diff -uNr linux-4.13.3/arch/arm/boot/dts/Makefile /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/boot/dts/Makefile
--- linux-4.13.3/arch/arm/boot/dts/Makefile	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/boot/dts/Makefile	2018-01-10 15:09:42.870310109 +0800
@@ -799,10 +799,8 @@
 	stih418-b2199.dtb
 dtb-$(CONFIG_ARCH_STM32)+= \
 	stm32f429-disco.dtb \
-	stm32f469-disco.dtb \
 	stm32f746-disco.dtb \
 	stm32f769-disco.dtb \
-	stm32429i-eval.dtb \
 	stm32746g-eval.dtb \
 	stm32h743i-eval.dtb \
 	stm32h743i-disco.dtb
diff -uNr linux-4.13.3/arch/arm/boot/dts/stm32f429-disco.dts /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/boot/dts/stm32f429-disco.dts
--- linux-4.13.3/arch/arm/boot/dts/stm32f429-disco.dts	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/boot/dts/stm32f429-disco.dts	2018-01-18 21:08:38.140268979 +0800
@@ -54,12 +54,14 @@
 	compatible = "st,stm32f429i-disco", "st,stm32f429";
 
 	chosen {
-		bootargs = "root=/dev/ram rdinit=/linuxrc";
+		//bootargs = "root=/dev/mtdblock2 rw rootfstype=yaffs2";
+		//bootargs = "root=/dev/nfs rw ip=192.168.2.123:192.168.2.1:::stm32:eth0:on nfsroot=192.168.2.202:/home/hyq/nfs";
+		bootargs = "root=/dev/nfs rw ip=dhcp nfsroot=192.168.2.202:/home/hyq/nfs";
 		stdout-path = "serial0:115200n8";
 	};
 
 	memory {
-		reg = <0x90000000 0x800000>;
+		reg = <0x80800000 0x03800000>;
 	};
 
 	aliases {
@@ -68,15 +70,24 @@
 
 	leds {
 		compatible = "gpio-leds";
-		red {
-			gpios = <&gpiog 14 0>;
+		d1 {
+			gpios = <&gpioi 6 0>;
 		};
-		green {
-			gpios = <&gpiog 13 0>;
+		d2 {
+			gpios = <&gpioi 7 0>;
+			linux,default-trigger = "heartbeat";
+		};
+		d3 {
+			gpios = <&gpioe 2 0>;
+			linux,default-trigger = "disk-activity";
+		};
+		d4 {
+			gpios = <&gpioe 3 0>;
 			linux,default-trigger = "heartbeat";
 		};
 	};
 
+	/*
 	gpio_keys {
 		compatible = "gpio-keys";
 		#address-cells = <1>;
@@ -88,18 +99,37 @@
 			gpios = <&gpioa 0 0>;
 		};
 	};
+	*/
 
-	/* This turns on vbus for otg for host mode (dwc2) */
+	/* This turns on vbus for otg for host mode (dwc2)
 	vcc5v_otg: vcc5v-otg-regulator {
 		compatible = "regulator-fixed";
 		gpio = <&gpioc 4 0>;
 		regulator-name = "vcc5_host1";
 		regulator-always-on;
+	}; */
+
+	panel_rgb: panel-rgb {
+		compatible = "edt,et057090dhu";
+		status = "okay";
+		port {
+			panel_in_rgb: endpoint {
+				remote-endpoint = <&ltdc_out_rgb>;
+			};
+		};
+	};
+
+	clocks {
+		clk_ext_camera: clk-ext-camera {
+			#clock-cells = <0>;
+			compatible = "fixed-clock";
+			clock-frequency = <25000000>;
+		};
 	};
 };
 
 &clk_hse {
-	clock-frequency = <8000000>;
+	clock-frequency = <25000000>;
 };
 
 &crc {
@@ -125,3 +155,77 @@
 	pinctrl-names = "default";
 	status = "okay";
 };
+
+&usbotg_fs {
+	compatible = "st,stm32f4x9-fsotg";
+	dr_mode = "host";
+	pinctrl-0 = <&usbotg_fs_pins_a>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&mac {
+	status = "okay";
+	pinctrl-0	= <&ethernet_rmii>;
+	pinctrl-names	= "default";
+	phy-mode	= "rmii";
+	snps,reset-gpio = <&gpioh 2 GPIO_ACTIVE_HIGH>;
+	snps,reset-active-low;
+	snps,reset-delays-us = <0 10000 100000>;
+};
+
+&ltdc {
+	status = "okay";
+	pinctrl-0 = <&ltdc_pins>;
+	pinctrl-names = "default";
+	dma-ranges;
+
+	port {
+		ltdc_out_rgb: endpoint {
+			remote-endpoint = <&panel_in_rgb>;
+		};
+	};
+};
+
+&sdio {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&sdio_pins>;
+	cd-gpio = <&gpioh 15 GPIO_ACTIVE_LOW>;
+};
+
+&dcmi {
+	status = "okay";
+
+	port {
+		dcmi_0: endpoint {
+			remote-endpoint = <&ov2640_0>;
+			bus-width = <8>;
+			hsync-active = <0>;
+			vsync-active = <0>;
+			pclk-sample = <1>;
+		};
+	};
+};
+
+&i2c1 {
+	pinctrl-0 = <&i2c1_pins>;
+	pinctrl-names = "default";
+	status = "okay";
+
+	ov2640: camera@30 {
+		compatible = "ovti,ov2640";
+		reg = <0x30>;
+		//resetb-gpios = <&gpiog 14 GPIO_ACTIVE_HIGH>;
+		//pwdn-gpios = <&gpiog 13 GPIO_ACTIVE_LOW>;
+		clocks = <&clk_ext_camera>;
+		clock-names = "xvclk";
+		status = "okay";
+
+		port {
+			ov2640_0: endpoint {
+				remote-endpoint = <&dcmi_0>;
+			};
+		};
+	};
+};
\ 文件尾没有 newline 字符
diff -uNr linux-4.13.3/arch/arm/boot/dts/stm32f429.dtsi /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/boot/dts/stm32f429.dtsi
--- linux-4.13.3/arch/arm/boot/dts/stm32f429.dtsi	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/boot/dts/stm32f429.dtsi	2018-01-10 15:09:42.838310980 +0800
@@ -50,6 +50,7 @@
 #include <dt-bindings/pinctrl/stm32f429-pinfunc.h>
 #include <dt-bindings/clock/stm32fx-clock.h>
 #include <dt-bindings/mfd/stm32f4-rcc.h>
+#include <dt-bindings/gpio/gpio.h>
 
 / {
 	clocks {
@@ -713,8 +714,7 @@
 
 			usbotg_fs_pins_a: usbotg_fs@0 {
 				pins {
-					pinmux = <STM32F429_PA10_FUNC_OTG_FS_ID>,
-						 <STM32F429_PA11_FUNC_OTG_FS_DM>,
+					pinmux = <STM32F429_PA11_FUNC_OTG_FS_DM>,
 						 <STM32F429_PA12_FUNC_OTG_FS_DP>;
 					bias-disable;
 					drive-push-pull;
@@ -724,8 +724,7 @@
 
 			usbotg_fs_pins_b: usbotg_fs@1 {
 				pins {
-					pinmux = <STM32F429_PB12_FUNC_OTG_HS_ID>,
-						 <STM32F429_PB14_FUNC_OTG_HS_DM>,
+					pinmux = <STM32F429_PB14_FUNC_OTG_HS_DM>,
 						 <STM32F429_PB15_FUNC_OTG_HS_DP>;
 					bias-disable;
 					drive-push-pull;
@@ -753,6 +752,7 @@
 				};
 			};
 
+			/*
 			ethernet_mii: mii@0 {
 				pins {
 					pinmux = <STM32F429_PG13_FUNC_ETH_MII_TXD0_ETH_RMII_TXD0>,
@@ -771,8 +771,36 @@
 						 <STM32F429_PH7_FUNC_ETH_MII_RXD3>;
 					slew-rate = <2>;
 				};
+			};*/
+
+			ethernet_rmii: rmii@0 {
+				pins {
+					pinmux = <STM32F429_PB12_FUNC_ETH_MII_TXD0_ETH_RMII_TXD0>,
+						 <STM32F429_PB13_FUNC_ETH_MII_TXD1_ETH_RMII_TXD1>,
+						 <STM32F429_PB11_FUNC_ETH_MII_TX_EN_ETH_RMII_TX_EN>,
+						 <STM32F429_PA2_FUNC_ETH_MDIO>,
+						 <STM32F429_PC1_FUNC_ETH_MDC>,
+						 <STM32F429_PA1_FUNC_ETH_MII_RX_CLK_ETH_RMII_REF_CLK>,
+						 <STM32F429_PA7_FUNC_ETH_MII_RX_DV_ETH_RMII_CRS_DV>,
+						 <STM32F429_PC4_FUNC_ETH_MII_RXD0_ETH_RMII_RXD0>,
+						 <STM32F429_PA8_FUNC_MCO1>,	// Use MCO as camera's clk
+						 <STM32F429_PC5_FUNC_ETH_MII_RXD1_ETH_RMII_RXD1>;
+					slew-rate = <3>;
+				};
 			};
 
+			i2c1_pins: i2c1@0 {
+				pins {
+					pinmux = 
+						 <STM32F429_PB7_FUNC_I2C1_SDA>,
+						 <STM32F429_PB6_FUNC_I2C1_SCL>;
+					bias-disable;
+					drive-open-drain;
+					slew-rate = <3>;
+				};
+			};
+
+			/*
 			adc3_in8_pin: adc@200 {
 				pins {
 					pinmux = <STM32F429_PF10_FUNC_ANALOG>;
@@ -794,16 +822,6 @@
 				};
 			};
 
-			i2c1_pins: i2c1@0 {
-				pins {
-					pinmux = <STM32F429_PB9_FUNC_I2C1_SDA>,
-						 <STM32F429_PB6_FUNC_I2C1_SCL>;
-					bias-disable;
-					drive-open-drain;
-					slew-rate = <3>;
-				};
-			};
-
 			ltdc_pins: ltdc@0 {
 				pins {
 					pinmux = <STM32F429_PI12_FUNC_LCD_HSYNC>,
@@ -836,25 +854,60 @@
 						 <STM32F429_PK7_FUNC_LCD_DE>;
 					slew-rate = <2>;
 				};
+			};*/
+
+			ltdc_pins: ltdc@0 {
+				pins {
+					pinmux = <STM32F429_PI10_FUNC_LCD_HSYNC>,
+						 <STM32F429_PI9_FUNC_LCD_VSYNC>,
+						 <STM32F429_PB0_FUNC_LCD_R3>,
+						 <STM32F429_PH10_FUNC_LCD_R4>,
+						 <STM32F429_PH11_FUNC_LCD_R5>,
+						 <STM32F429_PB1_FUNC_LCD_R6>,
+						 <STM32F429_PG6_FUNC_LCD_R7>,
+						 <STM32F429_PH13_FUNC_LCD_G2>,
+						 <STM32F429_PH14_FUNC_LCD_G3>,
+						 <STM32F429_PB10_FUNC_LCD_G4>,
+						 <STM32F429_PI0_FUNC_LCD_G5>,
+						 <STM32F429_PI1_FUNC_LCD_G6>,
+						 <STM32F429_PI2_FUNC_LCD_G7>,
+						 <STM32F429_PG11_FUNC_LCD_B3>,
+						 <STM32F429_PG12_FUNC_LCD_B4>,
+						 <STM32F429_PA3_FUNC_LCD_B5>,
+						 <STM32F429_PB8_FUNC_LCD_B6>,
+						 <STM32F429_PB9_FUNC_LCD_B7>;
+					slew-rate = <2>;
+				};
 			};
 
 			dcmi_pins: dcmi@0 {
 				pins {
-					pinmux = <STM32F429_PA4_FUNC_DCMI_HSYNC>,
-						 <STM32F429_PB7_FUNC_DCMI_VSYNC>,
+					pinmux = 
+						 <STM32F429_PH8_FUNC_DCMI_HSYNC>,
+						 <STM32F429_PI5_FUNC_DCMI_VSYNC>,
 						 <STM32F429_PA6_FUNC_DCMI_PIXCLK>,
-						 <STM32F429_PC6_FUNC_DCMI_D0>,
+						 <STM32F429_PH9_FUNC_DCMI_D0>,
 						 <STM32F429_PC7_FUNC_DCMI_D1>,
-						 <STM32F429_PC8_FUNC_DCMI_D2>,
-						 <STM32F429_PC9_FUNC_DCMI_D3>,
-						 <STM32F429_PC11_FUNC_DCMI_D4>,
+						 <STM32F429_PG10_FUNC_DCMI_D2>,
+						 <STM32F429_PH12_FUNC_DCMI_D3>,
+						 <STM32F429_PE4_FUNC_DCMI_D4>,
 						 <STM32F429_PD3_FUNC_DCMI_D5>,
-						 <STM32F429_PB8_FUNC_DCMI_D6>,
-						 <STM32F429_PE6_FUNC_DCMI_D7>,
-						 <STM32F429_PC10_FUNC_DCMI_D8>,
-						 <STM32F429_PC12_FUNC_DCMI_D9>,
-						 <STM32F429_PD6_FUNC_DCMI_D10>,
-						 <STM32F429_PD2_FUNC_DCMI_D11>;
+						 <STM32F429_PE5_FUNC_DCMI_D6>,
+						 <STM32F429_PE6_FUNC_DCMI_D7>;
+					bias-disable;
+					drive-push-pull;
+					slew-rate = <3>;
+				};
+			};
+
+			sdio_pins: sdio@0 {
+				pins {
+					pinmux = <STM32F429_PC8_FUNC_SDIO_D0>,
+							 <STM32F429_PC9_FUNC_SDIO_D1>,
+							 <STM32F429_PC10_FUNC_SDIO_D2>,
+							 <STM32F429_PC11_FUNC_SDIO_D3>,
+							 <STM32F429_PD2_FUNC_SDIO_CMD>,
+							 <STM32F429_PC12_FUNC_SDIO_CK>;
 					bias-disable;
 					drive-push-pull;
 					slew-rate = <3>;
@@ -915,6 +968,7 @@
 			compatible = "st,stm32-dwmac", "snps,dwmac-3.50a";
 			reg = <0x40028000 0x8000>;
 			reg-names = "stmmaceth";
+			mac-address = [C0 B1 3D 88 88 89];
 			interrupts = <61>;
 			interrupt-names = "macirq";
 			clock-names = "stmmaceth", "mac-clk-tx", "mac-clk-rx";
@@ -966,6 +1020,23 @@
 			clocks = <&rcc 0 STM32F4_AHB2_CLOCK(RNG)>;
 
 		};
+
+		sdio:sdi@40012C00 {
+			compatible = "arm,stm32f4", "arm,primecell";
+			reg = <0x40012C00 0x400>;
+			interrupts = <49>;
+			max-frequency = <25000000>;
+			bus-width = <4>;
+			voltage-ranges = <3200 3300 3300 3400>;
+			/* Use the same DMA both for rx and tx
+			dmas = <&dma2 3 4 0x400 0x0>, 
+			       <&dma2 3 4 0x400 0x0>;
+			dma-names = "rx", "tx"; */
+			clocks = <&rcc 0 171>;
+			clock-names = "apb_pclk";
+			arm,primecell-periphid = <0x40480180>;
+			status = "disabled";
+		};
 	};
 };
 
diff -uNr linux-4.13.3/arch/arm/include/asm/div64.h /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/include/asm/div64.h
--- linux-4.13.3/arch/arm/include/asm/div64.h	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/include/asm/div64.h	2018-01-10 15:09:42.958307713 +0800
@@ -35,13 +35,14 @@
 	register unsigned long long __n   asm("r0") = *n;
 	register unsigned long long __res asm("r2");
 	register unsigned int __rem       asm(__xh);
+	extern void __do_div64(void);
 	asm(	__asmeq("%0", __xh)
 		__asmeq("%1", "r2")
 		__asmeq("%2", "r0")
 		__asmeq("%3", "r4")
-		"bl	__do_div64"
+		"blx	%4"
 		: "=r" (__rem), "=r" (__res)
-		: "r" (__n), "r" (__base)
+		: "r" (__n), "r" (__base), "r" (__do_div64)
 		: "ip", "lr", "cc");
 	*n = __res;
 	return __rem;
diff -uNr linux-4.13.3/arch/arm/kernel/module.c /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/kernel/module.c
--- linux-4.13.3/arch/arm/kernel/module.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/kernel/module.c	2018-01-10 15:09:43.030305753 +0800
@@ -251,7 +251,7 @@
 
 			if (offset <= (s32)0xff000000 ||
 			    offset >= (s32)0x01000000) {
-				pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
+				pr_err("THUMB2 %s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
 				       module->name, relindex, i, symname,
 				       ELF32_R_TYPE(rel->r_info), loc,
 				       sym->st_value);
diff -uNr linux-4.13.3/arch/arm/mach-stm32/board-dt.c /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/mach-stm32/board-dt.c
--- linux-4.13.3/arch/arm/mach-stm32/board-dt.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/mach-stm32/board-dt.c	2018-01-10 15:09:43.426294973 +0800
@@ -7,6 +7,12 @@
 #include <linux/kernel.h>
 #include <asm/v7m.h>
 #include <asm/mach/arch.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/nand.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/physmap.h>
+#include <linux/platform_device.h>
 
 static const char *const stm32_compat[] __initconst = {
 	"st,stm32f429",
@@ -16,7 +22,107 @@
 	NULL
 };
 
+/*
+ * Test NAND flash platform device without devicetree...
+ */
+// basic MTD NAND operations
+#define FSMC_NAND_REG_DATA ((volatile uint8_t*)0x70000000)
+#define FSMC_NAND_REG_CMD  ((volatile uint8_t*)0x70010000)
+#define FSMC_NAND_REG_ADDR ((volatile uint8_t*)0x70020000)
+
+#define GPIOD_RCC ((volatile uint32_t*)0x40023830)
+#define GPIOD_IDR ((volatile uint32_t*)0x40020c10)
+
+static void fmc_send_cmd(struct mtd_info *mtd, int cmd, unsigned int ctrl)
+{
+	(void)mtd;
+
+	if(cmd != NAND_CMD_NONE)
+	{
+		if(ctrl & NAND_CLE){
+			//printf("nand cmd 0x%x\n", cmd);
+			*FSMC_NAND_REG_CMD = (uint8_t)cmd;
+		}
+		else if(ctrl & NAND_ALE){
+			//printf("nand addr 0x%x\n", cmd);
+			*FSMC_NAND_REG_ADDR = (uint8_t)cmd;
+		}
+	}
+}
+
+static int fmc_read_rb(struct mtd_info *mtd)
+{
+	(void)mtd;
+	// read PD6 for BUSY
+	*GPIOD_RCC |= 0x00000008;
+	return *GPIOD_IDR & (1L << 6);
+}
+
+/*
+ * NAND & platform device tables
+ */
+static struct mtd_partition stm32_nand_partitions[] = {
+	{
+		.name		= "first",
+		.offset		= 0,
+		.size		= 128 * 1024,
+		.mask_flags	= MTD_WRITEABLE,	/* force read-only */
+	},
+	{
+		.name		= "second",
+		.offset		= MTDPART_OFS_APPEND,
+		.size		= 256 * 1024,
+		.mask_flags	= MTD_WRITEABLE,	/* force read-only */
+	},
+	{
+		.name		= "rootfs",
+		.offset		= MTDPART_OFS_APPEND,
+		.size		= 120 * SZ_1M,
+	},
+};
+
+static struct platform_nand_data stm32_nand_platdata = {
+	.chip	= {
+		.nr_chips		= 1,
+		.chip_offset		= 0,
+		.nr_partitions		= ARRAY_SIZE(stm32_nand_partitions),
+		.partitions		= stm32_nand_partitions,
+		.options		= NAND_SAMSUNG_LP_OPTIONS,
+	},
+	.ctrl	= {
+		.cmd_ctrl	= fmc_send_cmd,
+		.dev_ready	= fmc_read_rb,
+	},
+};
+
+static struct resource stm32_nand_resource = {
+	.start = (resource_size_t)FSMC_NAND_REG_DATA,
+	.end   = (resource_size_t)FSMC_NAND_REG_DATA,
+	.flags		= IORESOURCE_MEM,
+};
+
+static struct platform_device stm32_nand_device = {
+	.name		= "gen_nand",
+	.id		= 0,
+	.dev		= {
+		.platform_data	= &stm32_nand_platdata,
+	},
+	.num_resources	= 1,
+	.resource	= &stm32_nand_resource,
+};
+
+static struct platform_device *stm32_devices[] __initdata = {
+	&stm32_nand_device,
+};
+
+static void __init board_stm32_ucpc_init(void)
+{
+	printk("STM32 UCPC: nand platform device");
+	platform_add_devices(stm32_devices, ARRAY_SIZE(stm32_devices));
+}
+
 DT_MACHINE_START(STM32DT, "STM32 (Device Tree Support)")
 	.dt_compat = stm32_compat,
 	.restart = armv7m_restart,
+	.init_machine = board_stm32_ucpc_init,
 MACHINE_END
diff -uNr linux-4.13.3/arch/arm/mach-stm32/Kconfig /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/mach-stm32/Kconfig
--- linux-4.13.3/arch/arm/mach-stm32/Kconfig	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/mach-stm32/Kconfig	2018-01-10 15:09:43.442294537 +0800
@@ -5,6 +5,7 @@
 	select ARMV7M_SYSTICK
 	select CLKSRC_STM32
 	select PINCTRL
+	select ARM_AMBA
 	select RESET_CONTROLLER
 	select STM32_EXTI
 	help
diff -uNr linux-4.13.3/arch/arm/Makefile /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/Makefile
--- linux-4.13.3/arch/arm/Makefile	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/arch/arm/Makefile	2018-01-20 15:12:26.683514967 +0800
@@ -120,7 +120,7 @@
 AFLAGS_ISA	:=$(CFLAGS_ISA) -Wa$(comma)-mthumb
 # Work around buggy relocation from gas if requested:
 ifeq ($(CONFIG_THUMB2_AVOID_R_ARM_THM_JUMP11),y)
-CFLAGS_MODULE	+=-fno-optimize-sibling-calls
+CFLAGS_MODULE	+=-fno-optimize-sibling-calls -mlong-calls
 endif
 else
 CFLAGS_ISA	:=$(call cc-option,-marm,)
diff -uNr linux-4.13.3/drivers/clk/clk-stm32f4.c /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/clk/clk-stm32f4.c
--- linux-4.13.3/drivers/clk/clk-stm32f4.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/clk/clk-stm32f4.c	2018-01-10 15:09:44.882255335 +0800
@@ -64,17 +64,28 @@
 };
 
 static const struct stm32f4_gate_data stm32f429_gates[] __initconst = {
-	{ STM32F4_RCC_AHB1ENR,  0,	"gpioa",	"ahb_div" },
-	{ STM32F4_RCC_AHB1ENR,  1,	"gpiob",	"ahb_div" },
-	{ STM32F4_RCC_AHB1ENR,  2,	"gpioc",	"ahb_div" },
-	{ STM32F4_RCC_AHB1ENR,  3,	"gpiod",	"ahb_div" },
-	{ STM32F4_RCC_AHB1ENR,  4,	"gpioe",	"ahb_div" },
-	{ STM32F4_RCC_AHB1ENR,  5,	"gpiof",	"ahb_div" },
-	{ STM32F4_RCC_AHB1ENR,  6,	"gpiog",	"ahb_div" },
-	{ STM32F4_RCC_AHB1ENR,  7,	"gpioh",	"ahb_div" },
-	{ STM32F4_RCC_AHB1ENR,  8,	"gpioi",	"ahb_div" },
-	{ STM32F4_RCC_AHB1ENR,  9,	"gpioj",	"ahb_div" },
-	{ STM32F4_RCC_AHB1ENR, 10,	"gpiok",	"ahb_div" },
+	{ STM32F4_RCC_AHB1ENR,  0,	"gpioa",	"ahb_div", 
+		CLK_IGNORE_UNUSED },
+	{ STM32F4_RCC_AHB1ENR,  1,	"gpiob",	"ahb_div", 
+		CLK_IGNORE_UNUSED },
+	{ STM32F4_RCC_AHB1ENR,  2,	"gpioc",	"ahb_div", 
+		CLK_IGNORE_UNUSED },
+	{ STM32F4_RCC_AHB1ENR,  3,	"gpiod",	"ahb_div", 
+		CLK_IGNORE_UNUSED },
+	{ STM32F4_RCC_AHB1ENR,  4,	"gpioe",	"ahb_div", 
+		CLK_IGNORE_UNUSED },
+	{ STM32F4_RCC_AHB1ENR,  5,	"gpiof",	"ahb_div", 
+		CLK_IGNORE_UNUSED },
+	{ STM32F4_RCC_AHB1ENR,  6,	"gpiog",	"ahb_div", 
+		CLK_IGNORE_UNUSED },
+	{ STM32F4_RCC_AHB1ENR,  7,	"gpioh",	"ahb_div", 
+		CLK_IGNORE_UNUSED },
+	{ STM32F4_RCC_AHB1ENR,  8,	"gpioi",	"ahb_div", 
+		CLK_IGNORE_UNUSED },
+	{ STM32F4_RCC_AHB1ENR,  9,	"gpioj",	"ahb_div", 
+		CLK_IGNORE_UNUSED },
+	{ STM32F4_RCC_AHB1ENR, 10,	"gpiok",	"ahb_div", 
+		CLK_IGNORE_UNUSED },
 	{ STM32F4_RCC_AHB1ENR, 12,	"crc",		"ahb_div" },
 	{ STM32F4_RCC_AHB1ENR, 18,	"bkpsra",	"ahb_div" },
 	{ STM32F4_RCC_AHB1ENR, 20,	"ccmdatam",	"ahb_div" },
@@ -133,14 +144,16 @@
 	{ STM32F4_RCC_APB2ENR, 11,	"sdio",		"pll48" },
 	{ STM32F4_RCC_APB2ENR, 12,	"spi1",		"apb2_div" },
 	{ STM32F4_RCC_APB2ENR, 13,	"spi4",		"apb2_div" },
-	{ STM32F4_RCC_APB2ENR, 14,	"syscfg",	"apb2_div" },
+	{ STM32F4_RCC_APB2ENR, 14,	"syscfg",	"apb2_div",
+		CLK_IGNORE_UNUSED },
 	{ STM32F4_RCC_APB2ENR, 16,	"tim9",		"apb2_mul" },
 	{ STM32F4_RCC_APB2ENR, 17,	"tim10",	"apb2_mul" },
 	{ STM32F4_RCC_APB2ENR, 18,	"tim11",	"apb2_mul" },
 	{ STM32F4_RCC_APB2ENR, 20,	"spi5",		"apb2_div" },
 	{ STM32F4_RCC_APB2ENR, 21,	"spi6",		"apb2_div" },
 	{ STM32F4_RCC_APB2ENR, 22,	"sai1",		"apb2_div" },
-	{ STM32F4_RCC_APB2ENR, 26,	"ltdc",		"apb2_div" },
+	{ STM32F4_RCC_APB2ENR, 26,	"ltdc",		"apb2_div",
+		CLK_IGNORE_UNUSED },
 };
 
 static const struct stm32f4_gate_data stm32f469_gates[] __initconst = {
@@ -1418,7 +1431,7 @@
 	int n;
 	const struct of_device_id *match;
 	const struct stm32f4_clk_data *data;
-	unsigned long pllcfgr;
+	unsigned long pllcfgr, cfgr;
 	const char *pllsrc;
 	unsigned long pllm;
 
@@ -1463,6 +1476,11 @@
 	pllsrc = pllcfgr & BIT(22) ? hse_clk : "hsi";
 	pllm = pllcfgr & 0x3f;
 
+	// enable MCO0, HSE no division output
+	cfgr = readl(base + STM32F4_RCC_CFGR);
+	cfgr |= 0x07400000;
+	writel(cfgr, base + STM32F4_RCC_CFGR);
+
 	clk_hw_register_fixed_factor(NULL, "vco_in", pllsrc,
 					       0, 1, pllm);
 
diff -uNr linux-4.13.3/drivers/dma/stm32-dma.c /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/dma/stm32-dma.c
--- linux-4.13.3/drivers/dma/stm32-dma.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/dma/stm32-dma.c	2018-01-10 15:09:45.318243466 +0800
@@ -707,7 +707,7 @@
 
 		nb_data_items = desc->sg_req[i].len / buswidth;
 		if (nb_data_items > STM32_DMA_MAX_DATA_ITEMS) {
-			dev_err(chan2dev(chan), "nb items not supported\n");
+			dev_err(chan2dev(chan), "%d items not supported\n", nb_data_items);
 			goto err;
 		}
 
diff -uNr linux-4.13.3/drivers/gpu/drm/panel/panel-simple.c /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/gpu/drm/panel/panel-simple.c
--- linux-4.13.3/drivers/gpu/drm/panel/panel-simple.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/gpu/drm/panel/panel-simple.c	2018-01-10 15:09:47.882173664 +0800
@@ -299,6 +299,8 @@
 	struct panel_simple *panel;
 	int err;
 
+	pr_info("%s", __func__);
+
 	panel = devm_kzalloc(dev, sizeof(*panel), GFP_KERNEL);
 	if (!panel)
 		return -ENOMEM;
@@ -834,15 +836,15 @@
 };
 
 static const struct drm_display_mode edt_et057090dhu_mode = {
-	.clock = 25175,
-	.hdisplay = 640,
-	.hsync_start = 640 + 16,
-	.hsync_end = 640 + 16 + 30,
-	.htotal = 640 + 16 + 30 + 114,
-	.vdisplay = 480,
-	.vsync_start = 480 + 10,
-	.vsync_end = 480 + 10 + 3,
-	.vtotal = 480 + 10 + 3 + 32,
+	.clock = 31468,
+	.hdisplay = 	640,
+	.hsync_start = 	640 + 16,
+	.hsync_end = 	640 + 16 + 96,
+	.htotal = 		640 + 16 + 96 + 48,
+	.vdisplay = 	480,
+	.vsync_start = 	480 + 10,
+	.vsync_end = 	480 + 10 + 2,
+	.vtotal = 		480 + 10 + 2 + 33,
 	.vrefresh = 60,
 	.flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
 };
diff -uNr linux-4.13.3/drivers/gpu/drm/stm/ltdc.c /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/gpu/drm/stm/ltdc.c
--- linux-4.13.3/drivers/gpu/drm/stm/ltdc.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/gpu/drm/stm/ltdc.c	2018-01-10 15:09:48.146166477 +0800
@@ -442,6 +442,7 @@
 	DRM_DEBUG_DRIVER(" hfp %d hbp %d hsl %d vfp %d vbp %d vsl %d\n",
 			 vm.hfront_porch, vm.hback_porch, vm.hsync_len,
 			 vm.vfront_porch, vm.vback_porch, vm.vsync_len);
+	DRM_DEBUG_DRIVER("rate %d", rate);
 
 	/* Convert video timings to ltdc timings */
 	hsync = vm.hsync_len - 1;
@@ -671,6 +672,9 @@
 
 	/* Sets the FB address */
 	paddr = (u32)drm_fb_cma_get_gem_addr(fb, state, 0);
+	/* LTDC does not recognize SDRAM relocation to 0 */
+	if (paddr < 0x08000000)
+		paddr |= 0x80000000;
 
 	DRM_DEBUG_DRIVER("fb: phys 0x%08x", paddr);
 	reg_write(ldev->regs, LTDC_L1CFBAR + lofs, paddr);
@@ -775,6 +779,7 @@
 	unsigned int i;
 	int res;
 
+	pr_info("%s, line %d", __func__, __LINE__);
 	primary = ltdc_plane_create(ddev, DRM_PLANE_TYPE_PRIMARY);
 	if (!primary) {
 		DRM_ERROR("Can not create primary plane\n");
@@ -788,6 +793,7 @@
 		goto cleanup;
 	}
 
+	pr_info("%s, line %d", __func__, __LINE__);
 	drm_crtc_helper_add(crtc, &ltdc_crtc_helper_funcs);
 
 	DRM_DEBUG_DRIVER("CRTC:%d created\n", crtc->base.id);
diff -uNr linux-4.13.3/drivers/mmc/core/sd.c /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/mmc/core/sd.c
--- linux-4.13.3/drivers/mmc/core/sd.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/mmc/core/sd.c	2018-01-10 15:09:50.410104559 +0800
@@ -1238,13 +1238,17 @@
 	 * Detect and init the card.
 	 */
 	err = mmc_sd_init_card(host, rocr, NULL);
-	if (err)
+	if (err){
+		pr_err("init card err");
 		goto err;
+	}
 
 	mmc_release_host(host);
 	err = mmc_add_card(host->card);
-	if (err)
+	if (err){
+		pr_err("add card err");
 		goto remove_card;
+	}
 
 	mmc_claim_host(host);
 	return 0;
diff -uNr linux-4.13.3/drivers/mmc/host/Makefile /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/mmc/host/Makefile
--- linux-4.13.3/drivers/mmc/host/Makefile	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/mmc/host/Makefile	2018-01-10 15:09:50.518101596 +0800
@@ -2,7 +2,11 @@
 # Makefile for MMC/SD host controller drivers
 #
 
+ifeq ($(CONFIG_ARCH_STM32),y)
+obj-$(CONFIG_MMC_ARMMMCI)	+= mmci_stm32f4.o
+else
 obj-$(CONFIG_MMC_ARMMMCI)	+= mmci.o
+endif
 obj-$(CONFIG_MMC_QCOM_DML)	+= mmci_qcom_dml.o
 obj-$(CONFIG_MMC_PXA)		+= pxamci.o
 obj-$(CONFIG_MMC_MXC)		+= mxcmmc.o
diff -uNr linux-4.13.3/drivers/mmc/host/mmci.c /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/mmc/host/mmci.c
--- linux-4.13.3/drivers/mmc/host/mmci.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/mmc/host/mmci.c	2018-01-10 15:09:50.446103571 +0800
@@ -216,6 +216,29 @@
 	.pwrreg_nopower		= true,
 };
 
+static struct variant_data variant_stm32f4 = {
+	.fifosize		= 32 * 4,
+	.fifohalfsize		= 8 * 4,
+	.clkreg			= MCI_CLK_ENABLE,
+	.clkreg_enable		= MCI_ST_UX500_HWFCEN,
+	.clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
+	.clkreg_neg_edge_enable	= MCI_ST_UX500_NEG_EDGE,
+	.datalength_bits	= 24,
+	.datactrl_mask_sdio	= MCI_DPSM_ST_SDIOEN,
+	.st_sdio		= true,
+	.st_clkdiv		= true,
+	.blksz_datactrl4 = true,
+	.pwrreg_powerup		= MCI_PWR_ON,
+	.f_max			= 100000000,
+	.signal_direction	= true,
+	.pwrreg_clkgate		= true,
+	.busy_detect		= true,
+	.busy_dpsm_flag		= MCI_DPSM_ST_BUSYMODE,
+	.busy_detect_flag	= MCI_ST_CARDBUSY,
+	.busy_detect_mask	= MCI_ST_BUSYENDMASK,
+	.pwrreg_nopower		= true,
+};
+
 static struct variant_data variant_qcom = {
 	.fifosize		= 16 * 4,
 	.fifohalfsize		= 8 * 4,
@@ -1662,7 +1685,7 @@
 		goto clk_disable;
 
 	if (!mmc->ocr_avail)
-		mmc->ocr_avail = plat->ocr_mask;
+		mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;//plat->ocr_mask;
 	else if (plat->ocr_mask)
 		dev_warn(mmc_dev(mmc), "Platform OCR mask is ignored\n");
 
@@ -1951,6 +1974,11 @@
 		.mask   = 0xf0ffffff,
 		.data	= &variant_ux500v2,
 	},
+	{
+		.id	= 0x40480180,	/* not 'official' value */
+		.mask	= 0xf0ffffff,
+		.data	= &variant_stm32f4,
+	},
 	/* Qualcomm variants */
 	{
 		.id     = 0x00051180,
diff -uNr linux-4.13.3/drivers/mmc/host/mmci_stm32f4.c /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/mmc/host/mmci_stm32f4.c
--- linux-4.13.3/drivers/mmc/host/mmci_stm32f4.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/mmc/host/mmci_stm32f4.c	2018-01-10 15:09:50.510101816 +0800
@@ -0,0 +1,1979 @@
+/*
+ *  linux/drivers/mmc/host/mmci.c - ARM PrimeCell MMCI PL180/1 driver
+ *
+ *  Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
+ *  Copyright (C) 2010 ST-Ericsson SA
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/init.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/highmem.h>
+#include <linux/log2.h>
+#include <linux/mmc/pm.h>
+#include <linux/mmc/host.h>
+#include <linux/mmc/card.h>
+#include <linux/mmc/slot-gpio.h>
+#include <linux/amba/bus.h>
+#include <linux/clk.h>
+#include <linux/scatterlist.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/regulator/consumer.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/amba/mmci.h>
+#include <linux/pm_runtime.h>
+#include <linux/types.h>
+#include <linux/pinctrl/consumer.h>
+
+#include <asm/div64.h>
+#include <asm/io.h>
+#include <asm/sizes.h>
+
+#include "mmci_stm32f4.h"
+#include "mmci_qcom_dml.h"
+
+#define DRIVER_NAME "mmci-pl18x"
+
+static unsigned int fmax = 515633;
+
+/**
+ * struct variant_data - MMCI variant-specific quirks
+ * @clkreg: default value for MCICLOCK register
+ * @clkreg_enable: enable value for MMCICLOCK register
+ * @clkreg_8bit_bus_enable: enable value for 8 bit bus
+ * @clkreg_neg_edge_enable: enable value for inverted data/cmd output
+ * @datalength_bits: number of bits in the MMCIDATALENGTH register
+ * @dma_max_req: if set, then override 'datalength_bits' maximum request size
+ * @fifosize: number of bytes that can be written when MMCI_TXFIFOEMPTY
+ *	      is asserted (likewise for RX)
+ * @fifohalfsize: number of bytes that can be written when MCI_TXFIFOHALFEMPTY
+ *		  is asserted (likewise for RX)
+ * @data_cmd_enable: enable value for data commands.
+ * @req_end_udelay: usec to insert before access MMCICMD reg upon req completion
+ * @st_sdio: enable ST specific SDIO logic
+ * @st_clkdiv: true if using a ST-specific clock divider algorithm
+ * @datactrl_mask_ddrmode: ddr mode mask in datactrl register.
+ * @blksz_datactrl16: true if Block size is at b16..b30 position in datactrl register
+ * @blksz_datactrl4: true if Block size is at b4..b16 position in datactrl
+ *		     register
+ * @datactrl_mask_sdio: SDIO enable mask in datactrl register
+ * @pwrreg_powerup: power up value for MMCIPOWER register
+ * @f_max: maximum clk frequency supported by the controller.
+ * @signal_direction: input/out direction of bus signals can be indicated
+ * @pwrreg_clkgate: MMCIPOWER register must be used to gate the clock
+ * @busy_detect: true if busy detection on dat0 is supported
+ * @pwrreg_nopower: bits in MMCIPOWER don't controls ext. power supply
+ * @explicit_mclk_control: enable explicit mclk control in driver.
+ * @qcom_fifo: enables qcom specific fifo pio read logic.
+ * @qcom_dml: enables qcom specific dma glue for dma transfers.
+ * @reversed_irq_handling: handle data irq before cmd irq.
+ * @flow_controller: true if can act as flow-controller in DMA transfers.
+ * @no_sgio: true if DMA doesn't support SGIO
+ * @no_dma_warns: true if DMA may produce (recoverable) errors during xfer.
+ */
+struct variant_data {
+	unsigned int		clkreg;
+	unsigned int		clkreg_enable;
+	unsigned int		clkreg_8bit_bus_enable;
+	unsigned int		clkreg_neg_edge_enable;
+	unsigned int		datalength_bits;
+	unsigned int		dma_max_req;
+	unsigned int		fifosize;
+	unsigned int		fifohalfsize;
+	unsigned int		data_cmd_enable;
+	unsigned int		datactrl_mask_ddrmode;
+	unsigned int		datactrl_mask_sdio;
+	unsigned int		req_end_udelay;
+	bool			st_sdio;
+	bool			st_clkdiv;
+	bool			blksz_datactrl16;
+	bool			blksz_datactrl4;
+	u32			pwrreg_powerup;
+	u32			f_max;
+	bool			signal_direction;
+	bool			pwrreg_clkgate;
+	bool			busy_detect;
+	bool			pwrreg_nopower;
+	bool			explicit_mclk_control;
+	bool			qcom_fifo;
+	bool			qcom_dml;
+	bool			reversed_irq_handling;
+	bool			flow_controller;
+	bool			no_sgio;
+	bool			no_dma_warns;
+};
+
+static struct variant_data variant_arm = {
+	.fifosize		= 16 * 4,
+	.fifohalfsize		= 8 * 4,
+	.datalength_bits	= 16,
+	.pwrreg_powerup		= MCI_PWR_UP,
+	.f_max			= 100000000,
+	.reversed_irq_handling	= true,
+};
+
+static struct variant_data variant_arm_extended_fifo = {
+	.fifosize		= 128 * 4,
+	.fifohalfsize		= 64 * 4,
+	.datalength_bits	= 16,
+	.pwrreg_powerup		= MCI_PWR_UP,
+	.f_max			= 100000000,
+};
+
+static struct variant_data variant_arm_extended_fifo_hwfc = {
+	.fifosize		= 128 * 4,
+	.fifohalfsize		= 64 * 4,
+	.clkreg_enable		= MCI_ARM_HWFCEN,
+	.datalength_bits	= 16,
+	.pwrreg_powerup		= MCI_PWR_UP,
+	.f_max			= 100000000,
+};
+
+static struct variant_data variant_u300 = {
+	.fifosize		= 16 * 4,
+	.fifohalfsize		= 8 * 4,
+	.clkreg_enable		= MCI_ST_U300_HWFCEN,
+	.clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
+	.datalength_bits	= 16,
+	.datactrl_mask_sdio	= MCI_ST_DPSM_SDIOEN,
+	.st_sdio			= true,
+	.pwrreg_powerup		= MCI_PWR_ON,
+	.f_max			= 100000000,
+	.signal_direction	= true,
+	.pwrreg_clkgate		= true,
+	.pwrreg_nopower		= true,
+};
+
+static struct variant_data variant_nomadik = {
+	.fifosize		= 16 * 4,
+	.fifohalfsize		= 8 * 4,
+	.clkreg			= MCI_CLK_ENABLE,
+	.datalength_bits	= 24,
+	.datactrl_mask_sdio	= MCI_ST_DPSM_SDIOEN,
+	.st_sdio		= true,
+	.st_clkdiv		= true,
+	.pwrreg_powerup		= MCI_PWR_ON,
+	.f_max			= 100000000,
+	.signal_direction	= true,
+	.pwrreg_clkgate		= true,
+	.pwrreg_nopower		= true,
+};
+
+static struct variant_data variant_ux500 = {
+	.fifosize		= 30 * 4,
+	.fifohalfsize		= 8 * 4,
+	.clkreg			= MCI_CLK_ENABLE,
+	.clkreg_enable		= MCI_ST_UX500_HWFCEN,
+	.clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
+	.clkreg_neg_edge_enable	= MCI_ST_UX500_NEG_EDGE,
+	.datalength_bits	= 24,
+	.datactrl_mask_sdio	= MCI_ST_DPSM_SDIOEN,
+	.st_sdio		= true,
+	.st_clkdiv		= true,
+	.pwrreg_powerup		= MCI_PWR_ON,
+	.f_max			= 100000000,
+	.signal_direction	= true,
+	.pwrreg_clkgate		= true,
+	.busy_detect		= true,
+	.pwrreg_nopower		= true,
+};
+
+static struct variant_data variant_ux500v2 = {
+	.fifosize		= 30 * 4,
+	.fifohalfsize		= 8 * 4,
+	.clkreg			= MCI_CLK_ENABLE,
+	.clkreg_enable		= MCI_ST_UX500_HWFCEN,
+	.clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
+	.clkreg_neg_edge_enable	= MCI_ST_UX500_NEG_EDGE,
+	.datactrl_mask_ddrmode	= MCI_ST_DPSM_DDRMODE,
+	.datalength_bits	= 24,
+	.datactrl_mask_sdio	= MCI_ST_DPSM_SDIOEN,
+	.st_sdio		= true,
+	.st_clkdiv		= true,
+	.blksz_datactrl16	= true,
+	.pwrreg_powerup		= MCI_PWR_ON,
+	.f_max			= 100000000,
+	.signal_direction	= true,
+	.pwrreg_clkgate		= true,
+	.busy_detect		= true,
+	.pwrreg_nopower		= true,
+};
+
+static struct variant_data variant_stm32f4 = {
+	.fifosize		= 32 * 4,
+	.fifohalfsize		= 8 * 4,
+	.clkreg			= MCI_CLK_ENABLE,
+	.clkreg_enable		= MCI_ST_UX500_HWFCEN | 0x00000010,
+	.clkreg_8bit_bus_enable = MCI_ST_8BIT_BUS,
+	.clkreg_neg_edge_enable	= MCI_ST_UX500_NEG_EDGE,
+	.datalength_bits	= 24,
+	.dma_max_req		= 262144, /* ((1 << 16) - 1) * 4 */
+	.datactrl_mask_sdio	= MCI_ST_DPSM_SDIOEN,
+	.req_end_udelay		= 1,
+	.st_sdio		= true,
+	.st_clkdiv		= true,
+	.pwrreg_powerup		= MCI_PWR_ON,
+	.f_max			= 100000000,
+	.signal_direction	= true,
+	.pwrreg_clkgate		= true,
+	.busy_detect		= false,
+	.pwrreg_nopower		= true,
+	.flow_controller	= true,
+	.no_sgio		= true,
+	.no_dma_warns		= true,
+};
+
+static struct variant_data variant_qcom = {
+	.fifosize		= 16 * 4,
+	.fifohalfsize		= 8 * 4,
+	.clkreg			= MCI_CLK_ENABLE,
+	.clkreg_enable		= MCI_QCOM_CLK_FLOWENA |
+				  MCI_QCOM_CLK_SELECT_IN_FBCLK,
+	.clkreg_8bit_bus_enable = MCI_QCOM_CLK_WIDEBUS_8,
+	.datactrl_mask_ddrmode	= MCI_QCOM_CLK_SELECT_IN_DDR_MODE,
+	.data_cmd_enable	= MCI_QCOM_CSPM_DATCMD,
+	.blksz_datactrl4	= true,
+	.datalength_bits	= 24,
+	.pwrreg_powerup		= MCI_PWR_UP,
+	.f_max			= 208000000,
+	.explicit_mclk_control	= true,
+	.qcom_fifo		= true,
+	.qcom_dml		= true,
+};
+
+static int mmci_card_busy(struct mmc_host *mmc)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	unsigned long flags;
+	int busy = 0;
+
+	pm_runtime_get_sync(mmc_dev(mmc));
+
+	spin_lock_irqsave(&host->lock, flags);
+	if (readl(host->base + MMCISTATUS) & MCI_ST_CARDBUSY)
+		busy = 1;
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	pm_runtime_mark_last_busy(mmc_dev(mmc));
+	pm_runtime_put_autosuspend(mmc_dev(mmc));
+
+	return busy;
+}
+
+/*
+ * Validate mmc prerequisites
+ */
+static int mmci_validate_data(struct mmci_host *host,
+			      struct mmc_data *data)
+{
+	if (!data)
+		return 0;
+
+	if (!is_power_of_2(data->blksz)) {
+		dev_err(mmc_dev(host->mmc),
+			"unsupported block size (%d bytes)\n", data->blksz);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void mmci_reg_delay(struct mmci_host *host)
+{
+	/*
+	 * According to the spec, at least three feedback clock cycles
+	 * of max 52 MHz must pass between two writes to the MMCICLOCK reg.
+	 * Three MCLK clock cycles must pass between two MMCIPOWER reg writes.
+	 * Worst delay time during card init is at 100 kHz => 30 us.
+	 * Worst delay time when up and running is at 25 MHz => 120 ns.
+	 */
+	if (host->cclk < 25000000)
+		udelay(30);
+	else
+		ndelay(120);
+}
+
+/*
+ * This must be called with host->lock held
+ */
+static void mmci_write_clkreg(struct mmci_host *host, u32 clk)
+{
+	if (host->clk_reg != clk) {
+		host->clk_reg = clk;
+		writel(clk, host->base + MMCICLOCK);
+	}
+}
+
+/*
+ * This must be called with host->lock held
+ */
+static void mmci_write_pwrreg(struct mmci_host *host, u32 pwr)
+{
+	if (host->pwr_reg != pwr) {
+		host->pwr_reg = pwr;
+		writel(pwr, host->base + MMCIPOWER);
+	}
+}
+
+/*
+ * This must be called with host->lock held
+ */
+static void mmci_write_datactrlreg(struct mmci_host *host, u32 datactrl)
+{
+	/* Keep ST Micro busy mode if enabled */
+	datactrl |= host->datactrl_reg & MCI_ST_DPSM_BUSYMODE;
+
+	if (host->datactrl_reg != datactrl) {
+		host->datactrl_reg = datactrl;
+		writel(datactrl, host->base + MMCIDATACTRL);
+	}
+}
+
+/*
+ * This must be called with host->lock held
+ */
+static void mmci_set_clkreg(struct mmci_host *host, unsigned int desired)
+{
+	struct variant_data *variant = host->variant;
+	u32 clk = variant->clkreg;
+
+	/* Make sure cclk reflects the current calculated clock */
+	host->cclk = 0;
+
+	if (desired) {
+		if (variant->explicit_mclk_control) {
+			host->cclk = host->mclk;
+		} else if (desired >= host->mclk) {
+			clk = MCI_CLK_BYPASS;
+			if (variant->st_clkdiv)
+				clk |= MCI_ST_UX500_NEG_EDGE;
+			host->cclk = host->mclk;
+		} else if (variant->st_clkdiv) {
+			/*
+			 * DB8500 TRM says f = mclk / (clkdiv + 2)
+			 * => clkdiv = (mclk / f) - 2
+			 * Round the divider up so we don't exceed the max
+			 * frequency
+			 */
+			clk = DIV_ROUND_UP(host->mclk, desired) - 2;
+			if (clk >= 256)
+				clk = 255;
+			host->cclk = host->mclk / (clk + 2);
+		} else {
+			/*
+			 * PL180 TRM says f = mclk / (2 * (clkdiv + 1))
+			 * => clkdiv = mclk / (2 * f) - 1
+			 */
+			clk = host->mclk / (2 * desired) - 1;
+			if (clk >= 256)
+				clk = 255;
+			host->cclk = host->mclk / (2 * (clk + 1));
+		}
+
+		clk |= variant->clkreg_enable;
+		clk |= MCI_CLK_ENABLE;
+		/* This hasn't proven to be worthwhile */
+		/* clk |= MCI_CLK_PWRSAVE; */
+	}
+
+	/* Set actual clock for debug */
+	host->mmc->actual_clock = host->cclk;
+
+	if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_4)
+		clk |= MCI_4BIT_BUS;
+	if (host->mmc->ios.bus_width == MMC_BUS_WIDTH_8)
+		clk |= variant->clkreg_8bit_bus_enable;
+
+	if (host->mmc->ios.timing == MMC_TIMING_UHS_DDR50 ||
+	    host->mmc->ios.timing == MMC_TIMING_MMC_DDR52)
+		clk |= variant->clkreg_neg_edge_enable;
+
+	mmci_write_clkreg(host, clk);
+}
+
+static void
+mmci_request_end(struct mmci_host *host, struct mmc_request *mrq)
+{
+	struct variant_data *variant = host->variant;
+
+	if (variant->req_end_udelay)
+		udelay(variant->req_end_udelay);
+
+	writel(0, host->base + MMCICOMMAND);
+
+	BUG_ON(host->data);
+
+	host->mrq = NULL;
+	host->cmd = NULL;
+
+	mmc_request_done(host->mmc, mrq);
+
+	pm_runtime_mark_last_busy(mmc_dev(host->mmc));
+	pm_runtime_put_autosuspend(mmc_dev(host->mmc));
+}
+
+static void mmci_set_mask1(struct mmci_host *host, unsigned int mask)
+{
+	void __iomem *base = host->base;
+
+	if (host->singleirq) {
+		unsigned int mask0 = readl(base + MMCIMASK0);
+
+		mask0 &= ~MCI_IRQ1MASK;
+		mask0 |= mask;
+
+		writel(mask0, base + MMCIMASK0);
+	}
+
+	writel(mask, base + MMCIMASK1);
+}
+
+static void mmci_stop_data(struct mmci_host *host)
+{
+	mmci_write_datactrlreg(host, 0);
+	mmci_set_mask1(host, 0);
+	host->data = NULL;
+}
+
+static void mmci_init_sg(struct mmci_host *host, struct mmc_data *data)
+{
+	unsigned int flags = SG_MITER_ATOMIC;
+
+	if (data->flags & MMC_DATA_READ)
+		flags |= SG_MITER_TO_SG;
+	else
+		flags |= SG_MITER_FROM_SG;
+
+	sg_miter_start(&host->sg_miter, data->sg, data->sg_len, flags);
+}
+
+/*
+ * All the DMA operation mode stuff goes inside this ifdef.
+ * This assumes that you have a generic DMA device interface,
+ * no custom DMA interfaces are supported.
+ */
+#ifdef CONFIG_DMA_ENGINE
+static void mmci_dma_setup(struct mmci_host *host)
+{
+	const char *rxname, *txname;
+	struct variant_data *variant = host->variant;
+
+	host->dma_rx_channel = dma_request_slave_channel(mmc_dev(host->mmc), "rx");
+	host->dma_tx_channel = dma_request_slave_channel(mmc_dev(host->mmc), "tx");
+
+	/* initialize pre request cookie */
+	host->next_data.cookie = 1;
+
+	/*
+	 * If only an RX channel is specified, the driver will
+	 * attempt to use it bidirectionally, however if it is
+	 * is specified but cannot be located, DMA will be disabled.
+	 */
+	if (host->dma_rx_channel && !host->dma_tx_channel)
+		host->dma_tx_channel = host->dma_rx_channel;
+
+	if (host->dma_rx_channel)
+		rxname = dma_chan_name(host->dma_rx_channel);
+	else
+		rxname = "none";
+
+	if (host->dma_tx_channel)
+		txname = dma_chan_name(host->dma_tx_channel);
+	else
+		txname = "none";
+
+	dev_info(mmc_dev(host->mmc), "DMA channels RX %s, TX %s\n",
+		 rxname, txname);
+
+	/*
+	 * Limit the maximum segment size in any SG entry according to
+	 * the parameters of the DMA engine device.
+	 */
+	if (host->dma_tx_channel) {
+		struct device *dev = host->dma_tx_channel->device->dev;
+		unsigned int max_seg_size = dma_get_max_seg_size(dev);
+
+		if (max_seg_size < host->mmc->max_seg_size)
+			host->mmc->max_seg_size = max_seg_size;
+	}
+	if (host->dma_rx_channel) {
+		struct device *dev = host->dma_rx_channel->device->dev;
+		unsigned int max_seg_size = dma_get_max_seg_size(dev);
+
+		if (max_seg_size < host->mmc->max_seg_size)
+			host->mmc->max_seg_size = max_seg_size;
+	}
+
+	if (variant->qcom_dml && host->dma_rx_channel && host->dma_tx_channel)
+		if (dml_hw_init(host, host->mmc->parent->of_node))
+			variant->qcom_dml = false;
+}
+
+/*
+ * This is used in or so inline it
+ * so it can be discarded.
+ */
+static inline void mmci_dma_release(struct mmci_host *host)
+{
+	if (host->dma_rx_channel)
+		dma_release_channel(host->dma_rx_channel);
+	if (host->dma_tx_channel)
+		dma_release_channel(host->dma_tx_channel);
+	host->dma_rx_channel = host->dma_tx_channel = NULL;
+}
+
+static void mmci_dma_data_error(struct mmci_host *host)
+{
+	struct variant_data *variant = host->variant;
+
+	if (likely(!variant->no_dma_warns))
+		dev_err(mmc_dev(host->mmc), "error during DMA transfer!\n");
+
+	dmaengine_terminate_all(host->dma_current);
+	host->dma_current = NULL;
+	host->dma_desc_current = NULL;
+	host->data->host_cookie = 0;
+}
+
+static void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
+{
+	struct dma_chan *chan;
+	enum dma_data_direction dir;
+
+	if (data->flags & MMC_DATA_READ) {
+		dir = DMA_FROM_DEVICE;
+		chan = host->dma_rx_channel;
+	} else {
+		dir = DMA_TO_DEVICE;
+		chan = host->dma_tx_channel;
+	}
+
+	dma_unmap_sg(chan->device->dev, data->sg, data->sg_len, dir);
+}
+
+static void mmci_dma_finalize(struct mmci_host *host, struct mmc_data *data)
+{
+	u32 status;
+	int i;
+
+	/* Wait up to 1ms for the DMA to complete */
+	for (i = 0; ; i++) {
+		status = readl(host->base + MMCISTATUS);
+		if (!(status & MCI_RXDATAAVLBLMASK) || i >= 100)
+			break;
+		udelay(10);
+	}
+
+	/*
+	 * Check to see whether we still have some data left in the FIFO -
+	 * this catches DMA controllers which are unable to monitor the
+	 * DMALBREQ and DMALSREQ signals while allowing us to DMA to non-
+	 * contiguous buffers.  On TX, we'll get a FIFO underrun error.
+	 */
+	if (status & MCI_RXDATAAVLBLMASK) {
+		mmci_dma_data_error(host);
+		if (!data->error)
+			data->error = -EIO;
+	}
+
+	if (!data->host_cookie)
+		mmci_dma_unmap(host, data);
+
+	/*
+	 * Use of DMA with scatter-gather is impossible.
+	 * Give up with DMA and switch back to PIO mode.
+	 */
+	if (status & MCI_RXDATAAVLBLMASK) {
+		dev_err(mmc_dev(host->mmc), "buggy DMA detected. Taking evasive action.\n");
+		mmci_dma_release(host);
+	}
+
+	host->dma_current = NULL;
+	host->dma_desc_current = NULL;
+}
+
+/* prepares DMA channel and DMA descriptor, returns non-zero on failure */
+static int __mmci_dma_prep_data(struct mmci_host *host, struct mmc_data *data,
+				struct dma_chan **dma_chan,
+				struct dma_async_tx_descriptor **dma_desc)
+{
+	struct variant_data *variant = host->variant;
+	struct dma_slave_config conf = {
+		.src_addr = host->phybase + MMCIFIFO,
+		.dst_addr = host->phybase + MMCIFIFO,
+		.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+		.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES,
+		.src_maxburst = variant->fifohalfsize >> 2, /* # of words */
+		.dst_maxburst = variant->fifohalfsize >> 2, /* # of words */
+		.device_fc = variant->flow_controller,
+	};
+	struct dma_chan *chan;
+	struct dma_device *device;
+	struct dma_async_tx_descriptor *desc;
+	enum dma_data_direction buffer_dirn;
+	int nr_sg;
+	unsigned long flags = DMA_CTRL_ACK;
+
+	if (data->flags & MMC_DATA_READ) {
+		conf.direction = DMA_DEV_TO_MEM;
+		buffer_dirn = DMA_FROM_DEVICE;
+		chan = host->dma_rx_channel;
+	} else {
+		conf.direction = DMA_MEM_TO_DEV;
+		buffer_dirn = DMA_TO_DEVICE;
+		chan = host->dma_tx_channel;
+	}
+
+	/* If there's no DMA channel, fall back to PIO */
+	if (!chan)
+		return -EINVAL;
+
+	/* If less than or equal to the fifo size, don't bother with DMA */
+	if (data->blksz * data->blocks <= variant->fifosize)
+		return -EINVAL;
+
+	device = chan->device;
+	nr_sg = dma_map_sg(device->dev, data->sg, data->sg_len, buffer_dirn);
+	if (nr_sg == 0)
+		return -EINVAL;
+
+	if (host->variant->qcom_dml)
+		flags |= DMA_PREP_INTERRUPT;
+
+	dmaengine_slave_config(chan, &conf);
+	desc = dmaengine_prep_slave_sg(chan, data->sg, nr_sg,
+					    conf.direction, flags);
+	if (!desc)
+		goto unmap_exit;
+
+	*dma_chan = chan;
+	*dma_desc = desc;
+
+	return 0;
+
+ unmap_exit:
+	dma_unmap_sg(device->dev, data->sg, data->sg_len, buffer_dirn);
+	return -ENOMEM;
+}
+
+static inline int mmci_dma_prep_data(struct mmci_host *host,
+				     struct mmc_data *data)
+{
+	/* Check if next job is already prepared. */
+	if (host->dma_current && host->dma_desc_current)
+		return 0;
+
+	/* No job were prepared thus do it now. */
+	return __mmci_dma_prep_data(host, data, &host->dma_current,
+				    &host->dma_desc_current);
+}
+
+static inline int mmci_dma_prep_next(struct mmci_host *host,
+				     struct mmc_data *data)
+{
+	struct mmci_host_next *nd = &host->next_data;
+	return __mmci_dma_prep_data(host, data, &nd->dma_chan, &nd->dma_desc);
+}
+
+static int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
+{
+	int ret;
+	struct mmc_data *data = host->data;
+
+	ret = mmci_dma_prep_data(host, host->data);
+	if (ret)
+		return ret;
+
+	/* Okay, go for it. */
+	dev_vdbg(mmc_dev(host->mmc),
+		 "Submit MMCI DMA job, sglen %d blksz %04x blks %04x flags %08x\n",
+		 data->sg_len, data->blksz, data->blocks, data->flags);
+	dmaengine_submit(host->dma_desc_current);
+	dma_async_issue_pending(host->dma_current);
+
+	if (host->variant->qcom_dml)
+		dml_start_xfer(host, data);
+
+	datactrl |= MCI_DPSM_DMAENABLE;
+
+	/* Trigger the DMA transfer */
+	mmci_write_datactrlreg(host, datactrl);
+
+	/*
+	 * Let the MMCI say when the data is ended and it's time
+	 * to fire next DMA request. When that happens, MMCI will
+	 * call mmci_data_end()
+	 */
+	writel(readl(host->base + MMCIMASK0) | MCI_DATAENDMASK,
+	       host->base + MMCIMASK0);
+	return 0;
+}
+
+static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data)
+{
+	struct mmci_host_next *next = &host->next_data;
+
+	WARN_ON(data->host_cookie && data->host_cookie != next->cookie);
+	WARN_ON(!data->host_cookie && (next->dma_desc || next->dma_chan));
+
+	host->dma_desc_current = next->dma_desc;
+	host->dma_current = next->dma_chan;
+	next->dma_desc = NULL;
+	next->dma_chan = NULL;
+}
+
+static void mmci_pre_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	struct mmc_data *data = mrq->data;
+	struct mmci_host_next *nd = &host->next_data;
+
+	if (!data)
+		return;
+
+	BUG_ON(data->host_cookie);
+
+	if (mmci_validate_data(host, data))
+		return;
+
+	if (!mmci_dma_prep_next(host, data))
+		data->host_cookie = ++nd->cookie < 0 ? 1 : nd->cookie;
+}
+
+static void mmci_post_request(struct mmc_host *mmc, struct mmc_request *mrq,
+			      int err)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	struct mmc_data *data = mrq->data;
+
+	if (!data || !data->host_cookie)
+		return;
+
+	mmci_dma_unmap(host, data);
+
+	if (err) {
+		struct mmci_host_next *next = &host->next_data;
+		struct dma_chan *chan;
+		if (data->flags & MMC_DATA_READ)
+			chan = host->dma_rx_channel;
+		else
+			chan = host->dma_tx_channel;
+		dmaengine_terminate_all(chan);
+
+		if (host->dma_desc_current == next->dma_desc)
+			host->dma_desc_current = NULL;
+
+		if (host->dma_current == next->dma_chan)
+			host->dma_current = NULL;
+
+		next->dma_desc = NULL;
+		next->dma_chan = NULL;
+		data->host_cookie = 0;
+	}
+}
+
+#else
+/* Blank functions if the DMA engine is not available */
+static void mmci_get_next_data(struct mmci_host *host, struct mmc_data *data)
+{
+}
+static inline void mmci_dma_setup(struct mmci_host *host)
+{
+}
+
+static inline void mmci_dma_release(struct mmci_host *host)
+{
+}
+
+static inline void mmci_dma_unmap(struct mmci_host *host, struct mmc_data *data)
+{
+}
+
+static inline void mmci_dma_finalize(struct mmci_host *host,
+				     struct mmc_data *data)
+{
+}
+
+static inline void mmci_dma_data_error(struct mmci_host *host)
+{
+}
+
+static inline int mmci_dma_start_data(struct mmci_host *host, unsigned int datactrl)
+{
+	return -ENOSYS;
+}
+
+#define mmci_pre_request NULL
+#define mmci_post_request NULL
+
+#endif
+
+static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
+{
+	struct variant_data *variant = host->variant;
+	unsigned int datactrl, timeout, irqmask;
+	unsigned long long clks;
+	void __iomem *base;
+	int blksz_bits;
+
+	dev_dbg(mmc_dev(host->mmc), "blksz %04x blks %04x flags %08x\n",
+		data->blksz, data->blocks, data->flags);
+
+	host->data = data;
+	host->size = data->blksz * data->blocks;
+	data->bytes_xfered = 0;
+
+	clks = (unsigned long long)data->timeout_ns * host->cclk;
+	do_div(clks, NSEC_PER_SEC);
+
+	timeout = data->timeout_clks + (unsigned int)clks;
+
+	base = host->base;
+	writel(timeout, base + MMCIDATATIMER);
+	writel(host->size, base + MMCIDATALENGTH);
+
+	blksz_bits = ffs(data->blksz) - 1;
+	BUG_ON(1 << blksz_bits != data->blksz);
+
+	if (variant->blksz_datactrl16)
+		datactrl = MCI_DPSM_ENABLE | (data->blksz << 16);
+	else if (variant->blksz_datactrl4)
+		datactrl = MCI_DPSM_ENABLE | (data->blksz << 4);
+	else
+		datactrl = MCI_DPSM_ENABLE | blksz_bits << 4;
+
+	if (data->flags & MMC_DATA_READ)
+		datactrl |= MCI_DPSM_DIRECTION;
+
+	if (host->mmc->card && mmc_card_sdio(host->mmc->card)) {
+		u32 clk;
+
+		datactrl |= variant->datactrl_mask_sdio;
+
+		/*
+		 * The ST Micro variant for SDIO small write transfers
+		 * needs to have clock H/W flow control disabled,
+		 * otherwise the transfer will not start. The threshold
+		 * depends on the rate of MCLK.
+		 */
+		if (variant->st_sdio && data->flags & MMC_DATA_WRITE &&
+		    (host->size < 8 ||
+		     (host->size <= 8 && host->mclk > 50000000)))
+			clk = host->clk_reg & ~variant->clkreg_enable;
+		else
+			clk = host->clk_reg | variant->clkreg_enable;
+
+		mmci_write_clkreg(host, clk);
+	}
+
+	if (host->mmc->ios.timing == MMC_TIMING_UHS_DDR50 ||
+	    host->mmc->ios.timing == MMC_TIMING_MMC_DDR52)
+		datactrl |= variant->datactrl_mask_ddrmode;
+
+	/*
+	 * Attempt to use DMA operation mode, if this
+	 * should fail, fall back to PIO mode
+	 */
+	if (!mmci_dma_start_data(host, datactrl))
+		return;
+
+	/* IRQ mode, map the SG list for CPU reading/writing */
+	mmci_init_sg(host, data);
+
+	if (data->flags & MMC_DATA_READ) {
+		irqmask = MCI_RXFIFOHALFFULLMASK;
+
+		/*
+		 * If we have less than the fifo 'half-full' threshold to
+		 * transfer, trigger a PIO interrupt as soon as any data
+		 * is available.
+		 */
+		if (host->size < variant->fifohalfsize)
+			irqmask |= MCI_RXDATAAVLBLMASK;
+	} else {
+		/*
+		 * We don't actually need to include "FIFO empty" here
+		 * since its implicit in "FIFO half empty".
+		 */
+		irqmask = MCI_TXFIFOHALFEMPTYMASK;
+	}
+
+	mmci_write_datactrlreg(host, datactrl);
+	writel(readl(base + MMCIMASK0) & ~MCI_DATAENDMASK, base + MMCIMASK0);
+	mmci_set_mask1(host, irqmask);
+}
+
+static void
+mmci_start_command(struct mmci_host *host, struct mmc_command *cmd, u32 c)
+{
+	void __iomem *base = host->base;
+
+	dev_dbg(mmc_dev(host->mmc), "op %02x arg %08x flags %08x\n",
+	    cmd->opcode, cmd->arg, cmd->flags);
+
+	if (readl(base + MMCICOMMAND) & MCI_CPSM_ENABLE) {
+		writel(0, base + MMCICOMMAND);
+		mmci_reg_delay(host);
+	}
+
+	c |= cmd->opcode | MCI_CPSM_ENABLE;
+	if (cmd->flags & MMC_RSP_PRESENT) {
+		if (cmd->flags & MMC_RSP_136)
+			c |= MCI_CPSM_LONGRSP;
+		c |= MCI_CPSM_RESPONSE;
+	}
+	if (/*interrupt*/0)
+		c |= MCI_CPSM_INTERRUPT;
+
+	if (mmc_cmd_type(cmd) == MMC_CMD_ADTC)
+		c |= host->variant->data_cmd_enable;
+	host->cmd = cmd;
+
+	writel(cmd->arg, base + MMCIARGUMENT);
+	writel(c, base + MMCICOMMAND);
+}
+
+static void
+mmci_data_irq(struct mmci_host *host, struct mmc_data *data,
+	      unsigned int status)
+{
+	/* Make sure we have data to handle */
+	if (!data)
+		return;
+
+	/* First check for errors */
+	if (status & (MCI_DATACRCFAIL|MCI_DATATIMEOUT|MCI_STARTBITERR|
+		      MCI_TXUNDERRUN|MCI_RXOVERRUN)) {
+		u32 remain, success;
+
+		/* Terminate the DMA transfer */
+		if (dma_inprogress(host)) {
+			mmci_dma_data_error(host);
+			mmci_dma_unmap(host, data);
+		}
+
+		/*
+		 * Calculate how far we are into the transfer.  Note that
+		 * the data counter gives the number of bytes transferred
+		 * on the MMC bus, not on the host side.  On reads, this
+		 * can be as much as a FIFO-worth of data ahead.  This
+		 * matters for FIFO overruns only.
+		 */
+		remain = readl(host->base + MMCIDATACNT);
+		success = data->blksz * data->blocks - remain;
+
+		dev_dbg(mmc_dev(host->mmc), "MCI ERROR IRQ, status 0x%08x at 0x%08x\n",
+			status, success);
+		if (status & MCI_DATACRCFAIL) {
+			/* Last block was not successful */
+			success -= 1;
+			data->error = -EILSEQ;
+		} else if (status & MCI_DATATIMEOUT) {
+			data->error = -ETIMEDOUT;
+		} else if (status & MCI_STARTBITERR) {
+			data->error = -ECOMM;
+		} else if (status & MCI_TXUNDERRUN) {
+			data->error = -EIO;
+		} else if (status & MCI_RXOVERRUN) {
+			if (success > host->variant->fifosize)
+				success -= host->variant->fifosize;
+			else
+				success = 0;
+			data->error = -EIO;
+		}
+		data->bytes_xfered = round_down(success, data->blksz);
+	}
+
+	if (status & MCI_DATABLOCKEND)
+		dev_err(mmc_dev(host->mmc), "stray MCI_DATABLOCKEND interrupt\n");
+
+	if (status & MCI_DATAEND || data->error) {
+		if (dma_inprogress(host))
+			mmci_dma_finalize(host, data);
+		mmci_stop_data(host);
+
+		if (!data->error)
+			/* The error clause is handled above, success! */
+			data->bytes_xfered = data->blksz * data->blocks;
+
+		if (!data->stop || host->mrq->sbc) {
+			mmci_request_end(host, data->mrq);
+		} else {
+			mmci_start_command(host, data->stop, 0);
+		}
+	}
+}
+
+static void
+mmci_cmd_irq(struct mmci_host *host, struct mmc_command *cmd,
+	     unsigned int status)
+{
+	void __iomem *base = host->base;
+	bool sbc, busy_resp;
+
+	if (!cmd)
+		return;
+
+	sbc = (cmd == host->mrq->sbc);
+	busy_resp = host->variant->busy_detect && (cmd->flags & MMC_RSP_BUSY);
+
+	if (!((status|host->busy_status) & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT|
+		MCI_CMDSENT|MCI_CMDRESPEND)))
+		return;
+
+	/* Check if we need to wait for busy completion. */
+	if (host->busy_status && (status & MCI_ST_CARDBUSY))
+		return;
+
+	/* Enable busy completion if needed and supported. */
+	if (!host->busy_status && busy_resp &&
+		!(status & (MCI_CMDCRCFAIL|MCI_CMDTIMEOUT)) &&
+		(readl(base + MMCISTATUS) & MCI_ST_CARDBUSY)) {
+		writel(readl(base + MMCIMASK0) | MCI_ST_BUSYEND,
+			base + MMCIMASK0);
+		host->busy_status = status & (MCI_CMDSENT|MCI_CMDRESPEND);
+		return;
+	}
+
+	/* At busy completion, mask the IRQ and complete the request. */
+	if (host->busy_status) {
+		writel(readl(base + MMCIMASK0) & ~MCI_ST_BUSYEND,
+			base + MMCIMASK0);
+		host->busy_status = 0;
+	}
+
+	host->cmd = NULL;
+
+	if (status & MCI_CMDTIMEOUT) {
+		cmd->error = -ETIMEDOUT;
+	} else if (status & MCI_CMDCRCFAIL && cmd->flags & MMC_RSP_CRC) {
+		cmd->error = -EILSEQ;
+	} else {
+		cmd->resp[0] = readl(base + MMCIRESPONSE0);
+		cmd->resp[1] = readl(base + MMCIRESPONSE1);
+		cmd->resp[2] = readl(base + MMCIRESPONSE2);
+		cmd->resp[3] = readl(base + MMCIRESPONSE3);
+	}
+
+	if ((!sbc && !cmd->data) || cmd->error) {
+		if (host->data) {
+			/* Terminate the DMA transfer */
+			if (dma_inprogress(host)) {
+				mmci_dma_data_error(host);
+				mmci_dma_unmap(host, host->data);
+			}
+			mmci_stop_data(host);
+		}
+		mmci_request_end(host, host->mrq);
+	} else if (sbc) {
+		mmci_start_command(host, host->mrq->cmd, 0);
+	} else if (!(cmd->data->flags & MMC_DATA_READ)) {
+		mmci_start_data(host, cmd->data);
+	}
+}
+
+static int mmci_get_rx_fifocnt(struct mmci_host *host, u32 status, int remain)
+{
+	return remain - (readl(host->base + MMCIFIFOCNT) << 2);
+}
+
+static int mmci_qcom_get_rx_fifocnt(struct mmci_host *host, u32 status, int r)
+{
+	/*
+	 * on qcom SDCC4 only 8 words are used in each burst so only 8 addresses
+	 * from the fifo range should be used
+	 */
+	if (status & MCI_RXFIFOHALFFULL)
+		return host->variant->fifohalfsize;
+	else if (status & MCI_RXDATAAVLBL)
+		return 4;
+
+	return 0;
+}
+
+static int mmci_pio_read(struct mmci_host *host, char *buffer, unsigned int remain)
+{
+	void __iomem *base = host->base;
+	char *ptr = buffer;
+	u32 status = readl(host->base + MMCISTATUS);
+	int host_remain = host->size;
+
+	do {
+		int count = host->get_rx_fifocnt(host, status, host_remain);
+
+		if (count > remain)
+			count = remain;
+
+		if (count <= 0)
+			break;
+
+		/*
+		 * SDIO especially may want to send something that is
+		 * not divisible by 4 (as opposed to card sectors
+		 * etc). Therefore make sure to always read the last bytes
+		 * while only doing full 32-bit reads towards the FIFO.
+		 */
+		if (unlikely(count & 0x3)) {
+			if (count < 4) {
+				unsigned char buf[4];
+				ioread32_rep(base + MMCIFIFO, buf, 1);
+				memcpy(ptr, buf, count);
+			} else {
+				ioread32_rep(base + MMCIFIFO, ptr, count >> 2);
+				count &= ~0x3;
+			}
+		} else {
+			ioread32_rep(base + MMCIFIFO, ptr, count >> 2);
+		}
+
+		ptr += count;
+		remain -= count;
+		host_remain -= count;
+
+		if (remain == 0)
+			break;
+
+		status = readl(base + MMCISTATUS);
+	} while (status & MCI_RXDATAAVLBL);
+
+	return ptr - buffer;
+}
+
+static int mmci_pio_write(struct mmci_host *host, char *buffer, unsigned int remain, u32 status)
+{
+	struct variant_data *variant = host->variant;
+	void __iomem *base = host->base;
+	char *ptr = buffer;
+
+	do {
+		unsigned int count, maxcnt;
+
+		maxcnt = status & MCI_TXFIFOEMPTY ?
+			 variant->fifosize : variant->fifohalfsize;
+		count = min(remain, maxcnt);
+
+		/*
+		 * SDIO especially may want to send something that is
+		 * not divisible by 4 (as opposed to card sectors
+		 * etc), and the FIFO only accept full 32-bit writes.
+		 * So compensate by adding +3 on the count, a single
+		 * byte become a 32bit write, 7 bytes will be two
+		 * 32bit writes etc.
+		 */
+		iowrite32_rep(base + MMCIFIFO, ptr, (count + 3) >> 2);
+
+		ptr += count;
+		remain -= count;
+
+		if (remain == 0)
+			break;
+
+		status = readl(base + MMCISTATUS);
+	} while (status & MCI_TXFIFOHALFEMPTY);
+
+	return ptr - buffer;
+}
+
+/*
+ * PIO data transfer IRQ handler.
+ */
+static irqreturn_t mmci_pio_irq(int irq, void *dev_id)
+{
+	struct mmci_host *host = dev_id;
+	struct sg_mapping_iter *sg_miter = &host->sg_miter;
+	struct variant_data *variant = host->variant;
+	void __iomem *base = host->base;
+	unsigned long flags;
+	u32 status;
+
+	status = readl(base + MMCISTATUS);
+
+	dev_dbg(mmc_dev(host->mmc), "irq1 (pio) %08x\n", status);
+
+	local_irq_save(flags);
+
+	do {
+		unsigned int remain, len;
+		char *buffer;
+
+		/*
+		 * For write, we only need to test the half-empty flag
+		 * here - if the FIFO is completely empty, then by
+		 * definition it is more than half empty.
+		 *
+		 * For read, check for data available.
+		 */
+		if (!(status & (MCI_TXFIFOHALFEMPTY|MCI_RXDATAAVLBL)))
+			break;
+
+		if (!sg_miter_next(sg_miter))
+			break;
+
+		buffer = sg_miter->addr;
+		remain = sg_miter->length;
+
+		len = 0;
+		if (status & MCI_RXACTIVE)
+			len = mmci_pio_read(host, buffer, remain);
+		if (status & MCI_TXACTIVE)
+			len = mmci_pio_write(host, buffer, remain, status);
+
+		sg_miter->consumed = len;
+
+		host->size -= len;
+		remain -= len;
+
+		if (remain)
+			break;
+
+		status = readl(base + MMCISTATUS);
+	} while (1);
+
+	sg_miter_stop(sg_miter);
+
+	local_irq_restore(flags);
+
+	/*
+	 * If we have less than the fifo 'half-full' threshold to transfer,
+	 * trigger a PIO interrupt as soon as any data is available.
+	 */
+	if (status & MCI_RXACTIVE && host->size < variant->fifohalfsize)
+		mmci_set_mask1(host, MCI_RXDATAAVLBLMASK);
+
+	/*
+	 * If we run out of data, disable the data IRQs; this
+	 * prevents a race where the FIFO becomes empty before
+	 * the chip itself has disabled the data path, and
+	 * stops us racing with our data end IRQ.
+	 */
+	if (host->size == 0) {
+		mmci_set_mask1(host, 0);
+		writel(readl(base + MMCIMASK0) | MCI_DATAENDMASK, base + MMCIMASK0);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * Handle completion of command and data transfers.
+ */
+static irqreturn_t mmci_irq(int irq, void *dev_id)
+{
+	struct mmci_host *host = dev_id;
+	u32 status;
+	int ret = 0;
+
+	spin_lock(&host->lock);
+
+	do {
+		status = readl(host->base + MMCISTATUS);
+
+		if (host->singleirq) {
+			if (status &
+			    (readl(host->base + MMCIMASK0) & MCI_IRQ1MASK)) {
+				mmci_pio_irq(irq, dev_id);
+			}
+
+			status &= ~MCI_IRQ1MASK;
+		}
+
+		/*
+		 * We intentionally clear the MCI_ST_CARDBUSY IRQ here (if it's
+		 * enabled) since the HW seems to be triggering the IRQ on both
+		 * edges while monitoring DAT0 for busy completion.
+		 */
+		status &= readl(host->base + MMCIMASK0);
+		writel(status, host->base + MMCICLEAR);
+
+		dev_dbg(mmc_dev(host->mmc), "irq0 (data+cmd) %08x\n", status);
+
+		if (host->variant->reversed_irq_handling) {
+			mmci_data_irq(host, host->data, status);
+			mmci_cmd_irq(host, host->cmd, status);
+		} else {
+			mmci_cmd_irq(host, host->cmd, status);
+			mmci_data_irq(host, host->data, status);
+		}
+
+		/* Don't poll for busy completion in irq context. */
+		if (host->busy_status)
+			status &= ~MCI_ST_CARDBUSY;
+
+		ret = 1;
+	} while (status);
+
+	spin_unlock(&host->lock);
+
+	return IRQ_RETVAL(ret);
+}
+
+static void mmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	unsigned long flags;
+
+	WARN_ON(host->mrq != NULL);
+
+	mrq->cmd->error = mmci_validate_data(host, mrq->data);
+	if (mrq->cmd->error) {
+		mmc_request_done(mmc, mrq);
+		return;
+	}
+
+	pm_runtime_get_sync(mmc_dev(mmc));
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	host->mrq = mrq;
+
+	if (mrq->data)
+		mmci_get_next_data(host, mrq->data);
+
+	if (mrq->data && mrq->data->flags & MMC_DATA_READ)
+		mmci_start_data(host, mrq->data);
+
+	if (mrq->sbc)
+		mmci_start_command(host, mrq->sbc, 0);
+	else
+		mmci_start_command(host, mrq->cmd, 0);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static void mmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	struct variant_data *variant = host->variant;
+	u32 pwr = 0;
+	unsigned long flags;
+	int ret;
+
+	pm_runtime_get_sync(mmc_dev(mmc));
+
+	if (host->plat->ios_handler &&
+		host->plat->ios_handler(mmc_dev(mmc), ios))
+			dev_err(mmc_dev(mmc), "platform ios_handler failed\n");
+
+	switch (ios->power_mode) {
+	case MMC_POWER_OFF:
+		if (!IS_ERR(mmc->supply.vmmc))
+			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
+
+		if (!IS_ERR(mmc->supply.vqmmc) && host->vqmmc_enabled) {
+			regulator_disable(mmc->supply.vqmmc);
+			host->vqmmc_enabled = false;
+		}
+
+		break;
+	case MMC_POWER_UP:
+		if (!IS_ERR(mmc->supply.vmmc))
+			mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
+
+		/*
+		 * The ST Micro variant doesn't have the PL180s MCI_PWR_UP
+		 * and instead uses MCI_PWR_ON so apply whatever value is
+		 * configured in the variant data.
+		 */
+		pwr |= variant->pwrreg_powerup;
+
+		break;
+	case MMC_POWER_ON:
+		if (!IS_ERR(mmc->supply.vqmmc) && !host->vqmmc_enabled) {
+			ret = regulator_enable(mmc->supply.vqmmc);
+			if (ret < 0)
+				dev_err(mmc_dev(mmc),
+					"failed to enable vqmmc regulator\n");
+			else
+				host->vqmmc_enabled = true;
+		}
+
+		pwr |= MCI_PWR_ON;
+		break;
+	}
+
+	if (variant->signal_direction && ios->power_mode != MMC_POWER_OFF) {
+		/*
+		 * The ST Micro variant has some additional bits
+		 * indicating signal direction for the signals in
+		 * the SD/MMC bus and feedback-clock usage.
+		 */
+		pwr |= host->pwr_reg_add;
+
+		if (ios->bus_width == MMC_BUS_WIDTH_4)
+			pwr &= ~MCI_ST_DATA74DIREN;
+		else if (ios->bus_width == MMC_BUS_WIDTH_1)
+			pwr &= (~MCI_ST_DATA74DIREN &
+				~MCI_ST_DATA31DIREN &
+				~MCI_ST_DATA2DIREN);
+	}
+
+	if (ios->bus_mode == MMC_BUSMODE_OPENDRAIN) {
+		if (host->hw_designer != AMBA_VENDOR_ST)
+			pwr |= MCI_ROD;
+		else {
+			/*
+			 * The ST Micro variant use the ROD bit for something
+			 * else and only has OD (Open Drain).
+			 */
+			pwr |= MCI_OD;
+		}
+	}
+
+	/*
+	 * If clock = 0 and the variant requires the MMCIPOWER to be used for
+	 * gating the clock, the MCI_PWR_ON bit is cleared.
+	 */
+	if (!ios->clock && variant->pwrreg_clkgate)
+		pwr &= ~MCI_PWR_ON;
+
+	if (host->variant->explicit_mclk_control &&
+	    ios->clock != host->clock_cache) {
+		ret = clk_set_rate(host->clk, ios->clock);
+		if (ret < 0)
+			dev_err(mmc_dev(host->mmc),
+				"Error setting clock rate (%d)\n", ret);
+		else
+			host->mclk = clk_get_rate(host->clk);
+	}
+	host->clock_cache = ios->clock;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	mmci_set_clkreg(host, ios->clock);
+	mmci_write_pwrreg(host, pwr);
+	mmci_reg_delay(host);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+
+	pm_runtime_mark_last_busy(mmc_dev(mmc));
+	pm_runtime_put_autosuspend(mmc_dev(mmc));
+}
+
+static int mmci_get_cd(struct mmc_host *mmc)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	struct mmci_platform_data *plat = host->plat;
+	unsigned int status = mmc_gpio_get_cd(mmc);
+
+	if (status == -ENOSYS) {
+		if (!plat->status)
+			return 1; /* Assume always present */
+
+		status = plat->status(mmc_dev(host->mmc));
+	}
+	return status;
+}
+
+static int mmci_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	int ret = 0;
+
+	if (!IS_ERR(mmc->supply.vqmmc)) {
+
+		pm_runtime_get_sync(mmc_dev(mmc));
+
+		switch (ios->signal_voltage) {
+		case MMC_SIGNAL_VOLTAGE_330:
+			ret = regulator_set_voltage(mmc->supply.vqmmc,
+						2700000, 3600000);
+			break;
+		case MMC_SIGNAL_VOLTAGE_180:
+			ret = regulator_set_voltage(mmc->supply.vqmmc,
+						1700000, 1950000);
+			break;
+		case MMC_SIGNAL_VOLTAGE_120:
+			ret = regulator_set_voltage(mmc->supply.vqmmc,
+						1100000, 1300000);
+			break;
+		}
+
+		if (ret)
+			dev_warn(mmc_dev(mmc), "Voltage switch failed\n");
+
+		pm_runtime_mark_last_busy(mmc_dev(mmc));
+		pm_runtime_put_autosuspend(mmc_dev(mmc));
+	}
+
+	return ret;
+}
+
+static struct mmc_host_ops mmci_ops = {
+	.request	= mmci_request,
+	.pre_req	= mmci_pre_request,
+	.post_req	= mmci_post_request,
+	.set_ios	= mmci_set_ios,
+	.get_ro		= mmc_gpio_get_ro,
+	.get_cd		= mmci_get_cd,
+	.start_signal_voltage_switch = mmci_sig_volt_switch,
+};
+
+static int mmci_of_parse(struct device_node *np, struct mmc_host *mmc)
+{
+	struct mmci_host *host = mmc_priv(mmc);
+	int ret = mmc_of_parse(mmc);
+
+	if (ret)
+		return ret;
+
+	if (of_get_property(np, "st,sig-dir-dat0", NULL))
+		host->pwr_reg_add |= MCI_ST_DATA0DIREN;
+	if (of_get_property(np, "st,sig-dir-dat2", NULL))
+		host->pwr_reg_add |= MCI_ST_DATA2DIREN;
+	if (of_get_property(np, "st,sig-dir-dat31", NULL))
+		host->pwr_reg_add |= MCI_ST_DATA31DIREN;
+	if (of_get_property(np, "st,sig-dir-dat74", NULL))
+		host->pwr_reg_add |= MCI_ST_DATA74DIREN;
+	if (of_get_property(np, "st,sig-dir-cmd", NULL))
+		host->pwr_reg_add |= MCI_ST_CMDDIREN;
+	if (of_get_property(np, "st,sig-pin-fbclk", NULL))
+		host->pwr_reg_add |= MCI_ST_FBCLKEN;
+
+	if (of_get_property(np, "mmc-cap-mmc-highspeed", NULL))
+		mmc->caps |= MMC_CAP_MMC_HIGHSPEED;
+	if (of_get_property(np, "mmc-cap-sd-highspeed", NULL))
+		mmc->caps |= MMC_CAP_SD_HIGHSPEED;
+
+	return 0;
+}
+
+static int mmci_probe(struct amba_device *dev,
+	const struct amba_id *id)
+{
+	struct mmci_platform_data *plat = dev->dev.platform_data;
+	struct device_node *np = dev->dev.of_node;
+	struct variant_data *variant = id->data;
+	struct mmci_host *host;
+	struct mmc_host *mmc;
+	int ret;
+
+	/* Must have platform data or Device Tree. */
+	if (!plat && !np) {
+		dev_err(&dev->dev, "No plat data or DT found\n");
+		return -EINVAL;
+	}
+
+	if (!plat) {
+		plat = devm_kzalloc(&dev->dev, sizeof(*plat), GFP_KERNEL);
+		if (!plat)
+			return -ENOMEM;
+	}
+
+	mmc = mmc_alloc_host(sizeof(struct mmci_host), &dev->dev);
+	if (!mmc)
+		return -ENOMEM;
+
+	ret = mmci_of_parse(np, mmc);
+	if (ret)
+		goto host_free;
+
+	host = mmc_priv(mmc);
+	host->mmc = mmc;
+
+	host->hw_designer = amba_manf(dev);
+	host->hw_revision = amba_rev(dev);
+	dev_dbg(mmc_dev(mmc), "designer ID = 0x%02x\n", host->hw_designer);
+	dev_dbg(mmc_dev(mmc), "revision = 0x%01x\n", host->hw_revision);
+
+	host->clk = devm_clk_get(&dev->dev, NULL);
+	if (IS_ERR(host->clk)) {
+		ret = PTR_ERR(host->clk);
+		goto host_free;
+	}
+
+	ret = clk_prepare_enable(host->clk);
+	if (ret)
+		goto host_free;
+
+	if (variant->qcom_fifo)
+		host->get_rx_fifocnt = mmci_qcom_get_rx_fifocnt;
+	else
+		host->get_rx_fifocnt = mmci_get_rx_fifocnt;
+
+	host->plat = plat;
+	host->variant = variant;
+	host->mclk = clk_get_rate(host->clk);
+	/*
+	 * According to the spec, mclk is max 100 MHz,
+	 * so we try to adjust the clock down to this,
+	 * (if possible).
+	 */
+	if (host->mclk > variant->f_max) {
+		ret = clk_set_rate(host->clk, variant->f_max);
+		if (ret < 0)
+			goto clk_disable;
+		host->mclk = clk_get_rate(host->clk);
+		dev_dbg(mmc_dev(mmc), "eventual mclk rate: %u Hz\n",
+			host->mclk);
+	}
+
+	host->phybase = dev->res.start;
+	host->base = devm_ioremap_resource(&dev->dev, &dev->res);
+	if (IS_ERR(host->base)) {
+		ret = PTR_ERR(host->base);
+		goto clk_disable;
+	}
+
+	/*
+	 * The ARM and ST versions of the block have slightly different
+	 * clock divider equations which means that the minimum divider
+	 * differs too.
+	 * on Qualcomm like controllers get the nearest minimum clock to 100Khz
+	 */
+	if (variant->st_clkdiv)
+		mmc->f_min = DIV_ROUND_UP(host->mclk, 257);
+	else if (variant->explicit_mclk_control)
+		mmc->f_min = clk_round_rate(host->clk, 100000);
+	else
+		mmc->f_min = DIV_ROUND_UP(host->mclk, 512);
+	/*
+	 * If no maximum operating frequency is supplied, fall back to use
+	 * the module parameter, which has a (low) default value in case it
+	 * is not specified. Either value must not exceed the clock rate into
+	 * the block, of course.
+	 */
+	if (mmc->f_max)
+		mmc->f_max = variant->explicit_mclk_control ?
+				min(variant->f_max, mmc->f_max) :
+				min(host->mclk, mmc->f_max);
+	else
+		mmc->f_max = variant->explicit_mclk_control ?
+				fmax : min(host->mclk, fmax);
+
+
+	dev_dbg(mmc_dev(mmc), "clocking block at %u Hz\n", mmc->f_max);
+
+	/* Get regulators and the supported OCR mask */
+	ret = mmc_regulator_get_supply(mmc);
+	if (ret == -EPROBE_DEFER)
+		goto clk_disable;
+
+	if (!mmc->ocr_avail){
+		mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;//plat->ocr_mask;
+	}
+	else if (plat->ocr_mask)
+		dev_warn(mmc_dev(mmc), "Platform OCR mask is ignored\n");
+
+	/* DT takes precedence over platform data. */
+	if (!np) {
+		if (!plat->cd_invert)
+			mmc->caps2 |= MMC_CAP2_CD_ACTIVE_HIGH;
+		mmc->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
+	}
+
+	/* We support these capabilities. */
+	mmc->caps |= MMC_CAP_CMD23;
+
+	if (variant->busy_detect) {
+		mmci_ops.card_busy = mmci_card_busy;
+		mmci_write_datactrlreg(host, MCI_ST_DPSM_BUSYMODE);
+		mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY;
+		mmc->max_busy_timeout = 0;
+	}
+
+	mmc->ops = &mmci_ops;
+
+	/* We support these PM capabilities. */
+	mmc->pm_caps |= MMC_PM_KEEP_POWER;
+
+	/*
+	 * If can do SGIO
+	 */
+	mmc->max_segs = !variant->no_sgio ? NR_SG : 1;
+
+	/*
+	 * Since only a certain number of bits are valid in the data length
+	 * register, we must ensure that we don't exceed 2^num-1 bytes in a
+	 * single request.
+	 */
+	if (unlikely(variant->dma_max_req))
+		mmc->max_req_size = variant->dma_max_req;
+	else
+		mmc->max_req_size = (1 << variant->datalength_bits) - 1;
+
+	/*
+	 * Set the maximum segment size.  Since we aren't doing DMA
+	 * (yet) we are only limited by the data length register.
+	 */
+	mmc->max_seg_size = mmc->max_req_size;
+
+	/*
+	 * Block size can be up to 2048 bytes, but must be a power of two.
+	 */
+	mmc->max_blk_size = 1 << 11;
+
+	/*
+	 * Limit the number of blocks transferred so that we don't overflow
+	 * the maximum request size.
+	 */
+	mmc->max_blk_count = mmc->max_req_size >> 11;
+
+	spin_lock_init(&host->lock);
+
+	writel(0, host->base + MMCIMASK0);
+	writel(0, host->base + MMCIMASK1);
+	writel(0xfff, host->base + MMCICLEAR);
+
+	/*
+	 * If:
+	 * - not using DT but using a descriptor table, or
+	 * - using a table of descriptors ALONGSIDE DT, or
+	 * look up these descriptors named "cd" and "wp" right here, fail
+	 * silently of these do not exist and proceed to try platform data
+	 */
+	if (!np) {
+		ret = mmc_gpiod_request_cd(mmc, "cd", 0, false, 0, NULL);
+		if (ret < 0) {
+			if (ret == -EPROBE_DEFER)
+				goto clk_disable;
+			else if (gpio_is_valid(plat->gpio_cd)) {
+				ret = mmc_gpio_request_cd(mmc, plat->gpio_cd, 0);
+				if (ret)
+					goto clk_disable;
+			}
+		}
+
+		ret = mmc_gpiod_request_ro(mmc, "wp", 0, false, 0, NULL);
+		if (ret < 0) {
+			if (ret == -EPROBE_DEFER)
+				goto clk_disable;
+			else if (gpio_is_valid(plat->gpio_wp)) {
+				ret = mmc_gpio_request_ro(mmc, plat->gpio_wp);
+				if (ret)
+					goto clk_disable;
+			}
+		}
+	}
+
+	ret = devm_request_irq(&dev->dev, dev->irq[0], mmci_irq, IRQF_SHARED,
+			DRIVER_NAME " (cmd)", host);
+	if (ret)
+		goto clk_disable;
+
+	if (!dev->irq[1])
+		host->singleirq = true;
+	else {
+		ret = devm_request_irq(&dev->dev, dev->irq[1], mmci_pio_irq,
+				IRQF_SHARED, DRIVER_NAME " (pio)", host);
+		if (ret)
+			goto clk_disable;
+	}
+
+	writel(MCI_IRQENABLE, host->base + MMCIMASK0);
+
+	amba_set_drvdata(dev, mmc);
+
+	dev_info(&dev->dev, "%s: PL%03x manf %x rev%u at 0x%08llx irq %d,%d (pio)\n",
+		 mmc_hostname(mmc), amba_part(dev), amba_manf(dev),
+		 amba_rev(dev), (unsigned long long)dev->res.start,
+		 dev->irq[0], dev->irq[1]);
+
+	mmci_dma_setup(host);
+
+	pm_runtime_set_autosuspend_delay(&dev->dev, 50);
+	pm_runtime_use_autosuspend(&dev->dev);
+
+	mmc_add_host(mmc);
+
+	pm_runtime_put(&dev->dev);
+	return 0;
+
+ clk_disable:
+	clk_disable_unprepare(host->clk);
+ host_free:
+	mmc_free_host(mmc);
+	return ret;
+}
+
+static int mmci_remove(struct amba_device *dev)
+{
+	struct mmc_host *mmc = amba_get_drvdata(dev);
+
+	if (mmc) {
+		struct mmci_host *host = mmc_priv(mmc);
+
+		/*
+		 * Undo pm_runtime_put() in probe.  We use the _sync
+		 * version here so that we can access the primecell.
+		 */
+		pm_runtime_get_sync(&dev->dev);
+
+		mmc_remove_host(mmc);
+
+		writel(0, host->base + MMCIMASK0);
+		writel(0, host->base + MMCIMASK1);
+
+		writel(0, host->base + MMCICOMMAND);
+		writel(0, host->base + MMCIDATACTRL);
+
+		mmci_dma_release(host);
+		clk_disable_unprepare(host->clk);
+		mmc_free_host(mmc);
+	}
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static void mmci_save(struct mmci_host *host)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	writel(0, host->base + MMCIMASK0);
+	if (host->variant->pwrreg_nopower) {
+		writel(0, host->base + MMCIDATACTRL);
+		writel(0, host->base + MMCIPOWER);
+		writel(0, host->base + MMCICLOCK);
+	}
+	mmci_reg_delay(host);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static void mmci_restore(struct mmci_host *host)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&host->lock, flags);
+
+	if (host->variant->pwrreg_nopower) {
+		writel(host->clk_reg, host->base + MMCICLOCK);
+		writel(host->datactrl_reg, host->base + MMCIDATACTRL);
+		writel(host->pwr_reg, host->base + MMCIPOWER);
+	}
+	writel(MCI_IRQENABLE, host->base + MMCIMASK0);
+	mmci_reg_delay(host);
+
+	spin_unlock_irqrestore(&host->lock, flags);
+}
+
+static int mmci_runtime_suspend(struct device *dev)
+{
+	struct amba_device *adev = to_amba_device(dev);
+	struct mmc_host *mmc = amba_get_drvdata(adev);
+
+	if (mmc) {
+		struct mmci_host *host = mmc_priv(mmc);
+		pinctrl_pm_select_sleep_state(dev);
+		mmci_save(host);
+		clk_disable_unprepare(host->clk);
+	}
+
+	return 0;
+}
+
+static int mmci_runtime_resume(struct device *dev)
+{
+	struct amba_device *adev = to_amba_device(dev);
+	struct mmc_host *mmc = amba_get_drvdata(adev);
+
+	if (mmc) {
+		struct mmci_host *host = mmc_priv(mmc);
+		clk_prepare_enable(host->clk);
+		mmci_restore(host);
+		pinctrl_pm_select_default_state(dev);
+	}
+
+	return 0;
+}
+#endif
+
+static const struct dev_pm_ops mmci_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
+	SET_RUNTIME_PM_OPS(mmci_runtime_suspend, mmci_runtime_resume, NULL)
+};
+
+static struct amba_id mmci_ids[] = {
+	{
+		.id	= 0x00041180,
+		.mask	= 0xff0fffff,
+		.data	= &variant_arm,
+	},
+	{
+		.id	= 0x01041180,
+		.mask	= 0xff0fffff,
+		.data	= &variant_arm_extended_fifo,
+	},
+	{
+		.id	= 0x02041180,
+		.mask	= 0xff0fffff,
+		.data	= &variant_arm_extended_fifo_hwfc,
+	},
+	{
+		.id	= 0x00041181,
+		.mask	= 0x000fffff,
+		.data	= &variant_arm,
+	},
+	/* ST Micro variants */
+	{
+		.id     = 0x00180180,
+		.mask   = 0x00ffffff,
+		.data	= &variant_u300,
+	},
+	{
+		.id     = 0x10180180,
+		.mask   = 0xf0ffffff,
+		.data	= &variant_nomadik,
+	},
+	{
+		.id     = 0x00280180,
+		.mask   = 0x00ffffff,
+		.data	= &variant_u300,
+	},
+	{
+		.id     = 0x00480180,
+		.mask   = 0xf0ffffff,
+		.data	= &variant_ux500,
+	},
+	{
+		.id     = 0x10480180,
+		.mask   = 0xf0ffffff,
+		.data	= &variant_ux500v2,
+	},
+	{
+		.id	= 0x40480180,	/* not 'official' value */
+		.mask	= 0xf0ffffff,
+		.data	= &variant_stm32f4,
+	},
+	/* Qualcomm variants */
+	{
+		.id     = 0x00051180,
+		.mask	= 0x000fffff,
+		.data	= &variant_qcom,
+	},
+	{ 0, 0 },
+};
+
+MODULE_DEVICE_TABLE(amba, mmci_ids);
+
+static struct amba_driver mmci_driver = {
+	.drv		= {
+		.name	= DRIVER_NAME,
+		.pm	= &mmci_dev_pm_ops,
+	},
+	.probe		= mmci_probe,
+	.remove		= mmci_remove,
+	.id_table	= mmci_ids,
+};
+
+module_amba_driver(mmci_driver);
+
+module_param(fmax, uint, 0444);
+
+MODULE_DESCRIPTION("ARM PrimeCell PL180/181 Multimedia Card Interface driver");
+MODULE_LICENSE("GPL");
diff -uNr linux-4.13.3/drivers/mmc/host/mmci_stm32f4.h /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/mmc/host/mmci_stm32f4.h
--- linux-4.13.3/drivers/mmc/host/mmci_stm32f4.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/mmc/host/mmci_stm32f4.h	2018-01-10 15:09:50.438103791 +0800
@@ -0,0 +1,247 @@
+/*
+ *  linux/drivers/mmc/host/mmci.h - ARM PrimeCell MMCI PL180/1 driver
+ *
+ *  Copyright (C) 2003 Deep Blue Solutions, Ltd, All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#define MMCIPOWER		0x000
+#define MCI_PWR_OFF		0x00
+#define MCI_PWR_UP		0x02
+#define MCI_PWR_ON		0x03
+#define MCI_OD			(1 << 6)
+#define MCI_ROD			(1 << 7)
+/*
+ * The ST Micro version does not have ROD and reuse the voltage registers for
+ * direction settings.
+ */
+#define MCI_ST_DATA2DIREN	(1 << 2)
+#define MCI_ST_CMDDIREN		(1 << 3)
+#define MCI_ST_DATA0DIREN	(1 << 4)
+#define MCI_ST_DATA31DIREN	(1 << 5)
+#define MCI_ST_FBCLKEN		(1 << 7)
+#define MCI_ST_DATA74DIREN	(1 << 8)
+
+#define MMCICLOCK		0x004
+#define MCI_CLK_ENABLE		(1 << 8)
+#define MCI_CLK_PWRSAVE		(1 << 9)
+#define MCI_CLK_BYPASS		(1 << 10)
+#define MCI_4BIT_BUS		(1 << 11)
+/*
+ * 8bit wide buses, hardware flow contronl, negative edges and clock inversion
+ * supported in ST Micro U300 and Ux500 versions
+ */
+#define MCI_ST_8BIT_BUS		(1 << 12)
+#define MCI_ST_U300_HWFCEN	(1 << 13)
+#define MCI_ST_UX500_NEG_EDGE	(1 << 13)
+#define MCI_ST_UX500_HWFCEN	(1 << 14)
+#define MCI_ST_UX500_CLK_INV	(1 << 15)
+/* Modified PL180 on Versatile Express platform */
+#define MCI_ARM_HWFCEN		(1 << 12)
+
+/* Modified on Qualcomm Integrations */
+#define MCI_QCOM_CLK_WIDEBUS_8	(BIT(10) | BIT(11))
+#define MCI_QCOM_CLK_FLOWENA	BIT(12)
+#define MCI_QCOM_CLK_INVERTOUT	BIT(13)
+
+/* select in latch data and command in */
+#define MCI_QCOM_CLK_SELECT_IN_FBCLK	BIT(15)
+#define MCI_QCOM_CLK_SELECT_IN_DDR_MODE	(BIT(14) | BIT(15))
+
+#define MMCIARGUMENT		0x008
+#define MMCICOMMAND		0x00c
+#define MCI_CPSM_RESPONSE	(1 << 6)
+#define MCI_CPSM_LONGRSP	(1 << 7)
+#define MCI_CPSM_INTERRUPT	(1 << 8)
+#define MCI_CPSM_PENDING	(1 << 9)
+#define MCI_CPSM_ENABLE		(1 << 10)
+/* Argument flag extenstions in the ST Micro versions */
+#define MCI_ST_SDIO_SUSP	(1 << 11)
+#define MCI_ST_ENCMD_COMPL	(1 << 12)
+#define MCI_ST_NIEN		(1 << 13)
+#define MCI_ST_CE_ATACMD	(1 << 14)
+
+/* Modified on Qualcomm Integrations */
+#define MCI_QCOM_CSPM_DATCMD		BIT(12)
+#define MCI_QCOM_CSPM_MCIABORT		BIT(13)
+#define MCI_QCOM_CSPM_CCSENABLE		BIT(14)
+#define MCI_QCOM_CSPM_CCSDISABLE	BIT(15)
+#define MCI_QCOM_CSPM_AUTO_CMD19	BIT(16)
+#define MCI_QCOM_CSPM_AUTO_CMD21	BIT(21)
+
+#define MMCIRESPCMD		0x010
+#define MMCIRESPONSE0		0x014
+#define MMCIRESPONSE1		0x018
+#define MMCIRESPONSE2		0x01c
+#define MMCIRESPONSE3		0x020
+#define MMCIDATATIMER		0x024
+#define MMCIDATALENGTH		0x028
+#define MMCIDATACTRL		0x02c
+#define MCI_DPSM_ENABLE		(1 << 0)
+#define MCI_DPSM_DIRECTION	(1 << 1)
+#define MCI_DPSM_MODE		(1 << 2)
+#define MCI_DPSM_DMAENABLE	(1 << 3)
+#define MCI_DPSM_BLOCKSIZE	(1 << 4)
+/* Control register extensions in the ST Micro U300 and Ux500 versions */
+#define MCI_ST_DPSM_RWSTART	(1 << 8)
+#define MCI_ST_DPSM_RWSTOP	(1 << 9)
+#define MCI_ST_DPSM_RWMOD	(1 << 10)
+#define MCI_ST_DPSM_SDIOEN	(1 << 11)
+/* Control register extensions in the ST Micro Ux500 versions */
+#define MCI_ST_DPSM_DMAREQCTL	(1 << 12)
+#define MCI_ST_DPSM_DBOOTMODEEN	(1 << 13)
+#define MCI_ST_DPSM_BUSYMODE	(1 << 14)
+#define MCI_ST_DPSM_DDRMODE	(1 << 15)
+
+#define MMCIDATACNT		0x030
+#define MMCISTATUS		0x034
+#define MCI_CMDCRCFAIL		(1 << 0)
+#define MCI_DATACRCFAIL		(1 << 1)
+#define MCI_CMDTIMEOUT		(1 << 2)
+#define MCI_DATATIMEOUT		(1 << 3)
+#define MCI_TXUNDERRUN		(1 << 4)
+#define MCI_RXOVERRUN		(1 << 5)
+#define MCI_CMDRESPEND		(1 << 6)
+#define MCI_CMDSENT		(1 << 7)
+#define MCI_DATAEND		(1 << 8)
+#define MCI_STARTBITERR		(1 << 9)
+#define MCI_DATABLOCKEND	(1 << 10)
+#define MCI_CMDACTIVE		(1 << 11)
+#define MCI_TXACTIVE		(1 << 12)
+#define MCI_RXACTIVE		(1 << 13)
+#define MCI_TXFIFOHALFEMPTY	(1 << 14)
+#define MCI_RXFIFOHALFFULL	(1 << 15)
+#define MCI_TXFIFOFULL		(1 << 16)
+#define MCI_RXFIFOFULL		(1 << 17)
+#define MCI_TXFIFOEMPTY		(1 << 18)
+#define MCI_RXFIFOEMPTY		(1 << 19)
+#define MCI_TXDATAAVLBL		(1 << 20)
+#define MCI_RXDATAAVLBL		(1 << 21)
+/* Extended status bits for the ST Micro variants */
+#define MCI_ST_SDIOIT		(1 << 22)
+#define MCI_ST_CEATAEND		(1 << 23)
+#define MCI_ST_CARDBUSY		(1 << 24)
+
+#define MMCICLEAR		0x038
+#define MCI_CMDCRCFAILCLR	(1 << 0)
+#define MCI_DATACRCFAILCLR	(1 << 1)
+#define MCI_CMDTIMEOUTCLR	(1 << 2)
+#define MCI_DATATIMEOUTCLR	(1 << 3)
+#define MCI_TXUNDERRUNCLR	(1 << 4)
+#define MCI_RXOVERRUNCLR	(1 << 5)
+#define MCI_CMDRESPENDCLR	(1 << 6)
+#define MCI_CMDSENTCLR		(1 << 7)
+#define MCI_DATAENDCLR		(1 << 8)
+#define MCI_STARTBITERRCLR	(1 << 9)
+#define MCI_DATABLOCKENDCLR	(1 << 10)
+/* Extended status bits for the ST Micro variants */
+#define MCI_ST_SDIOITC		(1 << 22)
+#define MCI_ST_CEATAENDC	(1 << 23)
+#define MCI_ST_BUSYENDC		(1 << 24)
+
+#define MMCIMASK0		0x03c
+#define MCI_CMDCRCFAILMASK	(1 << 0)
+#define MCI_DATACRCFAILMASK	(1 << 1)
+#define MCI_CMDTIMEOUTMASK	(1 << 2)
+#define MCI_DATATIMEOUTMASK	(1 << 3)
+#define MCI_TXUNDERRUNMASK	(1 << 4)
+#define MCI_RXOVERRUNMASK	(1 << 5)
+#define MCI_CMDRESPENDMASK	(1 << 6)
+#define MCI_CMDSENTMASK		(1 << 7)
+#define MCI_DATAENDMASK		(1 << 8)
+#define MCI_STARTBITERRMASK	(1 << 9)
+#define MCI_DATABLOCKENDMASK	(1 << 10)
+#define MCI_CMDACTIVEMASK	(1 << 11)
+#define MCI_TXACTIVEMASK	(1 << 12)
+#define MCI_RXACTIVEMASK	(1 << 13)
+#define MCI_TXFIFOHALFEMPTYMASK	(1 << 14)
+#define MCI_RXFIFOHALFFULLMASK	(1 << 15)
+#define MCI_TXFIFOFULLMASK	(1 << 16)
+#define MCI_RXFIFOFULLMASK	(1 << 17)
+#define MCI_TXFIFOEMPTYMASK	(1 << 18)
+#define MCI_RXFIFOEMPTYMASK	(1 << 19)
+#define MCI_TXDATAAVLBLMASK	(1 << 20)
+#define MCI_RXDATAAVLBLMASK	(1 << 21)
+/* Extended status bits for the ST Micro variants */
+#define MCI_ST_SDIOITMASK	(1 << 22)
+#define MCI_ST_CEATAENDMASK	(1 << 23)
+#define MCI_ST_BUSYEND		(1 << 24)
+
+#define MMCIMASK1		0x040
+#define MMCIFIFOCNT		0x048
+#define MMCIFIFO		0x080 /* to 0x0bc */
+
+#define MCI_IRQENABLE	\
+	(MCI_CMDCRCFAILMASK|MCI_DATACRCFAILMASK|MCI_CMDTIMEOUTMASK|	\
+	MCI_DATATIMEOUTMASK|MCI_TXUNDERRUNMASK|MCI_RXOVERRUNMASK|	\
+	MCI_CMDRESPENDMASK|MCI_CMDSENTMASK|MCI_STARTBITERRMASK)
+
+/* These interrupts are directed to IRQ1 when two IRQ lines are available */
+#define MCI_IRQ1MASK \
+	(MCI_RXFIFOHALFFULLMASK | MCI_RXDATAAVLBLMASK | \
+	 MCI_TXFIFOHALFEMPTYMASK)
+
+#define NR_SG		128
+
+struct clk;
+struct variant_data;
+struct dma_chan;
+
+struct mmci_host_next {
+	struct dma_async_tx_descriptor	*dma_desc;
+	struct dma_chan			*dma_chan;
+	s32				cookie;
+};
+
+struct mmci_host {
+	phys_addr_t		phybase;
+	void __iomem		*base;
+	struct mmc_request	*mrq;
+	struct mmc_command	*cmd;
+	struct mmc_data		*data;
+	struct mmc_host		*mmc;
+	struct clk		*clk;
+	bool			singleirq;
+
+	spinlock_t		lock;
+
+	unsigned int		mclk;
+	/* cached value of requested clk in set_ios */
+	unsigned int		clock_cache;
+	unsigned int		cclk;
+	u32			pwr_reg;
+	u32			pwr_reg_add;
+	u32			clk_reg;
+	u32			datactrl_reg;
+	u32			busy_status;
+	bool			vqmmc_enabled;
+	struct mmci_platform_data *plat;
+	struct variant_data	*variant;
+
+	u8			hw_designer;
+	u8			hw_revision:4;
+
+	struct timer_list	timer;
+	unsigned int		oldstat;
+
+	/* pio stuff */
+	struct sg_mapping_iter	sg_miter;
+	unsigned int		size;
+	int (*get_rx_fifocnt)(struct mmci_host *h, u32 status, int remain);
+
+#ifdef CONFIG_DMA_ENGINE
+	/* DMA stuff */
+	struct dma_chan		*dma_current;
+	struct dma_chan		*dma_rx_channel;
+	struct dma_chan		*dma_tx_channel;
+	struct dma_async_tx_descriptor	*dma_desc_current;
+	struct mmci_host_next	next_data;
+
+#define dma_inprogress(host)	((host)->dma_current)
+#else
+#define dma_inprogress(host)	(0)
+#endif
+};
+
diff -uNr linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c
--- linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/dwmac_lib.c	2018-01-10 15:09:51.422076803 +0800
@@ -26,8 +26,8 @@
 int dwmac_dma_reset(void __iomem *ioaddr)
 {
 	u32 value = readl(ioaddr + DMA_BUS_MODE);
-	int err;
-
+	int err = 0;
+	
 	/* DMA SW reset */
 	value |= DMA_BUS_MODE_SFT_RESET;
 	writel(value, ioaddr + DMA_BUS_MODE);
diff -uNr linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
--- linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c	2018-01-10 15:09:51.394077571 +0800
@@ -39,7 +39,7 @@
 	u32 val;
 	int ret;
 
-	val = (plat_dat->interface == PHY_INTERFACE_MODE_MII) ? 0 : 1;
+	val = (plat_dat->interface == PHY_INTERFACE_MODE_MII) ? 0 : MII_PHY_SEL_MASK;
 	ret = regmap_update_bits(dwmac->regmap, reg, MII_PHY_SEL_MASK, val);
 	if (ret)
 		return ret;
diff -uNr linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
--- linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c	2018-01-10 15:09:51.434076474 +0800
@@ -2136,7 +2136,6 @@
 		dev_err(priv->device, "Failed to reset the dma\n");
 		return ret;
 	}
-
 	if (priv->synopsys_id >= DWMAC_CORE_4_00) {
 		/* DMA Configuration */
 		priv->hw->dma->init(priv->ioaddr, priv->plat->dma_cfg,
diff -uNr linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c
--- linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/net/ethernet/stmicro/stmmac/stmmac_mdio.c	2018-01-10 15:09:51.454075925 +0800
@@ -286,7 +286,7 @@
 			irq_str = irq_num;
 			break;
 		}
-		phy_attached_info(phydev);
+		//phy_attached_info(phydev);
 		found = 1;
 	}
 
diff -uNr linux-4.13.3/drivers/of/platform.c /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/of/platform.c
--- linux-4.13.3/drivers/of/platform.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/of/platform.c	2018-01-10 15:09:52.458048389 +0800
@@ -228,7 +228,7 @@
 	const void *prop;
 	int i, ret;
 
-	pr_debug("Creating amba device %s\n", node->full_name);
+	pr_info("Creating amba device %s\n", node->full_name);
 
 	if (!of_device_is_available(node) ||
 	    of_node_test_and_set_flag(node, OF_POPULATED))
@@ -285,6 +285,7 @@
 						 void *platform_data,
 						 struct device *parent)
 {
+	pr_info("No arm abma");
 	return NULL;
 }
 #endif /* CONFIG_ARM_AMBA */
@@ -378,6 +379,7 @@
 		 * Don't return an error here to keep compatibility with older
 		 * device tree files.
 		 */
+		pr_info("sdio...");
 		of_amba_device_create(bus, bus_id, platform_data, parent);
 		return 0;
 	}
diff -uNr linux-4.13.3/drivers/usb/dwc2/core.c /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/usb/dwc2/core.c
--- linux-4.13.3/drivers/usb/dwc2/core.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/usb/dwc2/core.c	2018-01-10 15:09:54.669987721 +0800
@@ -248,7 +248,7 @@
 {
 	ktime_t start;
 	ktime_t end;
-	unsigned int timeout = 110;
+	unsigned int timeout = 1000;
 
 	dev_vdbg(hsotg->dev, "Waiting for %s mode\n",
 		 host_mode ? "host" : "device");
diff -uNr linux-4.13.3/drivers/usb/dwc2/platform.c /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/usb/dwc2/platform.c
--- linux-4.13.3/drivers/usb/dwc2/platform.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/drivers/usb/dwc2/platform.c	2018-01-10 15:09:54.677987501 +0800
@@ -414,6 +414,9 @@
 	 * Reset before dwc2_get_hwparams() then it could get power-on real
 	 * reset value form registers.
 	 */
+	// STM32 USB HS in FS mode
+	*(uint32_t*)0x4004000c |= 0x00000040;
+	msleep(1);
 	dwc2_core_reset_and_force_dr_mode(hsotg);
 
 	/* Detect config values from hardware */
diff -uNr linux-4.13.3/fs/Kconfig /home/hyq/projects/embed/stm32/linux-4.13.3/fs/Kconfig
--- linux-4.13.3/fs/Kconfig	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/Kconfig	2018-01-10 15:09:56.473938243 +0800
@@ -232,6 +232,7 @@
 source "fs/befs/Kconfig"
 source "fs/bfs/Kconfig"
 source "fs/efs/Kconfig"
+source "fs/yaffs2/Kconfig"
 source "fs/jffs2/Kconfig"
 # UBIFS File system configuration
 source "fs/ubifs/Kconfig"
diff -uNr linux-4.13.3/fs/Kconfig.pre.yaffs /home/hyq/projects/embed/stm32/linux-4.13.3/fs/Kconfig.pre.yaffs
--- linux-4.13.3/fs/Kconfig.pre.yaffs	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/Kconfig.pre.yaffs	2018-01-10 15:09:56.161946800 +0800
@@ -0,0 +1,311 @@
+#
+# File system configuration
+#
+
+menu "File systems"
+
+# Use unaligned word dcache accesses
+config DCACHE_WORD_ACCESS
+       bool
+
+if BLOCK
+
+config FS_IOMAP
+	bool
+
+source "fs/ext2/Kconfig"
+source "fs/ext4/Kconfig"
+source "fs/jbd2/Kconfig"
+
+config FS_MBCACHE
+# Meta block cache for Extended Attributes (ext2/ext3/ext4)
+	tristate
+	default y if EXT2_FS=y && EXT2_FS_XATTR
+	default y if EXT4_FS=y
+	default m if EXT2_FS_XATTR || EXT4_FS
+
+source "fs/reiserfs/Kconfig"
+source "fs/jfs/Kconfig"
+
+source "fs/xfs/Kconfig"
+source "fs/gfs2/Kconfig"
+source "fs/ocfs2/Kconfig"
+source "fs/btrfs/Kconfig"
+source "fs/nilfs2/Kconfig"
+source "fs/f2fs/Kconfig"
+
+config FS_DAX
+	bool "Direct Access (DAX) support"
+	depends on MMU
+	depends on !(ARM || MIPS || SPARC)
+	select FS_IOMAP
+	select DAX
+	help
+	  Direct Access (DAX) can be used on memory-backed block devices.
+	  If the block device supports DAX and the filesystem supports DAX,
+	  then you can avoid using the pagecache to buffer I/Os.  Turning
+	  on this option will compile in support for DAX; you will need to
+	  mount the filesystem using the -o dax option.
+
+	  If you do not have a block device that is capable of using this,
+	  or if unsure, say N.  Saying Y will increase the size of the kernel
+	  by about 5kB.
+
+config FS_DAX_PMD
+	bool
+	default FS_DAX
+	depends on FS_DAX
+	depends on ZONE_DEVICE
+	depends on TRANSPARENT_HUGEPAGE
+
+endif # BLOCK
+
+# Posix ACL utility routines
+#
+# Note: Posix ACLs can be implemented without these helpers.  Never use
+# this symbol for ifdefs in core code.
+#
+config FS_POSIX_ACL
+	def_bool n
+
+config EXPORTFS
+	tristate
+
+config EXPORTFS_BLOCK_OPS
+	bool "Enable filesystem export operations for block IO"
+	help
+	  This option enables the export operations for a filesystem to support
+	  external block IO.
+
+config FILE_LOCKING
+	bool "Enable POSIX file locking API" if EXPERT
+	default y
+	help
+	  This option enables standard file locking support, required
+          for filesystems like NFS and for the flock() system
+          call. Disabling this option saves about 11k.
+
+config MANDATORY_FILE_LOCKING
+	bool "Enable Mandatory file locking"
+	depends on FILE_LOCKING
+	default y
+	help
+	  This option enables files appropriately marked files on appropriely
+	  mounted filesystems to support mandatory locking.
+
+	  To the best of my knowledge this is dead code that no one cares about.
+
+source "fs/crypto/Kconfig"
+
+source "fs/notify/Kconfig"
+
+source "fs/quota/Kconfig"
+
+source "fs/autofs4/Kconfig"
+source "fs/fuse/Kconfig"
+source "fs/overlayfs/Kconfig"
+
+menu "Caches"
+
+source "fs/fscache/Kconfig"
+source "fs/cachefiles/Kconfig"
+
+endmenu
+
+if BLOCK
+menu "CD-ROM/DVD Filesystems"
+
+source "fs/isofs/Kconfig"
+source "fs/udf/Kconfig"
+
+endmenu
+endif # BLOCK
+
+if BLOCK
+menu "DOS/FAT/NT Filesystems"
+
+source "fs/fat/Kconfig"
+source "fs/ntfs/Kconfig"
+
+endmenu
+endif # BLOCK
+
+menu "Pseudo filesystems"
+
+source "fs/proc/Kconfig"
+source "fs/kernfs/Kconfig"
+source "fs/sysfs/Kconfig"
+
+config TMPFS
+	bool "Tmpfs virtual memory file system support (former shm fs)"
+	depends on SHMEM
+	help
+	  Tmpfs is a file system which keeps all files in virtual memory.
+
+	  Everything in tmpfs is temporary in the sense that no files will be
+	  created on your hard drive. The files live in memory and swap
+	  space. If you unmount a tmpfs instance, everything stored therein is
+	  lost.
+
+	  See <file:Documentation/filesystems/tmpfs.txt> for details.
+
+config TMPFS_POSIX_ACL
+	bool "Tmpfs POSIX Access Control Lists"
+	depends on TMPFS
+	select TMPFS_XATTR
+	select FS_POSIX_ACL
+	help
+	  POSIX Access Control Lists (ACLs) support additional access rights
+	  for users and groups beyond the standard owner/group/world scheme,
+	  and this option selects support for ACLs specifically for tmpfs
+	  filesystems.
+
+	  If you've selected TMPFS, it's possible that you'll also need
+	  this option as there are a number of Linux distros that require
+	  POSIX ACL support under /dev for certain features to work properly.
+	  For example, some distros need this feature for ALSA-related /dev
+	  files for sound to work properly.  In short, if you're not sure,
+	  say Y.
+
+	  To learn more about Access Control Lists, visit the POSIX ACLs for
+	  Linux website <http://acl.bestbits.at/>.
+
+config TMPFS_XATTR
+	bool "Tmpfs extended attributes"
+	depends on TMPFS
+	default n
+	help
+	  Extended attributes are name:value pairs associated with inodes by
+	  the kernel or by users (see the attr(5) manual page, or visit
+	  <http://acl.bestbits.at/> for details).
+
+	  Currently this enables support for the trusted.* and
+	  security.* namespaces.
+
+	  You need this for POSIX ACL support on tmpfs.
+
+	  If unsure, say N.
+
+config HUGETLBFS
+	bool "HugeTLB file system support"
+	depends on X86 || IA64 || SPARC64 || (S390 && 64BIT) || \
+		   SYS_SUPPORTS_HUGETLBFS || BROKEN
+	help
+	  hugetlbfs is a filesystem backing for HugeTLB pages, based on
+	  ramfs. For architectures that support it, say Y here and read
+	  <file:Documentation/vm/hugetlbpage.txt> for details.
+
+	  If unsure, say N.
+
+config HUGETLB_PAGE
+	def_bool HUGETLBFS
+
+config ARCH_HAS_GIGANTIC_PAGE
+	bool
+
+source "fs/configfs/Kconfig"
+source "fs/efivarfs/Kconfig"
+
+endmenu
+
+menuconfig MISC_FILESYSTEMS
+	bool "Miscellaneous filesystems"
+	default y
+	---help---
+	  Say Y here to get to see options for various miscellaneous
+	  filesystems, such as filesystems that came from other
+	  operating systems.
+
+	  This option alone does not add any kernel code.
+
+	  If you say N, all options in this submenu will be skipped and
+	  disabled; if unsure, say Y here.
+
+if MISC_FILESYSTEMS
+
+source "fs/orangefs/Kconfig"
+source "fs/adfs/Kconfig"
+source "fs/affs/Kconfig"
+source "fs/ecryptfs/Kconfig"
+source "fs/hfs/Kconfig"
+source "fs/hfsplus/Kconfig"
+source "fs/befs/Kconfig"
+source "fs/bfs/Kconfig"
+source "fs/efs/Kconfig"
+source "fs/jffs2/Kconfig"
+# UBIFS File system configuration
+source "fs/ubifs/Kconfig"
+source "fs/cramfs/Kconfig"
+source "fs/squashfs/Kconfig"
+source "fs/freevxfs/Kconfig"
+source "fs/minix/Kconfig"
+source "fs/omfs/Kconfig"
+source "fs/hpfs/Kconfig"
+source "fs/qnx4/Kconfig"
+source "fs/qnx6/Kconfig"
+source "fs/romfs/Kconfig"
+source "fs/pstore/Kconfig"
+source "fs/sysv/Kconfig"
+source "fs/ufs/Kconfig"
+source "fs/exofs/Kconfig"
+
+endif # MISC_FILESYSTEMS
+
+source "fs/exofs/Kconfig.ore"
+
+menuconfig NETWORK_FILESYSTEMS
+	bool "Network File Systems"
+	default y
+	depends on NET
+	---help---
+	  Say Y here to get to see options for network filesystems and
+	  filesystem-related networking code, such as NFS daemon and
+	  RPCSEC security modules.
+
+	  This option alone does not add any kernel code.
+
+	  If you say N, all options in this submenu will be skipped and
+	  disabled; if unsure, say Y here.
+
+if NETWORK_FILESYSTEMS
+
+source "fs/nfs/Kconfig"
+source "fs/nfsd/Kconfig"
+
+config GRACE_PERIOD
+	tristate
+
+config LOCKD
+	tristate
+	depends on FILE_LOCKING
+	select GRACE_PERIOD
+
+config LOCKD_V4
+	bool
+	depends on NFSD_V3 || NFS_V3
+	depends on FILE_LOCKING
+	default y
+
+config NFS_ACL_SUPPORT
+	tristate
+	select FS_POSIX_ACL
+
+config NFS_COMMON
+	bool
+	depends on NFSD || NFS_FS || LOCKD
+	default y
+
+source "net/sunrpc/Kconfig"
+source "fs/ceph/Kconfig"
+source "fs/cifs/Kconfig"
+source "fs/ncpfs/Kconfig"
+source "fs/coda/Kconfig"
+source "fs/afs/Kconfig"
+source "fs/9p/Kconfig"
+
+endif # NETWORK_FILESYSTEMS
+
+source "fs/nls/Kconfig"
+source "fs/dlm/Kconfig"
+
+endmenu
diff -uNr linux-4.13.3/fs/Makefile /home/hyq/projects/embed/stm32/linux-4.13.3/fs/Makefile
--- linux-4.13.3/fs/Makefile	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/Makefile	2018-01-10 15:09:56.161946800 +0800
@@ -128,3 +128,4 @@
 obj-$(CONFIG_CEPH_FS)		+= ceph/
 obj-$(CONFIG_PSTORE)		+= pstore/
 obj-$(CONFIG_EFIVAR_FS)		+= efivarfs/
+obj-$(CONFIG_YAFFS_FS)		+= yaffs2/
diff -uNr linux-4.13.3/fs/Makefile.pre.yaffs /home/hyq/projects/embed/stm32/linux-4.13.3/fs/Makefile.pre.yaffs
--- linux-4.13.3/fs/Makefile.pre.yaffs	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/Makefile.pre.yaffs	2018-01-10 15:09:56.473938243 +0800
@@ -0,0 +1,130 @@
+#
+# Makefile for the Linux filesystems.
+#
+# 14 Sep 2000, Christoph Hellwig <hch@infradead.org>
+# Rewritten to use lists instead of if-statements.
+# 
+
+obj-y :=	open.o read_write.o file_table.o super.o \
+		char_dev.o stat.o exec.o pipe.o namei.o fcntl.o \
+		ioctl.o readdir.o select.o dcache.o inode.o \
+		attr.o bad_inode.o file.o filesystems.o namespace.o \
+		seq_file.o xattr.o libfs.o fs-writeback.o \
+		pnode.o splice.o sync.o utimes.o \
+		stack.o fs_struct.o statfs.o fs_pin.o nsfs.o
+
+ifeq ($(CONFIG_BLOCK),y)
+obj-y +=	buffer.o block_dev.o direct-io.o mpage.o
+else
+obj-y +=	no-block.o
+endif
+
+obj-$(CONFIG_PROC_FS) += proc_namespace.o
+
+obj-y				+= notify/
+obj-$(CONFIG_EPOLL)		+= eventpoll.o
+obj-$(CONFIG_ANON_INODES)	+= anon_inodes.o
+obj-$(CONFIG_SIGNALFD)		+= signalfd.o
+obj-$(CONFIG_TIMERFD)		+= timerfd.o
+obj-$(CONFIG_EVENTFD)		+= eventfd.o
+obj-$(CONFIG_USERFAULTFD)	+= userfaultfd.o
+obj-$(CONFIG_AIO)               += aio.o
+obj-$(CONFIG_FS_DAX)		+= dax.o
+obj-$(CONFIG_FS_ENCRYPTION)	+= crypto/
+obj-$(CONFIG_FILE_LOCKING)      += locks.o
+obj-$(CONFIG_COMPAT)		+= compat.o compat_ioctl.o
+obj-$(CONFIG_BINFMT_AOUT)	+= binfmt_aout.o
+obj-$(CONFIG_BINFMT_EM86)	+= binfmt_em86.o
+obj-$(CONFIG_BINFMT_MISC)	+= binfmt_misc.o
+obj-$(CONFIG_BINFMT_SCRIPT)	+= binfmt_script.o
+obj-$(CONFIG_BINFMT_ELF)	+= binfmt_elf.o
+obj-$(CONFIG_COMPAT_BINFMT_ELF)	+= compat_binfmt_elf.o
+obj-$(CONFIG_BINFMT_ELF_FDPIC)	+= binfmt_elf_fdpic.o
+obj-$(CONFIG_BINFMT_FLAT)	+= binfmt_flat.o
+
+obj-$(CONFIG_FS_MBCACHE)	+= mbcache.o
+obj-$(CONFIG_FS_POSIX_ACL)	+= posix_acl.o
+obj-$(CONFIG_NFS_COMMON)	+= nfs_common/
+obj-$(CONFIG_COREDUMP)		+= coredump.o
+obj-$(CONFIG_SYSCTL)		+= drop_caches.o
+
+obj-$(CONFIG_FHANDLE)		+= fhandle.o
+obj-$(CONFIG_FS_IOMAP)		+= iomap.o
+
+obj-y				+= quota/
+
+obj-$(CONFIG_PROC_FS)		+= proc/
+obj-$(CONFIG_KERNFS)		+= kernfs/
+obj-$(CONFIG_SYSFS)		+= sysfs/
+obj-$(CONFIG_CONFIGFS_FS)	+= configfs/
+obj-y				+= devpts/
+
+obj-$(CONFIG_PROFILING)		+= dcookies.o
+obj-$(CONFIG_DLM)		+= dlm/
+ 
+# Do not add any filesystems before this line
+obj-$(CONFIG_FSCACHE)		+= fscache/
+obj-$(CONFIG_REISERFS_FS)	+= reiserfs/
+obj-$(CONFIG_EXT4_FS)		+= ext4/
+# We place ext4 before ext2 so that clean ext3 root fs's do NOT mount using the
+# ext2 driver, which doesn't know about journalling!  Explicitly request ext2
+# by giving the rootfstype= parameter.
+obj-$(CONFIG_EXT2_FS)		+= ext2/
+obj-$(CONFIG_JBD2)		+= jbd2/
+obj-$(CONFIG_CRAMFS)		+= cramfs/
+obj-$(CONFIG_SQUASHFS)		+= squashfs/
+obj-y				+= ramfs/
+obj-$(CONFIG_HUGETLBFS)		+= hugetlbfs/
+obj-$(CONFIG_CODA_FS)		+= coda/
+obj-$(CONFIG_MINIX_FS)		+= minix/
+obj-$(CONFIG_FAT_FS)		+= fat/
+obj-$(CONFIG_BFS_FS)		+= bfs/
+obj-$(CONFIG_ISO9660_FS)	+= isofs/
+obj-$(CONFIG_HFSPLUS_FS)	+= hfsplus/ # Before hfs to find wrapped HFS+
+obj-$(CONFIG_HFS_FS)		+= hfs/
+obj-$(CONFIG_ECRYPT_FS)		+= ecryptfs/
+obj-$(CONFIG_VXFS_FS)		+= freevxfs/
+obj-$(CONFIG_NFS_FS)		+= nfs/
+obj-$(CONFIG_EXPORTFS)		+= exportfs/
+obj-$(CONFIG_NFSD)		+= nfsd/
+obj-$(CONFIG_LOCKD)		+= lockd/
+obj-$(CONFIG_NLS)		+= nls/
+obj-$(CONFIG_SYSV_FS)		+= sysv/
+obj-$(CONFIG_CIFS)		+= cifs/
+obj-$(CONFIG_NCP_FS)		+= ncpfs/
+obj-$(CONFIG_HPFS_FS)		+= hpfs/
+obj-$(CONFIG_NTFS_FS)		+= ntfs/
+obj-$(CONFIG_UFS_FS)		+= ufs/
+obj-$(CONFIG_EFS_FS)		+= efs/
+obj-$(CONFIG_JFFS2_FS)		+= jffs2/
+obj-$(CONFIG_UBIFS_FS)		+= ubifs/
+obj-$(CONFIG_AFFS_FS)		+= affs/
+obj-$(CONFIG_ROMFS_FS)		+= romfs/
+obj-$(CONFIG_QNX4FS_FS)		+= qnx4/
+obj-$(CONFIG_QNX6FS_FS)		+= qnx6/
+obj-$(CONFIG_AUTOFS4_FS)	+= autofs4/
+obj-$(CONFIG_ADFS_FS)		+= adfs/
+obj-$(CONFIG_FUSE_FS)		+= fuse/
+obj-$(CONFIG_OVERLAY_FS)	+= overlayfs/
+obj-$(CONFIG_ORANGEFS_FS)       += orangefs/
+obj-$(CONFIG_UDF_FS)		+= udf/
+obj-$(CONFIG_SUN_OPENPROMFS)	+= openpromfs/
+obj-$(CONFIG_OMFS_FS)		+= omfs/
+obj-$(CONFIG_JFS_FS)		+= jfs/
+obj-$(CONFIG_XFS_FS)		+= xfs/
+obj-$(CONFIG_9P_FS)		+= 9p/
+obj-$(CONFIG_AFS_FS)		+= afs/
+obj-$(CONFIG_NILFS2_FS)		+= nilfs2/
+obj-$(CONFIG_BEFS_FS)		+= befs/
+obj-$(CONFIG_HOSTFS)		+= hostfs/
+obj-$(CONFIG_CACHEFILES)	+= cachefiles/
+obj-$(CONFIG_DEBUG_FS)		+= debugfs/
+obj-$(CONFIG_TRACING)		+= tracefs/
+obj-$(CONFIG_OCFS2_FS)		+= ocfs2/
+obj-$(CONFIG_BTRFS_FS)		+= btrfs/
+obj-$(CONFIG_GFS2_FS)           += gfs2/
+obj-$(CONFIG_F2FS_FS)		+= f2fs/
+obj-y				+= exofs/ # Multiple modules
+obj-$(CONFIG_CEPH_FS)		+= ceph/
+obj-$(CONFIG_PSTORE)		+= pstore/
+obj-$(CONFIG_EFIVAR_FS)		+= efivarfs/
diff -uNr linux-4.13.3/fs/namei.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/namei.c
--- linux-4.13.3/fs/namei.c	2017-09-20 14:28:17.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/namei.c	2018-01-10 15:09:56.457938682 +0800
@@ -4663,6 +4663,7 @@
 out:
 	return len;
 }
+EXPORT_SYMBOL(readlink_copy);
 
 /*
  * A helper for ->readlink().  This should be used *ONLY* for symlinks that
diff -uNr linux-4.13.3/fs/yaffs2/Kconfig /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/Kconfig
--- linux-4.13.3/fs/yaffs2/Kconfig	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/Kconfig	2018-01-10 15:09:56.489937804 +0800
@@ -0,0 +1,171 @@
+#
+# yaffs file system configurations
+#
+
+config YAFFS_FS
+	tristate "yaffs2 file system support"
+	default n
+	depends on MTD_BLOCK
+	select YAFFS_YAFFS1
+	select YAFFS_YAFFS2
+	help
+	  yaffs2, or Yet Another Flash File System, is a file system
+	  optimised for NAND Flash chips.
+
+	  To compile the yaffs2 file system support as a module, choose M
+	  here: the module will be called yaffs2.
+
+	  If unsure, say N.
+
+	  Further information on yaffs2 is available at
+	  <http://www.aleph1.co.uk/yaffs/>.
+
+config YAFFS_YAFFS1
+	bool "512 byte / page devices"
+	depends on YAFFS_FS
+	default y
+	help
+	  Enable yaffs1 support -- yaffs for 512 byte / page devices
+
+	  Not needed for 2K-page devices.
+
+	  If unsure, say Y.
+
+config YAFFS_9BYTE_TAGS
+	bool "Use older-style on-NAND data format with pageStatus byte"
+	depends on YAFFS_YAFFS1
+	default n
+	help
+
+	  Older-style on-NAND data format has a "pageStatus" byte to record
+	  chunk/page state.  This byte is zero when the page is discarded.
+	  Choose this option if you have existing on-NAND data using this
+	  format that you need to continue to support.  New data written
+	  also uses the older-style format.  Note: Use of this option
+	  generally requires that MTD's oob layout be adjusted to use the
+	  older-style format.  See notes on tags formats and MTD versions
+	  in yaffs_mtdif1.c.
+
+	  If unsure, say N.
+
+config YAFFS_DOES_ECC
+	bool "Lets yaffs do its own ECC"
+	depends on YAFFS_FS && YAFFS_YAFFS1 && !YAFFS_9BYTE_TAGS
+	default n
+	help
+	  This enables yaffs to use its own ECC functions instead of using
+	  the ones from the generic MTD-NAND driver.
+
+	  If unsure, say N.
+
+config YAFFS_ECC_WRONG_ORDER
+	bool "Use the same ecc byte order as Steven Hill's nand_ecc.c"
+	depends on YAFFS_FS && YAFFS_DOES_ECC && !YAFFS_9BYTE_TAGS
+	default n
+	help
+	  This makes yaffs_ecc.c use the same ecc byte order as Steven
+	  Hill's nand_ecc.c. If not set, then you get the same ecc byte
+	  order as SmartMedia.
+
+	  If unsure, say N.
+
+config YAFFS_YAFFS2
+	bool "2048 byte (or larger) / page devices"
+	depends on YAFFS_FS
+	default y
+	help
+	  Enable yaffs2 support -- yaffs for >= 2K bytes per page devices
+
+	  If unsure, say Y.
+
+config YAFFS_AUTO_YAFFS2
+	bool "Autoselect yaffs2 format"
+	depends on YAFFS_YAFFS2
+	default y
+	help
+	  Without this, you need to explicitely use yaffs2 as the file
+	  system type. With this, you can say "yaffs" and yaffs or yaffs2
+	  will be used depending on the device page size (yaffs on
+	  512-byte page devices, yaffs2 on 2K page devices).
+
+	  If unsure, say Y.
+
+config YAFFS_DISABLE_TAGS_ECC
+	bool "Disable yaffs from doing ECC on tags by default"
+	depends on YAFFS_FS && YAFFS_YAFFS2
+	default n
+	help
+	  This defaults yaffs to using its own ECC calculations on tags instead of
+	  just relying on the MTD.
+	  This behavior can also be overridden with tags_ecc_on and
+	  tags_ecc_off mount options.
+
+	  If unsure, say N.
+
+config YAFFS_ALWAYS_CHECK_CHUNK_ERASED
+	bool "Force chunk erase check"
+	depends on YAFFS_FS
+	default n
+	help
+          Normally yaffs only checks chunks before writing until an erased
+	  chunk is found. This helps to detect any partially written
+	  chunks that might have happened due to power loss.
+
+	  Enabling this forces on the test that chunks are erased in flash
+	  before writing to them. This takes more time but is potentially
+	  a bit more secure.
+
+	  Suggest setting Y during development and ironing out driver
+	  issues etc. Suggest setting to N if you want faster writing.
+
+	  If unsure, say Y.
+
+config YAFFS_EMPTY_LOST_AND_FOUND
+	bool "Empty lost and found on boot"
+	depends on YAFFS_FS
+	default n
+	help
+	  If this is enabled then the contents of lost and found is
+	  automatically dumped at mount.
+
+	  If unsure, say N.
+
+config YAFFS_DISABLE_BLOCK_REFRESHING
+	bool "Disable yaffs2 block refreshing"
+	depends on YAFFS_FS
+	default n
+	help
+	 If this is set, then block refreshing is disabled.
+	 Block refreshing infrequently refreshes the oldest block in
+	 a yaffs2 file system. This mechanism helps to refresh flash to
+	 mitigate against data loss. This is particularly useful for MLC.
+
+	  If unsure, say N.
+
+config YAFFS_DISABLE_BACKGROUND
+	bool "Disable yaffs2 background processing"
+	depends on YAFFS_FS
+	default n
+	help
+	 If this is set, then background processing is disabled.
+	 Background processing makes many foreground activities faster.
+
+	 If unsure, say N.
+
+config YAFFS_DISABLE_BAD_BLOCK_MARKING
+	bool "Disable yaffs2 bad block marking"
+	depends on YAFFS_FS
+	default n
+	help
+	 Useful during early flash bring up to prevent problems causing
+	 lots of bad block marking.
+
+	 If unsure, say N.
+
+config YAFFS_XATTR
+	bool "Enable yaffs2 xattr support"
+	depends on YAFFS_FS
+	default y
+	help
+	 If this is set then yaffs2 will provide xattr support.
+	 If unsure, say Y.
diff -uNr linux-4.13.3/fs/yaffs2/Makefile /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/Makefile
--- linux-4.13.3/fs/yaffs2/Makefile	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/Makefile	2018-01-10 15:09:56.489937804 +0800
@@ -0,0 +1,19 @@
+#
+# Makefile for the linux YAFFS filesystem routines.
+#
+
+obj-$(CONFIG_YAFFS_FS) += yaffs.o
+
+yaffs-y := yaffs_ecc.o yaffs_vfs.o yaffs_guts.o yaffs_checkptrw.o
+yaffs-y += yaffs_packedtags1.o yaffs_packedtags2.o yaffs_nand.o
+yaffs-y += yaffs_tagscompat.o yaffs_tagsmarshall.o
+yaffs-y += yaffs_endian.o
+yaffs-y += yaffs_mtdif.o
+yaffs-y += yaffs_nameval.o yaffs_attribs.o
+yaffs-y += yaffs_allocator.o
+yaffs-y += yaffs_yaffs1.o
+yaffs-y += yaffs_yaffs2.o
+yaffs-y += yaffs_bitmap.o
+yaffs-y += yaffs_summary.o
+yaffs-y += yaffs_verify.o
+
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_allocator.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_allocator.c
--- linux-4.13.3/fs/yaffs2/yaffs_allocator.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_allocator.c	2018-01-10 15:09:56.501937475 +0800
@@ -0,0 +1,357 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_allocator.h"
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yportenv.h"
+
+/*
+ * Each entry in yaffs_tnode_list and yaffs_obj_list hold blocks
+ * of approx 100 objects that are themn allocated singly.
+ * This is basically a simplified slab allocator.
+ *
+ * We don't use the Linux slab allocator because slab does not allow
+ * us to dump all the objects in one hit when we do a umount and tear
+ * down  all the tnodes and objects. slab requires that we first free
+ * the individual objects.
+ *
+ * Once yaffs has been mainlined I shall try to motivate for a change
+ * to slab to provide the extra features we need here.
+ */
+
+struct yaffs_tnode_list {
+	struct yaffs_tnode_list *next;
+	struct yaffs_tnode *tnodes;
+};
+
+struct yaffs_obj_list {
+	struct yaffs_obj_list *next;
+	struct yaffs_obj *objects;
+};
+
+struct yaffs_allocator {
+	int n_tnodes_created;
+	struct yaffs_tnode *free_tnodes;
+	int n_free_tnodes;
+	struct yaffs_tnode_list *alloc_tnode_list;
+
+	int n_obj_created;
+	struct list_head free_objs;
+	int n_free_objects;
+
+	struct yaffs_obj_list *allocated_obj_list;
+};
+
+static void yaffs_deinit_raw_tnodes(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator =
+	    (struct yaffs_allocator *)dev->allocator;
+	struct yaffs_tnode_list *tmp;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	while (allocator->alloc_tnode_list) {
+		tmp = allocator->alloc_tnode_list->next;
+
+		kfree(allocator->alloc_tnode_list->tnodes);
+		kfree(allocator->alloc_tnode_list);
+		allocator->alloc_tnode_list = tmp;
+	}
+
+	allocator->free_tnodes = NULL;
+	allocator->n_free_tnodes = 0;
+	allocator->n_tnodes_created = 0;
+}
+
+static void yaffs_init_raw_tnodes(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator = dev->allocator;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	allocator->alloc_tnode_list = NULL;
+	allocator->free_tnodes = NULL;
+	allocator->n_free_tnodes = 0;
+	allocator->n_tnodes_created = 0;
+}
+
+static int yaffs_create_tnodes(struct yaffs_dev *dev, int n_tnodes)
+{
+	struct yaffs_allocator *allocator =
+	    (struct yaffs_allocator *)dev->allocator;
+	int i;
+	struct yaffs_tnode *new_tnodes;
+	u8 *mem;
+	struct yaffs_tnode *curr;
+	struct yaffs_tnode *next;
+	struct yaffs_tnode_list *tnl;
+
+	if (!allocator) {
+		BUG();
+		return YAFFS_FAIL;
+	}
+
+	if (n_tnodes < 1)
+		return YAFFS_OK;
+
+	/* make these things */
+	new_tnodes = kmalloc(n_tnodes * dev->tnode_size, GFP_NOFS);
+	mem = (u8 *) new_tnodes;
+
+	if (!new_tnodes) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"yaffs: Could not allocate Tnodes");
+		return YAFFS_FAIL;
+	}
+
+	/* New hookup for wide tnodes */
+	for (i = 0; i < n_tnodes - 1; i++) {
+		curr = (struct yaffs_tnode *)&mem[i * dev->tnode_size];
+		next = (struct yaffs_tnode *)&mem[(i + 1) * dev->tnode_size];
+		curr->internal[0] = next;
+	}
+
+	curr = (struct yaffs_tnode *)&mem[(n_tnodes - 1) * dev->tnode_size];
+	curr->internal[0] = allocator->free_tnodes;
+	allocator->free_tnodes = (struct yaffs_tnode *)mem;
+
+	allocator->n_free_tnodes += n_tnodes;
+	allocator->n_tnodes_created += n_tnodes;
+
+	/* Now add this bunch of tnodes to a list for freeing up.
+	 * NB If we can't add this to the management list it isn't fatal
+	 * but it just means we can't free this bunch of tnodes later.
+	 */
+	tnl = kmalloc(sizeof(struct yaffs_tnode_list), GFP_NOFS);
+	if (!tnl) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"Could not add tnodes to management list");
+		return YAFFS_FAIL;
+	} else {
+		tnl->tnodes = new_tnodes;
+		tnl->next = allocator->alloc_tnode_list;
+		allocator->alloc_tnode_list = tnl;
+	}
+
+	yaffs_trace(YAFFS_TRACE_ALLOCATE, "Tnodes added");
+
+	return YAFFS_OK;
+}
+
+struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator =
+	    (struct yaffs_allocator *)dev->allocator;
+	struct yaffs_tnode *tn = NULL;
+
+	if (!allocator) {
+		BUG();
+		return NULL;
+	}
+
+	/* If there are none left make more */
+	if (!allocator->free_tnodes)
+		yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES);
+
+	if (allocator->free_tnodes) {
+		tn = allocator->free_tnodes;
+		allocator->free_tnodes = allocator->free_tnodes->internal[0];
+		allocator->n_free_tnodes--;
+	}
+
+	return tn;
+}
+
+/* FreeTnode frees up a tnode and puts it back on the free list */
+void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
+{
+	struct yaffs_allocator *allocator = dev->allocator;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	if (tn) {
+		tn->internal[0] = allocator->free_tnodes;
+		allocator->free_tnodes = tn;
+		allocator->n_free_tnodes++;
+	}
+	dev->checkpoint_blocks_required = 0;	/* force recalculation */
+}
+
+/*--------------- yaffs_obj alloaction ------------------------
+ *
+ * Free yaffs_objs are stored in a list using obj->siblings.
+ * The blocks of allocated objects are stored in a linked list.
+ */
+
+static void yaffs_init_raw_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator = dev->allocator;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	allocator->allocated_obj_list = NULL;
+	INIT_LIST_HEAD(&allocator->free_objs);
+	allocator->n_free_objects = 0;
+}
+
+static void yaffs_deinit_raw_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator = dev->allocator;
+	struct yaffs_obj_list *tmp;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	while (allocator->allocated_obj_list) {
+		tmp = allocator->allocated_obj_list->next;
+		kfree(allocator->allocated_obj_list->objects);
+		kfree(allocator->allocated_obj_list);
+		allocator->allocated_obj_list = tmp;
+	}
+
+	INIT_LIST_HEAD(&allocator->free_objs);
+	allocator->n_free_objects = 0;
+	allocator->n_obj_created = 0;
+}
+
+static int yaffs_create_free_objs(struct yaffs_dev *dev, int n_obj)
+{
+	struct yaffs_allocator *allocator = dev->allocator;
+	int i;
+	struct yaffs_obj *new_objs;
+	struct yaffs_obj_list *list;
+
+	if (!allocator) {
+		BUG();
+		return YAFFS_FAIL;
+	}
+
+	if (n_obj < 1)
+		return YAFFS_OK;
+
+	/* make these things */
+	new_objs = kmalloc(n_obj * sizeof(struct yaffs_obj), GFP_NOFS);
+	list = kmalloc(sizeof(struct yaffs_obj_list), GFP_NOFS);
+
+	if (!new_objs || !list) {
+		kfree(new_objs);
+		new_objs = NULL;
+		kfree(list);
+		list = NULL;
+		yaffs_trace(YAFFS_TRACE_ALLOCATE,
+			"Could not allocate more objects");
+		return YAFFS_FAIL;
+	}
+
+	/* Hook them into the free list */
+	for (i = 0; i < n_obj; i++)
+		list_add(&new_objs[i].siblings, &allocator->free_objs);
+
+	allocator->n_free_objects += n_obj;
+	allocator->n_obj_created += n_obj;
+
+	/* Now add this bunch of Objects to a list for freeing up. */
+
+	list->objects = new_objs;
+	list->next = allocator->allocated_obj_list;
+	allocator->allocated_obj_list = list;
+
+	return YAFFS_OK;
+}
+
+struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj = NULL;
+	struct list_head *lh;
+	struct yaffs_allocator *allocator = dev->allocator;
+
+	if (!allocator) {
+		BUG();
+		return obj;
+	}
+
+	/* If there are none left make more */
+	if (list_empty(&allocator->free_objs))
+		yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS);
+
+	if (!list_empty(&allocator->free_objs)) {
+		lh = allocator->free_objs.next;
+		obj = list_entry(lh, struct yaffs_obj, siblings);
+		list_del_init(lh);
+		allocator->n_free_objects--;
+	}
+
+	return obj;
+}
+
+void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj)
+{
+
+	struct yaffs_allocator *allocator = dev->allocator;
+
+	if (!allocator) {
+		BUG();
+		return;
+	}
+
+	/* Link into the free list. */
+	list_add(&obj->siblings, &allocator->free_objs);
+	allocator->n_free_objects++;
+}
+
+void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev)
+{
+
+	if (!dev->allocator) {
+		BUG();
+		return;
+	}
+
+	yaffs_deinit_raw_tnodes(dev);
+	yaffs_deinit_raw_objs(dev);
+	kfree(dev->allocator);
+	dev->allocator = NULL;
+}
+
+void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_allocator *allocator;
+
+	if (dev->allocator) {
+		BUG();
+		return;
+	}
+
+	allocator = kmalloc(sizeof(struct yaffs_allocator), GFP_NOFS);
+	if (allocator) {
+		dev->allocator = allocator;
+		yaffs_init_raw_tnodes(dev);
+		yaffs_init_raw_objs(dev);
+	}
+}
+
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_allocator.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_allocator.h
--- linux-4.13.3/fs/yaffs2/yaffs_allocator.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_allocator.h	2018-01-10 15:09:56.573935500 +0800
@@ -0,0 +1,30 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_ALLOCATOR_H__
+#define __YAFFS_ALLOCATOR_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev);
+void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev);
+
+struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev);
+void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn);
+
+struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev);
+void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj);
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_attribs.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_attribs.c
--- linux-4.13.3/fs/yaffs2/yaffs_attribs.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_attribs.c	2018-01-10 15:09:56.509937256 +0800
@@ -0,0 +1,136 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_guts.h"
+#include "yaffs_attribs.h"
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0))
+#define IATTR_UID ia_uid
+#define IATTR_GID ia_gid
+#else
+#define IATTR_UID ia_uid.val
+#define IATTR_GID ia_gid.val
+#endif
+
+/*
+ * Loading attibs from/to object header assumes the object header
+ * is in cpu endian.
+ */
+void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh)
+{
+	obj->yst_uid = oh->yst_uid;
+	obj->yst_gid = oh->yst_gid;
+	obj->yst_atime = oh->yst_atime;
+	obj->yst_mtime = oh->yst_mtime;
+	obj->yst_ctime = oh->yst_ctime;
+	obj->yst_rdev = oh->yst_rdev;
+}
+
+void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj)
+{
+	oh->yst_uid = obj->yst_uid;
+	oh->yst_gid = obj->yst_gid;
+	oh->yst_atime = obj->yst_atime;
+	oh->yst_mtime = obj->yst_mtime;
+	oh->yst_ctime = obj->yst_ctime;
+	oh->yst_rdev = obj->yst_rdev;
+
+}
+
+void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c)
+{
+	obj->yst_mtime = Y_CURRENT_TIME;
+	if (do_a)
+		obj->yst_atime = obj->yst_mtime;
+	if (do_c)
+		obj->yst_ctime = obj->yst_mtime;
+}
+
+void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev)
+{
+	yaffs_load_current_time(obj, 1, 1);
+	obj->yst_rdev = rdev;
+	obj->yst_uid = uid;
+	obj->yst_gid = gid;
+}
+
+static loff_t yaffs_get_file_size(struct yaffs_obj *obj)
+{
+	YCHAR *alias = NULL;
+	obj = yaffs_get_equivalent_obj(obj);
+
+	switch (obj->variant_type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		return obj->variant.file_variant.file_size;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		alias = obj->variant.symlink_variant.alias;
+		if (!alias)
+			return 0;
+		return strnlen(alias, YAFFS_MAX_ALIAS_LENGTH);
+	default:
+		return 0;
+	}
+}
+
+int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr)
+{
+	unsigned int valid = attr->ia_valid;
+
+	if (valid & ATTR_MODE)
+		obj->yst_mode = attr->ia_mode;
+	if (valid & ATTR_UID)
+		obj->yst_uid = attr->IATTR_UID;
+	if (valid & ATTR_GID)
+		obj->yst_gid = attr->IATTR_GID;
+
+	if (valid & ATTR_ATIME)
+		obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
+	if (valid & ATTR_CTIME)
+		obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
+	if (valid & ATTR_MTIME)
+		obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
+
+	if (valid & ATTR_SIZE)
+		yaffs_resize_file(obj, attr->ia_size);
+
+	yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
+
+	return YAFFS_OK;
+
+}
+
+int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr)
+{
+	unsigned int valid = 0;
+
+	attr->ia_mode = obj->yst_mode;
+	valid |= ATTR_MODE;
+	attr->IATTR_UID = obj->yst_uid;
+	valid |= ATTR_UID;
+	attr->IATTR_GID = obj->yst_gid;
+	valid |= ATTR_GID;
+
+	Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
+	valid |= ATTR_ATIME;
+	Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
+	valid |= ATTR_CTIME;
+	Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
+	valid |= ATTR_MTIME;
+
+	attr->ia_size = yaffs_get_file_size(obj);
+	valid |= ATTR_SIZE;
+
+	attr->ia_valid = valid;
+
+	return YAFFS_OK;
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_attribs.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_attribs.h
--- linux-4.13.3/fs/yaffs2/yaffs_attribs.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_attribs.h	2018-01-10 15:09:56.573935500 +0800
@@ -0,0 +1,28 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_ATTRIBS_H__
+#define __YAFFS_ATTRIBS_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh);
+void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj);
+void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev);
+void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c);
+int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr);
+int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr);
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_bitmap.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_bitmap.c
--- linux-4.13.3/fs/yaffs2/yaffs_bitmap.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_bitmap.c	2018-01-10 15:09:56.509937256 +0800
@@ -0,0 +1,99 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_bitmap.h"
+#include "yaffs_trace.h"
+/*
+ * Chunk bitmap manipulations
+ */
+
+static inline u8 *yaffs_block_bits(struct yaffs_dev *dev, int blk)
+{
+	if (blk < (int)dev->internal_start_block ||
+	    blk > (int)dev->internal_end_block) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"BlockBits block %d is not valid",
+			blk);
+		BUG();
+	}
+	return dev->chunk_bits +
+	    (dev->chunk_bit_stride * (blk - dev->internal_start_block));
+}
+
+void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk)
+{
+	if (blk < (int)dev->internal_start_block ||
+	    blk > (int)dev->internal_end_block ||
+	    chunk < 0 || chunk >= (int)dev->param.chunks_per_block) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"Chunk Id (%d:%d) invalid",
+			blk, chunk);
+		BUG();
+	}
+}
+
+void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+
+	memset(blk_bits, 0, dev->chunk_bit_stride);
+}
+
+void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+
+	yaffs_verify_chunk_bit_id(dev, blk, chunk);
+	blk_bits[chunk / 8] &= ~(1 << (chunk & 7));
+}
+
+void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+
+	yaffs_verify_chunk_bit_id(dev, blk, chunk);
+	blk_bits[chunk / 8] |= (1 << (chunk & 7));
+}
+
+int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+
+	yaffs_verify_chunk_bit_id(dev, blk, chunk);
+	return (blk_bits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
+}
+
+int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+	int i;
+
+	for (i = 0; i < dev->chunk_bit_stride; i++) {
+		if (*blk_bits)
+			return 1;
+		blk_bits++;
+	}
+	return 0;
+}
+
+int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk)
+{
+	u8 *blk_bits = yaffs_block_bits(dev, blk);
+	int i;
+	int n = 0;
+
+	for (i = 0; i < dev->chunk_bit_stride; i++, blk_bits++)
+		n += hweight8(*blk_bits);
+
+	return n;
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_bitmap.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_bitmap.h
--- linux-4.13.3/fs/yaffs2/yaffs_bitmap.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_bitmap.h	2018-01-10 15:09:56.573935500 +0800
@@ -0,0 +1,33 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * Chunk bitmap manipulations
+ */
+
+#ifndef __YAFFS_BITMAP_H__
+#define __YAFFS_BITMAP_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk);
+void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk);
+void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
+void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
+int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
+int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk);
+int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk);
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_checkptrw.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_checkptrw.c
--- linux-4.13.3/fs/yaffs2/yaffs_checkptrw.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_checkptrw.c	2018-01-10 15:09:56.517937036 +0800
@@ -0,0 +1,481 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_checkptrw.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_endian.h"
+
+struct yaffs_checkpt_chunk_hdr {
+	int version;
+	int seq;
+	u32 sum;
+	u32 xor;
+} ;
+
+
+static int apply_chunk_offset(struct yaffs_dev *dev, int chunk)
+{
+	return chunk - dev->chunk_offset;
+}
+
+static int apply_block_offset(struct yaffs_dev *dev, int block)
+{
+	return block - dev->block_offset;
+}
+
+
+static void yaffs2_do_endian_hdr(struct yaffs_dev *dev,
+				 struct yaffs_checkpt_chunk_hdr *hdr)
+{
+	if (!dev->swap_endian)
+		return;
+	hdr->version = swap_s32(hdr->version);
+	hdr->seq     = swap_s32(hdr->seq);
+	hdr->sum     = swap_u32(hdr->sum);
+	hdr->xor     = swap_u32(hdr->xor);
+}
+
+static void yaffs2_checkpt_init_chunk_hdr(struct yaffs_dev *dev)
+{
+	struct yaffs_checkpt_chunk_hdr hdr;
+
+	hdr.version = YAFFS_CHECKPOINT_VERSION;
+	hdr.seq = dev->checkpt_page_seq;
+	hdr.sum = dev->checkpt_sum;
+	hdr.xor = dev->checkpt_xor;
+
+	dev->checkpt_byte_offs = sizeof(hdr);
+
+	yaffs2_do_endian_hdr(dev, &hdr);
+	memcpy(dev->checkpt_buffer, &hdr, sizeof(hdr));
+}
+
+static int yaffs2_checkpt_check_chunk_hdr(struct yaffs_dev *dev)
+{
+	struct yaffs_checkpt_chunk_hdr hdr;
+
+	memcpy(&hdr, dev->checkpt_buffer, sizeof(hdr));
+	yaffs2_do_endian_hdr(dev, &hdr);
+
+	dev->checkpt_byte_offs = sizeof(hdr);
+
+	return hdr.version == YAFFS_CHECKPOINT_VERSION &&
+		hdr.seq == dev->checkpt_page_seq &&
+		hdr.sum == dev->checkpt_sum &&
+		hdr.xor == dev->checkpt_xor;
+}
+
+static int yaffs2_checkpt_space_ok(struct yaffs_dev *dev)
+{
+	int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"checkpt blocks_avail = %d", blocks_avail);
+
+	return (blocks_avail <= 0) ? 0 : 1;
+}
+
+static int yaffs_checkpt_erase(struct yaffs_dev *dev)
+{
+	u32 i;
+
+	if (!dev->drv.drv_erase_fn)
+		return 0;
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"checking blocks %d to %d",
+		dev->internal_start_block, dev->internal_end_block);
+
+	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
+		int offset_i = apply_block_offset(dev, i);
+		int result;
+
+		if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
+			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"erasing checkpt block %d", i);
+
+			dev->n_erasures++;
+
+			result = dev->drv.drv_erase_fn(dev, offset_i);
+			if(result) {
+				bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
+				dev->n_erased_blocks++;
+				dev->n_free_chunks +=
+				    dev->param.chunks_per_block;
+			} else {
+				dev->drv.drv_mark_bad_fn(dev, offset_i);
+				bi->block_state = YAFFS_BLOCK_STATE_DEAD;
+			}
+		}
+	}
+
+	dev->blocks_in_checkpt = 0;
+
+	return 1;
+}
+
+static void yaffs2_checkpt_find_erased_block(struct yaffs_dev *dev)
+{
+	u32 i;
+	int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"allocating checkpt block: erased %d reserved %d avail %d next %d ",
+		dev->n_erased_blocks, dev->param.n_reserved_blocks,
+		blocks_avail, dev->checkpt_next_block);
+
+	if (dev->checkpt_next_block >= 0 &&
+	    dev->checkpt_next_block <= (int)dev->internal_end_block &&
+	    blocks_avail > 0) {
+
+		for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
+		     i++) {
+			struct yaffs_block_info *bi;
+
+			bi = yaffs_get_block_info(dev, i);
+			if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
+				dev->checkpt_next_block = i + 1;
+				dev->checkpt_cur_block = i;
+				yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+					"allocating checkpt block %d", i);
+				return;
+			}
+		}
+	}
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT, "out of checkpt blocks");
+
+	dev->checkpt_next_block = -1;
+	dev->checkpt_cur_block = -1;
+}
+
+static void yaffs2_checkpt_find_block(struct yaffs_dev *dev)
+{
+	u32 i;
+	struct yaffs_ext_tags tags;
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"find next checkpt block: start:  blocks %d next %d",
+		dev->blocks_in_checkpt, dev->checkpt_next_block);
+
+	if (dev->blocks_in_checkpt < dev->checkpt_max_blocks)
+		for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
+		     i++) {
+			int chunk = i * dev->param.chunks_per_block;
+			enum yaffs_block_state state;
+			u32 seq;
+
+			dev->tagger.read_chunk_tags_fn(dev,
+					apply_chunk_offset(dev, chunk),
+					NULL, &tags);
+			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+				"find next checkpt block: search: block %d state %d oid %d seq %d eccr %d",
+				i, (int) state,
+				tags.obj_id, tags.seq_number,
+				tags.ecc_result);
+
+			if (tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA)
+				continue;
+
+			dev->tagger.query_block_fn(dev,
+						apply_block_offset(dev, i),
+						&state, &seq);
+			if (state == YAFFS_BLOCK_STATE_DEAD)
+				continue;
+
+			/* Right kind of block */
+			dev->checkpt_next_block = tags.obj_id;
+			dev->checkpt_cur_block = i;
+			dev->checkpt_block_list[dev->blocks_in_checkpt] = i;
+			dev->blocks_in_checkpt++;
+			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+				"found checkpt block %d", i);
+			return;
+		}
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT, "found no more checkpt blocks");
+
+	dev->checkpt_next_block = -1;
+	dev->checkpt_cur_block = -1;
+}
+
+int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing)
+{
+	u32 i;
+
+	dev->checkpt_open_write = writing;
+
+	/* Got the functions we need? */
+	if (!dev->tagger.write_chunk_tags_fn ||
+	    !dev->tagger.read_chunk_tags_fn ||
+	    !dev->drv.drv_erase_fn ||
+	    !dev->drv.drv_mark_bad_fn)
+		return 0;
+
+	if (writing && !yaffs2_checkpt_space_ok(dev))
+		return 0;
+
+	if (!dev->checkpt_buffer)
+		dev->checkpt_buffer =
+		    kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
+	if (!dev->checkpt_buffer)
+		return 0;
+
+	dev->checkpt_page_seq = 0;
+	dev->checkpt_byte_count = 0;
+	dev->checkpt_sum = 0;
+	dev->checkpt_xor = 0;
+	dev->checkpt_cur_block = -1;
+	dev->checkpt_cur_chunk = -1;
+	dev->checkpt_next_block = dev->internal_start_block;
+
+	if (writing) {
+		memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
+		yaffs2_checkpt_init_chunk_hdr(dev);
+		return yaffs_checkpt_erase(dev);
+	}
+
+	/* Opening for a read */
+	/* Set to a value that will kick off a read */
+	dev->checkpt_byte_offs = dev->data_bytes_per_chunk;
+	/* A checkpoint block list of 1 checkpoint block per 16 block is
+	 * (hopefully) going to be way more than we need */
+	dev->blocks_in_checkpt = 0;
+	dev->checkpt_max_blocks =
+	    (dev->internal_end_block - dev->internal_start_block) / 16 + 2;
+	if (!dev->checkpt_block_list)
+		dev->checkpt_block_list =
+		      kmalloc(sizeof(int) * dev->checkpt_max_blocks, GFP_NOFS);
+
+	if (!dev->checkpt_block_list)
+		return 0;
+
+	for (i = 0; i < dev->checkpt_max_blocks; i++)
+		dev->checkpt_block_list[i] = -1;
+
+	return 1;
+}
+
+int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum)
+{
+	u32 composite_sum;
+
+	composite_sum = (dev->checkpt_sum << 8) | (dev->checkpt_xor & 0xff);
+	*sum = composite_sum;
+	return 1;
+}
+
+static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev)
+{
+	int chunk;
+	int offset_chunk;
+	struct yaffs_ext_tags tags;
+
+	if (dev->checkpt_cur_block < 0) {
+		yaffs2_checkpt_find_erased_block(dev);
+		dev->checkpt_cur_chunk = 0;
+	}
+
+	if (dev->checkpt_cur_block < 0)
+		return 0;
+
+	tags.is_deleted = 0;
+	tags.obj_id = dev->checkpt_next_block;	/* Hint to next place to look */
+	tags.chunk_id = dev->checkpt_page_seq + 1;
+	tags.seq_number = YAFFS_SEQUENCE_CHECKPOINT_DATA;
+	tags.n_bytes = dev->data_bytes_per_chunk;
+	if (dev->checkpt_cur_chunk == 0) {
+		/* First chunk we write for the block? Set block state to
+		   checkpoint */
+		struct yaffs_block_info *bi =
+		    yaffs_get_block_info(dev, dev->checkpt_cur_block);
+		bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
+		dev->blocks_in_checkpt++;
+	}
+
+	chunk =
+	    dev->checkpt_cur_block * dev->param.chunks_per_block +
+	    dev->checkpt_cur_chunk;
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"checkpoint wite buffer nand %d(%d:%d) objid %d chId %d",
+		chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk,
+		tags.obj_id, tags.chunk_id);
+
+	offset_chunk = apply_chunk_offset(dev, chunk);
+
+	dev->n_page_writes++;
+
+	dev->tagger.write_chunk_tags_fn(dev, offset_chunk,
+				       dev->checkpt_buffer, &tags);
+	dev->checkpt_page_seq++;
+	dev->checkpt_cur_chunk++;
+	if (dev->checkpt_cur_chunk >= (int)dev->param.chunks_per_block) {
+		dev->checkpt_cur_chunk = 0;
+		dev->checkpt_cur_block = -1;
+	}
+	memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
+
+	yaffs2_checkpt_init_chunk_hdr(dev);
+
+
+	return 1;
+}
+
+int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes)
+{
+	int i = 0;
+	int ok = 1;
+	u8 *data_bytes = (u8 *) data;
+
+	if (!dev->checkpt_buffer)
+		return 0;
+
+	if (!dev->checkpt_open_write)
+		return -1;
+
+	while (i < n_bytes && ok) {
+		dev->checkpt_buffer[dev->checkpt_byte_offs] = *data_bytes;
+		dev->checkpt_sum += *data_bytes;
+		dev->checkpt_xor ^= *data_bytes;
+
+		dev->checkpt_byte_offs++;
+		i++;
+		data_bytes++;
+		dev->checkpt_byte_count++;
+
+		if (dev->checkpt_byte_offs < 0 ||
+		    dev->checkpt_byte_offs >= (int)dev->data_bytes_per_chunk)
+			ok = yaffs2_checkpt_flush_buffer(dev);
+	}
+
+	return i;
+}
+
+int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes)
+{
+	int i = 0;
+	struct yaffs_ext_tags tags;
+	int chunk;
+	int offset_chunk;
+	u8 *data_bytes = (u8 *) data;
+
+	if (!dev->checkpt_buffer)
+		return 0;
+
+	if (dev->checkpt_open_write)
+		return -1;
+
+	while (i < n_bytes) {
+
+		if (dev->checkpt_byte_offs < 0 ||
+		    dev->checkpt_byte_offs >= (int)dev->data_bytes_per_chunk) {
+
+			if (dev->checkpt_cur_block < 0) {
+				yaffs2_checkpt_find_block(dev);
+				dev->checkpt_cur_chunk = 0;
+			}
+
+			/* Bail out if we can't find a checpoint block */
+			if (dev->checkpt_cur_block < 0)
+				break;
+
+			chunk = dev->checkpt_cur_block *
+			    dev->param.chunks_per_block +
+			    dev->checkpt_cur_chunk;
+
+			offset_chunk = apply_chunk_offset(dev, chunk);
+			dev->n_page_reads++;
+
+			/* Read in the next chunk */
+			dev->tagger.read_chunk_tags_fn(dev,
+						offset_chunk,
+						dev->checkpt_buffer,
+						&tags);
+
+			/* Bail out if the chunk is corrupted. */
+			if (tags.chunk_id != (u32)(dev->checkpt_page_seq + 1) ||
+			    tags.ecc_result > YAFFS_ECC_RESULT_FIXED ||
+			    tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA)
+				break;
+
+			/* Bail out if it is not a checkpoint chunk. */
+			if(!yaffs2_checkpt_check_chunk_hdr(dev))
+				break;
+
+			dev->checkpt_page_seq++;
+			dev->checkpt_cur_chunk++;
+
+			if (dev->checkpt_cur_chunk >=
+					(int)dev->param.chunks_per_block)
+				dev->checkpt_cur_block = -1;
+
+		}
+
+		*data_bytes = dev->checkpt_buffer[dev->checkpt_byte_offs];
+		dev->checkpt_sum += *data_bytes;
+		dev->checkpt_xor ^= *data_bytes;
+		dev->checkpt_byte_offs++;
+		i++;
+		data_bytes++;
+		dev->checkpt_byte_count++;
+	}
+
+	return i; /* Number of bytes read */
+}
+
+int yaffs_checkpt_close(struct yaffs_dev *dev)
+{
+	u32 i;
+
+	if (dev->checkpt_open_write) {
+		if (dev->checkpt_byte_offs !=
+			sizeof(sizeof(struct yaffs_checkpt_chunk_hdr)))
+			yaffs2_checkpt_flush_buffer(dev);
+	} else if (dev->checkpt_block_list) {
+		for (i = 0;
+		     i < dev->blocks_in_checkpt &&
+		     dev->checkpt_block_list[i] >= 0; i++) {
+			int blk = dev->checkpt_block_list[i];
+			struct yaffs_block_info *bi = NULL;
+
+			if ((int)dev->internal_start_block <= blk &&
+			    blk <= (int)dev->internal_end_block)
+				bi = yaffs_get_block_info(dev, blk);
+			if (bi && bi->block_state == YAFFS_BLOCK_STATE_EMPTY)
+				bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
+		}
+	}
+
+	dev->n_free_chunks -=
+		dev->blocks_in_checkpt * dev->param.chunks_per_block;
+	dev->n_erased_blocks -= dev->blocks_in_checkpt;
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT, "checkpoint byte count %d",
+		dev->checkpt_byte_count);
+
+	if (dev->checkpt_buffer)
+		return 1;
+	else
+		return 0;
+}
+
+int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev)
+{
+	/* Erase the checkpoint data */
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"checkpoint invalidate of %d blocks",
+		dev->blocks_in_checkpt);
+
+	return yaffs_checkpt_erase(dev);
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_checkptrw.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_checkptrw.h
--- linux-4.13.3/fs/yaffs2/yaffs_checkptrw.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_checkptrw.h	2018-01-10 15:09:56.573935500 +0800
@@ -0,0 +1,33 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_CHECKPTRW_H__
+#define __YAFFS_CHECKPTRW_H__
+
+#include "yaffs_guts.h"
+
+int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing);
+
+int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes);
+
+int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes);
+
+int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum);
+
+int yaffs_checkpt_close(struct yaffs_dev *dev);
+
+int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev);
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_ecc.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_ecc.c
--- linux-4.13.3/fs/yaffs2/yaffs_ecc.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_ecc.c	2018-01-10 15:09:56.521936926 +0800
@@ -0,0 +1,281 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This code implements the ECC algorithm used in SmartMedia.
+ *
+ * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
+ * The two unused bit are set to 1.
+ * The ECC can correct single bit errors in a 256-byte page of data. Thus, two
+ * such ECC blocks are used on a 512-byte NAND page.
+ *
+ */
+
+#include "yportenv.h"
+
+#include "yaffs_ecc.h"
+
+/* Table generated by gen-ecc.c
+ * Using a table means we do not have to calculate p1..p4 and p1'..p4'
+ * for each byte of data. These are instead provided in a table in bits7..2.
+ * Bit 0 of each entry indicates whether the entry has an odd or even parity,
+ * and therefore this bytes influence on the line parity.
+ */
+
+static const unsigned char column_parity_table[] = {
+	0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
+	0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
+	0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
+	0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
+	0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
+	0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
+	0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
+	0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
+	0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
+	0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
+	0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
+	0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
+	0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
+	0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
+	0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
+	0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
+	0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
+	0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
+	0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
+	0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
+	0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
+	0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
+	0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
+	0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
+	0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
+	0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
+	0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
+	0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
+	0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
+	0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
+	0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
+	0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
+};
+
+
+/* Calculate the ECC for a 256-byte block of data */
+void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc)
+{
+	unsigned int i;
+	unsigned char col_parity = 0;
+	unsigned char line_parity = 0;
+	unsigned char line_parity_prime = 0;
+	unsigned char t;
+	unsigned char b;
+
+	for (i = 0; i < 256; i++) {
+		b = column_parity_table[*data++];
+		col_parity ^= b;
+
+		if (b & 0x01) {	/* odd number of bits in the byte */
+			line_parity ^= i;
+			line_parity_prime ^= ~i;
+		}
+	}
+
+	ecc[2] = (~col_parity) | 0x03;
+
+	t = 0;
+	if (line_parity & 0x80)
+		t |= 0x80;
+	if (line_parity_prime & 0x80)
+		t |= 0x40;
+	if (line_parity & 0x40)
+		t |= 0x20;
+	if (line_parity_prime & 0x40)
+		t |= 0x10;
+	if (line_parity & 0x20)
+		t |= 0x08;
+	if (line_parity_prime & 0x20)
+		t |= 0x04;
+	if (line_parity & 0x10)
+		t |= 0x02;
+	if (line_parity_prime & 0x10)
+		t |= 0x01;
+	ecc[1] = ~t;
+
+	t = 0;
+	if (line_parity & 0x08)
+		t |= 0x80;
+	if (line_parity_prime & 0x08)
+		t |= 0x40;
+	if (line_parity & 0x04)
+		t |= 0x20;
+	if (line_parity_prime & 0x04)
+		t |= 0x10;
+	if (line_parity & 0x02)
+		t |= 0x08;
+	if (line_parity_prime & 0x02)
+		t |= 0x04;
+	if (line_parity & 0x01)
+		t |= 0x02;
+	if (line_parity_prime & 0x01)
+		t |= 0x01;
+	ecc[0] = ~t;
+
+}
+
+/* Correct the ECC on a 256 byte block of data */
+
+int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
+		      const unsigned char *test_ecc)
+{
+	unsigned char d0, d1, d2;	/* deltas */
+
+	d0 = read_ecc[0] ^ test_ecc[0];
+	d1 = read_ecc[1] ^ test_ecc[1];
+	d2 = read_ecc[2] ^ test_ecc[2];
+
+	if ((d0 | d1 | d2) == 0)
+		return 0;	/* no error */
+
+	if (((d0 ^ (d0 >> 1)) & 0x55) == 0x55 &&
+	    ((d1 ^ (d1 >> 1)) & 0x55) == 0x55 &&
+	    ((d2 ^ (d2 >> 1)) & 0x54) == 0x54) {
+		/* Single bit (recoverable) error in data */
+
+		unsigned byte;
+		unsigned bit;
+
+		bit = byte = 0;
+
+		if (d1 & 0x80)
+			byte |= 0x80;
+		if (d1 & 0x20)
+			byte |= 0x40;
+		if (d1 & 0x08)
+			byte |= 0x20;
+		if (d1 & 0x02)
+			byte |= 0x10;
+		if (d0 & 0x80)
+			byte |= 0x08;
+		if (d0 & 0x20)
+			byte |= 0x04;
+		if (d0 & 0x08)
+			byte |= 0x02;
+		if (d0 & 0x02)
+			byte |= 0x01;
+
+		if (d2 & 0x80)
+			bit |= 0x04;
+		if (d2 & 0x20)
+			bit |= 0x02;
+		if (d2 & 0x08)
+			bit |= 0x01;
+
+		data[byte] ^= (1 << bit);
+
+		return 1;	/* Corrected the error */
+	}
+
+	if ((hweight8(d0) + hweight8(d1) + hweight8(d2)) == 1) {
+		/* Reccoverable error in ecc */
+
+		read_ecc[0] = test_ecc[0];
+		read_ecc[1] = test_ecc[1];
+		read_ecc[2] = test_ecc[2];
+
+		return 1;	/* Corrected the error */
+	}
+
+	/* Unrecoverable error */
+
+	return -1;
+
+}
+
+/*
+ * ECCxxxOther does ECC calcs on arbitrary n bytes of data
+ */
+void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
+			  struct yaffs_ecc_other *ecc_other)
+{
+	unsigned int i;
+	unsigned char col_parity = 0;
+	unsigned line_parity = 0;
+	unsigned line_parity_prime = 0;
+	unsigned char b;
+
+	for (i = 0; i < n_bytes; i++) {
+		b = column_parity_table[*data++];
+		col_parity ^= b;
+
+		if (b & 0x01) {
+			/* odd number of bits in the byte */
+			line_parity ^= i;
+			line_parity_prime ^= ~i;
+		}
+
+	}
+
+	ecc_other->col_parity = (col_parity >> 2) & 0x3f;
+	ecc_other->line_parity = line_parity;
+	ecc_other->line_parity_prime = line_parity_prime;
+}
+
+int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
+			    struct yaffs_ecc_other *read_ecc,
+			    const struct yaffs_ecc_other *test_ecc)
+{
+	unsigned char delta_col;	/* column parity delta */
+	unsigned delta_line;	/* line parity delta */
+	unsigned delta_line_prime;	/* line parity delta */
+	unsigned bit;
+
+	delta_col = read_ecc->col_parity ^ test_ecc->col_parity;
+	delta_line = read_ecc->line_parity ^ test_ecc->line_parity;
+	delta_line_prime =
+	    read_ecc->line_parity_prime ^ test_ecc->line_parity_prime;
+
+	if ((delta_col | delta_line | delta_line_prime) == 0)
+		return 0;	/* no error */
+
+	if (delta_line == ~delta_line_prime &&
+	    (((delta_col ^ (delta_col >> 1)) & 0x15) == 0x15)) {
+		/* Single bit (recoverable) error in data */
+
+		bit = 0;
+
+		if (delta_col & 0x20)
+			bit |= 0x04;
+		if (delta_col & 0x08)
+			bit |= 0x02;
+		if (delta_col & 0x02)
+			bit |= 0x01;
+
+		if (delta_line >= n_bytes)
+			return -1;
+
+		data[delta_line] ^= (1 << bit);
+
+		return 1;	/* corrected */
+	}
+
+	if ((hweight32(delta_line) +
+	     hweight32(delta_line_prime) +
+	     hweight8(delta_col)) == 1) {
+		/* Reccoverable error in ecc */
+
+		*read_ecc = *test_ecc;
+		return 1;	/* corrected */
+	}
+
+	/* Unrecoverable error */
+
+	return -1;
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_ecc.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_ecc.h
--- linux-4.13.3/fs/yaffs2/yaffs_ecc.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_ecc.h	2018-01-10 15:09:56.573935500 +0800
@@ -0,0 +1,44 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * This code implements the ECC algorithm used in SmartMedia.
+ *
+ * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
+ * The two unused bit are set to 1.
+ * The ECC can correct single bit errors in a 256-byte page of data.
+ * Thus, two such ECC blocks are used on a 512-byte NAND page.
+ *
+ */
+
+#ifndef __YAFFS_ECC_H__
+#define __YAFFS_ECC_H__
+
+struct yaffs_ecc_other {
+	unsigned char col_parity;
+	unsigned line_parity;
+	unsigned line_parity_prime;
+};
+
+void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc);
+int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
+		      const unsigned char *test_ecc);
+
+void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
+			  struct yaffs_ecc_other *ecc);
+int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
+			    struct yaffs_ecc_other *read_ecc,
+			    const struct yaffs_ecc_other *test_ecc);
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_endian.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_endian.c
--- linux-4.13.3/fs/yaffs2/yaffs_endian.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_endian.c	2018-01-10 15:09:56.521936926 +0800
@@ -0,0 +1,106 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Endian processing functions.
+ */
+
+#include "yaffs_endian.h"
+#include "yaffs_guts.h"
+
+
+void yaffs_do_endian_u32(struct yaffs_dev *dev, u32 *val)
+{
+	if (!dev->swap_endian)
+		return;
+	*val = swap_u32(*val);
+}
+
+void yaffs_do_endian_s32(struct yaffs_dev *dev, s32 *val)
+{
+	if (!dev->swap_endian)
+		return;
+	*val = swap_s32(*val);
+}
+
+void yaffs_do_endian_oh(struct yaffs_dev *dev, struct yaffs_obj_hdr *oh)
+{
+	if (!dev->swap_endian)
+		return;
+	/* Change every field */
+	oh->type = swap_u32(oh->type);
+	oh->parent_obj_id = swap_u32(oh->parent_obj_id);
+
+	oh->yst_mode = swap_u32(oh->yst_mode);
+
+	oh->yst_uid = swap_u32(oh->yst_uid);
+	oh->yst_gid = swap_u32(oh->yst_gid);
+	oh->yst_atime = swap_u32(oh->yst_atime);
+	oh->yst_mtime = swap_u32(oh->yst_mtime);
+	oh->yst_ctime = swap_u32(oh->yst_ctime);
+
+	oh->file_size_low = swap_u32(oh->file_size_low);
+
+	oh->equiv_id = swap_u32(oh->equiv_id);
+
+	oh->yst_rdev = swap_u32(oh->yst_rdev);
+
+	oh->win_ctime[0] = swap_u32(oh->win_ctime[0]);
+	oh->win_ctime[1] = swap_u32(oh->win_ctime[1]);
+	oh->win_atime[0] = swap_u32(oh->win_atime[0]);
+	oh->win_atime[1] = swap_u32(oh->win_atime[1]);
+	oh->win_mtime[0] = swap_u32(oh->win_mtime[0]);
+	oh->win_mtime[1] = swap_u32(oh->win_mtime[1]);
+
+	oh->inband_shadowed_obj_id = swap_u32(oh->inband_shadowed_obj_id);
+	oh->inband_is_shrink = swap_u32(oh->inband_is_shrink);
+
+	oh->file_size_high = swap_u32(oh->file_size_high);
+	oh->reserved[0] = swap_u32(oh->reserved[0]);
+	oh->shadows_obj = swap_s32(oh->shadows_obj);
+
+	oh->is_shrink = swap_u32(oh->is_shrink);
+}
+
+
+void yaffs_do_endian_packed_tags2(struct yaffs_dev *dev,
+				struct yaffs_packed_tags2_tags_only *ptt)
+{
+	if (!dev->swap_endian)
+		return;
+	ptt->seq_number = swap_u32(ptt->seq_number);
+	ptt->obj_id = swap_u32(ptt->obj_id);
+	ptt->chunk_id = swap_u32(ptt->chunk_id);
+	ptt->n_bytes = swap_u32(ptt->n_bytes);
+}
+
+void yaffs_endian_config(struct yaffs_dev *dev)
+{
+	u32 x = 1;
+
+	if (dev->tnode_size < 1)
+		BUG();
+
+	dev->swap_endian = 0;
+
+	if (((char *)&x)[0] == 1) {
+		/* Little Endian. */
+		if (dev->param.stored_endian == 2 /* big endian */)
+			dev->swap_endian = 1;
+	} else  {
+		/* Big Endian. */
+		if (dev->param.stored_endian == 1 /* little endian */)
+			dev->swap_endian = 1;
+	}
+
+	if (dev->swap_endian)
+		dev->tn_swap_buffer = kmalloc(dev->tnode_size, GFP_NOFS);
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_endian.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_endian.h
--- linux-4.13.3/fs/yaffs2/yaffs_endian.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_endian.h	2018-01-10 15:09:56.573935500 +0800
@@ -0,0 +1,55 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_ENDIAN_H__
+#define __YAFFS_ENDIAN_H__
+#include "yaffs_guts.h"
+#include "yaffs_packedtags2.h"
+
+static inline u32 swap_u32(u32 val)
+{
+	return ((val >>24) & 0x000000ff) |
+	       ((val >> 8) & 0x0000ff00) |
+	       ((val << 8) & 0x00ff0000) |
+	       ((val <<24) & 0xff000000);
+}
+
+#define swap_s32(val) \
+	(s32)(swap_u32((u32)(val)))
+
+static inline loff_t swap_loff_t(loff_t lval)
+{
+	u32 vall = swap_u32(FSIZE_LOW(lval));
+	u32 valh;
+
+	if (sizeof(loff_t) == sizeof(u32))
+		return (loff_t) vall;
+
+	valh = swap_u32(FSIZE_HIGH(lval));
+
+	return FSIZE_COMBINE(vall, valh); /*NB: h and l are swapped. */
+}
+
+
+
+struct yaffs_dev;
+void yaffs_do_endian_s32(struct yaffs_dev *dev, s32 *val);
+void yaffs_do_endian_u32(struct yaffs_dev *dev, u32 *val);
+void yaffs_do_endian_oh(struct yaffs_dev *dev, struct yaffs_obj_hdr *oh);
+void yaffs_do_endian_packed_tags2(struct yaffs_dev *dev,
+				struct yaffs_packed_tags2_tags_only *ptt);
+void yaffs_endian_config(struct yaffs_dev *dev);
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_getblockinfo.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_getblockinfo.h
--- linux-4.13.3/fs/yaffs2/yaffs_getblockinfo.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_getblockinfo.h	2018-01-10 15:09:56.573935500 +0800
@@ -0,0 +1,36 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_GETBLOCKINFO_H__
+#define __YAFFS_GETBLOCKINFO_H__
+
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+
+/* Function to manipulate block info */
+static inline struct yaffs_block_info *yaffs_get_block_info(struct yaffs_dev
+							      *dev, int blk)
+{
+	if (blk < (int)dev->internal_start_block ||
+	    blk > (int)dev->internal_end_block) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"**>> yaffs: get_block_info block %d is not valid",
+			blk);
+		BUG();
+	}
+	return &dev->block_info[blk - dev->internal_start_block];
+}
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_guts.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_guts.c
--- linux-4.13.3/fs/yaffs2/yaffs_guts.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_guts.c	2018-01-10 15:09:56.529936707 +0800
@@ -0,0 +1,5215 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+
+#include "yaffs_guts.h"
+#include "yaffs_endian.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_tagscompat.h"
+#include "yaffs_tagsmarshall.h"
+#include "yaffs_nand.h"
+#include "yaffs_yaffs1.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_verify.h"
+#include "yaffs_nand.h"
+#include "yaffs_packedtags2.h"
+#include "yaffs_nameval.h"
+#include "yaffs_allocator.h"
+#include "yaffs_attribs.h"
+#include "yaffs_summary.h"
+
+/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
+#define YAFFS_GC_GOOD_ENOUGH 2
+#define YAFFS_GC_PASSIVE_THRESHOLD 4
+
+#include "yaffs_ecc.h"
+
+/* Forward declarations */
+
+static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
+			     const u8 *buffer, int n_bytes, int use_reserve);
+
+static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
+				int buffer_size);
+
+/* Function to calculate chunk and offset */
+
+void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
+				int *chunk_out, u32 *offset_out)
+{
+	int chunk;
+	u32 offset;
+
+	chunk = (u32) (addr >> dev->chunk_shift);
+
+	if (dev->chunk_div == 1) {
+		/* easy power of 2 case */
+		offset = (u32) (addr & dev->chunk_mask);
+	} else {
+		/* Non power-of-2 case */
+
+		loff_t chunk_base;
+
+		chunk /= dev->chunk_div;
+
+		chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
+		offset = (u32) (addr - chunk_base);
+	}
+
+	*chunk_out = chunk;
+	*offset_out = offset;
+}
+
+/* Function to return the number of shifts for a power of 2 greater than or
+ * equal to the given number
+ * Note we don't try to cater for all possible numbers and this does not have to
+ * be hellishly efficient.
+ */
+
+static inline u32 calc_shifts_ceiling(u32 x)
+{
+	int extra_bits;
+	int shifts;
+
+	shifts = extra_bits = 0;
+
+	while (x > 1) {
+		if (x & 1)
+			extra_bits++;
+		x >>= 1;
+		shifts++;
+	}
+
+	if (extra_bits)
+		shifts++;
+
+	return shifts;
+}
+
+/* Function to return the number of shifts to get a 1 in bit 0
+ */
+
+static inline u32 calc_shifts(u32 x)
+{
+	u32 shifts;
+
+	shifts = 0;
+
+	if (!x)
+		return 0;
+
+	while (!(x & 1)) {
+		x >>= 1;
+		shifts++;
+	}
+
+	return shifts;
+}
+
+/*
+ * Temporary buffer manipulations.
+ */
+
+static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
+{
+	int i;
+	u8 *buf = (u8 *) 1;
+
+	memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
+
+	for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
+		dev->temp_buffer[i].in_use = 0;
+		buf = kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
+		dev->temp_buffer[i].buffer = buf;
+	}
+
+	return buf ? YAFFS_OK : YAFFS_FAIL;
+}
+
+u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev)
+{
+	int i;
+
+	dev->temp_in_use++;
+	if (dev->temp_in_use > dev->max_temp)
+		dev->max_temp = dev->temp_in_use;
+
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+		if (dev->temp_buffer[i].in_use == 0) {
+			dev->temp_buffer[i].in_use = 1;
+			return dev->temp_buffer[i].buffer;
+		}
+	}
+
+	yaffs_trace(YAFFS_TRACE_BUFFERS, "Out of temp buffers");
+	/*
+	 * If we got here then we have to allocate an unmanaged one
+	 * This is not good.
+	 */
+
+	dev->unmanaged_buffer_allocs++;
+	return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
+
+}
+
+void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer)
+{
+	int i;
+
+	dev->temp_in_use--;
+
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+		if (dev->temp_buffer[i].buffer == buffer) {
+			dev->temp_buffer[i].in_use = 0;
+			return;
+		}
+	}
+
+	if (buffer) {
+		/* assume it is an unmanaged one. */
+		yaffs_trace(YAFFS_TRACE_BUFFERS,
+			"Releasing unmanaged temp buffer");
+		kfree(buffer);
+		dev->unmanaged_buffer_deallocs++;
+	}
+
+}
+
+/*
+ * Functions for robustisizing TODO
+ *
+ */
+
+static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
+				     const u8 *data,
+				     const struct yaffs_ext_tags *tags)
+{
+	(void) dev;
+	(void) nand_chunk;
+	(void) data;
+	(void) tags;
+}
+
+static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
+				      const struct yaffs_ext_tags *tags)
+{
+	(void) dev;
+	(void) nand_chunk;
+	(void) tags;
+}
+
+void yaffs_handle_chunk_error(struct yaffs_dev *dev,
+			      struct yaffs_block_info *bi)
+{
+	if (!bi->gc_prioritise) {
+		bi->gc_prioritise = 1;
+		dev->has_pending_prioritised_gc = 1;
+		bi->chunk_error_strikes++;
+
+		if (bi->chunk_error_strikes > 3) {
+			bi->needs_retiring = 1;	/* Too many stikes, so retire */
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"yaffs: Block struck out");
+
+		}
+	}
+}
+
+static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
+					int erased_ok)
+{
+	int flash_block = nand_chunk / dev->param.chunks_per_block;
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
+
+	yaffs_handle_chunk_error(dev, bi);
+
+	if (erased_ok) {
+		/* Was an actual write failure,
+		 * so mark the block for retirement.*/
+		bi->needs_retiring = 1;
+		yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+		  "**>> Block %d needs retiring", flash_block);
+	}
+
+	/* Delete the chunk */
+	yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+	yaffs_skip_rest_of_block(dev);
+}
+
+/*
+ * Verification code
+ */
+
+/*
+ *  Simple hash function. Needs to have a reasonable spread
+ */
+
+static inline int yaffs_hash_fn(int n)
+{
+	if (n < 0)
+		n = -n;
+	return n % YAFFS_NOBJECT_BUCKETS;
+}
+
+/*
+ * Access functions to useful fake objects.
+ * Note that root might have a presence in NAND if permissions are set.
+ */
+
+struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
+{
+	return dev->root_dir;
+}
+
+struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
+{
+	return dev->lost_n_found;
+}
+
+/*
+ *  Erased NAND checking functions
+ */
+
+int yaffs_check_ff(u8 *buffer, int n_bytes)
+{
+	/* Horrible, slow implementation */
+	while (n_bytes--) {
+		if (*buffer != 0xff)
+			return 0;
+		buffer++;
+	}
+	return 1;
+}
+
+static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
+{
+	int retval = YAFFS_OK;
+	u8 *data = yaffs_get_temp_buffer(dev);
+	struct yaffs_ext_tags tags;
+	int result;
+
+	result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
+
+	if (result == YAFFS_FAIL ||
+	    tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
+		retval = YAFFS_FAIL;
+
+	if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) ||
+		tags.chunk_used) {
+		yaffs_trace(YAFFS_TRACE_NANDACCESS,
+			"Chunk %d not erased", nand_chunk);
+		retval = YAFFS_FAIL;
+	}
+
+	yaffs_release_temp_buffer(dev, data);
+
+	return retval;
+
+}
+
+static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
+				      int nand_chunk,
+				      const u8 *data,
+				      struct yaffs_ext_tags *tags)
+{
+	int retval = YAFFS_OK;
+	struct yaffs_ext_tags temp_tags;
+	u8 *buffer = yaffs_get_temp_buffer(dev);
+	int result;
+
+	result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags);
+	if (result == YAFFS_FAIL ||
+	    memcmp(buffer, data, dev->data_bytes_per_chunk) ||
+	    temp_tags.obj_id != tags->obj_id ||
+	    temp_tags.chunk_id != tags->chunk_id ||
+	    temp_tags.n_bytes != tags->n_bytes)
+		retval = YAFFS_FAIL;
+
+	yaffs_release_temp_buffer(dev, buffer);
+
+	return retval;
+}
+
+
+int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
+{
+	int reserved_chunks;
+	int reserved_blocks = dev->param.n_reserved_blocks;
+	int checkpt_blocks;
+
+	checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
+
+	reserved_chunks =
+	    (reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block;
+
+	return (dev->n_free_chunks > (reserved_chunks + n_chunks));
+}
+
+static int yaffs_find_alloc_block(struct yaffs_dev *dev)
+{
+	u32 i;
+	struct yaffs_block_info *bi;
+
+	if (dev->n_erased_blocks < 1) {
+		/* Hoosterman we've got a problem.
+		 * Can't get space to gc
+		 */
+		yaffs_trace(YAFFS_TRACE_ERROR,
+		  "yaffs tragedy: no more erased blocks");
+
+		return -1;
+	}
+
+	/* Find an empty block. */
+
+	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		dev->alloc_block_finder++;
+		if (dev->alloc_block_finder < (int)dev->internal_start_block
+		    || dev->alloc_block_finder > (int)dev->internal_end_block) {
+			dev->alloc_block_finder = dev->internal_start_block;
+		}
+
+		bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
+
+		if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
+			bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
+			dev->seq_number++;
+			bi->seq_number = dev->seq_number;
+			dev->n_erased_blocks--;
+			yaffs_trace(YAFFS_TRACE_ALLOCATE,
+			  "Allocated block %d, seq  %d, %d left" ,
+			   dev->alloc_block_finder, dev->seq_number,
+			   dev->n_erased_blocks);
+			return dev->alloc_block_finder;
+		}
+	}
+
+	yaffs_trace(YAFFS_TRACE_ALWAYS,
+		"yaffs tragedy: no more erased blocks, but there should have been %d",
+		dev->n_erased_blocks);
+
+	return -1;
+}
+
+static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
+			     struct yaffs_block_info **block_ptr)
+{
+	int ret_val;
+	struct yaffs_block_info *bi;
+
+	if (dev->alloc_block < 0) {
+		/* Get next block to allocate off */
+		dev->alloc_block = yaffs_find_alloc_block(dev);
+		dev->alloc_page = 0;
+	}
+
+	if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
+		/* No space unless we're allowed to use the reserve. */
+		return -1;
+	}
+
+	if (dev->n_erased_blocks < (int)dev->param.n_reserved_blocks
+	    && dev->alloc_page == 0)
+		yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
+
+	/* Next page please.... */
+	if (dev->alloc_block >= 0) {
+		bi = yaffs_get_block_info(dev, dev->alloc_block);
+
+		ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
+		    dev->alloc_page;
+		bi->pages_in_use++;
+		yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
+
+		dev->alloc_page++;
+
+		dev->n_free_chunks--;
+
+		/* If the block is full set the state to full */
+		if (dev->alloc_page >= dev->param.chunks_per_block) {
+			bi->block_state = YAFFS_BLOCK_STATE_FULL;
+			dev->alloc_block = -1;
+		}
+
+		if (block_ptr)
+			*block_ptr = bi;
+
+		return ret_val;
+	}
+
+	yaffs_trace(YAFFS_TRACE_ERROR,
+		"!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
+
+	return -1;
+}
+
+static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
+{
+	int n;
+
+	n = dev->n_erased_blocks * dev->param.chunks_per_block;
+
+	if (dev->alloc_block > 0)
+		n += (dev->param.chunks_per_block - dev->alloc_page);
+
+	return n;
+
+}
+
+/*
+ * yaffs_skip_rest_of_block() skips over the rest of the allocation block
+ * if we don't want to write to it.
+ */
+void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
+{
+	struct yaffs_block_info *bi;
+
+	if (dev->alloc_block > 0) {
+		bi = yaffs_get_block_info(dev, dev->alloc_block);
+		if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
+			bi->block_state = YAFFS_BLOCK_STATE_FULL;
+			dev->alloc_block = -1;
+		}
+	}
+}
+
+static int yaffs_write_new_chunk(struct yaffs_dev *dev,
+				 const u8 *data,
+				 struct yaffs_ext_tags *tags, int use_reserver)
+{
+	u32 attempts = 0;
+	int write_ok = 0;
+	int chunk;
+
+	yaffs2_checkpt_invalidate(dev);
+
+	do {
+		struct yaffs_block_info *bi = 0;
+		int erased_ok = 0;
+
+		chunk = yaffs_alloc_chunk(dev, use_reserver, &bi);
+		if (chunk < 0) {
+			/* no space */
+			break;
+		}
+
+		/* First check this chunk is erased, if it needs
+		 * checking.  The checking policy (unless forced
+		 * always on) is as follows:
+		 *
+		 * Check the first page we try to write in a block.
+		 * If the check passes then we don't need to check any
+		 * more.        If the check fails, we check again...
+		 * If the block has been erased, we don't need to check.
+		 *
+		 * However, if the block has been prioritised for gc,
+		 * then we think there might be something odd about
+		 * this block and stop using it.
+		 *
+		 * Rationale: We should only ever see chunks that have
+		 * not been erased if there was a partially written
+		 * chunk due to power loss.  This checking policy should
+		 * catch that case with very few checks and thus save a
+		 * lot of checks that are most likely not needed.
+		 *
+		 * Mods to the above
+		 * If an erase check fails or the write fails we skip the
+		 * rest of the block.
+		 */
+
+		/* let's give it a try */
+		attempts++;
+
+		if (dev->param.always_check_erased)
+			bi->skip_erased_check = 0;
+
+		if (!bi->skip_erased_check) {
+			erased_ok = yaffs_check_chunk_erased(dev, chunk);
+			if (erased_ok != YAFFS_OK) {
+				yaffs_trace(YAFFS_TRACE_ERROR,
+				  "**>> yaffs chunk %d was not erased",
+				  chunk);
+
+				/* If not erased, delete this one,
+				 * skip rest of block and
+				 * try another chunk */
+				yaffs_chunk_del(dev, chunk, 1, __LINE__);
+				yaffs_skip_rest_of_block(dev);
+				continue;
+			}
+		}
+
+		write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
+
+		if (!bi->skip_erased_check)
+			write_ok =
+			    yaffs_verify_chunk_written(dev, chunk, data, tags);
+
+		if (write_ok != YAFFS_OK) {
+			/* Clean up aborted write, skip to next block and
+			 * try another chunk */
+			yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
+			continue;
+		}
+
+		bi->skip_erased_check = 1;
+
+		/* Copy the data into the robustification buffer */
+		yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
+
+	} while (write_ok != YAFFS_OK &&
+		 (yaffs_wr_attempts == 0 || attempts <= yaffs_wr_attempts));
+
+	if (!write_ok)
+		chunk = -1;
+
+	if (attempts > 1) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"**>> yaffs write required %d attempts",
+			attempts);
+		dev->n_retried_writes += (attempts - 1);
+	}
+
+	return chunk;
+}
+
+/*
+ * Block retiring for handling a broken block.
+ */
+
+static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
+{
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
+
+	yaffs2_checkpt_invalidate(dev);
+
+	yaffs2_clear_oldest_dirty_seq(dev, bi);
+
+	if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
+		if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"yaffs: Failed to mark bad and erase block %d",
+				flash_block);
+		} else {
+			struct yaffs_ext_tags tags;
+			int chunk_id =
+			    flash_block * dev->param.chunks_per_block;
+
+			u8 *buffer = yaffs_get_temp_buffer(dev);
+
+			memset(buffer, 0xff, dev->data_bytes_per_chunk);
+			memset(&tags, 0, sizeof(tags));
+			tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
+			if (dev->tagger.write_chunk_tags_fn(dev, chunk_id -
+							dev->chunk_offset,
+							buffer,
+							&tags) != YAFFS_OK)
+				yaffs_trace(YAFFS_TRACE_ALWAYS,
+					"yaffs: Failed to write bad block marker to block %d",
+					flash_block);
+
+			yaffs_release_temp_buffer(dev, buffer);
+		}
+	}
+
+	bi->block_state = YAFFS_BLOCK_STATE_DEAD;
+	bi->gc_prioritise = 0;
+	bi->needs_retiring = 0;
+
+	dev->n_retired_blocks++;
+}
+
+/*---------------- Name handling functions ------------*/
+
+static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR *name,
+				    const YCHAR *oh_name, int buff_size)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+	if (dev->param.auto_unicode) {
+		if (*oh_name) {
+			/* It is an ASCII name, do an ASCII to
+			 * unicode conversion */
+			const char *ascii_oh_name = (const char *)oh_name;
+			int n = buff_size - 1;
+			while (n > 0 && *ascii_oh_name) {
+				*name = *ascii_oh_name;
+				name++;
+				ascii_oh_name++;
+				n--;
+			}
+		} else {
+			strncpy(name, oh_name + 1, buff_size - 1);
+		}
+	} else {
+#else
+	(void) dev;
+	{
+#endif
+		strncpy(name, oh_name, buff_size - 1);
+	}
+}
+
+static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR *oh_name,
+				    const YCHAR *name)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+
+	int is_ascii;
+	const YCHAR *w;
+
+	if (dev->param.auto_unicode) {
+
+		is_ascii = 1;
+		w = name;
+
+		/* Figure out if the name will fit in ascii character set */
+		while (is_ascii && *w) {
+			if ((*w) & 0xff00)
+				is_ascii = 0;
+			w++;
+		}
+
+		if (is_ascii) {
+			/* It is an ASCII name, so convert unicode to ascii */
+			char *ascii_oh_name = (char *)oh_name;
+			int n = YAFFS_MAX_NAME_LENGTH - 1;
+			while (n > 0 && *name) {
+				*ascii_oh_name = *name;
+				name++;
+				ascii_oh_name++;
+				n--;
+			}
+		} else {
+			/* Unicode name, so save starting at the second YCHAR */
+			*oh_name = 0;
+			strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2);
+		}
+	} else {
+#else
+	dev = dev;
+	{
+#endif
+		strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
+	}
+}
+
+static u16 yaffs_calc_name_sum(const YCHAR *name)
+{
+	u16 sum = 0;
+	u16 i = 1;
+
+	if (!name)
+		return 0;
+
+	while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) {
+
+		/* 0x1f mask is case insensitive */
+		sum += ((*name) & 0x1f) * i;
+		i++;
+		name++;
+	}
+	return sum;
+}
+
+
+void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
+{
+	memset(obj->short_name, 0, sizeof(obj->short_name));
+
+	if (name && !name[0]) {
+		yaffs_fix_null_name(obj, obj->short_name,
+				YAFFS_SHORT_NAME_LENGTH);
+		name = obj->short_name;
+	} else if (name &&
+		strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
+		YAFFS_SHORT_NAME_LENGTH)  {
+		strcpy(obj->short_name, name);
+	}
+
+	obj->sum = yaffs_calc_name_sum(name);
+}
+
+void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
+				const struct yaffs_obj_hdr *oh)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+	YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1];
+	memset(tmp_name, 0, sizeof(tmp_name));
+	yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name,
+				YAFFS_MAX_NAME_LENGTH + 1);
+	yaffs_set_obj_name(obj, tmp_name);
+#else
+	yaffs_set_obj_name(obj, oh->name);
+#endif
+}
+
+loff_t yaffs_max_file_size(struct yaffs_dev *dev)
+{
+	if (sizeof(loff_t) < 8)
+		return YAFFS_MAX_FILE_SIZE_32;
+	else
+		return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk;
+}
+
+/*-------------------- TNODES -------------------
+
+ * List of spare tnodes
+ * The list is hooked together using the first pointer
+ * in the tnode.
+ */
+
+struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
+{
+	struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
+
+	if (tn) {
+		memset(tn, 0, dev->tnode_size);
+		dev->n_tnodes++;
+	}
+
+	dev->checkpoint_blocks_required = 0;	/* force recalculation */
+
+	return tn;
+}
+
+/* FreeTnode frees up a tnode and puts it back on the free list */
+static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
+{
+	yaffs_free_raw_tnode(dev, tn);
+	dev->n_tnodes--;
+	dev->checkpoint_blocks_required = 0;	/* force recalculation */
+}
+
+static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
+{
+	yaffs_deinit_raw_tnodes_and_objs(dev);
+	dev->n_obj = 0;
+	dev->n_tnodes = 0;
+}
+
+static void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+			unsigned pos, unsigned val)
+{
+	u32 *map = (u32 *) tn;
+	u32 bit_in_map;
+	u32 bit_in_word;
+	u32 word_in_map;
+	u32 mask;
+
+	pos &= YAFFS_TNODES_LEVEL0_MASK;
+	val >>= dev->chunk_grp_bits;
+
+	bit_in_map = pos * dev->tnode_width;
+	word_in_map = bit_in_map / 32;
+	bit_in_word = bit_in_map & (32 - 1);
+
+	mask = dev->tnode_mask << bit_in_word;
+
+	map[word_in_map] &= ~mask;
+	map[word_in_map] |= (mask & (val << bit_in_word));
+
+	if (dev->tnode_width > (32 - bit_in_word)) {
+		bit_in_word = (32 - bit_in_word);
+		word_in_map++;
+		mask =
+		    dev->tnode_mask >> bit_in_word;
+		map[word_in_map] &= ~mask;
+		map[word_in_map] |= (mask & (val >> bit_in_word));
+	}
+}
+
+u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+			 unsigned pos)
+{
+	u32 *map = (u32 *) tn;
+	u32 bit_in_map;
+	u32 bit_in_word;
+	u32 word_in_map;
+	u32 val;
+
+	pos &= YAFFS_TNODES_LEVEL0_MASK;
+
+	bit_in_map = pos * dev->tnode_width;
+	word_in_map = bit_in_map / 32;
+	bit_in_word = bit_in_map & (32 - 1);
+
+	val = map[word_in_map] >> bit_in_word;
+
+	if (dev->tnode_width > (32 - bit_in_word)) {
+		bit_in_word = (32 - bit_in_word);
+		word_in_map++;
+		val |= (map[word_in_map] << bit_in_word);
+	}
+
+	val &= dev->tnode_mask;
+	val <<= dev->chunk_grp_bits;
+
+	return val;
+}
+
+/* ------------------- End of individual tnode manipulation -----------------*/
+
+/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
+ * The look up tree is represented by the top tnode and the number of top_level
+ * in the tree. 0 means only the level 0 tnode is in the tree.
+ */
+
+/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
+struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
+				       struct yaffs_file_var *file_struct,
+				       u32 chunk_id)
+{
+	struct yaffs_tnode *tn = file_struct->top;
+	u32 i;
+	int required_depth;
+	int level = file_struct->top_level;
+
+	(void) dev;
+
+	/* Check sane level and chunk Id */
+	if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
+		return NULL;
+
+	if (chunk_id > YAFFS_MAX_CHUNK_ID)
+		return NULL;
+
+	/* First check we're tall enough (ie enough top_level) */
+
+	i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
+	required_depth = 0;
+	while (i) {
+		i >>= YAFFS_TNODES_INTERNAL_BITS;
+		required_depth++;
+	}
+
+	if (required_depth > file_struct->top_level)
+		return NULL;	/* Not tall enough, so we can't find it */
+
+	/* Traverse down to level 0 */
+	while (level > 0 && tn) {
+		tn = tn->internal[(chunk_id >>
+				   (YAFFS_TNODES_LEVEL0_BITS +
+				    (level - 1) *
+				    YAFFS_TNODES_INTERNAL_BITS)) &
+				  YAFFS_TNODES_INTERNAL_MASK];
+		level--;
+	}
+
+	return tn;
+}
+
+/* add_find_tnode_0 finds the level 0 tnode if it exists,
+ * otherwise first expands the tree.
+ * This happens in two steps:
+ *  1. If the tree isn't tall enough, then make it taller.
+ *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
+ *
+ * Used when modifying the tree.
+ *
+ *  If the tn argument is NULL, then a fresh tnode will be added otherwise the
+ *  specified tn will be plugged into the ttree.
+ */
+
+struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
+					   struct yaffs_file_var *file_struct,
+					   u32 chunk_id,
+					   struct yaffs_tnode *passed_tn)
+{
+	int required_depth;
+	int i;
+	int l;
+	struct yaffs_tnode *tn;
+	u32 x;
+
+	/* Check sane level and page Id */
+	if (file_struct->top_level < 0 ||
+	    file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
+		return NULL;
+
+	if (chunk_id > YAFFS_MAX_CHUNK_ID)
+		return NULL;
+
+	/* First check we're tall enough (ie enough top_level) */
+
+	x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
+	required_depth = 0;
+	while (x) {
+		x >>= YAFFS_TNODES_INTERNAL_BITS;
+		required_depth++;
+	}
+
+	if (required_depth > file_struct->top_level) {
+		/* Not tall enough, gotta make the tree taller */
+		for (i = file_struct->top_level; i < required_depth; i++) {
+
+			tn = yaffs_get_tnode(dev);
+
+			if (tn) {
+				tn->internal[0] = file_struct->top;
+				file_struct->top = tn;
+				file_struct->top_level++;
+			} else {
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"yaffs: no more tnodes");
+				return NULL;
+			}
+		}
+	}
+
+	/* Traverse down to level 0, adding anything we need */
+
+	l = file_struct->top_level;
+	tn = file_struct->top;
+
+	if (l > 0) {
+		while (l > 0 && tn) {
+			x = (chunk_id >>
+			     (YAFFS_TNODES_LEVEL0_BITS +
+			      (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
+			    YAFFS_TNODES_INTERNAL_MASK;
+
+			if ((l > 1) && !tn->internal[x]) {
+				/* Add missing non-level-zero tnode */
+				tn->internal[x] = yaffs_get_tnode(dev);
+				if (!tn->internal[x])
+					return NULL;
+			} else if (l == 1) {
+				/* Looking from level 1 at level 0 */
+				if (passed_tn) {
+					/* If we already have one, release it */
+					if (tn->internal[x])
+						yaffs_free_tnode(dev,
+							tn->internal[x]);
+					tn->internal[x] = passed_tn;
+
+				} else if (!tn->internal[x]) {
+					/* Don't have one, none passed in */
+					tn->internal[x] = yaffs_get_tnode(dev);
+					if (!tn->internal[x])
+						return NULL;
+				}
+			}
+
+			tn = tn->internal[x];
+			l--;
+		}
+	} else {
+		/* top is level 0 */
+		if (passed_tn) {
+			memcpy(tn, passed_tn,
+			       (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
+			yaffs_free_tnode(dev, passed_tn);
+		}
+	}
+
+	return tn;
+}
+
+static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
+			    int chunk_obj)
+{
+	return (tags->chunk_id == (u32)chunk_obj &&
+		tags->obj_id == (u32)obj_id &&
+		!tags->is_deleted) ? 1 : 0;
+
+}
+
+static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
+					struct yaffs_ext_tags *tags, int obj_id,
+					int inode_chunk)
+{
+	int j;
+
+	for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) {
+		if (yaffs_check_chunk_bit
+		    (dev, the_chunk / dev->param.chunks_per_block,
+		     the_chunk % dev->param.chunks_per_block)) {
+
+			if (dev->chunk_grp_size == 1)
+				return the_chunk;
+			else {
+				yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
+							 tags);
+				if (yaffs_tags_match(tags,
+							obj_id, inode_chunk)) {
+					/* found it; */
+					return the_chunk;
+				}
+			}
+		}
+		the_chunk++;
+	}
+	return -1;
+}
+
+int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+				    struct yaffs_ext_tags *tags)
+{
+	/*Get the Tnode, then get the level 0 offset chunk offset */
+	struct yaffs_tnode *tn;
+	int the_chunk = -1;
+	struct yaffs_ext_tags local_tags;
+	int ret_val = -1;
+	struct yaffs_dev *dev = in->my_dev;
+
+	if (!tags) {
+		/* Passed a NULL, so use our own tags space */
+		tags = &local_tags;
+	}
+
+	tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
+
+	if (!tn)
+		return ret_val;
+
+	the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+	ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+					      inode_chunk);
+	return ret_val;
+}
+
+static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
+				     struct yaffs_ext_tags *tags)
+{
+	/* Get the Tnode, then get the level 0 offset chunk offset */
+	struct yaffs_tnode *tn;
+	int the_chunk = -1;
+	struct yaffs_ext_tags local_tags;
+	struct yaffs_dev *dev = in->my_dev;
+	int ret_val = -1;
+
+	if (!tags) {
+		/* Passed a NULL, so use our own tags space */
+		tags = &local_tags;
+	}
+
+	tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
+
+	if (!tn)
+		return ret_val;
+
+	the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+	ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
+					      inode_chunk);
+
+	/* Delete the entry in the filestructure (if found) */
+	if (ret_val != -1)
+		yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
+
+	return ret_val;
+}
+
+int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+			    int nand_chunk, int in_scan)
+{
+	/* NB in_scan is zero unless scanning.
+	 * For forward scanning, in_scan is > 0;
+	 * for backward scanning in_scan is < 0
+	 *
+	 * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
+	 */
+
+	struct yaffs_tnode *tn;
+	struct yaffs_dev *dev = in->my_dev;
+	int existing_cunk;
+	struct yaffs_ext_tags existing_tags;
+	struct yaffs_ext_tags new_tags;
+	unsigned existing_serial, new_serial;
+
+	if (in->variant_type != YAFFS_OBJECT_TYPE_FILE) {
+		/* Just ignore an attempt at putting a chunk into a non-file
+		 * during scanning.
+		 * If it is not during Scanning then something went wrong!
+		 */
+		if (!in_scan) {
+			yaffs_trace(YAFFS_TRACE_ERROR,
+				"yaffs tragedy:attempt to put data chunk into a non-file"
+				);
+			BUG();
+		}
+
+		yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+		return YAFFS_OK;
+	}
+
+	tn = yaffs_add_find_tnode_0(dev,
+				    &in->variant.file_variant,
+				    inode_chunk, NULL);
+	if (!tn)
+		return YAFFS_FAIL;
+
+	if (!nand_chunk)
+		/* Dummy insert, bail now */
+		return YAFFS_OK;
+
+	existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
+
+	if (in_scan != 0) {
+		/* If we're scanning then we need to test for duplicates
+		 * NB This does not need to be efficient since it should only
+		 * happen when the power fails during a write, then only one
+		 * chunk should ever be affected.
+		 *
+		 * Correction for YAFFS2: This could happen quite a lot and we
+		 * need to think about efficiency! TODO
+		 * Update: For backward scanning we don't need to re-read tags
+		 * so this is quite cheap.
+		 */
+
+		if (existing_cunk > 0) {
+			/* NB Right now existing chunk will not be real
+			 * chunk_id if the chunk group size > 1
+			 * thus we have to do a FindChunkInFile to get the
+			 * real chunk id.
+			 *
+			 * We have a duplicate now we need to decide which
+			 * one to use:
+			 *
+			 * Backwards scanning YAFFS2: The old one is what
+			 * we use, dump the new one.
+			 * YAFFS1: Get both sets of tags and compare serial
+			 * numbers.
+			 */
+
+			if (in_scan > 0) {
+				/* Only do this for forward scanning */
+				yaffs_rd_chunk_tags_nand(dev,
+							 nand_chunk,
+							 NULL, &new_tags);
+
+				/* Do a proper find */
+				existing_cunk =
+				    yaffs_find_chunk_in_file(in, inode_chunk,
+							     &existing_tags);
+			}
+
+			if (existing_cunk <= 0) {
+				/*Hoosterman - how did this happen? */
+
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"yaffs tragedy: existing chunk < 0 in scan"
+					);
+
+			}
+
+			/* NB The deleted flags should be false, otherwise
+			 * the chunks will not be loaded during a scan
+			 */
+
+			if (in_scan > 0) {
+				new_serial = new_tags.serial_number;
+				existing_serial = existing_tags.serial_number;
+			}
+
+			if ((in_scan > 0) &&
+			    (existing_cunk <= 0 ||
+			     ((existing_serial + 1) & 3) == new_serial)) {
+				/* Forward scanning.
+				 * Use new
+				 * Delete the old one and drop through to
+				 * update the tnode
+				 */
+				yaffs_chunk_del(dev, existing_cunk, 1,
+						__LINE__);
+			} else {
+				/* Backward scanning or we want to use the
+				 * existing one
+				 * Delete the new one and return early so that
+				 * the tnode isn't changed
+				 */
+				yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
+				return YAFFS_OK;
+			}
+		}
+
+	}
+
+	if (existing_cunk == 0)
+		in->n_data_chunks++;
+
+	yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
+
+	return YAFFS_OK;
+}
+
+static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
+{
+	struct yaffs_block_info *the_block;
+	unsigned block_no;
+
+	yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk);
+
+	block_no = chunk / dev->param.chunks_per_block;
+	the_block = yaffs_get_block_info(dev, block_no);
+	if (the_block) {
+		the_block->soft_del_pages++;
+		dev->n_free_chunks++;
+		yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
+	}
+}
+
+/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all
+ * the chunks in the file.
+ * All soft deleting does is increment the block's softdelete count and pulls
+ * the chunk out of the tnode.
+ * Thus, essentially this is the same as DeleteWorker except that the chunks
+ * are soft deleted.
+ */
+
+static int yaffs_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
+				 u32 level, int chunk_offset)
+{
+	int i;
+	int the_chunk;
+	int all_done = 1;
+	struct yaffs_dev *dev = in->my_dev;
+
+	if (!tn)
+		return 1;
+
+	if (level > 0) {
+		for (i = YAFFS_NTNODES_INTERNAL - 1;
+			all_done && i >= 0;
+			i--) {
+			if (tn->internal[i]) {
+				all_done =
+				    yaffs_soft_del_worker(in,
+					tn->internal[i],
+					level - 1,
+					(chunk_offset <<
+					YAFFS_TNODES_INTERNAL_BITS)
+					+ i);
+				if (all_done) {
+					yaffs_free_tnode(dev,
+						tn->internal[i]);
+					tn->internal[i] = NULL;
+				} else {
+					/* Can this happen? */
+				}
+			}
+		}
+		return (all_done) ? 1 : 0;
+	}
+
+	/* level 0 */
+	 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
+		the_chunk = yaffs_get_group_base(dev, tn, i);
+		if (the_chunk) {
+			yaffs_soft_del_chunk(dev, the_chunk);
+			yaffs_load_tnode_0(dev, tn, i, 0);
+		}
+	}
+	return 1;
+}
+
+static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
+{
+	struct yaffs_dev *dev = obj->my_dev;
+	struct yaffs_obj *parent;
+
+	yaffs_verify_obj_in_dir(obj);
+	parent = obj->parent;
+
+	yaffs_verify_dir(parent);
+
+	if (dev && dev->param.remove_obj_fn)
+		dev->param.remove_obj_fn(obj);
+
+	list_del_init(&obj->siblings);
+	obj->parent = NULL;
+
+	yaffs_verify_dir(parent);
+}
+
+void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
+{
+	if (!directory) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"tragedy: Trying to add an object to a null pointer directory"
+			);
+		BUG();
+		return;
+	}
+	if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"tragedy: Trying to add an object to a non-directory"
+			);
+		BUG();
+	}
+
+	if (obj->siblings.prev == NULL) {
+		/* Not initialised */
+		BUG();
+	}
+
+	yaffs_verify_dir(directory);
+
+	yaffs_remove_obj_from_dir(obj);
+
+	/* Now add it */
+	list_add(&obj->siblings, &directory->variant.dir_variant.children);
+	obj->parent = directory;
+
+	if (directory == obj->my_dev->unlinked_dir
+	    || directory == obj->my_dev->del_dir) {
+		obj->unlinked = 1;
+		obj->my_dev->n_unlinked_files++;
+		obj->rename_allowed = 0;
+	}
+
+	yaffs_verify_dir(directory);
+	yaffs_verify_obj_in_dir(obj);
+}
+
+static int yaffs_change_obj_name(struct yaffs_obj *obj,
+				 struct yaffs_obj *new_dir,
+				 const YCHAR *new_name, int force, int shadows)
+{
+	int unlink_op;
+	int del_op;
+	struct yaffs_obj *existing_target;
+
+	if (new_dir == NULL)
+		new_dir = obj->parent;	/* use the old directory */
+
+	if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"tragedy: yaffs_change_obj_name: new_dir is not a directory"
+			);
+		BUG();
+	}
+
+	unlink_op = (new_dir == obj->my_dev->unlinked_dir);
+	del_op = (new_dir == obj->my_dev->del_dir);
+
+	existing_target = yaffs_find_by_name(new_dir, new_name);
+
+	/* If the object is a file going into the unlinked directory,
+	 *   then it is OK to just stuff it in since duplicate names are OK.
+	 *   else only proceed if the new name does not exist and we're putting
+	 *   it into a directory.
+	 */
+	if (!(unlink_op || del_op || force ||
+	      shadows > 0 || !existing_target) ||
+	      new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+		return YAFFS_FAIL;
+
+	yaffs_set_obj_name(obj, new_name);
+	obj->dirty = 1;
+	yaffs_add_obj_to_dir(new_dir, obj);
+
+	if (unlink_op)
+		obj->unlinked = 1;
+
+	/* If it is a deletion then we mark it as a shrink for gc  */
+	if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= 0)
+		return YAFFS_OK;
+
+	return YAFFS_FAIL;
+}
+
+/*------------------------ Short Operations Cache ------------------------------
+ *   In many situations where there is no high level buffering  a lot of
+ *   reads might be short sequential reads, and a lot of writes may be short
+ *   sequential writes. eg. scanning/writing a jpeg file.
+ *   In these cases, a short read/write cache can provide a huge perfomance
+ *   benefit with dumb-as-a-rock code.
+ *   In Linux, the page cache provides read buffering and the short op cache
+ *   provides write buffering.
+ *
+ *   There are a small number (~10) of cache chunks per device so that we don't
+ *   need a very intelligent search.
+ */
+
+static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
+{
+	struct yaffs_dev *dev = obj->my_dev;
+	int i;
+	struct yaffs_cache *cache;
+	int n_caches = obj->my_dev->param.n_caches;
+
+	for (i = 0; i < n_caches; i++) {
+		cache = &dev->cache[i];
+		if (cache->object == obj && cache->dirty)
+			return 1;
+	}
+
+	return 0;
+}
+
+static void yaffs_flush_single_cache(struct yaffs_cache *cache, int discard)
+{
+
+	if (!cache || cache->locked)
+		return;
+
+	/* Write it out and free it up  if need be.*/
+	if (cache->dirty) {
+		yaffs_wr_data_obj(cache->object,
+				  cache->chunk_id,
+				  cache->data,
+				  cache->n_bytes,
+				  1);
+
+		cache->dirty = 0;
+	}
+
+	if (discard)
+		cache->object = NULL;
+}
+
+static void yaffs_flush_file_cache(struct yaffs_obj *obj, int discard)
+{
+	struct yaffs_dev *dev = obj->my_dev;
+	int i;
+	struct yaffs_cache *cache;
+	int n_caches = obj->my_dev->param.n_caches;
+
+	if (n_caches < 1)
+		return;
+
+
+	/* Find the chunks for this object and flush them. */
+	for (i = 0; i < n_caches; i++) {
+		cache = &dev->cache[i];
+		if (cache->object == obj)
+			yaffs_flush_single_cache(cache, discard);
+	}
+
+}
+
+
+void yaffs_flush_whole_cache(struct yaffs_dev *dev, int discard)
+{
+	struct yaffs_obj *obj;
+	int n_caches = dev->param.n_caches;
+	int i;
+
+	/* Find a dirty object in the cache and flush it...
+	 * until there are no further dirty objects.
+	 */
+	do {
+		obj = NULL;
+		for (i = 0; i < n_caches && !obj; i++) {
+			if (dev->cache[i].object && dev->cache[i].dirty)
+				obj = dev->cache[i].object;
+		}
+		if (obj)
+			yaffs_flush_file_cache(obj, discard);
+	} while (obj);
+
+}
+
+/* Grab us an unused cache chunk for use.
+ * First look for an empty one.
+ * Then look for the least recently used non-dirty one.
+ * Then look for the least recently used dirty one...., flush and look again.
+ */
+static struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
+{
+	u32 i;
+
+	if (dev->param.n_caches > 0) {
+		for (i = 0; i < dev->param.n_caches; i++) {
+			if (!dev->cache[i].object)
+				return &dev->cache[i];
+		}
+	}
+
+	return NULL;
+}
+
+static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
+{
+	struct yaffs_cache *cache;
+	int usage;
+	u32 i;
+
+	if (dev->param.n_caches < 1)
+		return NULL;
+
+	/* First look for an unused cache */
+
+	cache = yaffs_grab_chunk_worker(dev);
+
+	if (cache)
+		return cache;
+
+	/*
+	 * Thery were all in use.
+	 * Find the LRU cache and flush it if it is dirty.
+	 */
+
+	usage = -1;
+	cache = NULL;
+
+	for (i = 0; i < dev->param.n_caches; i++) {
+		if (dev->cache[i].object &&
+		    !dev->cache[i].locked &&
+		    (dev->cache[i].last_use < usage || !cache)) {
+				usage = dev->cache[i].last_use;
+				cache = &dev->cache[i];
+		}
+	}
+
+#if 1
+	yaffs_flush_single_cache(cache, 1);
+#else
+	yaffs_flush_file_cache(cache->object, 1);
+	cache = yaffs_grab_chunk_worker(dev);
+#endif
+
+	return cache;
+}
+
+/* Find a cached chunk */
+static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
+						  int chunk_id)
+{
+	struct yaffs_dev *dev = obj->my_dev;
+	u32 i;
+
+	if (dev->param.n_caches < 1)
+		return NULL;
+
+	for (i = 0; i < dev->param.n_caches; i++) {
+		if (dev->cache[i].object == obj &&
+		    dev->cache[i].chunk_id == chunk_id) {
+			dev->cache_hits++;
+
+			return &dev->cache[i];
+		}
+	}
+	return NULL;
+}
+
+/* Mark the chunk for the least recently used algorithym */
+static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
+			    int is_write)
+{
+	u32 i;
+
+	if (dev->param.n_caches < 1)
+		return;
+
+	if (dev->cache_last_use < 0 ||
+		dev->cache_last_use > 100000000) {
+		/* Reset the cache usages */
+		for (i = 1; i < dev->param.n_caches; i++)
+			dev->cache[i].last_use = 0;
+
+		dev->cache_last_use = 0;
+	}
+	dev->cache_last_use++;
+	cache->last_use = dev->cache_last_use;
+
+	if (is_write)
+		cache->dirty = 1;
+}
+
+/* Invalidate a single cache page.
+ * Do this when a whole page gets written,
+ * ie the short cache for this page is no longer valid.
+ */
+static void yaffs_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
+{
+	struct yaffs_cache *cache;
+
+	if (object->my_dev->param.n_caches > 0) {
+		cache = yaffs_find_chunk_cache(object, chunk_id);
+
+		if (cache)
+			cache->object = NULL;
+	}
+}
+
+/* Invalidate all the cache pages associated with this object
+ * Do this whenever ther file is deleted or resized.
+ */
+static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
+{
+	u32 i;
+	struct yaffs_dev *dev = in->my_dev;
+
+	if (dev->param.n_caches > 0) {
+		/* Invalidate it. */
+		for (i = 0; i < dev->param.n_caches; i++) {
+			if (dev->cache[i].object == in)
+				dev->cache[i].object = NULL;
+		}
+	}
+}
+
+static void yaffs_unhash_obj(struct yaffs_obj *obj)
+{
+	int bucket;
+	struct yaffs_dev *dev = obj->my_dev;
+
+	/* If it is still linked into the bucket list, free from the list */
+	if (!list_empty(&obj->hash_link)) {
+		list_del_init(&obj->hash_link);
+		bucket = yaffs_hash_fn(obj->obj_id);
+		dev->obj_bucket[bucket].count--;
+	}
+}
+
+/*  FreeObject frees up a Object and puts it back on the free list */
+static void yaffs_free_obj(struct yaffs_obj *obj)
+{
+	struct yaffs_dev *dev;
+
+	if (!obj) {
+		BUG();
+		return;
+	}
+	dev = obj->my_dev;
+	yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p",
+		obj, obj->my_inode);
+	if (obj->parent)
+		BUG();
+	if (!list_empty(&obj->siblings))
+		BUG();
+
+	if (obj->my_inode) {
+		/* We're still hooked up to a cached inode.
+		 * Don't delete now, but mark for later deletion
+		 */
+		obj->defered_free = 1;
+		return;
+	}
+
+	yaffs_unhash_obj(obj);
+
+	yaffs_free_raw_obj(dev, obj);
+	dev->n_obj--;
+	dev->checkpoint_blocks_required = 0;	/* force recalculation */
+}
+
+void yaffs_handle_defered_free(struct yaffs_obj *obj)
+{
+	if (obj->defered_free)
+		yaffs_free_obj(obj);
+}
+
+static int yaffs_generic_obj_del(struct yaffs_obj *in)
+{
+	/* Iinvalidate the file's data in the cache, without flushing. */
+	yaffs_invalidate_whole_cache(in);
+
+	if (in->my_dev->param.is_yaffs2 && in->parent != in->my_dev->del_dir) {
+		/* Move to unlinked directory so we have a deletion record */
+		yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
+				      0);
+	}
+
+	yaffs_remove_obj_from_dir(in);
+	yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
+	in->hdr_chunk = 0;
+
+	yaffs_free_obj(in);
+	return YAFFS_OK;
+
+}
+
+static void yaffs_soft_del_file(struct yaffs_obj *obj)
+{
+	if (!obj->deleted ||
+	    obj->variant_type != YAFFS_OBJECT_TYPE_FILE ||
+	    obj->soft_del)
+		return;
+
+	if (obj->n_data_chunks <= 0) {
+		/* Empty file with no duplicate object headers,
+		 * just delete it immediately */
+		yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top);
+		obj->variant.file_variant.top = NULL;
+		yaffs_trace(YAFFS_TRACE_TRACING,
+			"yaffs: Deleting empty file %d",
+			obj->obj_id);
+		yaffs_generic_obj_del(obj);
+	} else {
+		yaffs_soft_del_worker(obj,
+				      obj->variant.file_variant.top,
+				      obj->variant.
+				      file_variant.top_level, 0);
+		obj->soft_del = 1;
+	}
+}
+
+/* Pruning removes any part of the file structure tree that is beyond the
+ * bounds of the file (ie that does not point to chunks).
+ *
+ * A file should only get pruned when its size is reduced.
+ *
+ * Before pruning, the chunks must be pulled from the tree and the
+ * level 0 tnode entries must be zeroed out.
+ * Could also use this for file deletion, but that's probably better handled
+ * by a special case.
+ *
+ * This function is recursive. For levels > 0 the function is called again on
+ * any sub-tree. For level == 0 we just check if the sub-tree has data.
+ * If there is no data in a subtree then it is pruned.
+ */
+
+static struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
+					      struct yaffs_tnode *tn, u32 level,
+					      int del0)
+{
+	int i;
+	int has_data;
+
+	if (!tn)
+		return tn;
+
+	has_data = 0;
+
+	if (level > 0) {
+		for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
+			if (tn->internal[i]) {
+				tn->internal[i] =
+				    yaffs_prune_worker(dev,
+						tn->internal[i],
+						level - 1,
+						(i == 0) ? del0 : 1);
+			}
+
+			if (tn->internal[i])
+				has_data++;
+		}
+	} else {
+		int tnode_size_u32 = dev->tnode_size / sizeof(u32);
+		u32 *map = (u32 *) tn;
+
+		for (i = 0; !has_data && i < tnode_size_u32; i++) {
+			if (map[i])
+				has_data++;
+		}
+	}
+
+	if (has_data == 0 && del0) {
+		/* Free and return NULL */
+		yaffs_free_tnode(dev, tn);
+		tn = NULL;
+	}
+	return tn;
+}
+
+static int yaffs_prune_tree(struct yaffs_dev *dev,
+			    struct yaffs_file_var *file_struct)
+{
+	int i;
+	int has_data;
+	int done = 0;
+	struct yaffs_tnode *tn;
+
+	if (file_struct->top_level < 1)
+		return YAFFS_OK;
+
+	file_struct->top =
+	   yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 0);
+
+	/* Now we have a tree with all the non-zero branches NULL but
+	 * the height is the same as it was.
+	 * Let's see if we can trim internal tnodes to shorten the tree.
+	 * We can do this if only the 0th element in the tnode is in use
+	 * (ie all the non-zero are NULL)
+	 */
+
+	while (file_struct->top_level && !done) {
+		tn = file_struct->top;
+
+		has_data = 0;
+		for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
+			if (tn->internal[i])
+				has_data++;
+		}
+
+		if (!has_data) {
+			file_struct->top = tn->internal[0];
+			file_struct->top_level--;
+			yaffs_free_tnode(dev, tn);
+		} else {
+			done = 1;
+		}
+	}
+
+	return YAFFS_OK;
+}
+
+/*-------------------- End of File Structure functions.-------------------*/
+
+/* alloc_empty_obj gets us a clean Object.*/
+static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
+
+	if (!obj)
+		return obj;
+
+	dev->n_obj++;
+
+	/* Now sweeten it up... */
+
+	memset(obj, 0, sizeof(struct yaffs_obj));
+	obj->being_created = 1;
+
+	obj->my_dev = dev;
+	obj->hdr_chunk = 0;
+	obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
+	INIT_LIST_HEAD(&(obj->hard_links));
+	INIT_LIST_HEAD(&(obj->hash_link));
+	INIT_LIST_HEAD(&obj->siblings);
+
+	/* Now make the directory sane */
+	if (dev->root_dir) {
+		obj->parent = dev->root_dir;
+		list_add(&(obj->siblings),
+			 &dev->root_dir->variant.dir_variant.children);
+	}
+
+	/* Add it to the lost and found directory.
+	 * NB Can't put root or lost-n-found in lost-n-found so
+	 * check if lost-n-found exists first
+	 */
+	if (dev->lost_n_found)
+		yaffs_add_obj_to_dir(dev->lost_n_found, obj);
+
+	obj->being_created = 0;
+
+	dev->checkpoint_blocks_required = 0;	/* force recalculation */
+
+	return obj;
+}
+
+static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
+{
+	int i;
+	int l = 999;
+	int lowest = 999999;
+
+	/* Search for the shortest list or one that
+	 * isn't too long.
+	 */
+
+	for (i = 0; i < 10 && lowest > 4; i++) {
+		dev->bucket_finder++;
+		dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
+		if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
+			lowest = dev->obj_bucket[dev->bucket_finder].count;
+			l = dev->bucket_finder;
+		}
+	}
+
+	return l;
+}
+
+static int yaffs_new_obj_id(struct yaffs_dev *dev)
+{
+	int bucket = yaffs_find_nice_bucket(dev);
+	int found = 0;
+	struct list_head *i;
+	u32 n = (u32) bucket;
+
+	/*
+	 * Now find an object value that has not already been taken
+	 * by scanning the list, incrementing each time by number of buckets.
+	 */
+	while (!found) {
+		found = 1;
+		n += YAFFS_NOBJECT_BUCKETS;
+		list_for_each(i, &dev->obj_bucket[bucket].list) {
+			/* Check if this value is already taken. */
+			if (i && list_entry(i, struct yaffs_obj,
+					    hash_link)->obj_id == n)
+				found = 0;
+		}
+	}
+	return n;
+}
+
+static void yaffs_hash_obj(struct yaffs_obj *in)
+{
+	int bucket = yaffs_hash_fn(in->obj_id);
+	struct yaffs_dev *dev = in->my_dev;
+
+	list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
+	dev->obj_bucket[bucket].count++;
+}
+
+struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
+{
+	int bucket = yaffs_hash_fn(number);
+	struct list_head *i;
+	struct yaffs_obj *in;
+
+	list_for_each(i, &dev->obj_bucket[bucket].list) {
+		/* Look if it is in the list */
+		in = list_entry(i, struct yaffs_obj, hash_link);
+		if (in->obj_id == number) {
+			/* Don't show if it is defered free */
+			if (in->defered_free)
+				return NULL;
+			return in;
+		}
+	}
+
+	return NULL;
+}
+
+static struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
+				enum yaffs_obj_type type)
+{
+	struct yaffs_obj *the_obj = NULL;
+	struct yaffs_tnode *tn = NULL;
+
+	if (number < 0)
+		number = yaffs_new_obj_id(dev);
+
+	if (type == YAFFS_OBJECT_TYPE_FILE) {
+		tn = yaffs_get_tnode(dev);
+		if (!tn)
+			return NULL;
+	}
+
+	the_obj = yaffs_alloc_empty_obj(dev);
+	if (!the_obj) {
+		if (tn)
+			yaffs_free_tnode(dev, tn);
+		return NULL;
+	}
+
+	the_obj->fake = 0;
+	the_obj->rename_allowed = 1;
+	the_obj->unlink_allowed = 1;
+	the_obj->obj_id = number;
+	yaffs_hash_obj(the_obj);
+	the_obj->variant_type = type;
+	yaffs_load_current_time(the_obj, 1, 1);
+
+	switch (type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		the_obj->variant.file_variant.file_size = 0;
+		the_obj->variant.file_variant.stored_size = 0;
+		the_obj->variant.file_variant.shrink_size =
+						yaffs_max_file_size(dev);
+		the_obj->variant.file_variant.top_level = 0;
+		the_obj->variant.file_variant.top = tn;
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
+		INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		/* No action required */
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		/* todo this should not happen */
+		break;
+	}
+	return the_obj;
+}
+
+static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
+					       int number, u32 mode)
+{
+
+	struct yaffs_obj *obj =
+	    yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
+
+	if (!obj)
+		return NULL;
+
+	obj->fake = 1;	/* it is fake so it might not use NAND */
+	obj->rename_allowed = 0;
+	obj->unlink_allowed = 0;
+	obj->deleted = 0;
+	obj->unlinked = 0;
+	obj->yst_mode = mode;
+	obj->my_dev = dev;
+	obj->hdr_chunk = 0;	/* Not a valid chunk. */
+	return obj;
+
+}
+
+
+static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
+{
+	int i;
+
+	dev->n_obj = 0;
+	dev->n_tnodes = 0;
+	yaffs_init_raw_tnodes_and_objs(dev);
+
+	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+		INIT_LIST_HEAD(&dev->obj_bucket[i].list);
+		dev->obj_bucket[i].count = 0;
+	}
+}
+
+struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
+						 int number,
+						 enum yaffs_obj_type type)
+{
+	struct yaffs_obj *the_obj = NULL;
+
+	if (number > 0)
+		the_obj = yaffs_find_by_number(dev, number);
+
+	if (!the_obj)
+		the_obj = yaffs_new_obj(dev, number, type);
+
+	return the_obj;
+
+}
+
+YCHAR *yaffs_clone_str(const YCHAR *str)
+{
+	YCHAR *new_str = NULL;
+	int len;
+
+	if (!str)
+		str = _Y("");
+
+	len = strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
+	new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
+	if (new_str) {
+		strncpy(new_str, str, len);
+		new_str[len] = 0;
+	}
+	return new_str;
+
+}
+/*
+ *yaffs_update_parent() handles fixing a directories mtime and ctime when a new
+ * link (ie. name) is created or deleted in the directory.
+ *
+ * ie.
+ *   create dir/a : update dir's mtime/ctime
+ *   rm dir/a:   update dir's mtime/ctime
+ *   modify dir/a: don't update dir's mtimme/ctime
+ *
+ * This can be handled immediately or defered. Defering helps reduce the number
+ * of updates when many files in a directory are changed within a brief period.
+ *
+ * If the directory updating is defered then yaffs_update_dirty_dirs must be
+ * called periodically.
+ */
+
+static void yaffs_update_parent(struct yaffs_obj *obj)
+{
+	struct yaffs_dev *dev;
+
+	if (!obj)
+		return;
+	dev = obj->my_dev;
+	obj->dirty = 1;
+	yaffs_load_current_time(obj, 0, 1);
+	if (dev->param.defered_dir_update) {
+		struct list_head *link = &obj->variant.dir_variant.dirty;
+
+		if (list_empty(link)) {
+			list_add(link, &dev->dirty_dirs);
+			yaffs_trace(YAFFS_TRACE_BACKGROUND,
+			  "Added object %d to dirty directories",
+			   obj->obj_id);
+		}
+
+	} else {
+		yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
+	}
+}
+
+void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
+{
+	struct list_head *link;
+	struct yaffs_obj *obj;
+	struct yaffs_dir_var *d_s;
+	union yaffs_obj_var *o_v;
+
+	yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories");
+
+	while (!list_empty(&dev->dirty_dirs)) {
+		link = dev->dirty_dirs.next;
+		list_del_init(link);
+
+		d_s = list_entry(link, struct yaffs_dir_var, dirty);
+		o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
+		obj = list_entry(o_v, struct yaffs_obj, variant);
+
+		yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d",
+			obj->obj_id);
+
+		if (obj->dirty)
+			yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
+	}
+}
+
+/*
+ * Mknod (create) a new object.
+ * equiv_obj only has meaning for a hard link;
+ * alias_str only has meaning for a symlink.
+ * rdev only has meaning for devices (a subset of special objects)
+ */
+
+static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
+					  struct yaffs_obj *parent,
+					  const YCHAR *name,
+					  u32 mode,
+					  u32 uid,
+					  u32 gid,
+					  struct yaffs_obj *equiv_obj,
+					  const YCHAR *alias_str, u32 rdev)
+{
+	struct yaffs_obj *in;
+	YCHAR *str = NULL;
+	struct yaffs_dev *dev = parent->my_dev;
+
+	/* Check if the entry exists.
+	 * If it does then fail the call since we don't want a dup. */
+	if (yaffs_find_by_name(parent, name))
+		return NULL;
+
+	if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
+		str = yaffs_clone_str(alias_str);
+		if (!str)
+			return NULL;
+	}
+
+	in = yaffs_new_obj(dev, -1, type);
+
+	if (!in) {
+		kfree(str);
+		return NULL;
+	}
+
+	in->hdr_chunk = 0;
+	in->valid = 1;
+	in->variant_type = type;
+
+	in->yst_mode = mode;
+
+	yaffs_attribs_init(in, gid, uid, rdev);
+
+	in->n_data_chunks = 0;
+
+	yaffs_set_obj_name(in, name);
+	in->dirty = 1;
+
+	yaffs_add_obj_to_dir(parent, in);
+
+	in->my_dev = parent->my_dev;
+
+	switch (type) {
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		in->variant.symlink_variant.alias = str;
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		in->variant.hardlink_variant.equiv_obj = equiv_obj;
+		in->variant.hardlink_variant.equiv_id = equiv_obj->obj_id;
+		list_add(&in->hard_links, &equiv_obj->hard_links);
+		break;
+	case YAFFS_OBJECT_TYPE_FILE:
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		/* do nothing */
+		break;
+	}
+
+	if (yaffs_update_oh(in, name, 0, 0, 0, NULL) < 0) {
+		/* Could not create the object header, fail */
+		yaffs_del_obj(in);
+		in = NULL;
+	}
+
+	if (in)
+		yaffs_update_parent(parent);
+
+	return in;
+}
+
+struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
+				    const YCHAR *name, u32 mode, u32 uid,
+				    u32 gid)
+{
+	return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
+				uid, gid, NULL, NULL, 0);
+}
+
+struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
+				   u32 mode, u32 uid, u32 gid)
+{
+	return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
+				mode, uid, gid, NULL, NULL, 0);
+}
+
+struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
+				       const YCHAR *name, u32 mode, u32 uid,
+				       u32 gid, u32 rdev)
+{
+	return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
+				uid, gid, NULL, NULL, rdev);
+}
+
+struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
+				       const YCHAR *name, u32 mode, u32 uid,
+				       u32 gid, const YCHAR *alias)
+{
+	return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
+				uid, gid, NULL, alias, 0);
+}
+
+/* yaffs_link_obj returns the object id of the equivalent object.*/
+struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
+				 struct yaffs_obj *equiv_obj)
+{
+	/* Get the real object in case we were fed a hard link obj */
+	equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
+
+	if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK,
+			parent, name, 0, 0, 0,
+			equiv_obj, NULL, 0))
+		return equiv_obj;
+
+	return NULL;
+
+}
+
+
+
+/*---------------------- Block Management and Page Allocation -------------*/
+
+static void yaffs_deinit_blocks(struct yaffs_dev *dev)
+{
+	if (dev->block_info_alt && dev->block_info)
+		vfree(dev->block_info);
+	else
+		kfree(dev->block_info);
+
+	dev->block_info_alt = 0;
+
+	dev->block_info = NULL;
+
+	if (dev->chunk_bits_alt && dev->chunk_bits)
+		vfree(dev->chunk_bits);
+	else
+		kfree(dev->chunk_bits);
+	dev->chunk_bits_alt = 0;
+	dev->chunk_bits = NULL;
+}
+
+static int yaffs_init_blocks(struct yaffs_dev *dev)
+{
+	int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
+
+	dev->block_info = NULL;
+	dev->chunk_bits = NULL;
+	dev->alloc_block = -1;	/* force it to get a new one */
+
+	/* If the first allocation strategy fails, thry the alternate one */
+	dev->block_info =
+		kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS);
+	if (!dev->block_info) {
+		dev->block_info =
+		    vmalloc(n_blocks * sizeof(struct yaffs_block_info));
+		dev->block_info_alt = 1;
+	} else {
+		dev->block_info_alt = 0;
+	}
+
+	if (!dev->block_info)
+		goto alloc_error;
+
+	/* Set up dynamic blockinfo stuff. Round up bytes. */
+	dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8;
+	dev->chunk_bits =
+		kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS);
+	if (!dev->chunk_bits) {
+		dev->chunk_bits =
+		    vmalloc(dev->chunk_bit_stride * n_blocks);
+		dev->chunk_bits_alt = 1;
+	} else {
+		dev->chunk_bits_alt = 0;
+	}
+	if (!dev->chunk_bits)
+		goto alloc_error;
+
+
+	memset(dev->block_info, 0, n_blocks * sizeof(struct yaffs_block_info));
+	memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
+	return YAFFS_OK;
+
+alloc_error:
+	yaffs_deinit_blocks(dev);
+	return YAFFS_FAIL;
+}
+
+
+void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
+{
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
+	int erased_ok = 0;
+	u32 i;
+
+	/* If the block is still healthy erase it and mark as clean.
+	 * If the block has had a data failure, then retire it.
+	 */
+
+	yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
+		"yaffs_block_became_dirty block %d state %d %s",
+		block_no, bi->block_state,
+		(bi->needs_retiring) ? "needs retiring" : "");
+
+	yaffs2_clear_oldest_dirty_seq(dev, bi);
+
+	bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
+
+	/* If this is the block being garbage collected then stop gc'ing */
+	if (block_no == (int)dev->gc_block)
+		dev->gc_block = 0;
+
+	/* If this block is currently the best candidate for gc
+	 * then drop as a candidate */
+	if (block_no == (int)dev->gc_dirtiest) {
+		dev->gc_dirtiest = 0;
+		dev->gc_pages_in_use = 0;
+	}
+
+	if (!bi->needs_retiring) {
+		yaffs2_checkpt_invalidate(dev);
+		erased_ok = yaffs_erase_block(dev, block_no);
+		if (!erased_ok) {
+			dev->n_erase_failures++;
+			yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+			  "**>> Erasure failed %d", block_no);
+		}
+	}
+
+	/* Verify erasure if needed */
+	if (erased_ok &&
+	    ((yaffs_trace_mask & YAFFS_TRACE_ERASE) ||
+	     !yaffs_skip_verification(dev))) {
+		for (i = 0; i < dev->param.chunks_per_block; i++) {
+			if (!yaffs_check_chunk_erased(dev,
+				block_no * dev->param.chunks_per_block + i)) {
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					">>Block %d erasure supposedly OK, but chunk %d not erased",
+					block_no, i);
+			}
+		}
+	}
+
+	if (!erased_ok) {
+		/* We lost a block of free space */
+		dev->n_free_chunks -= dev->param.chunks_per_block;
+		yaffs_retire_block(dev, block_no);
+		yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+			"**>> Block %d retired", block_no);
+		return;
+	}
+
+	/* Clean it up... */
+	bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
+	bi->seq_number = 0;
+	dev->n_erased_blocks++;
+	bi->pages_in_use = 0;
+	bi->soft_del_pages = 0;
+	bi->has_shrink_hdr = 0;
+	bi->skip_erased_check = 1;	/* Clean, so no need to check */
+	bi->gc_prioritise = 0;
+	bi->has_summary = 0;
+
+	yaffs_clear_chunk_bits(dev, block_no);
+
+	yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no);
+}
+
+static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev,
+					struct yaffs_block_info *bi,
+					int old_chunk, u8 *buffer)
+{
+	int new_chunk;
+	int mark_flash = 1;
+	struct yaffs_ext_tags tags;
+	struct yaffs_obj *object;
+	int matching_chunk;
+	int ret_val = YAFFS_OK;
+
+	memset(&tags, 0, sizeof(tags));
+	yaffs_rd_chunk_tags_nand(dev, old_chunk,
+				 buffer, &tags);
+	object = yaffs_find_by_number(dev, tags.obj_id);
+
+	yaffs_trace(YAFFS_TRACE_GC_DETAIL,
+		"Collecting chunk in block %d, %d %d %d ",
+		dev->gc_chunk, tags.obj_id,
+		tags.chunk_id, tags.n_bytes);
+
+	if (object && !yaffs_skip_verification(dev)) {
+		if (tags.chunk_id == 0)
+			matching_chunk =
+			    object->hdr_chunk;
+		else if (object->soft_del)
+			/* Defeat the test */
+			matching_chunk = old_chunk;
+		else
+			matching_chunk =
+			    yaffs_find_chunk_in_file
+			    (object, tags.chunk_id,
+			     NULL);
+
+		if (old_chunk != matching_chunk)
+			yaffs_trace(YAFFS_TRACE_ERROR,
+				"gc: page in gc mismatch: %d %d %d %d",
+				old_chunk,
+				matching_chunk,
+				tags.obj_id,
+				tags.chunk_id);
+	}
+
+	if (!object) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"page %d in gc has no object: %d %d %d ",
+			old_chunk,
+			tags.obj_id, tags.chunk_id,
+			tags.n_bytes);
+	}
+
+	if (object &&
+	    object->deleted &&
+	    object->soft_del && tags.chunk_id != 0) {
+		/* Data chunk in a soft deleted file,
+		 * throw it away.
+		 * It's a soft deleted data chunk,
+		 * No need to copy this, just forget
+		 * about it and fix up the object.
+		 */
+
+		/* Free chunks already includes
+		 * softdeleted chunks, how ever this
+		 * chunk is going to soon be really
+		 * deleted which will increment free
+		 * chunks. We have to decrement free
+		 * chunks so this works out properly.
+		 */
+		dev->n_free_chunks--;
+		bi->soft_del_pages--;
+
+		object->n_data_chunks--;
+		if (object->n_data_chunks <= 0) {
+			/* remeber to clean up obj */
+			dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id;
+			dev->n_clean_ups++;
+		}
+		mark_flash = 0;
+	} else if (object) {
+		/* It's either a data chunk in a live
+		 * file or an ObjectHeader, so we're
+		 * interested in it.
+		 * NB Need to keep the ObjectHeaders of
+		 * deleted files until the whole file
+		 * has been deleted off
+		 */
+		tags.serial_number++;
+		dev->n_gc_copies++;
+
+		if (tags.chunk_id == 0) {
+			/* It is an object Id,
+			 * We need to nuke the shrinkheader flags since its
+			 * work is done.
+			 * Also need to clean up shadowing.
+			 * NB We don't want to do all the work of translating
+			 * object header endianism back and forth so we leave
+			 * the oh endian in its stored order.
+			 */
+
+			struct yaffs_obj_hdr *oh;
+			oh = (struct yaffs_obj_hdr *) buffer;
+
+			oh->is_shrink = 0;
+			tags.extra_is_shrink = 0;
+			oh->shadows_obj = 0;
+			oh->inband_shadowed_obj_id = 0;
+			tags.extra_shadows = 0;
+
+			/* Update file size */
+			if (object->variant_type == YAFFS_OBJECT_TYPE_FILE) {
+				yaffs_oh_size_load(dev, oh,
+				    object->variant.file_variant.stored_size, 1);
+				tags.extra_file_size =
+				    object->variant.file_variant.stored_size;
+			}
+
+			yaffs_verify_oh(object, oh, &tags, 1);
+			new_chunk =
+			    yaffs_write_new_chunk(dev, (u8 *) oh, &tags, 1);
+		} else {
+			new_chunk =
+			    yaffs_write_new_chunk(dev, buffer, &tags, 1);
+		}
+
+		if (new_chunk < 0) {
+			ret_val = YAFFS_FAIL;
+		} else {
+
+			/* Now fix up the Tnodes etc. */
+
+			if (tags.chunk_id == 0) {
+				/* It's a header */
+				object->hdr_chunk = new_chunk;
+				object->serial = tags.serial_number;
+			} else {
+				/* It's a data chunk */
+				yaffs_put_chunk_in_file(object, tags.chunk_id,
+							new_chunk, 0);
+			}
+		}
+	}
+	if (ret_val == YAFFS_OK)
+		yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__);
+	return ret_val;
+}
+
+static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
+{
+	int old_chunk;
+	int ret_val = YAFFS_OK;
+	u32 i;
+	int is_checkpt_block;
+	int max_copies;
+	int chunks_before = yaffs_get_erased_chunks(dev);
+	int chunks_after;
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
+
+	is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
+
+	yaffs_trace(YAFFS_TRACE_TRACING,
+		"Collecting block %d, in use %d, shrink %d, whole_block %d",
+		block, bi->pages_in_use, bi->has_shrink_hdr,
+		whole_block);
+
+	/*yaffs_verify_free_chunks(dev); */
+
+	if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
+		bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
+
+	bi->has_shrink_hdr = 0;	/* clear the flag so that the block can erase */
+
+	dev->gc_disable = 1;
+
+	yaffs_summary_gc(dev, block);
+
+	if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
+		yaffs_trace(YAFFS_TRACE_TRACING,
+			"Collecting block %d that has no chunks in use",
+			block);
+		yaffs_block_became_dirty(dev, block);
+	} else {
+
+		u8 *buffer = yaffs_get_temp_buffer(dev);
+
+		yaffs_verify_blk(dev, bi, block);
+
+		max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
+		old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
+
+		for (/* init already done */ ;
+		     ret_val == YAFFS_OK &&
+		     dev->gc_chunk < dev->param.chunks_per_block &&
+		     (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
+		     max_copies > 0;
+		     dev->gc_chunk++, old_chunk++) {
+			if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
+				/* Page is in use and might need to be copied */
+				max_copies--;
+				ret_val = yaffs_gc_process_chunk(dev, bi,
+							old_chunk, buffer);
+			}
+		}
+		yaffs_release_temp_buffer(dev, buffer);
+	}
+
+	yaffs_verify_collected_blk(dev, bi, block);
+
+	if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
+		/*
+		 * The gc did not complete. Set block state back to FULL
+		 * because checkpointing does not restore gc.
+		 */
+		bi->block_state = YAFFS_BLOCK_STATE_FULL;
+	} else {
+		/* The gc completed. */
+		/* Do any required cleanups */
+		for (i = 0; i < dev->n_clean_ups; i++) {
+			/* Time to delete the file too */
+			struct yaffs_obj *object =
+			    yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
+			if (object) {
+				yaffs_free_tnode(dev,
+					  object->variant.file_variant.top);
+				object->variant.file_variant.top = NULL;
+				yaffs_trace(YAFFS_TRACE_GC,
+					"yaffs: About to finally delete object %d",
+					object->obj_id);
+				yaffs_generic_obj_del(object);
+				object->my_dev->n_deleted_files--;
+			}
+
+		}
+		chunks_after = yaffs_get_erased_chunks(dev);
+		if (chunks_before >= chunks_after)
+			yaffs_trace(YAFFS_TRACE_GC,
+				"gc did not increase free chunks before %d after %d",
+				chunks_before, chunks_after);
+		dev->gc_block = 0;
+		dev->gc_chunk = 0;
+		dev->n_clean_ups = 0;
+	}
+
+	dev->gc_disable = 0;
+
+	return ret_val;
+}
+
+/*
+ * find_gc_block() selects the dirtiest block (or close enough)
+ * for garbage collection.
+ */
+
+static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
+				    int aggressive, int background)
+{
+	u32 i;
+	u32 iterations;
+	u32 selected = 0;
+	int prioritised = 0;
+	int prioritised_exist = 0;
+	struct yaffs_block_info *bi;
+	u32 threshold;
+
+	/* First let's see if we need to grab a prioritised block */
+	if (dev->has_pending_prioritised_gc && !aggressive) {
+		dev->gc_dirtiest = 0;
+		bi = dev->block_info;
+		for (i = dev->internal_start_block;
+		     i <= dev->internal_end_block && !selected; i++) {
+
+			if (bi->gc_prioritise) {
+				prioritised_exist = 1;
+				if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
+				    yaffs_block_ok_for_gc(dev, bi)) {
+					selected = i;
+					prioritised = 1;
+				}
+			}
+			bi++;
+		}
+
+		/*
+		 * If there is a prioritised block and none was selected then
+		 * this happened because there is at least one old dirty block
+		 * gumming up the works. Let's gc the oldest dirty block.
+		 */
+
+		if (prioritised_exist &&
+		    !selected && dev->oldest_dirty_block > 0)
+			selected = dev->oldest_dirty_block;
+
+		if (!prioritised_exist)	/* None found, so we can clear this */
+			dev->has_pending_prioritised_gc = 0;
+	}
+
+	/* If we're doing aggressive GC then we are happy to take a less-dirty
+	 * block, and search harder.
+	 * else (leasurely gc), then we only bother to do this if the
+	 * block has only a few pages in use.
+	 */
+
+	if (!selected) {
+		u32 pages_used;
+		int n_blocks =
+		    dev->internal_end_block - dev->internal_start_block + 1;
+		if (aggressive) {
+			threshold = dev->param.chunks_per_block;
+			iterations = n_blocks;
+		} else {
+			u32 max_threshold;
+
+			if (background)
+				max_threshold = dev->param.chunks_per_block / 2;
+			else
+				max_threshold = dev->param.chunks_per_block / 8;
+
+			if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
+				max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
+
+			threshold = background ? (dev->gc_not_done + 2) * 2 : 0;
+			if (threshold < YAFFS_GC_PASSIVE_THRESHOLD)
+				threshold = YAFFS_GC_PASSIVE_THRESHOLD;
+			if (threshold > max_threshold)
+				threshold = max_threshold;
+
+			iterations = n_blocks / 16 + 1;
+			if (iterations > 100)
+				iterations = 100;
+		}
+
+		for (i = 0;
+		     i < iterations &&
+		     (dev->gc_dirtiest < 1 ||
+		      dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH);
+		     i++) {
+			dev->gc_block_finder++;
+			if (dev->gc_block_finder < dev->internal_start_block ||
+			    dev->gc_block_finder > dev->internal_end_block)
+				dev->gc_block_finder =
+				    dev->internal_start_block;
+
+			bi = yaffs_get_block_info(dev, dev->gc_block_finder);
+
+			pages_used = bi->pages_in_use - bi->soft_del_pages;
+
+			if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
+			    pages_used < dev->param.chunks_per_block &&
+			    (dev->gc_dirtiest < 1 ||
+			     pages_used < dev->gc_pages_in_use) &&
+			    yaffs_block_ok_for_gc(dev, bi)) {
+				dev->gc_dirtiest = dev->gc_block_finder;
+				dev->gc_pages_in_use = pages_used;
+			}
+		}
+
+		if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
+			selected = dev->gc_dirtiest;
+	}
+
+	/*
+	 * If nothing has been selected for a while, try the oldest dirty
+	 * because that's gumming up the works.
+	 */
+
+	if (!selected && dev->param.is_yaffs2 &&
+	    dev->gc_not_done >= (background ? 10 : 20)) {
+		yaffs2_find_oldest_dirty_seq(dev);
+		if (dev->oldest_dirty_block > 0) {
+			selected = dev->oldest_dirty_block;
+			dev->gc_dirtiest = selected;
+			dev->oldest_dirty_gc_count++;
+			bi = yaffs_get_block_info(dev, selected);
+			dev->gc_pages_in_use =
+			    bi->pages_in_use - bi->soft_del_pages;
+		} else {
+			dev->gc_not_done = 0;
+		}
+	}
+
+	if (selected) {
+		yaffs_trace(YAFFS_TRACE_GC,
+			"GC Selected block %d with %d free, prioritised:%d",
+			selected,
+			dev->param.chunks_per_block - dev->gc_pages_in_use,
+			prioritised);
+
+		dev->n_gc_blocks++;
+		if (background)
+			dev->bg_gcs++;
+
+		dev->gc_dirtiest = 0;
+		dev->gc_pages_in_use = 0;
+		dev->gc_not_done = 0;
+		if (dev->refresh_skip > 0)
+			dev->refresh_skip--;
+	} else {
+		dev->gc_not_done++;
+		yaffs_trace(YAFFS_TRACE_GC,
+			"GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
+			dev->gc_block_finder, dev->gc_not_done, threshold,
+			dev->gc_dirtiest, dev->gc_pages_in_use,
+			dev->oldest_dirty_block, background ? " bg" : "");
+	}
+
+	return selected;
+}
+
+/* New garbage collector
+ * If we're very low on erased blocks then we do aggressive garbage collection
+ * otherwise we do "leasurely" garbage collection.
+ * Aggressive gc looks further (whole array) and will accept less dirty blocks.
+ * Passive gc only inspects smaller areas and only accepts more dirty blocks.
+ *
+ * The idea is to help clear out space in a more spread-out manner.
+ * Dunno if it really does anything useful.
+ */
+static int yaffs_check_gc(struct yaffs_dev *dev, int background)
+{
+	int aggressive = 0;
+	int gc_ok = YAFFS_OK;
+	int max_tries = 0;
+	int min_erased;
+	int erased_chunks;
+	int checkpt_block_adjust;
+
+	if (dev->param.gc_control_fn &&
+		(dev->param.gc_control_fn(dev) & 1) == 0)
+		return YAFFS_OK;
+
+	if (dev->gc_disable)
+		/* Bail out so we don't get recursive gc */
+		return YAFFS_OK;
+
+	/* This loop should pass the first time.
+	 * Only loops here if the collection does not increase space.
+	 */
+
+	do {
+		max_tries++;
+
+		checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
+
+		min_erased =
+		    dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
+		erased_chunks =
+		    dev->n_erased_blocks * dev->param.chunks_per_block;
+
+		/* If we need a block soon then do aggressive gc. */
+		if (dev->n_erased_blocks < min_erased)
+			aggressive = 1;
+		else {
+			if (!background
+			    && erased_chunks > (dev->n_free_chunks / 4))
+				break;
+
+			if (dev->gc_skip > 20)
+				dev->gc_skip = 20;
+			if (erased_chunks < dev->n_free_chunks / 2 ||
+			    dev->gc_skip < 1 || background)
+				aggressive = 0;
+			else {
+				dev->gc_skip--;
+				break;
+			}
+		}
+
+		dev->gc_skip = 5;
+
+		/* If we don't already have a block being gc'd then see if we
+		 * should start another */
+
+		if (dev->gc_block < 1 && !aggressive) {
+			dev->gc_block = yaffs2_find_refresh_block(dev);
+			dev->gc_chunk = 0;
+			dev->n_clean_ups = 0;
+		}
+		if (dev->gc_block < 1) {
+			dev->gc_block =
+			    yaffs_find_gc_block(dev, aggressive, background);
+			dev->gc_chunk = 0;
+			dev->n_clean_ups = 0;
+		}
+
+		if (dev->gc_block > 0) {
+			dev->all_gcs++;
+			if (!aggressive)
+				dev->passive_gc_count++;
+
+			yaffs_trace(YAFFS_TRACE_GC,
+				"yaffs: GC n_erased_blocks %d aggressive %d",
+				dev->n_erased_blocks, aggressive);
+
+			gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
+		}
+
+		if (dev->n_erased_blocks < (int)dev->param.n_reserved_blocks &&
+		    dev->gc_block > 0) {
+			yaffs_trace(YAFFS_TRACE_GC,
+				"yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
+				dev->n_erased_blocks, max_tries,
+				dev->gc_block);
+		}
+	} while ((dev->n_erased_blocks < (int)dev->param.n_reserved_blocks) &&
+		 (dev->gc_block > 0) && (max_tries < 2));
+
+	return aggressive ? gc_ok : YAFFS_OK;
+}
+
+/*
+ * yaffs_bg_gc()
+ * Garbage collects. Intended to be called from a background thread.
+ * Returns non-zero if at least half the free chunks are erased.
+ */
+int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
+{
+	int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
+
+	yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency);
+
+	yaffs_check_gc(dev, 1);
+	return erased_chunks > dev->n_free_chunks / 2;
+}
+
+/*-------------------- Data file manipulation -----------------*/
+
+static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
+{
+	int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
+
+	if (nand_chunk >= 0)
+		return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
+						buffer, NULL);
+	else {
+		yaffs_trace(YAFFS_TRACE_NANDACCESS,
+			"Chunk %d not found zero instead",
+			nand_chunk);
+		/* get sane (zero) data if you read a hole */
+		memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
+		return 0;
+	}
+
+}
+
+void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
+		     int lyn)
+{
+	int block;
+	int page;
+	struct yaffs_ext_tags tags;
+	struct yaffs_block_info *bi;
+
+	if (chunk_id <= 0)
+		return;
+
+	dev->n_deletions++;
+	block = chunk_id / dev->param.chunks_per_block;
+	page = chunk_id % dev->param.chunks_per_block;
+
+	if (!yaffs_check_chunk_bit(dev, block, page))
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Deleting invalid chunk %d", chunk_id);
+
+	bi = yaffs_get_block_info(dev, block);
+
+	yaffs2_update_oldest_dirty_seq(dev, block, bi);
+
+	yaffs_trace(YAFFS_TRACE_DELETION,
+		"line %d delete of chunk %d",
+		lyn, chunk_id);
+
+	if (!dev->param.is_yaffs2 && mark_flash &&
+	    bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
+
+		memset(&tags, 0, sizeof(tags));
+		tags.is_deleted = 1;
+		yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
+		yaffs_handle_chunk_update(dev, chunk_id, &tags);
+	} else {
+		dev->n_unmarked_deletions++;
+	}
+
+	/* Pull out of the management area.
+	 * If the whole block became dirty, this will kick off an erasure.
+	 */
+	if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
+	    bi->block_state == YAFFS_BLOCK_STATE_FULL ||
+	    bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
+	    bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
+		dev->n_free_chunks++;
+		yaffs_clear_chunk_bit(dev, block, page);
+		bi->pages_in_use--;
+
+		if (bi->pages_in_use == 0 &&
+		    !bi->has_shrink_hdr &&
+		    bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
+		    bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCAN) {
+			yaffs_block_became_dirty(dev, block);
+		}
+	}
+}
+
+static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
+			     const u8 *buffer, int n_bytes, int use_reserve)
+{
+	/* Find old chunk Need to do this to get serial number
+	 * Write new one and patch into tree.
+	 * Invalidate old tags.
+	 */
+
+	int prev_chunk_id;
+	struct yaffs_ext_tags prev_tags;
+	int new_chunk_id;
+	struct yaffs_ext_tags new_tags;
+	struct yaffs_dev *dev = in->my_dev;
+	loff_t endpos;
+
+	yaffs_check_gc(dev, 0);
+
+	/* Get the previous chunk at this location in the file if it exists.
+	 * If it does not exist then put a zero into the tree. This creates
+	 * the tnode now, rather than later when it is harder to clean up.
+	 */
+	prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags);
+	if (prev_chunk_id < 1 &&
+	    !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
+		return 0;
+
+	/* Set up new tags */
+	memset(&new_tags, 0, sizeof(new_tags));
+
+	new_tags.chunk_id = inode_chunk;
+	new_tags.obj_id = in->obj_id;
+	new_tags.serial_number =
+	    (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1;
+	new_tags.n_bytes = n_bytes;
+
+	if (n_bytes < 1 || n_bytes > (int)dev->data_bytes_per_chunk) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+		  "Writing %d bytes to chunk!!!!!!!!!",
+		   n_bytes);
+		BUG();
+	}
+
+	/*
+	 * If this is a data chunk and the write goes past the end of the stored
+	 * size then update the stored_size.
+	 */
+	if (inode_chunk > 0) {
+		endpos =  (inode_chunk - 1) * dev->data_bytes_per_chunk +
+				n_bytes;
+		if (in->variant.file_variant.stored_size < endpos)
+			in->variant.file_variant.stored_size = endpos;
+	}
+
+	new_chunk_id =
+	    yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
+
+	if (new_chunk_id > 0) {
+		yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
+
+		if (prev_chunk_id > 0)
+			yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
+
+		yaffs_verify_file_sane(in);
+	}
+	return new_chunk_id;
+}
+
+
+
+static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
+				const YCHAR *name, const void *value, int size,
+				int flags)
+{
+	struct yaffs_xattr_mod xmod;
+	int result;
+
+	xmod.set = set;
+	xmod.name = name;
+	xmod.data = value;
+	xmod.size = size;
+	xmod.flags = flags;
+	xmod.result = -ENOSPC;
+
+	result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
+
+	if (result > 0)
+		return xmod.result;
+	else
+		return -ENOSPC;
+}
+
+static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
+				   struct yaffs_xattr_mod *xmod)
+{
+	int retval = 0;
+	int x_offs = sizeof(struct yaffs_obj_hdr);
+	struct yaffs_dev *dev = obj->my_dev;
+	int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
+	char *x_buffer = buffer + x_offs;
+
+	if (xmod->set)
+		retval =
+		    nval_set(dev, x_buffer, x_size, xmod->name, xmod->data,
+			     xmod->size, xmod->flags);
+	else
+		retval = nval_del(dev, x_buffer, x_size, xmod->name);
+
+	obj->has_xattr = nval_hasvalues(dev, x_buffer, x_size);
+	obj->xattr_known = 1;
+	xmod->result = retval;
+
+	return retval;
+}
+
+static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR *name,
+				  void *value, int size)
+{
+	char *buffer = NULL;
+	int result;
+	struct yaffs_ext_tags tags;
+	struct yaffs_dev *dev = obj->my_dev;
+	int x_offs = sizeof(struct yaffs_obj_hdr);
+	int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
+	char *x_buffer;
+	int retval = 0;
+
+	if (obj->hdr_chunk < 1)
+		return -ENODATA;
+
+	/* If we know that the object has no xattribs then don't do all the
+	 * reading and parsing.
+	 */
+	if (obj->xattr_known && !obj->has_xattr) {
+		if (name)
+			return -ENODATA;
+		else
+			return 0;
+	}
+
+	buffer = (char *)yaffs_get_temp_buffer(dev);
+	if (!buffer)
+		return -ENOMEM;
+
+	result =
+	    yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
+
+	if (result != YAFFS_OK)
+		retval = -ENOENT;
+	else {
+		x_buffer = buffer + x_offs;
+
+		if (!obj->xattr_known) {
+			obj->has_xattr = nval_hasvalues(dev, x_buffer, x_size);
+			obj->xattr_known = 1;
+		}
+
+		if (name)
+			retval = nval_get(dev, x_buffer, x_size,
+						name, value, size);
+		else
+			retval = nval_list(dev, x_buffer, x_size, value, size);
+	}
+	yaffs_release_temp_buffer(dev, (u8 *) buffer);
+	return retval;
+}
+
+int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
+		      const void *value, int size, int flags)
+{
+	return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
+}
+
+int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
+{
+	return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
+}
+
+int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
+		      int size)
+{
+	return yaffs_do_xattrib_fetch(obj, name, value, size);
+}
+
+int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
+{
+	return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
+}
+
+static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
+{
+	u8 *buf;
+	struct yaffs_obj_hdr *oh;
+	struct yaffs_dev *dev;
+	struct yaffs_ext_tags tags;
+	int result;
+
+	if (!in || !in->lazy_loaded || in->hdr_chunk < 1)
+		return;
+
+	dev = in->my_dev;
+	buf = yaffs_get_temp_buffer(dev);
+
+	result = yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags);
+
+	if (result == YAFFS_FAIL)
+		return;
+
+	oh = (struct yaffs_obj_hdr *)buf;
+
+	yaffs_do_endian_oh(dev, oh);
+
+	in->lazy_loaded = 0;
+	in->yst_mode = oh->yst_mode;
+	yaffs_load_attribs(in, oh);
+	yaffs_set_obj_name_from_oh(in, oh);
+
+	if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
+		in->variant.symlink_variant.alias =
+		    yaffs_clone_str(oh->alias);
+	yaffs_release_temp_buffer(dev, buf);
+}
+
+/* UpdateObjectHeader updates the header on NAND for an object.
+ * If name is not NULL, then that new name is used.
+ *
+ * We're always creating the obj header from scratch (except reading
+ * the old name) so first set up in cpu endianness then run it through
+ * endian fixing at the end.
+ *
+ * However, a twist: If there are xattribs we leave them as they were.
+ *
+ * Careful! The buffer holds the whole chunk. Part of the chunk holds the
+ * object header and the rest holds the xattribs, therefore we use a buffer
+ * pointer and an oh pointer to point to the same memory.
+ */
+
+int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, int force,
+		    int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
+{
+
+	struct yaffs_block_info *bi;
+	struct yaffs_dev *dev = in->my_dev;
+	int prev_chunk_id;
+	int ret_val = 0;
+	int result = 0;
+	int new_chunk_id;
+	struct yaffs_ext_tags new_tags;
+	struct yaffs_ext_tags old_tags;
+	const YCHAR *alias = NULL;
+	u8 *buffer = NULL;
+	YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
+	struct yaffs_obj_hdr *oh = NULL;
+	loff_t file_size = 0;
+
+	strcpy(old_name, _Y("silly old name"));
+
+	if (in->fake && in != dev->root_dir && !force && !xmod)
+		return ret_val;
+
+	yaffs_check_gc(dev, 0);
+	yaffs_check_obj_details_loaded(in);
+
+	buffer = yaffs_get_temp_buffer(in->my_dev);
+	oh = (struct yaffs_obj_hdr *)buffer;
+
+	prev_chunk_id = in->hdr_chunk;
+
+	if (prev_chunk_id > 0) {
+		/* Access the old obj header just to read the name. */
+		result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
+						  buffer, &old_tags);
+		if (result == YAFFS_OK) {
+			yaffs_verify_oh(in, oh, &old_tags, 0);
+			memcpy(old_name, oh->name, sizeof(oh->name));
+
+			/*
+			* NB We only wipe the object header area because the rest of
+			* the buffer might contain xattribs.
+			*/
+			memset(oh, 0xff, sizeof(*oh));
+		}
+	} else {
+		memset(buffer, 0xff, dev->data_bytes_per_chunk);
+	}
+
+	oh->type = in->variant_type;
+	oh->yst_mode = in->yst_mode;
+	oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
+
+	yaffs_load_attribs_oh(oh, in);
+
+	if (in->parent)
+		oh->parent_obj_id = in->parent->obj_id;
+	else
+		oh->parent_obj_id = 0;
+
+	if (name && *name) {
+		memset(oh->name, 0, sizeof(oh->name));
+		yaffs_load_oh_from_name(dev, oh->name, name);
+	} else if (prev_chunk_id > 0) {
+		memcpy(oh->name, old_name, sizeof(oh->name));
+	} else {
+		memset(oh->name, 0, sizeof(oh->name));
+	}
+
+	oh->is_shrink = is_shrink;
+
+	switch (in->variant_type) {
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		/* Should not happen */
+		break;
+	case YAFFS_OBJECT_TYPE_FILE:
+		if (oh->parent_obj_id != YAFFS_OBJECTID_DELETED &&
+		    oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED)
+			file_size = in->variant.file_variant.stored_size;
+		yaffs_oh_size_load(dev, oh, file_size, 0);
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		oh->equiv_id = in->variant.hardlink_variant.equiv_id;
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		/* Do nothing */
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		/* Do nothing */
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		alias = in->variant.symlink_variant.alias;
+		if (!alias)
+			alias = _Y("no alias");
+		strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
+		oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+		break;
+	}
+
+	/* process any xattrib modifications */
+	if (xmod)
+		yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
+
+	/* Tags */
+	memset(&new_tags, 0, sizeof(new_tags));
+	in->serial++;
+	new_tags.chunk_id = 0;
+	new_tags.obj_id = in->obj_id;
+	new_tags.serial_number = in->serial;
+
+	/* Add extra info for file header */
+	new_tags.extra_available = 1;
+	new_tags.extra_parent_id = oh->parent_obj_id;
+	new_tags.extra_file_size = file_size;
+	new_tags.extra_is_shrink = oh->is_shrink;
+	new_tags.extra_equiv_id = oh->equiv_id;
+	new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
+	new_tags.extra_obj_type = in->variant_type;
+
+	/* Now endian swizzle the oh if needed. */
+	yaffs_do_endian_oh(dev, oh);
+
+	yaffs_verify_oh(in, oh, &new_tags, 1);
+
+	/* Create new chunk in NAND */
+	new_chunk_id =
+	    yaffs_write_new_chunk(dev, buffer, &new_tags,
+				  (prev_chunk_id > 0) ? 1 : 0);
+
+	if (buffer)
+		yaffs_release_temp_buffer(dev, buffer);
+
+	if (new_chunk_id < 0)
+		return new_chunk_id;
+
+	in->hdr_chunk = new_chunk_id;
+
+	if (prev_chunk_id > 0)
+		yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
+
+	if (!yaffs_obj_cache_dirty(in))
+		in->dirty = 0;
+
+	/* If this was a shrink, then mark the block
+	 * that the chunk lives on */
+	if (is_shrink) {
+		bi = yaffs_get_block_info(in->my_dev,
+					  new_chunk_id /
+					  in->my_dev->param.chunks_per_block);
+		bi->has_shrink_hdr = 1;
+	}
+
+
+	return new_chunk_id;
+}
+
+/*--------------------- File read/write ------------------------
+ * Read and write have very similar structures.
+ * In general the read/write has three parts to it
+ * An incomplete chunk to start with (if the read/write is not chunk-aligned)
+ * Some complete chunks
+ * An incomplete chunk to end off with
+ *
+ * Curve-balls: the first chunk might also be the last chunk.
+ */
+
+int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes)
+{
+	int chunk;
+	u32 start;
+	int n_copy;
+	int n = n_bytes;
+	int n_done = 0;
+	struct yaffs_cache *cache;
+	struct yaffs_dev *dev;
+
+	dev = in->my_dev;
+
+	while (n > 0) {
+		yaffs_addr_to_chunk(dev, offset, &chunk, &start);
+		chunk++;
+
+		/* OK now check for the curveball where the start and end are in
+		 * the same chunk.
+		 */
+		if ((start + n) < dev->data_bytes_per_chunk)
+			n_copy = n;
+		else
+			n_copy = dev->data_bytes_per_chunk - start;
+
+		cache = yaffs_find_chunk_cache(in, chunk);
+
+		/* If the chunk is already in the cache or it is less than
+		 * a whole chunk or we're using inband tags then use the cache
+		 * (if there is caching) else bypass the cache.
+		 */
+		if (cache || n_copy != (int)dev->data_bytes_per_chunk ||
+		    dev->param.inband_tags) {
+			if (dev->param.n_caches > 0) {
+
+				/* If we can't find the data in the cache,
+				 * then load it up. */
+
+				if (!cache) {
+					cache =
+					    yaffs_grab_chunk_cache(in->my_dev);
+					cache->object = in;
+					cache->chunk_id = chunk;
+					cache->dirty = 0;
+					cache->locked = 0;
+					yaffs_rd_data_obj(in, chunk,
+							  cache->data);
+					cache->n_bytes = 0;
+				}
+
+				yaffs_use_cache(dev, cache, 0);
+
+				cache->locked = 1;
+
+				memcpy(buffer, &cache->data[start], n_copy);
+
+				cache->locked = 0;
+			} else {
+				/* Read into the local buffer then copy.. */
+
+				u8 *local_buffer =
+				    yaffs_get_temp_buffer(dev);
+				yaffs_rd_data_obj(in, chunk, local_buffer);
+
+				memcpy(buffer, &local_buffer[start], n_copy);
+
+				yaffs_release_temp_buffer(dev, local_buffer);
+			}
+		} else {
+			/* A full chunk. Read directly into the buffer. */
+			yaffs_rd_data_obj(in, chunk, buffer);
+		}
+		n -= n_copy;
+		offset += n_copy;
+		buffer += n_copy;
+		n_done += n_copy;
+	}
+	return n_done;
+}
+
+int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
+		     int n_bytes, int write_through)
+{
+
+	int chunk;
+	u32 start;
+	int n_copy;
+	int n = n_bytes;
+	int n_done = 0;
+	int n_writeback;
+	loff_t start_write = offset;
+	int chunk_written = 0;
+	u32 n_bytes_read;
+	loff_t chunk_start;
+	struct yaffs_dev *dev;
+
+	dev = in->my_dev;
+
+	while (n > 0 && chunk_written >= 0) {
+		yaffs_addr_to_chunk(dev, offset, &chunk, &start);
+
+		if (((loff_t)chunk) *
+		    dev->data_bytes_per_chunk + start != offset ||
+		    start >= dev->data_bytes_per_chunk) {
+			yaffs_trace(YAFFS_TRACE_ERROR,
+				"AddrToChunk of offset %lld gives chunk %d start %d",
+				(long  long)offset, chunk, start);
+		}
+		chunk++;	/* File pos to chunk in file offset */
+
+		/* OK now check for the curveball where the start and end are in
+		 * the same chunk.
+		 */
+
+		if ((start + n) < dev->data_bytes_per_chunk) {
+			n_copy = n;
+
+			/* Now calculate how many bytes to write back....
+			 * If we're overwriting and not writing to then end of
+			 * file then we need to write back as much as was there
+			 * before.
+			 */
+
+			chunk_start = (((loff_t)(chunk - 1)) *
+					dev->data_bytes_per_chunk);
+
+			if (chunk_start > in->variant.file_variant.file_size)
+				n_bytes_read = 0;	/* Past end of file */
+			else
+				n_bytes_read =
+				    in->variant.file_variant.file_size -
+				    chunk_start;
+
+			if (n_bytes_read > dev->data_bytes_per_chunk)
+				n_bytes_read = dev->data_bytes_per_chunk;
+
+			n_writeback =
+			    (n_bytes_read >
+			     (start + n)) ? n_bytes_read : (start + n);
+
+			if (n_writeback < 0 ||
+			    n_writeback > (int)dev->data_bytes_per_chunk)
+				BUG();
+
+		} else {
+			n_copy = dev->data_bytes_per_chunk - start;
+			n_writeback = dev->data_bytes_per_chunk;
+		}
+
+		if (n_copy != (int)dev->data_bytes_per_chunk ||
+		    !dev->param.cache_bypass_aligned ||
+		    dev->param.inband_tags) {
+			/* An incomplete start or end chunk (or maybe both
+			 * start and end chunk), or we're using inband tags,
+			 * or we're forcing writes through the cache,
+			 * so we want to use the cache buffers.
+			 */
+			if (dev->param.n_caches > 0) {
+				struct yaffs_cache *cache;
+
+				/* If we can't find the data in the cache, then
+				 * load the cache */
+				cache = yaffs_find_chunk_cache(in, chunk);
+
+				if (!cache &&
+				    yaffs_check_alloc_available(dev, 1)) {
+					cache = yaffs_grab_chunk_cache(dev);
+					cache->object = in;
+					cache->chunk_id = chunk;
+					cache->dirty = 0;
+					cache->locked = 0;
+					yaffs_rd_data_obj(in, chunk,
+							  cache->data);
+				} else if (cache &&
+					   !cache->dirty &&
+					   !yaffs_check_alloc_available(dev,
+									1)) {
+					/* Drop the cache if it was a read cache
+					 * item and no space check has been made
+					 * for it.
+					 */
+					cache = NULL;
+				}
+
+				if (cache) {
+					yaffs_use_cache(dev, cache, 1);
+					cache->locked = 1;
+
+					memcpy(&cache->data[start], buffer,
+					       n_copy);
+
+					cache->locked = 0;
+					cache->n_bytes = n_writeback;
+
+					if (write_through) {
+						chunk_written =
+						    yaffs_wr_data_obj
+						    (cache->object,
+						     cache->chunk_id,
+						     cache->data,
+						     cache->n_bytes, 1);
+						cache->dirty = 0;
+					}
+				} else {
+					chunk_written = -1;	/* fail write */
+				}
+			} else {
+				/* An incomplete start or end chunk (or maybe
+				 * both start and end chunk). Read into the
+				 * local buffer then copy over and write back.
+				 */
+
+				u8 *local_buffer = yaffs_get_temp_buffer(dev);
+
+				yaffs_rd_data_obj(in, chunk, local_buffer);
+				memcpy(&local_buffer[start], buffer, n_copy);
+
+				chunk_written =
+				    yaffs_wr_data_obj(in, chunk,
+						      local_buffer,
+						      n_writeback, 0);
+
+				yaffs_release_temp_buffer(dev, local_buffer);
+			}
+		} else {
+			/* A full chunk. Write directly from the buffer. */
+
+			chunk_written =
+			    yaffs_wr_data_obj(in, chunk, buffer,
+					      dev->data_bytes_per_chunk, 0);
+
+			/* Since we've overwritten the cached data,
+			 * we better invalidate it. */
+			yaffs_invalidate_chunk_cache(in, chunk);
+		}
+
+		if (chunk_written >= 0) {
+			n -= n_copy;
+			offset += n_copy;
+			buffer += n_copy;
+			n_done += n_copy;
+		}
+	}
+
+	/* Update file object */
+
+	if ((start_write + n_done) > in->variant.file_variant.file_size)
+		in->variant.file_variant.file_size = (start_write + n_done);
+
+	in->dirty = 1;
+	return n_done;
+}
+
+int yaffs_wr_file(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
+		  int n_bytes, int write_through)
+{
+	yaffs2_handle_hole(in, offset);
+	return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through);
+}
+
+/* ---------------------- File resizing stuff ------------------ */
+
+static void yaffs_prune_chunks(struct yaffs_obj *in, loff_t new_size)
+{
+
+	struct yaffs_dev *dev = in->my_dev;
+	loff_t old_size = in->variant.file_variant.file_size;
+	int i;
+	int chunk_id;
+	u32 dummy;
+	int last_del;
+	int start_del;
+
+	if (old_size > 0)
+		yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy);
+	else
+		last_del = 0;
+
+	yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1,
+				&start_del, &dummy);
+	last_del++;
+	start_del++;
+
+	/* Delete backwards so that we don't end up with holes if
+	 * power is lost part-way through the operation.
+	 */
+	for (i = last_del; i >= start_del; i--) {
+		/* NB this could be optimised somewhat,
+		 * eg. could retrieve the tags and write them without
+		 * using yaffs_chunk_del
+		 */
+
+		chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
+
+		if (chunk_id < 1)
+			continue;
+
+		if ((u32)chunk_id <
+		    (dev->internal_start_block * dev->param.chunks_per_block) ||
+		    (u32)chunk_id >=
+		    ((dev->internal_end_block + 1) *
+		      dev->param.chunks_per_block)) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"Found daft chunk_id %d for %d",
+				chunk_id, i);
+		} else {
+			in->n_data_chunks--;
+			yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
+		}
+	}
+}
+
+void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size)
+{
+	int new_full;
+	u32 new_partial;
+	struct yaffs_dev *dev = obj->my_dev;
+
+	yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
+
+	yaffs_prune_chunks(obj, new_size);
+
+	if (new_partial != 0) {
+		int last_chunk = 1 + new_full;
+		u8 *local_buffer = yaffs_get_temp_buffer(dev);
+
+		/* Rewrite the last chunk with its new size and zero pad */
+		yaffs_rd_data_obj(obj, last_chunk, local_buffer);
+		memset(local_buffer + new_partial, 0,
+		       dev->data_bytes_per_chunk - new_partial);
+
+		yaffs_wr_data_obj(obj, last_chunk, local_buffer,
+				  new_partial, 1);
+
+		yaffs_release_temp_buffer(dev, local_buffer);
+	}
+
+	obj->variant.file_variant.file_size = new_size;
+	obj->variant.file_variant.stored_size = new_size;
+
+	yaffs_prune_tree(dev, &obj->variant.file_variant);
+}
+
+int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size)
+{
+	struct yaffs_dev *dev = in->my_dev;
+	loff_t old_size = in->variant.file_variant.file_size;
+
+	yaffs_flush_file_cache(in, 1);
+	yaffs_invalidate_whole_cache(in);
+
+	yaffs_check_gc(dev, 0);
+
+	if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
+		return YAFFS_FAIL;
+
+	if (new_size == old_size)
+		return YAFFS_OK;
+
+	if (new_size > old_size) {
+		yaffs2_handle_hole(in, new_size);
+		in->variant.file_variant.file_size = new_size;
+	} else {
+		/* new_size < old_size */
+		yaffs_resize_file_down(in, new_size);
+	}
+
+	/* Write a new object header to reflect the resize.
+	 * show we've shrunk the file, if need be
+	 * Do this only if the file is not in the deleted directories
+	 * and is not shadowed.
+	 */
+	if (in->parent &&
+	    !in->is_shadowed &&
+	    in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
+	    in->parent->obj_id != YAFFS_OBJECTID_DELETED)
+		yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
+
+	return YAFFS_OK;
+}
+
+int yaffs_flush_file(struct yaffs_obj *in,
+		     int update_time,
+		     int data_sync,
+		     int discard_cache)
+{
+	if (!in->dirty)
+		return YAFFS_OK;
+
+	yaffs_flush_file_cache(in, discard_cache);
+
+	if (data_sync)
+		return YAFFS_OK;
+
+	if (update_time)
+		yaffs_load_current_time(in, 0, 0);
+
+	return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ?
+				YAFFS_OK : YAFFS_FAIL;
+}
+
+
+/* yaffs_del_file deletes the whole file data
+ * and the inode associated with the file.
+ * It does not delete the links associated with the file.
+ */
+static int yaffs_unlink_file_if_needed(struct yaffs_obj *in)
+{
+	int ret_val;
+	int del_now = 0;
+	struct yaffs_dev *dev = in->my_dev;
+
+	if (!in->my_inode)
+		del_now = 1;
+
+	if (del_now) {
+		ret_val =
+		    yaffs_change_obj_name(in, in->my_dev->del_dir,
+					  _Y("deleted"), 0, 0);
+		yaffs_trace(YAFFS_TRACE_TRACING,
+			"yaffs: immediate deletion of file %d",
+			in->obj_id);
+		in->deleted = 1;
+		in->my_dev->n_deleted_files++;
+		if (dev->param.disable_soft_del || dev->param.is_yaffs2)
+			yaffs_resize_file(in, 0);
+		yaffs_soft_del_file(in);
+	} else {
+		ret_val =
+		    yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
+					  _Y("unlinked"), 0, 0);
+	}
+	return ret_val;
+}
+
+static int yaffs_del_file(struct yaffs_obj *in)
+{
+	int ret_val = YAFFS_OK;
+	int deleted;	/* Need to cache value on stack if in is freed */
+	struct yaffs_dev *dev = in->my_dev;
+
+	if (dev->param.disable_soft_del || dev->param.is_yaffs2)
+		yaffs_resize_file(in, 0);
+
+	if (in->n_data_chunks > 0) {
+		/* Use soft deletion if there is data in the file.
+		 * That won't be the case if it has been resized to zero.
+		 */
+		if (!in->unlinked)
+			ret_val = yaffs_unlink_file_if_needed(in);
+
+		deleted = in->deleted;
+
+		if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
+			in->deleted = 1;
+			deleted = 1;
+			in->my_dev->n_deleted_files++;
+			yaffs_soft_del_file(in);
+		}
+		return deleted ? YAFFS_OK : YAFFS_FAIL;
+	} else {
+		/* The file has no data chunks so we toss it immediately */
+		yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
+		in->variant.file_variant.top = NULL;
+		yaffs_generic_obj_del(in);
+
+		return YAFFS_OK;
+	}
+}
+
+int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
+{
+	return (obj &&
+		obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
+		!(list_empty(&obj->variant.dir_variant.children));
+}
+
+static int yaffs_del_dir(struct yaffs_obj *obj)
+{
+	/* First check that the directory is empty. */
+	if (yaffs_is_non_empty_dir(obj))
+		return YAFFS_FAIL;
+
+	return yaffs_generic_obj_del(obj);
+}
+
+static int yaffs_del_symlink(struct yaffs_obj *in)
+{
+	kfree(in->variant.symlink_variant.alias);
+	in->variant.symlink_variant.alias = NULL;
+
+	return yaffs_generic_obj_del(in);
+}
+
+static int yaffs_del_link(struct yaffs_obj *in)
+{
+	/* remove this hardlink from the list associated with the equivalent
+	 * object
+	 */
+	list_del_init(&in->hard_links);
+	return yaffs_generic_obj_del(in);
+}
+
+int yaffs_del_obj(struct yaffs_obj *obj)
+{
+	int ret_val = -1;
+
+	switch (obj->variant_type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		ret_val = yaffs_del_file(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		if (!list_empty(&obj->variant.dir_variant.dirty)) {
+			yaffs_trace(YAFFS_TRACE_BACKGROUND,
+				"Remove object %d from dirty directories",
+				obj->obj_id);
+			list_del_init(&obj->variant.dir_variant.dirty);
+		}
+		return yaffs_del_dir(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		ret_val = yaffs_del_symlink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		ret_val = yaffs_del_link(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		ret_val = yaffs_generic_obj_del(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		ret_val = 0;
+		break;		/* should not happen. */
+	}
+	return ret_val;
+}
+
+
+static void yaffs_empty_dir_to_dir(struct yaffs_obj *from_dir,
+				   struct yaffs_obj *to_dir)
+{
+	struct yaffs_obj *obj;
+	struct list_head *lh;
+	struct list_head *n;
+
+	list_for_each_safe(lh, n, &from_dir->variant.dir_variant.children) {
+		obj = list_entry(lh, struct yaffs_obj, siblings);
+		yaffs_add_obj_to_dir(to_dir, obj);
+	}
+}
+
+struct yaffs_obj *yaffs_retype_obj(struct yaffs_obj *obj,
+				   enum yaffs_obj_type type)
+{
+	/* Tear down the old variant */
+	switch (obj->variant_type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		/* Nuke file data */
+		yaffs_resize_file(obj, 0);
+		yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top);
+		obj->variant.file_variant.top = NULL;
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		/* Put the children in lost and found. */
+		yaffs_empty_dir_to_dir(obj, obj->my_dev->lost_n_found);
+		if (!list_empty(&obj->variant.dir_variant.dirty))
+			list_del_init(&obj->variant.dir_variant.dirty);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		/* Nuke symplink data */
+		kfree(obj->variant.symlink_variant.alias);
+		obj->variant.symlink_variant.alias = NULL;
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		list_del_init(&obj->hard_links);
+		break;
+	default:
+		break;
+	}
+
+	memset(&obj->variant, 0, sizeof(obj->variant));
+
+	/*Set up new variant if the memset is not enough. */
+	switch (type) {
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		INIT_LIST_HEAD(&obj->variant.dir_variant.children);
+		INIT_LIST_HEAD(&obj->variant.dir_variant.dirty);
+		break;
+	case YAFFS_OBJECT_TYPE_FILE:
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+	default:
+		break;
+	}
+
+	obj->variant_type = type;
+
+	return obj;
+
+}
+
+static int yaffs_unlink_worker(struct yaffs_obj *obj)
+{
+	int del_now = 0;
+
+	if (!obj)
+		return YAFFS_FAIL;
+
+	if (!obj->my_inode)
+		del_now = 1;
+
+	yaffs_update_parent(obj->parent);
+
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
+		return yaffs_del_link(obj);
+	} else if (!list_empty(&obj->hard_links)) {
+		/* Curve ball: We're unlinking an object that has a hardlink.
+		 *
+		 * This problem arises because we are not strictly following
+		 * The Linux link/inode model.
+		 *
+		 * We can't really delete the object.
+		 * Instead, we do the following:
+		 * - Select a hardlink.
+		 * - Unhook it from the hard links
+		 * - Move it from its parent directory so that the rename works.
+		 * - Rename the object to the hardlink's name.
+		 * - Delete the hardlink
+		 */
+
+		struct yaffs_obj *hl;
+		struct yaffs_obj *parent;
+		int ret_val;
+		YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+
+		hl = list_entry(obj->hard_links.next, struct yaffs_obj,
+				hard_links);
+
+		yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
+		parent = hl->parent;
+
+		list_del_init(&hl->hard_links);
+
+		yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
+
+		ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
+
+		if (ret_val == YAFFS_OK)
+			ret_val = yaffs_generic_obj_del(hl);
+
+		return ret_val;
+
+	} else if (del_now) {
+		switch (obj->variant_type) {
+		case YAFFS_OBJECT_TYPE_FILE:
+			return yaffs_del_file(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+			list_del_init(&obj->variant.dir_variant.dirty);
+			return yaffs_del_dir(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			return yaffs_del_symlink(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+			return yaffs_generic_obj_del(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+		default:
+			return YAFFS_FAIL;
+		}
+	} else if (yaffs_is_non_empty_dir(obj)) {
+		return YAFFS_FAIL;
+	} else {
+		return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
+						_Y("unlinked"), 0, 0);
+	}
+}
+
+int yaffs_unlink_obj(struct yaffs_obj *obj)
+{
+	if (obj && obj->unlink_allowed)
+		return yaffs_unlink_worker(obj);
+
+	return YAFFS_FAIL;
+}
+
+int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name)
+{
+	struct yaffs_obj *obj;
+
+	obj = yaffs_find_by_name(dir, name);
+	return yaffs_unlink_obj(obj);
+}
+
+/* Note:
+ * If old_name is NULL then we take old_dir as the object to be renamed.
+ */
+int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name,
+		     struct yaffs_obj *new_dir, const YCHAR *new_name)
+{
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *existing_target = NULL;
+	int force = 0;
+	int result;
+	struct yaffs_dev *dev;
+
+	if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		BUG();
+		return YAFFS_FAIL;
+	}
+	if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		BUG();
+		return YAFFS_FAIL;
+	}
+
+	dev = old_dir->my_dev;
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+	/* Special case for case insemsitive systems.
+	 * While look-up is case insensitive, the name isn't.
+	 * Therefore we might want to change x.txt to X.txt
+	 */
+	if (old_dir == new_dir &&
+		old_name && new_name &&
+		strcmp(old_name, new_name) == 0)
+		force = 1;
+#endif
+
+	if (strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
+	    YAFFS_MAX_NAME_LENGTH)
+		/* ENAMETOOLONG */
+		return YAFFS_FAIL;
+
+	if (old_name)
+		obj = yaffs_find_by_name(old_dir, old_name);
+	else{
+		obj = old_dir;
+		old_dir = obj->parent;
+	}
+
+	if (obj && obj->rename_allowed) {
+		/* Now handle an existing target, if there is one */
+		existing_target = yaffs_find_by_name(new_dir, new_name);
+		if (yaffs_is_non_empty_dir(existing_target)) {
+			return YAFFS_FAIL;	/* ENOTEMPTY */
+		} else if (existing_target && existing_target != obj) {
+			/* Nuke the target first, using shadowing,
+			 * but only if it isn't the same object.
+			 *
+			 * Note we must disable gc here otherwise it can mess
+			 * up the shadowing.
+			 *
+			 */
+			dev->gc_disable = 1;
+			yaffs_change_obj_name(obj, new_dir, new_name, force,
+					      existing_target->obj_id);
+			existing_target->is_shadowed = 1;
+			yaffs_unlink_obj(existing_target);
+			dev->gc_disable = 0;
+		}
+
+		result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
+
+		yaffs_update_parent(old_dir);
+		if (new_dir != old_dir)
+			yaffs_update_parent(new_dir);
+
+		return result;
+	}
+	return YAFFS_FAIL;
+}
+
+/*----------------------- Initialisation Scanning ---------------------- */
+
+void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
+			       int backward_scanning)
+{
+	struct yaffs_obj *obj;
+
+	if (backward_scanning) {
+		/* Handle YAFFS2 case (backward scanning)
+		 * If the shadowed object exists then ignore.
+		 */
+		obj = yaffs_find_by_number(dev, obj_id);
+		if (obj)
+			return;
+	}
+
+	/* Let's create it (if it does not exist) assuming it is a file so that
+	 * it can do shrinking etc.
+	 * We put it in unlinked dir to be cleaned up after the scanning
+	 */
+	obj =
+	    yaffs_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
+	if (!obj)
+		return;
+	obj->is_shadowed = 1;
+	yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
+	obj->variant.file_variant.shrink_size = 0;
+	obj->valid = 1;		/* So that we don't read any other info. */
+}
+
+void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list)
+{
+	struct list_head *lh;
+	struct list_head *save;
+	struct yaffs_obj *hl;
+	struct yaffs_obj *in;
+
+	list_for_each_safe(lh, save, hard_list) {
+		hl = list_entry(lh, struct yaffs_obj, hard_links);
+		in = yaffs_find_by_number(dev,
+					hl->variant.hardlink_variant.equiv_id);
+
+		if (in) {
+			/* Add the hardlink pointers */
+			hl->variant.hardlink_variant.equiv_obj = in;
+			list_add(&hl->hard_links, &in->hard_links);
+		} else {
+			/* Todo Need to report/handle this better.
+			 * Got a problem... hardlink to a non-existant object
+			 */
+			hl->variant.hardlink_variant.equiv_obj = NULL;
+			INIT_LIST_HEAD(&hl->hard_links);
+		}
+	}
+}
+
+static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
+{
+	/*
+	 *  Sort out state of unlinked and deleted objects after scanning.
+	 */
+	struct list_head *i;
+	struct list_head *n;
+	struct yaffs_obj *l;
+
+	if (dev->read_only)
+		return;
+
+	/* Soft delete all the unlinked files */
+	list_for_each_safe(i, n,
+			   &dev->unlinked_dir->variant.dir_variant.children) {
+		l = list_entry(i, struct yaffs_obj, siblings);
+		yaffs_del_obj(l);
+	}
+
+	list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
+		l = list_entry(i, struct yaffs_obj, siblings);
+		yaffs_del_obj(l);
+	}
+}
+
+/*
+ * This code iterates through all the objects making sure that they are rooted.
+ * Any unrooted objects are re-rooted in lost+found.
+ * An object needs to be in one of:
+ * - Directly under deleted, unlinked
+ * - Directly or indirectly under root.
+ *
+ * Note:
+ *  This code assumes that we don't ever change the current relationships
+ *  between directories:
+ *   root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
+ *   lost-n-found->parent == root_dir
+ *
+ * This fixes the problem where directories might have inadvertently been
+ * deleted leaving the object "hanging" without being rooted in the
+ * directory tree.
+ */
+
+static int yaffs_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
+{
+	return (obj == dev->del_dir ||
+		obj == dev->unlinked_dir || obj == dev->root_dir);
+}
+
+static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_obj *parent;
+	int i;
+	struct list_head *lh;
+	struct list_head *n;
+	int depth_limit;
+	int hanging;
+
+	if (dev->read_only)
+		return;
+
+	/* Iterate through the objects in each hash entry,
+	 * looking at each object.
+	 * Make sure it is rooted.
+	 */
+
+	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+		list_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
+			obj = list_entry(lh, struct yaffs_obj, hash_link);
+			parent = obj->parent;
+
+			if (yaffs_has_null_parent(dev, obj)) {
+				/* These directories are not hanging */
+				hanging = 0;
+			} else if (!parent ||
+				   parent->variant_type !=
+				   YAFFS_OBJECT_TYPE_DIRECTORY) {
+				hanging = 1;
+			} else if (yaffs_has_null_parent(dev, parent)) {
+				hanging = 0;
+			} else {
+				/*
+				 * Need to follow the parent chain to
+				 * see if it is hanging.
+				 */
+				hanging = 0;
+				depth_limit = 100;
+
+				while (parent != dev->root_dir &&
+				       parent->parent &&
+				       parent->parent->variant_type ==
+				       YAFFS_OBJECT_TYPE_DIRECTORY &&
+				       depth_limit > 0) {
+					parent = parent->parent;
+					depth_limit--;
+				}
+				if (parent != dev->root_dir)
+					hanging = 1;
+			}
+			if (hanging) {
+				yaffs_trace(YAFFS_TRACE_SCAN,
+					"Hanging object %d moved to lost and found",
+					obj->obj_id);
+				yaffs_add_obj_to_dir(dev->lost_n_found, obj);
+			}
+		}
+	}
+}
+
+/*
+ * Delete directory contents for cleaning up lost and found.
+ */
+static void yaffs_del_dir_contents(struct yaffs_obj *dir)
+{
+	struct yaffs_obj *obj;
+	struct list_head *lh;
+	struct list_head *n;
+
+	if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
+		BUG();
+
+	list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
+		obj = list_entry(lh, struct yaffs_obj, siblings);
+		if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
+			yaffs_del_dir_contents(obj);
+		yaffs_trace(YAFFS_TRACE_SCAN,
+			"Deleting lost_found object %d",
+			obj->obj_id);
+		yaffs_unlink_obj(obj);
+	}
+}
+
+static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
+{
+	yaffs_del_dir_contents(dev->lost_n_found);
+}
+
+
+struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
+				     const YCHAR *name)
+{
+	int sum;
+	struct list_head *i;
+	YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
+	struct yaffs_obj *l;
+
+	if (!name)
+		return NULL;
+
+	if (!directory) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"tragedy: yaffs_find_by_name: null pointer directory"
+			);
+		BUG();
+		return NULL;
+	}
+	if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"tragedy: yaffs_find_by_name: non-directory"
+			);
+		BUG();
+	}
+
+	sum = yaffs_calc_name_sum(name);
+
+	list_for_each(i, &directory->variant.dir_variant.children) {
+		l = list_entry(i, struct yaffs_obj, siblings);
+
+		if (l->parent != directory)
+			BUG();
+
+		yaffs_check_obj_details_loaded(l);
+
+		/* Special case for lost-n-found */
+		if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
+			if (!strcmp(name, YAFFS_LOSTNFOUND_NAME))
+				return l;
+		} else if (l->sum == sum || l->hdr_chunk <= 0) {
+			/* LostnFound chunk called Objxxx
+			 * Do a real check
+			 */
+			yaffs_get_obj_name(l, buffer,
+				YAFFS_MAX_NAME_LENGTH + 1);
+			if (!strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH))
+				return l;
+		}
+	}
+	return NULL;
+}
+
+/* GetEquivalentObject dereferences any hard links to get to the
+ * actual object.
+ */
+
+struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
+{
+	if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
+		obj = obj->variant.hardlink_variant.equiv_obj;
+		yaffs_check_obj_details_loaded(obj);
+	}
+	return obj;
+}
+
+/*
+ *  A note or two on object names.
+ *  * If the object name is missing, we then make one up in the form objnnn
+ *
+ *  * ASCII names are stored in the object header's name field from byte zero
+ *  * Unicode names are historically stored starting from byte zero.
+ *
+ * Then there are automatic Unicode names...
+ * The purpose of these is to save names in a way that can be read as
+ * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
+ * system to share files.
+ *
+ * These automatic unicode are stored slightly differently...
+ *  - If the name can fit in the ASCII character space then they are saved as
+ *    ascii names as per above.
+ *  - If the name needs Unicode then the name is saved in Unicode
+ *    starting at oh->name[1].
+
+ */
+static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
+				int buffer_size)
+{
+	/* Create an object name if we could not find one. */
+	if (strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
+		YCHAR local_name[20];
+		YCHAR num_string[20];
+		YCHAR *x = &num_string[19];
+		unsigned v = obj->obj_id;
+		num_string[19] = 0;
+		while (v > 0) {
+			x--;
+			*x = '0' + (v % 10);
+			v /= 10;
+		}
+		/* make up a name */
+		strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
+		strcat(local_name, x);
+		strncpy(name, local_name, buffer_size - 1);
+	}
+}
+
+int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size)
+{
+	memset(name, 0, buffer_size * sizeof(YCHAR));
+	yaffs_check_obj_details_loaded(obj);
+	if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
+		strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
+	} else if (obj->short_name[0]) {
+		strcpy(name, obj->short_name);
+	} else if (obj->hdr_chunk > 0) {
+		int result;
+		u8 *buffer = yaffs_get_temp_buffer(obj->my_dev);
+
+		struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
+
+		memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
+
+		if (obj->hdr_chunk > 0) {
+			result = yaffs_rd_chunk_tags_nand(obj->my_dev,
+							  obj->hdr_chunk,
+							  buffer, NULL);
+		}
+		if (result == YAFFS_OK)
+			yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
+					buffer_size);
+
+		yaffs_release_temp_buffer(obj->my_dev, buffer);
+	}
+
+	yaffs_fix_null_name(obj, name, buffer_size);
+
+	return strnlen(name, YAFFS_MAX_NAME_LENGTH);
+}
+
+loff_t yaffs_get_obj_length(struct yaffs_obj *obj)
+{
+	/* Dereference any hard linking */
+	obj = yaffs_get_equivalent_obj(obj);
+
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+		return obj->variant.file_variant.file_size;
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
+		if (!obj->variant.symlink_variant.alias)
+			return 0;
+		return strnlen(obj->variant.symlink_variant.alias,
+				     YAFFS_MAX_ALIAS_LENGTH);
+	} else {
+		/* Only a directory should drop through to here */
+		return obj->my_dev->data_bytes_per_chunk;
+	}
+}
+
+int yaffs_get_obj_link_count(struct yaffs_obj *obj)
+{
+	int count = 0;
+	struct list_head *i;
+
+	if (!obj->unlinked)
+		count++;	/* the object itself */
+
+	list_for_each(i, &obj->hard_links)
+	    count++;		/* add the hard links; */
+
+	return count;
+}
+
+int yaffs_get_obj_inode(struct yaffs_obj *obj)
+{
+	obj = yaffs_get_equivalent_obj(obj);
+
+	return obj->obj_id;
+}
+
+unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
+{
+	obj = yaffs_get_equivalent_obj(obj);
+
+	switch (obj->variant_type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		return DT_REG;
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		return DT_DIR;
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		return DT_LNK;
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		return DT_REG;
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		if (S_ISFIFO(obj->yst_mode))
+			return DT_FIFO;
+		if (S_ISCHR(obj->yst_mode))
+			return DT_CHR;
+		if (S_ISBLK(obj->yst_mode))
+			return DT_BLK;
+		if (S_ISSOCK(obj->yst_mode))
+			return DT_SOCK;
+		return DT_REG;
+		break;
+	default:
+		return DT_REG;
+		break;
+	}
+}
+
+YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
+{
+	obj = yaffs_get_equivalent_obj(obj);
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
+		return yaffs_clone_str(obj->variant.symlink_variant.alias);
+	else
+		return yaffs_clone_str(_Y(""));
+}
+
+/*--------------------------- Initialisation code -------------------------- */
+
+static int yaffs_check_dev_fns(struct yaffs_dev *dev)
+{
+	struct yaffs_driver *drv = &dev->drv;
+	struct yaffs_tags_handler *tagger = &dev->tagger;
+
+	/* Common functions, gotta have */
+	if (!drv->drv_read_chunk_fn ||
+	    !drv->drv_write_chunk_fn ||
+	    !drv->drv_erase_fn)
+		return 0;
+
+	if (dev->param.is_yaffs2 &&
+	     (!drv->drv_mark_bad_fn  || !drv->drv_check_bad_fn))
+		return 0;
+
+	/* Install the default tags marshalling functions if needed. */
+	yaffs_tags_compat_install(dev);
+	yaffs_tags_marshall_install(dev);
+
+	/* Check we now have the marshalling functions required. */
+	if (!tagger->write_chunk_tags_fn ||
+	    !tagger->read_chunk_tags_fn ||
+	    !tagger->query_block_fn ||
+	    !tagger->mark_bad_fn)
+		return 0;
+
+	return 1;
+}
+
+static int yaffs_create_initial_dir(struct yaffs_dev *dev)
+{
+	/* Initialise the unlinked, deleted, root and lost+found directories */
+	dev->lost_n_found = NULL;
+	dev->root_dir = NULL;
+	dev->unlinked_dir = NULL;
+	dev->del_dir = NULL;
+
+	dev->unlinked_dir =
+	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
+	dev->del_dir =
+	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
+	dev->root_dir =
+	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
+				  YAFFS_ROOT_MODE | S_IFDIR);
+	dev->lost_n_found =
+	    yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
+				  YAFFS_LOSTNFOUND_MODE | S_IFDIR);
+
+	if (dev->lost_n_found &&
+		dev->root_dir &&
+		dev->unlinked_dir &&
+		dev->del_dir) {
+			/* If lost-n-found is hidden then yank it out of the directory tree. */
+			if (dev->param.hide_lost_n_found)
+				list_del_init(&dev->lost_n_found->siblings);
+			else
+				yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
+		return YAFFS_OK;
+	}
+	return YAFFS_FAIL;
+}
+
+/* Low level init.
+ * Typically only used by yaffs_guts_initialise, but also used by the
+ * Low level yaffs driver tests.
+ */
+
+int yaffs_guts_ll_init(struct yaffs_dev *dev)
+{
+
+
+	yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_ll_init()");
+
+	if (!dev) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"yaffs: Need a device"
+			);
+		return YAFFS_FAIL;
+	}
+
+	if (dev->ll_init)
+		return YAFFS_OK;
+
+	dev->internal_start_block = dev->param.start_block;
+	dev->internal_end_block = dev->param.end_block;
+	dev->block_offset = 0;
+	dev->chunk_offset = 0;
+	dev->n_free_chunks = 0;
+
+	dev->gc_block = 0;
+
+	if (dev->param.start_block == 0) {
+		dev->internal_start_block = dev->param.start_block + 1;
+		dev->internal_end_block = dev->param.end_block + 1;
+		dev->block_offset = 1;
+		dev->chunk_offset = dev->param.chunks_per_block;
+	}
+
+	/* Check geometry parameters. */
+
+	if ((!dev->param.inband_tags && dev->param.is_yaffs2 &&
+		dev->param.total_bytes_per_chunk < 1024) ||
+		(!dev->param.is_yaffs2 &&
+			dev->param.total_bytes_per_chunk < 512) ||
+		(dev->param.inband_tags && !dev->param.is_yaffs2) ||
+		 dev->param.chunks_per_block < 2 ||
+		 dev->param.n_reserved_blocks < 2 ||
+		dev->internal_start_block <= 0 ||
+		dev->internal_end_block <= 0 ||
+		dev->internal_end_block <=
+		(dev->internal_start_block + dev->param.n_reserved_blocks + 2)
+		) {
+		/* otherwise it is too small */
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
+			dev->param.total_bytes_per_chunk,
+			dev->param.is_yaffs2 ? "2" : "",
+			dev->param.inband_tags);
+		return YAFFS_FAIL;
+	}
+
+	/* Sort out space for inband tags, if required */
+	if (dev->param.inband_tags)
+		dev->data_bytes_per_chunk =
+		    dev->param.total_bytes_per_chunk -
+		    sizeof(struct yaffs_packed_tags2_tags_only);
+	else
+		dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
+
+	/* Got the right mix of functions? */
+	if (!yaffs_check_dev_fns(dev)) {
+		/* Function missing */
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"device function(s) missing or wrong");
+
+		return YAFFS_FAIL;
+	}
+
+	if (yaffs_init_nand(dev) != YAFFS_OK) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed");
+		return YAFFS_FAIL;
+	}
+
+	return YAFFS_OK;
+}
+
+
+int yaffs_guts_format_dev(struct yaffs_dev *dev)
+{
+	u32 i;
+	enum yaffs_block_state state;
+	u32 dummy;
+
+	if(yaffs_guts_ll_init(dev) != YAFFS_OK)
+		return YAFFS_FAIL;
+
+	if(dev->is_mounted)
+		return YAFFS_FAIL;
+
+	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		yaffs_query_init_block_state(dev, i, &state, &dummy);
+		if (state != YAFFS_BLOCK_STATE_DEAD)
+			yaffs_erase_block(dev, i);
+	}
+
+	return YAFFS_OK;
+}
+
+
+int yaffs_guts_initialise(struct yaffs_dev *dev)
+{
+	int init_failed = 0;
+	u32 x;
+	u32 bits;
+
+	if(yaffs_guts_ll_init(dev) != YAFFS_OK)
+		return YAFFS_FAIL;
+
+	if (dev->is_mounted) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted");
+		return YAFFS_FAIL;
+	}
+
+	dev->is_mounted = 1;
+
+	/* OK now calculate a few things for the device */
+
+	/*
+	 *  Calculate all the chunk size manipulation numbers:
+	 */
+	x = dev->data_bytes_per_chunk;
+	/* We always use dev->chunk_shift and dev->chunk_div */
+	dev->chunk_shift = calc_shifts(x);
+	x >>= dev->chunk_shift;
+	dev->chunk_div = x;
+	/* We only use chunk mask if chunk_div is 1 */
+	dev->chunk_mask = (1 << dev->chunk_shift) - 1;
+
+	/*
+	 * Calculate chunk_grp_bits.
+	 * We need to find the next power of 2 > than internal_end_block
+	 */
+
+	x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
+
+	bits = calc_shifts_ceiling(x);
+
+	/* Set up tnode width if wide tnodes are enabled. */
+	if (!dev->param.wide_tnodes_disabled) {
+		/* bits must be even so that we end up with 32-bit words */
+		if (bits & 1)
+			bits++;
+		if (bits < 16)
+			dev->tnode_width = 16;
+		else
+			dev->tnode_width = bits;
+	} else {
+		dev->tnode_width = 16;
+	}
+
+	dev->tnode_mask = (1 << dev->tnode_width) - 1;
+
+	/* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
+	 * so if the bitwidth of the
+	 * chunk range we're using is greater than 16 we need
+	 * to figure out chunk shift and chunk_grp_size
+	 */
+
+	if (bits <= dev->tnode_width)
+		dev->chunk_grp_bits = 0;
+	else
+		dev->chunk_grp_bits = bits - dev->tnode_width;
+
+	dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8;
+	if (dev->tnode_size < sizeof(struct yaffs_tnode))
+		dev->tnode_size = sizeof(struct yaffs_tnode);
+
+	dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
+
+	if (dev->param.chunks_per_block < dev->chunk_grp_size) {
+		/* We have a problem because the soft delete won't work if
+		 * the chunk group size > chunks per block.
+		 * This can be remedied by using larger "virtual blocks".
+		 */
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large");
+
+		return YAFFS_FAIL;
+	}
+
+	/* Finished verifying the device, continue with initialisation */
+
+	/* More device initialisation */
+	dev->all_gcs = 0;
+	dev->passive_gc_count = 0;
+	dev->oldest_dirty_gc_count = 0;
+	dev->bg_gcs = 0;
+	dev->gc_block_finder = 0;
+	dev->buffered_block = -1;
+	dev->doing_buffered_block_rewrite = 0;
+	dev->n_deleted_files = 0;
+	dev->n_bg_deletions = 0;
+	dev->n_unlinked_files = 0;
+	dev->n_ecc_fixed = 0;
+	dev->n_ecc_unfixed = 0;
+	dev->n_tags_ecc_fixed = 0;
+	dev->n_tags_ecc_unfixed = 0;
+	dev->n_erase_failures = 0;
+	dev->n_erased_blocks = 0;
+	dev->gc_disable = 0;
+	dev->has_pending_prioritised_gc = 1; /* Assume the worst for now,
+					      * will get fixed on first GC */
+	INIT_LIST_HEAD(&dev->dirty_dirs);
+	dev->oldest_dirty_seq = 0;
+	dev->oldest_dirty_block = 0;
+
+	yaffs_endian_config(dev);
+
+	/* Initialise temporary buffers and caches. */
+	if (!yaffs_init_tmp_buffers(dev))
+		init_failed = 1;
+
+	dev->cache = NULL;
+	dev->gc_cleanup_list = NULL;
+
+	if (!init_failed && dev->param.n_caches > 0) {
+		u32 i;
+		void *buf;
+		u32 cache_bytes =
+		    dev->param.n_caches * sizeof(struct yaffs_cache);
+
+		if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
+			dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
+
+		dev->cache = kmalloc(cache_bytes, GFP_NOFS);
+
+		buf = (u8 *) dev->cache;
+
+		if (dev->cache)
+			memset(dev->cache, 0, cache_bytes);
+
+		for (i = 0; i < dev->param.n_caches && buf; i++) {
+			dev->cache[i].object = NULL;
+			dev->cache[i].last_use = 0;
+			dev->cache[i].dirty = 0;
+			dev->cache[i].data = buf =
+			    kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
+		}
+		if (!buf)
+			init_failed = 1;
+
+		dev->cache_last_use = 0;
+	}
+
+	dev->cache_hits = 0;
+
+	if (!init_failed) {
+		dev->gc_cleanup_list =
+		    kmalloc(dev->param.chunks_per_block * sizeof(u32),
+					GFP_NOFS);
+		if (!dev->gc_cleanup_list)
+			init_failed = 1;
+	}
+
+	if (dev->param.is_yaffs2)
+		dev->param.use_header_file_size = 1;
+
+	if (!init_failed && !yaffs_init_blocks(dev))
+		init_failed = 1;
+
+	yaffs_init_tnodes_and_objs(dev);
+
+	if (!init_failed && !yaffs_create_initial_dir(dev))
+		init_failed = 1;
+
+	if (!init_failed && dev->param.is_yaffs2 &&
+		!dev->param.disable_summary &&
+		!yaffs_summary_init(dev))
+		init_failed = 1;
+
+	if (!init_failed) {
+		/* Now scan the flash. */
+		if (dev->param.is_yaffs2) {
+			if (yaffs2_checkpt_restore(dev)) {
+				yaffs_check_obj_details_loaded(dev->root_dir);
+				yaffs_trace(YAFFS_TRACE_CHECKPOINT |
+					YAFFS_TRACE_MOUNT,
+					"yaffs: restored from checkpoint"
+					);
+			} else {
+
+				/* Clean up the mess caused by an aborted
+				 * checkpoint load then scan backwards.
+				 */
+				yaffs_deinit_blocks(dev);
+
+				yaffs_deinit_tnodes_and_objs(dev);
+
+				dev->n_erased_blocks = 0;
+				dev->n_free_chunks = 0;
+				dev->alloc_block = -1;
+				dev->alloc_page = -1;
+				dev->n_deleted_files = 0;
+				dev->n_unlinked_files = 0;
+				dev->n_bg_deletions = 0;
+
+				if (!init_failed && !yaffs_init_blocks(dev))
+					init_failed = 1;
+
+				yaffs_init_tnodes_and_objs(dev);
+
+				if (!init_failed
+				    && !yaffs_create_initial_dir(dev))
+					init_failed = 1;
+
+				if (!init_failed && !yaffs2_scan_backwards(dev))
+					init_failed = 1;
+			}
+		} else if (!yaffs1_scan(dev)) {
+			init_failed = 1;
+		}
+
+		yaffs_strip_deleted_objs(dev);
+		yaffs_fix_hanging_objs(dev);
+		if (dev->param.empty_lost_n_found)
+			yaffs_empty_l_n_f(dev);
+	}
+
+	if (init_failed) {
+		/* Clean up the mess */
+		yaffs_trace(YAFFS_TRACE_TRACING,
+		  "yaffs: yaffs_guts_initialise() aborted.");
+
+		yaffs_deinitialise(dev);
+		return YAFFS_FAIL;
+	}
+
+	/* Zero out stats */
+	dev->n_page_reads = 0;
+	dev->n_page_writes = 0;
+	dev->n_erasures = 0;
+	dev->n_gc_copies = 0;
+	dev->n_retried_writes = 0;
+
+	dev->n_retired_blocks = 0;
+
+	yaffs_verify_free_chunks(dev);
+	yaffs_verify_blocks(dev);
+
+	/* Clean up any aborted checkpoint data */
+	if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
+		yaffs2_checkpt_invalidate(dev);
+
+	yaffs_trace(YAFFS_TRACE_TRACING,
+	  "yaffs: yaffs_guts_initialise() done.");
+	return YAFFS_OK;
+}
+
+void yaffs_deinitialise(struct yaffs_dev *dev)
+{
+	if (dev->is_mounted) {
+		u32 i;
+
+		yaffs_deinit_blocks(dev);
+		yaffs_deinit_tnodes_and_objs(dev);
+		yaffs_summary_deinit(dev);
+
+		if (dev->param.n_caches > 0 && dev->cache) {
+
+			for (i = 0; i < dev->param.n_caches; i++) {
+				kfree(dev->cache[i].data);
+				dev->cache[i].data = NULL;
+			}
+
+			kfree(dev->cache);
+			dev->cache = NULL;
+		}
+
+		kfree(dev->gc_cleanup_list);
+
+		for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+			kfree(dev->temp_buffer[i].buffer);
+			dev->temp_buffer[i].buffer = NULL;
+		}
+
+		kfree(dev->checkpt_buffer);
+		dev->checkpt_buffer = NULL;
+		kfree(dev->checkpt_block_list);
+		dev->checkpt_block_list = NULL;
+
+		dev->is_mounted = 0;
+
+		yaffs_deinit_nand(dev);
+	}
+}
+
+int yaffs_count_free_chunks(struct yaffs_dev *dev)
+{
+	int n_free = 0;
+	u32 b;
+	struct yaffs_block_info *blk;
+
+	blk = dev->block_info;
+	for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
+		switch (blk->block_state) {
+		case YAFFS_BLOCK_STATE_EMPTY:
+		case YAFFS_BLOCK_STATE_ALLOCATING:
+		case YAFFS_BLOCK_STATE_COLLECTING:
+		case YAFFS_BLOCK_STATE_FULL:
+			n_free +=
+			    (dev->param.chunks_per_block - blk->pages_in_use +
+			     blk->soft_del_pages);
+			break;
+		default:
+			break;
+		}
+		blk++;
+	}
+	return n_free;
+}
+
+int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
+{
+	/* This is what we report to the outside world */
+	int n_free;
+	int n_dirty_caches;
+	int blocks_for_checkpt;
+	u32 i;
+
+	n_free = dev->n_free_chunks;
+	n_free += dev->n_deleted_files;
+
+	/* Now count and subtract the number of dirty chunks in the cache. */
+
+	for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
+		if (dev->cache[i].dirty)
+			n_dirty_caches++;
+	}
+
+	n_free -= n_dirty_caches;
+
+	n_free -=
+	    ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
+
+	/* Now figure checkpoint space and report that... */
+	blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
+
+	n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);
+
+	if (n_free < 0)
+		n_free = 0;
+
+	return n_free;
+}
+
+
+/*
+ * Marshalling functions to get loff_t file sizes into and out of
+ * object headers.
+ */
+void yaffs_oh_size_load(struct yaffs_dev *dev,
+			struct yaffs_obj_hdr *oh,
+			loff_t fsize,
+			int do_endian)
+{
+	oh->file_size_low = FSIZE_LOW(fsize);
+
+	oh->file_size_high = FSIZE_HIGH(fsize);
+
+	if (do_endian) {
+		yaffs_do_endian_u32(dev, &oh->file_size_low);
+		yaffs_do_endian_u32(dev, &oh->file_size_high);
+	}
+}
+
+loff_t yaffs_oh_to_size(struct yaffs_dev *dev, struct yaffs_obj_hdr *oh,
+			int do_endian)
+{
+	loff_t retval;
+
+
+	if (sizeof(loff_t) >= 8 && ~(oh->file_size_high)) {
+		u32 low = oh->file_size_low;
+		u32 high = oh->file_size_high;
+
+		if (do_endian) {
+			yaffs_do_endian_u32 (dev, &low);
+			yaffs_do_endian_u32 (dev, &high);
+		}
+		retval = FSIZE_COMBINE(high, low);
+	} else {
+		u32 low = oh->file_size_low;
+
+		if (do_endian)
+			yaffs_do_endian_u32(dev, &low);
+		retval = (loff_t)low;
+	}
+
+	return retval;
+}
+
+
+void yaffs_count_blocks_by_state(struct yaffs_dev *dev, int bs[10])
+{
+	u32 i;
+	struct yaffs_block_info *bi;
+	int s;
+
+	for(i = 0; i < 10; i++)
+		bs[i] = 0;
+
+	for(i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		bi = yaffs_get_block_info(dev, i);
+		s = bi->block_state;
+		if(s > YAFFS_BLOCK_STATE_DEAD || s < YAFFS_BLOCK_STATE_UNKNOWN)
+			bs[0]++;
+		else
+			bs[s]++;
+	}
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_guts.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_guts.h
--- linux-4.13.3/fs/yaffs2/yaffs_guts.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_guts.h	2018-01-10 15:09:56.577935391 +0800
@@ -0,0 +1,1070 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_GUTS_H__
+#define __YAFFS_GUTS_H__
+
+#include "yportenv.h"
+
+#define YAFFS_OK	1
+#define YAFFS_FAIL  0
+
+/* Give us a  Y=0x59,
+ * Give us an A=0x41,
+ * Give us an FF=0xff
+ * Give us an S=0x53
+ * And what have we got...
+ */
+#define YAFFS_MAGIC			0x5941ff53
+
+/*
+ * Tnodes form a tree with the tnodes in "levels"
+ * Levels greater than 0 hold 8 slots which point to other tnodes.
+ * Those at level 0 hold 16 slots which point to chunks in NAND.
+ *
+ * A maximum level of 8 thust supports files of size up to:
+ *
+ * 2^(3*MAX_LEVEL+4)
+ *
+ * Thus a max level of 8 supports files with up to 2^^28 chunks which gives
+ * a maximum file size of around 512Gbytees with 2k chunks.
+ */
+#define YAFFS_NTNODES_LEVEL0		16
+#define YAFFS_TNODES_LEVEL0_BITS	4
+#define YAFFS_TNODES_LEVEL0_MASK	0xf
+
+#define YAFFS_NTNODES_INTERNAL		(YAFFS_NTNODES_LEVEL0 / 2)
+#define YAFFS_TNODES_INTERNAL_BITS	(YAFFS_TNODES_LEVEL0_BITS - 1)
+#define YAFFS_TNODES_INTERNAL_MASK	0x7
+#define YAFFS_TNODES_MAX_LEVEL		8
+#define YAFFS_TNODES_MAX_BITS		(YAFFS_TNODES_LEVEL0_BITS + \
+					YAFFS_TNODES_INTERNAL_BITS * \
+					YAFFS_TNODES_MAX_LEVEL)
+#define YAFFS_MAX_CHUNK_ID		((1 << YAFFS_TNODES_MAX_BITS) - 1)
+
+#define YAFFS_MAX_FILE_SIZE_32		0x7fffffff
+
+/* Constants for YAFFS1 mode */
+#define YAFFS_BYTES_PER_SPARE		16
+#define YAFFS_BYTES_PER_CHUNK		512
+#define YAFFS_CHUNK_SIZE_SHIFT		9
+#define YAFFS_CHUNKS_PER_BLOCK		32
+#define YAFFS_BYTES_PER_BLOCK	(YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)
+
+#define YAFFS_MIN_YAFFS2_CHUNK_SIZE	1024
+#define YAFFS_MIN_YAFFS2_SPARE_SIZE	32
+
+
+
+#define YAFFS_ALLOCATION_NOBJECTS	100
+#define YAFFS_ALLOCATION_NTNODES	100
+#define YAFFS_ALLOCATION_NLINKS		100
+
+#define YAFFS_NOBJECT_BUCKETS		256
+
+#define YAFFS_OBJECT_SPACE		0x40000
+#define YAFFS_MAX_OBJECT_ID		(YAFFS_OBJECT_SPACE - 1)
+
+/* Binary data version stamps */
+#define YAFFS_SUMMARY_VERSION		1
+
+#ifdef CONFIG_YAFFS_UNICODE
+#define YAFFS_MAX_NAME_LENGTH		127
+#define YAFFS_MAX_ALIAS_LENGTH		79
+#else
+#define YAFFS_MAX_NAME_LENGTH		255
+#define YAFFS_MAX_ALIAS_LENGTH		159
+#endif
+
+#define YAFFS_SHORT_NAME_LENGTH		15
+
+/* Some special object ids for pseudo objects */
+#define YAFFS_OBJECTID_ROOT		1
+#define YAFFS_OBJECTID_LOSTNFOUND	2
+#define YAFFS_OBJECTID_UNLINKED		3
+#define YAFFS_OBJECTID_DELETED		4
+
+/* Fake object Id for summary data */
+#define YAFFS_OBJECTID_SUMMARY		0x10
+
+/* Pseudo object ids for checkpointing */
+#define YAFFS_OBJECTID_CHECKPOINT_DATA	0x20
+#define YAFFS_SEQUENCE_CHECKPOINT_DATA	0x21
+
+#define YAFFS_MAX_SHORT_OP_CACHES	20
+
+#define YAFFS_N_TEMP_BUFFERS		6
+
+/* We limit the number attempts at sucessfully saving a chunk of data.
+ * Small-page devices have 32 pages per block; large-page devices have 64.
+ * Default to something in the order of 5 to 10 blocks worth of chunks.
+ */
+#define YAFFS_WR_ATTEMPTS		(5*64)
+
+/* Sequence numbers are used in YAFFS2 to determine block allocation order.
+ * The range is limited slightly to help distinguish bad numbers from good.
+ * This also allows us to perhaps in the future use special numbers for
+ * special purposes.
+ * EFFFFF00 allows the allocation of 8 blocks/second (~1Mbytes) for 15 years,
+ * and is a larger number than the lifetime of a 2GB device.
+ */
+#define YAFFS_LOWEST_SEQUENCE_NUMBER	0x00001000
+#define YAFFS_HIGHEST_SEQUENCE_NUMBER	0xefffff00
+
+/* Special sequence number for bad block that failed to be marked bad */
+#define YAFFS_SEQUENCE_BAD_BLOCK	0xffff0000
+
+/* ChunkCache is used for short read/write operations.*/
+struct yaffs_cache {
+	struct yaffs_obj *object;
+	int chunk_id;
+	int last_use;
+	int dirty;
+	int n_bytes;		/* Only valid if the cache is dirty */
+	int locked;		/* Can't push out or flush while locked. */
+	u8 *data;
+};
+
+/* yaffs1 tags structures in RAM
+ * NB This uses bitfield. Bitfields should not straddle a u32 boundary
+ * otherwise the structure size will get blown out.
+ */
+
+struct yaffs_tags {
+	u32 chunk_id:20;
+	u32 serial_number:2;
+	u32 n_bytes_lsb:10;
+	u32 obj_id:18;
+	u32 ecc:12;
+	u32 n_bytes_msb:2;
+};
+
+union yaffs_tags_union {
+	struct yaffs_tags as_tags;
+	u8  as_bytes[8];
+	u32 as_u32[2];
+};
+
+
+/* Stuff used for extended tags in YAFFS2 */
+
+enum yaffs_ecc_result {
+	YAFFS_ECC_RESULT_UNKNOWN,
+	YAFFS_ECC_RESULT_NO_ERROR,
+	YAFFS_ECC_RESULT_FIXED,
+	YAFFS_ECC_RESULT_UNFIXED
+};
+
+/*
+ * Object type enum:
+ * When this is stored in flash we store it as a u32 instead
+ * to prevent any alignment change issues as compiler variants change.
+ */
+
+enum yaffs_obj_type {
+	YAFFS_OBJECT_TYPE_UNKNOWN,
+	YAFFS_OBJECT_TYPE_FILE,
+	YAFFS_OBJECT_TYPE_SYMLINK,
+	YAFFS_OBJECT_TYPE_DIRECTORY,
+	YAFFS_OBJECT_TYPE_HARDLINK,
+	YAFFS_OBJECT_TYPE_SPECIAL
+};
+
+#define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL
+
+struct yaffs_ext_tags {
+	unsigned chunk_used;	/*  Status of the chunk: used or unused */
+	unsigned obj_id;	/* If 0 this is not used */
+	unsigned chunk_id;	/* If 0 this is a header, else a data chunk */
+	unsigned n_bytes;	/* Only valid for data chunks */
+
+	/* The following stuff only has meaning when we read */
+	enum yaffs_ecc_result ecc_result;
+	unsigned block_bad;
+
+	/* YAFFS 1 stuff */
+	unsigned is_deleted;	/* The chunk is marked deleted */
+	unsigned serial_number;	/* Yaffs1 2-bit serial number */
+
+	/* YAFFS2 stuff */
+	unsigned seq_number;	/* The sequence number of this block */
+
+	/* Extra info if this is an object header (YAFFS2 only) */
+
+	unsigned extra_available;	/* Extra info available if not zero */
+	unsigned extra_parent_id;	/* The parent object */
+	unsigned extra_is_shrink;	/* Is it a shrink header? */
+	unsigned extra_shadows;	/* Does this shadow another object? */
+
+	enum yaffs_obj_type extra_obj_type;	/* What object type? */
+
+	loff_t extra_file_size;		/* Length if it is a file */
+	unsigned extra_equiv_id;	/* Equivalent object for a hard link */
+};
+
+/* Spare structure for YAFFS1 */
+struct yaffs_spare {
+	u8 tb0;
+	u8 tb1;
+	u8 tb2;
+	u8 tb3;
+	u8 page_status;		/* set to 0 to delete the chunk */
+	u8 block_status;
+	u8 tb4;
+	u8 tb5;
+	u8 ecc1[3];
+	u8 tb6;
+	u8 tb7;
+	u8 ecc2[3];
+};
+
+/*Special structure for passing through to mtd */
+struct yaffs_nand_spare {
+	struct yaffs_spare spare;
+	int eccres1;
+	int eccres2;
+};
+
+/* Block data in RAM */
+
+enum yaffs_block_state {
+	YAFFS_BLOCK_STATE_UNKNOWN = 0,
+
+	YAFFS_BLOCK_STATE_SCANNING,
+	/* Being scanned */
+
+	YAFFS_BLOCK_STATE_NEEDS_SCAN,
+	/* The block might have something on it (ie it is allocating or full,
+	 * perhaps empty) but it needs to be scanned to determine its true
+	 * state.
+	 * This state is only valid during scanning.
+	 * NB We tolerate empty because the pre-scanner might be incapable of
+	 * deciding
+	 * However, if this state is returned on a YAFFS2 device,
+	 * then we expect a sequence number
+	 */
+
+	YAFFS_BLOCK_STATE_EMPTY,
+	/* This block is empty */
+
+	YAFFS_BLOCK_STATE_ALLOCATING,
+	/* This block is partially allocated.
+	 * At least one page holds valid data.
+	 * This is the one currently being used for page
+	 * allocation. Should never be more than one of these.
+	 * If a block is only partially allocated at mount it is treated as
+	 * full.
+	 */
+
+	YAFFS_BLOCK_STATE_FULL,
+	/* All the pages in this block have been allocated.
+	 * If a block was only partially allocated when mounted we treat
+	 * it as fully allocated.
+	 */
+
+	YAFFS_BLOCK_STATE_DIRTY,
+	/* The block was full and now all chunks have been deleted.
+	 * Erase me, reuse me.
+	 */
+
+	YAFFS_BLOCK_STATE_CHECKPOINT,
+	/* This block is assigned to holding checkpoint data. */
+
+	YAFFS_BLOCK_STATE_COLLECTING,
+	/* This block is being garbage collected */
+
+	YAFFS_BLOCK_STATE_DEAD
+	    /* This block has failed and is not in use */
+};
+
+#define	YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1)
+
+struct yaffs_block_info {
+
+	s32 soft_del_pages:10;	/* number of soft deleted pages */
+	s32 pages_in_use:10;	/* number of pages in use */
+	u32 block_state:4;	/* One of the above block states. */
+				/* NB use unsigned because enum is sometimes
+				 * an int */
+	u32 needs_retiring:1;	/* Data has failed on this block, */
+				/*need to get valid data off and retire*/
+	u32 skip_erased_check:1;/* Skip the erased check on this block */
+	u32 gc_prioritise:1;	/* An ECC check or blank check has failed.
+				   Block should be prioritised for GC */
+	u32 chunk_error_strikes:3;	/* How many times we've had ecc etc
+				failures on this block and tried to reuse it */
+	u32 has_summary:1;	/* The block has a summary */
+
+	u32 has_shrink_hdr:1;	/* This block has at least one shrink header */
+	u32 seq_number;		/* block sequence number for yaffs2 */
+
+};
+
+union yaffs_block_info_union {
+	struct yaffs_block_info bi;
+	u32	as_u32[2];
+};
+
+/* -------------------------- Object structure -------------------------------*/
+/* This is the object structure as stored on NAND */
+
+struct yaffs_obj_hdr {
+	u32 type;  /* enum yaffs_obj_type  */
+
+	/* Apply to everything  */
+	u32 parent_obj_id;
+	u16 sum_no_longer_used;	/* checksum of name. No longer used */
+	YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+
+	/* The following apply to all object types except for hard links */
+	u32 yst_mode;		/* protection */
+
+	u32 yst_uid;
+	u32 yst_gid;
+	u32 yst_atime;
+	u32 yst_mtime;
+	u32 yst_ctime;
+
+	/* File size  applies to files only */
+	u32 file_size_low;
+
+	/* Equivalent object id applies to hard links only. */
+	int equiv_id;
+
+	/* Alias is for symlinks only. */
+	YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1];
+
+	u32 yst_rdev;	/* stuff for block and char devices (major/min) */
+
+	u32 win_ctime[2];
+	u32 win_atime[2];
+	u32 win_mtime[2];
+
+	u32 inband_shadowed_obj_id;
+	u32 inband_is_shrink;
+
+	u32 file_size_high;
+	u32 reserved[1];
+	int shadows_obj;	/* This object header shadows the
+				specified object if > 0 */
+
+	/* is_shrink applies to object headers written when wemake a hole. */
+	u32 is_shrink;
+
+};
+
+/*--------------------------- Tnode -------------------------- */
+
+struct yaffs_tnode {
+	struct yaffs_tnode *internal[YAFFS_NTNODES_INTERNAL];
+};
+
+/*------------------------  Object -----------------------------*/
+/* An object can be one of:
+ * - a directory (no data, has children links
+ * - a regular file (data.... not prunes :->).
+ * - a symlink [symbolic link] (the alias).
+ * - a hard link
+ */
+
+/* The file variant has three file sizes:
+ *  - file_size : size of file as written into Yaffs - including data in cache.
+ *  - stored_size - size of file as stored on media.
+ *  - shrink_size - size of file that has been shrunk back to.
+ *
+ * The stored_size and file_size might be different because the data written
+ * into the cache will increase the file_size but the stored_size will only
+ * change when the data is actually stored.
+ *
+ */
+struct yaffs_file_var {
+	loff_t file_size;
+	loff_t stored_size;
+	loff_t shrink_size;
+	int top_level;
+	struct yaffs_tnode *top;
+};
+
+struct yaffs_dir_var {
+	struct list_head children;	/* list of child links */
+	struct list_head dirty;	/* Entry for list of dirty directories */
+};
+
+struct yaffs_symlink_var {
+	YCHAR *alias;
+};
+
+struct yaffs_hardlink_var {
+	struct yaffs_obj *equiv_obj;
+	u32 equiv_id;
+};
+
+union yaffs_obj_var {
+	struct yaffs_file_var file_variant;
+	struct yaffs_dir_var dir_variant;
+	struct yaffs_symlink_var symlink_variant;
+	struct yaffs_hardlink_var hardlink_variant;
+};
+
+struct yaffs_obj {
+	u8 deleted:1;		/* This should only apply to unlinked files. */
+	u8 soft_del:1;		/* it has also been soft deleted */
+	u8 unlinked:1;		/* An unlinked file.*/
+	u8 fake:1;		/* A fake object has no presence on NAND. */
+	u8 rename_allowed:1;	/* Some objects cannot be renamed. */
+	u8 unlink_allowed:1;
+	u8 dirty:1;		/* the object needs to be written to flash */
+	u8 valid:1;		/* When the file system is being loaded up, this
+				 * object might be created before the data
+				 * is available
+				 * ie. file data chunks encountered before
+				* the header.
+				 */
+	u8 lazy_loaded:1;	/* This object has been lazy loaded and
+				 * is missing some detail */
+
+	u8 defered_free:1;	/* Object is removed from NAND, but is
+				 * still in the inode cache.
+				 * Free of object is defered.
+				 * until the inode is released.
+				 */
+	u8 being_created:1;	/* This object is still being created
+				 * so skip some verification checks. */
+	u8 is_shadowed:1;	/* This object is shadowed on the way
+				 * to being renamed. */
+
+	u8 xattr_known:1;	/* We know if this has object has xattribs
+				 * or not. */
+	u8 has_xattr:1;		/* This object has xattribs.
+				 * Only valid if xattr_known. */
+
+	u8 serial;		/* serial number of chunk in NAND.*/
+	u16 sum;		/* sum of the name to speed searching */
+
+	struct yaffs_dev *my_dev;	/* The device I'm on */
+
+	struct list_head hash_link;	/* list of objects in hash bucket */
+
+	struct list_head hard_links;	/* hard linked object chain*/
+
+	/* directory structure stuff */
+	/* also used for linking up the free list */
+	struct yaffs_obj *parent;
+	struct list_head siblings;
+
+	/* Where's my object header in NAND? */
+	int hdr_chunk;
+
+	int n_data_chunks;	/* Number of data chunks for this file. */
+
+	u32 obj_id;		/* the object id value */
+
+	u32 yst_mode;
+
+	YCHAR short_name[YAFFS_SHORT_NAME_LENGTH + 1];
+
+#ifdef CONFIG_YAFFS_WINCE
+	u32 win_ctime[2];
+	u32 win_mtime[2];
+	u32 win_atime[2];
+#else
+	u32 yst_uid;
+	u32 yst_gid;
+	u32 yst_atime;
+	u32 yst_mtime;
+	u32 yst_ctime;
+#endif
+
+	u32 yst_rdev;
+
+	void *my_inode;
+
+	u32 variant_type; /* enum yaffs_object_type */
+
+	union yaffs_obj_var variant;
+
+};
+
+struct yaffs_obj_bucket {
+	struct list_head list;
+	int count;
+};
+
+
+/*--------------------- Temporary buffers ----------------
+ *
+ * These are chunk-sized working buffers. Each device has a few.
+ */
+
+struct yaffs_buffer {
+	u8 *buffer;
+	int in_use;
+};
+
+/*----------------- Device ---------------------------------*/
+
+struct yaffs_param {
+	const YCHAR *name;
+
+	/*
+	 * Entry parameters set up way early. Yaffs sets up the rest.
+	 * The structure should be zeroed out before use so that unused
+	 * and default values are zero.
+	 */
+
+	int inband_tags;	/* Use unband tags */
+	u32 total_bytes_per_chunk;	/* Should be >= 512, does not need to
+					 be a power of 2 */
+	u32 chunks_per_block;	/* does not need to be a power of 2 */
+	u32 spare_bytes_per_chunk;	/* spare area size */
+	u32 start_block;	/* Start block we're allowed to use */
+	u32 end_block;		/* End block we're allowed to use */
+	u32 n_reserved_blocks;	/* Tuneable so that we can reduce
+				 * reserved blocks on NOR and RAM. */
+
+	u32 n_caches;		/* If == 0, then short op caching is disabled,
+				 * else the number of short op caches.
+				 */
+	int cache_bypass_aligned; /* If non-zero then bypass the cache for
+				   * aligned writes.
+				   */
+
+	int use_nand_ecc;	/* Flag to decide whether or not to use
+				 * NAND driver ECC on data (yaffs1) */
+	int tags_9bytes;	/* Use 9 byte tags */
+	int no_tags_ecc;	/* Flag to decide whether or not to do ECC
+				 * on packed tags (yaffs2) */
+
+	int is_yaffs2;		/* Use yaffs2 mode on this device */
+
+	int empty_lost_n_found;	/* Auto-empty lost+found directory on mount */
+
+	int refresh_period;	/* How often to check for a block refresh */
+
+	/* Checkpoint control. Can be set before or after initialisation */
+	u8 skip_checkpt_rd;
+	u8 skip_checkpt_wr;
+
+	int enable_xattr;	/* Enable xattribs */
+
+	int max_objects;	/*
+				 * Set to limit the number of objects created.
+				 * 0 = no limit.
+				*/
+
+	int hide_lost_n_found;  /* Set non-zero to hide the lost-n-found dir. */
+
+	int stored_endian; /* 0=cpu endian, 1=little endian, 2=big endian */
+
+	/* The remove_obj_fn function must be supplied by OS flavours that
+	 * need it.
+	 * yaffs direct uses it to implement the faster readdir.
+	 * Linux uses it to protect the directory during unlocking.
+	 */
+	void (*remove_obj_fn) (struct yaffs_obj *obj);
+
+	/* Callback to mark the superblock dirty */
+	void (*sb_dirty_fn) (struct yaffs_dev *dev);
+
+	/*  Callback to control garbage collection. */
+	unsigned (*gc_control_fn) (struct yaffs_dev *dev);
+
+	/* Debug control flags. Don't use unless you know what you're doing */
+	int use_header_file_size;	/* Flag to determine if we should use
+					 * file sizes from the header */
+	int disable_lazy_load;	/* Disable lazy loading on this device */
+	int wide_tnodes_disabled;	/* Set to disable wide tnodes */
+	int disable_soft_del;	/* yaffs 1 only: Set to disable the use of
+				 * softdeletion. */
+
+	int defered_dir_update;	/* Set to defer directory updates */
+
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+	int auto_unicode;
+#endif
+	int always_check_erased;	/* Force chunk erased check always on */
+
+	int disable_summary;
+	int disable_bad_block_marking;
+
+};
+
+struct yaffs_driver {
+	int (*drv_write_chunk_fn) (struct yaffs_dev *dev, int nand_chunk,
+				   const u8 *data, int data_len,
+				   const u8 *oob, int oob_len);
+	int (*drv_read_chunk_fn) (struct yaffs_dev *dev, int nand_chunk,
+				   u8 *data, int data_len,
+				   u8 *oob, int oob_len,
+				   enum yaffs_ecc_result *ecc_result);
+	int (*drv_erase_fn) (struct yaffs_dev *dev, int block_no);
+	int (*drv_mark_bad_fn) (struct yaffs_dev *dev, int block_no);
+	int (*drv_check_bad_fn) (struct yaffs_dev *dev, int block_no);
+	int (*drv_initialise_fn) (struct yaffs_dev *dev);
+	int (*drv_deinitialise_fn) (struct yaffs_dev *dev);
+};
+
+struct yaffs_tags_handler {
+	int (*write_chunk_tags_fn) (struct yaffs_dev *dev,
+				    int nand_chunk, const u8 *data,
+				    const struct yaffs_ext_tags *tags);
+	int (*read_chunk_tags_fn) (struct yaffs_dev *dev,
+				   int nand_chunk, u8 *data,
+				   struct yaffs_ext_tags *tags);
+
+	int (*query_block_fn) (struct yaffs_dev *dev, int block_no,
+			       enum yaffs_block_state *state,
+			       u32 *seq_number);
+	int (*mark_bad_fn) (struct yaffs_dev *dev, int block_no);
+};
+
+struct yaffs_dev {
+	struct yaffs_param param;
+	struct yaffs_driver drv;
+	struct yaffs_tags_handler tagger;
+
+	/* Context storage. Holds extra OS specific data for this device */
+
+	void *os_context;
+	void *driver_context;
+
+	struct list_head dev_list;
+
+	int ll_init;
+	/* Runtime parameters. Set up by YAFFS. */
+	u32 data_bytes_per_chunk;
+
+	/* Non-wide tnode stuff */
+	u16 chunk_grp_bits;	/* Number of bits that need to be resolved if
+				 * the tnodes are not wide enough.
+				 */
+	u16 chunk_grp_size;	/* == 2^^chunk_grp_bits */
+
+	struct yaffs_tnode *tn_swap_buffer;
+
+	/* Stuff to support wide tnodes */
+	u32 tnode_width;
+	u32 tnode_mask;
+	u32 tnode_size;
+
+	/* Stuff for figuring out file offset to chunk conversions */
+	u32 chunk_shift;	/* Shift value */
+	u32 chunk_div;		/* Divisor after shifting: 1 for 2^n sizes */
+	u32 chunk_mask;		/* Mask to use for power-of-2 case */
+
+	int is_mounted;
+	int read_only;
+	int is_checkpointed;
+	int swap_endian;	/* Stored endian needs endian swap. */
+
+	/* Stuff to support block offsetting to support start block zero */
+	u32 internal_start_block;
+	u32 internal_end_block;
+	int block_offset;
+	int chunk_offset;
+
+	/* Runtime checkpointing stuff */
+	int checkpt_page_seq;	/* running sequence number of checkpt pages */
+	int checkpt_byte_count;
+	int checkpt_byte_offs;
+	u8 *checkpt_buffer;
+	int checkpt_open_write;
+	u32 blocks_in_checkpt;
+	int checkpt_cur_chunk;
+	int checkpt_cur_block;
+	int checkpt_next_block;
+	int *checkpt_block_list;
+	u32 checkpt_max_blocks;
+	u32 checkpt_sum;
+	u32 checkpt_xor;
+
+	int checkpoint_blocks_required;	/* Number of blocks needed to store
+					 * current checkpoint set */
+
+	/* Block Info */
+	struct yaffs_block_info *block_info;
+	u8 *chunk_bits;		/* bitmap of chunks in use */
+	u8 block_info_alt:1;	/* allocated using alternative alloc */
+	u8 chunk_bits_alt:1;	/* allocated using alternative alloc */
+	int chunk_bit_stride;	/* Number of bytes of chunk_bits per block.
+				 * Must be consistent with chunks_per_block.
+				 */
+
+	int n_erased_blocks;
+	int alloc_block;	/* Current block being allocated off */
+	u32 alloc_page;
+	int alloc_block_finder;	/* Used to search for next allocation block */
+
+	/* Object and Tnode memory management */
+	void *allocator;
+	int n_obj;
+	int n_tnodes;
+
+	int n_hardlinks;
+
+	struct yaffs_obj_bucket obj_bucket[YAFFS_NOBJECT_BUCKETS];
+	u32 bucket_finder;
+
+	int n_free_chunks;
+
+	/* Garbage collection control */
+	u32 *gc_cleanup_list;	/* objects to delete at the end of a GC. */
+	u32 n_clean_ups;
+
+	unsigned has_pending_prioritised_gc;	/* We think this device might
+						have pending prioritised gcs */
+	unsigned gc_disable;
+	unsigned gc_block_finder;
+	unsigned gc_dirtiest;
+	unsigned gc_pages_in_use;
+	unsigned gc_not_done;
+	unsigned gc_block;
+	unsigned gc_chunk;
+	unsigned gc_skip;
+	struct yaffs_summary_tags *gc_sum_tags;
+
+	/* Special directories */
+	struct yaffs_obj *root_dir;
+	struct yaffs_obj *lost_n_found;
+
+	int buffered_block;	/* Which block is buffered here? */
+	int doing_buffered_block_rewrite;
+
+	struct yaffs_cache *cache;
+	int cache_last_use;
+
+	/* Stuff for background deletion and unlinked files. */
+	struct yaffs_obj *unlinked_dir;	/* Directory where unlinked and deleted
+					 files live. */
+	struct yaffs_obj *del_dir;	/* Directory where deleted objects are
+					sent to disappear. */
+	struct yaffs_obj *unlinked_deletion;	/* Current file being
+							background deleted. */
+	int n_deleted_files;	/* Count of files awaiting deletion; */
+	int n_unlinked_files;	/* Count of unlinked files. */
+	int n_bg_deletions;	/* Count of background deletions. */
+
+	/* Temporary buffer management */
+	struct yaffs_buffer temp_buffer[YAFFS_N_TEMP_BUFFERS];
+	int max_temp;
+	int temp_in_use;
+	int unmanaged_buffer_allocs;
+	int unmanaged_buffer_deallocs;
+
+	/* yaffs2 runtime stuff */
+	unsigned seq_number;	/* Sequence number of currently
+					allocating block */
+	unsigned oldest_dirty_seq;
+	unsigned oldest_dirty_block;
+
+	/* Block refreshing */
+	int refresh_skip;	/* A skip down counter.
+				 * Refresh happens when this gets to zero. */
+
+	/* Dirty directory handling */
+	struct list_head dirty_dirs;	/* List of dirty directories */
+
+	/* Summary */
+	int chunks_per_summary;
+	struct yaffs_summary_tags *sum_tags;
+
+	/* Statistics */
+	u32 n_page_writes;
+	u32 n_page_reads;
+	u32 n_erasures;
+	u32 n_bad_queries;
+	u32 n_bad_markings;
+	u32 n_erase_failures;
+	u32 n_gc_copies;
+	u32 all_gcs;
+	u32 passive_gc_count;
+	u32 oldest_dirty_gc_count;
+	u32 n_gc_blocks;
+	u32 bg_gcs;
+	u32 n_retried_writes;
+	u32 n_retired_blocks;
+	u32 n_ecc_fixed;
+	u32 n_ecc_unfixed;
+	u32 n_tags_ecc_fixed;
+	u32 n_tags_ecc_unfixed;
+	u32 n_deletions;
+	u32 n_unmarked_deletions;
+	u32 refresh_count;
+	u32 cache_hits;
+	u32 tags_used;
+	u32 summary_used;
+
+};
+
+/*
+ * Checkpointing definitions.
+ */
+
+#define YAFFS_CHECKPOINT_VERSION	8
+
+/* yaffs_checkpt_obj holds the definition of an object as dumped
+ * by checkpointing.
+ */
+
+
+/*  Checkpint object bits in bitfield: offset, length */
+#define CHECKPOINT_VARIANT_BITS		0, 3
+#define CHECKPOINT_DELETED_BITS		3, 1
+#define CHECKPOINT_SOFT_DEL_BITS	4, 1
+#define CHECKPOINT_UNLINKED_BITS	5, 1
+#define CHECKPOINT_FAKE_BITS		6, 1
+#define CHECKPOINT_RENAME_ALLOWED_BITS	7, 1
+#define CHECKPOINT_UNLINK_ALLOWED_BITS	8, 1
+#define CHECKPOINT_SERIAL_BITS		9, 8
+
+struct yaffs_checkpt_obj {
+	int struct_type;
+	u32 obj_id;
+	u32 parent_id;
+	int hdr_chunk;
+	u32 bit_field;
+	int n_data_chunks;
+	loff_t size_or_equiv_obj;
+};
+
+/* The CheckpointDevice structure holds the device information that changes
+ *at runtime and must be preserved over unmount/mount cycles.
+ */
+struct yaffs_checkpt_dev {
+	int struct_type;
+	int n_erased_blocks;
+	int alloc_block;	/* Current block being allocated off */
+	u32 alloc_page;
+	int n_free_chunks;
+
+	int n_deleted_files;	/* Count of files awaiting deletion; */
+	int n_unlinked_files;	/* Count of unlinked files. */
+	int n_bg_deletions;	/* Count of background deletions. */
+
+	/* yaffs2 runtime stuff */
+	unsigned seq_number;	/* Sequence number of currently
+				 * allocating block */
+
+};
+
+struct yaffs_checkpt_validity {
+	int struct_type;
+	u32 magic;
+	u32 version;
+	u32 head;
+};
+
+struct yaffs_shadow_fixer {
+	int obj_id;
+	int shadowed_id;
+	struct yaffs_shadow_fixer *next;
+};
+
+/* Structure for doing xattr modifications */
+struct yaffs_xattr_mod {
+	int set;		/* If 0 then this is a deletion */
+	const YCHAR *name;
+	const void *data;
+	int size;
+	int flags;
+	int result;
+};
+
+/*----------------------- YAFFS Functions -----------------------*/
+
+int yaffs_guts_initialise(struct yaffs_dev *dev);
+void yaffs_deinitialise(struct yaffs_dev *dev);
+
+int yaffs_get_n_free_chunks(struct yaffs_dev *dev);
+
+int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name,
+		     struct yaffs_obj *new_dir, const YCHAR * new_name);
+
+int yaffs_unlink_obj(struct yaffs_obj *obj);
+
+int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name);
+int yaffs_del_obj(struct yaffs_obj *obj);
+struct yaffs_obj *yaffs_retype_obj(struct yaffs_obj *obj,
+				   enum yaffs_obj_type type);
+
+
+int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size);
+loff_t yaffs_get_obj_length(struct yaffs_obj *obj);
+int yaffs_get_obj_inode(struct yaffs_obj *obj);
+unsigned yaffs_get_obj_type(struct yaffs_obj *obj);
+int yaffs_get_obj_link_count(struct yaffs_obj *obj);
+
+/* File operations */
+int yaffs_file_rd(struct yaffs_obj *obj, u8 * buffer, loff_t offset,
+		  int n_bytes);
+int yaffs_wr_file(struct yaffs_obj *obj, const u8 * buffer, loff_t offset,
+		  int n_bytes, int write_trhrough);
+int yaffs_resize_file(struct yaffs_obj *obj, loff_t new_size);
+
+struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
+				    const YCHAR *name, u32 mode, u32 uid,
+				    u32 gid);
+
+int yaffs_flush_file(struct yaffs_obj *in,
+		     int update_time,
+		     int data_sync,
+		     int discard_cache);
+
+/* Flushing and checkpointing */
+void yaffs_flush_whole_cache(struct yaffs_dev *dev, int discard);
+
+int yaffs_checkpoint_save(struct yaffs_dev *dev);
+int yaffs_checkpoint_restore(struct yaffs_dev *dev);
+
+/* Directory operations */
+struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
+				   u32 mode, u32 uid, u32 gid);
+struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *the_dir,
+				     const YCHAR *name);
+struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number);
+
+/* Link operations */
+struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR *name,
+				 struct yaffs_obj *equiv_obj);
+
+struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj);
+
+/* Symlink operations */
+struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
+				       const YCHAR *name, u32 mode, u32 uid,
+				       u32 gid, const YCHAR *alias);
+YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj);
+
+/* Special inodes (fifos, sockets and devices) */
+struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
+				       const YCHAR *name, u32 mode, u32 uid,
+				       u32 gid, u32 rdev);
+
+int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR *name,
+		      const void *value, int size, int flags);
+int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR *name, void *value,
+		      int size);
+int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size);
+int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR *name);
+
+/* Special directories */
+struct yaffs_obj *yaffs_root(struct yaffs_dev *dev);
+struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev);
+
+void yaffs_handle_defered_free(struct yaffs_obj *obj);
+
+void yaffs_update_dirty_dirs(struct yaffs_dev *dev);
+
+int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency);
+
+/* Debug dump  */
+int yaffs_dump_obj(struct yaffs_obj *obj);
+
+void yaffs_guts_test(struct yaffs_dev *dev);
+int yaffs_guts_ll_init(struct yaffs_dev *dev);
+
+
+/* A few useful functions to be used within the core files*/
+void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
+		     int lyn);
+int yaffs_check_ff(u8 *buffer, int n_bytes);
+void yaffs_handle_chunk_error(struct yaffs_dev *dev,
+			      struct yaffs_block_info *bi);
+
+u8 *yaffs_get_temp_buffer(struct yaffs_dev *dev);
+void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer);
+
+struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
+						 int number,
+						 enum yaffs_obj_type type);
+int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+			    int nand_chunk, int in_scan);
+void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR *name);
+void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
+				const struct yaffs_obj_hdr *oh);
+void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj);
+YCHAR *yaffs_clone_str(const YCHAR *str);
+void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list);
+void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no);
+int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name,
+		    int force, int is_shrink, int shadows,
+		    struct yaffs_xattr_mod *xop);
+void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
+			       int backward_scanning);
+int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks);
+struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev);
+struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
+					   struct yaffs_file_var *file_struct,
+					   u32 chunk_id,
+					   struct yaffs_tnode *passed_tn);
+
+int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
+		     int n_bytes, int write_trhrough);
+void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size);
+void yaffs_skip_rest_of_block(struct yaffs_dev *dev);
+
+int yaffs_count_free_chunks(struct yaffs_dev *dev);
+
+struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
+				       struct yaffs_file_var *file_struct,
+				       u32 chunk_id);
+
+u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
+			 unsigned pos);
+
+int yaffs_is_non_empty_dir(struct yaffs_obj *obj);
+
+int yaffs_guts_format_dev(struct yaffs_dev *dev);
+
+void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
+				int *chunk_out, u32 *offset_out);
+/*
+ * Marshalling functions to get loff_t file sizes into and out of
+ * object headers.
+ */
+void yaffs_oh_size_load(struct yaffs_dev *dev, struct yaffs_obj_hdr *oh,
+			loff_t fsize, int do_endian);
+loff_t yaffs_oh_to_size(struct yaffs_dev *dev, struct yaffs_obj_hdr *oh,
+			int do_endian);
+loff_t yaffs_max_file_size(struct yaffs_dev *dev);
+
+/*
+ * Debug function to count number of blocks in each state
+ * NB Needs to be called with correct number of integers
+ */
+
+void yaffs_count_blocks_by_state(struct yaffs_dev *dev, int bs[10]);
+
+int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
+				    struct yaffs_ext_tags *tags);
+
+/*
+ * Define LOFF_T_32_BIT if a 32-bit LOFF_T is being used.
+ * Not serious if you get this wrong - you might just get some warnings.
+*/
+
+#ifdef  LOFF_T_32_BIT
+#define FSIZE_LOW(fsize) (fsize)
+#define FSIZE_HIGH(fsize) 0
+#define FSIZE_COMBINE(high, low) (low)
+#else
+#define FSIZE_LOW(fsize) ((fsize) & 0xffffffff)
+#define FSIZE_HIGH(fsize)(((fsize) >> 32) & 0xffffffff)
+#define FSIZE_COMBINE(high, low) ((((loff_t) (high)) << 32) | \
+					(((loff_t) (low)) & 0xFFFFFFFF))
+#endif
+
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_linux.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_linux.h
--- linux-4.13.3/fs/yaffs2/yaffs_linux.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_linux.h	2018-01-10 15:09:56.577935391 +0800
@@ -0,0 +1,48 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_LINUX_H__
+#define __YAFFS_LINUX_H__
+
+#include "yportenv.h"
+
+struct yaffs_linux_context {
+	struct list_head context_list;	/* List of these we have mounted */
+	struct yaffs_dev *dev;
+	struct super_block *super;
+	struct task_struct *bg_thread;	/* Background thread for this device */
+	int bg_running;
+	struct mutex gross_lock;	/* Gross locking mutex*/
+	u8 *spare_buffer;	/* For mtdif2 use. Don't know the buffer size
+				 * at compile time so we have to allocate it.
+				 */
+	struct list_head search_contexts;
+	struct task_struct *readdir_process;
+	unsigned mount_id;
+	int dirty;
+};
+
+#define yaffs_dev_to_lc(dev) ((struct yaffs_linux_context *)((dev)->os_context))
+#define yaffs_dev_to_mtd(dev) ((struct mtd_info *)((dev)->driver_context))
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+#define WRITE_SIZE_STR "writesize"
+#define WRITE_SIZE(mtd) ((mtd)->writesize)
+#else
+#define WRITE_SIZE_STR "oobblock"
+#define WRITE_SIZE(mtd) ((mtd)->oobblock)
+#endif
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_mtdif.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_mtdif.c
--- linux-4.13.3/fs/yaffs2/yaffs_mtdif.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_mtdif.c	2018-01-10 15:09:56.537936488 +0800
@@ -0,0 +1,310 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yportenv.h"
+
+#include "yaffs_mtdif.h"
+
+#include "linux/mtd/mtd.h"
+#include "linux/types.h"
+#include "linux/time.h"
+#include "linux/mtd/nand.h"
+#include "linux/kernel.h"
+#include "linux/version.h"
+#include "linux/types.h"
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 14, 0))
+#include "uapi/linux/major.h"
+#endif
+
+#include "yaffs_trace.h"
+#include "yaffs_guts.h"
+#include "yaffs_linux.h"
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0))
+#define MTD_OPS_AUTO_OOB MTD_OOB_AUTO
+#endif
+
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0))
+#define mtd_erase(m, ei) (m)->erase(m, ei)
+#define mtd_write_oob(m, addr, pops) (m)->write_oob(m, addr, pops)
+#define mtd_read_oob(m, addr, pops) (m)->read_oob(m, addr, pops)
+#define mtd_block_isbad(m, offs) (m)->block_isbad(m, offs)
+#define mtd_block_markbad(m, offs) (m)->block_markbad(m, offs)
+#endif
+
+
+
+int nandmtd_erase_block(struct yaffs_dev *dev, int block_no)
+{
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+	u32 addr =
+	    ((loff_t) block_no) * dev->param.total_bytes_per_chunk *
+	    dev->param.chunks_per_block;
+	struct erase_info ei;
+	int retval = 0;
+
+	ei.mtd = mtd;
+	ei.addr = addr;
+	ei.len = dev->param.total_bytes_per_chunk * dev->param.chunks_per_block;
+	ei.time = 1000;
+	ei.retries = 2;
+	ei.callback = NULL;
+	ei.priv = (u_long) dev;
+
+	retval = mtd_erase(mtd, &ei);
+
+	if (retval == 0)
+		return YAFFS_OK;
+
+	return YAFFS_FAIL;
+}
+
+
+static 	int yaffs_mtd_write(struct yaffs_dev *dev, int nand_chunk,
+				   const u8 *data, int data_len,
+				   const u8 *oob, int oob_len)
+{
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+	loff_t addr;
+	struct mtd_oob_ops ops;
+	int retval;
+
+	yaffs_trace(YAFFS_TRACE_MTD,
+			"yaffs_mtd_write(%p, %d, %p, %d, %p, %d)\n",
+			dev, nand_chunk, data, data_len, oob, oob_len);
+
+	if (!data || !data_len) {
+		data = NULL;
+		data_len = 0;
+	}
+
+	if (!oob || !oob_len) {
+		oob = NULL;
+		oob_len = 0;
+	}
+
+	addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
+	memset(&ops, 0, sizeof(ops));
+	ops.mode = MTD_OPS_AUTO_OOB;
+	ops.len = (data) ? data_len : 0;
+	ops.ooblen = oob_len;
+	ops.datbuf = (u8 *)data;
+	ops.oobbuf = (u8 *)oob;
+
+	retval = mtd_write_oob(mtd, addr, &ops);
+	if (retval) {
+		yaffs_trace(YAFFS_TRACE_MTD,
+			"write_oob failed, chunk %d, mtd error %d",
+			nand_chunk, retval);
+	}
+	return retval ? YAFFS_FAIL : YAFFS_OK;
+}
+
+static int yaffs_mtd_read(struct yaffs_dev *dev, int nand_chunk,
+				   u8 *data, int data_len,
+				   u8 *oob, int oob_len,
+				   enum yaffs_ecc_result *ecc_result)
+{
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+	loff_t addr;
+	struct mtd_oob_ops ops;
+	int retval;
+
+	addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
+	memset(&ops, 0, sizeof(ops));
+	ops.mode = MTD_OPS_AUTO_OOB;
+	ops.len = (data) ? data_len : 0;
+	ops.ooblen = oob_len;
+	ops.datbuf = data;
+	ops.oobbuf = oob;
+
+#if (MTD_VERSION_CODE < MTD_VERSION(2, 6, 20))
+	/* In MTD 2.6.18 to 2.6.19 nand_base.c:nand_do_read_oob() has a bug;
+	 * help it out with ops.len = ops.ooblen when ops.datbuf == NULL.
+	 */
+	ops.len = (ops.datbuf) ? ops.len : ops.ooblen;
+#endif
+	/* Read page and oob using MTD.
+	 * Check status and determine ECC result.
+	 */
+	retval = mtd_read_oob(mtd, addr, &ops);
+	if (retval)
+		yaffs_trace(YAFFS_TRACE_MTD,
+			"read_oob failed, chunk %d, mtd error %d",
+			nand_chunk, retval);
+
+	switch (retval) {
+	case 0:
+		/* no error */
+		if(ecc_result)
+			*ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+		break;
+
+	case -EUCLEAN:
+		/* MTD's ECC fixed the data */
+		if(ecc_result)
+			*ecc_result = YAFFS_ECC_RESULT_FIXED;
+		dev->n_ecc_fixed++;
+		break;
+
+	case -EBADMSG:
+	default:
+		/* MTD's ECC could not fix the data */
+		dev->n_ecc_unfixed++;
+		if(ecc_result)
+			*ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+		return YAFFS_FAIL;
+	}
+
+	return YAFFS_OK;
+}
+
+static 	int yaffs_mtd_erase(struct yaffs_dev *dev, int block_no)
+{
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+
+	loff_t addr;
+	struct erase_info ei;
+	int retval = 0;
+	u32 block_size;
+
+	block_size = dev->param.total_bytes_per_chunk *
+		     dev->param.chunks_per_block;
+	addr = ((loff_t) block_no) * block_size;
+
+	ei.mtd = mtd;
+	ei.addr = addr;
+	ei.len = block_size;
+	ei.time = 1000;
+	ei.retries = 2;
+	ei.callback = NULL;
+	ei.priv = (u_long) dev;
+
+	retval = mtd_erase(mtd, &ei);
+
+	if (retval == 0)
+		return YAFFS_OK;
+
+	return YAFFS_FAIL;
+}
+
+static int yaffs_mtd_mark_bad(struct yaffs_dev *dev, int block_no)
+{
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+	int blocksize = dev->param.chunks_per_block * dev->param.total_bytes_per_chunk;
+	int retval;
+
+	yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad", block_no);
+
+	retval = mtd_block_markbad(mtd, (loff_t) blocksize * block_no);
+	return (retval) ? YAFFS_FAIL : YAFFS_OK;
+}
+
+static int yaffs_mtd_check_bad(struct yaffs_dev *dev, int block_no)
+{
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+	int blocksize = dev->param.chunks_per_block * dev->param.total_bytes_per_chunk;
+	int retval;
+
+	yaffs_trace(YAFFS_TRACE_MTD, "checking block %d bad", block_no);
+
+	retval = mtd_block_isbad(mtd, (loff_t) blocksize * block_no);
+	return (retval) ? YAFFS_FAIL : YAFFS_OK;
+}
+
+static int yaffs_mtd_initialise(struct yaffs_dev *dev)
+{
+	return YAFFS_OK;
+}
+
+static int yaffs_mtd_deinitialise(struct yaffs_dev *dev)
+{
+	return YAFFS_OK;
+}
+
+
+void yaffs_mtd_drv_install(struct yaffs_dev *dev)
+{
+	struct yaffs_driver *drv = &dev->drv;
+
+	drv->drv_write_chunk_fn = yaffs_mtd_write;
+	drv->drv_read_chunk_fn = yaffs_mtd_read;
+	drv->drv_erase_fn = yaffs_mtd_erase;
+	drv->drv_mark_bad_fn = yaffs_mtd_mark_bad;
+	drv->drv_check_bad_fn = yaffs_mtd_check_bad;
+	drv->drv_initialise_fn = yaffs_mtd_initialise;
+	drv->drv_deinitialise_fn = yaffs_mtd_deinitialise;
+}
+
+
+struct mtd_info * yaffs_get_mtd_device(dev_t sdev)
+{
+	struct mtd_info *mtd;
+
+	mtd = yaffs_get_mtd_device(sdev);
+
+	/* Check it's an mtd device..... */
+	if (MAJOR(sdev) != MTD_BLOCK_MAJOR)
+		return NULL;	/* This isn't an mtd device */
+
+	/* Check it's NAND */
+	if (mtd->type != MTD_NANDFLASH) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"yaffs: MTD device is not NAND it's type %d",
+			mtd->type);
+		return NULL;
+	}
+
+	yaffs_trace(YAFFS_TRACE_OS, " %s %d", WRITE_SIZE_STR, WRITE_SIZE(mtd));
+	yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
+	yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
+	yaffs_trace(YAFFS_TRACE_OS, " size %u", mtd->size);
+#else
+	yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
+#endif
+
+	return mtd;
+}
+
+int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags)
+{
+	if (yaffs_version == 2) {
+		if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
+		     mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
+		    !inband_tags) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"MTD device does not have the right page sizes"
+			);
+			return -1;
+		}
+	} else {
+		if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
+		    mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"MTD device does not support have the right page sizes"
+			);
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+
+void yaffs_put_mtd_device(struct mtd_info *mtd)
+{
+	if(mtd)
+		put_mtd_device(mtd);
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_mtdif.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_mtdif.h
--- linux-4.13.3/fs/yaffs2/yaffs_mtdif.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_mtdif.h	2018-01-10 15:09:56.577935391 +0800
@@ -0,0 +1,25 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_MTDIF_H__
+#define __YAFFS_MTDIF_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_mtd_drv_install(struct yaffs_dev *dev);
+struct mtd_info * yaffs_get_mtd_device(dev_t sdev);
+void yaffs_put_mtd_device(struct mtd_info *mtd);
+int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags);
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_nameval.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_nameval.c
--- linux-4.13.3/fs/yaffs2/yaffs_nameval.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_nameval.c	2018-01-10 15:09:56.537936488 +0800
@@ -0,0 +1,230 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This simple implementation of a name-value store assumes a small number of
+* values and fits into a small finite buffer.
+ *
+ * Each attribute is stored as a record:
+ *  sizeof(size) bytes   record size.
+ *  strnlen+1 bytes name null terminated.
+ *  nbytes    value.
+ *  ----------
+ *  total size  stored in record size
+ *
+ * This code has not been tested with unicode yet.
+ */
+
+#include "yaffs_nameval.h"
+#include "yaffs_guts.h"
+#include "yportenv.h"
+#include "yaffs_endian.h"
+
+static int nval_find(struct yaffs_dev *dev,
+		     const char *xb, int xb_size, const YCHAR *name,
+		     int *exist_size)
+{
+	int pos = 0;
+	s32 size;
+
+	memcpy(&size, xb, sizeof(size));
+	yaffs_do_endian_s32(dev, &size);
+
+	while (size > 0 && (size < xb_size) && (pos + size < xb_size)) {
+		if (!strncmp((YCHAR *) (xb + pos + sizeof(size)),
+				name, size)) {
+			if (exist_size)
+				*exist_size = size;
+			return pos;
+		}
+		pos += size;
+		if (pos < (int)(xb_size - sizeof(size))) {
+			memcpy(&size, xb + pos, sizeof(size));
+			yaffs_do_endian_s32(dev, &size);
+
+		} else
+			size = 0;
+	}
+	if (exist_size)
+		*exist_size = 0;
+	return -ENODATA;
+}
+
+static int nval_used(struct yaffs_dev *dev, const char *xb, int xb_size)
+{
+	int pos = 0;
+	s32 size;
+
+	memcpy(&size, xb + pos, sizeof(size));
+	yaffs_do_endian_s32(dev, &size);
+
+	while (size > 0 && (size < xb_size) && (pos + size < xb_size)) {
+		pos += size;
+		if (pos < (int)(xb_size - sizeof(size))) {
+			memcpy(&size, xb + pos, sizeof(size));
+			yaffs_do_endian_s32(dev, &size);
+		} else
+			size = 0;
+	}
+	return pos;
+}
+
+int nval_del(struct yaffs_dev *dev, char *xb, int xb_size, const YCHAR *name)
+{
+	int pos = nval_find(dev, xb, xb_size, name, NULL);
+	s32 size;
+
+	if (pos < 0 || pos >= xb_size)
+		return -ENODATA;
+
+	/* Find size, shift rest over this record,
+	 * then zero out the rest of buffer */
+	memcpy(&size, xb + pos, sizeof(size));
+	yaffs_do_endian_s32(dev, &size);
+
+	memcpy(xb + pos, xb + pos + size, xb_size - (pos + size));
+	memset(xb + (xb_size - size), 0, size);
+	return 0;
+}
+
+int nval_set(struct yaffs_dev *dev,
+	     char *xb, int xb_size, const YCHAR *name, const char *buf,
+	     int bsize, int flags)
+{
+	int pos;
+	int namelen = strnlen(name, xb_size);
+	int size_exist = 0;
+	int space;
+	int start;
+	s32 reclen;
+	s32 reclen_endianised;
+
+	pos = nval_find(dev, xb, xb_size, name, &size_exist);
+
+	if (flags & XATTR_CREATE && pos >= 0)
+		return -EEXIST;
+	if (flags & XATTR_REPLACE && pos < 0)
+		return -ENODATA;
+
+	start = nval_used(dev, xb, xb_size);
+	space = xb_size - start + size_exist;
+
+	reclen = (sizeof(reclen) + namelen + 1 + bsize);
+
+	if (reclen > space)
+		return -ENOSPC;
+
+	if (pos >= 0) {
+		/* Exists, so delete it. */
+		nval_del(dev, xb, xb_size, name);
+		start = nval_used(dev, xb, xb_size);
+	}
+
+	pos = start;
+
+	reclen_endianised = reclen;
+	yaffs_do_endian_s32(dev, &reclen_endianised);
+	memcpy(xb + pos, &reclen_endianised, sizeof(reclen_endianised));
+	pos += sizeof(reclen_endianised);
+	strncpy((YCHAR *) (xb + pos), name, reclen);
+	pos += (namelen + 1);
+	memcpy(xb + pos, buf, bsize);
+	return 0;
+}
+
+int nval_get(struct yaffs_dev *dev,
+	     const char *xb, int xb_size, const YCHAR * name, char *buf,
+	     int bsize)
+{
+	int pos = nval_find(dev, xb, xb_size, name, NULL);
+	s32 size;
+
+	if (pos >= 0 && pos < xb_size) {
+
+		memcpy(&size, xb + pos, sizeof(size));
+		yaffs_do_endian_s32(dev, &size);
+		pos += sizeof(size);	/* advance past record length */
+		size -= sizeof(size);
+
+		/* Advance over name string */
+		while (xb[pos] && size > 0 && pos < xb_size) {
+			pos++;
+			size--;
+		}
+		/*Advance over NUL */
+		pos++;
+		size--;
+
+		/* If bsize is zero then this is a size query.
+		 * Return the size, but don't copy.
+		 */
+		if (!bsize)
+			return size;
+
+		if (size <= bsize) {
+			memcpy(buf, xb + pos, size);
+			return size;
+		}
+	}
+	if (pos >= 0)
+		return -ERANGE;
+
+	return -ENODATA;
+}
+
+int nval_list(struct yaffs_dev *dev, const char *xb, int xb_size, char *buf, int bsize)
+{
+	int pos = 0;
+	s32 size;
+	int name_len;
+	int ncopied = 0;
+	int filled = 0;
+
+	memcpy(&size, xb + pos, sizeof(size));
+	yaffs_do_endian_s32(dev, &size);
+
+	while (size > (int)(sizeof(size)) &&
+		size <= xb_size &&
+		(pos + size) < xb_size &&
+		!filled) {
+		pos += sizeof(size);
+		size -= sizeof(size);
+		name_len = strnlen((YCHAR *) (xb + pos), size);
+		if (ncopied + name_len + 1 < bsize) {
+			memcpy(buf, xb + pos, name_len * sizeof(YCHAR));
+			buf += name_len;
+			*buf = '\0';
+			buf++;
+			if (sizeof(YCHAR) > 1) {
+				*buf = '\0';
+				buf++;
+			}
+			ncopied += (name_len + 1);
+		} else {
+			filled = 1;
+		}
+		pos += size;
+		if (pos < (int)(xb_size - sizeof(size))) {
+			memcpy(&size, xb + pos, sizeof(size));
+			yaffs_do_endian_s32(dev, &size);
+		}
+		else
+			size = 0;
+	}
+	return ncopied;
+}
+
+int nval_hasvalues(struct yaffs_dev *dev, const char *xb, int xb_size)
+{
+	return nval_used(dev, xb, xb_size) > 0;
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_nameval.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_nameval.h
--- linux-4.13.3/fs/yaffs2/yaffs_nameval.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_nameval.h	2018-01-10 15:09:56.577935391 +0800
@@ -0,0 +1,33 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __NAMEVAL_H__
+#define __NAMEVAL_H__
+
+#include "yportenv.h"
+
+struct yaffs_dev;
+
+int nval_del(struct yaffs_dev *dev, char *xb, int xb_size, const YCHAR * name);
+int nval_set(struct yaffs_dev *dev,
+	     char *xb, int xb_size, const YCHAR * name, const char *buf,
+	     int bsize, int flags);
+int nval_get(struct yaffs_dev *dev,
+	     const char *xb, int xb_size, const YCHAR * name, char *buf,
+	     int bsize);
+int nval_list(struct yaffs_dev *dev,
+	      const char *xb, int xb_size, char *buf, int bsize);
+int nval_hasvalues(struct yaffs_dev *dev, const char *xb, int xb_size);
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_nand.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_nand.c
--- linux-4.13.3/fs/yaffs2/yaffs_nand.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_nand.c	2018-01-10 15:09:56.537936488 +0800
@@ -0,0 +1,122 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_nand.h"
+#include "yaffs_tagscompat.h"
+
+#include "yaffs_getblockinfo.h"
+#include "yaffs_summary.h"
+
+static int apply_chunk_offset(struct yaffs_dev *dev, int chunk)
+{
+	return chunk - dev->chunk_offset;
+}
+
+int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
+			     u8 *buffer, struct yaffs_ext_tags *tags)
+{
+	int result;
+	struct yaffs_ext_tags local_tags;
+	int flash_chunk = apply_chunk_offset(dev, nand_chunk);
+
+	dev->n_page_reads++;
+
+	/* If there are no tags provided use local tags. */
+	if (!tags)
+		tags = &local_tags;
+
+	result = dev->tagger.read_chunk_tags_fn(dev, flash_chunk, buffer, tags);
+	if (tags && tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) {
+
+		struct yaffs_block_info *bi;
+		bi = yaffs_get_block_info(dev,
+					  nand_chunk /
+					  dev->param.chunks_per_block);
+		yaffs_handle_chunk_error(dev, bi);
+	}
+	return result;
+}
+
+int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
+				int nand_chunk,
+				const u8 *buffer, struct yaffs_ext_tags *tags)
+{
+	int result;
+	int flash_chunk = apply_chunk_offset(dev, nand_chunk);
+
+	dev->n_page_writes++;
+
+	if (!tags) {
+		yaffs_trace(YAFFS_TRACE_ERROR, "Writing with no tags");
+		BUG();
+		return YAFFS_FAIL;
+	}
+
+	tags->seq_number = dev->seq_number;
+	tags->chunk_used = 1;
+	yaffs_trace(YAFFS_TRACE_WRITE,
+		"Writing chunk %d tags %d %d",
+		nand_chunk, tags->obj_id, tags->chunk_id);
+
+	result = dev->tagger.write_chunk_tags_fn(dev, flash_chunk,
+							buffer, tags);
+
+	yaffs_summary_add(dev, tags, nand_chunk);
+
+	return result;
+}
+
+int yaffs_mark_bad(struct yaffs_dev *dev, int block_no)
+{
+	block_no -= dev->block_offset;
+	dev->n_bad_markings++;
+
+	if (dev->param.disable_bad_block_marking)
+		return YAFFS_OK;
+
+	return dev->tagger.mark_bad_fn(dev, block_no);
+}
+
+
+int yaffs_query_init_block_state(struct yaffs_dev *dev,
+				 int block_no,
+				 enum yaffs_block_state *state,
+				 u32 *seq_number)
+{
+	block_no -= dev->block_offset;
+	return dev->tagger.query_block_fn(dev, block_no, state, seq_number);
+}
+
+int yaffs_erase_block(struct yaffs_dev *dev, int block_no)
+{
+	int result;
+
+	block_no -= dev->block_offset;
+	dev->n_erasures++;
+	result = dev->drv.drv_erase_fn(dev, block_no);
+	return result;
+}
+
+int yaffs_init_nand(struct yaffs_dev *dev)
+{
+	if (dev->drv.drv_initialise_fn)
+		return dev->drv.drv_initialise_fn(dev);
+	return YAFFS_OK;
+}
+
+int yaffs_deinit_nand(struct yaffs_dev *dev)
+{
+	if (dev->drv.drv_deinitialise_fn)
+		return dev->drv.drv_deinitialise_fn(dev);
+	return YAFFS_OK;
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_nand.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_nand.h
--- linux-4.13.3/fs/yaffs2/yaffs_nand.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_nand.h	2018-01-10 15:09:56.577935391 +0800
@@ -0,0 +1,39 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_NAND_H__
+#define __YAFFS_NAND_H__
+#include "yaffs_guts.h"
+
+int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
+			     u8 *buffer, struct yaffs_ext_tags *tags);
+
+int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
+			     int nand_chunk,
+			     const u8 *buffer, struct yaffs_ext_tags *tags);
+
+int yaffs_mark_bad(struct yaffs_dev *dev, int block_no);
+
+int yaffs_query_init_block_state(struct yaffs_dev *dev,
+				 int block_no,
+				 enum yaffs_block_state *state,
+				 unsigned *seq_number);
+
+int yaffs_erase_block(struct yaffs_dev *dev, int flash_block);
+
+int yaffs_init_nand(struct yaffs_dev *dev);
+int yaffs_deinit_nand(struct yaffs_dev *dev);
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_packedtags1.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_packedtags1.c
--- linux-4.13.3/fs/yaffs2/yaffs_packedtags1.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_packedtags1.c	2018-01-10 15:09:56.537936488 +0800
@@ -0,0 +1,55 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_packedtags1.h"
+#include "yportenv.h"
+
+static const u8 all_ff[20] = {
+	0xff, 0xff, 0xff, 0xff,
+	0xff, 0xff, 0xff, 0xff,
+	0xff, 0xff, 0xff, 0xff,
+	0xff, 0xff, 0xff, 0xff,
+	0xff, 0xff, 0xff, 0xff
+};
+
+void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt,
+		      const struct yaffs_ext_tags *t)
+{
+	pt->chunk_id = t->chunk_id;
+	pt->serial_number = t->serial_number;
+	pt->n_bytes = t->n_bytes;
+	pt->obj_id = t->obj_id;
+	pt->ecc = 0;
+	pt->deleted = (t->is_deleted) ? 0 : 1;
+	pt->unused_stuff = 0;
+	pt->should_be_ff = 0xffffffff;
+}
+
+void yaffs_unpack_tags1(struct yaffs_ext_tags *t,
+			const struct yaffs_packed_tags1 *pt)
+{
+	if (memcmp(all_ff, pt, sizeof(struct yaffs_packed_tags1))) {
+		t->block_bad = 0;
+		if (pt->should_be_ff != 0xffffffff)
+			t->block_bad = 1;
+		t->chunk_used = 1;
+		t->obj_id = pt->obj_id;
+		t->chunk_id = pt->chunk_id;
+		t->n_bytes = pt->n_bytes;
+		t->ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+		t->is_deleted = (pt->deleted) ? 0 : 1;
+		t->serial_number = pt->serial_number;
+	} else {
+		memset(t, 0, sizeof(struct yaffs_ext_tags));
+	}
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_packedtags1.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_packedtags1.h
--- linux-4.13.3/fs/yaffs2/yaffs_packedtags1.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_packedtags1.h	2018-01-10 15:09:56.577935391 +0800
@@ -0,0 +1,39 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/* This is used to pack YAFFS1 tags, not YAFFS2 tags. */
+
+#ifndef __YAFFS_PACKEDTAGS1_H__
+#define __YAFFS_PACKEDTAGS1_H__
+
+#include "yaffs_guts.h"
+
+struct yaffs_packed_tags1 {
+	u32 chunk_id:20;
+	u32 serial_number:2;
+	u32 n_bytes:10;
+	u32 obj_id:18;
+	u32 ecc:12;
+	u32 deleted:1;
+	u32 unused_stuff:1;
+	unsigned should_be_ff;
+
+};
+
+void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt,
+		      const struct yaffs_ext_tags *t);
+void yaffs_unpack_tags1(struct yaffs_ext_tags *t,
+			const struct yaffs_packed_tags1 *pt);
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_packedtags2.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_packedtags2.c
--- linux-4.13.3/fs/yaffs2/yaffs_packedtags2.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_packedtags2.c	2018-01-10 15:09:56.545936268 +0800
@@ -0,0 +1,208 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_packedtags2.h"
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_endian.h"
+
+/* This code packs a set of extended tags into a binary structure for
+ * NAND storage
+ */
+
+/* Some of the information is "extra" struff which can be packed in to
+ * speed scanning
+ * This is defined by having the EXTRA_HEADER_INFO_FLAG set.
+ */
+
+/* Extra flags applied to chunk_id */
+
+#define EXTRA_HEADER_INFO_FLAG	0x80000000
+#define EXTRA_SHRINK_FLAG	0x40000000
+#define EXTRA_SHADOWS_FLAG	0x20000000
+#define EXTRA_SPARE_FLAGS	0x10000000
+
+#define ALL_EXTRA_FLAGS		0xf0000000
+
+/* Also, the top 4 bits of the object Id are set to the object type. */
+#define EXTRA_OBJECT_TYPE_SHIFT (28)
+#define EXTRA_OBJECT_TYPE_MASK  ((0x0f) << EXTRA_OBJECT_TYPE_SHIFT)
+
+static void yaffs_dump_packed_tags2_tags_only(
+				const struct yaffs_packed_tags2_tags_only *ptt)
+{
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"packed tags obj %d chunk %d byte %d seq %d",
+		ptt->obj_id, ptt->chunk_id, ptt->n_bytes, ptt->seq_number);
+}
+
+static void yaffs_dump_packed_tags2(const struct yaffs_packed_tags2 *pt)
+{
+	yaffs_dump_packed_tags2_tags_only(&pt->t);
+}
+
+static void yaffs_dump_tags2(const struct yaffs_ext_tags *t)
+{
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d",
+		t->ecc_result, t->block_bad, t->chunk_used, t->obj_id,
+		t->chunk_id, t->n_bytes, t->is_deleted, t->serial_number,
+		t->seq_number);
+
+}
+
+static int yaffs_check_tags_extra_packable(const struct yaffs_ext_tags *t)
+{
+	if (t->chunk_id != 0 || !t->extra_available)
+		return 0;
+
+	/* Check if the file size is too long to store */
+	if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE &&
+	    (t->extra_file_size >> 31) != 0)
+		return 0;
+	return 1;
+}
+
+void yaffs_pack_tags2_tags_only(struct yaffs_dev *dev,
+				struct yaffs_packed_tags2_tags_only *ptt,
+				const struct yaffs_ext_tags *t)
+{
+	ptt->chunk_id = t->chunk_id;
+	ptt->seq_number = t->seq_number;
+	ptt->n_bytes = t->n_bytes;
+	ptt->obj_id = t->obj_id;
+
+	/* Only store extra tags for object headers.
+	 * If it is a file then only store  if the file size is short\
+	 * enough to fit.
+	 */
+	if (yaffs_check_tags_extra_packable(t)) {
+		/* Store the extra header info instead */
+		/* We save the parent object in the chunk_id */
+		ptt->chunk_id = EXTRA_HEADER_INFO_FLAG | t->extra_parent_id;
+		if (t->extra_is_shrink)
+			ptt->chunk_id |= EXTRA_SHRINK_FLAG;
+		if (t->extra_shadows)
+			ptt->chunk_id |= EXTRA_SHADOWS_FLAG;
+
+		ptt->obj_id &= ~EXTRA_OBJECT_TYPE_MASK;
+		ptt->obj_id |= (t->extra_obj_type << EXTRA_OBJECT_TYPE_SHIFT);
+
+		if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK)
+			ptt->n_bytes = t->extra_equiv_id;
+		else if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE)
+			ptt->n_bytes = (unsigned) t->extra_file_size;
+		else
+			ptt->n_bytes = 0;
+	}
+
+	yaffs_dump_packed_tags2_tags_only(ptt);
+	yaffs_dump_tags2(t);
+	yaffs_do_endian_packed_tags2(dev, ptt);
+}
+
+void yaffs_pack_tags2(struct yaffs_dev *dev,
+		      struct yaffs_packed_tags2 *pt,
+		      const struct yaffs_ext_tags *t, int tags_ecc)
+{
+	yaffs_pack_tags2_tags_only(dev, &pt->t, t);
+
+	if (tags_ecc)
+		yaffs_ecc_calc_other((unsigned char *)&pt->t,
+				    sizeof(struct yaffs_packed_tags2_tags_only),
+				    &pt->ecc);
+}
+
+void yaffs_unpack_tags2_tags_only(struct yaffs_dev *dev,
+				  struct yaffs_ext_tags *t,
+				  struct yaffs_packed_tags2_tags_only *ptt_ptr)
+{
+	struct yaffs_packed_tags2_tags_only ptt_copy = *ptt_ptr;
+
+	memset(t, 0, sizeof(struct yaffs_ext_tags));
+
+	if (ptt_copy.seq_number == 0xffffffff)
+		return;
+
+	yaffs_do_endian_packed_tags2(dev, &ptt_copy);
+
+	t->block_bad = 0;
+	t->chunk_used = 1;
+	t->obj_id = ptt_copy.obj_id;
+	t->chunk_id = ptt_copy.chunk_id;
+	t->n_bytes = ptt_copy.n_bytes;
+	t->is_deleted = 0;
+	t->serial_number = 0;
+	t->seq_number = ptt_copy.seq_number;
+
+	/* Do extra header info stuff */
+	if (ptt_copy.chunk_id & EXTRA_HEADER_INFO_FLAG) {
+		t->chunk_id = 0;
+		t->n_bytes = 0;
+
+		t->extra_available = 1;
+		t->extra_parent_id = ptt_copy.chunk_id & (~(ALL_EXTRA_FLAGS));
+		t->extra_is_shrink = ptt_copy.chunk_id & EXTRA_SHRINK_FLAG ? 1 : 0;
+		t->extra_shadows = ptt_copy.chunk_id & EXTRA_SHADOWS_FLAG ? 1 : 0;
+		t->extra_obj_type = ptt_copy.obj_id >> EXTRA_OBJECT_TYPE_SHIFT;
+		t->obj_id &= ~EXTRA_OBJECT_TYPE_MASK;
+
+		if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK)
+			t->extra_equiv_id = ptt_copy.n_bytes;
+		else
+			t->extra_file_size = ptt_copy.n_bytes;
+	}
+	yaffs_dump_packed_tags2_tags_only(ptt_ptr);
+	yaffs_dump_tags2(t);
+}
+
+void yaffs_unpack_tags2(struct yaffs_dev *dev,
+			struct yaffs_ext_tags *t,
+			struct yaffs_packed_tags2 *pt,
+			int tags_ecc)
+{
+	enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+
+	if (pt->t.seq_number != 0xffffffff && tags_ecc) {
+		/* Chunk is in use and we need to do ECC */
+
+		struct yaffs_ecc_other ecc;
+		int result;
+		yaffs_ecc_calc_other((unsigned char *)&pt->t,
+				sizeof(struct yaffs_packed_tags2_tags_only),
+				&ecc);
+		result =
+		    yaffs_ecc_correct_other((unsigned char *)&pt->t,
+				sizeof(struct yaffs_packed_tags2_tags_only),
+				&pt->ecc, &ecc);
+		switch (result) {
+		case 0:
+			ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+			break;
+		case 1:
+			ecc_result = YAFFS_ECC_RESULT_FIXED;
+			break;
+		case -1:
+			ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+			break;
+		default:
+			ecc_result = YAFFS_ECC_RESULT_UNKNOWN;
+		}
+	}
+	yaffs_unpack_tags2_tags_only(dev, t, &pt->t);
+
+	t->ecc_result = ecc_result;
+
+	yaffs_dump_packed_tags2(pt);
+	yaffs_dump_tags2(t);
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_packedtags2.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_packedtags2.h
--- linux-4.13.3/fs/yaffs2/yaffs_packedtags2.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_packedtags2.h	2018-01-10 15:09:56.577935391 +0800
@@ -0,0 +1,51 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/* This is used to pack YAFFS2 tags, not YAFFS1tags. */
+
+#ifndef __YAFFS_PACKEDTAGS2_H__
+#define __YAFFS_PACKEDTAGS2_H__
+
+#include "yaffs_guts.h"
+#include "yaffs_ecc.h"
+
+struct yaffs_packed_tags2_tags_only {
+	unsigned seq_number;
+	unsigned obj_id;
+	unsigned chunk_id;
+	unsigned n_bytes;
+};
+
+struct yaffs_packed_tags2 {
+	struct yaffs_packed_tags2_tags_only t;
+	struct yaffs_ecc_other ecc;
+};
+
+/* Full packed tags with ECC, used for oob tags */
+void yaffs_pack_tags2(struct yaffs_dev *dev,
+		      struct yaffs_packed_tags2 *pt,
+		      const struct yaffs_ext_tags *t, int tags_ecc);
+void yaffs_unpack_tags2(struct yaffs_dev *dev,
+			struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt,
+			int tags_ecc);
+
+/* Only the tags part (no ECC for use with inband tags */
+void yaffs_pack_tags2_tags_only(struct yaffs_dev *dev,
+				struct yaffs_packed_tags2_tags_only *pt,
+				const struct yaffs_ext_tags *t);
+void yaffs_unpack_tags2_tags_only(struct yaffs_dev *dev,
+				  struct yaffs_ext_tags *t,
+				  struct yaffs_packed_tags2_tags_only *pt);
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_summary.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_summary.c
--- linux-4.13.3/fs/yaffs2/yaffs_summary.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_summary.c	2018-01-10 15:09:56.545936268 +0800
@@ -0,0 +1,310 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/* Summaries write the useful part of the tags for the chunks in a block into an
+ * an array which is written to the last n chunks of the block.
+ * Reading the summaries gives all the tags for the block in one read. Much
+ * faster.
+ *
+ * Chunks holding summaries are marked with tags making it look like
+ * they are part of a fake file.
+ *
+ * The summary could also be used during gc.
+ *
+ */
+
+#include "yaffs_summary.h"
+#include "yaffs_packedtags2.h"
+#include "yaffs_nand.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_bitmap.h"
+
+/*
+ * The summary is built up in an array of summary tags.
+ * This gets written to the last one or two (maybe more) chunks in a block.
+ * A summary header is written as the first part of each chunk of summary data.
+ * The summary header must match or the summary is rejected.
+ */
+
+/* Summary tags don't need the sequence number because that is redundant. */
+struct yaffs_summary_tags {
+	unsigned obj_id;
+	unsigned chunk_id;
+	unsigned n_bytes;
+};
+
+/* Summary header */
+struct yaffs_summary_header {
+	unsigned version;	/* Must match current version */
+	unsigned block;		/* Must be this block */
+	unsigned seq;		/* Must be this sequence number */
+	unsigned sum;		/* Just add up all the bytes in the tags */
+};
+
+
+static void yaffs_summary_clear(struct yaffs_dev *dev)
+{
+	if (!dev->sum_tags)
+		return;
+	memset(dev->sum_tags, 0, dev->chunks_per_summary *
+		sizeof(struct yaffs_summary_tags));
+}
+
+
+void yaffs_summary_deinit(struct yaffs_dev *dev)
+{
+	kfree(dev->sum_tags);
+	dev->sum_tags = NULL;
+	kfree(dev->gc_sum_tags);
+	dev->gc_sum_tags = NULL;
+	dev->chunks_per_summary = 0;
+}
+
+int yaffs_summary_init(struct yaffs_dev *dev)
+{
+	int sum_bytes;
+	int chunks_used; /* Number of chunks used by summary */
+	int sum_tags_bytes;
+
+	sum_bytes = dev->param.chunks_per_block *
+			sizeof(struct yaffs_summary_tags);
+
+	chunks_used = (sum_bytes + dev->data_bytes_per_chunk - 1)/
+			(dev->data_bytes_per_chunk -
+				sizeof(struct yaffs_summary_header));
+
+	dev->chunks_per_summary = dev->param.chunks_per_block - chunks_used;
+	sum_tags_bytes = sizeof(struct yaffs_summary_tags) *
+				dev->chunks_per_summary;
+	dev->sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS);
+	dev->gc_sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS);
+	if (!dev->sum_tags || !dev->gc_sum_tags) {
+		yaffs_summary_deinit(dev);
+		return YAFFS_FAIL;
+	}
+
+	yaffs_summary_clear(dev);
+
+	return YAFFS_OK;
+}
+
+static unsigned yaffs_summary_sum(struct yaffs_dev *dev)
+{
+	u8 *sum_buffer = (u8 *)dev->sum_tags;
+	int i;
+	unsigned sum = 0;
+
+	i = sizeof(struct yaffs_summary_tags) *
+				dev->chunks_per_summary;
+	while (i > 0) {
+		sum += *sum_buffer;
+		sum_buffer++;
+		i--;
+	}
+
+	return sum;
+}
+
+static int yaffs_summary_write(struct yaffs_dev *dev, int blk)
+{
+	struct yaffs_ext_tags tags;
+	u8 *buffer;
+	u8 *sum_buffer = (u8 *)dev->sum_tags;
+	int n_bytes;
+	int chunk_in_nand;
+	int chunk_in_block;
+	int result;
+	int this_tx;
+	struct yaffs_summary_header hdr;
+	int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr);
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
+
+	buffer = yaffs_get_temp_buffer(dev);
+	n_bytes = sizeof(struct yaffs_summary_tags) *
+				dev->chunks_per_summary;
+	memset(&tags, 0, sizeof(struct yaffs_ext_tags));
+	tags.obj_id = YAFFS_OBJECTID_SUMMARY;
+	tags.chunk_id = 1;
+	chunk_in_block = dev->chunks_per_summary;
+	chunk_in_nand = dev->alloc_block * dev->param.chunks_per_block +
+						dev->chunks_per_summary;
+	hdr.version = YAFFS_SUMMARY_VERSION;
+	hdr.block = blk;
+	hdr.seq = bi->seq_number;
+	hdr.sum = yaffs_summary_sum(dev);
+
+	do {
+		this_tx = n_bytes;
+		if (this_tx > sum_bytes_per_chunk)
+			this_tx = sum_bytes_per_chunk;
+		memcpy(buffer, &hdr, sizeof(hdr));
+		memcpy(buffer + sizeof(hdr), sum_buffer, this_tx);
+		tags.n_bytes = this_tx + sizeof(hdr);
+		result = yaffs_wr_chunk_tags_nand(dev, chunk_in_nand,
+						buffer, &tags);
+
+		if (result != YAFFS_OK)
+			break;
+		yaffs_set_chunk_bit(dev, blk, chunk_in_block);
+		bi->pages_in_use++;
+		dev->n_free_chunks--;
+
+		n_bytes -= this_tx;
+		sum_buffer += this_tx;
+		chunk_in_nand++;
+		chunk_in_block++;
+		tags.chunk_id++;
+	} while (result == YAFFS_OK && n_bytes > 0);
+	yaffs_release_temp_buffer(dev, buffer);
+
+
+	if (result == YAFFS_OK)
+		bi->has_summary = 1;
+
+
+	return result;
+}
+
+int yaffs_summary_read(struct yaffs_dev *dev,
+			struct yaffs_summary_tags *st,
+			int blk)
+{
+	struct yaffs_ext_tags tags;
+	u8 *buffer;
+	u8 *sum_buffer = (u8 *)st;
+	int n_bytes;
+	u32 chunk_id;
+	int chunk_in_nand;
+	int chunk_in_block;
+	int result;
+	int this_tx;
+	struct yaffs_summary_header hdr;
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
+	int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr);
+
+	buffer = yaffs_get_temp_buffer(dev);
+	n_bytes = sizeof(struct yaffs_summary_tags) * dev->chunks_per_summary;
+	chunk_in_block = dev->chunks_per_summary;
+	chunk_in_nand = blk * dev->param.chunks_per_block +
+							dev->chunks_per_summary;
+	chunk_id = 1;
+	do {
+		this_tx = n_bytes;
+		if (this_tx > sum_bytes_per_chunk)
+			this_tx = sum_bytes_per_chunk;
+		result = yaffs_rd_chunk_tags_nand(dev, chunk_in_nand,
+						buffer, &tags);
+
+		if (tags.chunk_id != chunk_id ||
+			tags.obj_id != YAFFS_OBJECTID_SUMMARY ||
+			tags.chunk_used == 0 ||
+			tags.ecc_result > YAFFS_ECC_RESULT_FIXED ||
+			tags.n_bytes != (this_tx + sizeof(hdr)))
+				result = YAFFS_FAIL;
+		if (result != YAFFS_OK)
+			break;
+
+		if (st == dev->sum_tags) {
+			/* If we're scanning then update the block info */
+			yaffs_set_chunk_bit(dev, blk, chunk_in_block);
+			bi->pages_in_use++;
+		}
+		memcpy(&hdr, buffer, sizeof(hdr));
+		memcpy(sum_buffer, buffer + sizeof(hdr), this_tx);
+		n_bytes -= this_tx;
+		sum_buffer += this_tx;
+		chunk_in_nand++;
+		chunk_in_block++;
+		chunk_id++;
+	} while (result == YAFFS_OK && n_bytes > 0);
+	yaffs_release_temp_buffer(dev, buffer);
+
+	if (result == YAFFS_OK) {
+		/* Verify header */
+		if (hdr.version != YAFFS_SUMMARY_VERSION ||
+		    hdr.seq != bi->seq_number ||
+		    hdr.sum != yaffs_summary_sum(dev))
+			result = YAFFS_FAIL;
+	}
+
+	if (st == dev->sum_tags && result == YAFFS_OK)
+		bi->has_summary = 1;
+
+	return result;
+}
+
+int yaffs_summary_add(struct yaffs_dev *dev,
+			struct yaffs_ext_tags *tags,
+			int chunk_in_nand)
+{
+	struct yaffs_packed_tags2_tags_only tags_only;
+	struct yaffs_summary_tags *sum_tags;
+	int block_in_nand = chunk_in_nand / dev->param.chunks_per_block;
+	int chunk_in_block = chunk_in_nand % dev->param.chunks_per_block;
+
+	if (!dev->sum_tags)
+		return YAFFS_OK;
+
+	if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) {
+		yaffs_pack_tags2_tags_only(dev, &tags_only, tags);
+		sum_tags = &dev->sum_tags[chunk_in_block];
+
+		sum_tags->chunk_id = tags_only.chunk_id;
+		sum_tags->n_bytes = tags_only.n_bytes;
+		sum_tags->obj_id = tags_only.obj_id;
+
+		if (chunk_in_block == dev->chunks_per_summary - 1) {
+			/* Time to write out the summary */
+			yaffs_summary_write(dev, block_in_nand);
+			yaffs_summary_clear(dev);
+			yaffs_skip_rest_of_block(dev);
+		}
+	}
+	return YAFFS_OK;
+}
+
+int yaffs_summary_fetch(struct yaffs_dev *dev,
+			struct yaffs_ext_tags *tags,
+			int chunk_in_block)
+{
+	struct yaffs_packed_tags2_tags_only tags_only;
+	struct yaffs_summary_tags *sum_tags;
+	if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) {
+		sum_tags = &dev->sum_tags[chunk_in_block];
+		tags_only.chunk_id = sum_tags->chunk_id;
+		tags_only.n_bytes = sum_tags->n_bytes;
+		tags_only.obj_id = sum_tags->obj_id;
+		yaffs_unpack_tags2_tags_only(dev, tags, &tags_only);
+		return YAFFS_OK;
+	}
+	return YAFFS_FAIL;
+}
+
+void yaffs_summary_gc(struct yaffs_dev *dev, int blk)
+{
+	struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
+	u32 i;
+
+	if (!bi->has_summary)
+		return;
+
+	for (i = dev->chunks_per_summary;
+	     i < dev->param.chunks_per_block;
+	     i++) {
+		if (yaffs_check_chunk_bit(dev, blk, i)) {
+			yaffs_clear_chunk_bit(dev, blk, i);
+			bi->pages_in_use--;
+			dev->n_free_chunks++;
+		}
+	}
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_summary.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_summary.h
--- linux-4.13.3/fs/yaffs2/yaffs_summary.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_summary.h	2018-01-10 15:09:56.577935391 +0800
@@ -0,0 +1,37 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_SUMMARY_H__
+#define __YAFFS_SUMMARY_H__
+
+#include "yaffs_packedtags2.h"
+
+
+int yaffs_summary_init(struct yaffs_dev *dev);
+void yaffs_summary_deinit(struct yaffs_dev *dev);
+
+int yaffs_summary_add(struct yaffs_dev *dev,
+			struct yaffs_ext_tags *tags,
+			int chunk_in_block);
+int yaffs_summary_fetch(struct yaffs_dev *dev,
+			struct yaffs_ext_tags *tags,
+			int chunk_in_block);
+int yaffs_summary_read(struct yaffs_dev *dev,
+			struct yaffs_summary_tags *st,
+			int blk);
+void yaffs_summary_gc(struct yaffs_dev *dev, int blk);
+
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_tagscompat.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_tagscompat.c
--- linux-4.13.3/fs/yaffs2/yaffs_tagscompat.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_tagscompat.c	2018-01-10 15:09:56.549936158 +0800
@@ -0,0 +1,400 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This file handles yaffs1-style tags to allow compatibility with Yaffs1 style
+ * flash layouts.
+ */
+
+#include "yaffs_guts.h"
+#include "yaffs_tagscompat.h"
+#include "yaffs_ecc.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_trace.h"
+#include "yaffs_endian.h"
+
+static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk);
+
+
+/********** Tags ECC calculations  *********/
+
+void yaffs_calc_tags_ecc(struct yaffs_tags *tags)
+{
+	/* Calculate an ecc */
+	unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes;
+	unsigned i, j;
+	unsigned ecc = 0;
+	unsigned bit = 0;
+
+	tags->ecc = 0;
+
+	for (i = 0; i < 8; i++) {
+		for (j = 1; j & 0xff; j <<= 1) {
+			bit++;
+			if (b[i] & j)
+				ecc ^= bit;
+		}
+	}
+	tags->ecc = ecc;
+}
+
+int yaffs_check_tags_ecc(struct yaffs_tags *tags)
+{
+	unsigned ecc = tags->ecc;
+
+	yaffs_calc_tags_ecc(tags);
+
+	ecc ^= tags->ecc;
+
+	if (ecc && ecc <= 64) {
+		/* TODO: Handle the failure better. Retire? */
+		unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes;
+
+		ecc--;
+
+		b[ecc / 8] ^= (1 << (ecc & 7));
+
+		/* Now recvalc the ecc */
+		yaffs_calc_tags_ecc(tags);
+
+		return 1;	/* recovered error */
+	} else if (ecc) {
+		/* Wierd ecc failure value */
+		/* TODO Need to do somethiong here */
+		return -1;	/* unrecovered error */
+	}
+	return 0;
+}
+
+/********** Tags **********/
+
+/*
+ * During tags storing/retireval we use a copy of the tags so that
+ * we can modify the endian etc without damaging the previous structure.
+ */
+static void yaffs_load_tags_to_spare(struct yaffs_dev *dev,
+				     struct yaffs_spare *spare_ptr,
+				     struct yaffs_tags *tags_ptr)
+{
+	union yaffs_tags_union *tu_ptr = (union yaffs_tags_union *)tags_ptr;
+	union yaffs_tags_union tags_stored = *tu_ptr;
+
+	yaffs_calc_tags_ecc(&tags_stored.as_tags);
+
+	yaffs_do_endian_u32(dev, &tags_stored.as_u32[0]);
+	yaffs_do_endian_u32(dev, &tags_stored.as_u32[1]);
+
+	spare_ptr->tb0 = tags_stored.as_bytes[0];
+	spare_ptr->tb1 = tags_stored.as_bytes[1];
+	spare_ptr->tb2 = tags_stored.as_bytes[2];
+	spare_ptr->tb3 = tags_stored.as_bytes[3];
+	spare_ptr->tb4 = tags_stored.as_bytes[4];
+	spare_ptr->tb5 = tags_stored.as_bytes[5];
+	spare_ptr->tb6 = tags_stored.as_bytes[6];
+	spare_ptr->tb7 = tags_stored.as_bytes[7];
+}
+
+static void yaffs_get_tags_from_spare(struct yaffs_dev *dev,
+				      struct yaffs_spare *spare_ptr,
+				      struct yaffs_tags *tags_ptr)
+{
+	union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr;
+	union yaffs_tags_union tags_stored;
+	int result;
+
+	tags_stored.as_bytes[0] = spare_ptr->tb0;
+	tags_stored.as_bytes[1] = spare_ptr->tb1;
+	tags_stored.as_bytes[2] = spare_ptr->tb2;
+	tags_stored.as_bytes[3] = spare_ptr->tb3;
+	tags_stored.as_bytes[4] = spare_ptr->tb4;
+	tags_stored.as_bytes[5] = spare_ptr->tb5;
+	tags_stored.as_bytes[6] = spare_ptr->tb6;
+	tags_stored.as_bytes[7] = spare_ptr->tb7;
+
+	yaffs_do_endian_u32(dev, &tags_stored.as_u32[0]);
+	yaffs_do_endian_u32(dev, &tags_stored.as_u32[1]);
+
+	*tu = tags_stored;
+
+	result = yaffs_check_tags_ecc(tags_ptr);
+	if (result > 0)
+		dev->n_tags_ecc_fixed++;
+	else if (result < 0)
+		dev->n_tags_ecc_unfixed++;
+}
+
+static void yaffs_spare_init(struct yaffs_spare *spare)
+{
+	memset(spare, 0xff, sizeof(struct yaffs_spare));
+}
+
+static int yaffs_wr_nand(struct yaffs_dev *dev,
+			 int nand_chunk, const u8 *data,
+			 struct yaffs_spare *spare)
+{
+	int data_size = dev->data_bytes_per_chunk;
+
+	return dev->drv.drv_write_chunk_fn(dev, nand_chunk,
+				data, data_size,
+				(u8 *) spare, sizeof(*spare));
+}
+
+static int yaffs_rd_chunk_nand(struct yaffs_dev *dev,
+			       int nand_chunk,
+			       u8 *data,
+			       struct yaffs_spare *spare,
+			       enum yaffs_ecc_result *ecc_result,
+			       int correct_errors)
+{
+	int ret_val;
+	struct yaffs_spare local_spare;
+	int data_size;
+	int spare_size;
+	int ecc_result1, ecc_result2;
+	u8 calc_ecc[3];
+
+	if (!spare) {
+		/* If we don't have a real spare, then we use a local one. */
+		/* Need this for the calculation of the ecc */
+		spare = &local_spare;
+	}
+	data_size = dev->data_bytes_per_chunk;
+	spare_size = sizeof(struct yaffs_spare);
+
+	if (dev->param.use_nand_ecc)
+		return dev->drv.drv_read_chunk_fn(dev, nand_chunk,
+						data, data_size,
+						(u8 *) spare, spare_size,
+						ecc_result);
+
+
+	/* Handle the ECC at this level. */
+
+	ret_val = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
+						 data, data_size,
+						 (u8 *)spare, spare_size,
+						NULL);
+	if (!data || !correct_errors)
+		return ret_val;
+
+	/* Do ECC correction if needed. */
+	yaffs_ecc_calc(data, calc_ecc);
+	ecc_result1 = yaffs_ecc_correct(data, spare->ecc1, calc_ecc);
+	yaffs_ecc_calc(&data[256], calc_ecc);
+	ecc_result2 = yaffs_ecc_correct(&data[256], spare->ecc2, calc_ecc);
+
+	if (ecc_result1 > 0) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"**>>yaffs ecc error fix performed on chunk %d:0",
+			nand_chunk);
+		dev->n_ecc_fixed++;
+	} else if (ecc_result1 < 0) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"**>>yaffs ecc error unfixed on chunk %d:0",
+			nand_chunk);
+		dev->n_ecc_unfixed++;
+	}
+
+	if (ecc_result2 > 0) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"**>>yaffs ecc error fix performed on chunk %d:1",
+			nand_chunk);
+		dev->n_ecc_fixed++;
+	} else if (ecc_result2 < 0) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"**>>yaffs ecc error unfixed on chunk %d:1",
+			nand_chunk);
+		dev->n_ecc_unfixed++;
+	}
+
+	if (ecc_result1 || ecc_result2) {
+		/* We had a data problem on this page */
+		yaffs_handle_rd_data_error(dev, nand_chunk);
+	}
+
+	if (ecc_result1 < 0 || ecc_result2 < 0)
+		*ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+	else if (ecc_result1 > 0 || ecc_result2 > 0)
+		*ecc_result = YAFFS_ECC_RESULT_FIXED;
+	else
+		*ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
+
+	return ret_val;
+}
+
+/*
+ * Functions for robustisizing
+ */
+
+static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk)
+{
+	int flash_block = nand_chunk / dev->param.chunks_per_block;
+
+	/* Mark the block for retirement */
+	yaffs_get_block_info(dev, flash_block + dev->block_offset)->
+		needs_retiring = 1;
+	yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+		"**>>Block %d marked for retirement",
+		flash_block);
+
+	/* TODO:
+	 * Just do a garbage collection on the affected block
+	 * then retire the block
+	 * NB recursion
+	 */
+}
+
+static int yaffs_tags_compat_wr(struct yaffs_dev *dev,
+			 int nand_chunk,
+			 const u8 *data, const struct yaffs_ext_tags *ext_tags)
+{
+	struct yaffs_spare spare;
+	struct yaffs_tags tags;
+
+	yaffs_spare_init(&spare);
+
+	if (ext_tags->is_deleted)
+		spare.page_status = 0;
+	else {
+		tags.obj_id = ext_tags->obj_id;
+		tags.chunk_id = ext_tags->chunk_id;
+
+		tags.n_bytes_lsb = ext_tags->n_bytes & (1024 - 1);
+
+		if (dev->data_bytes_per_chunk >= 1024)
+			tags.n_bytes_msb = (ext_tags->n_bytes >> 10) & 3;
+		else
+			tags.n_bytes_msb = 3;
+
+		tags.serial_number = ext_tags->serial_number;
+
+		if (!dev->param.use_nand_ecc && data) {
+			yaffs_ecc_calc(data, spare.ecc1);
+			yaffs_ecc_calc(&data[256], spare.ecc2);
+		}
+
+		yaffs_load_tags_to_spare(dev, &spare, &tags);
+	}
+	return yaffs_wr_nand(dev, nand_chunk, data, &spare);
+}
+
+static int yaffs_tags_compat_rd(struct yaffs_dev *dev,
+			 int nand_chunk,
+			 u8 *data, struct yaffs_ext_tags *ext_tags)
+{
+	struct yaffs_spare spare;
+	struct yaffs_tags tags;
+	enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_UNKNOWN;
+	static struct yaffs_spare spare_ff;
+	static int init;
+	int deleted;
+
+	if (!init) {
+		memset(&spare_ff, 0xff, sizeof(spare_ff));
+		init = 1;
+	}
+
+	if (!yaffs_rd_chunk_nand(dev, nand_chunk,
+					data, &spare, &ecc_result, 1))
+		return YAFFS_FAIL;
+
+	/* ext_tags may be NULL */
+	if (!ext_tags)
+		return YAFFS_OK;
+
+	deleted = (hweight8(spare.page_status) < 7) ? 1 : 0;
+
+	ext_tags->is_deleted = deleted;
+	ext_tags->ecc_result = ecc_result;
+	ext_tags->block_bad = 0;	/* We're reading it */
+	/* therefore it is not a bad block */
+	ext_tags->chunk_used =
+		memcmp(&spare_ff, &spare, sizeof(spare_ff)) ? 1 : 0;
+
+	if (ext_tags->chunk_used) {
+		yaffs_get_tags_from_spare(dev, &spare, &tags);
+
+		ext_tags->obj_id = tags.obj_id;
+		ext_tags->chunk_id = tags.chunk_id;
+		ext_tags->n_bytes = tags.n_bytes_lsb;
+
+		if (dev->data_bytes_per_chunk >= 1024)
+			ext_tags->n_bytes |=
+				(((unsigned)tags.n_bytes_msb) << 10);
+
+		ext_tags->serial_number = tags.serial_number;
+	}
+
+	return YAFFS_OK;
+}
+
+static int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int flash_block)
+{
+	struct yaffs_spare spare;
+
+	memset(&spare, 0xff, sizeof(struct yaffs_spare));
+
+	spare.block_status = 'Y';
+
+	yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block, NULL,
+		      &spare);
+	yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block + 1,
+		      NULL, &spare);
+
+	return YAFFS_OK;
+}
+
+static int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
+				  int block_no,
+				  enum yaffs_block_state *state,
+				  u32 *seq_number)
+{
+	struct yaffs_spare spare0, spare1;
+	static struct yaffs_spare spare_ff;
+	static int init;
+	enum yaffs_ecc_result dummy;
+
+	if (!init) {
+		memset(&spare_ff, 0xff, sizeof(spare_ff));
+		init = 1;
+	}
+
+	*seq_number = 0;
+
+	/* Look for bad block markers in the first two chunks */
+	yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block,
+			    NULL, &spare0, &dummy, 0);
+	yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block + 1,
+			    NULL, &spare1, &dummy, 0);
+
+	if (hweight8(spare0.block_status & spare1.block_status) < 7)
+		*state = YAFFS_BLOCK_STATE_DEAD;
+	else if (memcmp(&spare_ff, &spare0, sizeof(spare_ff)) == 0)
+		*state = YAFFS_BLOCK_STATE_EMPTY;
+	else
+		*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
+
+	return YAFFS_OK;
+}
+
+void yaffs_tags_compat_install(struct yaffs_dev *dev)
+{
+	if(dev->param.is_yaffs2)
+		return;
+	if(!dev->tagger.write_chunk_tags_fn)
+		dev->tagger.write_chunk_tags_fn = yaffs_tags_compat_wr;
+	if(!dev->tagger.read_chunk_tags_fn)
+		dev->tagger.read_chunk_tags_fn = yaffs_tags_compat_rd;
+	if(!dev->tagger.query_block_fn)
+		dev->tagger.query_block_fn = yaffs_tags_compat_query_block;
+	if(!dev->tagger.mark_bad_fn)
+		dev->tagger.mark_bad_fn = yaffs_tags_compat_mark_bad;
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_tagscompat.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_tagscompat.h
--- linux-4.13.3/fs/yaffs2/yaffs_tagscompat.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_tagscompat.h	2018-01-10 15:09:56.577935391 +0800
@@ -0,0 +1,44 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_TAGSCOMPAT_H__
+#define __YAFFS_TAGSCOMPAT_H__
+
+
+#include "yaffs_guts.h"
+
+#if 0
+
+
+int yaffs_tags_compat_wr(struct yaffs_dev *dev,
+			 int nand_chunk,
+			 const u8 *data, const struct yaffs_ext_tags *tags);
+int yaffs_tags_compat_rd(struct yaffs_dev *dev,
+			 int nand_chunk,
+			 u8 *data, struct yaffs_ext_tags *tags);
+int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int block_no);
+int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
+				  int block_no,
+				  enum yaffs_block_state *state,
+				  u32 *seq_number);
+
+#endif
+
+
+void yaffs_tags_compat_install(struct yaffs_dev *dev);
+void yaffs_calc_tags_ecc(struct yaffs_tags *tags);
+int yaffs_check_tags_ecc(struct yaffs_tags *tags);
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_tagsmarshall.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_tagsmarshall.c
--- linux-4.13.3/fs/yaffs2/yaffs_tagsmarshall.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_tagsmarshall.c	2018-01-10 15:09:56.557935939 +0800
@@ -0,0 +1,206 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This file handles the marshalling (ie internal<-->external structure
+ * translation between the internal tags and the stored tags in Yaffs2-style
+ * tags storage.
+ */
+
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yaffs_packedtags2.h"
+
+static int yaffs_tags_marshall_write(struct yaffs_dev *dev,
+				    int nand_chunk, const u8 *data,
+				    const struct yaffs_ext_tags *tags)
+{
+	struct yaffs_packed_tags2 pt;
+	int retval;
+
+	int packed_tags_size =
+	    dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
+	void *packed_tags_ptr =
+	    dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
+
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"yaffs_tags_marshall_write chunk %d data %p tags %p",
+		nand_chunk, data, tags);
+
+	/* For yaffs2 writing there must be both data and tags.
+	 * If we're using inband tags, then the tags are stuffed into
+	 * the end of the data buffer.
+	 */
+	if (!data || !tags)
+		BUG();
+	else if (dev->param.inband_tags) {
+		struct yaffs_packed_tags2_tags_only *pt2tp;
+		pt2tp =
+		    (struct yaffs_packed_tags2_tags_only *)(data +
+							dev->
+							data_bytes_per_chunk);
+		yaffs_pack_tags2_tags_only(dev, pt2tp, tags);
+	} else {
+		yaffs_pack_tags2(dev, &pt, tags, !dev->param.no_tags_ecc);
+	}
+
+	retval = dev->drv.drv_write_chunk_fn(dev, nand_chunk,
+			data, dev->param.total_bytes_per_chunk,
+			(dev->param.inband_tags) ? NULL : packed_tags_ptr,
+			(dev->param.inband_tags) ? 0 : packed_tags_size);
+
+	return retval;
+}
+
+static int yaffs_tags_marshall_read(struct yaffs_dev *dev,
+				   int nand_chunk, u8 *data,
+				   struct yaffs_ext_tags *tags)
+{
+	int retval = 0;
+	int local_data = 0;
+	u8 spare_buffer[100];
+	enum yaffs_ecc_result ecc_result;
+
+	struct yaffs_packed_tags2 pt;
+
+	int packed_tags_size =
+	    dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
+	void *packed_tags_ptr =
+	    dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
+
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"yaffs_tags_marshall_read chunk %d data %p tags %p",
+		nand_chunk, data, tags);
+
+	if (dev->param.inband_tags) {
+		if (!data) {
+			local_data = 1;
+			data = yaffs_get_temp_buffer(dev);
+		}
+	}
+
+	if (dev->param.inband_tags || (data && !tags))
+		retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
+					data, dev->param.total_bytes_per_chunk,
+					NULL, 0,
+					&ecc_result);
+	else if (tags)
+		retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
+					data, dev->param.total_bytes_per_chunk,
+					spare_buffer, packed_tags_size,
+					&ecc_result);
+	else
+		BUG();
+
+
+	if (retval == YAFFS_FAIL)
+		return YAFFS_FAIL;
+
+	if (dev->param.inband_tags) {
+		if (tags) {
+			struct yaffs_packed_tags2_tags_only *pt2tp;
+			pt2tp =
+				(struct yaffs_packed_tags2_tags_only *)
+				&data[dev->data_bytes_per_chunk];
+			yaffs_unpack_tags2_tags_only(dev, tags, pt2tp);
+		}
+	} else if (tags) {
+		memcpy(packed_tags_ptr, spare_buffer, packed_tags_size);
+		yaffs_unpack_tags2(dev, tags, &pt, !dev->param.no_tags_ecc);
+	}
+
+	if (local_data)
+		yaffs_release_temp_buffer(dev, data);
+
+	if (tags && ecc_result == YAFFS_ECC_RESULT_UNFIXED) {
+		tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
+		dev->n_ecc_unfixed++;
+	}
+
+	if (tags && ecc_result == YAFFS_ECC_RESULT_FIXED) {
+		if (tags->ecc_result <= YAFFS_ECC_RESULT_NO_ERROR)
+			tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
+		dev->n_ecc_fixed++;
+	}
+
+	if (ecc_result < YAFFS_ECC_RESULT_UNFIXED)
+		return YAFFS_OK;
+	else
+		return YAFFS_FAIL;
+}
+
+static int yaffs_tags_marshall_query_block(struct yaffs_dev *dev, int block_no,
+			       enum yaffs_block_state *state,
+			       u32 *seq_number)
+{
+	int retval;
+
+	yaffs_trace(YAFFS_TRACE_MTD, "yaffs_tags_marshall_query_block %d",
+			block_no);
+
+	retval = dev->drv.drv_check_bad_fn(dev, block_no);
+
+	if (retval== YAFFS_FAIL) {
+		yaffs_trace(YAFFS_TRACE_MTD, "block is bad");
+
+		*state = YAFFS_BLOCK_STATE_DEAD;
+		*seq_number = 0;
+	} else {
+		struct yaffs_ext_tags t;
+
+		yaffs_tags_marshall_read(dev,
+				    block_no * dev->param.chunks_per_block,
+				    NULL, &t);
+
+		if (t.chunk_used) {
+			*seq_number = t.seq_number;
+			*state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
+		} else {
+			*seq_number = 0;
+			*state = YAFFS_BLOCK_STATE_EMPTY;
+		}
+	}
+
+	yaffs_trace(YAFFS_TRACE_MTD,
+		"block query returns  seq %d state %d",
+		*seq_number, *state);
+
+	if (retval == 0)
+		return YAFFS_OK;
+	else
+		return YAFFS_FAIL;
+}
+
+static int yaffs_tags_marshall_mark_bad(struct yaffs_dev *dev, int block_no)
+{
+	return dev->drv.drv_mark_bad_fn(dev, block_no);
+
+}
+
+
+void yaffs_tags_marshall_install(struct yaffs_dev *dev)
+{
+	if (!dev->param.is_yaffs2)
+		return;
+
+	if (!dev->tagger.write_chunk_tags_fn)
+		dev->tagger.write_chunk_tags_fn = yaffs_tags_marshall_write;
+
+	if (!dev->tagger.read_chunk_tags_fn)
+		dev->tagger.read_chunk_tags_fn = yaffs_tags_marshall_read;
+
+	if (!dev->tagger.query_block_fn)
+		dev->tagger.query_block_fn = yaffs_tags_marshall_query_block;
+
+	if (!dev->tagger.mark_bad_fn)
+		dev->tagger.mark_bad_fn = yaffs_tags_marshall_mark_bad;
+
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_tagsmarshall.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_tagsmarshall.h
--- linux-4.13.3/fs/yaffs2/yaffs_tagsmarshall.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_tagsmarshall.h	2018-01-10 15:09:56.577935391 +0800
@@ -0,0 +1,22 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_TAGSMARSHALL_H__
+#define __YAFFS_TAGSMARSHALL_H__
+
+#include "yaffs_guts.h"
+void yaffs_tags_marshall_install(struct yaffs_dev *dev);
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_trace.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_trace.h
--- linux-4.13.3/fs/yaffs2/yaffs_trace.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_trace.h	2018-01-10 15:09:56.577935391 +0800
@@ -0,0 +1,57 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YTRACE_H__
+#define __YTRACE_H__
+
+extern unsigned int yaffs_trace_mask;
+extern unsigned int yaffs_wr_attempts;
+
+/*
+ * Tracing flags.
+ * The flags masked in YAFFS_TRACE_ALWAYS are always traced.
+ */
+
+#define YAFFS_TRACE_OS			0x00000002
+#define YAFFS_TRACE_ALLOCATE		0x00000004
+#define YAFFS_TRACE_SCAN		0x00000008
+#define YAFFS_TRACE_BAD_BLOCKS		0x00000010
+#define YAFFS_TRACE_ERASE		0x00000020
+#define YAFFS_TRACE_GC			0x00000040
+#define YAFFS_TRACE_WRITE		0x00000080
+#define YAFFS_TRACE_TRACING		0x00000100
+#define YAFFS_TRACE_DELETION		0x00000200
+#define YAFFS_TRACE_BUFFERS		0x00000400
+#define YAFFS_TRACE_NANDACCESS		0x00000800
+#define YAFFS_TRACE_GC_DETAIL		0x00001000
+#define YAFFS_TRACE_SCAN_DEBUG		0x00002000
+#define YAFFS_TRACE_MTD			0x00004000
+#define YAFFS_TRACE_CHECKPOINT		0x00008000
+
+#define YAFFS_TRACE_VERIFY		0x00010000
+#define YAFFS_TRACE_VERIFY_NAND		0x00020000
+#define YAFFS_TRACE_VERIFY_FULL		0x00040000
+#define YAFFS_TRACE_VERIFY_ALL		0x000f0000
+
+#define YAFFS_TRACE_SYNC		0x00100000
+#define YAFFS_TRACE_BACKGROUND		0x00200000
+#define YAFFS_TRACE_LOCK		0x00400000
+#define YAFFS_TRACE_MOUNT		0x00800000
+
+#define YAFFS_TRACE_ERROR		0x40000000
+#define YAFFS_TRACE_BUG			0x80000000
+#define YAFFS_TRACE_ALWAYS		0xf0000000
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_verify.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_verify.c
--- linux-4.13.3/fs/yaffs2/yaffs_verify.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_verify.c	2018-01-10 15:09:56.565935720 +0800
@@ -0,0 +1,540 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_verify.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+
+int yaffs_skip_verification(struct yaffs_dev *dev)
+{
+	(void) dev;
+	return !(yaffs_trace_mask &
+		 (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_skip_full_verification(struct yaffs_dev *dev)
+{
+	(void) dev;
+	return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_skip_nand_verification(struct yaffs_dev *dev)
+{
+	(void) dev;
+	return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_NAND));
+}
+
+static const char * const block_state_name[] = {
+	"Unknown",
+	"Needs scan",
+	"Scanning",
+	"Empty",
+	"Allocating",
+	"Full",
+	"Dirty",
+	"Checkpoint",
+	"Collecting",
+	"Dead"
+};
+
+void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi, int n)
+{
+	int actually_used;
+	int in_use;
+
+	if (yaffs_skip_verification(dev))
+		return;
+
+	/* Report illegal runtime states */
+	if (bi->block_state >= YAFFS_NUMBER_OF_BLOCK_STATES)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Block %d has undefined state %d",
+			n, bi->block_state);
+
+	switch (bi->block_state) {
+	case YAFFS_BLOCK_STATE_UNKNOWN:
+	case YAFFS_BLOCK_STATE_SCANNING:
+	case YAFFS_BLOCK_STATE_NEEDS_SCAN:
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Block %d has bad run-state %s",
+			n, block_state_name[bi->block_state]);
+	}
+
+	/* Check pages in use and soft deletions are legal */
+
+	actually_used = bi->pages_in_use - bi->soft_del_pages;
+
+	if (bi->pages_in_use < 0 ||
+	    bi->pages_in_use > (int)dev->param.chunks_per_block ||
+	    bi->soft_del_pages < 0 ||
+	    bi->soft_del_pages > (int)dev->param.chunks_per_block ||
+	    actually_used < 0 || actually_used > (int)dev->param.chunks_per_block)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Block %d has illegal values pages_in_used %d soft_del_pages %d",
+			n, bi->pages_in_use, bi->soft_del_pages);
+
+	/* Check chunk bitmap legal */
+	in_use = yaffs_count_chunk_bits(dev, n);
+	if (in_use != bi->pages_in_use)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Block %d has inconsistent values pages_in_use %d counted chunk bits %d",
+			n, bi->pages_in_use, in_use);
+}
+
+void yaffs_verify_collected_blk(struct yaffs_dev *dev,
+				struct yaffs_block_info *bi, int n)
+{
+	yaffs_verify_blk(dev, bi, n);
+
+	/* After collection the block should be in the erased state */
+
+	if (bi->block_state != YAFFS_BLOCK_STATE_COLLECTING &&
+	    bi->block_state != YAFFS_BLOCK_STATE_EMPTY) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"Block %d is in state %d after gc, should be erased",
+			n, bi->block_state);
+	}
+}
+
+void yaffs_verify_blocks(struct yaffs_dev *dev)
+{
+	u32 i;
+	u32 state_count[YAFFS_NUMBER_OF_BLOCK_STATES];
+	int illegal_states = 0;
+
+	if (yaffs_skip_verification(dev))
+		return;
+
+	memset(state_count, 0, sizeof(state_count));
+
+	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
+		yaffs_verify_blk(dev, bi, i);
+
+		if (bi->block_state < YAFFS_NUMBER_OF_BLOCK_STATES)
+			state_count[bi->block_state]++;
+		else
+			illegal_states++;
+	}
+
+	yaffs_trace(YAFFS_TRACE_VERIFY,	"Block summary");
+
+	yaffs_trace(YAFFS_TRACE_VERIFY,
+		"%d blocks have illegal states",
+		illegal_states);
+	if (state_count[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Too many allocating blocks");
+
+	for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"%s %d blocks",
+			block_state_name[i], state_count[i]);
+
+	if (dev->blocks_in_checkpt != state_count[YAFFS_BLOCK_STATE_CHECKPOINT])
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Checkpoint block count wrong dev %d count %d",
+			dev->blocks_in_checkpt,
+			state_count[YAFFS_BLOCK_STATE_CHECKPOINT]);
+
+	if (dev->n_erased_blocks != (int)state_count[YAFFS_BLOCK_STATE_EMPTY])
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Erased block count wrong dev %d count %d",
+			dev->n_erased_blocks,
+			state_count[YAFFS_BLOCK_STATE_EMPTY]);
+
+	if (state_count[YAFFS_BLOCK_STATE_COLLECTING] > 1)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Too many collecting blocks %d (max is 1)",
+			state_count[YAFFS_BLOCK_STATE_COLLECTING]);
+}
+
+/*
+ * Verify the object header. oh must be valid, but obj and tags may be NULL in
+ * which case those tests will not be performed.
+ */
+void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh,
+		     struct yaffs_ext_tags *tags, int parent_check)
+{
+	if (obj && yaffs_skip_verification(obj->my_dev))
+		return;
+
+	if (!(tags && obj && oh)) {
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Verifying object header tags %p obj %p oh %p",
+			tags, obj, oh);
+		return;
+	}
+
+	if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
+	    oh->type > YAFFS_OBJECT_TYPE_MAX)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header type is illegal value 0x%x",
+			tags->obj_id, oh->type);
+
+	if (tags->obj_id != obj->obj_id)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header mismatch obj_id %d",
+			tags->obj_id, obj->obj_id);
+
+	/*
+	 * Check that the object's parent ids match if parent_check requested.
+	 *
+	 * Tests do not apply to the root object.
+	 */
+
+	if (parent_check && tags->obj_id > 1 && !obj->parent)
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header mismatch parent_id %d obj->parent is NULL",
+			tags->obj_id, oh->parent_obj_id);
+
+	if (parent_check && obj->parent &&
+	    oh->parent_obj_id !=  obj->parent->obj_id &&
+	    (oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED ||
+	     obj->parent->obj_id != YAFFS_OBJECTID_DELETED))
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header mismatch parent_id %d parent_obj_id %d",
+			tags->obj_id, oh->parent_obj_id,
+			obj->parent->obj_id);
+
+	if (tags->obj_id > 1 && oh->name[0] == 0)	/* Null name */
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header name is NULL",
+			obj->obj_id);
+
+	if (tags->obj_id > 1 && ((u8) (oh->name[0])) == 0xff)	/* Junk name */
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d header name is 0xff",
+			obj->obj_id);
+}
+
+void yaffs_verify_file(struct yaffs_obj *obj)
+{
+	u32 x;
+	int required_depth;
+	int last_chunk;
+	u32 offset_in_chunk;
+	u32 the_chunk;
+
+	int i;
+	struct yaffs_dev *dev;
+	struct yaffs_ext_tags tags;
+	struct yaffs_tnode *tn;
+	u32 obj_id;
+
+	if (!obj)
+		return;
+
+	if (yaffs_skip_verification(obj->my_dev))
+		return;
+
+	dev = obj->my_dev;
+	obj_id = obj->obj_id;
+
+
+	/* Check file size is consistent with tnode depth */
+	yaffs_addr_to_chunk(dev, obj->variant.file_variant.file_size,
+				&last_chunk, &offset_in_chunk);
+	last_chunk++;
+	x = last_chunk >> YAFFS_TNODES_LEVEL0_BITS;
+	required_depth = 0;
+	while (x > 0) {
+		x >>= YAFFS_TNODES_INTERNAL_BITS;
+		required_depth++;
+	}
+
+	/* Check that the chunks in the tnode tree are all correct.
+	 * We do this by scanning through the tnode tree and
+	 * checking the tags for every chunk match.
+	 */
+
+	if (yaffs_skip_nand_verification(dev))
+		return;
+
+	for (i = 1; i <= last_chunk; i++) {
+		tn = yaffs_find_tnode_0(dev, &obj->variant.file_variant, i);
+
+		if (!tn)
+			continue;
+
+		the_chunk = yaffs_get_group_base(dev, tn, i);
+		if (the_chunk > 0) {
+			yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
+						 &tags);
+			if (tags.obj_id != obj_id || tags.chunk_id != (u32)i)
+				yaffs_trace(YAFFS_TRACE_VERIFY,
+					"Object %d chunk_id %d NAND mismatch chunk %d tags (%d:%d)",
+					obj_id, i, the_chunk,
+					tags.obj_id, tags.chunk_id);
+		}
+	}
+}
+
+void yaffs_verify_link(struct yaffs_obj *obj)
+{
+	if (obj && yaffs_skip_verification(obj->my_dev))
+		return;
+
+	/* Verify sane equivalent object */
+}
+
+void yaffs_verify_symlink(struct yaffs_obj *obj)
+{
+	if (obj && yaffs_skip_verification(obj->my_dev))
+		return;
+
+	/* Verify symlink string */
+}
+
+void yaffs_verify_special(struct yaffs_obj *obj)
+{
+	if (obj && yaffs_skip_verification(obj->my_dev))
+		return;
+}
+
+void yaffs_verify_obj(struct yaffs_obj *obj)
+{
+	struct yaffs_dev *dev;
+	u32 chunk_min;
+	u32 chunk_max;
+	u32 chunk_id_ok;
+	u32 chunk_in_range;
+	u32 chunk_wrongly_deleted;
+	u32 chunk_valid;
+
+	if (!obj)
+		return;
+
+	if (obj->being_created)
+		return;
+
+	dev = obj->my_dev;
+
+	if (yaffs_skip_verification(dev))
+		return;
+
+	/* Check sane object header chunk */
+
+	chunk_min = dev->internal_start_block * dev->param.chunks_per_block;
+	chunk_max =
+	    (dev->internal_end_block + 1) * dev->param.chunks_per_block - 1;
+
+	chunk_in_range = (((unsigned)(obj->hdr_chunk)) >= chunk_min &&
+			  ((unsigned)(obj->hdr_chunk)) <= chunk_max);
+	chunk_id_ok = chunk_in_range || (obj->hdr_chunk == 0);
+	chunk_valid = chunk_in_range &&
+	    yaffs_check_chunk_bit(dev,
+				  obj->hdr_chunk / dev->param.chunks_per_block,
+				  obj->hdr_chunk % dev->param.chunks_per_block);
+	chunk_wrongly_deleted = chunk_in_range && !chunk_valid;
+
+	if (!obj->fake && (!chunk_id_ok || chunk_wrongly_deleted))
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d has chunk_id %d %s %s",
+			obj->obj_id, obj->hdr_chunk,
+			chunk_id_ok ? "" : ",out of range",
+			chunk_wrongly_deleted ? ",marked as deleted" : "");
+
+	if (chunk_valid && !yaffs_skip_nand_verification(dev)) {
+		struct yaffs_ext_tags tags;
+		struct yaffs_obj_hdr *oh;
+		u8 *buffer = yaffs_get_temp_buffer(dev);
+
+		oh = (struct yaffs_obj_hdr *)buffer;
+
+		yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, buffer, &tags);
+
+		yaffs_verify_oh(obj, oh, &tags, 1);
+
+		yaffs_release_temp_buffer(dev, buffer);
+	}
+
+	/* Verify it has a parent */
+	if (obj && !obj->fake && (!obj->parent || obj->parent->my_dev != dev)) {
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d has parent pointer %p which does not look like an object",
+			obj->obj_id, obj->parent);
+	}
+
+	/* Verify parent is a directory */
+	if (obj->parent &&
+	    obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d's parent is not a directory (type %d)",
+			obj->obj_id, obj->parent->variant_type);
+	}
+
+	switch (obj->variant_type) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		yaffs_verify_file(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		yaffs_verify_symlink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		yaffs_verify_dir(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		yaffs_verify_link(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		yaffs_verify_special(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+	default:
+		yaffs_trace(YAFFS_TRACE_VERIFY,
+			"Obj %d has illegaltype %d",
+		   obj->obj_id, obj->variant_type);
+		break;
+	}
+}
+
+void yaffs_verify_objects(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj;
+	int i;
+	struct list_head *lh;
+
+	if (yaffs_skip_verification(dev))
+		return;
+
+	/* Iterate through the objects in each hash entry */
+
+	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+		list_for_each(lh, &dev->obj_bucket[i].list) {
+			obj = list_entry(lh, struct yaffs_obj, hash_link);
+			yaffs_verify_obj(obj);
+		}
+	}
+}
+
+void yaffs_verify_obj_in_dir(struct yaffs_obj *obj)
+{
+	struct list_head *lh;
+	struct yaffs_obj *list_obj;
+	int count = 0;
+
+	if (!obj) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "No object to verify");
+		BUG();
+		return;
+	}
+
+	if (yaffs_skip_verification(obj->my_dev))
+		return;
+
+	if (!obj->parent) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "Object does not have parent");
+		BUG();
+		return;
+	}
+
+	if (obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "Parent is not directory");
+		BUG();
+	}
+
+	/* Iterate through the objects in each hash entry */
+
+	list_for_each(lh, &obj->parent->variant.dir_variant.children) {
+		list_obj = list_entry(lh, struct yaffs_obj, siblings);
+		yaffs_verify_obj(list_obj);
+		if (obj == list_obj)
+			count++;
+	}
+
+	if (count != 1) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"Object in directory %d times",
+			count);
+		BUG();
+	}
+}
+
+void yaffs_verify_dir(struct yaffs_obj *directory)
+{
+	struct list_head *lh;
+	struct yaffs_obj *list_obj;
+	struct yaffs_dev *dev;
+
+	if (!directory) {
+		BUG();
+		return;
+	}
+
+	dev = directory->my_dev;
+
+	if (!dev) {
+		BUG();
+		return;
+	}
+
+	if (directory == dev->root_dir ||
+	    directory == dev->lost_n_found ||
+	    directory == dev->unlinked_dir ||
+	    directory == dev->del_dir)
+		return;
+
+	if (yaffs_skip_full_verification(directory->my_dev))
+		return;
+
+	if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"Directory has wrong type: %d",
+			directory->variant_type);
+		BUG();
+	}
+
+	/* Iterate through the objects in each hash entry */
+
+	list_for_each(lh, &directory->variant.dir_variant.children) {
+		list_obj = list_entry(lh, struct yaffs_obj, siblings);
+		if (list_obj->parent != directory) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"Object in directory list has wrong parent %p",
+				list_obj->parent);
+			BUG();
+		}
+		yaffs_verify_obj_in_dir(list_obj);
+	}
+}
+
+static int yaffs_free_verification_failures;
+
+void yaffs_verify_free_chunks(struct yaffs_dev *dev)
+{
+	int counted;
+	int difference;
+
+	if (yaffs_skip_verification(dev))
+		return;
+
+	counted = yaffs_count_free_chunks(dev);
+
+	difference = dev->n_free_chunks - counted;
+
+	if (difference) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"Freechunks verification failure %d %d %d",
+			dev->n_free_chunks, counted, difference);
+		yaffs_free_verification_failures++;
+	}
+}
+
+int yaffs_verify_file_sane(struct yaffs_obj *in)
+{
+	(void) in;
+	return YAFFS_OK;
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_verify.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_verify.h
--- linux-4.13.3/fs/yaffs2/yaffs_verify.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_verify.h	2018-01-10 15:09:56.577935391 +0800
@@ -0,0 +1,43 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_VERIFY_H__
+#define __YAFFS_VERIFY_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi,
+		      int n);
+void yaffs_verify_collected_blk(struct yaffs_dev *dev,
+				struct yaffs_block_info *bi, int n);
+void yaffs_verify_blocks(struct yaffs_dev *dev);
+
+void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh,
+		     struct yaffs_ext_tags *tags, int parent_check);
+void yaffs_verify_file(struct yaffs_obj *obj);
+void yaffs_verify_link(struct yaffs_obj *obj);
+void yaffs_verify_symlink(struct yaffs_obj *obj);
+void yaffs_verify_special(struct yaffs_obj *obj);
+void yaffs_verify_obj(struct yaffs_obj *obj);
+void yaffs_verify_objects(struct yaffs_dev *dev);
+void yaffs_verify_obj_in_dir(struct yaffs_obj *obj);
+void yaffs_verify_dir(struct yaffs_obj *directory);
+void yaffs_verify_free_chunks(struct yaffs_dev *dev);
+
+int yaffs_verify_file_sane(struct yaffs_obj *obj);
+
+int yaffs_skip_verification(struct yaffs_dev *dev);
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_vfs.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_vfs.c
--- linux-4.13.3/fs/yaffs2/yaffs_vfs.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_vfs.c	2018-01-10 15:09:56.537936488 +0800
@@ -0,0 +1,3751 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ * Acknowledgements:
+ * Luc van OostenRyck for numerous patches.
+ * Nick Bane for numerous patches.
+ * Nick Bane for 2.5/2.6 integration.
+ * Andras Toth for mknod rdev issue.
+ * Michael Fischer for finding the problem with inode inconsistency.
+ * Some code bodily lifted from JFFS
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ *
+ * This is the file system front-end to YAFFS that hooks it up to
+ * the VFS.
+ *
+ * Special notes:
+ * >> 2.4: sb->u.generic_sbp points to the struct yaffs_dev associated with
+ *         this superblock
+ * >> 2.6: sb->s_fs_info  points to the struct yaffs_dev associated with this
+ *         superblock
+ * >> inode->u.generic_ip points to the associated struct yaffs_obj.
+ */
+
+/*
+ * There are two variants of the VFS glue code. This variant should compile
+ * for any version of Linux.
+ */
+#include <linux/version.h>
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10))
+#define YAFFS_COMPILE_BACKGROUND
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 23))
+#define YAFFS_COMPILE_FREEZER
+#endif
+#endif
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28))
+#define YAFFS_COMPILE_EXPORTFS
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35))
+#define YAFFS_USE_SETATTR_COPY
+#define YAFFS_USE_TRUNCATE_SETSIZE
+#endif
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35))
+#define YAFFS_HAS_EVICT_INODE
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13)) && \
+    (LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0))
+#define YAFFS_NEW_FOLLOW_LINK 1
+#else
+#define YAFFS_NEW_FOLLOW_LINK 0
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0))
+#define YAFFS_HAS_WRITE_SUPER
+#endif
+
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
+#include <linux/config.h>
+#endif
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39))
+#include <linux/smp_lock.h>
+#endif
+#include <linux/pagemap.h>
+#include <linux/mtd/mtd.h>
+#include <linux/interrupt.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+#include <linux/namei.h>
+#endif
+
+#ifdef YAFFS_COMPILE_EXPORTFS
+#include <linux/exportfs.h>
+#endif
+
+#ifdef YAFFS_COMPILE_BACKGROUND
+#include <linux/kthread.h>
+#include <linux/delay.h>
+#endif
+#ifdef YAFFS_COMPILE_FREEZER
+#include <linux/freezer.h>
+#endif
+
+#include <asm/div64.h>
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+
+#include <linux/statfs.h>
+
+#define UnlockPage(p) unlock_page(p)
+#define Page_Uptodate(page)	test_bit(PG_uptodate, &(page)->flags)
+
+/* FIXME: use sb->s_id instead ? */
+#define yaffs_devname(sb, buf)	bdevname(sb->s_bdev, buf)
+
+#else
+
+#include <linux/locks.h>
+#define	BDEVNAME_SIZE		0
+#define	yaffs_devname(sb, buf)	kdevname(sb->s_dev)
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
+/* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
+#define __user
+#endif
+
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
+#define YPROC_ROOT  (&proc_root)
+#else
+#define YPROC_ROOT  NULL
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
+#define Y_INIT_TIMER(a)	init_timer(a)
+#else
+#define Y_INIT_TIMER(a)	init_timer_on_stack(a)
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
+#define YAFFS_USE_WRITE_BEGIN_END 1
+#else
+#define YAFFS_USE_WRITE_BEGIN_END 0
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0))
+#define YAFFS_SUPER_HAS_DIRTY
+#endif
+
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0))
+#define set_nlink(inode, count)  do { (inode)->i_nlink = (count); } while(0)
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
+static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
+{
+	uint64_t result = partition_size;
+	do_div(result, block_size);
+	return (uint32_t) result;
+}
+#else
+#define YCALCBLOCKS(s, b) ((s)/(b))
+#endif
+
+#include <linux/uaccess.h>
+#include <linux/mtd/mtd.h>
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_guts.h"
+#include "yaffs_attribs.h"
+
+#include "yaffs_linux.h"
+
+#include "yaffs_mtdif.h"
+#include "yaffs_packedtags2.h"
+#include "yaffs_getblockinfo.h"
+
+unsigned int yaffs_trace_mask =
+		YAFFS_TRACE_BAD_BLOCKS |
+		YAFFS_TRACE_ALWAYS |
+		0;
+
+unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
+unsigned int yaffs_auto_checkpoint = 1;
+unsigned int yaffs_gc_control = 1;
+unsigned int yaffs_bg_enable = 1;
+unsigned int yaffs_auto_select = 1;
+/* Module Parameters */
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+module_param(yaffs_trace_mask, uint, 0644);
+module_param(yaffs_wr_attempts, uint, 0644);
+module_param(yaffs_auto_checkpoint, uint, 0644);
+module_param(yaffs_gc_control, uint, 0644);
+module_param(yaffs_bg_enable, uint, 0644);
+#else
+MODULE_PARM(yaffs_trace_mask, "i");
+MODULE_PARM(yaffs_wr_attempts, "i");
+MODULE_PARM(yaffs_auto_checkpoint, "i");
+MODULE_PARM(yaffs_gc_control, "i");
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
+/* use iget and read_inode */
+#define Y_IGET(sb, inum) iget((sb), (inum))
+
+#else
+/* Call local equivalent */
+#define YAFFS_USE_OWN_IGET
+#define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
+
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
+#define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
+#else
+#define yaffs_inode_to_obj_lv(iptr) ((iptr)->u.generic_ip)
+#endif
+
+#define yaffs_inode_to_obj(iptr) \
+	((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
+#define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+#define yaffs_super_to_dev(sb)	((struct yaffs_dev *)sb->s_fs_info)
+#else
+#define yaffs_super_to_dev(sb)	((struct yaffs_dev *)sb->u.generic_sbp)
+#endif
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0))
+#define Y_CLEAR_INODE(i) clear_inode(i)
+#else
+#define Y_CLEAR_INODE(i) end_writeback(i)
+#endif
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 12, 0))
+#define YAFFS_USE_DIR_ITERATE
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0))
+#define YAFFS_USE_XATTR
+#endif
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,12,0))
+#define YAFFS_NEW_PROCFS
+#include <linux/seq_file.h>
+#endif
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 8, 0))
+#define PAGE_CACHE_SIZE PAGE_SIZE
+#define PAGE_CACHE_SHIFT PAGE_SHIFT
+#define Y_GET_DENTRY(f) ((f)->f_path.dentry)
+#define page_cache_release put_page
+#define YAFFS_NEW_XATTR 1
+#define YAFFS_NEW_GET_LINK 1
+#else
+#define Y_GET_DENTRY(f) ((f)->f_dentry)
+#define YAFFS_NEW_XATTR 0
+#define YAFFS_NEW_GET_LINK 0
+#endif
+
+#define update_dir_time(dir) do {\
+			(dir)->i_ctime = (dir)->i_mtime = current_kernel_time(); \
+		} while (0)
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 9, 0))
+static inline int setattr_prepare(struct dentry *dentry, struct iattr *attr)
+{
+	return inode_change_ok(dentry->d_inode, attr);
+}
+#endif
+
+static void yaffs_fill_inode_from_obj(struct inode *inode,
+				      struct yaffs_obj *obj);
+
+
+static void yaffs_gross_lock(struct yaffs_dev *dev)
+{
+	yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current);
+	mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock));
+	yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current);
+}
+
+static void yaffs_gross_unlock(struct yaffs_dev *dev)
+{
+	yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current);
+	mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock));
+}
+
+
+static int yaffs_readpage_nolock(struct file *f, struct page *pg)
+{
+	/* Lifted from jffs2 */
+
+	struct yaffs_obj *obj;
+	unsigned char *pg_buf;
+	int ret;
+	loff_t pos = ((loff_t) pg->index) << PAGE_SHIFT;
+	struct yaffs_dev *dev;
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_readpage_nolock at %lld, size %08x",
+		(long long)pos,
+		(unsigned)PAGE_SIZE);
+
+	obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
+
+	dev = obj->my_dev;
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+	BUG_ON(!PageLocked(pg));
+#else
+	if (!PageLocked(pg))
+		PAGE_BUG(pg);
+#endif
+
+	pg_buf = kmap(pg);
+	/* FIXME: Can kmap fail? */
+
+	yaffs_gross_lock(dev);
+
+	ret = yaffs_file_rd(obj, pg_buf, pos, PAGE_CACHE_SIZE);
+
+	yaffs_gross_unlock(dev);
+
+	if (ret >= 0)
+		ret = 0;
+
+	if (ret) {
+		ClearPageUptodate(pg);
+		SetPageError(pg);
+	} else {
+		SetPageUptodate(pg);
+		ClearPageError(pg);
+	}
+
+	flush_dcache_page(pg);
+	kunmap(pg);
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
+	return ret;
+}
+
+static int yaffs_readpage_unlock(struct file *f, struct page *pg)
+{
+	int ret = yaffs_readpage_nolock(f, pg);
+	UnlockPage(pg);
+	return ret;
+}
+
+static int yaffs_readpage(struct file *f, struct page *pg)
+{
+	int ret;
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
+	ret = yaffs_readpage_unlock(f, pg);
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
+	return ret;
+}
+
+
+static void yaffs_set_super_dirty_val(struct yaffs_dev *dev, int val)
+{
+	struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev);
+
+	if (lc)
+		lc->dirty = val;
+
+# ifdef YAFFS_SUPER_HAS_DIRTY
+	{
+		struct super_block *sb = lc->super;
+
+		if (sb)
+			sb->s_dirt = val;
+	}
+#endif
+
+}
+
+static void yaffs_set_super_dirty(struct yaffs_dev *dev)
+{
+	yaffs_set_super_dirty_val(dev, 1);
+}
+
+static void yaffs_clear_super_dirty(struct yaffs_dev *dev)
+{
+	yaffs_set_super_dirty_val(dev, 0);
+}
+
+static int yaffs_check_super_dirty(struct yaffs_dev *dev)
+{
+	struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev);
+
+	if (lc && lc->dirty)
+		return 1;
+
+# ifdef YAFFS_SUPER_HAS_DIRTY
+	{
+		struct super_block *sb = lc->super;
+
+		if (sb && sb->s_dirt)
+			return 1;
+	}
+#endif
+	return 0;
+
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
+#else
+static int yaffs_writepage(struct page *page)
+#endif
+{
+	struct yaffs_dev *dev;
+	struct address_space *mapping = page->mapping;
+	struct inode *inode;
+	unsigned long end_index;
+	char *buffer;
+	struct yaffs_obj *obj;
+	int n_written = 0;
+	unsigned n_bytes;
+	loff_t i_size;
+
+	if (!mapping)
+		BUG();
+	inode = mapping->host;
+	if (!inode)
+		BUG();
+	i_size = i_size_read(inode);
+
+	end_index = i_size >> PAGE_CACHE_SHIFT;
+
+	if (page->index < end_index)
+		n_bytes = PAGE_CACHE_SIZE;
+	else {
+		n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
+
+		if (page->index > end_index || !n_bytes) {
+			yaffs_trace(YAFFS_TRACE_OS,
+				"yaffs_writepage at %lld, inode size = %lld!!",
+				((loff_t)page->index) << PAGE_CACHE_SHIFT,
+				inode->i_size);
+			yaffs_trace(YAFFS_TRACE_OS,
+				"                -> don't care!!");
+
+			zero_user_segment(page, 0, PAGE_CACHE_SIZE);
+			set_page_writeback(page);
+			unlock_page(page);
+			end_page_writeback(page);
+			return 0;
+		}
+	}
+
+	if (n_bytes != PAGE_CACHE_SIZE)
+		zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
+
+	get_page(page);
+
+	buffer = kmap(page);
+
+	obj = yaffs_inode_to_obj(inode);
+	dev = obj->my_dev;
+	yaffs_gross_lock(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_writepage at %lld, size %08x",
+		((loff_t)page->index) << PAGE_CACHE_SHIFT, n_bytes);
+	yaffs_trace(YAFFS_TRACE_OS,
+		"writepag0: obj = %lld, ino = %lld",
+		obj->variant.file_variant.file_size, inode->i_size);
+
+	n_written = yaffs_wr_file(obj, buffer,
+				  ((loff_t)page->index) << PAGE_CACHE_SHIFT, n_bytes, 0);
+
+	yaffs_set_super_dirty(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"writepag1: obj = %lld, ino = %lld",
+		obj->variant.file_variant.file_size, inode->i_size);
+
+	yaffs_gross_unlock(dev);
+
+	kunmap(page);
+	set_page_writeback(page);
+	unlock_page(page);
+	end_page_writeback(page);
+	put_page(page);
+
+	return (n_written == n_bytes) ? 0 : -ENOSPC;
+}
+
+/* Space holding and freeing is done to ensure we have space available for write_begin/end */
+/* For now we just assume few parallel writes and check against a small number. */
+/* Todo: need to do this with a counter to handle parallel reads better */
+
+static ssize_t yaffs_hold_space(struct file *f)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev;
+
+	int n_free_chunks;
+
+	obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
+
+	dev = obj->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	n_free_chunks = yaffs_get_n_free_chunks(dev);
+
+	yaffs_gross_unlock(dev);
+
+	return (n_free_chunks > 20) ? 1 : 0;
+}
+
+static void yaffs_release_space(struct file *f)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev;
+
+	obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
+
+	dev = obj->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	yaffs_gross_unlock(dev);
+}
+
+#if (YAFFS_USE_WRITE_BEGIN_END > 0)
+static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
+			     loff_t pos, unsigned len, unsigned flags,
+			     struct page **pagep, void **fsdata)
+{
+	struct page *pg = NULL;
+	pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+
+	int ret = 0;
+	int space_held = 0;
+
+	/* Get a page */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
+	pg = grab_cache_page_write_begin(mapping, index, flags);
+#else
+	pg = __grab_cache_page(mapping, index);
+#endif
+
+	*pagep = pg;
+	if (!pg) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	yaffs_trace(YAFFS_TRACE_OS,
+		"start yaffs_write_begin index %d(%x) uptodate %d",
+		(int)index, (int)index, Page_Uptodate(pg) ? 1 : 0);
+
+	/* Get fs space */
+	space_held = yaffs_hold_space(filp);
+
+	if (!space_held) {
+		ret = -ENOSPC;
+		goto out;
+	}
+
+	/* Update page if required */
+
+	if (!Page_Uptodate(pg))
+		ret = yaffs_readpage_nolock(filp, pg);
+
+	if (ret)
+		goto out;
+
+	/* Happy path return */
+	yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
+
+	return 0;
+
+out:
+	yaffs_trace(YAFFS_TRACE_OS,
+		"end yaffs_write_begin fail returning %d", ret);
+	if (space_held)
+		yaffs_release_space(filp);
+	if (pg) {
+		unlock_page(pg);
+		page_cache_release(pg);
+	}
+	return ret;
+}
+
+#else
+
+static int yaffs_prepare_write(struct file *f, struct page *pg,
+			       unsigned offset, unsigned to)
+{
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_prepair_write");
+
+	if (!Page_Uptodate(pg))
+		return yaffs_readpage_nolock(f, pg);
+	return 0;
+}
+#endif
+
+
+static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
+				loff_t * pos)
+{
+	struct yaffs_obj *obj;
+	int n_written;
+	loff_t ipos;
+	struct inode *inode;
+	struct yaffs_dev *dev;
+
+	obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
+
+	if (!obj) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_file_write: hey obj is null!");
+                return -EINVAL;
+        }
+
+	dev = obj->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	inode = Y_GET_DENTRY(f)->d_inode;
+
+	if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
+		ipos = inode->i_size;
+	else
+		ipos = *pos;
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_file_write about to write writing %u(%x) bytes to object %d at %lld",
+		(unsigned)n, (unsigned)n, obj->obj_id, ipos);
+
+	n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
+
+	yaffs_set_super_dirty(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_file_write: %d(%x) bytes written",
+		(unsigned)n, (unsigned)n);
+
+	if (n_written > 0) {
+		ipos += n_written;
+		*pos = ipos;
+		if (ipos > inode->i_size) {
+			inode->i_size = ipos;
+			inode->i_blocks = (ipos + 511) >> 9;
+
+			yaffs_trace(YAFFS_TRACE_OS,
+				"yaffs_file_write size updated to %lld bytes, %d blocks",
+				ipos, (int)(inode->i_blocks));
+		}
+
+	}
+	yaffs_gross_unlock(dev);
+	return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
+}
+
+
+#if (YAFFS_USE_WRITE_BEGIN_END > 0)
+static int yaffs_write_end(struct file *filp, struct address_space *mapping,
+			   loff_t pos, unsigned len, unsigned copied,
+			   struct page *pg, void *fsdadata)
+{
+	int ret = 0;
+	void *addr, *kva;
+	uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
+
+	kva = kmap(pg);
+	addr = kva + offset_into_page;
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_write_end addr %p pos %lld n_bytes %d",
+		addr, pos, copied);
+
+	ret = yaffs_file_write(filp, addr, copied, &pos);
+
+	if (ret != copied) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_write_end not same size ret %d  copied %d",
+			ret, copied);
+		SetPageError(pg);
+	}
+
+	kunmap(pg);
+
+	yaffs_release_space(filp);
+	unlock_page(pg);
+	page_cache_release(pg);
+	return ret;
+}
+#else
+
+static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
+			      unsigned to)
+{
+	void *addr, *kva;
+
+	loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
+	int n_bytes = to - offset;
+	int n_written;
+
+	kva = kmap(pg);
+	addr = kva + offset;
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_commit_write addr %p pos %lld n_bytes %d",
+		addr, pos, n_bytes);
+
+	n_written = yaffs_file_write(f, addr, n_bytes, &pos);
+
+	if (n_written != n_bytes) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_commit_write not same size n_written %d  n_bytes %d",
+			n_written, n_bytes);
+		SetPageError(pg);
+	}
+	kunmap(pg);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_commit_write returning %d",
+		n_written == n_bytes ? 0 : n_written);
+
+	return n_written == n_bytes ? 0 : n_written;
+}
+#endif
+
+static struct address_space_operations yaffs_file_address_operations = {
+	.readpage = yaffs_readpage,
+	.writepage = yaffs_writepage,
+#if (YAFFS_USE_WRITE_BEGIN_END > 0)
+	.write_begin = yaffs_write_begin,
+	.write_end = yaffs_write_end,
+#else
+	.prepare_write = yaffs_prepare_write,
+	.commit_write = yaffs_commit_write,
+#endif
+};
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_file_flush(struct file *file, fl_owner_t id)
+#else
+static int yaffs_file_flush(struct file *file)
+#endif
+{
+	struct yaffs_obj *obj = yaffs_dentry_to_obj(Y_GET_DENTRY(file));
+
+	struct yaffs_dev *dev = obj->my_dev;
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_file_flush object %d (%s)",
+		obj->obj_id,
+		obj->dirty ? "dirty" : "clean");
+
+	yaffs_gross_lock(dev);
+
+	yaffs_flush_file(obj, 1, 0, 0);
+
+	yaffs_gross_unlock(dev);
+
+	return 0;
+}
+
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
+static int yaffs_sync_object(struct file *file, loff_t start, loff_t end, int datasync)
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
+static int yaffs_sync_object(struct file *file, int datasync)
+#else
+static int yaffs_sync_object(struct file *file, struct dentry *dentry,
+			     int datasync)
+#endif
+{
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
+	struct dentry *dentry = file->f_path.dentry;
+#endif
+
+	obj = yaffs_dentry_to_obj(dentry);
+
+	dev = obj->my_dev;
+
+	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
+		"yaffs_sync_object");
+	yaffs_gross_lock(dev);
+	yaffs_flush_file(obj, 1, datasync, 0);
+	yaffs_gross_unlock(dev);
+	return 0;
+}
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
+static const struct file_operations yaffs_file_operations = {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 8, 0)
+	.read = new_sync_read,
+	.write = new_sync_write,
+#endif
+	.read_iter = generic_file_read_iter,
+	.write_iter = generic_file_write_iter,
+#else
+	.read = do_sync_read,
+	.write = do_sync_write,
+	.aio_read = generic_file_aio_read,
+	.aio_write = generic_file_aio_write,
+#endif
+	.mmap = generic_file_mmap,
+	.flush = yaffs_file_flush,
+	.fsync = yaffs_sync_object,
+	.splice_read = generic_file_splice_read,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0)
+	.splice_write = iter_file_splice_write,
+#else
+	.splice_write = generic_file_splice_write,
+#endif
+	.llseek = generic_file_llseek,
+};
+
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
+
+static const struct file_operations yaffs_file_operations = {
+	.read = do_sync_read,
+	.write = do_sync_write,
+	.aio_read = generic_file_aio_read,
+	.aio_write = generic_file_aio_write,
+	.mmap = generic_file_mmap,
+	.flush = yaffs_file_flush,
+	.fsync = yaffs_sync_object,
+	.sendfile = generic_file_sendfile,
+};
+
+#else
+
+static const struct file_operations yaffs_file_operations = {
+	.read = generic_file_read,
+	.write = generic_file_write,
+	.mmap = generic_file_mmap,
+	.flush = yaffs_file_flush,
+	.fsync = yaffs_sync_object,
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+	.sendfile = generic_file_sendfile,
+#endif
+};
+#endif
+
+
+
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
+static void zero_user_segment(struct page *page, unsigned start, unsigned end)
+{
+	void *kaddr = kmap_atomic(page, KM_USER0);
+	memset(kaddr + start, 0, end - start);
+	kunmap_atomic(kaddr, KM_USER0);
+	flush_dcache_page(page);
+}
+#endif
+
+
+static int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
+{
+#ifdef YAFFS_USE_TRUNCATE_SETSIZE
+	truncate_setsize(inode, newsize);
+	return 0;
+#else
+	truncate_inode_pages(&inode->i_data, newsize);
+	return 0;
+#endif
+
+}
+
+
+static int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
+{
+#ifdef YAFFS_USE_SETATTR_COPY
+	setattr_copy(inode, attr);
+	return 0;
+#else
+	return inode_setattr(inode, attr);
+#endif
+
+}
+
+static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
+{
+	struct inode *inode = dentry->d_inode;
+	int error = 0;
+	struct yaffs_dev *dev;
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_setattr of object %d",
+		yaffs_inode_to_obj(inode)->obj_id);
+#if 0
+	/* Fail if a requested resize >= 2GB */
+	if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
+		error = -EINVAL;
+#endif
+
+	if (error == 0)
+		error = setattr_prepare(dentry, attr);
+	if (error == 0) {
+		int result;
+		if (!error) {
+			error = yaffs_vfs_setattr(inode, attr);
+			yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
+			if (attr->ia_valid & ATTR_SIZE) {
+				yaffs_vfs_setsize(inode, attr->ia_size);
+				inode->i_blocks = (inode->i_size + 511) >> 9;
+			}
+		}
+		dev = yaffs_inode_to_obj(inode)->my_dev;
+		if (attr->ia_valid & ATTR_SIZE) {
+			yaffs_trace(YAFFS_TRACE_OS,
+				"resize to %d(%x)",
+				(int)(attr->ia_size),
+				(int)(attr->ia_size));
+		}
+		yaffs_gross_lock(dev);
+		result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
+		if (result == YAFFS_OK) {
+			error = 0;
+		} else {
+			error = -EPERM;
+		}
+		yaffs_gross_unlock(dev);
+
+	}
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
+
+	return error;
+}
+
+#ifdef YAFFS_USE_XATTR
+#if (YAFFS_NEW_XATTR > 0)
+static int yaffs_setxattr(struct dentry *dentry, struct inode *inode,
+		const char *name, const void *value, size_t size, int flags)
+{
+#else
+static int yaffs_setxattr(struct dentry *dentry, const char *name,
+		   const void *value, size_t size, int flags)
+{
+	struct inode *inode = dentry->d_inode;
+#endif
+	int error = 0;
+	struct yaffs_dev *dev;
+	struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
+
+	if (error == 0) {
+		int result;
+		dev = obj->my_dev;
+		yaffs_gross_lock(dev);
+		result = yaffs_set_xattrib(obj, name, value, size, flags);
+		if (result == YAFFS_OK)
+			error = 0;
+		else if (result < 0)
+			error = result;
+		yaffs_gross_unlock(dev);
+
+	}
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
+
+	return error;
+}
+
+#ifdef YAFFS_NEW_XATTR
+static ssize_t yaffs_getxattr(struct dentry * dentry, struct inode *inode,
+	const char *name, void *buff, size_t size)
+{
+#else
+static ssize_t yaffs_getxattr(struct dentry * dentry, const char *name,
+			void *buff, size_t size)
+{
+	struct inode *inode = dentry->d_inode;
+#endif
+	int error = 0;
+	struct yaffs_dev *dev;
+	struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_getxattr \"%s\" from object %d",
+		name, obj->obj_id);
+
+	if (error == 0) {
+		dev = obj->my_dev;
+		yaffs_gross_lock(dev);
+		error = yaffs_get_xattrib(obj, name, buff, size);
+		yaffs_gross_unlock(dev);
+
+	}
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error);
+
+	return error;
+}
+
+static int yaffs_removexattr(struct dentry *dentry, const char *name)
+{
+	struct inode *inode = dentry->d_inode;
+	int error = 0;
+	struct yaffs_dev *dev;
+	struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_removexattr of object %d", obj->obj_id);
+
+	if (error == 0) {
+		int result;
+		dev = obj->my_dev;
+		yaffs_gross_lock(dev);
+		result = yaffs_remove_xattrib(obj, name);
+		if (result == YAFFS_OK)
+			error = 0;
+		else if (result < 0)
+			error = result;
+		yaffs_gross_unlock(dev);
+
+	}
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_removexattr done returning %d", error);
+
+	return error;
+}
+#endif
+
+static ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size)
+{
+	struct inode *inode = dentry->d_inode;
+	int error = 0;
+	struct yaffs_dev *dev;
+	struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_listxattr of object %d", obj->obj_id);
+
+	if (error == 0) {
+		dev = obj->my_dev;
+		yaffs_gross_lock(dev);
+		error = yaffs_list_xattrib(obj, buff, size);
+		yaffs_gross_unlock(dev);
+
+	}
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_listxattr done returning %d", error);
+
+	return error;
+}
+
+
+static const struct inode_operations yaffs_file_inode_operations = {
+	.setattr = yaffs_setattr,
+#ifdef YAFFS_USE_XATTR
+	.setxattr = yaffs_setxattr,
+	.getxattr = yaffs_getxattr,
+	.removexattr = yaffs_removexattr,
+#endif
+	.listxattr = yaffs_listxattr,
+};
+
+
+static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
+			  int buflen)
+{
+	unsigned char *alias;
+	int ret;
+
+	struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
+
+	yaffs_gross_unlock(dev);
+
+	if (!alias)
+		return -ENOMEM;
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0)
+	ret = vfs_readlink(dentry, buffer, buflen, alias);
+#else
+	ret = readlink_copy(buffer, buflen, alias);
+#endif
+	kfree(alias);
+	return ret;
+}
+
+#if (YAFFS_NEW_GET_LINK == 0)
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+	void *ret;
+#else
+static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+	int ret
+#endif
+	unsigned char *alias;
+	int ret_int = 0;
+	struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
+	yaffs_gross_unlock(dev);
+
+	if (!alias) {
+		ret_int = -ENOMEM;
+		goto out;
+	}
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+	nd_set_link(nd, alias);
+	ret = alias;
+out:
+	if (ret_int)
+		ret = ERR_PTR(ret_int);
+	return ret;
+#else
+	ret = vfs_follow_link(nd, alias);
+	kfree(alias);
+out:
+	if (ret_int)
+		ret = ret_int;
+	return ret;
+#endif
+}
+#else
+static const char *yaffs_get_link(struct dentry *dentry, struct inode *inode, struct delayed_call *done)
+{
+	unsigned char *alias;
+	struct yaffs_dev *dev;
+
+	if (!dentry)
+		return ERR_PTR(-ECHILD);
+
+	dev = yaffs_dentry_to_obj(dentry)->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
+	yaffs_gross_unlock(dev);
+
+	if (!alias)
+		return ERR_PTR(-ENOMEM);
+	set_delayed_call(done, kfree_link, alias);
+	return alias;
+}
+#endif
+
+#ifdef YAFFS_HAS_PUT_INODE
+
+/* For now put inode is just for debugging
+ * Put inode is called when the inode **structure** is put.
+ */
+static void yaffs_put_inode(struct inode *inode)
+{
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_put_inode: ino %d, count %d"),
+		(int)inode->i_ino, atomic_read(&inode->i_count);
+
+}
+#endif
+
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
+{
+	kfree(alias);
+}
+#endif
+
+static const struct inode_operations yaffs_symlink_inode_operations = {
+	.readlink = yaffs_readlink,
+#if (YAFFS_NEW_GET_LINK == 1)
+	.get_link = yaffs_get_link,
+#else
+	.follow_link = yaffs_follow_link,
+#endif
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+	.put_link = yaffs_put_link,
+#endif
+	.setattr = yaffs_setattr,
+#ifdef YAFFS_USE_XATTR
+	.setxattr = yaffs_setxattr,
+	.getxattr = yaffs_getxattr,
+	.removexattr = yaffs_removexattr,
+#endif
+	.listxattr = yaffs_listxattr,
+};
+
+#ifdef YAFFS_USE_OWN_IGET
+
+static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
+{
+	struct inode *inode;
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", ino);
+
+	inode = iget_locked(sb, ino);
+	if (!inode)
+		return ERR_PTR(-ENOMEM);
+	if (!(inode->i_state & I_NEW))
+		return inode;
+
+	/* NB This is called as a side effect of other functions, but
+	 * we had to release the lock to prevent deadlocks, so
+	 * need to lock again.
+	 */
+
+	yaffs_gross_lock(dev);
+
+	obj = yaffs_find_by_number(dev, inode->i_ino);
+
+	yaffs_fill_inode_from_obj(inode, obj);
+
+	yaffs_gross_unlock(dev);
+
+	unlock_new_inode(inode);
+	return inode;
+}
+
+#else
+
+static void yaffs_read_inode(struct inode *inode)
+{
+	/* NB This is called as a side effect of other functions, but
+	 * we had to release the lock to prevent deadlocks, so
+	 * need to lock again.
+	 */
+
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev = yaffs_super_to_dev(inode->i_sb);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_read_inode for %d", (int)inode->i_ino);
+
+	if (current != yaffs_dev_to_lc(dev)->readdir_process)
+		yaffs_gross_lock(dev);
+
+	obj = yaffs_find_by_number(dev, inode->i_ino);
+
+	yaffs_fill_inode_from_obj(inode, obj);
+
+	if (current != yaffs_dev_to_lc(dev)->readdir_process)
+		yaffs_gross_unlock(dev);
+}
+
+#endif
+
+
+
+struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
+			      struct yaffs_obj *obj)
+{
+	struct inode *inode;
+
+	if (!sb) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_get_inode for NULL super_block!!");
+		return NULL;
+
+	}
+
+	if (!obj) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_get_inode for NULL object!!");
+		return NULL;
+
+	}
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_get_inode for object %d", obj->obj_id);
+
+	inode = Y_IGET(sb, obj->obj_id);
+	if (IS_ERR(inode))
+		return NULL;
+
+	/* NB Side effect: iget calls back to yaffs_read_inode(). */
+	/* iget also increments the inode's i_count */
+	/* NB You can't be holding gross_lock or deadlock will happen! */
+
+	return inode;
+}
+
+
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
+#define YCRED(x) x
+#else
+#define YCRED(x) (x->cred)
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,14,0)
+#define YPROC_uid(p) (YCRED(p)->fsuid)
+#define YPROC_gid(p) (YCRED(p)->fsgid)
+#define EXTRACT_gid(x) x
+#define EXTRACT_uid(x) x
+#define MAKE_gid(x) x
+#define MAKE_uid(x) x
+#else
+#define YPROC_uid(p) from_kuid(&init_user_ns, YCRED(p)->fsuid)
+#define YPROC_gid(p) from_kgid(&init_user_ns, YCRED(p)->fsgid)
+#define EXTRACT_gid(x) from_kgid(&init_user_ns, x)
+#define EXTRACT_uid(x) from_kuid(&init_user_ns, x)
+#define MAKE_gid(x) make_kgid(&init_user_ns, x)
+#define MAKE_uid(x) make_kuid(&init_user_ns, x)
+#endif
+
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
+		       dev_t rdev)
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+		       dev_t rdev)
+#else
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+		       int rdev)
+#endif
+{
+	struct inode *inode;
+
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_dev *dev;
+
+	struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
+
+	int error = -ENOSPC;
+	uid_t uid = YPROC_uid(current);
+	gid_t gid =
+	    (dir->i_mode & S_ISGID) ? EXTRACT_gid(dir->i_gid) : YPROC_gid(current);
+
+	if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
+		mode |= S_ISGID;
+
+	if (parent) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_mknod: parent object %d type %d",
+			parent->obj_id, parent->variant_type);
+	} else {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_mknod: could not get parent object");
+		return -EPERM;
+	}
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_mknod: making oject for %s, mode %x dev %x",
+		dentry->d_name.name, mode, rdev);
+
+	dev = parent->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	switch (mode & S_IFMT) {
+	default:
+		/* Special (socket, fifo, device...) */
+		yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special");
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+		obj =
+		    yaffs_create_special(parent, dentry->d_name.name, mode, uid,
+					 gid, old_encode_dev(rdev));
+#else
+		obj =
+		    yaffs_create_special(parent, dentry->d_name.name, mode, uid,
+					 gid, rdev);
+#endif
+		break;
+	case S_IFREG:		/* file          */
+		yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file");
+		obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
+					gid);
+		break;
+	case S_IFDIR:		/* directory */
+		yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory");
+		obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
+				       uid, gid);
+		break;
+	case S_IFLNK:		/* symlink */
+		yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink");
+		obj = NULL;	/* Do we ever get here? */
+		break;
+	}
+
+	/* Can not call yaffs_get_inode() with gross lock held */
+	yaffs_gross_unlock(dev);
+
+	if (obj) {
+		inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
+		d_instantiate(dentry, inode);
+		update_dir_time(dir);
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_mknod created object %d count = %d",
+			obj->obj_id, atomic_read(&inode->i_count));
+		error = 0;
+		yaffs_fill_inode_from_obj(dir, parent);
+	} else {
+		yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object");
+		error = -ENOMEM;
+	}
+
+	return error;
+}
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
+static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+#else
+static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+#endif
+{
+	int ret_val;
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_mkdir");
+	ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
+	return ret_val;
+}
+
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0))
+static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+			bool dummy)
+#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
+static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
+			struct nameidata *n)
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
+			struct nameidata *n)
+#else
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
+#endif
+{
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_create");
+	return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
+}
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0))
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
+				   unsigned int dummy)
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
+				   struct nameidata *n)
+#else
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
+#endif
+{
+	struct yaffs_obj *obj;
+	struct inode *inode = NULL;	/* NCB 2.5/2.6 needs NULL here */
+
+	struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
+
+	if (current != yaffs_dev_to_lc(dev)->readdir_process)
+		yaffs_gross_lock(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup for %d:%s",
+		yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
+
+	obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
+
+	obj = yaffs_get_equivalent_obj(obj);	/* in case it was a hardlink */
+
+	/* Can't hold gross lock when calling yaffs_get_inode() */
+	if (current != yaffs_dev_to_lc(dev)->readdir_process)
+		yaffs_gross_unlock(dev);
+
+	if (obj) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_lookup found %d", obj->obj_id);
+
+		inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
+	} else {
+		yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
+
+	}
+
+/* added NCB for 2.5/6 compatability - forces add even if inode is
+ * NULL which creates dentry hash */
+	d_add(dentry, inode);
+
+	return NULL;
+}
+
+/*
+ * Create a link...
+ */
+static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
+		      struct dentry *dentry)
+{
+	struct inode *inode = old_dentry->d_inode;
+	struct yaffs_obj *obj = NULL;
+	struct yaffs_obj *link = NULL;
+	struct yaffs_dev *dev;
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_link");
+
+	obj = yaffs_inode_to_obj(inode);
+	dev = obj->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	if (!S_ISDIR(inode->i_mode))	/* Don't link directories */
+		link =
+		    yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
+				   obj);
+
+	if (link) {
+		set_nlink(old_dentry->d_inode, yaffs_get_obj_link_count(obj));
+		d_instantiate(dentry, old_dentry->d_inode);
+		atomic_inc(&old_dentry->d_inode->i_count);
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_link link count %d i_count %d",
+			old_dentry->d_inode->i_nlink,
+			atomic_read(&old_dentry->d_inode->i_count));
+	}
+
+	yaffs_gross_unlock(dev);
+
+	if (link) {
+		update_dir_time(dir);
+		return 0;
+	}
+
+	return -EPERM;
+}
+
+static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
+			 const char *symname)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev;
+	uid_t uid = YPROC_uid(current);
+	gid_t gid =
+	    (dir->i_mode & S_ISGID) ? EXTRACT_gid(dir->i_gid) : YPROC_gid(current);
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink");
+
+	if (strnlen(dentry->d_name.name, YAFFS_MAX_NAME_LENGTH + 1) >
+				YAFFS_MAX_NAME_LENGTH)
+		return -ENAMETOOLONG;
+
+	if (strnlen(symname, YAFFS_MAX_ALIAS_LENGTH + 1) >
+				YAFFS_MAX_ALIAS_LENGTH)
+		return -ENAMETOOLONG;
+
+	dev = yaffs_inode_to_obj(dir)->my_dev;
+	yaffs_gross_lock(dev);
+	obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
+				   S_IFLNK | S_IRWXUGO, uid, gid, symname);
+	yaffs_gross_unlock(dev);
+
+	if (obj) {
+		struct inode *inode;
+
+		inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
+		d_instantiate(dentry, inode);
+		update_dir_time(dir);
+		yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
+		return 0;
+	} else {
+		yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
+	}
+
+	return -ENOMEM;
+}
+
+/*
+ * The VFS layer already does all the dentry stuff for rename.
+ *
+ * NB: POSIX says you can rename an object over an old object of the same name
+ */
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0))
+static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
+			struct inode *new_dir, struct dentry *new_dentry, unsigned int unused)
+#else
+static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
+			struct inode *new_dir, struct dentry *new_dentry)
+#endif
+{
+	struct yaffs_dev *dev;
+	int ret_val = YAFFS_FAIL;
+	struct yaffs_obj *target;
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
+	dev = yaffs_inode_to_obj(old_dir)->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	/* Check if the target is an existing directory that is not empty. */
+	target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
+				    new_dentry->d_name.name);
+
+	if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
+	    !list_empty(&target->variant.dir_variant.children)) {
+
+		yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
+
+		ret_val = YAFFS_FAIL;
+	} else {
+		/* Now does unlinking internally using shadowing mechanism */
+		yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
+
+		ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
+					   old_dentry->d_name.name,
+					   yaffs_inode_to_obj(new_dir),
+					   new_dentry->d_name.name);
+	}
+	yaffs_gross_unlock(dev);
+
+	if (ret_val == YAFFS_OK) {
+		if (target)
+			inode_dec_link_count(new_dentry->d_inode);
+
+		update_dir_time(old_dir);
+		if (old_dir != new_dir)
+			update_dir_time(new_dir);
+		return 0;
+	} else {
+		return -ENOTEMPTY;
+	}
+}
+
+
+
+
+static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
+{
+	int ret_val;
+
+	struct yaffs_dev *dev;
+	struct yaffs_obj *obj;
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_unlink %d:%s",
+		(int)(dir->i_ino), dentry->d_name.name);
+	obj = yaffs_inode_to_obj(dir);
+	dev = obj->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	ret_val = yaffs_unlinker(obj, dentry->d_name.name);
+
+	if (ret_val == YAFFS_OK) {
+		inode_dec_link_count(dentry->d_inode);
+		dir->i_version++;
+		yaffs_gross_unlock(dev);
+		update_dir_time(dir);
+		return 0;
+	}
+	yaffs_gross_unlock(dev);
+	return -ENOTEMPTY;
+}
+
+
+
+static const struct inode_operations yaffs_dir_inode_operations = {
+	.create = yaffs_create,
+	.lookup = yaffs_lookup,
+	.link = yaffs_link,
+	.unlink = yaffs_unlink,
+	.symlink = yaffs_symlink,
+	.mkdir = yaffs_mkdir,
+	.rmdir = yaffs_unlink,
+	.mknod = yaffs_mknod,
+	.rename = yaffs_rename,
+	.setattr = yaffs_setattr,
+	.listxattr = yaffs_listxattr,
+#ifdef YAFFS_USE_XATTR
+	.setxattr = yaffs_setxattr,
+	.getxattr = yaffs_getxattr,
+	.removexattr = yaffs_removexattr,
+#endif
+};
+
+/*-----------------------------------------------------------------*/
+/* Directory search context allows us to unlock access to yaffs during
+ * filldir without causing problems with the directory being modified.
+ * This is similar to the tried and tested mechanism used in yaffs direct.
+ *
+ * A search context iterates along a doubly linked list of siblings in the
+ * directory. If the iterating object is deleted then this would corrupt
+ * the list iteration, likely causing a crash. The search context avoids
+ * this by using the remove_obj_fn to move the search context to the
+ * next object before the object is deleted.
+ *
+ * Many readdirs (and thus seach conexts) may be alive simulateously so
+ * each struct yaffs_dev has a list of these.
+ *
+ * A seach context lives for the duration of a readdir.
+ *
+ * All these functions must be called while yaffs is locked.
+ */
+
+struct yaffs_search_context {
+	struct yaffs_dev *dev;
+	struct yaffs_obj *dir_obj;
+	struct yaffs_obj *next_return;
+	struct list_head others;
+};
+
+/*
+ * yaffs_new_search() creates a new search context, initialises it and
+ * adds it to the device's search context list.
+ *
+ * Called at start of readdir.
+ */
+static struct yaffs_search_context *yaffs_new_search(struct yaffs_obj *dir)
+{
+	struct yaffs_dev *dev = dir->my_dev;
+	struct yaffs_search_context *sc =
+	    kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
+	if (sc) {
+		sc->dir_obj = dir;
+		sc->dev = dev;
+		if (list_empty(&sc->dir_obj->variant.dir_variant.children))
+			sc->next_return = NULL;
+		else
+			sc->next_return =
+			    list_entry(dir->variant.dir_variant.children.next,
+				       struct yaffs_obj, siblings);
+		INIT_LIST_HEAD(&sc->others);
+		list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
+	}
+	return sc;
+}
+
+/*
+ * yaffs_search_end() disposes of a search context and cleans up.
+ */
+static void yaffs_search_end(struct yaffs_search_context *sc)
+{
+	if (sc) {
+		list_del(&sc->others);
+		kfree(sc);
+	}
+}
+
+/*
+ * yaffs_search_advance() moves a search context to the next object.
+ * Called when the search iterates or when an object removal causes
+ * the search context to be moved to the next object.
+ */
+static void yaffs_search_advance(struct yaffs_search_context *sc)
+{
+	if (!sc)
+		return;
+
+	if (sc->next_return == NULL ||
+	    list_empty(&sc->dir_obj->variant.dir_variant.children))
+		sc->next_return = NULL;
+	else {
+		struct list_head *next = sc->next_return->siblings.next;
+
+		if (next == &sc->dir_obj->variant.dir_variant.children)
+			sc->next_return = NULL;	/* end of list */
+		else
+			sc->next_return =
+			    list_entry(next, struct yaffs_obj, siblings);
+	}
+}
+
+/*
+ * yaffs_remove_obj_callback() is called when an object is unlinked.
+ * We check open search contexts and advance any which are currently
+ * on the object being iterated.
+ */
+static void yaffs_remove_obj_callback(struct yaffs_obj *obj)
+{
+
+	struct list_head *i;
+	struct yaffs_search_context *sc;
+	struct list_head *search_contexts =
+	    &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
+
+	/* Iterate through the directory search contexts.
+	 * If any are currently on the object being removed, then advance
+	 * the search context to the next object to prevent a hanging pointer.
+	 */
+	list_for_each(i, search_contexts) {
+		sc = list_entry(i, struct yaffs_search_context, others);
+		if (sc->next_return == obj)
+			yaffs_search_advance(sc);
+	}
+
+}
+
+
+/*-----------------------------------------------------------------*/
+
+#ifdef YAFFS_USE_DIR_ITERATE
+static int yaffs_iterate(struct file *f, struct dir_context *dc)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev;
+	struct yaffs_search_context *sc;
+	unsigned long curoffs;
+	struct yaffs_obj *l;
+	int ret_val = 0;
+
+	char name[YAFFS_MAX_NAME_LENGTH + 1];
+
+	obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
+	dev = obj->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	yaffs_dev_to_lc(dev)->readdir_process = current;
+
+	sc = yaffs_new_search(obj);
+	if (!sc) {
+		ret_val = -ENOMEM;
+		goto out;
+	}
+
+	if (!dir_emit_dots(f, dc))
+		return 0;
+
+	curoffs = 1;
+
+	while (sc->next_return) {
+		curoffs++;
+		l = sc->next_return;
+		if (curoffs >= dc->pos) {
+			int this_inode = yaffs_get_obj_inode(l);
+			int this_type = yaffs_get_obj_type(l);
+
+			yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
+			yaffs_trace(YAFFS_TRACE_OS,
+				"yaffs_readdir: %s inode %d",
+				name, yaffs_get_obj_inode(l));
+
+			yaffs_gross_unlock(dev);
+
+			if (!dir_emit(dc,
+				      name,
+				      strlen(name),
+				      this_inode,
+				      this_type)) {
+				yaffs_gross_lock(dev);
+				goto out;
+			}
+
+			yaffs_gross_lock(dev);
+
+			dc->pos++;
+			f->f_pos++;
+		}
+		yaffs_search_advance(sc);
+	}
+
+out:
+	yaffs_search_end(sc);
+	yaffs_dev_to_lc(dev)->readdir_process = NULL;
+	yaffs_gross_unlock(dev);
+
+	return ret_val;
+}
+
+#else
+
+static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev;
+	struct yaffs_search_context *sc;
+	struct inode *inode = Y_GET_DENTRY(f)->d_inode;
+	unsigned long offset, curoffs;
+	struct yaffs_obj *l;
+	int ret_val = 0;
+
+	char name[YAFFS_MAX_NAME_LENGTH + 1];
+
+	obj = yaffs_dentry_to_obj(Y_GET_DENTRY(f));
+	dev = obj->my_dev;
+
+	yaffs_gross_lock(dev);
+
+	yaffs_dev_to_lc(dev)->readdir_process = current;
+
+	offset = f->f_pos;
+
+	sc = yaffs_new_search(obj);
+	if (!sc) {
+		ret_val = -ENOMEM;
+		goto out;
+	}
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_readdir: starting at %d", (int)offset);
+
+	if (offset == 0) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_readdir: entry . ino %d",
+			(int)inode->i_ino);
+		yaffs_gross_unlock(dev);
+		if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
+			yaffs_gross_lock(dev);
+			goto out;
+		}
+		yaffs_gross_lock(dev);
+		offset++;
+		f->f_pos++;
+	}
+	if (offset == 1) {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_readdir: entry .. ino %d",
+			(int)f->f_dentry->d_parent->d_inode->i_ino);
+		yaffs_gross_unlock(dev);
+		if (filldir(dirent, "..", 2, offset,
+			    f->f_dentry->d_parent->d_inode->i_ino,
+			    DT_DIR) < 0) {
+			yaffs_gross_lock(dev);
+			goto out;
+		}
+		yaffs_gross_lock(dev);
+		offset++;
+		f->f_pos++;
+	}
+
+	curoffs = 1;
+
+	/* If the directory has changed since the open or last call to
+	   readdir, rewind to after the 2 canned entries. */
+	if (f->f_version != inode->i_version) {
+		offset = 2;
+		f->f_pos = offset;
+		f->f_version = inode->i_version;
+	}
+
+	while (sc->next_return) {
+		curoffs++;
+		l = sc->next_return;
+		if (curoffs >= offset) {
+			int this_inode = yaffs_get_obj_inode(l);
+			int this_type = yaffs_get_obj_type(l);
+
+			yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
+			yaffs_trace(YAFFS_TRACE_OS,
+				"yaffs_readdir: %s inode %d",
+				name, yaffs_get_obj_inode(l));
+
+			yaffs_gross_unlock(dev);
+
+			if (filldir(dirent,
+				    name,
+				    strlen(name),
+				    offset, this_inode, this_type) < 0) {
+				yaffs_gross_lock(dev);
+				goto out;
+			}
+
+			yaffs_gross_lock(dev);
+
+			offset++;
+			f->f_pos++;
+		}
+		yaffs_search_advance(sc);
+	}
+
+out:
+	yaffs_search_end(sc);
+	yaffs_dev_to_lc(dev)->readdir_process = NULL;
+	yaffs_gross_unlock(dev);
+
+	return ret_val;
+}
+
+#endif
+
+static const struct file_operations yaffs_dir_operations = {
+	.read = generic_read_dir,
+#ifdef YAFFS_USE_DIR_ITERATE
+	.iterate = yaffs_iterate,
+#else
+	.readdir = yaffs_readdir,
+#endif
+	.fsync = yaffs_sync_object,
+	.llseek = generic_file_llseek,
+};
+
+static void yaffs_fill_inode_from_obj(struct inode *inode,
+				      struct yaffs_obj *obj)
+{
+	if (inode && obj) {
+
+		/* Check mode against the variant type and attempt to repair if broken. */
+		u32 mode = obj->yst_mode;
+		switch (obj->variant_type) {
+		case YAFFS_OBJECT_TYPE_FILE:
+			if (!S_ISREG(mode)) {
+				obj->yst_mode &= ~S_IFMT;
+				obj->yst_mode |= S_IFREG;
+			}
+
+			break;
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			if (!S_ISLNK(mode)) {
+				obj->yst_mode &= ~S_IFMT;
+				obj->yst_mode |= S_IFLNK;
+			}
+
+			break;
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+			if (!S_ISDIR(mode)) {
+				obj->yst_mode &= ~S_IFMT;
+				obj->yst_mode |= S_IFDIR;
+			}
+
+			break;
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+		default:
+			/* TODO? */
+			break;
+		}
+
+		inode->i_flags |= S_NOATIME;
+
+		inode->i_ino = obj->obj_id;
+		inode->i_mode = obj->yst_mode;
+		inode->i_uid = MAKE_uid(obj->yst_uid);
+		inode->i_gid = MAKE_gid(obj->yst_gid);
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
+		inode->i_blksize = inode->i_sb->s_blocksize;
+#endif
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+
+		inode->i_rdev = old_decode_dev(obj->yst_rdev);
+		inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
+		inode->i_atime.tv_nsec = 0;
+		inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
+		inode->i_mtime.tv_nsec = 0;
+		inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
+		inode->i_ctime.tv_nsec = 0;
+#else
+		inode->i_rdev = obj->yst_rdev;
+		inode->i_atime = obj->yst_atime;
+		inode->i_mtime = obj->yst_mtime;
+		inode->i_ctime = obj->yst_ctime;
+#endif
+		inode->i_size = yaffs_get_obj_length(obj);
+		inode->i_blocks = (inode->i_size + 511) >> 9;
+
+		set_nlink(inode, yaffs_get_obj_link_count(obj));
+
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_fill_inode mode %x uid %d gid %d size %lld count %d",
+			inode->i_mode, obj->yst_uid, obj->yst_gid,
+			inode->i_size, atomic_read(&inode->i_count));
+
+		switch (obj->yst_mode & S_IFMT) {
+		default:	/* fifo, device or socket */
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+			init_special_inode(inode, obj->yst_mode,
+					   old_decode_dev(obj->yst_rdev));
+#else
+			init_special_inode(inode, obj->yst_mode,
+					   (dev_t) (obj->yst_rdev));
+#endif
+			break;
+		case S_IFREG:	/* file */
+			inode->i_op = &yaffs_file_inode_operations;
+			inode->i_fop = &yaffs_file_operations;
+			inode->i_mapping->a_ops =
+			    &yaffs_file_address_operations;
+			break;
+		case S_IFDIR:	/* directory */
+			inode->i_op = &yaffs_dir_inode_operations;
+			inode->i_fop = &yaffs_dir_operations;
+			break;
+		case S_IFLNK:	/* symlink */
+			inode->i_op = &yaffs_symlink_inode_operations;
+			break;
+		}
+
+		yaffs_inode_to_obj_lv(inode) = obj;
+
+		obj->my_inode = inode;
+
+	} else {
+		yaffs_trace(YAFFS_TRACE_OS,
+			"yaffs_fill_inode invalid parameters");
+	}
+
+}
+
+
+
+/*
+ * yaffs background thread functions .
+ * yaffs_bg_thread_fn() the thread function
+ * yaffs_bg_start() launches the background thread.
+ * yaffs_bg_stop() cleans up the background thread.
+ *
+ * NB:
+ * The thread should only run after the yaffs is initialised
+ * The thread should be stopped before yaffs is unmounted.
+ * The thread should not do any writing while the fs is in read only.
+ */
+
+static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
+{
+	unsigned erased_chunks =
+	    dev->n_erased_blocks * dev->param.chunks_per_block;
+	struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
+	unsigned scattered = 0;	/* Free chunks not in an erased block */
+
+	if (erased_chunks < dev->n_free_chunks)
+		scattered = (dev->n_free_chunks - erased_chunks);
+
+	if (!context->bg_running)
+		return 0;
+	else if (scattered < (dev->param.chunks_per_block * 2))
+		return 0;
+	else if (erased_chunks > dev->n_free_chunks / 2)
+		return 0;
+	else if (erased_chunks > dev->n_free_chunks / 4)
+		return 1;
+	else
+		return 2;
+}
+
+#ifdef YAFFS_COMPILE_BACKGROUND
+
+void yaffs_background_waker(unsigned long data)
+{
+	wake_up_process((struct task_struct *)data);
+}
+
+static int yaffs_bg_thread_fn(void *data)
+{
+	struct yaffs_dev *dev = (struct yaffs_dev *)data;
+	struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
+	unsigned long now = jiffies;
+	unsigned long next_dir_update = now;
+	unsigned long next_gc = now;
+	unsigned long expires;
+	unsigned int urgency;
+
+	int gc_result;
+	struct timer_list timer;
+
+	yaffs_trace(YAFFS_TRACE_BACKGROUND,
+		"yaffs_background starting for dev %p", (void *)dev);
+
+#ifdef YAFFS_COMPILE_FREEZER
+	set_freezable();
+#endif
+	while (context->bg_running) {
+		yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
+
+		if (kthread_should_stop())
+			break;
+
+#ifdef YAFFS_COMPILE_FREEZER
+		if (try_to_freeze())
+			continue;
+#endif
+		yaffs_gross_lock(dev);
+
+		now = jiffies;
+
+		if (time_after(now, next_dir_update) && yaffs_bg_enable) {
+			yaffs_update_dirty_dirs(dev);
+			next_dir_update = now + HZ;
+		}
+
+		if (time_after(now, next_gc) && yaffs_bg_enable) {
+			if (!dev->is_checkpointed) {
+				urgency = yaffs_bg_gc_urgency(dev);
+				gc_result = yaffs_bg_gc(dev, urgency);
+				if (urgency > 1)
+					next_gc = now + HZ / 20 + 1;
+				else if (urgency > 0)
+					next_gc = now + HZ / 10 + 1;
+				else
+					next_gc = now + HZ * 2;
+			} else	{
+			        /*
+				 * gc not running so set to next_dir_update
+				 * to cut down on wake ups
+				 */
+				next_gc = next_dir_update;
+                        }
+		}
+		yaffs_gross_unlock(dev);
+#if 1
+		expires = next_dir_update;
+		if (time_before(next_gc, expires))
+			expires = next_gc;
+		if (time_before(expires, now))
+			expires = now + HZ;
+
+		Y_INIT_TIMER(&timer);
+		timer.expires = expires + 1;
+		timer.data = (unsigned long)current;
+		timer.function = yaffs_background_waker;
+
+		set_current_state(TASK_INTERRUPTIBLE);
+		add_timer(&timer);
+		schedule();
+		del_timer_sync(&timer);
+#else
+		msleep(10);
+#endif
+	}
+
+	return 0;
+}
+
+static int yaffs_bg_start(struct yaffs_dev *dev)
+{
+	int retval = 0;
+	struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
+
+	if (dev->read_only)
+		return -1;
+
+	context->bg_running = 1;
+
+	context->bg_thread = kthread_run(yaffs_bg_thread_fn,
+					 (void *)dev, "yaffs-bg-%d",
+					 context->mount_id);
+
+	if (IS_ERR(context->bg_thread)) {
+		retval = PTR_ERR(context->bg_thread);
+		context->bg_thread = NULL;
+		context->bg_running = 0;
+	}
+	return retval;
+}
+
+static void yaffs_bg_stop(struct yaffs_dev *dev)
+{
+	struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
+
+	ctxt->bg_running = 0;
+
+	if (ctxt->bg_thread) {
+		kthread_stop(ctxt->bg_thread);
+		ctxt->bg_thread = NULL;
+	}
+}
+#else
+static int yaffs_bg_thread_fn(void *data)
+{
+	return 0;
+}
+
+static int yaffs_bg_start(struct yaffs_dev *dev)
+{
+	return 0;
+}
+
+static void yaffs_bg_stop(struct yaffs_dev *dev)
+{
+}
+#endif
+
+
+static void yaffs_flush_inodes(struct super_block *sb)
+{
+	struct inode *iptr;
+	struct yaffs_obj *obj;
+
+	list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
+		obj = yaffs_inode_to_obj(iptr);
+		if (obj) {
+			yaffs_trace(YAFFS_TRACE_OS,
+				"flushing obj %d",
+				obj->obj_id);
+			yaffs_flush_file(obj, 1, 0, 0);
+		}
+	}
+}
+
+static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
+{
+	struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+	if (!dev)
+		return;
+
+	yaffs_flush_inodes(sb);
+	yaffs_update_dirty_dirs(dev);
+	yaffs_flush_whole_cache(dev, 1);
+	if (do_checkpoint)
+		yaffs_checkpoint_save(dev);
+}
+
+static LIST_HEAD(yaffs_context_list);
+struct mutex yaffs_context_lock;
+
+static void yaffs_put_super(struct super_block *sb)
+{
+	struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+	struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS,
+			"yaffs_put_super");
+
+	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+		"Shutting down yaffs background thread");
+	yaffs_bg_stop(dev);
+	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+		"yaffs background thread shut down");
+
+	yaffs_gross_lock(dev);
+
+	yaffs_flush_super(sb, 1);
+
+	yaffs_deinitialise(dev);
+
+	yaffs_gross_unlock(dev);
+
+	mutex_lock(&yaffs_context_lock);
+	list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
+	mutex_unlock(&yaffs_context_lock);
+
+	if (yaffs_dev_to_lc(dev)->spare_buffer) {
+		kfree(yaffs_dev_to_lc(dev)->spare_buffer);
+		yaffs_dev_to_lc(dev)->spare_buffer = NULL;
+	}
+
+	kfree(dev);
+
+	yaffs_put_mtd_device(mtd);
+
+	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS,
+			"yaffs_put_super done");
+}
+
+
+static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
+{
+	return yaffs_gc_control;
+}
+
+
+#ifdef YAFFS_COMPILE_EXPORTFS
+
+static struct inode *yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino,
+					  uint32_t generation)
+{
+	return Y_IGET(sb, ino);
+}
+
+static struct dentry *yaffs2_fh_to_dentry(struct super_block *sb,
+					  struct fid *fid, int fh_len,
+					  int fh_type)
+{
+	return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
+				    yaffs2_nfs_get_inode);
+}
+
+static struct dentry *yaffs2_fh_to_parent(struct super_block *sb,
+					  struct fid *fid, int fh_len,
+					  int fh_type)
+{
+	return generic_fh_to_parent(sb, fid, fh_len, fh_type,
+				    yaffs2_nfs_get_inode);
+}
+
+struct dentry *yaffs2_get_parent(struct dentry *dentry)
+{
+
+	struct super_block *sb = dentry->d_inode->i_sb;
+	struct dentry *parent = ERR_PTR(-ENOENT);
+	struct inode *inode;
+	unsigned long parent_ino;
+	struct yaffs_obj *d_obj;
+	struct yaffs_obj *parent_obj;
+
+	d_obj = yaffs_inode_to_obj(dentry->d_inode);
+
+	if (d_obj) {
+		parent_obj = d_obj->parent;
+		if (parent_obj) {
+			parent_ino = yaffs_get_obj_inode(parent_obj);
+			inode = Y_IGET(sb, parent_ino);
+
+			if (IS_ERR(inode)) {
+				parent = ERR_CAST(inode);
+			} else {
+				parent = d_obtain_alias(inode);
+				if (!IS_ERR(parent)) {
+					parent = ERR_PTR(-ENOMEM);
+					iput(inode);
+				}
+			}
+		}
+	}
+
+	return parent;
+}
+
+/* Just declare a zero structure as a NULL value implies
+ * using the default functions of exportfs.
+ */
+
+static struct export_operations yaffs_export_ops = {
+	.fh_to_dentry = yaffs2_fh_to_dentry,
+	.fh_to_parent = yaffs2_fh_to_parent,
+	.get_parent = yaffs2_get_parent,
+};
+
+#endif
+
+static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
+{
+	/* Clear the association between the inode and
+	 * the struct yaffs_obj.
+	 */
+	obj->my_inode = NULL;
+	yaffs_inode_to_obj_lv(inode) = NULL;
+
+	/* If the object freeing was deferred, then the real
+	 * free happens now.
+	 * This should fix the inode inconsistency problem.
+	 */
+	yaffs_handle_defered_free(obj);
+}
+
+#ifdef YAFFS_HAS_EVICT_INODE
+/* yaffs_evict_inode combines into one operation what was previously done in
+ * yaffs_clear_inode() and yaffs_delete_inode()
+ *
+ */
+static void yaffs_evict_inode(struct inode *inode)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev;
+	int deleteme = 0;
+
+	obj = yaffs_inode_to_obj(inode);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_evict_inode: ino %d, count %d %s",
+		(int)inode->i_ino, atomic_read(&inode->i_count),
+		obj ? "object exists" : "null object");
+
+	if (!inode->i_nlink && !is_bad_inode(inode))
+		deleteme = 1;
+	truncate_inode_pages(&inode->i_data, 0);
+	Y_CLEAR_INODE(inode);
+
+	if (deleteme && obj) {
+		dev = obj->my_dev;
+		yaffs_gross_lock(dev);
+		yaffs_del_obj(obj);
+		yaffs_gross_unlock(dev);
+	}
+	if (obj) {
+		dev = obj->my_dev;
+		yaffs_gross_lock(dev);
+		yaffs_unstitch_obj(inode, obj);
+		yaffs_gross_unlock(dev);
+	}
+}
+#else
+
+/* clear is called to tell the fs to release any per-inode data it holds.
+ * The object might still exist on disk and is just being thrown out of the cache
+ * or else the object has actually been deleted and we're being called via
+ * the chain
+ *   yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode()
+ */
+
+static void yaffs_clear_inode(struct inode *inode)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_dev *dev;
+
+	obj = yaffs_inode_to_obj(inode);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_clear_inode: ino %d, count %d %s",
+		(int)inode->i_ino, atomic_read(&inode->i_count),
+		obj ? "object exists" : "null object");
+
+	if (obj) {
+		dev = obj->my_dev;
+		yaffs_gross_lock(dev);
+		yaffs_unstitch_obj(inode, obj);
+		yaffs_gross_unlock(dev);
+	}
+
+}
+
+/* delete is called when the link count is zero and the inode
+ * is put (ie. nobody wants to know about it anymore, time to
+ * delete the file).
+ * NB Must call clear_inode()
+ */
+static void yaffs_delete_inode(struct inode *inode)
+{
+	struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
+	struct yaffs_dev *dev;
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_delete_inode: ino %d, count %d %s",
+		(int)inode->i_ino, atomic_read(&inode->i_count),
+		obj ? "object exists" : "null object");
+
+	if (obj) {
+		dev = obj->my_dev;
+		yaffs_gross_lock(dev);
+		yaffs_del_obj(obj);
+		yaffs_gross_unlock(dev);
+	}
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
+	truncate_inode_pages(&inode->i_data, 0);
+#endif
+	clear_inode(inode);
+}
+#endif
+
+
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+	struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
+	struct super_block *sb = dentry->d_sb;
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+	struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+#else
+static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
+{
+	struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+#endif
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
+
+	yaffs_gross_lock(dev);
+
+	buf->f_type = YAFFS_MAGIC;
+	buf->f_bsize = sb->s_blocksize;
+	buf->f_namelen = 255;
+
+	if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
+		/* Do this if chunk size is not a power of 2 */
+
+		uint64_t bytes_in_dev;
+		uint64_t bytes_free;
+
+		bytes_in_dev =
+		    ((uint64_t)
+		     ((dev->param.end_block - dev->param.start_block +
+		       1))) * ((uint64_t) (dev->param.chunks_per_block *
+					   dev->data_bytes_per_chunk));
+
+		do_div(bytes_in_dev, sb->s_blocksize);	/* bytes_in_dev becomes the number of blocks */
+		buf->f_blocks = bytes_in_dev;
+
+		bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
+		    ((uint64_t) (dev->data_bytes_per_chunk));
+
+		do_div(bytes_free, sb->s_blocksize);
+
+		buf->f_bfree = bytes_free;
+
+	} else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
+
+		buf->f_blocks =
+		    (dev->param.end_block - dev->param.start_block + 1) *
+		    dev->param.chunks_per_block /
+		    (sb->s_blocksize / dev->data_bytes_per_chunk);
+		buf->f_bfree =
+		    yaffs_get_n_free_chunks(dev) /
+		    (sb->s_blocksize / dev->data_bytes_per_chunk);
+	} else {
+		buf->f_blocks =
+		    (dev->param.end_block - dev->param.start_block + 1) *
+		    dev->param.chunks_per_block *
+		    (dev->data_bytes_per_chunk / sb->s_blocksize);
+
+		buf->f_bfree =
+		    yaffs_get_n_free_chunks(dev) *
+		    (dev->data_bytes_per_chunk / sb->s_blocksize);
+	}
+
+	buf->f_files = 0;
+	buf->f_ffree = 0;
+	buf->f_bavail = buf->f_bfree;
+
+	yaffs_gross_unlock(dev);
+	return 0;
+}
+
+
+
+static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
+{
+
+	struct yaffs_dev *dev = yaffs_super_to_dev(sb);
+	unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
+	unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
+	int do_checkpoint;
+	int dirty = yaffs_check_super_dirty(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+		"yaffs_do_sync_fs: gc-urgency %d %s %s%s",
+		gc_urgent,
+		dirty ? "dirty" : "clean",
+		request_checkpoint ? "checkpoint requested" : "no checkpoint",
+		oneshot_checkpoint ? " one-shot" : "");
+
+	yaffs_gross_lock(dev);
+	do_checkpoint = ((request_checkpoint && !gc_urgent) ||
+			 oneshot_checkpoint) && !dev->is_checkpointed;
+
+	if (dirty || do_checkpoint) {
+		yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
+		yaffs_clear_super_dirty(dev);
+		if (oneshot_checkpoint)
+			yaffs_auto_checkpoint &= ~4;
+	}
+	yaffs_gross_unlock(dev);
+
+	return 0;
+}
+
+
+#ifdef YAFFS_HAS_WRITE_SUPER
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static void yaffs_write_super(struct super_block *sb)
+#else
+static int yaffs_write_super(struct super_block *sb)
+#endif
+{
+	unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
+
+	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+		"yaffs_write_super %s",
+		request_checkpoint ? " checkpt" : "");
+
+	yaffs_do_sync_fs(sb, request_checkpoint);
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
+	return 0;
+#endif
+}
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_sync_fs(struct super_block *sb, int wait)
+#else
+static int yaffs_sync_fs(struct super_block *sb)
+#endif
+{
+	unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
+
+	yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
+		"yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
+
+	yaffs_do_sync_fs(sb, request_checkpoint);
+
+	return 0;
+}
+
+/* the function only is used to change dev->read_only when this file system
+ * is remounted.
+ */
+static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+	int read_only = 0;
+	struct mtd_info *mtd;
+	struct yaffs_dev *dev = 0;
+
+	/* Get the device */
+	mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
+	if (!mtd) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"MTD device #%u doesn't appear to exist",
+			MINOR(sb->s_dev));
+		return 1;
+	}
+
+	/* Check it's NAND */
+	if (mtd->type != MTD_NANDFLASH) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"MTD device is not NAND it's type %d",
+			mtd->type);
+		return 1;
+	}
+
+	read_only = ((*flags & MS_RDONLY) != 0);
+	if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
+		read_only = 1;
+		printk(KERN_INFO
+			"yaffs: mtd is read only, setting superblock read only");
+		*flags |= MS_RDONLY;
+	}
+
+	dev = sb->s_fs_info;
+	dev->read_only = read_only;
+
+	return 0;
+}
+
+static const struct super_operations yaffs_super_ops = {
+	.statfs = yaffs_statfs,
+
+#ifndef YAFFS_USE_OWN_IGET
+	.read_inode = yaffs_read_inode,
+#endif
+#ifdef YAFFS_HAS_PUT_INODE
+	.put_inode = yaffs_put_inode,
+#endif
+	.put_super = yaffs_put_super,
+#ifdef YAFFS_HAS_EVICT_INODE
+	.evict_inode = yaffs_evict_inode,
+#else
+	.delete_inode = yaffs_delete_inode,
+	.clear_inode = yaffs_clear_inode,
+#endif
+	.sync_fs = yaffs_sync_fs,
+#ifdef YAFFS_HAS_WRITE_SUPER
+	.write_super = yaffs_write_super,
+#endif
+	.remount_fs = yaffs_remount_fs,
+};
+
+struct yaffs_options {
+	int inband_tags;
+	int skip_checkpoint_read;
+	int skip_checkpoint_write;
+	int no_cache;
+	int tags_ecc_on;
+	int tags_ecc_overridden;
+	int lazy_loading_enabled;
+	int lazy_loading_overridden;
+	int empty_lost_and_found;
+	int empty_lost_and_found_overridden;
+	int disable_summary;
+};
+
+#define MAX_OPT_LEN 30
+static int yaffs_parse_options(struct yaffs_options *options,
+			       const char *options_str)
+{
+	char cur_opt[MAX_OPT_LEN + 1];
+	int p;
+	int error = 0;
+
+	/* Parse through the options which is a comma seperated list */
+
+	while (options_str && *options_str && !error) {
+		memset(cur_opt, 0, MAX_OPT_LEN + 1);
+		p = 0;
+
+		while (*options_str == ',')
+			options_str++;
+
+		while (*options_str && *options_str != ',') {
+			if (p < MAX_OPT_LEN) {
+				cur_opt[p] = *options_str;
+				p++;
+			}
+			options_str++;
+		}
+
+		if (!strcmp(cur_opt, "inband-tags")) {
+			options->inband_tags = 1;
+		} else if (!strcmp(cur_opt, "tags-ecc-off")) {
+			options->tags_ecc_on = 0;
+			options->tags_ecc_overridden = 1;
+		} else if (!strcmp(cur_opt, "tags-ecc-on")) {
+			options->tags_ecc_on = 1;
+			options->tags_ecc_overridden = 1;
+		} else if (!strcmp(cur_opt, "lazy-loading-off")) {
+			options->lazy_loading_enabled = 0;
+			options->lazy_loading_overridden = 1;
+		} else if (!strcmp(cur_opt, "lazy-loading-on")) {
+			options->lazy_loading_enabled = 1;
+			options->lazy_loading_overridden = 1;
+		} else if (!strcmp(cur_opt, "disable-summary")) {
+			options->disable_summary = 1;
+		} else if (!strcmp(cur_opt, "empty-lost-and-found-off")) {
+			options->empty_lost_and_found = 0;
+			options->empty_lost_and_found_overridden = 1;
+		} else if (!strcmp(cur_opt, "empty-lost-and-found-on")) {
+			options->empty_lost_and_found = 1;
+			options->empty_lost_and_found_overridden = 1;
+		} else if (!strcmp(cur_opt, "no-cache")) {
+			options->no_cache = 1;
+		} else if (!strcmp(cur_opt, "no-checkpoint-read")) {
+			options->skip_checkpoint_read = 1;
+		} else if (!strcmp(cur_opt, "no-checkpoint-write")) {
+			options->skip_checkpoint_write = 1;
+		} else if (!strcmp(cur_opt, "no-checkpoint")) {
+			options->skip_checkpoint_read = 1;
+			options->skip_checkpoint_write = 1;
+		} else {
+			printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
+			       cur_opt);
+			error = 1;
+		}
+	}
+
+	return error;
+}
+
+
+static struct dentry *yaffs_make_root(struct inode *inode)
+{
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0))
+	struct dentry *root = d_alloc_root(inode);
+
+	if (!root)
+		iput(inode);
+
+        return root;
+#else
+        return d_make_root(inode);
+#endif
+}
+
+
+
+
+static struct super_block *yaffs_internal_read_super(int yaffs_version,
+						     struct super_block *sb,
+						     void *data, int silent)
+{
+	int n_blocks;
+	struct inode *inode = NULL;
+	struct dentry *root;
+	struct yaffs_dev *dev = 0;
+	char devname_buf[BDEVNAME_SIZE + 1];
+	struct mtd_info *mtd;
+	int err;
+	char *data_str = (char *)data;
+	struct yaffs_linux_context *context = NULL;
+	struct yaffs_param *param;
+
+	int read_only = 0;
+	int inband_tags = 0;
+
+	struct yaffs_options options;
+
+	unsigned mount_id;
+	int found;
+	struct yaffs_linux_context *context_iterator;
+	struct list_head *l;
+
+	if (!sb) {
+		printk(KERN_INFO "yaffs: sb is NULL\n");
+		return NULL;
+        }
+
+	sb->s_magic = YAFFS_MAGIC;
+	sb->s_op = &yaffs_super_ops;
+	sb->s_flags |= MS_NOATIME;
+
+	read_only = ((sb->s_flags & MS_RDONLY) != 0);
+
+#ifdef YAFFS_COMPILE_EXPORTFS
+	sb->s_export_op = &yaffs_export_ops;
+#endif
+
+	if (!sb->s_dev)
+		printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
+	else if (!yaffs_devname(sb, devname_buf))
+		printk(KERN_INFO "yaffs: devname is NULL\n");
+	else
+		printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
+		       sb->s_dev,
+		       yaffs_devname(sb, devname_buf), read_only ? "ro" : "rw");
+
+	if (!data_str)
+		data_str = "";
+
+	printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
+
+	memset(&options, 0, sizeof(options));
+
+	if (yaffs_parse_options(&options, data_str)) {
+		/* Option parsing failed */
+		return NULL;
+	}
+
+	sb->s_blocksize = PAGE_CACHE_SIZE;
+	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_read_super: Using yaffs%d", yaffs_version);
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_read_super: block size %d", (int)(sb->s_blocksize));
+
+	yaffs_trace(YAFFS_TRACE_ALWAYS,
+		"yaffs: Attempting MTD mount of %u.%u,\"%s\"",
+		MAJOR(sb->s_dev), MINOR(sb->s_dev),
+		yaffs_devname(sb, devname_buf));
+
+	/* Get the device */
+	mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
+	if (IS_ERR(mtd)) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"yaffs: MTD device %u either not valid or unavailable",
+			MINOR(sb->s_dev));
+		return NULL;
+	}
+
+	if (yaffs_auto_select && yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
+		yaffs_version = 2;
+	}
+
+	/* Added NCB 26/5/2006 for completeness */
+	if (yaffs_version == 2 && !options.inband_tags
+	    && WRITE_SIZE(mtd) == 512) {
+		yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
+		yaffs_version = 1;
+	}
+
+	if (mtd->oobavail < sizeof(struct yaffs_packed_tags2) ||
+	    options.inband_tags)
+		inband_tags = 1;
+
+	if(yaffs_verify_mtd(mtd, yaffs_version, inband_tags) < 0)
+		return NULL;
+
+	/* OK, so if we got here, we have an MTD that's NAND and looks
+	 * like it has the right capabilities
+	 * Set the struct yaffs_dev up for mtd
+	 */
+
+	if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
+		read_only = 1;
+		printk(KERN_INFO
+		       "yaffs: mtd is read only, setting superblock read only\n"
+		);
+		sb->s_flags |= MS_RDONLY;
+	}
+
+	dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
+	context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
+
+	if (!dev || !context) {
+		kfree(dev);
+		kfree(context);
+		dev = NULL;
+		context = NULL;
+
+		/* Deep shit could not allocate device structure */
+		yaffs_trace(YAFFS_TRACE_ALWAYS,
+			"yaffs_read_super: Failed trying to allocate struct yaffs_dev."
+		);
+		return NULL;
+	}
+	memset(dev, 0, sizeof(struct yaffs_dev));
+	param = &(dev->param);
+
+	memset(context, 0, sizeof(struct yaffs_linux_context));
+	dev->os_context = context;
+	INIT_LIST_HEAD(&(context->context_list));
+	context->dev = dev;
+	context->super = sb;
+
+	dev->read_only = read_only;
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+	sb->s_fs_info = dev;
+#else
+	sb->u.generic_sbp = dev;
+#endif
+
+
+	dev->driver_context = mtd;
+	param->name = mtd->name;
+
+	/* Set up the memory size parameters.... */
+
+
+	param->n_reserved_blocks = 5;
+	param->n_caches = (options.no_cache) ? 0 : 10;
+	param->inband_tags = inband_tags;
+
+	param->enable_xattr = 1;
+	if (options.lazy_loading_overridden)
+		param->disable_lazy_load = !options.lazy_loading_enabled;
+
+	param->defered_dir_update = 1;
+
+	if (options.tags_ecc_overridden)
+		param->no_tags_ecc = !options.tags_ecc_on;
+
+	param->empty_lost_n_found = 1;
+	param->refresh_period = 500;
+	param->disable_summary = options.disable_summary;
+
+
+#ifdef CONFIG_YAFFS_DISABLE_BAD_BLOCK_MARKING
+	param->disable_bad_block_marking  = 1;
+#endif
+	if (options.empty_lost_and_found_overridden)
+		param->empty_lost_n_found = options.empty_lost_and_found;
+
+	/* ... and the functions. */
+	if (yaffs_version == 2) {
+		param->is_yaffs2 = 1;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+		param->total_bytes_per_chunk = mtd->writesize;
+		param->chunks_per_block = mtd->erasesize / mtd->writesize;
+#else
+		param->total_bytes_per_chunk = mtd->oobblock;
+		param->chunks_per_block = mtd->erasesize / mtd->oobblock;
+#endif
+		n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
+
+		param->start_block = 0;
+		param->end_block = n_blocks - 1;
+	} else {
+		param->is_yaffs2 = 0;
+		n_blocks = YCALCBLOCKS(mtd->size,
+			     YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
+
+		param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
+		param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
+	}
+
+	param->start_block = 0;
+	param->end_block = n_blocks - 1;
+
+	yaffs_mtd_drv_install(dev);
+
+	param->sb_dirty_fn = yaffs_set_super_dirty;
+	param->gc_control_fn = yaffs_gc_control_callback;
+
+	yaffs_dev_to_lc(dev)->super = sb;
+
+	param->use_nand_ecc = 1;
+
+	param->skip_checkpt_rd = options.skip_checkpoint_read;
+	param->skip_checkpt_wr = options.skip_checkpoint_write;
+
+	mutex_lock(&yaffs_context_lock);
+	/* Get a mount id */
+	found = 0;
+	for (mount_id = 0; !found; mount_id++) {
+		found = 1;
+		list_for_each(l, &yaffs_context_list) {
+			context_iterator =
+			    list_entry(l, struct yaffs_linux_context,
+				       context_list);
+			if (context_iterator->mount_id == mount_id)
+				found = 0;
+		}
+	}
+	context->mount_id = mount_id;
+
+	list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
+		      &yaffs_context_list);
+	mutex_unlock(&yaffs_context_lock);
+
+	/* Directory search handling... */
+	INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
+	param->remove_obj_fn = yaffs_remove_obj_callback;
+
+	mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
+
+	yaffs_gross_lock(dev);
+
+	err = yaffs_guts_initialise(dev);
+
+	yaffs_trace(YAFFS_TRACE_OS,
+		"yaffs_read_super: guts initialised %s",
+		(err == YAFFS_OK) ? "OK" : "FAILED");
+
+	if (err == YAFFS_OK)
+		yaffs_bg_start(dev);
+
+	if (!context->bg_thread)
+		param->defered_dir_update = 0;
+
+	sb->s_maxbytes = yaffs_max_file_size(dev);
+
+	/* Release lock before yaffs_get_inode() */
+	yaffs_gross_unlock(dev);
+
+	/* Create root inode */
+	if (err == YAFFS_OK)
+		inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0, yaffs_root(dev));
+
+	if (!inode)
+		return NULL;
+
+	inode->i_op = &yaffs_dir_inode_operations;
+	inode->i_fop = &yaffs_dir_operations;
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
+
+	root = yaffs_make_root(inode);
+
+	if (!root)
+		return NULL;
+
+	sb->s_root = root;
+	if(!dev->is_checkpointed)
+		yaffs_set_super_dirty(dev);
+
+	yaffs_trace(YAFFS_TRACE_ALWAYS,
+		"yaffs_read_super: is_checkpointed %d",
+		dev->is_checkpointed);
+
+	yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
+	return sb;
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
+					 int silent)
+{
+	return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
+}
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
+static struct dentry *yaffs_mount(struct file_system_type *fs_type, int flags,
+        const char *dev_name, void *data)
+{
+    return mount_bdev(fs_type, flags, dev_name, data, yaffs_internal_read_super_mtd);
+}
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_read_super(struct file_system_type *fs,
+			    int flags, const char *dev_name,
+			    void *data, struct vfsmount *mnt)
+{
+
+	return get_sb_bdev(fs, flags, dev_name, data,
+			   yaffs_internal_read_super_mtd, mnt);
+}
+#else
+static struct super_block *yaffs_read_super(struct file_system_type *fs,
+					    int flags, const char *dev_name,
+					    void *data)
+{
+
+	return get_sb_bdev(fs, flags, dev_name, data,
+			   yaffs_internal_read_super_mtd);
+}
+#endif
+
+static struct file_system_type yaffs_fs_type = {
+	.owner = THIS_MODULE,
+	.name = "yaffs",
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
+        .mount = yaffs_mount,
+#else
+        .get_sb = yaffs_read_super,
+#endif
+     	.kill_sb = kill_block_super,
+	.fs_flags = FS_REQUIRES_DEV,
+};
+#else
+static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
+					    int silent)
+{
+	return yaffs_internal_read_super(1, sb, data, silent);
+}
+
+static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
+		      FS_REQUIRES_DEV);
+#endif
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
+					  int silent)
+{
+	return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
+}
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
+static struct dentry *yaffs2_mount(struct file_system_type *fs_type, int flags,
+        const char *dev_name, void *data)
+{
+        return mount_bdev(fs_type, flags, dev_name, data, yaffs2_internal_read_super_mtd);
+}
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs2_read_super(struct file_system_type *fs,
+			     int flags, const char *dev_name, void *data,
+			     struct vfsmount *mnt)
+{
+	return get_sb_bdev(fs, flags, dev_name, data,
+			   yaffs2_internal_read_super_mtd, mnt);
+}
+#else
+static struct super_block *yaffs2_read_super(struct file_system_type *fs,
+					     int flags, const char *dev_name,
+					     void *data)
+{
+
+	return get_sb_bdev(fs, flags, dev_name, data,
+			   yaffs2_internal_read_super_mtd);
+}
+#endif
+
+static struct file_system_type yaffs2_fs_type = {
+	.owner = THIS_MODULE,
+	.name = "yaffs2",
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
+        .mount = yaffs2_mount,
+#else
+        .get_sb = yaffs2_read_super,
+#endif
+     	.kill_sb = kill_block_super,
+	.fs_flags = FS_REQUIRES_DEV,
+};
+#else
+static struct super_block *yaffs2_read_super(struct super_block *sb,
+					     void *data, int silent)
+{
+	return yaffs_internal_read_super(2, sb, data, silent);
+}
+
+static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
+		      FS_REQUIRES_DEV);
+#endif
+
+
+static struct proc_dir_entry *my_proc_entry;
+
+static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
+{
+	struct yaffs_param *param = &dev->param;
+	int bs[10];
+
+	yaffs_count_blocks_by_state(dev,bs);
+
+	buf += sprintf(buf, "start_block.......... %d\n", param->start_block);
+	buf += sprintf(buf, "end_block............ %d\n", param->end_block);
+	buf += sprintf(buf, "total_bytes_per_chunk %d\n",
+				param->total_bytes_per_chunk);
+	buf += sprintf(buf, "use_nand_ecc......... %d\n", param->use_nand_ecc);
+	buf += sprintf(buf, "no_tags_ecc.......... %d\n", param->no_tags_ecc);
+	buf += sprintf(buf, "is_yaffs2............ %d\n", param->is_yaffs2);
+	buf += sprintf(buf, "inband_tags.......... %d\n", param->inband_tags);
+	buf += sprintf(buf, "empty_lost_n_found... %d\n",
+				param->empty_lost_n_found);
+	buf += sprintf(buf, "disable_lazy_load.... %d\n",
+				param->disable_lazy_load);
+	buf += sprintf(buf, "disable_bad_block_mrk %d\n",
+				param->disable_bad_block_marking);
+	buf += sprintf(buf, "refresh_period....... %d\n",
+				param->refresh_period);
+	buf += sprintf(buf, "n_caches............. %d\n", param->n_caches);
+	buf += sprintf(buf, "n_reserved_blocks.... %d\n",
+				param->n_reserved_blocks);
+	buf += sprintf(buf, "always_check_erased.. %d\n",
+				param->always_check_erased);
+	buf += sprintf(buf, "\n");
+	buf += sprintf(buf, "block count by state\n");
+	buf += sprintf(buf, "0:%d 1:%d 2:%d 3:%d 4:%d\n",
+				bs[0], bs[1], bs[2], bs[3], bs[4]);
+	buf += sprintf(buf, "5:%d 6:%d 7:%d 8:%d 9:%d\n",
+				bs[5], bs[6], bs[7], bs[8], bs[9]);
+
+	return buf;
+}
+
+static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
+{
+	buf += sprintf(buf, "max file size....... %lld\n",
+				(long long) yaffs_max_file_size(dev));
+	buf += sprintf(buf, "data_bytes_per_chunk. %d\n",
+				dev->data_bytes_per_chunk);
+	buf += sprintf(buf, "chunk_grp_bits....... %d\n", dev->chunk_grp_bits);
+	buf += sprintf(buf, "chunk_grp_size....... %d\n", dev->chunk_grp_size);
+	buf += sprintf(buf, "n_erased_blocks...... %d\n", dev->n_erased_blocks);
+	buf += sprintf(buf, "blocks_in_checkpt.... %d\n",
+				dev->blocks_in_checkpt);
+	buf += sprintf(buf, "\n");
+	buf += sprintf(buf, "n_tnodes............. %d\n", dev->n_tnodes);
+	buf += sprintf(buf, "n_obj................ %d\n", dev->n_obj);
+	buf += sprintf(buf, "n_free_chunks........ %d\n", dev->n_free_chunks);
+	buf += sprintf(buf, "\n");
+	buf += sprintf(buf, "n_page_writes........ %u\n", dev->n_page_writes);
+	buf += sprintf(buf, "n_page_reads......... %u\n", dev->n_page_reads);
+	buf += sprintf(buf, "n_erasures........... %u\n", dev->n_erasures);
+	buf += sprintf(buf, "n_gc_copies.......... %u\n", dev->n_gc_copies);
+	buf += sprintf(buf, "all_gcs.............. %u\n", dev->all_gcs);
+	buf += sprintf(buf, "passive_gc_count..... %u\n",
+				dev->passive_gc_count);
+	buf += sprintf(buf, "oldest_dirty_gc_count %u\n",
+				dev->oldest_dirty_gc_count);
+	buf += sprintf(buf, "n_gc_blocks.......... %u\n", dev->n_gc_blocks);
+	buf += sprintf(buf, "bg_gcs............... %u\n", dev->bg_gcs);
+	buf += sprintf(buf, "n_retried_writes..... %u\n",
+				dev->n_retried_writes);
+	buf += sprintf(buf, "n_retired_blocks..... %u\n",
+				dev->n_retired_blocks);
+	buf += sprintf(buf, "n_ecc_fixed.......... %u\n", dev->n_ecc_fixed);
+	buf += sprintf(buf, "n_ecc_unfixed........ %u\n", dev->n_ecc_unfixed);
+	buf += sprintf(buf, "n_tags_ecc_fixed..... %u\n",
+				dev->n_tags_ecc_fixed);
+	buf += sprintf(buf, "n_tags_ecc_unfixed... %u\n",
+				dev->n_tags_ecc_unfixed);
+	buf += sprintf(buf, "cache_hits........... %u\n", dev->cache_hits);
+	buf += sprintf(buf, "n_deleted_files...... %u\n", dev->n_deleted_files);
+	buf += sprintf(buf, "n_unlinked_files..... %u\n",
+				dev->n_unlinked_files);
+	buf += sprintf(buf, "refresh_count........ %u\n", dev->refresh_count);
+	buf += sprintf(buf, "n_bg_deletions....... %u\n", dev->n_bg_deletions);
+	buf += sprintf(buf, "tags_used............ %u\n", dev->tags_used);
+	buf += sprintf(buf, "summary_used......... %u\n", dev->summary_used);
+
+	return buf;
+}
+
+static int yaffs_proc_read(char *page,
+			   char **start,
+			   off_t offset, int count, int *eof, void *data)
+{
+	struct list_head *item;
+	char *buf = page;
+	int step = offset;
+	int n = 0;
+
+	/* Get proc_file_read() to step 'offset' by one on each sucessive call.
+	 * We use 'offset' (*ppos) to indicate where we are in dev_list.
+	 * This also assumes the user has posted a read buffer large
+	 * enough to hold the complete output; but that's life in /proc.
+	 */
+
+	*(int *)start = 1;
+
+	/* Print header first */
+	if (step == 0)
+		buf +=
+		    sprintf(buf, "Multi-version YAFFS\n");
+	else if (step == 1)
+		buf += sprintf(buf, "\n");
+	else {
+		step -= 2;
+
+		mutex_lock(&yaffs_context_lock);
+
+		/* Locate and print the Nth entry.  Order N-squared but N is small. */
+		list_for_each(item, &yaffs_context_list) {
+			struct yaffs_linux_context *dc =
+			    list_entry(item, struct yaffs_linux_context,
+				       context_list);
+			struct yaffs_dev *dev = dc->dev;
+
+			if (n < (step & ~1)) {
+				n += 2;
+				continue;
+			}
+			if ((step & 1) == 0) {
+				buf +=
+				    sprintf(buf, "\nDevice %d \"%s\"\n", n,
+					    dev->param.name);
+				buf = yaffs_dump_dev_part0(buf, dev);
+			} else {
+				buf = yaffs_dump_dev_part1(buf, dev);
+                        }
+
+			break;
+		}
+		mutex_unlock(&yaffs_context_lock);
+	}
+
+	return buf - page < count ? buf - page : count;
+}
+
+/**
+ * Set the verbosity of the warnings and error messages.
+ *
+ * Note that the names can only be a..z or _ with the current code.
+ */
+
+static struct {
+	char *mask_name;
+	unsigned mask_bitfield;
+} mask_flags[] = {
+	{"allocate", YAFFS_TRACE_ALLOCATE},
+	{"always", YAFFS_TRACE_ALWAYS},
+	{"background", YAFFS_TRACE_BACKGROUND},
+	{"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
+	{"buffers", YAFFS_TRACE_BUFFERS},
+	{"bug", YAFFS_TRACE_BUG},
+	{"checkpt", YAFFS_TRACE_CHECKPOINT},
+	{"deletion", YAFFS_TRACE_DELETION},
+	{"erase", YAFFS_TRACE_ERASE},
+	{"error", YAFFS_TRACE_ERROR},
+	{"gc_detail", YAFFS_TRACE_GC_DETAIL},
+	{"gc", YAFFS_TRACE_GC},
+	{"lock", YAFFS_TRACE_LOCK},
+	{"mtd", YAFFS_TRACE_MTD},
+	{"nandaccess", YAFFS_TRACE_NANDACCESS},
+	{"os", YAFFS_TRACE_OS},
+	{"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
+	{"scan", YAFFS_TRACE_SCAN},
+	{"mount", YAFFS_TRACE_MOUNT},
+	{"tracing", YAFFS_TRACE_TRACING},
+	{"sync", YAFFS_TRACE_SYNC},
+	{"write", YAFFS_TRACE_WRITE},
+	{"verify", YAFFS_TRACE_VERIFY},
+	{"verify_nand", YAFFS_TRACE_VERIFY_NAND},
+	{"verify_full", YAFFS_TRACE_VERIFY_FULL},
+	{"verify_all", YAFFS_TRACE_VERIFY_ALL},
+	{"all", 0xffffffff},
+	{"none", 0},
+	{NULL, 0},
+};
+
+#define MAX_MASK_NAME_LENGTH 40
+static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
+					  unsigned long count)
+{
+	unsigned rg = 0, mask_bitfield;
+	char *end;
+	char *mask_name;
+	const char *x;
+	char substring[MAX_MASK_NAME_LENGTH + 1];
+	int i;
+	int done = 0;
+	int add, len = 0;
+	int pos = 0;
+
+	rg = yaffs_trace_mask;
+
+	while (!done && (pos < count)) {
+		done = 1;
+		while ((pos < count) && isspace(buf[pos]))
+			pos++;
+
+		switch (buf[pos]) {
+		case '+':
+		case '-':
+		case '=':
+			add = buf[pos];
+			pos++;
+			break;
+
+		default:
+			add = ' ';
+			break;
+		}
+		mask_name = NULL;
+
+		mask_bitfield = simple_strtoul(buf + pos, &end, 0);
+
+		if (end > buf + pos) {
+			mask_name = "numeral";
+			len = end - (buf + pos);
+			pos += len;
+			done = 0;
+		} else {
+			for (x = buf + pos, i = 0;
+			     (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
+			     i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
+				substring[i] = *x;
+			substring[i] = '\0';
+
+			for (i = 0; mask_flags[i].mask_name != NULL; i++) {
+				if (strcmp(substring, mask_flags[i].mask_name)
+				    == 0) {
+					mask_name = mask_flags[i].mask_name;
+					mask_bitfield =
+					    mask_flags[i].mask_bitfield;
+					done = 0;
+					break;
+				}
+			}
+		}
+
+		if (mask_name != NULL) {
+			done = 0;
+			switch (add) {
+			case '-':
+				rg &= ~mask_bitfield;
+				break;
+			case '+':
+				rg |= mask_bitfield;
+				break;
+			case '=':
+				rg = mask_bitfield;
+				break;
+			default:
+				rg |= mask_bitfield;
+				break;
+			}
+		}
+	}
+
+	yaffs_trace_mask = rg | YAFFS_TRACE_ALWAYS;
+
+	printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
+
+	if (rg & YAFFS_TRACE_ALWAYS) {
+		for (i = 0; mask_flags[i].mask_name != NULL; i++) {
+			char flag;
+			flag = ((rg & mask_flags[i].mask_bitfield) ==
+				mask_flags[i].mask_bitfield) ? '+' : '-';
+			printk(KERN_DEBUG "%c%s\n", flag,
+			       mask_flags[i].mask_name);
+		}
+	}
+
+	return count;
+}
+
+/* Debug strings are of the form:
+ * .bnnn         print info on block n
+ * .cobjn,chunkn print nand chunk id for objn:chunkn
+ */
+
+static int yaffs_proc_debug_write(struct file *file, const char *buf,
+					  unsigned long count)
+{
+
+	char str[100];
+	char *p0;
+	char *p1;
+	long p1_val;
+	long p0_val;
+	char cmd;
+	struct list_head *item;
+
+	memset(str, 0, sizeof(str));
+	memcpy(str, buf, min((size_t)count, sizeof(str) -1));
+
+	cmd = str[1];
+
+	p0 = str + 2;
+
+	p1 = p0;
+
+	while (*p1 && *p1 != ',') {
+		p1++;
+	}
+	*p1 = '\0';
+	p1++;
+
+	p0_val = simple_strtol(p0, NULL, 0);
+	p1_val = simple_strtol(p1, NULL, 0);
+
+
+	mutex_lock(&yaffs_context_lock);
+
+	/* Locate and print the Nth entry.  Order N-squared but N is small. */
+	list_for_each(item, &yaffs_context_list) {
+		struct yaffs_linux_context *dc =
+		    list_entry(item, struct yaffs_linux_context,
+			       context_list);
+		struct yaffs_dev *dev = dc->dev;
+
+		if (cmd == 'b') {
+			struct yaffs_block_info *bi;
+
+			bi = yaffs_get_block_info(dev,p0_val);
+
+			if(bi) {
+				printk("Block %d: state %d, retire %d, use %d, seq %d\n",
+					(int)p0_val, bi->block_state,
+					bi->needs_retiring, bi->pages_in_use,
+					bi->seq_number);
+			}
+		} else if (cmd == 'c') {
+			struct yaffs_obj *obj;
+			int nand_chunk;
+
+			obj = yaffs_find_by_number(dev, p0_val);
+			if (!obj)
+				printk("No obj %d\n", (int)p0_val);
+			else {
+				if(p1_val == 0)
+					nand_chunk = obj->hdr_chunk;
+				else
+					nand_chunk =
+						yaffs_find_chunk_in_file(obj,
+							p1_val, NULL);
+				printk("Nand chunk for %d:%d is %d\n",
+					(int)p0_val, (int)p1_val, nand_chunk);
+			}
+		}
+	}
+
+	mutex_unlock(&yaffs_context_lock);
+
+	return count;
+}
+
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0))
+static int yaffs_proc_write(struct file *file, const char *buf,
+			    unsigned long count, void *ppos)
+#else
+static ssize_t yaffs_proc_write(struct file *file, const char __user *buf,
+			    size_t count, loff_t *ppos)
+#endif
+{
+	if (buf[0] == '.')
+		return yaffs_proc_debug_write(file, buf, count);
+	return yaffs_proc_write_trace_options(file, buf, count);
+}
+
+/* Stuff to handle installation of file systems */
+struct file_system_to_install {
+	struct file_system_type *fst;
+	int installed;
+};
+
+static struct file_system_to_install fs_to_install[] = {
+	{&yaffs_fs_type, 0},
+	{&yaffs2_fs_type, 0},
+	{NULL, 0}
+};
+
+
+#ifdef YAFFS_NEW_PROCFS
+static int yaffs_proc_show(struct seq_file *m, void *v)
+{
+	/* FIXME: Unify in a better way? */
+	char buffer[512];
+	char *start;
+	int len;
+
+	len = yaffs_proc_read(buffer, &start, 0, sizeof(buffer), NULL, NULL);
+	seq_puts(m, buffer);
+	return 0;
+}
+
+static int yaffs_proc_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, yaffs_proc_show, NULL);
+}
+
+static struct file_operations procfs_ops = {
+	.owner = THIS_MODULE,
+	.open  = yaffs_proc_open,
+	.read  = seq_read,
+	.write = yaffs_proc_write,
+};
+
+static int yaffs_procfs_init(void)
+{
+	/* Install the proc_fs entries */
+	my_proc_entry = proc_create("yaffs",
+				    S_IRUGO | S_IFREG,
+				    YPROC_ROOT,
+				    &procfs_ops);
+
+	if (my_proc_entry) {
+		return 0;
+	} else {
+		return -ENOMEM;
+	}
+}
+
+#else
+
+
+static int yaffs_procfs_init(void)
+{
+	/* Install the proc_fs entries */
+	my_proc_entry = create_proc_entry("yaffs",
+					  S_IRUGO | S_IFREG, YPROC_ROOT);
+
+	if (my_proc_entry) {
+		my_proc_entry->write_proc = yaffs_proc_write;
+		my_proc_entry->read_proc = yaffs_proc_read;
+		my_proc_entry->data = NULL;
+		return 0;
+	} else {
+		return -ENOMEM;
+	}
+}
+
+#endif
+
+
+static int __init init_yaffs_fs(void)
+{
+	int error = 0;
+	struct file_system_to_install *fsinst;
+
+	yaffs_trace(YAFFS_TRACE_ALWAYS,
+		"yaffs Installing.");
+
+	mutex_init(&yaffs_context_lock);
+
+	error = yaffs_procfs_init();
+	if (error)
+		return error;
+
+	/* Now add the file system entries */
+
+	fsinst = fs_to_install;
+
+	while (fsinst->fst && !error) {
+		error = register_filesystem(fsinst->fst);
+		if (!error)
+			fsinst->installed = 1;
+		fsinst++;
+	}
+
+	/* Any errors? uninstall  */
+	if (error) {
+		fsinst = fs_to_install;
+
+		while (fsinst->fst) {
+			if (fsinst->installed) {
+				unregister_filesystem(fsinst->fst);
+				fsinst->installed = 0;
+			}
+			fsinst++;
+		}
+	}
+
+	return error;
+}
+
+static void __exit exit_yaffs_fs(void)
+{
+
+	struct file_system_to_install *fsinst;
+
+	yaffs_trace(YAFFS_TRACE_ALWAYS,
+		"yaffs removing.");
+
+	remove_proc_entry("yaffs", YPROC_ROOT);
+
+	fsinst = fs_to_install;
+
+	while (fsinst->fst) {
+		if (fsinst->installed) {
+			unregister_filesystem(fsinst->fst);
+			fsinst->installed = 0;
+		}
+		fsinst++;
+	}
+}
+
+module_init(init_yaffs_fs)
+    module_exit(exit_yaffs_fs)
+
+    MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
+MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2011");
+MODULE_LICENSE("GPL");
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_yaffs1.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_yaffs1.c
--- linux-4.13.3/fs/yaffs2/yaffs_yaffs1.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_yaffs1.c	2018-01-10 15:09:56.573935500 +0800
@@ -0,0 +1,424 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_yaffs1.h"
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+#include "yaffs_attribs.h"
+
+int yaffs1_scan(struct yaffs_dev *dev)
+{
+	struct yaffs_ext_tags tags;
+	u32 blk;
+	int result;
+	int chunk;
+	u32 c;
+	int deleted;
+	enum yaffs_block_state state;
+	LIST_HEAD(hard_list);
+	struct yaffs_block_info *bi;
+	u32 seq_number;
+	struct yaffs_obj_hdr *oh;
+	struct yaffs_obj *in;
+	struct yaffs_obj *parent;
+	int alloc_failed = 0;
+	struct yaffs_shadow_fixer *shadow_fixers = NULL;
+	u8 *chunk_data;
+
+	yaffs_trace(YAFFS_TRACE_SCAN,
+		"yaffs1_scan starts  intstartblk %d intendblk %d...",
+		dev->internal_start_block, dev->internal_end_block);
+
+	chunk_data = yaffs_get_temp_buffer(dev);
+
+	dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+	/* Scan all the blocks to determine their state */
+	bi = dev->block_info;
+	for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
+	     blk++) {
+		yaffs_clear_chunk_bits(dev, blk);
+		bi->pages_in_use = 0;
+		bi->soft_del_pages = 0;
+
+		yaffs_query_init_block_state(dev, blk, &state, &seq_number);
+
+		bi->block_state = state;
+		bi->seq_number = seq_number;
+
+		if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
+			bi->block_state = state = YAFFS_BLOCK_STATE_DEAD;
+
+		yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
+			"Block scanning block %d state %d seq %d",
+			blk, state, seq_number);
+
+		if (state == YAFFS_BLOCK_STATE_DEAD) {
+			yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
+				"block %d is bad", blk);
+		} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+			yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
+			dev->n_erased_blocks++;
+			dev->n_free_chunks += dev->param.chunks_per_block;
+		}
+		bi++;
+	}
+
+	/* For each block.... */
+	for (blk = dev->internal_start_block;
+	     !alloc_failed && blk <= dev->internal_end_block; blk++) {
+
+		cond_resched();
+
+		bi = yaffs_get_block_info(dev, blk);
+		state = bi->block_state;
+
+		deleted = 0;
+
+		/* For each chunk in each block that needs scanning.... */
+		for (c = 0;
+			!alloc_failed && c < dev->param.chunks_per_block &&
+			state == YAFFS_BLOCK_STATE_NEEDS_SCAN; c++) {
+			/* Read the tags and decide what to do */
+			chunk = blk * dev->param.chunks_per_block + c;
+
+			result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL,
+							  &tags);
+
+			if (result != YAFFS_OK)
+				continue;
+			/* Let's have a good look at this chunk... */
+
+			if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED ||
+			    tags.is_deleted) {
+				/* YAFFS1 only...
+				 * A deleted chunk
+				 */
+				deleted++;
+				dev->n_free_chunks++;
+			} else if (!tags.chunk_used) {
+				/* An unassigned chunk in the block
+				 * This means that either the block is empty or
+				 * this is the one being allocated from
+				 */
+
+				if (c == 0) {
+					/* We're looking at the first chunk in
+					 *the block so the block is unused */
+					state = YAFFS_BLOCK_STATE_EMPTY;
+					dev->n_erased_blocks++;
+				} else {
+					/* this is the block being allocated */
+					yaffs_trace(YAFFS_TRACE_SCAN,
+						" Allocating from %d %d",
+						blk, c);
+					state = YAFFS_BLOCK_STATE_ALLOCATING;
+					dev->alloc_block = blk;
+					dev->alloc_page = c;
+					dev->alloc_block_finder = blk;
+
+				}
+
+				dev->n_free_chunks +=
+				    (dev->param.chunks_per_block - c);
+			} else if (tags.chunk_id > 0) {
+				/* chunk_id > 0 so it is a data chunk... */
+				unsigned int endpos;
+
+				yaffs_set_chunk_bit(dev, blk, c);
+				bi->pages_in_use++;
+
+				in = yaffs_find_or_create_by_number(dev,
+							tags.obj_id,
+							YAFFS_OBJECT_TYPE_FILE);
+				/* PutChunkIntoFile checks for a clash
+				 * (two data chunks with the same chunk_id).
+				 */
+
+				if (!in)
+					alloc_failed = 1;
+
+				if (in) {
+					if (!yaffs_put_chunk_in_file
+					    (in, tags.chunk_id, chunk, 1))
+						alloc_failed = 1;
+				}
+
+				endpos =
+				    (tags.chunk_id - 1) *
+				    dev->data_bytes_per_chunk +
+				    tags.n_bytes;
+				if (in &&
+				    in->variant_type ==
+				     YAFFS_OBJECT_TYPE_FILE &&
+				    in->variant.file_variant.stored_size <
+				      endpos) {
+					in->variant.file_variant.stored_size =
+					    endpos;
+					if (!dev->param.use_header_file_size) {
+						in->variant.
+						    file_variant.file_size =
+						    in->variant.
+						    file_variant.stored_size;
+					}
+
+				}
+			} else {
+				/* chunk_id == 0, so it is an ObjectHeader.
+				 * Make the object
+				 */
+				yaffs_set_chunk_bit(dev, blk, c);
+				bi->pages_in_use++;
+
+				result = yaffs_rd_chunk_tags_nand(dev, chunk,
+								  chunk_data,
+								  NULL);
+
+				oh = (struct yaffs_obj_hdr *)chunk_data;
+
+				in = yaffs_find_by_number(dev, tags.obj_id);
+				if (in && in->variant_type != oh->type) {
+					/* This should not happen, but somehow
+					 * Wev'e ended up with an obj_id that
+					 * has been reused but not yet deleted,
+					 * and worse still it has changed type.
+					 * Delete the old object.
+					 */
+
+					yaffs_del_obj(in);
+					in = NULL;
+				}
+
+				in = yaffs_find_or_create_by_number(dev,
+								tags.obj_id,
+								oh->type);
+
+				if (!in)
+					alloc_failed = 1;
+
+				if (in && oh->shadows_obj > 0) {
+
+					struct yaffs_shadow_fixer *fixer;
+					fixer =
+						kmalloc(sizeof
+						(struct yaffs_shadow_fixer),
+						GFP_NOFS);
+					if (fixer) {
+						fixer->next = shadow_fixers;
+						shadow_fixers = fixer;
+						fixer->obj_id = tags.obj_id;
+						fixer->shadowed_id =
+						    oh->shadows_obj;
+						yaffs_trace(YAFFS_TRACE_SCAN,
+							" Shadow fixer: %d shadows %d",
+							fixer->obj_id,
+							fixer->shadowed_id);
+
+					}
+
+				}
+
+				if (in && in->valid) {
+					/* We have already filled this one.
+					 * We have a duplicate and need to
+					 * resolve it. */
+
+					unsigned existing_serial = in->serial;
+					unsigned new_serial =
+					    tags.serial_number;
+
+					if (((existing_serial + 1) & 3) ==
+					    new_serial) {
+						/* Use new one - destroy the
+						 * exisiting one */
+						yaffs_chunk_del(dev,
+								in->hdr_chunk,
+								1, __LINE__);
+						in->valid = 0;
+					} else {
+						/* Use existing - destroy
+						 * this one. */
+						yaffs_chunk_del(dev, chunk, 1,
+								__LINE__);
+					}
+				}
+
+				if (in && !in->valid &&
+				    (tags.obj_id == YAFFS_OBJECTID_ROOT ||
+				     tags.obj_id ==
+				     YAFFS_OBJECTID_LOSTNFOUND)) {
+					/* We only load some info, don't fiddle
+					 * with directory structure */
+					in->valid = 1;
+					in->variant_type = oh->type;
+
+					in->yst_mode = oh->yst_mode;
+					yaffs_load_attribs(in, oh);
+					in->hdr_chunk = chunk;
+					in->serial = tags.serial_number;
+
+				} else if (in && !in->valid) {
+					/* we need to load this info */
+
+					in->valid = 1;
+					in->variant_type = oh->type;
+
+					in->yst_mode = oh->yst_mode;
+					yaffs_load_attribs(in, oh);
+					in->hdr_chunk = chunk;
+					in->serial = tags.serial_number;
+
+					yaffs_set_obj_name_from_oh(in, oh);
+					in->dirty = 0;
+
+					/* directory stuff...
+					 * hook up to parent
+					 */
+
+					parent =
+					    yaffs_find_or_create_by_number
+					    (dev, oh->parent_obj_id,
+					     YAFFS_OBJECT_TYPE_DIRECTORY);
+					if (!parent)
+						alloc_failed = 1;
+					if (parent && parent->variant_type ==
+					    YAFFS_OBJECT_TYPE_UNKNOWN) {
+						/* Set up as a directory */
+						parent->variant_type =
+						    YAFFS_OBJECT_TYPE_DIRECTORY;
+						INIT_LIST_HEAD(&parent->
+							variant.dir_variant.
+							children);
+					} else if (!parent ||
+						parent->variant_type !=
+						YAFFS_OBJECT_TYPE_DIRECTORY) {
+						/* Hoosterman, a problem....
+						 * We're trying to use a
+						 * non-directory as a directory
+						 */
+
+						yaffs_trace(YAFFS_TRACE_ERROR,
+							"yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
+							);
+						parent = dev->lost_n_found;
+					}
+
+					yaffs_add_obj_to_dir(parent, in);
+
+					switch (in->variant_type) {
+					case YAFFS_OBJECT_TYPE_UNKNOWN:
+						/* Todo got a problem */
+						break;
+					case YAFFS_OBJECT_TYPE_FILE:
+						if (dev->param.
+						    use_header_file_size)
+							in->variant.
+							file_variant.file_size
+							= yaffs_oh_to_size(dev, oh, 0);
+						break;
+					case YAFFS_OBJECT_TYPE_HARDLINK:
+						in->variant.
+						    hardlink_variant.equiv_id =
+						    oh->equiv_id;
+						list_add(&in->hard_links,
+								&hard_list);
+						break;
+					case YAFFS_OBJECT_TYPE_DIRECTORY:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SPECIAL:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SYMLINK:
+						in->variant.symlink_variant.
+						    alias =
+						    yaffs_clone_str(oh->alias);
+						if (!in->variant.
+						    symlink_variant.alias)
+							alloc_failed = 1;
+						break;
+					}
+				}
+			}
+		}
+
+		if (state == YAFFS_BLOCK_STATE_NEEDS_SCAN) {
+			/* If we got this far while scanning,
+			 * then the block is fully allocated. */
+			state = YAFFS_BLOCK_STATE_FULL;
+		}
+
+		if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
+			/* If the block was partially allocated then
+			 * treat it as fully allocated. */
+			state = YAFFS_BLOCK_STATE_FULL;
+			dev->alloc_block = -1;
+		}
+
+		bi->block_state = state;
+
+		/* Now let's see if it was dirty */
+		if (bi->pages_in_use == 0 &&
+		    !bi->has_shrink_hdr &&
+		    bi->block_state == YAFFS_BLOCK_STATE_FULL)
+			yaffs_block_became_dirty(dev, blk);
+	}
+
+	/* Ok, we've done all the scanning.
+	 * Fix up the hard link chains.
+	 * We should now have scanned all the objects, now it's time to add
+	 * these hardlinks.
+	 */
+
+	yaffs_link_fixup(dev, &hard_list);
+
+	/*
+	 * Fix up any shadowed objects.
+	 * There should not be more than one of these.
+	 */
+	{
+		struct yaffs_shadow_fixer *fixer;
+		struct yaffs_obj *obj;
+
+		while (shadow_fixers) {
+			fixer = shadow_fixers;
+			shadow_fixers = fixer->next;
+			/* Complete the rename transaction by deleting the
+			 * shadowed object then setting the object header
+			 to unshadowed.
+			 */
+			obj = yaffs_find_by_number(dev, fixer->shadowed_id);
+			if (obj)
+				yaffs_del_obj(obj);
+
+			obj = yaffs_find_by_number(dev, fixer->obj_id);
+
+			if (obj)
+				yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
+
+			kfree(fixer);
+		}
+	}
+
+	yaffs_release_temp_buffer(dev, chunk_data);
+
+	if (alloc_failed)
+		return YAFFS_FAIL;
+
+	yaffs_trace(YAFFS_TRACE_SCAN, "yaffs1_scan ends");
+
+	return YAFFS_OK;
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_yaffs1.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_yaffs1.h
--- linux-4.13.3/fs/yaffs2/yaffs_yaffs1.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_yaffs1.h	2018-01-10 15:09:56.577935391 +0800
@@ -0,0 +1,22 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_YAFFS1_H__
+#define __YAFFS_YAFFS1_H__
+
+#include "yaffs_guts.h"
+int yaffs1_scan(struct yaffs_dev *dev);
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_yaffs2.c /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_yaffs2.c
--- linux-4.13.3/fs/yaffs2/yaffs_yaffs2.c	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_yaffs2.c	2018-01-10 15:09:56.573935500 +0800
@@ -0,0 +1,1712 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_checkptrw.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_nand.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_verify.h"
+#include "yaffs_attribs.h"
+#include "yaffs_summary.h"
+#include "yaffs_endian.h"
+
+/*
+ * Checkpoints are really no benefit on very small partitions.
+ *
+ * To save space on small partitions don't bother with checkpoints unless
+ * the partition is at least this big.
+ */
+#define YAFFS_CHECKPOINT_MIN_BLOCKS 60
+#define YAFFS_SMALL_HOLE_THRESHOLD 4
+
+/*
+ * Oldest Dirty Sequence Number handling.
+ */
+
+/* yaffs_calc_oldest_dirty_seq()
+ * yaffs2_find_oldest_dirty_seq()
+ * Calculate the oldest dirty sequence number if we don't know it.
+ */
+void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev)
+{
+	u32 i;
+	unsigned seq;
+	unsigned block_no = 0;
+	struct yaffs_block_info *b;
+
+	if (!dev->param.is_yaffs2)
+		return;
+
+	/* Find the oldest dirty sequence number. */
+	seq = dev->seq_number + 1;
+	b = dev->block_info;
+	for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
+		if (b->block_state == YAFFS_BLOCK_STATE_FULL &&
+		    (u32)(b->pages_in_use - b->soft_del_pages) <
+		    dev->param.chunks_per_block &&
+		    b->seq_number < seq) {
+			seq = b->seq_number;
+			block_no = i;
+		}
+		b++;
+	}
+
+	if (block_no) {
+		dev->oldest_dirty_seq = seq;
+		dev->oldest_dirty_block = block_no;
+	}
+}
+
+void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev)
+{
+	if (!dev->param.is_yaffs2)
+		return;
+
+	if (!dev->oldest_dirty_seq)
+		yaffs_calc_oldest_dirty_seq(dev);
+}
+
+/*
+ * yaffs_clear_oldest_dirty_seq()
+ * Called when a block is erased or marked bad. (ie. when its seq_number
+ * becomes invalid). If the value matches the oldest then we clear
+ * dev->oldest_dirty_seq to force its recomputation.
+ */
+void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev,
+				   struct yaffs_block_info *bi)
+{
+
+	if (!dev->param.is_yaffs2)
+		return;
+
+	if (!bi || bi->seq_number == dev->oldest_dirty_seq) {
+		dev->oldest_dirty_seq = 0;
+		dev->oldest_dirty_block = 0;
+	}
+}
+
+/*
+ * yaffs2_update_oldest_dirty_seq()
+ * Update the oldest dirty sequence number whenever we dirty a block.
+ * Only do this if the oldest_dirty_seq is actually being tracked.
+ */
+void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no,
+				    struct yaffs_block_info *bi)
+{
+	if (!dev->param.is_yaffs2)
+		return;
+
+	if (dev->oldest_dirty_seq) {
+		if (dev->oldest_dirty_seq > bi->seq_number) {
+			dev->oldest_dirty_seq = bi->seq_number;
+			dev->oldest_dirty_block = block_no;
+		}
+	}
+}
+
+int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi)
+{
+
+	if (!dev->param.is_yaffs2)
+		return 1;	/* disqualification only applies to yaffs2. */
+
+	if (!bi->has_shrink_hdr)
+		return 1;	/* can gc */
+
+	yaffs2_find_oldest_dirty_seq(dev);
+
+	/* Can't do gc of this block if there are any blocks older than this
+	 * one that have discarded pages.
+	 */
+	return (bi->seq_number <= dev->oldest_dirty_seq);
+}
+
+/*
+ * yaffs2_find_refresh_block()
+ * periodically finds the oldest full block by sequence number for refreshing.
+ * Only for yaffs2.
+ */
+u32 yaffs2_find_refresh_block(struct yaffs_dev *dev)
+{
+	u32 b;
+	u32 oldest = 0;
+	u32 oldest_seq = 0;
+	struct yaffs_block_info *bi;
+
+	if (!dev->param.is_yaffs2)
+		return oldest;
+
+	/*
+	 * If refresh period < 10 then refreshing is disabled.
+	 */
+	if (dev->param.refresh_period < 10)
+		return oldest;
+
+	/*
+	 * Fix broken values.
+	 */
+	if (dev->refresh_skip > dev->param.refresh_period)
+		dev->refresh_skip = dev->param.refresh_period;
+
+	if (dev->refresh_skip > 0)
+		return oldest;
+
+	/*
+	 * Refresh skip is now zero.
+	 * We'll do a refresh this time around....
+	 * Update the refresh skip and find the oldest block.
+	 */
+	dev->refresh_skip = dev->param.refresh_period;
+	dev->refresh_count++;
+	bi = dev->block_info;
+	for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
+
+		if (bi->block_state == YAFFS_BLOCK_STATE_FULL) {
+
+			if (oldest < 1 || bi->seq_number < oldest_seq) {
+				oldest = b;
+				oldest_seq = bi->seq_number;
+			}
+		}
+		bi++;
+	}
+
+	if (oldest > 0) {
+		yaffs_trace(YAFFS_TRACE_GC,
+			"GC refresh count %d selected block %d with seq_number %d",
+			dev->refresh_count, oldest, oldest_seq);
+	}
+
+	return oldest;
+}
+
+int yaffs2_checkpt_required(struct yaffs_dev *dev)
+{
+	int nblocks;
+
+	if (!dev->param.is_yaffs2)
+		return 0;
+
+	nblocks = dev->internal_end_block - dev->internal_start_block + 1;
+
+	return !dev->param.skip_checkpt_wr &&
+	    !dev->read_only && (nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS);
+}
+
+int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev)
+{
+	int retval;
+	int n_bytes = 0;
+	int n_blocks;
+	int dev_blocks;
+
+	if (!dev->param.is_yaffs2)
+		return 0;
+
+	if (!dev->checkpoint_blocks_required && yaffs2_checkpt_required(dev)) {
+		/* Not a valid value so recalculate */
+		dev_blocks = dev->param.end_block - dev->param.start_block + 1;
+		n_bytes += sizeof(struct yaffs_checkpt_validity);
+		n_bytes += sizeof(struct yaffs_checkpt_dev);
+		n_bytes += dev_blocks * sizeof(struct yaffs_block_info);
+		n_bytes += dev_blocks * dev->chunk_bit_stride;
+		n_bytes +=
+		    (sizeof(struct yaffs_checkpt_obj) + sizeof(u32)) *
+		    dev->n_obj;
+		n_bytes += (dev->tnode_size + sizeof(u32)) * dev->n_tnodes;
+		n_bytes += sizeof(struct yaffs_checkpt_validity);
+		n_bytes += sizeof(u32);	/* checksum */
+
+		/* Round up and add 2 blocks to allow for some bad blocks,
+		 * so add 3 */
+
+		n_blocks =
+		    (n_bytes /
+		     (dev->data_bytes_per_chunk *
+		      dev->param.chunks_per_block)) + 3;
+
+		dev->checkpoint_blocks_required = n_blocks;
+	}
+
+	retval = dev->checkpoint_blocks_required - dev->blocks_in_checkpt;
+	if (retval < 0)
+		retval = 0;
+	return retval;
+}
+
+/*--------------------- Checkpointing --------------------*/
+
+static void yaffs2_do_endian_validity_marker(struct yaffs_dev *dev,
+					     struct yaffs_checkpt_validity *v)
+{
+
+	if (!dev->swap_endian)
+		return;
+	v->struct_type = swap_s32(v->struct_type);
+	v->magic = swap_u32(v->magic);
+	v->version = swap_u32(v->version);
+	v->head = swap_u32(v->head);
+}
+
+static int yaffs2_wr_checkpt_validity_marker(struct yaffs_dev *dev, int head)
+{
+	struct yaffs_checkpt_validity cp;
+
+	memset(&cp, 0, sizeof(cp));
+
+	cp.struct_type = sizeof(cp);
+	cp.magic = YAFFS_MAGIC;
+	cp.version = YAFFS_CHECKPOINT_VERSION;
+	cp.head = (head) ? 1 : 0;
+
+	yaffs2_do_endian_validity_marker(dev, &cp);
+
+	return (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp)) ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_validity_marker(struct yaffs_dev *dev, int head)
+{
+	struct yaffs_checkpt_validity cp;
+	int ok;
+
+	ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
+	yaffs2_do_endian_validity_marker(dev, &cp);
+
+	if (ok)
+		ok = (cp.struct_type == sizeof(cp)) &&
+		    (cp.magic == YAFFS_MAGIC) &&
+		    (cp.version == YAFFS_CHECKPOINT_VERSION) &&
+		    (cp.head == ((head) ? 1 : 0));
+	return ok ? 1 : 0;
+}
+
+static void yaffs2_dev_to_checkpt_dev(struct yaffs_checkpt_dev *cp,
+				      struct yaffs_dev *dev)
+{
+	cp->struct_type = sizeof(*cp);
+
+	cp->n_erased_blocks = dev->n_erased_blocks;
+	cp->alloc_block = dev->alloc_block;
+	cp->alloc_page = dev->alloc_page;
+	cp->n_free_chunks = dev->n_free_chunks;
+
+	cp->n_deleted_files = dev->n_deleted_files;
+	cp->n_unlinked_files = dev->n_unlinked_files;
+	cp->n_bg_deletions = dev->n_bg_deletions;
+	cp->seq_number = dev->seq_number;
+
+}
+
+static void yaffs_checkpt_dev_to_dev(struct yaffs_dev *dev,
+				     struct yaffs_checkpt_dev *cp)
+{
+	dev->n_erased_blocks = cp->n_erased_blocks;
+	dev->alloc_block = cp->alloc_block;
+	dev->alloc_page = cp->alloc_page;
+	dev->n_free_chunks = cp->n_free_chunks;
+
+	dev->n_deleted_files = cp->n_deleted_files;
+	dev->n_unlinked_files = cp->n_unlinked_files;
+	dev->n_bg_deletions = cp->n_bg_deletions;
+	dev->seq_number = cp->seq_number;
+}
+
+static void yaffs2_do_endian_checkpt_dev(struct yaffs_dev *dev,
+				     struct yaffs_checkpt_dev *cp)
+{
+	if (!dev->swap_endian)
+		return;
+	cp->struct_type = swap_s32(cp->struct_type);
+	cp->n_erased_blocks = swap_s32(cp->n_erased_blocks);
+	cp->alloc_block = swap_s32(cp->alloc_block);
+	cp->alloc_page = swap_u32(cp->alloc_page);
+	cp->n_free_chunks = swap_s32(cp->n_free_chunks);
+	cp->n_deleted_files = swap_s32(cp->n_deleted_files);
+	cp->n_unlinked_files = swap_s32(cp->n_unlinked_files);
+	cp->n_bg_deletions = swap_s32(cp->n_bg_deletions);
+}
+
+static int yaffs2_wr_checkpt_dev(struct yaffs_dev *dev)
+{
+	struct yaffs_checkpt_dev cp;
+	u32 n_bytes;
+	u32 n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
+	int ok;
+	u32 i;
+	union yaffs_block_info_union bu;
+
+	/* Write device runtime values */
+	yaffs2_dev_to_checkpt_dev(&cp, dev);
+	yaffs2_do_endian_checkpt_dev(dev, &cp);
+
+	ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
+	if (!ok)
+		return 0;
+
+	/* Write block info. */
+	if (!dev->swap_endian) {
+		n_bytes = n_blocks * sizeof(struct yaffs_block_info);
+		ok = (yaffs2_checkpt_wr(dev, dev->block_info, n_bytes) ==
+			(int)n_bytes);
+	} else {
+		/*
+		 * Need to swap the endianisms. We can't do this in place
+		 * since that would damage live data,
+		 * so write one block info at a time using a copy.
+		 */
+		for (i = 0; i < n_blocks && ok; i++) {
+			bu.bi = dev->block_info[i];
+			bu.as_u32[0] = swap_u32(bu.as_u32[0]);
+			bu.as_u32[1] = swap_u32(bu.as_u32[1]);
+			ok = (yaffs2_checkpt_wr(dev, &bu, sizeof(bu)) == sizeof(bu));
+		}
+	}
+
+	if (!ok)
+		return 0;
+
+	/*
+	 * Write chunk bits. Chunk bits are in bytes so
+	 * no endian conversion is needed.
+	 */
+	n_bytes = n_blocks * dev->chunk_bit_stride;
+	ok = (yaffs2_checkpt_wr(dev, dev->chunk_bits, n_bytes) ==
+		(int)n_bytes);
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_dev(struct yaffs_dev *dev)
+{
+	struct yaffs_checkpt_dev cp;
+	u32 n_bytes;
+	u32 n_blocks =
+	    (dev->internal_end_block - dev->internal_start_block + 1);
+	int ok;
+
+	ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
+	if (!ok)
+		return 0;
+	yaffs2_do_endian_checkpt_dev(dev, &cp);
+
+	if (cp.struct_type != sizeof(cp))
+		return 0;
+
+	yaffs_checkpt_dev_to_dev(dev, &cp);
+
+	n_bytes = n_blocks * sizeof(struct yaffs_block_info);
+
+	ok = (yaffs2_checkpt_rd(dev, dev->block_info, n_bytes) ==
+		(int)n_bytes);
+
+	if (!ok)
+		return 0;
+
+	if (dev->swap_endian) {
+		/* The block info can just be handled as a list of u32s. */
+		u32 *as_u32 = (u32 *) dev->block_info;
+		u32 n_u32s = n_bytes/sizeof(u32);
+		u32 i;
+
+		for (i=0; i < n_u32s; i++)
+			as_u32[i] = swap_u32(as_u32[i]);
+	}
+
+	n_bytes = n_blocks * dev->chunk_bit_stride;
+
+	ok = (yaffs2_checkpt_rd(dev, dev->chunk_bits, n_bytes) ==
+		(int)n_bytes);
+
+
+	return ok ? 1 : 0;
+}
+
+
+static void yaffs2_checkpt_obj_bit_assign(struct yaffs_checkpt_obj *cp,
+					  int bit_offset,
+					  int bit_width,
+					  u32 value)
+{
+	u32 and_mask;
+
+	and_mask = ((1<<bit_width)-1) << bit_offset;
+
+	cp->bit_field &= ~and_mask;
+	cp->bit_field |= ((value << bit_offset) & and_mask);
+}
+
+static u32 yaffs2_checkpt_obj_bit_get(struct yaffs_checkpt_obj *cp,
+				      int bit_offset,
+				      int bit_width)
+{
+	u32 and_mask;
+
+	and_mask = ((1<<bit_width)-1);
+
+	return (cp->bit_field >> bit_offset) & and_mask;
+}
+
+static void yaffs2_obj_checkpt_obj(struct yaffs_checkpt_obj *cp,
+				   struct yaffs_obj *obj)
+{
+	cp->obj_id = obj->obj_id;
+	cp->parent_id = (obj->parent) ? obj->parent->obj_id : 0;
+	cp->hdr_chunk = obj->hdr_chunk;
+
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_VARIANT_BITS, obj->variant_type);
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_DELETED_BITS, obj->deleted);
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_SOFT_DEL_BITS, obj->soft_del);
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_UNLINKED_BITS, obj->unlinked);
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_FAKE_BITS, obj->fake);
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_RENAME_ALLOWED_BITS, obj->rename_allowed);
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_UNLINK_ALLOWED_BITS, obj->unlink_allowed);
+	yaffs2_checkpt_obj_bit_assign(cp, CHECKPOINT_SERIAL_BITS, obj->serial);
+
+	cp->n_data_chunks = obj->n_data_chunks;
+
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
+		cp->size_or_equiv_obj = obj->variant.file_variant.file_size;
+	else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK)
+		cp->size_or_equiv_obj = obj->variant.hardlink_variant.equiv_id;
+}
+
+static int yaffs2_checkpt_obj_to_obj(struct yaffs_obj *obj,
+				     struct yaffs_checkpt_obj *cp)
+{
+	struct yaffs_obj *parent;
+	u32 cp_variant_type = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_VARIANT_BITS);
+
+	if (obj->variant_type != cp_variant_type) {
+		yaffs_trace(YAFFS_TRACE_ERROR,
+			"Checkpoint read object %d type %d chunk %d does not match existing object type %d",
+			cp->obj_id, cp_variant_type, cp->hdr_chunk,
+			obj->variant_type);
+		return 0;
+	}
+
+	obj->obj_id = cp->obj_id;
+
+	if (cp->parent_id)
+		parent = yaffs_find_or_create_by_number(obj->my_dev,
+						cp->parent_id,
+						YAFFS_OBJECT_TYPE_DIRECTORY);
+	else
+		parent = NULL;
+
+	if (parent) {
+		if (parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
+			yaffs_trace(YAFFS_TRACE_ALWAYS,
+				"Checkpoint read object %d parent %d type %d chunk %d Parent type, %d, not directory",
+				cp->obj_id, cp->parent_id,
+				cp_variant_type, cp->hdr_chunk,
+				parent->variant_type);
+			return 0;
+		}
+		yaffs_add_obj_to_dir(parent, obj);
+	}
+
+	obj->hdr_chunk = cp->hdr_chunk;
+
+	obj->variant_type = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_VARIANT_BITS);
+	obj->deleted = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_DELETED_BITS);
+	obj->soft_del = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_SOFT_DEL_BITS);
+	obj->unlinked = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_UNLINKED_BITS);
+	obj->fake = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_FAKE_BITS);
+	obj->rename_allowed = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_RENAME_ALLOWED_BITS);
+	obj->unlink_allowed = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_UNLINK_ALLOWED_BITS);
+	obj->serial = yaffs2_checkpt_obj_bit_get(cp, CHECKPOINT_SERIAL_BITS);
+
+	obj->n_data_chunks = cp->n_data_chunks;
+
+	if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE) {
+		obj->variant.file_variant.file_size = cp->size_or_equiv_obj;
+		obj->variant.file_variant.stored_size = cp->size_or_equiv_obj;
+	} else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
+		obj->variant.hardlink_variant.equiv_id = cp->size_or_equiv_obj;
+	}
+	if (obj->hdr_chunk > 0)
+		obj->lazy_loaded = 1;
+	return 1;
+}
+
+static void yaffs2_do_endian_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
+{
+	int i;
+	u32 *as_u32 = (u32 *)tn;
+	int tnode_size_u32 = dev->tnode_size / sizeof(u32);
+
+	if (!dev->swap_endian)
+		return;
+	/* Swap all the tnode data as u32s to fix endianisms. */
+	for (i = 0; i<tnode_size_u32; i++)
+		as_u32[i] = swap_u32(as_u32[i]);
+}
+
+struct yaffs_tnode *yaffs2_do_endian_tnode_copy(struct yaffs_dev *dev,
+					       struct yaffs_tnode *tn)
+{
+	if (!dev->swap_endian)
+		return tn;
+
+	memcpy(dev->tn_swap_buffer, tn, dev->tnode_size);
+	tn = dev->tn_swap_buffer;
+
+	yaffs2_do_endian_tnode(dev, tn);
+
+	return tn;
+}
+
+static int yaffs2_checkpt_tnode_worker(struct yaffs_obj *in,
+				       struct yaffs_tnode *tn, u32 level,
+				       int chunk_offset)
+{
+	int i;
+	struct yaffs_dev *dev = in->my_dev;
+	int ok = 1;
+	u32 base_offset;
+
+	if (!tn)
+		return 1;
+
+	if (level > 0) {
+		for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
+			if (!tn->internal[i])
+				continue;
+			ok = yaffs2_checkpt_tnode_worker(in,
+				 tn->internal[i],
+				 level - 1,
+				 (chunk_offset <<
+				  YAFFS_TNODES_INTERNAL_BITS) + i);
+		}
+		return ok;
+	}
+
+	/* Level 0 tnode */
+	base_offset = chunk_offset << YAFFS_TNODES_LEVEL0_BITS;
+	yaffs_do_endian_u32(dev, &base_offset);
+
+	ok = (yaffs2_checkpt_wr(dev, &base_offset, sizeof(base_offset)) ==
+			sizeof(base_offset));
+	if (ok) {
+		/*
+		 * NB Can't do an in-place endian swizzle since that would
+		 * damage current tnode data.
+		 * If a tnode endian conversion is required we do a copy.
+		 */
+		tn = yaffs2_do_endian_tnode_copy(dev, tn);
+		ok = (yaffs2_checkpt_wr(dev, tn, dev->tnode_size) ==
+			(int)dev->tnode_size);
+	}
+	return ok;
+}
+
+static int yaffs2_wr_checkpt_tnodes(struct yaffs_obj *obj)
+{
+	u32 end_marker = ~0;
+	int ok = 1;
+
+	if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
+		return ok;
+
+	ok = yaffs2_checkpt_tnode_worker(obj,
+					 obj->variant.file_variant.top,
+					 obj->variant.file_variant.
+					 top_level, 0);
+	if (ok)
+		ok = (yaffs2_checkpt_wr(obj->my_dev, &end_marker,
+				sizeof(end_marker)) == sizeof(end_marker));
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_tnodes(struct yaffs_obj *obj)
+{
+	u32 base_chunk;
+	int ok = 1;
+	struct yaffs_dev *dev = obj->my_dev;
+	struct yaffs_file_var *file_stuct_ptr = &obj->variant.file_variant;
+	struct yaffs_tnode *tn;
+	int nread = 0;
+
+	ok = (yaffs2_checkpt_rd(dev, &base_chunk, sizeof(base_chunk)) ==
+	      sizeof(base_chunk));
+
+	yaffs_do_endian_u32(dev, &base_chunk);
+
+	while (ok && (~base_chunk)) {
+		nread++;
+		/* Read level 0 tnode */
+
+		tn = yaffs_get_tnode(dev);
+		if (tn) {
+			ok = (yaffs2_checkpt_rd(dev, tn, dev->tnode_size) ==
+				(int)dev->tnode_size);
+			yaffs2_do_endian_tnode(dev, tn);
+		}
+		else
+			ok = 0;
+
+		if (tn && ok)
+			ok = yaffs_add_find_tnode_0(dev,
+						    file_stuct_ptr,
+						    base_chunk, tn) ? 1 : 0;
+
+		if (ok) {
+			ok = (yaffs2_checkpt_rd
+			      (dev, &base_chunk,
+			       sizeof(base_chunk)) == sizeof(base_chunk));
+			yaffs_do_endian_u32(dev, &base_chunk);
+		}
+
+	}
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"Checkpoint read tnodes %d records, last %d. ok %d",
+		nread, base_chunk, ok);
+
+	return ok ? 1 : 0;
+}
+
+
+static void yaffs2_do_endian_checkpt_obj(struct yaffs_dev *dev,
+					 struct yaffs_checkpt_obj *cp)
+{
+	if (!dev->swap_endian)
+		return;
+	cp->struct_type = swap_s32(cp->struct_type);
+	cp->obj_id = swap_u32(cp->obj_id);
+	cp->parent_id = swap_u32(cp->parent_id);
+	cp->hdr_chunk = swap_s32(cp->hdr_chunk);
+	cp->bit_field = swap_u32(cp->bit_field);
+	cp->n_data_chunks = swap_s32(cp->n_data_chunks);
+	cp->size_or_equiv_obj = swap_loff_t(cp->size_or_equiv_obj);
+}
+
+static int yaffs2_wr_checkpt_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_checkpt_obj cp;
+	int i;
+	int ok = 1;
+	struct list_head *lh;
+	u32 cp_variant_type;
+
+	/* Iterate through the objects in each hash entry,
+	 * dumping them to the checkpointing stream.
+	 */
+
+	for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) {
+		list_for_each(lh, &dev->obj_bucket[i].list) {
+			obj = list_entry(lh, struct yaffs_obj, hash_link);
+			if (!obj->defered_free) {
+				yaffs2_obj_checkpt_obj(&cp, obj);
+				cp.struct_type = sizeof(cp);
+				cp_variant_type = yaffs2_checkpt_obj_bit_get(
+						&cp, CHECKPOINT_VARIANT_BITS);
+				yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+					"Checkpoint write object %d parent %d type %d chunk %d obj addr %p",
+					cp.obj_id, cp.parent_id,
+					cp_variant_type, cp.hdr_chunk, obj);
+
+				yaffs2_do_endian_checkpt_obj (dev, &cp);
+				ok = (yaffs2_checkpt_wr(dev, &cp,
+						sizeof(cp)) == sizeof(cp));
+
+				if (ok &&
+					obj->variant_type ==
+					YAFFS_OBJECT_TYPE_FILE)
+					ok = yaffs2_wr_checkpt_tnodes(obj);
+			}
+		}
+	}
+
+	/* Dump end of list */
+	memset(&cp, 0xff, sizeof(struct yaffs_checkpt_obj));
+	cp.struct_type = sizeof(cp);
+	yaffs2_do_endian_checkpt_obj (dev, &cp);
+
+	if (ok)
+		ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_rd_checkpt_objs(struct yaffs_dev *dev)
+{
+	struct yaffs_obj *obj;
+	struct yaffs_checkpt_obj cp;
+	int ok = 1;
+	int done = 0;
+	u32 cp_variant_type;
+	LIST_HEAD(hard_list);
+
+
+	while (ok && !done) {
+		ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
+		yaffs2_do_endian_checkpt_obj (dev, &cp);
+
+		if (cp.struct_type != sizeof(cp)) {
+			yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+				"struct size %d instead of %d ok %d",
+				cp.struct_type, (int)sizeof(cp), ok);
+			ok = 0;
+		}
+
+		cp_variant_type = yaffs2_checkpt_obj_bit_get(
+						&cp, CHECKPOINT_VARIANT_BITS);
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"Checkpoint read object %d parent %d type %d chunk %d ",
+			cp.obj_id, cp.parent_id, cp_variant_type,
+			cp.hdr_chunk);
+
+		if (ok && cp.obj_id == (u32)(~0)) {
+			done = 1;
+		} else if (ok) {
+			obj =
+			    yaffs_find_or_create_by_number(dev, cp.obj_id,
+							   cp_variant_type);
+			if (obj) {
+				ok = yaffs2_checkpt_obj_to_obj(obj, &cp);
+				if (!ok)
+					break;
+				if (obj->variant_type ==
+					YAFFS_OBJECT_TYPE_FILE) {
+					ok = yaffs2_rd_checkpt_tnodes(obj);
+				} else if (obj->variant_type ==
+					YAFFS_OBJECT_TYPE_HARDLINK) {
+					list_add(&obj->hard_links, &hard_list);
+				}
+			} else {
+				ok = 0;
+			}
+		}
+	}
+
+	if (ok)
+		yaffs_link_fixup(dev, &hard_list);
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_wr_checkpt_sum(struct yaffs_dev *dev)
+{
+	u32 checkpt_sum;
+	int ok;
+
+	yaffs2_get_checkpt_sum(dev, &checkpt_sum);
+
+	yaffs_do_endian_u32(dev, &checkpt_sum);
+
+	ok = (yaffs2_checkpt_wr(dev, &checkpt_sum, sizeof(checkpt_sum)) ==
+		sizeof(checkpt_sum));
+
+	if (!ok)
+		return 0;
+
+	return 1;
+}
+
+static int yaffs2_rd_checkpt_sum(struct yaffs_dev *dev)
+{
+	u32 checkpt_sum0;
+	u32 checkpt_sum1;
+	int ok;
+
+	yaffs2_get_checkpt_sum(dev, &checkpt_sum0);
+
+	ok = (yaffs2_checkpt_rd(dev, &checkpt_sum1, sizeof(checkpt_sum1)) ==
+		sizeof(checkpt_sum1));
+
+	if (!ok)
+		return 0;
+	yaffs_do_endian_u32(dev, &checkpt_sum1);
+
+	if (checkpt_sum0 != checkpt_sum1)
+		return 0;
+
+	return 1;
+}
+
+static int yaffs2_wr_checkpt_data(struct yaffs_dev *dev)
+{
+	int ok = 1;
+
+	if (!yaffs2_checkpt_required(dev)) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"skipping checkpoint write");
+		ok = 0;
+	}
+
+	if (ok)
+		ok = yaffs2_checkpt_open(dev, 1);
+
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"write checkpoint validity");
+		ok = yaffs2_wr_checkpt_validity_marker(dev, 1);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"write checkpoint device");
+		ok = yaffs2_wr_checkpt_dev(dev);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"write checkpoint objects");
+		ok = yaffs2_wr_checkpt_objs(dev);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"write checkpoint validity");
+		ok = yaffs2_wr_checkpt_validity_marker(dev, 0);
+	}
+
+	if (ok)
+		ok = yaffs2_wr_checkpt_sum(dev);
+
+	if (!yaffs_checkpt_close(dev))
+		ok = 0;
+
+	if (ok)
+		dev->is_checkpointed = 1;
+	else
+		dev->is_checkpointed = 0;
+
+	return dev->is_checkpointed;
+}
+
+static int yaffs2_rd_checkpt_data(struct yaffs_dev *dev)
+{
+	int ok = 1;
+
+	if (!dev->param.is_yaffs2)
+		ok = 0;
+
+	if (ok && dev->param.skip_checkpt_rd) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"skipping checkpoint read");
+		ok = 0;
+	}
+
+	if (ok)
+		ok = yaffs2_checkpt_open(dev, 0); /* open for read */
+
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"read checkpoint validity");
+		ok = yaffs2_rd_checkpt_validity_marker(dev, 1);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"read checkpoint device");
+		ok = yaffs2_rd_checkpt_dev(dev);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"read checkpoint objects");
+		ok = yaffs2_rd_checkpt_objs(dev);
+	}
+	if (ok) {
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"read checkpoint validity");
+		ok = yaffs2_rd_checkpt_validity_marker(dev, 0);
+	}
+
+	if (ok) {
+		ok = yaffs2_rd_checkpt_sum(dev);
+		yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+			"read checkpoint checksum %d", ok);
+	}
+
+	if (!yaffs_checkpt_close(dev))
+		ok = 0;
+
+	if (ok)
+		dev->is_checkpointed = 1;
+	else
+		dev->is_checkpointed = 0;
+
+	return ok ? 1 : 0;
+}
+
+void yaffs2_checkpt_invalidate(struct yaffs_dev *dev)
+{
+	if (dev->is_checkpointed || dev->blocks_in_checkpt > 0) {
+		dev->is_checkpointed = 0;
+		yaffs2_checkpt_invalidate_stream(dev);
+	}
+	if (dev->param.sb_dirty_fn)
+		dev->param.sb_dirty_fn(dev);
+}
+
+int yaffs_checkpoint_save(struct yaffs_dev *dev)
+{
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"save entry: is_checkpointed %d",
+		dev->is_checkpointed);
+
+	yaffs_verify_objects(dev);
+	yaffs_verify_blocks(dev);
+	yaffs_verify_free_chunks(dev);
+
+	if (!dev->is_checkpointed) {
+		yaffs2_checkpt_invalidate(dev);
+		yaffs2_wr_checkpt_data(dev);
+	}
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT | YAFFS_TRACE_MOUNT,
+		"save exit: is_checkpointed %d",
+		dev->is_checkpointed);
+
+	return dev->is_checkpointed;
+}
+
+int yaffs2_checkpt_restore(struct yaffs_dev *dev)
+{
+	int retval;
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"restore entry: is_checkpointed %d",
+		dev->is_checkpointed);
+
+	retval = yaffs2_rd_checkpt_data(dev);
+
+	if (dev->is_checkpointed) {
+		yaffs_verify_objects(dev);
+		yaffs_verify_blocks(dev);
+		yaffs_verify_free_chunks(dev);
+	}
+
+	yaffs_trace(YAFFS_TRACE_CHECKPOINT,
+		"restore exit: is_checkpointed %d",
+		dev->is_checkpointed);
+
+	return retval;
+}
+
+/* End of checkpointing */
+
+/* Hole handling logic for truncate past end of file */
+
+int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size)
+{
+	/* if new_size > old_file_size.
+	 * We're going to be writing a hole.
+	 * If the hole is small then write zeros otherwise write a start
+	 * of hole marker.
+	 */
+	loff_t old_file_size;
+	loff_t increase;
+	int small_hole;
+	int result = YAFFS_OK;
+	struct yaffs_dev *dev = NULL;
+	u8 *local_buffer = NULL;
+	int small_increase_ok = 0;
+
+	if (!obj)
+		return YAFFS_FAIL;
+
+	if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
+		return YAFFS_FAIL;
+
+	dev = obj->my_dev;
+
+	/* Bail out if not yaffs2 mode */
+	if (!dev->param.is_yaffs2)
+		return YAFFS_OK;
+
+	old_file_size = obj->variant.file_variant.file_size;
+
+	if (new_size <= old_file_size)
+		return YAFFS_OK;
+
+	increase = new_size - old_file_size;
+
+	if (increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->data_bytes_per_chunk &&
+	    yaffs_check_alloc_available(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
+		small_hole = 1;
+	else
+		small_hole = 0;
+
+	if (small_hole)
+		local_buffer = yaffs_get_temp_buffer(dev);
+
+	if (local_buffer) {
+		/* fill hole with zero bytes */
+		loff_t pos = old_file_size;
+		int this_write;
+		int written;
+		memset(local_buffer, 0, dev->data_bytes_per_chunk);
+		small_increase_ok = 1;
+
+		while (increase > 0 && small_increase_ok) {
+			this_write = increase;
+			if (this_write > (int)dev->data_bytes_per_chunk)
+				this_write = dev->data_bytes_per_chunk;
+			written =
+			    yaffs_do_file_wr(obj, local_buffer, pos, this_write,
+					     0);
+			if (written == this_write) {
+				pos += this_write;
+				increase -= this_write;
+			} else {
+				small_increase_ok = 0;
+			}
+		}
+
+		yaffs_release_temp_buffer(dev, local_buffer);
+
+		/* If out of space then reverse any chunks we've added */
+		if (!small_increase_ok)
+			yaffs_resize_file_down(obj, old_file_size);
+	}
+
+	if (!small_increase_ok &&
+	    obj->parent &&
+	    obj->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
+	    obj->parent->obj_id != YAFFS_OBJECTID_DELETED) {
+		/* Write a hole start header with the old file size */
+		yaffs_update_oh(obj, NULL, 0, 1, 0, NULL);
+	}
+
+	return result;
+}
+
+/* Yaffs2 scanning */
+
+struct yaffs_block_index {
+	int seq;
+	int block;
+};
+
+static int yaffs2_ybicmp(const void *a, const void *b)
+{
+	int aseq = ((struct yaffs_block_index *)a)->seq;
+	int bseq = ((struct yaffs_block_index *)b)->seq;
+	int ablock = ((struct yaffs_block_index *)a)->block;
+	int bblock = ((struct yaffs_block_index *)b)->block;
+
+	if (aseq == bseq)
+		return ablock - bblock;
+
+	return aseq - bseq;
+}
+
+static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
+		struct yaffs_block_info *bi,
+		int blk, int chunk_in_block,
+		int *found_chunks,
+		u8 *chunk_data,
+		struct list_head *hard_list,
+		int summary_available)
+{
+	struct yaffs_obj_hdr *oh;
+	struct yaffs_obj *in;
+	struct yaffs_obj *parent;
+	int equiv_id;
+	loff_t file_size;
+	int is_shrink;
+	int is_unlinked;
+	struct yaffs_ext_tags tags;
+	int result;
+	int alloc_failed = 0;
+	int chunk = blk * dev->param.chunks_per_block + chunk_in_block;
+	struct yaffs_file_var *file_var;
+	struct yaffs_hardlink_var *hl_var;
+	struct yaffs_symlink_var *sl_var;
+
+	if (summary_available) {
+		result = yaffs_summary_fetch(dev, &tags, chunk_in_block);
+		tags.seq_number = bi->seq_number;
+	}
+
+	if (!summary_available || tags.obj_id == 0) {
+		result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL, &tags);
+		dev->tags_used++;
+	} else {
+		dev->summary_used++;
+	}
+
+	if (result == YAFFS_FAIL)
+		yaffs_trace(YAFFS_TRACE_SCAN,
+				"Could not get tags for chunk %d\n", chunk);
+	/* Let's have a good look at this chunk... */
+
+	if (!tags.chunk_used) {
+		/* An unassigned chunk in the block.
+		 * If there are used chunks after this one, then
+		 * it is a chunk that was skipped due to failing
+		 * the erased check. Just skip it so that it can
+		 * be deleted.
+		 * But, more typically, We get here when this is
+		 * an unallocated chunk and his means that
+		 * either the block is empty or this is the one
+		 * being allocated from
+		 */
+
+		if (*found_chunks) {
+			/* This is a chunk that was skipped due
+			 * to failing the erased check */
+		} else if (chunk_in_block == 0) {
+			/* We're looking at the first chunk in
+			 * the block so the block is unused */
+			bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
+			dev->n_erased_blocks++;
+		} else {
+			if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
+			    bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
+				if (dev->seq_number == bi->seq_number) {
+					/* Allocating from this block*/
+					yaffs_trace(YAFFS_TRACE_SCAN,
+					    " Allocating from %d %d",
+					    blk, chunk_in_block);
+
+					bi->block_state =
+						YAFFS_BLOCK_STATE_ALLOCATING;
+					dev->alloc_block = blk;
+					dev->alloc_page = chunk_in_block;
+					dev->alloc_block_finder = blk;
+				} else {
+					/* This is a partially written block
+					 * that is not the current
+					 * allocation block.
+					 */
+					yaffs_trace(YAFFS_TRACE_SCAN,
+						"Partially written block %d detected. gc will fix this.",
+						blk);
+				}
+			}
+		}
+
+		dev->n_free_chunks++;
+
+	} else if (tags.ecc_result ==
+		YAFFS_ECC_RESULT_UNFIXED) {
+		yaffs_trace(YAFFS_TRACE_SCAN,
+			" Unfixed ECC in chunk(%d:%d), chunk ignored",
+			blk, chunk_in_block);
+			dev->n_free_chunks++;
+	} else if (tags.obj_id > YAFFS_MAX_OBJECT_ID ||
+		   tags.chunk_id > YAFFS_MAX_CHUNK_ID ||
+		   tags.obj_id == YAFFS_OBJECTID_SUMMARY ||
+		   (tags.chunk_id > 0 &&
+		     tags.n_bytes > dev->data_bytes_per_chunk) ||
+		   tags.seq_number != bi->seq_number) {
+		yaffs_trace(YAFFS_TRACE_SCAN,
+			"Chunk (%d:%d) with bad tags:obj = %d, chunk_id = %d, n_bytes = %d, ignored",
+			blk, chunk_in_block, tags.obj_id,
+			tags.chunk_id, tags.n_bytes);
+		dev->n_free_chunks++;
+	} else if (tags.chunk_id > 0) {
+		/* chunk_id > 0 so it is a data chunk... */
+		loff_t endpos;
+		loff_t chunk_base = (tags.chunk_id - 1) *
+					dev->data_bytes_per_chunk;
+
+		*found_chunks = 1;
+
+		yaffs_set_chunk_bit(dev, blk, chunk_in_block);
+		bi->pages_in_use++;
+
+		in = yaffs_find_or_create_by_number(dev,
+					tags.obj_id,
+					YAFFS_OBJECT_TYPE_FILE);
+		if (!in)
+			/* Out of memory */
+			alloc_failed = 1;
+
+		if (in &&
+		    in->variant_type == YAFFS_OBJECT_TYPE_FILE &&
+		    chunk_base < in->variant.file_variant.shrink_size) {
+			/* This has not been invalidated by
+			 * a resize */
+			if (!yaffs_put_chunk_in_file(in, tags.chunk_id,
+								chunk, -1))
+				alloc_failed = 1;
+
+			/* File size is calculated by looking at
+			 * the data chunks if we have not
+			 * seen an object header yet.
+			 * Stop this practice once we find an
+			 * object header.
+			 */
+			endpos = chunk_base + tags.n_bytes;
+
+			if (!in->valid &&
+			    in->variant.file_variant.stored_size < endpos) {
+				in->variant.file_variant.
+				    stored_size = endpos;
+				in->variant.file_variant.
+				    file_size = endpos;
+			}
+		} else if (in) {
+			/* This chunk has been invalidated by a
+			 * resize, or a past file deletion
+			 * so delete the chunk*/
+			yaffs_chunk_del(dev, chunk, 1, __LINE__);
+		}
+	} else {
+		/* chunk_id == 0, so it is an ObjectHeader.
+		 * Thus, we read in the object header and make
+		 * the object
+		 */
+		*found_chunks = 1;
+
+		yaffs_set_chunk_bit(dev, blk, chunk_in_block);
+		bi->pages_in_use++;
+
+		oh = NULL;
+		in = NULL;
+
+		if (tags.extra_available) {
+			in = yaffs_find_or_create_by_number(dev,
+					tags.obj_id,
+					tags.extra_obj_type);
+			if (!in)
+				alloc_failed = 1;
+		}
+
+		if (!in ||
+		    (!in->valid && dev->param.disable_lazy_load) ||
+		    tags.extra_shadows ||
+		    (!in->valid && (tags.obj_id == YAFFS_OBJECTID_ROOT ||
+				 tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND))) {
+
+			/* If we don't have  valid info then we
+			 * need to read the chunk
+			 * TODO In future we can probably defer
+			 * reading the chunk and living with
+			 * invalid data until needed.
+			 */
+
+			result = yaffs_rd_chunk_tags_nand(dev,
+						  chunk,
+						  chunk_data,
+						  NULL);
+
+			oh = (struct yaffs_obj_hdr *)chunk_data;
+
+			yaffs_do_endian_oh(dev, oh);
+
+			if (dev->param.inband_tags) {
+				/* Fix up the header if they got
+				 * corrupted by inband tags */
+				oh->shadows_obj =
+				    oh->inband_shadowed_obj_id;
+				oh->is_shrink =
+				    oh->inband_is_shrink;
+			}
+
+			if (!in) {
+				in = yaffs_find_or_create_by_number(dev,
+							tags.obj_id, oh->type);
+				if (!in)
+					alloc_failed = 1;
+			}
+		}
+
+		if (!in) {
+			/* TODO Hoosterman we have a problem! */
+			yaffs_trace(YAFFS_TRACE_ERROR,
+				"yaffs tragedy: Could not make object for object  %d at chunk %d during scan",
+				tags.obj_id, chunk);
+			return YAFFS_FAIL;
+		}
+
+		if (in->valid) {
+			/* We have already filled this one.
+			 * We have a duplicate that will be
+			 * discarded, but we first have to suck
+			 * out resize info if it is a file.
+			 */
+			if ((in->variant_type == YAFFS_OBJECT_TYPE_FILE) &&
+				((oh && oh->type == YAFFS_OBJECT_TYPE_FILE) ||
+				 (tags.extra_available &&
+				  tags.extra_obj_type == YAFFS_OBJECT_TYPE_FILE)
+				)) {
+				loff_t this_size = (oh) ?
+					yaffs_oh_to_size(dev, oh, 0) :
+					tags.extra_file_size;
+				u32 parent_obj_id = (oh) ?
+					(u32)oh->parent_obj_id :
+					tags.extra_parent_id;
+
+				is_shrink = (oh) ?
+					oh->is_shrink :
+					tags.extra_is_shrink;
+
+				/* If it is deleted (unlinked
+				 * at start also means deleted)
+				 * we treat the file size as
+				 * being zeroed at this point.
+				 */
+				if (parent_obj_id == YAFFS_OBJECTID_DELETED ||
+				    parent_obj_id == YAFFS_OBJECTID_UNLINKED) {
+					this_size = 0;
+					is_shrink = 1;
+				}
+
+				if (is_shrink &&
+				    in->variant.file_variant.shrink_size >
+				    this_size)
+					in->variant.file_variant.shrink_size =
+					this_size;
+
+				if (is_shrink)
+					bi->has_shrink_hdr = 1;
+			}
+			/* Use existing - destroy this one. */
+			yaffs_chunk_del(dev, chunk, 1, __LINE__);
+		}
+
+		if (!in->valid && in->variant_type !=
+		    (oh ? oh->type : tags.extra_obj_type)) {
+			yaffs_trace(YAFFS_TRACE_ERROR,
+				"yaffs tragedy: Bad type, %d != %d, for object %d at chunk %d during scan",
+				oh ? oh->type : tags.extra_obj_type,
+				in->variant_type, tags.obj_id,
+				chunk);
+			in = yaffs_retype_obj(in, oh ? oh->type : tags.extra_obj_type);
+		}
+
+		if (!in->valid &&
+		    (tags.obj_id == YAFFS_OBJECTID_ROOT ||
+		     tags.obj_id == YAFFS_OBJECTID_LOSTNFOUND)) {
+			/* We only load some info, don't fiddle
+			 * with directory structure */
+			in->valid = 1;
+
+			if (oh) {
+				in->yst_mode = oh->yst_mode;
+				yaffs_load_attribs(in, oh);
+				in->lazy_loaded = 0;
+			} else {
+				in->lazy_loaded = 1;
+			}
+			in->hdr_chunk = chunk;
+
+		} else if (!in->valid) {
+			/* we need to load this info */
+			in->valid = 1;
+			in->hdr_chunk = chunk;
+			if (oh) {
+				in->variant_type = oh->type;
+				in->yst_mode = oh->yst_mode;
+				yaffs_load_attribs(in, oh);
+
+				if (oh->shadows_obj > 0)
+					yaffs_handle_shadowed_obj(dev,
+					     oh->shadows_obj, 1);
+
+				yaffs_set_obj_name_from_oh(in, oh);
+				parent = yaffs_find_or_create_by_number(dev,
+						oh->parent_obj_id,
+						YAFFS_OBJECT_TYPE_DIRECTORY);
+				file_size = yaffs_oh_to_size(dev, oh, 0);
+				is_shrink = oh->is_shrink;
+				equiv_id = oh->equiv_id;
+			} else {
+				in->variant_type = tags.extra_obj_type;
+				parent = yaffs_find_or_create_by_number(dev,
+						tags.extra_parent_id,
+						YAFFS_OBJECT_TYPE_DIRECTORY);
+				file_size = tags.extra_file_size;
+				is_shrink = tags.extra_is_shrink;
+				equiv_id = tags.extra_equiv_id;
+				in->lazy_loaded = 1;
+			}
+			in->dirty = 0;
+
+			if (!parent)
+				alloc_failed = 1;
+
+			/* directory stuff...
+			 * hook up to parent
+			 */
+
+			if (parent &&
+			    parent->variant_type == YAFFS_OBJECT_TYPE_UNKNOWN) {
+				/* Set up as a directory */
+				parent->variant_type =
+					YAFFS_OBJECT_TYPE_DIRECTORY;
+				INIT_LIST_HEAD(&parent->
+						variant.dir_variant.children);
+			} else if (!parent ||
+				   parent->variant_type !=
+					YAFFS_OBJECT_TYPE_DIRECTORY) {
+				/* Hoosterman, another problem....
+				 * Trying to use a non-directory as a directory
+				 */
+
+				yaffs_trace(YAFFS_TRACE_ERROR,
+					"yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
+					);
+				parent = dev->lost_n_found;
+			}
+			yaffs_add_obj_to_dir(parent, in);
+
+			is_unlinked = (parent == dev->del_dir) ||
+					(parent == dev->unlinked_dir);
+
+			if (is_shrink)
+				/* Mark the block */
+				bi->has_shrink_hdr = 1;
+
+			/* Note re hardlinks.
+			 * Since we might scan a hardlink before its equivalent
+			 * object is scanned we put them all in a list.
+			 * After scanning is complete, we should have all the
+			 * objects, so we run through this list and fix up all
+			 * the chains.
+			 */
+
+			switch (in->variant_type) {
+			case YAFFS_OBJECT_TYPE_UNKNOWN:
+				/* Todo got a problem */
+				break;
+			case YAFFS_OBJECT_TYPE_FILE:
+				file_var = &in->variant.file_variant;
+				if (file_var->stored_size < file_size) {
+					/* This covers the case where the file
+					 * size is greater than the data held.
+					 * This will happen if the file is
+					 * resized to be larger than its
+					 * current data extents.
+					 */
+					file_var->file_size = file_size;
+					file_var->stored_size = file_size;
+				}
+
+				if (file_var->shrink_size > file_size)
+					file_var->shrink_size = file_size;
+
+				break;
+			case YAFFS_OBJECT_TYPE_HARDLINK:
+				hl_var = &in->variant.hardlink_variant;
+				if (!is_unlinked) {
+					hl_var->equiv_id = equiv_id;
+					list_add(&in->hard_links, hard_list);
+				}
+				break;
+			case YAFFS_OBJECT_TYPE_DIRECTORY:
+				/* Do nothing */
+				break;
+			case YAFFS_OBJECT_TYPE_SPECIAL:
+				/* Do nothing */
+				break;
+			case YAFFS_OBJECT_TYPE_SYMLINK:
+				sl_var = &in->variant.symlink_variant;
+				if (oh) {
+					sl_var->alias =
+					    yaffs_clone_str(oh->alias);
+					if (!sl_var->alias)
+						alloc_failed = 1;
+				}
+				break;
+			}
+		}
+	}
+	return alloc_failed ? YAFFS_FAIL : YAFFS_OK;
+}
+
+int yaffs2_scan_backwards(struct yaffs_dev *dev)
+{
+	u32 blk;
+	int block_iter;
+	int start_iter;
+	int end_iter;
+	int n_to_scan = 0;
+	enum yaffs_block_state state;
+	int c;
+	LIST_HEAD(hard_list);
+	struct yaffs_block_info *bi;
+	u32 seq_number;
+	int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
+	u8 *chunk_data;
+	int found_chunks;
+	int alloc_failed = 0;
+	struct yaffs_block_index *block_index = NULL;
+	int alt_block_index = 0;
+	int summary_available;
+
+	yaffs_trace(YAFFS_TRACE_SCAN,
+		"yaffs2_scan_backwards starts  intstartblk %d intendblk %d...",
+		dev->internal_start_block, dev->internal_end_block);
+
+	dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+	block_index =
+		kmalloc(n_blocks * sizeof(struct yaffs_block_index), GFP_NOFS);
+
+	if (!block_index) {
+		block_index =
+		    vmalloc(n_blocks * sizeof(struct yaffs_block_index));
+		alt_block_index = 1;
+	}
+
+	if (!block_index) {
+		yaffs_trace(YAFFS_TRACE_SCAN,
+			"yaffs2_scan_backwards() could not allocate block index!"
+			);
+		return YAFFS_FAIL;
+	}
+
+	dev->blocks_in_checkpt = 0;
+
+	chunk_data = yaffs_get_temp_buffer(dev);
+
+	/* Scan all the blocks to determine their state */
+	bi = dev->block_info;
+	for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
+	     blk++) {
+		yaffs_clear_chunk_bits(dev, blk);
+		bi->pages_in_use = 0;
+		bi->soft_del_pages = 0;
+
+		yaffs_query_init_block_state(dev, blk, &state, &seq_number);
+
+		bi->block_state = state;
+		bi->seq_number = seq_number;
+
+		if (bi->seq_number == YAFFS_SEQUENCE_CHECKPOINT_DATA)
+			bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
+		if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
+			bi->block_state = YAFFS_BLOCK_STATE_DEAD;
+
+		yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
+			"Block scanning block %d state %d seq %d",
+			blk, bi->block_state, seq_number);
+
+		if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
+			dev->blocks_in_checkpt++;
+
+		} else if (bi->block_state == YAFFS_BLOCK_STATE_DEAD) {
+			yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
+				"block %d is bad", blk);
+		} else if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
+			yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
+			dev->n_erased_blocks++;
+			dev->n_free_chunks += dev->param.chunks_per_block;
+		} else if (bi->block_state ==
+				YAFFS_BLOCK_STATE_NEEDS_SCAN) {
+			/* Determine the highest sequence number */
+			if (seq_number >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
+			    seq_number < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
+				block_index[n_to_scan].seq = seq_number;
+				block_index[n_to_scan].block = blk;
+				n_to_scan++;
+				if (seq_number >= dev->seq_number)
+					dev->seq_number = seq_number;
+			} else {
+				/* TODO: Nasty sequence number! */
+				yaffs_trace(YAFFS_TRACE_SCAN,
+					"Block scanning block %d has bad sequence number %d",
+					blk, seq_number);
+			}
+		}
+		bi++;
+	}
+
+	yaffs_trace(YAFFS_TRACE_ALWAYS, "%d blocks to be sorted...", n_to_scan);
+
+	cond_resched();
+
+	/* Sort the blocks by sequence number */
+	sort(block_index, n_to_scan, sizeof(struct yaffs_block_index),
+		   yaffs2_ybicmp, NULL);
+
+	cond_resched();
+
+	yaffs_trace(YAFFS_TRACE_SCAN, "...done");
+
+	/* Now scan the blocks looking at the data. */
+	start_iter = 0;
+	end_iter = n_to_scan - 1;
+	yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "%d blocks to scan", n_to_scan);
+
+	/* For each block.... backwards */
+	for (block_iter = end_iter;
+	     !alloc_failed && block_iter >= start_iter;
+	     block_iter--) {
+		/* Cooperative multitasking! This loop can run for so
+		   long that watchdog timers expire. */
+		cond_resched();
+
+		/* get the block to scan in the correct order */
+		blk = block_index[block_iter].block;
+		bi = yaffs_get_block_info(dev, blk);
+
+		summary_available = yaffs_summary_read(dev, dev->sum_tags, blk);
+
+		/* For each chunk in each block that needs scanning.... */
+		found_chunks = 0;
+		if (summary_available)
+			c = dev->chunks_per_summary - 1;
+		else
+			c = dev->param.chunks_per_block - 1;
+
+		for (/* c is already initialised */;
+		     !alloc_failed && c >= 0 &&
+		     (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
+		      bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING);
+		      c--) {
+			/* Scan backwards...
+			 * Read the tags and decide what to do
+			 */
+			if (yaffs2_scan_chunk(dev, bi, blk, c,
+					&found_chunks, chunk_data,
+					&hard_list, summary_available) ==
+					YAFFS_FAIL)
+				alloc_failed = 1;
+		}
+
+		if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN) {
+			/* If we got this far while scanning, then the block
+			 * is fully allocated. */
+			bi->block_state = YAFFS_BLOCK_STATE_FULL;
+		}
+
+		/* Now let's see if it was dirty */
+		if (bi->pages_in_use == 0 &&
+		    !bi->has_shrink_hdr &&
+		    bi->block_state == YAFFS_BLOCK_STATE_FULL) {
+			yaffs_block_became_dirty(dev, blk);
+		}
+	}
+
+	yaffs_skip_rest_of_block(dev);
+
+	if (alt_block_index)
+		vfree(block_index);
+	else
+		kfree(block_index);
+
+	/* Ok, we've done all the scanning.
+	 * Fix up the hard link chains.
+	 * We have scanned all the objects, now it's time to add these
+	 * hardlinks.
+	 */
+	yaffs_link_fixup(dev, &hard_list);
+
+	yaffs_release_temp_buffer(dev, chunk_data);
+
+	if (alloc_failed)
+		return YAFFS_FAIL;
+
+	yaffs_trace(YAFFS_TRACE_SCAN, "yaffs2_scan_backwards ends");
+
+	return YAFFS_OK;
+}
diff -uNr linux-4.13.3/fs/yaffs2/yaffs_yaffs2.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_yaffs2.h
--- linux-4.13.3/fs/yaffs2/yaffs_yaffs2.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yaffs_yaffs2.h	2018-01-10 15:09:56.577935391 +0800
@@ -0,0 +1,39 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_YAFFS2_H__
+#define __YAFFS_YAFFS2_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev);
+void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev);
+void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev,
+				   struct yaffs_block_info *bi);
+void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no,
+				    struct yaffs_block_info *bi);
+int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi);
+u32 yaffs2_find_refresh_block(struct yaffs_dev *dev);
+int yaffs2_checkpt_required(struct yaffs_dev *dev);
+int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev);
+
+void yaffs2_checkpt_invalidate(struct yaffs_dev *dev);
+int yaffs2_checkpt_save(struct yaffs_dev *dev);
+int yaffs2_checkpt_restore(struct yaffs_dev *dev);
+
+int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size);
+int yaffs2_scan_backwards(struct yaffs_dev *dev);
+
+#endif
diff -uNr linux-4.13.3/fs/yaffs2/yportenv.h /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yportenv.h
--- linux-4.13.3/fs/yaffs2/yportenv.h	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/fs/yaffs2/yportenv.h	2018-01-10 15:09:56.573935500 +0800
@@ -0,0 +1,85 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2011 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YPORTENV_H__
+#define __YPORTENV_H__
+
+/*
+ * Define the MTD version in terms of Linux Kernel versions
+ * This allows yaffs to be used independantly of the kernel
+ * as well as with it.
+ */
+
+#define MTD_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
+
+#ifdef YAFFS_OUT_OF_TREE
+#include "moduleconfig.h"
+#endif
+
+#include <linux/version.h>
+#define MTD_VERSION_CODE LINUX_VERSION_CODE
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
+#include <linux/config.h>
+#endif
+#include <linux/version.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/xattr.h>
+#include <linux/list.h>
+#include <linux/types.h>
+#include <linux/fs.h>
+#include <linux/stat.h>
+#include <linux/sort.h>
+#include <linux/bitops.h>
+
+/*  These type wrappings are used to support Unicode names in WinCE. */
+#define YCHAR char
+#define YUCHAR unsigned char
+#define _Y(x)     x
+
+#define YAFFS_LOSTNFOUND_NAME		"lost+found"
+#define YAFFS_LOSTNFOUND_PREFIX		"obj"
+
+
+#define YAFFS_ROOT_MODE			0755
+#define YAFFS_LOSTNFOUND_MODE		0700
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+#define Y_CURRENT_TIME current_kernel_time().tv_sec
+#define Y_TIME_CONVERT(x) (x).tv_sec
+#else
+#define Y_CURRENT_TIME current_kernel_time()
+#define Y_TIME_CONVERT(x) (x)
+#endif
+
+#define compile_time_assertion(assertion) \
+	({ int x = __builtin_choose_expr(assertion, 0, (void)0); (void) x; })
+
+
+#define yaffs_printf(msk, fmt, ...) \
+	printk(KERN_DEBUG "yaffs: " fmt "\n", ##__VA_ARGS__)
+
+#define yaffs_trace(msk, fmt, ...) do { \
+	if (yaffs_trace_mask & (msk)) \
+		printk(KERN_DEBUG "yaffs: " fmt "\n", ##__VA_ARGS__); \
+} while (0)
+
+
+#endif
diff -uNr linux-4.13.3/_register /home/hyq/projects/embed/stm32/linux-4.13.3/_register
--- linux-4.13.3/_register	1970-01-01 08:00:00.000000000 +0800
+++ /home/hyq/projects/embed/stm32/linux-4.13.3/_register	2018-01-10 15:09:39.698396462 +0800
@@ -0,0 +1,345 @@
+[36m/*[m
+[36m * Fixed MDIO bus (MDIO bus emulation with fixed PHYs)[m
+[36m *[m
+[36m * Author: Vitaly Bordug [m[04;34m<vbordug@ru.mvista.com>[m
+[36m *         Anton Vorontsov [m[04;34m<avorontsov@ru.mvista.com>[m
+[36m *[m
+[36m * Copyright (c) 2006-2007 MontaVista Software, Inc.[m
+[36m *[m
+[36m * This program is free software; you can redistribute  it and/or modify it[m
+[36m * under  the terms of  the GNU General  Public License as published by the[m
+[36m * Free Software Foundation;  either version 2 of the  License, or (at your[m
+[36m * option) any later version.[m
+[36m */[m
+
+[01;34m#include[m [31m<linux/kernel.h>[m
+[01;34m#include[m [31m<linux/module.h>[m
+[01;34m#include[m [31m<linux/platform_device.h>[m
+[01;34m#include[m [31m<linux/list.h>[m
+[01;34m#include[m [31m<linux/mii.h>[m
+[01;34m#include[m [31m<linux/phy.h>[m
+[01;34m#include[m [31m<linux/phy_fixed.h>[m
+[01;34m#include[m [31m<linux/err.h>[m
+[01;34m#include[m [31m<linux/slab.h>[m
+[01;34m#include[m [31m<linux/of.h>[m
+[01;34m#include[m [31m<linux/gpio.h>[m
+[01;34m#include[m [31m<linux/seqlock.h>[m
+[01;34m#include[m [31m<linux/idr.h>[m
+
+[01;34m#include[m [31m"swphy.h"[m
+
+[01;34mstruct[m [32mfixed_mdio_bus[m [31m{[m
+	[01;34mstruct[m [32mmii_bus[m [31m*[mmii_bus[31m;[m
+	[01;34mstruct[m [32mlist_head[m phys[31m;[m
+[31m}[m[31m;[m
+
+[01;34mstruct[m [32mfixed_phy[m [31m{[m
+	[32mint[m addr[31m;[m
+	[01;34mstruct[m [32mphy_device[m [31m*[mphydev[31m;[m
+	seqcount_t seqcount[31m;[m
+	[01;34mstruct[m [32mfixed_phy_status[m status[31m;[m
+	[32mint[m [31m(*[mlink_update[31m)([m[01;34mstruct[m [32mnet_device[m [31m*,[m [01;34mstruct[m [32mfixed_phy_status[m [31m*);[m
+	[01;34mstruct[m [32mlist_head[m node[31m;[m
+	[32mint[m link_gpio[31m;[m
+[31m}[m[31m;[m
+
+[01;34mstatic[m [01;34mstruct[m [32mplatform_device[m [31m*[mpdev[31m;[m
+[01;34mstatic[m [01;34mstruct[m [32mfixed_mdio_bus[m platform_fmb [31m=[m [31m{[m
+	[31m.[mphys [31m=[m [01;30mLIST_HEAD_INIT[m[31m([mplatform_fmb[31m.[mphys[31m),[m
+[31m}[m[31m;[m
+
+[01;34mstatic[m [32mvoid[m [01;30mfixed_phy_update[m[31m([m[01;34mstruct[m [32mfixed_phy[m [31m*[mfp[31m)[m
+[31m{[m
+	[01;34mif[m [31m([m[01;30mgpio_is_valid[m[31m([mfp[31m->[mlink_gpio[31m))[m
+		fp[31m->[mstatus[31m.[mlink [31m=[m [31m!![m[01;30mgpio_get_value_cansleep[m[31m([mfp[31m->[mlink_gpio[31m);[m
+[31m}[m
+
+[01;34mstatic[m [32mint[m [01;30mfixed_mdio_read[m[31m([m[01;34mstruct[m [32mmii_bus[m [31m*[mbus[31m,[m [32mint[m phy_addr[31m,[m [32mint[m reg_num[31m)[m
+[31m{[m
+	[01;34mstruct[m [32mfixed_mdio_bus[m [31m*[mfmb [31m=[m bus[31m->[mpriv[31m;[m
+	[01;34mstruct[m [32mfixed_phy[m [31m*[mfp[31m;[m
+
+	[01;30mlist_for_each_entry[m[31m([mfp[31m,[m [31m&[mfmb[31m->[mphys[31m,[m node[31m)[m [31m{[m
+		[01;34mif[m [31m([mfp[31m->[maddr [31m==[m phy_addr[31m)[m [31m{[m
+			[01;34mstruct[m [32mfixed_phy_status[m state[31m;[m
+			[32mint[m s[31m;[m
+
+			[01;34mdo[m [31m{[m
+				s [31m=[m [01;30mread_seqcount_begin[m[31m(&[mfp[31m->[mseqcount[31m);[m
+				[36m/* Issue callback if user registered it. */[m
+				[01;34mif[m [31m([mfp[31m->[mlink_update[31m)[m [31m{[m
+					fp[31m->[m[01;30mlink_update[m[31m([mfp[31m->[mphydev[31m->[mattached_dev[31m,[m
+							[31m&[mfp[31m->[mstatus[31m);[m
+					[01;30mfixed_phy_update[m[31m([mfp[31m);[m
+				[31m}[m
+				state [31m=[m fp[31m->[mstatus[31m;[m
+			[31m}[m [01;34mwhile[m [31m([m[01;30mread_seqcount_retry[m[31m(&[mfp[31m->[mseqcount[31m,[m s[31m));[m
+
+			[01;34mreturn[m [01;30mswphy_read_reg[m[31m([mreg_num[31m,[m [31m&[mstate[31m);[m
+		[31m}[m
+	[31m}[m
+
+	[01;34mreturn[m [35m0xFFFF[m[31m;[m
+[31m}[m
+
+[01;34mstatic[m [32mint[m [01;30mfixed_mdio_write[m[31m([m[01;34mstruct[m [32mmii_bus[m [31m*[mbus[31m,[m [32mint[m phy_addr[31m,[m [32mint[m reg_num[31m,[m
+			    u16 val[31m)[m
+[31m{[m
+	[01;34mreturn[m [35m0[m[31m;[m
+[31m}[m
+
+[36m/*[m
+[36m * If something weird is required to be done with link/speed,[m
+[36m * network driver is able to assign a function to implement this.[m
+[36m * May be useful for PHY's that need to be software-driven.[m
+[36m */[m
+[32mint[m [01;30mfixed_phy_set_link_update[m[31m([m[01;34mstruct[m [32mphy_device[m [31m*[mphydev[31m,[m
+			      [32mint[m [31m(*[mlink_update[31m)([m[01;34mstruct[m [32mnet_device[m [31m*,[m
+						 [01;34mstruct[m [32mfixed_phy_status[m [31m*))[m
+[31m{[m
+	[01;34mstruct[m [32mfixed_mdio_bus[m [31m*[mfmb [31m=[m [31m&[mplatform_fmb[31m;[m
+	[01;34mstruct[m [32mfixed_phy[m [31m*[mfp[31m;[m
+
+	[01;34mif[m [31m(![mphydev [31m||[m [31m![mphydev[31m->[mmdio[31m.[mbus[31m)[m
+		[01;34mreturn[m [31m-[mEINVAL[31m;[m
+
+	[01;30mlist_for_each_entry[m[31m([mfp[31m,[m [31m&[mfmb[31m->[mphys[31m,[m node[31m)[m [31m{[m
+		[01;34mif[m [31m([mfp[31m->[maddr [31m==[m phydev[31m->[mmdio[31m.[maddr[31m)[m [31m{[m
+			fp[31m->[mlink_update [31m=[m link_update[31m;[m
+			fp[31m->[mphydev [31m=[m phydev[31m;[m
+			[01;34mreturn[m [35m0[m[31m;[m
+		[31m}[m
+	[31m}[m
+
+	[01;34mreturn[m [31m-[mENOENT[31m;[m
+[31m}[m
+[01;30mEXPORT_SYMBOL_GPL[m[31m([mfixed_phy_set_link_update[31m);[m
+
+[32mint[m [01;30mfixed_phy_update_state[m[31m([m[01;34mstruct[m [32mphy_device[m [31m*[mphydev[31m,[m
+			   [01;34mconst[m [01;34mstruct[m [32mfixed_phy_status[m [31m*[mstatus[31m,[m
+			   [01;34mconst[m [01;34mstruct[m [32mfixed_phy_status[m [31m*[mchanged[31m)[m
+[31m{[m
+	[01;34mstruct[m [32mfixed_mdio_bus[m [31m*[mfmb [31m=[m [31m&[mplatform_fmb[31m;[m
+	[01;34mstruct[m [32mfixed_phy[m [31m*[mfp[31m;[m
+
+	[01;34mif[m [31m(![mphydev [31m||[m phydev[31m->[mmdio[31m.[mbus [31m!=[m fmb[31m->[mmii_bus[31m)[m
+		[01;34mreturn[m [31m-[mEINVAL[31m;[m
+
+	[01;30mlist_for_each_entry[m[31m([mfp[31m,[m [31m&[mfmb[31m->[mphys[31m,[m node[31m)[m [31m{[m
+		[01;34mif[m [31m([mfp[31m->[maddr [31m==[m phydev[31m->[mmdio[31m.[maddr[31m)[m [31m{[m
+			[01;30mwrite_seqcount_begin[m[31m(&[mfp[31m->[mseqcount[31m);[m
+[01;34m#define[m [01;30m_UPD[m[31m([mx[31m)[m [01;34mif[m [31m([mchanged[31m->[mx[31m)[m [31m\[m
+	fp[31m->[mstatus[31m.[mx [31m=[m status[31m->[mx
+			[01;30m_UPD[m[31m([mlink[31m);[m
+			[01;30m_UPD[m[31m([mspeed[31m);[m
+			[01;30m_UPD[m[31m([mduplex[31m);[m
+			[01;30m_UPD[m[31m([mpause[31m);[m
+			[01;30m_UPD[m[31m([masym_pause[31m);[m
+[01;34m#undef[m _UPD
+			[01;30mfixed_phy_update[m[31m([mfp[31m);[m
+			[01;30mwrite_seqcount_end[m[31m(&[mfp[31m->[mseqcount[31m);[m
+			[01;34mreturn[m [35m0[m[31m;[m
+		[31m}[m
+	[31m}[m
+
+	[01;34mreturn[m [31m-[mENOENT[31m;[m
+[31m}[m
+[01;30mEXPORT_SYMBOL[m[31m([mfixed_phy_update_state[31m);[m
+
+[32mint[m [01;30mfixed_phy_add[m[31m([m[32munsigned[m [32mint[m irq[31m,[m [32mint[m phy_addr[31m,[m
+		  [01;34mstruct[m [32mfixed_phy_status[m [31m*[mstatus[31m,[m
+		  [32mint[m link_gpio[31m)[m
+[31m{[m
+	[32mint[m ret[31m;[m
+	[01;34mstruct[m [32mfixed_mdio_bus[m [31m*[mfmb [31m=[m [31m&[mplatform_fmb[31m;[m
+	[01;34mstruct[m [32mfixed_phy[m [31m*[mfp[31m;[m
+
+	ret [31m=[m [01;30mswphy_validate_state[m[31m([mstatus[31m);[m
+	[01;34mif[m [31m([mret [31m<[m [35m0[m[31m)[m
+		[01;34mreturn[m ret[31m;[m
+
+	fp [31m=[m [01;30mkzalloc[m[31m([m[01;34msizeof[m[31m(*[mfp[31m),[m GFP_KERNEL[31m);[m
+	[01;34mif[m [31m(![mfp[31m)[m
+		[01;34mreturn[m [31m-[mENOMEM[31m;[m
+
+	[01;30mseqcount_init[m[31m(&[mfp[31m->[mseqcount[31m);[m
+
+	[01;34mif[m [31m([mirq [31m!=[m PHY_POLL[31m)[m
+		fmb[31m->[mmii_bus[31m->[mirq[31m[[mphy_addr[31m][m [31m=[m irq[31m;[m
+
+	fp[31m->[maddr [31m=[m phy_addr[31m;[m
+	fp[31m->[mstatus [31m=[m [31m*[mstatus[31m;[m
+	fp[31m->[mlink_gpio [31m=[m link_gpio[31m;[m
+
+	[01;34mif[m [31m([m[01;30mgpio_is_valid[m[31m([mfp[31m->[mlink_gpio[31m))[m [31m{[m
+		ret [31m=[m [01;30mgpio_request_one[m[31m([mfp[31m->[mlink_gpio[31m,[m GPIOF_DIR_IN[31m,[m
+				       [31m"fixed-link-gpio-link"[m[31m);[m
+		[01;34mif[m [31m([mret[31m)[m
+			[01;34mgoto[m err_regs[31m;[m
+	[31m}[m
+
+	[01;30mfixed_phy_update[m[31m([mfp[31m);[m
+
+	[01;30mlist_add_tail[m[31m(&[mfp[31m->[mnode[31m,[m [31m&[mfmb[31m->[mphys[31m);[m
+
+	[01;34mreturn[m [35m0[m[31m;[m
+
+err_regs[31m:[m
+	[01;30mkfree[m[31m([mfp[31m);[m
+	[01;34mreturn[m ret[31m;[m
+[31m}[m
+[01;30mEXPORT_SYMBOL_GPL[m[31m([mfixed_phy_add[31m);[m
+
+[01;34mstatic[m [01;30mDEFINE_IDA[m[31m([mphy_fixed_ida[31m);[m
+
+[01;34mstatic[m [32mvoid[m [01;30mfixed_phy_del[m[31m([m[32mint[m phy_addr[31m)[m
+[31m{[m
+	[01;34mstruct[m [32mfixed_mdio_bus[m [31m*[mfmb [31m=[m [31m&[mplatform_fmb[31m;[m
+	[01;34mstruct[m [32mfixed_phy[m [31m*[mfp[31m,[m [31m*[mtmp[31m;[m
+
+	[01;30mlist_for_each_entry_safe[m[31m([mfp[31m,[m tmp[31m,[m [31m&[mfmb[31m->[mphys[31m,[m node[31m)[m [31m{[m
+		[01;34mif[m [31m([mfp[31m->[maddr [31m==[m phy_addr[31m)[m [31m{[m
+			[01;30mlist_del[m[31m(&[mfp[31m->[mnode[31m);[m
+			[01;34mif[m [31m([m[01;30mgpio_is_valid[m[31m([mfp[31m->[mlink_gpio[31m))[m
+				[01;30mgpio_free[m[31m([mfp[31m->[mlink_gpio[31m);[m
+			[01;30mkfree[m[31m([mfp[31m);[m
+			[01;30mida_simple_remove[m[31m(&[mphy_fixed_ida[31m,[m phy_addr[31m);[m
+			[01;34mreturn[m[31m;[m
+		[31m}[m
+	[31m}[m
+[31m}[m
+
+[01;34mstruct[m [32mphy_device[m [31m*[m[01;30mfixed_phy_register[m[31m([m[32munsigned[m [32mint[m irq[31m,[m
+				      [01;34mstruct[m [32mfixed_phy_status[m [31m*[mstatus[31m,[m
+				      [32mint[m link_gpio[31m,[m
+				      [01;34mstruct[m [32mdevice_node[m [31m*[mnp[31m)[m
+[31m{[m
+	[01;34mstruct[m [32mfixed_mdio_bus[m [31m*[mfmb [31m=[m [31m&[mplatform_fmb[31m;[m
+	[01;34mstruct[m [32mphy_device[m [31m*[mphy[31m;[m
+	[32mint[m phy_addr[31m;[m
+	[32mint[m ret[31m;[m
+
+	[01;34mif[m [31m(![mfmb[31m->[mmii_bus [31m||[m fmb[31m->[mmii_bus[31m->[mstate [31m!=[m MDIOBUS_REGISTERED[31m)[m
+		[01;34mreturn[m [01;30mERR_PTR[m[31m(-[mEPROBE_DEFER[31m);[m
+
+	[36m/* Get the next available PHY address, up to PHY_MAX_ADDR */[m
+	phy_addr [31m=[m [01;30mida_simple_get[m[31m(&[mphy_fixed_ida[31m,[m [35m0[m[31m,[m PHY_MAX_ADDR[31m,[m GFP_KERNEL[31m);[m
+	[01;34mif[m [31m([mphy_addr [31m<[m [35m0[m[31m)[m
+		[01;34mreturn[m [01;30mERR_PTR[m[31m([mphy_addr[31m);[m
+
+	ret [31m=[m [01;30mfixed_phy_add[m[31m([mirq[31m,[m phy_addr[31m,[m status[31m,[m link_gpio[31m);[m
+	[01;34mif[m [31m([mret [31m<[m [35m0[m[31m)[m [31m{[m
+		[01;30mida_simple_remove[m[31m(&[mphy_fixed_ida[31m,[m phy_addr[31m);[m
+		[01;34mreturn[m [01;30mERR_PTR[m[31m([mret[31m);[m
+	[31m}[m
+
+	phy [31m=[m [01;30mget_phy_device[m[31m([mfmb[31m->[mmii_bus[31m,[m phy_addr[31m,[m false[31m);[m
+	[01;34mif[m [31m([m[01;30mIS_ERR[m[31m([mphy[31m))[m [31m{[m
+		[01;30mfixed_phy_del[m[31m([mphy_addr[31m);[m
+		[01;34mreturn[m [01;30mERR_PTR[m[31m(-[mEINVAL[31m);[m
+	[31m}[m
+
+	[36m/* propagate the fixed link values to struct phy_device */[m
+	phy[31m->[mlink [31m=[m status[31m->[mlink[31m;[m
+	[01;34mif[m [31m([mstatus[31m->[mlink[31m)[m [31m{[m
+		phy[31m->[mspeed [31m=[m status[31m->[mspeed[31m;[m
+		phy[31m->[mduplex [31m=[m status[31m->[mduplex[31m;[m
+		phy[31m->[mpause [31m=[m status[31m->[mpause[31m;[m
+		phy[31m->[masym_pause [31m=[m status[31m->[masym_pause[31m;[m
+	[31m}[m
+
+	[01;30mof_node_get[m[31m([mnp[31m);[m
+	phy[31m->[mmdio[31m.[mdev[31m.[mof_node [31m=[m np[31m;[m
+	phy[31m->[mis_pseudo_fixed_link [31m=[m true[31m;[m
+
+	[01;34mswitch[m [31m([mstatus[31m->[mspeed[31m)[m [31m{[m
+	[01;34mcase[m SPEED_1000[31m:[m
+		phy[31m->[msupported [31m=[m PHY_1000BT_FEATURES[31m;[m
+		[01;34mbreak[m[31m;[m
+	[01;34mcase[m SPEED_100[31m:[m
+		phy[31m->[msupported [31m=[m PHY_100BT_FEATURES[31m;[m
+		[01;34mbreak[m[31m;[m
+	[01;34mcase[m SPEED_10[31m:[m
+[01;34m	default:[m
+		phy[31m->[msupported [31m=[m PHY_10BT_FEATURES[31m;[m
+	[31m}[m
+
+	ret [31m=[m [01;30mphy_device_register[m[31m([mphy[31m);[m
+	[01;34mif[m [31m([mret[31m)[m [31m{[m
+		[01;30mphy_device_free[m[31m([mphy[31m);[m
+		[01;30mof_node_put[m[31m([mnp[31m);[m
+		[01;30mfixed_phy_del[m[31m([mphy_addr[31m);[m
+		[01;34mreturn[m [01;30mERR_PTR[m[31m([mret[31m);[m
+	[31m}[m
+
+	[01;34mreturn[m phy[31m;[m
+[31m}[m
+[01;30mEXPORT_SYMBOL_GPL[m[31m([mfixed_phy_register[31m);[m
+
+[32mvoid[m [01;30mfixed_phy_unregister[m[31m([m[01;34mstruct[m [32mphy_device[m [31m*[mphy[31m)[m
+[31m{[m
+	[01;30mphy_device_remove[m[31m([mphy[31m);[m
+	[01;30mof_node_put[m[31m([mphy[31m->[mmdio[31m.[mdev[31m.[mof_node[31m);[m
+	[01;30mfixed_phy_del[m[31m([mphy[31m->[mmdio[31m.[maddr[31m);[m
+[31m}[m
+[01;30mEXPORT_SYMBOL_GPL[m[31m([mfixed_phy_unregister[31m);[m
+
+[01;34mstatic[m [32mint[m __init [01;30mfixed_mdio_bus_init[m[31m([m[32mvoid[m[31m)[m
+[31m{[m
+	[01;34mstruct[m [32mfixed_mdio_bus[m [31m*[mfmb [31m=[m [31m&[mplatform_fmb[31m;[m
+	[32mint[m ret[31m;[m
+
+	pdev [31m=[m [01;30mplatform_device_register_simple[m[31m([m[31m"Fixed MDIO bus"[m[31m,[m [35m0[m[31m,[m NULL[31m,[m [35m0[m[31m);[m
+	[01;34mif[m [31m([m[01;30mIS_ERR[m[31m([mpdev[31m))[m [31m{[m
+		ret [31m=[m [01;30mPTR_ERR[m[31m([mpdev[31m);[m
+		[01;34mgoto[m err_pdev[31m;[m
+	[31m}[m
+
+	fmb[31m->[mmii_bus [31m=[m [01;30mmdiobus_alloc[m[31m();[m
+	[01;34mif[m [31m([mfmb[31m->[mmii_bus [31m==[m NULL[31m)[m [31m{[m
+		ret [31m=[m [31m-[mENOMEM[31m;[m
+		[01;34mgoto[m err_mdiobus_reg[31m;[m
+	[31m}[m
+
+	[01;30msnprintf[m[31m([mfmb[31m->[mmii_bus[31m->[mid[31m,[m MII_BUS_ID_SIZE[31m,[m [31m"fixed-0"[m[31m);[m
+	fmb[31m->[mmii_bus[31m->[mname [31m=[m [31m"Fixed MDIO Bus"[m[31m;[m
+	fmb[31m->[mmii_bus[31m->[mpriv [31m=[m fmb[31m;[m
+	fmb[31m->[mmii_bus[31m->[mparent [31m=[m [31m&[mpdev[31m->[mdev[31m;[m
+	fmb[31m->[mmii_bus[31m->[mread [31m=[m [31m&[mfixed_mdio_read[31m;[m
+	fmb[31m->[mmii_bus[31m->[mwrite [31m=[m [31m&[mfixed_mdio_write[31m;[m
+
+	ret [31m=[m [01;30mmdiobus_register[m[31m([mfmb[31m->[mmii_bus[31m);[m
+	[01;34mif[m [31m([mret[31m)[m
+		[01;34mgoto[m err_mdiobus_alloc[31m;[m
+
+	[01;34mreturn[m [35m0[m[31m;[m
+
+err_mdiobus_alloc[31m:[m
+	[01;30mmdiobus_free[m[31m([mfmb[31m->[mmii_bus[31m);[m
+err_mdiobus_reg[31m:[m
+	[01;30mplatform_device_unregister[m[31m([mpdev[31m);[m
+err_pdev[31m:[m
+	[01;34mreturn[m ret[31m;[m
+[31m}[m
+[01;30mmodule_init[m[31m([mfixed_mdio_bus_init[31m);[m
+
+[01;34mstatic[m [32mvoid[m __exit [01;30mfixed_mdio_bus_exit[m[31m([m[32mvoid[m[31m)[m
+[31m{[m
+	[01;34mstruct[m [32mfixed_mdio_bus[m [31m*[mfmb [31m=[m [31m&[mplatform_fmb[31m;[m
+	[01;34mstruct[m [32mfixed_phy[m [31m*[mfp[31m,[m [31m*[mtmp[31m;[m
+
+	[01;30mmdiobus_unregister[m[31m([mfmb[31m->[mmii_bus[31m);[m
+	[01;30mmdiobus_free[m[31m([mfmb[31m->[mmii_bus[31m);[m
+	[01;30mplatform_device_unregister[m[31m([mpdev[31m);[m
+
+	[01;30mlist_for_each_entry_safe[m[31m([mfp[31m,[m tmp[31m,[m [31m&[mfmb[31m->[mphys[31m,[m node[31m)[m [31m{[m
+		[01;30mlist_del[m[31m(&[mfp[31m->[mnode[31m);[m
+		[01;30mkfree[m[31m([mfp[31m);[m
+	[31m}[m
+	[01;30mida_destroy[m[31m(&[mphy_fixed_ida[31m);[m
+[31m}[m
+[01;30mmodule_exit[m[31m([mfixed_mdio_bus_exit[31m);[m
+
+[01;30mMODULE_DESCRIPTION[m[31m([m[31m"Fixed MDIO bus (MDIO bus emulation with fixed PHYs)"[m[31m);[m
+[01;30mMODULE_AUTHOR[m[31m([m[31m"Vitaly Bordug"[m[31m);[m
+[01;30mMODULE_LICENSE[m[31m([m[31m"GPL"[m[31m);[m
 
