r1239 - trunk/src/target/kernel/patches
laforge at sita.openmoko.org
laforge at sita.openmoko.org
Sun Mar 4 16:18:05 CET 2007
Author: laforge
Date: 2007-03-04 16:18:04 +0100 (Sun, 04 Mar 2007)
New Revision: 1239
Added:
trunk/src/target/kernel/patches/s3c2410_nand-hwecc-backport.patch
trunk/src/target/kernel/patches/yaffs2-20070304.patch
Modified:
trunk/src/target/kernel/patches/series
Log:
* move SDHC backport further up in series
* add YAFFS2 (for experimenting)
* add Hardware ECC correction for S3C2410 NAND from 2.6.21-rcX
Added: trunk/src/target/kernel/patches/s3c2410_nand-hwecc-backport.patch
===================================================================
--- trunk/src/target/kernel/patches/s3c2410_nand-hwecc-backport.patch 2007-03-04 15:15:01 UTC (rev 1238)
+++ trunk/src/target/kernel/patches/s3c2410_nand-hwecc-backport.patch 2007-03-04 15:18:04 UTC (rev 1239)
@@ -0,0 +1,130 @@
+From: Ben Dooks <ben-linux at fluff.org>
+Date: Fri, 2 Feb 2007 16:59:33 +0000 (+0000)
+Subject: [MTD] [NAND] S3C2410: Hardware ECC correction code
+X-Git-Tag: v2.6.21-rc1^0~66^2~13
+X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=a2593247d747954cd12c32da8c5a3aecb9cd19a3
+
+[MTD] [NAND] S3C2410: Hardware ECC correction code
+
+Add support for correcting errors detected by the
+hardware ECC.
+
+Signed-off-by: Ben Dooks <ben-linux at fluff.org>
+Signed-off-by: David Woodhouse <dwmw2 at infradead.org>
+---
+
+diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
+index 9326a56..143a7f0 100644
+--- a/drivers/mtd/nand/Kconfig
++++ b/drivers/mtd/nand/Kconfig
+@@ -126,10 +126,6 @@ config MTD_NAND_S3C2410_HWECC
+ incorrect ECC generation, and if using these, the default of
+ software ECC is preferable.
+
+- If you lay down a device with the hardware ECC, then you will
+- currently not be able to switch to software, as there is no
+- implementation for ECC method used by the S3C2410
+-
+ config MTD_NAND_NDFC
+ tristate "NDFC NanD Flash Controller"
+ depends on MTD_NAND && 44x
+diff --git a/drivers/mtd/nand/s3c2410.c b/drivers/mtd/nand/s3c2410.c
+index 8b32035..e8e0301 100644
+--- a/drivers/mtd/nand/s3c2410.c
++++ b/drivers/mtd/nand/s3c2410.c
+@@ -337,17 +337,69 @@ static int s3c2412_nand_devready(struct mtd_info *mtd)
+ static int s3c2410_nand_correct_data(struct mtd_info *mtd, u_char *dat,
+ u_char *read_ecc, u_char *calc_ecc)
+ {
+- pr_debug("s3c2410_nand_correct_data(%p,%p,%p,%p)\n", mtd, dat, read_ecc, calc_ecc);
++ struct s3c2410_nand_info *info = s3c2410_nand_mtd_toinfo(mtd);
++ unsigned int diff0, diff1, diff2;
++ unsigned int bit, byte;
+
+- pr_debug("eccs: read %02x,%02x,%02x vs calc %02x,%02x,%02x\n",
+- read_ecc[0], read_ecc[1], read_ecc[2], calc_ecc[0], calc_ecc[1], calc_ecc[2]);
++ pr_debug("%s(%p,%p,%p,%p)\n", __func__, mtd, dat, read_ecc, calc_ecc);
+
+- if (read_ecc[0] == calc_ecc[0] && read_ecc[1] == calc_ecc[1] && read_ecc[2] == calc_ecc[2])
+- return 0;
++ diff0 = read_ecc[0] ^ calc_ecc[0];
++ diff1 = read_ecc[1] ^ calc_ecc[1];
++ diff2 = read_ecc[2] ^ calc_ecc[2];
++
++ pr_debug("%s: rd %02x%02x%02x calc %02x%02x%02x diff %02x%02x%02x\n",
++ __func__,
++ read_ecc[0], read_ecc[1], read_ecc[2],
++ calc_ecc[0], calc_ecc[1], calc_ecc[2],
++ diff0, diff1, diff2);
++
++ if (diff0 == 0 && diff1 == 0 && diff2 == 0)
++ return 0; /* ECC is ok */
++
++ /* Can we correct this ECC (ie, one row and column change).
++ * Note, this is similar to the 256 error code on smartmedia */
++
++ if (((diff0 ^ (diff0 >> 1)) & 0x55) == 0x55 &&
++ ((diff1 ^ (diff1 >> 1)) & 0x55) == 0x55 &&
++ ((diff2 ^ (diff2 >> 1)) & 0x55) == 0x55) {
++ /* calculate the bit position of the error */
++
++ bit = (diff2 >> 2) & 1;
++ bit |= (diff2 >> 3) & 2;
++ bit |= (diff2 >> 4) & 4;
++
++ /* calculate the byte position of the error */
++
++ byte = (diff1 << 1) & 0x80;
++ byte |= (diff1 << 2) & 0x40;
++ byte |= (diff1 << 3) & 0x20;
++ byte |= (diff1 << 4) & 0x10;
+
+- /* we curently have no method for correcting the error */
++ byte |= (diff0 >> 3) & 0x08;
++ byte |= (diff0 >> 2) & 0x04;
++ byte |= (diff0 >> 1) & 0x02;
++ byte |= (diff0 >> 0) & 0x01;
+
+- return -1;
++ byte |= (diff2 << 8) & 0x100;
++
++ dev_dbg(info->device, "correcting error bit %d, byte %d\n",
++ bit, byte);
++
++ dat[byte] ^= (1 << bit);
++ return 1;
++ }
++
++ /* if there is only one bit difference in the ECC, then
++ * one of only a row or column parity has changed, which
++ * means the error is most probably in the ECC itself */
++
++ diff0 |= (diff1 << 8);
++ diff0 |= (diff2 << 16);
++
++ if ((diff0 & ~(1<<fls(diff0))) == 0)
++ return 1;
++
++ return 0;
+ }
+
+ /* ECC functions
+@@ -383,7 +435,8 @@ static int s3c2410_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u
+ ecc_code[1] = readb(info->regs + S3C2410_NFECC + 1);
+ ecc_code[2] = readb(info->regs + S3C2410_NFECC + 2);
+
+- pr_debug("calculate_ecc: returning ecc %02x,%02x,%02x\n", ecc_code[0], ecc_code[1], ecc_code[2]);
++ pr_debug("%s: returning ecc %02x%02x%02x\n", __func__,
++ ecc_code[0], ecc_code[1], ecc_code[2]);
+
+ return 0;
+ }
+@@ -397,7 +450,7 @@ static int s3c2440_nand_calculate_ecc(struct mtd_info *mtd, const u_char *dat, u
+ ecc_code[1] = ecc >> 8;
+ ecc_code[2] = ecc >> 16;
+
+- pr_debug("calculate_ecc: returning ecc %02x,%02x,%02x\n", ecc_code[0], ecc_code[1], ecc_code[2]);
++ pr_debug("%s: returning ecc %06x\n", __func__, ecc);
+
+ return 0;
+ }
Modified: trunk/src/target/kernel/patches/series
===================================================================
--- trunk/src/target/kernel/patches/series 2007-03-04 15:15:01 UTC (rev 1238)
+++ trunk/src/target/kernel/patches/series 2007-03-04 15:18:04 UTC (rev 1239)
@@ -1,6 +1,9 @@
asoc.patch
asoc-asm_hardware_h.patch
asoc-platform-hw_init-pcm_emulation-fix.patch
+sdhc-backport.patch
+s3c2410_nand-hwecc-backport.patch
+yaffs2-20070304.patch
i2c-permit_invalid_addrs.patch
pm-debug_less_verbose.patch
g_ether-highpower.patch
@@ -33,4 +36,3 @@
ts0710.patch
s3c2410-qt2410-buttons.patch
config-nr-tty-devices.patch
-sdhc-backport.patch
Added: trunk/src/target/kernel/patches/yaffs2-20070304.patch
===================================================================
--- trunk/src/target/kernel/patches/yaffs2-20070304.patch 2007-03-04 15:15:01 UTC (rev 1238)
+++ trunk/src/target/kernel/patches/yaffs2-20070304.patch 2007-03-04 15:18:04 UTC (rev 1239)
@@ -0,0 +1,13184 @@
+Index: linux-2.6.20.1/fs/Kconfig
+===================================================================
+--- linux-2.6.20.1.orig/fs/Kconfig 2007-02-04 19:44:54.000000000 +0100
++++ linux-2.6.20.1/fs/Kconfig 2007-03-04 16:08:19.000000000 +0100
+@@ -1196,6 +1196,10 @@
+ To compile the EFS file system support as a module, choose M here: the
+ module will be called efs.
+
++
++# Patched by YAFFS
++source "fs/yaffs2/Kconfig"
++
+ config JFFS_FS
+ tristate "Journalling Flash File System (JFFS) support"
+ depends on MTD && BLOCK && BROKEN
+Index: linux-2.6.20.1/fs/yaffs2/Kconfig
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/Kconfig 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,159 @@
++#
++# YAFFS file system configurations
++#
++
++config YAFFS_FS
++ tristate "YAFFS2 file system support"
++ default n
++ depends on MTD
++ select YAFFS_YAFFS1
++ select YAFFS_YAFFS2
++ help
++ YAFFS2, or Yet Another Flash Filing System, is a filing 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_DOES_ECC
++ bool "Lets Yaffs do its own ECC"
++ depends on YAFFS_FS && YAFFS_YAFFS1
++ 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
++ 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_LAZY_LOAD
++ bool "Disable lazy loading"
++ depends on YAFFS_YAFFS2
++ default n
++ help
++ "Lazy loading" defers loading file details until they are
++ required. This saves mount time, but makes the first look-up
++ a bit longer.
++
++ Lazy loading will only happen if enabled by this option being 'n'
++ and if the appropriate tags are available, else yaffs2 will
++ automatically fall back to immediate loading and do the right
++ thing.
++
++ Lazy laoding will be required by checkpointing.
++
++ Setting this to 'y' will disable lazy loading.
++
++ If unsure, say N.
++
++config YAFFS_CHECKPOINT_RESERVED_BLOCKS
++ int "Reserved blocks for checkpointing"
++ depends on YAFFS_YAFFS2
++ default 10
++ help
++ Give the number of Blocks to reserve for checkpointing.
++ Checkpointing saves the state at unmount so that mounting is
++ much faster as a scan of all the flash to regenerate this state
++ is not needed. These Blocks are reserved per partition, so if
++ you have very small partitions the default (10) may be a mess
++ for you. You can set this value to 0, but that does not mean
++ checkpointing is disabled at all. There only won't be any
++ specially reserved blocks for checkpointing, so if there is
++ enough free space on the filesystem, it will be used for
++ checkpointing.
++
++ If unsure, leave at default (10), but don't wonder if there are
++ always 2MB used on your large page device partition (10 x 2k
++ pagesize). When using small partitions or when being very small
++ on space, you probably want to set this to zero.
++
++config YAFFS_DISABLE_WIDE_TNODES
++ bool "Turn off wide tnodes"
++ depends on YAFFS_FS
++ default n
++ help
++ Wide tnodes are only used for NAND arrays >=32MB for 512-byte
++ page devices and >=128MB for 2k page devices. They use slightly
++ more RAM but are faster since they eliminate chunk group
++ searching.
++
++ Setting this to 'y' will force tnode width to 16 bits and save
++ memory but make large arrays slower.
++
++ 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_SHORT_NAMES_IN_RAM
++ bool "Cache short names in RAM"
++ depends on YAFFS_FS
++ default y
++ help
++ If this config is set, then short names are stored with the
++ yaffs_Object. This costs an extra 16 bytes of RAM per object,
++ but makes look-ups faster.
++
++ If unsure, say Y.
+Index: linux-2.6.20.1/fs/yaffs2/Makefile
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/Makefile 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,10 @@
++#
++# Makefile for the linux YAFFS filesystem routines.
++#
++
++obj-$(CONFIG_YAFFS_FS) += yaffs.o
++
++yaffs-y := yaffs_ecc.o yaffs_fs.o yaffs_guts.o yaffs_checkptrw.o
++yaffs-y += yaffs_packedtags2.o yaffs_nand.o yaffs_qsort.o
++yaffs-y += yaffs_tagscompat.o yaffs_tagsvalidity.o
++yaffs-y += yaffs_mtdif.o yaffs_mtdif2.o
+Index: linux-2.6.20.1/fs/yaffs2/devextras.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/devextras.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,264 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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 file is just holds extra declarations used during development.
++ * Most of these are from kernel includes placed here so we can use them in
++ * applications.
++ *
++ */
++
++#ifndef __EXTRAS_H__
++#define __EXTRAS_H__
++
++#if defined WIN32
++#define __inline__ __inline
++#define new newHack
++#endif
++
++#if !(defined __KERNEL__) || (defined WIN32)
++
++/* User space defines */
++
++typedef unsigned char __u8;
++typedef unsigned short __u16;
++typedef unsigned __u32;
++
++/*
++ * Simple doubly linked list implementation.
++ *
++ * Some of the internal functions ("__xxx") are useful when
++ * manipulating whole lists rather than single entries, as
++ * sometimes we already know the next/prev entries and we can
++ * generate better code by using them directly rather than
++ * using the generic single-entry routines.
++ */
++
++#define prefetch(x) 1
++
++struct list_head {
++ struct list_head *next, *prev;
++};
++
++#define LIST_HEAD_INIT(name) { &(name), &(name) }
++
++#define LIST_HEAD(name) \
++ struct list_head name = LIST_HEAD_INIT(name)
++
++#define INIT_LIST_HEAD(ptr) do { \
++ (ptr)->next = (ptr); (ptr)->prev = (ptr); \
++} while (0)
++
++/*
++ * Insert a new entry between two known consecutive entries.
++ *
++ * This is only for internal list manipulation where we know
++ * the prev/next entries already!
++ */
++static __inline__ void __list_add(struct list_head *new,
++ struct list_head *prev,
++ struct list_head *next)
++{
++ next->prev = new;
++ new->next = next;
++ new->prev = prev;
++ prev->next = new;
++}
++
++/**
++ * list_add - add a new entry
++ * @new: new entry to be added
++ * @head: list head to add it after
++ *
++ * Insert a new entry after the specified head.
++ * This is good for implementing stacks.
++ */
++static __inline__ void list_add(struct list_head *new, struct list_head *head)
++{
++ __list_add(new, head, head->next);
++}
++
++/**
++ * list_add_tail - add a new entry
++ * @new: new entry to be added
++ * @head: list head to add it before
++ *
++ * Insert a new entry before the specified head.
++ * This is useful for implementing queues.
++ */
++static __inline__ void list_add_tail(struct list_head *new,
++ struct list_head *head)
++{
++ __list_add(new, head->prev, head);
++}
++
++/*
++ * Delete a list entry by making the prev/next entries
++ * point to each other.
++ *
++ * This is only for internal list manipulation where we know
++ * the prev/next entries already!
++ */
++static __inline__ void __list_del(struct list_head *prev,
++ struct list_head *next)
++{
++ next->prev = prev;
++ prev->next = next;
++}
++
++/**
++ * list_del - deletes entry from list.
++ * @entry: the element to delete from the list.
++ * Note: list_empty on entry does not return true after this, the entry is
++ * in an undefined state.
++ */
++static __inline__ void list_del(struct list_head *entry)
++{
++ __list_del(entry->prev, entry->next);
++}
++
++/**
++ * list_del_init - deletes entry from list and reinitialize it.
++ * @entry: the element to delete from the list.
++ */
++static __inline__ void list_del_init(struct list_head *entry)
++{
++ __list_del(entry->prev, entry->next);
++ INIT_LIST_HEAD(entry);
++}
++
++/**
++ * list_empty - tests whether a list is empty
++ * @head: the list to test.
++ */
++static __inline__ int list_empty(struct list_head *head)
++{
++ return head->next == head;
++}
++
++/**
++ * list_splice - join two lists
++ * @list: the new list to add.
++ * @head: the place to add it in the first list.
++ */
++static __inline__ void list_splice(struct list_head *list,
++ struct list_head *head)
++{
++ struct list_head *first = list->next;
++
++ if (first != list) {
++ struct list_head *last = list->prev;
++ struct list_head *at = head->next;
++
++ first->prev = head;
++ head->next = first;
++
++ last->next = at;
++ at->prev = last;
++ }
++}
++
++/**
++ * list_entry - get the struct for this entry
++ * @ptr: the &struct list_head pointer.
++ * @type: the type of the struct this is embedded in.
++ * @member: the name of the list_struct within the struct.
++ */
++#define list_entry(ptr, type, member) \
++ ((type *)((char *)(ptr)-(unsigned long)(&((type *)0)->member)))
++
++/**
++ * list_for_each - iterate over a list
++ * @pos: the &struct list_head to use as a loop counter.
++ * @head: the head for your list.
++ */
++#define list_for_each(pos, head) \
++ for (pos = (head)->next, prefetch(pos->next); pos != (head); \
++ pos = pos->next, prefetch(pos->next))
++
++/**
++ * list_for_each_safe - iterate over a list safe against removal
++ * of list entry
++ * @pos: the &struct list_head to use as a loop counter.
++ * @n: another &struct list_head to use as temporary storage
++ * @head: the head for your list.
++ */
++#define list_for_each_safe(pos, n, head) \
++ for (pos = (head)->next, n = pos->next; pos != (head); \
++ pos = n, n = pos->next)
++
++/*
++ * File types
++ */
++#define DT_UNKNOWN 0
++#define DT_FIFO 1
++#define DT_CHR 2
++#define DT_DIR 4
++#define DT_BLK 6
++#define DT_REG 8
++#define DT_LNK 10
++#define DT_SOCK 12
++#define DT_WHT 14
++
++#ifndef WIN32
++#include <sys/stat.h>
++#endif
++
++/*
++ * Attribute flags. These should be or-ed together to figure out what
++ * has been changed!
++ */
++#define ATTR_MODE 1
++#define ATTR_UID 2
++#define ATTR_GID 4
++#define ATTR_SIZE 8
++#define ATTR_ATIME 16
++#define ATTR_MTIME 32
++#define ATTR_CTIME 64
++#define ATTR_ATIME_SET 128
++#define ATTR_MTIME_SET 256
++#define ATTR_FORCE 512 /* Not a change, but a change it */
++#define ATTR_ATTR_FLAG 1024
++
++struct iattr {
++ unsigned int ia_valid;
++ unsigned ia_mode;
++ unsigned ia_uid;
++ unsigned ia_gid;
++ unsigned ia_size;
++ unsigned ia_atime;
++ unsigned ia_mtime;
++ unsigned ia_ctime;
++ unsigned int ia_attr_flags;
++};
++
++#define KERN_DEBUG
++
++#else
++
++#ifndef WIN32
++#include <linux/types.h>
++#include <linux/list.h>
++#include <linux/fs.h>
++#include <linux/stat.h>
++#endif
++
++#endif
++
++#if defined WIN32
++#undef new
++#endif
++
++#endif
+Index: linux-2.6.20.1/fs/yaffs2/moduleconfig.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/moduleconfig.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,51 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Martin Fouts <Martin.Fouts at palmsource.com>
++ *
++ * 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_CONFIG_H__
++#define __YAFFS_CONFIG_H__
++
++#ifdef YAFFS_OUT_OF_TREE
++
++/* DO NOT UNSET THESE THREE. YAFFS2 will not compile if you do. */
++#define CONFIG_YAFFS_FS
++#define CONFIG_YAFFS_YAFFS1
++#define CONFIG_YAFFS_YAFFS2
++
++/* These options are independent of each other. Select those that matter. */
++
++/* Default: Not selected */
++/* Meaning: Yaffs does its own ECC, rather than using MTD ECC */
++//#define CONFIG_YAFFS_DOES_ECC
++
++/* Default: Not selected */
++/* Meaning: ECC byte order is 'wrong'. Only meaningful if */
++/* CONFIG_YAFFS_DOES_ECC is set */
++//#define CONFIG_YAFFS_ECC_WRONG_ORDER
++
++/* Default: Selected */
++/* Meaning: Disables testing whether chunks are erased before writing to them*/
++#define CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
++
++/* Default: Selected */
++/* Meaning: Cache short names, taking more RAM, but faster look-ups */
++#define CONFIG_YAFFS_SHORT_NAMES_IN_RAM
++
++/* Default: 10 */
++/* Meaning: set the count of blocks to reserve for checkpointing */
++#define YAFFS_CHECKPOINT_RESERVED_BLOCKS 10
++
++#endif /* YAFFS_OUT_OF_TREE */
++
++#endif /* __YAFFS_CONFIG_H__ */
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_checkptrw.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_checkptrw.c 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,384 @@
++/*
++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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.
++ */
++
++const char *yaffs_checkptrw_c_version =
++ "$Id: yaffs_checkptrw.c,v 1.13 2007/02/14 01:09:06 wookey Exp $";
++
++
++#include "yaffs_checkptrw.h"
++
++
++static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
++{
++
++ int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
++
++ T(YAFFS_TRACE_CHECKPOINT,
++ (TSTR("checkpt blocks available = %d" TENDSTR),
++ blocksAvailable));
++
++
++ return (blocksAvailable <= 0) ? 0 : 1;
++}
++
++
++
++static int yaffs_CheckpointErase(yaffs_Device *dev)
++{
++
++ int i;
++
++
++ if(!dev->eraseBlockInNAND)
++ return 0;
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("checking blocks %d to %d"TENDSTR),
++ dev->internalStartBlock,dev->internalEndBlock));
++
++ for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
++ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
++ if(bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT){
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("erasing checkpt block %d"TENDSTR),i));
++ if(dev->eraseBlockInNAND(dev,i- dev->blockOffset /* realign */)){
++ bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
++ dev->nErasedBlocks++;
++ dev->nFreeChunks += dev->nChunksPerBlock;
++ }
++ else {
++ dev->markNANDBlockBad(dev,i);
++ bi->blockState = YAFFS_BLOCK_STATE_DEAD;
++ }
++ }
++ }
++
++ dev->blocksInCheckpoint = 0;
++
++ return 1;
++}
++
++
++static void yaffs_CheckpointFindNextErasedBlock(yaffs_Device *dev)
++{
++ int i;
++ int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
++ T(YAFFS_TRACE_CHECKPOINT,
++ (TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR),
++ dev->nErasedBlocks,dev->nReservedBlocks,blocksAvailable,dev->checkpointNextBlock));
++
++ if(dev->checkpointNextBlock >= 0 &&
++ dev->checkpointNextBlock <= dev->internalEndBlock &&
++ blocksAvailable > 0){
++
++ for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
++ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
++ if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY){
++ dev->checkpointNextBlock = i + 1;
++ dev->checkpointCurrentBlock = i;
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("allocating checkpt block %d"TENDSTR),i));
++ return;
++ }
++ }
++ }
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("out of checkpt blocks"TENDSTR)));
++
++ dev->checkpointNextBlock = -1;
++ dev->checkpointCurrentBlock = -1;
++}
++
++static void yaffs_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
++{
++ int i;
++ yaffs_ExtendedTags tags;
++
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("find next checkpt block: start: blocks %d next %d" TENDSTR),
++ dev->blocksInCheckpoint, dev->checkpointNextBlock));
++
++ if(dev->blocksInCheckpoint < dev->checkpointMaxBlocks)
++ for(i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++){
++ int chunk = i * dev->nChunksPerBlock;
++ int realignedChunk = chunk - dev->chunkOffset;
++
++ dev->readChunkWithTagsFromNAND(dev,realignedChunk,NULL,&tags);
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("find next checkpt block: search: block %d oid %d seq %d eccr %d" TENDSTR),
++ i, tags.objectId,tags.sequenceNumber,tags.eccResult));
++
++ if(tags.sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA){
++ /* Right kind of block */
++ dev->checkpointNextBlock = tags.objectId;
++ dev->checkpointCurrentBlock = i;
++ dev->checkpointBlockList[dev->blocksInCheckpoint] = i;
++ dev->blocksInCheckpoint++;
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("found checkpt block %d"TENDSTR),i));
++ return;
++ }
++ }
++
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("found no more checkpt blocks"TENDSTR)));
++
++ dev->checkpointNextBlock = -1;
++ dev->checkpointCurrentBlock = -1;
++}
++
++
++int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
++{
++
++ /* Got the functions we need? */
++ if (!dev->writeChunkWithTagsToNAND ||
++ !dev->readChunkWithTagsFromNAND ||
++ !dev->eraseBlockInNAND ||
++ !dev->markNANDBlockBad)
++ return 0;
++
++ if(forWriting && !yaffs_CheckpointSpaceOk(dev))
++ return 0;
++
++ if(!dev->checkpointBuffer)
++ dev->checkpointBuffer = YMALLOC_DMA(dev->nDataBytesPerChunk);
++ if(!dev->checkpointBuffer)
++ return 0;
++
++
++ dev->checkpointPageSequence = 0;
++
++ dev->checkpointOpenForWrite = forWriting;
++
++ dev->checkpointByteCount = 0;
++ dev->checkpointCurrentBlock = -1;
++ dev->checkpointCurrentChunk = -1;
++ dev->checkpointNextBlock = dev->internalStartBlock;
++
++ /* Erase all the blocks in the checkpoint area */
++ if(forWriting){
++ memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
++ dev->checkpointByteOffset = 0;
++ return yaffs_CheckpointErase(dev);
++
++
++ } else {
++ int i;
++ /* Set to a value that will kick off a read */
++ dev->checkpointByteOffset = dev->nDataBytesPerChunk;
++ /* A checkpoint block list of 1 checkpoint block per 16 block is (hopefully)
++ * going to be way more than we need */
++ dev->blocksInCheckpoint = 0;
++ dev->checkpointMaxBlocks = (dev->internalEndBlock - dev->internalStartBlock)/16 + 2;
++ dev->checkpointBlockList = YMALLOC(sizeof(int) * dev->checkpointMaxBlocks);
++ for(i = 0; i < dev->checkpointMaxBlocks; i++)
++ dev->checkpointBlockList[i] = -1;
++ }
++
++ return 1;
++}
++
++static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
++{
++
++ int chunk;
++ int realignedChunk;
++
++ yaffs_ExtendedTags tags;
++
++ if(dev->checkpointCurrentBlock < 0){
++ yaffs_CheckpointFindNextErasedBlock(dev);
++ dev->checkpointCurrentChunk = 0;
++ }
++
++ if(dev->checkpointCurrentBlock < 0)
++ return 0;
++
++ tags.chunkDeleted = 0;
++ tags.objectId = dev->checkpointNextBlock; /* Hint to next place to look */
++ tags.chunkId = dev->checkpointPageSequence + 1;
++ tags.sequenceNumber = YAFFS_SEQUENCE_CHECKPOINT_DATA;
++ tags.byteCount = dev->nDataBytesPerChunk;
++ if(dev->checkpointCurrentChunk == 0){
++ /* First chunk we write for the block? Set block state to
++ checkpoint */
++ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointCurrentBlock);
++ bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
++ dev->blocksInCheckpoint++;
++ }
++
++ chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock + dev->checkpointCurrentChunk;
++
++
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint wite buffer nand %d(%d:%d) objid %d chId %d" TENDSTR),
++ chunk, dev->checkpointCurrentBlock, dev->checkpointCurrentChunk,tags.objectId,tags.chunkId));
++
++ realignedChunk = chunk - dev->chunkOffset;
++
++ dev->writeChunkWithTagsToNAND(dev,realignedChunk,dev->checkpointBuffer,&tags);
++ dev->checkpointByteOffset = 0;
++ dev->checkpointPageSequence++;
++ dev->checkpointCurrentChunk++;
++ if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock){
++ dev->checkpointCurrentChunk = 0;
++ dev->checkpointCurrentBlock = -1;
++ }
++ memset(dev->checkpointBuffer,0,dev->nDataBytesPerChunk);
++
++ return 1;
++}
++
++
++int yaffs_CheckpointWrite(yaffs_Device *dev,const void *data, int nBytes)
++{
++ int i=0;
++ int ok = 1;
++
++
++ __u8 * dataBytes = (__u8 *)data;
++
++
++
++ if(!dev->checkpointBuffer)
++ return 0;
++
++ while(i < nBytes && ok) {
++
++
++
++ dev->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes ;
++ dev->checkpointByteOffset++;
++ i++;
++ dataBytes++;
++ dev->checkpointByteCount++;
++
++
++ if(dev->checkpointByteOffset < 0 ||
++ dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
++ ok = yaffs_CheckpointFlushBuffer(dev);
++
++ }
++
++ return i;
++}
++
++int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
++{
++ int i=0;
++ int ok = 1;
++ yaffs_ExtendedTags tags;
++
++
++ int chunk;
++ int realignedChunk;
++
++ __u8 *dataBytes = (__u8 *)data;
++
++ if(!dev->checkpointBuffer)
++ return 0;
++
++ while(i < nBytes && ok) {
++
++
++ if(dev->checkpointByteOffset < 0 ||
++ dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
++
++ if(dev->checkpointCurrentBlock < 0){
++ yaffs_CheckpointFindNextCheckpointBlock(dev);
++ dev->checkpointCurrentChunk = 0;
++ }
++
++ if(dev->checkpointCurrentBlock < 0)
++ ok = 0;
++ else {
++
++ chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock +
++ dev->checkpointCurrentChunk;
++
++ realignedChunk = chunk - dev->chunkOffset;
++
++ /* read in the next chunk */
++ /* printf("read checkpoint page %d\n",dev->checkpointPage); */
++ dev->readChunkWithTagsFromNAND(dev, realignedChunk,
++ dev->checkpointBuffer,
++ &tags);
++
++ if(tags.chunkId != (dev->checkpointPageSequence + 1) ||
++ tags.sequenceNumber != YAFFS_SEQUENCE_CHECKPOINT_DATA)
++ ok = 0;
++
++ dev->checkpointByteOffset = 0;
++ dev->checkpointPageSequence++;
++ dev->checkpointCurrentChunk++;
++
++ if(dev->checkpointCurrentChunk >= dev->nChunksPerBlock)
++ dev->checkpointCurrentBlock = -1;
++ }
++ }
++
++ if(ok){
++ *dataBytes = dev->checkpointBuffer[dev->checkpointByteOffset];
++ dev->checkpointByteOffset++;
++ i++;
++ dataBytes++;
++ dev->checkpointByteCount++;
++ }
++ }
++
++ return i;
++}
++
++int yaffs_CheckpointClose(yaffs_Device *dev)
++{
++
++ if(dev->checkpointOpenForWrite){
++ if(dev->checkpointByteOffset != 0)
++ yaffs_CheckpointFlushBuffer(dev);
++ } else {
++ int i;
++ for(i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++){
++ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,dev->checkpointBlockList[i]);
++ if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
++ bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
++ else {
++ // Todo this looks odd...
++ }
++ }
++ YFREE(dev->checkpointBlockList);
++ dev->checkpointBlockList = NULL;
++ }
++
++ dev->nFreeChunks -= dev->blocksInCheckpoint * dev->nChunksPerBlock;
++ dev->nErasedBlocks -= dev->blocksInCheckpoint;
++
++
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint byte count %d" TENDSTR),
++ dev->checkpointByteCount));
++
++ if(dev->checkpointBuffer){
++ /* free the buffer */
++ YFREE(dev->checkpointBuffer);
++ dev->checkpointBuffer = NULL;
++ return 1;
++ }
++ else
++ return 0;
++
++}
++
++int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)
++{
++ /* Erase the first checksum block */
++
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("checkpoint invalidate"TENDSTR)));
++
++ if(!yaffs_CheckpointSpaceOk(dev))
++ return 0;
++
++ return yaffs_CheckpointErase(dev);
++}
++
++
++
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_checkptrw.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_checkptrw.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,33 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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 yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting);
++
++int yaffs_CheckpointWrite(yaffs_Device *dev,const void *data, int nBytes);
++
++int yaffs_CheckpointRead(yaffs_Device *dev,void *data, int nBytes);
++
++int yaffs_CheckpointClose(yaffs_Device *dev);
++
++int yaffs_CheckpointInvalidateStream(yaffs_Device *dev);
++
++
++#endif
++
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_ecc.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_ecc.c 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,331 @@
++/*
++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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.
++ *
++ */
++
++/* 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.
++ */
++
++const char *yaffs_ecc_c_version =
++ "$Id: yaffs_ecc.c,v 1.9 2007/02/14 01:09:06 wookey Exp $";
++
++#include "yportenv.h"
++
++#include "yaffs_ecc.h"
++
++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,
++};
++
++/* Count the bits in an unsigned char or a U32 */
++
++static int yaffs_CountBits(unsigned char x)
++{
++ int r = 0;
++ while (x) {
++ if (x & 1)
++ r++;
++ x >>= 1;
++ }
++ return r;
++}
++
++static int yaffs_CountBits32(unsigned x)
++{
++ int r = 0;
++ while (x) {
++ if (x & 1)
++ r++;
++ x >>= 1;
++ }
++ return r;
++}
++
++/* Calculate the ECC for a 256-byte block of data */
++void yaffs_ECCCalculate(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;
++
++#ifdef CONFIG_YAFFS_ECC_WRONG_ORDER
++ // Swap the bytes into the wrong order
++ t = ecc[0];
++ ecc[0] = ecc[1];
++ ecc[1] = t;
++#endif
++}
++
++
++/* Correct the ECC on a 256 byte block of data */
++
++int yaffs_ECCCorrect(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;
++
++#ifdef CONFIG_YAFFS_ECC_WRONG_ORDER
++ // swap the bytes to correct for the wrong order
++ unsigned char t;
++
++ t = d0;
++ d0 = d1;
++ d1 = t;
++#endif
++
++ 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 ((yaffs_CountBits(d0) +
++ yaffs_CountBits(d1) +
++ yaffs_CountBits(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_ECCCalculateOther(const unsigned char *data, unsigned nBytes,
++ yaffs_ECCOther * eccOther)
++{
++ unsigned int i;
++
++ unsigned char col_parity = 0;
++ unsigned line_parity = 0;
++ unsigned line_parity_prime = 0;
++ unsigned char b;
++
++ for (i = 0; i < nBytes; 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;
++ }
++
++ }
++
++ eccOther->colParity = (col_parity >> 2) & 0x3f;
++ eccOther->lineParity = line_parity;
++ eccOther->lineParityPrime = line_parity_prime;
++}
++
++int yaffs_ECCCorrectOther(unsigned char *data, unsigned nBytes,
++ yaffs_ECCOther * read_ecc,
++ const yaffs_ECCOther * test_ecc)
++{
++ unsigned char cDelta; /* column parity delta */
++ unsigned lDelta; /* line parity delta */
++ unsigned lDeltaPrime; /* line parity delta */
++ unsigned bit;
++
++ cDelta = read_ecc->colParity ^ test_ecc->colParity;
++ lDelta = read_ecc->lineParity ^ test_ecc->lineParity;
++ lDeltaPrime = read_ecc->lineParityPrime ^ test_ecc->lineParityPrime;
++
++ if ((cDelta | lDelta | lDeltaPrime) == 0)
++ return 0; /* no error */
++
++ if (lDelta == ~lDeltaPrime &&
++ (((cDelta ^ (cDelta >> 1)) & 0x15) == 0x15))
++ {
++ /* Single bit (recoverable) error in data */
++
++ bit = 0;
++
++ if (cDelta & 0x20)
++ bit |= 0x04;
++ if (cDelta & 0x08)
++ bit |= 0x02;
++ if (cDelta & 0x02)
++ bit |= 0x01;
++
++ if(lDelta >= nBytes)
++ return -1;
++
++ data[lDelta] ^= (1 << bit);
++
++ return 1; /* corrected */
++ }
++
++ if ((yaffs_CountBits32(lDelta) + yaffs_CountBits32(lDeltaPrime) +
++ yaffs_CountBits(cDelta)) == 1) {
++ /* Reccoverable error in ecc */
++
++ *read_ecc = *test_ecc;
++ return 1; /* corrected */
++ }
++
++ /* Unrecoverable error */
++
++ return -1;
++
++}
++
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_ecc.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_ecc.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,44 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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__
++
++typedef struct {
++ unsigned char colParity;
++ unsigned lineParity;
++ unsigned lineParityPrime;
++} yaffs_ECCOther;
++
++void yaffs_ECCCalculate(const unsigned char *data, unsigned char *ecc);
++int yaffs_ECCCorrect(unsigned char *data, unsigned char *read_ecc,
++ const unsigned char *test_ecc);
++
++void yaffs_ECCCalculateOther(const unsigned char *data, unsigned nBytes,
++ yaffs_ECCOther * ecc);
++int yaffs_ECCCorrectOther(unsigned char *data, unsigned nBytes,
++ yaffs_ECCOther * read_ecc,
++ const yaffs_ECCOther * test_ecc);
++#endif
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_fs.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_fs.c 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,2136 @@
++/*
++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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 yaffs_Device associated with
++ * this superblock
++ * >> 2.6: sb->s_fs_info points to the yaffs_Device associated with this
++ * superblock
++ * >> inode->u.generic_ip points to the associated yaffs_Object.
++ */
++
++const char *yaffs_fs_c_version =
++ "$Id: yaffs_fs.c,v 1.58 2007/02/14 01:09:06 wookey Exp $";
++extern const char *yaffs_guts_c_version;
++
++#include <linux/version.h>
++#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/list.h>
++#include <linux/fs.h>
++#include <linux/proc_fs.h>
++#include <linux/smp_lock.h>
++#include <linux/pagemap.h>
++#include <linux/mtd/mtd.h>
++#include <linux/interrupt.h>
++#include <linux/string.h>
++#include <linux/ctype.h>
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
++
++#include <linux/statfs.h> /* Added NCB 15-8-2003 */
++#include <asm/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
++
++#include <asm/uaccess.h>
++
++#include "yportenv.h"
++#include "yaffs_guts.h"
++
++unsigned yaffs_traceMask = YAFFS_TRACE_ALWAYS |
++ YAFFS_TRACE_BAD_BLOCKS |
++ YAFFS_TRACE_CHECKPOINT
++ /* | 0xFFFFFFFF */;
++
++#include <linux/mtd/mtd.h>
++#include "yaffs_mtdif.h"
++#include "yaffs_mtdif2.h"
++
++/*#define T(x) printk x */
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
++#define yaffs_InodeToObjectLV(iptr) (iptr)->i_private
++#else
++#define yaffs_InodeToObjectLV(iptr) (iptr)->u.generic_ip
++#endif
++
++#define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
++#define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
++#define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->s_fs_info)
++#else
++#define yaffs_SuperToDevice(sb) ((yaffs_Device *)sb->u.generic_sbp)
++#endif
++
++static void yaffs_put_super(struct super_block *sb);
++
++static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
++ loff_t * pos);
++
++#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
++
++static int yaffs_sync_object(struct file *file, struct dentry *dentry,
++ int datasync);
++
++static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
++static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
++ struct nameidata *n);
++static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
++ struct nameidata *n);
++#else
++static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
++static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
++#endif
++static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
++ struct dentry *dentry);
++static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
++static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
++ const char *symname);
++static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
++static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
++ dev_t dev);
++#else
++static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
++ int dev);
++#endif
++static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
++ struct inode *new_dir, struct dentry *new_dentry);
++static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++static int yaffs_sync_fs(struct super_block *sb, int wait);
++static void yaffs_write_super(struct super_block *sb);
++#else
++static int yaffs_sync_fs(struct super_block *sb);
++static int yaffs_write_super(struct super_block *sb);
++#endif
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
++#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
++static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
++#else
++static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
++#endif
++static void yaffs_read_inode(struct inode *inode);
++
++static void yaffs_put_inode(struct inode *inode);
++static void yaffs_delete_inode(struct inode *);
++static void yaffs_clear_inode(struct inode *);
++
++static int yaffs_readpage(struct file *file, struct page *page);
++#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
++static int yaffs_prepare_write(struct file *f, struct page *pg,
++ unsigned offset, unsigned to);
++static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
++ unsigned to);
++
++static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
++ int buflen);
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
++static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
++#else
++static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
++#endif
++
++static struct address_space_operations yaffs_file_address_operations = {
++ .readpage = yaffs_readpage,
++ .writepage = yaffs_writepage,
++ .prepare_write = yaffs_prepare_write,
++ .commit_write = yaffs_commit_write,
++};
++
++static struct file_operations yaffs_file_operations = {
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,18))
++ .read = do_sync_read,
++ .write = do_sync_write,
++ .aio_read = generic_file_aio_read,
++ .aio_write = generic_file_aio_write,
++#else
++ .read = generic_file_read,
++ .write = generic_file_write,
++#endif
++ .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
++
++};
++
++static struct inode_operations yaffs_file_inode_operations = {
++ .setattr = yaffs_setattr,
++};
++
++static struct inode_operations yaffs_symlink_inode_operations = {
++ .readlink = yaffs_readlink,
++ .follow_link = yaffs_follow_link,
++ .setattr = yaffs_setattr,
++};
++
++static 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,
++};
++
++static struct file_operations yaffs_dir_operations = {
++ .read = generic_read_dir,
++ .readdir = yaffs_readdir,
++ .fsync = yaffs_sync_object,
++};
++
++static struct super_operations yaffs_super_ops = {
++ .statfs = yaffs_statfs,
++ .read_inode = yaffs_read_inode,
++ .put_inode = yaffs_put_inode,
++ .put_super = yaffs_put_super,
++ .delete_inode = yaffs_delete_inode,
++ .clear_inode = yaffs_clear_inode,
++ .sync_fs = yaffs_sync_fs,
++ .write_super = yaffs_write_super,
++};
++
++static void yaffs_GrossLock(yaffs_Device * dev)
++{
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs locking\n"));
++
++ down(&dev->grossLock);
++}
++
++static void yaffs_GrossUnlock(yaffs_Device * dev)
++{
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs unlocking\n"));
++ up(&dev->grossLock);
++
++}
++
++static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
++ int buflen)
++{
++ unsigned char *alias;
++ int ret;
++
++ yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
++
++ yaffs_GrossLock(dev);
++
++ alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
++
++ yaffs_GrossUnlock(dev);
++
++ if (!alias)
++ return -ENOMEM;
++
++ ret = vfs_readlink(dentry, buffer, buflen, alias);
++ kfree(alias);
++ return ret;
++}
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
++static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
++#else
++static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
++#endif
++{
++ unsigned char *alias;
++ int ret;
++ yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
++
++ yaffs_GrossLock(dev);
++
++ alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
++
++ yaffs_GrossUnlock(dev);
++
++ if (!alias)
++ {
++ ret = -ENOMEM;
++ goto out;
++ }
++
++ ret = vfs_follow_link(nd, alias);
++ kfree(alias);
++out:
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
++ return ERR_PTR (ret);
++#else
++ return ret;
++#endif
++}
++
++struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
++ yaffs_Object * obj);
++
++/*
++ * Lookup is used to find objects in the fs
++ */
++#if (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
++{
++ yaffs_Object *obj;
++ struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
++
++ yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
++
++ yaffs_GrossLock(dev);
++
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_lookup for %d:%s\n",
++ yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
++
++ obj =
++ yaffs_FindObjectByName(yaffs_InodeToObject(dir),
++ dentry->d_name.name);
++
++ obj = yaffs_GetEquivalentObject(obj); /* in case it was a hardlink */
++
++ /* Can't hold gross lock when calling yaffs_get_inode() */
++ yaffs_GrossUnlock(dev);
++
++ if (obj) {
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_lookup found %d\n", obj->objectId));
++
++ inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
++
++ if (inode) {
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_loookup dentry \n"));
++/* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
++ * d_add even if NULL inode */
++#if 0
++ /*dget(dentry); // try to solve directory bug */
++ d_add(dentry, inode);
++
++ /* return dentry; */
++ return NULL;
++#endif
++ }
++
++ } else {
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_lookup not found\n"));
++
++ }
++
++/* added NCB for 2.5/6 compatability - forces add even if inode is
++ * NULL which creates dentry hash */
++ d_add(dentry, inode);
++
++ return NULL;
++ /* return (ERR_PTR(-EIO)); */
++
++}
++
++/* 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)
++{
++ T(YAFFS_TRACE_OS,
++ ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
++ atomic_read(&inode->i_count)));
++
++}
++
++/* clear is called to tell the fs to release any per-inode data it holds */
++static void yaffs_clear_inode(struct inode *inode)
++{
++ yaffs_Object *obj;
++ yaffs_Device *dev;
++
++ obj = yaffs_InodeToObject(inode);
++
++ T(YAFFS_TRACE_OS,
++ ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
++ atomic_read(&inode->i_count),
++ obj ? "object exists" : "null object"));
++
++ if (obj) {
++ dev = obj->myDev;
++ yaffs_GrossLock(dev);
++
++ /* Clear the association between the inode and
++ * the yaffs_Object.
++ */
++ obj->myInode = NULL;
++ yaffs_InodeToObjectLV(inode) = NULL;
++
++ /* If the object freeing was deferred, then the real
++ * free happens now.
++ * This should fix the inode inconsistency problem.
++ */
++
++ yaffs_HandleDeferedFree(obj);
++
++ yaffs_GrossUnlock(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)
++{
++ yaffs_Object *obj = yaffs_InodeToObject(inode);
++ yaffs_Device *dev;
++
++ T(YAFFS_TRACE_OS,
++ ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
++ atomic_read(&inode->i_count),
++ obj ? "object exists" : "null object"));
++
++ if (obj) {
++ dev = obj->myDev;
++ yaffs_GrossLock(dev);
++ yaffs_DeleteFile(obj);
++ yaffs_GrossUnlock(dev);
++ }
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
++ truncate_inode_pages (&inode->i_data, 0);
++#endif
++ clear_inode(inode);
++}
++
++#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
++{
++ yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
++
++ yaffs_Device *dev = obj->myDev;
++
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_file_flush object %d (%s)\n", obj->objectId,
++ obj->dirty ? "dirty" : "clean"));
++
++ yaffs_GrossLock(dev);
++
++ yaffs_FlushFile(obj, 1);
++
++ yaffs_GrossUnlock(dev);
++
++ return 0;
++}
++
++static int yaffs_readpage_nolock(struct file *f, struct page *pg)
++{
++ /* Lifted from jffs2 */
++
++ yaffs_Object *obj;
++ unsigned char *pg_buf;
++ int ret;
++
++ yaffs_Device *dev;
++
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage at %08x, size %08x\n",
++ (unsigned)(pg->index << PAGE_CACHE_SHIFT),
++ (unsigned)PAGE_CACHE_SIZE));
++
++ obj = yaffs_DentryToObject(f->f_dentry);
++
++ dev = obj->myDev;
++
++#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_GrossLock(dev);
++
++ ret =
++ yaffs_ReadDataFromFile(obj, pg_buf, pg->index << PAGE_CACHE_SHIFT,
++ PAGE_CACHE_SIZE);
++
++ yaffs_GrossUnlock(dev);
++
++ if (ret >= 0)
++ ret = 0;
++
++ if (ret) {
++ ClearPageUptodate(pg);
++ SetPageError(pg);
++ } else {
++ SetPageUptodate(pg);
++ ClearPageError(pg);
++ }
++
++ flush_dcache_page(pg);
++ kunmap(pg);
++
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_readpage done\n"));
++ 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)
++{
++ return yaffs_readpage_unlock(f, pg);
++}
++
++/* writepage inspired by/stolen from smbfs */
++
++#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 address_space *mapping = page->mapping;
++ loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
++ struct inode *inode;
++ unsigned long end_index;
++ char *buffer;
++ yaffs_Object *obj;
++ int nWritten = 0;
++ unsigned nBytes;
++
++ if (!mapping)
++ BUG();
++ inode = mapping->host;
++ if (!inode)
++ BUG();
++
++ if (offset > inode->i_size) {
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG
++ "yaffs_writepage at %08x, inode size = %08x!!!\n",
++ (unsigned)(page->index << PAGE_CACHE_SHIFT),
++ (unsigned)inode->i_size));
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG " -> don't care!!\n"));
++ unlock_page(page);
++ return 0;
++ }
++
++ end_index = inode->i_size >> PAGE_CACHE_SHIFT;
++
++ /* easy case */
++ if (page->index < end_index) {
++ nBytes = PAGE_CACHE_SIZE;
++ } else {
++ nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
++ }
++
++ get_page(page);
++
++ buffer = kmap(page);
++
++ obj = yaffs_InodeToObject(inode);
++ yaffs_GrossLock(obj->myDev);
++
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_writepage at %08x, size %08x\n",
++ (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "writepag0: obj = %05x, ino = %05x\n",
++ (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
++
++ nWritten =
++ yaffs_WriteDataToFile(obj, buffer, page->index << PAGE_CACHE_SHIFT,
++ nBytes, 0);
++
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "writepag1: obj = %05x, ino = %05x\n",
++ (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
++
++ yaffs_GrossUnlock(obj->myDev);
++
++ kunmap(page);
++ SetPageUptodate(page);
++ UnlockPage(page);
++ put_page(page);
++
++ return (nWritten == nBytes) ? 0 : -ENOSPC;
++}
++
++static int yaffs_prepare_write(struct file *f, struct page *pg,
++ unsigned offset, unsigned to)
++{
++
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_prepair_write\n"));
++ if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
++ return yaffs_readpage_nolock(f, pg);
++
++ return 0;
++
++}
++
++static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
++ unsigned to)
++{
++
++ void *addr = page_address(pg) + offset;
++ loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
++ int nBytes = to - offset;
++ int nWritten;
++
++ unsigned spos = pos;
++ unsigned saddr = (unsigned)addr;
++
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_commit_write addr %x pos %x nBytes %d\n", saddr,
++ spos, nBytes));
++
++ nWritten = yaffs_file_write(f, addr, nBytes, &pos);
++
++ if (nWritten != nBytes) {
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG
++ "yaffs_commit_write not same size nWritten %d nBytes %d\n",
++ nWritten, nBytes));
++ SetPageError(pg);
++ ClearPageUptodate(pg);
++ } else {
++ SetPageUptodate(pg);
++ }
++
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_commit_write returning %d\n",
++ nWritten == nBytes ? 0 : nWritten));
++
++ return nWritten == nBytes ? 0 : nWritten;
++
++}
++
++static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object * obj)
++{
++ if (inode && obj) {
++
++
++ /* Check mode against the variant type and attempt to repair if broken. */
++ __u32 mode = obj->yst_mode;
++ switch( obj->variantType ){
++ 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_ino = obj->objectId;
++ inode->i_mode = obj->yst_mode;
++ inode->i_uid = obj->yst_uid;
++ inode->i_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_GetObjectFileLength(obj);
++ inode->i_blocks = (inode->i_size + 511) >> 9;
++
++ inode->i_nlink = yaffs_GetObjectLinkCount(obj);
++
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG
++ "yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
++ inode->i_mode, inode->i_uid, inode->i_gid,
++ (int)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_InodeToObjectLV(inode) = obj;
++
++ obj->myInode = inode;
++
++ } else {
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_FileInode invalid parameters\n"));
++ }
++
++}
++
++struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
++ yaffs_Object * obj)
++{
++ struct inode *inode;
++
++ if (!sb) {
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_get_inode for NULL super_block!!\n"));
++ return NULL;
++
++ }
++
++ if (!obj) {
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_get_inode for NULL object!!\n"));
++ return NULL;
++
++ }
++
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_get_inode for object %d\n", obj->objectId));
++
++ inode = iget(sb, obj->objectId);
++
++ /* NB Side effect: iget calls back to yaffs_read_inode(). */
++ /* iget also increments the inode's i_count */
++ /* NB You can't be holding grossLock or deadlock will happen! */
++
++ return inode;
++}
++
++static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
++ loff_t * pos)
++{
++ yaffs_Object *obj;
++ int nWritten, ipos;
++ struct inode *inode;
++ yaffs_Device *dev;
++
++ obj = yaffs_DentryToObject(f->f_dentry);
++
++ dev = obj->myDev;
++
++ yaffs_GrossLock(dev);
++
++ inode = f->f_dentry->d_inode;
++
++ if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND) {
++ ipos = inode->i_size;
++ } else {
++ ipos = *pos;
++ }
++
++ if (!obj) {
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_file_write: hey obj is null!\n"));
++ } else {
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG
++ "yaffs_file_write about to write writing %d bytes"
++ "to object %d at %d\n",
++ n, obj->objectId, ipos));
++ }
++
++ nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
++
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_file_write writing %d bytes, %d written at %d\n",
++ n, nWritten, ipos));
++ if (nWritten > 0) {
++ ipos += nWritten;
++ *pos = ipos;
++ if (ipos > inode->i_size) {
++ inode->i_size = ipos;
++ inode->i_blocks = (ipos + 511) >> 9;
++
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG
++ "yaffs_file_write size updated to %d bytes, "
++ "%d blocks\n",
++ ipos, (int)(inode->i_blocks)));
++ }
++
++ }
++ yaffs_GrossUnlock(dev);
++ return nWritten == 0 ? -ENOSPC : nWritten;
++}
++
++static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
++{
++ yaffs_Object *obj;
++ yaffs_Device *dev;
++ struct inode *inode = f->f_dentry->d_inode;
++ unsigned long offset, curoffs;
++ struct list_head *i;
++ yaffs_Object *l;
++
++ char name[YAFFS_MAX_NAME_LENGTH + 1];
++
++ obj = yaffs_DentryToObject(f->f_dentry);
++ dev = obj->myDev;
++
++ yaffs_GrossLock(dev);
++
++ offset = f->f_pos;
++
++ T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
++
++ if (offset == 0) {
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_readdir: entry . ino %d \n",
++ (int)inode->i_ino));
++ if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR)
++ < 0) {
++ goto out;
++ }
++ offset++;
++ f->f_pos++;
++ }
++ if (offset == 1) {
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_readdir: entry .. ino %d \n",
++ (int)f->f_dentry->d_parent->d_inode->i_ino));
++ if (filldir
++ (dirent, "..", 2, offset,
++ f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0) {
++ goto out;
++ }
++ 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;
++ }
++
++ list_for_each(i, &obj->variant.directoryVariant.children) {
++ curoffs++;
++ if (curoffs >= offset) {
++ l = list_entry(i, yaffs_Object, siblings);
++
++ yaffs_GetObjectName(l, name,
++ YAFFS_MAX_NAME_LENGTH + 1);
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_readdir: %s inode %d\n", name,
++ yaffs_GetObjectInode(l)));
++
++ if (filldir(dirent,
++ name,
++ strlen(name),
++ offset,
++ yaffs_GetObjectInode(l),
++ yaffs_GetObjectType(l))
++ < 0) {
++ goto up_and_out;
++ }
++
++ offset++;
++ f->f_pos++;
++ }
++ }
++
++ up_and_out:
++ out:
++
++ yaffs_GrossUnlock(dev);
++
++ return 0;
++}
++
++/*
++ * File creation. Allocate an inode, and we're done..
++ */
++#if (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;
++
++ yaffs_Object *obj = NULL;
++ yaffs_Device *dev;
++
++ yaffs_Object *parent = yaffs_InodeToObject(dir);
++
++ int error = -ENOSPC;
++ uid_t uid = current->fsuid;
++ gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
++
++ if((dir->i_mode & S_ISGID) && S_ISDIR(mode))
++ mode |= S_ISGID;
++
++ if (parent) {
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_mknod: parent object %d type %d\n",
++ parent->objectId, parent->variantType));
++ } else {
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_mknod: could not get parent object\n"));
++ return -EPERM;
++ }
++
++ T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
++ "mode %x dev %x\n",
++ dentry->d_name.name, mode, rdev));
++
++ dev = parent->myDev;
++
++ yaffs_GrossLock(dev);
++
++ switch (mode & S_IFMT) {
++ default:
++ /* Special (socket, fifo, device...) */
++ T(YAFFS_TRACE_OS, (KERN_DEBUG
++ "yaffs_mknod: making special\n"));
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
++ obj =
++ yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
++ gid, old_encode_dev(rdev));
++#else
++ obj =
++ yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
++ gid, rdev);
++#endif
++ break;
++ case S_IFREG: /* file */
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
++ obj =
++ yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
++ gid);
++ break;
++ case S_IFDIR: /* directory */
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_mknod: making directory\n"));
++ obj =
++ yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
++ uid, gid);
++ break;
++ case S_IFLNK: /* symlink */
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mknod: making file\n"));
++ obj = NULL; /* Do we ever get here? */
++ break;
++ }
++
++ /* Can not call yaffs_get_inode() with gross lock held */
++ yaffs_GrossUnlock(dev);
++
++ if (obj) {
++ inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
++ d_instantiate(dentry, inode);
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_mknod created object %d count = %d\n",
++ obj->objectId, atomic_read(&inode->i_count)));
++ error = 0;
++ } else {
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_mknod failed making object\n"));
++ error = -ENOMEM;
++ }
++
++ return error;
++}
++
++static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
++{
++ int retVal;
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_mkdir\n"));
++ retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
++#if 0
++ /* attempt to fix dir bug - didn't work */
++ if (!retVal) {
++ dget(dentry);
++ }
++#endif
++ return retVal;
++}
++
++#if (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
++{
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_create\n"));
++ return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
++}
++
++static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
++{
++ int retVal;
++
++ yaffs_Device *dev;
++
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_unlink %d:%s\n", (int)(dir->i_ino),
++ dentry->d_name.name));
++
++ dev = yaffs_InodeToObject(dir)->myDev;
++
++ yaffs_GrossLock(dev);
++
++ retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
++
++ if (retVal == YAFFS_OK) {
++ dentry->d_inode->i_nlink--;
++ dir->i_version++;
++ yaffs_GrossUnlock(dev);
++ mark_inode_dirty(dentry->d_inode);
++ return 0;
++ }
++ yaffs_GrossUnlock(dev);
++ return -ENOTEMPTY;
++}
++
++/*
++ * Create a link...
++ */
++static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
++ struct dentry *dentry)
++{
++ struct inode *inode = old_dentry->d_inode;
++ yaffs_Object *obj = NULL;
++ yaffs_Object *link = NULL;
++ yaffs_Device *dev;
++
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_link\n"));
++
++ obj = yaffs_InodeToObject(inode);
++ dev = obj->myDev;
++
++ yaffs_GrossLock(dev);
++
++ if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
++ {
++ link =
++ yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
++ obj);
++ }
++
++ if (link) {
++ old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
++ d_instantiate(dentry, old_dentry->d_inode);
++ atomic_inc(&old_dentry->d_inode->i_count);
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_link link count %d i_count %d\n",
++ old_dentry->d_inode->i_nlink,
++ atomic_read(&old_dentry->d_inode->i_count)));
++
++ }
++
++ yaffs_GrossUnlock(dev);
++
++ if (link) {
++
++ return 0;
++ }
++
++ return -EPERM;
++}
++
++static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
++ const char *symname)
++{
++ yaffs_Object *obj;
++ yaffs_Device *dev;
++ uid_t uid = current->fsuid;
++ gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : current->fsgid;
++
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_symlink\n"));
++
++ dev = yaffs_InodeToObject(dir)->myDev;
++ yaffs_GrossLock(dev);
++ obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
++ S_IFLNK | S_IRWXUGO, uid, gid, symname);
++ yaffs_GrossUnlock(dev);
++
++ if (obj) {
++
++ struct inode *inode;
++
++ inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
++ d_instantiate(dentry, inode);
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink created OK\n"));
++ return 0;
++ } else {
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "symlink not created\n"));
++
++ }
++
++ return -ENOMEM;
++}
++
++static int yaffs_sync_object(struct file *file, struct dentry *dentry,
++ int datasync)
++{
++
++ yaffs_Object *obj;
++ yaffs_Device *dev;
++
++ obj = yaffs_DentryToObject(dentry);
++
++ dev = obj->myDev;
++
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_object\n"));
++ yaffs_GrossLock(dev);
++ yaffs_FlushFile(obj, 1);
++ yaffs_GrossUnlock(dev);
++ return 0;
++}
++
++/*
++ * 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
++ */
++static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
++ struct inode *new_dir, struct dentry *new_dentry)
++{
++ yaffs_Device *dev;
++ int retVal = YAFFS_FAIL;
++ yaffs_Object *target;
++
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_rename\n"));
++ dev = yaffs_InodeToObject(old_dir)->myDev;
++
++ yaffs_GrossLock(dev);
++
++ /* Check if the target is an existing directory that is not empty. */
++ target =
++ yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
++ new_dentry->d_name.name);
++
++
++
++ if (target &&
++ target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
++ !list_empty(&target->variant.directoryVariant.children)) {
++
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "target is non-empty dir\n"));
++
++ retVal = YAFFS_FAIL;
++ } else {
++
++ /* Now does unlinking internally using shadowing mechanism */
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "calling yaffs_RenameObject\n"));
++
++ retVal =
++ yaffs_RenameObject(yaffs_InodeToObject(old_dir),
++ old_dentry->d_name.name,
++ yaffs_InodeToObject(new_dir),
++ new_dentry->d_name.name);
++
++ }
++ yaffs_GrossUnlock(dev);
++
++ if (retVal == YAFFS_OK) {
++ if(target) {
++ new_dentry->d_inode->i_nlink--;
++ mark_inode_dirty(new_dentry->d_inode);
++ }
++
++ return 0;
++ } else {
++ return -ENOTEMPTY;
++ }
++
++}
++
++static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
++{
++ struct inode *inode = dentry->d_inode;
++ int error;
++ yaffs_Device *dev;
++
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_setattr of object %d\n",
++ yaffs_InodeToObject(inode)->objectId));
++
++ if ((error = inode_change_ok(inode, attr)) == 0) {
++
++ dev = yaffs_InodeToObject(inode)->myDev;
++ yaffs_GrossLock(dev);
++ if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
++ YAFFS_OK) {
++ error = 0;
++ } else {
++ error = -EPERM;
++ }
++ yaffs_GrossUnlock(dev);
++ if (!error)
++ error = inode_setattr(inode, attr);
++ }
++ return error;
++}
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
++{
++ yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
++ 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)
++{
++ yaffs_Device *dev = yaffs_SuperToDevice(sb);
++#else
++static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
++{
++ yaffs_Device *dev = yaffs_SuperToDevice(sb);
++#endif
++
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_statfs\n"));
++
++ yaffs_GrossLock(dev);
++
++ buf->f_type = YAFFS_MAGIC;
++ buf->f_bsize = sb->s_blocksize;
++ buf->f_namelen = 255;
++ if (sb->s_blocksize > dev->nDataBytesPerChunk) {
++
++ buf->f_blocks =
++ (dev->endBlock - dev->startBlock +
++ 1) * dev->nChunksPerBlock / (sb->s_blocksize /
++ dev->nDataBytesPerChunk);
++ buf->f_bfree =
++ yaffs_GetNumberOfFreeChunks(dev) / (sb->s_blocksize /
++ dev->nDataBytesPerChunk);
++ } else {
++
++ buf->f_blocks =
++ (dev->endBlock - dev->startBlock +
++ 1) * dev->nChunksPerBlock * (dev->nDataBytesPerChunk /
++ sb->s_blocksize);
++ buf->f_bfree =
++ yaffs_GetNumberOfFreeChunks(dev) * (dev->nDataBytesPerChunk /
++ sb->s_blocksize);
++ }
++ buf->f_files = 0;
++ buf->f_ffree = 0;
++ buf->f_bavail = buf->f_bfree;
++
++ yaffs_GrossUnlock(dev);
++ return 0;
++}
++
++
++/**
++static int yaffs_do_sync_fs(struct super_block *sb)
++{
++
++ yaffs_Device *dev = yaffs_SuperToDevice(sb);
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_do_sync_fs\n"));
++
++ if(sb->s_dirt) {
++ yaffs_GrossLock(dev);
++
++ if(dev)
++ yaffs_CheckpointSave(dev);
++
++ yaffs_GrossUnlock(dev);
++
++ sb->s_dirt = 0;
++ }
++ return 0;
++}
++**/
++
++#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
++{
++
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_write_super\n"));
++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
++ return 0; /* yaffs_do_sync_fs(sb);*/
++#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
++{
++
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_sync_fs\n"));
++
++ return 0; /* yaffs_do_sync_fs(sb);*/
++
++}
++
++
++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.
++ */
++
++ yaffs_Object *obj;
++ yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
++
++ T(YAFFS_TRACE_OS,
++ (KERN_DEBUG "yaffs_read_inode for %d\n", (int)inode->i_ino));
++
++ yaffs_GrossLock(dev);
++
++ obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
++
++ yaffs_FillInodeFromObject(inode, obj);
++
++ yaffs_GrossUnlock(dev);
++}
++
++static LIST_HEAD(yaffs_dev_list);
++
++static void yaffs_put_super(struct super_block *sb)
++{
++ yaffs_Device *dev = yaffs_SuperToDevice(sb);
++
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_put_super\n"));
++
++ yaffs_GrossLock(dev);
++
++ yaffs_FlushEntireDeviceCache(dev);
++
++ if (dev->putSuperFunc) {
++ dev->putSuperFunc(sb);
++ }
++
++ yaffs_CheckpointSave(dev);
++ yaffs_Deinitialise(dev);
++
++ yaffs_GrossUnlock(dev);
++
++ /* we assume this is protected by lock_kernel() in mount/umount */
++ list_del(&dev->devList);
++
++ if(dev->spareBuffer){
++ YFREE(dev->spareBuffer);
++ dev->spareBuffer = NULL;
++ }
++
++ kfree(dev);
++}
++
++
++static void yaffs_MTDPutSuper(struct super_block *sb)
++{
++
++ struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
++
++ if (mtd->sync) {
++ mtd->sync(mtd);
++ }
++
++ put_mtd_device(mtd);
++}
++
++
++static void yaffs_MarkSuperBlockDirty(void *vsb)
++{
++ struct super_block *sb = (struct super_block *)vsb;
++
++ T(YAFFS_TRACE_OS, (KERN_DEBUG "yaffs_MarkSuperBlockDirty() sb = %p\n",sb));
++// if(sb)
++// sb->s_dirt = 1;
++}
++
++static struct super_block *yaffs_internal_read_super(int yaffsVersion,
++ struct super_block *sb,
++ void *data, int silent)
++{
++ int nBlocks;
++ struct inode *inode = NULL;
++ struct dentry *root;
++ yaffs_Device *dev = 0;
++ char devname_buf[BDEVNAME_SIZE + 1];
++ struct mtd_info *mtd;
++ int err;
++
++ sb->s_magic = YAFFS_MAGIC;
++ sb->s_op = &yaffs_super_ops;
++
++ if (!sb)
++ printk(KERN_INFO "yaffs: sb is NULL\n");
++ else 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\"\n",
++ sb->s_dev,
++ yaffs_devname(sb, devname_buf));
++
++ sb->s_blocksize = PAGE_CACHE_SIZE;
++ sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
++ T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
++ T(YAFFS_TRACE_OS,
++ ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
++
++#ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
++ T(YAFFS_TRACE_OS,
++ ("yaffs: Write verification disabled. All guarantees "
++ "null and void\n"));
++#endif
++
++ T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
++ "\"%s\"\n",
++ MAJOR(sb->s_dev), MINOR(sb->s_dev),
++ yaffs_devname(sb, devname_buf)));
++
++ /* Check it's an mtd device..... */
++ if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR) {
++ return NULL; /* This isn't an mtd device */
++ }
++ /* Get the device */
++ mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
++ if (!mtd) {
++ T(YAFFS_TRACE_ALWAYS,
++ ("yaffs: MTD device #%u doesn't appear to exist\n",
++ MINOR(sb->s_dev)));
++ return NULL;
++ }
++ /* Check it's NAND */
++ if (mtd->type != MTD_NANDFLASH) {
++ T(YAFFS_TRACE_ALWAYS,
++ ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
++ return NULL;
++ }
++
++ T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
++ T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
++ T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
++ T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
++ T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
++ T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
++ T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ T(YAFFS_TRACE_OS, (" writesize %d\n", mtd->writesize));
++#else
++ T(YAFFS_TRACE_OS, (" oobblock %d\n", mtd->oobblock));
++#endif
++ T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
++ T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
++ T(YAFFS_TRACE_OS, (" size %d\n", mtd->size));
++
++#ifdef CONFIG_YAFFS_AUTO_YAFFS2
++
++ if (yaffsVersion == 1 &&
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ mtd->writesize >= 2048) {
++#else
++ mtd->oobblock >= 2048) {
++#endif
++ T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs2\n"));
++ yaffsVersion = 2;
++ }
++
++ /* Added NCB 26/5/2006 for completeness */
++ if (yaffsVersion == 2 &&
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ mtd->writesize == 512) {
++#else
++ mtd->oobblock == 512) {
++#endif
++ T(YAFFS_TRACE_ALWAYS,("yaffs: auto selecting yaffs1\n"));
++ yaffsVersion = 1;
++ }
++
++#endif
++
++ if (yaffsVersion == 2) {
++ /* Check for version 2 style functions */
++ if (!mtd->erase ||
++ !mtd->block_isbad ||
++ !mtd->block_markbad ||
++ !mtd->read ||
++ !mtd->write ||
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ !mtd->read_oob || !mtd->write_oob) {
++#else
++ !mtd->write_ecc ||
++ !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
++#endif
++ T(YAFFS_TRACE_ALWAYS,
++ ("yaffs: MTD device does not support required "
++ "functions\n"));;
++ return NULL;
++ }
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ if (mtd->writesize < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
++#else
++ if (mtd->oobblock < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
++#endif
++ mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) {
++ T(YAFFS_TRACE_ALWAYS,
++ ("yaffs: MTD device does not have the "
++ "right page sizes\n"));
++ return NULL;
++ }
++ } else {
++ /* Check for V1 style functions */
++ if (!mtd->erase ||
++ !mtd->read ||
++ !mtd->write ||
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ !mtd->read_oob || !mtd->write_oob) {
++#else
++ !mtd->write_ecc ||
++ !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
++#endif
++ T(YAFFS_TRACE_ALWAYS,
++ ("yaffs: MTD device does not support required "
++ "functions\n"));;
++ return NULL;
++ }
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ if (mtd->writesize < YAFFS_BYTES_PER_CHUNK ||
++#else
++ if (mtd->oobblock < YAFFS_BYTES_PER_CHUNK ||
++#endif
++ mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
++ T(YAFFS_TRACE_ALWAYS,
++ ("yaffs: MTD device does not support have the "
++ "right page sizes\n"));
++ 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 yaffs_Device up for mtd
++ */
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
++ sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
++#else
++ sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
++#endif
++ if (!dev) {
++ /* Deep shit could not allocate device structure */
++ T(YAFFS_TRACE_ALWAYS,
++ ("yaffs_read_super: Failed trying to allocate "
++ "yaffs_Device. \n"));
++ return NULL;
++ }
++
++ memset(dev, 0, sizeof(yaffs_Device));
++ dev->genericDevice = mtd;
++ dev->name = mtd->name;
++
++ /* Set up the memory size parameters.... */
++
++ nBlocks = mtd->size / (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
++ dev->startBlock = 0;
++ dev->endBlock = nBlocks - 1;
++ dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
++ dev->nDataBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
++ dev->nReservedBlocks = 5;
++ dev->nShortOpCaches = 10; /* Enable short op caching */
++
++ /* ... and the functions. */
++ if (yaffsVersion == 2) {
++ dev->writeChunkWithTagsToNAND =
++ nandmtd2_WriteChunkWithTagsToNAND;
++ dev->readChunkWithTagsFromNAND =
++ nandmtd2_ReadChunkWithTagsFromNAND;
++ dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
++ dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
++ dev->spareBuffer = YMALLOC(mtd->oobsize);
++ dev->isYaffs2 = 1;
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ dev->nDataBytesPerChunk = mtd->writesize;
++ dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
++#else
++ dev->nDataBytesPerChunk = mtd->oobblock;
++ dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
++#endif
++ nBlocks = mtd->size / mtd->erasesize;
++
++ dev->nCheckpointReservedBlocks = CONFIG_YAFFS_CHECKPOINT_RESERVED_BLOCKS;
++ dev->startBlock = 0;
++ dev->endBlock = nBlocks - 1;
++ } else {
++ dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
++ dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
++ dev->isYaffs2 = 0;
++ }
++ /* ... and common functions */
++ dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
++ dev->initialiseNAND = nandmtd_InitialiseNAND;
++
++ dev->putSuperFunc = yaffs_MTDPutSuper;
++
++ dev->superBlock = (void *)sb;
++ dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
++
++
++#ifndef CONFIG_YAFFS_DOES_ECC
++ dev->useNANDECC = 1;
++#endif
++
++#ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
++ dev->wideTnodesDisabled = 1;
++#endif
++
++ /* we assume this is protected by lock_kernel() in mount/umount */
++ list_add_tail(&dev->devList, &yaffs_dev_list);
++
++ init_MUTEX(&dev->grossLock);
++
++ yaffs_GrossLock(dev);
++
++ err = yaffs_GutsInitialise(dev);
++
++ T(YAFFS_TRACE_OS,
++ ("yaffs_read_super: guts initialised %s\n",
++ (err == YAFFS_OK) ? "OK" : "FAILED"));
++
++ /* Release lock before yaffs_get_inode() */
++ yaffs_GrossUnlock(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;
++
++ T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
++
++ root = d_alloc_root(inode);
++
++ T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
++
++ if (!root) {
++ iput(inode);
++ return NULL;
++ }
++ sb->s_root = root;
++
++ T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
++ 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(2,6,17))
++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",
++ .get_sb = yaffs_read_super,
++ .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
++
++
++#ifdef CONFIG_YAFFS_YAFFS2
++
++#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(2,6,17))
++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",
++ .get_sb = yaffs2_read_super,
++ .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
++
++#endif /* CONFIG_YAFFS_YAFFS2 */
++
++static struct proc_dir_entry *my_proc_entry;
++
++static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
++{
++ buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
++ buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
++ buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
++ buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
++ buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
++ buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
++ buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
++ buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
++ buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
++ buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
++ buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
++ buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
++ buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
++ buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
++ buf +=
++ sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
++ buf +=
++ sprintf(buf, "passiveGCs......... %d\n",
++ dev->passiveGarbageCollections);
++ buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
++ buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
++ buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
++ buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
++ buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
++ buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
++ buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
++ buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
++ buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
++ buf +=
++ sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
++ buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
++ buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
++
++ 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 devList.
++ * 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, "YAFFS built:" __DATE__ " " __TIME__
++ "\n%s\n%s\n", yaffs_fs_c_version,
++ yaffs_guts_c_version);
++ }
++
++ /* hold lock_kernel while traversing yaffs_dev_list */
++ lock_kernel();
++
++ /* Locate and print the Nth entry. Order N-squared but N is small. */
++ list_for_each(item, &yaffs_dev_list) {
++ yaffs_Device *dev = list_entry(item, yaffs_Device, devList);
++ if (n < step) {
++ n++;
++ continue;
++ }
++ buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
++ buf = yaffs_dump_dev(buf, dev);
++ break;
++ }
++ unlock_kernel();
++
++ return buf - page < count ? buf - page : count;
++}
++
++/**
++ * Set the verbosity of the warnings and error messages.
++ *
++ */
++
++static struct {
++ char *mask_name;
++ unsigned mask_bitfield;
++} mask_flags[] = {
++ {"allocate", YAFFS_TRACE_ALLOCATE},
++ {"always", YAFFS_TRACE_ALWAYS},
++ {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
++ {"buffers", YAFFS_TRACE_BUFFERS},
++ {"bug", YAFFS_TRACE_BUG},
++ {"deletion", YAFFS_TRACE_DELETION},
++ {"erase", YAFFS_TRACE_ERASE},
++ {"error", YAFFS_TRACE_ERROR},
++ {"gc_detail", YAFFS_TRACE_GC_DETAIL},
++ {"gc", YAFFS_TRACE_GC},
++ {"mtd", YAFFS_TRACE_MTD},
++ {"nandaccess", YAFFS_TRACE_NANDACCESS},
++ {"os", YAFFS_TRACE_OS},
++ {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
++ {"scan", YAFFS_TRACE_SCAN},
++ {"tracing", YAFFS_TRACE_TRACING},
++ {"write", YAFFS_TRACE_WRITE},
++ {"all", 0xffffffff},
++ {"none", 0},
++ {NULL, 0},
++};
++
++static int yaffs_proc_write(struct file *file, const char *buf,
++ unsigned long count, void *data)
++{
++ unsigned rg = 0, mask_bitfield;
++ char *end, *mask_name;
++ int i;
++ int done = 0;
++ int add, len = 0;
++ int pos = 0;
++
++ rg = yaffs_traceMask;
++
++ 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);
++ done = 0;
++ } else {
++
++ for (i = 0; mask_flags[i].mask_name != NULL; i++) {
++ len = strlen(mask_flags[i].mask_name);
++ if (strncmp(buf + pos, mask_flags[i].mask_name, len) == 0) {
++ mask_name = mask_flags[i].mask_name;
++ mask_bitfield = mask_flags[i].mask_bitfield;
++ done = 0;
++ break;
++ }
++ }
++ }
++
++ if (mask_name != NULL) {
++ pos += len;
++ 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_traceMask = rg | YAFFS_TRACE_ALWAYS;
++
++ 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("%c%s\n", flag, mask_flags[i].mask_name);
++ }
++ }
++
++ return 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[] = {
++//#ifdef CONFIG_YAFFS_YAFFS1
++ {&yaffs_fs_type, 0},
++//#endif
++//#ifdef CONFIG_YAFFS_YAFFS2
++ {&yaffs2_fs_type, 0},
++//#endif
++ {NULL, 0}
++};
++
++static int __init init_yaffs_fs(void)
++{
++ int error = 0;
++ struct file_system_to_install *fsinst;
++
++ T(YAFFS_TRACE_ALWAYS,
++ ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
++
++ /* Install the proc_fs entry */
++ my_proc_entry = create_proc_entry("yaffs",
++ S_IRUGO | S_IFREG,
++ &proc_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;
++ } else {
++ return -ENOMEM;
++ }
++
++ /* 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;
++
++ T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
++ " removing. \n"));
++
++ remove_proc_entry("yaffs", &proc_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., 2002-2006");
++MODULE_LICENSE("GPL");
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_guts.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_guts.c 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,6674 @@
++/*
++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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.
++ */
++
++const char *yaffs_guts_c_version =
++ "$Id: yaffs_guts.c,v 1.47 2007/02/14 01:09:06 wookey Exp $";
++
++#include "yportenv.h"
++
++#include "yaffsinterface.h"
++#include "yaffs_guts.h"
++#include "yaffs_tagsvalidity.h"
++
++#include "yaffs_tagscompat.h"
++#ifndef CONFIG_YAFFS_OWN_SORT
++#include "yaffs_qsort.h"
++#endif
++#include "yaffs_nand.h"
++
++#include "yaffs_checkptrw.h"
++
++#include "yaffs_nand.h"
++#include "yaffs_packedtags2.h"
++
++
++#ifdef CONFIG_YAFFS_WINCE
++void yfsd_LockYAFFS(BOOL fsLockOnly);
++void yfsd_UnlockYAFFS(BOOL fsLockOnly);
++#endif
++
++#define YAFFS_PASSIVE_GC_CHUNKS 2
++
++#include "yaffs_ecc.h"
++
++
++/* Robustification (if it ever comes about...) */
++static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND);
++static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk);
++static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
++ const __u8 * data,
++ const yaffs_ExtendedTags * tags);
++static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
++ const yaffs_ExtendedTags * tags);
++
++/* Other local prototypes */
++static int yaffs_UnlinkObject( yaffs_Object *obj);
++static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
++
++static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
++
++static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device * dev,
++ const __u8 * buffer,
++ yaffs_ExtendedTags * tags,
++ int useReserve);
++static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
++ int chunkInNAND, int inScan);
++
++static yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
++ yaffs_ObjectType type);
++static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
++ yaffs_Object * obj);
++static int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name,
++ int force, int isShrink, int shadows);
++static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj);
++static int yaffs_CheckStructures(void);
++static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
++ int chunkOffset, int *limit);
++static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
++
++static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
++
++static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo);
++static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
++ int lineNo);
++
++static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
++ int chunkInNAND);
++
++static int yaffs_UnlinkWorker(yaffs_Object * obj);
++static void yaffs_DestroyObject(yaffs_Object * obj);
++
++static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
++ int chunkInObject);
++
++loff_t yaffs_GetFileSize(yaffs_Object * obj);
++
++static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr);
++
++static void yaffs_VerifyFreeChunks(yaffs_Device * dev);
++
++#ifdef YAFFS_PARANOID
++static int yaffs_CheckFileSanity(yaffs_Object * in);
++#else
++#define yaffs_CheckFileSanity(in)
++#endif
++
++static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in);
++static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId);
++
++static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
++
++
++
++/* Function to calculate chunk and offset */
++
++static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, __u32 *chunk, __u32 *offset)
++{
++ if(dev->chunkShift){
++ /* Easy-peasy power of 2 case */
++ *chunk = (__u32)(addr >> dev->chunkShift);
++ *offset = (__u32)(addr & dev->chunkMask);
++ }
++ else if(dev->crumbsPerChunk)
++ {
++ /* Case where we're using "crumbs" */
++ *offset = (__u32)(addr & dev->crumbMask);
++ addr >>= dev->crumbShift;
++ *chunk = ((__u32)addr)/dev->crumbsPerChunk;
++ *offset += ((addr - (*chunk * dev->crumbsPerChunk)) << dev->crumbShift);
++ }
++ else
++ YBUG();
++}
++
++/* 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 __u32 ShiftsGE(__u32 x)
++{
++ int extraBits;
++ int nShifts;
++
++ nShifts = extraBits = 0;
++
++ while(x>1){
++ if(x & 1) extraBits++;
++ x>>=1;
++ nShifts++;
++ }
++
++ if(extraBits)
++ nShifts++;
++
++ return nShifts;
++}
++
++/* Function to return the number of shifts to get a 1 in bit 0
++ */
++
++static __u32 ShiftDiv(__u32 x)
++{
++ int nShifts;
++
++ nShifts = 0;
++
++ if(!x) return 0;
++
++ while( !(x&1)){
++ x>>=1;
++ nShifts++;
++ }
++
++ return nShifts;
++}
++
++
++
++/*
++ * Temporary buffer manipulations.
++ */
++
++static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
++{
++ int i, j;
++ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
++ if (dev->tempBuffer[i].line == 0) {
++ dev->tempBuffer[i].line = lineNo;
++ if ((i + 1) > dev->maxTemp) {
++ dev->maxTemp = i + 1;
++ for (j = 0; j <= i; j++)
++ dev->tempBuffer[j].maxLine =
++ dev->tempBuffer[j].line;
++ }
++
++ return dev->tempBuffer[i].buffer;
++ }
++ }
++
++ T(YAFFS_TRACE_BUFFERS,
++ (TSTR("Out of temp buffers at line %d, other held by lines:"),
++ lineNo));
++ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
++ T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
++ }
++ T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
++
++ /*
++ * If we got here then we have to allocate an unmanaged one
++ * This is not good.
++ */
++
++ dev->unmanagedTempAllocations++;
++ return YMALLOC(dev->nDataBytesPerChunk);
++
++}
++
++static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
++ int lineNo)
++{
++ int i;
++ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
++ if (dev->tempBuffer[i].buffer == buffer) {
++ dev->tempBuffer[i].line = 0;
++ return;
++ }
++ }
++
++ if (buffer) {
++ /* assume it is an unmanaged one. */
++ T(YAFFS_TRACE_BUFFERS,
++ (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
++ lineNo));
++ YFREE(buffer);
++ dev->unmanagedTempDeallocations++;
++ }
++
++}
++
++/*
++ * Determine if we have a managed buffer.
++ */
++int yaffs_IsManagedTempBuffer(yaffs_Device * dev, const __u8 * buffer)
++{
++ int i;
++ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
++ if (dev->tempBuffer[i].buffer == buffer)
++ return 1;
++
++ }
++
++ for (i = 0; i < dev->nShortOpCaches; i++) {
++ if( dev->srCache[i].data == buffer )
++ return 1;
++
++ }
++
++ if (buffer == dev->checkpointBuffer)
++ return 1;
++
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
++ return 0;
++}
++
++/*
++ * Chunk bitmap manipulations
++ */
++
++static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
++{
++ if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
++ blk));
++ YBUG();
++ }
++ return dev->chunkBits +
++ (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
++}
++
++static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
++{
++ __u8 *blkBits = yaffs_BlockBits(dev, blk);
++
++ memset(blkBits, 0, dev->chunkBitmapStride);
++}
++
++static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
++{
++ __u8 *blkBits = yaffs_BlockBits(dev, blk);
++
++ blkBits[chunk / 8] &= ~(1 << (chunk & 7));
++}
++
++static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
++{
++ __u8 *blkBits = yaffs_BlockBits(dev, blk);
++
++ blkBits[chunk / 8] |= (1 << (chunk & 7));
++}
++
++static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
++{
++ __u8 *blkBits = yaffs_BlockBits(dev, blk);
++ return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
++}
++
++static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
++{
++ __u8 *blkBits = yaffs_BlockBits(dev, blk);
++ int i;
++ for (i = 0; i < dev->chunkBitmapStride; i++) {
++ if (*blkBits)
++ return 1;
++ blkBits++;
++ }
++ return 0;
++}
++
++/*
++ * Simple hash function. Needs to have a reasonable spread
++ */
++
++static Y_INLINE int yaffs_HashFunction(int n)
++{
++ n = abs(n);
++ return (n % YAFFS_NOBJECT_BUCKETS);
++}
++
++/*
++ * Access functions to useful fake objects
++ */
++
++yaffs_Object *yaffs_Root(yaffs_Device * dev)
++{
++ return dev->rootDir;
++}
++
++yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
++{
++ return dev->lostNFoundDir;
++}
++
++
++/*
++ * Erased NAND checking functions
++ */
++
++int yaffs_CheckFF(__u8 * buffer, int nBytes)
++{
++ /* Horrible, slow implementation */
++ while (nBytes--) {
++ if (*buffer != 0xFF)
++ return 0;
++ buffer++;
++ }
++ return 1;
++}
++
++static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
++ int chunkInNAND)
++{
++
++ int retval = YAFFS_OK;
++ __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
++ yaffs_ExtendedTags tags;
++ int result;
++
++ result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
++
++ if(tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
++ retval = YAFFS_FAIL;
++
++
++ if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
++ T(YAFFS_TRACE_NANDACCESS,
++ (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
++ retval = YAFFS_FAIL;
++ }
++
++ yaffs_ReleaseTempBuffer(dev, data, __LINE__);
++
++ return retval;
++
++}
++
++static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
++ const __u8 * data,
++ yaffs_ExtendedTags * tags,
++ int useReserve)
++{
++ int chunk;
++
++ int writeOk = 0;
++ int erasedOk = 1;
++ int attempts = 0;
++ yaffs_BlockInfo *bi;
++
++ yaffs_InvalidateCheckpoint(dev);
++
++ do {
++ chunk = yaffs_AllocateChunk(dev, useReserve,&bi);
++
++ if (chunk >= 0) {
++ /* 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.
++ */
++
++ if(bi->gcPrioritise){
++ yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
++ } else {
++#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
++
++ bi->skipErasedCheck = 0;
++
++#endif
++ if(!bi->skipErasedCheck){
++ erasedOk = yaffs_CheckChunkErased(dev, chunk);
++ if(erasedOk && !bi->gcPrioritise)
++ bi->skipErasedCheck = 1;
++ }
++
++ if (!erasedOk) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("**>> yaffs chunk %d was not erased"
++ TENDSTR), chunk));
++ } else {
++ writeOk =
++ yaffs_WriteChunkWithTagsToNAND(dev, chunk,
++ data, tags);
++ }
++
++ attempts++;
++
++ if (writeOk) {
++ /*
++ * Copy the data into the robustification buffer.
++ * NB We do this at the end to prevent duplicates in the case of a write error.
++ * Todo
++ */
++ yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
++
++ } else {
++ /* The erased check or write failed */
++ yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
++ }
++ }
++ }
++
++ } while (chunk >= 0 && !writeOk);
++
++ if (attempts > 1) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR("**>> yaffs write required %d attempts" TENDSTR),
++ attempts));
++ dev->nRetriedWrites += (attempts - 1);
++ }
++
++ return chunk;
++}
++
++/*
++ * Block retiring for handling a broken block.
++ */
++
++static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
++{
++ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
++
++ yaffs_InvalidateCheckpoint(dev);
++
++ yaffs_MarkBlockBad(dev, blockInNAND);
++
++ bi->blockState = YAFFS_BLOCK_STATE_DEAD;
++ bi->gcPrioritise = 0;
++ bi->needsRetiring = 0;
++
++ dev->nRetiredBlocks++;
++}
++
++/*
++ * Functions for robustisizing TODO
++ *
++ */
++
++static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
++ const __u8 * data,
++ const yaffs_ExtendedTags * tags)
++{
++}
++
++static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
++ const yaffs_ExtendedTags * tags)
++{
++}
++
++void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
++{
++ if(!bi->gcPrioritise){
++ bi->gcPrioritise = 1;
++ dev->hasPendingPrioritisedGCs = 1;
++ bi->chunkErrorStrikes ++;
++
++ if(bi->chunkErrorStrikes > 3){
++ bi->needsRetiring = 1; /* Too many stikes, so retire this */
++ T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
++
++ }
++
++ }
++}
++
++static void yaffs_ReportOddballBlocks(yaffs_Device *dev)
++{
++ int i;
++
++ for(i = dev->internalStartBlock; i <= dev->internalEndBlock && (yaffs_traceMask & YAFFS_TRACE_BAD_BLOCKS); i++){
++ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
++ if(bi->needsRetiring || bi->gcPrioritise)
++ T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("yaffs block %d%s%s" TENDSTR),
++ i,
++ bi->needsRetiring ? " needs retiring" : "",
++ bi->gcPrioritise ? " gc prioritised" : ""));
++
++ }
++}
++
++static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk)
++{
++
++ int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
++ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
++
++ yaffs_HandleChunkError(dev,bi);
++
++
++ if(erasedOk ) {
++ /* Was an actual write failure, so mark the block for retirement */
++ bi->needsRetiring = 1;
++ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
++ (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
++
++
++ }
++
++ /* Delete the chunk */
++ yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
++}
++
++
++/*---------------- Name handling functions ------------*/
++
++static __u16 yaffs_CalcNameSum(const YCHAR * name)
++{
++ __u16 sum = 0;
++ __u16 i = 1;
++
++ YUCHAR *bname = (YUCHAR *) name;
++ if (bname) {
++ while ((*bname) && (i <= YAFFS_MAX_NAME_LENGTH)) {
++
++#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
++ sum += yaffs_toupper(*bname) * i;
++#else
++ sum += (*bname) * i;
++#endif
++ i++;
++ bname++;
++ }
++ }
++ return sum;
++}
++
++static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
++{
++#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
++ if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
++ yaffs_strcpy(obj->shortName, name);
++ } else {
++ obj->shortName[0] = _Y('\0');
++ }
++#endif
++ obj->sum = yaffs_CalcNameSum(name);
++}
++
++/*-------------------- TNODES -------------------
++
++ * List of spare tnodes
++ * The list is hooked together using the first pointer
++ * in the tnode.
++ */
++
++/* yaffs_CreateTnodes creates a bunch more tnodes and
++ * adds them to the tnode free list.
++ * Don't use this function directly
++ */
++
++static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
++{
++ int i;
++ int tnodeSize;
++ yaffs_Tnode *newTnodes;
++ __u8 *mem;
++ yaffs_Tnode *curr;
++ yaffs_Tnode *next;
++ yaffs_TnodeList *tnl;
++
++ if (nTnodes < 1)
++ return YAFFS_OK;
++
++ /* Calculate the tnode size in bytes for variable width tnode support.
++ * Must be a multiple of 32-bits */
++ tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
++
++ /* make these things */
++
++ newTnodes = YMALLOC(nTnodes * tnodeSize);
++ mem = (__u8 *)newTnodes;
++
++ if (!newTnodes) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
++ return YAFFS_FAIL;
++ }
++
++ /* Hook them into the free list */
++#if 0
++ for (i = 0; i < nTnodes - 1; i++) {
++ newTnodes[i].internal[0] = &newTnodes[i + 1];
++#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
++ newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
++#endif
++ }
++
++ newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
++#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
++ newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
++#endif
++ dev->freeTnodes = newTnodes;
++#else
++ /* New hookup for wide tnodes */
++ for(i = 0; i < nTnodes -1; i++) {
++ curr = (yaffs_Tnode *) &mem[i * tnodeSize];
++ next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
++ curr->internal[0] = next;
++ }
++
++ curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
++ curr->internal[0] = dev->freeTnodes;
++ dev->freeTnodes = (yaffs_Tnode *)mem;
++
++#endif
++
++
++ dev->nFreeTnodes += nTnodes;
++ dev->nTnodesCreated += nTnodes;
++
++ /* 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 = YMALLOC(sizeof(yaffs_TnodeList));
++ if (!tnl) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("yaffs: Could not add tnodes to management list" TENDSTR)));
++
++ } else {
++ tnl->tnodes = newTnodes;
++ tnl->next = dev->allocatedTnodeList;
++ dev->allocatedTnodeList = tnl;
++ }
++
++ T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
++
++ return YAFFS_OK;
++}
++
++/* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
++
++static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
++{
++ yaffs_Tnode *tn = NULL;
++
++ /* If there are none left make more */
++ if (!dev->freeTnodes) {
++ yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
++ }
++
++ if (dev->freeTnodes) {
++ tn = dev->freeTnodes;
++#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
++ if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
++ /* Hoosterman, this thing looks like it isn't in the list */
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
++ }
++#endif
++ dev->freeTnodes = dev->freeTnodes->internal[0];
++ dev->nFreeTnodes--;
++ }
++
++ return tn;
++}
++
++static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
++{
++ yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
++
++ if(tn)
++ memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
++
++ return tn;
++}
++
++/* FreeTnode frees up a tnode and puts it back on the free list */
++static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
++{
++ if (tn) {
++#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
++ if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
++ /* Hoosterman, this thing looks like it is already in the list */
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
++ }
++ tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
++#endif
++ tn->internal[0] = dev->freeTnodes;
++ dev->freeTnodes = tn;
++ dev->nFreeTnodes++;
++ }
++}
++
++static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
++{
++ /* Free the list of allocated tnodes */
++ yaffs_TnodeList *tmp;
++
++ while (dev->allocatedTnodeList) {
++ tmp = dev->allocatedTnodeList->next;
++
++ YFREE(dev->allocatedTnodeList->tnodes);
++ YFREE(dev->allocatedTnodeList);
++ dev->allocatedTnodeList = tmp;
++
++ }
++
++ dev->freeTnodes = NULL;
++ dev->nFreeTnodes = 0;
++}
++
++static void yaffs_InitialiseTnodes(yaffs_Device * dev)
++{
++ dev->allocatedTnodeList = NULL;
++ dev->freeTnodes = NULL;
++ dev->nFreeTnodes = 0;
++ dev->nTnodesCreated = 0;
++
++}
++
++
++void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
++{
++ __u32 *map = (__u32 *)tn;
++ __u32 bitInMap;
++ __u32 bitInWord;
++ __u32 wordInMap;
++ __u32 mask;
++
++ pos &= YAFFS_TNODES_LEVEL0_MASK;
++ val >>= dev->chunkGroupBits;
++
++ bitInMap = pos * dev->tnodeWidth;
++ wordInMap = bitInMap /32;
++ bitInWord = bitInMap & (32 -1);
++
++ mask = dev->tnodeMask << bitInWord;
++
++ map[wordInMap] &= ~mask;
++ map[wordInMap] |= (mask & (val << bitInWord));
++
++ if(dev->tnodeWidth > (32-bitInWord)) {
++ bitInWord = (32 - bitInWord);
++ wordInMap++;;
++ mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
++ map[wordInMap] &= ~mask;
++ map[wordInMap] |= (mask & (val >> bitInWord));
++ }
++}
++
++__u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
++{
++ __u32 *map = (__u32 *)tn;
++ __u32 bitInMap;
++ __u32 bitInWord;
++ __u32 wordInMap;
++ __u32 val;
++
++ pos &= YAFFS_TNODES_LEVEL0_MASK;
++
++ bitInMap = pos * dev->tnodeWidth;
++ wordInMap = bitInMap /32;
++ bitInWord = bitInMap & (32 -1);
++
++ val = map[wordInMap] >> bitInWord;
++
++ if(dev->tnodeWidth > (32-bitInWord)) {
++ bitInWord = (32 - bitInWord);
++ wordInMap++;;
++ val |= (map[wordInMap] << bitInWord);
++ }
++
++ val &= dev->tnodeMask;
++ val <<= dev->chunkGroupBits;
++
++ 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 topLevel
++ * in the tree. 0 means only the level 0 tnode is in the tree.
++ */
++
++/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
++static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
++ yaffs_FileStructure * fStruct,
++ __u32 chunkId)
++{
++
++ yaffs_Tnode *tn = fStruct->top;
++ __u32 i;
++ int requiredTallness;
++ int level = fStruct->topLevel;
++
++ /* Check sane level and chunk Id */
++ if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
++ return NULL;
++ }
++
++ if (chunkId > YAFFS_MAX_CHUNK_ID) {
++ return NULL;
++ }
++
++ /* First check we're tall enough (ie enough topLevel) */
++
++ i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
++ requiredTallness = 0;
++ while (i) {
++ i >>= YAFFS_TNODES_INTERNAL_BITS;
++ requiredTallness++;
++ }
++
++ if (requiredTallness > fStruct->topLevel) {
++ /* Not tall enough, so we can't find it, return NULL. */
++ return NULL;
++ }
++
++ /* Traverse down to level 0 */
++ while (level > 0 && tn) {
++ tn = tn->
++ internal[(chunkId >>
++ ( YAFFS_TNODES_LEVEL0_BITS +
++ (level - 1) *
++ YAFFS_TNODES_INTERNAL_BITS)
++ ) &
++ YAFFS_TNODES_INTERNAL_MASK];
++ level--;
++
++ }
++
++ return tn;
++}
++
++/* AddOrFindLevel0Tnode 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.
++ */
++
++static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
++ yaffs_FileStructure * fStruct,
++ __u32 chunkId,
++ yaffs_Tnode *passedTn)
++{
++
++ int requiredTallness;
++ int i;
++ int l;
++ yaffs_Tnode *tn;
++
++ __u32 x;
++
++
++ /* Check sane level and page Id */
++ if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
++ return NULL;
++ }
++
++ if (chunkId > YAFFS_MAX_CHUNK_ID) {
++ return NULL;
++ }
++
++ /* First check we're tall enough (ie enough topLevel) */
++
++ x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
++ requiredTallness = 0;
++ while (x) {
++ x >>= YAFFS_TNODES_INTERNAL_BITS;
++ requiredTallness++;
++ }
++
++
++ if (requiredTallness > fStruct->topLevel) {
++ /* Not tall enough,gotta make the tree taller */
++ for (i = fStruct->topLevel; i < requiredTallness; i++) {
++
++ tn = yaffs_GetTnode(dev);
++
++ if (tn) {
++ tn->internal[0] = fStruct->top;
++ fStruct->top = tn;
++ } else {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR("yaffs: no more tnodes" TENDSTR)));
++ }
++ }
++
++ fStruct->topLevel = requiredTallness;
++ }
++
++ /* Traverse down to level 0, adding anything we need */
++
++ l = fStruct->topLevel;
++ tn = fStruct->top;
++
++ if(l > 0) {
++ while (l > 0 && tn) {
++ x = (chunkId >>
++ ( 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_GetTnode(dev);
++
++ } else if(l == 1) {
++ /* Looking from level 1 at level 0 */
++ if (passedTn) {
++ /* If we already have one, then release it.*/
++ if(tn->internal[x])
++ yaffs_FreeTnode(dev,tn->internal[x]);
++ tn->internal[x] = passedTn;
++
++ } else if(!tn->internal[x]) {
++ /* Don't have one, none passed in */
++ tn->internal[x] = yaffs_GetTnode(dev);
++ }
++ }
++
++ tn = tn->internal[x];
++ l--;
++ }
++ } else {
++ /* top is level 0 */
++ if(passedTn) {
++ memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
++ yaffs_FreeTnode(dev,passedTn);
++ }
++ }
++
++ return tn;
++}
++
++static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
++ yaffs_ExtendedTags * tags, int objectId,
++ int chunkInInode)
++{
++ int j;
++
++ for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
++ if (yaffs_CheckChunkBit
++ (dev, theChunk / dev->nChunksPerBlock,
++ theChunk % dev->nChunksPerBlock)) {
++ yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
++ tags);
++ if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
++ /* found it; */
++ return theChunk;
++
++ }
++ }
++ theChunk++;
++ }
++ return -1;
++}
++
++
++/* DeleteWorker scans backwards through the tnode tree and deletes all the
++ * chunks and tnodes in the file
++ * Returns 1 if the tree was deleted.
++ * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
++ */
++
++static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
++ int chunkOffset, int *limit)
++{
++ int i;
++ int chunkInInode;
++ int theChunk;
++ yaffs_ExtendedTags tags;
++ int foundChunk;
++ yaffs_Device *dev = in->myDev;
++
++ int allDone = 1;
++
++ if (tn) {
++ if (level > 0) {
++
++ for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
++ i--) {
++ if (tn->internal[i]) {
++ if (limit && (*limit) < 0) {
++ allDone = 0;
++ } else {
++ allDone =
++ yaffs_DeleteWorker(in,
++ tn->
++ internal
++ [i],
++ level -
++ 1,
++ (chunkOffset
++ <<
++ YAFFS_TNODES_INTERNAL_BITS)
++ + i,
++ limit);
++ }
++ if (allDone) {
++ yaffs_FreeTnode(dev,
++ tn->
++ internal[i]);
++ tn->internal[i] = NULL;
++ }
++ }
++
++ }
++ return (allDone) ? 1 : 0;
++ } else if (level == 0) {
++ int hitLimit = 0;
++
++ for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
++ i--) {
++ theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
++ if (theChunk) {
++
++ chunkInInode =
++ (chunkOffset <<
++ YAFFS_TNODES_LEVEL0_BITS) + i;
++
++ foundChunk =
++ yaffs_FindChunkInGroup(dev,
++ theChunk,
++ &tags,
++ in->objectId,
++ chunkInInode);
++
++ if (foundChunk > 0) {
++ yaffs_DeleteChunk(dev,
++ foundChunk, 1,
++ __LINE__);
++ in->nDataChunks--;
++ if (limit) {
++ *limit = *limit - 1;
++ if (*limit <= 0) {
++ hitLimit = 1;
++ }
++ }
++
++ }
++
++ yaffs_PutLevel0Tnode(dev,tn,i,0);
++ }
++
++ }
++ return (i < 0) ? 1 : 0;
++
++ }
++
++ }
++
++ return 1;
++
++}
++
++static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
++{
++
++ yaffs_BlockInfo *theBlock;
++
++ T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
++
++ theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
++ if (theBlock) {
++ theBlock->softDeletions++;
++ dev->nFreeChunks++;
++ }
++}
++
++/* 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_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
++ __u32 level, int chunkOffset)
++{
++ int i;
++ int theChunk;
++ int allDone = 1;
++ yaffs_Device *dev = in->myDev;
++
++ if (tn) {
++ if (level > 0) {
++
++ for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
++ i--) {
++ if (tn->internal[i]) {
++ allDone =
++ yaffs_SoftDeleteWorker(in,
++ tn->
++ internal[i],
++ level - 1,
++ (chunkOffset
++ <<
++ YAFFS_TNODES_INTERNAL_BITS)
++ + i);
++ if (allDone) {
++ yaffs_FreeTnode(dev,
++ tn->
++ internal[i]);
++ tn->internal[i] = NULL;
++ } else {
++ /* Hoosterman... how could this happen? */
++ }
++ }
++ }
++ return (allDone) ? 1 : 0;
++ } else if (level == 0) {
++
++ for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
++ theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
++ if (theChunk) {
++ /* Note this does not find the real chunk, only the chunk group.
++ * We make an assumption that a chunk group is not larger than
++ * a block.
++ */
++ yaffs_SoftDeleteChunk(dev, theChunk);
++ yaffs_PutLevel0Tnode(dev,tn,i,0);
++ }
++
++ }
++ return 1;
++
++ }
++
++ }
++
++ return 1;
++
++}
++
++static void yaffs_SoftDeleteFile(yaffs_Object * obj)
++{
++ if (obj->deleted &&
++ obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
++ if (obj->nDataChunks <= 0) {
++ /* Empty file with no duplicate object headers, just delete it immediately */
++ yaffs_FreeTnode(obj->myDev,
++ obj->variant.fileVariant.top);
++ obj->variant.fileVariant.top = NULL;
++ T(YAFFS_TRACE_TRACING,
++ (TSTR("yaffs: Deleting empty file %d" TENDSTR),
++ obj->objectId));
++ yaffs_DoGenericObjectDeletion(obj);
++ } else {
++ yaffs_SoftDeleteWorker(obj,
++ obj->variant.fileVariant.top,
++ obj->variant.fileVariant.
++ topLevel, 0);
++ obj->softDeleted = 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.
++ */
++
++static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
++ __u32 level, int del0)
++{
++ int i;
++ int hasData;
++
++ if (tn) {
++ hasData = 0;
++
++ for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
++ if (tn->internal[i] && level > 0) {
++ tn->internal[i] =
++ yaffs_PruneWorker(dev, tn->internal[i],
++ level - 1,
++ (i == 0) ? del0 : 1);
++ }
++
++ if (tn->internal[i]) {
++ hasData++;
++ }
++ }
++
++ if (hasData == 0 && del0) {
++ /* Free and return NULL */
++
++ yaffs_FreeTnode(dev, tn);
++ tn = NULL;
++ }
++
++ }
++
++ return tn;
++
++}
++
++static int yaffs_PruneFileStructure(yaffs_Device * dev,
++ yaffs_FileStructure * fStruct)
++{
++ int i;
++ int hasData;
++ int done = 0;
++ yaffs_Tnode *tn;
++
++ if (fStruct->topLevel > 0) {
++ fStruct->top =
++ yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 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 (fStruct->topLevel && !done) {
++ tn = fStruct->top;
++
++ hasData = 0;
++ for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
++ if (tn->internal[i]) {
++ hasData++;
++ }
++ }
++
++ if (!hasData) {
++ fStruct->top = tn->internal[0];
++ fStruct->topLevel--;
++ yaffs_FreeTnode(dev, tn);
++ } else {
++ done = 1;
++ }
++ }
++ }
++
++ return YAFFS_OK;
++}
++
++/*-------------------- End of File Structure functions.-------------------*/
++
++/* yaffs_CreateFreeObjects creates a bunch more objects and
++ * adds them to the object free list.
++ */
++static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
++{
++ int i;
++ yaffs_Object *newObjects;
++ yaffs_ObjectList *list;
++
++ if (nObjects < 1)
++ return YAFFS_OK;
++
++ /* make these things */
++ newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
++
++ if (!newObjects) {
++ T(YAFFS_TRACE_ALLOCATE,
++ (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
++ return YAFFS_FAIL;
++ }
++
++ /* Hook them into the free list */
++ for (i = 0; i < nObjects - 1; i++) {
++ newObjects[i].siblings.next =
++ (struct list_head *)(&newObjects[i + 1]);
++ }
++
++ newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
++ dev->freeObjects = newObjects;
++ dev->nFreeObjects += nObjects;
++ dev->nObjectsCreated += nObjects;
++
++ /* Now add this bunch of Objects to a list for freeing up. */
++
++ list = YMALLOC(sizeof(yaffs_ObjectList));
++ if (!list) {
++ T(YAFFS_TRACE_ALLOCATE,
++ (TSTR("Could not add objects to management list" TENDSTR)));
++ } else {
++ list->objects = newObjects;
++ list->next = dev->allocatedObjectList;
++ dev->allocatedObjectList = list;
++ }
++
++ return YAFFS_OK;
++}
++
++
++/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
++static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
++{
++ yaffs_Object *tn = NULL;
++
++ /* If there are none left make more */
++ if (!dev->freeObjects) {
++ yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
++ }
++
++ if (dev->freeObjects) {
++ tn = dev->freeObjects;
++ dev->freeObjects =
++ (yaffs_Object *) (dev->freeObjects->siblings.next);
++ dev->nFreeObjects--;
++
++ /* Now sweeten it up... */
++
++ memset(tn, 0, sizeof(yaffs_Object));
++ tn->myDev = dev;
++ tn->chunkId = -1;
++ tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
++ INIT_LIST_HEAD(&(tn->hardLinks));
++ INIT_LIST_HEAD(&(tn->hashLink));
++ INIT_LIST_HEAD(&tn->siblings);
++
++ /* Add it to the lost and found directory.
++ * NB Can't put root or lostNFound in lostNFound so
++ * check if lostNFound exists first
++ */
++ if (dev->lostNFoundDir) {
++ yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
++ }
++ }
++
++ return tn;
++}
++
++static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
++ __u32 mode)
++{
++
++ yaffs_Object *obj =
++ yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
++ if (obj) {
++ obj->fake = 1; /* it is fake so it has no NAND presence... */
++ obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
++ obj->unlinkAllowed = 0; /* ... or unlink it */
++ obj->deleted = 0;
++ obj->unlinked = 0;
++ obj->yst_mode = mode;
++ obj->myDev = dev;
++ obj->chunkId = 0; /* Not a valid chunk. */
++ }
++
++ return obj;
++
++}
++
++static void yaffs_UnhashObject(yaffs_Object * tn)
++{
++ int bucket;
++ yaffs_Device *dev = tn->myDev;
++
++ /* If it is still linked into the bucket list, free from the list */
++ if (!list_empty(&tn->hashLink)) {
++ list_del_init(&tn->hashLink);
++ bucket = yaffs_HashFunction(tn->objectId);
++ dev->objectBucket[bucket].count--;
++ }
++
++}
++
++/* FreeObject frees up a Object and puts it back on the free list */
++static void yaffs_FreeObject(yaffs_Object * tn)
++{
++
++ yaffs_Device *dev = tn->myDev;
++
++#ifdef __KERNEL__
++ if (tn->myInode) {
++ /* We're still hooked up to a cached inode.
++ * Don't delete now, but mark for later deletion
++ */
++ tn->deferedFree = 1;
++ return;
++ }
++#endif
++
++ yaffs_UnhashObject(tn);
++
++ /* Link into the free list. */
++ tn->siblings.next = (struct list_head *)(dev->freeObjects);
++ dev->freeObjects = tn;
++ dev->nFreeObjects++;
++}
++
++#ifdef __KERNEL__
++
++void yaffs_HandleDeferedFree(yaffs_Object * obj)
++{
++ if (obj->deferedFree) {
++ yaffs_FreeObject(obj);
++ }
++}
++
++#endif
++
++static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
++{
++ /* Free the list of allocated Objects */
++
++ yaffs_ObjectList *tmp;
++
++ while (dev->allocatedObjectList) {
++ tmp = dev->allocatedObjectList->next;
++ YFREE(dev->allocatedObjectList->objects);
++ YFREE(dev->allocatedObjectList);
++
++ dev->allocatedObjectList = tmp;
++ }
++
++ dev->freeObjects = NULL;
++ dev->nFreeObjects = 0;
++}
++
++static void yaffs_InitialiseObjects(yaffs_Device * dev)
++{
++ int i;
++
++ dev->allocatedObjectList = NULL;
++ dev->freeObjects = NULL;
++ dev->nFreeObjects = 0;
++
++ for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
++ INIT_LIST_HEAD(&dev->objectBucket[i].list);
++ dev->objectBucket[i].count = 0;
++ }
++
++}
++
++static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
++{
++ static int x = 0;
++ int i;
++ int l = 999;
++ int lowest = 999999;
++
++ /* First let's see if we can find one that's empty. */
++
++ for (i = 0; i < 10 && lowest > 0; i++) {
++ x++;
++ x %= YAFFS_NOBJECT_BUCKETS;
++ if (dev->objectBucket[x].count < lowest) {
++ lowest = dev->objectBucket[x].count;
++ l = x;
++ }
++
++ }
++
++ /* If we didn't find an empty list, then try
++ * looking a bit further for a short one
++ */
++
++ for (i = 0; i < 10 && lowest > 3; i++) {
++ x++;
++ x %= YAFFS_NOBJECT_BUCKETS;
++ if (dev->objectBucket[x].count < lowest) {
++ lowest = dev->objectBucket[x].count;
++ l = x;
++ }
++
++ }
++
++ return l;
++}
++
++static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
++{
++ int bucket = yaffs_FindNiceObjectBucket(dev);
++
++ /* Now find an object value that has not already been taken
++ * by scanning the list.
++ */
++
++ int found = 0;
++ struct list_head *i;
++
++ __u32 n = (__u32) bucket;
++
++ /* yaffs_CheckObjectHashSanity(); */
++
++ while (!found) {
++ found = 1;
++ n += YAFFS_NOBJECT_BUCKETS;
++ if (1 || dev->objectBucket[bucket].count > 0) {
++ list_for_each(i, &dev->objectBucket[bucket].list) {
++ /* If there is already one in the list */
++ if (i
++ && list_entry(i, yaffs_Object,
++ hashLink)->objectId == n) {
++ found = 0;
++ }
++ }
++ }
++ }
++
++
++ return n;
++}
++
++static void yaffs_HashObject(yaffs_Object * in)
++{
++ int bucket = yaffs_HashFunction(in->objectId);
++ yaffs_Device *dev = in->myDev;
++
++ list_add(&in->hashLink, &dev->objectBucket[bucket].list);
++ dev->objectBucket[bucket].count++;
++
++}
++
++yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
++{
++ int bucket = yaffs_HashFunction(number);
++ struct list_head *i;
++ yaffs_Object *in;
++
++ list_for_each(i, &dev->objectBucket[bucket].list) {
++ /* Look if it is in the list */
++ if (i) {
++ in = list_entry(i, yaffs_Object, hashLink);
++ if (in->objectId == number) {
++#ifdef __KERNEL__
++ /* Don't tell the VFS about this one if it is defered free */
++ if (in->deferedFree)
++ return NULL;
++#endif
++
++ return in;
++ }
++ }
++ }
++
++ return NULL;
++}
++
++yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
++ yaffs_ObjectType type)
++{
++
++ yaffs_Object *theObject;
++
++ if (number < 0) {
++ number = yaffs_CreateNewObjectNumber(dev);
++ }
++
++ theObject = yaffs_AllocateEmptyObject(dev);
++
++ if (theObject) {
++ theObject->fake = 0;
++ theObject->renameAllowed = 1;
++ theObject->unlinkAllowed = 1;
++ theObject->objectId = number;
++ yaffs_HashObject(theObject);
++ theObject->variantType = type;
++#ifdef CONFIG_YAFFS_WINCE
++ yfsd_WinFileTimeNow(theObject->win_atime);
++ theObject->win_ctime[0] = theObject->win_mtime[0] =
++ theObject->win_atime[0];
++ theObject->win_ctime[1] = theObject->win_mtime[1] =
++ theObject->win_atime[1];
++
++#else
++
++ theObject->yst_atime = theObject->yst_mtime =
++ theObject->yst_ctime = Y_CURRENT_TIME;
++#endif
++ switch (type) {
++ case YAFFS_OBJECT_TYPE_FILE:
++ theObject->variant.fileVariant.fileSize = 0;
++ theObject->variant.fileVariant.scannedFileSize = 0;
++ theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
++ theObject->variant.fileVariant.topLevel = 0;
++ theObject->variant.fileVariant.top =
++ yaffs_GetTnode(dev);
++ break;
++ case YAFFS_OBJECT_TYPE_DIRECTORY:
++ INIT_LIST_HEAD(&theObject->variant.directoryVariant.
++ children);
++ 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 theObject;
++}
++
++static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
++ int number,
++ yaffs_ObjectType type)
++{
++ yaffs_Object *theObject = NULL;
++
++ if (number > 0) {
++ theObject = yaffs_FindObjectByNumber(dev, number);
++ }
++
++ if (!theObject) {
++ theObject = yaffs_CreateNewObject(dev, number, type);
++ }
++
++ return theObject;
++
++}
++
++
++static YCHAR *yaffs_CloneString(const YCHAR * str)
++{
++ YCHAR *newStr = NULL;
++
++ if (str && *str) {
++ newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
++ yaffs_strcpy(newStr, str);
++ }
++
++ return newStr;
++
++}
++
++/*
++ * Mknod (create) a new object.
++ * equivalentObject only has meaning for a hard link;
++ * aliasString only has meaning for a sumlink.
++ * rdev only has meaning for devices (a subset of special objects)
++ */
++
++static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
++ yaffs_Object * parent,
++ const YCHAR * name,
++ __u32 mode,
++ __u32 uid,
++ __u32 gid,
++ yaffs_Object * equivalentObject,
++ const YCHAR * aliasString, __u32 rdev)
++{
++ yaffs_Object *in;
++
++ yaffs_Device *dev = parent->myDev;
++
++ /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
++ if (yaffs_FindObjectByName(parent, name)) {
++ return NULL;
++ }
++
++ in = yaffs_CreateNewObject(dev, -1, type);
++
++ if (in) {
++ in->chunkId = -1;
++ in->valid = 1;
++ in->variantType = type;
++
++ in->yst_mode = mode;
++
++#ifdef CONFIG_YAFFS_WINCE
++ yfsd_WinFileTimeNow(in->win_atime);
++ in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
++ in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
++
++#else
++ in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
++
++ in->yst_rdev = rdev;
++ in->yst_uid = uid;
++ in->yst_gid = gid;
++#endif
++ in->nDataChunks = 0;
++
++ yaffs_SetObjectName(in, name);
++ in->dirty = 1;
++
++ yaffs_AddObjectToDirectory(parent, in);
++
++ in->myDev = parent->myDev;
++
++ switch (type) {
++ case YAFFS_OBJECT_TYPE_SYMLINK:
++ in->variant.symLinkVariant.alias =
++ yaffs_CloneString(aliasString);
++ break;
++ case YAFFS_OBJECT_TYPE_HARDLINK:
++ in->variant.hardLinkVariant.equivalentObject =
++ equivalentObject;
++ in->variant.hardLinkVariant.equivalentObjectId =
++ equivalentObject->objectId;
++ list_add(&in->hardLinks, &equivalentObject->hardLinks);
++ 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_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
++ /* Could not create the object header, fail the creation */
++ yaffs_DestroyObject(in);
++ in = NULL;
++ }
++
++ }
++
++ return in;
++}
++
++yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
++ __u32 mode, __u32 uid, __u32 gid)
++{
++ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
++ uid, gid, NULL, NULL, 0);
++}
++
++yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
++ __u32 mode, __u32 uid, __u32 gid)
++{
++ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
++ mode, uid, gid, NULL, NULL, 0);
++}
++
++yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
++ __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
++{
++ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
++ uid, gid, NULL, NULL, rdev);
++}
++
++yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
++ __u32 mode, __u32 uid, __u32 gid,
++ const YCHAR * alias)
++{
++ return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
++ uid, gid, NULL, alias, 0);
++}
++
++/* yaffs_Link returns the object id of the equivalent object.*/
++yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
++ yaffs_Object * equivalentObject)
++{
++ /* Get the real object in case we were fed a hard link as an equivalent object */
++ equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
++
++ if (yaffs_MknodObject
++ (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
++ equivalentObject, NULL, 0)) {
++ return equivalentObject;
++ } else {
++ return NULL;
++ }
++
++}
++
++static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
++ const YCHAR * newName, int force, int shadows)
++{
++ int unlinkOp;
++ int deleteOp;
++
++ yaffs_Object *existingTarget;
++
++ if (newDir == NULL) {
++ newDir = obj->parent; /* use the old directory */
++ }
++
++ if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR
++ ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
++ TENDSTR)));
++ YBUG();
++ }
++
++ /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
++ if (obj->myDev->isYaffs2) {
++ unlinkOp = (newDir == obj->myDev->unlinkedDir);
++ } else {
++ unlinkOp = (newDir == obj->myDev->unlinkedDir
++ && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
++ }
++
++ deleteOp = (newDir == obj->myDev->deletedDir);
++
++ existingTarget = yaffs_FindObjectByName(newDir, newName);
++
++ /* If the object is a file going into the unlinked directory,
++ * then it is OK to just stuff it in since duplicate names are allowed.
++ * else only proceed if the new name does not exist and if we're putting
++ * it into a directory.
++ */
++ if ((unlinkOp ||
++ deleteOp ||
++ force ||
++ (shadows > 0) ||
++ !existingTarget) &&
++ newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
++ yaffs_SetObjectName(obj, newName);
++ obj->dirty = 1;
++
++ yaffs_AddObjectToDirectory(newDir, obj);
++
++ if (unlinkOp)
++ obj->unlinked = 1;
++
++ /* If it is a deletion then we mark it as a shrink for gc purposes. */
++ if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
++ return YAFFS_OK;
++ }
++
++ return YAFFS_FAIL;
++}
++
++int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
++ yaffs_Object * newDir, const YCHAR * newName)
++{
++ yaffs_Object *obj;
++ yaffs_Object *existingTarget;
++ int force = 0;
++
++#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
++ /* Special case for case insemsitive systems (eg. WinCE).
++ * While look-up is case insensitive, the name isn't.
++ * Therefore we might want to change x.txt to X.txt
++ */
++ if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
++ force = 1;
++ }
++#endif
++
++ obj = yaffs_FindObjectByName(oldDir, oldName);
++ /* Check new name to long. */
++ if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK &&
++ yaffs_strlen(newName) > YAFFS_MAX_ALIAS_LENGTH)
++ /* ENAMETOOLONG */
++ return YAFFS_FAIL;
++ else if (obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK &&
++ yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
++ /* ENAMETOOLONG */
++ return YAFFS_FAIL;
++
++ if (obj && obj->renameAllowed) {
++
++ /* Now do the handling for an existing target, if there is one */
++
++ existingTarget = yaffs_FindObjectByName(newDir, newName);
++ if (existingTarget &&
++ existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
++ !list_empty(&existingTarget->variant.directoryVariant.children)) {
++ /* There is a target that is a non-empty directory, so we fail */
++ return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
++ } else if (existingTarget && existingTarget != obj) {
++ /* Nuke the target first, using shadowing,
++ * but only if it isn't the same object
++ */
++ yaffs_ChangeObjectName(obj, newDir, newName, force,
++ existingTarget->objectId);
++ yaffs_UnlinkObject(existingTarget);
++ }
++
++ return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
++ }
++ return YAFFS_FAIL;
++}
++
++/*------------------------- Block Management and Page Allocation ----------------*/
++
++static int yaffs_InitialiseBlocks(yaffs_Device * dev)
++{
++ int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
++
++ dev->allocationBlock = -1; /* force it to get a new one */
++
++ /* Todo we're assuming the malloc will pass. */
++ dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
++ if(!dev->blockInfo){
++ dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
++ dev->blockInfoAlt = 1;
++ }
++ else
++ dev->blockInfoAlt = 0;
++
++ /* Set up dynamic blockinfo stuff. */
++ dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
++ dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
++ if(!dev->chunkBits){
++ dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
++ dev->chunkBitsAlt = 1;
++ }
++ else
++ dev->chunkBitsAlt = 0;
++
++ if (dev->blockInfo && dev->chunkBits) {
++ memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
++ memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
++ return YAFFS_OK;
++ }
++
++ return YAFFS_FAIL;
++
++}
++
++static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
++{
++ if(dev->blockInfoAlt)
++ YFREE_ALT(dev->blockInfo);
++ else
++ YFREE(dev->blockInfo);
++ dev->blockInfoAlt = 0;
++
++ dev->blockInfo = NULL;
++
++ if(dev->chunkBitsAlt)
++ YFREE_ALT(dev->chunkBits);
++ else
++ YFREE(dev->chunkBits);
++ dev->chunkBitsAlt = 0;
++ dev->chunkBits = NULL;
++}
++
++static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
++ yaffs_BlockInfo * bi)
++{
++ int i;
++ __u32 seq;
++ yaffs_BlockInfo *b;
++
++ if (!dev->isYaffs2)
++ return 1; /* disqualification only applies to yaffs2. */
++
++ if (!bi->hasShrinkHeader)
++ return 1; /* can gc */
++
++ /* Find the oldest dirty sequence number if we don't know it and save it
++ * so we don't have to keep recomputing it.
++ */
++ if (!dev->oldestDirtySequence) {
++ seq = dev->sequenceNumber;
++
++ for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
++ i++) {
++ b = yaffs_GetBlockInfo(dev, i);
++ if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
++ (b->pagesInUse - b->softDeletions) <
++ dev->nChunksPerBlock && b->sequenceNumber < seq) {
++ seq = b->sequenceNumber;
++ }
++ }
++ dev->oldestDirtySequence = seq;
++ }
++
++ /* Can't do gc of this block if there are any blocks older than this one that have
++ * discarded pages.
++ */
++ return (bi->sequenceNumber <= dev->oldestDirtySequence);
++
++}
++
++/* FindDiretiestBlock is used to select the dirtiest block (or close enough)
++ * for garbage collection.
++ */
++
++static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
++ int aggressive)
++{
++
++ int b = dev->currentDirtyChecker;
++
++ int i;
++ int iterations;
++ int dirtiest = -1;
++ int pagesInUse;
++ int prioritised=0;
++ yaffs_BlockInfo *bi;
++ static int nonAggressiveSkip = 0;
++ int pendingPrioritisedExist = 0;
++
++ /* First let's see if we need to grab a prioritised block */
++ if(dev->hasPendingPrioritisedGCs){
++ for(i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++){
++
++ bi = yaffs_GetBlockInfo(dev, i);
++ if(bi->gcPrioritise) {
++ pendingPrioritisedExist = 1;
++ if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
++ yaffs_BlockNotDisqualifiedFromGC(dev, bi)){
++ pagesInUse = (bi->pagesInUse - bi->softDeletions);
++ dirtiest = i;
++ prioritised = 1;
++ aggressive = 1; /* Fool the non-aggressive skip logiv below */
++ }
++ }
++ }
++
++ if(!pendingPrioritisedExist) /* None found, so we can clear this */
++ dev->hasPendingPrioritisedGCs = 0;
++ }
++
++ /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
++ * search harder.
++ * else (we're doing a leasurely gc), then we only bother to do this if the
++ * block has only a few pages in use.
++ */
++
++ nonAggressiveSkip--;
++
++ if (!aggressive && (nonAggressiveSkip > 0)) {
++ return -1;
++ }
++
++ if(!prioritised)
++ pagesInUse =
++ (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
++
++ if (aggressive) {
++ iterations =
++ dev->internalEndBlock - dev->internalStartBlock + 1;
++ } else {
++ iterations =
++ dev->internalEndBlock - dev->internalStartBlock + 1;
++ iterations = iterations / 16;
++ if (iterations > 200) {
++ iterations = 200;
++ }
++ }
++
++ for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
++ b++;
++ if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
++ b = dev->internalStartBlock;
++ }
++
++ if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR("**>> Block %d is not valid" TENDSTR), b));
++ YBUG();
++ }
++
++ bi = yaffs_GetBlockInfo(dev, b);
++
++#if 0
++ if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
++ dirtiest = b;
++ pagesInUse = 0;
++ }
++ else
++#endif
++
++ if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
++ (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
++ yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
++ dirtiest = b;
++ pagesInUse = (bi->pagesInUse - bi->softDeletions);
++ }
++ }
++
++ dev->currentDirtyChecker = b;
++
++ if (dirtiest > 0) {
++ T(YAFFS_TRACE_GC,
++ (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
++ dev->nChunksPerBlock - pagesInUse,prioritised));
++ }
++
++ dev->oldestDirtySequence = 0;
++
++ if (dirtiest > 0) {
++ nonAggressiveSkip = 4;
++ }
++
++ return dirtiest;
++}
++
++static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
++{
++ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
++
++ int erasedOk = 0;
++
++ /* If the block is still healthy erase it and mark as clean.
++ * If the block has had a data failure, then retire it.
++ */
++
++ T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
++ (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
++ blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
++
++ bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
++
++ if (!bi->needsRetiring) {
++ yaffs_InvalidateCheckpoint(dev);
++ erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
++ if (!erasedOk) {
++ dev->nErasureFailures++;
++ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
++ (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
++ }
++ }
++
++ if (erasedOk && (yaffs_traceMask & YAFFS_TRACE_ERASE)) {
++ int i;
++ for (i = 0; i < dev->nChunksPerBlock; i++) {
++ if (!yaffs_CheckChunkErased
++ (dev, blockNo * dev->nChunksPerBlock + i)) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ (">>Block %d erasure supposedly OK, but chunk %d not erased"
++ TENDSTR), blockNo, i));
++ }
++ }
++ }
++
++ if (erasedOk) {
++ /* Clean it up... */
++ bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
++ dev->nErasedBlocks++;
++ bi->pagesInUse = 0;
++ bi->softDeletions = 0;
++ bi->hasShrinkHeader = 0;
++ bi->skipErasedCheck = 1; /* This is clean, so no need to check */
++ bi->gcPrioritise = 0;
++ yaffs_ClearChunkBits(dev, blockNo);
++
++ T(YAFFS_TRACE_ERASE,
++ (TSTR("Erased block %d" TENDSTR), blockNo));
++ } else {
++ dev->nFreeChunks -= dev->nChunksPerBlock; /* We lost a block of free space */
++
++ yaffs_RetireBlock(dev, blockNo);
++ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
++ (TSTR("**>> Block %d retired" TENDSTR), blockNo));
++ }
++}
++
++static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
++{
++ int i;
++
++ yaffs_BlockInfo *bi;
++
++ if (dev->nErasedBlocks < 1) {
++ /* Hoosterman we've got a problem.
++ * Can't get space to gc
++ */
++ T(YAFFS_TRACE_ERROR,
++ (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
++
++ return -1;
++ }
++
++ /* Find an empty block. */
++
++ for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
++ dev->allocationBlockFinder++;
++ if (dev->allocationBlockFinder < dev->internalStartBlock
++ || dev->allocationBlockFinder > dev->internalEndBlock) {
++ dev->allocationBlockFinder = dev->internalStartBlock;
++ }
++
++ bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
++
++ if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
++ bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
++ dev->sequenceNumber++;
++ bi->sequenceNumber = dev->sequenceNumber;
++ dev->nErasedBlocks--;
++ T(YAFFS_TRACE_ALLOCATE,
++ (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
++ dev->allocationBlockFinder, dev->sequenceNumber,
++ dev->nErasedBlocks));
++ return dev->allocationBlockFinder;
++ }
++ }
++
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR
++ ("yaffs tragedy: no more eraased blocks, but there should have been %d"
++ TENDSTR), dev->nErasedBlocks));
++
++ return -1;
++}
++
++
++// Check if there's space to allocate...
++// Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
++static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
++{
++ int reservedChunks;
++ int reservedBlocks = dev->nReservedBlocks;
++ int checkpointBlocks;
++
++ checkpointBlocks = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
++ if(checkpointBlocks < 0)
++ checkpointBlocks = 0;
++
++ reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
++
++ return (dev->nFreeChunks > reservedChunks);
++}
++
++static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr)
++{
++ int retVal;
++ yaffs_BlockInfo *bi;
++
++ if (dev->allocationBlock < 0) {
++ /* Get next block to allocate off */
++ dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
++ dev->allocationPage = 0;
++ }
++
++ if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
++ /* Not enough space to allocate unless we're allowed to use the reserve. */
++ return -1;
++ }
++
++ if (dev->nErasedBlocks < dev->nReservedBlocks
++ && dev->allocationPage == 0) {
++ T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
++ }
++
++ /* Next page please.... */
++ if (dev->allocationBlock >= 0) {
++ bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
++
++ retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
++ dev->allocationPage;
++ bi->pagesInUse++;
++ yaffs_SetChunkBit(dev, dev->allocationBlock,
++ dev->allocationPage);
++
++ dev->allocationPage++;
++
++ dev->nFreeChunks--;
++
++ /* If the block is full set the state to full */
++ if (dev->allocationPage >= dev->nChunksPerBlock) {
++ bi->blockState = YAFFS_BLOCK_STATE_FULL;
++ dev->allocationBlock = -1;
++ }
++
++ if(blockUsedPtr)
++ *blockUsedPtr = bi;
++
++ return retVal;
++ }
++
++ T(YAFFS_TRACE_ERROR,
++ (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
++
++ return -1;
++}
++
++static int yaffs_GetErasedChunks(yaffs_Device * dev)
++{
++ int n;
++
++ n = dev->nErasedBlocks * dev->nChunksPerBlock;
++
++ if (dev->allocationBlock > 0) {
++ n += (dev->nChunksPerBlock - dev->allocationPage);
++ }
++
++ return n;
++
++}
++
++static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
++{
++ int oldChunk;
++ int newChunk;
++ int chunkInBlock;
++ int markNAND;
++ int retVal = YAFFS_OK;
++ int cleanups = 0;
++ int i;
++ int isCheckpointBlock;
++
++ int chunksBefore = yaffs_GetErasedChunks(dev);
++ int chunksAfter;
++
++ yaffs_ExtendedTags tags;
++
++ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
++
++ yaffs_Object *object;
++
++ isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
++
++ bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
++
++ T(YAFFS_TRACE_TRACING,
++ (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
++ bi->pagesInUse, bi->hasShrinkHeader));
++
++ /*yaffs_VerifyFreeChunks(dev); */
++
++ bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
++
++ /* Take off the number of soft deleted entries because
++ * they're going to get really deleted during GC.
++ */
++ dev->nFreeChunks -= bi->softDeletions;
++
++ dev->isDoingGC = 1;
++
++ if (isCheckpointBlock ||
++ !yaffs_StillSomeChunkBits(dev, block)) {
++ T(YAFFS_TRACE_TRACING,
++ (TSTR
++ ("Collecting block %d that has no chunks in use" TENDSTR),
++ block));
++ yaffs_BlockBecameDirty(dev, block);
++ } else {
++
++ __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
++
++ for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
++ chunkInBlock < dev->nChunksPerBlock
++ && yaffs_StillSomeChunkBits(dev, block);
++ chunkInBlock++, oldChunk++) {
++ if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
++
++ /* This page is in use and might need to be copied off */
++
++ markNAND = 1;
++
++ yaffs_InitialiseTags(&tags);
++
++ yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
++ buffer, &tags);
++
++ object =
++ yaffs_FindObjectByNumber(dev,
++ tags.objectId);
++
++ T(YAFFS_TRACE_GC_DETAIL,
++ (TSTR
++ ("Collecting page %d, %d %d %d " TENDSTR),
++ chunkInBlock, tags.objectId, tags.chunkId,
++ tags.byteCount));
++
++ if (!object) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("page %d in gc has no object "
++ TENDSTR), oldChunk));
++ }
++
++ if (object && object->deleted
++ && tags.chunkId != 0) {
++ /* Data chunk in a 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.
++ */
++
++ object->nDataChunks--;
++
++ if (object->nDataChunks <= 0) {
++ /* remeber to clean up the object */
++ dev->gcCleanupList[cleanups] =
++ tags.objectId;
++ cleanups++;
++ }
++ markNAND = 0;
++ } else if (0
++ /* Todo object && object->deleted && object->nDataChunks == 0 */
++ ) {
++ /* Deleted object header with no data chunks.
++ * Can be discarded and the file deleted.
++ */
++ object->chunkId = 0;
++ yaffs_FreeTnode(object->myDev,
++ object->variant.
++ fileVariant.top);
++ object->variant.fileVariant.top = NULL;
++ yaffs_DoGenericObjectDeletion(object);
++
++ } 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.serialNumber++;
++
++ dev->nGCCopies++;
++
++ if (tags.chunkId == 0) {
++ /* It is an object Id,
++ * We need to nuke the shrinkheader flags first
++ * We no longer want the shrinkHeader flag since its work is done
++ * and if it is left in place it will mess up scanning.
++ * Also, clear out any shadowing stuff
++ */
++
++ yaffs_ObjectHeader *oh;
++ oh = (yaffs_ObjectHeader *)buffer;
++ oh->isShrink = 0;
++ oh->shadowsObject = -1;
++ tags.extraShadows = 0;
++ tags.extraIsShrinkHeader = 0;
++ }
++
++ newChunk =
++ yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
++
++ if (newChunk < 0) {
++ retVal = YAFFS_FAIL;
++ } else {
++
++ /* Ok, now fix up the Tnodes etc. */
++
++ if (tags.chunkId == 0) {
++ /* It's a header */
++ object->chunkId = newChunk;
++ object->serial = tags.serialNumber;
++ } else {
++ /* It's a data chunk */
++ yaffs_PutChunkIntoFile
++ (object,
++ tags.chunkId,
++ newChunk, 0);
++ }
++ }
++ }
++
++ yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
++
++ }
++ }
++
++ yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
++
++
++ /* Do any required cleanups */
++ for (i = 0; i < cleanups; i++) {
++ /* Time to delete the file too */
++ object =
++ yaffs_FindObjectByNumber(dev,
++ dev->gcCleanupList[i]);
++ if (object) {
++ yaffs_FreeTnode(dev,
++ object->variant.fileVariant.
++ top);
++ object->variant.fileVariant.top = NULL;
++ T(YAFFS_TRACE_GC,
++ (TSTR
++ ("yaffs: About to finally delete object %d"
++ TENDSTR), object->objectId));
++ yaffs_DoGenericObjectDeletion(object);
++ object->myDev->nDeletedFiles--;
++ }
++
++ }
++
++ }
++
++ if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
++ T(YAFFS_TRACE_GC,
++ (TSTR
++ ("gc did not increase free chunks before %d after %d"
++ TENDSTR), chunksBefore, chunksAfter));
++ }
++
++ dev->isDoingGC = 0;
++
++ return YAFFS_OK;
++}
++
++/* 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 will only accept 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_CheckGarbageCollection(yaffs_Device * dev)
++{
++ int block;
++ int aggressive;
++ int gcOk = YAFFS_OK;
++ int maxTries = 0;
++
++ int checkpointBlockAdjust;
++
++ if (dev->isDoingGC) {
++ /* Bail out so we don't get recursive gc */
++ return YAFFS_OK;
++ }
++
++ /* This loop should pass the first time.
++ * We'll only see looping here if the erase of the collected block fails.
++ */
++
++ do {
++ maxTries++;
++
++ checkpointBlockAdjust = (dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint);
++ if(checkpointBlockAdjust < 0)
++ checkpointBlockAdjust = 0;
++
++ if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust)) {
++ /* We need a block soon...*/
++ aggressive = 1;
++ } else {
++ /* We're in no hurry */
++ aggressive = 0;
++ }
++
++ block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
++
++ if (block > 0) {
++ dev->garbageCollections++;
++ if (!aggressive) {
++ dev->passiveGarbageCollections++;
++ }
++
++ T(YAFFS_TRACE_GC,
++ (TSTR
++ ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
++ dev->nErasedBlocks, aggressive));
++
++ gcOk = yaffs_GarbageCollectBlock(dev, block);
++ }
++
++ if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
++ T(YAFFS_TRACE_GC,
++ (TSTR
++ ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
++ TENDSTR), dev->nErasedBlocks, maxTries, block));
++ }
++ } while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
++ && (maxTries < 2));
++
++ return aggressive ? gcOk : YAFFS_OK;
++}
++
++/*------------------------- TAGS --------------------------------*/
++
++static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
++ int chunkInObject)
++{
++ return (tags->chunkId == chunkInObject &&
++ tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
++
++}
++
++
++/*-------------------- Data file manipulation -----------------*/
++
++static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
++ yaffs_ExtendedTags * tags)
++{
++ /*Get the Tnode, then get the level 0 offset chunk offset */
++ yaffs_Tnode *tn;
++ int theChunk = -1;
++ yaffs_ExtendedTags localTags;
++ int retVal = -1;
++
++ yaffs_Device *dev = in->myDev;
++
++ if (!tags) {
++ /* Passed a NULL, so use our own tags space */
++ tags = &localTags;
++ }
++
++ tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
++
++ if (tn) {
++ theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
++
++ retVal =
++ yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
++ chunkInInode);
++ }
++ return retVal;
++}
++
++static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
++ yaffs_ExtendedTags * tags)
++{
++ /* Get the Tnode, then get the level 0 offset chunk offset */
++ yaffs_Tnode *tn;
++ int theChunk = -1;
++ yaffs_ExtendedTags localTags;
++
++ yaffs_Device *dev = in->myDev;
++ int retVal = -1;
++
++ if (!tags) {
++ /* Passed a NULL, so use our own tags space */
++ tags = &localTags;
++ }
++
++ tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
++
++ if (tn) {
++
++ theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
++
++ retVal =
++ yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
++ chunkInInode);
++
++ /* Delete the entry in the filestructure (if found) */
++ if (retVal != -1) {
++ yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
++ }
++ } else {
++ /*T(("No level 0 found for %d\n", chunkInInode)); */
++ }
++
++ if (retVal == -1) {
++ /* T(("Could not find %d to delete\n",chunkInInode)); */
++ }
++ return retVal;
++}
++
++#ifdef YAFFS_PARANOID
++
++static int yaffs_CheckFileSanity(yaffs_Object * in)
++{
++ int chunk;
++ int nChunks;
++ int fSize;
++ int failed = 0;
++ int objId;
++ yaffs_Tnode *tn;
++ yaffs_Tags localTags;
++ yaffs_Tags *tags = &localTags;
++ int theChunk;
++ int chunkDeleted;
++
++ if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
++ /* T(("Object not a file\n")); */
++ return YAFFS_FAIL;
++ }
++
++ objId = in->objectId;
++ fSize = in->variant.fileVariant.fileSize;
++ nChunks =
++ (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
++
++ for (chunk = 1; chunk <= nChunks; chunk++) {
++ tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
++ chunk);
++
++ if (tn) {
++
++ theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
++
++ if (yaffs_CheckChunkBits
++ (dev, theChunk / dev->nChunksPerBlock,
++ theChunk % dev->nChunksPerBlock)) {
++
++ yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
++ tags,
++ &chunkDeleted);
++ if (yaffs_TagsMatch
++ (tags, in->objectId, chunk, chunkDeleted)) {
++ /* found it; */
++
++ }
++ } else {
++
++ failed = 1;
++ }
++
++ } else {
++ /* T(("No level 0 found for %d\n", chunk)); */
++ }
++ }
++
++ return failed ? YAFFS_FAIL : YAFFS_OK;
++}
++
++#endif
++
++static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
++ int chunkInNAND, int inScan)
++{
++ /* NB inScan is zero unless scanning.
++ * For forward scanning, inScan is > 0;
++ * for backward scanning inScan is < 0
++ */
++
++ yaffs_Tnode *tn;
++ yaffs_Device *dev = in->myDev;
++ int existingChunk;
++ yaffs_ExtendedTags existingTags;
++ yaffs_ExtendedTags newTags;
++ unsigned existingSerial, newSerial;
++
++ if (in->variantType != 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 (!inScan) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("yaffs tragedy:attempt to put data chunk into a non-file"
++ TENDSTR)));
++ YBUG();
++ }
++
++ yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
++ return YAFFS_OK;
++ }
++
++ tn = yaffs_AddOrFindLevel0Tnode(dev,
++ &in->variant.fileVariant,
++ chunkInInode,
++ NULL);
++ if (!tn) {
++ return YAFFS_FAIL;
++ }
++
++ existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
++
++ if (inScan != 0) {
++ /* If we're scanning then we need to test for duplicates
++ * NB This does not need to be efficient since it should only ever
++ * 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 (existingChunk != 0) {
++ /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
++ * 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.
++ * Forward scanning YAFFS2: The new one is what we use, dump the old one.
++ * YAFFS1: Get both sets of tags and compare serial numbers.
++ */
++
++ if (inScan > 0) {
++ /* Only do this for forward scanning */
++ yaffs_ReadChunkWithTagsFromNAND(dev,
++ chunkInNAND,
++ NULL, &newTags);
++
++ /* Do a proper find */
++ existingChunk =
++ yaffs_FindChunkInFile(in, chunkInInode,
++ &existingTags);
++ }
++
++ if (existingChunk <= 0) {
++ /*Hoosterman - how did this happen? */
++
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("yaffs tragedy: existing chunk < 0 in scan"
++ TENDSTR)));
++
++ }
++
++ /* NB The deleted flags should be false, otherwise the chunks will
++ * not be loaded during a scan
++ */
++
++ newSerial = newTags.serialNumber;
++ existingSerial = existingTags.serialNumber;
++
++ if ((inScan > 0) &&
++ (in->myDev->isYaffs2 ||
++ existingChunk <= 0 ||
++ ((existingSerial + 1) & 3) == newSerial)) {
++ /* Forward scanning.
++ * Use new
++ * Delete the old one and drop through to update the tnode
++ */
++ yaffs_DeleteChunk(dev, existingChunk, 1,
++ __LINE__);
++ } else {
++ /* Backward scanning or we want to use the existing one
++ * Use existing.
++ * Delete the new one and return early so that the tnode isn't changed
++ */
++ yaffs_DeleteChunk(dev, chunkInNAND, 1,
++ __LINE__);
++ return YAFFS_OK;
++ }
++ }
++
++ }
++
++ if (existingChunk == 0) {
++ in->nDataChunks++;
++ }
++
++ yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
++
++ return YAFFS_OK;
++}
++
++static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
++ __u8 * buffer)
++{
++ int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
++
++ if (chunkInNAND >= 0) {
++ return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
++ buffer,NULL);
++ } else {
++ T(YAFFS_TRACE_NANDACCESS,
++ (TSTR("Chunk %d not found zero instead" TENDSTR),
++ chunkInNAND));
++ /* get sane (zero) data if you read a hole */
++ memset(buffer, 0, in->myDev->nDataBytesPerChunk);
++ return 0;
++ }
++
++}
++
++void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
++{
++ int block;
++ int page;
++ yaffs_ExtendedTags tags;
++ yaffs_BlockInfo *bi;
++
++ if (chunkId <= 0)
++ return;
++
++ dev->nDeletions++;
++ block = chunkId / dev->nChunksPerBlock;
++ page = chunkId % dev->nChunksPerBlock;
++
++ bi = yaffs_GetBlockInfo(dev, block);
++
++ T(YAFFS_TRACE_DELETION,
++ (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
++
++ if (markNAND &&
++ bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
++
++ yaffs_InitialiseTags(&tags);
++
++ tags.chunkDeleted = 1;
++
++ yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
++ yaffs_HandleUpdateChunk(dev, chunkId, &tags);
++ } else {
++ dev->nUnmarkedDeletions++;
++ }
++
++ /* Pull out of the management area.
++ * If the whole block became dirty, this will kick off an erasure.
++ */
++ if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
++ bi->blockState == YAFFS_BLOCK_STATE_FULL ||
++ bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
++ bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
++ dev->nFreeChunks++;
++
++ yaffs_ClearChunkBit(dev, block, page);
++
++ bi->pagesInUse--;
++
++ if (bi->pagesInUse == 0 &&
++ !bi->hasShrinkHeader &&
++ bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
++ bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
++ yaffs_BlockBecameDirty(dev, block);
++ }
++
++ } else {
++ /* T(("Bad news deleting chunk %d\n",chunkId)); */
++ }
++
++}
++
++static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
++ const __u8 * buffer, int nBytes,
++ int useReserve)
++{
++ /* Find old chunk Need to do this to get serial number
++ * Write new one and patch into tree.
++ * Invalidate old tags.
++ */
++
++ int prevChunkId;
++ yaffs_ExtendedTags prevTags;
++
++ int newChunkId;
++ yaffs_ExtendedTags newTags;
++
++ yaffs_Device *dev = in->myDev;
++
++ yaffs_CheckGarbageCollection(dev);
++
++ /* Get the previous chunk at this location in the file if it exists */
++ prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
++
++ /* Set up new tags */
++ yaffs_InitialiseTags(&newTags);
++
++ newTags.chunkId = chunkInInode;
++ newTags.objectId = in->objectId;
++ newTags.serialNumber =
++ (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
++ newTags.byteCount = nBytes;
++
++ newChunkId =
++ yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
++ useReserve);
++
++ if (newChunkId >= 0) {
++ yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
++
++ if (prevChunkId >= 0) {
++ yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
++
++ }
++
++ yaffs_CheckFileSanity(in);
++ }
++ return newChunkId;
++
++}
++
++/* UpdateObjectHeader updates the header on NAND for an object.
++ * If name is not NULL, then that new name is used.
++ */
++int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
++ int isShrink, int shadows)
++{
++
++ yaffs_BlockInfo *bi;
++
++ yaffs_Device *dev = in->myDev;
++
++ int prevChunkId;
++ int retVal = 0;
++ int result = 0;
++
++ int newChunkId;
++ yaffs_ExtendedTags newTags;
++
++ __u8 *buffer = NULL;
++ YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
++
++ yaffs_ObjectHeader *oh = NULL;
++
++ if (!in->fake || force) {
++
++ yaffs_CheckGarbageCollection(dev);
++
++ buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
++ oh = (yaffs_ObjectHeader *) buffer;
++
++ prevChunkId = in->chunkId;
++
++ if (prevChunkId >= 0) {
++ result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
++ buffer, NULL);
++ memcpy(oldName, oh->name, sizeof(oh->name));
++ }
++
++ memset(buffer, 0xFF, dev->nDataBytesPerChunk);
++
++ oh->type = in->variantType;
++ oh->yst_mode = in->yst_mode;
++ oh->shadowsObject = shadows;
++
++#ifdef CONFIG_YAFFS_WINCE
++ oh->win_atime[0] = in->win_atime[0];
++ oh->win_ctime[0] = in->win_ctime[0];
++ oh->win_mtime[0] = in->win_mtime[0];
++ oh->win_atime[1] = in->win_atime[1];
++ oh->win_ctime[1] = in->win_ctime[1];
++ oh->win_mtime[1] = in->win_mtime[1];
++#else
++ oh->yst_uid = in->yst_uid;
++ oh->yst_gid = in->yst_gid;
++ oh->yst_atime = in->yst_atime;
++ oh->yst_mtime = in->yst_mtime;
++ oh->yst_ctime = in->yst_ctime;
++ oh->yst_rdev = in->yst_rdev;
++#endif
++ if (in->parent) {
++ oh->parentObjectId = in->parent->objectId;
++ } else {
++ oh->parentObjectId = 0;
++ }
++
++ if (name && *name) {
++ memset(oh->name, 0, sizeof(oh->name));
++ yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
++ } else if (prevChunkId) {
++ memcpy(oh->name, oldName, sizeof(oh->name));
++ } else {
++ memset(oh->name, 0, sizeof(oh->name));
++ }
++
++ oh->isShrink = isShrink;
++
++ switch (in->variantType) {
++ case YAFFS_OBJECT_TYPE_UNKNOWN:
++ /* Should not happen */
++ break;
++ case YAFFS_OBJECT_TYPE_FILE:
++ oh->fileSize =
++ (oh->parentObjectId == YAFFS_OBJECTID_DELETED
++ || oh->parentObjectId ==
++ YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
++ fileVariant.fileSize;
++ break;
++ case YAFFS_OBJECT_TYPE_HARDLINK:
++ oh->equivalentObjectId =
++ in->variant.hardLinkVariant.equivalentObjectId;
++ break;
++ case YAFFS_OBJECT_TYPE_SPECIAL:
++ /* Do nothing */
++ break;
++ case YAFFS_OBJECT_TYPE_DIRECTORY:
++ /* Do nothing */
++ break;
++ case YAFFS_OBJECT_TYPE_SYMLINK:
++ yaffs_strncpy(oh->alias,
++ in->variant.symLinkVariant.alias,
++ YAFFS_MAX_ALIAS_LENGTH);
++ oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
++ break;
++ }
++
++ /* Tags */
++ yaffs_InitialiseTags(&newTags);
++ in->serial++;
++ newTags.chunkId = 0;
++ newTags.objectId = in->objectId;
++ newTags.serialNumber = in->serial;
++
++ /* Add extra info for file header */
++
++ newTags.extraHeaderInfoAvailable = 1;
++ newTags.extraParentObjectId = oh->parentObjectId;
++ newTags.extraFileLength = oh->fileSize;
++ newTags.extraIsShrinkHeader = oh->isShrink;
++ newTags.extraEquivalentObjectId = oh->equivalentObjectId;
++ newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
++ newTags.extraObjectType = in->variantType;
++
++ /* Create new chunk in NAND */
++ newChunkId =
++ yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
++ (prevChunkId >= 0) ? 1 : 0);
++
++ if (newChunkId >= 0) {
++
++ in->chunkId = newChunkId;
++
++ if (prevChunkId >= 0) {
++ yaffs_DeleteChunk(dev, prevChunkId, 1,
++ __LINE__);
++ }
++
++ if(!yaffs_ObjectHasCachedWriteData(in))
++ in->dirty = 0;
++
++ /* If this was a shrink, then mark the block that the chunk lives on */
++ if (isShrink) {
++ bi = yaffs_GetBlockInfo(in->myDev,
++ newChunkId /in->myDev-> nChunksPerBlock);
++ bi->hasShrinkHeader = 1;
++ }
++
++ }
++
++ retVal = newChunkId;
++
++ }
++
++ if (buffer)
++ yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
++
++ return retVal;
++}
++
++/*------------------------ Short Operations Cache ----------------------------------------
++ * In many situations where there is no high level buffering (eg WinCE) 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 aand the short op cache provides write
++ * buffering.
++ *
++ * There are a limited number (~10) of cache chunks per device so that we don't
++ * need a very intelligent search.
++ */
++
++static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
++{
++ yaffs_Device *dev = obj->myDev;
++ int i;
++ yaffs_ChunkCache *cache;
++ int nCaches = obj->myDev->nShortOpCaches;
++
++ for(i = 0; i < nCaches; i++){
++ cache = &dev->srCache[i];
++ if (cache->object == obj &&
++ cache->dirty)
++ return 1;
++ }
++
++ return 0;
++}
++
++
++static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
++{
++ yaffs_Device *dev = obj->myDev;
++ int lowest = -99; /* Stop compiler whining. */
++ int i;
++ yaffs_ChunkCache *cache;
++ int chunkWritten = 0;
++ int nCaches = obj->myDev->nShortOpCaches;
++
++ if (nCaches > 0) {
++ do {
++ cache = NULL;
++
++ /* Find the dirty cache for this object with the lowest chunk id. */
++ for (i = 0; i < nCaches; i++) {
++ if (dev->srCache[i].object == obj &&
++ dev->srCache[i].dirty) {
++ if (!cache
++ || dev->srCache[i].chunkId <
++ lowest) {
++ cache = &dev->srCache[i];
++ lowest = cache->chunkId;
++ }
++ }
++ }
++
++ if (cache && !cache->locked) {
++ /* Write it out and free it up */
++
++ chunkWritten =
++ yaffs_WriteChunkDataToObject(cache->object,
++ cache->chunkId,
++ cache->data,
++ cache->nBytes,
++ 1);
++ cache->dirty = 0;
++ cache->object = NULL;
++ }
++
++ } while (cache && chunkWritten > 0);
++
++ if (cache) {
++ /* Hoosterman, disk full while writing cache out. */
++ T(YAFFS_TRACE_ERROR,
++ (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
++
++ }
++ }
++
++}
++
++/*yaffs_FlushEntireDeviceCache(dev)
++ *
++ *
++ */
++
++void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
++{
++ yaffs_Object *obj;
++ int nCaches = dev->nShortOpCaches;
++ 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 < nCaches && !obj; i++) {
++ if (dev->srCache[i].object &&
++ dev->srCache[i].dirty)
++ obj = dev->srCache[i].object;
++
++ }
++ if(obj)
++ yaffs_FlushFilesChunkCache(obj);
++
++ } while(obj);
++
++}
++
++
++/* Grab us a 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 yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
++{
++ int i;
++ int usage;
++ int theOne;
++
++ if (dev->nShortOpCaches > 0) {
++ for (i = 0; i < dev->nShortOpCaches; i++) {
++ if (!dev->srCache[i].object)
++ return &dev->srCache[i];
++ }
++
++ return NULL;
++
++ theOne = -1;
++ usage = 0; /* just to stop the compiler grizzling */
++
++ for (i = 0; i < dev->nShortOpCaches; i++) {
++ if (!dev->srCache[i].dirty &&
++ ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
++ theOne < 0)) {
++ usage = dev->srCache[i].lastUse;
++ theOne = i;
++ }
++ }
++
++
++ return theOne >= 0 ? &dev->srCache[theOne] : NULL;
++ } else {
++ return NULL;
++ }
++
++}
++
++static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
++{
++ yaffs_ChunkCache *cache;
++ yaffs_Object *theObj;
++ int usage;
++ int i;
++ int pushout;
++
++ if (dev->nShortOpCaches > 0) {
++ /* Try find a non-dirty one... */
++
++ cache = yaffs_GrabChunkCacheWorker(dev);
++
++ if (!cache) {
++ /* They were all dirty, find the last recently used object and flush
++ * its cache, then find again.
++ * NB what's here is not very accurate, we actually flush the object
++ * the last recently used page.
++ */
++
++ /* With locking we can't assume we can use entry zero */
++
++ theObj = NULL;
++ usage = -1;
++ cache = NULL;
++ pushout = -1;
++
++ for (i = 0; i < dev->nShortOpCaches; i++) {
++ if (dev->srCache[i].object &&
++ !dev->srCache[i].locked &&
++ (dev->srCache[i].lastUse < usage || !cache))
++ {
++ usage = dev->srCache[i].lastUse;
++ theObj = dev->srCache[i].object;
++ cache = &dev->srCache[i];
++ pushout = i;
++ }
++ }
++
++ if (!cache || cache->dirty) {
++ /* Flush and try again */
++ yaffs_FlushFilesChunkCache(theObj);
++ cache = yaffs_GrabChunkCacheWorker(dev);
++ }
++
++ }
++ return cache;
++ } else
++ return NULL;
++
++}
++
++/* Find a cached chunk */
++static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
++ int chunkId)
++{
++ yaffs_Device *dev = obj->myDev;
++ int i;
++ if (dev->nShortOpCaches > 0) {
++ for (i = 0; i < dev->nShortOpCaches; i++) {
++ if (dev->srCache[i].object == obj &&
++ dev->srCache[i].chunkId == chunkId) {
++ dev->cacheHits++;
++
++ return &dev->srCache[i];
++ }
++ }
++ }
++ return NULL;
++}
++
++/* Mark the chunk for the least recently used algorithym */
++static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
++ int isAWrite)
++{
++
++ if (dev->nShortOpCaches > 0) {
++ if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
++ /* Reset the cache usages */
++ int i;
++ for (i = 1; i < dev->nShortOpCaches; i++) {
++ dev->srCache[i].lastUse = 0;
++ }
++ dev->srLastUse = 0;
++ }
++
++ dev->srLastUse++;
++
++ cache->lastUse = dev->srLastUse;
++
++ if (isAWrite) {
++ 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_InvalidateChunkCache(yaffs_Object * object, int chunkId)
++{
++ if (object->myDev->nShortOpCaches > 0) {
++ yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
++
++ 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_InvalidateWholeChunkCache(yaffs_Object * in)
++{
++ int i;
++ yaffs_Device *dev = in->myDev;
++
++ if (dev->nShortOpCaches > 0) {
++ /* Invalidate it. */
++ for (i = 0; i < dev->nShortOpCaches; i++) {
++ if (dev->srCache[i].object == in) {
++ dev->srCache[i].object = NULL;
++ }
++ }
++ }
++}
++
++/*--------------------- Checkpointing --------------------*/
++
++
++static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
++{
++ yaffs_CheckpointValidity cp;
++ cp.structType = sizeof(cp);
++ cp.magic = YAFFS_MAGIC;
++ cp.version = YAFFS_CHECKPOINT_VERSION;
++ cp.head = (head) ? 1 : 0;
++
++ return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
++ 1 : 0;
++}
++
++static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
++{
++ yaffs_CheckpointValidity cp;
++ int ok;
++
++ ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
++
++ if(ok)
++ ok = (cp.structType == sizeof(cp)) &&
++ (cp.magic == YAFFS_MAGIC) &&
++ (cp.version == YAFFS_CHECKPOINT_VERSION) &&
++ (cp.head == ((head) ? 1 : 0));
++ return ok ? 1 : 0;
++}
++
++static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
++ yaffs_Device *dev)
++{
++ cp->nErasedBlocks = dev->nErasedBlocks;
++ cp->allocationBlock = dev->allocationBlock;
++ cp->allocationPage = dev->allocationPage;
++ cp->nFreeChunks = dev->nFreeChunks;
++
++ cp->nDeletedFiles = dev->nDeletedFiles;
++ cp->nUnlinkedFiles = dev->nUnlinkedFiles;
++ cp->nBackgroundDeletions = dev->nBackgroundDeletions;
++ cp->sequenceNumber = dev->sequenceNumber;
++ cp->oldestDirtySequence = dev->oldestDirtySequence;
++
++}
++
++static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
++ yaffs_CheckpointDevice *cp)
++{
++ dev->nErasedBlocks = cp->nErasedBlocks;
++ dev->allocationBlock = cp->allocationBlock;
++ dev->allocationPage = cp->allocationPage;
++ dev->nFreeChunks = cp->nFreeChunks;
++
++ dev->nDeletedFiles = cp->nDeletedFiles;
++ dev->nUnlinkedFiles = cp->nUnlinkedFiles;
++ dev->nBackgroundDeletions = cp->nBackgroundDeletions;
++ dev->sequenceNumber = cp->sequenceNumber;
++ dev->oldestDirtySequence = cp->oldestDirtySequence;
++}
++
++
++static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
++{
++ yaffs_CheckpointDevice cp;
++ __u32 nBytes;
++ __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
++
++ int ok;
++
++ /* Write device runtime values*/
++ yaffs_DeviceToCheckpointDevice(&cp,dev);
++ cp.structType = sizeof(cp);
++
++ ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
++
++ /* Write block info */
++ if(ok) {
++ nBytes = nBlocks * sizeof(yaffs_BlockInfo);
++ ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
++ }
++
++ /* Write chunk bits */
++ if(ok) {
++ nBytes = nBlocks * dev->chunkBitmapStride;
++ ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
++ }
++ return ok ? 1 : 0;
++
++}
++
++static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
++{
++ yaffs_CheckpointDevice cp;
++ __u32 nBytes;
++ __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
++
++ int ok;
++
++ ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
++ if(!ok)
++ return 0;
++
++ if(cp.structType != sizeof(cp))
++ return 0;
++
++
++ yaffs_CheckpointDeviceToDevice(dev,&cp);
++
++ nBytes = nBlocks * sizeof(yaffs_BlockInfo);
++
++ ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
++
++ if(!ok)
++ return 0;
++ nBytes = nBlocks * dev->chunkBitmapStride;
++
++ ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
++
++ return ok ? 1 : 0;
++}
++
++static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
++ yaffs_Object *obj)
++{
++
++ cp->objectId = obj->objectId;
++ cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
++ cp->chunkId = obj->chunkId;
++ cp->variantType = obj->variantType;
++ cp->deleted = obj->deleted;
++ cp->softDeleted = obj->softDeleted;
++ cp->unlinked = obj->unlinked;
++ cp->fake = obj->fake;
++ cp->renameAllowed = obj->renameAllowed;
++ cp->unlinkAllowed = obj->unlinkAllowed;
++ cp->serial = obj->serial;
++ cp->nDataChunks = obj->nDataChunks;
++
++ if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
++ cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
++ else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
++ cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
++}
++
++static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
++{
++
++ yaffs_Object *parent;
++
++ obj->objectId = cp->objectId;
++
++ if(cp->parentId)
++ parent = yaffs_FindOrCreateObjectByNumber(
++ obj->myDev,
++ cp->parentId,
++ YAFFS_OBJECT_TYPE_DIRECTORY);
++ else
++ parent = NULL;
++
++ if(parent)
++ yaffs_AddObjectToDirectory(parent, obj);
++
++ obj->chunkId = cp->chunkId;
++ obj->variantType = cp->variantType;
++ obj->deleted = cp->deleted;
++ obj->softDeleted = cp->softDeleted;
++ obj->unlinked = cp->unlinked;
++ obj->fake = cp->fake;
++ obj->renameAllowed = cp->renameAllowed;
++ obj->unlinkAllowed = cp->unlinkAllowed;
++ obj->serial = cp->serial;
++ obj->nDataChunks = cp->nDataChunks;
++
++ if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
++ obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
++ else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
++ obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
++
++ if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
++ obj->lazyLoaded = 1;
++}
++
++
++
++static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
++ __u32 level, int chunkOffset)
++{
++ int i;
++ yaffs_Device *dev = in->myDev;
++ int ok = 1;
++ int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
++
++ if (tn) {
++ if (level > 0) {
++
++ for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
++ if (tn->internal[i]) {
++ ok = yaffs_CheckpointTnodeWorker(in,
++ tn->internal[i],
++ level - 1,
++ (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
++ }
++ }
++ } else if (level == 0) {
++ __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
++ /* printf("write tnode at %d\n",baseOffset); */
++ ok = (yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset)) == sizeof(baseOffset));
++ if(ok)
++ ok = (yaffs_CheckpointWrite(dev,tn,nTnodeBytes) == nTnodeBytes);
++ }
++ }
++
++ return ok;
++
++}
++
++static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
++{
++ __u32 endMarker = ~0;
++ int ok = 1;
++
++ if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
++ ok = yaffs_CheckpointTnodeWorker(obj,
++ obj->variant.fileVariant.top,
++ obj->variant.fileVariant.topLevel,
++ 0);
++ if(ok)
++ ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) ==
++ sizeof(endMarker));
++ }
++
++ return ok ? 1 : 0;
++}
++
++static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
++{
++ __u32 baseChunk;
++ int ok = 1;
++ yaffs_Device *dev = obj->myDev;
++ yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
++ yaffs_Tnode *tn;
++
++ ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
++
++ while(ok && (~baseChunk)){
++ /* Read level 0 tnode */
++
++ /* printf("read tnode at %d\n",baseChunk); */
++ tn = yaffs_GetTnodeRaw(dev);
++ if(tn)
++ ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) ==
++ (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
++ else
++ ok = 0;
++
++ if(tn && ok){
++ ok = yaffs_AddOrFindLevel0Tnode(dev,
++ fileStructPtr,
++ baseChunk,
++ tn) ? 1 : 0;
++ }
++
++ if(ok)
++ ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
++
++ }
++
++ return ok ? 1 : 0;
++}
++
++
++static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
++{
++ yaffs_Object *obj;
++ yaffs_CheckpointObject cp;
++ int i;
++ int ok = 1;
++ struct list_head *lh;
++
++
++ /* 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->objectBucket[i].list) {
++ if (lh) {
++ obj = list_entry(lh, yaffs_Object, hashLink);
++ if (!obj->deferedFree) {
++ yaffs_ObjectToCheckpointObject(&cp,obj);
++ cp.structType = sizeof(cp);
++
++ T(YAFFS_TRACE_CHECKPOINT,(
++ TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
++ cp.objectId,cp.parentId,cp.variantType,cp.chunkId,(unsigned) obj));
++
++ ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
++
++ if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
++ ok = yaffs_WriteCheckpointTnodes(obj);
++ }
++ }
++ }
++ }
++ }
++
++ /* Dump end of list */
++ memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
++ cp.structType = sizeof(cp);
++
++ if(ok)
++ ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
++
++ return ok ? 1 : 0;
++}
++
++static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
++{
++ yaffs_Object *obj;
++ yaffs_CheckpointObject cp;
++ int ok = 1;
++ int done = 0;
++ yaffs_Object *hardList = NULL;
++
++ while(ok && !done) {
++ ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
++ if(cp.structType != sizeof(cp)) {
++ /* printf("structure parsing failed\n"); */
++ ok = 0;
++ }
++
++ if(ok && cp.objectId == ~0)
++ done = 1;
++ else if(ok){
++ obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("Checkpoint read object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
++ cp.objectId,cp.parentId,cp.variantType,cp.chunkId,(unsigned) obj));
++ if(obj) {
++ yaffs_CheckpointObjectToObject(obj,&cp);
++ if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
++ ok = yaffs_ReadCheckpointTnodes(obj);
++ } else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
++ obj->hardLinks.next =
++ (struct list_head *)
++ hardList;
++ hardList = obj;
++ }
++
++ }
++ }
++ }
++
++ if(ok)
++ yaffs_HardlinkFixup(dev,hardList);
++
++ return ok ? 1 : 0;
++}
++
++static int yaffs_WriteCheckpointData(yaffs_Device *dev)
++{
++
++ int ok;
++
++ ok = yaffs_CheckpointOpen(dev,1);
++
++ if(ok)
++ ok = yaffs_WriteCheckpointValidityMarker(dev,1);
++ if(ok)
++ ok = yaffs_WriteCheckpointDevice(dev);
++ if(ok)
++ ok = yaffs_WriteCheckpointObjects(dev);
++ if(ok)
++ ok = yaffs_WriteCheckpointValidityMarker(dev,0);
++
++ if(!yaffs_CheckpointClose(dev))
++ ok = 0;
++
++ if(ok)
++ dev->isCheckpointed = 1;
++ else
++ dev->isCheckpointed = 0;
++
++ return dev->isCheckpointed;
++}
++
++static int yaffs_ReadCheckpointData(yaffs_Device *dev)
++{
++ int ok;
++
++ ok = yaffs_CheckpointOpen(dev,0); /* open for read */
++
++ if(ok)
++ ok = yaffs_ReadCheckpointValidityMarker(dev,1);
++ if(ok)
++ ok = yaffs_ReadCheckpointDevice(dev);
++ if(ok)
++ ok = yaffs_ReadCheckpointObjects(dev);
++ if(ok)
++ ok = yaffs_ReadCheckpointValidityMarker(dev,0);
++
++
++
++ if(!yaffs_CheckpointClose(dev))
++ ok = 0;
++
++ if(ok)
++ dev->isCheckpointed = 1;
++ else
++ dev->isCheckpointed = 0;
++
++ return ok ? 1 : 0;
++
++}
++
++static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
++{
++ if(dev->isCheckpointed ||
++ dev->blocksInCheckpoint > 0){
++ dev->isCheckpointed = 0;
++ yaffs_CheckpointInvalidateStream(dev);
++ if(dev->superBlock && dev->markSuperBlockDirty)
++ dev->markSuperBlockDirty(dev->superBlock);
++ }
++}
++
++
++int yaffs_CheckpointSave(yaffs_Device *dev)
++{
++ yaffs_ReportOddballBlocks(dev);
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
++
++ if(!dev->isCheckpointed)
++ yaffs_WriteCheckpointData(dev);
++
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("save exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
++
++ return dev->isCheckpointed;
++}
++
++int yaffs_CheckpointRestore(yaffs_Device *dev)
++{
++ int retval;
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
++
++ retval = yaffs_ReadCheckpointData(dev);
++
++ T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
++
++ yaffs_ReportOddballBlocks(dev);
++
++ return retval;
++}
++
++/*--------------------- 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_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, loff_t offset,
++ int nBytes)
++{
++
++ int chunk;
++ int start;
++ int nToCopy;
++ int n = nBytes;
++ int nDone = 0;
++ yaffs_ChunkCache *cache;
++
++ yaffs_Device *dev;
++
++ dev = in->myDev;
++
++ while (n > 0) {
++ //chunk = offset / dev->nDataBytesPerChunk + 1;
++ //start = offset % dev->nDataBytesPerChunk;
++ yaffs_AddrToChunk(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->nDataBytesPerChunk) {
++ nToCopy = n;
++ } else {
++ nToCopy = dev->nDataBytesPerChunk - start;
++ }
++
++ cache = yaffs_FindChunkCache(in, chunk);
++
++ /* If the chunk is already in the cache or it is less than a whole chunk
++ * then use the cache (if there is caching)
++ * else bypass the cache.
++ */
++ if (cache || nToCopy != dev->nDataBytesPerChunk) {
++ if (dev->nShortOpCaches > 0) {
++
++ /* If we can't find the data in the cache, then load it up. */
++
++ if (!cache) {
++ cache = yaffs_GrabChunkCache(in->myDev);
++ cache->object = in;
++ cache->chunkId = chunk;
++ cache->dirty = 0;
++ cache->locked = 0;
++ yaffs_ReadChunkDataFromObject(in, chunk,
++ cache->
++ data);
++ cache->nBytes = 0;
++ }
++
++ yaffs_UseChunkCache(dev, cache, 0);
++
++ cache->locked = 1;
++
++#ifdef CONFIG_YAFFS_WINCE
++ yfsd_UnlockYAFFS(TRUE);
++#endif
++ memcpy(buffer, &cache->data[start], nToCopy);
++
++#ifdef CONFIG_YAFFS_WINCE
++ yfsd_LockYAFFS(TRUE);
++#endif
++ cache->locked = 0;
++ } else {
++ /* Read into the local buffer then copy..*/
++
++ __u8 *localBuffer =
++ yaffs_GetTempBuffer(dev, __LINE__);
++ yaffs_ReadChunkDataFromObject(in, chunk,
++ localBuffer);
++#ifdef CONFIG_YAFFS_WINCE
++ yfsd_UnlockYAFFS(TRUE);
++#endif
++ memcpy(buffer, &localBuffer[start], nToCopy);
++
++#ifdef CONFIG_YAFFS_WINCE
++ yfsd_LockYAFFS(TRUE);
++#endif
++ yaffs_ReleaseTempBuffer(dev, localBuffer,
++ __LINE__);
++ }
++
++ } else {
++#ifdef CONFIG_YAFFS_WINCE
++ __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
++
++ /* Under WinCE can't do direct transfer. Need to use a local buffer.
++ * This is because we otherwise screw up WinCE's memory mapper
++ */
++ yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
++
++#ifdef CONFIG_YAFFS_WINCE
++ yfsd_UnlockYAFFS(TRUE);
++#endif
++ memcpy(buffer, localBuffer, dev->nDataBytesPerChunk);
++
++#ifdef CONFIG_YAFFS_WINCE
++ yfsd_LockYAFFS(TRUE);
++ yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
++#endif
++
++#else
++ /* A full chunk. Read directly into the supplied buffer. */
++ yaffs_ReadChunkDataFromObject(in, chunk, buffer);
++#endif
++ }
++
++ n -= nToCopy;
++ offset += nToCopy;
++ buffer += nToCopy;
++ nDone += nToCopy;
++
++ }
++
++ return nDone;
++}
++
++int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, loff_t offset,
++ int nBytes, int writeThrough)
++{
++
++ int chunk;
++ int start;
++ int nToCopy;
++ int n = nBytes;
++ int nDone = 0;
++ int nToWriteBack;
++ int startOfWrite = offset;
++ int chunkWritten = 0;
++ int nBytesRead;
++
++ yaffs_Device *dev;
++
++ dev = in->myDev;
++
++ while (n > 0 && chunkWritten >= 0) {
++ //chunk = offset / dev->nDataBytesPerChunk + 1;
++ //start = offset % dev->nDataBytesPerChunk;
++ yaffs_AddrToChunk(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->nDataBytesPerChunk) {
++ nToCopy = n;
++
++ /* Now folks, to 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.
++ */
++
++ nBytesRead =
++ in->variant.fileVariant.fileSize -
++ ((chunk - 1) * dev->nDataBytesPerChunk);
++
++ if (nBytesRead > dev->nDataBytesPerChunk) {
++ nBytesRead = dev->nDataBytesPerChunk;
++ }
++
++ nToWriteBack =
++ (nBytesRead >
++ (start + n)) ? nBytesRead : (start + n);
++
++ } else {
++ nToCopy = dev->nDataBytesPerChunk - start;
++ nToWriteBack = dev->nDataBytesPerChunk;
++ }
++
++ if (nToCopy != dev->nDataBytesPerChunk) {
++ /* An incomplete start or end chunk (or maybe both start and end chunk) */
++ if (dev->nShortOpCaches > 0) {
++ yaffs_ChunkCache *cache;
++ /* If we can't find the data in the cache, then load the cache */
++ cache = yaffs_FindChunkCache(in, chunk);
++
++ if (!cache
++ && yaffs_CheckSpaceForAllocation(in->
++ myDev)) {
++ cache = yaffs_GrabChunkCache(in->myDev);
++ cache->object = in;
++ cache->chunkId = chunk;
++ cache->dirty = 0;
++ cache->locked = 0;
++ yaffs_ReadChunkDataFromObject(in, chunk,
++ cache->
++ data);
++ }
++ else if(cache &&
++ !cache->dirty &&
++ !yaffs_CheckSpaceForAllocation(in->myDev)){
++ /* Drop the cache if it was a read cache item and
++ * no space check has been made for it.
++ */
++ cache = NULL;
++ }
++
++ if (cache) {
++ yaffs_UseChunkCache(dev, cache, 1);
++ cache->locked = 1;
++#ifdef CONFIG_YAFFS_WINCE
++ yfsd_UnlockYAFFS(TRUE);
++#endif
++
++ memcpy(&cache->data[start], buffer,
++ nToCopy);
++
++#ifdef CONFIG_YAFFS_WINCE
++ yfsd_LockYAFFS(TRUE);
++#endif
++ cache->locked = 0;
++ cache->nBytes = nToWriteBack;
++
++ if (writeThrough) {
++ chunkWritten =
++ yaffs_WriteChunkDataToObject
++ (cache->object,
++ cache->chunkId,
++ cache->data, cache->nBytes,
++ 1);
++ cache->dirty = 0;
++ }
++
++ } else {
++ chunkWritten = -1; /* fail the write */
++ }
++ } else {
++ /* An incomplete start or end chunk (or maybe both start and end chunk)
++ * Read into the local buffer then copy, then copy over and write back.
++ */
++
++ __u8 *localBuffer =
++ yaffs_GetTempBuffer(dev, __LINE__);
++
++ yaffs_ReadChunkDataFromObject(in, chunk,
++ localBuffer);
++
++#ifdef CONFIG_YAFFS_WINCE
++ yfsd_UnlockYAFFS(TRUE);
++#endif
++
++ memcpy(&localBuffer[start], buffer, nToCopy);
++
++#ifdef CONFIG_YAFFS_WINCE
++ yfsd_LockYAFFS(TRUE);
++#endif
++ chunkWritten =
++ yaffs_WriteChunkDataToObject(in, chunk,
++ localBuffer,
++ nToWriteBack,
++ 0);
++
++ yaffs_ReleaseTempBuffer(dev, localBuffer,
++ __LINE__);
++
++ }
++
++ } else {
++
++#ifdef CONFIG_YAFFS_WINCE
++ /* Under WinCE can't do direct transfer. Need to use a local buffer.
++ * This is because we otherwise screw up WinCE's memory mapper
++ */
++ __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
++#ifdef CONFIG_YAFFS_WINCE
++ yfsd_UnlockYAFFS(TRUE);
++#endif
++ memcpy(localBuffer, buffer, dev->nDataBytesPerChunk);
++#ifdef CONFIG_YAFFS_WINCE
++ yfsd_LockYAFFS(TRUE);
++#endif
++ chunkWritten =
++ yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
++ dev->nDataBytesPerChunk,
++ 0);
++ yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
++#else
++ /* A full chunk. Write directly from the supplied buffer. */
++ chunkWritten =
++ yaffs_WriteChunkDataToObject(in, chunk, buffer,
++ dev->nDataBytesPerChunk,
++ 0);
++#endif
++ /* Since we've overwritten the cached data, we better invalidate it. */
++ yaffs_InvalidateChunkCache(in, chunk);
++ }
++
++ if (chunkWritten >= 0) {
++ n -= nToCopy;
++ offset += nToCopy;
++ buffer += nToCopy;
++ nDone += nToCopy;
++ }
++
++ }
++
++ /* Update file object */
++
++ if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
++ in->variant.fileVariant.fileSize = (startOfWrite + nDone);
++ }
++
++ in->dirty = 1;
++
++ return nDone;
++}
++
++
++/* ---------------------- File resizing stuff ------------------ */
++
++static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
++{
++
++ yaffs_Device *dev = in->myDev;
++ int oldFileSize = in->variant.fileVariant.fileSize;
++
++ int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
++
++ int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
++ dev->nDataBytesPerChunk;
++ int i;
++ int chunkId;
++
++ /* Delete backwards so that we don't end up with holes if
++ * power is lost part-way through the operation.
++ */
++ for (i = lastDel; i >= startDel; i--) {
++ /* NB this could be optimised somewhat,
++ * eg. could retrieve the tags and write them without
++ * using yaffs_DeleteChunk
++ */
++
++ chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
++ if (chunkId > 0) {
++ if (chunkId <
++ (dev->internalStartBlock * dev->nChunksPerBlock)
++ || chunkId >=
++ ((dev->internalEndBlock +
++ 1) * dev->nChunksPerBlock)) {
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR("Found daft chunkId %d for %d" TENDSTR),
++ chunkId, i));
++ } else {
++ in->nDataChunks--;
++ yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
++ }
++ }
++ }
++
++}
++
++int yaffs_ResizeFile(yaffs_Object * in, loff_t newSize)
++{
++
++ int oldFileSize = in->variant.fileVariant.fileSize;
++ int newSizeOfPartialChunk;
++ int newFullChunks;
++
++ yaffs_Device *dev = in->myDev;
++
++ yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
++
++ yaffs_FlushFilesChunkCache(in);
++ yaffs_InvalidateWholeChunkCache(in);
++
++ yaffs_CheckGarbageCollection(dev);
++
++ if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
++ return yaffs_GetFileSize(in);
++ }
++
++ if (newSize == oldFileSize) {
++ return oldFileSize;
++ }
++
++ if (newSize < oldFileSize) {
++
++ yaffs_PruneResizedChunks(in, newSize);
++
++ if (newSizeOfPartialChunk != 0) {
++ int lastChunk = 1 + newFullChunks;
++
++ __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
++
++ /* Got to read and rewrite the last chunk with its new size and zero pad */
++ yaffs_ReadChunkDataFromObject(in, lastChunk,
++ localBuffer);
++
++ memset(localBuffer + newSizeOfPartialChunk, 0,
++ dev->nDataBytesPerChunk - newSizeOfPartialChunk);
++
++ yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
++ newSizeOfPartialChunk, 1);
++
++ yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
++ }
++
++ in->variant.fileVariant.fileSize = newSize;
++
++ yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
++ }
++ /* Write a new object header.
++ * show we've shrunk the file, if need be
++ * Do this only if the file is not in the deleted directories.
++ */
++ if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
++ in->parent->objectId != YAFFS_OBJECTID_DELETED) {
++ yaffs_UpdateObjectHeader(in, NULL, 0,
++ (newSize < oldFileSize) ? 1 : 0, 0);
++ }
++
++ return newSize;
++}
++
++loff_t yaffs_GetFileSize(yaffs_Object * obj)
++{
++ obj = yaffs_GetEquivalentObject(obj);
++
++ switch (obj->variantType) {
++ case YAFFS_OBJECT_TYPE_FILE:
++ return obj->variant.fileVariant.fileSize;
++ case YAFFS_OBJECT_TYPE_SYMLINK:
++ return yaffs_strlen(obj->variant.symLinkVariant.alias);
++ default:
++ return 0;
++ }
++}
++
++
++
++int yaffs_FlushFile(yaffs_Object * in, int updateTime)
++{
++ int retVal;
++ if (in->dirty) {
++ yaffs_FlushFilesChunkCache(in);
++ if (updateTime) {
++#ifdef CONFIG_YAFFS_WINCE
++ yfsd_WinFileTimeNow(in->win_mtime);
++#else
++
++ in->yst_mtime = Y_CURRENT_TIME;
++
++#endif
++ }
++
++ retVal =
++ (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
++ 0) ? YAFFS_OK : YAFFS_FAIL;
++ } else {
++ retVal = YAFFS_OK;
++ }
++
++ return retVal;
++
++}
++
++static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
++{
++
++ /* First off, invalidate the file's data in the cache, without flushing. */
++ yaffs_InvalidateWholeChunkCache(in);
++
++ if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
++ /* Move to the unlinked directory so we have a record that it was deleted. */
++ yaffs_ChangeObjectName(in, in->myDev->deletedDir, NULL, 0, 0);
++
++ }
++
++ yaffs_RemoveObjectFromDirectory(in);
++ yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
++ in->chunkId = -1;
++
++ yaffs_FreeObject(in);
++ return YAFFS_OK;
++
++}
++
++/* yaffs_DeleteFile 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_UnlinkFile(yaffs_Object * in)
++{
++
++ int retVal;
++ int immediateDeletion = 0;
++
++ if (1) {
++#ifdef __KERNEL__
++ if (!in->myInode) {
++ immediateDeletion = 1;
++
++ }
++#else
++ if (in->inUse <= 0) {
++ immediateDeletion = 1;
++
++ }
++#endif
++ if (immediateDeletion) {
++ retVal =
++ yaffs_ChangeObjectName(in, in->myDev->deletedDir,
++ NULL, 0, 0);
++ T(YAFFS_TRACE_TRACING,
++ (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
++ in->objectId));
++ in->deleted = 1;
++ in->myDev->nDeletedFiles++;
++ if (0 && in->myDev->isYaffs2) {
++ yaffs_ResizeFile(in, 0);
++ }
++ yaffs_SoftDeleteFile(in);
++ } else {
++ retVal =
++ yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
++ NULL, 0, 0);
++ }
++
++ }
++ return retVal;
++}
++
++int yaffs_DeleteFile(yaffs_Object * in)
++{
++ int retVal = YAFFS_OK;
++
++ if (in->nDataChunks > 0) {
++ /* Use soft deletion if there is data in the file */
++ if (!in->unlinked) {
++ retVal = yaffs_UnlinkFile(in);
++ }
++ if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
++ in->deleted = 1;
++ in->myDev->nDeletedFiles++;
++ yaffs_SoftDeleteFile(in);
++ }
++ return in->deleted ? YAFFS_OK : YAFFS_FAIL;
++ } else {
++ /* The file has no data chunks so we toss it immediately */
++ yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
++ in->variant.fileVariant.top = NULL;
++ yaffs_DoGenericObjectDeletion(in);
++
++ return YAFFS_OK;
++ }
++}
++
++static int yaffs_DeleteDirectory(yaffs_Object * in)
++{
++ /* First check that the directory is empty. */
++ if (list_empty(&in->variant.directoryVariant.children)) {
++ return yaffs_DoGenericObjectDeletion(in);
++ }
++
++ return YAFFS_FAIL;
++
++}
++
++static int yaffs_DeleteSymLink(yaffs_Object * in)
++{
++ YFREE(in->variant.symLinkVariant.alias);
++
++ return yaffs_DoGenericObjectDeletion(in);
++}
++
++static int yaffs_DeleteHardLink(yaffs_Object * in)
++{
++ /* remove this hardlink from the list assocaited with the equivalent
++ * object
++ */
++ list_del(&in->hardLinks);
++ return yaffs_DoGenericObjectDeletion(in);
++}
++
++static void yaffs_DestroyObject(yaffs_Object * obj)
++{
++ switch (obj->variantType) {
++ case YAFFS_OBJECT_TYPE_FILE:
++ yaffs_DeleteFile(obj);
++ break;
++ case YAFFS_OBJECT_TYPE_DIRECTORY:
++ yaffs_DeleteDirectory(obj);
++ break;
++ case YAFFS_OBJECT_TYPE_SYMLINK:
++ yaffs_DeleteSymLink(obj);
++ break;
++ case YAFFS_OBJECT_TYPE_HARDLINK:
++ yaffs_DeleteHardLink(obj);
++ break;
++ case YAFFS_OBJECT_TYPE_SPECIAL:
++ yaffs_DoGenericObjectDeletion(obj);
++ break;
++ case YAFFS_OBJECT_TYPE_UNKNOWN:
++ break; /* should not happen. */
++ }
++}
++
++static int yaffs_UnlinkWorker(yaffs_Object * obj)
++{
++
++ if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
++ return yaffs_DeleteHardLink(obj);
++ } else if (!list_empty(&obj->hardLinks)) {
++ /* 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
++ * - Unhook it from its parent directory (so that the rename can work)
++ * - Rename the object to the hardlink's name.
++ * - Delete the hardlink
++ */
++
++ yaffs_Object *hl;
++ int retVal;
++ YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
++
++ hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
++
++ list_del_init(&hl->hardLinks);
++ list_del_init(&hl->siblings);
++
++ yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
++
++ retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
++
++ if (retVal == YAFFS_OK) {
++ retVal = yaffs_DoGenericObjectDeletion(hl);
++ }
++ return retVal;
++
++ } else {
++ switch (obj->variantType) {
++ case YAFFS_OBJECT_TYPE_FILE:
++ return yaffs_UnlinkFile(obj);
++ break;
++ case YAFFS_OBJECT_TYPE_DIRECTORY:
++ return yaffs_DeleteDirectory(obj);
++ break;
++ case YAFFS_OBJECT_TYPE_SYMLINK:
++ return yaffs_DeleteSymLink(obj);
++ break;
++ case YAFFS_OBJECT_TYPE_SPECIAL:
++ return yaffs_DoGenericObjectDeletion(obj);
++ break;
++ case YAFFS_OBJECT_TYPE_HARDLINK:
++ case YAFFS_OBJECT_TYPE_UNKNOWN:
++ default:
++ return YAFFS_FAIL;
++ }
++ }
++}
++
++
++static int yaffs_UnlinkObject( yaffs_Object *obj)
++{
++
++ if (obj && obj->unlinkAllowed) {
++ return yaffs_UnlinkWorker(obj);
++ }
++
++ return YAFFS_FAIL;
++
++}
++int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
++{
++ yaffs_Object *obj;
++
++ obj = yaffs_FindObjectByName(dir, name);
++ return yaffs_UnlinkObject(obj);
++}
++
++/*----------------------- Initialisation Scanning ---------------------- */
++
++static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
++ int backwardScanning)
++{
++ yaffs_Object *obj;
++
++ if (!backwardScanning) {
++ /* Handle YAFFS1 forward scanning case
++ * For YAFFS1 we always do the deletion
++ */
++
++ } else {
++ /* Handle YAFFS2 case (backward scanning)
++ * If the shadowed object exists then ignore.
++ */
++ if (yaffs_FindObjectByNumber(dev, objId)) {
++ 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_FindOrCreateObjectByNumber(dev, objId,
++ YAFFS_OBJECT_TYPE_FILE);
++ yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
++ obj->variant.fileVariant.shrinkSize = 0;
++ obj->valid = 1; /* So that we don't read any other info for this file */
++
++}
++
++typedef struct {
++ int seq;
++ int block;
++} yaffs_BlockIndex;
++
++
++static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
++{
++ yaffs_Object *hl;
++ yaffs_Object *in;
++
++ while (hardList) {
++ hl = hardList;
++ hardList = (yaffs_Object *) (hardList->hardLinks.next);
++
++ in = yaffs_FindObjectByNumber(dev,
++ hl->variant.hardLinkVariant.
++ equivalentObjectId);
++
++ if (in) {
++ /* Add the hardlink pointers */
++ hl->variant.hardLinkVariant.equivalentObject = in;
++ list_add(&hl->hardLinks, &in->hardLinks);
++ } else {
++ /* Todo Need to report/handle this better.
++ * Got a problem... hardlink to a non-existant object
++ */
++ hl->variant.hardLinkVariant.equivalentObject = NULL;
++ INIT_LIST_HEAD(&hl->hardLinks);
++
++ }
++
++ }
++
++}
++
++
++
++
++
++static int ybicmp(const void *a, const void *b){
++ register int aseq = ((yaffs_BlockIndex *)a)->seq;
++ register int bseq = ((yaffs_BlockIndex *)b)->seq;
++ register int ablock = ((yaffs_BlockIndex *)a)->block;
++ register int bblock = ((yaffs_BlockIndex *)b)->block;
++ if( aseq == bseq )
++ return ablock - bblock;
++ else
++ return aseq - bseq;
++
++}
++
++static int yaffs_Scan(yaffs_Device * dev)
++{
++ yaffs_ExtendedTags tags;
++ int blk;
++ int blockIterator;
++ int startIterator;
++ int endIterator;
++ int nBlocksToScan = 0;
++ int result;
++
++ int chunk;
++ int c;
++ int deleted;
++ yaffs_BlockState state;
++ yaffs_Object *hardList = NULL;
++ yaffs_Object *hl;
++ yaffs_BlockInfo *bi;
++ int sequenceNumber;
++ yaffs_ObjectHeader *oh;
++ yaffs_Object *in;
++ yaffs_Object *parent;
++ int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
++
++ __u8 *chunkData;
++
++ yaffs_BlockIndex *blockIndex = NULL;
++
++ if (dev->isYaffs2) {
++ T(YAFFS_TRACE_SCAN,
++ (TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR)));
++ return YAFFS_FAIL;
++ }
++
++ //TODO Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format.
++
++ T(YAFFS_TRACE_SCAN,
++ (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
++ dev->internalStartBlock, dev->internalEndBlock));
++
++ chunkData = yaffs_GetTempBuffer(dev, __LINE__);
++
++ dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
++
++ if (dev->isYaffs2) {
++ blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
++ }
++
++ /* Scan all the blocks to determine their state */
++ for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
++ bi = yaffs_GetBlockInfo(dev, blk);
++ yaffs_ClearChunkBits(dev, blk);
++ bi->pagesInUse = 0;
++ bi->softDeletions = 0;
++
++ yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
++
++ bi->blockState = state;
++ bi->sequenceNumber = sequenceNumber;
++
++ T(YAFFS_TRACE_SCAN_DEBUG,
++ (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
++ state, sequenceNumber));
++
++ if (state == YAFFS_BLOCK_STATE_DEAD) {
++ T(YAFFS_TRACE_BAD_BLOCKS,
++ (TSTR("block %d is bad" TENDSTR), blk));
++ } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
++ T(YAFFS_TRACE_SCAN_DEBUG,
++ (TSTR("Block empty " TENDSTR)));
++ dev->nErasedBlocks++;
++ dev->nFreeChunks += dev->nChunksPerBlock;
++ } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
++
++ /* Determine the highest sequence number */
++ if (dev->isYaffs2 &&
++ sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
++ sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
++
++ blockIndex[nBlocksToScan].seq = sequenceNumber;
++ blockIndex[nBlocksToScan].block = blk;
++
++ nBlocksToScan++;
++
++ if (sequenceNumber >= dev->sequenceNumber) {
++ dev->sequenceNumber = sequenceNumber;
++ }
++ } else if (dev->isYaffs2) {
++ /* TODO: Nasty sequence number! */
++ T(YAFFS_TRACE_SCAN,
++ (TSTR
++ ("Block scanning block %d has bad sequence number %d"
++ TENDSTR), blk, sequenceNumber));
++
++ }
++ }
++ }
++
++ /* Sort the blocks
++ * Dungy old bubble sort for now...
++ */
++ if (dev->isYaffs2) {
++ yaffs_BlockIndex temp;
++ int i;
++ int j;
++
++ for (i = 0; i < nBlocksToScan; i++)
++ for (j = i + 1; j < nBlocksToScan; j++)
++ if (blockIndex[i].seq > blockIndex[j].seq) {
++ temp = blockIndex[j];
++ blockIndex[j] = blockIndex[i];
++ blockIndex[i] = temp;
++ }
++ }
++
++ /* Now scan the blocks looking at the data. */
++ if (dev->isYaffs2) {
++ startIterator = 0;
++ endIterator = nBlocksToScan - 1;
++ T(YAFFS_TRACE_SCAN_DEBUG,
++ (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
++ } else {
++ startIterator = dev->internalStartBlock;
++ endIterator = dev->internalEndBlock;
++ }
++
++ /* For each block.... */
++ for (blockIterator = startIterator; blockIterator <= endIterator;
++ blockIterator++) {
++
++ if (dev->isYaffs2) {
++ /* get the block to scan in the correct order */
++ blk = blockIndex[blockIterator].block;
++ } else {
++ blk = blockIterator;
++ }
++
++ bi = yaffs_GetBlockInfo(dev, blk);
++ state = bi->blockState;
++
++ deleted = 0;
++
++ /* For each chunk in each block that needs scanning....*/
++ for (c = 0; c < dev->nChunksPerBlock &&
++ state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
++ /* Read the tags and decide what to do */
++ chunk = blk * dev->nChunksPerBlock + c;
++
++ result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
++ &tags);
++
++ /* Let's have a good look at this chunk... */
++
++ if (!dev->isYaffs2 && tags.chunkDeleted) {
++ /* YAFFS1 only...
++ * A deleted chunk
++ */
++ deleted++;
++ dev->nFreeChunks++;
++ /*T((" %d %d deleted\n",blk,c)); */
++ } else if (!tags.chunkUsed) {
++ /* 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->nErasedBlocks++;
++ } else {
++ /* this is the block being allocated from */
++ T(YAFFS_TRACE_SCAN,
++ (TSTR
++ (" Allocating from %d %d" TENDSTR),
++ blk, c));
++ state = YAFFS_BLOCK_STATE_ALLOCATING;
++ dev->allocationBlock = blk;
++ dev->allocationPage = c;
++ dev->allocationBlockFinder = blk;
++ /* Set it to here to encourage the allocator to go forth from here. */
++
++ /* Yaffs2 sanity check:
++ * This should be the one with the highest sequence number
++ */
++ if (dev->isYaffs2
++ && (dev->sequenceNumber !=
++ bi->sequenceNumber)) {
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR
++ ("yaffs: Allocation block %d was not highest sequence id:"
++ " block seq = %d, dev seq = %d"
++ TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
++ }
++ }
++
++ dev->nFreeChunks += (dev->nChunksPerBlock - c);
++ } else if (tags.chunkId > 0) {
++ /* chunkId > 0 so it is a data chunk... */
++ unsigned int endpos;
++
++ yaffs_SetChunkBit(dev, blk, c);
++ bi->pagesInUse++;
++
++ in = yaffs_FindOrCreateObjectByNumber(dev,
++ tags.
++ objectId,
++ YAFFS_OBJECT_TYPE_FILE);
++ /* PutChunkIntoFile checks for a clash (two data chunks with
++ * the same chunkId).
++ */
++ yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,
++ 1);
++ endpos =
++ (tags.chunkId - 1) * dev->nDataBytesPerChunk +
++ tags.byteCount;
++ if (in->variantType == YAFFS_OBJECT_TYPE_FILE
++ && in->variant.fileVariant.scannedFileSize <
++ endpos) {
++ in->variant.fileVariant.
++ scannedFileSize = endpos;
++ if (!dev->useHeaderFileSize) {
++ in->variant.fileVariant.
++ fileSize =
++ in->variant.fileVariant.
++ scannedFileSize;
++ }
++
++ }
++ /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
++ } else {
++ /* chunkId == 0, so it is an ObjectHeader.
++ * Thus, we read in the object header and make the object
++ */
++ yaffs_SetChunkBit(dev, blk, c);
++ bi->pagesInUse++;
++
++ result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
++ chunkData,
++ NULL);
++
++ oh = (yaffs_ObjectHeader *) chunkData;
++
++ in = yaffs_FindObjectByNumber(dev,
++ tags.objectId);
++ if (in && in->variantType != oh->type) {
++ /* This should not happen, but somehow
++ * Wev'e ended up with an objectId that has been reused but not yet
++ * deleted, and worse still it has changed type. Delete the old object.
++ */
++
++ yaffs_DestroyObject(in);
++
++ in = 0;
++ }
++
++ in = yaffs_FindOrCreateObjectByNumber(dev,
++ tags.
++ objectId,
++ oh->type);
++
++ if (oh->shadowsObject > 0) {
++ yaffs_HandleShadowedObject(dev,
++ oh->
++ shadowsObject,
++ 0);
++ }
++
++ if (in->valid) {
++ /* We have already filled this one. We have a duplicate and need to resolve it. */
++
++ unsigned existingSerial = in->serial;
++ unsigned newSerial = tags.serialNumber;
++
++ if (dev->isYaffs2 ||
++ ((existingSerial + 1) & 3) ==
++ newSerial) {
++ /* Use new one - destroy the exisiting one */
++ yaffs_DeleteChunk(dev,
++ in->chunkId,
++ 1, __LINE__);
++ in->valid = 0;
++ } else {
++ /* Use existing - destroy this one. */
++ yaffs_DeleteChunk(dev, chunk, 1,
++ __LINE__);
++ }
++ }
++
++ if (!in->valid &&
++ (tags.objectId == YAFFS_OBJECTID_ROOT ||
++ tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
++ /* We only load some info, don't fiddle with directory structure */
++ in->valid = 1;
++ in->variantType = oh->type;
++
++ in->yst_mode = oh->yst_mode;
++#ifdef CONFIG_YAFFS_WINCE
++ in->win_atime[0] = oh->win_atime[0];
++ in->win_ctime[0] = oh->win_ctime[0];
++ in->win_mtime[0] = oh->win_mtime[0];
++ in->win_atime[1] = oh->win_atime[1];
++ in->win_ctime[1] = oh->win_ctime[1];
++ in->win_mtime[1] = oh->win_mtime[1];
++#else
++ in->yst_uid = oh->yst_uid;
++ in->yst_gid = oh->yst_gid;
++ in->yst_atime = oh->yst_atime;
++ in->yst_mtime = oh->yst_mtime;
++ in->yst_ctime = oh->yst_ctime;
++ in->yst_rdev = oh->yst_rdev;
++#endif
++ in->chunkId = chunk;
++
++ } else if (!in->valid) {
++ /* we need to load this info */
++
++ in->valid = 1;
++ in->variantType = oh->type;
++
++ in->yst_mode = oh->yst_mode;
++#ifdef CONFIG_YAFFS_WINCE
++ in->win_atime[0] = oh->win_atime[0];
++ in->win_ctime[0] = oh->win_ctime[0];
++ in->win_mtime[0] = oh->win_mtime[0];
++ in->win_atime[1] = oh->win_atime[1];
++ in->win_ctime[1] = oh->win_ctime[1];
++ in->win_mtime[1] = oh->win_mtime[1];
++#else
++ in->yst_uid = oh->yst_uid;
++ in->yst_gid = oh->yst_gid;
++ in->yst_atime = oh->yst_atime;
++ in->yst_mtime = oh->yst_mtime;
++ in->yst_ctime = oh->yst_ctime;
++ in->yst_rdev = oh->yst_rdev;
++#endif
++ in->chunkId = chunk;
++
++ yaffs_SetObjectName(in, oh->name);
++ in->dirty = 0;
++
++ /* directory stuff...
++ * hook up to parent
++ */
++
++ parent =
++ yaffs_FindOrCreateObjectByNumber
++ (dev, oh->parentObjectId,
++ YAFFS_OBJECT_TYPE_DIRECTORY);
++ if (parent->variantType ==
++ YAFFS_OBJECT_TYPE_UNKNOWN) {
++ /* Set up as a directory */
++ parent->variantType =
++ YAFFS_OBJECT_TYPE_DIRECTORY;
++ INIT_LIST_HEAD(&parent->variant.
++ directoryVariant.
++ children);
++ } else if (parent->variantType !=
++ YAFFS_OBJECT_TYPE_DIRECTORY)
++ {
++ /* Hoosterman, another problem....
++ * We're trying to use a non-directory as a directory
++ */
++
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("yaffs tragedy: attempting to use non-directory as"
++ " a directory in scan. Put in lost+found."
++ TENDSTR)));
++ parent = dev->lostNFoundDir;
++ }
++
++ yaffs_AddObjectToDirectory(parent, in);
++
++ if (0 && (parent == dev->deletedDir ||
++ parent == dev->unlinkedDir)) {
++ in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
++ dev->nDeletedFiles++;
++ }
++ /* 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->variantType) {
++ case YAFFS_OBJECT_TYPE_UNKNOWN:
++ /* Todo got a problem */
++ break;
++ case YAFFS_OBJECT_TYPE_FILE:
++ if (dev->isYaffs2
++ && oh->isShrink) {
++ /* Prune back the shrunken chunks */
++ yaffs_PruneResizedChunks
++ (in, oh->fileSize);
++ /* Mark the block as having a shrinkHeader */
++ bi->hasShrinkHeader = 1;
++ }
++
++ if (dev->useHeaderFileSize)
++
++ in->variant.fileVariant.
++ fileSize =
++ oh->fileSize;
++
++ break;
++ case YAFFS_OBJECT_TYPE_HARDLINK:
++ in->variant.hardLinkVariant.
++ equivalentObjectId =
++ oh->equivalentObjectId;
++ in->hardLinks.next =
++ (struct list_head *)
++ hardList;
++ hardList = in;
++ break;
++ case YAFFS_OBJECT_TYPE_DIRECTORY:
++ /* Do nothing */
++ break;
++ case YAFFS_OBJECT_TYPE_SPECIAL:
++ /* Do nothing */
++ break;
++ case YAFFS_OBJECT_TYPE_SYMLINK:
++ in->variant.symLinkVariant.
++ alias =
++ yaffs_CloneString(oh->alias);
++ break;
++ }
++
++ if (parent == dev->deletedDir) {
++ yaffs_DestroyObject(in);
++ bi->hasShrinkHeader = 1;
++ }
++ }
++ }
++ }
++
++ if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
++ /* If we got this far while scanning, then the block is fully allocated.*/
++ state = YAFFS_BLOCK_STATE_FULL;
++ }
++
++ bi->blockState = state;
++
++ /* Now let's see if it was dirty */
++ if (bi->pagesInUse == 0 &&
++ !bi->hasShrinkHeader &&
++ bi->blockState == YAFFS_BLOCK_STATE_FULL) {
++ yaffs_BlockBecameDirty(dev, blk);
++ }
++
++ }
++
++ if (blockIndex) {
++ YFREE(blockIndex);
++ }
++
++
++ /* 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_HardlinkFixup(dev,hardList);
++
++ /* Handle the unlinked files. Since they were left in an unlinked state we should
++ * just delete them.
++ */
++ {
++ struct list_head *i;
++ struct list_head *n;
++
++ yaffs_Object *l;
++ /* Soft delete all the unlinked files */
++ list_for_each_safe(i, n,
++ &dev->unlinkedDir->variant.directoryVariant.
++ children) {
++ if (i) {
++ l = list_entry(i, yaffs_Object, siblings);
++ yaffs_DestroyObject(l);
++ }
++ }
++ }
++
++ yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
++
++ T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
++
++ return YAFFS_OK;
++}
++
++static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
++{
++ __u8 *chunkData;
++ yaffs_ObjectHeader *oh;
++ yaffs_Device *dev = in->myDev;
++ yaffs_ExtendedTags tags;
++ int result;
++
++#if 0
++ T(YAFFS_TRACE_SCAN,(TSTR("details for object %d %s loaded" TENDSTR),
++ in->objectId,
++ in->lazyLoaded ? "not yet" : "already"));
++#endif
++
++ if(in->lazyLoaded){
++ in->lazyLoaded = 0;
++ chunkData = yaffs_GetTempBuffer(dev, __LINE__);
++
++ result = yaffs_ReadChunkWithTagsFromNAND(dev,in->chunkId,chunkData,&tags);
++ oh = (yaffs_ObjectHeader *) chunkData;
++
++ in->yst_mode = oh->yst_mode;
++#ifdef CONFIG_YAFFS_WINCE
++ in->win_atime[0] = oh->win_atime[0];
++ in->win_ctime[0] = oh->win_ctime[0];
++ in->win_mtime[0] = oh->win_mtime[0];
++ in->win_atime[1] = oh->win_atime[1];
++ in->win_ctime[1] = oh->win_ctime[1];
++ in->win_mtime[1] = oh->win_mtime[1];
++#else
++ in->yst_uid = oh->yst_uid;
++ in->yst_gid = oh->yst_gid;
++ in->yst_atime = oh->yst_atime;
++ in->yst_mtime = oh->yst_mtime;
++ in->yst_ctime = oh->yst_ctime;
++ in->yst_rdev = oh->yst_rdev;
++
++#endif
++ yaffs_SetObjectName(in, oh->name);
++
++ if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
++ in->variant.symLinkVariant.alias =
++ yaffs_CloneString(oh->alias);
++
++ yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
++ }
++}
++
++static int yaffs_ScanBackwards(yaffs_Device * dev)
++{
++ yaffs_ExtendedTags tags;
++ int blk;
++ int blockIterator;
++ int startIterator;
++ int endIterator;
++ int nBlocksToScan = 0;
++
++ int chunk;
++ int result;
++ int c;
++ int deleted;
++ yaffs_BlockState state;
++ yaffs_Object *hardList = NULL;
++ yaffs_BlockInfo *bi;
++ int sequenceNumber;
++ yaffs_ObjectHeader *oh;
++ yaffs_Object *in;
++ yaffs_Object *parent;
++ int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
++ int itsUnlinked;
++ __u8 *chunkData;
++
++ int fileSize;
++ int isShrink;
++ int foundChunksInBlock;
++ int equivalentObjectId;
++
++
++ yaffs_BlockIndex *blockIndex = NULL;
++ int altBlockIndex = 0;
++
++ if (!dev->isYaffs2) {
++ T(YAFFS_TRACE_SCAN,
++ (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
++ return YAFFS_FAIL;
++ }
++
++ T(YAFFS_TRACE_SCAN,
++ (TSTR
++ ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
++ TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
++
++
++ dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
++
++ blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
++
++ if(!blockIndex) {
++ blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
++ altBlockIndex = 1;
++ }
++
++ if(!blockIndex) {
++ T(YAFFS_TRACE_SCAN,
++ (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
++ return YAFFS_FAIL;
++ }
++
++ chunkData = yaffs_GetTempBuffer(dev, __LINE__);
++
++ /* Scan all the blocks to determine their state */
++ for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
++ bi = yaffs_GetBlockInfo(dev, blk);
++ yaffs_ClearChunkBits(dev, blk);
++ bi->pagesInUse = 0;
++ bi->softDeletions = 0;
++
++ yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
++
++ bi->blockState = state;
++ bi->sequenceNumber = sequenceNumber;
++
++ if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
++ bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
++
++ T(YAFFS_TRACE_SCAN_DEBUG,
++ (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
++ state, sequenceNumber));
++
++
++ if(state == YAFFS_BLOCK_STATE_CHECKPOINT){
++ /* todo .. fix free space ? */
++
++ } else if (state == YAFFS_BLOCK_STATE_DEAD) {
++ T(YAFFS_TRACE_BAD_BLOCKS,
++ (TSTR("block %d is bad" TENDSTR), blk));
++ } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
++ T(YAFFS_TRACE_SCAN_DEBUG,
++ (TSTR("Block empty " TENDSTR)));
++ dev->nErasedBlocks++;
++ dev->nFreeChunks += dev->nChunksPerBlock;
++ } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
++
++ /* Determine the highest sequence number */
++ if (dev->isYaffs2 &&
++ sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
++ sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
++
++ blockIndex[nBlocksToScan].seq = sequenceNumber;
++ blockIndex[nBlocksToScan].block = blk;
++
++ nBlocksToScan++;
++
++ if (sequenceNumber >= dev->sequenceNumber) {
++ dev->sequenceNumber = sequenceNumber;
++ }
++ } else if (dev->isYaffs2) {
++ /* TODO: Nasty sequence number! */
++ T(YAFFS_TRACE_SCAN,
++ (TSTR
++ ("Block scanning block %d has bad sequence number %d"
++ TENDSTR), blk, sequenceNumber));
++
++ }
++ }
++ }
++
++ T(YAFFS_TRACE_SCAN,
++ (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
++
++
++
++ YYIELD();
++
++ /* Sort the blocks */
++#ifndef CONFIG_YAFFS_USE_OWN_SORT
++ {
++ /* Use qsort now. */
++ qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
++ }
++#else
++ {
++ /* Dungy old bubble sort... */
++
++ yaffs_BlockIndex temp;
++ int i;
++ int j;
++
++ for (i = 0; i < nBlocksToScan; i++)
++ for (j = i + 1; j < nBlocksToScan; j++)
++ if (blockIndex[i].seq > blockIndex[j].seq) {
++ temp = blockIndex[j];
++ blockIndex[j] = blockIndex[i];
++ blockIndex[i] = temp;
++ }
++ }
++#endif
++
++ YYIELD();
++
++ T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
++
++ /* Now scan the blocks looking at the data. */
++ startIterator = 0;
++ endIterator = nBlocksToScan - 1;
++ T(YAFFS_TRACE_SCAN_DEBUG,
++ (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
++
++ /* For each block.... backwards */
++ for (blockIterator = endIterator; blockIterator >= startIterator;
++ blockIterator--) {
++ /* Cooperative multitasking! This loop can run for so
++ long that watchdog timers expire. */
++ YYIELD();
++
++ /* get the block to scan in the correct order */
++ blk = blockIndex[blockIterator].block;
++
++ bi = yaffs_GetBlockInfo(dev, blk);
++ state = bi->blockState;
++
++ deleted = 0;
++
++ /* For each chunk in each block that needs scanning.... */
++ foundChunksInBlock = 0;
++ for (c = dev->nChunksPerBlock - 1; c >= 0 &&
++ (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
++ state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
++ /* Scan backwards...
++ * Read the tags and decide what to do
++ */
++ chunk = blk * dev->nChunksPerBlock + c;
++
++ result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
++ &tags);
++
++ /* Let's have a good look at this chunk... */
++
++ if (!tags.chunkUsed) {
++ /* 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(foundChunksInBlock)
++ {
++ /* This is a chunk that was skipped due to failing the erased check */
++
++ } else if (c == 0) {
++ /* We're looking at the first chunk in the block so the block is unused */
++ state = YAFFS_BLOCK_STATE_EMPTY;
++ dev->nErasedBlocks++;
++ } else {
++ if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
++ state == YAFFS_BLOCK_STATE_ALLOCATING) {
++ if(dev->sequenceNumber == bi->sequenceNumber) {
++ /* this is the block being allocated from */
++
++ T(YAFFS_TRACE_SCAN,
++ (TSTR
++ (" Allocating from %d %d"
++ TENDSTR), blk, c));
++
++ state = YAFFS_BLOCK_STATE_ALLOCATING;
++ dev->allocationBlock = blk;
++ dev->allocationPage = c;
++ dev->allocationBlockFinder = blk;
++ }
++ else {
++ /* This is a partially written block that is not
++ * the current allocation block. This block must have
++ * had a write failure, so set up for retirement.
++ */
++
++ bi->needsRetiring = 1;
++ bi->gcPrioritise = 1;
++
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR("Partially written block %d being set for retirement" TENDSTR),
++ blk));
++ }
++
++ }
++
++ }
++
++ dev->nFreeChunks++;
++
++ } else if (tags.chunkId > 0) {
++ /* chunkId > 0 so it is a data chunk... */
++ unsigned int endpos;
++ __u32 chunkBase =
++ (tags.chunkId - 1) * dev->nDataBytesPerChunk;
++
++ foundChunksInBlock = 1;
++
++
++ yaffs_SetChunkBit(dev, blk, c);
++ bi->pagesInUse++;
++
++ in = yaffs_FindOrCreateObjectByNumber(dev,
++ tags.
++ objectId,
++ YAFFS_OBJECT_TYPE_FILE);
++ if (in->variantType == YAFFS_OBJECT_TYPE_FILE
++ && chunkBase <
++ in->variant.fileVariant.shrinkSize) {
++ /* This has not been invalidated by a resize */
++ yaffs_PutChunkIntoFile(in, tags.chunkId,
++ chunk, -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 =
++ (tags.chunkId -
++ 1) * dev->nDataBytesPerChunk +
++ tags.byteCount;
++
++ if (!in->valid && /* have not got an object header yet */
++ in->variant.fileVariant.
++ scannedFileSize < endpos) {
++ in->variant.fileVariant.
++ scannedFileSize = endpos;
++ in->variant.fileVariant.
++ fileSize =
++ in->variant.fileVariant.
++ scannedFileSize;
++ }
++
++ } else {
++ /* This chunk has been invalidated by a resize, so delete */
++ yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
++
++ }
++ } else {
++ /* chunkId == 0, so it is an ObjectHeader.
++ * Thus, we read in the object header and make the object
++ */
++ foundChunksInBlock = 1;
++
++ yaffs_SetChunkBit(dev, blk, c);
++ bi->pagesInUse++;
++
++ oh = NULL;
++ in = NULL;
++
++ if (tags.extraHeaderInfoAvailable) {
++ in = yaffs_FindOrCreateObjectByNumber
++ (dev, tags.objectId,
++ tags.extraObjectType);
++ }
++
++ if (!in ||
++#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
++ !in->valid ||
++#endif
++ tags.extraShadows ||
++ (!in->valid &&
++ (tags.objectId == YAFFS_OBJECTID_ROOT ||
++ tags.objectId == 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_ReadChunkWithTagsFromNAND(dev,
++ chunk,
++ chunkData,
++ NULL);
++
++ oh = (yaffs_ObjectHeader *) chunkData;
++
++ if (!in)
++ in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
++
++ }
++
++ if (!in) {
++ /* TODO Hoosterman we have a problem! */
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("yaffs tragedy: Could not make object for object %d "
++ "at chunk %d during scan"
++ TENDSTR), tags.objectId, chunk));
++
++ }
++
++ 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->variantType == YAFFS_OBJECT_TYPE_FILE) &&
++ ((oh &&
++ oh-> type == YAFFS_OBJECT_TYPE_FILE)||
++ (tags.extraHeaderInfoAvailable &&
++ tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
++ ) {
++ __u32 thisSize =
++ (oh) ? oh->fileSize : tags.
++ extraFileLength;
++ __u32 parentObjectId =
++ (oh) ? oh->
++ parentObjectId : tags.
++ extraParentObjectId;
++ unsigned isShrink =
++ (oh) ? oh->isShrink : tags.
++ extraIsShrinkHeader;
++
++ /* If it is deleted (unlinked at start also means deleted)
++ * we treat the file size as being zeroed at this point.
++ */
++ if (parentObjectId ==
++ YAFFS_OBJECTID_DELETED
++ || parentObjectId ==
++ YAFFS_OBJECTID_UNLINKED) {
++ thisSize = 0;
++ isShrink = 1;
++ }
++
++ if (isShrink &&
++ in->variant.fileVariant.
++ shrinkSize > thisSize) {
++ in->variant.fileVariant.
++ shrinkSize =
++ thisSize;
++ }
++
++ if (isShrink) {
++ bi->hasShrinkHeader = 1;
++ }
++
++ }
++ /* Use existing - destroy this one. */
++ yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
++
++ }
++
++ if (!in->valid &&
++ (tags.objectId == YAFFS_OBJECTID_ROOT ||
++ tags.objectId ==
++ YAFFS_OBJECTID_LOSTNFOUND)) {
++ /* We only load some info, don't fiddle with directory structure */
++ in->valid = 1;
++
++ if(oh) {
++ in->variantType = oh->type;
++
++ in->yst_mode = oh->yst_mode;
++#ifdef CONFIG_YAFFS_WINCE
++ in->win_atime[0] = oh->win_atime[0];
++ in->win_ctime[0] = oh->win_ctime[0];
++ in->win_mtime[0] = oh->win_mtime[0];
++ in->win_atime[1] = oh->win_atime[1];
++ in->win_ctime[1] = oh->win_ctime[1];
++ in->win_mtime[1] = oh->win_mtime[1];
++#else
++ in->yst_uid = oh->yst_uid;
++ in->yst_gid = oh->yst_gid;
++ in->yst_atime = oh->yst_atime;
++ in->yst_mtime = oh->yst_mtime;
++ in->yst_ctime = oh->yst_ctime;
++ in->yst_rdev = oh->yst_rdev;
++
++#endif
++ } else {
++ in->variantType = tags.extraObjectType;
++ in->lazyLoaded = 1;
++ }
++
++ in->chunkId = chunk;
++
++ } else if (!in->valid) {
++ /* we need to load this info */
++
++ in->valid = 1;
++ in->chunkId = chunk;
++
++ if(oh) {
++ in->variantType = oh->type;
++
++ in->yst_mode = oh->yst_mode;
++#ifdef CONFIG_YAFFS_WINCE
++ in->win_atime[0] = oh->win_atime[0];
++ in->win_ctime[0] = oh->win_ctime[0];
++ in->win_mtime[0] = oh->win_mtime[0];
++ in->win_atime[1] = oh->win_atime[1];
++ in->win_ctime[1] = oh->win_ctime[1];
++ in->win_mtime[1] = oh->win_mtime[1];
++#else
++ in->yst_uid = oh->yst_uid;
++ in->yst_gid = oh->yst_gid;
++ in->yst_atime = oh->yst_atime;
++ in->yst_mtime = oh->yst_mtime;
++ in->yst_ctime = oh->yst_ctime;
++ in->yst_rdev = oh->yst_rdev;
++#endif
++
++ if (oh->shadowsObject > 0)
++ yaffs_HandleShadowedObject(dev,
++ oh->
++ shadowsObject,
++ 1);
++
++
++ yaffs_SetObjectName(in, oh->name);
++ parent =
++ yaffs_FindOrCreateObjectByNumber
++ (dev, oh->parentObjectId,
++ YAFFS_OBJECT_TYPE_DIRECTORY);
++
++ fileSize = oh->fileSize;
++ isShrink = oh->isShrink;
++ equivalentObjectId = oh->equivalentObjectId;
++
++ }
++ else {
++ in->variantType = tags.extraObjectType;
++ parent =
++ yaffs_FindOrCreateObjectByNumber
++ (dev, tags.extraParentObjectId,
++ YAFFS_OBJECT_TYPE_DIRECTORY);
++ fileSize = tags.extraFileLength;
++ isShrink = tags.extraIsShrinkHeader;
++ equivalentObjectId = tags.extraEquivalentObjectId;
++ in->lazyLoaded = 1;
++
++ }
++ in->dirty = 0;
++
++ /* directory stuff...
++ * hook up to parent
++ */
++
++ if (parent->variantType ==
++ YAFFS_OBJECT_TYPE_UNKNOWN) {
++ /* Set up as a directory */
++ parent->variantType =
++ YAFFS_OBJECT_TYPE_DIRECTORY;
++ INIT_LIST_HEAD(&parent->variant.
++ directoryVariant.
++ children);
++ } else if (parent->variantType !=
++ YAFFS_OBJECT_TYPE_DIRECTORY)
++ {
++ /* Hoosterman, another problem....
++ * We're trying to use a non-directory as a directory
++ */
++
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("yaffs tragedy: attempting to use non-directory as"
++ " a directory in scan. Put in lost+found."
++ TENDSTR)));
++ parent = dev->lostNFoundDir;
++ }
++
++ yaffs_AddObjectToDirectory(parent, in);
++
++ itsUnlinked = (parent == dev->deletedDir) ||
++ (parent == dev->unlinkedDir);
++
++ if (isShrink) {
++ /* Mark the block as having a shrinkHeader */
++ bi->hasShrinkHeader = 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->variantType) {
++ case YAFFS_OBJECT_TYPE_UNKNOWN:
++ /* Todo got a problem */
++ break;
++ case YAFFS_OBJECT_TYPE_FILE:
++
++ if (in->variant.fileVariant.
++ scannedFileSize < fileSize) {
++ /* This covers the case where the file size is greater
++ * than where the data is
++ * This will happen if the file is resized to be larger
++ * than its current data extents.
++ */
++ in->variant.fileVariant.fileSize = fileSize;
++ in->variant.fileVariant.scannedFileSize =
++ in->variant.fileVariant.fileSize;
++ }
++
++ if (isShrink &&
++ in->variant.fileVariant.shrinkSize > fileSize) {
++ in->variant.fileVariant.shrinkSize = fileSize;
++ }
++
++ break;
++ case YAFFS_OBJECT_TYPE_HARDLINK:
++ if(!itsUnlinked) {
++ in->variant.hardLinkVariant.equivalentObjectId =
++ equivalentObjectId;
++ in->hardLinks.next =
++ (struct list_head *) hardList;
++ hardList = in;
++ }
++ break;
++ case YAFFS_OBJECT_TYPE_DIRECTORY:
++ /* Do nothing */
++ break;
++ case YAFFS_OBJECT_TYPE_SPECIAL:
++ /* Do nothing */
++ break;
++ case YAFFS_OBJECT_TYPE_SYMLINK:
++ if(oh)
++ in->variant.symLinkVariant.alias =
++ yaffs_CloneString(oh->
++ alias);
++ break;
++ }
++
++ }
++ }
++ }
++
++ if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
++ /* If we got this far while scanning, then the block is fully allocated. */
++ state = YAFFS_BLOCK_STATE_FULL;
++ }
++
++ bi->blockState = state;
++
++ /* Now let's see if it was dirty */
++ if (bi->pagesInUse == 0 &&
++ !bi->hasShrinkHeader &&
++ bi->blockState == YAFFS_BLOCK_STATE_FULL) {
++ yaffs_BlockBecameDirty(dev, blk);
++ }
++
++ }
++
++ if (altBlockIndex)
++ YFREE_ALT(blockIndex);
++ else
++ YFREE(blockIndex);
++
++ /* 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_HardlinkFixup(dev,hardList);
++
++
++ /*
++ * Sort out state of unlinked and deleted objects.
++ */
++ {
++ struct list_head *i;
++ struct list_head *n;
++
++ yaffs_Object *l;
++
++ /* Soft delete all the unlinked files */
++ list_for_each_safe(i, n,
++ &dev->unlinkedDir->variant.directoryVariant.
++ children) {
++ if (i) {
++ l = list_entry(i, yaffs_Object, siblings);
++ yaffs_DestroyObject(l);
++ }
++ }
++
++ /* Soft delete all the deletedDir files */
++ list_for_each_safe(i, n,
++ &dev->deletedDir->variant.directoryVariant.
++ children) {
++ if (i) {
++ l = list_entry(i, yaffs_Object, siblings);
++ yaffs_DestroyObject(l);
++
++ }
++ }
++ }
++
++ yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
++
++ T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
++
++ return YAFFS_OK;
++}
++
++/*------------------------------ Directory Functions ----------------------------- */
++
++static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
++{
++ yaffs_Device *dev = obj->myDev;
++
++ if(dev && dev->removeObjectCallback)
++ dev->removeObjectCallback(obj);
++
++ list_del_init(&obj->siblings);
++ obj->parent = NULL;
++}
++
++
++static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
++ yaffs_Object * obj)
++{
++
++ if (!directory) {
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR
++ ("tragedy: Trying to add an object to a null pointer directory"
++ TENDSTR)));
++ YBUG();
++ }
++ if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR
++ ("tragedy: Trying to add an object to a non-directory"
++ TENDSTR)));
++ YBUG();
++ }
++
++ if (obj->siblings.prev == NULL) {
++ /* Not initialised */
++ INIT_LIST_HEAD(&obj->siblings);
++
++ } else if (!list_empty(&obj->siblings)) {
++ /* If it is holed up somewhere else, un hook it */
++ yaffs_RemoveObjectFromDirectory(obj);
++ }
++ /* Now add it */
++ list_add(&obj->siblings, &directory->variant.directoryVariant.children);
++ obj->parent = directory;
++
++ if (directory == obj->myDev->unlinkedDir
++ || directory == obj->myDev->deletedDir) {
++ obj->unlinked = 1;
++ obj->myDev->nUnlinkedFiles++;
++ obj->renameAllowed = 0;
++ }
++}
++
++yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
++ const YCHAR * name)
++{
++ int sum;
++
++ struct list_head *i;
++ YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
++
++ yaffs_Object *l;
++
++ if (!name) {
++ return NULL;
++ }
++
++ if (!directory) {
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR
++ ("tragedy: yaffs_FindObjectByName: null pointer directory"
++ TENDSTR)));
++ YBUG();
++ }
++ if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR
++ ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
++ YBUG();
++ }
++
++ sum = yaffs_CalcNameSum(name);
++
++ list_for_each(i, &directory->variant.directoryVariant.children) {
++ if (i) {
++ l = list_entry(i, yaffs_Object, siblings);
++
++ yaffs_CheckObjectDetailsLoaded(l);
++
++ /* Special case for lost-n-found */
++ if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
++ if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
++ return l;
++ }
++ } else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
++ {
++ /* LostnFound cunk called Objxxx
++ * Do a real check
++ */
++ yaffs_GetObjectName(l, buffer,
++ YAFFS_MAX_NAME_LENGTH);
++ if (yaffs_strcmp(name, buffer) == 0) {
++ return l;
++ }
++
++ }
++ }
++ }
++
++ return NULL;
++}
++
++
++#if 0
++int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
++ int (*fn) (yaffs_Object *))
++{
++ struct list_head *i;
++ yaffs_Object *l;
++
++ if (!theDir) {
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR
++ ("tragedy: yaffs_FindObjectByName: null pointer directory"
++ TENDSTR)));
++ YBUG();
++ }
++ if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR
++ ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
++ YBUG();
++ }
++
++ list_for_each(i, &theDir->variant.directoryVariant.children) {
++ if (i) {
++ l = list_entry(i, yaffs_Object, siblings);
++ if (l && !fn(l)) {
++ return YAFFS_FAIL;
++ }
++ }
++ }
++
++ return YAFFS_OK;
++
++}
++#endif
++
++/* GetEquivalentObject dereferences any hard links to get to the
++ * actual object.
++ */
++
++yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
++{
++ if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
++ /* We want the object id of the equivalent object, not this one */
++ obj = obj->variant.hardLinkVariant.equivalentObject;
++ }
++ return obj;
++
++}
++
++int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
++{
++ memset(name, 0, buffSize * sizeof(YCHAR));
++
++ yaffs_CheckObjectDetailsLoaded(obj);
++
++ if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
++ yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
++ } else if (obj->chunkId <= 0) {
++ YCHAR locName[20];
++ /* make up a name */
++ yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
++ obj->objectId);
++ yaffs_strncpy(name, locName, buffSize - 1);
++
++ }
++#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
++ else if (obj->shortName[0]) {
++ yaffs_strcpy(name, obj->shortName);
++ }
++#endif
++ else {
++ int result;
++ __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
++
++ yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
++
++ memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
++
++ if (obj->chunkId >= 0) {
++ result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
++ obj->chunkId, buffer,
++ NULL);
++ }
++ yaffs_strncpy(name, oh->name, buffSize - 1);
++
++ yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
++ }
++
++ return yaffs_strlen(name);
++}
++
++int yaffs_GetObjectFileLength(yaffs_Object * obj)
++{
++
++ /* Dereference any hard linking */
++ obj = yaffs_GetEquivalentObject(obj);
++
++ if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
++ return obj->variant.fileVariant.fileSize;
++ }
++ if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
++ return yaffs_strlen(obj->variant.symLinkVariant.alias);
++ } else {
++ /* Only a directory should drop through to here */
++ return obj->myDev->nDataBytesPerChunk;
++ }
++}
++
++int yaffs_GetObjectLinkCount(yaffs_Object * obj)
++{
++ int count = 0;
++ struct list_head *i;
++
++ if (!obj->unlinked) {
++ count++; /* the object itself */
++ }
++ list_for_each(i, &obj->hardLinks) {
++ count++; /* add the hard links; */
++ }
++ return count;
++
++}
++
++int yaffs_GetObjectInode(yaffs_Object * obj)
++{
++ obj = yaffs_GetEquivalentObject(obj);
++
++ return obj->objectId;
++}
++
++unsigned yaffs_GetObjectType(yaffs_Object * obj)
++{
++ obj = yaffs_GetEquivalentObject(obj);
++
++ switch (obj->variantType) {
++ 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;
++ default:
++ return DT_REG;
++ break;
++ }
++}
++
++YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
++{
++ obj = yaffs_GetEquivalentObject(obj);
++ if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
++ return yaffs_CloneString(obj->variant.symLinkVariant.alias);
++ } else {
++ return yaffs_CloneString(_Y(""));
++ }
++}
++
++#ifndef CONFIG_YAFFS_WINCE
++
++int yaffs_SetAttributes(yaffs_Object * 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->ia_uid;
++ if (valid & ATTR_GID)
++ obj->yst_gid = attr->ia_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_ResizeFile(obj, attr->ia_size);
++
++ yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
++
++ return YAFFS_OK;
++
++}
++int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
++{
++ unsigned int valid = 0;
++
++ attr->ia_mode = obj->yst_mode;
++ valid |= ATTR_MODE;
++ attr->ia_uid = obj->yst_uid;
++ valid |= ATTR_UID;
++ attr->ia_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_GetFileSize(obj);
++ valid |= ATTR_SIZE;
++
++ attr->ia_valid = valid;
++
++ return YAFFS_OK;
++
++}
++
++#endif
++
++#if 0
++int yaffs_DumpObject(yaffs_Object * obj)
++{
++ YCHAR name[257];
++
++ yaffs_GetObjectName(obj, name, 256);
++
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR
++ ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
++ " chunk %d type %d size %d\n"
++ TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
++ obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
++ yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
++
++ return YAFFS_OK;
++}
++#endif
++
++/*---------------------------- Initialisation code -------------------------------------- */
++
++static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
++{
++
++ /* Common functions, gotta have */
++ if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
++ return 0;
++
++#ifdef CONFIG_YAFFS_YAFFS2
++
++ /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
++ if (dev->writeChunkWithTagsToNAND &&
++ dev->readChunkWithTagsFromNAND &&
++ !dev->writeChunkToNAND &&
++ !dev->readChunkFromNAND &&
++ dev->markNANDBlockBad && dev->queryNANDBlock)
++ return 1;
++#endif
++
++ /* Can use the "spare" style interface for yaffs1 */
++ if (!dev->isYaffs2 &&
++ !dev->writeChunkWithTagsToNAND &&
++ !dev->readChunkWithTagsFromNAND &&
++ dev->writeChunkToNAND &&
++ dev->readChunkFromNAND &&
++ !dev->markNANDBlockBad && !dev->queryNANDBlock)
++ return 1;
++
++ return 0; /* bad */
++}
++
++
++static void yaffs_CreateInitialDirectories(yaffs_Device *dev)
++{
++ /* Initialise the unlinked, deleted, root and lost and found directories */
++
++ dev->lostNFoundDir = dev->rootDir = NULL;
++ dev->unlinkedDir = dev->deletedDir = NULL;
++
++ dev->unlinkedDir =
++ yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
++ dev->deletedDir =
++ yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
++
++ dev->rootDir =
++ yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
++ YAFFS_ROOT_MODE | S_IFDIR);
++ dev->lostNFoundDir =
++ yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
++ YAFFS_LOSTNFOUND_MODE | S_IFDIR);
++ yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
++}
++
++int yaffs_GutsInitialise(yaffs_Device * dev)
++{
++ unsigned x;
++ int bits;
++
++ T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
++
++ /* Check stuff that must be set */
++
++ if (!dev) {
++ T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
++ return YAFFS_FAIL;
++ }
++
++ dev->internalStartBlock = dev->startBlock;
++ dev->internalEndBlock = dev->endBlock;
++ dev->blockOffset = 0;
++ dev->chunkOffset = 0;
++ dev->nFreeChunks = 0;
++
++ if (dev->startBlock == 0) {
++ dev->internalStartBlock = dev->startBlock + 1;
++ dev->internalEndBlock = dev->endBlock + 1;
++ dev->blockOffset = 1;
++ dev->chunkOffset = dev->nChunksPerBlock;
++ }
++
++ /* Check geometry parameters. */
++
++ if ((dev->isYaffs2 && dev->nDataBytesPerChunk < 1024) ||
++ (!dev->isYaffs2 && dev->nDataBytesPerChunk != 512) ||
++ dev->nChunksPerBlock < 2 ||
++ dev->nReservedBlocks < 2 ||
++ dev->internalStartBlock <= 0 ||
++ dev->internalEndBlock <= 0 ||
++ dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2) // otherwise it is too small
++ ) {
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR
++ ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
++ TENDSTR), dev->nDataBytesPerChunk, dev->isYaffs2 ? "2" : ""));
++ return YAFFS_FAIL;
++ }
++
++ if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
++ return YAFFS_FAIL;
++ }
++
++ /* Got the right mix of functions? */
++ if (!yaffs_CheckDevFunctions(dev)) {
++ /* Function missing */
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR
++ ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
++
++ return YAFFS_FAIL;
++ }
++
++ /* This is really a compilation check. */
++ if (!yaffs_CheckStructures()) {
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
++ return YAFFS_FAIL;
++ }
++
++ if (dev->isMounted) {
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR("yaffs: device already mounted\n" TENDSTR)));
++ return YAFFS_FAIL;
++ }
++
++ /* Finished with most checks. One or two more checks happen later on too. */
++
++ dev->isMounted = 1;
++
++
++
++ /* OK now calculate a few things for the device */
++
++ /*
++ * Calculate all the chunk size manipulation numbers:
++ */
++ /* Start off assuming it is a power of 2 */
++ dev->chunkShift = ShiftDiv(dev->nDataBytesPerChunk);
++ dev->chunkMask = (1<<dev->chunkShift) - 1;
++
++ if(dev->nDataBytesPerChunk == (dev->chunkMask + 1)){
++ /* Yes it is a power of 2, disable crumbs */
++ dev->crumbMask = 0;
++ dev->crumbShift = 0;
++ dev->crumbsPerChunk = 0;
++ } else {
++ /* Not a power of 2, use crumbs instead */
++ dev->crumbShift = ShiftDiv(sizeof(yaffs_PackedTags2TagsPart));
++ dev->crumbMask = (1<<dev->crumbShift)-1;
++ dev->crumbsPerChunk = dev->nDataBytesPerChunk/(1 << dev->crumbShift);
++ dev->chunkShift = 0;
++ dev->chunkMask = 0;
++ }
++
++
++ /*
++ * Calculate chunkGroupBits.
++ * We need to find the next power of 2 > than internalEndBlock
++ */
++
++ x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
++
++ bits = ShiftsGE(x);
++
++ /* Set up tnode width if wide tnodes are enabled. */
++ if(!dev->wideTnodesDisabled){
++ /* bits must be even so that we end up with 32-bit words */
++ if(bits & 1)
++ bits++;
++ if(bits < 16)
++ dev->tnodeWidth = 16;
++ else
++ dev->tnodeWidth = bits;
++ }
++ else
++ dev->tnodeWidth = 16;
++
++ dev->tnodeMask = (1<<dev->tnodeWidth)-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 chunkGroupSize
++ */
++
++ if (bits <= dev->tnodeWidth)
++ dev->chunkGroupBits = 0;
++ else
++ dev->chunkGroupBits = bits - dev->tnodeWidth;
++
++
++ dev->chunkGroupSize = 1 << dev->chunkGroupBits;
++
++ if (dev->nChunksPerBlock < dev->chunkGroupSize) {
++ /* 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".
++ */
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR("yaffs: chunk group too large\n" TENDSTR)));
++
++ return YAFFS_FAIL;
++ }
++
++ /* OK, we've finished verifying the device, lets continue with initialisation */
++
++ /* More device initialisation */
++ dev->garbageCollections = 0;
++ dev->passiveGarbageCollections = 0;
++ dev->currentDirtyChecker = 0;
++ dev->bufferedBlock = -1;
++ dev->doingBufferedBlockRewrite = 0;
++ dev->nDeletedFiles = 0;
++ dev->nBackgroundDeletions = 0;
++ dev->nUnlinkedFiles = 0;
++ dev->eccFixed = 0;
++ dev->eccUnfixed = 0;
++ dev->tagsEccFixed = 0;
++ dev->tagsEccUnfixed = 0;
++ dev->nErasureFailures = 0;
++ dev->nErasedBlocks = 0;
++ dev->isDoingGC = 0;
++ dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
++
++ /* Initialise temporary buffers and caches. */
++ {
++ int i;
++ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
++ dev->tempBuffer[i].line = 0; /* not in use */
++ dev->tempBuffer[i].buffer =
++ YMALLOC_DMA(dev->nDataBytesPerChunk);
++ }
++ }
++
++ if (dev->nShortOpCaches > 0) {
++ int i;
++
++ if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
++ dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
++ }
++
++ dev->srCache =
++ YMALLOC(dev->nShortOpCaches * sizeof(yaffs_ChunkCache));
++
++ for (i = 0; i < dev->nShortOpCaches; i++) {
++ dev->srCache[i].object = NULL;
++ dev->srCache[i].lastUse = 0;
++ dev->srCache[i].dirty = 0;
++ dev->srCache[i].data = YMALLOC_DMA(dev->nDataBytesPerChunk);
++ }
++ dev->srLastUse = 0;
++ }
++
++ dev->cacheHits = 0;
++
++ dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
++
++ if (dev->isYaffs2) {
++ dev->useHeaderFileSize = 1;
++ }
++
++ yaffs_InitialiseBlocks(dev);
++ yaffs_InitialiseTnodes(dev);
++ yaffs_InitialiseObjects(dev);
++
++ yaffs_CreateInitialDirectories(dev);
++
++
++ /* Now scan the flash. */
++ if (dev->isYaffs2) {
++ if(yaffs_CheckpointRestore(dev)) {
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR("yaffs: restored from checkpoint" TENDSTR)));
++ } else {
++
++ /* Clean up the mess caused by an aborted checkpoint load
++ * and scan backwards.
++ */
++ yaffs_DeinitialiseBlocks(dev);
++ yaffs_DeinitialiseTnodes(dev);
++ yaffs_DeinitialiseObjects(dev);
++ yaffs_InitialiseBlocks(dev);
++ yaffs_InitialiseTnodes(dev);
++ yaffs_InitialiseObjects(dev);
++ yaffs_CreateInitialDirectories(dev);
++
++ yaffs_ScanBackwards(dev);
++ }
++ }else
++ yaffs_Scan(dev);
++
++ /* Zero out stats */
++ dev->nPageReads = 0;
++ dev->nPageWrites = 0;
++ dev->nBlockErasures = 0;
++ dev->nGCCopies = 0;
++ dev->nRetriedWrites = 0;
++
++ dev->nRetiredBlocks = 0;
++
++ yaffs_VerifyFreeChunks(dev);
++
++ T(YAFFS_TRACE_TRACING,
++ (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
++ return YAFFS_OK;
++
++}
++
++void yaffs_Deinitialise(yaffs_Device * dev)
++{
++ if (dev->isMounted) {
++ int i;
++
++ yaffs_DeinitialiseBlocks(dev);
++ yaffs_DeinitialiseTnodes(dev);
++ yaffs_DeinitialiseObjects(dev);
++ if (dev->nShortOpCaches > 0) {
++
++ for (i = 0; i < dev->nShortOpCaches; i++) {
++ YFREE(dev->srCache[i].data);
++ }
++
++ YFREE(dev->srCache);
++ }
++
++ YFREE(dev->gcCleanupList);
++
++ for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
++ YFREE(dev->tempBuffer[i].buffer);
++ }
++
++ dev->isMounted = 0;
++ }
++
++}
++
++static int yaffs_CountFreeChunks(yaffs_Device * dev)
++{
++ int nFree;
++ int b;
++
++ yaffs_BlockInfo *blk;
++
++ for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
++ b++) {
++ blk = yaffs_GetBlockInfo(dev, b);
++
++ switch (blk->blockState) {
++ case YAFFS_BLOCK_STATE_EMPTY:
++ case YAFFS_BLOCK_STATE_ALLOCATING:
++ case YAFFS_BLOCK_STATE_COLLECTING:
++ case YAFFS_BLOCK_STATE_FULL:
++ nFree +=
++ (dev->nChunksPerBlock - blk->pagesInUse +
++ blk->softDeletions);
++ break;
++ default:
++ break;
++ }
++
++ }
++
++ return nFree;
++}
++
++int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
++{
++ /* This is what we report to the outside world */
++
++ int nFree;
++ int nDirtyCacheChunks;
++ int blocksForCheckpoint;
++
++#if 1
++ nFree = dev->nFreeChunks;
++#else
++ nFree = yaffs_CountFreeChunks(dev);
++#endif
++
++ nFree += dev->nDeletedFiles;
++
++ /* Now count the number of dirty chunks in the cache and subtract those */
++
++ {
++ int i;
++ for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
++ if (dev->srCache[i].dirty)
++ nDirtyCacheChunks++;
++ }
++ }
++
++ nFree -= nDirtyCacheChunks;
++
++ nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
++
++ /* Now we figure out how much to reserve for the checkpoint and report that... */
++ blocksForCheckpoint = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
++ if(blocksForCheckpoint < 0)
++ blocksForCheckpoint = 0;
++
++ nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
++
++ if (nFree < 0)
++ nFree = 0;
++
++ return nFree;
++
++}
++
++static int yaffs_freeVerificationFailures;
++
++static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
++{
++ int counted = yaffs_CountFreeChunks(dev);
++
++ int difference = dev->nFreeChunks - counted;
++
++ if (difference) {
++ T(YAFFS_TRACE_ALWAYS,
++ (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
++ dev->nFreeChunks, counted, difference));
++ yaffs_freeVerificationFailures++;
++ }
++}
++
++/*---------------------------------------- YAFFS test code ----------------------*/
++
++#define yaffs_CheckStruct(structure,syze, name) \
++ if(sizeof(structure) != syze) \
++ { \
++ T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
++ name,syze,sizeof(structure))); \
++ return YAFFS_FAIL; \
++ }
++
++static int yaffs_CheckStructures(void)
++{
++/* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
++/* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
++/* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
++#ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
++ yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
++#endif
++ yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")
++
++ return YAFFS_OK;
++}
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_guts.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_guts.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,889 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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 "devextras.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
++
++#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 6
++
++#ifndef CONFIG_YAFFS_NO_YAFFS1
++#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)
++#endif
++
++#define YAFFS_MIN_YAFFS2_CHUNK_SIZE 1024
++#define YAFFS_MIN_YAFFS2_SPARE_SIZE 32
++
++#define YAFFS_MAX_CHUNK_ID 0x000FFFFF
++
++#define YAFFS_UNUSED_OBJECT_ID 0x0003FFFF
++
++#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_NCHECKPOINT_OBJECTS 5000
++
++#define YAFFS_CHECKPOINT_VERSION 2
++
++#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
++
++/* Sseudo object ids for checkpointing */
++#define YAFFS_OBJECTID_SB_HEADER 0x10
++#define YAFFS_OBJECTID_CHECKPOINT_DATA 0x20
++#define YAFFS_SEQUENCE_CHECKPOINT_DATA 0x21
++
++/* */
++
++#define YAFFS_MAX_SHORT_OP_CACHES 20
++
++#define YAFFS_N_TEMP_BUFFERS 4
++
++/* 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 per 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
++
++/* ChunkCache is used for short read/write operations.*/
++typedef struct {
++ struct yaffs_ObjectStruct *object;
++ int chunkId;
++ int lastUse;
++ int dirty;
++ int nBytes; /* Only valid if the cache is dirty */
++ int locked; /* Can't push out or flush while locked. */
++#ifdef CONFIG_YAFFS_YAFFS2
++ __u8 *data;
++#else
++ __u8 data[YAFFS_BYTES_PER_CHUNK];
++#endif
++} yaffs_ChunkCache;
++
++
++
++/* Tags structures in RAM
++ * NB This uses bitfield. Bitfields should not straddle a u32 boundary otherwise
++ * the structure size will get blown out.
++ */
++
++#ifndef CONFIG_YAFFS_NO_YAFFS1
++typedef struct {
++ unsigned chunkId:20;
++ unsigned serialNumber:2;
++ unsigned byteCount:10;
++ unsigned objectId:18;
++ unsigned ecc:12;
++ unsigned unusedStuff:2;
++
++} yaffs_Tags;
++
++typedef union {
++ yaffs_Tags asTags;
++ __u8 asBytes[8];
++} yaffs_TagsUnion;
++
++#endif
++
++/* Stuff used for extended tags in YAFFS2 */
++
++typedef enum {
++ YAFFS_ECC_RESULT_UNKNOWN,
++ YAFFS_ECC_RESULT_NO_ERROR,
++ YAFFS_ECC_RESULT_FIXED,
++ YAFFS_ECC_RESULT_UNFIXED
++} yaffs_ECCResult;
++
++typedef enum {
++ YAFFS_OBJECT_TYPE_UNKNOWN,
++ YAFFS_OBJECT_TYPE_FILE,
++ YAFFS_OBJECT_TYPE_SYMLINK,
++ YAFFS_OBJECT_TYPE_DIRECTORY,
++ YAFFS_OBJECT_TYPE_HARDLINK,
++ YAFFS_OBJECT_TYPE_SPECIAL
++} yaffs_ObjectType;
++
++typedef struct {
++
++ unsigned validMarker0;
++ unsigned chunkUsed; /* Status of the chunk: used or unused */
++ unsigned objectId; /* If 0 then this is not part of an object (unused) */
++ unsigned chunkId; /* If 0 then this is a header, else a data chunk */
++ unsigned byteCount; /* Only valid for data chunks */
++
++ /* The following stuff only has meaning when we read */
++ yaffs_ECCResult eccResult;
++ unsigned blockBad;
++
++ /* YAFFS 1 stuff */
++ unsigned chunkDeleted; /* The chunk is marked deleted */
++ unsigned serialNumber; /* Yaffs1 2-bit serial number */
++
++ /* YAFFS2 stuff */
++ unsigned sequenceNumber; /* The sequence number of this block */
++
++ /* Extra info if this is an object header (YAFFS2 only) */
++
++ unsigned extraHeaderInfoAvailable; /* There is extra info available if this is not zero */
++ unsigned extraParentObjectId; /* The parent object */
++ unsigned extraIsShrinkHeader; /* Is it a shrink header? */
++ unsigned extraShadows; /* Does this shadow another object? */
++
++ yaffs_ObjectType extraObjectType; /* What object type? */
++
++ unsigned extraFileLength; /* Length if it is a file */
++ unsigned extraEquivalentObjectId; /* Equivalent object Id if it is a hard link */
++
++ unsigned validMarker1;
++
++} yaffs_ExtendedTags;
++
++/* Spare structure for YAFFS1 */
++typedef struct {
++ __u8 tagByte0;
++ __u8 tagByte1;
++ __u8 tagByte2;
++ __u8 tagByte3;
++ __u8 pageStatus; /* set to 0 to delete the chunk */
++ __u8 blockStatus;
++ __u8 tagByte4;
++ __u8 tagByte5;
++ __u8 ecc1[3];
++ __u8 tagByte6;
++ __u8 tagByte7;
++ __u8 ecc2[3];
++} yaffs_Spare;
++
++/*Special structure for passing through to mtd */
++struct yaffs_NANDSpare {
++ yaffs_Spare spare;
++ int eccres1;
++ int eccres2;
++};
++
++/* Block data in RAM */
++
++typedef enum {
++ YAFFS_BLOCK_STATE_UNKNOWN = 0,
++
++ YAFFS_BLOCK_STATE_SCANNING,
++ YAFFS_BLOCK_STATE_NEEDS_SCANNING,
++ /* 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 yaffs_Scan.
++ * 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
++ */
++
++ YAFFS_BLOCK_STATE_FULL,
++ /* All the pages in this block have been allocated.
++ */
++
++ YAFFS_BLOCK_STATE_DIRTY,
++ /* All pages have been allocated and 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 */
++} yaffs_BlockState;
++
++typedef struct {
++
++ int softDeletions:10; /* number of soft deleted pages */
++ int pagesInUse:10; /* number of pages in use */
++ yaffs_BlockState blockState:4; /* One of the above block states */
++ __u32 needsRetiring:1; /* Data has failed on this block, need to get valid data off */
++ /* and retire the block. */
++ __u32 skipErasedCheck: 1; /* If this is set we can skip the erased check on this block */
++ __u32 gcPrioritise: 1; /* An ECC check or bank check has failed on this block.
++ It should be prioritised for GC */
++ __u32 chunkErrorStrikes:3; /* How many times we've had ecc etc failures on this block and tried to reuse it */
++
++#ifdef CONFIG_YAFFS_YAFFS2
++ __u32 hasShrinkHeader:1; /* This block has at least one shrink object header */
++ __u32 sequenceNumber; /* block sequence number for yaffs2 */
++#endif
++
++} yaffs_BlockInfo;
++
++/* -------------------------- Object structure -------------------------------*/
++/* This is the object structure as stored on NAND */
++
++typedef struct {
++ yaffs_ObjectType type;
++
++ /* Apply to everything */
++ int parentObjectId;
++ __u16 sum__NoLongerUsed; /* checksum of name. No longer used */
++ YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
++
++ /* Thes following apply to directories, files, symlinks - not hard links */
++ __u32 yst_mode; /* protection */
++
++#ifdef CONFIG_YAFFS_WINCE
++ __u32 notForWinCE[5];
++#else
++ __u32 yst_uid;
++ __u32 yst_gid;
++ __u32 yst_atime;
++ __u32 yst_mtime;
++ __u32 yst_ctime;
++#endif
++
++ /* File size applies to files only */
++ int fileSize;
++
++ /* Equivalent object id applies to hard links only. */
++ int equivalentObjectId;
++
++ /* Alias is for symlinks only. */
++ YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1];
++
++ __u32 yst_rdev; /* device stuff for block and char devices (major/min) */
++
++#ifdef CONFIG_YAFFS_WINCE
++ __u32 win_ctime[2];
++ __u32 win_atime[2];
++ __u32 win_mtime[2];
++ __u32 roomToGrow[4];
++#else
++ __u32 roomToGrow[10];
++#endif
++
++ int shadowsObject; /* This object header shadows the specified object if > 0 */
++
++ /* isShrink applies to object headers written when we shrink the file (ie resize) */
++ __u32 isShrink;
++
++} yaffs_ObjectHeader;
++
++/*--------------------------- Tnode -------------------------- */
++
++union yaffs_Tnode_union {
++#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
++ union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL + 1];
++#else
++ union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL];
++#endif
++/* __u16 level0[YAFFS_NTNODES_LEVEL0]; */
++
++};
++
++typedef union yaffs_Tnode_union yaffs_Tnode;
++
++struct yaffs_TnodeList_struct {
++ struct yaffs_TnodeList_struct *next;
++ yaffs_Tnode *tnodes;
++};
++
++typedef struct yaffs_TnodeList_struct yaffs_TnodeList;
++
++/*------------------------ 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
++ */
++
++typedef struct {
++ __u32 fileSize;
++ __u32 scannedFileSize;
++ __u32 shrinkSize;
++ int topLevel;
++ yaffs_Tnode *top;
++} yaffs_FileStructure;
++
++typedef struct {
++ struct list_head children; /* list of child links */
++} yaffs_DirectoryStructure;
++
++typedef struct {
++ YCHAR *alias;
++} yaffs_SymLinkStructure;
++
++typedef struct {
++ struct yaffs_ObjectStruct *equivalentObject;
++ __u32 equivalentObjectId;
++} yaffs_HardLinkStructure;
++
++typedef union {
++ yaffs_FileStructure fileVariant;
++ yaffs_DirectoryStructure directoryVariant;
++ yaffs_SymLinkStructure symLinkVariant;
++ yaffs_HardLinkStructure hardLinkVariant;
++} yaffs_ObjectVariant;
++
++struct yaffs_ObjectStruct {
++ __u8 deleted:1; /* This should only apply to unlinked files. */
++ __u8 softDeleted:1; /* it has also been soft deleted */
++ __u8 unlinked:1; /* An unlinked file. The file should be in the unlinked directory.*/
++ __u8 fake:1; /* A fake object has no presence on NAND. */
++ __u8 renameAllowed:1; /* Some objects are not allowed to be renamed. */
++ __u8 unlinkAllowed: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 records appear before the header).
++ */
++ __u8 lazyLoaded:1; /* This object has been lazy loaded and is missing some detail */
++
++ __u8 deferedFree:1; /* For Linux kernel. Object is removed from NAND, but is
++ * still in the inode cache. Free of object is defered.
++ * until the inode is released.
++ */
++
++ __u8 serial; /* serial number of chunk in NAND. Cached here */
++ __u16 sum; /* sum of the name to speed searching */
++
++ struct yaffs_DeviceStruct *myDev; /* The device I'm on */
++
++ struct list_head hashLink; /* list of objects in this hash bucket */
++
++ struct list_head hardLinks; /* all the equivalent hard linked objects */
++
++ /* directory structure stuff */
++ /* also used for linking up the free list */
++ struct yaffs_ObjectStruct *parent;
++ struct list_head siblings;
++
++ /* Where's my object header in NAND? */
++ int chunkId;
++
++ int nDataChunks; /* Number of data chunks attached to the file. */
++
++ __u32 objectId; /* the object id value */
++
++ __u32 yst_mode;
++
++#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
++ YCHAR shortName[YAFFS_SHORT_NAME_LENGTH + 1];
++#endif
++
++#ifndef __KERNEL__
++ __u32 inUse;
++#endif
++
++#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;
++
++#ifdef __KERNEL__
++ struct inode *myInode;
++
++#endif
++
++ yaffs_ObjectType variantType;
++
++ yaffs_ObjectVariant variant;
++
++};
++
++typedef struct yaffs_ObjectStruct yaffs_Object;
++
++struct yaffs_ObjectList_struct {
++ yaffs_Object *objects;
++ struct yaffs_ObjectList_struct *next;
++};
++
++typedef struct yaffs_ObjectList_struct yaffs_ObjectList;
++
++typedef struct {
++ struct list_head list;
++ int count;
++} yaffs_ObjectBucket;
++
++
++/* yaffs_CheckpointObject holds the definition of an object as dumped
++ * by checkpointing.
++ */
++
++typedef struct {
++ int structType;
++ __u32 objectId;
++ __u32 parentId;
++ int chunkId;
++
++ yaffs_ObjectType variantType:3;
++ __u8 deleted:1;
++ __u8 softDeleted:1;
++ __u8 unlinked:1;
++ __u8 fake:1;
++ __u8 renameAllowed:1;
++ __u8 unlinkAllowed:1;
++ __u8 serial;
++
++ int nDataChunks;
++ __u32 fileSizeOrEquivalentObjectId;
++
++}yaffs_CheckpointObject;
++
++/*--------------------- Temporary buffers ----------------
++ *
++ * These are chunk-sized working buffers. Each device has a few
++ */
++
++typedef struct {
++ __u8 *buffer;
++ int line; /* track from whence this buffer was allocated */
++ int maxLine;
++} yaffs_TempBuffer;
++
++/*----------------- Device ---------------------------------*/
++
++struct yaffs_DeviceStruct {
++ struct list_head devList;
++ const char *name;
++
++ /* Entry parameters set up way early. Yaffs sets up the rest.*/
++ int nDataBytesPerChunk; /* Should be a power of 2 >= 512 */
++ int nChunksPerBlock; /* does not need to be a power of 2 */
++ int nBytesPerSpare; /* spare area size */
++ int startBlock; /* Start block we're allowed to use */
++ int endBlock; /* End block we're allowed to use */
++ int nReservedBlocks; /* We want this tuneable so that we can reduce */
++ /* reserved blocks on NOR and RAM. */
++
++ /* Stuff used by the partitioned checkpointing mechanism */
++ int checkpointStartBlock;
++ int checkpointEndBlock;
++
++ /* Stuff used by the shared space checkpointing mechanism */
++ /* If this value is zero, then this mechanism is disabled */
++
++ int nCheckpointReservedBlocks; /* Blocks to reserve for checkpoint data */
++
++
++
++
++ int nShortOpCaches; /* If <= 0, then short op caching is disabled, else
++ * the number of short op caches (don't use too many)
++ */
++
++ int useHeaderFileSize; /* Flag to determine if we should use file sizes from the header */
++
++ int useNANDECC; /* Flag to decide whether or not to use NANDECC */
++
++ void *genericDevice; /* Pointer to device context
++ * On an mtd this holds the mtd pointer.
++ */
++ void *superBlock;
++
++ /* NAND access functions (Must be set before calling YAFFS)*/
++
++ int (*writeChunkToNAND) (struct yaffs_DeviceStruct * dev,
++ int chunkInNAND, const __u8 * data,
++ const yaffs_Spare * spare);
++ int (*readChunkFromNAND) (struct yaffs_DeviceStruct * dev,
++ int chunkInNAND, __u8 * data,
++ yaffs_Spare * spare);
++ int (*eraseBlockInNAND) (struct yaffs_DeviceStruct * dev,
++ int blockInNAND);
++ int (*initialiseNAND) (struct yaffs_DeviceStruct * dev);
++
++#ifdef CONFIG_YAFFS_YAFFS2
++ int (*writeChunkWithTagsToNAND) (struct yaffs_DeviceStruct * dev,
++ int chunkInNAND, const __u8 * data,
++ const yaffs_ExtendedTags * tags);
++ int (*readChunkWithTagsFromNAND) (struct yaffs_DeviceStruct * dev,
++ int chunkInNAND, __u8 * data,
++ yaffs_ExtendedTags * tags);
++ int (*markNANDBlockBad) (struct yaffs_DeviceStruct * dev, int blockNo);
++ int (*queryNANDBlock) (struct yaffs_DeviceStruct * dev, int blockNo,
++ yaffs_BlockState * state, int *sequenceNumber);
++#endif
++
++ int isYaffs2;
++
++ /* The removeObjectCallback function must be supplied by OS flavours that
++ * need it. The Linux kernel does not use this, but yaffs direct does use
++ * it to implement the faster readdir
++ */
++ void (*removeObjectCallback)(struct yaffs_ObjectStruct *obj);
++
++ /* Callback to mark the superblock dirsty */
++ void (*markSuperBlockDirty)(void * superblock);
++
++ int wideTnodesDisabled; /* Set to disable wide tnodes */
++
++
++ /* End of stuff that must be set before initialisation. */
++
++ /* Runtime parameters. Set up by YAFFS. */
++
++ __u16 chunkGroupBits; /* 0 for devices <= 32MB. else log2(nchunks) - 16 */
++ __u16 chunkGroupSize; /* == 2^^chunkGroupBits */
++
++ /* Stuff to support wide tnodes */
++ __u32 tnodeWidth;
++ __u32 tnodeMask;
++
++ /* Stuff to support various file offses to chunk/offset translations */
++ /* "Crumbs" for nDataBytesPerChunk not being a power of 2 */
++ __u32 crumbMask;
++ __u32 crumbShift;
++ __u32 crumbsPerChunk;
++
++ /* Straight shifting for nDataBytesPerChunk being a power of 2 */
++ __u32 chunkShift;
++ __u32 chunkMask;
++
++
++#ifdef __KERNEL__
++
++ struct semaphore sem; /* Semaphore for waiting on erasure.*/
++ struct semaphore grossLock; /* Gross locking semaphore */
++ __u8 *spareBuffer; /* For mtdif2 use. Don't know the size of the buffer
++ * at compile time so we have to allocate it.
++ */
++ void (*putSuperFunc) (struct super_block * sb);
++#endif
++
++ int isMounted;
++
++ int isCheckpointed;
++
++
++ /* Stuff to support block offsetting to support start block zero */
++ int internalStartBlock;
++ int internalEndBlock;
++ int blockOffset;
++ int chunkOffset;
++
++
++ /* Runtime checkpointing stuff */
++ int checkpointPageSequence; /* running sequence number of checkpoint pages */
++ int checkpointByteCount;
++ int checkpointByteOffset;
++ __u8 *checkpointBuffer;
++ int checkpointOpenForWrite;
++ int blocksInCheckpoint;
++ int checkpointCurrentChunk;
++ int checkpointCurrentBlock;
++ int checkpointNextBlock;
++ int *checkpointBlockList;
++ int checkpointMaxBlocks;
++
++ /* Block Info */
++ yaffs_BlockInfo *blockInfo;
++ __u8 *chunkBits; /* bitmap of chunks in use */
++ unsigned blockInfoAlt:1; /* was allocated using alternative strategy */
++ unsigned chunkBitsAlt:1; /* was allocated using alternative strategy */
++ int chunkBitmapStride; /* Number of bytes of chunkBits per block.
++ * Must be consistent with nChunksPerBlock.
++ */
++
++ int nErasedBlocks;
++ int allocationBlock; /* Current block being allocated off */
++ __u32 allocationPage;
++ int allocationBlockFinder; /* Used to search for next allocation block */
++
++ /* Runtime state */
++ int nTnodesCreated;
++ yaffs_Tnode *freeTnodes;
++ int nFreeTnodes;
++ yaffs_TnodeList *allocatedTnodeList;
++
++ int isDoingGC;
++
++ int nObjectsCreated;
++ yaffs_Object *freeObjects;
++ int nFreeObjects;
++
++ yaffs_ObjectList *allocatedObjectList;
++
++ yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS];
++
++ int nFreeChunks;
++
++ int currentDirtyChecker; /* Used to find current dirtiest block */
++
++ __u32 *gcCleanupList; /* objects to delete at the end of a GC. */
++
++ /* Statistcs */
++ int nPageWrites;
++ int nPageReads;
++ int nBlockErasures;
++ int nErasureFailures;
++ int nGCCopies;
++ int garbageCollections;
++ int passiveGarbageCollections;
++ int nRetriedWrites;
++ int nRetiredBlocks;
++ int eccFixed;
++ int eccUnfixed;
++ int tagsEccFixed;
++ int tagsEccUnfixed;
++ int nDeletions;
++ int nUnmarkedDeletions;
++
++ int hasPendingPrioritisedGCs; /* We think this device might have pending prioritised gcs */
++
++ /* Special directories */
++ yaffs_Object *rootDir;
++ yaffs_Object *lostNFoundDir;
++
++ /* Buffer areas for storing data to recover from write failures TODO
++ * __u8 bufferedData[YAFFS_CHUNKS_PER_BLOCK][YAFFS_BYTES_PER_CHUNK];
++ * yaffs_Spare bufferedSpare[YAFFS_CHUNKS_PER_BLOCK];
++ */
++
++ int bufferedBlock; /* Which block is buffered here? */
++ int doingBufferedBlockRewrite;
++
++ yaffs_ChunkCache *srCache;
++ int srLastUse;
++
++ int cacheHits;
++
++ /* Stuff for background deletion and unlinked files.*/
++ yaffs_Object *unlinkedDir; /* Directory where unlinked and deleted files live. */
++ yaffs_Object *deletedDir; /* Directory where deleted objects are sent to disappear. */
++ yaffs_Object *unlinkedDeletion; /* Current file being background deleted.*/
++ int nDeletedFiles; /* Count of files awaiting deletion;*/
++ int nUnlinkedFiles; /* Count of unlinked files. */
++ int nBackgroundDeletions; /* Count of background deletions. */
++
++
++ yaffs_TempBuffer tempBuffer[YAFFS_N_TEMP_BUFFERS];
++ int maxTemp;
++ int unmanagedTempAllocations;
++ int unmanagedTempDeallocations;
++
++ /* yaffs2 runtime stuff */
++ unsigned sequenceNumber; /* Sequence number of currently allocating block */
++ unsigned oldestDirtySequence;
++
++};
++
++typedef struct yaffs_DeviceStruct yaffs_Device;
++
++/* The static layout of bllock usage etc is stored in the super block header */
++typedef struct {
++ int StructType;
++ int version;
++ int checkpointStartBlock;
++ int checkpointEndBlock;
++ int startBlock;
++ int endBlock;
++ int rfu[100];
++} yaffs_SuperBlockHeader;
++
++/* The CheckpointDevice structure holds the device information that changes at runtime and
++ * must be preserved over unmount/mount cycles.
++ */
++typedef struct {
++ int structType;
++ int nErasedBlocks;
++ int allocationBlock; /* Current block being allocated off */
++ __u32 allocationPage;
++ int nFreeChunks;
++
++ int nDeletedFiles; /* Count of files awaiting deletion;*/
++ int nUnlinkedFiles; /* Count of unlinked files. */
++ int nBackgroundDeletions; /* Count of background deletions. */
++
++ /* yaffs2 runtime stuff */
++ unsigned sequenceNumber; /* Sequence number of currently allocating block */
++ unsigned oldestDirtySequence;
++
++} yaffs_CheckpointDevice;
++
++
++typedef struct {
++ int structType;
++ __u32 magic;
++ __u32 version;
++ __u32 head;
++} yaffs_CheckpointValidity;
++
++/* Function to manipulate block info */
++static Y_INLINE yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blk)
++{
++ if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("**>> yaffs: getBlockInfo block %d is not valid" TENDSTR),
++ blk));
++ YBUG();
++ }
++ return &dev->blockInfo[blk - dev->internalStartBlock];
++}
++
++/*----------------------- YAFFS Functions -----------------------*/
++
++int yaffs_GutsInitialise(yaffs_Device * dev);
++void yaffs_Deinitialise(yaffs_Device * dev);
++
++int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev);
++
++int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
++ yaffs_Object * newDir, const YCHAR * newName);
++
++int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name);
++int yaffs_DeleteFile(yaffs_Object * obj);
++
++int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize);
++int yaffs_GetObjectFileLength(yaffs_Object * obj);
++int yaffs_GetObjectInode(yaffs_Object * obj);
++unsigned yaffs_GetObjectType(yaffs_Object * obj);
++int yaffs_GetObjectLinkCount(yaffs_Object * obj);
++
++int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr);
++int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr);
++
++/* File operations */
++int yaffs_ReadDataFromFile(yaffs_Object * obj, __u8 * buffer, loff_t offset,
++ int nBytes);
++int yaffs_WriteDataToFile(yaffs_Object * obj, const __u8 * buffer, loff_t offset,
++ int nBytes, int writeThrough);
++int yaffs_ResizeFile(yaffs_Object * obj, loff_t newSize);
++
++yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
++ __u32 mode, __u32 uid, __u32 gid);
++int yaffs_FlushFile(yaffs_Object * obj, int updateTime);
++
++/* Flushing and checkpointing */
++void yaffs_FlushEntireDeviceCache(yaffs_Device *dev);
++
++int yaffs_CheckpointSave(yaffs_Device *dev);
++int yaffs_CheckpointRestore(yaffs_Device *dev);
++
++/* Directory operations */
++yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
++ __u32 mode, __u32 uid, __u32 gid);
++yaffs_Object *yaffs_FindObjectByName(yaffs_Object * theDir, const YCHAR * name);
++int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
++ int (*fn) (yaffs_Object *));
++
++yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number);
++
++/* Link operations */
++yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
++ yaffs_Object * equivalentObject);
++
++yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj);
++
++/* Symlink operations */
++yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
++ __u32 mode, __u32 uid, __u32 gid,
++ const YCHAR * alias);
++YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj);
++
++/* Special inodes (fifos, sockets and devices) */
++yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
++ __u32 mode, __u32 uid, __u32 gid, __u32 rdev);
++
++/* Special directories */
++yaffs_Object *yaffs_Root(yaffs_Device * dev);
++yaffs_Object *yaffs_LostNFound(yaffs_Device * dev);
++
++#ifdef CONFIG_YAFFS_WINCE
++/* CONFIG_YAFFS_WINCE special stuff */
++void yfsd_WinFileTimeNow(__u32 target[2]);
++#endif
++
++#ifdef __KERNEL__
++
++void yaffs_HandleDeferedFree(yaffs_Object * obj);
++#endif
++
++/* Debug dump */
++int yaffs_DumpObject(yaffs_Object * obj);
++
++void yaffs_GutsTest(yaffs_Device * dev);
++
++/* A few useful functions */
++void yaffs_InitialiseTags(yaffs_ExtendedTags * tags);
++void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn);
++int yaffs_CheckFF(__u8 * buffer, int nBytes);
++void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi);
++
++#endif
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_mtdif.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_mtdif.c 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,241 @@
++/*
++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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.
++ */
++
++const char *yaffs_mtdif_c_version =
++ "$Id: yaffs_mtdif.c,v 1.19 2007/02/14 01:09:06 wookey Exp $";
++
++#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"
++
++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18))
++static struct nand_oobinfo yaffs_oobinfo = {
++ .useecc = 1,
++ .eccbytes = 6,
++ .eccpos = {8, 9, 10, 13, 14, 15}
++};
++
++static struct nand_oobinfo yaffs_noeccinfo = {
++ .useecc = 0,
++};
++#endif
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++static inline void translate_spare2oob(const yaffs_Spare *spare, __u8 *oob)
++{
++ oob[0] = spare->tagByte0;
++ oob[1] = spare->tagByte1;
++ oob[2] = spare->tagByte2;
++ oob[3] = spare->tagByte3;
++ oob[4] = spare->tagByte4;
++ oob[5] = spare->tagByte5 & 0x3f;
++ oob[5] |= spare->blockStatus == 'Y' ? 0: 0x80;
++ oob[5] |= spare->pageStatus == 0 ? 0: 0x40;
++ oob[6] = spare->tagByte6;
++ oob[7] = spare->tagByte7;
++}
++
++static inline void translate_oob2spare(yaffs_Spare *spare, __u8 *oob)
++{
++ struct yaffs_NANDSpare *nspare = (struct yaffs_NANDSpare *)spare;
++ spare->tagByte0 = oob[0];
++ spare->tagByte1 = oob[1];
++ spare->tagByte2 = oob[2];
++ spare->tagByte3 = oob[3];
++ spare->tagByte4 = oob[4];
++ spare->tagByte5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
++ spare->blockStatus = oob[5] & 0x80 ? 0xff : 'Y';
++ spare->pageStatus = oob[5] & 0x40 ? 0xff : 0;
++ spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
++ spare->tagByte6 = oob[6];
++ spare->tagByte7 = oob[7];
++ spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
++
++ nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
++}
++#endif
++
++int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
++ const __u8 * data, const yaffs_Spare * spare)
++{
++ struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ struct mtd_oob_ops ops;
++#endif
++ size_t dummy;
++ int retval = 0;
++
++ loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ __u8 spareAsBytes[8]; /* OOB */
++
++ if (data && !spare)
++ retval = mtd->write(mtd, addr, dev->nDataBytesPerChunk,
++ &dummy, data);
++ else if (spare) {
++ if (dev->useNANDECC) {
++ translate_spare2oob(spare, spareAsBytes);
++ ops.mode = MTD_OOB_AUTO;
++ ops.ooblen = 8; /* temp hack */
++ } else {
++ ops.mode = MTD_OOB_RAW;
++ ops.ooblen = YAFFS_BYTES_PER_SPARE;
++ }
++ ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
++ ops.datbuf = (u8 *)data;
++ ops.ooboffs = 0;
++ ops.oobbuf = spareAsBytes;
++ retval = mtd->write_oob(mtd, addr, &ops);
++ }
++#else
++ __u8 *spareAsBytes = (__u8 *) spare;
++
++ if (data && spare) {
++ if (dev->useNANDECC)
++ retval =
++ mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
++ &dummy, data, spareAsBytes,
++ &yaffs_oobinfo);
++ else
++ retval =
++ mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
++ &dummy, data, spareAsBytes,
++ &yaffs_noeccinfo);
++ } else {
++ if (data)
++ retval =
++ mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
++ data);
++ if (spare)
++ retval =
++ mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
++ &dummy, spareAsBytes);
++ }
++#endif
++
++ if (retval == 0)
++ return YAFFS_OK;
++ else
++ return YAFFS_FAIL;
++}
++
++int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
++ yaffs_Spare * spare)
++{
++ struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ struct mtd_oob_ops ops;
++#endif
++ size_t dummy;
++ int retval = 0;
++
++ loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ __u8 spareAsBytes[8]; /* OOB */
++
++ if (data && !spare)
++ retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
++ &dummy, data);
++ else if (spare) {
++ if (dev->useNANDECC) {
++ ops.mode = MTD_OOB_AUTO;
++ ops.ooblen = 8; /* temp hack */
++ } else {
++ ops.mode = MTD_OOB_RAW;
++ ops.ooblen = YAFFS_BYTES_PER_SPARE;
++ }
++ ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
++ ops.datbuf = data;
++ ops.ooboffs = 0;
++ ops.oobbuf = spareAsBytes;
++ retval = mtd->read_oob(mtd, addr, &ops);
++ if (dev->useNANDECC)
++ translate_oob2spare(spare, spareAsBytes);
++ }
++#else
++ __u8 *spareAsBytes = (__u8 *) spare;
++
++ if (data && spare) {
++ if (dev->useNANDECC) {
++ /* Careful, this call adds 2 ints */
++ /* to the end of the spare data. Calling function */
++ /* should allocate enough memory for spare, */
++ /* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
++ retval =
++ mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
++ &dummy, data, spareAsBytes,
++ &yaffs_oobinfo);
++ } else {
++ retval =
++ mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
++ &dummy, data, spareAsBytes,
++ &yaffs_noeccinfo);
++ }
++ } else {
++ if (data)
++ retval =
++ mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
++ data);
++ if (spare)
++ retval =
++ mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
++ &dummy, spareAsBytes);
++ }
++#endif
++
++ if (retval == 0)
++ return YAFFS_OK;
++ else
++ return YAFFS_FAIL;
++}
++
++int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber)
++{
++ struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
++ __u32 addr =
++ ((loff_t) blockNumber) * dev->nDataBytesPerChunk
++ * dev->nChunksPerBlock;
++ struct erase_info ei;
++ int retval = 0;
++
++ ei.mtd = mtd;
++ ei.addr = addr;
++ ei.len = dev->nDataBytesPerChunk * dev->nChunksPerBlock;
++ ei.time = 1000;
++ ei.retries = 2;
++ ei.callback = NULL;
++ ei.priv = (u_long) dev;
++
++ /* Todo finish off the ei if required */
++
++ sema_init(&dev->sem, 0);
++
++ retval = mtd->erase(mtd, &ei);
++
++ if (retval == 0)
++ return YAFFS_OK;
++ else
++ return YAFFS_FAIL;
++}
++
++int nandmtd_InitialiseNAND(yaffs_Device * dev)
++{
++ return YAFFS_OK;
++}
++
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_mtdif.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_mtdif.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,27 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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"
++
++int nandmtd_WriteChunkToNAND(yaffs_Device * dev, int chunkInNAND,
++ const __u8 * data, const yaffs_Spare * spare);
++int nandmtd_ReadChunkFromNAND(yaffs_Device * dev, int chunkInNAND, __u8 * data,
++ yaffs_Spare * spare);
++int nandmtd_EraseBlockInNAND(yaffs_Device * dev, int blockNumber);
++int nandmtd_InitialiseNAND(yaffs_Device * dev);
++#endif
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_mtdif2.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_mtdif2.c 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,232 @@
++/*
++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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.
++ */
++
++/* mtd interface for YAFFS2 */
++
++const char *yaffs_mtdif2_c_version =
++ "$Id: yaffs_mtdif2.c,v 1.17 2007/02/14 01:09:06 wookey Exp $";
++
++#include "yportenv.h"
++
++
++#include "yaffs_mtdif2.h"
++
++#include "linux/mtd/mtd.h"
++#include "linux/types.h"
++#include "linux/time.h"
++
++#include "yaffs_packedtags2.h"
++
++int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,
++ const __u8 * data,
++ const yaffs_ExtendedTags * tags)
++{
++ struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ struct mtd_oob_ops ops;
++#else
++ size_t dummy;
++#endif
++ int retval = 0;
++
++ loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
++
++ yaffs_PackedTags2 pt;
++
++ T(YAFFS_TRACE_MTD,
++ (TSTR
++ ("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"
++ TENDSTR), chunkInNAND, data, tags));
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ if (tags)
++ yaffs_PackTags2(&pt, tags);
++ else
++ BUG(); /* both tags and data should always be present */
++
++ if (data) {
++ ops.mode = MTD_OOB_AUTO;
++ ops.ooblen = sizeof(pt);
++ ops.len = dev->nDataBytesPerChunk;
++ ops.ooboffs = 0;
++ ops.datbuf = (__u8 *)data;
++ ops.oobbuf = (void *)&pt;
++ retval = mtd->write_oob(mtd, addr, &ops);
++ } else
++ BUG(); /* both tags and data should always be present */
++#else
++ if (tags) {
++ yaffs_PackTags2(&pt, tags);
++ }
++
++ if (data && tags) {
++ if (dev->useNANDECC)
++ retval =
++ mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
++ &dummy, data, (__u8 *) & pt, NULL);
++ else
++ retval =
++ mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
++ &dummy, data, (__u8 *) & pt, NULL);
++ } else {
++ if (data)
++ retval =
++ mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
++ data);
++ if (tags)
++ retval =
++ mtd->write_oob(mtd, addr, mtd->oobsize, &dummy,
++ (__u8 *) & pt);
++
++ }
++#endif
++
++ if (retval == 0)
++ return YAFFS_OK;
++ else
++ return YAFFS_FAIL;
++}
++
++int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
++ __u8 * data, yaffs_ExtendedTags * tags)
++{
++ struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ struct mtd_oob_ops ops;
++#endif
++ size_t dummy;
++ int retval = 0;
++
++ loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
++
++ yaffs_PackedTags2 pt;
++
++ T(YAFFS_TRACE_MTD,
++ (TSTR
++ ("nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p"
++ TENDSTR), chunkInNAND, data, tags));
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++ if (data && !tags)
++ retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
++ &dummy, data);
++ else if (tags) {
++ ops.mode = MTD_OOB_AUTO;
++ ops.ooblen = sizeof(pt);
++ ops.len = data ? dev->nDataBytesPerChunk : sizeof(pt);
++ ops.ooboffs = 0;
++ ops.datbuf = data;
++ ops.oobbuf = dev->spareBuffer;
++ retval = mtd->read_oob(mtd, addr, &ops);
++ }
++#else
++ if (data && tags) {
++ if (dev->useNANDECC) {
++ retval =
++ mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
++ &dummy, data, dev->spareBuffer,
++ NULL);
++ } else {
++ retval =
++ mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
++ &dummy, data, dev->spareBuffer,
++ NULL);
++ }
++ } else {
++ if (data)
++ retval =
++ mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
++ data);
++ if (tags)
++ retval =
++ mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,
++ dev->spareBuffer);
++ }
++#endif
++
++ memcpy(&pt, dev->spareBuffer, sizeof(pt));
++
++ if (tags)
++ yaffs_UnpackTags2(tags, &pt);
++
++ if(tags && retval == -EBADMSG && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR)
++ tags->eccResult = YAFFS_ECC_RESULT_UNFIXED;
++
++ if (retval == 0)
++ return YAFFS_OK;
++ else
++ return YAFFS_FAIL;
++}
++
++int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
++{
++ struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
++ int retval;
++ T(YAFFS_TRACE_MTD,
++ (TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), blockNo));
++
++ retval =
++ mtd->block_markbad(mtd,
++ blockNo * dev->nChunksPerBlock *
++ dev->nDataBytesPerChunk);
++
++ if (retval == 0)
++ return YAFFS_OK;
++ else
++ return YAFFS_FAIL;
++
++}
++
++int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
++ yaffs_BlockState * state, int *sequenceNumber)
++{
++ struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
++ int retval;
++
++ T(YAFFS_TRACE_MTD,
++ (TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR), blockNo));
++ retval =
++ mtd->block_isbad(mtd,
++ blockNo * dev->nChunksPerBlock *
++ dev->nDataBytesPerChunk);
++
++ if (retval) {
++ T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
++
++ *state = YAFFS_BLOCK_STATE_DEAD;
++ *sequenceNumber = 0;
++ } else {
++ yaffs_ExtendedTags t;
++ nandmtd2_ReadChunkWithTagsFromNAND(dev,
++ blockNo *
++ dev->nChunksPerBlock, NULL,
++ &t);
++
++ if (t.chunkUsed) {
++ *sequenceNumber = t.sequenceNumber;
++ *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
++ } else {
++ *sequenceNumber = 0;
++ *state = YAFFS_BLOCK_STATE_EMPTY;
++ }
++ }
++ T(YAFFS_TRACE_MTD,
++ (TSTR("block is bad seq %d state %d" TENDSTR), *sequenceNumber,
++ *state));
++
++ if (retval == 0)
++ return YAFFS_OK;
++ else
++ return YAFFS_FAIL;
++}
++
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_mtdif2.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_mtdif2.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,29 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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_MTDIF2_H__
++#define __YAFFS_MTDIF2_H__
++
++#include "yaffs_guts.h"
++int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,
++ const __u8 * data,
++ const yaffs_ExtendedTags * tags);
++int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
++ __u8 * data, yaffs_ExtendedTags * tags);
++int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);
++int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
++ yaffs_BlockState * state, int *sequenceNumber);
++
++#endif
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_nand.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_nand.c 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,134 @@
++/*
++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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.
++ */
++
++const char *yaffs_nand_c_version =
++ "$Id: yaffs_nand.c,v 1.7 2007/02/14 01:09:06 wookey Exp $";
++
++#include "yaffs_nand.h"
++#include "yaffs_tagscompat.h"
++#include "yaffs_tagsvalidity.h"
++
++
++int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
++ __u8 * buffer,
++ yaffs_ExtendedTags * tags)
++{
++ int result;
++ yaffs_ExtendedTags localTags;
++
++ int realignedChunkInNAND = chunkInNAND - dev->chunkOffset;
++
++ /* If there are no tags provided, use local tags to get prioritised gc working */
++ if(!tags)
++ tags = &localTags;
++
++ if (dev->readChunkWithTagsFromNAND)
++ result = dev->readChunkWithTagsFromNAND(dev, realignedChunkInNAND, buffer,
++ tags);
++ else
++ result = yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,
++ realignedChunkInNAND,
++ buffer,
++ tags);
++ if(tags &&
++ tags->eccResult > YAFFS_ECC_RESULT_NO_ERROR){
++
++ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, chunkInNAND/dev->nChunksPerBlock);
++ yaffs_HandleChunkError(dev,bi);
++ }
++
++ return result;
++}
++
++int yaffs_WriteChunkWithTagsToNAND(yaffs_Device * dev,
++ int chunkInNAND,
++ const __u8 * buffer,
++ yaffs_ExtendedTags * tags)
++{
++ chunkInNAND -= dev->chunkOffset;
++
++
++ if (tags) {
++ tags->sequenceNumber = dev->sequenceNumber;
++ tags->chunkUsed = 1;
++ if (!yaffs_ValidateTags(tags)) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR("Writing uninitialised tags" TENDSTR)));
++ YBUG();
++ }
++ T(YAFFS_TRACE_WRITE,
++ (TSTR("Writing chunk %d tags %d %d" TENDSTR), chunkInNAND,
++ tags->objectId, tags->chunkId));
++ } else {
++ T(YAFFS_TRACE_ERROR, (TSTR("Writing with no tags" TENDSTR)));
++ YBUG();
++ }
++
++ if (dev->writeChunkWithTagsToNAND)
++ return dev->writeChunkWithTagsToNAND(dev, chunkInNAND, buffer,
++ tags);
++ else
++ return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,
++ chunkInNAND,
++ buffer,
++ tags);
++}
++
++int yaffs_MarkBlockBad(yaffs_Device * dev, int blockNo)
++{
++ blockNo -= dev->blockOffset;
++
++;
++ if (dev->markNANDBlockBad)
++ return dev->markNANDBlockBad(dev, blockNo);
++ else
++ return yaffs_TagsCompatabilityMarkNANDBlockBad(dev, blockNo);
++}
++
++int yaffs_QueryInitialBlockState(yaffs_Device * dev,
++ int blockNo,
++ yaffs_BlockState * state,
++ unsigned *sequenceNumber)
++{
++ blockNo -= dev->blockOffset;
++
++ if (dev->queryNANDBlock)
++ return dev->queryNANDBlock(dev, blockNo, state, sequenceNumber);
++ else
++ return yaffs_TagsCompatabilityQueryNANDBlock(dev, blockNo,
++ state,
++ sequenceNumber);
++}
++
++
++int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
++ int blockInNAND)
++{
++ int result;
++
++ blockInNAND -= dev->blockOffset;
++
++
++ dev->nBlockErasures++;
++ result = dev->eraseBlockInNAND(dev, blockInNAND);
++
++ return result;
++}
++
++int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
++{
++ return dev->initialiseNAND(dev);
++}
++
++
++
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_nand.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_nand.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,44 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
++ __u8 * buffer,
++ yaffs_ExtendedTags * tags);
++
++int yaffs_WriteChunkWithTagsToNAND(yaffs_Device * dev,
++ int chunkInNAND,
++ const __u8 * buffer,
++ yaffs_ExtendedTags * tags);
++
++int yaffs_MarkBlockBad(yaffs_Device * dev, int blockNo);
++
++int yaffs_QueryInitialBlockState(yaffs_Device * dev,
++ int blockNo,
++ yaffs_BlockState * state,
++ unsigned *sequenceNumber);
++
++int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
++ int blockInNAND);
++
++int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev);
++
++#endif
++
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_nandemul2k.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_nandemul2k.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,39 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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.
++ */
++
++/* Interface to emulated NAND functions (2k page size) */
++
++#ifndef __YAFFS_NANDEMUL2K_H__
++#define __YAFFS_NANDEMUL2K_H__
++
++#include "yaffs_guts.h"
++
++int nandemul2k_WriteChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
++ int chunkInNAND, const __u8 * data,
++ yaffs_ExtendedTags * tags);
++int nandemul2k_ReadChunkWithTagsFromNAND(struct yaffs_DeviceStruct *dev,
++ int chunkInNAND, __u8 * data,
++ yaffs_ExtendedTags * tags);
++int nandemul2k_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);
++int nandemul2k_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
++ yaffs_BlockState * state, int *sequenceNumber);
++int nandemul2k_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
++ int blockInNAND);
++int nandemul2k_InitialiseNAND(struct yaffs_DeviceStruct *dev);
++int nandemul2k_GetBytesPerChunk(void);
++int nandemul2k_GetChunksPerBlock(void);
++int nandemul2k_GetNumberOfBlocks(void);
++
++#endif
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_packedtags1.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_packedtags1.c 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,52 @@
++/*
++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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"
++
++void yaffs_PackTags1(yaffs_PackedTags1 * pt, const yaffs_ExtendedTags * t)
++{
++ pt->chunkId = t->chunkId;
++ pt->serialNumber = t->serialNumber;
++ pt->byteCount = t->byteCount;
++ pt->objectId = t->objectId;
++ pt->ecc = 0;
++ pt->deleted = (t->chunkDeleted) ? 0 : 1;
++ pt->unusedStuff = 0;
++ pt->shouldBeFF = 0xFFFFFFFF;
++
++}
++
++void yaffs_UnpackTags1(yaffs_ExtendedTags * t, const yaffs_PackedTags1 * pt)
++{
++ static const __u8 allFF[] =
++ { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
++0xff };
++
++ if (memcmp(allFF, pt, sizeof(yaffs_PackedTags1))) {
++ t->blockBad = 0;
++ if (pt->shouldBeFF != 0xFFFFFFFF) {
++ t->blockBad = 1;
++ }
++ t->chunkUsed = 1;
++ t->objectId = pt->objectId;
++ t->chunkId = pt->chunkId;
++ t->byteCount = pt->byteCount;
++ t->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
++ t->chunkDeleted = (pt->deleted) ? 0 : 1;
++ t->serialNumber = pt->serialNumber;
++ } else {
++ memset(t, 0, sizeof(yaffs_ExtendedTags));
++
++ }
++}
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_packedtags1.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_packedtags1.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,37 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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"
++
++typedef struct {
++ unsigned chunkId:20;
++ unsigned serialNumber:2;
++ unsigned byteCount:10;
++ unsigned objectId:18;
++ unsigned ecc:12;
++ unsigned deleted:1;
++ unsigned unusedStuff:1;
++ unsigned shouldBeFF;
++
++} yaffs_PackedTags1;
++
++void yaffs_PackTags1(yaffs_PackedTags1 * pt, const yaffs_ExtendedTags * t);
++void yaffs_UnpackTags1(yaffs_ExtendedTags * t, const yaffs_PackedTags1 * pt);
++#endif
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_packedtags2.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_packedtags2.c 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,182 @@
++/*
++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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_tagsvalidity.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 chunkId */
++
++#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_DumpPackedTags2(const yaffs_PackedTags2 * pt)
++{
++ T(YAFFS_TRACE_MTD,
++ (TSTR("packed tags obj %d chunk %d byte %d seq %d" TENDSTR),
++ pt->t.objectId, pt->t.chunkId, pt->t.byteCount,
++ pt->t.sequenceNumber));
++}
++
++static void yaffs_DumpTags2(const yaffs_ExtendedTags * t)
++{
++ T(YAFFS_TRACE_MTD,
++ (TSTR
++ ("ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte "
++ "%d del %d ser %d seq %d"
++ TENDSTR), t->eccResult, t->blockBad, t->chunkUsed, t->objectId,
++ t->chunkId, t->byteCount, t->chunkDeleted, t->serialNumber,
++ t->sequenceNumber));
++
++}
++
++void yaffs_PackTags2(yaffs_PackedTags2 * pt, const yaffs_ExtendedTags * t)
++{
++ pt->t.chunkId = t->chunkId;
++ pt->t.sequenceNumber = t->sequenceNumber;
++ pt->t.byteCount = t->byteCount;
++ pt->t.objectId = t->objectId;
++
++ if (t->chunkId == 0 && t->extraHeaderInfoAvailable) {
++ /* Store the extra header info instead */
++ /* We save the parent object in the chunkId */
++ pt->t.chunkId = EXTRA_HEADER_INFO_FLAG
++ | t->extraParentObjectId;
++ if (t->extraIsShrinkHeader) {
++ pt->t.chunkId |= EXTRA_SHRINK_FLAG;
++ }
++ if (t->extraShadows) {
++ pt->t.chunkId |= EXTRA_SHADOWS_FLAG;
++ }
++
++ pt->t.objectId &= ~EXTRA_OBJECT_TYPE_MASK;
++ pt->t.objectId |=
++ (t->extraObjectType << EXTRA_OBJECT_TYPE_SHIFT);
++
++ if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK) {
++ pt->t.byteCount = t->extraEquivalentObjectId;
++ } else if (t->extraObjectType == YAFFS_OBJECT_TYPE_FILE) {
++ pt->t.byteCount = t->extraFileLength;
++ } else {
++ pt->t.byteCount = 0;
++ }
++ }
++
++ yaffs_DumpPackedTags2(pt);
++ yaffs_DumpTags2(t);
++
++#ifndef YAFFS_IGNORE_TAGS_ECC
++ {
++ yaffs_ECCCalculateOther((unsigned char *)&pt->t,
++ sizeof(yaffs_PackedTags2TagsPart),
++ &pt->ecc);
++ }
++#endif
++}
++
++void yaffs_UnpackTags2(yaffs_ExtendedTags * t, yaffs_PackedTags2 * pt)
++{
++
++ memset(t, 0, sizeof(yaffs_ExtendedTags));
++
++ yaffs_InitialiseTags(t);
++
++ if (pt->t.sequenceNumber != 0xFFFFFFFF) {
++ /* Page is in use */
++#ifdef YAFFS_IGNORE_TAGS_ECC
++ {
++ t->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
++ }
++#else
++ {
++ yaffs_ECCOther ecc;
++ int result;
++ yaffs_ECCCalculateOther((unsigned char *)&pt->t,
++ sizeof
++ (yaffs_PackedTags2TagsPart),
++ &ecc);
++ result =
++ yaffs_ECCCorrectOther((unsigned char *)&pt->t,
++ sizeof
++ (yaffs_PackedTags2TagsPart),
++ &pt->ecc, &ecc);
++ switch(result){
++ case 0:
++ t->eccResult = YAFFS_ECC_RESULT_NO_ERROR;
++ break;
++ case 1:
++ t->eccResult = YAFFS_ECC_RESULT_FIXED;
++ break;
++ case -1:
++ t->eccResult = YAFFS_ECC_RESULT_UNFIXED;
++ break;
++ default:
++ t->eccResult = YAFFS_ECC_RESULT_UNKNOWN;
++ }
++ }
++#endif
++ t->blockBad = 0;
++ t->chunkUsed = 1;
++ t->objectId = pt->t.objectId;
++ t->chunkId = pt->t.chunkId;
++ t->byteCount = pt->t.byteCount;
++ t->chunkDeleted = 0;
++ t->serialNumber = 0;
++ t->sequenceNumber = pt->t.sequenceNumber;
++
++ /* Do extra header info stuff */
++
++ if (pt->t.chunkId & EXTRA_HEADER_INFO_FLAG) {
++ t->chunkId = 0;
++ t->byteCount = 0;
++
++ t->extraHeaderInfoAvailable = 1;
++ t->extraParentObjectId =
++ pt->t.chunkId & (~(ALL_EXTRA_FLAGS));
++ t->extraIsShrinkHeader =
++ (pt->t.chunkId & EXTRA_SHRINK_FLAG) ? 1 : 0;
++ t->extraShadows =
++ (pt->t.chunkId & EXTRA_SHADOWS_FLAG) ? 1 : 0;
++ t->extraObjectType =
++ pt->t.objectId >> EXTRA_OBJECT_TYPE_SHIFT;
++ t->objectId &= ~EXTRA_OBJECT_TYPE_MASK;
++
++ if (t->extraObjectType == YAFFS_OBJECT_TYPE_HARDLINK) {
++ t->extraEquivalentObjectId = pt->t.byteCount;
++ } else {
++ t->extraFileLength = pt->t.byteCount;
++ }
++ }
++ }
++
++ yaffs_DumpPackedTags2(pt);
++ yaffs_DumpTags2(t);
++
++}
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_packedtags2.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_packedtags2.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,38 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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"
++
++typedef struct {
++ unsigned sequenceNumber;
++ unsigned objectId;
++ unsigned chunkId;
++ unsigned byteCount;
++} yaffs_PackedTags2TagsPart;
++
++typedef struct {
++ yaffs_PackedTags2TagsPart t;
++ yaffs_ECCOther ecc;
++} yaffs_PackedTags2;
++
++void yaffs_PackTags2(yaffs_PackedTags2 * pt, const yaffs_ExtendedTags * t);
++void yaffs_UnpackTags2(yaffs_ExtendedTags * t, yaffs_PackedTags2 * pt);
++#endif
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_qsort.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_qsort.c 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,156 @@
++/*
++ * Copyright (c) 1992, 1993
++ * The Regents of the University of California. All rights reserved.
++ *
++ * Redistribution and use in source and binary forms, with or without
++ * modification, are permitted provided that the following conditions
++ * are met:
++ * 1. Redistributions of source code must retain the above copyright
++ * notice, this list of conditions and the following disclaimer.
++ * 2. Redistributions in binary form must reproduce the above copyright
++ * notice, this list of conditions and the following disclaimer in the
++ * documentation and/or other materials provided with the distribution.
++ * 3. Neither the name of the University nor the names of its contributors
++ * may be used to endorse or promote products derived from this software
++ * without specific prior written permission.
++ *
++ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
++ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
++ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
++ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
++ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
++ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
++ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
++ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
++ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
++ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
++ * SUCH DAMAGE.
++ */
++
++#include "yportenv.h"
++//#include <linux/string.h>
++
++/*
++ * Qsort routine from Bentley & McIlroy's "Engineering a Sort Function".
++ */
++#define swapcode(TYPE, parmi, parmj, n) { \
++ long i = (n) / sizeof (TYPE); \
++ register TYPE *pi = (TYPE *) (parmi); \
++ register TYPE *pj = (TYPE *) (parmj); \
++ do { \
++ register TYPE t = *pi; \
++ *pi++ = *pj; \
++ *pj++ = t; \
++ } while (--i > 0); \
++}
++
++#define SWAPINIT(a, es) swaptype = ((char *)a - (char *)0) % sizeof(long) || \
++ es % sizeof(long) ? 2 : es == sizeof(long)? 0 : 1;
++
++static __inline void
++swapfunc(char *a, char *b, int n, int swaptype)
++{
++ if (swaptype <= 1)
++ swapcode(long, a, b, n)
++ else
++ swapcode(char, a, b, n)
++}
++
++#define swap(a, b) \
++ if (swaptype == 0) { \
++ long t = *(long *)(a); \
++ *(long *)(a) = *(long *)(b); \
++ *(long *)(b) = t; \
++ } else \
++ swapfunc(a, b, es, swaptype)
++
++#define vecswap(a, b, n) if ((n) > 0) swapfunc(a, b, n, swaptype)
++
++static __inline char *
++med3(char *a, char *b, char *c, int (*cmp)(const void *, const void *))
++{
++ return cmp(a, b) < 0 ?
++ (cmp(b, c) < 0 ? b : (cmp(a, c) < 0 ? c : a ))
++ :(cmp(b, c) > 0 ? b : (cmp(a, c) < 0 ? a : c ));
++}
++
++#define min(a,b) (((a) < (b)) ? (a) : (b))
++void
++qsort(void *aa, size_t n, size_t es, int (*cmp)(const void *, const void *))
++{
++ char *pa, *pb, *pc, *pd, *pl, *pm, *pn;
++ int d, r, swaptype, swap_cnt;
++ register char *a = aa;
++
++loop: SWAPINIT(a, es);
++ swap_cnt = 0;
++ if (n < 7) {
++ for (pm = (char *)a + es; pm < (char *) a + n * es; pm += es)
++ for (pl = pm; pl > (char *) a && cmp(pl - es, pl) > 0;
++ pl -= es)
++ swap(pl, pl - es);
++ return;
++ }
++ pm = (char *)a + (n / 2) * es;
++ if (n > 7) {
++ pl = (char *)a;
++ pn = (char *)a + (n - 1) * es;
++ if (n > 40) {
++ d = (n / 8) * es;
++ pl = med3(pl, pl + d, pl + 2 * d, cmp);
++ pm = med3(pm - d, pm, pm + d, cmp);
++ pn = med3(pn - 2 * d, pn - d, pn, cmp);
++ }
++ pm = med3(pl, pm, pn, cmp);
++ }
++ swap(a, pm);
++ pa = pb = (char *)a + es;
++
++ pc = pd = (char *)a + (n - 1) * es;
++ for (;;) {
++ while (pb <= pc && (r = cmp(pb, a)) <= 0) {
++ if (r == 0) {
++ swap_cnt = 1;
++ swap(pa, pb);
++ pa += es;
++ }
++ pb += es;
++ }
++ while (pb <= pc && (r = cmp(pc, a)) >= 0) {
++ if (r == 0) {
++ swap_cnt = 1;
++ swap(pc, pd);
++ pd -= es;
++ }
++ pc -= es;
++ }
++ if (pb > pc)
++ break;
++ swap(pb, pc);
++ swap_cnt = 1;
++ pb += es;
++ pc -= es;
++ }
++ if (swap_cnt == 0) { /* Switch to insertion sort */
++ for (pm = (char *) a + es; pm < (char *) a + n * es; pm += es)
++ for (pl = pm; pl > (char *) a && cmp(pl - es, pl) > 0;
++ pl -= es)
++ swap(pl, pl - es);
++ return;
++ }
++
++ pn = (char *)a + n * es;
++ r = min(pa - (char *)a, pb - pa);
++ vecswap(a, pb - r, r);
++ r = min((long)(pd - pc), (long)(pn - pd - es));
++ vecswap(pb, pn - r, r);
++ if ((r = pb - pa) > es)
++ qsort(a, r / es, es, cmp);
++ if ((r = pd - pc) > es) {
++ /* Iterate rather than recurse to save stack space */
++ a = pn - r;
++ n = r / es;
++ goto loop;
++ }
++/* qsort(pn - r, r / es, es, cmp);*/
++}
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_qsort.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_qsort.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,23 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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_QSORT_H__
++#define __YAFFS_QSORT_H__
++
++extern void qsort (void *const base, size_t total_elems, size_t size,
++ int (*cmp)(const void *, const void *));
++
++#endif
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_tagscompat.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_tagscompat.c 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,530 @@
++/*
++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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_tagscompat.h"
++#include "yaffs_ecc.h"
++
++static void yaffs_HandleReadDataError(yaffs_Device * dev, int chunkInNAND);
++#ifdef NOTYET
++static void yaffs_CheckWrittenBlock(yaffs_Device * dev, int chunkInNAND);
++static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
++ const __u8 * data,
++ const yaffs_Spare * spare);
++static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
++ const yaffs_Spare * spare);
++static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND);
++#endif
++
++static const char yaffs_countBitsTable[256] = {
++ 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
++ 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
++ 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
++ 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
++ 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
++ 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
++ 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
++ 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
++ 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
++ 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
++ 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
++ 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
++ 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
++ 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
++ 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
++ 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
++};
++
++static int yaffs_CountBits(__u8 x)
++{
++ int retVal;
++ retVal = yaffs_countBitsTable[x];
++ return retVal;
++}
++
++/********** Tags ECC calculations *********/
++
++void yaffs_CalcECC(const __u8 * data, yaffs_Spare * spare)
++{
++ yaffs_ECCCalculate(data, spare->ecc1);
++ yaffs_ECCCalculate(&data[256], spare->ecc2);
++}
++
++void yaffs_CalcTagsECC(yaffs_Tags * tags)
++{
++ /* Calculate an ecc */
++
++ unsigned char *b = ((yaffs_TagsUnion *) tags)->asBytes;
++ 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_CheckECCOnTags(yaffs_Tags * tags)
++{
++ unsigned ecc = tags->ecc;
++
++ yaffs_CalcTagsECC(tags);
++
++ ecc ^= tags->ecc;
++
++ if (ecc && ecc <= 64) {
++ /* TODO: Handle the failure better. Retire? */
++ unsigned char *b = ((yaffs_TagsUnion *) tags)->asBytes;
++
++ ecc--;
++
++ b[ecc / 8] ^= (1 << (ecc & 7));
++
++ /* Now recvalc the ecc */
++ yaffs_CalcTagsECC(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 **********/
++
++static void yaffs_LoadTagsIntoSpare(yaffs_Spare * sparePtr,
++ yaffs_Tags * tagsPtr)
++{
++ yaffs_TagsUnion *tu = (yaffs_TagsUnion *) tagsPtr;
++
++ yaffs_CalcTagsECC(tagsPtr);
++
++ sparePtr->tagByte0 = tu->asBytes[0];
++ sparePtr->tagByte1 = tu->asBytes[1];
++ sparePtr->tagByte2 = tu->asBytes[2];
++ sparePtr->tagByte3 = tu->asBytes[3];
++ sparePtr->tagByte4 = tu->asBytes[4];
++ sparePtr->tagByte5 = tu->asBytes[5];
++ sparePtr->tagByte6 = tu->asBytes[6];
++ sparePtr->tagByte7 = tu->asBytes[7];
++}
++
++static void yaffs_GetTagsFromSpare(yaffs_Device * dev, yaffs_Spare * sparePtr,
++ yaffs_Tags * tagsPtr)
++{
++ yaffs_TagsUnion *tu = (yaffs_TagsUnion *) tagsPtr;
++ int result;
++
++ tu->asBytes[0] = sparePtr->tagByte0;
++ tu->asBytes[1] = sparePtr->tagByte1;
++ tu->asBytes[2] = sparePtr->tagByte2;
++ tu->asBytes[3] = sparePtr->tagByte3;
++ tu->asBytes[4] = sparePtr->tagByte4;
++ tu->asBytes[5] = sparePtr->tagByte5;
++ tu->asBytes[6] = sparePtr->tagByte6;
++ tu->asBytes[7] = sparePtr->tagByte7;
++
++ result = yaffs_CheckECCOnTags(tagsPtr);
++ if (result > 0) {
++ dev->tagsEccFixed++;
++ } else if (result < 0) {
++ dev->tagsEccUnfixed++;
++ }
++}
++
++static void yaffs_SpareInitialise(yaffs_Spare * spare)
++{
++ memset(spare, 0xFF, sizeof(yaffs_Spare));
++}
++
++static int yaffs_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,
++ int chunkInNAND, const __u8 * data,
++ yaffs_Spare * spare)
++{
++ if (chunkInNAND < dev->startBlock * dev->nChunksPerBlock) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR("**>> yaffs chunk %d is not valid" TENDSTR),
++ chunkInNAND));
++ return YAFFS_FAIL;
++ }
++
++ dev->nPageWrites++;
++ return dev->writeChunkToNAND(dev, chunkInNAND, data, spare);
++}
++
++static int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,
++ int chunkInNAND,
++ __u8 * data,
++ yaffs_Spare * spare,
++ yaffs_ECCResult * eccResult,
++ int doErrorCorrection)
++{
++ int retVal;
++ yaffs_Spare localSpare;
++
++ dev->nPageReads++;
++
++ if (!spare && data) {
++ /* If we don't have a real spare, then we use a local one. */
++ /* Need this for the calculation of the ecc */
++ spare = &localSpare;
++ }
++
++ if (!dev->useNANDECC) {
++ retVal = dev->readChunkFromNAND(dev, chunkInNAND, data, spare);
++ if (data && doErrorCorrection) {
++ /* Do ECC correction */
++ /* Todo handle any errors */
++ int eccResult1, eccResult2;
++ __u8 calcEcc[3];
++
++ yaffs_ECCCalculate(data, calcEcc);
++ eccResult1 =
++ yaffs_ECCCorrect(data, spare->ecc1, calcEcc);
++ yaffs_ECCCalculate(&data[256], calcEcc);
++ eccResult2 =
++ yaffs_ECCCorrect(&data[256], spare->ecc2, calcEcc);
++
++ if (eccResult1 > 0) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("**>>yaffs ecc error fix performed on chunk %d:0"
++ TENDSTR), chunkInNAND));
++ dev->eccFixed++;
++ } else if (eccResult1 < 0) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("**>>yaffs ecc error unfixed on chunk %d:0"
++ TENDSTR), chunkInNAND));
++ dev->eccUnfixed++;
++ }
++
++ if (eccResult2 > 0) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("**>>yaffs ecc error fix performed on chunk %d:1"
++ TENDSTR), chunkInNAND));
++ dev->eccFixed++;
++ } else if (eccResult2 < 0) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("**>>yaffs ecc error unfixed on chunk %d:1"
++ TENDSTR), chunkInNAND));
++ dev->eccUnfixed++;
++ }
++
++ if (eccResult1 || eccResult2) {
++ /* We had a data problem on this page */
++ yaffs_HandleReadDataError(dev, chunkInNAND);
++ }
++
++ if (eccResult1 < 0 || eccResult2 < 0)
++ *eccResult = YAFFS_ECC_RESULT_UNFIXED;
++ else if (eccResult1 > 0 || eccResult2 > 0)
++ *eccResult = YAFFS_ECC_RESULT_FIXED;
++ else
++ *eccResult = YAFFS_ECC_RESULT_NO_ERROR;
++ }
++ } else {
++ /* Must allocate enough memory for spare+2*sizeof(int) */
++ /* for ecc results from device. */
++ struct yaffs_NANDSpare nspare;
++ retVal =
++ dev->readChunkFromNAND(dev, chunkInNAND, data,
++ (yaffs_Spare *) & nspare);
++ memcpy(spare, &nspare, sizeof(yaffs_Spare));
++ if (data && doErrorCorrection) {
++ if (nspare.eccres1 > 0) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("**>>mtd ecc error fix performed on chunk %d:0"
++ TENDSTR), chunkInNAND));
++ } else if (nspare.eccres1 < 0) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("**>>mtd ecc error unfixed on chunk %d:0"
++ TENDSTR), chunkInNAND));
++ }
++
++ if (nspare.eccres2 > 0) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("**>>mtd ecc error fix performed on chunk %d:1"
++ TENDSTR), chunkInNAND));
++ } else if (nspare.eccres2 < 0) {
++ T(YAFFS_TRACE_ERROR,
++ (TSTR
++ ("**>>mtd ecc error unfixed on chunk %d:1"
++ TENDSTR), chunkInNAND));
++ }
++
++ if (nspare.eccres1 || nspare.eccres2) {
++ /* We had a data problem on this page */
++ yaffs_HandleReadDataError(dev, chunkInNAND);
++ }
++
++ if (nspare.eccres1 < 0 || nspare.eccres2 < 0)
++ *eccResult = YAFFS_ECC_RESULT_UNFIXED;
++ else if (nspare.eccres1 > 0 || nspare.eccres2 > 0)
++ *eccResult = YAFFS_ECC_RESULT_FIXED;
++ else
++ *eccResult = YAFFS_ECC_RESULT_NO_ERROR;
++
++ }
++ }
++ return retVal;
++}
++
++#ifdef NOTYET
++static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
++ int chunkInNAND)
++{
++
++ static int init = 0;
++ static __u8 cmpbuf[YAFFS_BYTES_PER_CHUNK];
++ static __u8 data[YAFFS_BYTES_PER_CHUNK];
++ /* Might as well always allocate the larger size for */
++ /* dev->useNANDECC == true; */
++ static __u8 spare[sizeof(struct yaffs_NANDSpare)];
++
++ dev->readChunkFromNAND(dev, chunkInNAND, data, (yaffs_Spare *) spare);
++
++ if (!init) {
++ memset(cmpbuf, 0xff, YAFFS_BYTES_PER_CHUNK);
++ init = 1;
++ }
++
++ if (memcmp(cmpbuf, data, YAFFS_BYTES_PER_CHUNK))
++ return YAFFS_FAIL;
++ if (memcmp(cmpbuf, spare, 16))
++ return YAFFS_FAIL;
++
++ return YAFFS_OK;
++
++}
++#endif
++
++/*
++ * Functions for robustisizing
++ */
++
++static void yaffs_HandleReadDataError(yaffs_Device * dev, int chunkInNAND)
++{
++ int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
++
++ /* Mark the block for retirement */
++ yaffs_GetBlockInfo(dev, blockInNAND)->needsRetiring = 1;
++ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
++ (TSTR("**>>Block %d marked for retirement" TENDSTR), blockInNAND));
++
++ /* TODO:
++ * Just do a garbage collection on the affected block
++ * then retire the block
++ * NB recursion
++ */
++}
++
++#ifdef NOTYET
++static void yaffs_CheckWrittenBlock(yaffs_Device * dev, int chunkInNAND)
++{
++}
++
++static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
++ const __u8 * data,
++ const yaffs_Spare * spare)
++{
++}
++
++static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
++ const yaffs_Spare * spare)
++{
++}
++
++static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND)
++{
++ int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
++
++ /* Mark the block for retirement */
++ yaffs_GetBlockInfo(dev, blockInNAND)->needsRetiring = 1;
++ /* Delete the chunk */
++ yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
++}
++
++static int yaffs_VerifyCompare(const __u8 * d0, const __u8 * d1,
++ const yaffs_Spare * s0, const yaffs_Spare * s1)
++{
++
++ if (memcmp(d0, d1, YAFFS_BYTES_PER_CHUNK) != 0 ||
++ s0->tagByte0 != s1->tagByte0 ||
++ s0->tagByte1 != s1->tagByte1 ||
++ s0->tagByte2 != s1->tagByte2 ||
++ s0->tagByte3 != s1->tagByte3 ||
++ s0->tagByte4 != s1->tagByte4 ||
++ s0->tagByte5 != s1->tagByte5 ||
++ s0->tagByte6 != s1->tagByte6 ||
++ s0->tagByte7 != s1->tagByte7 ||
++ s0->ecc1[0] != s1->ecc1[0] ||
++ s0->ecc1[1] != s1->ecc1[1] ||
++ s0->ecc1[2] != s1->ecc1[2] ||
++ s0->ecc2[0] != s1->ecc2[0] ||
++ s0->ecc2[1] != s1->ecc2[1] || s0->ecc2[2] != s1->ecc2[2]) {
++ return 0;
++ }
++
++ return 1;
++}
++#endif /* NOTYET */
++
++int yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(yaffs_Device * dev,
++ int chunkInNAND,
++ const __u8 * data,
++ const yaffs_ExtendedTags *
++ eTags)
++{
++ yaffs_Spare spare;
++ yaffs_Tags tags;
++
++ yaffs_SpareInitialise(&spare);
++
++ if (eTags->chunkDeleted) {
++ spare.pageStatus = 0;
++ } else {
++ tags.objectId = eTags->objectId;
++ tags.chunkId = eTags->chunkId;
++ tags.byteCount = eTags->byteCount;
++ tags.serialNumber = eTags->serialNumber;
++
++ if (!dev->useNANDECC && data) {
++ yaffs_CalcECC(data, &spare);
++ }
++ yaffs_LoadTagsIntoSpare(&spare, &tags);
++
++ }
++
++ return yaffs_WriteChunkToNAND(dev, chunkInNAND, data, &spare);
++}
++
++int yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(yaffs_Device * dev,
++ int chunkInNAND,
++ __u8 * data,
++ yaffs_ExtendedTags * eTags)
++{
++
++ yaffs_Spare spare;
++ yaffs_Tags tags;
++ yaffs_ECCResult eccResult;
++
++ static yaffs_Spare spareFF;
++ static int init;
++
++ if (!init) {
++ memset(&spareFF, 0xFF, sizeof(spareFF));
++ init = 1;
++ }
++
++ if (yaffs_ReadChunkFromNAND
++ (dev, chunkInNAND, data, &spare, &eccResult, 1)) {
++ /* eTags may be NULL */
++ if (eTags) {
++
++ int deleted =
++ (yaffs_CountBits(spare.pageStatus) < 7) ? 1 : 0;
++
++ eTags->chunkDeleted = deleted;
++ eTags->eccResult = eccResult;
++ eTags->blockBad = 0; /* We're reading it */
++ /* therefore it is not a bad block */
++ eTags->chunkUsed =
++ (memcmp(&spareFF, &spare, sizeof(spareFF)) !=
++ 0) ? 1 : 0;
++
++ if (eTags->chunkUsed) {
++ yaffs_GetTagsFromSpare(dev, &spare, &tags);
++
++ eTags->objectId = tags.objectId;
++ eTags->chunkId = tags.chunkId;
++ eTags->byteCount = tags.byteCount;
++ eTags->serialNumber = tags.serialNumber;
++ }
++ }
++
++ return YAFFS_OK;
++ } else {
++ return YAFFS_FAIL;
++ }
++}
++
++int yaffs_TagsCompatabilityMarkNANDBlockBad(struct yaffs_DeviceStruct *dev,
++ int blockInNAND)
++{
++
++ yaffs_Spare spare;
++
++ memset(&spare, 0xff, sizeof(yaffs_Spare));
++
++ spare.blockStatus = 'Y';
++
++ yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock, NULL,
++ &spare);
++ yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock + 1,
++ NULL, &spare);
++
++ return YAFFS_OK;
++
++}
++
++int yaffs_TagsCompatabilityQueryNANDBlock(struct yaffs_DeviceStruct *dev,
++ int blockNo, yaffs_BlockState *
++ state,
++ int *sequenceNumber)
++{
++
++ yaffs_Spare spare0, spare1;
++ static yaffs_Spare spareFF;
++ static int init;
++ yaffs_ECCResult dummy;
++
++ if (!init) {
++ memset(&spareFF, 0xFF, sizeof(spareFF));
++ init = 1;
++ }
++
++ *sequenceNumber = 0;
++
++ yaffs_ReadChunkFromNAND(dev, blockNo * dev->nChunksPerBlock, NULL,
++ &spare0, &dummy, 1);
++ yaffs_ReadChunkFromNAND(dev, blockNo * dev->nChunksPerBlock + 1, NULL,
++ &spare1, &dummy, 1);
++
++ if (yaffs_CountBits(spare0.blockStatus & spare1.blockStatus) < 7)
++ *state = YAFFS_BLOCK_STATE_DEAD;
++ else if (memcmp(&spareFF, &spare0, sizeof(spareFF)) == 0)
++ *state = YAFFS_BLOCK_STATE_EMPTY;
++ else
++ *state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
++
++ return YAFFS_OK;
++}
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_tagscompat.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_tagscompat.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,36 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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"
++int yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(yaffs_Device * dev,
++ int chunkInNAND,
++ const __u8 * data,
++ const yaffs_ExtendedTags *
++ tags);
++int yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(yaffs_Device * dev,
++ int chunkInNAND,
++ __u8 * data,
++ yaffs_ExtendedTags *
++ tags);
++int yaffs_TagsCompatabilityMarkNANDBlockBad(struct yaffs_DeviceStruct *dev,
++ int blockNo);
++int yaffs_TagsCompatabilityQueryNANDBlock(struct yaffs_DeviceStruct *dev,
++ int blockNo, yaffs_BlockState *
++ state, int *sequenceNumber);
++
++#endif
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_tagsvalidity.c
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_tagsvalidity.c 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,28 @@
++/*
++ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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_tagsvalidity.h"
++
++void yaffs_InitialiseTags(yaffs_ExtendedTags * tags)
++{
++ memset(tags, 0, sizeof(yaffs_ExtendedTags));
++ tags->validMarker0 = 0xAAAAAAAA;
++ tags->validMarker1 = 0x55555555;
++}
++
++int yaffs_ValidateTags(yaffs_ExtendedTags * tags)
++{
++ return (tags->validMarker0 == 0xAAAAAAAA &&
++ tags->validMarker1 == 0x55555555);
++
++}
+Index: linux-2.6.20.1/fs/yaffs2/yaffs_tagsvalidity.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffs_tagsvalidity.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,24 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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_TAGS_VALIDITY_H__
++#define __YAFFS_TAGS_VALIDITY_H__
++
++#include "yaffs_guts.h"
++
++void yaffs_InitialiseTags(yaffs_ExtendedTags * tags);
++int yaffs_ValidateTags(yaffs_ExtendedTags * tags);
++#endif
+Index: linux-2.6.20.1/fs/yaffs2/yaffsinterface.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yaffsinterface.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,21 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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 __YAFFSINTERFACE_H__
++#define __YAFFSINTERFACE_H__
++
++int yaffs_Initialise(unsigned nBlocks);
++
++#endif
+Index: linux-2.6.20.1/fs/yaffs2/yportenv.h
+===================================================================
+--- /dev/null 1970-01-01 00:00:00.000000000 +0000
++++ linux-2.6.20.1/fs/yaffs2/yportenv.h 2007-03-04 16:08:19.000000000 +0100
+@@ -0,0 +1,162 @@
++/*
++ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
++ *
++ * Copyright (C) 2002-2007 Aleph One Ltd.
++ * for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * Created by Charles Manning <charles at 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__
++
++#if defined CONFIG_YAFFS_WINCE
++
++#include "ywinceenv.h"
++
++#elif defined __KERNEL__
++
++#include "moduleconfig.h"
++
++/* Linux kernel */
++#include <linux/version.h>
++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19))
++#include <linux/config.h>
++#endif
++#include <linux/kernel.h>
++#include <linux/mm.h>
++#include <linux/string.h>
++#include <linux/slab.h>
++#include <linux/vmalloc.h>
++
++#define YCHAR char
++#define YUCHAR unsigned char
++#define _Y(x) x
++#define yaffs_strcpy(a,b) strcpy(a,b)
++#define yaffs_strncpy(a,b,c) strncpy(a,b,c)
++#define yaffs_strlen(s) strlen(s)
++#define yaffs_sprintf sprintf
++#define yaffs_toupper(a) toupper(a)
++
++#define Y_INLINE inline
++
++#define YAFFS_LOSTNFOUND_NAME "lost+found"
++#define YAFFS_LOSTNFOUND_PREFIX "obj"
++
++/* #define YPRINTF(x) printk x */
++#define YMALLOC(x) kmalloc(x,GFP_KERNEL)
++#define YFREE(x) kfree(x)
++#define YMALLOC_ALT(x) vmalloc(x)
++#define YFREE_ALT(x) vfree(x)
++#define YMALLOC_DMA(x) YMALLOC(x)
++
++// KR - added for use in scan so processes aren't blocked indefinitely.
++#define YYIELD() schedule()
++
++#define YAFFS_ROOT_MODE 0666
++#define YAFFS_LOSTNFOUND_MODE 0666
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
++#define Y_CURRENT_TIME CURRENT_TIME.tv_sec
++#define Y_TIME_CONVERT(x) (x).tv_sec
++#else
++#define Y_CURRENT_TIME CURRENT_TIME
++#define Y_TIME_CONVERT(x) (x)
++#endif
++
++#define yaffs_SumCompare(x,y) ((x) == (y))
++#define yaffs_strcmp(a,b) strcmp(a,b)
++
++#define TENDSTR "\n"
++#define TSTR(x) KERN_WARNING x
++#define TOUT(p) printk p
++
++#elif defined CONFIG_YAFFS_DIRECT
++
++/* Direct interface */
++#include "ydirectenv.h"
++
++#elif defined CONFIG_YAFFS_UTIL
++
++/* Stuff for YAFFS utilities */
++
++#include "stdlib.h"
++#include "stdio.h"
++#include "string.h"
++
++#include "devextras.h"
++
++#define YMALLOC(x) malloc(x)
++#define YFREE(x) free(x)
++#define YMALLOC_ALT(x) malloc(x)
++#define YFREE_ALT(x) free(x)
++
++#define YCHAR char
++#define YUCHAR unsigned char
++#define _Y(x) x
++#define yaffs_strcpy(a,b) strcpy(a,b)
++#define yaffs_strncpy(a,b,c) strncpy(a,b,c)
++#define yaffs_strlen(s) strlen(s)
++#define yaffs_sprintf sprintf
++#define yaffs_toupper(a) toupper(a)
++
++#define Y_INLINE inline
++
++/* #define YINFO(s) YPRINTF(( __FILE__ " %d %s\n",__LINE__,s)) */
++/* #define YALERT(s) YINFO(s) */
++
++#define TENDSTR "\n"
++#define TSTR(x) x
++#define TOUT(p) printf p
++
++#define YAFFS_LOSTNFOUND_NAME "lost+found"
++#define YAFFS_LOSTNFOUND_PREFIX "obj"
++/* #define YPRINTF(x) printf x */
++
++#define YAFFS_ROOT_MODE 0666
++#define YAFFS_LOSTNFOUND_MODE 0666
++
++#define yaffs_SumCompare(x,y) ((x) == (y))
++#define yaffs_strcmp(a,b) strcmp(a,b)
++
++#else
++/* Should have specified a configuration type */
++#error Unknown configuration
++
++#endif
++
++extern unsigned yaffs_traceMask;
++
++#define YAFFS_TRACE_ERROR 0x00000001
++#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_ALWAYS 0x40000000
++#define YAFFS_TRACE_BUG 0x80000000
++
++#define T(mask,p) do{ if((mask) & (yaffs_traceMask | YAFFS_TRACE_ERROR)) TOUT(p);} while(0)
++
++#ifndef CONFIG_YAFFS_WINCE
++#define YBUG() T(YAFFS_TRACE_BUG,(TSTR("==>> yaffs bug: " __FILE__ " %d" TENDSTR),__LINE__))
++#endif
++
++#endif
+Index: linux-2.6.20.1/fs/Makefile
+===================================================================
+--- linux-2.6.20.1.orig/fs/Makefile 2007-03-04 16:08:24.000000000 +0100
++++ linux-2.6.20.1/fs/Makefile 2007-03-04 16:09:34.000000000 +0100
+@@ -115,3 +115,4 @@
+ obj-$(CONFIG_DEBUG_FS) += debugfs/
+ obj-$(CONFIG_OCFS2_FS) += ocfs2/
+ obj-$(CONFIG_GFS2_FS) += gfs2/
++obj-$(CONFIG_YAFFS_FS) += yaffs2/
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