prepare for the transition to linux 2.6.22 - make it possible to override the kernel version in the target makefile

SVN-Revision: 7644

1 files changed, 15021 insertions, 0 deletions

diff --git a/target/linux/generic-2.6/patches-2.6.22/510-Yaffs.patch b/target/linux/generic-2.6/patches-2.6.22/510-Yaffs.patch
new file mode 100644
index 0000000..99775d7
--- /dev/null
+++ b/target/linux/generic-2.6/patches-2.6.22/510-Yaffs.patch
@@ -0,0 +1,15021 @@
+diff -urN linux-2.6.21.1/fs/Kconfig linux-2.6.21.1.new/fs/Kconfig
+--- linux-2.6.21.1/fs/Kconfig	2007-06-08 14:07:09.000000000 +0200
++++ linux-2.6.21.1.new/fs/Kconfig	2007-06-08 14:09:26.000000000 +0200
+@@ -419,6 +419,7 @@
+ 
+ source "fs/xfs/Kconfig"
+ source "fs/gfs2/Kconfig"
++source "fs/yaffs2/Kconfig"
+ 
+ config OCFS2_FS
+ 	tristate "OCFS2 file system support"
+diff -urN linux-2.6.21.1/fs/Makefile linux-2.6.21.1.new/fs/Makefile
+--- linux-2.6.21.1/fs/Makefile	2007-06-08 14:07:09.000000000 +0200
++++ linux-2.6.21.1.new/fs/Makefile	2007-06-08 14:09:51.000000000 +0200
+@@ -116,3 +116,4 @@
+ obj-$(CONFIG_DEBUG_FS)		+= debugfs/
+ obj-$(CONFIG_OCFS2_FS)		+= ocfs2/
+ obj-$(CONFIG_GFS2_FS)           += gfs2/
++obj-$(CONFIG_YAFFS_FS)		+= yaffs2/
+diff -urN linux-2.6.21.1/fs/yaffs2/Kconfig linux-2.6.21.1.new/fs/yaffs2/Kconfig
+--- linux-2.6.21.1/fs/yaffs2/Kconfig	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/Kconfig	2007-06-08 14:07:26.000000000 +0200
+@@ -0,0 +1,175 @@
++#
++# 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_9BYTE_TAGS
++	bool "Use older-style on-NAND data format with pageStatus byte"
++	depends on YAFFS_YAFFS1
++	default n
++	help
++
++	  Older-style on-NAND data format has a "pageStatus" byte to record
++	  chunk/page state.  This byte is zero when the page is discarded.
++	  Choose this option if you have existing on-NAND data using this
++	  format that you need to continue to support.  New data written
++	  also uses the older-style format.  Note: Use of this option
++	  generally requires that MTD's oob layout be adjusted to use the
++	  older-style format.  See notes on tags formats and MTD versions.
++
++	  If unsure, say N.
++
++config YAFFS_DOES_ECC
++	bool "Lets Yaffs do its own ECC"
++	depends on YAFFS_FS && YAFFS_YAFFS1 && !YAFFS_9BYTE_TAGS
++	default n
++	help
++	  This enables Yaffs to use its own ECC functions instead of using
++	  the ones from the generic MTD-NAND driver.
++
++	  If unsure, say N.
++
++config YAFFS_ECC_WRONG_ORDER
++	bool "Use the same ecc byte order as Steven Hill's nand_ecc.c"
++	depends on YAFFS_FS && YAFFS_DOES_ECC && !YAFFS_9BYTE_TAGS
++	default n
++	help
++	  This makes yaffs_ecc.c use the same ecc byte order as Steven
++	  Hill's nand_ecc.c. If not set, then you get the same ecc byte
++	  order as SmartMedia.
++
++	  If unsure, say N.
++
++config YAFFS_YAFFS2
++	bool "2048 byte (or larger) / page devices"
++	depends on YAFFS_FS
++	default y
++	help
++	  Enable YAFFS2 support -- yaffs for >= 2K bytes per page devices
++
++	  If unsure, say Y.
++
++config YAFFS_AUTO_YAFFS2
++	bool "Autoselect yaffs2 format"
++	depends on YAFFS_YAFFS2
++	default y
++	help
++	  Without this, you need to explicitely use yaffs2 as the file
++	  system type. With this, you can say "yaffs" and yaffs or yaffs2
++	  will be used depending on the device page size (yaffs on
++	  512-byte page devices, yaffs2 on 2K page devices).
++
++	  If unsure, say Y.
++
++config YAFFS_DISABLE_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.
+diff -urN linux-2.6.21.1/fs/yaffs2/Makefile linux-2.6.21.1.new/fs/yaffs2/Makefile
+--- linux-2.6.21.1/fs/yaffs2/Makefile	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/Makefile	2007-06-08 14:07:26.000000000 +0200
+@@ -0,0 +1,11 @@
++#
++# 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_mtdif1.o yaffs_packedtags1.o
++yaffs-y += yaffs_mtdif.o yaffs_mtdif2.o
+diff -urN linux-2.6.21.1/fs/yaffs2/devextras.h linux-2.6.21.1.new/fs/yaffs2/devextras.h
+--- linux-2.6.21.1/fs/yaffs2/devextras.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/devextras.h	2007-06-08 14:07:26.000000000 +0200
+@@ -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@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
+diff -urN linux-2.6.21.1/fs/yaffs2/moduleconfig.h linux-2.6.21.1.new/fs/yaffs2/moduleconfig.h
+--- linux-2.6.21.1/fs/yaffs2/moduleconfig.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/moduleconfig.h	2007-06-08 14:07:26.000000000 +0200
+@@ -0,0 +1,65 @@
++/*
++ * 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@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 CONFIG_YAFFS_CHECKPOINT_RESERVED_BLOCKS 10
++
++/*
++Older-style on-NAND data format has a "pageStatus" byte to record
++chunk/page state.  This byte is zeroed when the page is discarded.
++Choose this option if you have existing on-NAND data in this format
++that you need to continue to support.  New data written also uses the
++older-style format.
++Note: Use of this option generally requires that MTD's oob layout be
++adjusted to use the older-style format.  See notes on tags formats and
++MTD versions.
++*/
++/* Default: Not selected */
++/* Meaning: Use older-style on-NAND data format with pageStatus byte */
++#define CONFIG_YAFFS_9BYTE_TAGS
++
++#endif /* YAFFS_OUT_OF_TREE */
++
++#endif /* __YAFFS_CONFIG_H__ */
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_checkptrw.c linux-2.6.21.1.new/fs/yaffs2/yaffs_checkptrw.c
+--- linux-2.6.21.1/fs/yaffs2/yaffs_checkptrw.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_checkptrw.c	2007-06-08 14:07:26.000000000 +0200
+@@ -0,0 +1,404 @@
++/*
++ * 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@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 1.14 2007-05-15 20:07:40 charles 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->checkpointSum = 0;
++	dev->checkpointXor = 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;
++}
++
++int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
++{
++	__u32 compositeSum;
++	compositeSum =  (dev->checkpointSum << 8) | (dev->checkpointXor & 0xFF);
++	*sum = compositeSum;
++	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;
++		
++	if(!dev->checkpointOpenForWrite)
++		return -1;
++
++	while(i < nBytes && ok) {
++		
++
++		
++		dev->checkpointBuffer[dev->checkpointByteOffset] = *dataBytes ;
++		dev->checkpointSum += *dataBytes;
++		dev->checkpointXor ^= *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;
++
++	if(dev->checkpointOpenForWrite)
++		return -1;
++
++	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->checkpointSum += *dataBytes;
++			dev->checkpointXor ^= *dataBytes;
++			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);
++}
++
++
++
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_checkptrw.h linux-2.6.21.1.new/fs/yaffs2/yaffs_checkptrw.h
+--- linux-2.6.21.1/fs/yaffs2/yaffs_checkptrw.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_checkptrw.h	2007-06-08 14:07:26.000000000 +0200
+@@ -0,0 +1,35 @@
++/*
++ * 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@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_GetCheckpointSum(yaffs_Device *dev, __u32 *sum);
++
++int yaffs_CheckpointClose(yaffs_Device *dev);
++
++int yaffs_CheckpointInvalidateStream(yaffs_Device *dev);
++
++
++#endif
++
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_ecc.c linux-2.6.21.1.new/fs/yaffs2/yaffs_ecc.c
+--- linux-2.6.21.1/fs/yaffs2/yaffs_ecc.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_ecc.c	2007-06-08 14:07:26.000000000 +0200
+@@ -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@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;
++
++}
++
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_ecc.h linux-2.6.21.1.new/fs/yaffs2/yaffs_ecc.h
+--- linux-2.6.21.1/fs/yaffs2/yaffs_ecc.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_ecc.h	2007-06-08 14:07:26.000000000 +0200
+@@ -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@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
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_fs.c linux-2.6.21.1.new/fs/yaffs2/yaffs_fs.c
+--- linux-2.6.21.1/fs/yaffs2/yaffs_fs.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_fs.c	2007-06-08 14:07:26.000000000 +0200
+@@ -0,0 +1,2278 @@
++/*
++ * 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@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 1.60 2007-05-15 20:07:40 charles 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
++
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++#define WRITE_SIZE_STR "writesize"
++#define WRITE_SIZE(mtd) (mtd)->writesize
++#else
++#define WRITE_SIZE_STR "oobblock"
++#define WRITE_SIZE(mtd) (mtd)->oobblock
++#endif
++
++#include <asm/uaccess.h>
++
++#include "yportenv.h"
++#include "yaffs_guts.h"
++
++#include <linux/mtd/mtd.h>
++#include "yaffs_mtdif.h"
++#include "yaffs_mtdif1.h"
++#include "yaffs_mtdif2.h"
++
++unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS;
++unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
++
++/* Module Parameters */
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0))
++module_param(yaffs_traceMask,uint,0644);
++module_param(yaffs_wr_attempts,uint,0644);
++#else
++MODULE_PARM(yaffs_traceMask,"i");
++MODULE_PARM(yaffs_wr_attempts,"i");
++#endif
++
++/*#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 int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
++{
++	yaffs_Device    *dev = yaffs_SuperToDevice(sb);
++
++	if( *flags & MS_RDONLY ) {
++		struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
++	    
++		T(YAFFS_TRACE_OS,
++			(KERN_DEBUG "yaffs_remount_fs: %s: RO\n", dev->name ));
++
++		yaffs_GrossLock(dev);
++     	 
++		yaffs_FlushEntireDeviceCache(dev);
++    	
++		yaffs_CheckpointSave(dev);
++ 
++		if (mtd->sync)
++			mtd->sync(mtd);
++
++		yaffs_GrossUnlock(dev);
++	}
++	else {
++		T(YAFFS_TRACE_OS, 
++			(KERN_DEBUG "yaffs_remount_fs: %s: RW\n", dev->name ));
++	}
++ 
++	return 0;
++}
++
++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);
++
++	yaffs_CheckpointSave(dev);
++
++	if (dev->putSuperFunc) {
++		dev->putSuperFunc(sb);
++	}
++
++	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;
++}
++
++typedef struct {
++	int inband_tags;
++	int skip_checkpoint_read;
++	int skip_checkpoint_write;
++	int no_cache;
++} yaffs_options;
++
++#define MAX_OPT_LEN 20
++static int yaffs_parse_options(yaffs_options *options, const char *options_str)
++{
++	char cur_opt[MAX_OPT_LEN+1];
++	int p;
++	int error = 0;
++	
++	/* Parse through the options which is a comma seperated list */
++	
++	while(options_str && *options_str && !error){
++		memset(cur_opt,0,MAX_OPT_LEN+1);
++		p = 0;
++		
++		while(*options_str && *options_str != ','){
++			if(p < MAX_OPT_LEN){
++				cur_opt[p] = *options_str;
++				p++;
++			}
++			options_str++;
++		}
++		
++		if(!strcmp(cur_opt,"inband-tags"))
++			options->inband_tags = 1;
++		else if(!strcmp(cur_opt,"no-cache"))
++			options->no_cache = 1;
++		else if(!strcmp(cur_opt,"no-checkpoint-read"))
++			options->skip_checkpoint_read = 1;
++		else if(!strcmp(cur_opt,"no-checkpoint-write"))
++			options->skip_checkpoint_write = 1;
++		else if(!strcmp(cur_opt,"no-checkpoint")){
++			options->skip_checkpoint_read = 1;
++			options->skip_checkpoint_write = 1;
++		} else {
++			printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",cur_opt);
++			error = 1;
++		}
++		
++	}
++
++	return error;
++}
++
++static struct 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;
++	char *data_str = (char *)data;
++	
++	yaffs_options options;
++
++	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));
++		    
++	if(!data_str)
++		data_str = "";
++   
++	printk(KERN_INFO "yaffs: passed flags \"%s\"\n",data_str);
++	
++	memset(&options,0,sizeof(options));
++	
++	if(yaffs_parse_options(&options,data_str)){
++		/* Option parsing failed */
++		return NULL;
++	}
++
++
++	sb->s_blocksize = PAGE_CACHE_SIZE;
++	sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
++	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));
++	T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
++	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 (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
++		    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 = (options.no_cache) ? 0 : 10;
++
++	/* ... 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 {
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++		/* use the MTD interface in yaffs_mtdif1.c */
++		dev->writeChunkWithTagsToNAND =
++			nandmtd1_WriteChunkWithTagsToNAND;
++		dev->readChunkWithTagsFromNAND =
++			nandmtd1_ReadChunkWithTagsFromNAND;
++		dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
++		dev->queryNANDBlock = nandmtd1_QueryNANDBlock;
++#else
++		dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
++		dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
++#endif
++		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
++
++	dev->skipCheckpointRead = options.skip_checkpoint_read;
++	dev->skipCheckpointWrite = options.skip_checkpoint_write;
++	
++	/* 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, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
++	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, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
++	buf += sprintf(buf, "nCheckptResBlocks.. %d\n", dev->nCheckpointReservedBlocks);
++	buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
++	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, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
++	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.
++ *
++ * Note that the names can only be a..z or _ with the current code.
++ */
++
++static struct {
++	char *mask_name;
++	unsigned mask_bitfield;
++} mask_flags[] = {
++	{"allocate", YAFFS_TRACE_ALLOCATE},
++	{"always", YAFFS_TRACE_ALWAYS},
++	{"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
++	{"buffers", YAFFS_TRACE_BUFFERS},
++	{"bug", YAFFS_TRACE_BUG},
++	{"checkpt", YAFFS_TRACE_CHECKPOINT},
++	{"deletion", YAFFS_TRACE_DELETION},
++	{"erase", YAFFS_TRACE_ERASE},
++	{"error", YAFFS_TRACE_ERROR},
++	{"gc_detail", YAFFS_TRACE_GC_DETAIL},
++	{"gc", YAFFS_TRACE_GC},
++	{"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},
++
++	{"verify", YAFFS_TRACE_VERIFY},
++	{"verify_nand", YAFFS_TRACE_VERIFY_NAND},
++	{"verify_full", YAFFS_TRACE_VERIFY_FULL},
++	{"verify_all", YAFFS_TRACE_VERIFY_ALL},
++
++	{"write", YAFFS_TRACE_WRITE},
++	{"all", 0xffffffff},
++	{"none", 0},
++	{NULL, 0},
++};
++
++#define MAX_MASK_NAME_LENGTH 40
++static int yaffs_proc_write(struct file *file, const char *buf,
++					 unsigned long count, void *data)
++{
++	unsigned rg = 0, mask_bitfield;
++	char *end;
++	char *mask_name;
++	char *x; 
++	char substring[MAX_MASK_NAME_LENGTH+1];
++	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(x = buf + pos, i = 0; 
++			    (*x == '_' || (*x >='a' && *x <= 'z')) &&
++			    i <MAX_MASK_NAME_LENGTH; x++, i++, pos++)
++			    substring[i] = *x;
++			substring[i] = '\0';
++			
++			for (i = 0; mask_flags[i].mask_name != NULL; i++) {
++				//len = strlen(mask_flags[i].mask_name);
++				//if (strncmp(buf + pos, mask_flags[i].mask_name, len) == 0) {
++				if(strcmp(substring,mask_flags[i].mask_name) == 0){
++					mask_name = mask_flags[i].mask_name;
++					mask_bitfield = mask_flags[i].mask_bitfield;
++					done = 0;
++					break;
++				}
++			}
++		}
++
++		if (mask_name != NULL) {
++			// 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;
++	
++	printk("new trace = 0x%08X\n",yaffs_traceMask);
++	
++	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");
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_guts.c linux-2.6.21.1.new/fs/yaffs2/yaffs_guts.c
+--- linux-2.6.21.1/fs/yaffs2/yaffs_guts.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_guts.c	2007-06-08 14:07:26.000000000 +0200
+@@ -0,0 +1,7469 @@
++/*
++ * 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@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 1.49 2007-05-15 20:07:40 charles Exp $";
++
++#include "yportenv.h"
++
++#include "yaffsinterface.h"
++#include "yaffs_guts.h"
++#include "yaffs_tagsvalidity.h"
++
++#include "yaffs_tagscompat.h"
++#ifndef  CONFIG_YAFFS_USE_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);
++
++static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
++
++#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);
++
++static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
++				 yaffs_ExtendedTags * tags);
++
++static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos);
++static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
++					  yaffs_FileStructure * fStruct,
++					  __u32 chunkId);
++
++
++/* 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 int yaffs_InitialiseTempBuffers(yaffs_Device *dev)	
++{
++	int i;
++	__u8 *buf = (__u8 *)1;
++		
++	memset(dev->tempBuffer,0,sizeof(dev->tempBuffer));
++		
++	for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
++		dev->tempBuffer[i].line = 0;	/* not in use */
++		dev->tempBuffer[i].buffer = buf =
++		    YMALLOC_DMA(dev->nDataBytesPerChunk);
++	}
++		
++	return buf ? YAFFS_OK : YAFFS_FAIL;
++	
++}
++
++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_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
++{
++	if(blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
++	   chunk < 0 || chunk >= dev->nChunksPerBlock) {
++	   T(YAFFS_TRACE_ERROR,
++	    (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),blk,chunk));
++	    YBUG();
++	}
++}
++
++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);
++
++	yaffs_VerifyChunkBitId(dev,blk,chunk);
++
++	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);
++	
++	yaffs_VerifyChunkBitId(dev,blk,chunk);
++
++	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);
++	yaffs_VerifyChunkBitId(dev,blk,chunk);
++
++	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;
++}
++
++static int yaffs_CountChunkBits(yaffs_Device * dev, int blk)
++{
++	__u8 *blkBits = yaffs_BlockBits(dev, blk);
++	int i;
++	int n = 0;
++	for (i = 0; i < dev->chunkBitmapStride; i++) {
++		__u8 x = *blkBits;
++		while(x){
++			if(x & 1)
++				n++;
++			x >>=1;
++		}
++			
++		blkBits++;
++	}
++	return n;
++}
++
++/* 
++ * Verification code
++ */
++ 
++static int yaffs_SkipVerification(yaffs_Device *dev)
++{
++	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
++}
++
++static int yaffs_SkipFullVerification(yaffs_Device *dev)
++{
++	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
++}
++
++static int yaffs_SkipNANDVerification(yaffs_Device *dev)
++{
++	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
++}
++
++static const char * blockStateName[] = {
++"Unknown",
++"Needs scanning",
++"Scanning",
++"Empty",
++"Allocating",
++"Full",
++"Dirty",
++"Checkpoint",
++"Collecting",
++"Dead"
++};
++
++static void yaffs_VerifyBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
++{
++	int actuallyUsed;
++	int inUse;
++	
++	if(yaffs_SkipVerification(dev))
++		return;
++		
++	/* Report illegal runtime states */
++	if(bi->blockState <0 || bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
++		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has undefined state %d"TENDSTR),n,bi->blockState));
++		
++	switch(bi->blockState){
++	 case YAFFS_BLOCK_STATE_UNKNOWN:
++	 case YAFFS_BLOCK_STATE_SCANNING:
++	 case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
++		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has bad run-state %s"TENDSTR),
++		n,blockStateName[bi->blockState]));
++	}
++	
++	/* Check pages in use and soft deletions are legal */
++	
++	actuallyUsed = bi->pagesInUse - bi->softDeletions;
++	
++	if(bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
++	   bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
++	   actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
++		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
++		n,bi->pagesInUse,bi->softDeletions));
++	
++		
++	/* Check chunk bitmap legal */
++	inUse = yaffs_CountChunkBits(dev,n);
++	if(inUse != bi->pagesInUse)
++		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
++			n,bi->pagesInUse,inUse));
++	
++	/* Check that the sequence number is valid.
++	 * Ten million is legal, but is very unlikely 
++	 */
++	if(dev->isYaffs2 && 
++	   (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
++	   (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000 ))
++		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has suspect sequence number of %d"TENDSTR),
++		n,bi->sequenceNumber));
++		
++}
++
++static void yaffs_VerifyCollectedBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
++{
++	yaffs_VerifyBlock(dev,bi,n);
++	
++	/* After collection the block should be in the erased state */
++	/* TODO: This will need to change if we do partial gc */
++	
++	if(bi->blockState != YAFFS_BLOCK_STATE_EMPTY){
++		T(YAFFS_TRACE_ERROR,(TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
++			n,bi->blockState));
++	}
++}
++
++static void yaffs_VerifyBlocks(yaffs_Device *dev)
++{
++	int i;
++	int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
++	int nIllegalBlockStates = 0;
++	
++
++	if(yaffs_SkipVerification(dev))
++		return;
++
++	memset(nBlocksPerState,0,sizeof(nBlocksPerState));
++
++		
++	for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++){
++		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
++		yaffs_VerifyBlock(dev,bi,i);
++
++		if(bi->blockState >=0 && bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
++			nBlocksPerState[bi->blockState]++;
++		else
++			nIllegalBlockStates++;
++					
++	}
++	
++	T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
++	T(YAFFS_TRACE_VERIFY,(TSTR("Block summary"TENDSTR)));
++	
++	T(YAFFS_TRACE_VERIFY,(TSTR("%d blocks have illegal states"TENDSTR),nIllegalBlockStates));
++	if(nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
++		T(YAFFS_TRACE_VERIFY,(TSTR("Too many allocating blocks"TENDSTR)));
++
++	for(i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
++		T(YAFFS_TRACE_VERIFY,
++		  (TSTR("%s %d blocks"TENDSTR),
++		  blockStateName[i],nBlocksPerState[i]));
++	
++	if(dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
++		T(YAFFS_TRACE_VERIFY,
++		 (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
++		 dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
++		 
++	if(dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
++		T(YAFFS_TRACE_VERIFY,
++		 (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
++		 dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
++		 
++	if(nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
++		T(YAFFS_TRACE_VERIFY,
++		 (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
++		 nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
++
++	T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
++
++}
++
++/*
++ * Verify the object header. oh must be valid, but obj and tags may be NULL in which
++ * case those tests will not be performed.
++ */
++static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
++{
++	if(yaffs_SkipVerification(obj->myDev))
++		return;
++		
++	if(!(tags && obj && oh)){
++	 	T(YAFFS_TRACE_VERIFY,
++		 		(TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
++		 		(__u32)tags,(__u32)obj,(__u32)oh));
++		return;
++	}
++	
++	if(oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
++	   oh->type > YAFFS_OBJECT_TYPE_MAX)
++	 	T(YAFFS_TRACE_VERIFY,
++		 (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
++		 tags->objectId, oh->type));
++
++	if(tags->objectId != obj->objectId)
++	 	T(YAFFS_TRACE_VERIFY,
++		 (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
++		 tags->objectId, obj->objectId));
++
++
++	/*
++	 * Check that the object's parent ids match if parentCheck requested.
++	 * 
++	 * Tests do not apply to the root object.
++	 */
++	
++	if(parentCheck && tags->objectId > 1 && !obj->parent)
++	 	T(YAFFS_TRACE_VERIFY,
++		 (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
++	 	 tags->objectId, oh->parentObjectId));
++		
++	
++	if(parentCheck && obj->parent &&
++	   oh->parentObjectId != obj->parent->objectId && 
++	   (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
++	    obj->parent->objectId != YAFFS_OBJECTID_DELETED))
++	 	T(YAFFS_TRACE_VERIFY,
++		 (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
++	 	 tags->objectId, oh->parentObjectId, obj->parent->objectId));
++		
++	
++	if(tags->objectId > 1 && oh->name[0] == 0) /* Null name */
++		T(YAFFS_TRACE_VERIFY,
++		(TSTR("Obj %d header name is NULL"TENDSTR),
++		 obj->objectId));
++
++	if(tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
++		T(YAFFS_TRACE_VERIFY,
++		(TSTR("Obj %d header name is 0xFF"TENDSTR),
++		 obj->objectId));
++}
++
++
++
++static int yaffs_VerifyTnodeWorker(yaffs_Object * obj, yaffs_Tnode * tn,
++				  	__u32 level, int chunkOffset)
++{
++	int i;
++	yaffs_Device *dev = obj->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_VerifyTnodeWorker(obj,
++							tn->internal[i],
++							level - 1,
++							(chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
++				}
++			}
++		} else if (level == 0) {
++			int i;
++			yaffs_ExtendedTags tags;
++			__u32 objectId = obj->objectId;
++			
++			chunkOffset <<=  YAFFS_TNODES_LEVEL0_BITS;
++			
++			for(i = 0; i < YAFFS_NTNODES_LEVEL0; i++){
++				__u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
++				
++				if(theChunk > 0){
++					/* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
++					yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
++					if(tags.objectId != objectId || tags.chunkId != chunkOffset){
++						T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
++							objectId, chunkOffset, theChunk,
++							tags.objectId, tags.chunkId));
++					}
++				}
++				chunkOffset++;
++			}
++		}
++	}
++
++	return ok;
++
++}
++
++
++static void yaffs_VerifyFile(yaffs_Object *obj)
++{
++	int requiredTallness;
++	int actualTallness;
++	__u32 lastChunk;
++	__u32 x;
++	__u32 i;
++	int ok;
++	yaffs_Device *dev;
++	yaffs_ExtendedTags tags;
++	yaffs_Tnode *tn;
++	__u32 objectId;
++	
++	if(obj && yaffs_SkipVerification(obj->myDev))
++		return;
++	
++	dev = obj->myDev;
++	objectId = obj->objectId;
++	
++	/* Check file size is consistent with tnode depth */
++	lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
++	x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
++	requiredTallness = 0;
++	while (x> 0) {
++		x >>= YAFFS_TNODES_INTERNAL_BITS;
++		requiredTallness++;
++	}
++	
++	actualTallness = obj->variant.fileVariant.topLevel;
++	
++	if(requiredTallness > actualTallness )
++		T(YAFFS_TRACE_VERIFY,
++		(TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
++		 obj->objectId,actualTallness, requiredTallness));
++	
++	
++	/* Check that the chunks in the tnode tree are all correct. 
++	 * We do this by scanning through the tnode tree and
++	 * checking the tags for every chunk match.
++	 */
++
++	if(yaffs_SkipNANDVerification(dev))
++		return;
++		
++	for(i = 1; i <= lastChunk; i++){
++		tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant,i);
++
++		if (tn) {
++			__u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
++			if(theChunk > 0){
++				/* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
++				yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
++				if(tags.objectId != objectId || tags.chunkId != i){
++					T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
++						objectId, i, theChunk,
++						tags.objectId, tags.chunkId));
++				}
++			}
++		}
++
++	}
++
++}
++
++static void yaffs_VerifyDirectory(yaffs_Object *obj)
++{
++	if(obj && yaffs_SkipVerification(obj->myDev))
++		return;
++	
++}
++
++static void yaffs_VerifyHardLink(yaffs_Object *obj)
++{
++	if(obj && yaffs_SkipVerification(obj->myDev))
++		return;
++		
++	/* Verify sane equivalent object */
++}
++
++static void yaffs_VerifySymlink(yaffs_Object *obj)
++{
++	if(obj && yaffs_SkipVerification(obj->myDev))
++		return;
++		
++	/* Verify symlink string */
++}
++
++static void yaffs_VerifySpecial(yaffs_Object *obj)
++{
++	if(obj && yaffs_SkipVerification(obj->myDev))
++		return;
++}
++
++static void yaffs_VerifyObject(yaffs_Object *obj)
++{
++	yaffs_Device *dev;
++	
++	__u32 chunkMin;
++	__u32 chunkMax;
++	
++	__u32 chunkIdOk;
++	__u32 chunkIsLive;
++	
++	if(!obj)
++		return;
++	
++	dev = obj->myDev;
++	
++	if(yaffs_SkipVerification(dev))
++		return;
++		
++	/* Check sane object header chunk */
++	
++	chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
++	chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
++	
++	chunkIdOk = (obj->chunkId >= chunkMin && obj->chunkId <= chunkMax);
++	chunkIsLive = chunkIdOk && 
++			yaffs_CheckChunkBit(dev, 
++					    obj->chunkId / dev->nChunksPerBlock,
++					    obj->chunkId % dev->nChunksPerBlock);
++	if(!obj->fake && 
++	    (!chunkIdOk || !chunkIsLive)) {
++	   T(YAFFS_TRACE_VERIFY,
++	   (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
++	   obj->objectId,obj->chunkId,
++	   chunkIdOk ? "" : ",out of range",
++	   chunkIsLive || !chunkIdOk ? "" : ",marked as deleted"));
++	}
++	
++	if(chunkIdOk && chunkIsLive &&!yaffs_SkipNANDVerification(dev)) {
++		yaffs_ExtendedTags tags;
++		yaffs_ObjectHeader *oh;
++		__u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
++		
++		oh = (yaffs_ObjectHeader *)buffer;
++		
++		yaffs_ReadChunkWithTagsFromNAND(dev, obj->chunkId,buffer, &tags);
++		
++		yaffs_VerifyObjectHeader(obj,oh,&tags,1);
++		
++		yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
++	}
++	
++	/* Verify it has a parent */
++	if(obj && !obj->fake &&
++	   (!obj->parent || obj->parent->myDev != dev)){
++	   T(YAFFS_TRACE_VERIFY,
++	   (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
++	   obj->objectId,obj->parent));	   
++	}
++	
++	/* Verify parent is a directory */
++	if(obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY){
++	   T(YAFFS_TRACE_VERIFY,
++	   (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
++	   obj->objectId,obj->parent->variantType));	   
++	}
++	
++	switch(obj->variantType){
++	case YAFFS_OBJECT_TYPE_FILE:
++		yaffs_VerifyFile(obj);
++		break;
++	case YAFFS_OBJECT_TYPE_SYMLINK:
++		yaffs_VerifySymlink(obj);
++		break;
++	case YAFFS_OBJECT_TYPE_DIRECTORY:
++		yaffs_VerifyDirectory(obj);
++		break;
++	case YAFFS_OBJECT_TYPE_HARDLINK:
++		yaffs_VerifyHardLink(obj);
++		break;
++	case YAFFS_OBJECT_TYPE_SPECIAL:
++		yaffs_VerifySpecial(obj);
++		break;
++	case YAFFS_OBJECT_TYPE_UNKNOWN:
++	default:
++		T(YAFFS_TRACE_VERIFY,
++		(TSTR("Obj %d has illegaltype %d"TENDSTR),
++		obj->objectId,obj->variantType));	   
++		break;
++	}
++	
++	
++}
++
++static void yaffs_VerifyObjects(yaffs_Device *dev)
++{
++	yaffs_Object *obj;
++	int i;
++	struct list_head *lh;
++
++	if(yaffs_SkipVerification(dev))
++		return;
++	
++	/* Iterate through the objects in each hash entry */
++	 
++	 for(i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++){
++	 	list_for_each(lh, &dev->objectBucket[i].list) {
++			if (lh) {
++				obj = list_entry(lh, yaffs_Object, hashLink);
++				yaffs_VerifyObject(obj);
++			}
++		}
++	 }
++
++}
++
++
++/*
++ *  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 attempts = 0;
++	int writeOk = 0;
++	int chunk;
++
++	yaffs_InvalidateCheckpoint(dev);
++
++	do {
++		yaffs_BlockInfo *bi = 0;
++		int erasedOk = 0;
++
++		chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
++		if (chunk < 0) {
++			/* no space */
++			break;
++		}
++
++		/* First check this chunk is erased, if it needs
++		 * checking.  The checking policy (unless forced
++		 * always on) is as follows:
++		 *
++		 * Check the first page we try to write in a block.
++		 * If the check passes then we don't need to check any
++		 * more.	If the check fails, we check again...
++		 * If the block has been erased, we don't need to check.
++		 *
++		 * However, if the block has been prioritised for gc,
++		 * then we think there might be something odd about
++		 * this block and stop using it.
++		 *
++		 * Rationale: We should only ever see chunks that have
++		 * not been erased if there was a partially written
++		 * chunk due to power loss.  This checking policy should
++		 * catch that case with very few checks and thus save a
++		 * lot of checks that are most likely not needed.
++		 */
++		if (bi->gcPrioritise) {
++			yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
++			/* try another chunk */
++			continue;
++		}
++
++		/* let's give it a try */
++		attempts++;
++
++#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
++		bi->skipErasedCheck = 0;
++#endif
++		if (!bi->skipErasedCheck) {
++			erasedOk = yaffs_CheckChunkErased(dev, chunk);
++			if (erasedOk != YAFFS_OK) {
++				T(YAFFS_TRACE_ERROR,
++				(TSTR ("**>> yaffs chunk %d was not erased"
++				TENDSTR), chunk));
++
++				/* try another chunk */
++				continue;
++			}
++			bi->skipErasedCheck = 1;
++		}
++
++		writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
++				data, tags);
++		if (writeOk != YAFFS_OK) {
++			yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
++			/* try another chunk */
++			continue;
++		}
++
++		/* Copy the data into the robustification buffer */
++		yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
++
++	} while (writeOk != YAFFS_OK && attempts < yaffs_wr_attempts);
++
++	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_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/2))) {
++
++#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)));
++		   return YAFFS_FAIL;
++
++	} 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));
++  }
++}
++
++static __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));
++	list = YMALLOC(sizeof(yaffs_ObjectList));
++
++	if (!newObjects || !list) {
++		if(newObjects)
++			YFREE(newObjects);
++		if(list)
++			YFREE(list);
++		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->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;
++	yaffs_Tnode *tn;
++
++	if (number < 0) {
++		number = yaffs_CreateNewObjectNumber(dev);
++	}
++
++	theObject = yaffs_AllocateEmptyObject(dev);
++	if(!theObject)
++		return NULL;
++		
++	if(type == YAFFS_OBJECT_TYPE_FILE){
++		tn = yaffs_GetTnode(dev);
++		if(!tn){
++			yaffs_FreeObject(theObject);
++			return NULL;
++		}
++	}
++		
++	
++
++	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 = tn;
++			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));
++		if(newStr)
++			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;
++	YCHAR *str;
++
++	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(type == YAFFS_OBJECT_TYPE_SYMLINK){
++		str = yaffs_CloneString(aliasString);
++		if(!str){
++			yaffs_FreeObject(in);
++			return NULL;
++		}
++	}
++	
++	
++
++	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 = str;
++			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->blockInfo = NULL;
++	dev->chunkBits = NULL;
++	
++	dev->allocationBlock = -1;	/* force it to get a new one */
++
++	/* If the first allocation strategy fails, thry the alternate one */
++	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;
++		
++	if(dev->blockInfo){
++	
++		/* 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 && dev->blockInfo)
++		YFREE_ALT(dev->blockInfo);
++	else if(dev->blockInfo)
++		YFREE(dev->blockInfo);
++
++	dev->blockInfoAlt = 0;
++
++	dev->blockInfo = NULL;
++	
++	if(dev->chunkBitsAlt && dev->chunkBits)
++		YFREE_ALT(dev->chunkBits);
++	else if(dev->chunkBits)
++		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 = 0;
++	int prioritised=0;
++	yaffs_BlockInfo *bi;
++	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);
++			//yaffs_VerifyBlock(dev,bi,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.
++	 */
++
++	dev->nonAggressiveSkip--;
++
++	if (!aggressive && (dev->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) {
++		dev->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) || !yaffs_SkipVerification(dev))) {
++		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 matchingChunk;
++
++	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__);
++		
++		yaffs_VerifyBlock(dev,bi,block);
++
++		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 && !yaffs_SkipVerification(dev)){
++					if(tags.chunkId == 0)
++						matchingChunk = object->chunkId;
++					else if(object->softDeleted)
++						matchingChunk = oldChunk; /* Defeat the test */
++					else
++						matchingChunk = yaffs_FindChunkInFile(object,tags.chunkId,NULL);
++					
++					if(oldChunk != matchingChunk)
++						T(YAFFS_TRACE_ERROR,
++						  (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
++						  oldChunk,matchingChunk,tags.objectId, tags.chunkId));
++						
++				}
++
++				if (!object) {
++					T(YAFFS_TRACE_ERROR,
++					  (TSTR
++					   ("page %d in gc has no object: %d %d %d "
++					    TENDSTR), oldChunk,
++					    tags.objectId, tags.chunkId, tags.byteCount));
++				}
++
++				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;
++						
++						yaffs_VerifyObjectHeader(object,oh,&tags,1);
++					}
++
++					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--;
++			}
++
++		}
++
++	}
++
++	yaffs_VerifyCollectedBlock(dev,bi,block);
++	  
++	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 + 2)) {
++			/* 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;
++
++
++	if(!yaffs_CheckChunkBit(dev,block,page))
++		T(YAFFS_TRACE_VERIFY,
++		 	(TSTR("Deleting invalid chunk %d"TENDSTR),
++		 	 chunkId));
++
++	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;
++	yaffs_ExtendedTags oldTags;
++
++	__u8 *buffer = NULL;
++	YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
++
++	yaffs_ObjectHeader *oh = NULL;
++	
++	yaffs_strcpy(oldName,"silly old name");
++
++	if (!in->fake || force) {
++
++		yaffs_CheckGarbageCollection(dev);
++		yaffs_CheckObjectDetailsLoaded(in);
++
++		buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
++		oh = (yaffs_ObjectHeader *) buffer;
++
++		prevChunkId = in->chunkId;
++
++		if (prevChunkId >= 0) {
++			result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
++							buffer, &oldTags);
++			
++			yaffs_VerifyObjectHeader(in,oh,&oldTags,0);
++										
++			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>=0) {
++			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;
++
++		yaffs_VerifyObjectHeader(in,oh,&newTags,1);
++
++		/* 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;
++	
++	memset(&cp,0,sizeof(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;
++	int nread = 0;
++	
++	ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
++	
++	while(ok && (~baseChunk)){
++		nread++;
++		/* 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));
++		
++	}
++
++	T(YAFFS_TRACE_CHECKPOINT,(
++		TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
++		nread,baseChunk,ok));
++
++	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)) {
++			T(YAFFS_TRACE_CHECKPOINT,(TSTR("struct size %d instead of %d ok %d"TENDSTR),
++				cp.structType,sizeof(cp),ok));
++			ok = 0;
++		}
++			
++		T(YAFFS_TRACE_CHECKPOINT,(TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
++			cp.objectId,cp.parentId,cp.variantType,cp.chunkId));
++			
++		if(ok && cp.objectId == ~0)
++			done = 1;
++		else if(ok){
++			obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
++			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_WriteCheckpointSum(yaffs_Device *dev)
++{
++	__u32 checkpointSum;
++	int ok;
++	
++	yaffs_GetCheckpointSum(dev,&checkpointSum);
++	
++	ok = (yaffs_CheckpointWrite(dev,&checkpointSum,sizeof(checkpointSum)) == sizeof(checkpointSum));
++	
++	if(!ok)
++		return 0;
++	
++	return 1;
++}
++
++static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
++{
++	__u32 checkpointSum0;
++	__u32 checkpointSum1;
++	int ok;
++	
++	yaffs_GetCheckpointSum(dev,&checkpointSum0);
++	
++	ok = (yaffs_CheckpointRead(dev,&checkpointSum1,sizeof(checkpointSum1)) == sizeof(checkpointSum1));
++	
++	if(!ok)
++		return 0;
++		
++	if(checkpointSum0 != checkpointSum1)
++		return 0;
++	
++	return 1;
++}
++
++
++static int yaffs_WriteCheckpointData(yaffs_Device *dev)
++{
++
++	int ok = 1;
++	
++	if(dev->skipCheckpointWrite || !dev->isYaffs2){
++		T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint write" TENDSTR)));
++		ok = 0;
++	}
++		
++	if(ok)
++		ok = yaffs_CheckpointOpen(dev,1);
++	
++	if(ok){
++		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
++		ok = yaffs_WriteCheckpointValidityMarker(dev,1);
++	}
++	if(ok){
++		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint device" TENDSTR)));
++		ok = yaffs_WriteCheckpointDevice(dev);
++	}
++	if(ok){
++		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint objects" TENDSTR)));
++		ok = yaffs_WriteCheckpointObjects(dev);
++	}
++	if(ok){
++		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
++		ok = yaffs_WriteCheckpointValidityMarker(dev,0);
++	}
++	
++	if(ok){
++		ok = yaffs_WriteCheckpointSum(dev);
++	}
++	
++	
++	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 = 1;
++	
++	if(dev->skipCheckpointRead || !dev->isYaffs2){
++		T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint read" TENDSTR)));
++		ok = 0;
++	}
++	
++	if(ok)
++		ok = yaffs_CheckpointOpen(dev,0); /* open for read */
++	
++	if(ok){
++		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));	
++		ok = yaffs_ReadCheckpointValidityMarker(dev,1);
++	}
++	if(ok){
++		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint device" TENDSTR)));
++		ok = yaffs_ReadCheckpointDevice(dev);
++	}
++	if(ok){
++		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint objects" TENDSTR)));	
++		ok = yaffs_ReadCheckpointObjects(dev);
++	}
++	if(ok){
++		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
++		ok = yaffs_ReadCheckpointValidityMarker(dev,0);
++	}
++	
++	if(ok){
++		ok = yaffs_ReadCheckpointSum(dev);
++		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint checksum %d" TENDSTR),ok));
++	}
++
++	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)
++{
++
++	T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
++
++	yaffs_VerifyObjects(dev);
++	yaffs_VerifyBlocks(dev);
++	yaffs_VerifyFreeChunks(dev);
++
++	if(!dev->isCheckpointed) {
++		yaffs_InvalidateCheckpoint(dev);
++		yaffs_WriteCheckpointData(dev);
++	}
++	
++	T(YAFFS_TRACE_ALWAYS,(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);
++
++	if(dev->isCheckpointed){
++		yaffs_VerifyObjects(dev);
++		yaffs_VerifyBlocks(dev);
++		yaffs_VerifyFreeChunks(dev);
++	}
++
++	T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
++	
++	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);
++	} else {
++		/* newsSize > oldFileSize */
++		in->variant.fileVariant.fileSize = newSize;
++	}
++
++		
++	
++	/* 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,"deleted", 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,
++						   "deleted", 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,
++						   "unlinked", 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_BlockInfo *bi;
++	int sequenceNumber;
++	yaffs_ObjectHeader *oh;
++	yaffs_Object *in;
++	yaffs_Object *parent;
++	int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
++	
++	int alloc_failed = 0;
++	
++
++	__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));
++		if(!blockIndex)
++			return YAFFS_FAIL;
++	}
++
++	/* 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; !alloc_failed && 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; !alloc_failed && 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).
++				 */
++				 
++				if(!in)
++					alloc_failed = 1;
++
++				if(in){
++					if(!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,1))
++						alloc_failed = 1;
++				}
++				
++				endpos =
++				    (tags.chunkId - 1) * dev->nDataBytesPerChunk +
++				    tags.byteCount;
++				if (in && 
++				    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(!in)
++					alloc_failed = 1;
++					
++				if (in && oh->shadowsObject > 0) {
++					yaffs_HandleShadowedObject(dev,
++								   oh->
++								   shadowsObject,
++								   0);
++				}
++
++				if (in && 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 && !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 && !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);
++						if(!in->variant.symLinkVariant.alias)
++							alloc_failed = 1;
++						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__);
++
++	if(alloc_failed){
++		return YAFFS_FAIL;
++	}
++	
++	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;
++	int alloc_failed = 0;
++
++	if(!in)
++		return;
++		
++#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);
++			if(!in->variant.symLinkVariant.alias)
++				alloc_failed = 1; /* Not returned to caller */
++		}
++						    
++		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;
++	int alloc_failed = 0;
++	
++
++	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;
++	}
++	
++	dev->blocksInCheckpoint = 0;
++	
++	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){
++			dev->blocksInCheckpoint++;
++			
++		} 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
++	yaffs_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; !alloc_failed && 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; 
++		     !alloc_failed && 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){
++					/* Out of memory */
++					alloc_failed = 1;
++				}
++				
++				if (in &&
++				    in->variantType == YAFFS_OBJECT_TYPE_FILE
++				    && chunkBase <
++				    in->variant.fileVariant.shrinkSize) {
++					/* This has not been invalidated by a resize */
++					if(!yaffs_PutChunkIntoFile(in, tags.chunkId,
++							       chunk, -1)){
++						alloc_failed = 1;
++					}
++
++					/* File size is calculated by looking at the data chunks if we have not 
++					 * seen an object header yet. Stop this practice once we find an object header.
++					 */
++					endpos =
++					    (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 if(in) {
++					/* 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);
++						   if(!in->variant.symLinkVariant.alias)
++						   	alloc_failed = 1;
++						}
++						break;
++					}
++
++				}
++				
++			}
++
++		} /* End of scanning for each chunk */
++
++		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__);
++	
++	if(alloc_failed){
++		return YAFFS_FAIL;
++	}
++
++	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_strncmp(name, buffer,YAFFS_MAX_NAME_LENGTH) == 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;
++		yaffs_CheckObjectDetailsLoaded(obj);
++	}
++	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 int 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);
++	
++	if(dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir){
++		yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
++		return YAFFS_OK;
++	}
++	
++	return YAFFS_FAIL;
++}
++
++int yaffs_GutsInitialise(yaffs_Device * dev)
++{
++	int init_failed = 0;
++	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. */
++	if(!yaffs_InitialiseTempBuffers(dev))
++		init_failed = 1;
++	
++	dev->srCache = NULL;
++	dev->gcCleanupList = NULL;
++	
++	
++	if (!init_failed &&
++	    dev->nShortOpCaches > 0) {
++		int i;
++		__u8 *buf;
++		int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
++
++		if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
++			dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
++		}
++
++		buf = dev->srCache =  YMALLOC(srCacheBytes);
++		    
++		if(dev->srCache)
++			memset(dev->srCache,0,srCacheBytes);
++		   
++		for (i = 0; i < dev->nShortOpCaches && buf; i++) {
++			dev->srCache[i].object = NULL;
++			dev->srCache[i].lastUse = 0;
++			dev->srCache[i].dirty = 0;
++			dev->srCache[i].data = buf = YMALLOC_DMA(dev->nDataBytesPerChunk);
++		}
++		if(!buf)
++			init_failed = 1;
++			
++		dev->srLastUse = 0;
++	}
++
++	dev->cacheHits = 0;
++	
++	if(!init_failed){
++		dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
++		if(!dev->gcCleanupList)
++			init_failed = 1;
++	}
++
++	if (dev->isYaffs2) {
++		dev->useHeaderFileSize = 1;
++	}
++	if(!init_failed && !yaffs_InitialiseBlocks(dev))
++		init_failed = 1;
++		
++	yaffs_InitialiseTnodes(dev);
++	yaffs_InitialiseObjects(dev);
++
++	if(!init_failed && !yaffs_CreateInitialDirectories(dev))
++		init_failed = 1;
++
++
++	if(!init_failed){
++		/* 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);
++				
++			
++				dev->nErasedBlocks = 0;
++				dev->nFreeChunks = 0;
++				dev->allocationBlock = -1;
++				dev->allocationPage = -1;
++				dev->nDeletedFiles = 0;
++				dev->nUnlinkedFiles = 0;
++				dev->nBackgroundDeletions = 0;
++				dev->oldestDirtySequence = 0;
++
++				if(!init_failed && !yaffs_InitialiseBlocks(dev))
++					init_failed = 1;
++					
++				yaffs_InitialiseTnodes(dev);
++				yaffs_InitialiseObjects(dev);
++
++				if(!init_failed && !yaffs_CreateInitialDirectories(dev))
++					init_failed = 1;
++
++				if(!init_failed && !yaffs_ScanBackwards(dev))
++					init_failed = 1;
++			}
++		}else
++			if(!yaffs_Scan(dev))
++				init_failed = 1;
++	}
++		
++	if(init_failed){
++		/* Clean up the mess */
++		T(YAFFS_TRACE_TRACING,
++		  (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
++
++		yaffs_Deinitialise(dev);
++		return YAFFS_FAIL;
++	}
++
++	/* Zero out stats */
++	dev->nPageReads = 0;
++	dev->nPageWrites = 0;
++	dev->nBlockErasures = 0;
++	dev->nGCCopies = 0;
++	dev->nRetriedWrites = 0;
++
++	dev->nRetiredBlocks = 0;
++
++	yaffs_VerifyFreeChunks(dev);
++	yaffs_VerifyBlocks(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 &&
++		    dev->srCache) {
++
++			for (i = 0; i < dev->nShortOpCaches; i++) {
++				if(dev->srCache[i].data)
++					YFREE(dev->srCache[i].data);
++				dev->srCache[i].data = NULL;
++			}
++
++			YFREE(dev->srCache);
++			dev->srCache = NULL;
++		}
++
++		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;
++	int difference;
++	
++	if(yaffs_SkipVerification(dev))
++		return;
++	
++	counted = yaffs_CountFreeChunks(dev);
++
++	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;
++}
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_guts.h linux-2.6.21.1.new/fs/yaffs2/yaffs_guts.h
+--- linux-2.6.21.1/fs/yaffs2/yaffs_guts.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_guts.h	2007-06-08 14:07:26.000000000 +0200
+@@ -0,0 +1,902 @@
++/*
++ * 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@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_CHECKPOINT_VERSION 	3
++
++#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
++
++/* We limit the number attempts at sucessfully saving a chunk of data.
++ * Small-page devices have 32 pages per block; large-page devices have 64.
++ * Default to something in the order of 5 to 10 blocks worth of chunks.
++ */
++#define YAFFS_WR_ATTEMPTS		(5*64)
++
++/* Sequence numbers are used in YAFFS2 to determine block allocation order.
++ * The range is limited slightly to help distinguish bad numbers from good.
++ * This also allows us to perhaps in the future use special numbers for
++ * special purposes.
++ * EFFFFF00 allows the allocation of 8 blocks 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;
++
++#define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL
++
++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;
++
++#define	YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1)
++
++
++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 blank 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 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. */
++	
++	/* Checkpoint control. Can be set before or after initialisation */
++	__u8 skipCheckpointRead;
++	__u8 skipCheckpointWrite;
++
++	/* 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;
++	__u32 checkpointSum;
++	__u32 checkpointXor;
++	
++	/* 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. */
++	int nonAggressiveSkip;	/* GC state/mode */
++
++	/* 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
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_mtdif.c linux-2.6.21.1.new/fs/yaffs2/yaffs_mtdif.c
+--- linux-2.6.21.1/fs/yaffs2/yaffs_mtdif.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_mtdif.c	2007-06-08 14:07:26.000000000 +0200
+@@ -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@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;
++}
++
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_mtdif.h linux-2.6.21.1.new/fs/yaffs2/yaffs_mtdif.h
+--- linux-2.6.21.1/fs/yaffs2/yaffs_mtdif.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_mtdif.h	2007-06-08 14:07:26.000000000 +0200
+@@ -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@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
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_mtdif1-compat.c linux-2.6.21.1.new/fs/yaffs2/yaffs_mtdif1-compat.c
+--- linux-2.6.21.1/fs/yaffs2/yaffs_mtdif1-compat.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_mtdif1-compat.c	2007-06-08 14:07:26.000000000 +0200
+@@ -0,0 +1,434 @@
++From ian@brightstareng.com Fri May 18 15:06:49 2007
++From ian@brightstareng.com Fri May 18 15:08:21 2007
++Received: from 206.173.66.57.ptr.us.xo.net ([206.173.66.57] helo=zebra.brightstareng.com)
++	by apollo.linkchoose.co.uk with esmtp (Exim 4.60)
++	(envelope-from <ian@brightstareng.com>)
++	id 1Hp380-00011e-T6
++	for david.goodenough@linkchoose.co.uk; Fri, 18 May 2007 15:08:21 +0100
++Received: from localhost (localhost.localdomain [127.0.0.1])
++	by zebra.brightstareng.com (Postfix) with ESMTP
++	id 4819F28C004; Fri, 18 May 2007 10:07:49 -0400 (EDT)
++Received: from zebra.brightstareng.com ([127.0.0.1])
++ by localhost (zebra [127.0.0.1]) (amavisd-new, port 10024) with ESMTP
++ id 05328-06; Fri, 18 May 2007 10:07:16 -0400 (EDT)
++Received: from pippin (unknown [192.168.1.25])
++	by zebra.brightstareng.com (Postfix) with ESMTP
++	id 8BEF528C1BC; Fri, 18 May 2007 10:06:53 -0400 (EDT)
++From: Ian McDonnell <ian@brightstareng.com>
++To: David Goodenough <david.goodenough@linkchoose.co.uk>
++Subject: Re: something tested this time -- yaffs_mtdif1-compat.c
++Date: Fri, 18 May 2007 10:06:49 -0400
++User-Agent: KMail/1.9.1
++References: <200705142207.06909.ian@brightstareng.com> <200705171131.53536.ian@brightstareng.com> <200705181334.32166.david.goodenough@linkchoose.co.uk>
++In-Reply-To: <200705181334.32166.david.goodenough@linkchoose.co.uk>
++Cc: Andrea Conti <alyf@alyf.net>,
++ Charles Manning <manningc2@actrix.gen.nz>
++MIME-Version: 1.0
++Content-Type: Multipart/Mixed;
++  boundary="Boundary-00=_5LbTGmt62YoutxM"
++Message-Id: <200705181006.49860.ian@brightstareng.com>
++X-Virus-Scanned: by amavisd-new at brightstareng.com
++Status: R
++X-Status: NT
++X-KMail-EncryptionState:  
++X-KMail-SignatureState:  
++X-KMail-MDN-Sent:  
++
++--Boundary-00=_5LbTGmt62YoutxM
++Content-Type: text/plain;
++  charset="iso-8859-15"
++Content-Transfer-Encoding: 7bit
++Content-Disposition: inline
++
++David, Andrea,
++
++On Friday 18 May 2007 08:34, you wrote:
++> Yea team.  With this fix in place (I put it in the wrong place
++> at first) I can now mount and ls the Yaffs partition without
++> an error messages!
++
++Good news!
++
++Attached is a newer yaffs_mtdif1.c with a bandaid to help the 
++2.6.18 and 2.6.19 versions of MTD not trip on the oob read.
++See the LINUX_VERSION_CODE conditional in 
++nandmtd1_ReadChunkWithTagsFromNAND.
++
++-imcd
++
++--Boundary-00=_5LbTGmt62YoutxM
++Content-Type: text/x-csrc;
++  charset="iso-8859-15";
++  name="yaffs_mtdif1.c"
++Content-Transfer-Encoding: 7bit
++Content-Disposition: attachment;
++	filename="yaffs_mtdif1.c"
++
++/*
++ * YAFFS: Yet another FFS. A NAND-flash specific file system.
++ * yaffs_mtdif1.c  NAND mtd interface functions for small-page NAND.
++ *
++ * Copyright (C) 2002 Aleph One Ltd.
++ *   for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * 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 module provides the interface between yaffs_nand.c and the
++ * MTD API.  This version is used when the MTD interface supports the
++ * 'mtd_oob_ops' style calls to read_oob and write_oob, circa 2.6.17,
++ * and we have small-page NAND device.
++ *
++ * These functions are invoked via function pointers in yaffs_nand.c.
++ * This replaces functionality provided by functions in yaffs_mtdif.c
++ * and the yaffs_TagsCompatability functions in yaffs_tagscompat.c that are
++ * called in yaffs_mtdif.c when the function pointers are NULL.
++ * We assume the MTD layer is performing ECC (useNANDECC is true).
++ */
++
++#include "yportenv.h"
++#include "yaffs_guts.h"
++#include "yaffs_packedtags1.h"
++#include "yaffs_tagscompat.h"	// for yaffs_CalcTagsECC
++
++#include "linux/kernel.h"
++#include "linux/version.h"
++#include "linux/types.h"
++#include "linux/mtd/mtd.h"
++
++/* Don't compile this module if we don't have MTD's mtd_oob_ops interface */
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++
++const char *yaffs_mtdif1_c_version = "$Id: yaffs_mtdif1.c,v 1.3 2007/05/15 20:16:11 ian Exp $";
++
++#ifndef CONFIG_YAFFS_9BYTE_TAGS
++# define YTAG1_SIZE 8
++#else
++# define YTAG1_SIZE 9
++#endif
++
++#if 0
++/* Use the following nand_ecclayout with MTD when using
++ * CONFIG_YAFFS_9BYTE_TAGS and the older on-NAND tags layout.
++ * If you have existing Yaffs images and the byte order differs from this,
++ * adjust 'oobfree' to match your existing Yaffs data.
++ *
++ * This nand_ecclayout scatters/gathers to/from the old-yaffs layout with the
++ * pageStatus byte (at NAND spare offset 4) scattered/gathered from/to
++ * the 9th byte.
++ *
++ * Old-style on-NAND format: T0,T1,T2,T3,P,B,T4,T5,E0,E1,E2,T6,T7,E3,E4,E5
++ * We have/need PackedTags1 plus pageStatus: T0,T1,T2,T3,T4,T5,T6,T7,P
++ * where Tn are the tag bytes, En are MTD's ECC bytes, P is the pageStatus
++ * byte and B is the small-page bad-block indicator byte.
++ */
++static struct nand_ecclayout nand_oob_16 = {
++	.eccbytes = 6,
++	.eccpos = { 8, 9, 10, 13, 14, 15 },
++	.oobavail = 9,
++	.oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
++};
++#endif
++
++/* Write a chunk (page) of data to NAND.
++ *
++ * Caller always provides ExtendedTags data which are converted to a more
++ * compact (packed) form for storage in NAND.  A mini-ECC runs over the
++ * contents of the tags meta-data; used to valid the tags when read.
++ *
++ *  - Pack ExtendedTags to PackedTags1 form
++ *  - Compute mini-ECC for PackedTags1
++ *  - Write data and packed tags to NAND.
++ *
++ * Note: Due to the use of the PackedTags1 meta-data which does not include
++ * a full sequence number (as found in the larger PackedTags2 form) it is
++ * necessary for Yaffs to re-write a chunk/page (just once) to mark it as
++ * discarded and dirty.  This is not ideal: newer NAND parts are supposed
++ * to be written just once.  When Yaffs performs this operation, this
++ * function is called with a NULL data pointer -- calling MTD write_oob
++ * without data is valid usage (2.6.17).
++ *
++ * Any underlying MTD error results in YAFFS_FAIL.
++ * Returns YAFFS_OK or YAFFS_FAIL.
++ */
++int nandmtd1_WriteChunkWithTagsToNAND(yaffs_Device *dev,
++	int chunkInNAND, const __u8 * data, const yaffs_ExtendedTags * etags)
++{
++	struct mtd_info * mtd = dev->genericDevice;
++	int chunkBytes = dev->nDataBytesPerChunk;
++	loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
++	struct mtd_oob_ops ops;
++	yaffs_PackedTags1 pt1;
++	int retval;
++
++	/* we assume that PackedTags1 and yaffs_Tags are compatible */
++	compile_time_assertion(sizeof(yaffs_PackedTags1) == 12);
++	compile_time_assertion(sizeof(yaffs_Tags) == 8);
++
++	yaffs_PackTags1(&pt1, etags);
++	yaffs_CalcTagsECC((yaffs_Tags *)&pt1);
++
++	/* When deleting a chunk, the upper layer provides only skeletal
++	 * etags, one with chunkDeleted set.  However, we need to update the
++	 * tags, not erase them completely.  So we use the NAND write property
++	 * that only zeroed-bits stick and set tag bytes to all-ones and
++	 * zero just the (not) deleted bit.
++	 */
++#ifndef CONFIG_YAFFS_9BYTE_TAGS
++	if (etags->chunkDeleted) {
++		memset(&pt1, 0xff, 8);
++		/* clear delete status bit to indicate deleted */
++		pt1.deleted = 0;
++	}
++#else
++	((__u8 *)&pt1)[8] = 0xff;
++	if (etags->chunkDeleted) {
++		memset(&pt1, 0xff, 8);
++		/* zero pageStatus byte to indicate deleted */
++		((__u8 *)&pt1)[8] = 0;
++	}
++#endif
++
++	memset(&ops, 0, sizeof(ops));
++	ops.mode = MTD_OOB_AUTO;
++	ops.len = (data) ? chunkBytes : 0;
++	ops.ooblen = YTAG1_SIZE;
++	ops.datbuf = (__u8 *)data;
++	ops.oobbuf = (__u8 *)&pt1;
++
++	retval = mtd->write_oob(mtd, addr, &ops);
++	if (retval) {
++		yaffs_trace(YAFFS_TRACE_MTD,
++			"write_oob failed, chunk %d, mtd error %d\n",
++			chunkInNAND, retval);
++	}
++	return retval ? YAFFS_FAIL : YAFFS_OK;
++}
++
++/* Return with empty ExtendedTags but add eccResult.
++ */
++static int rettags(yaffs_ExtendedTags * etags, int eccResult, int retval)
++{
++	if (etags) {
++		memset(etags, 0, sizeof(*etags));
++		etags->eccResult = eccResult;
++	}
++	return retval;
++}
++
++/* Read a chunk (page) from NAND.
++ *
++ * Caller expects ExtendedTags data to be usable even on error; that is,
++ * all members except eccResult and blockBad are zeroed.
++ *
++ *  - Check ECC results for data (if applicable)
++ *  - Check for blank/erased block (return empty ExtendedTags if blank)
++ *  - Check the PackedTags1 mini-ECC (correct if necessary/possible)
++ *  - Convert PackedTags1 to ExtendedTags
++ *  - Update eccResult and blockBad members to refect state.
++ *
++ * Returns YAFFS_OK or YAFFS_FAIL.
++ */
++int nandmtd1_ReadChunkWithTagsFromNAND(yaffs_Device *dev,
++	int chunkInNAND, __u8 * data, yaffs_ExtendedTags * etags)
++{
++	struct mtd_info * mtd = dev->genericDevice;
++	int chunkBytes = dev->nDataBytesPerChunk;
++	loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
++	int eccres = YAFFS_ECC_RESULT_NO_ERROR;
++	struct mtd_oob_ops ops;
++	yaffs_PackedTags1 pt1;
++	int retval;
++	int deleted;
++
++	memset(&ops, 0, sizeof(ops));
++	ops.mode = MTD_OOB_AUTO;
++	ops.len = (data) ? chunkBytes : 0;
++	ops.ooblen = YTAG1_SIZE;
++	ops.datbuf = data;
++	ops.oobbuf = (__u8 *)&pt1;
++
++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20))
++	/* In MTD 2.6.18 to 2.6.19 nand_base.c:nand_do_read_oob() has a bug;
++	 * help it out with ops.len = ops.ooblen when ops.datbuf == NULL.
++	 */
++	ops.len = (ops.datbuf) ? ops.len : ops.ooblen;
++#endif
++	/* Read page and oob using MTD.
++	 * Check status and determine ECC result.
++	 */
++	retval = mtd->read_oob(mtd, addr, &ops);
++	if (retval) {
++		yaffs_trace(YAFFS_TRACE_MTD,
++			"read_oob failed, chunk %d, mtd error %d\n",
++			chunkInNAND, retval);
++	}
++
++	switch (retval) {
++	case 0:
++		/* no error */
++		break;
++
++	case -EUCLEAN:
++		/* MTD's ECC fixed the data */
++		eccres = YAFFS_ECC_RESULT_FIXED;
++		dev->eccFixed++;
++		break;
++
++	case -EBADMSG:
++		/* MTD's ECC could not fix the data */
++		dev->eccUnfixed++;
++		/* fall into... */
++	default:
++		rettags(etags, YAFFS_ECC_RESULT_UNFIXED, 0);
++		etags->blockBad = (mtd->block_isbad)(mtd, addr);
++		return YAFFS_FAIL;
++	}
++
++	/* Check for a blank/erased chunk.
++	 */
++	if (yaffs_CheckFF((__u8 *)&pt1, 8)) {
++		/* when blank, upper layers want eccResult to be <= NO_ERROR */
++		return rettags(etags, YAFFS_ECC_RESULT_NO_ERROR, YAFFS_OK);
++	}
++
++#ifndef CONFIG_YAFFS_9BYTE_TAGS
++	/* Read deleted status (bit) then return it to it's non-deleted
++	 * state before performing tags mini-ECC check. pt1.deleted is
++	 * inverted.
++	 */
++	deleted = !pt1.deleted;
++	pt1.deleted = 1;
++#else
++	(void) deleted; /* not used */
++#endif
++
++	/* Check the packed tags mini-ECC and correct if necessary/possible.
++	 */
++	retval = yaffs_CheckECCOnTags((yaffs_Tags *)&pt1);
++	switch (retval) {
++	case 0:
++		/* no tags error, use MTD result */
++		break;
++	case 1:
++		/* recovered tags-ECC error */
++		dev->tagsEccFixed++;
++		eccres = YAFFS_ECC_RESULT_FIXED;
++		break;
++	default:
++		/* unrecovered tags-ECC error */
++		dev->tagsEccUnfixed++;
++		return rettags(etags, YAFFS_ECC_RESULT_UNFIXED, YAFFS_FAIL);
++	}
++
++	/* Unpack the tags to extended form and set ECC result.
++	 * [set shouldBeFF just to keep yaffs_UnpackTags1 happy]
++	 */
++	pt1.shouldBeFF = 0xFFFFFFFF;
++	yaffs_UnpackTags1(etags, &pt1);
++	etags->eccResult = eccres;
++
++	/* Set deleted state.
++	 */
++#ifndef CONFIG_YAFFS_9BYTE_TAGS
++	etags->chunkDeleted = deleted;
++#else
++	etags->chunkDeleted = (yaffs_CountBits(((__u8 *)&pt1)[8]) < 7);
++#endif
++	return YAFFS_OK;
++}
++
++/* Mark a block bad.
++ *
++ * This is a persistant state.
++ * Use of this function should be rare.
++ *
++ * Returns YAFFS_OK or YAFFS_FAIL.
++ */
++int nandmtd1_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
++{
++	struct mtd_info * mtd = dev->genericDevice;
++	int blocksize = dev->nChunksPerBlock * dev->nDataBytesPerChunk;
++	int retval;
++
++	yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad", blockNo);
++
++	retval = mtd->block_markbad(mtd, (loff_t)blocksize * blockNo);
++	return (retval) ? YAFFS_FAIL : YAFFS_OK;
++}
++
++/* Check any MTD prerequists.
++ * 
++ * Returns YAFFS_OK or YAFFS_FAIL.
++ */
++static int nandmtd1_TestPrerequists(struct mtd_info * mtd)
++{
++	/* 2.6.18 has mtd->ecclayout->oobavail */
++	/* 2.6.21 has mtd->ecclayout->oobavail and mtd->oobavail */
++	int oobavail = mtd->ecclayout->oobavail;
++
++	if (oobavail < YTAG1_SIZE) {
++		yaffs_trace(YAFFS_TRACE_ERROR,
++			"mtd device has only %d bytes for tags, need %d",
++			oobavail, YTAG1_SIZE);
++		return YAFFS_FAIL;
++	}
++	return YAFFS_OK;
++}
++
++/* Query for the current state of a specific block.
++ *
++ * Examine the tags of the first chunk of the block and return the state:
++ *  - YAFFS_BLOCK_STATE_DEAD, the block is marked bad
++ *  - YAFFS_BLOCK_STATE_NEEDS_SCANNING, the block is in use
++ *  - YAFFS_BLOCK_STATE_EMPTY, the block is clean
++ *
++ * Always returns YAFFS_OK.
++ */
++int nandmtd1_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
++	yaffs_BlockState * pState, int *pSequenceNumber)
++{
++	struct mtd_info * mtd = dev->genericDevice;
++	int chunkNo = blockNo * dev->nChunksPerBlock;
++	yaffs_ExtendedTags etags;
++	int state = YAFFS_BLOCK_STATE_DEAD;
++	int seqnum = 0;
++	int retval;
++
++	/* We don't yet have a good place to test for MTD config prerequists.
++	 * Do it here as we are called during the initial scan.
++	 */
++	if (nandmtd1_TestPrerequists(mtd) != YAFFS_OK) {
++		return YAFFS_FAIL;
++	}
++
++	retval = nandmtd1_ReadChunkWithTagsFromNAND(dev, chunkNo, NULL, &etags);
++	if (etags.blockBad) {
++		yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
++			"block %d is marked bad", blockNo);
++		state = YAFFS_BLOCK_STATE_DEAD;
++	}
++	else if (etags.chunkUsed) {
++		state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
++		seqnum = etags.sequenceNumber;
++	}
++	else {
++		state = YAFFS_BLOCK_STATE_EMPTY;
++	}
++
++	*pState = state;
++	*pSequenceNumber = seqnum;
++
++	/* query always succeeds */
++	return YAFFS_OK;
++}
++
++#endif /*KERNEL_VERSION*/
++
++--Boundary-00=_5LbTGmt62YoutxM--
++
++
++
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_mtdif1.c linux-2.6.21.1.new/fs/yaffs2/yaffs_mtdif1.c
+--- linux-2.6.21.1/fs/yaffs2/yaffs_mtdif1.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_mtdif1.c	2007-06-08 14:07:26.000000000 +0200
+@@ -0,0 +1,363 @@
++/*
++ * YAFFS: Yet another FFS. A NAND-flash specific file system.
++ * yaffs_mtdif1.c  NAND mtd interface functions for small-page NAND.
++ *
++ * Copyright (C) 2002 Aleph One Ltd.
++ *   for Toby Churchill Ltd and Brightstar Engineering
++ *
++ * 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 module provides the interface between yaffs_nand.c and the
++ * MTD API.  This version is used when the MTD interface supports the
++ * 'mtd_oob_ops' style calls to read_oob and write_oob, circa 2.6.17,
++ * and we have small-page NAND device.
++ *
++ * These functions are invoked via function pointers in yaffs_nand.c.
++ * This replaces functionality provided by functions in yaffs_mtdif.c
++ * and the yaffs_TagsCompatability functions in yaffs_tagscompat.c that are
++ * called in yaffs_mtdif.c when the function pointers are NULL.
++ * We assume the MTD layer is performing ECC (useNANDECC is true).
++ */
++
++#include "yportenv.h"
++#include "yaffs_guts.h"
++#include "yaffs_packedtags1.h"
++#include "yaffs_tagscompat.h"	// for yaffs_CalcTagsECC
++
++#include "linux/kernel.h"
++#include "linux/version.h"
++#include "linux/types.h"
++#include "linux/mtd/mtd.h"
++
++/* Don't compile this module if we don't have MTD's mtd_oob_ops interface */
++#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
++
++const char *yaffs_mtdif1_c_version = "$Id: yaffs_mtdif1.c,v 1.3 2007/05/15 20:16:11 ian Exp $";
++
++#ifndef CONFIG_YAFFS_9BYTE_TAGS
++# define YTAG1_SIZE 8
++#else
++# define YTAG1_SIZE 9
++#endif
++
++#if 0
++/* Use the following nand_ecclayout with MTD when using
++ * CONFIG_YAFFS_9BYTE_TAGS and the older on-NAND tags layout.
++ * If you have existing Yaffs images and the byte order differs from this,
++ * adjust 'oobfree' to match your existing Yaffs data.
++ *
++ * This nand_ecclayout scatters/gathers to/from the old-yaffs layout with the
++ * pageStatus byte (at NAND spare offset 4) scattered/gathered from/to
++ * the 9th byte.
++ *
++ * Old-style on-NAND format: T0,T1,T2,T3,P,B,T4,T5,E0,E1,E2,T6,T7,E3,E4,E5
++ * We have/need PackedTags1 plus pageStatus: T0,T1,T2,T3,T4,T5,T6,T7,P
++ * where Tn are the tag bytes, En are MTD's ECC bytes, P is the pageStatus
++ * byte and B is the small-page bad-block indicator byte.
++ */
++static struct nand_ecclayout nand_oob_16 = {
++	.eccbytes = 6,
++	.eccpos = { 8, 9, 10, 13, 14, 15 },
++	.oobavail = 9,
++	.oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
++};
++#endif
++
++/* Write a chunk (page) of data to NAND.
++ *
++ * Caller always provides ExtendedTags data which are converted to a more
++ * compact (packed) form for storage in NAND.  A mini-ECC runs over the
++ * contents of the tags meta-data; used to valid the tags when read.
++ *
++ *  - Pack ExtendedTags to PackedTags1 form
++ *  - Compute mini-ECC for PackedTags1
++ *  - Write data and packed tags to NAND.
++ *
++ * Note: Due to the use of the PackedTags1 meta-data which does not include
++ * a full sequence number (as found in the larger PackedTags2 form) it is
++ * necessary for Yaffs to re-write a chunk/page (just once) to mark it as
++ * discarded and dirty.  This is not ideal: newer NAND parts are supposed
++ * to be written just once.  When Yaffs performs this operation, this
++ * function is called with a NULL data pointer -- calling MTD write_oob
++ * without data is valid usage (2.6.17).
++ *
++ * Any underlying MTD error results in YAFFS_FAIL.
++ * Returns YAFFS_OK or YAFFS_FAIL.
++ */
++int nandmtd1_WriteChunkWithTagsToNAND(yaffs_Device *dev,
++	int chunkInNAND, const __u8 * data, const yaffs_ExtendedTags * etags)
++{
++	struct mtd_info * mtd = dev->genericDevice;
++	int chunkBytes = dev->nDataBytesPerChunk;
++	loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
++	struct mtd_oob_ops ops;
++	yaffs_PackedTags1 pt1;
++	int retval;
++
++	/* we assume that PackedTags1 and yaffs_Tags are compatible */
++	compile_time_assertion(sizeof(yaffs_PackedTags1) == 12);
++	compile_time_assertion(sizeof(yaffs_Tags) == 8);
++
++	dev->nPageWrites++;
++
++	yaffs_PackTags1(&pt1, etags);
++	yaffs_CalcTagsECC((yaffs_Tags *)&pt1);
++
++	/* When deleting a chunk, the upper layer provides only skeletal
++	 * etags, one with chunkDeleted set.  However, we need to update the
++	 * tags, not erase them completely.  So we use the NAND write property
++	 * that only zeroed-bits stick and set tag bytes to all-ones and
++	 * zero just the (not) deleted bit.
++	 */
++#ifndef CONFIG_YAFFS_9BYTE_TAGS
++	if (etags->chunkDeleted) {
++		memset(&pt1, 0xff, 8);
++		/* clear delete status bit to indicate deleted */
++		pt1.deleted = 0;
++	}
++#else
++	((__u8 *)&pt1)[8] = 0xff;
++	if (etags->chunkDeleted) {
++		memset(&pt1, 0xff, 8);
++		/* zero pageStatus byte to indicate deleted */
++		((__u8 *)&pt1)[8] = 0;
++	}
++#endif
++
++	memset(&ops, 0, sizeof(ops));
++	ops.mode = MTD_OOB_AUTO;
++	ops.len = (data) ? chunkBytes : 0;
++	ops.ooblen = YTAG1_SIZE;
++	ops.datbuf = (__u8 *)data;
++	ops.oobbuf = (__u8 *)&pt1;
++
++	retval = mtd->write_oob(mtd, addr, &ops);
++	if (retval) {
++		yaffs_trace(YAFFS_TRACE_MTD,
++			"write_oob failed, chunk %d, mtd error %d\n",
++			chunkInNAND, retval);
++	}
++	return retval ? YAFFS_FAIL : YAFFS_OK;
++}
++
++/* Return with empty ExtendedTags but add eccResult.
++ */
++static int rettags(yaffs_ExtendedTags * etags, int eccResult, int retval)
++{
++	if (etags) {
++		memset(etags, 0, sizeof(*etags));
++		etags->eccResult = eccResult;
++	}
++	return retval;
++}
++
++/* Read a chunk (page) from NAND.
++ *
++ * Caller expects ExtendedTags data to be usable even on error; that is,
++ * all members except eccResult and blockBad are zeroed.
++ *
++ *  - Check ECC results for data (if applicable)
++ *  - Check for blank/erased block (return empty ExtendedTags if blank)
++ *  - Check the PackedTags1 mini-ECC (correct if necessary/possible)
++ *  - Convert PackedTags1 to ExtendedTags
++ *  - Update eccResult and blockBad members to refect state.
++ *
++ * Returns YAFFS_OK or YAFFS_FAIL.
++ */
++int nandmtd1_ReadChunkWithTagsFromNAND(yaffs_Device *dev,
++	int chunkInNAND, __u8 * data, yaffs_ExtendedTags * etags)
++{
++	struct mtd_info * mtd = dev->genericDevice;
++	int chunkBytes = dev->nDataBytesPerChunk;
++	loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
++	int eccres = YAFFS_ECC_RESULT_NO_ERROR;
++	struct mtd_oob_ops ops;
++	yaffs_PackedTags1 pt1;
++	int retval;
++	int deleted;
++
++	dev->nPageReads++;
++
++	memset(&ops, 0, sizeof(ops));
++	ops.mode = MTD_OOB_AUTO;
++	ops.len = (data) ? chunkBytes : 0;
++	ops.ooblen = YTAG1_SIZE;
++	ops.datbuf = data;
++	ops.oobbuf = (__u8 *)&pt1;
++
++#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20))
++	/* In MTD 2.6.18 to 2.6.19 nand_base.c:nand_do_read_oob() has a bug;
++	 * help it out with ops.len = ops.ooblen when ops.datbuf == NULL.
++	 */
++	ops.len = (ops.datbuf) ? ops.len : ops.ooblen;
++#endif
++	/* Read page and oob using MTD.
++	 * Check status and determine ECC result.
++	 */
++	retval = mtd->read_oob(mtd, addr, &ops);
++	if (retval) {
++		yaffs_trace(YAFFS_TRACE_MTD,
++			"read_oob failed, chunk %d, mtd error %d\n",
++			chunkInNAND, retval);
++	}
++
++	switch (retval) {
++	case 0:
++		/* no error */
++		break;
++
++	case -EUCLEAN:
++		/* MTD's ECC fixed the data */
++		eccres = YAFFS_ECC_RESULT_FIXED;
++		dev->eccFixed++;
++		break;
++
++	case -EBADMSG:
++		/* MTD's ECC could not fix the data */
++		dev->eccUnfixed++;
++		/* fall into... */
++	default:
++		rettags(etags, YAFFS_ECC_RESULT_UNFIXED, 0);
++		etags->blockBad = (mtd->block_isbad)(mtd, addr);
++		return YAFFS_FAIL;
++	}
++
++	/* Check for a blank/erased chunk.
++	 */
++	if (yaffs_CheckFF((__u8 *)&pt1, 8)) {
++		/* when blank, upper layers want eccResult to be <= NO_ERROR */
++		return rettags(etags, YAFFS_ECC_RESULT_NO_ERROR, YAFFS_OK);
++	}
++
++#ifndef CONFIG_YAFFS_9BYTE_TAGS
++	/* Read deleted status (bit) then return it to it's non-deleted
++	 * state before performing tags mini-ECC check. pt1.deleted is
++	 * inverted.
++	 */
++	deleted = !pt1.deleted;
++	pt1.deleted = 1;
++#else
++	deleted = (yaffs_CountBits(((__u8 *)&pt1)[8]) < 7);
++#endif
++
++	/* Check the packed tags mini-ECC and correct if necessary/possible.
++	 */
++	retval = yaffs_CheckECCOnTags((yaffs_Tags *)&pt1);
++	switch (retval) {
++	case 0:
++		/* no tags error, use MTD result */
++		break;
++	case 1:
++		/* recovered tags-ECC error */
++		dev->tagsEccFixed++;
++		if (eccres == YAFFS_ECC_RESULT_NO_ERROR)
++			eccres = YAFFS_ECC_RESULT_FIXED;
++		break;
++	default:
++		/* unrecovered tags-ECC error */
++		dev->tagsEccUnfixed++;
++		return rettags(etags, YAFFS_ECC_RESULT_UNFIXED, YAFFS_FAIL);
++	}
++
++	/* Unpack the tags to extended form and set ECC result.
++	 * [set shouldBeFF just to keep yaffs_UnpackTags1 happy]
++	 */
++	pt1.shouldBeFF = 0xFFFFFFFF;
++	yaffs_UnpackTags1(etags, &pt1);
++	etags->eccResult = eccres;
++
++	/* Set deleted state */
++	etags->chunkDeleted = deleted;
++	return YAFFS_OK;
++}
++
++/* Mark a block bad.
++ *
++ * This is a persistant state.
++ * Use of this function should be rare.
++ *
++ * Returns YAFFS_OK or YAFFS_FAIL.
++ */
++int nandmtd1_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
++{
++	struct mtd_info * mtd = dev->genericDevice;
++	int blocksize = dev->nChunksPerBlock * dev->nDataBytesPerChunk;
++	int retval;
++
++	yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad", blockNo);
++
++	retval = mtd->block_markbad(mtd, (loff_t)blocksize * blockNo);
++	return (retval) ? YAFFS_FAIL : YAFFS_OK;
++}
++
++/* Check any MTD prerequists.
++ * 
++ * Returns YAFFS_OK or YAFFS_FAIL.
++ */
++static int nandmtd1_TestPrerequists(struct mtd_info * mtd)
++{
++	/* 2.6.18 has mtd->ecclayout->oobavail */
++	/* 2.6.21 has mtd->ecclayout->oobavail and mtd->oobavail */
++	int oobavail = mtd->ecclayout->oobavail;
++
++	if (oobavail < YTAG1_SIZE) {
++		yaffs_trace(YAFFS_TRACE_ERROR,
++			"mtd device has only %d bytes for tags, need %d\n",
++			oobavail, YTAG1_SIZE);
++		return YAFFS_FAIL;
++	}
++	return YAFFS_OK;
++}
++
++/* Query for the current state of a specific block.
++ *
++ * Examine the tags of the first chunk of the block and return the state:
++ *  - YAFFS_BLOCK_STATE_DEAD, the block is marked bad
++ *  - YAFFS_BLOCK_STATE_NEEDS_SCANNING, the block is in use
++ *  - YAFFS_BLOCK_STATE_EMPTY, the block is clean
++ *
++ * Always returns YAFFS_OK.
++ */
++int nandmtd1_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
++	yaffs_BlockState * pState, int *pSequenceNumber)
++{
++	struct mtd_info * mtd = dev->genericDevice;
++	int chunkNo = blockNo * dev->nChunksPerBlock;
++	yaffs_ExtendedTags etags;
++	int state = YAFFS_BLOCK_STATE_DEAD;
++	int seqnum = 0;
++	int retval;
++
++	/* We don't yet have a good place to test for MTD config prerequists.
++	 * Do it here as we are called during the initial scan.
++	 */
++	if (nandmtd1_TestPrerequists(mtd) != YAFFS_OK) {
++		return YAFFS_FAIL;
++	}
++
++	retval = nandmtd1_ReadChunkWithTagsFromNAND(dev, chunkNo, NULL, &etags);
++	if (etags.blockBad) {
++		yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
++			"block %d is marked bad", blockNo);
++		state = YAFFS_BLOCK_STATE_DEAD;
++	}
++	else if (etags.chunkUsed) {
++		state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
++		seqnum = etags.sequenceNumber;
++	}
++	else {
++		state = YAFFS_BLOCK_STATE_EMPTY;
++	}
++
++	*pState = state;
++	*pSequenceNumber = seqnum;
++
++	/* query always succeeds */
++	return YAFFS_OK;
++}
++
++#endif /*KERNEL_VERSION*/
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_mtdif1.h linux-2.6.21.1.new/fs/yaffs2/yaffs_mtdif1.h
+--- linux-2.6.21.1/fs/yaffs2/yaffs_mtdif1.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_mtdif1.h	2007-06-08 14:07:26.000000000 +0200
+@@ -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
++ *
++ * 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_MTDIF1_H__
++#define __YAFFS_MTDIF1_H__
++
++int nandmtd1_WriteChunkWithTagsToNAND(yaffs_Device * dev, int chunkInNAND,
++	const __u8 * data, const yaffs_ExtendedTags * tags);
++
++int nandmtd1_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
++	__u8 * data, yaffs_ExtendedTags * tags);
++
++int nandmtd1_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo);
++
++int nandmtd1_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
++	yaffs_BlockState * state, int *sequenceNumber);
++
++#endif
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_mtdif2.c linux-2.6.21.1.new/fs/yaffs2/yaffs_mtdif2.c
+--- linux-2.6.21.1/fs/yaffs2/yaffs_mtdif2.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_mtdif2.c	2007-06-08 14:07:26.000000000 +0200
+@@ -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@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;
++}
++
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_mtdif2.h linux-2.6.21.1.new/fs/yaffs2/yaffs_mtdif2.h
+--- linux-2.6.21.1/fs/yaffs2/yaffs_mtdif2.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_mtdif2.h	2007-06-08 14:07:26.000000000 +0200
+@@ -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@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
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_nand.c linux-2.6.21.1.new/fs/yaffs2/yaffs_nand.c
+--- linux-2.6.21.1/fs/yaffs2/yaffs_nand.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_nand.c	2007-06-08 14:07:26.000000000 +0200
+@@ -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@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);
++}
++
++
++ 
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_nand.h linux-2.6.21.1.new/fs/yaffs2/yaffs_nand.h
+--- linux-2.6.21.1/fs/yaffs2/yaffs_nand.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_nand.h	2007-06-08 14:07:26.000000000 +0200
+@@ -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@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
++
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_nandemul2k.h linux-2.6.21.1.new/fs/yaffs2/yaffs_nandemul2k.h
+--- linux-2.6.21.1/fs/yaffs2/yaffs_nandemul2k.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_nandemul2k.h	2007-06-08 14:07:26.000000000 +0200
+@@ -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@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
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_packedtags1.c linux-2.6.21.1.new/fs/yaffs2/yaffs_packedtags1.c
+--- linux-2.6.21.1/fs/yaffs2/yaffs_packedtags1.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_packedtags1.c	2007-06-08 14:07:26.000000000 +0200
+@@ -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@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));
++
++	}
++}
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_packedtags1.h linux-2.6.21.1.new/fs/yaffs2/yaffs_packedtags1.h
+--- linux-2.6.21.1/fs/yaffs2/yaffs_packedtags1.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_packedtags1.h	2007-06-08 14:07:27.000000000 +0200
+@@ -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@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
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_packedtags2.c linux-2.6.21.1.new/fs/yaffs2/yaffs_packedtags2.c
+--- linux-2.6.21.1/fs/yaffs2/yaffs_packedtags2.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_packedtags2.c	2007-06-08 14:07:27.000000000 +0200
+@@ -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@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);
++
++}
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_packedtags2.h linux-2.6.21.1.new/fs/yaffs2/yaffs_packedtags2.h
+--- linux-2.6.21.1/fs/yaffs2/yaffs_packedtags2.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_packedtags2.h	2007-06-08 14:07:27.000000000 +0200
+@@ -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@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
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_qsort.c linux-2.6.21.1.new/fs/yaffs2/yaffs_qsort.c
+--- linux-2.6.21.1/fs/yaffs2/yaffs_qsort.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_qsort.c	2007-06-08 14:07:27.000000000 +0200
+@@ -0,0 +1,160 @@
++/*
++ * 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 ));
++}
++
++#ifndef min
++#define min(a,b) (((a) < (b)) ? (a) : (b))
++#endif
++
++void
++yaffs_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)
++		yaffs_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;
++	}
++/*		yaffs_qsort(pn - r, r / es, es, cmp);*/
++}
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_qsort.h linux-2.6.21.1.new/fs/yaffs2/yaffs_qsort.h
+--- linux-2.6.21.1/fs/yaffs2/yaffs_qsort.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_qsort.h	2007-06-08 14:07:27.000000000 +0200
+@@ -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@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 yaffs_qsort (void *const base, size_t total_elems, size_t size,
++                   int (*cmp)(const void *, const void *));
++
++#endif
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_tagscompat.c linux-2.6.21.1.new/fs/yaffs2/yaffs_tagscompat.c
+--- linux-2.6.21.1/fs/yaffs2/yaffs_tagscompat.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_tagscompat.c	2007-06-08 14:07:27.000000000 +0200
+@@ -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@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
++};
++
++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;
++}
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_tagscompat.h linux-2.6.21.1.new/fs/yaffs2/yaffs_tagscompat.h
+--- linux-2.6.21.1/fs/yaffs2/yaffs_tagscompat.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_tagscompat.h	2007-06-08 14:07:27.000000000 +0200
+@@ -0,0 +1,40 @@
++/*
++ * 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@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);
++
++void yaffs_CalcTagsECC(yaffs_Tags * tags);
++int yaffs_CheckECCOnTags(yaffs_Tags * tags);
++int yaffs_CountBits(__u8 byte);
++
++#endif
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_tagsvalidity.c linux-2.6.21.1.new/fs/yaffs2/yaffs_tagsvalidity.c
+--- linux-2.6.21.1/fs/yaffs2/yaffs_tagsvalidity.c	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_tagsvalidity.c	2007-06-08 14:07:27.000000000 +0200
+@@ -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@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);
++
++}
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffs_tagsvalidity.h linux-2.6.21.1.new/fs/yaffs2/yaffs_tagsvalidity.h
+--- linux-2.6.21.1/fs/yaffs2/yaffs_tagsvalidity.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffs_tagsvalidity.h	2007-06-08 14:07:27.000000000 +0200
+@@ -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@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
+diff -urN linux-2.6.21.1/fs/yaffs2/yaffsinterface.h linux-2.6.21.1.new/fs/yaffs2/yaffsinterface.h
+--- linux-2.6.21.1/fs/yaffs2/yaffsinterface.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yaffsinterface.h	2007-06-08 14:07:26.000000000 +0200
+@@ -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@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
+diff -urN linux-2.6.21.1/fs/yaffs2/yportenv.h linux-2.6.21.1.new/fs/yaffs2/yportenv.h
+--- linux-2.6.21.1/fs/yaffs2/yportenv.h	1970-01-01 01:00:00.000000000 +0100
++++ linux-2.6.21.1.new/fs/yaffs2/yportenv.h	2007-06-08 14:07:27.000000000 +0200
+@@ -0,0 +1,186 @@
++/*
++ * 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@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_strncmp(a,b,c) strncmp(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
++
++#define yaffs_trace(mask, fmt, args...) \
++	do { if ((mask) & (yaffs_traceMask|YAFFS_TRACE_ERROR)) \
++		printk(KERN_WARNING "yaffs: " fmt, ## args); \
++	} while (0)
++
++#define compile_time_assertion(assertion) \
++	({ int x = __builtin_choose_expr(assertion, 0, (void)0); (void) x; })
++
++#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
++
++/* see yaffs_fs.c */
++extern unsigned int yaffs_traceMask;
++extern unsigned int yaffs_wr_attempts;
++
++/*
++ * Tracing flags.
++ * The flags masked in YAFFS_TRACE_ALWAYS are always traced.
++ */
++ 
++#define YAFFS_TRACE_OS			0x00000002
++#define YAFFS_TRACE_ALLOCATE		0x00000004
++#define YAFFS_TRACE_SCAN		0x00000008
++#define YAFFS_TRACE_BAD_BLOCKS		0x00000010
++#define YAFFS_TRACE_ERASE		0x00000020
++#define YAFFS_TRACE_GC			0x00000040
++#define YAFFS_TRACE_WRITE		0x00000080
++#define YAFFS_TRACE_TRACING		0x00000100
++#define YAFFS_TRACE_DELETION		0x00000200
++#define YAFFS_TRACE_BUFFERS		0x00000400
++#define YAFFS_TRACE_NANDACCESS		0x00000800
++#define YAFFS_TRACE_GC_DETAIL		0x00001000
++#define YAFFS_TRACE_SCAN_DEBUG		0x00002000
++#define YAFFS_TRACE_MTD			0x00004000
++#define YAFFS_TRACE_CHECKPOINT		0x00008000
++
++#define YAFFS_TRACE_VERIFY		0x00010000
++#define YAFFS_TRACE_VERIFY_NAND		0x00020000
++#define YAFFS_TRACE_VERIFY_FULL		0x00040000
++#define YAFFS_TRACE_VERIFY_ALL		0x000F0000
++
++
++#define YAFFS_TRACE_ERROR		0x40000000
++#define YAFFS_TRACE_BUG			0x80000000
++#define YAFFS_TRACE_ALWAYS		0xF0000000
++
++
++#define T(mask,p) do{ if((mask) & (yaffs_traceMask | YAFFS_TRACE_ALWAYS)) TOUT(p);} while(0)
++
++#ifndef CONFIG_YAFFS_WINCE
++#define YBUG() T(YAFFS_TRACE_BUG,(TSTR("==>> yaffs bug: " __FILE__ " %d" TENDSTR),__LINE__))
++#endif
++
++#endif