fs:yaffs2: filesystem with stable YAFFS2 release

Yaffs2 update is required for making it build with
linux-2.6.36 kernel.

(cherry picked from commit 801807856be210442c88812b357f4b83fe79b344)

Change-Id: I120b262b203c751e1730914ce3b5e6656930bd20
Reviewed-on: http://git-master/r/39783
Reviewed-by: Venu Byravarasu <vbyravarasu@nvidia.com>
Tested-by: Manoj Chourasia <mchourasia@nvidia.com>
Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>

30 files changed, 5068 insertions, 3445 deletions

diff --git a/fs/yaffs2/Kconfig b/fs/yaffs2/Kconfig
index d4363edcdbfe..7b3988c3a014 100644
--- a/fs/yaffs2/Kconfig
+++ b/fs/yaffs2/Kconfig
@@ -178,3 +178,13 @@ config YAFFS_DISABLE_BACKGROUND
 	 Background processing makes many foreground activities faster.
 
 	  If unsure, say N.
+
+config YAFFS_XATTR
+	bool "Enable yaffs2 xattr support"
+	depends on YAFFS_FS
+	default y
+	help
+	 If this is set then yaffs2 will provide xattr support.
+	 If unsure, say Y.
+
+
diff --git a/fs/yaffs2/Makefile b/fs/yaffs2/Makefile
index 382ee6142cf6..fbdbd4a019d3 100644
--- a/fs/yaffs2/Makefile
+++ b/fs/yaffs2/Makefile
@@ -4,7 +4,14 @@
 
 obj-$(CONFIG_YAFFS_FS) += yaffs.o
 
-yaffs-y := yaffs_ecc.o yaffs_fs.o yaffs_guts.o yaffs_checkptrw.o
-yaffs-y += yaffs_packedtags1.o yaffs_packedtags2.o yaffs_nand.o yaffs_qsort.o
+yaffs-y := yaffs_ecc.o yaffs_vfs_glue.o yaffs_guts.o yaffs_checkptrw.o
+yaffs-y += yaffs_packedtags1.o yaffs_packedtags2.o yaffs_nand.o
 yaffs-y += yaffs_tagscompat.o yaffs_tagsvalidity.o
 yaffs-y += yaffs_mtdif.o yaffs_mtdif1.o yaffs_mtdif2.o
+yaffs-y += yaffs_nameval.o
+yaffs-y += yaffs_allocator.o
+yaffs-y += yaffs_yaffs1.o
+yaffs-y += yaffs_yaffs2.o
+yaffs-y += yaffs_bitmap.o
+yaffs-y += yaffs_verify.o
+
diff --git a/fs/yaffs2/devextras.h b/fs/yaffs2/devextras.h
index 215caa50f178..ce30c820d938 100644
--- a/fs/yaffs2/devextras.h
+++ b/fs/yaffs2/devextras.h
@@ -24,6 +24,8 @@
 #define __EXTRAS_H__
 
 
+#include "yportenv.h"
+
 #if !(defined __KERNEL__)
 
 /* Definition of types */
@@ -33,103 +35,6 @@ typedef unsigned __u32;
 
 #endif
 
-/*
- * This is a simple doubly linked list implementation that matches the
- * way the Linux kernel doubly linked list implementation works.
- */
-
-struct ylist_head {
-	struct ylist_head *next; /* next in chain */
-	struct ylist_head *prev; /* previous in chain */
-};
-
-
-/* Initialise a static list */
-#define YLIST_HEAD(name) \
-struct ylist_head name = { &(name), &(name)}
-
-
-
-/* Initialise a list head to an empty list */
-#define YINIT_LIST_HEAD(p) \
-do { \
-	(p)->next = (p);\
-	(p)->prev = (p); \
-} while (0)
-
-
-/* Add an element to a list */
-static __inline__ void ylist_add(struct ylist_head *newEntry,
-				struct ylist_head *list)
-{
-	struct ylist_head *listNext = list->next;
-
-	list->next = newEntry;
-	newEntry->prev = list;
-	newEntry->next = listNext;
-	listNext->prev = newEntry;
-
-}
-
-static __inline__ void ylist_add_tail(struct ylist_head *newEntry,
-				 struct ylist_head *list)
-{
-	struct ylist_head *listPrev = list->prev;
-
-	list->prev = newEntry;
-	newEntry->next = list;
-	newEntry->prev = listPrev;
-	listPrev->next = newEntry;
-
-}
-
-
-/* Take an element out of its current list, with or without
- * reinitialising the links.of the entry*/
-static __inline__ void ylist_del(struct ylist_head *entry)
-{
-	struct ylist_head *listNext = entry->next;
-	struct ylist_head *listPrev = entry->prev;
-
-	listNext->prev = listPrev;
-	listPrev->next = listNext;
-
-}
-
-static __inline__ void ylist_del_init(struct ylist_head *entry)
-{
-	ylist_del(entry);
-	entry->next = entry->prev = entry;
-}
-
-
-/* Test if the list is empty */
-static __inline__ int ylist_empty(struct ylist_head *entry)
-{
-	return (entry->next == entry);
-}
-
-
-/* ylist_entry takes a pointer to a list entry and offsets it to that
- * we can find a pointer to the object it is embedded in.
- */
-
-
-#define ylist_entry(entry, type, member) \
-	((type *)((char *)(entry)-(unsigned long)(&((type *)NULL)->member)))
-
-
-/* ylist_for_each and list_for_each_safe  iterate over lists.
- * ylist_for_each_safe uses temporary storage to make the list delete safe
- */
-
-#define ylist_for_each(itervar, list) \
-	for (itervar = (list)->next; itervar != (list); itervar = itervar->next)
-
-#define ylist_for_each_safe(itervar, saveVar, list) \
-	for (itervar = (list)->next, saveVar = (list)->next->next; \
-		itervar != (list); itervar = saveVar, saveVar = saveVar->next)
-
 
 #if !(defined __KERNEL__)
 
diff --git a/fs/yaffs2/moduleconfig.h b/fs/yaffs2/moduleconfig.h
index e8efd67586a7..43f11447601d 100644
--- a/fs/yaffs2/moduleconfig.h
+++ b/fs/yaffs2/moduleconfig.h
@@ -63,6 +63,10 @@
 /* #define CONFIG_DISABLE_BACKGROUND */
 
 
+/* Default: Selected */
+/* Meaning: Enable XATTR support */
+#define CONFIG_YAFFS_XATTR
+
 /*
 Older-style on-NAND data format has a "pageStatus" byte to record
 chunk/page state.  This byte is zeroed when the page is discarded.
diff --git a/fs/yaffs2/yaffs_allocator.c b/fs/yaffs2/yaffs_allocator.c
new file mode 100644
index 000000000000..a284439cfa62
--- /dev/null
+++ b/fs/yaffs2/yaffs_allocator.c
@@ -0,0 +1,408 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+
+
+#include "yaffs_allocator.h"
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yportenv.h"
+
+#ifdef CONFIG_YAFFS_YMALLOC_ALLOCATOR
+
+void yaffs_DeinitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+	dev = dev;
+}
+
+void yaffs_InitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+	dev = dev;
+}
+
+yaffs_Tnode *yaffs_AllocateRawTnode(yaffs_Device *dev)
+{
+	return (yaffs_Tnode *)YMALLOC(dev->tnodeSize);
+}
+
+void yaffs_FreeRawTnode(yaffs_Device *dev, yaffs_Tnode *tn)
+{
+	dev = dev;
+	YFREE(tn);
+}
+
+void yaffs_InitialiseRawObjects(yaffs_Device *dev)
+{
+	dev = dev;
+}
+
+void yaffs_DeinitialiseRawObjects(yaffs_Device *dev)
+{
+	dev = dev;
+}
+
+yaffs_Object *yaffs_AllocateRawObject(yaffs_Device *dev)
+{
+	dev = dev;
+	return (yaffs_Object *) YMALLOC(sizeof(yaffs_Object));
+}
+
+
+void yaffs_FreeRawObject(yaffs_Device *dev, yaffs_Object *obj)
+{
+
+	dev = dev;
+	YFREE(obj);
+}
+
+#else
+
+struct yaffs_TnodeList_struct {
+	struct yaffs_TnodeList_struct *next;
+	yaffs_Tnode *tnodes;
+};
+
+typedef struct yaffs_TnodeList_struct yaffs_TnodeList;
+
+struct yaffs_ObjectList_struct {
+	yaffs_Object *objects;
+	struct yaffs_ObjectList_struct *next;
+};
+
+typedef struct yaffs_ObjectList_struct yaffs_ObjectList;
+
+
+struct yaffs_AllocatorStruct {
+	int nTnodesCreated;
+	yaffs_Tnode *freeTnodes;
+	int nFreeTnodes;
+	yaffs_TnodeList *allocatedTnodeList;
+
+	int nObjectsCreated;
+	yaffs_Object *freeObjects;
+	int nFreeObjects;
+
+	yaffs_ObjectList *allocatedObjectList;
+};
+
+typedef struct yaffs_AllocatorStruct yaffs_Allocator;
+
+
+static void yaffs_DeinitialiseRawTnodes(yaffs_Device *dev)
+{
+
+	yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator;
+
+	yaffs_TnodeList *tmp;
+
+	if(!allocator){
+		YBUG();
+		return;
+	}
+
+	while (allocator->allocatedTnodeList) {
+		tmp = allocator->allocatedTnodeList->next;
+
+		YFREE(allocator->allocatedTnodeList->tnodes);
+		YFREE(allocator->allocatedTnodeList);
+		allocator->allocatedTnodeList = tmp;
+
+	}
+
+	allocator->freeTnodes = NULL;
+	allocator->nFreeTnodes = 0;
+	allocator->nTnodesCreated = 0;
+}
+
+static void yaffs_InitialiseRawTnodes(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+
+	if(allocator){
+		allocator->allocatedTnodeList = NULL;
+		allocator->freeTnodes = NULL;
+		allocator->nFreeTnodes = 0;
+		allocator->nTnodesCreated = 0;
+	} else
+		YBUG();
+}
+
+static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
+{
+	yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator;
+	int i;
+	yaffs_Tnode *newTnodes;
+	__u8 *mem;
+	yaffs_Tnode *curr;
+	yaffs_Tnode *next;
+	yaffs_TnodeList *tnl;
+
+	if(!allocator){
+		YBUG();
+		return YAFFS_FAIL;
+	}
+
+	if (nTnodes < 1)
+		return YAFFS_OK;
+
+
+	/* make these things */
+
+	newTnodes = YMALLOC(nTnodes * dev->tnodeSize);
+	mem = (__u8 *)newTnodes;
+
+	if (!newTnodes) {
+		T(YAFFS_TRACE_ERROR,
+			(TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	/* New hookup for wide tnodes */
+	for (i = 0; i < nTnodes - 1; i++) {
+		curr = (yaffs_Tnode *) &mem[i * dev->tnodeSize];
+		next = (yaffs_Tnode *) &mem[(i+1) * dev->tnodeSize];
+		curr->internal[0] = next;
+	}
+
+	curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * dev->tnodeSize];
+	curr->internal[0] = allocator->freeTnodes;
+	allocator->freeTnodes = (yaffs_Tnode *)mem;
+
+	allocator->nFreeTnodes += nTnodes;
+	allocator->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 = allocator->allocatedTnodeList;
+		allocator->allocatedTnodeList = tnl;
+	}
+
+	T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
+
+	return YAFFS_OK;
+}
+
+
+yaffs_Tnode *yaffs_AllocateRawTnode(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator;
+	yaffs_Tnode *tn = NULL;
+
+	if(!allocator){
+		YBUG();
+		return NULL;
+	}
+
+	/* If there are none left make more */
+	if (!allocator->freeTnodes)
+		yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
+
+	if (allocator->freeTnodes) {
+		tn = allocator->freeTnodes;
+		allocator->freeTnodes = allocator->freeTnodes->internal[0];
+		allocator->nFreeTnodes--;
+	}
+
+	return tn;
+}
+
+/* FreeTnode frees up a tnode and puts it back on the free list */
+void yaffs_FreeRawTnode(yaffs_Device *dev, yaffs_Tnode *tn)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+
+	if(!allocator){
+		YBUG();
+		return;
+	}
+
+	if (tn) {
+		tn->internal[0] = allocator->freeTnodes;
+		allocator->freeTnodes = tn;
+		allocator->nFreeTnodes++;
+	}
+	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
+}
+
+
+
+static void yaffs_InitialiseRawObjects(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+
+	if(allocator) {
+		allocator->allocatedObjectList = NULL;
+		allocator->freeObjects = NULL;
+		allocator->nFreeObjects = 0;
+	} else
+		YBUG();
+}
+
+static void yaffs_DeinitialiseRawObjects(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+	yaffs_ObjectList *tmp;
+
+	if(!allocator){
+		YBUG();
+		return;
+	}
+
+	while (allocator->allocatedObjectList) {
+		tmp = allocator->allocatedObjectList->next;
+		YFREE(allocator->allocatedObjectList->objects);
+		YFREE(allocator->allocatedObjectList);
+
+		allocator->allocatedObjectList = tmp;
+	}
+
+	allocator->freeObjects = NULL;
+	allocator->nFreeObjects = 0;
+	allocator->nObjectsCreated = 0;
+}
+
+
+static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+
+	int i;
+	yaffs_Object *newObjects;
+	yaffs_ObjectList *list;
+
+	if(!allocator){
+		YBUG();
+		return YAFFS_FAIL;
+	}
+
+	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);
+			newObjects = NULL;
+		}
+		if (list){
+			YFREE(list);
+			list = NULL;
+		}
+		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 ylist_head *)(&newObjects[i + 1]);
+	}
+
+	newObjects[nObjects - 1].siblings.next = (void *)allocator->freeObjects;
+	allocator->freeObjects = newObjects;
+	allocator->nFreeObjects += nObjects;
+	allocator->nObjectsCreated += nObjects;
+
+	/* Now add this bunch of Objects to a list for freeing up. */
+
+	list->objects = newObjects;
+	list->next = allocator->allocatedObjectList;
+	allocator->allocatedObjectList = list;
+
+	return YAFFS_OK;
+}
+
+yaffs_Object *yaffs_AllocateRawObject(yaffs_Device *dev)
+{
+	yaffs_Object *obj = NULL;
+	yaffs_Allocator *allocator = dev->allocator;
+
+	if(!allocator) {
+		YBUG();
+		return obj;
+	}
+
+	/* If there are none left make more */
+	if (!allocator->freeObjects)
+		yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
+
+	if (allocator->freeObjects) {
+		obj = allocator->freeObjects;
+		allocator->freeObjects =
+			(yaffs_Object *) (allocator->freeObjects->siblings.next);
+		allocator->nFreeObjects--;
+	}
+
+	return obj;
+}
+
+
+void yaffs_FreeRawObject(yaffs_Device *dev, yaffs_Object *obj)
+{
+
+	yaffs_Allocator *allocator = dev->allocator;
+
+	if(!allocator)
+		YBUG();
+	else {
+		/* Link into the free list. */
+		obj->siblings.next = (struct ylist_head *)(allocator->freeObjects);
+		allocator->freeObjects = obj;
+		allocator->nFreeObjects++;
+	}
+}
+
+void yaffs_DeinitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+	if(dev->allocator){
+		yaffs_DeinitialiseRawTnodes(dev);
+		yaffs_DeinitialiseRawObjects(dev);
+
+		YFREE(dev->allocator);
+		dev->allocator=NULL;
+	} else
+		YBUG();
+}
+
+void yaffs_InitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator;
+
+	if(!dev->allocator){
+		allocator = YMALLOC(sizeof(yaffs_Allocator));
+		if(allocator){
+			dev->allocator = allocator;
+			yaffs_InitialiseRawTnodes(dev);
+			yaffs_InitialiseRawObjects(dev);
+		}
+	} else
+		YBUG();
+}
+
+
+#endif
diff --git a/fs/yaffs2/yaffs_allocator.h b/fs/yaffs2/yaffs_allocator.h
new file mode 100644
index 000000000000..b0a5d11b411b
--- /dev/null
+++ b/fs/yaffs2/yaffs_allocator.h
@@ -0,0 +1,30 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_ALLOCATOR_H__
+#define __YAFFS_ALLOCATOR_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_InitialiseRawTnodesAndObjects(yaffs_Device *dev);
+void yaffs_DeinitialiseRawTnodesAndObjects(yaffs_Device *dev);
+
+yaffs_Tnode *yaffs_AllocateRawTnode(yaffs_Device *dev);
+void yaffs_FreeRawTnode(yaffs_Device *dev, yaffs_Tnode *tn);
+
+yaffs_Object *yaffs_AllocateRawObject(yaffs_Device *dev);
+void yaffs_FreeRawObject(yaffs_Device *dev, yaffs_Object *obj);
+
+#endif
diff --git a/fs/yaffs2/yaffs_bitmap.c b/fs/yaffs2/yaffs_bitmap.c
new file mode 100644
index 000000000000..c7e9e8c4d8e8
--- /dev/null
+++ b/fs/yaffs2/yaffs_bitmap.c
@@ -0,0 +1,105 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_bitmap.h"
+#include "yaffs_trace.h"
+/*
+ * Chunk bitmap manipulations
+ */
+
+static 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));
+}
+
+void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
+{
+	if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
+			chunk < 0 || chunk >= dev->param.nChunksPerBlock) {
+		T(YAFFS_TRACE_ERROR,
+		(TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
+			blk, chunk));
+		YBUG();
+	}
+}
+
+void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+
+	memset(blkBits, 0, dev->chunkBitmapStride);
+}
+
+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));
+}
+
+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));
+}
+
+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;
+}
+
+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;
+}
+
+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;
+}
+
diff --git a/fs/yaffs2/yaffs_bitmap.h b/fs/yaffs2/yaffs_bitmap.h
new file mode 100644
index 000000000000..00cca2c0a360
--- /dev/null
+++ b/fs/yaffs2/yaffs_bitmap.h
@@ -0,0 +1,33 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * Chunk bitmap manipulations
+ */
+
+#ifndef __YAFFS_BITMAP_H__
+#define __YAFFS_BITMAP_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk);
+void yaffs_ClearChunkBits(yaffs_Device *dev, int blk);
+void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk);
+void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk);
+int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk);
+int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk);
+int yaffs_CountChunkBits(yaffs_Device *dev, int blk);
+
+#endif
diff --git a/fs/yaffs2/yaffs_checkptrw.c b/fs/yaffs2/yaffs_checkptrw.c
index 1304c19c185a..1b68e9dc4e58 100644
--- a/fs/yaffs2/yaffs_checkptrw.c
+++ b/fs/yaffs2/yaffs_checkptrw.c
@@ -14,7 +14,7 @@
 #include "yaffs_checkptrw.h"
 #include "yaffs_getblockinfo.h"
 
-static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
+static int yaffs2_CheckpointSpaceOk(yaffs_Device *dev)
 {
 	int blocksAvailable = dev->nErasedBlocks - dev->param.nReservedBlocks;
 
@@ -26,7 +26,7 @@ static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
 }
 
 
-static int yaffs_CheckpointErase(yaffs_Device *dev)
+static int yaffs2_CheckpointErase(yaffs_Device *dev)
 {
 	int i;
 
@@ -59,7 +59,7 @@ static int yaffs_CheckpointErase(yaffs_Device *dev)
 }
 
 
-static void yaffs_CheckpointFindNextErasedBlock(yaffs_Device *dev)
+static void yaffs2_CheckpointFindNextErasedBlock(yaffs_Device *dev)
 {
 	int  i;
 	int blocksAvailable = dev->nErasedBlocks - dev->param.nReservedBlocks;
@@ -87,7 +87,7 @@ static void yaffs_CheckpointFindNextErasedBlock(yaffs_Device *dev)
 	dev->checkpointCurrentBlock = -1;
 }
 
-static void yaffs_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
+static void yaffs2_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
 {
 	int  i;
 	yaffs_ExtendedTags tags;
@@ -123,7 +123,7 @@ static void yaffs_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
 }
 
 
-int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
+int yaffs2_CheckpointOpen(yaffs_Device *dev, int forWriting)
 {
 
 
@@ -136,7 +136,7 @@ int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
 		!dev->param.markNANDBlockBad)
 		return 0;
 
-	if (forWriting && !yaffs_CheckpointSpaceOk(dev))
+	if (forWriting && !yaffs2_CheckpointSpaceOk(dev))
 		return 0;
 
 	if (!dev->checkpointBuffer)
@@ -157,7 +157,7 @@ int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
 	if (forWriting) {
 		memset(dev->checkpointBuffer, 0, dev->nDataBytesPerChunk);
 		dev->checkpointByteOffset = 0;
-		return yaffs_CheckpointErase(dev);
+		return yaffs2_CheckpointErase(dev);
 	} else {
 		int i;
 		/* Set to a value that will kick off a read */
@@ -177,7 +177,7 @@ int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
 	return 1;
 }
 
-int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
+int yaffs2_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
 {
 	__u32 compositeSum;
 	compositeSum =  (dev->checkpointSum << 8) | (dev->checkpointXor & 0xFF);
@@ -185,7 +185,7 @@ int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
 	return 1;
 }
 
-static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
+static int yaffs2_CheckpointFlushBuffer(yaffs_Device *dev)
 {
 	int chunk;
 	int realignedChunk;
@@ -193,7 +193,7 @@ static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
 	yaffs_ExtendedTags tags;
 
 	if (dev->checkpointCurrentBlock < 0) {
-		yaffs_CheckpointFindNextErasedBlock(dev);
+		yaffs2_CheckpointFindNextErasedBlock(dev);
 		dev->checkpointCurrentChunk = 0;
 	}
 
@@ -238,7 +238,7 @@ static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
 }
 
 
-int yaffs_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes)
+int yaffs2_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes)
 {
 	int i = 0;
 	int ok = 1;
@@ -267,13 +267,13 @@ int yaffs_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes)
 
 		if (dev->checkpointByteOffset < 0 ||
 		   dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
-			ok = yaffs_CheckpointFlushBuffer(dev);
+			ok = yaffs2_CheckpointFlushBuffer(dev);
 	}
 
 	return i;
 }
 
-int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
+int yaffs2_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
 {
 	int i = 0;
 	int ok = 1;
@@ -298,7 +298,7 @@ int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
 			dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
 
 			if (dev->checkpointCurrentBlock < 0) {
-				yaffs_CheckpointFindNextCheckpointBlock(dev);
+				yaffs2_CheckpointFindNextCheckpointBlock(dev);
 				dev->checkpointCurrentChunk = 0;
 			}
 
@@ -310,7 +310,7 @@ int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
 					dev->checkpointCurrentChunk;
 
 				realignedChunk = chunk - dev->chunkOffset;
-				
+
 				dev->nPageReads++;
 
 				/* read in the next chunk */
@@ -348,12 +348,12 @@ int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
 	return 	i;
 }
 
-int yaffs_CheckpointClose(yaffs_Device *dev)
+int yaffs2_CheckpointClose(yaffs_Device *dev)
 {
 
 	if (dev->checkpointOpenForWrite) {
 		if (dev->checkpointByteOffset != 0)
-			yaffs_CheckpointFlushBuffer(dev);
+			yaffs2_CheckpointFlushBuffer(dev);
 	} else if(dev->checkpointBlockList){
 		int i;
 		for (i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++) {
@@ -387,14 +387,14 @@ int yaffs_CheckpointClose(yaffs_Device *dev)
 		return 0;
 }
 
-int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)
+int yaffs2_CheckpointInvalidateStream(yaffs_Device *dev)
 {
 	/* Erase the checkpoint data */
 
 	T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint invalidate of %d blocks"TENDSTR),
 		dev->blocksInCheckpoint));
 
-	return yaffs_CheckpointErase(dev);
+	return yaffs2_CheckpointErase(dev);
 }
 
 
diff --git a/fs/yaffs2/yaffs_checkptrw.h b/fs/yaffs2/yaffs_checkptrw.h
index 881c3659c8a9..ea4f0276f2b0 100644
--- a/fs/yaffs2/yaffs_checkptrw.h
+++ b/fs/yaffs2/yaffs_checkptrw.h
@@ -18,17 +18,17 @@
 
 #include "yaffs_guts.h"
 
-int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting);
+int yaffs2_CheckpointOpen(yaffs_Device *dev, int forWriting);
 
-int yaffs_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes);
+int yaffs2_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes);
 
-int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes);
+int yaffs2_CheckpointRead(yaffs_Device *dev, void *data, int nBytes);
 
-int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum);
+int yaffs2_GetCheckpointSum(yaffs_Device *dev, __u32 *sum);
 
-int yaffs_CheckpointClose(yaffs_Device *dev);
+int yaffs2_CheckpointClose(yaffs_Device *dev);
 
-int yaffs_CheckpointInvalidateStream(yaffs_Device *dev);
+int yaffs2_CheckpointInvalidateStream(yaffs_Device *dev);
 
 
 #endif
diff --git a/fs/yaffs2/yaffs_guts.c b/fs/yaffs2/yaffs_guts.c
index 9509dd401a33..661f9167113d 100644
--- a/fs/yaffs2/yaffs_guts.c
+++ b/fs/yaffs2/yaffs_guts.c
@@ -10,6 +10,7 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
+
 #include "yportenv.h"
 #include "yaffs_trace.h"
 
@@ -19,34 +20,28 @@
 #include "yaffs_getblockinfo.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_yaffs1.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_verify.h"
 
 #include "yaffs_nand.h"
 #include "yaffs_packedtags2.h"
 
+#include "yaffs_nameval.h"
+#include "yaffs_allocator.h"
 
 /* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
 #define YAFFS_GC_GOOD_ENOUGH 2
 #define YAFFS_GC_PASSIVE_THRESHOLD 4
 
-#define YAFFS_SMALL_HOLE_THRESHOLD 3
-
-/*
- * Checkpoints are really no benefit on very small partitions.
- *
- * To save space on small partitions don't bother with checkpoints unless
- * the partition is at least this big.
- */
-#define YAFFS_CHECKPOINT_MIN_BLOCKS 60
-
 #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,
@@ -62,28 +57,22 @@ static void yaffs_UpdateParent(yaffs_Object *obj);
 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 int yaffs_ApplyXMod(yaffs_Object *obj, char *buffer, yaffs_XAttrMod *xmod);
+
 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
 static int yaffs_CheckStructures(void);
 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
 
-static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev, int blockNo);
-
-
 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
 				int chunkInNAND);
 
@@ -95,38 +84,24 @@ static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
 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);
 
-static void yaffs_VerifyDirectory(yaffs_Object *directory);
-#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);
-
-static int yaffs_HandleHole(yaffs_Object *obj, loff_t newSize);
-static void yaffs_SkipRestOfBlock(yaffs_Device *dev);
 static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
 					int chunkInNAND,
 					const __u8 *data,
 					yaffs_ExtendedTags *tags);
 
+
+static void yaffs_LoadNameFromObjectHeader(yaffs_Device *dev,YCHAR *name, const YCHAR *ohName, int bufferSize);
+static void yaffs_LoadObjectHeaderFromName(yaffs_Device *dev,YCHAR *ohName, const YCHAR *name);
+
+
 /* Function to calculate chunk and offset */
 
 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut,
@@ -313,556 +288,11 @@ int yaffs_IsManagedTempBuffer(yaffs_Device *dev, const __u8 *buffer)
 	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->param.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)
-{
-	dev=dev;
-	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
-}
-
-static int yaffs_SkipFullVerification(yaffs_Device *dev)
-{
-	dev=dev;
-	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
-}
-
-static int yaffs_SkipNANDVerification(yaffs_Device *dev)
-{
-	dev=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 >= 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->param.nChunksPerBlock ||
-	   bi->softDeletions < 0 || bi->softDeletions > dev->param.nChunksPerBlock ||
-	   actuallyUsed < 0 || actuallyUsed > dev->param.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->param.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 */
-	/* This will need to change if we do partial gc */
-
-	if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
-			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 < 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 (obj && yaffs_SkipVerification(obj->myDev))
-		return;
-
-	if (!(tags && obj && oh)) {
-		T(YAFFS_TRACE_VERIFY,
-				(TSTR("Verifying object header tags %p obj %p oh %p"TENDSTR),
-				tags, obj, 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));
-}
-
-
-#if 0
-/* Not being used, but don't want to throw away yet */
-static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
-					__u32 level, int chunkOffset)
-{
-	int i;
-	yaffs_Device *dev = obj->myDev;
-	int ok = 1;
-
-	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) {
-			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;
-
-}
-
-#endif
-
-static void yaffs_VerifyFile(yaffs_Object *obj)
-{
-	int requiredTallness;
-	int actualTallness;
-	__u32 lastChunk;
-	__u32 x;
-	__u32 i;
-	yaffs_Device *dev;
-	yaffs_ExtendedTags tags;
-	yaffs_Tnode *tn;
-	__u32 objectId;
-
-	if (!obj)
-		return;
-
-	if (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;
 
-	/* 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_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 chunkInRange;
-	__u32 chunkShouldNotBeDeleted;
-	__u32 chunkValid;
-
-	if (!obj)
-		return;
-
-	if (obj->beingCreated)
-		return;
-
-	dev = obj->myDev;
-
-	if (yaffs_SkipVerification(dev))
-		return;
-
-	/* Check sane object header chunk */
-
-	chunkMin = dev->internalStartBlock * dev->param.nChunksPerBlock;
-	chunkMax = (dev->internalEndBlock+1) * dev->param.nChunksPerBlock - 1;
-
-	chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
-	chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
-	chunkValid = chunkInRange &&
-			yaffs_CheckChunkBit(dev,
-					obj->hdrChunk / dev->param.nChunksPerBlock,
-					obj->hdrChunk % dev->param.nChunksPerBlock);
-	chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
-
-	if (!obj->fake &&
-			(!chunkIdOk || chunkShouldNotBeDeleted)) {
-		T(YAFFS_TRACE_VERIFY,
-			(TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
-			obj->objectId, obj->hdrChunk,
-			chunkIdOk ? "" : ",out of range",
-			chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
-	}
-
-	if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
-		yaffs_ExtendedTags tags;
-		yaffs_ObjectHeader *oh;
-		__u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
-
-		oh = (yaffs_ObjectHeader *)buffer;
-
-		yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, 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 ylist_head *lh;
-
-	if (yaffs_SkipVerification(dev))
-		return;
-
-	/* Iterate through the objects in each hash entry */
-
-	for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
-		ylist_for_each(lh, &dev->objectBucket[i].list) {
-			if (lh) {
-				obj = ylist_entry(lh, yaffs_Object, hashLink);
-				yaffs_VerifyObject(obj);
-			}
-		}
-	}
-}
 
 
 /*
@@ -941,7 +371,7 @@ static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
 	yaffs_ExtendedTags tempTags;
 	__u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
 	int result;
-	
+
 	result = yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,&tempTags);
 	if(memcmp(buffer,data,dev->nDataBytesPerChunk) ||
 		tempTags.objectId != tags->objectId ||
@@ -963,7 +393,7 @@ static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
 	int writeOk = 0;
 	int chunk;
 
-	yaffs_InvalidateCheckpoint(dev);
+	yaffs2_InvalidateCheckpoint(dev);
 
 	do {
 		yaffs_BlockInfo *bi = 0;
@@ -995,16 +425,16 @@ static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
 		 * lot of checks that are most likely not needed.
 		 *
 		 * Mods to the above
-		 * If an erase check fails or the write fails we skip the 
+		 * If an erase check fails or the write fails we skip the
 		 * rest of the block.
 		 */
 
 		/* let's give it a try */
 		attempts++;
 
-#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
-		bi->skipErasedCheck = 0;
-#endif
+		if(dev->param.alwaysCheckErased)
+			bi->skipErasedCheck = 0;
+
 		if (!bi->skipErasedCheck) {
 			erasedOk = yaffs_CheckChunkErased(dev, chunk);
 			if (erasedOk != YAFFS_OK) {
@@ -1057,85 +487,8 @@ static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
 }
 
 
-/*
- * Oldest Dirty Sequence Number handling.
- */
- 
-/* yaffs_CalcOldestDirtySequence()
- * yaffs_FindOldestDirtySequence()
- * Calculate the oldest dirty sequence number if we don't know it.
- */
-static void yaffs_CalcOldestDirtySequence(yaffs_Device *dev)
-{
-	int i;
-	unsigned seq;
-	unsigned blockNo = 0;
-	yaffs_BlockInfo *b;
-
-	if(!dev->param.isYaffs2)
-		return;
-
-	/* Find the oldest dirty sequence number. */
-	seq = dev->sequenceNumber + 1;
-	b = dev->blockInfo;
-	for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
-		if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
-			(b->pagesInUse - b->softDeletions) < dev->param.nChunksPerBlock &&
-			b->sequenceNumber < seq) {
-			seq = b->sequenceNumber;
-			blockNo = i;
-		}
-		b++;
-	}
-
-	if(blockNo){
-		dev->oldestDirtySequence = seq;
-		dev->oldestDirtyBlock = blockNo;
-	}
-
-}
-
-
-static void yaffs_FindOldestDirtySequence(yaffs_Device *dev)
-{
-	if(dev->param.isYaffs2 && !dev->oldestDirtySequence)
-		yaffs_CalcOldestDirtySequence(dev);
-}
 
 /*
- * yaffs_ClearOldestDirtySequence()
- * Called when a block is erased or marked bad. (ie. when its sequenceNumber
- * becomes invalid). If the value matches the oldest then we clear 
- * dev->oldestDirtySequence to force its recomputation.
- */
-static void yaffs_ClearOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi)
-{
-
-	if(!dev->param.isYaffs2)
-		return;
-
-	if(!bi || bi->sequenceNumber == dev->oldestDirtySequence){
-		dev->oldestDirtySequence = 0;
-		dev->oldestDirtyBlock = 0;
-	}
-}
-
-/*
- * yaffs_UpdateOldestDirtySequence()
- * Update the oldest dirty sequence number whenever we dirty a block.
- * Only do this if the oldestDirtySequence is actually being tracked.
- */
-static void yaffs_UpdateOldestDirtySequence(yaffs_Device *dev, unsigned blockNo, yaffs_BlockInfo *bi)
-{
-	if(dev->param.isYaffs2 && dev->oldestDirtySequence){
-		if(dev->oldestDirtySequence > bi->sequenceNumber){
-			dev->oldestDirtySequence = bi->sequenceNumber;
-			dev->oldestDirtyBlock = blockNo;
-		}
-	}
-}
- 
-/*
  * Block retiring for handling a broken block.
  */
 
@@ -1143,9 +496,9 @@ static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
 {
 	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
 
-	yaffs_InvalidateCheckpoint(dev);
-	
-	yaffs_ClearOldestDirtySequence(dev,bi);
+	yaffs2_InvalidateCheckpoint(dev);
+
+	yaffs2_ClearOldestDirtySequence(dev,bi);
 
 	if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
 		if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
@@ -1260,7 +613,7 @@ static __u16 yaffs_CalcNameSum(const YCHAR *name)
 	return sum;
 }
 
-static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
+void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
 {
 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
 	memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
@@ -1272,6 +625,18 @@ static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
 	obj->sum = yaffs_CalcNameSum(name);
 }
 
+void yaffs_SetObjectNameFromOH(yaffs_Object *obj, const yaffs_ObjectHeader *oh)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+	YCHAR tmpName[YAFFS_MAX_NAME_LENGTH+1];
+	memset(tmpName,0,sizeof(tmpName));
+	yaffs_LoadNameFromObjectHeader(obj->myDev,tmpName,oh->name,YAFFS_MAX_NAME_LENGTH+1);
+	yaffs_SetObjectName(obj,tmpName);
+#else
+	yaffs_SetObjectName(obj,oh->name);
+#endif
+}
+
 /*-------------------- TNODES -------------------
 
  * List of spare tnodes
@@ -1279,194 +644,33 @@ static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
  * 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 Y_INLINE int yaffs_CalcTnodeSize(yaffs_Device *dev)
-{
-	int tnodeSize;
-	/* 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;
-
-	if (tnodeSize < sizeof(yaffs_Tnode))
-		tnodeSize = sizeof(yaffs_Tnode);
-	return tnodeSize;
-}
 
-static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
+yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
 {
-	int i;
-	int tnodeSize = yaffs_CalcTnodeSize(dev);
-	yaffs_Tnode *newTnodes;
-	__u8 *mem;
-	yaffs_Tnode *curr;
-	yaffs_Tnode *next;
-	yaffs_TnodeList *tnl;
-
-	if (nTnodes < 1)
-		return YAFFS_OK;
-
-
-	/* 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;
+	yaffs_Tnode *tn = yaffs_AllocateRawTnode(dev);
+	if (tn){
+		memset(tn, 0, dev->tnodeSize);
+		dev->nTnodes++;
 	}
 
-	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;
-
-#ifdef CONFIG_YAFFS_VALGRIND_TEST
-	tn = YMALLOC(yaffs_CalcTnodeSize(dev));
-	if(tn)
-		dev->nTnodesCreated++;
-#else
-	/* 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--;
-	}
-#endif
 	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
 
 	return tn;
 }
 
-static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
-{
-	yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
-	int tnodeSize = yaffs_CalcTnodeSize(dev);
-
-	if (tn)
-		memset(tn, 0, tnodeSize);
-
-	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_VALGRIND_TEST
-		YFREE(tn);
-		dev->nTnodesCreated--;
-#else
-#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++;
-#endif
-	}
+	yaffs_FreeRawTnode(dev,tn);
+	dev->nTnodes--;
 	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
 }
 
-static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
+static void yaffs_DeinitialiseTnodesAndObjects(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;
-	dev->nTnodesCreated = 0;
-}
-
-static void yaffs_InitialiseTnodes(yaffs_Device *dev)
-{
-	dev->allocatedTnodeList = NULL;
-	dev->freeTnodes = NULL;
-	dev->nFreeTnodes = 0;
-	dev->nTnodesCreated = 0;
+	yaffs_DeinitialiseRawTnodesAndObjects(dev);
+	dev->nObjects = 0;
+	dev->nTnodes = 0;
 }
 
 
@@ -1500,7 +704,7 @@ void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
 	}
 }
 
-static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
+__u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
 		unsigned pos)
 {
 	__u32 *map = (__u32 *)tn;
@@ -1537,7 +741,7 @@ static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
  */
 
 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
-static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
+yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
 					yaffs_FileStructure *fStruct,
 					__u32 chunkId)
 {
@@ -1591,7 +795,7 @@ static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
  *  be plugged into the ttree.
  */
 
-static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
+yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
 					yaffs_FileStructure *fStruct,
 					__u32 chunkId,
 					yaffs_Tnode *passedTn)
@@ -1696,7 +900,7 @@ static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
 	for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
 		if (yaffs_CheckChunkBit(dev, theChunk / dev->param.nChunksPerBlock,
 				theChunk % dev->param.nChunksPerBlock)) {
-			
+
 			if(dev->chunkGroupSize == 1)
 				return theChunk;
 			else {
@@ -1822,7 +1026,7 @@ static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
 	if (theBlock) {
 		theBlock->softDeletions++;
 		dev->nFreeChunks++;
-		yaffs_UpdateOldestDirtySequence(dev, blockNo, theBlock);
+		yaffs2_UpdateOldestDirtySequence(dev, blockNo, theBlock);
 	}
 }
 
@@ -1950,7 +1154,7 @@ static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
 					hasData++;
 			}
 		} else {
-			int tnodeSize_u32 = yaffs_CalcTnodeSize(dev)/sizeof(__u32);
+			int tnodeSize_u32 = dev->tnodeSize/sizeof(__u32);
 			__u32 *map = (__u32 *)tn;
 
                         for(i = 0; !hasData && i < tnodeSize_u32; i++){
@@ -2015,96 +1219,32 @@ static int yaffs_PruneFileStructure(yaffs_Device *dev,
 
 /*-------------------- 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);
-			newObjects = NULL;
-		}
-		if (list){
-			YFREE(list);
-			list = NULL;
-		}
-		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 ylist_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;
+	yaffs_Object *obj = yaffs_AllocateRawObject(dev);
 
-#ifdef CONFIG_YAFFS_VALGRIND_TEST
-	tn = YMALLOC(sizeof(yaffs_Object));
-	if(tn)
-		dev->nObjectsCreated++;
-#else
-	/* If there are none left make more */
-	if (!dev->freeObjects)
-		yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
+	if (obj) {
+		dev->nObjects++;
 
-	if (dev->freeObjects) {
-		tn = dev->freeObjects;
-		dev->freeObjects =
-			(yaffs_Object *) (dev->freeObjects->siblings.next);
-		dev->nFreeObjects--;
-	}
-#endif
-	if (tn) {
 		/* Now sweeten it up... */
 
-		memset(tn, 0, sizeof(yaffs_Object));
-		tn->beingCreated = 1;
+		memset(obj, 0, sizeof(yaffs_Object));
+		obj->beingCreated = 1;
 
-		tn->myDev = dev;
-		tn->hdrChunk = 0;
-		tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
-		YINIT_LIST_HEAD(&(tn->hardLinks));
-		YINIT_LIST_HEAD(&(tn->hashLink));
-		YINIT_LIST_HEAD(&tn->siblings);
+		obj->myDev = dev;
+		obj->hdrChunk = 0;
+		obj->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
+		YINIT_LIST_HEAD(&(obj->hardLinks));
+		YINIT_LIST_HEAD(&(obj->hashLink));
+		YINIT_LIST_HEAD(&obj->siblings);
 
 
 		/* Now make the directory sane */
 		if (dev->rootDir) {
-			tn->parent = dev->rootDir;
-			ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
+			obj->parent = dev->rootDir;
+			ylist_add(&(obj->siblings), &dev->rootDir->variant.directoryVariant.children);
 		}
 
 		/* Add it to the lost and found directory.
@@ -2112,14 +1252,14 @@ static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
 		 * check if lostNFound exists first
 		 */
 		if (dev->lostNFoundDir)
-			yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
+			yaffs_AddObjectToDirectory(dev->lostNFoundDir, obj);
 
-		tn->beingCreated = 0;
+		obj->beingCreated = 0;
 	}
 
 	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
 
-	return tn;
+	return obj;
 }
 
 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
@@ -2143,54 +1283,46 @@ static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
 
 }
 
-static void yaffs_UnhashObject(yaffs_Object *tn)
+static void yaffs_UnhashObject(yaffs_Object *obj)
 {
 	int bucket;
-	yaffs_Device *dev = tn->myDev;
+	yaffs_Device *dev = obj->myDev;
 
 	/* If it is still linked into the bucket list, free from the list */
-	if (!ylist_empty(&tn->hashLink)) {
-		ylist_del_init(&tn->hashLink);
-		bucket = yaffs_HashFunction(tn->objectId);
+	if (!ylist_empty(&obj->hashLink)) {
+		ylist_del_init(&obj->hashLink);
+		bucket = yaffs_HashFunction(obj->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)
+static void yaffs_FreeObject(yaffs_Object *obj)
 {
-	yaffs_Device *dev = tn->myDev;
+	yaffs_Device *dev = obj->myDev;
 
-	T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
+	T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), obj, obj->myInode));
 
-	if (!tn)
+	if (!obj)
 		YBUG();
-	if (tn->parent)
+	if (obj->parent)
 		YBUG();
-	if (!ylist_empty(&tn->siblings))
+	if (!ylist_empty(&obj->siblings))
 		YBUG();
 
 
-	if (tn->myInode) {
+	if (obj->myInode) {
 		/* We're still hooked up to a cached inode.
 		 * Don't delete now, but mark for later deletion
 		 */
-		tn->deferedFree = 1;
+		obj->deferedFree = 1;
 		return;
 	}
 
-	yaffs_UnhashObject(tn);
+	yaffs_UnhashObject(obj);
 
-#ifdef CONFIG_YAFFS_VALGRIND_TEST
-	YFREE(tn);
-	dev->nObjectsCreated--;
-	tn = NULL;
-#else
-	/* Link into the free list. */
-	tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
-	dev->freeObjects = tn;
-	dev->nFreeObjects++;
-#endif
+	yaffs_FreeRawObject(dev,obj);
+	dev->nObjects--;
 	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
 }
 
@@ -2201,33 +1333,14 @@ void yaffs_HandleDeferedFree(yaffs_Object *obj)
 		yaffs_FreeObject(obj);
 }
 
-
-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;
-	dev->nObjectsCreated = 0;
-}
-
-static void yaffs_InitialiseObjects(yaffs_Device *dev)
+static void yaffs_InitialiseTnodesAndObjects(yaffs_Device *dev)
 {
 	int i;
 
-	dev->allocatedObjectList = NULL;
-	dev->freeObjects = NULL;
-	dev->nFreeObjects = 0;
+	dev->nObjects = 0;
+	dev->nTnodes = 0;
+
+	yaffs_InitialiseRawTnodesAndObjects(dev);
 
 	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
 		YINIT_LIST_HEAD(&dev->objectBucket[i].list);
@@ -2394,9 +1507,9 @@ yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
 	return theObject;
 }
 
-static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
-						      int number,
-						      yaffs_ObjectType type)
+yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
+						int number,
+						yaffs_ObjectType type)
 {
 	yaffs_Object *theObject = NULL;
 
@@ -2411,7 +1524,7 @@ static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
 }
 
 
-static YCHAR *yaffs_CloneString(const YCHAR *str)
+YCHAR *yaffs_CloneString(const YCHAR *str)
 {
 	YCHAR *newStr = NULL;
 	int len;
@@ -2519,7 +1632,7 @@ static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
 			break;
 		}
 
-		if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
+		if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0, NULL) < 0) {
 			/* Could not create the object header, fail the creation */
 			yaffs_DeleteObject(in);
 			in = NULL;
@@ -2627,7 +1740,7 @@ static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
 			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)
+		if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows, NULL) >= 0)
 			return YAFFS_OK;
 	}
 
@@ -2696,7 +1809,7 @@ int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
 		yaffs_UpdateParent(oldDir);
 		if(newDir != oldDir)
 			yaffs_UpdateParent(newDir);
-		
+
 		return result;
 	}
 	return YAFFS_FAIL;
@@ -2760,86 +1873,7 @@ static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
 	dev->chunkBits = NULL;
 }
 
-static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
-					yaffs_BlockInfo *bi)
-{
-
-	if (!dev->param.isYaffs2)
-		return 1;	/* disqualification only applies to yaffs2. */
-
-	if (!bi->hasShrinkHeader)
-		return 1;	/* can gc */
-
-	yaffs_FindOldestDirtySequence(dev);
-
-	/* 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);
-}
-
-/*
- * yaffs_FindRefreshBlock()
- * periodically finds the oldest full block by sequence number for refreshing.
- * Only for yaffs2.
- */
-static __u32 yaffs_FindRefreshBlock(yaffs_Device *dev)
-{
-	__u32 b ;
-
-	__u32 oldest = 0;
-	__u32 oldestSequence = 0;
-
-	yaffs_BlockInfo *bi;
-
-	/*
-	 * If refresh period < 10 then refreshing is disabled.
-	 */
-	if(dev->param.refreshPeriod < 10 ||
-		!dev->param.isYaffs2)
-	        return oldest;
-
-        /*
-         * Fix broken values.
-         */
-        if(dev->refreshSkip > dev->param.refreshPeriod)
-                dev->refreshSkip = dev->param.refreshPeriod;
-
-	if(dev->refreshSkip > 0)
-	        return oldest;
-
-	/*
-	 * Refresh skip is now zero.
-	 * We'll do a refresh this time around....
-	 * Update the refresh skip and find the oldest block.
-	 */
-	dev->refreshSkip = dev->param.refreshPeriod;
-	dev->refreshCount++;
-	bi = dev->blockInfo;
-	for (b = dev->internalStartBlock; b <=dev->internalEndBlock; b++){
-
-		if (bi->blockState == YAFFS_BLOCK_STATE_FULL){
-
-			if(oldest < 1 ||
-                                bi->sequenceNumber < oldestSequence){
-                                oldest = b;
-                                oldestSequence = bi->sequenceNumber;
-                        }
-		}
-		bi++;
-	}
-
-	if (oldest > 0) {
-		T(YAFFS_TRACE_GC,
-		  (TSTR("GC refresh count %d selected block %d with sequenceNumber %d" TENDSTR),
-		   dev->refreshCount, oldest, oldestSequence));
-	}
-
-	return oldest;
-}
-
-
-static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
+void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
 {
 	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
 
@@ -2853,7 +1887,7 @@ static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
 		(TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
 		blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
 
-	yaffs_ClearOldestDirtySequence(dev,bi);
+	yaffs2_ClearOldestDirtySequence(dev,bi);
 
 	bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
 
@@ -2868,7 +1902,7 @@ static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
 	}
 
 	if (!bi->needsRetiring) {
-		yaffs_InvalidateCheckpoint(dev);
+		yaffs2_InvalidateCheckpoint(dev);
 		erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
 		if (!erasedOk) {
 			dev->nErasureFailures++;
@@ -2963,61 +1997,17 @@ static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
 }
 
 
-
-static int yaffs_CheckpointRequired(yaffs_Device *dev)
-{
-	int nblocks = dev->internalEndBlock - dev->internalStartBlock + 1 ;
-	return dev->param.isYaffs2 &&
-		!dev->param.skipCheckpointWrite &&
-		(nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS);
-}
-static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
-{
-	if (!dev->nCheckpointBlocksRequired &&
-		yaffs_CheckpointRequired(dev)){
-		/* Not a valid value so recalculate */
-		int nBytes = 0;
-		int nBlocks;
-		int devBlocks = (dev->param.endBlock - dev->param.startBlock + 1);
-		int tnodeSize = yaffs_CalcTnodeSize(dev);
-
-		nBytes += sizeof(yaffs_CheckpointValidity);
-		nBytes += sizeof(yaffs_CheckpointDevice);
-		nBytes += devBlocks * sizeof(yaffs_BlockInfo);
-		nBytes += devBlocks * dev->chunkBitmapStride;
-		nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
-		nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
-		nBytes += sizeof(yaffs_CheckpointValidity);
-		nBytes += sizeof(__u32); /* checksum*/
-
-		/* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
-
-		nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->param.nChunksPerBlock)) + 3;
-
-		dev->nCheckpointBlocksRequired = nBlocks;
-	}
-
-	return dev->nCheckpointBlocksRequired;
-}
-
 /*
  * 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 nChunks)
+int yaffs_CheckSpaceForAllocation(yaffs_Device *dev, int nChunks)
 {
 	int reservedChunks;
 	int reservedBlocks = dev->param.nReservedBlocks;
 	int checkpointBlocks;
 
-	if (dev->param.isYaffs2) {
-		checkpointBlocks =  yaffs_CalcCheckpointBlocksRequired(dev) -
-				    dev->blocksInCheckpoint;
-		if (checkpointBlocks < 0)
-			checkpointBlocks = 0;
-	} else {
-		checkpointBlocks = 0;
-	}
+	checkpointBlocks = yaffs2_CalcCheckpointBlocksRequired(dev);
 
 	reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.nChunksPerBlock);
 
@@ -3095,7 +2085,7 @@ static int yaffs_GetErasedChunks(yaffs_Device *dev)
  * yaffs_SkipRestOfBlock() skips over the rest of the allocation block
  * if we don't want to write to it.
  */
-static void yaffs_SkipRestOfBlock(yaffs_Device *dev)
+void yaffs_SkipRestOfBlock(yaffs_Device *dev)
 {
 	if(dev->allocationBlock > 0){
 		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
@@ -3114,7 +2104,6 @@ static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
 	int newChunk;
 	int markNAND;
 	int retVal = YAFFS_OK;
-	int cleanups = 0;
 	int i;
 	int isCheckpointBlock;
 	int matchingChunk;
@@ -3143,7 +2132,7 @@ static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
 
 	if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
 		bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
-	
+
 	bi->hasShrinkHeader = 0;	/* clear the flag so that the block can erase */
 
 	dev->gcDisable = 1;
@@ -3225,21 +2214,22 @@ static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
 					 * No need to copy this, just forget about it and
 					 * fix up the object.
 					 */
-					 
+
 					/* Free chunks already includes softdeleted chunks.
 					 * How ever this chunk is going to soon be really deleted
 					 * which will increment free chunks.
 					 * We have to decrement free chunks so this works out properly.
 					 */
 					dev->nFreeChunks--;
+					bi->softDeletions--;
 
 					object->nDataChunks--;
 
 					if (object->nDataChunks <= 0) {
 						/* remeber to clean up the object */
-						dev->gcCleanupList[cleanups] =
+						dev->gcCleanupList[dev->nCleanups] =
 						    tags.objectId;
-						cleanups++;
+						dev->nCleanups++;
 					}
 					markNAND = 0;
 				} else if (0) {
@@ -3325,8 +2315,23 @@ static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
 		yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
 
 
+
+	}
+
+	yaffs_VerifyCollectedBlock(dev, bi, block);
+
+
+
+	if (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
+		/*
+		 * The gc did not complete. Set block state back to FULL
+		 * because checkpointing does not restore gc.
+		 */
+		bi->blockState = YAFFS_BLOCK_STATE_FULL;
+	} else {
+		/* The gc completed. */
 		/* Do any required cleanups */
-		for (i = 0; i < cleanups; i++) {
+		for (i = 0; i < dev->nCleanups; i++) {
 			/* Time to delete the file too */
 			object =
 			    yaffs_FindObjectByNumber(dev,
@@ -3346,20 +2351,7 @@ static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
 
 		}
 
-	}
-
-	yaffs_VerifyCollectedBlock(dev, bi, block);
-
 
-
-	if (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
-		/*
-		 * The gc did not complete. Set block state back to FULL
-		 * because checkpointing does not restore gc.
-		 */
-		bi->blockState = YAFFS_BLOCK_STATE_FULL;
-	} else {
-		/* The gc completed. */
 		chunksAfter = yaffs_GetErasedChunks(dev);
 		if (chunksBefore >= chunksAfter) {
 			T(YAFFS_TRACE_GC,
@@ -3369,6 +2361,7 @@ static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
 		}
 		dev->gcBlock = 0;
 		dev->gcChunk = 0;
+		dev->nCleanups = 0;
 	}
 
 	dev->gcDisable = 0;
@@ -3404,7 +2397,7 @@ static unsigned yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
 			if (bi->gcPrioritise) {
 				prioritisedExists = 1;
 				if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
-				   yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
+				   yaffs2_BlockNotDisqualifiedFromGC(dev, bi)) {
 					selected = i;
 					prioritised = 1;
 				}
@@ -3440,7 +2433,16 @@ static unsigned yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
 			threshold = dev->param.nChunksPerBlock;
 			iterations = nBlocks;
 		} else {
-			int maxThreshold = dev->param.nChunksPerBlock/2;
+			int maxThreshold;
+
+			if(background)
+				maxThreshold = dev->param.nChunksPerBlock/2;
+			else
+				maxThreshold = dev->param.nChunksPerBlock/8;
+
+			if(maxThreshold <  YAFFS_GC_PASSIVE_THRESHOLD)
+				maxThreshold = YAFFS_GC_PASSIVE_THRESHOLD;
+
 			threshold = background ?
 				(dev->gcNotDone + 2) * 2 : 0;
 			if(threshold <YAFFS_GC_PASSIVE_THRESHOLD)
@@ -3470,7 +2472,7 @@ static unsigned yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
 			if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
 				pagesUsed < dev->param.nChunksPerBlock &&
 				(dev->gcDirtiest < 1 || pagesUsed < dev->gcPagesInUse) &&
-				yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
+				yaffs2_BlockNotDisqualifiedFromGC(dev, bi)) {
 				dev->gcDirtiest = dev->gcBlockFinder;
 				dev->gcPagesInUse = pagesUsed;
 			}
@@ -3487,7 +2489,7 @@ static unsigned yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
 
 	if(!selected && dev->param.isYaffs2 &&
 		dev->gcNotDone >= ( background ? 10 : 20)){
-		yaffs_FindOldestDirtySequence(dev);
+		yaffs2_FindOldestDirtySequence(dev);
 		if(dev->oldestDirtyBlock > 0) {
 			selected = dev->oldestDirtyBlock;
 			dev->gcDirtiest = selected;
@@ -3505,8 +2507,10 @@ static unsigned yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
 		  dev->param.nChunksPerBlock - dev->gcPagesInUse,
 		  prioritised));
 
+		dev->nGCBlocks++;
 		if(background)
 			dev->backgroundGCs++;
+
 		dev->gcDirtiest = 0;
 		dev->gcPagesInUse = 0;
 		dev->gcNotDone = 0;
@@ -3540,10 +2544,8 @@ static int yaffs_CheckGarbageCollection(yaffs_Device *dev, int background)
 	int aggressive = 0;
 	int gcOk = YAFFS_OK;
 	int maxTries = 0;
-
 	int minErased;
 	int erasedChunks;
-
 	int checkpointBlockAdjust;
 
 	if(dev->param.gcControl &&
@@ -3562,9 +2564,7 @@ static int yaffs_CheckGarbageCollection(yaffs_Device *dev, int background)
 	do {
 		maxTries++;
 
-		checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
-		if (checkpointBlockAdjust < 0)
-			checkpointBlockAdjust = 0;
+		checkpointBlockAdjust = yaffs2_CalcCheckpointBlocksRequired(dev);
 
 		minErased  = dev->param.nReservedBlocks + checkpointBlockAdjust + 1;
 		erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
@@ -3573,6 +2573,9 @@ static int yaffs_CheckGarbageCollection(yaffs_Device *dev, int background)
 		if (dev->nErasedBlocks < minErased)
 			aggressive = 1;
 		else {
+			if(!background && erasedChunks > (dev->nFreeChunks / 4))
+				break;
+
 			if(dev->gcSkip > 20)
 				dev->gcSkip = 20;
 			if(erasedChunks < dev->nFreeChunks/2 ||
@@ -3590,12 +2593,14 @@ static int yaffs_CheckGarbageCollection(yaffs_Device *dev, int background)
                 /* If we don't already have a block being gc'd then see if we should start another */
 
 		if (dev->gcBlock < 1 && !aggressive) {
-			dev->gcBlock = yaffs_FindRefreshBlock(dev);
+			dev->gcBlock = yaffs2_FindRefreshBlock(dev);
 			dev->gcChunk = 0;
+			dev->nCleanups=0;
 		}
 		if (dev->gcBlock < 1) {
 			dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive, background);
 			dev->gcChunk = 0;
+			dev->nCleanups=0;
 		}
 
 		if (dev->gcBlock > 0) {
@@ -3714,66 +2719,9 @@ static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int 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)
-		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->param.nChunksPerBlock,
-			     theChunk % dev->param.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)
+int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
+			        int chunkInNAND, int inScan)
 {
 	/* NB inScan is zero unless scanning.
 	 * For forward scanning, inScan is > 0;
@@ -3811,7 +2759,7 @@ static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
 					NULL);
 	if (!tn)
 		return YAFFS_FAIL;
-	
+
 	if(!chunkInNAND)
 		/* Dummy insert, bail now */
 		return YAFFS_OK;
@@ -3829,7 +2777,7 @@ static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
 		 */
 
 		if (existingChunk > 0) {
-			/* NB Right now existing chunk will not be real chunkId if the device >= 32MB
+			/* NB Right now existing chunk will not be real chunkId if the chunk group size > 1
 			 *    thus we have to do a FindChunkInFile to get the real chunk id.
 			 *
 			 * We have a duplicate now we need to decide which one to use:
@@ -3871,8 +2819,7 @@ static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
 			}
 
 			if ((inScan > 0) &&
-			    (in->myDev->param.isYaffs2 ||
-			     existingChunk <= 0 ||
+			    (existingChunk <= 0 ||
 			     ((existingSerial + 1) & 3) == newSerial)) {
 				/* Forward scanning.
 				 * Use new
@@ -3941,14 +2888,14 @@ void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
 			 chunkId));
 
 	bi = yaffs_GetBlockInfo(dev, block);
-	
-	yaffs_UpdateOldestDirtySequence(dev, block, bi);
+
+	yaffs2_UpdateOldestDirtySequence(dev, block, bi);
 
 	T(YAFFS_TRACE_DELETION,
 	  (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
 
-	if (markNAND &&
-	    bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->param.isYaffs2) {
+	if (!dev->param.isYaffs2 && markNAND &&
+	    bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
 
 		yaffs_InitialiseTags(&tags);
 
@@ -4026,8 +2973,8 @@ static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
 		(TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
 		YBUG();
 	}
-	
-		
+
+
 	newChunkId =
 	    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
 					      useReserve);
@@ -4038,7 +2985,7 @@ static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
 		if (prevChunkId > 0)
 			yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
 
-		yaffs_CheckFileSanity(in);
+		yaffs_VerifyFileSanity(in);
 	}
 	return newChunkId;
 
@@ -4048,7 +2995,7 @@ static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
  * 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)
+			     int isShrink, int shadows, yaffs_XAttrMod *xmod)
 {
 
 	yaffs_BlockInfo *bi;
@@ -4062,7 +3009,7 @@ int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
 	int newChunkId;
 	yaffs_ExtendedTags newTags;
 	yaffs_ExtendedTags oldTags;
-	YCHAR *alias = NULL;
+	const YCHAR *alias = NULL;
 
 	__u8 *buffer = NULL;
 	YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
@@ -4074,7 +3021,7 @@ int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
 
 	if (!in->fake ||
 		in == dev->rootDir || /* The rootDir should also be saved */
-		force) {
+		force  || xmod) {
 
 		yaffs_CheckGarbageCollection(dev,0);
 		yaffs_CheckObjectDetailsLoaded(in);
@@ -4091,9 +3038,9 @@ int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
 			yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
 
 			memcpy(oldName, oh->name, sizeof(oh->name));
-		}
-
-		memset(buffer, 0xFF, dev->nDataBytesPerChunk);
+			memset(buffer, 0xFF, sizeof(yaffs_ObjectHeader));
+		} else
+			memset(buffer, 0xFF, dev->nDataBytesPerChunk);
 
 		oh->type = in->variantType;
 		oh->yst_mode = in->yst_mode;
@@ -4121,7 +3068,7 @@ int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
 
 		if (name && *name) {
 			memset(oh->name, 0, sizeof(oh->name));
-			yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
+			yaffs_LoadObjectHeaderFromName(dev,oh->name,name);
 		} else if (prevChunkId > 0)
 			memcpy(oh->name, oldName, sizeof(oh->name));
 		else
@@ -4161,6 +3108,11 @@ int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
 			break;
 		}
 
+		/* process any xattrib modifications */
+		if(xmod)
+			yaffs_ApplyXMod(in, (char *)buffer, xmod);
+
+
 		/* Tags */
 		yaffs_InitialiseTags(&newTags);
 		in->serial++;
@@ -4472,562 +3424,6 @@ static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
 	}
 }
 
-/*--------------------- 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;
-
-}
-
-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;
-}
-
-
-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->hdrChunk = obj->hdrChunk;
-	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 int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
-{
-
-	yaffs_Object *parent;
-
-	if (obj->variantType != cp->variantType) {
-		T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
-			TCONT("chunk %d does not match existing object type %d")
-			TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
-			obj->variantType));
-		return 0;
-	}
-
-	obj->objectId = cp->objectId;
-
-	if (cp->parentId)
-		parent = yaffs_FindOrCreateObjectByNumber(
-					obj->myDev,
-					cp->parentId,
-					YAFFS_OBJECT_TYPE_DIRECTORY);
-	else
-		parent = NULL;
-
-	if (parent) {
-		if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-			T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
-				TCONT(" chunk %d Parent type, %d, not directory")
-				TENDSTR),
-				cp->objectId, cp->parentId, cp->variantType,
-				cp->hdrChunk, parent->variantType));
-			return 0;
-		}
-		yaffs_AddObjectToDirectory(parent, obj);
-	}
-
-	obj->hdrChunk = cp->hdrChunk;
-	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->hdrChunk > 0)
-		obj->lazyLoaded = 1;
-	return 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 tnodeSize = yaffs_CalcTnodeSize(dev);
-
-	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;
-			ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
-			if (ok)
-				ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
-		}
-	}
-
-	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;
-	int tnodeSize = yaffs_CalcTnodeSize(dev);
-
-	ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
-
-	while (ok && (~baseChunk)) {
-		nread++;
-		/* Read level 0 tnode */
-
-
-		tn = yaffs_GetTnodeRaw(dev);
-		if (tn)
-			ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
-		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 ylist_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++) {
-		ylist_for_each(lh, &dev->objectBucket[i].list) {
-			if (lh) {
-				obj = ylist_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 %p" TENDSTR),
-						cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, 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, (int)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.hdrChunk));
-
-		if (ok && cp.objectId == ~0)
-			done = 1;
-		else if (ok) {
-			obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
-			if (obj) {
-				ok = yaffs_CheckpointObjectToObject(obj, &cp);
-				if (!ok)
-					break;
-				if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
-					ok = yaffs_ReadCheckpointTnodes(obj);
-				} else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
-					obj->hardLinks.next =
-						(struct ylist_head *) hardList;
-					hardList = obj;
-				}
-			} else
-				ok = 0;
-		}
-	}
-
-	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 (!yaffs_CheckpointRequired(dev)) {
-		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->param.skipCheckpointRead || !dev->param.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->param.markSuperBlockDirty)
-		dev->param.markSuperBlockDirty(dev);
-}
-
-
-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.
@@ -5310,7 +3706,7 @@ int yaffs_DoWriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
 			int nBytes, int writeThrough)
 {
-	yaffs_HandleHole(in,offset);
+	yaffs2_HandleHole(in,offset);
 	return yaffs_DoWriteDataToFile(in,buffer,offset,nBytes,writeThrough);
 }
 
@@ -5360,7 +3756,7 @@ static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
 }
 
 
-static void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize)
+void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize)
 {
 	int newFullChunks;
 	__u32 newSizeOfPartialChunk;
@@ -5391,91 +3787,6 @@ static void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize)
 }
 
 
-static int yaffs_HandleHole(yaffs_Object *obj, loff_t newSize)
-{
-	/* if newsSize > oldFileSize.
-	 * We're going to be writing a hole.
-	 * If the hole is small then write zeros otherwise write a start of hole marker.
-	 */
-		
-
-	loff_t oldFileSize;
-	int increase;
-	int smallHole   ;
-	int result = YAFFS_OK;
-	yaffs_Device *dev = NULL;
-
-	__u8 *localBuffer = NULL;
-	
-	int smallIncreaseOk = 0;
-	
-	if(!obj)
-		return YAFFS_FAIL;
-
-	if(obj->variantType != YAFFS_OBJECT_TYPE_FILE)
-		return YAFFS_FAIL;
-	
-	dev = obj->myDev;
-	
-	/* Bail out if not yaffs2 mode */
-	if(!dev->param.isYaffs2)
-		return YAFFS_OK;
-
-	oldFileSize = obj->variant.fileVariant.fileSize;
-
-	if (newSize <= oldFileSize)
-		return YAFFS_OK;
-
-	increase = newSize - oldFileSize;
-
-	if(increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->nDataBytesPerChunk &&
-		yaffs_CheckSpaceForAllocation(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
-		smallHole = 1;
-	else
-		smallHole = 0;
-
-	if(smallHole)
-		localBuffer= yaffs_GetTempBuffer(dev, __LINE__);
-	
-	if(localBuffer){
-		/* fill hole with zero bytes */
-		int pos = oldFileSize;
-		int thisWrite;
-		int written;
-		memset(localBuffer,0,dev->nDataBytesPerChunk);
-		smallIncreaseOk = 1;
-
-		while(increase > 0 && smallIncreaseOk){
-			thisWrite = increase;
-			if(thisWrite > dev->nDataBytesPerChunk)
-				thisWrite = dev->nDataBytesPerChunk;
-			written = yaffs_DoWriteDataToFile(obj,localBuffer,pos,thisWrite,0);
-			if(written == thisWrite){
-				pos += thisWrite;
-				increase -= thisWrite;
-			} else
-				smallIncreaseOk = 0;
-		}
-
-		yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
-
-		/* If we were out of space then reverse any chunks we've added */		
-		if(!smallIncreaseOk)
-			yaffs_ResizeDown(obj, oldFileSize);
-	}
-	
-	if (!smallIncreaseOk &&
-		obj->parent &&
-		obj->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
-		obj->parent->objectId != YAFFS_OBJECTID_DELETED){
-		/* Write a hole start header with the old file size */
-		yaffs_UpdateObjectHeader(obj, NULL, 0,1,0);
-	}
-
-	return result;
-
-}
-
 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
 {
 	yaffs_Device *dev = in->myDev;
@@ -5491,14 +3802,14 @@ int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
 
 	if (newSize == oldFileSize)
 		return YAFFS_OK;
-		
+
 	if(newSize > oldFileSize){
-		yaffs_HandleHole(in,newSize);
+		yaffs2_HandleHole(in,newSize);
 		in->variant.fileVariant.fileSize = newSize;
 	} else {
-		/* newSize < oldFileSize */ 
+		/* newSize < oldFileSize */
 		yaffs_ResizeDown(in, newSize);
-	} 
+	}
 
 	/* Write a new object header to reflect the resize.
 	 * show we've shrunk the file, if need be
@@ -5509,7 +3820,7 @@ int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
 	    !in->isShadowed &&
 	    in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
 	    in->parent->objectId != YAFFS_OBJECTID_DELETED)
-		yaffs_UpdateObjectHeader(in, NULL, 0,0,0);
+		yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0, NULL);
 
 
 	return YAFFS_OK;
@@ -5553,7 +3864,7 @@ int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
 #endif
 			}
 
-			retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
+			retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0, NULL) >=
 				0) ? YAFFS_OK : YAFFS_FAIL;
 		}
 	} else {
@@ -5816,7 +4127,7 @@ int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
 
 /*----------------------- Initialisation Scanning ---------------------- */
 
-static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
+void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
 				int backwardScanning)
 {
 	yaffs_Object *obj;
@@ -5850,13 +4161,8 @@ static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
 
 }
 
-typedef struct {
-	int seq;
-	int block;
-} yaffs_BlockIndex;
 
-
-static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
+void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
 {
 	yaffs_Object *hl;
 	yaffs_Object *in;
@@ -5885,29 +4191,6 @@ static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
 }
 
 
-
-
-
-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;
-}
-
-
-struct yaffs_ShadowFixerStruct {
-	int objectId;
-	int shadowedId;
-	struct yaffs_ShadowFixerStruct *next;
-};
-
-
 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
 {
 	/*
@@ -5917,6 +4200,9 @@ static void yaffs_StripDeletedObjects(yaffs_Device *dev)
 	struct ylist_head *n;
 	yaffs_Object *l;
 
+	if (dev->readOnly)
+		return;
+
 	/* Soft delete all the unlinked files */
 	ylist_for_each_safe(i, n,
 		&dev->unlinkedDir->variant.directoryVariant.children) {
@@ -5952,7 +4238,7 @@ static void yaffs_StripDeletedObjects(yaffs_Device *dev)
  * This fixes the problem where directories might have inadvertently been deleted
  * leaving the object "hanging" without being rooted in the directory tree.
  */
- 
+
 static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj)
 {
 	return (obj == dev->deletedDir ||
@@ -5970,6 +4256,8 @@ static void yaffs_FixHangingObjects(yaffs_Device *dev)
 	int depthLimit;
 	int hanging;
 
+	if (dev->readOnly)
+		return;
 
 	/* Iterate through the objects in each hash entry,
 	 * looking at each object.
@@ -5981,7 +4269,7 @@ static void yaffs_FixHangingObjects(yaffs_Device *dev)
 			if (lh) {
 				obj = ylist_entry(lh, yaffs_Object, hashLink);
 				parent= obj->parent;
-				
+
 				if(yaffs_HasNULLParent(dev,obj)){
 					/* These directories are not hanging */
 					hanging = 0;
@@ -6030,7 +4318,7 @@ static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
 
 	if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
 		YBUG();
-	
+
 	ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) {
 		if (lh) {
 			obj = ylist_entry(lh, yaffs_Object, siblings);
@@ -6044,10 +4332,10 @@ static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
 			/* Need to use UnlinkObject since Delete would not handle
 			 * hardlinked objects correctly.
 			 */
-			yaffs_UnlinkObject(obj); 
+			yaffs_UnlinkObject(obj);
 		}
 	}
-			
+
 }
 
 static void yaffs_EmptyLostAndFound(yaffs_Device *dev)
@@ -6055,446 +4343,6 @@ static void yaffs_EmptyLostAndFound(yaffs_Device *dev)
 	yaffs_DeleteDirectoryContents(dev->lostNFoundDir);
 }
 
-static int yaffs_Scan(yaffs_Device *dev)
-{
-	yaffs_ExtendedTags tags;
-	int blk;
-	int blockIterator;
-	int startIterator;
-	int endIterator;
-	int result;
-
-	int chunk;
-	int c;
-	int deleted;
-	yaffs_BlockState state;
-	yaffs_Object *hardList = NULL;
-	yaffs_BlockInfo *bi;
-	__u32 sequenceNumber;
-	yaffs_ObjectHeader *oh;
-	yaffs_Object *in;
-	yaffs_Object *parent;
-
-	int alloc_failed = 0;
-
-	struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
-
-
-	__u8 *chunkData;
-
-
-
-	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;
-
-	/* Scan all the blocks to determine their state */
-	bi = dev->blockInfo;
-	for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; 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_BAD_BLOCK)
-			bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
-
-		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->param.nChunksPerBlock;
-		}
-		bi++;
-	}
-
-	startIterator = dev->internalStartBlock;
-	endIterator = dev->internalEndBlock;
-
-	/* For each block.... */
-	for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
-	     blockIterator++) {
-
-		YYIELD();
-
-		YYIELD();
-
-		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->param.nChunksPerBlock &&
-		     state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
-			/* Read the tags and decide what to do */
-			chunk = blk * dev->param.nChunksPerBlock + c;
-
-			result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
-							&tags);
-
-			/* Let's have a good look at this chunk... */
-
-			if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || 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 block finder here to encourage the allocator to go forth from here. */
-
-				}
-
-				dev->nFreeChunks += (dev->param.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->param.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_DeleteObject(in);
-
-					in = 0;
-				}
-
-				in = yaffs_FindOrCreateObjectByNumber(dev,
-								      tags.
-								      objectId,
-								      oh->type);
-
-				if (!in)
-					alloc_failed = 1;
-
-				if (in && oh->shadowsObject > 0) {
-
-					struct yaffs_ShadowFixerStruct *fixer;
-					fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
-					if (fixer) {
-						fixer->next = shadowFixerList;
-						shadowFixerList = fixer;
-						fixer->objectId = tags.objectId;
-						fixer->shadowedId = oh->shadowsObject;
-					}
-
-				}
-
-				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 (((existingSerial + 1) & 3) == newSerial) {
-						/* Use new one - destroy the exisiting one */
-						yaffs_DeleteChunk(dev,
-								  in->hdrChunk,
-								  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->hdrChunk = chunk;
-					in->serial = tags.serialNumber;
-
-				} 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->hdrChunk = chunk;
-					in->serial = tags.serialNumber;
-
-					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)
-						alloc_failed = 1;
-					if (parent && parent->variantType ==
-					    YAFFS_OBJECT_TYPE_UNKNOWN) {
-						/* Set up as a directory */
-						parent->variantType =
-							YAFFS_OBJECT_TYPE_DIRECTORY;
-						YINIT_LIST_HEAD(&parent->variant.
-								directoryVariant.
-								children);
-					} else if (!parent || 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->param.useHeaderFileSize)
-
-							in->variant.fileVariant.
-							    fileSize =
-							    oh->fileSize;
-
-						break;
-					case YAFFS_OBJECT_TYPE_HARDLINK:
-						in->variant.hardLinkVariant.
-							equivalentObjectId =
-							oh->equivalentObjectId;
-						in->hardLinks.next =
-							(struct ylist_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 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-			/* If we got this far while scanning, then the block is fully allocated.*/
-			state = YAFFS_BLOCK_STATE_FULL;
-		}
-
-		if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
-			/* If the block was partially allocated then treat it as fully allocated.*/
-			state = YAFFS_BLOCK_STATE_FULL;
-			dev->allocationBlock = -1;
-		}
-
-		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);
-		}
-
-	}
-
-
-	/* 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);
-
-	/* Fix up any shadowed objects */
-	{
-		struct yaffs_ShadowFixerStruct *fixer;
-		yaffs_Object *obj;
-
-		while (shadowFixerList) {
-			fixer = shadowFixerList;
-			shadowFixerList = fixer->next;
-			/* Complete the rename transaction by deleting the shadowed object
-			 * then setting the object header to unshadowed.
-			 */
-			obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
-			if (obj)
-				yaffs_DeleteObject(obj);
-
-			obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
-
-			if (obj)
-				yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
-
-			YFREE(fixer);
-		}
-	}
-
-	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;
@@ -6539,7 +4387,7 @@ static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
 		in->yst_rdev = oh->yst_rdev;
 
 #endif
-		yaffs_SetObjectName(in, oh->name);
+		yaffs_SetObjectNameFromOH(in, oh);
 
 		if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
 			in->variant.symLinkVariant.alias =
@@ -6552,732 +4400,8 @@ static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
 	}
 }
 
-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;
-	__u32 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->param.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 */
-	bi = dev->blockInfo;
-	for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; 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;
-		if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
-			bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
-
-		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->param.nChunksPerBlock;
-		} else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-
-			/* Determine the highest sequence number */
-			if (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 {
-				/* TODO: Nasty sequence number! */
-				T(YAFFS_TRACE_SCAN,
-				  (TSTR
-				   ("Block scanning block %d has bad sequence number %d"
-				    TENDSTR), blk, sequenceNumber));
-
-			}
-		}
-		bi++;
-	}
-
-	T(YAFFS_TRACE_SCAN,
-	(TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
-
-
-
-	YYIELD();
-
-	/* Sort the blocks */
-#ifndef CONFIG_YAFFS_USE_OWN_SORT
-	{
-		/* Use qsort now. */
-		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->param.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->param.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.
-							 */
-
-							 T(YAFFS_TRACE_SCAN,
-							 (TSTR("Partially written block %d detected" TENDSTR),
-							 blk));
-						}
-					}
-				}
-
-				dev->nFreeChunks++;
-
-			} else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
-				T(YAFFS_TRACE_SCAN,
-				  (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
-				  blk, c));
-
-				  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 = chunkBase + 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 = endpos;
-					}
-
-				} else if (in) {
-					/* This chunk has been invalidated by a resize, or a past file deletion
-					 * so delete the chunk*/
-					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)
-						alloc_failed = 1;
-				}
-
-				if (!in ||
-				    (!in->valid && dev->param.disableLazyLoad) ||
-				    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 (dev->param.inbandTags) {
-						/* Fix up the header if they got corrupted by inband tags */
-						oh->shadowsObject = oh->inbandShadowsObject;
-						oh->isShrink = oh->inbandIsShrink;
-					}
-
-					if (!in) {
-						in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
-						if (!in)
-							alloc_failed = 1;
-					}
-
-				}
-
-				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));
-					continue;
-				}
-
-				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;
-
-
-						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 && in->variantType !=
-				    (oh ? oh->type : tags.extraObjectType))
-					T(YAFFS_TRACE_ERROR, (
-						TSTR("yaffs tragedy: Bad object type, "
-					    TCONT("%d != %d, for object %d at chunk ")
-					    TCONT("%d during scan")
-						TENDSTR), oh ?
-					    oh->type : tags.extraObjectType,
-					    in->variantType, tags.objectId,
-					    chunk));
-
-				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->hdrChunk = chunk;
-
-				} else if (!in->valid) {
-					/* we need to load this info */
-
-					in->valid = 1;
-					in->hdrChunk = 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;
-
-					if (!parent)
-						alloc_failed = 1;
-
-					/* directory stuff...
-					 * hook up to parent
-					 */
-
-					if (parent && parent->variantType ==
-					    YAFFS_OBJECT_TYPE_UNKNOWN) {
-						/* Set up as a directory */
-						parent->variantType =
-							YAFFS_OBJECT_TYPE_DIRECTORY;
-						YINIT_LIST_HEAD(&parent->variant.
-							directoryVariant.
-							children);
-					} else if (!parent || 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 = fileSize;
-						}
-
-						if (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 ylist_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);
-		}
-
-	}
-	
-	yaffs_SkipRestOfBlock(dev);
-
-	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);
-
-
-	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_VerifyObjectInDirectory(yaffs_Object *obj)
-{
-	struct ylist_head *lh;
-	yaffs_Object *listObj;
-
-	int count = 0;
-
-	if (!obj) {
-		T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
-		YBUG();
-		return;
-	}
-
-	if (yaffs_SkipVerification(obj->myDev))
-		return;
-
-	if (!obj->parent) {
-		T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
-		YBUG();
-		return;
-	}
-
-	if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
-		YBUG();
-	}
-
-	/* Iterate through the objects in each hash entry */
-
-	ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
-		if (lh) {
-			listObj = ylist_entry(lh, yaffs_Object, siblings);
-			yaffs_VerifyObject(listObj);
-			if (obj == listObj)
-				count++;
-		}
-	 }
-
-	if (count != 1) {
-		T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
-		YBUG();
-	}
-}
-
-static void yaffs_VerifyDirectory(yaffs_Object *directory)
-{
-	struct ylist_head *lh;
-	yaffs_Object *listObj;
-
-	if (!directory) {
-		YBUG();
-		return;
-	}
-
-	if (yaffs_SkipFullVerification(directory->myDev))
-		return;
-
-	if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-		T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
-		YBUG();
-	}
-
-	/* Iterate through the objects in each hash entry */
-
-	ylist_for_each(lh, &directory->variant.directoryVariant.children) {
-		if (lh) {
-			listObj = ylist_entry(lh, yaffs_Object, siblings);
-			if (listObj->parent != directory) {
-				T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
-				YBUG();
-			}
-			yaffs_VerifyObjectInDirectory(listObj);
-		}
-	}
-}
-
 /*
  *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
  * link (ie. name) is created or deleted in the directory.
@@ -7293,26 +4417,28 @@ static void yaffs_VerifyDirectory(yaffs_Object *directory)
  * If the directory updating is defered then yaffs_UpdateDirtyDirecories must be
  * called periodically.
  */
- 
+
 static void yaffs_UpdateParent(yaffs_Object *obj)
 {
 	yaffs_Device *dev;
 	if(!obj)
 		return;
+#ifndef CONFIG_YAFFS_WINCE
 
 	dev = obj->myDev;
 	obj->dirty = 1;
 	obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
 	if(dev->param.deferDirectoryUpdate){
-		struct ylist_head *link = &obj->variant.directoryVariant.dirty; 
-	
+		struct ylist_head *link = &obj->variant.directoryVariant.dirty;
+
 		if(ylist_empty(link)){
 			ylist_add(link,&dev->dirtyDirectories);
 			T(YAFFS_TRACE_BACKGROUND, (TSTR("Added object %d to dirty directories" TENDSTR),obj->objectId));
 		}
 
 	} else
-		yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
+		yaffs_UpdateObjectHeader(obj, NULL, 0, 0, 0, NULL);
+#endif
 }
 
 void yaffs_UpdateDirtyDirectories(yaffs_Device *dev)
@@ -7327,7 +4453,7 @@ void yaffs_UpdateDirtyDirectories(yaffs_Device *dev)
 	while(!ylist_empty(&dev->dirtyDirectories)){
 		link = dev->dirtyDirectories.next;
 		ylist_del_init(link);
-		
+
 		dS=ylist_entry(link,yaffs_DirectoryStructure,dirty);
 		oV = ylist_entry(dS,yaffs_ObjectVariant,directoryVariant);
 		obj = ylist_entry(oV,yaffs_Object,variant);
@@ -7335,7 +4461,7 @@ void yaffs_UpdateDirtyDirectories(yaffs_Device *dev)
 		T(YAFFS_TRACE_BACKGROUND, (TSTR("Update directory %d" TENDSTR), obj->objectId));
 
 		if(obj->dirty)
-			yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
+			yaffs_UpdateObjectHeader(obj, NULL, 0, 0, 0, NULL);
 	}
 }
 
@@ -7355,11 +4481,11 @@ static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
 
 	ylist_del_init(&obj->siblings);
 	obj->parent = NULL;
-	
+
 	yaffs_VerifyDirectory(parent);
 }
 
-static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
+void yaffs_AddObjectToDirectory(yaffs_Object *directory,
 					yaffs_Object *obj)
 {
 	if (!directory) {
@@ -7513,36 +4639,124 @@ yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
 	return obj;
 }
 
-int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
-{
-	memset(name, 0, buffSize * sizeof(YCHAR));
-
-	yaffs_CheckObjectDetailsLoaded(obj);
+/*
+ *  A note or two on object names.
+ *  * If the object name is missing, we then make one up in the form objnnn
+ *
+ *  * ASCII names are stored in the object header's name field from byte zero
+ *  * Unicode names are historically stored starting from byte zero.
+ *
+ * Then there are automatic Unicode names...
+ * The purpose of these is to save names in a way that can be read as
+ * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
+ * system to share files.
+ *
+ * These automatic unicode are stored slightly differently...
+ *  - If the name can fit in the ASCII character space then they are saved as
+ *    ascii names as per above.
+ *  - If the name needs Unicode then the name is saved in Unicode
+ *    starting at oh->name[1].
 
-	if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
-		yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
-	} else if (obj->hdrChunk <= 0) {
+ */
+static void yaffs_FixNullName(yaffs_Object * obj,YCHAR * name, int buffSize)
+{
+	/* Create an object name if we could not find one. */
+	if(yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH) == 0){
 		YCHAR locName[20];
 		YCHAR numString[20];
 		YCHAR *x = &numString[19];
 		unsigned v = obj->objectId;
 		numString[19] = 0;
-		while (v > 0) {
+		while(v>0){
 			x--;
 			*x = '0' + (v % 10);
 			v /= 10;
 		}
 		/* make up a name */
 		yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
-		yaffs_strcat(locName, x);
+		yaffs_strcat(locName,x);
 		yaffs_strncpy(name, locName, buffSize - 1);
+	}
+}
+
+static void yaffs_LoadNameFromObjectHeader(yaffs_Device *dev,YCHAR *name, const YCHAR *ohName, int bufferSize)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+	if(dev->param.autoUnicode){
+		if(*ohName){
+			/* It is an ASCII name, so do an ASCII to unicode conversion */
+			const char *asciiOhName = (const char *)ohName;
+			int n = bufferSize - 1;
+			while(n > 0 && *asciiOhName){
+				*name = *asciiOhName;
+				name++;
+				asciiOhName++;
+				n--;
+			}
+		} else
+			yaffs_strncpy(name,ohName+1, bufferSize -1);
+	} else
+#endif
+		yaffs_strncpy(name, ohName, bufferSize - 1);
+}
+
+
+static void yaffs_LoadObjectHeaderFromName(yaffs_Device *dev, YCHAR *ohName, const YCHAR *name)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+
+	int isAscii;
+	YCHAR *w;
+
+	if(dev->param.autoUnicode){
+
+		isAscii = 1;
+		w = name;
+
+		/* Figure out if the name will fit in ascii character set */
+		while(isAscii && *w){
+			if((*w) & 0xff00)
+				isAscii = 0;
+			w++;
+		}
+
+		if(isAscii){
+			/* It is an ASCII name, so do a unicode to ascii conversion */
+			char *asciiOhName = (char *)ohName;
+			int n = YAFFS_MAX_NAME_LENGTH  - 1;
+			while(n > 0 && *name){
+				*asciiOhName= *name;
+				name++;
+				asciiOhName++;
+				n--;
+			}
+		} else{
+			/* It is a unicode name, so save starting at the second YCHAR */
+			*ohName = 0;
+			yaffs_strncpy(ohName+1,name, YAFFS_MAX_NAME_LENGTH -2);
+		}
+	}
+	else
+#endif
+		yaffs_strncpy(ohName,name, YAFFS_MAX_NAME_LENGTH - 1);
 
+}
+
+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);
 	}
 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
-	else if (obj->shortName[0])
-		yaffs_strncpy(name, obj->shortName,YAFFS_SHORT_NAME_LENGTH+1);
+	else if (obj->shortName[0]) {
+		yaffs_strcpy(name, obj->shortName);
+	}
 #endif
-	else {
+	else if(obj->hdrChunk > 0) {
 		int result;
 		__u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
 
@@ -7555,15 +4769,17 @@ int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
 							obj->hdrChunk, buffer,
 							NULL);
 		}
-		yaffs_strncpy(name, oh->name, buffSize - 1);
-		name[buffSize-1]=0;
+		yaffs_LoadNameFromObjectHeader(obj->myDev,name,oh->name,buffSize);
 
 		yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
 	}
 
-	return yaffs_strnlen(name,buffSize-1);
+	yaffs_FixNullName(obj,name,buffSize);
+
+	return yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH);
 }
 
+
 int yaffs_GetObjectFileLength(yaffs_Object *obj)
 {
 	/* Dereference any hard linking */
@@ -7666,7 +4882,7 @@ int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
 	if (valid & ATTR_SIZE)
 		yaffs_ResizeFile(obj, attr->ia_size);
 
-	yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
+	yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0, NULL);
 
 	return YAFFS_OK;
 
@@ -7699,6 +4915,123 @@ int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
 
 #endif
 
+
+static int yaffs_DoXMod(yaffs_Object *obj, int set, const YCHAR *name, const void *value, int size, int flags)
+{
+	yaffs_XAttrMod xmod;
+
+	int result;
+
+	xmod.set = set;
+	xmod.name = name;
+	xmod.data = value;
+	xmod.size =  size;
+	xmod.flags = flags;
+	xmod.result = -ENOSPC;
+
+	result = yaffs_UpdateObjectHeader(obj, NULL, 0, 0, 0, &xmod);
+
+	if(result > 0)
+		return xmod.result;
+	else
+		return -ENOSPC;
+}
+
+static int yaffs_ApplyXMod(yaffs_Object *obj, char *buffer, yaffs_XAttrMod *xmod)
+{
+	int retval = 0;
+	int x_offs = sizeof(yaffs_ObjectHeader);
+	yaffs_Device *dev = obj->myDev;
+	int x_size = dev->nDataBytesPerChunk - sizeof(yaffs_ObjectHeader);
+
+	char * x_buffer = buffer + x_offs;
+
+	if(xmod->set)
+		retval = nval_set(x_buffer, x_size, xmod->name, xmod->data, xmod->size, xmod->flags);
+	else
+		retval = nval_del(x_buffer, x_size, xmod->name);
+
+	obj->hasXattr = nval_hasvalues(x_buffer, x_size);
+	obj->xattrKnown = 1;
+
+	xmod->result = retval;
+
+	return retval;
+}
+
+static int yaffs_DoXFetch(yaffs_Object *obj, const YCHAR *name, void *value, int size)
+{
+	char *buffer = NULL;
+	int result;
+	yaffs_ExtendedTags tags;
+	yaffs_Device *dev = obj->myDev;
+	int x_offs = sizeof(yaffs_ObjectHeader);
+	int x_size = dev->nDataBytesPerChunk - sizeof(yaffs_ObjectHeader);
+
+	char * x_buffer;
+
+	int retval = 0;
+
+	if(obj->hdrChunk < 1)
+		return -ENODATA;
+
+	/* If we know that the object has no xattribs then don't do all the
+	 * reading and parsing.
+	 */
+	if(obj->xattrKnown && !obj->hasXattr){
+		if(name)
+			return -ENODATA;
+		else
+			return 0;
+	}
+
+	buffer = (char *) yaffs_GetTempBuffer(dev, __LINE__);
+	if(!buffer)
+		return -ENOMEM;
+
+	result = yaffs_ReadChunkWithTagsFromNAND(dev,obj->hdrChunk, (__u8 *)buffer, &tags);
+
+	if(result != YAFFS_OK)
+		retval = -ENOENT;
+	else{
+		x_buffer =  buffer + x_offs;
+
+		if (!obj->xattrKnown){
+			obj->hasXattr = nval_hasvalues(x_buffer, x_size);
+			obj->xattrKnown = 1;
+		}
+
+		if(name)
+			retval = nval_get(x_buffer, x_size, name, value, size);
+		else
+			retval = nval_list(x_buffer, x_size, value,size);
+	}
+	yaffs_ReleaseTempBuffer(dev,(__u8 *)buffer,__LINE__);
+	return retval;
+}
+
+int yaffs_SetXAttribute(yaffs_Object *obj, const YCHAR *name, const void * value, int size, int flags)
+{
+	return yaffs_DoXMod(obj, 1, name, value, size, flags);
+}
+
+int yaffs_RemoveXAttribute(yaffs_Object *obj, const YCHAR *name)
+{
+	return yaffs_DoXMod(obj, 0, name, NULL, 0, 0);
+}
+
+int yaffs_GetXAttribute(yaffs_Object *obj, const YCHAR *name, void *value, int size)
+{
+	return yaffs_DoXFetch(obj, name, value, size);
+}
+
+int yaffs_ListXAttributes(yaffs_Object *obj, char *buffer, int size)
+{
+	return yaffs_DoXFetch(obj, NULL, buffer,size);
+}
+
+
+
 #if 0
 int yaffs_DumpObject(yaffs_Object *obj)
 {
@@ -7914,6 +5247,9 @@ int yaffs_GutsInitialise(yaffs_Device *dev)
 	else
 		dev->chunkGroupBits = bits - dev->tnodeWidth;
 
+	dev->tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
+	if(dev->tnodeSize < sizeof(yaffs_Tnode))
+		dev->tnodeSize = sizeof(yaffs_Tnode);
 
 	dev->chunkGroupSize = 1 << dev->chunkGroupBits;
 
@@ -8003,8 +5339,7 @@ int yaffs_GutsInitialise(yaffs_Device *dev)
 	if (!init_failed && !yaffs_InitialiseBlocks(dev))
 		init_failed = 1;
 
-	yaffs_InitialiseTnodes(dev);
-	yaffs_InitialiseObjects(dev);
+	yaffs_InitialiseTnodesAndObjects(dev);
 
 	if (!init_failed && !yaffs_CreateInitialDirectories(dev))
 		init_failed = 1;
@@ -8013,7 +5348,7 @@ int yaffs_GutsInitialise(yaffs_Device *dev)
 	if (!init_failed) {
 		/* Now scan the flash. */
 		if (dev->param.isYaffs2) {
-			if (yaffs_CheckpointRestore(dev)) {
+			if (yaffs2_CheckpointRestore(dev)) {
 				yaffs_CheckObjectDetailsLoaded(dev->rootDir);
 				T(YAFFS_TRACE_ALWAYS,
 				  (TSTR("yaffs: restored from checkpoint" TENDSTR)));
@@ -8023,9 +5358,8 @@ int yaffs_GutsInitialise(yaffs_Device *dev)
 				 * and scan backwards.
 				 */
 				yaffs_DeinitialiseBlocks(dev);
-				yaffs_DeinitialiseTnodes(dev);
-				yaffs_DeinitialiseObjects(dev);
 
+				yaffs_DeinitialiseTnodesAndObjects(dev);
 
 				dev->nErasedBlocks = 0;
 				dev->nFreeChunks = 0;
@@ -8038,16 +5372,15 @@ int yaffs_GutsInitialise(yaffs_Device *dev)
 				if (!init_failed && !yaffs_InitialiseBlocks(dev))
 					init_failed = 1;
 
-				yaffs_InitialiseTnodes(dev);
-				yaffs_InitialiseObjects(dev);
+				yaffs_InitialiseTnodesAndObjects(dev);
 
 				if (!init_failed && !yaffs_CreateInitialDirectories(dev))
 					init_failed = 1;
 
-				if (!init_failed && !yaffs_ScanBackwards(dev))
+				if (!init_failed && !yaffs2_ScanBackwards(dev))
 					init_failed = 1;
 			}
-		} else if (!yaffs_Scan(dev))
+		} else if (!yaffs1_Scan(dev))
 				init_failed = 1;
 
 		yaffs_StripDeletedObjects(dev);
@@ -8079,7 +5412,7 @@ int yaffs_GutsInitialise(yaffs_Device *dev)
 
 	/* Clean up any aborted checkpoint data */
 	if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
-		yaffs_InvalidateCheckpoint(dev);
+		yaffs2_InvalidateCheckpoint(dev);
 
 	T(YAFFS_TRACE_TRACING,
 	  (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
@@ -8093,8 +5426,7 @@ void yaffs_Deinitialise(yaffs_Device *dev)
 		int i;
 
 		yaffs_DeinitialiseBlocks(dev);
-		yaffs_DeinitialiseTnodes(dev);
-		yaffs_DeinitialiseObjects(dev);
+		yaffs_DeinitialiseTnodesAndObjects(dev);
 		if (dev->param.nShortOpCaches > 0 &&
 		    dev->srCache) {
 
@@ -8120,7 +5452,7 @@ void yaffs_Deinitialise(yaffs_Device *dev)
 	}
 }
 
-static int yaffs_CountFreeChunks(yaffs_Device *dev)
+int yaffs_CountFreeChunks(yaffs_Device *dev)
 {
 	int nFree=0;
 	int b;
@@ -8176,9 +5508,7 @@ int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
 	nFree -= ((dev->param.nReservedBlocks + 1) * dev->param.nChunksPerBlock);
 
 	/* Now we figure out how much to reserve for the checkpoint and report that... */
-	blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
-	if (blocksForCheckpoint < 0)
-		blocksForCheckpoint = 0;
+	blocksForCheckpoint = yaffs2_CalcCheckpointBlocksRequired(dev);
 
 	nFree -= (blocksForCheckpoint * dev->param.nChunksPerBlock);
 
@@ -8189,27 +5519,6 @@ int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
 
 }
 
-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 ----------------------*/
 
@@ -8227,9 +5536,8 @@ 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
+
 #ifndef CONFIG_YAFFS_WINCE
 	yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");
 #endif
diff --git a/fs/yaffs2/yaffs_guts.h b/fs/yaffs2/yaffs_guts.h
index 3647d6bce6cd..caf1e589b7c6 100644
--- a/fs/yaffs2/yaffs_guts.h
+++ b/fs/yaffs2/yaffs_guts.h
@@ -16,8 +16,9 @@
 #ifndef __YAFFS_GUTS_H__
 #define __YAFFS_GUTS_H__
 
-#include "devextras.h"
 #include "yportenv.h"
+#include "devextras.h"
+#include "yaffs_list.h"
 
 #define YAFFS_OK	1
 #define YAFFS_FAIL  0
@@ -52,7 +53,6 @@
 
 #define YAFFS_MAX_CHUNK_ID		0x000FFFFF
 
-#define YAFFS_UNUSED_OBJECT_ID		0x0003FFFF
 
 #define YAFFS_ALLOCATION_NOBJECTS	100
 #define YAFFS_ALLOCATION_NTNODES	100
@@ -62,6 +62,7 @@
 
 
 #define YAFFS_OBJECT_SPACE		0x40000
+#define YAFFS_MAX_OBJECT_ID		(YAFFS_OBJECT_SPACE -1)
 
 #define YAFFS_CHECKPOINT_VERSION 	4
 
@@ -350,23 +351,12 @@ typedef struct {
 /*--------------------------- 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:
@@ -428,6 +418,9 @@ struct yaffs_ObjectStruct {
 	__u8 beingCreated:1;	/* This object is still being created so skip some checks. */
 	__u8 isShadowed:1;	/* This object is shadowed on the way to being renamed. */
 
+	__u8 xattrKnown:1;	/* We know if this has object has xattribs or not. */
+	__u8 hasXattr:1;	/* This object has xattribs. Valid if xattrKnown. */
+
 	__u8 serial;		/* serial number of chunk in NAND. Cached here */
 	__u16 sum;		/* sum of the name to speed searching */
 
@@ -479,13 +472,6 @@ struct yaffs_ObjectStruct {
 
 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 ylist_head list;
 	int count;
@@ -529,7 +515,7 @@ typedef struct {
 
 
 struct yaffs_DeviceParamStruct {
-	const char *name;
+	const YCHAR *name;
 
 	/*
          * Entry parameters set up way early. Yaffs sets up the rest.
@@ -552,7 +538,7 @@ struct yaffs_DeviceParamStruct {
                                  * 10 to 20 is a good bet.
 				 */
 	int useNANDECC;		/* Flag to decide whether or not to use NANDECC on data (yaffs1) */
-	int noTagsECC;		/* Flag to decide whether or not to do ECC on packed tags (yaffs2) */ 
+	int noTagsECC;		/* Flag to decide whether or not to do ECC on packed tags (yaffs2) */
 
 	int isYaffs2;           /* Use yaffs2 mode on this device */
 
@@ -564,6 +550,8 @@ struct yaffs_DeviceParamStruct {
 	__u8 skipCheckpointRead;
 	__u8 skipCheckpointWrite;
 
+	int enableXattr;	/* Enable xattribs */
+
 	/* NAND access functions (Must be set before calling YAFFS)*/
 
 	int (*writeChunkToNAND) (struct yaffs_DeviceStruct *dev,
@@ -598,7 +586,7 @@ struct yaffs_DeviceParamStruct {
 
 	/* Callback to mark the superblock dirty */
 	void (*markSuperBlockDirty)(struct yaffs_DeviceStruct *dev);
-	
+
 	/*  Callback to control garbage collection. */
 	unsigned (*gcControl)(struct yaffs_DeviceStruct *dev);
 
@@ -607,9 +595,13 @@ struct yaffs_DeviceParamStruct {
 	int disableLazyLoad;	/* Disable lazy loading on this device */
 	int wideTnodesDisabled; /* Set to disable wide tnodes */
 	int disableSoftDelete;  /* yaffs 1 only: Set to disable the use of softdeletion. */
-	
+
 	int deferDirectoryUpdate; /* Set to defer directory updates */
-	
+
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+	int autoUnicode;
+#endif
+	int alwaysCheckErased; /* Force chunk erased check always on */
 };
 
 typedef struct yaffs_DeviceParamStruct yaffs_DeviceParam;
@@ -619,10 +611,13 @@ struct yaffs_DeviceStruct {
 
         /* Context storage. Holds extra OS specific data for this device */
 
-	void *context;
+	void *osContext;
+	void *driverContext;
+
+	struct ylist_head devList;
 
 	/* Runtime parameters. Set up by YAFFS. */
-	int nDataBytesPerChunk;	
+	int nDataBytesPerChunk;
 
         /* Non-wide tnode stuff */
 	__u16 chunkGroupBits;	/* Number of bits that need to be resolved if
@@ -633,6 +628,7 @@ struct yaffs_DeviceStruct {
 	/* Stuff to support wide tnodes */
 	__u32 tnodeWidth;
 	__u32 tnodeMask;
+	__u32 tnodeSize;
 
 	/* Stuff for figuring out file offset to chunk conversions */
 	__u32 chunkShift; /* Shift value */
@@ -684,19 +680,13 @@ struct yaffs_DeviceStruct {
 	__u32 allocationPage;
 	int allocationBlockFinder;	/* Used to search for next allocation block */
 
-	int nTnodesCreated;
-	yaffs_Tnode *freeTnodes;
-	int nFreeTnodes;
-	yaffs_TnodeList *allocatedTnodeList;
-
-	int nObjectsCreated;
-	yaffs_Object *freeObjects;
-	int nFreeObjects;
+	/* Object and Tnode memory management */
+	void *allocator;
+	int nObjects;
+	int nTnodes;
 
 	int nHardLinks;
 
-	yaffs_ObjectList *allocatedObjectList;
-
 	yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS];
 	__u32 bucketFinder;
 
@@ -704,6 +694,7 @@ struct yaffs_DeviceStruct {
 
 	/* Garbage collection control */
 	__u32 *gcCleanupList;	/* objects to delete at the end of a GC. */
+	__u32 nCleanups;
 
 	unsigned hasPendingPrioritisedGCs; /* We think this device might have pending prioritised gcs */
 	unsigned gcDisable;
@@ -766,6 +757,7 @@ struct yaffs_DeviceStruct {
 	__u32 allGCs;
 	__u32 passiveGCs;
 	__u32 oldestDirtyGCs;
+	__u32 nGCBlocks;
 	__u32 backgroundGCs;
 	__u32 nRetriedWrites;
 	__u32 nRetiredBlocks;
@@ -821,6 +813,23 @@ typedef struct {
 } yaffs_CheckpointValidity;
 
 
+struct yaffs_ShadowFixerStruct {
+	int objectId;
+	int shadowedId;
+	struct yaffs_ShadowFixerStruct *next;
+};
+
+/* Structure for doing xattr modifications */
+typedef struct {
+	int set; /* If 0 then this is a deletion */
+	const YCHAR *name;
+	const void *data;
+	int size;
+	int flags;
+	int result;
+}yaffs_XAttrMod;
+
+
 /*----------------------- YAFFS Functions -----------------------*/
 
 int yaffs_GutsInitialise(yaffs_Device *dev);
@@ -886,6 +895,12 @@ YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj);
 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
 				 __u32 mode, __u32 uid, __u32 gid, __u32 rdev);
 
+
+int yaffs_SetXAttribute(yaffs_Object *obj, const YCHAR *name, const void * value, int size, int flags);
+int yaffs_GetXAttribute(yaffs_Object *obj, const YCHAR *name, void *value, int size);
+int yaffs_ListXAttributes(yaffs_Object *obj, char *buffer, int size);
+int yaffs_RemoveXAttribute(yaffs_Object *obj, const YCHAR *name);
+
 /* Special directories */
 yaffs_Object *yaffs_Root(yaffs_Device *dev);
 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev);
@@ -906,8 +921,7 @@ int yaffs_DumpObject(yaffs_Object *obj);
 
 void yaffs_GutsTest(yaffs_Device *dev);
 
-/* A few useful functions */
-void yaffs_InitialiseTags(yaffs_ExtendedTags *tags);
+/* A few useful functions to be used within the core files*/
 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);
@@ -915,5 +929,41 @@ void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi);
 __u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo);
 void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer, int lineNo);
 
+yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
+					        int number,
+					        yaffs_ObjectType type);
+int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
+			        int chunkInNAND, int inScan);
+void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name);
+void yaffs_SetObjectNameFromOH(yaffs_Object *obj, const yaffs_ObjectHeader *oh);
+void yaffs_AddObjectToDirectory(yaffs_Object *directory,
+					yaffs_Object *obj);
+YCHAR *yaffs_CloneString(const YCHAR *str);
+void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
+void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo);
+int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name,
+				int force, int isShrink, int shadows,
+                                yaffs_XAttrMod *xop);
+void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
+				int backwardScanning);
+int yaffs_CheckSpaceForAllocation(yaffs_Device *dev, int nChunks);
+yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev);
+yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
+					yaffs_FileStructure *fStruct,
+					__u32 chunkId,
+					yaffs_Tnode *passedTn);
+
+int yaffs_DoWriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
+			int nBytes, int writeThrough);
+void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize);
+void yaffs_SkipRestOfBlock(yaffs_Device *dev);
+
+int yaffs_CountFreeChunks(yaffs_Device *dev);
+
+yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
+				yaffs_FileStructure *fStruct,
+				__u32 chunkId);
+
+__u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos);
 
 #endif
diff --git a/fs/yaffs2/yaffs_linux.h b/fs/yaffs2/yaffs_linux.h
index 4434e6c497b9..ce059fd23b7e 100644
--- a/fs/yaffs2/yaffs_linux.h
+++ b/fs/yaffs2/yaffs_linux.h
@@ -29,14 +29,15 @@ struct yaffs_LinuxContext {
 	__u8 *spareBuffer;      /* For mtdif2 use. Don't know the size of the buffer
 				 * at compile time so we have to allocate it.
 				 */
-	struct mtd_info *mtd;
 	struct ylist_head searchContexts;
 	void (*putSuperFunc)(struct super_block *sb);
 
 	struct task_struct *readdirProcess;
+	unsigned mount_id;
 };
 
-#define yaffs_DeviceToContext(dev) ((struct yaffs_LinuxContext *)((dev)->context))
+#define yaffs_DeviceToLC(dev) ((struct yaffs_LinuxContext *)((dev)->osContext))
+#define yaffs_DeviceToMtd(dev) ((struct mtd_info *)((dev)->driverContext))
 
 #endif
 
diff --git a/fs/yaffs2/yaffs_linux_allocator.c b/fs/yaffs2/yaffs_linux_allocator.c
new file mode 100644
index 000000000000..41281f33c1ac
--- /dev/null
+++ b/fs/yaffs2/yaffs_linux_allocator.c
@@ -0,0 +1,202 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 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.
+ */
+
+/*
+ * Note: Tis code is currently unused. Being checked in in case it becomes useful.
+ */
+
+
+#include "yaffs_allocator.h"
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yportenv.h"
+#include "yaffs_linux.h"
+/*
+ * Start out with the same allocator as yaffs direct.
+ * Todo: Change to Linux slab allocator.
+ */
+
+
+
+#define NAMELEN  20
+struct yaffs_AllocatorStruct {
+	char tnode_name[NAMELEN+1];
+	char object_name[NAMELEN+1];
+	struct kmem_cache *tnode_cache;
+	struct kmem_cache *object_cache;
+};
+
+typedef struct yaffs_AllocatorStruct yaffs_Allocator;
+
+int mount_id;
+
+void yaffs_DeinitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator;
+
+	T(YAFFS_TRACE_ALLOCATE,(TSTR("Deinitialising yaffs allocator\n")));
+
+	if(allocator){
+		if(allocator->tnode_cache){
+			kmem_cache_destroy(allocator->tnode_cache);
+			allocator->tnode_cache = NULL;
+		} else {
+			T(YAFFS_TRACE_ALWAYS,
+				(TSTR("NULL tnode cache\n")));
+			YBUG();
+		}
+
+		if(allocator->object_cache){
+			kmem_cache_destroy(allocator->object_cache);
+			allocator->object_cache = NULL;
+		} else {
+			T(YAFFS_TRACE_ALWAYS,
+				(TSTR("NULL object cache\n")));
+			YBUG();
+		}
+
+		YFREE(allocator);
+
+	} else {
+		T(YAFFS_TRACE_ALWAYS,
+			(TSTR("Deinitialising NULL allocator\n")));
+		YBUG();
+	}
+	dev->allocator = NULL;
+}
+
+
+static void fake_ctor0(void *data){data = data;}
+static void fake_ctor1(void *data){data = data;}
+static void fake_ctor2(void *data){data = data;}
+static void fake_ctor3(void *data){data = data;}
+static void fake_ctor4(void *data){data = data;}
+static void fake_ctor5(void *data){data = data;}
+static void fake_ctor6(void *data){data = data;}
+static void fake_ctor7(void *data){data = data;}
+static void fake_ctor8(void *data){data = data;}
+static void fake_ctor9(void *data){data = data;}
+
+static void (*fake_ctor_list[10]) (void *) = {
+	fake_ctor0,
+	fake_ctor1,
+	fake_ctor2,
+	fake_ctor3,
+	fake_ctor4,
+	fake_ctor5,
+	fake_ctor6,
+	fake_ctor7,
+	fake_ctor8,
+	fake_ctor9,
+};
+
+void yaffs_InitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator;
+	unsigned mount_id = yaffs_DeviceToLC(dev)->mount_id;
+
+	T(YAFFS_TRACE_ALLOCATE,(TSTR("Initialising yaffs allocator\n")));
+
+	if(dev->allocator)
+		YBUG();
+	else if(mount_id >= 10){
+		T(YAFFS_TRACE_ALWAYS,(TSTR("Bad mount_id %u\n"),mount_id));
+	} else {
+		 allocator = YMALLOC(sizeof(yaffs_Allocator));
+		 memset(allocator,0,sizeof(yaffs_Allocator));
+		 dev->allocator = allocator;
+
+		if(!dev->allocator){
+			T(YAFFS_TRACE_ALWAYS,
+				(TSTR("yaffs allocator creation failed\n")));
+			YBUG();
+			return;
+
+		}
+
+		sprintf(allocator->tnode_name,"yaffs_t_%u",mount_id);
+		sprintf(allocator->object_name,"yaffs_o_%u",mount_id);
+
+		allocator->tnode_cache =
+			kmem_cache_create(allocator->tnode_name,
+				dev->tnodeSize,
+				0, 0,
+				fake_ctor_list[mount_id]);
+		if(allocator->tnode_cache)
+			T(YAFFS_TRACE_ALLOCATE,
+				(TSTR("tnode cache \"%s\" %p\n"),
+				allocator->tnode_name,allocator->tnode_cache));
+		else {
+			T(YAFFS_TRACE_ALWAYS,
+				(TSTR("yaffs cache creation failed\n")));
+			YBUG();
+		}
+
+
+		allocator->object_cache =
+			kmem_cache_create(allocator->object_name,
+				sizeof(yaffs_Object),
+				0, 0,
+				fake_ctor_list[mount_id]);
+
+		if(allocator->object_cache)
+			T(YAFFS_TRACE_ALLOCATE,
+				(TSTR("object cache \"%s\" %p\n"),
+				allocator->object_name,allocator->object_cache));
+
+		else {
+			T(YAFFS_TRACE_ALWAYS,
+				(TSTR("yaffs cache creation failed\n")));
+			YBUG();
+		}
+	}
+}
+
+
+yaffs_Tnode *yaffs_AllocateRawTnode(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+	if(!allocator || !allocator->tnode_cache){
+		YBUG();
+		return NULL;
+	}
+	return kmem_cache_alloc(allocator->tnode_cache, GFP_NOFS);
+}
+
+void yaffs_FreeRawTnode(yaffs_Device *dev, yaffs_Tnode *tn)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+	kmem_cache_free(allocator->tnode_cache,tn);
+}
+
+yaffs_Object *yaffs_AllocateRawObject(yaffs_Device *dev)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+	if(!allocator){
+		YBUG();
+		return NULL;
+	}
+	if(!allocator->object_cache){
+		YBUG();
+		return NULL;
+	}
+	return kmem_cache_alloc(allocator->object_cache, GFP_NOFS);
+}
+
+void yaffs_FreeRawObject(yaffs_Device *dev, yaffs_Object *obj)
+{
+	yaffs_Allocator *allocator = dev->allocator;
+	kmem_cache_free(allocator->object_cache,obj);
+}
diff --git a/fs/yaffs2/yaffs_list.h b/fs/yaffs2/yaffs_list.h
new file mode 100644
index 000000000000..09d80b856224
--- /dev/null
+++ b/fs/yaffs2/yaffs_list.h
@@ -0,0 +1,127 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 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 of macros that would normally
+ * be providesd in the Linux kernel. These macros have been written from
+ * scratch but are functionally equivalent to the Linux ones.
+ *
+ */
+
+#ifndef __YAFFS_LIST_H__
+#define __YAFFS_LIST_H__
+
+
+#include "yportenv.h"
+
+/*
+ * This is a simple doubly linked list implementation that matches the
+ * way the Linux kernel doubly linked list implementation works.
+ */
+
+struct ylist_head {
+	struct ylist_head *next; /* next in chain */
+	struct ylist_head *prev; /* previous in chain */
+};
+
+
+/* Initialise a static list */
+#define YLIST_HEAD(name) \
+struct ylist_head name = { &(name), &(name)}
+
+
+
+/* Initialise a list head to an empty list */
+#define YINIT_LIST_HEAD(p) \
+do { \
+	(p)->next = (p);\
+	(p)->prev = (p); \
+} while (0)
+
+
+/* Add an element to a list */
+static Y_INLINE void ylist_add(struct ylist_head *newEntry,
+				struct ylist_head *list)
+{
+	struct ylist_head *listNext = list->next;
+
+	list->next = newEntry;
+	newEntry->prev = list;
+	newEntry->next = listNext;
+	listNext->prev = newEntry;
+
+}
+
+static Y_INLINE void ylist_add_tail(struct ylist_head *newEntry,
+				 struct ylist_head *list)
+{
+	struct ylist_head *listPrev = list->prev;
+
+	list->prev = newEntry;
+	newEntry->next = list;
+	newEntry->prev = listPrev;
+	listPrev->next = newEntry;
+
+}
+
+
+/* Take an element out of its current list, with or without
+ * reinitialising the links.of the entry*/
+static Y_INLINE void ylist_del(struct ylist_head *entry)
+{
+	struct ylist_head *listNext = entry->next;
+	struct ylist_head *listPrev = entry->prev;
+
+	listNext->prev = listPrev;
+	listPrev->next = listNext;
+
+}
+
+static Y_INLINE void ylist_del_init(struct ylist_head *entry)
+{
+	ylist_del(entry);
+	entry->next = entry->prev = entry;
+}
+
+
+/* Test if the list is empty */
+static Y_INLINE int ylist_empty(struct ylist_head *entry)
+{
+	return (entry->next == entry);
+}
+
+
+/* ylist_entry takes a pointer to a list entry and offsets it to that
+ * we can find a pointer to the object it is embedded in.
+ */
+
+
+#define ylist_entry(entry, type, member) \
+	((type *)((char *)(entry)-(unsigned long)(&((type *)NULL)->member)))
+
+
+/* ylist_for_each and list_for_each_safe  iterate over lists.
+ * ylist_for_each_safe uses temporary storage to make the list delete safe
+ */
+
+#define ylist_for_each(itervar, list) \
+	for (itervar = (list)->next; itervar != (list); itervar = itervar->next)
+
+#define ylist_for_each_safe(itervar, saveVar, list) \
+	for (itervar = (list)->next, saveVar = (list)->next->next; \
+		itervar != (list); itervar = saveVar, saveVar = saveVar->next)
+
+
+#endif
diff --git a/fs/yaffs2/yaffs_mtdif.c b/fs/yaffs2/yaffs_mtdif.c
index 5de3193ea2b9..9ed50bad234a 100644
--- a/fs/yaffs2/yaffs_mtdif.c
+++ b/fs/yaffs2/yaffs_mtdif.c
@@ -25,12 +25,12 @@
 
 int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
 {
-	struct mtd_info *mtd = yaffs_DeviceToContext(dev)->mtd;
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 	__u32 addr =
 	    ((loff_t) blockNumber) * dev->param.totalBytesPerChunk
 		* dev->param.nChunksPerBlock;
 	struct erase_info ei;
-	
+
 	int retval = 0;
 
 	ei.mtd = mtd;
diff --git a/fs/yaffs2/yaffs_mtdif1.c b/fs/yaffs2/yaffs_mtdif1.c
index aaa02db2f665..3e2a10a62d67 100644
--- a/fs/yaffs2/yaffs_mtdif1.c
+++ b/fs/yaffs2/yaffs_mtdif1.c
@@ -1,10 +1,11 @@
 /*
  * YAFFS: Yet another FFS. A NAND-flash specific file system.
- * yaffs_mtdif1.c  NAND mtd interface functions for small-page NAND.
  *
  * Copyright (C) 2002-2010 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.
@@ -91,7 +92,7 @@ static struct nand_ecclayout nand_oob_16 = {
 int nandmtd1_WriteChunkWithTagsToNAND(yaffs_Device *dev,
 	int chunkInNAND, const __u8 *data, const yaffs_ExtendedTags *etags)
 {
-	struct mtd_info *mtd = yaffs_DeviceToContext(dev)->mtd;
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 	int chunkBytes = dev->nDataBytesPerChunk;
 	loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
 	struct mtd_oob_ops ops;
@@ -169,7 +170,7 @@ static int rettags(yaffs_ExtendedTags *etags, int eccResult, int retval)
 int nandmtd1_ReadChunkWithTagsFromNAND(yaffs_Device *dev,
 	int chunkInNAND, __u8 *data, yaffs_ExtendedTags *etags)
 {
-	struct mtd_info *mtd = yaffs_DeviceToContext(dev)->mtd;
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 	int chunkBytes = dev->nDataBytesPerChunk;
 	loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
 	int eccres = YAFFS_ECC_RESULT_NO_ERROR;
@@ -280,7 +281,7 @@ int nandmtd1_ReadChunkWithTagsFromNAND(yaffs_Device *dev,
  */
 int nandmtd1_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 {
-	struct mtd_info *mtd = yaffs_DeviceToContext(dev)->mtd;
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 	int blocksize = dev->param.nChunksPerBlock * dev->nDataBytesPerChunk;
 	int retval;
 
@@ -321,7 +322,7 @@ static int nandmtd1_TestPrerequists(struct mtd_info *mtd)
 int nandmtd1_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
 	yaffs_BlockState *pState, __u32 *pSequenceNumber)
 {
-	struct mtd_info *mtd = yaffs_DeviceToContext(dev)->mtd;
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 	int chunkNo = blockNo * dev->param.nChunksPerBlock;
 	loff_t addr = (loff_t)chunkNo * dev->nDataBytesPerChunk;
 	yaffs_ExtendedTags etags;
diff --git a/fs/yaffs2/yaffs_mtdif2.c b/fs/yaffs2/yaffs_mtdif2.c
index c1d447819970..2b0a601fb0c8 100644
--- a/fs/yaffs2/yaffs_mtdif2.c
+++ b/fs/yaffs2/yaffs_mtdif2.c
@@ -34,7 +34,7 @@ int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device *dev, int chunkInNAND,
 				      const __u8 *data,
 				      const yaffs_ExtendedTags *tags)
 {
-	struct mtd_info *mtd = yaffs_DeviceToContext(dev)->mtd;
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 #if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
 	struct mtd_oob_ops ops;
 #else
@@ -100,7 +100,7 @@ int nandmtd2_WriteChunkWithTagsToNAND(yaffs_Device *dev, int chunkInNAND,
 int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device *dev, int chunkInNAND,
 				       __u8 *data, yaffs_ExtendedTags *tags)
 {
-	struct mtd_info *mtd = yaffs_DeviceToContext(dev)->mtd;
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 #if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
 	struct mtd_oob_ops ops;
 #endif
@@ -141,7 +141,7 @@ int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device *dev, int chunkInNAND,
 		ops.len = data ? dev->nDataBytesPerChunk : packed_tags_size;
 		ops.ooboffs = 0;
 		ops.datbuf = data;
-		ops.oobbuf = yaffs_DeviceToContext(dev)->spareBuffer;
+		ops.oobbuf = yaffs_DeviceToLC(dev)->spareBuffer;
 		retval = mtd->read_oob(mtd, addr, &ops);
 	}
 #else
@@ -171,7 +171,7 @@ int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device *dev, int chunkInNAND,
 		}
 	} else {
 		if (tags) {
-			memcpy(packed_tags_ptr, yaffs_DeviceToContext(dev)->spareBuffer, packed_tags_size);
+			memcpy(packed_tags_ptr, yaffs_DeviceToLC(dev)->spareBuffer, packed_tags_size);
 			yaffs_UnpackTags2(tags, &pt, !dev->param.noTagsECC);
 		}
 	}
@@ -195,7 +195,7 @@ int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device *dev, int chunkInNAND,
 
 int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 {
-	struct mtd_info *mtd = yaffs_DeviceToContext(dev)->mtd;
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 	int retval;
 	T(YAFFS_TRACE_MTD,
 	  (TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), blockNo));
@@ -215,7 +215,7 @@ int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
 			    yaffs_BlockState *state, __u32 *sequenceNumber)
 {
-	struct mtd_info *mtd = yaffs_DeviceToContext(dev)->mtd;
+	struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 	int retval;
 
 	T(YAFFS_TRACE_MTD,
diff --git a/fs/yaffs2/yaffs_nameval.c b/fs/yaffs2/yaffs_nameval.c
new file mode 100644
index 000000000000..80a47609bab8
--- /dev/null
+++ b/fs/yaffs2/yaffs_nameval.c
@@ -0,0 +1,197 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This simple implementation of a name-value store assumes a small number of values and fits
+ * into a small finite buffer.
+ *
+ * Each attribute is stored as a record:
+ *  sizeof(int) bytes   record size.
+ *  strnlen+1 bytes name null terminated.
+ *  nbytes    value.
+ *  ----------
+ *  total size  stored in record size
+ *
+ * This code has not been tested with unicode yet.
+ */
+
+
+#include "yaffs_nameval.h"
+
+#include "yportenv.h"
+
+static int nval_find(const char *xb, int xb_size, const YCHAR *name,
+		int *exist_size)
+{
+	int pos=0;
+	int size;
+
+	memcpy(&size,xb,sizeof(int));
+	while(size > 0 && (size < xb_size) && (pos + size < xb_size)){
+		if(yaffs_strncmp((YCHAR *)(xb+pos+sizeof(int)),name,size) == 0){
+			if(exist_size)
+				*exist_size = size;
+			return pos;
+		}
+		pos += size;
+		if(pos < xb_size -sizeof(int))
+			memcpy(&size,xb + pos,sizeof(int));
+		else
+			size = 0;
+	}
+	if(exist_size)
+		*exist_size = 0;
+	return -1;
+}
+
+static int nval_used(const char *xb, int xb_size)
+{
+	int pos=0;
+	int size;
+
+	memcpy(&size,xb + pos,sizeof(int));
+	while(size > 0 && (size < xb_size) && (pos + size < xb_size)){
+		pos += size;
+		if(pos < xb_size -sizeof(int))
+			memcpy(&size,xb + pos,sizeof(int));
+		else
+			size = 0;
+	}
+	return pos;
+}
+
+int nval_del(char *xb, int xb_size, const YCHAR *name)
+{
+	int pos  = nval_find(xb, xb_size, name, NULL);
+	int size;
+
+	if(pos >= 0 && pos < xb_size){
+		/* Find size, shift rest over this record, then zero out the rest of buffer */
+		memcpy(&size,xb+pos,sizeof(int));
+		memcpy(xb + pos, xb + pos + size, xb_size - (pos + size));
+		memset(xb + (xb_size - size),0,size);
+		return 0;
+	} else
+		return -ENODATA;
+}
+
+int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf, int bsize, int flags)
+{
+	int pos;
+	int namelen = yaffs_strnlen(name,xb_size);
+	int reclen;
+	int size_exist = 0;
+	int space;
+	int start;
+
+	pos = nval_find(xb,xb_size,name, &size_exist);
+
+	if(flags & XATTR_CREATE && pos >= 0)
+		return -EEXIST;
+	if(flags & XATTR_REPLACE && pos < 0)
+		return -ENODATA;
+
+	start = nval_used(xb,xb_size);
+	space = xb_size - start + size_exist;
+
+	reclen = (sizeof(int) + namelen + 1 + bsize);
+
+	if(reclen > space)
+		return -ENOSPC;
+
+	if(pos >= 0){
+		nval_del(xb,xb_size,name);
+		start = nval_used(xb, xb_size);
+	}
+
+	pos = start;
+
+	memcpy(xb + pos,&reclen,sizeof(int));
+	pos +=sizeof(int);
+	yaffs_strncpy((YCHAR *)(xb + pos), name, reclen);
+	pos+= (namelen+1);
+	memcpy(xb + pos,buf,bsize);
+	return 0;
+}
+
+int nval_get(const char *xb, int xb_size, const YCHAR *name, char *buf, int bsize)
+{
+	int pos = nval_find(xb,xb_size,name,NULL);
+	int size;
+
+	if(pos >= 0 && pos< xb_size){
+
+		memcpy(&size,xb +pos,sizeof(int));
+		pos+=sizeof(int); /* advance past record length */
+		size -= sizeof(int);
+
+		/* Advance over name string */
+		while(xb[pos] && size > 0 && pos < xb_size){
+			pos++;
+			size--;
+		}
+		/*Advance over NUL */
+		pos++;
+		size--;
+
+		if(size <= bsize){
+			memcpy(buf,xb + pos,size);
+			return size;
+		}
+
+	}
+	if(pos >= 0)
+		return -ERANGE;
+	else
+		return -ENODATA;
+}
+
+int nval_list(const char *xb, int xb_size, char *buf, int bsize)
+{
+	int pos = 0;
+	int size;
+	int name_len;
+	int ncopied = 0;
+	int filled = 0;
+
+	memcpy(&size,xb + pos,sizeof(int));
+	while(size > sizeof(int) && size <= xb_size && (pos + size) < xb_size && !filled){
+		pos+= sizeof(int);
+		size-=sizeof(int);
+		name_len = yaffs_strnlen((YCHAR *)(xb + pos), size);
+		if(ncopied + name_len + 1 < bsize){
+			memcpy(buf,xb+pos,name_len * sizeof(YCHAR));
+			buf+= name_len;
+			*buf = '\0';
+			buf++;
+			if(sizeof(YCHAR) > 1){
+				*buf = '\0';
+				buf++;
+			}
+			ncopied += (name_len+1);
+		} else
+			filled = 1;
+		pos+=size;
+		if(pos < xb_size -sizeof(int))
+			memcpy(&size,xb + pos,sizeof(int));
+		else
+			size = 0;
+	}
+	return ncopied;
+}
+
+
+int nval_hasvalues(const char *xb, int xb_size)
+{
+	return nval_used(xb, xb_size) > 0;
+}
diff --git a/fs/yaffs2/yaffs_nameval.h b/fs/yaffs2/yaffs_nameval.h
new file mode 100644
index 000000000000..bd8085937eb3
--- /dev/null
+++ b/fs/yaffs2/yaffs_nameval.h
@@ -0,0 +1,26 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __NAMEVAL_H__
+#define __NAMEVAL_H__
+
+#include "yportenv.h"
+
+int nval_del(char *xb, int xb_size, const YCHAR *name);
+int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf, int bsize, int flags);
+int nval_get(const char *xb, int xb_size, const YCHAR *name, char *buf, int bsize);
+int nval_list(const char *xb, int xb_size, char *buf, int bsize);
+int nval_hasvalues(const char *xb, int xb_size);
+#endif
diff --git a/fs/yaffs2/yaffs_qsort.h b/fs/yaffs2/yaffs_qsort.h
index a24d58e37583..4a4981b3f9ad 100644
--- a/fs/yaffs2/yaffs_qsort.h
+++ b/fs/yaffs2/yaffs_qsort.h
@@ -17,7 +17,18 @@
 #ifndef __YAFFS_QSORT_H__
 #define __YAFFS_QSORT_H__
 
+#ifdef __KERNEL__
+#include <linux/sort.h>
+
+extern void yaffs_qsort(void *const base, size_t total_elems, size_t size,
+			int (*cmp)(const void *, const void *)){
+	sort(base, total_elems, size, cmp, NULL);
+}
+
+#else
+
 extern void yaffs_qsort(void *const base, size_t total_elems, size_t size,
 			int (*cmp)(const void *, const void *));
 
 #endif
+#endif
diff --git a/fs/yaffs2/yaffs_trace.h b/fs/yaffs2/yaffs_trace.h
index 8b848edba05e..94395a9a9547 100644
--- a/fs/yaffs2/yaffs_trace.h
+++ b/fs/yaffs2/yaffs_trace.h
@@ -54,6 +54,9 @@ extern unsigned int yaffs_wr_attempts;
 #define YAFFS_TRACE_BUG			0x80000000
 #define YAFFS_TRACE_ALWAYS		0xF0000000
 
+#ifdef T
+#undef T
+#endif
 
 #define T(mask, p) do { if ((mask) & (yaffs_traceMask | YAFFS_TRACE_ALWAYS)) TOUT(p); } while (0)
 
diff --git a/fs/yaffs2/yaffs_verify.c b/fs/yaffs2/yaffs_verify.c
new file mode 100644
index 000000000000..a600aa6b1e6b
--- /dev/null
+++ b/fs/yaffs2/yaffs_verify.c
@@ -0,0 +1,626 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+
+#include "yaffs_verify.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+
+int yaffs_SkipVerification(yaffs_Device *dev)
+{
+	dev=dev;
+	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_SkipFullVerification(yaffs_Device *dev)
+{
+	dev=dev;
+	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_SkipNANDVerification(yaffs_Device *dev)
+{
+	dev=dev;
+	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
+}
+
+
+static const char *blockStateName[] = {
+"Unknown",
+"Needs scanning",
+"Scanning",
+"Empty",
+"Allocating",
+"Full",
+"Dirty",
+"Checkpoint",
+"Collecting",
+"Dead"
+};
+
+
+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 >= 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->param.nChunksPerBlock ||
+	   bi->softDeletions < 0 || bi->softDeletions > dev->param.nChunksPerBlock ||
+	   actuallyUsed < 0 || actuallyUsed > dev->param.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));
+
+}
+
+
+
+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 */
+
+	if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
+			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));
+	}
+}
+
+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 < 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.
+ */
+void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
+{
+	if (obj && yaffs_SkipVerification(obj->myDev))
+		return;
+
+	if (!(tags && obj && oh)) {
+		T(YAFFS_TRACE_VERIFY,
+				(TSTR("Verifying object header tags %p obj %p oh %p"TENDSTR),
+				tags, obj, 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));
+}
+
+
+#if 0
+/* Not being used, but don't want to throw away yet */
+int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
+					__u32 level, int chunkOffset)
+{
+	int i;
+	yaffs_Device *dev = obj->myDev;
+	int ok = 1;
+
+	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) {
+			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;
+
+}
+
+#endif
+
+void yaffs_VerifyFile(yaffs_Object *obj)
+{
+	int requiredTallness;
+	int actualTallness;
+	__u32 lastChunk;
+	__u32 x;
+	__u32 i;
+	yaffs_Device *dev;
+	yaffs_ExtendedTags tags;
+	yaffs_Tnode *tn;
+	__u32 objectId;
+
+	if (!obj)
+		return;
+
+	if (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;
+
+	/* 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));
+				}
+			}
+		}
+	}
+}
+
+
+void yaffs_VerifyHardLink(yaffs_Object *obj)
+{
+	if (obj && yaffs_SkipVerification(obj->myDev))
+		return;
+
+	/* Verify sane equivalent object */
+}
+
+void yaffs_VerifySymlink(yaffs_Object *obj)
+{
+	if (obj && yaffs_SkipVerification(obj->myDev))
+		return;
+
+	/* Verify symlink string */
+}
+
+void yaffs_VerifySpecial(yaffs_Object *obj)
+{
+	if (obj && yaffs_SkipVerification(obj->myDev))
+		return;
+}
+
+void yaffs_VerifyObject(yaffs_Object *obj)
+{
+	yaffs_Device *dev;
+
+	__u32 chunkMin;
+	__u32 chunkMax;
+
+	__u32 chunkIdOk;
+	__u32 chunkInRange;
+	__u32 chunkShouldNotBeDeleted;
+	__u32 chunkValid;
+
+	if (!obj)
+		return;
+
+	if (obj->beingCreated)
+		return;
+
+	dev = obj->myDev;
+
+	if (yaffs_SkipVerification(dev))
+		return;
+
+	/* Check sane object header chunk */
+
+	chunkMin = dev->internalStartBlock * dev->param.nChunksPerBlock;
+	chunkMax = (dev->internalEndBlock+1) * dev->param.nChunksPerBlock - 1;
+
+	chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
+	chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
+	chunkValid = chunkInRange &&
+			yaffs_CheckChunkBit(dev,
+					obj->hdrChunk / dev->param.nChunksPerBlock,
+					obj->hdrChunk % dev->param.nChunksPerBlock);
+	chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
+
+	if (!obj->fake &&
+			(!chunkIdOk || chunkShouldNotBeDeleted)) {
+		T(YAFFS_TRACE_VERIFY,
+			(TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
+			obj->objectId, obj->hdrChunk,
+			chunkIdOk ? "" : ",out of range",
+			chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
+	}
+
+	if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
+		yaffs_ExtendedTags tags;
+		yaffs_ObjectHeader *oh;
+		__u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
+
+		oh = (yaffs_ObjectHeader *)buffer;
+
+		yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, 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;
+	}
+}
+
+void yaffs_VerifyObjects(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	int i;
+	struct ylist_head *lh;
+
+	if (yaffs_SkipVerification(dev))
+		return;
+
+	/* Iterate through the objects in each hash entry */
+
+	for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
+		ylist_for_each(lh, &dev->objectBucket[i].list) {
+			if (lh) {
+				obj = ylist_entry(lh, yaffs_Object, hashLink);
+				yaffs_VerifyObject(obj);
+			}
+		}
+	}
+}
+
+
+void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
+{
+	struct ylist_head *lh;
+	yaffs_Object *listObj;
+
+	int count = 0;
+
+	if (!obj) {
+		T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
+		YBUG();
+		return;
+	}
+
+	if (yaffs_SkipVerification(obj->myDev))
+		return;
+
+	if (!obj->parent) {
+		T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
+		YBUG();
+		return;
+	}
+
+	if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
+		YBUG();
+	}
+
+	/* Iterate through the objects in each hash entry */
+
+	ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
+		if (lh) {
+			listObj = ylist_entry(lh, yaffs_Object, siblings);
+			yaffs_VerifyObject(listObj);
+			if (obj == listObj)
+				count++;
+		}
+	 }
+
+	if (count != 1) {
+		T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
+		YBUG();
+	}
+}
+
+void yaffs_VerifyDirectory(yaffs_Object *directory)
+{
+	struct ylist_head *lh;
+	yaffs_Object *listObj;
+
+	if (!directory) {
+		YBUG();
+		return;
+	}
+
+	if (yaffs_SkipFullVerification(directory->myDev))
+		return;
+
+	if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
+		YBUG();
+	}
+
+	/* Iterate through the objects in each hash entry */
+
+	ylist_for_each(lh, &directory->variant.directoryVariant.children) {
+		if (lh) {
+			listObj = ylist_entry(lh, yaffs_Object, siblings);
+			if (listObj->parent != directory) {
+				T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
+				YBUG();
+			}
+			yaffs_VerifyObjectInDirectory(listObj);
+		}
+	}
+}
+
+static int yaffs_freeVerificationFailures;
+
+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++;
+	}
+}
+
+int yaffs_VerifyFileSanity(yaffs_Object *in)
+{
+#if 0
+	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)
+		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->param.nChunksPerBlock,
+			     theChunk % dev->param.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;
+#else
+	in=in;
+	return YAFFS_OK;
+#endif
+}
diff --git a/fs/yaffs2/yaffs_verify.h b/fs/yaffs2/yaffs_verify.h
new file mode 100644
index 000000000000..3dbcefd16644
--- /dev/null
+++ b/fs/yaffs2/yaffs_verify.h
@@ -0,0 +1,41 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_VERIFY_H__
+#define __YAFFS_VERIFY_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n);
+void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n);
+void yaffs_VerifyBlocks(yaffs_Device *dev);
+
+void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck);
+void yaffs_VerifyFile(yaffs_Object *obj);
+void yaffs_VerifyHardLink(yaffs_Object *obj);
+void yaffs_VerifySymlink(yaffs_Object *obj);
+void yaffs_VerifySpecial(yaffs_Object *obj);
+void yaffs_VerifyObject(yaffs_Object *obj);
+void yaffs_VerifyObjects(yaffs_Device *dev);
+void yaffs_VerifyObjectInDirectory(yaffs_Object *obj);
+void yaffs_VerifyDirectory(yaffs_Object *directory);
+void yaffs_VerifyFreeChunks(yaffs_Device *dev);
+
+int yaffs_VerifyFileSanity(yaffs_Object *obj);
+
+int yaffs_SkipVerification(yaffs_Device *dev);
+
+#endif
+
diff --git a/fs/yaffs2/yaffs_fs.c b/fs/yaffs2/yaffs_vfs_glue.c
index 11eca48d064f..e6dc6787f6a9 100644
--- a/fs/yaffs2/yaffs_fs.c
+++ b/fs/yaffs2/yaffs_vfs_glue.c
@@ -31,16 +31,36 @@
  * >> inode->u.generic_ip points to the associated yaffs_Object.
  */
 
+/*
+ * There are two variants of the VFS glue code. This variant should compile
+ * for any version of Linux.
+ */
 #include <linux/version.h>
 
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10))
 #define YAFFS_COMPILE_BACKGROUND
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6, 23))
+#define YAFFS_COMPILE_FREEZER
+#endif
 #endif
 
 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28))
 #define YAFFS_COMPILE_EXPORTFS
 #endif
 
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35))
+#define YAFFS_USE_SETATTR_COPY
+#define YAFFS_USE_TRUNCATE_SETSIZE
+#endif
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35))
+#define YAFFS_HAS_EVICT_INODE
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
+#define YAFFS_NEW_FOLLOW_LINK 1
+#else
+#define YAFFS_NEW_FOLLOW_LINK 0
+#endif
 
 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
 #include <linux/config.h>
@@ -59,6 +79,10 @@
 #include <linux/string.h>
 #include <linux/ctype.h>
 
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+#include <linux/namei.h>
+#endif
+
 #ifdef YAFFS_COMPILE_EXPORTFS
 #include <linux/exportfs.h>
 #endif
@@ -66,6 +90,8 @@
 #ifdef YAFFS_COMPILE_BACKGROUND
 #include <linux/kthread.h>
 #include <linux/delay.h>
+#endif
+#ifdef YAFFS_COMPILE_FREEZER
 #include <linux/freezer.h>
 #endif
 
@@ -100,6 +126,12 @@
 #define YPROC_ROOT  NULL
 #endif
 
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26))
+#define Y_INIT_TIMER(a)	init_timer(a)
+#else
+#define Y_INIT_TIMER(a)	init_timer_on_stack(a)
+#endif
+
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 #define WRITE_SIZE_STR "writesize"
 #define WRITE_SIZE(mtd) ((mtd)->writesize)
@@ -142,6 +174,7 @@ unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
 unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
 unsigned int yaffs_auto_checkpoint = 1;
 unsigned int yaffs_gc_control = 1;
+unsigned int yaffs_bg_enable = 1;
 
 /* Module Parameters */
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
@@ -149,6 +182,7 @@ module_param(yaffs_traceMask, uint, 0644);
 module_param(yaffs_wr_attempts, uint, 0644);
 module_param(yaffs_auto_checkpoint, uint, 0644);
 module_param(yaffs_gc_control, uint, 0644);
+module_param(yaffs_bg_enable, uint, 0644);
 #else
 MODULE_PARM(yaffs_traceMask, "i");
 MODULE_PARM(yaffs_wr_attempts, "i");
@@ -188,7 +222,7 @@ static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
 #define update_dir_time(dir) do {\
 			(dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
 		} while(0)
-		
+
 static void yaffs_put_super(struct super_block *sb);
 
 static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
@@ -258,8 +292,12 @@ static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
 static void yaffs_put_inode(struct inode *inode);
 #endif
 
+#ifdef YAFFS_HAS_EVICT_INODE
+static void yaffs_evict_inode(struct inode *);
+#else
 static void yaffs_delete_inode(struct inode *);
 static void yaffs_clear_inode(struct inode *);
+#endif
 
 static int yaffs_readpage(struct file *file, struct page *page);
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
@@ -268,6 +306,15 @@ static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
 static int yaffs_writepage(struct page *page);
 #endif
 
+#ifdef CONFIG_YAFFS_XATTR
+int yaffs_setxattr(struct dentry *dentry, const char *name,
+			const void *value, size_t size, int flags);
+ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
+			size_t size);
+int yaffs_removexattr(struct dentry *dentry, const char *name);
+ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size);
+#endif
+
 
 #if (YAFFS_USE_WRITE_BEGIN_END != 0)
 static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
@@ -286,13 +333,20 @@ static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
 
 static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
 				int buflen);
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias);
 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 void yaffs_MarkSuperBlockDirty(yaffs_Device *dev);
+
 static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin);
 
+static int yaffs_vfs_setattr(struct inode *, struct iattr *);
+
+
 static struct address_space_operations yaffs_file_address_operations = {
 	.readpage = yaffs_readpage,
 	.writepage = yaffs_writepage,
@@ -305,6 +359,7 @@ static struct address_space_operations yaffs_file_address_operations = {
 #endif
 };
 
+
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
 static const struct file_operations yaffs_file_operations = {
 	.read = do_sync_read,
@@ -359,12 +414,27 @@ static void zero_user_segment(struct page *page, unsigned start, unsigned end)
 
 static const struct inode_operations yaffs_file_inode_operations = {
 	.setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+	.setxattr = yaffs_setxattr,
+	.getxattr = yaffs_getxattr,
+	.listxattr = yaffs_listxattr,
+	.removexattr = yaffs_removexattr,
+#endif
 };
 
 static const struct inode_operations yaffs_symlink_inode_operations = {
 	.readlink = yaffs_readlink,
 	.follow_link = yaffs_follow_link,
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+	.put_link = yaffs_put_link,
+#endif
 	.setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+	.setxattr = yaffs_setxattr,
+	.getxattr = yaffs_getxattr,
+	.listxattr = yaffs_listxattr,
+	.removexattr = yaffs_removexattr,
+#endif
 };
 
 static const struct inode_operations yaffs_dir_inode_operations = {
@@ -378,6 +448,12 @@ static const struct inode_operations yaffs_dir_inode_operations = {
 	.mknod = yaffs_mknod,
 	.rename = yaffs_rename,
 	.setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+	.setxattr = yaffs_setxattr,
+	.getxattr = yaffs_getxattr,
+	.listxattr = yaffs_listxattr,
+	.removexattr = yaffs_removexattr,
+#endif
 };
 
 static const struct file_operations yaffs_dir_operations = {
@@ -397,28 +473,56 @@ static const struct super_operations yaffs_super_ops = {
 	.put_inode = yaffs_put_inode,
 #endif
 	.put_super = yaffs_put_super,
+#ifdef YAFFS_HAS_EVICT_INODE
+	.evict_inode = yaffs_evict_inode,
+#else
 	.delete_inode = yaffs_delete_inode,
 	.clear_inode = yaffs_clear_inode,
+#endif
 	.sync_fs = yaffs_sync_fs,
 	.write_super = yaffs_write_super,
 };
 
+
+static  int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
+{
+#ifdef  YAFFS_USE_SETATTR_COPY
+	setattr_copy(inode,attr);
+	return 0;
+#else
+	return inode_setattr(inode, attr);
+#endif
+
+}
+
+static  int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
+{
+#ifdef  YAFFS_USE_TRUNCATE_SETSIZE
+	truncate_setsize(inode,newsize);
+	return 0;
+#else
+	truncate_inode_pages(&inode->i_data,newsize);
+	return 0;
+#endif
+
+}
+
 static unsigned yaffs_gc_control_callback(yaffs_Device *dev)
 {
 	return yaffs_gc_control;
 }
-                	                                                                                          	
+
 static void yaffs_GrossLock(yaffs_Device *dev)
 {
 	T(YAFFS_TRACE_LOCK, (TSTR("yaffs locking %p\n"), current));
-	down(&(yaffs_DeviceToContext(dev)->grossLock));
+	down(&(yaffs_DeviceToLC(dev)->grossLock));
 	T(YAFFS_TRACE_LOCK, (TSTR("yaffs locked %p\n"), current));
 }
 
 static void yaffs_GrossUnlock(yaffs_Device *dev)
 {
 	T(YAFFS_TRACE_LOCK, (TSTR("yaffs unlocking %p\n"), current));
-	up(&(yaffs_DeviceToContext(dev)->grossLock));
+	up(&(yaffs_DeviceToLC(dev)->grossLock));
 }
 
 #ifdef YAFFS_COMPILE_EXPORTFS
@@ -533,7 +637,7 @@ static struct yaffs_SearchContext * yaffs_NewSearch(yaffs_Object *dir)
                                 dir->variant.directoryVariant.children.next,
 				yaffs_Object,siblings);
 		YINIT_LIST_HEAD(&sc->others);
-		ylist_add(&sc->others,&(yaffs_DeviceToContext(dev)->searchContexts));
+		ylist_add(&sc->others,&(yaffs_DeviceToLC(dev)->searchContexts));
 	}
 	return sc;
 }
@@ -582,7 +686,7 @@ static void yaffs_RemoveObjectCallback(yaffs_Object *obj)
 
         struct ylist_head *i;
         struct yaffs_SearchContext *sc;
-        struct ylist_head *search_contexts = &(yaffs_DeviceToContext(obj->myDev)->searchContexts);
+        struct ylist_head *search_contexts = &(yaffs_DeviceToLC(obj->myDev)->searchContexts);
 
 
         /* Iterate through the directory search contexts.
@@ -624,7 +728,7 @@ static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
 	return ret;
 }
 
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
 static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 #else
 static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
@@ -637,7 +741,6 @@ static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 	yaffs_GrossLock(dev);
 
 	alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
-
 	yaffs_GrossUnlock(dev);
 
 	if (!alias) {
@@ -645,16 +748,25 @@ static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
 		goto out;
 	}
 
-	ret = vfs_follow_link(nd, alias);
-	kfree(alias);
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+	nd_set_link(nd, alias);
+	ret = (int)alias;
 out:
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
 	return ERR_PTR(ret);
 #else
+	ret = vfs_follow_link(nd, alias);
+	kfree(alias);
+out:
 	return ret;
 #endif
 }
 
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias) {
+	kfree(alias);
+}
+#endif
+
 struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
 				yaffs_Object *obj);
 
@@ -674,7 +786,7 @@ static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 
 	yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
 
-	if(current != yaffs_DeviceToContext(dev)->readdirProcess)
+	if(current != yaffs_DeviceToLC(dev)->readdirProcess)
 		yaffs_GrossLock(dev);
 
 	T(YAFFS_TRACE_OS,
@@ -687,7 +799,7 @@ static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
 	obj = yaffs_GetEquivalentObject(obj);	/* in case it was a hardlink */
 
 	/* Can't hold gross lock when calling yaffs_get_inode() */
-	if(current != yaffs_DeviceToContext(dev)->readdirProcess)
+	if(current != yaffs_DeviceToLC(dev)->readdirProcess)
 		yaffs_GrossUnlock(dev);
 
 	if (obj) {
@@ -737,36 +849,85 @@ static void yaffs_put_inode(struct inode *inode)
 }
 #endif
 
-/* clear is called to tell the fs to release any per-inode data it holds */
-static void yaffs_clear_inode(struct inode *inode)
+
+static void yaffs_UnstitchObject(struct inode *inode, yaffs_Object *obj)
+{
+	/* 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);
+}
+
+#ifdef YAFFS_HAS_EVICT_INODE
+/* yaffs_evict_inode combines into one operation what was previously done in
+ * yaffs_clear_inode() and yaffs_delete_inode()
+ *
+ */
+static void yaffs_evict_inode( struct inode *inode)
 {
 	yaffs_Object *obj;
 	yaffs_Device *dev;
+	int deleteme = 0;
 
 	obj = yaffs_InodeToObject(inode);
 
 	T(YAFFS_TRACE_OS,
-		(TSTR("yaffs_clear_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
+		(TSTR("yaffs_evict_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
 		atomic_read(&inode->i_count),
 		obj ? "object exists" : "null object"));
 
+	if (!inode->i_nlink && !is_bad_inode(inode))
+		deleteme = 1;
+	truncate_inode_pages(&inode->i_data,0);
+	end_writeback(inode);
+
+	if(deleteme && obj){
+		dev = obj->myDev;
+		yaffs_GrossLock(dev);
+		yaffs_DeleteObject(obj);
+		yaffs_GrossUnlock(dev);
+	}
 	if (obj) {
 		dev = obj->myDev;
 		yaffs_GrossLock(dev);
+		yaffs_UnstitchObject(inode,obj);
+		yaffs_GrossUnlock(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.
-		 */
+}
+#else
 
-		yaffs_HandleDeferedFree(obj);
+/* clear is called to tell the fs to release any per-inode data it holds.
+ * The object might still exist on disk and is just being thrown out of the cache
+ * or else the object has actually been deleted and we're being called via
+ * the chain
+ *   yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode()
+ */
 
+static void yaffs_clear_inode(struct inode *inode)
+{
+	yaffs_Object *obj;
+	yaffs_Device *dev;
+
+	obj = yaffs_InodeToObject(inode);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("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);
+		yaffs_UnstitchObject(inode,obj);
 		yaffs_GrossUnlock(dev);
 	}
 
@@ -798,6 +959,8 @@ static void yaffs_delete_inode(struct inode *inode)
 #endif
 	clear_inode(inode);
 }
+#endif
+
 
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 static int yaffs_file_flush(struct file *file, fl_owner_t id)
@@ -902,6 +1065,7 @@ static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
 static int yaffs_writepage(struct page *page)
 #endif
 {
+	yaffs_Device *dev;
 	struct address_space *mapping = page->mapping;
 	struct inode *inode;
 	unsigned long end_index;
@@ -949,7 +1113,8 @@ static int yaffs_writepage(struct page *page)
 	buffer = kmap(page);
 
 	obj = yaffs_InodeToObject(inode);
-	yaffs_GrossLock(obj->myDev);
+	dev = obj->myDev;
+	yaffs_GrossLock(dev);
 
 	T(YAFFS_TRACE_OS,
 		(TSTR("yaffs_writepage at %08x, size %08x\n"),
@@ -961,11 +1126,13 @@ static int yaffs_writepage(struct page *page)
 	nWritten = yaffs_WriteDataToFile(obj, buffer,
 			page->index << PAGE_CACHE_SHIFT, nBytes, 0);
 
+	yaffs_MarkSuperBlockDirty(dev);
+
 	T(YAFFS_TRACE_OS,
 		(TSTR("writepag1: obj = %05x, ino = %05x\n"),
 		(int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
 
-	yaffs_GrossUnlock(obj->myDev);
+	yaffs_GrossUnlock(dev);
 
 	kunmap(page);
 	set_page_writeback(page);
@@ -1301,6 +1468,8 @@ static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
 
 	nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
 
+	yaffs_MarkSuperBlockDirty(dev);
+
 	T(YAFFS_TRACE_OS,
 		(TSTR("yaffs_file_write: %d(%x) bytes written\n"),
 		(unsigned )n,(unsigned)n));
@@ -1408,14 +1577,14 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 
 	yaffs_GrossLock(dev);
 
-	yaffs_DeviceToContext(dev)->readdirProcess = current;
+	yaffs_DeviceToLC(dev)->readdirProcess = current;
 
 	offset = f->f_pos;
 
         sc = yaffs_NewSearch(obj);
         if(!sc){
                 retVal = -ENOMEM;
-                goto unlock_out;
+                goto out;
         }
 
 	T(YAFFS_TRACE_OS, (TSTR("yaffs_readdir: starting at %d\n"), (int)offset));
@@ -1425,8 +1594,10 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 			(TSTR("yaffs_readdir: entry . ino %d \n"),
 			(int)inode->i_ino));
 		yaffs_GrossUnlock(dev);
-		if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0)
+		if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0){
+			yaffs_GrossLock(dev);
 			goto out;
+		}
 		yaffs_GrossLock(dev);
 		offset++;
 		f->f_pos++;
@@ -1437,8 +1608,10 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 			(int)f->f_dentry->d_parent->d_inode->i_ino));
 		yaffs_GrossUnlock(dev);
 		if (filldir(dirent, "..", 2, offset,
-			f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
+			f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0){
+			yaffs_GrossLock(dev);
 			goto out;
+		}
 		yaffs_GrossLock(dev);
 		offset++;
 		f->f_pos++;
@@ -1474,8 +1647,10 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
 					strlen(name),
 					offset,
 					this_inode,
-					this_type) < 0)
+					this_type) < 0){
+				yaffs_GrossLock(dev);
 				goto out;
+			}
 
                         yaffs_GrossLock(dev);
 
@@ -1485,12 +1660,10 @@ static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
                 yaffs_SearchAdvance(sc);
 	}
 
-unlock_out:
-	yaffs_DeviceToContext(dev)->readdirProcess = NULL;
-
-	yaffs_GrossUnlock(dev);
 out:
-        yaffs_EndSearch(sc);
+	yaffs_EndSearch(sc);
+	yaffs_DeviceToLC(dev)->readdirProcess = NULL;
+	yaffs_GrossUnlock(dev);
 
 	return retVal;
 }
@@ -1790,7 +1963,7 @@ static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
 			new_dentry->d_inode->i_nlink--;
 			mark_inode_dirty(new_dentry->d_inode);
 		}
-		
+
 		update_dir_time(old_dir);
 		if(old_dir != new_dir)
 			update_dir_time(new_dir);
@@ -1810,7 +1983,7 @@ static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
 		(TSTR("yaffs_setattr of object %d\n"),
 		yaffs_InodeToObject(inode)->objectId));
 
-	/* Fail if a requested resize >= 2GB */		
+	/* Fail if a requested resize >= 2GB */
 	if (attr->ia_valid & ATTR_SIZE &&
 		(attr->ia_size >> 31))
 		error = -EINVAL;
@@ -1820,10 +1993,12 @@ static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
 	if (error == 0) {
 		int result;
 		if (!error){
-			error = inode_setattr(inode, attr);
+			error = yaffs_vfs_setattr(inode, attr);
 			T(YAFFS_TRACE_OS,(TSTR("inode_setattr called\n")));
-			if (attr->ia_valid & ATTR_SIZE)
-                        	truncate_inode_pages(&inode->i_data,attr->ia_size);
+			if (attr->ia_valid & ATTR_SIZE){
+                        	yaffs_vfs_setsize(inode,attr->ia_size);
+                        	inode->i_blocks = (inode->i_size + 511) >> 9;
+			}
 		}
 		dev = yaffs_InodeToObject(inode)->myDev;
 		if (attr->ia_valid & ATTR_SIZE){
@@ -1847,6 +2022,122 @@ static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
 	return error;
 }
 
+#ifdef CONFIG_YAFFS_XATTR
+int yaffs_setxattr(struct dentry *dentry, const char *name,
+			const void *value, size_t size, int flags)
+{
+	struct inode *inode = dentry->d_inode;
+	int error = 0;
+	yaffs_Device *dev;
+	yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_setxattr of object %d\n"),
+		obj->objectId));
+
+
+	if (error == 0) {
+		int result;
+		dev = obj->myDev;
+		yaffs_GrossLock(dev);
+		result = yaffs_SetXAttribute(obj, name, value, size, flags);
+		if(result == YAFFS_OK)
+			error = 0;
+		else if(result < 0)
+			error = result;
+		yaffs_GrossUnlock(dev);
+
+	}
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_setxattr done returning %d\n"),error));
+
+	return error;
+}
+
+
+ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
+			size_t size)
+{
+	struct inode *inode = dentry->d_inode;
+	int error = 0;
+	yaffs_Device *dev;
+	yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_getxattr \"%s\" from object %d\n"),
+		name, obj->objectId));
+
+	if (error == 0) {
+		dev = obj->myDev;
+		yaffs_GrossLock(dev);
+		error = yaffs_GetXAttribute(obj, name, buff, size);
+		yaffs_GrossUnlock(dev);
+
+	}
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_getxattr done returning %d\n"),error));
+
+	return error;
+}
+
+int yaffs_removexattr(struct dentry *dentry, const char *name)
+{
+	struct inode *inode = dentry->d_inode;
+	int error = 0;
+	yaffs_Device *dev;
+	yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_removexattr of object %d\n"),
+		obj->objectId));
+
+
+	if (error == 0) {
+		int result;
+		dev = obj->myDev;
+		yaffs_GrossLock(dev);
+		result = yaffs_RemoveXAttribute(obj, name);
+		if(result == YAFFS_OK)
+			error = 0;
+		else if(result < 0)
+			error = result;
+		yaffs_GrossUnlock(dev);
+
+	}
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_removexattr done returning %d\n"),error));
+
+	return error;
+}
+
+ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size)
+{
+	struct inode *inode = dentry->d_inode;
+	int error = 0;
+	yaffs_Device *dev;
+	yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_listxattr of object %d\n"),
+		obj->objectId));
+
+
+	if (error == 0) {
+		dev = obj->myDev;
+		yaffs_GrossLock(dev);
+		error = yaffs_ListXAttributes(obj, buff, size);
+		yaffs_GrossUnlock(dev);
+
+	}
+	T(YAFFS_TRACE_OS,
+		(TSTR("yaffs_listxattr done returning %d\n"),error));
+
+	return error;
+}
+
+#endif
+
+
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
@@ -1923,7 +2214,7 @@ static void yaffs_FlushInodes(struct super_block *sb)
 {
 	struct inode *iptr;
 	yaffs_Object *obj;
-	
+
 	list_for_each_entry(iptr,&sb->s_inodes, i_sb_list){
 		obj = yaffs_InodeToObject(iptr);
 		if(obj){
@@ -1937,10 +2228,10 @@ static void yaffs_FlushInodes(struct super_block *sb)
 
 static void yaffs_FlushSuperBlock(struct super_block *sb, int do_checkpoint)
 {
-	yaffs_Device *dev = yaffs_SuperToDevice(sb);	
+	yaffs_Device *dev = yaffs_SuperToDevice(sb);
 	if(!dev)
 		return;
-	
+
 	yaffs_FlushInodes(sb);
 	yaffs_UpdateDirtyDirectories(dev);
 	yaffs_FlushEntireDeviceCache(dev);
@@ -1952,7 +2243,7 @@ static void yaffs_FlushSuperBlock(struct super_block *sb, int do_checkpoint)
 static unsigned yaffs_bg_gc_urgency(yaffs_Device *dev)
 {
 	unsigned erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
-	struct yaffs_LinuxContext *context = yaffs_DeviceToContext(dev);
+	struct yaffs_LinuxContext *context = yaffs_DeviceToLC(dev);
 	unsigned scatteredFree = 0; /* Free chunks not in an erased block */
 
 	if(erasedChunks < dev->nFreeChunks)
@@ -2008,7 +2299,7 @@ static int yaffs_do_sync_fs(struct super_block *sb,
  * yaffs_BackgroundStart() launches the background thread.
  * yaffs_BackgroundStop() cleans up the background thread.
  *
- * NB: 
+ * NB:
  * The thread should only run after the yaffs is initialised
  * The thread should be stopped before yaffs is unmounted.
  * The thread should not do any writing while the fs is in read only.
@@ -2024,7 +2315,7 @@ void yaffs_background_waker(unsigned long data)
 static int yaffs_BackgroundThread(void *data)
 {
 	yaffs_Device *dev = (yaffs_Device *)data;
-	struct yaffs_LinuxContext *context = yaffs_DeviceToContext(dev);
+	struct yaffs_LinuxContext *context = yaffs_DeviceToLC(dev);
 	unsigned long now = jiffies;
 	unsigned long next_dir_update = now;
 	unsigned long next_gc = now;
@@ -2038,8 +2329,9 @@ static int yaffs_BackgroundThread(void *data)
 		(TSTR("yaffs_background starting for dev %p\n"),
 		(void *)dev));
 
+#ifdef YAFFS_COMPILE_FREEZER
 	set_freezable();
-
+#endif
 	while(context->bgRunning){
 		T(YAFFS_TRACE_BACKGROUND,
 			(TSTR("yaffs_background\n")));
@@ -2047,19 +2339,20 @@ static int yaffs_BackgroundThread(void *data)
 		if(kthread_should_stop())
 			break;
 
+#ifdef YAFFS_COMPILE_FREEZER
 		if(try_to_freeze())
 			continue;
-
+#endif
 		yaffs_GrossLock(dev);
 
 		now = jiffies;
 
-		if(time_after(now, next_dir_update)){
+		if(time_after(now, next_dir_update) && yaffs_bg_enable){
 			yaffs_UpdateDirtyDirectories(dev);
 			next_dir_update = now + HZ;
 		}
 
-		if(time_after(now,next_gc)){
+		if(time_after(now,next_gc) && yaffs_bg_enable){
 			if(!dev->isCheckpointed){
 				urgency = yaffs_bg_gc_urgency(dev);
 				gcResult = yaffs_BackgroundGarbageCollect(dev, urgency);
@@ -2083,7 +2376,7 @@ static int yaffs_BackgroundThread(void *data)
 		if(time_before(expires,now))
 			expires = now + HZ;
 
-		init_timer_on_stack(&timer);
+		Y_INIT_TIMER(&timer);
 		timer.expires = expires+1;
 		timer.data = (unsigned long) current;
 		timer.function = yaffs_background_waker;
@@ -2103,12 +2396,15 @@ static int yaffs_BackgroundThread(void *data)
 static int yaffs_BackgroundStart(yaffs_Device *dev)
 {
 	int retval = 0;
-	struct yaffs_LinuxContext *context = yaffs_DeviceToContext(dev);
+	struct yaffs_LinuxContext *context = yaffs_DeviceToLC(dev);
+
+	if(dev->readOnly)
+		return -1;
 
 	context->bgRunning = 1;
 
 	context->bgThread = kthread_run(yaffs_BackgroundThread,
-	                        (void *)dev,"yaffs-bg");
+	                        (void *)dev,"yaffs-bg-%d",context->mount_id);
 
 	if(IS_ERR(context->bgThread)){
 		retval = PTR_ERR(context->bgThread);
@@ -2120,7 +2416,7 @@ static int yaffs_BackgroundStart(yaffs_Device *dev)
 
 static void yaffs_BackgroundStop(yaffs_Device *dev)
 {
-	struct yaffs_LinuxContext *ctxt = yaffs_DeviceToContext(dev);
+	struct yaffs_LinuxContext *ctxt = yaffs_DeviceToLC(dev);
 
 	ctxt->bgRunning = 0;
 
@@ -2232,14 +2528,14 @@ static void yaffs_read_inode(struct inode *inode)
 	T(YAFFS_TRACE_OS,
 		(TSTR("yaffs_read_inode for %d\n"), (int)inode->i_ino));
 
-	if(current != yaffs_DeviceToContext(dev)->readdirProcess)
+	if(current != yaffs_DeviceToLC(dev)->readdirProcess)
 		yaffs_GrossLock(dev);
 
 	obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
 
 	yaffs_FillInodeFromObject(inode, obj);
 
-	if(current != yaffs_DeviceToContext(dev)->readdirProcess)
+	if(current != yaffs_DeviceToLC(dev)->readdirProcess)
 		yaffs_GrossUnlock(dev);
 }
 
@@ -2248,34 +2544,6 @@ static void yaffs_read_inode(struct inode *inode)
 static YLIST_HEAD(yaffs_context_list);
 struct semaphore yaffs_context_lock;
 
-#if 0 /* not used */
-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,
-			(TSTR("yaffs_remount_fs: %s: RO\n"), dev->name));
-
-		yaffs_GrossLock(dev);
-
-		yaffs_FlushSuperBlock(sb,1);
-
-		if (mtd->sync)
-			mtd->sync(mtd);
-
-		yaffs_GrossUnlock(dev);
-	} else {
-		T(YAFFS_TRACE_OS,
-			(TSTR("yaffs_remount_fs: %s: RW\n"), dev->name));
-	}
-
-	return 0;
-}
-#endif
-
 static void yaffs_put_super(struct super_block *sb)
 {
 	yaffs_Device *dev = yaffs_SuperToDevice(sb);
@@ -2292,8 +2560,8 @@ static void yaffs_put_super(struct super_block *sb)
 
 	yaffs_FlushSuperBlock(sb,1);
 
-	if (yaffs_DeviceToContext(dev)->putSuperFunc)
-		yaffs_DeviceToContext(dev)->putSuperFunc(sb);
+	if (yaffs_DeviceToLC(dev)->putSuperFunc)
+		yaffs_DeviceToLC(dev)->putSuperFunc(sb);
 
 
 	yaffs_Deinitialise(dev);
@@ -2301,12 +2569,12 @@ static void yaffs_put_super(struct super_block *sb)
 	yaffs_GrossUnlock(dev);
 
 	down(&yaffs_context_lock);
-	ylist_del_init(&(yaffs_DeviceToContext(dev)->contextList));
+	ylist_del_init(&(yaffs_DeviceToLC(dev)->contextList));
 	up(&yaffs_context_lock);
 
-	if (yaffs_DeviceToContext(dev)->spareBuffer) {
-		YFREE(yaffs_DeviceToContext(dev)->spareBuffer);
-		yaffs_DeviceToContext(dev)->spareBuffer = NULL;
+	if (yaffs_DeviceToLC(dev)->spareBuffer) {
+		YFREE(yaffs_DeviceToLC(dev)->spareBuffer);
+		yaffs_DeviceToLC(dev)->spareBuffer = NULL;
 	}
 
 	kfree(dev);
@@ -2315,7 +2583,7 @@ static void yaffs_put_super(struct super_block *sb)
 
 static void yaffs_MTDPutSuper(struct super_block *sb)
 {
-	struct mtd_info *mtd = yaffs_DeviceToContext(yaffs_SuperToDevice(sb))->mtd;
+	struct mtd_info *mtd = yaffs_DeviceToMtd(yaffs_SuperToDevice(sb));
 
 	if (mtd->sync)
 		mtd->sync(mtd);
@@ -2326,7 +2594,7 @@ static void yaffs_MTDPutSuper(struct super_block *sb)
 
 static void yaffs_MarkSuperBlockDirty(yaffs_Device *dev)
 {
-	struct super_block *sb = yaffs_DeviceToContext(dev)->superBlock;
+	struct super_block *sb = yaffs_DeviceToLC(dev)->superBlock;
 
 	T(YAFFS_TRACE_OS, (TSTR("yaffs_MarkSuperBlockDirty() sb = %p\n"), sb));
 	if (sb)
@@ -2424,12 +2692,22 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	struct yaffs_LinuxContext *context = NULL;
 	yaffs_DeviceParam *param;
 
+	int readOnly = 0;
+
 	yaffs_options options;
 
+	unsigned mount_id;
+	int found;
+	struct yaffs_LinuxContext *context_iterator;
+	struct ylist_head *l;
+
 	sb->s_magic = YAFFS_MAGIC;
 	sb->s_op = &yaffs_super_ops;
 	sb->s_flags |= MS_NOATIME;
 
+	readOnly =((sb->s_flags & MS_RDONLY) != 0);
+
+
 #ifdef YAFFS_COMPILE_EXPORTFS
 	sb->s_export_op = &yaffs_export_ops;
 #endif
@@ -2441,9 +2719,10 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	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",
+		printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
 		       sb->s_dev,
-		       yaffs_devname(sb, devname_buf));
+		       yaffs_devname(sb, devname_buf),
+		       readOnly ? "ro" : "rw");
 
 	if (!data_str)
 		data_str = "";
@@ -2583,9 +2862,15 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	 * Set the yaffs_Device up for mtd
 	 */
 
+	if (!readOnly && !(mtd->flags & MTD_WRITEABLE)){
+		readOnly = 1;
+		printk(KERN_INFO "yaffs: mtd is read only, setting superblock read only");
+		sb->s_flags |= MS_RDONLY;
+	}
+
 	dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
 	context = kmalloc(sizeof(struct yaffs_LinuxContext),GFP_KERNEL);
-	
+
 	if(!dev || !context ){
 		if(dev)
 			kfree(dev);
@@ -2606,20 +2891,20 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	param = &(dev->param);
 
 	memset(context,0,sizeof(struct yaffs_LinuxContext));
-	dev->context = context;
+	dev->osContext = context;
 	YINIT_LIST_HEAD(&(context->contextList));
 	context->dev = dev;
 	context->superBlock = sb;
 
-	
+	dev->readOnly = readOnly;
 
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 	sb->s_fs_info = dev;
 #else
 	sb->u.generic_sbp = dev;
 #endif
-	
-	yaffs_DeviceToContext(dev)->mtd = mtd;
+
+	dev->driverContext = mtd;
 	param->name = mtd->name;
 
 	/* Set up the memory size parameters.... */
@@ -2637,6 +2922,9 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
 	param->disableLazyLoad = 1;
 #endif
+#ifdef CONFIG_YAFFS_XATTR
+	param->enableXattr = 1;
+#endif
 	if(options.lazy_loading_overridden)
 		param->disableLazyLoad = !options.lazy_loading_enabled;
 
@@ -2662,6 +2950,10 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	param->refreshPeriod = 500;
 #endif
 
+#ifdef CONFIG_YAFFS__ALWAYS_CHECK_CHUNK_ERASED
+	param->alwaysCheckErased = 1;
+#endif
+
 	if(options.empty_lost_and_found_overridden)
 		param->emptyLostAndFound = options.empty_lost_and_found;
 
@@ -2673,7 +2965,7 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 		    nandmtd2_ReadChunkWithTagsFromNAND;
 		param->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
 		param->queryNANDBlock = nandmtd2_QueryNANDBlock;
-		yaffs_DeviceToContext(dev)->spareBuffer = YMALLOC(mtd->oobsize);
+		yaffs_DeviceToLC(dev)->spareBuffer = YMALLOC(mtd->oobsize);
 		param->isYaffs2 = 1;
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
 		param->totalBytesPerChunk = mtd->writesize;
@@ -2705,13 +2997,13 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	param->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
 	param->initialiseNAND = nandmtd_InitialiseNAND;
 
-	yaffs_DeviceToContext(dev)->putSuperFunc = yaffs_MTDPutSuper;
+	yaffs_DeviceToLC(dev)->putSuperFunc = yaffs_MTDPutSuper;
 
 	param->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
 	param->gcControl = yaffs_gc_control_callback;
 
-	yaffs_DeviceToContext(dev)->superBlock= sb;
-	
+	yaffs_DeviceToLC(dev)->superBlock= sb;
+
 
 #ifndef CONFIG_YAFFS_DOES_ECC
 	param->useNANDECC = 1;
@@ -2724,16 +3016,27 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	param->skipCheckpointRead = options.skip_checkpoint_read;
 	param->skipCheckpointWrite = options.skip_checkpoint_write;
 
-	/* we assume this is protected by lock_kernel() in mount/umount */
 	down(&yaffs_context_lock);
-	ylist_add_tail(&(yaffs_DeviceToContext(dev)->contextList), &yaffs_context_list);
+	/* Get a mount id */
+	found = 0;
+	for(mount_id=0; ! found; mount_id++){
+		found = 1;
+		ylist_for_each(l,&yaffs_context_list){
+			context_iterator = ylist_entry(l,struct yaffs_LinuxContext,contextList);
+			if(context_iterator->mount_id == mount_id)
+				found = 0;
+		}
+	}
+	context->mount_id = mount_id;
+
+	ylist_add_tail(&(yaffs_DeviceToLC(dev)->contextList), &yaffs_context_list);
 	up(&yaffs_context_lock);
 
         /* Directory search handling...*/
-        YINIT_LIST_HEAD(&(yaffs_DeviceToContext(dev)->searchContexts));
+        YINIT_LIST_HEAD(&(yaffs_DeviceToLC(dev)->searchContexts));
         param->removeObjectCallback = yaffs_RemoveObjectCallback;
 
-	init_MUTEX(&(yaffs_DeviceToContext(dev)->grossLock));
+	init_MUTEX(&(yaffs_DeviceToLC(dev)->grossLock));
 
 	yaffs_GrossLock(dev);
 
@@ -2742,10 +3045,10 @@ static struct super_block *yaffs_internal_read_super(int yaffsVersion,
 	T(YAFFS_TRACE_OS,
 	  (TSTR("yaffs_read_super: guts initialised %s\n"),
 	   (err == YAFFS_OK) ? "OK" : "FAILED"));
-	   
+
 	if(err == YAFFS_OK)
 		yaffs_BackgroundStart(dev);
-		
+
 	if(!context->bgThread)
 		param->deferDirectoryUpdate = 0;
 
@@ -2896,6 +3199,7 @@ static char *yaffs_dump_dev_part0(char *buf, yaffs_Device * dev)
 	buf += sprintf(buf, "refreshPeriod...... %d\n", dev->param.refreshPeriod);
 	buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->param.nShortOpCaches);
 	buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->param.nReservedBlocks);
+	buf += sprintf(buf, "alwaysCheckErased.. %d\n", dev->param.alwaysCheckErased);
 
 	buf += sprintf(buf, "\n");
 
@@ -2911,10 +3215,8 @@ static char *yaffs_dump_dev_part1(char *buf, yaffs_Device * dev)
 	buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
 	buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
 	buf += sprintf(buf, "\n");
-	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, "nTnodes............ %d\n", dev->nTnodes);
+	buf += sprintf(buf, "nObjects........... %d\n", dev->nObjects);
 	buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
 	buf += sprintf(buf, "\n");
 	buf += sprintf(buf, "nPageWrites........ %u\n", dev->nPageWrites);
@@ -2924,6 +3226,7 @@ static char *yaffs_dump_dev_part1(char *buf, yaffs_Device * dev)
 	buf += sprintf(buf, "allGCs............. %u\n", dev->allGCs);
 	buf += sprintf(buf, "passiveGCs......... %u\n", dev->passiveGCs);
 	buf += sprintf(buf, "oldestDirtyGCs..... %u\n", dev->oldestDirtyGCs);
+	buf += sprintf(buf, "nGCBlocks.......... %u\n", dev->nGCBlocks);
 	buf += sprintf(buf, "backgroundGCs...... %u\n", dev->backgroundGCs);
 	buf += sprintf(buf, "nRetriedWrites..... %u\n", dev->nRetriedWrites);
 	buf += sprintf(buf, "nRetireBlocks...... %u\n", dev->nRetiredBlocks);
@@ -2960,12 +3263,12 @@ static int yaffs_proc_read(char *page,
 
 	/* Print header first */
 	if (step == 0)
-		buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__"\n");
+		buf += sprintf(buf, "Multi-version YAFFS built:" __DATE__ " " __TIME__"\n");
 	else if (step == 1)
 		buf += sprintf(buf,"\n");
 	else {
 		step-=2;
-		
+
 		down(&yaffs_context_lock);
 
 		/* Locate and print the Nth entry.  Order N-squared but N is small. */
@@ -2982,7 +3285,7 @@ static int yaffs_proc_read(char *page,
 				buf = yaffs_dump_dev_part0(buf, dev);
 			} else
 				buf = yaffs_dump_dev_part1(buf, dev);
-			
+
 			break;
 		}
 		up(&yaffs_context_lock);
@@ -3007,18 +3310,13 @@ static int yaffs_stats_proc_read(char *page,
 		yaffs_Device *dev = dc->dev;
 
 		int erasedChunks;
-		int nObjects;
-		int nTnodes;
 
 		erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
-		nObjects = dev->nObjectsCreated -dev->nFreeObjects;
-		nTnodes = dev->nTnodesCreated - dev->nFreeTnodes;
-		
-		
-		buf += sprintf(buf,"%d, %d, %d, %u, %u, %d, %d\n",
+
+		buf += sprintf(buf,"%d, %d, %d, %u, %u, %u, %u\n",
 				n, dev->nFreeChunks, erasedChunks,
 				dev->backgroundGCs, dev->oldestDirtyGCs,
-				nObjects, nTnodes);
+				dev->nObjects, dev->nTnodes);
 	}
 	up(&yaffs_context_lock);
 
diff --git a/fs/yaffs2/yaffs_yaffs1.c b/fs/yaffs2/yaffs_yaffs1.c
new file mode 100644
index 000000000000..642fd5a4d54e
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs1.c
@@ -0,0 +1,466 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_yaffs1.h"
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+
+
+int yaffs1_Scan(yaffs_Device *dev)
+{
+	yaffs_ExtendedTags tags;
+	int blk;
+	int blockIterator;
+	int startIterator;
+	int endIterator;
+	int result;
+
+	int chunk;
+	int c;
+	int deleted;
+	yaffs_BlockState state;
+	yaffs_Object *hardList = NULL;
+	yaffs_BlockInfo *bi;
+	__u32 sequenceNumber;
+	yaffs_ObjectHeader *oh;
+	yaffs_Object *in;
+	yaffs_Object *parent;
+
+	int alloc_failed = 0;
+
+	struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
+
+
+	__u8 *chunkData;
+
+
+
+	T(YAFFS_TRACE_SCAN,
+	  (TSTR("yaffs1_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
+	   dev->internalStartBlock, dev->internalEndBlock));
+
+	chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+
+	dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+	/* Scan all the blocks to determine their state */
+	bi = dev->blockInfo;
+	for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; 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_BAD_BLOCK)
+			bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
+
+		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->param.nChunksPerBlock;
+		}
+		bi++;
+	}
+
+	startIterator = dev->internalStartBlock;
+	endIterator = dev->internalEndBlock;
+
+	/* For each block.... */
+	for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
+	     blockIterator++) {
+
+		YYIELD();
+
+		YYIELD();
+
+		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->param.nChunksPerBlock &&
+		     state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
+			/* Read the tags and decide what to do */
+			chunk = blk * dev->param.nChunksPerBlock + c;
+
+			result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
+							&tags);
+
+			/* Let's have a good look at this chunk... */
+
+			if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || 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 block finder here to encourage the allocator to go forth from here. */
+
+				}
+
+				dev->nFreeChunks += (dev->param.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->param.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_DeleteObject(in);
+
+					in = 0;
+				}
+
+				in = yaffs_FindOrCreateObjectByNumber(dev,
+								      tags.
+								      objectId,
+								      oh->type);
+
+				if (!in)
+					alloc_failed = 1;
+
+				if (in && oh->shadowsObject > 0) {
+
+					struct yaffs_ShadowFixerStruct *fixer;
+					fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
+					if (fixer) {
+						fixer->next = shadowFixerList;
+						shadowFixerList = fixer;
+						fixer->objectId = tags.objectId;
+						fixer->shadowedId = oh->shadowsObject;
+						T(YAFFS_TRACE_SCAN,
+						  (TSTR
+						   (" Shadow fixer: %d shadows %d" TENDSTR),
+						   fixer->objectId, fixer->shadowedId));
+
+					}
+
+				}
+
+				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 (((existingSerial + 1) & 3) == newSerial) {
+						/* Use new one - destroy the exisiting one */
+						yaffs_DeleteChunk(dev,
+								  in->hdrChunk,
+								  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->hdrChunk = chunk;
+					in->serial = tags.serialNumber;
+
+				} 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->hdrChunk = chunk;
+					in->serial = tags.serialNumber;
+
+					yaffs_SetObjectNameFromOH(in, oh);
+					in->dirty = 0;
+
+					/* directory stuff...
+					 * hook up to parent
+					 */
+
+					parent =
+					    yaffs_FindOrCreateObjectByNumber
+					    (dev, oh->parentObjectId,
+					     YAFFS_OBJECT_TYPE_DIRECTORY);
+					if (!parent)
+						alloc_failed = 1;
+					if (parent && parent->variantType ==
+					    YAFFS_OBJECT_TYPE_UNKNOWN) {
+						/* Set up as a directory */
+						parent->variantType =
+							YAFFS_OBJECT_TYPE_DIRECTORY;
+						YINIT_LIST_HEAD(&parent->variant.
+								directoryVariant.
+								children);
+					} else if (!parent || 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->param.useHeaderFileSize)
+
+							in->variant.fileVariant.
+							    fileSize =
+							    oh->fileSize;
+
+						break;
+					case YAFFS_OBJECT_TYPE_HARDLINK:
+						in->variant.hardLinkVariant.
+							equivalentObjectId =
+							oh->equivalentObjectId;
+						in->hardLinks.next =
+							(struct ylist_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 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+			/* If we got this far while scanning, then the block is fully allocated.*/
+			state = YAFFS_BLOCK_STATE_FULL;
+		}
+
+		if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
+			/* If the block was partially allocated then treat it as fully allocated.*/
+			state = YAFFS_BLOCK_STATE_FULL;
+			dev->allocationBlock = -1;
+		}
+
+		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);
+		}
+
+	}
+
+
+	/* 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);
+
+	/* Fix up any shadowed objects */
+	{
+		struct yaffs_ShadowFixerStruct *fixer;
+		yaffs_Object *obj;
+
+		while (shadowFixerList) {
+			fixer = shadowFixerList;
+			shadowFixerList = fixer->next;
+			/* Complete the rename transaction by deleting the shadowed object
+			 * then setting the object header to unshadowed.
+			 */
+			obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
+			if (obj)
+				yaffs_DeleteObject(obj);
+
+			obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
+
+			if (obj)
+				yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0, NULL);
+
+			YFREE(fixer);
+		}
+	}
+
+	yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+
+	if (alloc_failed)
+		return YAFFS_FAIL;
+
+	T(YAFFS_TRACE_SCAN, (TSTR("yaffs1_Scan ends" TENDSTR)));
+
+
+	return YAFFS_OK;
+}
+
diff --git a/fs/yaffs2/yaffs_yaffs1.h b/fs/yaffs2/yaffs_yaffs1.h
new file mode 100644
index 000000000000..9769eed35ebd
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs1.h
@@ -0,0 +1,22 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_YAFFS1_H__
+#define __YAFFS_YAFFS1_H__
+
+#include "yaffs_guts.h"
+int yaffs1_Scan(yaffs_Device *dev);
+
+#endif
diff --git a/fs/yaffs2/yaffs_yaffs2.c b/fs/yaffs2/yaffs_yaffs2.c
new file mode 100644
index 000000000000..29b8fd078acb
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs2.c
@@ -0,0 +1,1540 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_checkptrw.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_qsort.h"
+#include "yaffs_nand.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_verify.h"
+
+/*
+ * Checkpoints are really no benefit on very small partitions.
+ *
+ * To save space on small partitions don't bother with checkpoints unless
+ * the partition is at least this big.
+ */
+#define YAFFS_CHECKPOINT_MIN_BLOCKS 60
+
+#define YAFFS_SMALL_HOLE_THRESHOLD 4
+
+
+/*
+ * Oldest Dirty Sequence Number handling.
+ */
+
+/* yaffs2_CalcOldestDirtySequence()
+ * yaffs2_FindOldestDirtySequence()
+ * Calculate the oldest dirty sequence number if we don't know it.
+ */
+void yaffs2_CalcOldestDirtySequence(yaffs_Device *dev)
+{
+	int i;
+	unsigned seq;
+	unsigned blockNo = 0;
+	yaffs_BlockInfo *b;
+
+	if(!dev->param.isYaffs2)
+		return;
+
+	/* Find the oldest dirty sequence number. */
+	seq = dev->sequenceNumber + 1;
+	b = dev->blockInfo;
+	for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
+		if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
+			(b->pagesInUse - b->softDeletions) < dev->param.nChunksPerBlock &&
+			b->sequenceNumber < seq) {
+			seq = b->sequenceNumber;
+			blockNo = i;
+		}
+		b++;
+	}
+
+	if(blockNo){
+		dev->oldestDirtySequence = seq;
+		dev->oldestDirtyBlock = blockNo;
+	}
+
+}
+
+
+void yaffs2_FindOldestDirtySequence(yaffs_Device *dev)
+{
+	if(!dev->param.isYaffs2)
+		return;
+
+	if(!dev->oldestDirtySequence)
+		yaffs2_CalcOldestDirtySequence(dev);
+}
+
+/*
+ * yaffs_ClearOldestDirtySequence()
+ * Called when a block is erased or marked bad. (ie. when its sequenceNumber
+ * becomes invalid). If the value matches the oldest then we clear
+ * dev->oldestDirtySequence to force its recomputation.
+ */
+void yaffs2_ClearOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi)
+{
+
+	if(!dev->param.isYaffs2)
+		return;
+
+	if(!bi || bi->sequenceNumber == dev->oldestDirtySequence){
+		dev->oldestDirtySequence = 0;
+		dev->oldestDirtyBlock = 0;
+	}
+}
+
+/*
+ * yaffs2_UpdateOldestDirtySequence()
+ * Update the oldest dirty sequence number whenever we dirty a block.
+ * Only do this if the oldestDirtySequence is actually being tracked.
+ */
+void yaffs2_UpdateOldestDirtySequence(yaffs_Device *dev, unsigned blockNo, yaffs_BlockInfo *bi)
+{
+	if(!dev->param.isYaffs2)
+		return;
+
+	if(dev->oldestDirtySequence){
+		if(dev->oldestDirtySequence > bi->sequenceNumber){
+			dev->oldestDirtySequence = bi->sequenceNumber;
+			dev->oldestDirtyBlock = blockNo;
+		}
+	}
+}
+
+int yaffs2_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
+					yaffs_BlockInfo *bi)
+{
+
+	if (!dev->param.isYaffs2)
+		return 1;	/* disqualification only applies to yaffs2. */
+
+	if (!bi->hasShrinkHeader)
+		return 1;	/* can gc */
+
+	yaffs2_FindOldestDirtySequence(dev);
+
+	/* 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);
+}
+
+/*
+ * yaffs2_FindRefreshBlock()
+ * periodically finds the oldest full block by sequence number for refreshing.
+ * Only for yaffs2.
+ */
+__u32 yaffs2_FindRefreshBlock(yaffs_Device *dev)
+{
+	__u32 b ;
+
+	__u32 oldest = 0;
+	__u32 oldestSequence = 0;
+
+	yaffs_BlockInfo *bi;
+
+	if(!dev->param.isYaffs2)
+		return oldest;
+
+	/*
+	 * If refresh period < 10 then refreshing is disabled.
+	 */
+	if(dev->param.refreshPeriod < 10)
+	        return oldest;
+
+        /*
+         * Fix broken values.
+         */
+        if(dev->refreshSkip > dev->param.refreshPeriod)
+                dev->refreshSkip = dev->param.refreshPeriod;
+
+	if(dev->refreshSkip > 0)
+	        return oldest;
+
+	/*
+	 * Refresh skip is now zero.
+	 * We'll do a refresh this time around....
+	 * Update the refresh skip and find the oldest block.
+	 */
+	dev->refreshSkip = dev->param.refreshPeriod;
+	dev->refreshCount++;
+	bi = dev->blockInfo;
+	for (b = dev->internalStartBlock; b <=dev->internalEndBlock; b++){
+
+		if (bi->blockState == YAFFS_BLOCK_STATE_FULL){
+
+			if(oldest < 1 ||
+                                bi->sequenceNumber < oldestSequence){
+                                oldest = b;
+                                oldestSequence = bi->sequenceNumber;
+                        }
+		}
+		bi++;
+	}
+
+	if (oldest > 0) {
+		T(YAFFS_TRACE_GC,
+		  (TSTR("GC refresh count %d selected block %d with sequenceNumber %d" TENDSTR),
+		   dev->refreshCount, oldest, oldestSequence));
+	}
+
+	return oldest;
+}
+
+int yaffs2_CheckpointRequired(yaffs_Device *dev)
+{
+	int nblocks;
+
+	if(!dev->param.isYaffs2)
+		return 0;
+
+	nblocks = dev->internalEndBlock - dev->internalStartBlock + 1 ;
+
+	return 	!dev->param.skipCheckpointWrite &&
+		!dev->readOnly &&
+		(nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS);
+}
+
+int yaffs2_CalcCheckpointBlocksRequired(yaffs_Device *dev)
+{
+	int retval;
+
+	if(!dev->param.isYaffs2)
+		return 0;
+
+	if (!dev->nCheckpointBlocksRequired &&
+		yaffs2_CheckpointRequired(dev)){
+		/* Not a valid value so recalculate */
+		int nBytes = 0;
+		int nBlocks;
+		int devBlocks = (dev->param.endBlock - dev->param.startBlock + 1);
+
+		nBytes += sizeof(yaffs_CheckpointValidity);
+		nBytes += sizeof(yaffs_CheckpointDevice);
+		nBytes += devBlocks * sizeof(yaffs_BlockInfo);
+		nBytes += devBlocks * dev->chunkBitmapStride;
+		nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjects);
+		nBytes += (dev->tnodeSize + sizeof(__u32)) * (dev->nTnodes);
+		nBytes += sizeof(yaffs_CheckpointValidity);
+		nBytes += sizeof(__u32); /* checksum*/
+
+		/* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
+
+		nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->param.nChunksPerBlock)) + 3;
+
+		dev->nCheckpointBlocksRequired = nBlocks;
+	}
+
+	retval = dev->nCheckpointBlocksRequired - dev->blocksInCheckpoint;
+	if(retval < 0)
+		retval = 0;
+	return retval;
+}
+
+/*--------------------- Checkpointing --------------------*/
+
+
+static int yaffs2_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 (yaffs2_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
+		1 : 0;
+}
+
+static int yaffs2_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
+{
+	yaffs_CheckpointValidity cp;
+	int ok;
+
+	ok = (yaffs2_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 yaffs2_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;
+
+}
+
+static void yaffs2_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;
+}
+
+
+static int yaffs2_WriteCheckpointDevice(yaffs_Device *dev)
+{
+	yaffs_CheckpointDevice cp;
+	__u32 nBytes;
+	__u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
+
+	int ok;
+
+	/* Write device runtime values*/
+	yaffs2_DeviceToCheckpointDevice(&cp, dev);
+	cp.structType = sizeof(cp);
+
+	ok = (yaffs2_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+	/* Write block info */
+	if (ok) {
+		nBytes = nBlocks * sizeof(yaffs_BlockInfo);
+		ok = (yaffs2_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
+	}
+
+	/* Write chunk bits */
+	if (ok) {
+		nBytes = nBlocks * dev->chunkBitmapStride;
+		ok = (yaffs2_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
+	}
+	return	 ok ? 1 : 0;
+
+}
+
+static int yaffs2_ReadCheckpointDevice(yaffs_Device *dev)
+{
+	yaffs_CheckpointDevice cp;
+	__u32 nBytes;
+	__u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
+
+	int ok;
+
+	ok = (yaffs2_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
+	if (!ok)
+		return 0;
+
+	if (cp.structType != sizeof(cp))
+		return 0;
+
+
+	yaffs2_CheckpointDeviceToDevice(dev, &cp);
+
+	nBytes = nBlocks * sizeof(yaffs_BlockInfo);
+
+	ok = (yaffs2_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
+
+	if (!ok)
+		return 0;
+	nBytes = nBlocks * dev->chunkBitmapStride;
+
+	ok = (yaffs2_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
+
+	return ok ? 1 : 0;
+}
+
+static void yaffs2_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
+					   yaffs_Object *obj)
+{
+
+	cp->objectId = obj->objectId;
+	cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
+	cp->hdrChunk = obj->hdrChunk;
+	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 int yaffs2_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
+{
+
+	yaffs_Object *parent;
+
+	if (obj->variantType != cp->variantType) {
+		T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
+			TCONT("chunk %d does not match existing object type %d")
+			TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
+			obj->variantType));
+		return 0;
+	}
+
+	obj->objectId = cp->objectId;
+
+	if (cp->parentId)
+		parent = yaffs_FindOrCreateObjectByNumber(
+					obj->myDev,
+					cp->parentId,
+					YAFFS_OBJECT_TYPE_DIRECTORY);
+	else
+		parent = NULL;
+
+	if (parent) {
+		if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+			T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
+				TCONT(" chunk %d Parent type, %d, not directory")
+				TENDSTR),
+				cp->objectId, cp->parentId, cp->variantType,
+				cp->hdrChunk, parent->variantType));
+			return 0;
+		}
+		yaffs_AddObjectToDirectory(parent, obj);
+	}
+
+	obj->hdrChunk = cp->hdrChunk;
+	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->hdrChunk > 0)
+		obj->lazyLoaded = 1;
+	return 1;
+}
+
+
+
+static int yaffs2_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
+					__u32 level, int chunkOffset)
+{
+	int i;
+	yaffs_Device *dev = in->myDev;
+	int ok = 1;
+
+	if (tn) {
+		if (level > 0) {
+
+			for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
+				if (tn->internal[i]) {
+					ok = yaffs2_CheckpointTnodeWorker(in,
+							tn->internal[i],
+							level - 1,
+							(chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
+				}
+			}
+		} else if (level == 0) {
+			__u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
+			ok = (yaffs2_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
+			if (ok)
+				ok = (yaffs2_CheckpointWrite(dev, tn, dev->tnodeSize) == dev->tnodeSize);
+		}
+	}
+
+	return ok;
+
+}
+
+static int yaffs2_WriteCheckpointTnodes(yaffs_Object *obj)
+{
+	__u32 endMarker = ~0;
+	int ok = 1;
+
+	if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
+		ok = yaffs2_CheckpointTnodeWorker(obj,
+					    obj->variant.fileVariant.top,
+					    obj->variant.fileVariant.topLevel,
+					    0);
+		if (ok)
+			ok = (yaffs2_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
+				sizeof(endMarker));
+	}
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_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 = (yaffs2_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
+
+	while (ok && (~baseChunk)) {
+		nread++;
+		/* Read level 0 tnode */
+
+
+		tn = yaffs_GetTnode(dev);
+		if (tn){
+			ok = (yaffs2_CheckpointRead(dev, tn, dev->tnodeSize) == dev->tnodeSize);
+		} else
+			ok = 0;
+
+		if (tn && ok)
+			ok = yaffs_AddOrFindLevel0Tnode(dev,
+							fileStructPtr,
+							baseChunk,
+							tn) ? 1 : 0;
+
+		if (ok)
+			ok = (yaffs2_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 yaffs2_WriteCheckpointObjects(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	yaffs_CheckpointObject cp;
+	int i;
+	int ok = 1;
+	struct ylist_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++) {
+		ylist_for_each(lh, &dev->objectBucket[i].list) {
+			if (lh) {
+				obj = ylist_entry(lh, yaffs_Object, hashLink);
+				if (!obj->deferedFree) {
+					yaffs2_ObjectToCheckpointObject(&cp, obj);
+					cp.structType = sizeof(cp);
+
+					T(YAFFS_TRACE_CHECKPOINT, (
+						TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %p" TENDSTR),
+						cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, obj));
+
+					ok = (yaffs2_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+					if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
+						ok = yaffs2_WriteCheckpointTnodes(obj);
+				}
+			}
+		}
+	}
+
+	/* Dump end of list */
+	memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
+	cp.structType = sizeof(cp);
+
+	if (ok)
+		ok = (yaffs2_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_ReadCheckpointObjects(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	yaffs_CheckpointObject cp;
+	int ok = 1;
+	int done = 0;
+	yaffs_Object *hardList = NULL;
+
+	while (ok && !done) {
+		ok = (yaffs2_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, (int)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.hdrChunk));
+
+		if (ok && cp.objectId == ~0)
+			done = 1;
+		else if (ok) {
+			obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
+			if (obj) {
+				ok = yaffs2_CheckpointObjectToObject(obj, &cp);
+				if (!ok)
+					break;
+				if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
+					ok = yaffs2_ReadCheckpointTnodes(obj);
+				} else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
+					obj->hardLinks.next =
+						(struct ylist_head *) hardList;
+					hardList = obj;
+				}
+			} else
+				ok = 0;
+		}
+	}
+
+	if (ok)
+		yaffs_HardlinkFixup(dev, hardList);
+
+	return ok ? 1 : 0;
+}
+
+static int yaffs2_WriteCheckpointSum(yaffs_Device *dev)
+{
+	__u32 checkpointSum;
+	int ok;
+
+	yaffs2_GetCheckpointSum(dev, &checkpointSum);
+
+	ok = (yaffs2_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
+
+	if (!ok)
+		return 0;
+
+	return 1;
+}
+
+static int yaffs2_ReadCheckpointSum(yaffs_Device *dev)
+{
+	__u32 checkpointSum0;
+	__u32 checkpointSum1;
+	int ok;
+
+	yaffs2_GetCheckpointSum(dev, &checkpointSum0);
+
+	ok = (yaffs2_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
+
+	if (!ok)
+		return 0;
+
+	if (checkpointSum0 != checkpointSum1)
+		return 0;
+
+	return 1;
+}
+
+
+static int yaffs2_WriteCheckpointData(yaffs_Device *dev)
+{
+	int ok = 1;
+
+	if (!yaffs2_CheckpointRequired(dev)) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
+		ok = 0;
+	}
+
+	if (ok)
+		ok = yaffs2_CheckpointOpen(dev, 1);
+
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
+		ok = yaffs2_WriteCheckpointValidityMarker(dev, 1);
+	}
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
+		ok = yaffs2_WriteCheckpointDevice(dev);
+	}
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
+		ok = yaffs2_WriteCheckpointObjects(dev);
+	}
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
+		ok = yaffs2_WriteCheckpointValidityMarker(dev, 0);
+	}
+
+	if (ok)
+		ok = yaffs2_WriteCheckpointSum(dev);
+
+	if (!yaffs2_CheckpointClose(dev))
+		ok = 0;
+
+	if (ok)
+		dev->isCheckpointed = 1;
+	else
+		dev->isCheckpointed = 0;
+
+	return dev->isCheckpointed;
+}
+
+static int yaffs2_ReadCheckpointData(yaffs_Device *dev)
+{
+	int ok = 1;
+
+	if(!dev->param.isYaffs2)
+		ok = 0;
+
+	if (ok && dev->param.skipCheckpointRead) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
+		ok = 0;
+	}
+
+	if (ok)
+		ok = yaffs2_CheckpointOpen(dev, 0); /* open for read */
+
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
+		ok = yaffs2_ReadCheckpointValidityMarker(dev, 1);
+	}
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
+		ok = yaffs2_ReadCheckpointDevice(dev);
+	}
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
+		ok = yaffs2_ReadCheckpointObjects(dev);
+	}
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
+		ok = yaffs2_ReadCheckpointValidityMarker(dev, 0);
+	}
+
+	if (ok) {
+		ok = yaffs2_ReadCheckpointSum(dev);
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
+	}
+
+	if (!yaffs2_CheckpointClose(dev))
+		ok = 0;
+
+	if (ok)
+		dev->isCheckpointed = 1;
+	else
+		dev->isCheckpointed = 0;
+
+	return ok ? 1 : 0;
+
+}
+
+void yaffs2_InvalidateCheckpoint(yaffs_Device *dev)
+{
+	if (dev->isCheckpointed ||
+			dev->blocksInCheckpoint > 0) {
+		dev->isCheckpointed = 0;
+		yaffs2_CheckpointInvalidateStream(dev);
+	}
+	if (dev->param.markSuperBlockDirty)
+		dev->param.markSuperBlockDirty(dev);
+}
+
+
+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) {
+		yaffs2_InvalidateCheckpoint(dev);
+		yaffs2_WriteCheckpointData(dev);
+	}
+
+	T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+
+	return dev->isCheckpointed;
+}
+
+int yaffs2_CheckpointRestore(yaffs_Device *dev)
+{
+	int retval;
+	T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+
+	retval = yaffs2_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;
+}
+
+int yaffs2_HandleHole(yaffs_Object *obj, loff_t newSize)
+{
+	/* if newsSize > oldFileSize.
+	 * We're going to be writing a hole.
+	 * If the hole is small then write zeros otherwise write a start of hole marker.
+	 */
+
+
+	loff_t oldFileSize;
+	int increase;
+	int smallHole   ;
+	int result = YAFFS_OK;
+	yaffs_Device *dev = NULL;
+
+	__u8 *localBuffer = NULL;
+
+	int smallIncreaseOk = 0;
+
+	if(!obj)
+		return YAFFS_FAIL;
+
+	if(obj->variantType != YAFFS_OBJECT_TYPE_FILE)
+		return YAFFS_FAIL;
+
+	dev = obj->myDev;
+
+	/* Bail out if not yaffs2 mode */
+	if(!dev->param.isYaffs2)
+		return YAFFS_OK;
+
+	oldFileSize = obj->variant.fileVariant.fileSize;
+
+	if (newSize <= oldFileSize)
+		return YAFFS_OK;
+
+	increase = newSize - oldFileSize;
+
+	if(increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->nDataBytesPerChunk &&
+		yaffs_CheckSpaceForAllocation(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
+		smallHole = 1;
+	else
+		smallHole = 0;
+
+	if(smallHole)
+		localBuffer= yaffs_GetTempBuffer(dev, __LINE__);
+
+	if(localBuffer){
+		/* fill hole with zero bytes */
+		int pos = oldFileSize;
+		int thisWrite;
+		int written;
+		memset(localBuffer,0,dev->nDataBytesPerChunk);
+		smallIncreaseOk = 1;
+
+		while(increase > 0 && smallIncreaseOk){
+			thisWrite = increase;
+			if(thisWrite > dev->nDataBytesPerChunk)
+				thisWrite = dev->nDataBytesPerChunk;
+			written = yaffs_DoWriteDataToFile(obj,localBuffer,pos,thisWrite,0);
+			if(written == thisWrite){
+				pos += thisWrite;
+				increase -= thisWrite;
+			} else
+				smallIncreaseOk = 0;
+		}
+
+		yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
+
+		/* If we were out of space then reverse any chunks we've added */
+		if(!smallIncreaseOk)
+			yaffs_ResizeDown(obj, oldFileSize);
+	}
+
+	if (!smallIncreaseOk &&
+		obj->parent &&
+		obj->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
+		obj->parent->objectId != YAFFS_OBJECTID_DELETED){
+		/* Write a hole start header with the old file size */
+		yaffs_UpdateObjectHeader(obj, NULL, 0, 1, 0, NULL);
+	}
+
+	return result;
+
+}
+
+
+typedef struct {
+	int seq;
+	int block;
+} yaffs_BlockIndex;
+
+
+static int yaffs2_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;
+}
+
+int yaffs2_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;
+	__u32 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;
+
+	T(YAFFS_TRACE_SCAN,
+	  (TSTR
+	   ("yaffs2_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("yaffs2_ScanBackwards() 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 */
+	bi = dev->blockInfo;
+	for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; 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;
+		if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
+			bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
+
+		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->param.nChunksPerBlock;
+		} else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+
+			/* Determine the highest sequence number */
+			if (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 {
+				/* TODO: Nasty sequence number! */
+				T(YAFFS_TRACE_SCAN,
+				  (TSTR
+				   ("Block scanning block %d has bad sequence number %d"
+				    TENDSTR), blk, sequenceNumber));
+
+			}
+		}
+		bi++;
+	}
+
+	T(YAFFS_TRACE_SCAN,
+	(TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
+
+
+
+	YYIELD();
+
+	/* Sort the blocks by sequence number*/
+	yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), yaffs2_ybicmp);
+
+	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->param.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->param.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.
+							 */
+
+							 T(YAFFS_TRACE_SCAN,
+							 (TSTR("Partially written block %d detected" TENDSTR),
+							 blk));
+						}
+					}
+				}
+
+				dev->nFreeChunks++;
+
+			} else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
+				T(YAFFS_TRACE_SCAN,
+				  (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
+				  blk, c));
+
+				  dev->nFreeChunks++;
+
+			} else if (tags.objectId > YAFFS_MAX_OBJECT_ID ||
+				tags.chunkId > YAFFS_MAX_CHUNK_ID ||
+				(tags.chunkId > 0 && tags.byteCount > dev->nDataBytesPerChunk) ||
+				tags.sequenceNumber != bi->sequenceNumber ) {
+				T(YAFFS_TRACE_SCAN,
+				  (TSTR("Chunk (%d:%d) with bad tags:obj = %d, chunkId = %d, byteCount = %d, ignored"TENDSTR),
+				  blk, c,tags.objectId, tags.chunkId, tags.byteCount));
+
+				  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 = chunkBase + 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 = endpos;
+					}
+
+				} else if (in) {
+					/* This chunk has been invalidated by a resize, or a past file deletion
+					 * so delete the chunk*/
+					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)
+						alloc_failed = 1;
+				}
+
+				if (!in ||
+				    (!in->valid && dev->param.disableLazyLoad) ||
+				    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 (dev->param.inbandTags) {
+						/* Fix up the header if they got corrupted by inband tags */
+						oh->shadowsObject = oh->inbandShadowsObject;
+						oh->isShrink = oh->inbandIsShrink;
+					}
+
+					if (!in) {
+						in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
+						if (!in)
+							alloc_failed = 1;
+					}
+
+				}
+
+				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));
+					continue;
+				}
+
+				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;
+
+
+						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 && in->variantType !=
+				    (oh ? oh->type : tags.extraObjectType))
+					T(YAFFS_TRACE_ERROR, (
+						TSTR("yaffs tragedy: Bad object type, "
+					    TCONT("%d != %d, for object %d at chunk ")
+					    TCONT("%d during scan")
+						TENDSTR), oh ?
+					    oh->type : tags.extraObjectType,
+					    in->variantType, tags.objectId,
+					    chunk));
+
+				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->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;
+
+						in->lazyLoaded = 0;
+
+#endif
+					} else
+						in->lazyLoaded = 1;
+
+					in->hdrChunk = chunk;
+
+				} else if (!in->valid) {
+					/* we need to load this info */
+
+					in->valid = 1;
+					in->hdrChunk = 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_SetObjectNameFromOH(in, oh);
+						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;
+
+					if (!parent)
+						alloc_failed = 1;
+
+					/* directory stuff...
+					 * hook up to parent
+					 */
+
+					if (parent && parent->variantType ==
+					    YAFFS_OBJECT_TYPE_UNKNOWN) {
+						/* Set up as a directory */
+						parent->variantType =
+							YAFFS_OBJECT_TYPE_DIRECTORY;
+						YINIT_LIST_HEAD(&parent->variant.
+							directoryVariant.
+							children);
+					} else if (!parent || 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 = fileSize;
+						}
+
+						if (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 ylist_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);
+		}
+
+	}
+
+	yaffs_SkipRestOfBlock(dev);
+
+	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);
+
+
+	yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+
+	if (alloc_failed)
+		return YAFFS_FAIL;
+
+	T(YAFFS_TRACE_SCAN, (TSTR("yaffs2_ScanBackwards ends" TENDSTR)));
+
+	return YAFFS_OK;
+}
diff --git a/fs/yaffs2/yaffs_yaffs2.h b/fs/yaffs2/yaffs_yaffs2.h
new file mode 100644
index 000000000000..08ba36300cb0
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs2.h
@@ -0,0 +1,38 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_YAFFS2_H__
+#define __YAFFS_YAFFS2_H__
+
+#include "yaffs_guts.h"
+
+void yaffs2_CalcOldestDirtySequence(yaffs_Device *dev);
+void yaffs2_FindOldestDirtySequence(yaffs_Device *dev);
+void yaffs2_ClearOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi);
+void yaffs2_UpdateOldestDirtySequence(yaffs_Device *dev, unsigned blockNo, yaffs_BlockInfo *bi);
+int yaffs2_BlockNotDisqualifiedFromGC(yaffs_Device *dev, yaffs_BlockInfo *bi);
+__u32 yaffs2_FindRefreshBlock(yaffs_Device *dev);
+int yaffs2_CheckpointRequired(yaffs_Device *dev);
+int yaffs2_CalcCheckpointBlocksRequired(yaffs_Device *dev);
+
+
+void yaffs2_InvalidateCheckpoint(yaffs_Device *dev);
+int yaffs2_CheckpointSave(yaffs_Device *dev);
+int yaffs2_CheckpointRestore(yaffs_Device *dev);
+
+int yaffs2_HandleHole(yaffs_Object *obj, loff_t newSize);
+int yaffs2_ScanBackwards(yaffs_Device *dev);
+
+#endif
diff --git a/fs/yaffs2/yportenv.h b/fs/yaffs2/yportenv.h
index 13cc1eb62178..3dc677d17faf 100644
--- a/fs/yaffs2/yportenv.h
+++ b/fs/yaffs2/yportenv.h
@@ -41,12 +41,14 @@
 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
 #include <linux/config.h>
 #endif
+
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/sched.h>
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
+#include <linux/xattr.h>
 
 #define YCHAR char
 #define YUCHAR unsigned char
@@ -59,7 +61,7 @@
 #define yaffs_sprintf	       sprintf
 #define yaffs_toupper(a)       toupper(a)
 
-#define Y_INLINE inline
+#define Y_INLINE __inline__
 
 #define YAFFS_LOSTNFOUND_NAME		"lost+found"
 #define YAFFS_LOSTNFOUND_PREFIX		"obj"
@@ -111,7 +113,6 @@
 #include "stdio.h"
 #include "string.h"
 
-#include "devextras.h"
 
 #define YMALLOC(x) malloc(x)
 #define YFREE(x)   free(x)
@@ -153,6 +154,168 @@
 
 #endif
 
+#if defined(CONFIG_YAFFS_DIRECT) || defined(CONFIG_YAFFS_WINCE)
+
+#ifdef CONFIG_YAFFSFS_PROVIDE_VALUES
+
+#ifndef O_RDONLY
+#define O_RDONLY        00
+#endif
+
+#ifndef O_WRONLY
+#define O_WRONLY	01
+#endif
+
+#ifndef O_RDWR
+#define O_RDWR		02
+#endif
+
+#ifndef O_CREAT
+#define O_CREAT 	0100
+#endif
+
+#ifndef O_EXCL
+#define O_EXCL		0200
+#endif
+
+#ifndef O_TRUNC
+#define O_TRUNC		01000
+#endif
+
+#ifndef O_APPEND
+#define O_APPEND	02000
+#endif
+
+#ifndef SEEK_SET
+#define SEEK_SET	0
+#endif
+
+#ifndef SEEK_CUR
+#define SEEK_CUR	1
+#endif
+
+#ifndef SEEK_END
+#define SEEK_END	2
+#endif
+
+#ifndef EBUSY
+#define EBUSY	16
+#endif
+
+#ifndef ENODEV
+#define ENODEV	19
+#endif
+
+#ifndef EINVAL
+#define EINVAL	22
+#endif
+
+#ifndef EBADF
+#define EBADF	9
+#endif
+
+#ifndef EACCES
+#define EACCES	13
+#endif
+
+#ifndef EXDEV
+#define EXDEV	18
+#endif
+
+#ifndef ENOENT
+#define ENOENT	2
+#endif
+
+#ifndef ENOSPC
+#define ENOSPC	28
+#endif
+
+#ifndef ERANGE
+#define ERANGE 34
+#endif
+
+#ifndef ENODATA
+#define ENODATA 61
+#endif
+
+#ifndef ENOTEMPTY
+#define ENOTEMPTY 39
+#endif
+
+#ifndef ENAMETOOLONG
+#define ENAMETOOLONG 36
+#endif
+
+#ifndef ENOMEM
+#define ENOMEM 12
+#endif
+
+#ifndef EEXIST
+#define EEXIST 17
+#endif
+
+#ifndef ENOTDIR
+#define ENOTDIR 20
+#endif
+
+#ifndef EISDIR
+#define EISDIR 21
+#endif
+
+
+// Mode flags
+
+#ifndef S_IFMT
+#define S_IFMT		0170000
+#endif
+
+#ifndef S_IFLNK
+#define S_IFLNK		0120000
+#endif
+
+#ifndef S_IFDIR
+#define S_IFDIR		0040000
+#endif
+
+#ifndef S_IFREG
+#define S_IFREG		0100000
+#endif
+
+#ifndef S_IREAD
+#define S_IREAD		0000400
+#endif
+
+#ifndef S_IWRITE
+#define	S_IWRITE	0000200
+#endif
+
+#ifndef S_IEXEC
+#define	S_IEXEC	0000100
+#endif
+
+#ifndef XATTR_CREATE
+#define XATTR_CREATE 1
+#endif
+
+#ifndef XATTR_REPLACE
+#define XATTR_REPLACE 2
+#endif
+
+#ifndef R_OK
+#define R_OK	4
+#define W_OK	2
+#define X_OK	1
+#define F_OK	0
+#endif
+
+#else
+#include <errno.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#endif
+
+#endif
+
 #ifndef Y_DUMP_STACK
 #define Y_DUMP_STACK() do { } while (0)
 #endif
@@ -166,4 +329,5 @@
 } while (0)
 #endif
 
+
 #endif