--- linux-2.6.27.6/fs/yaffs2/yaffs_guts.c	1970-01-01 08:00:00.000000000 +0800
+++ linux-2.6.27.6.yaffs/fs/yaffs2/yaffs_guts.c	2011-05-08 18:01:08.000000000 +0800
@@ -0,0 +1,8113 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+const char *yaffs_guts_c_version =
+    "$Id: yaffs_guts.c,v 1.120 2010/03/15 23:10:34 charles Exp $";
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+
+#include "yaffsinterface.h"
+#include "yaffs_guts.h"
+#include "yaffs_tagsvalidity.h"
+#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_nand.h"
+#include "yaffs_packedtags2.h"
+
+
+#define YAFFS_PASSIVE_GC_CHUNKS 2
+#define YAFFS_SMALL_HOLE_THRESHOLD 3
+
+#include "yaffs_ecc.h"
+
+
+/* Robustification (if it ever comes about...) */
+static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND);
+static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
+		int erasedOk);
+static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
+				const __u8 *data,
+				const yaffs_ExtendedTags *tags);
+static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
+				const yaffs_ExtendedTags *tags);
+
+/* Other local prototypes */
+static 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 void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
+static int yaffs_CheckStructures(void);
+static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
+			int chunkOffset, int *limit);
+static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
+
+static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev, int blockNo);
+
+
+static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
+				int chunkInNAND);
+
+static int yaffs_UnlinkWorker(yaffs_Object *obj);
+
+static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
+			int chunkInObject);
+
+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);
+
+/* Function to calculate chunk and offset */
+
+static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut,
+		__u32 *offsetOut)
+{
+	int chunk;
+	__u32 offset;
+
+	chunk  = (__u32)(addr >> dev->chunkShift);
+
+	if (dev->chunkDiv == 1) {
+		/* easy power of 2 case */
+		offset = (__u32)(addr & dev->chunkMask);
+	} else {
+		/* Non power-of-2 case */
+
+		loff_t chunkBase;
+
+		chunk /= dev->chunkDiv;
+
+		chunkBase = ((loff_t)chunk) * dev->nDataBytesPerChunk;
+		offset = (__u32)(addr - chunkBase);
+	}
+
+	*chunkOut = chunk;
+	*offsetOut = offset;
+}
+
+/* Function to return the number of shifts for a power of 2 greater than or
+ * equal to the given number
+ * Note we don't try to cater for all possible numbers and this does not have to
+ * be hellishly efficient.
+ */
+
+static __u32 ShiftsGE(__u32 x)
+{
+	int extraBits;
+	int nShifts;
+
+	nShifts = extraBits = 0;
+
+	while (x > 1) {
+		if (x & 1)
+			extraBits++;
+		x >>= 1;
+		nShifts++;
+	}
+
+	if (extraBits)
+		nShifts++;
+
+	return nShifts;
+}
+
+/* Function to return the number of shifts to get a 1 in bit 0
+ */
+
+static __u32 Shifts(__u32 x)
+{
+	int nShifts;
+
+	nShifts =  0;
+
+	if (!x)
+		return 0;
+
+	while (!(x&1)) {
+		x >>= 1;
+		nShifts++;
+	}
+
+	return nShifts;
+}
+
+
+
+/*
+ * Temporary buffer manipulations.
+ */
+
+static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
+{
+	int i;
+	__u8 *buf = (__u8 *)1;
+
+	memset(dev->tempBuffer, 0, sizeof(dev->tempBuffer));
+
+	for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
+		dev->tempBuffer[i].line = 0;	/* not in use */
+		dev->tempBuffer[i].buffer = buf =
+		    YMALLOC_DMA(dev->param.totalBytesPerChunk);
+	}
+
+	return buf ? YAFFS_OK : YAFFS_FAIL;
+}
+
+__u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo)
+{
+	int i, j;
+
+	dev->tempInUse++;
+	if (dev->tempInUse > dev->maxTemp)
+		dev->maxTemp = dev->tempInUse;
+
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+		if (dev->tempBuffer[i].line == 0) {
+			dev->tempBuffer[i].line = lineNo;
+			if ((i + 1) > dev->maxTemp) {
+				dev->maxTemp = i + 1;
+				for (j = 0; j <= i; j++)
+					dev->tempBuffer[j].maxLine =
+					    dev->tempBuffer[j].line;
+			}
+
+			return dev->tempBuffer[i].buffer;
+		}
+	}
+
+	T(YAFFS_TRACE_BUFFERS,
+	  (TSTR("Out of temp buffers at line %d, other held by lines:"),
+	   lineNo));
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+		T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
+
+	T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
+
+	/*
+	 * If we got here then we have to allocate an unmanaged one
+	 * This is not good.
+	 */
+
+	dev->unmanagedTempAllocations++;
+	return YMALLOC(dev->nDataBytesPerChunk);
+
+}
+
+void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer,
+				    int lineNo)
+{
+	int i;
+
+	dev->tempInUse--;
+
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+		if (dev->tempBuffer[i].buffer == buffer) {
+			dev->tempBuffer[i].line = 0;
+			return;
+		}
+	}
+
+	if (buffer) {
+		/* assume it is an unmanaged one. */
+		T(YAFFS_TRACE_BUFFERS,
+		  (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
+		   lineNo));
+		YFREE(buffer);
+		dev->unmanagedTempDeallocations++;
+	}
+
+}
+
+/*
+ * Determine if we have a managed buffer.
+ */
+int yaffs_IsManagedTempBuffer(yaffs_Device *dev, const __u8 *buffer)
+{
+	int i;
+
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+		if (dev->tempBuffer[i].buffer == buffer)
+			return 1;
+	}
+
+	for (i = 0; i < dev->param.nShortOpCaches; i++) {
+		if (dev->srCache[i].data == buffer)
+			return 1;
+	}
+
+	if (buffer == dev->checkpointBuffer)
+		return 1;
+
+	T(YAFFS_TRACE_ALWAYS,
+		(TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
+	return 0;
+}
+
+
+
+/*
+ * Chunk bitmap manipulations
+ */
+
+static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
+{
+	if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
+		T(YAFFS_TRACE_ERROR,
+			(TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
+			blk));
+		YBUG();
+	}
+	return dev->chunkBits +
+		(dev->chunkBitmapStride * (blk - dev->internalStartBlock));
+}
+
+static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
+{
+	if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
+			chunk < 0 || chunk >= dev->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));
+}
+
+
+
+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;
+
+}
+
+
+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);
+			}
+		}
+	}
+}
+
+
+/*
+ *  Simple hash function. Needs to have a reasonable spread
+ */
+
+static Y_INLINE int yaffs_HashFunction(int n)
+{
+	n = abs(n);
+	return n % YAFFS_NOBJECT_BUCKETS;
+}
+
+/*
+ * Access functions to useful fake objects.
+ * Note that root might have a presence in NAND if permissions are set.
+ */
+
+yaffs_Object *yaffs_Root(yaffs_Device *dev)
+{
+	return dev->rootDir;
+}
+
+yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
+{
+	return dev->lostNFoundDir;
+}
+
+
+/*
+ *  Erased NAND checking functions
+ */
+
+int yaffs_CheckFF(__u8 *buffer, int nBytes)
+{
+	/* Horrible, slow implementation */
+	while (nBytes--) {
+		if (*buffer != 0xFF)
+			return 0;
+		buffer++;
+	}
+	return 1;
+}
+
+static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
+				int chunkInNAND)
+{
+	int retval = YAFFS_OK;
+	__u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
+	yaffs_ExtendedTags tags;
+	int result;
+
+	result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
+
+	if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
+		retval = YAFFS_FAIL;
+
+	if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
+		T(YAFFS_TRACE_NANDACCESS,
+		  (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
+		retval = YAFFS_FAIL;
+	}
+
+	yaffs_ReleaseTempBuffer(dev, data, __LINE__);
+
+	return retval;
+
+}
+
+
+static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
+					int chunkInNAND,
+					const __u8 *data,
+					yaffs_ExtendedTags *tags)
+{
+	int retval = YAFFS_OK;
+	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 ||
+		tempTags.chunkId  != tags->chunkId ||
+		tempTags.byteCount != tags->byteCount)
+		retval = YAFFS_FAIL;
+
+	yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
+
+	return retval;
+}
+
+static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
+					const __u8 *data,
+					yaffs_ExtendedTags *tags,
+					int useReserve)
+{
+	int attempts = 0;
+	int writeOk = 0;
+	int chunk;
+
+	yaffs_InvalidateCheckpoint(dev);
+
+	do {
+		yaffs_BlockInfo *bi = 0;
+		int erasedOk = 0;
+
+		chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
+		if (chunk < 0) {
+			/* no space */
+			break;
+		}
+
+		/* First check this chunk is erased, if it needs
+		 * checking.  The checking policy (unless forced
+		 * always on) is as follows:
+		 *
+		 * Check the first page we try to write in a block.
+		 * If the check passes then we don't need to check any
+		 * more.	If the check fails, we check again...
+		 * If the block has been erased, we don't need to check.
+		 *
+		 * However, if the block has been prioritised for gc,
+		 * then we think there might be something odd about
+		 * this block and stop using it.
+		 *
+		 * Rationale: We should only ever see chunks that have
+		 * not been erased if there was a partially written
+		 * chunk due to power loss.  This checking policy should
+		 * catch that case with very few checks and thus save a
+		 * lot of checks that are most likely not needed.
+		 *
+		 * Mods to the above
+		 * If an erase check fails or the write fails we skip the 
+		 * rest of the block.
+		 */
+
+		/* let's give it a try */
+		attempts++;
+
+#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
+		bi->skipErasedCheck = 0;
+#endif
+		if (!bi->skipErasedCheck) {
+			erasedOk = yaffs_CheckChunkErased(dev, chunk);
+			if (erasedOk != YAFFS_OK) {
+				T(YAFFS_TRACE_ERROR,
+				(TSTR("**>> yaffs chunk %d was not erased"
+				TENDSTR), chunk));
+
+				/* If not erased, delete this one,
+				 * skip rest of block and
+				 * try another chunk */
+				 yaffs_DeleteChunk(dev,chunk,1,__LINE__);
+				 yaffs_SkipRestOfBlock(dev);
+				continue;
+			}
+		}
+
+		writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
+				data, tags);
+
+		if(!bi->skipErasedCheck)
+			writeOk = yaffs_VerifyChunkWritten(dev, chunk, data, tags);
+
+		if (writeOk != YAFFS_OK) {
+			/* Clean up aborted write, skip to next block and
+			 * try another chunk */
+			yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
+			continue;
+		}
+
+		bi->skipErasedCheck = 1;
+
+		/* Copy the data into the robustification buffer */
+		yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
+
+	} while (writeOk != YAFFS_OK &&
+		(yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
+
+	if (!writeOk)
+		chunk = -1;
+
+	if (attempts > 1) {
+		T(YAFFS_TRACE_ERROR,
+			(TSTR("**>> yaffs write required %d attempts" TENDSTR),
+			attempts));
+
+		dev->nRetriedWrites += (attempts - 1);
+	}
+
+	return chunk;
+}
+
+
+/*
+ * Oldest Dirty Sequence Number handling.
+ */
+ 
+/* yaffs_CalcOldestDirtySequence()
+ * yaffs_FindOldestDirtySequence()
+ * Calculate the oldest dirty sequence number if we don't know it.
+ */
+static int yaffs_CalcOldestDirtySequence(yaffs_Device *dev)
+{
+	int i;
+	__u32 seq;
+	yaffs_BlockInfo *b;
+
+	if(!dev->param.isYaffs2)
+		return 0;
+
+	/* Find the oldest dirty sequence number. */
+	seq = dev->sequenceNumber;
+	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;
+		b++;
+	}
+	return seq;
+}
+
+
+static void yaffs_FindOldestDirtySequence(yaffs_Device *dev)
+{
+	if(dev->param.isYaffs2 && !dev->oldestDirtySequence)
+		dev->oldestDirtySequence = 
+			yaffs_CalcOldestDirtySequence(dev);
+
+#if 0
+	if(!yaffs_SkipVerification(dev) &&
+		dev->oldestDirtySequence != yaffs_CalcOldestDirtySequence(dev))
+		YBUG();
+
+#endif
+}
+
+/*
+ * 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;
+}
+
+/*
+ * 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, yaffs_BlockInfo *bi)
+{
+	if(dev->param.isYaffs2 && dev->oldestDirtySequence){
+		if(dev->oldestDirtySequence > bi->sequenceNumber)
+			dev->oldestDirtySequence = bi->sequenceNumber;
+	}
+}
+ 
+/*
+ * Block retiring for handling a broken block.
+ */
+
+static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
+{
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
+
+	yaffs_InvalidateCheckpoint(dev);
+	
+	yaffs_ClearOldestDirtySequence(dev,bi);
+
+	if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
+		if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
+			T(YAFFS_TRACE_ALWAYS, (TSTR(
+				"yaffs: Failed to mark bad and erase block %d"
+				TENDSTR), blockInNAND));
+		} else {
+			yaffs_ExtendedTags tags;
+			int chunkId = blockInNAND * dev->param.nChunksPerBlock;
+
+			__u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
+
+			memset(buffer, 0xff, dev->nDataBytesPerChunk);
+			yaffs_InitialiseTags(&tags);
+			tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
+			if (dev->param.writeChunkWithTagsToNAND(dev, chunkId -
+				dev->chunkOffset, buffer, &tags) != YAFFS_OK)
+				T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
+					TCONT("write bad block marker to block %d")
+					TENDSTR), blockInNAND));
+
+			yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
+		}
+	}
+
+	bi->blockState = YAFFS_BLOCK_STATE_DEAD;
+	bi->gcPrioritise = 0;
+	bi->needsRetiring = 0;
+
+	dev->nRetiredBlocks++;
+}
+
+/*
+ * Functions for robustisizing TODO
+ *
+ */
+
+static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
+				const __u8 *data,
+				const yaffs_ExtendedTags *tags)
+{
+	dev=dev;
+	chunkInNAND=chunkInNAND;
+	data=data;
+	tags=tags;
+}
+
+static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
+				const yaffs_ExtendedTags *tags)
+{
+	dev=dev;
+	chunkInNAND=chunkInNAND;
+	tags=tags;
+}
+
+void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
+{
+	if (!bi->gcPrioritise) {
+		bi->gcPrioritise = 1;
+		dev->hasPendingPrioritisedGCs = 1;
+		bi->chunkErrorStrikes++;
+
+		if (bi->chunkErrorStrikes > 3) {
+			bi->needsRetiring = 1; /* Too many stikes, so retire this */
+			T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
+
+		}
+	}
+}
+
+static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
+		int erasedOk)
+{
+	int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock;
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
+
+	yaffs_HandleChunkError(dev, bi);
+
+	if (erasedOk) {
+		/* Was an actual write failure, so mark the block for retirement  */
+		bi->needsRetiring = 1;
+		T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+		  (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
+	}
+
+	/* Delete the chunk */
+	yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
+	yaffs_SkipRestOfBlock(dev);
+}
+
+
+/*---------------- Name handling functions ------------*/
+
+static __u16 yaffs_CalcNameSum(const YCHAR *name)
+{
+	__u16 sum = 0;
+	__u16 i = 1;
+
+	const YUCHAR *bname = (const YUCHAR *) name;
+	if (bname) {
+		while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+			sum += yaffs_toupper(*bname) * i;
+#else
+			sum += (*bname) * i;
+#endif
+			i++;
+			bname++;
+		}
+	}
+	return sum;
+}
+
+static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
+{
+#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
+	memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
+	if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH)
+		yaffs_strcpy(obj->shortName, name);
+	else
+		obj->shortName[0] = _Y('\0');
+#endif
+	obj->sum = yaffs_CalcNameSum(name);
+}
+
+/*-------------------- TNODES -------------------
+
+ * List of spare tnodes
+ * The list is hooked together using the first pointer
+ * in the tnode.
+ */
+
+/* yaffs_CreateTnodes creates a bunch more tnodes and
+ * adds them to the tnode free list.
+ * Don't use this function directly
+ */
+static 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)
+{
+	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;
+	}
+
+	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
+	}
+	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
+}
+
+static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
+{
+	/* Free the list of allocated tnodes */
+	yaffs_TnodeList *tmp;
+
+	while (dev->allocatedTnodeList) {
+		tmp = dev->allocatedTnodeList->next;
+
+		YFREE(dev->allocatedTnodeList->tnodes);
+		YFREE(dev->allocatedTnodeList);
+		dev->allocatedTnodeList = tmp;
+
+	}
+
+	dev->freeTnodes = NULL;
+	dev->nFreeTnodes = 0;
+	dev->nTnodesCreated = 0;
+}
+
+static void yaffs_InitialiseTnodes(yaffs_Device *dev)
+{
+	dev->allocatedTnodeList = NULL;
+	dev->freeTnodes = NULL;
+	dev->nFreeTnodes = 0;
+	dev->nTnodesCreated = 0;
+}
+
+
+void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
+		unsigned val)
+{
+	__u32 *map = (__u32 *)tn;
+	__u32 bitInMap;
+	__u32 bitInWord;
+	__u32 wordInMap;
+	__u32 mask;
+
+	pos &= YAFFS_TNODES_LEVEL0_MASK;
+	val >>= dev->chunkGroupBits;
+
+	bitInMap = pos * dev->tnodeWidth;
+	wordInMap = bitInMap / 32;
+	bitInWord = bitInMap & (32 - 1);
+
+	mask = dev->tnodeMask << bitInWord;
+
+	map[wordInMap] &= ~mask;
+	map[wordInMap] |= (mask & (val << bitInWord));
+
+	if (dev->tnodeWidth > (32 - bitInWord)) {
+		bitInWord = (32 - bitInWord);
+		wordInMap++;;
+		mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
+		map[wordInMap] &= ~mask;
+		map[wordInMap] |= (mask & (val >> bitInWord));
+	}
+}
+
+static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
+		unsigned pos)
+{
+	__u32 *map = (__u32 *)tn;
+	__u32 bitInMap;
+	__u32 bitInWord;
+	__u32 wordInMap;
+	__u32 val;
+
+	pos &= YAFFS_TNODES_LEVEL0_MASK;
+
+	bitInMap = pos * dev->tnodeWidth;
+	wordInMap = bitInMap / 32;
+	bitInWord = bitInMap & (32 - 1);
+
+	val = map[wordInMap] >> bitInWord;
+
+	if	(dev->tnodeWidth > (32 - bitInWord)) {
+		bitInWord = (32 - bitInWord);
+		wordInMap++;;
+		val |= (map[wordInMap] << bitInWord);
+	}
+
+	val &= dev->tnodeMask;
+	val <<= dev->chunkGroupBits;
+
+	return val;
+}
+
+/* ------------------- End of individual tnode manipulation -----------------*/
+
+/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
+ * The look up tree is represented by the top tnode and the number of topLevel
+ * in the tree. 0 means only the level 0 tnode is in the tree.
+ */
+
+/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
+static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
+					yaffs_FileStructure *fStruct,
+					__u32 chunkId)
+{
+	yaffs_Tnode *tn = fStruct->top;
+	__u32 i;
+	int requiredTallness;
+	int level = fStruct->topLevel;
+
+	dev=dev;
+
+	/* Check sane level and chunk Id */
+	if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
+		return NULL;
+
+	if (chunkId > YAFFS_MAX_CHUNK_ID)
+		return NULL;
+
+	/* First check we're tall enough (ie enough topLevel) */
+
+	i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
+	requiredTallness = 0;
+	while (i) {
+		i >>= YAFFS_TNODES_INTERNAL_BITS;
+		requiredTallness++;
+	}
+
+	if (requiredTallness > fStruct->topLevel)
+		return NULL; /* Not tall enough, so we can't find it */
+
+	/* Traverse down to level 0 */
+	while (level > 0 && tn) {
+		tn = tn->internal[(chunkId >>
+			(YAFFS_TNODES_LEVEL0_BITS +
+				(level - 1) *
+				YAFFS_TNODES_INTERNAL_BITS)) &
+			YAFFS_TNODES_INTERNAL_MASK];
+		level--;
+	}
+
+	return tn;
+}
+
+/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
+ * This happens in two steps:
+ *  1. If the tree isn't tall enough, then make it taller.
+ *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
+ *
+ * Used when modifying the tree.
+ *
+ *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
+ *  be plugged into the ttree.
+ */
+
+static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
+					yaffs_FileStructure *fStruct,
+					__u32 chunkId,
+					yaffs_Tnode *passedTn)
+{
+	int requiredTallness;
+	int i;
+	int l;
+	yaffs_Tnode *tn;
+
+	__u32 x;
+
+
+	/* Check sane level and page Id */
+	if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
+		return NULL;
+
+	if (chunkId > YAFFS_MAX_CHUNK_ID)
+		return NULL;
+
+	/* First check we're tall enough (ie enough topLevel) */
+
+	x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
+	requiredTallness = 0;
+	while (x) {
+		x >>= YAFFS_TNODES_INTERNAL_BITS;
+		requiredTallness++;
+	}
+
+
+	if (requiredTallness > fStruct->topLevel) {
+		/* Not tall enough, gotta make the tree taller */
+		for (i = fStruct->topLevel; i < requiredTallness; i++) {
+
+			tn = yaffs_GetTnode(dev);
+
+			if (tn) {
+				tn->internal[0] = fStruct->top;
+				fStruct->top = tn;
+				fStruct->topLevel++;
+			} else {
+				T(YAFFS_TRACE_ERROR,
+					(TSTR("yaffs: no more tnodes" TENDSTR)));
+				return NULL;
+			}
+		}
+	}
+
+	/* Traverse down to level 0, adding anything we need */
+
+	l = fStruct->topLevel;
+	tn = fStruct->top;
+
+	if (l > 0) {
+		while (l > 0 && tn) {
+			x = (chunkId >>
+			     (YAFFS_TNODES_LEVEL0_BITS +
+			      (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
+			    YAFFS_TNODES_INTERNAL_MASK;
+
+
+			if ((l > 1) && !tn->internal[x]) {
+				/* Add missing non-level-zero tnode */
+				tn->internal[x] = yaffs_GetTnode(dev);
+				if(!tn->internal[x])
+					return NULL;
+			} else if (l == 1) {
+				/* Looking from level 1 at level 0 */
+				if (passedTn) {
+					/* If we already have one, then release it.*/
+					if (tn->internal[x])
+						yaffs_FreeTnode(dev, tn->internal[x]);
+					tn->internal[x] = passedTn;
+
+				} else if (!tn->internal[x]) {
+					/* Don't have one, none passed in */
+					tn->internal[x] = yaffs_GetTnode(dev);
+					if(!tn->internal[x])
+						return NULL;
+				}
+			}
+
+			tn = tn->internal[x];
+			l--;
+		}
+	} else {
+		/* top is level 0 */
+		if (passedTn) {
+			memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
+			yaffs_FreeTnode(dev, passedTn);
+		}
+	}
+
+	return tn;
+}
+
+static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
+				yaffs_ExtendedTags *tags, int objectId,
+				int chunkInInode)
+{
+	int j;
+
+	for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
+		if (yaffs_CheckChunkBit(dev, theChunk / dev->param.nChunksPerBlock,
+				theChunk % dev->param.nChunksPerBlock)) {
+			
+			if(dev->chunkGroupSize == 1)
+				return theChunk;
+			else {
+				yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
+								tags);
+				if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
+					/* found it; */
+					return theChunk;
+				}
+			}
+		}
+		theChunk++;
+	}
+	return -1;
+}
+
+
+/* DeleteWorker scans backwards through the tnode tree and deletes all the
+ * chunks and tnodes in the file
+ * Returns 1 if the tree was deleted.
+ * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
+ */
+
+static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
+			      int chunkOffset, int *limit)
+{
+	int i;
+	int chunkInInode;
+	int theChunk;
+	yaffs_ExtendedTags tags;
+	int foundChunk;
+	yaffs_Device *dev = in->myDev;
+
+	int allDone = 1;
+
+	if (tn) {
+		if (level > 0) {
+			for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
+			     i--) {
+				if (tn->internal[i]) {
+					if (limit && (*limit) < 0) {
+						allDone = 0;
+					} else {
+						allDone =
+							yaffs_DeleteWorker(in,
+								tn->
+								internal
+								[i],
+								level -
+								1,
+								(chunkOffset
+									<<
+									YAFFS_TNODES_INTERNAL_BITS)
+								+ i,
+								limit);
+					}
+					if (allDone) {
+						yaffs_FreeTnode(dev,
+								tn->
+								internal[i]);
+						tn->internal[i] = NULL;
+					}
+				}
+			}
+			return (allDone) ? 1 : 0;
+		} else if (level == 0) {
+			int hitLimit = 0;
+
+			for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
+					i--) {
+				theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
+				if (theChunk) {
+
+					chunkInInode = (chunkOffset <<
+						YAFFS_TNODES_LEVEL0_BITS) + i;
+
+					foundChunk =
+						yaffs_FindChunkInGroup(dev,
+								theChunk,
+								&tags,
+								in->objectId,
+								chunkInInode);
+
+					if (foundChunk > 0) {
+						yaffs_DeleteChunk(dev,
+								  foundChunk, 1,
+								  __LINE__);
+						in->nDataChunks--;
+						if (limit) {
+							*limit = *limit - 1;
+							if (*limit <= 0)
+								hitLimit = 1;
+						}
+
+					}
+
+					yaffs_LoadLevel0Tnode(dev, tn, i, 0);
+				}
+
+			}
+			return (i < 0) ? 1 : 0;
+
+		}
+
+	}
+
+	return 1;
+
+}
+
+static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
+{
+	yaffs_BlockInfo *theBlock;
+
+	T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
+
+	theBlock = yaffs_GetBlockInfo(dev, chunk / dev->param.nChunksPerBlock);
+	if (theBlock) {
+		theBlock->softDeletions++;
+		dev->nFreeChunks++;
+		yaffs_UpdateOldestDirtySequence(dev,theBlock);
+	}
+}
+
+/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
+ * All soft deleting does is increment the block's softdelete count and pulls the chunk out
+ * of the tnode.
+ * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
+ */
+
+static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
+				  __u32 level, int chunkOffset)
+{
+	int i;
+	int theChunk;
+	int allDone = 1;
+	yaffs_Device *dev = in->myDev;
+
+	if (tn) {
+		if (level > 0) {
+
+			for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
+			     i--) {
+				if (tn->internal[i]) {
+					allDone =
+					    yaffs_SoftDeleteWorker(in,
+								   tn->
+								   internal[i],
+								   level - 1,
+								   (chunkOffset
+								    <<
+								    YAFFS_TNODES_INTERNAL_BITS)
+								   + i);
+					if (allDone) {
+						yaffs_FreeTnode(dev,
+								tn->
+								internal[i]);
+						tn->internal[i] = NULL;
+					} else {
+						/* Hoosterman... how could this happen? */
+					}
+				}
+			}
+			return (allDone) ? 1 : 0;
+		} else if (level == 0) {
+
+			for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
+				theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
+				if (theChunk) {
+					/* Note this does not find the real chunk, only the chunk group.
+					 * We make an assumption that a chunk group is not larger than
+					 * a block.
+					 */
+					yaffs_SoftDeleteChunk(dev, theChunk);
+					yaffs_LoadLevel0Tnode(dev, tn, i, 0);
+				}
+
+			}
+			return 1;
+
+		}
+
+	}
+
+	return 1;
+
+}
+
+static void yaffs_SoftDeleteFile(yaffs_Object *obj)
+{
+	if (obj->deleted &&
+	    obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
+		if (obj->nDataChunks <= 0) {
+			/* Empty file with no duplicate object headers, just delete it immediately */
+			yaffs_FreeTnode(obj->myDev,
+					obj->variant.fileVariant.top);
+			obj->variant.fileVariant.top = NULL;
+			T(YAFFS_TRACE_TRACING,
+			  (TSTR("yaffs: Deleting empty file %d" TENDSTR),
+			   obj->objectId));
+			yaffs_DoGenericObjectDeletion(obj);
+		} else {
+			yaffs_SoftDeleteWorker(obj,
+					       obj->variant.fileVariant.top,
+					       obj->variant.fileVariant.
+					       topLevel, 0);
+			obj->softDeleted = 1;
+		}
+	}
+}
+
+/* Pruning removes any part of the file structure tree that is beyond the
+ * bounds of the file (ie that does not point to chunks).
+ *
+ * A file should only get pruned when its size is reduced.
+ *
+ * Before pruning, the chunks must be pulled from the tree and the
+ * level 0 tnode entries must be zeroed out.
+ * Could also use this for file deletion, but that's probably better handled
+ * by a special case.
+ *
+ * This function is recursive. For levels > 0 the function is called again on
+ * any sub-tree. For level == 0 we just check if the sub-tree has data.
+ * If there is no data in a subtree then it is pruned.
+ */
+
+static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
+				__u32 level, int del0)
+{
+	int i;
+	int hasData;
+
+	if (tn) {
+		hasData = 0;
+
+		if(level > 0){
+			for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
+				if (tn->internal[i]) {
+					tn->internal[i] =
+						yaffs_PruneWorker(dev, tn->internal[i],
+							level - 1,
+							(i == 0) ? del0 : 1);
+				}
+
+				if (tn->internal[i])
+					hasData++;
+			}
+		} else {
+			int tnodeSize_u32 = yaffs_CalcTnodeSize(dev)/sizeof(__u32);
+			__u32 *map = (__u32 *)tn;
+
+                        for(i = 0; !hasData && i < tnodeSize_u32; i++){
+                                if(map[i])
+                                        hasData++;
+                        }
+                }
+
+		if (hasData == 0 && del0) {
+			/* Free and return NULL */
+
+			yaffs_FreeTnode(dev, tn);
+			tn = NULL;
+		}
+
+	}
+
+	return tn;
+
+}
+
+static int yaffs_PruneFileStructure(yaffs_Device *dev,
+				yaffs_FileStructure *fStruct)
+{
+	int i;
+	int hasData;
+	int done = 0;
+	yaffs_Tnode *tn;
+
+	if (fStruct->topLevel > 0) {
+		fStruct->top =
+		    yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
+
+		/* Now we have a tree with all the non-zero branches NULL but the height
+		 * is the same as it was.
+		 * Let's see if we can trim internal tnodes to shorten the tree.
+		 * We can do this if only the 0th element in the tnode is in use
+		 * (ie all the non-zero are NULL)
+		 */
+
+		while (fStruct->topLevel && !done) {
+			tn = fStruct->top;
+
+			hasData = 0;
+			for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
+				if (tn->internal[i])
+					hasData++;
+			}
+
+			if (!hasData) {
+				fStruct->top = tn->internal[0];
+				fStruct->topLevel--;
+				yaffs_FreeTnode(dev, tn);
+			} else {
+				done = 1;
+			}
+		}
+	}
+
+	return YAFFS_OK;
+}
+
+/*-------------------- End of File Structure functions.-------------------*/
+
+/* yaffs_CreateFreeObjects creates a bunch more objects and
+ * adds them to the object free list.
+ */
+static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
+{
+	int i;
+	yaffs_Object *newObjects;
+	yaffs_ObjectList *list;
+
+	if (nObjects < 1)
+		return YAFFS_OK;
+
+	/* make these things */
+	newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
+	list = YMALLOC(sizeof(yaffs_ObjectList));
+
+	if (!newObjects || !list) {
+		if (newObjects){
+			YFREE(newObjects);
+			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;
+
+#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 (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;
+
+		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);
+
+
+		/* Now make the directory sane */
+		if (dev->rootDir) {
+			tn->parent = dev->rootDir;
+			ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
+		}
+
+		/* Add it to the lost and found directory.
+		 * NB Can't put root or lostNFound in lostNFound so
+		 * check if lostNFound exists first
+		 */
+		if (dev->lostNFoundDir)
+			yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
+
+		tn->beingCreated = 0;
+	}
+
+	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
+
+	return tn;
+}
+
+static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
+					       __u32 mode)
+{
+
+	yaffs_Object *obj =
+	    yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
+	if (obj) {
+		obj->fake = 1;		/* it is fake so it might have no NAND presence... */
+		obj->renameAllowed = 0;	/* ... and we're not allowed to rename it... */
+		obj->unlinkAllowed = 0;	/* ... or unlink it */
+		obj->deleted = 0;
+		obj->unlinked = 0;
+		obj->yst_mode = mode;
+		obj->myDev = dev;
+		obj->hdrChunk = 0;	/* Not a valid chunk. */
+	}
+
+	return obj;
+
+}
+
+static void yaffs_UnhashObject(yaffs_Object *tn)
+{
+	int bucket;
+	yaffs_Device *dev = tn->myDev;
+
+	/* If it is still linked into the bucket list, free from the list */
+	if (!ylist_empty(&tn->hashLink)) {
+		ylist_del_init(&tn->hashLink);
+		bucket = yaffs_HashFunction(tn->objectId);
+		dev->objectBucket[bucket].count--;
+	}
+}
+
+/*  FreeObject frees up a Object and puts it back on the free list */
+static void yaffs_FreeObject(yaffs_Object *tn)
+{
+	yaffs_Device *dev = tn->myDev;
+
+	T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
+
+	if (!tn)
+		YBUG();
+	if (tn->parent)
+		YBUG();
+	if (!ylist_empty(&tn->siblings))
+		YBUG();
+
+
+	if (tn->myInode) {
+		/* We're still hooked up to a cached inode.
+		 * Don't delete now, but mark for later deletion
+		 */
+		tn->deferedFree = 1;
+		return;
+	}
+
+	yaffs_UnhashObject(tn);
+
+#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
+	dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
+}
+
+
+void yaffs_HandleDeferedFree(yaffs_Object *obj)
+{
+	if (obj->deferedFree)
+		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)
+{
+	int i;
+
+	dev->allocatedObjectList = NULL;
+	dev->freeObjects = NULL;
+	dev->nFreeObjects = 0;
+
+	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+		YINIT_LIST_HEAD(&dev->objectBucket[i].list);
+		dev->objectBucket[i].count = 0;
+	}
+}
+
+static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
+{
+	int i;
+	int l = 999;
+	int lowest = 999999;
+
+
+	/* Search for the shortest list or one that
+	 * isn't too long.
+	 */
+
+	for (i = 0; i < 10 && lowest > 4; i++) {
+		dev->bucketFinder++;
+		dev->bucketFinder %= YAFFS_NOBJECT_BUCKETS;
+		if (dev->objectBucket[dev->bucketFinder].count < lowest) {
+			lowest = dev->objectBucket[dev->bucketFinder].count;
+			l = dev->bucketFinder;
+		}
+
+	}
+
+	return l;
+}
+
+static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
+{
+	int bucket = yaffs_FindNiceObjectBucket(dev);
+
+	/* Now find an object value that has not already been taken
+	 * by scanning the list.
+	 */
+
+	int found = 0;
+	struct ylist_head *i;
+
+	__u32 n = (__u32) bucket;
+
+	/* yaffs_CheckObjectHashSanity();  */
+
+	while (!found) {
+		found = 1;
+		n += YAFFS_NOBJECT_BUCKETS;
+		if (1 || dev->objectBucket[bucket].count > 0) {
+			ylist_for_each(i, &dev->objectBucket[bucket].list) {
+				/* If there is already one in the list */
+				if (i && ylist_entry(i, yaffs_Object,
+						hashLink)->objectId == n) {
+					found = 0;
+				}
+			}
+		}
+	}
+
+	return n;
+}
+
+static void yaffs_HashObject(yaffs_Object *in)
+{
+	int bucket = yaffs_HashFunction(in->objectId);
+	yaffs_Device *dev = in->myDev;
+
+	ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
+	dev->objectBucket[bucket].count++;
+}
+
+yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
+{
+	int bucket = yaffs_HashFunction(number);
+	struct ylist_head *i;
+	yaffs_Object *in;
+
+	ylist_for_each(i, &dev->objectBucket[bucket].list) {
+		/* Look if it is in the list */
+		if (i) {
+			in = ylist_entry(i, yaffs_Object, hashLink);
+			if (in->objectId == number) {
+
+				/* Don't tell the VFS about this one if it is defered free */
+				if (in->deferedFree)
+					return NULL;
+
+				return in;
+			}
+		}
+	}
+
+	return NULL;
+}
+
+yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
+				    yaffs_ObjectType type)
+{
+	yaffs_Object *theObject=NULL;
+	yaffs_Tnode *tn = NULL;
+
+	if (number < 0)
+		number = yaffs_CreateNewObjectNumber(dev);
+
+	if (type == YAFFS_OBJECT_TYPE_FILE) {
+		tn = yaffs_GetTnode(dev);
+		if (!tn)
+			return NULL;
+	}
+
+	theObject = yaffs_AllocateEmptyObject(dev);
+	if (!theObject){
+		if(tn)
+			yaffs_FreeTnode(dev,tn);
+		return NULL;
+	}
+
+
+	if (theObject) {
+		theObject->fake = 0;
+		theObject->renameAllowed = 1;
+		theObject->unlinkAllowed = 1;
+		theObject->objectId = number;
+		yaffs_HashObject(theObject);
+		theObject->variantType = type;
+#ifdef CONFIG_YAFFS_WINCE
+		yfsd_WinFileTimeNow(theObject->win_atime);
+		theObject->win_ctime[0] = theObject->win_mtime[0] =
+		    theObject->win_atime[0];
+		theObject->win_ctime[1] = theObject->win_mtime[1] =
+		    theObject->win_atime[1];
+
+#else
+
+		theObject->yst_atime = theObject->yst_mtime =
+		    theObject->yst_ctime = Y_CURRENT_TIME;
+#endif
+		switch (type) {
+		case YAFFS_OBJECT_TYPE_FILE:
+			theObject->variant.fileVariant.fileSize = 0;
+			theObject->variant.fileVariant.scannedFileSize = 0;
+			theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF;	/* max __u32 */
+			theObject->variant.fileVariant.topLevel = 0;
+			theObject->variant.fileVariant.top = tn;
+			break;
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+			YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
+					children);
+			YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
+					dirty);
+			break;
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+			/* No action required */
+			break;
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+			/* todo this should not happen */
+			break;
+		}
+	}
+
+	return theObject;
+}
+
+static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
+						      int number,
+						      yaffs_ObjectType type)
+{
+	yaffs_Object *theObject = NULL;
+
+	if (number > 0)
+		theObject = yaffs_FindObjectByNumber(dev, number);
+
+	if (!theObject)
+		theObject = yaffs_CreateNewObject(dev, number, type);
+
+	return theObject;
+
+}
+
+
+static YCHAR *yaffs_CloneString(const YCHAR *str)
+{
+	YCHAR *newStr = NULL;
+	int len;
+
+	if (!str)
+		str = _Y("");
+
+	len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH);
+	newStr = YMALLOC((len + 1) * sizeof(YCHAR));
+	if (newStr){
+		yaffs_strncpy(newStr, str,len);
+		newStr[len] = 0;
+	}
+	return newStr;
+
+}
+
+/*
+ * Mknod (create) a new object.
+ * equivalentObject only has meaning for a hard link;
+ * aliasString only has meaning for a symlink.
+ * rdev only has meaning for devices (a subset of special objects)
+ */
+
+static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
+				       yaffs_Object *parent,
+				       const YCHAR *name,
+				       __u32 mode,
+				       __u32 uid,
+				       __u32 gid,
+				       yaffs_Object *equivalentObject,
+				       const YCHAR *aliasString, __u32 rdev)
+{
+	yaffs_Object *in;
+	YCHAR *str = NULL;
+
+	yaffs_Device *dev = parent->myDev;
+
+	/* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
+	if (yaffs_FindObjectByName(parent, name))
+		return NULL;
+
+	if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
+		str = yaffs_CloneString(aliasString);
+		if (!str)
+			return NULL;
+	}
+
+	in = yaffs_CreateNewObject(dev, -1, type);
+
+	if (!in){
+		if(str)
+			YFREE(str);
+		return NULL;
+	}
+
+
+
+
+
+	if (in) {
+		in->hdrChunk = 0;
+		in->valid = 1;
+		in->variantType = type;
+
+		in->yst_mode = mode;
+
+#ifdef CONFIG_YAFFS_WINCE
+		yfsd_WinFileTimeNow(in->win_atime);
+		in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
+		in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
+
+#else
+		in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
+
+		in->yst_rdev = rdev;
+		in->yst_uid = uid;
+		in->yst_gid = gid;
+#endif
+		in->nDataChunks = 0;
+
+		yaffs_SetObjectName(in, name);
+		in->dirty = 1;
+
+		yaffs_AddObjectToDirectory(parent, in);
+
+		in->myDev = parent->myDev;
+
+		switch (type) {
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			in->variant.symLinkVariant.alias = str;
+			break;
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+			in->variant.hardLinkVariant.equivalentObject =
+				equivalentObject;
+			in->variant.hardLinkVariant.equivalentObjectId =
+				equivalentObject->objectId;
+			ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
+			break;
+		case YAFFS_OBJECT_TYPE_FILE:
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+			/* do nothing */
+			break;
+		}
+
+		if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
+			/* Could not create the object header, fail the creation */
+			yaffs_DeleteObject(in);
+			in = NULL;
+		}
+
+		yaffs_UpdateParent(parent);
+	}
+
+	return in;
+}
+
+yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
+			__u32 mode, __u32 uid, __u32 gid)
+{
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
+				uid, gid, NULL, NULL, 0);
+}
+
+yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
+				__u32 mode, __u32 uid, __u32 gid)
+{
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
+				 mode, uid, gid, NULL, NULL, 0);
+}
+
+yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
+				__u32 mode, __u32 uid, __u32 gid, __u32 rdev)
+{
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
+				 uid, gid, NULL, NULL, rdev);
+}
+
+yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
+				__u32 mode, __u32 uid, __u32 gid,
+				const YCHAR *alias)
+{
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
+				uid, gid, NULL, alias, 0);
+}
+
+/* yaffs_Link returns the object id of the equivalent object.*/
+yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
+			yaffs_Object *equivalentObject)
+{
+	/* Get the real object in case we were fed a hard link as an equivalent object */
+	equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
+
+	if (yaffs_MknodObject
+	    (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
+	     equivalentObject, NULL, 0)) {
+		return equivalentObject;
+	} else {
+		return NULL;
+	}
+
+}
+
+static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
+				const YCHAR *newName, int force, int shadows)
+{
+	int unlinkOp;
+	int deleteOp;
+
+	yaffs_Object *existingTarget;
+
+	if (newDir == NULL)
+		newDir = obj->parent;	/* use the old directory */
+
+	if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
+		    TENDSTR)));
+		YBUG();
+	}
+
+	/* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
+	if (obj->myDev->param.isYaffs2)
+		unlinkOp = (newDir == obj->myDev->unlinkedDir);
+	else
+		unlinkOp = (newDir == obj->myDev->unlinkedDir
+			    && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
+
+	deleteOp = (newDir == obj->myDev->deletedDir);
+
+	existingTarget = yaffs_FindObjectByName(newDir, newName);
+
+	/* If the object is a file going into the unlinked directory,
+	 *   then it is OK to just stuff it in since duplicate names are allowed.
+	 *   else only proceed if the new name does not exist and if we're putting
+	 *   it into a directory.
+	 */
+	if ((unlinkOp ||
+	     deleteOp ||
+	     force ||
+	     (shadows > 0) ||
+	     !existingTarget) &&
+	    newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_SetObjectName(obj, newName);
+		obj->dirty = 1;
+
+		yaffs_AddObjectToDirectory(newDir, obj);
+
+		if (unlinkOp)
+			obj->unlinked = 1;
+
+		/* If it is a deletion then we mark it as a shrink for gc purposes. */
+		if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
+			return YAFFS_OK;
+	}
+
+	return YAFFS_FAIL;
+}
+
+int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
+		yaffs_Object *newDir, const YCHAR *newName)
+{
+	yaffs_Object *obj = NULL;
+	yaffs_Object *existingTarget = NULL;
+	int force = 0;
+	int result;
+	yaffs_Device *dev;
+
+
+	if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+		YBUG();
+	if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+		YBUG();
+
+	dev = oldDir->myDev;
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+	/* Special case for case insemsitive systems (eg. WinCE).
+	 * While look-up is case insensitive, the name isn't.
+	 * Therefore we might want to change x.txt to X.txt
+	*/
+	if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
+		force = 1;
+#endif
+
+	if(yaffs_strnlen(newName,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH)
+		/* ENAMETOOLONG */
+		return YAFFS_FAIL;
+
+	obj = yaffs_FindObjectByName(oldDir, oldName);
+
+	if (obj && obj->renameAllowed) {
+
+		/* Now do the handling for an existing target, if there is one */
+
+		existingTarget = yaffs_FindObjectByName(newDir, newName);
+		if (existingTarget &&
+			existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
+			!ylist_empty(&existingTarget->variant.directoryVariant.children)) {
+			/* There is a target that is a non-empty directory, so we fail */
+			return YAFFS_FAIL;	/* EEXIST or ENOTEMPTY */
+		} else if (existingTarget && existingTarget != obj) {
+			/* Nuke the target first, using shadowing,
+			 * but only if it isn't the same object.
+			 *
+			 * Note we must disable gc otherwise it can mess up the shadowing.
+			 *
+			 */
+			dev->isDoingGC=1;
+			yaffs_ChangeObjectName(obj, newDir, newName, force,
+						existingTarget->objectId);
+			existingTarget->isShadowed = 1;
+			yaffs_UnlinkObject(existingTarget);
+			dev->isDoingGC=0;
+		}
+
+		result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
+
+		yaffs_UpdateParent(oldDir);
+		if(newDir != oldDir)
+			yaffs_UpdateParent(newDir);
+		
+		return result;
+	}
+	return YAFFS_FAIL;
+}
+
+/*------------------------- Block Management and Page Allocation ----------------*/
+
+static int yaffs_InitialiseBlocks(yaffs_Device *dev)
+{
+	int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+
+	dev->blockInfo = NULL;
+	dev->chunkBits = NULL;
+
+	dev->allocationBlock = -1;	/* force it to get a new one */
+
+	/* If the first allocation strategy fails, thry the alternate one */
+	dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
+	if (!dev->blockInfo) {
+		dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
+		dev->blockInfoAlt = 1;
+	} else
+		dev->blockInfoAlt = 0;
+
+	if (dev->blockInfo) {
+		/* Set up dynamic blockinfo stuff. */
+		dev->chunkBitmapStride = (dev->param.nChunksPerBlock + 7) / 8; /* round up bytes */
+		dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
+		if (!dev->chunkBits) {
+			dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
+			dev->chunkBitsAlt = 1;
+		} else
+			dev->chunkBitsAlt = 0;
+	}
+
+	if (dev->blockInfo && dev->chunkBits) {
+		memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
+		memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
+		return YAFFS_OK;
+	}
+
+	return YAFFS_FAIL;
+}
+
+static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
+{
+	if (dev->blockInfoAlt && dev->blockInfo)
+		YFREE_ALT(dev->blockInfo);
+	else if (dev->blockInfo)
+		YFREE(dev->blockInfo);
+
+	dev->blockInfoAlt = 0;
+
+	dev->blockInfo = NULL;
+
+	if (dev->chunkBitsAlt && dev->chunkBits)
+		YFREE_ALT(dev->chunkBits);
+	else if (dev->chunkBits)
+		YFREE(dev->chunkBits);
+	dev->chunkBitsAlt = 0;
+	dev->chunkBits = NULL;
+}
+
+static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
+					yaffs_BlockInfo *bi)
+{
+
+	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){
+	        dev->refreshSkip--;
+	        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;
+}
+
+/*
+ * FindDiretiestBlock is used to select the dirtiest block (or close enough)
+ * for garbage collection.
+ */
+
+static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
+					int aggressive)
+{
+	int b = dev->currentDirtyChecker;
+
+	int i;
+	int iterations;
+	int dirtiest = -1;
+	int pagesInUse = 0;
+	int prioritised = 0;
+	yaffs_BlockInfo *bi;
+	int pendingPrioritisedExist = 0;
+
+	/* First let's see if we need to grab a prioritised block */
+	if (dev->hasPendingPrioritisedGCs) {
+		bi = dev->blockInfo;
+		for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
+
+			if (bi->gcPrioritise) {
+				pendingPrioritisedExist = 1;
+				if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
+				   yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
+					pagesInUse = (bi->pagesInUse - bi->softDeletions);
+					dirtiest = i;
+					prioritised = 1;
+					aggressive = 1; /* Fool the non-aggressive skip logiv below */
+				}
+			}
+			bi++;
+		}
+
+		if (!pendingPrioritisedExist) /* None found, so we can clear this */
+			dev->hasPendingPrioritisedGCs = 0;
+	}
+
+	/* If we're doing aggressive GC then we are happy to take a less-dirty block, and
+	 * search harder.
+	 * else (we're doing a leasurely gc), then we only bother to do this if the
+	 * block has only a few pages in use.
+	 */
+
+	dev->nonAggressiveSkip--;
+
+	if (!aggressive && (dev->nonAggressiveSkip > 0))
+		return -1;
+
+	if (!prioritised)
+		pagesInUse =
+			(aggressive) ? dev->param.nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
+
+	if (aggressive)
+		iterations =
+		    dev->internalEndBlock - dev->internalStartBlock + 1;
+	else {
+		iterations =
+		    dev->internalEndBlock - dev->internalStartBlock + 1;
+		iterations = iterations / 16;
+		if (iterations > 200)
+			iterations = 200;
+	}
+
+	for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
+		b++;
+		if (b < dev->internalStartBlock || b > dev->internalEndBlock)
+			b = dev->internalStartBlock;
+
+		if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
+			T(YAFFS_TRACE_ERROR,
+			  (TSTR("**>> Block %d is not valid" TENDSTR), b));
+			YBUG();
+		}
+
+		bi = yaffs_GetBlockInfo(dev, b);
+
+		if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
+			(bi->pagesInUse - bi->softDeletions) < pagesInUse &&
+				yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
+			dirtiest = b;
+			pagesInUse = (bi->pagesInUse - bi->softDeletions);
+		}
+	}
+
+	dev->currentDirtyChecker = b;
+
+	if (dirtiest > 0) {
+		T(YAFFS_TRACE_GC,
+		  (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
+		   dev->param.nChunksPerBlock - pagesInUse, prioritised));
+	}
+
+	if (dirtiest > 0)
+		dev->nonAggressiveSkip = 4;
+
+	return dirtiest;
+}
+
+static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
+{
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
+
+	int erasedOk = 0;
+
+	/* If the block is still healthy erase it and mark as clean.
+	 * If the block has had a data failure, then retire it.
+	 */
+
+	T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
+		(TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
+		blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
+
+	yaffs_ClearOldestDirtySequence(dev,bi);
+
+	bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
+
+	if (!bi->needsRetiring) {
+		yaffs_InvalidateCheckpoint(dev);
+		erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
+		if (!erasedOk) {
+			dev->nErasureFailures++;
+			T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+			  (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
+		}
+	}
+
+	if (erasedOk &&
+	    ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
+		int i;
+		for (i = 0; i < dev->param.nChunksPerBlock; i++) {
+			if (!yaffs_CheckChunkErased
+			    (dev, blockNo * dev->param.nChunksPerBlock + i)) {
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   (">>Block %d erasure supposedly OK, but chunk %d not erased"
+				    TENDSTR), blockNo, i));
+			}
+		}
+	}
+
+	if (erasedOk) {
+		/* Clean it up... */
+		bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
+		bi->sequenceNumber = 0;
+		dev->nErasedBlocks++;
+		bi->pagesInUse = 0;
+		bi->softDeletions = 0;
+		bi->hasShrinkHeader = 0;
+		bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
+		bi->gcPrioritise = 0;
+		yaffs_ClearChunkBits(dev, blockNo);
+
+		T(YAFFS_TRACE_ERASE,
+		  (TSTR("Erased block %d" TENDSTR), blockNo));
+	} else {
+		dev->nFreeChunks -= dev->param.nChunksPerBlock;	/* We lost a block of free space */
+
+		yaffs_RetireBlock(dev, blockNo);
+		T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+		  (TSTR("**>> Block %d retired" TENDSTR), blockNo));
+	}
+}
+
+static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
+{
+	int i;
+
+	yaffs_BlockInfo *bi;
+
+	if (dev->nErasedBlocks < 1) {
+		/* Hoosterman we've got a problem.
+		 * Can't get space to gc
+		 */
+		T(YAFFS_TRACE_ERROR,
+		  (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
+
+		return -1;
+	}
+
+	/* Find an empty block. */
+
+	for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
+		dev->allocationBlockFinder++;
+		if (dev->allocationBlockFinder < dev->internalStartBlock
+		    || dev->allocationBlockFinder > dev->internalEndBlock) {
+			dev->allocationBlockFinder = dev->internalStartBlock;
+		}
+
+		bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
+
+		if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
+			bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
+			dev->sequenceNumber++;
+			bi->sequenceNumber = dev->sequenceNumber;
+			dev->nErasedBlocks--;
+			T(YAFFS_TRACE_ALLOCATE,
+			  (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
+			   dev->allocationBlockFinder, dev->sequenceNumber,
+			   dev->nErasedBlocks));
+			return dev->allocationBlockFinder;
+		}
+	}
+
+	T(YAFFS_TRACE_ALWAYS,
+	  (TSTR
+	   ("yaffs tragedy: no more erased blocks, but there should have been %d"
+	    TENDSTR), dev->nErasedBlocks));
+
+	return -1;
+}
+
+
+
+static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
+{
+	if (!dev->nCheckpointBlocksRequired &&
+	   dev->param.isYaffs2) {
+		/* 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 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;
+	}
+
+	reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.nChunksPerBlock);
+
+	return (dev->nFreeChunks > (reservedChunks + nChunks));
+}
+
+static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
+		yaffs_BlockInfo **blockUsedPtr)
+{
+	int retVal;
+	yaffs_BlockInfo *bi;
+
+	if (dev->allocationBlock < 0) {
+		/* Get next block to allocate off */
+		dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
+		dev->allocationPage = 0;
+	}
+
+	if (!useReserve && !yaffs_CheckSpaceForAllocation(dev, 1)) {
+		/* Not enough space to allocate unless we're allowed to use the reserve. */
+		return -1;
+	}
+
+	if (dev->nErasedBlocks < dev->param.nReservedBlocks
+			&& dev->allocationPage == 0) {
+		T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
+	}
+
+	/* Next page please.... */
+	if (dev->allocationBlock >= 0) {
+		bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
+
+		retVal = (dev->allocationBlock * dev->param.nChunksPerBlock) +
+			dev->allocationPage;
+		bi->pagesInUse++;
+		yaffs_SetChunkBit(dev, dev->allocationBlock,
+				dev->allocationPage);
+
+		dev->allocationPage++;
+
+		dev->nFreeChunks--;
+
+		/* If the block is full set the state to full */
+		if (dev->allocationPage >= dev->param.nChunksPerBlock) {
+			bi->blockState = YAFFS_BLOCK_STATE_FULL;
+			dev->allocationBlock = -1;
+		}
+
+		if (blockUsedPtr)
+			*blockUsedPtr = bi;
+
+		return retVal;
+	}
+
+	T(YAFFS_TRACE_ERROR,
+			(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
+
+	return -1;
+}
+
+static int yaffs_GetErasedChunks(yaffs_Device *dev)
+{
+	int n;
+
+	n = dev->nErasedBlocks * dev->param.nChunksPerBlock;
+
+	if (dev->allocationBlock > 0)
+		n += (dev->param.nChunksPerBlock - dev->allocationPage);
+
+	return n;
+
+}
+
+/*
+ * 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)
+{
+	if(dev->allocationBlock > 0){
+		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
+		if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){
+			bi->blockState = YAFFS_BLOCK_STATE_FULL;
+			dev->allocationBlock = -1;
+		}
+	}
+}
+
+
+static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
+		int wholeBlock)
+{
+	int oldChunk;
+	int newChunk;
+	int markNAND;
+	int retVal = YAFFS_OK;
+	int cleanups = 0;
+	int i;
+	int isCheckpointBlock;
+	int matchingChunk;
+	int maxCopies;
+
+	int chunksBefore = yaffs_GetErasedChunks(dev);
+	int chunksAfter;
+
+	yaffs_ExtendedTags tags;
+
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
+
+	yaffs_Object *object;
+
+	isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
+
+
+	T(YAFFS_TRACE_TRACING,
+			(TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
+			 block,
+			 bi->pagesInUse,
+			 bi->hasShrinkHeader,
+			 wholeBlock));
+
+	/*yaffs_VerifyFreeChunks(dev); */
+
+	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 */
+
+	/* Take off the number of soft deleted entries because
+	 * they're going to get really deleted during GC.
+	 */
+	if(dev->gcChunk == 0) /* first time through for this block */
+		dev->nFreeChunks -= bi->softDeletions;
+
+	dev->isDoingGC = 1;
+
+	if (isCheckpointBlock ||
+			!yaffs_StillSomeChunkBits(dev, block)) {
+		T(YAFFS_TRACE_TRACING,
+				(TSTR
+				 ("Collecting block %d that has no chunks in use" TENDSTR),
+				 block));
+		yaffs_BlockBecameDirty(dev, block);
+	} else {
+
+		__u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
+
+		yaffs_VerifyBlock(dev, bi, block);
+
+		maxCopies = (wholeBlock) ? dev->param.nChunksPerBlock : 10;
+		oldChunk = block * dev->param.nChunksPerBlock + dev->gcChunk;
+
+		for (/* init already done */;
+		     retVal == YAFFS_OK &&
+		     dev->gcChunk < dev->param.nChunksPerBlock &&
+		     (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
+		     maxCopies > 0;
+		     dev->gcChunk++, oldChunk++) {
+			if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
+
+				/* This page is in use and might need to be copied off */
+
+				maxCopies--;
+
+				markNAND = 1;
+
+				yaffs_InitialiseTags(&tags);
+
+				yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
+								buffer, &tags);
+
+				object =
+				    yaffs_FindObjectByNumber(dev,
+							     tags.objectId);
+
+				T(YAFFS_TRACE_GC_DETAIL,
+				  (TSTR
+				   ("Collecting chunk in block %d, %d %d %d " TENDSTR),
+				   dev->gcChunk, tags.objectId, tags.chunkId,
+				   tags.byteCount));
+
+				if (object && !yaffs_SkipVerification(dev)) {
+					if (tags.chunkId == 0)
+						matchingChunk = object->hdrChunk;
+					else if (object->softDeleted)
+						matchingChunk = oldChunk; /* Defeat the test */
+					else
+						matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
+
+					if (oldChunk != matchingChunk)
+						T(YAFFS_TRACE_ERROR,
+						  (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
+						  oldChunk, matchingChunk, tags.objectId, tags.chunkId));
+
+				}
+
+				if (!object) {
+					T(YAFFS_TRACE_ERROR,
+					  (TSTR
+					   ("page %d in gc has no object: %d %d %d "
+					    TENDSTR), oldChunk,
+					    tags.objectId, tags.chunkId, tags.byteCount));
+				}
+
+				if (object &&
+				    object->deleted &&
+				    object->softDeleted &&
+				    tags.chunkId != 0) {
+					/* Data chunk in a soft deleted file, throw it away
+					 * It's a soft deleted data chunk,
+					 * No need to copy this, just forget about it and
+					 * fix up the object.
+					 */
+
+					object->nDataChunks--;
+
+					if (object->nDataChunks <= 0) {
+						/* remeber to clean up the object */
+						dev->gcCleanupList[cleanups] =
+						    tags.objectId;
+						cleanups++;
+					}
+					markNAND = 0;
+				} else if (0) {
+					/* Todo object && object->deleted && object->nDataChunks == 0 */
+					/* Deleted object header with no data chunks.
+					 * Can be discarded and the file deleted.
+					 */
+					object->hdrChunk = 0;
+					yaffs_FreeTnode(object->myDev,
+							object->variant.
+							fileVariant.top);
+					object->variant.fileVariant.top = NULL;
+					yaffs_DoGenericObjectDeletion(object);
+
+				} else if (object) {
+					/* It's either a data chunk in a live file or
+					 * an ObjectHeader, so we're interested in it.
+					 * NB Need to keep the ObjectHeaders of deleted files
+					 * until the whole file has been deleted off
+					 */
+					tags.serialNumber++;
+
+					dev->nGCCopies++;
+
+					if (tags.chunkId == 0) {
+						/* It is an object Id,
+						 * We need to nuke the shrinkheader flags first
+						 * Also need to clean up shadowing.
+						 * We no longer want the shrinkHeader flag since its work is done
+						 * and if it is left in place it will mess up scanning.
+						 */
+
+						yaffs_ObjectHeader *oh;
+						oh = (yaffs_ObjectHeader *)buffer;
+
+						oh->isShrink = 0;
+						tags.extraIsShrinkHeader = 0;
+
+						oh->shadowsObject = 0;
+						oh->inbandShadowsObject = 0;
+						tags.extraShadows = 0;
+
+						/* Update file size */
+						if(object->variantType == YAFFS_OBJECT_TYPE_FILE){
+							oh->fileSize = object->variant.fileVariant.fileSize;
+							tags.extraFileLength = oh->fileSize;
+						}
+
+						yaffs_VerifyObjectHeader(object, oh, &tags, 1);
+						newChunk =
+						    yaffs_WriteNewChunkWithTagsToNAND(dev,(__u8 *) oh, &tags, 1);
+					} else
+						newChunk =
+						    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
+
+					if (newChunk < 0) {
+						retVal = YAFFS_FAIL;
+					} else {
+
+						/* Ok, now fix up the Tnodes etc. */
+
+						if (tags.chunkId == 0) {
+							/* It's a header */
+							object->hdrChunk =  newChunk;
+							object->serial =   tags.serialNumber;
+						} else {
+							/* It's a data chunk */
+							int ok;
+							ok = yaffs_PutChunkIntoFile
+							    (object,
+							     tags.chunkId,
+							     newChunk, 0);
+						}
+					}
+				}
+
+				if (retVal == YAFFS_OK)
+					yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
+
+			}
+		}
+
+		yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
+
+
+		/* Do any required cleanups */
+		for (i = 0; i < cleanups; i++) {
+			/* Time to delete the file too */
+			object =
+			    yaffs_FindObjectByNumber(dev,
+						     dev->gcCleanupList[i]);
+			if (object) {
+				yaffs_FreeTnode(dev,
+						object->variant.fileVariant.
+						top);
+				object->variant.fileVariant.top = NULL;
+				T(YAFFS_TRACE_GC,
+				  (TSTR
+				   ("yaffs: About to finally delete object %d"
+				    TENDSTR), object->objectId));
+				yaffs_DoGenericObjectDeletion(object);
+				object->myDev->nDeletedFiles--;
+			}
+
+		}
+
+	}
+
+	yaffs_VerifyCollectedBlock(dev, bi, block);
+
+
+
+	/* If the gc completed then clear the current gcBlock so that we find another. */
+	if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
+		chunksAfter = yaffs_GetErasedChunks(dev);
+		if (chunksBefore >= chunksAfter) {
+			T(YAFFS_TRACE_GC,
+			  (TSTR
+			   ("gc did not increase free chunks before %d after %d"
+			    TENDSTR), chunksBefore, chunksAfter));
+		}
+		dev->gcBlock = -1;
+		dev->gcChunk = 0;
+	}
+
+	dev->isDoingGC = 0;
+
+	return retVal;
+}
+
+/* New garbage collector
+ * If we're very low on erased blocks then we do aggressive garbage collection
+ * otherwise we do "leasurely" garbage collection.
+ * Aggressive gc looks further (whole array) and will accept less dirty blocks.
+ * Passive gc only inspects smaller areas and will only accept more dirty blocks.
+ *
+ * The idea is to help clear out space in a more spread-out manner.
+ * Dunno if it really does anything useful.
+ */
+static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
+{
+	int block;
+	int aggressive;
+	int gcOk = YAFFS_OK;
+	int maxTries = 0;
+
+	int checkpointBlockAdjust;
+
+	if(dev->param.gcControl &&
+		(dev->param.gcControl(dev) & 1) == 0)
+		return YAFFS_OK;
+
+	if (dev->isDoingGC) {
+		/* Bail out so we don't get recursive gc */
+		return YAFFS_OK;
+	}
+
+	/* This loop should pass the first time.
+	 * We'll only see looping here if the erase of the collected block fails.
+	 */
+
+	do {
+		maxTries++;
+
+		checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
+		if (checkpointBlockAdjust < 0)
+			checkpointBlockAdjust = 0;
+
+		/* If we need a block soon then do aggressive gc.*/
+		if (dev->nErasedBlocks < (dev->param.nReservedBlocks + checkpointBlockAdjust + 2))
+			aggressive = 1;
+		else
+			aggressive = 0;
+
+                /* 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->gcChunk = 0;
+		}
+		if (dev->gcBlock < 1) {
+			dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
+			dev->gcChunk = 0;
+		}
+
+		block = dev->gcBlock;
+
+		if (block > 0) {
+			dev->garbageCollections++;
+			if (!aggressive)
+				dev->passiveGarbageCollections++;
+
+			T(YAFFS_TRACE_GC,
+			  (TSTR
+			   ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
+			   dev->nErasedBlocks, aggressive));
+
+			gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
+		}
+
+		if (dev->nErasedBlocks < (dev->param.nReservedBlocks) && block > 0) {
+			T(YAFFS_TRACE_GC,
+			  (TSTR
+			   ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
+			    TENDSTR), dev->nErasedBlocks, maxTries, block));
+		}
+	} while ((dev->nErasedBlocks < dev->param.nReservedBlocks) &&
+		 (block > 0) &&
+		 (maxTries < 2));
+
+	return aggressive ? gcOk : YAFFS_OK;
+}
+
+/*-------------------------  TAGS --------------------------------*/
+
+static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
+			   int chunkInObject)
+{
+	return (tags->chunkId == chunkInObject &&
+		tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
+
+}
+
+
+/*-------------------- Data file manipulation -----------------*/
+
+static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
+				 yaffs_ExtendedTags *tags)
+{
+	/*Get the Tnode, then get the level 0 offset chunk offset */
+	yaffs_Tnode *tn;
+	int theChunk = -1;
+	yaffs_ExtendedTags localTags;
+	int retVal = -1;
+
+	yaffs_Device *dev = in->myDev;
+
+	if (!tags) {
+		/* Passed a NULL, so use our own tags space */
+		tags = &localTags;
+	}
+
+	tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
+
+	if (tn) {
+		theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
+
+		retVal =
+		    yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
+					   chunkInInode);
+	}
+	return retVal;
+}
+
+static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
+					  yaffs_ExtendedTags *tags)
+{
+	/* Get the Tnode, then get the level 0 offset chunk offset */
+	yaffs_Tnode *tn;
+	int theChunk = -1;
+	yaffs_ExtendedTags localTags;
+
+	yaffs_Device *dev = in->myDev;
+	int retVal = -1;
+
+	if (!tags) {
+		/* Passed a NULL, so use our own tags space */
+		tags = &localTags;
+	}
+
+	tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
+
+	if (tn) {
+
+		theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
+
+		retVal =
+		    yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
+					   chunkInInode);
+
+		/* Delete the entry in the filestructure (if found) */
+		if (retVal != -1)
+			yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0);
+	}
+
+	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)
+{
+	/* NB inScan is zero unless scanning.
+	 * For forward scanning, inScan is > 0;
+	 * for backward scanning inScan is < 0
+	 *
+	 * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there.
+	 */
+
+	yaffs_Tnode *tn;
+	yaffs_Device *dev = in->myDev;
+	int existingChunk;
+	yaffs_ExtendedTags existingTags;
+	yaffs_ExtendedTags newTags;
+	unsigned existingSerial, newSerial;
+
+	if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
+		/* Just ignore an attempt at putting a chunk into a non-file during scanning
+		 * If it is not during Scanning then something went wrong!
+		 */
+		if (!inScan) {
+			T(YAFFS_TRACE_ERROR,
+			  (TSTR
+			   ("yaffs tragedy:attempt to put data chunk into a non-file"
+			    TENDSTR)));
+			YBUG();
+		}
+
+		yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
+		return YAFFS_OK;
+	}
+
+	tn = yaffs_AddOrFindLevel0Tnode(dev,
+					&in->variant.fileVariant,
+					chunkInInode,
+					NULL);
+	if (!tn)
+		return YAFFS_FAIL;
+	
+	if(!chunkInNAND)
+		/* Dummy insert, bail now */
+		return YAFFS_OK;
+
+	existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
+
+	if (inScan != 0) {
+		/* If we're scanning then we need to test for duplicates
+		 * NB This does not need to be efficient since it should only ever
+		 * happen when the power fails during a write, then only one
+		 * chunk should ever be affected.
+		 *
+		 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
+		 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
+		 */
+
+		if (existingChunk > 0) {
+			/* NB Right now existing chunk will not be real chunkId if the device >= 32MB
+			 *    thus we have to do a FindChunkInFile to get the real chunk id.
+			 *
+			 * We have a duplicate now we need to decide which one to use:
+			 *
+			 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
+			 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
+			 * YAFFS1: Get both sets of tags and compare serial numbers.
+			 */
+
+			if (inScan > 0) {
+				/* Only do this for forward scanning */
+				yaffs_ReadChunkWithTagsFromNAND(dev,
+								chunkInNAND,
+								NULL, &newTags);
+
+				/* Do a proper find */
+				existingChunk =
+				    yaffs_FindChunkInFile(in, chunkInInode,
+							  &existingTags);
+			}
+
+			if (existingChunk <= 0) {
+				/*Hoosterman - how did this happen? */
+
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   ("yaffs tragedy: existing chunk < 0 in scan"
+				    TENDSTR)));
+
+			}
+
+			/* NB The deleted flags should be false, otherwise the chunks will
+			 * not be loaded during a scan
+			 */
+
+			if (inScan > 0) {
+				newSerial = newTags.serialNumber;
+				existingSerial = existingTags.serialNumber;
+			}
+
+			if ((inScan > 0) &&
+			    (in->myDev->param.isYaffs2 ||
+			     existingChunk <= 0 ||
+			     ((existingSerial + 1) & 3) == newSerial)) {
+				/* Forward scanning.
+				 * Use new
+				 * Delete the old one and drop through to update the tnode
+				 */
+				yaffs_DeleteChunk(dev, existingChunk, 1,
+						  __LINE__);
+			} else {
+				/* Backward scanning or we want to use the existing one
+				 * Use existing.
+				 * Delete the new one and return early so that the tnode isn't changed
+				 */
+				yaffs_DeleteChunk(dev, chunkInNAND, 1,
+						  __LINE__);
+				return YAFFS_OK;
+			}
+		}
+
+	}
+
+	if (existingChunk == 0)
+		in->nDataChunks++;
+
+	yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
+
+	return YAFFS_OK;
+}
+
+static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
+					__u8 *buffer)
+{
+	int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
+
+	if (chunkInNAND >= 0)
+		return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
+						buffer, NULL);
+	else {
+		T(YAFFS_TRACE_NANDACCESS,
+		  (TSTR("Chunk %d not found zero instead" TENDSTR),
+		   chunkInNAND));
+		/* get sane (zero) data if you read a hole */
+		memset(buffer, 0, in->myDev->nDataBytesPerChunk);
+		return 0;
+	}
+
+}
+
+void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
+{
+	int block;
+	int page;
+	yaffs_ExtendedTags tags;
+	yaffs_BlockInfo *bi;
+
+	if (chunkId <= 0)
+		return;
+
+	dev->nDeletions++;
+	block = chunkId / dev->param.nChunksPerBlock;
+	page = chunkId % dev->param.nChunksPerBlock;
+
+
+	if (!yaffs_CheckChunkBit(dev, block, page))
+		T(YAFFS_TRACE_VERIFY,
+			(TSTR("Deleting invalid chunk %d"TENDSTR),
+			 chunkId));
+
+	bi = yaffs_GetBlockInfo(dev, block);
+	
+	yaffs_UpdateOldestDirtySequence(dev,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) {
+
+		yaffs_InitialiseTags(&tags);
+
+		tags.chunkDeleted = 1;
+
+		yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
+		yaffs_HandleUpdateChunk(dev, chunkId, &tags);
+	} else {
+		dev->nUnmarkedDeletions++;
+	}
+
+	/* Pull out of the management area.
+	 * If the whole block became dirty, this will kick off an erasure.
+	 */
+	if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
+	    bi->blockState == YAFFS_BLOCK_STATE_FULL ||
+	    bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+	    bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
+		dev->nFreeChunks++;
+
+		yaffs_ClearChunkBit(dev, block, page);
+
+		bi->pagesInUse--;
+
+		if (bi->pagesInUse == 0 &&
+		    !bi->hasShrinkHeader &&
+		    bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
+		    bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+			yaffs_BlockBecameDirty(dev, block);
+		}
+
+	}
+
+}
+
+static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
+					const __u8 *buffer, int nBytes,
+					int useReserve)
+{
+	/* Find old chunk Need to do this to get serial number
+	 * Write new one and patch into tree.
+	 * Invalidate old tags.
+	 */
+
+	int prevChunkId;
+	yaffs_ExtendedTags prevTags;
+
+	int newChunkId;
+	yaffs_ExtendedTags newTags;
+
+	yaffs_Device *dev = in->myDev;
+
+	yaffs_CheckGarbageCollection(dev);
+
+	/* Get the previous chunk at this location in the file if it exists.
+	 * If it does not exist then put a zero into the tree. This creates
+	 * the tnode now, rather than later when it is harder to clean up.
+	 */
+	prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
+	if(prevChunkId < 1 &&
+		!yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0))
+		return 0;
+
+	/* Set up new tags */
+	yaffs_InitialiseTags(&newTags);
+
+	newTags.chunkId = chunkInInode;
+	newTags.objectId = in->objectId;
+	newTags.serialNumber =
+	    (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
+	newTags.byteCount = nBytes;
+
+	if (nBytes < 1 || nBytes > dev->param.totalBytesPerChunk) {
+		T(YAFFS_TRACE_ERROR,
+		(TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
+		YBUG();
+	}
+	
+		
+	newChunkId =
+	    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
+					      useReserve);
+
+	if (newChunkId > 0) {
+		yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
+
+		if (prevChunkId > 0)
+			yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
+
+		yaffs_CheckFileSanity(in);
+	}
+	return newChunkId;
+
+}
+
+/* UpdateObjectHeader updates the header on NAND for an object.
+ * If name is not NULL, then that new name is used.
+ */
+int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
+			     int isShrink, int shadows)
+{
+
+	yaffs_BlockInfo *bi;
+
+	yaffs_Device *dev = in->myDev;
+
+	int prevChunkId;
+	int retVal = 0;
+	int result = 0;
+
+	int newChunkId;
+	yaffs_ExtendedTags newTags;
+	yaffs_ExtendedTags oldTags;
+	YCHAR *alias = NULL;
+
+	__u8 *buffer = NULL;
+	YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
+
+	yaffs_ObjectHeader *oh = NULL;
+
+	yaffs_strcpy(oldName, _Y("silly old name"));
+
+
+	if (!in->fake ||
+		in == dev->rootDir || /* The rootDir should also be saved */
+		force) {
+
+		yaffs_CheckGarbageCollection(dev);
+		yaffs_CheckObjectDetailsLoaded(in);
+
+		buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
+		oh = (yaffs_ObjectHeader *) buffer;
+
+		prevChunkId = in->hdrChunk;
+
+		if (prevChunkId > 0) {
+			result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
+							buffer, &oldTags);
+
+			yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
+
+			memcpy(oldName, oh->name, sizeof(oh->name));
+		}
+
+		memset(buffer, 0xFF, dev->nDataBytesPerChunk);
+
+		oh->type = in->variantType;
+		oh->yst_mode = in->yst_mode;
+		oh->shadowsObject = oh->inbandShadowsObject = shadows;
+
+#ifdef CONFIG_YAFFS_WINCE
+		oh->win_atime[0] = in->win_atime[0];
+		oh->win_ctime[0] = in->win_ctime[0];
+		oh->win_mtime[0] = in->win_mtime[0];
+		oh->win_atime[1] = in->win_atime[1];
+		oh->win_ctime[1] = in->win_ctime[1];
+		oh->win_mtime[1] = in->win_mtime[1];
+#else
+		oh->yst_uid = in->yst_uid;
+		oh->yst_gid = in->yst_gid;
+		oh->yst_atime = in->yst_atime;
+		oh->yst_mtime = in->yst_mtime;
+		oh->yst_ctime = in->yst_ctime;
+		oh->yst_rdev = in->yst_rdev;
+#endif
+		if (in->parent)
+			oh->parentObjectId = in->parent->objectId;
+		else
+			oh->parentObjectId = 0;
+
+		if (name && *name) {
+			memset(oh->name, 0, sizeof(oh->name));
+			yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
+		} else if (prevChunkId > 0)
+			memcpy(oh->name, oldName, sizeof(oh->name));
+		else
+			memset(oh->name, 0, sizeof(oh->name));
+
+		oh->isShrink = isShrink;
+
+		switch (in->variantType) {
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+			/* Should not happen */
+			break;
+		case YAFFS_OBJECT_TYPE_FILE:
+			oh->fileSize =
+			    (oh->parentObjectId == YAFFS_OBJECTID_DELETED
+			     || oh->parentObjectId ==
+			     YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
+			    fileVariant.fileSize;
+			break;
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+			oh->equivalentObjectId =
+			    in->variant.hardLinkVariant.equivalentObjectId;
+			break;
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+			/* Do nothing */
+			break;
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+			/* Do nothing */
+			break;
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			alias = in->variant.symLinkVariant.alias;
+			if(!alias)
+				alias = _Y("no alias");
+			yaffs_strncpy(oh->alias,
+					alias,
+				      YAFFS_MAX_ALIAS_LENGTH);
+			oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+			break;
+		}
+
+		/* Tags */
+		yaffs_InitialiseTags(&newTags);
+		in->serial++;
+		newTags.chunkId = 0;
+		newTags.objectId = in->objectId;
+		newTags.serialNumber = in->serial;
+
+		/* Add extra info for file header */
+
+		newTags.extraHeaderInfoAvailable = 1;
+		newTags.extraParentObjectId = oh->parentObjectId;
+		newTags.extraFileLength = oh->fileSize;
+		newTags.extraIsShrinkHeader = oh->isShrink;
+		newTags.extraEquivalentObjectId = oh->equivalentObjectId;
+		newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
+		newTags.extraObjectType = in->variantType;
+
+		yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
+
+		/* Create new chunk in NAND */
+		newChunkId =
+		    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
+						      (prevChunkId > 0) ? 1 : 0);
+
+		if (newChunkId >= 0) {
+
+			in->hdrChunk = newChunkId;
+
+			if (prevChunkId > 0) {
+				yaffs_DeleteChunk(dev, prevChunkId, 1,
+						  __LINE__);
+			}
+
+			if (!yaffs_ObjectHasCachedWriteData(in))
+				in->dirty = 0;
+
+			/* If this was a shrink, then mark the block that the chunk lives on */
+			if (isShrink) {
+				bi = yaffs_GetBlockInfo(in->myDev,
+					newChunkId / in->myDev->param.nChunksPerBlock);
+				bi->hasShrinkHeader = 1;
+			}
+
+		}
+
+		retVal = newChunkId;
+
+	}
+
+	if (buffer)
+		yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
+
+	return retVal;
+}
+
+/*------------------------ Short Operations Cache ----------------------------------------
+ *   In many situations where there is no high level buffering (eg WinCE) a lot of
+ *   reads might be short sequential reads, and a lot of writes may be short
+ *   sequential writes. eg. scanning/writing a jpeg file.
+ *   In these cases, a short read/write cache can provide a huge perfomance benefit
+ *   with dumb-as-a-rock code.
+ *   In Linux, the page cache provides read buffering aand the short op cache provides write
+ *   buffering.
+ *
+ *   There are a limited number (~10) of cache chunks per device so that we don't
+ *   need a very intelligent search.
+ */
+
+static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
+{
+	yaffs_Device *dev = obj->myDev;
+	int i;
+	yaffs_ChunkCache *cache;
+	int nCaches = obj->myDev->param.nShortOpCaches;
+
+	for (i = 0; i < nCaches; i++) {
+		cache = &dev->srCache[i];
+		if (cache->object == obj &&
+		    cache->dirty)
+			return 1;
+	}
+
+	return 0;
+}
+
+
+static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
+{
+	yaffs_Device *dev = obj->myDev;
+	int lowest = -99;	/* Stop compiler whining. */
+	int i;
+	yaffs_ChunkCache *cache;
+	int chunkWritten = 0;
+	int nCaches = obj->myDev->param.nShortOpCaches;
+
+	if (nCaches > 0) {
+		do {
+			cache = NULL;
+
+			/* Find the dirty cache for this object with the lowest chunk id. */
+			for (i = 0; i < nCaches; i++) {
+				if (dev->srCache[i].object == obj &&
+				    dev->srCache[i].dirty) {
+					if (!cache
+					    || dev->srCache[i].chunkId <
+					    lowest) {
+						cache = &dev->srCache[i];
+						lowest = cache->chunkId;
+					}
+				}
+			}
+
+			if (cache && !cache->locked) {
+				/* Write it out and free it up */
+
+				chunkWritten =
+				    yaffs_WriteChunkDataToObject(cache->object,
+								 cache->chunkId,
+								 cache->data,
+								 cache->nBytes,
+								 1);
+				cache->dirty = 0;
+				cache->object = NULL;
+			}
+
+		} while (cache && chunkWritten > 0);
+
+		if (cache) {
+			/* Hoosterman, disk full while writing cache out. */
+			T(YAFFS_TRACE_ERROR,
+			  (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
+
+		}
+	}
+
+}
+
+/*yaffs_FlushEntireDeviceCache(dev)
+ *
+ *
+ */
+
+void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	int nCaches = dev->param.nShortOpCaches;
+	int i;
+
+	/* Find a dirty object in the cache and flush it...
+	 * until there are no further dirty objects.
+	 */
+	do {
+		obj = NULL;
+		for (i = 0; i < nCaches && !obj; i++) {
+			if (dev->srCache[i].object &&
+			    dev->srCache[i].dirty)
+				obj = dev->srCache[i].object;
+
+		}
+		if (obj)
+			yaffs_FlushFilesChunkCache(obj);
+
+	} while (obj);
+
+}
+
+
+/* Grab us a cache chunk for use.
+ * First look for an empty one.
+ * Then look for the least recently used non-dirty one.
+ * Then look for the least recently used dirty one...., flush and look again.
+ */
+static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
+{
+	int i;
+
+	if (dev->param.nShortOpCaches > 0) {
+		for (i = 0; i < dev->param.nShortOpCaches; i++) {
+			if (!dev->srCache[i].object)
+				return &dev->srCache[i];
+		}
+	}
+
+	return NULL;
+}
+
+static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
+{
+	yaffs_ChunkCache *cache;
+	yaffs_Object *theObj;
+	int usage;
+	int i;
+	int pushout;
+
+	if (dev->param.nShortOpCaches > 0) {
+		/* Try find a non-dirty one... */
+
+		cache = yaffs_GrabChunkCacheWorker(dev);
+
+		if (!cache) {
+			/* They were all dirty, find the last recently used object and flush
+			 * its cache, then  find again.
+			 * NB what's here is not very accurate, we actually flush the object
+			 * the last recently used page.
+			 */
+
+			/* With locking we can't assume we can use entry zero */
+
+			theObj = NULL;
+			usage = -1;
+			cache = NULL;
+			pushout = -1;
+
+			for (i = 0; i < dev->param.nShortOpCaches; i++) {
+				if (dev->srCache[i].object &&
+				    !dev->srCache[i].locked &&
+				    (dev->srCache[i].lastUse < usage || !cache)) {
+					usage = dev->srCache[i].lastUse;
+					theObj = dev->srCache[i].object;
+					cache = &dev->srCache[i];
+					pushout = i;
+				}
+			}
+
+			if (!cache || cache->dirty) {
+				/* Flush and try again */
+				yaffs_FlushFilesChunkCache(theObj);
+				cache = yaffs_GrabChunkCacheWorker(dev);
+			}
+
+		}
+		return cache;
+	} else
+		return NULL;
+
+}
+
+/* Find a cached chunk */
+static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
+					      int chunkId)
+{
+	yaffs_Device *dev = obj->myDev;
+	int i;
+	if (dev->param.nShortOpCaches > 0) {
+		for (i = 0; i < dev->param.nShortOpCaches; i++) {
+			if (dev->srCache[i].object == obj &&
+			    dev->srCache[i].chunkId == chunkId) {
+				dev->cacheHits++;
+
+				return &dev->srCache[i];
+			}
+		}
+	}
+	return NULL;
+}
+
+/* Mark the chunk for the least recently used algorithym */
+static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
+				int isAWrite)
+{
+
+	if (dev->param.nShortOpCaches > 0) {
+		if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
+			/* Reset the cache usages */
+			int i;
+			for (i = 1; i < dev->param.nShortOpCaches; i++)
+				dev->srCache[i].lastUse = 0;
+
+			dev->srLastUse = 0;
+		}
+
+		dev->srLastUse++;
+
+		cache->lastUse = dev->srLastUse;
+
+		if (isAWrite)
+			cache->dirty = 1;
+	}
+}
+
+/* Invalidate a single cache page.
+ * Do this when a whole page gets written,
+ * ie the short cache for this page is no longer valid.
+ */
+static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
+{
+	if (object->myDev->param.nShortOpCaches > 0) {
+		yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
+
+		if (cache)
+			cache->object = NULL;
+	}
+}
+
+/* Invalidate all the cache pages associated with this object
+ * Do this whenever ther file is deleted or resized.
+ */
+static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
+{
+	int i;
+	yaffs_Device *dev = in->myDev;
+
+	if (dev->param.nShortOpCaches > 0) {
+		/* Invalidate it. */
+		for (i = 0; i < dev->param.nShortOpCaches; i++) {
+			if (dev->srCache[i].object == in)
+				dev->srCache[i].object = NULL;
+		}
+	}
+}
+
+/*--------------------- Checkpointing --------------------*/
+
+
+static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
+{
+	yaffs_CheckpointValidity cp;
+
+	memset(&cp, 0, sizeof(cp));
+
+	cp.structType = sizeof(cp);
+	cp.magic = YAFFS_MAGIC;
+	cp.version = YAFFS_CHECKPOINT_VERSION;
+	cp.head = (head) ? 1 : 0;
+
+	return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
+		1 : 0;
+}
+
+static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
+{
+	yaffs_CheckpointValidity cp;
+	int ok;
+
+	ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+	if (ok)
+		ok = (cp.structType == sizeof(cp)) &&
+		     (cp.magic == YAFFS_MAGIC) &&
+		     (cp.version == YAFFS_CHECKPOINT_VERSION) &&
+		     (cp.head == ((head) ? 1 : 0));
+	return ok ? 1 : 0;
+}
+
+static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
+					   yaffs_Device *dev)
+{
+	cp->nErasedBlocks = dev->nErasedBlocks;
+	cp->allocationBlock = dev->allocationBlock;
+	cp->allocationPage = dev->allocationPage;
+	cp->nFreeChunks = dev->nFreeChunks;
+
+	cp->nDeletedFiles = dev->nDeletedFiles;
+	cp->nUnlinkedFiles = dev->nUnlinkedFiles;
+	cp->nBackgroundDeletions = dev->nBackgroundDeletions;
+	cp->sequenceNumber = dev->sequenceNumber;
+
+}
+
+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 (dev->param.skipCheckpointWrite || !dev->param.isYaffs2) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
+		ok = 0;
+	}
+
+	if (ok)
+		ok = yaffs_CheckpointOpen(dev, 1);
+
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
+		ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
+	}
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
+		ok = yaffs_WriteCheckpointDevice(dev);
+	}
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
+		ok = yaffs_WriteCheckpointObjects(dev);
+	}
+	if (ok) {
+		T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
+		ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
+	}
+
+	if (ok)
+		ok = yaffs_WriteCheckpointSum(dev);
+
+	if (!yaffs_CheckpointClose(dev))
+		ok = 0;
+
+	if (ok)
+		dev->isCheckpointed = 1;
+	else
+		dev->isCheckpointed = 0;
+
+	return dev->isCheckpointed;
+}
+
+static int yaffs_ReadCheckpointData(yaffs_Device *dev)
+{
+	int ok = 1;
+
+	if (dev->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.
+ * In general the read/write has three parts to it
+ * An incomplete chunk to start with (if the read/write is not chunk-aligned)
+ * Some complete chunks
+ * An incomplete chunk to end off with
+ *
+ * Curve-balls: the first chunk might also be the last chunk.
+ */
+
+int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
+			int nBytes)
+{
+
+	int chunk;
+	__u32 start;
+	int nToCopy;
+	int n = nBytes;
+	int nDone = 0;
+	yaffs_ChunkCache *cache;
+
+	yaffs_Device *dev;
+
+	dev = in->myDev;
+
+	while (n > 0) {
+		/* chunk = offset / dev->nDataBytesPerChunk + 1; */
+		/* start = offset % dev->nDataBytesPerChunk; */
+		yaffs_AddrToChunk(dev, offset, &chunk, &start);
+		chunk++;
+
+		/* OK now check for the curveball where the start and end are in
+		 * the same chunk.
+		 */
+		if ((start + n) < dev->nDataBytesPerChunk)
+			nToCopy = n;
+		else
+			nToCopy = dev->nDataBytesPerChunk - start;
+
+		cache = yaffs_FindChunkCache(in, chunk);
+
+		/* If the chunk is already in the cache or it is less than a whole chunk
+		 * or we're using inband tags then use the cache (if there is caching)
+		 * else bypass the cache.
+		 */
+		if (cache || nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
+			if (dev->param.nShortOpCaches > 0) {
+
+				/* If we can't find the data in the cache, then load it up. */
+
+				if (!cache) {
+					cache = yaffs_GrabChunkCache(in->myDev);
+					cache->object = in;
+					cache->chunkId = chunk;
+					cache->dirty = 0;
+					cache->locked = 0;
+					yaffs_ReadChunkDataFromObject(in, chunk,
+								      cache->
+								      data);
+					cache->nBytes = 0;
+				}
+
+				yaffs_UseChunkCache(dev, cache, 0);
+
+				cache->locked = 1;
+
+
+				memcpy(buffer, &cache->data[start], nToCopy);
+
+				cache->locked = 0;
+			} else {
+				/* Read into the local buffer then copy..*/
+
+				__u8 *localBuffer =
+				    yaffs_GetTempBuffer(dev, __LINE__);
+				yaffs_ReadChunkDataFromObject(in, chunk,
+							      localBuffer);
+
+				memcpy(buffer, &localBuffer[start], nToCopy);
+
+
+				yaffs_ReleaseTempBuffer(dev, localBuffer,
+							__LINE__);
+			}
+
+		} else {
+
+			/* A full chunk. Read directly into the supplied buffer. */
+			yaffs_ReadChunkDataFromObject(in, chunk, buffer);
+
+		}
+
+		n -= nToCopy;
+		offset += nToCopy;
+		buffer += nToCopy;
+		nDone += nToCopy;
+
+	}
+
+	return nDone;
+}
+
+int yaffs_DoWriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
+			int nBytes, int writeThrough)
+{
+
+	int chunk;
+	__u32 start;
+	int nToCopy;
+	int n = nBytes;
+	int nDone = 0;
+	int nToWriteBack;
+	int startOfWrite = offset;
+	int chunkWritten = 0;
+	__u32 nBytesRead;
+	__u32 chunkStart;
+
+	yaffs_Device *dev;
+
+	dev = in->myDev;
+
+	while (n > 0 && chunkWritten >= 0) {
+		/* chunk = offset / dev->nDataBytesPerChunk + 1; */
+		/* start = offset % dev->nDataBytesPerChunk; */
+		yaffs_AddrToChunk(dev, offset, &chunk, &start);
+
+		if (chunk * dev->nDataBytesPerChunk + start != offset ||
+				start >= dev->nDataBytesPerChunk) {
+			T(YAFFS_TRACE_ERROR, (
+			   TSTR("AddrToChunk of offset %d gives chunk %d start %d"
+			   TENDSTR),
+			   (int)offset, chunk, start));
+		}
+		chunk++;
+
+		/* OK now check for the curveball where the start and end are in
+		 * the same chunk.
+		 */
+
+		if ((start + n) < dev->nDataBytesPerChunk) {
+			nToCopy = n;
+
+			/* Now folks, to calculate how many bytes to write back....
+			 * If we're overwriting and not writing to then end of file then
+			 * we need to write back as much as was there before.
+			 */
+
+			chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
+
+			if (chunkStart > in->variant.fileVariant.fileSize)
+				nBytesRead = 0; /* Past end of file */
+			else
+				nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
+
+			if (nBytesRead > dev->nDataBytesPerChunk)
+				nBytesRead = dev->nDataBytesPerChunk;
+
+			nToWriteBack =
+			    (nBytesRead >
+			     (start + n)) ? nBytesRead : (start + n);
+
+			if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
+				YBUG();
+
+		} else {
+			nToCopy = dev->nDataBytesPerChunk - start;
+			nToWriteBack = dev->nDataBytesPerChunk;
+		}
+
+		if (nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
+			/* An incomplete start or end chunk (or maybe both start and end chunk),
+			 * or we're using inband tags, so we want to use the cache buffers.
+			 */
+			if (dev->param.nShortOpCaches > 0) {
+				yaffs_ChunkCache *cache;
+				/* If we can't find the data in the cache, then load the cache */
+				cache = yaffs_FindChunkCache(in, chunk);
+
+				if (!cache
+				    && yaffs_CheckSpaceForAllocation(dev, 1)) {
+					cache = yaffs_GrabChunkCache(dev);
+					cache->object = in;
+					cache->chunkId = chunk;
+					cache->dirty = 0;
+					cache->locked = 0;
+					yaffs_ReadChunkDataFromObject(in, chunk,
+								      cache->data);
+				} else if (cache &&
+					!cache->dirty &&
+					!yaffs_CheckSpaceForAllocation(dev, 1)) {
+					/* Drop the cache if it was a read cache item and
+					 * no space check has been made for it.
+					 */
+					 cache = NULL;
+				}
+
+				if (cache) {
+					yaffs_UseChunkCache(dev, cache, 1);
+					cache->locked = 1;
+
+
+					memcpy(&cache->data[start], buffer,
+					       nToCopy);
+
+
+					cache->locked = 0;
+					cache->nBytes = nToWriteBack;
+
+					if (writeThrough) {
+						chunkWritten =
+						    yaffs_WriteChunkDataToObject
+						    (cache->object,
+						     cache->chunkId,
+						     cache->data, cache->nBytes,
+						     1);
+						cache->dirty = 0;
+					}
+
+				} else {
+					chunkWritten = -1;	/* fail the write */
+				}
+			} else {
+				/* An incomplete start or end chunk (or maybe both start and end chunk)
+				 * Read into the local buffer then copy, then copy over and write back.
+				 */
+
+				__u8 *localBuffer =
+				    yaffs_GetTempBuffer(dev, __LINE__);
+
+				yaffs_ReadChunkDataFromObject(in, chunk,
+							      localBuffer);
+
+
+
+				memcpy(&localBuffer[start], buffer, nToCopy);
+
+				chunkWritten =
+				    yaffs_WriteChunkDataToObject(in, chunk,
+								 localBuffer,
+								 nToWriteBack,
+								 0);
+
+				yaffs_ReleaseTempBuffer(dev, localBuffer,
+							__LINE__);
+
+			}
+
+		} else {
+			/* A full chunk. Write directly from the supplied buffer. */
+
+
+
+			chunkWritten =
+			    yaffs_WriteChunkDataToObject(in, chunk, buffer,
+							 dev->nDataBytesPerChunk,
+							 0);
+
+			/* Since we've overwritten the cached data, we better invalidate it. */
+			yaffs_InvalidateChunkCache(in, chunk);
+		}
+
+		if (chunkWritten >= 0) {
+			n -= nToCopy;
+			offset += nToCopy;
+			buffer += nToCopy;
+			nDone += nToCopy;
+		}
+
+	}
+
+	/* Update file object */
+
+	if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
+		in->variant.fileVariant.fileSize = (startOfWrite + nDone);
+
+	in->dirty = 1;
+
+	return nDone;
+}
+
+int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
+			int nBytes, int writeThrough)
+{
+	yaffs_HandleHole(in,offset);
+	return yaffs_DoWriteDataToFile(in,buffer,offset,nBytes,writeThrough);
+}
+
+
+
+/* ---------------------- File resizing stuff ------------------ */
+
+static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
+{
+
+	yaffs_Device *dev = in->myDev;
+	int oldFileSize = in->variant.fileVariant.fileSize;
+
+	int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
+
+	int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
+	    dev->nDataBytesPerChunk;
+	int i;
+	int chunkId;
+
+	/* Delete backwards so that we don't end up with holes if
+	 * power is lost part-way through the operation.
+	 */
+	for (i = lastDel; i >= startDel; i--) {
+		/* NB this could be optimised somewhat,
+		 * eg. could retrieve the tags and write them without
+		 * using yaffs_DeleteChunk
+		 */
+
+		chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
+		if (chunkId > 0) {
+			if (chunkId <
+			    (dev->internalStartBlock * dev->param.nChunksPerBlock)
+			    || chunkId >=
+			    ((dev->internalEndBlock +
+			      1) * dev->param.nChunksPerBlock)) {
+				T(YAFFS_TRACE_ALWAYS,
+				  (TSTR("Found daft chunkId %d for %d" TENDSTR),
+				   chunkId, i));
+			} else {
+				in->nDataChunks--;
+				yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
+			}
+		}
+	}
+
+}
+
+
+static void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize)
+{
+	int newFullChunks;
+	__u32 newSizeOfPartialChunk;
+	yaffs_Device *dev = obj->myDev;
+
+	yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
+
+	yaffs_PruneResizedChunks(obj, newSize);
+
+	if (newSizeOfPartialChunk != 0) {
+		int lastChunk = 1 + newFullChunks;
+		__u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
+
+		/* Got to read and rewrite the last chunk with its new size and zero pad */
+		yaffs_ReadChunkDataFromObject(obj, lastChunk, localBuffer);
+		memset(localBuffer + newSizeOfPartialChunk, 0,
+			dev->nDataBytesPerChunk - newSizeOfPartialChunk);
+
+		yaffs_WriteChunkDataToObject(obj, lastChunk, localBuffer,
+					     newSizeOfPartialChunk, 1);
+
+		yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
+	}
+
+	obj->variant.fileVariant.fileSize = newSize;
+
+	yaffs_PruneFileStructure(dev, &obj->variant.fileVariant);
+}
+
+
+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;
+	int oldFileSize = in->variant.fileVariant.fileSize;
+
+	yaffs_FlushFilesChunkCache(in);
+	yaffs_InvalidateWholeChunkCache(in);
+
+	yaffs_CheckGarbageCollection(dev);
+
+	if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
+		return YAFFS_FAIL;
+
+	if (newSize == oldFileSize)
+		return YAFFS_OK;
+		
+	if(newSize > oldFileSize){
+		yaffs_HandleHole(in,newSize);
+		in->variant.fileVariant.fileSize = newSize;
+	} else {
+		/* newSize < oldFileSize */ 
+		yaffs_ResizeDown(in, newSize);
+	} 
+
+	/* Write a new object header to reflect the resize.
+	 * show we've shrunk the file, if need be
+	 * Do this only if the file is not in the deleted directories
+	 * and is not shadowed.
+	 */
+	if (in->parent &&
+	    !in->isShadowed &&
+	    in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
+	    in->parent->objectId != YAFFS_OBJECTID_DELETED)
+		yaffs_UpdateObjectHeader(in, NULL, 0,0,0);
+
+
+	return YAFFS_OK;
+}
+
+loff_t yaffs_GetFileSize(yaffs_Object *obj)
+{
+	YCHAR *alias = NULL;
+	obj = yaffs_GetEquivalentObject(obj);
+
+	switch (obj->variantType) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		return obj->variant.fileVariant.fileSize;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		alias = obj->variant.symLinkVariant.alias;
+		if(!alias)
+			return 0;
+		return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
+	default:
+		return 0;
+	}
+}
+
+
+
+int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
+{
+	int retVal;
+	if (in->dirty) {
+		yaffs_FlushFilesChunkCache(in);
+		if(dataSync) /* Only sync data */
+			retVal=YAFFS_OK;
+		else {
+			if (updateTime) {
+#ifdef CONFIG_YAFFS_WINCE
+				yfsd_WinFileTimeNow(in->win_mtime);
+#else
+
+				in->yst_mtime = Y_CURRENT_TIME;
+
+#endif
+			}
+
+			retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
+				0) ? YAFFS_OK : YAFFS_FAIL;
+		}
+	} else {
+		retVal = YAFFS_OK;
+	}
+
+	return retVal;
+
+}
+
+static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
+{
+
+	/* First off, invalidate the file's data in the cache, without flushing. */
+	yaffs_InvalidateWholeChunkCache(in);
+
+	if (in->myDev->param.isYaffs2 && (in->parent != in->myDev->deletedDir)) {
+		/* Move to the unlinked directory so we have a record that it was deleted. */
+		yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
+
+	}
+
+	yaffs_RemoveObjectFromDirectory(in);
+	yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
+	in->hdrChunk = 0;
+
+	yaffs_FreeObject(in);
+	return YAFFS_OK;
+
+}
+
+/* yaffs_DeleteFile deletes the whole file data
+ * and the inode associated with the file.
+ * It does not delete the links associated with the file.
+ */
+static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
+{
+
+	int retVal;
+	int immediateDeletion = 0;
+
+	if (!in->myInode)
+		immediateDeletion = 1;
+
+	if (immediateDeletion) {
+		retVal =
+		    yaffs_ChangeObjectName(in, in->myDev->deletedDir,
+					   _Y("deleted"), 0, 0);
+		T(YAFFS_TRACE_TRACING,
+		  (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
+		   in->objectId));
+		in->deleted = 1;
+		in->myDev->nDeletedFiles++;
+		if (1 || in->myDev->param.isYaffs2)
+			yaffs_ResizeFile(in, 0);
+		yaffs_SoftDeleteFile(in);
+	} else {
+		retVal =
+		    yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
+					   _Y("unlinked"), 0, 0);
+	}
+
+
+	return retVal;
+}
+
+int yaffs_DeleteFile(yaffs_Object *in)
+{
+	int retVal = YAFFS_OK;
+	int deleted = in->deleted;
+
+	yaffs_ResizeFile(in, 0);
+
+	if (in->nDataChunks > 0) {
+		/* Use soft deletion if there is data in the file.
+		 * That won't be the case if it has been resized to zero.
+		 */
+		if (!in->unlinked)
+			retVal = yaffs_UnlinkFileIfNeeded(in);
+
+		if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
+			in->deleted = 1;
+			deleted = 1;
+			in->myDev->nDeletedFiles++;
+			yaffs_SoftDeleteFile(in);
+		}
+		return deleted ? YAFFS_OK : YAFFS_FAIL;
+	} else {
+		/* The file has no data chunks so we toss it immediately */
+		yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
+		in->variant.fileVariant.top = NULL;
+		yaffs_DoGenericObjectDeletion(in);
+
+		return YAFFS_OK;
+	}
+}
+
+static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
+{
+	return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
+		!(ylist_empty(&obj->variant.directoryVariant.children));
+}
+
+static int yaffs_DeleteDirectory(yaffs_Object *obj)
+{
+	/* First check that the directory is empty. */
+	if (yaffs_IsNonEmptyDirectory(obj))
+		return YAFFS_FAIL;
+
+	return yaffs_DoGenericObjectDeletion(obj);
+}
+
+static int yaffs_DeleteSymLink(yaffs_Object *in)
+{
+	if(in->variant.symLinkVariant.alias)
+		YFREE(in->variant.symLinkVariant.alias);
+	in->variant.symLinkVariant.alias=NULL;
+
+	return yaffs_DoGenericObjectDeletion(in);
+}
+
+static int yaffs_DeleteHardLink(yaffs_Object *in)
+{
+	/* remove this hardlink from the list assocaited with the equivalent
+	 * object
+	 */
+	ylist_del_init(&in->hardLinks);
+	return yaffs_DoGenericObjectDeletion(in);
+}
+
+int yaffs_DeleteObject(yaffs_Object *obj)
+{
+int retVal = -1;
+	switch (obj->variantType) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		retVal = yaffs_DeleteFile(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		if(!ylist_empty(&obj->variant.directoryVariant.dirty)){
+			T(YAFFS_TRACE_BACKGROUND, (TSTR("Remove object %d from dirty directories" TENDSTR),obj->objectId));
+			ylist_del_init(&obj->variant.directoryVariant.dirty);
+		}
+		return yaffs_DeleteDirectory(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		retVal = yaffs_DeleteSymLink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		retVal = yaffs_DeleteHardLink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		retVal = yaffs_DoGenericObjectDeletion(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		retVal = 0;
+		break;		/* should not happen. */
+	}
+
+	return retVal;
+}
+
+static int yaffs_UnlinkWorker(yaffs_Object *obj)
+{
+
+	int immediateDeletion = 0;
+
+	if (!obj->myInode)
+		immediateDeletion = 1;
+
+	if(obj)
+		yaffs_UpdateParent(obj->parent);
+
+	if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
+		return yaffs_DeleteHardLink(obj);
+	} else if (!ylist_empty(&obj->hardLinks)) {
+		/* Curve ball: We're unlinking an object that has a hardlink.
+		 *
+		 * This problem arises because we are not strictly following
+		 * The Linux link/inode model.
+		 *
+		 * We can't really delete the object.
+		 * Instead, we do the following:
+		 * - Select a hardlink.
+		 * - Unhook it from the hard links
+		 * - Move it from its parent directory (so that the rename can work)
+		 * - Rename the object to the hardlink's name.
+		 * - Delete the hardlink
+		 */
+
+		yaffs_Object *hl;
+		yaffs_Object *parent;
+		int retVal;
+		YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+
+		hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
+
+		yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
+		parent = hl->parent;
+
+		ylist_del_init(&hl->hardLinks);
+
+ 		yaffs_AddObjectToDirectory(obj->myDev->unlinkedDir, hl);
+
+		retVal = yaffs_ChangeObjectName(obj,parent, name, 0, 0);
+
+		if (retVal == YAFFS_OK)
+			retVal = yaffs_DoGenericObjectDeletion(hl);
+
+		return retVal;
+
+	} else if (immediateDeletion) {
+		switch (obj->variantType) {
+		case YAFFS_OBJECT_TYPE_FILE:
+			return yaffs_DeleteFile(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+			ylist_del_init(&obj->variant.directoryVariant.dirty);
+			return yaffs_DeleteDirectory(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			return yaffs_DeleteSymLink(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+			return yaffs_DoGenericObjectDeletion(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+		default:
+			return YAFFS_FAIL;
+		}
+	} else if(yaffs_IsNonEmptyDirectory(obj))
+		return YAFFS_FAIL;
+	else
+		return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
+					   _Y("unlinked"), 0, 0);
+}
+
+
+static int yaffs_UnlinkObject(yaffs_Object *obj)
+{
+
+	if (obj && obj->unlinkAllowed)
+		return yaffs_UnlinkWorker(obj);
+
+	return YAFFS_FAIL;
+
+}
+int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
+{
+	yaffs_Object *obj;
+
+	obj = yaffs_FindObjectByName(dir, name);
+	return yaffs_UnlinkObject(obj);
+}
+
+/*----------------------- Initialisation Scanning ---------------------- */
+
+static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
+				int backwardScanning)
+{
+	yaffs_Object *obj;
+
+	if (!backwardScanning) {
+		/* Handle YAFFS1 forward scanning case
+		 * For YAFFS1 we always do the deletion
+		 */
+
+	} else {
+		/* Handle YAFFS2 case (backward scanning)
+		 * If the shadowed object exists then ignore.
+		 */
+		obj = yaffs_FindObjectByNumber(dev, objId);
+		if(obj)
+			return;
+	}
+
+	/* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
+	 * We put it in unlinked dir to be cleaned up after the scanning
+	 */
+	obj =
+	    yaffs_FindOrCreateObjectByNumber(dev, objId,
+					     YAFFS_OBJECT_TYPE_FILE);
+	if (!obj)
+		return;
+	obj->isShadowed = 1;
+	yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
+	obj->variant.fileVariant.shrinkSize = 0;
+	obj->valid = 1;		/* So that we don't read any other info for this file */
+
+}
+
+typedef struct {
+	int seq;
+	int block;
+} yaffs_BlockIndex;
+
+
+static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
+{
+	yaffs_Object *hl;
+	yaffs_Object *in;
+
+	while (hardList) {
+		hl = hardList;
+		hardList = (yaffs_Object *) (hardList->hardLinks.next);
+
+		in = yaffs_FindObjectByNumber(dev,
+					      hl->variant.hardLinkVariant.
+					      equivalentObjectId);
+
+		if (in) {
+			/* Add the hardlink pointers */
+			hl->variant.hardLinkVariant.equivalentObject = in;
+			ylist_add(&hl->hardLinks, &in->hardLinks);
+		} else {
+			/* Todo Need to report/handle this better.
+			 * Got a problem... hardlink to a non-existant object
+			 */
+			hl->variant.hardLinkVariant.equivalentObject = NULL;
+			YINIT_LIST_HEAD(&hl->hardLinks);
+
+		}
+	}
+}
+
+
+
+
+
+static int ybicmp(const void *a, const void *b)
+{
+	register int aseq = ((yaffs_BlockIndex *)a)->seq;
+	register int bseq = ((yaffs_BlockIndex *)b)->seq;
+	register int ablock = ((yaffs_BlockIndex *)a)->block;
+	register int bblock = ((yaffs_BlockIndex *)b)->block;
+	if (aseq == bseq)
+		return ablock - bblock;
+	else
+		return aseq - bseq;
+}
+
+
+struct yaffs_ShadowFixerStruct {
+	int objectId;
+	int shadowedId;
+	struct yaffs_ShadowFixerStruct *next;
+};
+
+
+static void yaffs_StripDeletedObjects(yaffs_Device *dev)
+{
+	/*
+	*  Sort out state of unlinked and deleted objects after scanning.
+	*/
+	struct ylist_head *i;
+	struct ylist_head *n;
+	yaffs_Object *l;
+
+	/* Soft delete all the unlinked files */
+	ylist_for_each_safe(i, n,
+		&dev->unlinkedDir->variant.directoryVariant.children) {
+		if (i) {
+			l = ylist_entry(i, yaffs_Object, siblings);
+			yaffs_DeleteObject(l);
+		}
+	}
+
+	ylist_for_each_safe(i, n,
+		&dev->deletedDir->variant.directoryVariant.children) {
+		if (i) {
+			l = ylist_entry(i, yaffs_Object, siblings);
+			yaffs_DeleteObject(l);
+		}
+	}
+
+}
+
+/*
+ * This code iterates through all the objects making sure that they are rooted.
+ * Any unrooted objects are re-rooted in lost+found.
+ * An object needs to be in one of:
+ * - Directly under deleted, unlinked
+ * - Directly or indirectly under root.
+ *
+ * Note:
+ *  This code assumes that we don't ever change the current relationships between
+ *  directories:
+ *   rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL
+ *   lostNfound->parent == rootDir
+ *
+ * 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 ||
+		obj == dev->unlinkedDir||
+		obj == dev->rootDir);
+}
+
+static void yaffs_FixHangingObjects(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	yaffs_Object *parent;
+	int i;
+	struct ylist_head *lh;
+	struct ylist_head *n;
+	int depthLimit;
+	int hanging;
+
+
+	/* Iterate through the objects in each hash entry,
+	 * looking at each object.
+	 * Make sure it is rooted.
+	 */
+
+	for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
+		ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) {
+			if (lh) {
+				obj = ylist_entry(lh, yaffs_Object, hashLink);
+				parent= obj->parent;
+				
+				if(yaffs_HasNULLParent(dev,obj)){
+					/* These directories are not hanging */
+					hanging = 0;
+				}
+				else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+					hanging = 1;
+				else if(yaffs_HasNULLParent(dev,parent))
+					hanging = 0;
+				else {
+					/*
+					 * Need to follow the parent chain to see if it is hanging.
+					 */
+					hanging = 0;
+					depthLimit=100;
+
+					while(parent != dev->rootDir &&
+						parent->parent &&
+						parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
+						depthLimit > 0){
+						parent = parent->parent;
+						depthLimit--;
+					}
+					if(parent != dev->rootDir)
+						hanging = 1;
+				}
+				if(hanging){
+					T(YAFFS_TRACE_SCAN,
+					  (TSTR("Hanging object %d moved to lost and found" TENDSTR),
+					  	obj->objectId));
+					yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj);
+				}
+			}
+		}
+	}
+}
+
+
+/*
+ * Delete directory contents for cleaning up lost and found.
+ */
+static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
+{
+	yaffs_Object *obj;
+	struct ylist_head *lh;
+	struct ylist_head *n;
+
+	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);
+			if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
+				yaffs_DeleteDirectoryContents(obj);
+
+			T(YAFFS_TRACE_SCAN,
+				(TSTR("Deleting lost_found object %d" TENDSTR),
+				obj->objectId));
+
+			/* Need to use UnlinkObject since Delete would not handle
+			 * hardlinked objects correctly.
+			 */
+			yaffs_UnlinkObject(obj); 
+		}
+	}
+			
+}
+
+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;
+	yaffs_ObjectHeader *oh;
+	yaffs_Device *dev;
+	yaffs_ExtendedTags tags;
+	int result;
+	int alloc_failed = 0;
+
+	if (!in)
+		return;
+
+	dev = in->myDev;
+
+#if 0
+	T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
+		in->objectId,
+		in->lazyLoaded ? "not yet" : "already"));
+#endif
+
+	if (in->lazyLoaded && in->hdrChunk > 0) {
+		in->lazyLoaded = 0;
+		chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+
+		result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
+		oh = (yaffs_ObjectHeader *) chunkData;
+
+		in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+		in->win_atime[0] = oh->win_atime[0];
+		in->win_ctime[0] = oh->win_ctime[0];
+		in->win_mtime[0] = oh->win_mtime[0];
+		in->win_atime[1] = oh->win_atime[1];
+		in->win_ctime[1] = oh->win_ctime[1];
+		in->win_mtime[1] = oh->win_mtime[1];
+#else
+		in->yst_uid = oh->yst_uid;
+		in->yst_gid = oh->yst_gid;
+		in->yst_atime = oh->yst_atime;
+		in->yst_mtime = oh->yst_mtime;
+		in->yst_ctime = oh->yst_ctime;
+		in->yst_rdev = oh->yst_rdev;
+
+#endif
+		yaffs_SetObjectName(in, oh->name);
+
+		if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
+			in->variant.symLinkVariant.alias =
+						    yaffs_CloneString(oh->alias);
+			if (!in->variant.symLinkVariant.alias)
+				alloc_failed = 1; /* Not returned to caller */
+		}
+
+		yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+	}
+}
+
+static int yaffs_ScanBackwards(yaffs_Device *dev)
+{
+	yaffs_ExtendedTags tags;
+	int blk;
+	int blockIterator;
+	int startIterator;
+	int endIterator;
+	int nBlocksToScan = 0;
+
+	int chunk;
+	int result;
+	int c;
+	int deleted;
+	yaffs_BlockState state;
+	yaffs_Object *hardList = NULL;
+	yaffs_BlockInfo *bi;
+	__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_ALWAYS,
+							 (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.
+ *
+ * ie.
+ *   create dir/a : update dir's mtime/ctime
+ *   rm dir/a:   update dir's mtime/ctime
+ *   modify dir/a: don't update dir's mtimme/ctime
+ *
+ * This can be handled immediately or defered. Defering helps reduce the number
+ * of updates when many files in a directory are changed within a brief period.
+ *
+ * If the directory updating is defered then yaffs_UpdateDirtyDirecories must be
+ * called periodically.
+ */
+ 
+static void yaffs_UpdateParent(yaffs_Object *obj)
+{
+	yaffs_Device *dev;
+	if(!obj)
+		return;
+
+	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; 
+	
+		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);
+}
+
+void yaffs_UpdateDirtyDirectories(yaffs_Device *dev)
+{
+	struct ylist_head *link;
+	yaffs_Object *obj;
+	yaffs_DirectoryStructure *dS;
+	yaffs_ObjectVariant *oV;
+
+	T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR)));
+
+	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);
+
+		T(YAFFS_TRACE_BACKGROUND, (TSTR("Update directory %d" TENDSTR), obj->objectId));
+
+		if(obj->dirty)
+			yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
+	}
+}
+
+static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
+{
+	yaffs_Device *dev = obj->myDev;
+	yaffs_Object *parent;
+
+	yaffs_VerifyObjectInDirectory(obj);
+	parent = obj->parent;
+
+	yaffs_VerifyDirectory(parent);
+
+	if (dev && dev->param.removeObjectCallback)
+		dev->param.removeObjectCallback(obj);
+
+
+	ylist_del_init(&obj->siblings);
+	obj->parent = NULL;
+	
+	yaffs_VerifyDirectory(parent);
+}
+
+static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
+					yaffs_Object *obj)
+{
+	if (!directory) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: Trying to add an object to a null pointer directory"
+		    TENDSTR)));
+		YBUG();
+		return;
+	}
+	if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: Trying to add an object to a non-directory"
+		    TENDSTR)));
+		YBUG();
+	}
+
+	if (obj->siblings.prev == NULL) {
+		/* Not initialised */
+		YBUG();
+	}
+
+
+	yaffs_VerifyDirectory(directory);
+
+	yaffs_RemoveObjectFromDirectory(obj);
+
+
+	/* Now add it */
+	ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
+	obj->parent = directory;
+
+	if (directory == obj->myDev->unlinkedDir
+			|| directory == obj->myDev->deletedDir) {
+		obj->unlinked = 1;
+		obj->myDev->nUnlinkedFiles++;
+		obj->renameAllowed = 0;
+	}
+
+	yaffs_VerifyDirectory(directory);
+	yaffs_VerifyObjectInDirectory(obj);
+}
+
+yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
+				     const YCHAR *name)
+{
+	int sum;
+
+	struct ylist_head *i;
+	YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
+
+	yaffs_Object *l;
+
+	if (!name)
+		return NULL;
+
+	if (!directory) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: yaffs_FindObjectByName: null pointer directory"
+		    TENDSTR)));
+		YBUG();
+		return NULL;
+	}
+	if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
+		YBUG();
+	}
+
+	sum = yaffs_CalcNameSum(name);
+
+	ylist_for_each(i, &directory->variant.directoryVariant.children) {
+		if (i) {
+			l = ylist_entry(i, yaffs_Object, siblings);
+
+			if (l->parent != directory)
+				YBUG();
+
+			yaffs_CheckObjectDetailsLoaded(l);
+
+			/* Special case for lost-n-found */
+			if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
+				if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
+					return l;
+			} else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
+				/* LostnFound chunk called Objxxx
+				 * Do a real check
+				 */
+				yaffs_GetObjectName(l, buffer,
+						    YAFFS_MAX_NAME_LENGTH + 1);
+				if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
+					return l;
+			}
+		}
+	}
+
+	return NULL;
+}
+
+
+#if 0
+int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
+					int (*fn) (yaffs_Object *))
+{
+	struct ylist_head *i;
+	yaffs_Object *l;
+
+	if (!theDir) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: yaffs_FindObjectByName: null pointer directory"
+		    TENDSTR)));
+		YBUG();
+		return YAFFS_FAIL;
+	}
+	if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
+		YBUG();
+		return YAFFS_FAIL;
+	}
+
+	ylist_for_each(i, &theDir->variant.directoryVariant.children) {
+		if (i) {
+			l = ylist_entry(i, yaffs_Object, siblings);
+			if (l && !fn(l))
+				return YAFFS_FAIL;
+		}
+	}
+
+	return YAFFS_OK;
+
+}
+#endif
+
+/* GetEquivalentObject dereferences any hard links to get to the
+ * actual object.
+ */
+
+yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
+{
+	if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
+		/* We want the object id of the equivalent object, not this one */
+		obj = obj->variant.hardLinkVariant.equivalentObject;
+		yaffs_CheckObjectDetailsLoaded(obj);
+	}
+	return obj;
+}
+
+int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
+{
+	memset(name, 0, buffSize * sizeof(YCHAR));
+
+	yaffs_CheckObjectDetailsLoaded(obj);
+
+	if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
+		yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
+	} else if (obj->hdrChunk <= 0) {
+		YCHAR locName[20];
+		YCHAR numString[20];
+		YCHAR *x = &numString[19];
+		unsigned v = obj->objectId;
+		numString[19] = 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_strncpy(name, locName, buffSize - 1);
+
+	}
+#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
+	else if (obj->shortName[0])
+		yaffs_strncpy(name, obj->shortName,YAFFS_SHORT_NAME_LENGTH+1);
+#endif
+	else {
+		int result;
+		__u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
+
+		yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
+
+		memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
+
+		if (obj->hdrChunk > 0) {
+			result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
+							obj->hdrChunk, buffer,
+							NULL);
+		}
+		yaffs_strncpy(name, oh->name, buffSize - 1);
+		name[buffSize-1]=0;
+
+		yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
+	}
+
+	return yaffs_strnlen(name,buffSize-1);
+}
+
+int yaffs_GetObjectFileLength(yaffs_Object *obj)
+{
+	/* Dereference any hard linking */
+	obj = yaffs_GetEquivalentObject(obj);
+
+	if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
+		return obj->variant.fileVariant.fileSize;
+	if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
+		if(!obj->variant.symLinkVariant.alias)
+			return 0;
+		return yaffs_strnlen(obj->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
+	} else {
+		/* Only a directory should drop through to here */
+		return obj->myDev->nDataBytesPerChunk;
+	}
+}
+
+int yaffs_GetObjectLinkCount(yaffs_Object *obj)
+{
+	int count = 0;
+	struct ylist_head *i;
+
+	if (!obj->unlinked)
+		count++;		/* the object itself */
+
+	ylist_for_each(i, &obj->hardLinks)
+		count++;		/* add the hard links; */
+
+	return count;
+}
+
+int yaffs_GetObjectInode(yaffs_Object *obj)
+{
+	obj = yaffs_GetEquivalentObject(obj);
+
+	return obj->objectId;
+}
+
+unsigned yaffs_GetObjectType(yaffs_Object *obj)
+{
+	obj = yaffs_GetEquivalentObject(obj);
+
+	switch (obj->variantType) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		return DT_REG;
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		return DT_DIR;
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		return DT_LNK;
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		return DT_REG;
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		if (S_ISFIFO(obj->yst_mode))
+			return DT_FIFO;
+		if (S_ISCHR(obj->yst_mode))
+			return DT_CHR;
+		if (S_ISBLK(obj->yst_mode))
+			return DT_BLK;
+		if (S_ISSOCK(obj->yst_mode))
+			return DT_SOCK;
+	default:
+		return DT_REG;
+		break;
+	}
+}
+
+YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
+{
+	obj = yaffs_GetEquivalentObject(obj);
+	if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
+		return yaffs_CloneString(obj->variant.symLinkVariant.alias);
+	else
+		return yaffs_CloneString(_Y(""));
+}
+
+#ifndef CONFIG_YAFFS_WINCE
+
+int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
+{
+	unsigned int valid = attr->ia_valid;
+
+	if (valid & ATTR_MODE)
+		obj->yst_mode = attr->ia_mode;
+	if (valid & ATTR_UID)
+		obj->yst_uid = attr->ia_uid;
+	if (valid & ATTR_GID)
+		obj->yst_gid = attr->ia_gid;
+
+	if (valid & ATTR_ATIME)
+		obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
+	if (valid & ATTR_CTIME)
+		obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
+	if (valid & ATTR_MTIME)
+		obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
+
+	if (valid & ATTR_SIZE)
+		yaffs_ResizeFile(obj, attr->ia_size);
+
+	yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
+
+	return YAFFS_OK;
+
+}
+int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
+{
+	unsigned int valid = 0;
+
+	attr->ia_mode = obj->yst_mode;
+	valid |= ATTR_MODE;
+	attr->ia_uid = obj->yst_uid;
+	valid |= ATTR_UID;
+	attr->ia_gid = obj->yst_gid;
+	valid |= ATTR_GID;
+
+	Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
+	valid |= ATTR_ATIME;
+	Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
+	valid |= ATTR_CTIME;
+	Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
+	valid |= ATTR_MTIME;
+
+	attr->ia_size = yaffs_GetFileSize(obj);
+	valid |= ATTR_SIZE;
+
+	attr->ia_valid = valid;
+
+	return YAFFS_OK;
+}
+
+#endif
+
+#if 0
+int yaffs_DumpObject(yaffs_Object *obj)
+{
+	YCHAR name[257];
+
+	yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
+
+	T(YAFFS_TRACE_ALWAYS,
+	  (TSTR
+	   ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
+	    " chunk %d type %d size %d\n"
+	    TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
+	   obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
+	   yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
+
+	return YAFFS_OK;
+}
+#endif
+
+/*---------------------------- Initialisation code -------------------------------------- */
+
+static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
+{
+
+	/* Common functions, gotta have */
+	if (!dev->param.eraseBlockInNAND || !dev->param.initialiseNAND)
+		return 0;
+
+#ifdef CONFIG_YAFFS_YAFFS2
+
+	/* Can use the "with tags" style interface for yaffs1 or yaffs2 */
+	if (dev->param.writeChunkWithTagsToNAND &&
+	    dev->param.readChunkWithTagsFromNAND &&
+	    !dev->param.writeChunkToNAND &&
+	    !dev->param.readChunkFromNAND &&
+	    dev->param.markNANDBlockBad &&
+	    dev->param.queryNANDBlock)
+		return 1;
+#endif
+
+	/* Can use the "spare" style interface for yaffs1 */
+	if (!dev->param.isYaffs2 &&
+	    !dev->param.writeChunkWithTagsToNAND &&
+	    !dev->param.readChunkWithTagsFromNAND &&
+	    dev->param.writeChunkToNAND &&
+	    dev->param.readChunkFromNAND &&
+	    !dev->param.markNANDBlockBad &&
+	    !dev->param.queryNANDBlock)
+		return 1;
+
+	return 0;	/* bad */
+}
+
+
+static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
+{
+	/* Initialise the unlinked, deleted, root and lost and found directories */
+
+	dev->lostNFoundDir = dev->rootDir =  NULL;
+	dev->unlinkedDir = dev->deletedDir = NULL;
+
+	dev->unlinkedDir =
+	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
+
+	dev->deletedDir =
+	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
+
+	dev->rootDir =
+	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
+				      YAFFS_ROOT_MODE | S_IFDIR);
+	dev->lostNFoundDir =
+	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
+				      YAFFS_LOSTNFOUND_MODE | S_IFDIR);
+
+	if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
+		yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
+		return YAFFS_OK;
+	}
+
+	return YAFFS_FAIL;
+}
+
+int yaffs_GutsInitialise(yaffs_Device *dev)
+{
+	int init_failed = 0;
+	unsigned x;
+	int bits;
+
+	T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
+
+	/* Check stuff that must be set */
+
+	if (!dev) {
+		T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	dev->internalStartBlock = dev->param.startBlock;
+	dev->internalEndBlock = dev->param.endBlock;
+	dev->blockOffset = 0;
+	dev->chunkOffset = 0;
+	dev->nFreeChunks = 0;
+
+	dev->gcBlock = -1;
+
+	if (dev->param.startBlock == 0) {
+		dev->internalStartBlock = dev->param.startBlock + 1;
+		dev->internalEndBlock = dev->param.endBlock + 1;
+		dev->blockOffset = 1;
+		dev->chunkOffset = dev->param.nChunksPerBlock;
+	}
+
+	/* Check geometry parameters. */
+
+	if ((!dev->param.inbandTags && dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 1024) ||
+	    (!dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 512) ||
+	    (dev->param.inbandTags && !dev->param.isYaffs2) ||
+	     dev->param.nChunksPerBlock < 2 ||
+	     dev->param.nReservedBlocks < 2 ||
+	     dev->internalStartBlock <= 0 ||
+	     dev->internalEndBlock <= 0 ||
+	     dev->internalEndBlock <= (dev->internalStartBlock + dev->param.nReservedBlocks + 2)) {	/* otherwise it is too small */
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
+		    TENDSTR), dev->param.totalBytesPerChunk, dev->param.isYaffs2 ? "2" : "", dev->param.inbandTags));
+		return YAFFS_FAIL;
+	}
+
+	if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	/* Sort out space for inband tags, if required */
+	if (dev->param.inbandTags)
+		dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
+	else
+		dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk;
+
+	/* Got the right mix of functions? */
+	if (!yaffs_CheckDevFunctions(dev)) {
+		/* Function missing */
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
+
+		return YAFFS_FAIL;
+	}
+
+	/* This is really a compilation check. */
+	if (!yaffs_CheckStructures()) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	if (dev->isMounted) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("yaffs: device already mounted\n" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	/* Finished with most checks. One or two more checks happen later on too. */
+
+	dev->isMounted = 1;
+
+	/* OK now calculate a few things for the device */
+
+	/*
+	 *  Calculate all the chunk size manipulation numbers:
+	 */
+	x = dev->nDataBytesPerChunk;
+	/* We always use dev->chunkShift and dev->chunkDiv */
+	dev->chunkShift = Shifts(x);
+	x >>= dev->chunkShift;
+	dev->chunkDiv = x;
+	/* We only use chunk mask if chunkDiv is 1 */
+	dev->chunkMask = (1<<dev->chunkShift) - 1;
+
+	/*
+	 * Calculate chunkGroupBits.
+	 * We need to find the next power of 2 > than internalEndBlock
+	 */
+
+	x = dev->param.nChunksPerBlock * (dev->internalEndBlock + 1);
+
+	bits = ShiftsGE(x);
+
+	/* Set up tnode width if wide tnodes are enabled. */
+	if (!dev->param.wideTnodesDisabled) {
+		/* bits must be even so that we end up with 32-bit words */
+		if (bits & 1)
+			bits++;
+		if (bits < 16)
+			dev->tnodeWidth = 16;
+		else
+			dev->tnodeWidth = bits;
+	} else
+		dev->tnodeWidth = 16;
+
+	dev->tnodeMask = (1<<dev->tnodeWidth)-1;
+
+	/* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
+	 * so if the bitwidth of the
+	 * chunk range we're using is greater than 16 we need
+	 * to figure out chunk shift and chunkGroupSize
+	 */
+
+	if (bits <= dev->tnodeWidth)
+		dev->chunkGroupBits = 0;
+	else
+		dev->chunkGroupBits = bits - dev->tnodeWidth;
+
+
+	dev->chunkGroupSize = 1 << dev->chunkGroupBits;
+
+	if (dev->param.nChunksPerBlock < dev->chunkGroupSize) {
+		/* We have a problem because the soft delete won't work if
+		 * the chunk group size > chunks per block.
+		 * This can be remedied by using larger "virtual blocks".
+		 */
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("yaffs: chunk group too large\n" TENDSTR)));
+
+		return YAFFS_FAIL;
+	}
+
+	/* OK, we've finished verifying the device, lets continue with initialisation */
+
+	/* More device initialisation */
+	dev->garbageCollections = 0;
+	dev->passiveGarbageCollections = 0;
+	dev->currentDirtyChecker = 0;
+	dev->bufferedBlock = -1;
+	dev->doingBufferedBlockRewrite = 0;
+	dev->nDeletedFiles = 0;
+	dev->nBackgroundDeletions = 0;
+	dev->nUnlinkedFiles = 0;
+	dev->eccFixed = 0;
+	dev->eccUnfixed = 0;
+	dev->tagsEccFixed = 0;
+	dev->tagsEccUnfixed = 0;
+	dev->nErasureFailures = 0;
+	dev->nErasedBlocks = 0;
+	dev->isDoingGC = 0;
+	dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
+	YINIT_LIST_HEAD(&dev->dirtyDirectories);
+	dev->oldestDirtySequence = 0;
+
+	/* Initialise temporary buffers and caches. */
+	if (!yaffs_InitialiseTempBuffers(dev))
+		init_failed = 1;
+
+	dev->srCache = NULL;
+	dev->gcCleanupList = NULL;
+
+
+	if (!init_failed &&
+	    dev->param.nShortOpCaches > 0) {
+		int i;
+		void *buf;
+		int srCacheBytes = dev->param.nShortOpCaches * sizeof(yaffs_ChunkCache);
+
+		if (dev->param.nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
+			dev->param.nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
+
+		dev->srCache =  YMALLOC(srCacheBytes);
+
+		buf = (__u8 *) dev->srCache;
+
+		if (dev->srCache)
+			memset(dev->srCache, 0, srCacheBytes);
+
+		for (i = 0; i < dev->param.nShortOpCaches && buf; i++) {
+			dev->srCache[i].object = NULL;
+			dev->srCache[i].lastUse = 0;
+			dev->srCache[i].dirty = 0;
+			dev->srCache[i].data = buf = YMALLOC_DMA(dev->param.totalBytesPerChunk);
+		}
+		if (!buf)
+			init_failed = 1;
+
+		dev->srLastUse = 0;
+	}
+
+	dev->cacheHits = 0;
+
+	if (!init_failed) {
+		dev->gcCleanupList = YMALLOC(dev->param.nChunksPerBlock * sizeof(__u32));
+		if (!dev->gcCleanupList)
+			init_failed = 1;
+	}
+
+	if (dev->param.isYaffs2)
+		dev->param.useHeaderFileSize = 1;
+
+	if (!init_failed && !yaffs_InitialiseBlocks(dev))
+		init_failed = 1;
+
+	yaffs_InitialiseTnodes(dev);
+	yaffs_InitialiseObjects(dev);
+
+	if (!init_failed && !yaffs_CreateInitialDirectories(dev))
+		init_failed = 1;
+
+
+	if (!init_failed) {
+		/* Now scan the flash. */
+		if (dev->param.isYaffs2) {
+			if (yaffs_CheckpointRestore(dev)) {
+				yaffs_CheckObjectDetailsLoaded(dev->rootDir);
+				T(YAFFS_TRACE_ALWAYS,
+				  (TSTR("yaffs: restored from checkpoint" TENDSTR)));
+			} else {
+
+				/* Clean up the mess caused by an aborted checkpoint load
+				 * and scan backwards.
+				 */
+				yaffs_DeinitialiseBlocks(dev);
+				yaffs_DeinitialiseTnodes(dev);
+				yaffs_DeinitialiseObjects(dev);
+
+
+				dev->nErasedBlocks = 0;
+				dev->nFreeChunks = 0;
+				dev->allocationBlock = -1;
+				dev->allocationPage = -1;
+				dev->nDeletedFiles = 0;
+				dev->nUnlinkedFiles = 0;
+				dev->nBackgroundDeletions = 0;
+
+				if (!init_failed && !yaffs_InitialiseBlocks(dev))
+					init_failed = 1;
+
+				yaffs_InitialiseTnodes(dev);
+				yaffs_InitialiseObjects(dev);
+
+				if (!init_failed && !yaffs_CreateInitialDirectories(dev))
+					init_failed = 1;
+
+				if (!init_failed && !yaffs_ScanBackwards(dev))
+					init_failed = 1;
+			}
+		} else if (!yaffs_Scan(dev))
+				init_failed = 1;
+
+		yaffs_StripDeletedObjects(dev);
+		yaffs_FixHangingObjects(dev);
+		if(dev->param.emptyLostAndFound)
+			yaffs_EmptyLostAndFound(dev);
+	}
+
+	if (init_failed) {
+		/* Clean up the mess */
+		T(YAFFS_TRACE_TRACING,
+		  (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
+
+		yaffs_Deinitialise(dev);
+		return YAFFS_FAIL;
+	}
+
+	/* Zero out stats */
+	dev->nPageReads = 0;
+	dev->nPageWrites = 0;
+	dev->nBlockErasures = 0;
+	dev->nGCCopies = 0;
+	dev->nRetriedWrites = 0;
+
+	dev->nRetiredBlocks = 0;
+
+	yaffs_VerifyFreeChunks(dev);
+	yaffs_VerifyBlocks(dev);
+
+	/* Clean up any aborted checkpoint data */
+	if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
+		yaffs_InvalidateCheckpoint(dev);
+
+	T(YAFFS_TRACE_TRACING,
+	  (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
+	return YAFFS_OK;
+
+}
+
+void yaffs_Deinitialise(yaffs_Device *dev)
+{
+	if (dev->isMounted) {
+		int i;
+
+		yaffs_DeinitialiseBlocks(dev);
+		yaffs_DeinitialiseTnodes(dev);
+		yaffs_DeinitialiseObjects(dev);
+		if (dev->param.nShortOpCaches > 0 &&
+		    dev->srCache) {
+
+			for (i = 0; i < dev->param.nShortOpCaches; i++) {
+				if (dev->srCache[i].data)
+					YFREE(dev->srCache[i].data);
+				dev->srCache[i].data = NULL;
+			}
+
+			YFREE(dev->srCache);
+			dev->srCache = NULL;
+		}
+
+		YFREE(dev->gcCleanupList);
+
+		for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+			YFREE(dev->tempBuffer[i].buffer);
+
+		dev->isMounted = 0;
+
+		if (dev->param.deinitialiseNAND)
+			dev->param.deinitialiseNAND(dev);
+	}
+}
+
+static int yaffs_CountFreeChunks(yaffs_Device *dev)
+{
+	int nFree=0;
+	int b;
+
+	yaffs_BlockInfo *blk;
+
+	blk = dev->blockInfo;
+	for (b = dev->internalStartBlock; b <= dev->internalEndBlock; b++) {
+		switch (blk->blockState) {
+		case YAFFS_BLOCK_STATE_EMPTY:
+		case YAFFS_BLOCK_STATE_ALLOCATING:
+		case YAFFS_BLOCK_STATE_COLLECTING:
+		case YAFFS_BLOCK_STATE_FULL:
+			nFree +=
+			    (dev->param.nChunksPerBlock - blk->pagesInUse +
+			     blk->softDeletions);
+			break;
+		default:
+			break;
+		}
+		blk++;
+	}
+
+	return nFree;
+}
+
+int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
+{
+	/* This is what we report to the outside world */
+
+	int nFree;
+	int nDirtyCacheChunks;
+	int blocksForCheckpoint;
+	int i;
+
+#if 1
+	nFree = dev->nFreeChunks;
+#else
+	nFree = yaffs_CountFreeChunks(dev);
+#endif
+
+	nFree += dev->nDeletedFiles;
+
+	/* Now count the number of dirty chunks in the cache and subtract those */
+
+	for (nDirtyCacheChunks = 0, i = 0; i < dev->param.nShortOpCaches; i++) {
+		if (dev->srCache[i].dirty)
+			nDirtyCacheChunks++;
+	}
+
+	nFree -= nDirtyCacheChunks;
+
+	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;
+
+	nFree -= (blocksForCheckpoint * dev->param.nChunksPerBlock);
+
+	if (nFree < 0)
+		nFree = 0;
+
+	return nFree;
+
+}
+
+static int yaffs_freeVerificationFailures;
+
+static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
+{
+	int counted;
+	int difference;
+
+	if (yaffs_SkipVerification(dev))
+		return;
+
+	counted = yaffs_CountFreeChunks(dev);
+
+	difference = dev->nFreeChunks - counted;
+
+	if (difference) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
+		   dev->nFreeChunks, counted, difference));
+		yaffs_freeVerificationFailures++;
+	}
+}
+
+/*---------------------------------------- YAFFS test code ----------------------*/
+
+#define yaffs_CheckStruct(structure, syze, name) \
+	do { \
+		if (sizeof(structure) != syze) { \
+			T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
+				name, syze, (int) sizeof(structure))); \
+			return YAFFS_FAIL; \
+		} \
+	} while (0)
+
+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
+	return YAFFS_OK;
+}
