dissect yaffs patch

SVN-Revision: 9249

1 files changed, 7469 insertions, 0 deletions

diff --git a/target/linux/generic-2.6/files/fs/yaffs2/yaffs_guts.c b/target/linux/generic-2.6/files/fs/yaffs2/yaffs_guts.c
new file mode 100644
index 0000000000..d32b28e5bb
--- /dev/null
+++ b/target/linux/generic-2.6/files/fs/yaffs2/yaffs_guts.c
@@ -0,0 +1,7469 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2007 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+const char *yaffs_guts_c_version =
+    "$Id$";
+
+#include "yportenv.h"
+
+#include "yaffsinterface.h"
+#include "yaffs_guts.h"
+#include "yaffs_tagsvalidity.h"
+
+#include "yaffs_tagscompat.h"
+#ifndef  CONFIG_YAFFS_USE_OWN_SORT
+#include "yaffs_qsort.h"
+#endif
+#include "yaffs_nand.h"
+
+#include "yaffs_checkptrw.h"
+
+#include "yaffs_nand.h"
+#include "yaffs_packedtags2.h"
+
+
+#ifdef CONFIG_YAFFS_WINCE
+void yfsd_LockYAFFS(BOOL fsLockOnly);
+void yfsd_UnlockYAFFS(BOOL fsLockOnly);
+#endif
+
+#define YAFFS_PASSIVE_GC_CHUNKS 2
+
+#include "yaffs_ecc.h"
+
+
+/* Robustification (if it ever comes about...) */
+static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND);
+static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk);
+static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
+				     const __u8 * data,
+				     const yaffs_ExtendedTags * tags);
+static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
+				    const yaffs_ExtendedTags * tags);
+
+/* Other local prototypes */
+static int yaffs_UnlinkObject( yaffs_Object *obj);
+static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
+
+static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
+
+static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device * dev,
+					     const __u8 * buffer,
+					     yaffs_ExtendedTags * tags,
+					     int useReserve);
+static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
+				  int chunkInNAND, int inScan);
+
+static yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
+					   yaffs_ObjectType type);
+static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
+				       yaffs_Object * obj);
+static int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name,
+				    int force, int isShrink, int shadows);
+static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj);
+static int yaffs_CheckStructures(void);
+static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
+			      int chunkOffset, int *limit);
+static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
+
+static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
+
+static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo);
+static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
+				    int lineNo);
+
+static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
+				  int chunkInNAND);
+
+static int yaffs_UnlinkWorker(yaffs_Object * obj);
+static void yaffs_DestroyObject(yaffs_Object * obj);
+
+static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
+			   int chunkInObject);
+
+loff_t yaffs_GetFileSize(yaffs_Object * obj);
+
+static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr);
+
+static void yaffs_VerifyFreeChunks(yaffs_Device * dev);
+
+static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
+
+#ifdef YAFFS_PARANOID
+static int yaffs_CheckFileSanity(yaffs_Object * in);
+#else
+#define yaffs_CheckFileSanity(in)
+#endif
+
+static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in);
+static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId);
+
+static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
+
+static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
+				 yaffs_ExtendedTags * tags);
+
+static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos);
+static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
+					  yaffs_FileStructure * fStruct,
+					  __u32 chunkId);
+
+
+/* Function to calculate chunk and offset */
+
+static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, __u32 *chunk, __u32 *offset)
+{
+	if(dev->chunkShift){
+		/* Easy-peasy power of 2 case */
+		*chunk  = (__u32)(addr >> dev->chunkShift);
+		*offset = (__u32)(addr & dev->chunkMask);
+	}
+	else if(dev->crumbsPerChunk)
+	{
+		/* Case where we're using "crumbs" */
+		*offset = (__u32)(addr & dev->crumbMask);
+		addr >>= dev->crumbShift;
+		*chunk = ((__u32)addr)/dev->crumbsPerChunk;
+		*offset += ((addr - (*chunk * dev->crumbsPerChunk)) << dev->crumbShift);
+	}
+	else
+		YBUG();
+}
+
+/* Function to return the number of shifts for a power of 2 greater than or equal 
+ * to the given number
+ * Note we don't try to cater for all possible numbers and this does not have to
+ * be hellishly efficient.
+ */
+ 
+static __u32 ShiftsGE(__u32 x)
+{
+	int extraBits;
+	int nShifts;
+	
+	nShifts = extraBits = 0;
+	
+	while(x>1){
+		if(x & 1) extraBits++;
+		x>>=1;
+		nShifts++;
+	}
+
+	if(extraBits) 
+		nShifts++;
+		
+	return nShifts;
+}
+
+/* Function to return the number of shifts to get a 1 in bit 0
+ */
+ 
+static __u32 ShiftDiv(__u32 x)
+{
+	int nShifts;
+	
+	nShifts =  0;
+	
+	if(!x) return 0;
+	
+	while( !(x&1)){
+		x>>=1;
+		nShifts++;
+	}
+		
+	return nShifts;
+}
+
+
+
+/* 
+ * Temporary buffer manipulations.
+ */
+
+static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)	
+{
+	int i;
+	__u8 *buf = (__u8 *)1;
+		
+	memset(dev->tempBuffer,0,sizeof(dev->tempBuffer));
+		
+	for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
+		dev->tempBuffer[i].line = 0;	/* not in use */
+		dev->tempBuffer[i].buffer = buf =
+		    YMALLOC_DMA(dev->nDataBytesPerChunk);
+	}
+		
+	return buf ? YAFFS_OK : YAFFS_FAIL;
+	
+}
+
+static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
+{
+	int i, j;
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+		if (dev->tempBuffer[i].line == 0) {
+			dev->tempBuffer[i].line = lineNo;
+			if ((i + 1) > dev->maxTemp) {
+				dev->maxTemp = i + 1;
+				for (j = 0; j <= i; j++)
+					dev->tempBuffer[j].maxLine =
+					    dev->tempBuffer[j].line;
+			}
+
+			return dev->tempBuffer[i].buffer;
+		}
+	}
+
+	T(YAFFS_TRACE_BUFFERS,
+	  (TSTR("Out of temp buffers at line %d, other held by lines:"),
+	   lineNo));
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+		T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
+	}
+	T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
+
+	/*
+	 * If we got here then we have to allocate an unmanaged one
+	 * This is not good.
+	 */
+
+	dev->unmanagedTempAllocations++;
+	return YMALLOC(dev->nDataBytesPerChunk);
+
+}
+
+static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
+				    int lineNo)
+{
+	int i;
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+		if (dev->tempBuffer[i].buffer == buffer) {
+			dev->tempBuffer[i].line = 0;
+			return;
+		}
+	}
+
+	if (buffer) {
+		/* assume it is an unmanaged one. */
+		T(YAFFS_TRACE_BUFFERS,
+		  (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
+		   lineNo));
+		YFREE(buffer);
+		dev->unmanagedTempDeallocations++;
+	}
+
+}
+
+/*
+ * Determine if we have a managed buffer.
+ */
+int yaffs_IsManagedTempBuffer(yaffs_Device * dev, const __u8 * buffer)
+{
+	int i;
+	for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+		if (dev->tempBuffer[i].buffer == buffer)
+			return 1;
+
+	}
+
+    for (i = 0; i < dev->nShortOpCaches; i++) {
+        if( dev->srCache[i].data == buffer )
+            return 1;
+
+    }
+
+    if (buffer == dev->checkpointBuffer)
+      return 1;
+
+    T(YAFFS_TRACE_ALWAYS,
+	  (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
+    return 0;
+}
+
+
+
+/*
+ * Chunk bitmap manipulations
+ */
+
+static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
+{
+	if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
+		T(YAFFS_TRACE_ERROR,
+		  (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
+		   blk));
+		YBUG();
+	}
+	return dev->chunkBits +
+	    (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
+}
+
+static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
+{
+	if(blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
+	   chunk < 0 || chunk >= dev->nChunksPerBlock) {
+	   T(YAFFS_TRACE_ERROR,
+	    (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),blk,chunk));
+	    YBUG();
+	}
+}
+
+static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+
+	memset(blkBits, 0, dev->chunkBitmapStride);
+}
+
+static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+
+	yaffs_VerifyChunkBitId(dev,blk,chunk);
+
+	blkBits[chunk / 8] &= ~(1 << (chunk & 7));
+}
+
+static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+	
+	yaffs_VerifyChunkBitId(dev,blk,chunk);
+
+	blkBits[chunk / 8] |= (1 << (chunk & 7));
+}
+
+static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+	yaffs_VerifyChunkBitId(dev,blk,chunk);
+
+	return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
+}
+
+static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+	int i;
+	for (i = 0; i < dev->chunkBitmapStride; i++) {
+		if (*blkBits)
+			return 1;
+		blkBits++;
+	}
+	return 0;
+}
+
+static int yaffs_CountChunkBits(yaffs_Device * dev, int blk)
+{
+	__u8 *blkBits = yaffs_BlockBits(dev, blk);
+	int i;
+	int n = 0;
+	for (i = 0; i < dev->chunkBitmapStride; i++) {
+		__u8 x = *blkBits;
+		while(x){
+			if(x & 1)
+				n++;
+			x >>=1;
+		}
+			
+		blkBits++;
+	}
+	return n;
+}
+
+/* 
+ * Verification code
+ */
+ 
+static int yaffs_SkipVerification(yaffs_Device *dev)
+{
+	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_SkipFullVerification(yaffs_Device *dev)
+{
+	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_SkipNANDVerification(yaffs_Device *dev)
+{
+	return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
+}
+
+static const char * blockStateName[] = {
+"Unknown",
+"Needs scanning",
+"Scanning",
+"Empty",
+"Allocating",
+"Full",
+"Dirty",
+"Checkpoint",
+"Collecting",
+"Dead"
+};
+
+static void yaffs_VerifyBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
+{
+	int actuallyUsed;
+	int inUse;
+	
+	if(yaffs_SkipVerification(dev))
+		return;
+		
+	/* Report illegal runtime states */
+	if(bi->blockState <0 || bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
+		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has undefined state %d"TENDSTR),n,bi->blockState));
+		
+	switch(bi->blockState){
+	 case YAFFS_BLOCK_STATE_UNKNOWN:
+	 case YAFFS_BLOCK_STATE_SCANNING:
+	 case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
+		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has bad run-state %s"TENDSTR),
+		n,blockStateName[bi->blockState]));
+	}
+	
+	/* Check pages in use and soft deletions are legal */
+	
+	actuallyUsed = bi->pagesInUse - bi->softDeletions;
+	
+	if(bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
+	   bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
+	   actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
+		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
+		n,bi->pagesInUse,bi->softDeletions));
+	
+		
+	/* Check chunk bitmap legal */
+	inUse = yaffs_CountChunkBits(dev,n);
+	if(inUse != bi->pagesInUse)
+		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
+			n,bi->pagesInUse,inUse));
+	
+	/* Check that the sequence number is valid.
+	 * Ten million is legal, but is very unlikely 
+	 */
+	if(dev->isYaffs2 && 
+	   (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
+	   (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000 ))
+		T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has suspect sequence number of %d"TENDSTR),
+		n,bi->sequenceNumber));
+		
+}
+
+static void yaffs_VerifyCollectedBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
+{
+	yaffs_VerifyBlock(dev,bi,n);
+	
+	/* After collection the block should be in the erased state */
+	/* TODO: This will need to change if we do partial gc */
+	
+	if(bi->blockState != YAFFS_BLOCK_STATE_EMPTY){
+		T(YAFFS_TRACE_ERROR,(TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
+			n,bi->blockState));
+	}
+}
+
+static void yaffs_VerifyBlocks(yaffs_Device *dev)
+{
+	int i;
+	int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
+	int nIllegalBlockStates = 0;
+	
+
+	if(yaffs_SkipVerification(dev))
+		return;
+
+	memset(nBlocksPerState,0,sizeof(nBlocksPerState));
+
+		
+	for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++){
+		yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
+		yaffs_VerifyBlock(dev,bi,i);
+
+		if(bi->blockState >=0 && bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
+			nBlocksPerState[bi->blockState]++;
+		else
+			nIllegalBlockStates++;
+					
+	}
+	
+	T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
+	T(YAFFS_TRACE_VERIFY,(TSTR("Block summary"TENDSTR)));
+	
+	T(YAFFS_TRACE_VERIFY,(TSTR("%d blocks have illegal states"TENDSTR),nIllegalBlockStates));
+	if(nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
+		T(YAFFS_TRACE_VERIFY,(TSTR("Too many allocating blocks"TENDSTR)));
+
+	for(i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
+		T(YAFFS_TRACE_VERIFY,
+		  (TSTR("%s %d blocks"TENDSTR),
+		  blockStateName[i],nBlocksPerState[i]));
+	
+	if(dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
+		T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
+		 dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
+		 
+	if(dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
+		T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
+		 dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
+		 
+	if(nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
+		T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
+		 nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
+
+	T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
+
+}
+
+/*
+ * Verify the object header. oh must be valid, but obj and tags may be NULL in which
+ * case those tests will not be performed.
+ */
+static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
+{
+	if(yaffs_SkipVerification(obj->myDev))
+		return;
+		
+	if(!(tags && obj && oh)){
+	 	T(YAFFS_TRACE_VERIFY,
+		 		(TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
+		 		(__u32)tags,(__u32)obj,(__u32)oh));
+		return;
+	}
+	
+	if(oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
+	   oh->type > YAFFS_OBJECT_TYPE_MAX)
+	 	T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
+		 tags->objectId, oh->type));
+
+	if(tags->objectId != obj->objectId)
+	 	T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
+		 tags->objectId, obj->objectId));
+
+
+	/*
+	 * Check that the object's parent ids match if parentCheck requested.
+	 * 
+	 * Tests do not apply to the root object.
+	 */
+	
+	if(parentCheck && tags->objectId > 1 && !obj->parent)
+	 	T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
+	 	 tags->objectId, oh->parentObjectId));
+		
+	
+	if(parentCheck && obj->parent &&
+	   oh->parentObjectId != obj->parent->objectId && 
+	   (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
+	    obj->parent->objectId != YAFFS_OBJECTID_DELETED))
+	 	T(YAFFS_TRACE_VERIFY,
+		 (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
+	 	 tags->objectId, oh->parentObjectId, obj->parent->objectId));
+		
+	
+	if(tags->objectId > 1 && oh->name[0] == 0) /* Null name */
+		T(YAFFS_TRACE_VERIFY,
+		(TSTR("Obj %d header name is NULL"TENDSTR),
+		 obj->objectId));
+
+	if(tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
+		T(YAFFS_TRACE_VERIFY,
+		(TSTR("Obj %d header name is 0xFF"TENDSTR),
+		 obj->objectId));
+}
+
+
+
+static int yaffs_VerifyTnodeWorker(yaffs_Object * obj, yaffs_Tnode * tn,
+				  	__u32 level, int chunkOffset)
+{
+	int i;
+	yaffs_Device *dev = obj->myDev;
+	int ok = 1;
+	int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
+
+	if (tn) {
+		if (level > 0) {
+
+			for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
+				if (tn->internal[i]) {
+					ok = yaffs_VerifyTnodeWorker(obj,
+							tn->internal[i],
+							level - 1,
+							(chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
+				}
+			}
+		} else if (level == 0) {
+			int i;
+			yaffs_ExtendedTags tags;
+			__u32 objectId = obj->objectId;
+			
+			chunkOffset <<=  YAFFS_TNODES_LEVEL0_BITS;
+			
+			for(i = 0; i < YAFFS_NTNODES_LEVEL0; i++){
+				__u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
+				
+				if(theChunk > 0){
+					/* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
+					yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
+					if(tags.objectId != objectId || tags.chunkId != chunkOffset){
+						T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
+							objectId, chunkOffset, theChunk,
+							tags.objectId, tags.chunkId));
+					}
+				}
+				chunkOffset++;
+			}
+		}
+	}
+
+	return ok;
+
+}
+
+
+static void yaffs_VerifyFile(yaffs_Object *obj)
+{
+	int requiredTallness;
+	int actualTallness;
+	__u32 lastChunk;
+	__u32 x;
+	__u32 i;
+	int ok;
+	yaffs_Device *dev;
+	yaffs_ExtendedTags tags;
+	yaffs_Tnode *tn;
+	__u32 objectId;
+	
+	if(obj && yaffs_SkipVerification(obj->myDev))
+		return;
+	
+	dev = obj->myDev;
+	objectId = obj->objectId;
+	
+	/* Check file size is consistent with tnode depth */
+	lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
+	x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
+	requiredTallness = 0;
+	while (x> 0) {
+		x >>= YAFFS_TNODES_INTERNAL_BITS;
+		requiredTallness++;
+	}
+	
+	actualTallness = obj->variant.fileVariant.topLevel;
+	
+	if(requiredTallness > actualTallness )
+		T(YAFFS_TRACE_VERIFY,
+		(TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
+		 obj->objectId,actualTallness, requiredTallness));
+	
+	
+	/* Check that the chunks in the tnode tree are all correct. 
+	 * We do this by scanning through the tnode tree and
+	 * checking the tags for every chunk match.
+	 */
+
+	if(yaffs_SkipNANDVerification(dev))
+		return;
+		
+	for(i = 1; i <= lastChunk; i++){
+		tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant,i);
+
+		if (tn) {
+			__u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
+			if(theChunk > 0){
+				/* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
+				yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
+				if(tags.objectId != objectId || tags.chunkId != i){
+					T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
+						objectId, i, theChunk,
+						tags.objectId, tags.chunkId));
+				}
+			}
+		}
+
+	}
+
+}
+
+static void yaffs_VerifyDirectory(yaffs_Object *obj)
+{
+	if(obj && yaffs_SkipVerification(obj->myDev))
+		return;
+	
+}
+
+static void yaffs_VerifyHardLink(yaffs_Object *obj)
+{
+	if(obj && yaffs_SkipVerification(obj->myDev))
+		return;
+		
+	/* Verify sane equivalent object */
+}
+
+static void yaffs_VerifySymlink(yaffs_Object *obj)
+{
+	if(obj && yaffs_SkipVerification(obj->myDev))
+		return;
+		
+	/* Verify symlink string */
+}
+
+static void yaffs_VerifySpecial(yaffs_Object *obj)
+{
+	if(obj && yaffs_SkipVerification(obj->myDev))
+		return;
+}
+
+static void yaffs_VerifyObject(yaffs_Object *obj)
+{
+	yaffs_Device *dev;
+	
+	__u32 chunkMin;
+	__u32 chunkMax;
+	
+	__u32 chunkIdOk;
+	__u32 chunkIsLive;
+	
+	if(!obj)
+		return;
+	
+	dev = obj->myDev;
+	
+	if(yaffs_SkipVerification(dev))
+		return;
+		
+	/* Check sane object header chunk */
+	
+	chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
+	chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
+	
+	chunkIdOk = (obj->chunkId >= chunkMin && obj->chunkId <= chunkMax);
+	chunkIsLive = chunkIdOk && 
+			yaffs_CheckChunkBit(dev, 
+					    obj->chunkId / dev->nChunksPerBlock,
+					    obj->chunkId % dev->nChunksPerBlock);
+	if(!obj->fake && 
+	    (!chunkIdOk || !chunkIsLive)) {
+	   T(YAFFS_TRACE_VERIFY,
+	   (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
+	   obj->objectId,obj->chunkId,
+	   chunkIdOk ? "" : ",out of range",
+	   chunkIsLive || !chunkIdOk ? "" : ",marked as deleted"));
+	}
+	
+	if(chunkIdOk && chunkIsLive &&!yaffs_SkipNANDVerification(dev)) {
+		yaffs_ExtendedTags tags;
+		yaffs_ObjectHeader *oh;
+		__u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
+		
+		oh = (yaffs_ObjectHeader *)buffer;
+		
+		yaffs_ReadChunkWithTagsFromNAND(dev, obj->chunkId,buffer, &tags);
+		
+		yaffs_VerifyObjectHeader(obj,oh,&tags,1);
+		
+		yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
+	}
+	
+	/* Verify it has a parent */
+	if(obj && !obj->fake &&
+	   (!obj->parent || obj->parent->myDev != dev)){
+	   T(YAFFS_TRACE_VERIFY,
+	   (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
+	   obj->objectId,obj->parent));	   
+	}
+	
+	/* Verify parent is a directory */
+	if(obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY){
+	   T(YAFFS_TRACE_VERIFY,
+	   (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
+	   obj->objectId,obj->parent->variantType));	   
+	}
+	
+	switch(obj->variantType){
+	case YAFFS_OBJECT_TYPE_FILE:
+		yaffs_VerifyFile(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		yaffs_VerifySymlink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		yaffs_VerifyDirectory(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		yaffs_VerifyHardLink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		yaffs_VerifySpecial(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+	default:
+		T(YAFFS_TRACE_VERIFY,
+		(TSTR("Obj %d has illegaltype %d"TENDSTR),
+		obj->objectId,obj->variantType));	   
+		break;
+	}
+	
+	
+}
+
+static void yaffs_VerifyObjects(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	int i;
+	struct list_head *lh;
+
+	if(yaffs_SkipVerification(dev))
+		return;
+	
+	/* Iterate through the objects in each hash entry */
+	 
+	 for(i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++){
+	 	list_for_each(lh, &dev->objectBucket[i].list) {
+			if (lh) {
+				obj = list_entry(lh, yaffs_Object, hashLink);
+				yaffs_VerifyObject(obj);
+			}
+		}
+	 }
+
+}
+
+
+/*
+ *  Simple hash function. Needs to have a reasonable spread
+ */
+ 
+static Y_INLINE int yaffs_HashFunction(int n)
+{
+	n = abs(n);
+	return (n % YAFFS_NOBJECT_BUCKETS);
+}
+
+/*
+ * Access functions to useful fake objects
+ */
+ 
+yaffs_Object *yaffs_Root(yaffs_Device * dev)
+{
+	return dev->rootDir;
+}
+
+yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
+{
+	return dev->lostNFoundDir;
+}
+
+
+/*
+ *  Erased NAND checking functions
+ */
+ 
+int yaffs_CheckFF(__u8 * buffer, int nBytes)
+{
+	/* Horrible, slow implementation */
+	while (nBytes--) {
+		if (*buffer != 0xFF)
+			return 0;
+		buffer++;
+	}
+	return 1;
+}
+
+static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
+				  int chunkInNAND)
+{
+
+	int retval = YAFFS_OK;
+	__u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
+	yaffs_ExtendedTags tags;
+	int result;
+
+	result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
+	
+	if(tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
+		retval = YAFFS_FAIL;
+		
+
+	if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
+		T(YAFFS_TRACE_NANDACCESS,
+		  (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
+		retval = YAFFS_FAIL;
+	}
+
+	yaffs_ReleaseTempBuffer(dev, data, __LINE__);
+
+	return retval;
+
+}
+
+
+static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
+					     const __u8 * data,
+					     yaffs_ExtendedTags * tags,
+					     int useReserve)
+{
+	int attempts = 0;
+	int writeOk = 0;
+	int chunk;
+
+	yaffs_InvalidateCheckpoint(dev);
+
+	do {
+		yaffs_BlockInfo *bi = 0;
+		int erasedOk = 0;
+
+		chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
+		if (chunk < 0) {
+			/* no space */
+			break;
+		}
+
+		/* First check this chunk is erased, if it needs
+		 * checking.  The checking policy (unless forced
+		 * always on) is as follows:
+		 *
+		 * Check the first page we try to write in a block.
+		 * If the check passes then we don't need to check any
+		 * more.	If the check fails, we check again...
+		 * If the block has been erased, we don't need to check.
+		 *
+		 * However, if the block has been prioritised for gc,
+		 * then we think there might be something odd about
+		 * this block and stop using it.
+		 *
+		 * Rationale: We should only ever see chunks that have
+		 * not been erased if there was a partially written
+		 * chunk due to power loss.  This checking policy should
+		 * catch that case with very few checks and thus save a
+		 * lot of checks that are most likely not needed.
+		 */
+		if (bi->gcPrioritise) {
+			yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
+			/* try another chunk */
+			continue;
+		}
+
+		/* let's give it a try */
+		attempts++;
+
+#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
+		bi->skipErasedCheck = 0;
+#endif
+		if (!bi->skipErasedCheck) {
+			erasedOk = yaffs_CheckChunkErased(dev, chunk);
+			if (erasedOk != YAFFS_OK) {
+				T(YAFFS_TRACE_ERROR,
+				(TSTR ("**>> yaffs chunk %d was not erased"
+				TENDSTR), chunk));
+
+				/* try another chunk */
+				continue;
+			}
+			bi->skipErasedCheck = 1;
+		}
+
+		writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
+				data, tags);
+		if (writeOk != YAFFS_OK) {
+			yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
+			/* try another chunk */
+			continue;
+		}
+
+		/* Copy the data into the robustification buffer */
+		yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
+
+	} while (writeOk != YAFFS_OK && attempts < yaffs_wr_attempts);
+
+	if (attempts > 1) {
+		T(YAFFS_TRACE_ERROR,
+			(TSTR("**>> yaffs write required %d attempts" TENDSTR),
+			attempts));
+
+		dev->nRetriedWrites += (attempts - 1);
+	}
+
+	return chunk;
+}
+
+/*
+ * Block retiring for handling a broken block.
+ */
+ 
+static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
+{
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
+
+	yaffs_InvalidateCheckpoint(dev);
+	
+	yaffs_MarkBlockBad(dev, blockInNAND);
+
+	bi->blockState = YAFFS_BLOCK_STATE_DEAD;
+	bi->gcPrioritise = 0;
+	bi->needsRetiring = 0;
+
+	dev->nRetiredBlocks++;
+}
+
+/*
+ * Functions for robustisizing TODO
+ *
+ */
+ 
+static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
+				     const __u8 * data,
+				     const yaffs_ExtendedTags * tags)
+{
+}
+
+static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
+				    const yaffs_ExtendedTags * tags)
+{
+}
+
+void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
+{
+	if(!bi->gcPrioritise){
+		bi->gcPrioritise = 1;
+		dev->hasPendingPrioritisedGCs = 1;
+		bi->chunkErrorStrikes ++;
+		
+		if(bi->chunkErrorStrikes > 3){
+			bi->needsRetiring = 1; /* Too many stikes, so retire this */
+			T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
+
+		}
+		
+	}
+}
+
+static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk)
+{
+
+	int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
+
+	yaffs_HandleChunkError(dev,bi);
+		
+	
+	if(erasedOk ) {
+		/* Was an actual write failure, so mark the block for retirement  */
+		bi->needsRetiring = 1;
+		T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+		  (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
+
+		
+	}
+	
+	/* Delete the chunk */
+	yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
+}
+
+
+/*---------------- Name handling functions ------------*/ 
+
+static __u16 yaffs_CalcNameSum(const YCHAR * name)
+{
+	__u16 sum = 0;
+	__u16 i = 1;
+
+	YUCHAR *bname = (YUCHAR *) name;
+	if (bname) {
+		while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+			sum += yaffs_toupper(*bname) * i;
+#else
+			sum += (*bname) * i;
+#endif
+			i++;
+			bname++;
+		}
+	}
+	return sum;
+}
+
+static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
+{
+#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
+	if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
+		yaffs_strcpy(obj->shortName, name);
+	} else {
+		obj->shortName[0] = _Y('\0');
+	}
+#endif
+	obj->sum = yaffs_CalcNameSum(name);
+}
+
+/*-------------------- TNODES -------------------
+
+ * List of spare tnodes
+ * The list is hooked together using the first pointer
+ * in the tnode.
+ */
+ 
+/* yaffs_CreateTnodes creates a bunch more tnodes and
+ * adds them to the tnode free list.
+ * Don't use this function directly
+ */
+
+static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
+{
+	int i;
+	int tnodeSize;
+	yaffs_Tnode *newTnodes;
+	__u8 *mem;
+	yaffs_Tnode *curr;
+	yaffs_Tnode *next;
+	yaffs_TnodeList *tnl;
+
+	if (nTnodes < 1)
+		return YAFFS_OK;
+		
+	/* Calculate the tnode size in bytes for variable width tnode support.
+	 * Must be a multiple of 32-bits  */
+	tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
+
+	/* make these things */
+
+	newTnodes = YMALLOC(nTnodes * tnodeSize);
+	mem = (__u8 *)newTnodes;
+
+	if (!newTnodes) {
+		T(YAFFS_TRACE_ERROR,
+		  (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	/* Hook them into the free list */
+#if 0
+	for (i = 0; i < nTnodes - 1; i++) {
+		newTnodes[i].internal[0] = &newTnodes[i + 1];
+#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
+		newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
+#endif
+	}
+
+	newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
+#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
+	newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
+#endif
+	dev->freeTnodes = newTnodes;
+#else
+	/* New hookup for wide tnodes */
+	for(i = 0; i < nTnodes -1; i++) {
+		curr = (yaffs_Tnode *) &mem[i * tnodeSize];
+		next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
+		curr->internal[0] = next;
+	}
+	
+	curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
+	curr->internal[0] = dev->freeTnodes;
+	dev->freeTnodes = (yaffs_Tnode *)mem;
+
+#endif
+
+
+	dev->nFreeTnodes += nTnodes;
+	dev->nTnodesCreated += nTnodes;
+
+	/* Now add this bunch of tnodes to a list for freeing up.
+	 * NB If we can't add this to the management list it isn't fatal
+	 * but it just means we can't free this bunch of tnodes later.
+	 */
+	 
+	tnl = YMALLOC(sizeof(yaffs_TnodeList));
+	if (!tnl) {
+		T(YAFFS_TRACE_ERROR,
+		  (TSTR
+		   ("yaffs: Could not add tnodes to management list" TENDSTR)));
+		   return YAFFS_FAIL;
+
+	} else {
+		tnl->tnodes = newTnodes;
+		tnl->next = dev->allocatedTnodeList;
+		dev->allocatedTnodeList = tnl;
+	}
+
+	T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
+
+	return YAFFS_OK;
+}
+
+/* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
+
+static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
+{
+	yaffs_Tnode *tn = NULL;
+
+	/* If there are none left make more */
+	if (!dev->freeTnodes) {
+		yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
+	}
+
+	if (dev->freeTnodes) {
+		tn = dev->freeTnodes;
+#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
+		if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
+			/* Hoosterman, this thing looks like it isn't in the list */
+			T(YAFFS_TRACE_ALWAYS,
+			  (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
+		}
+#endif
+		dev->freeTnodes = dev->freeTnodes->internal[0];
+		dev->nFreeTnodes--;
+	}
+
+	return tn;
+}
+
+static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
+{
+	yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
+	
+	if(tn)
+		memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
+
+	return tn;	
+}
+
+/* FreeTnode frees up a tnode and puts it back on the free list */
+static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
+{
+	if (tn) {
+#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
+		if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
+			/* Hoosterman, this thing looks like it is already in the list */
+			T(YAFFS_TRACE_ALWAYS,
+			  (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
+		}
+		tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
+#endif
+		tn->internal[0] = dev->freeTnodes;
+		dev->freeTnodes = tn;
+		dev->nFreeTnodes++;
+	}
+}
+
+static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
+{
+	/* Free the list of allocated tnodes */
+	yaffs_TnodeList *tmp;
+
+	while (dev->allocatedTnodeList) {
+		tmp = dev->allocatedTnodeList->next;
+
+		YFREE(dev->allocatedTnodeList->tnodes);
+		YFREE(dev->allocatedTnodeList);
+		dev->allocatedTnodeList = tmp;
+
+	}
+
+	dev->freeTnodes = NULL;
+	dev->nFreeTnodes = 0;
+}
+
+static void yaffs_InitialiseTnodes(yaffs_Device * dev)
+{
+	dev->allocatedTnodeList = NULL;
+	dev->freeTnodes = NULL;
+	dev->nFreeTnodes = 0;
+	dev->nTnodesCreated = 0;
+
+}
+
+
+void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
+{
+  __u32 *map = (__u32 *)tn;
+  __u32 bitInMap;
+  __u32 bitInWord;
+  __u32 wordInMap;
+  __u32 mask;
+  
+  pos &= YAFFS_TNODES_LEVEL0_MASK;
+  val >>= dev->chunkGroupBits;
+  
+  bitInMap = pos * dev->tnodeWidth;
+  wordInMap = bitInMap /32;
+  bitInWord = bitInMap & (32 -1);
+  
+  mask = dev->tnodeMask << bitInWord;
+  
+  map[wordInMap] &= ~mask;
+  map[wordInMap] |= (mask & (val << bitInWord));
+  
+  if(dev->tnodeWidth > (32-bitInWord)) {
+    bitInWord = (32 - bitInWord);
+    wordInMap++;;
+    mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
+    map[wordInMap] &= ~mask;
+    map[wordInMap] |= (mask & (val >> bitInWord));
+  }
+}
+
+static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
+{
+  __u32 *map = (__u32 *)tn;
+  __u32 bitInMap;
+  __u32 bitInWord;
+  __u32 wordInMap;
+  __u32 val;
+  
+  pos &= YAFFS_TNODES_LEVEL0_MASK;
+  
+  bitInMap = pos * dev->tnodeWidth;
+  wordInMap = bitInMap /32;
+  bitInWord = bitInMap & (32 -1);
+  
+  val = map[wordInMap] >> bitInWord;
+  
+  if(dev->tnodeWidth > (32-bitInWord)) {
+    bitInWord = (32 - bitInWord);
+    wordInMap++;;
+    val |= (map[wordInMap] << bitInWord);
+  }
+  
+  val &= dev->tnodeMask;
+  val <<= dev->chunkGroupBits;
+  
+  return val;
+}
+
+/* ------------------- End of individual tnode manipulation -----------------*/
+
+/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
+ * The look up tree is represented by the top tnode and the number of topLevel
+ * in the tree. 0 means only the level 0 tnode is in the tree.
+ */
+
+/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
+static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
+					  yaffs_FileStructure * fStruct,
+					  __u32 chunkId)
+{
+
+	yaffs_Tnode *tn = fStruct->top;
+	__u32 i;
+	int requiredTallness;
+	int level = fStruct->topLevel;
+
+	/* Check sane level and chunk Id */
+	if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
+		return NULL;
+	}
+
+	if (chunkId > YAFFS_MAX_CHUNK_ID) {
+		return NULL;
+	}
+
+	/* First check we're tall enough (ie enough topLevel) */
+
+	i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
+	requiredTallness = 0;
+	while (i) {
+		i >>= YAFFS_TNODES_INTERNAL_BITS;
+		requiredTallness++;
+	}
+
+	if (requiredTallness > fStruct->topLevel) {
+		/* Not tall enough, so we can't find it, return NULL. */
+		return NULL;
+	}
+
+	/* Traverse down to level 0 */
+	while (level > 0 && tn) {
+		tn = tn->
+		    internal[(chunkId >>
+			       ( YAFFS_TNODES_LEVEL0_BITS + 
+			         (level - 1) *
+			         YAFFS_TNODES_INTERNAL_BITS)
+			      ) &
+			     YAFFS_TNODES_INTERNAL_MASK];
+		level--;
+
+	}
+
+	return tn;
+}
+
+/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
+ * This happens in two steps:
+ *  1. If the tree isn't tall enough, then make it taller.
+ *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
+ *
+ * Used when modifying the tree.
+ *
+ *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
+ *  be plugged into the ttree.
+ */
+ 
+static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
+					       yaffs_FileStructure * fStruct,
+					       __u32 chunkId,
+					       yaffs_Tnode *passedTn)
+{
+
+	int requiredTallness;
+	int i;
+	int l;
+	yaffs_Tnode *tn;
+
+	__u32 x;
+
+
+	/* Check sane level and page Id */
+	if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
+		return NULL;
+	}
+
+	if (chunkId > YAFFS_MAX_CHUNK_ID) {
+		return NULL;
+	}
+
+	/* First check we're tall enough (ie enough topLevel) */
+
+	x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
+	requiredTallness = 0;
+	while (x) {
+		x >>= YAFFS_TNODES_INTERNAL_BITS;
+		requiredTallness++;
+	}
+
+
+	if (requiredTallness > fStruct->topLevel) {
+		/* Not tall enough,gotta make the tree taller */
+		for (i = fStruct->topLevel; i < requiredTallness; i++) {
+		
+			tn = yaffs_GetTnode(dev);
+
+			if (tn) {
+				tn->internal[0] = fStruct->top;
+				fStruct->top = tn;
+			} else {
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR("yaffs: no more tnodes" TENDSTR)));
+			}
+		}
+
+		fStruct->topLevel = requiredTallness;
+	}
+
+	/* Traverse down to level 0, adding anything we need */
+
+	l = fStruct->topLevel;
+	tn = fStruct->top;
+	
+	if(l > 0) {
+		while (l > 0 && tn) {
+			x = (chunkId >>
+			     ( YAFFS_TNODES_LEVEL0_BITS +
+			      (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
+			    YAFFS_TNODES_INTERNAL_MASK;
+
+
+			if((l>1) && !tn->internal[x]){
+				/* Add missing non-level-zero tnode */
+				tn->internal[x] = yaffs_GetTnode(dev);
+
+			} else if(l == 1) {
+				/* Looking from level 1 at level 0 */
+			 	if (passedTn) {
+					/* If we already have one, then release it.*/
+					if(tn->internal[x])
+						yaffs_FreeTnode(dev,tn->internal[x]);
+					tn->internal[x] = passedTn;
+			
+				} else if(!tn->internal[x]) {
+					/* Don't have one, none passed in */
+					tn->internal[x] = yaffs_GetTnode(dev);
+				}
+			}
+		
+			tn = tn->internal[x];
+			l--;
+		}
+	} else {
+		/* top is level 0 */
+		if(passedTn) {
+			memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
+			yaffs_FreeTnode(dev,passedTn);
+		}
+	}
+
+	return tn;
+}
+
+static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
+				  yaffs_ExtendedTags * tags, int objectId,
+				  int chunkInInode)
+{
+	int j;
+
+	for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
+		if (yaffs_CheckChunkBit
+		    (dev, theChunk / dev->nChunksPerBlock,
+		     theChunk % dev->nChunksPerBlock)) {
+			yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
+							tags);
+			if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
+				/* found it; */
+				return theChunk;
+
+			}
+		}
+		theChunk++;
+	}
+	return -1;
+}
+
+
+/* DeleteWorker scans backwards through the tnode tree and deletes all the
+ * chunks and tnodes in the file
+ * Returns 1 if the tree was deleted. 
+ * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
+ */
+
+static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
+			      int chunkOffset, int *limit)
+{
+	int i;
+	int chunkInInode;
+	int theChunk;
+	yaffs_ExtendedTags tags;
+	int foundChunk;
+	yaffs_Device *dev = in->myDev;
+
+	int allDone = 1;
+
+	if (tn) {
+		if (level > 0) {
+
+			for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
+			     i--) {
+				if (tn->internal[i]) {
+					if (limit && (*limit) < 0) {
+						allDone = 0;
+					} else {
+						allDone =
+						    yaffs_DeleteWorker(in,
+								       tn->
+								       internal
+								       [i],
+								       level -
+								       1,
+								       (chunkOffset
+									<<
+									YAFFS_TNODES_INTERNAL_BITS)
+								       + i,
+								       limit);
+					}
+					if (allDone) {
+						yaffs_FreeTnode(dev,
+								tn->
+								internal[i]);
+						tn->internal[i] = NULL;
+					}
+				}
+
+			}
+			return (allDone) ? 1 : 0;
+		} else if (level == 0) {
+			int hitLimit = 0;
+
+			for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
+			     i--) {
+			        theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
+				if (theChunk) {
+
+					chunkInInode =
+					    (chunkOffset <<
+					     YAFFS_TNODES_LEVEL0_BITS) + i;
+
+					foundChunk =
+					    yaffs_FindChunkInGroup(dev,
+								   theChunk,
+								   &tags,
+								   in->objectId,
+								   chunkInInode);
+
+					if (foundChunk > 0) {
+						yaffs_DeleteChunk(dev,
+								  foundChunk, 1,
+								  __LINE__);
+						in->nDataChunks--;
+						if (limit) {
+							*limit = *limit - 1;
+							if (*limit <= 0) {
+								hitLimit = 1;
+							}
+						}
+
+					}
+
+					yaffs_PutLevel0Tnode(dev,tn,i,0);
+				}
+
+			}
+			return (i < 0) ? 1 : 0;
+
+		}
+
+	}
+
+	return 1;
+
+}
+
+static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
+{
+
+	yaffs_BlockInfo *theBlock;
+
+	T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
+
+	theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
+	if (theBlock) {
+		theBlock->softDeletions++;
+		dev->nFreeChunks++;
+	}
+}
+
+/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
+ * All soft deleting does is increment the block's softdelete count and pulls the chunk out
+ * of the tnode.
+ * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
+ */
+ 
+static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
+				  __u32 level, int chunkOffset)
+{
+	int i;
+	int theChunk;
+	int allDone = 1;
+	yaffs_Device *dev = in->myDev;
+
+	if (tn) {
+		if (level > 0) {
+
+			for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
+			     i--) {
+				if (tn->internal[i]) {
+					allDone =
+					    yaffs_SoftDeleteWorker(in,
+								   tn->
+								   internal[i],
+								   level - 1,
+								   (chunkOffset
+								    <<
+								    YAFFS_TNODES_INTERNAL_BITS)
+								   + i);
+					if (allDone) {
+						yaffs_FreeTnode(dev,
+								tn->
+								internal[i]);
+						tn->internal[i] = NULL;
+					} else {
+						/* Hoosterman... how could this happen? */
+					}
+				}
+			}
+			return (allDone) ? 1 : 0;
+		} else if (level == 0) {
+
+			for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
+				theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
+				if (theChunk) {
+					/* Note this does not find the real chunk, only the chunk group.
+					 * We make an assumption that a chunk group is not larger than 
+					 * a block.
+					 */
+					yaffs_SoftDeleteChunk(dev, theChunk);
+					yaffs_PutLevel0Tnode(dev,tn,i,0);
+				}
+
+			}
+			return 1;
+
+		}
+
+	}
+
+	return 1;
+
+}
+
+static void yaffs_SoftDeleteFile(yaffs_Object * obj)
+{
+	if (obj->deleted &&
+	    obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
+		if (obj->nDataChunks <= 0) {
+			/* Empty file with no duplicate object headers, just delete it immediately */
+			yaffs_FreeTnode(obj->myDev,
+					obj->variant.fileVariant.top);
+			obj->variant.fileVariant.top = NULL;
+			T(YAFFS_TRACE_TRACING,
+			  (TSTR("yaffs: Deleting empty file %d" TENDSTR),
+			   obj->objectId));
+			yaffs_DoGenericObjectDeletion(obj);
+		} else {
+			yaffs_SoftDeleteWorker(obj,
+					       obj->variant.fileVariant.top,
+					       obj->variant.fileVariant.
+					       topLevel, 0);
+			obj->softDeleted = 1;
+		}
+	}
+}
+
+/* Pruning removes any part of the file structure tree that is beyond the
+ * bounds of the file (ie that does not point to chunks).
+ *
+ * A file should only get pruned when its size is reduced.
+ *
+ * Before pruning, the chunks must be pulled from the tree and the
+ * level 0 tnode entries must be zeroed out.
+ * Could also use this for file deletion, but that's probably better handled
+ * by a special case.
+ */
+
+static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
+				      __u32 level, int del0)
+{
+	int i;
+	int hasData;
+
+	if (tn) {
+		hasData = 0;
+
+		for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
+			if (tn->internal[i] && level > 0) {
+				tn->internal[i] =
+				    yaffs_PruneWorker(dev, tn->internal[i],
+						      level - 1,
+						      (i == 0) ? del0 : 1);
+			}
+
+			if (tn->internal[i]) {
+				hasData++;
+			}
+		}
+
+		if (hasData == 0 && del0) {
+			/* Free and return NULL */
+
+			yaffs_FreeTnode(dev, tn);
+			tn = NULL;
+		}
+
+	}
+
+	return tn;
+
+}
+
+static int yaffs_PruneFileStructure(yaffs_Device * dev,
+				    yaffs_FileStructure * fStruct)
+{
+	int i;
+	int hasData;
+	int done = 0;
+	yaffs_Tnode *tn;
+
+	if (fStruct->topLevel > 0) {
+		fStruct->top =
+		    yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
+
+		/* Now we have a tree with all the non-zero branches NULL but the height
+		 * is the same as it was.
+		 * Let's see if we can trim internal tnodes to shorten the tree.
+		 * We can do this if only the 0th element in the tnode is in use 
+		 * (ie all the non-zero are NULL)
+		 */
+
+		while (fStruct->topLevel && !done) {
+			tn = fStruct->top;
+
+			hasData = 0;
+			for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
+				if (tn->internal[i]) {
+					hasData++;
+				}
+			}
+
+			if (!hasData) {
+				fStruct->top = tn->internal[0];
+				fStruct->topLevel--;
+				yaffs_FreeTnode(dev, tn);
+			} else {
+				done = 1;
+			}
+		}
+	}
+
+	return YAFFS_OK;
+}
+
+/*-------------------- End of File Structure functions.-------------------*/
+
+/* yaffs_CreateFreeObjects creates a bunch more objects and
+ * adds them to the object free list.
+ */
+static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
+{
+	int i;
+	yaffs_Object *newObjects;
+	yaffs_ObjectList *list;
+
+	if (nObjects < 1)
+		return YAFFS_OK;
+
+	/* make these things */
+	newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
+	list = YMALLOC(sizeof(yaffs_ObjectList));
+
+	if (!newObjects || !list) {
+		if(newObjects)
+			YFREE(newObjects);
+		if(list)
+			YFREE(list);
+		T(YAFFS_TRACE_ALLOCATE,
+		  (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+	
+	/* Hook them into the free list */
+	for (i = 0; i < nObjects - 1; i++) {
+		newObjects[i].siblings.next =
+		    (struct list_head *)(&newObjects[i + 1]);
+	}
+
+	newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
+	dev->freeObjects = newObjects;
+	dev->nFreeObjects += nObjects;
+	dev->nObjectsCreated += nObjects;
+
+	/* Now add this bunch of Objects to a list for freeing up. */
+
+	list->objects = newObjects;
+	list->next = dev->allocatedObjectList;
+	dev->allocatedObjectList = list;
+
+	return YAFFS_OK;
+}
+
+
+/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
+static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
+{
+	yaffs_Object *tn = NULL;
+
+	/* If there are none left make more */
+	if (!dev->freeObjects) {
+		yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
+	}
+
+	if (dev->freeObjects) {
+		tn = dev->freeObjects;
+		dev->freeObjects =
+		    (yaffs_Object *) (dev->freeObjects->siblings.next);
+		dev->nFreeObjects--;
+
+		/* Now sweeten it up... */
+
+		memset(tn, 0, sizeof(yaffs_Object));
+		tn->myDev = dev;
+		tn->chunkId = -1;
+		tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
+		INIT_LIST_HEAD(&(tn->hardLinks));
+		INIT_LIST_HEAD(&(tn->hashLink));
+		INIT_LIST_HEAD(&tn->siblings);
+
+		/* Add it to the lost and found directory.
+		 * NB Can't put root or lostNFound in lostNFound so
+		 * check if lostNFound exists first
+		 */
+		if (dev->lostNFoundDir) {
+			yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
+		}
+	}
+
+	return tn;
+}
+
+static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
+					       __u32 mode)
+{
+
+	yaffs_Object *obj =
+	    yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
+	if (obj) {
+		obj->fake = 1;		/* it is fake so it has no NAND presence... */
+		obj->renameAllowed = 0;	/* ... and we're not allowed to rename it... */
+		obj->unlinkAllowed = 0;	/* ... or unlink it */
+		obj->deleted = 0;
+		obj->unlinked = 0;
+		obj->yst_mode = mode;
+		obj->myDev = dev;
+		obj->chunkId = 0;	/* Not a valid chunk. */
+	}
+
+	return obj;
+
+}
+
+static void yaffs_UnhashObject(yaffs_Object * tn)
+{
+	int bucket;
+	yaffs_Device *dev = tn->myDev;
+
+	/* If it is still linked into the bucket list, free from the list */
+	if (!list_empty(&tn->hashLink)) {
+		list_del_init(&tn->hashLink);
+		bucket = yaffs_HashFunction(tn->objectId);
+		dev->objectBucket[bucket].count--;
+	}
+
+}
+
+/*  FreeObject frees up a Object and puts it back on the free list */
+static void yaffs_FreeObject(yaffs_Object * tn)
+{
+
+	yaffs_Device *dev = tn->myDev;
+
+#ifdef  __KERNEL__
+	if (tn->myInode) {
+		/* We're still hooked up to a cached inode.
+		 * Don't delete now, but mark for later deletion
+		 */
+		tn->deferedFree = 1;
+		return;
+	}
+#endif
+
+	yaffs_UnhashObject(tn);
+
+	/* Link into the free list. */
+	tn->siblings.next = (struct list_head *)(dev->freeObjects);
+	dev->freeObjects = tn;
+	dev->nFreeObjects++;
+}
+
+#ifdef __KERNEL__
+
+void yaffs_HandleDeferedFree(yaffs_Object * obj)
+{
+	if (obj->deferedFree) {
+		yaffs_FreeObject(obj);
+	}
+}
+
+#endif
+
+static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
+{
+	/* Free the list of allocated Objects */
+
+	yaffs_ObjectList *tmp;
+
+	while (dev->allocatedObjectList) {
+		tmp = dev->allocatedObjectList->next;
+		YFREE(dev->allocatedObjectList->objects);
+		YFREE(dev->allocatedObjectList);
+
+		dev->allocatedObjectList = tmp;
+	}
+
+	dev->freeObjects = NULL;
+	dev->nFreeObjects = 0;
+}
+
+static void yaffs_InitialiseObjects(yaffs_Device * dev)
+{
+	int i;
+
+	dev->allocatedObjectList = NULL;
+	dev->freeObjects = NULL;
+	dev->nFreeObjects = 0;
+
+	for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+		INIT_LIST_HEAD(&dev->objectBucket[i].list);
+		dev->objectBucket[i].count = 0;
+	}
+
+}
+
+static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
+{
+	static int x = 0;
+	int i;
+	int l = 999;
+	int lowest = 999999;
+
+	/* First let's see if we can find one that's empty. */
+
+	for (i = 0; i < 10 && lowest > 0; i++) {
+		x++;
+		x %= YAFFS_NOBJECT_BUCKETS;
+		if (dev->objectBucket[x].count < lowest) {
+			lowest = dev->objectBucket[x].count;
+			l = x;
+		}
+
+	}
+
+	/* If we didn't find an empty list, then try
+	 * looking a bit further for a short one
+	 */
+
+	for (i = 0; i < 10 && lowest > 3; i++) {
+		x++;
+		x %= YAFFS_NOBJECT_BUCKETS;
+		if (dev->objectBucket[x].count < lowest) {
+			lowest = dev->objectBucket[x].count;
+			l = x;
+		}
+
+	}
+
+	return l;
+}
+
+static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
+{
+	int bucket = yaffs_FindNiceObjectBucket(dev);
+
+	/* Now find an object value that has not already been taken
+	 * by scanning the list.
+	 */
+
+	int found = 0;
+	struct list_head *i;
+
+	__u32 n = (__u32) bucket;
+
+	/* yaffs_CheckObjectHashSanity();  */
+
+	while (!found) {
+		found = 1;
+		n += YAFFS_NOBJECT_BUCKETS;
+		if (1 || dev->objectBucket[bucket].count > 0) {
+			list_for_each(i, &dev->objectBucket[bucket].list) {
+				/* If there is already one in the list */
+				if (i
+				    && list_entry(i, yaffs_Object,
+						  hashLink)->objectId == n) {
+					found = 0;
+				}
+			}
+		}
+	}
+
+
+	return n;
+}
+
+static void yaffs_HashObject(yaffs_Object * in)
+{
+	int bucket = yaffs_HashFunction(in->objectId);
+	yaffs_Device *dev = in->myDev;
+
+	list_add(&in->hashLink, &dev->objectBucket[bucket].list);
+	dev->objectBucket[bucket].count++;
+
+}
+
+yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
+{
+	int bucket = yaffs_HashFunction(number);
+	struct list_head *i;
+	yaffs_Object *in;
+
+	list_for_each(i, &dev->objectBucket[bucket].list) {
+		/* Look if it is in the list */
+		if (i) {
+			in = list_entry(i, yaffs_Object, hashLink);
+			if (in->objectId == number) {
+#ifdef __KERNEL__
+				/* Don't tell the VFS about this one if it is defered free */
+				if (in->deferedFree)
+					return NULL;
+#endif
+
+				return in;
+			}
+		}
+	}
+
+	return NULL;
+}
+
+yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
+				    yaffs_ObjectType type)
+{
+
+	yaffs_Object *theObject;
+	yaffs_Tnode *tn;
+
+	if (number < 0) {
+		number = yaffs_CreateNewObjectNumber(dev);
+	}
+
+	theObject = yaffs_AllocateEmptyObject(dev);
+	if(!theObject)
+		return NULL;
+		
+	if(type == YAFFS_OBJECT_TYPE_FILE){
+		tn = yaffs_GetTnode(dev);
+		if(!tn){
+			yaffs_FreeObject(theObject);
+			return NULL;
+		}
+	}
+		
+	
+
+	if (theObject) {
+		theObject->fake = 0;
+		theObject->renameAllowed = 1;
+		theObject->unlinkAllowed = 1;
+		theObject->objectId = number;
+		yaffs_HashObject(theObject);
+		theObject->variantType = type;
+#ifdef CONFIG_YAFFS_WINCE
+		yfsd_WinFileTimeNow(theObject->win_atime);
+		theObject->win_ctime[0] = theObject->win_mtime[0] =
+		    theObject->win_atime[0];
+		theObject->win_ctime[1] = theObject->win_mtime[1] =
+		    theObject->win_atime[1];
+
+#else
+
+		theObject->yst_atime = theObject->yst_mtime =
+		    theObject->yst_ctime = Y_CURRENT_TIME;
+#endif
+		switch (type) {
+		case YAFFS_OBJECT_TYPE_FILE:
+			theObject->variant.fileVariant.fileSize = 0;
+			theObject->variant.fileVariant.scannedFileSize = 0;
+			theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF;	/* max __u32 */
+			theObject->variant.fileVariant.topLevel = 0;
+			theObject->variant.fileVariant.top = tn;
+			break;
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+			INIT_LIST_HEAD(&theObject->variant.directoryVariant.
+				       children);
+			break;
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+			/* No action required */
+			break;
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+			/* todo this should not happen */
+			break;
+		}
+	}
+
+	return theObject;
+}
+
+static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
+						      int number,
+						      yaffs_ObjectType type)
+{
+	yaffs_Object *theObject = NULL;
+
+	if (number > 0) {
+		theObject = yaffs_FindObjectByNumber(dev, number);
+	}
+
+	if (!theObject) {
+		theObject = yaffs_CreateNewObject(dev, number, type);
+	}
+
+	return theObject;
+
+}
+			
+
+static YCHAR *yaffs_CloneString(const YCHAR * str)
+{
+	YCHAR *newStr = NULL;
+
+	if (str && *str) {
+		newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
+		if(newStr)
+			yaffs_strcpy(newStr, str);
+	}
+
+	return newStr;
+
+}
+
+/*
+ * Mknod (create) a new object.
+ * equivalentObject only has meaning for a hard link;
+ * aliasString only has meaning for a sumlink.
+ * rdev only has meaning for devices (a subset of special objects)
+ */
+ 
+static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
+				       yaffs_Object * parent,
+				       const YCHAR * name,
+				       __u32 mode,
+				       __u32 uid,
+				       __u32 gid,
+				       yaffs_Object * equivalentObject,
+				       const YCHAR * aliasString, __u32 rdev)
+{
+	yaffs_Object *in;
+	YCHAR *str;
+
+	yaffs_Device *dev = parent->myDev;
+
+	/* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
+	if (yaffs_FindObjectByName(parent, name)) {
+		return NULL;
+	}
+
+	in = yaffs_CreateNewObject(dev, -1, type);
+	
+	if(type == YAFFS_OBJECT_TYPE_SYMLINK){
+		str = yaffs_CloneString(aliasString);
+		if(!str){
+			yaffs_FreeObject(in);
+			return NULL;
+		}
+	}
+	
+	
+
+	if (in) {
+		in->chunkId = -1;
+		in->valid = 1;
+		in->variantType = type;
+
+		in->yst_mode = mode;
+
+#ifdef CONFIG_YAFFS_WINCE
+		yfsd_WinFileTimeNow(in->win_atime);
+		in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
+		in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
+
+#else
+		in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
+
+		in->yst_rdev = rdev;
+		in->yst_uid = uid;
+		in->yst_gid = gid;
+#endif
+		in->nDataChunks = 0;
+
+		yaffs_SetObjectName(in, name);
+		in->dirty = 1;
+
+		yaffs_AddObjectToDirectory(parent, in);
+
+		in->myDev = parent->myDev;
+
+		switch (type) {
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			in->variant.symLinkVariant.alias = str;
+			break;
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+			in->variant.hardLinkVariant.equivalentObject =
+			    equivalentObject;
+			in->variant.hardLinkVariant.equivalentObjectId =
+			    equivalentObject->objectId;
+			list_add(&in->hardLinks, &equivalentObject->hardLinks);
+			break;
+		case YAFFS_OBJECT_TYPE_FILE:	
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+			/* do nothing */
+			break;
+		}
+
+		if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
+			/* Could not create the object header, fail the creation */
+			yaffs_DestroyObject(in);
+			in = NULL;
+		}
+
+	}
+
+	return in;
+}
+
+yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
+			      __u32 mode, __u32 uid, __u32 gid)
+{
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
+				 uid, gid, NULL, NULL, 0);
+}
+
+yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
+				   __u32 mode, __u32 uid, __u32 gid)
+{
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
+				 mode, uid, gid, NULL, NULL, 0);
+}
+
+yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
+				 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
+{
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
+				 uid, gid, NULL, NULL, rdev);
+}
+
+yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
+				 __u32 mode, __u32 uid, __u32 gid,
+				 const YCHAR * alias)
+{
+	return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
+				 uid, gid, NULL, alias, 0);
+}
+
+/* yaffs_Link returns the object id of the equivalent object.*/
+yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
+			 yaffs_Object * equivalentObject)
+{
+	/* Get the real object in case we were fed a hard link as an equivalent object */
+	equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
+
+	if (yaffs_MknodObject
+	    (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
+	     equivalentObject, NULL, 0)) {
+		return equivalentObject;
+	} else {
+		return NULL;
+	}
+
+}
+
+static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
+				  const YCHAR * newName, int force, int shadows)
+{
+	int unlinkOp;
+	int deleteOp;
+
+	yaffs_Object *existingTarget;
+
+	if (newDir == NULL) {
+		newDir = obj->parent;	/* use the old directory */
+	}
+
+	if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
+		    TENDSTR)));
+		YBUG();
+	}
+	
+	/* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
+	if (obj->myDev->isYaffs2) {
+		unlinkOp = (newDir == obj->myDev->unlinkedDir);
+	} else {
+		unlinkOp = (newDir == obj->myDev->unlinkedDir
+			    && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
+	}
+
+	deleteOp = (newDir == obj->myDev->deletedDir);
+
+	existingTarget = yaffs_FindObjectByName(newDir, newName);
+
+	/* If the object is a file going into the unlinked directory, 
+	 *   then it is OK to just stuff it in since duplicate names are allowed.
+	 *   else only proceed if the new name does not exist and if we're putting 
+	 *   it into a directory.
+	 */
+	if ((unlinkOp ||
+	     deleteOp ||
+	     force ||
+	     (shadows > 0) ||
+	     !existingTarget) &&
+	    newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
+		yaffs_SetObjectName(obj, newName);
+		obj->dirty = 1;
+
+		yaffs_AddObjectToDirectory(newDir, obj);
+
+		if (unlinkOp)
+			obj->unlinked = 1;
+
+		/* If it is a deletion then we mark it as a shrink for gc purposes. */
+		if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
+			return YAFFS_OK;
+	}
+
+	return YAFFS_FAIL;
+}
+
+int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
+		       yaffs_Object * newDir, const YCHAR * newName)
+{
+	yaffs_Object *obj;
+	yaffs_Object *existingTarget;
+	int force = 0;
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+	/* Special case for case insemsitive systems (eg. WinCE).
+	 * While look-up is case insensitive, the name isn't.
+	 * Therefore we might want to change x.txt to X.txt
+	*/
+	if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
+		force = 1;
+	}
+#endif
+
+	obj = yaffs_FindObjectByName(oldDir, oldName);
+	/* Check new name to long. */
+	if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK &&
+	    yaffs_strlen(newName) > YAFFS_MAX_ALIAS_LENGTH)
+	  /* ENAMETOOLONG */
+	  return YAFFS_FAIL;
+	else if (obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK &&
+		 yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
+	  /* ENAMETOOLONG */
+	  return YAFFS_FAIL;
+
+	if (obj && obj->renameAllowed) {
+
+		/* Now do the handling for an existing target, if there is one */
+
+		existingTarget = yaffs_FindObjectByName(newDir, newName);
+		if (existingTarget &&
+		    existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
+		    !list_empty(&existingTarget->variant.directoryVariant.children)) {
+			/* There is a target that is a non-empty directory, so we fail */
+			return YAFFS_FAIL;	/* EEXIST or ENOTEMPTY */
+		} else if (existingTarget && existingTarget != obj) {
+			/* Nuke the target first, using shadowing, 
+			 * but only if it isn't the same object
+			 */
+			yaffs_ChangeObjectName(obj, newDir, newName, force,
+					       existingTarget->objectId);
+			yaffs_UnlinkObject(existingTarget);
+		}
+
+		return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
+	}
+	return YAFFS_FAIL;
+}
+
+/*------------------------- Block Management and Page Allocation ----------------*/
+
+static int yaffs_InitialiseBlocks(yaffs_Device * dev)
+{
+	int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+	
+	dev->blockInfo = NULL;
+	dev->chunkBits = NULL;
+	
+	dev->allocationBlock = -1;	/* force it to get a new one */
+
+	/* If the first allocation strategy fails, thry the alternate one */
+	dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
+	if(!dev->blockInfo){
+		dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
+		dev->blockInfoAlt = 1;
+	}
+	else
+		dev->blockInfoAlt = 0;
+		
+	if(dev->blockInfo){
+	
+		/* Set up dynamic blockinfo stuff. */
+		dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
+		dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
+		if(!dev->chunkBits){
+			dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
+			dev->chunkBitsAlt = 1;
+		}
+		else
+			dev->chunkBitsAlt = 0;
+	}
+	
+	if (dev->blockInfo && dev->chunkBits) {
+		memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
+		memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
+		return YAFFS_OK;
+	}
+
+	return YAFFS_FAIL;
+
+}
+
+static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
+{
+	if(dev->blockInfoAlt && dev->blockInfo)
+		YFREE_ALT(dev->blockInfo);
+	else if(dev->blockInfo)
+		YFREE(dev->blockInfo);
+
+	dev->blockInfoAlt = 0;
+
+	dev->blockInfo = NULL;
+	
+	if(dev->chunkBitsAlt && dev->chunkBits)
+		YFREE_ALT(dev->chunkBits);
+	else if(dev->chunkBits)
+		YFREE(dev->chunkBits);
+	dev->chunkBitsAlt = 0;
+	dev->chunkBits = NULL;
+}
+
+static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
+					    yaffs_BlockInfo * bi)
+{
+	int i;
+	__u32 seq;
+	yaffs_BlockInfo *b;
+
+	if (!dev->isYaffs2)
+		return 1;	/* disqualification only applies to yaffs2. */
+
+	if (!bi->hasShrinkHeader)
+		return 1;	/* can gc */
+
+	/* Find the oldest dirty sequence number if we don't know it and save it
+	 * so we don't have to keep recomputing it.
+	 */
+	if (!dev->oldestDirtySequence) {
+		seq = dev->sequenceNumber;
+
+		for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
+		     i++) {
+			b = yaffs_GetBlockInfo(dev, i);
+			if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
+			    (b->pagesInUse - b->softDeletions) <
+			    dev->nChunksPerBlock && b->sequenceNumber < seq) {
+				seq = b->sequenceNumber;
+			}
+		}
+		dev->oldestDirtySequence = seq;
+	}
+
+	/* Can't do gc of this block if there are any blocks older than this one that have
+	 * discarded pages.
+	 */
+	return (bi->sequenceNumber <= dev->oldestDirtySequence);
+
+}
+
+/* FindDiretiestBlock is used to select the dirtiest block (or close enough)
+ * for garbage collection.
+ */
+
+static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
+					       int aggressive)
+{
+
+	int b = dev->currentDirtyChecker;
+
+	int i;
+	int iterations;
+	int dirtiest = -1;
+	int pagesInUse = 0;
+	int prioritised=0;
+	yaffs_BlockInfo *bi;
+	int pendingPrioritisedExist = 0;
+	
+	/* First let's see if we need to grab a prioritised block */
+	if(dev->hasPendingPrioritisedGCs){
+		for(i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++){
+
+			bi = yaffs_GetBlockInfo(dev, i);
+			//yaffs_VerifyBlock(dev,bi,i);
+			
+			if(bi->gcPrioritise) {
+				pendingPrioritisedExist = 1;
+				if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
+				   yaffs_BlockNotDisqualifiedFromGC(dev, bi)){
+					pagesInUse = (bi->pagesInUse - bi->softDeletions);
+					dirtiest = i;
+					prioritised = 1;
+					aggressive = 1; /* Fool the non-aggressive skip logiv below */
+				}
+			}
+		}
+		
+		if(!pendingPrioritisedExist) /* None found, so we can clear this */
+			dev->hasPendingPrioritisedGCs = 0;
+	}
+
+	/* If we're doing aggressive GC then we are happy to take a less-dirty block, and
+	 * search harder.
+	 * else (we're doing a leasurely gc), then we only bother to do this if the
+	 * block has only a few pages in use.
+	 */
+
+	dev->nonAggressiveSkip--;
+
+	if (!aggressive && (dev->nonAggressiveSkip > 0)) {
+		return -1;
+	}
+
+	if(!prioritised)
+		pagesInUse =
+	    		(aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
+
+	if (aggressive) {
+		iterations =
+		    dev->internalEndBlock - dev->internalStartBlock + 1;
+	} else {
+		iterations =
+		    dev->internalEndBlock - dev->internalStartBlock + 1;
+		iterations = iterations / 16;
+		if (iterations > 200) {
+			iterations = 200;
+		}
+	}
+
+	for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
+		b++;
+		if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
+			b = dev->internalStartBlock;
+		}
+
+		if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
+			T(YAFFS_TRACE_ERROR,
+			  (TSTR("**>> Block %d is not valid" TENDSTR), b));
+			YBUG();
+		}
+
+		bi = yaffs_GetBlockInfo(dev, b);
+
+#if 0
+		if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
+			dirtiest = b;
+			pagesInUse = 0;
+		}
+		else 
+#endif
+
+		if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
+		       (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
+		        yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
+			dirtiest = b;
+			pagesInUse = (bi->pagesInUse - bi->softDeletions);
+		}
+	}
+
+	dev->currentDirtyChecker = b;
+
+	if (dirtiest > 0) {
+		T(YAFFS_TRACE_GC,
+		  (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
+		   dev->nChunksPerBlock - pagesInUse,prioritised));
+	}
+
+	dev->oldestDirtySequence = 0;
+
+	if (dirtiest > 0) {
+		dev->nonAggressiveSkip = 4;
+	}
+
+	return dirtiest;
+}
+
+static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
+{
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
+
+	int erasedOk = 0;
+
+	/* If the block is still healthy erase it and mark as clean.
+	 * If the block has had a data failure, then retire it.
+	 */
+	 
+	T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
+		(TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
+		blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
+		
+	bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
+
+	if (!bi->needsRetiring) {
+		yaffs_InvalidateCheckpoint(dev);
+		erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
+		if (!erasedOk) {
+			dev->nErasureFailures++;
+			T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+			  (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
+		}
+	}
+
+	if (erasedOk && 
+	    ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
+		int i;
+		for (i = 0; i < dev->nChunksPerBlock; i++) {
+			if (!yaffs_CheckChunkErased
+			    (dev, blockNo * dev->nChunksPerBlock + i)) {
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   (">>Block %d erasure supposedly OK, but chunk %d not erased"
+				    TENDSTR), blockNo, i));
+			}
+		}
+	}
+
+	if (erasedOk) {
+		/* Clean it up... */
+		bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
+		dev->nErasedBlocks++;
+		bi->pagesInUse = 0;
+		bi->softDeletions = 0;
+		bi->hasShrinkHeader = 0;
+		bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
+		bi->gcPrioritise = 0;
+		yaffs_ClearChunkBits(dev, blockNo);
+
+		T(YAFFS_TRACE_ERASE,
+		  (TSTR("Erased block %d" TENDSTR), blockNo));
+	} else {
+		dev->nFreeChunks -= dev->nChunksPerBlock;	/* We lost a block of free space */
+
+		yaffs_RetireBlock(dev, blockNo);
+		T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+		  (TSTR("**>> Block %d retired" TENDSTR), blockNo));
+	}
+}
+
+static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
+{
+	int i;
+
+	yaffs_BlockInfo *bi;
+
+	if (dev->nErasedBlocks < 1) {
+		/* Hoosterman we've got a problem.
+		 * Can't get space to gc
+		 */
+		T(YAFFS_TRACE_ERROR,
+		  (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
+
+		return -1;
+	}
+	
+	/* Find an empty block. */
+
+	for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
+		dev->allocationBlockFinder++;
+		if (dev->allocationBlockFinder < dev->internalStartBlock
+		    || dev->allocationBlockFinder > dev->internalEndBlock) {
+			dev->allocationBlockFinder = dev->internalStartBlock;
+		}
+
+		bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
+
+		if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
+			bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
+			dev->sequenceNumber++;
+			bi->sequenceNumber = dev->sequenceNumber;
+			dev->nErasedBlocks--;
+			T(YAFFS_TRACE_ALLOCATE,
+			  (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
+			   dev->allocationBlockFinder, dev->sequenceNumber,
+			   dev->nErasedBlocks));
+			return dev->allocationBlockFinder;
+		}
+	}
+
+	T(YAFFS_TRACE_ALWAYS,
+	  (TSTR
+	   ("yaffs tragedy: no more eraased blocks, but there should have been %d"
+	    TENDSTR), dev->nErasedBlocks));
+
+	return -1;
+}
+
+
+// Check if there's space to allocate...
+// Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
+static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
+{
+	int reservedChunks;
+	int reservedBlocks = dev->nReservedBlocks;
+	int checkpointBlocks;
+	
+	checkpointBlocks =  dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
+	if(checkpointBlocks < 0)
+		checkpointBlocks = 0;
+	
+	reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
+	
+	return (dev->nFreeChunks > reservedChunks);
+}
+
+static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr)
+{
+	int retVal;
+	yaffs_BlockInfo *bi;
+
+	if (dev->allocationBlock < 0) {
+		/* Get next block to allocate off */
+		dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
+		dev->allocationPage = 0;
+	}
+
+	if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
+		/* Not enough space to allocate unless we're allowed to use the reserve. */
+		return -1;
+	}
+
+	if (dev->nErasedBlocks < dev->nReservedBlocks
+	    && dev->allocationPage == 0) {
+		T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
+	}
+
+	/* Next page please.... */
+	if (dev->allocationBlock >= 0) {
+		bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
+
+		retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
+		    dev->allocationPage;
+		bi->pagesInUse++;
+		yaffs_SetChunkBit(dev, dev->allocationBlock,
+				  dev->allocationPage);
+
+		dev->allocationPage++;
+
+		dev->nFreeChunks--;
+
+		/* If the block is full set the state to full */
+		if (dev->allocationPage >= dev->nChunksPerBlock) {
+			bi->blockState = YAFFS_BLOCK_STATE_FULL;
+			dev->allocationBlock = -1;
+		}
+
+		if(blockUsedPtr)
+			*blockUsedPtr = bi;
+			
+		return retVal;
+	}
+	
+	T(YAFFS_TRACE_ERROR,
+	  (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
+
+	return -1;
+}
+
+static int yaffs_GetErasedChunks(yaffs_Device * dev)
+{
+	int n;
+
+	n = dev->nErasedBlocks * dev->nChunksPerBlock;
+
+	if (dev->allocationBlock > 0) {
+		n += (dev->nChunksPerBlock - dev->allocationPage);
+	}
+
+	return n;
+
+}
+
+static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
+{
+	int oldChunk;
+	int newChunk;
+	int chunkInBlock;
+	int markNAND;
+	int retVal = YAFFS_OK;
+	int cleanups = 0;
+	int i;
+	int isCheckpointBlock;
+	int matchingChunk;
+
+	int chunksBefore = yaffs_GetErasedChunks(dev);
+	int chunksAfter;
+
+	yaffs_ExtendedTags tags;
+
+	yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
+
+	yaffs_Object *object;
+
+	isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
+	
+	bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
+
+	T(YAFFS_TRACE_TRACING,
+	  (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
+	   bi->pagesInUse, bi->hasShrinkHeader));
+
+	/*yaffs_VerifyFreeChunks(dev); */
+
+	bi->hasShrinkHeader = 0;	/* clear the flag so that the block can erase */
+
+	/* Take off the number of soft deleted entries because
+	 * they're going to get really deleted during GC.
+	 */
+	dev->nFreeChunks -= bi->softDeletions;
+
+	dev->isDoingGC = 1;
+
+	if (isCheckpointBlock ||
+	    !yaffs_StillSomeChunkBits(dev, block)) {
+		T(YAFFS_TRACE_TRACING,
+		  (TSTR
+		   ("Collecting block %d that has no chunks in use" TENDSTR),
+		   block));
+		yaffs_BlockBecameDirty(dev, block);
+	} else {
+
+		__u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
+		
+		yaffs_VerifyBlock(dev,bi,block);
+
+		for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
+		     chunkInBlock < dev->nChunksPerBlock
+		     && yaffs_StillSomeChunkBits(dev, block);
+		     chunkInBlock++, oldChunk++) {
+			if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
+
+				/* This page is in use and might need to be copied off */
+
+				markNAND = 1;
+
+				yaffs_InitialiseTags(&tags);
+
+				yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
+								buffer, &tags);
+
+				object =
+				    yaffs_FindObjectByNumber(dev,
+							     tags.objectId);
+
+				T(YAFFS_TRACE_GC_DETAIL,
+				  (TSTR
+				   ("Collecting page %d, %d %d %d " TENDSTR),
+				   chunkInBlock, tags.objectId, tags.chunkId,
+				   tags.byteCount));
+				   
+				if(object && !yaffs_SkipVerification(dev)){
+					if(tags.chunkId == 0)
+						matchingChunk = object->chunkId;
+					else if(object->softDeleted)
+						matchingChunk = oldChunk; /* Defeat the test */
+					else
+						matchingChunk = yaffs_FindChunkInFile(object,tags.chunkId,NULL);
+					
+					if(oldChunk != matchingChunk)
+						T(YAFFS_TRACE_ERROR,
+						  (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
+						  oldChunk,matchingChunk,tags.objectId, tags.chunkId));
+						
+				}
+
+				if (!object) {
+					T(YAFFS_TRACE_ERROR,
+					  (TSTR
+					   ("page %d in gc has no object: %d %d %d "
+					    TENDSTR), oldChunk,
+					    tags.objectId, tags.chunkId, tags.byteCount));
+				}
+
+				if (object && object->deleted
+				    && tags.chunkId != 0) {
+					/* Data chunk in a deleted file, throw it away
+					 * It's a soft deleted data chunk,
+					 * No need to copy this, just forget about it and 
+					 * fix up the object.
+					 */
+
+					object->nDataChunks--;
+
+					if (object->nDataChunks <= 0) {
+						/* remeber to clean up the object */
+						dev->gcCleanupList[cleanups] =
+						    tags.objectId;
+						cleanups++;
+					}
+					markNAND = 0;
+				} else if (0
+					   /* Todo object && object->deleted && object->nDataChunks == 0 */
+					   ) {
+					/* Deleted object header with no data chunks.
+					 * Can be discarded and the file deleted.
+					 */
+					object->chunkId = 0;
+					yaffs_FreeTnode(object->myDev,
+							object->variant.
+							fileVariant.top);
+					object->variant.fileVariant.top = NULL;
+					yaffs_DoGenericObjectDeletion(object);
+
+				} else if (object) {
+					/* It's either a data chunk in a live file or
+					 * an ObjectHeader, so we're interested in it.
+					 * NB Need to keep the ObjectHeaders of deleted files
+					 * until the whole file has been deleted off
+					 */
+					tags.serialNumber++;
+
+					dev->nGCCopies++;
+
+					if (tags.chunkId == 0) {
+						/* It is an object Id,
+						 * We need to nuke the shrinkheader flags first
+						 * We no longer want the shrinkHeader flag since its work is done
+						 * and if it is left in place it will mess up scanning.
+						 * Also, clear out any shadowing stuff
+						 */
+
+						yaffs_ObjectHeader *oh;
+						oh = (yaffs_ObjectHeader *)buffer;
+						oh->isShrink = 0;
+						oh->shadowsObject = -1;
+						tags.extraShadows = 0;
+						tags.extraIsShrinkHeader = 0;
+						
+						yaffs_VerifyObjectHeader(object,oh,&tags,1);
+					}
+
+					newChunk =
+					    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
+
+					if (newChunk < 0) {
+						retVal = YAFFS_FAIL;
+					} else {
+
+						/* Ok, now fix up the Tnodes etc. */
+
+						if (tags.chunkId == 0) {
+							/* It's a header */
+							object->chunkId =  newChunk;
+							object->serial =   tags.serialNumber;
+						} else {
+							/* It's a data chunk */
+							yaffs_PutChunkIntoFile
+							    (object,
+							     tags.chunkId,
+							     newChunk, 0);
+						}
+					}
+				}
+
+				yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
+
+			}
+		}
+
+		yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
+
+
+		/* Do any required cleanups */
+		for (i = 0; i < cleanups; i++) {
+			/* Time to delete the file too */
+			object =
+			    yaffs_FindObjectByNumber(dev,
+						     dev->gcCleanupList[i]);
+			if (object) {
+				yaffs_FreeTnode(dev,
+						object->variant.fileVariant.
+						top);
+				object->variant.fileVariant.top = NULL;
+				T(YAFFS_TRACE_GC,
+				  (TSTR
+				   ("yaffs: About to finally delete object %d"
+				    TENDSTR), object->objectId));
+				yaffs_DoGenericObjectDeletion(object);
+				object->myDev->nDeletedFiles--;
+			}
+
+		}
+
+	}
+
+	yaffs_VerifyCollectedBlock(dev,bi,block);
+	  
+	if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
+		T(YAFFS_TRACE_GC,
+		  (TSTR
+		   ("gc did not increase free chunks before %d after %d"
+		    TENDSTR), chunksBefore, chunksAfter));
+	}
+
+	dev->isDoingGC = 0;
+
+	return YAFFS_OK;
+}
+
+/* New garbage collector
+ * If we're very low on erased blocks then we do aggressive garbage collection
+ * otherwise we do "leasurely" garbage collection.
+ * Aggressive gc looks further (whole array) and will accept less dirty blocks.
+ * Passive gc only inspects smaller areas and will only accept more dirty blocks.
+ *
+ * The idea is to help clear out space in a more spread-out manner.
+ * Dunno if it really does anything useful.
+ */
+static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
+{
+	int block;
+	int aggressive;
+	int gcOk = YAFFS_OK;
+	int maxTries = 0;
+	
+	int checkpointBlockAdjust;
+
+	if (dev->isDoingGC) {
+		/* Bail out so we don't get recursive gc */
+		return YAFFS_OK;
+	}
+	
+	/* This loop should pass the first time.
+	 * We'll only see looping here if the erase of the collected block fails.
+	 */
+
+	do {
+		maxTries++;
+		
+		checkpointBlockAdjust = (dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint);
+		if(checkpointBlockAdjust < 0)
+			checkpointBlockAdjust = 0;
+
+		if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
+			/* We need a block soon...*/
+			aggressive = 1;
+		} else {
+			/* We're in no hurry */
+			aggressive = 0;
+		}
+
+		block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
+
+		if (block > 0) {
+			dev->garbageCollections++;
+			if (!aggressive) {
+				dev->passiveGarbageCollections++;
+			}
+
+			T(YAFFS_TRACE_GC,
+			  (TSTR
+			   ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
+			   dev->nErasedBlocks, aggressive));
+
+			gcOk = yaffs_GarbageCollectBlock(dev, block);
+		}
+
+		if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
+			T(YAFFS_TRACE_GC,
+			  (TSTR
+			   ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
+			    TENDSTR), dev->nErasedBlocks, maxTries, block));
+		}
+	} while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
+		 && (maxTries < 2));
+
+	return aggressive ? gcOk : YAFFS_OK;
+}
+
+/*-------------------------  TAGS --------------------------------*/
+
+static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
+			   int chunkInObject)
+{
+	return (tags->chunkId == chunkInObject &&
+		tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
+
+}
+
+
+/*-------------------- Data file manipulation -----------------*/
+
+static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
+				 yaffs_ExtendedTags * tags)
+{
+	/*Get the Tnode, then get the level 0 offset chunk offset */
+	yaffs_Tnode *tn;
+	int theChunk = -1;
+	yaffs_ExtendedTags localTags;
+	int retVal = -1;
+
+	yaffs_Device *dev = in->myDev;
+
+	if (!tags) {
+		/* Passed a NULL, so use our own tags space */
+		tags = &localTags;
+	}
+
+	tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
+
+	if (tn) {
+		theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
+
+		retVal =
+		    yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
+					   chunkInInode);
+	}
+	return retVal;
+}
+
+static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
+					  yaffs_ExtendedTags * tags)
+{
+	/* Get the Tnode, then get the level 0 offset chunk offset */
+	yaffs_Tnode *tn;
+	int theChunk = -1;
+	yaffs_ExtendedTags localTags;
+
+	yaffs_Device *dev = in->myDev;
+	int retVal = -1;
+
+	if (!tags) {
+		/* Passed a NULL, so use our own tags space */
+		tags = &localTags;
+	}
+
+	tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
+
+	if (tn) {
+
+		theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
+
+		retVal =
+		    yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
+					   chunkInInode);
+
+		/* Delete the entry in the filestructure (if found) */
+		if (retVal != -1) {
+			yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
+		}
+	} else {
+		/*T(("No level 0 found for %d\n", chunkInInode)); */
+	}
+
+	if (retVal == -1) {
+		/* T(("Could not find %d to delete\n",chunkInInode)); */
+	}
+	return retVal;
+}
+
+#ifdef YAFFS_PARANOID
+
+static int yaffs_CheckFileSanity(yaffs_Object * in)
+{
+	int chunk;
+	int nChunks;
+	int fSize;
+	int failed = 0;
+	int objId;
+	yaffs_Tnode *tn;
+	yaffs_Tags localTags;
+	yaffs_Tags *tags = &localTags;
+	int theChunk;
+	int chunkDeleted;
+
+	if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
+		/* T(("Object not a file\n")); */
+		return YAFFS_FAIL;
+	}
+
+	objId = in->objectId;
+	fSize = in->variant.fileVariant.fileSize;
+	nChunks =
+	    (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
+
+	for (chunk = 1; chunk <= nChunks; chunk++) {
+		tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
+					   chunk);
+
+		if (tn) {
+
+			theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
+
+			if (yaffs_CheckChunkBits
+			    (dev, theChunk / dev->nChunksPerBlock,
+			     theChunk % dev->nChunksPerBlock)) {
+
+				yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
+							    tags,
+							    &chunkDeleted);
+				if (yaffs_TagsMatch
+				    (tags, in->objectId, chunk, chunkDeleted)) {
+					/* found it; */
+
+				}
+			} else {
+
+				failed = 1;
+			}
+
+		} else {
+			/* T(("No level 0 found for %d\n", chunk)); */
+		}
+	}
+
+	return failed ? YAFFS_FAIL : YAFFS_OK;
+}
+
+#endif
+
+static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
+				  int chunkInNAND, int inScan)
+{
+	/* NB inScan is zero unless scanning. 
+	 * For forward scanning, inScan is > 0; 
+	 * for backward scanning inScan is < 0
+	 */
+	 
+	yaffs_Tnode *tn;
+	yaffs_Device *dev = in->myDev;
+	int existingChunk;
+	yaffs_ExtendedTags existingTags;
+	yaffs_ExtendedTags newTags;
+	unsigned existingSerial, newSerial;
+
+	if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
+		/* Just ignore an attempt at putting a chunk into a non-file during scanning
+		 * If it is not during Scanning then something went wrong!
+		 */
+		if (!inScan) {
+			T(YAFFS_TRACE_ERROR,
+			  (TSTR
+			   ("yaffs tragedy:attempt to put data chunk into a non-file"
+			    TENDSTR)));
+			YBUG();
+		}
+
+		yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
+		return YAFFS_OK;
+	}
+
+	tn = yaffs_AddOrFindLevel0Tnode(dev, 
+					&in->variant.fileVariant,
+					chunkInInode,
+					NULL);
+	if (!tn) {
+		return YAFFS_FAIL;
+	}
+
+	existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
+
+	if (inScan != 0) {
+		/* If we're scanning then we need to test for duplicates
+		 * NB This does not need to be efficient since it should only ever 
+		 * happen when the power fails during a write, then only one
+		 * chunk should ever be affected.
+		 *
+		 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
+		 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
+		 */
+
+		if (existingChunk != 0) {
+			/* NB Right now existing chunk will not be real chunkId if the device >= 32MB
+			 *    thus we have to do a FindChunkInFile to get the real chunk id.
+			 *
+			 * We have a duplicate now we need to decide which one to use:
+			 *
+			 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
+			 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
+			 * YAFFS1: Get both sets of tags and compare serial numbers.
+			 */
+
+			if (inScan > 0) {
+				/* Only do this for forward scanning */
+				yaffs_ReadChunkWithTagsFromNAND(dev,
+								chunkInNAND,
+								NULL, &newTags);
+
+				/* Do a proper find */
+				existingChunk =
+				    yaffs_FindChunkInFile(in, chunkInInode,
+							  &existingTags);
+			}
+
+			if (existingChunk <= 0) {
+				/*Hoosterman - how did this happen? */
+
+				T(YAFFS_TRACE_ERROR,
+				  (TSTR
+				   ("yaffs tragedy: existing chunk < 0 in scan"
+				    TENDSTR)));
+
+			}
+
+			/* NB The deleted flags should be false, otherwise the chunks will 
+			 * not be loaded during a scan
+			 */
+
+			newSerial = newTags.serialNumber;
+			existingSerial = existingTags.serialNumber;
+
+			if ((inScan > 0) &&
+			    (in->myDev->isYaffs2 ||
+			     existingChunk <= 0 ||
+			     ((existingSerial + 1) & 3) == newSerial)) {
+				/* Forward scanning.                            
+				 * Use new
+				 * Delete the old one and drop through to update the tnode
+				 */
+				yaffs_DeleteChunk(dev, existingChunk, 1,
+						  __LINE__);
+			} else {
+				/* Backward scanning or we want to use the existing one
+				 * Use existing.
+				 * Delete the new one and return early so that the tnode isn't changed
+				 */
+				yaffs_DeleteChunk(dev, chunkInNAND, 1,
+						  __LINE__);
+				return YAFFS_OK;
+			}
+		}
+
+	}
+
+	if (existingChunk == 0) {
+		in->nDataChunks++;
+	}
+
+	yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
+
+	return YAFFS_OK;
+}
+
+static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
+					 __u8 * buffer)
+{
+	int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
+
+	if (chunkInNAND >= 0) {
+		return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
+						       buffer,NULL);
+	} else {
+		T(YAFFS_TRACE_NANDACCESS,
+		  (TSTR("Chunk %d not found zero instead" TENDSTR),
+		   chunkInNAND));
+		/* get sane (zero) data if you read a hole */
+		memset(buffer, 0, in->myDev->nDataBytesPerChunk);	
+		return 0;
+	}
+
+}
+
+void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
+{
+	int block;
+	int page;
+	yaffs_ExtendedTags tags;
+	yaffs_BlockInfo *bi;
+
+	if (chunkId <= 0)
+		return;
+		
+
+	dev->nDeletions++;
+	block = chunkId / dev->nChunksPerBlock;
+	page = chunkId % dev->nChunksPerBlock;
+
+
+	if(!yaffs_CheckChunkBit(dev,block,page))
+		T(YAFFS_TRACE_VERIFY,
+		 	(TSTR("Deleting invalid chunk %d"TENDSTR),
+		 	 chunkId));
+
+	bi = yaffs_GetBlockInfo(dev, block);
+
+	T(YAFFS_TRACE_DELETION,
+	  (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
+
+	if (markNAND &&
+	    bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
+
+		yaffs_InitialiseTags(&tags);
+
+		tags.chunkDeleted = 1;
+
+		yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
+		yaffs_HandleUpdateChunk(dev, chunkId, &tags);
+	} else {
+		dev->nUnmarkedDeletions++;
+	}
+
+	/* Pull out of the management area.
+	 * If the whole block became dirty, this will kick off an erasure.
+	 */
+	if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
+	    bi->blockState == YAFFS_BLOCK_STATE_FULL ||
+	    bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+	    bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
+		dev->nFreeChunks++;
+
+		yaffs_ClearChunkBit(dev, block, page);
+
+		bi->pagesInUse--;
+
+		if (bi->pagesInUse == 0 &&
+		    !bi->hasShrinkHeader &&
+		    bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
+		    bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+			yaffs_BlockBecameDirty(dev, block);
+		}
+
+	} else {
+		/* T(("Bad news deleting chunk %d\n",chunkId)); */
+	}
+
+}
+
+static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
+					const __u8 * buffer, int nBytes,
+					int useReserve)
+{
+	/* Find old chunk Need to do this to get serial number
+	 * Write new one and patch into tree.
+	 * Invalidate old tags.
+	 */
+
+	int prevChunkId;
+	yaffs_ExtendedTags prevTags;
+
+	int newChunkId;
+	yaffs_ExtendedTags newTags;
+
+	yaffs_Device *dev = in->myDev;
+
+	yaffs_CheckGarbageCollection(dev);
+
+	/* Get the previous chunk at this location in the file if it exists */
+	prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
+
+	/* Set up new tags */
+	yaffs_InitialiseTags(&newTags);
+
+	newTags.chunkId = chunkInInode;
+	newTags.objectId = in->objectId;
+	newTags.serialNumber =
+	    (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
+	newTags.byteCount = nBytes;
+
+	newChunkId =
+	    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
+					      useReserve);
+
+	if (newChunkId >= 0) {
+		yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
+
+		if (prevChunkId >= 0) {
+			yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
+
+		}
+
+		yaffs_CheckFileSanity(in);
+	}
+	return newChunkId;
+
+}
+
+/* UpdateObjectHeader updates the header on NAND for an object.
+ * If name is not NULL, then that new name is used.
+ */
+int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
+			     int isShrink, int shadows)
+{
+
+	yaffs_BlockInfo *bi;
+
+	yaffs_Device *dev = in->myDev;
+
+	int prevChunkId;
+	int retVal = 0;
+	int result = 0;
+
+	int newChunkId;
+	yaffs_ExtendedTags newTags;
+	yaffs_ExtendedTags oldTags;
+
+	__u8 *buffer = NULL;
+	YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
+
+	yaffs_ObjectHeader *oh = NULL;
+	
+	yaffs_strcpy(oldName,"silly old name");
+
+	if (!in->fake || force) {
+
+		yaffs_CheckGarbageCollection(dev);
+		yaffs_CheckObjectDetailsLoaded(in);
+
+		buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
+		oh = (yaffs_ObjectHeader *) buffer;
+
+		prevChunkId = in->chunkId;
+
+		if (prevChunkId >= 0) {
+			result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
+							buffer, &oldTags);
+			
+			yaffs_VerifyObjectHeader(in,oh,&oldTags,0);
+										
+			memcpy(oldName, oh->name, sizeof(oh->name));
+		}
+
+		memset(buffer, 0xFF, dev->nDataBytesPerChunk);
+
+		oh->type = in->variantType;
+		oh->yst_mode = in->yst_mode;
+		oh->shadowsObject = shadows;
+
+#ifdef CONFIG_YAFFS_WINCE
+		oh->win_atime[0] = in->win_atime[0];
+		oh->win_ctime[0] = in->win_ctime[0];
+		oh->win_mtime[0] = in->win_mtime[0];
+		oh->win_atime[1] = in->win_atime[1];
+		oh->win_ctime[1] = in->win_ctime[1];
+		oh->win_mtime[1] = in->win_mtime[1];
+#else
+		oh->yst_uid = in->yst_uid;
+		oh->yst_gid = in->yst_gid;
+		oh->yst_atime = in->yst_atime;
+		oh->yst_mtime = in->yst_mtime;
+		oh->yst_ctime = in->yst_ctime;
+		oh->yst_rdev = in->yst_rdev;
+#endif
+		if (in->parent) {
+			oh->parentObjectId = in->parent->objectId;
+		} else {
+			oh->parentObjectId = 0;
+		}
+
+		if (name && *name) {
+			memset(oh->name, 0, sizeof(oh->name));
+			yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
+		} else if (prevChunkId>=0) {
+			memcpy(oh->name, oldName, sizeof(oh->name));
+		} else {
+			memset(oh->name, 0, sizeof(oh->name));
+		}
+
+		oh->isShrink = isShrink;
+
+		switch (in->variantType) {
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+			/* Should not happen */
+			break;
+		case YAFFS_OBJECT_TYPE_FILE:
+			oh->fileSize =
+			    (oh->parentObjectId == YAFFS_OBJECTID_DELETED
+			     || oh->parentObjectId ==
+			     YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
+			    fileVariant.fileSize;
+			break;
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+			oh->equivalentObjectId =
+			    in->variant.hardLinkVariant.equivalentObjectId;
+			break;
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+			/* Do nothing */
+			break;
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+			/* Do nothing */
+			break;
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			yaffs_strncpy(oh->alias,
+				      in->variant.symLinkVariant.alias,
+				      YAFFS_MAX_ALIAS_LENGTH);
+			oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+			break;
+		}
+
+		/* Tags */
+		yaffs_InitialiseTags(&newTags);
+		in->serial++;
+		newTags.chunkId = 0;
+		newTags.objectId = in->objectId;
+		newTags.serialNumber = in->serial;
+
+		/* Add extra info for file header */
+
+		newTags.extraHeaderInfoAvailable = 1;
+		newTags.extraParentObjectId = oh->parentObjectId;
+		newTags.extraFileLength = oh->fileSize;
+		newTags.extraIsShrinkHeader = oh->isShrink;
+		newTags.extraEquivalentObjectId = oh->equivalentObjectId;
+		newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
+		newTags.extraObjectType = in->variantType;
+
+		yaffs_VerifyObjectHeader(in,oh,&newTags,1);
+
+		/* Create new chunk in NAND */
+		newChunkId =
+		    yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
+						      (prevChunkId >= 0) ? 1 : 0);
+
+		if (newChunkId >= 0) {
+
+			in->chunkId = newChunkId;
+
+			if (prevChunkId >= 0) {
+				yaffs_DeleteChunk(dev, prevChunkId, 1,
+						  __LINE__);
+			}
+
+			if(!yaffs_ObjectHasCachedWriteData(in))
+				in->dirty = 0;
+
+			/* If this was a shrink, then mark the block that the chunk lives on */
+			if (isShrink) {
+				bi = yaffs_GetBlockInfo(in->myDev,
+							newChunkId /in->myDev->	nChunksPerBlock);
+				bi->hasShrinkHeader = 1;
+			}
+
+		}
+
+		retVal = newChunkId;
+
+	}
+
+	if (buffer)
+		yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
+
+	return retVal;
+}
+
+/*------------------------ Short Operations Cache ----------------------------------------
+ *   In many situations where there is no high level buffering (eg WinCE) a lot of
+ *   reads might be short sequential reads, and a lot of writes may be short 
+ *   sequential writes. eg. scanning/writing a jpeg file.
+ *   In these cases, a short read/write cache can provide a huge perfomance benefit 
+ *   with dumb-as-a-rock code.
+ *   In Linux, the page cache provides read buffering aand the short op cache provides write 
+ *   buffering.
+ *
+ *   There are a limited number (~10) of cache chunks per device so that we don't
+ *   need a very intelligent search.
+ */
+
+static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
+{
+	yaffs_Device *dev = obj->myDev;
+	int i;
+	yaffs_ChunkCache *cache;
+	int nCaches = obj->myDev->nShortOpCaches;
+	
+	for(i = 0; i < nCaches; i++){
+		cache = &dev->srCache[i];
+		if (cache->object == obj &&
+		    cache->dirty)
+			return 1;
+	}
+	
+	return 0;
+}
+
+
+static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
+{
+	yaffs_Device *dev = obj->myDev;
+	int lowest = -99;	/* Stop compiler whining. */
+	int i;
+	yaffs_ChunkCache *cache;
+	int chunkWritten = 0;
+	int nCaches = obj->myDev->nShortOpCaches;
+
+	if (nCaches > 0) {
+		do {
+			cache = NULL;
+
+			/* Find the dirty cache for this object with the lowest chunk id. */
+			for (i = 0; i < nCaches; i++) {
+				if (dev->srCache[i].object == obj &&
+				    dev->srCache[i].dirty) {
+					if (!cache
+					    || dev->srCache[i].chunkId <
+					    lowest) {
+						cache = &dev->srCache[i];
+						lowest = cache->chunkId;
+					}
+				}
+			}
+
+			if (cache && !cache->locked) {
+				/* Write it out and free it up */
+
+				chunkWritten =
+				    yaffs_WriteChunkDataToObject(cache->object,
+								 cache->chunkId,
+								 cache->data,
+								 cache->nBytes,
+								 1);
+				cache->dirty = 0;
+				cache->object = NULL;
+			}
+
+		} while (cache && chunkWritten > 0);
+
+		if (cache) {
+			/* Hoosterman, disk full while writing cache out. */
+			T(YAFFS_TRACE_ERROR,
+			  (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
+
+		}
+	}
+
+}
+
+/*yaffs_FlushEntireDeviceCache(dev)
+ *
+ *
+ */
+
+void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	int nCaches = dev->nShortOpCaches;
+	int i;
+	
+	/* Find a dirty object in the cache and flush it...
+	 * until there are no further dirty objects.
+	 */
+	do {
+		obj = NULL;
+		for( i = 0; i < nCaches && !obj; i++) {
+			if (dev->srCache[i].object &&
+			    dev->srCache[i].dirty)
+				obj = dev->srCache[i].object;
+			    
+		}
+		if(obj)
+			yaffs_FlushFilesChunkCache(obj);
+			
+	} while(obj);
+	
+}
+
+
+/* Grab us a cache chunk for use.
+ * First look for an empty one. 
+ * Then look for the least recently used non-dirty one.
+ * Then look for the least recently used dirty one...., flush and look again.
+ */
+static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
+{
+	int i;
+	int usage;
+	int theOne;
+
+	if (dev->nShortOpCaches > 0) {
+		for (i = 0; i < dev->nShortOpCaches; i++) {
+			if (!dev->srCache[i].object) 
+				return &dev->srCache[i];
+		}
+
+		return NULL;
+
+		theOne = -1;
+		usage = 0;	/* just to stop the compiler grizzling */
+
+		for (i = 0; i < dev->nShortOpCaches; i++) {
+			if (!dev->srCache[i].dirty &&
+			    ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
+			     theOne < 0)) {
+				usage = dev->srCache[i].lastUse;
+				theOne = i;
+			}
+		}
+
+
+		return theOne >= 0 ? &dev->srCache[theOne] : NULL;
+	} else {
+		return NULL;
+	}
+
+}
+
+static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
+{
+	yaffs_ChunkCache *cache;
+	yaffs_Object *theObj;
+	int usage;
+	int i;
+	int pushout;
+
+	if (dev->nShortOpCaches > 0) {
+		/* Try find a non-dirty one... */
+
+		cache = yaffs_GrabChunkCacheWorker(dev);
+
+		if (!cache) {
+			/* They were all dirty, find the last recently used object and flush
+			 * its cache, then  find again.
+			 * NB what's here is not very accurate, we actually flush the object
+			 * the last recently used page.
+			 */
+
+			/* With locking we can't assume we can use entry zero */
+
+			theObj = NULL;
+			usage = -1;
+			cache = NULL;
+			pushout = -1;
+
+			for (i = 0; i < dev->nShortOpCaches; i++) {
+				if (dev->srCache[i].object &&
+				    !dev->srCache[i].locked &&
+				    (dev->srCache[i].lastUse < usage || !cache))
+				{
+					usage = dev->srCache[i].lastUse;
+					theObj = dev->srCache[i].object;
+					cache = &dev->srCache[i];
+					pushout = i;
+				}
+			}
+
+			if (!cache || cache->dirty) {
+				/* Flush and try again */
+				yaffs_FlushFilesChunkCache(theObj);
+				cache = yaffs_GrabChunkCacheWorker(dev);
+			}
+
+		}
+		return cache;
+	} else
+		return NULL;
+
+}
+
+/* Find a cached chunk */
+static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
+					      int chunkId)
+{
+	yaffs_Device *dev = obj->myDev;
+	int i;
+	if (dev->nShortOpCaches > 0) {
+		for (i = 0; i < dev->nShortOpCaches; i++) {
+			if (dev->srCache[i].object == obj &&
+			    dev->srCache[i].chunkId == chunkId) {
+				dev->cacheHits++;
+
+				return &dev->srCache[i];
+			}
+		}
+	}
+	return NULL;
+}
+
+/* Mark the chunk for the least recently used algorithym */
+static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
+				int isAWrite)
+{
+
+	if (dev->nShortOpCaches > 0) {
+		if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
+			/* Reset the cache usages */
+			int i;
+			for (i = 1; i < dev->nShortOpCaches; i++) {
+				dev->srCache[i].lastUse = 0;
+			}
+			dev->srLastUse = 0;
+		}
+
+		dev->srLastUse++;
+
+		cache->lastUse = dev->srLastUse;
+
+		if (isAWrite) {
+			cache->dirty = 1;
+		}
+	}
+}
+
+/* Invalidate a single cache page.
+ * Do this when a whole page gets written,
+ * ie the short cache for this page is no longer valid.
+ */
+static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
+{
+	if (object->myDev->nShortOpCaches > 0) {
+		yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
+
+		if (cache) {
+			cache->object = NULL;
+		}
+	}
+}
+
+/* Invalidate all the cache pages associated with this object
+ * Do this whenever ther file is deleted or resized.
+ */
+static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
+{
+	int i;
+	yaffs_Device *dev = in->myDev;
+
+	if (dev->nShortOpCaches > 0) {
+		/* Invalidate it. */
+		for (i = 0; i < dev->nShortOpCaches; i++) {
+			if (dev->srCache[i].object == in) {
+				dev->srCache[i].object = NULL;
+			}
+		}
+	}
+}
+
+/*--------------------- Checkpointing --------------------*/
+
+
+static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
+{
+	yaffs_CheckpointValidity cp;
+	
+	memset(&cp,0,sizeof(cp));
+	
+	cp.structType = sizeof(cp);
+	cp.magic = YAFFS_MAGIC;
+	cp.version = YAFFS_CHECKPOINT_VERSION;
+	cp.head = (head) ? 1 : 0;
+	
+	return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
+		1 : 0;
+}
+
+static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
+{
+	yaffs_CheckpointValidity cp;
+	int ok;
+	
+	ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
+	
+	if(ok)
+		ok = (cp.structType == sizeof(cp)) &&
+		     (cp.magic == YAFFS_MAGIC) &&
+		     (cp.version == YAFFS_CHECKPOINT_VERSION) &&
+		     (cp.head == ((head) ? 1 : 0));
+	return ok ? 1 : 0;
+}
+
+static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp, 
+					   yaffs_Device *dev)
+{
+	cp->nErasedBlocks = dev->nErasedBlocks;
+	cp->allocationBlock = dev->allocationBlock;
+	cp->allocationPage = dev->allocationPage;
+	cp->nFreeChunks = dev->nFreeChunks;
+	
+	cp->nDeletedFiles = dev->nDeletedFiles;
+	cp->nUnlinkedFiles = dev->nUnlinkedFiles;
+	cp->nBackgroundDeletions = dev->nBackgroundDeletions;
+	cp->sequenceNumber = dev->sequenceNumber;
+	cp->oldestDirtySequence = dev->oldestDirtySequence;
+	
+}
+
+static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
+					   yaffs_CheckpointDevice *cp)
+{
+	dev->nErasedBlocks = cp->nErasedBlocks;
+	dev->allocationBlock = cp->allocationBlock;
+	dev->allocationPage = cp->allocationPage;
+	dev->nFreeChunks = cp->nFreeChunks;
+	
+	dev->nDeletedFiles = cp->nDeletedFiles;
+	dev->nUnlinkedFiles = cp->nUnlinkedFiles;
+	dev->nBackgroundDeletions = cp->nBackgroundDeletions;
+	dev->sequenceNumber = cp->sequenceNumber;
+	dev->oldestDirtySequence = cp->oldestDirtySequence;
+}
+
+
+static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
+{
+	yaffs_CheckpointDevice cp;
+	__u32 nBytes;
+	__u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
+
+	int ok;
+		
+	/* Write device runtime values*/
+	yaffs_DeviceToCheckpointDevice(&cp,dev);
+	cp.structType = sizeof(cp);
+	
+	ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
+	
+	/* Write block info */
+	if(ok) {
+		nBytes = nBlocks * sizeof(yaffs_BlockInfo);
+		ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
+	}
+		
+	/* Write chunk bits */		
+	if(ok) {
+		nBytes = nBlocks * dev->chunkBitmapStride;
+		ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
+	}
+	return	 ok ? 1 : 0;
+
+}
+
+static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
+{
+	yaffs_CheckpointDevice cp;
+	__u32 nBytes;
+	__u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
+
+	int ok;	
+	
+	ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
+	if(!ok)
+		return 0;
+		
+	if(cp.structType != sizeof(cp))
+		return 0;
+		
+	
+	yaffs_CheckpointDeviceToDevice(dev,&cp);
+	
+	nBytes = nBlocks * sizeof(yaffs_BlockInfo);
+	
+	ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
+	
+	if(!ok)
+		return 0;
+	nBytes = nBlocks * dev->chunkBitmapStride;
+	
+	ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
+	
+	return ok ? 1 : 0;
+}
+
+static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
+					   yaffs_Object *obj)
+{
+
+	cp->objectId = obj->objectId;
+	cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
+	cp->chunkId = obj->chunkId;
+	cp->variantType = obj->variantType;			
+	cp->deleted = obj->deleted;
+	cp->softDeleted = obj->softDeleted;
+	cp->unlinked = obj->unlinked;
+	cp->fake = obj->fake;
+	cp->renameAllowed = obj->renameAllowed;
+	cp->unlinkAllowed = obj->unlinkAllowed;
+	cp->serial = obj->serial;
+	cp->nDataChunks = obj->nDataChunks;
+	
+	if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
+		cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
+	else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
+		cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
+}
+
+static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
+{
+
+	yaffs_Object *parent;
+	
+	obj->objectId = cp->objectId;
+	
+	if(cp->parentId)
+		parent = yaffs_FindOrCreateObjectByNumber(
+					obj->myDev,
+					cp->parentId,
+					YAFFS_OBJECT_TYPE_DIRECTORY);
+	else
+		parent = NULL;
+		
+	if(parent)
+		yaffs_AddObjectToDirectory(parent, obj);
+		
+	obj->chunkId = cp->chunkId;
+	obj->variantType = cp->variantType;			
+	obj->deleted = cp->deleted;
+	obj->softDeleted = cp->softDeleted;
+	obj->unlinked = cp->unlinked;
+	obj->fake = cp->fake;
+	obj->renameAllowed = cp->renameAllowed;
+	obj->unlinkAllowed = cp->unlinkAllowed;
+	obj->serial = cp->serial;
+	obj->nDataChunks = cp->nDataChunks;
+	
+	if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
+		obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
+	else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
+		obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
+		
+	if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
+		obj->lazyLoaded = 1;
+}
+
+
+
+static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
+				  	__u32 level, int chunkOffset)
+{
+	int i;
+	yaffs_Device *dev = in->myDev;
+	int ok = 1;
+	int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
+
+	if (tn) {
+		if (level > 0) {
+
+			for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
+				if (tn->internal[i]) {
+					ok = yaffs_CheckpointTnodeWorker(in,
+							tn->internal[i],
+							level - 1,
+							(chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
+				}
+			}
+		} else if (level == 0) {
+			__u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
+			/* printf("write tnode at %d\n",baseOffset); */
+			ok = (yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset)) == sizeof(baseOffset));
+			if(ok)
+				ok = (yaffs_CheckpointWrite(dev,tn,nTnodeBytes) == nTnodeBytes);
+		}
+	}
+
+	return ok;
+
+}
+
+static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
+{
+	__u32 endMarker = ~0;
+	int ok = 1;
+	
+	if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
+		ok = yaffs_CheckpointTnodeWorker(obj,
+					    obj->variant.fileVariant.top,
+					    obj->variant.fileVariant.topLevel,
+					    0);
+		if(ok)
+			ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) == 
+				sizeof(endMarker));
+	}
+	
+	return ok ? 1 : 0;
+}
+
+static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
+{
+	__u32 baseChunk;
+	int ok = 1;
+	yaffs_Device *dev = obj->myDev;
+	yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
+	yaffs_Tnode *tn;
+	int nread = 0;
+	
+	ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
+	
+	while(ok && (~baseChunk)){
+		nread++;
+		/* Read level 0 tnode */
+		
+		
+		/* printf("read  tnode at %d\n",baseChunk); */
+		tn = yaffs_GetTnodeRaw(dev);
+		if(tn)
+			ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) ==
+			      (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
+		else
+			ok = 0;
+			
+		if(tn && ok){
+			ok = yaffs_AddOrFindLevel0Tnode(dev,
+					       		fileStructPtr,
+					       		baseChunk,
+					       		tn) ? 1 : 0;
+					       		
+		}
+			
+		if(ok)
+			ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
+		
+	}
+
+	T(YAFFS_TRACE_CHECKPOINT,(
+		TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
+		nread,baseChunk,ok));
+
+	return ok ? 1 : 0;	
+}
+ 
+
+static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	yaffs_CheckpointObject cp;
+	int i;
+	int ok = 1;
+	struct list_head *lh;
+
+	
+	/* Iterate through the objects in each hash entry,
+	 * dumping them to the checkpointing stream.
+	 */
+	 
+	 for(i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++){
+	 	list_for_each(lh, &dev->objectBucket[i].list) {
+			if (lh) {
+				obj = list_entry(lh, yaffs_Object, hashLink);
+				if (!obj->deferedFree) {
+					yaffs_ObjectToCheckpointObject(&cp,obj);
+					cp.structType = sizeof(cp);
+
+					T(YAFFS_TRACE_CHECKPOINT,(
+						TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
+						cp.objectId,cp.parentId,cp.variantType,cp.chunkId,(unsigned) obj));
+						
+					ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
+					
+					if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
+						ok = yaffs_WriteCheckpointTnodes(obj);
+					}
+				}
+			}
+		}
+	 }
+	 
+	 /* Dump end of list */
+	memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
+	cp.structType = sizeof(cp);
+	
+	if(ok)
+		ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
+		
+	return ok ? 1 : 0;
+}
+
+static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
+{
+	yaffs_Object *obj;
+	yaffs_CheckpointObject cp;
+	int ok = 1;
+	int done = 0;
+	yaffs_Object *hardList = NULL;
+	
+	while(ok && !done) {
+		ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
+		if(cp.structType != sizeof(cp)) {
+			T(YAFFS_TRACE_CHECKPOINT,(TSTR("struct size %d instead of %d ok %d"TENDSTR),
+				cp.structType,sizeof(cp),ok));
+			ok = 0;
+		}
+			
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
+			cp.objectId,cp.parentId,cp.variantType,cp.chunkId));
+			
+		if(ok && cp.objectId == ~0)
+			done = 1;
+		else if(ok){
+			obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
+			if(obj) {
+				yaffs_CheckpointObjectToObject(obj,&cp);
+				if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
+					ok = yaffs_ReadCheckpointTnodes(obj);
+				} else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
+					obj->hardLinks.next =
+						    (struct list_head *)
+						    hardList;
+					hardList = obj;
+				}
+			   
+			}
+		}
+	}
+	
+	if(ok)
+		yaffs_HardlinkFixup(dev,hardList);
+	
+	return ok ? 1 : 0;
+}
+
+static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
+{
+	__u32 checkpointSum;
+	int ok;
+	
+	yaffs_GetCheckpointSum(dev,&checkpointSum);
+	
+	ok = (yaffs_CheckpointWrite(dev,&checkpointSum,sizeof(checkpointSum)) == sizeof(checkpointSum));
+	
+	if(!ok)
+		return 0;
+	
+	return 1;
+}
+
+static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
+{
+	__u32 checkpointSum0;
+	__u32 checkpointSum1;
+	int ok;
+	
+	yaffs_GetCheckpointSum(dev,&checkpointSum0);
+	
+	ok = (yaffs_CheckpointRead(dev,&checkpointSum1,sizeof(checkpointSum1)) == sizeof(checkpointSum1));
+	
+	if(!ok)
+		return 0;
+		
+	if(checkpointSum0 != checkpointSum1)
+		return 0;
+	
+	return 1;
+}
+
+
+static int yaffs_WriteCheckpointData(yaffs_Device *dev)
+{
+
+	int ok = 1;
+	
+	if(dev->skipCheckpointWrite || !dev->isYaffs2){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint write" TENDSTR)));
+		ok = 0;
+	}
+		
+	if(ok)
+		ok = yaffs_CheckpointOpen(dev,1);
+	
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
+		ok = yaffs_WriteCheckpointValidityMarker(dev,1);
+	}
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint device" TENDSTR)));
+		ok = yaffs_WriteCheckpointDevice(dev);
+	}
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint objects" TENDSTR)));
+		ok = yaffs_WriteCheckpointObjects(dev);
+	}
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
+		ok = yaffs_WriteCheckpointValidityMarker(dev,0);
+	}
+	
+	if(ok){
+		ok = yaffs_WriteCheckpointSum(dev);
+	}
+	
+	
+	if(!yaffs_CheckpointClose(dev))
+		 ok = 0;
+		 
+	if(ok)
+	    	dev->isCheckpointed = 1;
+	 else 
+	 	dev->isCheckpointed = 0;
+
+	return dev->isCheckpointed;
+}
+
+static int yaffs_ReadCheckpointData(yaffs_Device *dev)
+{
+	int ok = 1;
+	
+	if(dev->skipCheckpointRead || !dev->isYaffs2){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint read" TENDSTR)));
+		ok = 0;
+	}
+	
+	if(ok)
+		ok = yaffs_CheckpointOpen(dev,0); /* open for read */
+	
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));	
+		ok = yaffs_ReadCheckpointValidityMarker(dev,1);
+	}
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint device" TENDSTR)));
+		ok = yaffs_ReadCheckpointDevice(dev);
+	}
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint objects" TENDSTR)));	
+		ok = yaffs_ReadCheckpointObjects(dev);
+	}
+	if(ok){
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
+		ok = yaffs_ReadCheckpointValidityMarker(dev,0);
+	}
+	
+	if(ok){
+		ok = yaffs_ReadCheckpointSum(dev);
+		T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint checksum %d" TENDSTR),ok));
+	}
+
+	if(!yaffs_CheckpointClose(dev))
+		ok = 0;
+
+	if(ok)
+	    	dev->isCheckpointed = 1;
+	 else 
+	 	dev->isCheckpointed = 0;
+
+	return ok ? 1 : 0;
+
+}
+
+static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
+{
+	if(dev->isCheckpointed || 
+	   dev->blocksInCheckpoint > 0){
+		dev->isCheckpointed = 0;
+		yaffs_CheckpointInvalidateStream(dev);
+		if(dev->superBlock && dev->markSuperBlockDirty)
+			dev->markSuperBlockDirty(dev->superBlock);
+	}
+}
+
+
+int yaffs_CheckpointSave(yaffs_Device *dev)
+{
+
+	T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
+
+	yaffs_VerifyObjects(dev);
+	yaffs_VerifyBlocks(dev);
+	yaffs_VerifyFreeChunks(dev);
+
+	if(!dev->isCheckpointed) {
+		yaffs_InvalidateCheckpoint(dev);
+		yaffs_WriteCheckpointData(dev);
+	}
+	
+	T(YAFFS_TRACE_ALWAYS,(TSTR("save exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
+
+	return dev->isCheckpointed;
+}
+
+int yaffs_CheckpointRestore(yaffs_Device *dev)
+{
+	int retval;
+	T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
+		
+	retval = yaffs_ReadCheckpointData(dev);
+
+	if(dev->isCheckpointed){
+		yaffs_VerifyObjects(dev);
+		yaffs_VerifyBlocks(dev);
+		yaffs_VerifyFreeChunks(dev);
+	}
+
+	T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
+	
+	return retval;
+}
+
+/*--------------------- File read/write ------------------------
+ * Read and write have very similar structures.
+ * In general the read/write has three parts to it
+ * An incomplete chunk to start with (if the read/write is not chunk-aligned)
+ * Some complete chunks
+ * An incomplete chunk to end off with
+ *
+ * Curve-balls: the first chunk might also be the last chunk.
+ */
+
+int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, loff_t offset,
+			   int nBytes)
+{
+
+	int chunk;
+	int start;
+	int nToCopy;
+	int n = nBytes;
+	int nDone = 0;
+	yaffs_ChunkCache *cache;
+
+	yaffs_Device *dev;
+
+	dev = in->myDev;
+
+	while (n > 0) {
+		//chunk = offset / dev->nDataBytesPerChunk + 1;
+		//start = offset % dev->nDataBytesPerChunk;
+		yaffs_AddrToChunk(dev,offset,&chunk,&start);
+		chunk++;
+
+		/* OK now check for the curveball where the start and end are in
+		 * the same chunk.      
+		 */
+		if ((start + n) < dev->nDataBytesPerChunk) {
+			nToCopy = n;
+		} else {
+			nToCopy = dev->nDataBytesPerChunk - start;
+		}
+
+		cache = yaffs_FindChunkCache(in, chunk);
+
+		/* If the chunk is already in the cache or it is less than a whole chunk
+		 * then use the cache (if there is caching)
+		 * else bypass the cache.
+		 */
+		if (cache || nToCopy != dev->nDataBytesPerChunk) {
+			if (dev->nShortOpCaches > 0) {
+
+				/* If we can't find the data in the cache, then load it up. */
+
+				if (!cache) {
+					cache = yaffs_GrabChunkCache(in->myDev);
+					cache->object = in;
+					cache->chunkId = chunk;
+					cache->dirty = 0;
+					cache->locked = 0;
+					yaffs_ReadChunkDataFromObject(in, chunk,
+								      cache->
+								      data);
+					cache->nBytes = 0;
+				}
+
+				yaffs_UseChunkCache(dev, cache, 0);
+
+				cache->locked = 1;
+
+#ifdef CONFIG_YAFFS_WINCE
+				yfsd_UnlockYAFFS(TRUE);
+#endif
+				memcpy(buffer, &cache->data[start], nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+				yfsd_LockYAFFS(TRUE);
+#endif
+				cache->locked = 0;
+			} else {
+				/* Read into the local buffer then copy..*/
+
+				__u8 *localBuffer =
+				    yaffs_GetTempBuffer(dev, __LINE__);
+				yaffs_ReadChunkDataFromObject(in, chunk,
+							      localBuffer);
+#ifdef CONFIG_YAFFS_WINCE
+				yfsd_UnlockYAFFS(TRUE);
+#endif
+				memcpy(buffer, &localBuffer[start], nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+				yfsd_LockYAFFS(TRUE);
+#endif
+				yaffs_ReleaseTempBuffer(dev, localBuffer,
+							__LINE__);
+			}
+
+		} else {
+#ifdef CONFIG_YAFFS_WINCE
+			__u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
+
+			/* Under WinCE can't do direct transfer. Need to use a local buffer.
+			 * This is because we otherwise screw up WinCE's memory mapper
+			 */
+			yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
+
+#ifdef CONFIG_YAFFS_WINCE
+			yfsd_UnlockYAFFS(TRUE);
+#endif
+			memcpy(buffer, localBuffer, dev->nDataBytesPerChunk);
+
+#ifdef CONFIG_YAFFS_WINCE
+			yfsd_LockYAFFS(TRUE);
+			yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
+#endif
+
+#else
+			/* A full chunk. Read directly into the supplied buffer. */
+			yaffs_ReadChunkDataFromObject(in, chunk, buffer);
+#endif
+		}
+
+		n -= nToCopy;
+		offset += nToCopy;
+		buffer += nToCopy;
+		nDone += nToCopy;
+
+	}
+
+	return nDone;
+}
+
+int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, loff_t offset,
+			  int nBytes, int writeThrough)
+{
+
+	int chunk;
+	int start;
+	int nToCopy;
+	int n = nBytes;
+	int nDone = 0;
+	int nToWriteBack;
+	int startOfWrite = offset;
+	int chunkWritten = 0;
+	int nBytesRead;
+
+	yaffs_Device *dev;
+
+	dev = in->myDev;
+
+	while (n > 0 && chunkWritten >= 0) {
+		//chunk = offset / dev->nDataBytesPerChunk + 1;
+		//start = offset % dev->nDataBytesPerChunk;
+		yaffs_AddrToChunk(dev,offset,&chunk,&start);
+		chunk++;
+
+		/* OK now check for the curveball where the start and end are in
+		 * the same chunk.
+		 */
+
+		if ((start + n) < dev->nDataBytesPerChunk) {
+			nToCopy = n;
+
+			/* Now folks, to calculate how many bytes to write back....
+			 * If we're overwriting and not writing to then end of file then
+			 * we need to write back as much as was there before.
+			 */
+
+			nBytesRead =
+			    in->variant.fileVariant.fileSize -
+			    ((chunk - 1) * dev->nDataBytesPerChunk);
+
+			if (nBytesRead > dev->nDataBytesPerChunk) {
+				nBytesRead = dev->nDataBytesPerChunk;
+			}
+
+			nToWriteBack =
+			    (nBytesRead >
+			     (start + n)) ? nBytesRead : (start + n);
+
+		} else {
+			nToCopy = dev->nDataBytesPerChunk - start;
+			nToWriteBack = dev->nDataBytesPerChunk;
+		}
+
+		if (nToCopy != dev->nDataBytesPerChunk) {
+			/* An incomplete start or end chunk (or maybe both start and end chunk) */
+			if (dev->nShortOpCaches > 0) {
+				yaffs_ChunkCache *cache;
+				/* If we can't find the data in the cache, then load the cache */
+				cache = yaffs_FindChunkCache(in, chunk);
+				
+				if (!cache
+				    && yaffs_CheckSpaceForAllocation(in->
+								     myDev)) {
+					cache = yaffs_GrabChunkCache(in->myDev);
+					cache->object = in;
+					cache->chunkId = chunk;
+					cache->dirty = 0;
+					cache->locked = 0;
+					yaffs_ReadChunkDataFromObject(in, chunk,
+								      cache->
+								      data);
+				}
+				else if(cache && 
+				        !cache->dirty &&
+					!yaffs_CheckSpaceForAllocation(in->myDev)){
+					/* Drop the cache if it was a read cache item and
+					 * no space check has been made for it.
+					 */ 
+					 cache = NULL;
+				}
+
+				if (cache) {
+					yaffs_UseChunkCache(dev, cache, 1);
+					cache->locked = 1;
+#ifdef CONFIG_YAFFS_WINCE
+					yfsd_UnlockYAFFS(TRUE);
+#endif
+
+					memcpy(&cache->data[start], buffer,
+					       nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+					yfsd_LockYAFFS(TRUE);
+#endif
+					cache->locked = 0;
+					cache->nBytes = nToWriteBack;
+
+					if (writeThrough) {
+						chunkWritten =
+						    yaffs_WriteChunkDataToObject
+						    (cache->object,
+						     cache->chunkId,
+						     cache->data, cache->nBytes,
+						     1);
+						cache->dirty = 0;
+					}
+
+				} else {
+					chunkWritten = -1;	/* fail the write */
+				}
+			} else {
+				/* An incomplete start or end chunk (or maybe both start and end chunk)
+				 * Read into the local buffer then copy, then copy over and write back.
+				 */
+
+				__u8 *localBuffer =
+				    yaffs_GetTempBuffer(dev, __LINE__);
+
+				yaffs_ReadChunkDataFromObject(in, chunk,
+							      localBuffer);
+
+#ifdef CONFIG_YAFFS_WINCE
+				yfsd_UnlockYAFFS(TRUE);
+#endif
+
+				memcpy(&localBuffer[start], buffer, nToCopy);
+
+#ifdef CONFIG_YAFFS_WINCE
+				yfsd_LockYAFFS(TRUE);
+#endif
+				chunkWritten =
+				    yaffs_WriteChunkDataToObject(in, chunk,
+								 localBuffer,
+								 nToWriteBack,
+								 0);
+
+				yaffs_ReleaseTempBuffer(dev, localBuffer,
+							__LINE__);
+
+			}
+
+		} else {
+
+#ifdef CONFIG_YAFFS_WINCE
+			/* Under WinCE can't do direct transfer. Need to use a local buffer.
+			 * This is because we otherwise screw up WinCE's memory mapper
+			 */
+			__u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
+#ifdef CONFIG_YAFFS_WINCE
+			yfsd_UnlockYAFFS(TRUE);
+#endif
+			memcpy(localBuffer, buffer, dev->nDataBytesPerChunk);
+#ifdef CONFIG_YAFFS_WINCE
+			yfsd_LockYAFFS(TRUE);
+#endif
+			chunkWritten =
+			    yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
+							 dev->nDataBytesPerChunk,
+							 0);
+			yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
+#else
+			/* A full chunk. Write directly from the supplied buffer. */
+			chunkWritten =
+			    yaffs_WriteChunkDataToObject(in, chunk, buffer,
+							 dev->nDataBytesPerChunk,
+							 0);
+#endif
+			/* Since we've overwritten the cached data, we better invalidate it. */
+			yaffs_InvalidateChunkCache(in, chunk);
+		}
+
+		if (chunkWritten >= 0) {
+			n -= nToCopy;
+			offset += nToCopy;
+			buffer += nToCopy;
+			nDone += nToCopy;
+		}
+
+	}
+
+	/* Update file object */
+
+	if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
+		in->variant.fileVariant.fileSize = (startOfWrite + nDone);
+	}
+
+	in->dirty = 1;
+
+	return nDone;
+}
+
+
+/* ---------------------- File resizing stuff ------------------ */
+
+static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
+{
+
+	yaffs_Device *dev = in->myDev;
+	int oldFileSize = in->variant.fileVariant.fileSize;
+
+	int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
+
+	int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
+	    dev->nDataBytesPerChunk;
+	int i;
+	int chunkId;
+
+	/* Delete backwards so that we don't end up with holes if
+	 * power is lost part-way through the operation.
+	 */
+	for (i = lastDel; i >= startDel; i--) {
+		/* NB this could be optimised somewhat,
+		 * eg. could retrieve the tags and write them without
+		 * using yaffs_DeleteChunk
+		 */
+
+		chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
+		if (chunkId > 0) {
+			if (chunkId <
+			    (dev->internalStartBlock * dev->nChunksPerBlock)
+			    || chunkId >=
+			    ((dev->internalEndBlock +
+			      1) * dev->nChunksPerBlock)) {
+				T(YAFFS_TRACE_ALWAYS,
+				  (TSTR("Found daft chunkId %d for %d" TENDSTR),
+				   chunkId, i));
+			} else {
+				in->nDataChunks--;
+				yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
+			}
+		}
+	}
+
+}
+
+int yaffs_ResizeFile(yaffs_Object * in, loff_t newSize)
+{
+
+	int oldFileSize = in->variant.fileVariant.fileSize;
+	int newSizeOfPartialChunk;
+	int newFullChunks;
+	
+	yaffs_Device *dev = in->myDev;
+
+	yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
+
+	yaffs_FlushFilesChunkCache(in);
+	yaffs_InvalidateWholeChunkCache(in);
+
+	yaffs_CheckGarbageCollection(dev);
+
+	if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
+		return yaffs_GetFileSize(in);
+	}
+
+	if (newSize == oldFileSize) {
+		return oldFileSize;
+	}
+
+	if (newSize < oldFileSize) {
+
+		yaffs_PruneResizedChunks(in, newSize);
+
+		if (newSizeOfPartialChunk != 0) {
+			int lastChunk = 1 + newFullChunks;
+			
+			__u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
+
+			/* Got to read and rewrite the last chunk with its new size and zero pad */
+			yaffs_ReadChunkDataFromObject(in, lastChunk,
+						      localBuffer);
+
+			memset(localBuffer + newSizeOfPartialChunk, 0,
+			       dev->nDataBytesPerChunk - newSizeOfPartialChunk);
+
+			yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
+						     newSizeOfPartialChunk, 1);
+
+			yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
+		}
+
+		in->variant.fileVariant.fileSize = newSize;
+
+		yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
+	} else {
+		/* newsSize > oldFileSize */
+		in->variant.fileVariant.fileSize = newSize;
+	}
+
+		
+	
+	/* Write a new object header.
+	 * show we've shrunk the file, if need be
+	 * Do this only if the file is not in the deleted directories.
+	 */
+	if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
+	    in->parent->objectId != YAFFS_OBJECTID_DELETED) {
+		yaffs_UpdateObjectHeader(in, NULL, 0,
+					 (newSize < oldFileSize) ? 1 : 0, 0);
+	}
+
+	return newSize;
+}
+
+loff_t yaffs_GetFileSize(yaffs_Object * obj)
+{
+	obj = yaffs_GetEquivalentObject(obj);
+
+	switch (obj->variantType) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		return obj->variant.fileVariant.fileSize;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		return yaffs_strlen(obj->variant.symLinkVariant.alias);
+	default:
+		return 0;
+	}
+}
+
+
+
+int yaffs_FlushFile(yaffs_Object * in, int updateTime)
+{
+	int retVal;
+	if (in->dirty) {
+		yaffs_FlushFilesChunkCache(in);
+		if (updateTime) {
+#ifdef CONFIG_YAFFS_WINCE
+			yfsd_WinFileTimeNow(in->win_mtime);
+#else
+
+			in->yst_mtime = Y_CURRENT_TIME;
+
+#endif
+		}
+
+		retVal =
+		    (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
+		     0) ? YAFFS_OK : YAFFS_FAIL;
+	} else {
+		retVal = YAFFS_OK;
+	}
+
+	return retVal;
+
+}
+
+static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
+{
+
+	/* First off, invalidate the file's data in the cache, without flushing. */
+	yaffs_InvalidateWholeChunkCache(in);
+
+	if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
+		/* Move to the unlinked directory so we have a record that it was deleted. */
+		yaffs_ChangeObjectName(in, in->myDev->deletedDir,"deleted", 0, 0);
+
+	}
+
+	yaffs_RemoveObjectFromDirectory(in);
+	yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
+	in->chunkId = -1;
+
+	yaffs_FreeObject(in);
+	return YAFFS_OK;
+
+}
+
+/* yaffs_DeleteFile deletes the whole file data
+ * and the inode associated with the file.
+ * It does not delete the links associated with the file.
+ */
+static int yaffs_UnlinkFile(yaffs_Object * in)
+{
+
+	int retVal;
+	int immediateDeletion = 0;
+
+	if (1) {
+#ifdef __KERNEL__
+		if (!in->myInode) {
+			immediateDeletion = 1;
+
+		}
+#else
+		if (in->inUse <= 0) {
+			immediateDeletion = 1;
+
+		}
+#endif
+		if (immediateDeletion) {
+			retVal =
+			    yaffs_ChangeObjectName(in, in->myDev->deletedDir,
+						   "deleted", 0, 0);
+			T(YAFFS_TRACE_TRACING,
+			  (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
+			   in->objectId));
+			in->deleted = 1;
+			in->myDev->nDeletedFiles++;
+			if (0 && in->myDev->isYaffs2) {
+				yaffs_ResizeFile(in, 0);
+			}
+			yaffs_SoftDeleteFile(in);
+		} else {
+			retVal =
+			    yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
+						   "unlinked", 0, 0);
+		}
+
+	}
+	return retVal;
+}
+
+int yaffs_DeleteFile(yaffs_Object * in)
+{
+	int retVal = YAFFS_OK;
+
+	if (in->nDataChunks > 0) {
+		/* Use soft deletion if there is data in the file */
+		if (!in->unlinked) {
+			retVal = yaffs_UnlinkFile(in);
+		}
+		if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
+			in->deleted = 1;
+			in->myDev->nDeletedFiles++;
+			yaffs_SoftDeleteFile(in);
+		}
+		return in->deleted ? YAFFS_OK : YAFFS_FAIL;
+	} else {
+		/* The file has no data chunks so we toss it immediately */
+		yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
+		in->variant.fileVariant.top = NULL;
+		yaffs_DoGenericObjectDeletion(in);
+
+		return YAFFS_OK;
+	}
+}
+
+static int yaffs_DeleteDirectory(yaffs_Object * in)
+{
+	/* First check that the directory is empty. */
+	if (list_empty(&in->variant.directoryVariant.children)) {
+		return yaffs_DoGenericObjectDeletion(in);
+	}
+
+	return YAFFS_FAIL;
+
+}
+
+static int yaffs_DeleteSymLink(yaffs_Object * in)
+{
+	YFREE(in->variant.symLinkVariant.alias);
+
+	return yaffs_DoGenericObjectDeletion(in);
+}
+
+static int yaffs_DeleteHardLink(yaffs_Object * in)
+{
+	/* remove this hardlink from the list assocaited with the equivalent
+	 * object
+	 */
+	list_del(&in->hardLinks);
+	return yaffs_DoGenericObjectDeletion(in);
+}
+
+static void yaffs_DestroyObject(yaffs_Object * obj)
+{
+	switch (obj->variantType) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		yaffs_DeleteFile(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		yaffs_DeleteDirectory(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		yaffs_DeleteSymLink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		yaffs_DeleteHardLink(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		yaffs_DoGenericObjectDeletion(obj);
+		break;
+	case YAFFS_OBJECT_TYPE_UNKNOWN:
+		break;		/* should not happen. */
+	}
+}
+
+static int yaffs_UnlinkWorker(yaffs_Object * obj)
+{
+
+	if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
+		return yaffs_DeleteHardLink(obj);
+	} else if (!list_empty(&obj->hardLinks)) {
+		/* Curve ball: We're unlinking an object that has a hardlink.
+		 *
+		 * This problem arises because we are not strictly following
+		 * The Linux link/inode model.
+		 *
+		 * We can't really delete the object.
+		 * Instead, we do the following:
+		 * - Select a hardlink.
+		 * - Unhook it from the hard links
+		 * - Unhook it from its parent directory (so that the rename can work)
+		 * - Rename the object to the hardlink's name.
+		 * - Delete the hardlink
+		 */
+
+		yaffs_Object *hl;
+		int retVal;
+		YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+
+		hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
+
+		list_del_init(&hl->hardLinks);
+		list_del_init(&hl->siblings);
+
+		yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
+
+		retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
+
+		if (retVal == YAFFS_OK) {
+			retVal = yaffs_DoGenericObjectDeletion(hl);
+		}
+		return retVal;
+
+	} else {
+		switch (obj->variantType) {
+		case YAFFS_OBJECT_TYPE_FILE:
+			return yaffs_UnlinkFile(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_DIRECTORY:
+			return yaffs_DeleteDirectory(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_SYMLINK:
+			return yaffs_DeleteSymLink(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_SPECIAL:
+			return yaffs_DoGenericObjectDeletion(obj);
+			break;
+		case YAFFS_OBJECT_TYPE_HARDLINK:
+		case YAFFS_OBJECT_TYPE_UNKNOWN:
+		default:
+			return YAFFS_FAIL;
+		}
+	}
+}
+
+
+static int yaffs_UnlinkObject( yaffs_Object *obj)
+{
+
+	if (obj && obj->unlinkAllowed) {
+		return yaffs_UnlinkWorker(obj);
+	}
+
+	return YAFFS_FAIL;
+
+}
+int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
+{
+	yaffs_Object *obj;
+
+	obj = yaffs_FindObjectByName(dir, name);
+	return yaffs_UnlinkObject(obj);
+}
+
+/*----------------------- Initialisation Scanning ---------------------- */
+
+static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
+				       int backwardScanning)
+{
+	yaffs_Object *obj;
+
+	if (!backwardScanning) {
+		/* Handle YAFFS1 forward scanning case
+		 * For YAFFS1 we always do the deletion
+		 */
+
+	} else {
+		/* Handle YAFFS2 case (backward scanning)
+		 * If the shadowed object exists then ignore.
+		 */
+		if (yaffs_FindObjectByNumber(dev, objId)) {
+			return;
+		}
+	}
+
+	/* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
+	 * We put it in unlinked dir to be cleaned up after the scanning
+	 */
+	obj =
+	    yaffs_FindOrCreateObjectByNumber(dev, objId,
+					     YAFFS_OBJECT_TYPE_FILE);
+	yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
+	obj->variant.fileVariant.shrinkSize = 0;
+	obj->valid = 1;		/* So that we don't read any other info for this file */
+
+}
+
+typedef struct {
+	int seq;
+	int block;
+} yaffs_BlockIndex;
+
+
+static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
+{
+	yaffs_Object *hl;
+	yaffs_Object *in;
+	
+	while (hardList) {
+		hl = hardList;
+		hardList = (yaffs_Object *) (hardList->hardLinks.next);
+
+		in = yaffs_FindObjectByNumber(dev,
+					      hl->variant.hardLinkVariant.
+					      equivalentObjectId);
+
+		if (in) {
+			/* Add the hardlink pointers */
+			hl->variant.hardLinkVariant.equivalentObject = in;
+			list_add(&hl->hardLinks, &in->hardLinks);
+		} else {
+			/* Todo Need to report/handle this better.
+			 * Got a problem... hardlink to a non-existant object
+			 */
+			hl->variant.hardLinkVariant.equivalentObject = NULL;
+			INIT_LIST_HEAD(&hl->hardLinks);
+
+		}
+
+	}
+
+}
+
+
+
+
+
+static int ybicmp(const void *a, const void *b){
+    register int aseq = ((yaffs_BlockIndex *)a)->seq;
+    register int bseq = ((yaffs_BlockIndex *)b)->seq;
+    register int ablock = ((yaffs_BlockIndex *)a)->block;
+    register int bblock = ((yaffs_BlockIndex *)b)->block;
+    if( aseq == bseq )
+        return ablock - bblock;
+    else
+        return aseq - bseq;
+
+}
+
+static int yaffs_Scan(yaffs_Device * dev)
+{
+	yaffs_ExtendedTags tags;
+	int blk;
+	int blockIterator;
+	int startIterator;
+	int endIterator;
+	int nBlocksToScan = 0;
+	int result;
+
+	int chunk;
+	int c;
+	int deleted;
+	yaffs_BlockState state;
+	yaffs_Object *hardList = NULL;
+	yaffs_BlockInfo *bi;
+	int sequenceNumber;
+	yaffs_ObjectHeader *oh;
+	yaffs_Object *in;
+	yaffs_Object *parent;
+	int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+	
+	int alloc_failed = 0;
+	
+
+	__u8 *chunkData;
+
+	yaffs_BlockIndex *blockIndex = NULL;
+
+	if (dev->isYaffs2) {
+		T(YAFFS_TRACE_SCAN,
+		  (TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+	
+	//TODO  Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format.
+	
+	T(YAFFS_TRACE_SCAN,
+	  (TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
+	   dev->internalStartBlock, dev->internalEndBlock));
+
+	chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+
+	dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+	if (dev->isYaffs2) {
+		blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
+		if(!blockIndex)
+			return YAFFS_FAIL;
+	}
+
+	/* Scan all the blocks to determine their state */
+	for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
+		bi = yaffs_GetBlockInfo(dev, blk);
+		yaffs_ClearChunkBits(dev, blk);
+		bi->pagesInUse = 0;
+		bi->softDeletions = 0;
+
+		yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
+
+		bi->blockState = state;
+		bi->sequenceNumber = sequenceNumber;
+
+		T(YAFFS_TRACE_SCAN_DEBUG,
+		  (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
+		   state, sequenceNumber));
+
+		if (state == YAFFS_BLOCK_STATE_DEAD) {
+			T(YAFFS_TRACE_BAD_BLOCKS,
+			  (TSTR("block %d is bad" TENDSTR), blk));
+		} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+			T(YAFFS_TRACE_SCAN_DEBUG,
+			  (TSTR("Block empty " TENDSTR)));
+			dev->nErasedBlocks++;
+			dev->nFreeChunks += dev->nChunksPerBlock;
+		} else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+
+			/* Determine the highest sequence number */
+			if (dev->isYaffs2 &&
+			    sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
+			    sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
+
+				blockIndex[nBlocksToScan].seq = sequenceNumber;
+				blockIndex[nBlocksToScan].block = blk;
+
+				nBlocksToScan++;
+
+				if (sequenceNumber >= dev->sequenceNumber) {
+					dev->sequenceNumber = sequenceNumber;
+				}
+			} else if (dev->isYaffs2) {
+				/* TODO: Nasty sequence number! */
+				T(YAFFS_TRACE_SCAN,
+				  (TSTR
+				   ("Block scanning block %d has bad sequence number %d"
+				    TENDSTR), blk, sequenceNumber));
+
+			}
+		}
+	}
+
+	/* Sort the blocks
+	 * Dungy old bubble sort for now...
+	 */
+	if (dev->isYaffs2) {
+		yaffs_BlockIndex temp;
+		int i;
+		int j;
+
+		for (i = 0; i < nBlocksToScan; i++)
+			for (j = i + 1; j < nBlocksToScan; j++)
+				if (blockIndex[i].seq > blockIndex[j].seq) {
+					temp = blockIndex[j];
+					blockIndex[j] = blockIndex[i];
+					blockIndex[i] = temp;
+				}
+	}
+
+	/* Now scan the blocks looking at the data. */
+	if (dev->isYaffs2) {
+		startIterator = 0;
+		endIterator = nBlocksToScan - 1;
+		T(YAFFS_TRACE_SCAN_DEBUG,
+		  (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
+	} else {
+		startIterator = dev->internalStartBlock;
+		endIterator = dev->internalEndBlock;
+	}
+
+	/* For each block.... */
+	for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
+	     blockIterator++) {
+
+		if (dev->isYaffs2) {
+			/* get the block to scan in the correct order */
+			blk = blockIndex[blockIterator].block;
+		} else {
+			blk = blockIterator;
+		}
+
+		bi = yaffs_GetBlockInfo(dev, blk);
+		state = bi->blockState;
+
+		deleted = 0;
+
+		/* For each chunk in each block that needs scanning....*/
+		for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
+		     state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
+			/* Read the tags and decide what to do */
+			chunk = blk * dev->nChunksPerBlock + c;
+
+			result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
+							&tags);
+
+			/* Let's have a good look at this chunk... */
+
+			if (!dev->isYaffs2 && tags.chunkDeleted) {
+				/* YAFFS1 only...
+				 * A deleted chunk
+				 */
+				deleted++;
+				dev->nFreeChunks++;
+				/*T((" %d %d deleted\n",blk,c)); */
+			} else if (!tags.chunkUsed) {
+				/* An unassigned chunk in the block
+				 * This means that either the block is empty or 
+				 * this is the one being allocated from
+				 */
+
+				if (c == 0) {
+					/* We're looking at the first chunk in the block so the block is unused */
+					state = YAFFS_BLOCK_STATE_EMPTY;
+					dev->nErasedBlocks++;
+				} else {
+					/* this is the block being allocated from */
+					T(YAFFS_TRACE_SCAN,
+					  (TSTR
+					   (" Allocating from %d %d" TENDSTR),
+					   blk, c));
+					state = YAFFS_BLOCK_STATE_ALLOCATING;
+					dev->allocationBlock = blk;
+					dev->allocationPage = c;
+					dev->allocationBlockFinder = blk;	
+					/* Set it to here to encourage the allocator to go forth from here. */
+					
+					/* Yaffs2 sanity check:
+					 * This should be the one with the highest sequence number
+					 */
+					if (dev->isYaffs2
+					    && (dev->sequenceNumber !=
+						bi->sequenceNumber)) {
+						T(YAFFS_TRACE_ALWAYS,
+						  (TSTR
+						   ("yaffs: Allocation block %d was not highest sequence id:"
+						    " block seq = %d, dev seq = %d"
+						    TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
+					}
+				}
+
+				dev->nFreeChunks += (dev->nChunksPerBlock - c);
+			} else if (tags.chunkId > 0) {
+				/* chunkId > 0 so it is a data chunk... */
+				unsigned int endpos;
+
+				yaffs_SetChunkBit(dev, blk, c);
+				bi->pagesInUse++;
+
+				in = yaffs_FindOrCreateObjectByNumber(dev,
+								      tags.
+								      objectId,
+								      YAFFS_OBJECT_TYPE_FILE);
+				/* PutChunkIntoFile checks for a clash (two data chunks with
+				 * the same chunkId).
+				 */
+				 
+				if(!in)
+					alloc_failed = 1;
+
+				if(in){
+					if(!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,1))
+						alloc_failed = 1;
+				}
+				
+				endpos =
+				    (tags.chunkId - 1) * dev->nDataBytesPerChunk +
+				    tags.byteCount;
+				if (in && 
+				    in->variantType == YAFFS_OBJECT_TYPE_FILE
+				    && in->variant.fileVariant.scannedFileSize <
+				    endpos) {
+					in->variant.fileVariant.
+					    scannedFileSize = endpos;
+					if (!dev->useHeaderFileSize) {
+						in->variant.fileVariant.
+						    fileSize =
+						    in->variant.fileVariant.
+						    scannedFileSize;
+					}
+
+				}
+				/* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
+			} else {
+				/* chunkId == 0, so it is an ObjectHeader.
+				 * Thus, we read in the object header and make the object
+				 */
+				yaffs_SetChunkBit(dev, blk, c);
+				bi->pagesInUse++;
+
+				result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
+								chunkData,
+								NULL);
+
+				oh = (yaffs_ObjectHeader *) chunkData;
+
+				in = yaffs_FindObjectByNumber(dev,
+							      tags.objectId);
+				if (in && in->variantType != oh->type) {
+					/* This should not happen, but somehow
+					 * Wev'e ended up with an objectId that has been reused but not yet 
+					 * deleted, and worse still it has changed type. Delete the old object.
+					 */
+
+					yaffs_DestroyObject(in);
+
+					in = 0;
+				}
+
+				in = yaffs_FindOrCreateObjectByNumber(dev,
+								      tags.
+								      objectId,
+								      oh->type);
+
+				if(!in)
+					alloc_failed = 1;
+					
+				if (in && oh->shadowsObject > 0) {
+					yaffs_HandleShadowedObject(dev,
+								   oh->
+								   shadowsObject,
+								   0);
+				}
+
+				if (in && in->valid) {
+					/* We have already filled this one. We have a duplicate and need to resolve it. */
+
+					unsigned existingSerial = in->serial;
+					unsigned newSerial = tags.serialNumber;
+
+					if (dev->isYaffs2 ||
+					    ((existingSerial + 1) & 3) ==
+					    newSerial) {
+						/* Use new one - destroy the exisiting one */
+						yaffs_DeleteChunk(dev,
+								  in->chunkId,
+								  1, __LINE__);
+						in->valid = 0;
+					} else {
+						/* Use existing - destroy this one. */
+						yaffs_DeleteChunk(dev, chunk, 1,
+								  __LINE__);
+					}
+				}
+
+				if (in && !in->valid &&
+				    (tags.objectId == YAFFS_OBJECTID_ROOT ||
+				     tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
+					/* We only load some info, don't fiddle with directory structure */
+					in->valid = 1;
+					in->variantType = oh->type;
+
+					in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+					in->win_atime[0] = oh->win_atime[0];
+					in->win_ctime[0] = oh->win_ctime[0];
+					in->win_mtime[0] = oh->win_mtime[0];
+					in->win_atime[1] = oh->win_atime[1];
+					in->win_ctime[1] = oh->win_ctime[1];
+					in->win_mtime[1] = oh->win_mtime[1];
+#else
+					in->yst_uid = oh->yst_uid;
+					in->yst_gid = oh->yst_gid;
+					in->yst_atime = oh->yst_atime;
+					in->yst_mtime = oh->yst_mtime;
+					in->yst_ctime = oh->yst_ctime;
+					in->yst_rdev = oh->yst_rdev;
+#endif
+					in->chunkId = chunk;
+
+				} else if (in && !in->valid) {
+					/* we need to load this info */
+
+					in->valid = 1;
+					in->variantType = oh->type;
+
+					in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+					in->win_atime[0] = oh->win_atime[0];
+					in->win_ctime[0] = oh->win_ctime[0];
+					in->win_mtime[0] = oh->win_mtime[0];
+					in->win_atime[1] = oh->win_atime[1];
+					in->win_ctime[1] = oh->win_ctime[1];
+					in->win_mtime[1] = oh->win_mtime[1];
+#else
+					in->yst_uid = oh->yst_uid;
+					in->yst_gid = oh->yst_gid;
+					in->yst_atime = oh->yst_atime;
+					in->yst_mtime = oh->yst_mtime;
+					in->yst_ctime = oh->yst_ctime;
+					in->yst_rdev = oh->yst_rdev;
+#endif
+					in->chunkId = chunk;
+
+					yaffs_SetObjectName(in, oh->name);
+					in->dirty = 0;
+
+					/* directory stuff...
+					 * hook up to parent
+					 */
+
+					parent =
+					    yaffs_FindOrCreateObjectByNumber
+					    (dev, oh->parentObjectId,
+					     YAFFS_OBJECT_TYPE_DIRECTORY);
+					if (parent->variantType ==
+					    YAFFS_OBJECT_TYPE_UNKNOWN) {
+						/* Set up as a directory */
+						parent->variantType =
+						    YAFFS_OBJECT_TYPE_DIRECTORY;
+						INIT_LIST_HEAD(&parent->variant.
+							       directoryVariant.
+							       children);
+					} else if (parent->variantType !=
+						   YAFFS_OBJECT_TYPE_DIRECTORY)
+					{
+						/* Hoosterman, another problem....
+						 * We're trying to use a non-directory as a directory
+						 */
+
+						T(YAFFS_TRACE_ERROR,
+						  (TSTR
+						   ("yaffs tragedy: attempting to use non-directory as"
+						    " a directory in scan. Put in lost+found."
+						    TENDSTR)));
+						parent = dev->lostNFoundDir;
+					}
+
+					yaffs_AddObjectToDirectory(parent, in);
+
+					if (0 && (parent == dev->deletedDir ||
+						  parent == dev->unlinkedDir)) {
+						in->deleted = 1;	/* If it is unlinked at start up then it wants deleting */
+						dev->nDeletedFiles++;
+					}
+					/* Note re hardlinks.
+					 * Since we might scan a hardlink before its equivalent object is scanned
+					 * we put them all in a list.
+					 * After scanning is complete, we should have all the objects, so we run through this
+					 * list and fix up all the chains.              
+					 */
+
+					switch (in->variantType) {
+					case YAFFS_OBJECT_TYPE_UNKNOWN:	
+						/* Todo got a problem */
+						break;
+					case YAFFS_OBJECT_TYPE_FILE:
+						if (dev->isYaffs2
+						    && oh->isShrink) {
+							/* Prune back the shrunken chunks */
+							yaffs_PruneResizedChunks
+							    (in, oh->fileSize);
+							/* Mark the block as having a shrinkHeader */
+							bi->hasShrinkHeader = 1;
+						}
+
+						if (dev->useHeaderFileSize)
+
+							in->variant.fileVariant.
+							    fileSize =
+							    oh->fileSize;
+
+						break;
+					case YAFFS_OBJECT_TYPE_HARDLINK:
+						in->variant.hardLinkVariant.
+						    equivalentObjectId =
+						    oh->equivalentObjectId;
+						in->hardLinks.next =
+						    (struct list_head *)
+						    hardList;
+						hardList = in;
+						break;
+					case YAFFS_OBJECT_TYPE_DIRECTORY:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SPECIAL:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SYMLINK:	
+						in->variant.symLinkVariant.alias =
+						    yaffs_CloneString(oh->alias);
+						if(!in->variant.symLinkVariant.alias)
+							alloc_failed = 1;
+						break;
+					}
+
+					if (parent == dev->deletedDir) {
+						yaffs_DestroyObject(in);
+						bi->hasShrinkHeader = 1;
+					}
+				}
+			}
+		}
+
+		if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+			/* If we got this far while scanning, then the block is fully allocated.*/
+			state = YAFFS_BLOCK_STATE_FULL;
+		}
+
+		bi->blockState = state;
+
+		/* Now let's see if it was dirty */
+		if (bi->pagesInUse == 0 &&
+		    !bi->hasShrinkHeader &&
+		    bi->blockState == YAFFS_BLOCK_STATE_FULL) {
+			yaffs_BlockBecameDirty(dev, blk);
+		}
+
+	}
+
+	if (blockIndex) {
+		YFREE(blockIndex);
+	}
+	
+	
+	/* Ok, we've done all the scanning.
+	 * Fix up the hard link chains.
+	 * We should now have scanned all the objects, now it's time to add these 
+	 * hardlinks.
+	 */
+
+	yaffs_HardlinkFixup(dev,hardList);
+
+	/* Handle the unlinked files. Since they were left in an unlinked state we should
+	 * just delete them.
+	 */
+	{
+		struct list_head *i;
+		struct list_head *n;
+
+		yaffs_Object *l;
+		/* Soft delete all the unlinked files */
+		list_for_each_safe(i, n,
+				   &dev->unlinkedDir->variant.directoryVariant.
+				   children) {
+			if (i) {
+				l = list_entry(i, yaffs_Object, siblings);
+				yaffs_DestroyObject(l);
+			}
+		}
+	}
+
+	yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+
+	if(alloc_failed){
+		return YAFFS_FAIL;
+	}
+	
+	T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
+	
+
+	return YAFFS_OK;
+}
+
+static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
+{
+	__u8 *chunkData;
+	yaffs_ObjectHeader *oh;
+	yaffs_Device *dev = in->myDev;
+	yaffs_ExtendedTags tags;
+	int result;
+	int alloc_failed = 0;
+
+	if(!in)
+		return;
+		
+#if 0
+	T(YAFFS_TRACE_SCAN,(TSTR("details for object %d %s loaded" TENDSTR),
+		in->objectId,
+		in->lazyLoaded ? "not yet" : "already"));
+#endif
+
+	if(in->lazyLoaded){
+		in->lazyLoaded = 0;
+		chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+
+		result = yaffs_ReadChunkWithTagsFromNAND(dev,in->chunkId,chunkData,&tags);
+		oh = (yaffs_ObjectHeader *) chunkData;		
+
+		in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+		in->win_atime[0] = oh->win_atime[0];
+		in->win_ctime[0] = oh->win_ctime[0];
+		in->win_mtime[0] = oh->win_mtime[0];
+		in->win_atime[1] = oh->win_atime[1];
+		in->win_ctime[1] = oh->win_ctime[1];
+		in->win_mtime[1] = oh->win_mtime[1];
+#else
+		in->yst_uid = oh->yst_uid;
+		in->yst_gid = oh->yst_gid;
+		in->yst_atime = oh->yst_atime;
+		in->yst_mtime = oh->yst_mtime;
+		in->yst_ctime = oh->yst_ctime;
+		in->yst_rdev = oh->yst_rdev;
+		
+#endif
+		yaffs_SetObjectName(in, oh->name);
+		
+		if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
+			 in->variant.symLinkVariant.alias =
+						    yaffs_CloneString(oh->alias);
+			if(!in->variant.symLinkVariant.alias)
+				alloc_failed = 1; /* Not returned to caller */
+		}
+						    
+		yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
+	}
+}
+
+static int yaffs_ScanBackwards(yaffs_Device * dev)
+{
+	yaffs_ExtendedTags tags;
+	int blk;
+	int blockIterator;
+	int startIterator;
+	int endIterator;
+	int nBlocksToScan = 0;
+
+	int chunk;
+	int result;
+	int c;
+	int deleted;
+	yaffs_BlockState state;
+	yaffs_Object *hardList = NULL;
+	yaffs_BlockInfo *bi;
+	int sequenceNumber;
+	yaffs_ObjectHeader *oh;
+	yaffs_Object *in;
+	yaffs_Object *parent;
+	int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+	int itsUnlinked;
+	__u8 *chunkData;
+	
+	int fileSize;
+	int isShrink;
+	int foundChunksInBlock;
+	int equivalentObjectId;
+	int alloc_failed = 0;
+	
+
+	yaffs_BlockIndex *blockIndex = NULL;
+	int altBlockIndex = 0;
+
+	if (!dev->isYaffs2) {
+		T(YAFFS_TRACE_SCAN,
+		  (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	T(YAFFS_TRACE_SCAN,
+	  (TSTR
+	   ("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..."
+	    TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
+
+
+	dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+	blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
+	
+	if(!blockIndex) {
+		blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
+		altBlockIndex = 1;
+	}
+	
+	if(!blockIndex) {
+		T(YAFFS_TRACE_SCAN,
+		  (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+	
+	dev->blocksInCheckpoint = 0;
+	
+	chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+
+	/* Scan all the blocks to determine their state */
+	for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
+		bi = yaffs_GetBlockInfo(dev, blk);
+		yaffs_ClearChunkBits(dev, blk);
+		bi->pagesInUse = 0;
+		bi->softDeletions = 0;
+
+		yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
+
+		bi->blockState = state;
+		bi->sequenceNumber = sequenceNumber;
+
+		if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
+			bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
+			
+		T(YAFFS_TRACE_SCAN_DEBUG,
+		  (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
+		   state, sequenceNumber));
+
+		
+		if(state == YAFFS_BLOCK_STATE_CHECKPOINT){
+			dev->blocksInCheckpoint++;
+			
+		} else if (state == YAFFS_BLOCK_STATE_DEAD) {
+			T(YAFFS_TRACE_BAD_BLOCKS,
+			  (TSTR("block %d is bad" TENDSTR), blk));
+		} else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+			T(YAFFS_TRACE_SCAN_DEBUG,
+			  (TSTR("Block empty " TENDSTR)));
+			dev->nErasedBlocks++;
+			dev->nFreeChunks += dev->nChunksPerBlock;
+		} else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+
+			/* Determine the highest sequence number */
+			if (dev->isYaffs2 &&
+			    sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
+			    sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
+
+				blockIndex[nBlocksToScan].seq = sequenceNumber;
+				blockIndex[nBlocksToScan].block = blk;
+
+				nBlocksToScan++;
+
+				if (sequenceNumber >= dev->sequenceNumber) {
+					dev->sequenceNumber = sequenceNumber;
+				}
+			} else if (dev->isYaffs2) {
+				/* TODO: Nasty sequence number! */
+				T(YAFFS_TRACE_SCAN,
+				  (TSTR
+				   ("Block scanning block %d has bad sequence number %d"
+				    TENDSTR), blk, sequenceNumber));
+
+			}
+		}
+	}
+
+	T(YAFFS_TRACE_SCAN,
+	(TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
+
+
+
+	YYIELD();
+
+	/* Sort the blocks */
+#ifndef CONFIG_YAFFS_USE_OWN_SORT
+	yaffs_qsort(blockIndex, nBlocksToScan,
+		sizeof(yaffs_BlockIndex), ybicmp);
+#else
+	{
+	 	/* Dungy old bubble sort... */
+	 	
+		yaffs_BlockIndex temp;
+		int i;
+		int j;
+
+		for (i = 0; i < nBlocksToScan; i++)
+			for (j = i + 1; j < nBlocksToScan; j++)
+				if (blockIndex[i].seq > blockIndex[j].seq) {
+					temp = blockIndex[j];
+					blockIndex[j] = blockIndex[i];
+					blockIndex[i] = temp;
+				}
+	}
+#endif
+
+	YYIELD();
+
+    	T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
+
+	/* Now scan the blocks looking at the data. */
+	startIterator = 0;
+	endIterator = nBlocksToScan - 1;
+	T(YAFFS_TRACE_SCAN_DEBUG,
+	  (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
+
+	/* For each block.... backwards */
+	for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
+	     blockIterator--) {
+	        /* Cooperative multitasking! This loop can run for so
+		   long that watchdog timers expire. */
+	        YYIELD();
+
+		/* get the block to scan in the correct order */
+		blk = blockIndex[blockIterator].block;
+
+		bi = yaffs_GetBlockInfo(dev, blk);
+		
+		
+		state = bi->blockState;
+
+		deleted = 0;
+
+		/* For each chunk in each block that needs scanning.... */
+		foundChunksInBlock = 0;
+		for (c = dev->nChunksPerBlock - 1; 
+		     !alloc_failed && c >= 0 &&
+		     (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+		      state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
+			/* Scan backwards... 
+			 * Read the tags and decide what to do
+			 */
+			
+			chunk = blk * dev->nChunksPerBlock + c;
+
+			result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
+							&tags);
+
+			/* Let's have a good look at this chunk... */
+
+			if (!tags.chunkUsed) {
+				/* An unassigned chunk in the block.
+				 * If there are used chunks after this one, then
+				 * it is a chunk that was skipped due to failing the erased
+				 * check. Just skip it so that it can be deleted.
+				 * But, more typically, We get here when this is an unallocated
+				 * chunk and his means that either the block is empty or 
+				 * this is the one being allocated from
+				 */
+
+				if(foundChunksInBlock)
+				{
+					/* This is a chunk that was skipped due to failing the erased check */
+					
+				} else if (c == 0) {
+					/* We're looking at the first chunk in the block so the block is unused */
+					state = YAFFS_BLOCK_STATE_EMPTY;
+					dev->nErasedBlocks++;
+				} else {
+					if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+					    state == YAFFS_BLOCK_STATE_ALLOCATING) {
+					    	if(dev->sequenceNumber == bi->sequenceNumber) {
+							/* this is the block being allocated from */
+					    	
+							T(YAFFS_TRACE_SCAN,
+							  (TSTR
+							   (" Allocating from %d %d"
+							    TENDSTR), blk, c));
+
+							state = YAFFS_BLOCK_STATE_ALLOCATING;
+							dev->allocationBlock = blk;
+							dev->allocationPage = c;
+							dev->allocationBlockFinder = blk;	
+						}
+						else {
+							/* This is a partially written block that is not
+							 * the current allocation block. This block must have
+							 * had a write failure, so set up for retirement.
+							 */
+						  
+							 bi->needsRetiring = 1;
+							 bi->gcPrioritise = 1;
+							 						 
+							 T(YAFFS_TRACE_ALWAYS,
+							 (TSTR("Partially written block %d being set for retirement" TENDSTR),
+							 blk));
+						}
+
+					}
+					 
+				}
+
+				dev->nFreeChunks++;
+				
+			} else if (tags.chunkId > 0) {
+				/* chunkId > 0 so it is a data chunk... */
+				unsigned int endpos;
+				__u32 chunkBase =
+				    (tags.chunkId - 1) * dev->nDataBytesPerChunk;
+								
+				foundChunksInBlock = 1;
+
+
+				yaffs_SetChunkBit(dev, blk, c);
+				bi->pagesInUse++;
+
+				in = yaffs_FindOrCreateObjectByNumber(dev,
+								      tags.
+								      objectId,
+								      YAFFS_OBJECT_TYPE_FILE);
+				if(!in){
+					/* Out of memory */
+					alloc_failed = 1;
+				}
+				
+				if (in &&
+				    in->variantType == YAFFS_OBJECT_TYPE_FILE
+				    && chunkBase <
+				    in->variant.fileVariant.shrinkSize) {
+					/* This has not been invalidated by a resize */
+					if(!yaffs_PutChunkIntoFile(in, tags.chunkId,
+							       chunk, -1)){
+						alloc_failed = 1;
+					}
+
+					/* File size is calculated by looking at the data chunks if we have not 
+					 * seen an object header yet. Stop this practice once we find an object header.
+					 */
+					endpos =
+					    (tags.chunkId -
+					     1) * dev->nDataBytesPerChunk +
+					    tags.byteCount;
+					    
+					if (!in->valid &&	/* have not got an object header yet */
+					    in->variant.fileVariant.
+					    scannedFileSize < endpos) {
+						in->variant.fileVariant.
+						    scannedFileSize = endpos;
+						in->variant.fileVariant.
+						    fileSize =
+						    in->variant.fileVariant.
+						    scannedFileSize;
+					}
+
+				} else if(in) {
+					/* This chunk has been invalidated by a resize, so delete */
+					yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
+
+				}
+			} else {
+				/* chunkId == 0, so it is an ObjectHeader.
+				 * Thus, we read in the object header and make the object
+				 */
+				foundChunksInBlock = 1;
+
+				yaffs_SetChunkBit(dev, blk, c);
+				bi->pagesInUse++;
+
+				oh = NULL;
+				in = NULL;
+
+				if (tags.extraHeaderInfoAvailable) {
+					in = yaffs_FindOrCreateObjectByNumber
+					    (dev, tags.objectId,
+					     tags.extraObjectType);
+				}
+
+				if (!in ||
+#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
+				    !in->valid ||
+#endif
+				    tags.extraShadows ||
+				    (!in->valid &&
+				    (tags.objectId == YAFFS_OBJECTID_ROOT ||
+				     tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
+				    ) {
+
+					/* If we don't have  valid info then we need to read the chunk
+					 * TODO In future we can probably defer reading the chunk and 
+					 * living with invalid data until needed.
+					 */
+
+					result = yaffs_ReadChunkWithTagsFromNAND(dev,
+									chunk,
+									chunkData,
+									NULL);
+
+					oh = (yaffs_ObjectHeader *) chunkData;
+
+					if (!in)
+						in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
+
+				}
+
+				if (!in) {
+					/* TODO Hoosterman we have a problem! */
+					T(YAFFS_TRACE_ERROR,
+					  (TSTR
+					   ("yaffs tragedy: Could not make object for object  %d  "
+					    "at chunk %d during scan"
+					    TENDSTR), tags.objectId, chunk));
+
+				}
+
+				if (in->valid) {
+					/* We have already filled this one.
+					 * We have a duplicate that will be discarded, but 
+					 * we first have to suck out resize info if it is a file.
+					 */
+
+					if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) && 
+					     ((oh && 
+					       oh-> type == YAFFS_OBJECT_TYPE_FILE)||
+					      (tags.extraHeaderInfoAvailable  &&
+					       tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
+					    ) {
+						__u32 thisSize =
+						    (oh) ? oh->fileSize : tags.
+						    extraFileLength;
+						__u32 parentObjectId =
+						    (oh) ? oh->
+						    parentObjectId : tags.
+						    extraParentObjectId;
+						unsigned isShrink =
+						    (oh) ? oh->isShrink : tags.
+						    extraIsShrinkHeader;
+
+						/* If it is deleted (unlinked at start also means deleted)
+						 * we treat the file size as being zeroed at this point.
+						 */
+						if (parentObjectId ==
+						    YAFFS_OBJECTID_DELETED
+						    || parentObjectId ==
+						    YAFFS_OBJECTID_UNLINKED) {
+							thisSize = 0;
+							isShrink = 1;
+						}
+
+						if (isShrink &&
+						    in->variant.fileVariant.
+						    shrinkSize > thisSize) {
+							in->variant.fileVariant.
+							    shrinkSize =
+							    thisSize;
+						}
+
+						if (isShrink) {
+							bi->hasShrinkHeader = 1;
+						}
+
+					}
+					/* Use existing - destroy this one. */
+					yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
+
+				}
+
+				if (!in->valid &&
+				    (tags.objectId == YAFFS_OBJECTID_ROOT ||
+				     tags.objectId ==
+				     YAFFS_OBJECTID_LOSTNFOUND)) {
+					/* We only load some info, don't fiddle with directory structure */
+					in->valid = 1;
+					
+					if(oh) {
+						in->variantType = oh->type;
+
+						in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+						in->win_atime[0] = oh->win_atime[0];
+						in->win_ctime[0] = oh->win_ctime[0];
+						in->win_mtime[0] = oh->win_mtime[0];
+						in->win_atime[1] = oh->win_atime[1];
+						in->win_ctime[1] = oh->win_ctime[1];
+						in->win_mtime[1] = oh->win_mtime[1];
+#else
+						in->yst_uid = oh->yst_uid;
+						in->yst_gid = oh->yst_gid;
+						in->yst_atime = oh->yst_atime;
+						in->yst_mtime = oh->yst_mtime;
+						in->yst_ctime = oh->yst_ctime;
+						in->yst_rdev = oh->yst_rdev;
+		
+#endif
+					} else {
+						in->variantType = tags.extraObjectType;
+						in->lazyLoaded = 1;
+					}
+						
+					in->chunkId = chunk;
+
+				} else if (!in->valid) {
+					/* we need to load this info */
+
+					in->valid = 1;
+					in->chunkId = chunk;
+					
+					if(oh) {
+						in->variantType = oh->type;
+
+						in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+						in->win_atime[0] = oh->win_atime[0];
+						in->win_ctime[0] = oh->win_ctime[0];
+						in->win_mtime[0] = oh->win_mtime[0];
+						in->win_atime[1] = oh->win_atime[1];
+						in->win_ctime[1] = oh->win_ctime[1];
+						in->win_mtime[1] = oh->win_mtime[1];
+#else
+						in->yst_uid = oh->yst_uid;
+						in->yst_gid = oh->yst_gid;
+						in->yst_atime = oh->yst_atime;
+						in->yst_mtime = oh->yst_mtime;
+						in->yst_ctime = oh->yst_ctime;
+						in->yst_rdev = oh->yst_rdev;
+#endif
+
+						if (oh->shadowsObject > 0) 
+							yaffs_HandleShadowedObject(dev,
+									   oh->
+									   shadowsObject,
+									   1);
+					
+
+						yaffs_SetObjectName(in, oh->name);
+						parent =
+						    yaffs_FindOrCreateObjectByNumber
+					    		(dev, oh->parentObjectId,
+					     		 YAFFS_OBJECT_TYPE_DIRECTORY);
+
+						 fileSize = oh->fileSize;
+ 						 isShrink = oh->isShrink;
+						 equivalentObjectId = oh->equivalentObjectId;
+
+					}
+					else {
+						in->variantType = tags.extraObjectType;
+						parent =
+						    yaffs_FindOrCreateObjectByNumber
+					    		(dev, tags.extraParentObjectId,
+					     		 YAFFS_OBJECT_TYPE_DIRECTORY);
+						 fileSize = tags.extraFileLength;
+						 isShrink = tags.extraIsShrinkHeader;
+						 equivalentObjectId = tags.extraEquivalentObjectId;
+						in->lazyLoaded = 1;
+
+					}
+					in->dirty = 0;
+
+					/* directory stuff...
+					 * hook up to parent
+					 */
+
+					if (parent->variantType ==
+					    YAFFS_OBJECT_TYPE_UNKNOWN) {
+						/* Set up as a directory */
+						parent->variantType =
+						    YAFFS_OBJECT_TYPE_DIRECTORY;
+						INIT_LIST_HEAD(&parent->variant.
+							       directoryVariant.
+							       children);
+					} else if (parent->variantType !=
+						   YAFFS_OBJECT_TYPE_DIRECTORY)
+					{
+						/* Hoosterman, another problem....
+						 * We're trying to use a non-directory as a directory
+						 */
+
+						T(YAFFS_TRACE_ERROR,
+						  (TSTR
+						   ("yaffs tragedy: attempting to use non-directory as"
+						    " a directory in scan. Put in lost+found."
+						    TENDSTR)));
+						parent = dev->lostNFoundDir;
+					}
+
+					yaffs_AddObjectToDirectory(parent, in);
+
+					itsUnlinked = (parent == dev->deletedDir) ||
+						      (parent == dev->unlinkedDir);
+
+					if (isShrink) {
+						/* Mark the block as having a shrinkHeader */
+						bi->hasShrinkHeader = 1;
+					}
+
+					/* Note re hardlinks.
+					 * Since we might scan a hardlink before its equivalent object is scanned
+					 * we put them all in a list.
+					 * After scanning is complete, we should have all the objects, so we run
+					 * through this list and fix up all the chains.              
+					 */
+
+					switch (in->variantType) {
+					case YAFFS_OBJECT_TYPE_UNKNOWN:	
+						/* Todo got a problem */
+						break;
+					case YAFFS_OBJECT_TYPE_FILE:
+
+						if (in->variant.fileVariant.
+						    scannedFileSize < fileSize) {
+							/* This covers the case where the file size is greater
+							 * than where the data is
+							 * This will happen if the file is resized to be larger 
+							 * than its current data extents.
+							 */
+							in->variant.fileVariant.fileSize = fileSize;
+							in->variant.fileVariant.scannedFileSize =
+							    in->variant.fileVariant.fileSize;
+						}
+
+						if (isShrink &&
+						    in->variant.fileVariant.shrinkSize > fileSize) {
+							in->variant.fileVariant.shrinkSize = fileSize;
+						}
+
+						break;
+					case YAFFS_OBJECT_TYPE_HARDLINK:
+						if(!itsUnlinked) {
+						  in->variant.hardLinkVariant.equivalentObjectId =
+						    equivalentObjectId;
+						  in->hardLinks.next =
+						    (struct list_head *) hardList;
+						  hardList = in;
+						}
+						break;
+					case YAFFS_OBJECT_TYPE_DIRECTORY:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SPECIAL:
+						/* Do nothing */
+						break;
+					case YAFFS_OBJECT_TYPE_SYMLINK:
+						if(oh){
+						   in->variant.symLinkVariant.alias =
+						    yaffs_CloneString(oh->
+								      alias);
+						   if(!in->variant.symLinkVariant.alias)
+						   	alloc_failed = 1;
+						}
+						break;
+					}
+
+				}
+				
+			}
+
+		} /* End of scanning for each chunk */
+
+		if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+			/* If we got this far while scanning, then the block is fully allocated. */
+			state = YAFFS_BLOCK_STATE_FULL;
+		}
+
+		bi->blockState = state;
+
+		/* Now let's see if it was dirty */
+		if (bi->pagesInUse == 0 &&
+		    !bi->hasShrinkHeader &&
+		    bi->blockState == YAFFS_BLOCK_STATE_FULL) {
+			yaffs_BlockBecameDirty(dev, blk);
+		}
+
+	}
+
+	if (altBlockIndex) 
+		YFREE_ALT(blockIndex);
+	else
+		YFREE(blockIndex);
+	
+	/* Ok, we've done all the scanning.
+	 * Fix up the hard link chains.
+	 * We should now have scanned all the objects, now it's time to add these 
+	 * hardlinks.
+	 */
+	yaffs_HardlinkFixup(dev,hardList);
+	
+	
+	/*
+	*  Sort out state of unlinked and deleted objects.
+	*/
+	{
+		struct list_head *i;
+		struct list_head *n;
+
+		yaffs_Object *l;
+
+		/* Soft delete all the unlinked files */
+		list_for_each_safe(i, n,
+				   &dev->unlinkedDir->variant.directoryVariant.
+				   children) {
+			if (i) {
+				l = list_entry(i, yaffs_Object, siblings);
+				yaffs_DestroyObject(l);
+			}
+		}
+
+		/* Soft delete all the deletedDir files */
+		list_for_each_safe(i, n,
+				   &dev->deletedDir->variant.directoryVariant.
+				   children) {
+			if (i) {
+				l = list_entry(i, yaffs_Object, siblings);
+				yaffs_DestroyObject(l);
+
+			}
+		}
+	}
+
+	yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+	
+	if(alloc_failed){
+		return YAFFS_FAIL;
+	}
+
+	T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
+
+	return YAFFS_OK;
+}
+
+/*------------------------------  Directory Functions ----------------------------- */
+
+static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
+{
+	yaffs_Device *dev = obj->myDev;
+	
+	if(dev && dev->removeObjectCallback)
+		dev->removeObjectCallback(obj);
+	   
+	list_del_init(&obj->siblings);
+	obj->parent = NULL;
+}
+
+
+static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
+				       yaffs_Object * obj)
+{
+
+	if (!directory) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: Trying to add an object to a null pointer directory"
+		    TENDSTR)));
+		YBUG();
+	}
+	if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: Trying to add an object to a non-directory"
+		    TENDSTR)));
+		YBUG();
+	}
+
+	if (obj->siblings.prev == NULL) {
+		/* Not initialised */
+		INIT_LIST_HEAD(&obj->siblings);
+
+	} else if (!list_empty(&obj->siblings)) {
+		/* If it is holed up somewhere else, un hook it */
+		yaffs_RemoveObjectFromDirectory(obj);
+	}
+	/* Now add it */
+	list_add(&obj->siblings, &directory->variant.directoryVariant.children);
+	obj->parent = directory;
+
+	if (directory == obj->myDev->unlinkedDir
+	    || directory == obj->myDev->deletedDir) {
+		obj->unlinked = 1;
+		obj->myDev->nUnlinkedFiles++;
+		obj->renameAllowed = 0;
+	}
+}
+
+yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
+				     const YCHAR * name)
+{
+	int sum;
+
+	struct list_head *i;
+	YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
+
+	yaffs_Object *l;
+
+	if (!name) {
+		return NULL;
+	}
+
+	if (!directory) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: yaffs_FindObjectByName: null pointer directory"
+		    TENDSTR)));
+		YBUG();
+	}
+	if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
+		YBUG();
+	}
+
+	sum = yaffs_CalcNameSum(name);
+
+	list_for_each(i, &directory->variant.directoryVariant.children) {
+		if (i) {
+			l = list_entry(i, yaffs_Object, siblings);
+			
+			yaffs_CheckObjectDetailsLoaded(l);
+
+			/* Special case for lost-n-found */
+			if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
+				if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
+					return l;
+				}
+			} else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)	
+			{
+				/* LostnFound cunk called Objxxx
+				 * Do a real check
+				 */
+				yaffs_GetObjectName(l, buffer,
+						    YAFFS_MAX_NAME_LENGTH);
+				if (yaffs_strncmp(name, buffer,YAFFS_MAX_NAME_LENGTH) == 0) {
+					return l;
+				}
+
+			}
+		}
+	}
+
+	return NULL;
+}
+
+
+#if 0
+int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
+				   int (*fn) (yaffs_Object *))
+{
+	struct list_head *i;
+	yaffs_Object *l;
+
+	if (!theDir) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: yaffs_FindObjectByName: null pointer directory"
+		    TENDSTR)));
+		YBUG();
+	}
+	if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
+		YBUG();
+	}
+
+	list_for_each(i, &theDir->variant.directoryVariant.children) {
+		if (i) {
+			l = list_entry(i, yaffs_Object, siblings);
+			if (l && !fn(l)) {
+				return YAFFS_FAIL;
+			}
+		}
+	}
+
+	return YAFFS_OK;
+
+}
+#endif
+
+/* GetEquivalentObject dereferences any hard links to get to the
+ * actual object.
+ */
+
+yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
+{
+	if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
+		/* We want the object id of the equivalent object, not this one */
+		obj = obj->variant.hardLinkVariant.equivalentObject;
+		yaffs_CheckObjectDetailsLoaded(obj);
+	}
+	return obj;
+
+}
+
+int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
+{
+	memset(name, 0, buffSize * sizeof(YCHAR));
+	
+	yaffs_CheckObjectDetailsLoaded(obj);
+
+	if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
+		yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
+	} else if (obj->chunkId <= 0) {
+		YCHAR locName[20];
+		/* make up a name */
+		yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
+			      obj->objectId);
+		yaffs_strncpy(name, locName, buffSize - 1);
+
+	}
+#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
+	else if (obj->shortName[0]) {
+		yaffs_strcpy(name, obj->shortName);
+	}
+#endif
+	else {
+		int result;
+		__u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
+
+		yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
+
+		memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
+
+		if (obj->chunkId >= 0) {
+			result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
+							obj->chunkId, buffer,
+							NULL);
+		}
+		yaffs_strncpy(name, oh->name, buffSize - 1);
+
+		yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
+	}
+
+	return yaffs_strlen(name);
+}
+
+int yaffs_GetObjectFileLength(yaffs_Object * obj)
+{
+
+	/* Dereference any hard linking */
+	obj = yaffs_GetEquivalentObject(obj);
+
+	if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
+		return obj->variant.fileVariant.fileSize;
+	}
+	if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
+		return yaffs_strlen(obj->variant.symLinkVariant.alias);
+	} else {
+		/* Only a directory should drop through to here */
+		return obj->myDev->nDataBytesPerChunk;
+	}
+}
+
+int yaffs_GetObjectLinkCount(yaffs_Object * obj)
+{
+	int count = 0;
+	struct list_head *i;
+
+	if (!obj->unlinked) {
+		count++;	/* the object itself */
+	}
+	list_for_each(i, &obj->hardLinks) {
+		count++;	/* add the hard links; */
+	}
+	return count;
+
+}
+
+int yaffs_GetObjectInode(yaffs_Object * obj)
+{
+	obj = yaffs_GetEquivalentObject(obj);
+
+	return obj->objectId;
+}
+
+unsigned yaffs_GetObjectType(yaffs_Object * obj)
+{
+	obj = yaffs_GetEquivalentObject(obj);
+
+	switch (obj->variantType) {
+	case YAFFS_OBJECT_TYPE_FILE:
+		return DT_REG;
+		break;
+	case YAFFS_OBJECT_TYPE_DIRECTORY:
+		return DT_DIR;
+		break;
+	case YAFFS_OBJECT_TYPE_SYMLINK:
+		return DT_LNK;
+		break;
+	case YAFFS_OBJECT_TYPE_HARDLINK:
+		return DT_REG;
+		break;
+	case YAFFS_OBJECT_TYPE_SPECIAL:
+		if (S_ISFIFO(obj->yst_mode))
+			return DT_FIFO;
+		if (S_ISCHR(obj->yst_mode))
+			return DT_CHR;
+		if (S_ISBLK(obj->yst_mode))
+			return DT_BLK;
+		if (S_ISSOCK(obj->yst_mode))
+			return DT_SOCK;
+	default:
+		return DT_REG;
+		break;
+	}
+}
+
+YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
+{
+	obj = yaffs_GetEquivalentObject(obj);
+	if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
+		return yaffs_CloneString(obj->variant.symLinkVariant.alias);
+	} else {
+		return yaffs_CloneString(_Y(""));
+	}
+}
+
+#ifndef CONFIG_YAFFS_WINCE
+
+int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
+{
+	unsigned int valid = attr->ia_valid;
+
+	if (valid & ATTR_MODE)
+		obj->yst_mode = attr->ia_mode;
+	if (valid & ATTR_UID)
+		obj->yst_uid = attr->ia_uid;
+	if (valid & ATTR_GID)
+		obj->yst_gid = attr->ia_gid;
+
+	if (valid & ATTR_ATIME)
+		obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
+	if (valid & ATTR_CTIME)
+		obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
+	if (valid & ATTR_MTIME)
+		obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
+
+	if (valid & ATTR_SIZE)
+		yaffs_ResizeFile(obj, attr->ia_size);
+
+	yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
+
+	return YAFFS_OK;
+
+}
+int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
+{
+	unsigned int valid = 0;
+
+	attr->ia_mode = obj->yst_mode;
+	valid |= ATTR_MODE;
+	attr->ia_uid = obj->yst_uid;
+	valid |= ATTR_UID;
+	attr->ia_gid = obj->yst_gid;
+	valid |= ATTR_GID;
+
+	Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
+	valid |= ATTR_ATIME;
+	Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
+	valid |= ATTR_CTIME;
+	Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
+	valid |= ATTR_MTIME;
+
+	attr->ia_size = yaffs_GetFileSize(obj);
+	valid |= ATTR_SIZE;
+
+	attr->ia_valid = valid;
+
+	return YAFFS_OK;
+
+}
+
+#endif
+
+#if 0
+int yaffs_DumpObject(yaffs_Object * obj)
+{
+	YCHAR name[257];
+
+	yaffs_GetObjectName(obj, name, 256);
+
+	T(YAFFS_TRACE_ALWAYS,
+	  (TSTR
+	   ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
+	    " chunk %d type %d size %d\n"
+	    TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
+	   obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
+	   yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
+
+	return YAFFS_OK;
+}
+#endif
+
+/*---------------------------- Initialisation code -------------------------------------- */
+
+static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
+{
+
+	/* Common functions, gotta have */
+	if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
+		return 0;
+
+#ifdef CONFIG_YAFFS_YAFFS2
+
+	/* Can use the "with tags" style interface for yaffs1 or yaffs2 */
+	if (dev->writeChunkWithTagsToNAND &&
+	    dev->readChunkWithTagsFromNAND &&
+	    !dev->writeChunkToNAND &&
+	    !dev->readChunkFromNAND &&
+	    dev->markNANDBlockBad && dev->queryNANDBlock)
+		return 1;
+#endif
+
+	/* Can use the "spare" style interface for yaffs1 */
+	if (!dev->isYaffs2 &&
+	    !dev->writeChunkWithTagsToNAND &&
+	    !dev->readChunkWithTagsFromNAND &&
+	    dev->writeChunkToNAND &&
+	    dev->readChunkFromNAND &&
+	    !dev->markNANDBlockBad && !dev->queryNANDBlock)
+		return 1;
+
+	return 0;		/* bad */
+}
+
+
+static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
+{
+	/* Initialise the unlinked, deleted, root and lost and found directories */
+	
+	dev->lostNFoundDir = dev->rootDir =  NULL;
+	dev->unlinkedDir = dev->deletedDir = NULL;
+
+	dev->unlinkedDir =
+	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
+	
+	dev->deletedDir =
+	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
+
+	dev->rootDir =
+	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
+				      YAFFS_ROOT_MODE | S_IFDIR);
+	dev->lostNFoundDir =
+	    yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
+				      YAFFS_LOSTNFOUND_MODE | S_IFDIR);
+	
+	if(dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir){
+		yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
+		return YAFFS_OK;
+	}
+	
+	return YAFFS_FAIL;
+}
+
+int yaffs_GutsInitialise(yaffs_Device * dev)
+{
+	int init_failed = 0;
+	unsigned x;
+	int bits;
+
+	T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
+
+	/* Check stuff that must be set */
+
+	if (!dev) {
+		T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	dev->internalStartBlock = dev->startBlock;
+	dev->internalEndBlock = dev->endBlock;
+	dev->blockOffset = 0;
+	dev->chunkOffset = 0;
+	dev->nFreeChunks = 0;
+
+	if (dev->startBlock == 0) {
+		dev->internalStartBlock = dev->startBlock + 1;
+		dev->internalEndBlock = dev->endBlock + 1;
+		dev->blockOffset = 1;
+		dev->chunkOffset = dev->nChunksPerBlock;
+	}
+
+	/* Check geometry parameters. */
+
+	if ((dev->isYaffs2 && dev->nDataBytesPerChunk < 1024) || 
+	    (!dev->isYaffs2 && dev->nDataBytesPerChunk != 512) || 
+	     dev->nChunksPerBlock < 2 || 
+	     dev->nReservedBlocks < 2 || 
+	     dev->internalStartBlock <= 0 || 
+	     dev->internalEndBlock <= 0 || 
+	     dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2)	// otherwise it is too small
+	    ) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
+		    TENDSTR), dev->nDataBytesPerChunk, dev->isYaffs2 ? "2" : ""));
+		return YAFFS_FAIL;
+	}
+
+	if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	/* Got the right mix of functions? */
+	if (!yaffs_CheckDevFunctions(dev)) {
+		/* Function missing */
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR
+		   ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
+
+		return YAFFS_FAIL;
+	}
+
+	/* This is really a compilation check. */
+	if (!yaffs_CheckStructures()) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	if (dev->isMounted) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("yaffs: device already mounted\n" TENDSTR)));
+		return YAFFS_FAIL;
+	}
+
+	/* Finished with most checks. One or two more checks happen later on too. */
+
+	dev->isMounted = 1;
+
+
+
+	/* OK now calculate a few things for the device */
+	
+	/*
+	 *  Calculate all the chunk size manipulation numbers: 
+	 */
+	 /* Start off assuming it is a power of 2 */
+	 dev->chunkShift = ShiftDiv(dev->nDataBytesPerChunk);
+	 dev->chunkMask = (1<<dev->chunkShift) - 1;
+
+	 if(dev->nDataBytesPerChunk == (dev->chunkMask + 1)){
+	 	/* Yes it is a power of 2, disable crumbs */
+		dev->crumbMask = 0;
+		dev->crumbShift = 0;
+		dev->crumbsPerChunk = 0;
+	 } else {
+	 	/* Not a power of 2, use crumbs instead */
+		dev->crumbShift = ShiftDiv(sizeof(yaffs_PackedTags2TagsPart));
+		dev->crumbMask = (1<<dev->crumbShift)-1;
+		dev->crumbsPerChunk = dev->nDataBytesPerChunk/(1 << dev->crumbShift);
+		dev->chunkShift = 0;
+		dev->chunkMask = 0;
+	}
+	 	
+
+	/*
+	 * Calculate chunkGroupBits.
+	 * We need to find the next power of 2 > than internalEndBlock
+	 */
+
+	x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
+	
+	bits = ShiftsGE(x);
+	
+	/* Set up tnode width if wide tnodes are enabled. */
+	if(!dev->wideTnodesDisabled){
+		/* bits must be even so that we end up with 32-bit words */
+		if(bits & 1)
+			bits++;
+		if(bits < 16)
+			dev->tnodeWidth = 16;
+		else
+			dev->tnodeWidth = bits;
+	}
+	else
+		dev->tnodeWidth = 16;
+ 
+	dev->tnodeMask = (1<<dev->tnodeWidth)-1;
+		
+	/* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
+	 * so if the bitwidth of the
+	 * chunk range we're using is greater than 16 we need
+	 * to figure out chunk shift and chunkGroupSize
+	 */
+		 
+	if (bits <= dev->tnodeWidth)
+		dev->chunkGroupBits = 0;
+	else
+		dev->chunkGroupBits = bits - dev->tnodeWidth;
+		
+
+	dev->chunkGroupSize = 1 << dev->chunkGroupBits;
+
+	if (dev->nChunksPerBlock < dev->chunkGroupSize) {
+		/* We have a problem because the soft delete won't work if
+		 * the chunk group size > chunks per block.
+		 * This can be remedied by using larger "virtual blocks".
+		 */
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("yaffs: chunk group too large\n" TENDSTR)));
+
+		return YAFFS_FAIL;
+	}
+
+	/* OK, we've finished verifying the device, lets continue with initialisation */
+
+	/* More device initialisation */
+	dev->garbageCollections = 0;
+	dev->passiveGarbageCollections = 0;
+	dev->currentDirtyChecker = 0;
+	dev->bufferedBlock = -1;
+	dev->doingBufferedBlockRewrite = 0;
+	dev->nDeletedFiles = 0;
+	dev->nBackgroundDeletions = 0;
+	dev->nUnlinkedFiles = 0;
+	dev->eccFixed = 0;
+	dev->eccUnfixed = 0;
+	dev->tagsEccFixed = 0;
+	dev->tagsEccUnfixed = 0;
+	dev->nErasureFailures = 0;
+	dev->nErasedBlocks = 0;
+	dev->isDoingGC = 0;
+	dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
+
+	/* Initialise temporary buffers and caches. */
+	if(!yaffs_InitialiseTempBuffers(dev))
+		init_failed = 1;
+	
+	dev->srCache = NULL;
+	dev->gcCleanupList = NULL;
+	
+	
+	if (!init_failed &&
+	    dev->nShortOpCaches > 0) {
+		int i;
+		__u8 *buf;
+		int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
+
+		if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
+			dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
+		}
+
+		buf = dev->srCache =  YMALLOC(srCacheBytes);
+		    
+		if(dev->srCache)
+			memset(dev->srCache,0,srCacheBytes);
+		   
+		for (i = 0; i < dev->nShortOpCaches && buf; i++) {
+			dev->srCache[i].object = NULL;
+			dev->srCache[i].lastUse = 0;
+			dev->srCache[i].dirty = 0;
+			dev->srCache[i].data = buf = YMALLOC_DMA(dev->nDataBytesPerChunk);
+		}
+		if(!buf)
+			init_failed = 1;
+			
+		dev->srLastUse = 0;
+	}
+
+	dev->cacheHits = 0;
+	
+	if(!init_failed){
+		dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
+		if(!dev->gcCleanupList)
+			init_failed = 1;
+	}
+
+	if (dev->isYaffs2) {
+		dev->useHeaderFileSize = 1;
+	}
+	if(!init_failed && !yaffs_InitialiseBlocks(dev))
+		init_failed = 1;
+		
+	yaffs_InitialiseTnodes(dev);
+	yaffs_InitialiseObjects(dev);
+
+	if(!init_failed && !yaffs_CreateInitialDirectories(dev))
+		init_failed = 1;
+
+
+	if(!init_failed){
+		/* Now scan the flash. */
+		if (dev->isYaffs2) {
+			if(yaffs_CheckpointRestore(dev)) {
+				T(YAFFS_TRACE_ALWAYS,
+				  (TSTR("yaffs: restored from checkpoint" TENDSTR)));
+			} else {
+
+				/* Clean up the mess caused by an aborted checkpoint load 
+				 * and scan backwards. 
+				 */
+				yaffs_DeinitialiseBlocks(dev);
+				yaffs_DeinitialiseTnodes(dev);
+				yaffs_DeinitialiseObjects(dev);
+				
+			
+				dev->nErasedBlocks = 0;
+				dev->nFreeChunks = 0;
+				dev->allocationBlock = -1;
+				dev->allocationPage = -1;
+				dev->nDeletedFiles = 0;
+				dev->nUnlinkedFiles = 0;
+				dev->nBackgroundDeletions = 0;
+				dev->oldestDirtySequence = 0;
+
+				if(!init_failed && !yaffs_InitialiseBlocks(dev))
+					init_failed = 1;
+					
+				yaffs_InitialiseTnodes(dev);
+				yaffs_InitialiseObjects(dev);
+
+				if(!init_failed && !yaffs_CreateInitialDirectories(dev))
+					init_failed = 1;
+
+				if(!init_failed && !yaffs_ScanBackwards(dev))
+					init_failed = 1;
+			}
+		}else
+			if(!yaffs_Scan(dev))
+				init_failed = 1;
+	}
+		
+	if(init_failed){
+		/* Clean up the mess */
+		T(YAFFS_TRACE_TRACING,
+		  (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
+
+		yaffs_Deinitialise(dev);
+		return YAFFS_FAIL;
+	}
+
+	/* Zero out stats */
+	dev->nPageReads = 0;
+	dev->nPageWrites = 0;
+	dev->nBlockErasures = 0;
+	dev->nGCCopies = 0;
+	dev->nRetriedWrites = 0;
+
+	dev->nRetiredBlocks = 0;
+
+	yaffs_VerifyFreeChunks(dev);
+	yaffs_VerifyBlocks(dev);
+	
+
+	T(YAFFS_TRACE_TRACING,
+	  (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
+	return YAFFS_OK;
+
+}
+
+void yaffs_Deinitialise(yaffs_Device * dev)
+{
+	if (dev->isMounted) {
+		int i;
+
+		yaffs_DeinitialiseBlocks(dev);
+		yaffs_DeinitialiseTnodes(dev);
+		yaffs_DeinitialiseObjects(dev);
+		if (dev->nShortOpCaches > 0 &&
+		    dev->srCache) {
+
+			for (i = 0; i < dev->nShortOpCaches; i++) {
+				if(dev->srCache[i].data)
+					YFREE(dev->srCache[i].data);
+				dev->srCache[i].data = NULL;
+			}
+
+			YFREE(dev->srCache);
+			dev->srCache = NULL;
+		}
+
+		YFREE(dev->gcCleanupList);
+
+		for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
+			YFREE(dev->tempBuffer[i].buffer);
+		}
+
+		dev->isMounted = 0;
+	}
+
+}
+
+static int yaffs_CountFreeChunks(yaffs_Device * dev)
+{
+	int nFree;
+	int b;
+
+	yaffs_BlockInfo *blk;
+
+	for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
+	     b++) {
+		blk = yaffs_GetBlockInfo(dev, b);
+
+		switch (blk->blockState) {
+		case YAFFS_BLOCK_STATE_EMPTY:
+		case YAFFS_BLOCK_STATE_ALLOCATING:
+		case YAFFS_BLOCK_STATE_COLLECTING:
+		case YAFFS_BLOCK_STATE_FULL:
+			nFree +=
+			    (dev->nChunksPerBlock - blk->pagesInUse +
+			     blk->softDeletions);
+			break;
+		default:
+			break;
+		}
+
+	}
+
+	return nFree;
+}
+
+int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
+{
+	/* This is what we report to the outside world */
+
+	int nFree;
+	int nDirtyCacheChunks;
+	int blocksForCheckpoint;
+
+#if 1
+	nFree = dev->nFreeChunks;
+#else
+	nFree = yaffs_CountFreeChunks(dev);
+#endif
+
+	nFree += dev->nDeletedFiles;
+	
+	/* Now count the number of dirty chunks in the cache and subtract those */
+
+	{
+		int i;
+		for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
+			if (dev->srCache[i].dirty)
+				nDirtyCacheChunks++;
+		}
+	}
+
+	nFree -= nDirtyCacheChunks;
+
+	nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
+	
+	/* Now we figure out how much to reserve for the checkpoint and report that... */
+	blocksForCheckpoint = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
+	if(blocksForCheckpoint < 0)
+		blocksForCheckpoint = 0;
+		
+	nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
+
+	if (nFree < 0)
+		nFree = 0;
+
+	return nFree;
+
+}
+
+static int yaffs_freeVerificationFailures;
+
+static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
+{
+	int counted;
+	int difference;
+	
+	if(yaffs_SkipVerification(dev))
+		return;
+	
+	counted = yaffs_CountFreeChunks(dev);
+
+	difference = dev->nFreeChunks - counted;
+
+	if (difference) {
+		T(YAFFS_TRACE_ALWAYS,
+		  (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
+		   dev->nFreeChunks, counted, difference));
+		yaffs_freeVerificationFailures++;
+	}
+}
+
+/*---------------------------------------- YAFFS test code ----------------------*/
+
+#define yaffs_CheckStruct(structure,syze, name) \
+           if(sizeof(structure) != syze) \
+	       { \
+	         T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
+		 name,syze,sizeof(structure))); \
+	         return YAFFS_FAIL; \
+		}
+
+static int yaffs_CheckStructures(void)
+{
+/*      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
+/*      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
+/*      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
+#ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
+	yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
+#endif
+	    yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")
+
+	    return YAFFS_OK;
+}