--- /dev/null
+/*
+ * YAFFS: Yet another FFS. A NAND-flash specific file system.
+ * yaffs_guts.c The main guts of YAFFS
+ *
+ * Copyright (C) 2002 Aleph One Ltd.
+ * for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+ //yaffs_guts.c
+
+const char *yaffs_guts_c_version="$Id: yaffs_guts.c,v 1.1 2004-11-03 08:14:07 charles Exp $";
+
+#include "yportenv.h"
+
+#include "yaffsinterface.h"
+#include "yaffs_guts.h"
+
+#include "yaffs_tagscompat.h"
+
+#ifdef CONFIG_YAFFS_WINCE
+void yfsd_LockYAFFS(BOOL fsLockOnly);
+void yfsd_UnlockYAFFS(BOOL fsLockOnly);
+#endif
+
+#define YAFFS_PASSIVE_GC_CHUNKS 2
+
+#if 0
+// Use Steven Hill's ECC struff instead
+// External functions for ECC on data
+void nand_calculate_ecc (const u_char *dat, u_char *ecc_code);
+int nand_correct_data (u_char *dat, u_char *read_ecc, u_char *calc_ecc);
+#define yaffs_ECCCalculate(data,ecc) nand_calculate_ecc(data,ecc)
+#define yaffs_ECCCorrect(data,read_ecc,calc_ecc) nand_correct_ecc(data,read_ecc,calc_ecc)
+#else
+#include "yaffs_ecc.h"
+#endif
+
+// countBits is a quick way of counting the number of bits in a byte.
+// ie. countBits[n] holds the number of 1 bits in a byte with the value n.
+
+static const char yaffs_countBitsTable[256] =
+{
+0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
+4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8
+};
+
+static int yaffs_CountBits(__u8 x)
+{
+ int retVal;
+ retVal = yaffs_countBitsTable[x];
+ return retVal;
+}
+
+
+#if 0
+// Stuff using yea olde tags
+static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr);
+static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr);
+
+static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted);
+static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted);
+#else
+#endif
+
+// NAND access
+
+
+static Y_INLINE int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *buffer, yaffs_ExtendedTags *tags);
+static Y_INLINE int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *data, yaffs_ExtendedTags *tags);
+static Y_INLINE int yaffs_MarkBlockBad(yaffs_Device *dev, int blockNo);
+static Y_INLINE int yaffs_QueryInitialBlockState(yaffs_Device *dev,int blockNo, yaffs_BlockState *state,unsigned *sequenceNumber);
+// Local prototypes
+static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_ExtendedTags *tags, int useReserve);
+static int yaffs_CheckObjectHashSanity(yaffs_Device *dev);
+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);
+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_ValidateTags(yaffs_ExtendedTags *tags);
+
+// Robustification (if it ever comes about...)
+static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND);
+static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND);
+static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND);
+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);
+
+static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND);
+
+static int yaffs_UnlinkWorker(yaffs_Object *obj);
+static void yaffs_DestroyObject(yaffs_Object *obj);
+
+#if 0
+static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1,int dataSize);
+#endif
+
+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);
+
+#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 int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device *dev,int chunkInNAND, __u8 *buffer, yaffs_ExtendedTags *tags)
+{
+ if(dev->readChunkWithTagsFromNAND)
+ return dev->readChunkWithTagsFromNAND(dev,chunkInNAND,buffer,tags);
+ else
+ return yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,tags);
+}
+
+static Y_INLINE int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *buffer, yaffs_ExtendedTags *tags)
+{
+ if(tags)
+ {
+ tags->sequenceNumber = dev->sequenceNumber;
+ tags->chunkUsed = 1;
+ if(!yaffs_ValidateTags(tags))
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("Writing uninitialised tags" TENDSTR)));
+ YBUG();
+ }
+ T(YAFFS_TRACE_WRITE,(TSTR("Writing chunk %d tags %d %d"TENDSTR),chunkInNAND,tags->objectId,tags->chunkId));
+ }
+ else
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("Writing with no tags" TENDSTR)));
+ YBUG();
+ }
+
+ if(dev->writeChunkWithTagsToNAND)
+ return dev->writeChunkWithTagsToNAND(dev,chunkInNAND,buffer,tags);
+ else
+ return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,chunkInNAND,buffer,tags);
+}
+
+static Y_INLINE int yaffs_MarkBlockBad(yaffs_Device *dev, int blockNo)
+{
+ if(dev->markNANDBlockBad)
+ return dev->markNANDBlockBad(dev,blockNo);
+ else
+ return yaffs_TagsCompatabilityMarkNANDBlockBad(dev,blockNo);
+}
+static Y_INLINE int yaffs_QueryInitialBlockState(yaffs_Device *dev,int blockNo, yaffs_BlockState *state, unsigned *sequenceNumber)
+{
+ if(dev->queryNANDBlock)
+ return dev->queryNANDBlock(dev,blockNo,state,sequenceNumber);
+ else
+ return yaffs_TagsCompatabilityQueryNANDBlock(dev,blockNo,state,sequenceNumber);
+}
+
+int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND)
+{
+ int result;
+
+ dev->nBlockErasures++;
+ result = dev->eraseBlockInNAND(dev,blockInNAND);
+
+ if(!result)result = dev->eraseBlockInNAND(dev,blockInNAND); // If at first we don't succeed, try again *once*.
+ return result;
+}
+
+int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
+{
+ return dev->initialiseNAND(dev);
+}
+
+
+
+
+// Temporary buffer manipulations
+
+static __u8 *yaffs_GetTempBuffer(yaffs_Device *dev,int lineNo)
+{
+ int i,j;
+ for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+ {
+ if(dev->tempBuffer[i].line == 0)
+ {
+ dev->tempBuffer[i].line = lineNo;
+ if((i+1) > dev->maxTemp)
+ {
+ dev->maxTemp = i + 1;
+ for(j = 0; j <= i; j++)
+ dev->tempBuffer[j].maxLine = dev->tempBuffer[j].line;
+ }
+
+ return dev->tempBuffer[i].buffer;
+ }
+ }
+
+ T(YAFFS_TRACE_BUFFERS,(TSTR("Out of temp buffers at line %d, other held by lines:"),lineNo));
+ for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+ {
+ T(YAFFS_TRACE_BUFFERS,(TSTR(" %d "),dev->tempBuffer[i].line));
+ }
+ T(YAFFS_TRACE_BUFFERS,(TSTR(" "TENDSTR)));
+
+ dev->unmanagedTempAllocations++;
+ // Get an unmanaged one
+ return YMALLOC(dev->nBytesPerChunk);
+
+
+}
+
+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++;
+ }
+
+}
+
+
+// Chunk bitmap manipulations
+
+static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
+{
+ if(blk < dev->startBlock || blk > dev->endBlock)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),blk));
+ YBUG();
+ }
+ return dev->chunkBits + (dev->chunkBitmapStride * (blk - dev->startBlock));
+}
+
+static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev,int blk)
+{
+ __u8 *blkBits = yaffs_BlockBits(dev,blk);
+
+ memset(blkBits,0,dev->chunkBitmapStride);
+}
+
+static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev,int blk,int chunk)
+{
+ __u8 *blkBits = yaffs_BlockBits(dev,blk);
+
+ blkBits[chunk/8] &= ~ (1<<(chunk & 7));
+}
+
+static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev,int blk,int chunk)
+{
+ __u8 *blkBits = yaffs_BlockBits(dev,blk);
+
+ blkBits[chunk/8] |= (1<<(chunk & 7));
+}
+
+static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev,int blk,int chunk)
+{
+ __u8 *blkBits = yaffs_BlockBits(dev,blk);
+ return (blkBits[chunk/8] & (1<<(chunk & 7))) ? 1 :0;
+}
+
+static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev,int blk)
+{
+ __u8 *blkBits = yaffs_BlockBits(dev,blk);
+ int i;
+ for(i = 0; i < dev->chunkBitmapStride; i++)
+ {
+ if(*blkBits) return 1;
+ blkBits++;
+ }
+ return 0;
+}
+
+#if 0
+// Function to manipulate block info
+static Y_INLINE yaffs_BlockInfo* yaffs_GetBlockInfo(yaffs_Device *dev, int blk)
+{
+ if(blk < dev->startBlock || blk > dev->endBlock)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: getBlockInfo block %d is not valid" TENDSTR),blk));
+ YBUG();
+ }
+ return &dev->blockInfo[blk - dev->startBlock];
+}
+#endif
+
+
+static Y_INLINE int yaffs_HashFunction(int n)
+{
+ return (n % YAFFS_NOBJECT_BUCKETS);
+}
+
+
+yaffs_Object *yaffs_Root(yaffs_Device *dev)
+{
+ return dev->rootDir;
+}
+
+yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
+{
+ return dev->lostNFoundDir;
+}
+
+#if 0
+static int yaffs_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare)
+{
+ if(chunkInNAND < dev->startBlock * dev->nChunksPerBlock)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d is not valid" TENDSTR),chunkInNAND));
+ return YAFFS_FAIL;
+ }
+
+ dev->nPageWrites++;
+ return dev->writeChunkToNAND(dev,chunkInNAND,data,spare);
+}
+
+
+
+static int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,
+ int chunkInNAND,
+ __u8 *data,
+ yaffs_Spare *spare,
+ int doErrorCorrection)
+{
+ int retVal;
+ yaffs_Spare localSpare;
+
+ dev->nPageReads++;
+
+
+
+
+ if(!spare && data)
+ {
+ // If we don't have a real spare, then we use a local one.
+ // Need this for the calculation of the ecc
+ spare = &localSpare;
+ }
+
+
+ if(!dev->useNANDECC)
+ {
+ retVal = dev->readChunkFromNAND(dev,chunkInNAND,data,spare);
+ if(data && doErrorCorrection)
+ {
+ // Do ECC correction
+ //Todo handle any errors
+ int eccResult1,eccResult2;
+ __u8 calcEcc[3];
+
+ yaffs_ECCCalculate(data,calcEcc);
+ eccResult1 = yaffs_ECCCorrect (data,spare->ecc1, calcEcc);
+ yaffs_ECCCalculate(&data[256],calcEcc);
+ eccResult2 = yaffs_ECCCorrect(&data[256],spare->ecc2, calcEcc);
+
+ if(eccResult1>0)
+ {
+ T(YAFFS_TRACE_ERROR, (TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND));
+ dev->eccFixed++;
+ }
+ else if(eccResult1<0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND));
+ dev->eccUnfixed++;
+ }
+
+ if(eccResult2>0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND));
+ dev->eccFixed++;
+ }
+ else if(eccResult2<0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND));
+ dev->eccUnfixed++;
+ }
+
+ if(eccResult1 || eccResult2)
+ {
+ // Hoosterman, we had a data problem on this page
+ yaffs_HandleReadDataError(dev,chunkInNAND);
+ }
+ }
+ }
+ else
+ {
+ // Must allocate enough memory for spare+2*sizeof(int) for ecc results from device.
+ struct yaffs_NANDSpare nspare;
+ retVal = dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare*)&nspare);
+ memcpy (spare, &nspare, sizeof(yaffs_Spare));
+ if(data && doErrorCorrection)
+ {
+ if(nspare.eccres1>0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND));
+ }
+ else if(nspare.eccres1<0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND));
+ }
+
+ if(nspare.eccres2>0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND));
+ }
+ else if(nspare.eccres2<0)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND));
+ }
+
+ if(nspare.eccres1 || nspare.eccres2)
+ {
+ // Hoosterman, we had a data problem on this page
+ yaffs_HandleReadDataError(dev,chunkInNAND);
+ }
+
+ }
+ }
+ return retVal;
+}
+
+#endif
+
+
+
+int yaffs_CheckFF(__u8 *buffer,int nBytes)
+{
+ //Horrible, slow implementation
+ while(nBytes--)
+ {
+ if(*buffer != 0xFF) return 0;
+ }
+ 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;
+
+ dev->readChunkWithTagsFromNAND(dev,chunkInNAND,data,&tags);
+
+ if(!yaffs_CheckFF(data,dev->nBytesPerChunk) || tags.chunkUsed)
+ {
+ T(YAFFS_TRACE_NANDACCESS,(TSTR("Chunk %d not erased" TENDSTR),chunkInNAND));
+ retval = YAFFS_FAIL;
+ }
+
+ yaffs_ReleaseTempBuffer(dev,data,__LINE__);
+
+ return retval;
+
+}
+
+
+
+#if 1
+static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev, const __u8 *data, yaffs_ExtendedTags *tags,int useReserve)
+{
+ int chunk;
+
+ int writeOk = 1;
+ int attempts = 0;
+
+
+
+ do{
+ chunk = yaffs_AllocateChunk(dev,useReserve);
+
+ if(chunk >= 0)
+ {
+
+ // First check this chunk is erased...
+#ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
+ writeOk = yaffs_CheckChunkErased(dev,chunk);
+#endif
+ if(!writeOk)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d was not erased" TENDSTR),chunk));
+ }
+ else
+ {
+ writeOk = yaffs_WriteChunkWithTagsToNAND(dev,chunk,data,tags);
+ }
+ attempts++;
+
+ if(writeOk)
+ {
+ // Copy the data into the robustification buffer.
+ // NB We do this at the end to prevent duplicates in the case of a write error.
+ //Todo
+ yaffs_HandleWriteChunkOk(dev,chunk,data,tags);
+ }
+ else
+ {
+ yaffs_HandleWriteChunkError(dev,chunk);
+ }
+ }
+
+ } while(chunk >= 0 && ! writeOk);
+
+ if(attempts > 1)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write required %d attempts" TENDSTR),attempts));
+ dev->nRetriedWrites+= (attempts - 1);
+ }
+
+
+
+ return chunk;
+}
+#endif
+
+
+///
+// Functions for robustisizing
+//
+//
+
+static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND)
+{
+
+ yaffs_MarkBlockBad(dev,blockInNAND);
+
+ yaffs_GetBlockInfo(dev,blockInNAND)->blockState = YAFFS_BLOCK_STATE_DEAD;
+
+ dev->nRetiredBlocks++;
+}
+
+
+
+static int yaffs_RewriteBufferedBlock(yaffs_Device *dev)
+{
+ dev->doingBufferedBlockRewrite = 1;
+ //
+ // Remove erased chunks
+ // Rewrite existing chunks to a new block
+ // Set current write block to the new block
+
+ dev->doingBufferedBlockRewrite = 0;
+
+ return 1;
+}
+
+
+static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND)
+{
+ int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
+
+ // Mark the block for retirement
+ yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>>Block %d marked for retirement" TENDSTR),blockInNAND));
+
+
+ //TODO
+ // Just do a garbage collection on the affected block then retire the block
+ // NB recursion
+}
+
+
+static void yaffs_CheckWrittenBlock(yaffs_Device *dev,int chunkInNAND)
+{
+}
+
+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)
+{
+}
+
+static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND)
+{
+ int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
+
+ // Mark the block for retirement
+ yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
+ // Delete the chunk
+ yaffs_DeleteChunk(dev,chunkInNAND,1,__LINE__);
+}
+
+
+
+#if 0
+static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1,int dataSize)
+{
+
+
+ if( memcmp(d0,d1,dataSize) != 0 ||
+ s0->tagByte0 != s1->tagByte0 ||
+ s0->tagByte1 != s1->tagByte1 ||
+ s0->tagByte2 != s1->tagByte2 ||
+ s0->tagByte3 != s1->tagByte3 ||
+ s0->tagByte4 != s1->tagByte4 ||
+ s0->tagByte5 != s1->tagByte5 ||
+ s0->tagByte6 != s1->tagByte6 ||
+ s0->tagByte7 != s1->tagByte7 ||
+ s0->ecc1[0] != s1->ecc1[0] ||
+ s0->ecc1[1] != s1->ecc1[1] ||
+ s0->ecc1[2] != s1->ecc1[2] ||
+ s0->ecc2[0] != s1->ecc2[0] ||
+ s0->ecc2[1] != s1->ecc2[1] ||
+ s0->ecc2[2] != s1->ecc2[2] )
+ {
+ return 0;
+ }
+
+ return 1;
+}
+#endif
+
+
+///////////////////////// Object management //////////////////
+// List of spare objects
+// The list is hooked together using the first pointer
+// in the object
+
+// static yaffs_Object *yaffs_freeObjects = NULL;
+
+// static int yaffs_nFreeObjects;
+
+// static yaffs_ObjectList *yaffs_allocatedObjectList = NULL;
+
+// static yaffs_ObjectBucket yaffs_objectBucket[YAFFS_NOBJECT_BUCKETS];
+
+
+static __u16 yaffs_CalcNameSum(const YCHAR *name)
+{
+ __u16 sum = 0;
+ __u16 i = 1;
+
+ YUCHAR *bname = (YUCHAR *)name;
+ if(bname)
+ {
+ while ((*bname) && (i <=YAFFS_MAX_NAME_LENGTH))
+ {
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+ sum += yaffs_toupper(*bname) * i;
+#else
+ sum += (*bname) * i;
+#endif
+ i++;
+ bname++;
+ }
+ }
+ return sum;
+}
+
+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);
+}
+
+#if 0
+void yaffs_CalcECC(const __u8 *data, yaffs_Spare *spare)
+{
+ yaffs_ECCCalculate(data , spare->ecc1);
+ yaffs_ECCCalculate(&data[256] , spare->ecc2);
+}
+#endif
+
+
+///////////////////////// TNODES ///////////////////////
+
+// List of spare tnodes
+// The list is hooked together using the first pointer
+// in the tnode.
+
+//static yaffs_Tnode *yaffs_freeTnodes = NULL;
+
+// static int yaffs_nFreeTnodes;
+
+//static yaffs_TnodeList *yaffs_allocatedTnodeList = NULL;
+
+
+
+// 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;
+ yaffs_Tnode *newTnodes;
+ yaffs_TnodeList *tnl;
+
+ if(nTnodes < 1) return YAFFS_OK;
+
+ // make these things
+
+ newTnodes = YMALLOC(nTnodes * sizeof(yaffs_Tnode));
+
+ if (!newTnodes)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not allocate Tnodes"TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ // Hook them into the free list
+ 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] = 1;
+#endif
+ }
+
+ newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
+#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
+ newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = 1;
+#endif
+ dev->freeTnodes = newTnodes;
+ dev->nFreeTnodes+= nTnodes;
+ dev->nTnodesCreated += nTnodes;
+
+ // Now add this bunch of tnodes to a list for freeing up.
+ // NB If we can't add this to the management list it isn't fatal
+ // but it just means we can't free this bunch of tnodes later.
+ tnl = YMALLOC(sizeof(yaffs_TnodeList));
+ if(!tnl)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not add tnodes to management list" TENDSTR)));
+
+ }
+ else
+ {
+ tnl->tnodes = newTnodes;
+ tnl->next = dev->allocatedTnodeList;
+ dev->allocatedTnodeList = tnl;
+ }
+
+
+ T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Tnodes added" TENDSTR)));
+
+
+ return YAFFS_OK;
+}
+
+
+// GetTnode gets us a clean tnode. Tries to make allocate more if we run out
+static yaffs_Tnode *yaffs_GetTnode(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] != 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--;
+ // zero out
+ memset(tn,0,sizeof(yaffs_Tnode));
+ }
+
+
+ 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] = 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;
+
+}
+
+#if 0
+void yaffs_TnodeTest(yaffs_Device *dev)
+{
+
+ int i;
+ int j;
+ yaffs_Tnode *tn[1000];
+
+ YINFO("Testing TNodes");
+
+ for(j = 0; j < 50; j++)
+ {
+ for(i = 0; i < 1000; i++)
+ {
+ tn[i] = yaffs_GetTnode(dev);
+ if(!tn[i])
+ {
+ YALERT("Getting tnode failed");
+ }
+ }
+ for(i = 0; i < 1000; i+=3)
+ {
+ yaffs_FreeTnode(dev,tn[i]);
+ tn[i] = NULL;
+ }
+
+ }
+}
+#endif
+
+
+////////////////// END OF 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.
+// Used when reading.....
+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)
+ {
+// char str[50];
+// sprintf(str,"Bad level %d",level);
+// YALERT(str);
+ return NULL;
+ }
+
+ if(chunkId > YAFFS_MAX_CHUNK_ID)
+ {
+// char str[50];
+// sprintf(str,"Bad chunkId %d",chunkId);
+// YALERT(str);
+ return NULL;
+ }
+
+ // First check we're tall enough (ie enough topLevel)
+
+ i = chunkId >> (/*dev->chunkGroupBits + */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 >>(/* dev->chunkGroupBits + */ 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.
+//
+static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, yaffs_FileStructure *fStruct, __u32 chunkId)
+{
+
+ yaffs_Tnode *tn;
+
+ int requiredTallness;
+ int i;
+ int l;
+
+ __u32 x;
+
+
+ //T((TSTR("AddOrFind topLevel=%d, chunk=%d"),fStruct->topLevel,chunkId));
+
+ // Check sane level and page Id
+ if(fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
+ {
+// char str[50];
+// sprintf(str,"Bad level %d",fStruct->topLevel);
+// YALERT(str);
+ return NULL;
+ }
+
+ if(chunkId > YAFFS_MAX_CHUNK_ID)
+ {
+// char str[50];
+// sprintf(str,"Bad chunkId %d",chunkId);
+// YALERT(str);
+ return NULL;
+ }
+
+ // First check we're tall enough (ie enough topLevel)
+
+ x = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS);
+ requiredTallness = 0;
+ while(x)
+ {
+ x >>= YAFFS_TNODES_INTERNAL_BITS;
+ requiredTallness++;
+ }
+
+ //T((TSTR(" required=%d"),requiredTallness));
+
+
+ if(requiredTallness > fStruct->topLevel)
+ {
+ // Not tall enough,gotta make the tree taller
+ for(i = fStruct->topLevel; i < requiredTallness; i++)
+ {
+ //T((TSTR(" add new top")));
+
+ 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;
+ while (l > 0 && tn)
+ {
+ x = (chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS + (l-1) * YAFFS_TNODES_INTERNAL_BITS)) &
+ YAFFS_TNODES_INTERNAL_MASK;
+
+ //T((TSTR(" [%d:%d]"),l,i));
+
+ if(!tn->internal[x])
+ {
+ //T((TSTR(" added")));
+
+ tn->internal[x] = yaffs_GetTnode(dev);
+ }
+
+ tn = tn->internal[x];
+ l--;
+
+ }
+
+ //TSTR(TENDSTR)));
+
+ return tn;
+}
+
+
+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--)
+ {
+ if(tn->level0[i])
+ {
+
+ chunkInInode = (chunkOffset << YAFFS_TNODES_LEVEL0_BITS ) + i;
+
+ theChunk = tn->level0[i] << dev->chunkGroupBits;
+
+ 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;
+ }
+ }
+
+ }
+
+ tn->level0[i] = 0;
+ }
+
+ }
+ return (i < 0) ? 1 : 0;
+
+
+ }
+
+ }
+
+ return 1;
+
+}
+
+
+static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
+{
+
+ yaffs_BlockInfo *theBlock;
+
+ T(YAFFS_TRACE_DELETE,(TSTR("soft delete chunk %d" TENDSTR),chunk));
+
+ theBlock = yaffs_GetBlockInfo(dev, chunk/dev->nChunksPerBlock);
+ if(theBlock)
+ {
+ theBlock->softDeletions++;
+ }
+}
+
+// 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--)
+ {
+ if(tn->level0[i])
+ {
+ // Note this does not find the real chunk, only the chunk group.
+ // We make an assumption that a chunk group is niot larger than a block.
+ theChunk = (tn->level0[i] << dev->chunkGroupBits);
+
+ yaffs_SoftDeleteChunk(dev,theChunk);
+ tn->level0[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.
+
+// yaffs_PruneWorker should only be called by yaffs_PruneFileStructure()
+
+static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, __u32 level, int del0)
+{
+ int i;
+ int hasData;
+
+ if(tn)
+ {
+ hasData = 0;
+
+ for(i = 0; i < YAFFS_NTNODES_INTERNAL; i++)
+ {
+ if(tn->internal[i] && level > 0)
+ {
+ tn->internal[i] = yaffs_PruneWorker(dev,tn->internal[i],level - 1, ( i == 0) ? del0 : 1);
+ }
+
+ if(tn->internal[i])
+ {
+ hasData++;
+ }
+ }
+
+ if(hasData == 0 && del0)
+ {
+ // Free and return NULL
+
+ yaffs_FreeTnode(dev,tn);
+ tn = NULL;
+ }
+
+ }
+
+ return tn;
+
+}
+
+static int yaffs_PruneFileStructure(yaffs_Device *dev, yaffs_FileStructure *fStruct)
+{
+ int i;
+ int hasData;
+ int done = 0;
+ yaffs_Tnode *tn;
+
+ if(fStruct->topLevel > 0)
+ {
+ fStruct->top = yaffs_PruneWorker(dev,fStruct->top, fStruct->topLevel,0);
+
+ // Now we have a tree with all the non-zero branches NULL but the height
+ // is the same as it was.
+ // Let's see if we can trim internal tnodes to shorten the tree.
+ // We can do this if only the 0th element in the tnode is in use
+ // (ie all the non-zero are NULL)
+
+ while(fStruct->topLevel && !done)
+ {
+ tn = fStruct->top;
+
+ hasData = 0;
+ for(i = 1; i <YAFFS_NTNODES_INTERNAL; i++)
+ {
+ if(tn->internal[i])
+ {
+ hasData++;
+ }
+ }
+
+ if(!hasData)
+ {
+ fStruct->top = tn->internal[0];
+ fStruct->topLevel--;
+ yaffs_FreeTnode(dev,tn);
+ }
+ else
+ {
+ done = 1;
+ }
+ }
+ }
+
+ return YAFFS_OK;
+}
+
+
+
+
+
+/////////////////////// End of File Structure functions. /////////////////
+
+// yaffs_CreateFreeObjects creates a bunch more objects and
+// adds them to the object free list.
+static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
+{
+ int i;
+ yaffs_Object *newObjects;
+ yaffs_ObjectList *list;
+
+ if(nObjects < 1) return YAFFS_OK;
+
+ // make these things
+
+ newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
+
+ if (!newObjects)
+ {
+ T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Could not allocate more objects" TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ // Hook them into the free list
+ for(i = 0; i < nObjects - 1; i++)
+ {
+ newObjects[i].siblings.next = (struct list_head *)(&newObjects[i+1]);
+ }
+
+ newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
+ dev->freeObjects = newObjects;
+ dev->nFreeObjects+= nObjects;
+ dev->nObjectsCreated+= nObjects;
+
+ // Now add this bunch of Objects to a list for freeing up.
+
+ list = YMALLOC(sizeof(yaffs_ObjectList));
+ if(!list)
+ {
+ T(YAFFS_TRACE_ALLOCATE,(TSTR("Could not add objects to management list" TENDSTR)));
+ }
+ else
+ {
+ list->objects = newObjects;
+ list->next = dev->allocatedObjectList;
+ dev->allocatedObjectList = list;
+ }
+
+
+
+ return YAFFS_OK;
+}
+
+
+// AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out
+static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
+{
+ yaffs_Object *tn = NULL;
+
+ // If there are none left make more
+ if(!dev->freeObjects)
+ {
+ yaffs_CreateFreeObjects(dev,YAFFS_ALLOCATION_NOBJECTS);
+ }
+
+ if(dev->freeObjects)
+ {
+ tn = dev->freeObjects;
+ dev->freeObjects = (yaffs_Object *)(dev->freeObjects->siblings.next);
+ dev->nFreeObjects--;
+
+ // Now sweeten it up...
+
+ memset(tn,0,sizeof(yaffs_Object));
+ tn->myDev = dev;
+ tn->chunkId = -1;
+ tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
+ INIT_LIST_HEAD(&(tn->hardLinks));
+ INIT_LIST_HEAD(&(tn->hashLink));
+ INIT_LIST_HEAD(&tn->siblings);
+
+ // Add it to the lost and found directory.
+ // NB Can't put root or lostNFound in lostNFound so
+ // check if lostNFound exists first
+ if(dev->lostNFoundDir)
+ {
+ yaffs_AddObjectToDirectory(dev->lostNFoundDir,tn);
+ }
+ }
+
+
+ return tn;
+}
+
+static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev,int number,__u32 mode)
+{
+
+ yaffs_Object *obj = yaffs_CreateNewObject(dev,number,YAFFS_OBJECT_TYPE_DIRECTORY);
+ if(obj)
+ {
+ obj->fake = 1; // it is fake so it has no NAND presence...
+ obj->renameAllowed= 0; // ... and we're not allowed to rename it...
+ obj->unlinkAllowed= 0; // ... or unlink it
+ obj->deleted = 0;
+ obj->unlinked = 0;
+ obj->st_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;
+
+ yaffs_UnhashObject(tn);
+
+ // Link into the free list.
+ tn->siblings.next = (struct list_head *)(dev->freeObjects);
+ dev->freeObjects = tn;
+ dev->nFreeObjects++;
+}
+
+
+
+
+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;
+ }
+
+}
+
+
+
+
+
+
+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;
+ }
+ }
+ }
+ }
+
+ //T(("bucket %d count %d inode %d\n",bucket,yaffs_objectBucket[bucket].count,n);
+
+ return n;
+}
+
+void yaffs_HashObject(yaffs_Object *in)
+{
+ int bucket = yaffs_HashFunction(in->objectId);
+ yaffs_Device *dev = in->myDev;
+
+ if(!list_empty(&in->hashLink))
+ {
+ //YINFO("!!!");
+ }
+
+
+ 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)
+ {
+ return in;
+ }
+ }
+ }
+
+ return NULL;
+}
+
+
+
+yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type)
+{
+
+ yaffs_Object *theObject;
+
+ if(number < 0)
+ {
+ number = yaffs_CreateNewObjectNumber(dev);
+ }
+
+ theObject = yaffs_AllocateEmptyObject(dev);
+
+ if(theObject)
+ {
+ theObject->fake = 0;
+ theObject->renameAllowed = 1;
+ theObject->unlinkAllowed = 1;
+ theObject->objectId = number;
+ yaffs_HashObject(theObject);
+ theObject->variantType = type;
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_WinFileTimeNow(theObject->win_atime);
+ theObject->win_ctime[0] = theObject->win_mtime[0] = theObject->win_atime[0];
+ theObject->win_ctime[1] = theObject->win_mtime[1] = theObject->win_atime[1];
+
+#else
+
+#if defined(CONFIG_KERNEL_2_5)
+ theObject->st_atime = theObject->st_mtime = theObject->st_ctime = CURRENT_TIME.tv_sec;
+#else
+ theObject->st_atime = theObject->st_mtime = theObject->st_ctime = CURRENT_TIME;
+#endif
+#endif
+ switch(type)
+ {
+ case YAFFS_OBJECT_TYPE_FILE:
+ theObject->variant.fileVariant.fileSize = 0;
+ theObject->variant.fileVariant.scannedFileSize = 0;
+ theObject->variant.fileVariant.topLevel = 0;
+ theObject->variant.fileVariant.top = yaffs_GetTnode(dev);
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ INIT_LIST_HEAD(&theObject->variant.directoryVariant.children);
+ break;
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ // No action required
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ // No action required
+ break;
+ case YAFFS_OBJECT_TYPE_SPECIAL:
+ // No action required
+ break;
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ // todo this should not happen
+ break;
+ }
+ }
+
+ return theObject;
+}
+
+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;
+
+}
+
+YCHAR *yaffs_CloneString(const YCHAR *str)
+{
+ YCHAR *newStr = NULL;
+
+ if(str && *str)
+ {
+ newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
+ yaffs_strcpy(newStr,str);
+ }
+
+ return newStr;
+
+}
+
+//
+// Mknod (create) a new object.
+// equivalentObject only has meaning for a hard link;
+// aliasString only has meaning for a sumlink.
+// rdev only has meaning for devices (a subset of special objects)
+yaffs_Object *yaffs_MknodObject( yaffs_ObjectType type,
+ yaffs_Object *parent,
+ const YCHAR *name,
+ __u32 mode,
+ __u32 uid,
+ __u32 gid,
+ yaffs_Object *equivalentObject,
+ const YCHAR *aliasString,
+ __u32 rdev)
+{
+ yaffs_Object *in;
+
+ yaffs_Device *dev = parent->myDev;
+
+ // Check if the entry exists. If it does then fail the call since we don't want a dup.
+ if(yaffs_FindObjectByName(parent,name))
+ {
+ return NULL;
+ }
+
+ in = yaffs_CreateNewObject(dev,-1,type);
+
+ if(in)
+ {
+ in->chunkId = -1;
+ in->valid = 1;
+ in->variantType = type;
+
+ in->st_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
+#if defined(CONFIG_KERNEL_2_5)
+ in->st_atime = in->st_mtime = in->st_ctime = CURRENT_TIME.tv_sec;
+#else
+ in->st_atime = in->st_mtime = in->st_ctime = CURRENT_TIME;
+#endif
+ in->st_rdev = rdev;
+ in->st_uid = uid;
+ in->st_gid = gid;
+#endif
+ in->nDataChunks = 0;
+
+ yaffs_SetObjectName(in,name);
+ in->dirty = 1;
+
+ yaffs_AddObjectToDirectory(parent,in);
+
+ in->myDev = parent->myDev;
+
+
+ switch(type)
+ {
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ in->variant.symLinkVariant.alias = yaffs_CloneString(aliasString);
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK:
+ in->variant.hardLinkVariant.equivalentObject = equivalentObject;
+ in->variant.hardLinkVariant.equivalentObjectId = equivalentObject->objectId;
+ list_add(&in->hardLinks,&equivalentObject->hardLinks);
+ break;
+ case YAFFS_OBJECT_TYPE_FILE: // do nothing
+ case YAFFS_OBJECT_TYPE_DIRECTORY: // do nothing
+ case YAFFS_OBJECT_TYPE_SPECIAL: // do nothing
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ break;
+ }
+
+ if(/*yaffs_GetNumberOfFreeChunks(dev) <= 0 || */
+ yaffs_UpdateObjectHeader(in,name,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_DIRECTORY,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);
+}
+
+// NB 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 unlinkOp;
+ int deleteOp;
+
+ if(newDir == NULL)
+ {
+ newDir = obj->parent; // use the old directory
+ }
+
+ // 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);
+
+ // 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.
+ // Otherwise only proceed if the new name does not exist and if we're putting it into a directory.
+ if( (unlinkOp||
+ deleteOp ||
+ force ||
+ !yaffs_FindObjectByName(newDir,newName)) &&
+ 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 dletion then we mark it as a shrink for gc purposes.
+ if(yaffs_UpdateObjectHeader(obj,newName,0,deleteOp) >= 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;
+ int force = 0;
+
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+ // Special case for 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);
+ if(obj && obj->renameAllowed)
+ {
+ return yaffs_ChangeObjectName(obj,newDir,newName,force);
+ }
+ return YAFFS_FAIL;
+}
+
+
+
+static int yaffs_CheckObjectHashSanity(yaffs_Device *dev)
+{
+ // Scan the buckets and check that the lists
+ // have as many members as the count says there are
+ int bucket;
+ int countEm;
+ struct list_head *j;
+ int ok = YAFFS_OK;
+
+ for(bucket = 0; bucket < YAFFS_NOBJECT_BUCKETS; bucket++)
+ {
+ countEm = 0;
+
+ list_for_each(j,&dev->objectBucket[bucket].list)
+ {
+ countEm++;
+ }
+
+ if(countEm != dev->objectBucket[bucket].count)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("Inode hash inconsistency" TENDSTR)));
+ ok = YAFFS_FAIL;
+ }
+ }
+
+ return ok;
+}
+
+#if 0
+void yaffs_ObjectTest(yaffs_Device *dev)
+{
+ yaffs_Object *in[1000];
+ int inNo[1000];
+ yaffs_Object *inold[1000];
+ int i;
+ int j;
+
+ memset(in,0,1000*sizeof(yaffs_Object *));
+ memset(inold,0,1000*sizeof(yaffs_Object *));
+
+ yaffs_CheckObjectHashSanity(dev);
+
+ for(j = 0; j < 10; j++)
+ {
+ //T(("%d\n",j));
+
+ for(i = 0; i < 1000; i++)
+ {
+ in[i] = yaffs_CreateNewObject(dev,-1,YAFFS_OBJECT_TYPE_FILE);
+ if(!in[i])
+ {
+ YINFO("No more inodes");
+ }
+ else
+ {
+ inNo[i] = in[i]->objectId;
+ }
+ }
+
+ for(i = 0; i < 1000; i++)
+ {
+ if(yaffs_FindObjectByNumber(dev,inNo[i]) != in[i])
+ {
+ //T(("Differnce in look up test\n"));
+ }
+ else
+ {
+ // T(("Look up ok\n"));
+ }
+ }
+
+ yaffs_CheckObjectHashSanity(dev);
+
+ for(i = 0; i < 1000; i+=3)
+ {
+ yaffs_FreeObject(in[i]);
+ in[i] = NULL;
+ }
+
+
+ yaffs_CheckObjectHashSanity(dev);
+ }
+
+}
+
+#endif
+
+/////////////////////////// Block Management and Page Allocation ///////////////////
+
+
+static int yaffs_InitialiseBlocks(yaffs_Device *dev,int nBlocks)
+{
+ dev->allocationBlock = -1; // force it to get a new one
+ //Todo we're assuming the malloc will pass.
+ dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
+ // Set up dynamic blockinfo stuff.
+ dev->chunkBitmapStride = (dev->nChunksPerBlock+7)/8;
+ dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
+ 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)
+{
+ YFREE(dev->blockInfo);
+ dev->blockInfo = NULL;
+ YFREE(dev->chunkBits);
+ 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->startBlock; i <= dev->endBlock; 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);
+
+
+ return 1;
+
+}
+
+// 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;
+ yaffs_BlockInfo *bi;
+ static int nonAggressiveSkip = 0;
+
+ // If we're doing aggressive GC then we are happy to take a less-dirty block, and
+ // search harder.
+ // else (we're doing a leasurely gc), then we only bother to do this if the
+ // block has only a few pages in use.
+
+
+ nonAggressiveSkip--;
+
+ if(!aggressive &&(nonAggressiveSkip > 0))
+ {
+ return -1;
+ }
+
+ pagesInUse = (aggressive)? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
+ if(aggressive)
+ {
+ iterations = dev->endBlock - dev->startBlock + 1;
+ }
+ else
+ {
+ iterations = dev->endBlock - dev->startBlock + 1;
+ iterations = iterations / 16;
+ if(iterations > 200)
+ {
+ iterations = 200;
+ }
+ }
+
+ for(i = 0; i <= iterations && pagesInUse > 0 ; i++)
+ {
+ b++;
+ if ( b < dev->startBlock || b > dev->endBlock)
+ {
+ b = dev->startBlock;
+ }
+
+ if(b < dev->startBlock || b > dev->endBlock)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("**>> Block %d is not valid" TENDSTR),b));
+ YBUG();
+ }
+
+ bi = yaffs_GetBlockInfo(dev,b);
+
+ if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
+ (bi->pagesInUse - bi->softDeletions )< pagesInUse &&
+ yaffs_BlockNotDisqualifiedFromGC(dev,bi))
+ {
+ dirtiest = b;
+ pagesInUse = (bi->pagesInUse - bi->softDeletions);
+ }
+ }
+
+ dev->currentDirtyChecker = b;
+
+ if(dirtiest > 0)
+ {
+ T(YAFFS_TRACE_GC,(TSTR("GC Selected block %d with %d free" TENDSTR),dirtiest,dev->nChunksPerBlock - pagesInUse));
+ }
+
+ dev->oldestDirtySequence = 0; // clear this
+
+ if(dirtiest > 0)
+ {
+ nonAggressiveSkip = 4;
+ }
+
+ return dirtiest;
+}
+
+
+static void yaffs_BlockBecameDirty(yaffs_Device *dev,int blockNo)
+{
+ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,blockNo);
+
+ int erasedOk = 0;
+
+ // If the block is still healthy erase it and mark as clean.
+ // If the block has had a data failure, then retire it.
+ bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
+
+ if(!bi->needsRetiring)
+ {
+ erasedOk = yaffs_EraseBlockInNAND(dev,blockNo);
+ if(!erasedOk)
+ {
+ dev->nErasureFailures++;
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Erasure failed %d" TENDSTR),blockNo));
+ }
+ }
+
+ if(erasedOk && (yaffs_traceMask & YAFFS_TRACE_ERASE))
+ {
+ int i;
+ for(i = 0; i < dev->nChunksPerBlock; i++)
+ {
+ if(!yaffs_CheckChunkErased(dev,blockNo * dev->nChunksPerBlock + i))
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR(">>Block %d erasure supposedly OK, but chunk %d not erased" TENDSTR),blockNo,i));
+ }
+ }
+ }
+
+ if( erasedOk )
+ {
+ // Clean it up...
+ bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
+ dev->nErasedBlocks++;
+ bi->pagesInUse = 0;
+ bi->softDeletions = 0;
+ bi->hasShrinkHeader=0;
+ yaffs_ClearChunkBits(dev,blockNo);
+
+ T(YAFFS_TRACE_ERASE,(TSTR("Erased block %d" TENDSTR),blockNo));
+ }
+ else
+ {
+ yaffs_RetireBlock(dev,blockNo);
+ T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Block %d retired" TENDSTR),blockNo));
+ }
+}
+
+static void yaffs_DumpBlockStats(yaffs_Device *dev)
+{
+ int i,j;
+ yaffs_BlockInfo *bi;
+
+ for(i= dev->startBlock; i <=dev->endBlock; i++)
+ {
+ bi = yaffs_GetBlockInfo(dev,i);
+ T(YAFFS_TRACE_ALLOCATE,(TSTR("%3d state %d shrink %d inuse %d/%d seq %d pages"),i,
+ bi->blockState,bi->hasShrinkHeader,bi->pagesInUse,bi->softDeletions,bi->sequenceNumber));
+
+ for(j = 0; j < dev->nChunksPerBlock; j++)
+ {
+ if(yaffs_CheckChunkBit(dev,i,j))
+ {
+ T(YAFFS_TRACE_ALLOCATE,(TSTR(" %d"),j));
+
+ }
+ }
+ T(YAFFS_TRACE_ALLOCATE,(TSTR(" " TENDSTR)));
+
+ }
+}
+
+
+static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
+{
+ int i;
+
+ yaffs_BlockInfo *bi;
+
+#if 0
+ static int j = 0;
+ j++;
+ if(j < 0 || j > 100)
+ {
+ j = 0;
+ yaffs_DumpBlockStats(dev);
+ }
+
+#endif
+
+ 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->startBlock; i <= dev->endBlock; i++)
+ {
+ dev->allocationBlockFinder++;
+ if(dev->allocationBlockFinder < dev->startBlock || dev->allocationBlockFinder> dev->endBlock)
+ {
+ dev->allocationBlockFinder = dev->startBlock;
+ }
+
+ 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" TENDSTR),dev->allocationBlockFinder,dev->sequenceNumber));
+ return dev->allocationBlockFinder;
+ }
+ }
+ T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no more eraased blocks, but there should have been one" TENDSTR)));
+
+
+ return -1;
+}
+
+
+
+static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve)
+{
+ 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 && dev->nErasedBlocks </*=*/ dev->nReservedBlocks)
+ {
+ // 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;
+ }
+
+
+ return retVal;
+
+ }
+ T(YAFFS_TRACE_ERROR,(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
+
+ return -1;
+}
+
+
+// To determine if we have enough space we just look at the
+// number of erased blocks.
+// The cache is allowed to use reserved blocks.
+
+static int yaffs_CheckSpaceForChunkCache(yaffs_Device *dev)
+{
+ return (dev->nErasedBlocks >= dev->nReservedBlocks);
+}
+
+
+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;
+
+}
+
+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 chunksBefore = yaffs_GetErasedChunks(dev);
+ int chunksAfter;
+
+ yaffs_ExtendedTags tags;
+
+ yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,block);
+
+ yaffs_Object *object;
+
+ 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));
+ //T(("Collecting block %d n %d bits %x\n",block, bi->pagesInUse, bi->pageBits));
+
+ bi->hasShrinkHeader = 0; // clear the flag so that the block can erase
+
+
+ if(!yaffs_StillSomeChunkBits(dev,block))
+ {
+ T(YAFFS_TRACE_TRACING,(TSTR("Collecting block %d that has no chunks in use" TENDSTR),block));
+ yaffs_BlockBecameDirty(dev,block);
+ }
+ else
+ {
+
+ __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
+
+ for(chunkInBlock = 0,oldChunk = block * dev->nChunksPerBlock;
+ chunkInBlock < dev->nChunksPerBlock && yaffs_StillSomeChunkBits(dev,block);
+ chunkInBlock++, oldChunk++ )
+ {
+ if(yaffs_CheckChunkBit(dev,block,chunkInBlock))
+ {
+
+ // This page is in use and might need to be copied off
+
+ markNAND = 1;
+
+ //T(("copying page %x from %d to %d\n",mask,oldChunk,newChunk));
+
+ yaffs_InitialiseTags(&tags);
+
+ yaffs_ReadChunkWithTagsFromNAND(dev,oldChunk,buffer, &tags);
+
+ object = yaffs_FindObjectByNumber(dev,tags.objectId);
+
+ T(YAFFS_TRACE_GC_DETAIL,(TSTR("Collecting page %d, %d %d %d " TENDSTR),chunkInBlock,tags.objectId,tags.chunkId,tags.byteCount));
+
+ if(!object)
+ {
+ T(YAFFS_TRACE_ERROR,(TSTR("page %d in gc has no object " TENDSTR),oldChunk));
+ }
+
+ if(object && object->deleted && tags.chunkId != 0)
+ {
+ // Data chunk in a deleted file, throw it away
+ // It's a deleted data chunk,
+ // No need to copy this, just forget about it and fix up the
+ // object.
+
+ //yaffs_PutChunkIntoFile(object, tags.chunkId, 0,0);
+ 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++;
+
+ 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);
+ }
+
+ }
+
+ }
+
+ if(chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev)))
+ {
+ T(YAFFS_TRACE_GC,(TSTR("gc did not increase free chunks before %d after %d" TENDSTR),chunksBefore,chunksAfter));
+ }
+
+ return YAFFS_OK;
+}
+
+#if 0
+static yaffs_Object *yaffs_FindDeletedUnlinkedFile(yaffs_Device *dev)
+{
+ // find a file to delete
+ struct list_head *i;
+ yaffs_Object *l;
+
+
+ //Scan the unlinked files looking for one to delete
+ list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
+ {
+ if(i)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+ if(l->deleted)
+ {
+ return l;
+ }
+ }
+ }
+ return NULL;
+}
+
+
+static void yaffs_DoUnlinkedFileDeletion(yaffs_Device *dev)
+{
+ // This does background deletion on unlinked files.. only deleted ones.
+ // If we don't have a file we're working on then find one
+ if(!dev->unlinkedDeletion && dev->nDeletedFiles > 0)
+ {
+ dev->unlinkedDeletion = yaffs_FindDeletedUnlinkedFile(dev);
+ }
+
+ // OK, we're working on a file...
+ if(dev->unlinkedDeletion)
+ {
+ yaffs_Object *obj = dev->unlinkedDeletion;
+ int delresult;
+ int limit; // Number of chunks to delete in a file.
+ // NB this can be exceeded, but not by much.
+
+ limit = -1;
+
+ delresult = yaffs_DeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0,&limit);
+
+ if(obj->nDataChunks == 0)
+ {
+ // Done all the deleting of data chunks.
+ // Now dump the header and clean up
+ yaffs_FreeTnode(dev,obj->variant.fileVariant.top);
+ obj->variant.fileVariant.top = NULL;
+ yaffs_DoGenericObjectDeletion(obj);
+ dev->nDeletedFiles--;
+ dev->nUnlinkedFiles--;
+ dev->nBackgroundDeletions++;
+ dev->unlinkedDeletion = NULL;
+ }
+ }
+}
+
+#endif
+
+#if 0
+#define YAFFS_GARBAGE_COLLECT_LOW_WATER 2
+static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
+{
+ int block;
+ int aggressive=0;
+
+ //yaffs_DoUnlinkedFileDeletion(dev);
+
+ if(dev->nErasedBlocks <= (dev->nReservedBlocks + YAFFS_GARBAGE_COLLECT_LOW_WATER))
+ {
+ aggressive = 1;
+ }
+
+ if(aggressive)
+ {
+ block = yaffs_FindBlockForGarbageCollection(dev,aggressive);
+
+ if(block >= 0)
+ {
+ dev->garbageCollections++;
+ return yaffs_GarbageCollectBlock(dev,block);
+ }
+ else
+ {
+ return YAFFS_FAIL;
+ }
+ }
+
+ return YAFFS_OK;
+}
+#endif
+
+// 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 dirtier blocks.
+// Passive gc only inspects smaller areas and will only accept cleaner blocks.
+//
+// The idea is to help clear out space in a more spread-out manner.
+// Dunno if it really does anything useful.
+//
+int yaffs_CheckGarbageCollection(yaffs_Device *dev)
+{
+ int block;
+ int aggressive;
+ int gcOk;
+ int maxTries = 0;
+
+ //yaffs_DoUnlinkedFileDeletion(dev);
+
+ // This loop should pass the first time.
+ // We'll only see looping here if the erase of the collected block fails.
+
+ do{
+ maxTries++;
+ if(dev->nErasedBlocks <= (dev->nReservedBlocks + 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 + 1))
+ {
+ 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 + 1)) && (block > 0) && (maxTries < 5));
+
+ return aggressive ? gcOk: YAFFS_OK;
+}
+
+
+//////////////////////////// TAGS ///////////////////////////////////////
+
+
+void yaffs_InitialiseTags(yaffs_ExtendedTags *tags)
+{
+ memset(tags,0,sizeof(yaffs_ExtendedTags));
+ tags->validMarker0 = 0xAAAAAAAA;
+ tags->validMarker1 = 0x55555555;
+}
+
+static int yaffs_ValidateTags(yaffs_ExtendedTags *tags)
+{
+ return (tags->validMarker0 == 0xAAAAAAAA && tags->validMarker1 == 0x55555555);
+
+}
+
+
+#if 0
+
+void yaffs_CalcTagsECC(yaffs_Tags *tags)
+{
+ // Calculate an ecc
+
+ unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
+ unsigned i,j;
+ unsigned ecc = 0;
+ unsigned bit = 0;
+
+ tags->ecc = 0;
+
+ for(i = 0; i < 8; i++)
+ {
+ for(j = 1; j &0xff; j<<=1)
+ {
+ bit++;
+ if(b[i] & j)
+ {
+ ecc ^= bit;
+ }
+ }
+ }
+
+ tags->ecc = ecc;
+
+
+}
+
+int yaffs_CheckECCOnTags(yaffs_Tags *tags)
+{
+ unsigned ecc = tags->ecc;
+
+ yaffs_CalcTagsECC(tags);
+
+ ecc ^= tags->ecc;
+
+ if(ecc && ecc <= 64)
+ {
+ // TODO: Handle the failure better. Retire?
+ unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
+
+ ecc--;
+
+ b[ecc / 8] ^= (1 << (ecc & 7));
+
+ // Now recvalc the ecc
+ yaffs_CalcTagsECC(tags);
+
+ return 1; // recovered error
+ }
+ else if(ecc)
+ {
+ // Wierd ecc failure value
+ // TODO Need to do somethiong here
+ return -1; //unrecovered error
+ }
+
+ return 0;
+}
+
+static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr)
+{
+ yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
+
+ yaffs_CalcTagsECC(tagsPtr);
+
+ sparePtr->tagByte0 = tu->asBytes[0];
+ sparePtr->tagByte1 = tu->asBytes[1];
+ sparePtr->tagByte2 = tu->asBytes[2];
+ sparePtr->tagByte3 = tu->asBytes[3];
+ sparePtr->tagByte4 = tu->asBytes[4];
+ sparePtr->tagByte5 = tu->asBytes[5];
+ sparePtr->tagByte6 = tu->asBytes[6];
+ sparePtr->tagByte7 = tu->asBytes[7];
+}
+
+static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr)
+{
+ yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
+ int result;
+
+ tu->asBytes[0]= sparePtr->tagByte0;
+ tu->asBytes[1]= sparePtr->tagByte1;
+ tu->asBytes[2]= sparePtr->tagByte2;
+ tu->asBytes[3]= sparePtr->tagByte3;
+ tu->asBytes[4]= sparePtr->tagByte4;
+ tu->asBytes[5]= sparePtr->tagByte5;
+ tu->asBytes[6]= sparePtr->tagByte6;
+ tu->asBytes[7]= sparePtr->tagByte7;
+
+ result = yaffs_CheckECCOnTags(tagsPtr);
+ if(result> 0)
+ {
+ dev->tagsEccFixed++;
+ }
+ else if(result <0)
+ {
+ dev->tagsEccUnfixed++;
+ }
+}
+
+static void yaffs_SpareInitialise(yaffs_Spare *spare)
+{
+ memset(spare,0xFF,sizeof(yaffs_Spare));
+}
+
+#endif
+
+#if 0
+static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_ExtendedTags *tags, int useReserve)
+{
+ // NB There must be tags, data is optional
+ // If there is data, then an ECC is calculated on it.
+
+ yaffs_Spare spare;
+
+ if(!tags)
+ {
+ return YAFFS_FAIL;
+ }
+
+ //yaffs_SpareInitialise(&spare);
+
+ //if(!dev->useNANDECC && buffer)
+ //{
+ // yaffs_CalcECC(buffer,&spare);
+ //}
+
+ //yaffs_LoadTagsIntoSpare(&spare,tags);
+
+ return yaffs_WriteNewChunkToNAND(dev,buffer,&spare,useReserve);
+
+}
+#endif
+
+static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId, int chunkInObject)
+{
+ return ( tags->chunkId == chunkInObject &&
+ tags->objectId == objectId &&
+ !tags->chunkDeleted) ? 1 : 0;
+
+}
+
+
+
+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 = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
+
+ retVal = yaffs_FindChunkInGroup(dev,theChunk,tags,in->objectId,chunkInInode);
+ }
+ return retVal;
+}
+
+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 = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
+
+ retVal = yaffs_FindChunkInGroup(dev,theChunk,tags,in->objectId,chunkInInode);
+
+ // Delete the entry in the filestructure (if found)
+ if(retVal != -1)
+ {
+ tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = 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->nBytesPerChunk -1)/in->myDev->nBytesPerChunk;
+
+ for(chunk = 1; chunk <= nChunks; chunk++)
+ {
+ tn = yaffs_FindLevel0Tnode(in->myDev,&in->variant.fileVariant, chunk);
+
+ if(tn)
+ {
+
+ theChunk = tn->level0[chunk & YAFFS_TNODES_LEVEL0_MASK] << in->myDev->chunkGroupBits;
+
+ 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
+ {
+ //T(("File problem file [%d,%d] NAND %d tags[%d,%d]\n",
+ // objId,chunk,theChunk,tags->chunkId,tags->objectId);
+
+ 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)
+{
+ yaffs_Tnode *tn;
+ yaffs_Device *dev = in->myDev;
+ int existingChunk;
+ yaffs_ExtendedTags existingTags;
+ yaffs_ExtendedTags newTags;
+ unsigned existingSerial, newSerial;
+
+ tn = yaffs_AddOrFindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
+ if(!tn)
+ {
+ return YAFFS_FAIL;
+ }
+
+ existingChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK];
+
+ if(inScan)
+ {
+ // 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.
+
+
+ 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
+ // To do this we get both sets of tags and compare serial numbers.
+ 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( in->myDev->isYaffs2 ||
+ existingChunk <= 0 ||
+ ((existingSerial+1) & 3) == newSerial)
+ {
+ // Use new
+ // Delete the old one and drop through to update the tnode
+ yaffs_DeleteChunk(dev,existingChunk,1,__LINE__);
+ }
+ else
+ {
+ // 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++;
+ }
+
+ tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = (chunkInNAND >> dev->chunkGroupBits);
+
+ return YAFFS_OK;
+}
+
+
+
+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));
+
+ memset(buffer,0,in->myDev->nBytesPerChunk); // get sane data if you read a hole
+ return 0;
+ }
+
+}
+
+
+void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId,int markNAND,int lyn)
+{
+ int block;
+ int page;
+ yaffs_ExtendedTags tags;
+ yaffs_BlockInfo *bi;
+
+ if(chunkId <= 0) return;
+
+ dev->nDeletions++;
+ block = chunkId / dev->nChunksPerBlock;
+ page = chunkId % dev->nChunksPerBlock;
+
+ bi = yaffs_GetBlockInfo(dev,block);
+
+ T(YAFFS_TRACE_DELETION,(TSTR("line %d delete of chunk %d" TENDSTR),lyn,chunkId));
+
+ if(markNAND &&
+ bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
+ !dev->isYaffs2)
+ {
+// yaffs_SpareInitialise(&spare);
+
+#ifdef CONFIG_MTD_NAND_VERIFY_WRITE
+
+ //read data before write, to ensure correct ecc
+ //if we're using MTD verification under Linux
+ yaffs_ReadChunkFromNAND(dev,chunkId,NULL,&spare,0);
+#endif
+
+ 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));
+ }
+
+}
+
+
+
+
+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;
+
+// yaffs_CalcTagsECC(&newTags);
+
+ 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)
+{
+
+ yaffs_BlockInfo *bi;
+
+ yaffs_Device *dev = in->myDev;
+
+ int prevChunkId;
+ int retVal = 0;
+
+ int newChunkId;
+ yaffs_ExtendedTags newTags;
+
+ __u8 *buffer = NULL;
+ YCHAR oldName[YAFFS_MAX_NAME_LENGTH+1];
+
+ // __u8 bufferOld[YAFFS_BYTES_PER_CHUNK];
+
+ yaffs_ObjectHeader *oh = NULL;
+ // yaffs_ObjectHeader *ohOld = (yaffs_ObjectHeader *)bufferOld;
+
+
+ if(!in->fake || force)
+ {
+
+ yaffs_CheckGarbageCollection(dev);
+
+ buffer = yaffs_GetTempBuffer(in->myDev,__LINE__);
+ oh = (yaffs_ObjectHeader *)buffer;
+
+ prevChunkId = in->chunkId;
+
+ if(prevChunkId >= 0)
+ {
+ yaffs_ReadChunkWithTagsFromNAND(dev,prevChunkId,buffer,NULL);
+ memcpy(oldName,oh->name,sizeof(oh->name));
+ }
+
+ memset(buffer,0xFF,dev->nBytesPerChunk);
+
+ // Header data
+ oh->type = in->variantType;
+
+ oh->st_mode = in->st_mode;
+
+#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->st_uid = in->st_uid;
+ oh->st_gid = in->st_gid;
+ oh->st_atime = in->st_atime;
+ oh->st_mtime = in->st_mtime;
+ oh->st_ctime = in->st_ctime;
+ oh->st_rdev = in->st_rdev;
+#endif
+ if(in->parent)
+ {
+ oh->parentObjectId = in->parent->objectId;
+ }
+ else
+ {
+ oh->parentObjectId = 0;
+ }
+
+ //oh->sum = in->sum;
+ if(name && *name)
+ {
+ memset(oh->name,0,sizeof(oh->name));
+ yaffs_strncpy(oh->name,name,YAFFS_MAX_NAME_LENGTH);
+ }
+ else if(prevChunkId)
+ {
+ memcpy(oh->name, oldName,sizeof(oh->name));
+ }
+ else
+ {
+ memset(oh->name,0,sizeof(oh->name));
+ }
+
+ oh->isShrink = isShrink;
+
+ switch(in->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ // Should not happen
+ break;
+ case YAFFS_OBJECT_TYPE_FILE:
+ oh->fileSize = 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;
+
+
+ // 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__);
+ }
+
+ 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 siturations 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.
+// There are a limited number (~10) of cache chunks per device so that we don't
+// need a very intelligent search.
+
+
+
+
+
+static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
+{
+ yaffs_Device *dev = obj->myDev;
+ int lowest;
+ int i;
+ yaffs_ChunkCache *cache;
+ int chunkWritten;
+ //int nBytes;
+ 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
+
+#if 0
+ nBytes = cache->object->variant.fileVariant.fileSize - ((cache->chunkId -1) * YAFFS_BYTES_PER_CHUNK);
+
+ if(nBytes > YAFFS_BYTES_PER_CHUNK)
+ {
+ nBytes= YAFFS_BYTES_PER_CHUNK;
+ }
+#endif
+ 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)));
+
+ }
+ }
+
+}
+
+
+// Grab us a 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)
+ {
+ //T(("Grabbing empty %d\n",i));
+
+ //printf("Grabbing empty %d\n",i);
+
+ 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;
+ }
+ }
+
+ //T(("Grabbing non-empty %d\n",theOne));
+
+ //if(theOne >= 0) printf("Grabbed non-empty cache %d\n",theOne);
+
+ 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.
+
+ theObj = NULL;
+ usage = 0;
+ cache = NULL;
+ pushout = 0;
+
+ 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)
+ {
+
+ //printf("Dirty ");
+ yaffs_FlushFilesChunkCache(theObj);
+
+ // Try again
+ cache = yaffs_GrabChunkCacheWorker(dev);
+ }
+ else
+ {
+ //printf(" pushout %d\n",pushout);
+ }
+
+ }
+
+ 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)
+ {
+ // Now invalidate it.
+ for(i = 0; i < dev->nShortOpCaches; i++)
+ {
+ if(dev->srCache[i].object == in)
+ {
+ dev->srCache[i].object = NULL;
+ }
+ }
+ }
+}
+
+
+
+
+
+///////////////////////// 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, __u32 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->nBytesPerChunk + 1; // The first chunk is 1
+ start = offset % dev->nBytesPerChunk;
+
+ // OK now check for the curveball where the start and end are in
+ // the same chunk.
+ if( (start + n) < dev->nBytesPerChunk)
+ {
+ nToCopy = n;
+ }
+ else
+ {
+ nToCopy = dev->nBytesPerChunk - 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->nBytesPerChunk)
+ {
+ 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->nBytesPerChunk);
+
+#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, __u32 offset, int nBytes)
+{
+
+ 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->nBytesPerChunk + 1;
+ start = offset % dev->nBytesPerChunk;
+
+
+ // OK now check for the curveball where the start and end are in
+ // the same chunk.
+
+ if( (start + n) < dev->nBytesPerChunk)
+ {
+ 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->nBytesPerChunk);
+
+ if(nBytesRead > dev->nBytesPerChunk)
+ {
+ nBytesRead = dev->nBytesPerChunk;
+ }
+
+ nToWriteBack = (nBytesRead > (start + n)) ? nBytesRead : (start +n);
+
+ }
+ else
+ {
+ nToCopy = dev->nBytesPerChunk - start;
+ nToWriteBack = dev->nBytesPerChunk;
+ }
+
+ if(nToCopy != dev->nBytesPerChunk)
+ {
+ // 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 it up.
+ cache = yaffs_FindChunkCache(in,chunk);
+ if(!cache && yaffs_CheckSpaceForChunkCache(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);
+ }
+
+ 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;
+ }
+ 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__);
+
+ //T(("Write with readback to chunk %d %d start %d copied %d wrote back %d\n",chunk,chunkWritten,start, nToCopy, nToWriteBack));
+ }
+
+ }
+ 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->nBytesPerChunk);
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_LockYAFFS(TRUE);
+#endif
+ chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,localBuffer,dev->nBytesPerChunk,0);
+ yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
+#else
+ // A full chunk. Write directly from the supplied buffer.
+ chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,buffer,dev->nBytesPerChunk,0);
+#endif
+ // Since we've overwritten the cached data, we better invalidate it.
+ yaffs_InvalidateChunkCache(in,chunk);
+ //T(("Write to chunk %d %d\n",chunk,chunkWritten));
+ }
+
+ 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;
+}
+
+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->nBytesPerChunk;
+
+ int startDel = 1 + (newSize + dev->nBytesPerChunk - 1)/
+ dev->nBytesPerChunk;
+ 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->startBlock * dev->nChunksPerBlock) ||
+ chunkId >= ((dev->endBlock+1) * dev->nChunksPerBlock))
+ {
+ T(YAFFS_TRACE_ALWAYS,("Found daft chunkId %d for %d\n",chunkId,i));
+ }
+ else
+ {
+ in->nDataChunks--;
+ yaffs_DeleteChunk(dev,chunkId,1,__LINE__);
+ }
+ }
+ }
+
+}
+
+int yaffs_ResizeFile(yaffs_Object *in, int newSize)
+{
+
+ int oldFileSize = in->variant.fileVariant.fileSize;
+ int sizeOfPartialChunk;
+ yaffs_Device *dev = in->myDev;
+
+ sizeOfPartialChunk = newSize % dev->nBytesPerChunk;
+
+
+ yaffs_FlushFilesChunkCache(in);
+ yaffs_InvalidateWholeChunkCache(in);
+
+ yaffs_CheckGarbageCollection(dev);
+
+ if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
+ {
+ return yaffs_GetFileSize(in);
+ }
+
+ if(newSize < oldFileSize)
+ {
+
+ yaffs_PruneResizedChunks(in,newSize);
+
+ if(sizeOfPartialChunk != 0)
+ {
+ int lastChunk = 1+ newSize/dev->nBytesPerChunk;
+ __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 + sizeOfPartialChunk,0, dev->nBytesPerChunk - sizeOfPartialChunk);
+
+ yaffs_WriteChunkDataToObject(in,lastChunk,localBuffer,sizeOfPartialChunk,1);
+
+ yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
+ }
+
+ in->variant.fileVariant.fileSize = newSize;
+
+ yaffs_PruneFileStructure(dev,&in->variant.fileVariant);
+
+ // TODO write a new object header to show we've shrunk the file
+ // Do this only if the file is not in the deleted directory.
+ if(in->parent->objectId != YAFFS_OBJECTID_UNLINKED)
+ {
+ yaffs_UpdateObjectHeader(in,NULL, 0, 1);
+ }
+
+
+ return newSize;
+
+ }
+ else
+ {
+ return oldFileSize;
+ }
+}
+
+
+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;
+ }
+}
+
+
+
+// yaffs_FlushFile() updates the file's
+// objectId in NAND
+
+int yaffs_FlushFile(yaffs_Object *in, int updateTime)
+{
+ int retVal;
+ if(in->dirty)
+ {
+ //T(("flushing object header\n"));
+
+ yaffs_FlushFilesChunkCache(in);
+ if(updateTime)
+ {
+#ifdef CONFIG_YAFFS_WINCE
+ yfsd_WinFileTimeNow(in->win_mtime);
+#else
+#if defined(CONFIG_KERNEL_2_5)
+ in->st_mtime = CURRENT_TIME.tv_sec;
+#else
+ in->st_mtime = CURRENT_TIME;
+#endif
+#endif
+ }
+
+ retVal = (yaffs_UpdateObjectHeader(in,NULL,0,0) >= 0)? YAFFS_OK : YAFFS_FAIL;
+ }
+ else
+ {
+ retVal = YAFFS_OK;
+ }
+
+ return retVal;
+
+}
+
+
+static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
+{
+
+ // First off, invalidate the file's data in the cache, without flushing.
+ yaffs_InvalidateWholeChunkCache(in);
+
+ if(in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir))
+ {
+ // Move to the unlinked directory so we have a record that it was deleted.
+ yaffs_ChangeObjectName(in, in->myDev->deletedDir,NULL,0);
+
+ }
+
+
+ yaffs_RemoveObjectFromDirectory(in);
+ yaffs_DeleteChunk(in->myDev,in->chunkId,1,__LINE__);
+ in->chunkId = -1;
+
+#ifdef __KERNEL__
+ if(in->myInode)
+ {
+ in->myInode->u.generic_ip = NULL;
+ in->myInode = 0;
+ }
+#endif
+ 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)
+{
+
+#ifdef CONFIG_YAFFS_DISABLE_BACKGROUND_DELETION
+
+ // Delete the file data & tnodes
+
+ yaffs_DeleteWorker(in, in->variant.fileVariant.top, in->variant.fileVariant.topLevel, 0,NULL);
+
+
+ yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);
+
+ return yaffs_DoGenericObjectDeletion(in);
+#else
+ int retVal;
+ int immediateDeletion=0;
+
+ if(1)
+ {
+ //in->unlinked = 1;
+ //in->myDev->nUnlinkedFiles++;
+ //in->renameAllowed = 0;
+#ifdef __KERNEL__
+ if(!in->myInode)
+ {
+ immediateDeletion = 1;
+
+ }
+#else
+ if(in->inUse <= 0)
+ {
+ immediateDeletion = 1;
+
+ }
+#endif
+ if(immediateDeletion)
+ {
+ retVal = yaffs_ChangeObjectName(in, in->myDev->deletedDir,NULL,0);
+ T(YAFFS_TRACE_TRACING,(TSTR("yaffs: immediate deletion of file %d" TENDSTR),in->objectId));
+ in->deleted=1;
+ in->myDev->nDeletedFiles++;
+ yaffs_SoftDeleteFile(in);
+ }
+ else
+ {
+ retVal = yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,NULL,0);
+ }
+
+ }
+ return retVal;
+
+
+#endif
+}
+
+int yaffs_DeleteFile(yaffs_Object *in)
+{
+ int retVal = YAFFS_OK;
+
+ if(in->nDataChunks > 0)
+ {
+ // Use soft deletion
+ 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);
+
+ 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_HARDLINK:
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ default:
+ return YAFFS_FAIL;
+ }
+ }
+}
+
+int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
+{
+ yaffs_Object *obj;
+
+ obj = yaffs_FindObjectByName(dir,name);
+
+ if(obj && obj->unlinkAllowed)
+ {
+ return yaffs_UnlinkWorker(obj);
+ }
+
+ return YAFFS_FAIL;
+
+}
+
+//////////////// Initialisation Scanning /////////////////
+
+
+#if 0
+// For now we use the SmartMedia check.
+// We look at the blockStatus byte in the first two chunks
+// These must be 0xFF to pass as OK.
+// todo: this function needs to be modifyable foir different NAND types
+// and different chunk sizes. Suggest make this into a per-device configurable
+// function.
+static int yaffs_IsBlockBad(yaffs_Device *dev, int blk)
+{
+ yaffsExtendedTags *tags;
+
+ yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock,NULL,&tags,1);
+#if 1
+ if(yaffs_CountBits(spare.blockStatus) < 7)
+ {
+ return 1;
+ }
+#else
+ if(spare.blockStatus != 0xFF)
+ {
+ return 1;
+ }
+#endif
+ yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock + 1,NULL,&spare,1);
+
+#if 1
+ if(yaffs_CountBits(spare.blockStatus) < 7)
+ {
+ return 1;
+ }
+#else
+ if(spare.blockStatus != 0xFF)
+ {
+ return 1;
+ }
+#endif
+
+ return 0;
+
+}
+
+#endif
+
+
+typedef struct
+{
+ int seq;
+ int block;
+} yaffs_BlockIndex;
+
+
+
+static int yaffs_Scan(yaffs_Device *dev)
+{
+ yaffs_ExtendedTags tags;
+ int blk;
+ int blockIterator;
+ int startIterator;
+ int endIterator;
+ int nBlocksToScan = 0;
+
+ int chunk;
+ int c;
+ int deleted;
+ yaffs_BlockState state;
+ yaffs_Object *hardList = NULL;
+ yaffs_Object *hl;
+ yaffs_BlockInfo *bi;
+ int sequenceNumber;
+ yaffs_ObjectHeader *oh;
+ yaffs_Object *in;
+ yaffs_Object *parent;
+ int nBlocks = dev->endBlock - dev->startBlock + 1;
+
+ __u8 *chunkData;
+
+ yaffs_BlockIndex *blockIndex = NULL;
+
+ chunkData = yaffs_GetTempBuffer(dev,__LINE__);
+
+
+ dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+ if(dev->isYaffs2)
+ {
+ blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
+ }
+
+
+ // Scan all the blocks to determine their state
+ for(blk = dev->startBlock; blk <= dev->endBlock; 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(state == YAFFS_BLOCK_STATE_DEAD)
+ {
+ T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("block %d is bad" TENDSTR),blk));
+ }
+ else if(state == YAFFS_BLOCK_STATE_EMPTY)
+ {
+ 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;
+ }
+ else
+ {
+ startIterator = dev->startBlock;
+ endIterator = dev->endBlock;
+ }
+
+ for(blockIterator = startIterator; blockIterator <= endIterator; blockIterator++)
+ {
+
+ if(dev->isYaffs2)
+ {
+ // get the block to scan in the correct order
+ blk = blockIndex[blockIterator].block;
+ }
+ else
+ {
+ blk = blockIterator;
+ }
+
+
+ bi = yaffs_GetBlockInfo(dev,blk);
+ state = bi->blockState;
+
+ deleted = 0;
+
+ for(c = 0; c < dev->nChunksPerBlock &&
+ state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++)
+ {
+ // Read the tags and decide what to do
+ chunk = blk * dev->nChunksPerBlock + c;
+
+ yaffs_ReadChunkWithTagsFromNAND(dev,chunk,NULL,&tags);
+
+ // Let's have a good look at this chunk...
+
+
+ if(!dev->isYaffs2 && tags.chunkDeleted)
+ {
+ // 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)
+ {
+ int endpos;
+ // A data chunk.
+ yaffs_SetChunkBit(dev,blk,c);
+ bi->pagesInUse++;
+
+ in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE);
+ // PutChunkIntoFIle checks for a clash (two data chunks with
+ // the same chunkId).
+ yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,1);
+ endpos = (tags.chunkId - 1)* dev->nBytesPerChunk + tags.byteCount;
+ if(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++;
+
+ yaffs_ReadChunkWithTagsFromNAND(dev,chunk,chunkData,NULL);
+
+ oh = (yaffs_ObjectHeader *)chunkData;
+
+ in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type);
+
+ if(in->valid)
+ {
+ // We have already filled this one. We have a duplicate and need to resolve it.
+
+ unsigned existingSerial = in->serial;
+ unsigned newSerial = tags.serialNumber;
+
+ if( dev->isYaffs2 ||
+ ((existingSerial+1) & 3) == newSerial)
+ {
+ // Use new one - destroy the exisiting one
+ yaffs_DeleteChunk(dev,in->chunkId,1,__LINE__);
+ in->valid = 0;
+ }
+ else
+ {
+ // Use existing - destroy this one.
+ yaffs_DeleteChunk(dev,chunk,1,__LINE__);
+ }
+ }
+
+ if(!in->valid &&
+ (tags.objectId == YAFFS_OBJECTID_ROOT ||
+ tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
+ {
+ // We only load some info, don't fiddle with directory structure
+ in->valid = 1;
+ in->variantType = oh->type;
+
+ in->st_mode = oh->st_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->st_uid = oh->st_uid;
+ in->st_gid = oh->st_gid;
+ in->st_atime = oh->st_atime;
+ in->st_mtime = oh->st_mtime;
+ in->st_ctime = oh->st_ctime;
+ in->st_rdev = oh->st_rdev;
+#endif
+ in->chunkId = chunk;
+
+ }
+ else if(!in->valid)
+ {
+ // we need to load this info
+
+ in->valid = 1;
+ in->variantType = oh->type;
+
+ in->st_mode = oh->st_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->st_uid = oh->st_uid;
+ in->st_gid = oh->st_gid;
+ in->st_atime = oh->st_atime;
+ in->st_mtime = oh->st_mtime;
+ in->st_ctime = oh->st_ctime;
+ in->st_rdev = oh->st_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: // Do nothing
+ in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias);
+ break;
+ }
+
+ if(parent == dev->deletedDir)
+ {
+ yaffs_DestroyObject(in);
+ bi->hasShrinkHeader = 1;
+ }
+ //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType));
+ }
+ }
+ }
+
+ 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.
+ 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);
+
+ }
+
+ }
+
+ {
+ 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);
+ if(l->deleted)
+ {
+ yaffs_DestroyObject(l);
+ }
+ }
+ }
+ }
+
+ yaffs_ReleaseTempBuffer(dev,chunkData,__LINE__);
+ return YAFFS_OK;
+}
+
+
+
+////////////////////////// Directory Functions /////////////////////////
+
+
+static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj)
+{
+
+ 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
+ list_del_init(&obj->siblings);
+ }
+ // 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;
+ }
+}
+
+static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
+{
+ list_del_init(&obj->siblings);
+ obj->parent = NULL;
+}
+
+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;
+
+ sum = yaffs_CalcNameSum(name);
+
+ list_for_each(i,&directory->variant.directoryVariant.children)
+ {
+ if(i)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+
+ // Special case for lost-n-found
+ if(l->objectId == YAFFS_OBJECTID_LOSTNFOUND)
+ {
+ if(yaffs_strcmp(name,YAFFS_LOSTNFOUND_NAME) == 0)
+ {
+ return l;
+ }
+ }
+ else if(yaffs_SumCompare(l->sum, sum)||
+ l->chunkId <= 0) //LostnFound cunk called Objxxx
+ {
+ // Do a real check
+ yaffs_GetObjectName(l,buffer,YAFFS_MAX_NAME_LENGTH);
+ if(yaffs_strcmp(name,buffer) == 0)
+ {
+ return l;
+ }
+
+ }
+ }
+ }
+
+ return NULL;
+}
+
+
+int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *))
+{
+ struct list_head *i;
+ yaffs_Object *l;
+
+
+ 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;
+
+}
+
+
+// GetEquivalentObject dereferences any hard links to get to the
+// actual object.
+
+yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
+{
+ if(obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
+ {
+ // We want the object id of the equivalent object, not this one
+ obj = obj->variant.hardLinkVariant.equivalentObject;
+ }
+ return obj;
+
+}
+
+int yaffs_GetObjectName(yaffs_Object *obj,YCHAR *name,int buffSize)
+{
+ memset(name,0,buffSize * sizeof(YCHAR));
+
+ 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
+ {
+ __u8 *buffer = yaffs_GetTempBuffer(obj->myDev,__LINE__);
+
+ yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
+
+ memset(buffer,0,obj->myDev->nBytesPerChunk);
+
+ if(obj->chunkId >= 0)
+ {
+ 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->nBytesPerChunk;
+ }
+}
+
+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->st_mode)) return DT_FIFO;
+ if(S_ISCHR(obj->st_mode)) return DT_CHR;
+ if(S_ISBLK(obj->st_mode)) return DT_BLK;
+ if(S_ISSOCK(obj->st_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->st_mode = attr->ia_mode;
+ if(valid & ATTR_UID) obj->st_uid = attr->ia_uid;
+ if(valid & ATTR_GID) obj->st_gid = attr->ia_gid;
+
+#if defined(CONFIG_KERNEL_2_5)
+ if(valid & ATTR_ATIME) obj->st_atime = attr->ia_atime.tv_sec;
+ if(valid & ATTR_CTIME) obj->st_ctime = attr->ia_ctime.tv_sec;
+ if(valid & ATTR_MTIME) obj->st_mtime = attr->ia_mtime.tv_sec;
+#else
+ if(valid & ATTR_ATIME) obj->st_atime = attr->ia_atime;
+ if(valid & ATTR_CTIME) obj->st_ctime = attr->ia_ctime;
+ if(valid & ATTR_MTIME) obj->st_mtime = attr->ia_mtime;
+#endif
+
+ if(valid & ATTR_SIZE) yaffs_ResizeFile(obj,attr->ia_size);
+
+ yaffs_UpdateObjectHeader(obj,NULL,1,0);
+
+ return YAFFS_OK;
+
+}
+int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
+{
+ unsigned int valid = 0;
+
+ attr->ia_mode = obj->st_mode; valid |= ATTR_MODE;
+ attr->ia_uid = obj->st_uid; valid |= ATTR_UID;
+ attr->ia_gid = obj->st_gid; valid |= ATTR_GID;
+
+#if defined(CONFIG_KERNEL_2_5)
+ attr->ia_atime.tv_sec = obj->st_atime; valid |= ATTR_ATIME;
+ attr->ia_ctime.tv_sec = obj->st_ctime; valid |= ATTR_CTIME;
+ attr->ia_mtime.tv_sec = obj->st_mtime; valid |= ATTR_MTIME;
+#else
+ attr->ia_atime = obj->st_atime; valid |= ATTR_ATIME;
+ attr->ia_ctime = obj->st_ctime; valid |= ATTR_CTIME;
+ attr->ia_mtime = obj->st_mtime; valid |= ATTR_MTIME;
+#endif
+ attr->ia_size = yaffs_GetFileSize(obj); valid |= ATTR_SIZE;
+
+ attr->ia_valid = valid;
+
+ return YAFFS_OK;
+
+}
+
+#endif
+
+int yaffs_DumpObject(yaffs_Object *obj)
+{
+// __u8 buffer[YAFFS_BYTES_PER_CHUNK];
+ YCHAR name[257];
+// yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
+
+// memset(buffer,0,YAFFS_BYTES_PER_CHUNK);
+
+// if(obj->chunkId >= 0)
+// {
+// yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL);
+// }
+
+ 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)));
+
+#if 0
+ YPRINTF(("Object %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d\n",
+ obj->objectId, oh->name, obj->dirty, obj->valid, obj->serial,
+ obj->sum, obj->chunkId));
+ switch(obj->variantType)
+ {
+ case YAFFS_OBJECT_TYPE_FILE:
+ YPRINTF((" FILE length %d\n",obj->variant.fileVariant.fileSize));
+ break;
+ case YAFFS_OBJECT_TYPE_DIRECTORY:
+ YPRINTF((" DIRECTORY\n"));
+ break;
+ case YAFFS_OBJECT_TYPE_HARDLINK: //todo
+ case YAFFS_OBJECT_TYPE_SYMLINK:
+ case YAFFS_OBJECT_TYPE_UNKNOWN:
+ default:
+ }
+#endif
+
+ return YAFFS_OK;
+}
+
+
+///////////////////////// Initialisation code ///////////////////////////
+
+
+int yaffs_CheckDevFunctions(const yaffs_Device *dev)
+{
+
+ // Common functions, gotta have
+ if(!dev->eraseBlockInNAND ||
+ !dev->initialiseNAND) return 0;
+
+ // 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;
+
+ // 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
+}
+
+
+int yaffs_GutsInitialise(yaffs_Device *dev)
+{
+ unsigned x;
+ int bits;
+ int extraBits;
+ int nBlocks;
+
+ // Check stuff that must be set
+
+ if(!dev)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Need a device\n" TENDSTR)));
+ return YAFFS_FAIL;
+ }
+
+ // Check geometry parameters.
+
+ if( (dev->isYaffs2 && dev->nBytesPerChunk <1024) ||
+ (!dev->isYaffs2 && dev->nBytesPerChunk !=512) ||
+ dev->nChunksPerBlock < 2 ||
+ dev->nReservedBlocks < 2 ||
+ dev->startBlock <= 0 ||
+ dev->endBlock <= 0 ||
+ dev->endBlock <= (dev->startBlock + dev->nReservedBlocks + 2) // otherwise it is too small
+ )
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: nand geometry problems\n" 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;
+
+
+ nBlocks = dev->endBlock - dev->startBlock + 1;
+
+
+
+ // OK now calculate a few things for the device
+ // Calculate chunkGroupBits.
+ // We need to find the next power of 2 > than endBlock
+
+ x = dev->nChunksPerBlock * (dev->endBlock+1);
+
+ for(bits = extraBits = 0; x > 1; bits++)
+ {
+ if(x & 1) extraBits++;
+ x >>= 1;
+ }
+
+ if(extraBits > 0) bits++;
+
+
+ // Level0 Tnodes are 16 bits, 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 <= 16)
+ {
+ dev->chunkGroupBits = 0;
+ }
+ else
+ {
+ dev->chunkGroupBits = bits - 16;
+ }
+
+ 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->localBuffer = YMALLOC(dev->nBytesPerChunk);
+ // Initialise temporary buffers
+ {
+ int i;
+ for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+ {
+ dev->tempBuffer[i].line = 0; // not in use
+ dev->tempBuffer[i].buffer = YMALLOC(dev->nBytesPerChunk);
+ }
+ }
+
+
+
+
+ yaffs_InitialiseBlocks(dev,nBlocks);
+
+ yaffs_InitialiseTnodes(dev);
+
+ yaffs_InitialiseObjects(dev);
+
+ dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
+
+ if(dev->nShortOpCaches > 0)
+ {
+ int i;
+
+ if(dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
+ {
+ dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
+ }
+
+ dev->srCache = YMALLOC( dev->nShortOpCaches * sizeof(yaffs_ChunkCache));
+
+ for(i=0; i < dev->nShortOpCaches; i++)
+ {
+ dev->srCache[i].object = NULL;
+ dev->srCache[i].lastUse = 0;
+ dev->srCache[i].dirty = 0;
+ dev->srCache[i].data = YMALLOC(dev->nBytesPerChunk);
+ }
+ dev->srLastUse = 0;
+ }
+
+ dev->cacheHits = 0;
+
+
+ // Initialise the unlinked, root and lost and found directories
+ dev->lostNFoundDir = dev->rootDir = dev->unlinkedDir = dev->deletedDir = NULL;
+
+ dev->unlinkedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_UNLINKED, S_IFDIR);
+ dev->deletedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_UNLINKED, S_IFDIR);
+
+ dev->rootDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_ROOT,YAFFS_ROOT_MODE | S_IFDIR);
+ dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_LOSTNFOUND,YAFFS_LOSTNFOUND_MODE | S_IFDIR);
+ yaffs_AddObjectToDirectory(dev->rootDir,dev->lostNFoundDir);
+
+ if(dev->isYaffs2)
+ {
+ dev->useHeaderFileSize = 1;
+ }
+
+ // Now scan the flash.
+ yaffs_Scan(dev);
+
+ // Zero out stats
+ dev->nPageReads = 0;
+ dev->nPageWrites = 0;
+ dev->nBlockErasures = 0;
+ dev->nGCCopies = 0;
+ dev->nRetriedWrites = 0;
+
+ dev->nRetiredBlocks = 0;
+
+
+ return YAFFS_OK;
+
+}
+
+void yaffs_Deinitialise(yaffs_Device *dev)
+{
+ if(dev->isMounted)
+ {
+ int i;
+
+ yaffs_DeinitialiseBlocks(dev);
+ yaffs_DeinitialiseTnodes(dev);
+ yaffs_DeinitialiseObjects(dev);
+ if(dev->nShortOpCaches > 0)
+ {
+
+ for(i=0; i < dev->nShortOpCaches; i++)
+ {
+ YFREE(dev->srCache[i].data);
+ }
+
+ YFREE(dev->srCache);
+ }
+
+ YFREE(dev->gcCleanupList);
+
+ for(i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
+ {
+ YFREE(dev->tempBuffer[i].buffer);
+ }
+
+ dev->isMounted = 0;
+ }
+
+}
+
+#if 0
+
+int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
+{
+ int nFree = dev->nFreeChunks - (dev->nChunksPerBlock * YAFFS_RESERVED_BLOCKS);
+
+ struct list_head *i;
+ yaffs_Object *l;
+
+
+ // To the free chunks add the chunks that are in the deleted unlinked files.
+ list_for_each(i,&dev->deletedDir->variant.directoryVariant.children)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+ if(l->deleted)
+ {
+ nFree++;
+ nFree += l->nDataChunks;
+ }
+ }
+
+
+ // printf("___________ nFreeChunks is %d nFree is %d\n",dev->nFreeChunks,nFree);
+
+ if(nFree < 0) nFree = 0;
+
+ return nFree;
+
+}
+
+#endif
+
+int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
+{
+ int nFree;
+ int pending;
+ int b;
+ int nDirtyCacheChunks=0;
+
+ yaffs_BlockInfo *blk;
+
+ struct list_head *i;
+ yaffs_Object *l;
+
+ for(nFree = 0, b = dev->startBlock; b <= dev->endBlock; b++)
+ {
+ blk = yaffs_GetBlockInfo(dev,b);
+
+ switch(blk->blockState)
+ {
+ case YAFFS_BLOCK_STATE_EMPTY:
+ case YAFFS_BLOCK_STATE_ALLOCATING:
+ case YAFFS_BLOCK_STATE_FULL: nFree += (dev->nChunksPerBlock - blk->pagesInUse); break;
+ default: break;
+ }
+ }
+
+
+ pending = 0;
+
+ // To the free chunks add the chunks that are in the deleted unlinked files.
+ list_for_each(i,&dev->deletedDir->variant.directoryVariant.children)
+ {
+ if(i)
+ {
+ l = list_entry(i, yaffs_Object,siblings);
+ if(l->deleted)
+ {
+ pending++;
+ pending += l->nDataChunks;
+ }
+ }
+ }
+
+
+
+ //printf("___________ really free is %d, pending %d, nFree is %d\n",nFree,pending, nFree+pending);
+
+ if(nFree != dev->nFreeChunks)
+ {
+ // printf("___________Different! really free is %d, nFreeChunks %d\n",nFree dev->nFreeChunks);
+ }
+
+ nFree += pending;
+
+ // Now count the number of dirty chunks in the cache and subtract those
+
+ {
+ int i;
+ for(i = 0; i < dev->nShortOpCaches; i++)
+ {
+ if(dev->srCache[i].dirty) nDirtyCacheChunks++;
+ }
+ }
+
+ nFree -= nDirtyCacheChunks;
+
+ nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
+
+ if(nFree < 0) nFree = 0;
+
+ return nFree;
+
+}
+
+
+
+/////////////////// 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;
+}
+
+#if 0
+void yaffs_GutsTest(yaffs_Device *dev)
+{
+
+ if(yaffs_CheckStructures() != YAFFS_OK)
+ {
+ T(YAFFS_TRACE_ALWAYS,(TSTR("One or more structures malformed-- aborting\n" TENDSTR)));
+ return;
+ }
+
+ yaffs_TnodeTest(dev);
+ yaffs_ObjectTest(dev);
+}
+#endif
+
+
+
projects / yaffs2.git / commitdiff