-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2007 Aleph One Ltd.
- * for Toby Churchill Ltd and Brightstar Engineering
- *
- * Created by Charles Manning <charles@aleph1.co.uk>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-const char *yaffs_guts_c_version =
- "$Id: yaffs_guts.c,v 1.49 2007-05-15 20:07:40 charles Exp $";
-
-#include "yportenv.h"
-
-#include "yaffsinterface.h"
-#include "yaffs_guts.h"
-#include "yaffs_tagsvalidity.h"
-
-#include "yaffs_tagscompat.h"
-#ifndef CONFIG_YAFFS_USE_OWN_SORT
-#include "yaffs_qsort.h"
-#endif
-#include "yaffs_nand.h"
-
-#include "yaffs_checkptrw.h"
-
-#include "yaffs_nand.h"
-#include "yaffs_packedtags2.h"
-
-
-#ifdef CONFIG_YAFFS_WINCE
-void yfsd_LockYAFFS(BOOL fsLockOnly);
-void yfsd_UnlockYAFFS(BOOL fsLockOnly);
-#endif
-
-#define YAFFS_PASSIVE_GC_CHUNKS 2
-
-#include "yaffs_ecc.h"
-
-
-/* Robustification (if it ever comes about...) */
-static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND);
-static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk);
-static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
- const __u8 * data,
- const yaffs_ExtendedTags * tags);
-static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
- const yaffs_ExtendedTags * tags);
-
-/* Other local prototypes */
-static int yaffs_UnlinkObject( yaffs_Object *obj);
-static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
-
-static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
-
-static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device * dev,
- const __u8 * buffer,
- yaffs_ExtendedTags * tags,
- int useReserve);
-static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
- int chunkInNAND, int inScan);
-
-static yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
- yaffs_ObjectType type);
-static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
- yaffs_Object * obj);
-static int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name,
- int force, int isShrink, int shadows);
-static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj);
-static int yaffs_CheckStructures(void);
-static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
- int chunkOffset, int *limit);
-static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
-
-static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
-
-static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo);
-static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
- int lineNo);
-
-static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
- int chunkInNAND);
-
-static int yaffs_UnlinkWorker(yaffs_Object * obj);
-static void yaffs_DestroyObject(yaffs_Object * obj);
-
-static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
- int chunkInObject);
-
-loff_t yaffs_GetFileSize(yaffs_Object * obj);
-
-static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr);
-
-static void yaffs_VerifyFreeChunks(yaffs_Device * dev);
-
-static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
-
-#ifdef YAFFS_PARANOID
-static int yaffs_CheckFileSanity(yaffs_Object * in);
-#else
-#define yaffs_CheckFileSanity(in)
-#endif
-
-static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in);
-static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId);
-
-static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
-
-static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
- yaffs_ExtendedTags * tags);
-
-static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos);
-static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
- yaffs_FileStructure * fStruct,
- __u32 chunkId);
-
-
-/* Function to calculate chunk and offset */
-
-static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, __u32 *chunk, __u32 *offset)
-{
- if(dev->chunkShift){
- /* Easy-peasy power of 2 case */
- *chunk = (__u32)(addr >> dev->chunkShift);
- *offset = (__u32)(addr & dev->chunkMask);
- }
- else if(dev->crumbsPerChunk)
- {
- /* Case where we're using "crumbs" */
- *offset = (__u32)(addr & dev->crumbMask);
- addr >>= dev->crumbShift;
- *chunk = ((__u32)addr)/dev->crumbsPerChunk;
- *offset += ((addr - (*chunk * dev->crumbsPerChunk)) << dev->crumbShift);
- }
- else
- YBUG();
-}
-
-/* Function to return the number of shifts for a power of 2 greater than or equal
- * to the given number
- * Note we don't try to cater for all possible numbers and this does not have to
- * be hellishly efficient.
- */
-
-static __u32 ShiftsGE(__u32 x)
-{
- int extraBits;
- int nShifts;
-
- nShifts = extraBits = 0;
-
- while(x>1){
- if(x & 1) extraBits++;
- x>>=1;
- nShifts++;
- }
-
- if(extraBits)
- nShifts++;
-
- return nShifts;
-}
-
-/* Function to return the number of shifts to get a 1 in bit 0
- */
-
-static __u32 ShiftDiv(__u32 x)
-{
- int nShifts;
-
- nShifts = 0;
-
- if(!x) return 0;
-
- while( !(x&1)){
- x>>=1;
- nShifts++;
- }
-
- return nShifts;
-}
-
-
-
-/*
- * Temporary buffer manipulations.
- */
-
-static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
-{
- int i;
- __u8 *buf = (__u8 *)1;
-
- memset(dev->tempBuffer,0,sizeof(dev->tempBuffer));
-
- for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
- dev->tempBuffer[i].line = 0; /* not in use */
- dev->tempBuffer[i].buffer = buf =
- YMALLOC_DMA(dev->nDataBytesPerChunk);
- }
-
- return buf ? YAFFS_OK : YAFFS_FAIL;
-
-}
-
-static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
-{
- int i, j;
- for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
- if (dev->tempBuffer[i].line == 0) {
- dev->tempBuffer[i].line = lineNo;
- if ((i + 1) > dev->maxTemp) {
- dev->maxTemp = i + 1;
- for (j = 0; j <= i; j++)
- dev->tempBuffer[j].maxLine =
- dev->tempBuffer[j].line;
- }
-
- return dev->tempBuffer[i].buffer;
- }
- }
-
- T(YAFFS_TRACE_BUFFERS,
- (TSTR("Out of temp buffers at line %d, other held by lines:"),
- lineNo));
- for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
- T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
- }
- T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
-
- /*
- * If we got here then we have to allocate an unmanaged one
- * This is not good.
- */
-
- dev->unmanagedTempAllocations++;
- return YMALLOC(dev->nDataBytesPerChunk);
-
-}
-
-static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
- int lineNo)
-{
- int i;
- for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
- if (dev->tempBuffer[i].buffer == buffer) {
- dev->tempBuffer[i].line = 0;
- return;
- }
- }
-
- if (buffer) {
- /* assume it is an unmanaged one. */
- T(YAFFS_TRACE_BUFFERS,
- (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
- lineNo));
- YFREE(buffer);
- dev->unmanagedTempDeallocations++;
- }
-
-}
-
-/*
- * Determine if we have a managed buffer.
- */
-int yaffs_IsManagedTempBuffer(yaffs_Device * dev, const __u8 * buffer)
-{
- int i;
- for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
- if (dev->tempBuffer[i].buffer == buffer)
- return 1;
-
- }
-
- for (i = 0; i < dev->nShortOpCaches; i++) {
- if( dev->srCache[i].data == buffer )
- return 1;
-
- }
-
- if (buffer == dev->checkpointBuffer)
- return 1;
-
- T(YAFFS_TRACE_ALWAYS,
- (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
- return 0;
-}
-
-
-
-/*
- * Chunk bitmap manipulations
- */
-
-static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
-{
- if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
- T(YAFFS_TRACE_ERROR,
- (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
- blk));
- YBUG();
- }
- return dev->chunkBits +
- (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
-}
-
-static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
-{
- if(blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
- chunk < 0 || chunk >= dev->nChunksPerBlock) {
- T(YAFFS_TRACE_ERROR,
- (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),blk,chunk));
- YBUG();
- }
-}
-
-static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
-{
- __u8 *blkBits = yaffs_BlockBits(dev, blk);
-
- memset(blkBits, 0, dev->chunkBitmapStride);
-}
-
-static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
-{
- __u8 *blkBits = yaffs_BlockBits(dev, blk);
-
- yaffs_VerifyChunkBitId(dev,blk,chunk);
-
- blkBits[chunk / 8] &= ~(1 << (chunk & 7));
-}
-
-static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
-{
- __u8 *blkBits = yaffs_BlockBits(dev, blk);
-
- yaffs_VerifyChunkBitId(dev,blk,chunk);
-
- blkBits[chunk / 8] |= (1 << (chunk & 7));
-}
-
-static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
-{
- __u8 *blkBits = yaffs_BlockBits(dev, blk);
- yaffs_VerifyChunkBitId(dev,blk,chunk);
-
- return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
-}
-
-static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
-{
- __u8 *blkBits = yaffs_BlockBits(dev, blk);
- int i;
- for (i = 0; i < dev->chunkBitmapStride; i++) {
- if (*blkBits)
- return 1;
- blkBits++;
- }
- return 0;
-}
-
-static int yaffs_CountChunkBits(yaffs_Device * dev, int blk)
-{
- __u8 *blkBits = yaffs_BlockBits(dev, blk);
- int i;
- int n = 0;
- for (i = 0; i < dev->chunkBitmapStride; i++) {
- __u8 x = *blkBits;
- while(x){
- if(x & 1)
- n++;
- x >>=1;
- }
-
- blkBits++;
- }
- return n;
-}
-
-/*
- * Verification code
- */
-
-static int yaffs_SkipVerification(yaffs_Device *dev)
-{
- return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
-}
-
-static int yaffs_SkipFullVerification(yaffs_Device *dev)
-{
- return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
-}
-
-static int yaffs_SkipNANDVerification(yaffs_Device *dev)
-{
- return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
-}
-
-static const char * blockStateName[] = {
-"Unknown",
-"Needs scanning",
-"Scanning",
-"Empty",
-"Allocating",
-"Full",
-"Dirty",
-"Checkpoint",
-"Collecting",
-"Dead"
-};
-
-static void yaffs_VerifyBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
-{
- int actuallyUsed;
- int inUse;
-
- if(yaffs_SkipVerification(dev))
- return;
-
- /* Report illegal runtime states */
- if(bi->blockState <0 || bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
- T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has undefined state %d"TENDSTR),n,bi->blockState));
-
- switch(bi->blockState){
- case YAFFS_BLOCK_STATE_UNKNOWN:
- case YAFFS_BLOCK_STATE_SCANNING:
- case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
- T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has bad run-state %s"TENDSTR),
- n,blockStateName[bi->blockState]));
- }
-
- /* Check pages in use and soft deletions are legal */
-
- actuallyUsed = bi->pagesInUse - bi->softDeletions;
-
- if(bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
- bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
- actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
- T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
- n,bi->pagesInUse,bi->softDeletions));
-
-
- /* Check chunk bitmap legal */
- inUse = yaffs_CountChunkBits(dev,n);
- if(inUse != bi->pagesInUse)
- T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
- n,bi->pagesInUse,inUse));
-
- /* Check that the sequence number is valid.
- * Ten million is legal, but is very unlikely
- */
- if(dev->isYaffs2 &&
- (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
- (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000 ))
- T(YAFFS_TRACE_VERIFY,(TSTR("Block %d has suspect sequence number of %d"TENDSTR),
- n,bi->sequenceNumber));
-
-}
-
-static void yaffs_VerifyCollectedBlock(yaffs_Device *dev,yaffs_BlockInfo *bi,int n)
-{
- yaffs_VerifyBlock(dev,bi,n);
-
- /* After collection the block should be in the erased state */
- /* TODO: This will need to change if we do partial gc */
-
- if(bi->blockState != YAFFS_BLOCK_STATE_EMPTY){
- T(YAFFS_TRACE_ERROR,(TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
- n,bi->blockState));
- }
-}
-
-static void yaffs_VerifyBlocks(yaffs_Device *dev)
-{
- int i;
- int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
- int nIllegalBlockStates = 0;
-
-
- if(yaffs_SkipVerification(dev))
- return;
-
- memset(nBlocksPerState,0,sizeof(nBlocksPerState));
-
-
- for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++){
- yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,i);
- yaffs_VerifyBlock(dev,bi,i);
-
- if(bi->blockState >=0 && bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
- nBlocksPerState[bi->blockState]++;
- else
- nIllegalBlockStates++;
-
- }
-
- T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
- T(YAFFS_TRACE_VERIFY,(TSTR("Block summary"TENDSTR)));
-
- T(YAFFS_TRACE_VERIFY,(TSTR("%d blocks have illegal states"TENDSTR),nIllegalBlockStates));
- if(nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
- T(YAFFS_TRACE_VERIFY,(TSTR("Too many allocating blocks"TENDSTR)));
-
- for(i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
- T(YAFFS_TRACE_VERIFY,
- (TSTR("%s %d blocks"TENDSTR),
- blockStateName[i],nBlocksPerState[i]));
-
- if(dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
- dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
-
- if(dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
- dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
-
- if(nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
- nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
-
- T(YAFFS_TRACE_VERIFY,(TSTR(""TENDSTR)));
-
-}
-
-/*
- * Verify the object header. oh must be valid, but obj and tags may be NULL in which
- * case those tests will not be performed.
- */
-static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
-{
- if(yaffs_SkipVerification(obj->myDev))
- return;
-
- if(!(tags && obj && oh)){
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
- (__u32)tags,(__u32)obj,(__u32)oh));
- return;
- }
-
- if(oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
- oh->type > YAFFS_OBJECT_TYPE_MAX)
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
- tags->objectId, oh->type));
-
- if(tags->objectId != obj->objectId)
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
- tags->objectId, obj->objectId));
-
-
- /*
- * Check that the object's parent ids match if parentCheck requested.
- *
- * Tests do not apply to the root object.
- */
-
- if(parentCheck && tags->objectId > 1 && !obj->parent)
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
- tags->objectId, oh->parentObjectId));
-
-
- if(parentCheck && obj->parent &&
- oh->parentObjectId != obj->parent->objectId &&
- (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
- obj->parent->objectId != YAFFS_OBJECTID_DELETED))
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
- tags->objectId, oh->parentObjectId, obj->parent->objectId));
-
-
- if(tags->objectId > 1 && oh->name[0] == 0) /* Null name */
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Obj %d header name is NULL"TENDSTR),
- obj->objectId));
-
- if(tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Obj %d header name is 0xFF"TENDSTR),
- obj->objectId));
-}
-
-
-
-static int yaffs_VerifyTnodeWorker(yaffs_Object * obj, yaffs_Tnode * tn,
- __u32 level, int chunkOffset)
-{
- int i;
- yaffs_Device *dev = obj->myDev;
- int ok = 1;
- int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
-
- if (tn) {
- if (level > 0) {
-
- for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
- if (tn->internal[i]) {
- ok = yaffs_VerifyTnodeWorker(obj,
- tn->internal[i],
- level - 1,
- (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
- }
- }
- } else if (level == 0) {
- int i;
- yaffs_ExtendedTags tags;
- __u32 objectId = obj->objectId;
-
- chunkOffset <<= YAFFS_TNODES_LEVEL0_BITS;
-
- for(i = 0; i < YAFFS_NTNODES_LEVEL0; i++){
- __u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
-
- if(theChunk > 0){
- /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
- yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
- if(tags.objectId != objectId || tags.chunkId != chunkOffset){
- T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
- objectId, chunkOffset, theChunk,
- tags.objectId, tags.chunkId));
- }
- }
- chunkOffset++;
- }
- }
- }
-
- return ok;
-
-}
-
-
-static void yaffs_VerifyFile(yaffs_Object *obj)
-{
- int requiredTallness;
- int actualTallness;
- __u32 lastChunk;
- __u32 x;
- __u32 i;
- int ok;
- yaffs_Device *dev;
- yaffs_ExtendedTags tags;
- yaffs_Tnode *tn;
- __u32 objectId;
-
- if(obj && yaffs_SkipVerification(obj->myDev))
- return;
-
- dev = obj->myDev;
- objectId = obj->objectId;
-
- /* Check file size is consistent with tnode depth */
- lastChunk = obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
- x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
- requiredTallness = 0;
- while (x> 0) {
- x >>= YAFFS_TNODES_INTERNAL_BITS;
- requiredTallness++;
- }
-
- actualTallness = obj->variant.fileVariant.topLevel;
-
- if(requiredTallness > actualTallness )
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
- obj->objectId,actualTallness, requiredTallness));
-
-
- /* Check that the chunks in the tnode tree are all correct.
- * We do this by scanning through the tnode tree and
- * checking the tags for every chunk match.
- */
-
- if(yaffs_SkipNANDVerification(dev))
- return;
-
- for(i = 1; i <= lastChunk; i++){
- tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant,i);
-
- if (tn) {
- __u32 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
- if(theChunk > 0){
- /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
- yaffs_ReadChunkWithTagsFromNAND(dev,theChunk,NULL, &tags);
- if(tags.objectId != objectId || tags.chunkId != i){
- T(~0,(TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
- objectId, i, theChunk,
- tags.objectId, tags.chunkId));
- }
- }
- }
-
- }
-
-}
-
-static void yaffs_VerifyDirectory(yaffs_Object *obj)
-{
- if(obj && yaffs_SkipVerification(obj->myDev))
- return;
-
-}
-
-static void yaffs_VerifyHardLink(yaffs_Object *obj)
-{
- if(obj && yaffs_SkipVerification(obj->myDev))
- return;
-
- /* Verify sane equivalent object */
-}
-
-static void yaffs_VerifySymlink(yaffs_Object *obj)
-{
- if(obj && yaffs_SkipVerification(obj->myDev))
- return;
-
- /* Verify symlink string */
-}
-
-static void yaffs_VerifySpecial(yaffs_Object *obj)
-{
- if(obj && yaffs_SkipVerification(obj->myDev))
- return;
-}
-
-static void yaffs_VerifyObject(yaffs_Object *obj)
-{
- yaffs_Device *dev;
-
- __u32 chunkMin;
- __u32 chunkMax;
-
- __u32 chunkIdOk;
- __u32 chunkIsLive;
-
- if(!obj)
- return;
-
- dev = obj->myDev;
-
- if(yaffs_SkipVerification(dev))
- return;
-
- /* Check sane object header chunk */
-
- chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
- chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
-
- chunkIdOk = (obj->chunkId >= chunkMin && obj->chunkId <= chunkMax);
- chunkIsLive = chunkIdOk &&
- yaffs_CheckChunkBit(dev,
- obj->chunkId / dev->nChunksPerBlock,
- obj->chunkId % dev->nChunksPerBlock);
- if(!obj->fake &&
- (!chunkIdOk || !chunkIsLive)) {
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
- obj->objectId,obj->chunkId,
- chunkIdOk ? "" : ",out of range",
- chunkIsLive || !chunkIdOk ? "" : ",marked as deleted"));
- }
-
- if(chunkIdOk && chunkIsLive &&!yaffs_SkipNANDVerification(dev)) {
- yaffs_ExtendedTags tags;
- yaffs_ObjectHeader *oh;
- __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
-
- oh = (yaffs_ObjectHeader *)buffer;
-
- yaffs_ReadChunkWithTagsFromNAND(dev, obj->chunkId,buffer, &tags);
-
- yaffs_VerifyObjectHeader(obj,oh,&tags,1);
-
- yaffs_ReleaseTempBuffer(dev,buffer,__LINE__);
- }
-
- /* Verify it has a parent */
- if(obj && !obj->fake &&
- (!obj->parent || obj->parent->myDev != dev)){
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
- obj->objectId,obj->parent));
- }
-
- /* Verify parent is a directory */
- if(obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY){
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
- obj->objectId,obj->parent->variantType));
- }
-
- switch(obj->variantType){
- case YAFFS_OBJECT_TYPE_FILE:
- yaffs_VerifyFile(obj);
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- yaffs_VerifySymlink(obj);
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- yaffs_VerifyDirectory(obj);
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- yaffs_VerifyHardLink(obj);
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- yaffs_VerifySpecial(obj);
- break;
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- default:
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Obj %d has illegaltype %d"TENDSTR),
- obj->objectId,obj->variantType));
- break;
- }
-
-
-}
-
-static void yaffs_VerifyObjects(yaffs_Device *dev)
-{
- yaffs_Object *obj;
- int i;
- struct list_head *lh;
-
- if(yaffs_SkipVerification(dev))
- return;
-
- /* Iterate through the objects in each hash entry */
-
- for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++){
- list_for_each(lh, &dev->objectBucket[i].list) {
- if (lh) {
- obj = list_entry(lh, yaffs_Object, hashLink);
- yaffs_VerifyObject(obj);
- }
- }
- }
-
-}
-
-
-/*
- * Simple hash function. Needs to have a reasonable spread
- */
-
-static Y_INLINE int yaffs_HashFunction(int n)
-{
- n = abs(n);
- return (n % YAFFS_NOBJECT_BUCKETS);
-}
-
-/*
- * Access functions to useful fake objects
- */
-
-yaffs_Object *yaffs_Root(yaffs_Device * dev)
-{
- return dev->rootDir;
-}
-
-yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
-{
- return dev->lostNFoundDir;
-}
-
-
-/*
- * Erased NAND checking functions
- */
-
-int yaffs_CheckFF(__u8 * buffer, int nBytes)
-{
- /* Horrible, slow implementation */
- while (nBytes--) {
- if (*buffer != 0xFF)
- return 0;
- buffer++;
- }
- return 1;
-}
-
-static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
- int chunkInNAND)
-{
-
- int retval = YAFFS_OK;
- __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
- yaffs_ExtendedTags tags;
- int result;
-
- result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
-
- if(tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
- retval = YAFFS_FAIL;
-
-
- if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
- T(YAFFS_TRACE_NANDACCESS,
- (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
- retval = YAFFS_FAIL;
- }
-
- yaffs_ReleaseTempBuffer(dev, data, __LINE__);
-
- return retval;
-
-}
-
-
-static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
- const __u8 * data,
- yaffs_ExtendedTags * tags,
- int useReserve)
-{
- int attempts = 0;
- int writeOk = 0;
- int chunk;
-
- yaffs_InvalidateCheckpoint(dev);
-
- do {
- yaffs_BlockInfo *bi = 0;
- int erasedOk = 0;
-
- chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
- if (chunk < 0) {
- /* no space */
- break;
- }
-
- /* First check this chunk is erased, if it needs
- * checking. The checking policy (unless forced
- * always on) is as follows:
- *
- * Check the first page we try to write in a block.
- * If the check passes then we don't need to check any
- * more. If the check fails, we check again...
- * If the block has been erased, we don't need to check.
- *
- * However, if the block has been prioritised for gc,
- * then we think there might be something odd about
- * this block and stop using it.
- *
- * Rationale: We should only ever see chunks that have
- * not been erased if there was a partially written
- * chunk due to power loss. This checking policy should
- * catch that case with very few checks and thus save a
- * lot of checks that are most likely not needed.
- */
- if (bi->gcPrioritise) {
- yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
- /* try another chunk */
- continue;
- }
-
- /* let's give it a try */
- attempts++;
-
-#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
- bi->skipErasedCheck = 0;
-#endif
- if (!bi->skipErasedCheck) {
- erasedOk = yaffs_CheckChunkErased(dev, chunk);
- if (erasedOk != YAFFS_OK) {
- T(YAFFS_TRACE_ERROR,
- (TSTR ("**>> yaffs chunk %d was not erased"
- TENDSTR), chunk));
-
- /* try another chunk */
- continue;
- }
- bi->skipErasedCheck = 1;
- }
-
- writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
- data, tags);
- if (writeOk != YAFFS_OK) {
- yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
- /* try another chunk */
- continue;
- }
-
- /* Copy the data into the robustification buffer */
- yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
-
- } while (writeOk != YAFFS_OK && attempts < yaffs_wr_attempts);
-
- if (attempts > 1) {
- T(YAFFS_TRACE_ERROR,
- (TSTR("**>> yaffs write required %d attempts" TENDSTR),
- attempts));
-
- dev->nRetriedWrites += (attempts - 1);
- }
-
- return chunk;
-}
-
-/*
- * Block retiring for handling a broken block.
- */
-
-static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
-{
- yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
-
- yaffs_InvalidateCheckpoint(dev);
-
- yaffs_MarkBlockBad(dev, blockInNAND);
-
- bi->blockState = YAFFS_BLOCK_STATE_DEAD;
- bi->gcPrioritise = 0;
- bi->needsRetiring = 0;
-
- dev->nRetiredBlocks++;
-}
-
-/*
- * Functions for robustisizing TODO
- *
- */
-
-static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
- const __u8 * data,
- const yaffs_ExtendedTags * tags)
-{
-}
-
-static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
- const yaffs_ExtendedTags * tags)
-{
-}
-
-void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
-{
- if(!bi->gcPrioritise){
- bi->gcPrioritise = 1;
- dev->hasPendingPrioritisedGCs = 1;
- bi->chunkErrorStrikes ++;
-
- if(bi->chunkErrorStrikes > 3){
- bi->needsRetiring = 1; /* Too many stikes, so retire this */
- T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
-
- }
-
- }
-}
-
-static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND, int erasedOk)
-{
-
- int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
- yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
-
- yaffs_HandleChunkError(dev,bi);
-
-
- if(erasedOk ) {
- /* Was an actual write failure, so mark the block for retirement */
- bi->needsRetiring = 1;
- T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
- (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
-
-
- }
-
- /* Delete the chunk */
- yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
-}
-
-
-/*---------------- Name handling functions ------------*/
-
-static __u16 yaffs_CalcNameSum(const YCHAR * name)
-{
- __u16 sum = 0;
- __u16 i = 1;
-
- YUCHAR *bname = (YUCHAR *) name;
- if (bname) {
- while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
-
-#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
- sum += yaffs_toupper(*bname) * i;
-#else
- sum += (*bname) * i;
-#endif
- i++;
- bname++;
- }
- }
- return sum;
-}
-
-static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
-{
-#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
- if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
- yaffs_strcpy(obj->shortName, name);
- } else {
- obj->shortName[0] = _Y('\0');
- }
-#endif
- obj->sum = yaffs_CalcNameSum(name);
-}
-
-/*-------------------- TNODES -------------------
-
- * List of spare tnodes
- * The list is hooked together using the first pointer
- * in the tnode.
- */
-
-/* yaffs_CreateTnodes creates a bunch more tnodes and
- * adds them to the tnode free list.
- * Don't use this function directly
- */
-
-static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
-{
- int i;
- int tnodeSize;
- yaffs_Tnode *newTnodes;
- __u8 *mem;
- yaffs_Tnode *curr;
- yaffs_Tnode *next;
- yaffs_TnodeList *tnl;
-
- if (nTnodes < 1)
- return YAFFS_OK;
-
- /* Calculate the tnode size in bytes for variable width tnode support.
- * Must be a multiple of 32-bits */
- tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
-
- /* make these things */
-
- newTnodes = YMALLOC(nTnodes * tnodeSize);
- mem = (__u8 *)newTnodes;
-
- if (!newTnodes) {
- T(YAFFS_TRACE_ERROR,
- (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
- return YAFFS_FAIL;
- }
-
- /* Hook them into the free list */
-#if 0
- for (i = 0; i < nTnodes - 1; i++) {
- newTnodes[i].internal[0] = &newTnodes[i + 1];
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
- newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
-#endif
- }
-
- newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
- newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
-#endif
- dev->freeTnodes = newTnodes;
-#else
- /* New hookup for wide tnodes */
- for(i = 0; i < nTnodes -1; i++) {
- curr = (yaffs_Tnode *) &mem[i * tnodeSize];
- next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
- curr->internal[0] = next;
- }
-
- curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
- curr->internal[0] = dev->freeTnodes;
- dev->freeTnodes = (yaffs_Tnode *)mem;
-
-#endif
-
-
- dev->nFreeTnodes += nTnodes;
- dev->nTnodesCreated += nTnodes;
-
- /* Now add this bunch of tnodes to a list for freeing up.
- * NB If we can't add this to the management list it isn't fatal
- * but it just means we can't free this bunch of tnodes later.
- */
-
- tnl = YMALLOC(sizeof(yaffs_TnodeList));
- if (!tnl) {
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("yaffs: Could not add tnodes to management list" TENDSTR)));
- return YAFFS_FAIL;
-
- } else {
- tnl->tnodes = newTnodes;
- tnl->next = dev->allocatedTnodeList;
- dev->allocatedTnodeList = tnl;
- }
-
- T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
-
- return YAFFS_OK;
-}
-
-/* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
-
-static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
-{
- yaffs_Tnode *tn = NULL;
-
- /* If there are none left make more */
- if (!dev->freeTnodes) {
- yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
- }
-
- if (dev->freeTnodes) {
- tn = dev->freeTnodes;
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
- if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
- /* Hoosterman, this thing looks like it isn't in the list */
- T(YAFFS_TRACE_ALWAYS,
- (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
- }
-#endif
- dev->freeTnodes = dev->freeTnodes->internal[0];
- dev->nFreeTnodes--;
- }
-
- return tn;
-}
-
-static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
-{
- yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
-
- if(tn)
- memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
-
- return tn;
-}
-
-/* FreeTnode frees up a tnode and puts it back on the free list */
-static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
-{
- if (tn) {
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
- if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
- /* Hoosterman, this thing looks like it is already in the list */
- T(YAFFS_TRACE_ALWAYS,
- (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
- }
- tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
-#endif
- tn->internal[0] = dev->freeTnodes;
- dev->freeTnodes = tn;
- dev->nFreeTnodes++;
- }
-}
-
-static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
-{
- /* Free the list of allocated tnodes */
- yaffs_TnodeList *tmp;
-
- while (dev->allocatedTnodeList) {
- tmp = dev->allocatedTnodeList->next;
-
- YFREE(dev->allocatedTnodeList->tnodes);
- YFREE(dev->allocatedTnodeList);
- dev->allocatedTnodeList = tmp;
-
- }
-
- dev->freeTnodes = NULL;
- dev->nFreeTnodes = 0;
-}
-
-static void yaffs_InitialiseTnodes(yaffs_Device * dev)
-{
- dev->allocatedTnodeList = NULL;
- dev->freeTnodes = NULL;
- dev->nFreeTnodes = 0;
- dev->nTnodesCreated = 0;
-
-}
-
-
-void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
-{
- __u32 *map = (__u32 *)tn;
- __u32 bitInMap;
- __u32 bitInWord;
- __u32 wordInMap;
- __u32 mask;
-
- pos &= YAFFS_TNODES_LEVEL0_MASK;
- val >>= dev->chunkGroupBits;
-
- bitInMap = pos * dev->tnodeWidth;
- wordInMap = bitInMap /32;
- bitInWord = bitInMap & (32 -1);
-
- mask = dev->tnodeMask << bitInWord;
-
- map[wordInMap] &= ~mask;
- map[wordInMap] |= (mask & (val << bitInWord));
-
- if(dev->tnodeWidth > (32-bitInWord)) {
- bitInWord = (32 - bitInWord);
- wordInMap++;;
- mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
- map[wordInMap] &= ~mask;
- map[wordInMap] |= (mask & (val >> bitInWord));
- }
-}
-
-static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
-{
- __u32 *map = (__u32 *)tn;
- __u32 bitInMap;
- __u32 bitInWord;
- __u32 wordInMap;
- __u32 val;
-
- pos &= YAFFS_TNODES_LEVEL0_MASK;
-
- bitInMap = pos * dev->tnodeWidth;
- wordInMap = bitInMap /32;
- bitInWord = bitInMap & (32 -1);
-
- val = map[wordInMap] >> bitInWord;
-
- if(dev->tnodeWidth > (32-bitInWord)) {
- bitInWord = (32 - bitInWord);
- wordInMap++;;
- val |= (map[wordInMap] << bitInWord);
- }
-
- val &= dev->tnodeMask;
- val <<= dev->chunkGroupBits;
-
- return val;
-}
-
-/* ------------------- End of individual tnode manipulation -----------------*/
-
-/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
- * The look up tree is represented by the top tnode and the number of topLevel
- * in the tree. 0 means only the level 0 tnode is in the tree.
- */
-
-/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
-static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
- yaffs_FileStructure * fStruct,
- __u32 chunkId)
-{
-
- yaffs_Tnode *tn = fStruct->top;
- __u32 i;
- int requiredTallness;
- int level = fStruct->topLevel;
-
- /* Check sane level and chunk Id */
- if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
- return NULL;
- }
-
- if (chunkId > YAFFS_MAX_CHUNK_ID) {
- return NULL;
- }
-
- /* First check we're tall enough (ie enough topLevel) */
-
- i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
- requiredTallness = 0;
- while (i) {
- i >>= YAFFS_TNODES_INTERNAL_BITS;
- requiredTallness++;
- }
-
- if (requiredTallness > fStruct->topLevel) {
- /* Not tall enough, so we can't find it, return NULL. */
- return NULL;
- }
-
- /* Traverse down to level 0 */
- while (level > 0 && tn) {
- tn = tn->
- internal[(chunkId >>
- ( YAFFS_TNODES_LEVEL0_BITS +
- (level - 1) *
- YAFFS_TNODES_INTERNAL_BITS)
- ) &
- YAFFS_TNODES_INTERNAL_MASK];
- level--;
-
- }
-
- return tn;
-}
-
-/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
- * This happens in two steps:
- * 1. If the tree isn't tall enough, then make it taller.
- * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
- *
- * Used when modifying the tree.
- *
- * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
- * be plugged into the ttree.
- */
-
-static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
- yaffs_FileStructure * fStruct,
- __u32 chunkId,
- yaffs_Tnode *passedTn)
-{
-
- int requiredTallness;
- int i;
- int l;
- yaffs_Tnode *tn;
-
- __u32 x;
-
-
- /* Check sane level and page Id */
- if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
- return NULL;
- }
-
- if (chunkId > YAFFS_MAX_CHUNK_ID) {
- return NULL;
- }
-
- /* First check we're tall enough (ie enough topLevel) */
-
- x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
- requiredTallness = 0;
- while (x) {
- x >>= YAFFS_TNODES_INTERNAL_BITS;
- requiredTallness++;
- }
-
-
- if (requiredTallness > fStruct->topLevel) {
- /* Not tall enough,gotta make the tree taller */
- for (i = fStruct->topLevel; i < requiredTallness; i++) {
-
- tn = yaffs_GetTnode(dev);
-
- if (tn) {
- tn->internal[0] = fStruct->top;
- fStruct->top = tn;
- } else {
- T(YAFFS_TRACE_ERROR,
- (TSTR("yaffs: no more tnodes" TENDSTR)));
- }
- }
-
- fStruct->topLevel = requiredTallness;
- }
-
- /* Traverse down to level 0, adding anything we need */
-
- l = fStruct->topLevel;
- tn = fStruct->top;
-
- if(l > 0) {
- while (l > 0 && tn) {
- x = (chunkId >>
- ( YAFFS_TNODES_LEVEL0_BITS +
- (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
- YAFFS_TNODES_INTERNAL_MASK;
-
-
- if((l>1) && !tn->internal[x]){
- /* Add missing non-level-zero tnode */
- tn->internal[x] = yaffs_GetTnode(dev);
-
- } else if(l == 1) {
- /* Looking from level 1 at level 0 */
- if (passedTn) {
- /* If we already have one, then release it.*/
- if(tn->internal[x])
- yaffs_FreeTnode(dev,tn->internal[x]);
- tn->internal[x] = passedTn;
-
- } else if(!tn->internal[x]) {
- /* Don't have one, none passed in */
- tn->internal[x] = yaffs_GetTnode(dev);
- }
- }
-
- tn = tn->internal[x];
- l--;
- }
- } else {
- /* top is level 0 */
- if(passedTn) {
- memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
- yaffs_FreeTnode(dev,passedTn);
- }
- }
-
- return tn;
-}
-
-static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
- yaffs_ExtendedTags * tags, int objectId,
- int chunkInInode)
-{
- int j;
-
- for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
- if (yaffs_CheckChunkBit
- (dev, theChunk / dev->nChunksPerBlock,
- theChunk % dev->nChunksPerBlock)) {
- yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
- tags);
- if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
- /* found it; */
- return theChunk;
-
- }
- }
- theChunk++;
- }
- return -1;
-}
-
-
-/* DeleteWorker scans backwards through the tnode tree and deletes all the
- * chunks and tnodes in the file
- * Returns 1 if the tree was deleted.
- * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
- */
-
-static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
- int chunkOffset, int *limit)
-{
- int i;
- int chunkInInode;
- int theChunk;
- yaffs_ExtendedTags tags;
- int foundChunk;
- yaffs_Device *dev = in->myDev;
-
- int allDone = 1;
-
- if (tn) {
- if (level > 0) {
-
- for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
- i--) {
- if (tn->internal[i]) {
- if (limit && (*limit) < 0) {
- allDone = 0;
- } else {
- allDone =
- yaffs_DeleteWorker(in,
- tn->
- internal
- [i],
- level -
- 1,
- (chunkOffset
- <<
- YAFFS_TNODES_INTERNAL_BITS)
- + i,
- limit);
- }
- if (allDone) {
- yaffs_FreeTnode(dev,
- tn->
- internal[i]);
- tn->internal[i] = NULL;
- }
- }
-
- }
- return (allDone) ? 1 : 0;
- } else if (level == 0) {
- int hitLimit = 0;
-
- for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
- i--) {
- theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
- if (theChunk) {
-
- chunkInInode =
- (chunkOffset <<
- YAFFS_TNODES_LEVEL0_BITS) + i;
-
- foundChunk =
- yaffs_FindChunkInGroup(dev,
- theChunk,
- &tags,
- in->objectId,
- chunkInInode);
-
- if (foundChunk > 0) {
- yaffs_DeleteChunk(dev,
- foundChunk, 1,
- __LINE__);
- in->nDataChunks--;
- if (limit) {
- *limit = *limit - 1;
- if (*limit <= 0) {
- hitLimit = 1;
- }
- }
-
- }
-
- yaffs_PutLevel0Tnode(dev,tn,i,0);
- }
-
- }
- return (i < 0) ? 1 : 0;
-
- }
-
- }
-
- return 1;
-
-}
-
-static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
-{
-
- yaffs_BlockInfo *theBlock;
-
- T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
-
- theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
- if (theBlock) {
- theBlock->softDeletions++;
- dev->nFreeChunks++;
- }
-}
-
-/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
- * All soft deleting does is increment the block's softdelete count and pulls the chunk out
- * of the tnode.
- * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
- */
-
-static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
- __u32 level, int chunkOffset)
-{
- int i;
- int theChunk;
- int allDone = 1;
- yaffs_Device *dev = in->myDev;
-
- if (tn) {
- if (level > 0) {
-
- for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
- i--) {
- if (tn->internal[i]) {
- allDone =
- yaffs_SoftDeleteWorker(in,
- tn->
- internal[i],
- level - 1,
- (chunkOffset
- <<
- YAFFS_TNODES_INTERNAL_BITS)
- + i);
- if (allDone) {
- yaffs_FreeTnode(dev,
- tn->
- internal[i]);
- tn->internal[i] = NULL;
- } else {
- /* Hoosterman... how could this happen? */
- }
- }
- }
- return (allDone) ? 1 : 0;
- } else if (level == 0) {
-
- for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
- theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
- if (theChunk) {
- /* Note this does not find the real chunk, only the chunk group.
- * We make an assumption that a chunk group is not larger than
- * a block.
- */
- yaffs_SoftDeleteChunk(dev, theChunk);
- yaffs_PutLevel0Tnode(dev,tn,i,0);
- }
-
- }
- return 1;
-
- }
-
- }
-
- return 1;
-
-}
-
-static void yaffs_SoftDeleteFile(yaffs_Object * obj)
-{
- if (obj->deleted &&
- obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
- if (obj->nDataChunks <= 0) {
- /* Empty file with no duplicate object headers, just delete it immediately */
- yaffs_FreeTnode(obj->myDev,
- obj->variant.fileVariant.top);
- obj->variant.fileVariant.top = NULL;
- T(YAFFS_TRACE_TRACING,
- (TSTR("yaffs: Deleting empty file %d" TENDSTR),
- obj->objectId));
- yaffs_DoGenericObjectDeletion(obj);
- } else {
- yaffs_SoftDeleteWorker(obj,
- obj->variant.fileVariant.top,
- obj->variant.fileVariant.
- topLevel, 0);
- obj->softDeleted = 1;
- }
- }
-}
-
-/* Pruning removes any part of the file structure tree that is beyond the
- * bounds of the file (ie that does not point to chunks).
- *
- * A file should only get pruned when its size is reduced.
- *
- * Before pruning, the chunks must be pulled from the tree and the
- * level 0 tnode entries must be zeroed out.
- * Could also use this for file deletion, but that's probably better handled
- * by a special case.
- */
-
-static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
- __u32 level, int del0)
-{
- int i;
- int hasData;
-
- if (tn) {
- hasData = 0;
-
- for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
- if (tn->internal[i] && level > 0) {
- tn->internal[i] =
- yaffs_PruneWorker(dev, tn->internal[i],
- level - 1,
- (i == 0) ? del0 : 1);
- }
-
- if (tn->internal[i]) {
- hasData++;
- }
- }
-
- if (hasData == 0 && del0) {
- /* Free and return NULL */
-
- yaffs_FreeTnode(dev, tn);
- tn = NULL;
- }
-
- }
-
- return tn;
-
-}
-
-static int yaffs_PruneFileStructure(yaffs_Device * dev,
- yaffs_FileStructure * fStruct)
-{
- int i;
- int hasData;
- int done = 0;
- yaffs_Tnode *tn;
-
- if (fStruct->topLevel > 0) {
- fStruct->top =
- yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
-
- /* Now we have a tree with all the non-zero branches NULL but the height
- * is the same as it was.
- * Let's see if we can trim internal tnodes to shorten the tree.
- * We can do this if only the 0th element in the tnode is in use
- * (ie all the non-zero are NULL)
- */
-
- while (fStruct->topLevel && !done) {
- tn = fStruct->top;
-
- hasData = 0;
- for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
- if (tn->internal[i]) {
- hasData++;
- }
- }
-
- if (!hasData) {
- fStruct->top = tn->internal[0];
- fStruct->topLevel--;
- yaffs_FreeTnode(dev, tn);
- } else {
- done = 1;
- }
- }
- }
-
- return YAFFS_OK;
-}
-
-/*-------------------- End of File Structure functions.-------------------*/
-
-/* yaffs_CreateFreeObjects creates a bunch more objects and
- * adds them to the object free list.
- */
-static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
-{
- int i;
- yaffs_Object *newObjects;
- yaffs_ObjectList *list;
-
- if (nObjects < 1)
- return YAFFS_OK;
-
- /* make these things */
- newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
- list = YMALLOC(sizeof(yaffs_ObjectList));
-
- if (!newObjects || !list) {
- if(newObjects)
- YFREE(newObjects);
- if(list)
- YFREE(list);
- T(YAFFS_TRACE_ALLOCATE,
- (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
- return YAFFS_FAIL;
- }
-
- /* Hook them into the free list */
- for (i = 0; i < nObjects - 1; i++) {
- newObjects[i].siblings.next =
- (struct list_head *)(&newObjects[i + 1]);
- }
-
- newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
- dev->freeObjects = newObjects;
- dev->nFreeObjects += nObjects;
- dev->nObjectsCreated += nObjects;
-
- /* Now add this bunch of Objects to a list for freeing up. */
-
- list->objects = newObjects;
- list->next = dev->allocatedObjectList;
- dev->allocatedObjectList = list;
-
- return YAFFS_OK;
-}
-
-
-/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
-static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
-{
- yaffs_Object *tn = NULL;
-
- /* If there are none left make more */
- if (!dev->freeObjects) {
- yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
- }
-
- if (dev->freeObjects) {
- tn = dev->freeObjects;
- dev->freeObjects =
- (yaffs_Object *) (dev->freeObjects->siblings.next);
- dev->nFreeObjects--;
-
- /* Now sweeten it up... */
-
- memset(tn, 0, sizeof(yaffs_Object));
- tn->myDev = dev;
- tn->chunkId = -1;
- tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
- INIT_LIST_HEAD(&(tn->hardLinks));
- INIT_LIST_HEAD(&(tn->hashLink));
- INIT_LIST_HEAD(&tn->siblings);
-
- /* Add it to the lost and found directory.
- * NB Can't put root or lostNFound in lostNFound so
- * check if lostNFound exists first
- */
- if (dev->lostNFoundDir) {
- yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
- }
- }
-
- return tn;
-}
-
-static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
- __u32 mode)
-{
-
- yaffs_Object *obj =
- yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
- if (obj) {
- obj->fake = 1; /* it is fake so it has no NAND presence... */
- obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
- obj->unlinkAllowed = 0; /* ... or unlink it */
- obj->deleted = 0;
- obj->unlinked = 0;
- obj->yst_mode = mode;
- obj->myDev = dev;
- obj->chunkId = 0; /* Not a valid chunk. */
- }
-
- return obj;
-
-}
-
-static void yaffs_UnhashObject(yaffs_Object * tn)
-{
- int bucket;
- yaffs_Device *dev = tn->myDev;
-
- /* If it is still linked into the bucket list, free from the list */
- if (!list_empty(&tn->hashLink)) {
- list_del_init(&tn->hashLink);
- bucket = yaffs_HashFunction(tn->objectId);
- dev->objectBucket[bucket].count--;
- }
-
-}
-
-/* FreeObject frees up a Object and puts it back on the free list */
-static void yaffs_FreeObject(yaffs_Object * tn)
-{
-
- yaffs_Device *dev = tn->myDev;
-
-#ifdef __KERNEL__
- if (tn->myInode) {
- /* We're still hooked up to a cached inode.
- * Don't delete now, but mark for later deletion
- */
- tn->deferedFree = 1;
- return;
- }
-#endif
-
- yaffs_UnhashObject(tn);
-
- /* Link into the free list. */
- tn->siblings.next = (struct list_head *)(dev->freeObjects);
- dev->freeObjects = tn;
- dev->nFreeObjects++;
-}
-
-#ifdef __KERNEL__
-
-void yaffs_HandleDeferedFree(yaffs_Object * obj)
-{
- if (obj->deferedFree) {
- yaffs_FreeObject(obj);
- }
-}
-
-#endif
-
-static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
-{
- /* Free the list of allocated Objects */
-
- yaffs_ObjectList *tmp;
-
- while (dev->allocatedObjectList) {
- tmp = dev->allocatedObjectList->next;
- YFREE(dev->allocatedObjectList->objects);
- YFREE(dev->allocatedObjectList);
-
- dev->allocatedObjectList = tmp;
- }
-
- dev->freeObjects = NULL;
- dev->nFreeObjects = 0;
-}
-
-static void yaffs_InitialiseObjects(yaffs_Device * dev)
-{
- int i;
-
- dev->allocatedObjectList = NULL;
- dev->freeObjects = NULL;
- dev->nFreeObjects = 0;
-
- for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
- INIT_LIST_HEAD(&dev->objectBucket[i].list);
- dev->objectBucket[i].count = 0;
- }
-
-}
-
-static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
-{
- static int x = 0;
- int i;
- int l = 999;
- int lowest = 999999;
-
- /* First let's see if we can find one that's empty. */
-
- for (i = 0; i < 10 && lowest > 0; i++) {
- x++;
- x %= YAFFS_NOBJECT_BUCKETS;
- if (dev->objectBucket[x].count < lowest) {
- lowest = dev->objectBucket[x].count;
- l = x;
- }
-
- }
-
- /* If we didn't find an empty list, then try
- * looking a bit further for a short one
- */
-
- for (i = 0; i < 10 && lowest > 3; i++) {
- x++;
- x %= YAFFS_NOBJECT_BUCKETS;
- if (dev->objectBucket[x].count < lowest) {
- lowest = dev->objectBucket[x].count;
- l = x;
- }
-
- }
-
- return l;
-}
-
-static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
-{
- int bucket = yaffs_FindNiceObjectBucket(dev);
-
- /* Now find an object value that has not already been taken
- * by scanning the list.
- */
-
- int found = 0;
- struct list_head *i;
-
- __u32 n = (__u32) bucket;
-
- /* yaffs_CheckObjectHashSanity(); */
-
- while (!found) {
- found = 1;
- n += YAFFS_NOBJECT_BUCKETS;
- if (1 || dev->objectBucket[bucket].count > 0) {
- list_for_each(i, &dev->objectBucket[bucket].list) {
- /* If there is already one in the list */
- if (i
- && list_entry(i, yaffs_Object,
- hashLink)->objectId == n) {
- found = 0;
- }
- }
- }
- }
-
-
- return n;
-}
-
-static void yaffs_HashObject(yaffs_Object * in)
-{
- int bucket = yaffs_HashFunction(in->objectId);
- yaffs_Device *dev = in->myDev;
-
- list_add(&in->hashLink, &dev->objectBucket[bucket].list);
- dev->objectBucket[bucket].count++;
-
-}
-
-yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
-{
- int bucket = yaffs_HashFunction(number);
- struct list_head *i;
- yaffs_Object *in;
-
- list_for_each(i, &dev->objectBucket[bucket].list) {
- /* Look if it is in the list */
- if (i) {
- in = list_entry(i, yaffs_Object, hashLink);
- if (in->objectId == number) {
-#ifdef __KERNEL__
- /* Don't tell the VFS about this one if it is defered free */
- if (in->deferedFree)
- return NULL;
-#endif
-
- return in;
- }
- }
- }
-
- return NULL;
-}
-
-yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
- yaffs_ObjectType type)
-{
-
- yaffs_Object *theObject;
- yaffs_Tnode *tn;
-
- if (number < 0) {
- number = yaffs_CreateNewObjectNumber(dev);
- }
-
- theObject = yaffs_AllocateEmptyObject(dev);
- if(!theObject)
- return NULL;
-
- if(type == YAFFS_OBJECT_TYPE_FILE){
- tn = yaffs_GetTnode(dev);
- if(!tn){
- yaffs_FreeObject(theObject);
- return NULL;
- }
- }
-
-
-
- if (theObject) {
- theObject->fake = 0;
- theObject->renameAllowed = 1;
- theObject->unlinkAllowed = 1;
- theObject->objectId = number;
- yaffs_HashObject(theObject);
- theObject->variantType = type;
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_WinFileTimeNow(theObject->win_atime);
- theObject->win_ctime[0] = theObject->win_mtime[0] =
- theObject->win_atime[0];
- theObject->win_ctime[1] = theObject->win_mtime[1] =
- theObject->win_atime[1];
-
-#else
-
- theObject->yst_atime = theObject->yst_mtime =
- theObject->yst_ctime = Y_CURRENT_TIME;
-#endif
- switch (type) {
- case YAFFS_OBJECT_TYPE_FILE:
- theObject->variant.fileVariant.fileSize = 0;
- theObject->variant.fileVariant.scannedFileSize = 0;
- theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
- theObject->variant.fileVariant.topLevel = 0;
- theObject->variant.fileVariant.top = tn;
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- INIT_LIST_HEAD(&theObject->variant.directoryVariant.
- children);
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- case YAFFS_OBJECT_TYPE_HARDLINK:
- case YAFFS_OBJECT_TYPE_SPECIAL:
- /* No action required */
- break;
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- /* todo this should not happen */
- break;
- }
- }
-
- return theObject;
-}
-
-static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
- int number,
- yaffs_ObjectType type)
-{
- yaffs_Object *theObject = NULL;
-
- if (number > 0) {
- theObject = yaffs_FindObjectByNumber(dev, number);
- }
-
- if (!theObject) {
- theObject = yaffs_CreateNewObject(dev, number, type);
- }
-
- return theObject;
-
-}
-
-
-static YCHAR *yaffs_CloneString(const YCHAR * str)
-{
- YCHAR *newStr = NULL;
-
- if (str && *str) {
- newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
- if(newStr)
- yaffs_strcpy(newStr, str);
- }
-
- return newStr;
-
-}
-
-/*
- * Mknod (create) a new object.
- * equivalentObject only has meaning for a hard link;
- * aliasString only has meaning for a sumlink.
- * rdev only has meaning for devices (a subset of special objects)
- */
-
-static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
- yaffs_Object * parent,
- const YCHAR * name,
- __u32 mode,
- __u32 uid,
- __u32 gid,
- yaffs_Object * equivalentObject,
- const YCHAR * aliasString, __u32 rdev)
-{
- yaffs_Object *in;
- YCHAR *str;
-
- yaffs_Device *dev = parent->myDev;
-
- /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
- if (yaffs_FindObjectByName(parent, name)) {
- return NULL;
- }
-
- in = yaffs_CreateNewObject(dev, -1, type);
-
- if(type == YAFFS_OBJECT_TYPE_SYMLINK){
- str = yaffs_CloneString(aliasString);
- if(!str){
- yaffs_FreeObject(in);
- return NULL;
- }
- }
-
-
-
- if (in) {
- in->chunkId = -1;
- in->valid = 1;
- in->variantType = type;
-
- in->yst_mode = mode;
-
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_WinFileTimeNow(in->win_atime);
- in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
- in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
-
-#else
- in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
-
- in->yst_rdev = rdev;
- in->yst_uid = uid;
- in->yst_gid = gid;
-#endif
- in->nDataChunks = 0;
-
- yaffs_SetObjectName(in, name);
- in->dirty = 1;
-
- yaffs_AddObjectToDirectory(parent, in);
-
- in->myDev = parent->myDev;
-
- switch (type) {
- case YAFFS_OBJECT_TYPE_SYMLINK:
- in->variant.symLinkVariant.alias = str;
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- in->variant.hardLinkVariant.equivalentObject =
- equivalentObject;
- in->variant.hardLinkVariant.equivalentObjectId =
- equivalentObject->objectId;
- list_add(&in->hardLinks, &equivalentObject->hardLinks);
- break;
- case YAFFS_OBJECT_TYPE_FILE:
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- case YAFFS_OBJECT_TYPE_SPECIAL:
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- /* do nothing */
- break;
- }
-
- if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
- /* Could not create the object header, fail the creation */
- yaffs_DestroyObject(in);
- in = NULL;
- }
-
- }
-
- return in;
-}
-
-yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
- __u32 mode, __u32 uid, __u32 gid)
-{
- return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
- uid, gid, NULL, NULL, 0);
-}
-
-yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
- __u32 mode, __u32 uid, __u32 gid)
-{
- return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
- mode, uid, gid, NULL, NULL, 0);
-}
-
-yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
- __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
-{
- return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
- uid, gid, NULL, NULL, rdev);
-}
-
-yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
- __u32 mode, __u32 uid, __u32 gid,
- const YCHAR * alias)
-{
- return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
- uid, gid, NULL, alias, 0);
-}
-
-/* yaffs_Link returns the object id of the equivalent object.*/
-yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
- yaffs_Object * equivalentObject)
-{
- /* Get the real object in case we were fed a hard link as an equivalent object */
- equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
-
- if (yaffs_MknodObject
- (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
- equivalentObject, NULL, 0)) {
- return equivalentObject;
- } else {
- return NULL;
- }
-
-}
-
-static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
- const YCHAR * newName, int force, int shadows)
-{
- int unlinkOp;
- int deleteOp;
-
- yaffs_Object *existingTarget;
-
- if (newDir == NULL) {
- newDir = obj->parent; /* use the old directory */
- }
-
- if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
- TENDSTR)));
- YBUG();
- }
-
- /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
- if (obj->myDev->isYaffs2) {
- unlinkOp = (newDir == obj->myDev->unlinkedDir);
- } else {
- unlinkOp = (newDir == obj->myDev->unlinkedDir
- && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
- }
-
- deleteOp = (newDir == obj->myDev->deletedDir);
-
- existingTarget = yaffs_FindObjectByName(newDir, newName);
-
- /* If the object is a file going into the unlinked directory,
- * then it is OK to just stuff it in since duplicate names are allowed.
- * else only proceed if the new name does not exist and if we're putting
- * it into a directory.
- */
- if ((unlinkOp ||
- deleteOp ||
- force ||
- (shadows > 0) ||
- !existingTarget) &&
- newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
- yaffs_SetObjectName(obj, newName);
- obj->dirty = 1;
-
- yaffs_AddObjectToDirectory(newDir, obj);
-
- if (unlinkOp)
- obj->unlinked = 1;
-
- /* If it is a deletion then we mark it as a shrink for gc purposes. */
- if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
- return YAFFS_OK;
- }
-
- return YAFFS_FAIL;
-}
-
-int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
- yaffs_Object * newDir, const YCHAR * newName)
-{
- yaffs_Object *obj;
- yaffs_Object *existingTarget;
- int force = 0;
-
-#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
- /* Special case for case insemsitive systems (eg. WinCE).
- * While look-up is case insensitive, the name isn't.
- * Therefore we might want to change x.txt to X.txt
- */
- if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
- force = 1;
- }
-#endif
-
- obj = yaffs_FindObjectByName(oldDir, oldName);
- /* Check new name to long. */
- if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK &&
- yaffs_strlen(newName) > YAFFS_MAX_ALIAS_LENGTH)
- /* ENAMETOOLONG */
- return YAFFS_FAIL;
- else if (obj->variantType != YAFFS_OBJECT_TYPE_SYMLINK &&
- yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
- /* ENAMETOOLONG */
- return YAFFS_FAIL;
-
- if (obj && obj->renameAllowed) {
-
- /* Now do the handling for an existing target, if there is one */
-
- existingTarget = yaffs_FindObjectByName(newDir, newName);
- if (existingTarget &&
- existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
- !list_empty(&existingTarget->variant.directoryVariant.children)) {
- /* There is a target that is a non-empty directory, so we fail */
- return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
- } else if (existingTarget && existingTarget != obj) {
- /* Nuke the target first, using shadowing,
- * but only if it isn't the same object
- */
- yaffs_ChangeObjectName(obj, newDir, newName, force,
- existingTarget->objectId);
- yaffs_UnlinkObject(existingTarget);
- }
-
- return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
- }
- return YAFFS_FAIL;
-}
-
-/*------------------------- Block Management and Page Allocation ----------------*/
-
-static int yaffs_InitialiseBlocks(yaffs_Device * dev)
-{
- int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
-
- dev->blockInfo = NULL;
- dev->chunkBits = NULL;
-
- dev->allocationBlock = -1; /* force it to get a new one */
-
- /* If the first allocation strategy fails, thry the alternate one */
- dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
- if(!dev->blockInfo){
- dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
- dev->blockInfoAlt = 1;
- }
- else
- dev->blockInfoAlt = 0;
-
- if(dev->blockInfo){
-
- /* Set up dynamic blockinfo stuff. */
- dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
- dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
- if(!dev->chunkBits){
- dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
- dev->chunkBitsAlt = 1;
- }
- else
- dev->chunkBitsAlt = 0;
- }
-
- if (dev->blockInfo && dev->chunkBits) {
- memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
- memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
- return YAFFS_OK;
- }
-
- return YAFFS_FAIL;
-
-}
-
-static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
-{
- if(dev->blockInfoAlt && dev->blockInfo)
- YFREE_ALT(dev->blockInfo);
- else if(dev->blockInfo)
- YFREE(dev->blockInfo);
-
- dev->blockInfoAlt = 0;
-
- dev->blockInfo = NULL;
-
- if(dev->chunkBitsAlt && dev->chunkBits)
- YFREE_ALT(dev->chunkBits);
- else if(dev->chunkBits)
- YFREE(dev->chunkBits);
- dev->chunkBitsAlt = 0;
- dev->chunkBits = NULL;
-}
-
-static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
- yaffs_BlockInfo * bi)
-{
- int i;
- __u32 seq;
- yaffs_BlockInfo *b;
-
- if (!dev->isYaffs2)
- return 1; /* disqualification only applies to yaffs2. */
-
- if (!bi->hasShrinkHeader)
- return 1; /* can gc */
-
- /* Find the oldest dirty sequence number if we don't know it and save it
- * so we don't have to keep recomputing it.
- */
- if (!dev->oldestDirtySequence) {
- seq = dev->sequenceNumber;
-
- for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
- i++) {
- b = yaffs_GetBlockInfo(dev, i);
- if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
- (b->pagesInUse - b->softDeletions) <
- dev->nChunksPerBlock && b->sequenceNumber < seq) {
- seq = b->sequenceNumber;
- }
- }
- dev->oldestDirtySequence = seq;
- }
-
- /* Can't do gc of this block if there are any blocks older than this one that have
- * discarded pages.
- */
- return (bi->sequenceNumber <= dev->oldestDirtySequence);
-
-}
-
-/* FindDiretiestBlock is used to select the dirtiest block (or close enough)
- * for garbage collection.
- */
-
-static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
- int aggressive)
-{
-
- int b = dev->currentDirtyChecker;
-
- int i;
- int iterations;
- int dirtiest = -1;
- int pagesInUse = 0;
- int prioritised=0;
- yaffs_BlockInfo *bi;
- int pendingPrioritisedExist = 0;
-
- /* First let's see if we need to grab a prioritised block */
- if(dev->hasPendingPrioritisedGCs){
- for(i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++){
-
- bi = yaffs_GetBlockInfo(dev, i);
- //yaffs_VerifyBlock(dev,bi,i);
-
- if(bi->gcPrioritise) {
- pendingPrioritisedExist = 1;
- if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
- yaffs_BlockNotDisqualifiedFromGC(dev, bi)){
- pagesInUse = (bi->pagesInUse - bi->softDeletions);
- dirtiest = i;
- prioritised = 1;
- aggressive = 1; /* Fool the non-aggressive skip logiv below */
- }
- }
- }
-
- if(!pendingPrioritisedExist) /* None found, so we can clear this */
- dev->hasPendingPrioritisedGCs = 0;
- }
-
- /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
- * search harder.
- * else (we're doing a leasurely gc), then we only bother to do this if the
- * block has only a few pages in use.
- */
-
- dev->nonAggressiveSkip--;
-
- if (!aggressive && (dev->nonAggressiveSkip > 0)) {
- return -1;
- }
-
- if(!prioritised)
- pagesInUse =
- (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
-
- if (aggressive) {
- iterations =
- dev->internalEndBlock - dev->internalStartBlock + 1;
- } else {
- iterations =
- dev->internalEndBlock - dev->internalStartBlock + 1;
- iterations = iterations / 16;
- if (iterations > 200) {
- iterations = 200;
- }
- }
-
- for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
- b++;
- if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
- b = dev->internalStartBlock;
- }
-
- if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
- T(YAFFS_TRACE_ERROR,
- (TSTR("**>> Block %d is not valid" TENDSTR), b));
- YBUG();
- }
-
- bi = yaffs_GetBlockInfo(dev, b);
-
-#if 0
- if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
- dirtiest = b;
- pagesInUse = 0;
- }
- else
-#endif
-
- if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
- (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
- yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
- dirtiest = b;
- pagesInUse = (bi->pagesInUse - bi->softDeletions);
- }
- }
-
- dev->currentDirtyChecker = b;
-
- if (dirtiest > 0) {
- T(YAFFS_TRACE_GC,
- (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
- dev->nChunksPerBlock - pagesInUse,prioritised));
- }
-
- dev->oldestDirtySequence = 0;
-
- if (dirtiest > 0) {
- dev->nonAggressiveSkip = 4;
- }
-
- return dirtiest;
-}
-
-static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
-{
- yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
-
- int erasedOk = 0;
-
- /* If the block is still healthy erase it and mark as clean.
- * If the block has had a data failure, then retire it.
- */
-
- T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
- (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
- blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
-
- bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
-
- if (!bi->needsRetiring) {
- yaffs_InvalidateCheckpoint(dev);
- erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
- if (!erasedOk) {
- dev->nErasureFailures++;
- T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
- (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
- }
- }
-
- if (erasedOk &&
- ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
- int i;
- for (i = 0; i < dev->nChunksPerBlock; i++) {
- if (!yaffs_CheckChunkErased
- (dev, blockNo * dev->nChunksPerBlock + i)) {
- T(YAFFS_TRACE_ERROR,
- (TSTR
- (">>Block %d erasure supposedly OK, but chunk %d not erased"
- TENDSTR), blockNo, i));
- }
- }
- }
-
- if (erasedOk) {
- /* Clean it up... */
- bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
- dev->nErasedBlocks++;
- bi->pagesInUse = 0;
- bi->softDeletions = 0;
- bi->hasShrinkHeader = 0;
- bi->skipErasedCheck = 1; /* This is clean, so no need to check */
- bi->gcPrioritise = 0;
- yaffs_ClearChunkBits(dev, blockNo);
-
- T(YAFFS_TRACE_ERASE,
- (TSTR("Erased block %d" TENDSTR), blockNo));
- } else {
- dev->nFreeChunks -= dev->nChunksPerBlock; /* We lost a block of free space */
-
- yaffs_RetireBlock(dev, blockNo);
- T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
- (TSTR("**>> Block %d retired" TENDSTR), blockNo));
- }
-}
-
-static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
-{
- int i;
-
- yaffs_BlockInfo *bi;
-
- if (dev->nErasedBlocks < 1) {
- /* Hoosterman we've got a problem.
- * Can't get space to gc
- */
- T(YAFFS_TRACE_ERROR,
- (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
-
- return -1;
- }
-
- /* Find an empty block. */
-
- for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
- dev->allocationBlockFinder++;
- if (dev->allocationBlockFinder < dev->internalStartBlock
- || dev->allocationBlockFinder > dev->internalEndBlock) {
- dev->allocationBlockFinder = dev->internalStartBlock;
- }
-
- bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
-
- if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
- bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
- dev->sequenceNumber++;
- bi->sequenceNumber = dev->sequenceNumber;
- dev->nErasedBlocks--;
- T(YAFFS_TRACE_ALLOCATE,
- (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
- dev->allocationBlockFinder, dev->sequenceNumber,
- dev->nErasedBlocks));
- return dev->allocationBlockFinder;
- }
- }
-
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("yaffs tragedy: no more eraased blocks, but there should have been %d"
- TENDSTR), dev->nErasedBlocks));
-
- return -1;
-}
-
-
-// Check if there's space to allocate...
-// Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
-static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
-{
- int reservedChunks;
- int reservedBlocks = dev->nReservedBlocks;
- int checkpointBlocks;
-
- checkpointBlocks = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
- if(checkpointBlocks < 0)
- checkpointBlocks = 0;
-
- reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
-
- return (dev->nFreeChunks > reservedChunks);
-}
-
-static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve, yaffs_BlockInfo **blockUsedPtr)
-{
- int retVal;
- yaffs_BlockInfo *bi;
-
- if (dev->allocationBlock < 0) {
- /* Get next block to allocate off */
- dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
- dev->allocationPage = 0;
- }
-
- if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
- /* Not enough space to allocate unless we're allowed to use the reserve. */
- return -1;
- }
-
- if (dev->nErasedBlocks < dev->nReservedBlocks
- && dev->allocationPage == 0) {
- T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
- }
-
- /* Next page please.... */
- if (dev->allocationBlock >= 0) {
- bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
-
- retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
- dev->allocationPage;
- bi->pagesInUse++;
- yaffs_SetChunkBit(dev, dev->allocationBlock,
- dev->allocationPage);
-
- dev->allocationPage++;
-
- dev->nFreeChunks--;
-
- /* If the block is full set the state to full */
- if (dev->allocationPage >= dev->nChunksPerBlock) {
- bi->blockState = YAFFS_BLOCK_STATE_FULL;
- dev->allocationBlock = -1;
- }
-
- if(blockUsedPtr)
- *blockUsedPtr = bi;
-
- return retVal;
- }
-
- T(YAFFS_TRACE_ERROR,
- (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
-
- return -1;
-}
-
-static int yaffs_GetErasedChunks(yaffs_Device * dev)
-{
- int n;
-
- n = dev->nErasedBlocks * dev->nChunksPerBlock;
-
- if (dev->allocationBlock > 0) {
- n += (dev->nChunksPerBlock - dev->allocationPage);
- }
-
- return n;
-
-}
-
-static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
-{
- int oldChunk;
- int newChunk;
- int chunkInBlock;
- int markNAND;
- int retVal = YAFFS_OK;
- int cleanups = 0;
- int i;
- int isCheckpointBlock;
- int matchingChunk;
-
- int chunksBefore = yaffs_GetErasedChunks(dev);
- int chunksAfter;
-
- yaffs_ExtendedTags tags;
-
- yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
-
- yaffs_Object *object;
-
- isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
-
- bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
-
- T(YAFFS_TRACE_TRACING,
- (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
- bi->pagesInUse, bi->hasShrinkHeader));
-
- /*yaffs_VerifyFreeChunks(dev); */
-
- bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
-
- /* Take off the number of soft deleted entries because
- * they're going to get really deleted during GC.
- */
- dev->nFreeChunks -= bi->softDeletions;
-
- dev->isDoingGC = 1;
-
- if (isCheckpointBlock ||
- !yaffs_StillSomeChunkBits(dev, block)) {
- T(YAFFS_TRACE_TRACING,
- (TSTR
- ("Collecting block %d that has no chunks in use" TENDSTR),
- block));
- yaffs_BlockBecameDirty(dev, block);
- } else {
-
- __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
-
- yaffs_VerifyBlock(dev,bi,block);
-
- for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
- chunkInBlock < dev->nChunksPerBlock
- && yaffs_StillSomeChunkBits(dev, block);
- chunkInBlock++, oldChunk++) {
- if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
-
- /* This page is in use and might need to be copied off */
-
- markNAND = 1;
-
- yaffs_InitialiseTags(&tags);
-
- yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
- buffer, &tags);
-
- object =
- yaffs_FindObjectByNumber(dev,
- tags.objectId);
-
- T(YAFFS_TRACE_GC_DETAIL,
- (TSTR
- ("Collecting page %d, %d %d %d " TENDSTR),
- chunkInBlock, tags.objectId, tags.chunkId,
- tags.byteCount));
-
- if(object && !yaffs_SkipVerification(dev)){
- if(tags.chunkId == 0)
- matchingChunk = object->chunkId;
- else if(object->softDeleted)
- matchingChunk = oldChunk; /* Defeat the test */
- else
- matchingChunk = yaffs_FindChunkInFile(object,tags.chunkId,NULL);
-
- if(oldChunk != matchingChunk)
- T(YAFFS_TRACE_ERROR,
- (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
- oldChunk,matchingChunk,tags.objectId, tags.chunkId));
-
- }
-
- if (!object) {
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("page %d in gc has no object: %d %d %d "
- TENDSTR), oldChunk,
- tags.objectId, tags.chunkId, tags.byteCount));
- }
-
- if (object && object->deleted
- && tags.chunkId != 0) {
- /* Data chunk in a deleted file, throw it away
- * It's a soft deleted data chunk,
- * No need to copy this, just forget about it and
- * fix up the object.
- */
-
- object->nDataChunks--;
-
- if (object->nDataChunks <= 0) {
- /* remeber to clean up the object */
- dev->gcCleanupList[cleanups] =
- tags.objectId;
- cleanups++;
- }
- markNAND = 0;
- } else if (0
- /* Todo object && object->deleted && object->nDataChunks == 0 */
- ) {
- /* Deleted object header with no data chunks.
- * Can be discarded and the file deleted.
- */
- object->chunkId = 0;
- yaffs_FreeTnode(object->myDev,
- object->variant.
- fileVariant.top);
- object->variant.fileVariant.top = NULL;
- yaffs_DoGenericObjectDeletion(object);
-
- } else if (object) {
- /* It's either a data chunk in a live file or
- * an ObjectHeader, so we're interested in it.
- * NB Need to keep the ObjectHeaders of deleted files
- * until the whole file has been deleted off
- */
- tags.serialNumber++;
-
- dev->nGCCopies++;
-
- if (tags.chunkId == 0) {
- /* It is an object Id,
- * We need to nuke the shrinkheader flags first
- * We no longer want the shrinkHeader flag since its work is done
- * and if it is left in place it will mess up scanning.
- * Also, clear out any shadowing stuff
- */
-
- yaffs_ObjectHeader *oh;
- oh = (yaffs_ObjectHeader *)buffer;
- oh->isShrink = 0;
- oh->shadowsObject = -1;
- tags.extraShadows = 0;
- tags.extraIsShrinkHeader = 0;
-
- yaffs_VerifyObjectHeader(object,oh,&tags,1);
- }
-
- newChunk =
- yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
-
- if (newChunk < 0) {
- retVal = YAFFS_FAIL;
- } else {
-
- /* Ok, now fix up the Tnodes etc. */
-
- if (tags.chunkId == 0) {
- /* It's a header */
- object->chunkId = newChunk;
- object->serial = tags.serialNumber;
- } else {
- /* It's a data chunk */
- yaffs_PutChunkIntoFile
- (object,
- tags.chunkId,
- newChunk, 0);
- }
- }
- }
-
- yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
-
- }
- }
-
- yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
-
-
- /* Do any required cleanups */
- for (i = 0; i < cleanups; i++) {
- /* Time to delete the file too */
- object =
- yaffs_FindObjectByNumber(dev,
- dev->gcCleanupList[i]);
- if (object) {
- yaffs_FreeTnode(dev,
- object->variant.fileVariant.
- top);
- object->variant.fileVariant.top = NULL;
- T(YAFFS_TRACE_GC,
- (TSTR
- ("yaffs: About to finally delete object %d"
- TENDSTR), object->objectId));
- yaffs_DoGenericObjectDeletion(object);
- object->myDev->nDeletedFiles--;
- }
-
- }
-
- }
-
- yaffs_VerifyCollectedBlock(dev,bi,block);
-
- if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
- T(YAFFS_TRACE_GC,
- (TSTR
- ("gc did not increase free chunks before %d after %d"
- TENDSTR), chunksBefore, chunksAfter));
- }
-
- dev->isDoingGC = 0;
-
- return YAFFS_OK;
-}
-
-/* New garbage collector
- * If we're very low on erased blocks then we do aggressive garbage collection
- * otherwise we do "leasurely" garbage collection.
- * Aggressive gc looks further (whole array) and will accept less dirty blocks.
- * Passive gc only inspects smaller areas and will only accept more dirty blocks.
- *
- * The idea is to help clear out space in a more spread-out manner.
- * Dunno if it really does anything useful.
- */
-static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
-{
- int block;
- int aggressive;
- int gcOk = YAFFS_OK;
- int maxTries = 0;
-
- int checkpointBlockAdjust;
-
- if (dev->isDoingGC) {
- /* Bail out so we don't get recursive gc */
- return YAFFS_OK;
- }
-
- /* This loop should pass the first time.
- * We'll only see looping here if the erase of the collected block fails.
- */
-
- do {
- maxTries++;
-
- checkpointBlockAdjust = (dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint);
- if(checkpointBlockAdjust < 0)
- checkpointBlockAdjust = 0;
-
- if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
- /* We need a block soon...*/
- aggressive = 1;
- } else {
- /* We're in no hurry */
- aggressive = 0;
- }
-
- block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
-
- if (block > 0) {
- dev->garbageCollections++;
- if (!aggressive) {
- dev->passiveGarbageCollections++;
- }
-
- T(YAFFS_TRACE_GC,
- (TSTR
- ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
- dev->nErasedBlocks, aggressive));
-
- gcOk = yaffs_GarbageCollectBlock(dev, block);
- }
-
- if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
- T(YAFFS_TRACE_GC,
- (TSTR
- ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
- TENDSTR), dev->nErasedBlocks, maxTries, block));
- }
- } while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
- && (maxTries < 2));
-
- return aggressive ? gcOk : YAFFS_OK;
-}
-
-/*------------------------- TAGS --------------------------------*/
-
-static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
- int chunkInObject)
-{
- return (tags->chunkId == chunkInObject &&
- tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
-
-}
-
-
-/*-------------------- Data file manipulation -----------------*/
-
-static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
- yaffs_ExtendedTags * tags)
-{
- /*Get the Tnode, then get the level 0 offset chunk offset */
- yaffs_Tnode *tn;
- int theChunk = -1;
- yaffs_ExtendedTags localTags;
- int retVal = -1;
-
- yaffs_Device *dev = in->myDev;
-
- if (!tags) {
- /* Passed a NULL, so use our own tags space */
- tags = &localTags;
- }
-
- tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
-
- if (tn) {
- theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
-
- retVal =
- yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
- chunkInInode);
- }
- return retVal;
-}
-
-static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
- yaffs_ExtendedTags * tags)
-{
- /* Get the Tnode, then get the level 0 offset chunk offset */
- yaffs_Tnode *tn;
- int theChunk = -1;
- yaffs_ExtendedTags localTags;
-
- yaffs_Device *dev = in->myDev;
- int retVal = -1;
-
- if (!tags) {
- /* Passed a NULL, so use our own tags space */
- tags = &localTags;
- }
-
- tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
-
- if (tn) {
-
- theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
-
- retVal =
- yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
- chunkInInode);
-
- /* Delete the entry in the filestructure (if found) */
- if (retVal != -1) {
- yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
- }
- } else {
- /*T(("No level 0 found for %d\n", chunkInInode)); */
- }
-
- if (retVal == -1) {
- /* T(("Could not find %d to delete\n",chunkInInode)); */
- }
- return retVal;
-}
-
-#ifdef YAFFS_PARANOID
-
-static int yaffs_CheckFileSanity(yaffs_Object * in)
-{
- int chunk;
- int nChunks;
- int fSize;
- int failed = 0;
- int objId;
- yaffs_Tnode *tn;
- yaffs_Tags localTags;
- yaffs_Tags *tags = &localTags;
- int theChunk;
- int chunkDeleted;
-
- if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
- /* T(("Object not a file\n")); */
- return YAFFS_FAIL;
- }
-
- objId = in->objectId;
- fSize = in->variant.fileVariant.fileSize;
- nChunks =
- (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
-
- for (chunk = 1; chunk <= nChunks; chunk++) {
- tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
- chunk);
-
- if (tn) {
-
- theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
-
- if (yaffs_CheckChunkBits
- (dev, theChunk / dev->nChunksPerBlock,
- theChunk % dev->nChunksPerBlock)) {
-
- yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
- tags,
- &chunkDeleted);
- if (yaffs_TagsMatch
- (tags, in->objectId, chunk, chunkDeleted)) {
- /* found it; */
-
- }
- } else {
-
- failed = 1;
- }
-
- } else {
- /* T(("No level 0 found for %d\n", chunk)); */
- }
- }
-
- return failed ? YAFFS_FAIL : YAFFS_OK;
-}
-
-#endif
-
-static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
- int chunkInNAND, int inScan)
-{
- /* NB inScan is zero unless scanning.
- * For forward scanning, inScan is > 0;
- * for backward scanning inScan is < 0
- */
-
- yaffs_Tnode *tn;
- yaffs_Device *dev = in->myDev;
- int existingChunk;
- yaffs_ExtendedTags existingTags;
- yaffs_ExtendedTags newTags;
- unsigned existingSerial, newSerial;
-
- if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
- /* Just ignore an attempt at putting a chunk into a non-file during scanning
- * If it is not during Scanning then something went wrong!
- */
- if (!inScan) {
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("yaffs tragedy:attempt to put data chunk into a non-file"
- TENDSTR)));
- YBUG();
- }
-
- yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
- return YAFFS_OK;
- }
-
- tn = yaffs_AddOrFindLevel0Tnode(dev,
- &in->variant.fileVariant,
- chunkInInode,
- NULL);
- if (!tn) {
- return YAFFS_FAIL;
- }
-
- existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
-
- if (inScan != 0) {
- /* If we're scanning then we need to test for duplicates
- * NB This does not need to be efficient since it should only ever
- * happen when the power fails during a write, then only one
- * chunk should ever be affected.
- *
- * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
- * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
- */
-
- if (existingChunk != 0) {
- /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
- * thus we have to do a FindChunkInFile to get the real chunk id.
- *
- * We have a duplicate now we need to decide which one to use:
- *
- * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
- * Forward scanning YAFFS2: The new one is what we use, dump the old one.
- * YAFFS1: Get both sets of tags and compare serial numbers.
- */
-
- if (inScan > 0) {
- /* Only do this for forward scanning */
- yaffs_ReadChunkWithTagsFromNAND(dev,
- chunkInNAND,
- NULL, &newTags);
-
- /* Do a proper find */
- existingChunk =
- yaffs_FindChunkInFile(in, chunkInInode,
- &existingTags);
- }
-
- if (existingChunk <= 0) {
- /*Hoosterman - how did this happen? */
-
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("yaffs tragedy: existing chunk < 0 in scan"
- TENDSTR)));
-
- }
-
- /* NB The deleted flags should be false, otherwise the chunks will
- * not be loaded during a scan
- */
-
- newSerial = newTags.serialNumber;
- existingSerial = existingTags.serialNumber;
-
- if ((inScan > 0) &&
- (in->myDev->isYaffs2 ||
- existingChunk <= 0 ||
- ((existingSerial + 1) & 3) == newSerial)) {
- /* Forward scanning.
- * Use new
- * Delete the old one and drop through to update the tnode
- */
- yaffs_DeleteChunk(dev, existingChunk, 1,
- __LINE__);
- } else {
- /* Backward scanning or we want to use the existing one
- * Use existing.
- * Delete the new one and return early so that the tnode isn't changed
- */
- yaffs_DeleteChunk(dev, chunkInNAND, 1,
- __LINE__);
- return YAFFS_OK;
- }
- }
-
- }
-
- if (existingChunk == 0) {
- in->nDataChunks++;
- }
-
- yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
-
- return YAFFS_OK;
-}
-
-static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
- __u8 * buffer)
-{
- int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
-
- if (chunkInNAND >= 0) {
- return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
- buffer,NULL);
- } else {
- T(YAFFS_TRACE_NANDACCESS,
- (TSTR("Chunk %d not found zero instead" TENDSTR),
- chunkInNAND));
- /* get sane (zero) data if you read a hole */
- memset(buffer, 0, in->myDev->nDataBytesPerChunk);
- return 0;
- }
-
-}
-
-void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
-{
- int block;
- int page;
- yaffs_ExtendedTags tags;
- yaffs_BlockInfo *bi;
-
- if (chunkId <= 0)
- return;
-
-
- dev->nDeletions++;
- block = chunkId / dev->nChunksPerBlock;
- page = chunkId % dev->nChunksPerBlock;
-
-
- if(!yaffs_CheckChunkBit(dev,block,page))
- T(YAFFS_TRACE_VERIFY,
- (TSTR("Deleting invalid chunk %d"TENDSTR),
- chunkId));
-
- bi = yaffs_GetBlockInfo(dev, block);
-
- T(YAFFS_TRACE_DELETION,
- (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
-
- if (markNAND &&
- bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
-
- yaffs_InitialiseTags(&tags);
-
- tags.chunkDeleted = 1;
-
- yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
- yaffs_HandleUpdateChunk(dev, chunkId, &tags);
- } else {
- dev->nUnmarkedDeletions++;
- }
-
- /* Pull out of the management area.
- * If the whole block became dirty, this will kick off an erasure.
- */
- if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
- bi->blockState == YAFFS_BLOCK_STATE_FULL ||
- bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
- bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
- dev->nFreeChunks++;
-
- yaffs_ClearChunkBit(dev, block, page);
-
- bi->pagesInUse--;
-
- if (bi->pagesInUse == 0 &&
- !bi->hasShrinkHeader &&
- bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
- bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
- yaffs_BlockBecameDirty(dev, block);
- }
-
- } else {
- /* T(("Bad news deleting chunk %d\n",chunkId)); */
- }
-
-}
-
-static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
- const __u8 * buffer, int nBytes,
- int useReserve)
-{
- /* Find old chunk Need to do this to get serial number
- * Write new one and patch into tree.
- * Invalidate old tags.
- */
-
- int prevChunkId;
- yaffs_ExtendedTags prevTags;
-
- int newChunkId;
- yaffs_ExtendedTags newTags;
-
- yaffs_Device *dev = in->myDev;
-
- yaffs_CheckGarbageCollection(dev);
-
- /* Get the previous chunk at this location in the file if it exists */
- prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
-
- /* Set up new tags */
- yaffs_InitialiseTags(&newTags);
-
- newTags.chunkId = chunkInInode;
- newTags.objectId = in->objectId;
- newTags.serialNumber =
- (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
- newTags.byteCount = nBytes;
-
- newChunkId =
- yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
- useReserve);
-
- if (newChunkId >= 0) {
- yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
-
- if (prevChunkId >= 0) {
- yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
-
- }
-
- yaffs_CheckFileSanity(in);
- }
- return newChunkId;
-
-}
-
-/* UpdateObjectHeader updates the header on NAND for an object.
- * If name is not NULL, then that new name is used.
- */
-int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
- int isShrink, int shadows)
-{
-
- yaffs_BlockInfo *bi;
-
- yaffs_Device *dev = in->myDev;
-
- int prevChunkId;
- int retVal = 0;
- int result = 0;
-
- int newChunkId;
- yaffs_ExtendedTags newTags;
- yaffs_ExtendedTags oldTags;
-
- __u8 *buffer = NULL;
- YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
-
- yaffs_ObjectHeader *oh = NULL;
-
- yaffs_strcpy(oldName,"silly old name");
-
- if (!in->fake || force) {
-
- yaffs_CheckGarbageCollection(dev);
- yaffs_CheckObjectDetailsLoaded(in);
-
- buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
- oh = (yaffs_ObjectHeader *) buffer;
-
- prevChunkId = in->chunkId;
-
- if (prevChunkId >= 0) {
- result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
- buffer, &oldTags);
-
- yaffs_VerifyObjectHeader(in,oh,&oldTags,0);
-
- memcpy(oldName, oh->name, sizeof(oh->name));
- }
-
- memset(buffer, 0xFF, dev->nDataBytesPerChunk);
-
- oh->type = in->variantType;
- oh->yst_mode = in->yst_mode;
- oh->shadowsObject = shadows;
-
-#ifdef CONFIG_YAFFS_WINCE
- oh->win_atime[0] = in->win_atime[0];
- oh->win_ctime[0] = in->win_ctime[0];
- oh->win_mtime[0] = in->win_mtime[0];
- oh->win_atime[1] = in->win_atime[1];
- oh->win_ctime[1] = in->win_ctime[1];
- oh->win_mtime[1] = in->win_mtime[1];
-#else
- oh->yst_uid = in->yst_uid;
- oh->yst_gid = in->yst_gid;
- oh->yst_atime = in->yst_atime;
- oh->yst_mtime = in->yst_mtime;
- oh->yst_ctime = in->yst_ctime;
- oh->yst_rdev = in->yst_rdev;
-#endif
- if (in->parent) {
- oh->parentObjectId = in->parent->objectId;
- } else {
- oh->parentObjectId = 0;
- }
-
- if (name && *name) {
- memset(oh->name, 0, sizeof(oh->name));
- yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
- } else if (prevChunkId>=0) {
- memcpy(oh->name, oldName, sizeof(oh->name));
- } else {
- memset(oh->name, 0, sizeof(oh->name));
- }
-
- oh->isShrink = isShrink;
-
- switch (in->variantType) {
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- /* Should not happen */
- break;
- case YAFFS_OBJECT_TYPE_FILE:
- oh->fileSize =
- (oh->parentObjectId == YAFFS_OBJECTID_DELETED
- || oh->parentObjectId ==
- YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
- fileVariant.fileSize;
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- oh->equivalentObjectId =
- in->variant.hardLinkVariant.equivalentObjectId;
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- /* Do nothing */
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- /* Do nothing */
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- yaffs_strncpy(oh->alias,
- in->variant.symLinkVariant.alias,
- YAFFS_MAX_ALIAS_LENGTH);
- oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
- break;
- }
-
- /* Tags */
- yaffs_InitialiseTags(&newTags);
- in->serial++;
- newTags.chunkId = 0;
- newTags.objectId = in->objectId;
- newTags.serialNumber = in->serial;
-
- /* Add extra info for file header */
-
- newTags.extraHeaderInfoAvailable = 1;
- newTags.extraParentObjectId = oh->parentObjectId;
- newTags.extraFileLength = oh->fileSize;
- newTags.extraIsShrinkHeader = oh->isShrink;
- newTags.extraEquivalentObjectId = oh->equivalentObjectId;
- newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
- newTags.extraObjectType = in->variantType;
-
- yaffs_VerifyObjectHeader(in,oh,&newTags,1);
-
- /* Create new chunk in NAND */
- newChunkId =
- yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
- (prevChunkId >= 0) ? 1 : 0);
-
- if (newChunkId >= 0) {
-
- in->chunkId = newChunkId;
-
- if (prevChunkId >= 0) {
- yaffs_DeleteChunk(dev, prevChunkId, 1,
- __LINE__);
- }
-
- if(!yaffs_ObjectHasCachedWriteData(in))
- in->dirty = 0;
-
- /* If this was a shrink, then mark the block that the chunk lives on */
- if (isShrink) {
- bi = yaffs_GetBlockInfo(in->myDev,
- newChunkId /in->myDev-> nChunksPerBlock);
- bi->hasShrinkHeader = 1;
- }
-
- }
-
- retVal = newChunkId;
-
- }
-
- if (buffer)
- yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
-
- return retVal;
-}
-
-/*------------------------ Short Operations Cache ----------------------------------------
- * In many situations where there is no high level buffering (eg WinCE) a lot of
- * reads might be short sequential reads, and a lot of writes may be short
- * sequential writes. eg. scanning/writing a jpeg file.
- * In these cases, a short read/write cache can provide a huge perfomance benefit
- * with dumb-as-a-rock code.
- * In Linux, the page cache provides read buffering aand the short op cache provides write
- * buffering.
- *
- * There are a limited number (~10) of cache chunks per device so that we don't
- * need a very intelligent search.
- */
-
-static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
-{
- yaffs_Device *dev = obj->myDev;
- int i;
- yaffs_ChunkCache *cache;
- int nCaches = obj->myDev->nShortOpCaches;
-
- for(i = 0; i < nCaches; i++){
- cache = &dev->srCache[i];
- if (cache->object == obj &&
- cache->dirty)
- return 1;
- }
-
- return 0;
-}
-
-
-static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
-{
- yaffs_Device *dev = obj->myDev;
- int lowest = -99; /* Stop compiler whining. */
- int i;
- yaffs_ChunkCache *cache;
- int chunkWritten = 0;
- int nCaches = obj->myDev->nShortOpCaches;
-
- if (nCaches > 0) {
- do {
- cache = NULL;
-
- /* Find the dirty cache for this object with the lowest chunk id. */
- for (i = 0; i < nCaches; i++) {
- if (dev->srCache[i].object == obj &&
- dev->srCache[i].dirty) {
- if (!cache
- || dev->srCache[i].chunkId <
- lowest) {
- cache = &dev->srCache[i];
- lowest = cache->chunkId;
- }
- }
- }
-
- if (cache && !cache->locked) {
- /* Write it out and free it up */
-
- chunkWritten =
- yaffs_WriteChunkDataToObject(cache->object,
- cache->chunkId,
- cache->data,
- cache->nBytes,
- 1);
- cache->dirty = 0;
- cache->object = NULL;
- }
-
- } while (cache && chunkWritten > 0);
-
- if (cache) {
- /* Hoosterman, disk full while writing cache out. */
- T(YAFFS_TRACE_ERROR,
- (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
-
- }
- }
-
-}
-
-/*yaffs_FlushEntireDeviceCache(dev)
- *
- *
- */
-
-void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
-{
- yaffs_Object *obj;
- int nCaches = dev->nShortOpCaches;
- int i;
-
- /* Find a dirty object in the cache and flush it...
- * until there are no further dirty objects.
- */
- do {
- obj = NULL;
- for( i = 0; i < nCaches && !obj; i++) {
- if (dev->srCache[i].object &&
- dev->srCache[i].dirty)
- obj = dev->srCache[i].object;
-
- }
- if(obj)
- yaffs_FlushFilesChunkCache(obj);
-
- } while(obj);
-
-}
-
-
-/* Grab us a cache chunk for use.
- * First look for an empty one.
- * Then look for the least recently used non-dirty one.
- * Then look for the least recently used dirty one...., flush and look again.
- */
-static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
-{
- int i;
- int usage;
- int theOne;
-
- if (dev->nShortOpCaches > 0) {
- for (i = 0; i < dev->nShortOpCaches; i++) {
- if (!dev->srCache[i].object)
- return &dev->srCache[i];
- }
-
- return NULL;
-
- theOne = -1;
- usage = 0; /* just to stop the compiler grizzling */
-
- for (i = 0; i < dev->nShortOpCaches; i++) {
- if (!dev->srCache[i].dirty &&
- ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
- theOne < 0)) {
- usage = dev->srCache[i].lastUse;
- theOne = i;
- }
- }
-
-
- return theOne >= 0 ? &dev->srCache[theOne] : NULL;
- } else {
- return NULL;
- }
-
-}
-
-static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
-{
- yaffs_ChunkCache *cache;
- yaffs_Object *theObj;
- int usage;
- int i;
- int pushout;
-
- if (dev->nShortOpCaches > 0) {
- /* Try find a non-dirty one... */
-
- cache = yaffs_GrabChunkCacheWorker(dev);
-
- if (!cache) {
- /* They were all dirty, find the last recently used object and flush
- * its cache, then find again.
- * NB what's here is not very accurate, we actually flush the object
- * the last recently used page.
- */
-
- /* With locking we can't assume we can use entry zero */
-
- theObj = NULL;
- usage = -1;
- cache = NULL;
- pushout = -1;
-
- for (i = 0; i < dev->nShortOpCaches; i++) {
- if (dev->srCache[i].object &&
- !dev->srCache[i].locked &&
- (dev->srCache[i].lastUse < usage || !cache))
- {
- usage = dev->srCache[i].lastUse;
- theObj = dev->srCache[i].object;
- cache = &dev->srCache[i];
- pushout = i;
- }
- }
-
- if (!cache || cache->dirty) {
- /* Flush and try again */
- yaffs_FlushFilesChunkCache(theObj);
- cache = yaffs_GrabChunkCacheWorker(dev);
- }
-
- }
- return cache;
- } else
- return NULL;
-
-}
-
-/* Find a cached chunk */
-static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
- int chunkId)
-{
- yaffs_Device *dev = obj->myDev;
- int i;
- if (dev->nShortOpCaches > 0) {
- for (i = 0; i < dev->nShortOpCaches; i++) {
- if (dev->srCache[i].object == obj &&
- dev->srCache[i].chunkId == chunkId) {
- dev->cacheHits++;
-
- return &dev->srCache[i];
- }
- }
- }
- return NULL;
-}
-
-/* Mark the chunk for the least recently used algorithym */
-static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
- int isAWrite)
-{
-
- if (dev->nShortOpCaches > 0) {
- if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
- /* Reset the cache usages */
- int i;
- for (i = 1; i < dev->nShortOpCaches; i++) {
- dev->srCache[i].lastUse = 0;
- }
- dev->srLastUse = 0;
- }
-
- dev->srLastUse++;
-
- cache->lastUse = dev->srLastUse;
-
- if (isAWrite) {
- cache->dirty = 1;
- }
- }
-}
-
-/* Invalidate a single cache page.
- * Do this when a whole page gets written,
- * ie the short cache for this page is no longer valid.
- */
-static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
-{
- if (object->myDev->nShortOpCaches > 0) {
- yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
-
- if (cache) {
- cache->object = NULL;
- }
- }
-}
-
-/* Invalidate all the cache pages associated with this object
- * Do this whenever ther file is deleted or resized.
- */
-static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
-{
- int i;
- yaffs_Device *dev = in->myDev;
-
- if (dev->nShortOpCaches > 0) {
- /* Invalidate it. */
- for (i = 0; i < dev->nShortOpCaches; i++) {
- if (dev->srCache[i].object == in) {
- dev->srCache[i].object = NULL;
- }
- }
- }
-}
-
-/*--------------------- Checkpointing --------------------*/
-
-
-static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
-{
- yaffs_CheckpointValidity cp;
-
- memset(&cp,0,sizeof(cp));
-
- cp.structType = sizeof(cp);
- cp.magic = YAFFS_MAGIC;
- cp.version = YAFFS_CHECKPOINT_VERSION;
- cp.head = (head) ? 1 : 0;
-
- return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
- 1 : 0;
-}
-
-static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
-{
- yaffs_CheckpointValidity cp;
- int ok;
-
- ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
-
- if(ok)
- ok = (cp.structType == sizeof(cp)) &&
- (cp.magic == YAFFS_MAGIC) &&
- (cp.version == YAFFS_CHECKPOINT_VERSION) &&
- (cp.head == ((head) ? 1 : 0));
- return ok ? 1 : 0;
-}
-
-static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
- yaffs_Device *dev)
-{
- cp->nErasedBlocks = dev->nErasedBlocks;
- cp->allocationBlock = dev->allocationBlock;
- cp->allocationPage = dev->allocationPage;
- cp->nFreeChunks = dev->nFreeChunks;
-
- cp->nDeletedFiles = dev->nDeletedFiles;
- cp->nUnlinkedFiles = dev->nUnlinkedFiles;
- cp->nBackgroundDeletions = dev->nBackgroundDeletions;
- cp->sequenceNumber = dev->sequenceNumber;
- cp->oldestDirtySequence = dev->oldestDirtySequence;
-
-}
-
-static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
- yaffs_CheckpointDevice *cp)
-{
- dev->nErasedBlocks = cp->nErasedBlocks;
- dev->allocationBlock = cp->allocationBlock;
- dev->allocationPage = cp->allocationPage;
- dev->nFreeChunks = cp->nFreeChunks;
-
- dev->nDeletedFiles = cp->nDeletedFiles;
- dev->nUnlinkedFiles = cp->nUnlinkedFiles;
- dev->nBackgroundDeletions = cp->nBackgroundDeletions;
- dev->sequenceNumber = cp->sequenceNumber;
- dev->oldestDirtySequence = cp->oldestDirtySequence;
-}
-
-
-static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
-{
- yaffs_CheckpointDevice cp;
- __u32 nBytes;
- __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
-
- int ok;
-
- /* Write device runtime values*/
- yaffs_DeviceToCheckpointDevice(&cp,dev);
- cp.structType = sizeof(cp);
-
- ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
-
- /* Write block info */
- if(ok) {
- nBytes = nBlocks * sizeof(yaffs_BlockInfo);
- ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
- }
-
- /* Write chunk bits */
- if(ok) {
- nBytes = nBlocks * dev->chunkBitmapStride;
- ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
- }
- return ok ? 1 : 0;
-
-}
-
-static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
-{
- yaffs_CheckpointDevice cp;
- __u32 nBytes;
- __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
-
- int ok;
-
- ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
- if(!ok)
- return 0;
-
- if(cp.structType != sizeof(cp))
- return 0;
-
-
- yaffs_CheckpointDeviceToDevice(dev,&cp);
-
- nBytes = nBlocks * sizeof(yaffs_BlockInfo);
-
- ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
-
- if(!ok)
- return 0;
- nBytes = nBlocks * dev->chunkBitmapStride;
-
- ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
-
- return ok ? 1 : 0;
-}
-
-static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
- yaffs_Object *obj)
-{
-
- cp->objectId = obj->objectId;
- cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
- cp->chunkId = obj->chunkId;
- cp->variantType = obj->variantType;
- cp->deleted = obj->deleted;
- cp->softDeleted = obj->softDeleted;
- cp->unlinked = obj->unlinked;
- cp->fake = obj->fake;
- cp->renameAllowed = obj->renameAllowed;
- cp->unlinkAllowed = obj->unlinkAllowed;
- cp->serial = obj->serial;
- cp->nDataChunks = obj->nDataChunks;
-
- if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
- cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
- else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
- cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
-}
-
-static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
-{
-
- yaffs_Object *parent;
-
- obj->objectId = cp->objectId;
-
- if(cp->parentId)
- parent = yaffs_FindOrCreateObjectByNumber(
- obj->myDev,
- cp->parentId,
- YAFFS_OBJECT_TYPE_DIRECTORY);
- else
- parent = NULL;
-
- if(parent)
- yaffs_AddObjectToDirectory(parent, obj);
-
- obj->chunkId = cp->chunkId;
- obj->variantType = cp->variantType;
- obj->deleted = cp->deleted;
- obj->softDeleted = cp->softDeleted;
- obj->unlinked = cp->unlinked;
- obj->fake = cp->fake;
- obj->renameAllowed = cp->renameAllowed;
- obj->unlinkAllowed = cp->unlinkAllowed;
- obj->serial = cp->serial;
- obj->nDataChunks = cp->nDataChunks;
-
- if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
- obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
- else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
- obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
-
- if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
- obj->lazyLoaded = 1;
-}
-
-
-
-static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
- __u32 level, int chunkOffset)
-{
- int i;
- yaffs_Device *dev = in->myDev;
- int ok = 1;
- int nTnodeBytes = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
-
- if (tn) {
- if (level > 0) {
-
- for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++){
- if (tn->internal[i]) {
- ok = yaffs_CheckpointTnodeWorker(in,
- tn->internal[i],
- level - 1,
- (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
- }
- }
- } else if (level == 0) {
- __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
- /* printf("write tnode at %d\n",baseOffset); */
- ok = (yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset)) == sizeof(baseOffset));
- if(ok)
- ok = (yaffs_CheckpointWrite(dev,tn,nTnodeBytes) == nTnodeBytes);
- }
- }
-
- return ok;
-
-}
-
-static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
-{
- __u32 endMarker = ~0;
- int ok = 1;
-
- if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
- ok = yaffs_CheckpointTnodeWorker(obj,
- obj->variant.fileVariant.top,
- obj->variant.fileVariant.topLevel,
- 0);
- if(ok)
- ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) ==
- sizeof(endMarker));
- }
-
- return ok ? 1 : 0;
-}
-
-static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
-{
- __u32 baseChunk;
- int ok = 1;
- yaffs_Device *dev = obj->myDev;
- yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
- yaffs_Tnode *tn;
- int nread = 0;
-
- ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
-
- while(ok && (~baseChunk)){
- nread++;
- /* Read level 0 tnode */
-
-
- /* printf("read tnode at %d\n",baseChunk); */
- tn = yaffs_GetTnodeRaw(dev);
- if(tn)
- ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) ==
- (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
- else
- ok = 0;
-
- if(tn && ok){
- ok = yaffs_AddOrFindLevel0Tnode(dev,
- fileStructPtr,
- baseChunk,
- tn) ? 1 : 0;
-
- }
-
- if(ok)
- ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
-
- }
-
- T(YAFFS_TRACE_CHECKPOINT,(
- TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
- nread,baseChunk,ok));
-
- return ok ? 1 : 0;
-}
-
-
-static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
-{
- yaffs_Object *obj;
- yaffs_CheckpointObject cp;
- int i;
- int ok = 1;
- struct list_head *lh;
-
-
- /* Iterate through the objects in each hash entry,
- * dumping them to the checkpointing stream.
- */
-
- for(i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++){
- list_for_each(lh, &dev->objectBucket[i].list) {
- if (lh) {
- obj = list_entry(lh, yaffs_Object, hashLink);
- if (!obj->deferedFree) {
- yaffs_ObjectToCheckpointObject(&cp,obj);
- cp.structType = sizeof(cp);
-
- T(YAFFS_TRACE_CHECKPOINT,(
- TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
- cp.objectId,cp.parentId,cp.variantType,cp.chunkId,(unsigned) obj));
-
- ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
-
- if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
- ok = yaffs_WriteCheckpointTnodes(obj);
- }
- }
- }
- }
- }
-
- /* Dump end of list */
- memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
- cp.structType = sizeof(cp);
-
- if(ok)
- ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
-
- return ok ? 1 : 0;
-}
-
-static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
-{
- yaffs_Object *obj;
- yaffs_CheckpointObject cp;
- int ok = 1;
- int done = 0;
- yaffs_Object *hardList = NULL;
-
- while(ok && !done) {
- ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
- if(cp.structType != sizeof(cp)) {
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("struct size %d instead of %d ok %d"TENDSTR),
- cp.structType,sizeof(cp),ok));
- ok = 0;
- }
-
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
- cp.objectId,cp.parentId,cp.variantType,cp.chunkId));
-
- if(ok && cp.objectId == ~0)
- done = 1;
- else if(ok){
- obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
- if(obj) {
- yaffs_CheckpointObjectToObject(obj,&cp);
- if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
- ok = yaffs_ReadCheckpointTnodes(obj);
- } else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
- obj->hardLinks.next =
- (struct list_head *)
- hardList;
- hardList = obj;
- }
-
- }
- }
- }
-
- if(ok)
- yaffs_HardlinkFixup(dev,hardList);
-
- return ok ? 1 : 0;
-}
-
-static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
-{
- __u32 checkpointSum;
- int ok;
-
- yaffs_GetCheckpointSum(dev,&checkpointSum);
-
- ok = (yaffs_CheckpointWrite(dev,&checkpointSum,sizeof(checkpointSum)) == sizeof(checkpointSum));
-
- if(!ok)
- return 0;
-
- return 1;
-}
-
-static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
-{
- __u32 checkpointSum0;
- __u32 checkpointSum1;
- int ok;
-
- yaffs_GetCheckpointSum(dev,&checkpointSum0);
-
- ok = (yaffs_CheckpointRead(dev,&checkpointSum1,sizeof(checkpointSum1)) == sizeof(checkpointSum1));
-
- if(!ok)
- return 0;
-
- if(checkpointSum0 != checkpointSum1)
- return 0;
-
- return 1;
-}
-
-
-static int yaffs_WriteCheckpointData(yaffs_Device *dev)
-{
-
- int ok = 1;
-
- if(dev->skipCheckpointWrite || !dev->isYaffs2){
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint write" TENDSTR)));
- ok = 0;
- }
-
- if(ok)
- ok = yaffs_CheckpointOpen(dev,1);
-
- if(ok){
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
- ok = yaffs_WriteCheckpointValidityMarker(dev,1);
- }
- if(ok){
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint device" TENDSTR)));
- ok = yaffs_WriteCheckpointDevice(dev);
- }
- if(ok){
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint objects" TENDSTR)));
- ok = yaffs_WriteCheckpointObjects(dev);
- }
- if(ok){
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("write checkpoint validity" TENDSTR)));
- ok = yaffs_WriteCheckpointValidityMarker(dev,0);
- }
-
- if(ok){
- ok = yaffs_WriteCheckpointSum(dev);
- }
-
-
- if(!yaffs_CheckpointClose(dev))
- ok = 0;
-
- if(ok)
- dev->isCheckpointed = 1;
- else
- dev->isCheckpointed = 0;
-
- return dev->isCheckpointed;
-}
-
-static int yaffs_ReadCheckpointData(yaffs_Device *dev)
-{
- int ok = 1;
-
- if(dev->skipCheckpointRead || !dev->isYaffs2){
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("skipping checkpoint read" TENDSTR)));
- ok = 0;
- }
-
- if(ok)
- ok = yaffs_CheckpointOpen(dev,0); /* open for read */
-
- if(ok){
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
- ok = yaffs_ReadCheckpointValidityMarker(dev,1);
- }
- if(ok){
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint device" TENDSTR)));
- ok = yaffs_ReadCheckpointDevice(dev);
- }
- if(ok){
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint objects" TENDSTR)));
- ok = yaffs_ReadCheckpointObjects(dev);
- }
- if(ok){
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint validity" TENDSTR)));
- ok = yaffs_ReadCheckpointValidityMarker(dev,0);
- }
-
- if(ok){
- ok = yaffs_ReadCheckpointSum(dev);
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("read checkpoint checksum %d" TENDSTR),ok));
- }
-
- if(!yaffs_CheckpointClose(dev))
- ok = 0;
-
- if(ok)
- dev->isCheckpointed = 1;
- else
- dev->isCheckpointed = 0;
-
- return ok ? 1 : 0;
-
-}
-
-static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
-{
- if(dev->isCheckpointed ||
- dev->blocksInCheckpoint > 0){
- dev->isCheckpointed = 0;
- yaffs_CheckpointInvalidateStream(dev);
- if(dev->superBlock && dev->markSuperBlockDirty)
- dev->markSuperBlockDirty(dev->superBlock);
- }
-}
-
-
-int yaffs_CheckpointSave(yaffs_Device *dev)
-{
-
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("save entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
-
- yaffs_VerifyObjects(dev);
- yaffs_VerifyBlocks(dev);
- yaffs_VerifyFreeChunks(dev);
-
- if(!dev->isCheckpointed) {
- yaffs_InvalidateCheckpoint(dev);
- yaffs_WriteCheckpointData(dev);
- }
-
- T(YAFFS_TRACE_ALWAYS,(TSTR("save exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
-
- return dev->isCheckpointed;
-}
-
-int yaffs_CheckpointRestore(yaffs_Device *dev)
-{
- int retval;
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore entry: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
-
- retval = yaffs_ReadCheckpointData(dev);
-
- if(dev->isCheckpointed){
- yaffs_VerifyObjects(dev);
- yaffs_VerifyBlocks(dev);
- yaffs_VerifyFreeChunks(dev);
- }
-
- T(YAFFS_TRACE_CHECKPOINT,(TSTR("restore exit: isCheckpointed %d"TENDSTR),dev->isCheckpointed));
-
- return retval;
-}
-
-/*--------------------- File read/write ------------------------
- * Read and write have very similar structures.
- * In general the read/write has three parts to it
- * An incomplete chunk to start with (if the read/write is not chunk-aligned)
- * Some complete chunks
- * An incomplete chunk to end off with
- *
- * Curve-balls: the first chunk might also be the last chunk.
- */
-
-int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, loff_t offset,
- int nBytes)
-{
-
- int chunk;
- int start;
- int nToCopy;
- int n = nBytes;
- int nDone = 0;
- yaffs_ChunkCache *cache;
-
- yaffs_Device *dev;
-
- dev = in->myDev;
-
- while (n > 0) {
- //chunk = offset / dev->nDataBytesPerChunk + 1;
- //start = offset % dev->nDataBytesPerChunk;
- yaffs_AddrToChunk(dev,offset,&chunk,&start);
- chunk++;
-
- /* OK now check for the curveball where the start and end are in
- * the same chunk.
- */
- if ((start + n) < dev->nDataBytesPerChunk) {
- nToCopy = n;
- } else {
- nToCopy = dev->nDataBytesPerChunk - start;
- }
-
- cache = yaffs_FindChunkCache(in, chunk);
-
- /* If the chunk is already in the cache or it is less than a whole chunk
- * then use the cache (if there is caching)
- * else bypass the cache.
- */
- if (cache || nToCopy != dev->nDataBytesPerChunk) {
- if (dev->nShortOpCaches > 0) {
-
- /* If we can't find the data in the cache, then load it up. */
-
- if (!cache) {
- cache = yaffs_GrabChunkCache(in->myDev);
- cache->object = in;
- cache->chunkId = chunk;
- cache->dirty = 0;
- cache->locked = 0;
- yaffs_ReadChunkDataFromObject(in, chunk,
- cache->
- data);
- cache->nBytes = 0;
- }
-
- yaffs_UseChunkCache(dev, cache, 0);
-
- cache->locked = 1;
-
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_UnlockYAFFS(TRUE);
-#endif
- memcpy(buffer, &cache->data[start], nToCopy);
-
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_LockYAFFS(TRUE);
-#endif
- cache->locked = 0;
- } else {
- /* Read into the local buffer then copy..*/
-
- __u8 *localBuffer =
- yaffs_GetTempBuffer(dev, __LINE__);
- yaffs_ReadChunkDataFromObject(in, chunk,
- localBuffer);
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_UnlockYAFFS(TRUE);
-#endif
- memcpy(buffer, &localBuffer[start], nToCopy);
-
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_LockYAFFS(TRUE);
-#endif
- yaffs_ReleaseTempBuffer(dev, localBuffer,
- __LINE__);
- }
-
- } else {
-#ifdef CONFIG_YAFFS_WINCE
- __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
-
- /* Under WinCE can't do direct transfer. Need to use a local buffer.
- * This is because we otherwise screw up WinCE's memory mapper
- */
- yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
-
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_UnlockYAFFS(TRUE);
-#endif
- memcpy(buffer, localBuffer, dev->nDataBytesPerChunk);
-
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_LockYAFFS(TRUE);
- yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
-#endif
-
-#else
- /* A full chunk. Read directly into the supplied buffer. */
- yaffs_ReadChunkDataFromObject(in, chunk, buffer);
-#endif
- }
-
- n -= nToCopy;
- offset += nToCopy;
- buffer += nToCopy;
- nDone += nToCopy;
-
- }
-
- return nDone;
-}
-
-int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, loff_t offset,
- int nBytes, int writeThrough)
-{
-
- int chunk;
- int start;
- int nToCopy;
- int n = nBytes;
- int nDone = 0;
- int nToWriteBack;
- int startOfWrite = offset;
- int chunkWritten = 0;
- int nBytesRead;
-
- yaffs_Device *dev;
-
- dev = in->myDev;
-
- while (n > 0 && chunkWritten >= 0) {
- //chunk = offset / dev->nDataBytesPerChunk + 1;
- //start = offset % dev->nDataBytesPerChunk;
- yaffs_AddrToChunk(dev,offset,&chunk,&start);
- chunk++;
-
- /* OK now check for the curveball where the start and end are in
- * the same chunk.
- */
-
- if ((start + n) < dev->nDataBytesPerChunk) {
- nToCopy = n;
-
- /* Now folks, to calculate how many bytes to write back....
- * If we're overwriting and not writing to then end of file then
- * we need to write back as much as was there before.
- */
-
- nBytesRead =
- in->variant.fileVariant.fileSize -
- ((chunk - 1) * dev->nDataBytesPerChunk);
-
- if (nBytesRead > dev->nDataBytesPerChunk) {
- nBytesRead = dev->nDataBytesPerChunk;
- }
-
- nToWriteBack =
- (nBytesRead >
- (start + n)) ? nBytesRead : (start + n);
-
- } else {
- nToCopy = dev->nDataBytesPerChunk - start;
- nToWriteBack = dev->nDataBytesPerChunk;
- }
-
- if (nToCopy != dev->nDataBytesPerChunk) {
- /* An incomplete start or end chunk (or maybe both start and end chunk) */
- if (dev->nShortOpCaches > 0) {
- yaffs_ChunkCache *cache;
- /* If we can't find the data in the cache, then load the cache */
- cache = yaffs_FindChunkCache(in, chunk);
-
- if (!cache
- && yaffs_CheckSpaceForAllocation(in->
- myDev)) {
- cache = yaffs_GrabChunkCache(in->myDev);
- cache->object = in;
- cache->chunkId = chunk;
- cache->dirty = 0;
- cache->locked = 0;
- yaffs_ReadChunkDataFromObject(in, chunk,
- cache->
- data);
- }
- else if(cache &&
- !cache->dirty &&
- !yaffs_CheckSpaceForAllocation(in->myDev)){
- /* Drop the cache if it was a read cache item and
- * no space check has been made for it.
- */
- cache = NULL;
- }
-
- if (cache) {
- yaffs_UseChunkCache(dev, cache, 1);
- cache->locked = 1;
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_UnlockYAFFS(TRUE);
-#endif
-
- memcpy(&cache->data[start], buffer,
- nToCopy);
-
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_LockYAFFS(TRUE);
-#endif
- cache->locked = 0;
- cache->nBytes = nToWriteBack;
-
- if (writeThrough) {
- chunkWritten =
- yaffs_WriteChunkDataToObject
- (cache->object,
- cache->chunkId,
- cache->data, cache->nBytes,
- 1);
- cache->dirty = 0;
- }
-
- } else {
- chunkWritten = -1; /* fail the write */
- }
- } else {
- /* An incomplete start or end chunk (or maybe both start and end chunk)
- * Read into the local buffer then copy, then copy over and write back.
- */
-
- __u8 *localBuffer =
- yaffs_GetTempBuffer(dev, __LINE__);
-
- yaffs_ReadChunkDataFromObject(in, chunk,
- localBuffer);
-
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_UnlockYAFFS(TRUE);
-#endif
-
- memcpy(&localBuffer[start], buffer, nToCopy);
-
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_LockYAFFS(TRUE);
-#endif
- chunkWritten =
- yaffs_WriteChunkDataToObject(in, chunk,
- localBuffer,
- nToWriteBack,
- 0);
-
- yaffs_ReleaseTempBuffer(dev, localBuffer,
- __LINE__);
-
- }
-
- } else {
-
-#ifdef CONFIG_YAFFS_WINCE
- /* Under WinCE can't do direct transfer. Need to use a local buffer.
- * This is because we otherwise screw up WinCE's memory mapper
- */
- __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_UnlockYAFFS(TRUE);
-#endif
- memcpy(localBuffer, buffer, dev->nDataBytesPerChunk);
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_LockYAFFS(TRUE);
-#endif
- chunkWritten =
- yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
- dev->nDataBytesPerChunk,
- 0);
- yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
-#else
- /* A full chunk. Write directly from the supplied buffer. */
- chunkWritten =
- yaffs_WriteChunkDataToObject(in, chunk, buffer,
- dev->nDataBytesPerChunk,
- 0);
-#endif
- /* Since we've overwritten the cached data, we better invalidate it. */
- yaffs_InvalidateChunkCache(in, chunk);
- }
-
- if (chunkWritten >= 0) {
- n -= nToCopy;
- offset += nToCopy;
- buffer += nToCopy;
- nDone += nToCopy;
- }
-
- }
-
- /* Update file object */
-
- if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
- in->variant.fileVariant.fileSize = (startOfWrite + nDone);
- }
-
- in->dirty = 1;
-
- return nDone;
-}
-
-
-/* ---------------------- File resizing stuff ------------------ */
-
-static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
-{
-
- yaffs_Device *dev = in->myDev;
- int oldFileSize = in->variant.fileVariant.fileSize;
-
- int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
-
- int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
- dev->nDataBytesPerChunk;
- int i;
- int chunkId;
-
- /* Delete backwards so that we don't end up with holes if
- * power is lost part-way through the operation.
- */
- for (i = lastDel; i >= startDel; i--) {
- /* NB this could be optimised somewhat,
- * eg. could retrieve the tags and write them without
- * using yaffs_DeleteChunk
- */
-
- chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
- if (chunkId > 0) {
- if (chunkId <
- (dev->internalStartBlock * dev->nChunksPerBlock)
- || chunkId >=
- ((dev->internalEndBlock +
- 1) * dev->nChunksPerBlock)) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR("Found daft chunkId %d for %d" TENDSTR),
- chunkId, i));
- } else {
- in->nDataChunks--;
- yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
- }
- }
- }
-
-}
-
-int yaffs_ResizeFile(yaffs_Object * in, loff_t newSize)
-{
-
- int oldFileSize = in->variant.fileVariant.fileSize;
- int newSizeOfPartialChunk;
- int newFullChunks;
-
- yaffs_Device *dev = in->myDev;
-
- yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
-
- yaffs_FlushFilesChunkCache(in);
- yaffs_InvalidateWholeChunkCache(in);
-
- yaffs_CheckGarbageCollection(dev);
-
- if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
- return yaffs_GetFileSize(in);
- }
-
- if (newSize == oldFileSize) {
- return oldFileSize;
- }
-
- if (newSize < oldFileSize) {
-
- yaffs_PruneResizedChunks(in, newSize);
-
- if (newSizeOfPartialChunk != 0) {
- int lastChunk = 1 + newFullChunks;
-
- __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
-
- /* Got to read and rewrite the last chunk with its new size and zero pad */
- yaffs_ReadChunkDataFromObject(in, lastChunk,
- localBuffer);
-
- memset(localBuffer + newSizeOfPartialChunk, 0,
- dev->nDataBytesPerChunk - newSizeOfPartialChunk);
-
- yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
- newSizeOfPartialChunk, 1);
-
- yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
- }
-
- in->variant.fileVariant.fileSize = newSize;
-
- yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
- } else {
- /* newsSize > oldFileSize */
- in->variant.fileVariant.fileSize = newSize;
- }
-
-
-
- /* Write a new object header.
- * show we've shrunk the file, if need be
- * Do this only if the file is not in the deleted directories.
- */
- if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
- in->parent->objectId != YAFFS_OBJECTID_DELETED) {
- yaffs_UpdateObjectHeader(in, NULL, 0,
- (newSize < oldFileSize) ? 1 : 0, 0);
- }
-
- return newSize;
-}
-
-loff_t yaffs_GetFileSize(yaffs_Object * obj)
-{
- obj = yaffs_GetEquivalentObject(obj);
-
- switch (obj->variantType) {
- case YAFFS_OBJECT_TYPE_FILE:
- return obj->variant.fileVariant.fileSize;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- return yaffs_strlen(obj->variant.symLinkVariant.alias);
- default:
- return 0;
- }
-}
-
-
-
-int yaffs_FlushFile(yaffs_Object * in, int updateTime)
-{
- int retVal;
- if (in->dirty) {
- yaffs_FlushFilesChunkCache(in);
- if (updateTime) {
-#ifdef CONFIG_YAFFS_WINCE
- yfsd_WinFileTimeNow(in->win_mtime);
-#else
-
- in->yst_mtime = Y_CURRENT_TIME;
-
-#endif
- }
-
- retVal =
- (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
- 0) ? YAFFS_OK : YAFFS_FAIL;
- } else {
- retVal = YAFFS_OK;
- }
-
- return retVal;
-
-}
-
-static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
-{
-
- /* First off, invalidate the file's data in the cache, without flushing. */
- yaffs_InvalidateWholeChunkCache(in);
-
- if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
- /* Move to the unlinked directory so we have a record that it was deleted. */
- yaffs_ChangeObjectName(in, in->myDev->deletedDir,"deleted", 0, 0);
-
- }
-
- yaffs_RemoveObjectFromDirectory(in);
- yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
- in->chunkId = -1;
-
- yaffs_FreeObject(in);
- return YAFFS_OK;
-
-}
-
-/* yaffs_DeleteFile deletes the whole file data
- * and the inode associated with the file.
- * It does not delete the links associated with the file.
- */
-static int yaffs_UnlinkFile(yaffs_Object * in)
-{
-
- int retVal;
- int immediateDeletion = 0;
-
- if (1) {
-#ifdef __KERNEL__
- if (!in->myInode) {
- immediateDeletion = 1;
-
- }
-#else
- if (in->inUse <= 0) {
- immediateDeletion = 1;
-
- }
-#endif
- if (immediateDeletion) {
- retVal =
- yaffs_ChangeObjectName(in, in->myDev->deletedDir,
- "deleted", 0, 0);
- T(YAFFS_TRACE_TRACING,
- (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
- in->objectId));
- in->deleted = 1;
- in->myDev->nDeletedFiles++;
- if (0 && in->myDev->isYaffs2) {
- yaffs_ResizeFile(in, 0);
- }
- yaffs_SoftDeleteFile(in);
- } else {
- retVal =
- yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
- "unlinked", 0, 0);
- }
-
- }
- return retVal;
-}
-
-int yaffs_DeleteFile(yaffs_Object * in)
-{
- int retVal = YAFFS_OK;
-
- if (in->nDataChunks > 0) {
- /* Use soft deletion if there is data in the file */
- if (!in->unlinked) {
- retVal = yaffs_UnlinkFile(in);
- }
- if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
- in->deleted = 1;
- in->myDev->nDeletedFiles++;
- yaffs_SoftDeleteFile(in);
- }
- return in->deleted ? YAFFS_OK : YAFFS_FAIL;
- } else {
- /* The file has no data chunks so we toss it immediately */
- yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
- in->variant.fileVariant.top = NULL;
- yaffs_DoGenericObjectDeletion(in);
-
- return YAFFS_OK;
- }
-}
-
-static int yaffs_DeleteDirectory(yaffs_Object * in)
-{
- /* First check that the directory is empty. */
- if (list_empty(&in->variant.directoryVariant.children)) {
- return yaffs_DoGenericObjectDeletion(in);
- }
-
- return YAFFS_FAIL;
-
-}
-
-static int yaffs_DeleteSymLink(yaffs_Object * in)
-{
- YFREE(in->variant.symLinkVariant.alias);
-
- return yaffs_DoGenericObjectDeletion(in);
-}
-
-static int yaffs_DeleteHardLink(yaffs_Object * in)
-{
- /* remove this hardlink from the list assocaited with the equivalent
- * object
- */
- list_del(&in->hardLinks);
- return yaffs_DoGenericObjectDeletion(in);
-}
-
-static void yaffs_DestroyObject(yaffs_Object * obj)
-{
- switch (obj->variantType) {
- case YAFFS_OBJECT_TYPE_FILE:
- yaffs_DeleteFile(obj);
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- yaffs_DeleteDirectory(obj);
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- yaffs_DeleteSymLink(obj);
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- yaffs_DeleteHardLink(obj);
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- yaffs_DoGenericObjectDeletion(obj);
- break;
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- break; /* should not happen. */
- }
-}
-
-static int yaffs_UnlinkWorker(yaffs_Object * obj)
-{
-
- if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
- return yaffs_DeleteHardLink(obj);
- } else if (!list_empty(&obj->hardLinks)) {
- /* Curve ball: We're unlinking an object that has a hardlink.
- *
- * This problem arises because we are not strictly following
- * The Linux link/inode model.
- *
- * We can't really delete the object.
- * Instead, we do the following:
- * - Select a hardlink.
- * - Unhook it from the hard links
- * - Unhook it from its parent directory (so that the rename can work)
- * - Rename the object to the hardlink's name.
- * - Delete the hardlink
- */
-
- yaffs_Object *hl;
- int retVal;
- YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
-
- hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
-
- list_del_init(&hl->hardLinks);
- list_del_init(&hl->siblings);
-
- yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
-
- retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
-
- if (retVal == YAFFS_OK) {
- retVal = yaffs_DoGenericObjectDeletion(hl);
- }
- return retVal;
-
- } else {
- switch (obj->variantType) {
- case YAFFS_OBJECT_TYPE_FILE:
- return yaffs_UnlinkFile(obj);
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- return yaffs_DeleteDirectory(obj);
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- return yaffs_DeleteSymLink(obj);
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- return yaffs_DoGenericObjectDeletion(obj);
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- default:
- return YAFFS_FAIL;
- }
- }
-}
-
-
-static int yaffs_UnlinkObject( yaffs_Object *obj)
-{
-
- if (obj && obj->unlinkAllowed) {
- return yaffs_UnlinkWorker(obj);
- }
-
- return YAFFS_FAIL;
-
-}
-int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
-{
- yaffs_Object *obj;
-
- obj = yaffs_FindObjectByName(dir, name);
- return yaffs_UnlinkObject(obj);
-}
-
-/*----------------------- Initialisation Scanning ---------------------- */
-
-static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
- int backwardScanning)
-{
- yaffs_Object *obj;
-
- if (!backwardScanning) {
- /* Handle YAFFS1 forward scanning case
- * For YAFFS1 we always do the deletion
- */
-
- } else {
- /* Handle YAFFS2 case (backward scanning)
- * If the shadowed object exists then ignore.
- */
- if (yaffs_FindObjectByNumber(dev, objId)) {
- return;
- }
- }
-
- /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
- * We put it in unlinked dir to be cleaned up after the scanning
- */
- obj =
- yaffs_FindOrCreateObjectByNumber(dev, objId,
- YAFFS_OBJECT_TYPE_FILE);
- yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
- obj->variant.fileVariant.shrinkSize = 0;
- obj->valid = 1; /* So that we don't read any other info for this file */
-
-}
-
-typedef struct {
- int seq;
- int block;
-} yaffs_BlockIndex;
-
-
-static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
-{
- yaffs_Object *hl;
- yaffs_Object *in;
-
- while (hardList) {
- hl = hardList;
- hardList = (yaffs_Object *) (hardList->hardLinks.next);
-
- in = yaffs_FindObjectByNumber(dev,
- hl->variant.hardLinkVariant.
- equivalentObjectId);
-
- if (in) {
- /* Add the hardlink pointers */
- hl->variant.hardLinkVariant.equivalentObject = in;
- list_add(&hl->hardLinks, &in->hardLinks);
- } else {
- /* Todo Need to report/handle this better.
- * Got a problem... hardlink to a non-existant object
- */
- hl->variant.hardLinkVariant.equivalentObject = NULL;
- INIT_LIST_HEAD(&hl->hardLinks);
-
- }
-
- }
-
-}
-
-
-
-
-
-static int ybicmp(const void *a, const void *b){
- register int aseq = ((yaffs_BlockIndex *)a)->seq;
- register int bseq = ((yaffs_BlockIndex *)b)->seq;
- register int ablock = ((yaffs_BlockIndex *)a)->block;
- register int bblock = ((yaffs_BlockIndex *)b)->block;
- if( aseq == bseq )
- return ablock - bblock;
- else
- return aseq - bseq;
-
-}
-
-static int yaffs_Scan(yaffs_Device * dev)
-{
- yaffs_ExtendedTags tags;
- int blk;
- int blockIterator;
- int startIterator;
- int endIterator;
- int nBlocksToScan = 0;
- int result;
-
- int chunk;
- int c;
- int deleted;
- yaffs_BlockState state;
- yaffs_Object *hardList = NULL;
- yaffs_BlockInfo *bi;
- int sequenceNumber;
- yaffs_ObjectHeader *oh;
- yaffs_Object *in;
- yaffs_Object *parent;
- int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
-
- int alloc_failed = 0;
-
-
- __u8 *chunkData;
-
- yaffs_BlockIndex *blockIndex = NULL;
-
- if (dev->isYaffs2) {
- T(YAFFS_TRACE_SCAN,
- (TSTR("yaffs_Scan is not for YAFFS2!" TENDSTR)));
- return YAFFS_FAIL;
- }
-
- //TODO Throw all the yaffs2 stuuf out of yaffs_Scan since it is only for yaffs1 format.
-
- T(YAFFS_TRACE_SCAN,
- (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
- dev->internalStartBlock, dev->internalEndBlock));
-
- chunkData = yaffs_GetTempBuffer(dev, __LINE__);
-
- dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
-
- if (dev->isYaffs2) {
- blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
- if(!blockIndex)
- return YAFFS_FAIL;
- }
-
- /* Scan all the blocks to determine their state */
- for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
- bi = yaffs_GetBlockInfo(dev, blk);
- yaffs_ClearChunkBits(dev, blk);
- bi->pagesInUse = 0;
- bi->softDeletions = 0;
-
- yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
-
- bi->blockState = state;
- bi->sequenceNumber = sequenceNumber;
-
- T(YAFFS_TRACE_SCAN_DEBUG,
- (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
- state, sequenceNumber));
-
- if (state == YAFFS_BLOCK_STATE_DEAD) {
- T(YAFFS_TRACE_BAD_BLOCKS,
- (TSTR("block %d is bad" TENDSTR), blk));
- } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
- T(YAFFS_TRACE_SCAN_DEBUG,
- (TSTR("Block empty " TENDSTR)));
- dev->nErasedBlocks++;
- dev->nFreeChunks += dev->nChunksPerBlock;
- } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-
- /* Determine the highest sequence number */
- if (dev->isYaffs2 &&
- sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
- sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
-
- blockIndex[nBlocksToScan].seq = sequenceNumber;
- blockIndex[nBlocksToScan].block = blk;
-
- nBlocksToScan++;
-
- if (sequenceNumber >= dev->sequenceNumber) {
- dev->sequenceNumber = sequenceNumber;
- }
- } else if (dev->isYaffs2) {
- /* TODO: Nasty sequence number! */
- T(YAFFS_TRACE_SCAN,
- (TSTR
- ("Block scanning block %d has bad sequence number %d"
- TENDSTR), blk, sequenceNumber));
-
- }
- }
- }
-
- /* Sort the blocks
- * Dungy old bubble sort for now...
- */
- if (dev->isYaffs2) {
- yaffs_BlockIndex temp;
- int i;
- int j;
-
- for (i = 0; i < nBlocksToScan; i++)
- for (j = i + 1; j < nBlocksToScan; j++)
- if (blockIndex[i].seq > blockIndex[j].seq) {
- temp = blockIndex[j];
- blockIndex[j] = blockIndex[i];
- blockIndex[i] = temp;
- }
- }
-
- /* Now scan the blocks looking at the data. */
- if (dev->isYaffs2) {
- startIterator = 0;
- endIterator = nBlocksToScan - 1;
- T(YAFFS_TRACE_SCAN_DEBUG,
- (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
- } else {
- startIterator = dev->internalStartBlock;
- endIterator = dev->internalEndBlock;
- }
-
- /* For each block.... */
- for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
- blockIterator++) {
-
- if (dev->isYaffs2) {
- /* get the block to scan in the correct order */
- blk = blockIndex[blockIterator].block;
- } else {
- blk = blockIterator;
- }
-
- bi = yaffs_GetBlockInfo(dev, blk);
- state = bi->blockState;
-
- deleted = 0;
-
- /* For each chunk in each block that needs scanning....*/
- for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
- state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
- /* Read the tags and decide what to do */
- chunk = blk * dev->nChunksPerBlock + c;
-
- result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
- &tags);
-
- /* Let's have a good look at this chunk... */
-
- if (!dev->isYaffs2 && tags.chunkDeleted) {
- /* YAFFS1 only...
- * A deleted chunk
- */
- deleted++;
- dev->nFreeChunks++;
- /*T((" %d %d deleted\n",blk,c)); */
- } else if (!tags.chunkUsed) {
- /* An unassigned chunk in the block
- * This means that either the block is empty or
- * this is the one being allocated from
- */
-
- if (c == 0) {
- /* We're looking at the first chunk in the block so the block is unused */
- state = YAFFS_BLOCK_STATE_EMPTY;
- dev->nErasedBlocks++;
- } else {
- /* this is the block being allocated from */
- T(YAFFS_TRACE_SCAN,
- (TSTR
- (" Allocating from %d %d" TENDSTR),
- blk, c));
- state = YAFFS_BLOCK_STATE_ALLOCATING;
- dev->allocationBlock = blk;
- dev->allocationPage = c;
- dev->allocationBlockFinder = blk;
- /* Set it to here to encourage the allocator to go forth from here. */
-
- /* Yaffs2 sanity check:
- * This should be the one with the highest sequence number
- */
- if (dev->isYaffs2
- && (dev->sequenceNumber !=
- bi->sequenceNumber)) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("yaffs: Allocation block %d was not highest sequence id:"
- " block seq = %d, dev seq = %d"
- TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
- }
- }
-
- dev->nFreeChunks += (dev->nChunksPerBlock - c);
- } else if (tags.chunkId > 0) {
- /* chunkId > 0 so it is a data chunk... */
- unsigned int endpos;
-
- yaffs_SetChunkBit(dev, blk, c);
- bi->pagesInUse++;
-
- in = yaffs_FindOrCreateObjectByNumber(dev,
- tags.
- objectId,
- YAFFS_OBJECT_TYPE_FILE);
- /* PutChunkIntoFile checks for a clash (two data chunks with
- * the same chunkId).
- */
-
- if(!in)
- alloc_failed = 1;
-
- if(in){
- if(!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,1))
- alloc_failed = 1;
- }
-
- endpos =
- (tags.chunkId - 1) * dev->nDataBytesPerChunk +
- tags.byteCount;
- if (in &&
- in->variantType == YAFFS_OBJECT_TYPE_FILE
- && in->variant.fileVariant.scannedFileSize <
- endpos) {
- in->variant.fileVariant.
- scannedFileSize = endpos;
- if (!dev->useHeaderFileSize) {
- in->variant.fileVariant.
- fileSize =
- in->variant.fileVariant.
- scannedFileSize;
- }
-
- }
- /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
- } else {
- /* chunkId == 0, so it is an ObjectHeader.
- * Thus, we read in the object header and make the object
- */
- yaffs_SetChunkBit(dev, blk, c);
- bi->pagesInUse++;
-
- result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
- chunkData,
- NULL);
-
- oh = (yaffs_ObjectHeader *) chunkData;
-
- in = yaffs_FindObjectByNumber(dev,
- tags.objectId);
- if (in && in->variantType != oh->type) {
- /* This should not happen, but somehow
- * Wev'e ended up with an objectId that has been reused but not yet
- * deleted, and worse still it has changed type. Delete the old object.
- */
-
- yaffs_DestroyObject(in);
-
- in = 0;
- }
-
- in = yaffs_FindOrCreateObjectByNumber(dev,
- tags.
- objectId,
- oh->type);
-
- if(!in)
- alloc_failed = 1;
-
- if (in && oh->shadowsObject > 0) {
- yaffs_HandleShadowedObject(dev,
- oh->
- shadowsObject,
- 0);
- }
-
- if (in && in->valid) {
- /* We have already filled this one. We have a duplicate and need to resolve it. */
-
- unsigned existingSerial = in->serial;
- unsigned newSerial = tags.serialNumber;
-
- if (dev->isYaffs2 ||
- ((existingSerial + 1) & 3) ==
- newSerial) {
- /* Use new one - destroy the exisiting one */
- yaffs_DeleteChunk(dev,
- in->chunkId,
- 1, __LINE__);
- in->valid = 0;
- } else {
- /* Use existing - destroy this one. */
- yaffs_DeleteChunk(dev, chunk, 1,
- __LINE__);
- }
- }
-
- if (in && !in->valid &&
- (tags.objectId == YAFFS_OBJECTID_ROOT ||
- tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
- /* We only load some info, don't fiddle with directory structure */
- in->valid = 1;
- in->variantType = oh->type;
-
- in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
- in->win_atime[0] = oh->win_atime[0];
- in->win_ctime[0] = oh->win_ctime[0];
- in->win_mtime[0] = oh->win_mtime[0];
- in->win_atime[1] = oh->win_atime[1];
- in->win_ctime[1] = oh->win_ctime[1];
- in->win_mtime[1] = oh->win_mtime[1];
-#else
- in->yst_uid = oh->yst_uid;
- in->yst_gid = oh->yst_gid;
- in->yst_atime = oh->yst_atime;
- in->yst_mtime = oh->yst_mtime;
- in->yst_ctime = oh->yst_ctime;
- in->yst_rdev = oh->yst_rdev;
-#endif
- in->chunkId = chunk;
-
- } else if (in && !in->valid) {
- /* we need to load this info */
-
- in->valid = 1;
- in->variantType = oh->type;
-
- in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
- in->win_atime[0] = oh->win_atime[0];
- in->win_ctime[0] = oh->win_ctime[0];
- in->win_mtime[0] = oh->win_mtime[0];
- in->win_atime[1] = oh->win_atime[1];
- in->win_ctime[1] = oh->win_ctime[1];
- in->win_mtime[1] = oh->win_mtime[1];
-#else
- in->yst_uid = oh->yst_uid;
- in->yst_gid = oh->yst_gid;
- in->yst_atime = oh->yst_atime;
- in->yst_mtime = oh->yst_mtime;
- in->yst_ctime = oh->yst_ctime;
- in->yst_rdev = oh->yst_rdev;
-#endif
- in->chunkId = chunk;
-
- yaffs_SetObjectName(in, oh->name);
- in->dirty = 0;
-
- /* directory stuff...
- * hook up to parent
- */
-
- parent =
- yaffs_FindOrCreateObjectByNumber
- (dev, oh->parentObjectId,
- YAFFS_OBJECT_TYPE_DIRECTORY);
- if (parent->variantType ==
- YAFFS_OBJECT_TYPE_UNKNOWN) {
- /* Set up as a directory */
- parent->variantType =
- YAFFS_OBJECT_TYPE_DIRECTORY;
- INIT_LIST_HEAD(&parent->variant.
- directoryVariant.
- children);
- } else if (parent->variantType !=
- YAFFS_OBJECT_TYPE_DIRECTORY)
- {
- /* Hoosterman, another problem....
- * We're trying to use a non-directory as a directory
- */
-
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("yaffs tragedy: attempting to use non-directory as"
- " a directory in scan. Put in lost+found."
- TENDSTR)));
- parent = dev->lostNFoundDir;
- }
-
- yaffs_AddObjectToDirectory(parent, in);
-
- if (0 && (parent == dev->deletedDir ||
- parent == dev->unlinkedDir)) {
- in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
- dev->nDeletedFiles++;
- }
- /* Note re hardlinks.
- * Since we might scan a hardlink before its equivalent object is scanned
- * we put them all in a list.
- * After scanning is complete, we should have all the objects, so we run through this
- * list and fix up all the chains.
- */
-
- switch (in->variantType) {
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- /* Todo got a problem */
- break;
- case YAFFS_OBJECT_TYPE_FILE:
- if (dev->isYaffs2
- && oh->isShrink) {
- /* Prune back the shrunken chunks */
- yaffs_PruneResizedChunks
- (in, oh->fileSize);
- /* Mark the block as having a shrinkHeader */
- bi->hasShrinkHeader = 1;
- }
-
- if (dev->useHeaderFileSize)
-
- in->variant.fileVariant.
- fileSize =
- oh->fileSize;
-
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- in->variant.hardLinkVariant.
- equivalentObjectId =
- oh->equivalentObjectId;
- in->hardLinks.next =
- (struct list_head *)
- hardList;
- hardList = in;
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- /* Do nothing */
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- /* Do nothing */
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- in->variant.symLinkVariant.alias =
- yaffs_CloneString(oh->alias);
- if(!in->variant.symLinkVariant.alias)
- alloc_failed = 1;
- break;
- }
-
- if (parent == dev->deletedDir) {
- yaffs_DestroyObject(in);
- bi->hasShrinkHeader = 1;
- }
- }
- }
- }
-
- if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
- /* If we got this far while scanning, then the block is fully allocated.*/
- state = YAFFS_BLOCK_STATE_FULL;
- }
-
- bi->blockState = state;
-
- /* Now let's see if it was dirty */
- if (bi->pagesInUse == 0 &&
- !bi->hasShrinkHeader &&
- bi->blockState == YAFFS_BLOCK_STATE_FULL) {
- yaffs_BlockBecameDirty(dev, blk);
- }
-
- }
-
- if (blockIndex) {
- YFREE(blockIndex);
- }
-
-
- /* Ok, we've done all the scanning.
- * Fix up the hard link chains.
- * We should now have scanned all the objects, now it's time to add these
- * hardlinks.
- */
-
- yaffs_HardlinkFixup(dev,hardList);
-
- /* Handle the unlinked files. Since they were left in an unlinked state we should
- * just delete them.
- */
- {
- struct list_head *i;
- struct list_head *n;
-
- yaffs_Object *l;
- /* Soft delete all the unlinked files */
- list_for_each_safe(i, n,
- &dev->unlinkedDir->variant.directoryVariant.
- children) {
- if (i) {
- l = list_entry(i, yaffs_Object, siblings);
- yaffs_DestroyObject(l);
- }
- }
- }
-
- yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
-
- if(alloc_failed){
- return YAFFS_FAIL;
- }
-
- T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
-
-
- return YAFFS_OK;
-}
-
-static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
-{
- __u8 *chunkData;
- yaffs_ObjectHeader *oh;
- yaffs_Device *dev = in->myDev;
- yaffs_ExtendedTags tags;
- int result;
- int alloc_failed = 0;
-
- if(!in)
- return;
-
-#if 0
- T(YAFFS_TRACE_SCAN,(TSTR("details for object %d %s loaded" TENDSTR),
- in->objectId,
- in->lazyLoaded ? "not yet" : "already"));
-#endif
-
- if(in->lazyLoaded){
- in->lazyLoaded = 0;
- chunkData = yaffs_GetTempBuffer(dev, __LINE__);
-
- result = yaffs_ReadChunkWithTagsFromNAND(dev,in->chunkId,chunkData,&tags);
- oh = (yaffs_ObjectHeader *) chunkData;
-
- in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
- in->win_atime[0] = oh->win_atime[0];
- in->win_ctime[0] = oh->win_ctime[0];
- in->win_mtime[0] = oh->win_mtime[0];
- in->win_atime[1] = oh->win_atime[1];
- in->win_ctime[1] = oh->win_ctime[1];
- in->win_mtime[1] = oh->win_mtime[1];
-#else
- in->yst_uid = oh->yst_uid;
- in->yst_gid = oh->yst_gid;
- in->yst_atime = oh->yst_atime;
- in->yst_mtime = oh->yst_mtime;
- in->yst_ctime = oh->yst_ctime;
- in->yst_rdev = oh->yst_rdev;
-
-#endif
- yaffs_SetObjectName(in, oh->name);
-
- if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
- in->variant.symLinkVariant.alias =
- yaffs_CloneString(oh->alias);
- if(!in->variant.symLinkVariant.alias)
- alloc_failed = 1; /* Not returned to caller */
- }
-
- yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
- }
-}
-
-static int yaffs_ScanBackwards(yaffs_Device * dev)
-{
- yaffs_ExtendedTags tags;
- int blk;
- int blockIterator;
- int startIterator;
- int endIterator;
- int nBlocksToScan = 0;
-
- int chunk;
- int result;
- int c;
- int deleted;
- yaffs_BlockState state;
- yaffs_Object *hardList = NULL;
- yaffs_BlockInfo *bi;
- int sequenceNumber;
- yaffs_ObjectHeader *oh;
- yaffs_Object *in;
- yaffs_Object *parent;
- int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
- int itsUnlinked;
- __u8 *chunkData;
-
- int fileSize;
- int isShrink;
- int foundChunksInBlock;
- int equivalentObjectId;
- int alloc_failed = 0;
-
-
- yaffs_BlockIndex *blockIndex = NULL;
- int altBlockIndex = 0;
-
- if (!dev->isYaffs2) {
- T(YAFFS_TRACE_SCAN,
- (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
- return YAFFS_FAIL;
- }
-
- T(YAFFS_TRACE_SCAN,
- (TSTR
- ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
- TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
-
-
- dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
-
- blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
-
- if(!blockIndex) {
- blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
- altBlockIndex = 1;
- }
-
- if(!blockIndex) {
- T(YAFFS_TRACE_SCAN,
- (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
- return YAFFS_FAIL;
- }
-
- dev->blocksInCheckpoint = 0;
-
- chunkData = yaffs_GetTempBuffer(dev, __LINE__);
-
- /* Scan all the blocks to determine their state */
- for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
- bi = yaffs_GetBlockInfo(dev, blk);
- yaffs_ClearChunkBits(dev, blk);
- bi->pagesInUse = 0;
- bi->softDeletions = 0;
-
- yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
-
- bi->blockState = state;
- bi->sequenceNumber = sequenceNumber;
-
- if(bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
- bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
-
- T(YAFFS_TRACE_SCAN_DEBUG,
- (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
- state, sequenceNumber));
-
-
- if(state == YAFFS_BLOCK_STATE_CHECKPOINT){
- dev->blocksInCheckpoint++;
-
- } else if (state == YAFFS_BLOCK_STATE_DEAD) {
- T(YAFFS_TRACE_BAD_BLOCKS,
- (TSTR("block %d is bad" TENDSTR), blk));
- } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
- T(YAFFS_TRACE_SCAN_DEBUG,
- (TSTR("Block empty " TENDSTR)));
- dev->nErasedBlocks++;
- dev->nFreeChunks += dev->nChunksPerBlock;
- } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-
- /* Determine the highest sequence number */
- if (dev->isYaffs2 &&
- sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
- sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
-
- blockIndex[nBlocksToScan].seq = sequenceNumber;
- blockIndex[nBlocksToScan].block = blk;
-
- nBlocksToScan++;
-
- if (sequenceNumber >= dev->sequenceNumber) {
- dev->sequenceNumber = sequenceNumber;
- }
- } else if (dev->isYaffs2) {
- /* TODO: Nasty sequence number! */
- T(YAFFS_TRACE_SCAN,
- (TSTR
- ("Block scanning block %d has bad sequence number %d"
- TENDSTR), blk, sequenceNumber));
-
- }
- }
- }
-
- T(YAFFS_TRACE_SCAN,
- (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
-
-
-
- YYIELD();
-
- /* Sort the blocks */
-#ifndef CONFIG_YAFFS_USE_OWN_SORT
- yaffs_qsort(blockIndex, nBlocksToScan,
- sizeof(yaffs_BlockIndex), ybicmp);
-#else
- {
- /* Dungy old bubble sort... */
-
- yaffs_BlockIndex temp;
- int i;
- int j;
-
- for (i = 0; i < nBlocksToScan; i++)
- for (j = i + 1; j < nBlocksToScan; j++)
- if (blockIndex[i].seq > blockIndex[j].seq) {
- temp = blockIndex[j];
- blockIndex[j] = blockIndex[i];
- blockIndex[i] = temp;
- }
- }
-#endif
-
- YYIELD();
-
- T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
-
- /* Now scan the blocks looking at the data. */
- startIterator = 0;
- endIterator = nBlocksToScan - 1;
- T(YAFFS_TRACE_SCAN_DEBUG,
- (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
-
- /* For each block.... backwards */
- for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
- blockIterator--) {
- /* Cooperative multitasking! This loop can run for so
- long that watchdog timers expire. */
- YYIELD();
-
- /* get the block to scan in the correct order */
- blk = blockIndex[blockIterator].block;
-
- bi = yaffs_GetBlockInfo(dev, blk);
-
-
- state = bi->blockState;
-
- deleted = 0;
-
- /* For each chunk in each block that needs scanning.... */
- foundChunksInBlock = 0;
- for (c = dev->nChunksPerBlock - 1;
- !alloc_failed && c >= 0 &&
- (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
- state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
- /* Scan backwards...
- * Read the tags and decide what to do
- */
-
- chunk = blk * dev->nChunksPerBlock + c;
-
- result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
- &tags);
-
- /* Let's have a good look at this chunk... */
-
- if (!tags.chunkUsed) {
- /* An unassigned chunk in the block.
- * If there are used chunks after this one, then
- * it is a chunk that was skipped due to failing the erased
- * check. Just skip it so that it can be deleted.
- * But, more typically, We get here when this is an unallocated
- * chunk and his means that either the block is empty or
- * this is the one being allocated from
- */
-
- if(foundChunksInBlock)
- {
- /* This is a chunk that was skipped due to failing the erased check */
-
- } else if (c == 0) {
- /* We're looking at the first chunk in the block so the block is unused */
- state = YAFFS_BLOCK_STATE_EMPTY;
- dev->nErasedBlocks++;
- } else {
- if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
- state == YAFFS_BLOCK_STATE_ALLOCATING) {
- if(dev->sequenceNumber == bi->sequenceNumber) {
- /* this is the block being allocated from */
-
- T(YAFFS_TRACE_SCAN,
- (TSTR
- (" Allocating from %d %d"
- TENDSTR), blk, c));
-
- state = YAFFS_BLOCK_STATE_ALLOCATING;
- dev->allocationBlock = blk;
- dev->allocationPage = c;
- dev->allocationBlockFinder = blk;
- }
- else {
- /* This is a partially written block that is not
- * the current allocation block. This block must have
- * had a write failure, so set up for retirement.
- */
-
- bi->needsRetiring = 1;
- bi->gcPrioritise = 1;
-
- T(YAFFS_TRACE_ALWAYS,
- (TSTR("Partially written block %d being set for retirement" TENDSTR),
- blk));
- }
-
- }
-
- }
-
- dev->nFreeChunks++;
-
- } else if (tags.chunkId > 0) {
- /* chunkId > 0 so it is a data chunk... */
- unsigned int endpos;
- __u32 chunkBase =
- (tags.chunkId - 1) * dev->nDataBytesPerChunk;
-
- foundChunksInBlock = 1;
-
-
- yaffs_SetChunkBit(dev, blk, c);
- bi->pagesInUse++;
-
- in = yaffs_FindOrCreateObjectByNumber(dev,
- tags.
- objectId,
- YAFFS_OBJECT_TYPE_FILE);
- if(!in){
- /* Out of memory */
- alloc_failed = 1;
- }
-
- if (in &&
- in->variantType == YAFFS_OBJECT_TYPE_FILE
- && chunkBase <
- in->variant.fileVariant.shrinkSize) {
- /* This has not been invalidated by a resize */
- if(!yaffs_PutChunkIntoFile(in, tags.chunkId,
- chunk, -1)){
- alloc_failed = 1;
- }
-
- /* File size is calculated by looking at the data chunks if we have not
- * seen an object header yet. Stop this practice once we find an object header.
- */
- endpos =
- (tags.chunkId -
- 1) * dev->nDataBytesPerChunk +
- tags.byteCount;
-
- if (!in->valid && /* have not got an object header yet */
- in->variant.fileVariant.
- scannedFileSize < endpos) {
- in->variant.fileVariant.
- scannedFileSize = endpos;
- in->variant.fileVariant.
- fileSize =
- in->variant.fileVariant.
- scannedFileSize;
- }
-
- } else if(in) {
- /* This chunk has been invalidated by a resize, so delete */
- yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
-
- }
- } else {
- /* chunkId == 0, so it is an ObjectHeader.
- * Thus, we read in the object header and make the object
- */
- foundChunksInBlock = 1;
-
- yaffs_SetChunkBit(dev, blk, c);
- bi->pagesInUse++;
-
- oh = NULL;
- in = NULL;
-
- if (tags.extraHeaderInfoAvailable) {
- in = yaffs_FindOrCreateObjectByNumber
- (dev, tags.objectId,
- tags.extraObjectType);
- }
-
- if (!in ||
-#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
- !in->valid ||
-#endif
- tags.extraShadows ||
- (!in->valid &&
- (tags.objectId == YAFFS_OBJECTID_ROOT ||
- tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
- ) {
-
- /* If we don't have valid info then we need to read the chunk
- * TODO In future we can probably defer reading the chunk and
- * living with invalid data until needed.
- */
-
- result = yaffs_ReadChunkWithTagsFromNAND(dev,
- chunk,
- chunkData,
- NULL);
-
- oh = (yaffs_ObjectHeader *) chunkData;
-
- if (!in)
- in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
-
- }
-
- if (!in) {
- /* TODO Hoosterman we have a problem! */
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("yaffs tragedy: Could not make object for object %d "
- "at chunk %d during scan"
- TENDSTR), tags.objectId, chunk));
-
- }
-
- if (in->valid) {
- /* We have already filled this one.
- * We have a duplicate that will be discarded, but
- * we first have to suck out resize info if it is a file.
- */
-
- if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
- ((oh &&
- oh-> type == YAFFS_OBJECT_TYPE_FILE)||
- (tags.extraHeaderInfoAvailable &&
- tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
- ) {
- __u32 thisSize =
- (oh) ? oh->fileSize : tags.
- extraFileLength;
- __u32 parentObjectId =
- (oh) ? oh->
- parentObjectId : tags.
- extraParentObjectId;
- unsigned isShrink =
- (oh) ? oh->isShrink : tags.
- extraIsShrinkHeader;
-
- /* If it is deleted (unlinked at start also means deleted)
- * we treat the file size as being zeroed at this point.
- */
- if (parentObjectId ==
- YAFFS_OBJECTID_DELETED
- || parentObjectId ==
- YAFFS_OBJECTID_UNLINKED) {
- thisSize = 0;
- isShrink = 1;
- }
-
- if (isShrink &&
- in->variant.fileVariant.
- shrinkSize > thisSize) {
- in->variant.fileVariant.
- shrinkSize =
- thisSize;
- }
-
- if (isShrink) {
- bi->hasShrinkHeader = 1;
- }
-
- }
- /* Use existing - destroy this one. */
- yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
-
- }
-
- if (!in->valid &&
- (tags.objectId == YAFFS_OBJECTID_ROOT ||
- tags.objectId ==
- YAFFS_OBJECTID_LOSTNFOUND)) {
- /* We only load some info, don't fiddle with directory structure */
- in->valid = 1;
-
- if(oh) {
- in->variantType = oh->type;
-
- in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
- in->win_atime[0] = oh->win_atime[0];
- in->win_ctime[0] = oh->win_ctime[0];
- in->win_mtime[0] = oh->win_mtime[0];
- in->win_atime[1] = oh->win_atime[1];
- in->win_ctime[1] = oh->win_ctime[1];
- in->win_mtime[1] = oh->win_mtime[1];
-#else
- in->yst_uid = oh->yst_uid;
- in->yst_gid = oh->yst_gid;
- in->yst_atime = oh->yst_atime;
- in->yst_mtime = oh->yst_mtime;
- in->yst_ctime = oh->yst_ctime;
- in->yst_rdev = oh->yst_rdev;
-
-#endif
- } else {
- in->variantType = tags.extraObjectType;
- in->lazyLoaded = 1;
- }
-
- in->chunkId = chunk;
-
- } else if (!in->valid) {
- /* we need to load this info */
-
- in->valid = 1;
- in->chunkId = chunk;
-
- if(oh) {
- in->variantType = oh->type;
-
- in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
- in->win_atime[0] = oh->win_atime[0];
- in->win_ctime[0] = oh->win_ctime[0];
- in->win_mtime[0] = oh->win_mtime[0];
- in->win_atime[1] = oh->win_atime[1];
- in->win_ctime[1] = oh->win_ctime[1];
- in->win_mtime[1] = oh->win_mtime[1];
-#else
- in->yst_uid = oh->yst_uid;
- in->yst_gid = oh->yst_gid;
- in->yst_atime = oh->yst_atime;
- in->yst_mtime = oh->yst_mtime;
- in->yst_ctime = oh->yst_ctime;
- in->yst_rdev = oh->yst_rdev;
-#endif
-
- if (oh->shadowsObject > 0)
- yaffs_HandleShadowedObject(dev,
- oh->
- shadowsObject,
- 1);
-
-
- yaffs_SetObjectName(in, oh->name);
- parent =
- yaffs_FindOrCreateObjectByNumber
- (dev, oh->parentObjectId,
- YAFFS_OBJECT_TYPE_DIRECTORY);
-
- fileSize = oh->fileSize;
- isShrink = oh->isShrink;
- equivalentObjectId = oh->equivalentObjectId;
-
- }
- else {
- in->variantType = tags.extraObjectType;
- parent =
- yaffs_FindOrCreateObjectByNumber
- (dev, tags.extraParentObjectId,
- YAFFS_OBJECT_TYPE_DIRECTORY);
- fileSize = tags.extraFileLength;
- isShrink = tags.extraIsShrinkHeader;
- equivalentObjectId = tags.extraEquivalentObjectId;
- in->lazyLoaded = 1;
-
- }
- in->dirty = 0;
-
- /* directory stuff...
- * hook up to parent
- */
-
- if (parent->variantType ==
- YAFFS_OBJECT_TYPE_UNKNOWN) {
- /* Set up as a directory */
- parent->variantType =
- YAFFS_OBJECT_TYPE_DIRECTORY;
- INIT_LIST_HEAD(&parent->variant.
- directoryVariant.
- children);
- } else if (parent->variantType !=
- YAFFS_OBJECT_TYPE_DIRECTORY)
- {
- /* Hoosterman, another problem....
- * We're trying to use a non-directory as a directory
- */
-
- T(YAFFS_TRACE_ERROR,
- (TSTR
- ("yaffs tragedy: attempting to use non-directory as"
- " a directory in scan. Put in lost+found."
- TENDSTR)));
- parent = dev->lostNFoundDir;
- }
-
- yaffs_AddObjectToDirectory(parent, in);
-
- itsUnlinked = (parent == dev->deletedDir) ||
- (parent == dev->unlinkedDir);
-
- if (isShrink) {
- /* Mark the block as having a shrinkHeader */
- bi->hasShrinkHeader = 1;
- }
-
- /* Note re hardlinks.
- * Since we might scan a hardlink before its equivalent object is scanned
- * we put them all in a list.
- * After scanning is complete, we should have all the objects, so we run
- * through this list and fix up all the chains.
- */
-
- switch (in->variantType) {
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- /* Todo got a problem */
- break;
- case YAFFS_OBJECT_TYPE_FILE:
-
- if (in->variant.fileVariant.
- scannedFileSize < fileSize) {
- /* This covers the case where the file size is greater
- * than where the data is
- * This will happen if the file is resized to be larger
- * than its current data extents.
- */
- in->variant.fileVariant.fileSize = fileSize;
- in->variant.fileVariant.scannedFileSize =
- in->variant.fileVariant.fileSize;
- }
-
- if (isShrink &&
- in->variant.fileVariant.shrinkSize > fileSize) {
- in->variant.fileVariant.shrinkSize = fileSize;
- }
-
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- if(!itsUnlinked) {
- in->variant.hardLinkVariant.equivalentObjectId =
- equivalentObjectId;
- in->hardLinks.next =
- (struct list_head *) hardList;
- hardList = in;
- }
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- /* Do nothing */
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- /* Do nothing */
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- if(oh){
- in->variant.symLinkVariant.alias =
- yaffs_CloneString(oh->
- alias);
- if(!in->variant.symLinkVariant.alias)
- alloc_failed = 1;
- }
- break;
- }
-
- }
-
- }
-
- } /* End of scanning for each chunk */
-
- if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
- /* If we got this far while scanning, then the block is fully allocated. */
- state = YAFFS_BLOCK_STATE_FULL;
- }
-
- bi->blockState = state;
-
- /* Now let's see if it was dirty */
- if (bi->pagesInUse == 0 &&
- !bi->hasShrinkHeader &&
- bi->blockState == YAFFS_BLOCK_STATE_FULL) {
- yaffs_BlockBecameDirty(dev, blk);
- }
-
- }
-
- if (altBlockIndex)
- YFREE_ALT(blockIndex);
- else
- YFREE(blockIndex);
-
- /* Ok, we've done all the scanning.
- * Fix up the hard link chains.
- * We should now have scanned all the objects, now it's time to add these
- * hardlinks.
- */
- yaffs_HardlinkFixup(dev,hardList);
-
-
- /*
- * Sort out state of unlinked and deleted objects.
- */
- {
- struct list_head *i;
- struct list_head *n;
-
- yaffs_Object *l;
-
- /* Soft delete all the unlinked files */
- list_for_each_safe(i, n,
- &dev->unlinkedDir->variant.directoryVariant.
- children) {
- if (i) {
- l = list_entry(i, yaffs_Object, siblings);
- yaffs_DestroyObject(l);
- }
- }
-
- /* Soft delete all the deletedDir files */
- list_for_each_safe(i, n,
- &dev->deletedDir->variant.directoryVariant.
- children) {
- if (i) {
- l = list_entry(i, yaffs_Object, siblings);
- yaffs_DestroyObject(l);
-
- }
- }
- }
-
- yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
-
- if(alloc_failed){
- return YAFFS_FAIL;
- }
-
- T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
-
- return YAFFS_OK;
-}
-
-/*------------------------------ Directory Functions ----------------------------- */
-
-static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
-{
- yaffs_Device *dev = obj->myDev;
-
- if(dev && dev->removeObjectCallback)
- dev->removeObjectCallback(obj);
-
- list_del_init(&obj->siblings);
- obj->parent = NULL;
-}
-
-
-static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
- yaffs_Object * obj)
-{
-
- if (!directory) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("tragedy: Trying to add an object to a null pointer directory"
- TENDSTR)));
- YBUG();
- }
- if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("tragedy: Trying to add an object to a non-directory"
- TENDSTR)));
- YBUG();
- }
-
- if (obj->siblings.prev == NULL) {
- /* Not initialised */
- INIT_LIST_HEAD(&obj->siblings);
-
- } else if (!list_empty(&obj->siblings)) {
- /* If it is holed up somewhere else, un hook it */
- yaffs_RemoveObjectFromDirectory(obj);
- }
- /* Now add it */
- list_add(&obj->siblings, &directory->variant.directoryVariant.children);
- obj->parent = directory;
-
- if (directory == obj->myDev->unlinkedDir
- || directory == obj->myDev->deletedDir) {
- obj->unlinked = 1;
- obj->myDev->nUnlinkedFiles++;
- obj->renameAllowed = 0;
- }
-}
-
-yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
- const YCHAR * name)
-{
- int sum;
-
- struct list_head *i;
- YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
-
- yaffs_Object *l;
-
- if (!name) {
- return NULL;
- }
-
- if (!directory) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("tragedy: yaffs_FindObjectByName: null pointer directory"
- TENDSTR)));
- YBUG();
- }
- if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
- YBUG();
- }
-
- sum = yaffs_CalcNameSum(name);
-
- list_for_each(i, &directory->variant.directoryVariant.children) {
- if (i) {
- l = list_entry(i, yaffs_Object, siblings);
-
- yaffs_CheckObjectDetailsLoaded(l);
-
- /* Special case for lost-n-found */
- if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
- if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
- return l;
- }
- } else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
- {
- /* LostnFound cunk called Objxxx
- * Do a real check
- */
- yaffs_GetObjectName(l, buffer,
- YAFFS_MAX_NAME_LENGTH);
- if (yaffs_strncmp(name, buffer,YAFFS_MAX_NAME_LENGTH) == 0) {
- return l;
- }
-
- }
- }
- }
-
- return NULL;
-}
-
-
-#if 0
-int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
- int (*fn) (yaffs_Object *))
-{
- struct list_head *i;
- yaffs_Object *l;
-
- if (!theDir) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("tragedy: yaffs_FindObjectByName: null pointer directory"
- TENDSTR)));
- YBUG();
- }
- if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
- YBUG();
- }
-
- list_for_each(i, &theDir->variant.directoryVariant.children) {
- if (i) {
- l = list_entry(i, yaffs_Object, siblings);
- if (l && !fn(l)) {
- return YAFFS_FAIL;
- }
- }
- }
-
- return YAFFS_OK;
-
-}
-#endif
-
-/* GetEquivalentObject dereferences any hard links to get to the
- * actual object.
- */
-
-yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
-{
- if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
- /* We want the object id of the equivalent object, not this one */
- obj = obj->variant.hardLinkVariant.equivalentObject;
- yaffs_CheckObjectDetailsLoaded(obj);
- }
- return obj;
-
-}
-
-int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
-{
- memset(name, 0, buffSize * sizeof(YCHAR));
-
- yaffs_CheckObjectDetailsLoaded(obj);
-
- if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
- yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
- } else if (obj->chunkId <= 0) {
- YCHAR locName[20];
- /* make up a name */
- yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
- obj->objectId);
- yaffs_strncpy(name, locName, buffSize - 1);
-
- }
-#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
- else if (obj->shortName[0]) {
- yaffs_strcpy(name, obj->shortName);
- }
-#endif
- else {
- int result;
- __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
-
- yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
-
- memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
-
- if (obj->chunkId >= 0) {
- result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
- obj->chunkId, buffer,
- NULL);
- }
- yaffs_strncpy(name, oh->name, buffSize - 1);
-
- yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
- }
-
- return yaffs_strlen(name);
-}
-
-int yaffs_GetObjectFileLength(yaffs_Object * obj)
-{
-
- /* Dereference any hard linking */
- obj = yaffs_GetEquivalentObject(obj);
-
- if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
- return obj->variant.fileVariant.fileSize;
- }
- if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
- return yaffs_strlen(obj->variant.symLinkVariant.alias);
- } else {
- /* Only a directory should drop through to here */
- return obj->myDev->nDataBytesPerChunk;
- }
-}
-
-int yaffs_GetObjectLinkCount(yaffs_Object * obj)
-{
- int count = 0;
- struct list_head *i;
-
- if (!obj->unlinked) {
- count++; /* the object itself */
- }
- list_for_each(i, &obj->hardLinks) {
- count++; /* add the hard links; */
- }
- return count;
-
-}
-
-int yaffs_GetObjectInode(yaffs_Object * obj)
-{
- obj = yaffs_GetEquivalentObject(obj);
-
- return obj->objectId;
-}
-
-unsigned yaffs_GetObjectType(yaffs_Object * obj)
-{
- obj = yaffs_GetEquivalentObject(obj);
-
- switch (obj->variantType) {
- case YAFFS_OBJECT_TYPE_FILE:
- return DT_REG;
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- return DT_DIR;
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- return DT_LNK;
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- return DT_REG;
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- if (S_ISFIFO(obj->yst_mode))
- return DT_FIFO;
- if (S_ISCHR(obj->yst_mode))
- return DT_CHR;
- if (S_ISBLK(obj->yst_mode))
- return DT_BLK;
- if (S_ISSOCK(obj->yst_mode))
- return DT_SOCK;
- default:
- return DT_REG;
- break;
- }
-}
-
-YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
-{
- obj = yaffs_GetEquivalentObject(obj);
- if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
- return yaffs_CloneString(obj->variant.symLinkVariant.alias);
- } else {
- return yaffs_CloneString(_Y(""));
- }
-}
-
-#ifndef CONFIG_YAFFS_WINCE
-
-int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
-{
- unsigned int valid = attr->ia_valid;
-
- if (valid & ATTR_MODE)
- obj->yst_mode = attr->ia_mode;
- if (valid & ATTR_UID)
- obj->yst_uid = attr->ia_uid;
- if (valid & ATTR_GID)
- obj->yst_gid = attr->ia_gid;
-
- if (valid & ATTR_ATIME)
- obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
- if (valid & ATTR_CTIME)
- obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
- if (valid & ATTR_MTIME)
- obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
-
- if (valid & ATTR_SIZE)
- yaffs_ResizeFile(obj, attr->ia_size);
-
- yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
-
- return YAFFS_OK;
-
-}
-int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
-{
- unsigned int valid = 0;
-
- attr->ia_mode = obj->yst_mode;
- valid |= ATTR_MODE;
- attr->ia_uid = obj->yst_uid;
- valid |= ATTR_UID;
- attr->ia_gid = obj->yst_gid;
- valid |= ATTR_GID;
-
- Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
- valid |= ATTR_ATIME;
- Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
- valid |= ATTR_CTIME;
- Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
- valid |= ATTR_MTIME;
-
- attr->ia_size = yaffs_GetFileSize(obj);
- valid |= ATTR_SIZE;
-
- attr->ia_valid = valid;
-
- return YAFFS_OK;
-
-}
-
-#endif
-
-#if 0
-int yaffs_DumpObject(yaffs_Object * obj)
-{
- YCHAR name[257];
-
- yaffs_GetObjectName(obj, name, 256);
-
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
- " chunk %d type %d size %d\n"
- TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
- obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
- yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
-
- return YAFFS_OK;
-}
-#endif
-
-/*---------------------------- Initialisation code -------------------------------------- */
-
-static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
-{
-
- /* Common functions, gotta have */
- if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
- return 0;
-
-#ifdef CONFIG_YAFFS_YAFFS2
-
- /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
- if (dev->writeChunkWithTagsToNAND &&
- dev->readChunkWithTagsFromNAND &&
- !dev->writeChunkToNAND &&
- !dev->readChunkFromNAND &&
- dev->markNANDBlockBad && dev->queryNANDBlock)
- return 1;
-#endif
-
- /* Can use the "spare" style interface for yaffs1 */
- if (!dev->isYaffs2 &&
- !dev->writeChunkWithTagsToNAND &&
- !dev->readChunkWithTagsFromNAND &&
- dev->writeChunkToNAND &&
- dev->readChunkFromNAND &&
- !dev->markNANDBlockBad && !dev->queryNANDBlock)
- return 1;
-
- return 0; /* bad */
-}
-
-
-static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
-{
- /* Initialise the unlinked, deleted, root and lost and found directories */
-
- dev->lostNFoundDir = dev->rootDir = NULL;
- dev->unlinkedDir = dev->deletedDir = NULL;
-
- dev->unlinkedDir =
- yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
-
- dev->deletedDir =
- yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
-
- dev->rootDir =
- yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
- YAFFS_ROOT_MODE | S_IFDIR);
- dev->lostNFoundDir =
- yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
- YAFFS_LOSTNFOUND_MODE | S_IFDIR);
-
- if(dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir){
- yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
- return YAFFS_OK;
- }
-
- return YAFFS_FAIL;
-}
-
-int yaffs_GutsInitialise(yaffs_Device * dev)
-{
- int init_failed = 0;
- unsigned x;
- int bits;
-
- T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
-
- /* Check stuff that must be set */
-
- if (!dev) {
- T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
- return YAFFS_FAIL;
- }
-
- dev->internalStartBlock = dev->startBlock;
- dev->internalEndBlock = dev->endBlock;
- dev->blockOffset = 0;
- dev->chunkOffset = 0;
- dev->nFreeChunks = 0;
-
- if (dev->startBlock == 0) {
- dev->internalStartBlock = dev->startBlock + 1;
- dev->internalEndBlock = dev->endBlock + 1;
- dev->blockOffset = 1;
- dev->chunkOffset = dev->nChunksPerBlock;
- }
-
- /* Check geometry parameters. */
-
- if ((dev->isYaffs2 && dev->nDataBytesPerChunk < 1024) ||
- (!dev->isYaffs2 && dev->nDataBytesPerChunk != 512) ||
- dev->nChunksPerBlock < 2 ||
- dev->nReservedBlocks < 2 ||
- dev->internalStartBlock <= 0 ||
- dev->internalEndBlock <= 0 ||
- dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2) // otherwise it is too small
- ) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
- TENDSTR), dev->nDataBytesPerChunk, dev->isYaffs2 ? "2" : ""));
- return YAFFS_FAIL;
- }
-
- if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
- return YAFFS_FAIL;
- }
-
- /* Got the right mix of functions? */
- if (!yaffs_CheckDevFunctions(dev)) {
- /* Function missing */
- T(YAFFS_TRACE_ALWAYS,
- (TSTR
- ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
-
- return YAFFS_FAIL;
- }
-
- /* This is really a compilation check. */
- if (!yaffs_CheckStructures()) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
- return YAFFS_FAIL;
- }
-
- if (dev->isMounted) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR("yaffs: device already mounted\n" TENDSTR)));
- return YAFFS_FAIL;
- }
-
- /* Finished with most checks. One or two more checks happen later on too. */
-
- dev->isMounted = 1;
-
-
-
- /* OK now calculate a few things for the device */
-
- /*
- * Calculate all the chunk size manipulation numbers:
- */
- /* Start off assuming it is a power of 2 */
- dev->chunkShift = ShiftDiv(dev->nDataBytesPerChunk);
- dev->chunkMask = (1<<dev->chunkShift) - 1;
-
- if(dev->nDataBytesPerChunk == (dev->chunkMask + 1)){
- /* Yes it is a power of 2, disable crumbs */
- dev->crumbMask = 0;
- dev->crumbShift = 0;
- dev->crumbsPerChunk = 0;
- } else {
- /* Not a power of 2, use crumbs instead */
- dev->crumbShift = ShiftDiv(sizeof(yaffs_PackedTags2TagsPart));
- dev->crumbMask = (1<<dev->crumbShift)-1;
- dev->crumbsPerChunk = dev->nDataBytesPerChunk/(1 << dev->crumbShift);
- dev->chunkShift = 0;
- dev->chunkMask = 0;
- }
-
-
- /*
- * Calculate chunkGroupBits.
- * We need to find the next power of 2 > than internalEndBlock
- */
-
- x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
-
- bits = ShiftsGE(x);
-
- /* Set up tnode width if wide tnodes are enabled. */
- if(!dev->wideTnodesDisabled){
- /* bits must be even so that we end up with 32-bit words */
- if(bits & 1)
- bits++;
- if(bits < 16)
- dev->tnodeWidth = 16;
- else
- dev->tnodeWidth = bits;
- }
- else
- dev->tnodeWidth = 16;
-
- dev->tnodeMask = (1<<dev->tnodeWidth)-1;
-
- /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
- * so if the bitwidth of the
- * chunk range we're using is greater than 16 we need
- * to figure out chunk shift and chunkGroupSize
- */
-
- if (bits <= dev->tnodeWidth)
- dev->chunkGroupBits = 0;
- else
- dev->chunkGroupBits = bits - dev->tnodeWidth;
-
-
- dev->chunkGroupSize = 1 << dev->chunkGroupBits;
-
- if (dev->nChunksPerBlock < dev->chunkGroupSize) {
- /* We have a problem because the soft delete won't work if
- * the chunk group size > chunks per block.
- * This can be remedied by using larger "virtual blocks".
- */
- T(YAFFS_TRACE_ALWAYS,
- (TSTR("yaffs: chunk group too large\n" TENDSTR)));
-
- return YAFFS_FAIL;
- }
-
- /* OK, we've finished verifying the device, lets continue with initialisation */
-
- /* More device initialisation */
- dev->garbageCollections = 0;
- dev->passiveGarbageCollections = 0;
- dev->currentDirtyChecker = 0;
- dev->bufferedBlock = -1;
- dev->doingBufferedBlockRewrite = 0;
- dev->nDeletedFiles = 0;
- dev->nBackgroundDeletions = 0;
- dev->nUnlinkedFiles = 0;
- dev->eccFixed = 0;
- dev->eccUnfixed = 0;
- dev->tagsEccFixed = 0;
- dev->tagsEccUnfixed = 0;
- dev->nErasureFailures = 0;
- dev->nErasedBlocks = 0;
- dev->isDoingGC = 0;
- dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
-
- /* Initialise temporary buffers and caches. */
- if(!yaffs_InitialiseTempBuffers(dev))
- init_failed = 1;
-
- dev->srCache = NULL;
- dev->gcCleanupList = NULL;
-
-
- if (!init_failed &&
- dev->nShortOpCaches > 0) {
- int i;
- __u8 *buf;
- int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
-
- if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
- dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
- }
-
- buf = dev->srCache = YMALLOC(srCacheBytes);
-
- if(dev->srCache)
- memset(dev->srCache,0,srCacheBytes);
-
- for (i = 0; i < dev->nShortOpCaches && buf; i++) {
- dev->srCache[i].object = NULL;
- dev->srCache[i].lastUse = 0;
- dev->srCache[i].dirty = 0;
- dev->srCache[i].data = buf = YMALLOC_DMA(dev->nDataBytesPerChunk);
- }
- if(!buf)
- init_failed = 1;
-
- dev->srLastUse = 0;
- }
-
- dev->cacheHits = 0;
-
- if(!init_failed){
- dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
- if(!dev->gcCleanupList)
- init_failed = 1;
- }
-
- if (dev->isYaffs2) {
- dev->useHeaderFileSize = 1;
- }
- if(!init_failed && !yaffs_InitialiseBlocks(dev))
- init_failed = 1;
-
- yaffs_InitialiseTnodes(dev);
- yaffs_InitialiseObjects(dev);
-
- if(!init_failed && !yaffs_CreateInitialDirectories(dev))
- init_failed = 1;
-
-
- if(!init_failed){
- /* Now scan the flash. */
- if (dev->isYaffs2) {
- if(yaffs_CheckpointRestore(dev)) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR("yaffs: restored from checkpoint" TENDSTR)));
- } else {
-
- /* Clean up the mess caused by an aborted checkpoint load
- * and scan backwards.
- */
- yaffs_DeinitialiseBlocks(dev);
- yaffs_DeinitialiseTnodes(dev);
- yaffs_DeinitialiseObjects(dev);
-
-
- dev->nErasedBlocks = 0;
- dev->nFreeChunks = 0;
- dev->allocationBlock = -1;
- dev->allocationPage = -1;
- dev->nDeletedFiles = 0;
- dev->nUnlinkedFiles = 0;
- dev->nBackgroundDeletions = 0;
- dev->oldestDirtySequence = 0;
-
- if(!init_failed && !yaffs_InitialiseBlocks(dev))
- init_failed = 1;
-
- yaffs_InitialiseTnodes(dev);
- yaffs_InitialiseObjects(dev);
-
- if(!init_failed && !yaffs_CreateInitialDirectories(dev))
- init_failed = 1;
-
- if(!init_failed && !yaffs_ScanBackwards(dev))
- init_failed = 1;
- }
- }else
- if(!yaffs_Scan(dev))
- init_failed = 1;
- }
-
- if(init_failed){
- /* Clean up the mess */
- T(YAFFS_TRACE_TRACING,
- (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
-
- yaffs_Deinitialise(dev);
- return YAFFS_FAIL;
- }
-
- /* Zero out stats */
- dev->nPageReads = 0;
- dev->nPageWrites = 0;
- dev->nBlockErasures = 0;
- dev->nGCCopies = 0;
- dev->nRetriedWrites = 0;
-
- dev->nRetiredBlocks = 0;
-
- yaffs_VerifyFreeChunks(dev);
- yaffs_VerifyBlocks(dev);
-
-
- T(YAFFS_TRACE_TRACING,
- (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
- return YAFFS_OK;
-
-}
-
-void yaffs_Deinitialise(yaffs_Device * dev)
-{
- if (dev->isMounted) {
- int i;
-
- yaffs_DeinitialiseBlocks(dev);
- yaffs_DeinitialiseTnodes(dev);
- yaffs_DeinitialiseObjects(dev);
- if (dev->nShortOpCaches > 0 &&
- dev->srCache) {
-
- for (i = 0; i < dev->nShortOpCaches; i++) {
- if(dev->srCache[i].data)
- YFREE(dev->srCache[i].data);
- dev->srCache[i].data = NULL;
- }
-
- YFREE(dev->srCache);
- dev->srCache = NULL;
- }
-
- YFREE(dev->gcCleanupList);
-
- for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
- YFREE(dev->tempBuffer[i].buffer);
- }
-
- dev->isMounted = 0;
- }
-
-}
-
-static int yaffs_CountFreeChunks(yaffs_Device * dev)
-{
- int nFree;
- int b;
-
- yaffs_BlockInfo *blk;
-
- for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
- b++) {
- blk = yaffs_GetBlockInfo(dev, b);
-
- switch (blk->blockState) {
- case YAFFS_BLOCK_STATE_EMPTY:
- case YAFFS_BLOCK_STATE_ALLOCATING:
- case YAFFS_BLOCK_STATE_COLLECTING:
- case YAFFS_BLOCK_STATE_FULL:
- nFree +=
- (dev->nChunksPerBlock - blk->pagesInUse +
- blk->softDeletions);
- break;
- default:
- break;
- }
-
- }
-
- return nFree;
-}
-
-int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
-{
- /* This is what we report to the outside world */
-
- int nFree;
- int nDirtyCacheChunks;
- int blocksForCheckpoint;
-
-#if 1
- nFree = dev->nFreeChunks;
-#else
- nFree = yaffs_CountFreeChunks(dev);
-#endif
-
- nFree += dev->nDeletedFiles;
-
- /* Now count the number of dirty chunks in the cache and subtract those */
-
- {
- int i;
- for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
- if (dev->srCache[i].dirty)
- nDirtyCacheChunks++;
- }
- }
-
- nFree -= nDirtyCacheChunks;
-
- nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
-
- /* Now we figure out how much to reserve for the checkpoint and report that... */
- blocksForCheckpoint = dev->nCheckpointReservedBlocks - dev->blocksInCheckpoint;
- if(blocksForCheckpoint < 0)
- blocksForCheckpoint = 0;
-
- nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
-
- if (nFree < 0)
- nFree = 0;
-
- return nFree;
-
-}
-
-static int yaffs_freeVerificationFailures;
-
-static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
-{
- int counted;
- int difference;
-
- if(yaffs_SkipVerification(dev))
- return;
-
- counted = yaffs_CountFreeChunks(dev);
-
- difference = dev->nFreeChunks - counted;
-
- if (difference) {
- T(YAFFS_TRACE_ALWAYS,
- (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
- dev->nFreeChunks, counted, difference));
- yaffs_freeVerificationFailures++;
- }
-}
-
-/*---------------------------------------- YAFFS test code ----------------------*/
-
-#define yaffs_CheckStruct(structure,syze, name) \
- if(sizeof(structure) != syze) \
- { \
- T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
- name,syze,sizeof(structure))); \
- return YAFFS_FAIL; \
- }
-
-static int yaffs_CheckStructures(void)
-{
-/* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
-/* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
-/* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
-#ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
- yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
-#endif
- yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")
-
- return YAFFS_OK;
-}
projects / openwrt / svn-archive / archive.git / commitdiff