2 * YAFFS: Yet another FFS. A NAND-flash specific file system.
4 * Copyright (C) 2002 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
15 const char *yaffs_guts_c_version =
16 "$Id: yaffs_guts.c,v 1.28 2006-02-02 22:14:44 charles Exp $";
20 #include "yaffsinterface.h"
21 #include "yaffs_guts.h"
22 #include "yaffs_tagsvalidity.h"
24 #include "yaffs_tagscompat.h"
26 #ifdef CONFIG_YAFFS_WINCE
27 void yfsd_LockYAFFS(BOOL fsLockOnly);
28 void yfsd_UnlockYAFFS(BOOL fsLockOnly);
31 #define YAFFS_PASSIVE_GC_CHUNKS 2
33 #include "yaffs_ecc.h"
37 static Y_INLINE int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device * dev,
40 yaffs_ExtendedTags * tags);
41 static Y_INLINE int yaffs_WriteChunkWithTagsToNAND(yaffs_Device * dev,
44 yaffs_ExtendedTags * tags);
45 static Y_INLINE int yaffs_MarkBlockBad(yaffs_Device * dev, int blockNo);
46 static Y_INLINE int yaffs_QueryInitialBlockState(yaffs_Device * dev,
48 yaffs_BlockState * state,
49 unsigned *sequenceNumber);
50 /* Robustification (if it ever comes about...) */
51 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND);
52 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND);
53 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
55 const yaffs_ExtendedTags * tags);
56 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
57 const yaffs_ExtendedTags * tags);
59 /* Other local prototypes */
60 static int yaffs_UnlinkObject( yaffs_Object *obj);
62 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device * dev,
64 yaffs_ExtendedTags * tags,
66 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
67 int chunkInNAND, int inScan);
69 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
70 yaffs_ObjectType type);
71 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
73 static int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name,
74 int force, int isShrink, int shadows);
75 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj);
76 static int yaffs_CheckStructures(void);
77 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
78 int chunkOffset, int *limit);
79 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
81 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
83 static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo);
84 static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
87 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
90 static int yaffs_UnlinkWorker(yaffs_Object * obj);
91 static void yaffs_DestroyObject(yaffs_Object * obj);
93 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
96 loff_t yaffs_GetFileSize(yaffs_Object * obj);
98 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve);
100 static void yaffs_VerifyFreeChunks(yaffs_Device * dev);
102 #ifdef YAFFS_PARANOID
103 static int yaffs_CheckFileSanity(yaffs_Object * in);
105 #define yaffs_CheckFileSanity(in)
108 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in);
109 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId);
113 * Start of real code.
122 static int yaffs_ReadChunkWithTagsFromNAND(yaffs_Device * dev, int chunkInNAND,
124 yaffs_ExtendedTags * tags)
126 chunkInNAND -= dev->chunkOffset;
128 if (dev->readChunkWithTagsFromNAND)
129 return dev->readChunkWithTagsFromNAND(dev, chunkInNAND, buffer,
132 return yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,
138 static Y_INLINE int yaffs_WriteChunkWithTagsToNAND(yaffs_Device * dev,
141 yaffs_ExtendedTags * tags)
143 chunkInNAND -= dev->chunkOffset;
146 tags->sequenceNumber = dev->sequenceNumber;
148 if (!yaffs_ValidateTags(tags)) {
150 (TSTR("Writing uninitialised tags" TENDSTR)));
154 (TSTR("Writing chunk %d tags %d %d" TENDSTR), chunkInNAND,
155 tags->objectId, tags->chunkId));
157 T(YAFFS_TRACE_ERROR, (TSTR("Writing with no tags" TENDSTR)));
161 if (dev->writeChunkWithTagsToNAND)
162 return dev->writeChunkWithTagsToNAND(dev, chunkInNAND, buffer,
165 return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,
171 static Y_INLINE int yaffs_MarkBlockBad(yaffs_Device * dev, int blockNo)
173 blockNo -= dev->blockOffset;
175 if (dev->markNANDBlockBad)
176 return dev->markNANDBlockBad(dev, blockNo);
178 return yaffs_TagsCompatabilityMarkNANDBlockBad(dev, blockNo);
180 static Y_INLINE int yaffs_QueryInitialBlockState(yaffs_Device * dev,
182 yaffs_BlockState * state,
183 unsigned *sequenceNumber)
185 blockNo -= dev->blockOffset;
187 if (dev->queryNANDBlock)
188 return dev->queryNANDBlock(dev, blockNo, state, sequenceNumber);
190 return yaffs_TagsCompatabilityQueryNANDBlock(dev, blockNo,
195 static int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,
200 blockInNAND -= dev->blockOffset;
202 dev->nBlockErasures++;
203 result = dev->eraseBlockInNAND(dev, blockInNAND);
205 /* If at first we don't succeed, try again *once*.*/
207 result = dev->eraseBlockInNAND(dev, blockInNAND);
211 static int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
213 return dev->initialiseNAND(dev);
217 * Temporary buffer manipulations.
220 static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
223 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
224 if (dev->tempBuffer[i].line == 0) {
225 dev->tempBuffer[i].line = lineNo;
226 if ((i + 1) > dev->maxTemp) {
227 dev->maxTemp = i + 1;
228 for (j = 0; j <= i; j++)
229 dev->tempBuffer[j].maxLine =
230 dev->tempBuffer[j].line;
233 return dev->tempBuffer[i].buffer;
237 T(YAFFS_TRACE_BUFFERS,
238 (TSTR("Out of temp buffers at line %d, other held by lines:"),
240 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
241 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
243 T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
246 * If we got here then we have to allocate an unmanaged one
250 dev->unmanagedTempAllocations++;
251 return YMALLOC(dev->nBytesPerChunk);
255 static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
259 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
260 if (dev->tempBuffer[i].buffer == buffer) {
261 dev->tempBuffer[i].line = 0;
267 /* assume it is an unmanaged one. */
268 T(YAFFS_TRACE_BUFFERS,
269 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
272 dev->unmanagedTempDeallocations++;
278 * Chunk bitmap manipulations
281 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
283 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
285 (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
289 return dev->chunkBits +
290 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
293 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
295 __u8 *blkBits = yaffs_BlockBits(dev, blk);
297 memset(blkBits, 0, dev->chunkBitmapStride);
300 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
302 __u8 *blkBits = yaffs_BlockBits(dev, blk);
304 blkBits[chunk / 8] &= ~(1 << (chunk & 7));
307 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
309 __u8 *blkBits = yaffs_BlockBits(dev, blk);
311 blkBits[chunk / 8] |= (1 << (chunk & 7));
314 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
316 __u8 *blkBits = yaffs_BlockBits(dev, blk);
317 return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
320 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
322 __u8 *blkBits = yaffs_BlockBits(dev, blk);
324 for (i = 0; i < dev->chunkBitmapStride; i++) {
333 * Simple hash function. Needs to have a reasonable spread
336 static Y_INLINE int yaffs_HashFunction(int n)
339 return (n % YAFFS_NOBJECT_BUCKETS);
343 * Access functions to useful fake objects
346 yaffs_Object *yaffs_Root(yaffs_Device * dev)
351 yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
353 return dev->lostNFoundDir;
358 * Erased NAND checking functions
361 int yaffs_CheckFF(__u8 * buffer, int nBytes)
363 /* Horrible, slow implementation */
372 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
376 int retval = YAFFS_OK;
377 __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
378 yaffs_ExtendedTags tags;
380 yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
382 if (!yaffs_CheckFF(data, dev->nBytesPerChunk) || tags.chunkUsed) {
383 T(YAFFS_TRACE_NANDACCESS,
384 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
388 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
394 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
396 yaffs_ExtendedTags * tags,
405 chunk = yaffs_AllocateChunk(dev, useReserve);
409 /* First check this chunk is erased... */
410 #ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
411 writeOk = yaffs_CheckChunkErased(dev, chunk);
416 ("**>> yaffs chunk %d was not erased"
420 yaffs_WriteChunkWithTagsToNAND(dev, chunk,
427 * Copy the data into the robustification buffer.
428 * NB We do this at the end to prevent duplicates in the case of a write error.
431 yaffs_HandleWriteChunkOk(dev, chunk, data,
434 yaffs_HandleWriteChunkError(dev, chunk);
438 } while (chunk >= 0 && !writeOk);
442 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
444 dev->nRetriedWrites += (attempts - 1);
451 * Block retiring for handling a broken block.
454 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
457 yaffs_MarkBlockBad(dev, blockInNAND);
459 yaffs_GetBlockInfo(dev, blockInNAND)->blockState =
460 YAFFS_BLOCK_STATE_DEAD;
462 dev->nRetiredBlocks++;
466 * Functions for robustisizing TODO
470 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
472 const yaffs_ExtendedTags * tags)
476 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
477 const yaffs_ExtendedTags * tags)
481 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND)
483 int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
485 /* Mark the block for retirement */
486 yaffs_GetBlockInfo(dev, blockInNAND)->needsRetiring = 1;
487 /* Delete the chunk */
488 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
492 /*---------------- Name handling functions ------------*/
494 static __u16 yaffs_CalcNameSum(const YCHAR * name)
499 YUCHAR *bname = (YUCHAR *) name;
501 while ((*bname) && (i <= YAFFS_MAX_NAME_LENGTH)) {
503 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
504 sum += yaffs_toupper(*bname) * i;
515 static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
517 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
518 if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
519 yaffs_strcpy(obj->shortName, name);
521 obj->shortName[0] = _Y('\0');
524 obj->sum = yaffs_CalcNameSum(name);
527 /*-------------------- TNODES -------------------
529 * List of spare tnodes
530 * The list is hooked together using the first pointer
534 /* yaffs_CreateTnodes creates a bunch more tnodes and
535 * adds them to the tnode free list.
536 * Don't use this function directly
539 static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
543 yaffs_Tnode *newTnodes;
547 yaffs_TnodeList *tnl;
552 /* Calculate the tnode size in bytes for variable width tnode support.
553 * Must be a multiple of 32-bits */
554 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
556 /* make these things */
558 newTnodes = YMALLOC(nTnodes * tnodeSize);
559 mem = (__u8 *)newTnodes;
563 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
567 /* Hook them into the free list */
569 for (i = 0; i < nTnodes - 1; i++) {
570 newTnodes[i].internal[0] = &newTnodes[i + 1];
571 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
572 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
576 newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
577 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
578 newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
580 dev->freeTnodes = newTnodes;
582 /* New hookup for wide tnodes */
583 for(i = 0; i < nTnodes -1; i++) {
584 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
585 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
586 curr->internal[0] = next;
589 curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
590 curr->internal[0] = dev->freeTnodes;
591 dev->freeTnodes = (yaffs_Tnode *)mem;
596 dev->nFreeTnodes += nTnodes;
597 dev->nTnodesCreated += nTnodes;
599 /* Now add this bunch of tnodes to a list for freeing up.
600 * NB If we can't add this to the management list it isn't fatal
601 * but it just means we can't free this bunch of tnodes later.
604 tnl = YMALLOC(sizeof(yaffs_TnodeList));
608 ("yaffs: Could not add tnodes to management list" TENDSTR)));
611 tnl->tnodes = newTnodes;
612 tnl->next = dev->allocatedTnodeList;
613 dev->allocatedTnodeList = tnl;
616 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
621 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
623 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
625 yaffs_Tnode *tn = NULL;
627 /* If there are none left make more */
628 if (!dev->freeTnodes) {
629 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
632 if (dev->freeTnodes) {
633 tn = dev->freeTnodes;
634 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
635 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
636 /* Hoosterman, this thing looks like it isn't in the list */
637 T(YAFFS_TRACE_ALWAYS,
638 (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
641 dev->freeTnodes = dev->freeTnodes->internal[0];
644 memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
650 /* FreeTnode frees up a tnode and puts it back on the free list */
651 static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
654 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
655 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
656 /* Hoosterman, this thing looks like it is already in the list */
657 T(YAFFS_TRACE_ALWAYS,
658 (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
660 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
662 tn->internal[0] = dev->freeTnodes;
663 dev->freeTnodes = tn;
668 static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
670 /* Free the list of allocated tnodes */
671 yaffs_TnodeList *tmp;
673 while (dev->allocatedTnodeList) {
674 tmp = dev->allocatedTnodeList->next;
676 YFREE(dev->allocatedTnodeList->tnodes);
677 YFREE(dev->allocatedTnodeList);
678 dev->allocatedTnodeList = tmp;
682 dev->freeTnodes = NULL;
683 dev->nFreeTnodes = 0;
686 static void yaffs_InitialiseTnodes(yaffs_Device * dev)
688 dev->allocatedTnodeList = NULL;
689 dev->freeTnodes = NULL;
690 dev->nFreeTnodes = 0;
691 dev->nTnodesCreated = 0;
696 void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
698 __u32 *map = (__u32 *)tn;
704 pos &= YAFFS_TNODES_LEVEL0_MASK;
705 val >>= dev->chunkGroupBits;
707 bitInMap = pos * dev->tnodeWidth;
708 wordInMap = bitInMap /32;
709 bitInWord = bitInMap & (32 -1);
711 mask = dev->tnodeMask << bitInWord;
713 map[wordInMap] &= ~mask;
714 map[wordInMap] |= (mask & (val << bitInWord));
716 if(dev->tnodeWidth > (32-bitInWord)) {
717 bitInWord = (32 - bitInWord);
719 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
720 map[wordInMap] &= ~mask;
721 map[wordInMap] |= (mask & (val >> bitInWord));
725 __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
727 __u32 *map = (__u32 *)tn;
733 pos &= YAFFS_TNODES_LEVEL0_MASK;
735 bitInMap = pos * dev->tnodeWidth;
736 wordInMap = bitInMap /32;
737 bitInWord = bitInMap & (32 -1);
739 val = map[wordInMap] >> bitInWord;
741 if(dev->tnodeWidth > (32-bitInWord)) {
742 bitInWord = (32 - bitInWord);
744 val |= (map[wordInMap] << bitInWord);
747 val &= dev->tnodeMask;
748 val <<= dev->chunkGroupBits;
753 /* ------------------- End of individual tnode manipulation -----------------*/
755 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
756 * The look up tree is represented by the top tnode and the number of topLevel
757 * in the tree. 0 means only the level 0 tnode is in the tree.
760 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
761 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
762 yaffs_FileStructure * fStruct,
766 yaffs_Tnode *tn = fStruct->top;
768 int requiredTallness;
769 int level = fStruct->topLevel;
771 /* Check sane level and chunk Id */
772 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
776 if (chunkId > YAFFS_MAX_CHUNK_ID) {
780 /* First check we're tall enough (ie enough topLevel) */
782 i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
783 requiredTallness = 0;
785 i >>= YAFFS_TNODES_INTERNAL_BITS;
789 if (requiredTallness > fStruct->topLevel) {
790 /* Not tall enough, so we can't find it, return NULL. */
794 /* Traverse down to level 0 */
795 while (level > 0 && tn) {
798 ( YAFFS_TNODES_LEVEL0_BITS +
800 YAFFS_TNODES_INTERNAL_BITS)
802 YAFFS_TNODES_INTERNAL_MASK];
810 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
811 * This happens in two steps:
812 * 1. If the tree isn't tall enough, then make it taller.
813 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
815 * Used when modifying the tree.
818 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
819 yaffs_FileStructure * fStruct,
825 int requiredTallness;
832 /* Check sane level and page Id */
833 if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
837 if (chunkId > YAFFS_MAX_CHUNK_ID) {
841 /* First check we're tall enough (ie enough topLevel) */
843 x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
844 requiredTallness = 0;
846 x >>= YAFFS_TNODES_INTERNAL_BITS;
851 if (requiredTallness > fStruct->topLevel) {
852 /* Not tall enough,gotta make the tree taller */
853 for (i = fStruct->topLevel; i < requiredTallness; i++) {
855 tn = yaffs_GetTnode(dev);
858 tn->internal[0] = fStruct->top;
862 (TSTR("yaffs: no more tnodes" TENDSTR)));
866 fStruct->topLevel = requiredTallness;
869 /* Traverse down to level 0, adding anything we need */
871 l = fStruct->topLevel;
873 while (l > 0 && tn) {
875 ( YAFFS_TNODES_LEVEL0_BITS +
876 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
877 YAFFS_TNODES_INTERNAL_MASK;
880 if (!tn->internal[x])
881 tn->internal[x] = yaffs_GetTnode(dev);
883 tn = tn->internal[x];
891 static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
892 yaffs_ExtendedTags * tags, int objectId,
897 for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
898 if (yaffs_CheckChunkBit
899 (dev, theChunk / dev->nChunksPerBlock,
900 theChunk % dev->nChunksPerBlock)) {
901 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
903 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
915 /* DeleteWorker scans backwards through the tnode tree and deletes all the
916 * chunks and tnodes in the file
917 * Returns 1 if the tree was deleted.
918 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
921 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
922 int chunkOffset, int *limit)
927 yaffs_ExtendedTags tags;
929 yaffs_Device *dev = in->myDev;
936 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
938 if (tn->internal[i]) {
939 if (limit && (*limit) < 0) {
943 yaffs_DeleteWorker(in,
951 YAFFS_TNODES_INTERNAL_BITS)
959 tn->internal[i] = NULL;
964 return (allDone) ? 1 : 0;
965 } else if (level == 0) {
968 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
970 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
975 YAFFS_TNODES_LEVEL0_BITS) + i;
978 yaffs_FindChunkInGroup(dev,
984 if (foundChunk > 0) {
985 yaffs_DeleteChunk(dev,
998 yaffs_PutLevel0Tnode(dev,tn,i,0);
1002 return (i < 0) ? 1 : 0;
1012 static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
1015 yaffs_BlockInfo *theBlock;
1017 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1019 theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1021 theBlock->softDeletions++;
1026 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1027 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1029 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1032 static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
1033 __u32 level, int chunkOffset)
1038 yaffs_Device *dev = in->myDev;
1043 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1045 if (tn->internal[i]) {
1047 yaffs_SoftDeleteWorker(in,
1053 YAFFS_TNODES_INTERNAL_BITS)
1056 yaffs_FreeTnode(dev,
1059 tn->internal[i] = NULL;
1061 /* Hoosterman... how could this happen? */
1065 return (allDone) ? 1 : 0;
1066 } else if (level == 0) {
1068 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1069 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
1071 /* Note this does not find the real chunk, only the chunk group.
1072 * We make an assumption that a chunk group is not larger than
1075 yaffs_SoftDeleteChunk(dev, theChunk);
1076 yaffs_PutLevel0Tnode(dev,tn,i,0);
1090 static void yaffs_SoftDeleteFile(yaffs_Object * obj)
1093 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1094 if (obj->nDataChunks <= 0) {
1095 /* Empty file with no duplicate object headers, just delete it immediately */
1096 yaffs_FreeTnode(obj->myDev,
1097 obj->variant.fileVariant.top);
1098 obj->variant.fileVariant.top = NULL;
1099 T(YAFFS_TRACE_TRACING,
1100 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1102 yaffs_DoGenericObjectDeletion(obj);
1104 yaffs_SoftDeleteWorker(obj,
1105 obj->variant.fileVariant.top,
1106 obj->variant.fileVariant.
1108 obj->softDeleted = 1;
1113 /* Pruning removes any part of the file structure tree that is beyond the
1114 * bounds of the file (ie that does not point to chunks).
1116 * A file should only get pruned when its size is reduced.
1118 * Before pruning, the chunks must be pulled from the tree and the
1119 * level 0 tnode entries must be zeroed out.
1120 * Could also use this for file deletion, but that's probably better handled
1121 * by a special case.
1124 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
1125 __u32 level, int del0)
1133 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1134 if (tn->internal[i] && level > 0) {
1136 yaffs_PruneWorker(dev, tn->internal[i],
1138 (i == 0) ? del0 : 1);
1141 if (tn->internal[i]) {
1146 if (hasData == 0 && del0) {
1147 /* Free and return NULL */
1149 yaffs_FreeTnode(dev, tn);
1159 static int yaffs_PruneFileStructure(yaffs_Device * dev,
1160 yaffs_FileStructure * fStruct)
1167 if (fStruct->topLevel > 0) {
1169 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1171 /* Now we have a tree with all the non-zero branches NULL but the height
1172 * is the same as it was.
1173 * Let's see if we can trim internal tnodes to shorten the tree.
1174 * We can do this if only the 0th element in the tnode is in use
1175 * (ie all the non-zero are NULL)
1178 while (fStruct->topLevel && !done) {
1182 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1183 if (tn->internal[i]) {
1189 fStruct->top = tn->internal[0];
1190 fStruct->topLevel--;
1191 yaffs_FreeTnode(dev, tn);
1201 /*-------------------- End of File Structure functions.-------------------*/
1203 /* yaffs_CreateFreeObjects creates a bunch more objects and
1204 * adds them to the object free list.
1206 static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
1209 yaffs_Object *newObjects;
1210 yaffs_ObjectList *list;
1215 /* make these things */
1216 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1219 T(YAFFS_TRACE_ALLOCATE,
1220 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1224 /* Hook them into the free list */
1225 for (i = 0; i < nObjects - 1; i++) {
1226 newObjects[i].siblings.next =
1227 (struct list_head *)(&newObjects[i + 1]);
1230 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1231 dev->freeObjects = newObjects;
1232 dev->nFreeObjects += nObjects;
1233 dev->nObjectsCreated += nObjects;
1235 /* Now add this bunch of Objects to a list for freeing up. */
1237 list = YMALLOC(sizeof(yaffs_ObjectList));
1239 T(YAFFS_TRACE_ALLOCATE,
1240 (TSTR("Could not add objects to management list" TENDSTR)));
1242 list->objects = newObjects;
1243 list->next = dev->allocatedObjectList;
1244 dev->allocatedObjectList = list;
1251 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1252 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
1254 yaffs_Object *tn = NULL;
1256 /* If there are none left make more */
1257 if (!dev->freeObjects) {
1258 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1261 if (dev->freeObjects) {
1262 tn = dev->freeObjects;
1264 (yaffs_Object *) (dev->freeObjects->siblings.next);
1265 dev->nFreeObjects--;
1267 /* Now sweeten it up... */
1269 memset(tn, 0, sizeof(yaffs_Object));
1272 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1273 INIT_LIST_HEAD(&(tn->hardLinks));
1274 INIT_LIST_HEAD(&(tn->hashLink));
1275 INIT_LIST_HEAD(&tn->siblings);
1277 /* Add it to the lost and found directory.
1278 * NB Can't put root or lostNFound in lostNFound so
1279 * check if lostNFound exists first
1281 if (dev->lostNFoundDir) {
1282 yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1289 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
1294 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1296 obj->fake = 1; /* it is fake so it has no NAND presence... */
1297 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1298 obj->unlinkAllowed = 0; /* ... or unlink it */
1301 obj->yst_mode = mode;
1303 obj->chunkId = 0; /* Not a valid chunk. */
1310 static void yaffs_UnhashObject(yaffs_Object * tn)
1313 yaffs_Device *dev = tn->myDev;
1315 /* If it is still linked into the bucket list, free from the list */
1316 if (!list_empty(&tn->hashLink)) {
1317 list_del_init(&tn->hashLink);
1318 bucket = yaffs_HashFunction(tn->objectId);
1319 dev->objectBucket[bucket].count--;
1324 /* FreeObject frees up a Object and puts it back on the free list */
1325 static void yaffs_FreeObject(yaffs_Object * tn)
1328 yaffs_Device *dev = tn->myDev;
1332 /* We're still hooked up to a cached inode.
1333 * Don't delete now, but mark for later deletion
1335 tn->deferedFree = 1;
1340 yaffs_UnhashObject(tn);
1342 /* Link into the free list. */
1343 tn->siblings.next = (struct list_head *)(dev->freeObjects);
1344 dev->freeObjects = tn;
1345 dev->nFreeObjects++;
1350 void yaffs_HandleDeferedFree(yaffs_Object * obj)
1352 if (obj->deferedFree) {
1353 yaffs_FreeObject(obj);
1359 static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
1361 /* Free the list of allocated Objects */
1363 yaffs_ObjectList *tmp;
1365 while (dev->allocatedObjectList) {
1366 tmp = dev->allocatedObjectList->next;
1367 YFREE(dev->allocatedObjectList->objects);
1368 YFREE(dev->allocatedObjectList);
1370 dev->allocatedObjectList = tmp;
1373 dev->freeObjects = NULL;
1374 dev->nFreeObjects = 0;
1377 static void yaffs_InitialiseObjects(yaffs_Device * dev)
1381 dev->allocatedObjectList = NULL;
1382 dev->freeObjects = NULL;
1383 dev->nFreeObjects = 0;
1385 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
1386 INIT_LIST_HEAD(&dev->objectBucket[i].list);
1387 dev->objectBucket[i].count = 0;
1392 static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
1397 int lowest = 999999;
1399 /* First let's see if we can find one that's empty. */
1401 for (i = 0; i < 10 && lowest > 0; i++) {
1403 x %= YAFFS_NOBJECT_BUCKETS;
1404 if (dev->objectBucket[x].count < lowest) {
1405 lowest = dev->objectBucket[x].count;
1411 /* If we didn't find an empty list, then try
1412 * looking a bit further for a short one
1415 for (i = 0; i < 10 && lowest > 3; i++) {
1417 x %= YAFFS_NOBJECT_BUCKETS;
1418 if (dev->objectBucket[x].count < lowest) {
1419 lowest = dev->objectBucket[x].count;
1428 static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
1430 int bucket = yaffs_FindNiceObjectBucket(dev);
1432 /* Now find an object value that has not already been taken
1433 * by scanning the list.
1437 struct list_head *i;
1439 __u32 n = (__u32) bucket;
1441 /* yaffs_CheckObjectHashSanity(); */
1445 n += YAFFS_NOBJECT_BUCKETS;
1446 if (1 || dev->objectBucket[bucket].count > 0) {
1447 list_for_each(i, &dev->objectBucket[bucket].list) {
1448 /* If there is already one in the list */
1450 && list_entry(i, yaffs_Object,
1451 hashLink)->objectId == n) {
1462 static void yaffs_HashObject(yaffs_Object * in)
1464 int bucket = yaffs_HashFunction(in->objectId);
1465 yaffs_Device *dev = in->myDev;
1467 list_add(&in->hashLink, &dev->objectBucket[bucket].list);
1468 dev->objectBucket[bucket].count++;
1472 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
1474 int bucket = yaffs_HashFunction(number);
1475 struct list_head *i;
1478 list_for_each(i, &dev->objectBucket[bucket].list) {
1479 /* Look if it is in the list */
1481 in = list_entry(i, yaffs_Object, hashLink);
1482 if (in->objectId == number) {
1484 /* Don't tell the VFS about this one if it is defered free */
1485 if (in->deferedFree)
1497 yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
1498 yaffs_ObjectType type)
1501 yaffs_Object *theObject;
1504 number = yaffs_CreateNewObjectNumber(dev);
1507 theObject = yaffs_AllocateEmptyObject(dev);
1510 theObject->fake = 0;
1511 theObject->renameAllowed = 1;
1512 theObject->unlinkAllowed = 1;
1513 theObject->objectId = number;
1514 yaffs_HashObject(theObject);
1515 theObject->variantType = type;
1516 #ifdef CONFIG_YAFFS_WINCE
1517 yfsd_WinFileTimeNow(theObject->win_atime);
1518 theObject->win_ctime[0] = theObject->win_mtime[0] =
1519 theObject->win_atime[0];
1520 theObject->win_ctime[1] = theObject->win_mtime[1] =
1521 theObject->win_atime[1];
1525 theObject->yst_atime = theObject->yst_mtime =
1526 theObject->yst_ctime = Y_CURRENT_TIME;
1529 case YAFFS_OBJECT_TYPE_FILE:
1530 theObject->variant.fileVariant.fileSize = 0;
1531 theObject->variant.fileVariant.scannedFileSize = 0;
1532 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
1533 theObject->variant.fileVariant.topLevel = 0;
1534 theObject->variant.fileVariant.top =
1535 yaffs_GetTnode(dev);
1537 case YAFFS_OBJECT_TYPE_DIRECTORY:
1538 INIT_LIST_HEAD(&theObject->variant.directoryVariant.
1541 case YAFFS_OBJECT_TYPE_SYMLINK:
1542 case YAFFS_OBJECT_TYPE_HARDLINK:
1543 case YAFFS_OBJECT_TYPE_SPECIAL:
1544 /* No action required */
1546 case YAFFS_OBJECT_TYPE_UNKNOWN:
1547 /* todo this should not happen */
1555 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
1557 yaffs_ObjectType type)
1559 yaffs_Object *theObject = NULL;
1562 theObject = yaffs_FindObjectByNumber(dev, number);
1566 theObject = yaffs_CreateNewObject(dev, number, type);
1573 static YCHAR *yaffs_CloneString(const YCHAR * str)
1575 YCHAR *newStr = NULL;
1578 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
1579 yaffs_strcpy(newStr, str);
1587 * Mknod (create) a new object.
1588 * equivalentObject only has meaning for a hard link;
1589 * aliasString only has meaning for a sumlink.
1590 * rdev only has meaning for devices (a subset of special objects)
1593 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
1594 yaffs_Object * parent,
1599 yaffs_Object * equivalentObject,
1600 const YCHAR * aliasString, __u32 rdev)
1604 yaffs_Device *dev = parent->myDev;
1606 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
1607 if (yaffs_FindObjectByName(parent, name)) {
1611 in = yaffs_CreateNewObject(dev, -1, type);
1616 in->variantType = type;
1618 in->yst_mode = mode;
1620 #ifdef CONFIG_YAFFS_WINCE
1621 yfsd_WinFileTimeNow(in->win_atime);
1622 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
1623 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
1626 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
1628 in->yst_rdev = rdev;
1632 in->nDataChunks = 0;
1634 yaffs_SetObjectName(in, name);
1637 yaffs_AddObjectToDirectory(parent, in);
1639 in->myDev = parent->myDev;
1642 case YAFFS_OBJECT_TYPE_SYMLINK:
1643 in->variant.symLinkVariant.alias =
1644 yaffs_CloneString(aliasString);
1646 case YAFFS_OBJECT_TYPE_HARDLINK:
1647 in->variant.hardLinkVariant.equivalentObject =
1649 in->variant.hardLinkVariant.equivalentObjectId =
1650 equivalentObject->objectId;
1651 list_add(&in->hardLinks, &equivalentObject->hardLinks);
1653 case YAFFS_OBJECT_TYPE_FILE:
1654 case YAFFS_OBJECT_TYPE_DIRECTORY:
1655 case YAFFS_OBJECT_TYPE_SPECIAL:
1656 case YAFFS_OBJECT_TYPE_UNKNOWN:
1661 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
1662 /* Could not create the object header, fail the creation */
1663 yaffs_DestroyObject(in);
1672 yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
1673 __u32 mode, __u32 uid, __u32 gid)
1675 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
1676 uid, gid, NULL, NULL, 0);
1679 yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
1680 __u32 mode, __u32 uid, __u32 gid)
1682 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
1683 mode, uid, gid, NULL, NULL, 0);
1686 yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
1687 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
1689 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
1690 uid, gid, NULL, NULL, rdev);
1693 yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
1694 __u32 mode, __u32 uid, __u32 gid,
1695 const YCHAR * alias)
1697 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
1698 uid, gid, NULL, alias, 0);
1701 /* yaffs_Link returns the object id of the equivalent object.*/
1702 yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
1703 yaffs_Object * equivalentObject)
1705 /* Get the real object in case we were fed a hard link as an equivalent object */
1706 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
1708 if (yaffs_MknodObject
1709 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
1710 equivalentObject, NULL, 0)) {
1711 return equivalentObject;
1718 static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
1719 const YCHAR * newName, int force, int shadows)
1724 yaffs_Object *existingTarget;
1726 if (newDir == NULL) {
1727 newDir = obj->parent; /* use the old directory */
1730 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
1731 T(YAFFS_TRACE_ALWAYS,
1733 ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
1738 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
1739 if (obj->myDev->isYaffs2) {
1740 unlinkOp = (newDir == obj->myDev->unlinkedDir);
1742 unlinkOp = (newDir == obj->myDev->unlinkedDir
1743 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
1746 deleteOp = (newDir == obj->myDev->deletedDir);
1748 existingTarget = yaffs_FindObjectByName(newDir, newName);
1750 /* If the object is a file going into the unlinked directory,
1751 * then it is OK to just stuff it in since duplicate names are allowed.
1752 * else only proceed if the new name does not exist and if we're putting
1753 * it into a directory.
1760 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
1761 yaffs_SetObjectName(obj, newName);
1764 yaffs_AddObjectToDirectory(newDir, obj);
1769 /* If it is a deletion then we mark it as a shrink for gc purposes. */
1770 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
1777 int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
1778 yaffs_Object * newDir, const YCHAR * newName)
1781 yaffs_Object *existingTarget;
1784 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1785 /* Special case for case insemsitive systems (eg. WinCE).
1786 * While look-up is case insensitive, the name isn't.
1787 * Therefore we might want to change x.txt to X.txt
1789 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
1794 obj = yaffs_FindObjectByName(oldDir, oldName);
1796 if (obj && obj->renameAllowed) {
1798 /* Now do the handling for an existing target, if there is one */
1800 existingTarget = yaffs_FindObjectByName(newDir, newName);
1801 if (existingTarget &&
1802 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1803 !list_empty(&existingTarget->variant.directoryVariant.children)) {
1804 /* There is a target that is a non-empty directory, so we fail */
1805 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
1806 } else if (existingTarget && existingTarget != obj) {
1807 /* Nuke the target first, using shadowing,
1808 * but only if it isn't the same object
1810 yaffs_ChangeObjectName(obj, newDir, newName, force,
1811 existingTarget->objectId);
1812 yaffs_UnlinkObject(existingTarget);
1815 return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
1820 /*------------------------- Block Management and Page Allocation ----------------*/
1822 static int yaffs_InitialiseBlocks(yaffs_Device * dev, int nBlocks)
1824 dev->allocationBlock = -1; /* force it to get a new one */
1826 /* Todo we're assuming the malloc will pass. */
1827 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
1828 if(!dev->blockInfo){
1829 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
1830 dev->blockInfoAlt = 1;
1833 dev->blockInfoAlt = 0;
1835 /* Set up dynamic blockinfo stuff. */
1836 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8;
1837 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
1838 if(!dev->chunkBits){
1839 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
1840 dev->chunkBitsAlt = 1;
1843 dev->chunkBitsAlt = 0;
1845 if (dev->blockInfo && dev->chunkBits) {
1846 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
1847 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
1855 static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
1857 if(dev->blockInfoAlt)
1858 YFREE_ALT(dev->blockInfo);
1860 YFREE(dev->blockInfo);
1861 dev->blockInfoAlt = 0;
1863 dev->blockInfo = NULL;
1865 if(dev->chunkBitsAlt)
1866 YFREE_ALT(dev->chunkBits);
1868 YFREE(dev->chunkBits);
1869 dev->chunkBitsAlt = 0;
1870 dev->chunkBits = NULL;
1873 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
1874 yaffs_BlockInfo * bi)
1881 return 1; /* disqualification only applies to yaffs2. */
1883 if (!bi->hasShrinkHeader)
1884 return 1; /* can gc */
1886 /* Find the oldest dirty sequence number if we don't know it and save it
1887 * so we don't have to keep recomputing it.
1889 if (!dev->oldestDirtySequence) {
1890 seq = dev->sequenceNumber;
1892 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
1894 b = yaffs_GetBlockInfo(dev, i);
1895 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
1896 (b->pagesInUse - b->softDeletions) <
1897 dev->nChunksPerBlock && b->sequenceNumber < seq) {
1898 seq = b->sequenceNumber;
1901 dev->oldestDirtySequence = seq;
1904 /* Can't do gc of this block if there are any blocks older than this one that have
1907 return (bi->sequenceNumber <= dev->oldestDirtySequence);
1913 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
1914 * for garbage collection.
1917 static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
1921 int b = dev->currentDirtyChecker;
1927 yaffs_BlockInfo *bi;
1928 static int nonAggressiveSkip = 0;
1930 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
1932 * else (we're doing a leasurely gc), then we only bother to do this if the
1933 * block has only a few pages in use.
1936 nonAggressiveSkip--;
1938 if (!aggressive && (nonAggressiveSkip > 0)) {
1943 (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
1947 dev->internalEndBlock - dev->internalStartBlock + 1;
1950 dev->internalEndBlock - dev->internalStartBlock + 1;
1951 iterations = iterations / 16;
1952 if (iterations > 200) {
1957 for (i = 0; i <= iterations && pagesInUse > 0; i++) {
1959 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
1960 b = dev->internalStartBlock;
1963 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
1964 T(YAFFS_TRACE_ERROR,
1965 (TSTR("**>> Block %d is not valid" TENDSTR), b));
1969 bi = yaffs_GetBlockInfo(dev, b);
1971 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
1972 (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
1973 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
1975 pagesInUse = (bi->pagesInUse - bi->softDeletions);
1979 dev->currentDirtyChecker = b;
1983 (TSTR("GC Selected block %d with %d free" TENDSTR), dirtiest,
1984 dev->nChunksPerBlock - pagesInUse));
1987 dev->oldestDirtySequence = 0;
1990 nonAggressiveSkip = 4;
1996 static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
1998 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2002 /* If the block is still healthy erase it and mark as clean.
2003 * If the block has had a data failure, then retire it.
2005 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2007 if (!bi->needsRetiring) {
2008 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2010 dev->nErasureFailures++;
2011 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2012 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2016 if (erasedOk && (yaffs_traceMask & YAFFS_TRACE_ERASE)) {
2018 for (i = 0; i < dev->nChunksPerBlock; i++) {
2019 if (!yaffs_CheckChunkErased
2020 (dev, blockNo * dev->nChunksPerBlock + i)) {
2021 T(YAFFS_TRACE_ERROR,
2023 (">>Block %d erasure supposedly OK, but chunk %d not erased"
2024 TENDSTR), blockNo, i));
2030 /* Clean it up... */
2031 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2032 dev->nErasedBlocks++;
2034 bi->softDeletions = 0;
2035 bi->hasShrinkHeader = 0;
2036 yaffs_ClearChunkBits(dev, blockNo);
2038 T(YAFFS_TRACE_ERASE,
2039 (TSTR("Erased block %d" TENDSTR), blockNo));
2041 dev->nFreeChunks -= dev->nChunksPerBlock; /* We lost a block of free space */
2043 yaffs_RetireBlock(dev, blockNo);
2044 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2045 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2049 static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
2053 yaffs_BlockInfo *bi;
2055 if (dev->nErasedBlocks < 1) {
2056 /* Hoosterman we've got a problem.
2057 * Can't get space to gc
2059 T(YAFFS_TRACE_ERROR,
2060 (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
2065 /* Find an empty block. */
2067 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2068 dev->allocationBlockFinder++;
2069 if (dev->allocationBlockFinder < dev->internalStartBlock
2070 || dev->allocationBlockFinder > dev->internalEndBlock) {
2071 dev->allocationBlockFinder = dev->internalStartBlock;
2074 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2076 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2077 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2078 dev->sequenceNumber++;
2079 bi->sequenceNumber = dev->sequenceNumber;
2080 dev->nErasedBlocks--;
2081 T(YAFFS_TRACE_ALLOCATE,
2082 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
2083 dev->allocationBlockFinder, dev->sequenceNumber,
2084 dev->nErasedBlocks));
2085 return dev->allocationBlockFinder;
2089 T(YAFFS_TRACE_ALWAYS,
2091 ("yaffs tragedy: no more eraased blocks, but there should have been %d"
2092 TENDSTR), dev->nErasedBlocks));
2099 static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
2101 int reservedChunks = (dev->nReservedBlocks * dev->nChunksPerBlock);
2102 return (dev->nFreeChunks > reservedChunks);
2105 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve)
2108 yaffs_BlockInfo *bi;
2110 if (dev->allocationBlock < 0) {
2111 /* Get next block to allocate off */
2112 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2113 dev->allocationPage = 0;
2116 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2117 /* Not enough space to allocate unless we're allowed to use the reserve. */
2121 if (dev->nErasedBlocks < dev->nReservedBlocks
2122 && dev->allocationPage == 0) {
2123 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2126 /* Next page please.... */
2127 if (dev->allocationBlock >= 0) {
2128 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2130 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2131 dev->allocationPage;
2133 yaffs_SetChunkBit(dev, dev->allocationBlock,
2134 dev->allocationPage);
2136 dev->allocationPage++;
2140 /* If the block is full set the state to full */
2141 if (dev->allocationPage >= dev->nChunksPerBlock) {
2142 bi->blockState = YAFFS_BLOCK_STATE_FULL;
2143 dev->allocationBlock = -1;
2149 T(YAFFS_TRACE_ERROR,
2150 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2155 static int yaffs_GetErasedChunks(yaffs_Device * dev)
2159 n = dev->nErasedBlocks * dev->nChunksPerBlock;
2161 if (dev->allocationBlock > 0) {
2162 n += (dev->nChunksPerBlock - dev->allocationPage);
2169 static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
2175 int retVal = YAFFS_OK;
2179 int chunksBefore = yaffs_GetErasedChunks(dev);
2182 yaffs_ExtendedTags tags;
2184 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2186 yaffs_Object *object;
2188 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2190 T(YAFFS_TRACE_TRACING,
2191 (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
2192 bi->pagesInUse, bi->hasShrinkHeader));
2194 /*yaffs_VerifyFreeChunks(dev); */
2196 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
2198 /* Take off the number of soft deleted entries because
2199 * they're going to get really deleted during GC.
2201 dev->nFreeChunks -= bi->softDeletions;
2205 if (!yaffs_StillSomeChunkBits(dev, block)) {
2206 T(YAFFS_TRACE_TRACING,
2208 ("Collecting block %d that has no chunks in use" TENDSTR),
2210 yaffs_BlockBecameDirty(dev, block);
2213 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
2215 for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
2216 chunkInBlock < dev->nChunksPerBlock
2217 && yaffs_StillSomeChunkBits(dev, block);
2218 chunkInBlock++, oldChunk++) {
2219 if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
2221 /* This page is in use and might need to be copied off */
2225 yaffs_InitialiseTags(&tags);
2227 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
2231 yaffs_FindObjectByNumber(dev,
2234 T(YAFFS_TRACE_GC_DETAIL,
2236 ("Collecting page %d, %d %d %d " TENDSTR),
2237 chunkInBlock, tags.objectId, tags.chunkId,
2241 T(YAFFS_TRACE_ERROR,
2243 ("page %d in gc has no object "
2244 TENDSTR), oldChunk));
2247 if (object && object->deleted
2248 && tags.chunkId != 0) {
2249 /* Data chunk in a deleted file, throw it away
2250 * It's a soft deleted data chunk,
2251 * No need to copy this, just forget about it and
2252 * fix up the object.
2255 object->nDataChunks--;
2257 if (object->nDataChunks <= 0) {
2258 /* remeber to clean up the object */
2259 dev->gcCleanupList[cleanups] =
2265 /* Todo object && object->deleted && object->nDataChunks == 0 */
2267 /* Deleted object header with no data chunks.
2268 * Can be discarded and the file deleted.
2270 object->chunkId = 0;
2271 yaffs_FreeTnode(object->myDev,
2274 object->variant.fileVariant.top = NULL;
2275 yaffs_DoGenericObjectDeletion(object);
2277 } else if (object) {
2278 /* It's either a data chunk in a live file or
2279 * an ObjectHeader, so we're interested in it.
2280 * NB Need to keep the ObjectHeaders of deleted files
2281 * until the whole file has been deleted off
2283 tags.serialNumber++;
2287 if (tags.chunkId == 0) {
2288 /* It is an object Id,
2289 * We need to nuke the shrinkheader flags first
2290 * We no longer want the shrinkHeader flag since its work is done
2291 * and if it is left in place it will mess up scanning.
2292 * Also, clear out any shadowing stuff
2295 yaffs_ObjectHeader *oh;
2296 oh = (yaffs_ObjectHeader *)buffer;
2298 oh->shadowsObject = -1;
2299 tags.extraShadows = 0;
2300 tags.extraIsShrinkHeader = 0;
2304 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
2307 retVal = YAFFS_FAIL;
2310 /* Ok, now fix up the Tnodes etc. */
2312 if (tags.chunkId == 0) {
2314 object->chunkId = newChunk;
2315 object->serial = tags.serialNumber;
2317 /* It's a data chunk */
2318 yaffs_PutChunkIntoFile
2326 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
2331 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
2334 /* Do any required cleanups */
2335 for (i = 0; i < cleanups; i++) {
2336 /* Time to delete the file too */
2338 yaffs_FindObjectByNumber(dev,
2339 dev->gcCleanupList[i]);
2341 yaffs_FreeTnode(dev,
2342 object->variant.fileVariant.
2344 object->variant.fileVariant.top = NULL;
2347 ("yaffs: About to finally delete object %d"
2348 TENDSTR), object->objectId));
2349 yaffs_DoGenericObjectDeletion(object);
2356 if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
2359 ("gc did not increase free chunks before %d after %d"
2360 TENDSTR), chunksBefore, chunksAfter));
2368 /* New garbage collector
2369 * If we're very low on erased blocks then we do aggressive garbage collection
2370 * otherwise we do "leasurely" garbage collection.
2371 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2372 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
2374 * The idea is to help clear out space in a more spread-out manner.
2375 * Dunno if it really does anything useful.
2377 static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
2381 int gcOk = YAFFS_OK;
2384 if (dev->isDoingGC) {
2385 /* Bail out so we don't get recursive gc */
2389 /* This loop should pass the first time.
2390 * We'll only see looping here if the erase of the collected block fails.
2395 if (dev->nErasedBlocks < dev->nReservedBlocks) {
2396 /* We need a block soon...*/
2399 /* We're in no hurry */
2403 block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
2406 dev->garbageCollections++;
2408 dev->passiveGarbageCollections++;
2413 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
2414 dev->nErasedBlocks, aggressive));
2416 gcOk = yaffs_GarbageCollectBlock(dev, block);
2419 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
2422 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
2423 TENDSTR), dev->nErasedBlocks, maxTries, block));
2425 } while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
2428 return aggressive ? gcOk : YAFFS_OK;
2431 /*------------------------- TAGS --------------------------------*/
2433 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
2436 return (tags->chunkId == chunkInObject &&
2437 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
2442 /*-------------------- Data file manipulation -----------------*/
2444 static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
2445 yaffs_ExtendedTags * tags)
2447 /*Get the Tnode, then get the level 0 offset chunk offset */
2450 yaffs_ExtendedTags localTags;
2453 yaffs_Device *dev = in->myDev;
2456 /* Passed a NULL, so use our own tags space */
2460 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
2463 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
2466 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
2472 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
2473 yaffs_ExtendedTags * tags)
2475 /* Get the Tnode, then get the level 0 offset chunk offset */
2478 yaffs_ExtendedTags localTags;
2480 yaffs_Device *dev = in->myDev;
2484 /* Passed a NULL, so use our own tags space */
2488 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
2492 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
2495 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
2498 /* Delete the entry in the filestructure (if found) */
2500 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
2503 /*T(("No level 0 found for %d\n", chunkInInode)); */
2507 /* T(("Could not find %d to delete\n",chunkInInode)); */
2512 #ifdef YAFFS_PARANOID
2514 static int yaffs_CheckFileSanity(yaffs_Object * in)
2522 yaffs_Tags localTags;
2523 yaffs_Tags *tags = &localTags;
2527 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
2528 /* T(("Object not a file\n")); */
2532 objId = in->objectId;
2533 fSize = in->variant.fileVariant.fileSize;
2535 (fSize + in->myDev->nBytesPerChunk - 1) / in->myDev->nBytesPerChunk;
2537 for (chunk = 1; chunk <= nChunks; chunk++) {
2538 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
2543 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
2545 if (yaffs_CheckChunkBits
2546 (dev, theChunk / dev->nChunksPerBlock,
2547 theChunk % dev->nChunksPerBlock)) {
2549 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
2553 (tags, in->objectId, chunk, chunkDeleted)) {
2563 /* T(("No level 0 found for %d\n", chunk)); */
2567 return failed ? YAFFS_FAIL : YAFFS_OK;
2572 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
2573 int chunkInNAND, int inScan)
2575 /* NB inScan is zero unless scanning.
2576 * For forward scanning, inScan is > 0;
2577 * for backward scanning inScan is < 0
2581 yaffs_Device *dev = in->myDev;
2583 yaffs_ExtendedTags existingTags;
2584 yaffs_ExtendedTags newTags;
2585 unsigned existingSerial, newSerial;
2587 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
2588 /* Just ignore an attempt at putting a chunk into a non-file during scanning
2589 * If it is not during Scanning then something went wrong!
2592 T(YAFFS_TRACE_ERROR,
2594 ("yaffs tragedy:attempt to put data chunk into a non-file"
2599 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
2603 tn = yaffs_AddOrFindLevel0Tnode(dev, &in->variant.fileVariant,
2609 existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
2612 /* If we're scanning then we need to test for duplicates
2613 * NB This does not need to be efficient since it should only ever
2614 * happen when the power fails during a write, then only one
2615 * chunk should ever be affected.
2617 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
2618 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
2621 if (existingChunk != 0) {
2622 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
2623 * thus we have to do a FindChunkInFile to get the real chunk id.
2625 * We have a duplicate now we need to decide which one to use:
2627 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
2628 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
2629 * YAFFS1: Get both sets of tags and compare serial numbers.
2633 /* Only do this for forward scanning */
2634 yaffs_ReadChunkWithTagsFromNAND(dev,
2638 /* Do a proper find */
2640 yaffs_FindChunkInFile(in, chunkInInode,
2644 if (existingChunk <= 0) {
2645 /*Hoosterman - how did this happen? */
2647 T(YAFFS_TRACE_ERROR,
2649 ("yaffs tragedy: existing chunk < 0 in scan"
2654 /* NB The deleted flags should be false, otherwise the chunks will
2655 * not be loaded during a scan
2658 newSerial = newTags.serialNumber;
2659 existingSerial = existingTags.serialNumber;
2662 (in->myDev->isYaffs2 ||
2663 existingChunk <= 0 ||
2664 ((existingSerial + 1) & 3) == newSerial)) {
2665 /* Forward scanning.
2667 * Delete the old one and drop through to update the tnode
2669 yaffs_DeleteChunk(dev, existingChunk, 1,
2672 /* Backward scanning or we want to use the existing one
2674 * Delete the new one and return early so that the tnode isn't changed
2676 yaffs_DeleteChunk(dev, chunkInNAND, 1,
2684 if (existingChunk == 0) {
2688 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
2693 static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
2696 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
2698 if (chunkInNAND >= 0) {
2699 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
2702 T(YAFFS_TRACE_NANDACCESS,
2703 (TSTR("Chunk %d not found zero instead" TENDSTR),
2705 /* get sane (zero) data if you read a hole */
2706 memset(buffer, 0, in->myDev->nBytesPerChunk);
2712 void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
2716 yaffs_ExtendedTags tags;
2717 yaffs_BlockInfo *bi;
2723 block = chunkId / dev->nChunksPerBlock;
2724 page = chunkId % dev->nChunksPerBlock;
2726 bi = yaffs_GetBlockInfo(dev, block);
2728 T(YAFFS_TRACE_DELETION,
2729 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
2732 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
2734 yaffs_InitialiseTags(&tags);
2736 tags.chunkDeleted = 1;
2738 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
2739 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
2741 dev->nUnmarkedDeletions++;
2744 /* Pull out of the management area.
2745 * If the whole block became dirty, this will kick off an erasure.
2747 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
2748 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
2749 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
2750 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
2753 yaffs_ClearChunkBit(dev, block, page);
2757 if (bi->pagesInUse == 0 &&
2758 !bi->hasShrinkHeader &&
2759 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
2760 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
2761 yaffs_BlockBecameDirty(dev, block);
2765 /* T(("Bad news deleting chunk %d\n",chunkId)); */
2770 static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
2771 const __u8 * buffer, int nBytes,
2774 /* Find old chunk Need to do this to get serial number
2775 * Write new one and patch into tree.
2776 * Invalidate old tags.
2780 yaffs_ExtendedTags prevTags;
2783 yaffs_ExtendedTags newTags;
2785 yaffs_Device *dev = in->myDev;
2787 yaffs_CheckGarbageCollection(dev);
2789 /* Get the previous chunk at this location in the file if it exists */
2790 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
2792 /* Set up new tags */
2793 yaffs_InitialiseTags(&newTags);
2795 newTags.chunkId = chunkInInode;
2796 newTags.objectId = in->objectId;
2797 newTags.serialNumber =
2798 (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
2799 newTags.byteCount = nBytes;
2802 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
2805 if (newChunkId >= 0) {
2806 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
2808 if (prevChunkId >= 0) {
2809 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
2813 yaffs_CheckFileSanity(in);
2819 /* UpdateObjectHeader updates the header on NAND for an object.
2820 * If name is not NULL, then that new name is used.
2822 int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
2823 int isShrink, int shadows)
2826 yaffs_BlockInfo *bi;
2828 yaffs_Device *dev = in->myDev;
2834 yaffs_ExtendedTags newTags;
2836 __u8 *buffer = NULL;
2837 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
2839 yaffs_ObjectHeader *oh = NULL;
2841 if (!in->fake || force) {
2843 yaffs_CheckGarbageCollection(dev);
2845 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
2846 oh = (yaffs_ObjectHeader *) buffer;
2848 prevChunkId = in->chunkId;
2850 if (prevChunkId >= 0) {
2851 yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
2853 memcpy(oldName, oh->name, sizeof(oh->name));
2856 memset(buffer, 0xFF, dev->nBytesPerChunk);
2858 oh->type = in->variantType;
2859 oh->yst_mode = in->yst_mode;
2860 oh->shadowsObject = shadows;
2862 #ifdef CONFIG_YAFFS_WINCE
2863 oh->win_atime[0] = in->win_atime[0];
2864 oh->win_ctime[0] = in->win_ctime[0];
2865 oh->win_mtime[0] = in->win_mtime[0];
2866 oh->win_atime[1] = in->win_atime[1];
2867 oh->win_ctime[1] = in->win_ctime[1];
2868 oh->win_mtime[1] = in->win_mtime[1];
2870 oh->yst_uid = in->yst_uid;
2871 oh->yst_gid = in->yst_gid;
2872 oh->yst_atime = in->yst_atime;
2873 oh->yst_mtime = in->yst_mtime;
2874 oh->yst_ctime = in->yst_ctime;
2875 oh->yst_rdev = in->yst_rdev;
2878 oh->parentObjectId = in->parent->objectId;
2880 oh->parentObjectId = 0;
2883 if (name && *name) {
2884 memset(oh->name, 0, sizeof(oh->name));
2885 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
2886 } else if (prevChunkId) {
2887 memcpy(oh->name, oldName, sizeof(oh->name));
2889 memset(oh->name, 0, sizeof(oh->name));
2892 oh->isShrink = isShrink;
2894 switch (in->variantType) {
2895 case YAFFS_OBJECT_TYPE_UNKNOWN:
2896 /* Should not happen */
2898 case YAFFS_OBJECT_TYPE_FILE:
2900 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
2901 || oh->parentObjectId ==
2902 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
2903 fileVariant.fileSize;
2905 case YAFFS_OBJECT_TYPE_HARDLINK:
2906 oh->equivalentObjectId =
2907 in->variant.hardLinkVariant.equivalentObjectId;
2909 case YAFFS_OBJECT_TYPE_SPECIAL:
2912 case YAFFS_OBJECT_TYPE_DIRECTORY:
2915 case YAFFS_OBJECT_TYPE_SYMLINK:
2916 yaffs_strncpy(oh->alias,
2917 in->variant.symLinkVariant.alias,
2918 YAFFS_MAX_ALIAS_LENGTH);
2919 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
2924 yaffs_InitialiseTags(&newTags);
2926 newTags.chunkId = 0;
2927 newTags.objectId = in->objectId;
2928 newTags.serialNumber = in->serial;
2930 /* Add extra info for file header */
2932 newTags.extraHeaderInfoAvailable = 1;
2933 newTags.extraParentObjectId = oh->parentObjectId;
2934 newTags.extraFileLength = oh->fileSize;
2935 newTags.extraIsShrinkHeader = oh->isShrink;
2936 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
2937 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
2938 newTags.extraObjectType = in->variantType;
2940 /* Create new chunk in NAND */
2942 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
2943 (prevChunkId >= 0) ? 1 : 0);
2945 if (newChunkId >= 0) {
2947 in->chunkId = newChunkId;
2949 if (prevChunkId >= 0) {
2950 yaffs_DeleteChunk(dev, prevChunkId, 1,
2956 /* If this was a shrink, then mark the block that the chunk lives on */
2958 bi = yaffs_GetBlockInfo(in->myDev,
2959 newChunkId /in->myDev-> nChunksPerBlock);
2960 bi->hasShrinkHeader = 1;
2965 retVal = newChunkId;
2970 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
2975 /*------------------------ Short Operations Cache ----------------------------------------
2976 * In many situations where there is no high level buffering (eg WinCE) a lot of
2977 * reads might be short sequential reads, and a lot of writes may be short
2978 * sequential writes. eg. scanning/writing a jpeg file.
2979 * In these cases, a short read/write cache can provide a huge perfomance benefit
2980 * with dumb-as-a-rock code.
2981 * In Linux, the page cache provides read buffering aand the short op cache provides write
2984 * There are a limited number (~10) of cache chunks per device so that we don't
2985 * need a very intelligent search.
2988 static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
2990 yaffs_Device *dev = obj->myDev;
2991 int lowest = -99; /* Stop compiler whining. */
2993 yaffs_ChunkCache *cache;
2994 int chunkWritten = 0;
2995 int nCaches = obj->myDev->nShortOpCaches;
3001 /* Find the dirty cache for this object with the lowest chunk id. */
3002 for (i = 0; i < nCaches; i++) {
3003 if (dev->srCache[i].object == obj &&
3004 dev->srCache[i].dirty) {
3006 || dev->srCache[i].chunkId <
3008 cache = &dev->srCache[i];
3009 lowest = cache->chunkId;
3014 if (cache && !cache->locked) {
3015 /* Write it out and free it up */
3018 yaffs_WriteChunkDataToObject(cache->object,
3024 cache->object = NULL;
3027 } while (cache && chunkWritten > 0);
3030 /* Hoosterman, disk full while writing cache out. */
3031 T(YAFFS_TRACE_ERROR,
3032 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3039 /* Grab us a cache chunk for use.
3040 * First look for an empty one.
3041 * Then look for the least recently used non-dirty one.
3042 * Then look for the least recently used dirty one...., flush and look again.
3044 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
3050 if (dev->nShortOpCaches > 0) {
3051 for (i = 0; i < dev->nShortOpCaches; i++) {
3052 if (!dev->srCache[i].object)
3053 return &dev->srCache[i];
3059 usage = 0; /* just to stop the compiler grizzling */
3061 for (i = 0; i < dev->nShortOpCaches; i++) {
3062 if (!dev->srCache[i].dirty &&
3063 ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
3065 usage = dev->srCache[i].lastUse;
3071 return theOne >= 0 ? &dev->srCache[theOne] : NULL;
3078 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
3080 yaffs_ChunkCache *cache;
3081 yaffs_Object *theObj;
3086 if (dev->nShortOpCaches > 0) {
3087 /* Try find a non-dirty one... */
3089 cache = yaffs_GrabChunkCacheWorker(dev);
3092 /* They were all dirty, find the last recently used object and flush
3093 * its cache, then find again.
3094 * NB what's here is not very accurate, we actually flush the object
3095 * the last recently used page.
3098 /* With locking we can't assume we can use entry zero */
3105 for (i = 0; i < dev->nShortOpCaches; i++) {
3106 if (dev->srCache[i].object &&
3107 !dev->srCache[i].locked &&
3108 (dev->srCache[i].lastUse < usage || !cache))
3110 usage = dev->srCache[i].lastUse;
3111 theObj = dev->srCache[i].object;
3112 cache = &dev->srCache[i];
3117 if (!cache || cache->dirty) {
3118 /* Flush and try again */
3119 yaffs_FlushFilesChunkCache(theObj);
3120 cache = yaffs_GrabChunkCacheWorker(dev);
3130 /* Find a cached chunk */
3131 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
3134 yaffs_Device *dev = obj->myDev;
3136 if (dev->nShortOpCaches > 0) {
3137 for (i = 0; i < dev->nShortOpCaches; i++) {
3138 if (dev->srCache[i].object == obj &&
3139 dev->srCache[i].chunkId == chunkId) {
3142 return &dev->srCache[i];
3149 /* Mark the chunk for the least recently used algorithym */
3150 static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
3154 if (dev->nShortOpCaches > 0) {
3155 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
3156 /* Reset the cache usages */
3158 for (i = 1; i < dev->nShortOpCaches; i++) {
3159 dev->srCache[i].lastUse = 0;
3166 cache->lastUse = dev->srLastUse;
3174 /* Invalidate a single cache page.
3175 * Do this when a whole page gets written,
3176 * ie the short cache for this page is no longer valid.
3178 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
3180 if (object->myDev->nShortOpCaches > 0) {
3181 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
3184 cache->object = NULL;
3189 /* Invalidate all the cache pages associated with this object
3190 * Do this whenever ther file is deleted or resized.
3192 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
3195 yaffs_Device *dev = in->myDev;
3197 if (dev->nShortOpCaches > 0) {
3198 /* Invalidate it. */
3199 for (i = 0; i < dev->nShortOpCaches; i++) {
3200 if (dev->srCache[i].object == in) {
3201 dev->srCache[i].object = NULL;
3207 /*--------------------- File read/write ------------------------
3208 * Read and write have very similar structures.
3209 * In general the read/write has three parts to it
3210 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3211 * Some complete chunks
3212 * An incomplete chunk to end off with
3214 * Curve-balls: the first chunk might also be the last chunk.
3217 int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, __u32 offset,
3226 yaffs_ChunkCache *cache;
3233 chunk = offset / dev->nBytesPerChunk + 1; /* The first chunk is 1 */
3234 start = offset % dev->nBytesPerChunk;
3236 /* OK now check for the curveball where the start and end are in
3239 if ((start + n) < dev->nBytesPerChunk) {
3242 nToCopy = dev->nBytesPerChunk - start;
3245 cache = yaffs_FindChunkCache(in, chunk);
3247 /* If the chunk is already in the cache or it is less than a whole chunk
3248 * then use the cache (if there is caching)
3249 * else bypass the cache.
3251 if (cache || nToCopy != dev->nBytesPerChunk) {
3252 if (dev->nShortOpCaches > 0) {
3254 /* If we can't find the data in the cache, then load it up. */
3257 cache = yaffs_GrabChunkCache(in->myDev);
3259 cache->chunkId = chunk;
3262 yaffs_ReadChunkDataFromObject(in, chunk,
3268 yaffs_UseChunkCache(dev, cache, 0);
3272 #ifdef CONFIG_YAFFS_WINCE
3273 yfsd_UnlockYAFFS(TRUE);
3275 memcpy(buffer, &cache->data[start], nToCopy);
3277 #ifdef CONFIG_YAFFS_WINCE
3278 yfsd_LockYAFFS(TRUE);
3282 /* Read into the local buffer then copy..*/
3285 yaffs_GetTempBuffer(dev, __LINE__);
3286 yaffs_ReadChunkDataFromObject(in, chunk,
3288 #ifdef CONFIG_YAFFS_WINCE
3289 yfsd_UnlockYAFFS(TRUE);
3291 memcpy(buffer, &localBuffer[start], nToCopy);
3293 #ifdef CONFIG_YAFFS_WINCE
3294 yfsd_LockYAFFS(TRUE);
3296 yaffs_ReleaseTempBuffer(dev, localBuffer,
3301 #ifdef CONFIG_YAFFS_WINCE
3302 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
3304 /* Under WinCE can't do direct transfer. Need to use a local buffer.
3305 * This is because we otherwise screw up WinCE's memory mapper
3307 yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
3309 #ifdef CONFIG_YAFFS_WINCE
3310 yfsd_UnlockYAFFS(TRUE);
3312 memcpy(buffer, localBuffer, dev->nBytesPerChunk);
3314 #ifdef CONFIG_YAFFS_WINCE
3315 yfsd_LockYAFFS(TRUE);
3316 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
3320 /* A full chunk. Read directly into the supplied buffer. */
3321 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
3335 int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, __u32 offset,
3336 int nBytes, int writeThrough)
3345 int startOfWrite = offset;
3346 int chunkWritten = 0;
3353 while (n > 0 && chunkWritten >= 0) {
3354 chunk = offset / dev->nBytesPerChunk + 1;
3355 start = offset % dev->nBytesPerChunk;
3357 /* OK now check for the curveball where the start and end are in
3361 if ((start + n) < dev->nBytesPerChunk) {
3364 /* Now folks, to calculate how many bytes to write back....
3365 * If we're overwriting and not writing to then end of file then
3366 * we need to write back as much as was there before.
3370 in->variant.fileVariant.fileSize -
3371 ((chunk - 1) * dev->nBytesPerChunk);
3373 if (nBytesRead > dev->nBytesPerChunk) {
3374 nBytesRead = dev->nBytesPerChunk;
3379 (start + n)) ? nBytesRead : (start + n);
3382 nToCopy = dev->nBytesPerChunk - start;
3383 nToWriteBack = dev->nBytesPerChunk;
3386 if (nToCopy != dev->nBytesPerChunk) {
3387 /* An incomplete start or end chunk (or maybe both start and end chunk) */
3388 if (dev->nShortOpCaches > 0) {
3389 yaffs_ChunkCache *cache;
3390 /* If we can't find the data in the cache, then load the cache */
3391 cache = yaffs_FindChunkCache(in, chunk);
3393 && yaffs_CheckSpaceForAllocation(in->
3395 cache = yaffs_GrabChunkCache(in->myDev);
3397 cache->chunkId = chunk;
3400 yaffs_ReadChunkDataFromObject(in, chunk,
3406 yaffs_UseChunkCache(dev, cache, 1);
3408 #ifdef CONFIG_YAFFS_WINCE
3409 yfsd_UnlockYAFFS(TRUE);
3412 memcpy(&cache->data[start], buffer,
3415 #ifdef CONFIG_YAFFS_WINCE
3416 yfsd_LockYAFFS(TRUE);
3419 cache->nBytes = nToWriteBack;
3423 yaffs_WriteChunkDataToObject
3426 cache->data, cache->nBytes,
3432 chunkWritten = -1; /* fail the write */
3435 /* An incomplete start or end chunk (or maybe both start and end chunk)
3436 * Read into the local buffer then copy, then copy over and write back.
3440 yaffs_GetTempBuffer(dev, __LINE__);
3442 yaffs_ReadChunkDataFromObject(in, chunk,
3445 #ifdef CONFIG_YAFFS_WINCE
3446 yfsd_UnlockYAFFS(TRUE);
3449 memcpy(&localBuffer[start], buffer, nToCopy);
3451 #ifdef CONFIG_YAFFS_WINCE
3452 yfsd_LockYAFFS(TRUE);
3455 yaffs_WriteChunkDataToObject(in, chunk,
3460 yaffs_ReleaseTempBuffer(dev, localBuffer,
3467 #ifdef CONFIG_YAFFS_WINCE
3468 /* Under WinCE can't do direct transfer. Need to use a local buffer.
3469 * This is because we otherwise screw up WinCE's memory mapper
3471 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
3472 #ifdef CONFIG_YAFFS_WINCE
3473 yfsd_UnlockYAFFS(TRUE);
3475 memcpy(localBuffer, buffer, dev->nBytesPerChunk);
3476 #ifdef CONFIG_YAFFS_WINCE
3477 yfsd_LockYAFFS(TRUE);
3480 yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
3481 dev->nBytesPerChunk,
3483 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
3485 /* A full chunk. Write directly from the supplied buffer. */
3487 yaffs_WriteChunkDataToObject(in, chunk, buffer,
3488 dev->nBytesPerChunk,
3491 /* Since we've overwritten the cached data, we better invalidate it. */
3492 yaffs_InvalidateChunkCache(in, chunk);
3495 if (chunkWritten >= 0) {
3504 /* Update file object */
3506 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
3507 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
3516 /* ---------------------- File resizing stuff ------------------ */
3518 static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
3521 yaffs_Device *dev = in->myDev;
3522 int oldFileSize = in->variant.fileVariant.fileSize;
3524 int lastDel = 1 + (oldFileSize - 1) / dev->nBytesPerChunk;
3526 int startDel = 1 + (newSize + dev->nBytesPerChunk - 1) /
3527 dev->nBytesPerChunk;
3531 /* Delete backwards so that we don't end up with holes if
3532 * power is lost part-way through the operation.
3534 for (i = lastDel; i >= startDel; i--) {
3535 /* NB this could be optimised somewhat,
3536 * eg. could retrieve the tags and write them without
3537 * using yaffs_DeleteChunk
3540 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
3543 (dev->internalStartBlock * dev->nChunksPerBlock)
3545 ((dev->internalEndBlock +
3546 1) * dev->nChunksPerBlock)) {
3547 T(YAFFS_TRACE_ALWAYS,
3548 (TSTR("Found daft chunkId %d for %d" TENDSTR),
3552 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
3559 int yaffs_ResizeFile(yaffs_Object * in, int newSize)
3562 int oldFileSize = in->variant.fileVariant.fileSize;
3563 int sizeOfPartialChunk;
3564 yaffs_Device *dev = in->myDev;
3566 sizeOfPartialChunk = newSize % dev->nBytesPerChunk;
3568 yaffs_FlushFilesChunkCache(in);
3569 yaffs_InvalidateWholeChunkCache(in);
3571 yaffs_CheckGarbageCollection(dev);
3573 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3574 return yaffs_GetFileSize(in);
3577 if (newSize == oldFileSize) {
3581 if (newSize < oldFileSize) {
3583 yaffs_PruneResizedChunks(in, newSize);
3585 if (sizeOfPartialChunk != 0) {
3586 int lastChunk = 1 + newSize / dev->nBytesPerChunk;
3587 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
3589 /* Got to read and rewrite the last chunk with its new size and zero pad */
3590 yaffs_ReadChunkDataFromObject(in, lastChunk,
3593 memset(localBuffer + sizeOfPartialChunk, 0,
3594 dev->nBytesPerChunk - sizeOfPartialChunk);
3596 yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
3597 sizeOfPartialChunk, 1);
3599 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
3602 in->variant.fileVariant.fileSize = newSize;
3604 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
3606 /* Write a new object header.
3607 * show we've shrunk the file, if need be
3608 * Do this only if the file is not in the deleted directories.
3610 if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
3611 in->parent->objectId != YAFFS_OBJECTID_DELETED) {
3612 yaffs_UpdateObjectHeader(in, NULL, 0,
3613 (newSize < oldFileSize) ? 1 : 0, 0);
3619 loff_t yaffs_GetFileSize(yaffs_Object * obj)
3621 obj = yaffs_GetEquivalentObject(obj);
3623 switch (obj->variantType) {
3624 case YAFFS_OBJECT_TYPE_FILE:
3625 return obj->variant.fileVariant.fileSize;
3626 case YAFFS_OBJECT_TYPE_SYMLINK:
3627 return yaffs_strlen(obj->variant.symLinkVariant.alias);
3635 int yaffs_FlushFile(yaffs_Object * in, int updateTime)
3639 yaffs_FlushFilesChunkCache(in);
3641 #ifdef CONFIG_YAFFS_WINCE
3642 yfsd_WinFileTimeNow(in->win_mtime);
3645 in->yst_mtime = Y_CURRENT_TIME;
3651 (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
3652 0) ? YAFFS_OK : YAFFS_FAIL;
3661 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
3664 /* First off, invalidate the file's data in the cache, without flushing. */
3665 yaffs_InvalidateWholeChunkCache(in);
3667 if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
3668 /* Move to the unlinked directory so we have a record that it was deleted. */
3669 yaffs_ChangeObjectName(in, in->myDev->deletedDir, NULL, 0, 0);
3673 yaffs_RemoveObjectFromDirectory(in);
3674 yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
3677 yaffs_FreeObject(in);
3682 /* yaffs_DeleteFile deletes the whole file data
3683 * and the inode associated with the file.
3684 * It does not delete the links associated with the file.
3686 static int yaffs_UnlinkFile(yaffs_Object * in)
3690 int immediateDeletion = 0;
3695 immediateDeletion = 1;
3699 if (in->inUse <= 0) {
3700 immediateDeletion = 1;
3704 if (immediateDeletion) {
3706 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
3708 T(YAFFS_TRACE_TRACING,
3709 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
3712 in->myDev->nDeletedFiles++;
3713 if (0 && in->myDev->isYaffs2) {
3714 yaffs_ResizeFile(in, 0);
3716 yaffs_SoftDeleteFile(in);
3719 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
3727 int yaffs_DeleteFile(yaffs_Object * in)
3729 int retVal = YAFFS_OK;
3731 if (in->nDataChunks > 0) {
3732 /* Use soft deletion if there is data in the file */
3733 if (!in->unlinked) {
3734 retVal = yaffs_UnlinkFile(in);
3736 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
3738 in->myDev->nDeletedFiles++;
3739 yaffs_SoftDeleteFile(in);
3741 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
3743 /* The file has no data chunks so we toss it immediately */
3744 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
3745 in->variant.fileVariant.top = NULL;
3746 yaffs_DoGenericObjectDeletion(in);
3752 static int yaffs_DeleteDirectory(yaffs_Object * in)
3754 /* First check that the directory is empty. */
3755 if (list_empty(&in->variant.directoryVariant.children)) {
3756 return yaffs_DoGenericObjectDeletion(in);
3763 static int yaffs_DeleteSymLink(yaffs_Object * in)
3765 YFREE(in->variant.symLinkVariant.alias);
3767 return yaffs_DoGenericObjectDeletion(in);
3770 static int yaffs_DeleteHardLink(yaffs_Object * in)
3772 /* remove this hardlink from the list assocaited with the equivalent
3775 list_del(&in->hardLinks);
3776 return yaffs_DoGenericObjectDeletion(in);
3779 static void yaffs_DestroyObject(yaffs_Object * obj)
3781 switch (obj->variantType) {
3782 case YAFFS_OBJECT_TYPE_FILE:
3783 yaffs_DeleteFile(obj);
3785 case YAFFS_OBJECT_TYPE_DIRECTORY:
3786 yaffs_DeleteDirectory(obj);
3788 case YAFFS_OBJECT_TYPE_SYMLINK:
3789 yaffs_DeleteSymLink(obj);
3791 case YAFFS_OBJECT_TYPE_HARDLINK:
3792 yaffs_DeleteHardLink(obj);
3794 case YAFFS_OBJECT_TYPE_SPECIAL:
3795 yaffs_DoGenericObjectDeletion(obj);
3797 case YAFFS_OBJECT_TYPE_UNKNOWN:
3798 break; /* should not happen. */
3802 static int yaffs_UnlinkWorker(yaffs_Object * obj)
3805 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
3806 return yaffs_DeleteHardLink(obj);
3807 } else if (!list_empty(&obj->hardLinks)) {
3808 /* Curve ball: We're unlinking an object that has a hardlink.
3810 * This problem arises because we are not strictly following
3811 * The Linux link/inode model.
3813 * We can't really delete the object.
3814 * Instead, we do the following:
3815 * - Select a hardlink.
3816 * - Unhook it from the hard links
3817 * - Unhook it from its parent directory (so that the rename can work)
3818 * - Rename the object to the hardlink's name.
3819 * - Delete the hardlink
3824 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
3826 hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
3828 list_del_init(&hl->hardLinks);
3829 list_del_init(&hl->siblings);
3831 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
3833 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
3835 if (retVal == YAFFS_OK) {
3836 retVal = yaffs_DoGenericObjectDeletion(hl);
3841 switch (obj->variantType) {
3842 case YAFFS_OBJECT_TYPE_FILE:
3843 return yaffs_UnlinkFile(obj);
3845 case YAFFS_OBJECT_TYPE_DIRECTORY:
3846 return yaffs_DeleteDirectory(obj);
3848 case YAFFS_OBJECT_TYPE_SYMLINK:
3849 return yaffs_DeleteSymLink(obj);
3851 case YAFFS_OBJECT_TYPE_SPECIAL:
3852 return yaffs_DoGenericObjectDeletion(obj);
3854 case YAFFS_OBJECT_TYPE_HARDLINK:
3855 case YAFFS_OBJECT_TYPE_UNKNOWN:
3863 static int yaffs_UnlinkObject( yaffs_Object *obj)
3866 if (obj && obj->unlinkAllowed) {
3867 return yaffs_UnlinkWorker(obj);
3873 int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
3877 obj = yaffs_FindObjectByName(dir, name);
3878 return yaffs_UnlinkObject(obj);
3881 /*----------------------- Initialisation Scanning ---------------------- */
3883 static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
3884 int backwardScanning)
3888 if (!backwardScanning) {
3889 /* Handle YAFFS1 forward scanning case
3890 * For YAFFS1 we always do the deletion
3894 /* Handle YAFFS2 case (backward scanning)
3895 * If the shadowed object exists then ignore.
3897 if (yaffs_FindObjectByNumber(dev, objId)) {
3902 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
3903 * We put it in unlinked dir to be cleaned up after the scanning
3906 yaffs_FindOrCreateObjectByNumber(dev, objId,
3907 YAFFS_OBJECT_TYPE_FILE);
3908 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
3909 obj->variant.fileVariant.shrinkSize = 0;
3910 obj->valid = 1; /* So that we don't read any other info for this file */
3919 static int yaffs_Scan(yaffs_Device * dev)
3921 yaffs_ExtendedTags tags;
3926 int nBlocksToScan = 0;
3931 yaffs_BlockState state;
3932 yaffs_Object *hardList = NULL;
3934 yaffs_BlockInfo *bi;
3936 yaffs_ObjectHeader *oh;
3938 yaffs_Object *parent;
3939 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
3943 yaffs_BlockIndex *blockIndex = NULL;
3946 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
3947 dev->internalStartBlock, dev->internalEndBlock));
3949 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
3951 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
3953 if (dev->isYaffs2) {
3954 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
3957 /* Scan all the blocks to determine their state */
3958 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
3959 bi = yaffs_GetBlockInfo(dev, blk);
3960 yaffs_ClearChunkBits(dev, blk);
3962 bi->softDeletions = 0;
3964 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
3966 bi->blockState = state;
3967 bi->sequenceNumber = sequenceNumber;
3969 T(YAFFS_TRACE_SCAN_DEBUG,
3970 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
3971 state, sequenceNumber));
3973 if (state == YAFFS_BLOCK_STATE_DEAD) {
3974 T(YAFFS_TRACE_BAD_BLOCKS,
3975 (TSTR("block %d is bad" TENDSTR), blk));
3976 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
3977 T(YAFFS_TRACE_SCAN_DEBUG,
3978 (TSTR("Block empty " TENDSTR)));
3979 dev->nErasedBlocks++;
3980 dev->nFreeChunks += dev->nChunksPerBlock;
3981 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3983 /* Determine the highest sequence number */
3984 if (dev->isYaffs2 &&
3985 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
3986 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
3988 blockIndex[nBlocksToScan].seq = sequenceNumber;
3989 blockIndex[nBlocksToScan].block = blk;
3993 if (sequenceNumber >= dev->sequenceNumber) {
3994 dev->sequenceNumber = sequenceNumber;
3996 } else if (dev->isYaffs2) {
3997 /* TODO: Nasty sequence number! */
4000 ("Block scanning block %d has bad sequence number %d"
4001 TENDSTR), blk, sequenceNumber));
4008 * Dungy old bubble sort for now...
4010 if (dev->isYaffs2) {
4011 yaffs_BlockIndex temp;
4015 for (i = 0; i < nBlocksToScan; i++)
4016 for (j = i + 1; j < nBlocksToScan; j++)
4017 if (blockIndex[i].seq > blockIndex[j].seq) {
4018 temp = blockIndex[j];
4019 blockIndex[j] = blockIndex[i];
4020 blockIndex[i] = temp;
4024 /* Now scan the blocks looking at the data. */
4025 if (dev->isYaffs2) {
4027 endIterator = nBlocksToScan - 1;
4028 T(YAFFS_TRACE_SCAN_DEBUG,
4029 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
4031 startIterator = dev->internalStartBlock;
4032 endIterator = dev->internalEndBlock;
4035 /* For each block.... */
4036 for (blockIterator = startIterator; blockIterator <= endIterator;
4039 if (dev->isYaffs2) {
4040 /* get the block to scan in the correct order */
4041 blk = blockIndex[blockIterator].block;
4043 blk = blockIterator;
4046 bi = yaffs_GetBlockInfo(dev, blk);
4047 state = bi->blockState;
4051 /* For each chunk in each block that needs scanning....*/
4052 for (c = 0; c < dev->nChunksPerBlock &&
4053 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
4054 /* Read the tags and decide what to do */
4055 chunk = blk * dev->nChunksPerBlock + c;
4057 yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
4060 /* Let's have a good look at this chunk... */
4062 if (!dev->isYaffs2 && tags.chunkDeleted) {
4068 /*T((" %d %d deleted\n",blk,c)); */
4069 } else if (!tags.chunkUsed) {
4070 /* An unassigned chunk in the block
4071 * This means that either the block is empty or
4072 * this is the one being allocated from
4076 /* We're looking at the first chunk in the block so the block is unused */
4077 state = YAFFS_BLOCK_STATE_EMPTY;
4078 dev->nErasedBlocks++;
4080 /* this is the block being allocated from */
4083 (" Allocating from %d %d" TENDSTR),
4085 state = YAFFS_BLOCK_STATE_ALLOCATING;
4086 dev->allocationBlock = blk;
4087 dev->allocationPage = c;
4088 dev->allocationBlockFinder = blk;
4089 /* Set it to here to encourage the allocator to go forth from here. */
4091 /* Yaffs2 sanity check:
4092 * This should be the one with the highest sequence number
4095 && (dev->sequenceNumber !=
4096 bi->sequenceNumber)) {
4097 T(YAFFS_TRACE_ALWAYS,
4099 ("yaffs: Allocation block %d was not highest sequence id:"
4100 " block seq = %d, dev seq = %d"
4101 TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
4105 dev->nFreeChunks += (dev->nChunksPerBlock - c);
4106 } else if (tags.chunkId > 0) {
4107 /* chunkId > 0 so it is a data chunk... */
4108 unsigned int endpos;
4110 yaffs_SetChunkBit(dev, blk, c);
4113 in = yaffs_FindOrCreateObjectByNumber(dev,
4116 YAFFS_OBJECT_TYPE_FILE);
4117 /* PutChunkIntoFile checks for a clash (two data chunks with
4118 * the same chunkId).
4120 yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,
4123 (tags.chunkId - 1) * dev->nBytesPerChunk +
4125 if (in->variantType == YAFFS_OBJECT_TYPE_FILE
4126 && in->variant.fileVariant.scannedFileSize <
4128 in->variant.fileVariant.
4129 scannedFileSize = endpos;
4130 if (!dev->useHeaderFileSize) {
4131 in->variant.fileVariant.
4133 in->variant.fileVariant.
4138 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
4140 /* chunkId == 0, so it is an ObjectHeader.
4141 * Thus, we read in the object header and make the object
4143 yaffs_SetChunkBit(dev, blk, c);
4146 yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
4150 oh = (yaffs_ObjectHeader *) chunkData;
4152 in = yaffs_FindObjectByNumber(dev,
4154 if (in && in->variantType != oh->type) {
4155 /* This should not happen, but somehow
4156 * Wev'e ended up with an objectId that has been reused but not yet
4157 * deleted, and worse still it has changed type. Delete the old object.
4160 yaffs_DestroyObject(in);
4165 in = yaffs_FindOrCreateObjectByNumber(dev,
4170 if (oh->shadowsObject > 0) {
4171 yaffs_HandleShadowedObject(dev,
4178 /* We have already filled this one. We have a duplicate and need to resolve it. */
4180 unsigned existingSerial = in->serial;
4181 unsigned newSerial = tags.serialNumber;
4183 if (dev->isYaffs2 ||
4184 ((existingSerial + 1) & 3) ==
4186 /* Use new one - destroy the exisiting one */
4187 yaffs_DeleteChunk(dev,
4192 /* Use existing - destroy this one. */
4193 yaffs_DeleteChunk(dev, chunk, 1,
4199 (tags.objectId == YAFFS_OBJECTID_ROOT ||
4200 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
4201 /* We only load some info, don't fiddle with directory structure */
4203 in->variantType = oh->type;
4205 in->yst_mode = oh->yst_mode;
4206 #ifdef CONFIG_YAFFS_WINCE
4207 in->win_atime[0] = oh->win_atime[0];
4208 in->win_ctime[0] = oh->win_ctime[0];
4209 in->win_mtime[0] = oh->win_mtime[0];
4210 in->win_atime[1] = oh->win_atime[1];
4211 in->win_ctime[1] = oh->win_ctime[1];
4212 in->win_mtime[1] = oh->win_mtime[1];
4214 in->yst_uid = oh->yst_uid;
4215 in->yst_gid = oh->yst_gid;
4216 in->yst_atime = oh->yst_atime;
4217 in->yst_mtime = oh->yst_mtime;
4218 in->yst_ctime = oh->yst_ctime;
4219 in->yst_rdev = oh->yst_rdev;
4221 in->chunkId = chunk;
4223 } else if (!in->valid) {
4224 /* we need to load this info */
4227 in->variantType = oh->type;
4229 in->yst_mode = oh->yst_mode;
4230 #ifdef CONFIG_YAFFS_WINCE
4231 in->win_atime[0] = oh->win_atime[0];
4232 in->win_ctime[0] = oh->win_ctime[0];
4233 in->win_mtime[0] = oh->win_mtime[0];
4234 in->win_atime[1] = oh->win_atime[1];
4235 in->win_ctime[1] = oh->win_ctime[1];
4236 in->win_mtime[1] = oh->win_mtime[1];
4238 in->yst_uid = oh->yst_uid;
4239 in->yst_gid = oh->yst_gid;
4240 in->yst_atime = oh->yst_atime;
4241 in->yst_mtime = oh->yst_mtime;
4242 in->yst_ctime = oh->yst_ctime;
4243 in->yst_rdev = oh->yst_rdev;
4245 in->chunkId = chunk;
4247 yaffs_SetObjectName(in, oh->name);
4250 /* directory stuff...
4255 yaffs_FindOrCreateObjectByNumber
4256 (dev, oh->parentObjectId,
4257 YAFFS_OBJECT_TYPE_DIRECTORY);
4258 if (parent->variantType ==
4259 YAFFS_OBJECT_TYPE_UNKNOWN) {
4260 /* Set up as a directory */
4261 parent->variantType =
4262 YAFFS_OBJECT_TYPE_DIRECTORY;
4263 INIT_LIST_HEAD(&parent->variant.
4266 } else if (parent->variantType !=
4267 YAFFS_OBJECT_TYPE_DIRECTORY)
4269 /* Hoosterman, another problem....
4270 * We're trying to use a non-directory as a directory
4273 T(YAFFS_TRACE_ERROR,
4275 ("yaffs tragedy: attempting to use non-directory as"
4276 " a directory in scan. Put in lost+found."
4278 parent = dev->lostNFoundDir;
4281 yaffs_AddObjectToDirectory(parent, in);
4283 if (0 && (parent == dev->deletedDir ||
4284 parent == dev->unlinkedDir)) {
4285 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
4286 dev->nDeletedFiles++;
4288 /* Note re hardlinks.
4289 * Since we might scan a hardlink before its equivalent object is scanned
4290 * we put them all in a list.
4291 * After scanning is complete, we should have all the objects, so we run through this
4292 * list and fix up all the chains.
4295 switch (in->variantType) {
4296 case YAFFS_OBJECT_TYPE_UNKNOWN:
4297 /* Todo got a problem */
4299 case YAFFS_OBJECT_TYPE_FILE:
4302 /* Prune back the shrunken chunks */
4303 yaffs_PruneResizedChunks
4305 /* Mark the block as having a shrinkHeader */
4306 bi->hasShrinkHeader = 1;
4309 if (dev->useHeaderFileSize)
4311 in->variant.fileVariant.
4316 case YAFFS_OBJECT_TYPE_HARDLINK:
4317 in->variant.hardLinkVariant.
4318 equivalentObjectId =
4319 oh->equivalentObjectId;
4320 in->hardLinks.next =
4321 (struct list_head *)
4325 case YAFFS_OBJECT_TYPE_DIRECTORY:
4328 case YAFFS_OBJECT_TYPE_SPECIAL:
4331 case YAFFS_OBJECT_TYPE_SYMLINK:
4332 in->variant.symLinkVariant.
4334 yaffs_CloneString(oh->alias);
4338 if (parent == dev->deletedDir) {
4339 yaffs_DestroyObject(in);
4340 bi->hasShrinkHeader = 1;
4346 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4347 /* If we got this far while scanning, then the block is fully allocated.*/
4348 state = YAFFS_BLOCK_STATE_FULL;
4351 bi->blockState = state;
4353 /* Now let's see if it was dirty */
4354 if (bi->pagesInUse == 0 &&
4355 !bi->hasShrinkHeader &&
4356 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
4357 yaffs_BlockBecameDirty(dev, blk);
4366 /* Ok, we've done all the scanning.
4367 * Fix up the hard link chains.
4368 * We should now have scanned all the objects, now it's time to add these
4373 hardList = (yaffs_Object *) (hardList->hardLinks.next);
4375 in = yaffs_FindObjectByNumber(dev,
4376 hl->variant.hardLinkVariant.
4377 equivalentObjectId);
4380 /* Add the hardlink pointers */
4381 hl->variant.hardLinkVariant.equivalentObject = in;
4382 list_add(&hl->hardLinks, &in->hardLinks);
4384 /* Todo Need to report/handle this better.
4385 * Got a problem... hardlink to a non-existant object
4387 hl->variant.hardLinkVariant.equivalentObject = NULL;
4388 INIT_LIST_HEAD(&hl->hardLinks);
4394 /* Handle the unlinked files. Since they were left in an unlinked state we should
4398 struct list_head *i;
4399 struct list_head *n;
4402 /* Soft delete all the unlinked files */
4403 list_for_each_safe(i, n,
4404 &dev->unlinkedDir->variant.directoryVariant.
4407 l = list_entry(i, yaffs_Object, siblings);
4408 yaffs_DestroyObject(l);
4413 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
4415 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
4420 static int yaffs_ScanBackwards(yaffs_Device * dev)
4422 yaffs_ExtendedTags tags;
4427 int nBlocksToScan = 0;
4432 yaffs_BlockState state;
4433 yaffs_Object *hardList = NULL;
4435 yaffs_BlockInfo *bi;
4437 yaffs_ObjectHeader *oh;
4439 yaffs_Object *parent;
4440 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
4444 yaffs_BlockIndex *blockIndex = NULL;
4446 if (!dev->isYaffs2) {
4448 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
4454 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
4455 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
4457 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
4459 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
4461 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
4463 /* Scan all the blocks to determine their state */
4464 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
4465 bi = yaffs_GetBlockInfo(dev, blk);
4466 yaffs_ClearChunkBits(dev, blk);
4468 bi->softDeletions = 0;
4470 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
4472 bi->blockState = state;
4473 bi->sequenceNumber = sequenceNumber;
4475 T(YAFFS_TRACE_SCAN_DEBUG,
4476 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
4477 state, sequenceNumber));
4479 if (state == YAFFS_BLOCK_STATE_DEAD) {
4480 T(YAFFS_TRACE_BAD_BLOCKS,
4481 (TSTR("block %d is bad" TENDSTR), blk));
4482 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
4483 T(YAFFS_TRACE_SCAN_DEBUG,
4484 (TSTR("Block empty " TENDSTR)));
4485 dev->nErasedBlocks++;
4486 dev->nFreeChunks += dev->nChunksPerBlock;
4487 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4489 /* Determine the highest sequence number */
4490 if (dev->isYaffs2 &&
4491 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
4492 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
4494 blockIndex[nBlocksToScan].seq = sequenceNumber;
4495 blockIndex[nBlocksToScan].block = blk;
4499 if (sequenceNumber >= dev->sequenceNumber) {
4500 dev->sequenceNumber = sequenceNumber;
4502 } else if (dev->isYaffs2) {
4503 /* TODO: Nasty sequence number! */
4506 ("Block scanning block %d has bad sequence number %d"
4507 TENDSTR), blk, sequenceNumber));
4515 * Dungy old bubble sort for now...
4518 yaffs_BlockIndex temp;
4522 for (i = 0; i < nBlocksToScan; i++)
4523 for (j = i + 1; j < nBlocksToScan; j++)
4524 if (blockIndex[i].seq > blockIndex[j].seq) {
4525 temp = blockIndex[j];
4526 blockIndex[j] = blockIndex[i];
4527 blockIndex[i] = temp;
4531 /* Now scan the blocks looking at the data. */
4533 endIterator = nBlocksToScan - 1;
4534 T(YAFFS_TRACE_SCAN_DEBUG,
4535 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
4537 /* For each block.... backwards */
4538 for (blockIterator = endIterator; blockIterator >= startIterator;
4541 /* get the block to scan in the correct order */
4542 blk = blockIndex[blockIterator].block;
4544 bi = yaffs_GetBlockInfo(dev, blk);
4545 state = bi->blockState;
4549 /* For each chunk in each block that needs scanning.... */
4550 for (c = dev->nChunksPerBlock - 1; c >= 0 &&
4551 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
4552 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
4553 /* Scan backwards...
4554 * Read the tags and decide what to do
4556 chunk = blk * dev->nChunksPerBlock + c;
4558 yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
4561 /* Let's have a good look at this chunk... */
4563 if (!tags.chunkUsed) {
4564 // An unassigned chunk in the block
4565 // This means that either the block is empty or
4566 // this is the one being allocated from
4569 /* We're looking at the first chunk in the block so the block is unused */
4570 state = YAFFS_BLOCK_STATE_EMPTY;
4571 dev->nErasedBlocks++;
4573 /* this is the block being allocated from */
4575 YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4578 (" Allocating from %d %d"
4581 state = YAFFS_BLOCK_STATE_ALLOCATING;
4582 dev->allocationBlock = blk;
4583 dev->allocationPage = c;
4584 dev->allocationBlockFinder = blk;
4585 /* Set it to here to encourage the allocator to
4586 * go forth from here.
4589 /* Yaffs2 sanity check:
4590 * This should be the one with the highest sequence number
4593 && (dev->sequenceNumber !=
4594 bi->sequenceNumber)) {
4595 T(YAFFS_TRACE_ALWAYS,
4597 ("yaffs: Allocation block %d was not highest sequence "
4598 "id: block seq = %d, dev seq = %d"
4601 dev->sequenceNumber));
4606 } else if (tags.chunkId > 0) {
4607 /* chunkId > 0 so it is a data chunk... */
4608 unsigned int endpos;
4611 (tags.chunkId - 1) * dev->nBytesPerChunk;
4613 yaffs_SetChunkBit(dev, blk, c);
4616 in = yaffs_FindOrCreateObjectByNumber(dev,
4619 YAFFS_OBJECT_TYPE_FILE);
4620 if (in->variantType == YAFFS_OBJECT_TYPE_FILE
4622 in->variant.fileVariant.shrinkSize) {
4623 /* This has not been invalidated by a resize */
4624 yaffs_PutChunkIntoFile(in, tags.chunkId,
4627 /* File size is calculated by looking at the data chunks if we have not
4628 * seen an object header yet. Stop this practice once we find an object header.
4632 1) * dev->nBytesPerChunk +
4635 if (!in->valid && /* have not got an object header yet */
4636 in->variant.fileVariant.
4637 scannedFileSize < endpos) {
4638 in->variant.fileVariant.
4639 scannedFileSize = endpos;
4640 in->variant.fileVariant.
4642 in->variant.fileVariant.
4647 /* This chunk has been invalidated by a resize, so delete */
4648 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
4652 /* chunkId == 0, so it is an ObjectHeader.
4653 * Thus, we read in the object header and make the object
4655 yaffs_SetChunkBit(dev, blk, c);
4661 if (tags.extraHeaderInfoAvailable) {
4662 in = yaffs_FindOrCreateObjectByNumber
4663 (dev, tags.objectId,
4664 tags.extraObjectType);
4667 if (!in || !in->valid) {
4669 /* If we don't have valid info then we need to read the chunk
4670 * TODO In future we can probably defer reading the chunk and
4671 * living with invalid data until needed.
4674 yaffs_ReadChunkWithTagsFromNAND(dev,
4679 oh = (yaffs_ObjectHeader *) chunkData;
4682 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
4687 /* TODO Hoosterman we have a problem! */
4688 T(YAFFS_TRACE_ERROR,
4690 ("yaffs tragedy: Could not make object for object %d "
4691 "at chunk %d during scan"
4692 TENDSTR), tags.objectId, chunk));
4697 /* We have already filled this one.
4698 * We have a duplicate that will be discarded, but
4699 * we first have to suck out resize info if it is a file.
4702 if ((in->variantType ==
4703 YAFFS_OBJECT_TYPE_FILE) && ((oh
4708 YAFFS_OBJECT_TYPE_FILE)
4711 extraHeaderInfoAvailable
4716 YAFFS_OBJECT_TYPE_FILE))
4719 (oh) ? oh->fileSize : tags.
4721 __u32 parentObjectId =
4723 parentObjectId : tags.
4724 extraParentObjectId;
4726 (oh) ? oh->isShrink : tags.
4727 extraIsShrinkHeader;
4729 /* If it is deleted (unlinked at start also means deleted)
4730 * we treat the file size as being zeroed at this point.
4732 if (parentObjectId ==
4733 YAFFS_OBJECTID_DELETED
4734 || parentObjectId ==
4735 YAFFS_OBJECTID_UNLINKED) {
4741 in->variant.fileVariant.
4742 shrinkSize > thisSize) {
4743 in->variant.fileVariant.
4749 bi->hasShrinkHeader = 1;
4753 /* Use existing - destroy this one. */
4754 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
4759 (tags.objectId == YAFFS_OBJECTID_ROOT ||
4761 YAFFS_OBJECTID_LOSTNFOUND)) {
4762 /* We only load some info, don't fiddle with directory structure */
4764 in->variantType = oh->type;
4766 in->yst_mode = oh->yst_mode;
4767 #ifdef CONFIG_YAFFS_WINCE
4768 in->win_atime[0] = oh->win_atime[0];
4769 in->win_ctime[0] = oh->win_ctime[0];
4770 in->win_mtime[0] = oh->win_mtime[0];
4771 in->win_atime[1] = oh->win_atime[1];
4772 in->win_ctime[1] = oh->win_ctime[1];
4773 in->win_mtime[1] = oh->win_mtime[1];
4775 in->yst_uid = oh->yst_uid;
4776 in->yst_gid = oh->yst_gid;
4777 in->yst_atime = oh->yst_atime;
4778 in->yst_mtime = oh->yst_mtime;
4779 in->yst_ctime = oh->yst_ctime;
4780 in->yst_rdev = oh->yst_rdev;
4782 in->chunkId = chunk;
4784 } else if (!in->valid) {
4785 /* we need to load this info */
4788 in->variantType = oh->type;
4790 in->yst_mode = oh->yst_mode;
4791 #ifdef CONFIG_YAFFS_WINCE
4792 in->win_atime[0] = oh->win_atime[0];
4793 in->win_ctime[0] = oh->win_ctime[0];
4794 in->win_mtime[0] = oh->win_mtime[0];
4795 in->win_atime[1] = oh->win_atime[1];
4796 in->win_ctime[1] = oh->win_ctime[1];
4797 in->win_mtime[1] = oh->win_mtime[1];
4799 in->yst_uid = oh->yst_uid;
4800 in->yst_gid = oh->yst_gid;
4801 in->yst_atime = oh->yst_atime;
4802 in->yst_mtime = oh->yst_mtime;
4803 in->yst_ctime = oh->yst_ctime;
4804 in->yst_rdev = oh->yst_rdev;
4806 in->chunkId = chunk;
4808 if (oh->shadowsObject > 0) {
4809 yaffs_HandleShadowedObject(dev,
4815 yaffs_SetObjectName(in, oh->name);
4818 /* directory stuff...
4823 yaffs_FindOrCreateObjectByNumber
4824 (dev, oh->parentObjectId,
4825 YAFFS_OBJECT_TYPE_DIRECTORY);
4826 if (parent->variantType ==
4827 YAFFS_OBJECT_TYPE_UNKNOWN) {
4828 /* Set up as a directory */
4829 parent->variantType =
4830 YAFFS_OBJECT_TYPE_DIRECTORY;
4831 INIT_LIST_HEAD(&parent->variant.
4834 } else if (parent->variantType !=
4835 YAFFS_OBJECT_TYPE_DIRECTORY)
4837 /* Hoosterman, another problem....
4838 * We're trying to use a non-directory as a directory
4841 T(YAFFS_TRACE_ERROR,
4843 ("yaffs tragedy: attempting to use non-directory as"
4844 " a directory in scan. Put in lost+found."
4846 parent = dev->lostNFoundDir;
4849 yaffs_AddObjectToDirectory(parent, in);
4851 itsUnlinked = (parent == dev->deletedDir) ||
4852 (parent == dev->unlinkedDir);
4855 /* Mark the block as having a shrinkHeader */
4856 bi->hasShrinkHeader = 1;
4859 /* Note re hardlinks.
4860 * Since we might scan a hardlink before its equivalent object is scanned
4861 * we put them all in a list.
4862 * After scanning is complete, we should have all the objects, so we run
4863 * through this list and fix up all the chains.
4866 switch (in->variantType) {
4867 case YAFFS_OBJECT_TYPE_UNKNOWN:
4868 /* Todo got a problem */
4870 case YAFFS_OBJECT_TYPE_FILE:
4872 if (in->variant.fileVariant.
4875 /* This covers the case where the file size is greater
4876 * than where the data is
4877 * This will happen if the file is resized to be larger
4878 * than its current data extents.
4880 in->variant.fileVariant.fileSize =
4882 in->variant.fileVariant.scannedFileSize =
4883 in->variant.fileVariant.fileSize;
4887 in->variant.fileVariant.shrinkSize >
4889 in->variant.fileVariant.shrinkSize =
4894 case YAFFS_OBJECT_TYPE_HARDLINK:
4896 in->variant.hardLinkVariant.equivalentObjectId =
4897 oh->equivalentObjectId;
4898 in->hardLinks.next =
4899 (struct list_head *) hardList;
4903 case YAFFS_OBJECT_TYPE_DIRECTORY:
4906 case YAFFS_OBJECT_TYPE_SPECIAL:
4909 case YAFFS_OBJECT_TYPE_SYMLINK:
4910 in->variant.symLinkVariant.
4912 yaffs_CloneString(oh->
4921 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4922 /* If we got this far while scanning, then the block is fully allocated. */
4923 state = YAFFS_BLOCK_STATE_FULL;
4926 bi->blockState = state;
4928 /* Now let's see if it was dirty */
4929 if (bi->pagesInUse == 0 &&
4930 !bi->hasShrinkHeader &&
4931 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
4932 yaffs_BlockBecameDirty(dev, blk);
4940 /* Ok, we've done all the scanning.
4941 * Fix up the hard link chains.
4942 * We should now have scanned all the objects, now it's time to add these
4947 hardList = (yaffs_Object *) (hardList->hardLinks.next);
4949 in = yaffs_FindObjectByNumber(dev,
4950 hl->variant.hardLinkVariant.
4951 equivalentObjectId);
4954 /* Add the hardlink pointers */
4955 hl->variant.hardLinkVariant.equivalentObject = in;
4956 list_add(&hl->hardLinks, &in->hardLinks);
4958 /* Todo Need to report/handle this better.
4959 * Got a problem... hardlink to a non-existant object
4961 hl->variant.hardLinkVariant.equivalentObject = NULL;
4962 INIT_LIST_HEAD(&hl->hardLinks);
4969 struct list_head *i;
4970 struct list_head *n;
4974 /* Soft delete all the unlinked files */
4975 list_for_each_safe(i, n,
4976 &dev->unlinkedDir->variant.directoryVariant.
4979 l = list_entry(i, yaffs_Object, siblings);
4980 yaffs_DestroyObject(l);
4984 /* Soft delete all the deletedDir files */
4985 list_for_each_safe(i, n,
4986 &dev->deletedDir->variant.directoryVariant.
4989 l = list_entry(i, yaffs_Object, siblings);
4990 yaffs_DestroyObject(l);
4996 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
4998 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
5003 /*------------------------------ Directory Functions ----------------------------- */
5005 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
5007 yaffs_Device *dev = obj->myDev;
5009 if(dev && dev->removeObjectCallback)
5010 dev->removeObjectCallback(obj);
5012 list_del_init(&obj->siblings);
5017 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
5022 T(YAFFS_TRACE_ALWAYS,
5024 ("tragedy: Trying to add an object to a null pointer directory"
5028 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
5029 T(YAFFS_TRACE_ALWAYS,
5031 ("tragedy: Trying to add an object to a non-directory"
5036 if (obj->siblings.prev == NULL) {
5037 /* Not initialised */
5038 INIT_LIST_HEAD(&obj->siblings);
5040 } else if (!list_empty(&obj->siblings)) {
5041 /* If it is holed up somewhere else, un hook it */
5042 yaffs_RemoveObjectFromDirectory(obj);
5045 list_add(&obj->siblings, &directory->variant.directoryVariant.children);
5046 obj->parent = directory;
5048 if (directory == obj->myDev->unlinkedDir
5049 || directory == obj->myDev->deletedDir) {
5051 obj->myDev->nUnlinkedFiles++;
5052 obj->renameAllowed = 0;
5056 yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
5061 struct list_head *i;
5062 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
5071 T(YAFFS_TRACE_ALWAYS,
5073 ("tragedy: yaffs_FindObjectByName: null pointer directory"
5077 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
5078 T(YAFFS_TRACE_ALWAYS,
5080 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
5084 sum = yaffs_CalcNameSum(name);
5086 list_for_each(i, &directory->variant.directoryVariant.children) {
5088 l = list_entry(i, yaffs_Object, siblings);
5090 /* Special case for lost-n-found */
5091 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
5092 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
5095 } else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
5097 /* LostnFound cunk called Objxxx
5100 yaffs_GetObjectName(l, buffer,
5101 YAFFS_MAX_NAME_LENGTH);
5102 if (yaffs_strcmp(name, buffer) == 0) {
5115 int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
5116 int (*fn) (yaffs_Object *))
5118 struct list_head *i;
5122 T(YAFFS_TRACE_ALWAYS,
5124 ("tragedy: yaffs_FindObjectByName: null pointer directory"
5128 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
5129 T(YAFFS_TRACE_ALWAYS,
5131 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
5135 list_for_each(i, &theDir->variant.directoryVariant.children) {
5137 l = list_entry(i, yaffs_Object, siblings);
5149 /* GetEquivalentObject dereferences any hard links to get to the
5153 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
5155 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5156 /* We want the object id of the equivalent object, not this one */
5157 obj = obj->variant.hardLinkVariant.equivalentObject;
5163 int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
5165 memset(name, 0, buffSize * sizeof(YCHAR));
5167 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
5168 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
5169 } else if (obj->chunkId <= 0) {
5171 /* make up a name */
5172 yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
5174 yaffs_strncpy(name, locName, buffSize - 1);
5177 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
5178 else if (obj->shortName[0]) {
5179 yaffs_strcpy(name, obj->shortName);
5183 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
5185 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
5187 memset(buffer, 0, obj->myDev->nBytesPerChunk);
5189 if (obj->chunkId >= 0) {
5190 yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
5191 obj->chunkId, buffer,
5194 yaffs_strncpy(name, oh->name, buffSize - 1);
5196 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
5199 return yaffs_strlen(name);
5202 int yaffs_GetObjectFileLength(yaffs_Object * obj)
5205 /* Dereference any hard linking */
5206 obj = yaffs_GetEquivalentObject(obj);
5208 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
5209 return obj->variant.fileVariant.fileSize;
5211 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
5212 return yaffs_strlen(obj->variant.symLinkVariant.alias);
5214 /* Only a directory should drop through to here */
5215 return obj->myDev->nBytesPerChunk;
5219 int yaffs_GetObjectLinkCount(yaffs_Object * obj)
5222 struct list_head *i;
5224 if (!obj->unlinked) {
5225 count++; /* the object itself */
5227 list_for_each(i, &obj->hardLinks) {
5228 count++; /* add the hard links; */
5234 int yaffs_GetObjectInode(yaffs_Object * obj)
5236 obj = yaffs_GetEquivalentObject(obj);
5238 return obj->objectId;
5241 unsigned yaffs_GetObjectType(yaffs_Object * obj)
5243 obj = yaffs_GetEquivalentObject(obj);
5245 switch (obj->variantType) {
5246 case YAFFS_OBJECT_TYPE_FILE:
5249 case YAFFS_OBJECT_TYPE_DIRECTORY:
5252 case YAFFS_OBJECT_TYPE_SYMLINK:
5255 case YAFFS_OBJECT_TYPE_HARDLINK:
5258 case YAFFS_OBJECT_TYPE_SPECIAL:
5259 if (S_ISFIFO(obj->yst_mode))
5261 if (S_ISCHR(obj->yst_mode))
5263 if (S_ISBLK(obj->yst_mode))
5265 if (S_ISSOCK(obj->yst_mode))
5273 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
5275 obj = yaffs_GetEquivalentObject(obj);
5276 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
5277 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
5279 return yaffs_CloneString(_Y(""));
5283 #ifndef CONFIG_YAFFS_WINCE
5285 int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
5287 unsigned int valid = attr->ia_valid;
5289 if (valid & ATTR_MODE)
5290 obj->yst_mode = attr->ia_mode;
5291 if (valid & ATTR_UID)
5292 obj->yst_uid = attr->ia_uid;
5293 if (valid & ATTR_GID)
5294 obj->yst_gid = attr->ia_gid;
5296 if (valid & ATTR_ATIME)
5297 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
5298 if (valid & ATTR_CTIME)
5299 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
5300 if (valid & ATTR_MTIME)
5301 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
5303 if (valid & ATTR_SIZE)
5304 yaffs_ResizeFile(obj, attr->ia_size);
5306 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
5311 int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
5313 unsigned int valid = 0;
5315 attr->ia_mode = obj->yst_mode;
5317 attr->ia_uid = obj->yst_uid;
5319 attr->ia_gid = obj->yst_gid;
5322 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
5323 valid |= ATTR_ATIME;
5324 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
5325 valid |= ATTR_CTIME;
5326 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
5327 valid |= ATTR_MTIME;
5329 attr->ia_size = yaffs_GetFileSize(obj);
5332 attr->ia_valid = valid;
5341 int yaffs_DumpObject(yaffs_Object * obj)
5345 yaffs_GetObjectName(obj, name, 256);
5347 T(YAFFS_TRACE_ALWAYS,
5349 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
5350 " chunk %d type %d size %d\n"
5351 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
5352 obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
5353 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
5359 /*---------------------------- Initialisation code -------------------------------------- */
5361 static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
5364 /* Common functions, gotta have */
5365 if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
5368 #ifdef CONFIG_YAFFS_YAFFS2
5370 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
5371 if (dev->writeChunkWithTagsToNAND &&
5372 dev->readChunkWithTagsFromNAND &&
5373 !dev->writeChunkToNAND &&
5374 !dev->readChunkFromNAND &&
5375 dev->markNANDBlockBad && dev->queryNANDBlock)
5379 /* Can use the "spare" style interface for yaffs1 */
5380 if (!dev->isYaffs2 &&
5381 !dev->writeChunkWithTagsToNAND &&
5382 !dev->readChunkWithTagsFromNAND &&
5383 dev->writeChunkToNAND &&
5384 dev->readChunkFromNAND &&
5385 !dev->markNANDBlockBad && !dev->queryNANDBlock)
5391 int yaffs_GutsInitialise(yaffs_Device * dev)
5398 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
5400 /* Check stuff that must be set */
5403 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
5407 dev->internalStartBlock = dev->startBlock;
5408 dev->internalEndBlock = dev->endBlock;
5409 dev->blockOffset = 0;
5410 dev->chunkOffset = 0;
5411 dev->nFreeChunks = 0;
5413 if (dev->startBlock == 0) {
5414 dev->internalStartBlock = dev->startBlock + 1;
5415 dev->internalEndBlock = dev->endBlock + 1;
5416 dev->blockOffset = 1;
5417 dev->chunkOffset = dev->nChunksPerBlock;
5420 /* Check geometry parameters. */
5422 if ((dev->isYaffs2 && dev->nBytesPerChunk < 1024) || (!dev->isYaffs2 && dev->nBytesPerChunk != 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
5424 T(YAFFS_TRACE_ALWAYS,
5426 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
5427 TENDSTR), dev->nBytesPerChunk, dev->isYaffs2 ? "2" : ""));
5431 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
5432 T(YAFFS_TRACE_ALWAYS,
5433 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
5437 /* Got the right mix of functions? */
5438 if (!yaffs_CheckDevFunctions(dev)) {
5439 /* Function missing */
5440 T(YAFFS_TRACE_ALWAYS,
5442 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
5447 /* This is really a compilation check. */
5448 if (!yaffs_CheckStructures()) {
5449 T(YAFFS_TRACE_ALWAYS,
5450 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
5454 if (dev->isMounted) {
5455 T(YAFFS_TRACE_ALWAYS,
5456 (TSTR("yaffs: device already mounted\n" TENDSTR)));
5460 /* Finished with most checks. One or two more checks happen later on too. */
5464 nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5466 /* OK now calculate a few things for the device
5467 * Calculate chunkGroupBits.
5468 * We need to find the next power of 2 > than internalEndBlock
5471 x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
5473 for (bits = extraBits = 0; x > 1; bits++) {
5482 /* Set up tnode width if wide tnodes are enabled. */
5483 if(!dev->wideTnodesDisabled){
5484 /* bits must be even so that we end up with 32-bit words */
5488 dev->tnodeWidth = 16;
5490 dev->tnodeWidth = bits;
5493 dev->tnodeWidth = 16;
5495 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
5497 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
5498 * so if the bitwidth of the
5499 * chunk range we're using is greater than 16 we need
5500 * to figure out chunk shift and chunkGroupSize
5503 if (bits <= dev->tnodeWidth)
5504 dev->chunkGroupBits = 0;
5506 dev->chunkGroupBits = bits - dev->tnodeWidth;
5509 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
5511 if (dev->nChunksPerBlock < dev->chunkGroupSize) {
5512 /* We have a problem because the soft delete won't work if
5513 * the chunk group size > chunks per block.
5514 * This can be remedied by using larger "virtual blocks".
5516 T(YAFFS_TRACE_ALWAYS,
5517 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
5522 /* OK, we've finished verifying the device, lets continue with initialisation */
5524 /* More device initialisation */
5525 dev->garbageCollections = 0;
5526 dev->passiveGarbageCollections = 0;
5527 dev->currentDirtyChecker = 0;
5528 dev->bufferedBlock = -1;
5529 dev->doingBufferedBlockRewrite = 0;
5530 dev->nDeletedFiles = 0;
5531 dev->nBackgroundDeletions = 0;
5532 dev->nUnlinkedFiles = 0;
5534 dev->eccUnfixed = 0;
5535 dev->tagsEccFixed = 0;
5536 dev->tagsEccUnfixed = 0;
5537 dev->nErasureFailures = 0;
5538 dev->nErasedBlocks = 0;
5541 /* Initialise temporary buffers */
5544 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
5545 dev->tempBuffer[i].line = 0; /* not in use */
5546 dev->tempBuffer[i].buffer =
5547 YMALLOC(dev->nBytesPerChunk);
5551 yaffs_InitialiseBlocks(dev, nBlocks);
5553 yaffs_InitialiseTnodes(dev);
5555 yaffs_InitialiseObjects(dev);
5557 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
5559 if (dev->nShortOpCaches > 0) {
5562 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
5563 dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
5567 YMALLOC(dev->nShortOpCaches * sizeof(yaffs_ChunkCache));
5569 for (i = 0; i < dev->nShortOpCaches; i++) {
5570 dev->srCache[i].object = NULL;
5571 dev->srCache[i].lastUse = 0;
5572 dev->srCache[i].dirty = 0;
5573 dev->srCache[i].data = YMALLOC(dev->nBytesPerChunk);
5580 /* Initialise the unlinked, root and lost and found directories */
5581 dev->lostNFoundDir = dev->rootDir = NULL;
5582 dev->unlinkedDir = dev->deletedDir = NULL;
5585 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
5587 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
5590 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
5591 YAFFS_ROOT_MODE | S_IFDIR);
5592 dev->lostNFoundDir =
5593 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
5594 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
5595 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
5597 if (dev->isYaffs2) {
5598 dev->useHeaderFileSize = 1;
5601 /* Now scan the flash. */
5603 yaffs_ScanBackwards(dev);
5607 /* Zero out stats */
5608 dev->nPageReads = 0;
5609 dev->nPageWrites = 0;
5610 dev->nBlockErasures = 0;
5612 dev->nRetriedWrites = 0;
5614 dev->nRetiredBlocks = 0;
5616 yaffs_VerifyFreeChunks(dev);
5618 T(YAFFS_TRACE_TRACING,
5619 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
5624 void yaffs_Deinitialise(yaffs_Device * dev)
5626 if (dev->isMounted) {
5629 yaffs_DeinitialiseBlocks(dev);
5630 yaffs_DeinitialiseTnodes(dev);
5631 yaffs_DeinitialiseObjects(dev);
5632 if (dev->nShortOpCaches > 0) {
5634 for (i = 0; i < dev->nShortOpCaches; i++) {
5635 YFREE(dev->srCache[i].data);
5638 YFREE(dev->srCache);
5641 YFREE(dev->gcCleanupList);
5643 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
5644 YFREE(dev->tempBuffer[i].buffer);
5652 static int yaffs_CountFreeChunks(yaffs_Device * dev)
5657 yaffs_BlockInfo *blk;
5659 for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
5661 blk = yaffs_GetBlockInfo(dev, b);
5663 switch (blk->blockState) {
5664 case YAFFS_BLOCK_STATE_EMPTY:
5665 case YAFFS_BLOCK_STATE_ALLOCATING:
5666 case YAFFS_BLOCK_STATE_COLLECTING:
5667 case YAFFS_BLOCK_STATE_FULL:
5669 (dev->nChunksPerBlock - blk->pagesInUse +
5670 blk->softDeletions);
5681 int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
5683 /* This is what we report to the outside world */
5686 int nDirtyCacheChunks;
5689 nFree = dev->nFreeChunks;
5691 nFree = yaffs_CountFreeChunks(dev);
5694 /* Now count the number of dirty chunks in the cache and subtract those */
5698 for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
5699 if (dev->srCache[i].dirty)
5700 nDirtyCacheChunks++;
5704 nFree -= nDirtyCacheChunks;
5706 nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
5715 static int yaffs_freeVerificationFailures;
5717 static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
5719 int counted = yaffs_CountFreeChunks(dev);
5721 int difference = dev->nFreeChunks - counted;
5724 T(YAFFS_TRACE_ALWAYS,
5725 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
5726 dev->nFreeChunks, counted, difference));
5727 yaffs_freeVerificationFailures++;
5731 /*---------------------------------------- YAFFS test code ----------------------*/
5733 #define yaffs_CheckStruct(structure,syze, name) \
5734 if(sizeof(structure) != syze) \
5736 T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
5737 name,syze,sizeof(structure))); \
5738 return YAFFS_FAIL; \
5741 static int yaffs_CheckStructures(void)
5743 /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
5744 /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
5745 /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
5746 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
5747 yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
5749 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")