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 1.19 2005-09-20 05:08:50 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)
338 return (n % YAFFS_NOBJECT_BUCKETS);
342 * Access functions to useful fake objects
345 yaffs_Object *yaffs_Root(yaffs_Device * dev)
350 yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
352 return dev->lostNFoundDir;
357 * Erased NAND checking functions
360 int yaffs_CheckFF(__u8 * buffer, int nBytes)
362 /* Horrible, slow implementation */
371 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
375 int retval = YAFFS_OK;
376 __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
377 yaffs_ExtendedTags tags;
379 yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
381 if (!yaffs_CheckFF(data, dev->nBytesPerChunk) || tags.chunkUsed) {
382 T(YAFFS_TRACE_NANDACCESS,
383 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
387 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
393 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
395 yaffs_ExtendedTags * tags,
404 chunk = yaffs_AllocateChunk(dev, useReserve);
408 /* First check this chunk is erased... */
409 #ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
410 writeOk = yaffs_CheckChunkErased(dev, chunk);
415 ("**>> yaffs chunk %d was not erased"
419 yaffs_WriteChunkWithTagsToNAND(dev, chunk,
426 * Copy the data into the robustification buffer.
427 * NB We do this at the end to prevent duplicates in the case of a write error.
430 yaffs_HandleWriteChunkOk(dev, chunk, data,
433 yaffs_HandleWriteChunkError(dev, chunk);
437 } while (chunk >= 0 && !writeOk);
441 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
443 dev->nRetriedWrites += (attempts - 1);
450 * Block retiring for handling a broken block.
453 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
456 yaffs_MarkBlockBad(dev, blockInNAND);
458 yaffs_GetBlockInfo(dev, blockInNAND)->blockState =
459 YAFFS_BLOCK_STATE_DEAD;
461 dev->nRetiredBlocks++;
465 * Functions for robustisizing TODO
469 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
471 const yaffs_ExtendedTags * tags)
475 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
476 const yaffs_ExtendedTags * tags)
480 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND)
482 int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
484 /* Mark the block for retirement */
485 yaffs_GetBlockInfo(dev, blockInNAND)->needsRetiring = 1;
486 /* Delete the chunk */
487 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
491 /*---------------- Name handling functions ------------*/
493 static __u16 yaffs_CalcNameSum(const YCHAR * name)
498 YUCHAR *bname = (YUCHAR *) name;
500 while ((*bname) && (i <= YAFFS_MAX_NAME_LENGTH)) {
502 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
503 sum += yaffs_toupper(*bname) * i;
514 static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
516 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
517 if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
518 yaffs_strcpy(obj->shortName, name);
520 obj->shortName[0] = _Y('\0');
523 obj->sum = yaffs_CalcNameSum(name);
526 /*-------------------- TNODES -------------------
528 * List of spare tnodes
529 * The list is hooked together using the first pointer
533 /* yaffs_CreateTnodes creates a bunch more tnodes and
534 * adds them to the tnode free list.
535 * Don't use this function directly
538 static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
541 yaffs_Tnode *newTnodes;
542 yaffs_TnodeList *tnl;
547 /* make these things */
549 newTnodes = YMALLOC(nTnodes * sizeof(yaffs_Tnode));
553 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
557 /* Hook them into the free list */
558 for (i = 0; i < nTnodes - 1; i++) {
559 newTnodes[i].internal[0] = &newTnodes[i + 1];
560 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
561 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
565 newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
566 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
567 newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
569 dev->freeTnodes = newTnodes;
570 dev->nFreeTnodes += nTnodes;
571 dev->nTnodesCreated += nTnodes;
573 /* Now add this bunch of tnodes to a list for freeing up.
574 * NB If we can't add this to the management list it isn't fatal
575 * but it just means we can't free this bunch of tnodes later.
578 tnl = YMALLOC(sizeof(yaffs_TnodeList));
582 ("yaffs: Could not add tnodes to management list" TENDSTR)));
585 tnl->tnodes = newTnodes;
586 tnl->next = dev->allocatedTnodeList;
587 dev->allocatedTnodeList = tnl;
590 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
595 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
597 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
599 yaffs_Tnode *tn = NULL;
601 /* If there are none left make more */
602 if (!dev->freeTnodes) {
603 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
606 if (dev->freeTnodes) {
607 tn = dev->freeTnodes;
608 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
609 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
610 /* Hoosterman, this thing looks like it isn't in the list */
611 T(YAFFS_TRACE_ALWAYS,
612 (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
615 dev->freeTnodes = dev->freeTnodes->internal[0];
618 memset(tn, 0, sizeof(yaffs_Tnode));
624 /* FreeTnode frees up a tnode and puts it back on the free list */
625 static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
628 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
629 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
630 /* Hoosterman, this thing looks like it is already in the list */
631 T(YAFFS_TRACE_ALWAYS,
632 (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
634 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
636 tn->internal[0] = dev->freeTnodes;
637 dev->freeTnodes = tn;
642 static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
644 /* Free the list of allocated tnodes */
645 yaffs_TnodeList *tmp;
647 while (dev->allocatedTnodeList) {
648 tmp = dev->allocatedTnodeList->next;
650 YFREE(dev->allocatedTnodeList->tnodes);
651 YFREE(dev->allocatedTnodeList);
652 dev->allocatedTnodeList = tmp;
656 dev->freeTnodes = NULL;
657 dev->nFreeTnodes = 0;
660 static void yaffs_InitialiseTnodes(yaffs_Device * dev)
662 dev->allocatedTnodeList = NULL;
663 dev->freeTnodes = NULL;
664 dev->nFreeTnodes = 0;
665 dev->nTnodesCreated = 0;
669 /* ------------------- End of individual tnode manipulation -----------------*/
671 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
672 * The look up tree is represented by the top tnode and the number of topLevel
673 * in the tree. 0 means only the level 0 tnode is in the tree.
676 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
677 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
678 yaffs_FileStructure * fStruct,
682 yaffs_Tnode *tn = fStruct->top;
684 int requiredTallness;
685 int level = fStruct->topLevel;
687 /* Check sane level and chunk Id */
688 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
692 if (chunkId > YAFFS_MAX_CHUNK_ID) {
696 /* First check we're tall enough (ie enough topLevel) */
698 i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
699 requiredTallness = 0;
701 i >>= YAFFS_TNODES_INTERNAL_BITS;
705 if (requiredTallness > fStruct->topLevel) {
706 /* Not tall enough, so we can't find it, return NULL. */
710 /* Traverse down to level 0 */
711 while (level > 0 && tn) {
714 ( YAFFS_TNODES_LEVEL0_BITS +
716 YAFFS_TNODES_INTERNAL_BITS)
718 YAFFS_TNODES_INTERNAL_MASK];
726 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
727 * This happens in two steps:
728 * 1. If the tree isn't tall enough, then make it taller.
729 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
731 * Used when modifying the tree.
734 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
735 yaffs_FileStructure * fStruct,
741 int requiredTallness;
748 /* Check sane level and page Id */
749 if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
753 if (chunkId > YAFFS_MAX_CHUNK_ID) {
757 /* First check we're tall enough (ie enough topLevel) */
759 x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
760 requiredTallness = 0;
762 x >>= YAFFS_TNODES_INTERNAL_BITS;
767 if (requiredTallness > fStruct->topLevel) {
768 /* Not tall enough,gotta make the tree taller */
769 for (i = fStruct->topLevel; i < requiredTallness; i++) {
771 tn = yaffs_GetTnode(dev);
774 tn->internal[0] = fStruct->top;
778 (TSTR("yaffs: no more tnodes" TENDSTR)));
782 fStruct->topLevel = requiredTallness;
785 /* Traverse down to level 0, adding anything we need */
787 l = fStruct->topLevel;
789 while (l > 0 && tn) {
791 ( YAFFS_TNODES_LEVEL0_BITS +
792 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
793 YAFFS_TNODES_INTERNAL_MASK;
796 if (!tn->internal[x])
797 tn->internal[x] = yaffs_GetTnode(dev);
799 tn = tn->internal[x];
807 static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
808 yaffs_ExtendedTags * tags, int objectId,
813 for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
814 if (yaffs_CheckChunkBit
815 (dev, theChunk / dev->nChunksPerBlock,
816 theChunk % dev->nChunksPerBlock)) {
817 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
819 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
831 /* DeleteWorker scans backwards through the tnode tree and deletes all the
832 * chunks and tnodes in the file
833 * Returns 1 if the tree was deleted.
834 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
837 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
838 int chunkOffset, int *limit)
843 yaffs_ExtendedTags tags;
845 yaffs_Device *dev = in->myDev;
852 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
854 if (tn->internal[i]) {
855 if (limit && (*limit) < 0) {
859 yaffs_DeleteWorker(in,
867 YAFFS_TNODES_INTERNAL_BITS)
875 tn->internal[i] = NULL;
880 return (allDone) ? 1 : 0;
881 } else if (level == 0) {
884 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
890 YAFFS_TNODES_LEVEL0_BITS) + i;
893 tn->level0[i] << dev->
897 yaffs_FindChunkInGroup(dev,
903 if (foundChunk > 0) {
904 yaffs_DeleteChunk(dev,
921 return (i < 0) ? 1 : 0;
931 static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
934 yaffs_BlockInfo *theBlock;
936 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
938 theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
940 theBlock->softDeletions++;
945 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
946 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
948 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
951 static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
952 __u32 level, int chunkOffset)
957 yaffs_Device *dev = in->myDev;
962 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
964 if (tn->internal[i]) {
966 yaffs_SoftDeleteWorker(in,
972 YAFFS_TNODES_INTERNAL_BITS)
978 tn->internal[i] = NULL;
980 /* Hoosterman... how could this happen? */
984 return (allDone) ? 1 : 0;
985 } else if (level == 0) {
987 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
989 /* Note this does not find the real chunk, only the chunk group.
990 * We make an assumption that a chunk group is not larger than
994 (tn->level0[i] << dev->
997 yaffs_SoftDeleteChunk(dev, theChunk);
1012 static void yaffs_SoftDeleteFile(yaffs_Object * obj)
1015 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1016 if (obj->nDataChunks <= 0) {
1017 /* Empty file with no duplicate object headers, just delete it immediately */
1018 yaffs_FreeTnode(obj->myDev,
1019 obj->variant.fileVariant.top);
1020 obj->variant.fileVariant.top = NULL;
1021 T(YAFFS_TRACE_TRACING,
1022 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1024 yaffs_DoGenericObjectDeletion(obj);
1026 yaffs_SoftDeleteWorker(obj,
1027 obj->variant.fileVariant.top,
1028 obj->variant.fileVariant.
1030 obj->softDeleted = 1;
1035 /* Pruning removes any part of the file structure tree that is beyond the
1036 * bounds of the file (ie that does not point to chunks).
1038 * A file should only get pruned when its size is reduced.
1040 * Before pruning, the chunks must be pulled from the tree and the
1041 * level 0 tnode entries must be zeroed out.
1042 * Could also use this for file deletion, but that's probably better handled
1043 * by a special case.
1046 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
1047 __u32 level, int del0)
1055 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1056 if (tn->internal[i] && level > 0) {
1058 yaffs_PruneWorker(dev, tn->internal[i],
1060 (i == 0) ? del0 : 1);
1063 if (tn->internal[i]) {
1068 if (hasData == 0 && del0) {
1069 /* Free and return NULL */
1071 yaffs_FreeTnode(dev, tn);
1081 static int yaffs_PruneFileStructure(yaffs_Device * dev,
1082 yaffs_FileStructure * fStruct)
1089 if (fStruct->topLevel > 0) {
1091 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1093 /* Now we have a tree with all the non-zero branches NULL but the height
1094 * is the same as it was.
1095 * Let's see if we can trim internal tnodes to shorten the tree.
1096 * We can do this if only the 0th element in the tnode is in use
1097 * (ie all the non-zero are NULL)
1100 while (fStruct->topLevel && !done) {
1104 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1105 if (tn->internal[i]) {
1111 fStruct->top = tn->internal[0];
1112 fStruct->topLevel--;
1113 yaffs_FreeTnode(dev, tn);
1123 /*-------------------- End of File Structure functions.-------------------*/
1125 /* yaffs_CreateFreeObjects creates a bunch more objects and
1126 * adds them to the object free list.
1128 static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
1131 yaffs_Object *newObjects;
1132 yaffs_ObjectList *list;
1137 /* make these things */
1138 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1141 T(YAFFS_TRACE_ALLOCATE,
1142 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1146 /* Hook them into the free list */
1147 for (i = 0; i < nObjects - 1; i++) {
1148 newObjects[i].siblings.next =
1149 (struct list_head *)(&newObjects[i + 1]);
1152 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1153 dev->freeObjects = newObjects;
1154 dev->nFreeObjects += nObjects;
1155 dev->nObjectsCreated += nObjects;
1157 /* Now add this bunch of Objects to a list for freeing up. */
1159 list = YMALLOC(sizeof(yaffs_ObjectList));
1161 T(YAFFS_TRACE_ALLOCATE,
1162 (TSTR("Could not add objects to management list" TENDSTR)));
1164 list->objects = newObjects;
1165 list->next = dev->allocatedObjectList;
1166 dev->allocatedObjectList = list;
1173 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1174 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
1176 yaffs_Object *tn = NULL;
1178 /* If there are none left make more */
1179 if (!dev->freeObjects) {
1180 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1183 if (dev->freeObjects) {
1184 tn = dev->freeObjects;
1186 (yaffs_Object *) (dev->freeObjects->siblings.next);
1187 dev->nFreeObjects--;
1189 /* Now sweeten it up... */
1191 memset(tn, 0, sizeof(yaffs_Object));
1194 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1195 INIT_LIST_HEAD(&(tn->hardLinks));
1196 INIT_LIST_HEAD(&(tn->hashLink));
1197 INIT_LIST_HEAD(&tn->siblings);
1199 /* Add it to the lost and found directory.
1200 * NB Can't put root or lostNFound in lostNFound so
1201 * check if lostNFound exists first
1203 if (dev->lostNFoundDir) {
1204 yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1211 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
1216 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1218 obj->fake = 1; /* it is fake so it has no NAND presence... */
1219 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1220 obj->unlinkAllowed = 0; /* ... or unlink it */
1223 obj->yst_mode = mode;
1225 obj->chunkId = 0; /* Not a valid chunk. */
1232 static void yaffs_UnhashObject(yaffs_Object * tn)
1235 yaffs_Device *dev = tn->myDev;
1237 /* If it is still linked into the bucket list, free from the list */
1238 if (!list_empty(&tn->hashLink)) {
1239 list_del_init(&tn->hashLink);
1240 bucket = yaffs_HashFunction(tn->objectId);
1241 dev->objectBucket[bucket].count--;
1246 /* FreeObject frees up a Object and puts it back on the free list */
1247 static void yaffs_FreeObject(yaffs_Object * tn)
1250 yaffs_Device *dev = tn->myDev;
1254 /* We're still hooked up to a cached inode.
1255 * Don't delete now, but mark for later deletion
1257 tn->deferedFree = 1;
1262 yaffs_UnhashObject(tn);
1264 /* Link into the free list. */
1265 tn->siblings.next = (struct list_head *)(dev->freeObjects);
1266 dev->freeObjects = tn;
1267 dev->nFreeObjects++;
1272 void yaffs_HandleDeferedFree(yaffs_Object * obj)
1274 if (obj->deferedFree) {
1275 yaffs_FreeObject(obj);
1281 static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
1283 /* Free the list of allocated Objects */
1285 yaffs_ObjectList *tmp;
1287 while (dev->allocatedObjectList) {
1288 tmp = dev->allocatedObjectList->next;
1289 YFREE(dev->allocatedObjectList->objects);
1290 YFREE(dev->allocatedObjectList);
1292 dev->allocatedObjectList = tmp;
1295 dev->freeObjects = NULL;
1296 dev->nFreeObjects = 0;
1299 static void yaffs_InitialiseObjects(yaffs_Device * dev)
1303 dev->allocatedObjectList = NULL;
1304 dev->freeObjects = NULL;
1305 dev->nFreeObjects = 0;
1307 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
1308 INIT_LIST_HEAD(&dev->objectBucket[i].list);
1309 dev->objectBucket[i].count = 0;
1314 static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
1319 int lowest = 999999;
1321 /* First let's see if we can find one that's empty. */
1323 for (i = 0; i < 10 && lowest > 0; i++) {
1325 x %= YAFFS_NOBJECT_BUCKETS;
1326 if (dev->objectBucket[x].count < lowest) {
1327 lowest = dev->objectBucket[x].count;
1333 /* If we didn't find an empty list, then try
1334 * looking a bit further for a short one
1337 for (i = 0; i < 10 && lowest > 3; i++) {
1339 x %= YAFFS_NOBJECT_BUCKETS;
1340 if (dev->objectBucket[x].count < lowest) {
1341 lowest = dev->objectBucket[x].count;
1350 static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
1352 int bucket = yaffs_FindNiceObjectBucket(dev);
1354 /* Now find an object value that has not already been taken
1355 * by scanning the list.
1359 struct list_head *i;
1361 __u32 n = (__u32) bucket;
1363 /* yaffs_CheckObjectHashSanity(); */
1367 n += YAFFS_NOBJECT_BUCKETS;
1368 if (1 || dev->objectBucket[bucket].count > 0) {
1369 list_for_each(i, &dev->objectBucket[bucket].list) {
1370 /* If there is already one in the list */
1372 && list_entry(i, yaffs_Object,
1373 hashLink)->objectId == n) {
1384 static void yaffs_HashObject(yaffs_Object * in)
1386 int bucket = yaffs_HashFunction(in->objectId);
1387 yaffs_Device *dev = in->myDev;
1389 list_add(&in->hashLink, &dev->objectBucket[bucket].list);
1390 dev->objectBucket[bucket].count++;
1394 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
1396 int bucket = yaffs_HashFunction(number);
1397 struct list_head *i;
1400 list_for_each(i, &dev->objectBucket[bucket].list) {
1401 /* Look if it is in the list */
1403 in = list_entry(i, yaffs_Object, hashLink);
1404 if (in->objectId == number) {
1406 /* Don't tell the VFS about this one if it is defered free */
1407 if (in->deferedFree)
1419 yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
1420 yaffs_ObjectType type)
1423 yaffs_Object *theObject;
1426 number = yaffs_CreateNewObjectNumber(dev);
1429 theObject = yaffs_AllocateEmptyObject(dev);
1432 theObject->fake = 0;
1433 theObject->renameAllowed = 1;
1434 theObject->unlinkAllowed = 1;
1435 theObject->objectId = number;
1436 yaffs_HashObject(theObject);
1437 theObject->variantType = type;
1438 #ifdef CONFIG_YAFFS_WINCE
1439 yfsd_WinFileTimeNow(theObject->win_atime);
1440 theObject->win_ctime[0] = theObject->win_mtime[0] =
1441 theObject->win_atime[0];
1442 theObject->win_ctime[1] = theObject->win_mtime[1] =
1443 theObject->win_atime[1];
1447 theObject->yst_atime = theObject->yst_mtime =
1448 theObject->yst_ctime = Y_CURRENT_TIME;
1451 case YAFFS_OBJECT_TYPE_FILE:
1452 theObject->variant.fileVariant.fileSize = 0;
1453 theObject->variant.fileVariant.scannedFileSize = 0;
1454 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
1455 theObject->variant.fileVariant.topLevel = 0;
1456 theObject->variant.fileVariant.top =
1457 yaffs_GetTnode(dev);
1459 case YAFFS_OBJECT_TYPE_DIRECTORY:
1460 INIT_LIST_HEAD(&theObject->variant.directoryVariant.
1463 case YAFFS_OBJECT_TYPE_SYMLINK:
1464 case YAFFS_OBJECT_TYPE_HARDLINK:
1465 case YAFFS_OBJECT_TYPE_SPECIAL:
1466 /* No action required */
1468 case YAFFS_OBJECT_TYPE_UNKNOWN:
1469 /* todo this should not happen */
1477 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
1479 yaffs_ObjectType type)
1481 yaffs_Object *theObject = NULL;
1484 theObject = yaffs_FindObjectByNumber(dev, number);
1488 theObject = yaffs_CreateNewObject(dev, number, type);
1495 static YCHAR *yaffs_CloneString(const YCHAR * str)
1497 YCHAR *newStr = NULL;
1500 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
1501 yaffs_strcpy(newStr, str);
1509 * Mknod (create) a new object.
1510 * equivalentObject only has meaning for a hard link;
1511 * aliasString only has meaning for a sumlink.
1512 * rdev only has meaning for devices (a subset of special objects)
1515 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
1516 yaffs_Object * parent,
1521 yaffs_Object * equivalentObject,
1522 const YCHAR * aliasString, __u32 rdev)
1526 yaffs_Device *dev = parent->myDev;
1528 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
1529 if (yaffs_FindObjectByName(parent, name)) {
1533 in = yaffs_CreateNewObject(dev, -1, type);
1538 in->variantType = type;
1540 in->yst_mode = mode;
1542 #ifdef CONFIG_YAFFS_WINCE
1543 yfsd_WinFileTimeNow(in->win_atime);
1544 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
1545 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
1548 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
1550 in->yst_rdev = rdev;
1554 in->nDataChunks = 0;
1556 yaffs_SetObjectName(in, name);
1559 yaffs_AddObjectToDirectory(parent, in);
1561 in->myDev = parent->myDev;
1564 case YAFFS_OBJECT_TYPE_SYMLINK:
1565 in->variant.symLinkVariant.alias =
1566 yaffs_CloneString(aliasString);
1568 case YAFFS_OBJECT_TYPE_HARDLINK:
1569 in->variant.hardLinkVariant.equivalentObject =
1571 in->variant.hardLinkVariant.equivalentObjectId =
1572 equivalentObject->objectId;
1573 list_add(&in->hardLinks, &equivalentObject->hardLinks);
1575 case YAFFS_OBJECT_TYPE_FILE:
1576 case YAFFS_OBJECT_TYPE_DIRECTORY:
1577 case YAFFS_OBJECT_TYPE_SPECIAL:
1578 case YAFFS_OBJECT_TYPE_UNKNOWN:
1583 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
1584 /* Could not create the object header, fail the creation */
1585 yaffs_DestroyObject(in);
1594 yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
1595 __u32 mode, __u32 uid, __u32 gid)
1597 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
1598 uid, gid, NULL, NULL, 0);
1601 yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
1602 __u32 mode, __u32 uid, __u32 gid)
1604 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
1605 mode, uid, gid, NULL, NULL, 0);
1608 yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
1609 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
1611 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
1612 uid, gid, NULL, NULL, rdev);
1615 yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
1616 __u32 mode, __u32 uid, __u32 gid,
1617 const YCHAR * alias)
1619 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
1620 uid, gid, NULL, alias, 0);
1623 /* yaffs_Link returns the object id of the equivalent object.*/
1624 yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
1625 yaffs_Object * equivalentObject)
1627 /* Get the real object in case we were fed a hard link as an equivalent object */
1628 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
1630 if (yaffs_MknodObject
1631 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
1632 equivalentObject, NULL, 0)) {
1633 return equivalentObject;
1640 static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
1641 const YCHAR * newName, int force, int shadows)
1646 yaffs_Object *existingTarget;
1648 if (newDir == NULL) {
1649 newDir = obj->parent; /* use the old directory */
1652 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
1653 T(YAFFS_TRACE_ALWAYS,
1655 ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
1660 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
1661 if (obj->myDev->isYaffs2) {
1662 unlinkOp = (newDir == obj->myDev->unlinkedDir);
1664 unlinkOp = (newDir == obj->myDev->unlinkedDir
1665 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
1668 deleteOp = (newDir == obj->myDev->deletedDir);
1670 existingTarget = yaffs_FindObjectByName(newDir, newName);
1672 /* If the object is a file going into the unlinked directory,
1673 * then it is OK to just stuff it in since duplicate names are allowed.
1674 * else only proceed if the new name does not exist and if we're putting
1675 * it into a directory.
1682 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
1683 yaffs_SetObjectName(obj, newName);
1686 yaffs_AddObjectToDirectory(newDir, obj);
1691 /* If it is a deletion then we mark it as a shrink for gc purposes. */
1692 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
1699 int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
1700 yaffs_Object * newDir, const YCHAR * newName)
1703 yaffs_Object *existingTarget;
1706 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1707 /* Special case for case insemsitive systems (eg. WinCE).
1708 * While look-up is case insensitive, the name isn't.
1709 * Therefore we might want to change x.txt to X.txt
1711 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
1716 obj = yaffs_FindObjectByName(oldDir, oldName);
1718 if (obj && obj->renameAllowed) {
1720 /* Now do the handling for an existing target, if there is one */
1722 existingTarget = yaffs_FindObjectByName(newDir, newName);
1723 if (existingTarget &&
1724 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1725 !list_empty(&existingTarget->variant.directoryVariant.children)) {
1726 /* There is a target that is a non-empty directory, so we fail */
1727 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
1728 } else if (existingTarget && existingTarget != obj) {
1729 /* Nuke the target first, using shadowing,
1730 * but only if it isn't the same object
1732 yaffs_ChangeObjectName(obj, newDir, newName, force,
1733 existingTarget->objectId);
1734 yaffs_UnlinkObject(existingTarget);
1737 return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
1742 /*------------------------- Block Management and Page Allocation ----------------*/
1744 static int yaffs_InitialiseBlocks(yaffs_Device * dev, int nBlocks)
1746 dev->allocationBlock = -1; /* force it to get a new one */
1748 /* Todo we're assuming the malloc will pass. */
1749 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
1751 /* Set up dynamic blockinfo stuff. */
1752 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8;
1753 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
1754 if (dev->blockInfo && dev->chunkBits) {
1755 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
1756 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
1764 static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
1766 YFREE(dev->blockInfo);
1767 dev->blockInfo = NULL;
1768 YFREE(dev->chunkBits);
1769 dev->chunkBits = NULL;
1772 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
1773 yaffs_BlockInfo * bi)
1780 return 1; /* disqualification only applies to yaffs2. */
1782 if (!bi->hasShrinkHeader)
1783 return 1; /* can gc */
1785 /* Find the oldest dirty sequence number if we don't know it and save it
1786 * so we don't have to keep recomputing it.
1788 if (!dev->oldestDirtySequence) {
1789 seq = dev->sequenceNumber;
1791 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
1793 b = yaffs_GetBlockInfo(dev, i);
1794 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
1795 (b->pagesInUse - b->softDeletions) <
1796 dev->nChunksPerBlock && b->sequenceNumber < seq) {
1797 seq = b->sequenceNumber;
1800 dev->oldestDirtySequence = seq;
1803 /* Can't do gc of this block if there are any blocks older than this one that have
1806 return (bi->sequenceNumber <= dev->oldestDirtySequence);
1812 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
1813 * for garbage collection.
1816 static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
1820 int b = dev->currentDirtyChecker;
1826 yaffs_BlockInfo *bi;
1827 static int nonAggressiveSkip = 0;
1829 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
1831 * else (we're doing a leasurely gc), then we only bother to do this if the
1832 * block has only a few pages in use.
1835 nonAggressiveSkip--;
1837 if (!aggressive && (nonAggressiveSkip > 0)) {
1842 (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
1846 dev->internalEndBlock - dev->internalStartBlock + 1;
1849 dev->internalEndBlock - dev->internalStartBlock + 1;
1850 iterations = iterations / 16;
1851 if (iterations > 200) {
1856 for (i = 0; i <= iterations && pagesInUse > 0; i++) {
1858 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
1859 b = dev->internalStartBlock;
1862 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
1863 T(YAFFS_TRACE_ERROR,
1864 (TSTR("**>> Block %d is not valid" TENDSTR), b));
1868 bi = yaffs_GetBlockInfo(dev, b);
1870 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
1871 (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
1872 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
1874 pagesInUse = (bi->pagesInUse - bi->softDeletions);
1878 dev->currentDirtyChecker = b;
1882 (TSTR("GC Selected block %d with %d free" TENDSTR), dirtiest,
1883 dev->nChunksPerBlock - pagesInUse));
1886 dev->oldestDirtySequence = 0;
1889 nonAggressiveSkip = 4;
1895 static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
1897 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
1901 /* If the block is still healthy erase it and mark as clean.
1902 * If the block has had a data failure, then retire it.
1904 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
1906 if (!bi->needsRetiring) {
1907 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
1909 dev->nErasureFailures++;
1910 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1911 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
1915 if (erasedOk && (yaffs_traceMask & YAFFS_TRACE_ERASE)) {
1917 for (i = 0; i < dev->nChunksPerBlock; i++) {
1918 if (!yaffs_CheckChunkErased
1919 (dev, blockNo * dev->nChunksPerBlock + i)) {
1920 T(YAFFS_TRACE_ERROR,
1922 (">>Block %d erasure supposedly OK, but chunk %d not erased"
1923 TENDSTR), blockNo, i));
1929 /* Clean it up... */
1930 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
1931 dev->nErasedBlocks++;
1933 bi->softDeletions = 0;
1934 bi->hasShrinkHeader = 0;
1935 yaffs_ClearChunkBits(dev, blockNo);
1937 T(YAFFS_TRACE_ERASE,
1938 (TSTR("Erased block %d" TENDSTR), blockNo));
1940 dev->nFreeChunks -= dev->nChunksPerBlock; /* We lost a block of free space */
1942 yaffs_RetireBlock(dev, blockNo);
1943 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1944 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
1948 static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
1952 yaffs_BlockInfo *bi;
1954 if (dev->nErasedBlocks < 1) {
1955 /* Hoosterman we've got a problem.
1956 * Can't get space to gc
1958 T(YAFFS_TRACE_ERROR,
1959 (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
1964 /* Find an empty block. */
1966 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
1967 dev->allocationBlockFinder++;
1968 if (dev->allocationBlockFinder < dev->internalStartBlock
1969 || dev->allocationBlockFinder > dev->internalEndBlock) {
1970 dev->allocationBlockFinder = dev->internalStartBlock;
1973 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
1975 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
1976 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
1977 dev->sequenceNumber++;
1978 bi->sequenceNumber = dev->sequenceNumber;
1979 dev->nErasedBlocks--;
1980 T(YAFFS_TRACE_ALLOCATE,
1981 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
1982 dev->allocationBlockFinder, dev->sequenceNumber,
1983 dev->nErasedBlocks));
1984 return dev->allocationBlockFinder;
1988 T(YAFFS_TRACE_ALWAYS,
1990 ("yaffs tragedy: no more eraased blocks, but there should have been %d"
1991 TENDSTR), dev->nErasedBlocks));
1998 static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
2000 int reservedChunks = (dev->nReservedBlocks * dev->nChunksPerBlock);
2001 return (dev->nFreeChunks > reservedChunks);
2004 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve)
2007 yaffs_BlockInfo *bi;
2009 if (dev->allocationBlock < 0) {
2010 /* Get next block to allocate off */
2011 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2012 dev->allocationPage = 0;
2015 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2016 /* Not enough space to allocate unless we're allowed to use the reserve. */
2020 if (dev->nErasedBlocks < dev->nReservedBlocks
2021 && dev->allocationPage == 0) {
2022 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2025 /* Next page please.... */
2026 if (dev->allocationBlock >= 0) {
2027 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2029 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2030 dev->allocationPage;
2032 yaffs_SetChunkBit(dev, dev->allocationBlock,
2033 dev->allocationPage);
2035 dev->allocationPage++;
2039 /* If the block is full set the state to full */
2040 if (dev->allocationPage >= dev->nChunksPerBlock) {
2041 bi->blockState = YAFFS_BLOCK_STATE_FULL;
2042 dev->allocationBlock = -1;
2048 T(YAFFS_TRACE_ERROR,
2049 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2054 static int yaffs_GetErasedChunks(yaffs_Device * dev)
2058 n = dev->nErasedBlocks * dev->nChunksPerBlock;
2060 if (dev->allocationBlock > 0) {
2061 n += (dev->nChunksPerBlock - dev->allocationPage);
2068 static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
2074 int retVal = YAFFS_OK;
2078 int chunksBefore = yaffs_GetErasedChunks(dev);
2081 yaffs_ExtendedTags tags;
2083 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2085 yaffs_Object *object;
2087 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2089 T(YAFFS_TRACE_TRACING,
2090 (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
2091 bi->pagesInUse, bi->hasShrinkHeader));
2093 /*yaffs_VerifyFreeChunks(dev); */
2095 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
2097 /* Take off the number of soft deleted entries because
2098 * they're going to get really deleted during GC.
2100 dev->nFreeChunks -= bi->softDeletions;
2104 if (!yaffs_StillSomeChunkBits(dev, block)) {
2105 T(YAFFS_TRACE_TRACING,
2107 ("Collecting block %d that has no chunks in use" TENDSTR),
2109 yaffs_BlockBecameDirty(dev, block);
2112 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
2114 for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
2115 chunkInBlock < dev->nChunksPerBlock
2116 && yaffs_StillSomeChunkBits(dev, block);
2117 chunkInBlock++, oldChunk++) {
2118 if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
2120 /* This page is in use and might need to be copied off */
2124 yaffs_InitialiseTags(&tags);
2126 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
2130 yaffs_FindObjectByNumber(dev,
2133 T(YAFFS_TRACE_GC_DETAIL,
2135 ("Collecting page %d, %d %d %d " TENDSTR),
2136 chunkInBlock, tags.objectId, tags.chunkId,
2140 T(YAFFS_TRACE_ERROR,
2142 ("page %d in gc has no object "
2143 TENDSTR), oldChunk));
2146 if (object && object->deleted
2147 && tags.chunkId != 0) {
2148 /* Data chunk in a deleted file, throw it away
2149 * It's a soft deleted data chunk,
2150 * No need to copy this, just forget about it and
2151 * fix up the object.
2154 object->nDataChunks--;
2156 if (object->nDataChunks <= 0) {
2157 /* remeber to clean up the object */
2158 dev->gcCleanupList[cleanups] =
2164 /* Todo object && object->deleted && object->nDataChunks == 0 */
2166 /* Deleted object header with no data chunks.
2167 * Can be discarded and the file deleted.
2169 object->chunkId = 0;
2170 yaffs_FreeTnode(object->myDev,
2173 object->variant.fileVariant.top = NULL;
2174 yaffs_DoGenericObjectDeletion(object);
2176 } else if (object) {
2177 /* It's either a data chunk in a live file or
2178 * an ObjectHeader, so we're interested in it.
2179 * NB Need to keep the ObjectHeaders of deleted files
2180 * until the whole file has been deleted off
2182 tags.serialNumber++;
2186 if (tags.chunkId == 0) {
2187 /* It is an object Id,
2188 * We need to nuke the shrinkheader flags first
2189 * We no longer want the shrinkHeader flag since its work is done
2190 * and if it is left in place it will mess up scanning.
2191 * Also, clear out any shadowing stuff
2194 yaffs_ObjectHeader *oh;
2195 oh = (yaffs_ObjectHeader *)buffer;
2197 oh->shadowsObject = -1;
2198 tags.extraShadows = 0;
2199 tags.extraIsShrinkHeader = 0;
2203 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
2206 retVal = YAFFS_FAIL;
2209 /* Ok, now fix up the Tnodes etc. */
2211 if (tags.chunkId == 0) {
2213 object->chunkId = newChunk;
2214 object->serial = tags.serialNumber;
2216 /* It's a data chunk */
2217 yaffs_PutChunkIntoFile
2225 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
2230 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
2233 /* Do any required cleanups */
2234 for (i = 0; i < cleanups; i++) {
2235 /* Time to delete the file too */
2237 yaffs_FindObjectByNumber(dev,
2238 dev->gcCleanupList[i]);
2240 yaffs_FreeTnode(dev,
2241 object->variant.fileVariant.
2243 object->variant.fileVariant.top = NULL;
2246 ("yaffs: About to finally delete object %d"
2247 TENDSTR), object->objectId));
2248 yaffs_DoGenericObjectDeletion(object);
2255 if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
2258 ("gc did not increase free chunks before %d after %d"
2259 TENDSTR), chunksBefore, chunksAfter));
2267 /* New garbage collector
2268 * If we're very low on erased blocks then we do aggressive garbage collection
2269 * otherwise we do "leasurely" garbage collection.
2270 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2271 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
2273 * The idea is to help clear out space in a more spread-out manner.
2274 * Dunno if it really does anything useful.
2276 static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
2280 int gcOk = YAFFS_OK;
2283 if (dev->isDoingGC) {
2284 /* Bail out so we don't get recursive gc */
2288 /* This loop should pass the first time.
2289 * We'll only see looping here if the erase of the collected block fails.
2294 if (dev->nErasedBlocks < dev->nReservedBlocks) {
2295 /* We need a block soon...*/
2298 /* We're in no hurry */
2302 block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
2305 dev->garbageCollections++;
2307 dev->passiveGarbageCollections++;
2312 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
2313 dev->nErasedBlocks, aggressive));
2315 gcOk = yaffs_GarbageCollectBlock(dev, block);
2318 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
2321 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
2322 TENDSTR), dev->nErasedBlocks, maxTries, block));
2324 } while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
2327 return aggressive ? gcOk : YAFFS_OK;
2330 /*------------------------- TAGS --------------------------------*/
2332 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
2335 return (tags->chunkId == chunkInObject &&
2336 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
2341 /*-------------------- Data file manipulation -----------------*/
2343 static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
2344 yaffs_ExtendedTags * tags)
2346 /*Get the Tnode, then get the level 0 offset chunk offset */
2349 yaffs_ExtendedTags localTags;
2352 yaffs_Device *dev = in->myDev;
2355 /* Passed a NULL, so use our own tags space */
2359 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
2363 tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] <<
2364 dev->chunkGroupBits;
2367 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
2373 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
2374 yaffs_ExtendedTags * tags)
2376 /* Get the Tnode, then get the level 0 offset chunk offset */
2379 yaffs_ExtendedTags localTags;
2381 yaffs_Device *dev = in->myDev;
2385 /* Passed a NULL, so use our own tags space */
2389 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
2394 tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->
2398 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
2401 /* Delete the entry in the filestructure (if found) */
2403 tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = 0;
2406 /*T(("No level 0 found for %d\n", chunkInInode)); */
2410 /* T(("Could not find %d to delete\n",chunkInInode)); */
2415 #ifdef YAFFS_PARANOID
2417 static int yaffs_CheckFileSanity(yaffs_Object * in)
2425 yaffs_Tags localTags;
2426 yaffs_Tags *tags = &localTags;
2430 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
2431 /* T(("Object not a file\n")); */
2435 objId = in->objectId;
2436 fSize = in->variant.fileVariant.fileSize;
2438 (fSize + in->myDev->nBytesPerChunk - 1) / in->myDev->nBytesPerChunk;
2440 for (chunk = 1; chunk <= nChunks; chunk++) {
2441 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
2447 tn->level0[chunk & YAFFS_TNODES_LEVEL0_MASK] << in->
2448 myDev->chunkGroupBits;
2450 if (yaffs_CheckChunkBits
2451 (dev, theChunk / dev->nChunksPerBlock,
2452 theChunk % dev->nChunksPerBlock)) {
2454 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
2458 (tags, in->objectId, chunk, chunkDeleted)) {
2468 /* T(("No level 0 found for %d\n", chunk)); */
2472 return failed ? YAFFS_FAIL : YAFFS_OK;
2477 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
2478 int chunkInNAND, int inScan)
2480 /* NB inScan is zero unless scanning.
2481 * For forward scanning, inScan is > 0;
2482 * for backward scanning inScan is < 0
2486 yaffs_Device *dev = in->myDev;
2488 yaffs_ExtendedTags existingTags;
2489 yaffs_ExtendedTags newTags;
2490 unsigned existingSerial, newSerial;
2492 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
2493 /* Just ignore an attempt at putting a chunk into a non-file during scanning
2494 * If it is not during Scanning then something went wrong!
2497 T(YAFFS_TRACE_ERROR,
2499 ("yaffs tragedy:attempt to put data chunk into a non-file"
2504 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
2508 tn = yaffs_AddOrFindLevel0Tnode(dev, &in->variant.fileVariant,
2514 existingChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK];
2517 /* If we're scanning then we need to test for duplicates
2518 * NB This does not need to be efficient since it should only ever
2519 * happen when the power fails during a write, then only one
2520 * chunk should ever be affected.
2522 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
2523 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
2526 if (existingChunk != 0) {
2527 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
2528 * thus we have to do a FindChunkInFile to get the real chunk id.
2530 * We have a duplicate now we need to decide which one to use:
2532 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
2533 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
2534 * YAFFS1: Get both sets of tags and compare serial numbers.
2538 /* Only do this for forward scanning */
2539 yaffs_ReadChunkWithTagsFromNAND(dev,
2543 /* Do a proper find */
2545 yaffs_FindChunkInFile(in, chunkInInode,
2549 if (existingChunk <= 0) {
2550 /*Hoosterman - how did this happen? */
2552 T(YAFFS_TRACE_ERROR,
2554 ("yaffs tragedy: existing chunk < 0 in scan"
2559 /* NB The deleted flags should be false, otherwise the chunks will
2560 * not be loaded during a scan
2563 newSerial = newTags.serialNumber;
2564 existingSerial = existingTags.serialNumber;
2567 (in->myDev->isYaffs2 ||
2568 existingChunk <= 0 ||
2569 ((existingSerial + 1) & 3) == newSerial)) {
2570 /* Forward scanning.
2572 * Delete the old one and drop through to update the tnode
2574 yaffs_DeleteChunk(dev, existingChunk, 1,
2577 /* Backward scanning or we want to use the existing one
2579 * Delete the new one and return early so that the tnode isn't changed
2581 yaffs_DeleteChunk(dev, chunkInNAND, 1,
2589 if (existingChunk == 0) {
2593 tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] =
2594 (chunkInNAND >> dev->chunkGroupBits);
2599 static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
2602 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
2604 if (chunkInNAND >= 0) {
2605 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
2608 T(YAFFS_TRACE_NANDACCESS,
2609 (TSTR("Chunk %d not found zero instead" TENDSTR),
2611 /* get sane (zero) data if you read a hole */
2612 memset(buffer, 0, in->myDev->nBytesPerChunk);
2618 void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
2622 yaffs_ExtendedTags tags;
2623 yaffs_BlockInfo *bi;
2629 block = chunkId / dev->nChunksPerBlock;
2630 page = chunkId % dev->nChunksPerBlock;
2632 bi = yaffs_GetBlockInfo(dev, block);
2634 T(YAFFS_TRACE_DELETION,
2635 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
2638 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
2640 #ifdef CONFIG_MTD_NAND_VERIFY_WRITE
2642 /* Read data before write, to ensure correct ecc
2643 * if we're using MTD verification under Linux
2645 yaffs_ReadChunkFromNAND(dev, chunkId, NULL, &spare, 0);
2648 yaffs_InitialiseTags(&tags);
2650 tags.chunkDeleted = 1;
2652 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
2653 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
2655 dev->nUnmarkedDeletions++;
2658 /* Pull out of the management area.
2659 * If the whole block became dirty, this will kick off an erasure.
2661 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
2662 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
2663 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
2664 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
2667 yaffs_ClearChunkBit(dev, block, page);
2671 if (bi->pagesInUse == 0 &&
2672 !bi->hasShrinkHeader &&
2673 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
2674 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
2675 yaffs_BlockBecameDirty(dev, block);
2679 /* T(("Bad news deleting chunk %d\n",chunkId)); */
2684 static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
2685 const __u8 * buffer, int nBytes,
2688 /* Find old chunk Need to do this to get serial number
2689 * Write new one and patch into tree.
2690 * Invalidate old tags.
2694 yaffs_ExtendedTags prevTags;
2697 yaffs_ExtendedTags newTags;
2699 yaffs_Device *dev = in->myDev;
2701 yaffs_CheckGarbageCollection(dev);
2703 /* Get the previous chunk at this location in the file if it exists */
2704 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
2706 /* Set up new tags */
2707 yaffs_InitialiseTags(&newTags);
2709 newTags.chunkId = chunkInInode;
2710 newTags.objectId = in->objectId;
2711 newTags.serialNumber =
2712 (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
2713 newTags.byteCount = nBytes;
2716 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
2719 if (newChunkId >= 0) {
2720 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
2722 if (prevChunkId >= 0) {
2723 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
2727 yaffs_CheckFileSanity(in);
2733 /* UpdateObjectHeader updates the header on NAND for an object.
2734 * If name is not NULL, then that new name is used.
2736 int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
2737 int isShrink, int shadows)
2740 yaffs_BlockInfo *bi;
2742 yaffs_Device *dev = in->myDev;
2748 yaffs_ExtendedTags newTags;
2750 __u8 *buffer = NULL;
2751 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
2753 yaffs_ObjectHeader *oh = NULL;
2755 if (!in->fake || force) {
2757 yaffs_CheckGarbageCollection(dev);
2759 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
2760 oh = (yaffs_ObjectHeader *) buffer;
2762 prevChunkId = in->chunkId;
2764 if (prevChunkId >= 0) {
2765 yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
2767 memcpy(oldName, oh->name, sizeof(oh->name));
2770 memset(buffer, 0xFF, dev->nBytesPerChunk);
2772 oh->type = in->variantType;
2773 oh->yst_mode = in->yst_mode;
2774 oh->shadowsObject = shadows;
2776 #ifdef CONFIG_YAFFS_WINCE
2777 oh->win_atime[0] = in->win_atime[0];
2778 oh->win_ctime[0] = in->win_ctime[0];
2779 oh->win_mtime[0] = in->win_mtime[0];
2780 oh->win_atime[1] = in->win_atime[1];
2781 oh->win_ctime[1] = in->win_ctime[1];
2782 oh->win_mtime[1] = in->win_mtime[1];
2784 oh->yst_uid = in->yst_uid;
2785 oh->yst_gid = in->yst_gid;
2786 oh->yst_atime = in->yst_atime;
2787 oh->yst_mtime = in->yst_mtime;
2788 oh->yst_ctime = in->yst_ctime;
2789 oh->yst_rdev = in->yst_rdev;
2792 oh->parentObjectId = in->parent->objectId;
2794 oh->parentObjectId = 0;
2797 if (name && *name) {
2798 memset(oh->name, 0, sizeof(oh->name));
2799 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
2800 } else if (prevChunkId) {
2801 memcpy(oh->name, oldName, sizeof(oh->name));
2803 memset(oh->name, 0, sizeof(oh->name));
2806 oh->isShrink = isShrink;
2808 switch (in->variantType) {
2809 case YAFFS_OBJECT_TYPE_UNKNOWN:
2810 /* Should not happen */
2812 case YAFFS_OBJECT_TYPE_FILE:
2814 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
2815 || oh->parentObjectId ==
2816 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
2817 fileVariant.fileSize;
2819 case YAFFS_OBJECT_TYPE_HARDLINK:
2820 oh->equivalentObjectId =
2821 in->variant.hardLinkVariant.equivalentObjectId;
2823 case YAFFS_OBJECT_TYPE_SPECIAL:
2826 case YAFFS_OBJECT_TYPE_DIRECTORY:
2829 case YAFFS_OBJECT_TYPE_SYMLINK:
2830 yaffs_strncpy(oh->alias,
2831 in->variant.symLinkVariant.alias,
2832 YAFFS_MAX_ALIAS_LENGTH);
2833 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
2838 yaffs_InitialiseTags(&newTags);
2840 newTags.chunkId = 0;
2841 newTags.objectId = in->objectId;
2842 newTags.serialNumber = in->serial;
2844 /* Add extra info for file header */
2846 newTags.extraHeaderInfoAvailable = 1;
2847 newTags.extraParentObjectId = oh->parentObjectId;
2848 newTags.extraFileLength = oh->fileSize;
2849 newTags.extraIsShrinkHeader = oh->isShrink;
2850 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
2851 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
2852 newTags.extraObjectType = in->variantType;
2854 /* Create new chunk in NAND */
2856 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
2857 (prevChunkId >= 0) ? 1 : 0);
2859 if (newChunkId >= 0) {
2861 in->chunkId = newChunkId;
2863 if (prevChunkId >= 0) {
2864 yaffs_DeleteChunk(dev, prevChunkId, 1,
2870 /* If this was a shrink, then mark the block that the chunk lives on */
2872 bi = yaffs_GetBlockInfo(in->myDev,
2873 newChunkId /in->myDev-> nChunksPerBlock);
2874 bi->hasShrinkHeader = 1;
2879 retVal = newChunkId;
2884 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
2889 /*------------------------ Short Operations Cache ----------------------------------------
2890 * In many situations where there is no high level buffering (eg WinCE) a lot of
2891 * reads might be short sequential reads, and a lot of writes may be short
2892 * sequential writes. eg. scanning/writing a jpeg file.
2893 * In these cases, a short read/write cache can provide a huge perfomance benefit
2894 * with dumb-as-a-rock code.
2895 * In Linux, the page cache provides read buffering aand the short op cache provides write
2898 * There are a limited number (~10) of cache chunks per device so that we don't
2899 * need a very intelligent search.
2902 static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
2904 yaffs_Device *dev = obj->myDev;
2905 int lowest = -99; /* Stop compiler whining. */
2907 yaffs_ChunkCache *cache;
2908 int chunkWritten = 0;
2909 int nCaches = obj->myDev->nShortOpCaches;
2915 /* Find the dirty cache for this object with the lowest chunk id. */
2916 for (i = 0; i < nCaches; i++) {
2917 if (dev->srCache[i].object == obj &&
2918 dev->srCache[i].dirty) {
2920 || dev->srCache[i].chunkId <
2922 cache = &dev->srCache[i];
2923 lowest = cache->chunkId;
2928 if (cache && !cache->locked) {
2929 /* Write it out and free it up */
2932 yaffs_WriteChunkDataToObject(cache->object,
2938 cache->object = NULL;
2941 } while (cache && chunkWritten > 0);
2944 /* Hoosterman, disk full while writing cache out. */
2945 T(YAFFS_TRACE_ERROR,
2946 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
2953 /* Grab us a cache chunk for use.
2954 * First look for an empty one.
2955 * Then look for the least recently used non-dirty one.
2956 * Then look for the least recently used dirty one...., flush and look again.
2958 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
2964 if (dev->nShortOpCaches > 0) {
2965 for (i = 0; i < dev->nShortOpCaches; i++) {
2966 if (!dev->srCache[i].object)
2967 return &dev->srCache[i];
2973 usage = 0; /* just to stop the compiler grizzling */
2975 for (i = 0; i < dev->nShortOpCaches; i++) {
2976 if (!dev->srCache[i].dirty &&
2977 ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
2979 usage = dev->srCache[i].lastUse;
2985 return theOne >= 0 ? &dev->srCache[theOne] : NULL;
2992 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
2994 yaffs_ChunkCache *cache;
2995 yaffs_Object *theObj;
3000 if (dev->nShortOpCaches > 0) {
3001 /* Try find a non-dirty one... */
3003 cache = yaffs_GrabChunkCacheWorker(dev);
3006 /* They were all dirty, find the last recently used object and flush
3007 * its cache, then find again.
3008 * NB what's here is not very accurate, we actually flush the object
3009 * the last recently used page.
3012 /* With locking we can't assume we can use entry zero */
3019 for (i = 0; i < dev->nShortOpCaches; i++) {
3020 if (dev->srCache[i].object &&
3021 !dev->srCache[i].locked &&
3022 (dev->srCache[i].lastUse < usage || !cache))
3024 usage = dev->srCache[i].lastUse;
3025 theObj = dev->srCache[i].object;
3026 cache = &dev->srCache[i];
3031 if (!cache || cache->dirty) {
3032 /* Flush and try again */
3033 yaffs_FlushFilesChunkCache(theObj);
3034 cache = yaffs_GrabChunkCacheWorker(dev);
3044 /* Find a cached chunk */
3045 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
3048 yaffs_Device *dev = obj->myDev;
3050 if (dev->nShortOpCaches > 0) {
3051 for (i = 0; i < dev->nShortOpCaches; i++) {
3052 if (dev->srCache[i].object == obj &&
3053 dev->srCache[i].chunkId == chunkId) {
3056 return &dev->srCache[i];
3063 /* Mark the chunk for the least recently used algorithym */
3064 static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
3068 if (dev->nShortOpCaches > 0) {
3069 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
3070 /* Reset the cache usages */
3072 for (i = 1; i < dev->nShortOpCaches; i++) {
3073 dev->srCache[i].lastUse = 0;
3080 cache->lastUse = dev->srLastUse;
3088 /* Invalidate a single cache page.
3089 * Do this when a whole page gets written,
3090 * ie the short cache for this page is no longer valid.
3092 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
3094 if (object->myDev->nShortOpCaches > 0) {
3095 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
3098 cache->object = NULL;
3103 /* Invalidate all the cache pages associated with this object
3104 * Do this whenever ther file is deleted or resized.
3106 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
3109 yaffs_Device *dev = in->myDev;
3111 if (dev->nShortOpCaches > 0) {
3112 /* Invalidate it. */
3113 for (i = 0; i < dev->nShortOpCaches; i++) {
3114 if (dev->srCache[i].object == in) {
3115 dev->srCache[i].object = NULL;
3121 /*--------------------- File read/write ------------------------
3122 * Read and write have very similar structures.
3123 * In general the read/write has three parts to it
3124 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3125 * Some complete chunks
3126 * An incomplete chunk to end off with
3128 * Curve-balls: the first chunk might also be the last chunk.
3131 int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, __u32 offset,
3140 yaffs_ChunkCache *cache;
3147 chunk = offset / dev->nBytesPerChunk + 1; /* The first chunk is 1 */
3148 start = offset % dev->nBytesPerChunk;
3150 /* OK now check for the curveball where the start and end are in
3153 if ((start + n) < dev->nBytesPerChunk) {
3156 nToCopy = dev->nBytesPerChunk - start;
3159 cache = yaffs_FindChunkCache(in, chunk);
3161 /* If the chunk is already in the cache or it is less than a whole chunk
3162 * then use the cache (if there is caching)
3163 * else bypass the cache.
3165 if (cache || nToCopy != dev->nBytesPerChunk) {
3166 if (dev->nShortOpCaches > 0) {
3168 /* If we can't find the data in the cache, then load it up. */
3171 cache = yaffs_GrabChunkCache(in->myDev);
3173 cache->chunkId = chunk;
3176 yaffs_ReadChunkDataFromObject(in, chunk,
3182 yaffs_UseChunkCache(dev, cache, 0);
3186 #ifdef CONFIG_YAFFS_WINCE
3187 yfsd_UnlockYAFFS(TRUE);
3189 memcpy(buffer, &cache->data[start], nToCopy);
3191 #ifdef CONFIG_YAFFS_WINCE
3192 yfsd_LockYAFFS(TRUE);
3196 /* Read into the local buffer then copy..*/
3199 yaffs_GetTempBuffer(dev, __LINE__);
3200 yaffs_ReadChunkDataFromObject(in, chunk,
3202 #ifdef CONFIG_YAFFS_WINCE
3203 yfsd_UnlockYAFFS(TRUE);
3205 memcpy(buffer, &localBuffer[start], nToCopy);
3207 #ifdef CONFIG_YAFFS_WINCE
3208 yfsd_LockYAFFS(TRUE);
3210 yaffs_ReleaseTempBuffer(dev, localBuffer,
3215 #ifdef CONFIG_YAFFS_WINCE
3216 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
3218 /* Under WinCE can't do direct transfer. Need to use a local buffer.
3219 * This is because we otherwise screw up WinCE's memory mapper
3221 yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
3223 #ifdef CONFIG_YAFFS_WINCE
3224 yfsd_UnlockYAFFS(TRUE);
3226 memcpy(buffer, localBuffer, dev->nBytesPerChunk);
3228 #ifdef CONFIG_YAFFS_WINCE
3229 yfsd_LockYAFFS(TRUE);
3230 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
3234 /* A full chunk. Read directly into the supplied buffer. */
3235 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
3249 int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, __u32 offset,
3250 int nBytes, int writeThrough)
3259 int startOfWrite = offset;
3260 int chunkWritten = 0;
3267 while (n > 0 && chunkWritten >= 0) {
3268 chunk = offset / dev->nBytesPerChunk + 1;
3269 start = offset % dev->nBytesPerChunk;
3271 /* OK now check for the curveball where the start and end are in
3275 if ((start + n) < dev->nBytesPerChunk) {
3278 /* Now folks, to calculate how many bytes to write back....
3279 * If we're overwriting and not writing to then end of file then
3280 * we need to write back as much as was there before.
3284 in->variant.fileVariant.fileSize -
3285 ((chunk - 1) * dev->nBytesPerChunk);
3287 if (nBytesRead > dev->nBytesPerChunk) {
3288 nBytesRead = dev->nBytesPerChunk;
3293 (start + n)) ? nBytesRead : (start + n);
3296 nToCopy = dev->nBytesPerChunk - start;
3297 nToWriteBack = dev->nBytesPerChunk;
3300 if (nToCopy != dev->nBytesPerChunk) {
3301 /* An incomplete start or end chunk (or maybe both start and end chunk) */
3302 if (dev->nShortOpCaches > 0) {
3303 yaffs_ChunkCache *cache;
3304 /* If we can't find the data in the cache, then load the cache */
3305 cache = yaffs_FindChunkCache(in, chunk);
3307 && yaffs_CheckSpaceForAllocation(in->
3309 cache = yaffs_GrabChunkCache(in->myDev);
3311 cache->chunkId = chunk;
3314 yaffs_ReadChunkDataFromObject(in, chunk,
3320 yaffs_UseChunkCache(dev, cache, 1);
3322 #ifdef CONFIG_YAFFS_WINCE
3323 yfsd_UnlockYAFFS(TRUE);
3326 memcpy(&cache->data[start], buffer,
3329 #ifdef CONFIG_YAFFS_WINCE
3330 yfsd_LockYAFFS(TRUE);
3333 cache->nBytes = nToWriteBack;
3337 yaffs_WriteChunkDataToObject
3340 cache->data, cache->nBytes,
3346 chunkWritten = -1; /* fail the write */
3349 /* An incomplete start or end chunk (or maybe both start and end chunk)
3350 * Read into the local buffer then copy, then copy over and write back.
3354 yaffs_GetTempBuffer(dev, __LINE__);
3356 yaffs_ReadChunkDataFromObject(in, chunk,
3359 #ifdef CONFIG_YAFFS_WINCE
3360 yfsd_UnlockYAFFS(TRUE);
3363 memcpy(&localBuffer[start], buffer, nToCopy);
3365 #ifdef CONFIG_YAFFS_WINCE
3366 yfsd_LockYAFFS(TRUE);
3369 yaffs_WriteChunkDataToObject(in, chunk,
3374 yaffs_ReleaseTempBuffer(dev, localBuffer,
3381 #ifdef CONFIG_YAFFS_WINCE
3382 /* Under WinCE can't do direct transfer. Need to use a local buffer.
3383 * This is because we otherwise screw up WinCE's memory mapper
3385 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
3386 #ifdef CONFIG_YAFFS_WINCE
3387 yfsd_UnlockYAFFS(TRUE);
3389 memcpy(localBuffer, buffer, dev->nBytesPerChunk);
3390 #ifdef CONFIG_YAFFS_WINCE
3391 yfsd_LockYAFFS(TRUE);
3394 yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
3395 dev->nBytesPerChunk,
3397 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
3399 /* A full chunk. Write directly from the supplied buffer. */
3401 yaffs_WriteChunkDataToObject(in, chunk, buffer,
3402 dev->nBytesPerChunk,
3405 /* Since we've overwritten the cached data, we better invalidate it. */
3406 yaffs_InvalidateChunkCache(in, chunk);
3409 if (chunkWritten >= 0) {
3418 /* Update file object */
3420 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
3421 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
3430 /* ---------------------- File resizing stuff ------------------ */
3432 static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
3435 yaffs_Device *dev = in->myDev;
3436 int oldFileSize = in->variant.fileVariant.fileSize;
3438 int lastDel = 1 + (oldFileSize - 1) / dev->nBytesPerChunk;
3440 int startDel = 1 + (newSize + dev->nBytesPerChunk - 1) /
3441 dev->nBytesPerChunk;
3445 /* Delete backwards so that we don't end up with holes if
3446 * power is lost part-way through the operation.
3448 for (i = lastDel; i >= startDel; i--) {
3449 /* NB this could be optimised somewhat,
3450 * eg. could retrieve the tags and write them without
3451 * using yaffs_DeleteChunk
3454 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
3457 (dev->internalStartBlock * dev->nChunksPerBlock)
3459 ((dev->internalEndBlock +
3460 1) * dev->nChunksPerBlock)) {
3461 T(YAFFS_TRACE_ALWAYS,
3462 (TSTR("Found daft chunkId %d for %d" TENDSTR),
3466 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
3473 int yaffs_ResizeFile(yaffs_Object * in, int newSize)
3476 int oldFileSize = in->variant.fileVariant.fileSize;
3477 int sizeOfPartialChunk;
3478 yaffs_Device *dev = in->myDev;
3480 sizeOfPartialChunk = newSize % dev->nBytesPerChunk;
3482 yaffs_FlushFilesChunkCache(in);
3483 yaffs_InvalidateWholeChunkCache(in);
3485 yaffs_CheckGarbageCollection(dev);
3487 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3488 return yaffs_GetFileSize(in);
3491 if (newSize == oldFileSize) {
3495 if (newSize < oldFileSize) {
3497 yaffs_PruneResizedChunks(in, newSize);
3499 if (sizeOfPartialChunk != 0) {
3500 int lastChunk = 1 + newSize / dev->nBytesPerChunk;
3501 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
3503 /* Got to read and rewrite the last chunk with its new size and zero pad */
3504 yaffs_ReadChunkDataFromObject(in, lastChunk,
3507 memset(localBuffer + sizeOfPartialChunk, 0,
3508 dev->nBytesPerChunk - sizeOfPartialChunk);
3510 yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
3511 sizeOfPartialChunk, 1);
3513 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
3516 in->variant.fileVariant.fileSize = newSize;
3518 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
3520 /* Write a new object header.
3521 * show we've shrunk the file, if need be
3522 * Do this only if the file is not in the deleted directories.
3524 if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
3525 in->parent->objectId != YAFFS_OBJECTID_DELETED) {
3526 yaffs_UpdateObjectHeader(in, NULL, 0,
3527 (newSize < oldFileSize) ? 1 : 0, 0);
3533 loff_t yaffs_GetFileSize(yaffs_Object * obj)
3535 obj = yaffs_GetEquivalentObject(obj);
3537 switch (obj->variantType) {
3538 case YAFFS_OBJECT_TYPE_FILE:
3539 return obj->variant.fileVariant.fileSize;
3540 case YAFFS_OBJECT_TYPE_SYMLINK:
3541 return yaffs_strlen(obj->variant.symLinkVariant.alias);
3549 int yaffs_FlushFile(yaffs_Object * in, int updateTime)
3553 yaffs_FlushFilesChunkCache(in);
3555 #ifdef CONFIG_YAFFS_WINCE
3556 yfsd_WinFileTimeNow(in->win_mtime);
3559 in->yst_mtime = Y_CURRENT_TIME;
3565 (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
3566 0) ? YAFFS_OK : YAFFS_FAIL;
3575 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
3578 /* First off, invalidate the file's data in the cache, without flushing. */
3579 yaffs_InvalidateWholeChunkCache(in);
3581 if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
3582 /* Move to the unlinked directory so we have a record that it was deleted. */
3583 yaffs_ChangeObjectName(in, in->myDev->deletedDir, NULL, 0, 0);
3587 yaffs_RemoveObjectFromDirectory(in);
3588 yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
3591 yaffs_FreeObject(in);
3596 /* yaffs_DeleteFile deletes the whole file data
3597 * and the inode associated with the file.
3598 * It does not delete the links associated with the file.
3600 static int yaffs_UnlinkFile(yaffs_Object * in)
3604 int immediateDeletion = 0;
3609 immediateDeletion = 1;
3613 if (in->inUse <= 0) {
3614 immediateDeletion = 1;
3618 if (immediateDeletion) {
3620 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
3622 T(YAFFS_TRACE_TRACING,
3623 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
3626 in->myDev->nDeletedFiles++;
3627 if (0 && in->myDev->isYaffs2) {
3628 yaffs_ResizeFile(in, 0);
3630 yaffs_SoftDeleteFile(in);
3633 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
3641 int yaffs_DeleteFile(yaffs_Object * in)
3643 int retVal = YAFFS_OK;
3645 if (in->nDataChunks > 0) {
3646 /* Use soft deletion if there is data in the file */
3647 if (!in->unlinked) {
3648 retVal = yaffs_UnlinkFile(in);
3650 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
3652 in->myDev->nDeletedFiles++;
3653 yaffs_SoftDeleteFile(in);
3655 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
3657 /* The file has no data chunks so we toss it immediately */
3658 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
3659 in->variant.fileVariant.top = NULL;
3660 yaffs_DoGenericObjectDeletion(in);
3666 static int yaffs_DeleteDirectory(yaffs_Object * in)
3668 /* First check that the directory is empty. */
3669 if (list_empty(&in->variant.directoryVariant.children)) {
3670 return yaffs_DoGenericObjectDeletion(in);
3677 static int yaffs_DeleteSymLink(yaffs_Object * in)
3679 YFREE(in->variant.symLinkVariant.alias);
3681 return yaffs_DoGenericObjectDeletion(in);
3684 static int yaffs_DeleteHardLink(yaffs_Object * in)
3686 /* remove this hardlink from the list assocaited with the equivalent
3689 list_del(&in->hardLinks);
3690 return yaffs_DoGenericObjectDeletion(in);
3693 static void yaffs_DestroyObject(yaffs_Object * obj)
3695 switch (obj->variantType) {
3696 case YAFFS_OBJECT_TYPE_FILE:
3697 yaffs_DeleteFile(obj);
3699 case YAFFS_OBJECT_TYPE_DIRECTORY:
3700 yaffs_DeleteDirectory(obj);
3702 case YAFFS_OBJECT_TYPE_SYMLINK:
3703 yaffs_DeleteSymLink(obj);
3705 case YAFFS_OBJECT_TYPE_HARDLINK:
3706 yaffs_DeleteHardLink(obj);
3708 case YAFFS_OBJECT_TYPE_SPECIAL:
3709 yaffs_DoGenericObjectDeletion(obj);
3711 case YAFFS_OBJECT_TYPE_UNKNOWN:
3712 break; /* should not happen. */
3716 static int yaffs_UnlinkWorker(yaffs_Object * obj)
3719 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
3720 return yaffs_DeleteHardLink(obj);
3721 } else if (!list_empty(&obj->hardLinks)) {
3722 /* Curve ball: We're unlinking an object that has a hardlink.
3724 * This problem arises because we are not strictly following
3725 * The Linux link/inode model.
3727 * We can't really delete the object.
3728 * Instead, we do the following:
3729 * - Select a hardlink.
3730 * - Unhook it from the hard links
3731 * - Unhook it from its parent directory (so that the rename can work)
3732 * - Rename the object to the hardlink's name.
3733 * - Delete the hardlink
3738 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
3740 hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
3742 list_del_init(&hl->hardLinks);
3743 list_del_init(&hl->siblings);
3745 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
3747 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
3749 if (retVal == YAFFS_OK) {
3750 retVal = yaffs_DoGenericObjectDeletion(hl);
3755 switch (obj->variantType) {
3756 case YAFFS_OBJECT_TYPE_FILE:
3757 return yaffs_UnlinkFile(obj);
3759 case YAFFS_OBJECT_TYPE_DIRECTORY:
3760 return yaffs_DeleteDirectory(obj);
3762 case YAFFS_OBJECT_TYPE_SYMLINK:
3763 return yaffs_DeleteSymLink(obj);
3765 case YAFFS_OBJECT_TYPE_SPECIAL:
3766 return yaffs_DoGenericObjectDeletion(obj);
3768 case YAFFS_OBJECT_TYPE_HARDLINK:
3769 case YAFFS_OBJECT_TYPE_UNKNOWN:
3777 static int yaffs_UnlinkObject( yaffs_Object *obj)
3780 if (obj && obj->unlinkAllowed) {
3781 return yaffs_UnlinkWorker(obj);
3787 int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
3791 obj = yaffs_FindObjectByName(dir, name);
3792 return yaffs_UnlinkObject(obj);
3795 /*----------------------- Initialisation Scanning ---------------------- */
3797 static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
3798 int backwardScanning)
3802 if (!backwardScanning) {
3803 /* Handle YAFFS1 forward scanning case
3804 * For YAFFS1 we always do the deletion
3808 /* Handle YAFFS2 case (backward scanning)
3809 * If the shadowed object exists then ignore.
3811 if (yaffs_FindObjectByNumber(dev, objId)) {
3816 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
3817 * We put it in unlinked dir to be cleaned up after the scanning
3820 yaffs_FindOrCreateObjectByNumber(dev, objId,
3821 YAFFS_OBJECT_TYPE_FILE);
3822 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
3823 obj->variant.fileVariant.shrinkSize = 0;
3824 obj->valid = 1; /* So that we don't read any other info for this file */
3833 static int yaffs_Scan(yaffs_Device * dev)
3835 yaffs_ExtendedTags tags;
3840 int nBlocksToScan = 0;
3845 yaffs_BlockState state;
3846 yaffs_Object *hardList = NULL;
3848 yaffs_BlockInfo *bi;
3850 yaffs_ObjectHeader *oh;
3852 yaffs_Object *parent;
3853 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
3857 yaffs_BlockIndex *blockIndex = NULL;
3860 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
3861 dev->internalStartBlock, dev->internalEndBlock));
3863 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
3865 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
3867 if (dev->isYaffs2) {
3868 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
3871 /* Scan all the blocks to determine their state */
3872 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
3873 bi = yaffs_GetBlockInfo(dev, blk);
3874 yaffs_ClearChunkBits(dev, blk);
3876 bi->softDeletions = 0;
3878 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
3880 bi->blockState = state;
3881 bi->sequenceNumber = sequenceNumber;
3883 T(YAFFS_TRACE_SCAN_DEBUG,
3884 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
3885 state, sequenceNumber));
3887 if (state == YAFFS_BLOCK_STATE_DEAD) {
3888 T(YAFFS_TRACE_BAD_BLOCKS,
3889 (TSTR("block %d is bad" TENDSTR), blk));
3890 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
3891 T(YAFFS_TRACE_SCAN_DEBUG,
3892 (TSTR("Block empty " TENDSTR)));
3893 dev->nErasedBlocks++;
3894 dev->nFreeChunks += dev->nChunksPerBlock;
3895 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3897 /* Determine the highest sequence number */
3898 if (dev->isYaffs2 &&
3899 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
3900 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
3902 blockIndex[nBlocksToScan].seq = sequenceNumber;
3903 blockIndex[nBlocksToScan].block = blk;
3907 if (sequenceNumber >= dev->sequenceNumber) {
3908 dev->sequenceNumber = sequenceNumber;
3910 } else if (dev->isYaffs2) {
3911 /* TODO: Nasty sequence number! */
3914 ("Block scanning block %d has bad sequence number %d"
3915 TENDSTR), blk, sequenceNumber));
3922 * Dungy old bubble sort for now...
3924 if (dev->isYaffs2) {
3925 yaffs_BlockIndex temp;
3929 for (i = 0; i < nBlocksToScan; i++)
3930 for (j = i + 1; j < nBlocksToScan; j++)
3931 if (blockIndex[i].seq > blockIndex[j].seq) {
3932 temp = blockIndex[j];
3933 blockIndex[j] = blockIndex[i];
3934 blockIndex[i] = temp;
3938 /* Now scan the blocks looking at the data. */
3939 if (dev->isYaffs2) {
3941 endIterator = nBlocksToScan - 1;
3942 T(YAFFS_TRACE_SCAN_DEBUG,
3943 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
3945 startIterator = dev->internalStartBlock;
3946 endIterator = dev->internalEndBlock;
3949 /* For each block.... */
3950 for (blockIterator = startIterator; blockIterator <= endIterator;
3953 if (dev->isYaffs2) {
3954 /* get the block to scan in the correct order */
3955 blk = blockIndex[blockIterator].block;
3957 blk = blockIterator;
3960 bi = yaffs_GetBlockInfo(dev, blk);
3961 state = bi->blockState;
3965 /* For each chunk in each block that needs scanning....*/
3966 for (c = 0; c < dev->nChunksPerBlock &&
3967 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
3968 /* Read the tags and decide what to do */
3969 chunk = blk * dev->nChunksPerBlock + c;
3971 yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
3974 /* Let's have a good look at this chunk... */
3976 if (!dev->isYaffs2 && tags.chunkDeleted) {
3982 /*T((" %d %d deleted\n",blk,c)); */
3983 } else if (!tags.chunkUsed) {
3984 /* An unassigned chunk in the block
3985 * This means that either the block is empty or
3986 * this is the one being allocated from
3990 /* We're looking at the first chunk in the block so the block is unused */
3991 state = YAFFS_BLOCK_STATE_EMPTY;
3992 dev->nErasedBlocks++;
3994 /* this is the block being allocated from */
3997 (" Allocating from %d %d" TENDSTR),
3999 state = YAFFS_BLOCK_STATE_ALLOCATING;
4000 dev->allocationBlock = blk;
4001 dev->allocationPage = c;
4002 dev->allocationBlockFinder = blk;
4003 /* Set it to here to encourage the allocator to go forth from here. */
4005 /* Yaffs2 sanity check:
4006 * This should be the one with the highest sequence number
4009 && (dev->sequenceNumber !=
4010 bi->sequenceNumber)) {
4011 T(YAFFS_TRACE_ALWAYS,
4013 ("yaffs: Allocation block %d was not highest sequence id:"
4014 " block seq = %d, dev seq = %d"
4015 TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
4019 dev->nFreeChunks += (dev->nChunksPerBlock - c);
4020 } else if (tags.chunkId > 0) {
4021 /* chunkId > 0 so it is a data chunk... */
4022 unsigned int endpos;
4024 yaffs_SetChunkBit(dev, blk, c);
4027 in = yaffs_FindOrCreateObjectByNumber(dev,
4030 YAFFS_OBJECT_TYPE_FILE);
4031 /* PutChunkIntoFile checks for a clash (two data chunks with
4032 * the same chunkId).
4034 yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,
4037 (tags.chunkId - 1) * dev->nBytesPerChunk +
4039 if (in->variantType == YAFFS_OBJECT_TYPE_FILE
4040 && in->variant.fileVariant.scannedFileSize <
4042 in->variant.fileVariant.
4043 scannedFileSize = endpos;
4044 if (!dev->useHeaderFileSize) {
4045 in->variant.fileVariant.
4047 in->variant.fileVariant.
4052 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
4054 /* chunkId == 0, so it is an ObjectHeader.
4055 * Thus, we read in the object header and make the object
4057 yaffs_SetChunkBit(dev, blk, c);
4060 yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
4064 oh = (yaffs_ObjectHeader *) chunkData;
4066 in = yaffs_FindObjectByNumber(dev,
4068 if (in && in->variantType != oh->type) {
4069 /* This should not happen, but somehow
4070 * Wev'e ended up with an objectId that has been reused but not yet
4071 * deleted, and worse still it has changed type. Delete the old object.
4074 yaffs_DestroyObject(in);
4079 in = yaffs_FindOrCreateObjectByNumber(dev,
4084 if (oh->shadowsObject > 0) {
4085 yaffs_HandleShadowedObject(dev,
4092 /* We have already filled this one. We have a duplicate and need to resolve it. */
4094 unsigned existingSerial = in->serial;
4095 unsigned newSerial = tags.serialNumber;
4097 if (dev->isYaffs2 ||
4098 ((existingSerial + 1) & 3) ==
4100 /* Use new one - destroy the exisiting one */
4101 yaffs_DeleteChunk(dev,
4106 /* Use existing - destroy this one. */
4107 yaffs_DeleteChunk(dev, chunk, 1,
4113 (tags.objectId == YAFFS_OBJECTID_ROOT ||
4114 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
4115 /* We only load some info, don't fiddle with directory structure */
4117 in->variantType = oh->type;
4119 in->yst_mode = oh->yst_mode;
4120 #ifdef CONFIG_YAFFS_WINCE
4121 in->win_atime[0] = oh->win_atime[0];
4122 in->win_ctime[0] = oh->win_ctime[0];
4123 in->win_mtime[0] = oh->win_mtime[0];
4124 in->win_atime[1] = oh->win_atime[1];
4125 in->win_ctime[1] = oh->win_ctime[1];
4126 in->win_mtime[1] = oh->win_mtime[1];
4128 in->yst_uid = oh->yst_uid;
4129 in->yst_gid = oh->yst_gid;
4130 in->yst_atime = oh->yst_atime;
4131 in->yst_mtime = oh->yst_mtime;
4132 in->yst_ctime = oh->yst_ctime;
4133 in->yst_rdev = oh->yst_rdev;
4135 in->chunkId = chunk;
4137 } else if (!in->valid) {
4138 /* we need to load this info */
4141 in->variantType = oh->type;
4143 in->yst_mode = oh->yst_mode;
4144 #ifdef CONFIG_YAFFS_WINCE
4145 in->win_atime[0] = oh->win_atime[0];
4146 in->win_ctime[0] = oh->win_ctime[0];
4147 in->win_mtime[0] = oh->win_mtime[0];
4148 in->win_atime[1] = oh->win_atime[1];
4149 in->win_ctime[1] = oh->win_ctime[1];
4150 in->win_mtime[1] = oh->win_mtime[1];
4152 in->yst_uid = oh->yst_uid;
4153 in->yst_gid = oh->yst_gid;
4154 in->yst_atime = oh->yst_atime;
4155 in->yst_mtime = oh->yst_mtime;
4156 in->yst_ctime = oh->yst_ctime;
4157 in->yst_rdev = oh->yst_rdev;
4159 in->chunkId = chunk;
4161 yaffs_SetObjectName(in, oh->name);
4164 /* directory stuff...
4169 yaffs_FindOrCreateObjectByNumber
4170 (dev, oh->parentObjectId,
4171 YAFFS_OBJECT_TYPE_DIRECTORY);
4172 if (parent->variantType ==
4173 YAFFS_OBJECT_TYPE_UNKNOWN) {
4174 /* Set up as a directory */
4175 parent->variantType =
4176 YAFFS_OBJECT_TYPE_DIRECTORY;
4177 INIT_LIST_HEAD(&parent->variant.
4180 } else if (parent->variantType !=
4181 YAFFS_OBJECT_TYPE_DIRECTORY)
4183 /* Hoosterman, another problem....
4184 * We're trying to use a non-directory as a directory
4187 T(YAFFS_TRACE_ERROR,
4189 ("yaffs tragedy: attempting to use non-directory as"
4190 " a directory in scan. Put in lost+found."
4192 parent = dev->lostNFoundDir;
4195 yaffs_AddObjectToDirectory(parent, in);
4197 if (0 && (parent == dev->deletedDir ||
4198 parent == dev->unlinkedDir)) {
4199 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
4200 dev->nDeletedFiles++;
4202 /* Note re hardlinks.
4203 * Since we might scan a hardlink before its equivalent object is scanned
4204 * we put them all in a list.
4205 * After scanning is complete, we should have all the objects, so we run through this
4206 * list and fix up all the chains.
4209 switch (in->variantType) {
4210 case YAFFS_OBJECT_TYPE_UNKNOWN:
4211 /* Todo got a problem */
4213 case YAFFS_OBJECT_TYPE_FILE:
4216 /* Prune back the shrunken chunks */
4217 yaffs_PruneResizedChunks
4219 /* Mark the block as having a shrinkHeader */
4220 bi->hasShrinkHeader = 1;
4223 if (dev->useHeaderFileSize)
4225 in->variant.fileVariant.
4230 case YAFFS_OBJECT_TYPE_HARDLINK:
4231 in->variant.hardLinkVariant.
4232 equivalentObjectId =
4233 oh->equivalentObjectId;
4234 in->hardLinks.next =
4235 (struct list_head *)
4239 case YAFFS_OBJECT_TYPE_DIRECTORY:
4242 case YAFFS_OBJECT_TYPE_SPECIAL:
4245 case YAFFS_OBJECT_TYPE_SYMLINK:
4246 in->variant.symLinkVariant.
4248 yaffs_CloneString(oh->alias);
4252 if (parent == dev->deletedDir) {
4253 yaffs_DestroyObject(in);
4254 bi->hasShrinkHeader = 1;
4260 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4261 /* If we got this far while scanning, then the block is fully allocated.*/
4262 state = YAFFS_BLOCK_STATE_FULL;
4265 bi->blockState = state;
4267 /* Now let's see if it was dirty */
4268 if (bi->pagesInUse == 0 &&
4269 !bi->hasShrinkHeader &&
4270 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
4271 yaffs_BlockBecameDirty(dev, blk);
4280 /* Ok, we've done all the scanning.
4281 * Fix up the hard link chains.
4282 * We should now have scanned all the objects, now it's time to add these
4287 hardList = (yaffs_Object *) (hardList->hardLinks.next);
4289 in = yaffs_FindObjectByNumber(dev,
4290 hl->variant.hardLinkVariant.
4291 equivalentObjectId);
4294 /* Add the hardlink pointers */
4295 hl->variant.hardLinkVariant.equivalentObject = in;
4296 list_add(&hl->hardLinks, &in->hardLinks);
4298 /* Todo Need to report/handle this better.
4299 * Got a problem... hardlink to a non-existant object
4301 hl->variant.hardLinkVariant.equivalentObject = NULL;
4302 INIT_LIST_HEAD(&hl->hardLinks);
4308 /* Handle the unlinked files. Since they were left in an unlinked state we should
4312 struct list_head *i;
4313 struct list_head *n;
4316 /* Soft delete all the unlinked files */
4317 list_for_each_safe(i, n,
4318 &dev->unlinkedDir->variant.directoryVariant.
4321 l = list_entry(i, yaffs_Object, siblings);
4322 yaffs_DestroyObject(l);
4327 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
4329 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
4334 static int yaffs_ScanBackwards(yaffs_Device * dev)
4336 yaffs_ExtendedTags tags;
4341 int nBlocksToScan = 0;
4346 yaffs_BlockState state;
4347 yaffs_Object *hardList = NULL;
4349 yaffs_BlockInfo *bi;
4351 yaffs_ObjectHeader *oh;
4353 yaffs_Object *parent;
4354 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
4358 yaffs_BlockIndex *blockIndex = NULL;
4360 if (!dev->isYaffs2) {
4362 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
4368 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
4369 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
4371 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
4373 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
4375 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
4377 /* Scan all the blocks to determine their state */
4378 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
4379 bi = yaffs_GetBlockInfo(dev, blk);
4380 yaffs_ClearChunkBits(dev, blk);
4382 bi->softDeletions = 0;
4384 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
4386 bi->blockState = state;
4387 bi->sequenceNumber = sequenceNumber;
4389 T(YAFFS_TRACE_SCAN_DEBUG,
4390 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
4391 state, sequenceNumber));
4393 if (state == YAFFS_BLOCK_STATE_DEAD) {
4394 T(YAFFS_TRACE_BAD_BLOCKS,
4395 (TSTR("block %d is bad" TENDSTR), blk));
4396 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
4397 T(YAFFS_TRACE_SCAN_DEBUG,
4398 (TSTR("Block empty " TENDSTR)));
4399 dev->nErasedBlocks++;
4400 dev->nFreeChunks += dev->nChunksPerBlock;
4401 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4403 /* Determine the highest sequence number */
4404 if (dev->isYaffs2 &&
4405 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
4406 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
4408 blockIndex[nBlocksToScan].seq = sequenceNumber;
4409 blockIndex[nBlocksToScan].block = blk;
4413 if (sequenceNumber >= dev->sequenceNumber) {
4414 dev->sequenceNumber = sequenceNumber;
4416 } else if (dev->isYaffs2) {
4417 /* TODO: Nasty sequence number! */
4420 ("Block scanning block %d has bad sequence number %d"
4421 TENDSTR), blk, sequenceNumber));
4429 * Dungy old bubble sort for now...
4432 yaffs_BlockIndex temp;
4436 for (i = 0; i < nBlocksToScan; i++)
4437 for (j = i + 1; j < nBlocksToScan; j++)
4438 if (blockIndex[i].seq > blockIndex[j].seq) {
4439 temp = blockIndex[j];
4440 blockIndex[j] = blockIndex[i];
4441 blockIndex[i] = temp;
4445 /* Now scan the blocks looking at the data. */
4447 endIterator = nBlocksToScan - 1;
4448 T(YAFFS_TRACE_SCAN_DEBUG,
4449 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
4451 /* For each block.... backwards */
4452 for (blockIterator = endIterator; blockIterator >= startIterator;
4455 /* get the block to scan in the correct order */
4456 blk = blockIndex[blockIterator].block;
4458 bi = yaffs_GetBlockInfo(dev, blk);
4459 state = bi->blockState;
4463 /* For each chunk in each block that needs scanning.... */
4464 for (c = dev->nChunksPerBlock - 1; c >= 0 &&
4465 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
4466 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
4467 /* Scan backwards...
4468 * Read the tags and decide what to do
4470 chunk = blk * dev->nChunksPerBlock + c;
4472 yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
4475 /* Let's have a good look at this chunk... */
4477 if (!tags.chunkUsed) {
4478 // An unassigned chunk in the block
4479 // This means that either the block is empty or
4480 // this is the one being allocated from
4483 /* We're looking at the first chunk in the block so the block is unused */
4484 state = YAFFS_BLOCK_STATE_EMPTY;
4485 dev->nErasedBlocks++;
4487 /* this is the block being allocated from */
4489 YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4492 (" Allocating from %d %d"
4495 state = YAFFS_BLOCK_STATE_ALLOCATING;
4496 dev->allocationBlock = blk;
4497 dev->allocationPage = c;
4498 dev->allocationBlockFinder = blk;
4499 /* Set it to here to encourage the allocator to
4500 * go forth from here.
4503 /* Yaffs2 sanity check:
4504 * This should be the one with the highest sequence number
4507 && (dev->sequenceNumber !=
4508 bi->sequenceNumber)) {
4509 T(YAFFS_TRACE_ALWAYS,
4511 ("yaffs: Allocation block %d was not highest sequence "
4512 "id: block seq = %d, dev seq = %d"
4515 dev->sequenceNumber));
4520 } else if (tags.chunkId > 0) {
4521 /* chunkId > 0 so it is a data chunk... */
4522 unsigned int endpos;
4525 (tags.chunkId - 1) * dev->nBytesPerChunk;
4527 yaffs_SetChunkBit(dev, blk, c);
4530 in = yaffs_FindOrCreateObjectByNumber(dev,
4533 YAFFS_OBJECT_TYPE_FILE);
4534 if (in->variantType == YAFFS_OBJECT_TYPE_FILE
4536 in->variant.fileVariant.shrinkSize) {
4537 /* This has not been invalidated by a resize */
4538 yaffs_PutChunkIntoFile(in, tags.chunkId,
4541 /* File size is calculated by looking at the data chunks if we have not
4542 * seen an object header yet. Stop this practice once we find an object header.
4546 1) * dev->nBytesPerChunk +
4549 if (!in->valid && /* have not got an object header yet */
4550 in->variant.fileVariant.
4551 scannedFileSize < endpos) {
4552 in->variant.fileVariant.
4553 scannedFileSize = endpos;
4554 in->variant.fileVariant.
4556 in->variant.fileVariant.
4561 /* This chunk has been invalidated by a resize, so delete */
4562 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
4566 /* chunkId == 0, so it is an ObjectHeader.
4567 * Thus, we read in the object header and make the object
4569 yaffs_SetChunkBit(dev, blk, c);
4575 if (tags.extraHeaderInfoAvailable) {
4576 in = yaffs_FindOrCreateObjectByNumber
4577 (dev, tags.objectId,
4578 tags.extraObjectType);
4581 if (!in || !in->valid) {
4583 /* If we don't have valid info then we need to read the chunk
4584 * TODO In future we can probably defer reading the chunk and
4585 * living with invalid data until needed.
4588 yaffs_ReadChunkWithTagsFromNAND(dev,
4593 oh = (yaffs_ObjectHeader *) chunkData;
4596 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
4601 /* TODO Hoosterman we have a problem! */
4602 T(YAFFS_TRACE_ERROR,
4604 ("yaffs tragedy: Could not make object for object %d "
4605 "at chunk %d during scan"
4606 TENDSTR), tags.objectId, chunk));
4611 /* We have already filled this one.
4612 * We have a duplicate that will be discarded, but
4613 * we first have to suck out resize info if it is a file.
4616 if ((in->variantType ==
4617 YAFFS_OBJECT_TYPE_FILE) && ((oh
4622 YAFFS_OBJECT_TYPE_FILE)
4625 extraHeaderInfoAvailable
4630 YAFFS_OBJECT_TYPE_FILE))
4633 (oh) ? oh->fileSize : tags.
4635 __u32 parentObjectId =
4637 parentObjectId : tags.
4638 extraParentObjectId;
4640 (oh) ? oh->isShrink : tags.
4641 extraIsShrinkHeader;
4643 /* If it is deleted (unlinked at start also means deleted)
4644 * we treat the file size as being zeroed at this point.
4646 if (parentObjectId ==
4647 YAFFS_OBJECTID_DELETED
4648 || parentObjectId ==
4649 YAFFS_OBJECTID_UNLINKED) {
4655 in->variant.fileVariant.
4656 shrinkSize > thisSize) {
4657 in->variant.fileVariant.
4663 bi->hasShrinkHeader = 1;
4667 /* Use existing - destroy this one. */
4668 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
4673 (tags.objectId == YAFFS_OBJECTID_ROOT ||
4675 YAFFS_OBJECTID_LOSTNFOUND)) {
4676 /* We only load some info, don't fiddle with directory structure */
4678 in->variantType = oh->type;
4680 in->yst_mode = oh->yst_mode;
4681 #ifdef CONFIG_YAFFS_WINCE
4682 in->win_atime[0] = oh->win_atime[0];
4683 in->win_ctime[0] = oh->win_ctime[0];
4684 in->win_mtime[0] = oh->win_mtime[0];
4685 in->win_atime[1] = oh->win_atime[1];
4686 in->win_ctime[1] = oh->win_ctime[1];
4687 in->win_mtime[1] = oh->win_mtime[1];
4689 in->yst_uid = oh->yst_uid;
4690 in->yst_gid = oh->yst_gid;
4691 in->yst_atime = oh->yst_atime;
4692 in->yst_mtime = oh->yst_mtime;
4693 in->yst_ctime = oh->yst_ctime;
4694 in->yst_rdev = oh->yst_rdev;
4696 in->chunkId = chunk;
4698 } else if (!in->valid) {
4699 /* we need to load this info */
4702 in->variantType = oh->type;
4704 in->yst_mode = oh->yst_mode;
4705 #ifdef CONFIG_YAFFS_WINCE
4706 in->win_atime[0] = oh->win_atime[0];
4707 in->win_ctime[0] = oh->win_ctime[0];
4708 in->win_mtime[0] = oh->win_mtime[0];
4709 in->win_atime[1] = oh->win_atime[1];
4710 in->win_ctime[1] = oh->win_ctime[1];
4711 in->win_mtime[1] = oh->win_mtime[1];
4713 in->yst_uid = oh->yst_uid;
4714 in->yst_gid = oh->yst_gid;
4715 in->yst_atime = oh->yst_atime;
4716 in->yst_mtime = oh->yst_mtime;
4717 in->yst_ctime = oh->yst_ctime;
4718 in->yst_rdev = oh->yst_rdev;
4720 in->chunkId = chunk;
4722 if (oh->shadowsObject > 0) {
4723 yaffs_HandleShadowedObject(dev,
4729 yaffs_SetObjectName(in, oh->name);
4732 /* directory stuff...
4737 yaffs_FindOrCreateObjectByNumber
4738 (dev, oh->parentObjectId,
4739 YAFFS_OBJECT_TYPE_DIRECTORY);
4740 if (parent->variantType ==
4741 YAFFS_OBJECT_TYPE_UNKNOWN) {
4742 /* Set up as a directory */
4743 parent->variantType =
4744 YAFFS_OBJECT_TYPE_DIRECTORY;
4745 INIT_LIST_HEAD(&parent->variant.
4748 } else if (parent->variantType !=
4749 YAFFS_OBJECT_TYPE_DIRECTORY)
4751 /* Hoosterman, another problem....
4752 * We're trying to use a non-directory as a directory
4755 T(YAFFS_TRACE_ERROR,
4757 ("yaffs tragedy: attempting to use non-directory as"
4758 " a directory in scan. Put in lost+found."
4760 parent = dev->lostNFoundDir;
4763 yaffs_AddObjectToDirectory(parent, in);
4765 if ((parent == dev->deletedDir ||
4766 parent == dev->unlinkedDir)) {
4767 /* If it is unlinked at start up then it wants deleting */
4772 /* Mark the block as having a shrinkHeader */
4773 bi->hasShrinkHeader = 1;
4776 /* Note re hardlinks.
4777 * Since we might scan a hardlink before its equivalent object is scanned
4778 * we put them all in a list.
4779 * After scanning is complete, we should have all the objects, so we run
4780 * through this list and fix up all the chains.
4783 switch (in->variantType) {
4784 case YAFFS_OBJECT_TYPE_UNKNOWN:
4785 /* Todo got a problem */
4787 case YAFFS_OBJECT_TYPE_FILE:
4789 if (in->variant.fileVariant.
4792 /* This covers the case where the file size is greater
4793 * than where the data is
4794 * This will happen if the file is resized to be larger
4795 * than its current data extents.
4797 in->variant.fileVariant.fileSize =
4799 in->variant.fileVariant.scannedFileSize =
4800 in->variant.fileVariant.fileSize;
4804 in->variant.fileVariant.shrinkSize >
4806 in->variant.fileVariant.shrinkSize =
4811 case YAFFS_OBJECT_TYPE_HARDLINK:
4812 in->variant.hardLinkVariant.equivalentObjectId =
4813 oh->equivalentObjectId;
4814 in->hardLinks.next =
4815 (struct list_head *) hardList;
4818 case YAFFS_OBJECT_TYPE_DIRECTORY:
4821 case YAFFS_OBJECT_TYPE_SPECIAL:
4824 case YAFFS_OBJECT_TYPE_SYMLINK:
4825 in->variant.symLinkVariant.
4827 yaffs_CloneString(oh->
4836 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4837 /* If we got this far while scanning, then the block is fully allocated. */
4838 state = YAFFS_BLOCK_STATE_FULL;
4841 bi->blockState = state;
4843 /* Now let's see if it was dirty */
4844 if (bi->pagesInUse == 0 &&
4845 !bi->hasShrinkHeader &&
4846 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
4847 yaffs_BlockBecameDirty(dev, blk);
4855 /* Ok, we've done all the scanning.
4856 * Fix up the hard link chains.
4857 * We should now have scanned all the objects, now it's time to add these
4862 hardList = (yaffs_Object *) (hardList->hardLinks.next);
4864 in = yaffs_FindObjectByNumber(dev,
4865 hl->variant.hardLinkVariant.
4866 equivalentObjectId);
4869 /* Add the hardlink pointers */
4870 hl->variant.hardLinkVariant.equivalentObject = in;
4871 list_add(&hl->hardLinks, &in->hardLinks);
4873 /* Todo Need to report/handle this better.
4874 * Got a problem... hardlink to a non-existant object
4876 hl->variant.hardLinkVariant.equivalentObject = NULL;
4877 INIT_LIST_HEAD(&hl->hardLinks);
4884 struct list_head *i;
4885 struct list_head *n;
4889 /* Soft delete all the unlinked files */
4890 list_for_each_safe(i, n,
4891 &dev->unlinkedDir->variant.directoryVariant.
4894 l = list_entry(i, yaffs_Object, siblings);
4895 yaffs_DestroyObject(l);
4899 /* Soft delete all the deletedDir files */
4900 list_for_each_safe(i, n,
4901 &dev->deletedDir->variant.directoryVariant.
4904 l = list_entry(i, yaffs_Object, siblings);
4905 yaffs_DestroyObject(l);
4911 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
4913 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
4918 /*------------------------------ Directory Functions ----------------------------- */
4920 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
4922 yaffs_Device *dev = obj->myDev;
4924 if(dev && dev->removeObjectCallback)
4925 dev->removeObjectCallback(obj);
4927 list_del_init(&obj->siblings);
4932 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
4937 T(YAFFS_TRACE_ALWAYS,
4939 ("tragedy: Trying to add an object to a null pointer directory"
4943 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4944 T(YAFFS_TRACE_ALWAYS,
4946 ("tragedy: Trying to add an object to a non-directory"
4951 if (obj->siblings.prev == NULL) {
4952 /* Not initialised */
4953 INIT_LIST_HEAD(&obj->siblings);
4955 } else if (!list_empty(&obj->siblings)) {
4956 /* If it is holed up somewhere else, un hook it */
4957 yaffs_RemoveObjectFromDirectory(obj);
4960 list_add(&obj->siblings, &directory->variant.directoryVariant.children);
4961 obj->parent = directory;
4963 if (directory == obj->myDev->unlinkedDir
4964 || directory == obj->myDev->deletedDir) {
4966 obj->myDev->nUnlinkedFiles++;
4967 obj->renameAllowed = 0;
4971 yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
4976 struct list_head *i;
4977 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
4986 T(YAFFS_TRACE_ALWAYS,
4988 ("tragedy: yaffs_FindObjectByName: null pointer directory"
4992 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4993 T(YAFFS_TRACE_ALWAYS,
4995 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
4999 sum = yaffs_CalcNameSum(name);
5001 list_for_each(i, &directory->variant.directoryVariant.children) {
5003 l = list_entry(i, yaffs_Object, siblings);
5005 /* Special case for lost-n-found */
5006 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
5007 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
5010 } else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
5012 /* LostnFound cunk called Objxxx
5015 yaffs_GetObjectName(l, buffer,
5016 YAFFS_MAX_NAME_LENGTH);
5017 if (yaffs_strcmp(name, buffer) == 0) {
5030 int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
5031 int (*fn) (yaffs_Object *))
5033 struct list_head *i;
5037 T(YAFFS_TRACE_ALWAYS,
5039 ("tragedy: yaffs_FindObjectByName: null pointer directory"
5043 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
5044 T(YAFFS_TRACE_ALWAYS,
5046 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
5050 list_for_each(i, &theDir->variant.directoryVariant.children) {
5052 l = list_entry(i, yaffs_Object, siblings);
5064 /* GetEquivalentObject dereferences any hard links to get to the
5068 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
5070 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5071 /* We want the object id of the equivalent object, not this one */
5072 obj = obj->variant.hardLinkVariant.equivalentObject;
5078 int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
5080 memset(name, 0, buffSize * sizeof(YCHAR));
5082 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
5083 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
5084 } else if (obj->chunkId <= 0) {
5086 /* make up a name */
5087 yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
5089 yaffs_strncpy(name, locName, buffSize - 1);
5092 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
5093 else if (obj->shortName[0]) {
5094 yaffs_strcpy(name, obj->shortName);
5098 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
5100 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
5102 memset(buffer, 0, obj->myDev->nBytesPerChunk);
5104 if (obj->chunkId >= 0) {
5105 yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
5106 obj->chunkId, buffer,
5109 yaffs_strncpy(name, oh->name, buffSize - 1);
5111 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
5114 return yaffs_strlen(name);
5117 int yaffs_GetObjectFileLength(yaffs_Object * obj)
5120 /* Dereference any hard linking */
5121 obj = yaffs_GetEquivalentObject(obj);
5123 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
5124 return obj->variant.fileVariant.fileSize;
5126 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
5127 return yaffs_strlen(obj->variant.symLinkVariant.alias);
5129 /* Only a directory should drop through to here */
5130 return obj->myDev->nBytesPerChunk;
5134 int yaffs_GetObjectLinkCount(yaffs_Object * obj)
5137 struct list_head *i;
5139 if (!obj->unlinked) {
5140 count++; /* the object itself */
5142 list_for_each(i, &obj->hardLinks) {
5143 count++; /* add the hard links; */
5149 int yaffs_GetObjectInode(yaffs_Object * obj)
5151 obj = yaffs_GetEquivalentObject(obj);
5153 return obj->objectId;
5156 unsigned yaffs_GetObjectType(yaffs_Object * obj)
5158 obj = yaffs_GetEquivalentObject(obj);
5160 switch (obj->variantType) {
5161 case YAFFS_OBJECT_TYPE_FILE:
5164 case YAFFS_OBJECT_TYPE_DIRECTORY:
5167 case YAFFS_OBJECT_TYPE_SYMLINK:
5170 case YAFFS_OBJECT_TYPE_HARDLINK:
5173 case YAFFS_OBJECT_TYPE_SPECIAL:
5174 if (S_ISFIFO(obj->yst_mode))
5176 if (S_ISCHR(obj->yst_mode))
5178 if (S_ISBLK(obj->yst_mode))
5180 if (S_ISSOCK(obj->yst_mode))
5188 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
5190 obj = yaffs_GetEquivalentObject(obj);
5191 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
5192 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
5194 return yaffs_CloneString(_Y(""));
5198 #ifndef CONFIG_YAFFS_WINCE
5200 int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
5202 unsigned int valid = attr->ia_valid;
5204 if (valid & ATTR_MODE)
5205 obj->yst_mode = attr->ia_mode;
5206 if (valid & ATTR_UID)
5207 obj->yst_uid = attr->ia_uid;
5208 if (valid & ATTR_GID)
5209 obj->yst_gid = attr->ia_gid;
5211 if (valid & ATTR_ATIME)
5212 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
5213 if (valid & ATTR_CTIME)
5214 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
5215 if (valid & ATTR_MTIME)
5216 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
5218 if (valid & ATTR_SIZE)
5219 yaffs_ResizeFile(obj, attr->ia_size);
5221 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
5226 int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
5228 unsigned int valid = 0;
5230 attr->ia_mode = obj->yst_mode;
5232 attr->ia_uid = obj->yst_uid;
5234 attr->ia_gid = obj->yst_gid;
5237 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
5238 valid |= ATTR_ATIME;
5239 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
5240 valid |= ATTR_CTIME;
5241 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
5242 valid |= ATTR_MTIME;
5244 attr->ia_size = yaffs_GetFileSize(obj);
5247 attr->ia_valid = valid;
5256 int yaffs_DumpObject(yaffs_Object * obj)
5260 yaffs_GetObjectName(obj, name, 256);
5262 T(YAFFS_TRACE_ALWAYS,
5264 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
5265 " chunk %d type %d size %d\n"
5266 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
5267 obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
5268 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
5274 /*---------------------------- Initialisation code -------------------------------------- */
5276 static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
5279 /* Common functions, gotta have */
5280 if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
5283 #ifdef CONFIG_YAFFS_YAFFS2
5285 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
5286 if (dev->writeChunkWithTagsToNAND &&
5287 dev->readChunkWithTagsFromNAND &&
5288 !dev->writeChunkToNAND &&
5289 !dev->readChunkFromNAND &&
5290 dev->markNANDBlockBad && dev->queryNANDBlock)
5294 /* Can use the "spare" style interface for yaffs1 */
5295 if (!dev->isYaffs2 &&
5296 !dev->writeChunkWithTagsToNAND &&
5297 !dev->readChunkWithTagsFromNAND &&
5298 dev->writeChunkToNAND &&
5299 dev->readChunkFromNAND &&
5300 !dev->markNANDBlockBad && !dev->queryNANDBlock)
5306 int yaffs_GutsInitialise(yaffs_Device * dev)
5313 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
5315 /* Check stuff that must be set */
5318 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
5322 dev->internalStartBlock = dev->startBlock;
5323 dev->internalEndBlock = dev->endBlock;
5324 dev->blockOffset = 0;
5325 dev->chunkOffset = 0;
5326 dev->nFreeChunks = 0;
5328 if (dev->startBlock == 0) {
5329 dev->internalStartBlock = dev->startBlock + 1;
5330 dev->internalEndBlock = dev->endBlock + 1;
5331 dev->blockOffset = 1;
5332 dev->chunkOffset = dev->nChunksPerBlock;
5335 /* Check geometry parameters. */
5337 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
5339 T(YAFFS_TRACE_ALWAYS,
5341 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
5342 TENDSTR), dev->nBytesPerChunk, dev->isYaffs2 ? "2" : ""));
5346 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
5347 T(YAFFS_TRACE_ALWAYS,
5348 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
5352 /* Got the right mix of functions? */
5353 if (!yaffs_CheckDevFunctions(dev)) {
5354 /* Function missing */
5355 T(YAFFS_TRACE_ALWAYS,
5357 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
5362 /* This is really a compilation check. */
5363 if (!yaffs_CheckStructures()) {
5364 T(YAFFS_TRACE_ALWAYS,
5365 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
5369 if (dev->isMounted) {
5370 T(YAFFS_TRACE_ALWAYS,
5371 (TSTR("yaffs: device already mounted\n" TENDSTR)));
5375 /* Finished with most checks. One or two more checks happen later on too. */
5379 nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5381 /* OK now calculate a few things for the device
5382 * Calculate chunkGroupBits.
5383 * We need to find the next power of 2 > than internalEndBlock
5386 x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
5388 for (bits = extraBits = 0; x > 1; bits++) {
5397 /* Level0 Tnodes are 16 bits, so if the bitwidth of the
5398 * chunk range we're using is greater than 16 we need
5399 * to figure out chunk shift and chunkGroupSize
5402 dev->chunkGroupBits = 0;
5404 dev->chunkGroupBits = bits - 16;
5407 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
5409 if (dev->nChunksPerBlock < dev->chunkGroupSize) {
5410 /* We have a problem because the soft delete won't work if
5411 * the chunk group size > chunks per block.
5412 * This can be remedied by using larger "virtual blocks".
5414 T(YAFFS_TRACE_ALWAYS,
5415 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
5420 /* OK, we've finished verifying the device, lets continue with initialisation */
5422 /* More device initialisation */
5423 dev->garbageCollections = 0;
5424 dev->passiveGarbageCollections = 0;
5425 dev->currentDirtyChecker = 0;
5426 dev->bufferedBlock = -1;
5427 dev->doingBufferedBlockRewrite = 0;
5428 dev->nDeletedFiles = 0;
5429 dev->nBackgroundDeletions = 0;
5430 dev->nUnlinkedFiles = 0;
5432 dev->eccUnfixed = 0;
5433 dev->tagsEccFixed = 0;
5434 dev->tagsEccUnfixed = 0;
5435 dev->nErasureFailures = 0;
5436 dev->nErasedBlocks = 0;
5439 /* Initialise temporary buffers */
5442 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
5443 dev->tempBuffer[i].line = 0; /* not in use */
5444 dev->tempBuffer[i].buffer =
5445 YMALLOC(dev->nBytesPerChunk);
5449 yaffs_InitialiseBlocks(dev, nBlocks);
5451 yaffs_InitialiseTnodes(dev);
5453 yaffs_InitialiseObjects(dev);
5455 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
5457 if (dev->nShortOpCaches > 0) {
5460 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
5461 dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
5465 YMALLOC(dev->nShortOpCaches * sizeof(yaffs_ChunkCache));
5467 for (i = 0; i < dev->nShortOpCaches; i++) {
5468 dev->srCache[i].object = NULL;
5469 dev->srCache[i].lastUse = 0;
5470 dev->srCache[i].dirty = 0;
5471 dev->srCache[i].data = YMALLOC(dev->nBytesPerChunk);
5478 /* Initialise the unlinked, root and lost and found directories */
5479 dev->lostNFoundDir = dev->rootDir = NULL;
5480 dev->unlinkedDir = dev->deletedDir = NULL;
5483 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
5485 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
5488 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
5489 YAFFS_ROOT_MODE | S_IFDIR);
5490 dev->lostNFoundDir =
5491 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
5492 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
5493 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
5495 if (dev->isYaffs2) {
5496 dev->useHeaderFileSize = 1;
5499 /* Now scan the flash. */
5501 yaffs_ScanBackwards(dev);
5505 /* Zero out stats */
5506 dev->nPageReads = 0;
5507 dev->nPageWrites = 0;
5508 dev->nBlockErasures = 0;
5510 dev->nRetriedWrites = 0;
5512 dev->nRetiredBlocks = 0;
5514 yaffs_VerifyFreeChunks(dev);
5516 T(YAFFS_TRACE_ALWAYS,
5517 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
5522 void yaffs_Deinitialise(yaffs_Device * dev)
5524 if (dev->isMounted) {
5527 yaffs_DeinitialiseBlocks(dev);
5528 yaffs_DeinitialiseTnodes(dev);
5529 yaffs_DeinitialiseObjects(dev);
5530 if (dev->nShortOpCaches > 0) {
5532 for (i = 0; i < dev->nShortOpCaches; i++) {
5533 YFREE(dev->srCache[i].data);
5536 YFREE(dev->srCache);
5539 YFREE(dev->gcCleanupList);
5541 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
5542 YFREE(dev->tempBuffer[i].buffer);
5550 static int yaffs_CountFreeChunks(yaffs_Device * dev)
5555 yaffs_BlockInfo *blk;
5557 for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
5559 blk = yaffs_GetBlockInfo(dev, b);
5561 switch (blk->blockState) {
5562 case YAFFS_BLOCK_STATE_EMPTY:
5563 case YAFFS_BLOCK_STATE_ALLOCATING:
5564 case YAFFS_BLOCK_STATE_COLLECTING:
5565 case YAFFS_BLOCK_STATE_FULL:
5567 (dev->nChunksPerBlock - blk->pagesInUse +
5568 blk->softDeletions);
5579 int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
5581 /* This is what we report to the outside world */
5584 int nDirtyCacheChunks;
5587 nFree = dev->nFreeChunks;
5589 nFree = yaffs_CountFreeChunks(dev);
5592 /* Now count the number of dirty chunks in the cache and subtract those */
5596 for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
5597 if (dev->srCache[i].dirty)
5598 nDirtyCacheChunks++;
5602 nFree -= nDirtyCacheChunks;
5604 nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
5613 static int yaffs_freeVerificationFailures;
5615 static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
5617 int counted = yaffs_CountFreeChunks(dev);
5619 int difference = dev->nFreeChunks - counted;
5622 T(YAFFS_TRACE_ALWAYS,
5623 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
5624 dev->nFreeChunks, counted, difference));
5625 yaffs_freeVerificationFailures++;
5629 /*---------------------------------------- YAFFS test code ----------------------*/
5631 #define yaffs_CheckStruct(structure,syze, name) \
5632 if(sizeof(structure) != syze) \
5634 T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
5635 name,syze,sizeof(structure))); \
5636 return YAFFS_FAIL; \
5639 static int yaffs_CheckStructures(void)
5641 /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
5642 /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
5643 /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
5644 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
5645 yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
5647 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")