2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2007 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.
14 const char *yaffs_guts_c_version =
19 #include "yaffsinterface.h"
20 #include "yaffs_guts.h"
21 #include "yaffs_tagsvalidity.h"
22 #include "yaffs_getblockinfo.h"
24 #include "yaffs_tagscompat.h"
25 #ifndef CONFIG_YAFFS_USE_OWN_SORT
26 #include "yaffs_qsort.h"
28 #include "yaffs_nand.h"
30 #include "yaffs_checkptrw.h"
32 #include "yaffs_nand.h"
33 #include "yaffs_packedtags2.h"
36 #define YAFFS_PASSIVE_GC_CHUNKS 2
38 #include "yaffs_ecc.h"
41 /* Robustification (if it ever comes about...) */
42 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND);
43 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
45 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
47 const yaffs_ExtendedTags *tags);
48 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
49 const yaffs_ExtendedTags *tags);
51 /* Other local prototypes */
52 static void yaffs_UpdateParent(yaffs_Object *obj);
53 static int yaffs_UnlinkObject(yaffs_Object *obj);
54 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
56 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
58 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev,
60 yaffs_ExtendedTags *tags,
62 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
63 int chunkInNAND, int inScan);
65 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
66 yaffs_ObjectType type);
67 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
69 static int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name,
70 int force, int isShrink, int shadows);
71 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
72 static int yaffs_CheckStructures(void);
73 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
74 int chunkOffset, int *limit);
75 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
77 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev, int blockNo);
80 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
83 static int yaffs_UnlinkWorker(yaffs_Object *obj);
85 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
88 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
89 yaffs_BlockInfo **blockUsedPtr);
91 static void yaffs_VerifyFreeChunks(yaffs_Device *dev);
93 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
95 static void yaffs_VerifyDirectory(yaffs_Object *directory);
97 static int yaffs_CheckFileSanity(yaffs_Object *in);
99 #define yaffs_CheckFileSanity(in)
102 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
103 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
105 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
107 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
108 yaffs_ExtendedTags *tags);
110 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
112 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
113 yaffs_FileStructure *fStruct,
117 /* Function to calculate chunk and offset */
119 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut,
125 chunk = (__u32)(addr >> dev->chunkShift);
127 if (dev->chunkDiv == 1) {
128 /* easy power of 2 case */
129 offset = (__u32)(addr & dev->chunkMask);
131 /* Non power-of-2 case */
135 chunk /= dev->chunkDiv;
137 chunkBase = ((loff_t)chunk) * dev->nDataBytesPerChunk;
138 offset = (__u32)(addr - chunkBase);
145 /* Function to return the number of shifts for a power of 2 greater than or
146 * equal to the given number
147 * Note we don't try to cater for all possible numbers and this does not have to
148 * be hellishly efficient.
151 static __u32 ShiftsGE(__u32 x)
156 nShifts = extraBits = 0;
171 /* Function to return the number of shifts to get a 1 in bit 0
174 static __u32 Shifts(__u32 x)
194 * Temporary buffer manipulations.
197 static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
200 __u8 *buf = (__u8 *)1;
202 memset(dev->tempBuffer, 0, sizeof(dev->tempBuffer));
204 for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
205 dev->tempBuffer[i].line = 0; /* not in use */
206 dev->tempBuffer[i].buffer = buf =
207 YMALLOC_DMA(dev->totalBytesPerChunk);
210 return buf ? YAFFS_OK : YAFFS_FAIL;
213 __u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo)
218 if (dev->tempInUse > dev->maxTemp)
219 dev->maxTemp = dev->tempInUse;
221 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
222 if (dev->tempBuffer[i].line == 0) {
223 dev->tempBuffer[i].line = lineNo;
224 if ((i + 1) > dev->maxTemp) {
225 dev->maxTemp = i + 1;
226 for (j = 0; j <= i; j++)
227 dev->tempBuffer[j].maxLine =
228 dev->tempBuffer[j].line;
231 return dev->tempBuffer[i].buffer;
235 T(YAFFS_TRACE_BUFFERS,
236 (TSTR("Out of temp buffers at line %d, other held by lines:"),
238 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
239 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
241 T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
244 * If we got here then we have to allocate an unmanaged one
248 dev->unmanagedTempAllocations++;
249 return YMALLOC(dev->nDataBytesPerChunk);
253 void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer,
260 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
261 if (dev->tempBuffer[i].buffer == buffer) {
262 dev->tempBuffer[i].line = 0;
268 /* assume it is an unmanaged one. */
269 T(YAFFS_TRACE_BUFFERS,
270 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
273 dev->unmanagedTempDeallocations++;
279 * Determine if we have a managed buffer.
281 int yaffs_IsManagedTempBuffer(yaffs_Device *dev, const __u8 *buffer)
285 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
286 if (dev->tempBuffer[i].buffer == buffer)
290 for (i = 0; i < dev->nShortOpCaches; i++) {
291 if (dev->srCache[i].data == buffer)
295 if (buffer == dev->checkpointBuffer)
298 T(YAFFS_TRACE_ALWAYS,
299 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
306 * Chunk bitmap manipulations
309 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
311 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
313 (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
317 return dev->chunkBits +
318 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
321 static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
323 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
324 chunk < 0 || chunk >= dev->nChunksPerBlock) {
326 (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
332 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
334 __u8 *blkBits = yaffs_BlockBits(dev, blk);
336 memset(blkBits, 0, dev->chunkBitmapStride);
339 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk)
341 __u8 *blkBits = yaffs_BlockBits(dev, blk);
343 yaffs_VerifyChunkBitId(dev, blk, chunk);
345 blkBits[chunk / 8] &= ~(1 << (chunk & 7));
348 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk)
350 __u8 *blkBits = yaffs_BlockBits(dev, blk);
352 yaffs_VerifyChunkBitId(dev, blk, chunk);
354 blkBits[chunk / 8] |= (1 << (chunk & 7));
357 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk)
359 __u8 *blkBits = yaffs_BlockBits(dev, blk);
360 yaffs_VerifyChunkBitId(dev, blk, chunk);
362 return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
365 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk)
367 __u8 *blkBits = yaffs_BlockBits(dev, blk);
369 for (i = 0; i < dev->chunkBitmapStride; i++) {
377 static int yaffs_CountChunkBits(yaffs_Device *dev, int blk)
379 __u8 *blkBits = yaffs_BlockBits(dev, blk);
382 for (i = 0; i < dev->chunkBitmapStride; i++) {
399 static int yaffs_SkipVerification(yaffs_Device *dev)
401 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
404 static int yaffs_SkipFullVerification(yaffs_Device *dev)
406 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
409 static int yaffs_SkipNANDVerification(yaffs_Device *dev)
411 return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
414 static const char *blockStateName[] = {
427 static void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
432 if (yaffs_SkipVerification(dev))
435 /* Report illegal runtime states */
436 if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
437 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState));
439 switch (bi->blockState) {
440 case YAFFS_BLOCK_STATE_UNKNOWN:
441 case YAFFS_BLOCK_STATE_SCANNING:
442 case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
443 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
444 n, blockStateName[bi->blockState]));
447 /* Check pages in use and soft deletions are legal */
449 actuallyUsed = bi->pagesInUse - bi->softDeletions;
451 if (bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
452 bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
453 actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
454 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
455 n, bi->pagesInUse, bi->softDeletions));
458 /* Check chunk bitmap legal */
459 inUse = yaffs_CountChunkBits(dev, n);
460 if (inUse != bi->pagesInUse)
461 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
462 n, bi->pagesInUse, inUse));
464 /* Check that the sequence number is valid.
465 * Ten million is legal, but is very unlikely
468 (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
469 (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000))
470 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has suspect sequence number of %d"TENDSTR),
471 n, bi->sequenceNumber));
474 static void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi,
477 yaffs_VerifyBlock(dev, bi, n);
479 /* After collection the block should be in the erased state */
480 /* This will need to change if we do partial gc */
482 if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
483 bi->blockState != YAFFS_BLOCK_STATE_EMPTY) {
484 T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
489 static void yaffs_VerifyBlocks(yaffs_Device *dev)
492 int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
493 int nIllegalBlockStates = 0;
495 if (yaffs_SkipVerification(dev))
498 memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
500 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
501 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
502 yaffs_VerifyBlock(dev, bi, i);
504 if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
505 nBlocksPerState[bi->blockState]++;
507 nIllegalBlockStates++;
510 T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
511 T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
513 T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
514 if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
515 T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
517 for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
518 T(YAFFS_TRACE_VERIFY,
519 (TSTR("%s %d blocks"TENDSTR),
520 blockStateName[i], nBlocksPerState[i]));
522 if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
523 T(YAFFS_TRACE_VERIFY,
524 (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
525 dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
527 if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
528 T(YAFFS_TRACE_VERIFY,
529 (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
530 dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
532 if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
533 T(YAFFS_TRACE_VERIFY,
534 (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
535 nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
537 T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
542 * Verify the object header. oh must be valid, but obj and tags may be NULL in which
543 * case those tests will not be performed.
545 static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
547 if (obj && yaffs_SkipVerification(obj->myDev))
550 if (!(tags && obj && oh)) {
551 T(YAFFS_TRACE_VERIFY,
552 (TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
553 (__u32)tags, (__u32)obj, (__u32)oh));
557 if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
558 oh->type > YAFFS_OBJECT_TYPE_MAX)
559 T(YAFFS_TRACE_VERIFY,
560 (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
561 tags->objectId, oh->type));
563 if (tags->objectId != obj->objectId)
564 T(YAFFS_TRACE_VERIFY,
565 (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
566 tags->objectId, obj->objectId));
570 * Check that the object's parent ids match if parentCheck requested.
572 * Tests do not apply to the root object.
575 if (parentCheck && tags->objectId > 1 && !obj->parent)
576 T(YAFFS_TRACE_VERIFY,
577 (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
578 tags->objectId, oh->parentObjectId));
580 if (parentCheck && obj->parent &&
581 oh->parentObjectId != obj->parent->objectId &&
582 (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
583 obj->parent->objectId != YAFFS_OBJECTID_DELETED))
584 T(YAFFS_TRACE_VERIFY,
585 (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
586 tags->objectId, oh->parentObjectId, obj->parent->objectId));
588 if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */
589 T(YAFFS_TRACE_VERIFY,
590 (TSTR("Obj %d header name is NULL"TENDSTR),
593 if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
594 T(YAFFS_TRACE_VERIFY,
595 (TSTR("Obj %d header name is 0xFF"TENDSTR),
601 static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
602 __u32 level, int chunkOffset)
605 yaffs_Device *dev = obj->myDev;
611 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
612 if (tn->internal[i]) {
613 ok = yaffs_VerifyTnodeWorker(obj,
616 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
619 } else if (level == 0) {
620 yaffs_ExtendedTags tags;
621 __u32 objectId = obj->objectId;
623 chunkOffset <<= YAFFS_TNODES_LEVEL0_BITS;
625 for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
626 __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
629 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
630 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
631 if (tags.objectId != objectId || tags.chunkId != chunkOffset) {
632 T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
633 objectId, chunkOffset, theChunk,
634 tags.objectId, tags.chunkId));
647 static void yaffs_VerifyFile(yaffs_Object *obj)
649 int requiredTallness;
655 yaffs_ExtendedTags tags;
662 if (yaffs_SkipVerification(obj->myDev))
666 objectId = obj->objectId;
668 /* Check file size is consistent with tnode depth */
669 lastChunk = obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
670 x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
671 requiredTallness = 0;
673 x >>= YAFFS_TNODES_INTERNAL_BITS;
677 actualTallness = obj->variant.fileVariant.topLevel;
679 if (requiredTallness > actualTallness)
680 T(YAFFS_TRACE_VERIFY,
681 (TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
682 obj->objectId, actualTallness, requiredTallness));
685 /* Check that the chunks in the tnode tree are all correct.
686 * We do this by scanning through the tnode tree and
687 * checking the tags for every chunk match.
690 if (yaffs_SkipNANDVerification(dev))
693 for (i = 1; i <= lastChunk; i++) {
694 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i);
697 __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
699 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
700 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
701 if (tags.objectId != objectId || tags.chunkId != i) {
702 T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
703 objectId, i, theChunk,
704 tags.objectId, tags.chunkId));
712 static void yaffs_VerifyHardLink(yaffs_Object *obj)
714 if (obj && yaffs_SkipVerification(obj->myDev))
717 /* Verify sane equivalent object */
720 static void yaffs_VerifySymlink(yaffs_Object *obj)
722 if (obj && yaffs_SkipVerification(obj->myDev))
725 /* Verify symlink string */
728 static void yaffs_VerifySpecial(yaffs_Object *obj)
730 if (obj && yaffs_SkipVerification(obj->myDev))
734 static void yaffs_VerifyObject(yaffs_Object *obj)
743 __u32 chunkShouldNotBeDeleted;
749 if (obj->beingCreated)
754 if (yaffs_SkipVerification(dev))
757 /* Check sane object header chunk */
759 chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
760 chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
762 chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
763 chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
764 chunkValid = chunkInRange &&
765 yaffs_CheckChunkBit(dev,
766 obj->hdrChunk / dev->nChunksPerBlock,
767 obj->hdrChunk % dev->nChunksPerBlock);
768 chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
771 (!chunkIdOk || chunkShouldNotBeDeleted)) {
772 T(YAFFS_TRACE_VERIFY,
773 (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
774 obj->objectId, obj->hdrChunk,
775 chunkIdOk ? "" : ",out of range",
776 chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
779 if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
780 yaffs_ExtendedTags tags;
781 yaffs_ObjectHeader *oh;
782 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
784 oh = (yaffs_ObjectHeader *)buffer;
786 yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer,
789 yaffs_VerifyObjectHeader(obj, oh, &tags, 1);
791 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
794 /* Verify it has a parent */
795 if (obj && !obj->fake &&
796 (!obj->parent || obj->parent->myDev != dev)) {
797 T(YAFFS_TRACE_VERIFY,
798 (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
799 obj->objectId, obj->parent));
802 /* Verify parent is a directory */
803 if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
804 T(YAFFS_TRACE_VERIFY,
805 (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
806 obj->objectId, obj->parent->variantType));
809 switch (obj->variantType) {
810 case YAFFS_OBJECT_TYPE_FILE:
811 yaffs_VerifyFile(obj);
813 case YAFFS_OBJECT_TYPE_SYMLINK:
814 yaffs_VerifySymlink(obj);
816 case YAFFS_OBJECT_TYPE_DIRECTORY:
817 yaffs_VerifyDirectory(obj);
819 case YAFFS_OBJECT_TYPE_HARDLINK:
820 yaffs_VerifyHardLink(obj);
822 case YAFFS_OBJECT_TYPE_SPECIAL:
823 yaffs_VerifySpecial(obj);
825 case YAFFS_OBJECT_TYPE_UNKNOWN:
827 T(YAFFS_TRACE_VERIFY,
828 (TSTR("Obj %d has illegaltype %d"TENDSTR),
829 obj->objectId, obj->variantType));
834 static void yaffs_VerifyObjects(yaffs_Device *dev)
838 struct ylist_head *lh;
840 if (yaffs_SkipVerification(dev))
843 /* Iterate through the objects in each hash entry */
845 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
846 ylist_for_each(lh, &dev->objectBucket[i].list) {
848 obj = ylist_entry(lh, yaffs_Object, hashLink);
849 yaffs_VerifyObject(obj);
857 * Simple hash function. Needs to have a reasonable spread
860 static Y_INLINE int yaffs_HashFunction(int n)
863 return n % YAFFS_NOBJECT_BUCKETS;
867 * Access functions to useful fake objects.
868 * Note that root might have a presence in NAND if permissions are set.
871 yaffs_Object *yaffs_Root(yaffs_Device *dev)
876 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
878 return dev->lostNFoundDir;
883 * Erased NAND checking functions
886 int yaffs_CheckFF(__u8 *buffer, int nBytes)
888 /* Horrible, slow implementation */
897 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
900 int retval = YAFFS_OK;
901 __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
902 yaffs_ExtendedTags tags;
905 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
907 if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
910 if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
911 T(YAFFS_TRACE_NANDACCESS,
912 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
916 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
922 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
924 yaffs_ExtendedTags *tags,
931 yaffs_InvalidateCheckpoint(dev);
934 yaffs_BlockInfo *bi = 0;
937 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
943 /* First check this chunk is erased, if it needs
944 * checking. The checking policy (unless forced
945 * always on) is as follows:
947 * Check the first page we try to write in a block.
948 * If the check passes then we don't need to check any
949 * more. If the check fails, we check again...
950 * If the block has been erased, we don't need to check.
952 * However, if the block has been prioritised for gc,
953 * then we think there might be something odd about
954 * this block and stop using it.
956 * Rationale: We should only ever see chunks that have
957 * not been erased if there was a partially written
958 * chunk due to power loss. This checking policy should
959 * catch that case with very few checks and thus save a
960 * lot of checks that are most likely not needed.
962 if (bi->gcPrioritise) {
963 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
964 /* try another chunk */
968 /* let's give it a try */
971 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
972 bi->skipErasedCheck = 0;
974 if (!bi->skipErasedCheck) {
975 erasedOk = yaffs_CheckChunkErased(dev, chunk);
976 if (erasedOk != YAFFS_OK) {
978 (TSTR("**>> yaffs chunk %d was not erased"
981 /* try another chunk */
984 bi->skipErasedCheck = 1;
987 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
989 if (writeOk != YAFFS_OK) {
990 yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
991 /* try another chunk */
995 /* Copy the data into the robustification buffer */
996 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
998 } while (writeOk != YAFFS_OK &&
999 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
1005 T(YAFFS_TRACE_ERROR,
1006 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
1009 dev->nRetriedWrites += (attempts - 1);
1016 * Block retiring for handling a broken block.
1019 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
1021 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1023 yaffs_InvalidateCheckpoint(dev);
1025 if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
1026 if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
1027 T(YAFFS_TRACE_ALWAYS, (TSTR(
1028 "yaffs: Failed to mark bad and erase block %d"
1029 TENDSTR), blockInNAND));
1031 yaffs_ExtendedTags tags;
1032 int chunkId = blockInNAND * dev->nChunksPerBlock;
1034 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
1036 memset(buffer, 0xff, dev->nDataBytesPerChunk);
1037 yaffs_InitialiseTags(&tags);
1038 tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
1039 if (dev->writeChunkWithTagsToNAND(dev, chunkId -
1040 dev->chunkOffset, buffer, &tags) != YAFFS_OK)
1041 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
1042 TCONT("write bad block marker to block %d")
1043 TENDSTR), blockInNAND));
1045 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
1049 bi->blockState = YAFFS_BLOCK_STATE_DEAD;
1050 bi->gcPrioritise = 0;
1051 bi->needsRetiring = 0;
1053 dev->nRetiredBlocks++;
1057 * Functions for robustisizing TODO
1061 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
1063 const yaffs_ExtendedTags *tags)
1067 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
1068 const yaffs_ExtendedTags *tags)
1072 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1074 if (!bi->gcPrioritise) {
1075 bi->gcPrioritise = 1;
1076 dev->hasPendingPrioritisedGCs = 1;
1077 bi->chunkErrorStrikes++;
1079 if (bi->chunkErrorStrikes > 3) {
1080 bi->needsRetiring = 1; /* Too many stikes, so retire this */
1081 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1087 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
1090 int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
1091 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1093 yaffs_HandleChunkError(dev, bi);
1096 /* Was an actual write failure, so mark the block for retirement */
1097 bi->needsRetiring = 1;
1098 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1099 (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1102 /* Delete the chunk */
1103 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1107 /*---------------- Name handling functions ------------*/
1109 static __u16 yaffs_CalcNameSum(const YCHAR *name)
1114 const YUCHAR *bname = (const YUCHAR *) name;
1116 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1118 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1119 sum += yaffs_toupper(*bname) * i;
1121 sum += (*bname) * i;
1130 static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
1132 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1133 memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
1134 if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH)
1135 yaffs_strcpy(obj->shortName, name);
1137 obj->shortName[0] = _Y('\0');
1139 obj->sum = yaffs_CalcNameSum(name);
1142 /*-------------------- TNODES -------------------
1144 * List of spare tnodes
1145 * The list is hooked together using the first pointer
1149 /* yaffs_CreateTnodes creates a bunch more tnodes and
1150 * adds them to the tnode free list.
1151 * Don't use this function directly
1154 static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
1158 yaffs_Tnode *newTnodes;
1162 yaffs_TnodeList *tnl;
1167 /* Calculate the tnode size in bytes for variable width tnode support.
1168 * Must be a multiple of 32-bits */
1169 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1171 if (tnodeSize < sizeof(yaffs_Tnode))
1172 tnodeSize = sizeof(yaffs_Tnode);
1174 /* make these things */
1176 newTnodes = YMALLOC(nTnodes * tnodeSize);
1177 mem = (__u8 *)newTnodes;
1180 T(YAFFS_TRACE_ERROR,
1181 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1185 /* Hook them into the free list */
1187 for (i = 0; i < nTnodes - 1; i++) {
1188 newTnodes[i].internal[0] = &newTnodes[i + 1];
1189 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1190 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1194 newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1195 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1196 newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1198 dev->freeTnodes = newTnodes;
1200 /* New hookup for wide tnodes */
1201 for (i = 0; i < nTnodes - 1; i++) {
1202 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1203 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1204 curr->internal[0] = next;
1207 curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1208 curr->internal[0] = dev->freeTnodes;
1209 dev->freeTnodes = (yaffs_Tnode *)mem;
1214 dev->nFreeTnodes += nTnodes;
1215 dev->nTnodesCreated += nTnodes;
1217 /* Now add this bunch of tnodes to a list for freeing up.
1218 * NB If we can't add this to the management list it isn't fatal
1219 * but it just means we can't free this bunch of tnodes later.
1222 tnl = YMALLOC(sizeof(yaffs_TnodeList));
1224 T(YAFFS_TRACE_ERROR,
1226 ("yaffs: Could not add tnodes to management list" TENDSTR)));
1229 tnl->tnodes = newTnodes;
1230 tnl->next = dev->allocatedTnodeList;
1231 dev->allocatedTnodeList = tnl;
1234 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1239 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1241 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device *dev)
1243 yaffs_Tnode *tn = NULL;
1245 /* If there are none left make more */
1246 if (!dev->freeTnodes)
1247 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1249 if (dev->freeTnodes) {
1250 tn = dev->freeTnodes;
1251 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1252 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1253 /* Hoosterman, this thing looks like it isn't in the list */
1254 T(YAFFS_TRACE_ALWAYS,
1255 (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1258 dev->freeTnodes = dev->freeTnodes->internal[0];
1262 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1267 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
1269 yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1270 int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1272 if (tnodeSize < sizeof(yaffs_Tnode))
1273 tnodeSize = sizeof(yaffs_Tnode);
1276 memset(tn, 0, tnodeSize);
1281 /* FreeTnode frees up a tnode and puts it back on the free list */
1282 static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
1285 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1286 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1287 /* Hoosterman, this thing looks like it is already in the list */
1288 T(YAFFS_TRACE_ALWAYS,
1289 (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1291 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1293 tn->internal[0] = dev->freeTnodes;
1294 dev->freeTnodes = tn;
1297 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1300 static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
1302 /* Free the list of allocated tnodes */
1303 yaffs_TnodeList *tmp;
1305 while (dev->allocatedTnodeList) {
1306 tmp = dev->allocatedTnodeList->next;
1308 YFREE(dev->allocatedTnodeList->tnodes);
1309 YFREE(dev->allocatedTnodeList);
1310 dev->allocatedTnodeList = tmp;
1314 dev->freeTnodes = NULL;
1315 dev->nFreeTnodes = 0;
1318 static void yaffs_InitialiseTnodes(yaffs_Device *dev)
1320 dev->allocatedTnodeList = NULL;
1321 dev->freeTnodes = NULL;
1322 dev->nFreeTnodes = 0;
1323 dev->nTnodesCreated = 0;
1327 void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
1330 __u32 *map = (__u32 *)tn;
1336 pos &= YAFFS_TNODES_LEVEL0_MASK;
1337 val >>= dev->chunkGroupBits;
1339 bitInMap = pos * dev->tnodeWidth;
1340 wordInMap = bitInMap / 32;
1341 bitInWord = bitInMap & (32 - 1);
1343 mask = dev->tnodeMask << bitInWord;
1345 map[wordInMap] &= ~mask;
1346 map[wordInMap] |= (mask & (val << bitInWord));
1348 if (dev->tnodeWidth > (32 - bitInWord)) {
1349 bitInWord = (32 - bitInWord);
1351 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1352 map[wordInMap] &= ~mask;
1353 map[wordInMap] |= (mask & (val >> bitInWord));
1357 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
1360 __u32 *map = (__u32 *)tn;
1366 pos &= YAFFS_TNODES_LEVEL0_MASK;
1368 bitInMap = pos * dev->tnodeWidth;
1369 wordInMap = bitInMap / 32;
1370 bitInWord = bitInMap & (32 - 1);
1372 val = map[wordInMap] >> bitInWord;
1374 if (dev->tnodeWidth > (32 - bitInWord)) {
1375 bitInWord = (32 - bitInWord);
1377 val |= (map[wordInMap] << bitInWord);
1380 val &= dev->tnodeMask;
1381 val <<= dev->chunkGroupBits;
1386 /* ------------------- End of individual tnode manipulation -----------------*/
1388 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1389 * The look up tree is represented by the top tnode and the number of topLevel
1390 * in the tree. 0 means only the level 0 tnode is in the tree.
1393 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1394 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
1395 yaffs_FileStructure *fStruct,
1398 yaffs_Tnode *tn = fStruct->top;
1400 int requiredTallness;
1401 int level = fStruct->topLevel;
1403 /* Check sane level and chunk Id */
1404 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
1407 if (chunkId > YAFFS_MAX_CHUNK_ID)
1410 /* First check we're tall enough (ie enough topLevel) */
1412 i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1413 requiredTallness = 0;
1415 i >>= YAFFS_TNODES_INTERNAL_BITS;
1419 if (requiredTallness > fStruct->topLevel)
1420 return NULL; /* Not tall enough, so we can't find it */
1422 /* Traverse down to level 0 */
1423 while (level > 0 && tn) {
1424 tn = tn->internal[(chunkId >>
1425 (YAFFS_TNODES_LEVEL0_BITS +
1427 YAFFS_TNODES_INTERNAL_BITS)) &
1428 YAFFS_TNODES_INTERNAL_MASK];
1435 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1436 * This happens in two steps:
1437 * 1. If the tree isn't tall enough, then make it taller.
1438 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1440 * Used when modifying the tree.
1442 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1443 * be plugged into the ttree.
1446 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
1447 yaffs_FileStructure *fStruct,
1449 yaffs_Tnode *passedTn)
1451 int requiredTallness;
1459 /* Check sane level and page Id */
1460 if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
1463 if (chunkId > YAFFS_MAX_CHUNK_ID)
1466 /* First check we're tall enough (ie enough topLevel) */
1468 x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1469 requiredTallness = 0;
1471 x >>= YAFFS_TNODES_INTERNAL_BITS;
1476 if (requiredTallness > fStruct->topLevel) {
1477 /* Not tall enough, gotta make the tree taller */
1478 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1480 tn = yaffs_GetTnode(dev);
1483 tn->internal[0] = fStruct->top;
1486 T(YAFFS_TRACE_ERROR,
1487 (TSTR("yaffs: no more tnodes" TENDSTR)));
1491 fStruct->topLevel = requiredTallness;
1494 /* Traverse down to level 0, adding anything we need */
1496 l = fStruct->topLevel;
1500 while (l > 0 && tn) {
1502 (YAFFS_TNODES_LEVEL0_BITS +
1503 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1504 YAFFS_TNODES_INTERNAL_MASK;
1507 if ((l > 1) && !tn->internal[x]) {
1508 /* Add missing non-level-zero tnode */
1509 tn->internal[x] = yaffs_GetTnode(dev);
1511 } else if (l == 1) {
1512 /* Looking from level 1 at level 0 */
1514 /* If we already have one, then release it.*/
1515 if (tn->internal[x])
1516 yaffs_FreeTnode(dev, tn->internal[x]);
1517 tn->internal[x] = passedTn;
1519 } else if (!tn->internal[x]) {
1520 /* Don't have one, none passed in */
1521 tn->internal[x] = yaffs_GetTnode(dev);
1525 tn = tn->internal[x];
1529 /* top is level 0 */
1531 memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1532 yaffs_FreeTnode(dev, passedTn);
1539 static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
1540 yaffs_ExtendedTags *tags, int objectId,
1545 for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1546 if (yaffs_CheckChunkBit(dev, theChunk / dev->nChunksPerBlock,
1547 theChunk % dev->nChunksPerBlock)) {
1549 if(dev->chunkGroupSize == 1)
1552 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1554 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1566 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1567 * chunks and tnodes in the file
1568 * Returns 1 if the tree was deleted.
1569 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1572 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
1573 int chunkOffset, int *limit)
1578 yaffs_ExtendedTags tags;
1580 yaffs_Device *dev = in->myDev;
1586 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1588 if (tn->internal[i]) {
1589 if (limit && (*limit) < 0) {
1593 yaffs_DeleteWorker(in,
1601 YAFFS_TNODES_INTERNAL_BITS)
1606 yaffs_FreeTnode(dev,
1609 tn->internal[i] = NULL;
1613 return (allDone) ? 1 : 0;
1614 } else if (level == 0) {
1617 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1619 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1622 chunkInInode = (chunkOffset <<
1623 YAFFS_TNODES_LEVEL0_BITS) + i;
1626 yaffs_FindChunkInGroup(dev,
1632 if (foundChunk > 0) {
1633 yaffs_DeleteChunk(dev,
1638 *limit = *limit - 1;
1645 yaffs_PutLevel0Tnode(dev, tn, i, 0);
1649 return (i < 0) ? 1 : 0;
1659 static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
1661 yaffs_BlockInfo *theBlock;
1663 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1665 theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1667 theBlock->softDeletions++;
1672 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1673 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1675 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1678 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
1679 __u32 level, int chunkOffset)
1684 yaffs_Device *dev = in->myDev;
1689 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1691 if (tn->internal[i]) {
1693 yaffs_SoftDeleteWorker(in,
1699 YAFFS_TNODES_INTERNAL_BITS)
1702 yaffs_FreeTnode(dev,
1705 tn->internal[i] = NULL;
1707 /* Hoosterman... how could this happen? */
1711 return (allDone) ? 1 : 0;
1712 } else if (level == 0) {
1714 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1715 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1717 /* Note this does not find the real chunk, only the chunk group.
1718 * We make an assumption that a chunk group is not larger than
1721 yaffs_SoftDeleteChunk(dev, theChunk);
1722 yaffs_PutLevel0Tnode(dev, tn, i, 0);
1736 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1739 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1740 if (obj->nDataChunks <= 0) {
1741 /* Empty file with no duplicate object headers, just delete it immediately */
1742 yaffs_FreeTnode(obj->myDev,
1743 obj->variant.fileVariant.top);
1744 obj->variant.fileVariant.top = NULL;
1745 T(YAFFS_TRACE_TRACING,
1746 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1748 yaffs_DoGenericObjectDeletion(obj);
1750 yaffs_SoftDeleteWorker(obj,
1751 obj->variant.fileVariant.top,
1752 obj->variant.fileVariant.
1754 obj->softDeleted = 1;
1759 /* Pruning removes any part of the file structure tree that is beyond the
1760 * bounds of the file (ie that does not point to chunks).
1762 * A file should only get pruned when its size is reduced.
1764 * Before pruning, the chunks must be pulled from the tree and the
1765 * level 0 tnode entries must be zeroed out.
1766 * Could also use this for file deletion, but that's probably better handled
1767 * by a special case.
1770 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
1771 __u32 level, int del0)
1779 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1780 if (tn->internal[i] && level > 0) {
1782 yaffs_PruneWorker(dev, tn->internal[i],
1784 (i == 0) ? del0 : 1);
1787 if (tn->internal[i])
1791 if (hasData == 0 && del0) {
1792 /* Free and return NULL */
1794 yaffs_FreeTnode(dev, tn);
1804 static int yaffs_PruneFileStructure(yaffs_Device *dev,
1805 yaffs_FileStructure *fStruct)
1812 if (fStruct->topLevel > 0) {
1814 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1816 /* Now we have a tree with all the non-zero branches NULL but the height
1817 * is the same as it was.
1818 * Let's see if we can trim internal tnodes to shorten the tree.
1819 * We can do this if only the 0th element in the tnode is in use
1820 * (ie all the non-zero are NULL)
1823 while (fStruct->topLevel && !done) {
1827 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1828 if (tn->internal[i])
1833 fStruct->top = tn->internal[0];
1834 fStruct->topLevel--;
1835 yaffs_FreeTnode(dev, tn);
1845 /*-------------------- End of File Structure functions.-------------------*/
1847 /* yaffs_CreateFreeObjects creates a bunch more objects and
1848 * adds them to the object free list.
1850 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
1853 yaffs_Object *newObjects;
1854 yaffs_ObjectList *list;
1859 /* make these things */
1860 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1861 list = YMALLOC(sizeof(yaffs_ObjectList));
1863 if (!newObjects || !list) {
1868 T(YAFFS_TRACE_ALLOCATE,
1869 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1873 /* Hook them into the free list */
1874 for (i = 0; i < nObjects - 1; i++) {
1875 newObjects[i].siblings.next =
1876 (struct ylist_head *)(&newObjects[i + 1]);
1879 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1880 dev->freeObjects = newObjects;
1881 dev->nFreeObjects += nObjects;
1882 dev->nObjectsCreated += nObjects;
1884 /* Now add this bunch of Objects to a list for freeing up. */
1886 list->objects = newObjects;
1887 list->next = dev->allocatedObjectList;
1888 dev->allocatedObjectList = list;
1894 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1895 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
1897 yaffs_Object *tn = NULL;
1899 #ifdef VALGRIND_TEST
1900 tn = YMALLOC(sizeof(yaffs_Object));
1902 /* If there are none left make more */
1903 if (!dev->freeObjects)
1904 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1906 if (dev->freeObjects) {
1907 tn = dev->freeObjects;
1909 (yaffs_Object *) (dev->freeObjects->siblings.next);
1910 dev->nFreeObjects--;
1914 /* Now sweeten it up... */
1916 memset(tn, 0, sizeof(yaffs_Object));
1917 tn->beingCreated = 1;
1921 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1922 YINIT_LIST_HEAD(&(tn->hardLinks));
1923 YINIT_LIST_HEAD(&(tn->hashLink));
1924 YINIT_LIST_HEAD(&tn->siblings);
1927 /* Now make the directory sane */
1929 tn->parent = dev->rootDir;
1930 ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
1933 /* Add it to the lost and found directory.
1934 * NB Can't put root or lostNFound in lostNFound so
1935 * check if lostNFound exists first
1937 if (dev->lostNFoundDir)
1938 yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1940 tn->beingCreated = 0;
1943 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1948 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
1953 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1955 obj->fake = 1; /* it is fake so it might have no NAND presence... */
1956 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1957 obj->unlinkAllowed = 0; /* ... or unlink it */
1960 obj->yst_mode = mode;
1962 obj->hdrChunk = 0; /* Not a valid chunk. */
1969 static void yaffs_UnhashObject(yaffs_Object *tn)
1972 yaffs_Device *dev = tn->myDev;
1974 /* If it is still linked into the bucket list, free from the list */
1975 if (!ylist_empty(&tn->hashLink)) {
1976 ylist_del_init(&tn->hashLink);
1977 bucket = yaffs_HashFunction(tn->objectId);
1978 dev->objectBucket[bucket].count--;
1982 /* FreeObject frees up a Object and puts it back on the free list */
1983 static void yaffs_FreeObject(yaffs_Object *tn)
1985 yaffs_Device *dev = tn->myDev;
1988 T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
1993 if (!ylist_empty(&tn->siblings))
1999 /* We're still hooked up to a cached inode.
2000 * Don't delete now, but mark for later deletion
2002 tn->deferedFree = 1;
2007 yaffs_UnhashObject(tn);
2009 #ifdef VALGRIND_TEST
2012 /* Link into the free list. */
2013 tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
2014 dev->freeObjects = tn;
2015 dev->nFreeObjects++;
2017 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2022 void yaffs_HandleDeferedFree(yaffs_Object *obj)
2024 if (obj->deferedFree)
2025 yaffs_FreeObject(obj);
2030 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
2032 /* Free the list of allocated Objects */
2034 yaffs_ObjectList *tmp;
2036 while (dev->allocatedObjectList) {
2037 tmp = dev->allocatedObjectList->next;
2038 YFREE(dev->allocatedObjectList->objects);
2039 YFREE(dev->allocatedObjectList);
2041 dev->allocatedObjectList = tmp;
2044 dev->freeObjects = NULL;
2045 dev->nFreeObjects = 0;
2048 static void yaffs_InitialiseObjects(yaffs_Device *dev)
2052 dev->allocatedObjectList = NULL;
2053 dev->freeObjects = NULL;
2054 dev->nFreeObjects = 0;
2056 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2057 YINIT_LIST_HEAD(&dev->objectBucket[i].list);
2058 dev->objectBucket[i].count = 0;
2062 static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
2067 int lowest = 999999;
2069 /* First let's see if we can find one that's empty. */
2071 for (i = 0; i < 10 && lowest > 0; i++) {
2073 x %= YAFFS_NOBJECT_BUCKETS;
2074 if (dev->objectBucket[x].count < lowest) {
2075 lowest = dev->objectBucket[x].count;
2081 /* If we didn't find an empty list, then try
2082 * looking a bit further for a short one
2085 for (i = 0; i < 10 && lowest > 3; i++) {
2087 x %= YAFFS_NOBJECT_BUCKETS;
2088 if (dev->objectBucket[x].count < lowest) {
2089 lowest = dev->objectBucket[x].count;
2098 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
2100 int bucket = yaffs_FindNiceObjectBucket(dev);
2102 /* Now find an object value that has not already been taken
2103 * by scanning the list.
2107 struct ylist_head *i;
2109 __u32 n = (__u32) bucket;
2111 /* yaffs_CheckObjectHashSanity(); */
2115 n += YAFFS_NOBJECT_BUCKETS;
2116 if (1 || dev->objectBucket[bucket].count > 0) {
2117 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2118 /* If there is already one in the list */
2119 if (i && ylist_entry(i, yaffs_Object,
2120 hashLink)->objectId == n) {
2130 static void yaffs_HashObject(yaffs_Object *in)
2132 int bucket = yaffs_HashFunction(in->objectId);
2133 yaffs_Device *dev = in->myDev;
2135 ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
2136 dev->objectBucket[bucket].count++;
2139 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
2141 int bucket = yaffs_HashFunction(number);
2142 struct ylist_head *i;
2145 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2146 /* Look if it is in the list */
2148 in = ylist_entry(i, yaffs_Object, hashLink);
2149 if (in->objectId == number) {
2151 /* Don't tell the VFS about this one if it is defered free */
2152 if (in->deferedFree)
2164 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
2165 yaffs_ObjectType type)
2167 yaffs_Object *theObject;
2168 yaffs_Tnode *tn = NULL;
2171 number = yaffs_CreateNewObjectNumber(dev);
2173 theObject = yaffs_AllocateEmptyObject(dev);
2177 if (type == YAFFS_OBJECT_TYPE_FILE) {
2178 tn = yaffs_GetTnode(dev);
2180 yaffs_FreeObject(theObject);
2186 theObject->fake = 0;
2187 theObject->renameAllowed = 1;
2188 theObject->unlinkAllowed = 1;
2189 theObject->objectId = number;
2190 yaffs_HashObject(theObject);
2191 theObject->variantType = type;
2192 #ifdef CONFIG_YAFFS_WINCE
2193 yfsd_WinFileTimeNow(theObject->win_atime);
2194 theObject->win_ctime[0] = theObject->win_mtime[0] =
2195 theObject->win_atime[0];
2196 theObject->win_ctime[1] = theObject->win_mtime[1] =
2197 theObject->win_atime[1];
2201 theObject->yst_atime = theObject->yst_mtime =
2202 theObject->yst_ctime = Y_CURRENT_TIME;
2205 case YAFFS_OBJECT_TYPE_FILE:
2206 theObject->variant.fileVariant.fileSize = 0;
2207 theObject->variant.fileVariant.scannedFileSize = 0;
2208 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2209 theObject->variant.fileVariant.topLevel = 0;
2210 theObject->variant.fileVariant.top = tn;
2212 case YAFFS_OBJECT_TYPE_DIRECTORY:
2213 YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2216 case YAFFS_OBJECT_TYPE_SYMLINK:
2217 case YAFFS_OBJECT_TYPE_HARDLINK:
2218 case YAFFS_OBJECT_TYPE_SPECIAL:
2219 /* No action required */
2221 case YAFFS_OBJECT_TYPE_UNKNOWN:
2222 /* todo this should not happen */
2230 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
2232 yaffs_ObjectType type)
2234 yaffs_Object *theObject = NULL;
2237 theObject = yaffs_FindObjectByNumber(dev, number);
2240 theObject = yaffs_CreateNewObject(dev, number, type);
2247 static YCHAR *yaffs_CloneString(const YCHAR *str)
2249 YCHAR *newStr = NULL;
2252 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
2254 yaffs_strcpy(newStr, str);
2262 * Mknod (create) a new object.
2263 * equivalentObject only has meaning for a hard link;
2264 * aliasString only has meaning for a sumlink.
2265 * rdev only has meaning for devices (a subset of special objects)
2268 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2269 yaffs_Object *parent,
2274 yaffs_Object *equivalentObject,
2275 const YCHAR *aliasString, __u32 rdev)
2280 yaffs_Device *dev = parent->myDev;
2282 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2283 if (yaffs_FindObjectByName(parent, name))
2286 in = yaffs_CreateNewObject(dev, -1, type);
2291 if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2292 str = yaffs_CloneString(aliasString);
2294 yaffs_FreeObject(in);
2304 in->variantType = type;
2306 in->yst_mode = mode;
2308 #ifdef CONFIG_YAFFS_WINCE
2309 yfsd_WinFileTimeNow(in->win_atime);
2310 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2311 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2314 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2316 in->yst_rdev = rdev;
2320 in->nDataChunks = 0;
2322 yaffs_SetObjectName(in, name);
2325 yaffs_AddObjectToDirectory(parent, in);
2327 in->myDev = parent->myDev;
2330 case YAFFS_OBJECT_TYPE_SYMLINK:
2331 in->variant.symLinkVariant.alias = str;
2333 case YAFFS_OBJECT_TYPE_HARDLINK:
2334 in->variant.hardLinkVariant.equivalentObject =
2336 in->variant.hardLinkVariant.equivalentObjectId =
2337 equivalentObject->objectId;
2338 ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
2340 case YAFFS_OBJECT_TYPE_FILE:
2341 case YAFFS_OBJECT_TYPE_DIRECTORY:
2342 case YAFFS_OBJECT_TYPE_SPECIAL:
2343 case YAFFS_OBJECT_TYPE_UNKNOWN:
2348 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2349 /* Could not create the object header, fail the creation */
2350 yaffs_DeleteObject(in);
2354 yaffs_UpdateParent(parent);
2360 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
2361 __u32 mode, __u32 uid, __u32 gid)
2363 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2364 uid, gid, NULL, NULL, 0);
2367 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
2368 __u32 mode, __u32 uid, __u32 gid)
2370 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2371 mode, uid, gid, NULL, NULL, 0);
2374 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
2375 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2377 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2378 uid, gid, NULL, NULL, rdev);
2381 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
2382 __u32 mode, __u32 uid, __u32 gid,
2385 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2386 uid, gid, NULL, alias, 0);
2389 /* yaffs_Link returns the object id of the equivalent object.*/
2390 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
2391 yaffs_Object *equivalentObject)
2393 /* Get the real object in case we were fed a hard link as an equivalent object */
2394 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2396 if (yaffs_MknodObject
2397 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2398 equivalentObject, NULL, 0)) {
2399 return equivalentObject;
2406 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
2407 const YCHAR *newName, int force, int shadows)
2412 yaffs_Object *existingTarget;
2415 newDir = obj->parent; /* use the old directory */
2417 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2418 T(YAFFS_TRACE_ALWAYS,
2420 ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
2425 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2426 if (obj->myDev->isYaffs2)
2427 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2429 unlinkOp = (newDir == obj->myDev->unlinkedDir
2430 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2432 deleteOp = (newDir == obj->myDev->deletedDir);
2434 existingTarget = yaffs_FindObjectByName(newDir, newName);
2436 /* If the object is a file going into the unlinked directory,
2437 * then it is OK to just stuff it in since duplicate names are allowed.
2438 * else only proceed if the new name does not exist and if we're putting
2439 * it into a directory.
2446 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2447 yaffs_SetObjectName(obj, newName);
2450 yaffs_AddObjectToDirectory(newDir, obj);
2455 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2456 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
2463 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
2464 yaffs_Object *newDir, const YCHAR *newName)
2466 yaffs_Object *obj = NULL;
2467 yaffs_Object *existingTarget = NULL;
2471 if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2473 if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2476 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2477 /* Special case for case insemsitive systems (eg. WinCE).
2478 * While look-up is case insensitive, the name isn't.
2479 * Therefore we might want to change x.txt to X.txt
2481 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
2485 else if (yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
2489 obj = yaffs_FindObjectByName(oldDir, oldName);
2491 if (obj && obj->renameAllowed) {
2493 /* Now do the handling for an existing target, if there is one */
2495 existingTarget = yaffs_FindObjectByName(newDir, newName);
2496 if (existingTarget &&
2497 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2498 !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
2499 /* There is a target that is a non-empty directory, so we fail */
2500 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
2501 } else if (existingTarget && existingTarget != obj) {
2502 /* Nuke the target first, using shadowing,
2503 * but only if it isn't the same object
2505 yaffs_ChangeObjectName(obj, newDir, newName, force,
2506 existingTarget->objectId);
2507 yaffs_UnlinkObject(existingTarget);
2509 yaffs_UpdateParent(oldDir);
2510 if(newDir != oldDir)
2511 yaffs_UpdateParent(newDir);
2513 return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2518 /*------------------------- Block Management and Page Allocation ----------------*/
2520 static int yaffs_InitialiseBlocks(yaffs_Device *dev)
2522 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2524 dev->blockInfo = NULL;
2525 dev->chunkBits = NULL;
2527 dev->allocationBlock = -1; /* force it to get a new one */
2529 /* If the first allocation strategy fails, thry the alternate one */
2530 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2531 if (!dev->blockInfo) {
2532 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2533 dev->blockInfoAlt = 1;
2535 dev->blockInfoAlt = 0;
2537 if (dev->blockInfo) {
2538 /* Set up dynamic blockinfo stuff. */
2539 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
2540 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2541 if (!dev->chunkBits) {
2542 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2543 dev->chunkBitsAlt = 1;
2545 dev->chunkBitsAlt = 0;
2548 if (dev->blockInfo && dev->chunkBits) {
2549 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2550 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2557 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2559 if (dev->blockInfoAlt && dev->blockInfo)
2560 YFREE_ALT(dev->blockInfo);
2561 else if (dev->blockInfo)
2562 YFREE(dev->blockInfo);
2564 dev->blockInfoAlt = 0;
2566 dev->blockInfo = NULL;
2568 if (dev->chunkBitsAlt && dev->chunkBits)
2569 YFREE_ALT(dev->chunkBits);
2570 else if (dev->chunkBits)
2571 YFREE(dev->chunkBits);
2572 dev->chunkBitsAlt = 0;
2573 dev->chunkBits = NULL;
2576 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
2577 yaffs_BlockInfo *bi)
2584 return 1; /* disqualification only applies to yaffs2. */
2586 if (!bi->hasShrinkHeader)
2587 return 1; /* can gc */
2589 /* Find the oldest dirty sequence number if we don't know it and save it
2590 * so we don't have to keep recomputing it.
2592 if (!dev->oldestDirtySequence) {
2593 seq = dev->sequenceNumber;
2595 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2597 b = yaffs_GetBlockInfo(dev, i);
2598 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2599 (b->pagesInUse - b->softDeletions) <
2600 dev->nChunksPerBlock && b->sequenceNumber < seq) {
2601 seq = b->sequenceNumber;
2604 dev->oldestDirtySequence = seq;
2607 /* Can't do gc of this block if there are any blocks older than this one that have
2610 return (bi->sequenceNumber <= dev->oldestDirtySequence);
2613 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
2614 * for garbage collection.
2617 static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
2620 int b = dev->currentDirtyChecker;
2626 int prioritised = 0;
2627 yaffs_BlockInfo *bi;
2628 int pendingPrioritisedExist = 0;
2630 /* First let's see if we need to grab a prioritised block */
2631 if (dev->hasPendingPrioritisedGCs) {
2632 for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
2634 bi = yaffs_GetBlockInfo(dev, i);
2635 /* yaffs_VerifyBlock(dev,bi,i); */
2637 if (bi->gcPrioritise) {
2638 pendingPrioritisedExist = 1;
2639 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2640 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2641 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2644 aggressive = 1; /* Fool the non-aggressive skip logiv below */
2649 if (!pendingPrioritisedExist) /* None found, so we can clear this */
2650 dev->hasPendingPrioritisedGCs = 0;
2653 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2655 * else (we're doing a leasurely gc), then we only bother to do this if the
2656 * block has only a few pages in use.
2659 dev->nonAggressiveSkip--;
2661 if (!aggressive && (dev->nonAggressiveSkip > 0))
2666 (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2670 dev->internalEndBlock - dev->internalStartBlock + 1;
2673 dev->internalEndBlock - dev->internalStartBlock + 1;
2674 iterations = iterations / 16;
2675 if (iterations > 200)
2679 for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2681 if (b < dev->internalStartBlock || b > dev->internalEndBlock)
2682 b = dev->internalStartBlock;
2684 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2685 T(YAFFS_TRACE_ERROR,
2686 (TSTR("**>> Block %d is not valid" TENDSTR), b));
2690 bi = yaffs_GetBlockInfo(dev, b);
2692 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2693 (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2694 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2696 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2700 dev->currentDirtyChecker = b;
2704 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2705 dev->nChunksPerBlock - pagesInUse, prioritised));
2708 dev->oldestDirtySequence = 0;
2711 dev->nonAggressiveSkip = 4;
2716 static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
2718 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2722 /* If the block is still healthy erase it and mark as clean.
2723 * If the block has had a data failure, then retire it.
2726 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2727 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2728 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2730 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2732 if (!bi->needsRetiring) {
2733 yaffs_InvalidateCheckpoint(dev);
2734 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2736 dev->nErasureFailures++;
2737 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2738 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2743 ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2745 for (i = 0; i < dev->nChunksPerBlock; i++) {
2746 if (!yaffs_CheckChunkErased
2747 (dev, blockNo * dev->nChunksPerBlock + i)) {
2748 T(YAFFS_TRACE_ERROR,
2750 (">>Block %d erasure supposedly OK, but chunk %d not erased"
2751 TENDSTR), blockNo, i));
2757 /* Clean it up... */
2758 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2759 dev->nErasedBlocks++;
2761 bi->softDeletions = 0;
2762 bi->hasShrinkHeader = 0;
2763 bi->skipErasedCheck = 1; /* This is clean, so no need to check */
2764 bi->gcPrioritise = 0;
2765 yaffs_ClearChunkBits(dev, blockNo);
2767 T(YAFFS_TRACE_ERASE,
2768 (TSTR("Erased block %d" TENDSTR), blockNo));
2770 dev->nFreeChunks -= dev->nChunksPerBlock; /* We lost a block of free space */
2772 yaffs_RetireBlock(dev, blockNo);
2773 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2774 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2778 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2782 yaffs_BlockInfo *bi;
2784 if (dev->nErasedBlocks < 1) {
2785 /* Hoosterman we've got a problem.
2786 * Can't get space to gc
2788 T(YAFFS_TRACE_ERROR,
2789 (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
2794 /* Find an empty block. */
2796 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2797 dev->allocationBlockFinder++;
2798 if (dev->allocationBlockFinder < dev->internalStartBlock
2799 || dev->allocationBlockFinder > dev->internalEndBlock) {
2800 dev->allocationBlockFinder = dev->internalStartBlock;
2803 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2805 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2806 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2807 dev->sequenceNumber++;
2808 bi->sequenceNumber = dev->sequenceNumber;
2809 dev->nErasedBlocks--;
2810 T(YAFFS_TRACE_ALLOCATE,
2811 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
2812 dev->allocationBlockFinder, dev->sequenceNumber,
2813 dev->nErasedBlocks));
2814 return dev->allocationBlockFinder;
2818 T(YAFFS_TRACE_ALWAYS,
2820 ("yaffs tragedy: no more erased blocks, but there should have been %d"
2821 TENDSTR), dev->nErasedBlocks));
2828 static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
2830 if (!dev->nCheckpointBlocksRequired &&
2832 /* Not a valid value so recalculate */
2835 int devBlocks = (dev->endBlock - dev->startBlock + 1);
2838 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
2840 if (tnodeSize < sizeof(yaffs_Tnode))
2841 tnodeSize = sizeof(yaffs_Tnode);
2843 nBytes += sizeof(yaffs_CheckpointValidity);
2844 nBytes += sizeof(yaffs_CheckpointDevice);
2845 nBytes += devBlocks * sizeof(yaffs_BlockInfo);
2846 nBytes += devBlocks * dev->chunkBitmapStride;
2847 nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
2848 nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
2849 nBytes += sizeof(yaffs_CheckpointValidity);
2850 nBytes += sizeof(__u32); /* checksum*/
2852 /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
2854 nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->nChunksPerBlock)) + 3;
2856 dev->nCheckpointBlocksRequired = nBlocks;
2859 return dev->nCheckpointBlocksRequired;
2863 * Check if there's space to allocate...
2864 * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2866 static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev)
2869 int reservedBlocks = dev->nReservedBlocks;
2870 int checkpointBlocks;
2872 if (dev->isYaffs2) {
2873 checkpointBlocks = yaffs_CalcCheckpointBlocksRequired(dev) -
2874 dev->blocksInCheckpoint;
2875 if (checkpointBlocks < 0)
2876 checkpointBlocks = 0;
2878 checkpointBlocks = 0;
2881 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
2883 return (dev->nFreeChunks > reservedChunks);
2886 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
2887 yaffs_BlockInfo **blockUsedPtr)
2890 yaffs_BlockInfo *bi;
2892 if (dev->allocationBlock < 0) {
2893 /* Get next block to allocate off */
2894 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2895 dev->allocationPage = 0;
2898 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2899 /* Not enough space to allocate unless we're allowed to use the reserve. */
2903 if (dev->nErasedBlocks < dev->nReservedBlocks
2904 && dev->allocationPage == 0) {
2905 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2908 /* Next page please.... */
2909 if (dev->allocationBlock >= 0) {
2910 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2912 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2913 dev->allocationPage;
2915 yaffs_SetChunkBit(dev, dev->allocationBlock,
2916 dev->allocationPage);
2918 dev->allocationPage++;
2922 /* If the block is full set the state to full */
2923 if (dev->allocationPage >= dev->nChunksPerBlock) {
2924 bi->blockState = YAFFS_BLOCK_STATE_FULL;
2925 dev->allocationBlock = -1;
2934 T(YAFFS_TRACE_ERROR,
2935 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2940 static int yaffs_GetErasedChunks(yaffs_Device *dev)
2944 n = dev->nErasedBlocks * dev->nChunksPerBlock;
2946 if (dev->allocationBlock > 0)
2947 n += (dev->nChunksPerBlock - dev->allocationPage);
2953 static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
2959 int retVal = YAFFS_OK;
2962 int isCheckpointBlock;
2966 int chunksBefore = yaffs_GetErasedChunks(dev);
2969 yaffs_ExtendedTags tags;
2971 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2973 yaffs_Object *object;
2975 isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
2978 T(YAFFS_TRACE_TRACING,
2979 (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
2982 bi->hasShrinkHeader,
2985 /*yaffs_VerifyFreeChunks(dev); */
2987 if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
2988 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2990 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
2992 /* Take off the number of soft deleted entries because
2993 * they're going to get really deleted during GC.
2995 if(dev->gcChunk == 0) /* first time through for this block */
2996 dev->nFreeChunks -= bi->softDeletions;
3000 if (isCheckpointBlock ||
3001 !yaffs_StillSomeChunkBits(dev, block)) {
3002 T(YAFFS_TRACE_TRACING,
3004 ("Collecting block %d that has no chunks in use" TENDSTR),
3006 yaffs_BlockBecameDirty(dev, block);
3009 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
3011 yaffs_VerifyBlock(dev, bi, block);
3013 maxCopies = (wholeBlock) ? dev->nChunksPerBlock : 10;
3014 oldChunk = block * dev->nChunksPerBlock + dev->gcChunk;
3016 for (/* init already done */;
3017 retVal == YAFFS_OK &&
3018 dev->gcChunk < dev->nChunksPerBlock &&
3019 (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
3021 dev->gcChunk++, oldChunk++) {
3022 if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
3024 /* This page is in use and might need to be copied off */
3030 yaffs_InitialiseTags(&tags);
3032 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
3036 yaffs_FindObjectByNumber(dev,
3039 T(YAFFS_TRACE_GC_DETAIL,
3041 ("Collecting chunk in block %d, %d %d %d " TENDSTR),
3042 dev->gcChunk, tags.objectId, tags.chunkId,
3045 if (object && !yaffs_SkipVerification(dev)) {
3046 if (tags.chunkId == 0)
3047 matchingChunk = object->hdrChunk;
3048 else if (object->softDeleted)
3049 matchingChunk = oldChunk; /* Defeat the test */
3051 matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
3053 if (oldChunk != matchingChunk)
3054 T(YAFFS_TRACE_ERROR,
3055 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
3056 oldChunk, matchingChunk, tags.objectId, tags.chunkId));
3061 T(YAFFS_TRACE_ERROR,
3063 ("page %d in gc has no object: %d %d %d "
3065 tags.objectId, tags.chunkId, tags.byteCount));
3070 object->softDeleted &&
3071 tags.chunkId != 0) {
3072 /* Data chunk in a soft deleted file, throw it away
3073 * It's a soft deleted data chunk,
3074 * No need to copy this, just forget about it and
3075 * fix up the object.
3078 object->nDataChunks--;
3080 if (object->nDataChunks <= 0) {
3081 /* remeber to clean up the object */
3082 dev->gcCleanupList[cleanups] =
3088 /* Todo object && object->deleted && object->nDataChunks == 0 */
3089 /* Deleted object header with no data chunks.
3090 * Can be discarded and the file deleted.
3092 object->hdrChunk = 0;
3093 yaffs_FreeTnode(object->myDev,
3096 object->variant.fileVariant.top = NULL;
3097 yaffs_DoGenericObjectDeletion(object);
3099 } else if (object) {
3100 /* It's either a data chunk in a live file or
3101 * an ObjectHeader, so we're interested in it.
3102 * NB Need to keep the ObjectHeaders of deleted files
3103 * until the whole file has been deleted off
3105 tags.serialNumber++;
3109 if (tags.chunkId == 0) {
3110 /* It is an object Id,
3111 * We need to nuke the shrinkheader flags first
3112 * We no longer want the shrinkHeader flag since its work is done
3113 * and if it is left in place it will mess up scanning.
3116 yaffs_ObjectHeader *oh;
3117 oh = (yaffs_ObjectHeader *)buffer;
3119 tags.extraIsShrinkHeader = 0;
3121 yaffs_VerifyObjectHeader(object, oh, &tags, 1);
3125 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3128 retVal = YAFFS_FAIL;
3131 /* Ok, now fix up the Tnodes etc. */
3133 if (tags.chunkId == 0) {
3135 object->hdrChunk = newChunk;
3136 object->serial = tags.serialNumber;
3138 /* It's a data chunk */
3139 yaffs_PutChunkIntoFile
3147 if (retVal == YAFFS_OK)
3148 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3153 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3156 /* Do any required cleanups */
3157 for (i = 0; i < cleanups; i++) {
3158 /* Time to delete the file too */
3160 yaffs_FindObjectByNumber(dev,
3161 dev->gcCleanupList[i]);
3163 yaffs_FreeTnode(dev,
3164 object->variant.fileVariant.
3166 object->variant.fileVariant.top = NULL;
3169 ("yaffs: About to finally delete object %d"
3170 TENDSTR), object->objectId));
3171 yaffs_DoGenericObjectDeletion(object);
3172 object->myDev->nDeletedFiles--;
3179 yaffs_VerifyCollectedBlock(dev, bi, block);
3181 chunksAfter = yaffs_GetErasedChunks(dev);
3182 if (chunksBefore >= chunksAfter) {
3185 ("gc did not increase free chunks before %d after %d"
3186 TENDSTR), chunksBefore, chunksAfter));
3189 /* If the gc completed then clear the current gcBlock so that we find another. */
3190 if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
3200 /* New garbage collector
3201 * If we're very low on erased blocks then we do aggressive garbage collection
3202 * otherwise we do "leasurely" garbage collection.
3203 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3204 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3206 * The idea is to help clear out space in a more spread-out manner.
3207 * Dunno if it really does anything useful.
3209 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
3213 int gcOk = YAFFS_OK;
3216 int checkpointBlockAdjust;
3218 if (dev->isDoingGC) {
3219 /* Bail out so we don't get recursive gc */
3223 /* This loop should pass the first time.
3224 * We'll only see looping here if the erase of the collected block fails.
3230 checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
3231 if (checkpointBlockAdjust < 0)
3232 checkpointBlockAdjust = 0;
3234 if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
3235 /* We need a block soon...*/
3238 /* We're in no hurry */
3242 if (dev->gcBlock <= 0) {
3243 dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3247 block = dev->gcBlock;
3250 dev->garbageCollections++;
3252 dev->passiveGarbageCollections++;
3256 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3257 dev->nErasedBlocks, aggressive));
3259 gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
3262 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
3265 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3266 TENDSTR), dev->nErasedBlocks, maxTries, block));
3268 } while ((dev->nErasedBlocks < dev->nReservedBlocks) &&
3272 return aggressive ? gcOk : YAFFS_OK;
3275 /*------------------------- TAGS --------------------------------*/
3277 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
3280 return (tags->chunkId == chunkInObject &&
3281 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3286 /*-------------------- Data file manipulation -----------------*/
3288 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
3289 yaffs_ExtendedTags *tags)
3291 /*Get the Tnode, then get the level 0 offset chunk offset */
3294 yaffs_ExtendedTags localTags;
3297 yaffs_Device *dev = in->myDev;
3300 /* Passed a NULL, so use our own tags space */
3304 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3307 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3310 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3316 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
3317 yaffs_ExtendedTags *tags)
3319 /* Get the Tnode, then get the level 0 offset chunk offset */
3322 yaffs_ExtendedTags localTags;
3324 yaffs_Device *dev = in->myDev;
3328 /* Passed a NULL, so use our own tags space */
3332 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3336 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3339 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3342 /* Delete the entry in the filestructure (if found) */
3344 yaffs_PutLevel0Tnode(dev, tn, chunkInInode, 0);
3350 #ifdef YAFFS_PARANOID
3352 static int yaffs_CheckFileSanity(yaffs_Object *in)
3360 yaffs_Tags localTags;
3361 yaffs_Tags *tags = &localTags;
3365 if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
3368 objId = in->objectId;
3369 fSize = in->variant.fileVariant.fileSize;
3371 (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3373 for (chunk = 1; chunk <= nChunks; chunk++) {
3374 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3379 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
3381 if (yaffs_CheckChunkBits
3382 (dev, theChunk / dev->nChunksPerBlock,
3383 theChunk % dev->nChunksPerBlock)) {
3385 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3389 (tags, in->objectId, chunk, chunkDeleted)) {
3399 /* T(("No level 0 found for %d\n", chunk)); */
3403 return failed ? YAFFS_FAIL : YAFFS_OK;
3408 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
3409 int chunkInNAND, int inScan)
3411 /* NB inScan is zero unless scanning.
3412 * For forward scanning, inScan is > 0;
3413 * for backward scanning inScan is < 0
3417 yaffs_Device *dev = in->myDev;
3419 yaffs_ExtendedTags existingTags;
3420 yaffs_ExtendedTags newTags;
3421 unsigned existingSerial, newSerial;
3423 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3424 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3425 * If it is not during Scanning then something went wrong!
3428 T(YAFFS_TRACE_ERROR,
3430 ("yaffs tragedy:attempt to put data chunk into a non-file"
3435 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3439 tn = yaffs_AddOrFindLevel0Tnode(dev,
3440 &in->variant.fileVariant,
3446 existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3449 /* If we're scanning then we need to test for duplicates
3450 * NB This does not need to be efficient since it should only ever
3451 * happen when the power fails during a write, then only one
3452 * chunk should ever be affected.
3454 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3455 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3458 if (existingChunk > 0) {
3459 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3460 * thus we have to do a FindChunkInFile to get the real chunk id.
3462 * We have a duplicate now we need to decide which one to use:
3464 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3465 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3466 * YAFFS1: Get both sets of tags and compare serial numbers.
3470 /* Only do this for forward scanning */
3471 yaffs_ReadChunkWithTagsFromNAND(dev,
3475 /* Do a proper find */
3477 yaffs_FindChunkInFile(in, chunkInInode,
3481 if (existingChunk <= 0) {
3482 /*Hoosterman - how did this happen? */
3484 T(YAFFS_TRACE_ERROR,
3486 ("yaffs tragedy: existing chunk < 0 in scan"
3491 /* NB The deleted flags should be false, otherwise the chunks will
3492 * not be loaded during a scan
3496 newSerial = newTags.serialNumber;
3497 existingSerial = existingTags.serialNumber;
3501 (in->myDev->isYaffs2 ||
3502 existingChunk <= 0 ||
3503 ((existingSerial + 1) & 3) == newSerial)) {
3504 /* Forward scanning.
3506 * Delete the old one and drop through to update the tnode
3508 yaffs_DeleteChunk(dev, existingChunk, 1,
3511 /* Backward scanning or we want to use the existing one
3513 * Delete the new one and return early so that the tnode isn't changed
3515 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3523 if (existingChunk == 0)
3526 yaffs_PutLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
3531 static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
3534 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3536 if (chunkInNAND >= 0)
3537 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3540 T(YAFFS_TRACE_NANDACCESS,
3541 (TSTR("Chunk %d not found zero instead" TENDSTR),
3543 /* get sane (zero) data if you read a hole */
3544 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3550 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
3554 yaffs_ExtendedTags tags;
3555 yaffs_BlockInfo *bi;
3561 block = chunkId / dev->nChunksPerBlock;
3562 page = chunkId % dev->nChunksPerBlock;
3565 if (!yaffs_CheckChunkBit(dev, block, page))
3566 T(YAFFS_TRACE_VERIFY,
3567 (TSTR("Deleting invalid chunk %d"TENDSTR),
3570 bi = yaffs_GetBlockInfo(dev, block);
3572 T(YAFFS_TRACE_DELETION,
3573 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3576 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
3578 yaffs_InitialiseTags(&tags);
3580 tags.chunkDeleted = 1;
3582 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3583 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3585 dev->nUnmarkedDeletions++;
3588 /* Pull out of the management area.
3589 * If the whole block became dirty, this will kick off an erasure.
3591 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3592 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3593 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3594 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3597 yaffs_ClearChunkBit(dev, block, page);
3601 if (bi->pagesInUse == 0 &&
3602 !bi->hasShrinkHeader &&
3603 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3604 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3605 yaffs_BlockBecameDirty(dev, block);
3612 static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
3613 const __u8 *buffer, int nBytes,
3616 /* Find old chunk Need to do this to get serial number
3617 * Write new one and patch into tree.
3618 * Invalidate old tags.
3622 yaffs_ExtendedTags prevTags;
3625 yaffs_ExtendedTags newTags;
3627 yaffs_Device *dev = in->myDev;
3629 yaffs_CheckGarbageCollection(dev);
3631 /* Get the previous chunk at this location in the file if it exists */
3632 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3634 /* Set up new tags */
3635 yaffs_InitialiseTags(&newTags);
3637 newTags.chunkId = chunkInInode;
3638 newTags.objectId = in->objectId;
3639 newTags.serialNumber =
3640 (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
3641 newTags.byteCount = nBytes;
3643 if (nBytes < 1 || nBytes > dev->totalBytesPerChunk) {
3644 T(YAFFS_TRACE_ERROR,
3645 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
3650 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3653 if (newChunkId >= 0) {
3654 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3656 if (prevChunkId > 0)
3657 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3659 yaffs_CheckFileSanity(in);
3665 /* UpdateObjectHeader updates the header on NAND for an object.
3666 * If name is not NULL, then that new name is used.
3668 int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
3669 int isShrink, int shadows)
3672 yaffs_BlockInfo *bi;
3674 yaffs_Device *dev = in->myDev;
3681 yaffs_ExtendedTags newTags;
3682 yaffs_ExtendedTags oldTags;
3684 __u8 *buffer = NULL;
3685 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3687 yaffs_ObjectHeader *oh = NULL;
3689 yaffs_strcpy(oldName, _Y("silly old name"));
3693 in == dev->rootDir || /* The rootDir should also be saved */
3696 yaffs_CheckGarbageCollection(dev);
3697 yaffs_CheckObjectDetailsLoaded(in);
3699 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3700 oh = (yaffs_ObjectHeader *) buffer;
3702 prevChunkId = in->hdrChunk;
3704 if (prevChunkId > 0) {
3705 result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3708 yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
3710 memcpy(oldName, oh->name, sizeof(oh->name));
3713 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3715 oh->type = in->variantType;
3716 oh->yst_mode = in->yst_mode;
3717 oh->shadowsObject = oh->inbandShadowsObject = shadows;
3719 #ifdef CONFIG_YAFFS_WINCE
3720 oh->win_atime[0] = in->win_atime[0];
3721 oh->win_ctime[0] = in->win_ctime[0];
3722 oh->win_mtime[0] = in->win_mtime[0];
3723 oh->win_atime[1] = in->win_atime[1];
3724 oh->win_ctime[1] = in->win_ctime[1];
3725 oh->win_mtime[1] = in->win_mtime[1];
3727 oh->yst_uid = in->yst_uid;
3728 oh->yst_gid = in->yst_gid;
3729 oh->yst_atime = in->yst_atime;
3730 oh->yst_mtime = in->yst_mtime;
3731 oh->yst_ctime = in->yst_ctime;
3732 oh->yst_rdev = in->yst_rdev;
3735 oh->parentObjectId = in->parent->objectId;
3737 oh->parentObjectId = 0;
3739 if (name && *name) {
3740 memset(oh->name, 0, sizeof(oh->name));
3741 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3742 } else if (prevChunkId > 0)
3743 memcpy(oh->name, oldName, sizeof(oh->name));
3745 memset(oh->name, 0, sizeof(oh->name));
3747 oh->isShrink = isShrink;
3749 switch (in->variantType) {
3750 case YAFFS_OBJECT_TYPE_UNKNOWN:
3751 /* Should not happen */
3753 case YAFFS_OBJECT_TYPE_FILE:
3755 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3756 || oh->parentObjectId ==
3757 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3758 fileVariant.fileSize;
3760 case YAFFS_OBJECT_TYPE_HARDLINK:
3761 oh->equivalentObjectId =
3762 in->variant.hardLinkVariant.equivalentObjectId;
3764 case YAFFS_OBJECT_TYPE_SPECIAL:
3767 case YAFFS_OBJECT_TYPE_DIRECTORY:
3770 case YAFFS_OBJECT_TYPE_SYMLINK:
3771 yaffs_strncpy(oh->alias,
3772 in->variant.symLinkVariant.alias,
3773 YAFFS_MAX_ALIAS_LENGTH);
3774 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3779 yaffs_InitialiseTags(&newTags);
3781 newTags.chunkId = 0;
3782 newTags.objectId = in->objectId;
3783 newTags.serialNumber = in->serial;
3785 /* Add extra info for file header */
3787 newTags.extraHeaderInfoAvailable = 1;
3788 newTags.extraParentObjectId = oh->parentObjectId;
3789 newTags.extraFileLength = oh->fileSize;
3790 newTags.extraIsShrinkHeader = oh->isShrink;
3791 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3792 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3793 newTags.extraObjectType = in->variantType;
3795 yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
3797 /* Create new chunk in NAND */
3799 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3800 (prevChunkId > 0) ? 1 : 0);
3802 if (newChunkId >= 0) {
3804 in->hdrChunk = newChunkId;
3806 if (prevChunkId > 0) {
3807 yaffs_DeleteChunk(dev, prevChunkId, 1,
3811 if (!yaffs_ObjectHasCachedWriteData(in))
3814 /* If this was a shrink, then mark the block that the chunk lives on */
3816 bi = yaffs_GetBlockInfo(in->myDev,
3817 newChunkId / in->myDev->nChunksPerBlock);
3818 bi->hasShrinkHeader = 1;
3823 retVal = newChunkId;
3828 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3833 /*------------------------ Short Operations Cache ----------------------------------------
3834 * In many situations where there is no high level buffering (eg WinCE) a lot of
3835 * reads might be short sequential reads, and a lot of writes may be short
3836 * sequential writes. eg. scanning/writing a jpeg file.
3837 * In these cases, a short read/write cache can provide a huge perfomance benefit
3838 * with dumb-as-a-rock code.
3839 * In Linux, the page cache provides read buffering aand the short op cache provides write
3842 * There are a limited number (~10) of cache chunks per device so that we don't
3843 * need a very intelligent search.
3846 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3848 yaffs_Device *dev = obj->myDev;
3850 yaffs_ChunkCache *cache;
3851 int nCaches = obj->myDev->nShortOpCaches;
3853 for (i = 0; i < nCaches; i++) {
3854 cache = &dev->srCache[i];
3855 if (cache->object == obj &&
3864 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
3866 yaffs_Device *dev = obj->myDev;
3867 int lowest = -99; /* Stop compiler whining. */
3869 yaffs_ChunkCache *cache;
3870 int chunkWritten = 0;
3871 int nCaches = obj->myDev->nShortOpCaches;
3877 /* Find the dirty cache for this object with the lowest chunk id. */
3878 for (i = 0; i < nCaches; i++) {
3879 if (dev->srCache[i].object == obj &&
3880 dev->srCache[i].dirty) {
3882 || dev->srCache[i].chunkId <
3884 cache = &dev->srCache[i];
3885 lowest = cache->chunkId;
3890 if (cache && !cache->locked) {
3891 /* Write it out and free it up */
3894 yaffs_WriteChunkDataToObject(cache->object,
3900 cache->object = NULL;
3903 } while (cache && chunkWritten > 0);
3906 /* Hoosterman, disk full while writing cache out. */
3907 T(YAFFS_TRACE_ERROR,
3908 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3915 /*yaffs_FlushEntireDeviceCache(dev)
3920 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
3923 int nCaches = dev->nShortOpCaches;
3926 /* Find a dirty object in the cache and flush it...
3927 * until there are no further dirty objects.
3931 for (i = 0; i < nCaches && !obj; i++) {
3932 if (dev->srCache[i].object &&
3933 dev->srCache[i].dirty)
3934 obj = dev->srCache[i].object;
3938 yaffs_FlushFilesChunkCache(obj);
3945 /* Grab us a cache chunk for use.
3946 * First look for an empty one.
3947 * Then look for the least recently used non-dirty one.
3948 * Then look for the least recently used dirty one...., flush and look again.
3950 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
3954 if (dev->nShortOpCaches > 0) {
3955 for (i = 0; i < dev->nShortOpCaches; i++) {
3956 if (!dev->srCache[i].object)
3957 return &dev->srCache[i];
3964 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
3966 yaffs_ChunkCache *cache;
3967 yaffs_Object *theObj;
3972 if (dev->nShortOpCaches > 0) {
3973 /* Try find a non-dirty one... */
3975 cache = yaffs_GrabChunkCacheWorker(dev);
3978 /* They were all dirty, find the last recently used object and flush
3979 * its cache, then find again.
3980 * NB what's here is not very accurate, we actually flush the object
3981 * the last recently used page.
3984 /* With locking we can't assume we can use entry zero */
3991 for (i = 0; i < dev->nShortOpCaches; i++) {
3992 if (dev->srCache[i].object &&
3993 !dev->srCache[i].locked &&
3994 (dev->srCache[i].lastUse < usage || !cache)) {
3995 usage = dev->srCache[i].lastUse;
3996 theObj = dev->srCache[i].object;
3997 cache = &dev->srCache[i];
4002 if (!cache || cache->dirty) {
4003 /* Flush and try again */
4004 yaffs_FlushFilesChunkCache(theObj);
4005 cache = yaffs_GrabChunkCacheWorker(dev);
4015 /* Find a cached chunk */
4016 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
4019 yaffs_Device *dev = obj->myDev;
4021 if (dev->nShortOpCaches > 0) {
4022 for (i = 0; i < dev->nShortOpCaches; i++) {
4023 if (dev->srCache[i].object == obj &&
4024 dev->srCache[i].chunkId == chunkId) {
4027 return &dev->srCache[i];
4034 /* Mark the chunk for the least recently used algorithym */
4035 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
4039 if (dev->nShortOpCaches > 0) {
4040 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
4041 /* Reset the cache usages */
4043 for (i = 1; i < dev->nShortOpCaches; i++)
4044 dev->srCache[i].lastUse = 0;
4051 cache->lastUse = dev->srLastUse;
4058 /* Invalidate a single cache page.
4059 * Do this when a whole page gets written,
4060 * ie the short cache for this page is no longer valid.
4062 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
4064 if (object->myDev->nShortOpCaches > 0) {
4065 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4068 cache->object = NULL;
4072 /* Invalidate all the cache pages associated with this object
4073 * Do this whenever ther file is deleted or resized.
4075 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
4078 yaffs_Device *dev = in->myDev;
4080 if (dev->nShortOpCaches > 0) {
4081 /* Invalidate it. */
4082 for (i = 0; i < dev->nShortOpCaches; i++) {
4083 if (dev->srCache[i].object == in)
4084 dev->srCache[i].object = NULL;
4089 /*--------------------- Checkpointing --------------------*/
4092 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
4094 yaffs_CheckpointValidity cp;
4096 memset(&cp, 0, sizeof(cp));
4098 cp.structType = sizeof(cp);
4099 cp.magic = YAFFS_MAGIC;
4100 cp.version = YAFFS_CHECKPOINT_VERSION;
4101 cp.head = (head) ? 1 : 0;
4103 return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
4107 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4109 yaffs_CheckpointValidity cp;
4112 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4115 ok = (cp.structType == sizeof(cp)) &&
4116 (cp.magic == YAFFS_MAGIC) &&
4117 (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4118 (cp.head == ((head) ? 1 : 0));
4122 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4125 cp->nErasedBlocks = dev->nErasedBlocks;
4126 cp->allocationBlock = dev->allocationBlock;
4127 cp->allocationPage = dev->allocationPage;
4128 cp->nFreeChunks = dev->nFreeChunks;
4130 cp->nDeletedFiles = dev->nDeletedFiles;
4131 cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4132 cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4133 cp->sequenceNumber = dev->sequenceNumber;
4134 cp->oldestDirtySequence = dev->oldestDirtySequence;
4138 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4139 yaffs_CheckpointDevice *cp)
4141 dev->nErasedBlocks = cp->nErasedBlocks;
4142 dev->allocationBlock = cp->allocationBlock;
4143 dev->allocationPage = cp->allocationPage;
4144 dev->nFreeChunks = cp->nFreeChunks;
4146 dev->nDeletedFiles = cp->nDeletedFiles;
4147 dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4148 dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4149 dev->sequenceNumber = cp->sequenceNumber;
4150 dev->oldestDirtySequence = cp->oldestDirtySequence;
4154 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4156 yaffs_CheckpointDevice cp;
4158 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4162 /* Write device runtime values*/
4163 yaffs_DeviceToCheckpointDevice(&cp, dev);
4164 cp.structType = sizeof(cp);
4166 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4168 /* Write block info */
4170 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4171 ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
4174 /* Write chunk bits */
4176 nBytes = nBlocks * dev->chunkBitmapStride;
4177 ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
4183 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4185 yaffs_CheckpointDevice cp;
4187 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4191 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4195 if (cp.structType != sizeof(cp))
4199 yaffs_CheckpointDeviceToDevice(dev, &cp);
4201 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4203 ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
4207 nBytes = nBlocks * dev->chunkBitmapStride;
4209 ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
4214 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4218 cp->objectId = obj->objectId;
4219 cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4220 cp->hdrChunk = obj->hdrChunk;
4221 cp->variantType = obj->variantType;
4222 cp->deleted = obj->deleted;
4223 cp->softDeleted = obj->softDeleted;
4224 cp->unlinked = obj->unlinked;
4225 cp->fake = obj->fake;
4226 cp->renameAllowed = obj->renameAllowed;
4227 cp->unlinkAllowed = obj->unlinkAllowed;
4228 cp->serial = obj->serial;
4229 cp->nDataChunks = obj->nDataChunks;
4231 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4232 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4233 else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4234 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4237 static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
4240 yaffs_Object *parent;
4242 if (obj->variantType != cp->variantType) {
4243 T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
4244 TCONT("chunk %d does not match existing object type %d")
4245 TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
4250 obj->objectId = cp->objectId;
4253 parent = yaffs_FindOrCreateObjectByNumber(
4256 YAFFS_OBJECT_TYPE_DIRECTORY);
4261 if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4262 T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
4263 TCONT(" chunk %d Parent type, %d, not directory")
4265 cp->objectId, cp->parentId, cp->variantType,
4266 cp->hdrChunk, parent->variantType));
4269 yaffs_AddObjectToDirectory(parent, obj);
4272 obj->hdrChunk = cp->hdrChunk;
4273 obj->variantType = cp->variantType;
4274 obj->deleted = cp->deleted;
4275 obj->softDeleted = cp->softDeleted;
4276 obj->unlinked = cp->unlinked;
4277 obj->fake = cp->fake;
4278 obj->renameAllowed = cp->renameAllowed;
4279 obj->unlinkAllowed = cp->unlinkAllowed;
4280 obj->serial = cp->serial;
4281 obj->nDataChunks = cp->nDataChunks;
4283 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4284 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4285 else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4286 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4288 if (obj->hdrChunk > 0)
4289 obj->lazyLoaded = 1;
4295 static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
4296 __u32 level, int chunkOffset)
4299 yaffs_Device *dev = in->myDev;
4301 int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4303 if (tnodeSize < sizeof(yaffs_Tnode))
4304 tnodeSize = sizeof(yaffs_Tnode);
4310 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
4311 if (tn->internal[i]) {
4312 ok = yaffs_CheckpointTnodeWorker(in,
4315 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4318 } else if (level == 0) {
4319 __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
4320 ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
4322 ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
4330 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4332 __u32 endMarker = ~0;
4335 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4336 ok = yaffs_CheckpointTnodeWorker(obj,
4337 obj->variant.fileVariant.top,
4338 obj->variant.fileVariant.topLevel,
4341 ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
4348 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4352 yaffs_Device *dev = obj->myDev;
4353 yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4356 int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4358 if (tnodeSize < sizeof(yaffs_Tnode))
4359 tnodeSize = sizeof(yaffs_Tnode);
4361 ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4363 while (ok && (~baseChunk)) {
4365 /* Read level 0 tnode */
4368 tn = yaffs_GetTnodeRaw(dev);
4370 ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
4375 ok = yaffs_AddOrFindLevel0Tnode(dev,
4381 ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4385 T(YAFFS_TRACE_CHECKPOINT, (
4386 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4387 nread, baseChunk, ok));
4393 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4396 yaffs_CheckpointObject cp;
4399 struct ylist_head *lh;
4402 /* Iterate through the objects in each hash entry,
4403 * dumping them to the checkpointing stream.
4406 for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) {
4407 ylist_for_each(lh, &dev->objectBucket[i].list) {
4409 obj = ylist_entry(lh, yaffs_Object, hashLink);
4410 if (!obj->deferedFree) {
4411 yaffs_ObjectToCheckpointObject(&cp, obj);
4412 cp.structType = sizeof(cp);
4414 T(YAFFS_TRACE_CHECKPOINT, (
4415 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
4416 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, (unsigned) obj));
4418 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4420 if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4421 ok = yaffs_WriteCheckpointTnodes(obj);
4427 /* Dump end of list */
4428 memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
4429 cp.structType = sizeof(cp);
4432 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4437 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4440 yaffs_CheckpointObject cp;
4443 yaffs_Object *hardList = NULL;
4445 while (ok && !done) {
4446 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4447 if (cp.structType != sizeof(cp)) {
4448 T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
4449 cp.structType, sizeof(cp), ok));
4453 T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4454 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
4456 if (ok && cp.objectId == ~0)
4459 obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
4461 ok = yaffs_CheckpointObjectToObject(obj, &cp);
4464 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4465 ok = yaffs_ReadCheckpointTnodes(obj);
4466 } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4467 obj->hardLinks.next =
4468 (struct ylist_head *) hardList;
4477 yaffs_HardlinkFixup(dev, hardList);
4482 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4484 __u32 checkpointSum;
4487 yaffs_GetCheckpointSum(dev, &checkpointSum);
4489 ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
4497 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4499 __u32 checkpointSum0;
4500 __u32 checkpointSum1;
4503 yaffs_GetCheckpointSum(dev, &checkpointSum0);
4505 ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4510 if (checkpointSum0 != checkpointSum1)
4517 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4521 if (dev->skipCheckpointWrite || !dev->isYaffs2) {
4522 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
4527 ok = yaffs_CheckpointOpen(dev, 1);
4530 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4531 ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
4534 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
4535 ok = yaffs_WriteCheckpointDevice(dev);
4538 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
4539 ok = yaffs_WriteCheckpointObjects(dev);
4542 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4543 ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
4547 ok = yaffs_WriteCheckpointSum(dev);
4549 if (!yaffs_CheckpointClose(dev))
4553 dev->isCheckpointed = 1;
4555 dev->isCheckpointed = 0;
4557 return dev->isCheckpointed;
4560 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4564 if (dev->skipCheckpointRead || !dev->isYaffs2) {
4565 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
4570 ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
4573 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4574 ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
4577 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
4578 ok = yaffs_ReadCheckpointDevice(dev);
4581 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
4582 ok = yaffs_ReadCheckpointObjects(dev);
4585 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4586 ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
4590 ok = yaffs_ReadCheckpointSum(dev);
4591 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
4594 if (!yaffs_CheckpointClose(dev))
4598 dev->isCheckpointed = 1;
4600 dev->isCheckpointed = 0;
4606 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4608 if (dev->isCheckpointed ||
4609 dev->blocksInCheckpoint > 0) {
4610 dev->isCheckpointed = 0;
4611 yaffs_CheckpointInvalidateStream(dev);
4612 if (dev->superBlock && dev->markSuperBlockDirty)
4613 dev->markSuperBlockDirty(dev->superBlock);
4618 int yaffs_CheckpointSave(yaffs_Device *dev)
4621 T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4623 yaffs_VerifyObjects(dev);
4624 yaffs_VerifyBlocks(dev);
4625 yaffs_VerifyFreeChunks(dev);
4627 if (!dev->isCheckpointed) {
4628 yaffs_InvalidateCheckpoint(dev);
4629 yaffs_WriteCheckpointData(dev);
4632 T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4634 return dev->isCheckpointed;
4637 int yaffs_CheckpointRestore(yaffs_Device *dev)
4640 T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4642 retval = yaffs_ReadCheckpointData(dev);
4644 if (dev->isCheckpointed) {
4645 yaffs_VerifyObjects(dev);
4646 yaffs_VerifyBlocks(dev);
4647 yaffs_VerifyFreeChunks(dev);
4650 T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4655 /*--------------------- File read/write ------------------------
4656 * Read and write have very similar structures.
4657 * In general the read/write has three parts to it
4658 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4659 * Some complete chunks
4660 * An incomplete chunk to end off with
4662 * Curve-balls: the first chunk might also be the last chunk.
4665 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
4674 yaffs_ChunkCache *cache;
4681 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4682 /* start = offset % dev->nDataBytesPerChunk; */
4683 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4686 /* OK now check for the curveball where the start and end are in
4689 if ((start + n) < dev->nDataBytesPerChunk)
4692 nToCopy = dev->nDataBytesPerChunk - start;
4694 cache = yaffs_FindChunkCache(in, chunk);
4696 /* If the chunk is already in the cache or it is less than a whole chunk
4697 * or we're using inband tags then use the cache (if there is caching)
4698 * else bypass the cache.
4700 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4701 if (dev->nShortOpCaches > 0) {
4703 /* If we can't find the data in the cache, then load it up. */
4706 cache = yaffs_GrabChunkCache(in->myDev);
4708 cache->chunkId = chunk;
4711 yaffs_ReadChunkDataFromObject(in, chunk,
4717 yaffs_UseChunkCache(dev, cache, 0);
4722 memcpy(buffer, &cache->data[start], nToCopy);
4726 /* Read into the local buffer then copy..*/
4729 yaffs_GetTempBuffer(dev, __LINE__);
4730 yaffs_ReadChunkDataFromObject(in, chunk,
4733 memcpy(buffer, &localBuffer[start], nToCopy);
4736 yaffs_ReleaseTempBuffer(dev, localBuffer,
4742 /* A full chunk. Read directly into the supplied buffer. */
4743 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4757 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
4758 int nBytes, int writeThrough)
4767 int startOfWrite = offset;
4768 int chunkWritten = 0;
4776 while (n > 0 && chunkWritten >= 0) {
4777 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4778 /* start = offset % dev->nDataBytesPerChunk; */
4779 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4781 if (chunk * dev->nDataBytesPerChunk + start != offset ||
4782 start >= dev->nDataBytesPerChunk) {
4783 T(YAFFS_TRACE_ERROR, (
4784 TSTR("AddrToChunk of offset %d gives chunk %d start %d"
4786 (int)offset, chunk, start));
4790 /* OK now check for the curveball where the start and end are in
4794 if ((start + n) < dev->nDataBytesPerChunk) {
4797 /* Now folks, to calculate how many bytes to write back....
4798 * If we're overwriting and not writing to then end of file then
4799 * we need to write back as much as was there before.
4802 chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
4804 if (chunkStart > in->variant.fileVariant.fileSize)
4805 nBytesRead = 0; /* Past end of file */
4807 nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
4809 if (nBytesRead > dev->nDataBytesPerChunk)
4810 nBytesRead = dev->nDataBytesPerChunk;
4814 (start + n)) ? nBytesRead : (start + n);
4816 if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
4820 nToCopy = dev->nDataBytesPerChunk - start;
4821 nToWriteBack = dev->nDataBytesPerChunk;
4824 if (nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4825 /* An incomplete start or end chunk (or maybe both start and end chunk),
4826 * or we're using inband tags, so we want to use the cache buffers.
4828 if (dev->nShortOpCaches > 0) {
4829 yaffs_ChunkCache *cache;
4830 /* If we can't find the data in the cache, then load the cache */
4831 cache = yaffs_FindChunkCache(in, chunk);
4834 && yaffs_CheckSpaceForAllocation(in->
4836 cache = yaffs_GrabChunkCache(in->myDev);
4838 cache->chunkId = chunk;
4841 yaffs_ReadChunkDataFromObject(in, chunk,
4846 !yaffs_CheckSpaceForAllocation(in->myDev)) {
4847 /* Drop the cache if it was a read cache item and
4848 * no space check has been made for it.
4854 yaffs_UseChunkCache(dev, cache, 1);
4858 memcpy(&cache->data[start], buffer,
4863 cache->nBytes = nToWriteBack;
4867 yaffs_WriteChunkDataToObject
4870 cache->data, cache->nBytes,
4876 chunkWritten = -1; /* fail the write */
4879 /* An incomplete start or end chunk (or maybe both start and end chunk)
4880 * Read into the local buffer then copy, then copy over and write back.
4884 yaffs_GetTempBuffer(dev, __LINE__);
4886 yaffs_ReadChunkDataFromObject(in, chunk,
4891 memcpy(&localBuffer[start], buffer, nToCopy);
4894 yaffs_WriteChunkDataToObject(in, chunk,
4899 yaffs_ReleaseTempBuffer(dev, localBuffer,
4905 /* A full chunk. Write directly from the supplied buffer. */
4910 yaffs_WriteChunkDataToObject(in, chunk, buffer,
4911 dev->nDataBytesPerChunk,
4914 /* Since we've overwritten the cached data, we better invalidate it. */
4915 yaffs_InvalidateChunkCache(in, chunk);
4918 if (chunkWritten >= 0) {
4927 /* Update file object */
4929 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
4930 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
4938 /* ---------------------- File resizing stuff ------------------ */
4940 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
4943 yaffs_Device *dev = in->myDev;
4944 int oldFileSize = in->variant.fileVariant.fileSize;
4946 int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
4948 int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
4949 dev->nDataBytesPerChunk;
4953 /* Delete backwards so that we don't end up with holes if
4954 * power is lost part-way through the operation.
4956 for (i = lastDel; i >= startDel; i--) {
4957 /* NB this could be optimised somewhat,
4958 * eg. could retrieve the tags and write them without
4959 * using yaffs_DeleteChunk
4962 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
4965 (dev->internalStartBlock * dev->nChunksPerBlock)
4967 ((dev->internalEndBlock +
4968 1) * dev->nChunksPerBlock)) {
4969 T(YAFFS_TRACE_ALWAYS,
4970 (TSTR("Found daft chunkId %d for %d" TENDSTR),
4974 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
4981 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
4984 int oldFileSize = in->variant.fileVariant.fileSize;
4985 __u32 newSizeOfPartialChunk;
4988 yaffs_Device *dev = in->myDev;
4990 yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
4992 yaffs_FlushFilesChunkCache(in);
4993 yaffs_InvalidateWholeChunkCache(in);
4995 yaffs_CheckGarbageCollection(dev);
4997 if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
5000 if (newSize == oldFileSize)
5003 if (newSize < oldFileSize) {
5005 yaffs_PruneResizedChunks(in, newSize);
5007 if (newSizeOfPartialChunk != 0) {
5008 int lastChunk = 1 + newFullChunks;
5010 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
5012 /* Got to read and rewrite the last chunk with its new size and zero pad */
5013 yaffs_ReadChunkDataFromObject(in, lastChunk,
5016 memset(localBuffer + newSizeOfPartialChunk, 0,
5017 dev->nDataBytesPerChunk - newSizeOfPartialChunk);
5019 yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
5020 newSizeOfPartialChunk, 1);
5022 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
5025 in->variant.fileVariant.fileSize = newSize;
5027 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
5029 /* newsSize > oldFileSize */
5030 in->variant.fileVariant.fileSize = newSize;
5034 /* Write a new object header.
5035 * show we've shrunk the file, if need be
5036 * Do this only if the file is not in the deleted directories.
5039 in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5040 in->parent->objectId != YAFFS_OBJECTID_DELETED)
5041 yaffs_UpdateObjectHeader(in, NULL, 0,
5042 (newSize < oldFileSize) ? 1 : 0, 0);
5047 loff_t yaffs_GetFileSize(yaffs_Object *obj)
5049 obj = yaffs_GetEquivalentObject(obj);
5051 switch (obj->variantType) {
5052 case YAFFS_OBJECT_TYPE_FILE:
5053 return obj->variant.fileVariant.fileSize;
5054 case YAFFS_OBJECT_TYPE_SYMLINK:
5055 return yaffs_strlen(obj->variant.symLinkVariant.alias);
5063 int yaffs_FlushFile(yaffs_Object *in, int updateTime)
5067 yaffs_FlushFilesChunkCache(in);
5069 #ifdef CONFIG_YAFFS_WINCE
5070 yfsd_WinFileTimeNow(in->win_mtime);
5073 in->yst_mtime = Y_CURRENT_TIME;
5078 retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5079 0) ? YAFFS_OK : YAFFS_FAIL;
5088 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
5091 /* First off, invalidate the file's data in the cache, without flushing. */
5092 yaffs_InvalidateWholeChunkCache(in);
5094 if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5095 /* Move to the unlinked directory so we have a record that it was deleted. */
5096 yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
5100 yaffs_RemoveObjectFromDirectory(in);
5101 yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
5104 yaffs_FreeObject(in);
5109 /* yaffs_DeleteFile deletes the whole file data
5110 * and the inode associated with the file.
5111 * It does not delete the links associated with the file.
5113 static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
5117 int immediateDeletion = 0;
5121 immediateDeletion = 1;
5124 immediateDeletion = 1;
5127 if (immediateDeletion) {
5129 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5130 _Y("deleted"), 0, 0);
5131 T(YAFFS_TRACE_TRACING,
5132 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5135 in->myDev->nDeletedFiles++;
5136 if (1 || in->myDev->isYaffs2)
5137 yaffs_ResizeFile(in, 0);
5138 yaffs_SoftDeleteFile(in);
5141 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5142 _Y("unlinked"), 0, 0);
5149 int yaffs_DeleteFile(yaffs_Object *in)
5151 int retVal = YAFFS_OK;
5152 int deleted = in->deleted;
5154 yaffs_ResizeFile(in, 0);
5156 if (in->nDataChunks > 0) {
5157 /* Use soft deletion if there is data in the file.
5158 * That won't be the case if it has been resized to zero.
5161 retVal = yaffs_UnlinkFileIfNeeded(in);
5163 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5166 in->myDev->nDeletedFiles++;
5167 yaffs_SoftDeleteFile(in);
5169 return deleted ? YAFFS_OK : YAFFS_FAIL;
5171 /* The file has no data chunks so we toss it immediately */
5172 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5173 in->variant.fileVariant.top = NULL;
5174 yaffs_DoGenericObjectDeletion(in);
5180 static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
5182 return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
5183 !(ylist_empty(&obj->variant.directoryVariant.children));
5186 static int yaffs_DeleteDirectory(yaffs_Object *obj)
5188 /* First check that the directory is empty. */
5189 if (yaffs_IsNonEmptyDirectory(obj))
5192 return yaffs_DoGenericObjectDeletion(obj);
5195 static int yaffs_DeleteSymLink(yaffs_Object *in)
5197 YFREE(in->variant.symLinkVariant.alias);
5199 return yaffs_DoGenericObjectDeletion(in);
5202 static int yaffs_DeleteHardLink(yaffs_Object *in)
5204 /* remove this hardlink from the list assocaited with the equivalent
5207 ylist_del_init(&in->hardLinks);
5208 return yaffs_DoGenericObjectDeletion(in);
5211 int yaffs_DeleteObject(yaffs_Object *obj)
5214 switch (obj->variantType) {
5215 case YAFFS_OBJECT_TYPE_FILE:
5216 retVal = yaffs_DeleteFile(obj);
5218 case YAFFS_OBJECT_TYPE_DIRECTORY:
5219 return yaffs_DeleteDirectory(obj);
5221 case YAFFS_OBJECT_TYPE_SYMLINK:
5222 retVal = yaffs_DeleteSymLink(obj);
5224 case YAFFS_OBJECT_TYPE_HARDLINK:
5225 retVal = yaffs_DeleteHardLink(obj);
5227 case YAFFS_OBJECT_TYPE_SPECIAL:
5228 retVal = yaffs_DoGenericObjectDeletion(obj);
5230 case YAFFS_OBJECT_TYPE_UNKNOWN:
5232 break; /* should not happen. */
5238 static int yaffs_UnlinkWorker(yaffs_Object *obj)
5241 int immediateDeletion = 0;
5245 immediateDeletion = 1;
5247 if (obj->inUse <= 0)
5248 immediateDeletion = 1;
5252 yaffs_UpdateParent(obj->parent);
5254 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5255 return yaffs_DeleteHardLink(obj);
5256 } else if (!ylist_empty(&obj->hardLinks)) {
5257 /* Curve ball: We're unlinking an object that has a hardlink.
5259 * This problem arises because we are not strictly following
5260 * The Linux link/inode model.
5262 * We can't really delete the object.
5263 * Instead, we do the following:
5264 * - Select a hardlink.
5265 * - Unhook it from the hard links
5266 * - Unhook it from its parent directory (so that the rename can work)
5267 * - Rename the object to the hardlink's name.
5268 * - Delete the hardlink
5273 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5275 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5277 ylist_del_init(&hl->hardLinks);
5278 ylist_del_init(&hl->siblings);
5280 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5282 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
5284 if (retVal == YAFFS_OK)
5285 retVal = yaffs_DoGenericObjectDeletion(hl);
5289 } else if (immediateDeletion) {
5290 switch (obj->variantType) {
5291 case YAFFS_OBJECT_TYPE_FILE:
5292 return yaffs_DeleteFile(obj);
5294 case YAFFS_OBJECT_TYPE_DIRECTORY:
5295 return yaffs_DeleteDirectory(obj);
5297 case YAFFS_OBJECT_TYPE_SYMLINK:
5298 return yaffs_DeleteSymLink(obj);
5300 case YAFFS_OBJECT_TYPE_SPECIAL:
5301 return yaffs_DoGenericObjectDeletion(obj);
5303 case YAFFS_OBJECT_TYPE_HARDLINK:
5304 case YAFFS_OBJECT_TYPE_UNKNOWN:
5308 } else if(yaffs_IsNonEmptyDirectory(obj))
5311 return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
5312 _Y("unlinked"), 0, 0);
5316 static int yaffs_UnlinkObject(yaffs_Object *obj)
5319 if (obj && obj->unlinkAllowed)
5320 return yaffs_UnlinkWorker(obj);
5325 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
5329 obj = yaffs_FindObjectByName(dir, name);
5330 return yaffs_UnlinkObject(obj);
5333 /*----------------------- Initialisation Scanning ---------------------- */
5335 static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
5336 int backwardScanning)
5340 if (!backwardScanning) {
5341 /* Handle YAFFS1 forward scanning case
5342 * For YAFFS1 we always do the deletion
5346 /* Handle YAFFS2 case (backward scanning)
5347 * If the shadowed object exists then ignore.
5349 if (yaffs_FindObjectByNumber(dev, objId))
5353 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5354 * We put it in unlinked dir to be cleaned up after the scanning
5357 yaffs_FindOrCreateObjectByNumber(dev, objId,
5358 YAFFS_OBJECT_TYPE_FILE);
5361 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5362 obj->variant.fileVariant.shrinkSize = 0;
5363 obj->valid = 1; /* So that we don't read any other info for this file */
5373 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5380 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5382 in = yaffs_FindObjectByNumber(dev,
5383 hl->variant.hardLinkVariant.
5384 equivalentObjectId);
5387 /* Add the hardlink pointers */
5388 hl->variant.hardLinkVariant.equivalentObject = in;
5389 ylist_add(&hl->hardLinks, &in->hardLinks);
5391 /* Todo Need to report/handle this better.
5392 * Got a problem... hardlink to a non-existant object
5394 hl->variant.hardLinkVariant.equivalentObject = NULL;
5395 YINIT_LIST_HEAD(&hl->hardLinks);
5405 static int ybicmp(const void *a, const void *b)
5407 register int aseq = ((yaffs_BlockIndex *)a)->seq;
5408 register int bseq = ((yaffs_BlockIndex *)b)->seq;
5409 register int ablock = ((yaffs_BlockIndex *)a)->block;
5410 register int bblock = ((yaffs_BlockIndex *)b)->block;
5412 return ablock - bblock;
5418 struct yaffs_ShadowFixerStruct {
5421 struct yaffs_ShadowFixerStruct *next;
5425 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
5428 * Sort out state of unlinked and deleted objects after scanning.
5430 struct ylist_head *i;
5431 struct ylist_head *n;
5434 /* Soft delete all the unlinked files */
5435 ylist_for_each_safe(i, n,
5436 &dev->unlinkedDir->variant.directoryVariant.children) {
5438 l = ylist_entry(i, yaffs_Object, siblings);
5439 yaffs_DeleteObject(l);
5443 ylist_for_each_safe(i, n,
5444 &dev->deletedDir->variant.directoryVariant.children) {
5446 l = ylist_entry(i, yaffs_Object, siblings);
5447 yaffs_DeleteObject(l);
5453 static int yaffs_Scan(yaffs_Device *dev)
5455 yaffs_ExtendedTags tags;
5465 yaffs_BlockState state;
5466 yaffs_Object *hardList = NULL;
5467 yaffs_BlockInfo *bi;
5468 __u32 sequenceNumber;
5469 yaffs_ObjectHeader *oh;
5471 yaffs_Object *parent;
5473 int alloc_failed = 0;
5475 struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
5483 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
5484 dev->internalStartBlock, dev->internalEndBlock));
5486 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5488 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5490 /* Scan all the blocks to determine their state */
5491 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5492 bi = yaffs_GetBlockInfo(dev, blk);
5493 yaffs_ClearChunkBits(dev, blk);
5495 bi->softDeletions = 0;
5497 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5499 bi->blockState = state;
5500 bi->sequenceNumber = sequenceNumber;
5502 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
5503 bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
5505 T(YAFFS_TRACE_SCAN_DEBUG,
5506 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5507 state, sequenceNumber));
5509 if (state == YAFFS_BLOCK_STATE_DEAD) {
5510 T(YAFFS_TRACE_BAD_BLOCKS,
5511 (TSTR("block %d is bad" TENDSTR), blk));
5512 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5513 T(YAFFS_TRACE_SCAN_DEBUG,
5514 (TSTR("Block empty " TENDSTR)));
5515 dev->nErasedBlocks++;
5516 dev->nFreeChunks += dev->nChunksPerBlock;
5520 startIterator = dev->internalStartBlock;
5521 endIterator = dev->internalEndBlock;
5523 /* For each block.... */
5524 for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5531 blk = blockIterator;
5533 bi = yaffs_GetBlockInfo(dev, blk);
5534 state = bi->blockState;
5538 /* For each chunk in each block that needs scanning....*/
5539 for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
5540 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5541 /* Read the tags and decide what to do */
5542 chunk = blk * dev->nChunksPerBlock + c;
5544 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5547 /* Let's have a good look at this chunk... */
5549 if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
5555 /*T((" %d %d deleted\n",blk,c)); */
5556 } else if (!tags.chunkUsed) {
5557 /* An unassigned chunk in the block
5558 * This means that either the block is empty or
5559 * this is the one being allocated from
5563 /* We're looking at the first chunk in the block so the block is unused */
5564 state = YAFFS_BLOCK_STATE_EMPTY;
5565 dev->nErasedBlocks++;
5567 /* this is the block being allocated from */
5570 (" Allocating from %d %d" TENDSTR),
5572 state = YAFFS_BLOCK_STATE_ALLOCATING;
5573 dev->allocationBlock = blk;
5574 dev->allocationPage = c;
5575 dev->allocationBlockFinder = blk;
5576 /* Set it to here to encourage the allocator to go forth from here. */
5580 dev->nFreeChunks += (dev->nChunksPerBlock - c);
5581 } else if (tags.chunkId > 0) {
5582 /* chunkId > 0 so it is a data chunk... */
5583 unsigned int endpos;
5585 yaffs_SetChunkBit(dev, blk, c);
5588 in = yaffs_FindOrCreateObjectByNumber(dev,
5591 YAFFS_OBJECT_TYPE_FILE);
5592 /* PutChunkIntoFile checks for a clash (two data chunks with
5593 * the same chunkId).
5600 if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
5605 (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5608 in->variantType == YAFFS_OBJECT_TYPE_FILE
5609 && in->variant.fileVariant.scannedFileSize <
5611 in->variant.fileVariant.
5612 scannedFileSize = endpos;
5613 if (!dev->useHeaderFileSize) {
5614 in->variant.fileVariant.
5616 in->variant.fileVariant.
5621 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
5623 /* chunkId == 0, so it is an ObjectHeader.
5624 * Thus, we read in the object header and make the object
5626 yaffs_SetChunkBit(dev, blk, c);
5629 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
5633 oh = (yaffs_ObjectHeader *) chunkData;
5635 in = yaffs_FindObjectByNumber(dev,
5637 if (in && in->variantType != oh->type) {
5638 /* This should not happen, but somehow
5639 * Wev'e ended up with an objectId that has been reused but not yet
5640 * deleted, and worse still it has changed type. Delete the old object.
5643 yaffs_DeleteObject(in);
5648 in = yaffs_FindOrCreateObjectByNumber(dev,
5656 if (in && oh->shadowsObject > 0) {
5658 struct yaffs_ShadowFixerStruct *fixer;
5659 fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
5661 fixer->next = shadowFixerList;
5662 shadowFixerList = fixer;
5663 fixer->objectId = tags.objectId;
5664 fixer->shadowedId = oh->shadowsObject;
5669 if (in && in->valid) {
5670 /* We have already filled this one. We have a duplicate and need to resolve it. */
5672 unsigned existingSerial = in->serial;
5673 unsigned newSerial = tags.serialNumber;
5675 if (((existingSerial + 1) & 3) == newSerial) {
5676 /* Use new one - destroy the exisiting one */
5677 yaffs_DeleteChunk(dev,
5682 /* Use existing - destroy this one. */
5683 yaffs_DeleteChunk(dev, chunk, 1,
5688 if (in && !in->valid &&
5689 (tags.objectId == YAFFS_OBJECTID_ROOT ||
5690 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
5691 /* We only load some info, don't fiddle with directory structure */
5693 in->variantType = oh->type;
5695 in->yst_mode = oh->yst_mode;
5696 #ifdef CONFIG_YAFFS_WINCE
5697 in->win_atime[0] = oh->win_atime[0];
5698 in->win_ctime[0] = oh->win_ctime[0];
5699 in->win_mtime[0] = oh->win_mtime[0];
5700 in->win_atime[1] = oh->win_atime[1];
5701 in->win_ctime[1] = oh->win_ctime[1];
5702 in->win_mtime[1] = oh->win_mtime[1];
5704 in->yst_uid = oh->yst_uid;
5705 in->yst_gid = oh->yst_gid;
5706 in->yst_atime = oh->yst_atime;
5707 in->yst_mtime = oh->yst_mtime;
5708 in->yst_ctime = oh->yst_ctime;
5709 in->yst_rdev = oh->yst_rdev;
5711 in->hdrChunk = chunk;
5712 in->serial = tags.serialNumber;
5714 } else if (in && !in->valid) {
5715 /* we need to load this info */
5718 in->variantType = oh->type;
5720 in->yst_mode = oh->yst_mode;
5721 #ifdef CONFIG_YAFFS_WINCE
5722 in->win_atime[0] = oh->win_atime[0];
5723 in->win_ctime[0] = oh->win_ctime[0];
5724 in->win_mtime[0] = oh->win_mtime[0];
5725 in->win_atime[1] = oh->win_atime[1];
5726 in->win_ctime[1] = oh->win_ctime[1];
5727 in->win_mtime[1] = oh->win_mtime[1];
5729 in->yst_uid = oh->yst_uid;
5730 in->yst_gid = oh->yst_gid;
5731 in->yst_atime = oh->yst_atime;
5732 in->yst_mtime = oh->yst_mtime;
5733 in->yst_ctime = oh->yst_ctime;
5734 in->yst_rdev = oh->yst_rdev;
5736 in->hdrChunk = chunk;
5737 in->serial = tags.serialNumber;
5739 yaffs_SetObjectName(in, oh->name);
5742 /* directory stuff...
5747 yaffs_FindOrCreateObjectByNumber
5748 (dev, oh->parentObjectId,
5749 YAFFS_OBJECT_TYPE_DIRECTORY);
5752 if (parent && parent->variantType ==
5753 YAFFS_OBJECT_TYPE_UNKNOWN) {
5754 /* Set up as a directory */
5755 parent->variantType =
5756 YAFFS_OBJECT_TYPE_DIRECTORY;
5757 YINIT_LIST_HEAD(&parent->variant.
5760 } else if (!parent || parent->variantType !=
5761 YAFFS_OBJECT_TYPE_DIRECTORY) {
5762 /* Hoosterman, another problem....
5763 * We're trying to use a non-directory as a directory
5766 T(YAFFS_TRACE_ERROR,
5768 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
5770 parent = dev->lostNFoundDir;
5773 yaffs_AddObjectToDirectory(parent, in);
5775 if (0 && (parent == dev->deletedDir ||
5776 parent == dev->unlinkedDir)) {
5777 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
5778 dev->nDeletedFiles++;
5780 /* Note re hardlinks.
5781 * Since we might scan a hardlink before its equivalent object is scanned
5782 * we put them all in a list.
5783 * After scanning is complete, we should have all the objects, so we run through this
5784 * list and fix up all the chains.
5787 switch (in->variantType) {
5788 case YAFFS_OBJECT_TYPE_UNKNOWN:
5789 /* Todo got a problem */
5791 case YAFFS_OBJECT_TYPE_FILE:
5792 if (dev->useHeaderFileSize)
5794 in->variant.fileVariant.
5799 case YAFFS_OBJECT_TYPE_HARDLINK:
5800 in->variant.hardLinkVariant.
5801 equivalentObjectId =
5802 oh->equivalentObjectId;
5803 in->hardLinks.next =
5804 (struct ylist_head *)
5808 case YAFFS_OBJECT_TYPE_DIRECTORY:
5811 case YAFFS_OBJECT_TYPE_SPECIAL:
5814 case YAFFS_OBJECT_TYPE_SYMLINK:
5815 in->variant.symLinkVariant.alias =
5816 yaffs_CloneString(oh->alias);
5817 if (!in->variant.symLinkVariant.alias)
5823 if (parent == dev->deletedDir) {
5824 yaffs_DestroyObject(in);
5825 bi->hasShrinkHeader = 1;
5832 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5833 /* If we got this far while scanning, then the block is fully allocated.*/
5834 state = YAFFS_BLOCK_STATE_FULL;
5837 bi->blockState = state;
5839 /* Now let's see if it was dirty */
5840 if (bi->pagesInUse == 0 &&
5841 !bi->hasShrinkHeader &&
5842 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
5843 yaffs_BlockBecameDirty(dev, blk);
5849 /* Ok, we've done all the scanning.
5850 * Fix up the hard link chains.
5851 * We should now have scanned all the objects, now it's time to add these
5855 yaffs_HardlinkFixup(dev, hardList);
5857 /* Fix up any shadowed objects */
5859 struct yaffs_ShadowFixerStruct *fixer;
5862 while (shadowFixerList) {
5863 fixer = shadowFixerList;
5864 shadowFixerList = fixer->next;
5865 /* Complete the rename transaction by deleting the shadowed object
5866 * then setting the object header to unshadowed.
5868 obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
5870 yaffs_DeleteObject(obj);
5872 obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
5875 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
5881 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5886 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
5892 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
5895 yaffs_ObjectHeader *oh;
5897 yaffs_ExtendedTags tags;
5899 int alloc_failed = 0;
5907 T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
5909 in->lazyLoaded ? "not yet" : "already"));
5912 if (in->lazyLoaded && in->hdrChunk > 0) {
5914 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5916 result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
5917 oh = (yaffs_ObjectHeader *) chunkData;
5919 in->yst_mode = oh->yst_mode;
5920 #ifdef CONFIG_YAFFS_WINCE
5921 in->win_atime[0] = oh->win_atime[0];
5922 in->win_ctime[0] = oh->win_ctime[0];
5923 in->win_mtime[0] = oh->win_mtime[0];
5924 in->win_atime[1] = oh->win_atime[1];
5925 in->win_ctime[1] = oh->win_ctime[1];
5926 in->win_mtime[1] = oh->win_mtime[1];
5928 in->yst_uid = oh->yst_uid;
5929 in->yst_gid = oh->yst_gid;
5930 in->yst_atime = oh->yst_atime;
5931 in->yst_mtime = oh->yst_mtime;
5932 in->yst_ctime = oh->yst_ctime;
5933 in->yst_rdev = oh->yst_rdev;
5936 yaffs_SetObjectName(in, oh->name);
5938 if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
5939 in->variant.symLinkVariant.alias =
5940 yaffs_CloneString(oh->alias);
5941 if (!in->variant.symLinkVariant.alias)
5942 alloc_failed = 1; /* Not returned to caller */
5945 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5949 static int yaffs_ScanBackwards(yaffs_Device *dev)
5951 yaffs_ExtendedTags tags;
5956 int nBlocksToScan = 0;
5962 yaffs_BlockState state;
5963 yaffs_Object *hardList = NULL;
5964 yaffs_BlockInfo *bi;
5965 __u32 sequenceNumber;
5966 yaffs_ObjectHeader *oh;
5968 yaffs_Object *parent;
5969 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5975 int foundChunksInBlock;
5976 int equivalentObjectId;
5977 int alloc_failed = 0;
5980 yaffs_BlockIndex *blockIndex = NULL;
5981 int altBlockIndex = 0;
5983 if (!dev->isYaffs2) {
5985 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
5991 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
5992 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
5995 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5997 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
6000 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
6006 (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
6010 dev->blocksInCheckpoint = 0;
6012 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6014 /* Scan all the blocks to determine their state */
6015 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6016 bi = yaffs_GetBlockInfo(dev, blk);
6017 yaffs_ClearChunkBits(dev, blk);
6019 bi->softDeletions = 0;
6021 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6023 bi->blockState = state;
6024 bi->sequenceNumber = sequenceNumber;
6026 if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6027 bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6028 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6029 bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6031 T(YAFFS_TRACE_SCAN_DEBUG,
6032 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6033 state, sequenceNumber));
6036 if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
6037 dev->blocksInCheckpoint++;
6039 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6040 T(YAFFS_TRACE_BAD_BLOCKS,
6041 (TSTR("block %d is bad" TENDSTR), blk));
6042 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6043 T(YAFFS_TRACE_SCAN_DEBUG,
6044 (TSTR("Block empty " TENDSTR)));
6045 dev->nErasedBlocks++;
6046 dev->nFreeChunks += dev->nChunksPerBlock;
6047 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6049 /* Determine the highest sequence number */
6050 if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6051 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6053 blockIndex[nBlocksToScan].seq = sequenceNumber;
6054 blockIndex[nBlocksToScan].block = blk;
6058 if (sequenceNumber >= dev->sequenceNumber)
6059 dev->sequenceNumber = sequenceNumber;
6061 /* TODO: Nasty sequence number! */
6064 ("Block scanning block %d has bad sequence number %d"
6065 TENDSTR), blk, sequenceNumber));
6072 (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6078 /* Sort the blocks */
6079 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6081 /* Use qsort now. */
6082 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6086 /* Dungy old bubble sort... */
6088 yaffs_BlockIndex temp;
6092 for (i = 0; i < nBlocksToScan; i++)
6093 for (j = i + 1; j < nBlocksToScan; j++)
6094 if (blockIndex[i].seq > blockIndex[j].seq) {
6095 temp = blockIndex[j];
6096 blockIndex[j] = blockIndex[i];
6097 blockIndex[i] = temp;
6104 T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6106 /* Now scan the blocks looking at the data. */
6108 endIterator = nBlocksToScan - 1;
6109 T(YAFFS_TRACE_SCAN_DEBUG,
6110 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6112 /* For each block.... backwards */
6113 for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6115 /* Cooperative multitasking! This loop can run for so
6116 long that watchdog timers expire. */
6119 /* get the block to scan in the correct order */
6120 blk = blockIndex[blockIterator].block;
6122 bi = yaffs_GetBlockInfo(dev, blk);
6125 state = bi->blockState;
6129 /* For each chunk in each block that needs scanning.... */
6130 foundChunksInBlock = 0;
6131 for (c = dev->nChunksPerBlock - 1;
6132 !alloc_failed && c >= 0 &&
6133 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6134 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6135 /* Scan backwards...
6136 * Read the tags and decide what to do
6139 chunk = blk * dev->nChunksPerBlock + c;
6141 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6144 /* Let's have a good look at this chunk... */
6146 if (!tags.chunkUsed) {
6147 /* An unassigned chunk in the block.
6148 * If there are used chunks after this one, then
6149 * it is a chunk that was skipped due to failing the erased
6150 * check. Just skip it so that it can be deleted.
6151 * But, more typically, We get here when this is an unallocated
6152 * chunk and his means that either the block is empty or
6153 * this is the one being allocated from
6156 if (foundChunksInBlock) {
6157 /* This is a chunk that was skipped due to failing the erased check */
6158 } else if (c == 0) {
6159 /* We're looking at the first chunk in the block so the block is unused */
6160 state = YAFFS_BLOCK_STATE_EMPTY;
6161 dev->nErasedBlocks++;
6163 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6164 state == YAFFS_BLOCK_STATE_ALLOCATING) {
6165 if (dev->sequenceNumber == bi->sequenceNumber) {
6166 /* this is the block being allocated from */
6170 (" Allocating from %d %d"
6173 state = YAFFS_BLOCK_STATE_ALLOCATING;
6174 dev->allocationBlock = blk;
6175 dev->allocationPage = c;
6176 dev->allocationBlockFinder = blk;
6178 /* This is a partially written block that is not
6179 * the current allocation block. This block must have
6180 * had a write failure, so set up for retirement.
6183 /* bi->needsRetiring = 1; ??? TODO */
6184 bi->gcPrioritise = 1;
6186 T(YAFFS_TRACE_ALWAYS,
6187 (TSTR("Partially written block %d detected" TENDSTR),
6195 } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
6197 (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
6202 } else if (tags.chunkId > 0) {
6203 /* chunkId > 0 so it is a data chunk... */
6204 unsigned int endpos;
6206 (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6208 foundChunksInBlock = 1;
6211 yaffs_SetChunkBit(dev, blk, c);
6214 in = yaffs_FindOrCreateObjectByNumber(dev,
6217 YAFFS_OBJECT_TYPE_FILE);
6224 in->variantType == YAFFS_OBJECT_TYPE_FILE
6226 in->variant.fileVariant.shrinkSize) {
6227 /* This has not been invalidated by a resize */
6228 if (!yaffs_PutChunkIntoFile(in, tags.chunkId,
6233 /* File size is calculated by looking at the data chunks if we have not
6234 * seen an object header yet. Stop this practice once we find an object header.
6238 1) * dev->nDataBytesPerChunk +
6241 if (!in->valid && /* have not got an object header yet */
6242 in->variant.fileVariant.
6243 scannedFileSize < endpos) {
6244 in->variant.fileVariant.
6245 scannedFileSize = endpos;
6246 in->variant.fileVariant.
6248 in->variant.fileVariant.
6253 /* This chunk has been invalidated by a resize, so delete */
6254 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6258 /* chunkId == 0, so it is an ObjectHeader.
6259 * Thus, we read in the object header and make the object
6261 foundChunksInBlock = 1;
6263 yaffs_SetChunkBit(dev, blk, c);
6269 if (tags.extraHeaderInfoAvailable) {
6270 in = yaffs_FindOrCreateObjectByNumber
6271 (dev, tags.objectId,
6272 tags.extraObjectType);
6278 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
6281 tags.extraShadows ||
6283 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6284 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
6286 /* If we don't have valid info then we need to read the chunk
6287 * TODO In future we can probably defer reading the chunk and
6288 * living with invalid data until needed.
6291 result = yaffs_ReadChunkWithTagsFromNAND(dev,
6296 oh = (yaffs_ObjectHeader *) chunkData;
6298 if (dev->inbandTags) {
6299 /* Fix up the header if they got corrupted by inband tags */
6300 oh->shadowsObject = oh->inbandShadowsObject;
6301 oh->isShrink = oh->inbandIsShrink;
6305 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6313 /* TODO Hoosterman we have a problem! */
6314 T(YAFFS_TRACE_ERROR,
6316 ("yaffs tragedy: Could not make object for object %d at chunk %d during scan"
6317 TENDSTR), tags.objectId, chunk));
6322 /* We have already filled this one.
6323 * We have a duplicate that will be discarded, but
6324 * we first have to suck out resize info if it is a file.
6327 if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6329 oh->type == YAFFS_OBJECT_TYPE_FILE) ||
6330 (tags.extraHeaderInfoAvailable &&
6331 tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
6333 (oh) ? oh->fileSize : tags.
6335 __u32 parentObjectId =
6337 parentObjectId : tags.
6338 extraParentObjectId;
6342 (oh) ? oh->isShrink : tags.
6343 extraIsShrinkHeader;
6345 /* If it is deleted (unlinked at start also means deleted)
6346 * we treat the file size as being zeroed at this point.
6348 if (parentObjectId ==
6349 YAFFS_OBJECTID_DELETED
6350 || parentObjectId ==
6351 YAFFS_OBJECTID_UNLINKED) {
6357 in->variant.fileVariant.
6358 shrinkSize > thisSize) {
6359 in->variant.fileVariant.
6365 bi->hasShrinkHeader = 1;
6368 /* Use existing - destroy this one. */
6369 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6373 if (!in->valid && in->variantType !=
6374 (oh ? oh->type : tags.extraObjectType))
6375 T(YAFFS_TRACE_ERROR, (
6376 TSTR("yaffs tragedy: Bad object type, "
6377 TCONT("%d != %d, for object %d at chunk ")
6378 TCONT("%d during scan")
6380 oh->type : tags.extraObjectType,
6381 in->variantType, tags.objectId,
6385 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6387 YAFFS_OBJECTID_LOSTNFOUND)) {
6388 /* We only load some info, don't fiddle with directory structure */
6392 in->variantType = oh->type;
6394 in->yst_mode = oh->yst_mode;
6395 #ifdef CONFIG_YAFFS_WINCE
6396 in->win_atime[0] = oh->win_atime[0];
6397 in->win_ctime[0] = oh->win_ctime[0];
6398 in->win_mtime[0] = oh->win_mtime[0];
6399 in->win_atime[1] = oh->win_atime[1];
6400 in->win_ctime[1] = oh->win_ctime[1];
6401 in->win_mtime[1] = oh->win_mtime[1];
6403 in->yst_uid = oh->yst_uid;
6404 in->yst_gid = oh->yst_gid;
6405 in->yst_atime = oh->yst_atime;
6406 in->yst_mtime = oh->yst_mtime;
6407 in->yst_ctime = oh->yst_ctime;
6408 in->yst_rdev = oh->yst_rdev;
6412 in->variantType = tags.extraObjectType;
6416 in->hdrChunk = chunk;
6418 } else if (!in->valid) {
6419 /* we need to load this info */
6422 in->hdrChunk = chunk;
6425 in->variantType = oh->type;
6427 in->yst_mode = oh->yst_mode;
6428 #ifdef CONFIG_YAFFS_WINCE
6429 in->win_atime[0] = oh->win_atime[0];
6430 in->win_ctime[0] = oh->win_ctime[0];
6431 in->win_mtime[0] = oh->win_mtime[0];
6432 in->win_atime[1] = oh->win_atime[1];
6433 in->win_ctime[1] = oh->win_ctime[1];
6434 in->win_mtime[1] = oh->win_mtime[1];
6436 in->yst_uid = oh->yst_uid;
6437 in->yst_gid = oh->yst_gid;
6438 in->yst_atime = oh->yst_atime;
6439 in->yst_mtime = oh->yst_mtime;
6440 in->yst_ctime = oh->yst_ctime;
6441 in->yst_rdev = oh->yst_rdev;
6444 if (oh->shadowsObject > 0)
6445 yaffs_HandleShadowedObject(dev,
6451 yaffs_SetObjectName(in, oh->name);
6453 yaffs_FindOrCreateObjectByNumber
6454 (dev, oh->parentObjectId,
6455 YAFFS_OBJECT_TYPE_DIRECTORY);
6457 fileSize = oh->fileSize;
6458 isShrink = oh->isShrink;
6459 equivalentObjectId = oh->equivalentObjectId;
6462 in->variantType = tags.extraObjectType;
6464 yaffs_FindOrCreateObjectByNumber
6465 (dev, tags.extraParentObjectId,
6466 YAFFS_OBJECT_TYPE_DIRECTORY);
6467 fileSize = tags.extraFileLength;
6468 isShrink = tags.extraIsShrinkHeader;
6469 equivalentObjectId = tags.extraEquivalentObjectId;
6478 /* directory stuff...
6482 if (parent && parent->variantType ==
6483 YAFFS_OBJECT_TYPE_UNKNOWN) {
6484 /* Set up as a directory */
6485 parent->variantType =
6486 YAFFS_OBJECT_TYPE_DIRECTORY;
6487 YINIT_LIST_HEAD(&parent->variant.
6490 } else if (!parent || parent->variantType !=
6491 YAFFS_OBJECT_TYPE_DIRECTORY) {
6492 /* Hoosterman, another problem....
6493 * We're trying to use a non-directory as a directory
6496 T(YAFFS_TRACE_ERROR,
6498 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6500 parent = dev->lostNFoundDir;
6503 yaffs_AddObjectToDirectory(parent, in);
6505 itsUnlinked = (parent == dev->deletedDir) ||
6506 (parent == dev->unlinkedDir);
6509 /* Mark the block as having a shrinkHeader */
6510 bi->hasShrinkHeader = 1;
6513 /* Note re hardlinks.
6514 * Since we might scan a hardlink before its equivalent object is scanned
6515 * we put them all in a list.
6516 * After scanning is complete, we should have all the objects, so we run
6517 * through this list and fix up all the chains.
6520 switch (in->variantType) {
6521 case YAFFS_OBJECT_TYPE_UNKNOWN:
6522 /* Todo got a problem */
6524 case YAFFS_OBJECT_TYPE_FILE:
6526 if (in->variant.fileVariant.
6527 scannedFileSize < fileSize) {
6528 /* This covers the case where the file size is greater
6529 * than where the data is
6530 * This will happen if the file is resized to be larger
6531 * than its current data extents.
6533 in->variant.fileVariant.fileSize = fileSize;
6534 in->variant.fileVariant.scannedFileSize =
6535 in->variant.fileVariant.fileSize;
6539 in->variant.fileVariant.shrinkSize > fileSize) {
6540 in->variant.fileVariant.shrinkSize = fileSize;
6544 case YAFFS_OBJECT_TYPE_HARDLINK:
6546 in->variant.hardLinkVariant.equivalentObjectId =
6548 in->hardLinks.next =
6549 (struct ylist_head *) hardList;
6553 case YAFFS_OBJECT_TYPE_DIRECTORY:
6556 case YAFFS_OBJECT_TYPE_SPECIAL:
6559 case YAFFS_OBJECT_TYPE_SYMLINK:
6561 in->variant.symLinkVariant.alias =
6562 yaffs_CloneString(oh->alias);
6563 if (!in->variant.symLinkVariant.alias)
6573 } /* End of scanning for each chunk */
6575 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6576 /* If we got this far while scanning, then the block is fully allocated. */
6577 state = YAFFS_BLOCK_STATE_FULL;
6580 bi->blockState = state;
6582 /* Now let's see if it was dirty */
6583 if (bi->pagesInUse == 0 &&
6584 !bi->hasShrinkHeader &&
6585 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6586 yaffs_BlockBecameDirty(dev, blk);
6592 YFREE_ALT(blockIndex);
6596 /* Ok, we've done all the scanning.
6597 * Fix up the hard link chains.
6598 * We should now have scanned all the objects, now it's time to add these
6601 yaffs_HardlinkFixup(dev, hardList);
6604 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6609 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6614 /*------------------------------ Directory Functions ----------------------------- */
6616 static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
6618 struct ylist_head *lh;
6619 yaffs_Object *listObj;
6624 T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
6629 if (yaffs_SkipVerification(obj->myDev))
6633 T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
6638 if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6639 T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
6643 /* Iterate through the objects in each hash entry */
6645 ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
6647 listObj = ylist_entry(lh, yaffs_Object, siblings);
6648 yaffs_VerifyObject(listObj);
6655 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
6660 static void yaffs_VerifyDirectory(yaffs_Object *directory)
6662 struct ylist_head *lh;
6663 yaffs_Object *listObj;
6670 if (yaffs_SkipFullVerification(directory->myDev))
6673 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6674 T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
6678 /* Iterate through the objects in each hash entry */
6680 ylist_for_each(lh, &directory->variant.directoryVariant.children) {
6682 listObj = ylist_entry(lh, yaffs_Object, siblings);
6683 if (listObj->parent != directory) {
6684 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
6687 yaffs_VerifyObjectInDirectory(listObj);
6693 *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
6694 * link (ie. name) is created or deleted in the directory.
6697 * create dir/a : update dir's mtime/ctime
6698 * rm dir/a: update dir's mtime/ctime
6699 * modify dir/a: don't update dir's mtimme/ctime
6702 static void yaffs_UpdateParent(yaffs_Object *obj)
6708 obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
6710 yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
6713 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
6715 yaffs_Device *dev = obj->myDev;
6716 yaffs_Object *parent;
6718 yaffs_VerifyObjectInDirectory(obj);
6719 parent = obj->parent;
6721 yaffs_VerifyDirectory(parent);
6723 if (dev && dev->removeObjectCallback)
6724 dev->removeObjectCallback(obj);
6727 ylist_del_init(&obj->siblings);
6730 yaffs_VerifyDirectory(parent);
6733 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
6737 T(YAFFS_TRACE_ALWAYS,
6739 ("tragedy: Trying to add an object to a null pointer directory"
6744 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6745 T(YAFFS_TRACE_ALWAYS,
6747 ("tragedy: Trying to add an object to a non-directory"
6752 if (obj->siblings.prev == NULL) {
6753 /* Not initialised */
6758 yaffs_VerifyDirectory(directory);
6760 yaffs_RemoveObjectFromDirectory(obj);
6764 ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
6765 obj->parent = directory;
6767 if (directory == obj->myDev->unlinkedDir
6768 || directory == obj->myDev->deletedDir) {
6770 obj->myDev->nUnlinkedFiles++;
6771 obj->renameAllowed = 0;
6774 yaffs_VerifyDirectory(directory);
6775 yaffs_VerifyObjectInDirectory(obj);
6778 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
6783 struct ylist_head *i;
6784 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
6792 T(YAFFS_TRACE_ALWAYS,
6794 ("tragedy: yaffs_FindObjectByName: null pointer directory"
6799 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6800 T(YAFFS_TRACE_ALWAYS,
6802 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6806 sum = yaffs_CalcNameSum(name);
6808 ylist_for_each(i, &directory->variant.directoryVariant.children) {
6810 l = ylist_entry(i, yaffs_Object, siblings);
6812 if (l->parent != directory)
6815 yaffs_CheckObjectDetailsLoaded(l);
6817 /* Special case for lost-n-found */
6818 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6819 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
6821 } else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
6822 /* LostnFound chunk called Objxxx
6825 yaffs_GetObjectName(l, buffer,
6826 YAFFS_MAX_NAME_LENGTH + 1);
6827 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
6838 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
6839 int (*fn) (yaffs_Object *))
6841 struct ylist_head *i;
6845 T(YAFFS_TRACE_ALWAYS,
6847 ("tragedy: yaffs_FindObjectByName: null pointer directory"
6852 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6853 T(YAFFS_TRACE_ALWAYS,
6855 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6860 ylist_for_each(i, &theDir->variant.directoryVariant.children) {
6862 l = ylist_entry(i, yaffs_Object, siblings);
6873 /* GetEquivalentObject dereferences any hard links to get to the
6877 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
6879 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
6880 /* We want the object id of the equivalent object, not this one */
6881 obj = obj->variant.hardLinkVariant.equivalentObject;
6882 yaffs_CheckObjectDetailsLoaded(obj);
6887 int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
6889 memset(name, 0, buffSize * sizeof(YCHAR));
6891 yaffs_CheckObjectDetailsLoaded(obj);
6893 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6894 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
6895 } else if (obj->hdrChunk <= 0) {
6897 YCHAR numString[20];
6898 YCHAR *x = &numString[19];
6899 unsigned v = obj->objectId;
6903 *x = '0' + (v % 10);
6906 /* make up a name */
6907 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
6908 yaffs_strcat(locName, x);
6909 yaffs_strncpy(name, locName, buffSize - 1);
6912 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
6913 else if (obj->shortName[0])
6914 yaffs_strcpy(name, obj->shortName);
6918 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
6920 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
6922 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
6924 if (obj->hdrChunk > 0) {
6925 result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
6926 obj->hdrChunk, buffer,
6929 yaffs_strncpy(name, oh->name, buffSize - 1);
6931 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
6934 return yaffs_strlen(name);
6937 int yaffs_GetObjectFileLength(yaffs_Object *obj)
6939 /* Dereference any hard linking */
6940 obj = yaffs_GetEquivalentObject(obj);
6942 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
6943 return obj->variant.fileVariant.fileSize;
6944 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
6945 return yaffs_strlen(obj->variant.symLinkVariant.alias);
6947 /* Only a directory should drop through to here */
6948 return obj->myDev->nDataBytesPerChunk;
6952 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
6955 struct ylist_head *i;
6958 count++; /* the object itself */
6960 ylist_for_each(i, &obj->hardLinks)
6961 count++; /* add the hard links; */
6966 int yaffs_GetObjectInode(yaffs_Object *obj)
6968 obj = yaffs_GetEquivalentObject(obj);
6970 return obj->objectId;
6973 unsigned yaffs_GetObjectType(yaffs_Object *obj)
6975 obj = yaffs_GetEquivalentObject(obj);
6977 switch (obj->variantType) {
6978 case YAFFS_OBJECT_TYPE_FILE:
6981 case YAFFS_OBJECT_TYPE_DIRECTORY:
6984 case YAFFS_OBJECT_TYPE_SYMLINK:
6987 case YAFFS_OBJECT_TYPE_HARDLINK:
6990 case YAFFS_OBJECT_TYPE_SPECIAL:
6991 if (S_ISFIFO(obj->yst_mode))
6993 if (S_ISCHR(obj->yst_mode))
6995 if (S_ISBLK(obj->yst_mode))
6997 if (S_ISSOCK(obj->yst_mode))
7005 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
7007 obj = yaffs_GetEquivalentObject(obj);
7008 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
7009 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
7011 return yaffs_CloneString(_Y(""));
7014 #ifndef CONFIG_YAFFS_WINCE
7016 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
7018 unsigned int valid = attr->ia_valid;
7020 if (valid & ATTR_MODE)
7021 obj->yst_mode = attr->ia_mode;
7022 if (valid & ATTR_UID)
7023 obj->yst_uid = attr->ia_uid;
7024 if (valid & ATTR_GID)
7025 obj->yst_gid = attr->ia_gid;
7027 if (valid & ATTR_ATIME)
7028 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
7029 if (valid & ATTR_CTIME)
7030 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
7031 if (valid & ATTR_MTIME)
7032 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
7034 if (valid & ATTR_SIZE)
7035 yaffs_ResizeFile(obj, attr->ia_size);
7037 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
7042 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
7044 unsigned int valid = 0;
7046 attr->ia_mode = obj->yst_mode;
7048 attr->ia_uid = obj->yst_uid;
7050 attr->ia_gid = obj->yst_gid;
7053 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
7054 valid |= ATTR_ATIME;
7055 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
7056 valid |= ATTR_CTIME;
7057 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
7058 valid |= ATTR_MTIME;
7060 attr->ia_size = yaffs_GetFileSize(obj);
7063 attr->ia_valid = valid;
7071 int yaffs_DumpObject(yaffs_Object *obj)
7075 yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
7077 T(YAFFS_TRACE_ALWAYS,
7079 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
7080 " chunk %d type %d size %d\n"
7081 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
7082 obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
7083 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
7089 /*---------------------------- Initialisation code -------------------------------------- */
7091 static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
7094 /* Common functions, gotta have */
7095 if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
7098 #ifdef CONFIG_YAFFS_YAFFS2
7100 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
7101 if (dev->writeChunkWithTagsToNAND &&
7102 dev->readChunkWithTagsFromNAND &&
7103 !dev->writeChunkToNAND &&
7104 !dev->readChunkFromNAND &&
7105 dev->markNANDBlockBad && dev->queryNANDBlock)
7109 /* Can use the "spare" style interface for yaffs1 */
7110 if (!dev->isYaffs2 &&
7111 !dev->writeChunkWithTagsToNAND &&
7112 !dev->readChunkWithTagsFromNAND &&
7113 dev->writeChunkToNAND &&
7114 dev->readChunkFromNAND &&
7115 !dev->markNANDBlockBad && !dev->queryNANDBlock)
7122 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7124 /* Initialise the unlinked, deleted, root and lost and found directories */
7126 dev->lostNFoundDir = dev->rootDir = NULL;
7127 dev->unlinkedDir = dev->deletedDir = NULL;
7130 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7133 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7136 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7137 YAFFS_ROOT_MODE | S_IFDIR);
7138 dev->lostNFoundDir =
7139 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7140 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7142 if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
7143 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7150 int yaffs_GutsInitialise(yaffs_Device *dev)
7152 int init_failed = 0;
7156 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7158 /* Check stuff that must be set */
7161 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7165 dev->internalStartBlock = dev->startBlock;
7166 dev->internalEndBlock = dev->endBlock;
7167 dev->blockOffset = 0;
7168 dev->chunkOffset = 0;
7169 dev->nFreeChunks = 0;
7173 if (dev->startBlock == 0) {
7174 dev->internalStartBlock = dev->startBlock + 1;
7175 dev->internalEndBlock = dev->endBlock + 1;
7176 dev->blockOffset = 1;
7177 dev->chunkOffset = dev->nChunksPerBlock;
7180 /* Check geometry parameters. */
7182 if ((!dev->inbandTags && dev->isYaffs2 && dev->totalBytesPerChunk < 1024) ||
7183 (!dev->isYaffs2 && dev->totalBytesPerChunk < 512) ||
7184 (dev->inbandTags && !dev->isYaffs2) ||
7185 dev->nChunksPerBlock < 2 ||
7186 dev->nReservedBlocks < 2 ||
7187 dev->internalStartBlock <= 0 ||
7188 dev->internalEndBlock <= 0 ||
7189 dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2)) { /* otherwise it is too small */
7190 T(YAFFS_TRACE_ALWAYS,
7192 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
7193 TENDSTR), dev->totalBytesPerChunk, dev->isYaffs2 ? "2" : "", dev->inbandTags));
7197 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7198 T(YAFFS_TRACE_ALWAYS,
7199 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7203 /* Sort out space for inband tags, if required */
7204 if (dev->inbandTags)
7205 dev->nDataBytesPerChunk = dev->totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
7207 dev->nDataBytesPerChunk = dev->totalBytesPerChunk;
7209 /* Got the right mix of functions? */
7210 if (!yaffs_CheckDevFunctions(dev)) {
7211 /* Function missing */
7212 T(YAFFS_TRACE_ALWAYS,
7214 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7219 /* This is really a compilation check. */
7220 if (!yaffs_CheckStructures()) {
7221 T(YAFFS_TRACE_ALWAYS,
7222 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7226 if (dev->isMounted) {
7227 T(YAFFS_TRACE_ALWAYS,
7228 (TSTR("yaffs: device already mounted\n" TENDSTR)));
7232 /* Finished with most checks. One or two more checks happen later on too. */
7236 /* OK now calculate a few things for the device */
7239 * Calculate all the chunk size manipulation numbers:
7241 x = dev->nDataBytesPerChunk;
7242 /* We always use dev->chunkShift and dev->chunkDiv */
7243 dev->chunkShift = Shifts(x);
7244 x >>= dev->chunkShift;
7246 /* We only use chunk mask if chunkDiv is 1 */
7247 dev->chunkMask = (1<<dev->chunkShift) - 1;
7250 * Calculate chunkGroupBits.
7251 * We need to find the next power of 2 > than internalEndBlock
7254 x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
7258 /* Set up tnode width if wide tnodes are enabled. */
7259 if (!dev->wideTnodesDisabled) {
7260 /* bits must be even so that we end up with 32-bit words */
7264 dev->tnodeWidth = 16;
7266 dev->tnodeWidth = bits;
7268 dev->tnodeWidth = 16;
7270 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7272 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7273 * so if the bitwidth of the
7274 * chunk range we're using is greater than 16 we need
7275 * to figure out chunk shift and chunkGroupSize
7278 if (bits <= dev->tnodeWidth)
7279 dev->chunkGroupBits = 0;
7281 dev->chunkGroupBits = bits - dev->tnodeWidth;
7284 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7286 if (dev->nChunksPerBlock < dev->chunkGroupSize) {
7287 /* We have a problem because the soft delete won't work if
7288 * the chunk group size > chunks per block.
7289 * This can be remedied by using larger "virtual blocks".
7291 T(YAFFS_TRACE_ALWAYS,
7292 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7297 /* OK, we've finished verifying the device, lets continue with initialisation */
7299 /* More device initialisation */
7300 dev->garbageCollections = 0;
7301 dev->passiveGarbageCollections = 0;
7302 dev->currentDirtyChecker = 0;
7303 dev->bufferedBlock = -1;
7304 dev->doingBufferedBlockRewrite = 0;
7305 dev->nDeletedFiles = 0;
7306 dev->nBackgroundDeletions = 0;
7307 dev->nUnlinkedFiles = 0;
7309 dev->eccUnfixed = 0;
7310 dev->tagsEccFixed = 0;
7311 dev->tagsEccUnfixed = 0;
7312 dev->nErasureFailures = 0;
7313 dev->nErasedBlocks = 0;
7315 dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7317 /* Initialise temporary buffers and caches. */
7318 if (!yaffs_InitialiseTempBuffers(dev))
7321 dev->srCache = NULL;
7322 dev->gcCleanupList = NULL;
7326 dev->nShortOpCaches > 0) {
7329 int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
7331 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
7332 dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7334 dev->srCache = YMALLOC(srCacheBytes);
7336 buf = (__u8 *) dev->srCache;
7339 memset(dev->srCache, 0, srCacheBytes);
7341 for (i = 0; i < dev->nShortOpCaches && buf; i++) {
7342 dev->srCache[i].object = NULL;
7343 dev->srCache[i].lastUse = 0;
7344 dev->srCache[i].dirty = 0;
7345 dev->srCache[i].data = buf = YMALLOC_DMA(dev->totalBytesPerChunk);
7356 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
7357 if (!dev->gcCleanupList)
7362 dev->useHeaderFileSize = 1;
7364 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7367 yaffs_InitialiseTnodes(dev);
7368 yaffs_InitialiseObjects(dev);
7370 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7375 /* Now scan the flash. */
7376 if (dev->isYaffs2) {
7377 if (yaffs_CheckpointRestore(dev)) {
7378 yaffs_CheckObjectDetailsLoaded(dev->rootDir);
7379 T(YAFFS_TRACE_ALWAYS,
7380 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7383 /* Clean up the mess caused by an aborted checkpoint load
7384 * and scan backwards.
7386 yaffs_DeinitialiseBlocks(dev);
7387 yaffs_DeinitialiseTnodes(dev);
7388 yaffs_DeinitialiseObjects(dev);
7391 dev->nErasedBlocks = 0;
7392 dev->nFreeChunks = 0;
7393 dev->allocationBlock = -1;
7394 dev->allocationPage = -1;
7395 dev->nDeletedFiles = 0;
7396 dev->nUnlinkedFiles = 0;
7397 dev->nBackgroundDeletions = 0;
7398 dev->oldestDirtySequence = 0;
7400 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7403 yaffs_InitialiseTnodes(dev);
7404 yaffs_InitialiseObjects(dev);
7406 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7409 if (!init_failed && !yaffs_ScanBackwards(dev))
7412 } else if (!yaffs_Scan(dev))
7415 yaffs_StripDeletedObjects(dev);
7419 /* Clean up the mess */
7420 T(YAFFS_TRACE_TRACING,
7421 (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7423 yaffs_Deinitialise(dev);
7427 /* Zero out stats */
7428 dev->nPageReads = 0;
7429 dev->nPageWrites = 0;
7430 dev->nBlockErasures = 0;
7432 dev->nRetriedWrites = 0;
7434 dev->nRetiredBlocks = 0;
7436 yaffs_VerifyFreeChunks(dev);
7437 yaffs_VerifyBlocks(dev);
7440 T(YAFFS_TRACE_TRACING,
7441 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7446 void yaffs_Deinitialise(yaffs_Device *dev)
7448 if (dev->isMounted) {
7451 yaffs_DeinitialiseBlocks(dev);
7452 yaffs_DeinitialiseTnodes(dev);
7453 yaffs_DeinitialiseObjects(dev);
7454 if (dev->nShortOpCaches > 0 &&
7457 for (i = 0; i < dev->nShortOpCaches; i++) {
7458 if (dev->srCache[i].data)
7459 YFREE(dev->srCache[i].data);
7460 dev->srCache[i].data = NULL;
7463 YFREE(dev->srCache);
7464 dev->srCache = NULL;
7467 YFREE(dev->gcCleanupList);
7469 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
7470 YFREE(dev->tempBuffer[i].buffer);
7474 if (dev->deinitialiseNAND)
7475 dev->deinitialiseNAND(dev);
7479 static int yaffs_CountFreeChunks(yaffs_Device *dev)
7484 yaffs_BlockInfo *blk;
7486 for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7488 blk = yaffs_GetBlockInfo(dev, b);
7490 switch (blk->blockState) {
7491 case YAFFS_BLOCK_STATE_EMPTY:
7492 case YAFFS_BLOCK_STATE_ALLOCATING:
7493 case YAFFS_BLOCK_STATE_COLLECTING:
7494 case YAFFS_BLOCK_STATE_FULL:
7496 (dev->nChunksPerBlock - blk->pagesInUse +
7497 blk->softDeletions);
7507 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
7509 /* This is what we report to the outside world */
7512 int nDirtyCacheChunks;
7513 int blocksForCheckpoint;
7517 nFree = dev->nFreeChunks;
7519 nFree = yaffs_CountFreeChunks(dev);
7522 nFree += dev->nDeletedFiles;
7524 /* Now count the number of dirty chunks in the cache and subtract those */
7526 for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
7527 if (dev->srCache[i].dirty)
7528 nDirtyCacheChunks++;
7531 nFree -= nDirtyCacheChunks;
7533 nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
7535 /* Now we figure out how much to reserve for the checkpoint and report that... */
7536 blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
7537 if (blocksForCheckpoint < 0)
7538 blocksForCheckpoint = 0;
7540 nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
7549 static int yaffs_freeVerificationFailures;
7551 static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
7556 if (yaffs_SkipVerification(dev))
7559 counted = yaffs_CountFreeChunks(dev);
7561 difference = dev->nFreeChunks - counted;
7564 T(YAFFS_TRACE_ALWAYS,
7565 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7566 dev->nFreeChunks, counted, difference));
7567 yaffs_freeVerificationFailures++;
7571 /*---------------------------------------- YAFFS test code ----------------------*/
7573 #define yaffs_CheckStruct(structure, syze, name) \
7575 if (sizeof(structure) != syze) { \
7576 T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
7577 name, syze, sizeof(structure))); \
7578 return YAFFS_FAIL; \
7582 static int yaffs_CheckStructures(void)
7584 /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
7585 /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
7586 /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
7587 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7588 yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode");
7590 #ifndef CONFIG_YAFFS_WINCE
7591 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");