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 =
15 "$Id: yaffs_guts.c,v 1.87 2009-07-29 04:30:24 charles Exp $";
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)) {
1548 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1550 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1561 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1562 * chunks and tnodes in the file
1563 * Returns 1 if the tree was deleted.
1564 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1567 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
1568 int chunkOffset, int *limit)
1573 yaffs_ExtendedTags tags;
1575 yaffs_Device *dev = in->myDev;
1581 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1583 if (tn->internal[i]) {
1584 if (limit && (*limit) < 0) {
1588 yaffs_DeleteWorker(in,
1596 YAFFS_TNODES_INTERNAL_BITS)
1601 yaffs_FreeTnode(dev,
1604 tn->internal[i] = NULL;
1608 return (allDone) ? 1 : 0;
1609 } else if (level == 0) {
1612 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1614 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1617 chunkInInode = (chunkOffset <<
1618 YAFFS_TNODES_LEVEL0_BITS) + i;
1621 yaffs_FindChunkInGroup(dev,
1627 if (foundChunk > 0) {
1628 yaffs_DeleteChunk(dev,
1633 *limit = *limit - 1;
1640 yaffs_PutLevel0Tnode(dev, tn, i, 0);
1644 return (i < 0) ? 1 : 0;
1654 static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
1656 yaffs_BlockInfo *theBlock;
1658 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1660 theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1662 theBlock->softDeletions++;
1667 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1668 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1670 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1673 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
1674 __u32 level, int chunkOffset)
1679 yaffs_Device *dev = in->myDev;
1684 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1686 if (tn->internal[i]) {
1688 yaffs_SoftDeleteWorker(in,
1694 YAFFS_TNODES_INTERNAL_BITS)
1697 yaffs_FreeTnode(dev,
1700 tn->internal[i] = NULL;
1702 /* Hoosterman... how could this happen? */
1706 return (allDone) ? 1 : 0;
1707 } else if (level == 0) {
1709 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1710 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1712 /* Note this does not find the real chunk, only the chunk group.
1713 * We make an assumption that a chunk group is not larger than
1716 yaffs_SoftDeleteChunk(dev, theChunk);
1717 yaffs_PutLevel0Tnode(dev, tn, i, 0);
1731 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1734 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1735 if (obj->nDataChunks <= 0) {
1736 /* Empty file with no duplicate object headers, just delete it immediately */
1737 yaffs_FreeTnode(obj->myDev,
1738 obj->variant.fileVariant.top);
1739 obj->variant.fileVariant.top = NULL;
1740 T(YAFFS_TRACE_TRACING,
1741 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1743 yaffs_DoGenericObjectDeletion(obj);
1745 yaffs_SoftDeleteWorker(obj,
1746 obj->variant.fileVariant.top,
1747 obj->variant.fileVariant.
1749 obj->softDeleted = 1;
1754 /* Pruning removes any part of the file structure tree that is beyond the
1755 * bounds of the file (ie that does not point to chunks).
1757 * A file should only get pruned when its size is reduced.
1759 * Before pruning, the chunks must be pulled from the tree and the
1760 * level 0 tnode entries must be zeroed out.
1761 * Could also use this for file deletion, but that's probably better handled
1762 * by a special case.
1765 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
1766 __u32 level, int del0)
1774 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1775 if (tn->internal[i] && level > 0) {
1777 yaffs_PruneWorker(dev, tn->internal[i],
1779 (i == 0) ? del0 : 1);
1782 if (tn->internal[i])
1786 if (hasData == 0 && del0) {
1787 /* Free and return NULL */
1789 yaffs_FreeTnode(dev, tn);
1799 static int yaffs_PruneFileStructure(yaffs_Device *dev,
1800 yaffs_FileStructure *fStruct)
1807 if (fStruct->topLevel > 0) {
1809 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1811 /* Now we have a tree with all the non-zero branches NULL but the height
1812 * is the same as it was.
1813 * Let's see if we can trim internal tnodes to shorten the tree.
1814 * We can do this if only the 0th element in the tnode is in use
1815 * (ie all the non-zero are NULL)
1818 while (fStruct->topLevel && !done) {
1822 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1823 if (tn->internal[i])
1828 fStruct->top = tn->internal[0];
1829 fStruct->topLevel--;
1830 yaffs_FreeTnode(dev, tn);
1840 /*-------------------- End of File Structure functions.-------------------*/
1842 /* yaffs_CreateFreeObjects creates a bunch more objects and
1843 * adds them to the object free list.
1845 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
1848 yaffs_Object *newObjects;
1849 yaffs_ObjectList *list;
1854 /* make these things */
1855 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1856 list = YMALLOC(sizeof(yaffs_ObjectList));
1858 if (!newObjects || !list) {
1863 T(YAFFS_TRACE_ALLOCATE,
1864 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1868 /* Hook them into the free list */
1869 for (i = 0; i < nObjects - 1; i++) {
1870 newObjects[i].siblings.next =
1871 (struct ylist_head *)(&newObjects[i + 1]);
1874 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1875 dev->freeObjects = newObjects;
1876 dev->nFreeObjects += nObjects;
1877 dev->nObjectsCreated += nObjects;
1879 /* Now add this bunch of Objects to a list for freeing up. */
1881 list->objects = newObjects;
1882 list->next = dev->allocatedObjectList;
1883 dev->allocatedObjectList = list;
1889 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1890 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
1892 yaffs_Object *tn = NULL;
1894 #ifdef VALGRIND_TEST
1895 tn = YMALLOC(sizeof(yaffs_Object));
1897 /* If there are none left make more */
1898 if (!dev->freeObjects)
1899 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1901 if (dev->freeObjects) {
1902 tn = dev->freeObjects;
1904 (yaffs_Object *) (dev->freeObjects->siblings.next);
1905 dev->nFreeObjects--;
1909 /* Now sweeten it up... */
1911 memset(tn, 0, sizeof(yaffs_Object));
1912 tn->beingCreated = 1;
1916 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1917 YINIT_LIST_HEAD(&(tn->hardLinks));
1918 YINIT_LIST_HEAD(&(tn->hashLink));
1919 YINIT_LIST_HEAD(&tn->siblings);
1922 /* Now make the directory sane */
1924 tn->parent = dev->rootDir;
1925 ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
1928 /* Add it to the lost and found directory.
1929 * NB Can't put root or lostNFound in lostNFound so
1930 * check if lostNFound exists first
1932 if (dev->lostNFoundDir)
1933 yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1935 tn->beingCreated = 0;
1938 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1943 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
1948 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1950 obj->fake = 1; /* it is fake so it might have no NAND presence... */
1951 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1952 obj->unlinkAllowed = 0; /* ... or unlink it */
1955 obj->yst_mode = mode;
1957 obj->hdrChunk = 0; /* Not a valid chunk. */
1964 static void yaffs_UnhashObject(yaffs_Object *tn)
1967 yaffs_Device *dev = tn->myDev;
1969 /* If it is still linked into the bucket list, free from the list */
1970 if (!ylist_empty(&tn->hashLink)) {
1971 ylist_del_init(&tn->hashLink);
1972 bucket = yaffs_HashFunction(tn->objectId);
1973 dev->objectBucket[bucket].count--;
1977 /* FreeObject frees up a Object and puts it back on the free list */
1978 static void yaffs_FreeObject(yaffs_Object *tn)
1980 yaffs_Device *dev = tn->myDev;
1983 T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
1988 if (!ylist_empty(&tn->siblings))
1994 /* We're still hooked up to a cached inode.
1995 * Don't delete now, but mark for later deletion
1997 tn->deferedFree = 1;
2002 yaffs_UnhashObject(tn);
2004 #ifdef VALGRIND_TEST
2007 /* Link into the free list. */
2008 tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
2009 dev->freeObjects = tn;
2010 dev->nFreeObjects++;
2012 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2017 void yaffs_HandleDeferedFree(yaffs_Object *obj)
2019 if (obj->deferedFree)
2020 yaffs_FreeObject(obj);
2025 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
2027 /* Free the list of allocated Objects */
2029 yaffs_ObjectList *tmp;
2031 while (dev->allocatedObjectList) {
2032 tmp = dev->allocatedObjectList->next;
2033 YFREE(dev->allocatedObjectList->objects);
2034 YFREE(dev->allocatedObjectList);
2036 dev->allocatedObjectList = tmp;
2039 dev->freeObjects = NULL;
2040 dev->nFreeObjects = 0;
2043 static void yaffs_InitialiseObjects(yaffs_Device *dev)
2047 dev->allocatedObjectList = NULL;
2048 dev->freeObjects = NULL;
2049 dev->nFreeObjects = 0;
2051 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2052 YINIT_LIST_HEAD(&dev->objectBucket[i].list);
2053 dev->objectBucket[i].count = 0;
2057 static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
2062 int lowest = 999999;
2064 /* First let's see if we can find one that's empty. */
2066 for (i = 0; i < 10 && lowest > 0; i++) {
2068 x %= YAFFS_NOBJECT_BUCKETS;
2069 if (dev->objectBucket[x].count < lowest) {
2070 lowest = dev->objectBucket[x].count;
2076 /* If we didn't find an empty list, then try
2077 * looking a bit further for a short one
2080 for (i = 0; i < 10 && lowest > 3; i++) {
2082 x %= YAFFS_NOBJECT_BUCKETS;
2083 if (dev->objectBucket[x].count < lowest) {
2084 lowest = dev->objectBucket[x].count;
2093 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
2095 int bucket = yaffs_FindNiceObjectBucket(dev);
2097 /* Now find an object value that has not already been taken
2098 * by scanning the list.
2102 struct ylist_head *i;
2104 __u32 n = (__u32) bucket;
2106 /* yaffs_CheckObjectHashSanity(); */
2110 n += YAFFS_NOBJECT_BUCKETS;
2111 if (1 || dev->objectBucket[bucket].count > 0) {
2112 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2113 /* If there is already one in the list */
2114 if (i && ylist_entry(i, yaffs_Object,
2115 hashLink)->objectId == n) {
2125 static void yaffs_HashObject(yaffs_Object *in)
2127 int bucket = yaffs_HashFunction(in->objectId);
2128 yaffs_Device *dev = in->myDev;
2130 ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
2131 dev->objectBucket[bucket].count++;
2134 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
2136 int bucket = yaffs_HashFunction(number);
2137 struct ylist_head *i;
2140 ylist_for_each(i, &dev->objectBucket[bucket].list) {
2141 /* Look if it is in the list */
2143 in = ylist_entry(i, yaffs_Object, hashLink);
2144 if (in->objectId == number) {
2146 /* Don't tell the VFS about this one if it is defered free */
2147 if (in->deferedFree)
2159 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
2160 yaffs_ObjectType type)
2162 yaffs_Object *theObject;
2163 yaffs_Tnode *tn = NULL;
2166 number = yaffs_CreateNewObjectNumber(dev);
2168 theObject = yaffs_AllocateEmptyObject(dev);
2172 if (type == YAFFS_OBJECT_TYPE_FILE) {
2173 tn = yaffs_GetTnode(dev);
2175 yaffs_FreeObject(theObject);
2181 theObject->fake = 0;
2182 theObject->renameAllowed = 1;
2183 theObject->unlinkAllowed = 1;
2184 theObject->objectId = number;
2185 yaffs_HashObject(theObject);
2186 theObject->variantType = type;
2187 #ifdef CONFIG_YAFFS_WINCE
2188 yfsd_WinFileTimeNow(theObject->win_atime);
2189 theObject->win_ctime[0] = theObject->win_mtime[0] =
2190 theObject->win_atime[0];
2191 theObject->win_ctime[1] = theObject->win_mtime[1] =
2192 theObject->win_atime[1];
2196 theObject->yst_atime = theObject->yst_mtime =
2197 theObject->yst_ctime = Y_CURRENT_TIME;
2200 case YAFFS_OBJECT_TYPE_FILE:
2201 theObject->variant.fileVariant.fileSize = 0;
2202 theObject->variant.fileVariant.scannedFileSize = 0;
2203 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2204 theObject->variant.fileVariant.topLevel = 0;
2205 theObject->variant.fileVariant.top = tn;
2207 case YAFFS_OBJECT_TYPE_DIRECTORY:
2208 YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2211 case YAFFS_OBJECT_TYPE_SYMLINK:
2212 case YAFFS_OBJECT_TYPE_HARDLINK:
2213 case YAFFS_OBJECT_TYPE_SPECIAL:
2214 /* No action required */
2216 case YAFFS_OBJECT_TYPE_UNKNOWN:
2217 /* todo this should not happen */
2225 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
2227 yaffs_ObjectType type)
2229 yaffs_Object *theObject = NULL;
2232 theObject = yaffs_FindObjectByNumber(dev, number);
2235 theObject = yaffs_CreateNewObject(dev, number, type);
2242 static YCHAR *yaffs_CloneString(const YCHAR *str)
2244 YCHAR *newStr = NULL;
2247 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
2249 yaffs_strcpy(newStr, str);
2257 * Mknod (create) a new object.
2258 * equivalentObject only has meaning for a hard link;
2259 * aliasString only has meaning for a sumlink.
2260 * rdev only has meaning for devices (a subset of special objects)
2263 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2264 yaffs_Object *parent,
2269 yaffs_Object *equivalentObject,
2270 const YCHAR *aliasString, __u32 rdev)
2275 yaffs_Device *dev = parent->myDev;
2277 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2278 if (yaffs_FindObjectByName(parent, name))
2281 in = yaffs_CreateNewObject(dev, -1, type);
2286 if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2287 str = yaffs_CloneString(aliasString);
2289 yaffs_FreeObject(in);
2299 in->variantType = type;
2301 in->yst_mode = mode;
2303 #ifdef CONFIG_YAFFS_WINCE
2304 yfsd_WinFileTimeNow(in->win_atime);
2305 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2306 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2309 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2311 in->yst_rdev = rdev;
2315 in->nDataChunks = 0;
2317 yaffs_SetObjectName(in, name);
2320 yaffs_AddObjectToDirectory(parent, in);
2322 in->myDev = parent->myDev;
2325 case YAFFS_OBJECT_TYPE_SYMLINK:
2326 in->variant.symLinkVariant.alias = str;
2328 case YAFFS_OBJECT_TYPE_HARDLINK:
2329 in->variant.hardLinkVariant.equivalentObject =
2331 in->variant.hardLinkVariant.equivalentObjectId =
2332 equivalentObject->objectId;
2333 ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
2335 case YAFFS_OBJECT_TYPE_FILE:
2336 case YAFFS_OBJECT_TYPE_DIRECTORY:
2337 case YAFFS_OBJECT_TYPE_SPECIAL:
2338 case YAFFS_OBJECT_TYPE_UNKNOWN:
2343 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2344 /* Could not create the object header, fail the creation */
2345 yaffs_DeleteObject(in);
2349 yaffs_UpdateParent(parent);
2355 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
2356 __u32 mode, __u32 uid, __u32 gid)
2358 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2359 uid, gid, NULL, NULL, 0);
2362 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
2363 __u32 mode, __u32 uid, __u32 gid)
2365 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2366 mode, uid, gid, NULL, NULL, 0);
2369 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
2370 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2372 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2373 uid, gid, NULL, NULL, rdev);
2376 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
2377 __u32 mode, __u32 uid, __u32 gid,
2380 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2381 uid, gid, NULL, alias, 0);
2384 /* yaffs_Link returns the object id of the equivalent object.*/
2385 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
2386 yaffs_Object *equivalentObject)
2388 /* Get the real object in case we were fed a hard link as an equivalent object */
2389 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2391 if (yaffs_MknodObject
2392 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2393 equivalentObject, NULL, 0)) {
2394 return equivalentObject;
2401 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
2402 const YCHAR *newName, int force, int shadows)
2407 yaffs_Object *existingTarget;
2410 newDir = obj->parent; /* use the old directory */
2412 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2413 T(YAFFS_TRACE_ALWAYS,
2415 ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
2420 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2421 if (obj->myDev->isYaffs2)
2422 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2424 unlinkOp = (newDir == obj->myDev->unlinkedDir
2425 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2427 deleteOp = (newDir == obj->myDev->deletedDir);
2429 existingTarget = yaffs_FindObjectByName(newDir, newName);
2431 /* If the object is a file going into the unlinked directory,
2432 * then it is OK to just stuff it in since duplicate names are allowed.
2433 * else only proceed if the new name does not exist and if we're putting
2434 * it into a directory.
2441 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2442 yaffs_SetObjectName(obj, newName);
2445 yaffs_AddObjectToDirectory(newDir, obj);
2450 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2451 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
2458 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
2459 yaffs_Object *newDir, const YCHAR *newName)
2461 yaffs_Object *obj = NULL;
2462 yaffs_Object *existingTarget = NULL;
2466 if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2468 if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2471 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2472 /* Special case for case insemsitive systems (eg. WinCE).
2473 * While look-up is case insensitive, the name isn't.
2474 * Therefore we might want to change x.txt to X.txt
2476 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
2480 else if (yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
2484 obj = yaffs_FindObjectByName(oldDir, oldName);
2486 if (obj && obj->renameAllowed) {
2488 /* Now do the handling for an existing target, if there is one */
2490 existingTarget = yaffs_FindObjectByName(newDir, newName);
2491 if (existingTarget &&
2492 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2493 !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
2494 /* There is a target that is a non-empty directory, so we fail */
2495 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
2496 } else if (existingTarget && existingTarget != obj) {
2497 /* Nuke the target first, using shadowing,
2498 * but only if it isn't the same object
2500 yaffs_ChangeObjectName(obj, newDir, newName, force,
2501 existingTarget->objectId);
2502 yaffs_UnlinkObject(existingTarget);
2504 yaffs_UpdateParent(oldDir);
2505 if(newDir != oldDir)
2506 yaffs_UpdateParent(newDir);
2508 return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2513 /*------------------------- Block Management and Page Allocation ----------------*/
2515 static int yaffs_InitialiseBlocks(yaffs_Device *dev)
2517 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2519 dev->blockInfo = NULL;
2520 dev->chunkBits = NULL;
2522 dev->allocationBlock = -1; /* force it to get a new one */
2524 /* If the first allocation strategy fails, thry the alternate one */
2525 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2526 if (!dev->blockInfo) {
2527 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2528 dev->blockInfoAlt = 1;
2530 dev->blockInfoAlt = 0;
2532 if (dev->blockInfo) {
2533 /* Set up dynamic blockinfo stuff. */
2534 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
2535 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2536 if (!dev->chunkBits) {
2537 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2538 dev->chunkBitsAlt = 1;
2540 dev->chunkBitsAlt = 0;
2543 if (dev->blockInfo && dev->chunkBits) {
2544 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2545 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2552 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2554 if (dev->blockInfoAlt && dev->blockInfo)
2555 YFREE_ALT(dev->blockInfo);
2556 else if (dev->blockInfo)
2557 YFREE(dev->blockInfo);
2559 dev->blockInfoAlt = 0;
2561 dev->blockInfo = NULL;
2563 if (dev->chunkBitsAlt && dev->chunkBits)
2564 YFREE_ALT(dev->chunkBits);
2565 else if (dev->chunkBits)
2566 YFREE(dev->chunkBits);
2567 dev->chunkBitsAlt = 0;
2568 dev->chunkBits = NULL;
2571 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
2572 yaffs_BlockInfo *bi)
2579 return 1; /* disqualification only applies to yaffs2. */
2581 if (!bi->hasShrinkHeader)
2582 return 1; /* can gc */
2584 /* Find the oldest dirty sequence number if we don't know it and save it
2585 * so we don't have to keep recomputing it.
2587 if (!dev->oldestDirtySequence) {
2588 seq = dev->sequenceNumber;
2590 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2592 b = yaffs_GetBlockInfo(dev, i);
2593 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2594 (b->pagesInUse - b->softDeletions) <
2595 dev->nChunksPerBlock && b->sequenceNumber < seq) {
2596 seq = b->sequenceNumber;
2599 dev->oldestDirtySequence = seq;
2602 /* Can't do gc of this block if there are any blocks older than this one that have
2605 return (bi->sequenceNumber <= dev->oldestDirtySequence);
2608 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
2609 * for garbage collection.
2612 static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
2615 int b = dev->currentDirtyChecker;
2621 int prioritised = 0;
2622 yaffs_BlockInfo *bi;
2623 int pendingPrioritisedExist = 0;
2625 /* First let's see if we need to grab a prioritised block */
2626 if (dev->hasPendingPrioritisedGCs) {
2627 for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
2629 bi = yaffs_GetBlockInfo(dev, i);
2630 /* yaffs_VerifyBlock(dev,bi,i); */
2632 if (bi->gcPrioritise) {
2633 pendingPrioritisedExist = 1;
2634 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2635 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2636 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2639 aggressive = 1; /* Fool the non-aggressive skip logiv below */
2644 if (!pendingPrioritisedExist) /* None found, so we can clear this */
2645 dev->hasPendingPrioritisedGCs = 0;
2648 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2650 * else (we're doing a leasurely gc), then we only bother to do this if the
2651 * block has only a few pages in use.
2654 dev->nonAggressiveSkip--;
2656 if (!aggressive && (dev->nonAggressiveSkip > 0))
2661 (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2665 dev->internalEndBlock - dev->internalStartBlock + 1;
2668 dev->internalEndBlock - dev->internalStartBlock + 1;
2669 iterations = iterations / 16;
2670 if (iterations > 200)
2674 for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2676 if (b < dev->internalStartBlock || b > dev->internalEndBlock)
2677 b = dev->internalStartBlock;
2679 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2680 T(YAFFS_TRACE_ERROR,
2681 (TSTR("**>> Block %d is not valid" TENDSTR), b));
2685 bi = yaffs_GetBlockInfo(dev, b);
2687 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2688 (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2689 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2691 pagesInUse = (bi->pagesInUse - bi->softDeletions);
2695 dev->currentDirtyChecker = b;
2699 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2700 dev->nChunksPerBlock - pagesInUse, prioritised));
2703 dev->oldestDirtySequence = 0;
2706 dev->nonAggressiveSkip = 4;
2711 static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
2713 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2717 /* If the block is still healthy erase it and mark as clean.
2718 * If the block has had a data failure, then retire it.
2721 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2722 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2723 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2725 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2727 if (!bi->needsRetiring) {
2728 yaffs_InvalidateCheckpoint(dev);
2729 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2731 dev->nErasureFailures++;
2732 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2733 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2738 ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2740 for (i = 0; i < dev->nChunksPerBlock; i++) {
2741 if (!yaffs_CheckChunkErased
2742 (dev, blockNo * dev->nChunksPerBlock + i)) {
2743 T(YAFFS_TRACE_ERROR,
2745 (">>Block %d erasure supposedly OK, but chunk %d not erased"
2746 TENDSTR), blockNo, i));
2752 /* Clean it up... */
2753 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2754 dev->nErasedBlocks++;
2756 bi->softDeletions = 0;
2757 bi->hasShrinkHeader = 0;
2758 bi->skipErasedCheck = 1; /* This is clean, so no need to check */
2759 bi->gcPrioritise = 0;
2760 yaffs_ClearChunkBits(dev, blockNo);
2762 T(YAFFS_TRACE_ERASE,
2763 (TSTR("Erased block %d" TENDSTR), blockNo));
2765 dev->nFreeChunks -= dev->nChunksPerBlock; /* We lost a block of free space */
2767 yaffs_RetireBlock(dev, blockNo);
2768 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2769 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2773 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2777 yaffs_BlockInfo *bi;
2779 if (dev->nErasedBlocks < 1) {
2780 /* Hoosterman we've got a problem.
2781 * Can't get space to gc
2783 T(YAFFS_TRACE_ERROR,
2784 (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
2789 /* Find an empty block. */
2791 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2792 dev->allocationBlockFinder++;
2793 if (dev->allocationBlockFinder < dev->internalStartBlock
2794 || dev->allocationBlockFinder > dev->internalEndBlock) {
2795 dev->allocationBlockFinder = dev->internalStartBlock;
2798 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2800 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2801 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2802 dev->sequenceNumber++;
2803 bi->sequenceNumber = dev->sequenceNumber;
2804 dev->nErasedBlocks--;
2805 T(YAFFS_TRACE_ALLOCATE,
2806 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
2807 dev->allocationBlockFinder, dev->sequenceNumber,
2808 dev->nErasedBlocks));
2809 return dev->allocationBlockFinder;
2813 T(YAFFS_TRACE_ALWAYS,
2815 ("yaffs tragedy: no more erased blocks, but there should have been %d"
2816 TENDSTR), dev->nErasedBlocks));
2823 static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
2825 if (!dev->nCheckpointBlocksRequired &&
2827 /* Not a valid value so recalculate */
2830 int devBlocks = (dev->endBlock - dev->startBlock + 1);
2833 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
2835 if (tnodeSize < sizeof(yaffs_Tnode))
2836 tnodeSize = sizeof(yaffs_Tnode);
2838 nBytes += sizeof(yaffs_CheckpointValidity);
2839 nBytes += sizeof(yaffs_CheckpointDevice);
2840 nBytes += devBlocks * sizeof(yaffs_BlockInfo);
2841 nBytes += devBlocks * dev->chunkBitmapStride;
2842 nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
2843 nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
2844 nBytes += sizeof(yaffs_CheckpointValidity);
2845 nBytes += sizeof(__u32); /* checksum*/
2847 /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
2849 nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->nChunksPerBlock)) + 3;
2851 dev->nCheckpointBlocksRequired = nBlocks;
2854 return dev->nCheckpointBlocksRequired;
2858 * Check if there's space to allocate...
2859 * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2861 static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev)
2864 int reservedBlocks = dev->nReservedBlocks;
2865 int checkpointBlocks;
2867 if (dev->isYaffs2) {
2868 checkpointBlocks = yaffs_CalcCheckpointBlocksRequired(dev) -
2869 dev->blocksInCheckpoint;
2870 if (checkpointBlocks < 0)
2871 checkpointBlocks = 0;
2873 checkpointBlocks = 0;
2876 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
2878 return (dev->nFreeChunks > reservedChunks);
2881 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
2882 yaffs_BlockInfo **blockUsedPtr)
2885 yaffs_BlockInfo *bi;
2887 if (dev->allocationBlock < 0) {
2888 /* Get next block to allocate off */
2889 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2890 dev->allocationPage = 0;
2893 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2894 /* Not enough space to allocate unless we're allowed to use the reserve. */
2898 if (dev->nErasedBlocks < dev->nReservedBlocks
2899 && dev->allocationPage == 0) {
2900 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2903 /* Next page please.... */
2904 if (dev->allocationBlock >= 0) {
2905 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2907 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2908 dev->allocationPage;
2910 yaffs_SetChunkBit(dev, dev->allocationBlock,
2911 dev->allocationPage);
2913 dev->allocationPage++;
2917 /* If the block is full set the state to full */
2918 if (dev->allocationPage >= dev->nChunksPerBlock) {
2919 bi->blockState = YAFFS_BLOCK_STATE_FULL;
2920 dev->allocationBlock = -1;
2929 T(YAFFS_TRACE_ERROR,
2930 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2935 static int yaffs_GetErasedChunks(yaffs_Device *dev)
2939 n = dev->nErasedBlocks * dev->nChunksPerBlock;
2941 if (dev->allocationBlock > 0)
2942 n += (dev->nChunksPerBlock - dev->allocationPage);
2948 static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
2954 int retVal = YAFFS_OK;
2957 int isCheckpointBlock;
2961 int chunksBefore = yaffs_GetErasedChunks(dev);
2964 yaffs_ExtendedTags tags;
2966 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2968 yaffs_Object *object;
2970 isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
2973 T(YAFFS_TRACE_TRACING,
2974 (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
2977 bi->hasShrinkHeader,
2980 /*yaffs_VerifyFreeChunks(dev); */
2982 if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
2983 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2985 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
2987 /* Take off the number of soft deleted entries because
2988 * they're going to get really deleted during GC.
2990 if(dev->gcChunk == 0) /* first time through for this block */
2991 dev->nFreeChunks -= bi->softDeletions;
2995 if (isCheckpointBlock ||
2996 !yaffs_StillSomeChunkBits(dev, block)) {
2997 T(YAFFS_TRACE_TRACING,
2999 ("Collecting block %d that has no chunks in use" TENDSTR),
3001 yaffs_BlockBecameDirty(dev, block);
3004 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
3006 yaffs_VerifyBlock(dev, bi, block);
3008 maxCopies = (wholeBlock) ? dev->nChunksPerBlock : 10;
3009 oldChunk = block * dev->nChunksPerBlock + dev->gcChunk;
3011 for (/* init already done */;
3012 retVal == YAFFS_OK &&
3013 dev->gcChunk < dev->nChunksPerBlock &&
3014 (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
3016 dev->gcChunk++, oldChunk++) {
3017 if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
3019 /* This page is in use and might need to be copied off */
3025 yaffs_InitialiseTags(&tags);
3027 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
3031 yaffs_FindObjectByNumber(dev,
3034 T(YAFFS_TRACE_GC_DETAIL,
3036 ("Collecting chunk in block %d, %d %d %d " TENDSTR),
3037 dev->gcChunk, tags.objectId, tags.chunkId,
3040 if (object && !yaffs_SkipVerification(dev)) {
3041 if (tags.chunkId == 0)
3042 matchingChunk = object->hdrChunk;
3043 else if (object->softDeleted)
3044 matchingChunk = oldChunk; /* Defeat the test */
3046 matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
3048 if (oldChunk != matchingChunk)
3049 T(YAFFS_TRACE_ERROR,
3050 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
3051 oldChunk, matchingChunk, tags.objectId, tags.chunkId));
3056 T(YAFFS_TRACE_ERROR,
3058 ("page %d in gc has no object: %d %d %d "
3060 tags.objectId, tags.chunkId, tags.byteCount));
3065 object->softDeleted &&
3066 tags.chunkId != 0) {
3067 /* Data chunk in a soft deleted file, throw it away
3068 * It's a soft deleted data chunk,
3069 * No need to copy this, just forget about it and
3070 * fix up the object.
3073 object->nDataChunks--;
3075 if (object->nDataChunks <= 0) {
3076 /* remeber to clean up the object */
3077 dev->gcCleanupList[cleanups] =
3083 /* Todo object && object->deleted && object->nDataChunks == 0 */
3084 /* Deleted object header with no data chunks.
3085 * Can be discarded and the file deleted.
3087 object->hdrChunk = 0;
3088 yaffs_FreeTnode(object->myDev,
3091 object->variant.fileVariant.top = NULL;
3092 yaffs_DoGenericObjectDeletion(object);
3094 } else if (object) {
3095 /* It's either a data chunk in a live file or
3096 * an ObjectHeader, so we're interested in it.
3097 * NB Need to keep the ObjectHeaders of deleted files
3098 * until the whole file has been deleted off
3100 tags.serialNumber++;
3104 if (tags.chunkId == 0) {
3105 /* It is an object Id,
3106 * We need to nuke the shrinkheader flags first
3107 * We no longer want the shrinkHeader flag since its work is done
3108 * and if it is left in place it will mess up scanning.
3111 yaffs_ObjectHeader *oh;
3112 oh = (yaffs_ObjectHeader *)buffer;
3114 tags.extraIsShrinkHeader = 0;
3116 yaffs_VerifyObjectHeader(object, oh, &tags, 1);
3120 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3123 retVal = YAFFS_FAIL;
3126 /* Ok, now fix up the Tnodes etc. */
3128 if (tags.chunkId == 0) {
3130 object->hdrChunk = newChunk;
3131 object->serial = tags.serialNumber;
3133 /* It's a data chunk */
3134 yaffs_PutChunkIntoFile
3142 if (retVal == YAFFS_OK)
3143 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3148 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3151 /* Do any required cleanups */
3152 for (i = 0; i < cleanups; i++) {
3153 /* Time to delete the file too */
3155 yaffs_FindObjectByNumber(dev,
3156 dev->gcCleanupList[i]);
3158 yaffs_FreeTnode(dev,
3159 object->variant.fileVariant.
3161 object->variant.fileVariant.top = NULL;
3164 ("yaffs: About to finally delete object %d"
3165 TENDSTR), object->objectId));
3166 yaffs_DoGenericObjectDeletion(object);
3167 object->myDev->nDeletedFiles--;
3174 yaffs_VerifyCollectedBlock(dev, bi, block);
3176 chunksAfter = yaffs_GetErasedChunks(dev);
3177 if (chunksBefore >= chunksAfter) {
3180 ("gc did not increase free chunks before %d after %d"
3181 TENDSTR), chunksBefore, chunksAfter));
3184 /* If the gc completed then clear the current gcBlock so that we find another. */
3185 if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
3195 /* New garbage collector
3196 * If we're very low on erased blocks then we do aggressive garbage collection
3197 * otherwise we do "leasurely" garbage collection.
3198 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3199 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3201 * The idea is to help clear out space in a more spread-out manner.
3202 * Dunno if it really does anything useful.
3204 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
3208 int gcOk = YAFFS_OK;
3211 int checkpointBlockAdjust;
3213 if (dev->isDoingGC) {
3214 /* Bail out so we don't get recursive gc */
3218 /* This loop should pass the first time.
3219 * We'll only see looping here if the erase of the collected block fails.
3225 checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
3226 if (checkpointBlockAdjust < 0)
3227 checkpointBlockAdjust = 0;
3229 if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
3230 /* We need a block soon...*/
3233 /* We're in no hurry */
3237 if (dev->gcBlock <= 0) {
3238 dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3242 block = dev->gcBlock;
3245 dev->garbageCollections++;
3247 dev->passiveGarbageCollections++;
3251 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3252 dev->nErasedBlocks, aggressive));
3254 gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
3257 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
3260 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3261 TENDSTR), dev->nErasedBlocks, maxTries, block));
3263 } while ((dev->nErasedBlocks < dev->nReservedBlocks) &&
3267 return aggressive ? gcOk : YAFFS_OK;
3270 /*------------------------- TAGS --------------------------------*/
3272 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
3275 return (tags->chunkId == chunkInObject &&
3276 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3281 /*-------------------- Data file manipulation -----------------*/
3283 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
3284 yaffs_ExtendedTags *tags)
3286 /*Get the Tnode, then get the level 0 offset chunk offset */
3289 yaffs_ExtendedTags localTags;
3292 yaffs_Device *dev = in->myDev;
3295 /* Passed a NULL, so use our own tags space */
3299 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3302 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3305 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3311 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
3312 yaffs_ExtendedTags *tags)
3314 /* Get the Tnode, then get the level 0 offset chunk offset */
3317 yaffs_ExtendedTags localTags;
3319 yaffs_Device *dev = in->myDev;
3323 /* Passed a NULL, so use our own tags space */
3327 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3331 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3334 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3337 /* Delete the entry in the filestructure (if found) */
3339 yaffs_PutLevel0Tnode(dev, tn, chunkInInode, 0);
3345 #ifdef YAFFS_PARANOID
3347 static int yaffs_CheckFileSanity(yaffs_Object *in)
3355 yaffs_Tags localTags;
3356 yaffs_Tags *tags = &localTags;
3360 if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
3363 objId = in->objectId;
3364 fSize = in->variant.fileVariant.fileSize;
3366 (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3368 for (chunk = 1; chunk <= nChunks; chunk++) {
3369 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3374 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
3376 if (yaffs_CheckChunkBits
3377 (dev, theChunk / dev->nChunksPerBlock,
3378 theChunk % dev->nChunksPerBlock)) {
3380 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3384 (tags, in->objectId, chunk, chunkDeleted)) {
3394 /* T(("No level 0 found for %d\n", chunk)); */
3398 return failed ? YAFFS_FAIL : YAFFS_OK;
3403 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
3404 int chunkInNAND, int inScan)
3406 /* NB inScan is zero unless scanning.
3407 * For forward scanning, inScan is > 0;
3408 * for backward scanning inScan is < 0
3412 yaffs_Device *dev = in->myDev;
3414 yaffs_ExtendedTags existingTags;
3415 yaffs_ExtendedTags newTags;
3416 unsigned existingSerial, newSerial;
3418 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3419 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3420 * If it is not during Scanning then something went wrong!
3423 T(YAFFS_TRACE_ERROR,
3425 ("yaffs tragedy:attempt to put data chunk into a non-file"
3430 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3434 tn = yaffs_AddOrFindLevel0Tnode(dev,
3435 &in->variant.fileVariant,
3441 existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3444 /* If we're scanning then we need to test for duplicates
3445 * NB This does not need to be efficient since it should only ever
3446 * happen when the power fails during a write, then only one
3447 * chunk should ever be affected.
3449 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3450 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3453 if (existingChunk > 0) {
3454 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3455 * thus we have to do a FindChunkInFile to get the real chunk id.
3457 * We have a duplicate now we need to decide which one to use:
3459 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3460 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3461 * YAFFS1: Get both sets of tags and compare serial numbers.
3465 /* Only do this for forward scanning */
3466 yaffs_ReadChunkWithTagsFromNAND(dev,
3470 /* Do a proper find */
3472 yaffs_FindChunkInFile(in, chunkInInode,
3476 if (existingChunk <= 0) {
3477 /*Hoosterman - how did this happen? */
3479 T(YAFFS_TRACE_ERROR,
3481 ("yaffs tragedy: existing chunk < 0 in scan"
3486 /* NB The deleted flags should be false, otherwise the chunks will
3487 * not be loaded during a scan
3491 newSerial = newTags.serialNumber;
3492 existingSerial = existingTags.serialNumber;
3496 (in->myDev->isYaffs2 ||
3497 existingChunk <= 0 ||
3498 ((existingSerial + 1) & 3) == newSerial)) {
3499 /* Forward scanning.
3501 * Delete the old one and drop through to update the tnode
3503 yaffs_DeleteChunk(dev, existingChunk, 1,
3506 /* Backward scanning or we want to use the existing one
3508 * Delete the new one and return early so that the tnode isn't changed
3510 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3518 if (existingChunk == 0)
3521 yaffs_PutLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
3526 static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
3529 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3531 if (chunkInNAND >= 0)
3532 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3535 T(YAFFS_TRACE_NANDACCESS,
3536 (TSTR("Chunk %d not found zero instead" TENDSTR),
3538 /* get sane (zero) data if you read a hole */
3539 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3545 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
3549 yaffs_ExtendedTags tags;
3550 yaffs_BlockInfo *bi;
3556 block = chunkId / dev->nChunksPerBlock;
3557 page = chunkId % dev->nChunksPerBlock;
3560 if (!yaffs_CheckChunkBit(dev, block, page))
3561 T(YAFFS_TRACE_VERIFY,
3562 (TSTR("Deleting invalid chunk %d"TENDSTR),
3565 bi = yaffs_GetBlockInfo(dev, block);
3567 T(YAFFS_TRACE_DELETION,
3568 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3571 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
3573 yaffs_InitialiseTags(&tags);
3575 tags.chunkDeleted = 1;
3577 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3578 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3580 dev->nUnmarkedDeletions++;
3583 /* Pull out of the management area.
3584 * If the whole block became dirty, this will kick off an erasure.
3586 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3587 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3588 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3589 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3592 yaffs_ClearChunkBit(dev, block, page);
3596 if (bi->pagesInUse == 0 &&
3597 !bi->hasShrinkHeader &&
3598 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3599 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3600 yaffs_BlockBecameDirty(dev, block);
3607 static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
3608 const __u8 *buffer, int nBytes,
3611 /* Find old chunk Need to do this to get serial number
3612 * Write new one and patch into tree.
3613 * Invalidate old tags.
3617 yaffs_ExtendedTags prevTags;
3620 yaffs_ExtendedTags newTags;
3622 yaffs_Device *dev = in->myDev;
3624 yaffs_CheckGarbageCollection(dev);
3626 /* Get the previous chunk at this location in the file if it exists */
3627 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3629 /* Set up new tags */
3630 yaffs_InitialiseTags(&newTags);
3632 newTags.chunkId = chunkInInode;
3633 newTags.objectId = in->objectId;
3634 newTags.serialNumber =
3635 (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
3636 newTags.byteCount = nBytes;
3638 if (nBytes < 1 || nBytes > dev->totalBytesPerChunk) {
3639 T(YAFFS_TRACE_ERROR,
3640 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
3645 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3648 if (newChunkId >= 0) {
3649 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3651 if (prevChunkId > 0)
3652 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3654 yaffs_CheckFileSanity(in);
3660 /* UpdateObjectHeader updates the header on NAND for an object.
3661 * If name is not NULL, then that new name is used.
3663 int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
3664 int isShrink, int shadows)
3667 yaffs_BlockInfo *bi;
3669 yaffs_Device *dev = in->myDev;
3676 yaffs_ExtendedTags newTags;
3677 yaffs_ExtendedTags oldTags;
3679 __u8 *buffer = NULL;
3680 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3682 yaffs_ObjectHeader *oh = NULL;
3684 yaffs_strcpy(oldName, _Y("silly old name"));
3688 in == dev->rootDir || /* The rootDir should also be saved */
3691 yaffs_CheckGarbageCollection(dev);
3692 yaffs_CheckObjectDetailsLoaded(in);
3694 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3695 oh = (yaffs_ObjectHeader *) buffer;
3697 prevChunkId = in->hdrChunk;
3699 if (prevChunkId > 0) {
3700 result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3703 yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
3705 memcpy(oldName, oh->name, sizeof(oh->name));
3708 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3710 oh->type = in->variantType;
3711 oh->yst_mode = in->yst_mode;
3712 oh->shadowsObject = oh->inbandShadowsObject = shadows;
3714 #ifdef CONFIG_YAFFS_WINCE
3715 oh->win_atime[0] = in->win_atime[0];
3716 oh->win_ctime[0] = in->win_ctime[0];
3717 oh->win_mtime[0] = in->win_mtime[0];
3718 oh->win_atime[1] = in->win_atime[1];
3719 oh->win_ctime[1] = in->win_ctime[1];
3720 oh->win_mtime[1] = in->win_mtime[1];
3722 oh->yst_uid = in->yst_uid;
3723 oh->yst_gid = in->yst_gid;
3724 oh->yst_atime = in->yst_atime;
3725 oh->yst_mtime = in->yst_mtime;
3726 oh->yst_ctime = in->yst_ctime;
3727 oh->yst_rdev = in->yst_rdev;
3730 oh->parentObjectId = in->parent->objectId;
3732 oh->parentObjectId = 0;
3734 if (name && *name) {
3735 memset(oh->name, 0, sizeof(oh->name));
3736 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3737 } else if (prevChunkId > 0)
3738 memcpy(oh->name, oldName, sizeof(oh->name));
3740 memset(oh->name, 0, sizeof(oh->name));
3742 oh->isShrink = isShrink;
3744 switch (in->variantType) {
3745 case YAFFS_OBJECT_TYPE_UNKNOWN:
3746 /* Should not happen */
3748 case YAFFS_OBJECT_TYPE_FILE:
3750 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3751 || oh->parentObjectId ==
3752 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3753 fileVariant.fileSize;
3755 case YAFFS_OBJECT_TYPE_HARDLINK:
3756 oh->equivalentObjectId =
3757 in->variant.hardLinkVariant.equivalentObjectId;
3759 case YAFFS_OBJECT_TYPE_SPECIAL:
3762 case YAFFS_OBJECT_TYPE_DIRECTORY:
3765 case YAFFS_OBJECT_TYPE_SYMLINK:
3766 yaffs_strncpy(oh->alias,
3767 in->variant.symLinkVariant.alias,
3768 YAFFS_MAX_ALIAS_LENGTH);
3769 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3774 yaffs_InitialiseTags(&newTags);
3776 newTags.chunkId = 0;
3777 newTags.objectId = in->objectId;
3778 newTags.serialNumber = in->serial;
3780 /* Add extra info for file header */
3782 newTags.extraHeaderInfoAvailable = 1;
3783 newTags.extraParentObjectId = oh->parentObjectId;
3784 newTags.extraFileLength = oh->fileSize;
3785 newTags.extraIsShrinkHeader = oh->isShrink;
3786 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3787 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3788 newTags.extraObjectType = in->variantType;
3790 yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
3792 /* Create new chunk in NAND */
3794 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3795 (prevChunkId > 0) ? 1 : 0);
3797 if (newChunkId >= 0) {
3799 in->hdrChunk = newChunkId;
3801 if (prevChunkId > 0) {
3802 yaffs_DeleteChunk(dev, prevChunkId, 1,
3806 if (!yaffs_ObjectHasCachedWriteData(in))
3809 /* If this was a shrink, then mark the block that the chunk lives on */
3811 bi = yaffs_GetBlockInfo(in->myDev,
3812 newChunkId / in->myDev->nChunksPerBlock);
3813 bi->hasShrinkHeader = 1;
3818 retVal = newChunkId;
3823 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3828 /*------------------------ Short Operations Cache ----------------------------------------
3829 * In many situations where there is no high level buffering (eg WinCE) a lot of
3830 * reads might be short sequential reads, and a lot of writes may be short
3831 * sequential writes. eg. scanning/writing a jpeg file.
3832 * In these cases, a short read/write cache can provide a huge perfomance benefit
3833 * with dumb-as-a-rock code.
3834 * In Linux, the page cache provides read buffering aand the short op cache provides write
3837 * There are a limited number (~10) of cache chunks per device so that we don't
3838 * need a very intelligent search.
3841 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3843 yaffs_Device *dev = obj->myDev;
3845 yaffs_ChunkCache *cache;
3846 int nCaches = obj->myDev->nShortOpCaches;
3848 for (i = 0; i < nCaches; i++) {
3849 cache = &dev->srCache[i];
3850 if (cache->object == obj &&
3859 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
3861 yaffs_Device *dev = obj->myDev;
3862 int lowest = -99; /* Stop compiler whining. */
3864 yaffs_ChunkCache *cache;
3865 int chunkWritten = 0;
3866 int nCaches = obj->myDev->nShortOpCaches;
3872 /* Find the dirty cache for this object with the lowest chunk id. */
3873 for (i = 0; i < nCaches; i++) {
3874 if (dev->srCache[i].object == obj &&
3875 dev->srCache[i].dirty) {
3877 || dev->srCache[i].chunkId <
3879 cache = &dev->srCache[i];
3880 lowest = cache->chunkId;
3885 if (cache && !cache->locked) {
3886 /* Write it out and free it up */
3889 yaffs_WriteChunkDataToObject(cache->object,
3895 cache->object = NULL;
3898 } while (cache && chunkWritten > 0);
3901 /* Hoosterman, disk full while writing cache out. */
3902 T(YAFFS_TRACE_ERROR,
3903 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3910 /*yaffs_FlushEntireDeviceCache(dev)
3915 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
3918 int nCaches = dev->nShortOpCaches;
3921 /* Find a dirty object in the cache and flush it...
3922 * until there are no further dirty objects.
3926 for (i = 0; i < nCaches && !obj; i++) {
3927 if (dev->srCache[i].object &&
3928 dev->srCache[i].dirty)
3929 obj = dev->srCache[i].object;
3933 yaffs_FlushFilesChunkCache(obj);
3940 /* Grab us a cache chunk for use.
3941 * First look for an empty one.
3942 * Then look for the least recently used non-dirty one.
3943 * Then look for the least recently used dirty one...., flush and look again.
3945 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
3949 if (dev->nShortOpCaches > 0) {
3950 for (i = 0; i < dev->nShortOpCaches; i++) {
3951 if (!dev->srCache[i].object)
3952 return &dev->srCache[i];
3959 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
3961 yaffs_ChunkCache *cache;
3962 yaffs_Object *theObj;
3967 if (dev->nShortOpCaches > 0) {
3968 /* Try find a non-dirty one... */
3970 cache = yaffs_GrabChunkCacheWorker(dev);
3973 /* They were all dirty, find the last recently used object and flush
3974 * its cache, then find again.
3975 * NB what's here is not very accurate, we actually flush the object
3976 * the last recently used page.
3979 /* With locking we can't assume we can use entry zero */
3986 for (i = 0; i < dev->nShortOpCaches; i++) {
3987 if (dev->srCache[i].object &&
3988 !dev->srCache[i].locked &&
3989 (dev->srCache[i].lastUse < usage || !cache)) {
3990 usage = dev->srCache[i].lastUse;
3991 theObj = dev->srCache[i].object;
3992 cache = &dev->srCache[i];
3997 if (!cache || cache->dirty) {
3998 /* Flush and try again */
3999 yaffs_FlushFilesChunkCache(theObj);
4000 cache = yaffs_GrabChunkCacheWorker(dev);
4010 /* Find a cached chunk */
4011 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
4014 yaffs_Device *dev = obj->myDev;
4016 if (dev->nShortOpCaches > 0) {
4017 for (i = 0; i < dev->nShortOpCaches; i++) {
4018 if (dev->srCache[i].object == obj &&
4019 dev->srCache[i].chunkId == chunkId) {
4022 return &dev->srCache[i];
4029 /* Mark the chunk for the least recently used algorithym */
4030 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
4034 if (dev->nShortOpCaches > 0) {
4035 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
4036 /* Reset the cache usages */
4038 for (i = 1; i < dev->nShortOpCaches; i++)
4039 dev->srCache[i].lastUse = 0;
4046 cache->lastUse = dev->srLastUse;
4053 /* Invalidate a single cache page.
4054 * Do this when a whole page gets written,
4055 * ie the short cache for this page is no longer valid.
4057 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
4059 if (object->myDev->nShortOpCaches > 0) {
4060 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4063 cache->object = NULL;
4067 /* Invalidate all the cache pages associated with this object
4068 * Do this whenever ther file is deleted or resized.
4070 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
4073 yaffs_Device *dev = in->myDev;
4075 if (dev->nShortOpCaches > 0) {
4076 /* Invalidate it. */
4077 for (i = 0; i < dev->nShortOpCaches; i++) {
4078 if (dev->srCache[i].object == in)
4079 dev->srCache[i].object = NULL;
4084 /*--------------------- Checkpointing --------------------*/
4087 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
4089 yaffs_CheckpointValidity cp;
4091 memset(&cp, 0, sizeof(cp));
4093 cp.structType = sizeof(cp);
4094 cp.magic = YAFFS_MAGIC;
4095 cp.version = YAFFS_CHECKPOINT_VERSION;
4096 cp.head = (head) ? 1 : 0;
4098 return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
4102 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4104 yaffs_CheckpointValidity cp;
4107 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4110 ok = (cp.structType == sizeof(cp)) &&
4111 (cp.magic == YAFFS_MAGIC) &&
4112 (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4113 (cp.head == ((head) ? 1 : 0));
4117 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4120 cp->nErasedBlocks = dev->nErasedBlocks;
4121 cp->allocationBlock = dev->allocationBlock;
4122 cp->allocationPage = dev->allocationPage;
4123 cp->nFreeChunks = dev->nFreeChunks;
4125 cp->nDeletedFiles = dev->nDeletedFiles;
4126 cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4127 cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4128 cp->sequenceNumber = dev->sequenceNumber;
4129 cp->oldestDirtySequence = dev->oldestDirtySequence;
4133 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4134 yaffs_CheckpointDevice *cp)
4136 dev->nErasedBlocks = cp->nErasedBlocks;
4137 dev->allocationBlock = cp->allocationBlock;
4138 dev->allocationPage = cp->allocationPage;
4139 dev->nFreeChunks = cp->nFreeChunks;
4141 dev->nDeletedFiles = cp->nDeletedFiles;
4142 dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4143 dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4144 dev->sequenceNumber = cp->sequenceNumber;
4145 dev->oldestDirtySequence = cp->oldestDirtySequence;
4149 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4151 yaffs_CheckpointDevice cp;
4153 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4157 /* Write device runtime values*/
4158 yaffs_DeviceToCheckpointDevice(&cp, dev);
4159 cp.structType = sizeof(cp);
4161 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4163 /* Write block info */
4165 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4166 ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
4169 /* Write chunk bits */
4171 nBytes = nBlocks * dev->chunkBitmapStride;
4172 ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
4178 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4180 yaffs_CheckpointDevice cp;
4182 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4186 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4190 if (cp.structType != sizeof(cp))
4194 yaffs_CheckpointDeviceToDevice(dev, &cp);
4196 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4198 ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
4202 nBytes = nBlocks * dev->chunkBitmapStride;
4204 ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
4209 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4213 cp->objectId = obj->objectId;
4214 cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4215 cp->hdrChunk = obj->hdrChunk;
4216 cp->variantType = obj->variantType;
4217 cp->deleted = obj->deleted;
4218 cp->softDeleted = obj->softDeleted;
4219 cp->unlinked = obj->unlinked;
4220 cp->fake = obj->fake;
4221 cp->renameAllowed = obj->renameAllowed;
4222 cp->unlinkAllowed = obj->unlinkAllowed;
4223 cp->serial = obj->serial;
4224 cp->nDataChunks = obj->nDataChunks;
4226 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4227 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4228 else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4229 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4232 static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
4235 yaffs_Object *parent;
4237 if (obj->variantType != cp->variantType) {
4238 T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
4239 TCONT("chunk %d does not match existing object type %d")
4240 TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
4245 obj->objectId = cp->objectId;
4248 parent = yaffs_FindOrCreateObjectByNumber(
4251 YAFFS_OBJECT_TYPE_DIRECTORY);
4256 if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4257 T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
4258 TCONT(" chunk %d Parent type, %d, not directory")
4260 cp->objectId, cp->parentId, cp->variantType,
4261 cp->hdrChunk, parent->variantType));
4264 yaffs_AddObjectToDirectory(parent, obj);
4267 obj->hdrChunk = cp->hdrChunk;
4268 obj->variantType = cp->variantType;
4269 obj->deleted = cp->deleted;
4270 obj->softDeleted = cp->softDeleted;
4271 obj->unlinked = cp->unlinked;
4272 obj->fake = cp->fake;
4273 obj->renameAllowed = cp->renameAllowed;
4274 obj->unlinkAllowed = cp->unlinkAllowed;
4275 obj->serial = cp->serial;
4276 obj->nDataChunks = cp->nDataChunks;
4278 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4279 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4280 else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4281 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4283 if (obj->hdrChunk > 0)
4284 obj->lazyLoaded = 1;
4290 static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
4291 __u32 level, int chunkOffset)
4294 yaffs_Device *dev = in->myDev;
4296 int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4298 if (tnodeSize < sizeof(yaffs_Tnode))
4299 tnodeSize = sizeof(yaffs_Tnode);
4305 for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
4306 if (tn->internal[i]) {
4307 ok = yaffs_CheckpointTnodeWorker(in,
4310 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4313 } else if (level == 0) {
4314 __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
4315 ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
4317 ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
4325 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4327 __u32 endMarker = ~0;
4330 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4331 ok = yaffs_CheckpointTnodeWorker(obj,
4332 obj->variant.fileVariant.top,
4333 obj->variant.fileVariant.topLevel,
4336 ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
4343 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4347 yaffs_Device *dev = obj->myDev;
4348 yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4351 int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4353 if (tnodeSize < sizeof(yaffs_Tnode))
4354 tnodeSize = sizeof(yaffs_Tnode);
4356 ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4358 while (ok && (~baseChunk)) {
4360 /* Read level 0 tnode */
4363 tn = yaffs_GetTnodeRaw(dev);
4365 ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
4370 ok = yaffs_AddOrFindLevel0Tnode(dev,
4376 ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4380 T(YAFFS_TRACE_CHECKPOINT, (
4381 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4382 nread, baseChunk, ok));
4388 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4391 yaffs_CheckpointObject cp;
4394 struct ylist_head *lh;
4397 /* Iterate through the objects in each hash entry,
4398 * dumping them to the checkpointing stream.
4401 for (i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++) {
4402 ylist_for_each(lh, &dev->objectBucket[i].list) {
4404 obj = ylist_entry(lh, yaffs_Object, hashLink);
4405 if (!obj->deferedFree) {
4406 yaffs_ObjectToCheckpointObject(&cp, obj);
4407 cp.structType = sizeof(cp);
4409 T(YAFFS_TRACE_CHECKPOINT, (
4410 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
4411 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, (unsigned) obj));
4413 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4415 if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4416 ok = yaffs_WriteCheckpointTnodes(obj);
4422 /* Dump end of list */
4423 memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
4424 cp.structType = sizeof(cp);
4427 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4432 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4435 yaffs_CheckpointObject cp;
4438 yaffs_Object *hardList = NULL;
4440 while (ok && !done) {
4441 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4442 if (cp.structType != sizeof(cp)) {
4443 T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
4444 cp.structType, sizeof(cp), ok));
4448 T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4449 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
4451 if (ok && cp.objectId == ~0)
4454 obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
4456 ok = yaffs_CheckpointObjectToObject(obj, &cp);
4459 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4460 ok = yaffs_ReadCheckpointTnodes(obj);
4461 } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4462 obj->hardLinks.next =
4463 (struct ylist_head *) hardList;
4472 yaffs_HardlinkFixup(dev, hardList);
4477 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4479 __u32 checkpointSum;
4482 yaffs_GetCheckpointSum(dev, &checkpointSum);
4484 ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
4492 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4494 __u32 checkpointSum0;
4495 __u32 checkpointSum1;
4498 yaffs_GetCheckpointSum(dev, &checkpointSum0);
4500 ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4505 if (checkpointSum0 != checkpointSum1)
4512 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4516 if (dev->skipCheckpointWrite || !dev->isYaffs2) {
4517 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
4522 ok = yaffs_CheckpointOpen(dev, 1);
4525 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4526 ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
4529 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
4530 ok = yaffs_WriteCheckpointDevice(dev);
4533 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
4534 ok = yaffs_WriteCheckpointObjects(dev);
4537 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4538 ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
4542 ok = yaffs_WriteCheckpointSum(dev);
4544 if (!yaffs_CheckpointClose(dev))
4548 dev->isCheckpointed = 1;
4550 dev->isCheckpointed = 0;
4552 return dev->isCheckpointed;
4555 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4559 if (dev->skipCheckpointRead || !dev->isYaffs2) {
4560 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
4565 ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
4568 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4569 ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
4572 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
4573 ok = yaffs_ReadCheckpointDevice(dev);
4576 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
4577 ok = yaffs_ReadCheckpointObjects(dev);
4580 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4581 ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
4585 ok = yaffs_ReadCheckpointSum(dev);
4586 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
4589 if (!yaffs_CheckpointClose(dev))
4593 dev->isCheckpointed = 1;
4595 dev->isCheckpointed = 0;
4601 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4603 if (dev->isCheckpointed ||
4604 dev->blocksInCheckpoint > 0) {
4605 dev->isCheckpointed = 0;
4606 yaffs_CheckpointInvalidateStream(dev);
4607 if (dev->superBlock && dev->markSuperBlockDirty)
4608 dev->markSuperBlockDirty(dev->superBlock);
4613 int yaffs_CheckpointSave(yaffs_Device *dev)
4616 T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4618 yaffs_VerifyObjects(dev);
4619 yaffs_VerifyBlocks(dev);
4620 yaffs_VerifyFreeChunks(dev);
4622 if (!dev->isCheckpointed) {
4623 yaffs_InvalidateCheckpoint(dev);
4624 yaffs_WriteCheckpointData(dev);
4627 T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4629 return dev->isCheckpointed;
4632 int yaffs_CheckpointRestore(yaffs_Device *dev)
4635 T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4637 retval = yaffs_ReadCheckpointData(dev);
4639 if (dev->isCheckpointed) {
4640 yaffs_VerifyObjects(dev);
4641 yaffs_VerifyBlocks(dev);
4642 yaffs_VerifyFreeChunks(dev);
4645 T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4650 /*--------------------- File read/write ------------------------
4651 * Read and write have very similar structures.
4652 * In general the read/write has three parts to it
4653 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4654 * Some complete chunks
4655 * An incomplete chunk to end off with
4657 * Curve-balls: the first chunk might also be the last chunk.
4660 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
4669 yaffs_ChunkCache *cache;
4676 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4677 /* start = offset % dev->nDataBytesPerChunk; */
4678 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4681 /* OK now check for the curveball where the start and end are in
4684 if ((start + n) < dev->nDataBytesPerChunk)
4687 nToCopy = dev->nDataBytesPerChunk - start;
4689 cache = yaffs_FindChunkCache(in, chunk);
4691 /* If the chunk is already in the cache or it is less than a whole chunk
4692 * or we're using inband tags then use the cache (if there is caching)
4693 * else bypass the cache.
4695 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4696 if (dev->nShortOpCaches > 0) {
4698 /* If we can't find the data in the cache, then load it up. */
4701 cache = yaffs_GrabChunkCache(in->myDev);
4703 cache->chunkId = chunk;
4706 yaffs_ReadChunkDataFromObject(in, chunk,
4712 yaffs_UseChunkCache(dev, cache, 0);
4717 memcpy(buffer, &cache->data[start], nToCopy);
4721 /* Read into the local buffer then copy..*/
4724 yaffs_GetTempBuffer(dev, __LINE__);
4725 yaffs_ReadChunkDataFromObject(in, chunk,
4728 memcpy(buffer, &localBuffer[start], nToCopy);
4731 yaffs_ReleaseTempBuffer(dev, localBuffer,
4737 /* A full chunk. Read directly into the supplied buffer. */
4738 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4752 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
4753 int nBytes, int writeThrough)
4762 int startOfWrite = offset;
4763 int chunkWritten = 0;
4771 while (n > 0 && chunkWritten >= 0) {
4772 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4773 /* start = offset % dev->nDataBytesPerChunk; */
4774 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4776 if (chunk * dev->nDataBytesPerChunk + start != offset ||
4777 start >= dev->nDataBytesPerChunk) {
4778 T(YAFFS_TRACE_ERROR, (
4779 TSTR("AddrToChunk of offset %d gives chunk %d start %d"
4781 (int)offset, chunk, start));
4785 /* OK now check for the curveball where the start and end are in
4789 if ((start + n) < dev->nDataBytesPerChunk) {
4792 /* Now folks, to calculate how many bytes to write back....
4793 * If we're overwriting and not writing to then end of file then
4794 * we need to write back as much as was there before.
4797 chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
4799 if (chunkStart > in->variant.fileVariant.fileSize)
4800 nBytesRead = 0; /* Past end of file */
4802 nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
4804 if (nBytesRead > dev->nDataBytesPerChunk)
4805 nBytesRead = dev->nDataBytesPerChunk;
4809 (start + n)) ? nBytesRead : (start + n);
4811 if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
4815 nToCopy = dev->nDataBytesPerChunk - start;
4816 nToWriteBack = dev->nDataBytesPerChunk;
4819 if (nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4820 /* An incomplete start or end chunk (or maybe both start and end chunk),
4821 * or we're using inband tags, so we want to use the cache buffers.
4823 if (dev->nShortOpCaches > 0) {
4824 yaffs_ChunkCache *cache;
4825 /* If we can't find the data in the cache, then load the cache */
4826 cache = yaffs_FindChunkCache(in, chunk);
4829 && yaffs_CheckSpaceForAllocation(in->
4831 cache = yaffs_GrabChunkCache(in->myDev);
4833 cache->chunkId = chunk;
4836 yaffs_ReadChunkDataFromObject(in, chunk,
4841 !yaffs_CheckSpaceForAllocation(in->myDev)) {
4842 /* Drop the cache if it was a read cache item and
4843 * no space check has been made for it.
4849 yaffs_UseChunkCache(dev, cache, 1);
4853 memcpy(&cache->data[start], buffer,
4858 cache->nBytes = nToWriteBack;
4862 yaffs_WriteChunkDataToObject
4865 cache->data, cache->nBytes,
4871 chunkWritten = -1; /* fail the write */
4874 /* An incomplete start or end chunk (or maybe both start and end chunk)
4875 * Read into the local buffer then copy, then copy over and write back.
4879 yaffs_GetTempBuffer(dev, __LINE__);
4881 yaffs_ReadChunkDataFromObject(in, chunk,
4886 memcpy(&localBuffer[start], buffer, nToCopy);
4889 yaffs_WriteChunkDataToObject(in, chunk,
4894 yaffs_ReleaseTempBuffer(dev, localBuffer,
4900 /* A full chunk. Write directly from the supplied buffer. */
4905 yaffs_WriteChunkDataToObject(in, chunk, buffer,
4906 dev->nDataBytesPerChunk,
4909 /* Since we've overwritten the cached data, we better invalidate it. */
4910 yaffs_InvalidateChunkCache(in, chunk);
4913 if (chunkWritten >= 0) {
4922 /* Update file object */
4924 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
4925 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
4933 /* ---------------------- File resizing stuff ------------------ */
4935 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
4938 yaffs_Device *dev = in->myDev;
4939 int oldFileSize = in->variant.fileVariant.fileSize;
4941 int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
4943 int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
4944 dev->nDataBytesPerChunk;
4948 /* Delete backwards so that we don't end up with holes if
4949 * power is lost part-way through the operation.
4951 for (i = lastDel; i >= startDel; i--) {
4952 /* NB this could be optimised somewhat,
4953 * eg. could retrieve the tags and write them without
4954 * using yaffs_DeleteChunk
4957 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
4960 (dev->internalStartBlock * dev->nChunksPerBlock)
4962 ((dev->internalEndBlock +
4963 1) * dev->nChunksPerBlock)) {
4964 T(YAFFS_TRACE_ALWAYS,
4965 (TSTR("Found daft chunkId %d for %d" TENDSTR),
4969 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
4976 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
4979 int oldFileSize = in->variant.fileVariant.fileSize;
4980 __u32 newSizeOfPartialChunk;
4983 yaffs_Device *dev = in->myDev;
4985 yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
4987 yaffs_FlushFilesChunkCache(in);
4988 yaffs_InvalidateWholeChunkCache(in);
4990 yaffs_CheckGarbageCollection(dev);
4992 if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
4995 if (newSize == oldFileSize)
4998 if (newSize < oldFileSize) {
5000 yaffs_PruneResizedChunks(in, newSize);
5002 if (newSizeOfPartialChunk != 0) {
5003 int lastChunk = 1 + newFullChunks;
5005 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
5007 /* Got to read and rewrite the last chunk with its new size and zero pad */
5008 yaffs_ReadChunkDataFromObject(in, lastChunk,
5011 memset(localBuffer + newSizeOfPartialChunk, 0,
5012 dev->nDataBytesPerChunk - newSizeOfPartialChunk);
5014 yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
5015 newSizeOfPartialChunk, 1);
5017 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
5020 in->variant.fileVariant.fileSize = newSize;
5022 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
5024 /* newsSize > oldFileSize */
5025 in->variant.fileVariant.fileSize = newSize;
5029 /* Write a new object header.
5030 * show we've shrunk the file, if need be
5031 * Do this only if the file is not in the deleted directories.
5034 in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5035 in->parent->objectId != YAFFS_OBJECTID_DELETED)
5036 yaffs_UpdateObjectHeader(in, NULL, 0,
5037 (newSize < oldFileSize) ? 1 : 0, 0);
5042 loff_t yaffs_GetFileSize(yaffs_Object *obj)
5044 obj = yaffs_GetEquivalentObject(obj);
5046 switch (obj->variantType) {
5047 case YAFFS_OBJECT_TYPE_FILE:
5048 return obj->variant.fileVariant.fileSize;
5049 case YAFFS_OBJECT_TYPE_SYMLINK:
5050 return yaffs_strlen(obj->variant.symLinkVariant.alias);
5058 int yaffs_FlushFile(yaffs_Object *in, int updateTime)
5062 yaffs_FlushFilesChunkCache(in);
5064 #ifdef CONFIG_YAFFS_WINCE
5065 yfsd_WinFileTimeNow(in->win_mtime);
5068 in->yst_mtime = Y_CURRENT_TIME;
5073 retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5074 0) ? YAFFS_OK : YAFFS_FAIL;
5083 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
5086 /* First off, invalidate the file's data in the cache, without flushing. */
5087 yaffs_InvalidateWholeChunkCache(in);
5089 if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5090 /* Move to the unlinked directory so we have a record that it was deleted. */
5091 yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
5095 yaffs_RemoveObjectFromDirectory(in);
5096 yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
5099 yaffs_FreeObject(in);
5104 /* yaffs_DeleteFile deletes the whole file data
5105 * and the inode associated with the file.
5106 * It does not delete the links associated with the file.
5108 static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
5112 int immediateDeletion = 0;
5116 immediateDeletion = 1;
5119 immediateDeletion = 1;
5122 if (immediateDeletion) {
5124 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5125 _Y("deleted"), 0, 0);
5126 T(YAFFS_TRACE_TRACING,
5127 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5130 in->myDev->nDeletedFiles++;
5131 if (1 || in->myDev->isYaffs2)
5132 yaffs_ResizeFile(in, 0);
5133 yaffs_SoftDeleteFile(in);
5136 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5137 _Y("unlinked"), 0, 0);
5144 int yaffs_DeleteFile(yaffs_Object *in)
5146 int retVal = YAFFS_OK;
5147 int deleted = in->deleted;
5149 yaffs_ResizeFile(in, 0);
5151 if (in->nDataChunks > 0) {
5152 /* Use soft deletion if there is data in the file.
5153 * That won't be the case if it has been resized to zero.
5156 retVal = yaffs_UnlinkFileIfNeeded(in);
5158 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5161 in->myDev->nDeletedFiles++;
5162 yaffs_SoftDeleteFile(in);
5164 return deleted ? YAFFS_OK : YAFFS_FAIL;
5166 /* The file has no data chunks so we toss it immediately */
5167 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5168 in->variant.fileVariant.top = NULL;
5169 yaffs_DoGenericObjectDeletion(in);
5175 static int yaffs_DeleteDirectory(yaffs_Object *in)
5177 /* First check that the directory is empty. */
5178 if (ylist_empty(&in->variant.directoryVariant.children))
5179 return yaffs_DoGenericObjectDeletion(in);
5185 static int yaffs_DeleteSymLink(yaffs_Object *in)
5187 YFREE(in->variant.symLinkVariant.alias);
5189 return yaffs_DoGenericObjectDeletion(in);
5192 static int yaffs_DeleteHardLink(yaffs_Object *in)
5194 /* remove this hardlink from the list assocaited with the equivalent
5197 ylist_del_init(&in->hardLinks);
5198 return yaffs_DoGenericObjectDeletion(in);
5201 int yaffs_DeleteObject(yaffs_Object *obj)
5204 switch (obj->variantType) {
5205 case YAFFS_OBJECT_TYPE_FILE:
5206 retVal = yaffs_DeleteFile(obj);
5208 case YAFFS_OBJECT_TYPE_DIRECTORY:
5209 return yaffs_DeleteDirectory(obj);
5211 case YAFFS_OBJECT_TYPE_SYMLINK:
5212 retVal = yaffs_DeleteSymLink(obj);
5214 case YAFFS_OBJECT_TYPE_HARDLINK:
5215 retVal = yaffs_DeleteHardLink(obj);
5217 case YAFFS_OBJECT_TYPE_SPECIAL:
5218 retVal = yaffs_DoGenericObjectDeletion(obj);
5220 case YAFFS_OBJECT_TYPE_UNKNOWN:
5222 break; /* should not happen. */
5228 static int yaffs_UnlinkWorker(yaffs_Object *obj)
5231 int immediateDeletion = 0;
5235 immediateDeletion = 1;
5237 if (obj->inUse <= 0)
5238 immediateDeletion = 1;
5242 yaffs_UpdateParent(obj->parent);
5244 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5245 return yaffs_DeleteHardLink(obj);
5246 } else if (!ylist_empty(&obj->hardLinks)) {
5247 /* Curve ball: We're unlinking an object that has a hardlink.
5249 * This problem arises because we are not strictly following
5250 * The Linux link/inode model.
5252 * We can't really delete the object.
5253 * Instead, we do the following:
5254 * - Select a hardlink.
5255 * - Unhook it from the hard links
5256 * - Unhook it from its parent directory (so that the rename can work)
5257 * - Rename the object to the hardlink's name.
5258 * - Delete the hardlink
5263 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5265 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5267 ylist_del_init(&hl->hardLinks);
5268 ylist_del_init(&hl->siblings);
5270 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5272 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
5274 if (retVal == YAFFS_OK)
5275 retVal = yaffs_DoGenericObjectDeletion(hl);
5279 } else if (immediateDeletion) {
5280 switch (obj->variantType) {
5281 case YAFFS_OBJECT_TYPE_FILE:
5282 return yaffs_DeleteFile(obj);
5284 case YAFFS_OBJECT_TYPE_DIRECTORY:
5285 return yaffs_DeleteDirectory(obj);
5287 case YAFFS_OBJECT_TYPE_SYMLINK:
5288 return yaffs_DeleteSymLink(obj);
5290 case YAFFS_OBJECT_TYPE_SPECIAL:
5291 return yaffs_DoGenericObjectDeletion(obj);
5293 case YAFFS_OBJECT_TYPE_HARDLINK:
5294 case YAFFS_OBJECT_TYPE_UNKNOWN:
5299 return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
5300 _Y("unlinked"), 0, 0);
5304 static int yaffs_UnlinkObject(yaffs_Object *obj)
5307 if (obj && obj->unlinkAllowed)
5308 return yaffs_UnlinkWorker(obj);
5313 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
5317 obj = yaffs_FindObjectByName(dir, name);
5318 return yaffs_UnlinkObject(obj);
5321 /*----------------------- Initialisation Scanning ---------------------- */
5323 static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
5324 int backwardScanning)
5328 if (!backwardScanning) {
5329 /* Handle YAFFS1 forward scanning case
5330 * For YAFFS1 we always do the deletion
5334 /* Handle YAFFS2 case (backward scanning)
5335 * If the shadowed object exists then ignore.
5337 if (yaffs_FindObjectByNumber(dev, objId))
5341 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5342 * We put it in unlinked dir to be cleaned up after the scanning
5345 yaffs_FindOrCreateObjectByNumber(dev, objId,
5346 YAFFS_OBJECT_TYPE_FILE);
5349 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5350 obj->variant.fileVariant.shrinkSize = 0;
5351 obj->valid = 1; /* So that we don't read any other info for this file */
5361 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5368 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5370 in = yaffs_FindObjectByNumber(dev,
5371 hl->variant.hardLinkVariant.
5372 equivalentObjectId);
5375 /* Add the hardlink pointers */
5376 hl->variant.hardLinkVariant.equivalentObject = in;
5377 ylist_add(&hl->hardLinks, &in->hardLinks);
5379 /* Todo Need to report/handle this better.
5380 * Got a problem... hardlink to a non-existant object
5382 hl->variant.hardLinkVariant.equivalentObject = NULL;
5383 YINIT_LIST_HEAD(&hl->hardLinks);
5393 static int ybicmp(const void *a, const void *b)
5395 register int aseq = ((yaffs_BlockIndex *)a)->seq;
5396 register int bseq = ((yaffs_BlockIndex *)b)->seq;
5397 register int ablock = ((yaffs_BlockIndex *)a)->block;
5398 register int bblock = ((yaffs_BlockIndex *)b)->block;
5400 return ablock - bblock;
5406 struct yaffs_ShadowFixerStruct {
5409 struct yaffs_ShadowFixerStruct *next;
5413 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
5416 * Sort out state of unlinked and deleted objects after scanning.
5418 struct ylist_head *i;
5419 struct ylist_head *n;
5422 /* Soft delete all the unlinked files */
5423 ylist_for_each_safe(i, n,
5424 &dev->unlinkedDir->variant.directoryVariant.children) {
5426 l = ylist_entry(i, yaffs_Object, siblings);
5427 yaffs_DeleteObject(l);
5431 ylist_for_each_safe(i, n,
5432 &dev->deletedDir->variant.directoryVariant.children) {
5434 l = ylist_entry(i, yaffs_Object, siblings);
5435 yaffs_DeleteObject(l);
5441 static int yaffs_Scan(yaffs_Device *dev)
5443 yaffs_ExtendedTags tags;
5453 yaffs_BlockState state;
5454 yaffs_Object *hardList = NULL;
5455 yaffs_BlockInfo *bi;
5456 __u32 sequenceNumber;
5457 yaffs_ObjectHeader *oh;
5459 yaffs_Object *parent;
5461 int alloc_failed = 0;
5463 struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
5471 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
5472 dev->internalStartBlock, dev->internalEndBlock));
5474 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5476 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5478 /* Scan all the blocks to determine their state */
5479 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5480 bi = yaffs_GetBlockInfo(dev, blk);
5481 yaffs_ClearChunkBits(dev, blk);
5483 bi->softDeletions = 0;
5485 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5487 bi->blockState = state;
5488 bi->sequenceNumber = sequenceNumber;
5490 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
5491 bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
5493 T(YAFFS_TRACE_SCAN_DEBUG,
5494 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5495 state, sequenceNumber));
5497 if (state == YAFFS_BLOCK_STATE_DEAD) {
5498 T(YAFFS_TRACE_BAD_BLOCKS,
5499 (TSTR("block %d is bad" TENDSTR), blk));
5500 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5501 T(YAFFS_TRACE_SCAN_DEBUG,
5502 (TSTR("Block empty " TENDSTR)));
5503 dev->nErasedBlocks++;
5504 dev->nFreeChunks += dev->nChunksPerBlock;
5508 startIterator = dev->internalStartBlock;
5509 endIterator = dev->internalEndBlock;
5511 /* For each block.... */
5512 for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5519 blk = blockIterator;
5521 bi = yaffs_GetBlockInfo(dev, blk);
5522 state = bi->blockState;
5526 /* For each chunk in each block that needs scanning....*/
5527 for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
5528 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5529 /* Read the tags and decide what to do */
5530 chunk = blk * dev->nChunksPerBlock + c;
5532 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5535 /* Let's have a good look at this chunk... */
5537 if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
5543 /*T((" %d %d deleted\n",blk,c)); */
5544 } else if (!tags.chunkUsed) {
5545 /* An unassigned chunk in the block
5546 * This means that either the block is empty or
5547 * this is the one being allocated from
5551 /* We're looking at the first chunk in the block so the block is unused */
5552 state = YAFFS_BLOCK_STATE_EMPTY;
5553 dev->nErasedBlocks++;
5555 /* this is the block being allocated from */
5558 (" Allocating from %d %d" TENDSTR),
5560 state = YAFFS_BLOCK_STATE_ALLOCATING;
5561 dev->allocationBlock = blk;
5562 dev->allocationPage = c;
5563 dev->allocationBlockFinder = blk;
5564 /* Set it to here to encourage the allocator to go forth from here. */
5568 dev->nFreeChunks += (dev->nChunksPerBlock - c);
5569 } else if (tags.chunkId > 0) {
5570 /* chunkId > 0 so it is a data chunk... */
5571 unsigned int endpos;
5573 yaffs_SetChunkBit(dev, blk, c);
5576 in = yaffs_FindOrCreateObjectByNumber(dev,
5579 YAFFS_OBJECT_TYPE_FILE);
5580 /* PutChunkIntoFile checks for a clash (two data chunks with
5581 * the same chunkId).
5588 if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
5593 (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5596 in->variantType == YAFFS_OBJECT_TYPE_FILE
5597 && in->variant.fileVariant.scannedFileSize <
5599 in->variant.fileVariant.
5600 scannedFileSize = endpos;
5601 if (!dev->useHeaderFileSize) {
5602 in->variant.fileVariant.
5604 in->variant.fileVariant.
5609 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
5611 /* chunkId == 0, so it is an ObjectHeader.
5612 * Thus, we read in the object header and make the object
5614 yaffs_SetChunkBit(dev, blk, c);
5617 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
5621 oh = (yaffs_ObjectHeader *) chunkData;
5623 in = yaffs_FindObjectByNumber(dev,
5625 if (in && in->variantType != oh->type) {
5626 /* This should not happen, but somehow
5627 * Wev'e ended up with an objectId that has been reused but not yet
5628 * deleted, and worse still it has changed type. Delete the old object.
5631 yaffs_DeleteObject(in);
5636 in = yaffs_FindOrCreateObjectByNumber(dev,
5644 if (in && oh->shadowsObject > 0) {
5646 struct yaffs_ShadowFixerStruct *fixer;
5647 fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
5649 fixer->next = shadowFixerList;
5650 shadowFixerList = fixer;
5651 fixer->objectId = tags.objectId;
5652 fixer->shadowedId = oh->shadowsObject;
5657 if (in && in->valid) {
5658 /* We have already filled this one. We have a duplicate and need to resolve it. */
5660 unsigned existingSerial = in->serial;
5661 unsigned newSerial = tags.serialNumber;
5663 if (((existingSerial + 1) & 3) == newSerial) {
5664 /* Use new one - destroy the exisiting one */
5665 yaffs_DeleteChunk(dev,
5670 /* Use existing - destroy this one. */
5671 yaffs_DeleteChunk(dev, chunk, 1,
5676 if (in && !in->valid &&
5677 (tags.objectId == YAFFS_OBJECTID_ROOT ||
5678 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
5679 /* We only load some info, don't fiddle with directory structure */
5681 in->variantType = oh->type;
5683 in->yst_mode = oh->yst_mode;
5684 #ifdef CONFIG_YAFFS_WINCE
5685 in->win_atime[0] = oh->win_atime[0];
5686 in->win_ctime[0] = oh->win_ctime[0];
5687 in->win_mtime[0] = oh->win_mtime[0];
5688 in->win_atime[1] = oh->win_atime[1];
5689 in->win_ctime[1] = oh->win_ctime[1];
5690 in->win_mtime[1] = oh->win_mtime[1];
5692 in->yst_uid = oh->yst_uid;
5693 in->yst_gid = oh->yst_gid;
5694 in->yst_atime = oh->yst_atime;
5695 in->yst_mtime = oh->yst_mtime;
5696 in->yst_ctime = oh->yst_ctime;
5697 in->yst_rdev = oh->yst_rdev;
5699 in->hdrChunk = chunk;
5700 in->serial = tags.serialNumber;
5702 } else if (in && !in->valid) {
5703 /* we need to load this info */
5706 in->variantType = oh->type;
5708 in->yst_mode = oh->yst_mode;
5709 #ifdef CONFIG_YAFFS_WINCE
5710 in->win_atime[0] = oh->win_atime[0];
5711 in->win_ctime[0] = oh->win_ctime[0];
5712 in->win_mtime[0] = oh->win_mtime[0];
5713 in->win_atime[1] = oh->win_atime[1];
5714 in->win_ctime[1] = oh->win_ctime[1];
5715 in->win_mtime[1] = oh->win_mtime[1];
5717 in->yst_uid = oh->yst_uid;
5718 in->yst_gid = oh->yst_gid;
5719 in->yst_atime = oh->yst_atime;
5720 in->yst_mtime = oh->yst_mtime;
5721 in->yst_ctime = oh->yst_ctime;
5722 in->yst_rdev = oh->yst_rdev;
5724 in->hdrChunk = chunk;
5725 in->serial = tags.serialNumber;
5727 yaffs_SetObjectName(in, oh->name);
5730 /* directory stuff...
5735 yaffs_FindOrCreateObjectByNumber
5736 (dev, oh->parentObjectId,
5737 YAFFS_OBJECT_TYPE_DIRECTORY);
5740 if (parent && parent->variantType ==
5741 YAFFS_OBJECT_TYPE_UNKNOWN) {
5742 /* Set up as a directory */
5743 parent->variantType =
5744 YAFFS_OBJECT_TYPE_DIRECTORY;
5745 YINIT_LIST_HEAD(&parent->variant.
5748 } else if (!parent || parent->variantType !=
5749 YAFFS_OBJECT_TYPE_DIRECTORY) {
5750 /* Hoosterman, another problem....
5751 * We're trying to use a non-directory as a directory
5754 T(YAFFS_TRACE_ERROR,
5756 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
5758 parent = dev->lostNFoundDir;
5761 yaffs_AddObjectToDirectory(parent, in);
5763 if (0 && (parent == dev->deletedDir ||
5764 parent == dev->unlinkedDir)) {
5765 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
5766 dev->nDeletedFiles++;
5768 /* Note re hardlinks.
5769 * Since we might scan a hardlink before its equivalent object is scanned
5770 * we put them all in a list.
5771 * After scanning is complete, we should have all the objects, so we run through this
5772 * list and fix up all the chains.
5775 switch (in->variantType) {
5776 case YAFFS_OBJECT_TYPE_UNKNOWN:
5777 /* Todo got a problem */
5779 case YAFFS_OBJECT_TYPE_FILE:
5780 if (dev->useHeaderFileSize)
5782 in->variant.fileVariant.
5787 case YAFFS_OBJECT_TYPE_HARDLINK:
5788 in->variant.hardLinkVariant.
5789 equivalentObjectId =
5790 oh->equivalentObjectId;
5791 in->hardLinks.next =
5792 (struct ylist_head *)
5796 case YAFFS_OBJECT_TYPE_DIRECTORY:
5799 case YAFFS_OBJECT_TYPE_SPECIAL:
5802 case YAFFS_OBJECT_TYPE_SYMLINK:
5803 in->variant.symLinkVariant.alias =
5804 yaffs_CloneString(oh->alias);
5805 if (!in->variant.symLinkVariant.alias)
5811 if (parent == dev->deletedDir) {
5812 yaffs_DestroyObject(in);
5813 bi->hasShrinkHeader = 1;
5820 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5821 /* If we got this far while scanning, then the block is fully allocated.*/
5822 state = YAFFS_BLOCK_STATE_FULL;
5825 bi->blockState = state;
5827 /* Now let's see if it was dirty */
5828 if (bi->pagesInUse == 0 &&
5829 !bi->hasShrinkHeader &&
5830 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
5831 yaffs_BlockBecameDirty(dev, blk);
5837 /* Ok, we've done all the scanning.
5838 * Fix up the hard link chains.
5839 * We should now have scanned all the objects, now it's time to add these
5843 yaffs_HardlinkFixup(dev, hardList);
5845 /* Fix up any shadowed objects */
5847 struct yaffs_ShadowFixerStruct *fixer;
5850 while (shadowFixerList) {
5851 fixer = shadowFixerList;
5852 shadowFixerList = fixer->next;
5853 /* Complete the rename transaction by deleting the shadowed object
5854 * then setting the object header to unshadowed.
5856 obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
5858 yaffs_DeleteObject(obj);
5860 obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
5863 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
5869 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5874 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
5880 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
5883 yaffs_ObjectHeader *oh;
5885 yaffs_ExtendedTags tags;
5887 int alloc_failed = 0;
5895 T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
5897 in->lazyLoaded ? "not yet" : "already"));
5900 if (in->lazyLoaded && in->hdrChunk > 0) {
5902 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5904 result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
5905 oh = (yaffs_ObjectHeader *) chunkData;
5907 in->yst_mode = oh->yst_mode;
5908 #ifdef CONFIG_YAFFS_WINCE
5909 in->win_atime[0] = oh->win_atime[0];
5910 in->win_ctime[0] = oh->win_ctime[0];
5911 in->win_mtime[0] = oh->win_mtime[0];
5912 in->win_atime[1] = oh->win_atime[1];
5913 in->win_ctime[1] = oh->win_ctime[1];
5914 in->win_mtime[1] = oh->win_mtime[1];
5916 in->yst_uid = oh->yst_uid;
5917 in->yst_gid = oh->yst_gid;
5918 in->yst_atime = oh->yst_atime;
5919 in->yst_mtime = oh->yst_mtime;
5920 in->yst_ctime = oh->yst_ctime;
5921 in->yst_rdev = oh->yst_rdev;
5924 yaffs_SetObjectName(in, oh->name);
5926 if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
5927 in->variant.symLinkVariant.alias =
5928 yaffs_CloneString(oh->alias);
5929 if (!in->variant.symLinkVariant.alias)
5930 alloc_failed = 1; /* Not returned to caller */
5933 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5937 static int yaffs_ScanBackwards(yaffs_Device *dev)
5939 yaffs_ExtendedTags tags;
5944 int nBlocksToScan = 0;
5950 yaffs_BlockState state;
5951 yaffs_Object *hardList = NULL;
5952 yaffs_BlockInfo *bi;
5953 __u32 sequenceNumber;
5954 yaffs_ObjectHeader *oh;
5956 yaffs_Object *parent;
5957 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5963 int foundChunksInBlock;
5964 int equivalentObjectId;
5965 int alloc_failed = 0;
5968 yaffs_BlockIndex *blockIndex = NULL;
5969 int altBlockIndex = 0;
5971 if (!dev->isYaffs2) {
5973 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
5979 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
5980 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
5983 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5985 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
5988 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
5994 (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
5998 dev->blocksInCheckpoint = 0;
6000 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6002 /* Scan all the blocks to determine their state */
6003 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6004 bi = yaffs_GetBlockInfo(dev, blk);
6005 yaffs_ClearChunkBits(dev, blk);
6007 bi->softDeletions = 0;
6009 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6011 bi->blockState = state;
6012 bi->sequenceNumber = sequenceNumber;
6014 if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6015 bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6016 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6017 bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6019 T(YAFFS_TRACE_SCAN_DEBUG,
6020 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6021 state, sequenceNumber));
6024 if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
6025 dev->blocksInCheckpoint++;
6027 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6028 T(YAFFS_TRACE_BAD_BLOCKS,
6029 (TSTR("block %d is bad" TENDSTR), blk));
6030 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6031 T(YAFFS_TRACE_SCAN_DEBUG,
6032 (TSTR("Block empty " TENDSTR)));
6033 dev->nErasedBlocks++;
6034 dev->nFreeChunks += dev->nChunksPerBlock;
6035 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6037 /* Determine the highest sequence number */
6038 if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6039 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6041 blockIndex[nBlocksToScan].seq = sequenceNumber;
6042 blockIndex[nBlocksToScan].block = blk;
6046 if (sequenceNumber >= dev->sequenceNumber)
6047 dev->sequenceNumber = sequenceNumber;
6049 /* TODO: Nasty sequence number! */
6052 ("Block scanning block %d has bad sequence number %d"
6053 TENDSTR), blk, sequenceNumber));
6060 (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6066 /* Sort the blocks */
6067 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6069 /* Use qsort now. */
6070 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6074 /* Dungy old bubble sort... */
6076 yaffs_BlockIndex temp;
6080 for (i = 0; i < nBlocksToScan; i++)
6081 for (j = i + 1; j < nBlocksToScan; j++)
6082 if (blockIndex[i].seq > blockIndex[j].seq) {
6083 temp = blockIndex[j];
6084 blockIndex[j] = blockIndex[i];
6085 blockIndex[i] = temp;
6092 T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6094 /* Now scan the blocks looking at the data. */
6096 endIterator = nBlocksToScan - 1;
6097 T(YAFFS_TRACE_SCAN_DEBUG,
6098 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6100 /* For each block.... backwards */
6101 for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6103 /* Cooperative multitasking! This loop can run for so
6104 long that watchdog timers expire. */
6107 /* get the block to scan in the correct order */
6108 blk = blockIndex[blockIterator].block;
6110 bi = yaffs_GetBlockInfo(dev, blk);
6113 state = bi->blockState;
6117 /* For each chunk in each block that needs scanning.... */
6118 foundChunksInBlock = 0;
6119 for (c = dev->nChunksPerBlock - 1;
6120 !alloc_failed && c >= 0 &&
6121 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6122 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6123 /* Scan backwards...
6124 * Read the tags and decide what to do
6127 chunk = blk * dev->nChunksPerBlock + c;
6129 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6132 /* Let's have a good look at this chunk... */
6134 if (!tags.chunkUsed) {
6135 /* An unassigned chunk in the block.
6136 * If there are used chunks after this one, then
6137 * it is a chunk that was skipped due to failing the erased
6138 * check. Just skip it so that it can be deleted.
6139 * But, more typically, We get here when this is an unallocated
6140 * chunk and his means that either the block is empty or
6141 * this is the one being allocated from
6144 if (foundChunksInBlock) {
6145 /* This is a chunk that was skipped due to failing the erased check */
6146 } else if (c == 0) {
6147 /* We're looking at the first chunk in the block so the block is unused */
6148 state = YAFFS_BLOCK_STATE_EMPTY;
6149 dev->nErasedBlocks++;
6151 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6152 state == YAFFS_BLOCK_STATE_ALLOCATING) {
6153 if (dev->sequenceNumber == bi->sequenceNumber) {
6154 /* this is the block being allocated from */
6158 (" Allocating from %d %d"
6161 state = YAFFS_BLOCK_STATE_ALLOCATING;
6162 dev->allocationBlock = blk;
6163 dev->allocationPage = c;
6164 dev->allocationBlockFinder = blk;
6166 /* This is a partially written block that is not
6167 * the current allocation block. This block must have
6168 * had a write failure, so set up for retirement.
6171 /* bi->needsRetiring = 1; ??? TODO */
6172 bi->gcPrioritise = 1;
6174 T(YAFFS_TRACE_ALWAYS,
6175 (TSTR("Partially written block %d detected" TENDSTR),
6183 } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
6185 (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
6190 } else if (tags.chunkId > 0) {
6191 /* chunkId > 0 so it is a data chunk... */
6192 unsigned int endpos;
6194 (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6196 foundChunksInBlock = 1;
6199 yaffs_SetChunkBit(dev, blk, c);
6202 in = yaffs_FindOrCreateObjectByNumber(dev,
6205 YAFFS_OBJECT_TYPE_FILE);
6212 in->variantType == YAFFS_OBJECT_TYPE_FILE
6214 in->variant.fileVariant.shrinkSize) {
6215 /* This has not been invalidated by a resize */
6216 if (!yaffs_PutChunkIntoFile(in, tags.chunkId,
6221 /* File size is calculated by looking at the data chunks if we have not
6222 * seen an object header yet. Stop this practice once we find an object header.
6226 1) * dev->nDataBytesPerChunk +
6229 if (!in->valid && /* have not got an object header yet */
6230 in->variant.fileVariant.
6231 scannedFileSize < endpos) {
6232 in->variant.fileVariant.
6233 scannedFileSize = endpos;
6234 in->variant.fileVariant.
6236 in->variant.fileVariant.
6241 /* This chunk has been invalidated by a resize, so delete */
6242 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6246 /* chunkId == 0, so it is an ObjectHeader.
6247 * Thus, we read in the object header and make the object
6249 foundChunksInBlock = 1;
6251 yaffs_SetChunkBit(dev, blk, c);
6257 if (tags.extraHeaderInfoAvailable) {
6258 in = yaffs_FindOrCreateObjectByNumber
6259 (dev, tags.objectId,
6260 tags.extraObjectType);
6266 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
6269 tags.extraShadows ||
6271 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6272 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
6274 /* If we don't have valid info then we need to read the chunk
6275 * TODO In future we can probably defer reading the chunk and
6276 * living with invalid data until needed.
6279 result = yaffs_ReadChunkWithTagsFromNAND(dev,
6284 oh = (yaffs_ObjectHeader *) chunkData;
6286 if (dev->inbandTags) {
6287 /* Fix up the header if they got corrupted by inband tags */
6288 oh->shadowsObject = oh->inbandShadowsObject;
6289 oh->isShrink = oh->inbandIsShrink;
6293 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6301 /* TODO Hoosterman we have a problem! */
6302 T(YAFFS_TRACE_ERROR,
6304 ("yaffs tragedy: Could not make object for object %d at chunk %d during scan"
6305 TENDSTR), tags.objectId, chunk));
6310 /* We have already filled this one.
6311 * We have a duplicate that will be discarded, but
6312 * we first have to suck out resize info if it is a file.
6315 if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6317 oh->type == YAFFS_OBJECT_TYPE_FILE) ||
6318 (tags.extraHeaderInfoAvailable &&
6319 tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
6321 (oh) ? oh->fileSize : tags.
6323 __u32 parentObjectId =
6325 parentObjectId : tags.
6326 extraParentObjectId;
6330 (oh) ? oh->isShrink : tags.
6331 extraIsShrinkHeader;
6333 /* If it is deleted (unlinked at start also means deleted)
6334 * we treat the file size as being zeroed at this point.
6336 if (parentObjectId ==
6337 YAFFS_OBJECTID_DELETED
6338 || parentObjectId ==
6339 YAFFS_OBJECTID_UNLINKED) {
6345 in->variant.fileVariant.
6346 shrinkSize > thisSize) {
6347 in->variant.fileVariant.
6353 bi->hasShrinkHeader = 1;
6356 /* Use existing - destroy this one. */
6357 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6361 if (!in->valid && in->variantType !=
6362 (oh ? oh->type : tags.extraObjectType))
6363 T(YAFFS_TRACE_ERROR, (
6364 TSTR("yaffs tragedy: Bad object type, "
6365 TCONT("%d != %d, for object %d at chunk ")
6366 TCONT("%d during scan")
6368 oh->type : tags.extraObjectType,
6369 in->variantType, tags.objectId,
6373 (tags.objectId == YAFFS_OBJECTID_ROOT ||
6375 YAFFS_OBJECTID_LOSTNFOUND)) {
6376 /* We only load some info, don't fiddle with directory structure */
6380 in->variantType = oh->type;
6382 in->yst_mode = oh->yst_mode;
6383 #ifdef CONFIG_YAFFS_WINCE
6384 in->win_atime[0] = oh->win_atime[0];
6385 in->win_ctime[0] = oh->win_ctime[0];
6386 in->win_mtime[0] = oh->win_mtime[0];
6387 in->win_atime[1] = oh->win_atime[1];
6388 in->win_ctime[1] = oh->win_ctime[1];
6389 in->win_mtime[1] = oh->win_mtime[1];
6391 in->yst_uid = oh->yst_uid;
6392 in->yst_gid = oh->yst_gid;
6393 in->yst_atime = oh->yst_atime;
6394 in->yst_mtime = oh->yst_mtime;
6395 in->yst_ctime = oh->yst_ctime;
6396 in->yst_rdev = oh->yst_rdev;
6400 in->variantType = tags.extraObjectType;
6404 in->hdrChunk = chunk;
6406 } else if (!in->valid) {
6407 /* we need to load this info */
6410 in->hdrChunk = chunk;
6413 in->variantType = oh->type;
6415 in->yst_mode = oh->yst_mode;
6416 #ifdef CONFIG_YAFFS_WINCE
6417 in->win_atime[0] = oh->win_atime[0];
6418 in->win_ctime[0] = oh->win_ctime[0];
6419 in->win_mtime[0] = oh->win_mtime[0];
6420 in->win_atime[1] = oh->win_atime[1];
6421 in->win_ctime[1] = oh->win_ctime[1];
6422 in->win_mtime[1] = oh->win_mtime[1];
6424 in->yst_uid = oh->yst_uid;
6425 in->yst_gid = oh->yst_gid;
6426 in->yst_atime = oh->yst_atime;
6427 in->yst_mtime = oh->yst_mtime;
6428 in->yst_ctime = oh->yst_ctime;
6429 in->yst_rdev = oh->yst_rdev;
6432 if (oh->shadowsObject > 0)
6433 yaffs_HandleShadowedObject(dev,
6439 yaffs_SetObjectName(in, oh->name);
6441 yaffs_FindOrCreateObjectByNumber
6442 (dev, oh->parentObjectId,
6443 YAFFS_OBJECT_TYPE_DIRECTORY);
6445 fileSize = oh->fileSize;
6446 isShrink = oh->isShrink;
6447 equivalentObjectId = oh->equivalentObjectId;
6450 in->variantType = tags.extraObjectType;
6452 yaffs_FindOrCreateObjectByNumber
6453 (dev, tags.extraParentObjectId,
6454 YAFFS_OBJECT_TYPE_DIRECTORY);
6455 fileSize = tags.extraFileLength;
6456 isShrink = tags.extraIsShrinkHeader;
6457 equivalentObjectId = tags.extraEquivalentObjectId;
6466 /* directory stuff...
6470 if (parent && parent->variantType ==
6471 YAFFS_OBJECT_TYPE_UNKNOWN) {
6472 /* Set up as a directory */
6473 parent->variantType =
6474 YAFFS_OBJECT_TYPE_DIRECTORY;
6475 YINIT_LIST_HEAD(&parent->variant.
6478 } else if (!parent || parent->variantType !=
6479 YAFFS_OBJECT_TYPE_DIRECTORY) {
6480 /* Hoosterman, another problem....
6481 * We're trying to use a non-directory as a directory
6484 T(YAFFS_TRACE_ERROR,
6486 ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6488 parent = dev->lostNFoundDir;
6491 yaffs_AddObjectToDirectory(parent, in);
6493 itsUnlinked = (parent == dev->deletedDir) ||
6494 (parent == dev->unlinkedDir);
6497 /* Mark the block as having a shrinkHeader */
6498 bi->hasShrinkHeader = 1;
6501 /* Note re hardlinks.
6502 * Since we might scan a hardlink before its equivalent object is scanned
6503 * we put them all in a list.
6504 * After scanning is complete, we should have all the objects, so we run
6505 * through this list and fix up all the chains.
6508 switch (in->variantType) {
6509 case YAFFS_OBJECT_TYPE_UNKNOWN:
6510 /* Todo got a problem */
6512 case YAFFS_OBJECT_TYPE_FILE:
6514 if (in->variant.fileVariant.
6515 scannedFileSize < fileSize) {
6516 /* This covers the case where the file size is greater
6517 * than where the data is
6518 * This will happen if the file is resized to be larger
6519 * than its current data extents.
6521 in->variant.fileVariant.fileSize = fileSize;
6522 in->variant.fileVariant.scannedFileSize =
6523 in->variant.fileVariant.fileSize;
6527 in->variant.fileVariant.shrinkSize > fileSize) {
6528 in->variant.fileVariant.shrinkSize = fileSize;
6532 case YAFFS_OBJECT_TYPE_HARDLINK:
6534 in->variant.hardLinkVariant.equivalentObjectId =
6536 in->hardLinks.next =
6537 (struct ylist_head *) hardList;
6541 case YAFFS_OBJECT_TYPE_DIRECTORY:
6544 case YAFFS_OBJECT_TYPE_SPECIAL:
6547 case YAFFS_OBJECT_TYPE_SYMLINK:
6549 in->variant.symLinkVariant.alias =
6550 yaffs_CloneString(oh->alias);
6551 if (!in->variant.symLinkVariant.alias)
6561 } /* End of scanning for each chunk */
6563 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6564 /* If we got this far while scanning, then the block is fully allocated. */
6565 state = YAFFS_BLOCK_STATE_FULL;
6568 bi->blockState = state;
6570 /* Now let's see if it was dirty */
6571 if (bi->pagesInUse == 0 &&
6572 !bi->hasShrinkHeader &&
6573 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6574 yaffs_BlockBecameDirty(dev, blk);
6580 YFREE_ALT(blockIndex);
6584 /* Ok, we've done all the scanning.
6585 * Fix up the hard link chains.
6586 * We should now have scanned all the objects, now it's time to add these
6589 yaffs_HardlinkFixup(dev, hardList);
6592 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6597 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6602 /*------------------------------ Directory Functions ----------------------------- */
6604 static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
6606 struct ylist_head *lh;
6607 yaffs_Object *listObj;
6612 T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
6617 if (yaffs_SkipVerification(obj->myDev))
6621 T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
6626 if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6627 T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
6631 /* Iterate through the objects in each hash entry */
6633 ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
6635 listObj = ylist_entry(lh, yaffs_Object, siblings);
6636 yaffs_VerifyObject(listObj);
6643 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
6648 static void yaffs_VerifyDirectory(yaffs_Object *directory)
6650 struct ylist_head *lh;
6651 yaffs_Object *listObj;
6658 if (yaffs_SkipFullVerification(directory->myDev))
6661 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6662 T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
6666 /* Iterate through the objects in each hash entry */
6668 ylist_for_each(lh, &directory->variant.directoryVariant.children) {
6670 listObj = ylist_entry(lh, yaffs_Object, siblings);
6671 if (listObj->parent != directory) {
6672 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
6675 yaffs_VerifyObjectInDirectory(listObj);
6681 *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
6682 * link (ie. name) is created or deleted in the directory.
6685 * create dir/a : update dir's mtime/ctime
6686 * rm dir/a: update dir's mtime/ctime
6687 * modify dir/a: don't update dir's mtimme/ctime
6690 static void yaffs_UpdateParent(yaffs_Object *obj)
6696 obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
6698 yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
6701 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
6703 yaffs_Device *dev = obj->myDev;
6704 yaffs_Object *parent;
6706 yaffs_VerifyObjectInDirectory(obj);
6707 parent = obj->parent;
6709 yaffs_VerifyDirectory(parent);
6711 if (dev && dev->removeObjectCallback)
6712 dev->removeObjectCallback(obj);
6715 ylist_del_init(&obj->siblings);
6718 yaffs_VerifyDirectory(parent);
6721 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
6725 T(YAFFS_TRACE_ALWAYS,
6727 ("tragedy: Trying to add an object to a null pointer directory"
6732 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6733 T(YAFFS_TRACE_ALWAYS,
6735 ("tragedy: Trying to add an object to a non-directory"
6740 if (obj->siblings.prev == NULL) {
6741 /* Not initialised */
6746 yaffs_VerifyDirectory(directory);
6748 yaffs_RemoveObjectFromDirectory(obj);
6752 ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
6753 obj->parent = directory;
6755 if (directory == obj->myDev->unlinkedDir
6756 || directory == obj->myDev->deletedDir) {
6758 obj->myDev->nUnlinkedFiles++;
6759 obj->renameAllowed = 0;
6762 yaffs_VerifyDirectory(directory);
6763 yaffs_VerifyObjectInDirectory(obj);
6766 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
6771 struct ylist_head *i;
6772 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
6780 T(YAFFS_TRACE_ALWAYS,
6782 ("tragedy: yaffs_FindObjectByName: null pointer directory"
6787 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6788 T(YAFFS_TRACE_ALWAYS,
6790 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6794 sum = yaffs_CalcNameSum(name);
6796 ylist_for_each(i, &directory->variant.directoryVariant.children) {
6798 l = ylist_entry(i, yaffs_Object, siblings);
6800 if (l->parent != directory)
6803 yaffs_CheckObjectDetailsLoaded(l);
6805 /* Special case for lost-n-found */
6806 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6807 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
6809 } else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
6810 /* LostnFound chunk called Objxxx
6813 yaffs_GetObjectName(l, buffer,
6814 YAFFS_MAX_NAME_LENGTH);
6815 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
6826 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
6827 int (*fn) (yaffs_Object *))
6829 struct ylist_head *i;
6833 T(YAFFS_TRACE_ALWAYS,
6835 ("tragedy: yaffs_FindObjectByName: null pointer directory"
6840 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6841 T(YAFFS_TRACE_ALWAYS,
6843 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6848 ylist_for_each(i, &theDir->variant.directoryVariant.children) {
6850 l = ylist_entry(i, yaffs_Object, siblings);
6861 /* GetEquivalentObject dereferences any hard links to get to the
6865 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
6867 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
6868 /* We want the object id of the equivalent object, not this one */
6869 obj = obj->variant.hardLinkVariant.equivalentObject;
6870 yaffs_CheckObjectDetailsLoaded(obj);
6875 int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
6877 memset(name, 0, buffSize * sizeof(YCHAR));
6879 yaffs_CheckObjectDetailsLoaded(obj);
6881 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6882 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
6883 } else if (obj->hdrChunk <= 0) {
6885 YCHAR numString[20];
6886 YCHAR *x = &numString[19];
6887 unsigned v = obj->objectId;
6891 *x = '0' + (v % 10);
6894 /* make up a name */
6895 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
6896 yaffs_strcat(locName, x);
6897 yaffs_strncpy(name, locName, buffSize - 1);
6900 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
6901 else if (obj->shortName[0])
6902 yaffs_strcpy(name, obj->shortName);
6906 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
6908 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
6910 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
6912 if (obj->hdrChunk > 0) {
6913 result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
6914 obj->hdrChunk, buffer,
6917 yaffs_strncpy(name, oh->name, buffSize - 1);
6919 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
6922 return yaffs_strlen(name);
6925 int yaffs_GetObjectFileLength(yaffs_Object *obj)
6927 /* Dereference any hard linking */
6928 obj = yaffs_GetEquivalentObject(obj);
6930 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
6931 return obj->variant.fileVariant.fileSize;
6932 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
6933 return yaffs_strlen(obj->variant.symLinkVariant.alias);
6935 /* Only a directory should drop through to here */
6936 return obj->myDev->nDataBytesPerChunk;
6940 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
6943 struct ylist_head *i;
6946 count++; /* the object itself */
6948 ylist_for_each(i, &obj->hardLinks)
6949 count++; /* add the hard links; */
6954 int yaffs_GetObjectInode(yaffs_Object *obj)
6956 obj = yaffs_GetEquivalentObject(obj);
6958 return obj->objectId;
6961 unsigned yaffs_GetObjectType(yaffs_Object *obj)
6963 obj = yaffs_GetEquivalentObject(obj);
6965 switch (obj->variantType) {
6966 case YAFFS_OBJECT_TYPE_FILE:
6969 case YAFFS_OBJECT_TYPE_DIRECTORY:
6972 case YAFFS_OBJECT_TYPE_SYMLINK:
6975 case YAFFS_OBJECT_TYPE_HARDLINK:
6978 case YAFFS_OBJECT_TYPE_SPECIAL:
6979 if (S_ISFIFO(obj->yst_mode))
6981 if (S_ISCHR(obj->yst_mode))
6983 if (S_ISBLK(obj->yst_mode))
6985 if (S_ISSOCK(obj->yst_mode))
6993 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
6995 obj = yaffs_GetEquivalentObject(obj);
6996 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
6997 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
6999 return yaffs_CloneString(_Y(""));
7002 #ifndef CONFIG_YAFFS_WINCE
7004 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
7006 unsigned int valid = attr->ia_valid;
7008 if (valid & ATTR_MODE)
7009 obj->yst_mode = attr->ia_mode;
7010 if (valid & ATTR_UID)
7011 obj->yst_uid = attr->ia_uid;
7012 if (valid & ATTR_GID)
7013 obj->yst_gid = attr->ia_gid;
7015 if (valid & ATTR_ATIME)
7016 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
7017 if (valid & ATTR_CTIME)
7018 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
7019 if (valid & ATTR_MTIME)
7020 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
7022 if (valid & ATTR_SIZE)
7023 yaffs_ResizeFile(obj, attr->ia_size);
7025 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
7030 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
7032 unsigned int valid = 0;
7034 attr->ia_mode = obj->yst_mode;
7036 attr->ia_uid = obj->yst_uid;
7038 attr->ia_gid = obj->yst_gid;
7041 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
7042 valid |= ATTR_ATIME;
7043 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
7044 valid |= ATTR_CTIME;
7045 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
7046 valid |= ATTR_MTIME;
7048 attr->ia_size = yaffs_GetFileSize(obj);
7051 attr->ia_valid = valid;
7059 int yaffs_DumpObject(yaffs_Object *obj)
7063 yaffs_GetObjectName(obj, name, 256);
7065 T(YAFFS_TRACE_ALWAYS,
7067 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
7068 " chunk %d type %d size %d\n"
7069 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
7070 obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
7071 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
7077 /*---------------------------- Initialisation code -------------------------------------- */
7079 static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
7082 /* Common functions, gotta have */
7083 if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
7086 #ifdef CONFIG_YAFFS_YAFFS2
7088 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
7089 if (dev->writeChunkWithTagsToNAND &&
7090 dev->readChunkWithTagsFromNAND &&
7091 !dev->writeChunkToNAND &&
7092 !dev->readChunkFromNAND &&
7093 dev->markNANDBlockBad && dev->queryNANDBlock)
7097 /* Can use the "spare" style interface for yaffs1 */
7098 if (!dev->isYaffs2 &&
7099 !dev->writeChunkWithTagsToNAND &&
7100 !dev->readChunkWithTagsFromNAND &&
7101 dev->writeChunkToNAND &&
7102 dev->readChunkFromNAND &&
7103 !dev->markNANDBlockBad && !dev->queryNANDBlock)
7110 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7112 /* Initialise the unlinked, deleted, root and lost and found directories */
7114 dev->lostNFoundDir = dev->rootDir = NULL;
7115 dev->unlinkedDir = dev->deletedDir = NULL;
7118 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7121 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7124 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7125 YAFFS_ROOT_MODE | S_IFDIR);
7126 dev->lostNFoundDir =
7127 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7128 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7130 if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
7131 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7138 int yaffs_GutsInitialise(yaffs_Device *dev)
7140 int init_failed = 0;
7144 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7146 /* Check stuff that must be set */
7149 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7153 dev->internalStartBlock = dev->startBlock;
7154 dev->internalEndBlock = dev->endBlock;
7155 dev->blockOffset = 0;
7156 dev->chunkOffset = 0;
7157 dev->nFreeChunks = 0;
7161 if (dev->startBlock == 0) {
7162 dev->internalStartBlock = dev->startBlock + 1;
7163 dev->internalEndBlock = dev->endBlock + 1;
7164 dev->blockOffset = 1;
7165 dev->chunkOffset = dev->nChunksPerBlock;
7168 /* Check geometry parameters. */
7170 if ((!dev->inbandTags && dev->isYaffs2 && dev->totalBytesPerChunk < 1024) ||
7171 (!dev->isYaffs2 && dev->totalBytesPerChunk < 512) ||
7172 (dev->inbandTags && !dev->isYaffs2) ||
7173 dev->nChunksPerBlock < 2 ||
7174 dev->nReservedBlocks < 2 ||
7175 dev->internalStartBlock <= 0 ||
7176 dev->internalEndBlock <= 0 ||
7177 dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2)) { /* otherwise it is too small */
7178 T(YAFFS_TRACE_ALWAYS,
7180 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
7181 TENDSTR), dev->totalBytesPerChunk, dev->isYaffs2 ? "2" : "", dev->inbandTags));
7185 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7186 T(YAFFS_TRACE_ALWAYS,
7187 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7191 /* Sort out space for inband tags, if required */
7192 if (dev->inbandTags)
7193 dev->nDataBytesPerChunk = dev->totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
7195 dev->nDataBytesPerChunk = dev->totalBytesPerChunk;
7197 /* Got the right mix of functions? */
7198 if (!yaffs_CheckDevFunctions(dev)) {
7199 /* Function missing */
7200 T(YAFFS_TRACE_ALWAYS,
7202 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7207 /* This is really a compilation check. */
7208 if (!yaffs_CheckStructures()) {
7209 T(YAFFS_TRACE_ALWAYS,
7210 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7214 if (dev->isMounted) {
7215 T(YAFFS_TRACE_ALWAYS,
7216 (TSTR("yaffs: device already mounted\n" TENDSTR)));
7220 /* Finished with most checks. One or two more checks happen later on too. */
7224 /* OK now calculate a few things for the device */
7227 * Calculate all the chunk size manipulation numbers:
7229 x = dev->nDataBytesPerChunk;
7230 /* We always use dev->chunkShift and dev->chunkDiv */
7231 dev->chunkShift = Shifts(x);
7232 x >>= dev->chunkShift;
7234 /* We only use chunk mask if chunkDiv is 1 */
7235 dev->chunkMask = (1<<dev->chunkShift) - 1;
7238 * Calculate chunkGroupBits.
7239 * We need to find the next power of 2 > than internalEndBlock
7242 x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
7246 /* Set up tnode width if wide tnodes are enabled. */
7247 if (!dev->wideTnodesDisabled) {
7248 /* bits must be even so that we end up with 32-bit words */
7252 dev->tnodeWidth = 16;
7254 dev->tnodeWidth = bits;
7256 dev->tnodeWidth = 16;
7258 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7260 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7261 * so if the bitwidth of the
7262 * chunk range we're using is greater than 16 we need
7263 * to figure out chunk shift and chunkGroupSize
7266 if (bits <= dev->tnodeWidth)
7267 dev->chunkGroupBits = 0;
7269 dev->chunkGroupBits = bits - dev->tnodeWidth;
7272 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7274 if (dev->nChunksPerBlock < dev->chunkGroupSize) {
7275 /* We have a problem because the soft delete won't work if
7276 * the chunk group size > chunks per block.
7277 * This can be remedied by using larger "virtual blocks".
7279 T(YAFFS_TRACE_ALWAYS,
7280 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7285 /* OK, we've finished verifying the device, lets continue with initialisation */
7287 /* More device initialisation */
7288 dev->garbageCollections = 0;
7289 dev->passiveGarbageCollections = 0;
7290 dev->currentDirtyChecker = 0;
7291 dev->bufferedBlock = -1;
7292 dev->doingBufferedBlockRewrite = 0;
7293 dev->nDeletedFiles = 0;
7294 dev->nBackgroundDeletions = 0;
7295 dev->nUnlinkedFiles = 0;
7297 dev->eccUnfixed = 0;
7298 dev->tagsEccFixed = 0;
7299 dev->tagsEccUnfixed = 0;
7300 dev->nErasureFailures = 0;
7301 dev->nErasedBlocks = 0;
7303 dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7305 /* Initialise temporary buffers and caches. */
7306 if (!yaffs_InitialiseTempBuffers(dev))
7309 dev->srCache = NULL;
7310 dev->gcCleanupList = NULL;
7314 dev->nShortOpCaches > 0) {
7317 int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
7319 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
7320 dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7322 dev->srCache = YMALLOC(srCacheBytes);
7324 buf = (__u8 *) dev->srCache;
7327 memset(dev->srCache, 0, srCacheBytes);
7329 for (i = 0; i < dev->nShortOpCaches && buf; i++) {
7330 dev->srCache[i].object = NULL;
7331 dev->srCache[i].lastUse = 0;
7332 dev->srCache[i].dirty = 0;
7333 dev->srCache[i].data = buf = YMALLOC_DMA(dev->totalBytesPerChunk);
7344 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
7345 if (!dev->gcCleanupList)
7350 dev->useHeaderFileSize = 1;
7352 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7355 yaffs_InitialiseTnodes(dev);
7356 yaffs_InitialiseObjects(dev);
7358 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7363 /* Now scan the flash. */
7364 if (dev->isYaffs2) {
7365 if (yaffs_CheckpointRestore(dev)) {
7366 yaffs_CheckObjectDetailsLoaded(dev->rootDir);
7367 T(YAFFS_TRACE_ALWAYS,
7368 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7371 /* Clean up the mess caused by an aborted checkpoint load
7372 * and scan backwards.
7374 yaffs_DeinitialiseBlocks(dev);
7375 yaffs_DeinitialiseTnodes(dev);
7376 yaffs_DeinitialiseObjects(dev);
7379 dev->nErasedBlocks = 0;
7380 dev->nFreeChunks = 0;
7381 dev->allocationBlock = -1;
7382 dev->allocationPage = -1;
7383 dev->nDeletedFiles = 0;
7384 dev->nUnlinkedFiles = 0;
7385 dev->nBackgroundDeletions = 0;
7386 dev->oldestDirtySequence = 0;
7388 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7391 yaffs_InitialiseTnodes(dev);
7392 yaffs_InitialiseObjects(dev);
7394 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7397 if (!init_failed && !yaffs_ScanBackwards(dev))
7400 } else if (!yaffs_Scan(dev))
7403 yaffs_StripDeletedObjects(dev);
7407 /* Clean up the mess */
7408 T(YAFFS_TRACE_TRACING,
7409 (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7411 yaffs_Deinitialise(dev);
7415 /* Zero out stats */
7416 dev->nPageReads = 0;
7417 dev->nPageWrites = 0;
7418 dev->nBlockErasures = 0;
7420 dev->nRetriedWrites = 0;
7422 dev->nRetiredBlocks = 0;
7424 yaffs_VerifyFreeChunks(dev);
7425 yaffs_VerifyBlocks(dev);
7428 T(YAFFS_TRACE_TRACING,
7429 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7434 void yaffs_Deinitialise(yaffs_Device *dev)
7436 if (dev->isMounted) {
7439 yaffs_DeinitialiseBlocks(dev);
7440 yaffs_DeinitialiseTnodes(dev);
7441 yaffs_DeinitialiseObjects(dev);
7442 if (dev->nShortOpCaches > 0 &&
7445 for (i = 0; i < dev->nShortOpCaches; i++) {
7446 if (dev->srCache[i].data)
7447 YFREE(dev->srCache[i].data);
7448 dev->srCache[i].data = NULL;
7451 YFREE(dev->srCache);
7452 dev->srCache = NULL;
7455 YFREE(dev->gcCleanupList);
7457 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
7458 YFREE(dev->tempBuffer[i].buffer);
7462 if (dev->deinitialiseNAND)
7463 dev->deinitialiseNAND(dev);
7467 static int yaffs_CountFreeChunks(yaffs_Device *dev)
7472 yaffs_BlockInfo *blk;
7474 for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7476 blk = yaffs_GetBlockInfo(dev, b);
7478 switch (blk->blockState) {
7479 case YAFFS_BLOCK_STATE_EMPTY:
7480 case YAFFS_BLOCK_STATE_ALLOCATING:
7481 case YAFFS_BLOCK_STATE_COLLECTING:
7482 case YAFFS_BLOCK_STATE_FULL:
7484 (dev->nChunksPerBlock - blk->pagesInUse +
7485 blk->softDeletions);
7495 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
7497 /* This is what we report to the outside world */
7500 int nDirtyCacheChunks;
7501 int blocksForCheckpoint;
7505 nFree = dev->nFreeChunks;
7507 nFree = yaffs_CountFreeChunks(dev);
7510 nFree += dev->nDeletedFiles;
7512 /* Now count the number of dirty chunks in the cache and subtract those */
7514 for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
7515 if (dev->srCache[i].dirty)
7516 nDirtyCacheChunks++;
7519 nFree -= nDirtyCacheChunks;
7521 nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
7523 /* Now we figure out how much to reserve for the checkpoint and report that... */
7524 blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
7525 if (blocksForCheckpoint < 0)
7526 blocksForCheckpoint = 0;
7528 nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
7537 static int yaffs_freeVerificationFailures;
7539 static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
7544 if (yaffs_SkipVerification(dev))
7547 counted = yaffs_CountFreeChunks(dev);
7549 difference = dev->nFreeChunks - counted;
7552 T(YAFFS_TRACE_ALWAYS,
7553 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7554 dev->nFreeChunks, counted, difference));
7555 yaffs_freeVerificationFailures++;
7559 /*---------------------------------------- YAFFS test code ----------------------*/
7561 #define yaffs_CheckStruct(structure, syze, name) \
7563 if (sizeof(structure) != syze) { \
7564 T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
7565 name, syze, sizeof(structure))); \
7566 return YAFFS_FAIL; \
7570 static int yaffs_CheckStructures(void)
7572 /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
7573 /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
7574 /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
7575 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7576 yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode");
7578 #ifndef CONFIG_YAFFS_WINCE
7579 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");