2 * YAFFS: Yet another FFS. A NAND-flash specific file system.
4 * Copyright (C) 2002 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
15 const char *yaffs_guts_c_version =
16 "$Id: yaffs_guts.c,v 1.32 2006-05-08 10:13:34 charles Exp $";
20 #include "yaffsinterface.h"
21 #include "yaffs_guts.h"
22 #include "yaffs_tagsvalidity.h"
24 #include "yaffs_tagscompat.h"
25 #include "yaffs_nand.h"
27 #include "yaffs_checkptrw.h"
29 #include "yaffs_nand.h"
32 #ifdef CONFIG_YAFFS_WINCE
33 void yfsd_LockYAFFS(BOOL fsLockOnly);
34 void yfsd_UnlockYAFFS(BOOL fsLockOnly);
37 #define YAFFS_PASSIVE_GC_CHUNKS 2
39 #include "yaffs_ecc.h"
42 /* Robustification (if it ever comes about...) */
43 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND);
44 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 int yaffs_UnlinkObject( yaffs_Object *obj);
54 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
56 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device * dev,
58 yaffs_ExtendedTags * tags,
60 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
61 int chunkInNAND, int inScan);
63 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
64 yaffs_ObjectType type);
65 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
67 static int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name,
68 int force, int isShrink, int shadows);
69 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj);
70 static int yaffs_CheckStructures(void);
71 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
72 int chunkOffset, int *limit);
73 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in);
75 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blockNo);
77 static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo);
78 static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
81 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
84 static int yaffs_UnlinkWorker(yaffs_Object * obj);
85 static void yaffs_DestroyObject(yaffs_Object * obj);
87 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
90 loff_t yaffs_GetFileSize(yaffs_Object * obj);
92 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve);
94 static void yaffs_VerifyFreeChunks(yaffs_Device * dev);
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);
108 * Temporary buffer manipulations.
111 static __u8 *yaffs_GetTempBuffer(yaffs_Device * dev, int lineNo)
114 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
115 if (dev->tempBuffer[i].line == 0) {
116 dev->tempBuffer[i].line = lineNo;
117 if ((i + 1) > dev->maxTemp) {
118 dev->maxTemp = i + 1;
119 for (j = 0; j <= i; j++)
120 dev->tempBuffer[j].maxLine =
121 dev->tempBuffer[j].line;
124 return dev->tempBuffer[i].buffer;
128 T(YAFFS_TRACE_BUFFERS,
129 (TSTR("Out of temp buffers at line %d, other held by lines:"),
131 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
132 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
134 T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
137 * If we got here then we have to allocate an unmanaged one
141 dev->unmanagedTempAllocations++;
142 return YMALLOC(dev->nBytesPerChunk);
146 static void yaffs_ReleaseTempBuffer(yaffs_Device * dev, __u8 * buffer,
150 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
151 if (dev->tempBuffer[i].buffer == buffer) {
152 dev->tempBuffer[i].line = 0;
158 /* assume it is an unmanaged one. */
159 T(YAFFS_TRACE_BUFFERS,
160 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
163 dev->unmanagedTempDeallocations++;
169 * Chunk bitmap manipulations
172 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device * dev, int blk)
174 if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
176 (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
180 return dev->chunkBits +
181 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
184 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device * dev, int blk)
186 __u8 *blkBits = yaffs_BlockBits(dev, blk);
188 memset(blkBits, 0, dev->chunkBitmapStride);
191 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device * dev, int blk, int chunk)
193 __u8 *blkBits = yaffs_BlockBits(dev, blk);
195 blkBits[chunk / 8] &= ~(1 << (chunk & 7));
198 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device * dev, int blk, int chunk)
200 __u8 *blkBits = yaffs_BlockBits(dev, blk);
202 blkBits[chunk / 8] |= (1 << (chunk & 7));
205 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device * dev, int blk, int chunk)
207 __u8 *blkBits = yaffs_BlockBits(dev, blk);
208 return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
211 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device * dev, int blk)
213 __u8 *blkBits = yaffs_BlockBits(dev, blk);
215 for (i = 0; i < dev->chunkBitmapStride; i++) {
224 * Simple hash function. Needs to have a reasonable spread
227 static Y_INLINE int yaffs_HashFunction(int n)
230 return (n % YAFFS_NOBJECT_BUCKETS);
234 * Access functions to useful fake objects
237 yaffs_Object *yaffs_Root(yaffs_Device * dev)
242 yaffs_Object *yaffs_LostNFound(yaffs_Device * dev)
244 return dev->lostNFoundDir;
249 * Erased NAND checking functions
252 int yaffs_CheckFF(__u8 * buffer, int nBytes)
254 /* Horrible, slow implementation */
263 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
267 int retval = YAFFS_OK;
268 __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
269 yaffs_ExtendedTags tags;
271 yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
273 if (!yaffs_CheckFF(data, dev->nBytesPerChunk) || tags.chunkUsed) {
274 T(YAFFS_TRACE_NANDACCESS,
275 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
279 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
285 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
287 yaffs_ExtendedTags * tags,
295 yaffs_InvalidateCheckpoint(dev);
298 chunk = yaffs_AllocateChunk(dev, useReserve);
302 /* First check this chunk is erased... */
303 #ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
304 writeOk = yaffs_CheckChunkErased(dev, chunk);
309 ("**>> yaffs chunk %d was not erased"
313 yaffs_WriteChunkWithTagsToNAND(dev, chunk,
320 * Copy the data into the robustification buffer.
321 * NB We do this at the end to prevent duplicates in the case of a write error.
324 yaffs_HandleWriteChunkOk(dev, chunk, data,
327 yaffs_HandleWriteChunkError(dev, chunk);
331 } while (chunk >= 0 && !writeOk);
335 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
337 dev->nRetriedWrites += (attempts - 1);
344 * Block retiring for handling a broken block.
347 static void yaffs_RetireBlock(yaffs_Device * dev, int blockInNAND)
350 yaffs_InvalidateCheckpoint(dev);
352 yaffs_MarkBlockBad(dev, blockInNAND);
354 yaffs_GetBlockInfo(dev, blockInNAND)->blockState =
355 YAFFS_BLOCK_STATE_DEAD;
357 dev->nRetiredBlocks++;
361 * Functions for robustisizing TODO
365 static void yaffs_HandleWriteChunkOk(yaffs_Device * dev, int chunkInNAND,
367 const yaffs_ExtendedTags * tags)
371 static void yaffs_HandleUpdateChunk(yaffs_Device * dev, int chunkInNAND,
372 const yaffs_ExtendedTags * tags)
376 static void yaffs_HandleWriteChunkError(yaffs_Device * dev, int chunkInNAND)
378 int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
380 /* Mark the block for retirement */
381 yaffs_GetBlockInfo(dev, blockInNAND)->needsRetiring = 1;
382 /* Delete the chunk */
383 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
387 /*---------------- Name handling functions ------------*/
389 static __u16 yaffs_CalcNameSum(const YCHAR * name)
394 YUCHAR *bname = (YUCHAR *) name;
396 while ((*bname) && (i <= YAFFS_MAX_NAME_LENGTH)) {
398 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
399 sum += yaffs_toupper(*bname) * i;
410 static void yaffs_SetObjectName(yaffs_Object * obj, const YCHAR * name)
412 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
413 if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH) {
414 yaffs_strcpy(obj->shortName, name);
416 obj->shortName[0] = _Y('\0');
419 obj->sum = yaffs_CalcNameSum(name);
422 /*-------------------- TNODES -------------------
424 * List of spare tnodes
425 * The list is hooked together using the first pointer
429 /* yaffs_CreateTnodes creates a bunch more tnodes and
430 * adds them to the tnode free list.
431 * Don't use this function directly
434 static int yaffs_CreateTnodes(yaffs_Device * dev, int nTnodes)
438 yaffs_Tnode *newTnodes;
442 yaffs_TnodeList *tnl;
447 /* Calculate the tnode size in bytes for variable width tnode support.
448 * Must be a multiple of 32-bits */
449 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
451 /* make these things */
453 newTnodes = YMALLOC(nTnodes * tnodeSize);
454 mem = (__u8 *)newTnodes;
458 (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
462 /* Hook them into the free list */
464 for (i = 0; i < nTnodes - 1; i++) {
465 newTnodes[i].internal[0] = &newTnodes[i + 1];
466 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
467 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
471 newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
472 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
473 newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
475 dev->freeTnodes = newTnodes;
477 /* New hookup for wide tnodes */
478 for(i = 0; i < nTnodes -1; i++) {
479 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
480 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
481 curr->internal[0] = next;
484 curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
485 curr->internal[0] = dev->freeTnodes;
486 dev->freeTnodes = (yaffs_Tnode *)mem;
491 dev->nFreeTnodes += nTnodes;
492 dev->nTnodesCreated += nTnodes;
494 /* Now add this bunch of tnodes to a list for freeing up.
495 * NB If we can't add this to the management list it isn't fatal
496 * but it just means we can't free this bunch of tnodes later.
499 tnl = YMALLOC(sizeof(yaffs_TnodeList));
503 ("yaffs: Could not add tnodes to management list" TENDSTR)));
506 tnl->tnodes = newTnodes;
507 tnl->next = dev->allocatedTnodeList;
508 dev->allocatedTnodeList = tnl;
511 T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
516 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
518 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device * dev)
520 yaffs_Tnode *tn = NULL;
522 /* If there are none left make more */
523 if (!dev->freeTnodes) {
524 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
527 if (dev->freeTnodes) {
528 tn = dev->freeTnodes;
529 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
530 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
531 /* Hoosterman, this thing looks like it isn't in the list */
532 T(YAFFS_TRACE_ALWAYS,
533 (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
536 dev->freeTnodes = dev->freeTnodes->internal[0];
543 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device * dev)
545 yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
548 memset(tn, 0, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
553 /* FreeTnode frees up a tnode and puts it back on the free list */
554 static void yaffs_FreeTnode(yaffs_Device * dev, yaffs_Tnode * tn)
557 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
558 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
559 /* Hoosterman, this thing looks like it is already in the list */
560 T(YAFFS_TRACE_ALWAYS,
561 (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
563 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
565 tn->internal[0] = dev->freeTnodes;
566 dev->freeTnodes = tn;
571 static void yaffs_DeinitialiseTnodes(yaffs_Device * dev)
573 /* Free the list of allocated tnodes */
574 yaffs_TnodeList *tmp;
576 while (dev->allocatedTnodeList) {
577 tmp = dev->allocatedTnodeList->next;
579 YFREE(dev->allocatedTnodeList->tnodes);
580 YFREE(dev->allocatedTnodeList);
581 dev->allocatedTnodeList = tmp;
585 dev->freeTnodes = NULL;
586 dev->nFreeTnodes = 0;
589 static void yaffs_InitialiseTnodes(yaffs_Device * dev)
591 dev->allocatedTnodeList = NULL;
592 dev->freeTnodes = NULL;
593 dev->nFreeTnodes = 0;
594 dev->nTnodesCreated = 0;
599 void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos, unsigned val)
601 __u32 *map = (__u32 *)tn;
607 pos &= YAFFS_TNODES_LEVEL0_MASK;
608 val >>= dev->chunkGroupBits;
610 bitInMap = pos * dev->tnodeWidth;
611 wordInMap = bitInMap /32;
612 bitInWord = bitInMap & (32 -1);
614 mask = dev->tnodeMask << bitInWord;
616 map[wordInMap] &= ~mask;
617 map[wordInMap] |= (mask & (val << bitInWord));
619 if(dev->tnodeWidth > (32-bitInWord)) {
620 bitInWord = (32 - bitInWord);
622 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
623 map[wordInMap] &= ~mask;
624 map[wordInMap] |= (mask & (val >> bitInWord));
628 __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos)
630 __u32 *map = (__u32 *)tn;
636 pos &= YAFFS_TNODES_LEVEL0_MASK;
638 bitInMap = pos * dev->tnodeWidth;
639 wordInMap = bitInMap /32;
640 bitInWord = bitInMap & (32 -1);
642 val = map[wordInMap] >> bitInWord;
644 if(dev->tnodeWidth > (32-bitInWord)) {
645 bitInWord = (32 - bitInWord);
647 val |= (map[wordInMap] << bitInWord);
650 val &= dev->tnodeMask;
651 val <<= dev->chunkGroupBits;
656 /* ------------------- End of individual tnode manipulation -----------------*/
658 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
659 * The look up tree is represented by the top tnode and the number of topLevel
660 * in the tree. 0 means only the level 0 tnode is in the tree.
663 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
664 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device * dev,
665 yaffs_FileStructure * fStruct,
669 yaffs_Tnode *tn = fStruct->top;
671 int requiredTallness;
672 int level = fStruct->topLevel;
674 /* Check sane level and chunk Id */
675 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL) {
679 if (chunkId > YAFFS_MAX_CHUNK_ID) {
683 /* First check we're tall enough (ie enough topLevel) */
685 i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
686 requiredTallness = 0;
688 i >>= YAFFS_TNODES_INTERNAL_BITS;
692 if (requiredTallness > fStruct->topLevel) {
693 /* Not tall enough, so we can't find it, return NULL. */
697 /* Traverse down to level 0 */
698 while (level > 0 && tn) {
701 ( YAFFS_TNODES_LEVEL0_BITS +
703 YAFFS_TNODES_INTERNAL_BITS)
705 YAFFS_TNODES_INTERNAL_MASK];
713 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
714 * This happens in two steps:
715 * 1. If the tree isn't tall enough, then make it taller.
716 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
718 * Used when modifying the tree.
720 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
721 * be plugged into the ttree.
724 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device * dev,
725 yaffs_FileStructure * fStruct,
727 yaffs_Tnode *passedTn)
730 int requiredTallness;
738 /* Check sane level and page Id */
739 if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL) {
743 if (chunkId > YAFFS_MAX_CHUNK_ID) {
747 /* First check we're tall enough (ie enough topLevel) */
749 x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
750 requiredTallness = 0;
752 x >>= YAFFS_TNODES_INTERNAL_BITS;
757 if (requiredTallness > fStruct->topLevel) {
758 /* Not tall enough,gotta make the tree taller */
759 for (i = fStruct->topLevel; i < requiredTallness; i++) {
761 tn = yaffs_GetTnode(dev);
764 tn->internal[0] = fStruct->top;
768 (TSTR("yaffs: no more tnodes" TENDSTR)));
772 fStruct->topLevel = requiredTallness;
775 /* Traverse down to level 0, adding anything we need */
777 l = fStruct->topLevel;
781 while (l > 0 && tn) {
783 ( YAFFS_TNODES_LEVEL0_BITS +
784 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
785 YAFFS_TNODES_INTERNAL_MASK;
788 if((l>1) && !tn->internal[x]){
789 /* Add missing non-level-zero tnode */
790 tn->internal[x] = yaffs_GetTnode(dev);
793 /* Looking from level 1 at level 0 */
795 /* If we already have one, then release it.*/
797 yaffs_FreeTnode(dev,tn->internal[x]);
798 tn->internal[x] = passedTn;
800 } else if(!tn->internal[x]) {
801 /* Don't have one, none passed in */
802 tn->internal[x] = yaffs_GetTnode(dev);
806 tn = tn->internal[x];
812 memcpy(tn,passedTn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
813 yaffs_FreeTnode(dev,passedTn);
820 static int yaffs_FindChunkInGroup(yaffs_Device * dev, int theChunk,
821 yaffs_ExtendedTags * tags, int objectId,
826 for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
827 if (yaffs_CheckChunkBit
828 (dev, theChunk / dev->nChunksPerBlock,
829 theChunk % dev->nChunksPerBlock)) {
830 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
832 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
844 /* DeleteWorker scans backwards through the tnode tree and deletes all the
845 * chunks and tnodes in the file
846 * Returns 1 if the tree was deleted.
847 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
850 static int yaffs_DeleteWorker(yaffs_Object * in, yaffs_Tnode * tn, __u32 level,
851 int chunkOffset, int *limit)
856 yaffs_ExtendedTags tags;
858 yaffs_Device *dev = in->myDev;
865 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
867 if (tn->internal[i]) {
868 if (limit && (*limit) < 0) {
872 yaffs_DeleteWorker(in,
880 YAFFS_TNODES_INTERNAL_BITS)
888 tn->internal[i] = NULL;
893 return (allDone) ? 1 : 0;
894 } else if (level == 0) {
897 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
899 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
904 YAFFS_TNODES_LEVEL0_BITS) + i;
907 yaffs_FindChunkInGroup(dev,
913 if (foundChunk > 0) {
914 yaffs_DeleteChunk(dev,
927 yaffs_PutLevel0Tnode(dev,tn,i,0);
931 return (i < 0) ? 1 : 0;
941 static void yaffs_SoftDeleteChunk(yaffs_Device * dev, int chunk)
944 yaffs_BlockInfo *theBlock;
946 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
948 theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
950 theBlock->softDeletions++;
955 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
956 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
958 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
961 static int yaffs_SoftDeleteWorker(yaffs_Object * in, yaffs_Tnode * tn,
962 __u32 level, int chunkOffset)
967 yaffs_Device *dev = in->myDev;
972 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
974 if (tn->internal[i]) {
976 yaffs_SoftDeleteWorker(in,
982 YAFFS_TNODES_INTERNAL_BITS)
988 tn->internal[i] = NULL;
990 /* Hoosterman... how could this happen? */
994 return (allDone) ? 1 : 0;
995 } else if (level == 0) {
997 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
998 theChunk = yaffs_GetChunkGroupBase(dev,tn,i);
1000 /* Note this does not find the real chunk, only the chunk group.
1001 * We make an assumption that a chunk group is not larger than
1004 yaffs_SoftDeleteChunk(dev, theChunk);
1005 yaffs_PutLevel0Tnode(dev,tn,i,0);
1019 static void yaffs_SoftDeleteFile(yaffs_Object * obj)
1022 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1023 if (obj->nDataChunks <= 0) {
1024 /* Empty file with no duplicate object headers, just delete it immediately */
1025 yaffs_FreeTnode(obj->myDev,
1026 obj->variant.fileVariant.top);
1027 obj->variant.fileVariant.top = NULL;
1028 T(YAFFS_TRACE_TRACING,
1029 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1031 yaffs_DoGenericObjectDeletion(obj);
1033 yaffs_SoftDeleteWorker(obj,
1034 obj->variant.fileVariant.top,
1035 obj->variant.fileVariant.
1037 obj->softDeleted = 1;
1042 /* Pruning removes any part of the file structure tree that is beyond the
1043 * bounds of the file (ie that does not point to chunks).
1045 * A file should only get pruned when its size is reduced.
1047 * Before pruning, the chunks must be pulled from the tree and the
1048 * level 0 tnode entries must be zeroed out.
1049 * Could also use this for file deletion, but that's probably better handled
1050 * by a special case.
1053 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device * dev, yaffs_Tnode * tn,
1054 __u32 level, int del0)
1062 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1063 if (tn->internal[i] && level > 0) {
1065 yaffs_PruneWorker(dev, tn->internal[i],
1067 (i == 0) ? del0 : 1);
1070 if (tn->internal[i]) {
1075 if (hasData == 0 && del0) {
1076 /* Free and return NULL */
1078 yaffs_FreeTnode(dev, tn);
1088 static int yaffs_PruneFileStructure(yaffs_Device * dev,
1089 yaffs_FileStructure * fStruct)
1096 if (fStruct->topLevel > 0) {
1098 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1100 /* Now we have a tree with all the non-zero branches NULL but the height
1101 * is the same as it was.
1102 * Let's see if we can trim internal tnodes to shorten the tree.
1103 * We can do this if only the 0th element in the tnode is in use
1104 * (ie all the non-zero are NULL)
1107 while (fStruct->topLevel && !done) {
1111 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1112 if (tn->internal[i]) {
1118 fStruct->top = tn->internal[0];
1119 fStruct->topLevel--;
1120 yaffs_FreeTnode(dev, tn);
1130 /*-------------------- End of File Structure functions.-------------------*/
1132 /* yaffs_CreateFreeObjects creates a bunch more objects and
1133 * adds them to the object free list.
1135 static int yaffs_CreateFreeObjects(yaffs_Device * dev, int nObjects)
1138 yaffs_Object *newObjects;
1139 yaffs_ObjectList *list;
1144 /* make these things */
1145 newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1148 T(YAFFS_TRACE_ALLOCATE,
1149 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1153 /* Hook them into the free list */
1154 for (i = 0; i < nObjects - 1; i++) {
1155 newObjects[i].siblings.next =
1156 (struct list_head *)(&newObjects[i + 1]);
1159 newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1160 dev->freeObjects = newObjects;
1161 dev->nFreeObjects += nObjects;
1162 dev->nObjectsCreated += nObjects;
1164 /* Now add this bunch of Objects to a list for freeing up. */
1166 list = YMALLOC(sizeof(yaffs_ObjectList));
1168 T(YAFFS_TRACE_ALLOCATE,
1169 (TSTR("Could not add objects to management list" TENDSTR)));
1171 list->objects = newObjects;
1172 list->next = dev->allocatedObjectList;
1173 dev->allocatedObjectList = list;
1180 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1181 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device * dev)
1183 yaffs_Object *tn = NULL;
1185 /* If there are none left make more */
1186 if (!dev->freeObjects) {
1187 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1190 if (dev->freeObjects) {
1191 tn = dev->freeObjects;
1193 (yaffs_Object *) (dev->freeObjects->siblings.next);
1194 dev->nFreeObjects--;
1196 /* Now sweeten it up... */
1198 memset(tn, 0, sizeof(yaffs_Object));
1201 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1202 INIT_LIST_HEAD(&(tn->hardLinks));
1203 INIT_LIST_HEAD(&(tn->hashLink));
1204 INIT_LIST_HEAD(&tn->siblings);
1206 /* Add it to the lost and found directory.
1207 * NB Can't put root or lostNFound in lostNFound so
1208 * check if lostNFound exists first
1210 if (dev->lostNFoundDir) {
1211 yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1218 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device * dev, int number,
1223 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1225 obj->fake = 1; /* it is fake so it has no NAND presence... */
1226 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1227 obj->unlinkAllowed = 0; /* ... or unlink it */
1230 obj->yst_mode = mode;
1232 obj->chunkId = 0; /* Not a valid chunk. */
1239 static void yaffs_UnhashObject(yaffs_Object * tn)
1242 yaffs_Device *dev = tn->myDev;
1244 /* If it is still linked into the bucket list, free from the list */
1245 if (!list_empty(&tn->hashLink)) {
1246 list_del_init(&tn->hashLink);
1247 bucket = yaffs_HashFunction(tn->objectId);
1248 dev->objectBucket[bucket].count--;
1253 /* FreeObject frees up a Object and puts it back on the free list */
1254 static void yaffs_FreeObject(yaffs_Object * tn)
1257 yaffs_Device *dev = tn->myDev;
1261 /* We're still hooked up to a cached inode.
1262 * Don't delete now, but mark for later deletion
1264 tn->deferedFree = 1;
1269 yaffs_UnhashObject(tn);
1271 /* Link into the free list. */
1272 tn->siblings.next = (struct list_head *)(dev->freeObjects);
1273 dev->freeObjects = tn;
1274 dev->nFreeObjects++;
1279 void yaffs_HandleDeferedFree(yaffs_Object * obj)
1281 if (obj->deferedFree) {
1282 yaffs_FreeObject(obj);
1288 static void yaffs_DeinitialiseObjects(yaffs_Device * dev)
1290 /* Free the list of allocated Objects */
1292 yaffs_ObjectList *tmp;
1294 while (dev->allocatedObjectList) {
1295 tmp = dev->allocatedObjectList->next;
1296 YFREE(dev->allocatedObjectList->objects);
1297 YFREE(dev->allocatedObjectList);
1299 dev->allocatedObjectList = tmp;
1302 dev->freeObjects = NULL;
1303 dev->nFreeObjects = 0;
1306 static void yaffs_InitialiseObjects(yaffs_Device * dev)
1310 dev->allocatedObjectList = NULL;
1311 dev->freeObjects = NULL;
1312 dev->nFreeObjects = 0;
1314 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
1315 INIT_LIST_HEAD(&dev->objectBucket[i].list);
1316 dev->objectBucket[i].count = 0;
1321 static int yaffs_FindNiceObjectBucket(yaffs_Device * dev)
1326 int lowest = 999999;
1328 /* First let's see if we can find one that's empty. */
1330 for (i = 0; i < 10 && lowest > 0; i++) {
1332 x %= YAFFS_NOBJECT_BUCKETS;
1333 if (dev->objectBucket[x].count < lowest) {
1334 lowest = dev->objectBucket[x].count;
1340 /* If we didn't find an empty list, then try
1341 * looking a bit further for a short one
1344 for (i = 0; i < 10 && lowest > 3; i++) {
1346 x %= YAFFS_NOBJECT_BUCKETS;
1347 if (dev->objectBucket[x].count < lowest) {
1348 lowest = dev->objectBucket[x].count;
1357 static int yaffs_CreateNewObjectNumber(yaffs_Device * dev)
1359 int bucket = yaffs_FindNiceObjectBucket(dev);
1361 /* Now find an object value that has not already been taken
1362 * by scanning the list.
1366 struct list_head *i;
1368 __u32 n = (__u32) bucket;
1370 /* yaffs_CheckObjectHashSanity(); */
1374 n += YAFFS_NOBJECT_BUCKETS;
1375 if (1 || dev->objectBucket[bucket].count > 0) {
1376 list_for_each(i, &dev->objectBucket[bucket].list) {
1377 /* If there is already one in the list */
1379 && list_entry(i, yaffs_Object,
1380 hashLink)->objectId == n) {
1391 static void yaffs_HashObject(yaffs_Object * in)
1393 int bucket = yaffs_HashFunction(in->objectId);
1394 yaffs_Device *dev = in->myDev;
1396 list_add(&in->hashLink, &dev->objectBucket[bucket].list);
1397 dev->objectBucket[bucket].count++;
1401 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device * dev, __u32 number)
1403 int bucket = yaffs_HashFunction(number);
1404 struct list_head *i;
1407 list_for_each(i, &dev->objectBucket[bucket].list) {
1408 /* Look if it is in the list */
1410 in = list_entry(i, yaffs_Object, hashLink);
1411 if (in->objectId == number) {
1413 /* Don't tell the VFS about this one if it is defered free */
1414 if (in->deferedFree)
1426 yaffs_Object *yaffs_CreateNewObject(yaffs_Device * dev, int number,
1427 yaffs_ObjectType type)
1430 yaffs_Object *theObject;
1433 number = yaffs_CreateNewObjectNumber(dev);
1436 theObject = yaffs_AllocateEmptyObject(dev);
1439 theObject->fake = 0;
1440 theObject->renameAllowed = 1;
1441 theObject->unlinkAllowed = 1;
1442 theObject->objectId = number;
1443 yaffs_HashObject(theObject);
1444 theObject->variantType = type;
1445 #ifdef CONFIG_YAFFS_WINCE
1446 yfsd_WinFileTimeNow(theObject->win_atime);
1447 theObject->win_ctime[0] = theObject->win_mtime[0] =
1448 theObject->win_atime[0];
1449 theObject->win_ctime[1] = theObject->win_mtime[1] =
1450 theObject->win_atime[1];
1454 theObject->yst_atime = theObject->yst_mtime =
1455 theObject->yst_ctime = Y_CURRENT_TIME;
1458 case YAFFS_OBJECT_TYPE_FILE:
1459 theObject->variant.fileVariant.fileSize = 0;
1460 theObject->variant.fileVariant.scannedFileSize = 0;
1461 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
1462 theObject->variant.fileVariant.topLevel = 0;
1463 theObject->variant.fileVariant.top =
1464 yaffs_GetTnode(dev);
1466 case YAFFS_OBJECT_TYPE_DIRECTORY:
1467 INIT_LIST_HEAD(&theObject->variant.directoryVariant.
1470 case YAFFS_OBJECT_TYPE_SYMLINK:
1471 case YAFFS_OBJECT_TYPE_HARDLINK:
1472 case YAFFS_OBJECT_TYPE_SPECIAL:
1473 /* No action required */
1475 case YAFFS_OBJECT_TYPE_UNKNOWN:
1476 /* todo this should not happen */
1484 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device * dev,
1486 yaffs_ObjectType type)
1488 yaffs_Object *theObject = NULL;
1491 theObject = yaffs_FindObjectByNumber(dev, number);
1495 theObject = yaffs_CreateNewObject(dev, number, type);
1503 static YCHAR *yaffs_CloneString(const YCHAR * str)
1505 YCHAR *newStr = NULL;
1508 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
1509 yaffs_strcpy(newStr, str);
1517 * Mknod (create) a new object.
1518 * equivalentObject only has meaning for a hard link;
1519 * aliasString only has meaning for a sumlink.
1520 * rdev only has meaning for devices (a subset of special objects)
1523 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
1524 yaffs_Object * parent,
1529 yaffs_Object * equivalentObject,
1530 const YCHAR * aliasString, __u32 rdev)
1534 yaffs_Device *dev = parent->myDev;
1536 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
1537 if (yaffs_FindObjectByName(parent, name)) {
1541 in = yaffs_CreateNewObject(dev, -1, type);
1546 in->variantType = type;
1548 in->yst_mode = mode;
1550 #ifdef CONFIG_YAFFS_WINCE
1551 yfsd_WinFileTimeNow(in->win_atime);
1552 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
1553 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
1556 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
1558 in->yst_rdev = rdev;
1562 in->nDataChunks = 0;
1564 yaffs_SetObjectName(in, name);
1567 yaffs_AddObjectToDirectory(parent, in);
1569 in->myDev = parent->myDev;
1572 case YAFFS_OBJECT_TYPE_SYMLINK:
1573 in->variant.symLinkVariant.alias =
1574 yaffs_CloneString(aliasString);
1576 case YAFFS_OBJECT_TYPE_HARDLINK:
1577 in->variant.hardLinkVariant.equivalentObject =
1579 in->variant.hardLinkVariant.equivalentObjectId =
1580 equivalentObject->objectId;
1581 list_add(&in->hardLinks, &equivalentObject->hardLinks);
1583 case YAFFS_OBJECT_TYPE_FILE:
1584 case YAFFS_OBJECT_TYPE_DIRECTORY:
1585 case YAFFS_OBJECT_TYPE_SPECIAL:
1586 case YAFFS_OBJECT_TYPE_UNKNOWN:
1591 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
1592 /* Could not create the object header, fail the creation */
1593 yaffs_DestroyObject(in);
1602 yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
1603 __u32 mode, __u32 uid, __u32 gid)
1605 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
1606 uid, gid, NULL, NULL, 0);
1609 yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
1610 __u32 mode, __u32 uid, __u32 gid)
1612 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
1613 mode, uid, gid, NULL, NULL, 0);
1616 yaffs_Object *yaffs_MknodSpecial(yaffs_Object * parent, const YCHAR * name,
1617 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
1619 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
1620 uid, gid, NULL, NULL, rdev);
1623 yaffs_Object *yaffs_MknodSymLink(yaffs_Object * parent, const YCHAR * name,
1624 __u32 mode, __u32 uid, __u32 gid,
1625 const YCHAR * alias)
1627 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
1628 uid, gid, NULL, alias, 0);
1631 /* yaffs_Link returns the object id of the equivalent object.*/
1632 yaffs_Object *yaffs_Link(yaffs_Object * parent, const YCHAR * name,
1633 yaffs_Object * equivalentObject)
1635 /* Get the real object in case we were fed a hard link as an equivalent object */
1636 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
1638 if (yaffs_MknodObject
1639 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
1640 equivalentObject, NULL, 0)) {
1641 return equivalentObject;
1648 static int yaffs_ChangeObjectName(yaffs_Object * obj, yaffs_Object * newDir,
1649 const YCHAR * newName, int force, int shadows)
1654 yaffs_Object *existingTarget;
1656 if (newDir == NULL) {
1657 newDir = obj->parent; /* use the old directory */
1660 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
1661 T(YAFFS_TRACE_ALWAYS,
1663 ("tragendy: yaffs_ChangeObjectName: newDir is not a directory"
1668 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
1669 if (obj->myDev->isYaffs2) {
1670 unlinkOp = (newDir == obj->myDev->unlinkedDir);
1672 unlinkOp = (newDir == obj->myDev->unlinkedDir
1673 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
1676 deleteOp = (newDir == obj->myDev->deletedDir);
1678 existingTarget = yaffs_FindObjectByName(newDir, newName);
1680 /* If the object is a file going into the unlinked directory,
1681 * then it is OK to just stuff it in since duplicate names are allowed.
1682 * else only proceed if the new name does not exist and if we're putting
1683 * it into a directory.
1690 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
1691 yaffs_SetObjectName(obj, newName);
1694 yaffs_AddObjectToDirectory(newDir, obj);
1699 /* If it is a deletion then we mark it as a shrink for gc purposes. */
1700 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows)>= 0)
1707 int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
1708 yaffs_Object * newDir, const YCHAR * newName)
1711 yaffs_Object *existingTarget;
1714 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1715 /* Special case for case insemsitive systems (eg. WinCE).
1716 * While look-up is case insensitive, the name isn't.
1717 * Therefore we might want to change x.txt to X.txt
1719 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0) {
1724 obj = yaffs_FindObjectByName(oldDir, oldName);
1726 if (obj && obj->renameAllowed) {
1728 /* Now do the handling for an existing target, if there is one */
1730 existingTarget = yaffs_FindObjectByName(newDir, newName);
1731 if (existingTarget &&
1732 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1733 !list_empty(&existingTarget->variant.directoryVariant.children)) {
1734 /* There is a target that is a non-empty directory, so we fail */
1735 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
1736 } else if (existingTarget && existingTarget != obj) {
1737 /* Nuke the target first, using shadowing,
1738 * but only if it isn't the same object
1740 yaffs_ChangeObjectName(obj, newDir, newName, force,
1741 existingTarget->objectId);
1742 yaffs_UnlinkObject(existingTarget);
1745 return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
1750 /*------------------------- Block Management and Page Allocation ----------------*/
1752 static int yaffs_InitialiseBlocks(yaffs_Device * dev)
1754 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
1756 dev->allocationBlock = -1; /* force it to get a new one */
1758 /* Todo we're assuming the malloc will pass. */
1759 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
1760 if(!dev->blockInfo){
1761 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
1762 dev->blockInfoAlt = 1;
1765 dev->blockInfoAlt = 0;
1767 /* Set up dynamic blockinfo stuff. */
1768 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; // round up bytes
1769 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
1770 if(!dev->chunkBits){
1771 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
1772 dev->chunkBitsAlt = 1;
1775 dev->chunkBitsAlt = 0;
1777 if (dev->blockInfo && dev->chunkBits) {
1778 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
1779 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
1787 static void yaffs_DeinitialiseBlocks(yaffs_Device * dev)
1789 if(dev->blockInfoAlt)
1790 YFREE_ALT(dev->blockInfo);
1792 YFREE(dev->blockInfo);
1793 dev->blockInfoAlt = 0;
1795 dev->blockInfo = NULL;
1797 if(dev->chunkBitsAlt)
1798 YFREE_ALT(dev->chunkBits);
1800 YFREE(dev->chunkBits);
1801 dev->chunkBitsAlt = 0;
1802 dev->chunkBits = NULL;
1805 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device * dev,
1806 yaffs_BlockInfo * bi)
1813 return 1; /* disqualification only applies to yaffs2. */
1815 if (!bi->hasShrinkHeader)
1816 return 1; /* can gc */
1818 /* Find the oldest dirty sequence number if we don't know it and save it
1819 * so we don't have to keep recomputing it.
1821 if (!dev->oldestDirtySequence) {
1822 seq = dev->sequenceNumber;
1824 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
1826 b = yaffs_GetBlockInfo(dev, i);
1827 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
1828 (b->pagesInUse - b->softDeletions) <
1829 dev->nChunksPerBlock && b->sequenceNumber < seq) {
1830 seq = b->sequenceNumber;
1833 dev->oldestDirtySequence = seq;
1836 /* Can't do gc of this block if there are any blocks older than this one that have
1839 return (bi->sequenceNumber <= dev->oldestDirtySequence);
1845 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
1846 * for garbage collection.
1849 static int yaffs_FindBlockForGarbageCollection(yaffs_Device * dev,
1853 int b = dev->currentDirtyChecker;
1859 yaffs_BlockInfo *bi;
1860 static int nonAggressiveSkip = 0;
1862 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
1864 * else (we're doing a leasurely gc), then we only bother to do this if the
1865 * block has only a few pages in use.
1868 nonAggressiveSkip--;
1870 if (!aggressive && (nonAggressiveSkip > 0)) {
1875 (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
1879 dev->internalEndBlock - dev->internalStartBlock + 1;
1882 dev->internalEndBlock - dev->internalStartBlock + 1;
1883 iterations = iterations / 16;
1884 if (iterations > 200) {
1889 for (i = 0; i <= iterations && pagesInUse > 0; i++) {
1891 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
1892 b = dev->internalStartBlock;
1895 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
1896 T(YAFFS_TRACE_ERROR,
1897 (TSTR("**>> Block %d is not valid" TENDSTR), b));
1901 bi = yaffs_GetBlockInfo(dev, b);
1903 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
1904 (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
1905 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
1907 pagesInUse = (bi->pagesInUse - bi->softDeletions);
1911 dev->currentDirtyChecker = b;
1915 (TSTR("GC Selected block %d with %d free" TENDSTR), dirtiest,
1916 dev->nChunksPerBlock - pagesInUse));
1919 dev->oldestDirtySequence = 0;
1922 nonAggressiveSkip = 4;
1928 static void yaffs_BlockBecameDirty(yaffs_Device * dev, int blockNo)
1930 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
1934 /* If the block is still healthy erase it and mark as clean.
1935 * If the block has had a data failure, then retire it.
1937 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
1939 if (!bi->needsRetiring) {
1940 yaffs_InvalidateCheckpoint(dev);
1941 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
1943 dev->nErasureFailures++;
1944 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1945 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
1949 if (erasedOk && (yaffs_traceMask & YAFFS_TRACE_ERASE)) {
1951 for (i = 0; i < dev->nChunksPerBlock; i++) {
1952 if (!yaffs_CheckChunkErased
1953 (dev, blockNo * dev->nChunksPerBlock + i)) {
1954 T(YAFFS_TRACE_ERROR,
1956 (">>Block %d erasure supposedly OK, but chunk %d not erased"
1957 TENDSTR), blockNo, i));
1963 /* Clean it up... */
1964 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
1965 dev->nErasedBlocks++;
1967 bi->softDeletions = 0;
1968 bi->hasShrinkHeader = 0;
1969 yaffs_ClearChunkBits(dev, blockNo);
1971 T(YAFFS_TRACE_ERASE,
1972 (TSTR("Erased block %d" TENDSTR), blockNo));
1974 dev->nFreeChunks -= dev->nChunksPerBlock; /* We lost a block of free space */
1976 yaffs_RetireBlock(dev, blockNo);
1977 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1978 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
1982 static int yaffs_FindBlockForAllocation(yaffs_Device * dev)
1986 yaffs_BlockInfo *bi;
1988 if (dev->nErasedBlocks < 1) {
1989 /* Hoosterman we've got a problem.
1990 * Can't get space to gc
1992 T(YAFFS_TRACE_ERROR,
1993 (TSTR("yaffs tragedy: no more eraased blocks" TENDSTR)));
1998 /* Find an empty block. */
2000 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2001 dev->allocationBlockFinder++;
2002 if (dev->allocationBlockFinder < dev->internalStartBlock
2003 || dev->allocationBlockFinder > dev->internalEndBlock) {
2004 dev->allocationBlockFinder = dev->internalStartBlock;
2007 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2009 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2010 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2011 dev->sequenceNumber++;
2012 bi->sequenceNumber = dev->sequenceNumber;
2013 dev->nErasedBlocks--;
2014 T(YAFFS_TRACE_ALLOCATE,
2015 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
2016 dev->allocationBlockFinder, dev->sequenceNumber,
2017 dev->nErasedBlocks));
2018 return dev->allocationBlockFinder;
2022 T(YAFFS_TRACE_ALWAYS,
2024 ("yaffs tragedy: no more eraased blocks, but there should have been %d"
2025 TENDSTR), dev->nErasedBlocks));
2032 static int yaffs_CheckSpaceForAllocation(yaffs_Device * dev)
2034 int reservedChunks = (dev->nReservedBlocks * dev->nChunksPerBlock);
2035 return (dev->nFreeChunks > reservedChunks);
2038 static int yaffs_AllocateChunk(yaffs_Device * dev, int useReserve)
2041 yaffs_BlockInfo *bi;
2043 if (dev->allocationBlock < 0) {
2044 /* Get next block to allocate off */
2045 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2046 dev->allocationPage = 0;
2049 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2050 /* Not enough space to allocate unless we're allowed to use the reserve. */
2054 if (dev->nErasedBlocks < dev->nReservedBlocks
2055 && dev->allocationPage == 0) {
2056 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2059 /* Next page please.... */
2060 if (dev->allocationBlock >= 0) {
2061 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2063 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2064 dev->allocationPage;
2066 yaffs_SetChunkBit(dev, dev->allocationBlock,
2067 dev->allocationPage);
2069 dev->allocationPage++;
2073 /* If the block is full set the state to full */
2074 if (dev->allocationPage >= dev->nChunksPerBlock) {
2075 bi->blockState = YAFFS_BLOCK_STATE_FULL;
2076 dev->allocationBlock = -1;
2082 T(YAFFS_TRACE_ERROR,
2083 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2088 static int yaffs_GetErasedChunks(yaffs_Device * dev)
2092 n = dev->nErasedBlocks * dev->nChunksPerBlock;
2094 if (dev->allocationBlock > 0) {
2095 n += (dev->nChunksPerBlock - dev->allocationPage);
2102 static int yaffs_GarbageCollectBlock(yaffs_Device * dev, int block)
2108 int retVal = YAFFS_OK;
2112 int chunksBefore = yaffs_GetErasedChunks(dev);
2115 yaffs_ExtendedTags tags;
2117 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2119 yaffs_Object *object;
2121 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2123 T(YAFFS_TRACE_TRACING,
2124 (TSTR("Collecting block %d, in use %d, shrink %d, " TENDSTR), block,
2125 bi->pagesInUse, bi->hasShrinkHeader));
2127 /*yaffs_VerifyFreeChunks(dev); */
2129 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
2131 /* Take off the number of soft deleted entries because
2132 * they're going to get really deleted during GC.
2134 dev->nFreeChunks -= bi->softDeletions;
2138 if (!yaffs_StillSomeChunkBits(dev, block)) {
2139 T(YAFFS_TRACE_TRACING,
2141 ("Collecting block %d that has no chunks in use" TENDSTR),
2143 yaffs_BlockBecameDirty(dev, block);
2146 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
2148 for (chunkInBlock = 0, oldChunk = block * dev->nChunksPerBlock;
2149 chunkInBlock < dev->nChunksPerBlock
2150 && yaffs_StillSomeChunkBits(dev, block);
2151 chunkInBlock++, oldChunk++) {
2152 if (yaffs_CheckChunkBit(dev, block, chunkInBlock)) {
2154 /* This page is in use and might need to be copied off */
2158 yaffs_InitialiseTags(&tags);
2160 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
2164 yaffs_FindObjectByNumber(dev,
2167 T(YAFFS_TRACE_GC_DETAIL,
2169 ("Collecting page %d, %d %d %d " TENDSTR),
2170 chunkInBlock, tags.objectId, tags.chunkId,
2174 T(YAFFS_TRACE_ERROR,
2176 ("page %d in gc has no object "
2177 TENDSTR), oldChunk));
2180 if (object && object->deleted
2181 && tags.chunkId != 0) {
2182 /* Data chunk in a deleted file, throw it away
2183 * It's a soft deleted data chunk,
2184 * No need to copy this, just forget about it and
2185 * fix up the object.
2188 object->nDataChunks--;
2190 if (object->nDataChunks <= 0) {
2191 /* remeber to clean up the object */
2192 dev->gcCleanupList[cleanups] =
2198 /* Todo object && object->deleted && object->nDataChunks == 0 */
2200 /* Deleted object header with no data chunks.
2201 * Can be discarded and the file deleted.
2203 object->chunkId = 0;
2204 yaffs_FreeTnode(object->myDev,
2207 object->variant.fileVariant.top = NULL;
2208 yaffs_DoGenericObjectDeletion(object);
2210 } else if (object) {
2211 /* It's either a data chunk in a live file or
2212 * an ObjectHeader, so we're interested in it.
2213 * NB Need to keep the ObjectHeaders of deleted files
2214 * until the whole file has been deleted off
2216 tags.serialNumber++;
2220 if (tags.chunkId == 0) {
2221 /* It is an object Id,
2222 * We need to nuke the shrinkheader flags first
2223 * We no longer want the shrinkHeader flag since its work is done
2224 * and if it is left in place it will mess up scanning.
2225 * Also, clear out any shadowing stuff
2228 yaffs_ObjectHeader *oh;
2229 oh = (yaffs_ObjectHeader *)buffer;
2231 oh->shadowsObject = -1;
2232 tags.extraShadows = 0;
2233 tags.extraIsShrinkHeader = 0;
2237 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
2240 retVal = YAFFS_FAIL;
2243 /* Ok, now fix up the Tnodes etc. */
2245 if (tags.chunkId == 0) {
2247 object->chunkId = newChunk;
2248 object->serial = tags.serialNumber;
2250 /* It's a data chunk */
2251 yaffs_PutChunkIntoFile
2259 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
2264 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
2267 /* Do any required cleanups */
2268 for (i = 0; i < cleanups; i++) {
2269 /* Time to delete the file too */
2271 yaffs_FindObjectByNumber(dev,
2272 dev->gcCleanupList[i]);
2274 yaffs_FreeTnode(dev,
2275 object->variant.fileVariant.
2277 object->variant.fileVariant.top = NULL;
2280 ("yaffs: About to finally delete object %d"
2281 TENDSTR), object->objectId));
2282 yaffs_DoGenericObjectDeletion(object);
2283 object->myDev->nDeletedFiles--;
2290 if (chunksBefore >= (chunksAfter = yaffs_GetErasedChunks(dev))) {
2293 ("gc did not increase free chunks before %d after %d"
2294 TENDSTR), chunksBefore, chunksAfter));
2302 /* New garbage collector
2303 * If we're very low on erased blocks then we do aggressive garbage collection
2304 * otherwise we do "leasurely" garbage collection.
2305 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2306 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
2308 * The idea is to help clear out space in a more spread-out manner.
2309 * Dunno if it really does anything useful.
2311 static int yaffs_CheckGarbageCollection(yaffs_Device * dev)
2315 int gcOk = YAFFS_OK;
2318 if (dev->isDoingGC) {
2319 /* Bail out so we don't get recursive gc */
2323 /* This loop should pass the first time.
2324 * We'll only see looping here if the erase of the collected block fails.
2329 if (dev->nErasedBlocks < dev->nReservedBlocks) {
2330 /* We need a block soon...*/
2333 /* We're in no hurry */
2337 block = yaffs_FindBlockForGarbageCollection(dev, aggressive);
2340 dev->garbageCollections++;
2342 dev->passiveGarbageCollections++;
2347 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
2348 dev->nErasedBlocks, aggressive));
2350 gcOk = yaffs_GarbageCollectBlock(dev, block);
2353 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
2356 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
2357 TENDSTR), dev->nErasedBlocks, maxTries, block));
2359 } while ((dev->nErasedBlocks < dev->nReservedBlocks) && (block > 0)
2362 return aggressive ? gcOk : YAFFS_OK;
2365 /*------------------------- TAGS --------------------------------*/
2367 static int yaffs_TagsMatch(const yaffs_ExtendedTags * tags, int objectId,
2370 return (tags->chunkId == chunkInObject &&
2371 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
2376 /*-------------------- Data file manipulation -----------------*/
2378 static int yaffs_FindChunkInFile(yaffs_Object * in, int chunkInInode,
2379 yaffs_ExtendedTags * tags)
2381 /*Get the Tnode, then get the level 0 offset chunk offset */
2384 yaffs_ExtendedTags localTags;
2387 yaffs_Device *dev = in->myDev;
2390 /* Passed a NULL, so use our own tags space */
2394 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
2397 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
2400 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
2406 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object * in, int chunkInInode,
2407 yaffs_ExtendedTags * tags)
2409 /* Get the Tnode, then get the level 0 offset chunk offset */
2412 yaffs_ExtendedTags localTags;
2414 yaffs_Device *dev = in->myDev;
2418 /* Passed a NULL, so use our own tags space */
2422 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
2426 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
2429 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
2432 /* Delete the entry in the filestructure (if found) */
2434 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,0);
2437 /*T(("No level 0 found for %d\n", chunkInInode)); */
2441 /* T(("Could not find %d to delete\n",chunkInInode)); */
2446 #ifdef YAFFS_PARANOID
2448 static int yaffs_CheckFileSanity(yaffs_Object * in)
2456 yaffs_Tags localTags;
2457 yaffs_Tags *tags = &localTags;
2461 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
2462 /* T(("Object not a file\n")); */
2466 objId = in->objectId;
2467 fSize = in->variant.fileVariant.fileSize;
2469 (fSize + in->myDev->nBytesPerChunk - 1) / in->myDev->nBytesPerChunk;
2471 for (chunk = 1; chunk <= nChunks; chunk++) {
2472 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
2477 theChunk = yaffs_GetChunkGroupBase(dev,tn,chunk);
2479 if (yaffs_CheckChunkBits
2480 (dev, theChunk / dev->nChunksPerBlock,
2481 theChunk % dev->nChunksPerBlock)) {
2483 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
2487 (tags, in->objectId, chunk, chunkDeleted)) {
2497 /* T(("No level 0 found for %d\n", chunk)); */
2501 return failed ? YAFFS_FAIL : YAFFS_OK;
2506 static int yaffs_PutChunkIntoFile(yaffs_Object * in, int chunkInInode,
2507 int chunkInNAND, int inScan)
2509 /* NB inScan is zero unless scanning.
2510 * For forward scanning, inScan is > 0;
2511 * for backward scanning inScan is < 0
2515 yaffs_Device *dev = in->myDev;
2517 yaffs_ExtendedTags existingTags;
2518 yaffs_ExtendedTags newTags;
2519 unsigned existingSerial, newSerial;
2521 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
2522 /* Just ignore an attempt at putting a chunk into a non-file during scanning
2523 * If it is not during Scanning then something went wrong!
2526 T(YAFFS_TRACE_ERROR,
2528 ("yaffs tragedy:attempt to put data chunk into a non-file"
2533 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
2537 tn = yaffs_AddOrFindLevel0Tnode(dev,
2538 &in->variant.fileVariant,
2545 existingChunk = yaffs_GetChunkGroupBase(dev,tn,chunkInInode);
2548 /* If we're scanning then we need to test for duplicates
2549 * NB This does not need to be efficient since it should only ever
2550 * happen when the power fails during a write, then only one
2551 * chunk should ever be affected.
2553 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
2554 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
2557 if (existingChunk != 0) {
2558 /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
2559 * thus we have to do a FindChunkInFile to get the real chunk id.
2561 * We have a duplicate now we need to decide which one to use:
2563 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
2564 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
2565 * YAFFS1: Get both sets of tags and compare serial numbers.
2569 /* Only do this for forward scanning */
2570 yaffs_ReadChunkWithTagsFromNAND(dev,
2574 /* Do a proper find */
2576 yaffs_FindChunkInFile(in, chunkInInode,
2580 if (existingChunk <= 0) {
2581 /*Hoosterman - how did this happen? */
2583 T(YAFFS_TRACE_ERROR,
2585 ("yaffs tragedy: existing chunk < 0 in scan"
2590 /* NB The deleted flags should be false, otherwise the chunks will
2591 * not be loaded during a scan
2594 newSerial = newTags.serialNumber;
2595 existingSerial = existingTags.serialNumber;
2598 (in->myDev->isYaffs2 ||
2599 existingChunk <= 0 ||
2600 ((existingSerial + 1) & 3) == newSerial)) {
2601 /* Forward scanning.
2603 * Delete the old one and drop through to update the tnode
2605 yaffs_DeleteChunk(dev, existingChunk, 1,
2608 /* Backward scanning or we want to use the existing one
2610 * Delete the new one and return early so that the tnode isn't changed
2612 yaffs_DeleteChunk(dev, chunkInNAND, 1,
2620 if (existingChunk == 0) {
2624 yaffs_PutLevel0Tnode(dev,tn,chunkInInode,chunkInNAND);
2629 static int yaffs_ReadChunkDataFromObject(yaffs_Object * in, int chunkInInode,
2632 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
2634 if (chunkInNAND >= 0) {
2635 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
2638 T(YAFFS_TRACE_NANDACCESS,
2639 (TSTR("Chunk %d not found zero instead" TENDSTR),
2641 /* get sane (zero) data if you read a hole */
2642 memset(buffer, 0, in->myDev->nBytesPerChunk);
2648 void yaffs_DeleteChunk(yaffs_Device * dev, int chunkId, int markNAND, int lyn)
2652 yaffs_ExtendedTags tags;
2653 yaffs_BlockInfo *bi;
2659 block = chunkId / dev->nChunksPerBlock;
2660 page = chunkId % dev->nChunksPerBlock;
2662 bi = yaffs_GetBlockInfo(dev, block);
2664 T(YAFFS_TRACE_DELETION,
2665 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
2668 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
2670 yaffs_InitialiseTags(&tags);
2672 tags.chunkDeleted = 1;
2674 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
2675 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
2677 dev->nUnmarkedDeletions++;
2680 /* Pull out of the management area.
2681 * If the whole block became dirty, this will kick off an erasure.
2683 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
2684 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
2685 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
2686 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
2689 yaffs_ClearChunkBit(dev, block, page);
2693 if (bi->pagesInUse == 0 &&
2694 !bi->hasShrinkHeader &&
2695 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
2696 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
2697 yaffs_BlockBecameDirty(dev, block);
2701 /* T(("Bad news deleting chunk %d\n",chunkId)); */
2706 static int yaffs_WriteChunkDataToObject(yaffs_Object * in, int chunkInInode,
2707 const __u8 * buffer, int nBytes,
2710 /* Find old chunk Need to do this to get serial number
2711 * Write new one and patch into tree.
2712 * Invalidate old tags.
2716 yaffs_ExtendedTags prevTags;
2719 yaffs_ExtendedTags newTags;
2721 yaffs_Device *dev = in->myDev;
2723 yaffs_CheckGarbageCollection(dev);
2725 /* Get the previous chunk at this location in the file if it exists */
2726 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
2728 /* Set up new tags */
2729 yaffs_InitialiseTags(&newTags);
2731 newTags.chunkId = chunkInInode;
2732 newTags.objectId = in->objectId;
2733 newTags.serialNumber =
2734 (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
2735 newTags.byteCount = nBytes;
2738 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
2741 if (newChunkId >= 0) {
2742 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
2744 if (prevChunkId >= 0) {
2745 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
2749 yaffs_CheckFileSanity(in);
2755 /* UpdateObjectHeader updates the header on NAND for an object.
2756 * If name is not NULL, then that new name is used.
2758 int yaffs_UpdateObjectHeader(yaffs_Object * in, const YCHAR * name, int force,
2759 int isShrink, int shadows)
2762 yaffs_BlockInfo *bi;
2764 yaffs_Device *dev = in->myDev;
2770 yaffs_ExtendedTags newTags;
2772 __u8 *buffer = NULL;
2773 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
2775 yaffs_ObjectHeader *oh = NULL;
2777 if (!in->fake || force) {
2779 yaffs_CheckGarbageCollection(dev);
2781 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
2782 oh = (yaffs_ObjectHeader *) buffer;
2784 prevChunkId = in->chunkId;
2786 if (prevChunkId >= 0) {
2787 yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
2789 memcpy(oldName, oh->name, sizeof(oh->name));
2792 memset(buffer, 0xFF, dev->nBytesPerChunk);
2794 oh->type = in->variantType;
2795 oh->yst_mode = in->yst_mode;
2796 oh->shadowsObject = shadows;
2798 #ifdef CONFIG_YAFFS_WINCE
2799 oh->win_atime[0] = in->win_atime[0];
2800 oh->win_ctime[0] = in->win_ctime[0];
2801 oh->win_mtime[0] = in->win_mtime[0];
2802 oh->win_atime[1] = in->win_atime[1];
2803 oh->win_ctime[1] = in->win_ctime[1];
2804 oh->win_mtime[1] = in->win_mtime[1];
2806 oh->yst_uid = in->yst_uid;
2807 oh->yst_gid = in->yst_gid;
2808 oh->yst_atime = in->yst_atime;
2809 oh->yst_mtime = in->yst_mtime;
2810 oh->yst_ctime = in->yst_ctime;
2811 oh->yst_rdev = in->yst_rdev;
2814 oh->parentObjectId = in->parent->objectId;
2816 oh->parentObjectId = 0;
2819 if (name && *name) {
2820 memset(oh->name, 0, sizeof(oh->name));
2821 yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
2822 } else if (prevChunkId) {
2823 memcpy(oh->name, oldName, sizeof(oh->name));
2825 memset(oh->name, 0, sizeof(oh->name));
2828 oh->isShrink = isShrink;
2830 switch (in->variantType) {
2831 case YAFFS_OBJECT_TYPE_UNKNOWN:
2832 /* Should not happen */
2834 case YAFFS_OBJECT_TYPE_FILE:
2836 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
2837 || oh->parentObjectId ==
2838 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
2839 fileVariant.fileSize;
2841 case YAFFS_OBJECT_TYPE_HARDLINK:
2842 oh->equivalentObjectId =
2843 in->variant.hardLinkVariant.equivalentObjectId;
2845 case YAFFS_OBJECT_TYPE_SPECIAL:
2848 case YAFFS_OBJECT_TYPE_DIRECTORY:
2851 case YAFFS_OBJECT_TYPE_SYMLINK:
2852 yaffs_strncpy(oh->alias,
2853 in->variant.symLinkVariant.alias,
2854 YAFFS_MAX_ALIAS_LENGTH);
2855 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
2860 yaffs_InitialiseTags(&newTags);
2862 newTags.chunkId = 0;
2863 newTags.objectId = in->objectId;
2864 newTags.serialNumber = in->serial;
2866 /* Add extra info for file header */
2868 newTags.extraHeaderInfoAvailable = 1;
2869 newTags.extraParentObjectId = oh->parentObjectId;
2870 newTags.extraFileLength = oh->fileSize;
2871 newTags.extraIsShrinkHeader = oh->isShrink;
2872 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
2873 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
2874 newTags.extraObjectType = in->variantType;
2876 /* Create new chunk in NAND */
2878 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
2879 (prevChunkId >= 0) ? 1 : 0);
2881 if (newChunkId >= 0) {
2883 in->chunkId = newChunkId;
2885 if (prevChunkId >= 0) {
2886 yaffs_DeleteChunk(dev, prevChunkId, 1,
2892 /* If this was a shrink, then mark the block that the chunk lives on */
2894 bi = yaffs_GetBlockInfo(in->myDev,
2895 newChunkId /in->myDev-> nChunksPerBlock);
2896 bi->hasShrinkHeader = 1;
2901 retVal = newChunkId;
2906 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
2911 /*------------------------ Short Operations Cache ----------------------------------------
2912 * In many situations where there is no high level buffering (eg WinCE) a lot of
2913 * reads might be short sequential reads, and a lot of writes may be short
2914 * sequential writes. eg. scanning/writing a jpeg file.
2915 * In these cases, a short read/write cache can provide a huge perfomance benefit
2916 * with dumb-as-a-rock code.
2917 * In Linux, the page cache provides read buffering aand the short op cache provides write
2920 * There are a limited number (~10) of cache chunks per device so that we don't
2921 * need a very intelligent search.
2924 static void yaffs_FlushFilesChunkCache(yaffs_Object * obj)
2926 yaffs_Device *dev = obj->myDev;
2927 int lowest = -99; /* Stop compiler whining. */
2929 yaffs_ChunkCache *cache;
2930 int chunkWritten = 0;
2931 int nCaches = obj->myDev->nShortOpCaches;
2937 /* Find the dirty cache for this object with the lowest chunk id. */
2938 for (i = 0; i < nCaches; i++) {
2939 if (dev->srCache[i].object == obj &&
2940 dev->srCache[i].dirty) {
2942 || dev->srCache[i].chunkId <
2944 cache = &dev->srCache[i];
2945 lowest = cache->chunkId;
2950 if (cache && !cache->locked) {
2951 /* Write it out and free it up */
2954 yaffs_WriteChunkDataToObject(cache->object,
2960 cache->object = NULL;
2963 } while (cache && chunkWritten > 0);
2966 /* Hoosterman, disk full while writing cache out. */
2967 T(YAFFS_TRACE_ERROR,
2968 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
2975 /*yaffs_FlushEntireDeviceCache(dev)
2980 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
2983 int nCaches = dev->nShortOpCaches;
2986 /* Find a dirty object in the cache and flush it...
2987 * until there are no further dirty objects.
2991 for( i = 0; i < nCaches && !obj; i++) {
2992 if (dev->srCache[i].object &&
2993 dev->srCache[i].dirty)
2994 obj = dev->srCache[i].object;
2998 yaffs_FlushFilesChunkCache(obj);
3005 /* Grab us a cache chunk for use.
3006 * First look for an empty one.
3007 * Then look for the least recently used non-dirty one.
3008 * Then look for the least recently used dirty one...., flush and look again.
3010 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device * dev)
3016 if (dev->nShortOpCaches > 0) {
3017 for (i = 0; i < dev->nShortOpCaches; i++) {
3018 if (!dev->srCache[i].object)
3019 return &dev->srCache[i];
3025 usage = 0; /* just to stop the compiler grizzling */
3027 for (i = 0; i < dev->nShortOpCaches; i++) {
3028 if (!dev->srCache[i].dirty &&
3029 ((dev->srCache[i].lastUse < usage && theOne >= 0) ||
3031 usage = dev->srCache[i].lastUse;
3037 return theOne >= 0 ? &dev->srCache[theOne] : NULL;
3044 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device * dev)
3046 yaffs_ChunkCache *cache;
3047 yaffs_Object *theObj;
3052 if (dev->nShortOpCaches > 0) {
3053 /* Try find a non-dirty one... */
3055 cache = yaffs_GrabChunkCacheWorker(dev);
3058 /* They were all dirty, find the last recently used object and flush
3059 * its cache, then find again.
3060 * NB what's here is not very accurate, we actually flush the object
3061 * the last recently used page.
3064 /* With locking we can't assume we can use entry zero */
3071 for (i = 0; i < dev->nShortOpCaches; i++) {
3072 if (dev->srCache[i].object &&
3073 !dev->srCache[i].locked &&
3074 (dev->srCache[i].lastUse < usage || !cache))
3076 usage = dev->srCache[i].lastUse;
3077 theObj = dev->srCache[i].object;
3078 cache = &dev->srCache[i];
3083 if (!cache || cache->dirty) {
3084 /* Flush and try again */
3085 yaffs_FlushFilesChunkCache(theObj);
3086 cache = yaffs_GrabChunkCacheWorker(dev);
3096 /* Find a cached chunk */
3097 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object * obj,
3100 yaffs_Device *dev = obj->myDev;
3102 if (dev->nShortOpCaches > 0) {
3103 for (i = 0; i < dev->nShortOpCaches; i++) {
3104 if (dev->srCache[i].object == obj &&
3105 dev->srCache[i].chunkId == chunkId) {
3108 return &dev->srCache[i];
3115 /* Mark the chunk for the least recently used algorithym */
3116 static void yaffs_UseChunkCache(yaffs_Device * dev, yaffs_ChunkCache * cache,
3120 if (dev->nShortOpCaches > 0) {
3121 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
3122 /* Reset the cache usages */
3124 for (i = 1; i < dev->nShortOpCaches; i++) {
3125 dev->srCache[i].lastUse = 0;
3132 cache->lastUse = dev->srLastUse;
3140 /* Invalidate a single cache page.
3141 * Do this when a whole page gets written,
3142 * ie the short cache for this page is no longer valid.
3144 static void yaffs_InvalidateChunkCache(yaffs_Object * object, int chunkId)
3146 if (object->myDev->nShortOpCaches > 0) {
3147 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
3150 cache->object = NULL;
3155 /* Invalidate all the cache pages associated with this object
3156 * Do this whenever ther file is deleted or resized.
3158 static void yaffs_InvalidateWholeChunkCache(yaffs_Object * in)
3161 yaffs_Device *dev = in->myDev;
3163 if (dev->nShortOpCaches > 0) {
3164 /* Invalidate it. */
3165 for (i = 0; i < dev->nShortOpCaches; i++) {
3166 if (dev->srCache[i].object == in) {
3167 dev->srCache[i].object = NULL;
3173 /*--------------------- Checkpointing --------------------*/
3176 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev,int head)
3178 yaffs_CheckpointValidity cp;
3179 cp.structType = sizeof(cp);
3180 cp.magic = YAFFS_MAGIC;
3182 cp.head = (head) ? 1 : 0;
3184 return (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp))?
3188 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
3190 yaffs_CheckpointValidity cp;
3193 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
3196 ok = (cp.structType == sizeof(cp)) &&
3197 (cp.magic == YAFFS_MAGIC) &&
3198 (cp.version == 1) &&
3199 (cp.head == ((head) ? 1 : 0));
3203 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
3206 cp->nErasedBlocks = dev->nErasedBlocks;
3207 cp->allocationBlock = dev->allocationBlock;
3208 cp->allocationPage = dev->allocationPage;
3209 cp->nFreeChunks = dev->nFreeChunks;
3211 cp->nDeletedFiles = dev->nDeletedFiles;
3212 cp->nUnlinkedFiles = dev->nUnlinkedFiles;
3213 cp->nBackgroundDeletions = dev->nBackgroundDeletions;
3214 cp->sequenceNumber = dev->sequenceNumber;
3215 cp->oldestDirtySequence = dev->oldestDirtySequence;
3219 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
3220 yaffs_CheckpointDevice *cp)
3222 dev->nErasedBlocks = cp->nErasedBlocks;
3223 dev->allocationBlock = cp->allocationBlock;
3224 dev->allocationPage = cp->allocationPage;
3225 dev->nFreeChunks = cp->nFreeChunks;
3227 dev->nDeletedFiles = cp->nDeletedFiles;
3228 dev->nUnlinkedFiles = cp->nUnlinkedFiles;
3229 dev->nBackgroundDeletions = cp->nBackgroundDeletions;
3230 dev->sequenceNumber = cp->sequenceNumber;
3231 dev->oldestDirtySequence = cp->oldestDirtySequence;
3235 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
3237 yaffs_CheckpointDevice cp;
3239 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
3243 /* Write device runtime values*/
3244 yaffs_DeviceToCheckpointDevice(&cp,dev);
3245 cp.structType = sizeof(cp);
3247 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
3249 /* Write block info */
3251 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
3252 ok = (yaffs_CheckpointWrite(dev,dev->blockInfo,nBytes) == nBytes);
3255 /* Write chunk bits */
3257 nBytes = nBlocks * dev->chunkBitmapStride;
3258 ok = (yaffs_CheckpointWrite(dev,dev->chunkBits,nBytes) == nBytes);
3264 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
3266 yaffs_CheckpointDevice cp;
3268 __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
3272 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
3276 if(cp.structType != sizeof(cp))
3280 yaffs_CheckpointDeviceToDevice(dev,&cp);
3282 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
3284 ok = (yaffs_CheckpointRead(dev,dev->blockInfo,nBytes) == nBytes);
3288 nBytes = nBlocks * dev->chunkBitmapStride;
3290 ok = (yaffs_CheckpointRead(dev,dev->chunkBits,nBytes) == nBytes);
3295 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
3299 cp->objectId = obj->objectId;
3300 cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
3301 cp->chunkId = obj->chunkId;
3302 cp->variantType = obj->variantType;
3303 cp->deleted = obj->deleted;
3304 cp->softDeleted = obj->softDeleted;
3305 cp->unlinked = obj->unlinked;
3306 cp->fake = obj->fake;
3307 cp->renameAllowed = obj->renameAllowed;
3308 cp->unlinkAllowed = obj->unlinkAllowed;
3309 cp->serial = obj->serial;
3310 cp->nDataChunks = obj->nDataChunks;
3312 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
3313 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
3314 else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
3315 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
3318 static void yaffs_CheckpointObjectToObject( yaffs_Object *obj,yaffs_CheckpointObject *cp)
3321 yaffs_Object *parent;
3323 obj->objectId = cp->objectId;
3326 parent = yaffs_FindOrCreateObjectByNumber(
3329 YAFFS_OBJECT_TYPE_DIRECTORY);
3334 yaffs_AddObjectToDirectory(parent, obj);
3336 obj->chunkId = cp->chunkId;
3337 obj->variantType = cp->variantType;
3338 obj->deleted = cp->deleted;
3339 obj->softDeleted = cp->softDeleted;
3340 obj->unlinked = cp->unlinked;
3341 obj->fake = cp->fake;
3342 obj->renameAllowed = cp->renameAllowed;
3343 obj->unlinkAllowed = cp->unlinkAllowed;
3344 obj->serial = cp->serial;
3345 obj->nDataChunks = cp->nDataChunks;
3347 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
3348 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
3349 else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
3350 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
3352 if(obj->objectId >= YAFFS_NOBJECT_BUCKETS)
3353 obj->lazyLoaded = 1;
3358 static int yaffs_CheckpointTnodeWorker(yaffs_Object * in, yaffs_Tnode * tn,
3359 __u32 level, int chunkOffset)
3362 yaffs_Device *dev = in->myDev;
3367 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++){
3368 if (tn->internal[i]) {
3369 yaffs_CheckpointTnodeWorker(in,
3372 (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
3375 } else if (level == 0) {
3376 __u32 baseOffset = chunkOffset << YAFFS_TNODES_LEVEL0_BITS;
3377 /* printf("write tnode at %d\n",baseOffset); */
3378 yaffs_CheckpointWrite(dev,&baseOffset,sizeof(baseOffset));
3379 yaffs_CheckpointWrite(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
3387 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
3389 __u32 endMarker = ~0;
3392 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE){
3393 ok = yaffs_CheckpointTnodeWorker(obj,
3394 obj->variant.fileVariant.top,
3395 obj->variant.fileVariant.topLevel,
3398 ok = (yaffs_CheckpointWrite(obj->myDev,&endMarker,sizeof(endMarker)) ==
3405 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
3409 yaffs_Device *dev = obj->myDev;
3410 yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
3413 ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
3415 while(ok && (~baseChunk)){
3416 /* Read level 0 tnode */
3418 /* printf("read tnode at %d\n",baseChunk); */
3419 tn = yaffs_GetTnodeRaw(dev);
3421 ok = (yaffs_CheckpointRead(dev,tn,(dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8) ==
3422 (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
3427 ok = yaffs_AddOrFindLevel0Tnode(dev,
3434 ok = (yaffs_CheckpointRead(dev,&baseChunk,sizeof(baseChunk)) == sizeof(baseChunk));
3442 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
3445 yaffs_CheckpointObject cp;
3448 struct list_head *lh;
3451 /* Iterate through the objects in each hash entry,
3452 * dumping them to the checkpointing stream.
3455 for(i = 0; ok && i < YAFFS_NOBJECT_BUCKETS; i++){
3456 list_for_each(lh, &dev->objectBucket[i].list) {
3458 obj = list_entry(lh, yaffs_Object, hashLink);
3459 if (!obj->deferedFree) {
3460 yaffs_ObjectToCheckpointObject(&cp,obj);
3461 cp.structType = sizeof(cp);
3462 /* printf("Write out object %d type %d\n",obj->objectId,obj->variantType); */
3463 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
3465 if(ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE){
3466 ok = yaffs_WriteCheckpointTnodes(obj);
3473 /* Dump end of list */
3474 memset(&cp,0xFF,sizeof(yaffs_CheckpointObject));
3475 cp.structType = sizeof(cp);
3478 ok = (yaffs_CheckpointWrite(dev,&cp,sizeof(cp)) == sizeof(cp));
3483 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
3486 yaffs_CheckpointObject cp;
3489 yaffs_Object *hardList = NULL;
3491 while(ok && !done) {
3492 ok = (yaffs_CheckpointRead(dev,&cp,sizeof(cp)) == sizeof(cp));
3493 if(cp.structType != sizeof(cp)) {
3494 /* printf("structure parsing failed\n"); */
3498 if(ok && cp.objectId == ~0)
3501 /* printf("Read object %d type %d\n",cp.objectId,cp.variantType); */
3502 obj = yaffs_FindOrCreateObjectByNumber(dev,cp.objectId, cp.variantType);
3504 yaffs_CheckpointObjectToObject(obj,&cp);
3505 if(obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
3506 yaffs_ReadCheckpointTnodes(obj);
3507 } else if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
3508 obj->hardLinks.next =
3509 (struct list_head *)
3519 yaffs_HardlinkFixup(dev,hardList);
3524 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
3529 ok = yaffs_CheckpointOpen(dev,1);
3532 ok = yaffs_WriteCheckpointValidityMarker(dev,1);
3534 ok = yaffs_WriteCheckpointDevice(dev);
3536 ok = yaffs_WriteCheckpointObjects(dev);
3538 ok = yaffs_WriteCheckpointValidityMarker(dev,0);
3540 yaffs_CheckpointClose(dev);
3543 dev->isCheckpointed = 1;
3545 dev->isCheckpointed = 0;
3547 return dev->isCheckpointed;
3550 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
3554 ok = yaffs_CheckpointOpen(dev,0); /* open for read */
3557 ok = yaffs_ReadCheckpointValidityMarker(dev,1);
3559 ok = yaffs_ReadCheckpointDevice(dev);
3561 ok = yaffs_ReadCheckpointObjects(dev);
3563 ok = yaffs_ReadCheckpointValidityMarker(dev,0);
3567 dev->isCheckpointed = 1;
3569 dev->isCheckpointed = 0;
3571 yaffs_CheckpointClose(dev);
3577 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
3579 if(dev->isCheckpointed){
3580 dev->isCheckpointed = 0;
3581 yaffs_CheckpointInvalidateStream(dev);
3586 int yaffs_CheckpointSave(yaffs_Device *dev)
3588 if(!dev->isCheckpointed)
3589 yaffs_WriteCheckpointData(dev);
3591 return dev->isCheckpointed;
3594 int yaffs_CheckpointRestore(yaffs_Device *dev)
3597 return yaffs_ReadCheckpointData(dev);
3600 /*--------------------- File read/write ------------------------
3601 * Read and write have very similar structures.
3602 * In general the read/write has three parts to it
3603 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3604 * Some complete chunks
3605 * An incomplete chunk to end off with
3607 * Curve-balls: the first chunk might also be the last chunk.
3610 int yaffs_ReadDataFromFile(yaffs_Object * in, __u8 * buffer, __u32 offset,
3619 yaffs_ChunkCache *cache;
3626 chunk = offset / dev->nBytesPerChunk + 1; /* The first chunk is 1 */
3627 start = offset % dev->nBytesPerChunk;
3629 /* OK now check for the curveball where the start and end are in
3632 if ((start + n) < dev->nBytesPerChunk) {
3635 nToCopy = dev->nBytesPerChunk - start;
3638 cache = yaffs_FindChunkCache(in, chunk);
3640 /* If the chunk is already in the cache or it is less than a whole chunk
3641 * then use the cache (if there is caching)
3642 * else bypass the cache.
3644 if (cache || nToCopy != dev->nBytesPerChunk) {
3645 if (dev->nShortOpCaches > 0) {
3647 /* If we can't find the data in the cache, then load it up. */
3650 cache = yaffs_GrabChunkCache(in->myDev);
3652 cache->chunkId = chunk;
3655 yaffs_ReadChunkDataFromObject(in, chunk,
3661 yaffs_UseChunkCache(dev, cache, 0);
3665 #ifdef CONFIG_YAFFS_WINCE
3666 yfsd_UnlockYAFFS(TRUE);
3668 memcpy(buffer, &cache->data[start], nToCopy);
3670 #ifdef CONFIG_YAFFS_WINCE
3671 yfsd_LockYAFFS(TRUE);
3675 /* Read into the local buffer then copy..*/
3678 yaffs_GetTempBuffer(dev, __LINE__);
3679 yaffs_ReadChunkDataFromObject(in, chunk,
3681 #ifdef CONFIG_YAFFS_WINCE
3682 yfsd_UnlockYAFFS(TRUE);
3684 memcpy(buffer, &localBuffer[start], nToCopy);
3686 #ifdef CONFIG_YAFFS_WINCE
3687 yfsd_LockYAFFS(TRUE);
3689 yaffs_ReleaseTempBuffer(dev, localBuffer,
3694 #ifdef CONFIG_YAFFS_WINCE
3695 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
3697 /* Under WinCE can't do direct transfer. Need to use a local buffer.
3698 * This is because we otherwise screw up WinCE's memory mapper
3700 yaffs_ReadChunkDataFromObject(in, chunk, localBuffer);
3702 #ifdef CONFIG_YAFFS_WINCE
3703 yfsd_UnlockYAFFS(TRUE);
3705 memcpy(buffer, localBuffer, dev->nBytesPerChunk);
3707 #ifdef CONFIG_YAFFS_WINCE
3708 yfsd_LockYAFFS(TRUE);
3709 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
3713 /* A full chunk. Read directly into the supplied buffer. */
3714 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
3728 int yaffs_WriteDataToFile(yaffs_Object * in, const __u8 * buffer, __u32 offset,
3729 int nBytes, int writeThrough)
3738 int startOfWrite = offset;
3739 int chunkWritten = 0;
3746 while (n > 0 && chunkWritten >= 0) {
3747 chunk = offset / dev->nBytesPerChunk + 1;
3748 start = offset % dev->nBytesPerChunk;
3750 /* OK now check for the curveball where the start and end are in
3754 if ((start + n) < dev->nBytesPerChunk) {
3757 /* Now folks, to calculate how many bytes to write back....
3758 * If we're overwriting and not writing to then end of file then
3759 * we need to write back as much as was there before.
3763 in->variant.fileVariant.fileSize -
3764 ((chunk - 1) * dev->nBytesPerChunk);
3766 if (nBytesRead > dev->nBytesPerChunk) {
3767 nBytesRead = dev->nBytesPerChunk;
3772 (start + n)) ? nBytesRead : (start + n);
3775 nToCopy = dev->nBytesPerChunk - start;
3776 nToWriteBack = dev->nBytesPerChunk;
3779 if (nToCopy != dev->nBytesPerChunk) {
3780 /* An incomplete start or end chunk (or maybe both start and end chunk) */
3781 if (dev->nShortOpCaches > 0) {
3782 yaffs_ChunkCache *cache;
3783 /* If we can't find the data in the cache, then load the cache */
3784 cache = yaffs_FindChunkCache(in, chunk);
3786 && yaffs_CheckSpaceForAllocation(in->
3788 cache = yaffs_GrabChunkCache(in->myDev);
3790 cache->chunkId = chunk;
3793 yaffs_ReadChunkDataFromObject(in, chunk,
3799 yaffs_UseChunkCache(dev, cache, 1);
3801 #ifdef CONFIG_YAFFS_WINCE
3802 yfsd_UnlockYAFFS(TRUE);
3805 memcpy(&cache->data[start], buffer,
3808 #ifdef CONFIG_YAFFS_WINCE
3809 yfsd_LockYAFFS(TRUE);
3812 cache->nBytes = nToWriteBack;
3816 yaffs_WriteChunkDataToObject
3819 cache->data, cache->nBytes,
3825 chunkWritten = -1; /* fail the write */
3828 /* An incomplete start or end chunk (or maybe both start and end chunk)
3829 * Read into the local buffer then copy, then copy over and write back.
3833 yaffs_GetTempBuffer(dev, __LINE__);
3835 yaffs_ReadChunkDataFromObject(in, chunk,
3838 #ifdef CONFIG_YAFFS_WINCE
3839 yfsd_UnlockYAFFS(TRUE);
3842 memcpy(&localBuffer[start], buffer, nToCopy);
3844 #ifdef CONFIG_YAFFS_WINCE
3845 yfsd_LockYAFFS(TRUE);
3848 yaffs_WriteChunkDataToObject(in, chunk,
3853 yaffs_ReleaseTempBuffer(dev, localBuffer,
3860 #ifdef CONFIG_YAFFS_WINCE
3861 /* Under WinCE can't do direct transfer. Need to use a local buffer.
3862 * This is because we otherwise screw up WinCE's memory mapper
3864 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
3865 #ifdef CONFIG_YAFFS_WINCE
3866 yfsd_UnlockYAFFS(TRUE);
3868 memcpy(localBuffer, buffer, dev->nBytesPerChunk);
3869 #ifdef CONFIG_YAFFS_WINCE
3870 yfsd_LockYAFFS(TRUE);
3873 yaffs_WriteChunkDataToObject(in, chunk, localBuffer,
3874 dev->nBytesPerChunk,
3876 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
3878 /* A full chunk. Write directly from the supplied buffer. */
3880 yaffs_WriteChunkDataToObject(in, chunk, buffer,
3881 dev->nBytesPerChunk,
3884 /* Since we've overwritten the cached data, we better invalidate it. */
3885 yaffs_InvalidateChunkCache(in, chunk);
3888 if (chunkWritten >= 0) {
3897 /* Update file object */
3899 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize) {
3900 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
3909 /* ---------------------- File resizing stuff ------------------ */
3911 static void yaffs_PruneResizedChunks(yaffs_Object * in, int newSize)
3914 yaffs_Device *dev = in->myDev;
3915 int oldFileSize = in->variant.fileVariant.fileSize;
3917 int lastDel = 1 + (oldFileSize - 1) / dev->nBytesPerChunk;
3919 int startDel = 1 + (newSize + dev->nBytesPerChunk - 1) /
3920 dev->nBytesPerChunk;
3924 /* Delete backwards so that we don't end up with holes if
3925 * power is lost part-way through the operation.
3927 for (i = lastDel; i >= startDel; i--) {
3928 /* NB this could be optimised somewhat,
3929 * eg. could retrieve the tags and write them without
3930 * using yaffs_DeleteChunk
3933 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
3936 (dev->internalStartBlock * dev->nChunksPerBlock)
3938 ((dev->internalEndBlock +
3939 1) * dev->nChunksPerBlock)) {
3940 T(YAFFS_TRACE_ALWAYS,
3941 (TSTR("Found daft chunkId %d for %d" TENDSTR),
3945 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
3952 int yaffs_ResizeFile(yaffs_Object * in, int newSize)
3955 int oldFileSize = in->variant.fileVariant.fileSize;
3956 int sizeOfPartialChunk;
3957 yaffs_Device *dev = in->myDev;
3959 sizeOfPartialChunk = newSize % dev->nBytesPerChunk;
3961 yaffs_FlushFilesChunkCache(in);
3962 yaffs_InvalidateWholeChunkCache(in);
3964 yaffs_CheckGarbageCollection(dev);
3966 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3967 return yaffs_GetFileSize(in);
3970 if (newSize == oldFileSize) {
3974 if (newSize < oldFileSize) {
3976 yaffs_PruneResizedChunks(in, newSize);
3978 if (sizeOfPartialChunk != 0) {
3979 int lastChunk = 1 + newSize / dev->nBytesPerChunk;
3980 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
3982 /* Got to read and rewrite the last chunk with its new size and zero pad */
3983 yaffs_ReadChunkDataFromObject(in, lastChunk,
3986 memset(localBuffer + sizeOfPartialChunk, 0,
3987 dev->nBytesPerChunk - sizeOfPartialChunk);
3989 yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
3990 sizeOfPartialChunk, 1);
3992 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
3995 in->variant.fileVariant.fileSize = newSize;
3997 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
3999 /* Write a new object header.
4000 * show we've shrunk the file, if need be
4001 * Do this only if the file is not in the deleted directories.
4003 if (in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
4004 in->parent->objectId != YAFFS_OBJECTID_DELETED) {
4005 yaffs_UpdateObjectHeader(in, NULL, 0,
4006 (newSize < oldFileSize) ? 1 : 0, 0);
4012 loff_t yaffs_GetFileSize(yaffs_Object * obj)
4014 obj = yaffs_GetEquivalentObject(obj);
4016 switch (obj->variantType) {
4017 case YAFFS_OBJECT_TYPE_FILE:
4018 return obj->variant.fileVariant.fileSize;
4019 case YAFFS_OBJECT_TYPE_SYMLINK:
4020 return yaffs_strlen(obj->variant.symLinkVariant.alias);
4028 int yaffs_FlushFile(yaffs_Object * in, int updateTime)
4032 yaffs_FlushFilesChunkCache(in);
4034 #ifdef CONFIG_YAFFS_WINCE
4035 yfsd_WinFileTimeNow(in->win_mtime);
4038 in->yst_mtime = Y_CURRENT_TIME;
4044 (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
4045 0) ? YAFFS_OK : YAFFS_FAIL;
4054 static int yaffs_DoGenericObjectDeletion(yaffs_Object * in)
4057 /* First off, invalidate the file's data in the cache, without flushing. */
4058 yaffs_InvalidateWholeChunkCache(in);
4060 if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
4061 /* Move to the unlinked directory so we have a record that it was deleted. */
4062 yaffs_ChangeObjectName(in, in->myDev->deletedDir, NULL, 0, 0);
4066 yaffs_RemoveObjectFromDirectory(in);
4067 yaffs_DeleteChunk(in->myDev, in->chunkId, 1, __LINE__);
4070 yaffs_FreeObject(in);
4075 /* yaffs_DeleteFile deletes the whole file data
4076 * and the inode associated with the file.
4077 * It does not delete the links associated with the file.
4079 static int yaffs_UnlinkFile(yaffs_Object * in)
4083 int immediateDeletion = 0;
4088 immediateDeletion = 1;
4092 if (in->inUse <= 0) {
4093 immediateDeletion = 1;
4097 if (immediateDeletion) {
4099 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
4101 T(YAFFS_TRACE_TRACING,
4102 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
4105 in->myDev->nDeletedFiles++;
4106 if (0 && in->myDev->isYaffs2) {
4107 yaffs_ResizeFile(in, 0);
4109 yaffs_SoftDeleteFile(in);
4112 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
4120 int yaffs_DeleteFile(yaffs_Object * in)
4122 int retVal = YAFFS_OK;
4124 if (in->nDataChunks > 0) {
4125 /* Use soft deletion if there is data in the file */
4126 if (!in->unlinked) {
4127 retVal = yaffs_UnlinkFile(in);
4129 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
4131 in->myDev->nDeletedFiles++;
4132 yaffs_SoftDeleteFile(in);
4134 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
4136 /* The file has no data chunks so we toss it immediately */
4137 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
4138 in->variant.fileVariant.top = NULL;
4139 yaffs_DoGenericObjectDeletion(in);
4145 static int yaffs_DeleteDirectory(yaffs_Object * in)
4147 /* First check that the directory is empty. */
4148 if (list_empty(&in->variant.directoryVariant.children)) {
4149 return yaffs_DoGenericObjectDeletion(in);
4156 static int yaffs_DeleteSymLink(yaffs_Object * in)
4158 YFREE(in->variant.symLinkVariant.alias);
4160 return yaffs_DoGenericObjectDeletion(in);
4163 static int yaffs_DeleteHardLink(yaffs_Object * in)
4165 /* remove this hardlink from the list assocaited with the equivalent
4168 list_del(&in->hardLinks);
4169 return yaffs_DoGenericObjectDeletion(in);
4172 static void yaffs_DestroyObject(yaffs_Object * obj)
4174 switch (obj->variantType) {
4175 case YAFFS_OBJECT_TYPE_FILE:
4176 yaffs_DeleteFile(obj);
4178 case YAFFS_OBJECT_TYPE_DIRECTORY:
4179 yaffs_DeleteDirectory(obj);
4181 case YAFFS_OBJECT_TYPE_SYMLINK:
4182 yaffs_DeleteSymLink(obj);
4184 case YAFFS_OBJECT_TYPE_HARDLINK:
4185 yaffs_DeleteHardLink(obj);
4187 case YAFFS_OBJECT_TYPE_SPECIAL:
4188 yaffs_DoGenericObjectDeletion(obj);
4190 case YAFFS_OBJECT_TYPE_UNKNOWN:
4191 break; /* should not happen. */
4195 static int yaffs_UnlinkWorker(yaffs_Object * obj)
4198 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4199 return yaffs_DeleteHardLink(obj);
4200 } else if (!list_empty(&obj->hardLinks)) {
4201 /* Curve ball: We're unlinking an object that has a hardlink.
4203 * This problem arises because we are not strictly following
4204 * The Linux link/inode model.
4206 * We can't really delete the object.
4207 * Instead, we do the following:
4208 * - Select a hardlink.
4209 * - Unhook it from the hard links
4210 * - Unhook it from its parent directory (so that the rename can work)
4211 * - Rename the object to the hardlink's name.
4212 * - Delete the hardlink
4217 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
4219 hl = list_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
4221 list_del_init(&hl->hardLinks);
4222 list_del_init(&hl->siblings);
4224 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
4226 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
4228 if (retVal == YAFFS_OK) {
4229 retVal = yaffs_DoGenericObjectDeletion(hl);
4234 switch (obj->variantType) {
4235 case YAFFS_OBJECT_TYPE_FILE:
4236 return yaffs_UnlinkFile(obj);
4238 case YAFFS_OBJECT_TYPE_DIRECTORY:
4239 return yaffs_DeleteDirectory(obj);
4241 case YAFFS_OBJECT_TYPE_SYMLINK:
4242 return yaffs_DeleteSymLink(obj);
4244 case YAFFS_OBJECT_TYPE_SPECIAL:
4245 return yaffs_DoGenericObjectDeletion(obj);
4247 case YAFFS_OBJECT_TYPE_HARDLINK:
4248 case YAFFS_OBJECT_TYPE_UNKNOWN:
4256 static int yaffs_UnlinkObject( yaffs_Object *obj)
4259 if (obj && obj->unlinkAllowed) {
4260 return yaffs_UnlinkWorker(obj);
4266 int yaffs_Unlink(yaffs_Object * dir, const YCHAR * name)
4270 obj = yaffs_FindObjectByName(dir, name);
4271 return yaffs_UnlinkObject(obj);
4274 /*----------------------- Initialisation Scanning ---------------------- */
4276 static void yaffs_HandleShadowedObject(yaffs_Device * dev, int objId,
4277 int backwardScanning)
4281 if (!backwardScanning) {
4282 /* Handle YAFFS1 forward scanning case
4283 * For YAFFS1 we always do the deletion
4287 /* Handle YAFFS2 case (backward scanning)
4288 * If the shadowed object exists then ignore.
4290 if (yaffs_FindObjectByNumber(dev, objId)) {
4295 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
4296 * We put it in unlinked dir to be cleaned up after the scanning
4299 yaffs_FindOrCreateObjectByNumber(dev, objId,
4300 YAFFS_OBJECT_TYPE_FILE);
4301 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
4302 obj->variant.fileVariant.shrinkSize = 0;
4303 obj->valid = 1; /* So that we don't read any other info for this file */
4313 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
4320 hardList = (yaffs_Object *) (hardList->hardLinks.next);
4322 in = yaffs_FindObjectByNumber(dev,
4323 hl->variant.hardLinkVariant.
4324 equivalentObjectId);
4327 /* Add the hardlink pointers */
4328 hl->variant.hardLinkVariant.equivalentObject = in;
4329 list_add(&hl->hardLinks, &in->hardLinks);
4331 /* Todo Need to report/handle this better.
4332 * Got a problem... hardlink to a non-existant object
4334 hl->variant.hardLinkVariant.equivalentObject = NULL;
4335 INIT_LIST_HEAD(&hl->hardLinks);
4347 static int yaffs_Scan(yaffs_Device * dev)
4349 yaffs_ExtendedTags tags;
4354 int nBlocksToScan = 0;
4359 yaffs_BlockState state;
4360 yaffs_Object *hardList = NULL;
4362 yaffs_BlockInfo *bi;
4364 yaffs_ObjectHeader *oh;
4366 yaffs_Object *parent;
4367 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
4371 yaffs_BlockIndex *blockIndex = NULL;
4374 (TSTR("yaffs_Scan starts intstartblk %d intendblk %d..." TENDSTR),
4375 dev->internalStartBlock, dev->internalEndBlock));
4377 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
4379 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
4381 if (dev->isYaffs2) {
4382 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
4385 /* Scan all the blocks to determine their state */
4386 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
4387 bi = yaffs_GetBlockInfo(dev, blk);
4388 yaffs_ClearChunkBits(dev, blk);
4390 bi->softDeletions = 0;
4392 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
4394 bi->blockState = state;
4395 bi->sequenceNumber = sequenceNumber;
4397 T(YAFFS_TRACE_SCAN_DEBUG,
4398 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
4399 state, sequenceNumber));
4401 if (state == YAFFS_BLOCK_STATE_DEAD) {
4402 T(YAFFS_TRACE_BAD_BLOCKS,
4403 (TSTR("block %d is bad" TENDSTR), blk));
4404 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
4405 T(YAFFS_TRACE_SCAN_DEBUG,
4406 (TSTR("Block empty " TENDSTR)));
4407 dev->nErasedBlocks++;
4408 dev->nFreeChunks += dev->nChunksPerBlock;
4409 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4411 /* Determine the highest sequence number */
4412 if (dev->isYaffs2 &&
4413 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
4414 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
4416 blockIndex[nBlocksToScan].seq = sequenceNumber;
4417 blockIndex[nBlocksToScan].block = blk;
4421 if (sequenceNumber >= dev->sequenceNumber) {
4422 dev->sequenceNumber = sequenceNumber;
4424 } else if (dev->isYaffs2) {
4425 /* TODO: Nasty sequence number! */
4428 ("Block scanning block %d has bad sequence number %d"
4429 TENDSTR), blk, sequenceNumber));
4436 * Dungy old bubble sort for now...
4438 if (dev->isYaffs2) {
4439 yaffs_BlockIndex temp;
4443 for (i = 0; i < nBlocksToScan; i++)
4444 for (j = i + 1; j < nBlocksToScan; j++)
4445 if (blockIndex[i].seq > blockIndex[j].seq) {
4446 temp = blockIndex[j];
4447 blockIndex[j] = blockIndex[i];
4448 blockIndex[i] = temp;
4452 /* Now scan the blocks looking at the data. */
4453 if (dev->isYaffs2) {
4455 endIterator = nBlocksToScan - 1;
4456 T(YAFFS_TRACE_SCAN_DEBUG,
4457 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
4459 startIterator = dev->internalStartBlock;
4460 endIterator = dev->internalEndBlock;
4463 /* For each block.... */
4464 for (blockIterator = startIterator; blockIterator <= endIterator;
4467 if (dev->isYaffs2) {
4468 /* get the block to scan in the correct order */
4469 blk = blockIndex[blockIterator].block;
4471 blk = blockIterator;
4474 bi = yaffs_GetBlockInfo(dev, blk);
4475 state = bi->blockState;
4479 /* For each chunk in each block that needs scanning....*/
4480 for (c = 0; c < dev->nChunksPerBlock &&
4481 state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
4482 /* Read the tags and decide what to do */
4483 chunk = blk * dev->nChunksPerBlock + c;
4485 yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
4488 /* Let's have a good look at this chunk... */
4490 if (!dev->isYaffs2 && tags.chunkDeleted) {
4496 /*T((" %d %d deleted\n",blk,c)); */
4497 } else if (!tags.chunkUsed) {
4498 /* An unassigned chunk in the block
4499 * This means that either the block is empty or
4500 * this is the one being allocated from
4504 /* We're looking at the first chunk in the block so the block is unused */
4505 state = YAFFS_BLOCK_STATE_EMPTY;
4506 dev->nErasedBlocks++;
4508 /* this is the block being allocated from */
4511 (" Allocating from %d %d" TENDSTR),
4513 state = YAFFS_BLOCK_STATE_ALLOCATING;
4514 dev->allocationBlock = blk;
4515 dev->allocationPage = c;
4516 dev->allocationBlockFinder = blk;
4517 /* Set it to here to encourage the allocator to go forth from here. */
4519 /* Yaffs2 sanity check:
4520 * This should be the one with the highest sequence number
4523 && (dev->sequenceNumber !=
4524 bi->sequenceNumber)) {
4525 T(YAFFS_TRACE_ALWAYS,
4527 ("yaffs: Allocation block %d was not highest sequence id:"
4528 " block seq = %d, dev seq = %d"
4529 TENDSTR), blk,bi->sequenceNumber,dev->sequenceNumber));
4533 dev->nFreeChunks += (dev->nChunksPerBlock - c);
4534 } else if (tags.chunkId > 0) {
4535 /* chunkId > 0 so it is a data chunk... */
4536 unsigned int endpos;
4538 yaffs_SetChunkBit(dev, blk, c);
4541 in = yaffs_FindOrCreateObjectByNumber(dev,
4544 YAFFS_OBJECT_TYPE_FILE);
4545 /* PutChunkIntoFile checks for a clash (two data chunks with
4546 * the same chunkId).
4548 yaffs_PutChunkIntoFile(in, tags.chunkId, chunk,
4551 (tags.chunkId - 1) * dev->nBytesPerChunk +
4553 if (in->variantType == YAFFS_OBJECT_TYPE_FILE
4554 && in->variant.fileVariant.scannedFileSize <
4556 in->variant.fileVariant.
4557 scannedFileSize = endpos;
4558 if (!dev->useHeaderFileSize) {
4559 in->variant.fileVariant.
4561 in->variant.fileVariant.
4566 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId)); */
4568 /* chunkId == 0, so it is an ObjectHeader.
4569 * Thus, we read in the object header and make the object
4571 yaffs_SetChunkBit(dev, blk, c);
4574 yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
4578 oh = (yaffs_ObjectHeader *) chunkData;
4580 in = yaffs_FindObjectByNumber(dev,
4582 if (in && in->variantType != oh->type) {
4583 /* This should not happen, but somehow
4584 * Wev'e ended up with an objectId that has been reused but not yet
4585 * deleted, and worse still it has changed type. Delete the old object.
4588 yaffs_DestroyObject(in);
4593 in = yaffs_FindOrCreateObjectByNumber(dev,
4598 if (oh->shadowsObject > 0) {
4599 yaffs_HandleShadowedObject(dev,
4606 /* We have already filled this one. We have a duplicate and need to resolve it. */
4608 unsigned existingSerial = in->serial;
4609 unsigned newSerial = tags.serialNumber;
4611 if (dev->isYaffs2 ||
4612 ((existingSerial + 1) & 3) ==
4614 /* Use new one - destroy the exisiting one */
4615 yaffs_DeleteChunk(dev,
4620 /* Use existing - destroy this one. */
4621 yaffs_DeleteChunk(dev, chunk, 1,
4627 (tags.objectId == YAFFS_OBJECTID_ROOT ||
4628 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
4629 /* We only load some info, don't fiddle with directory structure */
4631 in->variantType = oh->type;
4633 in->yst_mode = oh->yst_mode;
4634 #ifdef CONFIG_YAFFS_WINCE
4635 in->win_atime[0] = oh->win_atime[0];
4636 in->win_ctime[0] = oh->win_ctime[0];
4637 in->win_mtime[0] = oh->win_mtime[0];
4638 in->win_atime[1] = oh->win_atime[1];
4639 in->win_ctime[1] = oh->win_ctime[1];
4640 in->win_mtime[1] = oh->win_mtime[1];
4642 in->yst_uid = oh->yst_uid;
4643 in->yst_gid = oh->yst_gid;
4644 in->yst_atime = oh->yst_atime;
4645 in->yst_mtime = oh->yst_mtime;
4646 in->yst_ctime = oh->yst_ctime;
4647 in->yst_rdev = oh->yst_rdev;
4649 in->chunkId = chunk;
4651 } else if (!in->valid) {
4652 /* we need to load this info */
4655 in->variantType = oh->type;
4657 in->yst_mode = oh->yst_mode;
4658 #ifdef CONFIG_YAFFS_WINCE
4659 in->win_atime[0] = oh->win_atime[0];
4660 in->win_ctime[0] = oh->win_ctime[0];
4661 in->win_mtime[0] = oh->win_mtime[0];
4662 in->win_atime[1] = oh->win_atime[1];
4663 in->win_ctime[1] = oh->win_ctime[1];
4664 in->win_mtime[1] = oh->win_mtime[1];
4666 in->yst_uid = oh->yst_uid;
4667 in->yst_gid = oh->yst_gid;
4668 in->yst_atime = oh->yst_atime;
4669 in->yst_mtime = oh->yst_mtime;
4670 in->yst_ctime = oh->yst_ctime;
4671 in->yst_rdev = oh->yst_rdev;
4673 in->chunkId = chunk;
4675 yaffs_SetObjectName(in, oh->name);
4678 /* directory stuff...
4683 yaffs_FindOrCreateObjectByNumber
4684 (dev, oh->parentObjectId,
4685 YAFFS_OBJECT_TYPE_DIRECTORY);
4686 if (parent->variantType ==
4687 YAFFS_OBJECT_TYPE_UNKNOWN) {
4688 /* Set up as a directory */
4689 parent->variantType =
4690 YAFFS_OBJECT_TYPE_DIRECTORY;
4691 INIT_LIST_HEAD(&parent->variant.
4694 } else if (parent->variantType !=
4695 YAFFS_OBJECT_TYPE_DIRECTORY)
4697 /* Hoosterman, another problem....
4698 * We're trying to use a non-directory as a directory
4701 T(YAFFS_TRACE_ERROR,
4703 ("yaffs tragedy: attempting to use non-directory as"
4704 " a directory in scan. Put in lost+found."
4706 parent = dev->lostNFoundDir;
4709 yaffs_AddObjectToDirectory(parent, in);
4711 if (0 && (parent == dev->deletedDir ||
4712 parent == dev->unlinkedDir)) {
4713 in->deleted = 1; /* If it is unlinked at start up then it wants deleting */
4714 dev->nDeletedFiles++;
4716 /* Note re hardlinks.
4717 * Since we might scan a hardlink before its equivalent object is scanned
4718 * we put them all in a list.
4719 * After scanning is complete, we should have all the objects, so we run through this
4720 * list and fix up all the chains.
4723 switch (in->variantType) {
4724 case YAFFS_OBJECT_TYPE_UNKNOWN:
4725 /* Todo got a problem */
4727 case YAFFS_OBJECT_TYPE_FILE:
4730 /* Prune back the shrunken chunks */
4731 yaffs_PruneResizedChunks
4733 /* Mark the block as having a shrinkHeader */
4734 bi->hasShrinkHeader = 1;
4737 if (dev->useHeaderFileSize)
4739 in->variant.fileVariant.
4744 case YAFFS_OBJECT_TYPE_HARDLINK:
4745 in->variant.hardLinkVariant.
4746 equivalentObjectId =
4747 oh->equivalentObjectId;
4748 in->hardLinks.next =
4749 (struct list_head *)
4753 case YAFFS_OBJECT_TYPE_DIRECTORY:
4756 case YAFFS_OBJECT_TYPE_SPECIAL:
4759 case YAFFS_OBJECT_TYPE_SYMLINK:
4760 in->variant.symLinkVariant.
4762 yaffs_CloneString(oh->alias);
4766 if (parent == dev->deletedDir) {
4767 yaffs_DestroyObject(in);
4768 bi->hasShrinkHeader = 1;
4774 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4775 /* If we got this far while scanning, then the block is fully allocated.*/
4776 state = YAFFS_BLOCK_STATE_FULL;
4779 bi->blockState = state;
4781 /* Now let's see if it was dirty */
4782 if (bi->pagesInUse == 0 &&
4783 !bi->hasShrinkHeader &&
4784 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
4785 yaffs_BlockBecameDirty(dev, blk);
4795 /* Ok, we've done all the scanning.
4796 * Fix up the hard link chains.
4797 * We should now have scanned all the objects, now it's time to add these
4801 yaffs_HardlinkFixup(dev,hardList);
4803 /* Handle the unlinked files. Since they were left in an unlinked state we should
4807 struct list_head *i;
4808 struct list_head *n;
4811 /* Soft delete all the unlinked files */
4812 list_for_each_safe(i, n,
4813 &dev->unlinkedDir->variant.directoryVariant.
4816 l = list_entry(i, yaffs_Object, siblings);
4817 yaffs_DestroyObject(l);
4822 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
4824 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
4829 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
4832 yaffs_ObjectHeader *oh;
4833 yaffs_Device *dev = in->myDev;
4837 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
4839 yaffs_ReadChunkWithTagsFromNAND(dev,in->chunkId,chunkData,NULL);
4840 oh = (yaffs_ObjectHeader *) chunkData;
4842 in->yst_mode = oh->yst_mode;
4843 #ifdef CONFIG_YAFFS_WINCE
4844 in->win_atime[0] = oh->win_atime[0];
4845 in->win_ctime[0] = oh->win_ctime[0];
4846 in->win_mtime[0] = oh->win_mtime[0];
4847 in->win_atime[1] = oh->win_atime[1];
4848 in->win_ctime[1] = oh->win_ctime[1];
4849 in->win_mtime[1] = oh->win_mtime[1];
4851 in->yst_uid = oh->yst_uid;
4852 in->yst_gid = oh->yst_gid;
4853 in->yst_atime = oh->yst_atime;
4854 in->yst_mtime = oh->yst_mtime;
4855 in->yst_ctime = oh->yst_ctime;
4856 in->yst_rdev = oh->yst_rdev;
4859 yaffs_SetObjectName(in, oh->name);
4861 if(in->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
4862 in->variant.symLinkVariant.alias =
4863 yaffs_CloneString(oh->alias);
4865 yaffs_ReleaseTempBuffer(dev,chunkData, __LINE__);
4869 static int yaffs_ScanBackwards(yaffs_Device * dev)
4871 yaffs_ExtendedTags tags;
4876 int nBlocksToScan = 0;
4881 yaffs_BlockState state;
4882 yaffs_Object *hardList = NULL;
4883 yaffs_BlockInfo *bi;
4885 yaffs_ObjectHeader *oh;
4887 yaffs_Object *parent;
4888 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
4894 int equivalentObjectId;
4897 yaffs_BlockIndex *blockIndex = NULL;
4899 if (!dev->isYaffs2) {
4901 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
4907 ("yaffs_ScanBackwards starts intstartblk %d intendblk %d..."
4908 TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
4910 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
4912 dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
4914 blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
4916 /* Scan all the blocks to determine their state */
4917 for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
4918 bi = yaffs_GetBlockInfo(dev, blk);
4919 yaffs_ClearChunkBits(dev, blk);
4921 bi->softDeletions = 0;
4923 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
4925 bi->blockState = state;
4926 bi->sequenceNumber = sequenceNumber;
4928 T(YAFFS_TRACE_SCAN_DEBUG,
4929 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
4930 state, sequenceNumber));
4932 if (state == YAFFS_BLOCK_STATE_DEAD) {
4933 T(YAFFS_TRACE_BAD_BLOCKS,
4934 (TSTR("block %d is bad" TENDSTR), blk));
4935 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
4936 T(YAFFS_TRACE_SCAN_DEBUG,
4937 (TSTR("Block empty " TENDSTR)));
4938 dev->nErasedBlocks++;
4939 dev->nFreeChunks += dev->nChunksPerBlock;
4940 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
4942 /* Determine the highest sequence number */
4943 if (dev->isYaffs2 &&
4944 sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
4945 sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
4947 blockIndex[nBlocksToScan].seq = sequenceNumber;
4948 blockIndex[nBlocksToScan].block = blk;
4952 if (sequenceNumber >= dev->sequenceNumber) {
4953 dev->sequenceNumber = sequenceNumber;
4955 } else if (dev->isYaffs2) {
4956 /* TODO: Nasty sequence number! */
4959 ("Block scanning block %d has bad sequence number %d"
4960 TENDSTR), blk, sequenceNumber));
4968 * Dungy old bubble sort for now...
4971 yaffs_BlockIndex temp;
4975 for (i = 0; i < nBlocksToScan; i++)
4976 for (j = i + 1; j < nBlocksToScan; j++)
4977 if (blockIndex[i].seq > blockIndex[j].seq) {
4978 temp = blockIndex[j];
4979 blockIndex[j] = blockIndex[i];
4980 blockIndex[i] = temp;
4984 /* Now scan the blocks looking at the data. */
4986 endIterator = nBlocksToScan - 1;
4987 T(YAFFS_TRACE_SCAN_DEBUG,
4988 (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
4990 /* For each block.... backwards */
4991 for (blockIterator = endIterator; blockIterator >= startIterator;
4994 /* get the block to scan in the correct order */
4995 blk = blockIndex[blockIterator].block;
4997 bi = yaffs_GetBlockInfo(dev, blk);
4998 state = bi->blockState;
5002 /* For each chunk in each block that needs scanning.... */
5003 for (c = dev->nChunksPerBlock - 1; c >= 0 &&
5004 (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
5005 state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
5006 /* Scan backwards...
5007 * Read the tags and decide what to do
5009 chunk = blk * dev->nChunksPerBlock + c;
5011 yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5014 /* Let's have a good look at this chunk... */
5016 if (!tags.chunkUsed) {
5017 // An unassigned chunk in the block
5018 // This means that either the block is empty or
5019 // this is the one being allocated from
5022 /* We're looking at the first chunk in the block so the block is unused */
5023 state = YAFFS_BLOCK_STATE_EMPTY;
5024 dev->nErasedBlocks++;
5026 /* this is the block being allocated from */
5028 YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5031 (" Allocating from %d %d"
5034 state = YAFFS_BLOCK_STATE_ALLOCATING;
5035 dev->allocationBlock = blk;
5036 dev->allocationPage = c;
5037 dev->allocationBlockFinder = blk;
5038 /* Set it to here to encourage the allocator to
5039 * go forth from here.
5042 /* Yaffs2 sanity check:
5043 * This should be the one with the highest sequence number
5046 && (dev->sequenceNumber !=
5047 bi->sequenceNumber)) {
5048 T(YAFFS_TRACE_ALWAYS,
5050 ("yaffs: Allocation block %d was not highest sequence "
5051 "id: block seq = %d, dev seq = %d"
5054 dev->sequenceNumber));
5059 } else if (tags.chunkId > 0) {
5060 /* chunkId > 0 so it is a data chunk... */
5061 unsigned int endpos;
5064 (tags.chunkId - 1) * dev->nBytesPerChunk;
5066 yaffs_SetChunkBit(dev, blk, c);
5069 in = yaffs_FindOrCreateObjectByNumber(dev,
5072 YAFFS_OBJECT_TYPE_FILE);
5073 if (in->variantType == YAFFS_OBJECT_TYPE_FILE
5075 in->variant.fileVariant.shrinkSize) {
5076 /* This has not been invalidated by a resize */
5077 yaffs_PutChunkIntoFile(in, tags.chunkId,
5080 /* File size is calculated by looking at the data chunks if we have not
5081 * seen an object header yet. Stop this practice once we find an object header.
5085 1) * dev->nBytesPerChunk +
5088 if (!in->valid && /* have not got an object header yet */
5089 in->variant.fileVariant.
5090 scannedFileSize < endpos) {
5091 in->variant.fileVariant.
5092 scannedFileSize = endpos;
5093 in->variant.fileVariant.
5095 in->variant.fileVariant.
5100 /* This chunk has been invalidated by a resize, so delete */
5101 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
5105 /* chunkId == 0, so it is an ObjectHeader.
5106 * Thus, we read in the object header and make the object
5108 yaffs_SetChunkBit(dev, blk, c);
5114 if (tags.extraHeaderInfoAvailable) {
5115 in = yaffs_FindOrCreateObjectByNumber
5116 (dev, tags.objectId,
5117 tags.extraObjectType);
5121 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
5124 tags.extraShadows ||
5126 (tags.objectId == YAFFS_OBJECTID_ROOT ||
5127 tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
5130 /* If we don't have valid info then we need to read the chunk
5131 * TODO In future we can probably defer reading the chunk and
5132 * living with invalid data until needed.
5135 yaffs_ReadChunkWithTagsFromNAND(dev,
5140 oh = (yaffs_ObjectHeader *) chunkData;
5143 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
5148 /* TODO Hoosterman we have a problem! */
5149 T(YAFFS_TRACE_ERROR,
5151 ("yaffs tragedy: Could not make object for object %d "
5152 "at chunk %d during scan"
5153 TENDSTR), tags.objectId, chunk));
5158 /* We have already filled this one.
5159 * We have a duplicate that will be discarded, but
5160 * we first have to suck out resize info if it is a file.
5163 if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
5165 oh-> type == YAFFS_OBJECT_TYPE_FILE)||
5166 (tags.extraHeaderInfoAvailable &&
5167 tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))
5170 (oh) ? oh->fileSize : tags.
5172 __u32 parentObjectId =
5174 parentObjectId : tags.
5175 extraParentObjectId;
5177 (oh) ? oh->isShrink : tags.
5178 extraIsShrinkHeader;
5180 /* If it is deleted (unlinked at start also means deleted)
5181 * we treat the file size as being zeroed at this point.
5183 if (parentObjectId ==
5184 YAFFS_OBJECTID_DELETED
5185 || parentObjectId ==
5186 YAFFS_OBJECTID_UNLINKED) {
5192 in->variant.fileVariant.
5193 shrinkSize > thisSize) {
5194 in->variant.fileVariant.
5200 bi->hasShrinkHeader = 1;
5204 /* Use existing - destroy this one. */
5205 yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
5210 (tags.objectId == YAFFS_OBJECTID_ROOT ||
5212 YAFFS_OBJECTID_LOSTNFOUND)) {
5213 /* We only load some info, don't fiddle with directory structure */
5217 in->variantType = oh->type;
5219 in->yst_mode = oh->yst_mode;
5220 #ifdef CONFIG_YAFFS_WINCE
5221 in->win_atime[0] = oh->win_atime[0];
5222 in->win_ctime[0] = oh->win_ctime[0];
5223 in->win_mtime[0] = oh->win_mtime[0];
5224 in->win_atime[1] = oh->win_atime[1];
5225 in->win_ctime[1] = oh->win_ctime[1];
5226 in->win_mtime[1] = oh->win_mtime[1];
5228 in->yst_uid = oh->yst_uid;
5229 in->yst_gid = oh->yst_gid;
5230 in->yst_atime = oh->yst_atime;
5231 in->yst_mtime = oh->yst_mtime;
5232 in->yst_ctime = oh->yst_ctime;
5233 in->yst_rdev = oh->yst_rdev;
5237 in->variantType = tags.extraObjectType;
5241 in->chunkId = chunk;
5243 } else if (!in->valid) {
5244 /* we need to load this info */
5247 in->chunkId = chunk;
5250 in->variantType = oh->type;
5252 in->yst_mode = oh->yst_mode;
5253 #ifdef CONFIG_YAFFS_WINCE
5254 in->win_atime[0] = oh->win_atime[0];
5255 in->win_ctime[0] = oh->win_ctime[0];
5256 in->win_mtime[0] = oh->win_mtime[0];
5257 in->win_atime[1] = oh->win_atime[1];
5258 in->win_ctime[1] = oh->win_ctime[1];
5259 in->win_mtime[1] = oh->win_mtime[1];
5261 in->yst_uid = oh->yst_uid;
5262 in->yst_gid = oh->yst_gid;
5263 in->yst_atime = oh->yst_atime;
5264 in->yst_mtime = oh->yst_mtime;
5265 in->yst_ctime = oh->yst_ctime;
5266 in->yst_rdev = oh->yst_rdev;
5269 if (oh->shadowsObject > 0)
5270 yaffs_HandleShadowedObject(dev,
5276 yaffs_SetObjectName(in, oh->name);
5278 yaffs_FindOrCreateObjectByNumber
5279 (dev, oh->parentObjectId,
5280 YAFFS_OBJECT_TYPE_DIRECTORY);
5282 fileSize = oh->fileSize;
5283 isShrink = oh->isShrink;
5284 equivalentObjectId = oh->equivalentObjectId;
5288 in->variantType = tags.extraObjectType;
5290 yaffs_FindOrCreateObjectByNumber
5291 (dev, tags.extraParentObjectId,
5292 YAFFS_OBJECT_TYPE_DIRECTORY);
5293 fileSize = tags.extraFileLength;
5294 isShrink = tags.extraIsShrinkHeader;
5295 equivalentObjectId = tags.extraEquivalentObjectId;
5301 /* directory stuff...
5305 if (parent->variantType ==
5306 YAFFS_OBJECT_TYPE_UNKNOWN) {
5307 /* Set up as a directory */
5308 parent->variantType =
5309 YAFFS_OBJECT_TYPE_DIRECTORY;
5310 INIT_LIST_HEAD(&parent->variant.
5313 } else if (parent->variantType !=
5314 YAFFS_OBJECT_TYPE_DIRECTORY)
5316 /* Hoosterman, another problem....
5317 * We're trying to use a non-directory as a directory
5320 T(YAFFS_TRACE_ERROR,
5322 ("yaffs tragedy: attempting to use non-directory as"
5323 " a directory in scan. Put in lost+found."
5325 parent = dev->lostNFoundDir;
5328 yaffs_AddObjectToDirectory(parent, in);
5330 itsUnlinked = (parent == dev->deletedDir) ||
5331 (parent == dev->unlinkedDir);
5334 /* Mark the block as having a shrinkHeader */
5335 bi->hasShrinkHeader = 1;
5338 /* Note re hardlinks.
5339 * Since we might scan a hardlink before its equivalent object is scanned
5340 * we put them all in a list.
5341 * After scanning is complete, we should have all the objects, so we run
5342 * through this list and fix up all the chains.
5345 switch (in->variantType) {
5346 case YAFFS_OBJECT_TYPE_UNKNOWN:
5347 /* Todo got a problem */
5349 case YAFFS_OBJECT_TYPE_FILE:
5351 if (in->variant.fileVariant.
5352 scannedFileSize < fileSize) {
5353 /* This covers the case where the file size is greater
5354 * than where the data is
5355 * This will happen if the file is resized to be larger
5356 * than its current data extents.
5358 in->variant.fileVariant.fileSize = fileSize;
5359 in->variant.fileVariant.scannedFileSize =
5360 in->variant.fileVariant.fileSize;
5364 in->variant.fileVariant.shrinkSize > fileSize) {
5365 in->variant.fileVariant.shrinkSize = fileSize;
5369 case YAFFS_OBJECT_TYPE_HARDLINK:
5371 in->variant.hardLinkVariant.equivalentObjectId =
5373 in->hardLinks.next =
5374 (struct list_head *) hardList;
5378 case YAFFS_OBJECT_TYPE_DIRECTORY:
5381 case YAFFS_OBJECT_TYPE_SPECIAL:
5384 case YAFFS_OBJECT_TYPE_SYMLINK:
5386 in->variant.symLinkVariant.alias =
5387 yaffs_CloneString(oh->
5396 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5397 /* If we got this far while scanning, then the block is fully allocated. */
5398 state = YAFFS_BLOCK_STATE_FULL;
5401 bi->blockState = state;
5403 /* Now let's see if it was dirty */
5404 if (bi->pagesInUse == 0 &&
5405 !bi->hasShrinkHeader &&
5406 bi->blockState == YAFFS_BLOCK_STATE_FULL) {
5407 yaffs_BlockBecameDirty(dev, blk);
5415 /* Ok, we've done all the scanning.
5416 * Fix up the hard link chains.
5417 * We should now have scanned all the objects, now it's time to add these
5420 yaffs_HardlinkFixup(dev,hardList);
5424 * Sort out state of unlinked and deleted objects.
5427 struct list_head *i;
5428 struct list_head *n;
5432 /* Soft delete all the unlinked files */
5433 list_for_each_safe(i, n,
5434 &dev->unlinkedDir->variant.directoryVariant.
5437 l = list_entry(i, yaffs_Object, siblings);
5438 yaffs_DestroyObject(l);
5442 /* Soft delete all the deletedDir files */
5443 list_for_each_safe(i, n,
5444 &dev->deletedDir->variant.directoryVariant.
5447 l = list_entry(i, yaffs_Object, siblings);
5448 yaffs_DestroyObject(l);
5454 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5456 T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
5461 /*------------------------------ Directory Functions ----------------------------- */
5463 static void yaffs_RemoveObjectFromDirectory(yaffs_Object * obj)
5465 yaffs_Device *dev = obj->myDev;
5467 if(dev && dev->removeObjectCallback)
5468 dev->removeObjectCallback(obj);
5470 list_del_init(&obj->siblings);
5475 static void yaffs_AddObjectToDirectory(yaffs_Object * directory,
5480 T(YAFFS_TRACE_ALWAYS,
5482 ("tragedy: Trying to add an object to a null pointer directory"
5486 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
5487 T(YAFFS_TRACE_ALWAYS,
5489 ("tragedy: Trying to add an object to a non-directory"
5494 if (obj->siblings.prev == NULL) {
5495 /* Not initialised */
5496 INIT_LIST_HEAD(&obj->siblings);
5498 } else if (!list_empty(&obj->siblings)) {
5499 /* If it is holed up somewhere else, un hook it */
5500 yaffs_RemoveObjectFromDirectory(obj);
5503 list_add(&obj->siblings, &directory->variant.directoryVariant.children);
5504 obj->parent = directory;
5506 if (directory == obj->myDev->unlinkedDir
5507 || directory == obj->myDev->deletedDir) {
5509 obj->myDev->nUnlinkedFiles++;
5510 obj->renameAllowed = 0;
5514 yaffs_Object *yaffs_FindObjectByName(yaffs_Object * directory,
5519 struct list_head *i;
5520 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
5529 T(YAFFS_TRACE_ALWAYS,
5531 ("tragedy: yaffs_FindObjectByName: null pointer directory"
5535 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
5536 T(YAFFS_TRACE_ALWAYS,
5538 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
5542 sum = yaffs_CalcNameSum(name);
5544 list_for_each(i, &directory->variant.directoryVariant.children) {
5546 l = list_entry(i, yaffs_Object, siblings);
5548 yaffs_CheckObjectDetailsLoaded(l);
5550 /* Special case for lost-n-found */
5551 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
5552 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0) {
5555 } else if (yaffs_SumCompare(l->sum, sum) || l->chunkId <= 0)
5557 /* LostnFound cunk called Objxxx
5560 yaffs_GetObjectName(l, buffer,
5561 YAFFS_MAX_NAME_LENGTH);
5562 if (yaffs_strcmp(name, buffer) == 0) {
5575 int yaffs_ApplyToDirectoryChildren(yaffs_Object * theDir,
5576 int (*fn) (yaffs_Object *))
5578 struct list_head *i;
5582 T(YAFFS_TRACE_ALWAYS,
5584 ("tragedy: yaffs_FindObjectByName: null pointer directory"
5588 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
5589 T(YAFFS_TRACE_ALWAYS,
5591 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
5595 list_for_each(i, &theDir->variant.directoryVariant.children) {
5597 l = list_entry(i, yaffs_Object, siblings);
5609 /* GetEquivalentObject dereferences any hard links to get to the
5613 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object * obj)
5615 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5616 /* We want the object id of the equivalent object, not this one */
5617 obj = obj->variant.hardLinkVariant.equivalentObject;
5623 int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
5625 memset(name, 0, buffSize * sizeof(YCHAR));
5627 yaffs_CheckObjectDetailsLoaded(obj);
5629 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
5630 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
5631 } else if (obj->chunkId <= 0) {
5633 /* make up a name */
5634 yaffs_sprintf(locName, _Y("%s%d"), YAFFS_LOSTNFOUND_PREFIX,
5636 yaffs_strncpy(name, locName, buffSize - 1);
5639 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
5640 else if (obj->shortName[0]) {
5641 yaffs_strcpy(name, obj->shortName);
5645 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
5647 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
5649 memset(buffer, 0, obj->myDev->nBytesPerChunk);
5651 if (obj->chunkId >= 0) {
5652 yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
5653 obj->chunkId, buffer,
5656 yaffs_strncpy(name, oh->name, buffSize - 1);
5658 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
5661 return yaffs_strlen(name);
5664 int yaffs_GetObjectFileLength(yaffs_Object * obj)
5667 /* Dereference any hard linking */
5668 obj = yaffs_GetEquivalentObject(obj);
5670 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
5671 return obj->variant.fileVariant.fileSize;
5673 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
5674 return yaffs_strlen(obj->variant.symLinkVariant.alias);
5676 /* Only a directory should drop through to here */
5677 return obj->myDev->nBytesPerChunk;
5681 int yaffs_GetObjectLinkCount(yaffs_Object * obj)
5684 struct list_head *i;
5686 if (!obj->unlinked) {
5687 count++; /* the object itself */
5689 list_for_each(i, &obj->hardLinks) {
5690 count++; /* add the hard links; */
5696 int yaffs_GetObjectInode(yaffs_Object * obj)
5698 obj = yaffs_GetEquivalentObject(obj);
5700 return obj->objectId;
5703 unsigned yaffs_GetObjectType(yaffs_Object * obj)
5705 obj = yaffs_GetEquivalentObject(obj);
5707 switch (obj->variantType) {
5708 case YAFFS_OBJECT_TYPE_FILE:
5711 case YAFFS_OBJECT_TYPE_DIRECTORY:
5714 case YAFFS_OBJECT_TYPE_SYMLINK:
5717 case YAFFS_OBJECT_TYPE_HARDLINK:
5720 case YAFFS_OBJECT_TYPE_SPECIAL:
5721 if (S_ISFIFO(obj->yst_mode))
5723 if (S_ISCHR(obj->yst_mode))
5725 if (S_ISBLK(obj->yst_mode))
5727 if (S_ISSOCK(obj->yst_mode))
5735 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object * obj)
5737 obj = yaffs_GetEquivalentObject(obj);
5738 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
5739 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
5741 return yaffs_CloneString(_Y(""));
5745 #ifndef CONFIG_YAFFS_WINCE
5747 int yaffs_SetAttributes(yaffs_Object * obj, struct iattr *attr)
5749 unsigned int valid = attr->ia_valid;
5751 if (valid & ATTR_MODE)
5752 obj->yst_mode = attr->ia_mode;
5753 if (valid & ATTR_UID)
5754 obj->yst_uid = attr->ia_uid;
5755 if (valid & ATTR_GID)
5756 obj->yst_gid = attr->ia_gid;
5758 if (valid & ATTR_ATIME)
5759 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
5760 if (valid & ATTR_CTIME)
5761 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
5762 if (valid & ATTR_MTIME)
5763 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
5765 if (valid & ATTR_SIZE)
5766 yaffs_ResizeFile(obj, attr->ia_size);
5768 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
5773 int yaffs_GetAttributes(yaffs_Object * obj, struct iattr *attr)
5775 unsigned int valid = 0;
5777 attr->ia_mode = obj->yst_mode;
5779 attr->ia_uid = obj->yst_uid;
5781 attr->ia_gid = obj->yst_gid;
5784 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
5785 valid |= ATTR_ATIME;
5786 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
5787 valid |= ATTR_CTIME;
5788 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
5789 valid |= ATTR_MTIME;
5791 attr->ia_size = yaffs_GetFileSize(obj);
5794 attr->ia_valid = valid;
5803 int yaffs_DumpObject(yaffs_Object * obj)
5807 yaffs_GetObjectName(obj, name, 256);
5809 T(YAFFS_TRACE_ALWAYS,
5811 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
5812 " chunk %d type %d size %d\n"
5813 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
5814 obj->dirty, obj->valid, obj->serial, obj->sum, obj->chunkId,
5815 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
5821 /*---------------------------- Initialisation code -------------------------------------- */
5823 static int yaffs_CheckDevFunctions(const yaffs_Device * dev)
5826 /* Common functions, gotta have */
5827 if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
5830 #ifdef CONFIG_YAFFS_YAFFS2
5832 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
5833 if (dev->writeChunkWithTagsToNAND &&
5834 dev->readChunkWithTagsFromNAND &&
5835 !dev->writeChunkToNAND &&
5836 !dev->readChunkFromNAND &&
5837 dev->markNANDBlockBad && dev->queryNANDBlock)
5841 /* Can use the "spare" style interface for yaffs1 */
5842 if (!dev->isYaffs2 &&
5843 !dev->writeChunkWithTagsToNAND &&
5844 !dev->readChunkWithTagsFromNAND &&
5845 dev->writeChunkToNAND &&
5846 dev->readChunkFromNAND &&
5847 !dev->markNANDBlockBad && !dev->queryNANDBlock)
5854 static void yaffs_CreateInitialDirectories(yaffs_Device *dev)
5856 /* Initialise the unlinked, deleted, root and lost and found directories */
5858 dev->lostNFoundDir = dev->rootDir = NULL;
5859 dev->unlinkedDir = dev->deletedDir = NULL;
5862 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
5864 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
5867 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
5868 YAFFS_ROOT_MODE | S_IFDIR);
5869 dev->lostNFoundDir =
5870 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
5871 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
5872 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
5875 int yaffs_GutsInitialise(yaffs_Device * dev)
5881 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
5883 /* Check stuff that must be set */
5886 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
5890 dev->internalStartBlock = dev->startBlock;
5891 dev->internalEndBlock = dev->endBlock;
5892 dev->blockOffset = 0;
5893 dev->chunkOffset = 0;
5894 dev->nFreeChunks = 0;
5896 if (dev->startBlock == 0) {
5897 dev->internalStartBlock = dev->startBlock + 1;
5898 dev->internalEndBlock = dev->endBlock + 1;
5899 dev->blockOffset = 1;
5900 dev->chunkOffset = dev->nChunksPerBlock;
5903 /* Check geometry parameters. */
5905 if ((dev->isYaffs2 && dev->nBytesPerChunk < 1024) ||
5906 (!dev->isYaffs2 && dev->nBytesPerChunk != 512) ||
5907 dev->nChunksPerBlock < 2 ||
5908 dev->nReservedBlocks < 2 ||
5909 dev->internalStartBlock <= 0 ||
5910 dev->internalEndBlock <= 0 ||
5911 dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2) // otherwise it is too small
5913 T(YAFFS_TRACE_ALWAYS,
5915 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s "
5916 TENDSTR), dev->nBytesPerChunk, dev->isYaffs2 ? "2" : ""));
5920 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
5921 T(YAFFS_TRACE_ALWAYS,
5922 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
5926 /* Got the right mix of functions? */
5927 if (!yaffs_CheckDevFunctions(dev)) {
5928 /* Function missing */
5929 T(YAFFS_TRACE_ALWAYS,
5931 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
5936 /* This is really a compilation check. */
5937 if (!yaffs_CheckStructures()) {
5938 T(YAFFS_TRACE_ALWAYS,
5939 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
5943 if (dev->isMounted) {
5944 T(YAFFS_TRACE_ALWAYS,
5945 (TSTR("yaffs: device already mounted\n" TENDSTR)));
5949 /* Finished with most checks. One or two more checks happen later on too. */
5955 /* OK now calculate a few things for the device
5956 * Calculate chunkGroupBits.
5957 * We need to find the next power of 2 > than internalEndBlock
5960 x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
5962 for (bits = extraBits = 0; x > 1; bits++) {
5971 /* Set up tnode width if wide tnodes are enabled. */
5972 if(!dev->wideTnodesDisabled){
5973 /* bits must be even so that we end up with 32-bit words */
5977 dev->tnodeWidth = 16;
5979 dev->tnodeWidth = bits;
5982 dev->tnodeWidth = 16;
5984 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
5986 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
5987 * so if the bitwidth of the
5988 * chunk range we're using is greater than 16 we need
5989 * to figure out chunk shift and chunkGroupSize
5992 if (bits <= dev->tnodeWidth)
5993 dev->chunkGroupBits = 0;
5995 dev->chunkGroupBits = bits - dev->tnodeWidth;
5998 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
6000 if (dev->nChunksPerBlock < dev->chunkGroupSize) {
6001 /* We have a problem because the soft delete won't work if
6002 * the chunk group size > chunks per block.
6003 * This can be remedied by using larger "virtual blocks".
6005 T(YAFFS_TRACE_ALWAYS,
6006 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
6011 /* OK, we've finished verifying the device, lets continue with initialisation */
6013 /* More device initialisation */
6014 dev->garbageCollections = 0;
6015 dev->passiveGarbageCollections = 0;
6016 dev->currentDirtyChecker = 0;
6017 dev->bufferedBlock = -1;
6018 dev->doingBufferedBlockRewrite = 0;
6019 dev->nDeletedFiles = 0;
6020 dev->nBackgroundDeletions = 0;
6021 dev->nUnlinkedFiles = 0;
6023 dev->eccUnfixed = 0;
6024 dev->tagsEccFixed = 0;
6025 dev->tagsEccUnfixed = 0;
6026 dev->nErasureFailures = 0;
6027 dev->nErasedBlocks = 0;
6030 /* Initialise temporary buffers and caches. */
6033 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
6034 dev->tempBuffer[i].line = 0; /* not in use */
6035 dev->tempBuffer[i].buffer =
6036 YMALLOC(dev->nBytesPerChunk);
6040 if (dev->nShortOpCaches > 0) {
6043 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES) {
6044 dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
6048 YMALLOC(dev->nShortOpCaches * sizeof(yaffs_ChunkCache));
6050 for (i = 0; i < dev->nShortOpCaches; i++) {
6051 dev->srCache[i].object = NULL;
6052 dev->srCache[i].lastUse = 0;
6053 dev->srCache[i].dirty = 0;
6054 dev->srCache[i].data = YMALLOC(dev->nBytesPerChunk);
6061 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
6063 if (dev->isYaffs2) {
6064 dev->useHeaderFileSize = 1;
6067 yaffs_InitialiseBlocks(dev);
6068 yaffs_InitialiseTnodes(dev);
6069 yaffs_InitialiseObjects(dev);
6071 yaffs_CreateInitialDirectories(dev);
6074 /* Now scan the flash. */
6075 if (dev->isYaffs2) {
6076 if(yaffs_CheckpointRestore(dev)) {
6077 T(YAFFS_TRACE_ALWAYS,
6078 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
6081 /* Clean up the mess caused by an aborted checkpoint load
6082 * and scan backwards.
6084 yaffs_DeinitialiseBlocks(dev);
6085 yaffs_DeinitialiseTnodes(dev);
6086 yaffs_DeinitialiseObjects(dev);
6087 yaffs_InitialiseBlocks(dev);
6088 yaffs_InitialiseTnodes(dev);
6089 yaffs_InitialiseObjects(dev);
6090 yaffs_CreateInitialDirectories(dev);
6092 yaffs_ScanBackwards(dev);
6097 /* Zero out stats */
6098 dev->nPageReads = 0;
6099 dev->nPageWrites = 0;
6100 dev->nBlockErasures = 0;
6102 dev->nRetriedWrites = 0;
6104 dev->nRetiredBlocks = 0;
6106 yaffs_VerifyFreeChunks(dev);
6108 T(YAFFS_TRACE_TRACING,
6109 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
6114 void yaffs_Deinitialise(yaffs_Device * dev)
6116 if (dev->isMounted) {
6119 yaffs_DeinitialiseBlocks(dev);
6120 yaffs_DeinitialiseTnodes(dev);
6121 yaffs_DeinitialiseObjects(dev);
6122 if (dev->nShortOpCaches > 0) {
6124 for (i = 0; i < dev->nShortOpCaches; i++) {
6125 YFREE(dev->srCache[i].data);
6128 YFREE(dev->srCache);
6131 YFREE(dev->gcCleanupList);
6133 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
6134 YFREE(dev->tempBuffer[i].buffer);
6142 static int yaffs_CountFreeChunks(yaffs_Device * dev)
6147 yaffs_BlockInfo *blk;
6149 for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
6151 blk = yaffs_GetBlockInfo(dev, b);
6153 switch (blk->blockState) {
6154 case YAFFS_BLOCK_STATE_EMPTY:
6155 case YAFFS_BLOCK_STATE_ALLOCATING:
6156 case YAFFS_BLOCK_STATE_COLLECTING:
6157 case YAFFS_BLOCK_STATE_FULL:
6159 (dev->nChunksPerBlock - blk->pagesInUse +
6160 blk->softDeletions);
6171 int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev)
6173 /* This is what we report to the outside world */
6176 int nDirtyCacheChunks;
6179 nFree = dev->nFreeChunks;
6181 nFree = yaffs_CountFreeChunks(dev);
6184 nFree += dev->nDeletedFiles;
6186 /* Now count the number of dirty chunks in the cache and subtract those */
6190 for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
6191 if (dev->srCache[i].dirty)
6192 nDirtyCacheChunks++;
6196 nFree -= nDirtyCacheChunks;
6198 nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
6207 static int yaffs_freeVerificationFailures;
6209 static void yaffs_VerifyFreeChunks(yaffs_Device * dev)
6211 int counted = yaffs_CountFreeChunks(dev);
6213 int difference = dev->nFreeChunks - counted;
6216 T(YAFFS_TRACE_ALWAYS,
6217 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
6218 dev->nFreeChunks, counted, difference));
6219 yaffs_freeVerificationFailures++;
6223 /*---------------------------------------- YAFFS test code ----------------------*/
6225 #define yaffs_CheckStruct(structure,syze, name) \
6226 if(sizeof(structure) != syze) \
6228 T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),\
6229 name,syze,sizeof(structure))); \
6230 return YAFFS_FAIL; \
6233 static int yaffs_CheckStructures(void)
6235 /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags") */
6236 /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion") */
6237 /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare") */
6238 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
6239 yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode")
6241 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader")