2 * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
4 * Copyright (C) 2002-2010 Aleph One Ltd.
5 * for Toby Churchill Ltd and Brightstar Engineering
7 * Created by Charles Manning <charles@aleph1.co.uk>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include "yaffs_trace.h"
16 #include "yaffsinterface.h"
17 #include "yaffs_guts.h"
18 #include "yaffs_tagsvalidity.h"
19 #include "yaffs_getblockinfo.h"
21 #include "yaffs_tagscompat.h"
23 #include "yaffs_nand.h"
25 #include "yaffs_yaffs1.h"
26 #include "yaffs_yaffs2.h"
27 #include "yaffs_bitmap.h"
28 #include "yaffs_verify.h"
30 #include "yaffs_nand.h"
31 #include "yaffs_packedtags2.h"
33 #include "yaffs_nameval.h"
34 #include "yaffs_allocator.h"
36 /* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
37 #define YAFFS_GC_GOOD_ENOUGH 2
38 #define YAFFS_GC_PASSIVE_THRESHOLD 4
40 #include "yaffs_ecc.h"
44 /* Robustification (if it ever comes about...) */
45 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND);
46 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
48 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
50 const yaffs_ExtendedTags *tags);
51 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
52 const yaffs_ExtendedTags *tags);
54 /* Other local prototypes */
55 static void yaffs_UpdateParent(yaffs_Object *obj);
56 static int yaffs_UnlinkObject(yaffs_Object *obj);
57 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
59 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev,
61 yaffs_ExtendedTags *tags,
65 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
66 yaffs_ObjectType type);
69 static int yaffs_ApplyXMod(yaffs_Object *obj, char *buffer, yaffs_XAttrMod *xmod);
71 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
72 static int yaffs_CheckStructures(void);
73 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
75 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
78 static int yaffs_UnlinkWorker(yaffs_Object *obj);
80 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
83 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
84 yaffs_BlockInfo **blockUsedPtr);
86 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
88 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
89 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
91 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
92 yaffs_ExtendedTags *tags);
94 static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
97 yaffs_ExtendedTags *tags);
100 static void yaffs_LoadNameFromObjectHeader(yaffs_Device *dev,YCHAR *name, const YCHAR *ohName, int bufferSize);
101 static void yaffs_LoadObjectHeaderFromName(yaffs_Device *dev,YCHAR *ohName, const YCHAR *name);
104 /* Function to calculate chunk and offset */
106 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut,
112 chunk = (__u32)(addr >> dev->chunkShift);
114 if (dev->chunkDiv == 1) {
115 /* easy power of 2 case */
116 offset = (__u32)(addr & dev->chunkMask);
118 /* Non power-of-2 case */
122 chunk /= dev->chunkDiv;
124 chunkBase = ((loff_t)chunk) * dev->nDataBytesPerChunk;
125 offset = (__u32)(addr - chunkBase);
132 /* Function to return the number of shifts for a power of 2 greater than or
133 * equal to the given number
134 * Note we don't try to cater for all possible numbers and this does not have to
135 * be hellishly efficient.
138 static __u32 ShiftsGE(__u32 x)
143 nShifts = extraBits = 0;
158 /* Function to return the number of shifts to get a 1 in bit 0
161 static __u32 Shifts(__u32 x)
181 * Temporary buffer manipulations.
184 static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
187 __u8 *buf = (__u8 *)1;
189 memset(dev->tempBuffer, 0, sizeof(dev->tempBuffer));
191 for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
192 dev->tempBuffer[i].line = 0; /* not in use */
193 dev->tempBuffer[i].buffer = buf =
194 YMALLOC_DMA(dev->param.totalBytesPerChunk);
197 return buf ? YAFFS_OK : YAFFS_FAIL;
200 __u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo)
205 if (dev->tempInUse > dev->maxTemp)
206 dev->maxTemp = dev->tempInUse;
208 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
209 if (dev->tempBuffer[i].line == 0) {
210 dev->tempBuffer[i].line = lineNo;
211 if ((i + 1) > dev->maxTemp) {
212 dev->maxTemp = i + 1;
213 for (j = 0; j <= i; j++)
214 dev->tempBuffer[j].maxLine =
215 dev->tempBuffer[j].line;
218 return dev->tempBuffer[i].buffer;
222 T(YAFFS_TRACE_BUFFERS,
223 (TSTR("Out of temp buffers at line %d, other held by lines:"),
225 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
226 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
228 T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
231 * If we got here then we have to allocate an unmanaged one
235 dev->unmanagedTempAllocations++;
236 return YMALLOC(dev->nDataBytesPerChunk);
240 void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer,
247 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
248 if (dev->tempBuffer[i].buffer == buffer) {
249 dev->tempBuffer[i].line = 0;
255 /* assume it is an unmanaged one. */
256 T(YAFFS_TRACE_BUFFERS,
257 (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
260 dev->unmanagedTempDeallocations++;
266 * Determine if we have a managed buffer.
268 int yaffs_IsManagedTempBuffer(yaffs_Device *dev, const __u8 *buffer)
272 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
273 if (dev->tempBuffer[i].buffer == buffer)
277 for (i = 0; i < dev->param.nShortOpCaches; i++) {
278 if (dev->srCache[i].data == buffer)
282 if (buffer == dev->checkpointBuffer)
285 T(YAFFS_TRACE_ALWAYS,
286 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
298 * Simple hash function. Needs to have a reasonable spread
301 static Y_INLINE int yaffs_HashFunction(int n)
304 return n % YAFFS_NOBJECT_BUCKETS;
308 * Access functions to useful fake objects.
309 * Note that root might have a presence in NAND if permissions are set.
312 yaffs_Object *yaffs_Root(yaffs_Device *dev)
317 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
319 return dev->lostNFoundDir;
324 * Erased NAND checking functions
327 int yaffs_CheckFF(__u8 *buffer, int nBytes)
329 /* Horrible, slow implementation */
338 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
341 int retval = YAFFS_OK;
342 __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
343 yaffs_ExtendedTags tags;
346 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
348 if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
351 if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
352 T(YAFFS_TRACE_NANDACCESS,
353 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
357 yaffs_ReleaseTempBuffer(dev, data, __LINE__);
364 static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
367 yaffs_ExtendedTags *tags)
369 int retval = YAFFS_OK;
370 yaffs_ExtendedTags tempTags;
371 __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
374 result = yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,&tempTags);
375 if(memcmp(buffer,data,dev->nDataBytesPerChunk) ||
376 tempTags.objectId != tags->objectId ||
377 tempTags.chunkId != tags->chunkId ||
378 tempTags.byteCount != tags->byteCount)
381 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
386 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
388 yaffs_ExtendedTags *tags,
395 yaffs2_InvalidateCheckpoint(dev);
398 yaffs_BlockInfo *bi = 0;
401 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
407 /* First check this chunk is erased, if it needs
408 * checking. The checking policy (unless forced
409 * always on) is as follows:
411 * Check the first page we try to write in a block.
412 * If the check passes then we don't need to check any
413 * more. If the check fails, we check again...
414 * If the block has been erased, we don't need to check.
416 * However, if the block has been prioritised for gc,
417 * then we think there might be something odd about
418 * this block and stop using it.
420 * Rationale: We should only ever see chunks that have
421 * not been erased if there was a partially written
422 * chunk due to power loss. This checking policy should
423 * catch that case with very few checks and thus save a
424 * lot of checks that are most likely not needed.
427 * If an erase check fails or the write fails we skip the
431 /* let's give it a try */
434 if(dev->param.alwaysCheckErased)
435 bi->skipErasedCheck = 0;
437 if (!bi->skipErasedCheck) {
438 erasedOk = yaffs_CheckChunkErased(dev, chunk);
439 if (erasedOk != YAFFS_OK) {
441 (TSTR("**>> yaffs chunk %d was not erased"
444 /* If not erased, delete this one,
445 * skip rest of block and
446 * try another chunk */
447 yaffs_DeleteChunk(dev,chunk,1,__LINE__);
448 yaffs_SkipRestOfBlock(dev);
453 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
456 if(!bi->skipErasedCheck)
457 writeOk = yaffs_VerifyChunkWritten(dev, chunk, data, tags);
459 if (writeOk != YAFFS_OK) {
460 /* Clean up aborted write, skip to next block and
461 * try another chunk */
462 yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
466 bi->skipErasedCheck = 1;
468 /* Copy the data into the robustification buffer */
469 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
471 } while (writeOk != YAFFS_OK &&
472 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
479 (TSTR("**>> yaffs write required %d attempts" TENDSTR),
482 dev->nRetriedWrites += (attempts - 1);
491 * Block retiring for handling a broken block.
494 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
496 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
498 yaffs2_InvalidateCheckpoint(dev);
500 yaffs2_ClearOldestDirtySequence(dev,bi);
502 if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
503 if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
504 T(YAFFS_TRACE_ALWAYS, (TSTR(
505 "yaffs: Failed to mark bad and erase block %d"
506 TENDSTR), blockInNAND));
508 yaffs_ExtendedTags tags;
509 int chunkId = blockInNAND * dev->param.nChunksPerBlock;
511 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
513 memset(buffer, 0xff, dev->nDataBytesPerChunk);
514 yaffs_InitialiseTags(&tags);
515 tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
516 if (dev->param.writeChunkWithTagsToNAND(dev, chunkId -
517 dev->chunkOffset, buffer, &tags) != YAFFS_OK)
518 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
519 TCONT("write bad block marker to block %d")
520 TENDSTR), blockInNAND));
522 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
526 bi->blockState = YAFFS_BLOCK_STATE_DEAD;
527 bi->gcPrioritise = 0;
528 bi->needsRetiring = 0;
530 dev->nRetiredBlocks++;
534 * Functions for robustisizing TODO
538 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
540 const yaffs_ExtendedTags *tags)
543 chunkInNAND=chunkInNAND;
548 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
549 const yaffs_ExtendedTags *tags)
552 chunkInNAND=chunkInNAND;
556 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
558 if (!bi->gcPrioritise) {
559 bi->gcPrioritise = 1;
560 dev->hasPendingPrioritisedGCs = 1;
561 bi->chunkErrorStrikes++;
563 if (bi->chunkErrorStrikes > 3) {
564 bi->needsRetiring = 1; /* Too many stikes, so retire this */
565 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
571 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
574 int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock;
575 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
577 yaffs_HandleChunkError(dev, bi);
580 /* Was an actual write failure, so mark the block for retirement */
581 bi->needsRetiring = 1;
582 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
583 (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
586 /* Delete the chunk */
587 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
588 yaffs_SkipRestOfBlock(dev);
592 /*---------------- Name handling functions ------------*/
594 static __u16 yaffs_CalcNameSum(const YCHAR *name)
599 const YUCHAR *bname = (const YUCHAR *) name;
601 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
603 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
604 sum += yaffs_toupper(*bname) * i;
615 void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
617 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
618 memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
619 if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH)
620 yaffs_strcpy(obj->shortName, name);
622 obj->shortName[0] = _Y('\0');
624 obj->sum = yaffs_CalcNameSum(name);
627 void yaffs_SetObjectNameFromOH(yaffs_Object *obj, const yaffs_ObjectHeader *oh)
629 #ifdef CONFIG_YAFFS_AUTO_UNICODE
630 YCHAR tmpName[YAFFS_MAX_NAME_LENGTH+1];
631 memset(tmpName,0,sizeof(tmpName));
632 yaffs_LoadNameFromObjectHeader(obj->myDev,tmpName,oh->name,YAFFS_MAX_NAME_LENGTH+1);
633 yaffs_SetObjectName(obj,tmpName);
635 yaffs_SetObjectName(obj,oh->name);
639 /*-------------------- TNODES -------------------
641 * List of spare tnodes
642 * The list is hooked together using the first pointer
647 yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
649 yaffs_Tnode *tn = yaffs_AllocateRawTnode(dev);
651 memset(tn, 0, dev->tnodeSize);
655 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
660 /* FreeTnode frees up a tnode and puts it back on the free list */
661 static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
663 yaffs_FreeRawTnode(dev,tn);
665 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
668 static void yaffs_DeinitialiseTnodesAndObjects(yaffs_Device *dev)
670 yaffs_DeinitialiseRawTnodesAndObjects(dev);
676 void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
679 __u32 *map = (__u32 *)tn;
685 pos &= YAFFS_TNODES_LEVEL0_MASK;
686 val >>= dev->chunkGroupBits;
688 bitInMap = pos * dev->tnodeWidth;
689 wordInMap = bitInMap / 32;
690 bitInWord = bitInMap & (32 - 1);
692 mask = dev->tnodeMask << bitInWord;
694 map[wordInMap] &= ~mask;
695 map[wordInMap] |= (mask & (val << bitInWord));
697 if (dev->tnodeWidth > (32 - bitInWord)) {
698 bitInWord = (32 - bitInWord);
700 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
701 map[wordInMap] &= ~mask;
702 map[wordInMap] |= (mask & (val >> bitInWord));
706 __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
709 __u32 *map = (__u32 *)tn;
715 pos &= YAFFS_TNODES_LEVEL0_MASK;
717 bitInMap = pos * dev->tnodeWidth;
718 wordInMap = bitInMap / 32;
719 bitInWord = bitInMap & (32 - 1);
721 val = map[wordInMap] >> bitInWord;
723 if (dev->tnodeWidth > (32 - bitInWord)) {
724 bitInWord = (32 - bitInWord);
726 val |= (map[wordInMap] << bitInWord);
729 val &= dev->tnodeMask;
730 val <<= dev->chunkGroupBits;
735 /* ------------------- End of individual tnode manipulation -----------------*/
737 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
738 * The look up tree is represented by the top tnode and the number of topLevel
739 * in the tree. 0 means only the level 0 tnode is in the tree.
742 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
743 yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
744 yaffs_FileStructure *fStruct,
747 yaffs_Tnode *tn = fStruct->top;
749 int requiredTallness;
750 int level = fStruct->topLevel;
754 /* Check sane level and chunk Id */
755 if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
758 if (chunkId > YAFFS_MAX_CHUNK_ID)
761 /* First check we're tall enough (ie enough topLevel) */
763 i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
764 requiredTallness = 0;
766 i >>= YAFFS_TNODES_INTERNAL_BITS;
770 if (requiredTallness > fStruct->topLevel)
771 return NULL; /* Not tall enough, so we can't find it */
773 /* Traverse down to level 0 */
774 while (level > 0 && tn) {
775 tn = tn->internal[(chunkId >>
776 (YAFFS_TNODES_LEVEL0_BITS +
778 YAFFS_TNODES_INTERNAL_BITS)) &
779 YAFFS_TNODES_INTERNAL_MASK];
786 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
787 * This happens in two steps:
788 * 1. If the tree isn't tall enough, then make it taller.
789 * 2. Scan down the tree towards the level 0 tnode adding tnodes if required.
791 * Used when modifying the tree.
793 * If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
794 * be plugged into the ttree.
797 yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
798 yaffs_FileStructure *fStruct,
800 yaffs_Tnode *passedTn)
802 int requiredTallness;
810 /* Check sane level and page Id */
811 if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
814 if (chunkId > YAFFS_MAX_CHUNK_ID)
817 /* First check we're tall enough (ie enough topLevel) */
819 x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
820 requiredTallness = 0;
822 x >>= YAFFS_TNODES_INTERNAL_BITS;
827 if (requiredTallness > fStruct->topLevel) {
828 /* Not tall enough, gotta make the tree taller */
829 for (i = fStruct->topLevel; i < requiredTallness; i++) {
831 tn = yaffs_GetTnode(dev);
834 tn->internal[0] = fStruct->top;
839 (TSTR("yaffs: no more tnodes" TENDSTR)));
845 /* Traverse down to level 0, adding anything we need */
847 l = fStruct->topLevel;
851 while (l > 0 && tn) {
853 (YAFFS_TNODES_LEVEL0_BITS +
854 (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
855 YAFFS_TNODES_INTERNAL_MASK;
858 if ((l > 1) && !tn->internal[x]) {
859 /* Add missing non-level-zero tnode */
860 tn->internal[x] = yaffs_GetTnode(dev);
864 /* Looking from level 1 at level 0 */
866 /* If we already have one, then release it.*/
868 yaffs_FreeTnode(dev, tn->internal[x]);
869 tn->internal[x] = passedTn;
871 } else if (!tn->internal[x]) {
872 /* Don't have one, none passed in */
873 tn->internal[x] = yaffs_GetTnode(dev);
879 tn = tn->internal[x];
885 memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
886 yaffs_FreeTnode(dev, passedTn);
893 static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
894 yaffs_ExtendedTags *tags, int objectId,
899 for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
900 if (yaffs_CheckChunkBit(dev, theChunk / dev->param.nChunksPerBlock,
901 theChunk % dev->param.nChunksPerBlock)) {
903 if(dev->chunkGroupSize == 1)
906 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
908 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
920 /* Experimental code not being used yet. Might speed up file deletion */
921 /* DeleteWorker scans backwards through the tnode tree and deletes all the
922 * chunks and tnodes in the file.
923 * Returns 1 if the tree was deleted.
924 * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
927 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
928 int chunkOffset, int *limit)
933 yaffs_ExtendedTags tags;
935 yaffs_Device *dev = in->myDev;
941 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
943 if (tn->internal[i]) {
944 if (limit && (*limit) < 0) {
948 yaffs_DeleteWorker(in,
956 YAFFS_TNODES_INTERNAL_BITS)
964 tn->internal[i] = NULL;
968 return (allDone) ? 1 : 0;
969 } else if (level == 0) {
972 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
974 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
977 chunkInInode = (chunkOffset <<
978 YAFFS_TNODES_LEVEL0_BITS) + i;
981 yaffs_FindChunkInGroup(dev,
987 if (foundChunk > 0) {
988 yaffs_DeleteChunk(dev,
1000 yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1004 return (i < 0) ? 1 : 0;
1016 static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
1018 yaffs_BlockInfo *theBlock;
1021 T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1023 blockNo = chunk / dev->param.nChunksPerBlock;
1024 theBlock = yaffs_GetBlockInfo(dev, blockNo);
1026 theBlock->softDeletions++;
1028 yaffs2_UpdateOldestDirtySequence(dev, blockNo, theBlock);
1032 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1033 * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1035 * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1038 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
1039 __u32 level, int chunkOffset)
1044 yaffs_Device *dev = in->myDev;
1049 for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1051 if (tn->internal[i]) {
1053 yaffs_SoftDeleteWorker(in,
1059 YAFFS_TNODES_INTERNAL_BITS)
1062 yaffs_FreeTnode(dev,
1065 tn->internal[i] = NULL;
1067 /* Hoosterman... how could this happen? */
1071 return (allDone) ? 1 : 0;
1072 } else if (level == 0) {
1074 for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1075 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1077 /* Note this does not find the real chunk, only the chunk group.
1078 * We make an assumption that a chunk group is not larger than
1081 yaffs_SoftDeleteChunk(dev, theChunk);
1082 yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1096 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1099 obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1100 if (obj->nDataChunks <= 0) {
1101 /* Empty file with no duplicate object headers, just delete it immediately */
1102 yaffs_FreeTnode(obj->myDev,
1103 obj->variant.fileVariant.top);
1104 obj->variant.fileVariant.top = NULL;
1105 T(YAFFS_TRACE_TRACING,
1106 (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1108 yaffs_DoGenericObjectDeletion(obj);
1110 yaffs_SoftDeleteWorker(obj,
1111 obj->variant.fileVariant.top,
1112 obj->variant.fileVariant.
1114 obj->softDeleted = 1;
1119 /* Pruning removes any part of the file structure tree that is beyond the
1120 * bounds of the file (ie that does not point to chunks).
1122 * A file should only get pruned when its size is reduced.
1124 * Before pruning, the chunks must be pulled from the tree and the
1125 * level 0 tnode entries must be zeroed out.
1126 * Could also use this for file deletion, but that's probably better handled
1127 * by a special case.
1129 * This function is recursive. For levels > 0 the function is called again on
1130 * any sub-tree. For level == 0 we just check if the sub-tree has data.
1131 * If there is no data in a subtree then it is pruned.
1134 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
1135 __u32 level, int del0)
1144 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1145 if (tn->internal[i]) {
1147 yaffs_PruneWorker(dev, tn->internal[i],
1149 (i == 0) ? del0 : 1);
1152 if (tn->internal[i])
1156 int tnodeSize_u32 = dev->tnodeSize/sizeof(__u32);
1157 __u32 *map = (__u32 *)tn;
1159 for(i = 0; !hasData && i < tnodeSize_u32; i++){
1165 if (hasData == 0 && del0) {
1166 /* Free and return NULL */
1168 yaffs_FreeTnode(dev, tn);
1178 static int yaffs_PruneFileStructure(yaffs_Device *dev,
1179 yaffs_FileStructure *fStruct)
1186 if (fStruct->topLevel > 0) {
1188 yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1190 /* Now we have a tree with all the non-zero branches NULL but the height
1191 * is the same as it was.
1192 * Let's see if we can trim internal tnodes to shorten the tree.
1193 * We can do this if only the 0th element in the tnode is in use
1194 * (ie all the non-zero are NULL)
1197 while (fStruct->topLevel && !done) {
1201 for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1202 if (tn->internal[i])
1207 fStruct->top = tn->internal[0];
1208 fStruct->topLevel--;
1209 yaffs_FreeTnode(dev, tn);
1219 /*-------------------- End of File Structure functions.-------------------*/
1222 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1223 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
1225 yaffs_Object *obj = yaffs_AllocateRawObject(dev);
1230 /* Now sweeten it up... */
1232 memset(obj, 0, sizeof(yaffs_Object));
1233 obj->beingCreated = 1;
1237 obj->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1238 YINIT_LIST_HEAD(&(obj->hardLinks));
1239 YINIT_LIST_HEAD(&(obj->hashLink));
1240 YINIT_LIST_HEAD(&obj->siblings);
1243 /* Now make the directory sane */
1245 obj->parent = dev->rootDir;
1246 ylist_add(&(obj->siblings), &dev->rootDir->variant.directoryVariant.children);
1249 /* Add it to the lost and found directory.
1250 * NB Can't put root or lostNFound in lostNFound so
1251 * check if lostNFound exists first
1253 if (dev->lostNFoundDir)
1254 yaffs_AddObjectToDirectory(dev->lostNFoundDir, obj);
1256 obj->beingCreated = 0;
1259 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1264 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
1269 yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1271 obj->fake = 1; /* it is fake so it might have no NAND presence... */
1272 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1273 obj->unlinkAllowed = 0; /* ... or unlink it */
1276 obj->yst_mode = mode;
1278 obj->hdrChunk = 0; /* Not a valid chunk. */
1285 static void yaffs_UnhashObject(yaffs_Object *obj)
1288 yaffs_Device *dev = obj->myDev;
1290 /* If it is still linked into the bucket list, free from the list */
1291 if (!ylist_empty(&obj->hashLink)) {
1292 ylist_del_init(&obj->hashLink);
1293 bucket = yaffs_HashFunction(obj->objectId);
1294 dev->objectBucket[bucket].count--;
1298 /* FreeObject frees up a Object and puts it back on the free list */
1299 static void yaffs_FreeObject(yaffs_Object *obj)
1301 yaffs_Device *dev = obj->myDev;
1303 T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), obj, obj->myInode));
1309 if (!ylist_empty(&obj->siblings))
1314 /* We're still hooked up to a cached inode.
1315 * Don't delete now, but mark for later deletion
1317 obj->deferedFree = 1;
1321 yaffs_UnhashObject(obj);
1323 yaffs_FreeRawObject(dev,obj);
1325 dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1329 void yaffs_HandleDeferedFree(yaffs_Object *obj)
1331 if (obj->deferedFree)
1332 yaffs_FreeObject(obj);
1335 static void yaffs_InitialiseTnodesAndObjects(yaffs_Device *dev)
1342 yaffs_InitialiseRawTnodesAndObjects(dev);
1344 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
1345 YINIT_LIST_HEAD(&dev->objectBucket[i].list);
1346 dev->objectBucket[i].count = 0;
1350 static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
1354 int lowest = 999999;
1357 /* Search for the shortest list or one that
1361 for (i = 0; i < 10 && lowest > 4; i++) {
1362 dev->bucketFinder++;
1363 dev->bucketFinder %= YAFFS_NOBJECT_BUCKETS;
1364 if (dev->objectBucket[dev->bucketFinder].count < lowest) {
1365 lowest = dev->objectBucket[dev->bucketFinder].count;
1366 l = dev->bucketFinder;
1374 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
1376 int bucket = yaffs_FindNiceObjectBucket(dev);
1378 /* Now find an object value that has not already been taken
1379 * by scanning the list.
1383 struct ylist_head *i;
1385 __u32 n = (__u32) bucket;
1387 /* yaffs_CheckObjectHashSanity(); */
1391 n += YAFFS_NOBJECT_BUCKETS;
1392 if (1 || dev->objectBucket[bucket].count > 0) {
1393 ylist_for_each(i, &dev->objectBucket[bucket].list) {
1394 /* If there is already one in the list */
1395 if (i && ylist_entry(i, yaffs_Object,
1396 hashLink)->objectId == n) {
1406 static void yaffs_HashObject(yaffs_Object *in)
1408 int bucket = yaffs_HashFunction(in->objectId);
1409 yaffs_Device *dev = in->myDev;
1411 ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
1412 dev->objectBucket[bucket].count++;
1415 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
1417 int bucket = yaffs_HashFunction(number);
1418 struct ylist_head *i;
1421 ylist_for_each(i, &dev->objectBucket[bucket].list) {
1422 /* Look if it is in the list */
1424 in = ylist_entry(i, yaffs_Object, hashLink);
1425 if (in->objectId == number) {
1427 /* Don't tell the VFS about this one if it is defered free */
1428 if (in->deferedFree)
1439 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
1440 yaffs_ObjectType type)
1442 yaffs_Object *theObject=NULL;
1443 yaffs_Tnode *tn = NULL;
1446 number = yaffs_CreateNewObjectNumber(dev);
1448 if (type == YAFFS_OBJECT_TYPE_FILE) {
1449 tn = yaffs_GetTnode(dev);
1454 theObject = yaffs_AllocateEmptyObject(dev);
1457 yaffs_FreeTnode(dev,tn);
1463 theObject->fake = 0;
1464 theObject->renameAllowed = 1;
1465 theObject->unlinkAllowed = 1;
1466 theObject->objectId = number;
1467 yaffs_HashObject(theObject);
1468 theObject->variantType = type;
1469 #ifdef CONFIG_YAFFS_WINCE
1470 yfsd_WinFileTimeNow(theObject->win_atime);
1471 theObject->win_ctime[0] = theObject->win_mtime[0] =
1472 theObject->win_atime[0];
1473 theObject->win_ctime[1] = theObject->win_mtime[1] =
1474 theObject->win_atime[1];
1478 theObject->yst_atime = theObject->yst_mtime =
1479 theObject->yst_ctime = Y_CURRENT_TIME;
1482 case YAFFS_OBJECT_TYPE_FILE:
1483 theObject->variant.fileVariant.fileSize = 0;
1484 theObject->variant.fileVariant.scannedFileSize = 0;
1485 theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
1486 theObject->variant.fileVariant.topLevel = 0;
1487 theObject->variant.fileVariant.top = tn;
1489 case YAFFS_OBJECT_TYPE_DIRECTORY:
1490 YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
1492 YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
1495 case YAFFS_OBJECT_TYPE_SYMLINK:
1496 case YAFFS_OBJECT_TYPE_HARDLINK:
1497 case YAFFS_OBJECT_TYPE_SPECIAL:
1498 /* No action required */
1500 case YAFFS_OBJECT_TYPE_UNKNOWN:
1501 /* todo this should not happen */
1509 yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
1511 yaffs_ObjectType type)
1513 yaffs_Object *theObject = NULL;
1516 theObject = yaffs_FindObjectByNumber(dev, number);
1519 theObject = yaffs_CreateNewObject(dev, number, type);
1526 YCHAR *yaffs_CloneString(const YCHAR *str)
1528 YCHAR *newStr = NULL;
1534 len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH);
1535 newStr = YMALLOC((len + 1) * sizeof(YCHAR));
1537 yaffs_strncpy(newStr, str,len);
1545 * Mknod (create) a new object.
1546 * equivalentObject only has meaning for a hard link;
1547 * aliasString only has meaning for a symlink.
1548 * rdev only has meaning for devices (a subset of special objects)
1551 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
1552 yaffs_Object *parent,
1557 yaffs_Object *equivalentObject,
1558 const YCHAR *aliasString, __u32 rdev)
1563 yaffs_Device *dev = parent->myDev;
1565 /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
1566 if (yaffs_FindObjectByName(parent, name))
1569 if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
1570 str = yaffs_CloneString(aliasString);
1575 in = yaffs_CreateNewObject(dev, -1, type);
1590 in->variantType = type;
1592 in->yst_mode = mode;
1594 #ifdef CONFIG_YAFFS_WINCE
1595 yfsd_WinFileTimeNow(in->win_atime);
1596 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
1597 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
1600 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
1602 in->yst_rdev = rdev;
1606 in->nDataChunks = 0;
1608 yaffs_SetObjectName(in, name);
1611 yaffs_AddObjectToDirectory(parent, in);
1613 in->myDev = parent->myDev;
1616 case YAFFS_OBJECT_TYPE_SYMLINK:
1617 in->variant.symLinkVariant.alias = str;
1619 case YAFFS_OBJECT_TYPE_HARDLINK:
1620 in->variant.hardLinkVariant.equivalentObject =
1622 in->variant.hardLinkVariant.equivalentObjectId =
1623 equivalentObject->objectId;
1624 ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
1626 case YAFFS_OBJECT_TYPE_FILE:
1627 case YAFFS_OBJECT_TYPE_DIRECTORY:
1628 case YAFFS_OBJECT_TYPE_SPECIAL:
1629 case YAFFS_OBJECT_TYPE_UNKNOWN:
1634 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0, NULL) < 0) {
1635 /* Could not create the object header, fail the creation */
1636 yaffs_DeleteObject(in);
1640 yaffs_UpdateParent(parent);
1646 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
1647 __u32 mode, __u32 uid, __u32 gid)
1649 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
1650 uid, gid, NULL, NULL, 0);
1653 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
1654 __u32 mode, __u32 uid, __u32 gid)
1656 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
1657 mode, uid, gid, NULL, NULL, 0);
1660 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
1661 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
1663 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
1664 uid, gid, NULL, NULL, rdev);
1667 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
1668 __u32 mode, __u32 uid, __u32 gid,
1671 return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
1672 uid, gid, NULL, alias, 0);
1675 /* yaffs_Link returns the object id of the equivalent object.*/
1676 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
1677 yaffs_Object *equivalentObject)
1679 /* Get the real object in case we were fed a hard link as an equivalent object */
1680 equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
1682 if (yaffs_MknodObject
1683 (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
1684 equivalentObject, NULL, 0)) {
1685 return equivalentObject;
1692 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
1693 const YCHAR *newName, int force, int shadows)
1698 yaffs_Object *existingTarget;
1701 newDir = obj->parent; /* use the old directory */
1703 if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
1704 T(YAFFS_TRACE_ALWAYS,
1706 ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
1711 /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
1712 if (obj->myDev->param.isYaffs2)
1713 unlinkOp = (newDir == obj->myDev->unlinkedDir);
1715 unlinkOp = (newDir == obj->myDev->unlinkedDir
1716 && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
1718 deleteOp = (newDir == obj->myDev->deletedDir);
1720 existingTarget = yaffs_FindObjectByName(newDir, newName);
1722 /* If the object is a file going into the unlinked directory,
1723 * then it is OK to just stuff it in since duplicate names are allowed.
1724 * else only proceed if the new name does not exist and if we're putting
1725 * it into a directory.
1732 newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
1733 yaffs_SetObjectName(obj, newName);
1736 yaffs_AddObjectToDirectory(newDir, obj);
1741 /* If it is a deletion then we mark it as a shrink for gc purposes. */
1742 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows, NULL) >= 0)
1749 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
1750 yaffs_Object *newDir, const YCHAR *newName)
1752 yaffs_Object *obj = NULL;
1753 yaffs_Object *existingTarget = NULL;
1759 if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
1761 if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
1764 dev = oldDir->myDev;
1766 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1767 /* Special case for case insemsitive systems (eg. WinCE).
1768 * While look-up is case insensitive, the name isn't.
1769 * Therefore we might want to change x.txt to X.txt
1771 if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
1775 if(yaffs_strnlen(newName,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH)
1779 obj = yaffs_FindObjectByName(oldDir, oldName);
1781 if (obj && obj->renameAllowed) {
1783 /* Now do the handling for an existing target, if there is one */
1785 existingTarget = yaffs_FindObjectByName(newDir, newName);
1786 if (existingTarget &&
1787 existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
1788 !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
1789 /* There is a target that is a non-empty directory, so we fail */
1790 return YAFFS_FAIL; /* EEXIST or ENOTEMPTY */
1791 } else if (existingTarget && existingTarget != obj) {
1792 /* Nuke the target first, using shadowing,
1793 * but only if it isn't the same object.
1795 * Note we must disable gc otherwise it can mess up the shadowing.
1799 yaffs_ChangeObjectName(obj, newDir, newName, force,
1800 existingTarget->objectId);
1801 existingTarget->isShadowed = 1;
1802 yaffs_UnlinkObject(existingTarget);
1806 result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
1808 yaffs_UpdateParent(oldDir);
1809 if(newDir != oldDir)
1810 yaffs_UpdateParent(newDir);
1817 /*------------------------- Block Management and Page Allocation ----------------*/
1819 static int yaffs_InitialiseBlocks(yaffs_Device *dev)
1821 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
1823 dev->blockInfo = NULL;
1824 dev->chunkBits = NULL;
1826 dev->allocationBlock = -1; /* force it to get a new one */
1828 /* If the first allocation strategy fails, thry the alternate one */
1829 dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
1830 if (!dev->blockInfo) {
1831 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
1832 dev->blockInfoAlt = 1;
1834 dev->blockInfoAlt = 0;
1836 if (dev->blockInfo) {
1837 /* Set up dynamic blockinfo stuff. */
1838 dev->chunkBitmapStride = (dev->param.nChunksPerBlock + 7) / 8; /* round up bytes */
1839 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
1840 if (!dev->chunkBits) {
1841 dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
1842 dev->chunkBitsAlt = 1;
1844 dev->chunkBitsAlt = 0;
1847 if (dev->blockInfo && dev->chunkBits) {
1848 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
1849 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
1856 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
1858 if (dev->blockInfoAlt && dev->blockInfo)
1859 YFREE_ALT(dev->blockInfo);
1860 else if (dev->blockInfo)
1861 YFREE(dev->blockInfo);
1863 dev->blockInfoAlt = 0;
1865 dev->blockInfo = NULL;
1867 if (dev->chunkBitsAlt && dev->chunkBits)
1868 YFREE_ALT(dev->chunkBits);
1869 else if (dev->chunkBits)
1870 YFREE(dev->chunkBits);
1871 dev->chunkBitsAlt = 0;
1872 dev->chunkBits = NULL;
1875 void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
1877 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
1881 /* If the block is still healthy erase it and mark as clean.
1882 * If the block has had a data failure, then retire it.
1885 T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
1886 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
1887 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
1889 yaffs2_ClearOldestDirtySequence(dev,bi);
1891 bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
1893 /* If this is the block being garbage collected then stop gc'ing this block */
1894 if(blockNo == dev->gcBlock)
1897 /* If this block is currently the best candidate for gc then drop as a candidate */
1898 if(blockNo == dev->gcDirtiest){
1899 dev->gcDirtiest = 0;
1900 dev->gcPagesInUse = 0;
1903 if (!bi->needsRetiring) {
1904 yaffs2_InvalidateCheckpoint(dev);
1905 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
1907 dev->nErasureFailures++;
1908 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1909 (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
1914 ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
1916 for (i = 0; i < dev->param.nChunksPerBlock; i++) {
1917 if (!yaffs_CheckChunkErased
1918 (dev, blockNo * dev->param.nChunksPerBlock + i)) {
1919 T(YAFFS_TRACE_ERROR,
1921 (">>Block %d erasure supposedly OK, but chunk %d not erased"
1922 TENDSTR), blockNo, i));
1928 /* Clean it up... */
1929 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
1930 bi->sequenceNumber = 0;
1931 dev->nErasedBlocks++;
1933 bi->softDeletions = 0;
1934 bi->hasShrinkHeader = 0;
1935 bi->skipErasedCheck = 1; /* This is clean, so no need to check */
1936 bi->gcPrioritise = 0;
1937 yaffs_ClearChunkBits(dev, blockNo);
1939 T(YAFFS_TRACE_ERASE,
1940 (TSTR("Erased block %d" TENDSTR), blockNo));
1942 dev->nFreeChunks -= dev->param.nChunksPerBlock; /* We lost a block of free space */
1944 yaffs_RetireBlock(dev, blockNo);
1945 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1946 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
1950 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
1954 yaffs_BlockInfo *bi;
1956 if (dev->nErasedBlocks < 1) {
1957 /* Hoosterman we've got a problem.
1958 * Can't get space to gc
1960 T(YAFFS_TRACE_ERROR,
1961 (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
1966 /* Find an empty block. */
1968 for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
1969 dev->allocationBlockFinder++;
1970 if (dev->allocationBlockFinder < dev->internalStartBlock
1971 || dev->allocationBlockFinder > dev->internalEndBlock) {
1972 dev->allocationBlockFinder = dev->internalStartBlock;
1975 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
1977 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
1978 bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
1979 dev->sequenceNumber++;
1980 bi->sequenceNumber = dev->sequenceNumber;
1981 dev->nErasedBlocks--;
1982 T(YAFFS_TRACE_ALLOCATE,
1983 (TSTR("Allocated block %d, seq %d, %d left" TENDSTR),
1984 dev->allocationBlockFinder, dev->sequenceNumber,
1985 dev->nErasedBlocks));
1986 return dev->allocationBlockFinder;
1990 T(YAFFS_TRACE_ALWAYS,
1992 ("yaffs tragedy: no more erased blocks, but there should have been %d"
1993 TENDSTR), dev->nErasedBlocks));
2000 * Check if there's space to allocate...
2001 * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2003 int yaffs_CheckSpaceForAllocation(yaffs_Device *dev, int nChunks)
2006 int reservedBlocks = dev->param.nReservedBlocks;
2007 int checkpointBlocks;
2009 checkpointBlocks = yaffs2_CalcCheckpointBlocksRequired(dev);
2011 reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.nChunksPerBlock);
2013 return (dev->nFreeChunks > (reservedChunks + nChunks));
2016 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
2017 yaffs_BlockInfo **blockUsedPtr)
2020 yaffs_BlockInfo *bi;
2022 if (dev->allocationBlock < 0) {
2023 /* Get next block to allocate off */
2024 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2025 dev->allocationPage = 0;
2028 if (!useReserve && !yaffs_CheckSpaceForAllocation(dev, 1)) {
2029 /* Not enough space to allocate unless we're allowed to use the reserve. */
2033 if (dev->nErasedBlocks < dev->param.nReservedBlocks
2034 && dev->allocationPage == 0) {
2035 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2038 /* Next page please.... */
2039 if (dev->allocationBlock >= 0) {
2040 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2042 retVal = (dev->allocationBlock * dev->param.nChunksPerBlock) +
2043 dev->allocationPage;
2045 yaffs_SetChunkBit(dev, dev->allocationBlock,
2046 dev->allocationPage);
2048 dev->allocationPage++;
2052 /* If the block is full set the state to full */
2053 if (dev->allocationPage >= dev->param.nChunksPerBlock) {
2054 bi->blockState = YAFFS_BLOCK_STATE_FULL;
2055 dev->allocationBlock = -1;
2064 T(YAFFS_TRACE_ERROR,
2065 (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2070 static int yaffs_GetErasedChunks(yaffs_Device *dev)
2074 n = dev->nErasedBlocks * dev->param.nChunksPerBlock;
2076 if (dev->allocationBlock > 0)
2077 n += (dev->param.nChunksPerBlock - dev->allocationPage);
2084 * yaffs_SkipRestOfBlock() skips over the rest of the allocation block
2085 * if we don't want to write to it.
2087 void yaffs_SkipRestOfBlock(yaffs_Device *dev)
2089 if(dev->allocationBlock > 0){
2090 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2091 if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){
2092 bi->blockState = YAFFS_BLOCK_STATE_FULL;
2093 dev->allocationBlock = -1;
2099 static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
2105 int retVal = YAFFS_OK;
2107 int isCheckpointBlock;
2111 int chunksBefore = yaffs_GetErasedChunks(dev);
2114 yaffs_ExtendedTags tags;
2116 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2118 yaffs_Object *object;
2120 isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
2123 T(YAFFS_TRACE_TRACING,
2124 (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
2127 bi->hasShrinkHeader,
2130 /*yaffs_VerifyFreeChunks(dev); */
2132 if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
2133 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2135 bi->hasShrinkHeader = 0; /* clear the flag so that the block can erase */
2139 if (isCheckpointBlock ||
2140 !yaffs_StillSomeChunkBits(dev, block)) {
2141 T(YAFFS_TRACE_TRACING,
2143 ("Collecting block %d that has no chunks in use" TENDSTR),
2145 yaffs_BlockBecameDirty(dev, block);
2148 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
2150 yaffs_VerifyBlock(dev, bi, block);
2152 maxCopies = (wholeBlock) ? dev->param.nChunksPerBlock : 5;
2153 oldChunk = block * dev->param.nChunksPerBlock + dev->gcChunk;
2155 for (/* init already done */;
2156 retVal == YAFFS_OK &&
2157 dev->gcChunk < dev->param.nChunksPerBlock &&
2158 (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
2160 dev->gcChunk++, oldChunk++) {
2161 if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
2163 /* This page is in use and might need to be copied off */
2169 yaffs_InitialiseTags(&tags);
2171 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
2175 yaffs_FindObjectByNumber(dev,
2178 T(YAFFS_TRACE_GC_DETAIL,
2180 ("Collecting chunk in block %d, %d %d %d " TENDSTR),
2181 dev->gcChunk, tags.objectId, tags.chunkId,
2184 if (object && !yaffs_SkipVerification(dev)) {
2185 if (tags.chunkId == 0)
2186 matchingChunk = object->hdrChunk;
2187 else if (object->softDeleted)
2188 matchingChunk = oldChunk; /* Defeat the test */
2190 matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
2192 if (oldChunk != matchingChunk)
2193 T(YAFFS_TRACE_ERROR,
2194 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
2195 oldChunk, matchingChunk, tags.objectId, tags.chunkId));
2200 T(YAFFS_TRACE_ERROR,
2202 ("page %d in gc has no object: %d %d %d "
2204 tags.objectId, tags.chunkId, tags.byteCount));
2209 object->softDeleted &&
2210 tags.chunkId != 0) {
2211 /* Data chunk in a soft deleted file, throw it away
2212 * It's a soft deleted data chunk,
2213 * No need to copy this, just forget about it and
2214 * fix up the object.
2217 /* Free chunks already includes softdeleted chunks.
2218 * How ever this chunk is going to soon be really deleted
2219 * which will increment free chunks.
2220 * We have to decrement free chunks so this works out properly.
2223 bi->softDeletions--;
2225 object->nDataChunks--;
2227 if (object->nDataChunks <= 0) {
2228 /* remeber to clean up the object */
2229 dev->gcCleanupList[dev->nCleanups] =
2235 /* Todo object && object->deleted && object->nDataChunks == 0 */
2236 /* Deleted object header with no data chunks.
2237 * Can be discarded and the file deleted.
2239 object->hdrChunk = 0;
2240 yaffs_FreeTnode(object->myDev,
2243 object->variant.fileVariant.top = NULL;
2244 yaffs_DoGenericObjectDeletion(object);
2246 } else if (object) {
2247 /* It's either a data chunk in a live file or
2248 * an ObjectHeader, so we're interested in it.
2249 * NB Need to keep the ObjectHeaders of deleted files
2250 * until the whole file has been deleted off
2252 tags.serialNumber++;
2256 if (tags.chunkId == 0) {
2257 /* It is an object Id,
2258 * We need to nuke the shrinkheader flags first
2259 * Also need to clean up shadowing.
2260 * We no longer want the shrinkHeader flag since its work is done
2261 * and if it is left in place it will mess up scanning.
2264 yaffs_ObjectHeader *oh;
2265 oh = (yaffs_ObjectHeader *)buffer;
2268 tags.extraIsShrinkHeader = 0;
2270 oh->shadowsObject = 0;
2271 oh->inbandShadowsObject = 0;
2272 tags.extraShadows = 0;
2274 /* Update file size */
2275 if(object->variantType == YAFFS_OBJECT_TYPE_FILE){
2276 oh->fileSize = object->variant.fileVariant.fileSize;
2277 tags.extraFileLength = oh->fileSize;
2280 yaffs_VerifyObjectHeader(object, oh, &tags, 1);
2282 yaffs_WriteNewChunkWithTagsToNAND(dev,(__u8 *) oh, &tags, 1);
2285 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
2288 retVal = YAFFS_FAIL;
2291 /* Ok, now fix up the Tnodes etc. */
2293 if (tags.chunkId == 0) {
2295 object->hdrChunk = newChunk;
2296 object->serial = tags.serialNumber;
2298 /* It's a data chunk */
2300 ok = yaffs_PutChunkIntoFile
2308 if (retVal == YAFFS_OK)
2309 yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
2314 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
2320 yaffs_VerifyCollectedBlock(dev, bi, block);
2324 if (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
2326 * The gc did not complete. Set block state back to FULL
2327 * because checkpointing does not restore gc.
2329 bi->blockState = YAFFS_BLOCK_STATE_FULL;
2331 /* The gc completed. */
2332 /* Do any required cleanups */
2333 for (i = 0; i < dev->nCleanups; i++) {
2334 /* Time to delete the file too */
2336 yaffs_FindObjectByNumber(dev,
2337 dev->gcCleanupList[i]);
2339 yaffs_FreeTnode(dev,
2340 object->variant.fileVariant.
2342 object->variant.fileVariant.top = NULL;
2345 ("yaffs: About to finally delete object %d"
2346 TENDSTR), object->objectId));
2347 yaffs_DoGenericObjectDeletion(object);
2348 object->myDev->nDeletedFiles--;
2354 chunksAfter = yaffs_GetErasedChunks(dev);
2355 if (chunksBefore >= chunksAfter) {
2358 ("gc did not increase free chunks before %d after %d"
2359 TENDSTR), chunksBefore, chunksAfter));
2372 * FindBlockForgarbageCollection is used to select the dirtiest block (or close enough)
2373 * for garbage collection.
2376 static unsigned yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
2382 unsigned selected = 0;
2383 int prioritised = 0;
2384 int prioritisedExists = 0;
2385 yaffs_BlockInfo *bi;
2388 /* First let's see if we need to grab a prioritised block */
2389 if (dev->hasPendingPrioritisedGCs && !aggressive) {
2390 dev->gcDirtiest = 0;
2391 bi = dev->blockInfo;
2392 for (i = dev->internalStartBlock;
2393 i <= dev->internalEndBlock && !selected;
2396 if (bi->gcPrioritise) {
2397 prioritisedExists = 1;
2398 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2399 yaffs2_BlockNotDisqualifiedFromGC(dev, bi)) {
2408 * If there is a prioritised block and none was selected then
2409 * this happened because there is at least one old dirty block gumming
2410 * up the works. Let's gc the oldest dirty block.
2413 if(prioritisedExists &&
2415 dev->oldestDirtyBlock > 0)
2416 selected = dev->oldestDirtyBlock;
2418 if (!prioritisedExists) /* None found, so we can clear this */
2419 dev->hasPendingPrioritisedGCs = 0;
2422 /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2424 * else (we're doing a leasurely gc), then we only bother to do this if the
2425 * block has only a few pages in use.
2430 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2432 threshold = dev->param.nChunksPerBlock;
2433 iterations = nBlocks;
2438 maxThreshold = dev->param.nChunksPerBlock/2;
2440 maxThreshold = dev->param.nChunksPerBlock/8;
2442 if(maxThreshold < YAFFS_GC_PASSIVE_THRESHOLD)
2443 maxThreshold = YAFFS_GC_PASSIVE_THRESHOLD;
2445 threshold = background ?
2446 (dev->gcNotDone + 2) * 2 : 0;
2447 if(threshold <YAFFS_GC_PASSIVE_THRESHOLD)
2448 threshold = YAFFS_GC_PASSIVE_THRESHOLD;
2449 if(threshold > maxThreshold)
2450 threshold = maxThreshold;
2452 iterations = nBlocks / 16 + 1;
2453 if (iterations > 100)
2459 (dev->gcDirtiest < 1 ||
2460 dev->gcPagesInUse > YAFFS_GC_GOOD_ENOUGH);
2462 dev->gcBlockFinder++;
2463 if (dev->gcBlockFinder < dev->internalStartBlock ||
2464 dev->gcBlockFinder > dev->internalEndBlock)
2465 dev->gcBlockFinder = dev->internalStartBlock;
2467 bi = yaffs_GetBlockInfo(dev, dev->gcBlockFinder);
2469 pagesUsed = bi->pagesInUse - bi->softDeletions;
2471 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2472 pagesUsed < dev->param.nChunksPerBlock &&
2473 (dev->gcDirtiest < 1 || pagesUsed < dev->gcPagesInUse) &&
2474 yaffs2_BlockNotDisqualifiedFromGC(dev, bi)) {
2475 dev->gcDirtiest = dev->gcBlockFinder;
2476 dev->gcPagesInUse = pagesUsed;
2480 if(dev->gcDirtiest > 0 && dev->gcPagesInUse <= threshold)
2481 selected = dev->gcDirtiest;
2485 * If nothing has been selected for a while, try selecting the oldest dirty
2486 * because that's gumming up the works.
2489 if(!selected && dev->param.isYaffs2 &&
2490 dev->gcNotDone >= ( background ? 10 : 20)){
2491 yaffs2_FindOldestDirtySequence(dev);
2492 if(dev->oldestDirtyBlock > 0) {
2493 selected = dev->oldestDirtyBlock;
2494 dev->gcDirtiest = selected;
2495 dev->oldestDirtyGCs++;
2496 bi = yaffs_GetBlockInfo(dev, selected);
2497 dev->gcPagesInUse = bi->pagesInUse - bi->softDeletions;
2504 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR),
2506 dev->param.nChunksPerBlock - dev->gcPagesInUse,
2511 dev->backgroundGCs++;
2513 dev->gcDirtiest = 0;
2514 dev->gcPagesInUse = 0;
2516 if(dev->refreshSkip > 0)
2521 (TSTR("GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s" TENDSTR),
2522 dev->gcBlockFinder, dev->gcNotDone,
2524 dev->gcDirtiest, dev->gcPagesInUse,
2525 dev->oldestDirtyBlock,
2526 background ? " bg" : ""));
2532 /* New garbage collector
2533 * If we're very low on erased blocks then we do aggressive garbage collection
2534 * otherwise we do "leasurely" garbage collection.
2535 * Aggressive gc looks further (whole array) and will accept less dirty blocks.
2536 * Passive gc only inspects smaller areas and will only accept more dirty blocks.
2538 * The idea is to help clear out space in a more spread-out manner.
2539 * Dunno if it really does anything useful.
2541 static int yaffs_CheckGarbageCollection(yaffs_Device *dev, int background)
2544 int gcOk = YAFFS_OK;
2548 int checkpointBlockAdjust;
2550 if(dev->param.gcControl &&
2551 (dev->param.gcControl(dev) & 1) == 0)
2554 if (dev->gcDisable) {
2555 /* Bail out so we don't get recursive gc */
2559 /* This loop should pass the first time.
2560 * We'll only see looping here if the collection does not increase space.
2566 checkpointBlockAdjust = yaffs2_CalcCheckpointBlocksRequired(dev);
2568 minErased = dev->param.nReservedBlocks + checkpointBlockAdjust + 1;
2569 erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
2571 /* If we need a block soon then do aggressive gc.*/
2572 if (dev->nErasedBlocks < minErased)
2575 if(!background && erasedChunks > (dev->nFreeChunks / 4))
2578 if(dev->gcSkip > 20)
2580 if(erasedChunks < dev->nFreeChunks/2 ||
2592 /* If we don't already have a block being gc'd then see if we should start another */
2594 if (dev->gcBlock < 1 && !aggressive) {
2595 dev->gcBlock = yaffs2_FindRefreshBlock(dev);
2599 if (dev->gcBlock < 1) {
2600 dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive, background);
2605 if (dev->gcBlock > 0) {
2612 ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
2613 dev->nErasedBlocks, aggressive));
2615 gcOk = yaffs_GarbageCollectBlock(dev, dev->gcBlock, aggressive);
2618 if (dev->nErasedBlocks < (dev->param.nReservedBlocks) && dev->gcBlock > 0) {
2621 ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
2622 TENDSTR), dev->nErasedBlocks, maxTries, dev->gcBlock));
2624 } while ((dev->nErasedBlocks < dev->param.nReservedBlocks) &&
2625 (dev->gcBlock > 0) &&
2628 return aggressive ? gcOk : YAFFS_OK;
2632 * yaffs_BackgroundGarbageCollect()
2633 * Garbage collects. Intended to be called from a background thread.
2634 * Returns non-zero if at least half the free chunks are erased.
2636 int yaffs_BackgroundGarbageCollect(yaffs_Device *dev, unsigned urgency)
2638 int erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
2640 T(YAFFS_TRACE_BACKGROUND, (TSTR("Background gc %u" TENDSTR),urgency));
2642 yaffs_CheckGarbageCollection(dev, 1);
2643 return erasedChunks > dev->nFreeChunks/2;
2646 /*------------------------- TAGS --------------------------------*/
2648 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
2651 return (tags->chunkId == chunkInObject &&
2652 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
2657 /*-------------------- Data file manipulation -----------------*/
2659 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
2660 yaffs_ExtendedTags *tags)
2662 /*Get the Tnode, then get the level 0 offset chunk offset */
2665 yaffs_ExtendedTags localTags;
2668 yaffs_Device *dev = in->myDev;
2671 /* Passed a NULL, so use our own tags space */
2675 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
2678 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
2681 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
2687 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
2688 yaffs_ExtendedTags *tags)
2690 /* Get the Tnode, then get the level 0 offset chunk offset */
2693 yaffs_ExtendedTags localTags;
2695 yaffs_Device *dev = in->myDev;
2699 /* Passed a NULL, so use our own tags space */
2703 tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
2707 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
2710 yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
2713 /* Delete the entry in the filestructure (if found) */
2715 yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0);
2722 int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
2723 int chunkInNAND, int inScan)
2725 /* NB inScan is zero unless scanning.
2726 * For forward scanning, inScan is > 0;
2727 * for backward scanning inScan is < 0
2729 * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there.
2733 yaffs_Device *dev = in->myDev;
2735 yaffs_ExtendedTags existingTags;
2736 yaffs_ExtendedTags newTags;
2737 unsigned existingSerial, newSerial;
2739 if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
2740 /* Just ignore an attempt at putting a chunk into a non-file during scanning
2741 * If it is not during Scanning then something went wrong!
2744 T(YAFFS_TRACE_ERROR,
2746 ("yaffs tragedy:attempt to put data chunk into a non-file"
2751 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
2755 tn = yaffs_AddOrFindLevel0Tnode(dev,
2756 &in->variant.fileVariant,
2763 /* Dummy insert, bail now */
2766 existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
2769 /* If we're scanning then we need to test for duplicates
2770 * NB This does not need to be efficient since it should only ever
2771 * happen when the power fails during a write, then only one
2772 * chunk should ever be affected.
2774 * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
2775 * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
2778 if (existingChunk > 0) {
2779 /* NB Right now existing chunk will not be real chunkId if the chunk group size > 1
2780 * thus we have to do a FindChunkInFile to get the real chunk id.
2782 * We have a duplicate now we need to decide which one to use:
2784 * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
2785 * Forward scanning YAFFS2: The new one is what we use, dump the old one.
2786 * YAFFS1: Get both sets of tags and compare serial numbers.
2790 /* Only do this for forward scanning */
2791 yaffs_ReadChunkWithTagsFromNAND(dev,
2795 /* Do a proper find */
2797 yaffs_FindChunkInFile(in, chunkInInode,
2801 if (existingChunk <= 0) {
2802 /*Hoosterman - how did this happen? */
2804 T(YAFFS_TRACE_ERROR,
2806 ("yaffs tragedy: existing chunk < 0 in scan"
2811 /* NB The deleted flags should be false, otherwise the chunks will
2812 * not be loaded during a scan
2816 newSerial = newTags.serialNumber;
2817 existingSerial = existingTags.serialNumber;
2821 (existingChunk <= 0 ||
2822 ((existingSerial + 1) & 3) == newSerial)) {
2823 /* Forward scanning.
2825 * Delete the old one and drop through to update the tnode
2827 yaffs_DeleteChunk(dev, existingChunk, 1,
2830 /* Backward scanning or we want to use the existing one
2832 * Delete the new one and return early so that the tnode isn't changed
2834 yaffs_DeleteChunk(dev, chunkInNAND, 1,
2842 if (existingChunk == 0)
2845 yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
2850 static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
2853 int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
2855 if (chunkInNAND >= 0)
2856 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
2859 T(YAFFS_TRACE_NANDACCESS,
2860 (TSTR("Chunk %d not found zero instead" TENDSTR),
2862 /* get sane (zero) data if you read a hole */
2863 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
2869 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
2873 yaffs_ExtendedTags tags;
2874 yaffs_BlockInfo *bi;
2880 block = chunkId / dev->param.nChunksPerBlock;
2881 page = chunkId % dev->param.nChunksPerBlock;
2884 if (!yaffs_CheckChunkBit(dev, block, page))
2885 T(YAFFS_TRACE_VERIFY,
2886 (TSTR("Deleting invalid chunk %d"TENDSTR),
2889 bi = yaffs_GetBlockInfo(dev, block);
2891 yaffs2_UpdateOldestDirtySequence(dev, block, bi);
2893 T(YAFFS_TRACE_DELETION,
2894 (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
2896 if (!dev->param.isYaffs2 && markNAND &&
2897 bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
2899 yaffs_InitialiseTags(&tags);
2901 tags.chunkDeleted = 1;
2903 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
2904 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
2906 dev->nUnmarkedDeletions++;
2909 /* Pull out of the management area.
2910 * If the whole block became dirty, this will kick off an erasure.
2912 if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
2913 bi->blockState == YAFFS_BLOCK_STATE_FULL ||
2914 bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
2915 bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
2918 yaffs_ClearChunkBit(dev, block, page);
2922 if (bi->pagesInUse == 0 &&
2923 !bi->hasShrinkHeader &&
2924 bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
2925 bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
2926 yaffs_BlockBecameDirty(dev, block);
2933 static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
2934 const __u8 *buffer, int nBytes,
2937 /* Find old chunk Need to do this to get serial number
2938 * Write new one and patch into tree.
2939 * Invalidate old tags.
2943 yaffs_ExtendedTags prevTags;
2946 yaffs_ExtendedTags newTags;
2948 yaffs_Device *dev = in->myDev;
2950 yaffs_CheckGarbageCollection(dev,0);
2952 /* Get the previous chunk at this location in the file if it exists.
2953 * If it does not exist then put a zero into the tree. This creates
2954 * the tnode now, rather than later when it is harder to clean up.
2956 prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
2957 if(prevChunkId < 1 &&
2958 !yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0))
2961 /* Set up new tags */
2962 yaffs_InitialiseTags(&newTags);
2964 newTags.chunkId = chunkInInode;
2965 newTags.objectId = in->objectId;
2966 newTags.serialNumber =
2967 (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
2968 newTags.byteCount = nBytes;
2970 if (nBytes < 1 || nBytes > dev->param.totalBytesPerChunk) {
2971 T(YAFFS_TRACE_ERROR,
2972 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
2978 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
2981 if (newChunkId > 0) {
2982 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
2984 if (prevChunkId > 0)
2985 yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
2987 yaffs_VerifyFileSanity(in);
2993 /* UpdateObjectHeader updates the header on NAND for an object.
2994 * If name is not NULL, then that new name is used.
2996 int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
2997 int isShrink, int shadows, yaffs_XAttrMod *xmod)
3000 yaffs_BlockInfo *bi;
3002 yaffs_Device *dev = in->myDev;
3009 yaffs_ExtendedTags newTags;
3010 yaffs_ExtendedTags oldTags;
3011 const YCHAR *alias = NULL;
3013 __u8 *buffer = NULL;
3014 YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3016 yaffs_ObjectHeader *oh = NULL;
3018 yaffs_strcpy(oldName, _Y("silly old name"));
3022 in == dev->rootDir || /* The rootDir should also be saved */
3025 yaffs_CheckGarbageCollection(dev,0);
3026 yaffs_CheckObjectDetailsLoaded(in);
3028 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3029 oh = (yaffs_ObjectHeader *) buffer;
3031 prevChunkId = in->hdrChunk;
3033 if (prevChunkId > 0) {
3034 result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3037 yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
3039 memcpy(oldName, oh->name, sizeof(oh->name));
3040 memset(buffer, 0xFF, sizeof(yaffs_ObjectHeader));
3042 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3044 oh->type = in->variantType;
3045 oh->yst_mode = in->yst_mode;
3046 oh->shadowsObject = oh->inbandShadowsObject = shadows;
3048 #ifdef CONFIG_YAFFS_WINCE
3049 oh->win_atime[0] = in->win_atime[0];
3050 oh->win_ctime[0] = in->win_ctime[0];
3051 oh->win_mtime[0] = in->win_mtime[0];
3052 oh->win_atime[1] = in->win_atime[1];
3053 oh->win_ctime[1] = in->win_ctime[1];
3054 oh->win_mtime[1] = in->win_mtime[1];
3056 oh->yst_uid = in->yst_uid;
3057 oh->yst_gid = in->yst_gid;
3058 oh->yst_atime = in->yst_atime;
3059 oh->yst_mtime = in->yst_mtime;
3060 oh->yst_ctime = in->yst_ctime;
3061 oh->yst_rdev = in->yst_rdev;
3064 oh->parentObjectId = in->parent->objectId;
3066 oh->parentObjectId = 0;
3068 if (name && *name) {
3069 memset(oh->name, 0, sizeof(oh->name));
3070 yaffs_LoadObjectHeaderFromName(dev,oh->name,name);
3071 } else if (prevChunkId > 0)
3072 memcpy(oh->name, oldName, sizeof(oh->name));
3074 memset(oh->name, 0, sizeof(oh->name));
3076 oh->isShrink = isShrink;
3078 switch (in->variantType) {
3079 case YAFFS_OBJECT_TYPE_UNKNOWN:
3080 /* Should not happen */
3082 case YAFFS_OBJECT_TYPE_FILE:
3084 (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3085 || oh->parentObjectId ==
3086 YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3087 fileVariant.fileSize;
3089 case YAFFS_OBJECT_TYPE_HARDLINK:
3090 oh->equivalentObjectId =
3091 in->variant.hardLinkVariant.equivalentObjectId;
3093 case YAFFS_OBJECT_TYPE_SPECIAL:
3096 case YAFFS_OBJECT_TYPE_DIRECTORY:
3099 case YAFFS_OBJECT_TYPE_SYMLINK:
3100 alias = in->variant.symLinkVariant.alias;
3102 alias = _Y("no alias");
3103 yaffs_strncpy(oh->alias,
3105 YAFFS_MAX_ALIAS_LENGTH);
3106 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3110 /* process any xattrib modifications */
3112 yaffs_ApplyXMod(in, (char *)buffer, xmod);
3116 yaffs_InitialiseTags(&newTags);
3118 newTags.chunkId = 0;
3119 newTags.objectId = in->objectId;
3120 newTags.serialNumber = in->serial;
3122 /* Add extra info for file header */
3124 newTags.extraHeaderInfoAvailable = 1;
3125 newTags.extraParentObjectId = oh->parentObjectId;
3126 newTags.extraFileLength = oh->fileSize;
3127 newTags.extraIsShrinkHeader = oh->isShrink;
3128 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3129 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3130 newTags.extraObjectType = in->variantType;
3132 yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
3134 /* Create new chunk in NAND */
3136 yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3137 (prevChunkId > 0) ? 1 : 0);
3139 if (newChunkId >= 0) {
3141 in->hdrChunk = newChunkId;
3143 if (prevChunkId > 0) {
3144 yaffs_DeleteChunk(dev, prevChunkId, 1,
3148 if (!yaffs_ObjectHasCachedWriteData(in))
3151 /* If this was a shrink, then mark the block that the chunk lives on */
3153 bi = yaffs_GetBlockInfo(in->myDev,
3154 newChunkId / in->myDev->param.nChunksPerBlock);
3155 bi->hasShrinkHeader = 1;
3160 retVal = newChunkId;
3165 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3170 /*------------------------ Short Operations Cache ----------------------------------------
3171 * In many situations where there is no high level buffering (eg WinCE) a lot of
3172 * reads might be short sequential reads, and a lot of writes may be short
3173 * sequential writes. eg. scanning/writing a jpeg file.
3174 * In these cases, a short read/write cache can provide a huge perfomance benefit
3175 * with dumb-as-a-rock code.
3176 * In Linux, the page cache provides read buffering aand the short op cache provides write
3179 * There are a limited number (~10) of cache chunks per device so that we don't
3180 * need a very intelligent search.
3183 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3185 yaffs_Device *dev = obj->myDev;
3187 yaffs_ChunkCache *cache;
3188 int nCaches = obj->myDev->param.nShortOpCaches;
3190 for (i = 0; i < nCaches; i++) {
3191 cache = &dev->srCache[i];
3192 if (cache->object == obj &&
3201 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
3203 yaffs_Device *dev = obj->myDev;
3204 int lowest = -99; /* Stop compiler whining. */
3206 yaffs_ChunkCache *cache;
3207 int chunkWritten = 0;
3208 int nCaches = obj->myDev->param.nShortOpCaches;
3214 /* Find the dirty cache for this object with the lowest chunk id. */
3215 for (i = 0; i < nCaches; i++) {
3216 if (dev->srCache[i].object == obj &&
3217 dev->srCache[i].dirty) {
3219 || dev->srCache[i].chunkId <
3221 cache = &dev->srCache[i];
3222 lowest = cache->chunkId;
3227 if (cache && !cache->locked) {
3228 /* Write it out and free it up */
3231 yaffs_WriteChunkDataToObject(cache->object,
3237 cache->object = NULL;
3240 } while (cache && chunkWritten > 0);
3243 /* Hoosterman, disk full while writing cache out. */
3244 T(YAFFS_TRACE_ERROR,
3245 (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3252 /*yaffs_FlushEntireDeviceCache(dev)
3257 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
3260 int nCaches = dev->param.nShortOpCaches;
3263 /* Find a dirty object in the cache and flush it...
3264 * until there are no further dirty objects.
3268 for (i = 0; i < nCaches && !obj; i++) {
3269 if (dev->srCache[i].object &&
3270 dev->srCache[i].dirty)
3271 obj = dev->srCache[i].object;
3275 yaffs_FlushFilesChunkCache(obj);
3282 /* Grab us a cache chunk for use.
3283 * First look for an empty one.
3284 * Then look for the least recently used non-dirty one.
3285 * Then look for the least recently used dirty one...., flush and look again.
3287 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
3291 if (dev->param.nShortOpCaches > 0) {
3292 for (i = 0; i < dev->param.nShortOpCaches; i++) {
3293 if (!dev->srCache[i].object)
3294 return &dev->srCache[i];
3301 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
3303 yaffs_ChunkCache *cache;
3304 yaffs_Object *theObj;
3309 if (dev->param.nShortOpCaches > 0) {
3310 /* Try find a non-dirty one... */
3312 cache = yaffs_GrabChunkCacheWorker(dev);
3315 /* They were all dirty, find the last recently used object and flush
3316 * its cache, then find again.
3317 * NB what's here is not very accurate, we actually flush the object
3318 * the last recently used page.
3321 /* With locking we can't assume we can use entry zero */
3328 for (i = 0; i < dev->param.nShortOpCaches; i++) {
3329 if (dev->srCache[i].object &&
3330 !dev->srCache[i].locked &&
3331 (dev->srCache[i].lastUse < usage || !cache)) {
3332 usage = dev->srCache[i].lastUse;
3333 theObj = dev->srCache[i].object;
3334 cache = &dev->srCache[i];
3339 if (!cache || cache->dirty) {
3340 /* Flush and try again */
3341 yaffs_FlushFilesChunkCache(theObj);
3342 cache = yaffs_GrabChunkCacheWorker(dev);
3352 /* Find a cached chunk */
3353 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
3356 yaffs_Device *dev = obj->myDev;
3358 if (dev->param.nShortOpCaches > 0) {
3359 for (i = 0; i < dev->param.nShortOpCaches; i++) {
3360 if (dev->srCache[i].object == obj &&
3361 dev->srCache[i].chunkId == chunkId) {
3364 return &dev->srCache[i];
3371 /* Mark the chunk for the least recently used algorithym */
3372 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
3376 if (dev->param.nShortOpCaches > 0) {
3377 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
3378 /* Reset the cache usages */
3380 for (i = 1; i < dev->param.nShortOpCaches; i++)
3381 dev->srCache[i].lastUse = 0;
3388 cache->lastUse = dev->srLastUse;
3395 /* Invalidate a single cache page.
3396 * Do this when a whole page gets written,
3397 * ie the short cache for this page is no longer valid.
3399 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
3401 if (object->myDev->param.nShortOpCaches > 0) {
3402 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
3405 cache->object = NULL;
3409 /* Invalidate all the cache pages associated with this object
3410 * Do this whenever ther file is deleted or resized.
3412 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
3415 yaffs_Device *dev = in->myDev;
3417 if (dev->param.nShortOpCaches > 0) {
3418 /* Invalidate it. */
3419 for (i = 0; i < dev->param.nShortOpCaches; i++) {
3420 if (dev->srCache[i].object == in)
3421 dev->srCache[i].object = NULL;
3427 /*--------------------- File read/write ------------------------
3428 * Read and write have very similar structures.
3429 * In general the read/write has three parts to it
3430 * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3431 * Some complete chunks
3432 * An incomplete chunk to end off with
3434 * Curve-balls: the first chunk might also be the last chunk.
3437 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
3446 yaffs_ChunkCache *cache;
3453 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
3454 /* start = offset % dev->nDataBytesPerChunk; */
3455 yaffs_AddrToChunk(dev, offset, &chunk, &start);
3458 /* OK now check for the curveball where the start and end are in
3461 if ((start + n) < dev->nDataBytesPerChunk)
3464 nToCopy = dev->nDataBytesPerChunk - start;
3466 cache = yaffs_FindChunkCache(in, chunk);
3468 /* If the chunk is already in the cache or it is less than a whole chunk
3469 * or we're using inband tags then use the cache (if there is caching)
3470 * else bypass the cache.
3472 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
3473 if (dev->param.nShortOpCaches > 0) {
3475 /* If we can't find the data in the cache, then load it up. */
3478 cache = yaffs_GrabChunkCache(in->myDev);
3480 cache->chunkId = chunk;
3483 yaffs_ReadChunkDataFromObject(in, chunk,
3489 yaffs_UseChunkCache(dev, cache, 0);
3494 memcpy(buffer, &cache->data[start], nToCopy);
3498 /* Read into the local buffer then copy..*/
3501 yaffs_GetTempBuffer(dev, __LINE__);
3502 yaffs_ReadChunkDataFromObject(in, chunk,
3505 memcpy(buffer, &localBuffer[start], nToCopy);
3508 yaffs_ReleaseTempBuffer(dev, localBuffer,
3514 /* A full chunk. Read directly into the supplied buffer. */
3515 yaffs_ReadChunkDataFromObject(in, chunk, buffer);
3529 int yaffs_DoWriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
3530 int nBytes, int writeThrough)
3539 int startOfWrite = offset;
3540 int chunkWritten = 0;
3548 while (n > 0 && chunkWritten >= 0) {
3549 yaffs_AddrToChunk(dev, offset, &chunk, &start);
3551 if (chunk * dev->nDataBytesPerChunk + start != offset ||
3552 start >= dev->nDataBytesPerChunk) {
3553 T(YAFFS_TRACE_ERROR, (
3554 TSTR("AddrToChunk of offset %d gives chunk %d start %d"
3556 (int)offset, chunk, start));
3558 chunk++; /* File pos to chunk in file offset */
3560 /* OK now check for the curveball where the start and end are in
3564 if ((start + n) < dev->nDataBytesPerChunk) {
3567 /* Now folks, to calculate how many bytes to write back....
3568 * If we're overwriting and not writing to then end of file then
3569 * we need to write back as much as was there before.
3572 chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
3574 if (chunkStart > in->variant.fileVariant.fileSize)
3575 nBytesRead = 0; /* Past end of file */
3577 nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
3579 if (nBytesRead > dev->nDataBytesPerChunk)
3580 nBytesRead = dev->nDataBytesPerChunk;
3584 (start + n)) ? nBytesRead : (start + n);
3586 if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
3590 nToCopy = dev->nDataBytesPerChunk - start;
3591 nToWriteBack = dev->nDataBytesPerChunk;
3594 if (nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
3595 /* An incomplete start or end chunk (or maybe both start and end chunk),
3596 * or we're using inband tags, so we want to use the cache buffers.
3598 if (dev->param.nShortOpCaches > 0) {
3599 yaffs_ChunkCache *cache;
3600 /* If we can't find the data in the cache, then load the cache */
3601 cache = yaffs_FindChunkCache(in, chunk);
3604 && yaffs_CheckSpaceForAllocation(dev, 1)) {
3605 cache = yaffs_GrabChunkCache(dev);
3607 cache->chunkId = chunk;
3610 yaffs_ReadChunkDataFromObject(in, chunk,
3614 !yaffs_CheckSpaceForAllocation(dev, 1)) {
3615 /* Drop the cache if it was a read cache item and
3616 * no space check has been made for it.
3622 yaffs_UseChunkCache(dev, cache, 1);
3626 memcpy(&cache->data[start], buffer,
3631 cache->nBytes = nToWriteBack;
3635 yaffs_WriteChunkDataToObject
3638 cache->data, cache->nBytes,
3644 chunkWritten = -1; /* fail the write */
3647 /* An incomplete start or end chunk (or maybe both start and end chunk)
3648 * Read into the local buffer then copy, then copy over and write back.
3652 yaffs_GetTempBuffer(dev, __LINE__);
3654 yaffs_ReadChunkDataFromObject(in, chunk,
3659 memcpy(&localBuffer[start], buffer, nToCopy);
3662 yaffs_WriteChunkDataToObject(in, chunk,
3667 yaffs_ReleaseTempBuffer(dev, localBuffer,
3673 /* A full chunk. Write directly from the supplied buffer. */
3678 yaffs_WriteChunkDataToObject(in, chunk, buffer,
3679 dev->nDataBytesPerChunk,
3682 /* Since we've overwritten the cached data, we better invalidate it. */
3683 yaffs_InvalidateChunkCache(in, chunk);
3686 if (chunkWritten >= 0) {
3695 /* Update file object */
3697 if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
3698 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
3705 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
3706 int nBytes, int writeThrough)
3708 yaffs2_HandleHole(in,offset);
3709 return yaffs_DoWriteDataToFile(in,buffer,offset,nBytes,writeThrough);
3714 /* ---------------------- File resizing stuff ------------------ */
3716 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
3719 yaffs_Device *dev = in->myDev;
3720 int oldFileSize = in->variant.fileVariant.fileSize;
3722 int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
3724 int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
3725 dev->nDataBytesPerChunk;
3729 /* Delete backwards so that we don't end up with holes if
3730 * power is lost part-way through the operation.
3732 for (i = lastDel; i >= startDel; i--) {
3733 /* NB this could be optimised somewhat,
3734 * eg. could retrieve the tags and write them without
3735 * using yaffs_DeleteChunk
3738 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
3741 (dev->internalStartBlock * dev->param.nChunksPerBlock)
3743 ((dev->internalEndBlock +
3744 1) * dev->param.nChunksPerBlock)) {
3745 T(YAFFS_TRACE_ALWAYS,
3746 (TSTR("Found daft chunkId %d for %d" TENDSTR),
3750 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
3758 void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize)
3761 __u32 newSizeOfPartialChunk;
3762 yaffs_Device *dev = obj->myDev;
3764 yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
3766 yaffs_PruneResizedChunks(obj, newSize);
3768 if (newSizeOfPartialChunk != 0) {
3769 int lastChunk = 1 + newFullChunks;
3770 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
3772 /* Got to read and rewrite the last chunk with its new size and zero pad */
3773 yaffs_ReadChunkDataFromObject(obj, lastChunk, localBuffer);
3774 memset(localBuffer + newSizeOfPartialChunk, 0,
3775 dev->nDataBytesPerChunk - newSizeOfPartialChunk);
3777 yaffs_WriteChunkDataToObject(obj, lastChunk, localBuffer,
3778 newSizeOfPartialChunk, 1);
3780 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
3783 obj->variant.fileVariant.fileSize = newSize;
3785 yaffs_PruneFileStructure(dev, &obj->variant.fileVariant);
3789 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
3791 yaffs_Device *dev = in->myDev;
3792 int oldFileSize = in->variant.fileVariant.fileSize;
3794 yaffs_FlushFilesChunkCache(in);
3795 yaffs_InvalidateWholeChunkCache(in);
3797 yaffs_CheckGarbageCollection(dev,0);
3799 if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
3802 if (newSize == oldFileSize)
3805 if(newSize > oldFileSize){
3806 yaffs2_HandleHole(in,newSize);
3807 in->variant.fileVariant.fileSize = newSize;
3809 /* newSize < oldFileSize */
3810 yaffs_ResizeDown(in, newSize);
3813 /* Write a new object header to reflect the resize.
3814 * show we've shrunk the file, if need be
3815 * Do this only if the file is not in the deleted directories
3816 * and is not shadowed.
3820 in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
3821 in->parent->objectId != YAFFS_OBJECTID_DELETED)
3822 yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0, NULL);
3828 loff_t yaffs_GetFileSize(yaffs_Object *obj)
3830 YCHAR *alias = NULL;
3831 obj = yaffs_GetEquivalentObject(obj);
3833 switch (obj->variantType) {
3834 case YAFFS_OBJECT_TYPE_FILE:
3835 return obj->variant.fileVariant.fileSize;
3836 case YAFFS_OBJECT_TYPE_SYMLINK:
3837 alias = obj->variant.symLinkVariant.alias;
3840 return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
3848 int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
3852 yaffs_FlushFilesChunkCache(in);
3853 if(dataSync) /* Only sync data */
3857 #ifdef CONFIG_YAFFS_WINCE
3858 yfsd_WinFileTimeNow(in->win_mtime);
3861 in->yst_mtime = Y_CURRENT_TIME;
3866 retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0, NULL) >=
3867 0) ? YAFFS_OK : YAFFS_FAIL;
3877 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
3880 /* First off, invalidate the file's data in the cache, without flushing. */
3881 yaffs_InvalidateWholeChunkCache(in);
3883 if (in->myDev->param.isYaffs2 && (in->parent != in->myDev->deletedDir)) {
3884 /* Move to the unlinked directory so we have a record that it was deleted. */
3885 yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
3889 yaffs_RemoveObjectFromDirectory(in);
3890 yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
3893 yaffs_FreeObject(in);
3898 /* yaffs_DeleteFile deletes the whole file data
3899 * and the inode associated with the file.
3900 * It does not delete the links associated with the file.
3902 static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
3906 int immediateDeletion = 0;
3907 yaffs_Device *dev = in->myDev;
3910 immediateDeletion = 1;
3912 if (immediateDeletion) {
3914 yaffs_ChangeObjectName(in, in->myDev->deletedDir,
3915 _Y("deleted"), 0, 0);
3916 T(YAFFS_TRACE_TRACING,
3917 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
3920 in->myDev->nDeletedFiles++;
3921 if (dev->param.disableSoftDelete || dev->param.isYaffs2)
3922 yaffs_ResizeFile(in, 0);
3923 yaffs_SoftDeleteFile(in);
3926 yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
3927 _Y("unlinked"), 0, 0);
3934 int yaffs_DeleteFile(yaffs_Object *in)
3936 int retVal = YAFFS_OK;
3937 int deleted; /* Need to cache value on stack if in is freed */
3938 yaffs_Device *dev = in->myDev;
3940 if (dev->param.disableSoftDelete || dev->param.isYaffs2)
3941 yaffs_ResizeFile(in, 0);
3943 if (in->nDataChunks > 0) {
3944 /* Use soft deletion if there is data in the file.
3945 * That won't be the case if it has been resized to zero.
3948 retVal = yaffs_UnlinkFileIfNeeded(in);
3950 deleted = in->deleted;
3952 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
3955 in->myDev->nDeletedFiles++;
3956 yaffs_SoftDeleteFile(in);
3958 return deleted ? YAFFS_OK : YAFFS_FAIL;
3960 /* The file has no data chunks so we toss it immediately */
3961 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
3962 in->variant.fileVariant.top = NULL;
3963 yaffs_DoGenericObjectDeletion(in);
3969 static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
3971 return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
3972 !(ylist_empty(&obj->variant.directoryVariant.children));
3975 static int yaffs_DeleteDirectory(yaffs_Object *obj)
3977 /* First check that the directory is empty. */
3978 if (yaffs_IsNonEmptyDirectory(obj))
3981 return yaffs_DoGenericObjectDeletion(obj);
3984 static int yaffs_DeleteSymLink(yaffs_Object *in)
3986 if(in->variant.symLinkVariant.alias)
3987 YFREE(in->variant.symLinkVariant.alias);
3988 in->variant.symLinkVariant.alias=NULL;
3990 return yaffs_DoGenericObjectDeletion(in);
3993 static int yaffs_DeleteHardLink(yaffs_Object *in)
3995 /* remove this hardlink from the list assocaited with the equivalent
3998 ylist_del_init(&in->hardLinks);
3999 return yaffs_DoGenericObjectDeletion(in);
4002 int yaffs_DeleteObject(yaffs_Object *obj)
4005 switch (obj->variantType) {
4006 case YAFFS_OBJECT_TYPE_FILE:
4007 retVal = yaffs_DeleteFile(obj);
4009 case YAFFS_OBJECT_TYPE_DIRECTORY:
4010 if(!ylist_empty(&obj->variant.directoryVariant.dirty)){
4011 T(YAFFS_TRACE_BACKGROUND, (TSTR("Remove object %d from dirty directories" TENDSTR),obj->objectId));
4012 ylist_del_init(&obj->variant.directoryVariant.dirty);
4014 return yaffs_DeleteDirectory(obj);
4016 case YAFFS_OBJECT_TYPE_SYMLINK:
4017 retVal = yaffs_DeleteSymLink(obj);
4019 case YAFFS_OBJECT_TYPE_HARDLINK:
4020 retVal = yaffs_DeleteHardLink(obj);
4022 case YAFFS_OBJECT_TYPE_SPECIAL:
4023 retVal = yaffs_DoGenericObjectDeletion(obj);
4025 case YAFFS_OBJECT_TYPE_UNKNOWN:
4027 break; /* should not happen. */
4033 static int yaffs_UnlinkWorker(yaffs_Object *obj)
4036 int immediateDeletion = 0;
4039 immediateDeletion = 1;
4042 yaffs_UpdateParent(obj->parent);
4044 if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4045 return yaffs_DeleteHardLink(obj);
4046 } else if (!ylist_empty(&obj->hardLinks)) {
4047 /* Curve ball: We're unlinking an object that has a hardlink.
4049 * This problem arises because we are not strictly following
4050 * The Linux link/inode model.
4052 * We can't really delete the object.
4053 * Instead, we do the following:
4054 * - Select a hardlink.
4055 * - Unhook it from the hard links
4056 * - Move it from its parent directory (so that the rename can work)
4057 * - Rename the object to the hardlink's name.
4058 * - Delete the hardlink
4062 yaffs_Object *parent;
4064 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
4066 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
4068 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
4069 parent = hl->parent;
4071 ylist_del_init(&hl->hardLinks);
4073 yaffs_AddObjectToDirectory(obj->myDev->unlinkedDir, hl);
4075 retVal = yaffs_ChangeObjectName(obj,parent, name, 0, 0);
4077 if (retVal == YAFFS_OK)
4078 retVal = yaffs_DoGenericObjectDeletion(hl);
4082 } else if (immediateDeletion) {
4083 switch (obj->variantType) {
4084 case YAFFS_OBJECT_TYPE_FILE:
4085 return yaffs_DeleteFile(obj);
4087 case YAFFS_OBJECT_TYPE_DIRECTORY:
4088 ylist_del_init(&obj->variant.directoryVariant.dirty);
4089 return yaffs_DeleteDirectory(obj);
4091 case YAFFS_OBJECT_TYPE_SYMLINK:
4092 return yaffs_DeleteSymLink(obj);
4094 case YAFFS_OBJECT_TYPE_SPECIAL:
4095 return yaffs_DoGenericObjectDeletion(obj);
4097 case YAFFS_OBJECT_TYPE_HARDLINK:
4098 case YAFFS_OBJECT_TYPE_UNKNOWN:
4102 } else if(yaffs_IsNonEmptyDirectory(obj))
4105 return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
4106 _Y("unlinked"), 0, 0);
4110 static int yaffs_UnlinkObject(yaffs_Object *obj)
4113 if (obj && obj->unlinkAllowed)
4114 return yaffs_UnlinkWorker(obj);
4119 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
4123 obj = yaffs_FindObjectByName(dir, name);
4124 return yaffs_UnlinkObject(obj);
4127 /*----------------------- Initialisation Scanning ---------------------- */
4129 void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
4130 int backwardScanning)
4134 if (!backwardScanning) {
4135 /* Handle YAFFS1 forward scanning case
4136 * For YAFFS1 we always do the deletion
4140 /* Handle YAFFS2 case (backward scanning)
4141 * If the shadowed object exists then ignore.
4143 obj = yaffs_FindObjectByNumber(dev, objId);
4148 /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
4149 * We put it in unlinked dir to be cleaned up after the scanning
4152 yaffs_FindOrCreateObjectByNumber(dev, objId,
4153 YAFFS_OBJECT_TYPE_FILE);
4156 obj->isShadowed = 1;
4157 yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
4158 obj->variant.fileVariant.shrinkSize = 0;
4159 obj->valid = 1; /* So that we don't read any other info for this file */
4164 void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
4171 hardList = (yaffs_Object *) (hardList->hardLinks.next);
4173 in = yaffs_FindObjectByNumber(dev,
4174 hl->variant.hardLinkVariant.
4175 equivalentObjectId);
4178 /* Add the hardlink pointers */
4179 hl->variant.hardLinkVariant.equivalentObject = in;
4180 ylist_add(&hl->hardLinks, &in->hardLinks);
4182 /* Todo Need to report/handle this better.
4183 * Got a problem... hardlink to a non-existant object
4185 hl->variant.hardLinkVariant.equivalentObject = NULL;
4186 YINIT_LIST_HEAD(&hl->hardLinks);
4193 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
4196 * Sort out state of unlinked and deleted objects after scanning.
4198 struct ylist_head *i;
4199 struct ylist_head *n;
4205 /* Soft delete all the unlinked files */
4206 ylist_for_each_safe(i, n,
4207 &dev->unlinkedDir->variant.directoryVariant.children) {
4209 l = ylist_entry(i, yaffs_Object, siblings);
4210 yaffs_DeleteObject(l);
4214 ylist_for_each_safe(i, n,
4215 &dev->deletedDir->variant.directoryVariant.children) {
4217 l = ylist_entry(i, yaffs_Object, siblings);
4218 yaffs_DeleteObject(l);
4225 * This code iterates through all the objects making sure that they are rooted.
4226 * Any unrooted objects are re-rooted in lost+found.
4227 * An object needs to be in one of:
4228 * - Directly under deleted, unlinked
4229 * - Directly or indirectly under root.
4232 * This code assumes that we don't ever change the current relationships between
4234 * rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL
4235 * lostNfound->parent == rootDir
4237 * This fixes the problem where directories might have inadvertently been deleted
4238 * leaving the object "hanging" without being rooted in the directory tree.
4241 static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj)
4243 return (obj == dev->deletedDir ||
4244 obj == dev->unlinkedDir||
4245 obj == dev->rootDir);
4248 static void yaffs_FixHangingObjects(yaffs_Device *dev)
4251 yaffs_Object *parent;
4253 struct ylist_head *lh;
4254 struct ylist_head *n;
4261 /* Iterate through the objects in each hash entry,
4262 * looking at each object.
4263 * Make sure it is rooted.
4266 for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
4267 ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) {
4269 obj = ylist_entry(lh, yaffs_Object, hashLink);
4270 parent= obj->parent;
4272 if(yaffs_HasNULLParent(dev,obj)){
4273 /* These directories are not hanging */
4276 else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
4278 else if(yaffs_HasNULLParent(dev,parent))
4282 * Need to follow the parent chain to see if it is hanging.
4287 while(parent != dev->rootDir &&
4289 parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
4291 parent = parent->parent;
4294 if(parent != dev->rootDir)
4299 (TSTR("Hanging object %d moved to lost and found" TENDSTR),
4301 yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj);
4310 * Delete directory contents for cleaning up lost and found.
4312 static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
4315 struct ylist_head *lh;
4316 struct ylist_head *n;
4318 if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
4321 ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) {
4323 obj = ylist_entry(lh, yaffs_Object, siblings);
4324 if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
4325 yaffs_DeleteDirectoryContents(obj);
4328 (TSTR("Deleting lost_found object %d" TENDSTR),
4331 /* Need to use UnlinkObject since Delete would not handle
4332 * hardlinked objects correctly.
4334 yaffs_UnlinkObject(obj);
4340 static void yaffs_EmptyLostAndFound(yaffs_Device *dev)
4342 yaffs_DeleteDirectoryContents(dev->lostNFoundDir);
4345 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
4348 yaffs_ObjectHeader *oh;
4350 yaffs_ExtendedTags tags;
4352 int alloc_failed = 0;
4360 T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
4362 in->lazyLoaded ? "not yet" : "already"));
4365 if (in->lazyLoaded && in->hdrChunk > 0) {
4367 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
4369 result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
4370 oh = (yaffs_ObjectHeader *) chunkData;
4372 in->yst_mode = oh->yst_mode;
4373 #ifdef CONFIG_YAFFS_WINCE
4374 in->win_atime[0] = oh->win_atime[0];
4375 in->win_ctime[0] = oh->win_ctime[0];
4376 in->win_mtime[0] = oh->win_mtime[0];
4377 in->win_atime[1] = oh->win_atime[1];
4378 in->win_ctime[1] = oh->win_ctime[1];
4379 in->win_mtime[1] = oh->win_mtime[1];
4381 in->yst_uid = oh->yst_uid;
4382 in->yst_gid = oh->yst_gid;
4383 in->yst_atime = oh->yst_atime;
4384 in->yst_mtime = oh->yst_mtime;
4385 in->yst_ctime = oh->yst_ctime;
4386 in->yst_rdev = oh->yst_rdev;
4389 yaffs_SetObjectNameFromOH(in, oh);
4391 if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
4392 in->variant.symLinkVariant.alias =
4393 yaffs_CloneString(oh->alias);
4394 if (!in->variant.symLinkVariant.alias)
4395 alloc_failed = 1; /* Not returned to caller */
4398 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
4402 /*------------------------------ Directory Functions ----------------------------- */
4405 *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
4406 * link (ie. name) is created or deleted in the directory.
4409 * create dir/a : update dir's mtime/ctime
4410 * rm dir/a: update dir's mtime/ctime
4411 * modify dir/a: don't update dir's mtimme/ctime
4413 * This can be handled immediately or defered. Defering helps reduce the number
4414 * of updates when many files in a directory are changed within a brief period.
4416 * If the directory updating is defered then yaffs_UpdateDirtyDirecories must be
4417 * called periodically.
4420 static void yaffs_UpdateParent(yaffs_Object *obj)
4425 #ifndef CONFIG_YAFFS_WINCE
4429 obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
4430 if(dev->param.deferDirectoryUpdate){
4431 struct ylist_head *link = &obj->variant.directoryVariant.dirty;
4433 if(ylist_empty(link)){
4434 ylist_add(link,&dev->dirtyDirectories);
4435 T(YAFFS_TRACE_BACKGROUND, (TSTR("Added object %d to dirty directories" TENDSTR),obj->objectId));
4439 yaffs_UpdateObjectHeader(obj, NULL, 0, 0, 0, NULL);
4443 void yaffs_UpdateDirtyDirectories(yaffs_Device *dev)
4445 struct ylist_head *link;
4447 yaffs_DirectoryStructure *dS;
4448 yaffs_ObjectVariant *oV;
4450 T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR)));
4452 while(!ylist_empty(&dev->dirtyDirectories)){
4453 link = dev->dirtyDirectories.next;
4454 ylist_del_init(link);
4456 dS=ylist_entry(link,yaffs_DirectoryStructure,dirty);
4457 oV = ylist_entry(dS,yaffs_ObjectVariant,directoryVariant);
4458 obj = ylist_entry(oV,yaffs_Object,variant);
4460 T(YAFFS_TRACE_BACKGROUND, (TSTR("Update directory %d" TENDSTR), obj->objectId));
4463 yaffs_UpdateObjectHeader(obj, NULL, 0, 0, 0, NULL);
4467 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
4469 yaffs_Device *dev = obj->myDev;
4470 yaffs_Object *parent;
4472 yaffs_VerifyObjectInDirectory(obj);
4473 parent = obj->parent;
4475 yaffs_VerifyDirectory(parent);
4477 if (dev && dev->param.removeObjectCallback)
4478 dev->param.removeObjectCallback(obj);
4481 ylist_del_init(&obj->siblings);
4484 yaffs_VerifyDirectory(parent);
4487 void yaffs_AddObjectToDirectory(yaffs_Object *directory,
4491 T(YAFFS_TRACE_ALWAYS,
4493 ("tragedy: Trying to add an object to a null pointer directory"
4498 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4499 T(YAFFS_TRACE_ALWAYS,
4501 ("tragedy: Trying to add an object to a non-directory"
4506 if (obj->siblings.prev == NULL) {
4507 /* Not initialised */
4512 yaffs_VerifyDirectory(directory);
4514 yaffs_RemoveObjectFromDirectory(obj);
4518 ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
4519 obj->parent = directory;
4521 if (directory == obj->myDev->unlinkedDir
4522 || directory == obj->myDev->deletedDir) {
4524 obj->myDev->nUnlinkedFiles++;
4525 obj->renameAllowed = 0;
4528 yaffs_VerifyDirectory(directory);
4529 yaffs_VerifyObjectInDirectory(obj);
4532 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
4537 struct ylist_head *i;
4538 YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
4546 T(YAFFS_TRACE_ALWAYS,
4548 ("tragedy: yaffs_FindObjectByName: null pointer directory"
4553 if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4554 T(YAFFS_TRACE_ALWAYS,
4556 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
4560 sum = yaffs_CalcNameSum(name);
4562 ylist_for_each(i, &directory->variant.directoryVariant.children) {
4564 l = ylist_entry(i, yaffs_Object, siblings);
4566 if (l->parent != directory)
4569 yaffs_CheckObjectDetailsLoaded(l);
4571 /* Special case for lost-n-found */
4572 if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
4573 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
4575 } else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
4576 /* LostnFound chunk called Objxxx
4579 yaffs_GetObjectName(l, buffer,
4580 YAFFS_MAX_NAME_LENGTH + 1);
4581 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
4592 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
4593 int (*fn) (yaffs_Object *))
4595 struct ylist_head *i;
4599 T(YAFFS_TRACE_ALWAYS,
4601 ("tragedy: yaffs_FindObjectByName: null pointer directory"
4606 if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4607 T(YAFFS_TRACE_ALWAYS,
4609 ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
4614 ylist_for_each(i, &theDir->variant.directoryVariant.children) {
4616 l = ylist_entry(i, yaffs_Object, siblings);
4627 /* GetEquivalentObject dereferences any hard links to get to the
4631 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
4633 if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4634 /* We want the object id of the equivalent object, not this one */
4635 obj = obj->variant.hardLinkVariant.equivalentObject;
4636 yaffs_CheckObjectDetailsLoaded(obj);
4642 * A note or two on object names.
4643 * * If the object name is missing, we then make one up in the form objnnn
4645 * * ASCII names are stored in the object header's name field from byte zero
4646 * * Unicode names are historically stored starting from byte zero.
4648 * Then there are automatic Unicode names...
4649 * The purpose of these is to save names in a way that can be read as
4650 * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
4651 * system to share files.
4653 * These automatic unicode are stored slightly differently...
4654 * - If the name can fit in the ASCII character space then they are saved as
4655 * ascii names as per above.
4656 * - If the name needs Unicode then the name is saved in Unicode
4657 * starting at oh->name[1].
4660 static void yaffs_FixNullName(yaffs_Object * obj,YCHAR * name, int buffSize)
4662 /* Create an object name if we could not find one. */
4663 if(yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH) == 0){
4665 YCHAR numString[20];
4666 YCHAR *x = &numString[19];
4667 unsigned v = obj->objectId;
4671 *x = '0' + (v % 10);
4674 /* make up a name */
4675 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
4676 yaffs_strcat(locName,x);
4677 yaffs_strncpy(name, locName, buffSize - 1);
4681 static void yaffs_LoadNameFromObjectHeader(yaffs_Device *dev,YCHAR *name, const YCHAR *ohName, int bufferSize)
4683 #ifdef CONFIG_YAFFS_AUTO_UNICODE
4684 if(dev->param.autoUnicode){
4686 /* It is an ASCII name, so do an ASCII to unicode conversion */
4687 const char *asciiOhName = (const char *)ohName;
4688 int n = bufferSize - 1;
4689 while(n > 0 && *asciiOhName){
4690 *name = *asciiOhName;
4696 yaffs_strncpy(name,ohName+1, bufferSize -1);
4699 yaffs_strncpy(name, ohName, bufferSize - 1);
4703 static void yaffs_LoadObjectHeaderFromName(yaffs_Device *dev, YCHAR *ohName, const YCHAR *name)
4705 #ifdef CONFIG_YAFFS_AUTO_UNICODE
4710 if(dev->param.autoUnicode){
4715 /* Figure out if the name will fit in ascii character set */
4716 while(isAscii && *w){
4723 /* It is an ASCII name, so do a unicode to ascii conversion */
4724 char *asciiOhName = (char *)ohName;
4725 int n = YAFFS_MAX_NAME_LENGTH - 1;
4726 while(n > 0 && *name){
4727 *asciiOhName= *name;
4733 /* It is a unicode name, so save starting at the second YCHAR */
4735 yaffs_strncpy(ohName+1,name, YAFFS_MAX_NAME_LENGTH -2);
4740 yaffs_strncpy(ohName,name, YAFFS_MAX_NAME_LENGTH - 1);
4744 int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
4746 memset(name, 0, buffSize * sizeof(YCHAR));
4748 yaffs_CheckObjectDetailsLoaded(obj);
4750 if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
4751 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
4753 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
4754 else if (obj->shortName[0]) {
4755 yaffs_strcpy(name, obj->shortName);
4758 else if(obj->hdrChunk > 0) {
4760 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
4762 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
4764 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
4766 if (obj->hdrChunk > 0) {
4767 result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
4768 obj->hdrChunk, buffer,
4771 yaffs_LoadNameFromObjectHeader(obj->myDev,name,oh->name,buffSize);
4773 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
4776 yaffs_FixNullName(obj,name,buffSize);
4778 return yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH);
4782 int yaffs_GetObjectFileLength(yaffs_Object *obj)
4784 /* Dereference any hard linking */
4785 obj = yaffs_GetEquivalentObject(obj);
4787 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4788 return obj->variant.fileVariant.fileSize;
4789 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
4790 if(!obj->variant.symLinkVariant.alias)
4792 return yaffs_strnlen(obj->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
4794 /* Only a directory should drop through to here */
4795 return obj->myDev->nDataBytesPerChunk;
4799 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
4802 struct ylist_head *i;
4805 count++; /* the object itself */
4807 ylist_for_each(i, &obj->hardLinks)
4808 count++; /* add the hard links; */
4813 int yaffs_GetObjectInode(yaffs_Object *obj)
4815 obj = yaffs_GetEquivalentObject(obj);
4817 return obj->objectId;
4820 unsigned yaffs_GetObjectType(yaffs_Object *obj)
4822 obj = yaffs_GetEquivalentObject(obj);
4824 switch (obj->variantType) {
4825 case YAFFS_OBJECT_TYPE_FILE:
4828 case YAFFS_OBJECT_TYPE_DIRECTORY:
4831 case YAFFS_OBJECT_TYPE_SYMLINK:
4834 case YAFFS_OBJECT_TYPE_HARDLINK:
4837 case YAFFS_OBJECT_TYPE_SPECIAL:
4838 if (S_ISFIFO(obj->yst_mode))
4840 if (S_ISCHR(obj->yst_mode))
4842 if (S_ISBLK(obj->yst_mode))
4844 if (S_ISSOCK(obj->yst_mode))
4852 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
4854 obj = yaffs_GetEquivalentObject(obj);
4855 if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
4856 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
4858 return yaffs_CloneString(_Y(""));
4861 #ifndef CONFIG_YAFFS_WINCE
4863 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
4865 unsigned int valid = attr->ia_valid;
4867 if (valid & ATTR_MODE)
4868 obj->yst_mode = attr->ia_mode;
4869 if (valid & ATTR_UID)
4870 obj->yst_uid = attr->ia_uid;
4871 if (valid & ATTR_GID)
4872 obj->yst_gid = attr->ia_gid;
4874 if (valid & ATTR_ATIME)
4875 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
4876 if (valid & ATTR_CTIME)
4877 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
4878 if (valid & ATTR_MTIME)
4879 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
4881 if (valid & ATTR_SIZE)
4882 yaffs_ResizeFile(obj, attr->ia_size);
4884 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0, NULL);
4889 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
4891 unsigned int valid = 0;
4893 attr->ia_mode = obj->yst_mode;
4895 attr->ia_uid = obj->yst_uid;
4897 attr->ia_gid = obj->yst_gid;
4900 Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
4901 valid |= ATTR_ATIME;
4902 Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
4903 valid |= ATTR_CTIME;
4904 Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
4905 valid |= ATTR_MTIME;
4907 attr->ia_size = yaffs_GetFileSize(obj);
4910 attr->ia_valid = valid;
4918 static int yaffs_DoXMod(yaffs_Object *obj, int set, const YCHAR *name, const void *value, int size, int flags)
4920 yaffs_XAttrMod xmod;
4929 xmod.result = -ENOSPC;
4931 result = yaffs_UpdateObjectHeader(obj, NULL, 0, 0, 0, &xmod);
4939 static int yaffs_ApplyXMod(yaffs_Object *obj, char *buffer, yaffs_XAttrMod *xmod)
4942 int x_offs = sizeof(yaffs_ObjectHeader);
4943 yaffs_Device *dev = obj->myDev;
4944 int x_size = dev->nDataBytesPerChunk - sizeof(yaffs_ObjectHeader);
4946 char * x_buffer = buffer + x_offs;
4949 retval = nval_set(x_buffer, x_size, xmod->name, xmod->data, xmod->size, xmod->flags);
4951 retval = nval_del(x_buffer, x_size, xmod->name);
4953 obj->hasXattr = nval_hasvalues(x_buffer, x_size);
4954 obj->xattrKnown = 1;
4956 xmod->result = retval;
4961 static int yaffs_DoXFetch(yaffs_Object *obj, const YCHAR *name, void *value, int size)
4963 char *buffer = NULL;
4965 yaffs_ExtendedTags tags;
4966 yaffs_Device *dev = obj->myDev;
4967 int x_offs = sizeof(yaffs_ObjectHeader);
4968 int x_size = dev->nDataBytesPerChunk - sizeof(yaffs_ObjectHeader);
4974 if(obj->hdrChunk < 1)
4977 /* If we know that the object has no xattribs then don't do all the
4978 * reading and parsing.
4980 if(obj->xattrKnown && !obj->hasXattr){
4987 buffer = (char *) yaffs_GetTempBuffer(dev, __LINE__);
4991 result = yaffs_ReadChunkWithTagsFromNAND(dev,obj->hdrChunk, (__u8 *)buffer, &tags);
4993 if(result != YAFFS_OK)
4996 x_buffer = buffer + x_offs;
4998 if (!obj->xattrKnown){
4999 obj->hasXattr = nval_hasvalues(x_buffer, x_size);
5000 obj->xattrKnown = 1;
5004 retval = nval_get(x_buffer, x_size, name, value, size);
5006 retval = nval_list(x_buffer, x_size, value,size);
5008 yaffs_ReleaseTempBuffer(dev,(__u8 *)buffer,__LINE__);
5012 int yaffs_SetXAttribute(yaffs_Object *obj, const YCHAR *name, const void * value, int size, int flags)
5014 return yaffs_DoXMod(obj, 1, name, value, size, flags);
5017 int yaffs_RemoveXAttribute(yaffs_Object *obj, const YCHAR *name)
5019 return yaffs_DoXMod(obj, 0, name, NULL, 0, 0);
5022 int yaffs_GetXAttribute(yaffs_Object *obj, const YCHAR *name, void *value, int size)
5024 return yaffs_DoXFetch(obj, name, value, size);
5027 int yaffs_ListXAttributes(yaffs_Object *obj, char *buffer, int size)
5029 return yaffs_DoXFetch(obj, NULL, buffer,size);
5035 int yaffs_DumpObject(yaffs_Object *obj)
5039 yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
5041 T(YAFFS_TRACE_ALWAYS,
5043 ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
5044 " chunk %d type %d size %d\n"
5045 TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
5046 obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
5047 yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
5053 /*---------------------------- Initialisation code -------------------------------------- */
5055 static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
5058 /* Common functions, gotta have */
5059 if (!dev->param.eraseBlockInNAND || !dev->param.initialiseNAND)
5062 #ifdef CONFIG_YAFFS_YAFFS2
5064 /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
5065 if (dev->param.writeChunkWithTagsToNAND &&
5066 dev->param.readChunkWithTagsFromNAND &&
5067 !dev->param.writeChunkToNAND &&
5068 !dev->param.readChunkFromNAND &&
5069 dev->param.markNANDBlockBad &&
5070 dev->param.queryNANDBlock)
5074 /* Can use the "spare" style interface for yaffs1 */
5075 if (!dev->param.isYaffs2 &&
5076 !dev->param.writeChunkWithTagsToNAND &&
5077 !dev->param.readChunkWithTagsFromNAND &&
5078 dev->param.writeChunkToNAND &&
5079 dev->param.readChunkFromNAND &&
5080 !dev->param.markNANDBlockBad &&
5081 !dev->param.queryNANDBlock)
5088 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
5090 /* Initialise the unlinked, deleted, root and lost and found directories */
5092 dev->lostNFoundDir = dev->rootDir = NULL;
5093 dev->unlinkedDir = dev->deletedDir = NULL;
5096 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
5099 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
5102 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
5103 YAFFS_ROOT_MODE | S_IFDIR);
5104 dev->lostNFoundDir =
5105 yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
5106 YAFFS_LOSTNFOUND_MODE | S_IFDIR);
5108 if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
5109 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
5116 int yaffs_GutsInitialise(yaffs_Device *dev)
5118 int init_failed = 0;
5122 T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
5124 /* Check stuff that must be set */
5127 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
5131 dev->internalStartBlock = dev->param.startBlock;
5132 dev->internalEndBlock = dev->param.endBlock;
5133 dev->blockOffset = 0;
5134 dev->chunkOffset = 0;
5135 dev->nFreeChunks = 0;
5139 if (dev->param.startBlock == 0) {
5140 dev->internalStartBlock = dev->param.startBlock + 1;
5141 dev->internalEndBlock = dev->param.endBlock + 1;
5142 dev->blockOffset = 1;
5143 dev->chunkOffset = dev->param.nChunksPerBlock;
5146 /* Check geometry parameters. */
5148 if ((!dev->param.inbandTags && dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 1024) ||
5149 (!dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 512) ||
5150 (dev->param.inbandTags && !dev->param.isYaffs2) ||
5151 dev->param.nChunksPerBlock < 2 ||
5152 dev->param.nReservedBlocks < 2 ||
5153 dev->internalStartBlock <= 0 ||
5154 dev->internalEndBlock <= 0 ||
5155 dev->internalEndBlock <= (dev->internalStartBlock + dev->param.nReservedBlocks + 2)) { /* otherwise it is too small */
5156 T(YAFFS_TRACE_ALWAYS,
5158 ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
5159 TENDSTR), dev->param.totalBytesPerChunk, dev->param.isYaffs2 ? "2" : "", dev->param.inbandTags));
5163 if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
5164 T(YAFFS_TRACE_ALWAYS,
5165 (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
5169 /* Sort out space for inband tags, if required */
5170 if (dev->param.inbandTags)
5171 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
5173 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk;
5175 /* Got the right mix of functions? */
5176 if (!yaffs_CheckDevFunctions(dev)) {
5177 /* Function missing */
5178 T(YAFFS_TRACE_ALWAYS,
5180 ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
5185 /* This is really a compilation check. */
5186 if (!yaffs_CheckStructures()) {
5187 T(YAFFS_TRACE_ALWAYS,
5188 (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
5192 if (dev->isMounted) {
5193 T(YAFFS_TRACE_ALWAYS,
5194 (TSTR("yaffs: device already mounted\n" TENDSTR)));
5198 /* Finished with most checks. One or two more checks happen later on too. */
5202 /* OK now calculate a few things for the device */
5205 * Calculate all the chunk size manipulation numbers:
5207 x = dev->nDataBytesPerChunk;
5208 /* We always use dev->chunkShift and dev->chunkDiv */
5209 dev->chunkShift = Shifts(x);
5210 x >>= dev->chunkShift;
5212 /* We only use chunk mask if chunkDiv is 1 */
5213 dev->chunkMask = (1<<dev->chunkShift) - 1;
5216 * Calculate chunkGroupBits.
5217 * We need to find the next power of 2 > than internalEndBlock
5220 x = dev->param.nChunksPerBlock * (dev->internalEndBlock + 1);
5224 /* Set up tnode width if wide tnodes are enabled. */
5225 if (!dev->param.wideTnodesDisabled) {
5226 /* bits must be even so that we end up with 32-bit words */
5230 dev->tnodeWidth = 16;
5232 dev->tnodeWidth = bits;
5234 dev->tnodeWidth = 16;
5236 dev->tnodeMask = (1<<dev->tnodeWidth)-1;
5238 /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
5239 * so if the bitwidth of the
5240 * chunk range we're using is greater than 16 we need
5241 * to figure out chunk shift and chunkGroupSize
5244 if (bits <= dev->tnodeWidth)
5245 dev->chunkGroupBits = 0;
5247 dev->chunkGroupBits = bits - dev->tnodeWidth;
5249 dev->tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
5250 if(dev->tnodeSize < sizeof(yaffs_Tnode))
5251 dev->tnodeSize = sizeof(yaffs_Tnode);
5253 dev->chunkGroupSize = 1 << dev->chunkGroupBits;
5255 if (dev->param.nChunksPerBlock < dev->chunkGroupSize) {
5256 /* We have a problem because the soft delete won't work if
5257 * the chunk group size > chunks per block.
5258 * This can be remedied by using larger "virtual blocks".
5260 T(YAFFS_TRACE_ALWAYS,
5261 (TSTR("yaffs: chunk group too large\n" TENDSTR)));
5266 /* OK, we've finished verifying the device, lets continue with initialisation */
5268 /* More device initialisation */
5270 dev->passiveGCs = 0;
5271 dev->oldestDirtyGCs = 0;
5272 dev->backgroundGCs = 0;
5273 dev->gcBlockFinder = 0;
5274 dev->bufferedBlock = -1;
5275 dev->doingBufferedBlockRewrite = 0;
5276 dev->nDeletedFiles = 0;
5277 dev->nBackgroundDeletions = 0;
5278 dev->nUnlinkedFiles = 0;
5280 dev->eccUnfixed = 0;
5281 dev->tagsEccFixed = 0;
5282 dev->tagsEccUnfixed = 0;
5283 dev->nErasureFailures = 0;
5284 dev->nErasedBlocks = 0;
5286 dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
5287 YINIT_LIST_HEAD(&dev->dirtyDirectories);
5288 dev->oldestDirtySequence = 0;
5289 dev->oldestDirtyBlock = 0;
5291 /* Initialise temporary buffers and caches. */
5292 if (!yaffs_InitialiseTempBuffers(dev))
5295 dev->srCache = NULL;
5296 dev->gcCleanupList = NULL;
5300 dev->param.nShortOpCaches > 0) {
5303 int srCacheBytes = dev->param.nShortOpCaches * sizeof(yaffs_ChunkCache);
5305 if (dev->param.nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
5306 dev->param.nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
5308 dev->srCache = YMALLOC(srCacheBytes);
5310 buf = (__u8 *) dev->srCache;
5313 memset(dev->srCache, 0, srCacheBytes);
5315 for (i = 0; i < dev->param.nShortOpCaches && buf; i++) {
5316 dev->srCache[i].object = NULL;
5317 dev->srCache[i].lastUse = 0;
5318 dev->srCache[i].dirty = 0;
5319 dev->srCache[i].data = buf = YMALLOC_DMA(dev->param.totalBytesPerChunk);
5330 dev->gcCleanupList = YMALLOC(dev->param.nChunksPerBlock * sizeof(__u32));
5331 if (!dev->gcCleanupList)
5335 if (dev->param.isYaffs2)
5336 dev->param.useHeaderFileSize = 1;
5338 if (!init_failed && !yaffs_InitialiseBlocks(dev))
5341 yaffs_InitialiseTnodesAndObjects(dev);
5343 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
5348 /* Now scan the flash. */
5349 if (dev->param.isYaffs2) {
5350 if (yaffs2_CheckpointRestore(dev)) {
5351 yaffs_CheckObjectDetailsLoaded(dev->rootDir);
5352 T(YAFFS_TRACE_ALWAYS,
5353 (TSTR("yaffs: restored from checkpoint" TENDSTR)));
5356 /* Clean up the mess caused by an aborted checkpoint load
5357 * and scan backwards.
5359 yaffs_DeinitialiseBlocks(dev);
5361 yaffs_DeinitialiseTnodesAndObjects(dev);
5363 dev->nErasedBlocks = 0;
5364 dev->nFreeChunks = 0;
5365 dev->allocationBlock = -1;
5366 dev->allocationPage = -1;
5367 dev->nDeletedFiles = 0;
5368 dev->nUnlinkedFiles = 0;
5369 dev->nBackgroundDeletions = 0;
5371 if (!init_failed && !yaffs_InitialiseBlocks(dev))
5374 yaffs_InitialiseTnodesAndObjects(dev);
5376 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
5379 if (!init_failed && !yaffs2_ScanBackwards(dev))
5382 } else if (!yaffs1_Scan(dev))
5385 yaffs_StripDeletedObjects(dev);
5386 yaffs_FixHangingObjects(dev);
5387 if(dev->param.emptyLostAndFound)
5388 yaffs_EmptyLostAndFound(dev);
5392 /* Clean up the mess */
5393 T(YAFFS_TRACE_TRACING,
5394 (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
5396 yaffs_Deinitialise(dev);
5400 /* Zero out stats */
5401 dev->nPageReads = 0;
5402 dev->nPageWrites = 0;
5403 dev->nBlockErasures = 0;
5405 dev->nRetriedWrites = 0;
5407 dev->nRetiredBlocks = 0;
5409 yaffs_VerifyFreeChunks(dev);
5410 yaffs_VerifyBlocks(dev);
5412 /* Clean up any aborted checkpoint data */
5413 if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
5414 yaffs2_InvalidateCheckpoint(dev);
5416 T(YAFFS_TRACE_TRACING,
5417 (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
5422 void yaffs_Deinitialise(yaffs_Device *dev)
5424 if (dev->isMounted) {
5427 yaffs_DeinitialiseBlocks(dev);
5428 yaffs_DeinitialiseTnodesAndObjects(dev);
5429 if (dev->param.nShortOpCaches > 0 &&
5432 for (i = 0; i < dev->param.nShortOpCaches; i++) {
5433 if (dev->srCache[i].data)
5434 YFREE(dev->srCache[i].data);
5435 dev->srCache[i].data = NULL;
5438 YFREE(dev->srCache);
5439 dev->srCache = NULL;
5442 YFREE(dev->gcCleanupList);
5444 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
5445 YFREE(dev->tempBuffer[i].buffer);
5449 if (dev->param.deinitialiseNAND)
5450 dev->param.deinitialiseNAND(dev);
5454 int yaffs_CountFreeChunks(yaffs_Device *dev)
5459 yaffs_BlockInfo *blk;
5461 blk = dev->blockInfo;
5462 for (b = dev->internalStartBlock; b <= dev->internalEndBlock; b++) {
5463 switch (blk->blockState) {
5464 case YAFFS_BLOCK_STATE_EMPTY:
5465 case YAFFS_BLOCK_STATE_ALLOCATING:
5466 case YAFFS_BLOCK_STATE_COLLECTING:
5467 case YAFFS_BLOCK_STATE_FULL:
5469 (dev->param.nChunksPerBlock - blk->pagesInUse +
5470 blk->softDeletions);
5481 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
5483 /* This is what we report to the outside world */
5486 int nDirtyCacheChunks;
5487 int blocksForCheckpoint;
5491 nFree = dev->nFreeChunks;
5493 nFree = yaffs_CountFreeChunks(dev);
5496 nFree += dev->nDeletedFiles;
5498 /* Now count the number of dirty chunks in the cache and subtract those */
5500 for (nDirtyCacheChunks = 0, i = 0; i < dev->param.nShortOpCaches; i++) {
5501 if (dev->srCache[i].dirty)
5502 nDirtyCacheChunks++;
5505 nFree -= nDirtyCacheChunks;
5507 nFree -= ((dev->param.nReservedBlocks + 1) * dev->param.nChunksPerBlock);
5509 /* Now we figure out how much to reserve for the checkpoint and report that... */
5510 blocksForCheckpoint = yaffs2_CalcCheckpointBlocksRequired(dev);
5512 nFree -= (blocksForCheckpoint * dev->param.nChunksPerBlock);
5522 /*---------------------------------------- YAFFS test code ----------------------*/
5524 #define yaffs_CheckStruct(structure, syze, name) \
5526 if (sizeof(structure) != syze) { \
5527 T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
5528 name, syze, (int) sizeof(structure))); \
5529 return YAFFS_FAIL; \
5533 static int yaffs_CheckStructures(void)
5535 /* yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
5536 /* yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
5537 /* yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
5538 /* yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode"); */
5540 #ifndef CONFIG_YAFFS_WINCE
5541 yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");