yaffs_guts.c

   1 /*
   2  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2007 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Charles Manning <charles@aleph1.co.uk>
   8  *
   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.
  12  */
  13
  14 const char *yaffs_guts_c_version =
  15     "$Id: yaffs_guts.c,v 1.120 2010-03-15 23:10:34 charles Exp $";
  16
  17 #include "yportenv.h"
  18 #include "yaffs_trace.h"
  19
  20 #include "yaffsinterface.h"
  21 #include "yaffs_guts.h"
  22 #include "yaffs_tagsvalidity.h"
  23 #include "yaffs_getblockinfo.h"
  24
  25 #include "yaffs_tagscompat.h"
  26 #ifndef CONFIG_YAFFS_USE_OWN_SORT
  27 #include "yaffs_qsort.h"
  28 #endif
  29 #include "yaffs_nand.h"
  30
  31 #include "yaffs_checkptrw.h"
  32
  33 #include "yaffs_nand.h"
  34 #include "yaffs_packedtags2.h"
  35
  36
  37 /* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
  38 #define YAFFS_GC_GOOD_ENOUGH 2
  39 #define YAFFS_GC_PASSIVE_THRESHOLD 4
  40 #define YAFFS_SMALL_HOLE_THRESHOLD 3
  41
  42 #include "yaffs_ecc.h"
  43
  44
  45 /* Robustification (if it ever comes about...) */
  46 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND);
  47 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
  48                 int erasedOk);
  49 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
  50                                 const __u8 *data,
  51                                 const yaffs_ExtendedTags *tags);
  52 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
  53                                 const yaffs_ExtendedTags *tags);
  54
  55 /* Other local prototypes */
  56 static void yaffs_UpdateParent(yaffs_Object *obj);
  57 static int yaffs_UnlinkObject(yaffs_Object *obj);
  58 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
  59
  60 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
  61
  62 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev,
  63                                         const __u8 *buffer,
  64                                         yaffs_ExtendedTags *tags,
  65                                         int useReserve);
  66 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
  67                                 int chunkInNAND, int inScan);
  68
  69 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
  70                                         yaffs_ObjectType type);
  71 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
  72                                 yaffs_Object *obj);
  73 static int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name,
  74                                 int force, int isShrink, int shadows);
  75 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
  76 static int yaffs_CheckStructures(void);
  77 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
  78                         int chunkOffset, int *limit);
  79 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
  80
  81 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev, int blockNo);
  82
  83
  84 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
  85                                 int chunkInNAND);
  86
  87 static int yaffs_UnlinkWorker(yaffs_Object *obj);
  88
  89 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
  90                         int chunkInObject);
  91
  92 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
  93                                 yaffs_BlockInfo **blockUsedPtr);
  94
  95 static void yaffs_VerifyFreeChunks(yaffs_Device *dev);
  96
  97 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
  98
  99 static void yaffs_VerifyDirectory(yaffs_Object *directory);
 100 #ifdef YAFFS_PARANOID
 101 static int yaffs_CheckFileSanity(yaffs_Object *in);
 102 #else
 103 #define yaffs_CheckFileSanity(in)
 104 #endif
 105
 106 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
 107 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
 108
 109 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
 110
 111 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
 112                                 yaffs_ExtendedTags *tags);
 113
 114 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
 115                 unsigned pos);
 116 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
 117                                         yaffs_FileStructure *fStruct,
 118                                         __u32 chunkId);
 119
 120 static int yaffs_HandleHole(yaffs_Object *obj, loff_t newSize);
 121 static void yaffs_SkipRestOfBlock(yaffs_Device *dev);
 122 static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
 123                                         int chunkInNAND,
 124                                         const __u8 *data,
 125                                         yaffs_ExtendedTags *tags);
 126
 127 /* Function to calculate chunk and offset */
 128
 129 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut,
 130                 __u32 *offsetOut)
 131 {
 132         int chunk;
 133         __u32 offset;
 134
 135         chunk  = (__u32)(addr >> dev->chunkShift);
 136
 137         if (dev->chunkDiv == 1) {
 138                 /* easy power of 2 case */
 139                 offset = (__u32)(addr & dev->chunkMask);
 140         } else {
 141                 /* Non power-of-2 case */
 142
 143                 loff_t chunkBase;
 144
 145                 chunk /= dev->chunkDiv;
 146
 147                 chunkBase = ((loff_t)chunk) * dev->nDataBytesPerChunk;
 148                 offset = (__u32)(addr - chunkBase);
 149         }
 150
 151         *chunkOut = chunk;
 152         *offsetOut = offset;
 153 }
 154
 155 /* Function to return the number of shifts for a power of 2 greater than or
 156  * equal to the given number
 157  * Note we don't try to cater for all possible numbers and this does not have to
 158  * be hellishly efficient.
 159  */
 160
 161 static __u32 ShiftsGE(__u32 x)
 162 {
 163         int extraBits;
 164         int nShifts;
 165
 166         nShifts = extraBits = 0;
 167
 168         while (x > 1) {
 169                 if (x & 1)
 170                         extraBits++;
 171                 x >>= 1;
 172                 nShifts++;
 173         }
 174
 175         if (extraBits)
 176                 nShifts++;
 177
 178         return nShifts;
 179 }
 180
 181 /* Function to return the number of shifts to get a 1 in bit 0
 182  */
 183
 184 static __u32 Shifts(__u32 x)
 185 {
 186         int nShifts;
 187
 188         nShifts =  0;
 189
 190         if (!x)
 191                 return 0;
 192
 193         while (!(x&1)) {
 194                 x >>= 1;
 195                 nShifts++;
 196         }
 197
 198         return nShifts;
 199 }
 200
 201
 202
 203 /*
 204  * Temporary buffer manipulations.
 205  */
 206
 207 static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
 208 {
 209         int i;
 210         __u8 *buf = (__u8 *)1;
 211
 212         memset(dev->tempBuffer, 0, sizeof(dev->tempBuffer));
 213
 214         for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
 215                 dev->tempBuffer[i].line = 0;    /* not in use */
 216                 dev->tempBuffer[i].buffer = buf =
 217                     YMALLOC_DMA(dev->param.totalBytesPerChunk);
 218         }
 219
 220         return buf ? YAFFS_OK : YAFFS_FAIL;
 221 }
 222
 223 __u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo)
 224 {
 225         int i, j;
 226
 227         dev->tempInUse++;
 228         if (dev->tempInUse > dev->maxTemp)
 229                 dev->maxTemp = dev->tempInUse;
 230
 231         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 232                 if (dev->tempBuffer[i].line == 0) {
 233                         dev->tempBuffer[i].line = lineNo;
 234                         if ((i + 1) > dev->maxTemp) {
 235                                 dev->maxTemp = i + 1;
 236                                 for (j = 0; j <= i; j++)
 237                                         dev->tempBuffer[j].maxLine =
 238                                             dev->tempBuffer[j].line;
 239                         }
 240
 241                         return dev->tempBuffer[i].buffer;
 242                 }
 243         }
 244
 245         T(YAFFS_TRACE_BUFFERS,
 246           (TSTR("Out of temp buffers at line %d, other held by lines:"),
 247            lineNo));
 248         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
 249                 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
 250
 251         T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
 252
 253         /*
 254          * If we got here then we have to allocate an unmanaged one
 255          * This is not good.
 256          */
 257
 258         dev->unmanagedTempAllocations++;
 259         return YMALLOC(dev->nDataBytesPerChunk);
 260
 261 }
 262
 263 void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer,
 264                                     int lineNo)
 265 {
 266         int i;
 267
 268         dev->tempInUse--;
 269
 270         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 271                 if (dev->tempBuffer[i].buffer == buffer) {
 272                         dev->tempBuffer[i].line = 0;
 273                         return;
 274                 }
 275         }
 276
 277         if (buffer) {
 278                 /* assume it is an unmanaged one. */
 279                 T(YAFFS_TRACE_BUFFERS,
 280                   (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
 281                    lineNo));
 282                 YFREE(buffer);
 283                 dev->unmanagedTempDeallocations++;
 284         }
 285
 286 }
 287
 288 /*
 289  * Determine if we have a managed buffer.
 290  */
 291 int yaffs_IsManagedTempBuffer(yaffs_Device *dev, const __u8 *buffer)
 292 {
 293         int i;
 294
 295         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 296                 if (dev->tempBuffer[i].buffer == buffer)
 297                         return 1;
 298         }
 299
 300         for (i = 0; i < dev->param.nShortOpCaches; i++) {
 301                 if (dev->srCache[i].data == buffer)
 302                         return 1;
 303         }
 304
 305         if (buffer == dev->checkpointBuffer)
 306                 return 1;
 307
 308         T(YAFFS_TRACE_ALWAYS,
 309                 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
 310         return 0;
 311 }
 312
 313
 314
 315 /*
 316  * Chunk bitmap manipulations
 317  */
 318
 319 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
 320 {
 321         if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
 322                 T(YAFFS_TRACE_ERROR,
 323                         (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
 324                         blk));
 325                 YBUG();
 326         }
 327         return dev->chunkBits +
 328                 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
 329 }
 330
 331 static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
 332 {
 333         if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
 334                         chunk < 0 || chunk >= dev->param.nChunksPerBlock) {
 335                 T(YAFFS_TRACE_ERROR,
 336                 (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
 337                         blk, chunk));
 338                 YBUG();
 339         }
 340 }
 341
 342 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
 343 {
 344         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 345
 346         memset(blkBits, 0, dev->chunkBitmapStride);
 347 }
 348
 349 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk)
 350 {
 351         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 352
 353         yaffs_VerifyChunkBitId(dev, blk, chunk);
 354
 355         blkBits[chunk / 8] &= ~(1 << (chunk & 7));
 356 }
 357
 358 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk)
 359 {
 360         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 361
 362         yaffs_VerifyChunkBitId(dev, blk, chunk);
 363
 364         blkBits[chunk / 8] |= (1 << (chunk & 7));
 365 }
 366
 367 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk)
 368 {
 369         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 370         yaffs_VerifyChunkBitId(dev, blk, chunk);
 371
 372         return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
 373 }
 374
 375 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk)
 376 {
 377         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 378         int i;
 379         for (i = 0; i < dev->chunkBitmapStride; i++) {
 380                 if (*blkBits)
 381                         return 1;
 382                 blkBits++;
 383         }
 384         return 0;
 385 }
 386
 387 static int yaffs_CountChunkBits(yaffs_Device *dev, int blk)
 388 {
 389         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 390         int i;
 391         int n = 0;
 392         for (i = 0; i < dev->chunkBitmapStride; i++) {
 393                 __u8 x = *blkBits;
 394                 while (x) {
 395                         if (x & 1)
 396                                 n++;
 397                         x >>= 1;
 398                 }
 399
 400                 blkBits++;
 401         }
 402         return n;
 403 }
 404
 405 /*
 406  * Verification code
 407  */
 408
 409 static int yaffs_SkipVerification(yaffs_Device *dev)
 410 {
 411         dev=dev;
 412         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
 413 }
 414
 415 static int yaffs_SkipFullVerification(yaffs_Device *dev)
 416 {
 417         dev=dev;
 418         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
 419 }
 420
 421 static int yaffs_SkipNANDVerification(yaffs_Device *dev)
 422 {
 423         dev=dev;
 424         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
 425 }
 426
 427 static const char *blockStateName[] = {
 428 "Unknown",
 429 "Needs scanning",
 430 "Scanning",
 431 "Empty",
 432 "Allocating",
 433 "Full",
 434 "Dirty",
 435 "Checkpoint",
 436 "Collecting",
 437 "Dead"
 438 };
 439
 440 static void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
 441 {
 442         int actuallyUsed;
 443         int inUse;
 444
 445         if (yaffs_SkipVerification(dev))
 446                 return;
 447
 448         /* Report illegal runtime states */
 449         if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
 450                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState));
 451
 452         switch (bi->blockState) {
 453         case YAFFS_BLOCK_STATE_UNKNOWN:
 454         case YAFFS_BLOCK_STATE_SCANNING:
 455         case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
 456                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
 457                 n, blockStateName[bi->blockState]));
 458         }
 459
 460         /* Check pages in use and soft deletions are legal */
 461
 462         actuallyUsed = bi->pagesInUse - bi->softDeletions;
 463
 464         if (bi->pagesInUse < 0 || bi->pagesInUse > dev->param.nChunksPerBlock ||
 465            bi->softDeletions < 0 || bi->softDeletions > dev->param.nChunksPerBlock ||
 466            actuallyUsed < 0 || actuallyUsed > dev->param.nChunksPerBlock)
 467                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
 468                 n, bi->pagesInUse, bi->softDeletions));
 469
 470
 471         /* Check chunk bitmap legal */
 472         inUse = yaffs_CountChunkBits(dev, n);
 473         if (inUse != bi->pagesInUse)
 474                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
 475                         n, bi->pagesInUse, inUse));
 476
 477         /* Check that the sequence number is valid.
 478          * Ten million is legal, but is very unlikely
 479          */
 480         if (dev->param.isYaffs2 &&
 481            (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
 482            (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000))
 483                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has suspect sequence number of %d"TENDSTR),
 484                 n, bi->sequenceNumber));
 485 }
 486
 487 static void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi,
 488                 int n)
 489 {
 490         yaffs_VerifyBlock(dev, bi, n);
 491
 492         /* After collection the block should be in the erased state */
 493         /* This will need to change if we do partial gc */
 494
 495         if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
 496                         bi->blockState != YAFFS_BLOCK_STATE_EMPTY) {
 497                 T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
 498                         n, bi->blockState));
 499         }
 500 }
 501
 502 static void yaffs_VerifyBlocks(yaffs_Device *dev)
 503 {
 504         int i;
 505         int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
 506         int nIllegalBlockStates = 0;
 507
 508         if (yaffs_SkipVerification(dev))
 509                 return;
 510
 511         memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
 512
 513         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
 514                 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
 515                 yaffs_VerifyBlock(dev, bi, i);
 516
 517                 if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
 518                         nBlocksPerState[bi->blockState]++;
 519                 else
 520                         nIllegalBlockStates++;
 521         }
 522
 523         T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
 524         T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
 525
 526         T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
 527         if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
 528                 T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
 529
 530         for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
 531                 T(YAFFS_TRACE_VERIFY,
 532                   (TSTR("%s %d blocks"TENDSTR),
 533                   blockStateName[i], nBlocksPerState[i]));
 534
 535         if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
 536                 T(YAFFS_TRACE_VERIFY,
 537                  (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
 538                  dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
 539
 540         if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
 541                 T(YAFFS_TRACE_VERIFY,
 542                  (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
 543                  dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
 544
 545         if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
 546                 T(YAFFS_TRACE_VERIFY,
 547                  (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
 548                  nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
 549
 550         T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
 551
 552 }
 553
 554 /*
 555  * Verify the object header. oh must be valid, but obj and tags may be NULL in which
 556  * case those tests will not be performed.
 557  */
 558 static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
 559 {
 560         if (obj && yaffs_SkipVerification(obj->myDev))
 561                 return;
 562
 563         if (!(tags && obj && oh)) {
 564                 T(YAFFS_TRACE_VERIFY,
 565                                 (TSTR("Verifying object header tags %p obj %p oh %p"TENDSTR),
 566                                 tags, obj, oh));
 567                 return;
 568         }
 569
 570         if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
 571                         oh->type > YAFFS_OBJECT_TYPE_MAX)
 572                 T(YAFFS_TRACE_VERIFY,
 573                         (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
 574                         tags->objectId, oh->type));
 575
 576         if (tags->objectId != obj->objectId)
 577                 T(YAFFS_TRACE_VERIFY,
 578                         (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
 579                         tags->objectId, obj->objectId));
 580
 581
 582         /*
 583          * Check that the object's parent ids match if parentCheck requested.
 584          *
 585          * Tests do not apply to the root object.
 586          */
 587
 588         if (parentCheck && tags->objectId > 1 && !obj->parent)
 589                 T(YAFFS_TRACE_VERIFY,
 590                         (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
 591                         tags->objectId, oh->parentObjectId));
 592
 593         if (parentCheck && obj->parent &&
 594                         oh->parentObjectId != obj->parent->objectId &&
 595                         (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
 596                         obj->parent->objectId != YAFFS_OBJECTID_DELETED))
 597                 T(YAFFS_TRACE_VERIFY,
 598                         (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
 599                         tags->objectId, oh->parentObjectId, obj->parent->objectId));
 600
 601         if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */
 602                 T(YAFFS_TRACE_VERIFY,
 603                         (TSTR("Obj %d header name is NULL"TENDSTR),
 604                         obj->objectId));
 605
 606         if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
 607                 T(YAFFS_TRACE_VERIFY,
 608                         (TSTR("Obj %d header name is 0xFF"TENDSTR),
 609                         obj->objectId));
 610 }
 611
 612
 613
 614 static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
 615                                         __u32 level, int chunkOffset)
 616 {
 617         int i;
 618         yaffs_Device *dev = obj->myDev;
 619         int ok = 1;
 620
 621         if (tn) {
 622                 if (level > 0) {
 623
 624                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
 625                                 if (tn->internal[i]) {
 626                                         ok = yaffs_VerifyTnodeWorker(obj,
 627                                                         tn->internal[i],
 628                                                         level - 1,
 629                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
 630                                 }
 631                         }
 632                 } else if (level == 0) {
 633                         yaffs_ExtendedTags tags;
 634                         __u32 objectId = obj->objectId;
 635
 636                         chunkOffset <<=  YAFFS_TNODES_LEVEL0_BITS;
 637
 638                         for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
 639                                 __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
 640
 641                                 if (theChunk > 0) {
 642                                         /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
 643                                         yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
 644                                         if (tags.objectId != objectId || tags.chunkId != chunkOffset) {
 645                                                 T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
 646                                                         objectId, chunkOffset, theChunk,
 647                                                         tags.objectId, tags.chunkId));
 648                                         }
 649                                 }
 650                                 chunkOffset++;
 651                         }
 652                 }
 653         }
 654
 655         return ok;
 656
 657 }
 658
 659
 660 static void yaffs_VerifyFile(yaffs_Object *obj)
 661 {
 662         int requiredTallness;
 663         int actualTallness;
 664         __u32 lastChunk;
 665         __u32 x;
 666         __u32 i;
 667         yaffs_Device *dev;
 668         yaffs_ExtendedTags tags;
 669         yaffs_Tnode *tn;
 670         __u32 objectId;
 671
 672         if (!obj)
 673                 return;
 674
 675         if (yaffs_SkipVerification(obj->myDev))
 676                 return;
 677
 678         dev = obj->myDev;
 679         objectId = obj->objectId;
 680
 681         /* Check file size is consistent with tnode depth */
 682         lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
 683         x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
 684         requiredTallness = 0;
 685         while (x > 0) {
 686                 x >>= YAFFS_TNODES_INTERNAL_BITS;
 687                 requiredTallness++;
 688         }
 689
 690         actualTallness = obj->variant.fileVariant.topLevel;
 691
 692         /* Check that the chunks in the tnode tree are all correct.
 693          * We do this by scanning through the tnode tree and
 694          * checking the tags for every chunk match.
 695          */
 696
 697         if (yaffs_SkipNANDVerification(dev))
 698                 return;
 699
 700         for (i = 1; i <= lastChunk; i++) {
 701                 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i);
 702
 703                 if (tn) {
 704                         __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
 705                         if (theChunk > 0) {
 706                                 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
 707                                 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
 708                                 if (tags.objectId != objectId || tags.chunkId != i) {
 709                                         T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
 710                                                 objectId, i, theChunk,
 711                                                 tags.objectId, tags.chunkId));
 712                                 }
 713                         }
 714                 }
 715         }
 716 }
 717
 718
 719 static void yaffs_VerifyHardLink(yaffs_Object *obj)
 720 {
 721         if (obj && yaffs_SkipVerification(obj->myDev))
 722                 return;
 723
 724         /* Verify sane equivalent object */
 725 }
 726
 727 static void yaffs_VerifySymlink(yaffs_Object *obj)
 728 {
 729         if (obj && yaffs_SkipVerification(obj->myDev))
 730                 return;
 731
 732         /* Verify symlink string */
 733 }
 734
 735 static void yaffs_VerifySpecial(yaffs_Object *obj)
 736 {
 737         if (obj && yaffs_SkipVerification(obj->myDev))
 738                 return;
 739 }
 740
 741 static void yaffs_VerifyObject(yaffs_Object *obj)
 742 {
 743         yaffs_Device *dev;
 744
 745         __u32 chunkMin;
 746         __u32 chunkMax;
 747
 748         __u32 chunkIdOk;
 749         __u32 chunkInRange;
 750         __u32 chunkShouldNotBeDeleted;
 751         __u32 chunkValid;
 752
 753         if (!obj)
 754                 return;
 755
 756         if (obj->beingCreated)
 757                 return;
 758
 759         dev = obj->myDev;
 760
 761         if (yaffs_SkipVerification(dev))
 762                 return;
 763
 764         /* Check sane object header chunk */
 765
 766         chunkMin = dev->internalStartBlock * dev->param.nChunksPerBlock;
 767         chunkMax = (dev->internalEndBlock+1) * dev->param.nChunksPerBlock - 1;
 768
 769         chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
 770         chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
 771         chunkValid = chunkInRange &&
 772                         yaffs_CheckChunkBit(dev,
 773                                         obj->hdrChunk / dev->param.nChunksPerBlock,
 774                                         obj->hdrChunk % dev->param.nChunksPerBlock);
 775         chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
 776
 777         if (!obj->fake &&
 778                         (!chunkIdOk || chunkShouldNotBeDeleted)) {
 779                 T(YAFFS_TRACE_VERIFY,
 780                         (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
 781                         obj->objectId, obj->hdrChunk,
 782                         chunkIdOk ? "" : ",out of range",
 783                         chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
 784         }
 785
 786         if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
 787                 yaffs_ExtendedTags tags;
 788                 yaffs_ObjectHeader *oh;
 789                 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
 790
 791                 oh = (yaffs_ObjectHeader *)buffer;
 792
 793                 yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer,
 794                                 &tags);
 795
 796                 yaffs_VerifyObjectHeader(obj, oh, &tags, 1);
 797
 798                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
 799         }
 800
 801         /* Verify it has a parent */
 802         if (obj && !obj->fake &&
 803                         (!obj->parent || obj->parent->myDev != dev)) {
 804                 T(YAFFS_TRACE_VERIFY,
 805                         (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
 806                         obj->objectId, obj->parent));
 807         }
 808
 809         /* Verify parent is a directory */
 810         if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
 811                 T(YAFFS_TRACE_VERIFY,
 812                         (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
 813                         obj->objectId, obj->parent->variantType));
 814         }
 815
 816         switch (obj->variantType) {
 817         case YAFFS_OBJECT_TYPE_FILE:
 818                 yaffs_VerifyFile(obj);
 819                 break;
 820         case YAFFS_OBJECT_TYPE_SYMLINK:
 821                 yaffs_VerifySymlink(obj);
 822                 break;
 823         case YAFFS_OBJECT_TYPE_DIRECTORY:
 824                 yaffs_VerifyDirectory(obj);
 825                 break;
 826         case YAFFS_OBJECT_TYPE_HARDLINK:
 827                 yaffs_VerifyHardLink(obj);
 828                 break;
 829         case YAFFS_OBJECT_TYPE_SPECIAL:
 830                 yaffs_VerifySpecial(obj);
 831                 break;
 832         case YAFFS_OBJECT_TYPE_UNKNOWN:
 833         default:
 834                 T(YAFFS_TRACE_VERIFY,
 835                 (TSTR("Obj %d has illegaltype %d"TENDSTR),
 836                 obj->objectId, obj->variantType));
 837                 break;
 838         }
 839 }
 840
 841 static void yaffs_VerifyObjects(yaffs_Device *dev)
 842 {
 843         yaffs_Object *obj;
 844         int i;
 845         struct ylist_head *lh;
 846
 847         if (yaffs_SkipVerification(dev))
 848                 return;
 849
 850         /* Iterate through the objects in each hash entry */
 851
 852         for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
 853                 ylist_for_each(lh, &dev->objectBucket[i].list) {
 854                         if (lh) {
 855                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
 856                                 yaffs_VerifyObject(obj);
 857                         }
 858                 }
 859         }
 860 }
 861
 862
 863 /*
 864  *  Simple hash function. Needs to have a reasonable spread
 865  */
 866
 867 static Y_INLINE int yaffs_HashFunction(int n)
 868 {
 869         n = abs(n);
 870         return n % YAFFS_NOBJECT_BUCKETS;
 871 }
 872
 873 /*
 874  * Access functions to useful fake objects.
 875  * Note that root might have a presence in NAND if permissions are set.
 876  */
 877
 878 yaffs_Object *yaffs_Root(yaffs_Device *dev)
 879 {
 880         return dev->rootDir;
 881 }
 882
 883 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
 884 {
 885         return dev->lostNFoundDir;
 886 }
 887
 888
 889 /*
 890  *  Erased NAND checking functions
 891  */
 892
 893 int yaffs_CheckFF(__u8 *buffer, int nBytes)
 894 {
 895         /* Horrible, slow implementation */
 896         while (nBytes--) {
 897                 if (*buffer != 0xFF)
 898                         return 0;
 899                 buffer++;
 900         }
 901         return 1;
 902 }
 903
 904 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
 905                                 int chunkInNAND)
 906 {
 907         int retval = YAFFS_OK;
 908         __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
 909         yaffs_ExtendedTags tags;
 910         int result;
 911
 912         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
 913
 914         if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
 915                 retval = YAFFS_FAIL;
 916
 917         if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
 918                 T(YAFFS_TRACE_NANDACCESS,
 919                   (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
 920                 retval = YAFFS_FAIL;
 921         }
 922
 923         yaffs_ReleaseTempBuffer(dev, data, __LINE__);
 924
 925         return retval;
 926
 927 }
 928
 929
 930 static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
 931                                         int chunkInNAND,
 932                                         const __u8 *data,
 933                                         yaffs_ExtendedTags *tags)
 934 {
 935         int retval = YAFFS_OK;
 936         yaffs_ExtendedTags tempTags;
 937         __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
 938         int result;
 939
 940         result = yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,&tempTags);
 941         if(memcmp(buffer,data,dev->nDataBytesPerChunk) ||
 942                 tempTags.objectId != tags->objectId ||
 943                 tempTags.chunkId  != tags->chunkId ||
 944                 tempTags.byteCount != tags->byteCount)
 945                 retval = YAFFS_FAIL;
 946
 947         yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
 948
 949         return retval;
 950 }
 951
 952 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
 953                                         const __u8 *data,
 954                                         yaffs_ExtendedTags *tags,
 955                                         int useReserve)
 956 {
 957         int attempts = 0;
 958         int writeOk = 0;
 959         int chunk;
 960
 961         yaffs_InvalidateCheckpoint(dev);
 962
 963         do {
 964                 yaffs_BlockInfo *bi = 0;
 965                 int erasedOk = 0;
 966
 967                 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
 968                 if (chunk < 0) {
 969                         /* no space */
 970                         break;
 971                 }
 972
 973                 /* First check this chunk is erased, if it needs
 974                  * checking.  The checking policy (unless forced
 975                  * always on) is as follows:
 976                  *
 977                  * Check the first page we try to write in a block.
 978                  * If the check passes then we don't need to check any
 979                  * more.        If the check fails, we check again...
 980                  * If the block has been erased, we don't need to check.
 981                  *
 982                  * However, if the block has been prioritised for gc,
 983                  * then we think there might be something odd about
 984                  * this block and stop using it.
 985                  *
 986                  * Rationale: We should only ever see chunks that have
 987                  * not been erased if there was a partially written
 988                  * chunk due to power loss.  This checking policy should
 989                  * catch that case with very few checks and thus save a
 990                  * lot of checks that are most likely not needed.
 991                  *
 992                  * Mods to the above
 993                  * If an erase check fails or the write fails we skip the
 994                  * rest of the block.
 995                  */
 996
 997                 /* let's give it a try */
 998                 attempts++;
 999
1000 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
1001                 bi->skipErasedCheck = 0;
1002 #endif
1003                 if (!bi->skipErasedCheck) {
1004                         erasedOk = yaffs_CheckChunkErased(dev, chunk);
1005                         if (erasedOk != YAFFS_OK) {
1006                                 T(YAFFS_TRACE_ERROR,
1007                                 (TSTR("**>> yaffs chunk %d was not erased"
1008                                 TENDSTR), chunk));
1009
1010                                 /* If not erased, delete this one,
1011                                  * skip rest of block and
1012                                  * try another chunk */
1013                                  yaffs_DeleteChunk(dev,chunk,1,__LINE__);
1014                                  yaffs_SkipRestOfBlock(dev);
1015                                 continue;
1016                         }
1017                 }
1018
1019                 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
1020                                 data, tags);
1021
1022                 if(!bi->skipErasedCheck)
1023                         writeOk = yaffs_VerifyChunkWritten(dev, chunk, data, tags);
1024
1025                 if (writeOk != YAFFS_OK) {
1026                         /* Clean up aborted write, skip to next block and
1027                          * try another chunk */
1028                         yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
1029                         continue;
1030                 }
1031
1032                 bi->skipErasedCheck = 1;
1033
1034                 /* Copy the data into the robustification buffer */
1035                 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
1036
1037         } while (writeOk != YAFFS_OK &&
1038                 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
1039
1040         if (!writeOk)
1041                 chunk = -1;
1042
1043         if (attempts > 1) {
1044                 T(YAFFS_TRACE_ERROR,
1045                         (TSTR("**>> yaffs write required %d attempts" TENDSTR),
1046                         attempts));
1047
1048                 dev->nRetriedWrites += (attempts - 1);
1049         }
1050
1051         return chunk;
1052 }
1053
1054
1055 /*
1056  * Oldest Dirty Sequence Number handling.
1057  */
1058
1059 /* yaffs_CalcOldestDirtySequence()
1060  * yaffs_FindOldestDirtySequence()
1061  * Calculate the oldest dirty sequence number if we don't know it.
1062  */
1063 static void yaffs_CalcOldestDirtySequence(yaffs_Device *dev)
1064 {
1065         int i;
1066         unsigned seq;
1067         unsigned blockNo = 0;
1068         yaffs_BlockInfo *b;
1069
1070         if(!dev->param.isYaffs2)
1071                 return;
1072
1073         /* Find the oldest dirty sequence number. */
1074         seq = dev->sequenceNumber + 1;
1075         b = dev->blockInfo;
1076         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
1077                 if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
1078                         (b->pagesInUse - b->softDeletions) < dev->param.nChunksPerBlock &&
1079                         b->sequenceNumber < seq) {
1080                         seq = b->sequenceNumber;
1081                         blockNo = i;
1082                 }
1083                 b++;
1084         }
1085
1086         if(blockNo){
1087                 dev->oldestDirtySequence = seq;
1088                 dev->oldestDirtyBlock = blockNo;
1089         }
1090
1091 }
1092
1093
1094 static void yaffs_FindOldestDirtySequence(yaffs_Device *dev)
1095 {
1096         if(dev->param.isYaffs2 && !dev->oldestDirtySequence)
1097                 yaffs_CalcOldestDirtySequence(dev);
1098 }
1099
1100 /*
1101  * yaffs_ClearOldestDirtySequence()
1102  * Called when a block is erased or marked bad. (ie. when its sequenceNumber
1103  * becomes invalid). If the value matches the oldest then we clear
1104  * dev->oldestDirtySequence to force its recomputation.
1105  */
1106 static void yaffs_ClearOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi)
1107 {
1108
1109         if(!dev->param.isYaffs2)
1110                 return;
1111
1112         if(!bi || bi->sequenceNumber == dev->oldestDirtySequence){
1113                 dev->oldestDirtySequence = 0;
1114                 dev->oldestDirtyBlock = 0;
1115         }
1116 }
1117
1118 /*
1119  * yaffs_UpdateOldestDirtySequence()
1120  * Update the oldest dirty sequence number whenever we dirty a block.
1121  * Only do this if the oldestDirtySequence is actually being tracked.
1122  */
1123 static void yaffs_UpdateOldestDirtySequence(yaffs_Device *dev, unsigned blockNo, yaffs_BlockInfo *bi)
1124 {
1125         if(dev->param.isYaffs2 && dev->oldestDirtySequence){
1126                 if(dev->oldestDirtySequence > bi->sequenceNumber){
1127                         dev->oldestDirtySequence = bi->sequenceNumber;
1128                         dev->oldestDirtyBlock = blockNo;
1129                 }
1130         }
1131 }
1132
1133 /*
1134  * Block retiring for handling a broken block.
1135  */
1136
1137 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
1138 {
1139         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1140
1141         yaffs_InvalidateCheckpoint(dev);
1142
1143         yaffs_ClearOldestDirtySequence(dev,bi);
1144
1145         if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
1146                 if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
1147                         T(YAFFS_TRACE_ALWAYS, (TSTR(
1148                                 "yaffs: Failed to mark bad and erase block %d"
1149                                 TENDSTR), blockInNAND));
1150                 } else {
1151                         yaffs_ExtendedTags tags;
1152                         int chunkId = blockInNAND * dev->param.nChunksPerBlock;
1153
1154                         __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
1155
1156                         memset(buffer, 0xff, dev->nDataBytesPerChunk);
1157                         yaffs_InitialiseTags(&tags);
1158                         tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
1159                         if (dev->param.writeChunkWithTagsToNAND(dev, chunkId -
1160                                 dev->chunkOffset, buffer, &tags) != YAFFS_OK)
1161                                 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
1162                                         TCONT("write bad block marker to block %d")
1163                                         TENDSTR), blockInNAND));
1164
1165                         yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
1166                 }
1167         }
1168
1169         bi->blockState = YAFFS_BLOCK_STATE_DEAD;
1170         bi->gcPrioritise = 0;
1171         bi->needsRetiring = 0;
1172
1173         dev->nRetiredBlocks++;
1174 }
1175
1176 /*
1177  * Functions for robustisizing TODO
1178  *
1179  */
1180
1181 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
1182                                 const __u8 *data,
1183                                 const yaffs_ExtendedTags *tags)
1184 {
1185         dev=dev;
1186         chunkInNAND=chunkInNAND;
1187         data=data;
1188         tags=tags;
1189 }
1190
1191 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
1192                                 const yaffs_ExtendedTags *tags)
1193 {
1194         dev=dev;
1195         chunkInNAND=chunkInNAND;
1196         tags=tags;
1197 }
1198
1199 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1200 {
1201         if (!bi->gcPrioritise) {
1202                 bi->gcPrioritise = 1;
1203                 dev->hasPendingPrioritisedGCs = 1;
1204                 bi->chunkErrorStrikes++;
1205
1206                 if (bi->chunkErrorStrikes > 3) {
1207                         bi->needsRetiring = 1; /* Too many stikes, so retire this */
1208                         T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1209
1210                 }
1211         }
1212 }
1213
1214 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
1215                 int erasedOk)
1216 {
1217         int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock;
1218         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1219
1220         yaffs_HandleChunkError(dev, bi);
1221
1222         if (erasedOk) {
1223                 /* Was an actual write failure, so mark the block for retirement  */
1224                 bi->needsRetiring = 1;
1225                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1226                   (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1227         }
1228
1229         /* Delete the chunk */
1230         yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1231         yaffs_SkipRestOfBlock(dev);
1232 }
1233
1234
1235 /*---------------- Name handling functions ------------*/
1236
1237 static __u16 yaffs_CalcNameSum(const YCHAR *name)
1238 {
1239         __u16 sum = 0;
1240         __u16 i = 1;
1241
1242         const YUCHAR *bname = (const YUCHAR *) name;
1243         if (bname) {
1244                 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1245
1246 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1247                         sum += yaffs_toupper(*bname) * i;
1248 #else
1249                         sum += (*bname) * i;
1250 #endif
1251                         i++;
1252                         bname++;
1253                 }
1254         }
1255         return sum;
1256 }
1257
1258 static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
1259 {
1260 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1261         memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
1262         if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH)
1263                 yaffs_strcpy(obj->shortName, name);
1264         else
1265                 obj->shortName[0] = _Y('\0');
1266 #endif
1267         obj->sum = yaffs_CalcNameSum(name);
1268 }
1269
1270 /*-------------------- TNODES -------------------
1271
1272  * List of spare tnodes
1273  * The list is hooked together using the first pointer
1274  * in the tnode.
1275  */
1276
1277 /* yaffs_CreateTnodes creates a bunch more tnodes and
1278  * adds them to the tnode free list.
1279  * Don't use this function directly
1280  */
1281 static Y_INLINE int yaffs_CalcTnodeSize(yaffs_Device *dev)
1282 {
1283         int tnodeSize;
1284         /* Calculate the tnode size in bytes for variable width tnode support.
1285          * Must be a multiple of 32-bits  */
1286         tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1287
1288         if (tnodeSize < sizeof(yaffs_Tnode))
1289                 tnodeSize = sizeof(yaffs_Tnode);
1290         return tnodeSize;
1291 }
1292
1293 static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
1294 {
1295         int i;
1296         int tnodeSize = yaffs_CalcTnodeSize(dev);
1297         yaffs_Tnode *newTnodes;
1298         __u8 *mem;
1299         yaffs_Tnode *curr;
1300         yaffs_Tnode *next;
1301         yaffs_TnodeList *tnl;
1302
1303         if (nTnodes < 1)
1304                 return YAFFS_OK;
1305
1306
1307         /* make these things */
1308
1309         newTnodes = YMALLOC(nTnodes * tnodeSize);
1310         mem = (__u8 *)newTnodes;
1311
1312         if (!newTnodes) {
1313                 T(YAFFS_TRACE_ERROR,
1314                         (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1315                 return YAFFS_FAIL;
1316         }
1317
1318         /* Hook them into the free list */
1319 #if 0
1320         for (i = 0; i < nTnodes - 1; i++) {
1321                 newTnodes[i].internal[0] = &newTnodes[i + 1];
1322 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1323                 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1324 #endif
1325         }
1326
1327         newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1328 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1329         newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1330 #endif
1331         dev->freeTnodes = newTnodes;
1332 #else
1333         /* New hookup for wide tnodes */
1334         for (i = 0; i < nTnodes - 1; i++) {
1335                 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1336                 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1337                 curr->internal[0] = next;
1338         }
1339
1340         curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1341         curr->internal[0] = dev->freeTnodes;
1342         dev->freeTnodes = (yaffs_Tnode *)mem;
1343
1344 #endif
1345
1346
1347         dev->nFreeTnodes += nTnodes;
1348         dev->nTnodesCreated += nTnodes;
1349
1350         /* Now add this bunch of tnodes to a list for freeing up.
1351          * NB If we can't add this to the management list it isn't fatal
1352          * but it just means we can't free this bunch of tnodes later.
1353          */
1354
1355         tnl = YMALLOC(sizeof(yaffs_TnodeList));
1356         if (!tnl) {
1357                 T(YAFFS_TRACE_ERROR,
1358                   (TSTR
1359                    ("yaffs: Could not add tnodes to management list" TENDSTR)));
1360                    return YAFFS_FAIL;
1361         } else {
1362                 tnl->tnodes = newTnodes;
1363                 tnl->next = dev->allocatedTnodeList;
1364                 dev->allocatedTnodeList = tnl;
1365         }
1366
1367         T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1368
1369         return YAFFS_OK;
1370 }
1371
1372 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1373
1374 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device *dev)
1375 {
1376         yaffs_Tnode *tn = NULL;
1377
1378 #ifdef CONFIG_YAFFS_VALGRIND_TEST
1379         tn = YMALLOC(yaffs_CalcTnodeSize(dev));
1380         if(tn)
1381                 dev->nTnodesCreated++;
1382 #else
1383         /* If there are none left make more */
1384         if (!dev->freeTnodes)
1385                 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1386
1387         if (dev->freeTnodes) {
1388                 tn = dev->freeTnodes;
1389 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1390                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1391                         /* Hoosterman, this thing looks like it isn't in the list */
1392                         T(YAFFS_TRACE_ALWAYS,
1393                           (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1394                 }
1395 #endif
1396                 dev->freeTnodes = dev->freeTnodes->internal[0];
1397                 dev->nFreeTnodes--;
1398         }
1399 #endif
1400         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1401
1402         return tn;
1403 }
1404
1405 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
1406 {
1407         yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1408         int tnodeSize = yaffs_CalcTnodeSize(dev);
1409
1410         if (tn)
1411                 memset(tn, 0, tnodeSize);
1412
1413         return tn;
1414 }
1415
1416 /* FreeTnode frees up a tnode and puts it back on the free list */
1417 static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
1418 {
1419         if (tn) {
1420 #ifdef CONFIG_YAFFS_VALGRIND_TEST
1421                 YFREE(tn);
1422                 dev->nTnodesCreated--;
1423 #else
1424 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1425                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1426                         /* Hoosterman, this thing looks like it is already in the list */
1427                         T(YAFFS_TRACE_ALWAYS,
1428                           (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1429                 }
1430                 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1431 #endif
1432                 tn->internal[0] = dev->freeTnodes;
1433                 dev->freeTnodes = tn;
1434                 dev->nFreeTnodes++;
1435 #endif
1436         }
1437         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1438 }
1439
1440 static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
1441 {
1442         /* Free the list of allocated tnodes */
1443         yaffs_TnodeList *tmp;
1444
1445         while (dev->allocatedTnodeList) {
1446                 tmp = dev->allocatedTnodeList->next;
1447
1448                 YFREE(dev->allocatedTnodeList->tnodes);
1449                 YFREE(dev->allocatedTnodeList);
1450                 dev->allocatedTnodeList = tmp;
1451
1452         }
1453
1454         dev->freeTnodes = NULL;
1455         dev->nFreeTnodes = 0;
1456         dev->nTnodesCreated = 0;
1457 }
1458
1459 static void yaffs_InitialiseTnodes(yaffs_Device *dev)
1460 {
1461         dev->allocatedTnodeList = NULL;
1462         dev->freeTnodes = NULL;
1463         dev->nFreeTnodes = 0;
1464         dev->nTnodesCreated = 0;
1465 }
1466
1467
1468 void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
1469                 unsigned val)
1470 {
1471         __u32 *map = (__u32 *)tn;
1472         __u32 bitInMap;
1473         __u32 bitInWord;
1474         __u32 wordInMap;
1475         __u32 mask;
1476
1477         pos &= YAFFS_TNODES_LEVEL0_MASK;
1478         val >>= dev->chunkGroupBits;
1479
1480         bitInMap = pos * dev->tnodeWidth;
1481         wordInMap = bitInMap / 32;
1482         bitInWord = bitInMap & (32 - 1);
1483
1484         mask = dev->tnodeMask << bitInWord;
1485
1486         map[wordInMap] &= ~mask;
1487         map[wordInMap] |= (mask & (val << bitInWord));
1488
1489         if (dev->tnodeWidth > (32 - bitInWord)) {
1490                 bitInWord = (32 - bitInWord);
1491                 wordInMap++;;
1492                 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1493                 map[wordInMap] &= ~mask;
1494                 map[wordInMap] |= (mask & (val >> bitInWord));
1495         }
1496 }
1497
1498 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
1499                 unsigned pos)
1500 {
1501         __u32 *map = (__u32 *)tn;
1502         __u32 bitInMap;
1503         __u32 bitInWord;
1504         __u32 wordInMap;
1505         __u32 val;
1506
1507         pos &= YAFFS_TNODES_LEVEL0_MASK;
1508
1509         bitInMap = pos * dev->tnodeWidth;
1510         wordInMap = bitInMap / 32;
1511         bitInWord = bitInMap & (32 - 1);
1512
1513         val = map[wordInMap] >> bitInWord;
1514
1515         if      (dev->tnodeWidth > (32 - bitInWord)) {
1516                 bitInWord = (32 - bitInWord);
1517                 wordInMap++;;
1518                 val |= (map[wordInMap] << bitInWord);
1519         }
1520
1521         val &= dev->tnodeMask;
1522         val <<= dev->chunkGroupBits;
1523
1524         return val;
1525 }
1526
1527 /* ------------------- End of individual tnode manipulation -----------------*/
1528
1529 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1530  * The look up tree is represented by the top tnode and the number of topLevel
1531  * in the tree. 0 means only the level 0 tnode is in the tree.
1532  */
1533
1534 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1535 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
1536                                         yaffs_FileStructure *fStruct,
1537                                         __u32 chunkId)
1538 {
1539         yaffs_Tnode *tn = fStruct->top;
1540         __u32 i;
1541         int requiredTallness;
1542         int level = fStruct->topLevel;
1543
1544         dev=dev;
1545
1546         /* Check sane level and chunk Id */
1547         if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
1548                 return NULL;
1549
1550         if (chunkId > YAFFS_MAX_CHUNK_ID)
1551                 return NULL;
1552
1553         /* First check we're tall enough (ie enough topLevel) */
1554
1555         i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1556         requiredTallness = 0;
1557         while (i) {
1558                 i >>= YAFFS_TNODES_INTERNAL_BITS;
1559                 requiredTallness++;
1560         }
1561
1562         if (requiredTallness > fStruct->topLevel)
1563                 return NULL; /* Not tall enough, so we can't find it */
1564
1565         /* Traverse down to level 0 */
1566         while (level > 0 && tn) {
1567                 tn = tn->internal[(chunkId >>
1568                         (YAFFS_TNODES_LEVEL0_BITS +
1569                                 (level - 1) *
1570                                 YAFFS_TNODES_INTERNAL_BITS)) &
1571                         YAFFS_TNODES_INTERNAL_MASK];
1572                 level--;
1573         }
1574
1575         return tn;
1576 }
1577
1578 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1579  * This happens in two steps:
1580  *  1. If the tree isn't tall enough, then make it taller.
1581  *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1582  *
1583  * Used when modifying the tree.
1584  *
1585  *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1586  *  be plugged into the ttree.
1587  */
1588
1589 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
1590                                         yaffs_FileStructure *fStruct,
1591                                         __u32 chunkId,
1592                                         yaffs_Tnode *passedTn)
1593 {
1594         int requiredTallness;
1595         int i;
1596         int l;
1597         yaffs_Tnode *tn;
1598
1599         __u32 x;
1600
1601
1602         /* Check sane level and page Id */
1603         if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
1604                 return NULL;
1605
1606         if (chunkId > YAFFS_MAX_CHUNK_ID)
1607                 return NULL;
1608
1609         /* First check we're tall enough (ie enough topLevel) */
1610
1611         x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1612         requiredTallness = 0;
1613         while (x) {
1614                 x >>= YAFFS_TNODES_INTERNAL_BITS;
1615                 requiredTallness++;
1616         }
1617
1618
1619         if (requiredTallness > fStruct->topLevel) {
1620                 /* Not tall enough, gotta make the tree taller */
1621                 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1622
1623                         tn = yaffs_GetTnode(dev);
1624
1625                         if (tn) {
1626                                 tn->internal[0] = fStruct->top;
1627                                 fStruct->top = tn;
1628                                 fStruct->topLevel++;
1629                         } else {
1630                                 T(YAFFS_TRACE_ERROR,
1631                                         (TSTR("yaffs: no more tnodes" TENDSTR)));
1632                                 return NULL;
1633                         }
1634                 }
1635         }
1636
1637         /* Traverse down to level 0, adding anything we need */
1638
1639         l = fStruct->topLevel;
1640         tn = fStruct->top;
1641
1642         if (l > 0) {
1643                 while (l > 0 && tn) {
1644                         x = (chunkId >>
1645                              (YAFFS_TNODES_LEVEL0_BITS +
1646                               (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1647                             YAFFS_TNODES_INTERNAL_MASK;
1648
1649
1650                         if ((l > 1) && !tn->internal[x]) {
1651                                 /* Add missing non-level-zero tnode */
1652                                 tn->internal[x] = yaffs_GetTnode(dev);
1653                                 if(!tn->internal[x])
1654                                         return NULL;
1655                         } else if (l == 1) {
1656                                 /* Looking from level 1 at level 0 */
1657                                 if (passedTn) {
1658                                         /* If we already have one, then release it.*/
1659                                         if (tn->internal[x])
1660                                                 yaffs_FreeTnode(dev, tn->internal[x]);
1661                                         tn->internal[x] = passedTn;
1662
1663                                 } else if (!tn->internal[x]) {
1664                                         /* Don't have one, none passed in */
1665                                         tn->internal[x] = yaffs_GetTnode(dev);
1666                                         if(!tn->internal[x])
1667                                                 return NULL;
1668                                 }
1669                         }
1670
1671                         tn = tn->internal[x];
1672                         l--;
1673                 }
1674         } else {
1675                 /* top is level 0 */
1676                 if (passedTn) {
1677                         memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1678                         yaffs_FreeTnode(dev, passedTn);
1679                 }
1680         }
1681
1682         return tn;
1683 }
1684
1685 static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
1686                                 yaffs_ExtendedTags *tags, int objectId,
1687                                 int chunkInInode)
1688 {
1689         int j;
1690
1691         for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1692                 if (yaffs_CheckChunkBit(dev, theChunk / dev->param.nChunksPerBlock,
1693                                 theChunk % dev->param.nChunksPerBlock)) {
1694
1695                         if(dev->chunkGroupSize == 1)
1696                                 return theChunk;
1697                         else {
1698                                 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1699                                                                 tags);
1700                                 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1701                                         /* found it; */
1702                                         return theChunk;
1703                                 }
1704                         }
1705                 }
1706                 theChunk++;
1707         }
1708         return -1;
1709 }
1710
1711
1712 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1713  * chunks and tnodes in the file
1714  * Returns 1 if the tree was deleted.
1715  * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1716  */
1717
1718 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
1719                               int chunkOffset, int *limit)
1720 {
1721         int i;
1722         int chunkInInode;
1723         int theChunk;
1724         yaffs_ExtendedTags tags;
1725         int foundChunk;
1726         yaffs_Device *dev = in->myDev;
1727
1728         int allDone = 1;
1729
1730         if (tn) {
1731                 if (level > 0) {
1732                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1733                              i--) {
1734                                 if (tn->internal[i]) {
1735                                         if (limit && (*limit) < 0) {
1736                                                 allDone = 0;
1737                                         } else {
1738                                                 allDone =
1739                                                         yaffs_DeleteWorker(in,
1740                                                                 tn->
1741                                                                 internal
1742                                                                 [i],
1743                                                                 level -
1744                                                                 1,
1745                                                                 (chunkOffset
1746                                                                         <<
1747                                                                         YAFFS_TNODES_INTERNAL_BITS)
1748                                                                 + i,
1749                                                                 limit);
1750                                         }
1751                                         if (allDone) {
1752                                                 yaffs_FreeTnode(dev,
1753                                                                 tn->
1754                                                                 internal[i]);
1755                                                 tn->internal[i] = NULL;
1756                                         }
1757                                 }
1758                         }
1759                         return (allDone) ? 1 : 0;
1760                 } else if (level == 0) {
1761                         int hitLimit = 0;
1762
1763                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1764                                         i--) {
1765                                 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1766                                 if (theChunk) {
1767
1768                                         chunkInInode = (chunkOffset <<
1769                                                 YAFFS_TNODES_LEVEL0_BITS) + i;
1770
1771                                         foundChunk =
1772                                                 yaffs_FindChunkInGroup(dev,
1773                                                                 theChunk,
1774                                                                 &tags,
1775                                                                 in->objectId,
1776                                                                 chunkInInode);
1777
1778                                         if (foundChunk > 0) {
1779                                                 yaffs_DeleteChunk(dev,
1780                                                                   foundChunk, 1,
1781                                                                   __LINE__);
1782                                                 in->nDataChunks--;
1783                                                 if (limit) {
1784                                                         *limit = *limit - 1;
1785                                                         if (*limit <= 0)
1786                                                                 hitLimit = 1;
1787                                                 }
1788
1789                                         }
1790
1791                                         yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1792                                 }
1793
1794                         }
1795                         return (i < 0) ? 1 : 0;
1796
1797                 }
1798
1799         }
1800
1801         return 1;
1802
1803 }
1804
1805 static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
1806 {
1807         yaffs_BlockInfo *theBlock;
1808         unsigned blockNo;
1809
1810         T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1811
1812         blockNo =  chunk / dev->param.nChunksPerBlock;
1813         theBlock = yaffs_GetBlockInfo(dev, blockNo);
1814         if (theBlock) {
1815                 theBlock->softDeletions++;
1816                 dev->nFreeChunks++;
1817                 yaffs_UpdateOldestDirtySequence(dev, blockNo, theBlock);
1818         }
1819 }
1820
1821 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1822  * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1823  * of the tnode.
1824  * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1825  */
1826
1827 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
1828                                   __u32 level, int chunkOffset)
1829 {
1830         int i;
1831         int theChunk;
1832         int allDone = 1;
1833         yaffs_Device *dev = in->myDev;
1834
1835         if (tn) {
1836                 if (level > 0) {
1837
1838                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1839                              i--) {
1840                                 if (tn->internal[i]) {
1841                                         allDone =
1842                                             yaffs_SoftDeleteWorker(in,
1843                                                                    tn->
1844                                                                    internal[i],
1845                                                                    level - 1,
1846                                                                    (chunkOffset
1847                                                                     <<
1848                                                                     YAFFS_TNODES_INTERNAL_BITS)
1849                                                                    + i);
1850                                         if (allDone) {
1851                                                 yaffs_FreeTnode(dev,
1852                                                                 tn->
1853                                                                 internal[i]);
1854                                                 tn->internal[i] = NULL;
1855                                         } else {
1856                                                 /* Hoosterman... how could this happen? */
1857                                         }
1858                                 }
1859                         }
1860                         return (allDone) ? 1 : 0;
1861                 } else if (level == 0) {
1862
1863                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1864                                 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1865                                 if (theChunk) {
1866                                         /* Note this does not find the real chunk, only the chunk group.
1867                                          * We make an assumption that a chunk group is not larger than
1868                                          * a block.
1869                                          */
1870                                         yaffs_SoftDeleteChunk(dev, theChunk);
1871                                         yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1872                                 }
1873
1874                         }
1875                         return 1;
1876
1877                 }
1878
1879         }
1880
1881         return 1;
1882
1883 }
1884
1885 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1886 {
1887         if (obj->deleted &&
1888             obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1889                 if (obj->nDataChunks <= 0) {
1890                         /* Empty file with no duplicate object headers, just delete it immediately */
1891                         yaffs_FreeTnode(obj->myDev,
1892                                         obj->variant.fileVariant.top);
1893                         obj->variant.fileVariant.top = NULL;
1894                         T(YAFFS_TRACE_TRACING,
1895                           (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1896                            obj->objectId));
1897                         yaffs_DoGenericObjectDeletion(obj);
1898                 } else {
1899                         yaffs_SoftDeleteWorker(obj,
1900                                                obj->variant.fileVariant.top,
1901                                                obj->variant.fileVariant.
1902                                                topLevel, 0);
1903                         obj->softDeleted = 1;
1904                 }
1905         }
1906 }
1907
1908 /* Pruning removes any part of the file structure tree that is beyond the
1909  * bounds of the file (ie that does not point to chunks).
1910  *
1911  * A file should only get pruned when its size is reduced.
1912  *
1913  * Before pruning, the chunks must be pulled from the tree and the
1914  * level 0 tnode entries must be zeroed out.
1915  * Could also use this for file deletion, but that's probably better handled
1916  * by a special case.
1917  *
1918  * This function is recursive. For levels > 0 the function is called again on
1919  * any sub-tree. For level == 0 we just check if the sub-tree has data.
1920  * If there is no data in a subtree then it is pruned.
1921  */
1922
1923 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
1924                                 __u32 level, int del0)
1925 {
1926         int i;
1927         int hasData;
1928
1929         if (tn) {
1930                 hasData = 0;
1931
1932                 if(level > 0){
1933                         for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1934                                 if (tn->internal[i]) {
1935                                         tn->internal[i] =
1936                                                 yaffs_PruneWorker(dev, tn->internal[i],
1937                                                         level - 1,
1938                                                         (i == 0) ? del0 : 1);
1939                                 }
1940
1941                                 if (tn->internal[i])
1942                                         hasData++;
1943                         }
1944                 } else {
1945                         int tnodeSize_u32 = yaffs_CalcTnodeSize(dev)/sizeof(__u32);
1946                         __u32 *map = (__u32 *)tn;
1947
1948                         for(i = 0; !hasData && i < tnodeSize_u32; i++){
1949                                 if(map[i])
1950                                         hasData++;
1951                         }
1952                 }
1953
1954                 if (hasData == 0 && del0) {
1955                         /* Free and return NULL */
1956
1957                         yaffs_FreeTnode(dev, tn);
1958                         tn = NULL;
1959                 }
1960
1961         }
1962
1963         return tn;
1964
1965 }
1966
1967 static int yaffs_PruneFileStructure(yaffs_Device *dev,
1968                                 yaffs_FileStructure *fStruct)
1969 {
1970         int i;
1971         int hasData;
1972         int done = 0;
1973         yaffs_Tnode *tn;
1974
1975         if (fStruct->topLevel > 0) {
1976                 fStruct->top =
1977                     yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1978
1979                 /* Now we have a tree with all the non-zero branches NULL but the height
1980                  * is the same as it was.
1981                  * Let's see if we can trim internal tnodes to shorten the tree.
1982                  * We can do this if only the 0th element in the tnode is in use
1983                  * (ie all the non-zero are NULL)
1984                  */
1985
1986                 while (fStruct->topLevel && !done) {
1987                         tn = fStruct->top;
1988
1989                         hasData = 0;
1990                         for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1991                                 if (tn->internal[i])
1992                                         hasData++;
1993                         }
1994
1995                         if (!hasData) {
1996                                 fStruct->top = tn->internal[0];
1997                                 fStruct->topLevel--;
1998                                 yaffs_FreeTnode(dev, tn);
1999                         } else {
2000                                 done = 1;
2001                         }
2002                 }
2003         }
2004
2005         return YAFFS_OK;
2006 }
2007
2008 /*-------------------- End of File Structure functions.-------------------*/
2009
2010 /* yaffs_CreateFreeObjects creates a bunch more objects and
2011  * adds them to the object free list.
2012  */
2013 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
2014 {
2015         int i;
2016         yaffs_Object *newObjects;
2017         yaffs_ObjectList *list;
2018
2019         if (nObjects < 1)
2020                 return YAFFS_OK;
2021
2022         /* make these things */
2023         newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
2024         list = YMALLOC(sizeof(yaffs_ObjectList));
2025
2026         if (!newObjects || !list) {
2027                 if (newObjects){
2028                         YFREE(newObjects);
2029                         newObjects = NULL;
2030                 }
2031                 if (list){
2032                         YFREE(list);
2033                         list = NULL;
2034                 }
2035                 T(YAFFS_TRACE_ALLOCATE,
2036                   (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
2037                 return YAFFS_FAIL;
2038         }
2039
2040         /* Hook them into the free list */
2041         for (i = 0; i < nObjects - 1; i++) {
2042                 newObjects[i].siblings.next =
2043                                 (struct ylist_head *)(&newObjects[i + 1]);
2044         }
2045
2046         newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
2047         dev->freeObjects = newObjects;
2048         dev->nFreeObjects += nObjects;
2049         dev->nObjectsCreated += nObjects;
2050
2051         /* Now add this bunch of Objects to a list for freeing up. */
2052
2053         list->objects = newObjects;
2054         list->next = dev->allocatedObjectList;
2055         dev->allocatedObjectList = list;
2056
2057         return YAFFS_OK;
2058 }
2059
2060
2061 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
2062 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
2063 {
2064         yaffs_Object *tn = NULL;
2065
2066 #ifdef CONFIG_YAFFS_VALGRIND_TEST
2067         tn = YMALLOC(sizeof(yaffs_Object));
2068         if(tn)
2069                 dev->nObjectsCreated++;
2070 #else
2071         /* If there are none left make more */
2072         if (!dev->freeObjects)
2073                 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
2074
2075         if (dev->freeObjects) {
2076                 tn = dev->freeObjects;
2077                 dev->freeObjects =
2078                         (yaffs_Object *) (dev->freeObjects->siblings.next);
2079                 dev->nFreeObjects--;
2080         }
2081 #endif
2082         if (tn) {
2083                 /* Now sweeten it up... */
2084
2085                 memset(tn, 0, sizeof(yaffs_Object));
2086                 tn->beingCreated = 1;
2087
2088                 tn->myDev = dev;
2089                 tn->hdrChunk = 0;
2090                 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
2091                 YINIT_LIST_HEAD(&(tn->hardLinks));
2092                 YINIT_LIST_HEAD(&(tn->hashLink));
2093                 YINIT_LIST_HEAD(&tn->siblings);
2094
2095
2096                 /* Now make the directory sane */
2097                 if (dev->rootDir) {
2098                         tn->parent = dev->rootDir;
2099                         ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
2100                 }
2101
2102                 /* Add it to the lost and found directory.
2103                  * NB Can't put root or lostNFound in lostNFound so
2104                  * check if lostNFound exists first
2105                  */
2106                 if (dev->lostNFoundDir)
2107                         yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
2108
2109                 tn->beingCreated = 0;
2110         }
2111
2112         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2113
2114         return tn;
2115 }
2116
2117 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
2118                                                __u32 mode)
2119 {
2120
2121         yaffs_Object *obj =
2122             yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
2123         if (obj) {
2124                 obj->fake = 1;          /* it is fake so it might have no NAND presence... */
2125                 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
2126                 obj->unlinkAllowed = 0; /* ... or unlink it */
2127                 obj->deleted = 0;
2128                 obj->unlinked = 0;
2129                 obj->yst_mode = mode;
2130                 obj->myDev = dev;
2131                 obj->hdrChunk = 0;      /* Not a valid chunk. */
2132         }
2133
2134         return obj;
2135
2136 }
2137
2138 static void yaffs_UnhashObject(yaffs_Object *tn)
2139 {
2140         int bucket;
2141         yaffs_Device *dev = tn->myDev;
2142
2143         /* If it is still linked into the bucket list, free from the list */
2144         if (!ylist_empty(&tn->hashLink)) {
2145                 ylist_del_init(&tn->hashLink);
2146                 bucket = yaffs_HashFunction(tn->objectId);
2147                 dev->objectBucket[bucket].count--;
2148         }
2149 }
2150
2151 /*  FreeObject frees up a Object and puts it back on the free list */
2152 static void yaffs_FreeObject(yaffs_Object *tn)
2153 {
2154         yaffs_Device *dev = tn->myDev;
2155
2156         T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
2157
2158         if (!tn)
2159                 YBUG();
2160         if (tn->parent)
2161                 YBUG();
2162         if (!ylist_empty(&tn->siblings))
2163                 YBUG();
2164
2165
2166         if (tn->myInode) {
2167                 /* We're still hooked up to a cached inode.
2168                  * Don't delete now, but mark for later deletion
2169                  */
2170                 tn->deferedFree = 1;
2171                 return;
2172         }
2173
2174         yaffs_UnhashObject(tn);
2175
2176 #ifdef CONFIG_YAFFS_VALGRIND_TEST
2177         YFREE(tn);
2178         dev->nObjectsCreated--;
2179         tn = NULL;
2180 #else
2181         /* Link into the free list. */
2182         tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
2183         dev->freeObjects = tn;
2184         dev->nFreeObjects++;
2185 #endif
2186         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2187 }
2188
2189
2190 void yaffs_HandleDeferedFree(yaffs_Object *obj)
2191 {
2192         if (obj->deferedFree)
2193                 yaffs_FreeObject(obj);
2194 }
2195
2196
2197 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
2198 {
2199         /* Free the list of allocated Objects */
2200
2201         yaffs_ObjectList *tmp;
2202
2203         while (dev->allocatedObjectList) {
2204                 tmp = dev->allocatedObjectList->next;
2205                 YFREE(dev->allocatedObjectList->objects);
2206                 YFREE(dev->allocatedObjectList);
2207
2208                 dev->allocatedObjectList = tmp;
2209         }
2210
2211         dev->freeObjects = NULL;
2212         dev->nFreeObjects = 0;
2213         dev->nObjectsCreated = 0;
2214 }
2215
2216 static void yaffs_InitialiseObjects(yaffs_Device *dev)
2217 {
2218         int i;
2219
2220         dev->allocatedObjectList = NULL;
2221         dev->freeObjects = NULL;
2222         dev->nFreeObjects = 0;
2223
2224         for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2225                 YINIT_LIST_HEAD(&dev->objectBucket[i].list);
2226                 dev->objectBucket[i].count = 0;
2227         }
2228 }
2229
2230 static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
2231 {
2232         int i;
2233         int l = 999;
2234         int lowest = 999999;
2235
2236
2237         /* Search for the shortest list or one that
2238          * isn't too long.
2239          */
2240
2241         for (i = 0; i < 10 && lowest > 4; i++) {
2242                 dev->bucketFinder++;
2243                 dev->bucketFinder %= YAFFS_NOBJECT_BUCKETS;
2244                 if (dev->objectBucket[dev->bucketFinder].count < lowest) {
2245                         lowest = dev->objectBucket[dev->bucketFinder].count;
2246                         l = dev->bucketFinder;
2247                 }
2248
2249         }
2250
2251         return l;
2252 }
2253
2254 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
2255 {
2256         int bucket = yaffs_FindNiceObjectBucket(dev);
2257
2258         /* Now find an object value that has not already been taken
2259          * by scanning the list.
2260          */
2261
2262         int found = 0;
2263         struct ylist_head *i;
2264
2265         __u32 n = (__u32) bucket;
2266
2267         /* yaffs_CheckObjectHashSanity();  */
2268
2269         while (!found) {
2270                 found = 1;
2271                 n += YAFFS_NOBJECT_BUCKETS;
2272                 if (1 || dev->objectBucket[bucket].count > 0) {
2273                         ylist_for_each(i, &dev->objectBucket[bucket].list) {
2274                                 /* If there is already one in the list */
2275                                 if (i && ylist_entry(i, yaffs_Object,
2276                                                 hashLink)->objectId == n) {
2277                                         found = 0;
2278                                 }
2279                         }
2280                 }
2281         }
2282
2283         return n;
2284 }
2285
2286 static void yaffs_HashObject(yaffs_Object *in)
2287 {
2288         int bucket = yaffs_HashFunction(in->objectId);
2289         yaffs_Device *dev = in->myDev;
2290
2291         ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
2292         dev->objectBucket[bucket].count++;
2293 }
2294
2295 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
2296 {
2297         int bucket = yaffs_HashFunction(number);
2298         struct ylist_head *i;
2299         yaffs_Object *in;
2300
2301         ylist_for_each(i, &dev->objectBucket[bucket].list) {
2302                 /* Look if it is in the list */
2303                 if (i) {
2304                         in = ylist_entry(i, yaffs_Object, hashLink);
2305                         if (in->objectId == number) {
2306
2307                                 /* Don't tell the VFS about this one if it is defered free */
2308                                 if (in->deferedFree)
2309                                         return NULL;
2310
2311                                 return in;
2312                         }
2313                 }
2314         }
2315
2316         return NULL;
2317 }
2318
2319 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
2320                                     yaffs_ObjectType type)
2321 {
2322         yaffs_Object *theObject=NULL;
2323         yaffs_Tnode *tn = NULL;
2324
2325         if (number < 0)
2326                 number = yaffs_CreateNewObjectNumber(dev);
2327
2328         if (type == YAFFS_OBJECT_TYPE_FILE) {
2329                 tn = yaffs_GetTnode(dev);
2330                 if (!tn)
2331                         return NULL;
2332         }
2333
2334         theObject = yaffs_AllocateEmptyObject(dev);
2335         if (!theObject){
2336                 if(tn)
2337                         yaffs_FreeTnode(dev,tn);
2338                 return NULL;
2339         }
2340
2341
2342         if (theObject) {
2343                 theObject->fake = 0;
2344                 theObject->renameAllowed = 1;
2345                 theObject->unlinkAllowed = 1;
2346                 theObject->objectId = number;
2347                 yaffs_HashObject(theObject);
2348                 theObject->variantType = type;
2349 #ifdef CONFIG_YAFFS_WINCE
2350                 yfsd_WinFileTimeNow(theObject->win_atime);
2351                 theObject->win_ctime[0] = theObject->win_mtime[0] =
2352                     theObject->win_atime[0];
2353                 theObject->win_ctime[1] = theObject->win_mtime[1] =
2354                     theObject->win_atime[1];
2355
2356 #else
2357
2358                 theObject->yst_atime = theObject->yst_mtime =
2359                     theObject->yst_ctime = Y_CURRENT_TIME;
2360 #endif
2361                 switch (type) {
2362                 case YAFFS_OBJECT_TYPE_FILE:
2363                         theObject->variant.fileVariant.fileSize = 0;
2364                         theObject->variant.fileVariant.scannedFileSize = 0;
2365                         theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2366                         theObject->variant.fileVariant.topLevel = 0;
2367                         theObject->variant.fileVariant.top = tn;
2368                         break;
2369                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2370                         YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2371                                         children);
2372                         YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2373                                         dirty);
2374                         break;
2375                 case YAFFS_OBJECT_TYPE_SYMLINK:
2376                 case YAFFS_OBJECT_TYPE_HARDLINK:
2377                 case YAFFS_OBJECT_TYPE_SPECIAL:
2378                         /* No action required */
2379                         break;
2380                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2381                         /* todo this should not happen */
2382                         break;
2383                 }
2384         }
2385
2386         return theObject;
2387 }
2388
2389 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
2390                                                       int number,
2391                                                       yaffs_ObjectType type)
2392 {
2393         yaffs_Object *theObject = NULL;
2394
2395         if (number > 0)
2396                 theObject = yaffs_FindObjectByNumber(dev, number);
2397
2398         if (!theObject)
2399                 theObject = yaffs_CreateNewObject(dev, number, type);
2400
2401         return theObject;
2402
2403 }
2404
2405
2406 static YCHAR *yaffs_CloneString(const YCHAR *str)
2407 {
2408         YCHAR *newStr = NULL;
2409         int len;
2410
2411         if (!str)
2412                 str = _Y("");
2413
2414         len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH);
2415         newStr = YMALLOC((len + 1) * sizeof(YCHAR));
2416         if (newStr){
2417                 yaffs_strncpy(newStr, str,len);
2418                 newStr[len] = 0;
2419         }
2420         return newStr;
2421
2422 }
2423
2424 /*
2425  * Mknod (create) a new object.
2426  * equivalentObject only has meaning for a hard link;
2427  * aliasString only has meaning for a symlink.
2428  * rdev only has meaning for devices (a subset of special objects)
2429  */
2430
2431 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2432                                        yaffs_Object *parent,
2433                                        const YCHAR *name,
2434                                        __u32 mode,
2435                                        __u32 uid,
2436                                        __u32 gid,
2437                                        yaffs_Object *equivalentObject,
2438                                        const YCHAR *aliasString, __u32 rdev)
2439 {
2440         yaffs_Object *in;
2441         YCHAR *str = NULL;
2442
2443         yaffs_Device *dev = parent->myDev;
2444
2445         /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2446         if (yaffs_FindObjectByName(parent, name))
2447                 return NULL;
2448
2449         if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2450                 str = yaffs_CloneString(aliasString);
2451                 if (!str)
2452                         return NULL;
2453         }
2454
2455         in = yaffs_CreateNewObject(dev, -1, type);
2456
2457         if (!in){
2458                 if(str)
2459                         YFREE(str);
2460                 return NULL;
2461         }
2462
2463
2464
2465
2466
2467         if (in) {
2468                 in->hdrChunk = 0;
2469                 in->valid = 1;
2470                 in->variantType = type;
2471
2472                 in->yst_mode = mode;
2473
2474 #ifdef CONFIG_YAFFS_WINCE
2475                 yfsd_WinFileTimeNow(in->win_atime);
2476                 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2477                 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2478
2479 #else
2480                 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2481
2482                 in->yst_rdev = rdev;
2483                 in->yst_uid = uid;
2484                 in->yst_gid = gid;
2485 #endif
2486                 in->nDataChunks = 0;
2487
2488                 yaffs_SetObjectName(in, name);
2489                 in->dirty = 1;
2490
2491                 yaffs_AddObjectToDirectory(parent, in);
2492
2493                 in->myDev = parent->myDev;
2494
2495                 switch (type) {
2496                 case YAFFS_OBJECT_TYPE_SYMLINK:
2497                         in->variant.symLinkVariant.alias = str;
2498                         break;
2499                 case YAFFS_OBJECT_TYPE_HARDLINK:
2500                         in->variant.hardLinkVariant.equivalentObject =
2501                                 equivalentObject;
2502                         in->variant.hardLinkVariant.equivalentObjectId =
2503                                 equivalentObject->objectId;
2504                         ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
2505                         break;
2506                 case YAFFS_OBJECT_TYPE_FILE:
2507                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2508                 case YAFFS_OBJECT_TYPE_SPECIAL:
2509                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2510                         /* do nothing */
2511                         break;
2512                 }
2513
2514                 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2515                         /* Could not create the object header, fail the creation */
2516                         yaffs_DeleteObject(in);
2517                         in = NULL;
2518                 }
2519
2520                 yaffs_UpdateParent(parent);
2521         }
2522
2523         return in;
2524 }
2525
2526 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
2527                         __u32 mode, __u32 uid, __u32 gid)
2528 {
2529         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2530                                 uid, gid, NULL, NULL, 0);
2531 }
2532
2533 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
2534                                 __u32 mode, __u32 uid, __u32 gid)
2535 {
2536         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2537                                  mode, uid, gid, NULL, NULL, 0);
2538 }
2539
2540 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
2541                                 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2542 {
2543         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2544                                  uid, gid, NULL, NULL, rdev);
2545 }
2546
2547 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
2548                                 __u32 mode, __u32 uid, __u32 gid,
2549                                 const YCHAR *alias)
2550 {
2551         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2552                                 uid, gid, NULL, alias, 0);
2553 }
2554
2555 /* yaffs_Link returns the object id of the equivalent object.*/
2556 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
2557                         yaffs_Object *equivalentObject)
2558 {
2559         /* Get the real object in case we were fed a hard link as an equivalent object */
2560         equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2561
2562         if (yaffs_MknodObject
2563             (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2564              equivalentObject, NULL, 0)) {
2565                 return equivalentObject;
2566         } else {
2567                 return NULL;
2568         }
2569
2570 }
2571
2572 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
2573                                 const YCHAR *newName, int force, int shadows)
2574 {
2575         int unlinkOp;
2576         int deleteOp;
2577
2578         yaffs_Object *existingTarget;
2579
2580         if (newDir == NULL)
2581                 newDir = obj->parent;   /* use the old directory */
2582
2583         if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2584                 T(YAFFS_TRACE_ALWAYS,
2585                   (TSTR
2586                    ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
2587                     TENDSTR)));
2588                 YBUG();
2589         }
2590
2591         /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2592         if (obj->myDev->param.isYaffs2)
2593                 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2594         else
2595                 unlinkOp = (newDir == obj->myDev->unlinkedDir
2596                             && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2597
2598         deleteOp = (newDir == obj->myDev->deletedDir);
2599
2600         existingTarget = yaffs_FindObjectByName(newDir, newName);
2601
2602         /* If the object is a file going into the unlinked directory,
2603          *   then it is OK to just stuff it in since duplicate names are allowed.
2604          *   else only proceed if the new name does not exist and if we're putting
2605          *   it into a directory.
2606          */
2607         if ((unlinkOp ||
2608              deleteOp ||
2609              force ||
2610              (shadows > 0) ||
2611              !existingTarget) &&
2612             newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2613                 yaffs_SetObjectName(obj, newName);
2614                 obj->dirty = 1;
2615
2616                 yaffs_AddObjectToDirectory(newDir, obj);
2617
2618                 if (unlinkOp)
2619                         obj->unlinked = 1;
2620
2621                 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2622                 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
2623                         return YAFFS_OK;
2624         }
2625
2626         return YAFFS_FAIL;
2627 }
2628
2629 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
2630                 yaffs_Object *newDir, const YCHAR *newName)
2631 {
2632         yaffs_Object *obj = NULL;
2633         yaffs_Object *existingTarget = NULL;
2634         int force = 0;
2635         int result;
2636         yaffs_Device *dev;
2637
2638
2639         if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2640                 YBUG();
2641         if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2642                 YBUG();
2643
2644         dev = oldDir->myDev;
2645
2646 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2647         /* Special case for case insemsitive systems (eg. WinCE).
2648          * While look-up is case insensitive, the name isn't.
2649          * Therefore we might want to change x.txt to X.txt
2650         */
2651         if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
2652                 force = 1;
2653 #endif
2654
2655         if(yaffs_strnlen(newName,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH)
2656                 /* ENAMETOOLONG */
2657                 return YAFFS_FAIL;
2658
2659         obj = yaffs_FindObjectByName(oldDir, oldName);
2660
2661         if (obj && obj->renameAllowed) {
2662
2663                 /* Now do the handling for an existing target, if there is one */
2664
2665                 existingTarget = yaffs_FindObjectByName(newDir, newName);
2666                 if (existingTarget &&
2667                         existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2668                         !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
2669                         /* There is a target that is a non-empty directory, so we fail */
2670                         return YAFFS_FAIL;      /* EEXIST or ENOTEMPTY */
2671                 } else if (existingTarget && existingTarget != obj) {
2672                         /* Nuke the target first, using shadowing,
2673                          * but only if it isn't the same object.
2674                          *
2675                          * Note we must disable gc otherwise it can mess up the shadowing.
2676                          *
2677                          */
2678                         dev->gcDisable=1;
2679                         yaffs_ChangeObjectName(obj, newDir, newName, force,
2680                                                 existingTarget->objectId);
2681                         existingTarget->isShadowed = 1;
2682                         yaffs_UnlinkObject(existingTarget);
2683                         dev->gcDisable=0;
2684                 }
2685
2686                 result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2687
2688                 yaffs_UpdateParent(oldDir);
2689                 if(newDir != oldDir)
2690                         yaffs_UpdateParent(newDir);
2691
2692                 return result;
2693         }
2694         return YAFFS_FAIL;
2695 }
2696
2697 /*------------------------- Block Management and Page Allocation ----------------*/
2698
2699 static int yaffs_InitialiseBlocks(yaffs_Device *dev)
2700 {
2701         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2702
2703         dev->blockInfo = NULL;
2704         dev->chunkBits = NULL;
2705
2706         dev->allocationBlock = -1;      /* force it to get a new one */
2707
2708         /* If the first allocation strategy fails, thry the alternate one */
2709         dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2710         if (!dev->blockInfo) {
2711                 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2712                 dev->blockInfoAlt = 1;
2713         } else
2714                 dev->blockInfoAlt = 0;
2715
2716         if (dev->blockInfo) {
2717                 /* Set up dynamic blockinfo stuff. */
2718                 dev->chunkBitmapStride = (dev->param.nChunksPerBlock + 7) / 8; /* round up bytes */
2719                 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2720                 if (!dev->chunkBits) {
2721                         dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2722                         dev->chunkBitsAlt = 1;
2723                 } else
2724                         dev->chunkBitsAlt = 0;
2725         }
2726
2727         if (dev->blockInfo && dev->chunkBits) {
2728                 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2729                 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2730                 return YAFFS_OK;
2731         }
2732
2733         return YAFFS_FAIL;
2734 }
2735
2736 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2737 {
2738         if (dev->blockInfoAlt && dev->blockInfo)
2739                 YFREE_ALT(dev->blockInfo);
2740         else if (dev->blockInfo)
2741                 YFREE(dev->blockInfo);
2742
2743         dev->blockInfoAlt = 0;
2744
2745         dev->blockInfo = NULL;
2746
2747         if (dev->chunkBitsAlt && dev->chunkBits)
2748                 YFREE_ALT(dev->chunkBits);
2749         else if (dev->chunkBits)
2750                 YFREE(dev->chunkBits);
2751         dev->chunkBitsAlt = 0;
2752         dev->chunkBits = NULL;
2753 }
2754
2755 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
2756                                         yaffs_BlockInfo *bi)
2757 {
2758
2759         if (!dev->param.isYaffs2)
2760                 return 1;       /* disqualification only applies to yaffs2. */
2761
2762         if (!bi->hasShrinkHeader)
2763                 return 1;       /* can gc */
2764
2765         yaffs_FindOldestDirtySequence(dev);
2766
2767         /* Can't do gc of this block if there are any blocks older than this one that have
2768          * discarded pages.
2769          */
2770         return (bi->sequenceNumber <= dev->oldestDirtySequence);
2771 }
2772
2773 /*
2774  * yaffs_FindRefreshBlock()
2775  * periodically finds the oldest full block by sequence number for refreshing.
2776  * Only for yaffs2.
2777  */
2778 static __u32 yaffs_FindRefreshBlock(yaffs_Device *dev)
2779 {
2780         __u32 b ;
2781
2782         __u32 oldest = 0;
2783         __u32 oldestSequence = 0;
2784
2785         yaffs_BlockInfo *bi;
2786
2787         /*
2788          * If refresh period < 10 then refreshing is disabled.
2789          */
2790         if(dev->param.refreshPeriod < 10 ||
2791                 !dev->param.isYaffs2)
2792                 return oldest;
2793
2794         /*
2795          * Fix broken values.
2796          */
2797         if(dev->refreshSkip > dev->param.refreshPeriod)
2798                 dev->refreshSkip = dev->param.refreshPeriod;
2799
2800         if(dev->refreshSkip > 0)
2801                 return oldest;
2802
2803         /*
2804          * Refresh skip is now zero.
2805          * We'll do a refresh this time around....
2806          * Update the refresh skip and find the oldest block.
2807          */
2808         dev->refreshSkip = dev->param.refreshPeriod;
2809         dev->refreshCount++;
2810         bi = dev->blockInfo;
2811         for (b = dev->internalStartBlock; b <=dev->internalEndBlock; b++){
2812
2813                 if (bi->blockState == YAFFS_BLOCK_STATE_FULL){
2814
2815                         if(oldest < 1 ||
2816                                 bi->sequenceNumber < oldestSequence){
2817                                 oldest = b;
2818                                 oldestSequence = bi->sequenceNumber;
2819                         }
2820                 }
2821                 bi++;
2822         }
2823
2824         if (oldest > 0) {
2825                 T(YAFFS_TRACE_GC,
2826                   (TSTR("GC refresh count %d selected block %d with sequenceNumber %d" TENDSTR),
2827                    dev->refreshCount, oldest, oldestSequence));
2828         }
2829
2830         return oldest;
2831 }
2832
2833
2834 static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
2835 {
2836         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2837
2838         int erasedOk = 0;
2839
2840         /* If the block is still healthy erase it and mark as clean.
2841          * If the block has had a data failure, then retire it.
2842          */
2843
2844         T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2845                 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2846                 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2847
2848         yaffs_ClearOldestDirtySequence(dev,bi);
2849
2850         bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2851
2852         /* If this is the block being garbage collected then stop gc'ing this block */
2853         if(blockNo == dev->gcBlock)
2854                 dev->gcBlock = 0;
2855
2856         /* If this block is currently the best candidate for gc then drop as a candidate */
2857         if(blockNo == dev->gcDirtiest){
2858                 dev->gcDirtiest = 0;
2859                 dev->gcPagesInUse = 0;
2860         }
2861
2862         if (!bi->needsRetiring) {
2863                 yaffs_InvalidateCheckpoint(dev);
2864                 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2865                 if (!erasedOk) {
2866                         dev->nErasureFailures++;
2867                         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2868                           (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2869                 }
2870         }
2871
2872         if (erasedOk &&
2873             ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2874                 int i;
2875                 for (i = 0; i < dev->param.nChunksPerBlock; i++) {
2876                         if (!yaffs_CheckChunkErased
2877                             (dev, blockNo * dev->param.nChunksPerBlock + i)) {
2878                                 T(YAFFS_TRACE_ERROR,
2879                                   (TSTR
2880                                    (">>Block %d erasure supposedly OK, but chunk %d not erased"
2881                                     TENDSTR), blockNo, i));
2882                         }
2883                 }
2884         }
2885
2886         if (erasedOk) {
2887                 /* Clean it up... */
2888                 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2889                 bi->sequenceNumber = 0;
2890                 dev->nErasedBlocks++;
2891                 bi->pagesInUse = 0;
2892                 bi->softDeletions = 0;
2893                 bi->hasShrinkHeader = 0;
2894                 bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
2895                 bi->gcPrioritise = 0;
2896                 yaffs_ClearChunkBits(dev, blockNo);
2897
2898                 T(YAFFS_TRACE_ERASE,
2899                   (TSTR("Erased block %d" TENDSTR), blockNo));
2900         } else {
2901                 dev->nFreeChunks -= dev->param.nChunksPerBlock; /* We lost a block of free space */
2902
2903                 yaffs_RetireBlock(dev, blockNo);
2904                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2905                   (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2906         }
2907 }
2908
2909 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2910 {
2911         int i;
2912
2913         yaffs_BlockInfo *bi;
2914
2915         if (dev->nErasedBlocks < 1) {
2916                 /* Hoosterman we've got a problem.
2917                  * Can't get space to gc
2918                  */
2919                 T(YAFFS_TRACE_ERROR,
2920                   (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
2921
2922                 return -1;
2923         }
2924
2925         /* Find an empty block. */
2926
2927         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2928                 dev->allocationBlockFinder++;
2929                 if (dev->allocationBlockFinder < dev->internalStartBlock
2930                     || dev->allocationBlockFinder > dev->internalEndBlock) {
2931                         dev->allocationBlockFinder = dev->internalStartBlock;
2932                 }
2933
2934                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2935
2936                 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2937                         bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2938                         dev->sequenceNumber++;
2939                         bi->sequenceNumber = dev->sequenceNumber;
2940                         dev->nErasedBlocks--;
2941                         T(YAFFS_TRACE_ALLOCATE,
2942                           (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
2943                            dev->allocationBlockFinder, dev->sequenceNumber,
2944                            dev->nErasedBlocks));
2945                         return dev->allocationBlockFinder;
2946                 }
2947         }
2948
2949         T(YAFFS_TRACE_ALWAYS,
2950           (TSTR
2951            ("yaffs tragedy: no more erased blocks, but there should have been %d"
2952             TENDSTR), dev->nErasedBlocks));
2953
2954         return -1;
2955 }
2956
2957
2958
2959 static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
2960 {
2961         if (!dev->nCheckpointBlocksRequired &&
2962            dev->param.isYaffs2) {
2963                 /* Not a valid value so recalculate */
2964                 int nBytes = 0;
2965                 int nBlocks;
2966                 int devBlocks = (dev->param.endBlock - dev->param.startBlock + 1);
2967                 int tnodeSize = yaffs_CalcTnodeSize(dev);
2968
2969                 nBytes += sizeof(yaffs_CheckpointValidity);
2970                 nBytes += sizeof(yaffs_CheckpointDevice);
2971                 nBytes += devBlocks * sizeof(yaffs_BlockInfo);
2972                 nBytes += devBlocks * dev->chunkBitmapStride;
2973                 nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
2974                 nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
2975                 nBytes += sizeof(yaffs_CheckpointValidity);
2976                 nBytes += sizeof(__u32); /* checksum*/
2977
2978                 /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
2979
2980                 nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->param.nChunksPerBlock)) + 3;
2981
2982                 dev->nCheckpointBlocksRequired = nBlocks;
2983         }
2984
2985         return dev->nCheckpointBlocksRequired;
2986 }
2987
2988 /*
2989  * Check if there's space to allocate...
2990  * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2991  */
2992 static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev, int nChunks)
2993 {
2994         int reservedChunks;
2995         int reservedBlocks = dev->param.nReservedBlocks;
2996         int checkpointBlocks;
2997
2998         if (dev->param.isYaffs2) {
2999                 checkpointBlocks =  yaffs_CalcCheckpointBlocksRequired(dev) -
3000                                     dev->blocksInCheckpoint;
3001                 if (checkpointBlocks < 0)
3002                         checkpointBlocks = 0;
3003         } else {
3004                 checkpointBlocks = 0;
3005         }
3006
3007         reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.nChunksPerBlock);
3008
3009         return (dev->nFreeChunks > (reservedChunks + nChunks));
3010 }
3011
3012 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
3013                 yaffs_BlockInfo **blockUsedPtr)
3014 {
3015         int retVal;
3016         yaffs_BlockInfo *bi;
3017
3018         if (dev->allocationBlock < 0) {
3019                 /* Get next block to allocate off */
3020                 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
3021                 dev->allocationPage = 0;
3022         }
3023
3024         if (!useReserve && !yaffs_CheckSpaceForAllocation(dev, 1)) {
3025                 /* Not enough space to allocate unless we're allowed to use the reserve. */
3026                 return -1;
3027         }
3028
3029         if (dev->nErasedBlocks < dev->param.nReservedBlocks
3030                         && dev->allocationPage == 0) {
3031                 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
3032         }
3033
3034         /* Next page please.... */
3035         if (dev->allocationBlock >= 0) {
3036                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3037
3038                 retVal = (dev->allocationBlock * dev->param.nChunksPerBlock) +
3039                         dev->allocationPage;
3040                 bi->pagesInUse++;
3041                 yaffs_SetChunkBit(dev, dev->allocationBlock,
3042                                 dev->allocationPage);
3043
3044                 dev->allocationPage++;
3045
3046                 dev->nFreeChunks--;
3047
3048                 /* If the block is full set the state to full */
3049                 if (dev->allocationPage >= dev->param.nChunksPerBlock) {
3050                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
3051                         dev->allocationBlock = -1;
3052                 }
3053
3054                 if (blockUsedPtr)
3055                         *blockUsedPtr = bi;
3056
3057                 return retVal;
3058         }
3059
3060         T(YAFFS_TRACE_ERROR,
3061                         (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
3062
3063         return -1;
3064 }
3065
3066 static int yaffs_GetErasedChunks(yaffs_Device *dev)
3067 {
3068         int n;
3069
3070         n = dev->nErasedBlocks * dev->param.nChunksPerBlock;
3071
3072         if (dev->allocationBlock > 0)
3073                 n += (dev->param.nChunksPerBlock - dev->allocationPage);
3074
3075         return n;
3076
3077 }
3078
3079 /*
3080  * yaffs_SkipRestOfBlock() skips over the rest of the allocation block
3081  * if we don't want to write to it.
3082  */
3083 static void yaffs_SkipRestOfBlock(yaffs_Device *dev)
3084 {
3085         if(dev->allocationBlock > 0){
3086                 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3087                 if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){
3088                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
3089                         dev->allocationBlock = -1;
3090                 }
3091         }
3092 }
3093
3094
3095 static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
3096                 int wholeBlock)
3097 {
3098         int oldChunk;
3099         int newChunk;
3100         int markNAND;
3101         int retVal = YAFFS_OK;
3102         int cleanups = 0;
3103         int i;
3104         int isCheckpointBlock;
3105         int matchingChunk;
3106         int maxCopies;
3107
3108         int chunksBefore = yaffs_GetErasedChunks(dev);
3109         int chunksAfter;
3110
3111         yaffs_ExtendedTags tags;
3112
3113         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
3114
3115         yaffs_Object *object;
3116
3117         isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
3118
3119
3120         T(YAFFS_TRACE_TRACING,
3121                         (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
3122                          block,
3123                          bi->pagesInUse,
3124                          bi->hasShrinkHeader,
3125                          wholeBlock));
3126
3127         /*yaffs_VerifyFreeChunks(dev); */
3128
3129         if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
3130                 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
3131
3132         bi->hasShrinkHeader = 0;        /* clear the flag so that the block can erase */
3133
3134         dev->gcDisable = 1;
3135
3136         if (isCheckpointBlock ||
3137                         !yaffs_StillSomeChunkBits(dev, block)) {
3138                 T(YAFFS_TRACE_TRACING,
3139                                 (TSTR
3140                                  ("Collecting block %d that has no chunks in use" TENDSTR),
3141                                  block));
3142                 yaffs_BlockBecameDirty(dev, block);
3143         } else {
3144
3145                 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
3146
3147                 yaffs_VerifyBlock(dev, bi, block);
3148
3149                 maxCopies = (wholeBlock) ? dev->param.nChunksPerBlock : 5;
3150                 oldChunk = block * dev->param.nChunksPerBlock + dev->gcChunk;
3151
3152                 for (/* init already done */;
3153                      retVal == YAFFS_OK &&
3154                      dev->gcChunk < dev->param.nChunksPerBlock &&
3155                      (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
3156                      maxCopies > 0;
3157                      dev->gcChunk++, oldChunk++) {
3158                         if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
3159
3160                                 /* This page is in use and might need to be copied off */
3161
3162                                 maxCopies--;
3163
3164                                 markNAND = 1;
3165
3166                                 yaffs_InitialiseTags(&tags);
3167
3168                                 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
3169                                                                 buffer, &tags);
3170
3171                                 object =
3172                                     yaffs_FindObjectByNumber(dev,
3173                                                              tags.objectId);
3174
3175                                 T(YAFFS_TRACE_GC_DETAIL,
3176                                   (TSTR
3177                                    ("Collecting chunk in block %d, %d %d %d " TENDSTR),
3178                                    dev->gcChunk, tags.objectId, tags.chunkId,
3179                                    tags.byteCount));
3180
3181                                 if (object && !yaffs_SkipVerification(dev)) {
3182                                         if (tags.chunkId == 0)
3183                                                 matchingChunk = object->hdrChunk;
3184                                         else if (object->softDeleted)
3185                                                 matchingChunk = oldChunk; /* Defeat the test */
3186                                         else
3187                                                 matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
3188
3189                                         if (oldChunk != matchingChunk)
3190                                                 T(YAFFS_TRACE_ERROR,
3191                                                   (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
3192                                                   oldChunk, matchingChunk, tags.objectId, tags.chunkId));
3193
3194                                 }
3195
3196                                 if (!object) {
3197                                         T(YAFFS_TRACE_ERROR,
3198                                           (TSTR
3199                                            ("page %d in gc has no object: %d %d %d "
3200                                             TENDSTR), oldChunk,
3201                                             tags.objectId, tags.chunkId, tags.byteCount));
3202                                 }
3203
3204                                 if (object &&
3205                                     object->deleted &&
3206                                     object->softDeleted &&
3207                                     tags.chunkId != 0) {
3208                                         /* Data chunk in a soft deleted file, throw it away
3209                                          * It's a soft deleted data chunk,
3210                                          * No need to copy this, just forget about it and
3211                                          * fix up the object.
3212                                          */
3213
3214                                         /* Free chunks already includes softdeleted chunks.
3215                                          * How ever this chunk is going to soon be really deleted
3216                                          * which will increment free chunks.
3217                                          * We have to decrement free chunks so this works out properly.
3218                                          */
3219                                         dev->nFreeChunks--;
3220
3221                                         object->nDataChunks--;
3222
3223                                         if (object->nDataChunks <= 0) {
3224                                                 /* remeber to clean up the object */
3225                                                 dev->gcCleanupList[cleanups] =
3226                                                     tags.objectId;
3227                                                 cleanups++;
3228                                         }
3229                                         markNAND = 0;
3230                                 } else if (0) {
3231                                         /* Todo object && object->deleted && object->nDataChunks == 0 */
3232                                         /* Deleted object header with no data chunks.
3233                                          * Can be discarded and the file deleted.
3234                                          */
3235                                         object->hdrChunk = 0;
3236                                         yaffs_FreeTnode(object->myDev,
3237                                                         object->variant.
3238                                                         fileVariant.top);
3239                                         object->variant.fileVariant.top = NULL;
3240                                         yaffs_DoGenericObjectDeletion(object);
3241
3242                                 } else if (object) {
3243                                         /* It's either a data chunk in a live file or
3244                                          * an ObjectHeader, so we're interested in it.
3245                                          * NB Need to keep the ObjectHeaders of deleted files
3246                                          * until the whole file has been deleted off
3247                                          */
3248                                         tags.serialNumber++;
3249
3250                                         dev->nGCCopies++;
3251
3252                                         if (tags.chunkId == 0) {
3253                                                 /* It is an object Id,
3254                                                  * We need to nuke the shrinkheader flags first
3255                                                  * Also need to clean up shadowing.
3256                                                  * We no longer want the shrinkHeader flag since its work is done
3257                                                  * and if it is left in place it will mess up scanning.
3258                                                  */
3259
3260                                                 yaffs_ObjectHeader *oh;
3261                                                 oh = (yaffs_ObjectHeader *)buffer;
3262
3263                                                 oh->isShrink = 0;
3264                                                 tags.extraIsShrinkHeader = 0;
3265
3266                                                 oh->shadowsObject = 0;
3267                                                 oh->inbandShadowsObject = 0;
3268                                                 tags.extraShadows = 0;
3269
3270                                                 /* Update file size */
3271                                                 if(object->variantType == YAFFS_OBJECT_TYPE_FILE){
3272                                                         oh->fileSize = object->variant.fileVariant.fileSize;
3273                                                         tags.extraFileLength = oh->fileSize;
3274                                                 }
3275
3276                                                 yaffs_VerifyObjectHeader(object, oh, &tags, 1);
3277                                                 newChunk =
3278                                                     yaffs_WriteNewChunkWithTagsToNAND(dev,(__u8 *) oh, &tags, 1);
3279                                         } else
3280                                                 newChunk =
3281                                                     yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3282
3283                                         if (newChunk < 0) {
3284                                                 retVal = YAFFS_FAIL;
3285                                         } else {
3286
3287                                                 /* Ok, now fix up the Tnodes etc. */
3288
3289                                                 if (tags.chunkId == 0) {
3290                                                         /* It's a header */
3291                                                         object->hdrChunk =  newChunk;
3292                                                         object->serial =   tags.serialNumber;
3293                                                 } else {
3294                                                         /* It's a data chunk */
3295                                                         int ok;
3296                                                         ok = yaffs_PutChunkIntoFile
3297                                                             (object,
3298                                                              tags.chunkId,
3299                                                              newChunk, 0);
3300                                                 }
3301                                         }
3302                                 }
3303
3304                                 if (retVal == YAFFS_OK)
3305                                         yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3306
3307                         }
3308                 }
3309
3310                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3311
3312
3313                 /* Do any required cleanups */
3314                 for (i = 0; i < cleanups; i++) {
3315                         /* Time to delete the file too */
3316                         object =
3317                             yaffs_FindObjectByNumber(dev,
3318                                                      dev->gcCleanupList[i]);
3319                         if (object) {
3320                                 yaffs_FreeTnode(dev,
3321                                                 object->variant.fileVariant.
3322                                                 top);
3323                                 object->variant.fileVariant.top = NULL;
3324                                 T(YAFFS_TRACE_GC,
3325                                   (TSTR
3326                                    ("yaffs: About to finally delete object %d"
3327                                     TENDSTR), object->objectId));
3328                                 yaffs_DoGenericObjectDeletion(object);
3329                                 object->myDev->nDeletedFiles--;
3330                         }
3331
3332                 }
3333
3334         }
3335
3336         yaffs_VerifyCollectedBlock(dev, bi, block);
3337
3338
3339
3340         if (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3341                 /*
3342                  * The gc did not complete. Set block state back to FULL
3343                  * because checkpointing does not restore gc.
3344                  */
3345                 bi->blockState = YAFFS_BLOCK_STATE_FULL;
3346         } else {
3347                 /* The gc completed. */
3348                 chunksAfter = yaffs_GetErasedChunks(dev);
3349                 if (chunksBefore >= chunksAfter) {
3350                         T(YAFFS_TRACE_GC,
3351                           (TSTR
3352                            ("gc did not increase free chunks before %d after %d"
3353                             TENDSTR), chunksBefore, chunksAfter));
3354                 }
3355                 dev->gcBlock = 0;
3356                 dev->gcChunk = 0;
3357         }
3358
3359         dev->gcDisable = 0;
3360
3361         return retVal;
3362 }
3363
3364 /*
3365  * FindBlockForgarbageCollection is used to select the dirtiest block (or close enough)
3366  * for garbage collection.
3367  */
3368
3369 static unsigned yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
3370                                         int aggressive,
3371                                         int background)
3372 {
3373         int i;
3374         int iterations;
3375         unsigned selected = 0;
3376         int prioritised = 0;
3377         int prioritisedExists = 0;
3378         yaffs_BlockInfo *bi;
3379         int threshold;
3380
3381         /* First let's see if we need to grab a prioritised block */
3382         if (dev->hasPendingPrioritisedGCs && !aggressive) {
3383                 dev->gcDirtiest = 0;
3384                 bi = dev->blockInfo;
3385                 for (i = dev->internalStartBlock;
3386                         i <= dev->internalEndBlock && !selected;
3387                         i++) {
3388
3389                         if (bi->gcPrioritise) {
3390                                 prioritisedExists = 1;
3391                                 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
3392                                    yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
3393                                         selected = i;
3394                                         prioritised = 1;
3395                                 }
3396                         }
3397                         bi++;
3398                 }
3399
3400                 /*
3401                  * If there is a prioritised block and none was selected then
3402                  * this happened because there is at least one old dirty block gumming
3403                  * up the works. Let's gc the oldest dirty block.
3404                  */
3405
3406                 if(prioritisedExists &&
3407                         !selected &&
3408                         dev->oldestDirtyBlock > 0)
3409                         selected = dev->oldestDirtyBlock;
3410
3411                 if (!prioritisedExists) /* None found, so we can clear this */
3412                         dev->hasPendingPrioritisedGCs = 0;
3413         }
3414
3415         /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
3416          * search harder.
3417          * else (we're doing a leasurely gc), then we only bother to do this if the
3418          * block has only a few pages in use.
3419          */
3420
3421         if (!selected){
3422                 int pagesUsed;
3423                 int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
3424                 if (aggressive){
3425                         threshold = dev->param.nChunksPerBlock;
3426                         iterations = nBlocks;
3427                 } else {
3428                         int maxThreshold = dev->param.nChunksPerBlock/2;
3429                         threshold = background ?
3430                                 (dev->gcNotDone + 2) * 2 : 0;
3431                         if(threshold <YAFFS_GC_PASSIVE_THRESHOLD)
3432                                 threshold = YAFFS_GC_PASSIVE_THRESHOLD;
3433                         if(threshold > maxThreshold)
3434                                 threshold = maxThreshold;
3435
3436                         iterations = nBlocks / 16 + 1;
3437                         if (iterations > 100)
3438                                 iterations = 100;
3439                 }
3440
3441                 for (i = 0;
3442                         i < iterations &&
3443                         (dev->gcDirtiest < 1 ||
3444                                 dev->gcPagesInUse > YAFFS_GC_GOOD_ENOUGH);
3445                         i++) {
3446                         dev->gcBlockFinder++;
3447                         if (dev->gcBlockFinder < dev->internalStartBlock ||
3448                                 dev->gcBlockFinder > dev->internalEndBlock)
3449                                 dev->gcBlockFinder = dev->internalStartBlock;
3450
3451                         bi = yaffs_GetBlockInfo(dev, dev->gcBlockFinder);
3452
3453                         pagesUsed = bi->pagesInUse - bi->softDeletions;
3454
3455                         if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
3456                                 pagesUsed < dev->param.nChunksPerBlock &&
3457                                 (dev->gcDirtiest < 1 || pagesUsed < dev->gcPagesInUse) &&
3458                                 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
3459                                 dev->gcDirtiest = dev->gcBlockFinder;
3460                                 dev->gcPagesInUse = pagesUsed;
3461                         }
3462                 }
3463
3464                 if(dev->gcDirtiest > 0 && dev->gcPagesInUse <= threshold)
3465                         selected = dev->gcDirtiest;
3466         }
3467
3468         if(!selected && dev->param.isYaffs2 && dev->gcNotDone >= ( background ? 10 : 20)){
3469                 yaffs_FindOldestDirtySequence(dev);
3470                 if(dev->oldestDirtyBlock > 0) {
3471                         selected = dev->oldestDirtyBlock;
3472                         dev->gcDirtiest = selected;
3473                         bi = yaffs_GetBlockInfo(dev, selected);
3474                         dev->gcPagesInUse =  bi->pagesInUse - bi->softDeletions;
3475                 } else
3476                         dev->gcNotDone = 0;
3477         }
3478
3479         if(selected){
3480                 T(YAFFS_TRACE_GC,
3481                   (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR),
3482                   selected,
3483                   dev->param.nChunksPerBlock - dev->gcPagesInUse,
3484                   prioritised));
3485
3486                 dev->gcDirtiest = 0;
3487                 dev->gcPagesInUse = 0;
3488                 dev->gcNotDone = 0;
3489                 if(dev->refreshSkip > 0)
3490                         dev->refreshSkip--;
3491         } else{
3492                 dev->gcNotDone++;
3493                 T(YAFFS_TRACE_GC,
3494                   (TSTR("GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s" TENDSTR),
3495                   dev->gcBlockFinder, dev->gcNotDone,
3496                   threshold,
3497                   dev->gcDirtiest, dev->gcPagesInUse,
3498                   dev->oldestDirtyBlock,
3499                   background ? " bg" : ""));
3500         }
3501
3502         return selected;
3503 }
3504
3505 /* New garbage collector
3506  * If we're very low on erased blocks then we do aggressive garbage collection
3507  * otherwise we do "leasurely" garbage collection.
3508  * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3509  * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3510  *
3511  * The idea is to help clear out space in a more spread-out manner.
3512  * Dunno if it really does anything useful.
3513  */
3514 static int yaffs_CheckGarbageCollection(yaffs_Device *dev, int background)
3515 {
3516         int aggressive = 0;
3517         int gcOk = YAFFS_OK;
3518         int maxTries = 0;
3519
3520         int minErased;
3521         int erasedChunks;
3522
3523         int checkpointBlockAdjust;
3524
3525         if(dev->param.gcControl &&
3526                 (dev->param.gcControl(dev) & 1) == 0)
3527                 return YAFFS_OK;
3528
3529         if (dev->gcDisable) {
3530                 /* Bail out so we don't get recursive gc */
3531                 return YAFFS_OK;
3532         }
3533
3534         /* This loop should pass the first time.
3535          * We'll only see looping here if the collection does not increase space.
3536          */
3537
3538         do {
3539                 maxTries++;
3540
3541                 checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
3542                 if (checkpointBlockAdjust < 0)
3543                         checkpointBlockAdjust = 0;
3544
3545                 minErased  = dev->param.nReservedBlocks + checkpointBlockAdjust + 1;
3546                 erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
3547
3548                 /* If we need a block soon then do aggressive gc.*/
3549                 if (dev->nErasedBlocks < minErased)
3550                         aggressive = 1;
3551                 else {
3552                         if(dev->gcSkip > 20)
3553                                 dev->gcSkip = 20;
3554                         if(erasedChunks < dev->nFreeChunks/2 ||
3555                                 dev->gcSkip < 1 ||
3556                                 background)
3557                                 aggressive = 0;
3558                         else {
3559                                 dev->gcSkip--;
3560                                 break;
3561                         }
3562                 }
3563
3564                 dev->gcSkip = 5;
3565
3566                 /* If we don't already have a block being gc'd then see if we should start another */
3567
3568                 if (dev->gcBlock < 1 && !aggressive) {
3569                         dev->gcBlock = yaffs_FindRefreshBlock(dev);
3570                         dev->gcChunk = 0;
3571                 }
3572                 if (dev->gcBlock < 1) {
3573                         dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive, background);
3574                         dev->gcChunk = 0;
3575                 }
3576
3577                 if (dev->gcBlock > 0) {
3578                         dev->garbageCollections++;
3579                         if (!aggressive)
3580                                 dev->passiveGarbageCollections++;
3581
3582                         T(YAFFS_TRACE_GC,
3583                           (TSTR
3584                            ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3585                            dev->nErasedBlocks, aggressive));
3586
3587                         gcOk = yaffs_GarbageCollectBlock(dev, dev->gcBlock, aggressive);
3588                 }
3589
3590                 if (dev->nErasedBlocks < (dev->param.nReservedBlocks) && dev->gcBlock > 0) {
3591                         T(YAFFS_TRACE_GC,
3592                           (TSTR
3593                            ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3594                             TENDSTR), dev->nErasedBlocks, maxTries, dev->gcBlock));
3595                 }
3596         } while ((dev->nErasedBlocks < dev->param.nReservedBlocks) &&
3597                  (dev->gcBlock > 0) &&
3598                  (maxTries < 2));
3599
3600         return aggressive ? gcOk : YAFFS_OK;
3601 }
3602
3603 /*
3604  * yaffs_BackgroundGarbageCollect()
3605  * Garbage collects. Intended to be called from a background thread.
3606  * Returns non-zero if at least half the free chunks are erased.
3607  */
3608 int yaffs_BackgroundGarbageCollect(yaffs_Device *dev)
3609 {
3610         int erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
3611
3612         T(YAFFS_TRACE_BACKGROUND, (TSTR("Background gc" TENDSTR)));
3613
3614         yaffs_CheckGarbageCollection(dev, 1);
3615         return erasedChunks > dev->nFreeChunks/2;
3616 }
3617
3618 /*-------------------------  TAGS --------------------------------*/
3619
3620 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
3621                            int chunkInObject)
3622 {
3623         return (tags->chunkId == chunkInObject &&
3624                 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3625
3626 }
3627
3628
3629 /*-------------------- Data file manipulation -----------------*/
3630
3631 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
3632                                  yaffs_ExtendedTags *tags)
3633 {
3634         /*Get the Tnode, then get the level 0 offset chunk offset */
3635         yaffs_Tnode *tn;
3636         int theChunk = -1;
3637         yaffs_ExtendedTags localTags;
3638         int retVal = -1;
3639
3640         yaffs_Device *dev = in->myDev;
3641
3642         if (!tags) {
3643                 /* Passed a NULL, so use our own tags space */
3644                 tags = &localTags;
3645         }
3646
3647         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3648
3649         if (tn) {
3650                 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3651
3652                 retVal =
3653                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3654                                            chunkInInode);
3655         }
3656         return retVal;
3657 }
3658
3659 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
3660                                           yaffs_ExtendedTags *tags)
3661 {
3662         /* Get the Tnode, then get the level 0 offset chunk offset */
3663         yaffs_Tnode *tn;
3664         int theChunk = -1;
3665         yaffs_ExtendedTags localTags;
3666
3667         yaffs_Device *dev = in->myDev;
3668         int retVal = -1;
3669
3670         if (!tags) {
3671                 /* Passed a NULL, so use our own tags space */
3672                 tags = &localTags;
3673         }
3674
3675         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3676
3677         if (tn) {
3678
3679                 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3680
3681                 retVal =
3682                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3683                                            chunkInInode);
3684
3685                 /* Delete the entry in the filestructure (if found) */
3686                 if (retVal != -1)
3687                         yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0);
3688         }
3689
3690         return retVal;
3691 }
3692
3693 #ifdef YAFFS_PARANOID
3694
3695 static int yaffs_CheckFileSanity(yaffs_Object *in)
3696 {
3697         int chunk;
3698         int nChunks;
3699         int fSize;
3700         int failed = 0;
3701         int objId;
3702         yaffs_Tnode *tn;
3703         yaffs_Tags localTags;
3704         yaffs_Tags *tags = &localTags;
3705         int theChunk;
3706         int chunkDeleted;
3707
3708         if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
3709                 return YAFFS_FAIL;
3710
3711         objId = in->objectId;
3712         fSize = in->variant.fileVariant.fileSize;
3713         nChunks =
3714             (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3715
3716         for (chunk = 1; chunk <= nChunks; chunk++) {
3717                 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3718                                            chunk);
3719
3720                 if (tn) {
3721
3722                         theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
3723
3724                         if (yaffs_CheckChunkBits
3725                             (dev, theChunk / dev->param.nChunksPerBlock,
3726                              theChunk % dev->param.nChunksPerBlock)) {
3727
3728                                 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3729                                                             tags,
3730                                                             &chunkDeleted);
3731                                 if (yaffs_TagsMatch
3732                                     (tags, in->objectId, chunk, chunkDeleted)) {
3733                                         /* found it; */
3734
3735                                 }
3736                         } else {
3737
3738                                 failed = 1;
3739                         }
3740
3741                 } else {
3742                         /* T(("No level 0 found for %d\n", chunk)); */
3743                 }
3744         }
3745
3746         return failed ? YAFFS_FAIL : YAFFS_OK;
3747 }
3748
3749 #endif
3750
3751 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
3752                                   int chunkInNAND, int inScan)
3753 {
3754         /* NB inScan is zero unless scanning.
3755          * For forward scanning, inScan is > 0;
3756          * for backward scanning inScan is < 0
3757          *
3758          * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there.
3759          */
3760
3761         yaffs_Tnode *tn;
3762         yaffs_Device *dev = in->myDev;
3763         int existingChunk;
3764         yaffs_ExtendedTags existingTags;
3765         yaffs_ExtendedTags newTags;
3766         unsigned existingSerial, newSerial;
3767
3768         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3769                 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3770                  * If it is not during Scanning then something went wrong!
3771                  */
3772                 if (!inScan) {
3773                         T(YAFFS_TRACE_ERROR,
3774                           (TSTR
3775                            ("yaffs tragedy:attempt to put data chunk into a non-file"
3776                             TENDSTR)));
3777                         YBUG();
3778                 }
3779
3780                 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3781                 return YAFFS_OK;
3782         }
3783
3784         tn = yaffs_AddOrFindLevel0Tnode(dev,
3785                                         &in->variant.fileVariant,
3786                                         chunkInInode,
3787                                         NULL);
3788         if (!tn)
3789                 return YAFFS_FAIL;
3790
3791         if(!chunkInNAND)
3792                 /* Dummy insert, bail now */
3793                 return YAFFS_OK;
3794
3795         existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3796
3797         if (inScan != 0) {
3798                 /* If we're scanning then we need to test for duplicates
3799                  * NB This does not need to be efficient since it should only ever
3800                  * happen when the power fails during a write, then only one
3801                  * chunk should ever be affected.
3802                  *
3803                  * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3804                  * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3805                  */
3806
3807                 if (existingChunk > 0) {
3808                         /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3809                          *    thus we have to do a FindChunkInFile to get the real chunk id.
3810                          *
3811                          * We have a duplicate now we need to decide which one to use:
3812                          *
3813                          * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3814                          * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3815                          * YAFFS1: Get both sets of tags and compare serial numbers.
3816                          */
3817
3818                         if (inScan > 0) {
3819                                 /* Only do this for forward scanning */
3820                                 yaffs_ReadChunkWithTagsFromNAND(dev,
3821                                                                 chunkInNAND,
3822                                                                 NULL, &newTags);
3823
3824                                 /* Do a proper find */
3825                                 existingChunk =
3826                                     yaffs_FindChunkInFile(in, chunkInInode,
3827                                                           &existingTags);
3828                         }
3829
3830                         if (existingChunk <= 0) {
3831                                 /*Hoosterman - how did this happen? */
3832
3833                                 T(YAFFS_TRACE_ERROR,
3834                                   (TSTR
3835                                    ("yaffs tragedy: existing chunk < 0 in scan"
3836                                     TENDSTR)));
3837
3838                         }
3839
3840                         /* NB The deleted flags should be false, otherwise the chunks will
3841                          * not be loaded during a scan
3842                          */
3843
3844                         if (inScan > 0) {
3845                                 newSerial = newTags.serialNumber;
3846                                 existingSerial = existingTags.serialNumber;
3847                         }
3848
3849                         if ((inScan > 0) &&
3850                             (in->myDev->param.isYaffs2 ||
3851                              existingChunk <= 0 ||
3852                              ((existingSerial + 1) & 3) == newSerial)) {
3853                                 /* Forward scanning.
3854                                  * Use new
3855                                  * Delete the old one and drop through to update the tnode
3856                                  */
3857                                 yaffs_DeleteChunk(dev, existingChunk, 1,
3858                                                   __LINE__);
3859                         } else {
3860                                 /* Backward scanning or we want to use the existing one
3861                                  * Use existing.
3862                                  * Delete the new one and return early so that the tnode isn't changed
3863                                  */
3864                                 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3865                                                   __LINE__);
3866                                 return YAFFS_OK;
3867                         }
3868                 }
3869
3870         }
3871
3872         if (existingChunk == 0)
3873                 in->nDataChunks++;
3874
3875         yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
3876
3877         return YAFFS_OK;
3878 }
3879
3880 static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
3881                                         __u8 *buffer)
3882 {
3883         int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3884
3885         if (chunkInNAND >= 0)
3886                 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3887                                                 buffer, NULL);
3888         else {
3889                 T(YAFFS_TRACE_NANDACCESS,
3890                   (TSTR("Chunk %d not found zero instead" TENDSTR),
3891                    chunkInNAND));
3892                 /* get sane (zero) data if you read a hole */
3893                 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3894                 return 0;
3895         }
3896
3897 }
3898
3899 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
3900 {
3901         int block;
3902         int page;
3903         yaffs_ExtendedTags tags;
3904         yaffs_BlockInfo *bi;
3905
3906         if (chunkId <= 0)
3907                 return;
3908
3909         dev->nDeletions++;
3910         block = chunkId / dev->param.nChunksPerBlock;
3911         page = chunkId % dev->param.nChunksPerBlock;
3912
3913
3914         if (!yaffs_CheckChunkBit(dev, block, page))
3915                 T(YAFFS_TRACE_VERIFY,
3916                         (TSTR("Deleting invalid chunk %d"TENDSTR),
3917                          chunkId));
3918
3919         bi = yaffs_GetBlockInfo(dev, block);
3920
3921         yaffs_UpdateOldestDirtySequence(dev, block, bi);
3922
3923         T(YAFFS_TRACE_DELETION,
3924           (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3925
3926         if (markNAND &&
3927             bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->param.isYaffs2) {
3928
3929                 yaffs_InitialiseTags(&tags);
3930
3931                 tags.chunkDeleted = 1;
3932
3933                 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3934                 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3935         } else {
3936                 dev->nUnmarkedDeletions++;
3937         }
3938
3939         /* Pull out of the management area.
3940          * If the whole block became dirty, this will kick off an erasure.
3941          */
3942         if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3943             bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3944             bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3945             bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3946                 dev->nFreeChunks++;
3947
3948                 yaffs_ClearChunkBit(dev, block, page);
3949
3950                 bi->pagesInUse--;
3951
3952                 if (bi->pagesInUse == 0 &&
3953                     !bi->hasShrinkHeader &&
3954                     bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3955                     bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3956                         yaffs_BlockBecameDirty(dev, block);
3957                 }
3958
3959         }
3960
3961 }
3962
3963 static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
3964                                         const __u8 *buffer, int nBytes,
3965                                         int useReserve)
3966 {
3967         /* Find old chunk Need to do this to get serial number
3968          * Write new one and patch into tree.
3969          * Invalidate old tags.
3970          */
3971
3972         int prevChunkId;
3973         yaffs_ExtendedTags prevTags;
3974
3975         int newChunkId;
3976         yaffs_ExtendedTags newTags;
3977
3978         yaffs_Device *dev = in->myDev;
3979
3980         yaffs_CheckGarbageCollection(dev,0);
3981
3982         /* Get the previous chunk at this location in the file if it exists.
3983          * If it does not exist then put a zero into the tree. This creates
3984          * the tnode now, rather than later when it is harder to clean up.
3985          */
3986         prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3987         if(prevChunkId < 1 &&
3988                 !yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0))
3989                 return 0;
3990
3991         /* Set up new tags */
3992         yaffs_InitialiseTags(&newTags);
3993
3994         newTags.chunkId = chunkInInode;
3995         newTags.objectId = in->objectId;
3996         newTags.serialNumber =
3997             (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
3998         newTags.byteCount = nBytes;
3999
4000         if (nBytes < 1 || nBytes > dev->param.totalBytesPerChunk) {
4001                 T(YAFFS_TRACE_ERROR,
4002                 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
4003                 YBUG();
4004         }
4005
4006
4007         newChunkId =
4008             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
4009                                               useReserve);
4010
4011         if (newChunkId > 0) {
4012                 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
4013
4014                 if (prevChunkId > 0)
4015                         yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
4016
4017                 yaffs_CheckFileSanity(in);
4018         }
4019         return newChunkId;
4020
4021 }
4022
4023 /* UpdateObjectHeader updates the header on NAND for an object.
4024  * If name is not NULL, then that new name is used.
4025  */
4026 int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
4027                              int isShrink, int shadows)
4028 {
4029
4030         yaffs_BlockInfo *bi;
4031
4032         yaffs_Device *dev = in->myDev;
4033
4034         int prevChunkId;
4035         int retVal = 0;
4036         int result = 0;
4037
4038         int newChunkId;
4039         yaffs_ExtendedTags newTags;
4040         yaffs_ExtendedTags oldTags;
4041         YCHAR *alias = NULL;
4042
4043         __u8 *buffer = NULL;
4044         YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
4045
4046         yaffs_ObjectHeader *oh = NULL;
4047
4048         yaffs_strcpy(oldName, _Y("silly old name"));
4049
4050
4051         if (!in->fake ||
4052                 in == dev->rootDir || /* The rootDir should also be saved */
4053                 force) {
4054
4055                 yaffs_CheckGarbageCollection(dev,0);
4056                 yaffs_CheckObjectDetailsLoaded(in);
4057
4058                 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
4059                 oh = (yaffs_ObjectHeader *) buffer;
4060
4061                 prevChunkId = in->hdrChunk;
4062
4063                 if (prevChunkId > 0) {
4064                         result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
4065                                                         buffer, &oldTags);
4066
4067                         yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
4068
4069                         memcpy(oldName, oh->name, sizeof(oh->name));
4070                 }
4071
4072                 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
4073
4074                 oh->type = in->variantType;
4075                 oh->yst_mode = in->yst_mode;
4076                 oh->shadowsObject = oh->inbandShadowsObject = shadows;
4077
4078 #ifdef CONFIG_YAFFS_WINCE
4079                 oh->win_atime[0] = in->win_atime[0];
4080                 oh->win_ctime[0] = in->win_ctime[0];
4081                 oh->win_mtime[0] = in->win_mtime[0];
4082                 oh->win_atime[1] = in->win_atime[1];
4083                 oh->win_ctime[1] = in->win_ctime[1];
4084                 oh->win_mtime[1] = in->win_mtime[1];
4085 #else
4086                 oh->yst_uid = in->yst_uid;
4087                 oh->yst_gid = in->yst_gid;
4088                 oh->yst_atime = in->yst_atime;
4089                 oh->yst_mtime = in->yst_mtime;
4090                 oh->yst_ctime = in->yst_ctime;
4091                 oh->yst_rdev = in->yst_rdev;
4092 #endif
4093                 if (in->parent)
4094                         oh->parentObjectId = in->parent->objectId;
4095                 else
4096                         oh->parentObjectId = 0;
4097
4098                 if (name && *name) {
4099                         memset(oh->name, 0, sizeof(oh->name));
4100                         yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
4101                 } else if (prevChunkId > 0)
4102                         memcpy(oh->name, oldName, sizeof(oh->name));
4103                 else
4104                         memset(oh->name, 0, sizeof(oh->name));
4105
4106                 oh->isShrink = isShrink;
4107
4108                 switch (in->variantType) {
4109                 case YAFFS_OBJECT_TYPE_UNKNOWN:
4110                         /* Should not happen */
4111                         break;
4112                 case YAFFS_OBJECT_TYPE_FILE:
4113                         oh->fileSize =
4114                             (oh->parentObjectId == YAFFS_OBJECTID_DELETED
4115                              || oh->parentObjectId ==
4116                              YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
4117                             fileVariant.fileSize;
4118                         break;
4119                 case YAFFS_OBJECT_TYPE_HARDLINK:
4120                         oh->equivalentObjectId =
4121                             in->variant.hardLinkVariant.equivalentObjectId;
4122                         break;
4123                 case YAFFS_OBJECT_TYPE_SPECIAL:
4124                         /* Do nothing */
4125                         break;
4126                 case YAFFS_OBJECT_TYPE_DIRECTORY:
4127                         /* Do nothing */
4128                         break;
4129                 case YAFFS_OBJECT_TYPE_SYMLINK:
4130                         alias = in->variant.symLinkVariant.alias;
4131                         if(!alias)
4132                                 alias = _Y("no alias");
4133                         yaffs_strncpy(oh->alias,
4134                                         alias,
4135                                       YAFFS_MAX_ALIAS_LENGTH);
4136                         oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
4137                         break;
4138                 }
4139
4140                 /* Tags */
4141                 yaffs_InitialiseTags(&newTags);
4142                 in->serial++;
4143                 newTags.chunkId = 0;
4144                 newTags.objectId = in->objectId;
4145                 newTags.serialNumber = in->serial;
4146
4147                 /* Add extra info for file header */
4148
4149                 newTags.extraHeaderInfoAvailable = 1;
4150                 newTags.extraParentObjectId = oh->parentObjectId;
4151                 newTags.extraFileLength = oh->fileSize;
4152                 newTags.extraIsShrinkHeader = oh->isShrink;
4153                 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
4154                 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
4155                 newTags.extraObjectType = in->variantType;
4156
4157                 yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
4158
4159                 /* Create new chunk in NAND */
4160                 newChunkId =
4161                     yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
4162                                                       (prevChunkId > 0) ? 1 : 0);
4163
4164                 if (newChunkId >= 0) {
4165
4166                         in->hdrChunk = newChunkId;
4167
4168                         if (prevChunkId > 0) {
4169                                 yaffs_DeleteChunk(dev, prevChunkId, 1,
4170                                                   __LINE__);
4171                         }
4172
4173                         if (!yaffs_ObjectHasCachedWriteData(in))
4174                                 in->dirty = 0;
4175
4176                         /* If this was a shrink, then mark the block that the chunk lives on */
4177                         if (isShrink) {
4178                                 bi = yaffs_GetBlockInfo(in->myDev,
4179                                         newChunkId / in->myDev->param.nChunksPerBlock);
4180                                 bi->hasShrinkHeader = 1;
4181                         }
4182
4183                 }
4184
4185                 retVal = newChunkId;
4186
4187         }
4188
4189         if (buffer)
4190                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
4191
4192         return retVal;
4193 }
4194
4195 /*------------------------ Short Operations Cache ----------------------------------------
4196  *   In many situations where there is no high level buffering (eg WinCE) a lot of
4197  *   reads might be short sequential reads, and a lot of writes may be short
4198  *   sequential writes. eg. scanning/writing a jpeg file.
4199  *   In these cases, a short read/write cache can provide a huge perfomance benefit
4200  *   with dumb-as-a-rock code.
4201  *   In Linux, the page cache provides read buffering aand the short op cache provides write
4202  *   buffering.
4203  *
4204  *   There are a limited number (~10) of cache chunks per device so that we don't
4205  *   need a very intelligent search.
4206  */
4207
4208 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
4209 {
4210         yaffs_Device *dev = obj->myDev;
4211         int i;
4212         yaffs_ChunkCache *cache;
4213         int nCaches = obj->myDev->param.nShortOpCaches;
4214
4215         for (i = 0; i < nCaches; i++) {
4216                 cache = &dev->srCache[i];
4217                 if (cache->object == obj &&
4218                     cache->dirty)
4219                         return 1;
4220         }
4221
4222         return 0;
4223 }
4224
4225
4226 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
4227 {
4228         yaffs_Device *dev = obj->myDev;
4229         int lowest = -99;       /* Stop compiler whining. */
4230         int i;
4231         yaffs_ChunkCache *cache;
4232         int chunkWritten = 0;
4233         int nCaches = obj->myDev->param.nShortOpCaches;
4234
4235         if (nCaches > 0) {
4236                 do {
4237                         cache = NULL;
4238
4239                         /* Find the dirty cache for this object with the lowest chunk id. */
4240                         for (i = 0; i < nCaches; i++) {
4241                                 if (dev->srCache[i].object == obj &&
4242                                     dev->srCache[i].dirty) {
4243                                         if (!cache
4244                                             || dev->srCache[i].chunkId <
4245                                             lowest) {
4246                                                 cache = &dev->srCache[i];
4247                                                 lowest = cache->chunkId;
4248                                         }
4249                                 }
4250                         }
4251
4252                         if (cache && !cache->locked) {
4253                                 /* Write it out and free it up */
4254
4255                                 chunkWritten =
4256                                     yaffs_WriteChunkDataToObject(cache->object,
4257                                                                  cache->chunkId,
4258                                                                  cache->data,
4259                                                                  cache->nBytes,
4260                                                                  1);
4261                                 cache->dirty = 0;
4262                                 cache->object = NULL;
4263                         }
4264
4265                 } while (cache && chunkWritten > 0);
4266
4267                 if (cache) {
4268                         /* Hoosterman, disk full while writing cache out. */
4269                         T(YAFFS_TRACE_ERROR,
4270                           (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
4271
4272                 }
4273         }
4274
4275 }
4276
4277 /*yaffs_FlushEntireDeviceCache(dev)
4278  *
4279  *
4280  */
4281
4282 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
4283 {
4284         yaffs_Object *obj;
4285         int nCaches = dev->param.nShortOpCaches;
4286         int i;
4287
4288         /* Find a dirty object in the cache and flush it...
4289          * until there are no further dirty objects.
4290          */
4291         do {
4292                 obj = NULL;
4293                 for (i = 0; i < nCaches && !obj; i++) {
4294                         if (dev->srCache[i].object &&
4295                             dev->srCache[i].dirty)
4296                                 obj = dev->srCache[i].object;
4297
4298                 }
4299                 if (obj)
4300                         yaffs_FlushFilesChunkCache(obj);
4301
4302         } while (obj);
4303
4304 }
4305
4306
4307 /* Grab us a cache chunk for use.
4308  * First look for an empty one.
4309  * Then look for the least recently used non-dirty one.
4310  * Then look for the least recently used dirty one...., flush and look again.
4311  */
4312 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
4313 {
4314         int i;
4315
4316         if (dev->param.nShortOpCaches > 0) {
4317                 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4318                         if (!dev->srCache[i].object)
4319                                 return &dev->srCache[i];
4320                 }
4321         }
4322
4323         return NULL;
4324 }
4325
4326 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
4327 {
4328         yaffs_ChunkCache *cache;
4329         yaffs_Object *theObj;
4330         int usage;
4331         int i;
4332         int pushout;
4333
4334         if (dev->param.nShortOpCaches > 0) {
4335                 /* Try find a non-dirty one... */
4336
4337                 cache = yaffs_GrabChunkCacheWorker(dev);
4338
4339                 if (!cache) {
4340                         /* They were all dirty, find the last recently used object and flush
4341                          * its cache, then  find again.
4342                          * NB what's here is not very accurate, we actually flush the object
4343                          * the last recently used page.
4344                          */
4345
4346                         /* With locking we can't assume we can use entry zero */
4347
4348                         theObj = NULL;
4349                         usage = -1;
4350                         cache = NULL;
4351                         pushout = -1;
4352
4353                         for (i = 0; i < dev->param.nShortOpCaches; i++) {
4354                                 if (dev->srCache[i].object &&
4355                                     !dev->srCache[i].locked &&
4356                                     (dev->srCache[i].lastUse < usage || !cache)) {
4357                                         usage = dev->srCache[i].lastUse;
4358                                         theObj = dev->srCache[i].object;
4359                                         cache = &dev->srCache[i];
4360                                         pushout = i;
4361                                 }
4362                         }
4363
4364                         if (!cache || cache->dirty) {
4365                                 /* Flush and try again */
4366                                 yaffs_FlushFilesChunkCache(theObj);
4367                                 cache = yaffs_GrabChunkCacheWorker(dev);
4368                         }
4369
4370                 }
4371                 return cache;
4372         } else
4373                 return NULL;
4374
4375 }
4376
4377 /* Find a cached chunk */
4378 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
4379                                               int chunkId)
4380 {
4381         yaffs_Device *dev = obj->myDev;
4382         int i;
4383         if (dev->param.nShortOpCaches > 0) {
4384                 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4385                         if (dev->srCache[i].object == obj &&
4386                             dev->srCache[i].chunkId == chunkId) {
4387                                 dev->cacheHits++;
4388
4389                                 return &dev->srCache[i];
4390                         }
4391                 }
4392         }
4393         return NULL;
4394 }
4395
4396 /* Mark the chunk for the least recently used algorithym */
4397 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
4398                                 int isAWrite)
4399 {
4400
4401         if (dev->param.nShortOpCaches > 0) {
4402                 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
4403                         /* Reset the cache usages */
4404                         int i;
4405                         for (i = 1; i < dev->param.nShortOpCaches; i++)
4406                                 dev->srCache[i].lastUse = 0;
4407
4408                         dev->srLastUse = 0;
4409                 }
4410
4411                 dev->srLastUse++;
4412
4413                 cache->lastUse = dev->srLastUse;
4414
4415                 if (isAWrite)
4416                         cache->dirty = 1;
4417         }
4418 }
4419
4420 /* Invalidate a single cache page.
4421  * Do this when a whole page gets written,
4422  * ie the short cache for this page is no longer valid.
4423  */
4424 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
4425 {
4426         if (object->myDev->param.nShortOpCaches > 0) {
4427                 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4428
4429                 if (cache)
4430                         cache->object = NULL;
4431         }
4432 }
4433
4434 /* Invalidate all the cache pages associated with this object
4435  * Do this whenever ther file is deleted or resized.
4436  */
4437 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
4438 {
4439         int i;
4440         yaffs_Device *dev = in->myDev;
4441
4442         if (dev->param.nShortOpCaches > 0) {
4443                 /* Invalidate it. */
4444                 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4445                         if (dev->srCache[i].object == in)
4446                                 dev->srCache[i].object = NULL;
4447                 }
4448         }
4449 }
4450
4451 /*--------------------- Checkpointing --------------------*/
4452
4453
4454 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
4455 {
4456         yaffs_CheckpointValidity cp;
4457
4458         memset(&cp, 0, sizeof(cp));
4459
4460         cp.structType = sizeof(cp);
4461         cp.magic = YAFFS_MAGIC;
4462         cp.version = YAFFS_CHECKPOINT_VERSION;
4463         cp.head = (head) ? 1 : 0;
4464
4465         return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
4466                 1 : 0;
4467 }
4468
4469 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4470 {
4471         yaffs_CheckpointValidity cp;
4472         int ok;
4473
4474         ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4475
4476         if (ok)
4477                 ok = (cp.structType == sizeof(cp)) &&
4478                      (cp.magic == YAFFS_MAGIC) &&
4479                      (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4480                      (cp.head == ((head) ? 1 : 0));
4481         return ok ? 1 : 0;
4482 }
4483
4484 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4485                                            yaffs_Device *dev)
4486 {
4487         cp->nErasedBlocks = dev->nErasedBlocks;
4488         cp->allocationBlock = dev->allocationBlock;
4489         cp->allocationPage = dev->allocationPage;
4490         cp->nFreeChunks = dev->nFreeChunks;
4491
4492         cp->nDeletedFiles = dev->nDeletedFiles;
4493         cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4494         cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4495         cp->sequenceNumber = dev->sequenceNumber;
4496
4497 }
4498
4499 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4500                                            yaffs_CheckpointDevice *cp)
4501 {
4502         dev->nErasedBlocks = cp->nErasedBlocks;
4503         dev->allocationBlock = cp->allocationBlock;
4504         dev->allocationPage = cp->allocationPage;
4505         dev->nFreeChunks = cp->nFreeChunks;
4506
4507         dev->nDeletedFiles = cp->nDeletedFiles;
4508         dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4509         dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4510         dev->sequenceNumber = cp->sequenceNumber;
4511 }
4512
4513
4514 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4515 {
4516         yaffs_CheckpointDevice cp;
4517         __u32 nBytes;
4518         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4519
4520         int ok;
4521
4522         /* Write device runtime values*/
4523         yaffs_DeviceToCheckpointDevice(&cp, dev);
4524         cp.structType = sizeof(cp);
4525
4526         ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4527
4528         /* Write block info */
4529         if (ok) {
4530                 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4531                 ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
4532         }
4533
4534         /* Write chunk bits */
4535         if (ok) {
4536                 nBytes = nBlocks * dev->chunkBitmapStride;
4537                 ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
4538         }
4539         return   ok ? 1 : 0;
4540
4541 }
4542
4543 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4544 {
4545         yaffs_CheckpointDevice cp;
4546         __u32 nBytes;
4547         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4548
4549         int ok;
4550
4551         ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4552         if (!ok)
4553                 return 0;
4554
4555         if (cp.structType != sizeof(cp))
4556                 return 0;
4557
4558
4559         yaffs_CheckpointDeviceToDevice(dev, &cp);
4560
4561         nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4562
4563         ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
4564
4565         if (!ok)
4566                 return 0;
4567         nBytes = nBlocks * dev->chunkBitmapStride;
4568
4569         ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
4570
4571         return ok ? 1 : 0;
4572 }
4573
4574 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4575                                            yaffs_Object *obj)
4576 {
4577
4578         cp->objectId = obj->objectId;
4579         cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4580         cp->hdrChunk = obj->hdrChunk;
4581         cp->variantType = obj->variantType;
4582         cp->deleted = obj->deleted;
4583         cp->softDeleted = obj->softDeleted;
4584         cp->unlinked = obj->unlinked;
4585         cp->fake = obj->fake;
4586         cp->renameAllowed = obj->renameAllowed;
4587         cp->unlinkAllowed = obj->unlinkAllowed;
4588         cp->serial = obj->serial;
4589         cp->nDataChunks = obj->nDataChunks;
4590
4591         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4592                 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4593         else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4594                 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4595 }
4596
4597 static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
4598 {
4599
4600         yaffs_Object *parent;
4601
4602         if (obj->variantType != cp->variantType) {
4603                 T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
4604                         TCONT("chunk %d does not match existing object type %d")
4605                         TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
4606                         obj->variantType));
4607                 return 0;
4608         }
4609
4610         obj->objectId = cp->objectId;
4611
4612         if (cp->parentId)
4613                 parent = yaffs_FindOrCreateObjectByNumber(
4614                                         obj->myDev,
4615                                         cp->parentId,
4616                                         YAFFS_OBJECT_TYPE_DIRECTORY);
4617         else
4618                 parent = NULL;
4619
4620         if (parent) {
4621                 if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4622                         T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
4623                                 TCONT(" chunk %d Parent type, %d, not directory")
4624                                 TENDSTR),
4625                                 cp->objectId, cp->parentId, cp->variantType,
4626                                 cp->hdrChunk, parent->variantType));
4627                         return 0;
4628                 }
4629                 yaffs_AddObjectToDirectory(parent, obj);
4630         }
4631
4632         obj->hdrChunk = cp->hdrChunk;
4633         obj->variantType = cp->variantType;
4634         obj->deleted = cp->deleted;
4635         obj->softDeleted = cp->softDeleted;
4636         obj->unlinked = cp->unlinked;
4637         obj->fake = cp->fake;
4638         obj->renameAllowed = cp->renameAllowed;
4639         obj->unlinkAllowed = cp->unlinkAllowed;
4640         obj->serial = cp->serial;
4641         obj->nDataChunks = cp->nDataChunks;
4642
4643         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4644                 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4645         else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4646                 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4647
4648         if (obj->hdrChunk > 0)
4649                 obj->lazyLoaded = 1;
4650         return 1;
4651 }
4652
4653
4654
4655 static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
4656                                         __u32 level, int chunkOffset)
4657 {
4658         int i;
4659         yaffs_Device *dev = in->myDev;
4660         int ok = 1;
4661         int tnodeSize = yaffs_CalcTnodeSize(dev);
4662
4663         if (tn) {
4664                 if (level > 0) {
4665
4666                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
4667                                 if (tn->internal[i]) {
4668                                         ok = yaffs_CheckpointTnodeWorker(in,
4669                                                         tn->internal[i],
4670                                                         level - 1,
4671                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4672                                 }
4673                         }
4674                 } else if (level == 0) {
4675                         __u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
4676                         ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
4677                         if (ok)
4678                                 ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
4679                 }
4680         }
4681
4682         return ok;
4683
4684 }
4685
4686 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4687 {
4688         __u32 endMarker = ~0;
4689         int ok = 1;
4690
4691         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4692                 ok = yaffs_CheckpointTnodeWorker(obj,
4693                                             obj->variant.fileVariant.top,
4694                                             obj->variant.fileVariant.topLevel,
4695                                             0);
4696                 if (ok)
4697                         ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
4698                                 sizeof(endMarker));
4699         }
4700
4701         return ok ? 1 : 0;
4702 }
4703
4704 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4705 {
4706         __u32 baseChunk;
4707         int ok = 1;
4708         yaffs_Device *dev = obj->myDev;
4709         yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4710         yaffs_Tnode *tn;
4711         int nread = 0;
4712         int tnodeSize = yaffs_CalcTnodeSize(dev);
4713
4714         ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4715
4716         while (ok && (~baseChunk)) {
4717                 nread++;
4718                 /* Read level 0 tnode */
4719
4720
4721                 tn = yaffs_GetTnodeRaw(dev);
4722                 if (tn)
4723                         ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
4724                 else
4725                         ok = 0;
4726
4727                 if (tn && ok)
4728                         ok = yaffs_AddOrFindLevel0Tnode(dev,
4729                                                         fileStructPtr,
4730                                                         baseChunk,
4731                                                         tn) ? 1 : 0;
4732
4733                 if (ok)
4734                         ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4735
4736         }
4737
4738         T(YAFFS_TRACE_CHECKPOINT, (
4739                 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4740                 nread, baseChunk, ok));
4741
4742         return ok ? 1 : 0;
4743 }
4744
4745
4746 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4747 {
4748         yaffs_Object *obj;
4749         yaffs_CheckpointObject cp;
4750         int i;
4751         int ok = 1;
4752         struct ylist_head *lh;
4753
4754
4755         /* Iterate through the objects in each hash entry,
4756          * dumping them to the checkpointing stream.
4757          */
4758
4759         for (i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++) {
4760                 ylist_for_each(lh, &dev->objectBucket[i].list) {
4761                         if (lh) {
4762                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
4763                                 if (!obj->deferedFree) {
4764                                         yaffs_ObjectToCheckpointObject(&cp, obj);
4765                                         cp.structType = sizeof(cp);
4766
4767                                         T(YAFFS_TRACE_CHECKPOINT, (
4768                                                 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %p" TENDSTR),
4769                                                 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, obj));
4770
4771                                         ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4772
4773                                         if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4774                                                 ok = yaffs_WriteCheckpointTnodes(obj);
4775                                 }
4776                         }
4777                 }
4778         }
4779
4780         /* Dump end of list */
4781         memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
4782         cp.structType = sizeof(cp);
4783
4784         if (ok)
4785                 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4786
4787         return ok ? 1 : 0;
4788 }
4789
4790 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4791 {
4792         yaffs_Object *obj;
4793         yaffs_CheckpointObject cp;
4794         int ok = 1;
4795         int done = 0;
4796         yaffs_Object *hardList = NULL;
4797
4798         while (ok && !done) {
4799                 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4800                 if (cp.structType != sizeof(cp)) {
4801                         T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
4802                                 cp.structType, (int)sizeof(cp), ok));
4803                         ok = 0;
4804                 }
4805
4806                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4807                         cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
4808
4809                 if (ok && cp.objectId == ~0)
4810                         done = 1;
4811                 else if (ok) {
4812                         obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
4813                         if (obj) {
4814                                 ok = yaffs_CheckpointObjectToObject(obj, &cp);
4815                                 if (!ok)
4816                                         break;
4817                                 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4818                                         ok = yaffs_ReadCheckpointTnodes(obj);
4819                                 } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4820                                         obj->hardLinks.next =
4821                                                 (struct ylist_head *) hardList;
4822                                         hardList = obj;
4823                                 }
4824                         } else
4825                                 ok = 0;
4826                 }
4827         }
4828
4829         if (ok)
4830                 yaffs_HardlinkFixup(dev, hardList);
4831
4832         return ok ? 1 : 0;
4833 }
4834
4835 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4836 {
4837         __u32 checkpointSum;
4838         int ok;
4839
4840         yaffs_GetCheckpointSum(dev, &checkpointSum);
4841
4842         ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
4843
4844         if (!ok)
4845                 return 0;
4846
4847         return 1;
4848 }
4849
4850 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4851 {
4852         __u32 checkpointSum0;
4853         __u32 checkpointSum1;
4854         int ok;
4855
4856         yaffs_GetCheckpointSum(dev, &checkpointSum0);
4857
4858         ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4859
4860         if (!ok)
4861                 return 0;
4862
4863         if (checkpointSum0 != checkpointSum1)
4864                 return 0;
4865
4866         return 1;
4867 }
4868
4869
4870 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4871 {
4872         int ok = 1;
4873
4874         if (dev->param.skipCheckpointWrite || !dev->param.isYaffs2) {
4875                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
4876                 ok = 0;
4877         }
4878
4879         if (ok)
4880                 ok = yaffs_CheckpointOpen(dev, 1);
4881
4882         if (ok) {
4883                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4884                 ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
4885         }
4886         if (ok) {
4887                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
4888                 ok = yaffs_WriteCheckpointDevice(dev);
4889         }
4890         if (ok) {
4891                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
4892                 ok = yaffs_WriteCheckpointObjects(dev);
4893         }
4894         if (ok) {
4895                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4896                 ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
4897         }
4898
4899         if (ok)
4900                 ok = yaffs_WriteCheckpointSum(dev);
4901
4902         if (!yaffs_CheckpointClose(dev))
4903                 ok = 0;
4904
4905         if (ok)
4906                 dev->isCheckpointed = 1;
4907         else
4908                 dev->isCheckpointed = 0;
4909
4910         return dev->isCheckpointed;
4911 }
4912
4913 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4914 {
4915         int ok = 1;
4916
4917         if (dev->param.skipCheckpointRead || !dev->param.isYaffs2) {
4918                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
4919                 ok = 0;
4920         }
4921
4922         if (ok)
4923                 ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
4924
4925         if (ok) {
4926                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4927                 ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
4928         }
4929         if (ok) {
4930                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
4931                 ok = yaffs_ReadCheckpointDevice(dev);
4932         }
4933         if (ok) {
4934                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
4935                 ok = yaffs_ReadCheckpointObjects(dev);
4936         }
4937         if (ok) {
4938                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4939                 ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
4940         }
4941
4942         if (ok) {
4943                 ok = yaffs_ReadCheckpointSum(dev);
4944                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
4945         }
4946
4947         if (!yaffs_CheckpointClose(dev))
4948                 ok = 0;
4949
4950         if (ok)
4951                 dev->isCheckpointed = 1;
4952         else
4953                 dev->isCheckpointed = 0;
4954
4955         return ok ? 1 : 0;
4956
4957 }
4958
4959 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4960 {
4961         if (dev->isCheckpointed ||
4962                         dev->blocksInCheckpoint > 0) {
4963                 dev->isCheckpointed = 0;
4964                 yaffs_CheckpointInvalidateStream(dev);
4965         }
4966         if (dev->param.markSuperBlockDirty)
4967                 dev->param.markSuperBlockDirty(dev);
4968 }
4969
4970
4971 int yaffs_CheckpointSave(yaffs_Device *dev)
4972 {
4973
4974         T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4975
4976         yaffs_VerifyObjects(dev);
4977         yaffs_VerifyBlocks(dev);
4978         yaffs_VerifyFreeChunks(dev);
4979
4980         if (!dev->isCheckpointed) {
4981                 yaffs_InvalidateCheckpoint(dev);
4982                 yaffs_WriteCheckpointData(dev);
4983         }
4984
4985         T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4986
4987         return dev->isCheckpointed;
4988 }
4989
4990 int yaffs_CheckpointRestore(yaffs_Device *dev)
4991 {
4992         int retval;
4993         T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4994
4995         retval = yaffs_ReadCheckpointData(dev);
4996
4997         if (dev->isCheckpointed) {
4998                 yaffs_VerifyObjects(dev);
4999                 yaffs_VerifyBlocks(dev);
5000                 yaffs_VerifyFreeChunks(dev);
5001         }
5002
5003         T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
5004
5005         return retval;
5006 }
5007
5008 /*--------------------- File read/write ------------------------
5009  * Read and write have very similar structures.
5010  * In general the read/write has three parts to it
5011  * An incomplete chunk to start with (if the read/write is not chunk-aligned)
5012  * Some complete chunks
5013  * An incomplete chunk to end off with
5014  *
5015  * Curve-balls: the first chunk might also be the last chunk.
5016  */
5017
5018 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
5019                         int nBytes)
5020 {
5021
5022         int chunk;
5023         __u32 start;
5024         int nToCopy;
5025         int n = nBytes;
5026         int nDone = 0;
5027         yaffs_ChunkCache *cache;
5028
5029         yaffs_Device *dev;
5030
5031         dev = in->myDev;
5032
5033         while (n > 0) {
5034                 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
5035                 /* start = offset % dev->nDataBytesPerChunk; */
5036                 yaffs_AddrToChunk(dev, offset, &chunk, &start);
5037                 chunk++;
5038
5039                 /* OK now check for the curveball where the start and end are in
5040                  * the same chunk.
5041                  */
5042                 if ((start + n) < dev->nDataBytesPerChunk)
5043                         nToCopy = n;
5044                 else
5045                         nToCopy = dev->nDataBytesPerChunk - start;
5046
5047                 cache = yaffs_FindChunkCache(in, chunk);
5048
5049                 /* If the chunk is already in the cache or it is less than a whole chunk
5050                  * or we're using inband tags then use the cache (if there is caching)
5051                  * else bypass the cache.
5052                  */
5053                 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
5054                         if (dev->param.nShortOpCaches > 0) {
5055
5056                                 /* If we can't find the data in the cache, then load it up. */
5057
5058                                 if (!cache) {
5059                                         cache = yaffs_GrabChunkCache(in->myDev);
5060                                         cache->object = in;
5061                                         cache->chunkId = chunk;
5062                                         cache->dirty = 0;
5063                                         cache->locked = 0;
5064                                         yaffs_ReadChunkDataFromObject(in, chunk,
5065                                                                       cache->
5066                                                                       data);
5067                                         cache->nBytes = 0;
5068                                 }
5069
5070                                 yaffs_UseChunkCache(dev, cache, 0);
5071
5072                                 cache->locked = 1;
5073
5074
5075                                 memcpy(buffer, &cache->data[start], nToCopy);
5076
5077                                 cache->locked = 0;
5078                         } else {
5079                                 /* Read into the local buffer then copy..*/
5080
5081                                 __u8 *localBuffer =
5082                                     yaffs_GetTempBuffer(dev, __LINE__);
5083                                 yaffs_ReadChunkDataFromObject(in, chunk,
5084                                                               localBuffer);
5085
5086                                 memcpy(buffer, &localBuffer[start], nToCopy);
5087
5088
5089                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
5090                                                         __LINE__);
5091                         }
5092
5093                 } else {
5094
5095                         /* A full chunk. Read directly into the supplied buffer. */
5096                         yaffs_ReadChunkDataFromObject(in, chunk, buffer);
5097
5098                 }
5099
5100                 n -= nToCopy;
5101                 offset += nToCopy;
5102                 buffer += nToCopy;
5103                 nDone += nToCopy;
5104
5105         }
5106
5107         return nDone;
5108 }
5109
5110 int yaffs_DoWriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
5111                         int nBytes, int writeThrough)
5112 {
5113
5114         int chunk;
5115         __u32 start;
5116         int nToCopy;
5117         int n = nBytes;
5118         int nDone = 0;
5119         int nToWriteBack;
5120         int startOfWrite = offset;
5121         int chunkWritten = 0;
5122         __u32 nBytesRead;
5123         __u32 chunkStart;
5124
5125         yaffs_Device *dev;
5126
5127         dev = in->myDev;
5128
5129         while (n > 0 && chunkWritten >= 0) {
5130                 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
5131                 /* start = offset % dev->nDataBytesPerChunk; */
5132                 yaffs_AddrToChunk(dev, offset, &chunk, &start);
5133
5134                 if (chunk * dev->nDataBytesPerChunk + start != offset ||
5135                                 start >= dev->nDataBytesPerChunk) {
5136                         T(YAFFS_TRACE_ERROR, (
5137                            TSTR("AddrToChunk of offset %d gives chunk %d start %d"
5138                            TENDSTR),
5139                            (int)offset, chunk, start));
5140                 }
5141                 chunk++;
5142
5143                 /* OK now check for the curveball where the start and end are in
5144                  * the same chunk.
5145                  */
5146
5147                 if ((start + n) < dev->nDataBytesPerChunk) {
5148                         nToCopy = n;
5149
5150                         /* Now folks, to calculate how many bytes to write back....
5151                          * If we're overwriting and not writing to then end of file then
5152                          * we need to write back as much as was there before.
5153                          */
5154
5155                         chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
5156
5157                         if (chunkStart > in->variant.fileVariant.fileSize)
5158                                 nBytesRead = 0; /* Past end of file */
5159                         else
5160                                 nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
5161
5162                         if (nBytesRead > dev->nDataBytesPerChunk)
5163                                 nBytesRead = dev->nDataBytesPerChunk;
5164
5165                         nToWriteBack =
5166                             (nBytesRead >
5167                              (start + n)) ? nBytesRead : (start + n);
5168
5169                         if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
5170                                 YBUG();
5171
5172                 } else {
5173                         nToCopy = dev->nDataBytesPerChunk - start;
5174                         nToWriteBack = dev->nDataBytesPerChunk;
5175                 }
5176
5177                 if (nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
5178                         /* An incomplete start or end chunk (or maybe both start and end chunk),
5179                          * or we're using inband tags, so we want to use the cache buffers.
5180                          */
5181                         if (dev->param.nShortOpCaches > 0) {
5182                                 yaffs_ChunkCache *cache;
5183                                 /* If we can't find the data in the cache, then load the cache */
5184                                 cache = yaffs_FindChunkCache(in, chunk);
5185
5186                                 if (!cache
5187                                     && yaffs_CheckSpaceForAllocation(dev, 1)) {
5188                                         cache = yaffs_GrabChunkCache(dev);
5189                                         cache->object = in;
5190                                         cache->chunkId = chunk;
5191                                         cache->dirty = 0;
5192                                         cache->locked = 0;
5193                                         yaffs_ReadChunkDataFromObject(in, chunk,
5194                                                                       cache->data);
5195                                 } else if (cache &&
5196                                         !cache->dirty &&
5197                                         !yaffs_CheckSpaceForAllocation(dev, 1)) {
5198                                         /* Drop the cache if it was a read cache item and
5199                                          * no space check has been made for it.
5200                                          */
5201                                          cache = NULL;
5202                                 }
5203
5204                                 if (cache) {
5205                                         yaffs_UseChunkCache(dev, cache, 1);
5206                                         cache->locked = 1;
5207
5208
5209                                         memcpy(&cache->data[start], buffer,
5210                                                nToCopy);
5211
5212
5213                                         cache->locked = 0;
5214                                         cache->nBytes = nToWriteBack;
5215
5216                                         if (writeThrough) {
5217                                                 chunkWritten =
5218                                                     yaffs_WriteChunkDataToObject
5219                                                     (cache->object,
5220                                                      cache->chunkId,
5221                                                      cache->data, cache->nBytes,
5222                                                      1);
5223                                                 cache->dirty = 0;
5224                                         }
5225
5226                                 } else {
5227                                         chunkWritten = -1;      /* fail the write */
5228                                 }
5229                         } else {
5230                                 /* An incomplete start or end chunk (or maybe both start and end chunk)
5231                                  * Read into the local buffer then copy, then copy over and write back.
5232                                  */
5233
5234                                 __u8 *localBuffer =
5235                                     yaffs_GetTempBuffer(dev, __LINE__);
5236
5237                                 yaffs_ReadChunkDataFromObject(in, chunk,
5238                                                               localBuffer);
5239
5240
5241
5242                                 memcpy(&localBuffer[start], buffer, nToCopy);
5243
5244                                 chunkWritten =
5245                                     yaffs_WriteChunkDataToObject(in, chunk,
5246                                                                  localBuffer,
5247                                                                  nToWriteBack,
5248                                                                  0);
5249
5250                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
5251                                                         __LINE__);
5252
5253                         }
5254
5255                 } else {
5256                         /* A full chunk. Write directly from the supplied buffer. */
5257
5258
5259
5260                         chunkWritten =
5261                             yaffs_WriteChunkDataToObject(in, chunk, buffer,
5262                                                          dev->nDataBytesPerChunk,
5263                                                          0);
5264
5265                         /* Since we've overwritten the cached data, we better invalidate it. */
5266                         yaffs_InvalidateChunkCache(in, chunk);
5267                 }
5268
5269                 if (chunkWritten >= 0) {
5270                         n -= nToCopy;
5271                         offset += nToCopy;
5272                         buffer += nToCopy;
5273                         nDone += nToCopy;
5274                 }
5275
5276         }
5277
5278         /* Update file object */
5279
5280         if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
5281                 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
5282
5283         in->dirty = 1;
5284
5285         return nDone;
5286 }
5287
5288 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
5289                         int nBytes, int writeThrough)
5290 {
5291         yaffs_HandleHole(in,offset);
5292         return yaffs_DoWriteDataToFile(in,buffer,offset,nBytes,writeThrough);
5293 }
5294
5295
5296
5297 /* ---------------------- File resizing stuff ------------------ */
5298
5299 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
5300 {
5301
5302         yaffs_Device *dev = in->myDev;
5303         int oldFileSize = in->variant.fileVariant.fileSize;
5304
5305         int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
5306
5307         int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
5308             dev->nDataBytesPerChunk;
5309         int i;
5310         int chunkId;
5311
5312         /* Delete backwards so that we don't end up with holes if
5313          * power is lost part-way through the operation.
5314          */
5315         for (i = lastDel; i >= startDel; i--) {
5316                 /* NB this could be optimised somewhat,
5317                  * eg. could retrieve the tags and write them without
5318                  * using yaffs_DeleteChunk
5319                  */
5320
5321                 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
5322                 if (chunkId > 0) {
5323                         if (chunkId <
5324                             (dev->internalStartBlock * dev->param.nChunksPerBlock)
5325                             || chunkId >=
5326                             ((dev->internalEndBlock +
5327                               1) * dev->param.nChunksPerBlock)) {
5328                                 T(YAFFS_TRACE_ALWAYS,
5329                                   (TSTR("Found daft chunkId %d for %d" TENDSTR),
5330                                    chunkId, i));
5331                         } else {
5332                                 in->nDataChunks--;
5333                                 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
5334                         }
5335                 }
5336         }
5337
5338 }
5339
5340
5341 static void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize)
5342 {
5343         int newFullChunks;
5344         __u32 newSizeOfPartialChunk;
5345         yaffs_Device *dev = obj->myDev;
5346
5347         yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
5348
5349         yaffs_PruneResizedChunks(obj, newSize);
5350
5351         if (newSizeOfPartialChunk != 0) {
5352                 int lastChunk = 1 + newFullChunks;
5353                 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
5354
5355                 /* Got to read and rewrite the last chunk with its new size and zero pad */
5356                 yaffs_ReadChunkDataFromObject(obj, lastChunk, localBuffer);
5357                 memset(localBuffer + newSizeOfPartialChunk, 0,
5358                         dev->nDataBytesPerChunk - newSizeOfPartialChunk);
5359
5360                 yaffs_WriteChunkDataToObject(obj, lastChunk, localBuffer,
5361                                              newSizeOfPartialChunk, 1);
5362
5363                 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
5364         }
5365
5366         obj->variant.fileVariant.fileSize = newSize;
5367
5368         yaffs_PruneFileStructure(dev, &obj->variant.fileVariant);
5369 }
5370
5371
5372 static int yaffs_HandleHole(yaffs_Object *obj, loff_t newSize)
5373 {
5374         /* if newsSize > oldFileSize.
5375          * We're going to be writing a hole.
5376          * If the hole is small then write zeros otherwise write a start of hole marker.
5377          */
5378
5379
5380         loff_t oldFileSize;
5381         int increase;
5382         int smallHole   ;
5383         int result = YAFFS_OK;
5384         yaffs_Device *dev = NULL;
5385
5386         __u8 *localBuffer = NULL;
5387
5388         int smallIncreaseOk = 0;
5389
5390         if(!obj)
5391                 return YAFFS_FAIL;
5392
5393         if(obj->variantType != YAFFS_OBJECT_TYPE_FILE)
5394                 return YAFFS_FAIL;
5395
5396         dev = obj->myDev;
5397
5398         /* Bail out if not yaffs2 mode */
5399         if(!dev->param.isYaffs2)
5400                 return YAFFS_OK;
5401
5402         oldFileSize = obj->variant.fileVariant.fileSize;
5403
5404         if (newSize <= oldFileSize)
5405                 return YAFFS_OK;
5406
5407         increase = newSize - oldFileSize;
5408
5409         if(increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->nDataBytesPerChunk &&
5410                 yaffs_CheckSpaceForAllocation(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
5411                 smallHole = 1;
5412         else
5413                 smallHole = 0;
5414
5415         if(smallHole)
5416                 localBuffer= yaffs_GetTempBuffer(dev, __LINE__);
5417
5418         if(localBuffer){
5419                 /* fill hole with zero bytes */
5420                 int pos = oldFileSize;
5421                 int thisWrite;
5422                 int written;
5423                 memset(localBuffer,0,dev->nDataBytesPerChunk);
5424                 smallIncreaseOk = 1;
5425
5426                 while(increase > 0 && smallIncreaseOk){
5427                         thisWrite = increase;
5428                         if(thisWrite > dev->nDataBytesPerChunk)
5429                                 thisWrite = dev->nDataBytesPerChunk;
5430                         written = yaffs_DoWriteDataToFile(obj,localBuffer,pos,thisWrite,0);
5431                         if(written == thisWrite){
5432                                 pos += thisWrite;
5433                                 increase -= thisWrite;
5434                         } else
5435                                 smallIncreaseOk = 0;
5436                 }
5437
5438                 yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
5439
5440                 /* If we were out of space then reverse any chunks we've added */
5441                 if(!smallIncreaseOk)
5442                         yaffs_ResizeDown(obj, oldFileSize);
5443         }
5444
5445         if (!smallIncreaseOk &&
5446                 obj->parent &&
5447                 obj->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5448                 obj->parent->objectId != YAFFS_OBJECTID_DELETED){
5449                 /* Write a hole start header with the old file size */
5450                 yaffs_UpdateObjectHeader(obj, NULL, 0,1,0);
5451         }
5452
5453         return result;
5454
5455 }
5456
5457 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
5458 {
5459         yaffs_Device *dev = in->myDev;
5460         int oldFileSize = in->variant.fileVariant.fileSize;
5461
5462         yaffs_FlushFilesChunkCache(in);
5463         yaffs_InvalidateWholeChunkCache(in);
5464
5465         yaffs_CheckGarbageCollection(dev,0);
5466
5467         if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
5468                 return YAFFS_FAIL;
5469
5470         if (newSize == oldFileSize)
5471                 return YAFFS_OK;
5472
5473         if(newSize > oldFileSize){
5474                 yaffs_HandleHole(in,newSize);
5475                 in->variant.fileVariant.fileSize = newSize;
5476         } else {
5477                 /* newSize < oldFileSize */
5478                 yaffs_ResizeDown(in, newSize);
5479         }
5480
5481         /* Write a new object header to reflect the resize.
5482          * show we've shrunk the file, if need be
5483          * Do this only if the file is not in the deleted directories
5484          * and is not shadowed.
5485          */
5486         if (in->parent &&
5487             !in->isShadowed &&
5488             in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5489             in->parent->objectId != YAFFS_OBJECTID_DELETED)
5490                 yaffs_UpdateObjectHeader(in, NULL, 0,0,0);
5491
5492
5493         return YAFFS_OK;
5494 }
5495
5496 loff_t yaffs_GetFileSize(yaffs_Object *obj)
5497 {
5498         YCHAR *alias = NULL;
5499         obj = yaffs_GetEquivalentObject(obj);
5500
5501         switch (obj->variantType) {
5502         case YAFFS_OBJECT_TYPE_FILE:
5503                 return obj->variant.fileVariant.fileSize;
5504         case YAFFS_OBJECT_TYPE_SYMLINK:
5505                 alias = obj->variant.symLinkVariant.alias;
5506                 if(!alias)
5507                         return 0;
5508                 return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
5509         default:
5510                 return 0;
5511         }
5512 }
5513
5514
5515
5516 int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
5517 {
5518         int retVal;
5519         if (in->dirty) {
5520                 yaffs_FlushFilesChunkCache(in);
5521                 if(dataSync) /* Only sync data */
5522                         retVal=YAFFS_OK;
5523                 else {
5524                         if (updateTime) {
5525 #ifdef CONFIG_YAFFS_WINCE
5526                                 yfsd_WinFileTimeNow(in->win_mtime);
5527 #else
5528
5529                                 in->yst_mtime = Y_CURRENT_TIME;
5530
5531 #endif
5532                         }
5533
5534                         retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5535                                 0) ? YAFFS_OK : YAFFS_FAIL;
5536                 }
5537         } else {
5538                 retVal = YAFFS_OK;
5539         }
5540
5541         return retVal;
5542
5543 }
5544
5545 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
5546 {
5547
5548         /* First off, invalidate the file's data in the cache, without flushing. */
5549         yaffs_InvalidateWholeChunkCache(in);
5550
5551         if (in->myDev->param.isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5552                 /* Move to the unlinked directory so we have a record that it was deleted. */
5553                 yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
5554
5555         }
5556
5557         yaffs_RemoveObjectFromDirectory(in);
5558         yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
5559         in->hdrChunk = 0;
5560
5561         yaffs_FreeObject(in);
5562         return YAFFS_OK;
5563
5564 }
5565
5566 /* yaffs_DeleteFile deletes the whole file data
5567  * and the inode associated with the file.
5568  * It does not delete the links associated with the file.
5569  */
5570 static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
5571 {
5572
5573         int retVal;
5574         int immediateDeletion = 0;
5575         yaffs_Device *dev = in->myDev;
5576
5577         if (!in->myInode)
5578                 immediateDeletion = 1;
5579
5580         if (immediateDeletion) {
5581                 retVal =
5582                     yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5583                                            _Y("deleted"), 0, 0);
5584                 T(YAFFS_TRACE_TRACING,
5585                   (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5586                    in->objectId));
5587                 in->deleted = 1;
5588                 in->myDev->nDeletedFiles++;
5589                 if (dev->param.disableSoftDelete || dev->param.isYaffs2)
5590                         yaffs_ResizeFile(in, 0);
5591                 yaffs_SoftDeleteFile(in);
5592         } else {
5593                 retVal =
5594                     yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5595                                            _Y("unlinked"), 0, 0);
5596         }
5597
5598
5599         return retVal;
5600 }
5601
5602 int yaffs_DeleteFile(yaffs_Object *in)
5603 {
5604         int retVal = YAFFS_OK;
5605         int deleted = in->deleted;
5606         yaffs_Device *dev = in->myDev;
5607
5608         if (dev->param.disableSoftDelete || dev->param.isYaffs2)
5609                 yaffs_ResizeFile(in, 0);
5610
5611         if (in->nDataChunks > 0) {
5612                 /* Use soft deletion if there is data in the file.
5613                  * That won't be the case if it has been resized to zero.
5614                  */
5615                 if (!in->unlinked)
5616                         retVal = yaffs_UnlinkFileIfNeeded(in);
5617
5618                 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5619                         in->deleted = 1;
5620                         deleted = 1;
5621                         in->myDev->nDeletedFiles++;
5622                         yaffs_SoftDeleteFile(in);
5623                 }
5624                 return deleted ? YAFFS_OK : YAFFS_FAIL;
5625         } else {
5626                 /* The file has no data chunks so we toss it immediately */
5627                 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5628                 in->variant.fileVariant.top = NULL;
5629                 yaffs_DoGenericObjectDeletion(in);
5630
5631                 return YAFFS_OK;
5632         }
5633 }
5634
5635 static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
5636 {
5637         return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
5638                 !(ylist_empty(&obj->variant.directoryVariant.children));
5639 }
5640
5641 static int yaffs_DeleteDirectory(yaffs_Object *obj)
5642 {
5643         /* First check that the directory is empty. */
5644         if (yaffs_IsNonEmptyDirectory(obj))
5645                 return YAFFS_FAIL;
5646
5647         return yaffs_DoGenericObjectDeletion(obj);
5648 }
5649
5650 static int yaffs_DeleteSymLink(yaffs_Object *in)
5651 {
5652         if(in->variant.symLinkVariant.alias)
5653                 YFREE(in->variant.symLinkVariant.alias);
5654         in->variant.symLinkVariant.alias=NULL;
5655
5656         return yaffs_DoGenericObjectDeletion(in);
5657 }
5658
5659 static int yaffs_DeleteHardLink(yaffs_Object *in)
5660 {
5661         /* remove this hardlink from the list assocaited with the equivalent
5662          * object
5663          */
5664         ylist_del_init(&in->hardLinks);
5665         return yaffs_DoGenericObjectDeletion(in);
5666 }
5667
5668 int yaffs_DeleteObject(yaffs_Object *obj)
5669 {
5670 int retVal = -1;
5671         switch (obj->variantType) {
5672         case YAFFS_OBJECT_TYPE_FILE:
5673                 retVal = yaffs_DeleteFile(obj);
5674                 break;
5675         case YAFFS_OBJECT_TYPE_DIRECTORY:
5676                 if(!ylist_empty(&obj->variant.directoryVariant.dirty)){
5677                         T(YAFFS_TRACE_BACKGROUND, (TSTR("Remove object %d from dirty directories" TENDSTR),obj->objectId));
5678                         ylist_del_init(&obj->variant.directoryVariant.dirty);
5679                 }
5680                 return yaffs_DeleteDirectory(obj);
5681                 break;
5682         case YAFFS_OBJECT_TYPE_SYMLINK:
5683                 retVal = yaffs_DeleteSymLink(obj);
5684                 break;
5685         case YAFFS_OBJECT_TYPE_HARDLINK:
5686                 retVal = yaffs_DeleteHardLink(obj);
5687                 break;
5688         case YAFFS_OBJECT_TYPE_SPECIAL:
5689                 retVal = yaffs_DoGenericObjectDeletion(obj);
5690                 break;
5691         case YAFFS_OBJECT_TYPE_UNKNOWN:
5692                 retVal = 0;
5693                 break;          /* should not happen. */
5694         }
5695
5696         return retVal;
5697 }
5698
5699 static int yaffs_UnlinkWorker(yaffs_Object *obj)
5700 {
5701
5702         int immediateDeletion = 0;
5703
5704         if (!obj->myInode)
5705                 immediateDeletion = 1;
5706
5707         if(obj)
5708                 yaffs_UpdateParent(obj->parent);
5709
5710         if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5711                 return yaffs_DeleteHardLink(obj);
5712         } else if (!ylist_empty(&obj->hardLinks)) {
5713                 /* Curve ball: We're unlinking an object that has a hardlink.
5714                  *
5715                  * This problem arises because we are not strictly following
5716                  * The Linux link/inode model.
5717                  *
5718                  * We can't really delete the object.
5719                  * Instead, we do the following:
5720                  * - Select a hardlink.
5721                  * - Unhook it from the hard links
5722                  * - Move it from its parent directory (so that the rename can work)
5723                  * - Rename the object to the hardlink's name.
5724                  * - Delete the hardlink
5725                  */
5726
5727                 yaffs_Object *hl;
5728                 yaffs_Object *parent;
5729                 int retVal;
5730                 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5731
5732                 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5733
5734                 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5735                 parent = hl->parent;
5736
5737                 ylist_del_init(&hl->hardLinks);
5738
5739                 yaffs_AddObjectToDirectory(obj->myDev->unlinkedDir, hl);
5740
5741                 retVal = yaffs_ChangeObjectName(obj,parent, name, 0, 0);
5742
5743                 if (retVal == YAFFS_OK)
5744                         retVal = yaffs_DoGenericObjectDeletion(hl);
5745
5746                 return retVal;
5747
5748         } else if (immediateDeletion) {
5749                 switch (obj->variantType) {
5750                 case YAFFS_OBJECT_TYPE_FILE:
5751                         return yaffs_DeleteFile(obj);
5752                         break;
5753                 case YAFFS_OBJECT_TYPE_DIRECTORY:
5754                         ylist_del_init(&obj->variant.directoryVariant.dirty);
5755                         return yaffs_DeleteDirectory(obj);
5756                         break;
5757                 case YAFFS_OBJECT_TYPE_SYMLINK:
5758                         return yaffs_DeleteSymLink(obj);
5759                         break;
5760                 case YAFFS_OBJECT_TYPE_SPECIAL:
5761                         return yaffs_DoGenericObjectDeletion(obj);
5762                         break;
5763                 case YAFFS_OBJECT_TYPE_HARDLINK:
5764                 case YAFFS_OBJECT_TYPE_UNKNOWN:
5765                 default:
5766                         return YAFFS_FAIL;
5767                 }
5768         } else if(yaffs_IsNonEmptyDirectory(obj))
5769                 return YAFFS_FAIL;
5770         else
5771                 return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
5772                                            _Y("unlinked"), 0, 0);
5773 }
5774
5775
5776 static int yaffs_UnlinkObject(yaffs_Object *obj)
5777 {
5778
5779         if (obj && obj->unlinkAllowed)
5780                 return yaffs_UnlinkWorker(obj);
5781
5782         return YAFFS_FAIL;
5783
5784 }
5785 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
5786 {
5787         yaffs_Object *obj;
5788
5789         obj = yaffs_FindObjectByName(dir, name);
5790         return yaffs_UnlinkObject(obj);
5791 }
5792
5793 /*----------------------- Initialisation Scanning ---------------------- */
5794
5795 static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
5796                                 int backwardScanning)
5797 {
5798         yaffs_Object *obj;
5799
5800         if (!backwardScanning) {
5801                 /* Handle YAFFS1 forward scanning case
5802                  * For YAFFS1 we always do the deletion
5803                  */
5804
5805         } else {
5806                 /* Handle YAFFS2 case (backward scanning)
5807                  * If the shadowed object exists then ignore.
5808                  */
5809                 obj = yaffs_FindObjectByNumber(dev, objId);
5810                 if(obj)
5811                         return;
5812         }
5813
5814         /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5815          * We put it in unlinked dir to be cleaned up after the scanning
5816          */
5817         obj =
5818             yaffs_FindOrCreateObjectByNumber(dev, objId,
5819                                              YAFFS_OBJECT_TYPE_FILE);
5820         if (!obj)
5821                 return;
5822         obj->isShadowed = 1;
5823         yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5824         obj->variant.fileVariant.shrinkSize = 0;
5825         obj->valid = 1;         /* So that we don't read any other info for this file */
5826
5827 }
5828
5829 typedef struct {
5830         int seq;
5831         int block;
5832 } yaffs_BlockIndex;
5833
5834
5835 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5836 {
5837         yaffs_Object *hl;
5838         yaffs_Object *in;
5839
5840         while (hardList) {
5841                 hl = hardList;
5842                 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5843
5844                 in = yaffs_FindObjectByNumber(dev,
5845                                               hl->variant.hardLinkVariant.
5846                                               equivalentObjectId);
5847
5848                 if (in) {
5849                         /* Add the hardlink pointers */
5850                         hl->variant.hardLinkVariant.equivalentObject = in;
5851                         ylist_add(&hl->hardLinks, &in->hardLinks);
5852                 } else {
5853                         /* Todo Need to report/handle this better.
5854                          * Got a problem... hardlink to a non-existant object
5855                          */
5856                         hl->variant.hardLinkVariant.equivalentObject = NULL;
5857                         YINIT_LIST_HEAD(&hl->hardLinks);
5858
5859                 }
5860         }
5861 }
5862
5863
5864
5865
5866
5867 static int ybicmp(const void *a, const void *b)
5868 {
5869         register int aseq = ((yaffs_BlockIndex *)a)->seq;
5870         register int bseq = ((yaffs_BlockIndex *)b)->seq;
5871         register int ablock = ((yaffs_BlockIndex *)a)->block;
5872         register int bblock = ((yaffs_BlockIndex *)b)->block;
5873         if (aseq == bseq)
5874                 return ablock - bblock;
5875         else
5876                 return aseq - bseq;
5877 }
5878
5879
5880 struct yaffs_ShadowFixerStruct {
5881         int objectId;
5882         int shadowedId;
5883         struct yaffs_ShadowFixerStruct *next;
5884 };
5885
5886
5887 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
5888 {
5889         /*
5890         *  Sort out state of unlinked and deleted objects after scanning.
5891         */
5892         struct ylist_head *i;
5893         struct ylist_head *n;
5894         yaffs_Object *l;
5895
5896         /* Soft delete all the unlinked files */
5897         ylist_for_each_safe(i, n,
5898                 &dev->unlinkedDir->variant.directoryVariant.children) {
5899                 if (i) {
5900                         l = ylist_entry(i, yaffs_Object, siblings);
5901                         yaffs_DeleteObject(l);
5902                 }
5903         }
5904
5905         ylist_for_each_safe(i, n,
5906                 &dev->deletedDir->variant.directoryVariant.children) {
5907                 if (i) {
5908                         l = ylist_entry(i, yaffs_Object, siblings);
5909                         yaffs_DeleteObject(l);
5910                 }
5911         }
5912
5913 }
5914
5915 /*
5916  * This code iterates through all the objects making sure that they are rooted.
5917  * Any unrooted objects are re-rooted in lost+found.
5918  * An object needs to be in one of:
5919  * - Directly under deleted, unlinked
5920  * - Directly or indirectly under root.
5921  *
5922  * Note:
5923  *  This code assumes that we don't ever change the current relationships between
5924  *  directories:
5925  *   rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL
5926  *   lostNfound->parent == rootDir
5927  *
5928  * This fixes the problem where directories might have inadvertently been deleted
5929  * leaving the object "hanging" without being rooted in the directory tree.
5930  */
5931
5932 static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj)
5933 {
5934         return (obj == dev->deletedDir ||
5935                 obj == dev->unlinkedDir||
5936                 obj == dev->rootDir);
5937 }
5938
5939 static void yaffs_FixHangingObjects(yaffs_Device *dev)
5940 {
5941         yaffs_Object *obj;
5942         yaffs_Object *parent;
5943         int i;
5944         struct ylist_head *lh;
5945         struct ylist_head *n;
5946         int depthLimit;
5947         int hanging;
5948
5949
5950         /* Iterate through the objects in each hash entry,
5951          * looking at each object.
5952          * Make sure it is rooted.
5953          */
5954
5955         for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
5956                 ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) {
5957                         if (lh) {
5958                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
5959                                 parent= obj->parent;
5960
5961                                 if(yaffs_HasNULLParent(dev,obj)){
5962                                         /* These directories are not hanging */
5963                                         hanging = 0;
5964                                 }
5965                                 else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5966                                         hanging = 1;
5967                                 else if(yaffs_HasNULLParent(dev,parent))
5968                                         hanging = 0;
5969                                 else {
5970                                         /*
5971                                          * Need to follow the parent chain to see if it is hanging.
5972                                          */
5973                                         hanging = 0;
5974                                         depthLimit=100;
5975
5976                                         while(parent != dev->rootDir &&
5977                                                 parent->parent &&
5978                                                 parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
5979                                                 depthLimit > 0){
5980                                                 parent = parent->parent;
5981                                                 depthLimit--;
5982                                         }
5983                                         if(parent != dev->rootDir)
5984                                                 hanging = 1;
5985                                 }
5986                                 if(hanging){
5987                                         T(YAFFS_TRACE_SCAN,
5988                                           (TSTR("Hanging object %d moved to lost and found" TENDSTR),
5989                                                 obj->objectId));
5990                                         yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj);
5991                                 }
5992                         }
5993                 }
5994         }
5995 }
5996
5997
5998 /*
5999  * Delete directory contents for cleaning up lost and found.
6000  */
6001 static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
6002 {
6003         yaffs_Object *obj;
6004         struct ylist_head *lh;
6005         struct ylist_head *n;
6006
6007         if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
6008                 YBUG();
6009
6010         ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) {
6011                 if (lh) {
6012                         obj = ylist_entry(lh, yaffs_Object, siblings);
6013                         if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
6014                                 yaffs_DeleteDirectoryContents(obj);
6015
6016                         T(YAFFS_TRACE_SCAN,
6017                                 (TSTR("Deleting lost_found object %d" TENDSTR),
6018                                 obj->objectId));
6019
6020                         /* Need to use UnlinkObject since Delete would not handle
6021                          * hardlinked objects correctly.
6022                          */
6023                         yaffs_UnlinkObject(obj);
6024                 }
6025         }
6026
6027 }
6028
6029 static void yaffs_EmptyLostAndFound(yaffs_Device *dev)
6030 {
6031         yaffs_DeleteDirectoryContents(dev->lostNFoundDir);
6032 }
6033
6034 static int yaffs_Scan(yaffs_Device *dev)
6035 {
6036         yaffs_ExtendedTags tags;
6037         int blk;
6038         int blockIterator;
6039         int startIterator;
6040         int endIterator;
6041         int result;
6042
6043         int chunk;
6044         int c;
6045         int deleted;
6046         yaffs_BlockState state;
6047         yaffs_Object *hardList = NULL;
6048         yaffs_BlockInfo *bi;
6049         __u32 sequenceNumber;
6050         yaffs_ObjectHeader *oh;
6051         yaffs_Object *in;
6052         yaffs_Object *parent;
6053
6054         int alloc_failed = 0;
6055
6056         struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
6057
6058
6059         __u8 *chunkData;
6060
6061
6062
6063         T(YAFFS_TRACE_SCAN,
6064           (TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
6065            dev->internalStartBlock, dev->internalEndBlock));
6066
6067         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6068
6069         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
6070
6071         /* Scan all the blocks to determine their state */
6072         bi = dev->blockInfo;
6073         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6074                 yaffs_ClearChunkBits(dev, blk);
6075                 bi->pagesInUse = 0;
6076                 bi->softDeletions = 0;
6077
6078                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6079
6080                 bi->blockState = state;
6081                 bi->sequenceNumber = sequenceNumber;
6082
6083                 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6084                         bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6085
6086                 T(YAFFS_TRACE_SCAN_DEBUG,
6087                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6088                    state, sequenceNumber));
6089
6090                 if (state == YAFFS_BLOCK_STATE_DEAD) {
6091                         T(YAFFS_TRACE_BAD_BLOCKS,
6092                           (TSTR("block %d is bad" TENDSTR), blk));
6093                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6094                         T(YAFFS_TRACE_SCAN_DEBUG,
6095                           (TSTR("Block empty " TENDSTR)));
6096                         dev->nErasedBlocks++;
6097                         dev->nFreeChunks += dev->param.nChunksPerBlock;
6098                 }
6099                 bi++;
6100         }
6101
6102         startIterator = dev->internalStartBlock;
6103         endIterator = dev->internalEndBlock;
6104
6105         /* For each block.... */
6106         for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
6107              blockIterator++) {
6108
6109                 YYIELD();
6110
6111                 YYIELD();
6112
6113                 blk = blockIterator;
6114
6115                 bi = yaffs_GetBlockInfo(dev, blk);
6116                 state = bi->blockState;
6117
6118                 deleted = 0;
6119
6120                 /* For each chunk in each block that needs scanning....*/
6121                 for (c = 0; !alloc_failed && c < dev->param.nChunksPerBlock &&
6122                      state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
6123                         /* Read the tags and decide what to do */
6124                         chunk = blk * dev->param.nChunksPerBlock + c;
6125
6126                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6127                                                         &tags);
6128
6129                         /* Let's have a good look at this chunk... */
6130
6131                         if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
6132                                 /* YAFFS1 only...
6133                                  * A deleted chunk
6134                                  */
6135                                 deleted++;
6136                                 dev->nFreeChunks++;
6137                                 /*T((" %d %d deleted\n",blk,c)); */
6138                         } else if (!tags.chunkUsed) {
6139                                 /* An unassigned chunk in the block
6140                                  * This means that either the block is empty or
6141                                  * this is the one being allocated from
6142                                  */
6143
6144                                 if (c == 0) {
6145                                         /* We're looking at the first chunk in the block so the block is unused */
6146                                         state = YAFFS_BLOCK_STATE_EMPTY;
6147                                         dev->nErasedBlocks++;
6148                                 } else {
6149                                         /* this is the block being allocated from */
6150                                         T(YAFFS_TRACE_SCAN,
6151                                           (TSTR
6152                                            (" Allocating from %d %d" TENDSTR),
6153                                            blk, c));
6154                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
6155                                         dev->allocationBlock = blk;
6156                                         dev->allocationPage = c;
6157                                         dev->allocationBlockFinder = blk;
6158                                         /* Set block finder here to encourage the allocator to go forth from here. */
6159
6160                                 }
6161
6162                                 dev->nFreeChunks += (dev->param.nChunksPerBlock - c);
6163                         } else if (tags.chunkId > 0) {
6164                                 /* chunkId > 0 so it is a data chunk... */
6165                                 unsigned int endpos;
6166
6167                                 yaffs_SetChunkBit(dev, blk, c);
6168                                 bi->pagesInUse++;
6169
6170                                 in = yaffs_FindOrCreateObjectByNumber(dev,
6171                                                                       tags.
6172                                                                       objectId,
6173                                                                       YAFFS_OBJECT_TYPE_FILE);
6174                                 /* PutChunkIntoFile checks for a clash (two data chunks with
6175                                  * the same chunkId).
6176                                  */
6177
6178                                 if (!in)
6179                                         alloc_failed = 1;
6180
6181                                 if (in) {
6182                                         if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
6183                                                 alloc_failed = 1;
6184                                 }
6185
6186                                 endpos =
6187                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk +
6188                                     tags.byteCount;
6189                                 if (in &&
6190                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
6191                                     && in->variant.fileVariant.scannedFileSize <
6192                                     endpos) {
6193                                         in->variant.fileVariant.
6194                                             scannedFileSize = endpos;
6195                                         if (!dev->param.useHeaderFileSize) {
6196                                                 in->variant.fileVariant.
6197                                                     fileSize =
6198                                                     in->variant.fileVariant.
6199                                                     scannedFileSize;
6200                                         }
6201
6202                                 }
6203                                 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
6204                         } else {
6205                                 /* chunkId == 0, so it is an ObjectHeader.
6206                                  * Thus, we read in the object header and make the object
6207                                  */
6208                                 yaffs_SetChunkBit(dev, blk, c);
6209                                 bi->pagesInUse++;
6210
6211                                 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
6212                                                                 chunkData,
6213                                                                 NULL);
6214
6215                                 oh = (yaffs_ObjectHeader *) chunkData;
6216
6217                                 in = yaffs_FindObjectByNumber(dev,
6218                                                               tags.objectId);
6219                                 if (in && in->variantType != oh->type) {
6220                                         /* This should not happen, but somehow
6221                                          * Wev'e ended up with an objectId that has been reused but not yet
6222                                          * deleted, and worse still it has changed type. Delete the old object.
6223                                          */
6224
6225                                         yaffs_DeleteObject(in);
6226
6227                                         in = 0;
6228                                 }
6229
6230                                 in = yaffs_FindOrCreateObjectByNumber(dev,
6231                                                                       tags.
6232                                                                       objectId,
6233                                                                       oh->type);
6234
6235                                 if (!in)
6236                                         alloc_failed = 1;
6237
6238                                 if (in && oh->shadowsObject > 0) {
6239
6240                                         struct yaffs_ShadowFixerStruct *fixer;
6241                                         fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
6242                                         if (fixer) {
6243                                                 fixer->next = shadowFixerList;
6244                                                 shadowFixerList = fixer;
6245                                                 fixer->objectId = tags.objectId;
6246                                                 fixer->shadowedId = oh->shadowsObject;
6247                                         }
6248
6249                                 }
6250
6251                                 if (in && in->valid) {
6252                                         /* We have already filled this one. We have a duplicate and need to resolve it. */
6253
6254                                         unsigned existingSerial = in->serial;
6255                                         unsigned newSerial = tags.serialNumber;
6256
6257                                         if (((existingSerial + 1) & 3) == newSerial) {
6258                                                 /* Use new one - destroy the exisiting one */
6259                                                 yaffs_DeleteChunk(dev,
6260                                                                   in->hdrChunk,
6261                                                                   1, __LINE__);
6262                                                 in->valid = 0;
6263                                         } else {
6264                                                 /* Use existing - destroy this one. */
6265                                                 yaffs_DeleteChunk(dev, chunk, 1,
6266                                                                   __LINE__);
6267                                         }
6268                                 }
6269
6270                                 if (in && !in->valid &&
6271                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6272                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
6273                                         /* We only load some info, don't fiddle with directory structure */
6274                                         in->valid = 1;
6275                                         in->variantType = oh->type;
6276
6277                                         in->yst_mode = oh->yst_mode;
6278 #ifdef CONFIG_YAFFS_WINCE
6279                                         in->win_atime[0] = oh->win_atime[0];
6280                                         in->win_ctime[0] = oh->win_ctime[0];
6281                                         in->win_mtime[0] = oh->win_mtime[0];
6282                                         in->win_atime[1] = oh->win_atime[1];
6283                                         in->win_ctime[1] = oh->win_ctime[1];
6284                                         in->win_mtime[1] = oh->win_mtime[1];
6285 #else
6286                                         in->yst_uid = oh->yst_uid;
6287                                         in->yst_gid = oh->yst_gid;
6288                                         in->yst_atime = oh->yst_atime;
6289                                         in->yst_mtime = oh->yst_mtime;
6290                                         in->yst_ctime = oh->yst_ctime;
6291                                         in->yst_rdev = oh->yst_rdev;
6292 #endif
6293                                         in->hdrChunk = chunk;
6294                                         in->serial = tags.serialNumber;
6295
6296                                 } else if (in && !in->valid) {
6297                                         /* we need to load this info */
6298
6299                                         in->valid = 1;
6300                                         in->variantType = oh->type;
6301
6302                                         in->yst_mode = oh->yst_mode;
6303 #ifdef CONFIG_YAFFS_WINCE
6304                                         in->win_atime[0] = oh->win_atime[0];
6305                                         in->win_ctime[0] = oh->win_ctime[0];
6306                                         in->win_mtime[0] = oh->win_mtime[0];
6307                                         in->win_atime[1] = oh->win_atime[1];
6308                                         in->win_ctime[1] = oh->win_ctime[1];
6309                                         in->win_mtime[1] = oh->win_mtime[1];
6310 #else
6311                                         in->yst_uid = oh->yst_uid;
6312                                         in->yst_gid = oh->yst_gid;
6313                                         in->yst_atime = oh->yst_atime;
6314                                         in->yst_mtime = oh->yst_mtime;
6315                                         in->yst_ctime = oh->yst_ctime;
6316                                         in->yst_rdev = oh->yst_rdev;
6317 #endif
6318                                         in->hdrChunk = chunk;
6319                                         in->serial = tags.serialNumber;
6320
6321                                         yaffs_SetObjectName(in, oh->name);
6322                                         in->dirty = 0;
6323
6324                                         /* directory stuff...
6325                                          * hook up to parent
6326                                          */
6327
6328                                         parent =
6329                                             yaffs_FindOrCreateObjectByNumber
6330                                             (dev, oh->parentObjectId,
6331                                              YAFFS_OBJECT_TYPE_DIRECTORY);
6332                                         if (!parent)
6333                                                 alloc_failed = 1;
6334                                         if (parent && parent->variantType ==
6335                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
6336                                                 /* Set up as a directory */
6337                                                 parent->variantType =
6338                                                         YAFFS_OBJECT_TYPE_DIRECTORY;
6339                                                 YINIT_LIST_HEAD(&parent->variant.
6340                                                                 directoryVariant.
6341                                                                 children);
6342                                         } else if (!parent || parent->variantType !=
6343                                                    YAFFS_OBJECT_TYPE_DIRECTORY) {
6344                                                 /* Hoosterman, another problem....
6345                                                  * We're trying to use a non-directory as a directory
6346                                                  */
6347
6348                                                 T(YAFFS_TRACE_ERROR,
6349                                                   (TSTR
6350                                                    ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6351                                                     TENDSTR)));
6352                                                 parent = dev->lostNFoundDir;
6353                                         }
6354
6355                                         yaffs_AddObjectToDirectory(parent, in);
6356
6357                                         if (0 && (parent == dev->deletedDir ||
6358                                                   parent == dev->unlinkedDir)) {
6359                                                 in->deleted = 1;        /* If it is unlinked at start up then it wants deleting */
6360                                                 dev->nDeletedFiles++;
6361                                         }
6362                                         /* Note re hardlinks.
6363                                          * Since we might scan a hardlink before its equivalent object is scanned
6364                                          * we put them all in a list.
6365                                          * After scanning is complete, we should have all the objects, so we run through this
6366                                          * list and fix up all the chains.
6367                                          */
6368
6369                                         switch (in->variantType) {
6370                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
6371                                                 /* Todo got a problem */
6372                                                 break;
6373                                         case YAFFS_OBJECT_TYPE_FILE:
6374                                                 if (dev->param.useHeaderFileSize)
6375
6376                                                         in->variant.fileVariant.
6377                                                             fileSize =
6378                                                             oh->fileSize;
6379
6380                                                 break;
6381                                         case YAFFS_OBJECT_TYPE_HARDLINK:
6382                                                 in->variant.hardLinkVariant.
6383                                                         equivalentObjectId =
6384                                                         oh->equivalentObjectId;
6385                                                 in->hardLinks.next =
6386                                                         (struct ylist_head *)
6387                                                         hardList;
6388                                                 hardList = in;
6389                                                 break;
6390                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
6391                                                 /* Do nothing */
6392                                                 break;
6393                                         case YAFFS_OBJECT_TYPE_SPECIAL:
6394                                                 /* Do nothing */
6395                                                 break;
6396                                         case YAFFS_OBJECT_TYPE_SYMLINK:
6397                                                 in->variant.symLinkVariant.alias =
6398                                                     yaffs_CloneString(oh->alias);
6399                                                 if (!in->variant.symLinkVariant.alias)
6400                                                         alloc_failed = 1;
6401                                                 break;
6402                                         }
6403
6404                                 }
6405                         }
6406                 }
6407
6408                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6409                         /* If we got this far while scanning, then the block is fully allocated.*/
6410                         state = YAFFS_BLOCK_STATE_FULL;
6411                 }
6412
6413                 if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
6414                         /* If the block was partially allocated then treat it as fully allocated.*/
6415                         state = YAFFS_BLOCK_STATE_FULL;
6416                         dev->allocationBlock = -1;
6417                 }
6418
6419                 bi->blockState = state;
6420
6421                 /* Now let's see if it was dirty */
6422                 if (bi->pagesInUse == 0 &&
6423                     !bi->hasShrinkHeader &&
6424                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6425                         yaffs_BlockBecameDirty(dev, blk);
6426                 }
6427
6428         }
6429
6430
6431         /* Ok, we've done all the scanning.
6432          * Fix up the hard link chains.
6433          * We should now have scanned all the objects, now it's time to add these
6434          * hardlinks.
6435          */
6436
6437         yaffs_HardlinkFixup(dev, hardList);
6438
6439         /* Fix up any shadowed objects */
6440         {
6441                 struct yaffs_ShadowFixerStruct *fixer;
6442                 yaffs_Object *obj;
6443
6444                 while (shadowFixerList) {
6445                         fixer = shadowFixerList;
6446                         shadowFixerList = fixer->next;
6447                         /* Complete the rename transaction by deleting the shadowed object
6448                          * then setting the object header to unshadowed.
6449                          */
6450                         obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
6451                         if (obj)
6452                                 yaffs_DeleteObject(obj);
6453
6454                         obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
6455
6456                         if (obj)
6457                                 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6458
6459                         YFREE(fixer);
6460                 }
6461         }
6462
6463         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6464
6465         if (alloc_failed)
6466                 return YAFFS_FAIL;
6467
6468         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
6469
6470
6471         return YAFFS_OK;
6472 }
6473
6474 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
6475 {
6476         __u8 *chunkData;
6477         yaffs_ObjectHeader *oh;
6478         yaffs_Device *dev;
6479         yaffs_ExtendedTags tags;
6480         int result;
6481         int alloc_failed = 0;
6482
6483         if (!in)
6484                 return;
6485
6486         dev = in->myDev;
6487
6488 #if 0
6489         T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
6490                 in->objectId,
6491                 in->lazyLoaded ? "not yet" : "already"));
6492 #endif
6493
6494         if (in->lazyLoaded && in->hdrChunk > 0) {
6495                 in->lazyLoaded = 0;
6496                 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6497
6498                 result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
6499                 oh = (yaffs_ObjectHeader *) chunkData;
6500
6501                 in->yst_mode = oh->yst_mode;
6502 #ifdef CONFIG_YAFFS_WINCE
6503                 in->win_atime[0] = oh->win_atime[0];
6504                 in->win_ctime[0] = oh->win_ctime[0];
6505                 in->win_mtime[0] = oh->win_mtime[0];
6506                 in->win_atime[1] = oh->win_atime[1];
6507                 in->win_ctime[1] = oh->win_ctime[1];
6508                 in->win_mtime[1] = oh->win_mtime[1];
6509 #else
6510                 in->yst_uid = oh->yst_uid;
6511                 in->yst_gid = oh->yst_gid;
6512                 in->yst_atime = oh->yst_atime;
6513                 in->yst_mtime = oh->yst_mtime;
6514                 in->yst_ctime = oh->yst_ctime;
6515                 in->yst_rdev = oh->yst_rdev;
6516
6517 #endif
6518                 yaffs_SetObjectName(in, oh->name);
6519
6520                 if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6521                         in->variant.symLinkVariant.alias =
6522                                                     yaffs_CloneString(oh->alias);
6523                         if (!in->variant.symLinkVariant.alias)
6524                                 alloc_failed = 1; /* Not returned to caller */
6525                 }
6526
6527                 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6528         }
6529 }
6530
6531 static int yaffs_ScanBackwards(yaffs_Device *dev)
6532 {
6533         yaffs_ExtendedTags tags;
6534         int blk;
6535         int blockIterator;
6536         int startIterator;
6537         int endIterator;
6538         int nBlocksToScan = 0;
6539
6540         int chunk;
6541         int result;
6542         int c;
6543         int deleted;
6544         yaffs_BlockState state;
6545         yaffs_Object *hardList = NULL;
6546         yaffs_BlockInfo *bi;
6547         __u32 sequenceNumber;
6548         yaffs_ObjectHeader *oh;
6549         yaffs_Object *in;
6550         yaffs_Object *parent;
6551         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
6552         int itsUnlinked;
6553         __u8 *chunkData;
6554
6555         int fileSize;
6556         int isShrink;
6557         int foundChunksInBlock;
6558         int equivalentObjectId;
6559         int alloc_failed = 0;
6560
6561
6562         yaffs_BlockIndex *blockIndex = NULL;
6563         int altBlockIndex = 0;
6564
6565         if (!dev->param.isYaffs2) {
6566                 T(YAFFS_TRACE_SCAN,
6567                   (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
6568                 return YAFFS_FAIL;
6569         }
6570
6571         T(YAFFS_TRACE_SCAN,
6572           (TSTR
6573            ("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..."
6574             TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
6575
6576
6577         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
6578
6579         blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
6580
6581         if (!blockIndex) {
6582                 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
6583                 altBlockIndex = 1;
6584         }
6585
6586         if (!blockIndex) {
6587                 T(YAFFS_TRACE_SCAN,
6588                   (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
6589                 return YAFFS_FAIL;
6590         }
6591
6592         dev->blocksInCheckpoint = 0;
6593
6594         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6595
6596         /* Scan all the blocks to determine their state */
6597         bi = dev->blockInfo;
6598         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6599                 yaffs_ClearChunkBits(dev, blk);
6600                 bi->pagesInUse = 0;
6601                 bi->softDeletions = 0;
6602
6603                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6604
6605                 bi->blockState = state;
6606                 bi->sequenceNumber = sequenceNumber;
6607
6608                 if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6609                         bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6610                 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6611                         bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6612
6613                 T(YAFFS_TRACE_SCAN_DEBUG,
6614                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6615                    state, sequenceNumber));
6616
6617
6618                 if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
6619                         dev->blocksInCheckpoint++;
6620
6621                 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6622                         T(YAFFS_TRACE_BAD_BLOCKS,
6623                           (TSTR("block %d is bad" TENDSTR), blk));
6624                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6625                         T(YAFFS_TRACE_SCAN_DEBUG,
6626                           (TSTR("Block empty " TENDSTR)));
6627                         dev->nErasedBlocks++;
6628                         dev->nFreeChunks += dev->param.nChunksPerBlock;
6629                 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6630
6631                         /* Determine the highest sequence number */
6632                         if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6633                             sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6634
6635                                 blockIndex[nBlocksToScan].seq = sequenceNumber;
6636                                 blockIndex[nBlocksToScan].block = blk;
6637
6638                                 nBlocksToScan++;
6639
6640                                 if (sequenceNumber >= dev->sequenceNumber)
6641                                         dev->sequenceNumber = sequenceNumber;
6642                         } else {
6643                                 /* TODO: Nasty sequence number! */
6644                                 T(YAFFS_TRACE_SCAN,
6645                                   (TSTR
6646                                    ("Block scanning block %d has bad sequence number %d"
6647                                     TENDSTR), blk, sequenceNumber));
6648
6649                         }
6650                 }
6651                 bi++;
6652         }
6653
6654         T(YAFFS_TRACE_SCAN,
6655         (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6656
6657
6658
6659         YYIELD();
6660
6661         /* Sort the blocks */
6662 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6663         {
6664                 /* Use qsort now. */
6665                 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6666         }
6667 #else
6668         {
6669                 /* Dungy old bubble sort... */
6670
6671                 yaffs_BlockIndex temp;
6672                 int i;
6673                 int j;
6674
6675                 for (i = 0; i < nBlocksToScan; i++)
6676                         for (j = i + 1; j < nBlocksToScan; j++)
6677                                 if (blockIndex[i].seq > blockIndex[j].seq) {
6678                                         temp = blockIndex[j];
6679                                         blockIndex[j] = blockIndex[i];
6680                                         blockIndex[i] = temp;
6681                                 }
6682         }
6683 #endif
6684
6685         YYIELD();
6686
6687         T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6688
6689         /* Now scan the blocks looking at the data. */
6690         startIterator = 0;
6691         endIterator = nBlocksToScan - 1;
6692         T(YAFFS_TRACE_SCAN_DEBUG,
6693           (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6694
6695         /* For each block.... backwards */
6696         for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6697                         blockIterator--) {
6698                 /* Cooperative multitasking! This loop can run for so
6699                    long that watchdog timers expire. */
6700                 YYIELD();
6701
6702                 /* get the block to scan in the correct order */
6703                 blk = blockIndex[blockIterator].block;
6704
6705                 bi = yaffs_GetBlockInfo(dev, blk);
6706
6707
6708                 state = bi->blockState;
6709
6710                 deleted = 0;
6711
6712                 /* For each chunk in each block that needs scanning.... */
6713                 foundChunksInBlock = 0;
6714                 for (c = dev->param.nChunksPerBlock - 1;
6715                      !alloc_failed && c >= 0 &&
6716                      (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6717                       state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6718                         /* Scan backwards...
6719                          * Read the tags and decide what to do
6720                          */
6721
6722                         chunk = blk * dev->param.nChunksPerBlock + c;
6723
6724                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6725                                                         &tags);
6726
6727                         /* Let's have a good look at this chunk... */
6728
6729                         if (!tags.chunkUsed) {
6730                                 /* An unassigned chunk in the block.
6731                                  * If there are used chunks after this one, then
6732                                  * it is a chunk that was skipped due to failing the erased
6733                                  * check. Just skip it so that it can be deleted.
6734                                  * But, more typically, We get here when this is an unallocated
6735                                  * chunk and his means that either the block is empty or
6736                                  * this is the one being allocated from
6737                                  */
6738
6739                                 if (foundChunksInBlock) {
6740                                         /* This is a chunk that was skipped due to failing the erased check */
6741                                 } else if (c == 0) {
6742                                         /* We're looking at the first chunk in the block so the block is unused */
6743                                         state = YAFFS_BLOCK_STATE_EMPTY;
6744                                         dev->nErasedBlocks++;
6745                                 } else {
6746                                         if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6747                                             state == YAFFS_BLOCK_STATE_ALLOCATING) {
6748                                                 if (dev->sequenceNumber == bi->sequenceNumber) {
6749                                                         /* this is the block being allocated from */
6750
6751                                                         T(YAFFS_TRACE_SCAN,
6752                                                           (TSTR
6753                                                            (" Allocating from %d %d"
6754                                                             TENDSTR), blk, c));
6755
6756                                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
6757                                                         dev->allocationBlock = blk;
6758                                                         dev->allocationPage = c;
6759                                                         dev->allocationBlockFinder = blk;
6760                                                 } else {
6761                                                         /* This is a partially written block that is not
6762                                                          * the current allocation block.
6763                                                          */
6764
6765                                                          T(YAFFS_TRACE_ALWAYS,
6766                                                          (TSTR("Partially written block %d detected" TENDSTR),
6767                                                          blk));
6768                                                 }
6769                                         }
6770                                 }
6771
6772                                 dev->nFreeChunks++;
6773
6774                         } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
6775                                 T(YAFFS_TRACE_SCAN,
6776                                   (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
6777                                   blk, c));
6778
6779                                   dev->nFreeChunks++;
6780
6781                         } else if (tags.chunkId > 0) {
6782                                 /* chunkId > 0 so it is a data chunk... */
6783                                 unsigned int endpos;
6784                                 __u32 chunkBase =
6785                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6786
6787                                 foundChunksInBlock = 1;
6788
6789
6790                                 yaffs_SetChunkBit(dev, blk, c);
6791                                 bi->pagesInUse++;
6792
6793                                 in = yaffs_FindOrCreateObjectByNumber(dev,
6794                                                                       tags.
6795                                                                       objectId,
6796                                                                       YAFFS_OBJECT_TYPE_FILE);
6797                                 if (!in) {
6798                                         /* Out of memory */
6799                                         alloc_failed = 1;
6800                                 }
6801
6802                                 if (in &&
6803                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
6804                                     && chunkBase < in->variant.fileVariant.shrinkSize) {
6805                                         /* This has not been invalidated by a resize */
6806                                         if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, -1)) {
6807                                                 alloc_failed = 1;
6808                                         }
6809
6810                                         /* File size is calculated by looking at the data chunks if we have not
6811                                          * seen an object header yet. Stop this practice once we find an object header.
6812                                          */
6813                                         endpos = chunkBase + tags.byteCount;
6814
6815                                         if (!in->valid &&       /* have not got an object header yet */
6816                                             in->variant.fileVariant.scannedFileSize < endpos) {
6817                                                 in->variant.fileVariant.scannedFileSize = endpos;
6818                                                 in->variant.fileVariant.fileSize = endpos;
6819                                         }
6820
6821                                 } else if (in) {
6822                                         /* This chunk has been invalidated by a resize, or a past file deletion
6823                                          * so delete the chunk*/
6824                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6825
6826                                 }
6827                         } else {
6828                                 /* chunkId == 0, so it is an ObjectHeader.
6829                                  * Thus, we read in the object header and make the object
6830                                  */
6831                                 foundChunksInBlock = 1;
6832
6833                                 yaffs_SetChunkBit(dev, blk, c);
6834                                 bi->pagesInUse++;
6835
6836                                 oh = NULL;
6837                                 in = NULL;
6838
6839                                 if (tags.extraHeaderInfoAvailable) {
6840                                         in = yaffs_FindOrCreateObjectByNumber(dev,
6841                                                 tags.objectId,
6842                                                 tags.extraObjectType);
6843                                         if (!in)
6844                                                 alloc_failed = 1;
6845                                 }
6846
6847                                 if (!in ||
6848                                     (!in->valid && dev->param.disableLazyLoad) ||
6849                                     tags.extraShadows ||
6850                                     (!in->valid &&
6851                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6852                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
6853
6854                                         /* If we don't have  valid info then we need to read the chunk
6855                                          * TODO In future we can probably defer reading the chunk and
6856                                          * living with invalid data until needed.
6857                                          */
6858
6859                                         result = yaffs_ReadChunkWithTagsFromNAND(dev,
6860                                                                         chunk,
6861                                                                         chunkData,
6862                                                                         NULL);
6863
6864                                         oh = (yaffs_ObjectHeader *) chunkData;
6865
6866                                         if (dev->param.inbandTags) {
6867                                                 /* Fix up the header if they got corrupted by inband tags */
6868                                                 oh->shadowsObject = oh->inbandShadowsObject;
6869                                                 oh->isShrink = oh->inbandIsShrink;
6870                                         }
6871
6872                                         if (!in) {
6873                                                 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6874                                                 if (!in)
6875                                                         alloc_failed = 1;
6876                                         }
6877
6878                                 }
6879
6880                                 if (!in) {
6881                                         /* TODO Hoosterman we have a problem! */
6882                                         T(YAFFS_TRACE_ERROR,
6883                                           (TSTR
6884                                            ("yaffs tragedy: Could not make object for object  %d at chunk %d during scan"
6885                                             TENDSTR), tags.objectId, chunk));
6886                                         continue;
6887                                 }
6888
6889                                 if (in->valid) {
6890                                         /* We have already filled this one.
6891                                          * We have a duplicate that will be discarded, but
6892                                          * we first have to suck out resize info if it is a file.
6893                                          */
6894
6895                                         if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6896                                              ((oh &&
6897                                                oh->type == YAFFS_OBJECT_TYPE_FILE) ||
6898                                               (tags.extraHeaderInfoAvailable  &&
6899                                                tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
6900                                                 __u32 thisSize =
6901                                                     (oh) ? oh->fileSize : tags.
6902                                                     extraFileLength;
6903                                                 __u32 parentObjectId =
6904                                                     (oh) ? oh->
6905                                                     parentObjectId : tags.
6906                                                     extraParentObjectId;
6907
6908
6909                                                 isShrink =
6910                                                     (oh) ? oh->isShrink : tags.
6911                                                     extraIsShrinkHeader;
6912
6913                                                 /* If it is deleted (unlinked at start also means deleted)
6914                                                  * we treat the file size as being zeroed at this point.
6915                                                  */
6916                                                 if (parentObjectId ==
6917                                                     YAFFS_OBJECTID_DELETED
6918                                                     || parentObjectId ==
6919                                                     YAFFS_OBJECTID_UNLINKED) {
6920                                                         thisSize = 0;
6921                                                         isShrink = 1;
6922                                                 }
6923
6924                                                 if (isShrink && in->variant.fileVariant.shrinkSize > thisSize)
6925                                                         in->variant.fileVariant.shrinkSize = thisSize;
6926
6927                                                 if (isShrink)
6928                                                         bi->hasShrinkHeader = 1;
6929
6930                                         }
6931                                         /* Use existing - destroy this one. */
6932                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6933
6934                                 }
6935
6936                                 if (!in->valid && in->variantType !=
6937                                     (oh ? oh->type : tags.extraObjectType))
6938                                         T(YAFFS_TRACE_ERROR, (
6939                                                 TSTR("yaffs tragedy: Bad object type, "
6940                                             TCONT("%d != %d, for object %d at chunk ")
6941                                             TCONT("%d during scan")
6942                                                 TENDSTR), oh ?
6943                                             oh->type : tags.extraObjectType,
6944                                             in->variantType, tags.objectId,
6945                                             chunk));
6946
6947                                 if (!in->valid &&
6948                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6949                                      tags.objectId ==
6950                                      YAFFS_OBJECTID_LOSTNFOUND)) {
6951                                         /* We only load some info, don't fiddle with directory structure */
6952                                         in->valid = 1;
6953
6954                                         if (oh) {
6955                                                 in->variantType = oh->type;
6956
6957                                                 in->yst_mode = oh->yst_mode;
6958 #ifdef CONFIG_YAFFS_WINCE
6959                                                 in->win_atime[0] = oh->win_atime[0];
6960                                                 in->win_ctime[0] = oh->win_ctime[0];
6961                                                 in->win_mtime[0] = oh->win_mtime[0];
6962                                                 in->win_atime[1] = oh->win_atime[1];
6963                                                 in->win_ctime[1] = oh->win_ctime[1];
6964                                                 in->win_mtime[1] = oh->win_mtime[1];
6965 #else
6966                                                 in->yst_uid = oh->yst_uid;
6967                                                 in->yst_gid = oh->yst_gid;
6968                                                 in->yst_atime = oh->yst_atime;
6969                                                 in->yst_mtime = oh->yst_mtime;
6970                                                 in->yst_ctime = oh->yst_ctime;
6971                                                 in->yst_rdev = oh->yst_rdev;
6972
6973 #endif
6974                                         } else {
6975                                                 in->variantType = tags.extraObjectType;
6976                                                 in->lazyLoaded = 1;
6977                                         }
6978
6979                                         in->hdrChunk = chunk;
6980
6981                                 } else if (!in->valid) {
6982                                         /* we need to load this info */
6983
6984                                         in->valid = 1;
6985                                         in->hdrChunk = chunk;
6986
6987                                         if (oh) {
6988                                                 in->variantType = oh->type;
6989
6990                                                 in->yst_mode = oh->yst_mode;
6991 #ifdef CONFIG_YAFFS_WINCE
6992                                                 in->win_atime[0] = oh->win_atime[0];
6993                                                 in->win_ctime[0] = oh->win_ctime[0];
6994                                                 in->win_mtime[0] = oh->win_mtime[0];
6995                                                 in->win_atime[1] = oh->win_atime[1];
6996                                                 in->win_ctime[1] = oh->win_ctime[1];
6997                                                 in->win_mtime[1] = oh->win_mtime[1];
6998 #else
6999                                                 in->yst_uid = oh->yst_uid;
7000                                                 in->yst_gid = oh->yst_gid;
7001                                                 in->yst_atime = oh->yst_atime;
7002                                                 in->yst_mtime = oh->yst_mtime;
7003                                                 in->yst_ctime = oh->yst_ctime;
7004                                                 in->yst_rdev = oh->yst_rdev;
7005 #endif
7006
7007                                                 if (oh->shadowsObject > 0)
7008                                                         yaffs_HandleShadowedObject(dev,
7009                                                                            oh->
7010                                                                            shadowsObject,
7011                                                                            1);
7012
7013
7014
7015                                                 yaffs_SetObjectName(in, oh->name);
7016                                                 parent =
7017                                                     yaffs_FindOrCreateObjectByNumber
7018                                                         (dev, oh->parentObjectId,
7019                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
7020
7021                                                  fileSize = oh->fileSize;
7022                                                  isShrink = oh->isShrink;
7023                                                  equivalentObjectId = oh->equivalentObjectId;
7024
7025                                         } else {
7026                                                 in->variantType = tags.extraObjectType;
7027                                                 parent =
7028                                                     yaffs_FindOrCreateObjectByNumber
7029                                                         (dev, tags.extraParentObjectId,
7030                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
7031                                                  fileSize = tags.extraFileLength;
7032                                                  isShrink = tags.extraIsShrinkHeader;
7033                                                  equivalentObjectId = tags.extraEquivalentObjectId;
7034                                                 in->lazyLoaded = 1;
7035
7036                                         }
7037                                         in->dirty = 0;
7038
7039                                         if (!parent)
7040                                                 alloc_failed = 1;
7041
7042                                         /* directory stuff...
7043                                          * hook up to parent
7044                                          */
7045
7046                                         if (parent && parent->variantType ==
7047                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
7048                                                 /* Set up as a directory */
7049                                                 parent->variantType =
7050                                                         YAFFS_OBJECT_TYPE_DIRECTORY;
7051                                                 YINIT_LIST_HEAD(&parent->variant.
7052                                                         directoryVariant.
7053                                                         children);
7054                                         } else if (!parent || parent->variantType !=
7055                                                    YAFFS_OBJECT_TYPE_DIRECTORY) {
7056                                                 /* Hoosterman, another problem....
7057                                                  * We're trying to use a non-directory as a directory
7058                                                  */
7059
7060                                                 T(YAFFS_TRACE_ERROR,
7061                                                   (TSTR
7062                                                    ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
7063                                                     TENDSTR)));
7064                                                 parent = dev->lostNFoundDir;
7065                                         }
7066
7067                                         yaffs_AddObjectToDirectory(parent, in);
7068
7069                                         itsUnlinked = (parent == dev->deletedDir) ||
7070                                                       (parent == dev->unlinkedDir);
7071
7072                                         if (isShrink) {
7073                                                 /* Mark the block as having a shrinkHeader */
7074                                                 bi->hasShrinkHeader = 1;
7075                                         }
7076
7077                                         /* Note re hardlinks.
7078                                          * Since we might scan a hardlink before its equivalent object is scanned
7079                                          * we put them all in a list.
7080                                          * After scanning is complete, we should have all the objects, so we run
7081                                          * through this list and fix up all the chains.
7082                                          */
7083
7084                                         switch (in->variantType) {
7085                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
7086                                                 /* Todo got a problem */
7087                                                 break;
7088                                         case YAFFS_OBJECT_TYPE_FILE:
7089
7090                                                 if (in->variant.fileVariant.
7091                                                     scannedFileSize < fileSize) {
7092                                                         /* This covers the case where the file size is greater
7093                                                          * than where the data is
7094                                                          * This will happen if the file is resized to be larger
7095                                                          * than its current data extents.
7096                                                          */
7097                                                         in->variant.fileVariant.fileSize = fileSize;
7098                                                         in->variant.fileVariant.scannedFileSize = fileSize;
7099                                                 }
7100
7101                                                 if (in->variant.fileVariant.shrinkSize > fileSize)
7102                                                         in->variant.fileVariant.shrinkSize = fileSize;
7103
7104
7105                                                 break;
7106                                         case YAFFS_OBJECT_TYPE_HARDLINK:
7107                                                 if (!itsUnlinked) {
7108                                                         in->variant.hardLinkVariant.equivalentObjectId =
7109                                                                 equivalentObjectId;
7110                                                         in->hardLinks.next =
7111                                                                 (struct ylist_head *) hardList;
7112                                                         hardList = in;
7113                                                 }
7114                                                 break;
7115                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
7116                                                 /* Do nothing */
7117                                                 break;
7118                                         case YAFFS_OBJECT_TYPE_SPECIAL:
7119                                                 /* Do nothing */
7120                                                 break;
7121                                         case YAFFS_OBJECT_TYPE_SYMLINK:
7122                                                 if (oh) {
7123                                                         in->variant.symLinkVariant.alias =
7124                                                                 yaffs_CloneString(oh->alias);
7125                                                         if (!in->variant.symLinkVariant.alias)
7126                                                                 alloc_failed = 1;
7127                                                 }
7128                                                 break;
7129                                         }
7130
7131                                 }
7132
7133                         }
7134
7135                 } /* End of scanning for each chunk */
7136
7137                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
7138                         /* If we got this far while scanning, then the block is fully allocated. */
7139                         state = YAFFS_BLOCK_STATE_FULL;
7140                 }
7141
7142
7143                 bi->blockState = state;
7144
7145                 /* Now let's see if it was dirty */
7146                 if (bi->pagesInUse == 0 &&
7147                     !bi->hasShrinkHeader &&
7148                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
7149                         yaffs_BlockBecameDirty(dev, blk);
7150                 }
7151
7152         }
7153
7154         yaffs_SkipRestOfBlock(dev);
7155
7156         if (altBlockIndex)
7157                 YFREE_ALT(blockIndex);
7158         else
7159                 YFREE(blockIndex);
7160
7161         /* Ok, we've done all the scanning.
7162          * Fix up the hard link chains.
7163          * We should now have scanned all the objects, now it's time to add these
7164          * hardlinks.
7165          */
7166         yaffs_HardlinkFixup(dev, hardList);
7167
7168
7169         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
7170
7171         if (alloc_failed)
7172                 return YAFFS_FAIL;
7173
7174         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
7175
7176         return YAFFS_OK;
7177 }
7178
7179 /*------------------------------  Directory Functions ----------------------------- */
7180
7181 static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
7182 {
7183         struct ylist_head *lh;
7184         yaffs_Object *listObj;
7185
7186         int count = 0;
7187
7188         if (!obj) {
7189                 T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
7190                 YBUG();
7191                 return;
7192         }
7193
7194         if (yaffs_SkipVerification(obj->myDev))
7195                 return;
7196
7197         if (!obj->parent) {
7198                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
7199                 YBUG();
7200                 return;
7201         }
7202
7203         if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7204                 T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
7205                 YBUG();
7206         }
7207
7208         /* Iterate through the objects in each hash entry */
7209
7210         ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
7211                 if (lh) {
7212                         listObj = ylist_entry(lh, yaffs_Object, siblings);
7213                         yaffs_VerifyObject(listObj);
7214                         if (obj == listObj)
7215                                 count++;
7216                 }
7217          }
7218
7219         if (count != 1) {
7220                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
7221                 YBUG();
7222         }
7223 }
7224
7225 static void yaffs_VerifyDirectory(yaffs_Object *directory)
7226 {
7227         struct ylist_head *lh;
7228         yaffs_Object *listObj;
7229
7230         if (!directory) {
7231                 YBUG();
7232                 return;
7233         }
7234
7235         if (yaffs_SkipFullVerification(directory->myDev))
7236                 return;
7237
7238         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7239                 T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
7240                 YBUG();
7241         }
7242
7243         /* Iterate through the objects in each hash entry */
7244
7245         ylist_for_each(lh, &directory->variant.directoryVariant.children) {
7246                 if (lh) {
7247                         listObj = ylist_entry(lh, yaffs_Object, siblings);
7248                         if (listObj->parent != directory) {
7249                                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
7250                                 YBUG();
7251                         }
7252                         yaffs_VerifyObjectInDirectory(listObj);
7253                 }
7254         }
7255 }
7256
7257 /*
7258  *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
7259  * link (ie. name) is created or deleted in the directory.
7260  *
7261  * ie.
7262  *   create dir/a : update dir's mtime/ctime
7263  *   rm dir/a:   update dir's mtime/ctime
7264  *   modify dir/a: don't update dir's mtimme/ctime
7265  *
7266  * This can be handled immediately or defered. Defering helps reduce the number
7267  * of updates when many files in a directory are changed within a brief period.
7268  *
7269  * If the directory updating is defered then yaffs_UpdateDirtyDirecories must be
7270  * called periodically.
7271  */
7272
7273 static void yaffs_UpdateParent(yaffs_Object *obj)
7274 {
7275         yaffs_Device *dev;
7276         if(!obj)
7277                 return;
7278
7279         dev = obj->myDev;
7280         obj->dirty = 1;
7281         obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
7282         if(dev->param.deferDirectoryUpdate){
7283                 struct ylist_head *link = &obj->variant.directoryVariant.dirty;
7284
7285                 if(ylist_empty(link)){
7286                         ylist_add(link,&dev->dirtyDirectories);
7287                         T(YAFFS_TRACE_BACKGROUND, (TSTR("Added object %d to dirty directories" TENDSTR),obj->objectId));
7288                 }
7289
7290         } else
7291                 yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
7292 }
7293
7294 void yaffs_UpdateDirtyDirectories(yaffs_Device *dev)
7295 {
7296         struct ylist_head *link;
7297         yaffs_Object *obj;
7298         yaffs_DirectoryStructure *dS;
7299         yaffs_ObjectVariant *oV;
7300
7301         T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR)));
7302
7303         while(!ylist_empty(&dev->dirtyDirectories)){
7304                 link = dev->dirtyDirectories.next;
7305                 ylist_del_init(link);
7306
7307                 dS=ylist_entry(link,yaffs_DirectoryStructure,dirty);
7308                 oV = ylist_entry(dS,yaffs_ObjectVariant,directoryVariant);
7309                 obj = ylist_entry(oV,yaffs_Object,variant);
7310
7311                 T(YAFFS_TRACE_BACKGROUND, (TSTR("Update directory %d" TENDSTR), obj->objectId));
7312
7313                 if(obj->dirty)
7314                         yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
7315         }
7316 }
7317
7318 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
7319 {
7320         yaffs_Device *dev = obj->myDev;
7321         yaffs_Object *parent;
7322
7323         yaffs_VerifyObjectInDirectory(obj);
7324         parent = obj->parent;
7325
7326         yaffs_VerifyDirectory(parent);
7327
7328         if (dev && dev->param.removeObjectCallback)
7329                 dev->param.removeObjectCallback(obj);
7330
7331
7332         ylist_del_init(&obj->siblings);
7333         obj->parent = NULL;
7334
7335         yaffs_VerifyDirectory(parent);
7336 }
7337
7338 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
7339                                         yaffs_Object *obj)
7340 {
7341         if (!directory) {
7342                 T(YAFFS_TRACE_ALWAYS,
7343                   (TSTR
7344                    ("tragedy: Trying to add an object to a null pointer directory"
7345                     TENDSTR)));
7346                 YBUG();
7347                 return;
7348         }
7349         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7350                 T(YAFFS_TRACE_ALWAYS,
7351                   (TSTR
7352                    ("tragedy: Trying to add an object to a non-directory"
7353                     TENDSTR)));
7354                 YBUG();
7355         }
7356
7357         if (obj->siblings.prev == NULL) {
7358                 /* Not initialised */
7359                 YBUG();
7360         }
7361
7362
7363         yaffs_VerifyDirectory(directory);
7364
7365         yaffs_RemoveObjectFromDirectory(obj);
7366
7367
7368         /* Now add it */
7369         ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
7370         obj->parent = directory;
7371
7372         if (directory == obj->myDev->unlinkedDir
7373                         || directory == obj->myDev->deletedDir) {
7374                 obj->unlinked = 1;
7375                 obj->myDev->nUnlinkedFiles++;
7376                 obj->renameAllowed = 0;
7377         }
7378
7379         yaffs_VerifyDirectory(directory);
7380         yaffs_VerifyObjectInDirectory(obj);
7381 }
7382
7383 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
7384                                      const YCHAR *name)
7385 {
7386         int sum;
7387
7388         struct ylist_head *i;
7389         YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
7390
7391         yaffs_Object *l;
7392
7393         if (!name)
7394                 return NULL;
7395
7396         if (!directory) {
7397                 T(YAFFS_TRACE_ALWAYS,
7398                   (TSTR
7399                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
7400                     TENDSTR)));
7401                 YBUG();
7402                 return NULL;
7403         }
7404         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7405                 T(YAFFS_TRACE_ALWAYS,
7406                   (TSTR
7407                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7408                 YBUG();
7409         }
7410
7411         sum = yaffs_CalcNameSum(name);
7412
7413         ylist_for_each(i, &directory->variant.directoryVariant.children) {
7414                 if (i) {
7415                         l = ylist_entry(i, yaffs_Object, siblings);
7416
7417                         if (l->parent != directory)
7418                                 YBUG();
7419
7420                         yaffs_CheckObjectDetailsLoaded(l);
7421
7422                         /* Special case for lost-n-found */
7423                         if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7424                                 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
7425                                         return l;
7426                         } else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
7427                                 /* LostnFound chunk called Objxxx
7428                                  * Do a real check
7429                                  */
7430                                 yaffs_GetObjectName(l, buffer,
7431                                                     YAFFS_MAX_NAME_LENGTH + 1);
7432                                 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
7433                                         return l;
7434                         }
7435                 }
7436         }
7437
7438         return NULL;
7439 }
7440
7441
7442 #if 0
7443 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
7444                                         int (*fn) (yaffs_Object *))
7445 {
7446         struct ylist_head *i;
7447         yaffs_Object *l;
7448
7449         if (!theDir) {
7450                 T(YAFFS_TRACE_ALWAYS,
7451                   (TSTR
7452                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
7453                     TENDSTR)));
7454                 YBUG();
7455                 return YAFFS_FAIL;
7456         }
7457         if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7458                 T(YAFFS_TRACE_ALWAYS,
7459                   (TSTR
7460                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7461                 YBUG();
7462                 return YAFFS_FAIL;
7463         }
7464
7465         ylist_for_each(i, &theDir->variant.directoryVariant.children) {
7466                 if (i) {
7467                         l = ylist_entry(i, yaffs_Object, siblings);
7468                         if (l && !fn(l))
7469                                 return YAFFS_FAIL;
7470                 }
7471         }
7472
7473         return YAFFS_OK;
7474
7475 }
7476 #endif
7477
7478 /* GetEquivalentObject dereferences any hard links to get to the
7479  * actual object.
7480  */
7481
7482 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
7483 {
7484         if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
7485                 /* We want the object id of the equivalent object, not this one */
7486                 obj = obj->variant.hardLinkVariant.equivalentObject;
7487                 yaffs_CheckObjectDetailsLoaded(obj);
7488         }
7489         return obj;
7490 }
7491
7492 int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
7493 {
7494         memset(name, 0, buffSize * sizeof(YCHAR));
7495
7496         yaffs_CheckObjectDetailsLoaded(obj);
7497
7498         if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7499                 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
7500         } else if (obj->hdrChunk <= 0) {
7501                 YCHAR locName[20];
7502                 YCHAR numString[20];
7503                 YCHAR *x = &numString[19];
7504                 unsigned v = obj->objectId;
7505                 numString[19] = 0;
7506                 while (v > 0) {
7507                         x--;
7508                         *x = '0' + (v % 10);
7509                         v /= 10;
7510                 }
7511                 /* make up a name */
7512                 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
7513                 yaffs_strcat(locName, x);
7514                 yaffs_strncpy(name, locName, buffSize - 1);
7515
7516         }
7517 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
7518         else if (obj->shortName[0])
7519                 yaffs_strncpy(name, obj->shortName,YAFFS_SHORT_NAME_LENGTH+1);
7520 #endif
7521         else {
7522                 int result;
7523                 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
7524
7525                 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
7526
7527                 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
7528
7529                 if (obj->hdrChunk > 0) {
7530                         result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
7531                                                         obj->hdrChunk, buffer,
7532                                                         NULL);
7533                 }
7534                 yaffs_strncpy(name, oh->name, buffSize - 1);
7535                 name[buffSize-1]=0;
7536
7537                 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
7538         }
7539
7540         return yaffs_strnlen(name,buffSize-1);
7541 }
7542
7543 int yaffs_GetObjectFileLength(yaffs_Object *obj)
7544 {
7545         /* Dereference any hard linking */
7546         obj = yaffs_GetEquivalentObject(obj);
7547
7548         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
7549                 return obj->variant.fileVariant.fileSize;
7550         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
7551                 if(!obj->variant.symLinkVariant.alias)
7552                         return 0;
7553                 return yaffs_strnlen(obj->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
7554         } else {
7555                 /* Only a directory should drop through to here */
7556                 return obj->myDev->nDataBytesPerChunk;
7557         }
7558 }
7559
7560 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
7561 {
7562         int count = 0;
7563         struct ylist_head *i;
7564
7565         if (!obj->unlinked)
7566                 count++;                /* the object itself */
7567
7568         ylist_for_each(i, &obj->hardLinks)
7569                 count++;                /* add the hard links; */
7570
7571         return count;
7572 }
7573
7574 int yaffs_GetObjectInode(yaffs_Object *obj)
7575 {
7576         obj = yaffs_GetEquivalentObject(obj);
7577
7578         return obj->objectId;
7579 }
7580
7581 unsigned yaffs_GetObjectType(yaffs_Object *obj)
7582 {
7583         obj = yaffs_GetEquivalentObject(obj);
7584
7585         switch (obj->variantType) {
7586         case YAFFS_OBJECT_TYPE_FILE:
7587                 return DT_REG;
7588                 break;
7589         case YAFFS_OBJECT_TYPE_DIRECTORY:
7590                 return DT_DIR;
7591                 break;
7592         case YAFFS_OBJECT_TYPE_SYMLINK:
7593                 return DT_LNK;
7594                 break;
7595         case YAFFS_OBJECT_TYPE_HARDLINK:
7596                 return DT_REG;
7597                 break;
7598         case YAFFS_OBJECT_TYPE_SPECIAL:
7599                 if (S_ISFIFO(obj->yst_mode))
7600                         return DT_FIFO;
7601                 if (S_ISCHR(obj->yst_mode))
7602                         return DT_CHR;
7603                 if (S_ISBLK(obj->yst_mode))
7604                         return DT_BLK;
7605                 if (S_ISSOCK(obj->yst_mode))
7606                         return DT_SOCK;
7607         default:
7608                 return DT_REG;
7609                 break;
7610         }
7611 }
7612
7613 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
7614 {
7615         obj = yaffs_GetEquivalentObject(obj);
7616         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
7617                 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
7618         else
7619                 return yaffs_CloneString(_Y(""));
7620 }
7621
7622 #ifndef CONFIG_YAFFS_WINCE
7623
7624 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
7625 {
7626         unsigned int valid = attr->ia_valid;
7627
7628         if (valid & ATTR_MODE)
7629                 obj->yst_mode = attr->ia_mode;
7630         if (valid & ATTR_UID)
7631                 obj->yst_uid = attr->ia_uid;
7632         if (valid & ATTR_GID)
7633                 obj->yst_gid = attr->ia_gid;
7634
7635         if (valid & ATTR_ATIME)
7636                 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
7637         if (valid & ATTR_CTIME)
7638                 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
7639         if (valid & ATTR_MTIME)
7640                 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
7641
7642         if (valid & ATTR_SIZE)
7643                 yaffs_ResizeFile(obj, attr->ia_size);
7644
7645         yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
7646
7647         return YAFFS_OK;
7648
7649 }
7650 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
7651 {
7652         unsigned int valid = 0;
7653
7654         attr->ia_mode = obj->yst_mode;
7655         valid |= ATTR_MODE;
7656         attr->ia_uid = obj->yst_uid;
7657         valid |= ATTR_UID;
7658         attr->ia_gid = obj->yst_gid;
7659         valid |= ATTR_GID;
7660
7661         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
7662         valid |= ATTR_ATIME;
7663         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
7664         valid |= ATTR_CTIME;
7665         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
7666         valid |= ATTR_MTIME;
7667
7668         attr->ia_size = yaffs_GetFileSize(obj);
7669         valid |= ATTR_SIZE;
7670
7671         attr->ia_valid = valid;
7672
7673         return YAFFS_OK;
7674 }
7675
7676 #endif
7677
7678 #if 0
7679 int yaffs_DumpObject(yaffs_Object *obj)
7680 {
7681         YCHAR name[257];
7682
7683         yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
7684
7685         T(YAFFS_TRACE_ALWAYS,
7686           (TSTR
7687            ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
7688             " chunk %d type %d size %d\n"
7689             TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
7690            obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
7691            yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
7692
7693         return YAFFS_OK;
7694 }
7695 #endif
7696
7697 /*---------------------------- Initialisation code -------------------------------------- */
7698
7699 static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
7700 {
7701
7702         /* Common functions, gotta have */
7703         if (!dev->param.eraseBlockInNAND || !dev->param.initialiseNAND)
7704                 return 0;
7705
7706 #ifdef CONFIG_YAFFS_YAFFS2
7707
7708         /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
7709         if (dev->param.writeChunkWithTagsToNAND &&
7710             dev->param.readChunkWithTagsFromNAND &&
7711             !dev->param.writeChunkToNAND &&
7712             !dev->param.readChunkFromNAND &&
7713             dev->param.markNANDBlockBad &&
7714             dev->param.queryNANDBlock)
7715                 return 1;
7716 #endif
7717
7718         /* Can use the "spare" style interface for yaffs1 */
7719         if (!dev->param.isYaffs2 &&
7720             !dev->param.writeChunkWithTagsToNAND &&
7721             !dev->param.readChunkWithTagsFromNAND &&
7722             dev->param.writeChunkToNAND &&
7723             dev->param.readChunkFromNAND &&
7724             !dev->param.markNANDBlockBad &&
7725             !dev->param.queryNANDBlock)
7726                 return 1;
7727
7728         return 0;       /* bad */
7729 }
7730
7731
7732 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7733 {
7734         /* Initialise the unlinked, deleted, root and lost and found directories */
7735
7736         dev->lostNFoundDir = dev->rootDir =  NULL;
7737         dev->unlinkedDir = dev->deletedDir = NULL;
7738
7739         dev->unlinkedDir =
7740             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7741
7742         dev->deletedDir =
7743             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7744
7745         dev->rootDir =
7746             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7747                                       YAFFS_ROOT_MODE | S_IFDIR);
7748         dev->lostNFoundDir =
7749             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7750                                       YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7751
7752         if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
7753                 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7754                 return YAFFS_OK;
7755         }
7756
7757         return YAFFS_FAIL;
7758 }
7759
7760 int yaffs_GutsInitialise(yaffs_Device *dev)
7761 {
7762         int init_failed = 0;
7763         unsigned x;
7764         int bits;
7765
7766         T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7767
7768         /* Check stuff that must be set */
7769
7770         if (!dev) {
7771                 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7772                 return YAFFS_FAIL;
7773         }
7774
7775         dev->internalStartBlock = dev->param.startBlock;
7776         dev->internalEndBlock = dev->param.endBlock;
7777         dev->blockOffset = 0;
7778         dev->chunkOffset = 0;
7779         dev->nFreeChunks = 0;
7780
7781         dev->gcBlock = 0;
7782
7783         if (dev->param.startBlock == 0) {
7784                 dev->internalStartBlock = dev->param.startBlock + 1;
7785                 dev->internalEndBlock = dev->param.endBlock + 1;
7786                 dev->blockOffset = 1;
7787                 dev->chunkOffset = dev->param.nChunksPerBlock;
7788         }
7789
7790         /* Check geometry parameters. */
7791
7792         if ((!dev->param.inbandTags && dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 1024) ||
7793             (!dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 512) ||
7794             (dev->param.inbandTags && !dev->param.isYaffs2) ||
7795              dev->param.nChunksPerBlock < 2 ||
7796              dev->param.nReservedBlocks < 2 ||
7797              dev->internalStartBlock <= 0 ||
7798              dev->internalEndBlock <= 0 ||
7799              dev->internalEndBlock <= (dev->internalStartBlock + dev->param.nReservedBlocks + 2)) {     /* otherwise it is too small */
7800                 T(YAFFS_TRACE_ALWAYS,
7801                   (TSTR
7802                    ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
7803                     TENDSTR), dev->param.totalBytesPerChunk, dev->param.isYaffs2 ? "2" : "", dev->param.inbandTags));
7804                 return YAFFS_FAIL;
7805         }
7806
7807         if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7808                 T(YAFFS_TRACE_ALWAYS,
7809                   (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7810                 return YAFFS_FAIL;
7811         }
7812
7813         /* Sort out space for inband tags, if required */
7814         if (dev->param.inbandTags)
7815                 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
7816         else
7817                 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk;
7818
7819         /* Got the right mix of functions? */
7820         if (!yaffs_CheckDevFunctions(dev)) {
7821                 /* Function missing */
7822                 T(YAFFS_TRACE_ALWAYS,
7823                   (TSTR
7824                    ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7825
7826                 return YAFFS_FAIL;
7827         }
7828
7829         /* This is really a compilation check. */
7830         if (!yaffs_CheckStructures()) {
7831                 T(YAFFS_TRACE_ALWAYS,
7832                   (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7833                 return YAFFS_FAIL;
7834         }
7835
7836         if (dev->isMounted) {
7837                 T(YAFFS_TRACE_ALWAYS,
7838                   (TSTR("yaffs: device already mounted\n" TENDSTR)));
7839                 return YAFFS_FAIL;
7840         }
7841
7842         /* Finished with most checks. One or two more checks happen later on too. */
7843
7844         dev->isMounted = 1;
7845
7846         /* OK now calculate a few things for the device */
7847
7848         /*
7849          *  Calculate all the chunk size manipulation numbers:
7850          */
7851         x = dev->nDataBytesPerChunk;
7852         /* We always use dev->chunkShift and dev->chunkDiv */
7853         dev->chunkShift = Shifts(x);
7854         x >>= dev->chunkShift;
7855         dev->chunkDiv = x;
7856         /* We only use chunk mask if chunkDiv is 1 */
7857         dev->chunkMask = (1<<dev->chunkShift) - 1;
7858
7859         /*
7860          * Calculate chunkGroupBits.
7861          * We need to find the next power of 2 > than internalEndBlock
7862          */
7863
7864         x = dev->param.nChunksPerBlock * (dev->internalEndBlock + 1);
7865
7866         bits = ShiftsGE(x);
7867
7868         /* Set up tnode width if wide tnodes are enabled. */
7869         if (!dev->param.wideTnodesDisabled) {
7870                 /* bits must be even so that we end up with 32-bit words */
7871                 if (bits & 1)
7872                         bits++;
7873                 if (bits < 16)
7874                         dev->tnodeWidth = 16;
7875                 else
7876                         dev->tnodeWidth = bits;
7877         } else
7878                 dev->tnodeWidth = 16;
7879
7880         dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7881
7882         /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7883          * so if the bitwidth of the
7884          * chunk range we're using is greater than 16 we need
7885          * to figure out chunk shift and chunkGroupSize
7886          */
7887
7888         if (bits <= dev->tnodeWidth)
7889                 dev->chunkGroupBits = 0;
7890         else
7891                 dev->chunkGroupBits = bits - dev->tnodeWidth;
7892
7893
7894         dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7895
7896         if (dev->param.nChunksPerBlock < dev->chunkGroupSize) {
7897                 /* We have a problem because the soft delete won't work if
7898                  * the chunk group size > chunks per block.
7899                  * This can be remedied by using larger "virtual blocks".
7900                  */
7901                 T(YAFFS_TRACE_ALWAYS,
7902                   (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7903
7904                 return YAFFS_FAIL;
7905         }
7906
7907         /* OK, we've finished verifying the device, lets continue with initialisation */
7908
7909         /* More device initialisation */
7910         dev->garbageCollections = 0;
7911         dev->passiveGarbageCollections = 0;
7912         dev->gcBlockFinder = 0;
7913         dev->bufferedBlock = -1;
7914         dev->doingBufferedBlockRewrite = 0;
7915         dev->nDeletedFiles = 0;
7916         dev->nBackgroundDeletions = 0;
7917         dev->nUnlinkedFiles = 0;
7918         dev->eccFixed = 0;
7919         dev->eccUnfixed = 0;
7920         dev->tagsEccFixed = 0;
7921         dev->tagsEccUnfixed = 0;
7922         dev->nErasureFailures = 0;
7923         dev->nErasedBlocks = 0;
7924         dev->gcDisable= 0;
7925         dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7926         YINIT_LIST_HEAD(&dev->dirtyDirectories);
7927         dev->oldestDirtySequence = 0;
7928         dev->oldestDirtyBlock = 0;
7929
7930         /* Initialise temporary buffers and caches. */
7931         if (!yaffs_InitialiseTempBuffers(dev))
7932                 init_failed = 1;
7933
7934         dev->srCache = NULL;
7935         dev->gcCleanupList = NULL;
7936
7937
7938         if (!init_failed &&
7939             dev->param.nShortOpCaches > 0) {
7940                 int i;
7941                 void *buf;
7942                 int srCacheBytes = dev->param.nShortOpCaches * sizeof(yaffs_ChunkCache);
7943
7944                 if (dev->param.nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
7945                         dev->param.nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7946
7947                 dev->srCache =  YMALLOC(srCacheBytes);
7948
7949                 buf = (__u8 *) dev->srCache;
7950
7951                 if (dev->srCache)
7952                         memset(dev->srCache, 0, srCacheBytes);
7953
7954                 for (i = 0; i < dev->param.nShortOpCaches && buf; i++) {
7955                         dev->srCache[i].object = NULL;
7956                         dev->srCache[i].lastUse = 0;
7957                         dev->srCache[i].dirty = 0;
7958                         dev->srCache[i].data = buf = YMALLOC_DMA(dev->param.totalBytesPerChunk);
7959                 }
7960                 if (!buf)
7961                         init_failed = 1;
7962
7963                 dev->srLastUse = 0;
7964         }
7965
7966         dev->cacheHits = 0;
7967
7968         if (!init_failed) {
7969                 dev->gcCleanupList = YMALLOC(dev->param.nChunksPerBlock * sizeof(__u32));
7970                 if (!dev->gcCleanupList)
7971                         init_failed = 1;
7972         }
7973
7974         if (dev->param.isYaffs2)
7975                 dev->param.useHeaderFileSize = 1;
7976
7977         if (!init_failed && !yaffs_InitialiseBlocks(dev))
7978                 init_failed = 1;
7979
7980         yaffs_InitialiseTnodes(dev);
7981         yaffs_InitialiseObjects(dev);
7982
7983         if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7984                 init_failed = 1;
7985
7986
7987         if (!init_failed) {
7988                 /* Now scan the flash. */
7989                 if (dev->param.isYaffs2) {
7990                         if (yaffs_CheckpointRestore(dev)) {
7991                                 yaffs_CheckObjectDetailsLoaded(dev->rootDir);
7992                                 T(YAFFS_TRACE_ALWAYS,
7993                                   (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7994                         } else {
7995
7996                                 /* Clean up the mess caused by an aborted checkpoint load
7997                                  * and scan backwards.
7998                                  */
7999                                 yaffs_DeinitialiseBlocks(dev);
8000                                 yaffs_DeinitialiseTnodes(dev);
8001                                 yaffs_DeinitialiseObjects(dev);
8002
8003
8004                                 dev->nErasedBlocks = 0;
8005                                 dev->nFreeChunks = 0;
8006                                 dev->allocationBlock = -1;
8007                                 dev->allocationPage = -1;
8008                                 dev->nDeletedFiles = 0;
8009                                 dev->nUnlinkedFiles = 0;
8010                                 dev->nBackgroundDeletions = 0;
8011
8012                                 if (!init_failed && !yaffs_InitialiseBlocks(dev))
8013                                         init_failed = 1;
8014
8015                                 yaffs_InitialiseTnodes(dev);
8016                                 yaffs_InitialiseObjects(dev);
8017
8018                                 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
8019                                         init_failed = 1;
8020
8021                                 if (!init_failed && !yaffs_ScanBackwards(dev))
8022                                         init_failed = 1;
8023                         }
8024                 } else if (!yaffs_Scan(dev))
8025                                 init_failed = 1;
8026
8027                 yaffs_StripDeletedObjects(dev);
8028                 yaffs_FixHangingObjects(dev);
8029                 if(dev->param.emptyLostAndFound)
8030                         yaffs_EmptyLostAndFound(dev);
8031         }
8032
8033         if (init_failed) {
8034                 /* Clean up the mess */
8035                 T(YAFFS_TRACE_TRACING,
8036                   (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
8037
8038                 yaffs_Deinitialise(dev);
8039                 return YAFFS_FAIL;
8040         }
8041
8042         /* Zero out stats */
8043         dev->nPageReads = 0;
8044         dev->nPageWrites = 0;
8045         dev->nBlockErasures = 0;
8046         dev->nGCCopies = 0;
8047         dev->nRetriedWrites = 0;
8048
8049         dev->nRetiredBlocks = 0;
8050
8051         yaffs_VerifyFreeChunks(dev);
8052         yaffs_VerifyBlocks(dev);
8053
8054         /* Clean up any aborted checkpoint data */
8055         if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
8056                 yaffs_InvalidateCheckpoint(dev);
8057
8058         T(YAFFS_TRACE_TRACING,
8059           (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
8060         return YAFFS_OK;
8061
8062 }
8063
8064 void yaffs_Deinitialise(yaffs_Device *dev)
8065 {
8066         if (dev->isMounted) {
8067                 int i;
8068
8069                 yaffs_DeinitialiseBlocks(dev);
8070                 yaffs_DeinitialiseTnodes(dev);
8071                 yaffs_DeinitialiseObjects(dev);
8072                 if (dev->param.nShortOpCaches > 0 &&
8073                     dev->srCache) {
8074
8075                         for (i = 0; i < dev->param.nShortOpCaches; i++) {
8076                                 if (dev->srCache[i].data)
8077                                         YFREE(dev->srCache[i].data);
8078                                 dev->srCache[i].data = NULL;
8079                         }
8080
8081                         YFREE(dev->srCache);
8082                         dev->srCache = NULL;
8083                 }
8084
8085                 YFREE(dev->gcCleanupList);
8086
8087                 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
8088                         YFREE(dev->tempBuffer[i].buffer);
8089
8090                 dev->isMounted = 0;
8091
8092                 if (dev->param.deinitialiseNAND)
8093                         dev->param.deinitialiseNAND(dev);
8094         }
8095 }
8096
8097 static int yaffs_CountFreeChunks(yaffs_Device *dev)
8098 {
8099         int nFree=0;
8100         int b;
8101
8102         yaffs_BlockInfo *blk;
8103
8104         blk = dev->blockInfo;
8105         for (b = dev->internalStartBlock; b <= dev->internalEndBlock; b++) {
8106                 switch (blk->blockState) {
8107                 case YAFFS_BLOCK_STATE_EMPTY:
8108                 case YAFFS_BLOCK_STATE_ALLOCATING:
8109                 case YAFFS_BLOCK_STATE_COLLECTING:
8110                 case YAFFS_BLOCK_STATE_FULL:
8111                         nFree +=
8112                             (dev->param.nChunksPerBlock - blk->pagesInUse +
8113                              blk->softDeletions);
8114                         break;
8115                 default:
8116                         break;
8117                 }
8118                 blk++;
8119         }
8120
8121         return nFree;
8122 }
8123
8124 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
8125 {
8126         /* This is what we report to the outside world */
8127
8128         int nFree;
8129         int nDirtyCacheChunks;
8130         int blocksForCheckpoint;
8131         int i;
8132
8133 #if 1
8134         nFree = dev->nFreeChunks;
8135 #else
8136         nFree = yaffs_CountFreeChunks(dev);
8137 #endif
8138
8139         nFree += dev->nDeletedFiles;
8140
8141         /* Now count the number of dirty chunks in the cache and subtract those */
8142
8143         for (nDirtyCacheChunks = 0, i = 0; i < dev->param.nShortOpCaches; i++) {
8144                 if (dev->srCache[i].dirty)
8145                         nDirtyCacheChunks++;
8146         }
8147
8148         nFree -= nDirtyCacheChunks;
8149
8150         nFree -= ((dev->param.nReservedBlocks + 1) * dev->param.nChunksPerBlock);
8151
8152         /* Now we figure out how much to reserve for the checkpoint and report that... */
8153         blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
8154         if (blocksForCheckpoint < 0)
8155                 blocksForCheckpoint = 0;
8156
8157         nFree -= (blocksForCheckpoint * dev->param.nChunksPerBlock);
8158
8159         if (nFree < 0)
8160                 nFree = 0;
8161
8162         return nFree;
8163
8164 }
8165
8166 static int yaffs_freeVerificationFailures;
8167
8168 static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
8169 {
8170         int counted;
8171         int difference;
8172
8173         if (yaffs_SkipVerification(dev))
8174                 return;
8175
8176         counted = yaffs_CountFreeChunks(dev);
8177
8178         difference = dev->nFreeChunks - counted;
8179
8180         if (difference) {
8181                 T(YAFFS_TRACE_ALWAYS,
8182                   (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
8183                    dev->nFreeChunks, counted, difference));
8184                 yaffs_freeVerificationFailures++;
8185         }
8186 }
8187
8188 /*---------------------------------------- YAFFS test code ----------------------*/
8189
8190 #define yaffs_CheckStruct(structure, syze, name) \
8191         do { \
8192                 if (sizeof(structure) != syze) { \
8193                         T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
8194                                 name, syze, (int) sizeof(structure))); \
8195                         return YAFFS_FAIL; \
8196                 } \
8197         } while (0)
8198
8199 static int yaffs_CheckStructures(void)
8200 {
8201 /*      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
8202 /*      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
8203 /*      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
8204 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
8205 /*      yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode"); */
8206 #endif
8207 #ifndef CONFIG_YAFFS_WINCE
8208         yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");
8209 #endif
8210         return YAFFS_OK;
8211 }