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