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 1.119 2010-03-12 02:48:34 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 (!bi->needsRetiring) {
2947                 yaffs_InvalidateCheckpoint(dev);
2948                 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2949                 if (!erasedOk) {
2950                         dev->nErasureFailures++;
2951                         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2952                           (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2953                 }
2954         }
2955
2956         if (erasedOk &&
2957             ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2958                 int i;
2959                 for (i = 0; i < dev->param.nChunksPerBlock; i++) {
2960                         if (!yaffs_CheckChunkErased
2961                             (dev, blockNo * dev->param.nChunksPerBlock + i)) {
2962                                 T(YAFFS_TRACE_ERROR,
2963                                   (TSTR
2964                                    (">>Block %d erasure supposedly OK, but chunk %d not erased"
2965                                     TENDSTR), blockNo, i));
2966                         }
2967                 }
2968         }
2969
2970         if (erasedOk) {
2971                 /* Clean it up... */
2972                 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2973                 bi->sequenceNumber = 0;
2974                 dev->nErasedBlocks++;
2975                 bi->pagesInUse = 0;
2976                 bi->softDeletions = 0;
2977                 bi->hasShrinkHeader = 0;
2978                 bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
2979                 bi->gcPrioritise = 0;
2980                 yaffs_ClearChunkBits(dev, blockNo);
2981
2982                 T(YAFFS_TRACE_ERASE,
2983                   (TSTR("Erased block %d" TENDSTR), blockNo));
2984         } else {
2985                 dev->nFreeChunks -= dev->param.nChunksPerBlock; /* We lost a block of free space */
2986
2987                 yaffs_RetireBlock(dev, blockNo);
2988                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2989                   (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2990         }
2991 }
2992
2993 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2994 {
2995         int i;
2996
2997         yaffs_BlockInfo *bi;
2998
2999         if (dev->nErasedBlocks < 1) {
3000                 /* Hoosterman we've got a problem.
3001                  * Can't get space to gc
3002                  */
3003                 T(YAFFS_TRACE_ERROR,
3004                   (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
3005
3006                 return -1;
3007         }
3008
3009         /* Find an empty block. */
3010
3011         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
3012                 dev->allocationBlockFinder++;
3013                 if (dev->allocationBlockFinder < dev->internalStartBlock
3014                     || dev->allocationBlockFinder > dev->internalEndBlock) {
3015                         dev->allocationBlockFinder = dev->internalStartBlock;
3016                 }
3017
3018                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
3019
3020                 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
3021                         bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
3022                         dev->sequenceNumber++;
3023                         bi->sequenceNumber = dev->sequenceNumber;
3024                         dev->nErasedBlocks--;
3025                         T(YAFFS_TRACE_ALLOCATE,
3026                           (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
3027                            dev->allocationBlockFinder, dev->sequenceNumber,
3028                            dev->nErasedBlocks));
3029                         return dev->allocationBlockFinder;
3030                 }
3031         }
3032
3033         T(YAFFS_TRACE_ALWAYS,
3034           (TSTR
3035            ("yaffs tragedy: no more erased blocks, but there should have been %d"
3036             TENDSTR), dev->nErasedBlocks));
3037
3038         return -1;
3039 }
3040
3041
3042
3043 static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
3044 {
3045         if (!dev->nCheckpointBlocksRequired &&
3046            dev->param.isYaffs2) {
3047                 /* Not a valid value so recalculate */
3048                 int nBytes = 0;
3049                 int nBlocks;
3050                 int devBlocks = (dev->param.endBlock - dev->param.startBlock + 1);
3051                 int tnodeSize = yaffs_CalcTnodeSize(dev);
3052
3053                 nBytes += sizeof(yaffs_CheckpointValidity);
3054                 nBytes += sizeof(yaffs_CheckpointDevice);
3055                 nBytes += devBlocks * sizeof(yaffs_BlockInfo);
3056                 nBytes += devBlocks * dev->chunkBitmapStride;
3057                 nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
3058                 nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
3059                 nBytes += sizeof(yaffs_CheckpointValidity);
3060                 nBytes += sizeof(__u32); /* checksum*/
3061
3062                 /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
3063
3064                 nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->param.nChunksPerBlock)) + 3;
3065
3066                 dev->nCheckpointBlocksRequired = nBlocks;
3067         }
3068
3069         return dev->nCheckpointBlocksRequired;
3070 }
3071
3072 /*
3073  * Check if there's space to allocate...
3074  * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
3075  */
3076 static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev, int nChunks)
3077 {
3078         int reservedChunks;
3079         int reservedBlocks = dev->param.nReservedBlocks;
3080         int checkpointBlocks;
3081
3082         if (dev->param.isYaffs2) {
3083                 checkpointBlocks =  yaffs_CalcCheckpointBlocksRequired(dev) -
3084                                     dev->blocksInCheckpoint;
3085                 if (checkpointBlocks < 0)
3086                         checkpointBlocks = 0;
3087         } else {
3088                 checkpointBlocks = 0;
3089         }
3090
3091         reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.nChunksPerBlock);
3092
3093         return (dev->nFreeChunks > (reservedChunks + nChunks));
3094 }
3095
3096 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
3097                 yaffs_BlockInfo **blockUsedPtr)
3098 {
3099         int retVal;
3100         yaffs_BlockInfo *bi;
3101
3102         if (dev->allocationBlock < 0) {
3103                 /* Get next block to allocate off */
3104                 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
3105                 dev->allocationPage = 0;
3106         }
3107
3108         if (!useReserve && !yaffs_CheckSpaceForAllocation(dev, 1)) {
3109                 /* Not enough space to allocate unless we're allowed to use the reserve. */
3110                 return -1;
3111         }
3112
3113         if (dev->nErasedBlocks < dev->param.nReservedBlocks
3114                         && dev->allocationPage == 0) {
3115                 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
3116         }
3117
3118         /* Next page please.... */
3119         if (dev->allocationBlock >= 0) {
3120                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3121
3122                 retVal = (dev->allocationBlock * dev->param.nChunksPerBlock) +
3123                         dev->allocationPage;
3124                 bi->pagesInUse++;
3125                 yaffs_SetChunkBit(dev, dev->allocationBlock,
3126                                 dev->allocationPage);
3127
3128                 dev->allocationPage++;
3129
3130                 dev->nFreeChunks--;
3131
3132                 /* If the block is full set the state to full */
3133                 if (dev->allocationPage >= dev->param.nChunksPerBlock) {
3134                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
3135                         dev->allocationBlock = -1;
3136                 }
3137
3138                 if (blockUsedPtr)
3139                         *blockUsedPtr = bi;
3140
3141                 return retVal;
3142         }
3143
3144         T(YAFFS_TRACE_ERROR,
3145                         (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
3146
3147         return -1;
3148 }
3149
3150 static int yaffs_GetErasedChunks(yaffs_Device *dev)
3151 {
3152         int n;
3153
3154         n = dev->nErasedBlocks * dev->param.nChunksPerBlock;
3155
3156         if (dev->allocationBlock > 0)
3157                 n += (dev->param.nChunksPerBlock - dev->allocationPage);
3158
3159         return n;
3160
3161 }
3162
3163 /*
3164  * yaffs_SkipRestOfBlock() skips over the rest of the allocation block
3165  * if we don't want to write to it.
3166  */
3167 static void yaffs_SkipRestOfBlock(yaffs_Device *dev)
3168 {
3169         if(dev->allocationBlock > 0){
3170                 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3171                 if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){
3172                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
3173                         dev->allocationBlock = -1;
3174                 }
3175         }
3176 }
3177
3178
3179 static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
3180                 int wholeBlock)
3181 {
3182         int oldChunk;
3183         int newChunk;
3184         int markNAND;
3185         int retVal = YAFFS_OK;
3186         int cleanups = 0;
3187         int i;
3188         int isCheckpointBlock;
3189         int matchingChunk;
3190         int maxCopies;
3191
3192         int chunksBefore = yaffs_GetErasedChunks(dev);
3193         int chunksAfter;
3194
3195         yaffs_ExtendedTags tags;
3196
3197         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
3198
3199         yaffs_Object *object;
3200
3201         isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
3202
3203
3204         T(YAFFS_TRACE_TRACING,
3205                         (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
3206                          block,
3207                          bi->pagesInUse,
3208                          bi->hasShrinkHeader,
3209                          wholeBlock));
3210
3211         /*yaffs_VerifyFreeChunks(dev); */
3212
3213         if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
3214                 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
3215
3216         bi->hasShrinkHeader = 0;        /* clear the flag so that the block can erase */
3217
3218         /* Take off the number of soft deleted entries because
3219          * they're going to get really deleted during GC.
3220          */
3221         if(dev->gcChunk == 0) /* first time through for this block */
3222                 dev->nFreeChunks -= bi->softDeletions;
3223
3224         dev->isDoingGC = 1;
3225
3226         if (isCheckpointBlock ||
3227                         !yaffs_StillSomeChunkBits(dev, block)) {
3228                 T(YAFFS_TRACE_TRACING,
3229                                 (TSTR
3230                                  ("Collecting block %d that has no chunks in use" TENDSTR),
3231                                  block));
3232                 yaffs_BlockBecameDirty(dev, block);
3233         } else {
3234
3235                 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
3236
3237                 yaffs_VerifyBlock(dev, bi, block);
3238
3239                 maxCopies = (wholeBlock) ? dev->param.nChunksPerBlock : 10;
3240                 oldChunk = block * dev->param.nChunksPerBlock + dev->gcChunk;
3241
3242                 for (/* init already done */;
3243                      retVal == YAFFS_OK &&
3244                      dev->gcChunk < dev->param.nChunksPerBlock &&
3245                      (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
3246                      maxCopies > 0;
3247                      dev->gcChunk++, oldChunk++) {
3248                         if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
3249
3250                                 /* This page is in use and might need to be copied off */
3251
3252                                 maxCopies--;
3253
3254                                 markNAND = 1;
3255
3256                                 yaffs_InitialiseTags(&tags);
3257
3258                                 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
3259                                                                 buffer, &tags);
3260
3261                                 object =
3262                                     yaffs_FindObjectByNumber(dev,
3263                                                              tags.objectId);
3264
3265                                 T(YAFFS_TRACE_GC_DETAIL,
3266                                   (TSTR
3267                                    ("Collecting chunk in block %d, %d %d %d " TENDSTR),
3268                                    dev->gcChunk, tags.objectId, tags.chunkId,
3269                                    tags.byteCount));
3270
3271                                 if (object && !yaffs_SkipVerification(dev)) {
3272                                         if (tags.chunkId == 0)
3273                                                 matchingChunk = object->hdrChunk;
3274                                         else if (object->softDeleted)
3275                                                 matchingChunk = oldChunk; /* Defeat the test */
3276                                         else
3277                                                 matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
3278
3279                                         if (oldChunk != matchingChunk)
3280                                                 T(YAFFS_TRACE_ERROR,
3281                                                   (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
3282                                                   oldChunk, matchingChunk, tags.objectId, tags.chunkId));
3283
3284                                 }
3285
3286                                 if (!object) {
3287                                         T(YAFFS_TRACE_ERROR,
3288                                           (TSTR
3289                                            ("page %d in gc has no object: %d %d %d "
3290                                             TENDSTR), oldChunk,
3291                                             tags.objectId, tags.chunkId, tags.byteCount));
3292                                 }
3293
3294                                 if (object &&
3295                                     object->deleted &&
3296                                     object->softDeleted &&
3297                                     tags.chunkId != 0) {
3298                                         /* Data chunk in a soft deleted file, throw it away
3299                                          * It's a soft deleted data chunk,
3300                                          * No need to copy this, just forget about it and
3301                                          * fix up the object.
3302                                          */
3303
3304                                         object->nDataChunks--;
3305
3306                                         if (object->nDataChunks <= 0) {
3307                                                 /* remeber to clean up the object */
3308                                                 dev->gcCleanupList[cleanups] =
3309                                                     tags.objectId;
3310                                                 cleanups++;
3311                                         }
3312                                         markNAND = 0;
3313                                 } else if (0) {
3314                                         /* Todo object && object->deleted && object->nDataChunks == 0 */
3315                                         /* Deleted object header with no data chunks.
3316                                          * Can be discarded and the file deleted.
3317                                          */
3318                                         object->hdrChunk = 0;
3319                                         yaffs_FreeTnode(object->myDev,
3320                                                         object->variant.
3321                                                         fileVariant.top);
3322                                         object->variant.fileVariant.top = NULL;
3323                                         yaffs_DoGenericObjectDeletion(object);
3324
3325                                 } else if (object) {
3326                                         /* It's either a data chunk in a live file or
3327                                          * an ObjectHeader, so we're interested in it.
3328                                          * NB Need to keep the ObjectHeaders of deleted files
3329                                          * until the whole file has been deleted off
3330                                          */
3331                                         tags.serialNumber++;
3332
3333                                         dev->nGCCopies++;
3334
3335                                         if (tags.chunkId == 0) {
3336                                                 /* It is an object Id,
3337                                                  * We need to nuke the shrinkheader flags first
3338                                                  * Also need to clean up shadowing.
3339                                                  * We no longer want the shrinkHeader flag since its work is done
3340                                                  * and if it is left in place it will mess up scanning.
3341                                                  */
3342
3343                                                 yaffs_ObjectHeader *oh;
3344                                                 oh = (yaffs_ObjectHeader *)buffer;
3345
3346                                                 oh->isShrink = 0;
3347                                                 tags.extraIsShrinkHeader = 0;
3348
3349                                                 oh->shadowsObject = 0;
3350                                                 oh->inbandShadowsObject = 0;
3351                                                 tags.extraShadows = 0;
3352
3353                                                 /* Update file size */
3354                                                 if(object->variantType == YAFFS_OBJECT_TYPE_FILE){
3355                                                         oh->fileSize = object->variant.fileVariant.fileSize;
3356                                                         tags.extraFileLength = oh->fileSize;
3357                                                 }
3358
3359                                                 yaffs_VerifyObjectHeader(object, oh, &tags, 1);
3360                                                 newChunk =
3361                                                     yaffs_WriteNewChunkWithTagsToNAND(dev,(__u8 *) oh, &tags, 1);
3362                                         } else
3363                                                 newChunk =
3364                                                     yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3365
3366                                         if (newChunk < 0) {
3367                                                 retVal = YAFFS_FAIL;
3368                                         } else {
3369
3370                                                 /* Ok, now fix up the Tnodes etc. */
3371
3372                                                 if (tags.chunkId == 0) {
3373                                                         /* It's a header */
3374                                                         object->hdrChunk =  newChunk;
3375                                                         object->serial =   tags.serialNumber;
3376                                                 } else {
3377                                                         /* It's a data chunk */
3378                                                         int ok;
3379                                                         ok = yaffs_PutChunkIntoFile
3380                                                             (object,
3381                                                              tags.chunkId,
3382                                                              newChunk, 0);
3383                                                 }
3384                                         }
3385                                 }
3386
3387                                 if (retVal == YAFFS_OK)
3388                                         yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3389
3390                         }
3391                 }
3392
3393                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3394
3395
3396                 /* Do any required cleanups */
3397                 for (i = 0; i < cleanups; i++) {
3398                         /* Time to delete the file too */
3399                         object =
3400                             yaffs_FindObjectByNumber(dev,
3401                                                      dev->gcCleanupList[i]);
3402                         if (object) {
3403                                 yaffs_FreeTnode(dev,
3404                                                 object->variant.fileVariant.
3405                                                 top);
3406                                 object->variant.fileVariant.top = NULL;
3407                                 T(YAFFS_TRACE_GC,
3408                                   (TSTR
3409                                    ("yaffs: About to finally delete object %d"
3410                                     TENDSTR), object->objectId));
3411                                 yaffs_DoGenericObjectDeletion(object);
3412                                 object->myDev->nDeletedFiles--;
3413                         }
3414
3415                 }
3416
3417         }
3418
3419         yaffs_VerifyCollectedBlock(dev, bi, block);
3420
3421
3422
3423         /* If the gc completed then clear the current gcBlock so that we find another. */
3424         if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
3425                 chunksAfter = yaffs_GetErasedChunks(dev);
3426                 if (chunksBefore >= chunksAfter) {
3427                         T(YAFFS_TRACE_GC,
3428                           (TSTR
3429                            ("gc did not increase free chunks before %d after %d"
3430                             TENDSTR), chunksBefore, chunksAfter));
3431                 }
3432                 dev->gcBlock = -1;
3433                 dev->gcChunk = 0;
3434         }
3435
3436         dev->isDoingGC = 0;
3437
3438         return retVal;
3439 }
3440
3441 /* New garbage collector
3442  * If we're very low on erased blocks then we do aggressive garbage collection
3443  * otherwise we do "leasurely" garbage collection.
3444  * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3445  * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3446  *
3447  * The idea is to help clear out space in a more spread-out manner.
3448  * Dunno if it really does anything useful.
3449  */
3450 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
3451 {
3452         int block;
3453         int aggressive;
3454         int gcOk = YAFFS_OK;
3455         int maxTries = 0;
3456
3457         int checkpointBlockAdjust;
3458
3459         if (dev->isDoingGC) {
3460                 /* Bail out so we don't get recursive gc */
3461                 return YAFFS_OK;
3462         }
3463
3464         /* This loop should pass the first time.
3465          * We'll only see looping here if the erase of the collected block fails.
3466          */
3467
3468         do {
3469                 maxTries++;
3470
3471                 checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
3472                 if (checkpointBlockAdjust < 0)
3473                         checkpointBlockAdjust = 0;
3474
3475                 /* If we need a block soon then do aggressive gc.*/
3476                 if (dev->nErasedBlocks < (dev->param.nReservedBlocks + checkpointBlockAdjust + 2))
3477                         aggressive = 1;
3478                 else
3479                         aggressive = 0;
3480
3481                 /* If we don't already have a block being gc'd then see if we should start another */
3482
3483                 if (dev->gcBlock < 1 && !aggressive) {
3484                         dev->gcBlock = yaffs_FindRefreshBlock(dev);
3485                         dev->gcChunk = 0;
3486                 }
3487                 if (dev->gcBlock < 1) {
3488                         dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3489                         dev->gcChunk = 0;
3490                 }
3491
3492                 block = dev->gcBlock;
3493
3494                 if (block > 0) {
3495                         dev->garbageCollections++;
3496                         if (!aggressive)
3497                                 dev->passiveGarbageCollections++;
3498
3499                         T(YAFFS_TRACE_GC,
3500                           (TSTR
3501                            ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3502                            dev->nErasedBlocks, aggressive));
3503
3504                         gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
3505                 }
3506
3507                 if (dev->nErasedBlocks < (dev->param.nReservedBlocks) && block > 0) {
3508                         T(YAFFS_TRACE_GC,
3509                           (TSTR
3510                            ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3511                             TENDSTR), dev->nErasedBlocks, maxTries, block));
3512                 }
3513         } while ((dev->nErasedBlocks < dev->param.nReservedBlocks) &&
3514                  (block > 0) &&
3515                  (maxTries < 2));
3516
3517         return aggressive ? gcOk : YAFFS_OK;
3518 }
3519
3520 /*-------------------------  TAGS --------------------------------*/
3521
3522 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
3523                            int chunkInObject)
3524 {
3525         return (tags->chunkId == chunkInObject &&
3526                 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3527
3528 }
3529
3530
3531 /*-------------------- Data file manipulation -----------------*/
3532
3533 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
3534                                  yaffs_ExtendedTags *tags)
3535 {
3536         /*Get the Tnode, then get the level 0 offset chunk offset */
3537         yaffs_Tnode *tn;
3538         int theChunk = -1;
3539         yaffs_ExtendedTags localTags;
3540         int retVal = -1;
3541
3542         yaffs_Device *dev = in->myDev;
3543
3544         if (!tags) {
3545                 /* Passed a NULL, so use our own tags space */
3546                 tags = &localTags;
3547         }
3548
3549         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3550
3551         if (tn) {
3552                 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3553
3554                 retVal =
3555                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3556                                            chunkInInode);
3557         }
3558         return retVal;
3559 }
3560
3561 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
3562                                           yaffs_ExtendedTags *tags)
3563 {
3564         /* Get the Tnode, then get the level 0 offset chunk offset */
3565         yaffs_Tnode *tn;
3566         int theChunk = -1;
3567         yaffs_ExtendedTags localTags;
3568
3569         yaffs_Device *dev = in->myDev;
3570         int retVal = -1;
3571
3572         if (!tags) {
3573                 /* Passed a NULL, so use our own tags space */
3574                 tags = &localTags;
3575         }
3576
3577         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3578
3579         if (tn) {
3580
3581                 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3582
3583                 retVal =
3584                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3585                                            chunkInInode);
3586
3587                 /* Delete the entry in the filestructure (if found) */
3588                 if (retVal != -1)
3589                         yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0);
3590         }
3591
3592         return retVal;
3593 }
3594
3595 #ifdef YAFFS_PARANOID
3596
3597 static int yaffs_CheckFileSanity(yaffs_Object *in)
3598 {
3599         int chunk;
3600         int nChunks;
3601         int fSize;
3602         int failed = 0;
3603         int objId;
3604         yaffs_Tnode *tn;
3605         yaffs_Tags localTags;
3606         yaffs_Tags *tags = &localTags;
3607         int theChunk;
3608         int chunkDeleted;
3609
3610         if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
3611                 return YAFFS_FAIL;
3612
3613         objId = in->objectId;
3614         fSize = in->variant.fileVariant.fileSize;
3615         nChunks =
3616             (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3617
3618         for (chunk = 1; chunk <= nChunks; chunk++) {
3619                 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3620                                            chunk);
3621
3622                 if (tn) {
3623
3624                         theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
3625
3626                         if (yaffs_CheckChunkBits
3627                             (dev, theChunk / dev->param.nChunksPerBlock,
3628                              theChunk % dev->param.nChunksPerBlock)) {
3629
3630                                 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3631                                                             tags,
3632                                                             &chunkDeleted);
3633                                 if (yaffs_TagsMatch
3634                                     (tags, in->objectId, chunk, chunkDeleted)) {
3635                                         /* found it; */
3636
3637                                 }
3638                         } else {
3639
3640                                 failed = 1;
3641                         }
3642
3643                 } else {
3644                         /* T(("No level 0 found for %d\n", chunk)); */
3645                 }
3646         }
3647
3648         return failed ? YAFFS_FAIL : YAFFS_OK;
3649 }
3650
3651 #endif
3652
3653 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
3654                                   int chunkInNAND, int inScan)
3655 {
3656         /* NB inScan is zero unless scanning.
3657          * For forward scanning, inScan is > 0;
3658          * for backward scanning inScan is < 0
3659          *
3660          * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there.
3661          */
3662
3663         yaffs_Tnode *tn;
3664         yaffs_Device *dev = in->myDev;
3665         int existingChunk;
3666         yaffs_ExtendedTags existingTags;
3667         yaffs_ExtendedTags newTags;
3668         unsigned existingSerial, newSerial;
3669
3670         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3671                 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3672                  * If it is not during Scanning then something went wrong!
3673                  */
3674                 if (!inScan) {
3675                         T(YAFFS_TRACE_ERROR,
3676                           (TSTR
3677                            ("yaffs tragedy:attempt to put data chunk into a non-file"
3678                             TENDSTR)));
3679                         YBUG();
3680                 }
3681
3682                 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3683                 return YAFFS_OK;
3684         }
3685
3686         tn = yaffs_AddOrFindLevel0Tnode(dev,
3687                                         &in->variant.fileVariant,
3688                                         chunkInInode,
3689                                         NULL);
3690         if (!tn)
3691                 return YAFFS_FAIL;
3692
3693         if(!chunkInNAND)
3694                 /* Dummy insert, bail now */
3695                 return YAFFS_OK;
3696
3697         existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3698
3699         if (inScan != 0) {
3700                 /* If we're scanning then we need to test for duplicates
3701                  * NB This does not need to be efficient since it should only ever
3702                  * happen when the power fails during a write, then only one
3703                  * chunk should ever be affected.
3704                  *
3705                  * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3706                  * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3707                  */
3708
3709                 if (existingChunk > 0) {
3710                         /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3711                          *    thus we have to do a FindChunkInFile to get the real chunk id.
3712                          *
3713                          * We have a duplicate now we need to decide which one to use:
3714                          *
3715                          * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3716                          * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3717                          * YAFFS1: Get both sets of tags and compare serial numbers.
3718                          */
3719
3720                         if (inScan > 0) {
3721                                 /* Only do this for forward scanning */
3722                                 yaffs_ReadChunkWithTagsFromNAND(dev,
3723                                                                 chunkInNAND,
3724                                                                 NULL, &newTags);
3725
3726                                 /* Do a proper find */
3727                                 existingChunk =
3728                                     yaffs_FindChunkInFile(in, chunkInInode,
3729                                                           &existingTags);
3730                         }
3731
3732                         if (existingChunk <= 0) {
3733                                 /*Hoosterman - how did this happen? */
3734
3735                                 T(YAFFS_TRACE_ERROR,
3736                                   (TSTR
3737                                    ("yaffs tragedy: existing chunk < 0 in scan"
3738                                     TENDSTR)));
3739
3740                         }
3741
3742                         /* NB The deleted flags should be false, otherwise the chunks will
3743                          * not be loaded during a scan
3744                          */
3745
3746                         if (inScan > 0) {
3747                                 newSerial = newTags.serialNumber;
3748                                 existingSerial = existingTags.serialNumber;
3749                         }
3750
3751                         if ((inScan > 0) &&
3752                             (in->myDev->param.isYaffs2 ||
3753                              existingChunk <= 0 ||
3754                              ((existingSerial + 1) & 3) == newSerial)) {
3755                                 /* Forward scanning.
3756                                  * Use new
3757                                  * Delete the old one and drop through to update the tnode
3758                                  */
3759                                 yaffs_DeleteChunk(dev, existingChunk, 1,
3760                                                   __LINE__);
3761                         } else {
3762                                 /* Backward scanning or we want to use the existing one
3763                                  * Use existing.
3764                                  * Delete the new one and return early so that the tnode isn't changed
3765                                  */
3766                                 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3767                                                   __LINE__);
3768                                 return YAFFS_OK;
3769                         }
3770                 }
3771
3772         }
3773
3774         if (existingChunk == 0)
3775                 in->nDataChunks++;
3776
3777         yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
3778
3779         return YAFFS_OK;
3780 }
3781
3782 static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
3783                                         __u8 *buffer)
3784 {
3785         int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3786
3787         if (chunkInNAND >= 0)
3788                 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3789                                                 buffer, NULL);
3790         else {
3791                 T(YAFFS_TRACE_NANDACCESS,
3792                   (TSTR("Chunk %d not found zero instead" TENDSTR),
3793                    chunkInNAND));
3794                 /* get sane (zero) data if you read a hole */
3795                 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3796                 return 0;
3797         }
3798
3799 }
3800
3801 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
3802 {
3803         int block;
3804         int page;
3805         yaffs_ExtendedTags tags;
3806         yaffs_BlockInfo *bi;
3807
3808         if (chunkId <= 0)
3809                 return;
3810
3811         dev->nDeletions++;
3812         block = chunkId / dev->param.nChunksPerBlock;
3813         page = chunkId % dev->param.nChunksPerBlock;
3814
3815
3816         if (!yaffs_CheckChunkBit(dev, block, page))
3817                 T(YAFFS_TRACE_VERIFY,
3818                         (TSTR("Deleting invalid chunk %d"TENDSTR),
3819                          chunkId));
3820
3821         bi = yaffs_GetBlockInfo(dev, block);
3822
3823         yaffs_UpdateOldestDirtySequence(dev,bi);
3824
3825         T(YAFFS_TRACE_DELETION,
3826           (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3827
3828         if (markNAND &&
3829             bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->param.isYaffs2) {
3830
3831                 yaffs_InitialiseTags(&tags);
3832
3833                 tags.chunkDeleted = 1;
3834
3835                 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3836                 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3837         } else {
3838                 dev->nUnmarkedDeletions++;
3839         }
3840
3841         /* Pull out of the management area.
3842          * If the whole block became dirty, this will kick off an erasure.
3843          */
3844         if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3845             bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3846             bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3847             bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3848                 dev->nFreeChunks++;
3849
3850                 yaffs_ClearChunkBit(dev, block, page);
3851
3852                 bi->pagesInUse--;
3853
3854                 if (bi->pagesInUse == 0 &&
3855                     !bi->hasShrinkHeader &&
3856                     bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3857                     bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3858                         yaffs_BlockBecameDirty(dev, block);
3859                 }
3860
3861         }
3862
3863 }
3864
3865 static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
3866                                         const __u8 *buffer, int nBytes,
3867                                         int useReserve)
3868 {
3869         /* Find old chunk Need to do this to get serial number
3870          * Write new one and patch into tree.
3871          * Invalidate old tags.
3872          */
3873
3874         int prevChunkId;
3875         yaffs_ExtendedTags prevTags;
3876
3877         int newChunkId;
3878         yaffs_ExtendedTags newTags;
3879
3880         yaffs_Device *dev = in->myDev;
3881
3882         yaffs_CheckGarbageCollection(dev);
3883
3884         /* Get the previous chunk at this location in the file if it exists.
3885          * If it does not exist then put a zero into the tree. This creates
3886          * the tnode now, rather than later when it is harder to clean up.
3887          */
3888         prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3889         if(prevChunkId < 1 &&
3890                 !yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0))
3891                 return 0;
3892
3893         /* Set up new tags */
3894         yaffs_InitialiseTags(&newTags);
3895
3896         newTags.chunkId = chunkInInode;
3897         newTags.objectId = in->objectId;
3898         newTags.serialNumber =
3899             (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
3900         newTags.byteCount = nBytes;
3901
3902         if (nBytes < 1 || nBytes > dev->param.totalBytesPerChunk) {
3903                 T(YAFFS_TRACE_ERROR,
3904                 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
3905                 YBUG();
3906         }
3907
3908
3909         newChunkId =
3910             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3911                                               useReserve);
3912
3913         if (newChunkId > 0) {
3914                 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3915
3916                 if (prevChunkId > 0)
3917                         yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3918
3919                 yaffs_CheckFileSanity(in);
3920         }
3921         return newChunkId;
3922
3923 }
3924
3925 /* UpdateObjectHeader updates the header on NAND for an object.
3926  * If name is not NULL, then that new name is used.
3927  */
3928 int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
3929                              int isShrink, int shadows)
3930 {
3931
3932         yaffs_BlockInfo *bi;
3933
3934         yaffs_Device *dev = in->myDev;
3935
3936         int prevChunkId;
3937         int retVal = 0;
3938         int result = 0;
3939
3940         int newChunkId;
3941         yaffs_ExtendedTags newTags;
3942         yaffs_ExtendedTags oldTags;
3943         YCHAR *alias = NULL;
3944
3945         __u8 *buffer = NULL;
3946         YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3947
3948         yaffs_ObjectHeader *oh = NULL;
3949
3950         yaffs_strcpy(oldName, _Y("silly old name"));
3951
3952
3953         if (!in->fake ||
3954                 in == dev->rootDir || /* The rootDir should also be saved */
3955                 force) {
3956
3957                 yaffs_CheckGarbageCollection(dev);
3958                 yaffs_CheckObjectDetailsLoaded(in);
3959
3960                 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3961                 oh = (yaffs_ObjectHeader *) buffer;
3962
3963                 prevChunkId = in->hdrChunk;
3964
3965                 if (prevChunkId > 0) {
3966                         result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3967                                                         buffer, &oldTags);
3968
3969                         yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
3970
3971                         memcpy(oldName, oh->name, sizeof(oh->name));
3972                 }
3973
3974                 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3975
3976                 oh->type = in->variantType;
3977                 oh->yst_mode = in->yst_mode;
3978                 oh->shadowsObject = oh->inbandShadowsObject = shadows;
3979
3980 #ifdef CONFIG_YAFFS_WINCE
3981                 oh->win_atime[0] = in->win_atime[0];
3982                 oh->win_ctime[0] = in->win_ctime[0];
3983                 oh->win_mtime[0] = in->win_mtime[0];
3984                 oh->win_atime[1] = in->win_atime[1];
3985                 oh->win_ctime[1] = in->win_ctime[1];
3986                 oh->win_mtime[1] = in->win_mtime[1];
3987 #else
3988                 oh->yst_uid = in->yst_uid;
3989                 oh->yst_gid = in->yst_gid;
3990                 oh->yst_atime = in->yst_atime;
3991                 oh->yst_mtime = in->yst_mtime;
3992                 oh->yst_ctime = in->yst_ctime;
3993                 oh->yst_rdev = in->yst_rdev;
3994 #endif
3995                 if (in->parent)
3996                         oh->parentObjectId = in->parent->objectId;
3997                 else
3998                         oh->parentObjectId = 0;
3999
4000                 if (name && *name) {
4001                         memset(oh->name, 0, sizeof(oh->name));
4002                         yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
4003                 } else if (prevChunkId > 0)
4004                         memcpy(oh->name, oldName, sizeof(oh->name));
4005                 else
4006                         memset(oh->name, 0, sizeof(oh->name));
4007
4008                 oh->isShrink = isShrink;
4009
4010                 switch (in->variantType) {
4011                 case YAFFS_OBJECT_TYPE_UNKNOWN:
4012                         /* Should not happen */
4013                         break;
4014                 case YAFFS_OBJECT_TYPE_FILE:
4015                         oh->fileSize =
4016                             (oh->parentObjectId == YAFFS_OBJECTID_DELETED
4017                              || oh->parentObjectId ==
4018                              YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
4019                             fileVariant.fileSize;
4020                         break;
4021                 case YAFFS_OBJECT_TYPE_HARDLINK:
4022                         oh->equivalentObjectId =
4023                             in->variant.hardLinkVariant.equivalentObjectId;
4024                         break;
4025                 case YAFFS_OBJECT_TYPE_SPECIAL:
4026                         /* Do nothing */
4027                         break;
4028                 case YAFFS_OBJECT_TYPE_DIRECTORY:
4029                         /* Do nothing */
4030                         break;
4031                 case YAFFS_OBJECT_TYPE_SYMLINK:
4032                         alias = in->variant.symLinkVariant.alias;
4033                         if(!alias)
4034                                 alias = _Y("no alias");
4035                         yaffs_strncpy(oh->alias,
4036                                         alias,
4037                                       YAFFS_MAX_ALIAS_LENGTH);
4038                         oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
4039                         break;
4040                 }
4041
4042                 /* Tags */
4043                 yaffs_InitialiseTags(&newTags);
4044                 in->serial++;
4045                 newTags.chunkId = 0;
4046                 newTags.objectId = in->objectId;
4047                 newTags.serialNumber = in->serial;
4048
4049                 /* Add extra info for file header */
4050
4051                 newTags.extraHeaderInfoAvailable = 1;
4052                 newTags.extraParentObjectId = oh->parentObjectId;
4053                 newTags.extraFileLength = oh->fileSize;
4054                 newTags.extraIsShrinkHeader = oh->isShrink;
4055                 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
4056                 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
4057                 newTags.extraObjectType = in->variantType;
4058
4059                 yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
4060
4061                 /* Create new chunk in NAND */
4062                 newChunkId =
4063                     yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
4064                                                       (prevChunkId > 0) ? 1 : 0);
4065
4066                 if (newChunkId >= 0) {
4067
4068                         in->hdrChunk = newChunkId;
4069
4070                         if (prevChunkId > 0) {
4071                                 yaffs_DeleteChunk(dev, prevChunkId, 1,
4072                                                   __LINE__);
4073                         }
4074
4075                         if (!yaffs_ObjectHasCachedWriteData(in))
4076                                 in->dirty = 0;
4077
4078                         /* If this was a shrink, then mark the block that the chunk lives on */
4079                         if (isShrink) {
4080                                 bi = yaffs_GetBlockInfo(in->myDev,
4081                                         newChunkId / in->myDev->param.nChunksPerBlock);
4082                                 bi->hasShrinkHeader = 1;
4083                         }
4084
4085                 }
4086
4087                 retVal = newChunkId;
4088
4089         }
4090
4091         if (buffer)
4092                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
4093
4094         return retVal;
4095 }
4096
4097 /*------------------------ Short Operations Cache ----------------------------------------
4098  *   In many situations where there is no high level buffering (eg WinCE) a lot of
4099  *   reads might be short sequential reads, and a lot of writes may be short
4100  *   sequential writes. eg. scanning/writing a jpeg file.
4101  *   In these cases, a short read/write cache can provide a huge perfomance benefit
4102  *   with dumb-as-a-rock code.
4103  *   In Linux, the page cache provides read buffering aand the short op cache provides write
4104  *   buffering.
4105  *
4106  *   There are a limited number (~10) of cache chunks per device so that we don't
4107  *   need a very intelligent search.
4108  */
4109
4110 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
4111 {
4112         yaffs_Device *dev = obj->myDev;
4113         int i;
4114         yaffs_ChunkCache *cache;
4115         int nCaches = obj->myDev->param.nShortOpCaches;
4116
4117         for (i = 0; i < nCaches; i++) {
4118                 cache = &dev->srCache[i];
4119                 if (cache->object == obj &&
4120                     cache->dirty)
4121                         return 1;
4122         }
4123
4124         return 0;
4125 }
4126
4127
4128 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
4129 {
4130         yaffs_Device *dev = obj->myDev;
4131         int lowest = -99;       /* Stop compiler whining. */
4132         int i;
4133         yaffs_ChunkCache *cache;
4134         int chunkWritten = 0;
4135         int nCaches = obj->myDev->param.nShortOpCaches;
4136
4137         if (nCaches > 0) {
4138                 do {
4139                         cache = NULL;
4140
4141                         /* Find the dirty cache for this object with the lowest chunk id. */
4142                         for (i = 0; i < nCaches; i++) {
4143                                 if (dev->srCache[i].object == obj &&
4144                                     dev->srCache[i].dirty) {
4145                                         if (!cache
4146                                             || dev->srCache[i].chunkId <
4147                                             lowest) {
4148                                                 cache = &dev->srCache[i];
4149                                                 lowest = cache->chunkId;
4150                                         }
4151                                 }
4152                         }
4153
4154                         if (cache && !cache->locked) {
4155                                 /* Write it out and free it up */
4156
4157                                 chunkWritten =
4158                                     yaffs_WriteChunkDataToObject(cache->object,
4159                                                                  cache->chunkId,
4160                                                                  cache->data,
4161                                                                  cache->nBytes,
4162                                                                  1);
4163                                 cache->dirty = 0;
4164                                 cache->object = NULL;
4165                         }
4166
4167                 } while (cache && chunkWritten > 0);
4168
4169                 if (cache) {
4170                         /* Hoosterman, disk full while writing cache out. */
4171                         T(YAFFS_TRACE_ERROR,
4172                           (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
4173
4174                 }
4175         }
4176
4177 }
4178
4179 /*yaffs_FlushEntireDeviceCache(dev)
4180  *
4181  *
4182  */
4183
4184 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
4185 {
4186         yaffs_Object *obj;
4187         int nCaches = dev->param.nShortOpCaches;
4188         int i;
4189
4190         /* Find a dirty object in the cache and flush it...
4191          * until there are no further dirty objects.
4192          */
4193         do {
4194                 obj = NULL;
4195                 for (i = 0; i < nCaches && !obj; i++) {
4196                         if (dev->srCache[i].object &&
4197                             dev->srCache[i].dirty)
4198                                 obj = dev->srCache[i].object;
4199
4200                 }
4201                 if (obj)
4202                         yaffs_FlushFilesChunkCache(obj);
4203
4204         } while (obj);
4205
4206 }
4207
4208
4209 /* Grab us a cache chunk for use.
4210  * First look for an empty one.
4211  * Then look for the least recently used non-dirty one.
4212  * Then look for the least recently used dirty one...., flush and look again.
4213  */
4214 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
4215 {
4216         int i;
4217
4218         if (dev->param.nShortOpCaches > 0) {
4219                 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4220                         if (!dev->srCache[i].object)
4221                                 return &dev->srCache[i];
4222                 }
4223         }
4224
4225         return NULL;
4226 }
4227
4228 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
4229 {
4230         yaffs_ChunkCache *cache;
4231         yaffs_Object *theObj;
4232         int usage;
4233         int i;
4234         int pushout;
4235
4236         if (dev->param.nShortOpCaches > 0) {
4237                 /* Try find a non-dirty one... */
4238
4239                 cache = yaffs_GrabChunkCacheWorker(dev);
4240
4241                 if (!cache) {
4242                         /* They were all dirty, find the last recently used object and flush
4243                          * its cache, then  find again.
4244                          * NB what's here is not very accurate, we actually flush the object
4245                          * the last recently used page.
4246                          */
4247
4248                         /* With locking we can't assume we can use entry zero */
4249
4250                         theObj = NULL;
4251                         usage = -1;
4252                         cache = NULL;
4253                         pushout = -1;
4254
4255                         for (i = 0; i < dev->param.nShortOpCaches; i++) {
4256                                 if (dev->srCache[i].object &&
4257                                     !dev->srCache[i].locked &&
4258                                     (dev->srCache[i].lastUse < usage || !cache)) {
4259                                         usage = dev->srCache[i].lastUse;
4260                                         theObj = dev->srCache[i].object;
4261                                         cache = &dev->srCache[i];
4262                                         pushout = i;
4263                                 }
4264                         }
4265
4266                         if (!cache || cache->dirty) {
4267                                 /* Flush and try again */
4268                                 yaffs_FlushFilesChunkCache(theObj);
4269                                 cache = yaffs_GrabChunkCacheWorker(dev);
4270                         }
4271
4272                 }
4273                 return cache;
4274         } else
4275                 return NULL;
4276
4277 }
4278
4279 /* Find a cached chunk */
4280 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
4281                                               int chunkId)
4282 {
4283         yaffs_Device *dev = obj->myDev;
4284         int i;
4285         if (dev->param.nShortOpCaches > 0) {
4286                 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4287                         if (dev->srCache[i].object == obj &&
4288                             dev->srCache[i].chunkId == chunkId) {
4289                                 dev->cacheHits++;
4290
4291                                 return &dev->srCache[i];
4292                         }
4293                 }
4294         }
4295         return NULL;
4296 }
4297
4298 /* Mark the chunk for the least recently used algorithym */
4299 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
4300                                 int isAWrite)
4301 {
4302
4303         if (dev->param.nShortOpCaches > 0) {
4304                 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
4305                         /* Reset the cache usages */
4306                         int i;
4307                         for (i = 1; i < dev->param.nShortOpCaches; i++)
4308                                 dev->srCache[i].lastUse = 0;
4309
4310                         dev->srLastUse = 0;
4311                 }
4312
4313                 dev->srLastUse++;
4314
4315                 cache->lastUse = dev->srLastUse;
4316
4317                 if (isAWrite)
4318                         cache->dirty = 1;
4319         }
4320 }
4321
4322 /* Invalidate a single cache page.
4323  * Do this when a whole page gets written,
4324  * ie the short cache for this page is no longer valid.
4325  */
4326 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
4327 {
4328         if (object->myDev->param.nShortOpCaches > 0) {
4329                 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4330
4331                 if (cache)
4332                         cache->object = NULL;
4333         }
4334 }
4335
4336 /* Invalidate all the cache pages associated with this object
4337  * Do this whenever ther file is deleted or resized.
4338  */
4339 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
4340 {
4341         int i;
4342         yaffs_Device *dev = in->myDev;
4343
4344         if (dev->param.nShortOpCaches > 0) {
4345                 /* Invalidate it. */
4346                 for (i = 0; i < dev->param.nShortOpCaches; i++) {
4347                         if (dev->srCache[i].object == in)
4348                                 dev->srCache[i].object = NULL;
4349                 }
4350         }
4351 }
4352
4353 /*--------------------- Checkpointing --------------------*/
4354
4355
4356 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
4357 {
4358         yaffs_CheckpointValidity cp;
4359
4360         memset(&cp, 0, sizeof(cp));
4361
4362         cp.structType = sizeof(cp);
4363         cp.magic = YAFFS_MAGIC;
4364         cp.version = YAFFS_CHECKPOINT_VERSION;
4365         cp.head = (head) ? 1 : 0;
4366
4367         return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
4368                 1 : 0;
4369 }
4370
4371 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4372 {
4373         yaffs_CheckpointValidity cp;
4374         int ok;
4375
4376         ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4377
4378         if (ok)
4379                 ok = (cp.structType == sizeof(cp)) &&
4380                      (cp.magic == YAFFS_MAGIC) &&
4381                      (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4382                      (cp.head == ((head) ? 1 : 0));
4383         return ok ? 1 : 0;
4384 }
4385
4386 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4387                                            yaffs_Device *dev)
4388 {
4389         cp->nErasedBlocks = dev->nErasedBlocks;
4390         cp->allocationBlock = dev->allocationBlock;
4391         cp->allocationPage = dev->allocationPage;
4392         cp->nFreeChunks = dev->nFreeChunks;
4393
4394         cp->nDeletedFiles = dev->nDeletedFiles;
4395         cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4396         cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4397         cp->sequenceNumber = dev->sequenceNumber;
4398
4399 }
4400
4401 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4402                                            yaffs_CheckpointDevice *cp)
4403 {
4404         dev->nErasedBlocks = cp->nErasedBlocks;
4405         dev->allocationBlock = cp->allocationBlock;
4406         dev->allocationPage = cp->allocationPage;
4407         dev->nFreeChunks = cp->nFreeChunks;
4408
4409         dev->nDeletedFiles = cp->nDeletedFiles;
4410         dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4411         dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4412         dev->sequenceNumber = cp->sequenceNumber;
4413 }
4414
4415
4416 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4417 {
4418         yaffs_CheckpointDevice cp;
4419         __u32 nBytes;
4420         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4421
4422         int ok;
4423
4424         /* Write device runtime values*/
4425         yaffs_DeviceToCheckpointDevice(&cp, dev);
4426         cp.structType = sizeof(cp);
4427
4428         ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4429
4430         /* Write block info */
4431         if (ok) {
4432                 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4433                 ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
4434         }
4435
4436         /* Write chunk bits */
4437         if (ok) {
4438                 nBytes = nBlocks * dev->chunkBitmapStride;
4439                 ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
4440         }
4441         return   ok ? 1 : 0;
4442
4443 }
4444
4445 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4446 {
4447         yaffs_CheckpointDevice cp;
4448         __u32 nBytes;
4449         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4450
4451         int ok;
4452
4453         ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4454         if (!ok)
4455                 return 0;
4456
4457         if (cp.structType != sizeof(cp))
4458                 return 0;
4459
4460
4461         yaffs_CheckpointDeviceToDevice(dev, &cp);
4462
4463         nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4464
4465         ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
4466
4467         if (!ok)
4468                 return 0;
4469         nBytes = nBlocks * dev->chunkBitmapStride;
4470
4471         ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
4472
4473         return ok ? 1 : 0;
4474 }
4475
4476 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4477                                            yaffs_Object *obj)
4478 {
4479
4480         cp->objectId = obj->objectId;
4481         cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4482         cp->hdrChunk = obj->hdrChunk;
4483         cp->variantType = obj->variantType;
4484         cp->deleted = obj->deleted;
4485         cp->softDeleted = obj->softDeleted;
4486         cp->unlinked = obj->unlinked;
4487         cp->fake = obj->fake;
4488         cp->renameAllowed = obj->renameAllowed;
4489         cp->unlinkAllowed = obj->unlinkAllowed;
4490         cp->serial = obj->serial;
4491         cp->nDataChunks = obj->nDataChunks;
4492
4493         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4494                 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4495         else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4496                 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4497 }
4498
4499 static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
4500 {
4501
4502         yaffs_Object *parent;
4503
4504         if (obj->variantType != cp->variantType) {
4505                 T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
4506                         TCONT("chunk %d does not match existing object type %d")
4507                         TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
4508                         obj->variantType));
4509                 return 0;
4510         }
4511
4512         obj->objectId = cp->objectId;
4513
4514         if (cp->parentId)
4515                 parent = yaffs_FindOrCreateObjectByNumber(
4516                                         obj->myDev,
4517                                         cp->parentId,
4518                                         YAFFS_OBJECT_TYPE_DIRECTORY);
4519         else
4520                 parent = NULL;
4521
4522         if (parent) {
4523                 if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4524                         T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
4525                                 TCONT(" chunk %d Parent type, %d, not directory")
4526                                 TENDSTR),
4527                                 cp->objectId, cp->parentId, cp->variantType,
4528                                 cp->hdrChunk, parent->variantType));
4529                         return 0;
4530                 }
4531                 yaffs_AddObjectToDirectory(parent, obj);
4532         }
4533
4534         obj->hdrChunk = cp->hdrChunk;
4535         obj->variantType = cp->variantType;
4536         obj->deleted = cp->deleted;
4537         obj->softDeleted = cp->softDeleted;
4538         obj->unlinked = cp->unlinked;
4539         obj->fake = cp->fake;
4540         obj->renameAllowed = cp->renameAllowed;
4541         obj->unlinkAllowed = cp->unlinkAllowed;
4542         obj->serial = cp->serial;
4543         obj->nDataChunks = cp->nDataChunks;
4544
4545         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4546                 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4547         else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4548                 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4549
4550         if (obj->hdrChunk > 0)
4551                 obj->lazyLoaded = 1;
4552         return 1;
4553 }
4554
4555
4556
4557 static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
4558                                         __u32 level, int chunkOffset)
4559 {
4560         int i;
4561         yaffs_Device *dev = in->myDev;
4562         int ok = 1;
4563         int tnodeSize = yaffs_CalcTnodeSize(dev);
4564
4565         if (tn) {
4566                 if (level > 0) {
4567
4568                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
4569                                 if (tn->internal[i]) {
4570                                         ok = yaffs_CheckpointTnodeWorker(in,
4571                                                         tn->internal[i],
4572                                                         level - 1,
4573                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4574                                 }
4575                         }
4576                 } else if (level == 0) {
4577                         __u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
4578                         ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
4579                         if (ok)
4580                                 ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
4581                 }
4582         }
4583
4584         return ok;
4585
4586 }
4587
4588 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4589 {
4590         __u32 endMarker = ~0;
4591         int ok = 1;
4592
4593         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4594                 ok = yaffs_CheckpointTnodeWorker(obj,
4595                                             obj->variant.fileVariant.top,
4596                                             obj->variant.fileVariant.topLevel,
4597                                             0);
4598                 if (ok)
4599                         ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
4600                                 sizeof(endMarker));
4601         }
4602
4603         return ok ? 1 : 0;
4604 }
4605
4606 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4607 {
4608         __u32 baseChunk;
4609         int ok = 1;
4610         yaffs_Device *dev = obj->myDev;
4611         yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4612         yaffs_Tnode *tn;
4613         int nread = 0;
4614         int tnodeSize = yaffs_CalcTnodeSize(dev);
4615
4616         ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4617
4618         while (ok && (~baseChunk)) {
4619                 nread++;
4620                 /* Read level 0 tnode */
4621
4622
4623                 tn = yaffs_GetTnodeRaw(dev);
4624                 if (tn)
4625                         ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
4626                 else
4627                         ok = 0;
4628
4629                 if (tn && ok)
4630                         ok = yaffs_AddOrFindLevel0Tnode(dev,
4631                                                         fileStructPtr,
4632                                                         baseChunk,
4633                                                         tn) ? 1 : 0;
4634
4635                 if (ok)
4636                         ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4637
4638         }
4639
4640         T(YAFFS_TRACE_CHECKPOINT, (
4641                 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4642                 nread, baseChunk, ok));
4643
4644         return ok ? 1 : 0;
4645 }
4646
4647
4648 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4649 {
4650         yaffs_Object *obj;
4651         yaffs_CheckpointObject cp;
4652         int i;
4653         int ok = 1;
4654         struct ylist_head *lh;
4655
4656
4657         /* Iterate through the objects in each hash entry,
4658          * dumping them to the checkpointing stream.
4659          */
4660
4661         for (i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++) {
4662                 ylist_for_each(lh, &dev->objectBucket[i].list) {
4663                         if (lh) {
4664                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
4665                                 if (!obj->deferedFree) {
4666                                         yaffs_ObjectToCheckpointObject(&cp, obj);
4667                                         cp.structType = sizeof(cp);
4668
4669                                         T(YAFFS_TRACE_CHECKPOINT, (
4670                                                 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %p" TENDSTR),
4671                                                 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, obj));
4672
4673                                         ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4674
4675                                         if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4676                                                 ok = yaffs_WriteCheckpointTnodes(obj);
4677                                 }
4678                         }
4679                 }
4680         }
4681
4682         /* Dump end of list */
4683         memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
4684         cp.structType = sizeof(cp);
4685
4686         if (ok)
4687                 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4688
4689         return ok ? 1 : 0;
4690 }
4691
4692 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4693 {
4694         yaffs_Object *obj;
4695         yaffs_CheckpointObject cp;
4696         int ok = 1;
4697         int done = 0;
4698         yaffs_Object *hardList = NULL;
4699
4700         while (ok && !done) {
4701                 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4702                 if (cp.structType != sizeof(cp)) {
4703                         T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
4704                                 cp.structType, (int)sizeof(cp), ok));
4705                         ok = 0;
4706                 }
4707
4708                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4709                         cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
4710
4711                 if (ok && cp.objectId == ~0)
4712                         done = 1;
4713                 else if (ok) {
4714                         obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
4715                         if (obj) {
4716                                 ok = yaffs_CheckpointObjectToObject(obj, &cp);
4717                                 if (!ok)
4718                                         break;
4719                                 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4720                                         ok = yaffs_ReadCheckpointTnodes(obj);
4721                                 } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4722                                         obj->hardLinks.next =
4723                                                 (struct ylist_head *) hardList;
4724                                         hardList = obj;
4725                                 }
4726                         } else
4727                                 ok = 0;
4728                 }
4729         }
4730
4731         if (ok)
4732                 yaffs_HardlinkFixup(dev, hardList);
4733
4734         return ok ? 1 : 0;
4735 }
4736
4737 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4738 {
4739         __u32 checkpointSum;
4740         int ok;
4741
4742         yaffs_GetCheckpointSum(dev, &checkpointSum);
4743
4744         ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
4745
4746         if (!ok)
4747                 return 0;
4748
4749         return 1;
4750 }
4751
4752 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4753 {
4754         __u32 checkpointSum0;
4755         __u32 checkpointSum1;
4756         int ok;
4757
4758         yaffs_GetCheckpointSum(dev, &checkpointSum0);
4759
4760         ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4761
4762         if (!ok)
4763                 return 0;
4764
4765         if (checkpointSum0 != checkpointSum1)
4766                 return 0;
4767
4768         return 1;
4769 }
4770
4771
4772 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4773 {
4774         int ok = 1;
4775
4776         if (dev->param.skipCheckpointWrite || !dev->param.isYaffs2) {
4777                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
4778                 ok = 0;
4779         }
4780
4781         if (ok)
4782                 ok = yaffs_CheckpointOpen(dev, 1);
4783
4784         if (ok) {
4785                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4786                 ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
4787         }
4788         if (ok) {
4789                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
4790                 ok = yaffs_WriteCheckpointDevice(dev);
4791         }
4792         if (ok) {
4793                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
4794                 ok = yaffs_WriteCheckpointObjects(dev);
4795         }
4796         if (ok) {
4797                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4798                 ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
4799         }
4800
4801         if (ok)
4802                 ok = yaffs_WriteCheckpointSum(dev);
4803
4804         if (!yaffs_CheckpointClose(dev))
4805                 ok = 0;
4806
4807         if (ok)
4808                 dev->isCheckpointed = 1;
4809         else
4810                 dev->isCheckpointed = 0;
4811
4812         return dev->isCheckpointed;
4813 }
4814
4815 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4816 {
4817         int ok = 1;
4818
4819         if (dev->param.skipCheckpointRead || !dev->param.isYaffs2) {
4820                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
4821                 ok = 0;
4822         }
4823
4824         if (ok)
4825                 ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
4826
4827         if (ok) {
4828                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4829                 ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
4830         }
4831         if (ok) {
4832                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
4833                 ok = yaffs_ReadCheckpointDevice(dev);
4834         }
4835         if (ok) {
4836                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
4837                 ok = yaffs_ReadCheckpointObjects(dev);
4838         }
4839         if (ok) {
4840                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4841                 ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
4842         }
4843
4844         if (ok) {
4845                 ok = yaffs_ReadCheckpointSum(dev);
4846                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
4847         }
4848
4849         if (!yaffs_CheckpointClose(dev))
4850                 ok = 0;
4851
4852         if (ok)
4853                 dev->isCheckpointed = 1;
4854         else
4855                 dev->isCheckpointed = 0;
4856
4857         return ok ? 1 : 0;
4858
4859 }
4860
4861 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4862 {
4863         if (dev->isCheckpointed ||
4864                         dev->blocksInCheckpoint > 0) {
4865                 dev->isCheckpointed = 0;
4866                 yaffs_CheckpointInvalidateStream(dev);
4867         }
4868         if (dev->param.markSuperBlockDirty)
4869                 dev->param.markSuperBlockDirty(dev);
4870 }
4871
4872
4873 int yaffs_CheckpointSave(yaffs_Device *dev)
4874 {
4875
4876         T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4877
4878         yaffs_VerifyObjects(dev);
4879         yaffs_VerifyBlocks(dev);
4880         yaffs_VerifyFreeChunks(dev);
4881
4882         if (!dev->isCheckpointed) {
4883                 yaffs_InvalidateCheckpoint(dev);
4884                 yaffs_WriteCheckpointData(dev);
4885         }
4886
4887         T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4888
4889         return dev->isCheckpointed;
4890 }
4891
4892 int yaffs_CheckpointRestore(yaffs_Device *dev)
4893 {
4894         int retval;
4895         T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4896
4897         retval = yaffs_ReadCheckpointData(dev);
4898
4899         if (dev->isCheckpointed) {
4900                 yaffs_VerifyObjects(dev);
4901                 yaffs_VerifyBlocks(dev);
4902                 yaffs_VerifyFreeChunks(dev);
4903         }
4904
4905         T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4906
4907         return retval;
4908 }
4909
4910 /*--------------------- File read/write ------------------------
4911  * Read and write have very similar structures.
4912  * In general the read/write has three parts to it
4913  * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4914  * Some complete chunks
4915  * An incomplete chunk to end off with
4916  *
4917  * Curve-balls: the first chunk might also be the last chunk.
4918  */
4919
4920 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
4921                         int nBytes)
4922 {
4923
4924         int chunk;
4925         __u32 start;
4926         int nToCopy;
4927         int n = nBytes;
4928         int nDone = 0;
4929         yaffs_ChunkCache *cache;
4930
4931         yaffs_Device *dev;
4932
4933         dev = in->myDev;
4934
4935         while (n > 0) {
4936                 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4937                 /* start = offset % dev->nDataBytesPerChunk; */
4938                 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4939                 chunk++;
4940
4941                 /* OK now check for the curveball where the start and end are in
4942                  * the same chunk.
4943                  */
4944                 if ((start + n) < dev->nDataBytesPerChunk)
4945                         nToCopy = n;
4946                 else
4947                         nToCopy = dev->nDataBytesPerChunk - start;
4948
4949                 cache = yaffs_FindChunkCache(in, chunk);
4950
4951                 /* If the chunk is already in the cache or it is less than a whole chunk
4952                  * or we're using inband tags then use the cache (if there is caching)
4953                  * else bypass the cache.
4954                  */
4955                 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
4956                         if (dev->param.nShortOpCaches > 0) {
4957
4958                                 /* If we can't find the data in the cache, then load it up. */
4959
4960                                 if (!cache) {
4961                                         cache = yaffs_GrabChunkCache(in->myDev);
4962                                         cache->object = in;
4963                                         cache->chunkId = chunk;
4964                                         cache->dirty = 0;
4965                                         cache->locked = 0;
4966                                         yaffs_ReadChunkDataFromObject(in, chunk,
4967                                                                       cache->
4968                                                                       data);
4969                                         cache->nBytes = 0;
4970                                 }
4971
4972                                 yaffs_UseChunkCache(dev, cache, 0);
4973
4974                                 cache->locked = 1;
4975
4976
4977                                 memcpy(buffer, &cache->data[start], nToCopy);
4978
4979                                 cache->locked = 0;
4980                         } else {
4981                                 /* Read into the local buffer then copy..*/
4982
4983                                 __u8 *localBuffer =
4984                                     yaffs_GetTempBuffer(dev, __LINE__);
4985                                 yaffs_ReadChunkDataFromObject(in, chunk,
4986                                                               localBuffer);
4987
4988                                 memcpy(buffer, &localBuffer[start], nToCopy);
4989
4990
4991                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
4992                                                         __LINE__);
4993                         }
4994
4995                 } else {
4996
4997                         /* A full chunk. Read directly into the supplied buffer. */
4998                         yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4999
5000                 }
5001
5002                 n -= nToCopy;
5003                 offset += nToCopy;
5004                 buffer += nToCopy;
5005                 nDone += nToCopy;
5006
5007         }
5008
5009         return nDone;
5010 }
5011
5012 int yaffs_DoWriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
5013                         int nBytes, int writeThrough)
5014 {
5015
5016         int chunk;
5017         __u32 start;
5018         int nToCopy;
5019         int n = nBytes;
5020         int nDone = 0;
5021         int nToWriteBack;
5022         int startOfWrite = offset;
5023         int chunkWritten = 0;
5024         __u32 nBytesRead;
5025         __u32 chunkStart;
5026
5027         yaffs_Device *dev;
5028
5029         dev = in->myDev;
5030
5031         while (n > 0 && chunkWritten >= 0) {
5032                 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
5033                 /* start = offset % dev->nDataBytesPerChunk; */
5034                 yaffs_AddrToChunk(dev, offset, &chunk, &start);
5035
5036                 if (chunk * dev->nDataBytesPerChunk + start != offset ||
5037                                 start >= dev->nDataBytesPerChunk) {
5038                         T(YAFFS_TRACE_ERROR, (
5039                            TSTR("AddrToChunk of offset %d gives chunk %d start %d"
5040                            TENDSTR),
5041                            (int)offset, chunk, start));
5042                 }
5043                 chunk++;
5044
5045                 /* OK now check for the curveball where the start and end are in
5046                  * the same chunk.
5047                  */
5048
5049                 if ((start + n) < dev->nDataBytesPerChunk) {
5050                         nToCopy = n;
5051
5052                         /* Now folks, to calculate how many bytes to write back....
5053                          * If we're overwriting and not writing to then end of file then
5054                          * we need to write back as much as was there before.
5055                          */
5056
5057                         chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
5058
5059                         if (chunkStart > in->variant.fileVariant.fileSize)
5060                                 nBytesRead = 0; /* Past end of file */
5061                         else
5062                                 nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
5063
5064                         if (nBytesRead > dev->nDataBytesPerChunk)
5065                                 nBytesRead = dev->nDataBytesPerChunk;
5066
5067                         nToWriteBack =
5068                             (nBytesRead >
5069                              (start + n)) ? nBytesRead : (start + n);
5070
5071                         if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
5072                                 YBUG();
5073
5074                 } else {
5075                         nToCopy = dev->nDataBytesPerChunk - start;
5076                         nToWriteBack = dev->nDataBytesPerChunk;
5077                 }
5078
5079                 if (nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
5080                         /* An incomplete start or end chunk (or maybe both start and end chunk),
5081                          * or we're using inband tags, so we want to use the cache buffers.
5082                          */
5083                         if (dev->param.nShortOpCaches > 0) {
5084                                 yaffs_ChunkCache *cache;
5085                                 /* If we can't find the data in the cache, then load the cache */
5086                                 cache = yaffs_FindChunkCache(in, chunk);
5087
5088                                 if (!cache
5089                                     && yaffs_CheckSpaceForAllocation(dev, 1)) {
5090                                         cache = yaffs_GrabChunkCache(dev);
5091                                         cache->object = in;
5092                                         cache->chunkId = chunk;
5093                                         cache->dirty = 0;
5094                                         cache->locked = 0;
5095                                         yaffs_ReadChunkDataFromObject(in, chunk,
5096                                                                       cache->data);
5097                                 } else if (cache &&
5098                                         !cache->dirty &&
5099                                         !yaffs_CheckSpaceForAllocation(dev, 1)) {
5100                                         /* Drop the cache if it was a read cache item and
5101                                          * no space check has been made for it.
5102                                          */
5103                                          cache = NULL;
5104                                 }
5105
5106                                 if (cache) {
5107                                         yaffs_UseChunkCache(dev, cache, 1);
5108                                         cache->locked = 1;
5109
5110
5111                                         memcpy(&cache->data[start], buffer,
5112                                                nToCopy);
5113
5114
5115                                         cache->locked = 0;
5116                                         cache->nBytes = nToWriteBack;
5117
5118                                         if (writeThrough) {
5119                                                 chunkWritten =
5120                                                     yaffs_WriteChunkDataToObject
5121                                                     (cache->object,
5122                                                      cache->chunkId,
5123                                                      cache->data, cache->nBytes,
5124                                                      1);
5125                                                 cache->dirty = 0;
5126                                         }
5127
5128                                 } else {
5129                                         chunkWritten = -1;      /* fail the write */
5130                                 }
5131                         } else {
5132                                 /* An incomplete start or end chunk (or maybe both start and end chunk)
5133                                  * Read into the local buffer then copy, then copy over and write back.
5134                                  */
5135
5136                                 __u8 *localBuffer =
5137                                     yaffs_GetTempBuffer(dev, __LINE__);
5138
5139                                 yaffs_ReadChunkDataFromObject(in, chunk,
5140                                                               localBuffer);
5141
5142
5143
5144                                 memcpy(&localBuffer[start], buffer, nToCopy);
5145
5146                                 chunkWritten =
5147                                     yaffs_WriteChunkDataToObject(in, chunk,
5148                                                                  localBuffer,
5149                                                                  nToWriteBack,
5150                                                                  0);
5151
5152                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
5153                                                         __LINE__);
5154
5155                         }
5156
5157                 } else {
5158                         /* A full chunk. Write directly from the supplied buffer. */
5159
5160
5161
5162                         chunkWritten =
5163                             yaffs_WriteChunkDataToObject(in, chunk, buffer,
5164                                                          dev->nDataBytesPerChunk,
5165                                                          0);
5166
5167                         /* Since we've overwritten the cached data, we better invalidate it. */
5168                         yaffs_InvalidateChunkCache(in, chunk);
5169                 }
5170
5171                 if (chunkWritten >= 0) {
5172                         n -= nToCopy;
5173                         offset += nToCopy;
5174                         buffer += nToCopy;
5175                         nDone += nToCopy;
5176                 }
5177
5178         }
5179
5180         /* Update file object */
5181
5182         if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
5183                 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
5184
5185         in->dirty = 1;
5186
5187         return nDone;
5188 }
5189
5190 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
5191                         int nBytes, int writeThrough)
5192 {
5193         yaffs_HandleHole(in,offset);
5194         return yaffs_DoWriteDataToFile(in,buffer,offset,nBytes,writeThrough);
5195 }
5196
5197
5198
5199 /* ---------------------- File resizing stuff ------------------ */
5200
5201 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
5202 {
5203
5204         yaffs_Device *dev = in->myDev;
5205         int oldFileSize = in->variant.fileVariant.fileSize;
5206
5207         int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
5208
5209         int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
5210             dev->nDataBytesPerChunk;
5211         int i;
5212         int chunkId;
5213
5214         /* Delete backwards so that we don't end up with holes if
5215          * power is lost part-way through the operation.
5216          */
5217         for (i = lastDel; i >= startDel; i--) {
5218                 /* NB this could be optimised somewhat,
5219                  * eg. could retrieve the tags and write them without
5220                  * using yaffs_DeleteChunk
5221                  */
5222
5223                 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
5224                 if (chunkId > 0) {
5225                         if (chunkId <
5226                             (dev->internalStartBlock * dev->param.nChunksPerBlock)
5227                             || chunkId >=
5228                             ((dev->internalEndBlock +
5229                               1) * dev->param.nChunksPerBlock)) {
5230                                 T(YAFFS_TRACE_ALWAYS,
5231                                   (TSTR("Found daft chunkId %d for %d" TENDSTR),
5232                                    chunkId, i));
5233                         } else {
5234                                 in->nDataChunks--;
5235                                 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
5236                         }
5237                 }
5238         }
5239
5240 }
5241
5242
5243 static void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize)
5244 {
5245         int newFullChunks;
5246         __u32 newSizeOfPartialChunk;
5247         yaffs_Device *dev = obj->myDev;
5248
5249         yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
5250
5251         yaffs_PruneResizedChunks(obj, newSize);
5252
5253         if (newSizeOfPartialChunk != 0) {
5254                 int lastChunk = 1 + newFullChunks;
5255                 __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
5256
5257                 /* Got to read and rewrite the last chunk with its new size and zero pad */
5258                 yaffs_ReadChunkDataFromObject(obj, lastChunk, localBuffer);
5259                 memset(localBuffer + newSizeOfPartialChunk, 0,
5260                         dev->nDataBytesPerChunk - newSizeOfPartialChunk);
5261
5262                 yaffs_WriteChunkDataToObject(obj, lastChunk, localBuffer,
5263                                              newSizeOfPartialChunk, 1);
5264
5265                 yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
5266         }
5267
5268         obj->variant.fileVariant.fileSize = newSize;
5269
5270         yaffs_PruneFileStructure(dev, &obj->variant.fileVariant);
5271 }
5272
5273
5274 static int yaffs_HandleHole(yaffs_Object *obj, loff_t newSize)
5275 {
5276         /* if newsSize > oldFileSize.
5277          * We're going to be writing a hole.
5278          * If the hole is small then write zeros otherwise write a start of hole marker.
5279          */
5280
5281
5282         loff_t oldFileSize;
5283         int increase;
5284         int smallHole   ;
5285         int result = YAFFS_OK;
5286         yaffs_Device *dev = NULL;
5287
5288         __u8 *localBuffer = NULL;
5289
5290         int smallIncreaseOk = 0;
5291
5292         if(!obj)
5293                 return YAFFS_FAIL;
5294
5295         if(obj->variantType != YAFFS_OBJECT_TYPE_FILE)
5296                 return YAFFS_FAIL;
5297
5298         dev = obj->myDev;
5299
5300         /* Bail out if not yaffs2 mode */
5301         if(!dev->param.isYaffs2)
5302                 return YAFFS_OK;
5303
5304         oldFileSize = obj->variant.fileVariant.fileSize;
5305
5306         if (newSize <= oldFileSize)
5307                 return YAFFS_OK;
5308
5309         increase = newSize - oldFileSize;
5310
5311         if(increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->nDataBytesPerChunk &&
5312                 yaffs_CheckSpaceForAllocation(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
5313                 smallHole = 1;
5314         else
5315                 smallHole = 0;
5316
5317         if(smallHole)
5318                 localBuffer= yaffs_GetTempBuffer(dev, __LINE__);
5319
5320         if(localBuffer){
5321                 /* fill hole with zero bytes */
5322                 int pos = oldFileSize;
5323                 int thisWrite;
5324                 int written;
5325                 memset(localBuffer,0,dev->nDataBytesPerChunk);
5326                 smallIncreaseOk = 1;
5327
5328                 while(increase > 0 && smallIncreaseOk){
5329                         thisWrite = increase;
5330                         if(thisWrite > dev->nDataBytesPerChunk)
5331                                 thisWrite = dev->nDataBytesPerChunk;
5332                         written = yaffs_DoWriteDataToFile(obj,localBuffer,pos,thisWrite,0);
5333                         if(written == thisWrite){
5334                                 pos += thisWrite;
5335                                 increase -= thisWrite;
5336                         } else
5337                                 smallIncreaseOk = 0;
5338                 }
5339
5340                 yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
5341
5342                 /* If we were out of space then reverse any chunks we've added */
5343                 if(!smallIncreaseOk)
5344                         yaffs_ResizeDown(obj, oldFileSize);
5345         }
5346
5347         if (!smallIncreaseOk &&
5348                 obj->parent &&
5349                 obj->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5350                 obj->parent->objectId != YAFFS_OBJECTID_DELETED){
5351                 /* Write a hole start header with the old file size */
5352                 yaffs_UpdateObjectHeader(obj, NULL, 0,1,0);
5353         }
5354
5355         return result;
5356
5357 }
5358
5359 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
5360 {
5361         yaffs_Device *dev = in->myDev;
5362         int oldFileSize = in->variant.fileVariant.fileSize;
5363
5364         yaffs_FlushFilesChunkCache(in);
5365         yaffs_InvalidateWholeChunkCache(in);
5366
5367         yaffs_CheckGarbageCollection(dev);
5368
5369         if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
5370                 return YAFFS_FAIL;
5371
5372         if (newSize == oldFileSize)
5373                 return YAFFS_OK;
5374
5375         if(newSize > oldFileSize){
5376                 yaffs_HandleHole(in,newSize);
5377                 in->variant.fileVariant.fileSize = newSize;
5378         } else {
5379                 /* newSize < oldFileSize */
5380                 yaffs_ResizeDown(in, newSize);
5381         }
5382
5383         /* Write a new object header to reflect the resize.
5384          * show we've shrunk the file, if need be
5385          * Do this only if the file is not in the deleted directories
5386          * and is not shadowed.
5387          */
5388         if (in->parent &&
5389             !in->isShadowed &&
5390             in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5391             in->parent->objectId != YAFFS_OBJECTID_DELETED)
5392                 yaffs_UpdateObjectHeader(in, NULL, 0,0,0);
5393
5394
5395         return YAFFS_OK;
5396 }
5397
5398 loff_t yaffs_GetFileSize(yaffs_Object *obj)
5399 {
5400         YCHAR *alias = NULL;
5401         obj = yaffs_GetEquivalentObject(obj);
5402
5403         switch (obj->variantType) {
5404         case YAFFS_OBJECT_TYPE_FILE:
5405                 return obj->variant.fileVariant.fileSize;
5406         case YAFFS_OBJECT_TYPE_SYMLINK:
5407                 alias = obj->variant.symLinkVariant.alias;
5408                 if(!alias)
5409                         return 0;
5410                 return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
5411         default:
5412                 return 0;
5413         }
5414 }
5415
5416
5417
5418 int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
5419 {
5420         int retVal;
5421         if (in->dirty) {
5422                 yaffs_FlushFilesChunkCache(in);
5423                 if(dataSync) /* Only sync data */
5424                         retVal=YAFFS_OK;
5425                 else {
5426                         if (updateTime) {
5427 #ifdef CONFIG_YAFFS_WINCE
5428                                 yfsd_WinFileTimeNow(in->win_mtime);
5429 #else
5430
5431                                 in->yst_mtime = Y_CURRENT_TIME;
5432
5433 #endif
5434                         }
5435
5436                         retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5437                                 0) ? YAFFS_OK : YAFFS_FAIL;
5438                 }
5439         } else {
5440                 retVal = YAFFS_OK;
5441         }
5442
5443         return retVal;
5444
5445 }
5446
5447 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
5448 {
5449
5450         /* First off, invalidate the file's data in the cache, without flushing. */
5451         yaffs_InvalidateWholeChunkCache(in);
5452
5453         if (in->myDev->param.isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5454                 /* Move to the unlinked directory so we have a record that it was deleted. */
5455                 yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
5456
5457         }
5458
5459         yaffs_RemoveObjectFromDirectory(in);
5460         yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
5461         in->hdrChunk = 0;
5462
5463         yaffs_FreeObject(in);
5464         return YAFFS_OK;
5465
5466 }
5467
5468 /* yaffs_DeleteFile deletes the whole file data
5469  * and the inode associated with the file.
5470  * It does not delete the links associated with the file.
5471  */
5472 static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
5473 {
5474
5475         int retVal;
5476         int immediateDeletion = 0;
5477
5478         if (!in->myInode)
5479                 immediateDeletion = 1;
5480
5481         if (immediateDeletion) {
5482                 retVal =
5483                     yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5484                                            _Y("deleted"), 0, 0);
5485                 T(YAFFS_TRACE_TRACING,
5486                   (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5487                    in->objectId));
5488                 in->deleted = 1;
5489                 in->myDev->nDeletedFiles++;
5490                 if (1 || in->myDev->param.isYaffs2)
5491                         yaffs_ResizeFile(in, 0);
5492                 yaffs_SoftDeleteFile(in);
5493         } else {
5494                 retVal =
5495                     yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5496                                            _Y("unlinked"), 0, 0);
5497         }
5498
5499
5500         return retVal;
5501 }
5502
5503 int yaffs_DeleteFile(yaffs_Object *in)
5504 {
5505         int retVal = YAFFS_OK;
5506         int deleted = in->deleted;
5507
5508         yaffs_ResizeFile(in, 0);
5509
5510         if (in->nDataChunks > 0) {
5511                 /* Use soft deletion if there is data in the file.
5512                  * That won't be the case if it has been resized to zero.
5513                  */
5514                 if (!in->unlinked)
5515                         retVal = yaffs_UnlinkFileIfNeeded(in);
5516
5517                 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5518                         in->deleted = 1;
5519                         deleted = 1;
5520                         in->myDev->nDeletedFiles++;
5521                         yaffs_SoftDeleteFile(in);
5522                 }
5523                 return deleted ? YAFFS_OK : YAFFS_FAIL;
5524         } else {
5525                 /* The file has no data chunks so we toss it immediately */
5526                 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5527                 in->variant.fileVariant.top = NULL;
5528                 yaffs_DoGenericObjectDeletion(in);
5529
5530                 return YAFFS_OK;
5531         }
5532 }
5533
5534 static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
5535 {
5536         return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
5537                 !(ylist_empty(&obj->variant.directoryVariant.children));
5538 }
5539
5540 static int yaffs_DeleteDirectory(yaffs_Object *obj)
5541 {
5542         /* First check that the directory is empty. */
5543         if (yaffs_IsNonEmptyDirectory(obj))
5544                 return YAFFS_FAIL;
5545
5546         return yaffs_DoGenericObjectDeletion(obj);
5547 }
5548
5549 static int yaffs_DeleteSymLink(yaffs_Object *in)
5550 {
5551         if(in->variant.symLinkVariant.alias)
5552                 YFREE(in->variant.symLinkVariant.alias);
5553         in->variant.symLinkVariant.alias=NULL;
5554
5555         return yaffs_DoGenericObjectDeletion(in);
5556 }
5557
5558 static int yaffs_DeleteHardLink(yaffs_Object *in)
5559 {
5560         /* remove this hardlink from the list assocaited with the equivalent
5561          * object
5562          */
5563         ylist_del_init(&in->hardLinks);
5564         return yaffs_DoGenericObjectDeletion(in);
5565 }
5566
5567 int yaffs_DeleteObject(yaffs_Object *obj)
5568 {
5569 int retVal = -1;
5570         switch (obj->variantType) {
5571         case YAFFS_OBJECT_TYPE_FILE:
5572                 retVal = yaffs_DeleteFile(obj);
5573                 break;
5574         case YAFFS_OBJECT_TYPE_DIRECTORY:
5575                 if(!ylist_empty(&obj->variant.directoryVariant.dirty)){
5576                         T(YAFFS_TRACE_BACKGROUND, (TSTR("Remove object %d from dirty directories" TENDSTR),obj->objectId));
5577                         ylist_del_init(&obj->variant.directoryVariant.dirty);
5578                 }
5579                 return yaffs_DeleteDirectory(obj);
5580                 break;
5581         case YAFFS_OBJECT_TYPE_SYMLINK:
5582                 retVal = yaffs_DeleteSymLink(obj);
5583                 break;
5584         case YAFFS_OBJECT_TYPE_HARDLINK:
5585                 retVal = yaffs_DeleteHardLink(obj);
5586                 break;
5587         case YAFFS_OBJECT_TYPE_SPECIAL:
5588                 retVal = yaffs_DoGenericObjectDeletion(obj);
5589                 break;
5590         case YAFFS_OBJECT_TYPE_UNKNOWN:
5591                 retVal = 0;
5592                 break;          /* should not happen. */
5593         }
5594
5595         return retVal;
5596 }
5597
5598 static int yaffs_UnlinkWorker(yaffs_Object *obj)
5599 {
5600
5601         int immediateDeletion = 0;
5602
5603         if (!obj->myInode)
5604                 immediateDeletion = 1;
5605
5606         if(obj)
5607                 yaffs_UpdateParent(obj->parent);
5608
5609         if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5610                 return yaffs_DeleteHardLink(obj);
5611         } else if (!ylist_empty(&obj->hardLinks)) {
5612                 /* Curve ball: We're unlinking an object that has a hardlink.
5613                  *
5614                  * This problem arises because we are not strictly following
5615                  * The Linux link/inode model.
5616                  *
5617                  * We can't really delete the object.
5618                  * Instead, we do the following:
5619                  * - Select a hardlink.
5620                  * - Unhook it from the hard links
5621                  * - Move it from its parent directory (so that the rename can work)
5622                  * - Rename the object to the hardlink's name.
5623                  * - Delete the hardlink
5624                  */
5625
5626                 yaffs_Object *hl;
5627                 yaffs_Object *parent;
5628                 int retVal;
5629                 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5630
5631                 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5632
5633                 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5634                 parent = hl->parent;
5635
5636                 ylist_del_init(&hl->hardLinks);
5637
5638                 yaffs_AddObjectToDirectory(obj->myDev->unlinkedDir, hl);
5639
5640                 retVal = yaffs_ChangeObjectName(obj,parent, name, 0, 0);
5641
5642                 if (retVal == YAFFS_OK)
5643                         retVal = yaffs_DoGenericObjectDeletion(hl);
5644
5645                 return retVal;
5646
5647         } else if (immediateDeletion) {
5648                 switch (obj->variantType) {
5649                 case YAFFS_OBJECT_TYPE_FILE:
5650                         return yaffs_DeleteFile(obj);
5651                         break;
5652                 case YAFFS_OBJECT_TYPE_DIRECTORY:
5653                         ylist_del_init(&obj->variant.directoryVariant.dirty);
5654                         return yaffs_DeleteDirectory(obj);
5655                         break;
5656                 case YAFFS_OBJECT_TYPE_SYMLINK:
5657                         return yaffs_DeleteSymLink(obj);
5658                         break;
5659                 case YAFFS_OBJECT_TYPE_SPECIAL:
5660                         return yaffs_DoGenericObjectDeletion(obj);
5661                         break;
5662                 case YAFFS_OBJECT_TYPE_HARDLINK:
5663                 case YAFFS_OBJECT_TYPE_UNKNOWN:
5664                 default:
5665                         return YAFFS_FAIL;
5666                 }
5667         } else if(yaffs_IsNonEmptyDirectory(obj))
5668                 return YAFFS_FAIL;
5669         else
5670                 return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
5671                                            _Y("unlinked"), 0, 0);
5672 }
5673
5674
5675 static int yaffs_UnlinkObject(yaffs_Object *obj)
5676 {
5677
5678         if (obj && obj->unlinkAllowed)
5679                 return yaffs_UnlinkWorker(obj);
5680
5681         return YAFFS_FAIL;
5682
5683 }
5684 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
5685 {
5686         yaffs_Object *obj;
5687
5688         obj = yaffs_FindObjectByName(dir, name);
5689         return yaffs_UnlinkObject(obj);
5690 }
5691
5692 /*----------------------- Initialisation Scanning ---------------------- */
5693
5694 static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
5695                                 int backwardScanning)
5696 {
5697         yaffs_Object *obj;
5698
5699         if (!backwardScanning) {
5700                 /* Handle YAFFS1 forward scanning case
5701                  * For YAFFS1 we always do the deletion
5702                  */
5703
5704         } else {
5705                 /* Handle YAFFS2 case (backward scanning)
5706                  * If the shadowed object exists then ignore.
5707                  */
5708                 obj = yaffs_FindObjectByNumber(dev, objId);
5709                 if(obj)
5710                         return;
5711         }
5712
5713         /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5714          * We put it in unlinked dir to be cleaned up after the scanning
5715          */
5716         obj =
5717             yaffs_FindOrCreateObjectByNumber(dev, objId,
5718                                              YAFFS_OBJECT_TYPE_FILE);
5719         if (!obj)
5720                 return;
5721         obj->isShadowed = 1;
5722         yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5723         obj->variant.fileVariant.shrinkSize = 0;
5724         obj->valid = 1;         /* So that we don't read any other info for this file */
5725
5726 }
5727
5728 typedef struct {
5729         int seq;
5730         int block;
5731 } yaffs_BlockIndex;
5732
5733
5734 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5735 {
5736         yaffs_Object *hl;
5737         yaffs_Object *in;
5738
5739         while (hardList) {
5740                 hl = hardList;
5741                 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5742
5743                 in = yaffs_FindObjectByNumber(dev,
5744                                               hl->variant.hardLinkVariant.
5745                                               equivalentObjectId);
5746
5747                 if (in) {
5748                         /* Add the hardlink pointers */
5749                         hl->variant.hardLinkVariant.equivalentObject = in;
5750                         ylist_add(&hl->hardLinks, &in->hardLinks);
5751                 } else {
5752                         /* Todo Need to report/handle this better.
5753                          * Got a problem... hardlink to a non-existant object
5754                          */
5755                         hl->variant.hardLinkVariant.equivalentObject = NULL;
5756                         YINIT_LIST_HEAD(&hl->hardLinks);
5757
5758                 }
5759         }
5760 }
5761
5762
5763
5764
5765
5766 static int ybicmp(const void *a, const void *b)
5767 {
5768         register int aseq = ((yaffs_BlockIndex *)a)->seq;
5769         register int bseq = ((yaffs_BlockIndex *)b)->seq;
5770         register int ablock = ((yaffs_BlockIndex *)a)->block;
5771         register int bblock = ((yaffs_BlockIndex *)b)->block;
5772         if (aseq == bseq)
5773                 return ablock - bblock;
5774         else
5775                 return aseq - bseq;
5776 }
5777
5778
5779 struct yaffs_ShadowFixerStruct {
5780         int objectId;
5781         int shadowedId;
5782         struct yaffs_ShadowFixerStruct *next;
5783 };
5784
5785
5786 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
5787 {
5788         /*
5789         *  Sort out state of unlinked and deleted objects after scanning.
5790         */
5791         struct ylist_head *i;
5792         struct ylist_head *n;
5793         yaffs_Object *l;
5794
5795         /* Soft delete all the unlinked files */
5796         ylist_for_each_safe(i, n,
5797                 &dev->unlinkedDir->variant.directoryVariant.children) {
5798                 if (i) {
5799                         l = ylist_entry(i, yaffs_Object, siblings);
5800                         yaffs_DeleteObject(l);
5801                 }
5802         }
5803
5804         ylist_for_each_safe(i, n,
5805                 &dev->deletedDir->variant.directoryVariant.children) {
5806                 if (i) {
5807                         l = ylist_entry(i, yaffs_Object, siblings);
5808                         yaffs_DeleteObject(l);
5809                 }
5810         }
5811
5812 }
5813
5814 /*
5815  * This code iterates through all the objects making sure that they are rooted.
5816  * Any unrooted objects are re-rooted in lost+found.
5817  * An object needs to be in one of:
5818  * - Directly under deleted, unlinked
5819  * - Directly or indirectly under root.
5820  *
5821  * Note:
5822  *  This code assumes that we don't ever change the current relationships between
5823  *  directories:
5824  *   rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL
5825  *   lostNfound->parent == rootDir
5826  *
5827  * This fixes the problem where directories might have inadvertently been deleted
5828  * leaving the object "hanging" without being rooted in the directory tree.
5829  */
5830
5831 static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj)
5832 {
5833         return (obj == dev->deletedDir ||
5834                 obj == dev->unlinkedDir||
5835                 obj == dev->rootDir);
5836 }
5837
5838 static void yaffs_FixHangingObjects(yaffs_Device *dev)
5839 {
5840         yaffs_Object *obj;
5841         yaffs_Object *parent;
5842         int i;
5843         struct ylist_head *lh;
5844         struct ylist_head *n;
5845         int depthLimit;
5846         int hanging;
5847
5848
5849         /* Iterate through the objects in each hash entry,
5850          * looking at each object.
5851          * Make sure it is rooted.
5852          */
5853
5854         for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
5855                 ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) {
5856                         if (lh) {
5857                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
5858                                 parent= obj->parent;
5859
5860                                 if(yaffs_HasNULLParent(dev,obj)){
5861                                         /* These directories are not hanging */
5862                                         hanging = 0;
5863                                 }
5864                                 else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5865                                         hanging = 1;
5866                                 else if(yaffs_HasNULLParent(dev,parent))
5867                                         hanging = 0;
5868                                 else {
5869                                         /*
5870                                          * Need to follow the parent chain to see if it is hanging.
5871                                          */
5872                                         hanging = 0;
5873                                         depthLimit=100;
5874
5875                                         while(parent != dev->rootDir &&
5876                                                 parent->parent &&
5877                                                 parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
5878                                                 depthLimit > 0){
5879                                                 parent = parent->parent;
5880                                                 depthLimit--;
5881                                         }
5882                                         if(parent != dev->rootDir)
5883                                                 hanging = 1;
5884                                 }
5885                                 if(hanging){
5886                                         T(YAFFS_TRACE_SCAN,
5887                                           (TSTR("Hanging object %d moved to lost and found" TENDSTR),
5888                                                 obj->objectId));
5889                                         yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj);
5890                                 }
5891                         }
5892                 }
5893         }
5894 }
5895
5896
5897 /*
5898  * Delete directory contents for cleaning up lost and found.
5899  */
5900 static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
5901 {
5902         yaffs_Object *obj;
5903         struct ylist_head *lh;
5904         struct ylist_head *n;
5905
5906         if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5907                 YBUG();
5908
5909         ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) {
5910                 if (lh) {
5911                         obj = ylist_entry(lh, yaffs_Object, siblings);
5912                         if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
5913                                 yaffs_DeleteDirectoryContents(obj);
5914
5915                         T(YAFFS_TRACE_SCAN,
5916                                 (TSTR("Deleting lost_found object %d" TENDSTR),
5917                                 obj->objectId));
5918
5919                         /* Need to use UnlinkObject since Delete would not handle
5920                          * hardlinked objects correctly.
5921                          */
5922                         yaffs_UnlinkObject(obj);
5923                 }
5924         }
5925
5926 }
5927
5928 static void yaffs_EmptyLostAndFound(yaffs_Device *dev)
5929 {
5930         yaffs_DeleteDirectoryContents(dev->lostNFoundDir);
5931 }
5932
5933 static int yaffs_Scan(yaffs_Device *dev)
5934 {
5935         yaffs_ExtendedTags tags;
5936         int blk;
5937         int blockIterator;
5938         int startIterator;
5939         int endIterator;
5940         int result;
5941
5942         int chunk;
5943         int c;
5944         int deleted;
5945         yaffs_BlockState state;
5946         yaffs_Object *hardList = NULL;
5947         yaffs_BlockInfo *bi;
5948         __u32 sequenceNumber;
5949         yaffs_ObjectHeader *oh;
5950         yaffs_Object *in;
5951         yaffs_Object *parent;
5952
5953         int alloc_failed = 0;
5954
5955         struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
5956
5957
5958         __u8 *chunkData;
5959
5960
5961
5962         T(YAFFS_TRACE_SCAN,
5963           (TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
5964            dev->internalStartBlock, dev->internalEndBlock));
5965
5966         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5967
5968         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5969
5970         /* Scan all the blocks to determine their state */
5971         bi = dev->blockInfo;
5972         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5973                 yaffs_ClearChunkBits(dev, blk);
5974                 bi->pagesInUse = 0;
5975                 bi->softDeletions = 0;
5976
5977                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5978
5979                 bi->blockState = state;
5980                 bi->sequenceNumber = sequenceNumber;
5981
5982                 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
5983                         bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
5984
5985                 T(YAFFS_TRACE_SCAN_DEBUG,
5986                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5987                    state, sequenceNumber));
5988
5989                 if (state == YAFFS_BLOCK_STATE_DEAD) {
5990                         T(YAFFS_TRACE_BAD_BLOCKS,
5991                           (TSTR("block %d is bad" TENDSTR), blk));
5992                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5993                         T(YAFFS_TRACE_SCAN_DEBUG,
5994                           (TSTR("Block empty " TENDSTR)));
5995                         dev->nErasedBlocks++;
5996                         dev->nFreeChunks += dev->param.nChunksPerBlock;
5997                 }
5998                 bi++;
5999         }
6000
6001         startIterator = dev->internalStartBlock;
6002         endIterator = dev->internalEndBlock;
6003
6004         /* For each block.... */
6005         for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
6006              blockIterator++) {
6007
6008                 YYIELD();
6009
6010                 YYIELD();
6011
6012                 blk = blockIterator;
6013
6014                 bi = yaffs_GetBlockInfo(dev, blk);
6015                 state = bi->blockState;
6016
6017                 deleted = 0;
6018
6019                 /* For each chunk in each block that needs scanning....*/
6020                 for (c = 0; !alloc_failed && c < dev->param.nChunksPerBlock &&
6021                      state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
6022                         /* Read the tags and decide what to do */
6023                         chunk = blk * dev->param.nChunksPerBlock + c;
6024
6025                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6026                                                         &tags);
6027
6028                         /* Let's have a good look at this chunk... */
6029
6030                         if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
6031                                 /* YAFFS1 only...
6032                                  * A deleted chunk
6033                                  */
6034                                 deleted++;
6035                                 dev->nFreeChunks++;
6036                                 /*T((" %d %d deleted\n",blk,c)); */
6037                         } else if (!tags.chunkUsed) {
6038                                 /* An unassigned chunk in the block
6039                                  * This means that either the block is empty or
6040                                  * this is the one being allocated from
6041                                  */
6042
6043                                 if (c == 0) {
6044                                         /* We're looking at the first chunk in the block so the block is unused */
6045                                         state = YAFFS_BLOCK_STATE_EMPTY;
6046                                         dev->nErasedBlocks++;
6047                                 } else {
6048                                         /* this is the block being allocated from */
6049                                         T(YAFFS_TRACE_SCAN,
6050                                           (TSTR
6051                                            (" Allocating from %d %d" TENDSTR),
6052                                            blk, c));
6053                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
6054                                         dev->allocationBlock = blk;
6055                                         dev->allocationPage = c;
6056                                         dev->allocationBlockFinder = blk;
6057                                         /* Set block finder here to encourage the allocator to go forth from here. */
6058
6059                                 }
6060
6061                                 dev->nFreeChunks += (dev->param.nChunksPerBlock - c);
6062                         } else if (tags.chunkId > 0) {
6063                                 /* chunkId > 0 so it is a data chunk... */
6064                                 unsigned int endpos;
6065
6066                                 yaffs_SetChunkBit(dev, blk, c);
6067                                 bi->pagesInUse++;
6068
6069                                 in = yaffs_FindOrCreateObjectByNumber(dev,
6070                                                                       tags.
6071                                                                       objectId,
6072                                                                       YAFFS_OBJECT_TYPE_FILE);
6073                                 /* PutChunkIntoFile checks for a clash (two data chunks with
6074                                  * the same chunkId).
6075                                  */
6076
6077                                 if (!in)
6078                                         alloc_failed = 1;
6079
6080                                 if (in) {
6081                                         if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
6082                                                 alloc_failed = 1;
6083                                 }
6084
6085                                 endpos =
6086                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk +
6087                                     tags.byteCount;
6088                                 if (in &&
6089                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
6090                                     && in->variant.fileVariant.scannedFileSize <
6091                                     endpos) {
6092                                         in->variant.fileVariant.
6093                                             scannedFileSize = endpos;
6094                                         if (!dev->param.useHeaderFileSize) {
6095                                                 in->variant.fileVariant.
6096                                                     fileSize =
6097                                                     in->variant.fileVariant.
6098                                                     scannedFileSize;
6099                                         }
6100
6101                                 }
6102                                 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
6103                         } else {
6104                                 /* chunkId == 0, so it is an ObjectHeader.
6105                                  * Thus, we read in the object header and make the object
6106                                  */
6107                                 yaffs_SetChunkBit(dev, blk, c);
6108                                 bi->pagesInUse++;
6109
6110                                 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
6111                                                                 chunkData,
6112                                                                 NULL);
6113
6114                                 oh = (yaffs_ObjectHeader *) chunkData;
6115
6116                                 in = yaffs_FindObjectByNumber(dev,
6117                                                               tags.objectId);
6118                                 if (in && in->variantType != oh->type) {
6119                                         /* This should not happen, but somehow
6120                                          * Wev'e ended up with an objectId that has been reused but not yet
6121                                          * deleted, and worse still it has changed type. Delete the old object.
6122                                          */
6123
6124                                         yaffs_DeleteObject(in);
6125
6126                                         in = 0;
6127                                 }
6128
6129                                 in = yaffs_FindOrCreateObjectByNumber(dev,
6130                                                                       tags.
6131                                                                       objectId,
6132                                                                       oh->type);
6133
6134                                 if (!in)
6135                                         alloc_failed = 1;
6136
6137                                 if (in && oh->shadowsObject > 0) {
6138
6139                                         struct yaffs_ShadowFixerStruct *fixer;
6140                                         fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
6141                                         if (fixer) {
6142                                                 fixer->next = shadowFixerList;
6143                                                 shadowFixerList = fixer;
6144                                                 fixer->objectId = tags.objectId;
6145                                                 fixer->shadowedId = oh->shadowsObject;
6146                                         }
6147
6148                                 }
6149
6150                                 if (in && in->valid) {
6151                                         /* We have already filled this one. We have a duplicate and need to resolve it. */
6152
6153                                         unsigned existingSerial = in->serial;
6154                                         unsigned newSerial = tags.serialNumber;
6155
6156                                         if (((existingSerial + 1) & 3) == newSerial) {
6157                                                 /* Use new one - destroy the exisiting one */
6158                                                 yaffs_DeleteChunk(dev,
6159                                                                   in->hdrChunk,
6160                                                                   1, __LINE__);
6161                                                 in->valid = 0;
6162                                         } else {
6163                                                 /* Use existing - destroy this one. */
6164                                                 yaffs_DeleteChunk(dev, chunk, 1,
6165                                                                   __LINE__);
6166                                         }
6167                                 }
6168
6169                                 if (in && !in->valid &&
6170                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6171                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
6172                                         /* We only load some info, don't fiddle with directory structure */
6173                                         in->valid = 1;
6174                                         in->variantType = oh->type;
6175
6176                                         in->yst_mode = oh->yst_mode;
6177 #ifdef CONFIG_YAFFS_WINCE
6178                                         in->win_atime[0] = oh->win_atime[0];
6179                                         in->win_ctime[0] = oh->win_ctime[0];
6180                                         in->win_mtime[0] = oh->win_mtime[0];
6181                                         in->win_atime[1] = oh->win_atime[1];
6182                                         in->win_ctime[1] = oh->win_ctime[1];
6183                                         in->win_mtime[1] = oh->win_mtime[1];
6184 #else
6185                                         in->yst_uid = oh->yst_uid;
6186                                         in->yst_gid = oh->yst_gid;
6187                                         in->yst_atime = oh->yst_atime;
6188                                         in->yst_mtime = oh->yst_mtime;
6189                                         in->yst_ctime = oh->yst_ctime;
6190                                         in->yst_rdev = oh->yst_rdev;
6191 #endif
6192                                         in->hdrChunk = chunk;
6193                                         in->serial = tags.serialNumber;
6194
6195                                 } else if (in && !in->valid) {
6196                                         /* we need to load this info */
6197
6198                                         in->valid = 1;
6199                                         in->variantType = oh->type;
6200
6201                                         in->yst_mode = oh->yst_mode;
6202 #ifdef CONFIG_YAFFS_WINCE
6203                                         in->win_atime[0] = oh->win_atime[0];
6204                                         in->win_ctime[0] = oh->win_ctime[0];
6205                                         in->win_mtime[0] = oh->win_mtime[0];
6206                                         in->win_atime[1] = oh->win_atime[1];
6207                                         in->win_ctime[1] = oh->win_ctime[1];
6208                                         in->win_mtime[1] = oh->win_mtime[1];
6209 #else
6210                                         in->yst_uid = oh->yst_uid;
6211                                         in->yst_gid = oh->yst_gid;
6212                                         in->yst_atime = oh->yst_atime;
6213                                         in->yst_mtime = oh->yst_mtime;
6214                                         in->yst_ctime = oh->yst_ctime;
6215                                         in->yst_rdev = oh->yst_rdev;
6216 #endif
6217                                         in->hdrChunk = chunk;
6218                                         in->serial = tags.serialNumber;
6219
6220                                         yaffs_SetObjectName(in, oh->name);
6221                                         in->dirty = 0;
6222
6223                                         /* directory stuff...
6224                                          * hook up to parent
6225                                          */
6226
6227                                         parent =
6228                                             yaffs_FindOrCreateObjectByNumber
6229                                             (dev, oh->parentObjectId,
6230                                              YAFFS_OBJECT_TYPE_DIRECTORY);
6231                                         if (!parent)
6232                                                 alloc_failed = 1;
6233                                         if (parent && parent->variantType ==
6234                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
6235                                                 /* Set up as a directory */
6236                                                 parent->variantType =
6237                                                         YAFFS_OBJECT_TYPE_DIRECTORY;
6238                                                 YINIT_LIST_HEAD(&parent->variant.
6239                                                                 directoryVariant.
6240                                                                 children);
6241                                         } else if (!parent || parent->variantType !=
6242                                                    YAFFS_OBJECT_TYPE_DIRECTORY) {
6243                                                 /* Hoosterman, another problem....
6244                                                  * We're trying to use a non-directory as a directory
6245                                                  */
6246
6247                                                 T(YAFFS_TRACE_ERROR,
6248                                                   (TSTR
6249                                                    ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6250                                                     TENDSTR)));
6251                                                 parent = dev->lostNFoundDir;
6252                                         }
6253
6254                                         yaffs_AddObjectToDirectory(parent, in);
6255
6256                                         if (0 && (parent == dev->deletedDir ||
6257                                                   parent == dev->unlinkedDir)) {
6258                                                 in->deleted = 1;        /* If it is unlinked at start up then it wants deleting */
6259                                                 dev->nDeletedFiles++;
6260                                         }
6261                                         /* Note re hardlinks.
6262                                          * Since we might scan a hardlink before its equivalent object is scanned
6263                                          * we put them all in a list.
6264                                          * After scanning is complete, we should have all the objects, so we run through this
6265                                          * list and fix up all the chains.
6266                                          */
6267
6268                                         switch (in->variantType) {
6269                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
6270                                                 /* Todo got a problem */
6271                                                 break;
6272                                         case YAFFS_OBJECT_TYPE_FILE:
6273                                                 if (dev->param.useHeaderFileSize)
6274
6275                                                         in->variant.fileVariant.
6276                                                             fileSize =
6277                                                             oh->fileSize;
6278
6279                                                 break;
6280                                         case YAFFS_OBJECT_TYPE_HARDLINK:
6281                                                 in->variant.hardLinkVariant.
6282                                                         equivalentObjectId =
6283                                                         oh->equivalentObjectId;
6284                                                 in->hardLinks.next =
6285                                                         (struct ylist_head *)
6286                                                         hardList;
6287                                                 hardList = in;
6288                                                 break;
6289                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
6290                                                 /* Do nothing */
6291                                                 break;
6292                                         case YAFFS_OBJECT_TYPE_SPECIAL:
6293                                                 /* Do nothing */
6294                                                 break;
6295                                         case YAFFS_OBJECT_TYPE_SYMLINK:
6296                                                 in->variant.symLinkVariant.alias =
6297                                                     yaffs_CloneString(oh->alias);
6298                                                 if (!in->variant.symLinkVariant.alias)
6299                                                         alloc_failed = 1;
6300                                                 break;
6301                                         }
6302
6303                                 }
6304                         }
6305                 }
6306
6307                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6308                         /* If we got this far while scanning, then the block is fully allocated.*/
6309                         state = YAFFS_BLOCK_STATE_FULL;
6310                 }
6311
6312                 if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
6313                         /* If the block was partially allocated then treat it as fully allocated.*/
6314                         state = YAFFS_BLOCK_STATE_FULL;
6315                         dev->allocationBlock = -1;
6316                 }
6317
6318                 bi->blockState = state;
6319
6320                 /* Now let's see if it was dirty */
6321                 if (bi->pagesInUse == 0 &&
6322                     !bi->hasShrinkHeader &&
6323                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6324                         yaffs_BlockBecameDirty(dev, blk);
6325                 }
6326
6327         }
6328
6329
6330         /* Ok, we've done all the scanning.
6331          * Fix up the hard link chains.
6332          * We should now have scanned all the objects, now it's time to add these
6333          * hardlinks.
6334          */
6335
6336         yaffs_HardlinkFixup(dev, hardList);
6337
6338         /* Fix up any shadowed objects */
6339         {
6340                 struct yaffs_ShadowFixerStruct *fixer;
6341                 yaffs_Object *obj;
6342
6343                 while (shadowFixerList) {
6344                         fixer = shadowFixerList;
6345                         shadowFixerList = fixer->next;
6346                         /* Complete the rename transaction by deleting the shadowed object
6347                          * then setting the object header to unshadowed.
6348                          */
6349                         obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
6350                         if (obj)
6351                                 yaffs_DeleteObject(obj);
6352
6353                         obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
6354
6355                         if (obj)
6356                                 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6357
6358                         YFREE(fixer);
6359                 }
6360         }
6361
6362         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6363
6364         if (alloc_failed)
6365                 return YAFFS_FAIL;
6366
6367         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
6368
6369
6370         return YAFFS_OK;
6371 }
6372
6373 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
6374 {
6375         __u8 *chunkData;
6376         yaffs_ObjectHeader *oh;
6377         yaffs_Device *dev;
6378         yaffs_ExtendedTags tags;
6379         int result;
6380         int alloc_failed = 0;
6381
6382         if (!in)
6383                 return;
6384
6385         dev = in->myDev;
6386
6387 #if 0
6388         T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
6389                 in->objectId,
6390                 in->lazyLoaded ? "not yet" : "already"));
6391 #endif
6392
6393         if (in->lazyLoaded && in->hdrChunk > 0) {
6394                 in->lazyLoaded = 0;
6395                 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6396
6397                 result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
6398                 oh = (yaffs_ObjectHeader *) chunkData;
6399
6400                 in->yst_mode = oh->yst_mode;
6401 #ifdef CONFIG_YAFFS_WINCE
6402                 in->win_atime[0] = oh->win_atime[0];
6403                 in->win_ctime[0] = oh->win_ctime[0];
6404                 in->win_mtime[0] = oh->win_mtime[0];
6405                 in->win_atime[1] = oh->win_atime[1];
6406                 in->win_ctime[1] = oh->win_ctime[1];
6407                 in->win_mtime[1] = oh->win_mtime[1];
6408 #else
6409                 in->yst_uid = oh->yst_uid;
6410                 in->yst_gid = oh->yst_gid;
6411                 in->yst_atime = oh->yst_atime;
6412                 in->yst_mtime = oh->yst_mtime;
6413                 in->yst_ctime = oh->yst_ctime;
6414                 in->yst_rdev = oh->yst_rdev;
6415
6416 #endif
6417                 yaffs_SetObjectName(in, oh->name);
6418
6419                 if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6420                         in->variant.symLinkVariant.alias =
6421                                                     yaffs_CloneString(oh->alias);
6422                         if (!in->variant.symLinkVariant.alias)
6423                                 alloc_failed = 1; /* Not returned to caller */
6424                 }
6425
6426                 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6427         }
6428 }
6429
6430 static int yaffs_ScanBackwards(yaffs_Device *dev)
6431 {
6432         yaffs_ExtendedTags tags;
6433         int blk;
6434         int blockIterator;
6435         int startIterator;
6436         int endIterator;
6437         int nBlocksToScan = 0;
6438
6439         int chunk;
6440         int result;
6441         int c;
6442         int deleted;
6443         yaffs_BlockState state;
6444         yaffs_Object *hardList = NULL;
6445         yaffs_BlockInfo *bi;
6446         __u32 sequenceNumber;
6447         yaffs_ObjectHeader *oh;
6448         yaffs_Object *in;
6449         yaffs_Object *parent;
6450         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
6451         int itsUnlinked;
6452         __u8 *chunkData;
6453
6454         int fileSize;
6455         int isShrink;
6456         int foundChunksInBlock;
6457         int equivalentObjectId;
6458         int alloc_failed = 0;
6459
6460
6461         yaffs_BlockIndex *blockIndex = NULL;
6462         int altBlockIndex = 0;
6463
6464         if (!dev->param.isYaffs2) {
6465                 T(YAFFS_TRACE_SCAN,
6466                   (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
6467                 return YAFFS_FAIL;
6468         }
6469
6470         T(YAFFS_TRACE_SCAN,
6471           (TSTR
6472            ("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..."
6473             TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
6474
6475
6476         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
6477
6478         blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
6479
6480         if (!blockIndex) {
6481                 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
6482                 altBlockIndex = 1;
6483         }
6484
6485         if (!blockIndex) {
6486                 T(YAFFS_TRACE_SCAN,
6487                   (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
6488                 return YAFFS_FAIL;
6489         }
6490
6491         dev->blocksInCheckpoint = 0;
6492
6493         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6494
6495         /* Scan all the blocks to determine their state */
6496         bi = dev->blockInfo;
6497         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6498                 yaffs_ClearChunkBits(dev, blk);
6499                 bi->pagesInUse = 0;
6500                 bi->softDeletions = 0;
6501
6502                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6503
6504                 bi->blockState = state;
6505                 bi->sequenceNumber = sequenceNumber;
6506
6507                 if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6508                         bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6509                 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6510                         bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6511
6512                 T(YAFFS_TRACE_SCAN_DEBUG,
6513                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6514                    state, sequenceNumber));
6515
6516
6517                 if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
6518                         dev->blocksInCheckpoint++;
6519
6520                 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6521                         T(YAFFS_TRACE_BAD_BLOCKS,
6522                           (TSTR("block %d is bad" TENDSTR), blk));
6523                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6524                         T(YAFFS_TRACE_SCAN_DEBUG,
6525                           (TSTR("Block empty " TENDSTR)));
6526                         dev->nErasedBlocks++;
6527                         dev->nFreeChunks += dev->param.nChunksPerBlock;
6528                 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6529
6530                         /* Determine the highest sequence number */
6531                         if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6532                             sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6533
6534                                 blockIndex[nBlocksToScan].seq = sequenceNumber;
6535                                 blockIndex[nBlocksToScan].block = blk;
6536
6537                                 nBlocksToScan++;
6538
6539                                 if (sequenceNumber >= dev->sequenceNumber)
6540                                         dev->sequenceNumber = sequenceNumber;
6541                         } else {
6542                                 /* TODO: Nasty sequence number! */
6543                                 T(YAFFS_TRACE_SCAN,
6544                                   (TSTR
6545                                    ("Block scanning block %d has bad sequence number %d"
6546                                     TENDSTR), blk, sequenceNumber));
6547
6548                         }
6549                 }
6550                 bi++;
6551         }
6552
6553         T(YAFFS_TRACE_SCAN,
6554         (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6555
6556
6557
6558         YYIELD();
6559
6560         /* Sort the blocks */
6561 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6562         {
6563                 /* Use qsort now. */
6564                 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6565         }
6566 #else
6567         {
6568                 /* Dungy old bubble sort... */
6569
6570                 yaffs_BlockIndex temp;
6571                 int i;
6572                 int j;
6573
6574                 for (i = 0; i < nBlocksToScan; i++)
6575                         for (j = i + 1; j < nBlocksToScan; j++)
6576                                 if (blockIndex[i].seq > blockIndex[j].seq) {
6577                                         temp = blockIndex[j];
6578                                         blockIndex[j] = blockIndex[i];
6579                                         blockIndex[i] = temp;
6580                                 }
6581         }
6582 #endif
6583
6584         YYIELD();
6585
6586         T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6587
6588         /* Now scan the blocks looking at the data. */
6589         startIterator = 0;
6590         endIterator = nBlocksToScan - 1;
6591         T(YAFFS_TRACE_SCAN_DEBUG,
6592           (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6593
6594         /* For each block.... backwards */
6595         for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6596                         blockIterator--) {
6597                 /* Cooperative multitasking! This loop can run for so
6598                    long that watchdog timers expire. */
6599                 YYIELD();
6600
6601                 /* get the block to scan in the correct order */
6602                 blk = blockIndex[blockIterator].block;
6603
6604                 bi = yaffs_GetBlockInfo(dev, blk);
6605
6606
6607                 state = bi->blockState;
6608
6609                 deleted = 0;
6610
6611                 /* For each chunk in each block that needs scanning.... */
6612                 foundChunksInBlock = 0;
6613                 for (c = dev->param.nChunksPerBlock - 1;
6614                      !alloc_failed && c >= 0 &&
6615                      (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6616                       state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6617                         /* Scan backwards...
6618                          * Read the tags and decide what to do
6619                          */
6620
6621                         chunk = blk * dev->param.nChunksPerBlock + c;
6622
6623                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6624                                                         &tags);
6625
6626                         /* Let's have a good look at this chunk... */
6627
6628                         if (!tags.chunkUsed) {
6629                                 /* An unassigned chunk in the block.
6630                                  * If there are used chunks after this one, then
6631                                  * it is a chunk that was skipped due to failing the erased
6632                                  * check. Just skip it so that it can be deleted.
6633                                  * But, more typically, We get here when this is an unallocated
6634                                  * chunk and his means that either the block is empty or
6635                                  * this is the one being allocated from
6636                                  */
6637
6638                                 if (foundChunksInBlock) {
6639                                         /* This is a chunk that was skipped due to failing the erased check */
6640                                 } else if (c == 0) {
6641                                         /* We're looking at the first chunk in the block so the block is unused */
6642                                         state = YAFFS_BLOCK_STATE_EMPTY;
6643                                         dev->nErasedBlocks++;
6644                                 } else {
6645                                         if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6646                                             state == YAFFS_BLOCK_STATE_ALLOCATING) {
6647                                                 if (dev->sequenceNumber == bi->sequenceNumber) {
6648                                                         /* this is the block being allocated from */
6649
6650                                                         T(YAFFS_TRACE_SCAN,
6651                                                           (TSTR
6652                                                            (" Allocating from %d %d"
6653                                                             TENDSTR), blk, c));
6654
6655                                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
6656                                                         dev->allocationBlock = blk;
6657                                                         dev->allocationPage = c;
6658                                                         dev->allocationBlockFinder = blk;
6659                                                 } else {
6660                                                         /* This is a partially written block that is not
6661                                                          * the current allocation block.
6662                                                          */
6663
6664                                                          T(YAFFS_TRACE_ALWAYS,
6665                                                          (TSTR("Partially written block %d detected" TENDSTR),
6666                                                          blk));
6667                                                 }
6668                                         }
6669                                 }
6670
6671                                 dev->nFreeChunks++;
6672
6673                         } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
6674                                 T(YAFFS_TRACE_SCAN,
6675                                   (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
6676                                   blk, c));
6677
6678                                   dev->nFreeChunks++;
6679
6680                         } else if (tags.chunkId > 0) {
6681                                 /* chunkId > 0 so it is a data chunk... */
6682                                 unsigned int endpos;
6683                                 __u32 chunkBase =
6684                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6685
6686                                 foundChunksInBlock = 1;
6687
6688
6689                                 yaffs_SetChunkBit(dev, blk, c);
6690                                 bi->pagesInUse++;
6691
6692                                 in = yaffs_FindOrCreateObjectByNumber(dev,
6693                                                                       tags.
6694                                                                       objectId,
6695                                                                       YAFFS_OBJECT_TYPE_FILE);
6696                                 if (!in) {
6697                                         /* Out of memory */
6698                                         alloc_failed = 1;
6699                                 }
6700
6701                                 if (in &&
6702                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
6703                                     && chunkBase < in->variant.fileVariant.shrinkSize) {
6704                                         /* This has not been invalidated by a resize */
6705                                         if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, -1)) {
6706                                                 alloc_failed = 1;
6707                                         }
6708
6709                                         /* File size is calculated by looking at the data chunks if we have not
6710                                          * seen an object header yet. Stop this practice once we find an object header.
6711                                          */
6712                                         endpos = chunkBase + tags.byteCount;
6713
6714                                         if (!in->valid &&       /* have not got an object header yet */
6715                                             in->variant.fileVariant.scannedFileSize < endpos) {
6716                                                 in->variant.fileVariant.scannedFileSize = endpos;
6717                                                 in->variant.fileVariant.fileSize = endpos;
6718                                         }
6719
6720                                 } else if (in) {
6721                                         /* This chunk has been invalidated by a resize, or a past file deletion
6722                                          * so delete the chunk*/
6723                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6724
6725                                 }
6726                         } else {
6727                                 /* chunkId == 0, so it is an ObjectHeader.
6728                                  * Thus, we read in the object header and make the object
6729                                  */
6730                                 foundChunksInBlock = 1;
6731
6732                                 yaffs_SetChunkBit(dev, blk, c);
6733                                 bi->pagesInUse++;
6734
6735                                 oh = NULL;
6736                                 in = NULL;
6737
6738                                 if (tags.extraHeaderInfoAvailable) {
6739                                         in = yaffs_FindOrCreateObjectByNumber(dev,
6740                                                 tags.objectId,
6741                                                 tags.extraObjectType);
6742                                         if (!in)
6743                                                 alloc_failed = 1;
6744                                 }
6745
6746                                 if (!in ||
6747                                     (!in->valid && dev->param.disableLazyLoad) ||
6748                                     tags.extraShadows ||
6749                                     (!in->valid &&
6750                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6751                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
6752
6753                                         /* If we don't have  valid info then we need to read the chunk
6754                                          * TODO In future we can probably defer reading the chunk and
6755                                          * living with invalid data until needed.
6756                                          */
6757
6758                                         result = yaffs_ReadChunkWithTagsFromNAND(dev,
6759                                                                         chunk,
6760                                                                         chunkData,
6761                                                                         NULL);
6762
6763                                         oh = (yaffs_ObjectHeader *) chunkData;
6764
6765                                         if (dev->param.inbandTags) {
6766                                                 /* Fix up the header if they got corrupted by inband tags */
6767                                                 oh->shadowsObject = oh->inbandShadowsObject;
6768                                                 oh->isShrink = oh->inbandIsShrink;
6769                                         }
6770
6771                                         if (!in) {
6772                                                 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6773                                                 if (!in)
6774                                                         alloc_failed = 1;
6775                                         }
6776
6777                                 }
6778
6779                                 if (!in) {
6780                                         /* TODO Hoosterman we have a problem! */
6781                                         T(YAFFS_TRACE_ERROR,
6782                                           (TSTR
6783                                            ("yaffs tragedy: Could not make object for object  %d at chunk %d during scan"
6784                                             TENDSTR), tags.objectId, chunk));
6785                                         continue;
6786                                 }
6787
6788                                 if (in->valid) {
6789                                         /* We have already filled this one.
6790                                          * We have a duplicate that will be discarded, but
6791                                          * we first have to suck out resize info if it is a file.
6792                                          */
6793
6794                                         if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6795                                              ((oh &&
6796                                                oh->type == YAFFS_OBJECT_TYPE_FILE) ||
6797                                               (tags.extraHeaderInfoAvailable  &&
6798                                                tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
6799                                                 __u32 thisSize =
6800                                                     (oh) ? oh->fileSize : tags.
6801                                                     extraFileLength;
6802                                                 __u32 parentObjectId =
6803                                                     (oh) ? oh->
6804                                                     parentObjectId : tags.
6805                                                     extraParentObjectId;
6806
6807
6808                                                 isShrink =
6809                                                     (oh) ? oh->isShrink : tags.
6810                                                     extraIsShrinkHeader;
6811
6812                                                 /* If it is deleted (unlinked at start also means deleted)
6813                                                  * we treat the file size as being zeroed at this point.
6814                                                  */
6815                                                 if (parentObjectId ==
6816                                                     YAFFS_OBJECTID_DELETED
6817                                                     || parentObjectId ==
6818                                                     YAFFS_OBJECTID_UNLINKED) {
6819                                                         thisSize = 0;
6820                                                         isShrink = 1;
6821                                                 }
6822
6823                                                 if (isShrink && in->variant.fileVariant.shrinkSize > thisSize)
6824                                                         in->variant.fileVariant.shrinkSize = thisSize;
6825
6826                                                 if (isShrink)
6827                                                         bi->hasShrinkHeader = 1;
6828
6829                                         }
6830                                         /* Use existing - destroy this one. */
6831                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6832
6833                                 }
6834
6835                                 if (!in->valid && in->variantType !=
6836                                     (oh ? oh->type : tags.extraObjectType))
6837                                         T(YAFFS_TRACE_ERROR, (
6838                                                 TSTR("yaffs tragedy: Bad object type, "
6839                                             TCONT("%d != %d, for object %d at chunk ")
6840                                             TCONT("%d during scan")
6841                                                 TENDSTR), oh ?
6842                                             oh->type : tags.extraObjectType,
6843                                             in->variantType, tags.objectId,
6844                                             chunk));
6845
6846                                 if (!in->valid &&
6847                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6848                                      tags.objectId ==
6849                                      YAFFS_OBJECTID_LOSTNFOUND)) {
6850                                         /* We only load some info, don't fiddle with directory structure */
6851                                         in->valid = 1;
6852
6853                                         if (oh) {
6854                                                 in->variantType = oh->type;
6855
6856                                                 in->yst_mode = oh->yst_mode;
6857 #ifdef CONFIG_YAFFS_WINCE
6858                                                 in->win_atime[0] = oh->win_atime[0];
6859                                                 in->win_ctime[0] = oh->win_ctime[0];
6860                                                 in->win_mtime[0] = oh->win_mtime[0];
6861                                                 in->win_atime[1] = oh->win_atime[1];
6862                                                 in->win_ctime[1] = oh->win_ctime[1];
6863                                                 in->win_mtime[1] = oh->win_mtime[1];
6864 #else
6865                                                 in->yst_uid = oh->yst_uid;
6866                                                 in->yst_gid = oh->yst_gid;
6867                                                 in->yst_atime = oh->yst_atime;
6868                                                 in->yst_mtime = oh->yst_mtime;
6869                                                 in->yst_ctime = oh->yst_ctime;
6870                                                 in->yst_rdev = oh->yst_rdev;
6871
6872 #endif
6873                                         } else {
6874                                                 in->variantType = tags.extraObjectType;
6875                                                 in->lazyLoaded = 1;
6876                                         }
6877
6878                                         in->hdrChunk = chunk;
6879
6880                                 } else if (!in->valid) {
6881                                         /* we need to load this info */
6882
6883                                         in->valid = 1;
6884                                         in->hdrChunk = chunk;
6885
6886                                         if (oh) {
6887                                                 in->variantType = oh->type;
6888
6889                                                 in->yst_mode = oh->yst_mode;
6890 #ifdef CONFIG_YAFFS_WINCE
6891                                                 in->win_atime[0] = oh->win_atime[0];
6892                                                 in->win_ctime[0] = oh->win_ctime[0];
6893                                                 in->win_mtime[0] = oh->win_mtime[0];
6894                                                 in->win_atime[1] = oh->win_atime[1];
6895                                                 in->win_ctime[1] = oh->win_ctime[1];
6896                                                 in->win_mtime[1] = oh->win_mtime[1];
6897 #else
6898                                                 in->yst_uid = oh->yst_uid;
6899                                                 in->yst_gid = oh->yst_gid;
6900                                                 in->yst_atime = oh->yst_atime;
6901                                                 in->yst_mtime = oh->yst_mtime;
6902                                                 in->yst_ctime = oh->yst_ctime;
6903                                                 in->yst_rdev = oh->yst_rdev;
6904 #endif
6905
6906                                                 if (oh->shadowsObject > 0)
6907                                                         yaffs_HandleShadowedObject(dev,
6908                                                                            oh->
6909                                                                            shadowsObject,
6910                                                                            1);
6911
6912
6913
6914                                                 yaffs_SetObjectName(in, oh->name);
6915                                                 parent =
6916                                                     yaffs_FindOrCreateObjectByNumber
6917                                                         (dev, oh->parentObjectId,
6918                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6919
6920                                                  fileSize = oh->fileSize;
6921                                                  isShrink = oh->isShrink;
6922                                                  equivalentObjectId = oh->equivalentObjectId;
6923
6924                                         } else {
6925                                                 in->variantType = tags.extraObjectType;
6926                                                 parent =
6927                                                     yaffs_FindOrCreateObjectByNumber
6928                                                         (dev, tags.extraParentObjectId,
6929                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6930                                                  fileSize = tags.extraFileLength;
6931                                                  isShrink = tags.extraIsShrinkHeader;
6932                                                  equivalentObjectId = tags.extraEquivalentObjectId;
6933                                                 in->lazyLoaded = 1;
6934
6935                                         }
6936                                         in->dirty = 0;
6937
6938                                         if (!parent)
6939                                                 alloc_failed = 1;
6940
6941                                         /* directory stuff...
6942                                          * hook up to parent
6943                                          */
6944
6945                                         if (parent && parent->variantType ==
6946                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
6947                                                 /* Set up as a directory */
6948                                                 parent->variantType =
6949                                                         YAFFS_OBJECT_TYPE_DIRECTORY;
6950                                                 YINIT_LIST_HEAD(&parent->variant.
6951                                                         directoryVariant.
6952                                                         children);
6953                                         } else if (!parent || parent->variantType !=
6954                                                    YAFFS_OBJECT_TYPE_DIRECTORY) {
6955                                                 /* Hoosterman, another problem....
6956                                                  * We're trying to use a non-directory as a directory
6957                                                  */
6958
6959                                                 T(YAFFS_TRACE_ERROR,
6960                                                   (TSTR
6961                                                    ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6962                                                     TENDSTR)));
6963                                                 parent = dev->lostNFoundDir;
6964                                         }
6965
6966                                         yaffs_AddObjectToDirectory(parent, in);
6967
6968                                         itsUnlinked = (parent == dev->deletedDir) ||
6969                                                       (parent == dev->unlinkedDir);
6970
6971                                         if (isShrink) {
6972                                                 /* Mark the block as having a shrinkHeader */
6973                                                 bi->hasShrinkHeader = 1;
6974                                         }
6975
6976                                         /* Note re hardlinks.
6977                                          * Since we might scan a hardlink before its equivalent object is scanned
6978                                          * we put them all in a list.
6979                                          * After scanning is complete, we should have all the objects, so we run
6980                                          * through this list and fix up all the chains.
6981                                          */
6982
6983                                         switch (in->variantType) {
6984                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
6985                                                 /* Todo got a problem */
6986                                                 break;
6987                                         case YAFFS_OBJECT_TYPE_FILE:
6988
6989                                                 if (in->variant.fileVariant.
6990                                                     scannedFileSize < fileSize) {
6991                                                         /* This covers the case where the file size is greater
6992                                                          * than where the data is
6993                                                          * This will happen if the file is resized to be larger
6994                                                          * than its current data extents.
6995                                                          */
6996                                                         in->variant.fileVariant.fileSize = fileSize;
6997                                                         in->variant.fileVariant.scannedFileSize = fileSize;
6998                                                 }
6999
7000                                                 if (in->variant.fileVariant.shrinkSize > fileSize)
7001                                                         in->variant.fileVariant.shrinkSize = fileSize;
7002
7003
7004                                                 break;
7005                                         case YAFFS_OBJECT_TYPE_HARDLINK:
7006                                                 if (!itsUnlinked) {
7007                                                         in->variant.hardLinkVariant.equivalentObjectId =
7008                                                                 equivalentObjectId;
7009                                                         in->hardLinks.next =
7010                                                                 (struct ylist_head *) hardList;
7011                                                         hardList = in;
7012                                                 }
7013                                                 break;
7014                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
7015                                                 /* Do nothing */
7016                                                 break;
7017                                         case YAFFS_OBJECT_TYPE_SPECIAL:
7018                                                 /* Do nothing */
7019                                                 break;
7020                                         case YAFFS_OBJECT_TYPE_SYMLINK:
7021                                                 if (oh) {
7022                                                         in->variant.symLinkVariant.alias =
7023                                                                 yaffs_CloneString(oh->alias);
7024                                                         if (!in->variant.symLinkVariant.alias)
7025                                                                 alloc_failed = 1;
7026                                                 }
7027                                                 break;
7028                                         }
7029
7030                                 }
7031
7032                         }
7033
7034                 } /* End of scanning for each chunk */
7035
7036                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
7037                         /* If we got this far while scanning, then the block is fully allocated. */
7038                         state = YAFFS_BLOCK_STATE_FULL;
7039                 }
7040
7041
7042                 bi->blockState = state;
7043
7044                 /* Now let's see if it was dirty */
7045                 if (bi->pagesInUse == 0 &&
7046                     !bi->hasShrinkHeader &&
7047                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
7048                         yaffs_BlockBecameDirty(dev, blk);
7049                 }
7050
7051         }
7052
7053         yaffs_SkipRestOfBlock(dev);
7054
7055         if (altBlockIndex)
7056                 YFREE_ALT(blockIndex);
7057         else
7058                 YFREE(blockIndex);
7059
7060         /* Ok, we've done all the scanning.
7061          * Fix up the hard link chains.
7062          * We should now have scanned all the objects, now it's time to add these
7063          * hardlinks.
7064          */
7065         yaffs_HardlinkFixup(dev, hardList);
7066
7067
7068         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
7069
7070         if (alloc_failed)
7071                 return YAFFS_FAIL;
7072
7073         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
7074
7075         return YAFFS_OK;
7076 }
7077
7078 /*------------------------------  Directory Functions ----------------------------- */
7079
7080 static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
7081 {
7082         struct ylist_head *lh;
7083         yaffs_Object *listObj;
7084
7085         int count = 0;
7086
7087         if (!obj) {
7088                 T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
7089                 YBUG();
7090                 return;
7091         }
7092
7093         if (yaffs_SkipVerification(obj->myDev))
7094                 return;
7095
7096         if (!obj->parent) {
7097                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
7098                 YBUG();
7099                 return;
7100         }
7101
7102         if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7103                 T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
7104                 YBUG();
7105         }
7106
7107         /* Iterate through the objects in each hash entry */
7108
7109         ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
7110                 if (lh) {
7111                         listObj = ylist_entry(lh, yaffs_Object, siblings);
7112                         yaffs_VerifyObject(listObj);
7113                         if (obj == listObj)
7114                                 count++;
7115                 }
7116          }
7117
7118         if (count != 1) {
7119                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
7120                 YBUG();
7121         }
7122 }
7123
7124 static void yaffs_VerifyDirectory(yaffs_Object *directory)
7125 {
7126         struct ylist_head *lh;
7127         yaffs_Object *listObj;
7128
7129         if (!directory) {
7130                 YBUG();
7131                 return;
7132         }
7133
7134         if (yaffs_SkipFullVerification(directory->myDev))
7135                 return;
7136
7137         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7138                 T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
7139                 YBUG();
7140         }
7141
7142         /* Iterate through the objects in each hash entry */
7143
7144         ylist_for_each(lh, &directory->variant.directoryVariant.children) {
7145                 if (lh) {
7146                         listObj = ylist_entry(lh, yaffs_Object, siblings);
7147                         if (listObj->parent != directory) {
7148                                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
7149                                 YBUG();
7150                         }
7151                         yaffs_VerifyObjectInDirectory(listObj);
7152                 }
7153         }
7154 }
7155
7156 /*
7157  *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
7158  * link (ie. name) is created or deleted in the directory.
7159  *
7160  * ie.
7161  *   create dir/a : update dir's mtime/ctime
7162  *   rm dir/a:   update dir's mtime/ctime
7163  *   modify dir/a: don't update dir's mtimme/ctime
7164  *
7165  * This can be handled immediately or defered. Defering helps reduce the number
7166  * of updates when many files in a directory are changed within a brief period.
7167  *
7168  * If the directory updating is defered then yaffs_UpdateDirtyDirecories must be
7169  * called periodically.
7170  */
7171
7172 static void yaffs_UpdateParent(yaffs_Object *obj)
7173 {
7174         yaffs_Device *dev;
7175         if(!obj)
7176                 return;
7177
7178         dev = obj->myDev;
7179         obj->dirty = 1;
7180         obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
7181         if(dev->param.deferDirectoryUpdate){
7182                 struct ylist_head *link = &obj->variant.directoryVariant.dirty;
7183
7184                 if(ylist_empty(link)){
7185                         ylist_add(link,&dev->dirtyDirectories);
7186                         T(YAFFS_TRACE_BACKGROUND, (TSTR("Added object %d to dirty directories" TENDSTR),obj->objectId));
7187                 }
7188
7189         } else
7190                 yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
7191 }
7192
7193 void yaffs_UpdateDirtyDirectories(yaffs_Device *dev)
7194 {
7195         struct ylist_head *link;
7196         yaffs_Object *obj;
7197         yaffs_DirectoryStructure *dS;
7198         yaffs_ObjectVariant *oV;
7199
7200         T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR)));
7201
7202         while(!ylist_empty(&dev->dirtyDirectories)){
7203                 link = dev->dirtyDirectories.next;
7204                 ylist_del_init(link);
7205
7206                 dS=ylist_entry(link,yaffs_DirectoryStructure,dirty);
7207                 oV = ylist_entry(dS,yaffs_ObjectVariant,directoryVariant);
7208                 obj = ylist_entry(oV,yaffs_Object,variant);
7209
7210                 T(YAFFS_TRACE_BACKGROUND, (TSTR("Update directory %d" TENDSTR), obj->objectId));
7211
7212                 if(obj->dirty)
7213                         yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
7214         }
7215 }
7216
7217 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
7218 {
7219         yaffs_Device *dev = obj->myDev;
7220         yaffs_Object *parent;
7221
7222         yaffs_VerifyObjectInDirectory(obj);
7223         parent = obj->parent;
7224
7225         yaffs_VerifyDirectory(parent);
7226
7227         if (dev && dev->param.removeObjectCallback)
7228                 dev->param.removeObjectCallback(obj);
7229
7230
7231         ylist_del_init(&obj->siblings);
7232         obj->parent = NULL;
7233
7234         yaffs_VerifyDirectory(parent);
7235 }
7236
7237 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
7238                                         yaffs_Object *obj)
7239 {
7240         if (!directory) {
7241                 T(YAFFS_TRACE_ALWAYS,
7242                   (TSTR
7243                    ("tragedy: Trying to add an object to a null pointer directory"
7244                     TENDSTR)));
7245                 YBUG();
7246                 return;
7247         }
7248         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7249                 T(YAFFS_TRACE_ALWAYS,
7250                   (TSTR
7251                    ("tragedy: Trying to add an object to a non-directory"
7252                     TENDSTR)));
7253                 YBUG();
7254         }
7255
7256         if (obj->siblings.prev == NULL) {
7257                 /* Not initialised */
7258                 YBUG();
7259         }
7260
7261
7262         yaffs_VerifyDirectory(directory);
7263
7264         yaffs_RemoveObjectFromDirectory(obj);
7265
7266
7267         /* Now add it */
7268         ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
7269         obj->parent = directory;
7270
7271         if (directory == obj->myDev->unlinkedDir
7272                         || directory == obj->myDev->deletedDir) {
7273                 obj->unlinked = 1;
7274                 obj->myDev->nUnlinkedFiles++;
7275                 obj->renameAllowed = 0;
7276         }
7277
7278         yaffs_VerifyDirectory(directory);
7279         yaffs_VerifyObjectInDirectory(obj);
7280 }
7281
7282 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
7283                                      const YCHAR *name)
7284 {
7285         int sum;
7286
7287         struct ylist_head *i;
7288         YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
7289
7290         yaffs_Object *l;
7291
7292         if (!name)
7293                 return NULL;
7294
7295         if (!directory) {
7296                 T(YAFFS_TRACE_ALWAYS,
7297                   (TSTR
7298                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
7299                     TENDSTR)));
7300                 YBUG();
7301                 return NULL;
7302         }
7303         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7304                 T(YAFFS_TRACE_ALWAYS,
7305                   (TSTR
7306                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7307                 YBUG();
7308         }
7309
7310         sum = yaffs_CalcNameSum(name);
7311
7312         ylist_for_each(i, &directory->variant.directoryVariant.children) {
7313                 if (i) {
7314                         l = ylist_entry(i, yaffs_Object, siblings);
7315
7316                         if (l->parent != directory)
7317                                 YBUG();
7318
7319                         yaffs_CheckObjectDetailsLoaded(l);
7320
7321                         /* Special case for lost-n-found */
7322                         if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7323                                 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
7324                                         return l;
7325                         } else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
7326                                 /* LostnFound chunk called Objxxx
7327                                  * Do a real check
7328                                  */
7329                                 yaffs_GetObjectName(l, buffer,
7330                                                     YAFFS_MAX_NAME_LENGTH + 1);
7331                                 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
7332                                         return l;
7333                         }
7334                 }
7335         }
7336
7337         return NULL;
7338 }
7339
7340
7341 #if 0
7342 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
7343                                         int (*fn) (yaffs_Object *))
7344 {
7345         struct ylist_head *i;
7346         yaffs_Object *l;
7347
7348         if (!theDir) {
7349                 T(YAFFS_TRACE_ALWAYS,
7350                   (TSTR
7351                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
7352                     TENDSTR)));
7353                 YBUG();
7354                 return YAFFS_FAIL;
7355         }
7356         if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7357                 T(YAFFS_TRACE_ALWAYS,
7358                   (TSTR
7359                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7360                 YBUG();
7361                 return YAFFS_FAIL;
7362         }
7363
7364         ylist_for_each(i, &theDir->variant.directoryVariant.children) {
7365                 if (i) {
7366                         l = ylist_entry(i, yaffs_Object, siblings);
7367                         if (l && !fn(l))
7368                                 return YAFFS_FAIL;
7369                 }
7370         }
7371
7372         return YAFFS_OK;
7373
7374 }
7375 #endif
7376
7377 /* GetEquivalentObject dereferences any hard links to get to the
7378  * actual object.
7379  */
7380
7381 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
7382 {
7383         if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
7384                 /* We want the object id of the equivalent object, not this one */
7385                 obj = obj->variant.hardLinkVariant.equivalentObject;
7386                 yaffs_CheckObjectDetailsLoaded(obj);
7387         }
7388         return obj;
7389 }
7390
7391 int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
7392 {
7393         memset(name, 0, buffSize * sizeof(YCHAR));
7394
7395         yaffs_CheckObjectDetailsLoaded(obj);
7396
7397         if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7398                 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
7399         } else if (obj->hdrChunk <= 0) {
7400                 YCHAR locName[20];
7401                 YCHAR numString[20];
7402                 YCHAR *x = &numString[19];
7403                 unsigned v = obj->objectId;
7404                 numString[19] = 0;
7405                 while (v > 0) {
7406                         x--;
7407                         *x = '0' + (v % 10);
7408                         v /= 10;
7409                 }
7410                 /* make up a name */
7411                 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
7412                 yaffs_strcat(locName, x);
7413                 yaffs_strncpy(name, locName, buffSize - 1);
7414
7415         }
7416 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
7417         else if (obj->shortName[0])
7418                 yaffs_strncpy(name, obj->shortName,YAFFS_SHORT_NAME_LENGTH+1);
7419 #endif
7420         else {
7421                 int result;
7422                 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
7423
7424                 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
7425
7426                 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
7427
7428                 if (obj->hdrChunk > 0) {
7429                         result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
7430                                                         obj->hdrChunk, buffer,
7431                                                         NULL);
7432                 }
7433                 yaffs_strncpy(name, oh->name, buffSize - 1);
7434                 name[buffSize-1]=0;
7435
7436                 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
7437         }
7438
7439         return yaffs_strnlen(name,buffSize-1);
7440 }
7441
7442 int yaffs_GetObjectFileLength(yaffs_Object *obj)
7443 {
7444         /* Dereference any hard linking */
7445         obj = yaffs_GetEquivalentObject(obj);
7446
7447         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
7448                 return obj->variant.fileVariant.fileSize;
7449         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
7450                 if(!obj->variant.symLinkVariant.alias)
7451                         return 0;
7452                 return yaffs_strnlen(obj->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
7453         } else {
7454                 /* Only a directory should drop through to here */
7455                 return obj->myDev->nDataBytesPerChunk;
7456         }
7457 }
7458
7459 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
7460 {
7461         int count = 0;
7462         struct ylist_head *i;
7463
7464         if (!obj->unlinked)
7465                 count++;                /* the object itself */
7466
7467         ylist_for_each(i, &obj->hardLinks)
7468                 count++;                /* add the hard links; */
7469
7470         return count;
7471 }
7472
7473 int yaffs_GetObjectInode(yaffs_Object *obj)
7474 {
7475         obj = yaffs_GetEquivalentObject(obj);
7476
7477         return obj->objectId;
7478 }
7479
7480 unsigned yaffs_GetObjectType(yaffs_Object *obj)
7481 {
7482         obj = yaffs_GetEquivalentObject(obj);
7483
7484         switch (obj->variantType) {
7485         case YAFFS_OBJECT_TYPE_FILE:
7486                 return DT_REG;
7487                 break;
7488         case YAFFS_OBJECT_TYPE_DIRECTORY:
7489                 return DT_DIR;
7490                 break;
7491         case YAFFS_OBJECT_TYPE_SYMLINK:
7492                 return DT_LNK;
7493                 break;
7494         case YAFFS_OBJECT_TYPE_HARDLINK:
7495                 return DT_REG;
7496                 break;
7497         case YAFFS_OBJECT_TYPE_SPECIAL:
7498                 if (S_ISFIFO(obj->yst_mode))
7499                         return DT_FIFO;
7500                 if (S_ISCHR(obj->yst_mode))
7501                         return DT_CHR;
7502                 if (S_ISBLK(obj->yst_mode))
7503                         return DT_BLK;
7504                 if (S_ISSOCK(obj->yst_mode))
7505                         return DT_SOCK;
7506         default:
7507                 return DT_REG;
7508                 break;
7509         }
7510 }
7511
7512 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
7513 {
7514         obj = yaffs_GetEquivalentObject(obj);
7515         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
7516                 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
7517         else
7518                 return yaffs_CloneString(_Y(""));
7519 }
7520
7521 #ifndef CONFIG_YAFFS_WINCE
7522
7523 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
7524 {
7525         unsigned int valid = attr->ia_valid;
7526
7527         if (valid & ATTR_MODE)
7528                 obj->yst_mode = attr->ia_mode;
7529         if (valid & ATTR_UID)
7530                 obj->yst_uid = attr->ia_uid;
7531         if (valid & ATTR_GID)
7532                 obj->yst_gid = attr->ia_gid;
7533
7534         if (valid & ATTR_ATIME)
7535                 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
7536         if (valid & ATTR_CTIME)
7537                 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
7538         if (valid & ATTR_MTIME)
7539                 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
7540
7541         if (valid & ATTR_SIZE)
7542                 yaffs_ResizeFile(obj, attr->ia_size);
7543
7544         yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
7545
7546         return YAFFS_OK;
7547
7548 }
7549 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
7550 {
7551         unsigned int valid = 0;
7552
7553         attr->ia_mode = obj->yst_mode;
7554         valid |= ATTR_MODE;
7555         attr->ia_uid = obj->yst_uid;
7556         valid |= ATTR_UID;
7557         attr->ia_gid = obj->yst_gid;
7558         valid |= ATTR_GID;
7559
7560         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
7561         valid |= ATTR_ATIME;
7562         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
7563         valid |= ATTR_CTIME;
7564         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
7565         valid |= ATTR_MTIME;
7566
7567         attr->ia_size = yaffs_GetFileSize(obj);
7568         valid |= ATTR_SIZE;
7569
7570         attr->ia_valid = valid;
7571
7572         return YAFFS_OK;
7573 }
7574
7575 #endif
7576
7577 #if 0
7578 int yaffs_DumpObject(yaffs_Object *obj)
7579 {
7580         YCHAR name[257];
7581
7582         yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
7583
7584         T(YAFFS_TRACE_ALWAYS,
7585           (TSTR
7586            ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
7587             " chunk %d type %d size %d\n"
7588             TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
7589            obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
7590            yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
7591
7592         return YAFFS_OK;
7593 }
7594 #endif
7595
7596 /*---------------------------- Initialisation code -------------------------------------- */
7597
7598 static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
7599 {
7600
7601         /* Common functions, gotta have */
7602         if (!dev->param.eraseBlockInNAND || !dev->param.initialiseNAND)
7603                 return 0;
7604
7605 #ifdef CONFIG_YAFFS_YAFFS2
7606
7607         /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
7608         if (dev->param.writeChunkWithTagsToNAND &&
7609             dev->param.readChunkWithTagsFromNAND &&
7610             !dev->param.writeChunkToNAND &&
7611             !dev->param.readChunkFromNAND &&
7612             dev->param.markNANDBlockBad &&
7613             dev->param.queryNANDBlock)
7614                 return 1;
7615 #endif
7616
7617         /* Can use the "spare" style interface for yaffs1 */
7618         if (!dev->param.isYaffs2 &&
7619             !dev->param.writeChunkWithTagsToNAND &&
7620             !dev->param.readChunkWithTagsFromNAND &&
7621             dev->param.writeChunkToNAND &&
7622             dev->param.readChunkFromNAND &&
7623             !dev->param.markNANDBlockBad &&
7624             !dev->param.queryNANDBlock)
7625                 return 1;
7626
7627         return 0;       /* bad */
7628 }
7629
7630
7631 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7632 {
7633         /* Initialise the unlinked, deleted, root and lost and found directories */
7634
7635         dev->lostNFoundDir = dev->rootDir =  NULL;
7636         dev->unlinkedDir = dev->deletedDir = NULL;
7637
7638         dev->unlinkedDir =
7639             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7640
7641         dev->deletedDir =
7642             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7643
7644         dev->rootDir =
7645             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7646                                       YAFFS_ROOT_MODE | S_IFDIR);
7647         dev->lostNFoundDir =
7648             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7649                                       YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7650
7651         if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
7652                 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7653                 return YAFFS_OK;
7654         }
7655
7656         return YAFFS_FAIL;
7657 }
7658
7659 int yaffs_GutsInitialise(yaffs_Device *dev)
7660 {
7661         int init_failed = 0;
7662         unsigned x;
7663         int bits;
7664
7665         T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7666
7667         /* Check stuff that must be set */
7668
7669         if (!dev) {
7670                 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7671                 return YAFFS_FAIL;
7672         }
7673
7674         dev->internalStartBlock = dev->param.startBlock;
7675         dev->internalEndBlock = dev->param.endBlock;
7676         dev->blockOffset = 0;
7677         dev->chunkOffset = 0;
7678         dev->nFreeChunks = 0;
7679
7680         dev->gcBlock = -1;
7681
7682         if (dev->param.startBlock == 0) {
7683                 dev->internalStartBlock = dev->param.startBlock + 1;
7684                 dev->internalEndBlock = dev->param.endBlock + 1;
7685                 dev->blockOffset = 1;
7686                 dev->chunkOffset = dev->param.nChunksPerBlock;
7687         }
7688
7689         /* Check geometry parameters. */
7690
7691         if ((!dev->param.inbandTags && dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 1024) ||
7692             (!dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 512) ||
7693             (dev->param.inbandTags && !dev->param.isYaffs2) ||
7694              dev->param.nChunksPerBlock < 2 ||
7695              dev->param.nReservedBlocks < 2 ||
7696              dev->internalStartBlock <= 0 ||
7697              dev->internalEndBlock <= 0 ||
7698              dev->internalEndBlock <= (dev->internalStartBlock + dev->param.nReservedBlocks + 2)) {     /* otherwise it is too small */
7699                 T(YAFFS_TRACE_ALWAYS,
7700                   (TSTR
7701                    ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
7702                     TENDSTR), dev->param.totalBytesPerChunk, dev->param.isYaffs2 ? "2" : "", dev->param.inbandTags));
7703                 return YAFFS_FAIL;
7704         }
7705
7706         if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7707                 T(YAFFS_TRACE_ALWAYS,
7708                   (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7709                 return YAFFS_FAIL;
7710         }
7711
7712         /* Sort out space for inband tags, if required */
7713         if (dev->param.inbandTags)
7714                 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
7715         else
7716                 dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk;
7717
7718         /* Got the right mix of functions? */
7719         if (!yaffs_CheckDevFunctions(dev)) {
7720                 /* Function missing */
7721                 T(YAFFS_TRACE_ALWAYS,
7722                   (TSTR
7723                    ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7724
7725                 return YAFFS_FAIL;
7726         }
7727
7728         /* This is really a compilation check. */
7729         if (!yaffs_CheckStructures()) {
7730                 T(YAFFS_TRACE_ALWAYS,
7731                   (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7732                 return YAFFS_FAIL;
7733         }
7734
7735         if (dev->isMounted) {
7736                 T(YAFFS_TRACE_ALWAYS,
7737                   (TSTR("yaffs: device already mounted\n" TENDSTR)));
7738                 return YAFFS_FAIL;
7739         }
7740
7741         /* Finished with most checks. One or two more checks happen later on too. */
7742
7743         dev->isMounted = 1;
7744
7745         /* OK now calculate a few things for the device */
7746
7747         /*
7748          *  Calculate all the chunk size manipulation numbers:
7749          */
7750         x = dev->nDataBytesPerChunk;
7751         /* We always use dev->chunkShift and dev->chunkDiv */
7752         dev->chunkShift = Shifts(x);
7753         x >>= dev->chunkShift;
7754         dev->chunkDiv = x;
7755         /* We only use chunk mask if chunkDiv is 1 */
7756         dev->chunkMask = (1<<dev->chunkShift) - 1;
7757
7758         /*
7759          * Calculate chunkGroupBits.
7760          * We need to find the next power of 2 > than internalEndBlock
7761          */
7762
7763         x = dev->param.nChunksPerBlock * (dev->internalEndBlock + 1);
7764
7765         bits = ShiftsGE(x);
7766
7767         /* Set up tnode width if wide tnodes are enabled. */
7768         if (!dev->param.wideTnodesDisabled) {
7769                 /* bits must be even so that we end up with 32-bit words */
7770                 if (bits & 1)
7771                         bits++;
7772                 if (bits < 16)
7773                         dev->tnodeWidth = 16;
7774                 else
7775                         dev->tnodeWidth = bits;
7776         } else
7777                 dev->tnodeWidth = 16;
7778
7779         dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7780
7781         /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7782          * so if the bitwidth of the
7783          * chunk range we're using is greater than 16 we need
7784          * to figure out chunk shift and chunkGroupSize
7785          */
7786
7787         if (bits <= dev->tnodeWidth)
7788                 dev->chunkGroupBits = 0;
7789         else
7790                 dev->chunkGroupBits = bits - dev->tnodeWidth;
7791
7792
7793         dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7794
7795         if (dev->param.nChunksPerBlock < dev->chunkGroupSize) {
7796                 /* We have a problem because the soft delete won't work if
7797                  * the chunk group size > chunks per block.
7798                  * This can be remedied by using larger "virtual blocks".
7799                  */
7800                 T(YAFFS_TRACE_ALWAYS,
7801                   (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7802
7803                 return YAFFS_FAIL;
7804         }
7805
7806         /* OK, we've finished verifying the device, lets continue with initialisation */
7807
7808         /* More device initialisation */
7809         dev->garbageCollections = 0;
7810         dev->passiveGarbageCollections = 0;
7811         dev->currentDirtyChecker = 0;
7812         dev->bufferedBlock = -1;
7813         dev->doingBufferedBlockRewrite = 0;
7814         dev->nDeletedFiles = 0;
7815         dev->nBackgroundDeletions = 0;
7816         dev->nUnlinkedFiles = 0;
7817         dev->eccFixed = 0;
7818         dev->eccUnfixed = 0;
7819         dev->tagsEccFixed = 0;
7820         dev->tagsEccUnfixed = 0;
7821         dev->nErasureFailures = 0;
7822         dev->nErasedBlocks = 0;
7823         dev->isDoingGC = 0;
7824         dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7825         YINIT_LIST_HEAD(&dev->dirtyDirectories);
7826         dev->oldestDirtySequence = 0;
7827
7828         /* Initialise temporary buffers and caches. */
7829         if (!yaffs_InitialiseTempBuffers(dev))
7830                 init_failed = 1;
7831
7832         dev->srCache = NULL;
7833         dev->gcCleanupList = NULL;
7834
7835
7836         if (!init_failed &&
7837             dev->param.nShortOpCaches > 0) {
7838                 int i;
7839                 void *buf;
7840                 int srCacheBytes = dev->param.nShortOpCaches * sizeof(yaffs_ChunkCache);
7841
7842                 if (dev->param.nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
7843                         dev->param.nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7844
7845                 dev->srCache =  YMALLOC(srCacheBytes);
7846
7847                 buf = (__u8 *) dev->srCache;
7848
7849                 if (dev->srCache)
7850                         memset(dev->srCache, 0, srCacheBytes);
7851
7852                 for (i = 0; i < dev->param.nShortOpCaches && buf; i++) {
7853                         dev->srCache[i].object = NULL;
7854                         dev->srCache[i].lastUse = 0;
7855                         dev->srCache[i].dirty = 0;
7856                         dev->srCache[i].data = buf = YMALLOC_DMA(dev->param.totalBytesPerChunk);
7857                 }
7858                 if (!buf)
7859                         init_failed = 1;
7860
7861                 dev->srLastUse = 0;
7862         }
7863
7864         dev->cacheHits = 0;
7865
7866         if (!init_failed) {
7867                 dev->gcCleanupList = YMALLOC(dev->param.nChunksPerBlock * sizeof(__u32));
7868                 if (!dev->gcCleanupList)
7869                         init_failed = 1;
7870         }
7871
7872         if (dev->param.isYaffs2)
7873                 dev->param.useHeaderFileSize = 1;
7874
7875         if (!init_failed && !yaffs_InitialiseBlocks(dev))
7876                 init_failed = 1;
7877
7878         yaffs_InitialiseTnodes(dev);
7879         yaffs_InitialiseObjects(dev);
7880
7881         if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7882                 init_failed = 1;
7883
7884
7885         if (!init_failed) {
7886                 /* Now scan the flash. */
7887                 if (dev->param.isYaffs2) {
7888                         if (yaffs_CheckpointRestore(dev)) {
7889                                 yaffs_CheckObjectDetailsLoaded(dev->rootDir);
7890                                 T(YAFFS_TRACE_ALWAYS,
7891                                   (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7892                         } else {
7893
7894                                 /* Clean up the mess caused by an aborted checkpoint load
7895                                  * and scan backwards.
7896                                  */
7897                                 yaffs_DeinitialiseBlocks(dev);
7898                                 yaffs_DeinitialiseTnodes(dev);
7899                                 yaffs_DeinitialiseObjects(dev);
7900
7901
7902                                 dev->nErasedBlocks = 0;
7903                                 dev->nFreeChunks = 0;
7904                                 dev->allocationBlock = -1;
7905                                 dev->allocationPage = -1;
7906                                 dev->nDeletedFiles = 0;
7907                                 dev->nUnlinkedFiles = 0;
7908                                 dev->nBackgroundDeletions = 0;
7909
7910                                 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7911                                         init_failed = 1;
7912
7913                                 yaffs_InitialiseTnodes(dev);
7914                                 yaffs_InitialiseObjects(dev);
7915
7916                                 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7917                                         init_failed = 1;
7918
7919                                 if (!init_failed && !yaffs_ScanBackwards(dev))
7920                                         init_failed = 1;
7921                         }
7922                 } else if (!yaffs_Scan(dev))
7923                                 init_failed = 1;
7924
7925                 yaffs_StripDeletedObjects(dev);
7926                 yaffs_FixHangingObjects(dev);
7927                 if(dev->param.emptyLostAndFound)
7928                         yaffs_EmptyLostAndFound(dev);
7929         }
7930
7931         if (init_failed) {
7932                 /* Clean up the mess */
7933                 T(YAFFS_TRACE_TRACING,
7934                   (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7935
7936                 yaffs_Deinitialise(dev);
7937                 return YAFFS_FAIL;
7938         }
7939
7940         /* Zero out stats */
7941         dev->nPageReads = 0;
7942         dev->nPageWrites = 0;
7943         dev->nBlockErasures = 0;
7944         dev->nGCCopies = 0;
7945         dev->nRetriedWrites = 0;
7946
7947         dev->nRetiredBlocks = 0;
7948
7949         yaffs_VerifyFreeChunks(dev);
7950         yaffs_VerifyBlocks(dev);
7951
7952         /* Clean up any aborted checkpoint data */
7953         if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
7954                 yaffs_InvalidateCheckpoint(dev);
7955
7956         T(YAFFS_TRACE_TRACING,
7957           (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7958         return YAFFS_OK;
7959
7960 }
7961
7962 void yaffs_Deinitialise(yaffs_Device *dev)
7963 {
7964         if (dev->isMounted) {
7965                 int i;
7966
7967                 yaffs_DeinitialiseBlocks(dev);
7968                 yaffs_DeinitialiseTnodes(dev);
7969                 yaffs_DeinitialiseObjects(dev);
7970                 if (dev->param.nShortOpCaches > 0 &&
7971                     dev->srCache) {
7972
7973                         for (i = 0; i < dev->param.nShortOpCaches; i++) {
7974                                 if (dev->srCache[i].data)
7975                                         YFREE(dev->srCache[i].data);
7976                                 dev->srCache[i].data = NULL;
7977                         }
7978
7979                         YFREE(dev->srCache);
7980                         dev->srCache = NULL;
7981                 }
7982
7983                 YFREE(dev->gcCleanupList);
7984
7985                 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
7986                         YFREE(dev->tempBuffer[i].buffer);
7987
7988                 dev->isMounted = 0;
7989
7990                 if (dev->param.deinitialiseNAND)
7991                         dev->param.deinitialiseNAND(dev);
7992         }
7993 }
7994
7995 static int yaffs_CountFreeChunks(yaffs_Device *dev)
7996 {
7997         int nFree=0;
7998         int b;
7999
8000         yaffs_BlockInfo *blk;
8001
8002         blk = dev->blockInfo;
8003         for (b = dev->internalStartBlock; b <= dev->internalEndBlock; b++) {
8004                 switch (blk->blockState) {
8005                 case YAFFS_BLOCK_STATE_EMPTY:
8006                 case YAFFS_BLOCK_STATE_ALLOCATING:
8007                 case YAFFS_BLOCK_STATE_COLLECTING:
8008                 case YAFFS_BLOCK_STATE_FULL:
8009                         nFree +=
8010                             (dev->param.nChunksPerBlock - blk->pagesInUse +
8011                              blk->softDeletions);
8012                         break;
8013                 default:
8014                         break;
8015                 }
8016                 blk++;
8017         }
8018
8019         return nFree;
8020 }
8021
8022 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
8023 {
8024         /* This is what we report to the outside world */
8025
8026         int nFree;
8027         int nDirtyCacheChunks;
8028         int blocksForCheckpoint;
8029         int i;
8030
8031 #if 1
8032         nFree = dev->nFreeChunks;
8033 #else
8034         nFree = yaffs_CountFreeChunks(dev);
8035 #endif
8036
8037         nFree += dev->nDeletedFiles;
8038
8039         /* Now count the number of dirty chunks in the cache and subtract those */
8040
8041         for (nDirtyCacheChunks = 0, i = 0; i < dev->param.nShortOpCaches; i++) {
8042                 if (dev->srCache[i].dirty)
8043                         nDirtyCacheChunks++;
8044         }
8045
8046         nFree -= nDirtyCacheChunks;
8047
8048         nFree -= ((dev->param.nReservedBlocks + 1) * dev->param.nChunksPerBlock);
8049
8050         /* Now we figure out how much to reserve for the checkpoint and report that... */
8051         blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
8052         if (blocksForCheckpoint < 0)
8053                 blocksForCheckpoint = 0;
8054
8055         nFree -= (blocksForCheckpoint * dev->param.nChunksPerBlock);
8056
8057         if (nFree < 0)
8058                 nFree = 0;
8059
8060         return nFree;
8061
8062 }
8063
8064 static int yaffs_freeVerificationFailures;
8065
8066 static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
8067 {
8068         int counted;
8069         int difference;
8070
8071         if (yaffs_SkipVerification(dev))
8072                 return;
8073
8074         counted = yaffs_CountFreeChunks(dev);
8075
8076         difference = dev->nFreeChunks - counted;
8077
8078         if (difference) {
8079                 T(YAFFS_TRACE_ALWAYS,
8080                   (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
8081                    dev->nFreeChunks, counted, difference));
8082                 yaffs_freeVerificationFailures++;
8083         }
8084 }
8085
8086 /*---------------------------------------- YAFFS test code ----------------------*/
8087
8088 #define yaffs_CheckStruct(structure, syze, name) \
8089         do { \
8090                 if (sizeof(structure) != syze) { \
8091                         T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
8092                                 name, syze, (int) sizeof(structure))); \
8093                         return YAFFS_FAIL; \
8094                 } \
8095         } while (0)
8096
8097 static int yaffs_CheckStructures(void)
8098 {
8099 /*      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
8100 /*      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
8101 /*      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
8102 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
8103 /*      yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode"); */
8104 #endif
8105 #ifndef CONFIG_YAFFS_WINCE
8106         yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");
8107 #endif
8108         return YAFFS_OK;
8109 }