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 1.106 2010-01-11 04:06:46 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
  39 #include "yaffs_ecc.h"
  40
  41
  42 /* Robustification (if it ever comes about...) */
  43 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND);
  44 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
  45                 int erasedOk);
  46 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
  47                                 const __u8 *data,
  48                                 const yaffs_ExtendedTags *tags);
  49 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
  50                                 const yaffs_ExtendedTags *tags);
  51
  52 /* Other local prototypes */
  53 static void yaffs_UpdateParent(yaffs_Object *obj);
  54 static int yaffs_UnlinkObject(yaffs_Object *obj);
  55 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
  56
  57 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
  58
  59 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev,
  60                                         const __u8 *buffer,
  61                                         yaffs_ExtendedTags *tags,
  62                                         int useReserve);
  63 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
  64                                 int chunkInNAND, int inScan);
  65
  66 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
  67                                         yaffs_ObjectType type);
  68 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
  69                                 yaffs_Object *obj);
  70 static int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name,
  71                                 int force, int isShrink, int shadows);
  72 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
  73 static int yaffs_CheckStructures(void);
  74 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
  75                         int chunkOffset, int *limit);
  76 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
  77
  78 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev, int blockNo);
  79
  80
  81 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
  82                                 int chunkInNAND);
  83
  84 static int yaffs_UnlinkWorker(yaffs_Object *obj);
  85
  86 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
  87                         int chunkInObject);
  88
  89 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
  90                                 yaffs_BlockInfo **blockUsedPtr);
  91
  92 static void yaffs_VerifyFreeChunks(yaffs_Device *dev);
  93
  94 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
  95
  96 static void yaffs_VerifyDirectory(yaffs_Object *directory);
  97 #ifdef YAFFS_PARANOID
  98 static int yaffs_CheckFileSanity(yaffs_Object *in);
  99 #else
 100 #define yaffs_CheckFileSanity(in)
 101 #endif
 102
 103 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
 104 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
 105
 106 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
 107
 108 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
 109                                 yaffs_ExtendedTags *tags);
 110
 111 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
 112                 unsigned pos);
 113 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
 114                                         yaffs_FileStructure *fStruct,
 115                                         __u32 chunkId);
 116
 117 static void yaffs_SkipRestOfBlock(yaffs_Device *dev);
 118 static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
 119                                         int chunkInNAND,
 120                                         const __u8 *data,
 121                                         yaffs_ExtendedTags *tags);
 122
 123 /* Function to calculate chunk and offset */
 124
 125 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut,
 126                 __u32 *offsetOut)
 127 {
 128         int chunk;
 129         __u32 offset;
 130
 131         chunk  = (__u32)(addr >> dev->chunkShift);
 132
 133         if (dev->chunkDiv == 1) {
 134                 /* easy power of 2 case */
 135                 offset = (__u32)(addr & dev->chunkMask);
 136         } else {
 137                 /* Non power-of-2 case */
 138
 139                 loff_t chunkBase;
 140
 141                 chunk /= dev->chunkDiv;
 142
 143                 chunkBase = ((loff_t)chunk) * dev->nDataBytesPerChunk;
 144                 offset = (__u32)(addr - chunkBase);
 145         }
 146
 147         *chunkOut = chunk;
 148         *offsetOut = offset;
 149 }
 150
 151 /* Function to return the number of shifts for a power of 2 greater than or
 152  * equal to the given number
 153  * Note we don't try to cater for all possible numbers and this does not have to
 154  * be hellishly efficient.
 155  */
 156
 157 static __u32 ShiftsGE(__u32 x)
 158 {
 159         int extraBits;
 160         int nShifts;
 161
 162         nShifts = extraBits = 0;
 163
 164         while (x > 1) {
 165                 if (x & 1)
 166                         extraBits++;
 167                 x >>= 1;
 168                 nShifts++;
 169         }
 170
 171         if (extraBits)
 172                 nShifts++;
 173
 174         return nShifts;
 175 }
 176
 177 /* Function to return the number of shifts to get a 1 in bit 0
 178  */
 179
 180 static __u32 Shifts(__u32 x)
 181 {
 182         int nShifts;
 183
 184         nShifts =  0;
 185
 186         if (!x)
 187                 return 0;
 188
 189         while (!(x&1)) {
 190                 x >>= 1;
 191                 nShifts++;
 192         }
 193
 194         return nShifts;
 195 }
 196
 197
 198
 199 /*
 200  * Temporary buffer manipulations.
 201  */
 202
 203 static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
 204 {
 205         int i;
 206         __u8 *buf = (__u8 *)1;
 207
 208         memset(dev->tempBuffer, 0, sizeof(dev->tempBuffer));
 209
 210         for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
 211                 dev->tempBuffer[i].line = 0;    /* not in use */
 212                 dev->tempBuffer[i].buffer = buf =
 213                     YMALLOC_DMA(dev->totalBytesPerChunk);
 214         }
 215
 216         return buf ? YAFFS_OK : YAFFS_FAIL;
 217 }
 218
 219 __u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo)
 220 {
 221         int i, j;
 222
 223         dev->tempInUse++;
 224         if (dev->tempInUse > dev->maxTemp)
 225                 dev->maxTemp = dev->tempInUse;
 226
 227         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 228                 if (dev->tempBuffer[i].line == 0) {
 229                         dev->tempBuffer[i].line = lineNo;
 230                         if ((i + 1) > dev->maxTemp) {
 231                                 dev->maxTemp = i + 1;
 232                                 for (j = 0; j <= i; j++)
 233                                         dev->tempBuffer[j].maxLine =
 234                                             dev->tempBuffer[j].line;
 235                         }
 236
 237                         return dev->tempBuffer[i].buffer;
 238                 }
 239         }
 240
 241         T(YAFFS_TRACE_BUFFERS,
 242           (TSTR("Out of temp buffers at line %d, other held by lines:"),
 243            lineNo));
 244         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
 245                 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
 246
 247         T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
 248
 249         /*
 250          * If we got here then we have to allocate an unmanaged one
 251          * This is not good.
 252          */
 253
 254         dev->unmanagedTempAllocations++;
 255         return YMALLOC(dev->nDataBytesPerChunk);
 256
 257 }
 258
 259 void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer,
 260                                     int lineNo)
 261 {
 262         int i;
 263
 264         dev->tempInUse--;
 265
 266         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 267                 if (dev->tempBuffer[i].buffer == buffer) {
 268                         dev->tempBuffer[i].line = 0;
 269                         return;
 270                 }
 271         }
 272
 273         if (buffer) {
 274                 /* assume it is an unmanaged one. */
 275                 T(YAFFS_TRACE_BUFFERS,
 276                   (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
 277                    lineNo));
 278                 YFREE(buffer);
 279                 dev->unmanagedTempDeallocations++;
 280         }
 281
 282 }
 283
 284 /*
 285  * Determine if we have a managed buffer.
 286  */
 287 int yaffs_IsManagedTempBuffer(yaffs_Device *dev, const __u8 *buffer)
 288 {
 289         int i;
 290
 291         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 292                 if (dev->tempBuffer[i].buffer == buffer)
 293                         return 1;
 294         }
 295
 296         for (i = 0; i < dev->nShortOpCaches; i++) {
 297                 if (dev->srCache[i].data == buffer)
 298                         return 1;
 299         }
 300
 301         if (buffer == dev->checkpointBuffer)
 302                 return 1;
 303
 304         T(YAFFS_TRACE_ALWAYS,
 305                 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
 306         return 0;
 307 }
 308
 309
 310
 311 /*
 312  * Chunk bitmap manipulations
 313  */
 314
 315 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
 316 {
 317         if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
 318                 T(YAFFS_TRACE_ERROR,
 319                         (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
 320                         blk));
 321                 YBUG();
 322         }
 323         return dev->chunkBits +
 324                 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
 325 }
 326
 327 static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
 328 {
 329         if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
 330                         chunk < 0 || chunk >= dev->nChunksPerBlock) {
 331                 T(YAFFS_TRACE_ERROR,
 332                 (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
 333                         blk, chunk));
 334                 YBUG();
 335         }
 336 }
 337
 338 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
 339 {
 340         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 341
 342         memset(blkBits, 0, dev->chunkBitmapStride);
 343 }
 344
 345 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk)
 346 {
 347         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 348
 349         yaffs_VerifyChunkBitId(dev, blk, chunk);
 350
 351         blkBits[chunk / 8] &= ~(1 << (chunk & 7));
 352 }
 353
 354 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk)
 355 {
 356         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 357
 358         yaffs_VerifyChunkBitId(dev, blk, chunk);
 359
 360         blkBits[chunk / 8] |= (1 << (chunk & 7));
 361 }
 362
 363 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk)
 364 {
 365         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 366         yaffs_VerifyChunkBitId(dev, blk, chunk);
 367
 368         return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
 369 }
 370
 371 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk)
 372 {
 373         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 374         int i;
 375         for (i = 0; i < dev->chunkBitmapStride; i++) {
 376                 if (*blkBits)
 377                         return 1;
 378                 blkBits++;
 379         }
 380         return 0;
 381 }
 382
 383 static int yaffs_CountChunkBits(yaffs_Device *dev, int blk)
 384 {
 385         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 386         int i;
 387         int n = 0;
 388         for (i = 0; i < dev->chunkBitmapStride; i++) {
 389                 __u8 x = *blkBits;
 390                 while (x) {
 391                         if (x & 1)
 392                                 n++;
 393                         x >>= 1;
 394                 }
 395
 396                 blkBits++;
 397         }
 398         return n;
 399 }
 400
 401 /*
 402  * Verification code
 403  */
 404
 405 static int yaffs_SkipVerification(yaffs_Device *dev)
 406 {
 407         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
 408 }
 409
 410 static int yaffs_SkipFullVerification(yaffs_Device *dev)
 411 {
 412         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
 413 }
 414
 415 static int yaffs_SkipNANDVerification(yaffs_Device *dev)
 416 {
 417         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
 418 }
 419
 420 static const char *blockStateName[] = {
 421 "Unknown",
 422 "Needs scanning",
 423 "Scanning",
 424 "Empty",
 425 "Allocating",
 426 "Full",
 427 "Dirty",
 428 "Checkpoint",
 429 "Collecting",
 430 "Dead"
 431 };
 432
 433 static void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
 434 {
 435         int actuallyUsed;
 436         int inUse;
 437
 438         if (yaffs_SkipVerification(dev))
 439                 return;
 440
 441         /* Report illegal runtime states */
 442         if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
 443                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState));
 444
 445         switch (bi->blockState) {
 446         case YAFFS_BLOCK_STATE_UNKNOWN:
 447         case YAFFS_BLOCK_STATE_SCANNING:
 448         case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
 449                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
 450                 n, blockStateName[bi->blockState]));
 451         }
 452
 453         /* Check pages in use and soft deletions are legal */
 454
 455         actuallyUsed = bi->pagesInUse - bi->softDeletions;
 456
 457         if (bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
 458            bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
 459            actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
 460                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
 461                 n, bi->pagesInUse, bi->softDeletions));
 462
 463
 464         /* Check chunk bitmap legal */
 465         inUse = yaffs_CountChunkBits(dev, n);
 466         if (inUse != bi->pagesInUse)
 467                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
 468                         n, bi->pagesInUse, inUse));
 469
 470         /* Check that the sequence number is valid.
 471          * Ten million is legal, but is very unlikely
 472          */
 473         if (dev->isYaffs2 &&
 474            (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
 475            (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000))
 476                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has suspect sequence number of %d"TENDSTR),
 477                 n, bi->sequenceNumber));
 478 }
 479
 480 static void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi,
 481                 int n)
 482 {
 483         yaffs_VerifyBlock(dev, bi, n);
 484
 485         /* After collection the block should be in the erased state */
 486         /* This will need to change if we do partial gc */
 487
 488         if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
 489                         bi->blockState != YAFFS_BLOCK_STATE_EMPTY) {
 490                 T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
 491                         n, bi->blockState));
 492         }
 493 }
 494
 495 static void yaffs_VerifyBlocks(yaffs_Device *dev)
 496 {
 497         int i;
 498         int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
 499         int nIllegalBlockStates = 0;
 500
 501         if (yaffs_SkipVerification(dev))
 502                 return;
 503
 504         memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
 505
 506         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
 507                 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
 508                 yaffs_VerifyBlock(dev, bi, i);
 509
 510                 if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
 511                         nBlocksPerState[bi->blockState]++;
 512                 else
 513                         nIllegalBlockStates++;
 514         }
 515
 516         T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
 517         T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
 518
 519         T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
 520         if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
 521                 T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
 522
 523         for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
 524                 T(YAFFS_TRACE_VERIFY,
 525                   (TSTR("%s %d blocks"TENDSTR),
 526                   blockStateName[i], nBlocksPerState[i]));
 527
 528         if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
 529                 T(YAFFS_TRACE_VERIFY,
 530                  (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
 531                  dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
 532
 533         if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
 534                 T(YAFFS_TRACE_VERIFY,
 535                  (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
 536                  dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
 537
 538         if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
 539                 T(YAFFS_TRACE_VERIFY,
 540                  (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
 541                  nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
 542
 543         T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
 544
 545 }
 546
 547 /*
 548  * Verify the object header. oh must be valid, but obj and tags may be NULL in which
 549  * case those tests will not be performed.
 550  */
 551 static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
 552 {
 553         if (obj && yaffs_SkipVerification(obj->myDev))
 554                 return;
 555
 556         if (!(tags && obj && oh)) {
 557                 T(YAFFS_TRACE_VERIFY,
 558                                 (TSTR("Verifying object header tags %p obj %p oh %p"TENDSTR),
 559                                 tags, obj, oh));
 560                 return;
 561         }
 562
 563         if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
 564                         oh->type > YAFFS_OBJECT_TYPE_MAX)
 565                 T(YAFFS_TRACE_VERIFY,
 566                         (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
 567                         tags->objectId, oh->type));
 568
 569         if (tags->objectId != obj->objectId)
 570                 T(YAFFS_TRACE_VERIFY,
 571                         (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
 572                         tags->objectId, obj->objectId));
 573
 574
 575         /*
 576          * Check that the object's parent ids match if parentCheck requested.
 577          *
 578          * Tests do not apply to the root object.
 579          */
 580
 581         if (parentCheck && tags->objectId > 1 && !obj->parent)
 582                 T(YAFFS_TRACE_VERIFY,
 583                         (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
 584                         tags->objectId, oh->parentObjectId));
 585
 586         if (parentCheck && obj->parent &&
 587                         oh->parentObjectId != obj->parent->objectId &&
 588                         (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
 589                         obj->parent->objectId != YAFFS_OBJECTID_DELETED))
 590                 T(YAFFS_TRACE_VERIFY,
 591                         (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
 592                         tags->objectId, oh->parentObjectId, obj->parent->objectId));
 593
 594         if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */
 595                 T(YAFFS_TRACE_VERIFY,
 596                         (TSTR("Obj %d header name is NULL"TENDSTR),
 597                         obj->objectId));
 598
 599         if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
 600                 T(YAFFS_TRACE_VERIFY,
 601                         (TSTR("Obj %d header name is 0xFF"TENDSTR),
 602                         obj->objectId));
 603 }
 604
 605
 606
 607 static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
 608                                         __u32 level, int chunkOffset)
 609 {
 610         int i;
 611         yaffs_Device *dev = obj->myDev;
 612         int ok = 1;
 613
 614         if (tn) {
 615                 if (level > 0) {
 616
 617                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
 618                                 if (tn->internal[i]) {
 619                                         ok = yaffs_VerifyTnodeWorker(obj,
 620                                                         tn->internal[i],
 621                                                         level - 1,
 622                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
 623                                 }
 624                         }
 625                 } else if (level == 0) {
 626                         yaffs_ExtendedTags tags;
 627                         __u32 objectId = obj->objectId;
 628
 629                         chunkOffset <<=  YAFFS_TNODES_LEVEL0_BITS;
 630
 631                         for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
 632                                 __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
 633
 634                                 if (theChunk > 0) {
 635                                         /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
 636                                         yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
 637                                         if (tags.objectId != objectId || tags.chunkId != chunkOffset) {
 638                                                 T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
 639                                                         objectId, chunkOffset, theChunk,
 640                                                         tags.objectId, tags.chunkId));
 641                                         }
 642                                 }
 643                                 chunkOffset++;
 644                         }
 645                 }
 646         }
 647
 648         return ok;
 649
 650 }
 651
 652
 653 static void yaffs_VerifyFile(yaffs_Object *obj)
 654 {
 655         int requiredTallness;
 656         int actualTallness;
 657         __u32 lastChunk;
 658         __u32 x;
 659         __u32 i;
 660         yaffs_Device *dev;
 661         yaffs_ExtendedTags tags;
 662         yaffs_Tnode *tn;
 663         __u32 objectId;
 664
 665         if (!obj)
 666                 return;
 667
 668         if (yaffs_SkipVerification(obj->myDev))
 669                 return;
 670
 671         dev = obj->myDev;
 672         objectId = obj->objectId;
 673
 674         /* Check file size is consistent with tnode depth */
 675         lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
 676         x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
 677         requiredTallness = 0;
 678         while (x > 0) {
 679                 x >>= YAFFS_TNODES_INTERNAL_BITS;
 680                 requiredTallness++;
 681         }
 682
 683         actualTallness = obj->variant.fileVariant.topLevel;
 684
 685         if (requiredTallness > actualTallness)
 686                 T(YAFFS_TRACE_VERIFY,
 687                 (TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
 688                  obj->objectId, actualTallness, requiredTallness));
 689
 690
 691         /* Check that the chunks in the tnode tree are all correct.
 692          * We do this by scanning through the tnode tree and
 693          * checking the tags for every chunk match.
 694          */
 695
 696         if (yaffs_SkipNANDVerification(dev))
 697                 return;
 698
 699         for (i = 1; i <= lastChunk; i++) {
 700                 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i);
 701
 702                 if (tn) {
 703                         __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
 704                         if (theChunk > 0) {
 705                                 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
 706                                 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
 707                                 if (tags.objectId != objectId || tags.chunkId != i) {
 708                                         T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
 709                                                 objectId, i, theChunk,
 710                                                 tags.objectId, tags.chunkId));
 711                                 }
 712                         }
 713                 }
 714         }
 715 }
 716
 717
 718 static void yaffs_VerifyHardLink(yaffs_Object *obj)
 719 {
 720         if (obj && yaffs_SkipVerification(obj->myDev))
 721                 return;
 722
 723         /* Verify sane equivalent object */
 724 }
 725
 726 static void yaffs_VerifySymlink(yaffs_Object *obj)
 727 {
 728         if (obj && yaffs_SkipVerification(obj->myDev))
 729                 return;
 730
 731         /* Verify symlink string */
 732 }
 733
 734 static void yaffs_VerifySpecial(yaffs_Object *obj)
 735 {
 736         if (obj && yaffs_SkipVerification(obj->myDev))
 737                 return;
 738 }
 739
 740 static void yaffs_VerifyObject(yaffs_Object *obj)
 741 {
 742         yaffs_Device *dev;
 743
 744         __u32 chunkMin;
 745         __u32 chunkMax;
 746
 747         __u32 chunkIdOk;
 748         __u32 chunkInRange;
 749         __u32 chunkShouldNotBeDeleted;
 750         __u32 chunkValid;
 751
 752         if (!obj)
 753                 return;
 754
 755         if (obj->beingCreated)
 756                 return;
 757
 758         dev = obj->myDev;
 759
 760         if (yaffs_SkipVerification(dev))
 761                 return;
 762
 763         /* Check sane object header chunk */
 764
 765         chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
 766         chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
 767
 768         chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
 769         chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
 770         chunkValid = chunkInRange &&
 771                         yaffs_CheckChunkBit(dev,
 772                                         obj->hdrChunk / dev->nChunksPerBlock,
 773                                         obj->hdrChunk % dev->nChunksPerBlock);
 774         chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
 775
 776         if (!obj->fake &&
 777                         (!chunkIdOk || chunkShouldNotBeDeleted)) {
 778                 T(YAFFS_TRACE_VERIFY,
 779                         (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
 780                         obj->objectId, obj->hdrChunk,
 781                         chunkIdOk ? "" : ",out of range",
 782                         chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
 783         }
 784
 785         if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
 786                 yaffs_ExtendedTags tags;
 787                 yaffs_ObjectHeader *oh;
 788                 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
 789
 790                 oh = (yaffs_ObjectHeader *)buffer;
 791
 792                 yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer,
 793                                 &tags);
 794
 795                 yaffs_VerifyObjectHeader(obj, oh, &tags, 1);
 796
 797                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
 798         }
 799
 800         /* Verify it has a parent */
 801         if (obj && !obj->fake &&
 802                         (!obj->parent || obj->parent->myDev != dev)) {
 803                 T(YAFFS_TRACE_VERIFY,
 804                         (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
 805                         obj->objectId, obj->parent));
 806         }
 807
 808         /* Verify parent is a directory */
 809         if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
 810                 T(YAFFS_TRACE_VERIFY,
 811                         (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
 812                         obj->objectId, obj->parent->variantType));
 813         }
 814
 815         switch (obj->variantType) {
 816         case YAFFS_OBJECT_TYPE_FILE:
 817                 yaffs_VerifyFile(obj);
 818                 break;
 819         case YAFFS_OBJECT_TYPE_SYMLINK:
 820                 yaffs_VerifySymlink(obj);
 821                 break;
 822         case YAFFS_OBJECT_TYPE_DIRECTORY:
 823                 yaffs_VerifyDirectory(obj);
 824                 break;
 825         case YAFFS_OBJECT_TYPE_HARDLINK:
 826                 yaffs_VerifyHardLink(obj);
 827                 break;
 828         case YAFFS_OBJECT_TYPE_SPECIAL:
 829                 yaffs_VerifySpecial(obj);
 830                 break;
 831         case YAFFS_OBJECT_TYPE_UNKNOWN:
 832         default:
 833                 T(YAFFS_TRACE_VERIFY,
 834                 (TSTR("Obj %d has illegaltype %d"TENDSTR),
 835                 obj->objectId, obj->variantType));
 836                 break;
 837         }
 838 }
 839
 840 static void yaffs_VerifyObjects(yaffs_Device *dev)
 841 {
 842         yaffs_Object *obj;
 843         int i;
 844         struct ylist_head *lh;
 845
 846         if (yaffs_SkipVerification(dev))
 847                 return;
 848
 849         /* Iterate through the objects in each hash entry */
 850
 851         for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
 852                 ylist_for_each(lh, &dev->objectBucket[i].list) {
 853                         if (lh) {
 854                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
 855                                 yaffs_VerifyObject(obj);
 856                         }
 857                 }
 858         }
 859 }
 860
 861
 862 /*
 863  *  Simple hash function. Needs to have a reasonable spread
 864  */
 865
 866 static Y_INLINE int yaffs_HashFunction(int n)
 867 {
 868         n = abs(n);
 869         return n % YAFFS_NOBJECT_BUCKETS;
 870 }
 871
 872 /*
 873  * Access functions to useful fake objects.
 874  * Note that root might have a presence in NAND if permissions are set.
 875  */
 876
 877 yaffs_Object *yaffs_Root(yaffs_Device *dev)
 878 {
 879         return dev->rootDir;
 880 }
 881
 882 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
 883 {
 884         return dev->lostNFoundDir;
 885 }
 886
 887
 888 /*
 889  *  Erased NAND checking functions
 890  */
 891
 892 int yaffs_CheckFF(__u8 *buffer, int nBytes)
 893 {
 894         /* Horrible, slow implementation */
 895         while (nBytes--) {
 896                 if (*buffer != 0xFF)
 897                         return 0;
 898                 buffer++;
 899         }
 900         return 1;
 901 }
 902
 903 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
 904                                 int chunkInNAND)
 905 {
 906         int retval = YAFFS_OK;
 907         __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
 908         yaffs_ExtendedTags tags;
 909         int result;
 910
 911         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
 912
 913         if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
 914                 retval = YAFFS_FAIL;
 915
 916         if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
 917                 T(YAFFS_TRACE_NANDACCESS,
 918                   (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
 919                 retval = YAFFS_FAIL;
 920         }
 921
 922         yaffs_ReleaseTempBuffer(dev, data, __LINE__);
 923
 924         return retval;
 925
 926 }
 927
 928
 929 static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
 930                                         int chunkInNAND,
 931                                         const __u8 *data,
 932                                         yaffs_ExtendedTags *tags)
 933 {
 934         int retval = YAFFS_OK;
 935         yaffs_ExtendedTags tempTags;
 936         __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
 937         int result;
 938
 939         result = yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,&tempTags);
 940         if(memcmp(buffer,data,dev->nDataBytesPerChunk) ||
 941                 tempTags.objectId != tags->objectId ||
 942                 tempTags.chunkId  != tags->chunkId ||
 943                 tempTags.byteCount != tags->byteCount)
 944                 retval = YAFFS_FAIL;
 945
 946         yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
 947
 948         return retval;
 949 }
 950
 951 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
 952                                         const __u8 *data,
 953                                         yaffs_ExtendedTags *tags,
 954                                         int useReserve)
 955 {
 956         int attempts = 0;
 957         int writeOk = 0;
 958         int chunk;
 959
 960         yaffs_InvalidateCheckpoint(dev);
 961
 962         do {
 963                 yaffs_BlockInfo *bi = 0;
 964                 int erasedOk = 0;
 965
 966                 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
 967                 if (chunk < 0) {
 968                         /* no space */
 969                         break;
 970                 }
 971
 972                 /* First check this chunk is erased, if it needs
 973                  * checking.  The checking policy (unless forced
 974                  * always on) is as follows:
 975                  *
 976                  * Check the first page we try to write in a block.
 977                  * If the check passes then we don't need to check any
 978                  * more.        If the check fails, we check again...
 979                  * If the block has been erased, we don't need to check.
 980                  *
 981                  * However, if the block has been prioritised for gc,
 982                  * then we think there might be something odd about
 983                  * this block and stop using it.
 984                  *
 985                  * Rationale: We should only ever see chunks that have
 986                  * not been erased if there was a partially written
 987                  * chunk due to power loss.  This checking policy should
 988                  * catch that case with very few checks and thus save a
 989                  * lot of checks that are most likely not needed.
 990                  *
 991                  * Mods to the above
 992                  * If an erase check fails or the write fails we skip the
 993                  * rest of the block.
 994                  */
 995
 996                 /* let's give it a try */
 997                 attempts++;
 998
 999 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
1000                 bi->skipErasedCheck = 0;
1001 #endif
1002                 if (!bi->skipErasedCheck) {
1003                         erasedOk = yaffs_CheckChunkErased(dev, chunk);
1004                         if (erasedOk != YAFFS_OK) {
1005                                 T(YAFFS_TRACE_ERROR,
1006                                 (TSTR("**>> yaffs chunk %d was not erased"
1007                                 TENDSTR), chunk));
1008
1009                                 /* If not erased, delete this one,
1010                                  * skip rest of block and
1011                                  * try another chunk */
1012                                  yaffs_DeleteChunk(dev,chunk,1,__LINE__);
1013                                  yaffs_SkipRestOfBlock(dev);
1014                                 continue;
1015                         }
1016                 }
1017
1018                 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
1019                                 data, tags);
1020
1021                 if(!bi->skipErasedCheck)
1022                         writeOk = yaffs_VerifyChunkWritten(dev, chunk, data, tags);
1023
1024                 if (writeOk != YAFFS_OK) {
1025                         /* Clean up aborted write, skip to next block and
1026                          * try another chunk */
1027                         yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
1028                         continue;
1029                 }
1030
1031                 bi->skipErasedCheck = 1;
1032
1033                 /* Copy the data into the robustification buffer */
1034                 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
1035
1036         } while (writeOk != YAFFS_OK &&
1037                 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
1038
1039         if (!writeOk)
1040                 chunk = -1;
1041
1042         if (attempts > 1) {
1043                 T(YAFFS_TRACE_ERROR,
1044                         (TSTR("**>> yaffs write required %d attempts" TENDSTR),
1045                         attempts));
1046
1047                 dev->nRetriedWrites += (attempts - 1);
1048         }
1049
1050         return chunk;
1051 }
1052
1053 /*
1054  * Block retiring for handling a broken block.
1055  */
1056
1057 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
1058 {
1059         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1060
1061         yaffs_InvalidateCheckpoint(dev);
1062
1063         if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
1064                 if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
1065                         T(YAFFS_TRACE_ALWAYS, (TSTR(
1066                                 "yaffs: Failed to mark bad and erase block %d"
1067                                 TENDSTR), blockInNAND));
1068                 } else {
1069                         yaffs_ExtendedTags tags;
1070                         int chunkId = blockInNAND * dev->nChunksPerBlock;
1071
1072                         __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
1073
1074                         memset(buffer, 0xff, dev->nDataBytesPerChunk);
1075                         yaffs_InitialiseTags(&tags);
1076                         tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
1077                         if (dev->writeChunkWithTagsToNAND(dev, chunkId -
1078                                 dev->chunkOffset, buffer, &tags) != YAFFS_OK)
1079                                 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
1080                                         TCONT("write bad block marker to block %d")
1081                                         TENDSTR), blockInNAND));
1082
1083                         yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
1084                 }
1085         }
1086
1087         bi->blockState = YAFFS_BLOCK_STATE_DEAD;
1088         bi->gcPrioritise = 0;
1089         bi->needsRetiring = 0;
1090
1091         dev->nRetiredBlocks++;
1092 }
1093
1094 /*
1095  * Functions for robustisizing TODO
1096  *
1097  */
1098
1099 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
1100                                 const __u8 *data,
1101                                 const yaffs_ExtendedTags *tags)
1102 {
1103 }
1104
1105 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
1106                                 const yaffs_ExtendedTags *tags)
1107 {
1108 }
1109
1110 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1111 {
1112         if (!bi->gcPrioritise) {
1113                 bi->gcPrioritise = 1;
1114                 dev->hasPendingPrioritisedGCs = 1;
1115                 bi->chunkErrorStrikes++;
1116
1117                 if (bi->chunkErrorStrikes > 3) {
1118                         bi->needsRetiring = 1; /* Too many stikes, so retire this */
1119                         T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1120
1121                 }
1122         }
1123 }
1124
1125 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
1126                 int erasedOk)
1127 {
1128         int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
1129         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1130
1131         yaffs_HandleChunkError(dev, bi);
1132
1133         if (erasedOk) {
1134                 /* Was an actual write failure, so mark the block for retirement  */
1135                 bi->needsRetiring = 1;
1136                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1137                   (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1138         }
1139
1140         /* Delete the chunk */
1141         yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1142         yaffs_SkipRestOfBlock(dev);
1143 }
1144
1145
1146 /*---------------- Name handling functions ------------*/
1147
1148 static __u16 yaffs_CalcNameSum(const YCHAR *name)
1149 {
1150         __u16 sum = 0;
1151         __u16 i = 1;
1152
1153         const YUCHAR *bname = (const YUCHAR *) name;
1154         if (bname) {
1155                 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1156
1157 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1158                         sum += yaffs_toupper(*bname) * i;
1159 #else
1160                         sum += (*bname) * i;
1161 #endif
1162                         i++;
1163                         bname++;
1164                 }
1165         }
1166         return sum;
1167 }
1168
1169 static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
1170 {
1171 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1172         memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
1173         if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH)
1174                 yaffs_strcpy(obj->shortName, name);
1175         else
1176                 obj->shortName[0] = _Y('\0');
1177 #endif
1178         obj->sum = yaffs_CalcNameSum(name);
1179 }
1180
1181 /*-------------------- TNODES -------------------
1182
1183  * List of spare tnodes
1184  * The list is hooked together using the first pointer
1185  * in the tnode.
1186  */
1187
1188 /* yaffs_CreateTnodes creates a bunch more tnodes and
1189  * adds them to the tnode free list.
1190  * Don't use this function directly
1191  */
1192
1193 static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
1194 {
1195         int i;
1196         int tnodeSize;
1197         yaffs_Tnode *newTnodes;
1198         __u8 *mem;
1199         yaffs_Tnode *curr;
1200         yaffs_Tnode *next;
1201         yaffs_TnodeList *tnl;
1202
1203         if (nTnodes < 1)
1204                 return YAFFS_OK;
1205
1206         /* Calculate the tnode size in bytes for variable width tnode support.
1207          * Must be a multiple of 32-bits  */
1208         tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1209
1210         if (tnodeSize < sizeof(yaffs_Tnode))
1211                 tnodeSize = sizeof(yaffs_Tnode);
1212
1213         /* make these things */
1214
1215         newTnodes = YMALLOC(nTnodes * tnodeSize);
1216         mem = (__u8 *)newTnodes;
1217
1218         if (!newTnodes) {
1219                 T(YAFFS_TRACE_ERROR,
1220                         (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1221                 return YAFFS_FAIL;
1222         }
1223
1224         /* Hook them into the free list */
1225 #if 0
1226         for (i = 0; i < nTnodes - 1; i++) {
1227                 newTnodes[i].internal[0] = &newTnodes[i + 1];
1228 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1229                 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1230 #endif
1231         }
1232
1233         newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1234 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1235         newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1236 #endif
1237         dev->freeTnodes = newTnodes;
1238 #else
1239         /* New hookup for wide tnodes */
1240         for (i = 0; i < nTnodes - 1; i++) {
1241                 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1242                 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1243                 curr->internal[0] = next;
1244         }
1245
1246         curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1247         curr->internal[0] = dev->freeTnodes;
1248         dev->freeTnodes = (yaffs_Tnode *)mem;
1249
1250 #endif
1251
1252
1253         dev->nFreeTnodes += nTnodes;
1254         dev->nTnodesCreated += nTnodes;
1255
1256         /* Now add this bunch of tnodes to a list for freeing up.
1257          * NB If we can't add this to the management list it isn't fatal
1258          * but it just means we can't free this bunch of tnodes later.
1259          */
1260
1261         tnl = YMALLOC(sizeof(yaffs_TnodeList));
1262         if (!tnl) {
1263                 T(YAFFS_TRACE_ERROR,
1264                   (TSTR
1265                    ("yaffs: Could not add tnodes to management list" TENDSTR)));
1266                    return YAFFS_FAIL;
1267         } else {
1268                 tnl->tnodes = newTnodes;
1269                 tnl->next = dev->allocatedTnodeList;
1270                 dev->allocatedTnodeList = tnl;
1271         }
1272
1273         T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1274
1275         return YAFFS_OK;
1276 }
1277
1278 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1279
1280 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device *dev)
1281 {
1282         yaffs_Tnode *tn = NULL;
1283
1284         /* If there are none left make more */
1285         if (!dev->freeTnodes)
1286                 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1287
1288         if (dev->freeTnodes) {
1289                 tn = dev->freeTnodes;
1290 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1291                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1292                         /* Hoosterman, this thing looks like it isn't in the list */
1293                         T(YAFFS_TRACE_ALWAYS,
1294                           (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1295                 }
1296 #endif
1297                 dev->freeTnodes = dev->freeTnodes->internal[0];
1298                 dev->nFreeTnodes--;
1299         }
1300
1301         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1302
1303         return tn;
1304 }
1305
1306 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
1307 {
1308         yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1309         int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1310
1311         if (tnodeSize < sizeof(yaffs_Tnode))
1312                 tnodeSize = sizeof(yaffs_Tnode);
1313
1314         if (tn)
1315                 memset(tn, 0, tnodeSize);
1316
1317         return tn;
1318 }
1319
1320 /* FreeTnode frees up a tnode and puts it back on the free list */
1321 static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
1322 {
1323         if (tn) {
1324 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1325                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1326                         /* Hoosterman, this thing looks like it is already in the list */
1327                         T(YAFFS_TRACE_ALWAYS,
1328                           (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1329                 }
1330                 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1331 #endif
1332                 tn->internal[0] = dev->freeTnodes;
1333                 dev->freeTnodes = tn;
1334                 dev->nFreeTnodes++;
1335         }
1336         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1337 }
1338
1339 static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
1340 {
1341         /* Free the list of allocated tnodes */
1342         yaffs_TnodeList *tmp;
1343
1344         while (dev->allocatedTnodeList) {
1345                 tmp = dev->allocatedTnodeList->next;
1346
1347                 YFREE(dev->allocatedTnodeList->tnodes);
1348                 YFREE(dev->allocatedTnodeList);
1349                 dev->allocatedTnodeList = tmp;
1350
1351         }
1352
1353         dev->freeTnodes = NULL;
1354         dev->nFreeTnodes = 0;
1355         dev->nTnodesCreated = 0;
1356 }
1357
1358 static void yaffs_InitialiseTnodes(yaffs_Device *dev)
1359 {
1360         dev->allocatedTnodeList = NULL;
1361         dev->freeTnodes = NULL;
1362         dev->nFreeTnodes = 0;
1363         dev->nTnodesCreated = 0;
1364 }
1365
1366
1367 void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
1368                 unsigned val)
1369 {
1370         __u32 *map = (__u32 *)tn;
1371         __u32 bitInMap;
1372         __u32 bitInWord;
1373         __u32 wordInMap;
1374         __u32 mask;
1375
1376         pos &= YAFFS_TNODES_LEVEL0_MASK;
1377         val >>= dev->chunkGroupBits;
1378
1379         bitInMap = pos * dev->tnodeWidth;
1380         wordInMap = bitInMap / 32;
1381         bitInWord = bitInMap & (32 - 1);
1382
1383         mask = dev->tnodeMask << bitInWord;
1384
1385         map[wordInMap] &= ~mask;
1386         map[wordInMap] |= (mask & (val << bitInWord));
1387
1388         if (dev->tnodeWidth > (32 - bitInWord)) {
1389                 bitInWord = (32 - bitInWord);
1390                 wordInMap++;;
1391                 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1392                 map[wordInMap] &= ~mask;
1393                 map[wordInMap] |= (mask & (val >> bitInWord));
1394         }
1395 }
1396
1397 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
1398                 unsigned pos)
1399 {
1400         __u32 *map = (__u32 *)tn;
1401         __u32 bitInMap;
1402         __u32 bitInWord;
1403         __u32 wordInMap;
1404         __u32 val;
1405
1406         pos &= YAFFS_TNODES_LEVEL0_MASK;
1407
1408         bitInMap = pos * dev->tnodeWidth;
1409         wordInMap = bitInMap / 32;
1410         bitInWord = bitInMap & (32 - 1);
1411
1412         val = map[wordInMap] >> bitInWord;
1413
1414         if      (dev->tnodeWidth > (32 - bitInWord)) {
1415                 bitInWord = (32 - bitInWord);
1416                 wordInMap++;;
1417                 val |= (map[wordInMap] << bitInWord);
1418         }
1419
1420         val &= dev->tnodeMask;
1421         val <<= dev->chunkGroupBits;
1422
1423         return val;
1424 }
1425
1426 /* ------------------- End of individual tnode manipulation -----------------*/
1427
1428 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1429  * The look up tree is represented by the top tnode and the number of topLevel
1430  * in the tree. 0 means only the level 0 tnode is in the tree.
1431  */
1432
1433 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1434 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
1435                                         yaffs_FileStructure *fStruct,
1436                                         __u32 chunkId)
1437 {
1438         yaffs_Tnode *tn = fStruct->top;
1439         __u32 i;
1440         int requiredTallness;
1441         int level = fStruct->topLevel;
1442
1443         /* Check sane level and chunk Id */
1444         if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
1445                 return NULL;
1446
1447         if (chunkId > YAFFS_MAX_CHUNK_ID)
1448                 return NULL;
1449
1450         /* First check we're tall enough (ie enough topLevel) */
1451
1452         i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1453         requiredTallness = 0;
1454         while (i) {
1455                 i >>= YAFFS_TNODES_INTERNAL_BITS;
1456                 requiredTallness++;
1457         }
1458
1459         if (requiredTallness > fStruct->topLevel)
1460                 return NULL; /* Not tall enough, so we can't find it */
1461
1462         /* Traverse down to level 0 */
1463         while (level > 0 && tn) {
1464                 tn = tn->internal[(chunkId >>
1465                         (YAFFS_TNODES_LEVEL0_BITS +
1466                                 (level - 1) *
1467                                 YAFFS_TNODES_INTERNAL_BITS)) &
1468                         YAFFS_TNODES_INTERNAL_MASK];
1469                 level--;
1470         }
1471
1472         return tn;
1473 }
1474
1475 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1476  * This happens in two steps:
1477  *  1. If the tree isn't tall enough, then make it taller.
1478  *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1479  *
1480  * Used when modifying the tree.
1481  *
1482  *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1483  *  be plugged into the ttree.
1484  */
1485
1486 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
1487                                         yaffs_FileStructure *fStruct,
1488                                         __u32 chunkId,
1489                                         yaffs_Tnode *passedTn)
1490 {
1491         int requiredTallness;
1492         int i;
1493         int l;
1494         yaffs_Tnode *tn;
1495
1496         __u32 x;
1497
1498
1499         /* Check sane level and page Id */
1500         if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
1501                 return NULL;
1502
1503         if (chunkId > YAFFS_MAX_CHUNK_ID)
1504                 return NULL;
1505
1506         /* First check we're tall enough (ie enough topLevel) */
1507
1508         x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1509         requiredTallness = 0;
1510         while (x) {
1511                 x >>= YAFFS_TNODES_INTERNAL_BITS;
1512                 requiredTallness++;
1513         }
1514
1515
1516         if (requiredTallness > fStruct->topLevel) {
1517                 /* Not tall enough, gotta make the tree taller */
1518                 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1519
1520                         tn = yaffs_GetTnode(dev);
1521
1522                         if (tn) {
1523                                 tn->internal[0] = fStruct->top;
1524                                 fStruct->top = tn;
1525                                 fStruct->topLevel++;
1526                         } else {
1527                                 T(YAFFS_TRACE_ERROR,
1528                                         (TSTR("yaffs: no more tnodes" TENDSTR)));
1529                                 return NULL;
1530                         }
1531                 }
1532         }
1533
1534         /* Traverse down to level 0, adding anything we need */
1535
1536         l = fStruct->topLevel;
1537         tn = fStruct->top;
1538
1539         if (l > 0) {
1540                 while (l > 0 && tn) {
1541                         x = (chunkId >>
1542                              (YAFFS_TNODES_LEVEL0_BITS +
1543                               (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1544                             YAFFS_TNODES_INTERNAL_MASK;
1545
1546
1547                         if ((l > 1) && !tn->internal[x]) {
1548                                 /* Add missing non-level-zero tnode */
1549                                 tn->internal[x] = yaffs_GetTnode(dev);
1550                                 if(!tn->internal[x])
1551                                         return NULL;
1552
1553                         } else if (l == 1) {
1554                                 /* Looking from level 1 at level 0 */
1555                                 if (passedTn) {
1556                                         /* If we already have one, then release it.*/
1557                                         if (tn->internal[x])
1558                                                 yaffs_FreeTnode(dev, tn->internal[x]);
1559                                         tn->internal[x] = passedTn;
1560
1561                                 } else if (!tn->internal[x]) {
1562                                         /* Don't have one, none passed in */
1563                                         tn->internal[x] = yaffs_GetTnode(dev);
1564                                         if(!tn->internal[x])
1565                                                 return NULL;
1566                                 }
1567                         }
1568
1569                         tn = tn->internal[x];
1570                         l--;
1571                 }
1572         } else {
1573                 /* top is level 0 */
1574                 if (passedTn) {
1575                         memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1576                         yaffs_FreeTnode(dev, passedTn);
1577                 }
1578         }
1579
1580         return tn;
1581 }
1582
1583 static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
1584                                 yaffs_ExtendedTags *tags, int objectId,
1585                                 int chunkInInode)
1586 {
1587         int j;
1588
1589         for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1590                 if (yaffs_CheckChunkBit(dev, theChunk / dev->nChunksPerBlock,
1591                                 theChunk % dev->nChunksPerBlock)) {
1592
1593                         if(dev->chunkGroupSize == 1)
1594                                 return theChunk;
1595                         else {
1596                                 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1597                                                                 tags);
1598                                 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1599                                         /* found it; */
1600                                         return theChunk;
1601                                 }
1602                         }
1603                 }
1604                 theChunk++;
1605         }
1606         return -1;
1607 }
1608
1609
1610 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1611  * chunks and tnodes in the file
1612  * Returns 1 if the tree was deleted.
1613  * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1614  */
1615
1616 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
1617                               int chunkOffset, int *limit)
1618 {
1619         int i;
1620         int chunkInInode;
1621         int theChunk;
1622         yaffs_ExtendedTags tags;
1623         int foundChunk;
1624         yaffs_Device *dev = in->myDev;
1625
1626         int allDone = 1;
1627
1628         if (tn) {
1629                 if (level > 0) {
1630                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1631                              i--) {
1632                                 if (tn->internal[i]) {
1633                                         if (limit && (*limit) < 0) {
1634                                                 allDone = 0;
1635                                         } else {
1636                                                 allDone =
1637                                                         yaffs_DeleteWorker(in,
1638                                                                 tn->
1639                                                                 internal
1640                                                                 [i],
1641                                                                 level -
1642                                                                 1,
1643                                                                 (chunkOffset
1644                                                                         <<
1645                                                                         YAFFS_TNODES_INTERNAL_BITS)
1646                                                                 + i,
1647                                                                 limit);
1648                                         }
1649                                         if (allDone) {
1650                                                 yaffs_FreeTnode(dev,
1651                                                                 tn->
1652                                                                 internal[i]);
1653                                                 tn->internal[i] = NULL;
1654                                         }
1655                                 }
1656                         }
1657                         return (allDone) ? 1 : 0;
1658                 } else if (level == 0) {
1659                         int hitLimit = 0;
1660
1661                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1662                                         i--) {
1663                                 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1664                                 if (theChunk) {
1665
1666                                         chunkInInode = (chunkOffset <<
1667                                                 YAFFS_TNODES_LEVEL0_BITS) + i;
1668
1669                                         foundChunk =
1670                                                 yaffs_FindChunkInGroup(dev,
1671                                                                 theChunk,
1672                                                                 &tags,
1673                                                                 in->objectId,
1674                                                                 chunkInInode);
1675
1676                                         if (foundChunk > 0) {
1677                                                 yaffs_DeleteChunk(dev,
1678                                                                   foundChunk, 1,
1679                                                                   __LINE__);
1680                                                 in->nDataChunks--;
1681                                                 if (limit) {
1682                                                         *limit = *limit - 1;
1683                                                         if (*limit <= 0)
1684                                                                 hitLimit = 1;
1685                                                 }
1686
1687                                         }
1688
1689                                         yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1690                                 }
1691
1692                         }
1693                         return (i < 0) ? 1 : 0;
1694
1695                 }
1696
1697         }
1698
1699         return 1;
1700
1701 }
1702
1703 static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
1704 {
1705         yaffs_BlockInfo *theBlock;
1706
1707         T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1708
1709         theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1710         if (theBlock) {
1711                 theBlock->softDeletions++;
1712                 dev->nFreeChunks++;
1713         }
1714 }
1715
1716 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1717  * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1718  * of the tnode.
1719  * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1720  */
1721
1722 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
1723                                   __u32 level, int chunkOffset)
1724 {
1725         int i;
1726         int theChunk;
1727         int allDone = 1;
1728         yaffs_Device *dev = in->myDev;
1729
1730         if (tn) {
1731                 if (level > 0) {
1732
1733                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1734                              i--) {
1735                                 if (tn->internal[i]) {
1736                                         allDone =
1737                                             yaffs_SoftDeleteWorker(in,
1738                                                                    tn->
1739                                                                    internal[i],
1740                                                                    level - 1,
1741                                                                    (chunkOffset
1742                                                                     <<
1743                                                                     YAFFS_TNODES_INTERNAL_BITS)
1744                                                                    + i);
1745                                         if (allDone) {
1746                                                 yaffs_FreeTnode(dev,
1747                                                                 tn->
1748                                                                 internal[i]);
1749                                                 tn->internal[i] = NULL;
1750                                         } else {
1751                                                 /* Hoosterman... how could this happen? */
1752                                         }
1753                                 }
1754                         }
1755                         return (allDone) ? 1 : 0;
1756                 } else if (level == 0) {
1757
1758                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1759                                 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1760                                 if (theChunk) {
1761                                         /* Note this does not find the real chunk, only the chunk group.
1762                                          * We make an assumption that a chunk group is not larger than
1763                                          * a block.
1764                                          */
1765                                         yaffs_SoftDeleteChunk(dev, theChunk);
1766                                         yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1767                                 }
1768
1769                         }
1770                         return 1;
1771
1772                 }
1773
1774         }
1775
1776         return 1;
1777
1778 }
1779
1780 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1781 {
1782         if (obj->deleted &&
1783             obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1784                 if (obj->nDataChunks <= 0) {
1785                         /* Empty file with no duplicate object headers, just delete it immediately */
1786                         yaffs_FreeTnode(obj->myDev,
1787                                         obj->variant.fileVariant.top);
1788                         obj->variant.fileVariant.top = NULL;
1789                         T(YAFFS_TRACE_TRACING,
1790                           (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1791                            obj->objectId));
1792                         yaffs_DoGenericObjectDeletion(obj);
1793                 } else {
1794                         yaffs_SoftDeleteWorker(obj,
1795                                                obj->variant.fileVariant.top,
1796                                                obj->variant.fileVariant.
1797                                                topLevel, 0);
1798                         obj->softDeleted = 1;
1799                 }
1800         }
1801 }
1802
1803 /* Pruning removes any part of the file structure tree that is beyond the
1804  * bounds of the file (ie that does not point to chunks).
1805  *
1806  * A file should only get pruned when its size is reduced.
1807  *
1808  * Before pruning, the chunks must be pulled from the tree and the
1809  * level 0 tnode entries must be zeroed out.
1810  * Could also use this for file deletion, but that's probably better handled
1811  * by a special case.
1812  *
1813  * This function is recursive. For levels > 0 the function is called again on
1814  * any sub-tree. For level == 0 we just check if the sub-tree has data.
1815  * If there is no data in a subtree then it is pruned.
1816  */
1817
1818 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
1819                                 __u32 level, int del0)
1820 {
1821         int i;
1822         int hasData;
1823
1824         if (tn) {
1825                 hasData = 0;
1826
1827                 if(level > 0){
1828                         for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1829                                 if (tn->internal[i]) {
1830                                         tn->internal[i] =
1831                                                 yaffs_PruneWorker(dev, tn->internal[i],
1832                                                         level - 1,
1833                                                         (i == 0) ? del0 : 1);
1834                                 }
1835
1836                                 if (tn->internal[i])
1837                                         hasData++;
1838                         }
1839                 } else {
1840                         int tnodeSize;
1841                         __u32 *map = (__u32 *)tn;
1842                         tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1843
1844                         if (tnodeSize < sizeof(yaffs_Tnode))
1845                                 tnodeSize = sizeof(yaffs_Tnode);
1846                         tnodeSize /= sizeof(__u32);
1847
1848                         for(i = 0; !hasData && i < tnodeSize; i++){
1849                                 if(map[i])
1850                                         hasData++;
1851                         }
1852                 }
1853
1854                 if (hasData == 0 && del0) {
1855                         /* Free and return NULL */
1856
1857                         yaffs_FreeTnode(dev, tn);
1858                         tn = NULL;
1859                 }
1860
1861         }
1862
1863         return tn;
1864
1865 }
1866
1867 static int yaffs_PruneFileStructure(yaffs_Device *dev,
1868                                 yaffs_FileStructure *fStruct)
1869 {
1870         int i;
1871         int hasData;
1872         int done = 0;
1873         yaffs_Tnode *tn;
1874
1875         if (fStruct->topLevel > 0) {
1876                 fStruct->top =
1877                     yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1878
1879                 /* Now we have a tree with all the non-zero branches NULL but the height
1880                  * is the same as it was.
1881                  * Let's see if we can trim internal tnodes to shorten the tree.
1882                  * We can do this if only the 0th element in the tnode is in use
1883                  * (ie all the non-zero are NULL)
1884                  */
1885
1886                 while (fStruct->topLevel && !done) {
1887                         tn = fStruct->top;
1888
1889                         hasData = 0;
1890                         for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1891                                 if (tn->internal[i])
1892                                         hasData++;
1893                         }
1894
1895                         if (!hasData) {
1896                                 fStruct->top = tn->internal[0];
1897                                 fStruct->topLevel--;
1898                                 yaffs_FreeTnode(dev, tn);
1899                         } else {
1900                                 done = 1;
1901                         }
1902                 }
1903         }
1904
1905         return YAFFS_OK;
1906 }
1907
1908 /*-------------------- End of File Structure functions.-------------------*/
1909
1910 /* yaffs_CreateFreeObjects creates a bunch more objects and
1911  * adds them to the object free list.
1912  */
1913 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
1914 {
1915         int i;
1916         yaffs_Object *newObjects;
1917         yaffs_ObjectList *list;
1918
1919         if (nObjects < 1)
1920                 return YAFFS_OK;
1921
1922         /* make these things */
1923         newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1924         list = YMALLOC(sizeof(yaffs_ObjectList));
1925
1926         if (!newObjects || !list) {
1927                 if (newObjects){
1928                         YFREE(newObjects);
1929                         newObjects = NULL;
1930                 }
1931                 if (list){
1932                         YFREE(list);
1933                         list = NULL;
1934                 }
1935                 T(YAFFS_TRACE_ALLOCATE,
1936                   (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1937                 return YAFFS_FAIL;
1938         }
1939
1940         /* Hook them into the free list */
1941         for (i = 0; i < nObjects - 1; i++) {
1942                 newObjects[i].siblings.next =
1943                                 (struct ylist_head *)(&newObjects[i + 1]);
1944         }
1945
1946         newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1947         dev->freeObjects = newObjects;
1948         dev->nFreeObjects += nObjects;
1949         dev->nObjectsCreated += nObjects;
1950
1951         /* Now add this bunch of Objects to a list for freeing up. */
1952
1953         list->objects = newObjects;
1954         list->next = dev->allocatedObjectList;
1955         dev->allocatedObjectList = list;
1956
1957         return YAFFS_OK;
1958 }
1959
1960
1961 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1962 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
1963 {
1964         yaffs_Object *tn = NULL;
1965
1966 #ifdef VALGRIND_TEST
1967         tn = YMALLOC(sizeof(yaffs_Object));
1968 #else
1969         /* If there are none left make more */
1970         if (!dev->freeObjects)
1971                 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1972
1973         if (dev->freeObjects) {
1974                 tn = dev->freeObjects;
1975                 dev->freeObjects =
1976                         (yaffs_Object *) (dev->freeObjects->siblings.next);
1977                 dev->nFreeObjects--;
1978         }
1979 #endif
1980         if (tn) {
1981                 /* Now sweeten it up... */
1982
1983                 memset(tn, 0, sizeof(yaffs_Object));
1984                 tn->beingCreated = 1;
1985
1986                 tn->myDev = dev;
1987                 tn->hdrChunk = 0;
1988                 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1989                 YINIT_LIST_HEAD(&(tn->hardLinks));
1990                 YINIT_LIST_HEAD(&(tn->hashLink));
1991                 YINIT_LIST_HEAD(&tn->siblings);
1992
1993
1994                 /* Now make the directory sane */
1995                 if (dev->rootDir) {
1996                         tn->parent = dev->rootDir;
1997                         ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
1998                 }
1999
2000                 /* Add it to the lost and found directory.
2001                  * NB Can't put root or lostNFound in lostNFound so
2002                  * check if lostNFound exists first
2003                  */
2004                 if (dev->lostNFoundDir)
2005                         yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
2006
2007                 tn->beingCreated = 0;
2008         }
2009
2010         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2011
2012         return tn;
2013 }
2014
2015 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
2016                                                __u32 mode)
2017 {
2018
2019         yaffs_Object *obj =
2020             yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
2021         if (obj) {
2022                 obj->fake = 1;          /* it is fake so it might have no NAND presence... */
2023                 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
2024                 obj->unlinkAllowed = 0; /* ... or unlink it */
2025                 obj->deleted = 0;
2026                 obj->unlinked = 0;
2027                 obj->yst_mode = mode;
2028                 obj->myDev = dev;
2029                 obj->hdrChunk = 0;      /* Not a valid chunk. */
2030         }
2031
2032         return obj;
2033
2034 }
2035
2036 static void yaffs_UnhashObject(yaffs_Object *tn)
2037 {
2038         int bucket;
2039         yaffs_Device *dev = tn->myDev;
2040
2041         /* If it is still linked into the bucket list, free from the list */
2042         if (!ylist_empty(&tn->hashLink)) {
2043                 ylist_del_init(&tn->hashLink);
2044                 bucket = yaffs_HashFunction(tn->objectId);
2045                 dev->objectBucket[bucket].count--;
2046         }
2047 }
2048
2049 /*  FreeObject frees up a Object and puts it back on the free list */
2050 static void yaffs_FreeObject(yaffs_Object *tn)
2051 {
2052         yaffs_Device *dev = tn->myDev;
2053
2054         T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
2055
2056         if (tn->parent)
2057                 YBUG();
2058         if (!ylist_empty(&tn->siblings))
2059                 YBUG();
2060
2061
2062         if (tn->myInode) {
2063                 /* We're still hooked up to a cached inode.
2064                  * Don't delete now, but mark for later deletion
2065                  */
2066                 tn->deferedFree = 1;
2067                 return;
2068         }
2069
2070         yaffs_UnhashObject(tn);
2071
2072 #ifdef VALGRIND_TEST
2073         YFREE(tn);
2074         tn = NULL;
2075 #else
2076         /* Link into the free list. */
2077         tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
2078         dev->freeObjects = tn;
2079         dev->nFreeObjects++;
2080 #endif
2081         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2082 }
2083
2084 #ifdef __KERNEL__
2085
2086 void yaffs_HandleDeferedFree(yaffs_Object *obj)
2087 {
2088         if (obj->deferedFree)
2089                 yaffs_FreeObject(obj);
2090 }
2091
2092 #endif
2093
2094 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
2095 {
2096         /* Free the list of allocated Objects */
2097
2098         yaffs_ObjectList *tmp;
2099
2100         while (dev->allocatedObjectList) {
2101                 tmp = dev->allocatedObjectList->next;
2102                 YFREE(dev->allocatedObjectList->objects);
2103                 YFREE(dev->allocatedObjectList);
2104
2105                 dev->allocatedObjectList = tmp;
2106         }
2107
2108         dev->freeObjects = NULL;
2109         dev->nFreeObjects = 0;
2110         dev->nObjectsCreated = 0;
2111 }
2112
2113 static void yaffs_InitialiseObjects(yaffs_Device *dev)
2114 {
2115         int i;
2116
2117         dev->allocatedObjectList = NULL;
2118         dev->freeObjects = NULL;
2119         dev->nFreeObjects = 0;
2120
2121         for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2122                 YINIT_LIST_HEAD(&dev->objectBucket[i].list);
2123                 dev->objectBucket[i].count = 0;
2124         }
2125 }
2126
2127 static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
2128 {
2129         static int x;
2130         int i;
2131         int l = 999;
2132         int lowest = 999999;
2133
2134         /* First let's see if we can find one that's empty. */
2135
2136         for (i = 0; i < 10 && lowest > 0; i++) {
2137                 x++;
2138                 x %= YAFFS_NOBJECT_BUCKETS;
2139                 if (dev->objectBucket[x].count < lowest) {
2140                         lowest = dev->objectBucket[x].count;
2141                         l = x;
2142                 }
2143
2144         }
2145
2146         /* If we didn't find an empty list, then try
2147          * looking a bit further for a short one
2148          */
2149
2150         for (i = 0; i < 10 && lowest > 3; i++) {
2151                 x++;
2152                 x %= YAFFS_NOBJECT_BUCKETS;
2153                 if (dev->objectBucket[x].count < lowest) {
2154                         lowest = dev->objectBucket[x].count;
2155                         l = x;
2156                 }
2157
2158         }
2159
2160         return l;
2161 }
2162
2163 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
2164 {
2165         int bucket = yaffs_FindNiceObjectBucket(dev);
2166
2167         /* Now find an object value that has not already been taken
2168          * by scanning the list.
2169          */
2170
2171         int found = 0;
2172         struct ylist_head *i;
2173
2174         __u32 n = (__u32) bucket;
2175
2176         /* yaffs_CheckObjectHashSanity();  */
2177
2178         while (!found) {
2179                 found = 1;
2180                 n += YAFFS_NOBJECT_BUCKETS;
2181                 if (1 || dev->objectBucket[bucket].count > 0) {
2182                         ylist_for_each(i, &dev->objectBucket[bucket].list) {
2183                                 /* If there is already one in the list */
2184                                 if (i && ylist_entry(i, yaffs_Object,
2185                                                 hashLink)->objectId == n) {
2186                                         found = 0;
2187                                 }
2188                         }
2189                 }
2190         }
2191
2192         return n;
2193 }
2194
2195 static void yaffs_HashObject(yaffs_Object *in)
2196 {
2197         int bucket = yaffs_HashFunction(in->objectId);
2198         yaffs_Device *dev = in->myDev;
2199
2200         ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
2201         dev->objectBucket[bucket].count++;
2202 }
2203
2204 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
2205 {
2206         int bucket = yaffs_HashFunction(number);
2207         struct ylist_head *i;
2208         yaffs_Object *in;
2209
2210         ylist_for_each(i, &dev->objectBucket[bucket].list) {
2211                 /* Look if it is in the list */
2212                 if (i) {
2213                         in = ylist_entry(i, yaffs_Object, hashLink);
2214                         if (in->objectId == number) {
2215 #ifdef __KERNEL__
2216                                 /* Don't tell the VFS about this one if it is defered free */
2217                                 if (in->deferedFree)
2218                                         return NULL;
2219 #endif
2220
2221                                 return in;
2222                         }
2223                 }
2224         }
2225
2226         return NULL;
2227 }
2228
2229 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
2230                                     yaffs_ObjectType type)
2231 {
2232         yaffs_Object *theObject;
2233         yaffs_Tnode *tn = NULL;
2234
2235         if (number < 0)
2236                 number = yaffs_CreateNewObjectNumber(dev);
2237
2238         if (type == YAFFS_OBJECT_TYPE_FILE) {
2239                 tn = yaffs_GetTnode(dev);
2240                 if (!tn)
2241                         return NULL;
2242         }
2243
2244         theObject = yaffs_AllocateEmptyObject(dev);
2245         if (!theObject){
2246                 if(tn)
2247                         yaffs_FreeTnode(dev,tn);
2248                 return NULL;
2249         }
2250
2251
2252         if (theObject) {
2253                 theObject->fake = 0;
2254                 theObject->renameAllowed = 1;
2255                 theObject->unlinkAllowed = 1;
2256                 theObject->objectId = number;
2257                 yaffs_HashObject(theObject);
2258                 theObject->variantType = type;
2259 #ifdef CONFIG_YAFFS_WINCE
2260                 yfsd_WinFileTimeNow(theObject->win_atime);
2261                 theObject->win_ctime[0] = theObject->win_mtime[0] =
2262                     theObject->win_atime[0];
2263                 theObject->win_ctime[1] = theObject->win_mtime[1] =
2264                     theObject->win_atime[1];
2265
2266 #else
2267
2268                 theObject->yst_atime = theObject->yst_mtime =
2269                     theObject->yst_ctime = Y_CURRENT_TIME;
2270 #endif
2271                 switch (type) {
2272                 case YAFFS_OBJECT_TYPE_FILE:
2273                         theObject->variant.fileVariant.fileSize = 0;
2274                         theObject->variant.fileVariant.scannedFileSize = 0;
2275                         theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2276                         theObject->variant.fileVariant.topLevel = 0;
2277                         theObject->variant.fileVariant.top = tn;
2278                         break;
2279                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2280                         YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2281                                         children);
2282                         break;
2283                 case YAFFS_OBJECT_TYPE_SYMLINK:
2284                 case YAFFS_OBJECT_TYPE_HARDLINK:
2285                 case YAFFS_OBJECT_TYPE_SPECIAL:
2286                         /* No action required */
2287                         break;
2288                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2289                         /* todo this should not happen */
2290                         break;
2291                 }
2292         }
2293
2294         return theObject;
2295 }
2296
2297 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
2298                                                       int number,
2299                                                       yaffs_ObjectType type)
2300 {
2301         yaffs_Object *theObject = NULL;
2302
2303         if (number > 0)
2304                 theObject = yaffs_FindObjectByNumber(dev, number);
2305
2306         if (!theObject)
2307                 theObject = yaffs_CreateNewObject(dev, number, type);
2308
2309         return theObject;
2310
2311 }
2312
2313
2314 static YCHAR *yaffs_CloneString(const YCHAR *str)
2315 {
2316         YCHAR *newStr = NULL;
2317         int len;
2318
2319         if (!str)
2320                 str = _Y("");
2321
2322         len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH);
2323         newStr = YMALLOC((len + 1) * sizeof(YCHAR));
2324         if (newStr){
2325                 yaffs_strncpy(newStr, str,len);
2326                 newStr[len] = 0;
2327         }
2328         return newStr;
2329
2330 }
2331
2332 /*
2333  * Mknod (create) a new object.
2334  * equivalentObject only has meaning for a hard link;
2335  * aliasString only has meaning for a symlink.
2336  * rdev only has meaning for devices (a subset of special objects)
2337  */
2338
2339 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2340                                        yaffs_Object *parent,
2341                                        const YCHAR *name,
2342                                        __u32 mode,
2343                                        __u32 uid,
2344                                        __u32 gid,
2345                                        yaffs_Object *equivalentObject,
2346                                        const YCHAR *aliasString, __u32 rdev)
2347 {
2348         yaffs_Object *in;
2349         YCHAR *str = NULL;
2350
2351         yaffs_Device *dev = parent->myDev;
2352
2353         /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2354         if (yaffs_FindObjectByName(parent, name))
2355                 return NULL;
2356
2357         if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2358                 str = yaffs_CloneString(aliasString);
2359                 if (!str)
2360                         return NULL;
2361         }
2362
2363         in = yaffs_CreateNewObject(dev, -1, type);
2364
2365         if (!in){
2366                 if(str)
2367                         YFREE(str);
2368                 return NULL;
2369         }
2370
2371
2372
2373
2374         if (in) {
2375                 in->hdrChunk = 0;
2376                 in->valid = 1;
2377                 in->variantType = type;
2378
2379                 in->yst_mode = mode;
2380
2381 #ifdef CONFIG_YAFFS_WINCE
2382                 yfsd_WinFileTimeNow(in->win_atime);
2383                 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2384                 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2385
2386 #else
2387                 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2388
2389                 in->yst_rdev = rdev;
2390                 in->yst_uid = uid;
2391                 in->yst_gid = gid;
2392 #endif
2393                 in->nDataChunks = 0;
2394
2395                 yaffs_SetObjectName(in, name);
2396                 in->dirty = 1;
2397
2398                 yaffs_AddObjectToDirectory(parent, in);
2399
2400                 in->myDev = parent->myDev;
2401
2402                 switch (type) {
2403                 case YAFFS_OBJECT_TYPE_SYMLINK:
2404                         in->variant.symLinkVariant.alias = str;
2405                         break;
2406                 case YAFFS_OBJECT_TYPE_HARDLINK:
2407                         in->variant.hardLinkVariant.equivalentObject =
2408                                 equivalentObject;
2409                         in->variant.hardLinkVariant.equivalentObjectId =
2410                                 equivalentObject->objectId;
2411                         ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
2412                         break;
2413                 case YAFFS_OBJECT_TYPE_FILE:
2414                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2415                 case YAFFS_OBJECT_TYPE_SPECIAL:
2416                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2417                         /* do nothing */
2418                         break;
2419                 }
2420
2421                 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2422                         /* Could not create the object header, fail the creation */
2423                         yaffs_DeleteObject(in);
2424                         in = NULL;
2425                 }
2426
2427                 yaffs_UpdateParent(parent);
2428         }
2429
2430         return in;
2431 }
2432
2433 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
2434                         __u32 mode, __u32 uid, __u32 gid)
2435 {
2436         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2437                                 uid, gid, NULL, NULL, 0);
2438 }
2439
2440 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
2441                                 __u32 mode, __u32 uid, __u32 gid)
2442 {
2443         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2444                                  mode, uid, gid, NULL, NULL, 0);
2445 }
2446
2447 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
2448                                 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2449 {
2450         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2451                                  uid, gid, NULL, NULL, rdev);
2452 }
2453
2454 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
2455                                 __u32 mode, __u32 uid, __u32 gid,
2456                                 const YCHAR *alias)
2457 {
2458         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2459                                 uid, gid, NULL, alias, 0);
2460 }
2461
2462 /* yaffs_Link returns the object id of the equivalent object.*/
2463 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
2464                         yaffs_Object *equivalentObject)
2465 {
2466         /* Get the real object in case we were fed a hard link as an equivalent object */
2467         equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2468
2469         if (yaffs_MknodObject
2470             (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2471              equivalentObject, NULL, 0)) {
2472                 return equivalentObject;
2473         } else {
2474                 return NULL;
2475         }
2476
2477 }
2478
2479 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
2480                                 const YCHAR *newName, int force, int shadows)
2481 {
2482         int unlinkOp;
2483         int deleteOp;
2484
2485         yaffs_Object *existingTarget;
2486
2487         if (newDir == NULL)
2488                 newDir = obj->parent;   /* use the old directory */
2489
2490         if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2491                 T(YAFFS_TRACE_ALWAYS,
2492                   (TSTR
2493                    ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
2494                     TENDSTR)));
2495                 YBUG();
2496         }
2497
2498         /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2499         if (obj->myDev->isYaffs2)
2500                 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2501         else
2502                 unlinkOp = (newDir == obj->myDev->unlinkedDir
2503                             && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2504
2505         deleteOp = (newDir == obj->myDev->deletedDir);
2506
2507         existingTarget = yaffs_FindObjectByName(newDir, newName);
2508
2509         /* If the object is a file going into the unlinked directory,
2510          *   then it is OK to just stuff it in since duplicate names are allowed.
2511          *   else only proceed if the new name does not exist and if we're putting
2512          *   it into a directory.
2513          */
2514         if ((unlinkOp ||
2515              deleteOp ||
2516              force ||
2517              (shadows > 0) ||
2518              !existingTarget) &&
2519             newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2520                 yaffs_SetObjectName(obj, newName);
2521                 obj->dirty = 1;
2522
2523                 yaffs_AddObjectToDirectory(newDir, obj);
2524
2525                 if (unlinkOp)
2526                         obj->unlinked = 1;
2527
2528                 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2529                 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
2530                         return YAFFS_OK;
2531         }
2532
2533         return YAFFS_FAIL;
2534 }
2535
2536 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
2537                 yaffs_Object *newDir, const YCHAR *newName)
2538 {
2539         yaffs_Object *obj = NULL;
2540         yaffs_Object *existingTarget = NULL;
2541         int force = 0;
2542         int result;
2543         yaffs_Device *dev;
2544
2545
2546         if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2547                 YBUG();
2548         if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2549                 YBUG();
2550
2551         dev = oldDir->myDev;
2552
2553 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2554         /* Special case for case insemsitive systems (eg. WinCE).
2555          * While look-up is case insensitive, the name isn't.
2556          * Therefore we might want to change x.txt to X.txt
2557         */
2558         if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
2559                 force = 1;
2560 #endif
2561
2562         if(yaffs_strnlen(newName,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH)
2563                 /* ENAMETOOLONG */
2564                 return YAFFS_FAIL;
2565
2566         obj = yaffs_FindObjectByName(oldDir, oldName);
2567
2568         if (obj && obj->renameAllowed) {
2569
2570                 /* Now do the handling for an existing target, if there is one */
2571
2572                 existingTarget = yaffs_FindObjectByName(newDir, newName);
2573                 if (existingTarget &&
2574                         existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2575                         !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
2576                         /* There is a target that is a non-empty directory, so we fail */
2577                         return YAFFS_FAIL;      /* EEXIST or ENOTEMPTY */
2578                 } else if (existingTarget && existingTarget != obj) {
2579                         /* Nuke the target first, using shadowing,
2580                          * but only if it isn't the same object.
2581                          *
2582                          * Note we must disable gc otherwise it can mess up the shadowing.
2583                          *
2584                          */
2585                         dev->isDoingGC=1;
2586                         yaffs_ChangeObjectName(obj, newDir, newName, force,
2587                                                 existingTarget->objectId);
2588                         existingTarget->isShadowed = 1;
2589                         yaffs_UnlinkObject(existingTarget);
2590                         dev->isDoingGC=0;
2591                 }
2592
2593                 result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2594
2595                 yaffs_UpdateParent(oldDir);
2596                 if(newDir != oldDir)
2597                         yaffs_UpdateParent(newDir);
2598
2599                 return result;
2600         }
2601         return YAFFS_FAIL;
2602 }
2603
2604 /*------------------------- Block Management and Page Allocation ----------------*/
2605
2606 static int yaffs_InitialiseBlocks(yaffs_Device *dev)
2607 {
2608         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2609
2610         dev->blockInfo = NULL;
2611         dev->chunkBits = NULL;
2612
2613         dev->allocationBlock = -1;      /* force it to get a new one */
2614
2615         /* If the first allocation strategy fails, thry the alternate one */
2616         dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2617         if (!dev->blockInfo) {
2618                 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2619                 dev->blockInfoAlt = 1;
2620         } else
2621                 dev->blockInfoAlt = 0;
2622
2623         if (dev->blockInfo) {
2624                 /* Set up dynamic blockinfo stuff. */
2625                 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
2626                 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2627                 if (!dev->chunkBits) {
2628                         dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2629                         dev->chunkBitsAlt = 1;
2630                 } else
2631                         dev->chunkBitsAlt = 0;
2632         }
2633
2634         if (dev->blockInfo && dev->chunkBits) {
2635                 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2636                 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2637                 return YAFFS_OK;
2638         }
2639
2640         return YAFFS_FAIL;
2641 }
2642
2643 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2644 {
2645         if (dev->blockInfoAlt && dev->blockInfo)
2646                 YFREE_ALT(dev->blockInfo);
2647         else if (dev->blockInfo)
2648                 YFREE(dev->blockInfo);
2649
2650         dev->blockInfoAlt = 0;
2651
2652         dev->blockInfo = NULL;
2653
2654         if (dev->chunkBitsAlt && dev->chunkBits)
2655                 YFREE_ALT(dev->chunkBits);
2656         else if (dev->chunkBits)
2657                 YFREE(dev->chunkBits);
2658         dev->chunkBitsAlt = 0;
2659         dev->chunkBits = NULL;
2660 }
2661
2662 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
2663                                         yaffs_BlockInfo *bi)
2664 {
2665         int i;
2666         __u32 seq;
2667         yaffs_BlockInfo *b;
2668
2669         if (!dev->isYaffs2)
2670                 return 1;       /* disqualification only applies to yaffs2. */
2671
2672         if (!bi->hasShrinkHeader)
2673                 return 1;       /* can gc */
2674
2675         /* Find the oldest dirty sequence number if we don't know it and save it
2676          * so we don't have to keep recomputing it.
2677          */
2678         if (!dev->oldestDirtySequence) {
2679                 seq = dev->sequenceNumber;
2680
2681                 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2682                                 i++) {
2683                         b = yaffs_GetBlockInfo(dev, i);
2684                         if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2685                             (b->pagesInUse - b->softDeletions) <
2686                             dev->nChunksPerBlock && b->sequenceNumber < seq) {
2687                                 seq = b->sequenceNumber;
2688                         }
2689                 }
2690                 dev->oldestDirtySequence = seq;
2691         }
2692
2693         /* Can't do gc of this block if there are any blocks older than this one that have
2694          * discarded pages.
2695          */
2696         return (bi->sequenceNumber <= dev->oldestDirtySequence);
2697 }
2698
2699 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
2700  * for garbage collection.
2701  */
2702
2703 static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
2704                                         int aggressive)
2705 {
2706         int b = dev->currentDirtyChecker;
2707
2708         int i;
2709         int iterations;
2710         int dirtiest = -1;
2711         int pagesInUse = 0;
2712         int prioritised = 0;
2713         yaffs_BlockInfo *bi;
2714         int pendingPrioritisedExist = 0;
2715
2716         /* First let's see if we need to grab a prioritised block */
2717         if (dev->hasPendingPrioritisedGCs) {
2718                 for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
2719
2720                         bi = yaffs_GetBlockInfo(dev, i);
2721                         /* yaffs_VerifyBlock(dev,bi,i); */
2722
2723                         if (bi->gcPrioritise) {
2724                                 pendingPrioritisedExist = 1;
2725                                 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2726                                    yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2727                                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2728                                         dirtiest = i;
2729                                         prioritised = 1;
2730                                         aggressive = 1; /* Fool the non-aggressive skip logiv below */
2731                                 }
2732                         }
2733                 }
2734
2735                 if (!pendingPrioritisedExist) /* None found, so we can clear this */
2736                         dev->hasPendingPrioritisedGCs = 0;
2737         }
2738
2739         /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2740          * search harder.
2741          * else (we're doing a leasurely gc), then we only bother to do this if the
2742          * block has only a few pages in use.
2743          */
2744
2745         dev->nonAggressiveSkip--;
2746
2747         if (!aggressive && (dev->nonAggressiveSkip > 0))
2748                 return -1;
2749
2750         if (!prioritised)
2751                 pagesInUse =
2752                         (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2753
2754         if (aggressive)
2755                 iterations =
2756                     dev->internalEndBlock - dev->internalStartBlock + 1;
2757         else {
2758                 iterations =
2759                     dev->internalEndBlock - dev->internalStartBlock + 1;
2760                 iterations = iterations / 16;
2761                 if (iterations > 200)
2762                         iterations = 200;
2763         }
2764
2765         for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2766                 b++;
2767                 if (b < dev->internalStartBlock || b > dev->internalEndBlock)
2768                         b = dev->internalStartBlock;
2769
2770                 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2771                         T(YAFFS_TRACE_ERROR,
2772                           (TSTR("**>> Block %d is not valid" TENDSTR), b));
2773                         YBUG();
2774                 }
2775
2776                 bi = yaffs_GetBlockInfo(dev, b);
2777
2778                 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2779                         (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2780                                 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2781                         dirtiest = b;
2782                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2783                 }
2784         }
2785
2786         dev->currentDirtyChecker = b;
2787
2788         if (dirtiest > 0) {
2789                 T(YAFFS_TRACE_GC,
2790                   (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2791                    dev->nChunksPerBlock - pagesInUse, prioritised));
2792         }
2793
2794         dev->oldestDirtySequence = 0;
2795
2796         if (dirtiest > 0)
2797                 dev->nonAggressiveSkip = 4;
2798
2799         return dirtiest;
2800 }
2801
2802 static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
2803 {
2804         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2805
2806         int erasedOk = 0;
2807
2808         /* If the block is still healthy erase it and mark as clean.
2809          * If the block has had a data failure, then retire it.
2810          */
2811
2812         T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2813                 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2814                 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2815
2816         bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2817
2818         if (!bi->needsRetiring) {
2819                 yaffs_InvalidateCheckpoint(dev);
2820                 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2821                 if (!erasedOk) {
2822                         dev->nErasureFailures++;
2823                         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2824                           (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2825                 }
2826         }
2827
2828         if (erasedOk &&
2829             ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2830                 int i;
2831                 for (i = 0; i < dev->nChunksPerBlock; i++) {
2832                         if (!yaffs_CheckChunkErased
2833                             (dev, blockNo * dev->nChunksPerBlock + i)) {
2834                                 T(YAFFS_TRACE_ERROR,
2835                                   (TSTR
2836                                    (">>Block %d erasure supposedly OK, but chunk %d not erased"
2837                                     TENDSTR), blockNo, i));
2838                         }
2839                 }
2840         }
2841
2842         if (erasedOk) {
2843                 /* Clean it up... */
2844                 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2845                 dev->nErasedBlocks++;
2846                 bi->pagesInUse = 0;
2847                 bi->softDeletions = 0;
2848                 bi->hasShrinkHeader = 0;
2849                 bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
2850                 bi->gcPrioritise = 0;
2851                 yaffs_ClearChunkBits(dev, blockNo);
2852
2853                 T(YAFFS_TRACE_ERASE,
2854                   (TSTR("Erased block %d" TENDSTR), blockNo));
2855         } else {
2856                 dev->nFreeChunks -= dev->nChunksPerBlock;       /* We lost a block of free space */
2857
2858                 yaffs_RetireBlock(dev, blockNo);
2859                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2860                   (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2861         }
2862 }
2863
2864 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2865 {
2866         int i;
2867
2868         yaffs_BlockInfo *bi;
2869
2870         if (dev->nErasedBlocks < 1) {
2871                 /* Hoosterman we've got a problem.
2872                  * Can't get space to gc
2873                  */
2874                 T(YAFFS_TRACE_ERROR,
2875                   (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
2876
2877                 return -1;
2878         }
2879
2880         /* Find an empty block. */
2881
2882         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2883                 dev->allocationBlockFinder++;
2884                 if (dev->allocationBlockFinder < dev->internalStartBlock
2885                     || dev->allocationBlockFinder > dev->internalEndBlock) {
2886                         dev->allocationBlockFinder = dev->internalStartBlock;
2887                 }
2888
2889                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2890
2891                 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2892                         bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2893                         dev->sequenceNumber++;
2894                         bi->sequenceNumber = dev->sequenceNumber;
2895                         dev->nErasedBlocks--;
2896                         T(YAFFS_TRACE_ALLOCATE,
2897                           (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
2898                            dev->allocationBlockFinder, dev->sequenceNumber,
2899                            dev->nErasedBlocks));
2900                         return dev->allocationBlockFinder;
2901                 }
2902         }
2903
2904         T(YAFFS_TRACE_ALWAYS,
2905           (TSTR
2906            ("yaffs tragedy: no more erased blocks, but there should have been %d"
2907             TENDSTR), dev->nErasedBlocks));
2908
2909         return -1;
2910 }
2911
2912
2913
2914 static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
2915 {
2916         if (!dev->nCheckpointBlocksRequired &&
2917            dev->isYaffs2) {
2918                 /* Not a valid value so recalculate */
2919                 int nBytes = 0;
2920                 int nBlocks;
2921                 int devBlocks = (dev->endBlock - dev->startBlock + 1);
2922                 int tnodeSize;
2923
2924                 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
2925
2926                 if (tnodeSize < sizeof(yaffs_Tnode))
2927                         tnodeSize = sizeof(yaffs_Tnode);
2928
2929                 nBytes += sizeof(yaffs_CheckpointValidity);
2930                 nBytes += sizeof(yaffs_CheckpointDevice);
2931                 nBytes += devBlocks * sizeof(yaffs_BlockInfo);
2932                 nBytes += devBlocks * dev->chunkBitmapStride;
2933                 nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
2934                 nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
2935                 nBytes += sizeof(yaffs_CheckpointValidity);
2936                 nBytes += sizeof(__u32); /* checksum*/
2937
2938                 /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
2939
2940                 nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->nChunksPerBlock)) + 3;
2941
2942                 dev->nCheckpointBlocksRequired = nBlocks;
2943         }
2944
2945         return dev->nCheckpointBlocksRequired;
2946 }
2947
2948 /*
2949  * Check if there's space to allocate...
2950  * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2951  */
2952 static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev)
2953 {
2954         int reservedChunks;
2955         int reservedBlocks = dev->nReservedBlocks;
2956         int checkpointBlocks;
2957
2958         if (dev->isYaffs2) {
2959                 checkpointBlocks =  yaffs_CalcCheckpointBlocksRequired(dev) -
2960                                     dev->blocksInCheckpoint;
2961                 if (checkpointBlocks < 0)
2962                         checkpointBlocks = 0;
2963         } else {
2964                 checkpointBlocks = 0;
2965         }
2966
2967         reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
2968
2969         return (dev->nFreeChunks > reservedChunks);
2970 }
2971
2972 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
2973                 yaffs_BlockInfo **blockUsedPtr)
2974 {
2975         int retVal;
2976         yaffs_BlockInfo *bi;
2977
2978         if (dev->allocationBlock < 0) {
2979                 /* Get next block to allocate off */
2980                 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2981                 dev->allocationPage = 0;
2982         }
2983
2984         if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2985                 /* Not enough space to allocate unless we're allowed to use the reserve. */
2986                 return -1;
2987         }
2988
2989         if (dev->nErasedBlocks < dev->nReservedBlocks
2990                         && dev->allocationPage == 0) {
2991                 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2992         }
2993
2994         /* Next page please.... */
2995         if (dev->allocationBlock >= 0) {
2996                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2997
2998                 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2999                         dev->allocationPage;
3000                 bi->pagesInUse++;
3001                 yaffs_SetChunkBit(dev, dev->allocationBlock,
3002                                 dev->allocationPage);
3003
3004                 dev->allocationPage++;
3005
3006                 dev->nFreeChunks--;
3007
3008                 /* If the block is full set the state to full */
3009                 if (dev->allocationPage >= dev->nChunksPerBlock) {
3010                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
3011                         dev->allocationBlock = -1;
3012                 }
3013
3014                 if (blockUsedPtr)
3015                         *blockUsedPtr = bi;
3016
3017                 return retVal;
3018         }
3019
3020         T(YAFFS_TRACE_ERROR,
3021                         (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
3022
3023         return -1;
3024 }
3025
3026 static int yaffs_GetErasedChunks(yaffs_Device *dev)
3027 {
3028         int n;
3029
3030         n = dev->nErasedBlocks * dev->nChunksPerBlock;
3031
3032         if (dev->allocationBlock > 0)
3033                 n += (dev->nChunksPerBlock - dev->allocationPage);
3034
3035         return n;
3036
3037 }
3038
3039 /*
3040  * yaffs_SkipRestOfBlock() skips over the rest of the allocation block
3041  * if we don't want to write to it.
3042  */
3043 static void yaffs_SkipRestOfBlock(yaffs_Device *dev)
3044 {
3045         if(dev->allocationBlock > 0){
3046                 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3047                 if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){
3048                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
3049                         dev->allocationBlock = -1;
3050                 }
3051         }
3052 }
3053
3054
3055 static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
3056                 int wholeBlock)
3057 {
3058         int oldChunk;
3059         int newChunk;
3060         int markNAND;
3061         int retVal = YAFFS_OK;
3062         int cleanups = 0;
3063         int i;
3064         int isCheckpointBlock;
3065         int matchingChunk;
3066         int maxCopies;
3067
3068         int chunksBefore = yaffs_GetErasedChunks(dev);
3069         int chunksAfter;
3070
3071         yaffs_ExtendedTags tags;
3072
3073         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
3074
3075         yaffs_Object *object;
3076
3077         isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
3078
3079
3080         T(YAFFS_TRACE_TRACING,
3081                         (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
3082                          block,
3083                          bi->pagesInUse,
3084                          bi->hasShrinkHeader,
3085                          wholeBlock));
3086
3087         /*yaffs_VerifyFreeChunks(dev); */
3088
3089         if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
3090                 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
3091
3092         bi->hasShrinkHeader = 0;        /* clear the flag so that the block can erase */
3093
3094         /* Take off the number of soft deleted entries because
3095          * they're going to get really deleted during GC.
3096          */
3097         if(dev->gcChunk == 0) /* first time through for this block */
3098                 dev->nFreeChunks -= bi->softDeletions;
3099
3100         dev->isDoingGC = 1;
3101
3102         if (isCheckpointBlock ||
3103                         !yaffs_StillSomeChunkBits(dev, block)) {
3104                 T(YAFFS_TRACE_TRACING,
3105                                 (TSTR
3106                                  ("Collecting block %d that has no chunks in use" TENDSTR),
3107                                  block));
3108                 yaffs_BlockBecameDirty(dev, block);
3109         } else {
3110
3111                 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
3112
3113                 yaffs_VerifyBlock(dev, bi, block);
3114
3115                 maxCopies = (wholeBlock) ? dev->nChunksPerBlock : 10;
3116                 oldChunk = block * dev->nChunksPerBlock + dev->gcChunk;
3117
3118                 for (/* init already done */;
3119                      retVal == YAFFS_OK &&
3120                      dev->gcChunk < dev->nChunksPerBlock &&
3121                      (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
3122                      maxCopies > 0;
3123                      dev->gcChunk++, oldChunk++) {
3124                         if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
3125
3126                                 /* This page is in use and might need to be copied off */
3127
3128                                 maxCopies--;
3129
3130                                 markNAND = 1;
3131
3132                                 yaffs_InitialiseTags(&tags);
3133
3134                                 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
3135                                                                 buffer, &tags);
3136
3137                                 object =
3138                                     yaffs_FindObjectByNumber(dev,
3139                                                              tags.objectId);
3140
3141                                 T(YAFFS_TRACE_GC_DETAIL,
3142                                   (TSTR
3143                                    ("Collecting chunk in block %d, %d %d %d " TENDSTR),
3144                                    dev->gcChunk, tags.objectId, tags.chunkId,
3145                                    tags.byteCount));
3146
3147                                 if (object && !yaffs_SkipVerification(dev)) {
3148                                         if (tags.chunkId == 0)
3149                                                 matchingChunk = object->hdrChunk;
3150                                         else if (object->softDeleted)
3151                                                 matchingChunk = oldChunk; /* Defeat the test */
3152                                         else
3153                                                 matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
3154
3155                                         if (oldChunk != matchingChunk)
3156                                                 T(YAFFS_TRACE_ERROR,
3157                                                   (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
3158                                                   oldChunk, matchingChunk, tags.objectId, tags.chunkId));
3159
3160                                 }
3161
3162                                 if (!object) {
3163                                         T(YAFFS_TRACE_ERROR,
3164                                           (TSTR
3165                                            ("page %d in gc has no object: %d %d %d "
3166                                             TENDSTR), oldChunk,
3167                                             tags.objectId, tags.chunkId, tags.byteCount));
3168                                 }
3169
3170                                 if (object &&
3171                                     object->deleted &&
3172                                     object->softDeleted &&
3173                                     tags.chunkId != 0) {
3174                                         /* Data chunk in a soft deleted file, throw it away
3175                                          * It's a soft deleted data chunk,
3176                                          * No need to copy this, just forget about it and
3177                                          * fix up the object.
3178                                          */
3179
3180                                         object->nDataChunks--;
3181
3182                                         if (object->nDataChunks <= 0) {
3183                                                 /* remeber to clean up the object */
3184                                                 dev->gcCleanupList[cleanups] =
3185                                                     tags.objectId;
3186                                                 cleanups++;
3187                                         }
3188                                         markNAND = 0;
3189                                 } else if (0) {
3190                                         /* Todo object && object->deleted && object->nDataChunks == 0 */
3191                                         /* Deleted object header with no data chunks.
3192                                          * Can be discarded and the file deleted.
3193                                          */
3194                                         object->hdrChunk = 0;
3195                                         yaffs_FreeTnode(object->myDev,
3196                                                         object->variant.
3197                                                         fileVariant.top);
3198                                         object->variant.fileVariant.top = NULL;
3199                                         yaffs_DoGenericObjectDeletion(object);
3200
3201                                 } else if (object) {
3202                                         /* It's either a data chunk in a live file or
3203                                          * an ObjectHeader, so we're interested in it.
3204                                          * NB Need to keep the ObjectHeaders of deleted files
3205                                          * until the whole file has been deleted off
3206                                          */
3207                                         tags.serialNumber++;
3208
3209                                         dev->nGCCopies++;
3210
3211                                         if (tags.chunkId == 0) {
3212                                                 /* It is an object Id,
3213                                                  * We need to nuke the shrinkheader flags first
3214                                                  * Also need to clean up shadowing.
3215                                                  * We no longer want the shrinkHeader flag since its work is done
3216                                                  * and if it is left in place it will mess up scanning.
3217                                                  */
3218
3219                                                 yaffs_ObjectHeader *oh;
3220                                                 oh = (yaffs_ObjectHeader *)buffer;
3221                                                 oh->isShrink = 0;
3222                                                 tags.extraIsShrinkHeader = 0;
3223                                                 oh->shadowsObject = 0;
3224                                                 oh->inbandShadowsObject = 0;
3225                                                 tags.extraShadows = 0;
3226
3227                                                 yaffs_VerifyObjectHeader(object, oh, &tags, 1);
3228                                         }
3229
3230                                         newChunk =
3231                                             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3232
3233                                         if (newChunk < 0) {
3234                                                 retVal = YAFFS_FAIL;
3235                                         } else {
3236
3237                                                 /* Ok, now fix up the Tnodes etc. */
3238
3239                                                 if (tags.chunkId == 0) {
3240                                                         /* It's a header */
3241                                                         object->hdrChunk =  newChunk;
3242                                                         object->serial =   tags.serialNumber;
3243                                                 } else {
3244                                                         /* It's a data chunk */
3245                                                         yaffs_PutChunkIntoFile
3246                                                             (object,
3247                                                              tags.chunkId,
3248                                                              newChunk, 0);
3249                                                 }
3250                                         }
3251                                 }
3252
3253                                 if (retVal == YAFFS_OK)
3254                                         yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3255
3256                         }
3257                 }
3258
3259                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3260
3261
3262                 /* Do any required cleanups */
3263                 for (i = 0; i < cleanups; i++) {
3264                         /* Time to delete the file too */
3265                         object =
3266                             yaffs_FindObjectByNumber(dev,
3267                                                      dev->gcCleanupList[i]);
3268                         if (object) {
3269                                 yaffs_FreeTnode(dev,
3270                                                 object->variant.fileVariant.
3271                                                 top);
3272                                 object->variant.fileVariant.top = NULL;
3273                                 T(YAFFS_TRACE_GC,
3274                                   (TSTR
3275                                    ("yaffs: About to finally delete object %d"
3276                                     TENDSTR), object->objectId));
3277                                 yaffs_DoGenericObjectDeletion(object);
3278                                 object->myDev->nDeletedFiles--;
3279                         }
3280
3281                 }
3282
3283         }
3284
3285         yaffs_VerifyCollectedBlock(dev, bi, block);
3286
3287         chunksAfter = yaffs_GetErasedChunks(dev);
3288         if (chunksBefore >= chunksAfter) {
3289                 T(YAFFS_TRACE_GC,
3290                   (TSTR
3291                    ("gc did not increase free chunks before %d after %d"
3292                     TENDSTR), chunksBefore, chunksAfter));
3293         }
3294
3295         /* If the gc completed then clear the current gcBlock so that we find another. */
3296         if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
3297                 dev->gcBlock = -1;
3298                 dev->gcChunk = 0;
3299         }
3300
3301         dev->isDoingGC = 0;
3302
3303         return retVal;
3304 }
3305
3306 /* New garbage collector
3307  * If we're very low on erased blocks then we do aggressive garbage collection
3308  * otherwise we do "leasurely" garbage collection.
3309  * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3310  * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3311  *
3312  * The idea is to help clear out space in a more spread-out manner.
3313  * Dunno if it really does anything useful.
3314  */
3315 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
3316 {
3317         int block;
3318         int aggressive;
3319         int gcOk = YAFFS_OK;
3320         int maxTries = 0;
3321
3322         int checkpointBlockAdjust;
3323
3324         if (dev->isDoingGC) {
3325                 /* Bail out so we don't get recursive gc */
3326                 return YAFFS_OK;
3327         }
3328
3329         /* This loop should pass the first time.
3330          * We'll only see looping here if the erase of the collected block fails.
3331          */
3332
3333         do {
3334                 maxTries++;
3335
3336                 checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
3337                 if (checkpointBlockAdjust < 0)
3338                         checkpointBlockAdjust = 0;
3339
3340                 if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
3341                         /* We need a block soon...*/
3342                         aggressive = 1;
3343                 } else {
3344                         /* We're in no hurry */
3345                         aggressive = 0;
3346                 }
3347
3348                 if (dev->gcBlock <= 0) {
3349                         dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3350                         dev->gcChunk = 0;
3351                 }
3352
3353                 block = dev->gcBlock;
3354
3355                 if (block > 0) {
3356                         dev->garbageCollections++;
3357                         if (!aggressive)
3358                                 dev->passiveGarbageCollections++;
3359
3360                         T(YAFFS_TRACE_GC,
3361                           (TSTR
3362                            ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3363                            dev->nErasedBlocks, aggressive));
3364
3365                         gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
3366                 }
3367
3368                 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
3369                         T(YAFFS_TRACE_GC,
3370                           (TSTR
3371                            ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3372                             TENDSTR), dev->nErasedBlocks, maxTries, block));
3373                 }
3374         } while ((dev->nErasedBlocks < dev->nReservedBlocks) &&
3375                  (block > 0) &&
3376                  (maxTries < 2));
3377
3378         return aggressive ? gcOk : YAFFS_OK;
3379 }
3380
3381 /*-------------------------  TAGS --------------------------------*/
3382
3383 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
3384                            int chunkInObject)
3385 {
3386         return (tags->chunkId == chunkInObject &&
3387                 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3388
3389 }
3390
3391
3392 /*-------------------- Data file manipulation -----------------*/
3393
3394 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
3395                                  yaffs_ExtendedTags *tags)
3396 {
3397         /*Get the Tnode, then get the level 0 offset chunk offset */
3398         yaffs_Tnode *tn;
3399         int theChunk = -1;
3400         yaffs_ExtendedTags localTags;
3401         int retVal = -1;
3402
3403         yaffs_Device *dev = in->myDev;
3404
3405         if (!tags) {
3406                 /* Passed a NULL, so use our own tags space */
3407                 tags = &localTags;
3408         }
3409
3410         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3411
3412         if (tn) {
3413                 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3414
3415                 retVal =
3416                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3417                                            chunkInInode);
3418         }
3419         return retVal;
3420 }
3421
3422 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
3423                                           yaffs_ExtendedTags *tags)
3424 {
3425         /* Get the Tnode, then get the level 0 offset chunk offset */
3426         yaffs_Tnode *tn;
3427         int theChunk = -1;
3428         yaffs_ExtendedTags localTags;
3429
3430         yaffs_Device *dev = in->myDev;
3431         int retVal = -1;
3432
3433         if (!tags) {
3434                 /* Passed a NULL, so use our own tags space */
3435                 tags = &localTags;
3436         }
3437
3438         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3439
3440         if (tn) {
3441
3442                 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3443
3444                 retVal =
3445                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3446                                            chunkInInode);
3447
3448                 /* Delete the entry in the filestructure (if found) */
3449                 if (retVal != -1)
3450                         yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0);
3451         }
3452
3453         return retVal;
3454 }
3455
3456 #ifdef YAFFS_PARANOID
3457
3458 static int yaffs_CheckFileSanity(yaffs_Object *in)
3459 {
3460         int chunk;
3461         int nChunks;
3462         int fSize;
3463         int failed = 0;
3464         int objId;
3465         yaffs_Tnode *tn;
3466         yaffs_Tags localTags;
3467         yaffs_Tags *tags = &localTags;
3468         int theChunk;
3469         int chunkDeleted;
3470
3471         if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
3472                 return YAFFS_FAIL;
3473
3474         objId = in->objectId;
3475         fSize = in->variant.fileVariant.fileSize;
3476         nChunks =
3477             (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3478
3479         for (chunk = 1; chunk <= nChunks; chunk++) {
3480                 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3481                                            chunk);
3482
3483                 if (tn) {
3484
3485                         theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
3486
3487                         if (yaffs_CheckChunkBits
3488                             (dev, theChunk / dev->nChunksPerBlock,
3489                              theChunk % dev->nChunksPerBlock)) {
3490
3491                                 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3492                                                             tags,
3493                                                             &chunkDeleted);
3494                                 if (yaffs_TagsMatch
3495                                     (tags, in->objectId, chunk, chunkDeleted)) {
3496                                         /* found it; */
3497
3498                                 }
3499                         } else {
3500
3501                                 failed = 1;
3502                         }
3503
3504                 } else {
3505                         /* T(("No level 0 found for %d\n", chunk)); */
3506                 }
3507         }
3508
3509         return failed ? YAFFS_FAIL : YAFFS_OK;
3510 }
3511
3512 #endif
3513
3514 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
3515                                   int chunkInNAND, int inScan)
3516 {
3517         /* NB inScan is zero unless scanning.
3518          * For forward scanning, inScan is > 0;
3519          * for backward scanning inScan is < 0
3520          *
3521          * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there.
3522          */
3523
3524         yaffs_Tnode *tn;
3525         yaffs_Device *dev = in->myDev;
3526         int existingChunk;
3527         yaffs_ExtendedTags existingTags;
3528         yaffs_ExtendedTags newTags;
3529         unsigned existingSerial, newSerial;
3530
3531         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3532                 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3533                  * If it is not during Scanning then something went wrong!
3534                  */
3535                 if (!inScan) {
3536                         T(YAFFS_TRACE_ERROR,
3537                           (TSTR
3538                            ("yaffs tragedy:attempt to put data chunk into a non-file"
3539                             TENDSTR)));
3540                         YBUG();
3541                 }
3542
3543                 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3544                 return YAFFS_OK;
3545         }
3546
3547         tn = yaffs_AddOrFindLevel0Tnode(dev,
3548                                         &in->variant.fileVariant,
3549                                         chunkInInode,
3550                                         NULL);
3551         if (!tn)
3552                 return YAFFS_FAIL;
3553
3554         if(!chunkInNAND)
3555                 /* Dummy insert, bail now */
3556                 return YAFFS_OK;
3557
3558
3559         existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3560
3561         if (inScan != 0) {
3562                 /* If we're scanning then we need to test for duplicates
3563                  * NB This does not need to be efficient since it should only ever
3564                  * happen when the power fails during a write, then only one
3565                  * chunk should ever be affected.
3566                  *
3567                  * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3568                  * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3569                  */
3570
3571                 if (existingChunk > 0) {
3572                         /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3573                          *    thus we have to do a FindChunkInFile to get the real chunk id.
3574                          *
3575                          * We have a duplicate now we need to decide which one to use:
3576                          *
3577                          * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3578                          * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3579                          * YAFFS1: Get both sets of tags and compare serial numbers.
3580                          */
3581
3582                         if (inScan > 0) {
3583                                 /* Only do this for forward scanning */
3584                                 yaffs_ReadChunkWithTagsFromNAND(dev,
3585                                                                 chunkInNAND,
3586                                                                 NULL, &newTags);
3587
3588                                 /* Do a proper find */
3589                                 existingChunk =
3590                                     yaffs_FindChunkInFile(in, chunkInInode,
3591                                                           &existingTags);
3592                         }
3593
3594                         if (existingChunk <= 0) {
3595                                 /*Hoosterman - how did this happen? */
3596
3597                                 T(YAFFS_TRACE_ERROR,
3598                                   (TSTR
3599                                    ("yaffs tragedy: existing chunk < 0 in scan"
3600                                     TENDSTR)));
3601
3602                         }
3603
3604                         /* NB The deleted flags should be false, otherwise the chunks will
3605                          * not be loaded during a scan
3606                          */
3607
3608                         if (inScan > 0) {
3609                                 newSerial = newTags.serialNumber;
3610                                 existingSerial = existingTags.serialNumber;
3611                         }
3612
3613                         if ((inScan > 0) &&
3614                             (in->myDev->isYaffs2 ||
3615                              existingChunk <= 0 ||
3616                              ((existingSerial + 1) & 3) == newSerial)) {
3617                                 /* Forward scanning.
3618                                  * Use new
3619                                  * Delete the old one and drop through to update the tnode
3620                                  */
3621                                 yaffs_DeleteChunk(dev, existingChunk, 1,
3622                                                   __LINE__);
3623                         } else {
3624                                 /* Backward scanning or we want to use the existing one
3625                                  * Use existing.
3626                                  * Delete the new one and return early so that the tnode isn't changed
3627                                  */
3628                                 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3629                                                   __LINE__);
3630                                 return YAFFS_OK;
3631                         }
3632                 }
3633
3634         }
3635
3636         if (existingChunk == 0)
3637                 in->nDataChunks++;
3638
3639         yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
3640
3641         return YAFFS_OK;
3642 }
3643
3644 static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
3645                                         __u8 *buffer)
3646 {
3647         int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3648
3649         if (chunkInNAND >= 0)
3650                 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3651                                                 buffer, NULL);
3652         else {
3653                 T(YAFFS_TRACE_NANDACCESS,
3654                   (TSTR("Chunk %d not found zero instead" TENDSTR),
3655                    chunkInNAND));
3656                 /* get sane (zero) data if you read a hole */
3657                 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3658                 return 0;
3659         }
3660
3661 }
3662
3663 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
3664 {
3665         int block;
3666         int page;
3667         yaffs_ExtendedTags tags;
3668         yaffs_BlockInfo *bi;
3669
3670         if (chunkId <= 0)
3671                 return;
3672
3673         dev->nDeletions++;
3674         block = chunkId / dev->nChunksPerBlock;
3675         page = chunkId % dev->nChunksPerBlock;
3676
3677
3678         if (!yaffs_CheckChunkBit(dev, block, page))
3679                 T(YAFFS_TRACE_VERIFY,
3680                         (TSTR("Deleting invalid chunk %d"TENDSTR),
3681                          chunkId));
3682
3683         bi = yaffs_GetBlockInfo(dev, block);
3684
3685         T(YAFFS_TRACE_DELETION,
3686           (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3687
3688         if (markNAND &&
3689             bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
3690
3691                 yaffs_InitialiseTags(&tags);
3692
3693                 tags.chunkDeleted = 1;
3694
3695                 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3696                 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3697         } else {
3698                 dev->nUnmarkedDeletions++;
3699         }
3700
3701         /* Pull out of the management area.
3702          * If the whole block became dirty, this will kick off an erasure.
3703          */
3704         if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3705             bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3706             bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3707             bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3708                 dev->nFreeChunks++;
3709
3710                 yaffs_ClearChunkBit(dev, block, page);
3711
3712                 bi->pagesInUse--;
3713
3714                 if (bi->pagesInUse == 0 &&
3715                     !bi->hasShrinkHeader &&
3716                     bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3717                     bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3718                         yaffs_BlockBecameDirty(dev, block);
3719                 }
3720
3721         }
3722
3723 }
3724
3725 static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
3726                                         const __u8 *buffer, int nBytes,
3727                                         int useReserve)
3728 {
3729         /* Find old chunk Need to do this to get serial number
3730          * Write new one and patch into tree.
3731          * Invalidate old tags.
3732          */
3733
3734         int prevChunkId;
3735         yaffs_ExtendedTags prevTags;
3736
3737         int newChunkId;
3738         yaffs_ExtendedTags newTags;
3739
3740         yaffs_Device *dev = in->myDev;
3741
3742         yaffs_CheckGarbageCollection(dev);
3743
3744         /* Get the previous chunk at this location in the file if it exists */
3745         prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3746
3747         /* Set up new tags */
3748         yaffs_InitialiseTags(&newTags);
3749
3750         newTags.chunkId = chunkInInode;
3751         newTags.objectId = in->objectId;
3752         newTags.serialNumber =
3753             (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
3754         newTags.byteCount = nBytes;
3755
3756         if (nBytes < 1 || nBytes > dev->totalBytesPerChunk) {
3757                 T(YAFFS_TRACE_ERROR,
3758                 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
3759                 YBUG();
3760         }
3761
3762         /*
3763          * If there isn't already a chunk there then do a dummy
3764          * insert to make sue we have the desired tnode structure.
3765          */
3766         if(prevChunkId < 1 &&
3767                 yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0) != YAFFS_OK)
3768                 return -1;
3769
3770         newChunkId =
3771             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3772                                               useReserve);
3773
3774         if (newChunkId > 0) {
3775                 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3776
3777                 if (prevChunkId > 0)
3778                         yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3779
3780                 yaffs_CheckFileSanity(in);
3781         }
3782         return newChunkId;
3783
3784 }
3785
3786 /* UpdateObjectHeader updates the header on NAND for an object.
3787  * If name is not NULL, then that new name is used.
3788  */
3789 int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
3790                              int isShrink, int shadows)
3791 {
3792
3793         yaffs_BlockInfo *bi;
3794
3795         yaffs_Device *dev = in->myDev;
3796
3797         int prevChunkId;
3798         int retVal = 0;
3799         int result = 0;
3800
3801         int newChunkId;
3802         yaffs_ExtendedTags newTags;
3803         yaffs_ExtendedTags oldTags;
3804         YCHAR *alias = NULL;
3805
3806         __u8 *buffer = NULL;
3807         YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3808
3809         yaffs_ObjectHeader *oh = NULL;
3810
3811         yaffs_strcpy(oldName, _Y("silly old name"));
3812
3813
3814         if (!in->fake ||
3815                 in == dev->rootDir || /* The rootDir should also be saved */
3816                 force) {
3817
3818                 yaffs_CheckGarbageCollection(dev);
3819                 yaffs_CheckObjectDetailsLoaded(in);
3820
3821                 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3822                 oh = (yaffs_ObjectHeader *) buffer;
3823
3824                 prevChunkId = in->hdrChunk;
3825
3826                 if (prevChunkId > 0) {
3827                         result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3828                                                         buffer, &oldTags);
3829
3830                         yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
3831
3832                         memcpy(oldName, oh->name, sizeof(oh->name));
3833                 }
3834
3835                 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3836
3837                 oh->type = in->variantType;
3838                 oh->yst_mode = in->yst_mode;
3839                 oh->shadowsObject = oh->inbandShadowsObject = shadows;
3840
3841 #ifdef CONFIG_YAFFS_WINCE
3842                 oh->win_atime[0] = in->win_atime[0];
3843                 oh->win_ctime[0] = in->win_ctime[0];
3844                 oh->win_mtime[0] = in->win_mtime[0];
3845                 oh->win_atime[1] = in->win_atime[1];
3846                 oh->win_ctime[1] = in->win_ctime[1];
3847                 oh->win_mtime[1] = in->win_mtime[1];
3848 #else
3849                 oh->yst_uid = in->yst_uid;
3850                 oh->yst_gid = in->yst_gid;
3851                 oh->yst_atime = in->yst_atime;
3852                 oh->yst_mtime = in->yst_mtime;
3853                 oh->yst_ctime = in->yst_ctime;
3854                 oh->yst_rdev = in->yst_rdev;
3855 #endif
3856                 if (in->parent)
3857                         oh->parentObjectId = in->parent->objectId;
3858                 else
3859                         oh->parentObjectId = 0;
3860
3861                 if (name && *name) {
3862                         memset(oh->name, 0, sizeof(oh->name));
3863                         yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3864                 } else if (prevChunkId > 0)
3865                         memcpy(oh->name, oldName, sizeof(oh->name));
3866                 else
3867                         memset(oh->name, 0, sizeof(oh->name));
3868
3869                 oh->isShrink = isShrink;
3870
3871                 switch (in->variantType) {
3872                 case YAFFS_OBJECT_TYPE_UNKNOWN:
3873                         /* Should not happen */
3874                         break;
3875                 case YAFFS_OBJECT_TYPE_FILE:
3876                         oh->fileSize =
3877                             (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3878                              || oh->parentObjectId ==
3879                              YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3880                             fileVariant.fileSize;
3881                         break;
3882                 case YAFFS_OBJECT_TYPE_HARDLINK:
3883                         oh->equivalentObjectId =
3884                             in->variant.hardLinkVariant.equivalentObjectId;
3885                         break;
3886                 case YAFFS_OBJECT_TYPE_SPECIAL:
3887                         /* Do nothing */
3888                         break;
3889                 case YAFFS_OBJECT_TYPE_DIRECTORY:
3890                         /* Do nothing */
3891                         break;
3892                 case YAFFS_OBJECT_TYPE_SYMLINK:
3893                         alias = in->variant.symLinkVariant.alias;
3894                         if(!alias)
3895                                 alias = _Y("no alias");
3896                         yaffs_strncpy(oh->alias,
3897                                         alias,
3898                                       YAFFS_MAX_ALIAS_LENGTH);
3899                         oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3900                         break;
3901                 }
3902
3903                 /* Tags */
3904                 yaffs_InitialiseTags(&newTags);
3905                 in->serial++;
3906                 newTags.chunkId = 0;
3907                 newTags.objectId = in->objectId;
3908                 newTags.serialNumber = in->serial;
3909
3910                 /* Add extra info for file header */
3911
3912                 newTags.extraHeaderInfoAvailable = 1;
3913                 newTags.extraParentObjectId = oh->parentObjectId;
3914                 newTags.extraFileLength = oh->fileSize;
3915                 newTags.extraIsShrinkHeader = oh->isShrink;
3916                 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3917                 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3918                 newTags.extraObjectType = in->variantType;
3919
3920                 yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
3921
3922                 /* Create new chunk in NAND */
3923                 newChunkId =
3924                     yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3925                                                       (prevChunkId > 0) ? 1 : 0);
3926
3927                 if (newChunkId >= 0) {
3928
3929                         in->hdrChunk = newChunkId;
3930
3931                         if (prevChunkId > 0) {
3932                                 yaffs_DeleteChunk(dev, prevChunkId, 1,
3933                                                   __LINE__);
3934                         }
3935
3936                         if (!yaffs_ObjectHasCachedWriteData(in))
3937                                 in->dirty = 0;
3938
3939                         /* If this was a shrink, then mark the block that the chunk lives on */
3940                         if (isShrink) {
3941                                 bi = yaffs_GetBlockInfo(in->myDev,
3942                                         newChunkId / in->myDev->nChunksPerBlock);
3943                                 bi->hasShrinkHeader = 1;
3944                         }
3945
3946                 }
3947
3948                 retVal = newChunkId;
3949
3950         }
3951
3952         if (buffer)
3953                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3954
3955         return retVal;
3956 }
3957
3958 /*------------------------ Short Operations Cache ----------------------------------------
3959  *   In many situations where there is no high level buffering (eg WinCE) a lot of
3960  *   reads might be short sequential reads, and a lot of writes may be short
3961  *   sequential writes. eg. scanning/writing a jpeg file.
3962  *   In these cases, a short read/write cache can provide a huge perfomance benefit
3963  *   with dumb-as-a-rock code.
3964  *   In Linux, the page cache provides read buffering aand the short op cache provides write
3965  *   buffering.
3966  *
3967  *   There are a limited number (~10) of cache chunks per device so that we don't
3968  *   need a very intelligent search.
3969  */
3970
3971 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3972 {
3973         yaffs_Device *dev = obj->myDev;
3974         int i;
3975         yaffs_ChunkCache *cache;
3976         int nCaches = obj->myDev->nShortOpCaches;
3977
3978         for (i = 0; i < nCaches; i++) {
3979                 cache = &dev->srCache[i];
3980                 if (cache->object == obj &&
3981                     cache->dirty)
3982                         return 1;
3983         }
3984
3985         return 0;
3986 }
3987
3988
3989 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
3990 {
3991         yaffs_Device *dev = obj->myDev;
3992         int lowest = -99;       /* Stop compiler whining. */
3993         int i;
3994         yaffs_ChunkCache *cache;
3995         int chunkWritten = 0;
3996         int nCaches = obj->myDev->nShortOpCaches;
3997
3998         if (nCaches > 0) {
3999                 do {
4000                         cache = NULL;
4001
4002                         /* Find the dirty cache for this object with the lowest chunk id. */
4003                         for (i = 0; i < nCaches; i++) {
4004                                 if (dev->srCache[i].object == obj &&
4005                                     dev->srCache[i].dirty) {
4006                                         if (!cache
4007                                             || dev->srCache[i].chunkId <
4008                                             lowest) {
4009                                                 cache = &dev->srCache[i];
4010                                                 lowest = cache->chunkId;
4011                                         }
4012                                 }
4013                         }
4014
4015                         if (cache && !cache->locked) {
4016                                 /* Write it out and free it up */
4017
4018                                 chunkWritten =
4019                                     yaffs_WriteChunkDataToObject(cache->object,
4020                                                                  cache->chunkId,
4021                                                                  cache->data,
4022                                                                  cache->nBytes,
4023                                                                  1);
4024                                 cache->dirty = 0;
4025                                 cache->object = NULL;
4026                         }
4027
4028                 } while (cache && chunkWritten > 0);
4029
4030                 if (cache) {
4031                         /* Hoosterman, disk full while writing cache out. */
4032                         T(YAFFS_TRACE_ERROR,
4033                           (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
4034
4035                 }
4036         }
4037
4038 }
4039
4040 /*yaffs_FlushEntireDeviceCache(dev)
4041  *
4042  *
4043  */
4044
4045 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
4046 {
4047         yaffs_Object *obj;
4048         int nCaches = dev->nShortOpCaches;
4049         int i;
4050
4051         /* Find a dirty object in the cache and flush it...
4052          * until there are no further dirty objects.
4053          */
4054         do {
4055                 obj = NULL;
4056                 for (i = 0; i < nCaches && !obj; i++) {
4057                         if (dev->srCache[i].object &&
4058                             dev->srCache[i].dirty)
4059                                 obj = dev->srCache[i].object;
4060
4061                 }
4062                 if (obj)
4063                         yaffs_FlushFilesChunkCache(obj);
4064
4065         } while (obj);
4066
4067 }
4068
4069
4070 /* Grab us a cache chunk for use.
4071  * First look for an empty one.
4072  * Then look for the least recently used non-dirty one.
4073  * Then look for the least recently used dirty one...., flush and look again.
4074  */
4075 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
4076 {
4077         int i;
4078
4079         if (dev->nShortOpCaches > 0) {
4080                 for (i = 0; i < dev->nShortOpCaches; i++) {
4081                         if (!dev->srCache[i].object)
4082                                 return &dev->srCache[i];
4083                 }
4084         }
4085
4086         return NULL;
4087 }
4088
4089 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
4090 {
4091         yaffs_ChunkCache *cache;
4092         yaffs_Object *theObj;
4093         int usage;
4094         int i;
4095         int pushout;
4096
4097         if (dev->nShortOpCaches > 0) {
4098                 /* Try find a non-dirty one... */
4099
4100                 cache = yaffs_GrabChunkCacheWorker(dev);
4101
4102                 if (!cache) {
4103                         /* They were all dirty, find the last recently used object and flush
4104                          * its cache, then  find again.
4105                          * NB what's here is not very accurate, we actually flush the object
4106                          * the last recently used page.
4107                          */
4108
4109                         /* With locking we can't assume we can use entry zero */
4110
4111                         theObj = NULL;
4112                         usage = -1;
4113                         cache = NULL;
4114                         pushout = -1;
4115
4116                         for (i = 0; i < dev->nShortOpCaches; i++) {
4117                                 if (dev->srCache[i].object &&
4118                                     !dev->srCache[i].locked &&
4119                                     (dev->srCache[i].lastUse < usage || !cache)) {
4120                                         usage = dev->srCache[i].lastUse;
4121                                         theObj = dev->srCache[i].object;
4122                                         cache = &dev->srCache[i];
4123                                         pushout = i;
4124                                 }
4125                         }
4126
4127                         if (!cache || cache->dirty) {
4128                                 /* Flush and try again */
4129                                 yaffs_FlushFilesChunkCache(theObj);
4130                                 cache = yaffs_GrabChunkCacheWorker(dev);
4131                         }
4132
4133                 }
4134                 return cache;
4135         } else
4136                 return NULL;
4137
4138 }
4139
4140 /* Find a cached chunk */
4141 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
4142                                               int chunkId)
4143 {
4144         yaffs_Device *dev = obj->myDev;
4145         int i;
4146         if (dev->nShortOpCaches > 0) {
4147                 for (i = 0; i < dev->nShortOpCaches; i++) {
4148                         if (dev->srCache[i].object == obj &&
4149                             dev->srCache[i].chunkId == chunkId) {
4150                                 dev->cacheHits++;
4151
4152                                 return &dev->srCache[i];
4153                         }
4154                 }
4155         }
4156         return NULL;
4157 }
4158
4159 /* Mark the chunk for the least recently used algorithym */
4160 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
4161                                 int isAWrite)
4162 {
4163
4164         if (dev->nShortOpCaches > 0) {
4165                 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
4166                         /* Reset the cache usages */
4167                         int i;
4168                         for (i = 1; i < dev->nShortOpCaches; i++)
4169                                 dev->srCache[i].lastUse = 0;
4170
4171                         dev->srLastUse = 0;
4172                 }
4173
4174                 dev->srLastUse++;
4175
4176                 cache->lastUse = dev->srLastUse;
4177
4178                 if (isAWrite)
4179                         cache->dirty = 1;
4180         }
4181 }
4182
4183 /* Invalidate a single cache page.
4184  * Do this when a whole page gets written,
4185  * ie the short cache for this page is no longer valid.
4186  */
4187 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
4188 {
4189         if (object->myDev->nShortOpCaches > 0) {
4190                 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4191
4192                 if (cache)
4193                         cache->object = NULL;
4194         }
4195 }
4196
4197 /* Invalidate all the cache pages associated with this object
4198  * Do this whenever ther file is deleted or resized.
4199  */
4200 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
4201 {
4202         int i;
4203         yaffs_Device *dev = in->myDev;
4204
4205         if (dev->nShortOpCaches > 0) {
4206                 /* Invalidate it. */
4207                 for (i = 0; i < dev->nShortOpCaches; i++) {
4208                         if (dev->srCache[i].object == in)
4209                                 dev->srCache[i].object = NULL;
4210                 }
4211         }
4212 }
4213
4214 /*--------------------- Checkpointing --------------------*/
4215
4216
4217 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
4218 {
4219         yaffs_CheckpointValidity cp;
4220
4221         memset(&cp, 0, sizeof(cp));
4222
4223         cp.structType = sizeof(cp);
4224         cp.magic = YAFFS_MAGIC;
4225         cp.version = YAFFS_CHECKPOINT_VERSION;
4226         cp.head = (head) ? 1 : 0;
4227
4228         return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
4229                 1 : 0;
4230 }
4231
4232 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4233 {
4234         yaffs_CheckpointValidity cp;
4235         int ok;
4236
4237         ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4238
4239         if (ok)
4240                 ok = (cp.structType == sizeof(cp)) &&
4241                      (cp.magic == YAFFS_MAGIC) &&
4242                      (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4243                      (cp.head == ((head) ? 1 : 0));
4244         return ok ? 1 : 0;
4245 }
4246
4247 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4248                                            yaffs_Device *dev)
4249 {
4250         cp->nErasedBlocks = dev->nErasedBlocks;
4251         cp->allocationBlock = dev->allocationBlock;
4252         cp->allocationPage = dev->allocationPage;
4253         cp->nFreeChunks = dev->nFreeChunks;
4254
4255         cp->nDeletedFiles = dev->nDeletedFiles;
4256         cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4257         cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4258         cp->sequenceNumber = dev->sequenceNumber;
4259         cp->oldestDirtySequence = dev->oldestDirtySequence;
4260
4261 }
4262
4263 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4264                                            yaffs_CheckpointDevice *cp)
4265 {
4266         dev->nErasedBlocks = cp->nErasedBlocks;
4267         dev->allocationBlock = cp->allocationBlock;
4268         dev->allocationPage = cp->allocationPage;
4269         dev->nFreeChunks = cp->nFreeChunks;
4270
4271         dev->nDeletedFiles = cp->nDeletedFiles;
4272         dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4273         dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4274         dev->sequenceNumber = cp->sequenceNumber;
4275         dev->oldestDirtySequence = cp->oldestDirtySequence;
4276 }
4277
4278
4279 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4280 {
4281         yaffs_CheckpointDevice cp;
4282         __u32 nBytes;
4283         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4284
4285         int ok;
4286
4287         /* Write device runtime values*/
4288         yaffs_DeviceToCheckpointDevice(&cp, dev);
4289         cp.structType = sizeof(cp);
4290
4291         ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4292
4293         /* Write block info */
4294         if (ok) {
4295                 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4296                 ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
4297         }
4298
4299         /* Write chunk bits */
4300         if (ok) {
4301                 nBytes = nBlocks * dev->chunkBitmapStride;
4302                 ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
4303         }
4304         return   ok ? 1 : 0;
4305
4306 }
4307
4308 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4309 {
4310         yaffs_CheckpointDevice cp;
4311         __u32 nBytes;
4312         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4313
4314         int ok;
4315
4316         ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4317         if (!ok)
4318                 return 0;
4319
4320         if (cp.structType != sizeof(cp))
4321                 return 0;
4322
4323
4324         yaffs_CheckpointDeviceToDevice(dev, &cp);
4325
4326         nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4327
4328         ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
4329
4330         if (!ok)
4331                 return 0;
4332         nBytes = nBlocks * dev->chunkBitmapStride;
4333
4334         ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
4335
4336         return ok ? 1 : 0;
4337 }
4338
4339 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4340                                            yaffs_Object *obj)
4341 {
4342
4343         cp->objectId = obj->objectId;
4344         cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4345         cp->hdrChunk = obj->hdrChunk;
4346         cp->variantType = obj->variantType;
4347         cp->deleted = obj->deleted;
4348         cp->softDeleted = obj->softDeleted;
4349         cp->unlinked = obj->unlinked;
4350         cp->fake = obj->fake;
4351         cp->renameAllowed = obj->renameAllowed;
4352         cp->unlinkAllowed = obj->unlinkAllowed;
4353         cp->serial = obj->serial;
4354         cp->nDataChunks = obj->nDataChunks;
4355
4356         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4357                 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4358         else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4359                 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4360 }
4361
4362 static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
4363 {
4364
4365         yaffs_Object *parent;
4366
4367         if (obj->variantType != cp->variantType) {
4368                 T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
4369                         TCONT("chunk %d does not match existing object type %d")
4370                         TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
4371                         obj->variantType));
4372                 return 0;
4373         }
4374
4375         obj->objectId = cp->objectId;
4376
4377         if (cp->parentId)
4378                 parent = yaffs_FindOrCreateObjectByNumber(
4379                                         obj->myDev,
4380                                         cp->parentId,
4381                                         YAFFS_OBJECT_TYPE_DIRECTORY);
4382         else
4383                 parent = NULL;
4384
4385         if (parent) {
4386                 if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4387                         T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
4388                                 TCONT(" chunk %d Parent type, %d, not directory")
4389                                 TENDSTR),
4390                                 cp->objectId, cp->parentId, cp->variantType,
4391                                 cp->hdrChunk, parent->variantType));
4392                         return 0;
4393                 }
4394                 yaffs_AddObjectToDirectory(parent, obj);
4395         }
4396
4397         obj->hdrChunk = cp->hdrChunk;
4398         obj->variantType = cp->variantType;
4399         obj->deleted = cp->deleted;
4400         obj->softDeleted = cp->softDeleted;
4401         obj->unlinked = cp->unlinked;
4402         obj->fake = cp->fake;
4403         obj->renameAllowed = cp->renameAllowed;
4404         obj->unlinkAllowed = cp->unlinkAllowed;
4405         obj->serial = cp->serial;
4406         obj->nDataChunks = cp->nDataChunks;
4407
4408         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4409                 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4410         else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4411                 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4412
4413         if (obj->hdrChunk > 0)
4414                 obj->lazyLoaded = 1;
4415         return 1;
4416 }
4417
4418
4419
4420 static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
4421                                         __u32 level, int chunkOffset)
4422 {
4423         int i;
4424         yaffs_Device *dev = in->myDev;
4425         int ok = 1;
4426         int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4427
4428         if (tnodeSize < sizeof(yaffs_Tnode))
4429                 tnodeSize = sizeof(yaffs_Tnode);
4430
4431
4432         if (tn) {
4433                 if (level > 0) {
4434
4435                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
4436                                 if (tn->internal[i]) {
4437                                         ok = yaffs_CheckpointTnodeWorker(in,
4438                                                         tn->internal[i],
4439                                                         level - 1,
4440                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4441                                 }
4442                         }
4443                 } else if (level == 0) {
4444                         __u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
4445                         ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
4446                         if (ok)
4447                                 ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
4448                 }
4449         }
4450
4451         return ok;
4452
4453 }
4454
4455 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4456 {
4457         __u32 endMarker = ~0;
4458         int ok = 1;
4459
4460         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4461                 ok = yaffs_CheckpointTnodeWorker(obj,
4462                                             obj->variant.fileVariant.top,
4463                                             obj->variant.fileVariant.topLevel,
4464                                             0);
4465                 if (ok)
4466                         ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
4467                                 sizeof(endMarker));
4468         }
4469
4470         return ok ? 1 : 0;
4471 }
4472
4473 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4474 {
4475         __u32 baseChunk;
4476         int ok = 1;
4477         yaffs_Device *dev = obj->myDev;
4478         yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4479         yaffs_Tnode *tn;
4480         int nread = 0;
4481         int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4482
4483         if (tnodeSize < sizeof(yaffs_Tnode))
4484                 tnodeSize = sizeof(yaffs_Tnode);
4485
4486         ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4487
4488         while (ok && (~baseChunk)) {
4489                 nread++;
4490                 /* Read level 0 tnode */
4491
4492
4493                 tn = yaffs_GetTnodeRaw(dev);
4494                 if (tn)
4495                         ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
4496                 else
4497                         ok = 0;
4498
4499                 if (tn && ok)
4500                         ok = yaffs_AddOrFindLevel0Tnode(dev,
4501                                                         fileStructPtr,
4502                                                         baseChunk,
4503                                                         tn) ? 1 : 0;
4504
4505                 if (ok)
4506                         ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4507
4508         }
4509
4510         T(YAFFS_TRACE_CHECKPOINT, (
4511                 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4512                 nread, baseChunk, ok));
4513
4514         return ok ? 1 : 0;
4515 }
4516
4517
4518 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4519 {
4520         yaffs_Object *obj;
4521         yaffs_CheckpointObject cp;
4522         int i;
4523         int ok = 1;
4524         struct ylist_head *lh;
4525
4526
4527         /* Iterate through the objects in each hash entry,
4528          * dumping them to the checkpointing stream.
4529          */
4530
4531         for (i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++) {
4532                 ylist_for_each(lh, &dev->objectBucket[i].list) {
4533                         if (lh) {
4534                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
4535                                 if (!obj->deferedFree) {
4536                                         yaffs_ObjectToCheckpointObject(&cp, obj);
4537                                         cp.structType = sizeof(cp);
4538
4539                                         T(YAFFS_TRACE_CHECKPOINT, (
4540                                                 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %p" TENDSTR),
4541                                                 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, obj));
4542
4543                                         ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4544
4545                                         if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4546                                                 ok = yaffs_WriteCheckpointTnodes(obj);
4547                                 }
4548                         }
4549                 }
4550         }
4551
4552         /* Dump end of list */
4553         memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
4554         cp.structType = sizeof(cp);
4555
4556         if (ok)
4557                 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4558
4559         return ok ? 1 : 0;
4560 }
4561
4562 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4563 {
4564         yaffs_Object *obj;
4565         yaffs_CheckpointObject cp;
4566         int ok = 1;
4567         int done = 0;
4568         yaffs_Object *hardList = NULL;
4569
4570         while (ok && !done) {
4571                 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4572                 if (cp.structType != sizeof(cp)) {
4573                         T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
4574                                 cp.structType, (int)sizeof(cp), ok));
4575                         ok = 0;
4576                 }
4577
4578                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4579                         cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
4580
4581                 if (ok && cp.objectId == ~0)
4582                         done = 1;
4583                 else if (ok) {
4584                         obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
4585                         if (obj) {
4586                                 ok = yaffs_CheckpointObjectToObject(obj, &cp);
4587                                 if (!ok)
4588                                         break;
4589                                 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4590                                         ok = yaffs_ReadCheckpointTnodes(obj);
4591                                 } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4592                                         obj->hardLinks.next =
4593                                                 (struct ylist_head *) hardList;
4594                                         hardList = obj;
4595                                 }
4596                         } else
4597                                 ok = 0;
4598                 }
4599         }
4600
4601         if (ok)
4602                 yaffs_HardlinkFixup(dev, hardList);
4603
4604         return ok ? 1 : 0;
4605 }
4606
4607 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4608 {
4609         __u32 checkpointSum;
4610         int ok;
4611
4612         yaffs_GetCheckpointSum(dev, &checkpointSum);
4613
4614         ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
4615
4616         if (!ok)
4617                 return 0;
4618
4619         return 1;
4620 }
4621
4622 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4623 {
4624         __u32 checkpointSum0;
4625         __u32 checkpointSum1;
4626         int ok;
4627
4628         yaffs_GetCheckpointSum(dev, &checkpointSum0);
4629
4630         ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4631
4632         if (!ok)
4633                 return 0;
4634
4635         if (checkpointSum0 != checkpointSum1)
4636                 return 0;
4637
4638         return 1;
4639 }
4640
4641
4642 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4643 {
4644         int ok = 1;
4645
4646         if (dev->skipCheckpointWrite || !dev->isYaffs2) {
4647                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
4648                 ok = 0;
4649         }
4650
4651         if (ok)
4652                 ok = yaffs_CheckpointOpen(dev, 1);
4653
4654         if (ok) {
4655                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4656                 ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
4657         }
4658         if (ok) {
4659                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
4660                 ok = yaffs_WriteCheckpointDevice(dev);
4661         }
4662         if (ok) {
4663                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
4664                 ok = yaffs_WriteCheckpointObjects(dev);
4665         }
4666         if (ok) {
4667                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4668                 ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
4669         }
4670
4671         if (ok)
4672                 ok = yaffs_WriteCheckpointSum(dev);
4673
4674         if (!yaffs_CheckpointClose(dev))
4675                 ok = 0;
4676
4677         if (ok)
4678                 dev->isCheckpointed = 1;
4679         else
4680                 dev->isCheckpointed = 0;
4681
4682         return dev->isCheckpointed;
4683 }
4684
4685 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4686 {
4687         int ok = 1;
4688
4689         if (dev->skipCheckpointRead || !dev->isYaffs2) {
4690                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
4691                 ok = 0;
4692         }
4693
4694         if (ok)
4695                 ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
4696
4697         if (ok) {
4698                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4699                 ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
4700         }
4701         if (ok) {
4702                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
4703                 ok = yaffs_ReadCheckpointDevice(dev);
4704         }
4705         if (ok) {
4706                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
4707                 ok = yaffs_ReadCheckpointObjects(dev);
4708         }
4709         if (ok) {
4710                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4711                 ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
4712         }
4713
4714         if (ok) {
4715                 ok = yaffs_ReadCheckpointSum(dev);
4716                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
4717         }
4718
4719         if (!yaffs_CheckpointClose(dev))
4720                 ok = 0;
4721
4722         if (ok)
4723                 dev->isCheckpointed = 1;
4724         else
4725                 dev->isCheckpointed = 0;
4726
4727         return ok ? 1 : 0;
4728
4729 }
4730
4731 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4732 {
4733         if (dev->isCheckpointed ||
4734                         dev->blocksInCheckpoint > 0) {
4735                 dev->isCheckpointed = 0;
4736                 yaffs_CheckpointInvalidateStream(dev);
4737                 if (dev->superBlock && dev->markSuperBlockDirty)
4738                         dev->markSuperBlockDirty(dev->superBlock);
4739         }
4740 }
4741
4742
4743 int yaffs_CheckpointSave(yaffs_Device *dev)
4744 {
4745
4746         T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4747
4748         yaffs_VerifyObjects(dev);
4749         yaffs_VerifyBlocks(dev);
4750         yaffs_VerifyFreeChunks(dev);
4751
4752         if (!dev->isCheckpointed) {
4753                 yaffs_InvalidateCheckpoint(dev);
4754                 yaffs_WriteCheckpointData(dev);
4755         }
4756
4757         T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4758
4759         return dev->isCheckpointed;
4760 }
4761
4762 int yaffs_CheckpointRestore(yaffs_Device *dev)
4763 {
4764         int retval;
4765         T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4766
4767         retval = yaffs_ReadCheckpointData(dev);
4768
4769         if (dev->isCheckpointed) {
4770                 yaffs_VerifyObjects(dev);
4771                 yaffs_VerifyBlocks(dev);
4772                 yaffs_VerifyFreeChunks(dev);
4773         }
4774
4775         T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4776
4777         return retval;
4778 }
4779
4780 /*--------------------- File read/write ------------------------
4781  * Read and write have very similar structures.
4782  * In general the read/write has three parts to it
4783  * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4784  * Some complete chunks
4785  * An incomplete chunk to end off with
4786  *
4787  * Curve-balls: the first chunk might also be the last chunk.
4788  */
4789
4790 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
4791                         int nBytes)
4792 {
4793
4794         int chunk;
4795         __u32 start;
4796         int nToCopy;
4797         int n = nBytes;
4798         int nDone = 0;
4799         yaffs_ChunkCache *cache;
4800
4801         yaffs_Device *dev;
4802
4803         dev = in->myDev;
4804
4805         while (n > 0) {
4806                 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4807                 /* start = offset % dev->nDataBytesPerChunk; */
4808                 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4809                 chunk++;
4810
4811                 /* OK now check for the curveball where the start and end are in
4812                  * the same chunk.
4813                  */
4814                 if ((start + n) < dev->nDataBytesPerChunk)
4815                         nToCopy = n;
4816                 else
4817                         nToCopy = dev->nDataBytesPerChunk - start;
4818
4819                 cache = yaffs_FindChunkCache(in, chunk);
4820
4821                 /* If the chunk is already in the cache or it is less than a whole chunk
4822                  * or we're using inband tags then use the cache (if there is caching)
4823                  * else bypass the cache.
4824                  */
4825                 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4826                         if (dev->nShortOpCaches > 0) {
4827
4828                                 /* If we can't find the data in the cache, then load it up. */
4829
4830                                 if (!cache) {
4831                                         cache = yaffs_GrabChunkCache(in->myDev);
4832                                         cache->object = in;
4833                                         cache->chunkId = chunk;
4834                                         cache->dirty = 0;
4835                                         cache->locked = 0;
4836                                         yaffs_ReadChunkDataFromObject(in, chunk,
4837                                                                       cache->
4838                                                                       data);
4839                                         cache->nBytes = 0;
4840                                 }
4841
4842                                 yaffs_UseChunkCache(dev, cache, 0);
4843
4844                                 cache->locked = 1;
4845
4846
4847                                 memcpy(buffer, &cache->data[start], nToCopy);
4848
4849                                 cache->locked = 0;
4850                         } else {
4851                                 /* Read into the local buffer then copy..*/
4852
4853                                 __u8 *localBuffer =
4854                                     yaffs_GetTempBuffer(dev, __LINE__);
4855                                 yaffs_ReadChunkDataFromObject(in, chunk,
4856                                                               localBuffer);
4857
4858                                 memcpy(buffer, &localBuffer[start], nToCopy);
4859
4860
4861                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
4862                                                         __LINE__);
4863                         }
4864
4865                 } else {
4866
4867                         /* A full chunk. Read directly into the supplied buffer. */
4868                         yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4869
4870                 }
4871
4872                 n -= nToCopy;
4873                 offset += nToCopy;
4874                 buffer += nToCopy;
4875                 nDone += nToCopy;
4876
4877         }
4878
4879         return nDone;
4880 }
4881
4882 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
4883                         int nBytes, int writeThrough)
4884 {
4885
4886         int chunk;
4887         __u32 start;
4888         int nToCopy;
4889         int n = nBytes;
4890         int nDone = 0;
4891         int nToWriteBack;
4892         int startOfWrite = offset;
4893         int chunkWritten = 0;
4894         __u32 nBytesRead;
4895         __u32 chunkStart;
4896
4897         yaffs_Device *dev;
4898
4899         dev = in->myDev;
4900
4901         while (n > 0 && chunkWritten >= 0) {
4902                 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4903                 /* start = offset % dev->nDataBytesPerChunk; */
4904                 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4905
4906                 if (chunk * dev->nDataBytesPerChunk + start != offset ||
4907                                 start >= dev->nDataBytesPerChunk) {
4908                         T(YAFFS_TRACE_ERROR, (
4909                            TSTR("AddrToChunk of offset %d gives chunk %d start %d"
4910                            TENDSTR),
4911                            (int)offset, chunk, start));
4912                 }
4913                 chunk++;
4914
4915                 /* OK now check for the curveball where the start and end are in
4916                  * the same chunk.
4917                  */
4918
4919                 if ((start + n) < dev->nDataBytesPerChunk) {
4920                         nToCopy = n;
4921
4922                         /* Now folks, to calculate how many bytes to write back....
4923                          * If we're overwriting and not writing to then end of file then
4924                          * we need to write back as much as was there before.
4925                          */
4926
4927                         chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
4928
4929                         if (chunkStart > in->variant.fileVariant.fileSize)
4930                                 nBytesRead = 0; /* Past end of file */
4931                         else
4932                                 nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
4933
4934                         if (nBytesRead > dev->nDataBytesPerChunk)
4935                                 nBytesRead = dev->nDataBytesPerChunk;
4936
4937                         nToWriteBack =
4938                             (nBytesRead >
4939                              (start + n)) ? nBytesRead : (start + n);
4940
4941                         if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
4942                                 YBUG();
4943
4944                 } else {
4945                         nToCopy = dev->nDataBytesPerChunk - start;
4946                         nToWriteBack = dev->nDataBytesPerChunk;
4947                 }
4948
4949                 if (nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4950                         /* An incomplete start or end chunk (or maybe both start and end chunk),
4951                          * or we're using inband tags, so we want to use the cache buffers.
4952                          */
4953                         if (dev->nShortOpCaches > 0) {
4954                                 yaffs_ChunkCache *cache;
4955                                 /* If we can't find the data in the cache, then load the cache */
4956                                 cache = yaffs_FindChunkCache(in, chunk);
4957
4958                                 if (!cache
4959                                     && yaffs_CheckSpaceForAllocation(in->
4960                                                                      myDev)) {
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                                 } else if (cache &&
4970                                         !cache->dirty &&
4971                                         !yaffs_CheckSpaceForAllocation(in->myDev)) {
4972                                         /* Drop the cache if it was a read cache item and
4973                                          * no space check has been made for it.
4974                                          */
4975                                          cache = NULL;
4976                                 }
4977
4978                                 if (cache) {
4979                                         yaffs_UseChunkCache(dev, cache, 1);
4980                                         cache->locked = 1;
4981
4982
4983                                         memcpy(&cache->data[start], buffer,
4984                                                nToCopy);
4985
4986
4987                                         cache->locked = 0;
4988                                         cache->nBytes = nToWriteBack;
4989
4990                                         if (writeThrough) {
4991                                                 chunkWritten =
4992                                                     yaffs_WriteChunkDataToObject
4993                                                     (cache->object,
4994                                                      cache->chunkId,
4995                                                      cache->data, cache->nBytes,
4996                                                      1);
4997                                                 cache->dirty = 0;
4998                                         }
4999
5000                                 } else {
5001                                         chunkWritten = -1;      /* fail the write */
5002                                 }
5003                         } else {
5004                                 /* An incomplete start or end chunk (or maybe both start and end chunk)
5005                                  * Read into the local buffer then copy, then copy over and write back.
5006                                  */
5007
5008                                 __u8 *localBuffer =
5009                                     yaffs_GetTempBuffer(dev, __LINE__);
5010
5011                                 yaffs_ReadChunkDataFromObject(in, chunk,
5012                                                               localBuffer);
5013
5014
5015
5016                                 memcpy(&localBuffer[start], buffer, nToCopy);
5017
5018                                 chunkWritten =
5019                                     yaffs_WriteChunkDataToObject(in, chunk,
5020                                                                  localBuffer,
5021                                                                  nToWriteBack,
5022                                                                  0);
5023
5024                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
5025                                                         __LINE__);
5026
5027                         }
5028
5029                 } else {
5030                         /* A full chunk. Write directly from the supplied buffer. */
5031
5032
5033
5034                         chunkWritten =
5035                             yaffs_WriteChunkDataToObject(in, chunk, buffer,
5036                                                          dev->nDataBytesPerChunk,
5037                                                          0);
5038
5039                         /* Since we've overwritten the cached data, we better invalidate it. */
5040                         yaffs_InvalidateChunkCache(in, chunk);
5041                 }
5042
5043                 if (chunkWritten >= 0) {
5044                         n -= nToCopy;
5045                         offset += nToCopy;
5046                         buffer += nToCopy;
5047                         nDone += nToCopy;
5048                 }
5049
5050         }
5051
5052         /* Update file object */
5053
5054         if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
5055                 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
5056
5057         in->dirty = 1;
5058
5059         return nDone;
5060 }
5061
5062
5063 /* ---------------------- File resizing stuff ------------------ */
5064
5065 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
5066 {
5067
5068         yaffs_Device *dev = in->myDev;
5069         int oldFileSize = in->variant.fileVariant.fileSize;
5070
5071         int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
5072
5073         int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
5074             dev->nDataBytesPerChunk;
5075         int i;
5076         int chunkId;
5077
5078         /* Delete backwards so that we don't end up with holes if
5079          * power is lost part-way through the operation.
5080          */
5081         for (i = lastDel; i >= startDel; i--) {
5082                 /* NB this could be optimised somewhat,
5083                  * eg. could retrieve the tags and write them without
5084                  * using yaffs_DeleteChunk
5085                  */
5086
5087                 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
5088                 if (chunkId > 0) {
5089                         if (chunkId <
5090                             (dev->internalStartBlock * dev->nChunksPerBlock)
5091                             || chunkId >=
5092                             ((dev->internalEndBlock +
5093                               1) * dev->nChunksPerBlock)) {
5094                                 T(YAFFS_TRACE_ALWAYS,
5095                                   (TSTR("Found daft chunkId %d for %d" TENDSTR),
5096                                    chunkId, i));
5097                         } else {
5098                                 in->nDataChunks--;
5099                                 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
5100                         }
5101                 }
5102         }
5103
5104 }
5105
5106 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
5107 {
5108
5109         int oldFileSize = in->variant.fileVariant.fileSize;
5110         __u32 newSizeOfPartialChunk;
5111         int newFullChunks;
5112
5113         yaffs_Device *dev = in->myDev;
5114
5115         yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
5116
5117         yaffs_FlushFilesChunkCache(in);
5118         yaffs_InvalidateWholeChunkCache(in);
5119
5120         yaffs_CheckGarbageCollection(dev);
5121
5122         if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
5123                 return YAFFS_FAIL;
5124
5125         if (newSize == oldFileSize)
5126                 return YAFFS_OK;
5127
5128         if (newSize < oldFileSize) {
5129
5130                 yaffs_PruneResizedChunks(in, newSize);
5131
5132                 if (newSizeOfPartialChunk != 0) {
5133                         int lastChunk = 1 + newFullChunks;
5134
5135                         __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
5136
5137                         /* Got to read and rewrite the last chunk with its new size and zero pad */
5138                         yaffs_ReadChunkDataFromObject(in, lastChunk,
5139                                                       localBuffer);
5140
5141                         memset(localBuffer + newSizeOfPartialChunk, 0,
5142                                dev->nDataBytesPerChunk - newSizeOfPartialChunk);
5143
5144                         yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
5145                                                      newSizeOfPartialChunk, 1);
5146
5147                         yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
5148                 }
5149
5150                 in->variant.fileVariant.fileSize = newSize;
5151
5152                 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
5153         } else {
5154                 /* newsSize > oldFileSize */
5155                 in->variant.fileVariant.fileSize = newSize;
5156         }
5157
5158
5159         /* Write a new object header to reflect the resize.
5160          * show we've shrunk the file, if need be
5161          * Do this only if the file is not in the deleted directories
5162          * and is not shadowed.
5163          */
5164         if (in->parent &&
5165             !in->isShadowed &&
5166             in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5167             in->parent->objectId != YAFFS_OBJECTID_DELETED)
5168                 yaffs_UpdateObjectHeader(in, NULL, 0,
5169                                          (newSize < oldFileSize) ? 1 : 0, 0);
5170
5171         return YAFFS_OK;
5172 }
5173
5174 loff_t yaffs_GetFileSize(yaffs_Object *obj)
5175 {
5176         YCHAR *alias = NULL;
5177         obj = yaffs_GetEquivalentObject(obj);
5178
5179         switch (obj->variantType) {
5180         case YAFFS_OBJECT_TYPE_FILE:
5181                 return obj->variant.fileVariant.fileSize;
5182         case YAFFS_OBJECT_TYPE_SYMLINK:
5183                 alias = obj->variant.symLinkVariant.alias;
5184                 if(!alias)
5185                         return 0;
5186                 return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
5187         default:
5188                 return 0;
5189         }
5190 }
5191
5192
5193
5194 int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
5195 {
5196         int retVal;
5197         if (in->dirty) {
5198                 yaffs_FlushFilesChunkCache(in);
5199                 if(dataSync) /* Only sync data */
5200                         retVal=YAFFS_OK;
5201                 else {
5202                         if (updateTime) {
5203 #ifdef CONFIG_YAFFS_WINCE
5204                                 yfsd_WinFileTimeNow(in->win_mtime);
5205 #else
5206
5207                                 in->yst_mtime = Y_CURRENT_TIME;
5208
5209 #endif
5210                         }
5211
5212                         retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5213                                 0) ? YAFFS_OK : YAFFS_FAIL;
5214                 }
5215         } else {
5216                 retVal = YAFFS_OK;
5217         }
5218
5219         return retVal;
5220
5221 }
5222
5223 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
5224 {
5225
5226         /* First off, invalidate the file's data in the cache, without flushing. */
5227         yaffs_InvalidateWholeChunkCache(in);
5228
5229         if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5230                 /* Move to the unlinked directory so we have a record that it was deleted. */
5231                 yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
5232
5233         }
5234
5235         yaffs_RemoveObjectFromDirectory(in);
5236         yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
5237         in->hdrChunk = 0;
5238
5239         yaffs_FreeObject(in);
5240         return YAFFS_OK;
5241
5242 }
5243
5244 /* yaffs_DeleteFile deletes the whole file data
5245  * and the inode associated with the file.
5246  * It does not delete the links associated with the file.
5247  */
5248 static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
5249 {
5250
5251         int retVal;
5252         int immediateDeletion = 0;
5253
5254         if (!in->myInode)
5255                 immediateDeletion = 1;
5256
5257         if (immediateDeletion) {
5258                 retVal =
5259                     yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5260                                            _Y("deleted"), 0, 0);
5261                 T(YAFFS_TRACE_TRACING,
5262                   (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5263                    in->objectId));
5264                 in->deleted = 1;
5265                 in->myDev->nDeletedFiles++;
5266                 if (1 || in->myDev->isYaffs2)
5267                         yaffs_ResizeFile(in, 0);
5268                 yaffs_SoftDeleteFile(in);
5269         } else {
5270                 retVal =
5271                     yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5272                                            _Y("unlinked"), 0, 0);
5273         }
5274
5275
5276         return retVal;
5277 }
5278
5279 int yaffs_DeleteFile(yaffs_Object *in)
5280 {
5281         int retVal = YAFFS_OK;
5282         int deleted = in->deleted;
5283
5284         yaffs_ResizeFile(in, 0);
5285
5286         if (in->nDataChunks > 0) {
5287                 /* Use soft deletion if there is data in the file.
5288                  * That won't be the case if it has been resized to zero.
5289                  */
5290                 if (!in->unlinked)
5291                         retVal = yaffs_UnlinkFileIfNeeded(in);
5292
5293                 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5294                         in->deleted = 1;
5295                         deleted = 1;
5296                         in->myDev->nDeletedFiles++;
5297                         yaffs_SoftDeleteFile(in);
5298                 }
5299                 return deleted ? YAFFS_OK : YAFFS_FAIL;
5300         } else {
5301                 /* The file has no data chunks so we toss it immediately */
5302                 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5303                 in->variant.fileVariant.top = NULL;
5304                 yaffs_DoGenericObjectDeletion(in);
5305
5306                 return YAFFS_OK;
5307         }
5308 }
5309
5310 static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
5311 {
5312         return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
5313                 !(ylist_empty(&obj->variant.directoryVariant.children));
5314 }
5315
5316 static int yaffs_DeleteDirectory(yaffs_Object *obj)
5317 {
5318         /* First check that the directory is empty. */
5319         if (yaffs_IsNonEmptyDirectory(obj))
5320                 return YAFFS_FAIL;
5321
5322         return yaffs_DoGenericObjectDeletion(obj);
5323 }
5324
5325 static int yaffs_DeleteSymLink(yaffs_Object *in)
5326 {
5327         if(in->variant.symLinkVariant.alias)
5328                 YFREE(in->variant.symLinkVariant.alias);
5329         in->variant.symLinkVariant.alias=NULL;
5330
5331         return yaffs_DoGenericObjectDeletion(in);
5332 }
5333
5334 static int yaffs_DeleteHardLink(yaffs_Object *in)
5335 {
5336         /* remove this hardlink from the list assocaited with the equivalent
5337          * object
5338          */
5339         ylist_del_init(&in->hardLinks);
5340         return yaffs_DoGenericObjectDeletion(in);
5341 }
5342
5343 int yaffs_DeleteObject(yaffs_Object *obj)
5344 {
5345 int retVal = -1;
5346         switch (obj->variantType) {
5347         case YAFFS_OBJECT_TYPE_FILE:
5348                 retVal = yaffs_DeleteFile(obj);
5349                 break;
5350         case YAFFS_OBJECT_TYPE_DIRECTORY:
5351                 return yaffs_DeleteDirectory(obj);
5352                 break;
5353         case YAFFS_OBJECT_TYPE_SYMLINK:
5354                 retVal = yaffs_DeleteSymLink(obj);
5355                 break;
5356         case YAFFS_OBJECT_TYPE_HARDLINK:
5357                 retVal = yaffs_DeleteHardLink(obj);
5358                 break;
5359         case YAFFS_OBJECT_TYPE_SPECIAL:
5360                 retVal = yaffs_DoGenericObjectDeletion(obj);
5361                 break;
5362         case YAFFS_OBJECT_TYPE_UNKNOWN:
5363                 retVal = 0;
5364                 break;          /* should not happen. */
5365         }
5366
5367         return retVal;
5368 }
5369
5370 static int yaffs_UnlinkWorker(yaffs_Object *obj)
5371 {
5372
5373         int immediateDeletion = 0;
5374
5375         if (!obj->myInode)
5376                 immediateDeletion = 1;
5377
5378         if(obj)
5379                 yaffs_UpdateParent(obj->parent);
5380
5381         if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5382                 return yaffs_DeleteHardLink(obj);
5383         } else if (!ylist_empty(&obj->hardLinks)) {
5384                 /* Curve ball: We're unlinking an object that has a hardlink.
5385                  *
5386                  * This problem arises because we are not strictly following
5387                  * The Linux link/inode model.
5388                  *
5389                  * We can't really delete the object.
5390                  * Instead, we do the following:
5391                  * - Select a hardlink.
5392                  * - Unhook it from the hard links
5393                  * - Move it from its parent directory (so that the rename can work)
5394                  * - Rename the object to the hardlink's name.
5395                  * - Delete the hardlink
5396                  */
5397
5398                 yaffs_Object *hl;
5399                 yaffs_Object *parent;
5400                 int retVal;
5401                 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5402
5403                 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5404
5405                 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5406                 parent = hl->parent;
5407
5408                 ylist_del_init(&hl->hardLinks);
5409
5410                 yaffs_AddObjectToDirectory(obj->myDev->unlinkedDir, hl);
5411
5412                 retVal = yaffs_ChangeObjectName(obj,parent, name, 0, 0);
5413
5414                 if (retVal == YAFFS_OK)
5415                         retVal = yaffs_DoGenericObjectDeletion(hl);
5416
5417                 return retVal;
5418
5419         } else if (immediateDeletion) {
5420                 switch (obj->variantType) {
5421                 case YAFFS_OBJECT_TYPE_FILE:
5422                         return yaffs_DeleteFile(obj);
5423                         break;
5424                 case YAFFS_OBJECT_TYPE_DIRECTORY:
5425                         return yaffs_DeleteDirectory(obj);
5426                         break;
5427                 case YAFFS_OBJECT_TYPE_SYMLINK:
5428                         return yaffs_DeleteSymLink(obj);
5429                         break;
5430                 case YAFFS_OBJECT_TYPE_SPECIAL:
5431                         return yaffs_DoGenericObjectDeletion(obj);
5432                         break;
5433                 case YAFFS_OBJECT_TYPE_HARDLINK:
5434                 case YAFFS_OBJECT_TYPE_UNKNOWN:
5435                 default:
5436                         return YAFFS_FAIL;
5437                 }
5438         } else if(yaffs_IsNonEmptyDirectory(obj))
5439                 return YAFFS_FAIL;
5440         else
5441                 return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
5442                                            _Y("unlinked"), 0, 0);
5443 }
5444
5445
5446 static int yaffs_UnlinkObject(yaffs_Object *obj)
5447 {
5448
5449         if (obj && obj->unlinkAllowed)
5450                 return yaffs_UnlinkWorker(obj);
5451
5452         return YAFFS_FAIL;
5453
5454 }
5455 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
5456 {
5457         yaffs_Object *obj;
5458
5459         obj = yaffs_FindObjectByName(dir, name);
5460         return yaffs_UnlinkObject(obj);
5461 }
5462
5463 /*----------------------- Initialisation Scanning ---------------------- */
5464
5465 static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
5466                                 int backwardScanning)
5467 {
5468         yaffs_Object *obj;
5469
5470         if (!backwardScanning) {
5471                 /* Handle YAFFS1 forward scanning case
5472                  * For YAFFS1 we always do the deletion
5473                  */
5474
5475         } else {
5476                 /* Handle YAFFS2 case (backward scanning)
5477                  * If the shadowed object exists then ignore.
5478                  */
5479                 obj = yaffs_FindObjectByNumber(dev, objId);
5480                 if(obj)
5481                         return;
5482         }
5483
5484         /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5485          * We put it in unlinked dir to be cleaned up after the scanning
5486          */
5487         obj =
5488             yaffs_FindOrCreateObjectByNumber(dev, objId,
5489                                              YAFFS_OBJECT_TYPE_FILE);
5490         if (!obj)
5491                 return;
5492         obj->isShadowed = 1;
5493         yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5494         obj->variant.fileVariant.shrinkSize = 0;
5495         obj->valid = 1;         /* So that we don't read any other info for this file */
5496
5497 }
5498
5499 typedef struct {
5500         int seq;
5501         int block;
5502 } yaffs_BlockIndex;
5503
5504
5505 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5506 {
5507         yaffs_Object *hl;
5508         yaffs_Object *in;
5509
5510         while (hardList) {
5511                 hl = hardList;
5512                 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5513
5514                 in = yaffs_FindObjectByNumber(dev,
5515                                               hl->variant.hardLinkVariant.
5516                                               equivalentObjectId);
5517
5518                 if (in) {
5519                         /* Add the hardlink pointers */
5520                         hl->variant.hardLinkVariant.equivalentObject = in;
5521                         ylist_add(&hl->hardLinks, &in->hardLinks);
5522                 } else {
5523                         /* Todo Need to report/handle this better.
5524                          * Got a problem... hardlink to a non-existant object
5525                          */
5526                         hl->variant.hardLinkVariant.equivalentObject = NULL;
5527                         YINIT_LIST_HEAD(&hl->hardLinks);
5528
5529                 }
5530         }
5531 }
5532
5533
5534
5535
5536
5537 static int ybicmp(const void *a, const void *b)
5538 {
5539         register int aseq = ((yaffs_BlockIndex *)a)->seq;
5540         register int bseq = ((yaffs_BlockIndex *)b)->seq;
5541         register int ablock = ((yaffs_BlockIndex *)a)->block;
5542         register int bblock = ((yaffs_BlockIndex *)b)->block;
5543         if (aseq == bseq)
5544                 return ablock - bblock;
5545         else
5546                 return aseq - bseq;
5547 }
5548
5549
5550 struct yaffs_ShadowFixerStruct {
5551         int objectId;
5552         int shadowedId;
5553         struct yaffs_ShadowFixerStruct *next;
5554 };
5555
5556
5557 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
5558 {
5559         /*
5560         *  Sort out state of unlinked and deleted objects after scanning.
5561         */
5562         struct ylist_head *i;
5563         struct ylist_head *n;
5564         yaffs_Object *l;
5565
5566         /* Soft delete all the unlinked files */
5567         ylist_for_each_safe(i, n,
5568                 &dev->unlinkedDir->variant.directoryVariant.children) {
5569                 if (i) {
5570                         l = ylist_entry(i, yaffs_Object, siblings);
5571                         yaffs_DeleteObject(l);
5572                 }
5573         }
5574
5575         ylist_for_each_safe(i, n,
5576                 &dev->deletedDir->variant.directoryVariant.children) {
5577                 if (i) {
5578                         l = ylist_entry(i, yaffs_Object, siblings);
5579                         yaffs_DeleteObject(l);
5580                 }
5581         }
5582
5583 }
5584
5585 /*
5586  * This code iterates through all the objects making sure that they are rooted.
5587  * Any unrooted objects are re-rooted in lost+found.
5588  * An object needs to be in one of:
5589  * - Directly under deleted, unlinked
5590  * - Directly or indirectly under root.
5591  *
5592  * Note:
5593  *  This code assumes that we don't ever change the current relationships between
5594  *  directories:
5595  *   rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL
5596  *   lostNfound->parent == rootDir
5597  *
5598  * This fixes the problem where directories might have inadvertently been deleted
5599  * leaving the object "hanging" without being rooted in the directory tree.
5600  */
5601
5602 static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj)
5603 {
5604         return (obj == dev->deletedDir ||
5605                 obj == dev->unlinkedDir||
5606                 obj == dev->rootDir);
5607 }
5608
5609 static void yaffs_FixHangingObjects(yaffs_Device *dev)
5610 {
5611         yaffs_Object *obj;
5612         yaffs_Object *parent;
5613         int i;
5614         struct ylist_head *lh;
5615         struct ylist_head *n;
5616         int depthLimit;
5617         int hanging;
5618
5619
5620         /* Iterate through the objects in each hash entry,
5621          * looking at each object.
5622          * Make sure it is rooted.
5623          */
5624
5625         for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
5626                 ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) {
5627                         if (lh) {
5628                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
5629                                 parent= obj->parent;
5630
5631                                 if(yaffs_HasNULLParent(dev,obj)){
5632                                         /* These directories are not hanging */
5633                                         hanging = 0;
5634                                 }
5635                                 else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5636                                         hanging = 1;
5637                                 else if(yaffs_HasNULLParent(dev,parent))
5638                                         hanging = 0;
5639                                 else {
5640                                         /*
5641                                          * Need to follow the parent chain to see if it is hanging.
5642                                          */
5643                                         hanging = 0;
5644                                         depthLimit=100;
5645
5646                                         while(parent != dev->rootDir &&
5647                                                 parent->parent &&
5648                                                 parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
5649                                                 depthLimit > 0){
5650                                                 parent = parent->parent;
5651                                                 depthLimit--;
5652                                         }
5653                                         if(parent != dev->rootDir)
5654                                                 hanging = 1;
5655                                 }
5656                                 if(hanging){
5657                                         T(YAFFS_TRACE_SCAN,
5658                                           (TSTR("Hanging object %d moved to lost and found" TENDSTR),
5659                                                 obj->objectId));
5660                                         yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj);
5661                                 }
5662                         }
5663                 }
5664         }
5665 }
5666
5667
5668 /*
5669  * Delete directory contents for cleaning up lost and found.
5670  */
5671 static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
5672 {
5673         yaffs_Object *obj;
5674         struct ylist_head *lh;
5675         struct ylist_head *n;
5676
5677         if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5678                 YBUG();
5679
5680         ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) {
5681                 if (lh) {
5682                         obj = ylist_entry(lh, yaffs_Object, siblings);
5683                         if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
5684                                 yaffs_DeleteDirectoryContents(obj);
5685
5686                         T(YAFFS_TRACE_SCAN,
5687                                 (TSTR("Deleting lost_found object %d" TENDSTR),
5688                                 obj->objectId));
5689
5690                         /* Need to use UnlinkObject since Delete would not handle
5691                          * hardlinked objects correctly.
5692                          */
5693                         yaffs_UnlinkObject(obj);
5694                 }
5695         }
5696
5697 }
5698
5699 static void yaffs_EmptyLostAndFound(yaffs_Device *dev)
5700 {
5701         yaffs_DeleteDirectoryContents(dev->lostNFoundDir);
5702 }
5703
5704 static int yaffs_Scan(yaffs_Device *dev)
5705 {
5706         yaffs_ExtendedTags tags;
5707         int blk;
5708         int blockIterator;
5709         int startIterator;
5710         int endIterator;
5711         int result;
5712
5713         int chunk;
5714         int c;
5715         int deleted;
5716         yaffs_BlockState state;
5717         yaffs_Object *hardList = NULL;
5718         yaffs_BlockInfo *bi;
5719         __u32 sequenceNumber;
5720         yaffs_ObjectHeader *oh;
5721         yaffs_Object *in;
5722         yaffs_Object *parent;
5723
5724         int alloc_failed = 0;
5725
5726         struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
5727
5728
5729         __u8 *chunkData;
5730
5731
5732
5733         T(YAFFS_TRACE_SCAN,
5734           (TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
5735            dev->internalStartBlock, dev->internalEndBlock));
5736
5737         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5738
5739         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5740
5741         /* Scan all the blocks to determine their state */
5742         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5743                 bi = yaffs_GetBlockInfo(dev, blk);
5744                 yaffs_ClearChunkBits(dev, blk);
5745                 bi->pagesInUse = 0;
5746                 bi->softDeletions = 0;
5747
5748                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5749
5750                 bi->blockState = state;
5751                 bi->sequenceNumber = sequenceNumber;
5752
5753                 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
5754                         bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
5755
5756                 T(YAFFS_TRACE_SCAN_DEBUG,
5757                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5758                    state, sequenceNumber));
5759
5760                 if (state == YAFFS_BLOCK_STATE_DEAD) {
5761                         T(YAFFS_TRACE_BAD_BLOCKS,
5762                           (TSTR("block %d is bad" TENDSTR), blk));
5763                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5764                         T(YAFFS_TRACE_SCAN_DEBUG,
5765                           (TSTR("Block empty " TENDSTR)));
5766                         dev->nErasedBlocks++;
5767                         dev->nFreeChunks += dev->nChunksPerBlock;
5768                 }
5769         }
5770
5771         startIterator = dev->internalStartBlock;
5772         endIterator = dev->internalEndBlock;
5773
5774         /* For each block.... */
5775         for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5776              blockIterator++) {
5777
5778                 YYIELD();
5779
5780                 YYIELD();
5781
5782                 blk = blockIterator;
5783
5784                 bi = yaffs_GetBlockInfo(dev, blk);
5785                 state = bi->blockState;
5786
5787                 deleted = 0;
5788
5789                 /* For each chunk in each block that needs scanning....*/
5790                 for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
5791                      state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5792                         /* Read the tags and decide what to do */
5793                         chunk = blk * dev->nChunksPerBlock + c;
5794
5795                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5796                                                         &tags);
5797
5798                         /* Let's have a good look at this chunk... */
5799
5800                         if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
5801                                 /* YAFFS1 only...
5802                                  * A deleted chunk
5803                                  */
5804                                 deleted++;
5805                                 dev->nFreeChunks++;
5806                                 /*T((" %d %d deleted\n",blk,c)); */
5807                         } else if (!tags.chunkUsed) {
5808                                 /* An unassigned chunk in the block
5809                                  * This means that either the block is empty or
5810                                  * this is the one being allocated from
5811                                  */
5812
5813                                 if (c == 0) {
5814                                         /* We're looking at the first chunk in the block so the block is unused */
5815                                         state = YAFFS_BLOCK_STATE_EMPTY;
5816                                         dev->nErasedBlocks++;
5817                                 } else {
5818                                         /* this is the block being allocated from */
5819                                         T(YAFFS_TRACE_SCAN,
5820                                           (TSTR
5821                                            (" Allocating from %d %d" TENDSTR),
5822                                            blk, c));
5823                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
5824                                         dev->allocationBlock = blk;
5825                                         dev->allocationPage = c;
5826                                         dev->allocationBlockFinder = blk;
5827                                         /* Set block finder here to encourage the allocator to go forth from here. */
5828
5829                                 }
5830
5831                                 dev->nFreeChunks += (dev->nChunksPerBlock - c);
5832                         } else if (tags.chunkId > 0) {
5833                                 /* chunkId > 0 so it is a data chunk... */
5834                                 unsigned int endpos;
5835
5836                                 yaffs_SetChunkBit(dev, blk, c);
5837                                 bi->pagesInUse++;
5838
5839                                 in = yaffs_FindOrCreateObjectByNumber(dev,
5840                                                                       tags.
5841                                                                       objectId,
5842                                                                       YAFFS_OBJECT_TYPE_FILE);
5843                                 /* PutChunkIntoFile checks for a clash (two data chunks with
5844                                  * the same chunkId).
5845                                  */
5846
5847                                 if (!in)
5848                                         alloc_failed = 1;
5849
5850                                 if (in) {
5851                                         if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
5852                                                 alloc_failed = 1;
5853                                 }
5854
5855                                 endpos =
5856                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5857                                     tags.byteCount;
5858                                 if (in &&
5859                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
5860                                     && in->variant.fileVariant.scannedFileSize <
5861                                     endpos) {
5862                                         in->variant.fileVariant.
5863                                             scannedFileSize = endpos;
5864                                         if (!dev->useHeaderFileSize) {
5865                                                 in->variant.fileVariant.
5866                                                     fileSize =
5867                                                     in->variant.fileVariant.
5868                                                     scannedFileSize;
5869                                         }
5870
5871                                 }
5872                                 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
5873                         } else {
5874                                 /* chunkId == 0, so it is an ObjectHeader.
5875                                  * Thus, we read in the object header and make the object
5876                                  */
5877                                 yaffs_SetChunkBit(dev, blk, c);
5878                                 bi->pagesInUse++;
5879
5880                                 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
5881                                                                 chunkData,
5882                                                                 NULL);
5883
5884                                 oh = (yaffs_ObjectHeader *) chunkData;
5885
5886                                 in = yaffs_FindObjectByNumber(dev,
5887                                                               tags.objectId);
5888                                 if (in && in->variantType != oh->type) {
5889                                         /* This should not happen, but somehow
5890                                          * Wev'e ended up with an objectId that has been reused but not yet
5891                                          * deleted, and worse still it has changed type. Delete the old object.
5892                                          */
5893
5894                                         yaffs_DeleteObject(in);
5895
5896                                         in = 0;
5897                                 }
5898
5899                                 in = yaffs_FindOrCreateObjectByNumber(dev,
5900                                                                       tags.
5901                                                                       objectId,
5902                                                                       oh->type);
5903
5904                                 if (!in)
5905                                         alloc_failed = 1;
5906
5907                                 if (in && oh->shadowsObject > 0) {
5908
5909                                         struct yaffs_ShadowFixerStruct *fixer;
5910                                         fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
5911                                         if (fixer) {
5912                                                 fixer->next = shadowFixerList;
5913                                                 shadowFixerList = fixer;
5914                                                 fixer->objectId = tags.objectId;
5915                                                 fixer->shadowedId = oh->shadowsObject;
5916                                         }
5917
5918                                 }
5919
5920                                 if (in && in->valid) {
5921                                         /* We have already filled this one. We have a duplicate and need to resolve it. */
5922
5923                                         unsigned existingSerial = in->serial;
5924                                         unsigned newSerial = tags.serialNumber;
5925
5926                                         if (((existingSerial + 1) & 3) == newSerial) {
5927                                                 /* Use new one - destroy the exisiting one */
5928                                                 yaffs_DeleteChunk(dev,
5929                                                                   in->hdrChunk,
5930                                                                   1, __LINE__);
5931                                                 in->valid = 0;
5932                                         } else {
5933                                                 /* Use existing - destroy this one. */
5934                                                 yaffs_DeleteChunk(dev, chunk, 1,
5935                                                                   __LINE__);
5936                                         }
5937                                 }
5938
5939                                 if (in && !in->valid &&
5940                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
5941                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
5942                                         /* We only load some info, don't fiddle with directory structure */
5943                                         in->valid = 1;
5944                                         in->variantType = oh->type;
5945
5946                                         in->yst_mode = oh->yst_mode;
5947 #ifdef CONFIG_YAFFS_WINCE
5948                                         in->win_atime[0] = oh->win_atime[0];
5949                                         in->win_ctime[0] = oh->win_ctime[0];
5950                                         in->win_mtime[0] = oh->win_mtime[0];
5951                                         in->win_atime[1] = oh->win_atime[1];
5952                                         in->win_ctime[1] = oh->win_ctime[1];
5953                                         in->win_mtime[1] = oh->win_mtime[1];
5954 #else
5955                                         in->yst_uid = oh->yst_uid;
5956                                         in->yst_gid = oh->yst_gid;
5957                                         in->yst_atime = oh->yst_atime;
5958                                         in->yst_mtime = oh->yst_mtime;
5959                                         in->yst_ctime = oh->yst_ctime;
5960                                         in->yst_rdev = oh->yst_rdev;
5961 #endif
5962                                         in->hdrChunk = chunk;
5963                                         in->serial = tags.serialNumber;
5964
5965                                 } else if (in && !in->valid) {
5966                                         /* we need to load this info */
5967
5968                                         in->valid = 1;
5969                                         in->variantType = oh->type;
5970
5971                                         in->yst_mode = oh->yst_mode;
5972 #ifdef CONFIG_YAFFS_WINCE
5973                                         in->win_atime[0] = oh->win_atime[0];
5974                                         in->win_ctime[0] = oh->win_ctime[0];
5975                                         in->win_mtime[0] = oh->win_mtime[0];
5976                                         in->win_atime[1] = oh->win_atime[1];
5977                                         in->win_ctime[1] = oh->win_ctime[1];
5978                                         in->win_mtime[1] = oh->win_mtime[1];
5979 #else
5980                                         in->yst_uid = oh->yst_uid;
5981                                         in->yst_gid = oh->yst_gid;
5982                                         in->yst_atime = oh->yst_atime;
5983                                         in->yst_mtime = oh->yst_mtime;
5984                                         in->yst_ctime = oh->yst_ctime;
5985                                         in->yst_rdev = oh->yst_rdev;
5986 #endif
5987                                         in->hdrChunk = chunk;
5988                                         in->serial = tags.serialNumber;
5989
5990                                         yaffs_SetObjectName(in, oh->name);
5991                                         in->dirty = 0;
5992
5993                                         /* directory stuff...
5994                                          * hook up to parent
5995                                          */
5996
5997                                         parent =
5998                                             yaffs_FindOrCreateObjectByNumber
5999                                             (dev, oh->parentObjectId,
6000                                              YAFFS_OBJECT_TYPE_DIRECTORY);
6001                                         if (!parent)
6002                                                 alloc_failed = 1;
6003                                         if (parent && parent->variantType ==
6004                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
6005                                                 /* Set up as a directory */
6006                                                 parent->variantType =
6007                                                         YAFFS_OBJECT_TYPE_DIRECTORY;
6008                                                 YINIT_LIST_HEAD(&parent->variant.
6009                                                                 directoryVariant.
6010                                                                 children);
6011                                         } else if (!parent || parent->variantType !=
6012                                                    YAFFS_OBJECT_TYPE_DIRECTORY) {
6013                                                 /* Hoosterman, another problem....
6014                                                  * We're trying to use a non-directory as a directory
6015                                                  */
6016
6017                                                 T(YAFFS_TRACE_ERROR,
6018                                                   (TSTR
6019                                                    ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6020                                                     TENDSTR)));
6021                                                 parent = dev->lostNFoundDir;
6022                                         }
6023
6024                                         yaffs_AddObjectToDirectory(parent, in);
6025
6026                                         if (0 && (parent == dev->deletedDir ||
6027                                                   parent == dev->unlinkedDir)) {
6028                                                 in->deleted = 1;        /* If it is unlinked at start up then it wants deleting */
6029                                                 dev->nDeletedFiles++;
6030                                         }
6031                                         /* Note re hardlinks.
6032                                          * Since we might scan a hardlink before its equivalent object is scanned
6033                                          * we put them all in a list.
6034                                          * After scanning is complete, we should have all the objects, so we run through this
6035                                          * list and fix up all the chains.
6036                                          */
6037
6038                                         switch (in->variantType) {
6039                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
6040                                                 /* Todo got a problem */
6041                                                 break;
6042                                         case YAFFS_OBJECT_TYPE_FILE:
6043                                                 if (dev->useHeaderFileSize)
6044
6045                                                         in->variant.fileVariant.
6046                                                             fileSize =
6047                                                             oh->fileSize;
6048
6049                                                 break;
6050                                         case YAFFS_OBJECT_TYPE_HARDLINK:
6051                                                 in->variant.hardLinkVariant.
6052                                                         equivalentObjectId =
6053                                                         oh->equivalentObjectId;
6054                                                 in->hardLinks.next =
6055                                                         (struct ylist_head *)
6056                                                         hardList;
6057                                                 hardList = in;
6058                                                 break;
6059                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
6060                                                 /* Do nothing */
6061                                                 break;
6062                                         case YAFFS_OBJECT_TYPE_SPECIAL:
6063                                                 /* Do nothing */
6064                                                 break;
6065                                         case YAFFS_OBJECT_TYPE_SYMLINK:
6066                                                 in->variant.symLinkVariant.alias =
6067                                                     yaffs_CloneString(oh->alias);
6068                                                 if (!in->variant.symLinkVariant.alias)
6069                                                         alloc_failed = 1;
6070                                                 break;
6071                                         }
6072
6073                                 }
6074                         }
6075                 }
6076
6077                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6078                         /* If we got this far while scanning, then the block is fully allocated.*/
6079                         state = YAFFS_BLOCK_STATE_FULL;
6080                 }
6081
6082                 if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
6083                         /* If the block was partially allocated then treat it as fully allocated.*/
6084                         state = YAFFS_BLOCK_STATE_FULL;
6085                         dev->allocationBlock = -1;
6086                 }
6087
6088                 bi->blockState = state;
6089
6090                 /* Now let's see if it was dirty */
6091                 if (bi->pagesInUse == 0 &&
6092                     !bi->hasShrinkHeader &&
6093                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6094                         yaffs_BlockBecameDirty(dev, blk);
6095                 }
6096
6097         }
6098
6099
6100         /* Ok, we've done all the scanning.
6101          * Fix up the hard link chains.
6102          * We should now have scanned all the objects, now it's time to add these
6103          * hardlinks.
6104          */
6105
6106         yaffs_HardlinkFixup(dev, hardList);
6107
6108         /* Fix up any shadowed objects */
6109         {
6110                 struct yaffs_ShadowFixerStruct *fixer;
6111                 yaffs_Object *obj;
6112
6113                 while (shadowFixerList) {
6114                         fixer = shadowFixerList;
6115                         shadowFixerList = fixer->next;
6116                         /* Complete the rename transaction by deleting the shadowed object
6117                          * then setting the object header to unshadowed.
6118                          */
6119                         obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
6120                         if (obj)
6121                                 yaffs_DeleteObject(obj);
6122
6123                         obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
6124
6125                         if (obj)
6126                                 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6127
6128                         YFREE(fixer);
6129                 }
6130         }
6131
6132         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6133
6134         if (alloc_failed)
6135                 return YAFFS_FAIL;
6136
6137         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
6138
6139
6140         return YAFFS_OK;
6141 }
6142
6143 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
6144 {
6145         __u8 *chunkData;
6146         yaffs_ObjectHeader *oh;
6147         yaffs_Device *dev;
6148         yaffs_ExtendedTags tags;
6149         int result;
6150         int alloc_failed = 0;
6151
6152         if (!in)
6153                 return;
6154
6155         dev = in->myDev;
6156
6157 #if 0
6158         T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
6159                 in->objectId,
6160                 in->lazyLoaded ? "not yet" : "already"));
6161 #endif
6162
6163         if (in->lazyLoaded && in->hdrChunk > 0) {
6164                 in->lazyLoaded = 0;
6165                 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6166
6167                 result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
6168                 oh = (yaffs_ObjectHeader *) chunkData;
6169
6170                 in->yst_mode = oh->yst_mode;
6171 #ifdef CONFIG_YAFFS_WINCE
6172                 in->win_atime[0] = oh->win_atime[0];
6173                 in->win_ctime[0] = oh->win_ctime[0];
6174                 in->win_mtime[0] = oh->win_mtime[0];
6175                 in->win_atime[1] = oh->win_atime[1];
6176                 in->win_ctime[1] = oh->win_ctime[1];
6177                 in->win_mtime[1] = oh->win_mtime[1];
6178 #else
6179                 in->yst_uid = oh->yst_uid;
6180                 in->yst_gid = oh->yst_gid;
6181                 in->yst_atime = oh->yst_atime;
6182                 in->yst_mtime = oh->yst_mtime;
6183                 in->yst_ctime = oh->yst_ctime;
6184                 in->yst_rdev = oh->yst_rdev;
6185
6186 #endif
6187                 yaffs_SetObjectName(in, oh->name);
6188
6189                 if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6190                         in->variant.symLinkVariant.alias =
6191                                                     yaffs_CloneString(oh->alias);
6192                         if (!in->variant.symLinkVariant.alias)
6193                                 alloc_failed = 1; /* Not returned to caller */
6194                 }
6195
6196                 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6197         }
6198 }
6199
6200 static int yaffs_ScanBackwards(yaffs_Device *dev)
6201 {
6202         yaffs_ExtendedTags tags;
6203         int blk;
6204         int blockIterator;
6205         int startIterator;
6206         int endIterator;
6207         int nBlocksToScan = 0;
6208
6209         int chunk;
6210         int result;
6211         int c;
6212         int deleted;
6213         yaffs_BlockState state;
6214         yaffs_Object *hardList = NULL;
6215         yaffs_BlockInfo *bi;
6216         __u32 sequenceNumber;
6217         yaffs_ObjectHeader *oh;
6218         yaffs_Object *in;
6219         yaffs_Object *parent;
6220         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
6221         int itsUnlinked;
6222         __u8 *chunkData;
6223
6224         int fileSize;
6225         int isShrink;
6226         int foundChunksInBlock;
6227         int equivalentObjectId;
6228         int alloc_failed = 0;
6229
6230
6231         yaffs_BlockIndex *blockIndex = NULL;
6232         int altBlockIndex = 0;
6233
6234         if (!dev->isYaffs2) {
6235                 T(YAFFS_TRACE_SCAN,
6236                   (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
6237                 return YAFFS_FAIL;
6238         }
6239
6240         T(YAFFS_TRACE_SCAN,
6241           (TSTR
6242            ("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..."
6243             TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
6244
6245
6246         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
6247
6248         blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
6249
6250         if (!blockIndex) {
6251                 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
6252                 altBlockIndex = 1;
6253         }
6254
6255         if (!blockIndex) {
6256                 T(YAFFS_TRACE_SCAN,
6257                   (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
6258                 return YAFFS_FAIL;
6259         }
6260
6261         dev->blocksInCheckpoint = 0;
6262
6263         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6264
6265         /* Scan all the blocks to determine their state */
6266         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6267                 bi = yaffs_GetBlockInfo(dev, blk);
6268                 yaffs_ClearChunkBits(dev, blk);
6269                 bi->pagesInUse = 0;
6270                 bi->softDeletions = 0;
6271
6272                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6273
6274                 bi->blockState = state;
6275                 bi->sequenceNumber = sequenceNumber;
6276
6277                 if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6278                         bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6279                 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6280                         bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6281
6282                 T(YAFFS_TRACE_SCAN_DEBUG,
6283                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6284                    state, sequenceNumber));
6285
6286
6287                 if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
6288                         dev->blocksInCheckpoint++;
6289
6290                 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6291                         T(YAFFS_TRACE_BAD_BLOCKS,
6292                           (TSTR("block %d is bad" TENDSTR), blk));
6293                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6294                         T(YAFFS_TRACE_SCAN_DEBUG,
6295                           (TSTR("Block empty " TENDSTR)));
6296                         dev->nErasedBlocks++;
6297                         dev->nFreeChunks += dev->nChunksPerBlock;
6298                 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6299
6300                         /* Determine the highest sequence number */
6301                         if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6302                             sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6303
6304                                 blockIndex[nBlocksToScan].seq = sequenceNumber;
6305                                 blockIndex[nBlocksToScan].block = blk;
6306
6307                                 nBlocksToScan++;
6308
6309                                 if (sequenceNumber >= dev->sequenceNumber)
6310                                         dev->sequenceNumber = sequenceNumber;
6311                         } else {
6312                                 /* TODO: Nasty sequence number! */
6313                                 T(YAFFS_TRACE_SCAN,
6314                                   (TSTR
6315                                    ("Block scanning block %d has bad sequence number %d"
6316                                     TENDSTR), blk, sequenceNumber));
6317
6318                         }
6319                 }
6320         }
6321
6322         T(YAFFS_TRACE_SCAN,
6323         (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6324
6325
6326
6327         YYIELD();
6328
6329         /* Sort the blocks */
6330 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6331         {
6332                 /* Use qsort now. */
6333                 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6334         }
6335 #else
6336         {
6337                 /* Dungy old bubble sort... */
6338
6339                 yaffs_BlockIndex temp;
6340                 int i;
6341                 int j;
6342
6343                 for (i = 0; i < nBlocksToScan; i++)
6344                         for (j = i + 1; j < nBlocksToScan; j++)
6345                                 if (blockIndex[i].seq > blockIndex[j].seq) {
6346                                         temp = blockIndex[j];
6347                                         blockIndex[j] = blockIndex[i];
6348                                         blockIndex[i] = temp;
6349                                 }
6350         }
6351 #endif
6352
6353         YYIELD();
6354
6355         T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6356
6357         /* Now scan the blocks looking at the data. */
6358         startIterator = 0;
6359         endIterator = nBlocksToScan - 1;
6360         T(YAFFS_TRACE_SCAN_DEBUG,
6361           (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6362
6363         /* For each block.... backwards */
6364         for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6365                         blockIterator--) {
6366                 /* Cooperative multitasking! This loop can run for so
6367                    long that watchdog timers expire. */
6368                 YYIELD();
6369
6370                 /* get the block to scan in the correct order */
6371                 blk = blockIndex[blockIterator].block;
6372
6373                 bi = yaffs_GetBlockInfo(dev, blk);
6374
6375
6376                 state = bi->blockState;
6377
6378                 deleted = 0;
6379
6380                 /* For each chunk in each block that needs scanning.... */
6381                 foundChunksInBlock = 0;
6382                 for (c = dev->nChunksPerBlock - 1;
6383                      !alloc_failed && c >= 0 &&
6384                      (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6385                       state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6386                         /* Scan backwards...
6387                          * Read the tags and decide what to do
6388                          */
6389
6390                         chunk = blk * dev->nChunksPerBlock + c;
6391
6392                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6393                                                         &tags);
6394
6395                         /* Let's have a good look at this chunk... */
6396
6397                         if (!tags.chunkUsed) {
6398                                 /* An unassigned chunk in the block.
6399                                  * If there are used chunks after this one, then
6400                                  * it is a chunk that was skipped due to failing the erased
6401                                  * check. Just skip it so that it can be deleted.
6402                                  * But, more typically, We get here when this is an unallocated
6403                                  * chunk and his means that either the block is empty or
6404                                  * this is the one being allocated from
6405                                  */
6406
6407                                 if (foundChunksInBlock) {
6408                                         /* This is a chunk that was skipped due to failing the erased check */
6409                                 } else if (c == 0) {
6410                                         /* We're looking at the first chunk in the block so the block is unused */
6411                                         state = YAFFS_BLOCK_STATE_EMPTY;
6412                                         dev->nErasedBlocks++;
6413                                 } else {
6414                                         if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6415                                             state == YAFFS_BLOCK_STATE_ALLOCATING) {
6416                                                 if (dev->sequenceNumber == bi->sequenceNumber) {
6417                                                         /* this is the block being allocated from */
6418
6419                                                         T(YAFFS_TRACE_SCAN,
6420                                                           (TSTR
6421                                                            (" Allocating from %d %d"
6422                                                             TENDSTR), blk, c));
6423
6424                                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
6425                                                         dev->allocationBlock = blk;
6426                                                         dev->allocationPage = c;
6427                                                         dev->allocationBlockFinder = blk;
6428                                                 } else {
6429                                                         /* This is a partially written block that is not
6430                                                          * the current allocation block.
6431                                                          */
6432
6433                                                          T(YAFFS_TRACE_ALWAYS,
6434                                                          (TSTR("Partially written block %d detected" TENDSTR),
6435                                                          blk));
6436                                                 }
6437                                         }
6438                                 }
6439
6440                                 dev->nFreeChunks++;
6441
6442                         } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
6443                                 T(YAFFS_TRACE_SCAN,
6444                                   (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
6445                                   blk, c));
6446
6447                                   dev->nFreeChunks++;
6448
6449                         } else if (tags.chunkId > 0) {
6450                                 /* chunkId > 0 so it is a data chunk... */
6451                                 unsigned int endpos;
6452                                 __u32 chunkBase =
6453                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6454
6455                                 foundChunksInBlock = 1;
6456
6457
6458                                 yaffs_SetChunkBit(dev, blk, c);
6459                                 bi->pagesInUse++;
6460
6461                                 in = yaffs_FindOrCreateObjectByNumber(dev,
6462                                                                       tags.
6463                                                                       objectId,
6464                                                                       YAFFS_OBJECT_TYPE_FILE);
6465                                 if (!in) {
6466                                         /* Out of memory */
6467                                         alloc_failed = 1;
6468                                 }
6469
6470                                 if (in &&
6471                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
6472                                     && chunkBase <
6473                                     in->variant.fileVariant.shrinkSize) {
6474                                         /* This has not been invalidated by a resize */
6475                                         if (!yaffs_PutChunkIntoFile(in, tags.chunkId,
6476                                                                chunk, -1)) {
6477                                                 alloc_failed = 1;
6478                                         }
6479
6480                                         /* File size is calculated by looking at the data chunks if we have not
6481                                          * seen an object header yet. Stop this practice once we find an object header.
6482                                          */
6483                                         endpos =
6484                                             (tags.chunkId -
6485                                              1) * dev->nDataBytesPerChunk +
6486                                             tags.byteCount;
6487
6488                                         if (!in->valid &&       /* have not got an object header yet */
6489                                             in->variant.fileVariant.
6490                                             scannedFileSize < endpos) {
6491                                                 in->variant.fileVariant.
6492                                                     scannedFileSize = endpos;
6493                                                 in->variant.fileVariant.
6494                                                     fileSize =
6495                                                     in->variant.fileVariant.
6496                                                     scannedFileSize;
6497                                         }
6498
6499                                 } else if (in) {
6500                                         /* This chunk has been invalidated by a resize, so delete */
6501                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6502
6503                                 }
6504                         } else {
6505                                 /* chunkId == 0, so it is an ObjectHeader.
6506                                  * Thus, we read in the object header and make the object
6507                                  */
6508                                 foundChunksInBlock = 1;
6509
6510                                 yaffs_SetChunkBit(dev, blk, c);
6511                                 bi->pagesInUse++;
6512
6513                                 oh = NULL;
6514                                 in = NULL;
6515
6516                                 if (tags.extraHeaderInfoAvailable) {
6517                                         in = yaffs_FindOrCreateObjectByNumber
6518                                             (dev, tags.objectId,
6519                                              tags.extraObjectType);
6520                                         if (!in)
6521                                                 alloc_failed = 1;
6522                                 }
6523
6524                                 if (!in ||
6525                                     (!in->valid && dev->disableLazyLoad) ||
6526                                     tags.extraShadows ||
6527                                     (!in->valid &&
6528                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6529                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
6530
6531                                         /* If we don't have  valid info then we need to read the chunk
6532                                          * TODO In future we can probably defer reading the chunk and
6533                                          * living with invalid data until needed.
6534                                          */
6535
6536                                         result = yaffs_ReadChunkWithTagsFromNAND(dev,
6537                                                                         chunk,
6538                                                                         chunkData,
6539                                                                         NULL);
6540
6541                                         oh = (yaffs_ObjectHeader *) chunkData;
6542
6543                                         if (dev->inbandTags) {
6544                                                 /* Fix up the header if they got corrupted by inband tags */
6545                                                 oh->shadowsObject = oh->inbandShadowsObject;
6546                                                 oh->isShrink = oh->inbandIsShrink;
6547                                         }
6548
6549                                         if (!in) {
6550                                                 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6551                                                 if (!in)
6552                                                         alloc_failed = 1;
6553                                         }
6554
6555                                 }
6556
6557                                 if (!in) {
6558                                         /* TODO Hoosterman we have a problem! */
6559                                         T(YAFFS_TRACE_ERROR,
6560                                           (TSTR
6561                                            ("yaffs tragedy: Could not make object for object  %d at chunk %d during scan"
6562                                             TENDSTR), tags.objectId, chunk));
6563                                         continue;
6564                                 }
6565
6566                                 if (in->valid) {
6567                                         /* We have already filled this one.
6568                                          * We have a duplicate that will be discarded, but
6569                                          * we first have to suck out resize info if it is a file.
6570                                          */
6571
6572                                         if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6573                                              ((oh &&
6574                                                oh->type == YAFFS_OBJECT_TYPE_FILE) ||
6575                                               (tags.extraHeaderInfoAvailable  &&
6576                                                tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
6577                                                 __u32 thisSize =
6578                                                     (oh) ? oh->fileSize : tags.
6579                                                     extraFileLength;
6580                                                 __u32 parentObjectId =
6581                                                     (oh) ? oh->
6582                                                     parentObjectId : tags.
6583                                                     extraParentObjectId;
6584
6585
6586                                                 isShrink =
6587                                                     (oh) ? oh->isShrink : tags.
6588                                                     extraIsShrinkHeader;
6589
6590                                                 /* If it is deleted (unlinked at start also means deleted)
6591                                                  * we treat the file size as being zeroed at this point.
6592                                                  */
6593                                                 if (parentObjectId ==
6594                                                     YAFFS_OBJECTID_DELETED
6595                                                     || parentObjectId ==
6596                                                     YAFFS_OBJECTID_UNLINKED) {
6597                                                         thisSize = 0;
6598                                                         isShrink = 1;
6599                                                 }
6600
6601                                                 if (isShrink &&
6602                                                     in->variant.fileVariant.
6603                                                     shrinkSize > thisSize) {
6604                                                         in->variant.fileVariant.
6605                                                             shrinkSize =
6606                                                             thisSize;
6607                                                 }
6608
6609                                                 if (isShrink)
6610                                                         bi->hasShrinkHeader = 1;
6611
6612                                         }
6613                                         /* Use existing - destroy this one. */
6614                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6615
6616                                 }
6617
6618                                 if (!in->valid && in->variantType !=
6619                                     (oh ? oh->type : tags.extraObjectType))
6620                                         T(YAFFS_TRACE_ERROR, (
6621                                                 TSTR("yaffs tragedy: Bad object type, "
6622                                             TCONT("%d != %d, for object %d at chunk ")
6623                                             TCONT("%d during scan")
6624                                                 TENDSTR), oh ?
6625                                             oh->type : tags.extraObjectType,
6626                                             in->variantType, tags.objectId,
6627                                             chunk));
6628
6629                                 if (!in->valid &&
6630                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6631                                      tags.objectId ==
6632                                      YAFFS_OBJECTID_LOSTNFOUND)) {
6633                                         /* We only load some info, don't fiddle with directory structure */
6634                                         in->valid = 1;
6635
6636                                         if (oh) {
6637                                                 in->variantType = oh->type;
6638
6639                                                 in->yst_mode = oh->yst_mode;
6640 #ifdef CONFIG_YAFFS_WINCE
6641                                                 in->win_atime[0] = oh->win_atime[0];
6642                                                 in->win_ctime[0] = oh->win_ctime[0];
6643                                                 in->win_mtime[0] = oh->win_mtime[0];
6644                                                 in->win_atime[1] = oh->win_atime[1];
6645                                                 in->win_ctime[1] = oh->win_ctime[1];
6646                                                 in->win_mtime[1] = oh->win_mtime[1];
6647 #else
6648                                                 in->yst_uid = oh->yst_uid;
6649                                                 in->yst_gid = oh->yst_gid;
6650                                                 in->yst_atime = oh->yst_atime;
6651                                                 in->yst_mtime = oh->yst_mtime;
6652                                                 in->yst_ctime = oh->yst_ctime;
6653                                                 in->yst_rdev = oh->yst_rdev;
6654
6655 #endif
6656                                         } else {
6657                                                 in->variantType = tags.extraObjectType;
6658                                                 in->lazyLoaded = 1;
6659                                         }
6660
6661                                         in->hdrChunk = chunk;
6662
6663                                 } else if (!in->valid) {
6664                                         /* we need to load this info */
6665
6666                                         in->valid = 1;
6667                                         in->hdrChunk = chunk;
6668
6669                                         if (oh) {
6670                                                 in->variantType = oh->type;
6671
6672                                                 in->yst_mode = oh->yst_mode;
6673 #ifdef CONFIG_YAFFS_WINCE
6674                                                 in->win_atime[0] = oh->win_atime[0];
6675                                                 in->win_ctime[0] = oh->win_ctime[0];
6676                                                 in->win_mtime[0] = oh->win_mtime[0];
6677                                                 in->win_atime[1] = oh->win_atime[1];
6678                                                 in->win_ctime[1] = oh->win_ctime[1];
6679                                                 in->win_mtime[1] = oh->win_mtime[1];
6680 #else
6681                                                 in->yst_uid = oh->yst_uid;
6682                                                 in->yst_gid = oh->yst_gid;
6683                                                 in->yst_atime = oh->yst_atime;
6684                                                 in->yst_mtime = oh->yst_mtime;
6685                                                 in->yst_ctime = oh->yst_ctime;
6686                                                 in->yst_rdev = oh->yst_rdev;
6687 #endif
6688
6689                                                 if (oh->shadowsObject > 0)
6690                                                         yaffs_HandleShadowedObject(dev,
6691                                                                            oh->
6692                                                                            shadowsObject,
6693                                                                            1);
6694
6695
6696
6697                                                 yaffs_SetObjectName(in, oh->name);
6698                                                 parent =
6699                                                     yaffs_FindOrCreateObjectByNumber
6700                                                         (dev, oh->parentObjectId,
6701                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6702
6703                                                  fileSize = oh->fileSize;
6704                                                  isShrink = oh->isShrink;
6705                                                  equivalentObjectId = oh->equivalentObjectId;
6706
6707                                         } else {
6708                                                 in->variantType = tags.extraObjectType;
6709                                                 parent =
6710                                                     yaffs_FindOrCreateObjectByNumber
6711                                                         (dev, tags.extraParentObjectId,
6712                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6713                                                  fileSize = tags.extraFileLength;
6714                                                  isShrink = tags.extraIsShrinkHeader;
6715                                                  equivalentObjectId = tags.extraEquivalentObjectId;
6716                                                 in->lazyLoaded = 1;
6717
6718                                         }
6719                                         in->dirty = 0;
6720
6721                                         if (!parent)
6722                                                 alloc_failed = 1;
6723
6724                                         /* directory stuff...
6725                                          * hook up to parent
6726                                          */
6727
6728                                         if (parent && parent->variantType ==
6729                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
6730                                                 /* Set up as a directory */
6731                                                 parent->variantType =
6732                                                         YAFFS_OBJECT_TYPE_DIRECTORY;
6733                                                 YINIT_LIST_HEAD(&parent->variant.
6734                                                         directoryVariant.
6735                                                         children);
6736                                         } else if (!parent || parent->variantType !=
6737                                                    YAFFS_OBJECT_TYPE_DIRECTORY) {
6738                                                 /* Hoosterman, another problem....
6739                                                  * We're trying to use a non-directory as a directory
6740                                                  */
6741
6742                                                 T(YAFFS_TRACE_ERROR,
6743                                                   (TSTR
6744                                                    ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6745                                                     TENDSTR)));
6746                                                 parent = dev->lostNFoundDir;
6747                                         }
6748
6749                                         yaffs_AddObjectToDirectory(parent, in);
6750
6751                                         itsUnlinked = (parent == dev->deletedDir) ||
6752                                                       (parent == dev->unlinkedDir);
6753
6754                                         if (isShrink) {
6755                                                 /* Mark the block as having a shrinkHeader */
6756                                                 bi->hasShrinkHeader = 1;
6757                                         }
6758
6759                                         /* Note re hardlinks.
6760                                          * Since we might scan a hardlink before its equivalent object is scanned
6761                                          * we put them all in a list.
6762                                          * After scanning is complete, we should have all the objects, so we run
6763                                          * through this list and fix up all the chains.
6764                                          */
6765
6766                                         switch (in->variantType) {
6767                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
6768                                                 /* Todo got a problem */
6769                                                 break;
6770                                         case YAFFS_OBJECT_TYPE_FILE:
6771
6772                                                 if (in->variant.fileVariant.
6773                                                     scannedFileSize < fileSize) {
6774                                                         /* This covers the case where the file size is greater
6775                                                          * than where the data is
6776                                                          * This will happen if the file is resized to be larger
6777                                                          * than its current data extents.
6778                                                          */
6779                                                         in->variant.fileVariant.fileSize = fileSize;
6780                                                         in->variant.fileVariant.scannedFileSize =
6781                                                             in->variant.fileVariant.fileSize;
6782                                                 }
6783
6784                                                 if (isShrink &&
6785                                                     in->variant.fileVariant.shrinkSize > fileSize) {
6786                                                         in->variant.fileVariant.shrinkSize = fileSize;
6787                                                 }
6788
6789                                                 break;
6790                                         case YAFFS_OBJECT_TYPE_HARDLINK:
6791                                                 if (!itsUnlinked) {
6792                                                         in->variant.hardLinkVariant.equivalentObjectId =
6793                                                                 equivalentObjectId;
6794                                                         in->hardLinks.next =
6795                                                                 (struct ylist_head *) hardList;
6796                                                         hardList = in;
6797                                                 }
6798                                                 break;
6799                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
6800                                                 /* Do nothing */
6801                                                 break;
6802                                         case YAFFS_OBJECT_TYPE_SPECIAL:
6803                                                 /* Do nothing */
6804                                                 break;
6805                                         case YAFFS_OBJECT_TYPE_SYMLINK:
6806                                                 if (oh) {
6807                                                         in->variant.symLinkVariant.alias =
6808                                                                 yaffs_CloneString(oh->alias);
6809                                                         if (!in->variant.symLinkVariant.alias)
6810                                                                 alloc_failed = 1;
6811                                                 }
6812                                                 break;
6813                                         }
6814
6815                                 }
6816
6817                         }
6818
6819                 } /* End of scanning for each chunk */
6820
6821                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6822                         /* If we got this far while scanning, then the block is fully allocated. */
6823                         state = YAFFS_BLOCK_STATE_FULL;
6824                 }
6825
6826
6827                 bi->blockState = state;
6828
6829                 /* Now let's see if it was dirty */
6830                 if (bi->pagesInUse == 0 &&
6831                     !bi->hasShrinkHeader &&
6832                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6833                         yaffs_BlockBecameDirty(dev, blk);
6834                 }
6835
6836         }
6837
6838         yaffs_SkipRestOfBlock(dev);
6839
6840         if (altBlockIndex)
6841                 YFREE_ALT(blockIndex);
6842         else
6843                 YFREE(blockIndex);
6844
6845         /* Ok, we've done all the scanning.
6846          * Fix up the hard link chains.
6847          * We should now have scanned all the objects, now it's time to add these
6848          * hardlinks.
6849          */
6850         yaffs_HardlinkFixup(dev, hardList);
6851
6852
6853         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6854
6855         if (alloc_failed)
6856                 return YAFFS_FAIL;
6857
6858         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6859
6860         return YAFFS_OK;
6861 }
6862
6863 /*------------------------------  Directory Functions ----------------------------- */
6864
6865 static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
6866 {
6867         struct ylist_head *lh;
6868         yaffs_Object *listObj;
6869
6870         int count = 0;
6871
6872         if (!obj) {
6873                 T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
6874                 YBUG();
6875                 return;
6876         }
6877
6878         if (yaffs_SkipVerification(obj->myDev))
6879                 return;
6880
6881         if (!obj->parent) {
6882                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
6883                 YBUG();
6884                 return;
6885         }
6886
6887         if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6888                 T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
6889                 YBUG();
6890         }
6891
6892         /* Iterate through the objects in each hash entry */
6893
6894         ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
6895                 if (lh) {
6896                         listObj = ylist_entry(lh, yaffs_Object, siblings);
6897                         yaffs_VerifyObject(listObj);
6898                         if (obj == listObj)
6899                                 count++;
6900                 }
6901          }
6902
6903         if (count != 1) {
6904                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
6905                 YBUG();
6906         }
6907 }
6908
6909 static void yaffs_VerifyDirectory(yaffs_Object *directory)
6910 {
6911         struct ylist_head *lh;
6912         yaffs_Object *listObj;
6913
6914         if (!directory) {
6915                 YBUG();
6916                 return;
6917         }
6918
6919         if (yaffs_SkipFullVerification(directory->myDev))
6920                 return;
6921
6922         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6923                 T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
6924                 YBUG();
6925         }
6926
6927         /* Iterate through the objects in each hash entry */
6928
6929         ylist_for_each(lh, &directory->variant.directoryVariant.children) {
6930                 if (lh) {
6931                         listObj = ylist_entry(lh, yaffs_Object, siblings);
6932                         if (listObj->parent != directory) {
6933                                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
6934                                 YBUG();
6935                         }
6936                         yaffs_VerifyObjectInDirectory(listObj);
6937                 }
6938         }
6939 }
6940
6941 /*
6942  *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
6943  * link (ie. name) is created or deleted in the directory.
6944  *
6945  * ie.
6946  *   create dir/a : update dir's mtime/ctime
6947  *   rm dir/a:   update dir's mtime/ctime
6948  *   modify dir/a: don't update dir's mtimme/ctime
6949  */
6950
6951 static void yaffs_UpdateParent(yaffs_Object *obj)
6952 {
6953         if(!obj)
6954                 return;
6955
6956         obj->dirty = 1;
6957         obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
6958
6959         yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
6960 }
6961
6962 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
6963 {
6964         yaffs_Device *dev = obj->myDev;
6965         yaffs_Object *parent;
6966
6967         yaffs_VerifyObjectInDirectory(obj);
6968         parent = obj->parent;
6969
6970         yaffs_VerifyDirectory(parent);
6971
6972         if (dev && dev->removeObjectCallback)
6973                 dev->removeObjectCallback(obj);
6974
6975
6976         ylist_del_init(&obj->siblings);
6977         obj->parent = NULL;
6978
6979         yaffs_VerifyDirectory(parent);
6980 }
6981
6982 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
6983                                         yaffs_Object *obj)
6984 {
6985         if (!directory) {
6986                 T(YAFFS_TRACE_ALWAYS,
6987                   (TSTR
6988                    ("tragedy: Trying to add an object to a null pointer directory"
6989                     TENDSTR)));
6990                 YBUG();
6991                 return;
6992         }
6993         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6994                 T(YAFFS_TRACE_ALWAYS,
6995                   (TSTR
6996                    ("tragedy: Trying to add an object to a non-directory"
6997                     TENDSTR)));
6998                 YBUG();
6999         }
7000
7001         if (obj->siblings.prev == NULL) {
7002                 /* Not initialised */
7003                 YBUG();
7004         }
7005
7006
7007         yaffs_VerifyDirectory(directory);
7008
7009         yaffs_RemoveObjectFromDirectory(obj);
7010
7011
7012         /* Now add it */
7013         ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
7014         obj->parent = directory;
7015
7016         if (directory == obj->myDev->unlinkedDir
7017                         || directory == obj->myDev->deletedDir) {
7018                 obj->unlinked = 1;
7019                 obj->myDev->nUnlinkedFiles++;
7020                 obj->renameAllowed = 0;
7021         }
7022
7023         yaffs_VerifyDirectory(directory);
7024         yaffs_VerifyObjectInDirectory(obj);
7025 }
7026
7027 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
7028                                      const YCHAR *name)
7029 {
7030         int sum;
7031
7032         struct ylist_head *i;
7033         YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
7034
7035         yaffs_Object *l;
7036
7037         if (!name)
7038                 return NULL;
7039
7040         if (!directory) {
7041                 T(YAFFS_TRACE_ALWAYS,
7042                   (TSTR
7043                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
7044                     TENDSTR)));
7045                 YBUG();
7046                 return NULL;
7047         }
7048         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7049                 T(YAFFS_TRACE_ALWAYS,
7050                   (TSTR
7051                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7052                 YBUG();
7053         }
7054
7055         sum = yaffs_CalcNameSum(name);
7056
7057         ylist_for_each(i, &directory->variant.directoryVariant.children) {
7058                 if (i) {
7059                         l = ylist_entry(i, yaffs_Object, siblings);
7060
7061                         if (l->parent != directory)
7062                                 YBUG();
7063
7064                         yaffs_CheckObjectDetailsLoaded(l);
7065
7066                         /* Special case for lost-n-found */
7067                         if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7068                                 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
7069                                         return l;
7070                         } else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
7071                                 /* LostnFound chunk called Objxxx
7072                                  * Do a real check
7073                                  */
7074                                 yaffs_GetObjectName(l, buffer,
7075                                                     YAFFS_MAX_NAME_LENGTH + 1);
7076                                 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
7077                                         return l;
7078                         }
7079                 }
7080         }
7081
7082         return NULL;
7083 }
7084
7085
7086 #if 0
7087 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
7088                                         int (*fn) (yaffs_Object *))
7089 {
7090         struct ylist_head *i;
7091         yaffs_Object *l;
7092
7093         if (!theDir) {
7094                 T(YAFFS_TRACE_ALWAYS,
7095                   (TSTR
7096                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
7097                     TENDSTR)));
7098                 YBUG();
7099                 return YAFFS_FAIL;
7100         }
7101         if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7102                 T(YAFFS_TRACE_ALWAYS,
7103                   (TSTR
7104                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7105                 YBUG();
7106                 return YAFFS_FAIL;
7107         }
7108
7109         ylist_for_each(i, &theDir->variant.directoryVariant.children) {
7110                 if (i) {
7111                         l = ylist_entry(i, yaffs_Object, siblings);
7112                         if (l && !fn(l))
7113                                 return YAFFS_FAIL;
7114                 }
7115         }
7116
7117         return YAFFS_OK;
7118
7119 }
7120 #endif
7121
7122 /* GetEquivalentObject dereferences any hard links to get to the
7123  * actual object.
7124  */
7125
7126 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
7127 {
7128         if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
7129                 /* We want the object id of the equivalent object, not this one */
7130                 obj = obj->variant.hardLinkVariant.equivalentObject;
7131                 yaffs_CheckObjectDetailsLoaded(obj);
7132         }
7133         return obj;
7134 }
7135
7136 int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
7137 {
7138         memset(name, 0, buffSize * sizeof(YCHAR));
7139
7140         yaffs_CheckObjectDetailsLoaded(obj);
7141
7142         if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7143                 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
7144         } else if (obj->hdrChunk <= 0) {
7145                 YCHAR locName[20];
7146                 YCHAR numString[20];
7147                 YCHAR *x = &numString[19];
7148                 unsigned v = obj->objectId;
7149                 numString[19] = 0;
7150                 while (v > 0) {
7151                         x--;
7152                         *x = '0' + (v % 10);
7153                         v /= 10;
7154                 }
7155                 /* make up a name */
7156                 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
7157                 yaffs_strcat(locName, x);
7158                 yaffs_strncpy(name, locName, buffSize - 1);
7159
7160         }
7161 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
7162         else if (obj->shortName[0])
7163                 yaffs_strncpy(name, obj->shortName,YAFFS_SHORT_NAME_LENGTH+1);
7164 #endif
7165         else {
7166                 int result;
7167                 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
7168
7169                 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
7170
7171                 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
7172
7173                 if (obj->hdrChunk > 0) {
7174                         result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
7175                                                         obj->hdrChunk, buffer,
7176                                                         NULL);
7177                 }
7178                 yaffs_strncpy(name, oh->name, buffSize - 1);
7179                 name[buffSize-1]=0;
7180
7181                 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
7182         }
7183
7184         return yaffs_strnlen(name,buffSize-1);
7185 }
7186
7187 int yaffs_GetObjectFileLength(yaffs_Object *obj)
7188 {
7189         /* Dereference any hard linking */
7190         obj = yaffs_GetEquivalentObject(obj);
7191
7192         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
7193                 return obj->variant.fileVariant.fileSize;
7194         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
7195                 if(!obj->variant.symLinkVariant.alias)
7196                         return 0;
7197                 return yaffs_strnlen(obj->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
7198         } else {
7199                 /* Only a directory should drop through to here */
7200                 return obj->myDev->nDataBytesPerChunk;
7201         }
7202 }
7203
7204 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
7205 {
7206         int count = 0;
7207         struct ylist_head *i;
7208
7209         if (!obj->unlinked)
7210                 count++;                /* the object itself */
7211
7212         ylist_for_each(i, &obj->hardLinks)
7213                 count++;                /* add the hard links; */
7214
7215         return count;
7216 }
7217
7218 int yaffs_GetObjectInode(yaffs_Object *obj)
7219 {
7220         obj = yaffs_GetEquivalentObject(obj);
7221
7222         return obj->objectId;
7223 }
7224
7225 unsigned yaffs_GetObjectType(yaffs_Object *obj)
7226 {
7227         obj = yaffs_GetEquivalentObject(obj);
7228
7229         switch (obj->variantType) {
7230         case YAFFS_OBJECT_TYPE_FILE:
7231                 return DT_REG;
7232                 break;
7233         case YAFFS_OBJECT_TYPE_DIRECTORY:
7234                 return DT_DIR;
7235                 break;
7236         case YAFFS_OBJECT_TYPE_SYMLINK:
7237                 return DT_LNK;
7238                 break;
7239         case YAFFS_OBJECT_TYPE_HARDLINK:
7240                 return DT_REG;
7241                 break;
7242         case YAFFS_OBJECT_TYPE_SPECIAL:
7243                 if (S_ISFIFO(obj->yst_mode))
7244                         return DT_FIFO;
7245                 if (S_ISCHR(obj->yst_mode))
7246                         return DT_CHR;
7247                 if (S_ISBLK(obj->yst_mode))
7248                         return DT_BLK;
7249                 if (S_ISSOCK(obj->yst_mode))
7250                         return DT_SOCK;
7251         default:
7252                 return DT_REG;
7253                 break;
7254         }
7255 }
7256
7257 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
7258 {
7259         obj = yaffs_GetEquivalentObject(obj);
7260         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
7261                 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
7262         else
7263                 return yaffs_CloneString(_Y(""));
7264 }
7265
7266 #ifndef CONFIG_YAFFS_WINCE
7267
7268 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
7269 {
7270         unsigned int valid = attr->ia_valid;
7271
7272         if (valid & ATTR_MODE)
7273                 obj->yst_mode = attr->ia_mode;
7274         if (valid & ATTR_UID)
7275                 obj->yst_uid = attr->ia_uid;
7276         if (valid & ATTR_GID)
7277                 obj->yst_gid = attr->ia_gid;
7278
7279         if (valid & ATTR_ATIME)
7280                 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
7281         if (valid & ATTR_CTIME)
7282                 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
7283         if (valid & ATTR_MTIME)
7284                 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
7285
7286         if (valid & ATTR_SIZE)
7287                 yaffs_ResizeFile(obj, attr->ia_size);
7288
7289         yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
7290
7291         return YAFFS_OK;
7292
7293 }
7294 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
7295 {
7296         unsigned int valid = 0;
7297
7298         attr->ia_mode = obj->yst_mode;
7299         valid |= ATTR_MODE;
7300         attr->ia_uid = obj->yst_uid;
7301         valid |= ATTR_UID;
7302         attr->ia_gid = obj->yst_gid;
7303         valid |= ATTR_GID;
7304
7305         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
7306         valid |= ATTR_ATIME;
7307         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
7308         valid |= ATTR_CTIME;
7309         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
7310         valid |= ATTR_MTIME;
7311
7312         attr->ia_size = yaffs_GetFileSize(obj);
7313         valid |= ATTR_SIZE;
7314
7315         attr->ia_valid = valid;
7316
7317         return YAFFS_OK;
7318 }
7319
7320 #endif
7321
7322 #if 0
7323 int yaffs_DumpObject(yaffs_Object *obj)
7324 {
7325         YCHAR name[257];
7326
7327         yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
7328
7329         T(YAFFS_TRACE_ALWAYS,
7330           (TSTR
7331            ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
7332             " chunk %d type %d size %d\n"
7333             TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
7334            obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
7335            yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
7336
7337         return YAFFS_OK;
7338 }
7339 #endif
7340
7341 /*---------------------------- Initialisation code -------------------------------------- */
7342
7343 static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
7344 {
7345
7346         /* Common functions, gotta have */
7347         if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
7348                 return 0;
7349
7350 #ifdef CONFIG_YAFFS_YAFFS2
7351
7352         /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
7353         if (dev->writeChunkWithTagsToNAND &&
7354             dev->readChunkWithTagsFromNAND &&
7355             !dev->writeChunkToNAND &&
7356             !dev->readChunkFromNAND &&
7357             dev->markNANDBlockBad && dev->queryNANDBlock)
7358                 return 1;
7359 #endif
7360
7361         /* Can use the "spare" style interface for yaffs1 */
7362         if (!dev->isYaffs2 &&
7363             !dev->writeChunkWithTagsToNAND &&
7364             !dev->readChunkWithTagsFromNAND &&
7365             dev->writeChunkToNAND &&
7366             dev->readChunkFromNAND &&
7367             !dev->markNANDBlockBad && !dev->queryNANDBlock)
7368                 return 1;
7369
7370         return 0;               /* bad */
7371 }
7372
7373
7374 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7375 {
7376         /* Initialise the unlinked, deleted, root and lost and found directories */
7377
7378         dev->lostNFoundDir = dev->rootDir =  NULL;
7379         dev->unlinkedDir = dev->deletedDir = NULL;
7380
7381         dev->unlinkedDir =
7382             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7383
7384         dev->deletedDir =
7385             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7386
7387         dev->rootDir =
7388             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7389                                       YAFFS_ROOT_MODE | S_IFDIR);
7390         dev->lostNFoundDir =
7391             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7392                                       YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7393
7394         if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
7395                 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7396                 return YAFFS_OK;
7397         }
7398
7399         return YAFFS_FAIL;
7400 }
7401
7402 int yaffs_GutsInitialise(yaffs_Device *dev)
7403 {
7404         int init_failed = 0;
7405         unsigned x;
7406         int bits;
7407
7408         T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7409
7410         /* Check stuff that must be set */
7411
7412         if (!dev) {
7413                 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7414                 return YAFFS_FAIL;
7415         }
7416
7417         dev->internalStartBlock = dev->startBlock;
7418         dev->internalEndBlock = dev->endBlock;
7419         dev->blockOffset = 0;
7420         dev->chunkOffset = 0;
7421         dev->nFreeChunks = 0;
7422
7423         dev->gcBlock = -1;
7424
7425         if (dev->startBlock == 0) {
7426                 dev->internalStartBlock = dev->startBlock + 1;
7427                 dev->internalEndBlock = dev->endBlock + 1;
7428                 dev->blockOffset = 1;
7429                 dev->chunkOffset = dev->nChunksPerBlock;
7430         }
7431
7432         /* Check geometry parameters. */
7433
7434         if ((!dev->inbandTags && dev->isYaffs2 && dev->totalBytesPerChunk < 1024) ||
7435             (!dev->isYaffs2 && dev->totalBytesPerChunk < 512) ||
7436             (dev->inbandTags && !dev->isYaffs2) ||
7437              dev->nChunksPerBlock < 2 ||
7438              dev->nReservedBlocks < 2 ||
7439              dev->internalStartBlock <= 0 ||
7440              dev->internalEndBlock <= 0 ||
7441              dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2)) {   /* otherwise it is too small */
7442                 T(YAFFS_TRACE_ALWAYS,
7443                   (TSTR
7444                    ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
7445                     TENDSTR), dev->totalBytesPerChunk, dev->isYaffs2 ? "2" : "", dev->inbandTags));
7446                 return YAFFS_FAIL;
7447         }
7448
7449         if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7450                 T(YAFFS_TRACE_ALWAYS,
7451                   (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7452                 return YAFFS_FAIL;
7453         }
7454
7455         /* Sort out space for inband tags, if required */
7456         if (dev->inbandTags)
7457                 dev->nDataBytesPerChunk = dev->totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
7458         else
7459                 dev->nDataBytesPerChunk = dev->totalBytesPerChunk;
7460
7461         /* Got the right mix of functions? */
7462         if (!yaffs_CheckDevFunctions(dev)) {
7463                 /* Function missing */
7464                 T(YAFFS_TRACE_ALWAYS,
7465                   (TSTR
7466                    ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7467
7468                 return YAFFS_FAIL;
7469         }
7470
7471         /* This is really a compilation check. */
7472         if (!yaffs_CheckStructures()) {
7473                 T(YAFFS_TRACE_ALWAYS,
7474                   (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7475                 return YAFFS_FAIL;
7476         }
7477
7478         if (dev->isMounted) {
7479                 T(YAFFS_TRACE_ALWAYS,
7480                   (TSTR("yaffs: device already mounted\n" TENDSTR)));
7481                 return YAFFS_FAIL;
7482         }
7483
7484         /* Finished with most checks. One or two more checks happen later on too. */
7485
7486         dev->isMounted = 1;
7487
7488         /* OK now calculate a few things for the device */
7489
7490         /*
7491          *  Calculate all the chunk size manipulation numbers:
7492          */
7493         x = dev->nDataBytesPerChunk;
7494         /* We always use dev->chunkShift and dev->chunkDiv */
7495         dev->chunkShift = Shifts(x);
7496         x >>= dev->chunkShift;
7497         dev->chunkDiv = x;
7498         /* We only use chunk mask if chunkDiv is 1 */
7499         dev->chunkMask = (1<<dev->chunkShift) - 1;
7500
7501         /*
7502          * Calculate chunkGroupBits.
7503          * We need to find the next power of 2 > than internalEndBlock
7504          */
7505
7506         x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
7507
7508         bits = ShiftsGE(x);
7509
7510         /* Set up tnode width if wide tnodes are enabled. */
7511         if (!dev->wideTnodesDisabled) {
7512                 /* bits must be even so that we end up with 32-bit words */
7513                 if (bits & 1)
7514                         bits++;
7515                 if (bits < 16)
7516                         dev->tnodeWidth = 16;
7517                 else
7518                         dev->tnodeWidth = bits;
7519         } else
7520                 dev->tnodeWidth = 16;
7521
7522         dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7523
7524         /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7525          * so if the bitwidth of the
7526          * chunk range we're using is greater than 16 we need
7527          * to figure out chunk shift and chunkGroupSize
7528          */
7529
7530         if (bits <= dev->tnodeWidth)
7531                 dev->chunkGroupBits = 0;
7532         else
7533                 dev->chunkGroupBits = bits - dev->tnodeWidth;
7534
7535
7536         dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7537
7538         if (dev->nChunksPerBlock < dev->chunkGroupSize) {
7539                 /* We have a problem because the soft delete won't work if
7540                  * the chunk group size > chunks per block.
7541                  * This can be remedied by using larger "virtual blocks".
7542                  */
7543                 T(YAFFS_TRACE_ALWAYS,
7544                   (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7545
7546                 return YAFFS_FAIL;
7547         }
7548
7549         /* OK, we've finished verifying the device, lets continue with initialisation */
7550
7551         /* More device initialisation */
7552         dev->garbageCollections = 0;
7553         dev->passiveGarbageCollections = 0;
7554         dev->currentDirtyChecker = 0;
7555         dev->bufferedBlock = -1;
7556         dev->doingBufferedBlockRewrite = 0;
7557         dev->nDeletedFiles = 0;
7558         dev->nBackgroundDeletions = 0;
7559         dev->nUnlinkedFiles = 0;
7560         dev->eccFixed = 0;
7561         dev->eccUnfixed = 0;
7562         dev->tagsEccFixed = 0;
7563         dev->tagsEccUnfixed = 0;
7564         dev->nErasureFailures = 0;
7565         dev->nErasedBlocks = 0;
7566         dev->isDoingGC = 0;
7567         dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7568
7569         /* Initialise temporary buffers and caches. */
7570         if (!yaffs_InitialiseTempBuffers(dev))
7571                 init_failed = 1;
7572
7573         dev->srCache = NULL;
7574         dev->gcCleanupList = NULL;
7575
7576
7577         if (!init_failed &&
7578             dev->nShortOpCaches > 0) {
7579                 int i;
7580                 void *buf;
7581                 int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
7582
7583                 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
7584                         dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7585
7586                 dev->srCache =  YMALLOC(srCacheBytes);
7587
7588                 buf = (__u8 *) dev->srCache;
7589
7590                 if (dev->srCache)
7591                         memset(dev->srCache, 0, srCacheBytes);
7592
7593                 for (i = 0; i < dev->nShortOpCaches && buf; i++) {
7594                         dev->srCache[i].object = NULL;
7595                         dev->srCache[i].lastUse = 0;
7596                         dev->srCache[i].dirty = 0;
7597                         dev->srCache[i].data = buf = YMALLOC_DMA(dev->totalBytesPerChunk);
7598                 }
7599                 if (!buf)
7600                         init_failed = 1;
7601
7602                 dev->srLastUse = 0;
7603         }
7604
7605         dev->cacheHits = 0;
7606
7607         if (!init_failed) {
7608                 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
7609                 if (!dev->gcCleanupList)
7610                         init_failed = 1;
7611         }
7612
7613         if (dev->isYaffs2)
7614                 dev->useHeaderFileSize = 1;
7615
7616         if (!init_failed && !yaffs_InitialiseBlocks(dev))
7617                 init_failed = 1;
7618
7619         yaffs_InitialiseTnodes(dev);
7620         yaffs_InitialiseObjects(dev);
7621
7622         if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7623                 init_failed = 1;
7624
7625
7626         if (!init_failed) {
7627                 /* Now scan the flash. */
7628                 if (dev->isYaffs2) {
7629                         if (yaffs_CheckpointRestore(dev)) {
7630                                 yaffs_CheckObjectDetailsLoaded(dev->rootDir);
7631                                 T(YAFFS_TRACE_ALWAYS,
7632                                   (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7633                         } else {
7634
7635                                 /* Clean up the mess caused by an aborted checkpoint load
7636                                  * and scan backwards.
7637                                  */
7638                                 yaffs_DeinitialiseBlocks(dev);
7639                                 yaffs_DeinitialiseTnodes(dev);
7640                                 yaffs_DeinitialiseObjects(dev);
7641
7642
7643                                 dev->nErasedBlocks = 0;
7644                                 dev->nFreeChunks = 0;
7645                                 dev->allocationBlock = -1;
7646                                 dev->allocationPage = -1;
7647                                 dev->nDeletedFiles = 0;
7648                                 dev->nUnlinkedFiles = 0;
7649                                 dev->nBackgroundDeletions = 0;
7650                                 dev->oldestDirtySequence = 0;
7651
7652                                 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7653                                         init_failed = 1;
7654
7655                                 yaffs_InitialiseTnodes(dev);
7656                                 yaffs_InitialiseObjects(dev);
7657
7658                                 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7659                                         init_failed = 1;
7660
7661                                 if (!init_failed && !yaffs_ScanBackwards(dev))
7662                                         init_failed = 1;
7663                         }
7664                 } else if (!yaffs_Scan(dev))
7665                                 init_failed = 1;
7666
7667                 yaffs_StripDeletedObjects(dev);
7668                 yaffs_FixHangingObjects(dev);
7669                 if(dev->emptyLostAndFound)
7670                         yaffs_EmptyLostAndFound(dev);
7671         }
7672
7673         if (init_failed) {
7674                 /* Clean up the mess */
7675                 T(YAFFS_TRACE_TRACING,
7676                   (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7677
7678                 yaffs_Deinitialise(dev);
7679                 return YAFFS_FAIL;
7680         }
7681
7682         /* Zero out stats */
7683         dev->nPageReads = 0;
7684         dev->nPageWrites = 0;
7685         dev->nBlockErasures = 0;
7686         dev->nGCCopies = 0;
7687         dev->nRetriedWrites = 0;
7688
7689         dev->nRetiredBlocks = 0;
7690
7691         yaffs_VerifyFreeChunks(dev);
7692         yaffs_VerifyBlocks(dev);
7693
7694         /* Clean up any aborted checkpoint data */
7695         if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
7696                 yaffs_InvalidateCheckpoint(dev);
7697
7698         T(YAFFS_TRACE_TRACING,
7699           (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7700         return YAFFS_OK;
7701
7702 }
7703
7704 void yaffs_Deinitialise(yaffs_Device *dev)
7705 {
7706         if (dev->isMounted) {
7707                 int i;
7708
7709                 yaffs_DeinitialiseBlocks(dev);
7710                 yaffs_DeinitialiseTnodes(dev);
7711                 yaffs_DeinitialiseObjects(dev);
7712                 if (dev->nShortOpCaches > 0 &&
7713                     dev->srCache) {
7714
7715                         for (i = 0; i < dev->nShortOpCaches; i++) {
7716                                 if (dev->srCache[i].data)
7717                                         YFREE(dev->srCache[i].data);
7718                                 dev->srCache[i].data = NULL;
7719                         }
7720
7721                         YFREE(dev->srCache);
7722                         dev->srCache = NULL;
7723                 }
7724
7725                 YFREE(dev->gcCleanupList);
7726
7727                 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
7728                         YFREE(dev->tempBuffer[i].buffer);
7729
7730                 dev->isMounted = 0;
7731
7732                 if (dev->deinitialiseNAND)
7733                         dev->deinitialiseNAND(dev);
7734         }
7735 }
7736
7737 static int yaffs_CountFreeChunks(yaffs_Device *dev)
7738 {
7739         int nFree;
7740         int b;
7741
7742         yaffs_BlockInfo *blk;
7743
7744         for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7745                         b++) {
7746                 blk = yaffs_GetBlockInfo(dev, b);
7747
7748                 switch (blk->blockState) {
7749                 case YAFFS_BLOCK_STATE_EMPTY:
7750                 case YAFFS_BLOCK_STATE_ALLOCATING:
7751                 case YAFFS_BLOCK_STATE_COLLECTING:
7752                 case YAFFS_BLOCK_STATE_FULL:
7753                         nFree +=
7754                             (dev->nChunksPerBlock - blk->pagesInUse +
7755                              blk->softDeletions);
7756                         break;
7757                 default:
7758                         break;
7759                 }
7760         }
7761
7762         return nFree;
7763 }
7764
7765 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
7766 {
7767         /* This is what we report to the outside world */
7768
7769         int nFree;
7770         int nDirtyCacheChunks;
7771         int blocksForCheckpoint;
7772         int i;
7773
7774 #if 1
7775         nFree = dev->nFreeChunks;
7776 #else
7777         nFree = yaffs_CountFreeChunks(dev);
7778 #endif
7779
7780         nFree += dev->nDeletedFiles;
7781
7782         /* Now count the number of dirty chunks in the cache and subtract those */
7783
7784         for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
7785                 if (dev->srCache[i].dirty)
7786                         nDirtyCacheChunks++;
7787         }
7788
7789         nFree -= nDirtyCacheChunks;
7790
7791         nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
7792
7793         /* Now we figure out how much to reserve for the checkpoint and report that... */
7794         blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
7795         if (blocksForCheckpoint < 0)
7796                 blocksForCheckpoint = 0;
7797
7798         nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
7799
7800         if (nFree < 0)
7801                 nFree = 0;
7802
7803         return nFree;
7804
7805 }
7806
7807 static int yaffs_freeVerificationFailures;
7808
7809 static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
7810 {
7811         int counted;
7812         int difference;
7813
7814         if (yaffs_SkipVerification(dev))
7815                 return;
7816
7817         counted = yaffs_CountFreeChunks(dev);
7818
7819         difference = dev->nFreeChunks - counted;
7820
7821         if (difference) {
7822                 T(YAFFS_TRACE_ALWAYS,
7823                   (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7824                    dev->nFreeChunks, counted, difference));
7825                 yaffs_freeVerificationFailures++;
7826         }
7827 }
7828
7829 /*---------------------------------------- YAFFS test code ----------------------*/
7830
7831 #define yaffs_CheckStruct(structure, syze, name) \
7832         do { \
7833                 if (sizeof(structure) != syze) { \
7834                         T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
7835                                 name, syze, (int) sizeof(structure))); \
7836                         return YAFFS_FAIL; \
7837                 } \
7838         } while (0)
7839
7840 static int yaffs_CheckStructures(void)
7841 {
7842 /*      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
7843 /*      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
7844 /*      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
7845 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7846 /*      yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode"); */
7847 #endif
7848 #ifndef CONFIG_YAFFS_WINCE
7849         yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");
7850 #endif
7851         return YAFFS_OK;
7852 }