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 1.107 2010-02-17 02:01:25 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 static Y_INLINE int yaffs_CalcTnodeSize(yaffs_Device *dev)
1193 {
1194         int tnodeSize;
1195         /* Calculate the tnode size in bytes for variable width tnode support.
1196          * Must be a multiple of 32-bits  */
1197         tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1198
1199         if (tnodeSize < sizeof(yaffs_Tnode))
1200                 tnodeSize = sizeof(yaffs_Tnode);
1201         return tnodeSize;
1202 }
1203
1204 static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
1205 {
1206         int i;
1207         int tnodeSize = yaffs_CalcTnodeSize(dev);
1208         yaffs_Tnode *newTnodes;
1209         __u8 *mem;
1210         yaffs_Tnode *curr;
1211         yaffs_Tnode *next;
1212         yaffs_TnodeList *tnl;
1213
1214         if (nTnodes < 1)
1215                 return YAFFS_OK;
1216
1217
1218         /* make these things */
1219
1220         newTnodes = YMALLOC(nTnodes * tnodeSize);
1221         mem = (__u8 *)newTnodes;
1222
1223         if (!newTnodes) {
1224                 T(YAFFS_TRACE_ERROR,
1225                         (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1226                 return YAFFS_FAIL;
1227         }
1228
1229         /* Hook them into the free list */
1230 #if 0
1231         for (i = 0; i < nTnodes - 1; i++) {
1232                 newTnodes[i].internal[0] = &newTnodes[i + 1];
1233 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1234                 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1235 #endif
1236         }
1237
1238         newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1239 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1240         newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1241 #endif
1242         dev->freeTnodes = newTnodes;
1243 #else
1244         /* New hookup for wide tnodes */
1245         for (i = 0; i < nTnodes - 1; i++) {
1246                 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1247                 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1248                 curr->internal[0] = next;
1249         }
1250
1251         curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1252         curr->internal[0] = dev->freeTnodes;
1253         dev->freeTnodes = (yaffs_Tnode *)mem;
1254
1255 #endif
1256
1257
1258         dev->nFreeTnodes += nTnodes;
1259         dev->nTnodesCreated += nTnodes;
1260
1261         /* Now add this bunch of tnodes to a list for freeing up.
1262          * NB If we can't add this to the management list it isn't fatal
1263          * but it just means we can't free this bunch of tnodes later.
1264          */
1265
1266         tnl = YMALLOC(sizeof(yaffs_TnodeList));
1267         if (!tnl) {
1268                 T(YAFFS_TRACE_ERROR,
1269                   (TSTR
1270                    ("yaffs: Could not add tnodes to management list" TENDSTR)));
1271                    return YAFFS_FAIL;
1272         } else {
1273                 tnl->tnodes = newTnodes;
1274                 tnl->next = dev->allocatedTnodeList;
1275                 dev->allocatedTnodeList = tnl;
1276         }
1277
1278         T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1279
1280         return YAFFS_OK;
1281 }
1282
1283 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1284
1285 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device *dev)
1286 {
1287         yaffs_Tnode *tn = NULL;
1288
1289 #ifdef CONFIG_YAFFS_VALGRIND_TEST
1290         tn = YMALLOC(yaffs_CalcTnodeSize(dev));
1291         if(tn)
1292                 dev->nTnodesCreated++;
1293 #else
1294         /* If there are none left make more */
1295         if (!dev->freeTnodes)
1296                 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1297
1298         if (dev->freeTnodes) {
1299                 tn = dev->freeTnodes;
1300 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1301                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1302                         /* Hoosterman, this thing looks like it isn't in the list */
1303                         T(YAFFS_TRACE_ALWAYS,
1304                           (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1305                 }
1306 #endif
1307                 dev->freeTnodes = dev->freeTnodes->internal[0];
1308                 dev->nFreeTnodes--;
1309         }
1310 #endif
1311         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1312
1313         return tn;
1314 }
1315
1316 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
1317 {
1318         yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1319         int tnodeSize = yaffs_CalcTnodeSize(dev);
1320
1321         if (tn)
1322                 memset(tn, 0, tnodeSize);
1323
1324         return tn;
1325 }
1326
1327 /* FreeTnode frees up a tnode and puts it back on the free list */
1328 static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
1329 {
1330         if (tn) {
1331 #ifdef CONFIG_YAFFS_VALGRIND_TEST
1332                 YFREE(tn);
1333                 dev->nTnodesCreated--;
1334 #else
1335 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1336                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1337                         /* Hoosterman, this thing looks like it is already in the list */
1338                         T(YAFFS_TRACE_ALWAYS,
1339                           (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1340                 }
1341                 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1342 #endif
1343                 tn->internal[0] = dev->freeTnodes;
1344                 dev->freeTnodes = tn;
1345                 dev->nFreeTnodes++;
1346 #endif
1347         }
1348         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1349 }
1350
1351 static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
1352 {
1353         /* Free the list of allocated tnodes */
1354         yaffs_TnodeList *tmp;
1355
1356         while (dev->allocatedTnodeList) {
1357                 tmp = dev->allocatedTnodeList->next;
1358
1359                 YFREE(dev->allocatedTnodeList->tnodes);
1360                 YFREE(dev->allocatedTnodeList);
1361                 dev->allocatedTnodeList = tmp;
1362
1363         }
1364
1365         dev->freeTnodes = NULL;
1366         dev->nFreeTnodes = 0;
1367         dev->nTnodesCreated = 0;
1368 }
1369
1370 static void yaffs_InitialiseTnodes(yaffs_Device *dev)
1371 {
1372         dev->allocatedTnodeList = NULL;
1373         dev->freeTnodes = NULL;
1374         dev->nFreeTnodes = 0;
1375         dev->nTnodesCreated = 0;
1376 }
1377
1378
1379 void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
1380                 unsigned val)
1381 {
1382         __u32 *map = (__u32 *)tn;
1383         __u32 bitInMap;
1384         __u32 bitInWord;
1385         __u32 wordInMap;
1386         __u32 mask;
1387
1388         pos &= YAFFS_TNODES_LEVEL0_MASK;
1389         val >>= dev->chunkGroupBits;
1390
1391         bitInMap = pos * dev->tnodeWidth;
1392         wordInMap = bitInMap / 32;
1393         bitInWord = bitInMap & (32 - 1);
1394
1395         mask = dev->tnodeMask << bitInWord;
1396
1397         map[wordInMap] &= ~mask;
1398         map[wordInMap] |= (mask & (val << bitInWord));
1399
1400         if (dev->tnodeWidth > (32 - bitInWord)) {
1401                 bitInWord = (32 - bitInWord);
1402                 wordInMap++;;
1403                 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1404                 map[wordInMap] &= ~mask;
1405                 map[wordInMap] |= (mask & (val >> bitInWord));
1406         }
1407 }
1408
1409 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
1410                 unsigned pos)
1411 {
1412         __u32 *map = (__u32 *)tn;
1413         __u32 bitInMap;
1414         __u32 bitInWord;
1415         __u32 wordInMap;
1416         __u32 val;
1417
1418         pos &= YAFFS_TNODES_LEVEL0_MASK;
1419
1420         bitInMap = pos * dev->tnodeWidth;
1421         wordInMap = bitInMap / 32;
1422         bitInWord = bitInMap & (32 - 1);
1423
1424         val = map[wordInMap] >> bitInWord;
1425
1426         if      (dev->tnodeWidth > (32 - bitInWord)) {
1427                 bitInWord = (32 - bitInWord);
1428                 wordInMap++;;
1429                 val |= (map[wordInMap] << bitInWord);
1430         }
1431
1432         val &= dev->tnodeMask;
1433         val <<= dev->chunkGroupBits;
1434
1435         return val;
1436 }
1437
1438 /* ------------------- End of individual tnode manipulation -----------------*/
1439
1440 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1441  * The look up tree is represented by the top tnode and the number of topLevel
1442  * in the tree. 0 means only the level 0 tnode is in the tree.
1443  */
1444
1445 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1446 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
1447                                         yaffs_FileStructure *fStruct,
1448                                         __u32 chunkId)
1449 {
1450         yaffs_Tnode *tn = fStruct->top;
1451         __u32 i;
1452         int requiredTallness;
1453         int level = fStruct->topLevel;
1454
1455         /* Check sane level and chunk Id */
1456         if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
1457                 return NULL;
1458
1459         if (chunkId > YAFFS_MAX_CHUNK_ID)
1460                 return NULL;
1461
1462         /* First check we're tall enough (ie enough topLevel) */
1463
1464         i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1465         requiredTallness = 0;
1466         while (i) {
1467                 i >>= YAFFS_TNODES_INTERNAL_BITS;
1468                 requiredTallness++;
1469         }
1470
1471         if (requiredTallness > fStruct->topLevel)
1472                 return NULL; /* Not tall enough, so we can't find it */
1473
1474         /* Traverse down to level 0 */
1475         while (level > 0 && tn) {
1476                 tn = tn->internal[(chunkId >>
1477                         (YAFFS_TNODES_LEVEL0_BITS +
1478                                 (level - 1) *
1479                                 YAFFS_TNODES_INTERNAL_BITS)) &
1480                         YAFFS_TNODES_INTERNAL_MASK];
1481                 level--;
1482         }
1483
1484         return tn;
1485 }
1486
1487 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1488  * This happens in two steps:
1489  *  1. If the tree isn't tall enough, then make it taller.
1490  *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1491  *
1492  * Used when modifying the tree.
1493  *
1494  *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1495  *  be plugged into the ttree.
1496  */
1497
1498 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
1499                                         yaffs_FileStructure *fStruct,
1500                                         __u32 chunkId,
1501                                         yaffs_Tnode *passedTn)
1502 {
1503         int requiredTallness;
1504         int i;
1505         int l;
1506         yaffs_Tnode *tn;
1507
1508         __u32 x;
1509
1510
1511         /* Check sane level and page Id */
1512         if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
1513                 return NULL;
1514
1515         if (chunkId > YAFFS_MAX_CHUNK_ID)
1516                 return NULL;
1517
1518         /* First check we're tall enough (ie enough topLevel) */
1519
1520         x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1521         requiredTallness = 0;
1522         while (x) {
1523                 x >>= YAFFS_TNODES_INTERNAL_BITS;
1524                 requiredTallness++;
1525         }
1526
1527
1528         if (requiredTallness > fStruct->topLevel) {
1529                 /* Not tall enough, gotta make the tree taller */
1530                 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1531
1532                         tn = yaffs_GetTnode(dev);
1533
1534                         if (tn) {
1535                                 tn->internal[0] = fStruct->top;
1536                                 fStruct->top = tn;
1537                                 fStruct->topLevel++;
1538                         } else {
1539                                 T(YAFFS_TRACE_ERROR,
1540                                         (TSTR("yaffs: no more tnodes" TENDSTR)));
1541                                 return NULL;
1542                         }
1543                 }
1544         }
1545
1546         /* Traverse down to level 0, adding anything we need */
1547
1548         l = fStruct->topLevel;
1549         tn = fStruct->top;
1550
1551         if (l > 0) {
1552                 while (l > 0 && tn) {
1553                         x = (chunkId >>
1554                              (YAFFS_TNODES_LEVEL0_BITS +
1555                               (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1556                             YAFFS_TNODES_INTERNAL_MASK;
1557
1558
1559                         if ((l > 1) && !tn->internal[x]) {
1560                                 /* Add missing non-level-zero tnode */
1561                                 tn->internal[x] = yaffs_GetTnode(dev);
1562                                 if(!tn->internal[x])
1563                                         return NULL;
1564                         } else if (l == 1) {
1565                                 /* Looking from level 1 at level 0 */
1566                                 if (passedTn) {
1567                                         /* If we already have one, then release it.*/
1568                                         if (tn->internal[x])
1569                                                 yaffs_FreeTnode(dev, tn->internal[x]);
1570                                         tn->internal[x] = passedTn;
1571
1572                                 } else if (!tn->internal[x]) {
1573                                         /* Don't have one, none passed in */
1574                                         tn->internal[x] = yaffs_GetTnode(dev);
1575                                         if(!tn->internal[x])
1576                                                 return NULL;
1577                                 }
1578                         }
1579
1580                         tn = tn->internal[x];
1581                         l--;
1582                 }
1583         } else {
1584                 /* top is level 0 */
1585                 if (passedTn) {
1586                         memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1587                         yaffs_FreeTnode(dev, passedTn);
1588                 }
1589         }
1590
1591         return tn;
1592 }
1593
1594 static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
1595                                 yaffs_ExtendedTags *tags, int objectId,
1596                                 int chunkInInode)
1597 {
1598         int j;
1599
1600         for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1601                 if (yaffs_CheckChunkBit(dev, theChunk / dev->nChunksPerBlock,
1602                                 theChunk % dev->nChunksPerBlock)) {
1603
1604                         if(dev->chunkGroupSize == 1)
1605                                 return theChunk;
1606                         else {
1607                                 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1608                                                                 tags);
1609                                 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1610                                         /* found it; */
1611                                         return theChunk;
1612                                 }
1613                         }
1614                 }
1615                 theChunk++;
1616         }
1617         return -1;
1618 }
1619
1620
1621 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1622  * chunks and tnodes in the file
1623  * Returns 1 if the tree was deleted.
1624  * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1625  */
1626
1627 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
1628                               int chunkOffset, int *limit)
1629 {
1630         int i;
1631         int chunkInInode;
1632         int theChunk;
1633         yaffs_ExtendedTags tags;
1634         int foundChunk;
1635         yaffs_Device *dev = in->myDev;
1636
1637         int allDone = 1;
1638
1639         if (tn) {
1640                 if (level > 0) {
1641                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1642                              i--) {
1643                                 if (tn->internal[i]) {
1644                                         if (limit && (*limit) < 0) {
1645                                                 allDone = 0;
1646                                         } else {
1647                                                 allDone =
1648                                                         yaffs_DeleteWorker(in,
1649                                                                 tn->
1650                                                                 internal
1651                                                                 [i],
1652                                                                 level -
1653                                                                 1,
1654                                                                 (chunkOffset
1655                                                                         <<
1656                                                                         YAFFS_TNODES_INTERNAL_BITS)
1657                                                                 + i,
1658                                                                 limit);
1659                                         }
1660                                         if (allDone) {
1661                                                 yaffs_FreeTnode(dev,
1662                                                                 tn->
1663                                                                 internal[i]);
1664                                                 tn->internal[i] = NULL;
1665                                         }
1666                                 }
1667                         }
1668                         return (allDone) ? 1 : 0;
1669                 } else if (level == 0) {
1670                         int hitLimit = 0;
1671
1672                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1673                                         i--) {
1674                                 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1675                                 if (theChunk) {
1676
1677                                         chunkInInode = (chunkOffset <<
1678                                                 YAFFS_TNODES_LEVEL0_BITS) + i;
1679
1680                                         foundChunk =
1681                                                 yaffs_FindChunkInGroup(dev,
1682                                                                 theChunk,
1683                                                                 &tags,
1684                                                                 in->objectId,
1685                                                                 chunkInInode);
1686
1687                                         if (foundChunk > 0) {
1688                                                 yaffs_DeleteChunk(dev,
1689                                                                   foundChunk, 1,
1690                                                                   __LINE__);
1691                                                 in->nDataChunks--;
1692                                                 if (limit) {
1693                                                         *limit = *limit - 1;
1694                                                         if (*limit <= 0)
1695                                                                 hitLimit = 1;
1696                                                 }
1697
1698                                         }
1699
1700                                         yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1701                                 }
1702
1703                         }
1704                         return (i < 0) ? 1 : 0;
1705
1706                 }
1707
1708         }
1709
1710         return 1;
1711
1712 }
1713
1714 static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
1715 {
1716         yaffs_BlockInfo *theBlock;
1717
1718         T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1719
1720         theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1721         if (theBlock) {
1722                 theBlock->softDeletions++;
1723                 dev->nFreeChunks++;
1724         }
1725 }
1726
1727 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1728  * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1729  * of the tnode.
1730  * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1731  */
1732
1733 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
1734                                   __u32 level, int chunkOffset)
1735 {
1736         int i;
1737         int theChunk;
1738         int allDone = 1;
1739         yaffs_Device *dev = in->myDev;
1740
1741         if (tn) {
1742                 if (level > 0) {
1743
1744                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1745                              i--) {
1746                                 if (tn->internal[i]) {
1747                                         allDone =
1748                                             yaffs_SoftDeleteWorker(in,
1749                                                                    tn->
1750                                                                    internal[i],
1751                                                                    level - 1,
1752                                                                    (chunkOffset
1753                                                                     <<
1754                                                                     YAFFS_TNODES_INTERNAL_BITS)
1755                                                                    + i);
1756                                         if (allDone) {
1757                                                 yaffs_FreeTnode(dev,
1758                                                                 tn->
1759                                                                 internal[i]);
1760                                                 tn->internal[i] = NULL;
1761                                         } else {
1762                                                 /* Hoosterman... how could this happen? */
1763                                         }
1764                                 }
1765                         }
1766                         return (allDone) ? 1 : 0;
1767                 } else if (level == 0) {
1768
1769                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1770                                 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1771                                 if (theChunk) {
1772                                         /* Note this does not find the real chunk, only the chunk group.
1773                                          * We make an assumption that a chunk group is not larger than
1774                                          * a block.
1775                                          */
1776                                         yaffs_SoftDeleteChunk(dev, theChunk);
1777                                         yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1778                                 }
1779
1780                         }
1781                         return 1;
1782
1783                 }
1784
1785         }
1786
1787         return 1;
1788
1789 }
1790
1791 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1792 {
1793         if (obj->deleted &&
1794             obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1795                 if (obj->nDataChunks <= 0) {
1796                         /* Empty file with no duplicate object headers, just delete it immediately */
1797                         yaffs_FreeTnode(obj->myDev,
1798                                         obj->variant.fileVariant.top);
1799                         obj->variant.fileVariant.top = NULL;
1800                         T(YAFFS_TRACE_TRACING,
1801                           (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1802                            obj->objectId));
1803                         yaffs_DoGenericObjectDeletion(obj);
1804                 } else {
1805                         yaffs_SoftDeleteWorker(obj,
1806                                                obj->variant.fileVariant.top,
1807                                                obj->variant.fileVariant.
1808                                                topLevel, 0);
1809                         obj->softDeleted = 1;
1810                 }
1811         }
1812 }
1813
1814 /* Pruning removes any part of the file structure tree that is beyond the
1815  * bounds of the file (ie that does not point to chunks).
1816  *
1817  * A file should only get pruned when its size is reduced.
1818  *
1819  * Before pruning, the chunks must be pulled from the tree and the
1820  * level 0 tnode entries must be zeroed out.
1821  * Could also use this for file deletion, but that's probably better handled
1822  * by a special case.
1823  *
1824  * This function is recursive. For levels > 0 the function is called again on
1825  * any sub-tree. For level == 0 we just check if the sub-tree has data.
1826  * If there is no data in a subtree then it is pruned.
1827  */
1828
1829 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
1830                                 __u32 level, int del0)
1831 {
1832         int i;
1833         int hasData;
1834
1835         if (tn) {
1836                 hasData = 0;
1837
1838                 if(level > 0){
1839                         for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1840                                 if (tn->internal[i]) {
1841                                         tn->internal[i] =
1842                                                 yaffs_PruneWorker(dev, tn->internal[i],
1843                                                         level - 1,
1844                                                         (i == 0) ? del0 : 1);
1845                                 }
1846
1847                                 if (tn->internal[i])
1848                                         hasData++;
1849                         }
1850                 } else {
1851                         int tnodeSize_u32 = yaffs_CalcTnodeSize(dev)/sizeof(__u32);
1852                         __u32 *map = (__u32 *)tn;
1853
1854                         for(i = 0; !hasData && i < tnodeSize_u32; i++){
1855                                 if(map[i])
1856                                         hasData++;
1857                         }
1858                 }
1859
1860                 if (hasData == 0 && del0) {
1861                         /* Free and return NULL */
1862
1863                         yaffs_FreeTnode(dev, tn);
1864                         tn = NULL;
1865                 }
1866
1867         }
1868
1869         return tn;
1870
1871 }
1872
1873 static int yaffs_PruneFileStructure(yaffs_Device *dev,
1874                                 yaffs_FileStructure *fStruct)
1875 {
1876         int i;
1877         int hasData;
1878         int done = 0;
1879         yaffs_Tnode *tn;
1880
1881         if (fStruct->topLevel > 0) {
1882                 fStruct->top =
1883                     yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1884
1885                 /* Now we have a tree with all the non-zero branches NULL but the height
1886                  * is the same as it was.
1887                  * Let's see if we can trim internal tnodes to shorten the tree.
1888                  * We can do this if only the 0th element in the tnode is in use
1889                  * (ie all the non-zero are NULL)
1890                  */
1891
1892                 while (fStruct->topLevel && !done) {
1893                         tn = fStruct->top;
1894
1895                         hasData = 0;
1896                         for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1897                                 if (tn->internal[i])
1898                                         hasData++;
1899                         }
1900
1901                         if (!hasData) {
1902                                 fStruct->top = tn->internal[0];
1903                                 fStruct->topLevel--;
1904                                 yaffs_FreeTnode(dev, tn);
1905                         } else {
1906                                 done = 1;
1907                         }
1908                 }
1909         }
1910
1911         return YAFFS_OK;
1912 }
1913
1914 /*-------------------- End of File Structure functions.-------------------*/
1915
1916 /* yaffs_CreateFreeObjects creates a bunch more objects and
1917  * adds them to the object free list.
1918  */
1919 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
1920 {
1921         int i;
1922         yaffs_Object *newObjects;
1923         yaffs_ObjectList *list;
1924
1925         if (nObjects < 1)
1926                 return YAFFS_OK;
1927
1928         /* make these things */
1929         newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1930         list = YMALLOC(sizeof(yaffs_ObjectList));
1931
1932         if (!newObjects || !list) {
1933                 if (newObjects){
1934                         YFREE(newObjects);
1935                         newObjects = NULL;
1936                 }
1937                 if (list){
1938                         YFREE(list);
1939                         list = NULL;
1940                 }
1941                 T(YAFFS_TRACE_ALLOCATE,
1942                   (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1943                 return YAFFS_FAIL;
1944         }
1945
1946         /* Hook them into the free list */
1947         for (i = 0; i < nObjects - 1; i++) {
1948                 newObjects[i].siblings.next =
1949                                 (struct ylist_head *)(&newObjects[i + 1]);
1950         }
1951
1952         newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1953         dev->freeObjects = newObjects;
1954         dev->nFreeObjects += nObjects;
1955         dev->nObjectsCreated += nObjects;
1956
1957         /* Now add this bunch of Objects to a list for freeing up. */
1958
1959         list->objects = newObjects;
1960         list->next = dev->allocatedObjectList;
1961         dev->allocatedObjectList = list;
1962
1963         return YAFFS_OK;
1964 }
1965
1966
1967 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1968 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
1969 {
1970         yaffs_Object *tn = NULL;
1971
1972 #ifdef CONFIG_YAFFS_VALGRIND_TEST
1973         tn = YMALLOC(sizeof(yaffs_Object));
1974         if(tn)
1975                 dev->nObjectsCreated++;
1976 #else
1977         /* If there are none left make more */
1978         if (!dev->freeObjects)
1979                 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1980
1981         if (dev->freeObjects) {
1982                 tn = dev->freeObjects;
1983                 dev->freeObjects =
1984                         (yaffs_Object *) (dev->freeObjects->siblings.next);
1985                 dev->nFreeObjects--;
1986         }
1987 #endif
1988         if (tn) {
1989                 /* Now sweeten it up... */
1990
1991                 memset(tn, 0, sizeof(yaffs_Object));
1992                 tn->beingCreated = 1;
1993
1994                 tn->myDev = dev;
1995                 tn->hdrChunk = 0;
1996                 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1997                 YINIT_LIST_HEAD(&(tn->hardLinks));
1998                 YINIT_LIST_HEAD(&(tn->hashLink));
1999                 YINIT_LIST_HEAD(&tn->siblings);
2000
2001
2002                 /* Now make the directory sane */
2003                 if (dev->rootDir) {
2004                         tn->parent = dev->rootDir;
2005                         ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
2006                 }
2007
2008                 /* Add it to the lost and found directory.
2009                  * NB Can't put root or lostNFound in lostNFound so
2010                  * check if lostNFound exists first
2011                  */
2012                 if (dev->lostNFoundDir)
2013                         yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
2014
2015                 tn->beingCreated = 0;
2016         }
2017
2018         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2019
2020         return tn;
2021 }
2022
2023 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
2024                                                __u32 mode)
2025 {
2026
2027         yaffs_Object *obj =
2028             yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
2029         if (obj) {
2030                 obj->fake = 1;          /* it is fake so it might have no NAND presence... */
2031                 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
2032                 obj->unlinkAllowed = 0; /* ... or unlink it */
2033                 obj->deleted = 0;
2034                 obj->unlinked = 0;
2035                 obj->yst_mode = mode;
2036                 obj->myDev = dev;
2037                 obj->hdrChunk = 0;      /* Not a valid chunk. */
2038         }
2039
2040         return obj;
2041
2042 }
2043
2044 static void yaffs_UnhashObject(yaffs_Object *tn)
2045 {
2046         int bucket;
2047         yaffs_Device *dev = tn->myDev;
2048
2049         /* If it is still linked into the bucket list, free from the list */
2050         if (!ylist_empty(&tn->hashLink)) {
2051                 ylist_del_init(&tn->hashLink);
2052                 bucket = yaffs_HashFunction(tn->objectId);
2053                 dev->objectBucket[bucket].count--;
2054         }
2055 }
2056
2057 /*  FreeObject frees up a Object and puts it back on the free list */
2058 static void yaffs_FreeObject(yaffs_Object *tn)
2059 {
2060         yaffs_Device *dev = tn->myDev;
2061
2062         T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
2063
2064         if (!tn)
2065                 YBUG();
2066         if (tn->parent)
2067                 YBUG();
2068         if (!ylist_empty(&tn->siblings))
2069                 YBUG();
2070
2071
2072         if (tn->myInode) {
2073                 /* We're still hooked up to a cached inode.
2074                  * Don't delete now, but mark for later deletion
2075                  */
2076                 tn->deferedFree = 1;
2077                 return;
2078         }
2079
2080         yaffs_UnhashObject(tn);
2081
2082 #ifdef CONFIG_YAFFS_VALGRIND_TEST
2083         YFREE(tn);
2084         dev->nObjectsCreated--;
2085         tn = NULL;
2086 #else
2087         /* Link into the free list. */
2088         tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
2089         dev->freeObjects = tn;
2090         dev->nFreeObjects++;
2091 #endif
2092         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2093 }
2094
2095 #ifdef __KERNEL__
2096
2097 void yaffs_HandleDeferedFree(yaffs_Object *obj)
2098 {
2099         if (obj->deferedFree)
2100                 yaffs_FreeObject(obj);
2101 }
2102
2103 #endif
2104
2105 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
2106 {
2107         /* Free the list of allocated Objects */
2108
2109         yaffs_ObjectList *tmp;
2110
2111         while (dev->allocatedObjectList) {
2112                 tmp = dev->allocatedObjectList->next;
2113                 YFREE(dev->allocatedObjectList->objects);
2114                 YFREE(dev->allocatedObjectList);
2115
2116                 dev->allocatedObjectList = tmp;
2117         }
2118
2119         dev->freeObjects = NULL;
2120         dev->nFreeObjects = 0;
2121         dev->nObjectsCreated = 0;
2122 }
2123
2124 static void yaffs_InitialiseObjects(yaffs_Device *dev)
2125 {
2126         int i;
2127
2128         dev->allocatedObjectList = NULL;
2129         dev->freeObjects = NULL;
2130         dev->nFreeObjects = 0;
2131
2132         for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2133                 YINIT_LIST_HEAD(&dev->objectBucket[i].list);
2134                 dev->objectBucket[i].count = 0;
2135         }
2136 }
2137
2138 static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
2139 {
2140         static int x;
2141         int i;
2142         int l = 999;
2143         int lowest = 999999;
2144
2145         /* First let's see if we can find one that's empty. */
2146
2147         for (i = 0; i < 10 && lowest > 0; i++) {
2148                 x++;
2149                 x %= YAFFS_NOBJECT_BUCKETS;
2150                 if (dev->objectBucket[x].count < lowest) {
2151                         lowest = dev->objectBucket[x].count;
2152                         l = x;
2153                 }
2154
2155         }
2156
2157         /* If we didn't find an empty list, then try
2158          * looking a bit further for a short one
2159          */
2160
2161         for (i = 0; i < 10 && lowest > 3; i++) {
2162                 x++;
2163                 x %= YAFFS_NOBJECT_BUCKETS;
2164                 if (dev->objectBucket[x].count < lowest) {
2165                         lowest = dev->objectBucket[x].count;
2166                         l = x;
2167                 }
2168
2169         }
2170
2171         return l;
2172 }
2173
2174 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
2175 {
2176         int bucket = yaffs_FindNiceObjectBucket(dev);
2177
2178         /* Now find an object value that has not already been taken
2179          * by scanning the list.
2180          */
2181
2182         int found = 0;
2183         struct ylist_head *i;
2184
2185         __u32 n = (__u32) bucket;
2186
2187         /* yaffs_CheckObjectHashSanity();  */
2188
2189         while (!found) {
2190                 found = 1;
2191                 n += YAFFS_NOBJECT_BUCKETS;
2192                 if (1 || dev->objectBucket[bucket].count > 0) {
2193                         ylist_for_each(i, &dev->objectBucket[bucket].list) {
2194                                 /* If there is already one in the list */
2195                                 if (i && ylist_entry(i, yaffs_Object,
2196                                                 hashLink)->objectId == n) {
2197                                         found = 0;
2198                                 }
2199                         }
2200                 }
2201         }
2202
2203         return n;
2204 }
2205
2206 static void yaffs_HashObject(yaffs_Object *in)
2207 {
2208         int bucket = yaffs_HashFunction(in->objectId);
2209         yaffs_Device *dev = in->myDev;
2210
2211         ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
2212         dev->objectBucket[bucket].count++;
2213 }
2214
2215 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
2216 {
2217         int bucket = yaffs_HashFunction(number);
2218         struct ylist_head *i;
2219         yaffs_Object *in;
2220
2221         ylist_for_each(i, &dev->objectBucket[bucket].list) {
2222                 /* Look if it is in the list */
2223                 if (i) {
2224                         in = ylist_entry(i, yaffs_Object, hashLink);
2225                         if (in->objectId == number) {
2226 #ifdef __KERNEL__
2227                                 /* Don't tell the VFS about this one if it is defered free */
2228                                 if (in->deferedFree)
2229                                         return NULL;
2230 #endif
2231
2232                                 return in;
2233                         }
2234                 }
2235         }
2236
2237         return NULL;
2238 }
2239
2240 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
2241                                     yaffs_ObjectType type)
2242 {
2243         yaffs_Object *theObject=NULL;
2244         yaffs_Tnode *tn = NULL;
2245
2246         if (number < 0)
2247                 number = yaffs_CreateNewObjectNumber(dev);
2248
2249         if (type == YAFFS_OBJECT_TYPE_FILE) {
2250                 tn = yaffs_GetTnode(dev);
2251                 if (!tn)
2252                         return NULL;
2253         }
2254
2255         theObject = yaffs_AllocateEmptyObject(dev);
2256         if (!theObject){
2257                 if(tn)
2258                         yaffs_FreeTnode(dev,tn);
2259                 return NULL;
2260         }
2261
2262
2263         if (theObject) {
2264                 theObject->fake = 0;
2265                 theObject->renameAllowed = 1;
2266                 theObject->unlinkAllowed = 1;
2267                 theObject->objectId = number;
2268                 yaffs_HashObject(theObject);
2269                 theObject->variantType = type;
2270 #ifdef CONFIG_YAFFS_WINCE
2271                 yfsd_WinFileTimeNow(theObject->win_atime);
2272                 theObject->win_ctime[0] = theObject->win_mtime[0] =
2273                     theObject->win_atime[0];
2274                 theObject->win_ctime[1] = theObject->win_mtime[1] =
2275                     theObject->win_atime[1];
2276
2277 #else
2278
2279                 theObject->yst_atime = theObject->yst_mtime =
2280                     theObject->yst_ctime = Y_CURRENT_TIME;
2281 #endif
2282                 switch (type) {
2283                 case YAFFS_OBJECT_TYPE_FILE:
2284                         theObject->variant.fileVariant.fileSize = 0;
2285                         theObject->variant.fileVariant.scannedFileSize = 0;
2286                         theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2287                         theObject->variant.fileVariant.topLevel = 0;
2288                         theObject->variant.fileVariant.top = tn;
2289                         break;
2290                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2291                         YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2292                                         children);
2293                         break;
2294                 case YAFFS_OBJECT_TYPE_SYMLINK:
2295                 case YAFFS_OBJECT_TYPE_HARDLINK:
2296                 case YAFFS_OBJECT_TYPE_SPECIAL:
2297                         /* No action required */
2298                         break;
2299                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2300                         /* todo this should not happen */
2301                         break;
2302                 }
2303         }
2304
2305         return theObject;
2306 }
2307
2308 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
2309                                                       int number,
2310                                                       yaffs_ObjectType type)
2311 {
2312         yaffs_Object *theObject = NULL;
2313
2314         if (number > 0)
2315                 theObject = yaffs_FindObjectByNumber(dev, number);
2316
2317         if (!theObject)
2318                 theObject = yaffs_CreateNewObject(dev, number, type);
2319
2320         return theObject;
2321
2322 }
2323
2324
2325 static YCHAR *yaffs_CloneString(const YCHAR *str)
2326 {
2327         YCHAR *newStr = NULL;
2328         int len;
2329
2330         if (!str)
2331                 str = _Y("");
2332
2333         len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH);
2334         newStr = YMALLOC((len + 1) * sizeof(YCHAR));
2335         if (newStr){
2336                 yaffs_strncpy(newStr, str,len);
2337                 newStr[len] = 0;
2338         }
2339         return newStr;
2340
2341 }
2342
2343 /*
2344  * Mknod (create) a new object.
2345  * equivalentObject only has meaning for a hard link;
2346  * aliasString only has meaning for a symlink.
2347  * rdev only has meaning for devices (a subset of special objects)
2348  */
2349
2350 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2351                                        yaffs_Object *parent,
2352                                        const YCHAR *name,
2353                                        __u32 mode,
2354                                        __u32 uid,
2355                                        __u32 gid,
2356                                        yaffs_Object *equivalentObject,
2357                                        const YCHAR *aliasString, __u32 rdev)
2358 {
2359         yaffs_Object *in;
2360         YCHAR *str = NULL;
2361
2362         yaffs_Device *dev = parent->myDev;
2363
2364         /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2365         if (yaffs_FindObjectByName(parent, name))
2366                 return NULL;
2367
2368         if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2369                 str = yaffs_CloneString(aliasString);
2370                 if (!str)
2371                         return NULL;
2372         }
2373
2374         in = yaffs_CreateNewObject(dev, -1, type);
2375
2376         if (!in){
2377                 if(str)
2378                         YFREE(str);
2379                 return NULL;
2380         }
2381
2382
2383
2384
2385
2386         if (in) {
2387                 in->hdrChunk = 0;
2388                 in->valid = 1;
2389                 in->variantType = type;
2390
2391                 in->yst_mode = mode;
2392
2393 #ifdef CONFIG_YAFFS_WINCE
2394                 yfsd_WinFileTimeNow(in->win_atime);
2395                 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2396                 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2397
2398 #else
2399                 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2400
2401                 in->yst_rdev = rdev;
2402                 in->yst_uid = uid;
2403                 in->yst_gid = gid;
2404 #endif
2405                 in->nDataChunks = 0;
2406
2407                 yaffs_SetObjectName(in, name);
2408                 in->dirty = 1;
2409
2410                 yaffs_AddObjectToDirectory(parent, in);
2411
2412                 in->myDev = parent->myDev;
2413
2414                 switch (type) {
2415                 case YAFFS_OBJECT_TYPE_SYMLINK:
2416                         in->variant.symLinkVariant.alias = str;
2417                         break;
2418                 case YAFFS_OBJECT_TYPE_HARDLINK:
2419                         in->variant.hardLinkVariant.equivalentObject =
2420                                 equivalentObject;
2421                         in->variant.hardLinkVariant.equivalentObjectId =
2422                                 equivalentObject->objectId;
2423                         ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
2424                         break;
2425                 case YAFFS_OBJECT_TYPE_FILE:
2426                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2427                 case YAFFS_OBJECT_TYPE_SPECIAL:
2428                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2429                         /* do nothing */
2430                         break;
2431                 }
2432
2433                 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2434                         /* Could not create the object header, fail the creation */
2435                         yaffs_DeleteObject(in);
2436                         in = NULL;
2437                 }
2438
2439                 yaffs_UpdateParent(parent);
2440         }
2441
2442         return in;
2443 }
2444
2445 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
2446                         __u32 mode, __u32 uid, __u32 gid)
2447 {
2448         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2449                                 uid, gid, NULL, NULL, 0);
2450 }
2451
2452 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
2453                                 __u32 mode, __u32 uid, __u32 gid)
2454 {
2455         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2456                                  mode, uid, gid, NULL, NULL, 0);
2457 }
2458
2459 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
2460                                 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2461 {
2462         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2463                                  uid, gid, NULL, NULL, rdev);
2464 }
2465
2466 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
2467                                 __u32 mode, __u32 uid, __u32 gid,
2468                                 const YCHAR *alias)
2469 {
2470         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2471                                 uid, gid, NULL, alias, 0);
2472 }
2473
2474 /* yaffs_Link returns the object id of the equivalent object.*/
2475 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
2476                         yaffs_Object *equivalentObject)
2477 {
2478         /* Get the real object in case we were fed a hard link as an equivalent object */
2479         equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2480
2481         if (yaffs_MknodObject
2482             (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2483              equivalentObject, NULL, 0)) {
2484                 return equivalentObject;
2485         } else {
2486                 return NULL;
2487         }
2488
2489 }
2490
2491 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
2492                                 const YCHAR *newName, int force, int shadows)
2493 {
2494         int unlinkOp;
2495         int deleteOp;
2496
2497         yaffs_Object *existingTarget;
2498
2499         if (newDir == NULL)
2500                 newDir = obj->parent;   /* use the old directory */
2501
2502         if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2503                 T(YAFFS_TRACE_ALWAYS,
2504                   (TSTR
2505                    ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
2506                     TENDSTR)));
2507                 YBUG();
2508         }
2509
2510         /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2511         if (obj->myDev->isYaffs2)
2512                 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2513         else
2514                 unlinkOp = (newDir == obj->myDev->unlinkedDir
2515                             && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2516
2517         deleteOp = (newDir == obj->myDev->deletedDir);
2518
2519         existingTarget = yaffs_FindObjectByName(newDir, newName);
2520
2521         /* If the object is a file going into the unlinked directory,
2522          *   then it is OK to just stuff it in since duplicate names are allowed.
2523          *   else only proceed if the new name does not exist and if we're putting
2524          *   it into a directory.
2525          */
2526         if ((unlinkOp ||
2527              deleteOp ||
2528              force ||
2529              (shadows > 0) ||
2530              !existingTarget) &&
2531             newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2532                 yaffs_SetObjectName(obj, newName);
2533                 obj->dirty = 1;
2534
2535                 yaffs_AddObjectToDirectory(newDir, obj);
2536
2537                 if (unlinkOp)
2538                         obj->unlinked = 1;
2539
2540                 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2541                 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
2542                         return YAFFS_OK;
2543         }
2544
2545         return YAFFS_FAIL;
2546 }
2547
2548 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
2549                 yaffs_Object *newDir, const YCHAR *newName)
2550 {
2551         yaffs_Object *obj = NULL;
2552         yaffs_Object *existingTarget = NULL;
2553         int force = 0;
2554         int result;
2555         yaffs_Device *dev;
2556
2557
2558         if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2559                 YBUG();
2560         if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2561                 YBUG();
2562
2563         dev = oldDir->myDev;
2564
2565 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2566         /* Special case for case insemsitive systems (eg. WinCE).
2567          * While look-up is case insensitive, the name isn't.
2568          * Therefore we might want to change x.txt to X.txt
2569         */
2570         if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
2571                 force = 1;
2572 #endif
2573
2574         if(yaffs_strnlen(newName,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH)
2575                 /* ENAMETOOLONG */
2576                 return YAFFS_FAIL;
2577
2578         obj = yaffs_FindObjectByName(oldDir, oldName);
2579
2580         if (obj && obj->renameAllowed) {
2581
2582                 /* Now do the handling for an existing target, if there is one */
2583
2584                 existingTarget = yaffs_FindObjectByName(newDir, newName);
2585                 if (existingTarget &&
2586                         existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2587                         !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
2588                         /* There is a target that is a non-empty directory, so we fail */
2589                         return YAFFS_FAIL;      /* EEXIST or ENOTEMPTY */
2590                 } else if (existingTarget && existingTarget != obj) {
2591                         /* Nuke the target first, using shadowing,
2592                          * but only if it isn't the same object.
2593                          *
2594                          * Note we must disable gc otherwise it can mess up the shadowing.
2595                          *
2596                          */
2597                         dev->isDoingGC=1;
2598                         yaffs_ChangeObjectName(obj, newDir, newName, force,
2599                                                 existingTarget->objectId);
2600                         existingTarget->isShadowed = 1;
2601                         yaffs_UnlinkObject(existingTarget);
2602                         dev->isDoingGC=0;
2603                 }
2604
2605                 result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2606
2607                 yaffs_UpdateParent(oldDir);
2608                 if(newDir != oldDir)
2609                         yaffs_UpdateParent(newDir);
2610
2611                 return result;
2612         }
2613         return YAFFS_FAIL;
2614 }
2615
2616 /*------------------------- Block Management and Page Allocation ----------------*/
2617
2618 static int yaffs_InitialiseBlocks(yaffs_Device *dev)
2619 {
2620         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2621
2622         dev->blockInfo = NULL;
2623         dev->chunkBits = NULL;
2624
2625         dev->allocationBlock = -1;      /* force it to get a new one */
2626
2627         /* If the first allocation strategy fails, thry the alternate one */
2628         dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2629         if (!dev->blockInfo) {
2630                 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2631                 dev->blockInfoAlt = 1;
2632         } else
2633                 dev->blockInfoAlt = 0;
2634
2635         if (dev->blockInfo) {
2636                 /* Set up dynamic blockinfo stuff. */
2637                 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
2638                 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2639                 if (!dev->chunkBits) {
2640                         dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2641                         dev->chunkBitsAlt = 1;
2642                 } else
2643                         dev->chunkBitsAlt = 0;
2644         }
2645
2646         if (dev->blockInfo && dev->chunkBits) {
2647                 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2648                 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2649                 return YAFFS_OK;
2650         }
2651
2652         return YAFFS_FAIL;
2653 }
2654
2655 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2656 {
2657         if (dev->blockInfoAlt && dev->blockInfo)
2658                 YFREE_ALT(dev->blockInfo);
2659         else if (dev->blockInfo)
2660                 YFREE(dev->blockInfo);
2661
2662         dev->blockInfoAlt = 0;
2663
2664         dev->blockInfo = NULL;
2665
2666         if (dev->chunkBitsAlt && dev->chunkBits)
2667                 YFREE_ALT(dev->chunkBits);
2668         else if (dev->chunkBits)
2669                 YFREE(dev->chunkBits);
2670         dev->chunkBitsAlt = 0;
2671         dev->chunkBits = NULL;
2672 }
2673
2674 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
2675                                         yaffs_BlockInfo *bi)
2676 {
2677         int i;
2678         __u32 seq;
2679         yaffs_BlockInfo *b;
2680
2681         if (!dev->isYaffs2)
2682                 return 1;       /* disqualification only applies to yaffs2. */
2683
2684         if (!bi->hasShrinkHeader)
2685                 return 1;       /* can gc */
2686
2687         /* Find the oldest dirty sequence number if we don't know it and save it
2688          * so we don't have to keep recomputing it.
2689          */
2690         if (!dev->oldestDirtySequence) {
2691                 seq = dev->sequenceNumber;
2692
2693                 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2694                                 i++) {
2695                         b = yaffs_GetBlockInfo(dev, i);
2696                         if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2697                             (b->pagesInUse - b->softDeletions) <
2698                             dev->nChunksPerBlock && b->sequenceNumber < seq) {
2699                                 seq = b->sequenceNumber;
2700                         }
2701                 }
2702                 dev->oldestDirtySequence = seq;
2703         }
2704
2705         /* Can't do gc of this block if there are any blocks older than this one that have
2706          * discarded pages.
2707          */
2708         return (bi->sequenceNumber <= dev->oldestDirtySequence);
2709 }
2710
2711 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
2712  * for garbage collection.
2713  */
2714
2715 static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
2716                                         int aggressive)
2717 {
2718         int b = dev->currentDirtyChecker;
2719
2720         int i;
2721         int iterations;
2722         int dirtiest = -1;
2723         int pagesInUse = 0;
2724         int prioritised = 0;
2725         yaffs_BlockInfo *bi;
2726         int pendingPrioritisedExist = 0;
2727
2728         /* First let's see if we need to grab a prioritised block */
2729         if (dev->hasPendingPrioritisedGCs) {
2730                 for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
2731
2732                         bi = yaffs_GetBlockInfo(dev, i);
2733                         /* yaffs_VerifyBlock(dev,bi,i); */
2734
2735                         if (bi->gcPrioritise) {
2736                                 pendingPrioritisedExist = 1;
2737                                 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2738                                    yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2739                                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2740                                         dirtiest = i;
2741                                         prioritised = 1;
2742                                         aggressive = 1; /* Fool the non-aggressive skip logiv below */
2743                                 }
2744                         }
2745                 }
2746
2747                 if (!pendingPrioritisedExist) /* None found, so we can clear this */
2748                         dev->hasPendingPrioritisedGCs = 0;
2749         }
2750
2751         /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2752          * search harder.
2753          * else (we're doing a leasurely gc), then we only bother to do this if the
2754          * block has only a few pages in use.
2755          */
2756
2757         dev->nonAggressiveSkip--;
2758
2759         if (!aggressive && (dev->nonAggressiveSkip > 0))
2760                 return -1;
2761
2762         if (!prioritised)
2763                 pagesInUse =
2764                         (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2765
2766         if (aggressive)
2767                 iterations =
2768                     dev->internalEndBlock - dev->internalStartBlock + 1;
2769         else {
2770                 iterations =
2771                     dev->internalEndBlock - dev->internalStartBlock + 1;
2772                 iterations = iterations / 16;
2773                 if (iterations > 200)
2774                         iterations = 200;
2775         }
2776
2777         for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2778                 b++;
2779                 if (b < dev->internalStartBlock || b > dev->internalEndBlock)
2780                         b = dev->internalStartBlock;
2781
2782                 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2783                         T(YAFFS_TRACE_ERROR,
2784                           (TSTR("**>> Block %d is not valid" TENDSTR), b));
2785                         YBUG();
2786                 }
2787
2788                 bi = yaffs_GetBlockInfo(dev, b);
2789
2790                 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2791                         (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2792                                 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2793                         dirtiest = b;
2794                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2795                 }
2796         }
2797
2798         dev->currentDirtyChecker = b;
2799
2800         if (dirtiest > 0) {
2801                 T(YAFFS_TRACE_GC,
2802                   (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2803                    dev->nChunksPerBlock - pagesInUse, prioritised));
2804         }
2805
2806         dev->oldestDirtySequence = 0;
2807
2808         if (dirtiest > 0)
2809                 dev->nonAggressiveSkip = 4;
2810
2811         return dirtiest;
2812 }
2813
2814 static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
2815 {
2816         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2817
2818         int erasedOk = 0;
2819
2820         /* If the block is still healthy erase it and mark as clean.
2821          * If the block has had a data failure, then retire it.
2822          */
2823
2824         T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2825                 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2826                 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2827
2828         bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2829
2830         if (!bi->needsRetiring) {
2831                 yaffs_InvalidateCheckpoint(dev);
2832                 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2833                 if (!erasedOk) {
2834                         dev->nErasureFailures++;
2835                         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2836                           (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2837                 }
2838         }
2839
2840         if (erasedOk &&
2841             ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2842                 int i;
2843                 for (i = 0; i < dev->nChunksPerBlock; i++) {
2844                         if (!yaffs_CheckChunkErased
2845                             (dev, blockNo * dev->nChunksPerBlock + i)) {
2846                                 T(YAFFS_TRACE_ERROR,
2847                                   (TSTR
2848                                    (">>Block %d erasure supposedly OK, but chunk %d not erased"
2849                                     TENDSTR), blockNo, i));
2850                         }
2851                 }
2852         }
2853
2854         if (erasedOk) {
2855                 /* Clean it up... */
2856                 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2857                 dev->nErasedBlocks++;
2858                 bi->pagesInUse = 0;
2859                 bi->softDeletions = 0;
2860                 bi->hasShrinkHeader = 0;
2861                 bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
2862                 bi->gcPrioritise = 0;
2863                 yaffs_ClearChunkBits(dev, blockNo);
2864
2865                 T(YAFFS_TRACE_ERASE,
2866                   (TSTR("Erased block %d" TENDSTR), blockNo));
2867         } else {
2868                 dev->nFreeChunks -= dev->nChunksPerBlock;       /* We lost a block of free space */
2869
2870                 yaffs_RetireBlock(dev, blockNo);
2871                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2872                   (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2873         }
2874 }
2875
2876 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2877 {
2878         int i;
2879
2880         yaffs_BlockInfo *bi;
2881
2882         if (dev->nErasedBlocks < 1) {
2883                 /* Hoosterman we've got a problem.
2884                  * Can't get space to gc
2885                  */
2886                 T(YAFFS_TRACE_ERROR,
2887                   (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
2888
2889                 return -1;
2890         }
2891
2892         /* Find an empty block. */
2893
2894         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2895                 dev->allocationBlockFinder++;
2896                 if (dev->allocationBlockFinder < dev->internalStartBlock
2897                     || dev->allocationBlockFinder > dev->internalEndBlock) {
2898                         dev->allocationBlockFinder = dev->internalStartBlock;
2899                 }
2900
2901                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2902
2903                 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2904                         bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2905                         dev->sequenceNumber++;
2906                         bi->sequenceNumber = dev->sequenceNumber;
2907                         dev->nErasedBlocks--;
2908                         T(YAFFS_TRACE_ALLOCATE,
2909                           (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
2910                            dev->allocationBlockFinder, dev->sequenceNumber,
2911                            dev->nErasedBlocks));
2912                         return dev->allocationBlockFinder;
2913                 }
2914         }
2915
2916         T(YAFFS_TRACE_ALWAYS,
2917           (TSTR
2918            ("yaffs tragedy: no more erased blocks, but there should have been %d"
2919             TENDSTR), dev->nErasedBlocks));
2920
2921         return -1;
2922 }
2923
2924
2925
2926 static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
2927 {
2928         if (!dev->nCheckpointBlocksRequired &&
2929            dev->isYaffs2) {
2930                 /* Not a valid value so recalculate */
2931                 int nBytes = 0;
2932                 int nBlocks;
2933                 int devBlocks = (dev->endBlock - dev->startBlock + 1);
2934                 int tnodeSize = yaffs_CalcTnodeSize(dev);
2935
2936                 nBytes += sizeof(yaffs_CheckpointValidity);
2937                 nBytes += sizeof(yaffs_CheckpointDevice);
2938                 nBytes += devBlocks * sizeof(yaffs_BlockInfo);
2939                 nBytes += devBlocks * dev->chunkBitmapStride;
2940                 nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
2941                 nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
2942                 nBytes += sizeof(yaffs_CheckpointValidity);
2943                 nBytes += sizeof(__u32); /* checksum*/
2944
2945                 /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
2946
2947                 nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->nChunksPerBlock)) + 3;
2948
2949                 dev->nCheckpointBlocksRequired = nBlocks;
2950         }
2951
2952         return dev->nCheckpointBlocksRequired;
2953 }
2954
2955 /*
2956  * Check if there's space to allocate...
2957  * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2958  */
2959 static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev)
2960 {
2961         int reservedChunks;
2962         int reservedBlocks = dev->nReservedBlocks;
2963         int checkpointBlocks;
2964
2965         if (dev->isYaffs2) {
2966                 checkpointBlocks =  yaffs_CalcCheckpointBlocksRequired(dev) -
2967                                     dev->blocksInCheckpoint;
2968                 if (checkpointBlocks < 0)
2969                         checkpointBlocks = 0;
2970         } else {
2971                 checkpointBlocks = 0;
2972         }
2973
2974         reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
2975
2976         return (dev->nFreeChunks > reservedChunks);
2977 }
2978
2979 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
2980                 yaffs_BlockInfo **blockUsedPtr)
2981 {
2982         int retVal;
2983         yaffs_BlockInfo *bi;
2984
2985         if (dev->allocationBlock < 0) {
2986                 /* Get next block to allocate off */
2987                 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2988                 dev->allocationPage = 0;
2989         }
2990
2991         if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2992                 /* Not enough space to allocate unless we're allowed to use the reserve. */
2993                 return -1;
2994         }
2995
2996         if (dev->nErasedBlocks < dev->nReservedBlocks
2997                         && dev->allocationPage == 0) {
2998                 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2999         }
3000
3001         /* Next page please.... */
3002         if (dev->allocationBlock >= 0) {
3003                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3004
3005                 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
3006                         dev->allocationPage;
3007                 bi->pagesInUse++;
3008                 yaffs_SetChunkBit(dev, dev->allocationBlock,
3009                                 dev->allocationPage);
3010
3011                 dev->allocationPage++;
3012
3013                 dev->nFreeChunks--;
3014
3015                 /* If the block is full set the state to full */
3016                 if (dev->allocationPage >= dev->nChunksPerBlock) {
3017                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
3018                         dev->allocationBlock = -1;
3019                 }
3020
3021                 if (blockUsedPtr)
3022                         *blockUsedPtr = bi;
3023
3024                 return retVal;
3025         }
3026
3027         T(YAFFS_TRACE_ERROR,
3028                         (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
3029
3030         return -1;
3031 }
3032
3033 static int yaffs_GetErasedChunks(yaffs_Device *dev)
3034 {
3035         int n;
3036
3037         n = dev->nErasedBlocks * dev->nChunksPerBlock;
3038
3039         if (dev->allocationBlock > 0)
3040                 n += (dev->nChunksPerBlock - dev->allocationPage);
3041
3042         return n;
3043
3044 }
3045
3046 /*
3047  * yaffs_SkipRestOfBlock() skips over the rest of the allocation block
3048  * if we don't want to write to it.
3049  */
3050 static void yaffs_SkipRestOfBlock(yaffs_Device *dev)
3051 {
3052         if(dev->allocationBlock > 0){
3053                 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
3054                 if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){
3055                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
3056                         dev->allocationBlock = -1;
3057                 }
3058         }
3059 }
3060
3061
3062 static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
3063                 int wholeBlock)
3064 {
3065         int oldChunk;
3066         int newChunk;
3067         int markNAND;
3068         int retVal = YAFFS_OK;
3069         int cleanups = 0;
3070         int i;
3071         int isCheckpointBlock;
3072         int matchingChunk;
3073         int maxCopies;
3074
3075         int chunksBefore = yaffs_GetErasedChunks(dev);
3076         int chunksAfter;
3077
3078         yaffs_ExtendedTags tags;
3079
3080         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
3081
3082         yaffs_Object *object;
3083
3084         isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
3085
3086
3087         T(YAFFS_TRACE_TRACING,
3088                         (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
3089                          block,
3090                          bi->pagesInUse,
3091                          bi->hasShrinkHeader,
3092                          wholeBlock));
3093
3094         /*yaffs_VerifyFreeChunks(dev); */
3095
3096         if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
3097                 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
3098
3099         bi->hasShrinkHeader = 0;        /* clear the flag so that the block can erase */
3100
3101         /* Take off the number of soft deleted entries because
3102          * they're going to get really deleted during GC.
3103          */
3104         if(dev->gcChunk == 0) /* first time through for this block */
3105                 dev->nFreeChunks -= bi->softDeletions;
3106
3107         dev->isDoingGC = 1;
3108
3109         if (isCheckpointBlock ||
3110                         !yaffs_StillSomeChunkBits(dev, block)) {
3111                 T(YAFFS_TRACE_TRACING,
3112                                 (TSTR
3113                                  ("Collecting block %d that has no chunks in use" TENDSTR),
3114                                  block));
3115                 yaffs_BlockBecameDirty(dev, block);
3116         } else {
3117
3118                 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
3119
3120                 yaffs_VerifyBlock(dev, bi, block);
3121
3122                 maxCopies = (wholeBlock) ? dev->nChunksPerBlock : 10;
3123                 oldChunk = block * dev->nChunksPerBlock + dev->gcChunk;
3124
3125                 for (/* init already done */;
3126                      retVal == YAFFS_OK &&
3127                      dev->gcChunk < dev->nChunksPerBlock &&
3128                      (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
3129                      maxCopies > 0;
3130                      dev->gcChunk++, oldChunk++) {
3131                         if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
3132
3133                                 /* This page is in use and might need to be copied off */
3134
3135                                 maxCopies--;
3136
3137                                 markNAND = 1;
3138
3139                                 yaffs_InitialiseTags(&tags);
3140
3141                                 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
3142                                                                 buffer, &tags);
3143
3144                                 object =
3145                                     yaffs_FindObjectByNumber(dev,
3146                                                              tags.objectId);
3147
3148                                 T(YAFFS_TRACE_GC_DETAIL,
3149                                   (TSTR
3150                                    ("Collecting chunk in block %d, %d %d %d " TENDSTR),
3151                                    dev->gcChunk, tags.objectId, tags.chunkId,
3152                                    tags.byteCount));
3153
3154                                 if (object && !yaffs_SkipVerification(dev)) {
3155                                         if (tags.chunkId == 0)
3156                                                 matchingChunk = object->hdrChunk;
3157                                         else if (object->softDeleted)
3158                                                 matchingChunk = oldChunk; /* Defeat the test */
3159                                         else
3160                                                 matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
3161
3162                                         if (oldChunk != matchingChunk)
3163                                                 T(YAFFS_TRACE_ERROR,
3164                                                   (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
3165                                                   oldChunk, matchingChunk, tags.objectId, tags.chunkId));
3166
3167                                 }
3168
3169                                 if (!object) {
3170                                         T(YAFFS_TRACE_ERROR,
3171                                           (TSTR
3172                                            ("page %d in gc has no object: %d %d %d "
3173                                             TENDSTR), oldChunk,
3174                                             tags.objectId, tags.chunkId, tags.byteCount));
3175                                 }
3176
3177                                 if (object &&
3178                                     object->deleted &&
3179                                     object->softDeleted &&
3180                                     tags.chunkId != 0) {
3181                                         /* Data chunk in a soft deleted file, throw it away
3182                                          * It's a soft deleted data chunk,
3183                                          * No need to copy this, just forget about it and
3184                                          * fix up the object.
3185                                          */
3186
3187                                         object->nDataChunks--;
3188
3189                                         if (object->nDataChunks <= 0) {
3190                                                 /* remeber to clean up the object */
3191                                                 dev->gcCleanupList[cleanups] =
3192                                                     tags.objectId;
3193                                                 cleanups++;
3194                                         }
3195                                         markNAND = 0;
3196                                 } else if (0) {
3197                                         /* Todo object && object->deleted && object->nDataChunks == 0 */
3198                                         /* Deleted object header with no data chunks.
3199                                          * Can be discarded and the file deleted.
3200                                          */
3201                                         object->hdrChunk = 0;
3202                                         yaffs_FreeTnode(object->myDev,
3203                                                         object->variant.
3204                                                         fileVariant.top);
3205                                         object->variant.fileVariant.top = NULL;
3206                                         yaffs_DoGenericObjectDeletion(object);
3207
3208                                 } else if (object) {
3209                                         /* It's either a data chunk in a live file or
3210                                          * an ObjectHeader, so we're interested in it.
3211                                          * NB Need to keep the ObjectHeaders of deleted files
3212                                          * until the whole file has been deleted off
3213                                          */
3214                                         tags.serialNumber++;
3215
3216                                         dev->nGCCopies++;
3217
3218                                         if (tags.chunkId == 0) {
3219                                                 /* It is an object Id,
3220                                                  * We need to nuke the shrinkheader flags first
3221                                                  * Also need to clean up shadowing.
3222                                                  * We no longer want the shrinkHeader flag since its work is done
3223                                                  * and if it is left in place it will mess up scanning.
3224                                                  */
3225
3226                                                 yaffs_ObjectHeader *oh;
3227                                                 oh = (yaffs_ObjectHeader *)buffer;
3228                                                 oh->isShrink = 0;
3229                                                 tags.extraIsShrinkHeader = 0;
3230                                                 oh->shadowsObject = 0;
3231                                                 oh->inbandShadowsObject = 0;
3232                                                 tags.extraShadows = 0;
3233
3234                                                 yaffs_VerifyObjectHeader(object, oh, &tags, 1);
3235                                         }
3236
3237                                         newChunk =
3238                                             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3239
3240                                         if (newChunk < 0) {
3241                                                 retVal = YAFFS_FAIL;
3242                                         } else {
3243
3244                                                 /* Ok, now fix up the Tnodes etc. */
3245
3246                                                 if (tags.chunkId == 0) {
3247                                                         /* It's a header */
3248                                                         object->hdrChunk =  newChunk;
3249                                                         object->serial =   tags.serialNumber;
3250                                                 } else {
3251                                                         /* It's a data chunk */
3252                                                         int ok;
3253                                                         ok = yaffs_PutChunkIntoFile
3254                                                             (object,
3255                                                              tags.chunkId,
3256                                                              newChunk, 0);
3257                                                 }
3258                                         }
3259                                 }
3260
3261                                 if (retVal == YAFFS_OK)
3262                                         yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3263
3264                         }
3265                 }
3266
3267                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3268
3269
3270                 /* Do any required cleanups */
3271                 for (i = 0; i < cleanups; i++) {
3272                         /* Time to delete the file too */
3273                         object =
3274                             yaffs_FindObjectByNumber(dev,
3275                                                      dev->gcCleanupList[i]);
3276                         if (object) {
3277                                 yaffs_FreeTnode(dev,
3278                                                 object->variant.fileVariant.
3279                                                 top);
3280                                 object->variant.fileVariant.top = NULL;
3281                                 T(YAFFS_TRACE_GC,
3282                                   (TSTR
3283                                    ("yaffs: About to finally delete object %d"
3284                                     TENDSTR), object->objectId));
3285                                 yaffs_DoGenericObjectDeletion(object);
3286                                 object->myDev->nDeletedFiles--;
3287                         }
3288
3289                 }
3290
3291         }
3292
3293         yaffs_VerifyCollectedBlock(dev, bi, block);
3294
3295         chunksAfter = yaffs_GetErasedChunks(dev);
3296         if (chunksBefore >= chunksAfter) {
3297                 T(YAFFS_TRACE_GC,
3298                   (TSTR
3299                    ("gc did not increase free chunks before %d after %d"
3300                     TENDSTR), chunksBefore, chunksAfter));
3301         }
3302
3303         /* If the gc completed then clear the current gcBlock so that we find another. */
3304         if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
3305                 dev->gcBlock = -1;
3306                 dev->gcChunk = 0;
3307         }
3308
3309         dev->isDoingGC = 0;
3310
3311         return retVal;
3312 }
3313
3314 /* New garbage collector
3315  * If we're very low on erased blocks then we do aggressive garbage collection
3316  * otherwise we do "leasurely" garbage collection.
3317  * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3318  * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3319  *
3320  * The idea is to help clear out space in a more spread-out manner.
3321  * Dunno if it really does anything useful.
3322  */
3323 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
3324 {
3325         int block;
3326         int aggressive;
3327         int gcOk = YAFFS_OK;
3328         int maxTries = 0;
3329
3330         int checkpointBlockAdjust;
3331
3332         if (dev->isDoingGC) {
3333                 /* Bail out so we don't get recursive gc */
3334                 return YAFFS_OK;
3335         }
3336
3337         /* This loop should pass the first time.
3338          * We'll only see looping here if the erase of the collected block fails.
3339          */
3340
3341         do {
3342                 maxTries++;
3343
3344                 checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
3345                 if (checkpointBlockAdjust < 0)
3346                         checkpointBlockAdjust = 0;
3347
3348                 if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
3349                         /* We need a block soon...*/
3350                         aggressive = 1;
3351                 } else {
3352                         /* We're in no hurry */
3353                         aggressive = 0;
3354                 }
3355
3356                 if (dev->gcBlock <= 0) {
3357                         dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3358                         dev->gcChunk = 0;
3359                 }
3360
3361                 block = dev->gcBlock;
3362
3363                 if (block > 0) {
3364                         dev->garbageCollections++;
3365                         if (!aggressive)
3366                                 dev->passiveGarbageCollections++;
3367
3368                         T(YAFFS_TRACE_GC,
3369                           (TSTR
3370                            ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3371                            dev->nErasedBlocks, aggressive));
3372
3373                         gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
3374                 }
3375
3376                 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
3377                         T(YAFFS_TRACE_GC,
3378                           (TSTR
3379                            ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3380                             TENDSTR), dev->nErasedBlocks, maxTries, block));
3381                 }
3382         } while ((dev->nErasedBlocks < dev->nReservedBlocks) &&
3383                  (block > 0) &&
3384                  (maxTries < 2));
3385
3386         return aggressive ? gcOk : YAFFS_OK;
3387 }
3388
3389 /*-------------------------  TAGS --------------------------------*/
3390
3391 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
3392                            int chunkInObject)
3393 {
3394         return (tags->chunkId == chunkInObject &&
3395                 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3396
3397 }
3398
3399
3400 /*-------------------- Data file manipulation -----------------*/
3401
3402 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
3403                                  yaffs_ExtendedTags *tags)
3404 {
3405         /*Get the Tnode, then get the level 0 offset chunk offset */
3406         yaffs_Tnode *tn;
3407         int theChunk = -1;
3408         yaffs_ExtendedTags localTags;
3409         int retVal = -1;
3410
3411         yaffs_Device *dev = in->myDev;
3412
3413         if (!tags) {
3414                 /* Passed a NULL, so use our own tags space */
3415                 tags = &localTags;
3416         }
3417
3418         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3419
3420         if (tn) {
3421                 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3422
3423                 retVal =
3424                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3425                                            chunkInInode);
3426         }
3427         return retVal;
3428 }
3429
3430 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
3431                                           yaffs_ExtendedTags *tags)
3432 {
3433         /* Get the Tnode, then get the level 0 offset chunk offset */
3434         yaffs_Tnode *tn;
3435         int theChunk = -1;
3436         yaffs_ExtendedTags localTags;
3437
3438         yaffs_Device *dev = in->myDev;
3439         int retVal = -1;
3440
3441         if (!tags) {
3442                 /* Passed a NULL, so use our own tags space */
3443                 tags = &localTags;
3444         }
3445
3446         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3447
3448         if (tn) {
3449
3450                 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3451
3452                 retVal =
3453                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3454                                            chunkInInode);
3455
3456                 /* Delete the entry in the filestructure (if found) */
3457                 if (retVal != -1)
3458                         yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0);
3459         }
3460
3461         return retVal;
3462 }
3463
3464 #ifdef YAFFS_PARANOID
3465
3466 static int yaffs_CheckFileSanity(yaffs_Object *in)
3467 {
3468         int chunk;
3469         int nChunks;
3470         int fSize;
3471         int failed = 0;
3472         int objId;
3473         yaffs_Tnode *tn;
3474         yaffs_Tags localTags;
3475         yaffs_Tags *tags = &localTags;
3476         int theChunk;
3477         int chunkDeleted;
3478
3479         if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
3480                 return YAFFS_FAIL;
3481
3482         objId = in->objectId;
3483         fSize = in->variant.fileVariant.fileSize;
3484         nChunks =
3485             (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3486
3487         for (chunk = 1; chunk <= nChunks; chunk++) {
3488                 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3489                                            chunk);
3490
3491                 if (tn) {
3492
3493                         theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
3494
3495                         if (yaffs_CheckChunkBits
3496                             (dev, theChunk / dev->nChunksPerBlock,
3497                              theChunk % dev->nChunksPerBlock)) {
3498
3499                                 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3500                                                             tags,
3501                                                             &chunkDeleted);
3502                                 if (yaffs_TagsMatch
3503                                     (tags, in->objectId, chunk, chunkDeleted)) {
3504                                         /* found it; */
3505
3506                                 }
3507                         } else {
3508
3509                                 failed = 1;
3510                         }
3511
3512                 } else {
3513                         /* T(("No level 0 found for %d\n", chunk)); */
3514                 }
3515         }
3516
3517         return failed ? YAFFS_FAIL : YAFFS_OK;
3518 }
3519
3520 #endif
3521
3522 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
3523                                   int chunkInNAND, int inScan)
3524 {
3525         /* NB inScan is zero unless scanning.
3526          * For forward scanning, inScan is > 0;
3527          * for backward scanning inScan is < 0
3528          *
3529          * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there.
3530          */
3531
3532         yaffs_Tnode *tn;
3533         yaffs_Device *dev = in->myDev;
3534         int existingChunk;
3535         yaffs_ExtendedTags existingTags;
3536         yaffs_ExtendedTags newTags;
3537         unsigned existingSerial, newSerial;
3538
3539         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3540                 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3541                  * If it is not during Scanning then something went wrong!
3542                  */
3543                 if (!inScan) {
3544                         T(YAFFS_TRACE_ERROR,
3545                           (TSTR
3546                            ("yaffs tragedy:attempt to put data chunk into a non-file"
3547                             TENDSTR)));
3548                         YBUG();
3549                 }
3550
3551                 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3552                 return YAFFS_OK;
3553         }
3554
3555         tn = yaffs_AddOrFindLevel0Tnode(dev,
3556                                         &in->variant.fileVariant,
3557                                         chunkInInode,
3558                                         NULL);
3559         if (!tn)
3560                 return YAFFS_FAIL;
3561
3562         if(!chunkInNAND)
3563                 /* Dummy insert, bail now */
3564                 return YAFFS_OK;
3565
3566         existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3567
3568         if (inScan != 0) {
3569                 /* If we're scanning then we need to test for duplicates
3570                  * NB This does not need to be efficient since it should only ever
3571                  * happen when the power fails during a write, then only one
3572                  * chunk should ever be affected.
3573                  *
3574                  * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3575                  * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3576                  */
3577
3578                 if (existingChunk > 0) {
3579                         /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3580                          *    thus we have to do a FindChunkInFile to get the real chunk id.
3581                          *
3582                          * We have a duplicate now we need to decide which one to use:
3583                          *
3584                          * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3585                          * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3586                          * YAFFS1: Get both sets of tags and compare serial numbers.
3587                          */
3588
3589                         if (inScan > 0) {
3590                                 /* Only do this for forward scanning */
3591                                 yaffs_ReadChunkWithTagsFromNAND(dev,
3592                                                                 chunkInNAND,
3593                                                                 NULL, &newTags);
3594
3595                                 /* Do a proper find */
3596                                 existingChunk =
3597                                     yaffs_FindChunkInFile(in, chunkInInode,
3598                                                           &existingTags);
3599                         }
3600
3601                         if (existingChunk <= 0) {
3602                                 /*Hoosterman - how did this happen? */
3603
3604                                 T(YAFFS_TRACE_ERROR,
3605                                   (TSTR
3606                                    ("yaffs tragedy: existing chunk < 0 in scan"
3607                                     TENDSTR)));
3608
3609                         }
3610
3611                         /* NB The deleted flags should be false, otherwise the chunks will
3612                          * not be loaded during a scan
3613                          */
3614
3615                         if (inScan > 0) {
3616                                 newSerial = newTags.serialNumber;
3617                                 existingSerial = existingTags.serialNumber;
3618                         }
3619
3620                         if ((inScan > 0) &&
3621                             (in->myDev->isYaffs2 ||
3622                              existingChunk <= 0 ||
3623                              ((existingSerial + 1) & 3) == newSerial)) {
3624                                 /* Forward scanning.
3625                                  * Use new
3626                                  * Delete the old one and drop through to update the tnode
3627                                  */
3628                                 yaffs_DeleteChunk(dev, existingChunk, 1,
3629                                                   __LINE__);
3630                         } else {
3631                                 /* Backward scanning or we want to use the existing one
3632                                  * Use existing.
3633                                  * Delete the new one and return early so that the tnode isn't changed
3634                                  */
3635                                 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3636                                                   __LINE__);
3637                                 return YAFFS_OK;
3638                         }
3639                 }
3640
3641         }
3642
3643         if (existingChunk == 0)
3644                 in->nDataChunks++;
3645
3646         yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
3647
3648         return YAFFS_OK;
3649 }
3650
3651 static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
3652                                         __u8 *buffer)
3653 {
3654         int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3655
3656         if (chunkInNAND >= 0)
3657                 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3658                                                 buffer, NULL);
3659         else {
3660                 T(YAFFS_TRACE_NANDACCESS,
3661                   (TSTR("Chunk %d not found zero instead" TENDSTR),
3662                    chunkInNAND));
3663                 /* get sane (zero) data if you read a hole */
3664                 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3665                 return 0;
3666         }
3667
3668 }
3669
3670 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
3671 {
3672         int block;
3673         int page;
3674         yaffs_ExtendedTags tags;
3675         yaffs_BlockInfo *bi;
3676
3677         if (chunkId <= 0)
3678                 return;
3679
3680         dev->nDeletions++;
3681         block = chunkId / dev->nChunksPerBlock;
3682         page = chunkId % dev->nChunksPerBlock;
3683
3684
3685         if (!yaffs_CheckChunkBit(dev, block, page))
3686                 T(YAFFS_TRACE_VERIFY,
3687                         (TSTR("Deleting invalid chunk %d"TENDSTR),
3688                          chunkId));
3689
3690         bi = yaffs_GetBlockInfo(dev, block);
3691
3692         T(YAFFS_TRACE_DELETION,
3693           (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3694
3695         if (markNAND &&
3696             bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
3697
3698                 yaffs_InitialiseTags(&tags);
3699
3700                 tags.chunkDeleted = 1;
3701
3702                 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3703                 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3704         } else {
3705                 dev->nUnmarkedDeletions++;
3706         }
3707
3708         /* Pull out of the management area.
3709          * If the whole block became dirty, this will kick off an erasure.
3710          */
3711         if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3712             bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3713             bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3714             bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3715                 dev->nFreeChunks++;
3716
3717                 yaffs_ClearChunkBit(dev, block, page);
3718
3719                 bi->pagesInUse--;
3720
3721                 if (bi->pagesInUse == 0 &&
3722                     !bi->hasShrinkHeader &&
3723                     bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3724                     bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3725                         yaffs_BlockBecameDirty(dev, block);
3726                 }
3727
3728         }
3729
3730 }
3731
3732 static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
3733                                         const __u8 *buffer, int nBytes,
3734                                         int useReserve)
3735 {
3736         /* Find old chunk Need to do this to get serial number
3737          * Write new one and patch into tree.
3738          * Invalidate old tags.
3739          */
3740
3741         int prevChunkId;
3742         yaffs_ExtendedTags prevTags;
3743
3744         int newChunkId;
3745         yaffs_ExtendedTags newTags;
3746
3747         yaffs_Device *dev = in->myDev;
3748
3749         yaffs_CheckGarbageCollection(dev);
3750
3751         /* Get the previous chunk at this location in the file if it exists.
3752          * If it does not exist then put a zero into the tree. This creates
3753          * the tnode now, rather than later when it is harder to clean up.
3754          */
3755         prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3756         if(prevChunkId <= 0 &&
3757                 !yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0)){
3758         }
3759
3760         /* Set up new tags */
3761         yaffs_InitialiseTags(&newTags);
3762
3763         newTags.chunkId = chunkInInode;
3764         newTags.objectId = in->objectId;
3765         newTags.serialNumber =
3766             (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
3767         newTags.byteCount = nBytes;
3768
3769         if (nBytes < 1 || nBytes > dev->totalBytesPerChunk) {
3770                 T(YAFFS_TRACE_ERROR,
3771                 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
3772                 YBUG();
3773         }
3774
3775         /*
3776          * If there isn't already a chunk there then do a dummy
3777          * insert to make sue we have the desired tnode structure.
3778          */
3779         if(prevChunkId < 1 &&
3780                 yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0) != YAFFS_OK)
3781                 return -1;
3782
3783         newChunkId =
3784             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3785                                               useReserve);
3786
3787         if (newChunkId > 0) {
3788                 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3789
3790                 if (prevChunkId > 0)
3791                         yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3792
3793                 yaffs_CheckFileSanity(in);
3794         }
3795         return newChunkId;
3796
3797 }
3798
3799 /* UpdateObjectHeader updates the header on NAND for an object.
3800  * If name is not NULL, then that new name is used.
3801  */
3802 int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
3803                              int isShrink, int shadows)
3804 {
3805
3806         yaffs_BlockInfo *bi;
3807
3808         yaffs_Device *dev = in->myDev;
3809
3810         int prevChunkId;
3811         int retVal = 0;
3812         int result = 0;
3813
3814         int newChunkId;
3815         yaffs_ExtendedTags newTags;
3816         yaffs_ExtendedTags oldTags;
3817         YCHAR *alias = NULL;
3818
3819         __u8 *buffer = NULL;
3820         YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3821
3822         yaffs_ObjectHeader *oh = NULL;
3823
3824         yaffs_strcpy(oldName, _Y("silly old name"));
3825
3826
3827         if (!in->fake ||
3828                 in == dev->rootDir || /* The rootDir should also be saved */
3829                 force) {
3830
3831                 yaffs_CheckGarbageCollection(dev);
3832                 yaffs_CheckObjectDetailsLoaded(in);
3833
3834                 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3835                 oh = (yaffs_ObjectHeader *) buffer;
3836
3837                 prevChunkId = in->hdrChunk;
3838
3839                 if (prevChunkId > 0) {
3840                         result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3841                                                         buffer, &oldTags);
3842
3843                         yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
3844
3845                         memcpy(oldName, oh->name, sizeof(oh->name));
3846                 }
3847
3848                 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3849
3850                 oh->type = in->variantType;
3851                 oh->yst_mode = in->yst_mode;
3852                 oh->shadowsObject = oh->inbandShadowsObject = shadows;
3853
3854 #ifdef CONFIG_YAFFS_WINCE
3855                 oh->win_atime[0] = in->win_atime[0];
3856                 oh->win_ctime[0] = in->win_ctime[0];
3857                 oh->win_mtime[0] = in->win_mtime[0];
3858                 oh->win_atime[1] = in->win_atime[1];
3859                 oh->win_ctime[1] = in->win_ctime[1];
3860                 oh->win_mtime[1] = in->win_mtime[1];
3861 #else
3862                 oh->yst_uid = in->yst_uid;
3863                 oh->yst_gid = in->yst_gid;
3864                 oh->yst_atime = in->yst_atime;
3865                 oh->yst_mtime = in->yst_mtime;
3866                 oh->yst_ctime = in->yst_ctime;
3867                 oh->yst_rdev = in->yst_rdev;
3868 #endif
3869                 if (in->parent)
3870                         oh->parentObjectId = in->parent->objectId;
3871                 else
3872                         oh->parentObjectId = 0;
3873
3874                 if (name && *name) {
3875                         memset(oh->name, 0, sizeof(oh->name));
3876                         yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3877                 } else if (prevChunkId > 0)
3878                         memcpy(oh->name, oldName, sizeof(oh->name));
3879                 else
3880                         memset(oh->name, 0, sizeof(oh->name));
3881
3882                 oh->isShrink = isShrink;
3883
3884                 switch (in->variantType) {
3885                 case YAFFS_OBJECT_TYPE_UNKNOWN:
3886                         /* Should not happen */
3887                         break;
3888                 case YAFFS_OBJECT_TYPE_FILE:
3889                         oh->fileSize =
3890                             (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3891                              || oh->parentObjectId ==
3892                              YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3893                             fileVariant.fileSize;
3894                         break;
3895                 case YAFFS_OBJECT_TYPE_HARDLINK:
3896                         oh->equivalentObjectId =
3897                             in->variant.hardLinkVariant.equivalentObjectId;
3898                         break;
3899                 case YAFFS_OBJECT_TYPE_SPECIAL:
3900                         /* Do nothing */
3901                         break;
3902                 case YAFFS_OBJECT_TYPE_DIRECTORY:
3903                         /* Do nothing */
3904                         break;
3905                 case YAFFS_OBJECT_TYPE_SYMLINK:
3906                         alias = in->variant.symLinkVariant.alias;
3907                         if(!alias)
3908                                 alias = _Y("no alias");
3909                         yaffs_strncpy(oh->alias,
3910                                         alias,
3911                                       YAFFS_MAX_ALIAS_LENGTH);
3912                         oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3913                         break;
3914                 }
3915
3916                 /* Tags */
3917                 yaffs_InitialiseTags(&newTags);
3918                 in->serial++;
3919                 newTags.chunkId = 0;
3920                 newTags.objectId = in->objectId;
3921                 newTags.serialNumber = in->serial;
3922
3923                 /* Add extra info for file header */
3924
3925                 newTags.extraHeaderInfoAvailable = 1;
3926                 newTags.extraParentObjectId = oh->parentObjectId;
3927                 newTags.extraFileLength = oh->fileSize;
3928                 newTags.extraIsShrinkHeader = oh->isShrink;
3929                 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3930                 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3931                 newTags.extraObjectType = in->variantType;
3932
3933                 yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
3934
3935                 /* Create new chunk in NAND */
3936                 newChunkId =
3937                     yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3938                                                       (prevChunkId > 0) ? 1 : 0);
3939
3940                 if (newChunkId >= 0) {
3941
3942                         in->hdrChunk = newChunkId;
3943
3944                         if (prevChunkId > 0) {
3945                                 yaffs_DeleteChunk(dev, prevChunkId, 1,
3946                                                   __LINE__);
3947                         }
3948
3949                         if (!yaffs_ObjectHasCachedWriteData(in))
3950                                 in->dirty = 0;
3951
3952                         /* If this was a shrink, then mark the block that the chunk lives on */
3953                         if (isShrink) {
3954                                 bi = yaffs_GetBlockInfo(in->myDev,
3955                                         newChunkId / in->myDev->nChunksPerBlock);
3956                                 bi->hasShrinkHeader = 1;
3957                         }
3958
3959                 }
3960
3961                 retVal = newChunkId;
3962
3963         }
3964
3965         if (buffer)
3966                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3967
3968         return retVal;
3969 }
3970
3971 /*------------------------ Short Operations Cache ----------------------------------------
3972  *   In many situations where there is no high level buffering (eg WinCE) a lot of
3973  *   reads might be short sequential reads, and a lot of writes may be short
3974  *   sequential writes. eg. scanning/writing a jpeg file.
3975  *   In these cases, a short read/write cache can provide a huge perfomance benefit
3976  *   with dumb-as-a-rock code.
3977  *   In Linux, the page cache provides read buffering aand the short op cache provides write
3978  *   buffering.
3979  *
3980  *   There are a limited number (~10) of cache chunks per device so that we don't
3981  *   need a very intelligent search.
3982  */
3983
3984 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3985 {
3986         yaffs_Device *dev = obj->myDev;
3987         int i;
3988         yaffs_ChunkCache *cache;
3989         int nCaches = obj->myDev->nShortOpCaches;
3990
3991         for (i = 0; i < nCaches; i++) {
3992                 cache = &dev->srCache[i];
3993                 if (cache->object == obj &&
3994                     cache->dirty)
3995                         return 1;
3996         }
3997
3998         return 0;
3999 }
4000
4001
4002 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
4003 {
4004         yaffs_Device *dev = obj->myDev;
4005         int lowest = -99;       /* Stop compiler whining. */
4006         int i;
4007         yaffs_ChunkCache *cache;
4008         int chunkWritten = 0;
4009         int nCaches = obj->myDev->nShortOpCaches;
4010
4011         if (nCaches > 0) {
4012                 do {
4013                         cache = NULL;
4014
4015                         /* Find the dirty cache for this object with the lowest chunk id. */
4016                         for (i = 0; i < nCaches; i++) {
4017                                 if (dev->srCache[i].object == obj &&
4018                                     dev->srCache[i].dirty) {
4019                                         if (!cache
4020                                             || dev->srCache[i].chunkId <
4021                                             lowest) {
4022                                                 cache = &dev->srCache[i];
4023                                                 lowest = cache->chunkId;
4024                                         }
4025                                 }
4026                         }
4027
4028                         if (cache && !cache->locked) {
4029                                 /* Write it out and free it up */
4030
4031                                 chunkWritten =
4032                                     yaffs_WriteChunkDataToObject(cache->object,
4033                                                                  cache->chunkId,
4034                                                                  cache->data,
4035                                                                  cache->nBytes,
4036                                                                  1);
4037                                 cache->dirty = 0;
4038                                 cache->object = NULL;
4039                         }
4040
4041                 } while (cache && chunkWritten > 0);
4042
4043                 if (cache) {
4044                         /* Hoosterman, disk full while writing cache out. */
4045                         T(YAFFS_TRACE_ERROR,
4046                           (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
4047
4048                 }
4049         }
4050
4051 }
4052
4053 /*yaffs_FlushEntireDeviceCache(dev)
4054  *
4055  *
4056  */
4057
4058 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
4059 {
4060         yaffs_Object *obj;
4061         int nCaches = dev->nShortOpCaches;
4062         int i;
4063
4064         /* Find a dirty object in the cache and flush it...
4065          * until there are no further dirty objects.
4066          */
4067         do {
4068                 obj = NULL;
4069                 for (i = 0; i < nCaches && !obj; i++) {
4070                         if (dev->srCache[i].object &&
4071                             dev->srCache[i].dirty)
4072                                 obj = dev->srCache[i].object;
4073
4074                 }
4075                 if (obj)
4076                         yaffs_FlushFilesChunkCache(obj);
4077
4078         } while (obj);
4079
4080 }
4081
4082
4083 /* Grab us a cache chunk for use.
4084  * First look for an empty one.
4085  * Then look for the least recently used non-dirty one.
4086  * Then look for the least recently used dirty one...., flush and look again.
4087  */
4088 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
4089 {
4090         int i;
4091
4092         if (dev->nShortOpCaches > 0) {
4093                 for (i = 0; i < dev->nShortOpCaches; i++) {
4094                         if (!dev->srCache[i].object)
4095                                 return &dev->srCache[i];
4096                 }
4097         }
4098
4099         return NULL;
4100 }
4101
4102 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
4103 {
4104         yaffs_ChunkCache *cache;
4105         yaffs_Object *theObj;
4106         int usage;
4107         int i;
4108         int pushout;
4109
4110         if (dev->nShortOpCaches > 0) {
4111                 /* Try find a non-dirty one... */
4112
4113                 cache = yaffs_GrabChunkCacheWorker(dev);
4114
4115                 if (!cache) {
4116                         /* They were all dirty, find the last recently used object and flush
4117                          * its cache, then  find again.
4118                          * NB what's here is not very accurate, we actually flush the object
4119                          * the last recently used page.
4120                          */
4121
4122                         /* With locking we can't assume we can use entry zero */
4123
4124                         theObj = NULL;
4125                         usage = -1;
4126                         cache = NULL;
4127                         pushout = -1;
4128
4129                         for (i = 0; i < dev->nShortOpCaches; i++) {
4130                                 if (dev->srCache[i].object &&
4131                                     !dev->srCache[i].locked &&
4132                                     (dev->srCache[i].lastUse < usage || !cache)) {
4133                                         usage = dev->srCache[i].lastUse;
4134                                         theObj = dev->srCache[i].object;
4135                                         cache = &dev->srCache[i];
4136                                         pushout = i;
4137                                 }
4138                         }
4139
4140                         if (!cache || cache->dirty) {
4141                                 /* Flush and try again */
4142                                 yaffs_FlushFilesChunkCache(theObj);
4143                                 cache = yaffs_GrabChunkCacheWorker(dev);
4144                         }
4145
4146                 }
4147                 return cache;
4148         } else
4149                 return NULL;
4150
4151 }
4152
4153 /* Find a cached chunk */
4154 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
4155                                               int chunkId)
4156 {
4157         yaffs_Device *dev = obj->myDev;
4158         int i;
4159         if (dev->nShortOpCaches > 0) {
4160                 for (i = 0; i < dev->nShortOpCaches; i++) {
4161                         if (dev->srCache[i].object == obj &&
4162                             dev->srCache[i].chunkId == chunkId) {
4163                                 dev->cacheHits++;
4164
4165                                 return &dev->srCache[i];
4166                         }
4167                 }
4168         }
4169         return NULL;
4170 }
4171
4172 /* Mark the chunk for the least recently used algorithym */
4173 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
4174                                 int isAWrite)
4175 {
4176
4177         if (dev->nShortOpCaches > 0) {
4178                 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
4179                         /* Reset the cache usages */
4180                         int i;
4181                         for (i = 1; i < dev->nShortOpCaches; i++)
4182                                 dev->srCache[i].lastUse = 0;
4183
4184                         dev->srLastUse = 0;
4185                 }
4186
4187                 dev->srLastUse++;
4188
4189                 cache->lastUse = dev->srLastUse;
4190
4191                 if (isAWrite)
4192                         cache->dirty = 1;
4193         }
4194 }
4195
4196 /* Invalidate a single cache page.
4197  * Do this when a whole page gets written,
4198  * ie the short cache for this page is no longer valid.
4199  */
4200 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
4201 {
4202         if (object->myDev->nShortOpCaches > 0) {
4203                 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4204
4205                 if (cache)
4206                         cache->object = NULL;
4207         }
4208 }
4209
4210 /* Invalidate all the cache pages associated with this object
4211  * Do this whenever ther file is deleted or resized.
4212  */
4213 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
4214 {
4215         int i;
4216         yaffs_Device *dev = in->myDev;
4217
4218         if (dev->nShortOpCaches > 0) {
4219                 /* Invalidate it. */
4220                 for (i = 0; i < dev->nShortOpCaches; i++) {
4221                         if (dev->srCache[i].object == in)
4222                                 dev->srCache[i].object = NULL;
4223                 }
4224         }
4225 }
4226
4227 /*--------------------- Checkpointing --------------------*/
4228
4229
4230 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
4231 {
4232         yaffs_CheckpointValidity cp;
4233
4234         memset(&cp, 0, sizeof(cp));
4235
4236         cp.structType = sizeof(cp);
4237         cp.magic = YAFFS_MAGIC;
4238         cp.version = YAFFS_CHECKPOINT_VERSION;
4239         cp.head = (head) ? 1 : 0;
4240
4241         return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
4242                 1 : 0;
4243 }
4244
4245 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4246 {
4247         yaffs_CheckpointValidity cp;
4248         int ok;
4249
4250         ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4251
4252         if (ok)
4253                 ok = (cp.structType == sizeof(cp)) &&
4254                      (cp.magic == YAFFS_MAGIC) &&
4255                      (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4256                      (cp.head == ((head) ? 1 : 0));
4257         return ok ? 1 : 0;
4258 }
4259
4260 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4261                                            yaffs_Device *dev)
4262 {
4263         cp->nErasedBlocks = dev->nErasedBlocks;
4264         cp->allocationBlock = dev->allocationBlock;
4265         cp->allocationPage = dev->allocationPage;
4266         cp->nFreeChunks = dev->nFreeChunks;
4267
4268         cp->nDeletedFiles = dev->nDeletedFiles;
4269         cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4270         cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4271         cp->sequenceNumber = dev->sequenceNumber;
4272         cp->oldestDirtySequence = dev->oldestDirtySequence;
4273
4274 }
4275
4276 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4277                                            yaffs_CheckpointDevice *cp)
4278 {
4279         dev->nErasedBlocks = cp->nErasedBlocks;
4280         dev->allocationBlock = cp->allocationBlock;
4281         dev->allocationPage = cp->allocationPage;
4282         dev->nFreeChunks = cp->nFreeChunks;
4283
4284         dev->nDeletedFiles = cp->nDeletedFiles;
4285         dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4286         dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4287         dev->sequenceNumber = cp->sequenceNumber;
4288         dev->oldestDirtySequence = cp->oldestDirtySequence;
4289 }
4290
4291
4292 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4293 {
4294         yaffs_CheckpointDevice cp;
4295         __u32 nBytes;
4296         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4297
4298         int ok;
4299
4300         /* Write device runtime values*/
4301         yaffs_DeviceToCheckpointDevice(&cp, dev);
4302         cp.structType = sizeof(cp);
4303
4304         ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4305
4306         /* Write block info */
4307         if (ok) {
4308                 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4309                 ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
4310         }
4311
4312         /* Write chunk bits */
4313         if (ok) {
4314                 nBytes = nBlocks * dev->chunkBitmapStride;
4315                 ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
4316         }
4317         return   ok ? 1 : 0;
4318
4319 }
4320
4321 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4322 {
4323         yaffs_CheckpointDevice cp;
4324         __u32 nBytes;
4325         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4326
4327         int ok;
4328
4329         ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4330         if (!ok)
4331                 return 0;
4332
4333         if (cp.structType != sizeof(cp))
4334                 return 0;
4335
4336
4337         yaffs_CheckpointDeviceToDevice(dev, &cp);
4338
4339         nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4340
4341         ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
4342
4343         if (!ok)
4344                 return 0;
4345         nBytes = nBlocks * dev->chunkBitmapStride;
4346
4347         ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
4348
4349         return ok ? 1 : 0;
4350 }
4351
4352 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4353                                            yaffs_Object *obj)
4354 {
4355
4356         cp->objectId = obj->objectId;
4357         cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4358         cp->hdrChunk = obj->hdrChunk;
4359         cp->variantType = obj->variantType;
4360         cp->deleted = obj->deleted;
4361         cp->softDeleted = obj->softDeleted;
4362         cp->unlinked = obj->unlinked;
4363         cp->fake = obj->fake;
4364         cp->renameAllowed = obj->renameAllowed;
4365         cp->unlinkAllowed = obj->unlinkAllowed;
4366         cp->serial = obj->serial;
4367         cp->nDataChunks = obj->nDataChunks;
4368
4369         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4370                 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4371         else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4372                 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4373 }
4374
4375 static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
4376 {
4377
4378         yaffs_Object *parent;
4379
4380         if (obj->variantType != cp->variantType) {
4381                 T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
4382                         TCONT("chunk %d does not match existing object type %d")
4383                         TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
4384                         obj->variantType));
4385                 return 0;
4386         }
4387
4388         obj->objectId = cp->objectId;
4389
4390         if (cp->parentId)
4391                 parent = yaffs_FindOrCreateObjectByNumber(
4392                                         obj->myDev,
4393                                         cp->parentId,
4394                                         YAFFS_OBJECT_TYPE_DIRECTORY);
4395         else
4396                 parent = NULL;
4397
4398         if (parent) {
4399                 if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4400                         T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
4401                                 TCONT(" chunk %d Parent type, %d, not directory")
4402                                 TENDSTR),
4403                                 cp->objectId, cp->parentId, cp->variantType,
4404                                 cp->hdrChunk, parent->variantType));
4405                         return 0;
4406                 }
4407                 yaffs_AddObjectToDirectory(parent, obj);
4408         }
4409
4410         obj->hdrChunk = cp->hdrChunk;
4411         obj->variantType = cp->variantType;
4412         obj->deleted = cp->deleted;
4413         obj->softDeleted = cp->softDeleted;
4414         obj->unlinked = cp->unlinked;
4415         obj->fake = cp->fake;
4416         obj->renameAllowed = cp->renameAllowed;
4417         obj->unlinkAllowed = cp->unlinkAllowed;
4418         obj->serial = cp->serial;
4419         obj->nDataChunks = cp->nDataChunks;
4420
4421         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4422                 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4423         else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4424                 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4425
4426         if (obj->hdrChunk > 0)
4427                 obj->lazyLoaded = 1;
4428         return 1;
4429 }
4430
4431
4432
4433 static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
4434                                         __u32 level, int chunkOffset)
4435 {
4436         int i;
4437         yaffs_Device *dev = in->myDev;
4438         int ok = 1;
4439         int tnodeSize = yaffs_CalcTnodeSize(dev);
4440
4441         if (tn) {
4442                 if (level > 0) {
4443
4444                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
4445                                 if (tn->internal[i]) {
4446                                         ok = yaffs_CheckpointTnodeWorker(in,
4447                                                         tn->internal[i],
4448                                                         level - 1,
4449                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4450                                 }
4451                         }
4452                 } else if (level == 0) {
4453                         __u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
4454                         ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
4455                         if (ok)
4456                                 ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
4457                 }
4458         }
4459
4460         return ok;
4461
4462 }
4463
4464 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4465 {
4466         __u32 endMarker = ~0;
4467         int ok = 1;
4468
4469         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4470                 ok = yaffs_CheckpointTnodeWorker(obj,
4471                                             obj->variant.fileVariant.top,
4472                                             obj->variant.fileVariant.topLevel,
4473                                             0);
4474                 if (ok)
4475                         ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
4476                                 sizeof(endMarker));
4477         }
4478
4479         return ok ? 1 : 0;
4480 }
4481
4482 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4483 {
4484         __u32 baseChunk;
4485         int ok = 1;
4486         yaffs_Device *dev = obj->myDev;
4487         yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4488         yaffs_Tnode *tn;
4489         int nread = 0;
4490         int tnodeSize = yaffs_CalcTnodeSize(dev);
4491
4492         ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4493
4494         while (ok && (~baseChunk)) {
4495                 nread++;
4496                 /* Read level 0 tnode */
4497
4498
4499                 tn = yaffs_GetTnodeRaw(dev);
4500                 if (tn)
4501                         ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
4502                 else
4503                         ok = 0;
4504
4505                 if (tn && ok)
4506                         ok = yaffs_AddOrFindLevel0Tnode(dev,
4507                                                         fileStructPtr,
4508                                                         baseChunk,
4509                                                         tn) ? 1 : 0;
4510
4511                 if (ok)
4512                         ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4513
4514         }
4515
4516         T(YAFFS_TRACE_CHECKPOINT, (
4517                 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4518                 nread, baseChunk, ok));
4519
4520         return ok ? 1 : 0;
4521 }
4522
4523
4524 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4525 {
4526         yaffs_Object *obj;
4527         yaffs_CheckpointObject cp;
4528         int i;
4529         int ok = 1;
4530         struct ylist_head *lh;
4531
4532
4533         /* Iterate through the objects in each hash entry,
4534          * dumping them to the checkpointing stream.
4535          */
4536
4537         for (i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++) {
4538                 ylist_for_each(lh, &dev->objectBucket[i].list) {
4539                         if (lh) {
4540                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
4541                                 if (!obj->deferedFree) {
4542                                         yaffs_ObjectToCheckpointObject(&cp, obj);
4543                                         cp.structType = sizeof(cp);
4544
4545                                         T(YAFFS_TRACE_CHECKPOINT, (
4546                                                 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %p" TENDSTR),
4547                                                 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, obj));
4548
4549                                         ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4550
4551                                         if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4552                                                 ok = yaffs_WriteCheckpointTnodes(obj);
4553                                 }
4554                         }
4555                 }
4556         }
4557
4558         /* Dump end of list */
4559         memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
4560         cp.structType = sizeof(cp);
4561
4562         if (ok)
4563                 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4564
4565         return ok ? 1 : 0;
4566 }
4567
4568 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4569 {
4570         yaffs_Object *obj;
4571         yaffs_CheckpointObject cp;
4572         int ok = 1;
4573         int done = 0;
4574         yaffs_Object *hardList = NULL;
4575
4576         while (ok && !done) {
4577                 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4578                 if (cp.structType != sizeof(cp)) {
4579                         T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
4580                                 cp.structType, (int)sizeof(cp), ok));
4581                         ok = 0;
4582                 }
4583
4584                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4585                         cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
4586
4587                 if (ok && cp.objectId == ~0)
4588                         done = 1;
4589                 else if (ok) {
4590                         obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
4591                         if (obj) {
4592                                 ok = yaffs_CheckpointObjectToObject(obj, &cp);
4593                                 if (!ok)
4594                                         break;
4595                                 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4596                                         ok = yaffs_ReadCheckpointTnodes(obj);
4597                                 } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4598                                         obj->hardLinks.next =
4599                                                 (struct ylist_head *) hardList;
4600                                         hardList = obj;
4601                                 }
4602                         } else
4603                                 ok = 0;
4604                 }
4605         }
4606
4607         if (ok)
4608                 yaffs_HardlinkFixup(dev, hardList);
4609
4610         return ok ? 1 : 0;
4611 }
4612
4613 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4614 {
4615         __u32 checkpointSum;
4616         int ok;
4617
4618         yaffs_GetCheckpointSum(dev, &checkpointSum);
4619
4620         ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
4621
4622         if (!ok)
4623                 return 0;
4624
4625         return 1;
4626 }
4627
4628 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4629 {
4630         __u32 checkpointSum0;
4631         __u32 checkpointSum1;
4632         int ok;
4633
4634         yaffs_GetCheckpointSum(dev, &checkpointSum0);
4635
4636         ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4637
4638         if (!ok)
4639                 return 0;
4640
4641         if (checkpointSum0 != checkpointSum1)
4642                 return 0;
4643
4644         return 1;
4645 }
4646
4647
4648 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4649 {
4650         int ok = 1;
4651
4652         if (dev->skipCheckpointWrite || !dev->isYaffs2) {
4653                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
4654                 ok = 0;
4655         }
4656
4657         if (ok)
4658                 ok = yaffs_CheckpointOpen(dev, 1);
4659
4660         if (ok) {
4661                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4662                 ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
4663         }
4664         if (ok) {
4665                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
4666                 ok = yaffs_WriteCheckpointDevice(dev);
4667         }
4668         if (ok) {
4669                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
4670                 ok = yaffs_WriteCheckpointObjects(dev);
4671         }
4672         if (ok) {
4673                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4674                 ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
4675         }
4676
4677         if (ok)
4678                 ok = yaffs_WriteCheckpointSum(dev);
4679
4680         if (!yaffs_CheckpointClose(dev))
4681                 ok = 0;
4682
4683         if (ok)
4684                 dev->isCheckpointed = 1;
4685         else
4686                 dev->isCheckpointed = 0;
4687
4688         return dev->isCheckpointed;
4689 }
4690
4691 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4692 {
4693         int ok = 1;
4694
4695         if (dev->skipCheckpointRead || !dev->isYaffs2) {
4696                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
4697                 ok = 0;
4698         }
4699
4700         if (ok)
4701                 ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
4702
4703         if (ok) {
4704                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4705                 ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
4706         }
4707         if (ok) {
4708                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
4709                 ok = yaffs_ReadCheckpointDevice(dev);
4710         }
4711         if (ok) {
4712                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
4713                 ok = yaffs_ReadCheckpointObjects(dev);
4714         }
4715         if (ok) {
4716                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4717                 ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
4718         }
4719
4720         if (ok) {
4721                 ok = yaffs_ReadCheckpointSum(dev);
4722                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
4723         }
4724
4725         if (!yaffs_CheckpointClose(dev))
4726                 ok = 0;
4727
4728         if (ok)
4729                 dev->isCheckpointed = 1;
4730         else
4731                 dev->isCheckpointed = 0;
4732
4733         return ok ? 1 : 0;
4734
4735 }
4736
4737 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4738 {
4739         if (dev->isCheckpointed ||
4740                         dev->blocksInCheckpoint > 0) {
4741                 dev->isCheckpointed = 0;
4742                 yaffs_CheckpointInvalidateStream(dev);
4743                 if (dev->superBlock && dev->markSuperBlockDirty)
4744                         dev->markSuperBlockDirty(dev->superBlock);
4745         }
4746 }
4747
4748
4749 int yaffs_CheckpointSave(yaffs_Device *dev)
4750 {
4751
4752         T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4753
4754         yaffs_VerifyObjects(dev);
4755         yaffs_VerifyBlocks(dev);
4756         yaffs_VerifyFreeChunks(dev);
4757
4758         if (!dev->isCheckpointed) {
4759                 yaffs_InvalidateCheckpoint(dev);
4760                 yaffs_WriteCheckpointData(dev);
4761         }
4762
4763         T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4764
4765         return dev->isCheckpointed;
4766 }
4767
4768 int yaffs_CheckpointRestore(yaffs_Device *dev)
4769 {
4770         int retval;
4771         T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4772
4773         retval = yaffs_ReadCheckpointData(dev);
4774
4775         if (dev->isCheckpointed) {
4776                 yaffs_VerifyObjects(dev);
4777                 yaffs_VerifyBlocks(dev);
4778                 yaffs_VerifyFreeChunks(dev);
4779         }
4780
4781         T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4782
4783         return retval;
4784 }
4785
4786 /*--------------------- File read/write ------------------------
4787  * Read and write have very similar structures.
4788  * In general the read/write has three parts to it
4789  * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4790  * Some complete chunks
4791  * An incomplete chunk to end off with
4792  *
4793  * Curve-balls: the first chunk might also be the last chunk.
4794  */
4795
4796 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
4797                         int nBytes)
4798 {
4799
4800         int chunk;
4801         __u32 start;
4802         int nToCopy;
4803         int n = nBytes;
4804         int nDone = 0;
4805         yaffs_ChunkCache *cache;
4806
4807         yaffs_Device *dev;
4808
4809         dev = in->myDev;
4810
4811         while (n > 0) {
4812                 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4813                 /* start = offset % dev->nDataBytesPerChunk; */
4814                 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4815                 chunk++;
4816
4817                 /* OK now check for the curveball where the start and end are in
4818                  * the same chunk.
4819                  */
4820                 if ((start + n) < dev->nDataBytesPerChunk)
4821                         nToCopy = n;
4822                 else
4823                         nToCopy = dev->nDataBytesPerChunk - start;
4824
4825                 cache = yaffs_FindChunkCache(in, chunk);
4826
4827                 /* If the chunk is already in the cache or it is less than a whole chunk
4828                  * or we're using inband tags then use the cache (if there is caching)
4829                  * else bypass the cache.
4830                  */
4831                 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4832                         if (dev->nShortOpCaches > 0) {
4833
4834                                 /* If we can't find the data in the cache, then load it up. */
4835
4836                                 if (!cache) {
4837                                         cache = yaffs_GrabChunkCache(in->myDev);
4838                                         cache->object = in;
4839                                         cache->chunkId = chunk;
4840                                         cache->dirty = 0;
4841                                         cache->locked = 0;
4842                                         yaffs_ReadChunkDataFromObject(in, chunk,
4843                                                                       cache->
4844                                                                       data);
4845                                         cache->nBytes = 0;
4846                                 }
4847
4848                                 yaffs_UseChunkCache(dev, cache, 0);
4849
4850                                 cache->locked = 1;
4851
4852
4853                                 memcpy(buffer, &cache->data[start], nToCopy);
4854
4855                                 cache->locked = 0;
4856                         } else {
4857                                 /* Read into the local buffer then copy..*/
4858
4859                                 __u8 *localBuffer =
4860                                     yaffs_GetTempBuffer(dev, __LINE__);
4861                                 yaffs_ReadChunkDataFromObject(in, chunk,
4862                                                               localBuffer);
4863
4864                                 memcpy(buffer, &localBuffer[start], nToCopy);
4865
4866
4867                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
4868                                                         __LINE__);
4869                         }
4870
4871                 } else {
4872
4873                         /* A full chunk. Read directly into the supplied buffer. */
4874                         yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4875
4876                 }
4877
4878                 n -= nToCopy;
4879                 offset += nToCopy;
4880                 buffer += nToCopy;
4881                 nDone += nToCopy;
4882
4883         }
4884
4885         return nDone;
4886 }
4887
4888 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
4889                         int nBytes, int writeThrough)
4890 {
4891
4892         int chunk;
4893         __u32 start;
4894         int nToCopy;
4895         int n = nBytes;
4896         int nDone = 0;
4897         int nToWriteBack;
4898         int startOfWrite = offset;
4899         int chunkWritten = 0;
4900         __u32 nBytesRead;
4901         __u32 chunkStart;
4902
4903         yaffs_Device *dev;
4904
4905         dev = in->myDev;
4906
4907         while (n > 0 && chunkWritten >= 0) {
4908                 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4909                 /* start = offset % dev->nDataBytesPerChunk; */
4910                 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4911
4912                 if (chunk * dev->nDataBytesPerChunk + start != offset ||
4913                                 start >= dev->nDataBytesPerChunk) {
4914                         T(YAFFS_TRACE_ERROR, (
4915                            TSTR("AddrToChunk of offset %d gives chunk %d start %d"
4916                            TENDSTR),
4917                            (int)offset, chunk, start));
4918                 }
4919                 chunk++;
4920
4921                 /* OK now check for the curveball where the start and end are in
4922                  * the same chunk.
4923                  */
4924
4925                 if ((start + n) < dev->nDataBytesPerChunk) {
4926                         nToCopy = n;
4927
4928                         /* Now folks, to calculate how many bytes to write back....
4929                          * If we're overwriting and not writing to then end of file then
4930                          * we need to write back as much as was there before.
4931                          */
4932
4933                         chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
4934
4935                         if (chunkStart > in->variant.fileVariant.fileSize)
4936                                 nBytesRead = 0; /* Past end of file */
4937                         else
4938                                 nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
4939
4940                         if (nBytesRead > dev->nDataBytesPerChunk)
4941                                 nBytesRead = dev->nDataBytesPerChunk;
4942
4943                         nToWriteBack =
4944                             (nBytesRead >
4945                              (start + n)) ? nBytesRead : (start + n);
4946
4947                         if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
4948                                 YBUG();
4949
4950                 } else {
4951                         nToCopy = dev->nDataBytesPerChunk - start;
4952                         nToWriteBack = dev->nDataBytesPerChunk;
4953                 }
4954
4955                 if (nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4956                         /* An incomplete start or end chunk (or maybe both start and end chunk),
4957                          * or we're using inband tags, so we want to use the cache buffers.
4958                          */
4959                         if (dev->nShortOpCaches > 0) {
4960                                 yaffs_ChunkCache *cache;
4961                                 /* If we can't find the data in the cache, then load the cache */
4962                                 cache = yaffs_FindChunkCache(in, chunk);
4963
4964                                 if (!cache
4965                                     && yaffs_CheckSpaceForAllocation(in->
4966                                                                      myDev)) {
4967                                         cache = yaffs_GrabChunkCache(in->myDev);
4968                                         cache->object = in;
4969                                         cache->chunkId = chunk;
4970                                         cache->dirty = 0;
4971                                         cache->locked = 0;
4972                                         yaffs_ReadChunkDataFromObject(in, chunk,
4973                                                                       cache->
4974                                                                       data);
4975                                 } else if (cache &&
4976                                         !cache->dirty &&
4977                                         !yaffs_CheckSpaceForAllocation(in->myDev)) {
4978                                         /* Drop the cache if it was a read cache item and
4979                                          * no space check has been made for it.
4980                                          */
4981                                          cache = NULL;
4982                                 }
4983
4984                                 if (cache) {
4985                                         yaffs_UseChunkCache(dev, cache, 1);
4986                                         cache->locked = 1;
4987
4988
4989                                         memcpy(&cache->data[start], buffer,
4990                                                nToCopy);
4991
4992
4993                                         cache->locked = 0;
4994                                         cache->nBytes = nToWriteBack;
4995
4996                                         if (writeThrough) {
4997                                                 chunkWritten =
4998                                                     yaffs_WriteChunkDataToObject
4999                                                     (cache->object,
5000                                                      cache->chunkId,
5001                                                      cache->data, cache->nBytes,
5002                                                      1);
5003                                                 cache->dirty = 0;
5004                                         }
5005
5006                                 } else {
5007                                         chunkWritten = -1;      /* fail the write */
5008                                 }
5009                         } else {
5010                                 /* An incomplete start or end chunk (or maybe both start and end chunk)
5011                                  * Read into the local buffer then copy, then copy over and write back.
5012                                  */
5013
5014                                 __u8 *localBuffer =
5015                                     yaffs_GetTempBuffer(dev, __LINE__);
5016
5017                                 yaffs_ReadChunkDataFromObject(in, chunk,
5018                                                               localBuffer);
5019
5020
5021
5022                                 memcpy(&localBuffer[start], buffer, nToCopy);
5023
5024                                 chunkWritten =
5025                                     yaffs_WriteChunkDataToObject(in, chunk,
5026                                                                  localBuffer,
5027                                                                  nToWriteBack,
5028                                                                  0);
5029
5030                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
5031                                                         __LINE__);
5032
5033                         }
5034
5035                 } else {
5036                         /* A full chunk. Write directly from the supplied buffer. */
5037
5038
5039
5040                         chunkWritten =
5041                             yaffs_WriteChunkDataToObject(in, chunk, buffer,
5042                                                          dev->nDataBytesPerChunk,
5043                                                          0);
5044
5045                         /* Since we've overwritten the cached data, we better invalidate it. */
5046                         yaffs_InvalidateChunkCache(in, chunk);
5047                 }
5048
5049                 if (chunkWritten >= 0) {
5050                         n -= nToCopy;
5051                         offset += nToCopy;
5052                         buffer += nToCopy;
5053                         nDone += nToCopy;
5054                 }
5055
5056         }
5057
5058         /* Update file object */
5059
5060         if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
5061                 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
5062
5063         in->dirty = 1;
5064
5065         return nDone;
5066 }
5067
5068
5069 /* ---------------------- File resizing stuff ------------------ */
5070
5071 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
5072 {
5073
5074         yaffs_Device *dev = in->myDev;
5075         int oldFileSize = in->variant.fileVariant.fileSize;
5076
5077         int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
5078
5079         int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
5080             dev->nDataBytesPerChunk;
5081         int i;
5082         int chunkId;
5083
5084         /* Delete backwards so that we don't end up with holes if
5085          * power is lost part-way through the operation.
5086          */
5087         for (i = lastDel; i >= startDel; i--) {
5088                 /* NB this could be optimised somewhat,
5089                  * eg. could retrieve the tags and write them without
5090                  * using yaffs_DeleteChunk
5091                  */
5092
5093                 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
5094                 if (chunkId > 0) {
5095                         if (chunkId <
5096                             (dev->internalStartBlock * dev->nChunksPerBlock)
5097                             || chunkId >=
5098                             ((dev->internalEndBlock +
5099                               1) * dev->nChunksPerBlock)) {
5100                                 T(YAFFS_TRACE_ALWAYS,
5101                                   (TSTR("Found daft chunkId %d for %d" TENDSTR),
5102                                    chunkId, i));
5103                         } else {
5104                                 in->nDataChunks--;
5105                                 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
5106                         }
5107                 }
5108         }
5109
5110 }
5111
5112 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
5113 {
5114
5115         int oldFileSize = in->variant.fileVariant.fileSize;
5116         __u32 newSizeOfPartialChunk;
5117         int newFullChunks;
5118
5119         yaffs_Device *dev = in->myDev;
5120
5121         yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
5122
5123         yaffs_FlushFilesChunkCache(in);
5124         yaffs_InvalidateWholeChunkCache(in);
5125
5126         yaffs_CheckGarbageCollection(dev);
5127
5128         if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
5129                 return YAFFS_FAIL;
5130
5131         if (newSize == oldFileSize)
5132                 return YAFFS_OK;
5133
5134         if (newSize < oldFileSize) {
5135
5136                 yaffs_PruneResizedChunks(in, newSize);
5137
5138                 if (newSizeOfPartialChunk != 0) {
5139                         int lastChunk = 1 + newFullChunks;
5140
5141                         __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
5142
5143                         /* Got to read and rewrite the last chunk with its new size and zero pad */
5144                         yaffs_ReadChunkDataFromObject(in, lastChunk,
5145                                                       localBuffer);
5146
5147                         memset(localBuffer + newSizeOfPartialChunk, 0,
5148                                dev->nDataBytesPerChunk - newSizeOfPartialChunk);
5149
5150                         yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
5151                                                      newSizeOfPartialChunk, 1);
5152
5153                         yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
5154                 }
5155
5156                 in->variant.fileVariant.fileSize = newSize;
5157
5158                 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
5159         } else {
5160                 /* newsSize > oldFileSize */
5161                 in->variant.fileVariant.fileSize = newSize;
5162         }
5163
5164
5165         /* Write a new object header to reflect the resize.
5166          * show we've shrunk the file, if need be
5167          * Do this only if the file is not in the deleted directories
5168          * and is not shadowed.
5169          */
5170         if (in->parent &&
5171             !in->isShadowed &&
5172             in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5173             in->parent->objectId != YAFFS_OBJECTID_DELETED)
5174                 yaffs_UpdateObjectHeader(in, NULL, 0,
5175                                          (newSize < oldFileSize) ? 1 : 0, 0);
5176
5177         return YAFFS_OK;
5178 }
5179
5180 loff_t yaffs_GetFileSize(yaffs_Object *obj)
5181 {
5182         YCHAR *alias = NULL;
5183         obj = yaffs_GetEquivalentObject(obj);
5184
5185         switch (obj->variantType) {
5186         case YAFFS_OBJECT_TYPE_FILE:
5187                 return obj->variant.fileVariant.fileSize;
5188         case YAFFS_OBJECT_TYPE_SYMLINK:
5189                 alias = obj->variant.symLinkVariant.alias;
5190                 if(!alias)
5191                         return 0;
5192                 return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
5193         default:
5194                 return 0;
5195         }
5196 }
5197
5198
5199
5200 int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
5201 {
5202         int retVal;
5203         if (in->dirty) {
5204                 yaffs_FlushFilesChunkCache(in);
5205                 if(dataSync) /* Only sync data */
5206                         retVal=YAFFS_OK;
5207                 else {
5208                         if (updateTime) {
5209 #ifdef CONFIG_YAFFS_WINCE
5210                                 yfsd_WinFileTimeNow(in->win_mtime);
5211 #else
5212
5213                                 in->yst_mtime = Y_CURRENT_TIME;
5214
5215 #endif
5216                         }
5217
5218                         retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5219                                 0) ? YAFFS_OK : YAFFS_FAIL;
5220                 }
5221         } else {
5222                 retVal = YAFFS_OK;
5223         }
5224
5225         return retVal;
5226
5227 }
5228
5229 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
5230 {
5231
5232         /* First off, invalidate the file's data in the cache, without flushing. */
5233         yaffs_InvalidateWholeChunkCache(in);
5234
5235         if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5236                 /* Move to the unlinked directory so we have a record that it was deleted. */
5237                 yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
5238
5239         }
5240
5241         yaffs_RemoveObjectFromDirectory(in);
5242         yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
5243         in->hdrChunk = 0;
5244
5245         yaffs_FreeObject(in);
5246         return YAFFS_OK;
5247
5248 }
5249
5250 /* yaffs_DeleteFile deletes the whole file data
5251  * and the inode associated with the file.
5252  * It does not delete the links associated with the file.
5253  */
5254 static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
5255 {
5256
5257         int retVal;
5258         int immediateDeletion = 0;
5259
5260         if (!in->myInode)
5261                 immediateDeletion = 1;
5262
5263         if (immediateDeletion) {
5264                 retVal =
5265                     yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5266                                            _Y("deleted"), 0, 0);
5267                 T(YAFFS_TRACE_TRACING,
5268                   (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5269                    in->objectId));
5270                 in->deleted = 1;
5271                 in->myDev->nDeletedFiles++;
5272                 if (1 || in->myDev->isYaffs2)
5273                         yaffs_ResizeFile(in, 0);
5274                 yaffs_SoftDeleteFile(in);
5275         } else {
5276                 retVal =
5277                     yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5278                                            _Y("unlinked"), 0, 0);
5279         }
5280
5281
5282         return retVal;
5283 }
5284
5285 int yaffs_DeleteFile(yaffs_Object *in)
5286 {
5287         int retVal = YAFFS_OK;
5288         int deleted = in->deleted;
5289
5290         yaffs_ResizeFile(in, 0);
5291
5292         if (in->nDataChunks > 0) {
5293                 /* Use soft deletion if there is data in the file.
5294                  * That won't be the case if it has been resized to zero.
5295                  */
5296                 if (!in->unlinked)
5297                         retVal = yaffs_UnlinkFileIfNeeded(in);
5298
5299                 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5300                         in->deleted = 1;
5301                         deleted = 1;
5302                         in->myDev->nDeletedFiles++;
5303                         yaffs_SoftDeleteFile(in);
5304                 }
5305                 return deleted ? YAFFS_OK : YAFFS_FAIL;
5306         } else {
5307                 /* The file has no data chunks so we toss it immediately */
5308                 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5309                 in->variant.fileVariant.top = NULL;
5310                 yaffs_DoGenericObjectDeletion(in);
5311
5312                 return YAFFS_OK;
5313         }
5314 }
5315
5316 static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
5317 {
5318         return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
5319                 !(ylist_empty(&obj->variant.directoryVariant.children));
5320 }
5321
5322 static int yaffs_DeleteDirectory(yaffs_Object *obj)
5323 {
5324         /* First check that the directory is empty. */
5325         if (yaffs_IsNonEmptyDirectory(obj))
5326                 return YAFFS_FAIL;
5327
5328         return yaffs_DoGenericObjectDeletion(obj);
5329 }
5330
5331 static int yaffs_DeleteSymLink(yaffs_Object *in)
5332 {
5333         if(in->variant.symLinkVariant.alias)
5334                 YFREE(in->variant.symLinkVariant.alias);
5335         in->variant.symLinkVariant.alias=NULL;
5336
5337         return yaffs_DoGenericObjectDeletion(in);
5338 }
5339
5340 static int yaffs_DeleteHardLink(yaffs_Object *in)
5341 {
5342         /* remove this hardlink from the list assocaited with the equivalent
5343          * object
5344          */
5345         ylist_del_init(&in->hardLinks);
5346         return yaffs_DoGenericObjectDeletion(in);
5347 }
5348
5349 int yaffs_DeleteObject(yaffs_Object *obj)
5350 {
5351 int retVal = -1;
5352         switch (obj->variantType) {
5353         case YAFFS_OBJECT_TYPE_FILE:
5354                 retVal = yaffs_DeleteFile(obj);
5355                 break;
5356         case YAFFS_OBJECT_TYPE_DIRECTORY:
5357                 return yaffs_DeleteDirectory(obj);
5358                 break;
5359         case YAFFS_OBJECT_TYPE_SYMLINK:
5360                 retVal = yaffs_DeleteSymLink(obj);
5361                 break;
5362         case YAFFS_OBJECT_TYPE_HARDLINK:
5363                 retVal = yaffs_DeleteHardLink(obj);
5364                 break;
5365         case YAFFS_OBJECT_TYPE_SPECIAL:
5366                 retVal = yaffs_DoGenericObjectDeletion(obj);
5367                 break;
5368         case YAFFS_OBJECT_TYPE_UNKNOWN:
5369                 retVal = 0;
5370                 break;          /* should not happen. */
5371         }
5372
5373         return retVal;
5374 }
5375
5376 static int yaffs_UnlinkWorker(yaffs_Object *obj)
5377 {
5378
5379         int immediateDeletion = 0;
5380
5381         if (!obj->myInode)
5382                 immediateDeletion = 1;
5383
5384         if(obj)
5385                 yaffs_UpdateParent(obj->parent);
5386
5387         if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5388                 return yaffs_DeleteHardLink(obj);
5389         } else if (!ylist_empty(&obj->hardLinks)) {
5390                 /* Curve ball: We're unlinking an object that has a hardlink.
5391                  *
5392                  * This problem arises because we are not strictly following
5393                  * The Linux link/inode model.
5394                  *
5395                  * We can't really delete the object.
5396                  * Instead, we do the following:
5397                  * - Select a hardlink.
5398                  * - Unhook it from the hard links
5399                  * - Move it from its parent directory (so that the rename can work)
5400                  * - Rename the object to the hardlink's name.
5401                  * - Delete the hardlink
5402                  */
5403
5404                 yaffs_Object *hl;
5405                 yaffs_Object *parent;
5406                 int retVal;
5407                 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5408
5409                 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5410
5411                 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5412                 parent = hl->parent;
5413
5414                 ylist_del_init(&hl->hardLinks);
5415
5416                 yaffs_AddObjectToDirectory(obj->myDev->unlinkedDir, hl);
5417
5418                 retVal = yaffs_ChangeObjectName(obj,parent, name, 0, 0);
5419
5420                 if (retVal == YAFFS_OK)
5421                         retVal = yaffs_DoGenericObjectDeletion(hl);
5422
5423                 return retVal;
5424
5425         } else if (immediateDeletion) {
5426                 switch (obj->variantType) {
5427                 case YAFFS_OBJECT_TYPE_FILE:
5428                         return yaffs_DeleteFile(obj);
5429                         break;
5430                 case YAFFS_OBJECT_TYPE_DIRECTORY:
5431                         return yaffs_DeleteDirectory(obj);
5432                         break;
5433                 case YAFFS_OBJECT_TYPE_SYMLINK:
5434                         return yaffs_DeleteSymLink(obj);
5435                         break;
5436                 case YAFFS_OBJECT_TYPE_SPECIAL:
5437                         return yaffs_DoGenericObjectDeletion(obj);
5438                         break;
5439                 case YAFFS_OBJECT_TYPE_HARDLINK:
5440                 case YAFFS_OBJECT_TYPE_UNKNOWN:
5441                 default:
5442                         return YAFFS_FAIL;
5443                 }
5444         } else if(yaffs_IsNonEmptyDirectory(obj))
5445                 return YAFFS_FAIL;
5446         else
5447                 return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
5448                                            _Y("unlinked"), 0, 0);
5449 }
5450
5451
5452 static int yaffs_UnlinkObject(yaffs_Object *obj)
5453 {
5454
5455         if (obj && obj->unlinkAllowed)
5456                 return yaffs_UnlinkWorker(obj);
5457
5458         return YAFFS_FAIL;
5459
5460 }
5461 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
5462 {
5463         yaffs_Object *obj;
5464
5465         obj = yaffs_FindObjectByName(dir, name);
5466         return yaffs_UnlinkObject(obj);
5467 }
5468
5469 /*----------------------- Initialisation Scanning ---------------------- */
5470
5471 static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
5472                                 int backwardScanning)
5473 {
5474         yaffs_Object *obj;
5475
5476         if (!backwardScanning) {
5477                 /* Handle YAFFS1 forward scanning case
5478                  * For YAFFS1 we always do the deletion
5479                  */
5480
5481         } else {
5482                 /* Handle YAFFS2 case (backward scanning)
5483                  * If the shadowed object exists then ignore.
5484                  */
5485                 obj = yaffs_FindObjectByNumber(dev, objId);
5486                 if(obj)
5487                         return;
5488         }
5489
5490         /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5491          * We put it in unlinked dir to be cleaned up after the scanning
5492          */
5493         obj =
5494             yaffs_FindOrCreateObjectByNumber(dev, objId,
5495                                              YAFFS_OBJECT_TYPE_FILE);
5496         if (!obj)
5497                 return;
5498         obj->isShadowed = 1;
5499         yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5500         obj->variant.fileVariant.shrinkSize = 0;
5501         obj->valid = 1;         /* So that we don't read any other info for this file */
5502
5503 }
5504
5505 typedef struct {
5506         int seq;
5507         int block;
5508 } yaffs_BlockIndex;
5509
5510
5511 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5512 {
5513         yaffs_Object *hl;
5514         yaffs_Object *in;
5515
5516         while (hardList) {
5517                 hl = hardList;
5518                 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5519
5520                 in = yaffs_FindObjectByNumber(dev,
5521                                               hl->variant.hardLinkVariant.
5522                                               equivalentObjectId);
5523
5524                 if (in) {
5525                         /* Add the hardlink pointers */
5526                         hl->variant.hardLinkVariant.equivalentObject = in;
5527                         ylist_add(&hl->hardLinks, &in->hardLinks);
5528                 } else {
5529                         /* Todo Need to report/handle this better.
5530                          * Got a problem... hardlink to a non-existant object
5531                          */
5532                         hl->variant.hardLinkVariant.equivalentObject = NULL;
5533                         YINIT_LIST_HEAD(&hl->hardLinks);
5534
5535                 }
5536         }
5537 }
5538
5539
5540
5541
5542
5543 static int ybicmp(const void *a, const void *b)
5544 {
5545         register int aseq = ((yaffs_BlockIndex *)a)->seq;
5546         register int bseq = ((yaffs_BlockIndex *)b)->seq;
5547         register int ablock = ((yaffs_BlockIndex *)a)->block;
5548         register int bblock = ((yaffs_BlockIndex *)b)->block;
5549         if (aseq == bseq)
5550                 return ablock - bblock;
5551         else
5552                 return aseq - bseq;
5553 }
5554
5555
5556 struct yaffs_ShadowFixerStruct {
5557         int objectId;
5558         int shadowedId;
5559         struct yaffs_ShadowFixerStruct *next;
5560 };
5561
5562
5563 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
5564 {
5565         /*
5566         *  Sort out state of unlinked and deleted objects after scanning.
5567         */
5568         struct ylist_head *i;
5569         struct ylist_head *n;
5570         yaffs_Object *l;
5571
5572         /* Soft delete all the unlinked files */
5573         ylist_for_each_safe(i, n,
5574                 &dev->unlinkedDir->variant.directoryVariant.children) {
5575                 if (i) {
5576                         l = ylist_entry(i, yaffs_Object, siblings);
5577                         yaffs_DeleteObject(l);
5578                 }
5579         }
5580
5581         ylist_for_each_safe(i, n,
5582                 &dev->deletedDir->variant.directoryVariant.children) {
5583                 if (i) {
5584                         l = ylist_entry(i, yaffs_Object, siblings);
5585                         yaffs_DeleteObject(l);
5586                 }
5587         }
5588
5589 }
5590
5591 /*
5592  * This code iterates through all the objects making sure that they are rooted.
5593  * Any unrooted objects are re-rooted in lost+found.
5594  * An object needs to be in one of:
5595  * - Directly under deleted, unlinked
5596  * - Directly or indirectly under root.
5597  *
5598  * Note:
5599  *  This code assumes that we don't ever change the current relationships between
5600  *  directories:
5601  *   rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL
5602  *   lostNfound->parent == rootDir
5603  *
5604  * This fixes the problem where directories might have inadvertently been deleted
5605  * leaving the object "hanging" without being rooted in the directory tree.
5606  */
5607
5608 static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj)
5609 {
5610         return (obj == dev->deletedDir ||
5611                 obj == dev->unlinkedDir||
5612                 obj == dev->rootDir);
5613 }
5614
5615 static void yaffs_FixHangingObjects(yaffs_Device *dev)
5616 {
5617         yaffs_Object *obj;
5618         yaffs_Object *parent;
5619         int i;
5620         struct ylist_head *lh;
5621         struct ylist_head *n;
5622         int depthLimit;
5623         int hanging;
5624
5625
5626         /* Iterate through the objects in each hash entry,
5627          * looking at each object.
5628          * Make sure it is rooted.
5629          */
5630
5631         for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
5632                 ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) {
5633                         if (lh) {
5634                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
5635                                 parent= obj->parent;
5636
5637                                 if(yaffs_HasNULLParent(dev,obj)){
5638                                         /* These directories are not hanging */
5639                                         hanging = 0;
5640                                 }
5641                                 else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5642                                         hanging = 1;
5643                                 else if(yaffs_HasNULLParent(dev,parent))
5644                                         hanging = 0;
5645                                 else {
5646                                         /*
5647                                          * Need to follow the parent chain to see if it is hanging.
5648                                          */
5649                                         hanging = 0;
5650                                         depthLimit=100;
5651
5652                                         while(parent != dev->rootDir &&
5653                                                 parent->parent &&
5654                                                 parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
5655                                                 depthLimit > 0){
5656                                                 parent = parent->parent;
5657                                                 depthLimit--;
5658                                         }
5659                                         if(parent != dev->rootDir)
5660                                                 hanging = 1;
5661                                 }
5662                                 if(hanging){
5663                                         T(YAFFS_TRACE_SCAN,
5664                                           (TSTR("Hanging object %d moved to lost and found" TENDSTR),
5665                                                 obj->objectId));
5666                                         yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj);
5667                                 }
5668                         }
5669                 }
5670         }
5671 }
5672
5673
5674 /*
5675  * Delete directory contents for cleaning up lost and found.
5676  */
5677 static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
5678 {
5679         yaffs_Object *obj;
5680         struct ylist_head *lh;
5681         struct ylist_head *n;
5682
5683         if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5684                 YBUG();
5685
5686         ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) {
5687                 if (lh) {
5688                         obj = ylist_entry(lh, yaffs_Object, siblings);
5689                         if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
5690                                 yaffs_DeleteDirectoryContents(obj);
5691
5692                         T(YAFFS_TRACE_SCAN,
5693                                 (TSTR("Deleting lost_found object %d" TENDSTR),
5694                                 obj->objectId));
5695
5696                         /* Need to use UnlinkObject since Delete would not handle
5697                          * hardlinked objects correctly.
5698                          */
5699                         yaffs_UnlinkObject(obj);
5700                 }
5701         }
5702
5703 }
5704
5705 static void yaffs_EmptyLostAndFound(yaffs_Device *dev)
5706 {
5707         yaffs_DeleteDirectoryContents(dev->lostNFoundDir);
5708 }
5709
5710 static int yaffs_Scan(yaffs_Device *dev)
5711 {
5712         yaffs_ExtendedTags tags;
5713         int blk;
5714         int blockIterator;
5715         int startIterator;
5716         int endIterator;
5717         int result;
5718
5719         int chunk;
5720         int c;
5721         int deleted;
5722         yaffs_BlockState state;
5723         yaffs_Object *hardList = NULL;
5724         yaffs_BlockInfo *bi;
5725         __u32 sequenceNumber;
5726         yaffs_ObjectHeader *oh;
5727         yaffs_Object *in;
5728         yaffs_Object *parent;
5729
5730         int alloc_failed = 0;
5731
5732         struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
5733
5734
5735         __u8 *chunkData;
5736
5737
5738
5739         T(YAFFS_TRACE_SCAN,
5740           (TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
5741            dev->internalStartBlock, dev->internalEndBlock));
5742
5743         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5744
5745         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5746
5747         /* Scan all the blocks to determine their state */
5748         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5749                 bi = yaffs_GetBlockInfo(dev, blk);
5750                 yaffs_ClearChunkBits(dev, blk);
5751                 bi->pagesInUse = 0;
5752                 bi->softDeletions = 0;
5753
5754                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5755
5756                 bi->blockState = state;
5757                 bi->sequenceNumber = sequenceNumber;
5758
5759                 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
5760                         bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
5761
5762                 T(YAFFS_TRACE_SCAN_DEBUG,
5763                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5764                    state, sequenceNumber));
5765
5766                 if (state == YAFFS_BLOCK_STATE_DEAD) {
5767                         T(YAFFS_TRACE_BAD_BLOCKS,
5768                           (TSTR("block %d is bad" TENDSTR), blk));
5769                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5770                         T(YAFFS_TRACE_SCAN_DEBUG,
5771                           (TSTR("Block empty " TENDSTR)));
5772                         dev->nErasedBlocks++;
5773                         dev->nFreeChunks += dev->nChunksPerBlock;
5774                 }
5775         }
5776
5777         startIterator = dev->internalStartBlock;
5778         endIterator = dev->internalEndBlock;
5779
5780         /* For each block.... */
5781         for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5782              blockIterator++) {
5783
5784                 YYIELD();
5785
5786                 YYIELD();
5787
5788                 blk = blockIterator;
5789
5790                 bi = yaffs_GetBlockInfo(dev, blk);
5791                 state = bi->blockState;
5792
5793                 deleted = 0;
5794
5795                 /* For each chunk in each block that needs scanning....*/
5796                 for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
5797                      state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5798                         /* Read the tags and decide what to do */
5799                         chunk = blk * dev->nChunksPerBlock + c;
5800
5801                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5802                                                         &tags);
5803
5804                         /* Let's have a good look at this chunk... */
5805
5806                         if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
5807                                 /* YAFFS1 only...
5808                                  * A deleted chunk
5809                                  */
5810                                 deleted++;
5811                                 dev->nFreeChunks++;
5812                                 /*T((" %d %d deleted\n",blk,c)); */
5813                         } else if (!tags.chunkUsed) {
5814                                 /* An unassigned chunk in the block
5815                                  * This means that either the block is empty or
5816                                  * this is the one being allocated from
5817                                  */
5818
5819                                 if (c == 0) {
5820                                         /* We're looking at the first chunk in the block so the block is unused */
5821                                         state = YAFFS_BLOCK_STATE_EMPTY;
5822                                         dev->nErasedBlocks++;
5823                                 } else {
5824                                         /* this is the block being allocated from */
5825                                         T(YAFFS_TRACE_SCAN,
5826                                           (TSTR
5827                                            (" Allocating from %d %d" TENDSTR),
5828                                            blk, c));
5829                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
5830                                         dev->allocationBlock = blk;
5831                                         dev->allocationPage = c;
5832                                         dev->allocationBlockFinder = blk;
5833                                         /* Set block finder here to encourage the allocator to go forth from here. */
5834
5835                                 }
5836
5837                                 dev->nFreeChunks += (dev->nChunksPerBlock - c);
5838                         } else if (tags.chunkId > 0) {
5839                                 /* chunkId > 0 so it is a data chunk... */
5840                                 unsigned int endpos;
5841
5842                                 yaffs_SetChunkBit(dev, blk, c);
5843                                 bi->pagesInUse++;
5844
5845                                 in = yaffs_FindOrCreateObjectByNumber(dev,
5846                                                                       tags.
5847                                                                       objectId,
5848                                                                       YAFFS_OBJECT_TYPE_FILE);
5849                                 /* PutChunkIntoFile checks for a clash (two data chunks with
5850                                  * the same chunkId).
5851                                  */
5852
5853                                 if (!in)
5854                                         alloc_failed = 1;
5855
5856                                 if (in) {
5857                                         if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
5858                                                 alloc_failed = 1;
5859                                 }
5860
5861                                 endpos =
5862                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5863                                     tags.byteCount;
5864                                 if (in &&
5865                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
5866                                     && in->variant.fileVariant.scannedFileSize <
5867                                     endpos) {
5868                                         in->variant.fileVariant.
5869                                             scannedFileSize = endpos;
5870                                         if (!dev->useHeaderFileSize) {
5871                                                 in->variant.fileVariant.
5872                                                     fileSize =
5873                                                     in->variant.fileVariant.
5874                                                     scannedFileSize;
5875                                         }
5876
5877                                 }
5878                                 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
5879                         } else {
5880                                 /* chunkId == 0, so it is an ObjectHeader.
5881                                  * Thus, we read in the object header and make the object
5882                                  */
5883                                 yaffs_SetChunkBit(dev, blk, c);
5884                                 bi->pagesInUse++;
5885
5886                                 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
5887                                                                 chunkData,
5888                                                                 NULL);
5889
5890                                 oh = (yaffs_ObjectHeader *) chunkData;
5891
5892                                 in = yaffs_FindObjectByNumber(dev,
5893                                                               tags.objectId);
5894                                 if (in && in->variantType != oh->type) {
5895                                         /* This should not happen, but somehow
5896                                          * Wev'e ended up with an objectId that has been reused but not yet
5897                                          * deleted, and worse still it has changed type. Delete the old object.
5898                                          */
5899
5900                                         yaffs_DeleteObject(in);
5901
5902                                         in = 0;
5903                                 }
5904
5905                                 in = yaffs_FindOrCreateObjectByNumber(dev,
5906                                                                       tags.
5907                                                                       objectId,
5908                                                                       oh->type);
5909
5910                                 if (!in)
5911                                         alloc_failed = 1;
5912
5913                                 if (in && oh->shadowsObject > 0) {
5914
5915                                         struct yaffs_ShadowFixerStruct *fixer;
5916                                         fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
5917                                         if (fixer) {
5918                                                 fixer->next = shadowFixerList;
5919                                                 shadowFixerList = fixer;
5920                                                 fixer->objectId = tags.objectId;
5921                                                 fixer->shadowedId = oh->shadowsObject;
5922                                         }
5923
5924                                 }
5925
5926                                 if (in && in->valid) {
5927                                         /* We have already filled this one. We have a duplicate and need to resolve it. */
5928
5929                                         unsigned existingSerial = in->serial;
5930                                         unsigned newSerial = tags.serialNumber;
5931
5932                                         if (((existingSerial + 1) & 3) == newSerial) {
5933                                                 /* Use new one - destroy the exisiting one */
5934                                                 yaffs_DeleteChunk(dev,
5935                                                                   in->hdrChunk,
5936                                                                   1, __LINE__);
5937                                                 in->valid = 0;
5938                                         } else {
5939                                                 /* Use existing - destroy this one. */
5940                                                 yaffs_DeleteChunk(dev, chunk, 1,
5941                                                                   __LINE__);
5942                                         }
5943                                 }
5944
5945                                 if (in && !in->valid &&
5946                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
5947                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
5948                                         /* We only load some info, don't fiddle with directory structure */
5949                                         in->valid = 1;
5950                                         in->variantType = oh->type;
5951
5952                                         in->yst_mode = oh->yst_mode;
5953 #ifdef CONFIG_YAFFS_WINCE
5954                                         in->win_atime[0] = oh->win_atime[0];
5955                                         in->win_ctime[0] = oh->win_ctime[0];
5956                                         in->win_mtime[0] = oh->win_mtime[0];
5957                                         in->win_atime[1] = oh->win_atime[1];
5958                                         in->win_ctime[1] = oh->win_ctime[1];
5959                                         in->win_mtime[1] = oh->win_mtime[1];
5960 #else
5961                                         in->yst_uid = oh->yst_uid;
5962                                         in->yst_gid = oh->yst_gid;
5963                                         in->yst_atime = oh->yst_atime;
5964                                         in->yst_mtime = oh->yst_mtime;
5965                                         in->yst_ctime = oh->yst_ctime;
5966                                         in->yst_rdev = oh->yst_rdev;
5967 #endif
5968                                         in->hdrChunk = chunk;
5969                                         in->serial = tags.serialNumber;
5970
5971                                 } else if (in && !in->valid) {
5972                                         /* we need to load this info */
5973
5974                                         in->valid = 1;
5975                                         in->variantType = oh->type;
5976
5977                                         in->yst_mode = oh->yst_mode;
5978 #ifdef CONFIG_YAFFS_WINCE
5979                                         in->win_atime[0] = oh->win_atime[0];
5980                                         in->win_ctime[0] = oh->win_ctime[0];
5981                                         in->win_mtime[0] = oh->win_mtime[0];
5982                                         in->win_atime[1] = oh->win_atime[1];
5983                                         in->win_ctime[1] = oh->win_ctime[1];
5984                                         in->win_mtime[1] = oh->win_mtime[1];
5985 #else
5986                                         in->yst_uid = oh->yst_uid;
5987                                         in->yst_gid = oh->yst_gid;
5988                                         in->yst_atime = oh->yst_atime;
5989                                         in->yst_mtime = oh->yst_mtime;
5990                                         in->yst_ctime = oh->yst_ctime;
5991                                         in->yst_rdev = oh->yst_rdev;
5992 #endif
5993                                         in->hdrChunk = chunk;
5994                                         in->serial = tags.serialNumber;
5995
5996                                         yaffs_SetObjectName(in, oh->name);
5997                                         in->dirty = 0;
5998
5999                                         /* directory stuff...
6000                                          * hook up to parent
6001                                          */
6002
6003                                         parent =
6004                                             yaffs_FindOrCreateObjectByNumber
6005                                             (dev, oh->parentObjectId,
6006                                              YAFFS_OBJECT_TYPE_DIRECTORY);
6007                                         if (!parent)
6008                                                 alloc_failed = 1;
6009                                         if (parent && parent->variantType ==
6010                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
6011                                                 /* Set up as a directory */
6012                                                 parent->variantType =
6013                                                         YAFFS_OBJECT_TYPE_DIRECTORY;
6014                                                 YINIT_LIST_HEAD(&parent->variant.
6015                                                                 directoryVariant.
6016                                                                 children);
6017                                         } else if (!parent || parent->variantType !=
6018                                                    YAFFS_OBJECT_TYPE_DIRECTORY) {
6019                                                 /* Hoosterman, another problem....
6020                                                  * We're trying to use a non-directory as a directory
6021                                                  */
6022
6023                                                 T(YAFFS_TRACE_ERROR,
6024                                                   (TSTR
6025                                                    ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6026                                                     TENDSTR)));
6027                                                 parent = dev->lostNFoundDir;
6028                                         }
6029
6030                                         yaffs_AddObjectToDirectory(parent, in);
6031
6032                                         if (0 && (parent == dev->deletedDir ||
6033                                                   parent == dev->unlinkedDir)) {
6034                                                 in->deleted = 1;        /* If it is unlinked at start up then it wants deleting */
6035                                                 dev->nDeletedFiles++;
6036                                         }
6037                                         /* Note re hardlinks.
6038                                          * Since we might scan a hardlink before its equivalent object is scanned
6039                                          * we put them all in a list.
6040                                          * After scanning is complete, we should have all the objects, so we run through this
6041                                          * list and fix up all the chains.
6042                                          */
6043
6044                                         switch (in->variantType) {
6045                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
6046                                                 /* Todo got a problem */
6047                                                 break;
6048                                         case YAFFS_OBJECT_TYPE_FILE:
6049                                                 if (dev->useHeaderFileSize)
6050
6051                                                         in->variant.fileVariant.
6052                                                             fileSize =
6053                                                             oh->fileSize;
6054
6055                                                 break;
6056                                         case YAFFS_OBJECT_TYPE_HARDLINK:
6057                                                 in->variant.hardLinkVariant.
6058                                                         equivalentObjectId =
6059                                                         oh->equivalentObjectId;
6060                                                 in->hardLinks.next =
6061                                                         (struct ylist_head *)
6062                                                         hardList;
6063                                                 hardList = in;
6064                                                 break;
6065                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
6066                                                 /* Do nothing */
6067                                                 break;
6068                                         case YAFFS_OBJECT_TYPE_SPECIAL:
6069                                                 /* Do nothing */
6070                                                 break;
6071                                         case YAFFS_OBJECT_TYPE_SYMLINK:
6072                                                 in->variant.symLinkVariant.alias =
6073                                                     yaffs_CloneString(oh->alias);
6074                                                 if (!in->variant.symLinkVariant.alias)
6075                                                         alloc_failed = 1;
6076                                                 break;
6077                                         }
6078
6079                                 }
6080                         }
6081                 }
6082
6083                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6084                         /* If we got this far while scanning, then the block is fully allocated.*/
6085                         state = YAFFS_BLOCK_STATE_FULL;
6086                 }
6087
6088                 if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
6089                         /* If the block was partially allocated then treat it as fully allocated.*/
6090                         state = YAFFS_BLOCK_STATE_FULL;
6091                         dev->allocationBlock = -1;
6092                 }
6093
6094                 bi->blockState = state;
6095
6096                 /* Now let's see if it was dirty */
6097                 if (bi->pagesInUse == 0 &&
6098                     !bi->hasShrinkHeader &&
6099                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6100                         yaffs_BlockBecameDirty(dev, blk);
6101                 }
6102
6103         }
6104
6105
6106         /* Ok, we've done all the scanning.
6107          * Fix up the hard link chains.
6108          * We should now have scanned all the objects, now it's time to add these
6109          * hardlinks.
6110          */
6111
6112         yaffs_HardlinkFixup(dev, hardList);
6113
6114         /* Fix up any shadowed objects */
6115         {
6116                 struct yaffs_ShadowFixerStruct *fixer;
6117                 yaffs_Object *obj;
6118
6119                 while (shadowFixerList) {
6120                         fixer = shadowFixerList;
6121                         shadowFixerList = fixer->next;
6122                         /* Complete the rename transaction by deleting the shadowed object
6123                          * then setting the object header to unshadowed.
6124                          */
6125                         obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
6126                         if (obj)
6127                                 yaffs_DeleteObject(obj);
6128
6129                         obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
6130
6131                         if (obj)
6132                                 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6133
6134                         YFREE(fixer);
6135                 }
6136         }
6137
6138         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6139
6140         if (alloc_failed)
6141                 return YAFFS_FAIL;
6142
6143         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
6144
6145
6146         return YAFFS_OK;
6147 }
6148
6149 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
6150 {
6151         __u8 *chunkData;
6152         yaffs_ObjectHeader *oh;
6153         yaffs_Device *dev;
6154         yaffs_ExtendedTags tags;
6155         int result;
6156         int alloc_failed = 0;
6157
6158         if (!in)
6159                 return;
6160
6161         dev = in->myDev;
6162
6163 #if 0
6164         T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
6165                 in->objectId,
6166                 in->lazyLoaded ? "not yet" : "already"));
6167 #endif
6168
6169         if (in->lazyLoaded && in->hdrChunk > 0) {
6170                 in->lazyLoaded = 0;
6171                 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6172
6173                 result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
6174                 oh = (yaffs_ObjectHeader *) chunkData;
6175
6176                 in->yst_mode = oh->yst_mode;
6177 #ifdef CONFIG_YAFFS_WINCE
6178                 in->win_atime[0] = oh->win_atime[0];
6179                 in->win_ctime[0] = oh->win_ctime[0];
6180                 in->win_mtime[0] = oh->win_mtime[0];
6181                 in->win_atime[1] = oh->win_atime[1];
6182                 in->win_ctime[1] = oh->win_ctime[1];
6183                 in->win_mtime[1] = oh->win_mtime[1];
6184 #else
6185                 in->yst_uid = oh->yst_uid;
6186                 in->yst_gid = oh->yst_gid;
6187                 in->yst_atime = oh->yst_atime;
6188                 in->yst_mtime = oh->yst_mtime;
6189                 in->yst_ctime = oh->yst_ctime;
6190                 in->yst_rdev = oh->yst_rdev;
6191
6192 #endif
6193                 yaffs_SetObjectName(in, oh->name);
6194
6195                 if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6196                         in->variant.symLinkVariant.alias =
6197                                                     yaffs_CloneString(oh->alias);
6198                         if (!in->variant.symLinkVariant.alias)
6199                                 alloc_failed = 1; /* Not returned to caller */
6200                 }
6201
6202                 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6203         }
6204 }
6205
6206 static int yaffs_ScanBackwards(yaffs_Device *dev)
6207 {
6208         yaffs_ExtendedTags tags;
6209         int blk;
6210         int blockIterator;
6211         int startIterator;
6212         int endIterator;
6213         int nBlocksToScan = 0;
6214
6215         int chunk;
6216         int result;
6217         int c;
6218         int deleted;
6219         yaffs_BlockState state;
6220         yaffs_Object *hardList = NULL;
6221         yaffs_BlockInfo *bi;
6222         __u32 sequenceNumber;
6223         yaffs_ObjectHeader *oh;
6224         yaffs_Object *in;
6225         yaffs_Object *parent;
6226         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
6227         int itsUnlinked;
6228         __u8 *chunkData;
6229
6230         int fileSize;
6231         int isShrink;
6232         int foundChunksInBlock;
6233         int equivalentObjectId;
6234         int alloc_failed = 0;
6235
6236
6237         yaffs_BlockIndex *blockIndex = NULL;
6238         int altBlockIndex = 0;
6239
6240         if (!dev->isYaffs2) {
6241                 T(YAFFS_TRACE_SCAN,
6242                   (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
6243                 return YAFFS_FAIL;
6244         }
6245
6246         T(YAFFS_TRACE_SCAN,
6247           (TSTR
6248            ("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..."
6249             TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
6250
6251
6252         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
6253
6254         blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
6255
6256         if (!blockIndex) {
6257                 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
6258                 altBlockIndex = 1;
6259         }
6260
6261         if (!blockIndex) {
6262                 T(YAFFS_TRACE_SCAN,
6263                   (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
6264                 return YAFFS_FAIL;
6265         }
6266
6267         dev->blocksInCheckpoint = 0;
6268
6269         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6270
6271         /* Scan all the blocks to determine their state */
6272         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6273                 bi = yaffs_GetBlockInfo(dev, blk);
6274                 yaffs_ClearChunkBits(dev, blk);
6275                 bi->pagesInUse = 0;
6276                 bi->softDeletions = 0;
6277
6278                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6279
6280                 bi->blockState = state;
6281                 bi->sequenceNumber = sequenceNumber;
6282
6283                 if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6284                         bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6285                 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6286                         bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6287
6288                 T(YAFFS_TRACE_SCAN_DEBUG,
6289                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6290                    state, sequenceNumber));
6291
6292
6293                 if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
6294                         dev->blocksInCheckpoint++;
6295
6296                 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6297                         T(YAFFS_TRACE_BAD_BLOCKS,
6298                           (TSTR("block %d is bad" TENDSTR), blk));
6299                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6300                         T(YAFFS_TRACE_SCAN_DEBUG,
6301                           (TSTR("Block empty " TENDSTR)));
6302                         dev->nErasedBlocks++;
6303                         dev->nFreeChunks += dev->nChunksPerBlock;
6304                 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6305
6306                         /* Determine the highest sequence number */
6307                         if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6308                             sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6309
6310                                 blockIndex[nBlocksToScan].seq = sequenceNumber;
6311                                 blockIndex[nBlocksToScan].block = blk;
6312
6313                                 nBlocksToScan++;
6314
6315                                 if (sequenceNumber >= dev->sequenceNumber)
6316                                         dev->sequenceNumber = sequenceNumber;
6317                         } else {
6318                                 /* TODO: Nasty sequence number! */
6319                                 T(YAFFS_TRACE_SCAN,
6320                                   (TSTR
6321                                    ("Block scanning block %d has bad sequence number %d"
6322                                     TENDSTR), blk, sequenceNumber));
6323
6324                         }
6325                 }
6326         }
6327
6328         T(YAFFS_TRACE_SCAN,
6329         (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6330
6331
6332
6333         YYIELD();
6334
6335         /* Sort the blocks */
6336 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6337         {
6338                 /* Use qsort now. */
6339                 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6340         }
6341 #else
6342         {
6343                 /* Dungy old bubble sort... */
6344
6345                 yaffs_BlockIndex temp;
6346                 int i;
6347                 int j;
6348
6349                 for (i = 0; i < nBlocksToScan; i++)
6350                         for (j = i + 1; j < nBlocksToScan; j++)
6351                                 if (blockIndex[i].seq > blockIndex[j].seq) {
6352                                         temp = blockIndex[j];
6353                                         blockIndex[j] = blockIndex[i];
6354                                         blockIndex[i] = temp;
6355                                 }
6356         }
6357 #endif
6358
6359         YYIELD();
6360
6361         T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6362
6363         /* Now scan the blocks looking at the data. */
6364         startIterator = 0;
6365         endIterator = nBlocksToScan - 1;
6366         T(YAFFS_TRACE_SCAN_DEBUG,
6367           (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6368
6369         /* For each block.... backwards */
6370         for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6371                         blockIterator--) {
6372                 /* Cooperative multitasking! This loop can run for so
6373                    long that watchdog timers expire. */
6374                 YYIELD();
6375
6376                 /* get the block to scan in the correct order */
6377                 blk = blockIndex[blockIterator].block;
6378
6379                 bi = yaffs_GetBlockInfo(dev, blk);
6380
6381
6382                 state = bi->blockState;
6383
6384                 deleted = 0;
6385
6386                 /* For each chunk in each block that needs scanning.... */
6387                 foundChunksInBlock = 0;
6388                 for (c = dev->nChunksPerBlock - 1;
6389                      !alloc_failed && c >= 0 &&
6390                      (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6391                       state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6392                         /* Scan backwards...
6393                          * Read the tags and decide what to do
6394                          */
6395
6396                         chunk = blk * dev->nChunksPerBlock + c;
6397
6398                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6399                                                         &tags);
6400
6401                         /* Let's have a good look at this chunk... */
6402
6403                         if (!tags.chunkUsed) {
6404                                 /* An unassigned chunk in the block.
6405                                  * If there are used chunks after this one, then
6406                                  * it is a chunk that was skipped due to failing the erased
6407                                  * check. Just skip it so that it can be deleted.
6408                                  * But, more typically, We get here when this is an unallocated
6409                                  * chunk and his means that either the block is empty or
6410                                  * this is the one being allocated from
6411                                  */
6412
6413                                 if (foundChunksInBlock) {
6414                                         /* This is a chunk that was skipped due to failing the erased check */
6415                                 } else if (c == 0) {
6416                                         /* We're looking at the first chunk in the block so the block is unused */
6417                                         state = YAFFS_BLOCK_STATE_EMPTY;
6418                                         dev->nErasedBlocks++;
6419                                 } else {
6420                                         if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6421                                             state == YAFFS_BLOCK_STATE_ALLOCATING) {
6422                                                 if (dev->sequenceNumber == bi->sequenceNumber) {
6423                                                         /* this is the block being allocated from */
6424
6425                                                         T(YAFFS_TRACE_SCAN,
6426                                                           (TSTR
6427                                                            (" Allocating from %d %d"
6428                                                             TENDSTR), blk, c));
6429
6430                                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
6431                                                         dev->allocationBlock = blk;
6432                                                         dev->allocationPage = c;
6433                                                         dev->allocationBlockFinder = blk;
6434                                                 } else {
6435                                                         /* This is a partially written block that is not
6436                                                          * the current allocation block.
6437                                                          */
6438
6439                                                          T(YAFFS_TRACE_ALWAYS,
6440                                                          (TSTR("Partially written block %d detected" TENDSTR),
6441                                                          blk));
6442                                                 }
6443                                         }
6444                                 }
6445
6446                                 dev->nFreeChunks++;
6447
6448                         } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
6449                                 T(YAFFS_TRACE_SCAN,
6450                                   (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
6451                                   blk, c));
6452
6453                                   dev->nFreeChunks++;
6454
6455                         } else if (tags.chunkId > 0) {
6456                                 /* chunkId > 0 so it is a data chunk... */
6457                                 unsigned int endpos;
6458                                 __u32 chunkBase =
6459                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6460
6461                                 foundChunksInBlock = 1;
6462
6463
6464                                 yaffs_SetChunkBit(dev, blk, c);
6465                                 bi->pagesInUse++;
6466
6467                                 in = yaffs_FindOrCreateObjectByNumber(dev,
6468                                                                       tags.
6469                                                                       objectId,
6470                                                                       YAFFS_OBJECT_TYPE_FILE);
6471                                 if (!in) {
6472                                         /* Out of memory */
6473                                         alloc_failed = 1;
6474                                 }
6475
6476                                 if (in &&
6477                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
6478                                     && chunkBase <
6479                                     in->variant.fileVariant.shrinkSize) {
6480                                         /* This has not been invalidated by a resize */
6481                                         if (!yaffs_PutChunkIntoFile(in, tags.chunkId,
6482                                                                chunk, -1)) {
6483                                                 alloc_failed = 1;
6484                                         }
6485
6486                                         /* File size is calculated by looking at the data chunks if we have not
6487                                          * seen an object header yet. Stop this practice once we find an object header.
6488                                          */
6489                                         endpos =
6490                                             (tags.chunkId -
6491                                              1) * dev->nDataBytesPerChunk +
6492                                             tags.byteCount;
6493
6494                                         if (!in->valid &&       /* have not got an object header yet */
6495                                             in->variant.fileVariant.
6496                                             scannedFileSize < endpos) {
6497                                                 in->variant.fileVariant.
6498                                                     scannedFileSize = endpos;
6499                                                 in->variant.fileVariant.
6500                                                     fileSize =
6501                                                     in->variant.fileVariant.
6502                                                     scannedFileSize;
6503                                         }
6504
6505                                 } else if (in) {
6506                                         /* This chunk has been invalidated by a resize, so delete */
6507                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6508
6509                                 }
6510                         } else {
6511                                 /* chunkId == 0, so it is an ObjectHeader.
6512                                  * Thus, we read in the object header and make the object
6513                                  */
6514                                 foundChunksInBlock = 1;
6515
6516                                 yaffs_SetChunkBit(dev, blk, c);
6517                                 bi->pagesInUse++;
6518
6519                                 oh = NULL;
6520                                 in = NULL;
6521
6522                                 if (tags.extraHeaderInfoAvailable) {
6523                                         in = yaffs_FindOrCreateObjectByNumber
6524                                             (dev, tags.objectId,
6525                                              tags.extraObjectType);
6526                                         if (!in)
6527                                                 alloc_failed = 1;
6528                                 }
6529
6530                                 if (!in ||
6531                                     (!in->valid && dev->disableLazyLoad) ||
6532                                     tags.extraShadows ||
6533                                     (!in->valid &&
6534                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6535                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
6536
6537                                         /* If we don't have  valid info then we need to read the chunk
6538                                          * TODO In future we can probably defer reading the chunk and
6539                                          * living with invalid data until needed.
6540                                          */
6541
6542                                         result = yaffs_ReadChunkWithTagsFromNAND(dev,
6543                                                                         chunk,
6544                                                                         chunkData,
6545                                                                         NULL);
6546
6547                                         oh = (yaffs_ObjectHeader *) chunkData;
6548
6549                                         if (dev->inbandTags) {
6550                                                 /* Fix up the header if they got corrupted by inband tags */
6551                                                 oh->shadowsObject = oh->inbandShadowsObject;
6552                                                 oh->isShrink = oh->inbandIsShrink;
6553                                         }
6554
6555                                         if (!in) {
6556                                                 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6557                                                 if (!in)
6558                                                         alloc_failed = 1;
6559                                         }
6560
6561                                 }
6562
6563                                 if (!in) {
6564                                         /* TODO Hoosterman we have a problem! */
6565                                         T(YAFFS_TRACE_ERROR,
6566                                           (TSTR
6567                                            ("yaffs tragedy: Could not make object for object  %d at chunk %d during scan"
6568                                             TENDSTR), tags.objectId, chunk));
6569                                         continue;
6570                                 }
6571
6572                                 if (in->valid) {
6573                                         /* We have already filled this one.
6574                                          * We have a duplicate that will be discarded, but
6575                                          * we first have to suck out resize info if it is a file.
6576                                          */
6577
6578                                         if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6579                                              ((oh &&
6580                                                oh->type == YAFFS_OBJECT_TYPE_FILE) ||
6581                                               (tags.extraHeaderInfoAvailable  &&
6582                                                tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
6583                                                 __u32 thisSize =
6584                                                     (oh) ? oh->fileSize : tags.
6585                                                     extraFileLength;
6586                                                 __u32 parentObjectId =
6587                                                     (oh) ? oh->
6588                                                     parentObjectId : tags.
6589                                                     extraParentObjectId;
6590
6591
6592                                                 isShrink =
6593                                                     (oh) ? oh->isShrink : tags.
6594                                                     extraIsShrinkHeader;
6595
6596                                                 /* If it is deleted (unlinked at start also means deleted)
6597                                                  * we treat the file size as being zeroed at this point.
6598                                                  */
6599                                                 if (parentObjectId ==
6600                                                     YAFFS_OBJECTID_DELETED
6601                                                     || parentObjectId ==
6602                                                     YAFFS_OBJECTID_UNLINKED) {
6603                                                         thisSize = 0;
6604                                                         isShrink = 1;
6605                                                 }
6606
6607                                                 if (isShrink &&
6608                                                     in->variant.fileVariant.
6609                                                     shrinkSize > thisSize) {
6610                                                         in->variant.fileVariant.
6611                                                             shrinkSize =
6612                                                             thisSize;
6613                                                 }
6614
6615                                                 if (isShrink)
6616                                                         bi->hasShrinkHeader = 1;
6617
6618                                         }
6619                                         /* Use existing - destroy this one. */
6620                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6621
6622                                 }
6623
6624                                 if (!in->valid && in->variantType !=
6625                                     (oh ? oh->type : tags.extraObjectType))
6626                                         T(YAFFS_TRACE_ERROR, (
6627                                                 TSTR("yaffs tragedy: Bad object type, "
6628                                             TCONT("%d != %d, for object %d at chunk ")
6629                                             TCONT("%d during scan")
6630                                                 TENDSTR), oh ?
6631                                             oh->type : tags.extraObjectType,
6632                                             in->variantType, tags.objectId,
6633                                             chunk));
6634
6635                                 if (!in->valid &&
6636                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6637                                      tags.objectId ==
6638                                      YAFFS_OBJECTID_LOSTNFOUND)) {
6639                                         /* We only load some info, don't fiddle with directory structure */
6640                                         in->valid = 1;
6641
6642                                         if (oh) {
6643                                                 in->variantType = oh->type;
6644
6645                                                 in->yst_mode = oh->yst_mode;
6646 #ifdef CONFIG_YAFFS_WINCE
6647                                                 in->win_atime[0] = oh->win_atime[0];
6648                                                 in->win_ctime[0] = oh->win_ctime[0];
6649                                                 in->win_mtime[0] = oh->win_mtime[0];
6650                                                 in->win_atime[1] = oh->win_atime[1];
6651                                                 in->win_ctime[1] = oh->win_ctime[1];
6652                                                 in->win_mtime[1] = oh->win_mtime[1];
6653 #else
6654                                                 in->yst_uid = oh->yst_uid;
6655                                                 in->yst_gid = oh->yst_gid;
6656                                                 in->yst_atime = oh->yst_atime;
6657                                                 in->yst_mtime = oh->yst_mtime;
6658                                                 in->yst_ctime = oh->yst_ctime;
6659                                                 in->yst_rdev = oh->yst_rdev;
6660
6661 #endif
6662                                         } else {
6663                                                 in->variantType = tags.extraObjectType;
6664                                                 in->lazyLoaded = 1;
6665                                         }
6666
6667                                         in->hdrChunk = chunk;
6668
6669                                 } else if (!in->valid) {
6670                                         /* we need to load this info */
6671
6672                                         in->valid = 1;
6673                                         in->hdrChunk = chunk;
6674
6675                                         if (oh) {
6676                                                 in->variantType = oh->type;
6677
6678                                                 in->yst_mode = oh->yst_mode;
6679 #ifdef CONFIG_YAFFS_WINCE
6680                                                 in->win_atime[0] = oh->win_atime[0];
6681                                                 in->win_ctime[0] = oh->win_ctime[0];
6682                                                 in->win_mtime[0] = oh->win_mtime[0];
6683                                                 in->win_atime[1] = oh->win_atime[1];
6684                                                 in->win_ctime[1] = oh->win_ctime[1];
6685                                                 in->win_mtime[1] = oh->win_mtime[1];
6686 #else
6687                                                 in->yst_uid = oh->yst_uid;
6688                                                 in->yst_gid = oh->yst_gid;
6689                                                 in->yst_atime = oh->yst_atime;
6690                                                 in->yst_mtime = oh->yst_mtime;
6691                                                 in->yst_ctime = oh->yst_ctime;
6692                                                 in->yst_rdev = oh->yst_rdev;
6693 #endif
6694
6695                                                 if (oh->shadowsObject > 0)
6696                                                         yaffs_HandleShadowedObject(dev,
6697                                                                            oh->
6698                                                                            shadowsObject,
6699                                                                            1);
6700
6701
6702
6703                                                 yaffs_SetObjectName(in, oh->name);
6704                                                 parent =
6705                                                     yaffs_FindOrCreateObjectByNumber
6706                                                         (dev, oh->parentObjectId,
6707                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6708
6709                                                  fileSize = oh->fileSize;
6710                                                  isShrink = oh->isShrink;
6711                                                  equivalentObjectId = oh->equivalentObjectId;
6712
6713                                         } else {
6714                                                 in->variantType = tags.extraObjectType;
6715                                                 parent =
6716                                                     yaffs_FindOrCreateObjectByNumber
6717                                                         (dev, tags.extraParentObjectId,
6718                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6719                                                  fileSize = tags.extraFileLength;
6720                                                  isShrink = tags.extraIsShrinkHeader;
6721                                                  equivalentObjectId = tags.extraEquivalentObjectId;
6722                                                 in->lazyLoaded = 1;
6723
6724                                         }
6725                                         in->dirty = 0;
6726
6727                                         if (!parent)
6728                                                 alloc_failed = 1;
6729
6730                                         /* directory stuff...
6731                                          * hook up to parent
6732                                          */
6733
6734                                         if (parent && parent->variantType ==
6735                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
6736                                                 /* Set up as a directory */
6737                                                 parent->variantType =
6738                                                         YAFFS_OBJECT_TYPE_DIRECTORY;
6739                                                 YINIT_LIST_HEAD(&parent->variant.
6740                                                         directoryVariant.
6741                                                         children);
6742                                         } else if (!parent || parent->variantType !=
6743                                                    YAFFS_OBJECT_TYPE_DIRECTORY) {
6744                                                 /* Hoosterman, another problem....
6745                                                  * We're trying to use a non-directory as a directory
6746                                                  */
6747
6748                                                 T(YAFFS_TRACE_ERROR,
6749                                                   (TSTR
6750                                                    ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6751                                                     TENDSTR)));
6752                                                 parent = dev->lostNFoundDir;
6753                                         }
6754
6755                                         yaffs_AddObjectToDirectory(parent, in);
6756
6757                                         itsUnlinked = (parent == dev->deletedDir) ||
6758                                                       (parent == dev->unlinkedDir);
6759
6760                                         if (isShrink) {
6761                                                 /* Mark the block as having a shrinkHeader */
6762                                                 bi->hasShrinkHeader = 1;
6763                                         }
6764
6765                                         /* Note re hardlinks.
6766                                          * Since we might scan a hardlink before its equivalent object is scanned
6767                                          * we put them all in a list.
6768                                          * After scanning is complete, we should have all the objects, so we run
6769                                          * through this list and fix up all the chains.
6770                                          */
6771
6772                                         switch (in->variantType) {
6773                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
6774                                                 /* Todo got a problem */
6775                                                 break;
6776                                         case YAFFS_OBJECT_TYPE_FILE:
6777
6778                                                 if (in->variant.fileVariant.
6779                                                     scannedFileSize < fileSize) {
6780                                                         /* This covers the case where the file size is greater
6781                                                          * than where the data is
6782                                                          * This will happen if the file is resized to be larger
6783                                                          * than its current data extents.
6784                                                          */
6785                                                         in->variant.fileVariant.fileSize = fileSize;
6786                                                         in->variant.fileVariant.scannedFileSize =
6787                                                             in->variant.fileVariant.fileSize;
6788                                                 }
6789
6790                                                 if (isShrink &&
6791                                                     in->variant.fileVariant.shrinkSize > fileSize) {
6792                                                         in->variant.fileVariant.shrinkSize = fileSize;
6793                                                 }
6794
6795                                                 break;
6796                                         case YAFFS_OBJECT_TYPE_HARDLINK:
6797                                                 if (!itsUnlinked) {
6798                                                         in->variant.hardLinkVariant.equivalentObjectId =
6799                                                                 equivalentObjectId;
6800                                                         in->hardLinks.next =
6801                                                                 (struct ylist_head *) hardList;
6802                                                         hardList = in;
6803                                                 }
6804                                                 break;
6805                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
6806                                                 /* Do nothing */
6807                                                 break;
6808                                         case YAFFS_OBJECT_TYPE_SPECIAL:
6809                                                 /* Do nothing */
6810                                                 break;
6811                                         case YAFFS_OBJECT_TYPE_SYMLINK:
6812                                                 if (oh) {
6813                                                         in->variant.symLinkVariant.alias =
6814                                                                 yaffs_CloneString(oh->alias);
6815                                                         if (!in->variant.symLinkVariant.alias)
6816                                                                 alloc_failed = 1;
6817                                                 }
6818                                                 break;
6819                                         }
6820
6821                                 }
6822
6823                         }
6824
6825                 } /* End of scanning for each chunk */
6826
6827                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6828                         /* If we got this far while scanning, then the block is fully allocated. */
6829                         state = YAFFS_BLOCK_STATE_FULL;
6830                 }
6831
6832
6833                 bi->blockState = state;
6834
6835                 /* Now let's see if it was dirty */
6836                 if (bi->pagesInUse == 0 &&
6837                     !bi->hasShrinkHeader &&
6838                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6839                         yaffs_BlockBecameDirty(dev, blk);
6840                 }
6841
6842         }
6843
6844         yaffs_SkipRestOfBlock(dev);
6845
6846         if (altBlockIndex)
6847                 YFREE_ALT(blockIndex);
6848         else
6849                 YFREE(blockIndex);
6850
6851         /* Ok, we've done all the scanning.
6852          * Fix up the hard link chains.
6853          * We should now have scanned all the objects, now it's time to add these
6854          * hardlinks.
6855          */
6856         yaffs_HardlinkFixup(dev, hardList);
6857
6858
6859         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6860
6861         if (alloc_failed)
6862                 return YAFFS_FAIL;
6863
6864         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6865
6866         return YAFFS_OK;
6867 }
6868
6869 /*------------------------------  Directory Functions ----------------------------- */
6870
6871 static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
6872 {
6873         struct ylist_head *lh;
6874         yaffs_Object *listObj;
6875
6876         int count = 0;
6877
6878         if (!obj) {
6879                 T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
6880                 YBUG();
6881                 return;
6882         }
6883
6884         if (yaffs_SkipVerification(obj->myDev))
6885                 return;
6886
6887         if (!obj->parent) {
6888                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
6889                 YBUG();
6890                 return;
6891         }
6892
6893         if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6894                 T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
6895                 YBUG();
6896         }
6897
6898         /* Iterate through the objects in each hash entry */
6899
6900         ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
6901                 if (lh) {
6902                         listObj = ylist_entry(lh, yaffs_Object, siblings);
6903                         yaffs_VerifyObject(listObj);
6904                         if (obj == listObj)
6905                                 count++;
6906                 }
6907          }
6908
6909         if (count != 1) {
6910                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
6911                 YBUG();
6912         }
6913 }
6914
6915 static void yaffs_VerifyDirectory(yaffs_Object *directory)
6916 {
6917         struct ylist_head *lh;
6918         yaffs_Object *listObj;
6919
6920         if (!directory) {
6921                 YBUG();
6922                 return;
6923         }
6924
6925         if (yaffs_SkipFullVerification(directory->myDev))
6926                 return;
6927
6928         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6929                 T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
6930                 YBUG();
6931         }
6932
6933         /* Iterate through the objects in each hash entry */
6934
6935         ylist_for_each(lh, &directory->variant.directoryVariant.children) {
6936                 if (lh) {
6937                         listObj = ylist_entry(lh, yaffs_Object, siblings);
6938                         if (listObj->parent != directory) {
6939                                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
6940                                 YBUG();
6941                         }
6942                         yaffs_VerifyObjectInDirectory(listObj);
6943                 }
6944         }
6945 }
6946
6947 /*
6948  *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
6949  * link (ie. name) is created or deleted in the directory.
6950  *
6951  * ie.
6952  *   create dir/a : update dir's mtime/ctime
6953  *   rm dir/a:   update dir's mtime/ctime
6954  *   modify dir/a: don't update dir's mtimme/ctime
6955  */
6956
6957 static void yaffs_UpdateParent(yaffs_Object *obj)
6958 {
6959         if(!obj)
6960                 return;
6961
6962         obj->dirty = 1;
6963         obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
6964
6965         yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
6966 }
6967
6968 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
6969 {
6970         yaffs_Device *dev = obj->myDev;
6971         yaffs_Object *parent;
6972
6973         yaffs_VerifyObjectInDirectory(obj);
6974         parent = obj->parent;
6975
6976         yaffs_VerifyDirectory(parent);
6977
6978         if (dev && dev->removeObjectCallback)
6979                 dev->removeObjectCallback(obj);
6980
6981
6982         ylist_del_init(&obj->siblings);
6983         obj->parent = NULL;
6984
6985         yaffs_VerifyDirectory(parent);
6986 }
6987
6988 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
6989                                         yaffs_Object *obj)
6990 {
6991         if (!directory) {
6992                 T(YAFFS_TRACE_ALWAYS,
6993                   (TSTR
6994                    ("tragedy: Trying to add an object to a null pointer directory"
6995                     TENDSTR)));
6996                 YBUG();
6997                 return;
6998         }
6999         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7000                 T(YAFFS_TRACE_ALWAYS,
7001                   (TSTR
7002                    ("tragedy: Trying to add an object to a non-directory"
7003                     TENDSTR)));
7004                 YBUG();
7005         }
7006
7007         if (obj->siblings.prev == NULL) {
7008                 /* Not initialised */
7009                 YBUG();
7010         }
7011
7012
7013         yaffs_VerifyDirectory(directory);
7014
7015         yaffs_RemoveObjectFromDirectory(obj);
7016
7017
7018         /* Now add it */
7019         ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
7020         obj->parent = directory;
7021
7022         if (directory == obj->myDev->unlinkedDir
7023                         || directory == obj->myDev->deletedDir) {
7024                 obj->unlinked = 1;
7025                 obj->myDev->nUnlinkedFiles++;
7026                 obj->renameAllowed = 0;
7027         }
7028
7029         yaffs_VerifyDirectory(directory);
7030         yaffs_VerifyObjectInDirectory(obj);
7031 }
7032
7033 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
7034                                      const YCHAR *name)
7035 {
7036         int sum;
7037
7038         struct ylist_head *i;
7039         YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
7040
7041         yaffs_Object *l;
7042
7043         if (!name)
7044                 return NULL;
7045
7046         if (!directory) {
7047                 T(YAFFS_TRACE_ALWAYS,
7048                   (TSTR
7049                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
7050                     TENDSTR)));
7051                 YBUG();
7052                 return NULL;
7053         }
7054         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7055                 T(YAFFS_TRACE_ALWAYS,
7056                   (TSTR
7057                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7058                 YBUG();
7059         }
7060
7061         sum = yaffs_CalcNameSum(name);
7062
7063         ylist_for_each(i, &directory->variant.directoryVariant.children) {
7064                 if (i) {
7065                         l = ylist_entry(i, yaffs_Object, siblings);
7066
7067                         if (l->parent != directory)
7068                                 YBUG();
7069
7070                         yaffs_CheckObjectDetailsLoaded(l);
7071
7072                         /* Special case for lost-n-found */
7073                         if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7074                                 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
7075                                         return l;
7076                         } else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
7077                                 /* LostnFound chunk called Objxxx
7078                                  * Do a real check
7079                                  */
7080                                 yaffs_GetObjectName(l, buffer,
7081                                                     YAFFS_MAX_NAME_LENGTH + 1);
7082                                 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
7083                                         return l;
7084                         }
7085                 }
7086         }
7087
7088         return NULL;
7089 }
7090
7091
7092 #if 0
7093 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
7094                                         int (*fn) (yaffs_Object *))
7095 {
7096         struct ylist_head *i;
7097         yaffs_Object *l;
7098
7099         if (!theDir) {
7100                 T(YAFFS_TRACE_ALWAYS,
7101                   (TSTR
7102                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
7103                     TENDSTR)));
7104                 YBUG();
7105                 return YAFFS_FAIL;
7106         }
7107         if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7108                 T(YAFFS_TRACE_ALWAYS,
7109                   (TSTR
7110                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7111                 YBUG();
7112                 return YAFFS_FAIL;
7113         }
7114
7115         ylist_for_each(i, &theDir->variant.directoryVariant.children) {
7116                 if (i) {
7117                         l = ylist_entry(i, yaffs_Object, siblings);
7118                         if (l && !fn(l))
7119                                 return YAFFS_FAIL;
7120                 }
7121         }
7122
7123         return YAFFS_OK;
7124
7125 }
7126 #endif
7127
7128 /* GetEquivalentObject dereferences any hard links to get to the
7129  * actual object.
7130  */
7131
7132 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
7133 {
7134         if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
7135                 /* We want the object id of the equivalent object, not this one */
7136                 obj = obj->variant.hardLinkVariant.equivalentObject;
7137                 yaffs_CheckObjectDetailsLoaded(obj);
7138         }
7139         return obj;
7140 }
7141
7142 int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
7143 {
7144         memset(name, 0, buffSize * sizeof(YCHAR));
7145
7146         yaffs_CheckObjectDetailsLoaded(obj);
7147
7148         if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7149                 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
7150         } else if (obj->hdrChunk <= 0) {
7151                 YCHAR locName[20];
7152                 YCHAR numString[20];
7153                 YCHAR *x = &numString[19];
7154                 unsigned v = obj->objectId;
7155                 numString[19] = 0;
7156                 while (v > 0) {
7157                         x--;
7158                         *x = '0' + (v % 10);
7159                         v /= 10;
7160                 }
7161                 /* make up a name */
7162                 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
7163                 yaffs_strcat(locName, x);
7164                 yaffs_strncpy(name, locName, buffSize - 1);
7165
7166         }
7167 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
7168         else if (obj->shortName[0])
7169                 yaffs_strncpy(name, obj->shortName,YAFFS_SHORT_NAME_LENGTH+1);
7170 #endif
7171         else {
7172                 int result;
7173                 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
7174
7175                 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
7176
7177                 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
7178
7179                 if (obj->hdrChunk > 0) {
7180                         result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
7181                                                         obj->hdrChunk, buffer,
7182                                                         NULL);
7183                 }
7184                 yaffs_strncpy(name, oh->name, buffSize - 1);
7185                 name[buffSize-1]=0;
7186
7187                 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
7188         }
7189
7190         return yaffs_strnlen(name,buffSize-1);
7191 }
7192
7193 int yaffs_GetObjectFileLength(yaffs_Object *obj)
7194 {
7195         /* Dereference any hard linking */
7196         obj = yaffs_GetEquivalentObject(obj);
7197
7198         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
7199                 return obj->variant.fileVariant.fileSize;
7200         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
7201                 if(!obj->variant.symLinkVariant.alias)
7202                         return 0;
7203                 return yaffs_strnlen(obj->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
7204         } else {
7205                 /* Only a directory should drop through to here */
7206                 return obj->myDev->nDataBytesPerChunk;
7207         }
7208 }
7209
7210 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
7211 {
7212         int count = 0;
7213         struct ylist_head *i;
7214
7215         if (!obj->unlinked)
7216                 count++;                /* the object itself */
7217
7218         ylist_for_each(i, &obj->hardLinks)
7219                 count++;                /* add the hard links; */
7220
7221         return count;
7222 }
7223
7224 int yaffs_GetObjectInode(yaffs_Object *obj)
7225 {
7226         obj = yaffs_GetEquivalentObject(obj);
7227
7228         return obj->objectId;
7229 }
7230
7231 unsigned yaffs_GetObjectType(yaffs_Object *obj)
7232 {
7233         obj = yaffs_GetEquivalentObject(obj);
7234
7235         switch (obj->variantType) {
7236         case YAFFS_OBJECT_TYPE_FILE:
7237                 return DT_REG;
7238                 break;
7239         case YAFFS_OBJECT_TYPE_DIRECTORY:
7240                 return DT_DIR;
7241                 break;
7242         case YAFFS_OBJECT_TYPE_SYMLINK:
7243                 return DT_LNK;
7244                 break;
7245         case YAFFS_OBJECT_TYPE_HARDLINK:
7246                 return DT_REG;
7247                 break;
7248         case YAFFS_OBJECT_TYPE_SPECIAL:
7249                 if (S_ISFIFO(obj->yst_mode))
7250                         return DT_FIFO;
7251                 if (S_ISCHR(obj->yst_mode))
7252                         return DT_CHR;
7253                 if (S_ISBLK(obj->yst_mode))
7254                         return DT_BLK;
7255                 if (S_ISSOCK(obj->yst_mode))
7256                         return DT_SOCK;
7257         default:
7258                 return DT_REG;
7259                 break;
7260         }
7261 }
7262
7263 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
7264 {
7265         obj = yaffs_GetEquivalentObject(obj);
7266         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
7267                 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
7268         else
7269                 return yaffs_CloneString(_Y(""));
7270 }
7271
7272 #ifndef CONFIG_YAFFS_WINCE
7273
7274 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
7275 {
7276         unsigned int valid = attr->ia_valid;
7277
7278         if (valid & ATTR_MODE)
7279                 obj->yst_mode = attr->ia_mode;
7280         if (valid & ATTR_UID)
7281                 obj->yst_uid = attr->ia_uid;
7282         if (valid & ATTR_GID)
7283                 obj->yst_gid = attr->ia_gid;
7284
7285         if (valid & ATTR_ATIME)
7286                 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
7287         if (valid & ATTR_CTIME)
7288                 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
7289         if (valid & ATTR_MTIME)
7290                 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
7291
7292         if (valid & ATTR_SIZE)
7293                 yaffs_ResizeFile(obj, attr->ia_size);
7294
7295         yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
7296
7297         return YAFFS_OK;
7298
7299 }
7300 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
7301 {
7302         unsigned int valid = 0;
7303
7304         attr->ia_mode = obj->yst_mode;
7305         valid |= ATTR_MODE;
7306         attr->ia_uid = obj->yst_uid;
7307         valid |= ATTR_UID;
7308         attr->ia_gid = obj->yst_gid;
7309         valid |= ATTR_GID;
7310
7311         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
7312         valid |= ATTR_ATIME;
7313         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
7314         valid |= ATTR_CTIME;
7315         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
7316         valid |= ATTR_MTIME;
7317
7318         attr->ia_size = yaffs_GetFileSize(obj);
7319         valid |= ATTR_SIZE;
7320
7321         attr->ia_valid = valid;
7322
7323         return YAFFS_OK;
7324 }
7325
7326 #endif
7327
7328 #if 0
7329 int yaffs_DumpObject(yaffs_Object *obj)
7330 {
7331         YCHAR name[257];
7332
7333         yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
7334
7335         T(YAFFS_TRACE_ALWAYS,
7336           (TSTR
7337            ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
7338             " chunk %d type %d size %d\n"
7339             TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
7340            obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
7341            yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
7342
7343         return YAFFS_OK;
7344 }
7345 #endif
7346
7347 /*---------------------------- Initialisation code -------------------------------------- */
7348
7349 static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
7350 {
7351
7352         /* Common functions, gotta have */
7353         if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
7354                 return 0;
7355
7356 #ifdef CONFIG_YAFFS_YAFFS2
7357
7358         /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
7359         if (dev->writeChunkWithTagsToNAND &&
7360             dev->readChunkWithTagsFromNAND &&
7361             !dev->writeChunkToNAND &&
7362             !dev->readChunkFromNAND &&
7363             dev->markNANDBlockBad && dev->queryNANDBlock)
7364                 return 1;
7365 #endif
7366
7367         /* Can use the "spare" style interface for yaffs1 */
7368         if (!dev->isYaffs2 &&
7369             !dev->writeChunkWithTagsToNAND &&
7370             !dev->readChunkWithTagsFromNAND &&
7371             dev->writeChunkToNAND &&
7372             dev->readChunkFromNAND &&
7373             !dev->markNANDBlockBad && !dev->queryNANDBlock)
7374                 return 1;
7375
7376         return 0;               /* bad */
7377 }
7378
7379
7380 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7381 {
7382         /* Initialise the unlinked, deleted, root and lost and found directories */
7383
7384         dev->lostNFoundDir = dev->rootDir =  NULL;
7385         dev->unlinkedDir = dev->deletedDir = NULL;
7386
7387         dev->unlinkedDir =
7388             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7389
7390         dev->deletedDir =
7391             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7392
7393         dev->rootDir =
7394             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7395                                       YAFFS_ROOT_MODE | S_IFDIR);
7396         dev->lostNFoundDir =
7397             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7398                                       YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7399
7400         if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
7401                 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7402                 return YAFFS_OK;
7403         }
7404
7405         return YAFFS_FAIL;
7406 }
7407
7408 int yaffs_GutsInitialise(yaffs_Device *dev)
7409 {
7410         int init_failed = 0;
7411         unsigned x;
7412         int bits;
7413
7414         T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7415
7416         /* Check stuff that must be set */
7417
7418         if (!dev) {
7419                 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7420                 return YAFFS_FAIL;
7421         }
7422
7423         dev->internalStartBlock = dev->startBlock;
7424         dev->internalEndBlock = dev->endBlock;
7425         dev->blockOffset = 0;
7426         dev->chunkOffset = 0;
7427         dev->nFreeChunks = 0;
7428
7429         dev->gcBlock = -1;
7430
7431         if (dev->startBlock == 0) {
7432                 dev->internalStartBlock = dev->startBlock + 1;
7433                 dev->internalEndBlock = dev->endBlock + 1;
7434                 dev->blockOffset = 1;
7435                 dev->chunkOffset = dev->nChunksPerBlock;
7436         }
7437
7438         /* Check geometry parameters. */
7439
7440         if ((!dev->inbandTags && dev->isYaffs2 && dev->totalBytesPerChunk < 1024) ||
7441             (!dev->isYaffs2 && dev->totalBytesPerChunk < 512) ||
7442             (dev->inbandTags && !dev->isYaffs2) ||
7443              dev->nChunksPerBlock < 2 ||
7444              dev->nReservedBlocks < 2 ||
7445              dev->internalStartBlock <= 0 ||
7446              dev->internalEndBlock <= 0 ||
7447              dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2)) {   /* otherwise it is too small */
7448                 T(YAFFS_TRACE_ALWAYS,
7449                   (TSTR
7450                    ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
7451                     TENDSTR), dev->totalBytesPerChunk, dev->isYaffs2 ? "2" : "", dev->inbandTags));
7452                 return YAFFS_FAIL;
7453         }
7454
7455         if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7456                 T(YAFFS_TRACE_ALWAYS,
7457                   (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7458                 return YAFFS_FAIL;
7459         }
7460
7461         /* Sort out space for inband tags, if required */
7462         if (dev->inbandTags)
7463                 dev->nDataBytesPerChunk = dev->totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
7464         else
7465                 dev->nDataBytesPerChunk = dev->totalBytesPerChunk;
7466
7467         /* Got the right mix of functions? */
7468         if (!yaffs_CheckDevFunctions(dev)) {
7469                 /* Function missing */
7470                 T(YAFFS_TRACE_ALWAYS,
7471                   (TSTR
7472                    ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7473
7474                 return YAFFS_FAIL;
7475         }
7476
7477         /* This is really a compilation check. */
7478         if (!yaffs_CheckStructures()) {
7479                 T(YAFFS_TRACE_ALWAYS,
7480                   (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7481                 return YAFFS_FAIL;
7482         }
7483
7484         if (dev->isMounted) {
7485                 T(YAFFS_TRACE_ALWAYS,
7486                   (TSTR("yaffs: device already mounted\n" TENDSTR)));
7487                 return YAFFS_FAIL;
7488         }
7489
7490         /* Finished with most checks. One or two more checks happen later on too. */
7491
7492         dev->isMounted = 1;
7493
7494         /* OK now calculate a few things for the device */
7495
7496         /*
7497          *  Calculate all the chunk size manipulation numbers:
7498          */
7499         x = dev->nDataBytesPerChunk;
7500         /* We always use dev->chunkShift and dev->chunkDiv */
7501         dev->chunkShift = Shifts(x);
7502         x >>= dev->chunkShift;
7503         dev->chunkDiv = x;
7504         /* We only use chunk mask if chunkDiv is 1 */
7505         dev->chunkMask = (1<<dev->chunkShift) - 1;
7506
7507         /*
7508          * Calculate chunkGroupBits.
7509          * We need to find the next power of 2 > than internalEndBlock
7510          */
7511
7512         x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
7513
7514         bits = ShiftsGE(x);
7515
7516         /* Set up tnode width if wide tnodes are enabled. */
7517         if (!dev->wideTnodesDisabled) {
7518                 /* bits must be even so that we end up with 32-bit words */
7519                 if (bits & 1)
7520                         bits++;
7521                 if (bits < 16)
7522                         dev->tnodeWidth = 16;
7523                 else
7524                         dev->tnodeWidth = bits;
7525         } else
7526                 dev->tnodeWidth = 16;
7527
7528         dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7529
7530         /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7531          * so if the bitwidth of the
7532          * chunk range we're using is greater than 16 we need
7533          * to figure out chunk shift and chunkGroupSize
7534          */
7535
7536         if (bits <= dev->tnodeWidth)
7537                 dev->chunkGroupBits = 0;
7538         else
7539                 dev->chunkGroupBits = bits - dev->tnodeWidth;
7540
7541
7542         dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7543
7544         if (dev->nChunksPerBlock < dev->chunkGroupSize) {
7545                 /* We have a problem because the soft delete won't work if
7546                  * the chunk group size > chunks per block.
7547                  * This can be remedied by using larger "virtual blocks".
7548                  */
7549                 T(YAFFS_TRACE_ALWAYS,
7550                   (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7551
7552                 return YAFFS_FAIL;
7553         }
7554
7555         /* OK, we've finished verifying the device, lets continue with initialisation */
7556
7557         /* More device initialisation */
7558         dev->garbageCollections = 0;
7559         dev->passiveGarbageCollections = 0;
7560         dev->currentDirtyChecker = 0;
7561         dev->bufferedBlock = -1;
7562         dev->doingBufferedBlockRewrite = 0;
7563         dev->nDeletedFiles = 0;
7564         dev->nBackgroundDeletions = 0;
7565         dev->nUnlinkedFiles = 0;
7566         dev->eccFixed = 0;
7567         dev->eccUnfixed = 0;
7568         dev->tagsEccFixed = 0;
7569         dev->tagsEccUnfixed = 0;
7570         dev->nErasureFailures = 0;
7571         dev->nErasedBlocks = 0;
7572         dev->isDoingGC = 0;
7573         dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7574
7575         /* Initialise temporary buffers and caches. */
7576         if (!yaffs_InitialiseTempBuffers(dev))
7577                 init_failed = 1;
7578
7579         dev->srCache = NULL;
7580         dev->gcCleanupList = NULL;
7581
7582
7583         if (!init_failed &&
7584             dev->nShortOpCaches > 0) {
7585                 int i;
7586                 void *buf;
7587                 int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
7588
7589                 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
7590                         dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7591
7592                 dev->srCache =  YMALLOC(srCacheBytes);
7593
7594                 buf = (__u8 *) dev->srCache;
7595
7596                 if (dev->srCache)
7597                         memset(dev->srCache, 0, srCacheBytes);
7598
7599                 for (i = 0; i < dev->nShortOpCaches && buf; i++) {
7600                         dev->srCache[i].object = NULL;
7601                         dev->srCache[i].lastUse = 0;
7602                         dev->srCache[i].dirty = 0;
7603                         dev->srCache[i].data = buf = YMALLOC_DMA(dev->totalBytesPerChunk);
7604                 }
7605                 if (!buf)
7606                         init_failed = 1;
7607
7608                 dev->srLastUse = 0;
7609         }
7610
7611         dev->cacheHits = 0;
7612
7613         if (!init_failed) {
7614                 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
7615                 if (!dev->gcCleanupList)
7616                         init_failed = 1;
7617         }
7618
7619         if (dev->isYaffs2)
7620                 dev->useHeaderFileSize = 1;
7621
7622         if (!init_failed && !yaffs_InitialiseBlocks(dev))
7623                 init_failed = 1;
7624
7625         yaffs_InitialiseTnodes(dev);
7626         yaffs_InitialiseObjects(dev);
7627
7628         if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7629                 init_failed = 1;
7630
7631
7632         if (!init_failed) {
7633                 /* Now scan the flash. */
7634                 if (dev->isYaffs2) {
7635                         if (yaffs_CheckpointRestore(dev)) {
7636                                 yaffs_CheckObjectDetailsLoaded(dev->rootDir);
7637                                 T(YAFFS_TRACE_ALWAYS,
7638                                   (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7639                         } else {
7640
7641                                 /* Clean up the mess caused by an aborted checkpoint load
7642                                  * and scan backwards.
7643                                  */
7644                                 yaffs_DeinitialiseBlocks(dev);
7645                                 yaffs_DeinitialiseTnodes(dev);
7646                                 yaffs_DeinitialiseObjects(dev);
7647
7648
7649                                 dev->nErasedBlocks = 0;
7650                                 dev->nFreeChunks = 0;
7651                                 dev->allocationBlock = -1;
7652                                 dev->allocationPage = -1;
7653                                 dev->nDeletedFiles = 0;
7654                                 dev->nUnlinkedFiles = 0;
7655                                 dev->nBackgroundDeletions = 0;
7656                                 dev->oldestDirtySequence = 0;
7657
7658                                 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7659                                         init_failed = 1;
7660
7661                                 yaffs_InitialiseTnodes(dev);
7662                                 yaffs_InitialiseObjects(dev);
7663
7664                                 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7665                                         init_failed = 1;
7666
7667                                 if (!init_failed && !yaffs_ScanBackwards(dev))
7668                                         init_failed = 1;
7669                         }
7670                 } else if (!yaffs_Scan(dev))
7671                                 init_failed = 1;
7672
7673                 yaffs_StripDeletedObjects(dev);
7674                 yaffs_FixHangingObjects(dev);
7675                 if(dev->emptyLostAndFound)
7676                         yaffs_EmptyLostAndFound(dev);
7677         }
7678
7679         if (init_failed) {
7680                 /* Clean up the mess */
7681                 T(YAFFS_TRACE_TRACING,
7682                   (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7683
7684                 yaffs_Deinitialise(dev);
7685                 return YAFFS_FAIL;
7686         }
7687
7688         /* Zero out stats */
7689         dev->nPageReads = 0;
7690         dev->nPageWrites = 0;
7691         dev->nBlockErasures = 0;
7692         dev->nGCCopies = 0;
7693         dev->nRetriedWrites = 0;
7694
7695         dev->nRetiredBlocks = 0;
7696
7697         yaffs_VerifyFreeChunks(dev);
7698         yaffs_VerifyBlocks(dev);
7699
7700         /* Clean up any aborted checkpoint data */
7701         if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
7702                 yaffs_InvalidateCheckpoint(dev);
7703
7704         T(YAFFS_TRACE_TRACING,
7705           (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7706         return YAFFS_OK;
7707
7708 }
7709
7710 void yaffs_Deinitialise(yaffs_Device *dev)
7711 {
7712         if (dev->isMounted) {
7713                 int i;
7714
7715                 yaffs_DeinitialiseBlocks(dev);
7716                 yaffs_DeinitialiseTnodes(dev);
7717                 yaffs_DeinitialiseObjects(dev);
7718                 if (dev->nShortOpCaches > 0 &&
7719                     dev->srCache) {
7720
7721                         for (i = 0; i < dev->nShortOpCaches; i++) {
7722                                 if (dev->srCache[i].data)
7723                                         YFREE(dev->srCache[i].data);
7724                                 dev->srCache[i].data = NULL;
7725                         }
7726
7727                         YFREE(dev->srCache);
7728                         dev->srCache = NULL;
7729                 }
7730
7731                 YFREE(dev->gcCleanupList);
7732
7733                 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
7734                         YFREE(dev->tempBuffer[i].buffer);
7735
7736                 dev->isMounted = 0;
7737
7738                 if (dev->deinitialiseNAND)
7739                         dev->deinitialiseNAND(dev);
7740         }
7741 }
7742
7743 static int yaffs_CountFreeChunks(yaffs_Device *dev)
7744 {
7745         int nFree;
7746         int b;
7747
7748         yaffs_BlockInfo *blk;
7749
7750         for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7751                         b++) {
7752                 blk = yaffs_GetBlockInfo(dev, b);
7753
7754                 switch (blk->blockState) {
7755                 case YAFFS_BLOCK_STATE_EMPTY:
7756                 case YAFFS_BLOCK_STATE_ALLOCATING:
7757                 case YAFFS_BLOCK_STATE_COLLECTING:
7758                 case YAFFS_BLOCK_STATE_FULL:
7759                         nFree +=
7760                             (dev->nChunksPerBlock - blk->pagesInUse +
7761                              blk->softDeletions);
7762                         break;
7763                 default:
7764                         break;
7765                 }
7766         }
7767
7768         return nFree;
7769 }
7770
7771 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
7772 {
7773         /* This is what we report to the outside world */
7774
7775         int nFree;
7776         int nDirtyCacheChunks;
7777         int blocksForCheckpoint;
7778         int i;
7779
7780 #if 1
7781         nFree = dev->nFreeChunks;
7782 #else
7783         nFree = yaffs_CountFreeChunks(dev);
7784 #endif
7785
7786         nFree += dev->nDeletedFiles;
7787
7788         /* Now count the number of dirty chunks in the cache and subtract those */
7789
7790         for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
7791                 if (dev->srCache[i].dirty)
7792                         nDirtyCacheChunks++;
7793         }
7794
7795         nFree -= nDirtyCacheChunks;
7796
7797         nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
7798
7799         /* Now we figure out how much to reserve for the checkpoint and report that... */
7800         blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
7801         if (blocksForCheckpoint < 0)
7802                 blocksForCheckpoint = 0;
7803
7804         nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
7805
7806         if (nFree < 0)
7807                 nFree = 0;
7808
7809         return nFree;
7810
7811 }
7812
7813 static int yaffs_freeVerificationFailures;
7814
7815 static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
7816 {
7817         int counted;
7818         int difference;
7819
7820         if (yaffs_SkipVerification(dev))
7821                 return;
7822
7823         counted = yaffs_CountFreeChunks(dev);
7824
7825         difference = dev->nFreeChunks - counted;
7826
7827         if (difference) {
7828                 T(YAFFS_TRACE_ALWAYS,
7829                   (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7830                    dev->nFreeChunks, counted, difference));
7831                 yaffs_freeVerificationFailures++;
7832         }
7833 }
7834
7835 /*---------------------------------------- YAFFS test code ----------------------*/
7836
7837 #define yaffs_CheckStruct(structure, syze, name) \
7838         do { \
7839                 if (sizeof(structure) != syze) { \
7840                         T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
7841                                 name, syze, (int) sizeof(structure))); \
7842                         return YAFFS_FAIL; \
7843                 } \
7844         } while (0)
7845
7846 static int yaffs_CheckStructures(void)
7847 {
7848 /*      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
7849 /*      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
7850 /*      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
7851 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7852 /*      yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode"); */
7853 #endif
7854 #ifndef CONFIG_YAFFS_WINCE
7855         yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");
7856 #endif
7857         return YAFFS_OK;
7858 }