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 1.96 2009-12-03 03:42:28 charles Exp $";
  16
  17 #include "yportenv.h"
  18
  19 #include "yaffsinterface.h"
  20 #include "yaffs_guts.h"
  21 #include "yaffs_tagsvalidity.h"
  22 #include "yaffs_getblockinfo.h"
  23
  24 #include "yaffs_tagscompat.h"
  25 #ifndef CONFIG_YAFFS_USE_OWN_SORT
  26 #include "yaffs_qsort.h"
  27 #endif
  28 #include "yaffs_nand.h"
  29
  30 #include "yaffs_checkptrw.h"
  31
  32 #include "yaffs_nand.h"
  33 #include "yaffs_packedtags2.h"
  34
  35
  36 #define YAFFS_PASSIVE_GC_CHUNKS 2
  37
  38 #include "yaffs_ecc.h"
  39
  40
  41 /* Robustification (if it ever comes about...) */
  42 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND);
  43 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
  44                 int erasedOk);
  45 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
  46                                 const __u8 *data,
  47                                 const yaffs_ExtendedTags *tags);
  48 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
  49                                 const yaffs_ExtendedTags *tags);
  50
  51 /* Other local prototypes */
  52 static void yaffs_UpdateParent(yaffs_Object *obj);
  53 static int yaffs_UnlinkObject(yaffs_Object *obj);
  54 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
  55
  56 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
  57
  58 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev,
  59                                         const __u8 *buffer,
  60                                         yaffs_ExtendedTags *tags,
  61                                         int useReserve);
  62 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
  63                                 int chunkInNAND, int inScan);
  64
  65 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
  66                                         yaffs_ObjectType type);
  67 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
  68                                 yaffs_Object *obj);
  69 static int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name,
  70                                 int force, int isShrink, int shadows);
  71 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
  72 static int yaffs_CheckStructures(void);
  73 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
  74                         int chunkOffset, int *limit);
  75 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
  76
  77 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev, int blockNo);
  78
  79
  80 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
  81                                 int chunkInNAND);
  82
  83 static int yaffs_UnlinkWorker(yaffs_Object *obj);
  84
  85 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
  86                         int chunkInObject);
  87
  88 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
  89                                 yaffs_BlockInfo **blockUsedPtr);
  90
  91 static void yaffs_VerifyFreeChunks(yaffs_Device *dev);
  92
  93 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
  94
  95 static void yaffs_VerifyDirectory(yaffs_Object *directory);
  96 #ifdef YAFFS_PARANOID
  97 static int yaffs_CheckFileSanity(yaffs_Object *in);
  98 #else
  99 #define yaffs_CheckFileSanity(in)
 100 #endif
 101
 102 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
 103 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
 104
 105 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
 106
 107 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
 108                                 yaffs_ExtendedTags *tags);
 109
 110 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
 111                 unsigned pos);
 112 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
 113                                         yaffs_FileStructure *fStruct,
 114                                         __u32 chunkId);
 115
 116 /* Function to calculate chunk and offset */
 117
 118 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut,
 119                 __u32 *offsetOut)
 120 {
 121         int chunk;
 122         __u32 offset;
 123
 124         chunk  = (__u32)(addr >> dev->chunkShift);
 125
 126         if (dev->chunkDiv == 1) {
 127                 /* easy power of 2 case */
 128                 offset = (__u32)(addr & dev->chunkMask);
 129         } else {
 130                 /* Non power-of-2 case */
 131
 132                 loff_t chunkBase;
 133
 134                 chunk /= dev->chunkDiv;
 135
 136                 chunkBase = ((loff_t)chunk) * dev->nDataBytesPerChunk;
 137                 offset = (__u32)(addr - chunkBase);
 138         }
 139
 140         *chunkOut = chunk;
 141         *offsetOut = offset;
 142 }
 143
 144 /* Function to return the number of shifts for a power of 2 greater than or
 145  * equal to the given number
 146  * Note we don't try to cater for all possible numbers and this does not have to
 147  * be hellishly efficient.
 148  */
 149
 150 static __u32 ShiftsGE(__u32 x)
 151 {
 152         int extraBits;
 153         int nShifts;
 154
 155         nShifts = extraBits = 0;
 156
 157         while (x > 1) {
 158                 if (x & 1)
 159                         extraBits++;
 160                 x >>= 1;
 161                 nShifts++;
 162         }
 163
 164         if (extraBits)
 165                 nShifts++;
 166
 167         return nShifts;
 168 }
 169
 170 /* Function to return the number of shifts to get a 1 in bit 0
 171  */
 172
 173 static __u32 Shifts(__u32 x)
 174 {
 175         int nShifts;
 176
 177         nShifts =  0;
 178
 179         if (!x)
 180                 return 0;
 181
 182         while (!(x&1)) {
 183                 x >>= 1;
 184                 nShifts++;
 185         }
 186
 187         return nShifts;
 188 }
 189
 190
 191
 192 /*
 193  * Temporary buffer manipulations.
 194  */
 195
 196 static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
 197 {
 198         int i;
 199         __u8 *buf = (__u8 *)1;
 200
 201         memset(dev->tempBuffer, 0, sizeof(dev->tempBuffer));
 202
 203         for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
 204                 dev->tempBuffer[i].line = 0;    /* not in use */
 205                 dev->tempBuffer[i].buffer = buf =
 206                     YMALLOC_DMA(dev->totalBytesPerChunk);
 207         }
 208
 209         return buf ? YAFFS_OK : YAFFS_FAIL;
 210 }
 211
 212 __u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo)
 213 {
 214         int i, j;
 215
 216         dev->tempInUse++;
 217         if (dev->tempInUse > dev->maxTemp)
 218                 dev->maxTemp = dev->tempInUse;
 219
 220         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 221                 if (dev->tempBuffer[i].line == 0) {
 222                         dev->tempBuffer[i].line = lineNo;
 223                         if ((i + 1) > dev->maxTemp) {
 224                                 dev->maxTemp = i + 1;
 225                                 for (j = 0; j <= i; j++)
 226                                         dev->tempBuffer[j].maxLine =
 227                                             dev->tempBuffer[j].line;
 228                         }
 229
 230                         return dev->tempBuffer[i].buffer;
 231                 }
 232         }
 233
 234         T(YAFFS_TRACE_BUFFERS,
 235           (TSTR("Out of temp buffers at line %d, other held by lines:"),
 236            lineNo));
 237         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
 238                 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
 239
 240         T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
 241
 242         /*
 243          * If we got here then we have to allocate an unmanaged one
 244          * This is not good.
 245          */
 246
 247         dev->unmanagedTempAllocations++;
 248         return YMALLOC(dev->nDataBytesPerChunk);
 249
 250 }
 251
 252 void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer,
 253                                     int lineNo)
 254 {
 255         int i;
 256
 257         dev->tempInUse--;
 258
 259         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 260                 if (dev->tempBuffer[i].buffer == buffer) {
 261                         dev->tempBuffer[i].line = 0;
 262                         return;
 263                 }
 264         }
 265
 266         if (buffer) {
 267                 /* assume it is an unmanaged one. */
 268                 T(YAFFS_TRACE_BUFFERS,
 269                   (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
 270                    lineNo));
 271                 YFREE(buffer);
 272                 dev->unmanagedTempDeallocations++;
 273         }
 274
 275 }
 276
 277 /*
 278  * Determine if we have a managed buffer.
 279  */
 280 int yaffs_IsManagedTempBuffer(yaffs_Device *dev, const __u8 *buffer)
 281 {
 282         int i;
 283
 284         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 285                 if (dev->tempBuffer[i].buffer == buffer)
 286                         return 1;
 287         }
 288
 289         for (i = 0; i < dev->nShortOpCaches; i++) {
 290                 if (dev->srCache[i].data == buffer)
 291                         return 1;
 292         }
 293
 294         if (buffer == dev->checkpointBuffer)
 295                 return 1;
 296
 297         T(YAFFS_TRACE_ALWAYS,
 298                 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
 299         return 0;
 300 }
 301
 302
 303
 304 /*
 305  * Chunk bitmap manipulations
 306  */
 307
 308 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
 309 {
 310         if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
 311                 T(YAFFS_TRACE_ERROR,
 312                         (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
 313                         blk));
 314                 YBUG();
 315         }
 316         return dev->chunkBits +
 317                 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
 318 }
 319
 320 static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
 321 {
 322         if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
 323                         chunk < 0 || chunk >= dev->nChunksPerBlock) {
 324                 T(YAFFS_TRACE_ERROR,
 325                 (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
 326                         blk, chunk));
 327                 YBUG();
 328         }
 329 }
 330
 331 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
 332 {
 333         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 334
 335         memset(blkBits, 0, dev->chunkBitmapStride);
 336 }
 337
 338 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk)
 339 {
 340         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 341
 342         yaffs_VerifyChunkBitId(dev, blk, chunk);
 343
 344         blkBits[chunk / 8] &= ~(1 << (chunk & 7));
 345 }
 346
 347 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk)
 348 {
 349         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 350
 351         yaffs_VerifyChunkBitId(dev, blk, chunk);
 352
 353         blkBits[chunk / 8] |= (1 << (chunk & 7));
 354 }
 355
 356 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk)
 357 {
 358         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 359         yaffs_VerifyChunkBitId(dev, blk, chunk);
 360
 361         return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
 362 }
 363
 364 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk)
 365 {
 366         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 367         int i;
 368         for (i = 0; i < dev->chunkBitmapStride; i++) {
 369                 if (*blkBits)
 370                         return 1;
 371                 blkBits++;
 372         }
 373         return 0;
 374 }
 375
 376 static int yaffs_CountChunkBits(yaffs_Device *dev, int blk)
 377 {
 378         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 379         int i;
 380         int n = 0;
 381         for (i = 0; i < dev->chunkBitmapStride; i++) {
 382                 __u8 x = *blkBits;
 383                 while (x) {
 384                         if (x & 1)
 385                                 n++;
 386                         x >>= 1;
 387                 }
 388
 389                 blkBits++;
 390         }
 391         return n;
 392 }
 393
 394 /*
 395  * Verification code
 396  */
 397
 398 static int yaffs_SkipVerification(yaffs_Device *dev)
 399 {
 400         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
 401 }
 402
 403 static int yaffs_SkipFullVerification(yaffs_Device *dev)
 404 {
 405         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
 406 }
 407
 408 static int yaffs_SkipNANDVerification(yaffs_Device *dev)
 409 {
 410         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
 411 }
 412
 413 static const char *blockStateName[] = {
 414 "Unknown",
 415 "Needs scanning",
 416 "Scanning",
 417 "Empty",
 418 "Allocating",
 419 "Full",
 420 "Dirty",
 421 "Checkpoint",
 422 "Collecting",
 423 "Dead"
 424 };
 425
 426 static void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
 427 {
 428         int actuallyUsed;
 429         int inUse;
 430
 431         if (yaffs_SkipVerification(dev))
 432                 return;
 433
 434         /* Report illegal runtime states */
 435         if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
 436                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState));
 437
 438         switch (bi->blockState) {
 439         case YAFFS_BLOCK_STATE_UNKNOWN:
 440         case YAFFS_BLOCK_STATE_SCANNING:
 441         case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
 442                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
 443                 n, blockStateName[bi->blockState]));
 444         }
 445
 446         /* Check pages in use and soft deletions are legal */
 447
 448         actuallyUsed = bi->pagesInUse - bi->softDeletions;
 449
 450         if (bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
 451            bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
 452            actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
 453                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
 454                 n, bi->pagesInUse, bi->softDeletions));
 455
 456
 457         /* Check chunk bitmap legal */
 458         inUse = yaffs_CountChunkBits(dev, n);
 459         if (inUse != bi->pagesInUse)
 460                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
 461                         n, bi->pagesInUse, inUse));
 462
 463         /* Check that the sequence number is valid.
 464          * Ten million is legal, but is very unlikely
 465          */
 466         if (dev->isYaffs2 &&
 467            (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
 468            (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000))
 469                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has suspect sequence number of %d"TENDSTR),
 470                 n, bi->sequenceNumber));
 471 }
 472
 473 static void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi,
 474                 int n)
 475 {
 476         yaffs_VerifyBlock(dev, bi, n);
 477
 478         /* After collection the block should be in the erased state */
 479         /* This will need to change if we do partial gc */
 480
 481         if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
 482                         bi->blockState != YAFFS_BLOCK_STATE_EMPTY) {
 483                 T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
 484                         n, bi->blockState));
 485         }
 486 }
 487
 488 static void yaffs_VerifyBlocks(yaffs_Device *dev)
 489 {
 490         int i;
 491         int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
 492         int nIllegalBlockStates = 0;
 493
 494         if (yaffs_SkipVerification(dev))
 495                 return;
 496
 497         memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
 498
 499         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
 500                 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
 501                 yaffs_VerifyBlock(dev, bi, i);
 502
 503                 if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
 504                         nBlocksPerState[bi->blockState]++;
 505                 else
 506                         nIllegalBlockStates++;
 507         }
 508
 509         T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
 510         T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
 511
 512         T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
 513         if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
 514                 T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
 515
 516         for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
 517                 T(YAFFS_TRACE_VERIFY,
 518                   (TSTR("%s %d blocks"TENDSTR),
 519                   blockStateName[i], nBlocksPerState[i]));
 520
 521         if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
 522                 T(YAFFS_TRACE_VERIFY,
 523                  (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
 524                  dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
 525
 526         if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
 527                 T(YAFFS_TRACE_VERIFY,
 528                  (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
 529                  dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
 530
 531         if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
 532                 T(YAFFS_TRACE_VERIFY,
 533                  (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
 534                  nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
 535
 536         T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
 537
 538 }
 539
 540 /*
 541  * Verify the object header. oh must be valid, but obj and tags may be NULL in which
 542  * case those tests will not be performed.
 543  */
 544 static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
 545 {
 546         if (obj && yaffs_SkipVerification(obj->myDev))
 547                 return;
 548
 549         if (!(tags && obj && oh)) {
 550                 T(YAFFS_TRACE_VERIFY,
 551                                 (TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
 552                                 (__u32)tags, (__u32)obj, (__u32)oh));
 553                 return;
 554         }
 555
 556         if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
 557                         oh->type > YAFFS_OBJECT_TYPE_MAX)
 558                 T(YAFFS_TRACE_VERIFY,
 559                         (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
 560                         tags->objectId, oh->type));
 561
 562         if (tags->objectId != obj->objectId)
 563                 T(YAFFS_TRACE_VERIFY,
 564                         (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
 565                         tags->objectId, obj->objectId));
 566
 567
 568         /*
 569          * Check that the object's parent ids match if parentCheck requested.
 570          *
 571          * Tests do not apply to the root object.
 572          */
 573
 574         if (parentCheck && tags->objectId > 1 && !obj->parent)
 575                 T(YAFFS_TRACE_VERIFY,
 576                         (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
 577                         tags->objectId, oh->parentObjectId));
 578
 579         if (parentCheck && obj->parent &&
 580                         oh->parentObjectId != obj->parent->objectId &&
 581                         (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
 582                         obj->parent->objectId != YAFFS_OBJECTID_DELETED))
 583                 T(YAFFS_TRACE_VERIFY,
 584                         (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
 585                         tags->objectId, oh->parentObjectId, obj->parent->objectId));
 586
 587         if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */
 588                 T(YAFFS_TRACE_VERIFY,
 589                         (TSTR("Obj %d header name is NULL"TENDSTR),
 590                         obj->objectId));
 591
 592         if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
 593                 T(YAFFS_TRACE_VERIFY,
 594                         (TSTR("Obj %d header name is 0xFF"TENDSTR),
 595                         obj->objectId));
 596 }
 597
 598
 599
 600 static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
 601                                         __u32 level, int chunkOffset)
 602 {
 603         int i;
 604         yaffs_Device *dev = obj->myDev;
 605         int ok = 1;
 606
 607         if (tn) {
 608                 if (level > 0) {
 609
 610                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
 611                                 if (tn->internal[i]) {
 612                                         ok = yaffs_VerifyTnodeWorker(obj,
 613                                                         tn->internal[i],
 614                                                         level - 1,
 615                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
 616                                 }
 617                         }
 618                 } else if (level == 0) {
 619                         yaffs_ExtendedTags tags;
 620                         __u32 objectId = obj->objectId;
 621
 622                         chunkOffset <<=  YAFFS_TNODES_LEVEL0_BITS;
 623
 624                         for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
 625                                 __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
 626
 627                                 if (theChunk > 0) {
 628                                         /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
 629                                         yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
 630                                         if (tags.objectId != objectId || tags.chunkId != chunkOffset) {
 631                                                 T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
 632                                                         objectId, chunkOffset, theChunk,
 633                                                         tags.objectId, tags.chunkId));
 634                                         }
 635                                 }
 636                                 chunkOffset++;
 637                         }
 638                 }
 639         }
 640
 641         return ok;
 642
 643 }
 644
 645
 646 static void yaffs_VerifyFile(yaffs_Object *obj)
 647 {
 648         int requiredTallness;
 649         int actualTallness;
 650         __u32 lastChunk;
 651         __u32 x;
 652         __u32 i;
 653         yaffs_Device *dev;
 654         yaffs_ExtendedTags tags;
 655         yaffs_Tnode *tn;
 656         __u32 objectId;
 657
 658         if (!obj)
 659                 return;
 660
 661         if (yaffs_SkipVerification(obj->myDev))
 662                 return;
 663
 664         dev = obj->myDev;
 665         objectId = obj->objectId;
 666
 667         /* Check file size is consistent with tnode depth */
 668         lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
 669         x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
 670         requiredTallness = 0;
 671         while (x > 0) {
 672                 x >>= YAFFS_TNODES_INTERNAL_BITS;
 673                 requiredTallness++;
 674         }
 675
 676         actualTallness = obj->variant.fileVariant.topLevel;
 677
 678         if (requiredTallness > actualTallness)
 679                 T(YAFFS_TRACE_VERIFY,
 680                 (TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
 681                  obj->objectId, actualTallness, requiredTallness));
 682
 683
 684         /* Check that the chunks in the tnode tree are all correct.
 685          * We do this by scanning through the tnode tree and
 686          * checking the tags for every chunk match.
 687          */
 688
 689         if (yaffs_SkipNANDVerification(dev))
 690                 return;
 691
 692         for (i = 1; i <= lastChunk; i++) {
 693                 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i);
 694
 695                 if (tn) {
 696                         __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
 697                         if (theChunk > 0) {
 698                                 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
 699                                 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
 700                                 if (tags.objectId != objectId || tags.chunkId != i) {
 701                                         T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
 702                                                 objectId, i, theChunk,
 703                                                 tags.objectId, tags.chunkId));
 704                                 }
 705                         }
 706                 }
 707         }
 708 }
 709
 710
 711 static void yaffs_VerifyHardLink(yaffs_Object *obj)
 712 {
 713         if (obj && yaffs_SkipVerification(obj->myDev))
 714                 return;
 715
 716         /* Verify sane equivalent object */
 717 }
 718
 719 static void yaffs_VerifySymlink(yaffs_Object *obj)
 720 {
 721         if (obj && yaffs_SkipVerification(obj->myDev))
 722                 return;
 723
 724         /* Verify symlink string */
 725 }
 726
 727 static void yaffs_VerifySpecial(yaffs_Object *obj)
 728 {
 729         if (obj && yaffs_SkipVerification(obj->myDev))
 730                 return;
 731 }
 732
 733 static void yaffs_VerifyObject(yaffs_Object *obj)
 734 {
 735         yaffs_Device *dev;
 736
 737         __u32 chunkMin;
 738         __u32 chunkMax;
 739
 740         __u32 chunkIdOk;
 741         __u32 chunkInRange;
 742         __u32 chunkShouldNotBeDeleted;
 743         __u32 chunkValid;
 744
 745         if (!obj)
 746                 return;
 747
 748         if (obj->beingCreated)
 749                 return;
 750
 751         dev = obj->myDev;
 752
 753         if (yaffs_SkipVerification(dev))
 754                 return;
 755
 756         /* Check sane object header chunk */
 757
 758         chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
 759         chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
 760
 761         chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
 762         chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
 763         chunkValid = chunkInRange &&
 764                         yaffs_CheckChunkBit(dev,
 765                                         obj->hdrChunk / dev->nChunksPerBlock,
 766                                         obj->hdrChunk % dev->nChunksPerBlock);
 767         chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
 768
 769         if (!obj->fake &&
 770                         (!chunkIdOk || chunkShouldNotBeDeleted)) {
 771                 T(YAFFS_TRACE_VERIFY,
 772                         (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
 773                         obj->objectId, obj->hdrChunk,
 774                         chunkIdOk ? "" : ",out of range",
 775                         chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
 776         }
 777
 778         if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
 779                 yaffs_ExtendedTags tags;
 780                 yaffs_ObjectHeader *oh;
 781                 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
 782
 783                 oh = (yaffs_ObjectHeader *)buffer;
 784
 785                 yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer,
 786                                 &tags);
 787
 788                 yaffs_VerifyObjectHeader(obj, oh, &tags, 1);
 789
 790                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
 791         }
 792
 793         /* Verify it has a parent */
 794         if (obj && !obj->fake &&
 795                         (!obj->parent || obj->parent->myDev != dev)) {
 796                 T(YAFFS_TRACE_VERIFY,
 797                         (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
 798                         obj->objectId, obj->parent));
 799         }
 800
 801         /* Verify parent is a directory */
 802         if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
 803                 T(YAFFS_TRACE_VERIFY,
 804                         (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
 805                         obj->objectId, obj->parent->variantType));
 806         }
 807
 808         switch (obj->variantType) {
 809         case YAFFS_OBJECT_TYPE_FILE:
 810                 yaffs_VerifyFile(obj);
 811                 break;
 812         case YAFFS_OBJECT_TYPE_SYMLINK:
 813                 yaffs_VerifySymlink(obj);
 814                 break;
 815         case YAFFS_OBJECT_TYPE_DIRECTORY:
 816                 yaffs_VerifyDirectory(obj);
 817                 break;
 818         case YAFFS_OBJECT_TYPE_HARDLINK:
 819                 yaffs_VerifyHardLink(obj);
 820                 break;
 821         case YAFFS_OBJECT_TYPE_SPECIAL:
 822                 yaffs_VerifySpecial(obj);
 823                 break;
 824         case YAFFS_OBJECT_TYPE_UNKNOWN:
 825         default:
 826                 T(YAFFS_TRACE_VERIFY,
 827                 (TSTR("Obj %d has illegaltype %d"TENDSTR),
 828                 obj->objectId, obj->variantType));
 829                 break;
 830         }
 831 }
 832
 833 static void yaffs_VerifyObjects(yaffs_Device *dev)
 834 {
 835         yaffs_Object *obj;
 836         int i;
 837         struct ylist_head *lh;
 838
 839         if (yaffs_SkipVerification(dev))
 840                 return;
 841
 842         /* Iterate through the objects in each hash entry */
 843
 844         for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
 845                 ylist_for_each(lh, &dev->objectBucket[i].list) {
 846                         if (lh) {
 847                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
 848                                 yaffs_VerifyObject(obj);
 849                         }
 850                 }
 851         }
 852 }
 853
 854
 855 /*
 856  *  Simple hash function. Needs to have a reasonable spread
 857  */
 858
 859 static Y_INLINE int yaffs_HashFunction(int n)
 860 {
 861         n = abs(n);
 862         return n % YAFFS_NOBJECT_BUCKETS;
 863 }
 864
 865 /*
 866  * Access functions to useful fake objects.
 867  * Note that root might have a presence in NAND if permissions are set.
 868  */
 869
 870 yaffs_Object *yaffs_Root(yaffs_Device *dev)
 871 {
 872         return dev->rootDir;
 873 }
 874
 875 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
 876 {
 877         return dev->lostNFoundDir;
 878 }
 879
 880
 881 /*
 882  *  Erased NAND checking functions
 883  */
 884
 885 int yaffs_CheckFF(__u8 *buffer, int nBytes)
 886 {
 887         /* Horrible, slow implementation */
 888         while (nBytes--) {
 889                 if (*buffer != 0xFF)
 890                         return 0;
 891                 buffer++;
 892         }
 893         return 1;
 894 }
 895
 896 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
 897                                 int chunkInNAND)
 898 {
 899         int retval = YAFFS_OK;
 900         __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
 901         yaffs_ExtendedTags tags;
 902         int result;
 903
 904         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
 905
 906         if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
 907                 retval = YAFFS_FAIL;
 908
 909         if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
 910                 T(YAFFS_TRACE_NANDACCESS,
 911                   (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
 912                 retval = YAFFS_FAIL;
 913         }
 914
 915         yaffs_ReleaseTempBuffer(dev, data, __LINE__);
 916
 917         return retval;
 918
 919 }
 920
 921 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
 922                                         const __u8 *data,
 923                                         yaffs_ExtendedTags *tags,
 924                                         int useReserve)
 925 {
 926         int attempts = 0;
 927         int writeOk = 0;
 928         int chunk;
 929
 930         yaffs_InvalidateCheckpoint(dev);
 931
 932         do {
 933                 yaffs_BlockInfo *bi = 0;
 934                 int erasedOk = 0;
 935
 936                 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
 937                 if (chunk < 0) {
 938                         /* no space */
 939                         break;
 940                 }
 941
 942                 /* First check this chunk is erased, if it needs
 943                  * checking.  The checking policy (unless forced
 944                  * always on) is as follows:
 945                  *
 946                  * Check the first page we try to write in a block.
 947                  * If the check passes then we don't need to check any
 948                  * more.        If the check fails, we check again...
 949                  * If the block has been erased, we don't need to check.
 950                  *
 951                  * However, if the block has been prioritised for gc,
 952                  * then we think there might be something odd about
 953                  * this block and stop using it.
 954                  *
 955                  * Rationale: We should only ever see chunks that have
 956                  * not been erased if there was a partially written
 957                  * chunk due to power loss.  This checking policy should
 958                  * catch that case with very few checks and thus save a
 959                  * lot of checks that are most likely not needed.
 960                  */
 961                 if (bi->gcPrioritise) {
 962                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
 963                         /* try another chunk */
 964                         continue;
 965                 }
 966
 967                 /* let's give it a try */
 968                 attempts++;
 969
 970 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
 971                 bi->skipErasedCheck = 0;
 972 #endif
 973                 if (!bi->skipErasedCheck) {
 974                         erasedOk = yaffs_CheckChunkErased(dev, chunk);
 975                         if (erasedOk != YAFFS_OK) {
 976                                 T(YAFFS_TRACE_ERROR,
 977                                 (TSTR("**>> yaffs chunk %d was not erased"
 978                                 TENDSTR), chunk));
 979
 980                                 /* try another chunk */
 981                                 continue;
 982                         }
 983                         bi->skipErasedCheck = 1;
 984                 }
 985
 986                 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
 987                                 data, tags);
 988                 if (writeOk != YAFFS_OK) {
 989                         yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
 990                         /* try another chunk */
 991                         continue;
 992                 }
 993
 994                 /* Copy the data into the robustification buffer */
 995                 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
 996
 997         } while (writeOk != YAFFS_OK &&
 998                 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
 999
1000         if (!writeOk)
1001                 chunk = -1;
1002
1003         if (attempts > 1) {
1004                 T(YAFFS_TRACE_ERROR,
1005                         (TSTR("**>> yaffs write required %d attempts" TENDSTR),
1006                         attempts));
1007
1008                 dev->nRetriedWrites += (attempts - 1);
1009         }
1010
1011         return chunk;
1012 }
1013
1014 /*
1015  * Block retiring for handling a broken block.
1016  */
1017
1018 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
1019 {
1020         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1021
1022         yaffs_InvalidateCheckpoint(dev);
1023
1024         if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
1025                 if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
1026                         T(YAFFS_TRACE_ALWAYS, (TSTR(
1027                                 "yaffs: Failed to mark bad and erase block %d"
1028                                 TENDSTR), blockInNAND));
1029                 } else {
1030                         yaffs_ExtendedTags tags;
1031                         int chunkId = blockInNAND * dev->nChunksPerBlock;
1032
1033                         __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
1034
1035                         memset(buffer, 0xff, dev->nDataBytesPerChunk);
1036                         yaffs_InitialiseTags(&tags);
1037                         tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
1038                         if (dev->writeChunkWithTagsToNAND(dev, chunkId -
1039                                 dev->chunkOffset, buffer, &tags) != YAFFS_OK)
1040                                 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
1041                                         TCONT("write bad block marker to block %d")
1042                                         TENDSTR), blockInNAND));
1043
1044                         yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
1045                 }
1046         }
1047
1048         bi->blockState = YAFFS_BLOCK_STATE_DEAD;
1049         bi->gcPrioritise = 0;
1050         bi->needsRetiring = 0;
1051
1052         dev->nRetiredBlocks++;
1053 }
1054
1055 /*
1056  * Functions for robustisizing TODO
1057  *
1058  */
1059
1060 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
1061                                 const __u8 *data,
1062                                 const yaffs_ExtendedTags *tags)
1063 {
1064 }
1065
1066 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
1067                                 const yaffs_ExtendedTags *tags)
1068 {
1069 }
1070
1071 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1072 {
1073         if (!bi->gcPrioritise) {
1074                 bi->gcPrioritise = 1;
1075                 dev->hasPendingPrioritisedGCs = 1;
1076                 bi->chunkErrorStrikes++;
1077
1078                 if (bi->chunkErrorStrikes > 3) {
1079                         bi->needsRetiring = 1; /* Too many stikes, so retire this */
1080                         T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1081
1082                 }
1083         }
1084 }
1085
1086 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
1087                 int erasedOk)
1088 {
1089         int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
1090         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1091
1092         yaffs_HandleChunkError(dev, bi);
1093
1094         if (erasedOk) {
1095                 /* Was an actual write failure, so mark the block for retirement  */
1096                 bi->needsRetiring = 1;
1097                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1098                   (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1099         }
1100
1101         /* Delete the chunk */
1102         yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1103 }
1104
1105
1106 /*---------------- Name handling functions ------------*/
1107
1108 static __u16 yaffs_CalcNameSum(const YCHAR *name)
1109 {
1110         __u16 sum = 0;
1111         __u16 i = 1;
1112
1113         const YUCHAR *bname = (const YUCHAR *) name;
1114         if (bname) {
1115                 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1116
1117 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1118                         sum += yaffs_toupper(*bname) * i;
1119 #else
1120                         sum += (*bname) * i;
1121 #endif
1122                         i++;
1123                         bname++;
1124                 }
1125         }
1126         return sum;
1127 }
1128
1129 static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
1130 {
1131 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1132         memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
1133         if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH)
1134                 yaffs_strcpy(obj->shortName, name);
1135         else
1136                 obj->shortName[0] = _Y('\0');
1137 #endif
1138         obj->sum = yaffs_CalcNameSum(name);
1139 }
1140
1141 /*-------------------- TNODES -------------------
1142
1143  * List of spare tnodes
1144  * The list is hooked together using the first pointer
1145  * in the tnode.
1146  */
1147
1148 /* yaffs_CreateTnodes creates a bunch more tnodes and
1149  * adds them to the tnode free list.
1150  * Don't use this function directly
1151  */
1152
1153 static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
1154 {
1155         int i;
1156         int tnodeSize;
1157         yaffs_Tnode *newTnodes;
1158         __u8 *mem;
1159         yaffs_Tnode *curr;
1160         yaffs_Tnode *next;
1161         yaffs_TnodeList *tnl;
1162
1163         if (nTnodes < 1)
1164                 return YAFFS_OK;
1165
1166         /* Calculate the tnode size in bytes for variable width tnode support.
1167          * Must be a multiple of 32-bits  */
1168         tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1169
1170         if (tnodeSize < sizeof(yaffs_Tnode))
1171                 tnodeSize = sizeof(yaffs_Tnode);
1172
1173         /* make these things */
1174
1175         newTnodes = YMALLOC(nTnodes * tnodeSize);
1176         mem = (__u8 *)newTnodes;
1177
1178         if (!newTnodes) {
1179                 T(YAFFS_TRACE_ERROR,
1180                         (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1181                 return YAFFS_FAIL;
1182         }
1183
1184         /* Hook them into the free list */
1185 #if 0
1186         for (i = 0; i < nTnodes - 1; i++) {
1187                 newTnodes[i].internal[0] = &newTnodes[i + 1];
1188 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1189                 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1190 #endif
1191         }
1192
1193         newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1194 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1195         newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1196 #endif
1197         dev->freeTnodes = newTnodes;
1198 #else
1199         /* New hookup for wide tnodes */
1200         for (i = 0; i < nTnodes - 1; i++) {
1201                 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1202                 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1203                 curr->internal[0] = next;
1204         }
1205
1206         curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1207         curr->internal[0] = dev->freeTnodes;
1208         dev->freeTnodes = (yaffs_Tnode *)mem;
1209
1210 #endif
1211
1212
1213         dev->nFreeTnodes += nTnodes;
1214         dev->nTnodesCreated += nTnodes;
1215
1216         /* Now add this bunch of tnodes to a list for freeing up.
1217          * NB If we can't add this to the management list it isn't fatal
1218          * but it just means we can't free this bunch of tnodes later.
1219          */
1220
1221         tnl = YMALLOC(sizeof(yaffs_TnodeList));
1222         if (!tnl) {
1223                 T(YAFFS_TRACE_ERROR,
1224                   (TSTR
1225                    ("yaffs: Could not add tnodes to management list" TENDSTR)));
1226                    return YAFFS_FAIL;
1227         } else {
1228                 tnl->tnodes = newTnodes;
1229                 tnl->next = dev->allocatedTnodeList;
1230                 dev->allocatedTnodeList = tnl;
1231         }
1232
1233         T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1234
1235         return YAFFS_OK;
1236 }
1237
1238 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1239
1240 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device *dev)
1241 {
1242         yaffs_Tnode *tn = NULL;
1243
1244         /* If there are none left make more */
1245         if (!dev->freeTnodes)
1246                 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1247
1248         if (dev->freeTnodes) {
1249                 tn = dev->freeTnodes;
1250 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1251                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1252                         /* Hoosterman, this thing looks like it isn't in the list */
1253                         T(YAFFS_TRACE_ALWAYS,
1254                           (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1255                 }
1256 #endif
1257                 dev->freeTnodes = dev->freeTnodes->internal[0];
1258                 dev->nFreeTnodes--;
1259         }
1260
1261         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1262
1263         return tn;
1264 }
1265
1266 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
1267 {
1268         yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1269         int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1270
1271         if (tnodeSize < sizeof(yaffs_Tnode))
1272                 tnodeSize = sizeof(yaffs_Tnode);
1273
1274         if (tn)
1275                 memset(tn, 0, tnodeSize);
1276
1277         return tn;
1278 }
1279
1280 /* FreeTnode frees up a tnode and puts it back on the free list */
1281 static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
1282 {
1283         if (tn) {
1284 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1285                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1286                         /* Hoosterman, this thing looks like it is already in the list */
1287                         T(YAFFS_TRACE_ALWAYS,
1288                           (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1289                 }
1290                 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1291 #endif
1292                 tn->internal[0] = dev->freeTnodes;
1293                 dev->freeTnodes = tn;
1294                 dev->nFreeTnodes++;
1295         }
1296         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1297 }
1298
1299 static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
1300 {
1301         /* Free the list of allocated tnodes */
1302         yaffs_TnodeList *tmp;
1303
1304         while (dev->allocatedTnodeList) {
1305                 tmp = dev->allocatedTnodeList->next;
1306
1307                 YFREE(dev->allocatedTnodeList->tnodes);
1308                 YFREE(dev->allocatedTnodeList);
1309                 dev->allocatedTnodeList = tmp;
1310
1311         }
1312
1313         dev->freeTnodes = NULL;
1314         dev->nFreeTnodes = 0;
1315 }
1316
1317 static void yaffs_InitialiseTnodes(yaffs_Device *dev)
1318 {
1319         dev->allocatedTnodeList = NULL;
1320         dev->freeTnodes = NULL;
1321         dev->nFreeTnodes = 0;
1322         dev->nTnodesCreated = 0;
1323 }
1324
1325
1326 void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
1327                 unsigned val)
1328 {
1329         __u32 *map = (__u32 *)tn;
1330         __u32 bitInMap;
1331         __u32 bitInWord;
1332         __u32 wordInMap;
1333         __u32 mask;
1334
1335         pos &= YAFFS_TNODES_LEVEL0_MASK;
1336         val >>= dev->chunkGroupBits;
1337
1338         bitInMap = pos * dev->tnodeWidth;
1339         wordInMap = bitInMap / 32;
1340         bitInWord = bitInMap & (32 - 1);
1341
1342         mask = dev->tnodeMask << bitInWord;
1343
1344         map[wordInMap] &= ~mask;
1345         map[wordInMap] |= (mask & (val << bitInWord));
1346
1347         if (dev->tnodeWidth > (32 - bitInWord)) {
1348                 bitInWord = (32 - bitInWord);
1349                 wordInMap++;;
1350                 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1351                 map[wordInMap] &= ~mask;
1352                 map[wordInMap] |= (mask & (val >> bitInWord));
1353         }
1354 }
1355
1356 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
1357                 unsigned pos)
1358 {
1359         __u32 *map = (__u32 *)tn;
1360         __u32 bitInMap;
1361         __u32 bitInWord;
1362         __u32 wordInMap;
1363         __u32 val;
1364
1365         pos &= YAFFS_TNODES_LEVEL0_MASK;
1366
1367         bitInMap = pos * dev->tnodeWidth;
1368         wordInMap = bitInMap / 32;
1369         bitInWord = bitInMap & (32 - 1);
1370
1371         val = map[wordInMap] >> bitInWord;
1372
1373         if      (dev->tnodeWidth > (32 - bitInWord)) {
1374                 bitInWord = (32 - bitInWord);
1375                 wordInMap++;;
1376                 val |= (map[wordInMap] << bitInWord);
1377         }
1378
1379         val &= dev->tnodeMask;
1380         val <<= dev->chunkGroupBits;
1381
1382         return val;
1383 }
1384
1385 /* ------------------- End of individual tnode manipulation -----------------*/
1386
1387 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1388  * The look up tree is represented by the top tnode and the number of topLevel
1389  * in the tree. 0 means only the level 0 tnode is in the tree.
1390  */
1391
1392 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1393 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
1394                                         yaffs_FileStructure *fStruct,
1395                                         __u32 chunkId)
1396 {
1397         yaffs_Tnode *tn = fStruct->top;
1398         __u32 i;
1399         int requiredTallness;
1400         int level = fStruct->topLevel;
1401
1402         /* Check sane level and chunk Id */
1403         if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
1404                 return NULL;
1405
1406         if (chunkId > YAFFS_MAX_CHUNK_ID)
1407                 return NULL;
1408
1409         /* First check we're tall enough (ie enough topLevel) */
1410
1411         i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1412         requiredTallness = 0;
1413         while (i) {
1414                 i >>= YAFFS_TNODES_INTERNAL_BITS;
1415                 requiredTallness++;
1416         }
1417
1418         if (requiredTallness > fStruct->topLevel)
1419                 return NULL; /* Not tall enough, so we can't find it */
1420
1421         /* Traverse down to level 0 */
1422         while (level > 0 && tn) {
1423                 tn = tn->internal[(chunkId >>
1424                         (YAFFS_TNODES_LEVEL0_BITS +
1425                                 (level - 1) *
1426                                 YAFFS_TNODES_INTERNAL_BITS)) &
1427                         YAFFS_TNODES_INTERNAL_MASK];
1428                 level--;
1429         }
1430
1431         return tn;
1432 }
1433
1434 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1435  * This happens in two steps:
1436  *  1. If the tree isn't tall enough, then make it taller.
1437  *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1438  *
1439  * Used when modifying the tree.
1440  *
1441  *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1442  *  be plugged into the ttree.
1443  */
1444
1445 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
1446                                         yaffs_FileStructure *fStruct,
1447                                         __u32 chunkId,
1448                                         yaffs_Tnode *passedTn)
1449 {
1450         int requiredTallness;
1451         int i;
1452         int l;
1453         yaffs_Tnode *tn;
1454
1455         __u32 x;
1456
1457
1458         /* Check sane level and page Id */
1459         if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
1460                 return NULL;
1461
1462         if (chunkId > YAFFS_MAX_CHUNK_ID)
1463                 return NULL;
1464
1465         /* First check we're tall enough (ie enough topLevel) */
1466
1467         x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1468         requiredTallness = 0;
1469         while (x) {
1470                 x >>= YAFFS_TNODES_INTERNAL_BITS;
1471                 requiredTallness++;
1472         }
1473
1474
1475         if (requiredTallness > fStruct->topLevel) {
1476                 /* Not tall enough, gotta make the tree taller */
1477                 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1478
1479                         tn = yaffs_GetTnode(dev);
1480
1481                         if (tn) {
1482                                 tn->internal[0] = fStruct->top;
1483                                 fStruct->top = tn;
1484                                 fStruct->topLevel++;
1485                         } else {
1486                                 T(YAFFS_TRACE_ERROR,
1487                                         (TSTR("yaffs: no more tnodes" TENDSTR)));
1488                                 return NULL;
1489                         }
1490                 }
1491         }
1492
1493         /* Traverse down to level 0, adding anything we need */
1494
1495         l = fStruct->topLevel;
1496         tn = fStruct->top;
1497
1498         if (l > 0) {
1499                 while (l > 0 && tn) {
1500                         x = (chunkId >>
1501                              (YAFFS_TNODES_LEVEL0_BITS +
1502                               (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1503                             YAFFS_TNODES_INTERNAL_MASK;
1504
1505
1506                         if ((l > 1) && !tn->internal[x]) {
1507                                 /* Add missing non-level-zero tnode */
1508                                 tn->internal[x] = yaffs_GetTnode(dev);
1509                                 if(!tn->internal[x])
1510                                         return NULL;
1511
1512                         } else if (l == 1) {
1513                                 /* Looking from level 1 at level 0 */
1514                                 if (passedTn) {
1515                                         /* If we already have one, then release it.*/
1516                                         if (tn->internal[x])
1517                                                 yaffs_FreeTnode(dev, tn->internal[x]);
1518                                         tn->internal[x] = passedTn;
1519
1520                                 } else if (!tn->internal[x]) {
1521                                         /* Don't have one, none passed in */
1522                                         tn->internal[x] = yaffs_GetTnode(dev);
1523                                         if(!tn->internal[x])
1524                                                 return NULL;
1525                                 }
1526                         }
1527
1528                         tn = tn->internal[x];
1529                         l--;
1530                 }
1531         } else {
1532                 /* top is level 0 */
1533                 if (passedTn) {
1534                         memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1535                         yaffs_FreeTnode(dev, passedTn);
1536                 }
1537         }
1538
1539         return tn;
1540 }
1541
1542 static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
1543                                 yaffs_ExtendedTags *tags, int objectId,
1544                                 int chunkInInode)
1545 {
1546         int j;
1547
1548         for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1549                 if (yaffs_CheckChunkBit(dev, theChunk / dev->nChunksPerBlock,
1550                                 theChunk % dev->nChunksPerBlock)) {
1551
1552                         if(dev->chunkGroupSize == 1)
1553                                 return theChunk;
1554                         else {
1555                                 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1556                                                                 tags);
1557                                 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1558                                         /* found it; */
1559                                         return theChunk;
1560                                 }
1561                         }
1562                 }
1563                 theChunk++;
1564         }
1565         return -1;
1566 }
1567
1568
1569 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1570  * chunks and tnodes in the file
1571  * Returns 1 if the tree was deleted.
1572  * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1573  */
1574
1575 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
1576                               int chunkOffset, int *limit)
1577 {
1578         int i;
1579         int chunkInInode;
1580         int theChunk;
1581         yaffs_ExtendedTags tags;
1582         int foundChunk;
1583         yaffs_Device *dev = in->myDev;
1584
1585         int allDone = 1;
1586
1587         if (tn) {
1588                 if (level > 0) {
1589                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1590                              i--) {
1591                                 if (tn->internal[i]) {
1592                                         if (limit && (*limit) < 0) {
1593                                                 allDone = 0;
1594                                         } else {
1595                                                 allDone =
1596                                                         yaffs_DeleteWorker(in,
1597                                                                 tn->
1598                                                                 internal
1599                                                                 [i],
1600                                                                 level -
1601                                                                 1,
1602                                                                 (chunkOffset
1603                                                                         <<
1604                                                                         YAFFS_TNODES_INTERNAL_BITS)
1605                                                                 + i,
1606                                                                 limit);
1607                                         }
1608                                         if (allDone) {
1609                                                 yaffs_FreeTnode(dev,
1610                                                                 tn->
1611                                                                 internal[i]);
1612                                                 tn->internal[i] = NULL;
1613                                         }
1614                                 }
1615                         }
1616                         return (allDone) ? 1 : 0;
1617                 } else if (level == 0) {
1618                         int hitLimit = 0;
1619
1620                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1621                                         i--) {
1622                                 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1623                                 if (theChunk) {
1624
1625                                         chunkInInode = (chunkOffset <<
1626                                                 YAFFS_TNODES_LEVEL0_BITS) + i;
1627
1628                                         foundChunk =
1629                                                 yaffs_FindChunkInGroup(dev,
1630                                                                 theChunk,
1631                                                                 &tags,
1632                                                                 in->objectId,
1633                                                                 chunkInInode);
1634
1635                                         if (foundChunk > 0) {
1636                                                 yaffs_DeleteChunk(dev,
1637                                                                   foundChunk, 1,
1638                                                                   __LINE__);
1639                                                 in->nDataChunks--;
1640                                                 if (limit) {
1641                                                         *limit = *limit - 1;
1642                                                         if (*limit <= 0)
1643                                                                 hitLimit = 1;
1644                                                 }
1645
1646                                         }
1647
1648                                         yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1649                                 }
1650
1651                         }
1652                         return (i < 0) ? 1 : 0;
1653
1654                 }
1655
1656         }
1657
1658         return 1;
1659
1660 }
1661
1662 static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
1663 {
1664         yaffs_BlockInfo *theBlock;
1665
1666         T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1667
1668         theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1669         if (theBlock) {
1670                 theBlock->softDeletions++;
1671                 dev->nFreeChunks++;
1672         }
1673 }
1674
1675 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1676  * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1677  * of the tnode.
1678  * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1679  */
1680
1681 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
1682                                   __u32 level, int chunkOffset)
1683 {
1684         int i;
1685         int theChunk;
1686         int allDone = 1;
1687         yaffs_Device *dev = in->myDev;
1688
1689         if (tn) {
1690                 if (level > 0) {
1691
1692                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1693                              i--) {
1694                                 if (tn->internal[i]) {
1695                                         allDone =
1696                                             yaffs_SoftDeleteWorker(in,
1697                                                                    tn->
1698                                                                    internal[i],
1699                                                                    level - 1,
1700                                                                    (chunkOffset
1701                                                                     <<
1702                                                                     YAFFS_TNODES_INTERNAL_BITS)
1703                                                                    + i);
1704                                         if (allDone) {
1705                                                 yaffs_FreeTnode(dev,
1706                                                                 tn->
1707                                                                 internal[i]);
1708                                                 tn->internal[i] = NULL;
1709                                         } else {
1710                                                 /* Hoosterman... how could this happen? */
1711                                         }
1712                                 }
1713                         }
1714                         return (allDone) ? 1 : 0;
1715                 } else if (level == 0) {
1716
1717                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1718                                 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1719                                 if (theChunk) {
1720                                         /* Note this does not find the real chunk, only the chunk group.
1721                                          * We make an assumption that a chunk group is not larger than
1722                                          * a block.
1723                                          */
1724                                         yaffs_SoftDeleteChunk(dev, theChunk);
1725                                         yaffs_LoadLevel0Tnode(dev, tn, i, 0);
1726                                 }
1727
1728                         }
1729                         return 1;
1730
1731                 }
1732
1733         }
1734
1735         return 1;
1736
1737 }
1738
1739 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1740 {
1741         if (obj->deleted &&
1742             obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1743                 if (obj->nDataChunks <= 0) {
1744                         /* Empty file with no duplicate object headers, just delete it immediately */
1745                         yaffs_FreeTnode(obj->myDev,
1746                                         obj->variant.fileVariant.top);
1747                         obj->variant.fileVariant.top = NULL;
1748                         T(YAFFS_TRACE_TRACING,
1749                           (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1750                            obj->objectId));
1751                         yaffs_DoGenericObjectDeletion(obj);
1752                 } else {
1753                         yaffs_SoftDeleteWorker(obj,
1754                                                obj->variant.fileVariant.top,
1755                                                obj->variant.fileVariant.
1756                                                topLevel, 0);
1757                         obj->softDeleted = 1;
1758                 }
1759         }
1760 }
1761
1762 /* Pruning removes any part of the file structure tree that is beyond the
1763  * bounds of the file (ie that does not point to chunks).
1764  *
1765  * A file should only get pruned when its size is reduced.
1766  *
1767  * Before pruning, the chunks must be pulled from the tree and the
1768  * level 0 tnode entries must be zeroed out.
1769  * Could also use this for file deletion, but that's probably better handled
1770  * by a special case.
1771  */
1772
1773 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
1774                                 __u32 level, int del0)
1775 {
1776         int i;
1777         int hasData;
1778
1779         if (tn) {
1780                 hasData = 0;
1781
1782                 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1783                         if (tn->internal[i] && level > 0) {
1784                                 tn->internal[i] =
1785                                     yaffs_PruneWorker(dev, tn->internal[i],
1786                                                       level - 1,
1787                                                       (i == 0) ? del0 : 1);
1788                         }
1789
1790                         if (tn->internal[i])
1791                                 hasData++;
1792                 }
1793
1794                 if (hasData == 0 && del0) {
1795                         /* Free and return NULL */
1796
1797                         yaffs_FreeTnode(dev, tn);
1798                         tn = NULL;
1799                 }
1800
1801         }
1802
1803         return tn;
1804
1805 }
1806
1807 static int yaffs_PruneFileStructure(yaffs_Device *dev,
1808                                 yaffs_FileStructure *fStruct)
1809 {
1810         int i;
1811         int hasData;
1812         int done = 0;
1813         yaffs_Tnode *tn;
1814
1815         if (fStruct->topLevel > 0) {
1816                 fStruct->top =
1817                     yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1818
1819                 /* Now we have a tree with all the non-zero branches NULL but the height
1820                  * is the same as it was.
1821                  * Let's see if we can trim internal tnodes to shorten the tree.
1822                  * We can do this if only the 0th element in the tnode is in use
1823                  * (ie all the non-zero are NULL)
1824                  */
1825
1826                 while (fStruct->topLevel && !done) {
1827                         tn = fStruct->top;
1828
1829                         hasData = 0;
1830                         for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1831                                 if (tn->internal[i])
1832                                         hasData++;
1833                         }
1834
1835                         if (!hasData) {
1836                                 fStruct->top = tn->internal[0];
1837                                 fStruct->topLevel--;
1838                                 yaffs_FreeTnode(dev, tn);
1839                         } else {
1840                                 done = 1;
1841                         }
1842                 }
1843         }
1844
1845         return YAFFS_OK;
1846 }
1847
1848 /*-------------------- End of File Structure functions.-------------------*/
1849
1850 /* yaffs_CreateFreeObjects creates a bunch more objects and
1851  * adds them to the object free list.
1852  */
1853 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
1854 {
1855         int i;
1856         yaffs_Object *newObjects;
1857         yaffs_ObjectList *list;
1858
1859         if (nObjects < 1)
1860                 return YAFFS_OK;
1861
1862         /* make these things */
1863         newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1864         list = YMALLOC(sizeof(yaffs_ObjectList));
1865
1866         if (!newObjects || !list) {
1867                 if (newObjects){
1868                         YFREE(newObjects);
1869                         newObjects = NULL;
1870                 }
1871                 if (list){
1872                         YFREE(list);
1873                         list = NULL;
1874                 }
1875                 T(YAFFS_TRACE_ALLOCATE,
1876                   (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1877                 return YAFFS_FAIL;
1878         }
1879
1880         /* Hook them into the free list */
1881         for (i = 0; i < nObjects - 1; i++) {
1882                 newObjects[i].siblings.next =
1883                                 (struct ylist_head *)(&newObjects[i + 1]);
1884         }
1885
1886         newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1887         dev->freeObjects = newObjects;
1888         dev->nFreeObjects += nObjects;
1889         dev->nObjectsCreated += nObjects;
1890
1891         /* Now add this bunch of Objects to a list for freeing up. */
1892
1893         list->objects = newObjects;
1894         list->next = dev->allocatedObjectList;
1895         dev->allocatedObjectList = list;
1896
1897         return YAFFS_OK;
1898 }
1899
1900
1901 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1902 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
1903 {
1904         yaffs_Object *tn = NULL;
1905
1906 #ifdef VALGRIND_TEST
1907         tn = YMALLOC(sizeof(yaffs_Object));
1908 #else
1909         /* If there are none left make more */
1910         if (!dev->freeObjects)
1911                 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1912
1913         if (dev->freeObjects) {
1914                 tn = dev->freeObjects;
1915                 dev->freeObjects =
1916                         (yaffs_Object *) (dev->freeObjects->siblings.next);
1917                 dev->nFreeObjects--;
1918         }
1919 #endif
1920         if (tn) {
1921                 /* Now sweeten it up... */
1922
1923                 memset(tn, 0, sizeof(yaffs_Object));
1924                 tn->beingCreated = 1;
1925
1926                 tn->myDev = dev;
1927                 tn->hdrChunk = 0;
1928                 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1929                 YINIT_LIST_HEAD(&(tn->hardLinks));
1930                 YINIT_LIST_HEAD(&(tn->hashLink));
1931                 YINIT_LIST_HEAD(&tn->siblings);
1932
1933
1934                 /* Now make the directory sane */
1935                 if (dev->rootDir) {
1936                         tn->parent = dev->rootDir;
1937                         ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
1938                 }
1939
1940                 /* Add it to the lost and found directory.
1941                  * NB Can't put root or lostNFound in lostNFound so
1942                  * check if lostNFound exists first
1943                  */
1944                 if (dev->lostNFoundDir)
1945                         yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1946
1947                 tn->beingCreated = 0;
1948         }
1949
1950         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1951
1952         return tn;
1953 }
1954
1955 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
1956                                                __u32 mode)
1957 {
1958
1959         yaffs_Object *obj =
1960             yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1961         if (obj) {
1962                 obj->fake = 1;          /* it is fake so it might have no NAND presence... */
1963                 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1964                 obj->unlinkAllowed = 0; /* ... or unlink it */
1965                 obj->deleted = 0;
1966                 obj->unlinked = 0;
1967                 obj->yst_mode = mode;
1968                 obj->myDev = dev;
1969                 obj->hdrChunk = 0;      /* Not a valid chunk. */
1970         }
1971
1972         return obj;
1973
1974 }
1975
1976 static void yaffs_UnhashObject(yaffs_Object *tn)
1977 {
1978         int bucket;
1979         yaffs_Device *dev = tn->myDev;
1980
1981         /* If it is still linked into the bucket list, free from the list */
1982         if (!ylist_empty(&tn->hashLink)) {
1983                 ylist_del_init(&tn->hashLink);
1984                 bucket = yaffs_HashFunction(tn->objectId);
1985                 dev->objectBucket[bucket].count--;
1986         }
1987 }
1988
1989 /*  FreeObject frees up a Object and puts it back on the free list */
1990 static void yaffs_FreeObject(yaffs_Object *tn)
1991 {
1992         yaffs_Device *dev = tn->myDev;
1993
1994 #ifdef __KERNEL__
1995         T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
1996 #endif
1997
1998         if (tn->parent)
1999                 YBUG();
2000         if (!ylist_empty(&tn->siblings))
2001                 YBUG();
2002
2003
2004 #ifdef __KERNEL__
2005         if (tn->myInode) {
2006                 /* We're still hooked up to a cached inode.
2007                  * Don't delete now, but mark for later deletion
2008                  */
2009                 tn->deferedFree = 1;
2010                 return;
2011         }
2012 #endif
2013
2014         yaffs_UnhashObject(tn);
2015
2016 #ifdef VALGRIND_TEST
2017         YFREE(tn);
2018         tn = NULL;
2019 #else
2020         /* Link into the free list. */
2021         tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
2022         dev->freeObjects = tn;
2023         dev->nFreeObjects++;
2024 #endif
2025         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2026 }
2027
2028 #ifdef __KERNEL__
2029
2030 void yaffs_HandleDeferedFree(yaffs_Object *obj)
2031 {
2032         if (obj->deferedFree)
2033                 yaffs_FreeObject(obj);
2034 }
2035
2036 #endif
2037
2038 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
2039 {
2040         /* Free the list of allocated Objects */
2041
2042         yaffs_ObjectList *tmp;
2043
2044         while (dev->allocatedObjectList) {
2045                 tmp = dev->allocatedObjectList->next;
2046                 YFREE(dev->allocatedObjectList->objects);
2047                 YFREE(dev->allocatedObjectList);
2048
2049                 dev->allocatedObjectList = tmp;
2050         }
2051
2052         dev->freeObjects = NULL;
2053         dev->nFreeObjects = 0;
2054 }
2055
2056 static void yaffs_InitialiseObjects(yaffs_Device *dev)
2057 {
2058         int i;
2059
2060         dev->allocatedObjectList = NULL;
2061         dev->freeObjects = NULL;
2062         dev->nFreeObjects = 0;
2063
2064         for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2065                 YINIT_LIST_HEAD(&dev->objectBucket[i].list);
2066                 dev->objectBucket[i].count = 0;
2067         }
2068 }
2069
2070 static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
2071 {
2072         static int x;
2073         int i;
2074         int l = 999;
2075         int lowest = 999999;
2076
2077         /* First let's see if we can find one that's empty. */
2078
2079         for (i = 0; i < 10 && lowest > 0; i++) {
2080                 x++;
2081                 x %= YAFFS_NOBJECT_BUCKETS;
2082                 if (dev->objectBucket[x].count < lowest) {
2083                         lowest = dev->objectBucket[x].count;
2084                         l = x;
2085                 }
2086
2087         }
2088
2089         /* If we didn't find an empty list, then try
2090          * looking a bit further for a short one
2091          */
2092
2093         for (i = 0; i < 10 && lowest > 3; i++) {
2094                 x++;
2095                 x %= YAFFS_NOBJECT_BUCKETS;
2096                 if (dev->objectBucket[x].count < lowest) {
2097                         lowest = dev->objectBucket[x].count;
2098                         l = x;
2099                 }
2100
2101         }
2102
2103         return l;
2104 }
2105
2106 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
2107 {
2108         int bucket = yaffs_FindNiceObjectBucket(dev);
2109
2110         /* Now find an object value that has not already been taken
2111          * by scanning the list.
2112          */
2113
2114         int found = 0;
2115         struct ylist_head *i;
2116
2117         __u32 n = (__u32) bucket;
2118
2119         /* yaffs_CheckObjectHashSanity();  */
2120
2121         while (!found) {
2122                 found = 1;
2123                 n += YAFFS_NOBJECT_BUCKETS;
2124                 if (1 || dev->objectBucket[bucket].count > 0) {
2125                         ylist_for_each(i, &dev->objectBucket[bucket].list) {
2126                                 /* If there is already one in the list */
2127                                 if (i && ylist_entry(i, yaffs_Object,
2128                                                 hashLink)->objectId == n) {
2129                                         found = 0;
2130                                 }
2131                         }
2132                 }
2133         }
2134
2135         return n;
2136 }
2137
2138 static void yaffs_HashObject(yaffs_Object *in)
2139 {
2140         int bucket = yaffs_HashFunction(in->objectId);
2141         yaffs_Device *dev = in->myDev;
2142
2143         ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
2144         dev->objectBucket[bucket].count++;
2145 }
2146
2147 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
2148 {
2149         int bucket = yaffs_HashFunction(number);
2150         struct ylist_head *i;
2151         yaffs_Object *in;
2152
2153         ylist_for_each(i, &dev->objectBucket[bucket].list) {
2154                 /* Look if it is in the list */
2155                 if (i) {
2156                         in = ylist_entry(i, yaffs_Object, hashLink);
2157                         if (in->objectId == number) {
2158 #ifdef __KERNEL__
2159                                 /* Don't tell the VFS about this one if it is defered free */
2160                                 if (in->deferedFree)
2161                                         return NULL;
2162 #endif
2163
2164                                 return in;
2165                         }
2166                 }
2167         }
2168
2169         return NULL;
2170 }
2171
2172 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
2173                                     yaffs_ObjectType type)
2174 {
2175         yaffs_Object *theObject;
2176         yaffs_Tnode *tn = NULL;
2177
2178         if (number < 0)
2179                 number = yaffs_CreateNewObjectNumber(dev);
2180
2181         if (type == YAFFS_OBJECT_TYPE_FILE) {
2182                 tn = yaffs_GetTnode(dev);
2183                 if (!tn)
2184                         return NULL;
2185         }
2186
2187         theObject = yaffs_AllocateEmptyObject(dev);
2188         if (!theObject){
2189                 if(tn)
2190                         yaffs_FreeTnode(dev,tn);
2191                 return NULL;
2192         }
2193
2194
2195         if (theObject) {
2196                 theObject->fake = 0;
2197                 theObject->renameAllowed = 1;
2198                 theObject->unlinkAllowed = 1;
2199                 theObject->objectId = number;
2200                 yaffs_HashObject(theObject);
2201                 theObject->variantType = type;
2202 #ifdef CONFIG_YAFFS_WINCE
2203                 yfsd_WinFileTimeNow(theObject->win_atime);
2204                 theObject->win_ctime[0] = theObject->win_mtime[0] =
2205                     theObject->win_atime[0];
2206                 theObject->win_ctime[1] = theObject->win_mtime[1] =
2207                     theObject->win_atime[1];
2208
2209 #else
2210
2211                 theObject->yst_atime = theObject->yst_mtime =
2212                     theObject->yst_ctime = Y_CURRENT_TIME;
2213 #endif
2214                 switch (type) {
2215                 case YAFFS_OBJECT_TYPE_FILE:
2216                         theObject->variant.fileVariant.fileSize = 0;
2217                         theObject->variant.fileVariant.scannedFileSize = 0;
2218                         theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2219                         theObject->variant.fileVariant.topLevel = 0;
2220                         theObject->variant.fileVariant.top = tn;
2221                         break;
2222                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2223                         YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2224                                         children);
2225                         break;
2226                 case YAFFS_OBJECT_TYPE_SYMLINK:
2227                 case YAFFS_OBJECT_TYPE_HARDLINK:
2228                 case YAFFS_OBJECT_TYPE_SPECIAL:
2229                         /* No action required */
2230                         break;
2231                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2232                         /* todo this should not happen */
2233                         break;
2234                 }
2235         }
2236
2237         return theObject;
2238 }
2239
2240 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
2241                                                       int number,
2242                                                       yaffs_ObjectType type)
2243 {
2244         yaffs_Object *theObject = NULL;
2245
2246         if (number > 0)
2247                 theObject = yaffs_FindObjectByNumber(dev, number);
2248
2249         if (!theObject)
2250                 theObject = yaffs_CreateNewObject(dev, number, type);
2251
2252         return theObject;
2253
2254 }
2255
2256
2257 static YCHAR *yaffs_CloneString(const YCHAR *str)
2258 {
2259         YCHAR *newStr = NULL;
2260
2261         if (!str)
2262                 str = _Y("");
2263
2264         newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
2265         if (newStr)
2266                 yaffs_strcpy(newStr, str);
2267
2268         return newStr;
2269
2270 }
2271
2272 /*
2273  * Mknod (create) a new object.
2274  * equivalentObject only has meaning for a hard link;
2275  * aliasString only has meaning for a symlink.
2276  * rdev only has meaning for devices (a subset of special objects)
2277  */
2278
2279 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2280                                        yaffs_Object *parent,
2281                                        const YCHAR *name,
2282                                        __u32 mode,
2283                                        __u32 uid,
2284                                        __u32 gid,
2285                                        yaffs_Object *equivalentObject,
2286                                        const YCHAR *aliasString, __u32 rdev)
2287 {
2288         yaffs_Object *in;
2289         YCHAR *str = NULL;
2290
2291         yaffs_Device *dev = parent->myDev;
2292
2293         /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2294         if (yaffs_FindObjectByName(parent, name))
2295                 return NULL;
2296
2297         if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2298                 str = yaffs_CloneString(aliasString);
2299                 if (!str)
2300                         return NULL;
2301         }
2302
2303         in = yaffs_CreateNewObject(dev, -1, type);
2304
2305         if (!in){
2306                 if(str)
2307                         YFREE(str);
2308                 return NULL;
2309         }
2310
2311
2312
2313
2314         if (in) {
2315                 in->hdrChunk = 0;
2316                 in->valid = 1;
2317                 in->variantType = type;
2318
2319                 in->yst_mode = mode;
2320
2321 #ifdef CONFIG_YAFFS_WINCE
2322                 yfsd_WinFileTimeNow(in->win_atime);
2323                 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2324                 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2325
2326 #else
2327                 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2328
2329                 in->yst_rdev = rdev;
2330                 in->yst_uid = uid;
2331                 in->yst_gid = gid;
2332 #endif
2333                 in->nDataChunks = 0;
2334
2335                 yaffs_SetObjectName(in, name);
2336                 in->dirty = 1;
2337
2338                 yaffs_AddObjectToDirectory(parent, in);
2339
2340                 in->myDev = parent->myDev;
2341
2342                 switch (type) {
2343                 case YAFFS_OBJECT_TYPE_SYMLINK:
2344                         in->variant.symLinkVariant.alias = str;
2345                         break;
2346                 case YAFFS_OBJECT_TYPE_HARDLINK:
2347                         in->variant.hardLinkVariant.equivalentObject =
2348                                 equivalentObject;
2349                         in->variant.hardLinkVariant.equivalentObjectId =
2350                                 equivalentObject->objectId;
2351                         ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
2352                         break;
2353                 case YAFFS_OBJECT_TYPE_FILE:
2354                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2355                 case YAFFS_OBJECT_TYPE_SPECIAL:
2356                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2357                         /* do nothing */
2358                         break;
2359                 }
2360
2361                 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2362                         /* Could not create the object header, fail the creation */
2363                         yaffs_DeleteObject(in);
2364                         in = NULL;
2365                 }
2366
2367                 yaffs_UpdateParent(parent);
2368         }
2369
2370         return in;
2371 }
2372
2373 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
2374                         __u32 mode, __u32 uid, __u32 gid)
2375 {
2376         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2377                                 uid, gid, NULL, NULL, 0);
2378 }
2379
2380 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
2381                                 __u32 mode, __u32 uid, __u32 gid)
2382 {
2383         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2384                                  mode, uid, gid, NULL, NULL, 0);
2385 }
2386
2387 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
2388                                 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2389 {
2390         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2391                                  uid, gid, NULL, NULL, rdev);
2392 }
2393
2394 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
2395                                 __u32 mode, __u32 uid, __u32 gid,
2396                                 const YCHAR *alias)
2397 {
2398         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2399                                 uid, gid, NULL, alias, 0);
2400 }
2401
2402 /* yaffs_Link returns the object id of the equivalent object.*/
2403 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
2404                         yaffs_Object *equivalentObject)
2405 {
2406         /* Get the real object in case we were fed a hard link as an equivalent object */
2407         equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2408
2409         if (yaffs_MknodObject
2410             (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2411              equivalentObject, NULL, 0)) {
2412                 return equivalentObject;
2413         } else {
2414                 return NULL;
2415         }
2416
2417 }
2418
2419 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
2420                                 const YCHAR *newName, int force, int shadows)
2421 {
2422         int unlinkOp;
2423         int deleteOp;
2424
2425         yaffs_Object *existingTarget;
2426
2427         if (newDir == NULL)
2428                 newDir = obj->parent;   /* use the old directory */
2429
2430         if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2431                 T(YAFFS_TRACE_ALWAYS,
2432                   (TSTR
2433                    ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
2434                     TENDSTR)));
2435                 YBUG();
2436         }
2437
2438         /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2439         if (obj->myDev->isYaffs2)
2440                 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2441         else
2442                 unlinkOp = (newDir == obj->myDev->unlinkedDir
2443                             && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2444
2445         deleteOp = (newDir == obj->myDev->deletedDir);
2446
2447         existingTarget = yaffs_FindObjectByName(newDir, newName);
2448
2449         /* If the object is a file going into the unlinked directory,
2450          *   then it is OK to just stuff it in since duplicate names are allowed.
2451          *   else only proceed if the new name does not exist and if we're putting
2452          *   it into a directory.
2453          */
2454         if ((unlinkOp ||
2455              deleteOp ||
2456              force ||
2457              (shadows > 0) ||
2458              !existingTarget) &&
2459             newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2460                 yaffs_SetObjectName(obj, newName);
2461                 obj->dirty = 1;
2462
2463                 yaffs_AddObjectToDirectory(newDir, obj);
2464
2465                 if (unlinkOp)
2466                         obj->unlinked = 1;
2467
2468                 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2469                 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
2470                         return YAFFS_OK;
2471         }
2472
2473         return YAFFS_FAIL;
2474 }
2475
2476 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
2477                 yaffs_Object *newDir, const YCHAR *newName)
2478 {
2479         yaffs_Object *obj = NULL;
2480         yaffs_Object *existingTarget = NULL;
2481         int force = 0;
2482         int result;
2483         yaffs_Device *dev;
2484
2485
2486         if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2487                 YBUG();
2488         if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2489                 YBUG();
2490
2491         dev = oldDir->myDev;
2492
2493 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2494         /* Special case for case insemsitive systems (eg. WinCE).
2495          * While look-up is case insensitive, the name isn't.
2496          * Therefore we might want to change x.txt to X.txt
2497         */
2498         if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
2499                 force = 1;
2500 #endif
2501
2502         if(yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
2503                 /* ENAMETOOLONG */
2504                 return YAFFS_FAIL;
2505
2506         obj = yaffs_FindObjectByName(oldDir, oldName);
2507
2508         if (obj && obj->renameAllowed) {
2509
2510                 /* Now do the handling for an existing target, if there is one */
2511
2512                 existingTarget = yaffs_FindObjectByName(newDir, newName);
2513                 if (existingTarget &&
2514                         existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2515                         !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
2516                         /* There is a target that is a non-empty directory, so we fail */
2517                         return YAFFS_FAIL;      /* EEXIST or ENOTEMPTY */
2518                 } else if (existingTarget && existingTarget != obj) {
2519                         /* Nuke the target first, using shadowing,
2520                          * but only if it isn't the same object.
2521                          *
2522                          * Note we must disable gc otherwise it can mess up the shadowing.
2523                          *
2524                          */
2525                         dev->isDoingGC=1;
2526                         yaffs_ChangeObjectName(obj, newDir, newName, force,
2527                                                 existingTarget->objectId);
2528                         existingTarget->isShadowed = 1;
2529                         yaffs_UnlinkObject(existingTarget);
2530                         dev->isDoingGC=0;
2531                 }
2532
2533                 result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2534
2535                 yaffs_UpdateParent(oldDir);
2536                 if(newDir != oldDir)
2537                         yaffs_UpdateParent(newDir);
2538
2539                 return result;
2540         }
2541         return YAFFS_FAIL;
2542 }
2543
2544 /*------------------------- Block Management and Page Allocation ----------------*/
2545
2546 static int yaffs_InitialiseBlocks(yaffs_Device *dev)
2547 {
2548         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2549
2550         dev->blockInfo = NULL;
2551         dev->chunkBits = NULL;
2552
2553         dev->allocationBlock = -1;      /* force it to get a new one */
2554
2555         /* If the first allocation strategy fails, thry the alternate one */
2556         dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2557         if (!dev->blockInfo) {
2558                 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2559                 dev->blockInfoAlt = 1;
2560         } else
2561                 dev->blockInfoAlt = 0;
2562
2563         if (dev->blockInfo) {
2564                 /* Set up dynamic blockinfo stuff. */
2565                 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
2566                 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2567                 if (!dev->chunkBits) {
2568                         dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2569                         dev->chunkBitsAlt = 1;
2570                 } else
2571                         dev->chunkBitsAlt = 0;
2572         }
2573
2574         if (dev->blockInfo && dev->chunkBits) {
2575                 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2576                 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2577                 return YAFFS_OK;
2578         }
2579
2580         return YAFFS_FAIL;
2581 }
2582
2583 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2584 {
2585         if (dev->blockInfoAlt && dev->blockInfo)
2586                 YFREE_ALT(dev->blockInfo);
2587         else if (dev->blockInfo)
2588                 YFREE(dev->blockInfo);
2589
2590         dev->blockInfoAlt = 0;
2591
2592         dev->blockInfo = NULL;
2593
2594         if (dev->chunkBitsAlt && dev->chunkBits)
2595                 YFREE_ALT(dev->chunkBits);
2596         else if (dev->chunkBits)
2597                 YFREE(dev->chunkBits);
2598         dev->chunkBitsAlt = 0;
2599         dev->chunkBits = NULL;
2600 }
2601
2602 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
2603                                         yaffs_BlockInfo *bi)
2604 {
2605         int i;
2606         __u32 seq;
2607         yaffs_BlockInfo *b;
2608
2609         if (!dev->isYaffs2)
2610                 return 1;       /* disqualification only applies to yaffs2. */
2611
2612         if (!bi->hasShrinkHeader)
2613                 return 1;       /* can gc */
2614
2615         /* Find the oldest dirty sequence number if we don't know it and save it
2616          * so we don't have to keep recomputing it.
2617          */
2618         if (!dev->oldestDirtySequence) {
2619                 seq = dev->sequenceNumber;
2620
2621                 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2622                                 i++) {
2623                         b = yaffs_GetBlockInfo(dev, i);
2624                         if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2625                             (b->pagesInUse - b->softDeletions) <
2626                             dev->nChunksPerBlock && b->sequenceNumber < seq) {
2627                                 seq = b->sequenceNumber;
2628                         }
2629                 }
2630                 dev->oldestDirtySequence = seq;
2631         }
2632
2633         /* Can't do gc of this block if there are any blocks older than this one that have
2634          * discarded pages.
2635          */
2636         return (bi->sequenceNumber <= dev->oldestDirtySequence);
2637 }
2638
2639 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
2640  * for garbage collection.
2641  */
2642
2643 static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
2644                                         int aggressive)
2645 {
2646         int b = dev->currentDirtyChecker;
2647
2648         int i;
2649         int iterations;
2650         int dirtiest = -1;
2651         int pagesInUse = 0;
2652         int prioritised = 0;
2653         yaffs_BlockInfo *bi;
2654         int pendingPrioritisedExist = 0;
2655
2656         /* First let's see if we need to grab a prioritised block */
2657         if (dev->hasPendingPrioritisedGCs) {
2658                 for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
2659
2660                         bi = yaffs_GetBlockInfo(dev, i);
2661                         /* yaffs_VerifyBlock(dev,bi,i); */
2662
2663                         if (bi->gcPrioritise) {
2664                                 pendingPrioritisedExist = 1;
2665                                 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2666                                    yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2667                                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2668                                         dirtiest = i;
2669                                         prioritised = 1;
2670                                         aggressive = 1; /* Fool the non-aggressive skip logiv below */
2671                                 }
2672                         }
2673                 }
2674
2675                 if (!pendingPrioritisedExist) /* None found, so we can clear this */
2676                         dev->hasPendingPrioritisedGCs = 0;
2677         }
2678
2679         /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2680          * search harder.
2681          * else (we're doing a leasurely gc), then we only bother to do this if the
2682          * block has only a few pages in use.
2683          */
2684
2685         dev->nonAggressiveSkip--;
2686
2687         if (!aggressive && (dev->nonAggressiveSkip > 0))
2688                 return -1;
2689
2690         if (!prioritised)
2691                 pagesInUse =
2692                         (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2693
2694         if (aggressive)
2695                 iterations =
2696                     dev->internalEndBlock - dev->internalStartBlock + 1;
2697         else {
2698                 iterations =
2699                     dev->internalEndBlock - dev->internalStartBlock + 1;
2700                 iterations = iterations / 16;
2701                 if (iterations > 200)
2702                         iterations = 200;
2703         }
2704
2705         for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2706                 b++;
2707                 if (b < dev->internalStartBlock || b > dev->internalEndBlock)
2708                         b = dev->internalStartBlock;
2709
2710                 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2711                         T(YAFFS_TRACE_ERROR,
2712                           (TSTR("**>> Block %d is not valid" TENDSTR), b));
2713                         YBUG();
2714                 }
2715
2716                 bi = yaffs_GetBlockInfo(dev, b);
2717
2718                 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2719                         (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2720                                 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2721                         dirtiest = b;
2722                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2723                 }
2724         }
2725
2726         dev->currentDirtyChecker = b;
2727
2728         if (dirtiest > 0) {
2729                 T(YAFFS_TRACE_GC,
2730                   (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2731                    dev->nChunksPerBlock - pagesInUse, prioritised));
2732         }
2733
2734         dev->oldestDirtySequence = 0;
2735
2736         if (dirtiest > 0)
2737                 dev->nonAggressiveSkip = 4;
2738
2739         return dirtiest;
2740 }
2741
2742 static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
2743 {
2744         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2745
2746         int erasedOk = 0;
2747
2748         /* If the block is still healthy erase it and mark as clean.
2749          * If the block has had a data failure, then retire it.
2750          */
2751
2752         T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2753                 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2754                 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2755
2756         bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2757
2758         if (!bi->needsRetiring) {
2759                 yaffs_InvalidateCheckpoint(dev);
2760                 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2761                 if (!erasedOk) {
2762                         dev->nErasureFailures++;
2763                         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2764                           (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2765                 }
2766         }
2767
2768         if (erasedOk &&
2769             ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2770                 int i;
2771                 for (i = 0; i < dev->nChunksPerBlock; i++) {
2772                         if (!yaffs_CheckChunkErased
2773                             (dev, blockNo * dev->nChunksPerBlock + i)) {
2774                                 T(YAFFS_TRACE_ERROR,
2775                                   (TSTR
2776                                    (">>Block %d erasure supposedly OK, but chunk %d not erased"
2777                                     TENDSTR), blockNo, i));
2778                         }
2779                 }
2780         }
2781
2782         if (erasedOk) {
2783                 /* Clean it up... */
2784                 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2785                 dev->nErasedBlocks++;
2786                 bi->pagesInUse = 0;
2787                 bi->softDeletions = 0;
2788                 bi->hasShrinkHeader = 0;
2789                 bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
2790                 bi->gcPrioritise = 0;
2791                 yaffs_ClearChunkBits(dev, blockNo);
2792
2793                 T(YAFFS_TRACE_ERASE,
2794                   (TSTR("Erased block %d" TENDSTR), blockNo));
2795         } else {
2796                 dev->nFreeChunks -= dev->nChunksPerBlock;       /* We lost a block of free space */
2797
2798                 yaffs_RetireBlock(dev, blockNo);
2799                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2800                   (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2801         }
2802 }
2803
2804 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2805 {
2806         int i;
2807
2808         yaffs_BlockInfo *bi;
2809
2810         if (dev->nErasedBlocks < 1) {
2811                 /* Hoosterman we've got a problem.
2812                  * Can't get space to gc
2813                  */
2814                 T(YAFFS_TRACE_ERROR,
2815                   (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
2816
2817                 return -1;
2818         }
2819
2820         /* Find an empty block. */
2821
2822         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2823                 dev->allocationBlockFinder++;
2824                 if (dev->allocationBlockFinder < dev->internalStartBlock
2825                     || dev->allocationBlockFinder > dev->internalEndBlock) {
2826                         dev->allocationBlockFinder = dev->internalStartBlock;
2827                 }
2828
2829                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2830
2831                 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2832                         bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2833                         dev->sequenceNumber++;
2834                         bi->sequenceNumber = dev->sequenceNumber;
2835                         dev->nErasedBlocks--;
2836                         T(YAFFS_TRACE_ALLOCATE,
2837                           (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
2838                            dev->allocationBlockFinder, dev->sequenceNumber,
2839                            dev->nErasedBlocks));
2840                         return dev->allocationBlockFinder;
2841                 }
2842         }
2843
2844         T(YAFFS_TRACE_ALWAYS,
2845           (TSTR
2846            ("yaffs tragedy: no more erased blocks, but there should have been %d"
2847             TENDSTR), dev->nErasedBlocks));
2848
2849         return -1;
2850 }
2851
2852
2853
2854 static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
2855 {
2856         if (!dev->nCheckpointBlocksRequired &&
2857            dev->isYaffs2) {
2858                 /* Not a valid value so recalculate */
2859                 int nBytes = 0;
2860                 int nBlocks;
2861                 int devBlocks = (dev->endBlock - dev->startBlock + 1);
2862                 int tnodeSize;
2863
2864                 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
2865
2866                 if (tnodeSize < sizeof(yaffs_Tnode))
2867                         tnodeSize = sizeof(yaffs_Tnode);
2868
2869                 nBytes += sizeof(yaffs_CheckpointValidity);
2870                 nBytes += sizeof(yaffs_CheckpointDevice);
2871                 nBytes += devBlocks * sizeof(yaffs_BlockInfo);
2872                 nBytes += devBlocks * dev->chunkBitmapStride;
2873                 nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
2874                 nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
2875                 nBytes += sizeof(yaffs_CheckpointValidity);
2876                 nBytes += sizeof(__u32); /* checksum*/
2877
2878                 /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
2879
2880                 nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->nChunksPerBlock)) + 3;
2881
2882                 dev->nCheckpointBlocksRequired = nBlocks;
2883         }
2884
2885         return dev->nCheckpointBlocksRequired;
2886 }
2887
2888 /*
2889  * Check if there's space to allocate...
2890  * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2891  */
2892 static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev)
2893 {
2894         int reservedChunks;
2895         int reservedBlocks = dev->nReservedBlocks;
2896         int checkpointBlocks;
2897
2898         if (dev->isYaffs2) {
2899                 checkpointBlocks =  yaffs_CalcCheckpointBlocksRequired(dev) -
2900                                     dev->blocksInCheckpoint;
2901                 if (checkpointBlocks < 0)
2902                         checkpointBlocks = 0;
2903         } else {
2904                 checkpointBlocks = 0;
2905         }
2906
2907         reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
2908
2909         return (dev->nFreeChunks > reservedChunks);
2910 }
2911
2912 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
2913                 yaffs_BlockInfo **blockUsedPtr)
2914 {
2915         int retVal;
2916         yaffs_BlockInfo *bi;
2917
2918         if (dev->allocationBlock < 0) {
2919                 /* Get next block to allocate off */
2920                 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2921                 dev->allocationPage = 0;
2922         }
2923
2924         if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2925                 /* Not enough space to allocate unless we're allowed to use the reserve. */
2926                 return -1;
2927         }
2928
2929         if (dev->nErasedBlocks < dev->nReservedBlocks
2930                         && dev->allocationPage == 0) {
2931                 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2932         }
2933
2934         /* Next page please.... */
2935         if (dev->allocationBlock >= 0) {
2936                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2937
2938                 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2939                         dev->allocationPage;
2940                 bi->pagesInUse++;
2941                 yaffs_SetChunkBit(dev, dev->allocationBlock,
2942                                 dev->allocationPage);
2943
2944                 dev->allocationPage++;
2945
2946                 dev->nFreeChunks--;
2947
2948                 /* If the block is full set the state to full */
2949                 if (dev->allocationPage >= dev->nChunksPerBlock) {
2950                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
2951                         dev->allocationBlock = -1;
2952                 }
2953
2954                 if (blockUsedPtr)
2955                         *blockUsedPtr = bi;
2956
2957                 return retVal;
2958         }
2959
2960         T(YAFFS_TRACE_ERROR,
2961                         (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2962
2963         return -1;
2964 }
2965
2966 static int yaffs_GetErasedChunks(yaffs_Device *dev)
2967 {
2968         int n;
2969
2970         n = dev->nErasedBlocks * dev->nChunksPerBlock;
2971
2972         if (dev->allocationBlock > 0)
2973                 n += (dev->nChunksPerBlock - dev->allocationPage);
2974
2975         return n;
2976
2977 }
2978
2979 static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
2980                 int wholeBlock)
2981 {
2982         int oldChunk;
2983         int newChunk;
2984         int markNAND;
2985         int retVal = YAFFS_OK;
2986         int cleanups = 0;
2987         int i;
2988         int isCheckpointBlock;
2989         int matchingChunk;
2990         int maxCopies;
2991
2992         int chunksBefore = yaffs_GetErasedChunks(dev);
2993         int chunksAfter;
2994
2995         yaffs_ExtendedTags tags;
2996
2997         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2998
2999         yaffs_Object *object;
3000
3001         isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
3002
3003
3004         T(YAFFS_TRACE_TRACING,
3005                         (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
3006                          block,
3007                          bi->pagesInUse,
3008                          bi->hasShrinkHeader,
3009                          wholeBlock));
3010
3011         /*yaffs_VerifyFreeChunks(dev); */
3012
3013         if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
3014                 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
3015
3016         bi->hasShrinkHeader = 0;        /* clear the flag so that the block can erase */
3017
3018         /* Take off the number of soft deleted entries because
3019          * they're going to get really deleted during GC.
3020          */
3021         if(dev->gcChunk == 0) /* first time through for this block */
3022                 dev->nFreeChunks -= bi->softDeletions;
3023
3024         dev->isDoingGC = 1;
3025
3026         if (isCheckpointBlock ||
3027                         !yaffs_StillSomeChunkBits(dev, block)) {
3028                 T(YAFFS_TRACE_TRACING,
3029                                 (TSTR
3030                                  ("Collecting block %d that has no chunks in use" TENDSTR),
3031                                  block));
3032                 yaffs_BlockBecameDirty(dev, block);
3033         } else {
3034
3035                 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
3036
3037                 yaffs_VerifyBlock(dev, bi, block);
3038
3039                 maxCopies = (wholeBlock) ? dev->nChunksPerBlock : 10;
3040                 oldChunk = block * dev->nChunksPerBlock + dev->gcChunk;
3041
3042                 for (/* init already done */;
3043                      retVal == YAFFS_OK &&
3044                      dev->gcChunk < dev->nChunksPerBlock &&
3045                      (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
3046                      maxCopies > 0;
3047                      dev->gcChunk++, oldChunk++) {
3048                         if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
3049
3050                                 /* This page is in use and might need to be copied off */
3051
3052                                 maxCopies--;
3053
3054                                 markNAND = 1;
3055
3056                                 yaffs_InitialiseTags(&tags);
3057
3058                                 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
3059                                                                 buffer, &tags);
3060
3061                                 object =
3062                                     yaffs_FindObjectByNumber(dev,
3063                                                              tags.objectId);
3064
3065                                 T(YAFFS_TRACE_GC_DETAIL,
3066                                   (TSTR
3067                                    ("Collecting chunk in block %d, %d %d %d " TENDSTR),
3068                                    dev->gcChunk, tags.objectId, tags.chunkId,
3069                                    tags.byteCount));
3070
3071                                 if (object && !yaffs_SkipVerification(dev)) {
3072                                         if (tags.chunkId == 0)
3073                                                 matchingChunk = object->hdrChunk;
3074                                         else if (object->softDeleted)
3075                                                 matchingChunk = oldChunk; /* Defeat the test */
3076                                         else
3077                                                 matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
3078
3079                                         if (oldChunk != matchingChunk)
3080                                                 T(YAFFS_TRACE_ERROR,
3081                                                   (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
3082                                                   oldChunk, matchingChunk, tags.objectId, tags.chunkId));
3083
3084                                 }
3085
3086                                 if (!object) {
3087                                         T(YAFFS_TRACE_ERROR,
3088                                           (TSTR
3089                                            ("page %d in gc has no object: %d %d %d "
3090                                             TENDSTR), oldChunk,
3091                                             tags.objectId, tags.chunkId, tags.byteCount));
3092                                 }
3093
3094                                 if (object &&
3095                                     object->deleted &&
3096                                     object->softDeleted &&
3097                                     tags.chunkId != 0) {
3098                                         /* Data chunk in a soft deleted file, throw it away
3099                                          * It's a soft deleted data chunk,
3100                                          * No need to copy this, just forget about it and
3101                                          * fix up the object.
3102                                          */
3103
3104                                         object->nDataChunks--;
3105
3106                                         if (object->nDataChunks <= 0) {
3107                                                 /* remeber to clean up the object */
3108                                                 dev->gcCleanupList[cleanups] =
3109                                                     tags.objectId;
3110                                                 cleanups++;
3111                                         }
3112                                         markNAND = 0;
3113                                 } else if (0) {
3114                                         /* Todo object && object->deleted && object->nDataChunks == 0 */
3115                                         /* Deleted object header with no data chunks.
3116                                          * Can be discarded and the file deleted.
3117                                          */
3118                                         object->hdrChunk = 0;
3119                                         yaffs_FreeTnode(object->myDev,
3120                                                         object->variant.
3121                                                         fileVariant.top);
3122                                         object->variant.fileVariant.top = NULL;
3123                                         yaffs_DoGenericObjectDeletion(object);
3124
3125                                 } else if (object) {
3126                                         /* It's either a data chunk in a live file or
3127                                          * an ObjectHeader, so we're interested in it.
3128                                          * NB Need to keep the ObjectHeaders of deleted files
3129                                          * until the whole file has been deleted off
3130                                          */
3131                                         tags.serialNumber++;
3132
3133                                         dev->nGCCopies++;
3134
3135                                         if (tags.chunkId == 0) {
3136                                                 /* It is an object Id,
3137                                                  * We need to nuke the shrinkheader flags first
3138                                                  * We no longer want the shrinkHeader flag since its work is done
3139                                                  * and if it is left in place it will mess up scanning.
3140                                                  */
3141
3142                                                 yaffs_ObjectHeader *oh;
3143                                                 oh = (yaffs_ObjectHeader *)buffer;
3144                                                 oh->isShrink = 0;
3145                                                 tags.extraIsShrinkHeader = 0;
3146
3147                                                 yaffs_VerifyObjectHeader(object, oh, &tags, 1);
3148                                         }
3149
3150                                         newChunk =
3151                                             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3152
3153                                         if (newChunk < 0) {
3154                                                 retVal = YAFFS_FAIL;
3155                                         } else {
3156
3157                                                 /* Ok, now fix up the Tnodes etc. */
3158
3159                                                 if (tags.chunkId == 0) {
3160                                                         /* It's a header */
3161                                                         object->hdrChunk =  newChunk;
3162                                                         object->serial =   tags.serialNumber;
3163                                                 } else {
3164                                                         /* It's a data chunk */
3165                                                         yaffs_PutChunkIntoFile
3166                                                             (object,
3167                                                              tags.chunkId,
3168                                                              newChunk, 0);
3169                                                 }
3170                                         }
3171                                 }
3172
3173                                 if (retVal == YAFFS_OK)
3174                                         yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3175
3176                         }
3177                 }
3178
3179                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3180
3181
3182                 /* Do any required cleanups */
3183                 for (i = 0; i < cleanups; i++) {
3184                         /* Time to delete the file too */
3185                         object =
3186                             yaffs_FindObjectByNumber(dev,
3187                                                      dev->gcCleanupList[i]);
3188                         if (object) {
3189                                 yaffs_FreeTnode(dev,
3190                                                 object->variant.fileVariant.
3191                                                 top);
3192                                 object->variant.fileVariant.top = NULL;
3193                                 T(YAFFS_TRACE_GC,
3194                                   (TSTR
3195                                    ("yaffs: About to finally delete object %d"
3196                                     TENDSTR), object->objectId));
3197                                 yaffs_DoGenericObjectDeletion(object);
3198                                 object->myDev->nDeletedFiles--;
3199                         }
3200
3201                 }
3202
3203         }
3204
3205         yaffs_VerifyCollectedBlock(dev, bi, block);
3206
3207         chunksAfter = yaffs_GetErasedChunks(dev);
3208         if (chunksBefore >= chunksAfter) {
3209                 T(YAFFS_TRACE_GC,
3210                   (TSTR
3211                    ("gc did not increase free chunks before %d after %d"
3212                     TENDSTR), chunksBefore, chunksAfter));
3213         }
3214
3215         /* If the gc completed then clear the current gcBlock so that we find another. */
3216         if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
3217                 dev->gcBlock = -1;
3218                 dev->gcChunk = 0;
3219         }
3220
3221         dev->isDoingGC = 0;
3222
3223         return retVal;
3224 }
3225
3226 /* New garbage collector
3227  * If we're very low on erased blocks then we do aggressive garbage collection
3228  * otherwise we do "leasurely" garbage collection.
3229  * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3230  * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3231  *
3232  * The idea is to help clear out space in a more spread-out manner.
3233  * Dunno if it really does anything useful.
3234  */
3235 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
3236 {
3237         int block;
3238         int aggressive;
3239         int gcOk = YAFFS_OK;
3240         int maxTries = 0;
3241
3242         int checkpointBlockAdjust;
3243
3244         if (dev->isDoingGC) {
3245                 /* Bail out so we don't get recursive gc */
3246                 return YAFFS_OK;
3247         }
3248
3249         /* This loop should pass the first time.
3250          * We'll only see looping here if the erase of the collected block fails.
3251          */
3252
3253         do {
3254                 maxTries++;
3255
3256                 checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
3257                 if (checkpointBlockAdjust < 0)
3258                         checkpointBlockAdjust = 0;
3259
3260                 if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
3261                         /* We need a block soon...*/
3262                         aggressive = 1;
3263                 } else {
3264                         /* We're in no hurry */
3265                         aggressive = 0;
3266                 }
3267
3268                 if (dev->gcBlock <= 0) {
3269                         dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3270                         dev->gcChunk = 0;
3271                 }
3272
3273                 block = dev->gcBlock;
3274
3275                 if (block > 0) {
3276                         dev->garbageCollections++;
3277                         if (!aggressive)
3278                                 dev->passiveGarbageCollections++;
3279
3280                         T(YAFFS_TRACE_GC,
3281                           (TSTR
3282                            ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3283                            dev->nErasedBlocks, aggressive));
3284
3285                         gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
3286                 }
3287
3288                 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
3289                         T(YAFFS_TRACE_GC,
3290                           (TSTR
3291                            ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3292                             TENDSTR), dev->nErasedBlocks, maxTries, block));
3293                 }
3294         } while ((dev->nErasedBlocks < dev->nReservedBlocks) &&
3295                  (block > 0) &&
3296                  (maxTries < 2));
3297
3298         return aggressive ? gcOk : YAFFS_OK;
3299 }
3300
3301 /*-------------------------  TAGS --------------------------------*/
3302
3303 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
3304                            int chunkInObject)
3305 {
3306         return (tags->chunkId == chunkInObject &&
3307                 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3308
3309 }
3310
3311
3312 /*-------------------- Data file manipulation -----------------*/
3313
3314 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
3315                                  yaffs_ExtendedTags *tags)
3316 {
3317         /*Get the Tnode, then get the level 0 offset chunk offset */
3318         yaffs_Tnode *tn;
3319         int theChunk = -1;
3320         yaffs_ExtendedTags localTags;
3321         int retVal = -1;
3322
3323         yaffs_Device *dev = in->myDev;
3324
3325         if (!tags) {
3326                 /* Passed a NULL, so use our own tags space */
3327                 tags = &localTags;
3328         }
3329
3330         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3331
3332         if (tn) {
3333                 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3334
3335                 retVal =
3336                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3337                                            chunkInInode);
3338         }
3339         return retVal;
3340 }
3341
3342 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
3343                                           yaffs_ExtendedTags *tags)
3344 {
3345         /* Get the Tnode, then get the level 0 offset chunk offset */
3346         yaffs_Tnode *tn;
3347         int theChunk = -1;
3348         yaffs_ExtendedTags localTags;
3349
3350         yaffs_Device *dev = in->myDev;
3351         int retVal = -1;
3352
3353         if (!tags) {
3354                 /* Passed a NULL, so use our own tags space */
3355                 tags = &localTags;
3356         }
3357
3358         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3359
3360         if (tn) {
3361
3362                 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3363
3364                 retVal =
3365                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3366                                            chunkInInode);
3367
3368                 /* Delete the entry in the filestructure (if found) */
3369                 if (retVal != -1)
3370                         yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0);
3371         }
3372
3373         return retVal;
3374 }
3375
3376 #ifdef YAFFS_PARANOID
3377
3378 static int yaffs_CheckFileSanity(yaffs_Object *in)
3379 {
3380         int chunk;
3381         int nChunks;
3382         int fSize;
3383         int failed = 0;
3384         int objId;
3385         yaffs_Tnode *tn;
3386         yaffs_Tags localTags;
3387         yaffs_Tags *tags = &localTags;
3388         int theChunk;
3389         int chunkDeleted;
3390
3391         if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
3392                 return YAFFS_FAIL;
3393
3394         objId = in->objectId;
3395         fSize = in->variant.fileVariant.fileSize;
3396         nChunks =
3397             (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3398
3399         for (chunk = 1; chunk <= nChunks; chunk++) {
3400                 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3401                                            chunk);
3402
3403                 if (tn) {
3404
3405                         theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
3406
3407                         if (yaffs_CheckChunkBits
3408                             (dev, theChunk / dev->nChunksPerBlock,
3409                              theChunk % dev->nChunksPerBlock)) {
3410
3411                                 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3412                                                             tags,
3413                                                             &chunkDeleted);
3414                                 if (yaffs_TagsMatch
3415                                     (tags, in->objectId, chunk, chunkDeleted)) {
3416                                         /* found it; */
3417
3418                                 }
3419                         } else {
3420
3421                                 failed = 1;
3422                         }
3423
3424                 } else {
3425                         /* T(("No level 0 found for %d\n", chunk)); */
3426                 }
3427         }
3428
3429         return failed ? YAFFS_FAIL : YAFFS_OK;
3430 }
3431
3432 #endif
3433
3434 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
3435                                   int chunkInNAND, int inScan)
3436 {
3437         /* NB inScan is zero unless scanning.
3438          * For forward scanning, inScan is > 0;
3439          * for backward scanning inScan is < 0
3440          *
3441          * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there.
3442          */
3443
3444         yaffs_Tnode *tn;
3445         yaffs_Device *dev = in->myDev;
3446         int existingChunk;
3447         yaffs_ExtendedTags existingTags;
3448         yaffs_ExtendedTags newTags;
3449         unsigned existingSerial, newSerial;
3450
3451         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3452                 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3453                  * If it is not during Scanning then something went wrong!
3454                  */
3455                 if (!inScan) {
3456                         T(YAFFS_TRACE_ERROR,
3457                           (TSTR
3458                            ("yaffs tragedy:attempt to put data chunk into a non-file"
3459                             TENDSTR)));
3460                         YBUG();
3461                 }
3462
3463                 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3464                 return YAFFS_OK;
3465         }
3466
3467         tn = yaffs_AddOrFindLevel0Tnode(dev,
3468                                         &in->variant.fileVariant,
3469                                         chunkInInode,
3470                                         NULL);
3471         if (!tn)
3472                 return YAFFS_FAIL;
3473
3474         if(!chunkInNAND)
3475                 /* Dummy insert, bail now */
3476                 return YAFFS_OK;
3477
3478
3479         existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3480
3481         if (inScan != 0) {
3482                 /* If we're scanning then we need to test for duplicates
3483                  * NB This does not need to be efficient since it should only ever
3484                  * happen when the power fails during a write, then only one
3485                  * chunk should ever be affected.
3486                  *
3487                  * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3488                  * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3489                  */
3490
3491                 if (existingChunk > 0) {
3492                         /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3493                          *    thus we have to do a FindChunkInFile to get the real chunk id.
3494                          *
3495                          * We have a duplicate now we need to decide which one to use:
3496                          *
3497                          * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3498                          * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3499                          * YAFFS1: Get both sets of tags and compare serial numbers.
3500                          */
3501
3502                         if (inScan > 0) {
3503                                 /* Only do this for forward scanning */
3504                                 yaffs_ReadChunkWithTagsFromNAND(dev,
3505                                                                 chunkInNAND,
3506                                                                 NULL, &newTags);
3507
3508                                 /* Do a proper find */
3509                                 existingChunk =
3510                                     yaffs_FindChunkInFile(in, chunkInInode,
3511                                                           &existingTags);
3512                         }
3513
3514                         if (existingChunk <= 0) {
3515                                 /*Hoosterman - how did this happen? */
3516
3517                                 T(YAFFS_TRACE_ERROR,
3518                                   (TSTR
3519                                    ("yaffs tragedy: existing chunk < 0 in scan"
3520                                     TENDSTR)));
3521
3522                         }
3523
3524                         /* NB The deleted flags should be false, otherwise the chunks will
3525                          * not be loaded during a scan
3526                          */
3527
3528                         if (inScan > 0) {
3529                                 newSerial = newTags.serialNumber;
3530                                 existingSerial = existingTags.serialNumber;
3531                         }
3532
3533                         if ((inScan > 0) &&
3534                             (in->myDev->isYaffs2 ||
3535                              existingChunk <= 0 ||
3536                              ((existingSerial + 1) & 3) == newSerial)) {
3537                                 /* Forward scanning.
3538                                  * Use new
3539                                  * Delete the old one and drop through to update the tnode
3540                                  */
3541                                 yaffs_DeleteChunk(dev, existingChunk, 1,
3542                                                   __LINE__);
3543                         } else {
3544                                 /* Backward scanning or we want to use the existing one
3545                                  * Use existing.
3546                                  * Delete the new one and return early so that the tnode isn't changed
3547                                  */
3548                                 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3549                                                   __LINE__);
3550                                 return YAFFS_OK;
3551                         }
3552                 }
3553
3554         }
3555
3556         if (existingChunk == 0)
3557                 in->nDataChunks++;
3558
3559         yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
3560
3561         return YAFFS_OK;
3562 }
3563
3564 static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
3565                                         __u8 *buffer)
3566 {
3567         int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3568
3569         if (chunkInNAND >= 0)
3570                 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3571                                                 buffer, NULL);
3572         else {
3573                 T(YAFFS_TRACE_NANDACCESS,
3574                   (TSTR("Chunk %d not found zero instead" TENDSTR),
3575                    chunkInNAND));
3576                 /* get sane (zero) data if you read a hole */
3577                 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3578                 return 0;
3579         }
3580
3581 }
3582
3583 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
3584 {
3585         int block;
3586         int page;
3587         yaffs_ExtendedTags tags;
3588         yaffs_BlockInfo *bi;
3589
3590         if (chunkId <= 0)
3591                 return;
3592
3593         dev->nDeletions++;
3594         block = chunkId / dev->nChunksPerBlock;
3595         page = chunkId % dev->nChunksPerBlock;
3596
3597
3598         if (!yaffs_CheckChunkBit(dev, block, page))
3599                 T(YAFFS_TRACE_VERIFY,
3600                         (TSTR("Deleting invalid chunk %d"TENDSTR),
3601                          chunkId));
3602
3603         bi = yaffs_GetBlockInfo(dev, block);
3604
3605         T(YAFFS_TRACE_DELETION,
3606           (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3607
3608         if (markNAND &&
3609             bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
3610
3611                 yaffs_InitialiseTags(&tags);
3612
3613                 tags.chunkDeleted = 1;
3614
3615                 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3616                 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3617         } else {
3618                 dev->nUnmarkedDeletions++;
3619         }
3620
3621         /* Pull out of the management area.
3622          * If the whole block became dirty, this will kick off an erasure.
3623          */
3624         if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3625             bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3626             bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3627             bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3628                 dev->nFreeChunks++;
3629
3630                 yaffs_ClearChunkBit(dev, block, page);
3631
3632                 bi->pagesInUse--;
3633
3634                 if (bi->pagesInUse == 0 &&
3635                     !bi->hasShrinkHeader &&
3636                     bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3637                     bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3638                         yaffs_BlockBecameDirty(dev, block);
3639                 }
3640
3641         }
3642
3643 }
3644
3645 static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
3646                                         const __u8 *buffer, int nBytes,
3647                                         int useReserve)
3648 {
3649         /* Find old chunk Need to do this to get serial number
3650          * Write new one and patch into tree.
3651          * Invalidate old tags.
3652          */
3653
3654         int prevChunkId;
3655         yaffs_ExtendedTags prevTags;
3656
3657         int newChunkId;
3658         yaffs_ExtendedTags newTags;
3659
3660         yaffs_Device *dev = in->myDev;
3661
3662         yaffs_CheckGarbageCollection(dev);
3663
3664         /* Get the previous chunk at this location in the file if it exists */
3665         prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3666
3667         /* Set up new tags */
3668         yaffs_InitialiseTags(&newTags);
3669
3670         newTags.chunkId = chunkInInode;
3671         newTags.objectId = in->objectId;
3672         newTags.serialNumber =
3673             (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
3674         newTags.byteCount = nBytes;
3675
3676         if (nBytes < 1 || nBytes > dev->totalBytesPerChunk) {
3677                 T(YAFFS_TRACE_ERROR,
3678                 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
3679                 YBUG();
3680         }
3681
3682         /*
3683          * If there isn't already a chunk there then do a dummy
3684          * insert to make sue we have the desired tnode structure.
3685          */
3686         if(prevChunkId < 1 &&
3687                 yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0) != YAFFS_OK)
3688                 return -1;
3689
3690         newChunkId =
3691             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3692                                               useReserve);
3693
3694         if (newChunkId > 0) {
3695                 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3696
3697                 if (prevChunkId > 0)
3698                         yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3699
3700                 yaffs_CheckFileSanity(in);
3701         }
3702         return newChunkId;
3703
3704 }
3705
3706 /* UpdateObjectHeader updates the header on NAND for an object.
3707  * If name is not NULL, then that new name is used.
3708  */
3709 int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
3710                              int isShrink, int shadows)
3711 {
3712
3713         yaffs_BlockInfo *bi;
3714
3715         yaffs_Device *dev = in->myDev;
3716
3717         int prevChunkId;
3718         int retVal = 0;
3719         int result = 0;
3720
3721         int newChunkId;
3722         yaffs_ExtendedTags newTags;
3723         yaffs_ExtendedTags oldTags;
3724         YCHAR *alias = NULL;
3725
3726         __u8 *buffer = NULL;
3727         YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3728
3729         yaffs_ObjectHeader *oh = NULL;
3730
3731         yaffs_strcpy(oldName, _Y("silly old name"));
3732
3733
3734         if (!in->fake ||
3735                 in == dev->rootDir || /* The rootDir should also be saved */
3736                 force) {
3737
3738                 yaffs_CheckGarbageCollection(dev);
3739                 yaffs_CheckObjectDetailsLoaded(in);
3740
3741                 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3742                 oh = (yaffs_ObjectHeader *) buffer;
3743
3744                 prevChunkId = in->hdrChunk;
3745
3746                 if (prevChunkId > 0) {
3747                         result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3748                                                         buffer, &oldTags);
3749
3750                         yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
3751
3752                         memcpy(oldName, oh->name, sizeof(oh->name));
3753                 }
3754
3755                 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3756
3757                 oh->type = in->variantType;
3758                 oh->yst_mode = in->yst_mode;
3759                 oh->shadowsObject = oh->inbandShadowsObject = shadows;
3760
3761 #ifdef CONFIG_YAFFS_WINCE
3762                 oh->win_atime[0] = in->win_atime[0];
3763                 oh->win_ctime[0] = in->win_ctime[0];
3764                 oh->win_mtime[0] = in->win_mtime[0];
3765                 oh->win_atime[1] = in->win_atime[1];
3766                 oh->win_ctime[1] = in->win_ctime[1];
3767                 oh->win_mtime[1] = in->win_mtime[1];
3768 #else
3769                 oh->yst_uid = in->yst_uid;
3770                 oh->yst_gid = in->yst_gid;
3771                 oh->yst_atime = in->yst_atime;
3772                 oh->yst_mtime = in->yst_mtime;
3773                 oh->yst_ctime = in->yst_ctime;
3774                 oh->yst_rdev = in->yst_rdev;
3775 #endif
3776                 if (in->parent)
3777                         oh->parentObjectId = in->parent->objectId;
3778                 else
3779                         oh->parentObjectId = 0;
3780
3781                 if (name && *name) {
3782                         memset(oh->name, 0, sizeof(oh->name));
3783                         yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3784                 } else if (prevChunkId > 0)
3785                         memcpy(oh->name, oldName, sizeof(oh->name));
3786                 else
3787                         memset(oh->name, 0, sizeof(oh->name));
3788
3789                 oh->isShrink = isShrink;
3790
3791                 switch (in->variantType) {
3792                 case YAFFS_OBJECT_TYPE_UNKNOWN:
3793                         /* Should not happen */
3794                         break;
3795                 case YAFFS_OBJECT_TYPE_FILE:
3796                         oh->fileSize =
3797                             (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3798                              || oh->parentObjectId ==
3799                              YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3800                             fileVariant.fileSize;
3801                         break;
3802                 case YAFFS_OBJECT_TYPE_HARDLINK:
3803                         oh->equivalentObjectId =
3804                             in->variant.hardLinkVariant.equivalentObjectId;
3805                         break;
3806                 case YAFFS_OBJECT_TYPE_SPECIAL:
3807                         /* Do nothing */
3808                         break;
3809                 case YAFFS_OBJECT_TYPE_DIRECTORY:
3810                         /* Do nothing */
3811                         break;
3812                 case YAFFS_OBJECT_TYPE_SYMLINK:
3813                         alias = in->variant.symLinkVariant.alias;
3814                         if(!alias)
3815                                 alias = _Y("no alias");
3816                         yaffs_strncpy(oh->alias,
3817                                         alias,
3818                                       YAFFS_MAX_ALIAS_LENGTH);
3819                         oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3820                         break;
3821                 }
3822
3823                 /* Tags */
3824                 yaffs_InitialiseTags(&newTags);
3825                 in->serial++;
3826                 newTags.chunkId = 0;
3827                 newTags.objectId = in->objectId;
3828                 newTags.serialNumber = in->serial;
3829
3830                 /* Add extra info for file header */
3831
3832                 newTags.extraHeaderInfoAvailable = 1;
3833                 newTags.extraParentObjectId = oh->parentObjectId;
3834                 newTags.extraFileLength = oh->fileSize;
3835                 newTags.extraIsShrinkHeader = oh->isShrink;
3836                 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3837                 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3838                 newTags.extraObjectType = in->variantType;
3839
3840                 yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
3841
3842                 /* Create new chunk in NAND */
3843                 newChunkId =
3844                     yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3845                                                       (prevChunkId > 0) ? 1 : 0);
3846
3847                 if (newChunkId >= 0) {
3848
3849                         in->hdrChunk = newChunkId;
3850
3851                         if (prevChunkId > 0) {
3852                                 yaffs_DeleteChunk(dev, prevChunkId, 1,
3853                                                   __LINE__);
3854                         }
3855
3856                         if (!yaffs_ObjectHasCachedWriteData(in))
3857                                 in->dirty = 0;
3858
3859                         /* If this was a shrink, then mark the block that the chunk lives on */
3860                         if (isShrink) {
3861                                 bi = yaffs_GetBlockInfo(in->myDev,
3862                                         newChunkId / in->myDev->nChunksPerBlock);
3863                                 bi->hasShrinkHeader = 1;
3864                         }
3865
3866                 }
3867
3868                 retVal = newChunkId;
3869
3870         }
3871
3872         if (buffer)
3873                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3874
3875         return retVal;
3876 }
3877
3878 /*------------------------ Short Operations Cache ----------------------------------------
3879  *   In many situations where there is no high level buffering (eg WinCE) a lot of
3880  *   reads might be short sequential reads, and a lot of writes may be short
3881  *   sequential writes. eg. scanning/writing a jpeg file.
3882  *   In these cases, a short read/write cache can provide a huge perfomance benefit
3883  *   with dumb-as-a-rock code.
3884  *   In Linux, the page cache provides read buffering aand the short op cache provides write
3885  *   buffering.
3886  *
3887  *   There are a limited number (~10) of cache chunks per device so that we don't
3888  *   need a very intelligent search.
3889  */
3890
3891 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3892 {
3893         yaffs_Device *dev = obj->myDev;
3894         int i;
3895         yaffs_ChunkCache *cache;
3896         int nCaches = obj->myDev->nShortOpCaches;
3897
3898         for (i = 0; i < nCaches; i++) {
3899                 cache = &dev->srCache[i];
3900                 if (cache->object == obj &&
3901                     cache->dirty)
3902                         return 1;
3903         }
3904
3905         return 0;
3906 }
3907
3908
3909 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
3910 {
3911         yaffs_Device *dev = obj->myDev;
3912         int lowest = -99;       /* Stop compiler whining. */
3913         int i;
3914         yaffs_ChunkCache *cache;
3915         int chunkWritten = 0;
3916         int nCaches = obj->myDev->nShortOpCaches;
3917
3918         if (nCaches > 0) {
3919                 do {
3920                         cache = NULL;
3921
3922                         /* Find the dirty cache for this object with the lowest chunk id. */
3923                         for (i = 0; i < nCaches; i++) {
3924                                 if (dev->srCache[i].object == obj &&
3925                                     dev->srCache[i].dirty) {
3926                                         if (!cache
3927                                             || dev->srCache[i].chunkId <
3928                                             lowest) {
3929                                                 cache = &dev->srCache[i];
3930                                                 lowest = cache->chunkId;
3931                                         }
3932                                 }
3933                         }
3934
3935                         if (cache && !cache->locked) {
3936                                 /* Write it out and free it up */
3937
3938                                 chunkWritten =
3939                                     yaffs_WriteChunkDataToObject(cache->object,
3940                                                                  cache->chunkId,
3941                                                                  cache->data,
3942                                                                  cache->nBytes,
3943                                                                  1);
3944                                 cache->dirty = 0;
3945                                 cache->object = NULL;
3946                         }
3947
3948                 } while (cache && chunkWritten > 0);
3949
3950                 if (cache) {
3951                         /* Hoosterman, disk full while writing cache out. */
3952                         T(YAFFS_TRACE_ERROR,
3953                           (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3954
3955                 }
3956         }
3957
3958 }
3959
3960 /*yaffs_FlushEntireDeviceCache(dev)
3961  *
3962  *
3963  */
3964
3965 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
3966 {
3967         yaffs_Object *obj;
3968         int nCaches = dev->nShortOpCaches;
3969         int i;
3970
3971         /* Find a dirty object in the cache and flush it...
3972          * until there are no further dirty objects.
3973          */
3974         do {
3975                 obj = NULL;
3976                 for (i = 0; i < nCaches && !obj; i++) {
3977                         if (dev->srCache[i].object &&
3978                             dev->srCache[i].dirty)
3979                                 obj = dev->srCache[i].object;
3980
3981                 }
3982                 if (obj)
3983                         yaffs_FlushFilesChunkCache(obj);
3984
3985         } while (obj);
3986
3987 }
3988
3989
3990 /* Grab us a cache chunk for use.
3991  * First look for an empty one.
3992  * Then look for the least recently used non-dirty one.
3993  * Then look for the least recently used dirty one...., flush and look again.
3994  */
3995 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
3996 {
3997         int i;
3998
3999         if (dev->nShortOpCaches > 0) {
4000                 for (i = 0; i < dev->nShortOpCaches; i++) {
4001                         if (!dev->srCache[i].object)
4002                                 return &dev->srCache[i];
4003                 }
4004         }
4005
4006         return NULL;
4007 }
4008
4009 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
4010 {
4011         yaffs_ChunkCache *cache;
4012         yaffs_Object *theObj;
4013         int usage;
4014         int i;
4015         int pushout;
4016
4017         if (dev->nShortOpCaches > 0) {
4018                 /* Try find a non-dirty one... */
4019
4020                 cache = yaffs_GrabChunkCacheWorker(dev);
4021
4022                 if (!cache) {
4023                         /* They were all dirty, find the last recently used object and flush
4024                          * its cache, then  find again.
4025                          * NB what's here is not very accurate, we actually flush the object
4026                          * the last recently used page.
4027                          */
4028
4029                         /* With locking we can't assume we can use entry zero */
4030
4031                         theObj = NULL;
4032                         usage = -1;
4033                         cache = NULL;
4034                         pushout = -1;
4035
4036                         for (i = 0; i < dev->nShortOpCaches; i++) {
4037                                 if (dev->srCache[i].object &&
4038                                     !dev->srCache[i].locked &&
4039                                     (dev->srCache[i].lastUse < usage || !cache)) {
4040                                         usage = dev->srCache[i].lastUse;
4041                                         theObj = dev->srCache[i].object;
4042                                         cache = &dev->srCache[i];
4043                                         pushout = i;
4044                                 }
4045                         }
4046
4047                         if (!cache || cache->dirty) {
4048                                 /* Flush and try again */
4049                                 yaffs_FlushFilesChunkCache(theObj);
4050                                 cache = yaffs_GrabChunkCacheWorker(dev);
4051                         }
4052
4053                 }
4054                 return cache;
4055         } else
4056                 return NULL;
4057
4058 }
4059
4060 /* Find a cached chunk */
4061 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
4062                                               int chunkId)
4063 {
4064         yaffs_Device *dev = obj->myDev;
4065         int i;
4066         if (dev->nShortOpCaches > 0) {
4067                 for (i = 0; i < dev->nShortOpCaches; i++) {
4068                         if (dev->srCache[i].object == obj &&
4069                             dev->srCache[i].chunkId == chunkId) {
4070                                 dev->cacheHits++;
4071
4072                                 return &dev->srCache[i];
4073                         }
4074                 }
4075         }
4076         return NULL;
4077 }
4078
4079 /* Mark the chunk for the least recently used algorithym */
4080 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
4081                                 int isAWrite)
4082 {
4083
4084         if (dev->nShortOpCaches > 0) {
4085                 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
4086                         /* Reset the cache usages */
4087                         int i;
4088                         for (i = 1; i < dev->nShortOpCaches; i++)
4089                                 dev->srCache[i].lastUse = 0;
4090
4091                         dev->srLastUse = 0;
4092                 }
4093
4094                 dev->srLastUse++;
4095
4096                 cache->lastUse = dev->srLastUse;
4097
4098                 if (isAWrite)
4099                         cache->dirty = 1;
4100         }
4101 }
4102
4103 /* Invalidate a single cache page.
4104  * Do this when a whole page gets written,
4105  * ie the short cache for this page is no longer valid.
4106  */
4107 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
4108 {
4109         if (object->myDev->nShortOpCaches > 0) {
4110                 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4111
4112                 if (cache)
4113                         cache->object = NULL;
4114         }
4115 }
4116
4117 /* Invalidate all the cache pages associated with this object
4118  * Do this whenever ther file is deleted or resized.
4119  */
4120 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
4121 {
4122         int i;
4123         yaffs_Device *dev = in->myDev;
4124
4125         if (dev->nShortOpCaches > 0) {
4126                 /* Invalidate it. */
4127                 for (i = 0; i < dev->nShortOpCaches; i++) {
4128                         if (dev->srCache[i].object == in)
4129                                 dev->srCache[i].object = NULL;
4130                 }
4131         }
4132 }
4133
4134 /*--------------------- Checkpointing --------------------*/
4135
4136
4137 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
4138 {
4139         yaffs_CheckpointValidity cp;
4140
4141         memset(&cp, 0, sizeof(cp));
4142
4143         cp.structType = sizeof(cp);
4144         cp.magic = YAFFS_MAGIC;
4145         cp.version = YAFFS_CHECKPOINT_VERSION;
4146         cp.head = (head) ? 1 : 0;
4147
4148         return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
4149                 1 : 0;
4150 }
4151
4152 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4153 {
4154         yaffs_CheckpointValidity cp;
4155         int ok;
4156
4157         ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4158
4159         if (ok)
4160                 ok = (cp.structType == sizeof(cp)) &&
4161                      (cp.magic == YAFFS_MAGIC) &&
4162                      (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4163                      (cp.head == ((head) ? 1 : 0));
4164         return ok ? 1 : 0;
4165 }
4166
4167 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4168                                            yaffs_Device *dev)
4169 {
4170         cp->nErasedBlocks = dev->nErasedBlocks;
4171         cp->allocationBlock = dev->allocationBlock;
4172         cp->allocationPage = dev->allocationPage;
4173         cp->nFreeChunks = dev->nFreeChunks;
4174
4175         cp->nDeletedFiles = dev->nDeletedFiles;
4176         cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4177         cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4178         cp->sequenceNumber = dev->sequenceNumber;
4179         cp->oldestDirtySequence = dev->oldestDirtySequence;
4180
4181 }
4182
4183 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4184                                            yaffs_CheckpointDevice *cp)
4185 {
4186         dev->nErasedBlocks = cp->nErasedBlocks;
4187         dev->allocationBlock = cp->allocationBlock;
4188         dev->allocationPage = cp->allocationPage;
4189         dev->nFreeChunks = cp->nFreeChunks;
4190
4191         dev->nDeletedFiles = cp->nDeletedFiles;
4192         dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4193         dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4194         dev->sequenceNumber = cp->sequenceNumber;
4195         dev->oldestDirtySequence = cp->oldestDirtySequence;
4196 }
4197
4198
4199 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4200 {
4201         yaffs_CheckpointDevice cp;
4202         __u32 nBytes;
4203         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4204
4205         int ok;
4206
4207         /* Write device runtime values*/
4208         yaffs_DeviceToCheckpointDevice(&cp, dev);
4209         cp.structType = sizeof(cp);
4210
4211         ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4212
4213         /* Write block info */
4214         if (ok) {
4215                 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4216                 ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
4217         }
4218
4219         /* Write chunk bits */
4220         if (ok) {
4221                 nBytes = nBlocks * dev->chunkBitmapStride;
4222                 ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
4223         }
4224         return   ok ? 1 : 0;
4225
4226 }
4227
4228 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4229 {
4230         yaffs_CheckpointDevice cp;
4231         __u32 nBytes;
4232         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4233
4234         int ok;
4235
4236         ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4237         if (!ok)
4238                 return 0;
4239
4240         if (cp.structType != sizeof(cp))
4241                 return 0;
4242
4243
4244         yaffs_CheckpointDeviceToDevice(dev, &cp);
4245
4246         nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4247
4248         ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
4249
4250         if (!ok)
4251                 return 0;
4252         nBytes = nBlocks * dev->chunkBitmapStride;
4253
4254         ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
4255
4256         return ok ? 1 : 0;
4257 }
4258
4259 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4260                                            yaffs_Object *obj)
4261 {
4262
4263         cp->objectId = obj->objectId;
4264         cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4265         cp->hdrChunk = obj->hdrChunk;
4266         cp->variantType = obj->variantType;
4267         cp->deleted = obj->deleted;
4268         cp->softDeleted = obj->softDeleted;
4269         cp->unlinked = obj->unlinked;
4270         cp->fake = obj->fake;
4271         cp->renameAllowed = obj->renameAllowed;
4272         cp->unlinkAllowed = obj->unlinkAllowed;
4273         cp->serial = obj->serial;
4274         cp->nDataChunks = obj->nDataChunks;
4275
4276         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4277                 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4278         else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4279                 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4280 }
4281
4282 static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
4283 {
4284
4285         yaffs_Object *parent;
4286
4287         if (obj->variantType != cp->variantType) {
4288                 T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
4289                         TCONT("chunk %d does not match existing object type %d")
4290                         TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
4291                         obj->variantType));
4292                 return 0;
4293         }
4294
4295         obj->objectId = cp->objectId;
4296
4297         if (cp->parentId)
4298                 parent = yaffs_FindOrCreateObjectByNumber(
4299                                         obj->myDev,
4300                                         cp->parentId,
4301                                         YAFFS_OBJECT_TYPE_DIRECTORY);
4302         else
4303                 parent = NULL;
4304
4305         if (parent) {
4306                 if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4307                         T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
4308                                 TCONT(" chunk %d Parent type, %d, not directory")
4309                                 TENDSTR),
4310                                 cp->objectId, cp->parentId, cp->variantType,
4311                                 cp->hdrChunk, parent->variantType));
4312                         return 0;
4313                 }
4314                 yaffs_AddObjectToDirectory(parent, obj);
4315         }
4316
4317         obj->hdrChunk = cp->hdrChunk;
4318         obj->variantType = cp->variantType;
4319         obj->deleted = cp->deleted;
4320         obj->softDeleted = cp->softDeleted;
4321         obj->unlinked = cp->unlinked;
4322         obj->fake = cp->fake;
4323         obj->renameAllowed = cp->renameAllowed;
4324         obj->unlinkAllowed = cp->unlinkAllowed;
4325         obj->serial = cp->serial;
4326         obj->nDataChunks = cp->nDataChunks;
4327
4328         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4329                 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4330         else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4331                 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4332
4333         if (obj->hdrChunk > 0)
4334                 obj->lazyLoaded = 1;
4335         return 1;
4336 }
4337
4338
4339
4340 static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
4341                                         __u32 level, int chunkOffset)
4342 {
4343         int i;
4344         yaffs_Device *dev = in->myDev;
4345         int ok = 1;
4346         int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4347
4348         if (tnodeSize < sizeof(yaffs_Tnode))
4349                 tnodeSize = sizeof(yaffs_Tnode);
4350
4351
4352         if (tn) {
4353                 if (level > 0) {
4354
4355                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
4356                                 if (tn->internal[i]) {
4357                                         ok = yaffs_CheckpointTnodeWorker(in,
4358                                                         tn->internal[i],
4359                                                         level - 1,
4360                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4361                                 }
4362                         }
4363                 } else if (level == 0) {
4364                         __u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
4365                         ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
4366                         if (ok)
4367                                 ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
4368                 }
4369         }
4370
4371         return ok;
4372
4373 }
4374
4375 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4376 {
4377         __u32 endMarker = ~0;
4378         int ok = 1;
4379
4380         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4381                 ok = yaffs_CheckpointTnodeWorker(obj,
4382                                             obj->variant.fileVariant.top,
4383                                             obj->variant.fileVariant.topLevel,
4384                                             0);
4385                 if (ok)
4386                         ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
4387                                 sizeof(endMarker));
4388         }
4389
4390         return ok ? 1 : 0;
4391 }
4392
4393 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4394 {
4395         __u32 baseChunk;
4396         int ok = 1;
4397         yaffs_Device *dev = obj->myDev;
4398         yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4399         yaffs_Tnode *tn;
4400         int nread = 0;
4401         int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4402
4403         if (tnodeSize < sizeof(yaffs_Tnode))
4404                 tnodeSize = sizeof(yaffs_Tnode);
4405
4406         ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4407
4408         while (ok && (~baseChunk)) {
4409                 nread++;
4410                 /* Read level 0 tnode */
4411
4412
4413                 tn = yaffs_GetTnodeRaw(dev);
4414                 if (tn)
4415                         ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
4416                 else
4417                         ok = 0;
4418
4419                 if (tn && ok)
4420                         ok = yaffs_AddOrFindLevel0Tnode(dev,
4421                                                         fileStructPtr,
4422                                                         baseChunk,
4423                                                         tn) ? 1 : 0;
4424
4425                 if (ok)
4426                         ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4427
4428         }
4429
4430         T(YAFFS_TRACE_CHECKPOINT, (
4431                 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4432                 nread, baseChunk, ok));
4433
4434         return ok ? 1 : 0;
4435 }
4436
4437
4438 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4439 {
4440         yaffs_Object *obj;
4441         yaffs_CheckpointObject cp;
4442         int i;
4443         int ok = 1;
4444         struct ylist_head *lh;
4445
4446
4447         /* Iterate through the objects in each hash entry,
4448          * dumping them to the checkpointing stream.
4449          */
4450
4451         for (i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++) {
4452                 ylist_for_each(lh, &dev->objectBucket[i].list) {
4453                         if (lh) {
4454                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
4455                                 if (!obj->deferedFree) {
4456                                         yaffs_ObjectToCheckpointObject(&cp, obj);
4457                                         cp.structType = sizeof(cp);
4458
4459                                         T(YAFFS_TRACE_CHECKPOINT, (
4460                                                 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
4461                                                 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, (unsigned) obj));
4462
4463                                         ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4464
4465                                         if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4466                                                 ok = yaffs_WriteCheckpointTnodes(obj);
4467                                 }
4468                         }
4469                 }
4470         }
4471
4472         /* Dump end of list */
4473         memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
4474         cp.structType = sizeof(cp);
4475
4476         if (ok)
4477                 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4478
4479         return ok ? 1 : 0;
4480 }
4481
4482 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4483 {
4484         yaffs_Object *obj;
4485         yaffs_CheckpointObject cp;
4486         int ok = 1;
4487         int done = 0;
4488         yaffs_Object *hardList = NULL;
4489
4490         while (ok && !done) {
4491                 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4492                 if (cp.structType != sizeof(cp)) {
4493                         T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
4494                                 cp.structType, sizeof(cp), ok));
4495                         ok = 0;
4496                 }
4497
4498                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4499                         cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
4500
4501                 if (ok && cp.objectId == ~0)
4502                         done = 1;
4503                 else if (ok) {
4504                         obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
4505                         if (obj) {
4506                                 ok = yaffs_CheckpointObjectToObject(obj, &cp);
4507                                 if (!ok)
4508                                         break;
4509                                 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4510                                         ok = yaffs_ReadCheckpointTnodes(obj);
4511                                 } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4512                                         obj->hardLinks.next =
4513                                                 (struct ylist_head *) hardList;
4514                                         hardList = obj;
4515                                 }
4516                         } else
4517                                 ok = 0;
4518                 }
4519         }
4520
4521         if (ok)
4522                 yaffs_HardlinkFixup(dev, hardList);
4523
4524         return ok ? 1 : 0;
4525 }
4526
4527 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4528 {
4529         __u32 checkpointSum;
4530         int ok;
4531
4532         yaffs_GetCheckpointSum(dev, &checkpointSum);
4533
4534         ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
4535
4536         if (!ok)
4537                 return 0;
4538
4539         return 1;
4540 }
4541
4542 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4543 {
4544         __u32 checkpointSum0;
4545         __u32 checkpointSum1;
4546         int ok;
4547
4548         yaffs_GetCheckpointSum(dev, &checkpointSum0);
4549
4550         ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4551
4552         if (!ok)
4553                 return 0;
4554
4555         if (checkpointSum0 != checkpointSum1)
4556                 return 0;
4557
4558         return 1;
4559 }
4560
4561
4562 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4563 {
4564         int ok = 1;
4565
4566         if (dev->skipCheckpointWrite || !dev->isYaffs2) {
4567                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
4568                 ok = 0;
4569         }
4570
4571         if (ok)
4572                 ok = yaffs_CheckpointOpen(dev, 1);
4573
4574         if (ok) {
4575                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4576                 ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
4577         }
4578         if (ok) {
4579                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
4580                 ok = yaffs_WriteCheckpointDevice(dev);
4581         }
4582         if (ok) {
4583                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
4584                 ok = yaffs_WriteCheckpointObjects(dev);
4585         }
4586         if (ok) {
4587                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4588                 ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
4589         }
4590
4591         if (ok)
4592                 ok = yaffs_WriteCheckpointSum(dev);
4593
4594         if (!yaffs_CheckpointClose(dev))
4595                 ok = 0;
4596
4597         if (ok)
4598                 dev->isCheckpointed = 1;
4599         else
4600                 dev->isCheckpointed = 0;
4601
4602         return dev->isCheckpointed;
4603 }
4604
4605 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4606 {
4607         int ok = 1;
4608
4609         if (dev->skipCheckpointRead || !dev->isYaffs2) {
4610                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
4611                 ok = 0;
4612         }
4613
4614         if (ok)
4615                 ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
4616
4617         if (ok) {
4618                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4619                 ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
4620         }
4621         if (ok) {
4622                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
4623                 ok = yaffs_ReadCheckpointDevice(dev);
4624         }
4625         if (ok) {
4626                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
4627                 ok = yaffs_ReadCheckpointObjects(dev);
4628         }
4629         if (ok) {
4630                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4631                 ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
4632         }
4633
4634         if (ok) {
4635                 ok = yaffs_ReadCheckpointSum(dev);
4636                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
4637         }
4638
4639         if (!yaffs_CheckpointClose(dev))
4640                 ok = 0;
4641
4642         if (ok)
4643                 dev->isCheckpointed = 1;
4644         else
4645                 dev->isCheckpointed = 0;
4646
4647         return ok ? 1 : 0;
4648
4649 }
4650
4651 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4652 {
4653         if (dev->isCheckpointed ||
4654                         dev->blocksInCheckpoint > 0) {
4655                 dev->isCheckpointed = 0;
4656                 yaffs_CheckpointInvalidateStream(dev);
4657                 if (dev->superBlock && dev->markSuperBlockDirty)
4658                         dev->markSuperBlockDirty(dev->superBlock);
4659         }
4660 }
4661
4662
4663 int yaffs_CheckpointSave(yaffs_Device *dev)
4664 {
4665
4666         T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4667
4668         yaffs_VerifyObjects(dev);
4669         yaffs_VerifyBlocks(dev);
4670         yaffs_VerifyFreeChunks(dev);
4671
4672         if (!dev->isCheckpointed) {
4673                 yaffs_InvalidateCheckpoint(dev);
4674                 yaffs_WriteCheckpointData(dev);
4675         }
4676
4677         T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4678
4679         return dev->isCheckpointed;
4680 }
4681
4682 int yaffs_CheckpointRestore(yaffs_Device *dev)
4683 {
4684         int retval;
4685         T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4686
4687         retval = yaffs_ReadCheckpointData(dev);
4688
4689         if (dev->isCheckpointed) {
4690                 yaffs_VerifyObjects(dev);
4691                 yaffs_VerifyBlocks(dev);
4692                 yaffs_VerifyFreeChunks(dev);
4693         }
4694
4695         T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4696
4697         return retval;
4698 }
4699
4700 /*--------------------- File read/write ------------------------
4701  * Read and write have very similar structures.
4702  * In general the read/write has three parts to it
4703  * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4704  * Some complete chunks
4705  * An incomplete chunk to end off with
4706  *
4707  * Curve-balls: the first chunk might also be the last chunk.
4708  */
4709
4710 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
4711                         int nBytes)
4712 {
4713
4714         int chunk;
4715         __u32 start;
4716         int nToCopy;
4717         int n = nBytes;
4718         int nDone = 0;
4719         yaffs_ChunkCache *cache;
4720
4721         yaffs_Device *dev;
4722
4723         dev = in->myDev;
4724
4725         while (n > 0) {
4726                 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4727                 /* start = offset % dev->nDataBytesPerChunk; */
4728                 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4729                 chunk++;
4730
4731                 /* OK now check for the curveball where the start and end are in
4732                  * the same chunk.
4733                  */
4734                 if ((start + n) < dev->nDataBytesPerChunk)
4735                         nToCopy = n;
4736                 else
4737                         nToCopy = dev->nDataBytesPerChunk - start;
4738
4739                 cache = yaffs_FindChunkCache(in, chunk);
4740
4741                 /* If the chunk is already in the cache or it is less than a whole chunk
4742                  * or we're using inband tags then use the cache (if there is caching)
4743                  * else bypass the cache.
4744                  */
4745                 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4746                         if (dev->nShortOpCaches > 0) {
4747
4748                                 /* If we can't find the data in the cache, then load it up. */
4749
4750                                 if (!cache) {
4751                                         cache = yaffs_GrabChunkCache(in->myDev);
4752                                         cache->object = in;
4753                                         cache->chunkId = chunk;
4754                                         cache->dirty = 0;
4755                                         cache->locked = 0;
4756                                         yaffs_ReadChunkDataFromObject(in, chunk,
4757                                                                       cache->
4758                                                                       data);
4759                                         cache->nBytes = 0;
4760                                 }
4761
4762                                 yaffs_UseChunkCache(dev, cache, 0);
4763
4764                                 cache->locked = 1;
4765
4766
4767                                 memcpy(buffer, &cache->data[start], nToCopy);
4768
4769                                 cache->locked = 0;
4770                         } else {
4771                                 /* Read into the local buffer then copy..*/
4772
4773                                 __u8 *localBuffer =
4774                                     yaffs_GetTempBuffer(dev, __LINE__);
4775                                 yaffs_ReadChunkDataFromObject(in, chunk,
4776                                                               localBuffer);
4777
4778                                 memcpy(buffer, &localBuffer[start], nToCopy);
4779
4780
4781                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
4782                                                         __LINE__);
4783                         }
4784
4785                 } else {
4786
4787                         /* A full chunk. Read directly into the supplied buffer. */
4788                         yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4789
4790                 }
4791
4792                 n -= nToCopy;
4793                 offset += nToCopy;
4794                 buffer += nToCopy;
4795                 nDone += nToCopy;
4796
4797         }
4798
4799         return nDone;
4800 }
4801
4802 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
4803                         int nBytes, int writeThrough)
4804 {
4805
4806         int chunk;
4807         __u32 start;
4808         int nToCopy;
4809         int n = nBytes;
4810         int nDone = 0;
4811         int nToWriteBack;
4812         int startOfWrite = offset;
4813         int chunkWritten = 0;
4814         __u32 nBytesRead;
4815         __u32 chunkStart;
4816
4817         yaffs_Device *dev;
4818
4819         dev = in->myDev;
4820
4821         while (n > 0 && chunkWritten >= 0) {
4822                 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4823                 /* start = offset % dev->nDataBytesPerChunk; */
4824                 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4825
4826                 if (chunk * dev->nDataBytesPerChunk + start != offset ||
4827                                 start >= dev->nDataBytesPerChunk) {
4828                         T(YAFFS_TRACE_ERROR, (
4829                            TSTR("AddrToChunk of offset %d gives chunk %d start %d"
4830                            TENDSTR),
4831                            (int)offset, chunk, start));
4832                 }
4833                 chunk++;
4834
4835                 /* OK now check for the curveball where the start and end are in
4836                  * the same chunk.
4837                  */
4838
4839                 if ((start + n) < dev->nDataBytesPerChunk) {
4840                         nToCopy = n;
4841
4842                         /* Now folks, to calculate how many bytes to write back....
4843                          * If we're overwriting and not writing to then end of file then
4844                          * we need to write back as much as was there before.
4845                          */
4846
4847                         chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
4848
4849                         if (chunkStart > in->variant.fileVariant.fileSize)
4850                                 nBytesRead = 0; /* Past end of file */
4851                         else
4852                                 nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
4853
4854                         if (nBytesRead > dev->nDataBytesPerChunk)
4855                                 nBytesRead = dev->nDataBytesPerChunk;
4856
4857                         nToWriteBack =
4858                             (nBytesRead >
4859                              (start + n)) ? nBytesRead : (start + n);
4860
4861                         if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
4862                                 YBUG();
4863
4864                 } else {
4865                         nToCopy = dev->nDataBytesPerChunk - start;
4866                         nToWriteBack = dev->nDataBytesPerChunk;
4867                 }
4868
4869                 if (nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4870                         /* An incomplete start or end chunk (or maybe both start and end chunk),
4871                          * or we're using inband tags, so we want to use the cache buffers.
4872                          */
4873                         if (dev->nShortOpCaches > 0) {
4874                                 yaffs_ChunkCache *cache;
4875                                 /* If we can't find the data in the cache, then load the cache */
4876                                 cache = yaffs_FindChunkCache(in, chunk);
4877
4878                                 if (!cache
4879                                     && yaffs_CheckSpaceForAllocation(in->
4880                                                                      myDev)) {
4881                                         cache = yaffs_GrabChunkCache(in->myDev);
4882                                         cache->object = in;
4883                                         cache->chunkId = chunk;
4884                                         cache->dirty = 0;
4885                                         cache->locked = 0;
4886                                         yaffs_ReadChunkDataFromObject(in, chunk,
4887                                                                       cache->
4888                                                                       data);
4889                                 } else if (cache &&
4890                                         !cache->dirty &&
4891                                         !yaffs_CheckSpaceForAllocation(in->myDev)) {
4892                                         /* Drop the cache if it was a read cache item and
4893                                          * no space check has been made for it.
4894                                          */
4895                                          cache = NULL;
4896                                 }
4897
4898                                 if (cache) {
4899                                         yaffs_UseChunkCache(dev, cache, 1);
4900                                         cache->locked = 1;
4901
4902
4903                                         memcpy(&cache->data[start], buffer,
4904                                                nToCopy);
4905
4906
4907                                         cache->locked = 0;
4908                                         cache->nBytes = nToWriteBack;
4909
4910                                         if (writeThrough) {
4911                                                 chunkWritten =
4912                                                     yaffs_WriteChunkDataToObject
4913                                                     (cache->object,
4914                                                      cache->chunkId,
4915                                                      cache->data, cache->nBytes,
4916                                                      1);
4917                                                 cache->dirty = 0;
4918                                         }
4919
4920                                 } else {
4921                                         chunkWritten = -1;      /* fail the write */
4922                                 }
4923                         } else {
4924                                 /* An incomplete start or end chunk (or maybe both start and end chunk)
4925                                  * Read into the local buffer then copy, then copy over and write back.
4926                                  */
4927
4928                                 __u8 *localBuffer =
4929                                     yaffs_GetTempBuffer(dev, __LINE__);
4930
4931                                 yaffs_ReadChunkDataFromObject(in, chunk,
4932                                                               localBuffer);
4933
4934
4935
4936                                 memcpy(&localBuffer[start], buffer, nToCopy);
4937
4938                                 chunkWritten =
4939                                     yaffs_WriteChunkDataToObject(in, chunk,
4940                                                                  localBuffer,
4941                                                                  nToWriteBack,
4942                                                                  0);
4943
4944                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
4945                                                         __LINE__);
4946
4947                         }
4948
4949                 } else {
4950                         /* A full chunk. Write directly from the supplied buffer. */
4951
4952
4953
4954                         chunkWritten =
4955                             yaffs_WriteChunkDataToObject(in, chunk, buffer,
4956                                                          dev->nDataBytesPerChunk,
4957                                                          0);
4958
4959                         /* Since we've overwritten the cached data, we better invalidate it. */
4960                         yaffs_InvalidateChunkCache(in, chunk);
4961                 }
4962
4963                 if (chunkWritten >= 0) {
4964                         n -= nToCopy;
4965                         offset += nToCopy;
4966                         buffer += nToCopy;
4967                         nDone += nToCopy;
4968                 }
4969
4970         }
4971
4972         /* Update file object */
4973
4974         if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
4975                 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
4976
4977         in->dirty = 1;
4978
4979         return nDone;
4980 }
4981
4982
4983 /* ---------------------- File resizing stuff ------------------ */
4984
4985 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
4986 {
4987
4988         yaffs_Device *dev = in->myDev;
4989         int oldFileSize = in->variant.fileVariant.fileSize;
4990
4991         int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
4992
4993         int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
4994             dev->nDataBytesPerChunk;
4995         int i;
4996         int chunkId;
4997
4998         /* Delete backwards so that we don't end up with holes if
4999          * power is lost part-way through the operation.
5000          */
5001         for (i = lastDel; i >= startDel; i--) {
5002                 /* NB this could be optimised somewhat,
5003                  * eg. could retrieve the tags and write them without
5004                  * using yaffs_DeleteChunk
5005                  */
5006
5007                 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
5008                 if (chunkId > 0) {
5009                         if (chunkId <
5010                             (dev->internalStartBlock * dev->nChunksPerBlock)
5011                             || chunkId >=
5012                             ((dev->internalEndBlock +
5013                               1) * dev->nChunksPerBlock)) {
5014                                 T(YAFFS_TRACE_ALWAYS,
5015                                   (TSTR("Found daft chunkId %d for %d" TENDSTR),
5016                                    chunkId, i));
5017                         } else {
5018                                 in->nDataChunks--;
5019                                 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
5020                         }
5021                 }
5022         }
5023
5024 }
5025
5026 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
5027 {
5028
5029         int oldFileSize = in->variant.fileVariant.fileSize;
5030         __u32 newSizeOfPartialChunk;
5031         int newFullChunks;
5032
5033         yaffs_Device *dev = in->myDev;
5034
5035         yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
5036
5037         yaffs_FlushFilesChunkCache(in);
5038         yaffs_InvalidateWholeChunkCache(in);
5039
5040         yaffs_CheckGarbageCollection(dev);
5041
5042         if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
5043                 return YAFFS_FAIL;
5044
5045         if (newSize == oldFileSize)
5046                 return YAFFS_OK;
5047
5048         if (newSize < oldFileSize) {
5049
5050                 yaffs_PruneResizedChunks(in, newSize);
5051
5052                 if (newSizeOfPartialChunk != 0) {
5053                         int lastChunk = 1 + newFullChunks;
5054
5055                         __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
5056
5057                         /* Got to read and rewrite the last chunk with its new size and zero pad */
5058                         yaffs_ReadChunkDataFromObject(in, lastChunk,
5059                                                       localBuffer);
5060
5061                         memset(localBuffer + newSizeOfPartialChunk, 0,
5062                                dev->nDataBytesPerChunk - newSizeOfPartialChunk);
5063
5064                         yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
5065                                                      newSizeOfPartialChunk, 1);
5066
5067                         yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
5068                 }
5069
5070                 in->variant.fileVariant.fileSize = newSize;
5071
5072                 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
5073         } else {
5074                 /* newsSize > oldFileSize */
5075                 in->variant.fileVariant.fileSize = newSize;
5076         }
5077
5078
5079         /* Write a new object header to reflect the resize.
5080          * show we've shrunk the file, if need be
5081          * Do this only if the file is not in the deleted directories
5082          * and is not shadowed.
5083          */
5084         if (in->parent &&
5085             !in->isShadowed &&
5086             in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5087             in->parent->objectId != YAFFS_OBJECTID_DELETED)
5088                 yaffs_UpdateObjectHeader(in, NULL, 0,
5089                                          (newSize < oldFileSize) ? 1 : 0, 0);
5090
5091         return YAFFS_OK;
5092 }
5093
5094 loff_t yaffs_GetFileSize(yaffs_Object *obj)
5095 {
5096         YCHAR *alias = NULL;
5097         obj = yaffs_GetEquivalentObject(obj);
5098
5099         switch (obj->variantType) {
5100         case YAFFS_OBJECT_TYPE_FILE:
5101                 return obj->variant.fileVariant.fileSize;
5102         case YAFFS_OBJECT_TYPE_SYMLINK:
5103                 alias = obj->variant.symLinkVariant.alias;
5104                 if(!alias)
5105                         return 0;
5106                 return yaffs_strlen(alias);
5107         default:
5108                 return 0;
5109         }
5110 }
5111
5112
5113
5114 int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
5115 {
5116         int retVal;
5117         if (in->dirty) {
5118                 yaffs_FlushFilesChunkCache(in);
5119                 if(dataSync) /* Only sync data */
5120                         retVal=YAFFS_OK;
5121                 else {
5122                         if (updateTime) {
5123 #ifdef CONFIG_YAFFS_WINCE
5124                                 yfsd_WinFileTimeNow(in->win_mtime);
5125 #else
5126
5127                                 in->yst_mtime = Y_CURRENT_TIME;
5128
5129 #endif
5130                         }
5131
5132                         retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5133                                 0) ? YAFFS_OK : YAFFS_FAIL;
5134                 }
5135         } else {
5136                 retVal = YAFFS_OK;
5137         }
5138
5139         return retVal;
5140
5141 }
5142
5143 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
5144 {
5145
5146         /* First off, invalidate the file's data in the cache, without flushing. */
5147         yaffs_InvalidateWholeChunkCache(in);
5148
5149         if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5150                 /* Move to the unlinked directory so we have a record that it was deleted. */
5151                 yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
5152
5153         }
5154
5155         yaffs_RemoveObjectFromDirectory(in);
5156         yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
5157         in->hdrChunk = 0;
5158
5159         yaffs_FreeObject(in);
5160         return YAFFS_OK;
5161
5162 }
5163
5164 /* yaffs_DeleteFile deletes the whole file data
5165  * and the inode associated with the file.
5166  * It does not delete the links associated with the file.
5167  */
5168 static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
5169 {
5170
5171         int retVal;
5172         int immediateDeletion = 0;
5173
5174 #ifdef __KERNEL__
5175         if (!in->myInode)
5176                 immediateDeletion = 1;
5177 #else
5178         if (in->inUse <= 0)
5179                 immediateDeletion = 1;
5180 #endif
5181
5182         if (immediateDeletion) {
5183                 retVal =
5184                     yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5185                                            _Y("deleted"), 0, 0);
5186                 T(YAFFS_TRACE_TRACING,
5187                   (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5188                    in->objectId));
5189                 in->deleted = 1;
5190                 in->myDev->nDeletedFiles++;
5191                 if (1 || in->myDev->isYaffs2)
5192                         yaffs_ResizeFile(in, 0);
5193                 yaffs_SoftDeleteFile(in);
5194         } else {
5195                 retVal =
5196                     yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5197                                            _Y("unlinked"), 0, 0);
5198         }
5199
5200
5201         return retVal;
5202 }
5203
5204 int yaffs_DeleteFile(yaffs_Object *in)
5205 {
5206         int retVal = YAFFS_OK;
5207         int deleted = in->deleted;
5208
5209         yaffs_ResizeFile(in, 0);
5210
5211         if (in->nDataChunks > 0) {
5212                 /* Use soft deletion if there is data in the file.
5213                  * That won't be the case if it has been resized to zero.
5214                  */
5215                 if (!in->unlinked)
5216                         retVal = yaffs_UnlinkFileIfNeeded(in);
5217
5218                 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5219                         in->deleted = 1;
5220                         deleted = 1;
5221                         in->myDev->nDeletedFiles++;
5222                         yaffs_SoftDeleteFile(in);
5223                 }
5224                 return deleted ? YAFFS_OK : YAFFS_FAIL;
5225         } else {
5226                 /* The file has no data chunks so we toss it immediately */
5227                 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5228                 in->variant.fileVariant.top = NULL;
5229                 yaffs_DoGenericObjectDeletion(in);
5230
5231                 return YAFFS_OK;
5232         }
5233 }
5234
5235 static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
5236 {
5237         return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
5238                 !(ylist_empty(&obj->variant.directoryVariant.children));
5239 }
5240
5241 static int yaffs_DeleteDirectory(yaffs_Object *obj)
5242 {
5243         /* First check that the directory is empty. */
5244         if (yaffs_IsNonEmptyDirectory(obj))
5245                 return YAFFS_FAIL;
5246
5247         return yaffs_DoGenericObjectDeletion(obj);
5248 }
5249
5250 static int yaffs_DeleteSymLink(yaffs_Object *in)
5251 {
5252         if(in->variant.symLinkVariant.alias)
5253                 YFREE(in->variant.symLinkVariant.alias);
5254         in->variant.symLinkVariant.alias=NULL;
5255
5256         return yaffs_DoGenericObjectDeletion(in);
5257 }
5258
5259 static int yaffs_DeleteHardLink(yaffs_Object *in)
5260 {
5261         /* remove this hardlink from the list assocaited with the equivalent
5262          * object
5263          */
5264         ylist_del_init(&in->hardLinks);
5265         return yaffs_DoGenericObjectDeletion(in);
5266 }
5267
5268 int yaffs_DeleteObject(yaffs_Object *obj)
5269 {
5270 int retVal = -1;
5271         switch (obj->variantType) {
5272         case YAFFS_OBJECT_TYPE_FILE:
5273                 retVal = yaffs_DeleteFile(obj);
5274                 break;
5275         case YAFFS_OBJECT_TYPE_DIRECTORY:
5276                 return yaffs_DeleteDirectory(obj);
5277                 break;
5278         case YAFFS_OBJECT_TYPE_SYMLINK:
5279                 retVal = yaffs_DeleteSymLink(obj);
5280                 break;
5281         case YAFFS_OBJECT_TYPE_HARDLINK:
5282                 retVal = yaffs_DeleteHardLink(obj);
5283                 break;
5284         case YAFFS_OBJECT_TYPE_SPECIAL:
5285                 retVal = yaffs_DoGenericObjectDeletion(obj);
5286                 break;
5287         case YAFFS_OBJECT_TYPE_UNKNOWN:
5288                 retVal = 0;
5289                 break;          /* should not happen. */
5290         }
5291
5292         return retVal;
5293 }
5294
5295 static int yaffs_UnlinkWorker(yaffs_Object *obj)
5296 {
5297
5298         int immediateDeletion = 0;
5299
5300 #ifdef __KERNEL__
5301         if (!obj->myInode)
5302                 immediateDeletion = 1;
5303 #else
5304         if (obj->inUse <= 0)
5305                 immediateDeletion = 1;
5306 #endif
5307
5308         if(obj)
5309                 yaffs_UpdateParent(obj->parent);
5310
5311         if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5312                 return yaffs_DeleteHardLink(obj);
5313         } else if (!ylist_empty(&obj->hardLinks)) {
5314                 /* Curve ball: We're unlinking an object that has a hardlink.
5315                  *
5316                  * This problem arises because we are not strictly following
5317                  * The Linux link/inode model.
5318                  *
5319                  * We can't really delete the object.
5320                  * Instead, we do the following:
5321                  * - Select a hardlink.
5322                  * - Unhook it from the hard links
5323                  * - Unhook it from its parent directory (so that the rename can work)
5324                  * - Rename the object to the hardlink's name.
5325                  * - Delete the hardlink
5326                  */
5327
5328                 yaffs_Object *hl;
5329                 int retVal;
5330                 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5331
5332                 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5333
5334                 ylist_del_init(&hl->hardLinks);
5335                 ylist_del_init(&hl->siblings);
5336
5337                 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5338
5339                 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
5340
5341                 if (retVal == YAFFS_OK)
5342                         retVal = yaffs_DoGenericObjectDeletion(hl);
5343
5344                 return retVal;
5345
5346         } else if (immediateDeletion) {
5347                 switch (obj->variantType) {
5348                 case YAFFS_OBJECT_TYPE_FILE:
5349                         return yaffs_DeleteFile(obj);
5350                         break;
5351                 case YAFFS_OBJECT_TYPE_DIRECTORY:
5352                         return yaffs_DeleteDirectory(obj);
5353                         break;
5354                 case YAFFS_OBJECT_TYPE_SYMLINK:
5355                         return yaffs_DeleteSymLink(obj);
5356                         break;
5357                 case YAFFS_OBJECT_TYPE_SPECIAL:
5358                         return yaffs_DoGenericObjectDeletion(obj);
5359                         break;
5360                 case YAFFS_OBJECT_TYPE_HARDLINK:
5361                 case YAFFS_OBJECT_TYPE_UNKNOWN:
5362                 default:
5363                         return YAFFS_FAIL;
5364                 }
5365         } else if(yaffs_IsNonEmptyDirectory(obj))
5366                 return YAFFS_FAIL;
5367         else
5368                 return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
5369                                            _Y("unlinked"), 0, 0);
5370 }
5371
5372
5373 static int yaffs_UnlinkObject(yaffs_Object *obj)
5374 {
5375
5376         if (obj && obj->unlinkAllowed)
5377                 return yaffs_UnlinkWorker(obj);
5378
5379         return YAFFS_FAIL;
5380
5381 }
5382 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
5383 {
5384         yaffs_Object *obj;
5385
5386         obj = yaffs_FindObjectByName(dir, name);
5387         return yaffs_UnlinkObject(obj);
5388 }
5389
5390 /*----------------------- Initialisation Scanning ---------------------- */
5391
5392 static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
5393                                 int backwardScanning)
5394 {
5395         yaffs_Object *obj;
5396
5397         if (!backwardScanning) {
5398                 /* Handle YAFFS1 forward scanning case
5399                  * For YAFFS1 we always do the deletion
5400                  */
5401
5402         } else {
5403                 /* Handle YAFFS2 case (backward scanning)
5404                  * If the shadowed object exists then ignore.
5405                  */
5406                 obj = yaffs_FindObjectByNumber(dev, objId);
5407                 if(obj)
5408                         return;
5409         }
5410
5411         /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5412          * We put it in unlinked dir to be cleaned up after the scanning
5413          */
5414         obj =
5415             yaffs_FindOrCreateObjectByNumber(dev, objId,
5416                                              YAFFS_OBJECT_TYPE_FILE);
5417         if (!obj)
5418                 return;
5419         obj->isShadowed = 1;
5420         yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5421         obj->variant.fileVariant.shrinkSize = 0;
5422         obj->valid = 1;         /* So that we don't read any other info for this file */
5423
5424 }
5425
5426 typedef struct {
5427         int seq;
5428         int block;
5429 } yaffs_BlockIndex;
5430
5431
5432 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5433 {
5434         yaffs_Object *hl;
5435         yaffs_Object *in;
5436
5437         while (hardList) {
5438                 hl = hardList;
5439                 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5440
5441                 in = yaffs_FindObjectByNumber(dev,
5442                                               hl->variant.hardLinkVariant.
5443                                               equivalentObjectId);
5444
5445                 if (in) {
5446                         /* Add the hardlink pointers */
5447                         hl->variant.hardLinkVariant.equivalentObject = in;
5448                         ylist_add(&hl->hardLinks, &in->hardLinks);
5449                 } else {
5450                         /* Todo Need to report/handle this better.
5451                          * Got a problem... hardlink to a non-existant object
5452                          */
5453                         hl->variant.hardLinkVariant.equivalentObject = NULL;
5454                         YINIT_LIST_HEAD(&hl->hardLinks);
5455
5456                 }
5457         }
5458 }
5459
5460
5461
5462
5463
5464 static int ybicmp(const void *a, const void *b)
5465 {
5466         register int aseq = ((yaffs_BlockIndex *)a)->seq;
5467         register int bseq = ((yaffs_BlockIndex *)b)->seq;
5468         register int ablock = ((yaffs_BlockIndex *)a)->block;
5469         register int bblock = ((yaffs_BlockIndex *)b)->block;
5470         if (aseq == bseq)
5471                 return ablock - bblock;
5472         else
5473                 return aseq - bseq;
5474 }
5475
5476
5477 struct yaffs_ShadowFixerStruct {
5478         int objectId;
5479         int shadowedId;
5480         struct yaffs_ShadowFixerStruct *next;
5481 };
5482
5483
5484 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
5485 {
5486         /*
5487         *  Sort out state of unlinked and deleted objects after scanning.
5488         */
5489         struct ylist_head *i;
5490         struct ylist_head *n;
5491         yaffs_Object *l;
5492
5493         /* Soft delete all the unlinked files */
5494         ylist_for_each_safe(i, n,
5495                 &dev->unlinkedDir->variant.directoryVariant.children) {
5496                 if (i) {
5497                         l = ylist_entry(i, yaffs_Object, siblings);
5498                         yaffs_DeleteObject(l);
5499                 }
5500         }
5501
5502         ylist_for_each_safe(i, n,
5503                 &dev->deletedDir->variant.directoryVariant.children) {
5504                 if (i) {
5505                         l = ylist_entry(i, yaffs_Object, siblings);
5506                         yaffs_DeleteObject(l);
5507                 }
5508         }
5509
5510 }
5511
5512 /*
5513  * This code iterates through all the objects making sure that they are rooted.
5514  * Any unrooted objects are re-rooted in lost+found.
5515  * An object needs to be in one of:
5516  * - Directly under deleted, unlinked
5517  * - Directly or indirectly under root.
5518  *
5519  * Note:
5520  *  This code assumes that we don't ever change the current relationships between
5521  *  directories:
5522  *   rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL
5523  *   lostNfound->parent == rootDir
5524  *
5525  * This fixes the problem where directories might have inadvertently been deleted
5526  * leaving the object "hanging" without being rooted in the directory tree.
5527  */
5528
5529 static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj)
5530 {
5531         return (obj == dev->deletedDir ||
5532                 obj == dev->unlinkedDir||
5533                 obj == dev->rootDir);
5534 }
5535
5536 static void yaffs_FixHangingObjects(yaffs_Device *dev)
5537 {
5538         yaffs_Object *obj;
5539         yaffs_Object *parent;
5540         int i;
5541         struct ylist_head *lh;
5542         struct ylist_head *n;
5543         int depthLimit;
5544         int hanging;
5545
5546
5547         /* Iterate through the objects in each hash entry,
5548          * looking at each object.
5549          * Make sure it is rooted.
5550          */
5551
5552         for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
5553                 ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) {
5554                         if (lh) {
5555                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
5556                                 parent= obj->parent;
5557
5558                                 if(yaffs_HasNULLParent(dev,obj)){
5559                                         /* These directories are not hanging */
5560                                         hanging = 0;
5561                                 }
5562                                 else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5563                                         hanging = 1;
5564                                 else if(yaffs_HasNULLParent(dev,parent))
5565                                         hanging = 0;
5566                                 else {
5567                                         /*
5568                                          * Need to follow the parent chain to see if it is hanging.
5569                                          */
5570                                         hanging = 0;
5571                                         depthLimit=100;
5572
5573                                         while(parent != dev->rootDir &&
5574                                                 parent->parent &&
5575                                                 parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
5576                                                 depthLimit > 0){
5577                                                 parent = parent->parent;
5578                                                 depthLimit--;
5579                                         }
5580                                         if(parent != dev->rootDir)
5581                                                 hanging = 1;
5582                                 }
5583                                 if(hanging){
5584                                         T(YAFFS_TRACE_SCAN,
5585                                           (TSTR("Hanging object %d moved to lost and found" TENDSTR),
5586                                                 obj->objectId));
5587                                         yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj);
5588                                 }
5589                         }
5590                 }
5591         }
5592 }
5593
5594
5595 /*
5596  * Delete directory contents for cleaning up lost and found.
5597  */
5598 static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
5599 {
5600         yaffs_Object *obj;
5601         struct ylist_head *lh;
5602         struct ylist_head *n;
5603
5604         if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
5605                 YBUG();
5606
5607         ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) {
5608                 if (lh) {
5609                         obj = ylist_entry(lh, yaffs_Object, siblings);
5610                         if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
5611                                 yaffs_DeleteDirectoryContents(obj);
5612
5613                         T(YAFFS_TRACE_SCAN,
5614                                 (TSTR("Deleting lost_found object %d" TENDSTR),
5615                                 obj->objectId));
5616
5617                         /* Need to use UnlinkObject since Delete would not handle
5618                          * hardlinked objects correctly.
5619                          */
5620                         yaffs_UnlinkObject(obj);
5621                 }
5622         }
5623
5624 }
5625
5626 static void yaffs_EmptyLostAndFound(yaffs_Device *dev)
5627 {
5628         yaffs_DeleteDirectoryContents(dev->lostNFoundDir);
5629 }
5630
5631 static int yaffs_Scan(yaffs_Device *dev)
5632 {
5633         yaffs_ExtendedTags tags;
5634         int blk;
5635         int blockIterator;
5636         int startIterator;
5637         int endIterator;
5638         int result;
5639
5640         int chunk;
5641         int c;
5642         int deleted;
5643         yaffs_BlockState state;
5644         yaffs_Object *hardList = NULL;
5645         yaffs_BlockInfo *bi;
5646         __u32 sequenceNumber;
5647         yaffs_ObjectHeader *oh;
5648         yaffs_Object *in;
5649         yaffs_Object *parent;
5650
5651         int alloc_failed = 0;
5652
5653         struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
5654
5655
5656         __u8 *chunkData;
5657
5658
5659
5660         T(YAFFS_TRACE_SCAN,
5661           (TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
5662            dev->internalStartBlock, dev->internalEndBlock));
5663
5664         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5665
5666         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5667
5668         /* Scan all the blocks to determine their state */
5669         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5670                 bi = yaffs_GetBlockInfo(dev, blk);
5671                 yaffs_ClearChunkBits(dev, blk);
5672                 bi->pagesInUse = 0;
5673                 bi->softDeletions = 0;
5674
5675                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5676
5677                 bi->blockState = state;
5678                 bi->sequenceNumber = sequenceNumber;
5679
5680                 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
5681                         bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
5682
5683                 T(YAFFS_TRACE_SCAN_DEBUG,
5684                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5685                    state, sequenceNumber));
5686
5687                 if (state == YAFFS_BLOCK_STATE_DEAD) {
5688                         T(YAFFS_TRACE_BAD_BLOCKS,
5689                           (TSTR("block %d is bad" TENDSTR), blk));
5690                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5691                         T(YAFFS_TRACE_SCAN_DEBUG,
5692                           (TSTR("Block empty " TENDSTR)));
5693                         dev->nErasedBlocks++;
5694                         dev->nFreeChunks += dev->nChunksPerBlock;
5695                 }
5696         }
5697
5698         startIterator = dev->internalStartBlock;
5699         endIterator = dev->internalEndBlock;
5700
5701         /* For each block.... */
5702         for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5703              blockIterator++) {
5704
5705                 YYIELD();
5706
5707                 YYIELD();
5708
5709                 blk = blockIterator;
5710
5711                 bi = yaffs_GetBlockInfo(dev, blk);
5712                 state = bi->blockState;
5713
5714                 deleted = 0;
5715
5716                 /* For each chunk in each block that needs scanning....*/
5717                 for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
5718                      state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5719                         /* Read the tags and decide what to do */
5720                         chunk = blk * dev->nChunksPerBlock + c;
5721
5722                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5723                                                         &tags);
5724
5725                         /* Let's have a good look at this chunk... */
5726
5727                         if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
5728                                 /* YAFFS1 only...
5729                                  * A deleted chunk
5730                                  */
5731                                 deleted++;
5732                                 dev->nFreeChunks++;
5733                                 /*T((" %d %d deleted\n",blk,c)); */
5734                         } else if (!tags.chunkUsed) {
5735                                 /* An unassigned chunk in the block
5736                                  * This means that either the block is empty or
5737                                  * this is the one being allocated from
5738                                  */
5739
5740                                 if (c == 0) {
5741                                         /* We're looking at the first chunk in the block so the block is unused */
5742                                         state = YAFFS_BLOCK_STATE_EMPTY;
5743                                         dev->nErasedBlocks++;
5744                                 } else {
5745                                         /* this is the block being allocated from */
5746                                         T(YAFFS_TRACE_SCAN,
5747                                           (TSTR
5748                                            (" Allocating from %d %d" TENDSTR),
5749                                            blk, c));
5750                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
5751                                         dev->allocationBlock = blk;
5752                                         dev->allocationPage = c;
5753                                         dev->allocationBlockFinder = blk;
5754                                         /* Set it to here to encourage the allocator to go forth from here. */
5755
5756                                 }
5757
5758                                 dev->nFreeChunks += (dev->nChunksPerBlock - c);
5759                         } else if (tags.chunkId > 0) {
5760                                 /* chunkId > 0 so it is a data chunk... */
5761                                 unsigned int endpos;
5762
5763                                 yaffs_SetChunkBit(dev, blk, c);
5764                                 bi->pagesInUse++;
5765
5766                                 in = yaffs_FindOrCreateObjectByNumber(dev,
5767                                                                       tags.
5768                                                                       objectId,
5769                                                                       YAFFS_OBJECT_TYPE_FILE);
5770                                 /* PutChunkIntoFile checks for a clash (two data chunks with
5771                                  * the same chunkId).
5772                                  */
5773
5774                                 if (!in)
5775                                         alloc_failed = 1;
5776
5777                                 if (in) {
5778                                         if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
5779                                                 alloc_failed = 1;
5780                                 }
5781
5782                                 endpos =
5783                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5784                                     tags.byteCount;
5785                                 if (in &&
5786                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
5787                                     && in->variant.fileVariant.scannedFileSize <
5788                                     endpos) {
5789                                         in->variant.fileVariant.
5790                                             scannedFileSize = endpos;
5791                                         if (!dev->useHeaderFileSize) {
5792                                                 in->variant.fileVariant.
5793                                                     fileSize =
5794                                                     in->variant.fileVariant.
5795                                                     scannedFileSize;
5796                                         }
5797
5798                                 }
5799                                 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
5800                         } else {
5801                                 /* chunkId == 0, so it is an ObjectHeader.
5802                                  * Thus, we read in the object header and make the object
5803                                  */
5804                                 yaffs_SetChunkBit(dev, blk, c);
5805                                 bi->pagesInUse++;
5806
5807                                 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
5808                                                                 chunkData,
5809                                                                 NULL);
5810
5811                                 oh = (yaffs_ObjectHeader *) chunkData;
5812
5813                                 in = yaffs_FindObjectByNumber(dev,
5814                                                               tags.objectId);
5815                                 if (in && in->variantType != oh->type) {
5816                                         /* This should not happen, but somehow
5817                                          * Wev'e ended up with an objectId that has been reused but not yet
5818                                          * deleted, and worse still it has changed type. Delete the old object.
5819                                          */
5820
5821                                         yaffs_DeleteObject(in);
5822
5823                                         in = 0;
5824                                 }
5825
5826                                 in = yaffs_FindOrCreateObjectByNumber(dev,
5827                                                                       tags.
5828                                                                       objectId,
5829                                                                       oh->type);
5830
5831                                 if (!in)
5832                                         alloc_failed = 1;
5833
5834                                 if (in && oh->shadowsObject > 0) {
5835
5836                                         struct yaffs_ShadowFixerStruct *fixer;
5837                                         fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
5838                                         if (fixer) {
5839                                                 fixer->next = shadowFixerList;
5840                                                 shadowFixerList = fixer;
5841                                                 fixer->objectId = tags.objectId;
5842                                                 fixer->shadowedId = oh->shadowsObject;
5843                                         }
5844
5845                                 }
5846
5847                                 if (in && in->valid) {
5848                                         /* We have already filled this one. We have a duplicate and need to resolve it. */
5849
5850                                         unsigned existingSerial = in->serial;
5851                                         unsigned newSerial = tags.serialNumber;
5852
5853                                         if (((existingSerial + 1) & 3) == newSerial) {
5854                                                 /* Use new one - destroy the exisiting one */
5855                                                 yaffs_DeleteChunk(dev,
5856                                                                   in->hdrChunk,
5857                                                                   1, __LINE__);
5858                                                 in->valid = 0;
5859                                         } else {
5860                                                 /* Use existing - destroy this one. */
5861                                                 yaffs_DeleteChunk(dev, chunk, 1,
5862                                                                   __LINE__);
5863                                         }
5864                                 }
5865
5866                                 if (in && !in->valid &&
5867                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
5868                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
5869                                         /* We only load some info, don't fiddle with directory structure */
5870                                         in->valid = 1;
5871                                         in->variantType = oh->type;
5872
5873                                         in->yst_mode = oh->yst_mode;
5874 #ifdef CONFIG_YAFFS_WINCE
5875                                         in->win_atime[0] = oh->win_atime[0];
5876                                         in->win_ctime[0] = oh->win_ctime[0];
5877                                         in->win_mtime[0] = oh->win_mtime[0];
5878                                         in->win_atime[1] = oh->win_atime[1];
5879                                         in->win_ctime[1] = oh->win_ctime[1];
5880                                         in->win_mtime[1] = oh->win_mtime[1];
5881 #else
5882                                         in->yst_uid = oh->yst_uid;
5883                                         in->yst_gid = oh->yst_gid;
5884                                         in->yst_atime = oh->yst_atime;
5885                                         in->yst_mtime = oh->yst_mtime;
5886                                         in->yst_ctime = oh->yst_ctime;
5887                                         in->yst_rdev = oh->yst_rdev;
5888 #endif
5889                                         in->hdrChunk = chunk;
5890                                         in->serial = tags.serialNumber;
5891
5892                                 } else if (in && !in->valid) {
5893                                         /* we need to load this info */
5894
5895                                         in->valid = 1;
5896                                         in->variantType = oh->type;
5897
5898                                         in->yst_mode = oh->yst_mode;
5899 #ifdef CONFIG_YAFFS_WINCE
5900                                         in->win_atime[0] = oh->win_atime[0];
5901                                         in->win_ctime[0] = oh->win_ctime[0];
5902                                         in->win_mtime[0] = oh->win_mtime[0];
5903                                         in->win_atime[1] = oh->win_atime[1];
5904                                         in->win_ctime[1] = oh->win_ctime[1];
5905                                         in->win_mtime[1] = oh->win_mtime[1];
5906 #else
5907                                         in->yst_uid = oh->yst_uid;
5908                                         in->yst_gid = oh->yst_gid;
5909                                         in->yst_atime = oh->yst_atime;
5910                                         in->yst_mtime = oh->yst_mtime;
5911                                         in->yst_ctime = oh->yst_ctime;
5912                                         in->yst_rdev = oh->yst_rdev;
5913 #endif
5914                                         in->hdrChunk = chunk;
5915                                         in->serial = tags.serialNumber;
5916
5917                                         yaffs_SetObjectName(in, oh->name);
5918                                         in->dirty = 0;
5919
5920                                         /* directory stuff...
5921                                          * hook up to parent
5922                                          */
5923
5924                                         parent =
5925                                             yaffs_FindOrCreateObjectByNumber
5926                                             (dev, oh->parentObjectId,
5927                                              YAFFS_OBJECT_TYPE_DIRECTORY);
5928                                         if (!parent)
5929                                                 alloc_failed = 1;
5930                                         if (parent && parent->variantType ==
5931                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
5932                                                 /* Set up as a directory */
5933                                                 parent->variantType =
5934                                                         YAFFS_OBJECT_TYPE_DIRECTORY;
5935                                                 YINIT_LIST_HEAD(&parent->variant.
5936                                                                 directoryVariant.
5937                                                                 children);
5938                                         } else if (!parent || parent->variantType !=
5939                                                    YAFFS_OBJECT_TYPE_DIRECTORY) {
5940                                                 /* Hoosterman, another problem....
5941                                                  * We're trying to use a non-directory as a directory
5942                                                  */
5943
5944                                                 T(YAFFS_TRACE_ERROR,
5945                                                   (TSTR
5946                                                    ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
5947                                                     TENDSTR)));
5948                                                 parent = dev->lostNFoundDir;
5949                                         }
5950
5951                                         yaffs_AddObjectToDirectory(parent, in);
5952
5953                                         if (0 && (parent == dev->deletedDir ||
5954                                                   parent == dev->unlinkedDir)) {
5955                                                 in->deleted = 1;        /* If it is unlinked at start up then it wants deleting */
5956                                                 dev->nDeletedFiles++;
5957                                         }
5958                                         /* Note re hardlinks.
5959                                          * Since we might scan a hardlink before its equivalent object is scanned
5960                                          * we put them all in a list.
5961                                          * After scanning is complete, we should have all the objects, so we run through this
5962                                          * list and fix up all the chains.
5963                                          */
5964
5965                                         switch (in->variantType) {
5966                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
5967                                                 /* Todo got a problem */
5968                                                 break;
5969                                         case YAFFS_OBJECT_TYPE_FILE:
5970                                                 if (dev->useHeaderFileSize)
5971
5972                                                         in->variant.fileVariant.
5973                                                             fileSize =
5974                                                             oh->fileSize;
5975
5976                                                 break;
5977                                         case YAFFS_OBJECT_TYPE_HARDLINK:
5978                                                 in->variant.hardLinkVariant.
5979                                                         equivalentObjectId =
5980                                                         oh->equivalentObjectId;
5981                                                 in->hardLinks.next =
5982                                                         (struct ylist_head *)
5983                                                         hardList;
5984                                                 hardList = in;
5985                                                 break;
5986                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
5987                                                 /* Do nothing */
5988                                                 break;
5989                                         case YAFFS_OBJECT_TYPE_SPECIAL:
5990                                                 /* Do nothing */
5991                                                 break;
5992                                         case YAFFS_OBJECT_TYPE_SYMLINK:
5993                                                 in->variant.symLinkVariant.alias =
5994                                                     yaffs_CloneString(oh->alias);
5995                                                 if (!in->variant.symLinkVariant.alias)
5996                                                         alloc_failed = 1;
5997                                                 break;
5998                                         }
5999
6000 /*
6001                                         if (parent == dev->deletedDir) {
6002                                                 yaffs_DestroyObject(in);
6003                                                 bi->hasShrinkHeader = 1;
6004                                         }
6005 */
6006                                 }
6007                         }
6008                 }
6009
6010                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6011                         /* If we got this far while scanning, then the block is fully allocated.*/
6012                         state = YAFFS_BLOCK_STATE_FULL;
6013                 }
6014
6015                 bi->blockState = state;
6016
6017                 /* Now let's see if it was dirty */
6018                 if (bi->pagesInUse == 0 &&
6019                     !bi->hasShrinkHeader &&
6020                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6021                         yaffs_BlockBecameDirty(dev, blk);
6022                 }
6023
6024         }
6025
6026
6027         /* Ok, we've done all the scanning.
6028          * Fix up the hard link chains.
6029          * We should now have scanned all the objects, now it's time to add these
6030          * hardlinks.
6031          */
6032
6033         yaffs_HardlinkFixup(dev, hardList);
6034
6035         /* Fix up any shadowed objects */
6036         {
6037                 struct yaffs_ShadowFixerStruct *fixer;
6038                 yaffs_Object *obj;
6039
6040                 while (shadowFixerList) {
6041                         fixer = shadowFixerList;
6042                         shadowFixerList = fixer->next;
6043                         /* Complete the rename transaction by deleting the shadowed object
6044                          * then setting the object header to unshadowed.
6045                          */
6046                         obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
6047                         if (obj)
6048                                 yaffs_DeleteObject(obj);
6049
6050                         obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
6051
6052                         if (obj)
6053                                 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
6054
6055                         YFREE(fixer);
6056                 }
6057         }
6058
6059         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6060
6061         if (alloc_failed)
6062                 return YAFFS_FAIL;
6063
6064         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
6065
6066
6067         return YAFFS_OK;
6068 }
6069
6070 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
6071 {
6072         __u8 *chunkData;
6073         yaffs_ObjectHeader *oh;
6074         yaffs_Device *dev;
6075         yaffs_ExtendedTags tags;
6076         int result;
6077         int alloc_failed = 0;
6078
6079         if (!in)
6080                 return;
6081
6082         dev = in->myDev;
6083
6084 #if 0
6085         T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
6086                 in->objectId,
6087                 in->lazyLoaded ? "not yet" : "already"));
6088 #endif
6089
6090         if (in->lazyLoaded && in->hdrChunk > 0) {
6091                 in->lazyLoaded = 0;
6092                 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6093
6094                 result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
6095                 oh = (yaffs_ObjectHeader *) chunkData;
6096
6097                 in->yst_mode = oh->yst_mode;
6098 #ifdef CONFIG_YAFFS_WINCE
6099                 in->win_atime[0] = oh->win_atime[0];
6100                 in->win_ctime[0] = oh->win_ctime[0];
6101                 in->win_mtime[0] = oh->win_mtime[0];
6102                 in->win_atime[1] = oh->win_atime[1];
6103                 in->win_ctime[1] = oh->win_ctime[1];
6104                 in->win_mtime[1] = oh->win_mtime[1];
6105 #else
6106                 in->yst_uid = oh->yst_uid;
6107                 in->yst_gid = oh->yst_gid;
6108                 in->yst_atime = oh->yst_atime;
6109                 in->yst_mtime = oh->yst_mtime;
6110                 in->yst_ctime = oh->yst_ctime;
6111                 in->yst_rdev = oh->yst_rdev;
6112
6113 #endif
6114                 yaffs_SetObjectName(in, oh->name);
6115
6116                 if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
6117                         in->variant.symLinkVariant.alias =
6118                                                     yaffs_CloneString(oh->alias);
6119                         if (!in->variant.symLinkVariant.alias)
6120                                 alloc_failed = 1; /* Not returned to caller */
6121                 }
6122
6123                 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6124         }
6125 }
6126
6127 static int yaffs_ScanBackwards(yaffs_Device *dev)
6128 {
6129         yaffs_ExtendedTags tags;
6130         int blk;
6131         int blockIterator;
6132         int startIterator;
6133         int endIterator;
6134         int nBlocksToScan = 0;
6135
6136         int chunk;
6137         int result;
6138         int c;
6139         int deleted;
6140         yaffs_BlockState state;
6141         yaffs_Object *hardList = NULL;
6142         yaffs_BlockInfo *bi;
6143         __u32 sequenceNumber;
6144         yaffs_ObjectHeader *oh;
6145         yaffs_Object *in;
6146         yaffs_Object *parent;
6147         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
6148         int itsUnlinked;
6149         __u8 *chunkData;
6150
6151         int fileSize;
6152         int isShrink;
6153         int foundChunksInBlock;
6154         int equivalentObjectId;
6155         int alloc_failed = 0;
6156
6157
6158         yaffs_BlockIndex *blockIndex = NULL;
6159         int altBlockIndex = 0;
6160
6161         if (!dev->isYaffs2) {
6162                 T(YAFFS_TRACE_SCAN,
6163                   (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
6164                 return YAFFS_FAIL;
6165         }
6166
6167         T(YAFFS_TRACE_SCAN,
6168           (TSTR
6169            ("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..."
6170             TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
6171
6172
6173         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
6174
6175         blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
6176
6177         if (!blockIndex) {
6178                 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
6179                 altBlockIndex = 1;
6180         }
6181
6182         if (!blockIndex) {
6183                 T(YAFFS_TRACE_SCAN,
6184                   (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
6185                 return YAFFS_FAIL;
6186         }
6187
6188         dev->blocksInCheckpoint = 0;
6189
6190         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6191
6192         /* Scan all the blocks to determine their state */
6193         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6194                 bi = yaffs_GetBlockInfo(dev, blk);
6195                 yaffs_ClearChunkBits(dev, blk);
6196                 bi->pagesInUse = 0;
6197                 bi->softDeletions = 0;
6198
6199                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6200
6201                 bi->blockState = state;
6202                 bi->sequenceNumber = sequenceNumber;
6203
6204                 if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6205                         bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6206                 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6207                         bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6208
6209                 T(YAFFS_TRACE_SCAN_DEBUG,
6210                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6211                    state, sequenceNumber));
6212
6213
6214                 if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
6215                         dev->blocksInCheckpoint++;
6216
6217                 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6218                         T(YAFFS_TRACE_BAD_BLOCKS,
6219                           (TSTR("block %d is bad" TENDSTR), blk));
6220                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6221                         T(YAFFS_TRACE_SCAN_DEBUG,
6222                           (TSTR("Block empty " TENDSTR)));
6223                         dev->nErasedBlocks++;
6224                         dev->nFreeChunks += dev->nChunksPerBlock;
6225                 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6226
6227                         /* Determine the highest sequence number */
6228                         if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6229                             sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6230
6231                                 blockIndex[nBlocksToScan].seq = sequenceNumber;
6232                                 blockIndex[nBlocksToScan].block = blk;
6233
6234                                 nBlocksToScan++;
6235
6236                                 if (sequenceNumber >= dev->sequenceNumber)
6237                                         dev->sequenceNumber = sequenceNumber;
6238                         } else {
6239                                 /* TODO: Nasty sequence number! */
6240                                 T(YAFFS_TRACE_SCAN,
6241                                   (TSTR
6242                                    ("Block scanning block %d has bad sequence number %d"
6243                                     TENDSTR), blk, sequenceNumber));
6244
6245                         }
6246                 }
6247         }
6248
6249         T(YAFFS_TRACE_SCAN,
6250         (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6251
6252
6253
6254         YYIELD();
6255
6256         /* Sort the blocks */
6257 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6258         {
6259                 /* Use qsort now. */
6260                 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6261         }
6262 #else
6263         {
6264                 /* Dungy old bubble sort... */
6265
6266                 yaffs_BlockIndex temp;
6267                 int i;
6268                 int j;
6269
6270                 for (i = 0; i < nBlocksToScan; i++)
6271                         for (j = i + 1; j < nBlocksToScan; j++)
6272                                 if (blockIndex[i].seq > blockIndex[j].seq) {
6273                                         temp = blockIndex[j];
6274                                         blockIndex[j] = blockIndex[i];
6275                                         blockIndex[i] = temp;
6276                                 }
6277         }
6278 #endif
6279
6280         YYIELD();
6281
6282         T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6283
6284         /* Now scan the blocks looking at the data. */
6285         startIterator = 0;
6286         endIterator = nBlocksToScan - 1;
6287         T(YAFFS_TRACE_SCAN_DEBUG,
6288           (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6289
6290         /* For each block.... backwards */
6291         for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6292                         blockIterator--) {
6293                 /* Cooperative multitasking! This loop can run for so
6294                    long that watchdog timers expire. */
6295                 YYIELD();
6296
6297                 /* get the block to scan in the correct order */
6298                 blk = blockIndex[blockIterator].block;
6299
6300                 bi = yaffs_GetBlockInfo(dev, blk);
6301
6302
6303                 state = bi->blockState;
6304
6305                 deleted = 0;
6306
6307                 /* For each chunk in each block that needs scanning.... */
6308                 foundChunksInBlock = 0;
6309                 for (c = dev->nChunksPerBlock - 1;
6310                      !alloc_failed && c >= 0 &&
6311                      (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6312                       state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6313                         /* Scan backwards...
6314                          * Read the tags and decide what to do
6315                          */
6316
6317                         chunk = blk * dev->nChunksPerBlock + c;
6318
6319                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6320                                                         &tags);
6321
6322                         /* Let's have a good look at this chunk... */
6323
6324                         if (!tags.chunkUsed) {
6325                                 /* An unassigned chunk in the block.
6326                                  * If there are used chunks after this one, then
6327                                  * it is a chunk that was skipped due to failing the erased
6328                                  * check. Just skip it so that it can be deleted.
6329                                  * But, more typically, We get here when this is an unallocated
6330                                  * chunk and his means that either the block is empty or
6331                                  * this is the one being allocated from
6332                                  */
6333
6334                                 if (foundChunksInBlock) {
6335                                         /* This is a chunk that was skipped due to failing the erased check */
6336                                 } else if (c == 0) {
6337                                         /* We're looking at the first chunk in the block so the block is unused */
6338                                         state = YAFFS_BLOCK_STATE_EMPTY;
6339                                         dev->nErasedBlocks++;
6340                                 } else {
6341                                         if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6342                                             state == YAFFS_BLOCK_STATE_ALLOCATING) {
6343                                                 if (dev->sequenceNumber == bi->sequenceNumber) {
6344                                                         /* this is the block being allocated from */
6345
6346                                                         T(YAFFS_TRACE_SCAN,
6347                                                           (TSTR
6348                                                            (" Allocating from %d %d"
6349                                                             TENDSTR), blk, c));
6350
6351                                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
6352                                                         dev->allocationBlock = blk;
6353                                                         dev->allocationPage = c;
6354                                                         dev->allocationBlockFinder = blk;
6355                                                 } else {
6356                                                         /* This is a partially written block that is not
6357                                                          * the current allocation block. This block must have
6358                                                          * had a write failure, so set up for retirement.
6359                                                          */
6360
6361                                                          /* bi->needsRetiring = 1; ??? TODO */
6362                                                          bi->gcPrioritise = 1;
6363
6364                                                          T(YAFFS_TRACE_ALWAYS,
6365                                                          (TSTR("Partially written block %d detected" TENDSTR),
6366                                                          blk));
6367                                                 }
6368                                         }
6369                                 }
6370
6371                                 dev->nFreeChunks++;
6372
6373                         } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
6374                                 T(YAFFS_TRACE_SCAN,
6375                                   (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
6376                                   blk, c));
6377
6378                                   dev->nFreeChunks++;
6379
6380                         } else if (tags.chunkId > 0) {
6381                                 /* chunkId > 0 so it is a data chunk... */
6382                                 unsigned int endpos;
6383                                 __u32 chunkBase =
6384                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6385
6386                                 foundChunksInBlock = 1;
6387
6388
6389                                 yaffs_SetChunkBit(dev, blk, c);
6390                                 bi->pagesInUse++;
6391
6392                                 in = yaffs_FindOrCreateObjectByNumber(dev,
6393                                                                       tags.
6394                                                                       objectId,
6395                                                                       YAFFS_OBJECT_TYPE_FILE);
6396                                 if (!in) {
6397                                         /* Out of memory */
6398                                         alloc_failed = 1;
6399                                 }
6400
6401                                 if (in &&
6402                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
6403                                     && chunkBase <
6404                                     in->variant.fileVariant.shrinkSize) {
6405                                         /* This has not been invalidated by a resize */
6406                                         if (!yaffs_PutChunkIntoFile(in, tags.chunkId,
6407                                                                chunk, -1)) {
6408                                                 alloc_failed = 1;
6409                                         }
6410
6411                                         /* File size is calculated by looking at the data chunks if we have not
6412                                          * seen an object header yet. Stop this practice once we find an object header.
6413                                          */
6414                                         endpos =
6415                                             (tags.chunkId -
6416                                              1) * dev->nDataBytesPerChunk +
6417                                             tags.byteCount;
6418
6419                                         if (!in->valid &&       /* have not got an object header yet */
6420                                             in->variant.fileVariant.
6421                                             scannedFileSize < endpos) {
6422                                                 in->variant.fileVariant.
6423                                                     scannedFileSize = endpos;
6424                                                 in->variant.fileVariant.
6425                                                     fileSize =
6426                                                     in->variant.fileVariant.
6427                                                     scannedFileSize;
6428                                         }
6429
6430                                 } else if (in) {
6431                                         /* This chunk has been invalidated by a resize, so delete */
6432                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6433
6434                                 }
6435                         } else {
6436                                 /* chunkId == 0, so it is an ObjectHeader.
6437                                  * Thus, we read in the object header and make the object
6438                                  */
6439                                 foundChunksInBlock = 1;
6440
6441                                 yaffs_SetChunkBit(dev, blk, c);
6442                                 bi->pagesInUse++;
6443
6444                                 oh = NULL;
6445                                 in = NULL;
6446
6447                                 if (tags.extraHeaderInfoAvailable) {
6448                                         in = yaffs_FindOrCreateObjectByNumber
6449                                             (dev, tags.objectId,
6450                                              tags.extraObjectType);
6451                                         if (!in)
6452                                                 alloc_failed = 1;
6453                                 }
6454
6455                                 if (!in ||
6456                                     (!in->valid && dev->disableLazyLoad) ||
6457                                     tags.extraShadows ||
6458                                     (!in->valid &&
6459                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6460                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
6461
6462                                         /* If we don't have  valid info then we need to read the chunk
6463                                          * TODO In future we can probably defer reading the chunk and
6464                                          * living with invalid data until needed.
6465                                          */
6466
6467                                         result = yaffs_ReadChunkWithTagsFromNAND(dev,
6468                                                                         chunk,
6469                                                                         chunkData,
6470                                                                         NULL);
6471
6472                                         oh = (yaffs_ObjectHeader *) chunkData;
6473
6474                                         if (dev->inbandTags) {
6475                                                 /* Fix up the header if they got corrupted by inband tags */
6476                                                 oh->shadowsObject = oh->inbandShadowsObject;
6477                                                 oh->isShrink = oh->inbandIsShrink;
6478                                         }
6479
6480                                         if (!in) {
6481                                                 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6482                                                 if (!in)
6483                                                         alloc_failed = 1;
6484                                         }
6485
6486                                 }
6487
6488                                 if (!in) {
6489                                         /* TODO Hoosterman we have a problem! */
6490                                         T(YAFFS_TRACE_ERROR,
6491                                           (TSTR
6492                                            ("yaffs tragedy: Could not make object for object  %d at chunk %d during scan"
6493                                             TENDSTR), tags.objectId, chunk));
6494                                         continue;
6495                                 }
6496
6497                                 if (in->valid) {
6498                                         /* We have already filled this one.
6499                                          * We have a duplicate that will be discarded, but
6500                                          * we first have to suck out resize info if it is a file.
6501                                          */
6502
6503                                         if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6504                                              ((oh &&
6505                                                oh->type == YAFFS_OBJECT_TYPE_FILE) ||
6506                                               (tags.extraHeaderInfoAvailable  &&
6507                                                tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
6508                                                 __u32 thisSize =
6509                                                     (oh) ? oh->fileSize : tags.
6510                                                     extraFileLength;
6511                                                 __u32 parentObjectId =
6512                                                     (oh) ? oh->
6513                                                     parentObjectId : tags.
6514                                                     extraParentObjectId;
6515
6516
6517                                                 isShrink =
6518                                                     (oh) ? oh->isShrink : tags.
6519                                                     extraIsShrinkHeader;
6520
6521                                                 /* If it is deleted (unlinked at start also means deleted)
6522                                                  * we treat the file size as being zeroed at this point.
6523                                                  */
6524                                                 if (parentObjectId ==
6525                                                     YAFFS_OBJECTID_DELETED
6526                                                     || parentObjectId ==
6527                                                     YAFFS_OBJECTID_UNLINKED) {
6528                                                         thisSize = 0;
6529                                                         isShrink = 1;
6530                                                 }
6531
6532                                                 if (isShrink &&
6533                                                     in->variant.fileVariant.
6534                                                     shrinkSize > thisSize) {
6535                                                         in->variant.fileVariant.
6536                                                             shrinkSize =
6537                                                             thisSize;
6538                                                 }
6539
6540                                                 if (isShrink)
6541                                                         bi->hasShrinkHeader = 1;
6542
6543                                         }
6544                                         /* Use existing - destroy this one. */
6545                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6546
6547                                 }
6548
6549                                 if (!in->valid && in->variantType !=
6550                                     (oh ? oh->type : tags.extraObjectType))
6551                                         T(YAFFS_TRACE_ERROR, (
6552                                                 TSTR("yaffs tragedy: Bad object type, "
6553                                             TCONT("%d != %d, for object %d at chunk ")
6554                                             TCONT("%d during scan")
6555                                                 TENDSTR), oh ?
6556                                             oh->type : tags.extraObjectType,
6557                                             in->variantType, tags.objectId,
6558                                             chunk));
6559
6560                                 if (!in->valid &&
6561                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6562                                      tags.objectId ==
6563                                      YAFFS_OBJECTID_LOSTNFOUND)) {
6564                                         /* We only load some info, don't fiddle with directory structure */
6565                                         in->valid = 1;
6566
6567                                         if (oh) {
6568                                                 in->variantType = oh->type;
6569
6570                                                 in->yst_mode = oh->yst_mode;
6571 #ifdef CONFIG_YAFFS_WINCE
6572                                                 in->win_atime[0] = oh->win_atime[0];
6573                                                 in->win_ctime[0] = oh->win_ctime[0];
6574                                                 in->win_mtime[0] = oh->win_mtime[0];
6575                                                 in->win_atime[1] = oh->win_atime[1];
6576                                                 in->win_ctime[1] = oh->win_ctime[1];
6577                                                 in->win_mtime[1] = oh->win_mtime[1];
6578 #else
6579                                                 in->yst_uid = oh->yst_uid;
6580                                                 in->yst_gid = oh->yst_gid;
6581                                                 in->yst_atime = oh->yst_atime;
6582                                                 in->yst_mtime = oh->yst_mtime;
6583                                                 in->yst_ctime = oh->yst_ctime;
6584                                                 in->yst_rdev = oh->yst_rdev;
6585
6586 #endif
6587                                         } else {
6588                                                 in->variantType = tags.extraObjectType;
6589                                                 in->lazyLoaded = 1;
6590                                         }
6591
6592                                         in->hdrChunk = chunk;
6593
6594                                 } else if (!in->valid) {
6595                                         /* we need to load this info */
6596
6597                                         in->valid = 1;
6598                                         in->hdrChunk = chunk;
6599
6600                                         if (oh) {
6601                                                 in->variantType = oh->type;
6602
6603                                                 in->yst_mode = oh->yst_mode;
6604 #ifdef CONFIG_YAFFS_WINCE
6605                                                 in->win_atime[0] = oh->win_atime[0];
6606                                                 in->win_ctime[0] = oh->win_ctime[0];
6607                                                 in->win_mtime[0] = oh->win_mtime[0];
6608                                                 in->win_atime[1] = oh->win_atime[1];
6609                                                 in->win_ctime[1] = oh->win_ctime[1];
6610                                                 in->win_mtime[1] = oh->win_mtime[1];
6611 #else
6612                                                 in->yst_uid = oh->yst_uid;
6613                                                 in->yst_gid = oh->yst_gid;
6614                                                 in->yst_atime = oh->yst_atime;
6615                                                 in->yst_mtime = oh->yst_mtime;
6616                                                 in->yst_ctime = oh->yst_ctime;
6617                                                 in->yst_rdev = oh->yst_rdev;
6618 #endif
6619
6620                                                 if (oh->shadowsObject > 0)
6621                                                         yaffs_HandleShadowedObject(dev,
6622                                                                            oh->
6623                                                                            shadowsObject,
6624                                                                            1);
6625
6626
6627                                                 yaffs_SetObjectName(in, oh->name);
6628                                                 parent =
6629                                                     yaffs_FindOrCreateObjectByNumber
6630                                                         (dev, oh->parentObjectId,
6631                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6632
6633                                                  fileSize = oh->fileSize;
6634                                                  isShrink = oh->isShrink;
6635                                                  equivalentObjectId = oh->equivalentObjectId;
6636
6637                                         } else {
6638                                                 in->variantType = tags.extraObjectType;
6639                                                 parent =
6640                                                     yaffs_FindOrCreateObjectByNumber
6641                                                         (dev, tags.extraParentObjectId,
6642                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6643                                                  fileSize = tags.extraFileLength;
6644                                                  isShrink = tags.extraIsShrinkHeader;
6645                                                  equivalentObjectId = tags.extraEquivalentObjectId;
6646                                                 in->lazyLoaded = 1;
6647
6648                                         }
6649                                         in->dirty = 0;
6650
6651                                         if (!parent)
6652                                                 alloc_failed = 1;
6653
6654                                         /* directory stuff...
6655                                          * hook up to parent
6656                                          */
6657
6658                                         if (parent && parent->variantType ==
6659                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
6660                                                 /* Set up as a directory */
6661                                                 parent->variantType =
6662                                                         YAFFS_OBJECT_TYPE_DIRECTORY;
6663                                                 YINIT_LIST_HEAD(&parent->variant.
6664                                                         directoryVariant.
6665                                                         children);
6666                                         } else if (!parent || parent->variantType !=
6667                                                    YAFFS_OBJECT_TYPE_DIRECTORY) {
6668                                                 /* Hoosterman, another problem....
6669                                                  * We're trying to use a non-directory as a directory
6670                                                  */
6671
6672                                                 T(YAFFS_TRACE_ERROR,
6673                                                   (TSTR
6674                                                    ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6675                                                     TENDSTR)));
6676                                                 parent = dev->lostNFoundDir;
6677                                         }
6678
6679                                         yaffs_AddObjectToDirectory(parent, in);
6680
6681                                         itsUnlinked = (parent == dev->deletedDir) ||
6682                                                       (parent == dev->unlinkedDir);
6683
6684                                         if (isShrink) {
6685                                                 /* Mark the block as having a shrinkHeader */
6686                                                 bi->hasShrinkHeader = 1;
6687                                         }
6688
6689                                         /* Note re hardlinks.
6690                                          * Since we might scan a hardlink before its equivalent object is scanned
6691                                          * we put them all in a list.
6692                                          * After scanning is complete, we should have all the objects, so we run
6693                                          * through this list and fix up all the chains.
6694                                          */
6695
6696                                         switch (in->variantType) {
6697                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
6698                                                 /* Todo got a problem */
6699                                                 break;
6700                                         case YAFFS_OBJECT_TYPE_FILE:
6701
6702                                                 if (in->variant.fileVariant.
6703                                                     scannedFileSize < fileSize) {
6704                                                         /* This covers the case where the file size is greater
6705                                                          * than where the data is
6706                                                          * This will happen if the file is resized to be larger
6707                                                          * than its current data extents.
6708                                                          */
6709                                                         in->variant.fileVariant.fileSize = fileSize;
6710                                                         in->variant.fileVariant.scannedFileSize =
6711                                                             in->variant.fileVariant.fileSize;
6712                                                 }
6713
6714                                                 if (isShrink &&
6715                                                     in->variant.fileVariant.shrinkSize > fileSize) {
6716                                                         in->variant.fileVariant.shrinkSize = fileSize;
6717                                                 }
6718
6719                                                 break;
6720                                         case YAFFS_OBJECT_TYPE_HARDLINK:
6721                                                 if (!itsUnlinked) {
6722                                                         in->variant.hardLinkVariant.equivalentObjectId =
6723                                                                 equivalentObjectId;
6724                                                         in->hardLinks.next =
6725                                                                 (struct ylist_head *) hardList;
6726                                                         hardList = in;
6727                                                 }
6728                                                 break;
6729                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
6730                                                 /* Do nothing */
6731                                                 break;
6732                                         case YAFFS_OBJECT_TYPE_SPECIAL:
6733                                                 /* Do nothing */
6734                                                 break;
6735                                         case YAFFS_OBJECT_TYPE_SYMLINK:
6736                                                 if (oh) {
6737                                                         in->variant.symLinkVariant.alias =
6738                                                                 yaffs_CloneString(oh->alias);
6739                                                         if (!in->variant.symLinkVariant.alias)
6740                                                                 alloc_failed = 1;
6741                                                 }
6742                                                 break;
6743                                         }
6744
6745                                 }
6746
6747                         }
6748
6749                 } /* End of scanning for each chunk */
6750
6751                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6752                         /* If we got this far while scanning, then the block is fully allocated. */
6753                         state = YAFFS_BLOCK_STATE_FULL;
6754                 }
6755
6756                 bi->blockState = state;
6757
6758                 /* Now let's see if it was dirty */
6759                 if (bi->pagesInUse == 0 &&
6760                     !bi->hasShrinkHeader &&
6761                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6762                         yaffs_BlockBecameDirty(dev, blk);
6763                 }
6764
6765         }
6766
6767         if (altBlockIndex)
6768                 YFREE_ALT(blockIndex);
6769         else
6770                 YFREE(blockIndex);
6771
6772         /* Ok, we've done all the scanning.
6773          * Fix up the hard link chains.
6774          * We should now have scanned all the objects, now it's time to add these
6775          * hardlinks.
6776          */
6777         yaffs_HardlinkFixup(dev, hardList);
6778
6779
6780         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6781
6782         if (alloc_failed)
6783                 return YAFFS_FAIL;
6784
6785         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6786
6787         return YAFFS_OK;
6788 }
6789
6790 /*------------------------------  Directory Functions ----------------------------- */
6791
6792 static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
6793 {
6794         struct ylist_head *lh;
6795         yaffs_Object *listObj;
6796
6797         int count = 0;
6798
6799         if (!obj) {
6800                 T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
6801                 YBUG();
6802                 return;
6803         }
6804
6805         if (yaffs_SkipVerification(obj->myDev))
6806                 return;
6807
6808         if (!obj->parent) {
6809                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
6810                 YBUG();
6811                 return;
6812         }
6813
6814         if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6815                 T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
6816                 YBUG();
6817         }
6818
6819         /* Iterate through the objects in each hash entry */
6820
6821         ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
6822                 if (lh) {
6823                         listObj = ylist_entry(lh, yaffs_Object, siblings);
6824                         yaffs_VerifyObject(listObj);
6825                         if (obj == listObj)
6826                                 count++;
6827                 }
6828          }
6829
6830         if (count != 1) {
6831                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
6832                 YBUG();
6833         }
6834 }
6835
6836 static void yaffs_VerifyDirectory(yaffs_Object *directory)
6837 {
6838         struct ylist_head *lh;
6839         yaffs_Object *listObj;
6840
6841         if (!directory) {
6842                 YBUG();
6843                 return;
6844         }
6845
6846         if (yaffs_SkipFullVerification(directory->myDev))
6847                 return;
6848
6849         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6850                 T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
6851                 YBUG();
6852         }
6853
6854         /* Iterate through the objects in each hash entry */
6855
6856         ylist_for_each(lh, &directory->variant.directoryVariant.children) {
6857                 if (lh) {
6858                         listObj = ylist_entry(lh, yaffs_Object, siblings);
6859                         if (listObj->parent != directory) {
6860                                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
6861                                 YBUG();
6862                         }
6863                         yaffs_VerifyObjectInDirectory(listObj);
6864                 }
6865         }
6866 }
6867
6868 /*
6869  *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
6870  * link (ie. name) is created or deleted in the directory.
6871  *
6872  * ie.
6873  *   create dir/a : update dir's mtime/ctime
6874  *   rm dir/a:   update dir's mtime/ctime
6875  *   modify dir/a: don't update dir's mtimme/ctime
6876  */
6877
6878 static void yaffs_UpdateParent(yaffs_Object *obj)
6879 {
6880         if(!obj)
6881                 return;
6882
6883         obj->dirty = 1;
6884         obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
6885
6886         yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
6887 }
6888
6889 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
6890 {
6891         yaffs_Device *dev = obj->myDev;
6892         yaffs_Object *parent;
6893
6894         yaffs_VerifyObjectInDirectory(obj);
6895         parent = obj->parent;
6896
6897         yaffs_VerifyDirectory(parent);
6898
6899         if (dev && dev->removeObjectCallback)
6900                 dev->removeObjectCallback(obj);
6901
6902
6903         ylist_del_init(&obj->siblings);
6904         obj->parent = NULL;
6905
6906         yaffs_VerifyDirectory(parent);
6907 }
6908
6909 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
6910                                         yaffs_Object *obj)
6911 {
6912         if (!directory) {
6913                 T(YAFFS_TRACE_ALWAYS,
6914                   (TSTR
6915                    ("tragedy: Trying to add an object to a null pointer directory"
6916                     TENDSTR)));
6917                 YBUG();
6918                 return;
6919         }
6920         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6921                 T(YAFFS_TRACE_ALWAYS,
6922                   (TSTR
6923                    ("tragedy: Trying to add an object to a non-directory"
6924                     TENDSTR)));
6925                 YBUG();
6926         }
6927
6928         if (obj->siblings.prev == NULL) {
6929                 /* Not initialised */
6930                 YBUG();
6931         }
6932
6933
6934         yaffs_VerifyDirectory(directory);
6935
6936         yaffs_RemoveObjectFromDirectory(obj);
6937
6938
6939         /* Now add it */
6940         ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
6941         obj->parent = directory;
6942
6943         if (directory == obj->myDev->unlinkedDir
6944                         || directory == obj->myDev->deletedDir) {
6945                 obj->unlinked = 1;
6946                 obj->myDev->nUnlinkedFiles++;
6947                 obj->renameAllowed = 0;
6948         }
6949
6950         yaffs_VerifyDirectory(directory);
6951         yaffs_VerifyObjectInDirectory(obj);
6952 }
6953
6954 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
6955                                      const YCHAR *name)
6956 {
6957         int sum;
6958
6959         struct ylist_head *i;
6960         YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
6961
6962         yaffs_Object *l;
6963
6964         if (!name)
6965                 return NULL;
6966
6967         if (!directory) {
6968                 T(YAFFS_TRACE_ALWAYS,
6969                   (TSTR
6970                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
6971                     TENDSTR)));
6972                 YBUG();
6973                 return NULL;
6974         }
6975         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6976                 T(YAFFS_TRACE_ALWAYS,
6977                   (TSTR
6978                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6979                 YBUG();
6980         }
6981
6982         sum = yaffs_CalcNameSum(name);
6983
6984         ylist_for_each(i, &directory->variant.directoryVariant.children) {
6985                 if (i) {
6986                         l = ylist_entry(i, yaffs_Object, siblings);
6987
6988                         if (l->parent != directory)
6989                                 YBUG();
6990
6991                         yaffs_CheckObjectDetailsLoaded(l);
6992
6993                         /* Special case for lost-n-found */
6994                         if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6995                                 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
6996                                         return l;
6997                         } else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
6998                                 /* LostnFound chunk called Objxxx
6999                                  * Do a real check
7000                                  */
7001                                 yaffs_GetObjectName(l, buffer,
7002                                                     YAFFS_MAX_NAME_LENGTH + 1);
7003                                 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
7004                                         return l;
7005                         }
7006                 }
7007         }
7008
7009         return NULL;
7010 }
7011
7012
7013 #if 0
7014 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
7015                                         int (*fn) (yaffs_Object *))
7016 {
7017         struct ylist_head *i;
7018         yaffs_Object *l;
7019
7020         if (!theDir) {
7021                 T(YAFFS_TRACE_ALWAYS,
7022                   (TSTR
7023                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
7024                     TENDSTR)));
7025                 YBUG();
7026                 return YAFFS_FAIL;
7027         }
7028         if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
7029                 T(YAFFS_TRACE_ALWAYS,
7030                   (TSTR
7031                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
7032                 YBUG();
7033                 return YAFFS_FAIL;
7034         }
7035
7036         ylist_for_each(i, &theDir->variant.directoryVariant.children) {
7037                 if (i) {
7038                         l = ylist_entry(i, yaffs_Object, siblings);
7039                         if (l && !fn(l))
7040                                 return YAFFS_FAIL;
7041                 }
7042         }
7043
7044         return YAFFS_OK;
7045
7046 }
7047 #endif
7048
7049 /* GetEquivalentObject dereferences any hard links to get to the
7050  * actual object.
7051  */
7052
7053 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
7054 {
7055         if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
7056                 /* We want the object id of the equivalent object, not this one */
7057                 obj = obj->variant.hardLinkVariant.equivalentObject;
7058                 yaffs_CheckObjectDetailsLoaded(obj);
7059         }
7060         return obj;
7061 }
7062
7063 int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
7064 {
7065         memset(name, 0, buffSize * sizeof(YCHAR));
7066
7067         yaffs_CheckObjectDetailsLoaded(obj);
7068
7069         if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
7070                 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
7071         } else if (obj->hdrChunk <= 0) {
7072                 YCHAR locName[20];
7073                 YCHAR numString[20];
7074                 YCHAR *x = &numString[19];
7075                 unsigned v = obj->objectId;
7076                 numString[19] = 0;
7077                 while (v > 0) {
7078                         x--;
7079                         *x = '0' + (v % 10);
7080                         v /= 10;
7081                 }
7082                 /* make up a name */
7083                 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
7084                 yaffs_strcat(locName, x);
7085                 yaffs_strncpy(name, locName, buffSize - 1);
7086
7087         }
7088 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
7089         else if (obj->shortName[0])
7090                 yaffs_strcpy(name, obj->shortName);
7091 #endif
7092         else {
7093                 int result;
7094                 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
7095
7096                 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
7097
7098                 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
7099
7100                 if (obj->hdrChunk > 0) {
7101                         result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
7102                                                         obj->hdrChunk, buffer,
7103                                                         NULL);
7104                 }
7105                 yaffs_strncpy(name, oh->name, buffSize - 1);
7106
7107                 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
7108         }
7109
7110         return yaffs_strlen(name);
7111 }
7112
7113 int yaffs_GetObjectFileLength(yaffs_Object *obj)
7114 {
7115         /* Dereference any hard linking */
7116         obj = yaffs_GetEquivalentObject(obj);
7117
7118         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
7119                 return obj->variant.fileVariant.fileSize;
7120         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
7121                 if(!obj->variant.symLinkVariant.alias)
7122                         return 0;
7123                 return yaffs_strlen(obj->variant.symLinkVariant.alias);
7124         } else {
7125                 /* Only a directory should drop through to here */
7126                 return obj->myDev->nDataBytesPerChunk;
7127         }
7128 }
7129
7130 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
7131 {
7132         int count = 0;
7133         struct ylist_head *i;
7134
7135         if (!obj->unlinked)
7136                 count++;                /* the object itself */
7137
7138         ylist_for_each(i, &obj->hardLinks)
7139                 count++;                /* add the hard links; */
7140
7141         return count;
7142 }
7143
7144 int yaffs_GetObjectInode(yaffs_Object *obj)
7145 {
7146         obj = yaffs_GetEquivalentObject(obj);
7147
7148         return obj->objectId;
7149 }
7150
7151 unsigned yaffs_GetObjectType(yaffs_Object *obj)
7152 {
7153         obj = yaffs_GetEquivalentObject(obj);
7154
7155         switch (obj->variantType) {
7156         case YAFFS_OBJECT_TYPE_FILE:
7157                 return DT_REG;
7158                 break;
7159         case YAFFS_OBJECT_TYPE_DIRECTORY:
7160                 return DT_DIR;
7161                 break;
7162         case YAFFS_OBJECT_TYPE_SYMLINK:
7163                 return DT_LNK;
7164                 break;
7165         case YAFFS_OBJECT_TYPE_HARDLINK:
7166                 return DT_REG;
7167                 break;
7168         case YAFFS_OBJECT_TYPE_SPECIAL:
7169                 if (S_ISFIFO(obj->yst_mode))
7170                         return DT_FIFO;
7171                 if (S_ISCHR(obj->yst_mode))
7172                         return DT_CHR;
7173                 if (S_ISBLK(obj->yst_mode))
7174                         return DT_BLK;
7175                 if (S_ISSOCK(obj->yst_mode))
7176                         return DT_SOCK;
7177         default:
7178                 return DT_REG;
7179                 break;
7180         }
7181 }
7182
7183 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
7184 {
7185         obj = yaffs_GetEquivalentObject(obj);
7186         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
7187                 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
7188         else
7189                 return yaffs_CloneString(_Y(""));
7190 }
7191
7192 #ifndef CONFIG_YAFFS_WINCE
7193
7194 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
7195 {
7196         unsigned int valid = attr->ia_valid;
7197
7198         if (valid & ATTR_MODE)
7199                 obj->yst_mode = attr->ia_mode;
7200         if (valid & ATTR_UID)
7201                 obj->yst_uid = attr->ia_uid;
7202         if (valid & ATTR_GID)
7203                 obj->yst_gid = attr->ia_gid;
7204
7205         if (valid & ATTR_ATIME)
7206                 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
7207         if (valid & ATTR_CTIME)
7208                 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
7209         if (valid & ATTR_MTIME)
7210                 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
7211
7212         if (valid & ATTR_SIZE)
7213                 yaffs_ResizeFile(obj, attr->ia_size);
7214
7215         yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
7216
7217         return YAFFS_OK;
7218
7219 }
7220 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
7221 {
7222         unsigned int valid = 0;
7223
7224         attr->ia_mode = obj->yst_mode;
7225         valid |= ATTR_MODE;
7226         attr->ia_uid = obj->yst_uid;
7227         valid |= ATTR_UID;
7228         attr->ia_gid = obj->yst_gid;
7229         valid |= ATTR_GID;
7230
7231         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
7232         valid |= ATTR_ATIME;
7233         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
7234         valid |= ATTR_CTIME;
7235         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
7236         valid |= ATTR_MTIME;
7237
7238         attr->ia_size = yaffs_GetFileSize(obj);
7239         valid |= ATTR_SIZE;
7240
7241         attr->ia_valid = valid;
7242
7243         return YAFFS_OK;
7244 }
7245
7246 #endif
7247
7248 #if 0
7249 int yaffs_DumpObject(yaffs_Object *obj)
7250 {
7251         YCHAR name[257];
7252
7253         yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
7254
7255         T(YAFFS_TRACE_ALWAYS,
7256           (TSTR
7257            ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
7258             " chunk %d type %d size %d\n"
7259             TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
7260            obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
7261            yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
7262
7263         return YAFFS_OK;
7264 }
7265 #endif
7266
7267 /*---------------------------- Initialisation code -------------------------------------- */
7268
7269 static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
7270 {
7271
7272         /* Common functions, gotta have */
7273         if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
7274                 return 0;
7275
7276 #ifdef CONFIG_YAFFS_YAFFS2
7277
7278         /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
7279         if (dev->writeChunkWithTagsToNAND &&
7280             dev->readChunkWithTagsFromNAND &&
7281             !dev->writeChunkToNAND &&
7282             !dev->readChunkFromNAND &&
7283             dev->markNANDBlockBad && dev->queryNANDBlock)
7284                 return 1;
7285 #endif
7286
7287         /* Can use the "spare" style interface for yaffs1 */
7288         if (!dev->isYaffs2 &&
7289             !dev->writeChunkWithTagsToNAND &&
7290             !dev->readChunkWithTagsFromNAND &&
7291             dev->writeChunkToNAND &&
7292             dev->readChunkFromNAND &&
7293             !dev->markNANDBlockBad && !dev->queryNANDBlock)
7294                 return 1;
7295
7296         return 0;               /* bad */
7297 }
7298
7299
7300 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7301 {
7302         /* Initialise the unlinked, deleted, root and lost and found directories */
7303
7304         dev->lostNFoundDir = dev->rootDir =  NULL;
7305         dev->unlinkedDir = dev->deletedDir = NULL;
7306
7307         dev->unlinkedDir =
7308             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7309
7310         dev->deletedDir =
7311             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7312
7313         dev->rootDir =
7314             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7315                                       YAFFS_ROOT_MODE | S_IFDIR);
7316         dev->lostNFoundDir =
7317             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7318                                       YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7319
7320         if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
7321                 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7322                 return YAFFS_OK;
7323         }
7324
7325         return YAFFS_FAIL;
7326 }
7327
7328 int yaffs_GutsInitialise(yaffs_Device *dev)
7329 {
7330         int init_failed = 0;
7331         unsigned x;
7332         int bits;
7333
7334         T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7335
7336         /* Check stuff that must be set */
7337
7338         if (!dev) {
7339                 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7340                 return YAFFS_FAIL;
7341         }
7342
7343         dev->internalStartBlock = dev->startBlock;
7344         dev->internalEndBlock = dev->endBlock;
7345         dev->blockOffset = 0;
7346         dev->chunkOffset = 0;
7347         dev->nFreeChunks = 0;
7348
7349         dev->gcBlock = -1;
7350
7351         if (dev->startBlock == 0) {
7352                 dev->internalStartBlock = dev->startBlock + 1;
7353                 dev->internalEndBlock = dev->endBlock + 1;
7354                 dev->blockOffset = 1;
7355                 dev->chunkOffset = dev->nChunksPerBlock;
7356         }
7357
7358         /* Check geometry parameters. */
7359
7360         if ((!dev->inbandTags && dev->isYaffs2 && dev->totalBytesPerChunk < 1024) ||
7361             (!dev->isYaffs2 && dev->totalBytesPerChunk < 512) ||
7362             (dev->inbandTags && !dev->isYaffs2) ||
7363              dev->nChunksPerBlock < 2 ||
7364              dev->nReservedBlocks < 2 ||
7365              dev->internalStartBlock <= 0 ||
7366              dev->internalEndBlock <= 0 ||
7367              dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2)) {   /* otherwise it is too small */
7368                 T(YAFFS_TRACE_ALWAYS,
7369                   (TSTR
7370                    ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
7371                     TENDSTR), dev->totalBytesPerChunk, dev->isYaffs2 ? "2" : "", dev->inbandTags));
7372                 return YAFFS_FAIL;
7373         }
7374
7375         if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7376                 T(YAFFS_TRACE_ALWAYS,
7377                   (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7378                 return YAFFS_FAIL;
7379         }
7380
7381         /* Sort out space for inband tags, if required */
7382         if (dev->inbandTags)
7383                 dev->nDataBytesPerChunk = dev->totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
7384         else
7385                 dev->nDataBytesPerChunk = dev->totalBytesPerChunk;
7386
7387         /* Got the right mix of functions? */
7388         if (!yaffs_CheckDevFunctions(dev)) {
7389                 /* Function missing */
7390                 T(YAFFS_TRACE_ALWAYS,
7391                   (TSTR
7392                    ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7393
7394                 return YAFFS_FAIL;
7395         }
7396
7397         /* This is really a compilation check. */
7398         if (!yaffs_CheckStructures()) {
7399                 T(YAFFS_TRACE_ALWAYS,
7400                   (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7401                 return YAFFS_FAIL;
7402         }
7403
7404         if (dev->isMounted) {
7405                 T(YAFFS_TRACE_ALWAYS,
7406                   (TSTR("yaffs: device already mounted\n" TENDSTR)));
7407                 return YAFFS_FAIL;
7408         }
7409
7410         /* Finished with most checks. One or two more checks happen later on too. */
7411
7412         dev->isMounted = 1;
7413
7414         /* OK now calculate a few things for the device */
7415
7416         /*
7417          *  Calculate all the chunk size manipulation numbers:
7418          */
7419         x = dev->nDataBytesPerChunk;
7420         /* We always use dev->chunkShift and dev->chunkDiv */
7421         dev->chunkShift = Shifts(x);
7422         x >>= dev->chunkShift;
7423         dev->chunkDiv = x;
7424         /* We only use chunk mask if chunkDiv is 1 */
7425         dev->chunkMask = (1<<dev->chunkShift) - 1;
7426
7427         /*
7428          * Calculate chunkGroupBits.
7429          * We need to find the next power of 2 > than internalEndBlock
7430          */
7431
7432         x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
7433
7434         bits = ShiftsGE(x);
7435
7436         /* Set up tnode width if wide tnodes are enabled. */
7437         if (!dev->wideTnodesDisabled) {
7438                 /* bits must be even so that we end up with 32-bit words */
7439                 if (bits & 1)
7440                         bits++;
7441                 if (bits < 16)
7442                         dev->tnodeWidth = 16;
7443                 else
7444                         dev->tnodeWidth = bits;
7445         } else
7446                 dev->tnodeWidth = 16;
7447
7448         dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7449
7450         /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7451          * so if the bitwidth of the
7452          * chunk range we're using is greater than 16 we need
7453          * to figure out chunk shift and chunkGroupSize
7454          */
7455
7456         if (bits <= dev->tnodeWidth)
7457                 dev->chunkGroupBits = 0;
7458         else
7459                 dev->chunkGroupBits = bits - dev->tnodeWidth;
7460
7461
7462         dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7463
7464         if (dev->nChunksPerBlock < dev->chunkGroupSize) {
7465                 /* We have a problem because the soft delete won't work if
7466                  * the chunk group size > chunks per block.
7467                  * This can be remedied by using larger "virtual blocks".
7468                  */
7469                 T(YAFFS_TRACE_ALWAYS,
7470                   (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7471
7472                 return YAFFS_FAIL;
7473         }
7474
7475         /* OK, we've finished verifying the device, lets continue with initialisation */
7476
7477         /* More device initialisation */
7478         dev->garbageCollections = 0;
7479         dev->passiveGarbageCollections = 0;
7480         dev->currentDirtyChecker = 0;
7481         dev->bufferedBlock = -1;
7482         dev->doingBufferedBlockRewrite = 0;
7483         dev->nDeletedFiles = 0;
7484         dev->nBackgroundDeletions = 0;
7485         dev->nUnlinkedFiles = 0;
7486         dev->eccFixed = 0;
7487         dev->eccUnfixed = 0;
7488         dev->tagsEccFixed = 0;
7489         dev->tagsEccUnfixed = 0;
7490         dev->nErasureFailures = 0;
7491         dev->nErasedBlocks = 0;
7492         dev->isDoingGC = 0;
7493         dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7494
7495         /* Initialise temporary buffers and caches. */
7496         if (!yaffs_InitialiseTempBuffers(dev))
7497                 init_failed = 1;
7498
7499         dev->srCache = NULL;
7500         dev->gcCleanupList = NULL;
7501
7502
7503         if (!init_failed &&
7504             dev->nShortOpCaches > 0) {
7505                 int i;
7506                 void *buf;
7507                 int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
7508
7509                 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
7510                         dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7511
7512                 dev->srCache =  YMALLOC(srCacheBytes);
7513
7514                 buf = (__u8 *) dev->srCache;
7515
7516                 if (dev->srCache)
7517                         memset(dev->srCache, 0, srCacheBytes);
7518
7519                 for (i = 0; i < dev->nShortOpCaches && buf; i++) {
7520                         dev->srCache[i].object = NULL;
7521                         dev->srCache[i].lastUse = 0;
7522                         dev->srCache[i].dirty = 0;
7523                         dev->srCache[i].data = buf = YMALLOC_DMA(dev->totalBytesPerChunk);
7524                 }
7525                 if (!buf)
7526                         init_failed = 1;
7527
7528                 dev->srLastUse = 0;
7529         }
7530
7531         dev->cacheHits = 0;
7532
7533         if (!init_failed) {
7534                 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
7535                 if (!dev->gcCleanupList)
7536                         init_failed = 1;
7537         }
7538
7539         if (dev->isYaffs2)
7540                 dev->useHeaderFileSize = 1;
7541
7542         if (!init_failed && !yaffs_InitialiseBlocks(dev))
7543                 init_failed = 1;
7544
7545         yaffs_InitialiseTnodes(dev);
7546         yaffs_InitialiseObjects(dev);
7547
7548         if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7549                 init_failed = 1;
7550
7551
7552         if (!init_failed) {
7553                 /* Now scan the flash. */
7554                 if (dev->isYaffs2) {
7555                         if (yaffs_CheckpointRestore(dev)) {
7556                                 yaffs_CheckObjectDetailsLoaded(dev->rootDir);
7557                                 T(YAFFS_TRACE_ALWAYS,
7558                                   (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7559                         } else {
7560
7561                                 /* Clean up the mess caused by an aborted checkpoint load
7562                                  * and scan backwards.
7563                                  */
7564                                 yaffs_DeinitialiseBlocks(dev);
7565                                 yaffs_DeinitialiseTnodes(dev);
7566                                 yaffs_DeinitialiseObjects(dev);
7567
7568
7569                                 dev->nErasedBlocks = 0;
7570                                 dev->nFreeChunks = 0;
7571                                 dev->allocationBlock = -1;
7572                                 dev->allocationPage = -1;
7573                                 dev->nDeletedFiles = 0;
7574                                 dev->nUnlinkedFiles = 0;
7575                                 dev->nBackgroundDeletions = 0;
7576                                 dev->oldestDirtySequence = 0;
7577
7578                                 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7579                                         init_failed = 1;
7580
7581                                 yaffs_InitialiseTnodes(dev);
7582                                 yaffs_InitialiseObjects(dev);
7583
7584                                 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7585                                         init_failed = 1;
7586
7587                                 if (!init_failed && !yaffs_ScanBackwards(dev))
7588                                         init_failed = 1;
7589                         }
7590                 } else if (!yaffs_Scan(dev))
7591                                 init_failed = 1;
7592
7593                 yaffs_StripDeletedObjects(dev);
7594                 yaffs_FixHangingObjects(dev);
7595                 if(dev->emptyLostAndFound)
7596                         yaffs_EmptyLostAndFound(dev);
7597         }
7598
7599         if (init_failed) {
7600                 /* Clean up the mess */
7601                 T(YAFFS_TRACE_TRACING,
7602                   (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7603
7604                 yaffs_Deinitialise(dev);
7605                 return YAFFS_FAIL;
7606         }
7607
7608         /* Zero out stats */
7609         dev->nPageReads = 0;
7610         dev->nPageWrites = 0;
7611         dev->nBlockErasures = 0;
7612         dev->nGCCopies = 0;
7613         dev->nRetriedWrites = 0;
7614
7615         dev->nRetiredBlocks = 0;
7616
7617         yaffs_VerifyFreeChunks(dev);
7618         yaffs_VerifyBlocks(dev);
7619
7620         /* Clean up any aborted checkpoint data */
7621         if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
7622                 yaffs_InvalidateCheckpoint(dev);
7623
7624         T(YAFFS_TRACE_TRACING,
7625           (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7626         return YAFFS_OK;
7627
7628 }
7629
7630 void yaffs_Deinitialise(yaffs_Device *dev)
7631 {
7632         if (dev->isMounted) {
7633                 int i;
7634
7635                 yaffs_DeinitialiseBlocks(dev);
7636                 yaffs_DeinitialiseTnodes(dev);
7637                 yaffs_DeinitialiseObjects(dev);
7638                 if (dev->nShortOpCaches > 0 &&
7639                     dev->srCache) {
7640
7641                         for (i = 0; i < dev->nShortOpCaches; i++) {
7642                                 if (dev->srCache[i].data)
7643                                         YFREE(dev->srCache[i].data);
7644                                 dev->srCache[i].data = NULL;
7645                         }
7646
7647                         YFREE(dev->srCache);
7648                         dev->srCache = NULL;
7649                 }
7650
7651                 YFREE(dev->gcCleanupList);
7652
7653                 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
7654                         YFREE(dev->tempBuffer[i].buffer);
7655
7656                 dev->isMounted = 0;
7657
7658                 if (dev->deinitialiseNAND)
7659                         dev->deinitialiseNAND(dev);
7660         }
7661 }
7662
7663 static int yaffs_CountFreeChunks(yaffs_Device *dev)
7664 {
7665         int nFree;
7666         int b;
7667
7668         yaffs_BlockInfo *blk;
7669
7670         for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7671                         b++) {
7672                 blk = yaffs_GetBlockInfo(dev, b);
7673
7674                 switch (blk->blockState) {
7675                 case YAFFS_BLOCK_STATE_EMPTY:
7676                 case YAFFS_BLOCK_STATE_ALLOCATING:
7677                 case YAFFS_BLOCK_STATE_COLLECTING:
7678                 case YAFFS_BLOCK_STATE_FULL:
7679                         nFree +=
7680                             (dev->nChunksPerBlock - blk->pagesInUse +
7681                              blk->softDeletions);
7682                         break;
7683                 default:
7684                         break;
7685                 }
7686         }
7687
7688         return nFree;
7689 }
7690
7691 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
7692 {
7693         /* This is what we report to the outside world */
7694
7695         int nFree;
7696         int nDirtyCacheChunks;
7697         int blocksForCheckpoint;
7698         int i;
7699
7700 #if 1
7701         nFree = dev->nFreeChunks;
7702 #else
7703         nFree = yaffs_CountFreeChunks(dev);
7704 #endif
7705
7706         nFree += dev->nDeletedFiles;
7707
7708         /* Now count the number of dirty chunks in the cache and subtract those */
7709
7710         for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
7711                 if (dev->srCache[i].dirty)
7712                         nDirtyCacheChunks++;
7713         }
7714
7715         nFree -= nDirtyCacheChunks;
7716
7717         nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
7718
7719         /* Now we figure out how much to reserve for the checkpoint and report that... */
7720         blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
7721         if (blocksForCheckpoint < 0)
7722                 blocksForCheckpoint = 0;
7723
7724         nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
7725
7726         if (nFree < 0)
7727                 nFree = 0;
7728
7729         return nFree;
7730
7731 }
7732
7733 static int yaffs_freeVerificationFailures;
7734
7735 static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
7736 {
7737         int counted;
7738         int difference;
7739
7740         if (yaffs_SkipVerification(dev))
7741                 return;
7742
7743         counted = yaffs_CountFreeChunks(dev);
7744
7745         difference = dev->nFreeChunks - counted;
7746
7747         if (difference) {
7748                 T(YAFFS_TRACE_ALWAYS,
7749                   (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7750                    dev->nFreeChunks, counted, difference));
7751                 yaffs_freeVerificationFailures++;
7752         }
7753 }
7754
7755 /*---------------------------------------- YAFFS test code ----------------------*/
7756
7757 #define yaffs_CheckStruct(structure, syze, name) \
7758         do { \
7759                 if (sizeof(structure) != syze) { \
7760                         T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
7761                                 name, syze, sizeof(structure))); \
7762                         return YAFFS_FAIL; \
7763                 } \
7764         } while (0)
7765
7766 static int yaffs_CheckStructures(void)
7767 {
7768 /*      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
7769 /*      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
7770 /*      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
7771 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7772         yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode");
7773 #endif
7774 #ifndef CONFIG_YAFFS_WINCE
7775         yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");
7776 #endif
7777         return YAFFS_OK;
7778 }