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 1.90 2009-09-23 23:24:55 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
 117 /* Function to calculate chunk and offset */
 118
 119 static void yaffs_AddrToChunk(yaffs_Device *dev, loff_t addr, int *chunkOut,
 120                 __u32 *offsetOut)
 121 {
 122         int chunk;
 123         __u32 offset;
 124
 125         chunk  = (__u32)(addr >> dev->chunkShift);
 126
 127         if (dev->chunkDiv == 1) {
 128                 /* easy power of 2 case */
 129                 offset = (__u32)(addr & dev->chunkMask);
 130         } else {
 131                 /* Non power-of-2 case */
 132
 133                 loff_t chunkBase;
 134
 135                 chunk /= dev->chunkDiv;
 136
 137                 chunkBase = ((loff_t)chunk) * dev->nDataBytesPerChunk;
 138                 offset = (__u32)(addr - chunkBase);
 139         }
 140
 141         *chunkOut = chunk;
 142         *offsetOut = offset;
 143 }
 144
 145 /* Function to return the number of shifts for a power of 2 greater than or
 146  * equal to the given number
 147  * Note we don't try to cater for all possible numbers and this does not have to
 148  * be hellishly efficient.
 149  */
 150
 151 static __u32 ShiftsGE(__u32 x)
 152 {
 153         int extraBits;
 154         int nShifts;
 155
 156         nShifts = extraBits = 0;
 157
 158         while (x > 1) {
 159                 if (x & 1)
 160                         extraBits++;
 161                 x >>= 1;
 162                 nShifts++;
 163         }
 164
 165         if (extraBits)
 166                 nShifts++;
 167
 168         return nShifts;
 169 }
 170
 171 /* Function to return the number of shifts to get a 1 in bit 0
 172  */
 173
 174 static __u32 Shifts(__u32 x)
 175 {
 176         int nShifts;
 177
 178         nShifts =  0;
 179
 180         if (!x)
 181                 return 0;
 182
 183         while (!(x&1)) {
 184                 x >>= 1;
 185                 nShifts++;
 186         }
 187
 188         return nShifts;
 189 }
 190
 191
 192
 193 /*
 194  * Temporary buffer manipulations.
 195  */
 196
 197 static int yaffs_InitialiseTempBuffers(yaffs_Device *dev)
 198 {
 199         int i;
 200         __u8 *buf = (__u8 *)1;
 201
 202         memset(dev->tempBuffer, 0, sizeof(dev->tempBuffer));
 203
 204         for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
 205                 dev->tempBuffer[i].line = 0;    /* not in use */
 206                 dev->tempBuffer[i].buffer = buf =
 207                     YMALLOC_DMA(dev->totalBytesPerChunk);
 208         }
 209
 210         return buf ? YAFFS_OK : YAFFS_FAIL;
 211 }
 212
 213 __u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo)
 214 {
 215         int i, j;
 216
 217         dev->tempInUse++;
 218         if (dev->tempInUse > dev->maxTemp)
 219                 dev->maxTemp = dev->tempInUse;
 220
 221         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 222                 if (dev->tempBuffer[i].line == 0) {
 223                         dev->tempBuffer[i].line = lineNo;
 224                         if ((i + 1) > dev->maxTemp) {
 225                                 dev->maxTemp = i + 1;
 226                                 for (j = 0; j <= i; j++)
 227                                         dev->tempBuffer[j].maxLine =
 228                                             dev->tempBuffer[j].line;
 229                         }
 230
 231                         return dev->tempBuffer[i].buffer;
 232                 }
 233         }
 234
 235         T(YAFFS_TRACE_BUFFERS,
 236           (TSTR("Out of temp buffers at line %d, other held by lines:"),
 237            lineNo));
 238         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
 239                 T(YAFFS_TRACE_BUFFERS, (TSTR(" %d "), dev->tempBuffer[i].line));
 240
 241         T(YAFFS_TRACE_BUFFERS, (TSTR(" " TENDSTR)));
 242
 243         /*
 244          * If we got here then we have to allocate an unmanaged one
 245          * This is not good.
 246          */
 247
 248         dev->unmanagedTempAllocations++;
 249         return YMALLOC(dev->nDataBytesPerChunk);
 250
 251 }
 252
 253 void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer,
 254                                     int lineNo)
 255 {
 256         int i;
 257
 258         dev->tempInUse--;
 259
 260         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 261                 if (dev->tempBuffer[i].buffer == buffer) {
 262                         dev->tempBuffer[i].line = 0;
 263                         return;
 264                 }
 265         }
 266
 267         if (buffer) {
 268                 /* assume it is an unmanaged one. */
 269                 T(YAFFS_TRACE_BUFFERS,
 270                   (TSTR("Releasing unmanaged temp buffer in line %d" TENDSTR),
 271                    lineNo));
 272                 YFREE(buffer);
 273                 dev->unmanagedTempDeallocations++;
 274         }
 275
 276 }
 277
 278 /*
 279  * Determine if we have a managed buffer.
 280  */
 281 int yaffs_IsManagedTempBuffer(yaffs_Device *dev, const __u8 *buffer)
 282 {
 283         int i;
 284
 285         for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
 286                 if (dev->tempBuffer[i].buffer == buffer)
 287                         return 1;
 288         }
 289
 290         for (i = 0; i < dev->nShortOpCaches; i++) {
 291                 if (dev->srCache[i].data == buffer)
 292                         return 1;
 293         }
 294
 295         if (buffer == dev->checkpointBuffer)
 296                 return 1;
 297
 298         T(YAFFS_TRACE_ALWAYS,
 299                 (TSTR("yaffs: unmaged buffer detected.\n" TENDSTR)));
 300         return 0;
 301 }
 302
 303
 304
 305 /*
 306  * Chunk bitmap manipulations
 307  */
 308
 309 static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
 310 {
 311         if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
 312                 T(YAFFS_TRACE_ERROR,
 313                         (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
 314                         blk));
 315                 YBUG();
 316         }
 317         return dev->chunkBits +
 318                 (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
 319 }
 320
 321 static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
 322 {
 323         if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
 324                         chunk < 0 || chunk >= dev->nChunksPerBlock) {
 325                 T(YAFFS_TRACE_ERROR,
 326                 (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
 327                         blk, chunk));
 328                 YBUG();
 329         }
 330 }
 331
 332 static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
 333 {
 334         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 335
 336         memset(blkBits, 0, dev->chunkBitmapStride);
 337 }
 338
 339 static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk)
 340 {
 341         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 342
 343         yaffs_VerifyChunkBitId(dev, blk, chunk);
 344
 345         blkBits[chunk / 8] &= ~(1 << (chunk & 7));
 346 }
 347
 348 static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk)
 349 {
 350         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 351
 352         yaffs_VerifyChunkBitId(dev, blk, chunk);
 353
 354         blkBits[chunk / 8] |= (1 << (chunk & 7));
 355 }
 356
 357 static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk)
 358 {
 359         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 360         yaffs_VerifyChunkBitId(dev, blk, chunk);
 361
 362         return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
 363 }
 364
 365 static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk)
 366 {
 367         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 368         int i;
 369         for (i = 0; i < dev->chunkBitmapStride; i++) {
 370                 if (*blkBits)
 371                         return 1;
 372                 blkBits++;
 373         }
 374         return 0;
 375 }
 376
 377 static int yaffs_CountChunkBits(yaffs_Device *dev, int blk)
 378 {
 379         __u8 *blkBits = yaffs_BlockBits(dev, blk);
 380         int i;
 381         int n = 0;
 382         for (i = 0; i < dev->chunkBitmapStride; i++) {
 383                 __u8 x = *blkBits;
 384                 while (x) {
 385                         if (x & 1)
 386                                 n++;
 387                         x >>= 1;
 388                 }
 389
 390                 blkBits++;
 391         }
 392         return n;
 393 }
 394
 395 /*
 396  * Verification code
 397  */
 398
 399 static int yaffs_SkipVerification(yaffs_Device *dev)
 400 {
 401         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
 402 }
 403
 404 static int yaffs_SkipFullVerification(yaffs_Device *dev)
 405 {
 406         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
 407 }
 408
 409 static int yaffs_SkipNANDVerification(yaffs_Device *dev)
 410 {
 411         return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
 412 }
 413
 414 static const char *blockStateName[] = {
 415 "Unknown",
 416 "Needs scanning",
 417 "Scanning",
 418 "Empty",
 419 "Allocating",
 420 "Full",
 421 "Dirty",
 422 "Checkpoint",
 423 "Collecting",
 424 "Dead"
 425 };
 426
 427 static void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
 428 {
 429         int actuallyUsed;
 430         int inUse;
 431
 432         if (yaffs_SkipVerification(dev))
 433                 return;
 434
 435         /* Report illegal runtime states */
 436         if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
 437                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState));
 438
 439         switch (bi->blockState) {
 440         case YAFFS_BLOCK_STATE_UNKNOWN:
 441         case YAFFS_BLOCK_STATE_SCANNING:
 442         case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
 443                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
 444                 n, blockStateName[bi->blockState]));
 445         }
 446
 447         /* Check pages in use and soft deletions are legal */
 448
 449         actuallyUsed = bi->pagesInUse - bi->softDeletions;
 450
 451         if (bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
 452            bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
 453            actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
 454                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
 455                 n, bi->pagesInUse, bi->softDeletions));
 456
 457
 458         /* Check chunk bitmap legal */
 459         inUse = yaffs_CountChunkBits(dev, n);
 460         if (inUse != bi->pagesInUse)
 461                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
 462                         n, bi->pagesInUse, inUse));
 463
 464         /* Check that the sequence number is valid.
 465          * Ten million is legal, but is very unlikely
 466          */
 467         if (dev->isYaffs2 &&
 468            (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
 469            (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000))
 470                 T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has suspect sequence number of %d"TENDSTR),
 471                 n, bi->sequenceNumber));
 472 }
 473
 474 static void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi,
 475                 int n)
 476 {
 477         yaffs_VerifyBlock(dev, bi, n);
 478
 479         /* After collection the block should be in the erased state */
 480         /* This will need to change if we do partial gc */
 481
 482         if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
 483                         bi->blockState != YAFFS_BLOCK_STATE_EMPTY) {
 484                 T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
 485                         n, bi->blockState));
 486         }
 487 }
 488
 489 static void yaffs_VerifyBlocks(yaffs_Device *dev)
 490 {
 491         int i;
 492         int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
 493         int nIllegalBlockStates = 0;
 494
 495         if (yaffs_SkipVerification(dev))
 496                 return;
 497
 498         memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
 499
 500         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
 501                 yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
 502                 yaffs_VerifyBlock(dev, bi, i);
 503
 504                 if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
 505                         nBlocksPerState[bi->blockState]++;
 506                 else
 507                         nIllegalBlockStates++;
 508         }
 509
 510         T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
 511         T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
 512
 513         T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
 514         if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
 515                 T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
 516
 517         for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
 518                 T(YAFFS_TRACE_VERIFY,
 519                   (TSTR("%s %d blocks"TENDSTR),
 520                   blockStateName[i], nBlocksPerState[i]));
 521
 522         if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
 523                 T(YAFFS_TRACE_VERIFY,
 524                  (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
 525                  dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
 526
 527         if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
 528                 T(YAFFS_TRACE_VERIFY,
 529                  (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
 530                  dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
 531
 532         if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
 533                 T(YAFFS_TRACE_VERIFY,
 534                  (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
 535                  nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
 536
 537         T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
 538
 539 }
 540
 541 /*
 542  * Verify the object header. oh must be valid, but obj and tags may be NULL in which
 543  * case those tests will not be performed.
 544  */
 545 static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
 546 {
 547         if (obj && yaffs_SkipVerification(obj->myDev))
 548                 return;
 549
 550         if (!(tags && obj && oh)) {
 551                 T(YAFFS_TRACE_VERIFY,
 552                                 (TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
 553                                 (__u32)tags, (__u32)obj, (__u32)oh));
 554                 return;
 555         }
 556
 557         if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
 558                         oh->type > YAFFS_OBJECT_TYPE_MAX)
 559                 T(YAFFS_TRACE_VERIFY,
 560                         (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
 561                         tags->objectId, oh->type));
 562
 563         if (tags->objectId != obj->objectId)
 564                 T(YAFFS_TRACE_VERIFY,
 565                         (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
 566                         tags->objectId, obj->objectId));
 567
 568
 569         /*
 570          * Check that the object's parent ids match if parentCheck requested.
 571          *
 572          * Tests do not apply to the root object.
 573          */
 574
 575         if (parentCheck && tags->objectId > 1 && !obj->parent)
 576                 T(YAFFS_TRACE_VERIFY,
 577                         (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
 578                         tags->objectId, oh->parentObjectId));
 579
 580         if (parentCheck && obj->parent &&
 581                         oh->parentObjectId != obj->parent->objectId &&
 582                         (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
 583                         obj->parent->objectId != YAFFS_OBJECTID_DELETED))
 584                 T(YAFFS_TRACE_VERIFY,
 585                         (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
 586                         tags->objectId, oh->parentObjectId, obj->parent->objectId));
 587
 588         if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */
 589                 T(YAFFS_TRACE_VERIFY,
 590                         (TSTR("Obj %d header name is NULL"TENDSTR),
 591                         obj->objectId));
 592
 593         if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
 594                 T(YAFFS_TRACE_VERIFY,
 595                         (TSTR("Obj %d header name is 0xFF"TENDSTR),
 596                         obj->objectId));
 597 }
 598
 599
 600
 601 static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
 602                                         __u32 level, int chunkOffset)
 603 {
 604         int i;
 605         yaffs_Device *dev = obj->myDev;
 606         int ok = 1;
 607
 608         if (tn) {
 609                 if (level > 0) {
 610
 611                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
 612                                 if (tn->internal[i]) {
 613                                         ok = yaffs_VerifyTnodeWorker(obj,
 614                                                         tn->internal[i],
 615                                                         level - 1,
 616                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
 617                                 }
 618                         }
 619                 } else if (level == 0) {
 620                         yaffs_ExtendedTags tags;
 621                         __u32 objectId = obj->objectId;
 622
 623                         chunkOffset <<=  YAFFS_TNODES_LEVEL0_BITS;
 624
 625                         for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
 626                                 __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
 627
 628                                 if (theChunk > 0) {
 629                                         /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
 630                                         yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
 631                                         if (tags.objectId != objectId || tags.chunkId != chunkOffset) {
 632                                                 T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
 633                                                         objectId, chunkOffset, theChunk,
 634                                                         tags.objectId, tags.chunkId));
 635                                         }
 636                                 }
 637                                 chunkOffset++;
 638                         }
 639                 }
 640         }
 641
 642         return ok;
 643
 644 }
 645
 646
 647 static void yaffs_VerifyFile(yaffs_Object *obj)
 648 {
 649         int requiredTallness;
 650         int actualTallness;
 651         __u32 lastChunk;
 652         __u32 x;
 653         __u32 i;
 654         yaffs_Device *dev;
 655         yaffs_ExtendedTags tags;
 656         yaffs_Tnode *tn;
 657         __u32 objectId;
 658
 659         if (!obj)
 660                 return;
 661
 662         if (yaffs_SkipVerification(obj->myDev))
 663                 return;
 664
 665         dev = obj->myDev;
 666         objectId = obj->objectId;
 667
 668         /* Check file size is consistent with tnode depth */
 669         lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
 670         x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
 671         requiredTallness = 0;
 672         while (x > 0) {
 673                 x >>= YAFFS_TNODES_INTERNAL_BITS;
 674                 requiredTallness++;
 675         }
 676
 677         actualTallness = obj->variant.fileVariant.topLevel;
 678
 679         if (requiredTallness > actualTallness)
 680                 T(YAFFS_TRACE_VERIFY,
 681                 (TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
 682                  obj->objectId, actualTallness, requiredTallness));
 683
 684
 685         /* Check that the chunks in the tnode tree are all correct.
 686          * We do this by scanning through the tnode tree and
 687          * checking the tags for every chunk match.
 688          */
 689
 690         if (yaffs_SkipNANDVerification(dev))
 691                 return;
 692
 693         for (i = 1; i <= lastChunk; i++) {
 694                 tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i);
 695
 696                 if (tn) {
 697                         __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
 698                         if (theChunk > 0) {
 699                                 /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
 700                                 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
 701                                 if (tags.objectId != objectId || tags.chunkId != i) {
 702                                         T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
 703                                                 objectId, i, theChunk,
 704                                                 tags.objectId, tags.chunkId));
 705                                 }
 706                         }
 707                 }
 708         }
 709 }
 710
 711
 712 static void yaffs_VerifyHardLink(yaffs_Object *obj)
 713 {
 714         if (obj && yaffs_SkipVerification(obj->myDev))
 715                 return;
 716
 717         /* Verify sane equivalent object */
 718 }
 719
 720 static void yaffs_VerifySymlink(yaffs_Object *obj)
 721 {
 722         if (obj && yaffs_SkipVerification(obj->myDev))
 723                 return;
 724
 725         /* Verify symlink string */
 726 }
 727
 728 static void yaffs_VerifySpecial(yaffs_Object *obj)
 729 {
 730         if (obj && yaffs_SkipVerification(obj->myDev))
 731                 return;
 732 }
 733
 734 static void yaffs_VerifyObject(yaffs_Object *obj)
 735 {
 736         yaffs_Device *dev;
 737
 738         __u32 chunkMin;
 739         __u32 chunkMax;
 740
 741         __u32 chunkIdOk;
 742         __u32 chunkInRange;
 743         __u32 chunkShouldNotBeDeleted;
 744         __u32 chunkValid;
 745
 746         if (!obj)
 747                 return;
 748
 749         if (obj->beingCreated)
 750                 return;
 751
 752         dev = obj->myDev;
 753
 754         if (yaffs_SkipVerification(dev))
 755                 return;
 756
 757         /* Check sane object header chunk */
 758
 759         chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
 760         chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
 761
 762         chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
 763         chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
 764         chunkValid = chunkInRange &&
 765                         yaffs_CheckChunkBit(dev,
 766                                         obj->hdrChunk / dev->nChunksPerBlock,
 767                                         obj->hdrChunk % dev->nChunksPerBlock);
 768         chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
 769
 770         if (!obj->fake &&
 771                         (!chunkIdOk || chunkShouldNotBeDeleted)) {
 772                 T(YAFFS_TRACE_VERIFY,
 773                         (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
 774                         obj->objectId, obj->hdrChunk,
 775                         chunkIdOk ? "" : ",out of range",
 776                         chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
 777         }
 778
 779         if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
 780                 yaffs_ExtendedTags tags;
 781                 yaffs_ObjectHeader *oh;
 782                 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
 783
 784                 oh = (yaffs_ObjectHeader *)buffer;
 785
 786                 yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer,
 787                                 &tags);
 788
 789                 yaffs_VerifyObjectHeader(obj, oh, &tags, 1);
 790
 791                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
 792         }
 793
 794         /* Verify it has a parent */
 795         if (obj && !obj->fake &&
 796                         (!obj->parent || obj->parent->myDev != dev)) {
 797                 T(YAFFS_TRACE_VERIFY,
 798                         (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
 799                         obj->objectId, obj->parent));
 800         }
 801
 802         /* Verify parent is a directory */
 803         if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
 804                 T(YAFFS_TRACE_VERIFY,
 805                         (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
 806                         obj->objectId, obj->parent->variantType));
 807         }
 808
 809         switch (obj->variantType) {
 810         case YAFFS_OBJECT_TYPE_FILE:
 811                 yaffs_VerifyFile(obj);
 812                 break;
 813         case YAFFS_OBJECT_TYPE_SYMLINK:
 814                 yaffs_VerifySymlink(obj);
 815                 break;
 816         case YAFFS_OBJECT_TYPE_DIRECTORY:
 817                 yaffs_VerifyDirectory(obj);
 818                 break;
 819         case YAFFS_OBJECT_TYPE_HARDLINK:
 820                 yaffs_VerifyHardLink(obj);
 821                 break;
 822         case YAFFS_OBJECT_TYPE_SPECIAL:
 823                 yaffs_VerifySpecial(obj);
 824                 break;
 825         case YAFFS_OBJECT_TYPE_UNKNOWN:
 826         default:
 827                 T(YAFFS_TRACE_VERIFY,
 828                 (TSTR("Obj %d has illegaltype %d"TENDSTR),
 829                 obj->objectId, obj->variantType));
 830                 break;
 831         }
 832 }
 833
 834 static void yaffs_VerifyObjects(yaffs_Device *dev)
 835 {
 836         yaffs_Object *obj;
 837         int i;
 838         struct ylist_head *lh;
 839
 840         if (yaffs_SkipVerification(dev))
 841                 return;
 842
 843         /* Iterate through the objects in each hash entry */
 844
 845         for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
 846                 ylist_for_each(lh, &dev->objectBucket[i].list) {
 847                         if (lh) {
 848                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
 849                                 yaffs_VerifyObject(obj);
 850                         }
 851                 }
 852         }
 853 }
 854
 855
 856 /*
 857  *  Simple hash function. Needs to have a reasonable spread
 858  */
 859
 860 static Y_INLINE int yaffs_HashFunction(int n)
 861 {
 862         n = abs(n);
 863         return n % YAFFS_NOBJECT_BUCKETS;
 864 }
 865
 866 /*
 867  * Access functions to useful fake objects.
 868  * Note that root might have a presence in NAND if permissions are set.
 869  */
 870
 871 yaffs_Object *yaffs_Root(yaffs_Device *dev)
 872 {
 873         return dev->rootDir;
 874 }
 875
 876 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
 877 {
 878         return dev->lostNFoundDir;
 879 }
 880
 881
 882 /*
 883  *  Erased NAND checking functions
 884  */
 885
 886 int yaffs_CheckFF(__u8 *buffer, int nBytes)
 887 {
 888         /* Horrible, slow implementation */
 889         while (nBytes--) {
 890                 if (*buffer != 0xFF)
 891                         return 0;
 892                 buffer++;
 893         }
 894         return 1;
 895 }
 896
 897 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
 898                                 int chunkInNAND)
 899 {
 900         int retval = YAFFS_OK;
 901         __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
 902         yaffs_ExtendedTags tags;
 903         int result;
 904
 905         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
 906
 907         if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
 908                 retval = YAFFS_FAIL;
 909
 910         if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
 911                 T(YAFFS_TRACE_NANDACCESS,
 912                   (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
 913                 retval = YAFFS_FAIL;
 914         }
 915
 916         yaffs_ReleaseTempBuffer(dev, data, __LINE__);
 917
 918         return retval;
 919
 920 }
 921
 922 static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
 923                                         const __u8 *data,
 924                                         yaffs_ExtendedTags *tags,
 925                                         int useReserve)
 926 {
 927         int attempts = 0;
 928         int writeOk = 0;
 929         int chunk;
 930
 931         yaffs_InvalidateCheckpoint(dev);
 932
 933         do {
 934                 yaffs_BlockInfo *bi = 0;
 935                 int erasedOk = 0;
 936
 937                 chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
 938                 if (chunk < 0) {
 939                         /* no space */
 940                         break;
 941                 }
 942
 943                 /* First check this chunk is erased, if it needs
 944                  * checking.  The checking policy (unless forced
 945                  * always on) is as follows:
 946                  *
 947                  * Check the first page we try to write in a block.
 948                  * If the check passes then we don't need to check any
 949                  * more.        If the check fails, we check again...
 950                  * If the block has been erased, we don't need to check.
 951                  *
 952                  * However, if the block has been prioritised for gc,
 953                  * then we think there might be something odd about
 954                  * this block and stop using it.
 955                  *
 956                  * Rationale: We should only ever see chunks that have
 957                  * not been erased if there was a partially written
 958                  * chunk due to power loss.  This checking policy should
 959                  * catch that case with very few checks and thus save a
 960                  * lot of checks that are most likely not needed.
 961                  */
 962                 if (bi->gcPrioritise) {
 963                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
 964                         /* try another chunk */
 965                         continue;
 966                 }
 967
 968                 /* let's give it a try */
 969                 attempts++;
 970
 971 #ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
 972                 bi->skipErasedCheck = 0;
 973 #endif
 974                 if (!bi->skipErasedCheck) {
 975                         erasedOk = yaffs_CheckChunkErased(dev, chunk);
 976                         if (erasedOk != YAFFS_OK) {
 977                                 T(YAFFS_TRACE_ERROR,
 978                                 (TSTR("**>> yaffs chunk %d was not erased"
 979                                 TENDSTR), chunk));
 980
 981                                 /* try another chunk */
 982                                 continue;
 983                         }
 984                         bi->skipErasedCheck = 1;
 985                 }
 986
 987                 writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
 988                                 data, tags);
 989                 if (writeOk != YAFFS_OK) {
 990                         yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
 991                         /* try another chunk */
 992                         continue;
 993                 }
 994
 995                 /* Copy the data into the robustification buffer */
 996                 yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
 997
 998         } while (writeOk != YAFFS_OK &&
 999                 (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
1000
1001         if (!writeOk)
1002                 chunk = -1;
1003
1004         if (attempts > 1) {
1005                 T(YAFFS_TRACE_ERROR,
1006                         (TSTR("**>> yaffs write required %d attempts" TENDSTR),
1007                         attempts));
1008
1009                 dev->nRetriedWrites += (attempts - 1);
1010         }
1011
1012         return chunk;
1013 }
1014
1015 /*
1016  * Block retiring for handling a broken block.
1017  */
1018
1019 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
1020 {
1021         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1022
1023         yaffs_InvalidateCheckpoint(dev);
1024
1025         if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
1026                 if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
1027                         T(YAFFS_TRACE_ALWAYS, (TSTR(
1028                                 "yaffs: Failed to mark bad and erase block %d"
1029                                 TENDSTR), blockInNAND));
1030                 } else {
1031                         yaffs_ExtendedTags tags;
1032                         int chunkId = blockInNAND * dev->nChunksPerBlock;
1033
1034                         __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
1035
1036                         memset(buffer, 0xff, dev->nDataBytesPerChunk);
1037                         yaffs_InitialiseTags(&tags);
1038                         tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
1039                         if (dev->writeChunkWithTagsToNAND(dev, chunkId -
1040                                 dev->chunkOffset, buffer, &tags) != YAFFS_OK)
1041                                 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
1042                                         TCONT("write bad block marker to block %d")
1043                                         TENDSTR), blockInNAND));
1044
1045                         yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
1046                 }
1047         }
1048
1049         bi->blockState = YAFFS_BLOCK_STATE_DEAD;
1050         bi->gcPrioritise = 0;
1051         bi->needsRetiring = 0;
1052
1053         dev->nRetiredBlocks++;
1054 }
1055
1056 /*
1057  * Functions for robustisizing TODO
1058  *
1059  */
1060
1061 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
1062                                 const __u8 *data,
1063                                 const yaffs_ExtendedTags *tags)
1064 {
1065 }
1066
1067 static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
1068                                 const yaffs_ExtendedTags *tags)
1069 {
1070 }
1071
1072 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
1073 {
1074         if (!bi->gcPrioritise) {
1075                 bi->gcPrioritise = 1;
1076                 dev->hasPendingPrioritisedGCs = 1;
1077                 bi->chunkErrorStrikes++;
1078
1079                 if (bi->chunkErrorStrikes > 3) {
1080                         bi->needsRetiring = 1; /* Too many stikes, so retire this */
1081                         T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
1082
1083                 }
1084         }
1085 }
1086
1087 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
1088                 int erasedOk)
1089 {
1090         int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
1091         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
1092
1093         yaffs_HandleChunkError(dev, bi);
1094
1095         if (erasedOk) {
1096                 /* Was an actual write failure, so mark the block for retirement  */
1097                 bi->needsRetiring = 1;
1098                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
1099                   (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
1100         }
1101
1102         /* Delete the chunk */
1103         yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
1104 }
1105
1106
1107 /*---------------- Name handling functions ------------*/
1108
1109 static __u16 yaffs_CalcNameSum(const YCHAR *name)
1110 {
1111         __u16 sum = 0;
1112         __u16 i = 1;
1113
1114         const YUCHAR *bname = (const YUCHAR *) name;
1115         if (bname) {
1116                 while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
1117
1118 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1119                         sum += yaffs_toupper(*bname) * i;
1120 #else
1121                         sum += (*bname) * i;
1122 #endif
1123                         i++;
1124                         bname++;
1125                 }
1126         }
1127         return sum;
1128 }
1129
1130 static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
1131 {
1132 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
1133         memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
1134         if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH)
1135                 yaffs_strcpy(obj->shortName, name);
1136         else
1137                 obj->shortName[0] = _Y('\0');
1138 #endif
1139         obj->sum = yaffs_CalcNameSum(name);
1140 }
1141
1142 /*-------------------- TNODES -------------------
1143
1144  * List of spare tnodes
1145  * The list is hooked together using the first pointer
1146  * in the tnode.
1147  */
1148
1149 /* yaffs_CreateTnodes creates a bunch more tnodes and
1150  * adds them to the tnode free list.
1151  * Don't use this function directly
1152  */
1153
1154 static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
1155 {
1156         int i;
1157         int tnodeSize;
1158         yaffs_Tnode *newTnodes;
1159         __u8 *mem;
1160         yaffs_Tnode *curr;
1161         yaffs_Tnode *next;
1162         yaffs_TnodeList *tnl;
1163
1164         if (nTnodes < 1)
1165                 return YAFFS_OK;
1166
1167         /* Calculate the tnode size in bytes for variable width tnode support.
1168          * Must be a multiple of 32-bits  */
1169         tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1170
1171         if (tnodeSize < sizeof(yaffs_Tnode))
1172                 tnodeSize = sizeof(yaffs_Tnode);
1173
1174         /* make these things */
1175
1176         newTnodes = YMALLOC(nTnodes * tnodeSize);
1177         mem = (__u8 *)newTnodes;
1178
1179         if (!newTnodes) {
1180                 T(YAFFS_TRACE_ERROR,
1181                         (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
1182                 return YAFFS_FAIL;
1183         }
1184
1185         /* Hook them into the free list */
1186 #if 0
1187         for (i = 0; i < nTnodes - 1; i++) {
1188                 newTnodes[i].internal[0] = &newTnodes[i + 1];
1189 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1190                 newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1191 #endif
1192         }
1193
1194         newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
1195 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1196         newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1197 #endif
1198         dev->freeTnodes = newTnodes;
1199 #else
1200         /* New hookup for wide tnodes */
1201         for (i = 0; i < nTnodes - 1; i++) {
1202                 curr = (yaffs_Tnode *) &mem[i * tnodeSize];
1203                 next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
1204                 curr->internal[0] = next;
1205         }
1206
1207         curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
1208         curr->internal[0] = dev->freeTnodes;
1209         dev->freeTnodes = (yaffs_Tnode *)mem;
1210
1211 #endif
1212
1213
1214         dev->nFreeTnodes += nTnodes;
1215         dev->nTnodesCreated += nTnodes;
1216
1217         /* Now add this bunch of tnodes to a list for freeing up.
1218          * NB If we can't add this to the management list it isn't fatal
1219          * but it just means we can't free this bunch of tnodes later.
1220          */
1221
1222         tnl = YMALLOC(sizeof(yaffs_TnodeList));
1223         if (!tnl) {
1224                 T(YAFFS_TRACE_ERROR,
1225                   (TSTR
1226                    ("yaffs: Could not add tnodes to management list" TENDSTR)));
1227                    return YAFFS_FAIL;
1228         } else {
1229                 tnl->tnodes = newTnodes;
1230                 tnl->next = dev->allocatedTnodeList;
1231                 dev->allocatedTnodeList = tnl;
1232         }
1233
1234         T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
1235
1236         return YAFFS_OK;
1237 }
1238
1239 /* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
1240
1241 static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device *dev)
1242 {
1243         yaffs_Tnode *tn = NULL;
1244
1245         /* If there are none left make more */
1246         if (!dev->freeTnodes)
1247                 yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
1248
1249         if (dev->freeTnodes) {
1250                 tn = dev->freeTnodes;
1251 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1252                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
1253                         /* Hoosterman, this thing looks like it isn't in the list */
1254                         T(YAFFS_TRACE_ALWAYS,
1255                           (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
1256                 }
1257 #endif
1258                 dev->freeTnodes = dev->freeTnodes->internal[0];
1259                 dev->nFreeTnodes--;
1260         }
1261
1262         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1263
1264         return tn;
1265 }
1266
1267 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
1268 {
1269         yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
1270         int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
1271
1272         if (tnodeSize < sizeof(yaffs_Tnode))
1273                 tnodeSize = sizeof(yaffs_Tnode);
1274
1275         if (tn)
1276                 memset(tn, 0, tnodeSize);
1277
1278         return tn;
1279 }
1280
1281 /* FreeTnode frees up a tnode and puts it back on the free list */
1282 static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
1283 {
1284         if (tn) {
1285 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
1286                 if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
1287                         /* Hoosterman, this thing looks like it is already in the list */
1288                         T(YAFFS_TRACE_ALWAYS,
1289                           (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
1290                 }
1291                 tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
1292 #endif
1293                 tn->internal[0] = dev->freeTnodes;
1294                 dev->freeTnodes = tn;
1295                 dev->nFreeTnodes++;
1296         }
1297         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1298 }
1299
1300 static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
1301 {
1302         /* Free the list of allocated tnodes */
1303         yaffs_TnodeList *tmp;
1304
1305         while (dev->allocatedTnodeList) {
1306                 tmp = dev->allocatedTnodeList->next;
1307
1308                 YFREE(dev->allocatedTnodeList->tnodes);
1309                 YFREE(dev->allocatedTnodeList);
1310                 dev->allocatedTnodeList = tmp;
1311
1312         }
1313
1314         dev->freeTnodes = NULL;
1315         dev->nFreeTnodes = 0;
1316 }
1317
1318 static void yaffs_InitialiseTnodes(yaffs_Device *dev)
1319 {
1320         dev->allocatedTnodeList = NULL;
1321         dev->freeTnodes = NULL;
1322         dev->nFreeTnodes = 0;
1323         dev->nTnodesCreated = 0;
1324 }
1325
1326
1327 void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
1328                 unsigned val)
1329 {
1330         __u32 *map = (__u32 *)tn;
1331         __u32 bitInMap;
1332         __u32 bitInWord;
1333         __u32 wordInMap;
1334         __u32 mask;
1335
1336         pos &= YAFFS_TNODES_LEVEL0_MASK;
1337         val >>= dev->chunkGroupBits;
1338
1339         bitInMap = pos * dev->tnodeWidth;
1340         wordInMap = bitInMap / 32;
1341         bitInWord = bitInMap & (32 - 1);
1342
1343         mask = dev->tnodeMask << bitInWord;
1344
1345         map[wordInMap] &= ~mask;
1346         map[wordInMap] |= (mask & (val << bitInWord));
1347
1348         if (dev->tnodeWidth > (32 - bitInWord)) {
1349                 bitInWord = (32 - bitInWord);
1350                 wordInMap++;;
1351                 mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
1352                 map[wordInMap] &= ~mask;
1353                 map[wordInMap] |= (mask & (val >> bitInWord));
1354         }
1355 }
1356
1357 static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
1358                 unsigned pos)
1359 {
1360         __u32 *map = (__u32 *)tn;
1361         __u32 bitInMap;
1362         __u32 bitInWord;
1363         __u32 wordInMap;
1364         __u32 val;
1365
1366         pos &= YAFFS_TNODES_LEVEL0_MASK;
1367
1368         bitInMap = pos * dev->tnodeWidth;
1369         wordInMap = bitInMap / 32;
1370         bitInWord = bitInMap & (32 - 1);
1371
1372         val = map[wordInMap] >> bitInWord;
1373
1374         if      (dev->tnodeWidth > (32 - bitInWord)) {
1375                 bitInWord = (32 - bitInWord);
1376                 wordInMap++;;
1377                 val |= (map[wordInMap] << bitInWord);
1378         }
1379
1380         val &= dev->tnodeMask;
1381         val <<= dev->chunkGroupBits;
1382
1383         return val;
1384 }
1385
1386 /* ------------------- End of individual tnode manipulation -----------------*/
1387
1388 /* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
1389  * The look up tree is represented by the top tnode and the number of topLevel
1390  * in the tree. 0 means only the level 0 tnode is in the tree.
1391  */
1392
1393 /* FindLevel0Tnode finds the level 0 tnode, if one exists. */
1394 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
1395                                         yaffs_FileStructure *fStruct,
1396                                         __u32 chunkId)
1397 {
1398         yaffs_Tnode *tn = fStruct->top;
1399         __u32 i;
1400         int requiredTallness;
1401         int level = fStruct->topLevel;
1402
1403         /* Check sane level and chunk Id */
1404         if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
1405                 return NULL;
1406
1407         if (chunkId > YAFFS_MAX_CHUNK_ID)
1408                 return NULL;
1409
1410         /* First check we're tall enough (ie enough topLevel) */
1411
1412         i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1413         requiredTallness = 0;
1414         while (i) {
1415                 i >>= YAFFS_TNODES_INTERNAL_BITS;
1416                 requiredTallness++;
1417         }
1418
1419         if (requiredTallness > fStruct->topLevel)
1420                 return NULL; /* Not tall enough, so we can't find it */
1421
1422         /* Traverse down to level 0 */
1423         while (level > 0 && tn) {
1424                 tn = tn->internal[(chunkId >>
1425                         (YAFFS_TNODES_LEVEL0_BITS +
1426                                 (level - 1) *
1427                                 YAFFS_TNODES_INTERNAL_BITS)) &
1428                         YAFFS_TNODES_INTERNAL_MASK];
1429                 level--;
1430         }
1431
1432         return tn;
1433 }
1434
1435 /* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
1436  * This happens in two steps:
1437  *  1. If the tree isn't tall enough, then make it taller.
1438  *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
1439  *
1440  * Used when modifying the tree.
1441  *
1442  *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
1443  *  be plugged into the ttree.
1444  */
1445
1446 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
1447                                         yaffs_FileStructure *fStruct,
1448                                         __u32 chunkId,
1449                                         yaffs_Tnode *passedTn)
1450 {
1451         int requiredTallness;
1452         int i;
1453         int l;
1454         yaffs_Tnode *tn;
1455
1456         __u32 x;
1457
1458
1459         /* Check sane level and page Id */
1460         if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
1461                 return NULL;
1462
1463         if (chunkId > YAFFS_MAX_CHUNK_ID)
1464                 return NULL;
1465
1466         /* First check we're tall enough (ie enough topLevel) */
1467
1468         x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
1469         requiredTallness = 0;
1470         while (x) {
1471                 x >>= YAFFS_TNODES_INTERNAL_BITS;
1472                 requiredTallness++;
1473         }
1474
1475
1476         if (requiredTallness > fStruct->topLevel) {
1477                 /* Not tall enough, gotta make the tree taller */
1478                 for (i = fStruct->topLevel; i < requiredTallness; i++) {
1479
1480                         tn = yaffs_GetTnode(dev);
1481
1482                         if (tn) {
1483                                 tn->internal[0] = fStruct->top;
1484                                 fStruct->top = tn;
1485                         } else {
1486                                 T(YAFFS_TRACE_ERROR,
1487                                   (TSTR("yaffs: no more tnodes" TENDSTR)));
1488                         }
1489                 }
1490
1491                 fStruct->topLevel = requiredTallness;
1492         }
1493
1494         /* Traverse down to level 0, adding anything we need */
1495
1496         l = fStruct->topLevel;
1497         tn = fStruct->top;
1498
1499         if (l > 0) {
1500                 while (l > 0 && tn) {
1501                         x = (chunkId >>
1502                              (YAFFS_TNODES_LEVEL0_BITS +
1503                               (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
1504                             YAFFS_TNODES_INTERNAL_MASK;
1505
1506
1507                         if ((l > 1) && !tn->internal[x]) {
1508                                 /* Add missing non-level-zero tnode */
1509                                 tn->internal[x] = yaffs_GetTnode(dev);
1510
1511                         } else if (l == 1) {
1512                                 /* Looking from level 1 at level 0 */
1513                                 if (passedTn) {
1514                                         /* If we already have one, then release it.*/
1515                                         if (tn->internal[x])
1516                                                 yaffs_FreeTnode(dev, tn->internal[x]);
1517                                         tn->internal[x] = passedTn;
1518
1519                                 } else if (!tn->internal[x]) {
1520                                         /* Don't have one, none passed in */
1521                                         tn->internal[x] = yaffs_GetTnode(dev);
1522                                 }
1523                         }
1524
1525                         tn = tn->internal[x];
1526                         l--;
1527                 }
1528         } else {
1529                 /* top is level 0 */
1530                 if (passedTn) {
1531                         memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
1532                         yaffs_FreeTnode(dev, passedTn);
1533                 }
1534         }
1535
1536         return tn;
1537 }
1538
1539 static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
1540                                 yaffs_ExtendedTags *tags, int objectId,
1541                                 int chunkInInode)
1542 {
1543         int j;
1544
1545         for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
1546                 if (yaffs_CheckChunkBit(dev, theChunk / dev->nChunksPerBlock,
1547                                 theChunk % dev->nChunksPerBlock)) {
1548
1549                         if(dev->chunkGroupSize == 1)
1550                                 return theChunk;
1551                         else {
1552                                 yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
1553                                                                 tags);
1554                                 if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
1555                                         /* found it; */
1556                                         return theChunk;
1557                                 }
1558                         }
1559                 }
1560                 theChunk++;
1561         }
1562         return -1;
1563 }
1564
1565
1566 /* DeleteWorker scans backwards through the tnode tree and deletes all the
1567  * chunks and tnodes in the file
1568  * Returns 1 if the tree was deleted.
1569  * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1570  */
1571
1572 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
1573                               int chunkOffset, int *limit)
1574 {
1575         int i;
1576         int chunkInInode;
1577         int theChunk;
1578         yaffs_ExtendedTags tags;
1579         int foundChunk;
1580         yaffs_Device *dev = in->myDev;
1581
1582         int allDone = 1;
1583
1584         if (tn) {
1585                 if (level > 0) {
1586                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1587                              i--) {
1588                                 if (tn->internal[i]) {
1589                                         if (limit && (*limit) < 0) {
1590                                                 allDone = 0;
1591                                         } else {
1592                                                 allDone =
1593                                                         yaffs_DeleteWorker(in,
1594                                                                 tn->
1595                                                                 internal
1596                                                                 [i],
1597                                                                 level -
1598                                                                 1,
1599                                                                 (chunkOffset
1600                                                                         <<
1601                                                                         YAFFS_TNODES_INTERNAL_BITS)
1602                                                                 + i,
1603                                                                 limit);
1604                                         }
1605                                         if (allDone) {
1606                                                 yaffs_FreeTnode(dev,
1607                                                                 tn->
1608                                                                 internal[i]);
1609                                                 tn->internal[i] = NULL;
1610                                         }
1611                                 }
1612                         }
1613                         return (allDone) ? 1 : 0;
1614                 } else if (level == 0) {
1615                         int hitLimit = 0;
1616
1617                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
1618                                         i--) {
1619                                 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1620                                 if (theChunk) {
1621
1622                                         chunkInInode = (chunkOffset <<
1623                                                 YAFFS_TNODES_LEVEL0_BITS) + i;
1624
1625                                         foundChunk =
1626                                                 yaffs_FindChunkInGroup(dev,
1627                                                                 theChunk,
1628                                                                 &tags,
1629                                                                 in->objectId,
1630                                                                 chunkInInode);
1631
1632                                         if (foundChunk > 0) {
1633                                                 yaffs_DeleteChunk(dev,
1634                                                                   foundChunk, 1,
1635                                                                   __LINE__);
1636                                                 in->nDataChunks--;
1637                                                 if (limit) {
1638                                                         *limit = *limit - 1;
1639                                                         if (*limit <= 0)
1640                                                                 hitLimit = 1;
1641                                                 }
1642
1643                                         }
1644
1645                                         yaffs_PutLevel0Tnode(dev, tn, i, 0);
1646                                 }
1647
1648                         }
1649                         return (i < 0) ? 1 : 0;
1650
1651                 }
1652
1653         }
1654
1655         return 1;
1656
1657 }
1658
1659 static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
1660 {
1661         yaffs_BlockInfo *theBlock;
1662
1663         T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
1664
1665         theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
1666         if (theBlock) {
1667                 theBlock->softDeletions++;
1668                 dev->nFreeChunks++;
1669         }
1670 }
1671
1672 /* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1673  * All soft deleting does is increment the block's softdelete count and pulls the chunk out
1674  * of the tnode.
1675  * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1676  */
1677
1678 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
1679                                   __u32 level, int chunkOffset)
1680 {
1681         int i;
1682         int theChunk;
1683         int allDone = 1;
1684         yaffs_Device *dev = in->myDev;
1685
1686         if (tn) {
1687                 if (level > 0) {
1688
1689                         for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
1690                              i--) {
1691                                 if (tn->internal[i]) {
1692                                         allDone =
1693                                             yaffs_SoftDeleteWorker(in,
1694                                                                    tn->
1695                                                                    internal[i],
1696                                                                    level - 1,
1697                                                                    (chunkOffset
1698                                                                     <<
1699                                                                     YAFFS_TNODES_INTERNAL_BITS)
1700                                                                    + i);
1701                                         if (allDone) {
1702                                                 yaffs_FreeTnode(dev,
1703                                                                 tn->
1704                                                                 internal[i]);
1705                                                 tn->internal[i] = NULL;
1706                                         } else {
1707                                                 /* Hoosterman... how could this happen? */
1708                                         }
1709                                 }
1710                         }
1711                         return (allDone) ? 1 : 0;
1712                 } else if (level == 0) {
1713
1714                         for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
1715                                 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
1716                                 if (theChunk) {
1717                                         /* Note this does not find the real chunk, only the chunk group.
1718                                          * We make an assumption that a chunk group is not larger than
1719                                          * a block.
1720                                          */
1721                                         yaffs_SoftDeleteChunk(dev, theChunk);
1722                                         yaffs_PutLevel0Tnode(dev, tn, i, 0);
1723                                 }
1724
1725                         }
1726                         return 1;
1727
1728                 }
1729
1730         }
1731
1732         return 1;
1733
1734 }
1735
1736 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1737 {
1738         if (obj->deleted &&
1739             obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
1740                 if (obj->nDataChunks <= 0) {
1741                         /* Empty file with no duplicate object headers, just delete it immediately */
1742                         yaffs_FreeTnode(obj->myDev,
1743                                         obj->variant.fileVariant.top);
1744                         obj->variant.fileVariant.top = NULL;
1745                         T(YAFFS_TRACE_TRACING,
1746                           (TSTR("yaffs: Deleting empty file %d" TENDSTR),
1747                            obj->objectId));
1748                         yaffs_DoGenericObjectDeletion(obj);
1749                 } else {
1750                         yaffs_SoftDeleteWorker(obj,
1751                                                obj->variant.fileVariant.top,
1752                                                obj->variant.fileVariant.
1753                                                topLevel, 0);
1754                         obj->softDeleted = 1;
1755                 }
1756         }
1757 }
1758
1759 /* Pruning removes any part of the file structure tree that is beyond the
1760  * bounds of the file (ie that does not point to chunks).
1761  *
1762  * A file should only get pruned when its size is reduced.
1763  *
1764  * Before pruning, the chunks must be pulled from the tree and the
1765  * level 0 tnode entries must be zeroed out.
1766  * Could also use this for file deletion, but that's probably better handled
1767  * by a special case.
1768  */
1769
1770 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
1771                                 __u32 level, int del0)
1772 {
1773         int i;
1774         int hasData;
1775
1776         if (tn) {
1777                 hasData = 0;
1778
1779                 for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
1780                         if (tn->internal[i] && level > 0) {
1781                                 tn->internal[i] =
1782                                     yaffs_PruneWorker(dev, tn->internal[i],
1783                                                       level - 1,
1784                                                       (i == 0) ? del0 : 1);
1785                         }
1786
1787                         if (tn->internal[i])
1788                                 hasData++;
1789                 }
1790
1791                 if (hasData == 0 && del0) {
1792                         /* Free and return NULL */
1793
1794                         yaffs_FreeTnode(dev, tn);
1795                         tn = NULL;
1796                 }
1797
1798         }
1799
1800         return tn;
1801
1802 }
1803
1804 static int yaffs_PruneFileStructure(yaffs_Device *dev,
1805                                 yaffs_FileStructure *fStruct)
1806 {
1807         int i;
1808         int hasData;
1809         int done = 0;
1810         yaffs_Tnode *tn;
1811
1812         if (fStruct->topLevel > 0) {
1813                 fStruct->top =
1814                     yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
1815
1816                 /* Now we have a tree with all the non-zero branches NULL but the height
1817                  * is the same as it was.
1818                  * Let's see if we can trim internal tnodes to shorten the tree.
1819                  * We can do this if only the 0th element in the tnode is in use
1820                  * (ie all the non-zero are NULL)
1821                  */
1822
1823                 while (fStruct->topLevel && !done) {
1824                         tn = fStruct->top;
1825
1826                         hasData = 0;
1827                         for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
1828                                 if (tn->internal[i])
1829                                         hasData++;
1830                         }
1831
1832                         if (!hasData) {
1833                                 fStruct->top = tn->internal[0];
1834                                 fStruct->topLevel--;
1835                                 yaffs_FreeTnode(dev, tn);
1836                         } else {
1837                                 done = 1;
1838                         }
1839                 }
1840         }
1841
1842         return YAFFS_OK;
1843 }
1844
1845 /*-------------------- End of File Structure functions.-------------------*/
1846
1847 /* yaffs_CreateFreeObjects creates a bunch more objects and
1848  * adds them to the object free list.
1849  */
1850 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
1851 {
1852         int i;
1853         yaffs_Object *newObjects;
1854         yaffs_ObjectList *list;
1855
1856         if (nObjects < 1)
1857                 return YAFFS_OK;
1858
1859         /* make these things */
1860         newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1861         list = YMALLOC(sizeof(yaffs_ObjectList));
1862
1863         if (!newObjects || !list) {
1864                 if (newObjects)
1865                         YFREE(newObjects);
1866                 if (list)
1867                         YFREE(list);
1868                 T(YAFFS_TRACE_ALLOCATE,
1869                   (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1870                 return YAFFS_FAIL;
1871         }
1872
1873         /* Hook them into the free list */
1874         for (i = 0; i < nObjects - 1; i++) {
1875                 newObjects[i].siblings.next =
1876                                 (struct ylist_head *)(&newObjects[i + 1]);
1877         }
1878
1879         newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1880         dev->freeObjects = newObjects;
1881         dev->nFreeObjects += nObjects;
1882         dev->nObjectsCreated += nObjects;
1883
1884         /* Now add this bunch of Objects to a list for freeing up. */
1885
1886         list->objects = newObjects;
1887         list->next = dev->allocatedObjectList;
1888         dev->allocatedObjectList = list;
1889
1890         return YAFFS_OK;
1891 }
1892
1893
1894 /* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
1895 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
1896 {
1897         yaffs_Object *tn = NULL;
1898
1899 #ifdef VALGRIND_TEST
1900         tn = YMALLOC(sizeof(yaffs_Object));
1901 #else
1902         /* If there are none left make more */
1903         if (!dev->freeObjects)
1904                 yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
1905
1906         if (dev->freeObjects) {
1907                 tn = dev->freeObjects;
1908                 dev->freeObjects =
1909                         (yaffs_Object *) (dev->freeObjects->siblings.next);
1910                 dev->nFreeObjects--;
1911         }
1912 #endif
1913         if (tn) {
1914                 /* Now sweeten it up... */
1915
1916                 memset(tn, 0, sizeof(yaffs_Object));
1917                 tn->beingCreated = 1;
1918
1919                 tn->myDev = dev;
1920                 tn->hdrChunk = 0;
1921                 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1922                 YINIT_LIST_HEAD(&(tn->hardLinks));
1923                 YINIT_LIST_HEAD(&(tn->hashLink));
1924                 YINIT_LIST_HEAD(&tn->siblings);
1925
1926
1927                 /* Now make the directory sane */
1928                 if (dev->rootDir) {
1929                         tn->parent = dev->rootDir;
1930                         ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
1931                 }
1932
1933                 /* Add it to the lost and found directory.
1934                  * NB Can't put root or lostNFound in lostNFound so
1935                  * check if lostNFound exists first
1936                  */
1937                 if (dev->lostNFoundDir)
1938                         yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
1939
1940                 tn->beingCreated = 0;
1941         }
1942
1943         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
1944
1945         return tn;
1946 }
1947
1948 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
1949                                                __u32 mode)
1950 {
1951
1952         yaffs_Object *obj =
1953             yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
1954         if (obj) {
1955                 obj->fake = 1;          /* it is fake so it might have no NAND presence... */
1956                 obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
1957                 obj->unlinkAllowed = 0; /* ... or unlink it */
1958                 obj->deleted = 0;
1959                 obj->unlinked = 0;
1960                 obj->yst_mode = mode;
1961                 obj->myDev = dev;
1962                 obj->hdrChunk = 0;      /* Not a valid chunk. */
1963         }
1964
1965         return obj;
1966
1967 }
1968
1969 static void yaffs_UnhashObject(yaffs_Object *tn)
1970 {
1971         int bucket;
1972         yaffs_Device *dev = tn->myDev;
1973
1974         /* If it is still linked into the bucket list, free from the list */
1975         if (!ylist_empty(&tn->hashLink)) {
1976                 ylist_del_init(&tn->hashLink);
1977                 bucket = yaffs_HashFunction(tn->objectId);
1978                 dev->objectBucket[bucket].count--;
1979         }
1980 }
1981
1982 /*  FreeObject frees up a Object and puts it back on the free list */
1983 static void yaffs_FreeObject(yaffs_Object *tn)
1984 {
1985         yaffs_Device *dev = tn->myDev;
1986
1987 #ifdef __KERNEL__
1988         T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
1989 #endif
1990
1991         if (tn->parent)
1992                 YBUG();
1993         if (!ylist_empty(&tn->siblings))
1994                 YBUG();
1995
1996
1997 #ifdef __KERNEL__
1998         if (tn->myInode) {
1999                 /* We're still hooked up to a cached inode.
2000                  * Don't delete now, but mark for later deletion
2001                  */
2002                 tn->deferedFree = 1;
2003                 return;
2004         }
2005 #endif
2006
2007         yaffs_UnhashObject(tn);
2008
2009 #ifdef VALGRIND_TEST
2010         YFREE(tn);
2011 #else
2012         /* Link into the free list. */
2013         tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
2014         dev->freeObjects = tn;
2015         dev->nFreeObjects++;
2016 #endif
2017         dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
2018 }
2019
2020 #ifdef __KERNEL__
2021
2022 void yaffs_HandleDeferedFree(yaffs_Object *obj)
2023 {
2024         if (obj->deferedFree)
2025                 yaffs_FreeObject(obj);
2026 }
2027
2028 #endif
2029
2030 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
2031 {
2032         /* Free the list of allocated Objects */
2033
2034         yaffs_ObjectList *tmp;
2035
2036         while (dev->allocatedObjectList) {
2037                 tmp = dev->allocatedObjectList->next;
2038                 YFREE(dev->allocatedObjectList->objects);
2039                 YFREE(dev->allocatedObjectList);
2040
2041                 dev->allocatedObjectList = tmp;
2042         }
2043
2044         dev->freeObjects = NULL;
2045         dev->nFreeObjects = 0;
2046 }
2047
2048 static void yaffs_InitialiseObjects(yaffs_Device *dev)
2049 {
2050         int i;
2051
2052         dev->allocatedObjectList = NULL;
2053         dev->freeObjects = NULL;
2054         dev->nFreeObjects = 0;
2055
2056         for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
2057                 YINIT_LIST_HEAD(&dev->objectBucket[i].list);
2058                 dev->objectBucket[i].count = 0;
2059         }
2060 }
2061
2062 static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
2063 {
2064         static int x;
2065         int i;
2066         int l = 999;
2067         int lowest = 999999;
2068
2069         /* First let's see if we can find one that's empty. */
2070
2071         for (i = 0; i < 10 && lowest > 0; i++) {
2072                 x++;
2073                 x %= YAFFS_NOBJECT_BUCKETS;
2074                 if (dev->objectBucket[x].count < lowest) {
2075                         lowest = dev->objectBucket[x].count;
2076                         l = x;
2077                 }
2078
2079         }
2080
2081         /* If we didn't find an empty list, then try
2082          * looking a bit further for a short one
2083          */
2084
2085         for (i = 0; i < 10 && lowest > 3; i++) {
2086                 x++;
2087                 x %= YAFFS_NOBJECT_BUCKETS;
2088                 if (dev->objectBucket[x].count < lowest) {
2089                         lowest = dev->objectBucket[x].count;
2090                         l = x;
2091                 }
2092
2093         }
2094
2095         return l;
2096 }
2097
2098 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
2099 {
2100         int bucket = yaffs_FindNiceObjectBucket(dev);
2101
2102         /* Now find an object value that has not already been taken
2103          * by scanning the list.
2104          */
2105
2106         int found = 0;
2107         struct ylist_head *i;
2108
2109         __u32 n = (__u32) bucket;
2110
2111         /* yaffs_CheckObjectHashSanity();  */
2112
2113         while (!found) {
2114                 found = 1;
2115                 n += YAFFS_NOBJECT_BUCKETS;
2116                 if (1 || dev->objectBucket[bucket].count > 0) {
2117                         ylist_for_each(i, &dev->objectBucket[bucket].list) {
2118                                 /* If there is already one in the list */
2119                                 if (i && ylist_entry(i, yaffs_Object,
2120                                                 hashLink)->objectId == n) {
2121                                         found = 0;
2122                                 }
2123                         }
2124                 }
2125         }
2126
2127         return n;
2128 }
2129
2130 static void yaffs_HashObject(yaffs_Object *in)
2131 {
2132         int bucket = yaffs_HashFunction(in->objectId);
2133         yaffs_Device *dev = in->myDev;
2134
2135         ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
2136         dev->objectBucket[bucket].count++;
2137 }
2138
2139 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
2140 {
2141         int bucket = yaffs_HashFunction(number);
2142         struct ylist_head *i;
2143         yaffs_Object *in;
2144
2145         ylist_for_each(i, &dev->objectBucket[bucket].list) {
2146                 /* Look if it is in the list */
2147                 if (i) {
2148                         in = ylist_entry(i, yaffs_Object, hashLink);
2149                         if (in->objectId == number) {
2150 #ifdef __KERNEL__
2151                                 /* Don't tell the VFS about this one if it is defered free */
2152                                 if (in->deferedFree)
2153                                         return NULL;
2154 #endif
2155
2156                                 return in;
2157                         }
2158                 }
2159         }
2160
2161         return NULL;
2162 }
2163
2164 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
2165                                     yaffs_ObjectType type)
2166 {
2167         yaffs_Object *theObject;
2168         yaffs_Tnode *tn = NULL;
2169
2170         if (number < 0)
2171                 number = yaffs_CreateNewObjectNumber(dev);
2172
2173         theObject = yaffs_AllocateEmptyObject(dev);
2174         if (!theObject)
2175                 return NULL;
2176
2177         if (type == YAFFS_OBJECT_TYPE_FILE) {
2178                 tn = yaffs_GetTnode(dev);
2179                 if (!tn) {
2180                         yaffs_FreeObject(theObject);
2181                         return NULL;
2182                 }
2183         }
2184
2185         if (theObject) {
2186                 theObject->fake = 0;
2187                 theObject->renameAllowed = 1;
2188                 theObject->unlinkAllowed = 1;
2189                 theObject->objectId = number;
2190                 yaffs_HashObject(theObject);
2191                 theObject->variantType = type;
2192 #ifdef CONFIG_YAFFS_WINCE
2193                 yfsd_WinFileTimeNow(theObject->win_atime);
2194                 theObject->win_ctime[0] = theObject->win_mtime[0] =
2195                     theObject->win_atime[0];
2196                 theObject->win_ctime[1] = theObject->win_mtime[1] =
2197                     theObject->win_atime[1];
2198
2199 #else
2200
2201                 theObject->yst_atime = theObject->yst_mtime =
2202                     theObject->yst_ctime = Y_CURRENT_TIME;
2203 #endif
2204                 switch (type) {
2205                 case YAFFS_OBJECT_TYPE_FILE:
2206                         theObject->variant.fileVariant.fileSize = 0;
2207                         theObject->variant.fileVariant.scannedFileSize = 0;
2208                         theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
2209                         theObject->variant.fileVariant.topLevel = 0;
2210                         theObject->variant.fileVariant.top = tn;
2211                         break;
2212                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2213                         YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
2214                                         children);
2215                         break;
2216                 case YAFFS_OBJECT_TYPE_SYMLINK:
2217                 case YAFFS_OBJECT_TYPE_HARDLINK:
2218                 case YAFFS_OBJECT_TYPE_SPECIAL:
2219                         /* No action required */
2220                         break;
2221                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2222                         /* todo this should not happen */
2223                         break;
2224                 }
2225         }
2226
2227         return theObject;
2228 }
2229
2230 static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
2231                                                       int number,
2232                                                       yaffs_ObjectType type)
2233 {
2234         yaffs_Object *theObject = NULL;
2235
2236         if (number > 0)
2237                 theObject = yaffs_FindObjectByNumber(dev, number);
2238
2239         if (!theObject)
2240                 theObject = yaffs_CreateNewObject(dev, number, type);
2241
2242         return theObject;
2243
2244 }
2245
2246
2247 static YCHAR *yaffs_CloneString(const YCHAR *str)
2248 {
2249         YCHAR *newStr = NULL;
2250
2251         if (str && *str) {
2252                 newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
2253                 if (newStr)
2254                         yaffs_strcpy(newStr, str);
2255         }
2256
2257         return newStr;
2258
2259 }
2260
2261 /*
2262  * Mknod (create) a new object.
2263  * equivalentObject only has meaning for a hard link;
2264  * aliasString only has meaning for a sumlink.
2265  * rdev only has meaning for devices (a subset of special objects)
2266  */
2267
2268 static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
2269                                        yaffs_Object *parent,
2270                                        const YCHAR *name,
2271                                        __u32 mode,
2272                                        __u32 uid,
2273                                        __u32 gid,
2274                                        yaffs_Object *equivalentObject,
2275                                        const YCHAR *aliasString, __u32 rdev)
2276 {
2277         yaffs_Object *in;
2278         YCHAR *str = NULL;
2279
2280         yaffs_Device *dev = parent->myDev;
2281
2282         /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
2283         if (yaffs_FindObjectByName(parent, name))
2284                 return NULL;
2285
2286         in = yaffs_CreateNewObject(dev, -1, type);
2287
2288         if (!in)
2289                 return YAFFS_FAIL;
2290
2291         if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
2292                 str = yaffs_CloneString(aliasString);
2293                 if (!str) {
2294                         yaffs_FreeObject(in);
2295                         return NULL;
2296                 }
2297         }
2298
2299
2300
2301         if (in) {
2302                 in->hdrChunk = 0;
2303                 in->valid = 1;
2304                 in->variantType = type;
2305
2306                 in->yst_mode = mode;
2307
2308 #ifdef CONFIG_YAFFS_WINCE
2309                 yfsd_WinFileTimeNow(in->win_atime);
2310                 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
2311                 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
2312
2313 #else
2314                 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
2315
2316                 in->yst_rdev = rdev;
2317                 in->yst_uid = uid;
2318                 in->yst_gid = gid;
2319 #endif
2320                 in->nDataChunks = 0;
2321
2322                 yaffs_SetObjectName(in, name);
2323                 in->dirty = 1;
2324
2325                 yaffs_AddObjectToDirectory(parent, in);
2326
2327                 in->myDev = parent->myDev;
2328
2329                 switch (type) {
2330                 case YAFFS_OBJECT_TYPE_SYMLINK:
2331                         in->variant.symLinkVariant.alias = str;
2332                         break;
2333                 case YAFFS_OBJECT_TYPE_HARDLINK:
2334                         in->variant.hardLinkVariant.equivalentObject =
2335                                 equivalentObject;
2336                         in->variant.hardLinkVariant.equivalentObjectId =
2337                                 equivalentObject->objectId;
2338                         ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
2339                         break;
2340                 case YAFFS_OBJECT_TYPE_FILE:
2341                 case YAFFS_OBJECT_TYPE_DIRECTORY:
2342                 case YAFFS_OBJECT_TYPE_SPECIAL:
2343                 case YAFFS_OBJECT_TYPE_UNKNOWN:
2344                         /* do nothing */
2345                         break;
2346                 }
2347
2348                 if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
2349                         /* Could not create the object header, fail the creation */
2350                         yaffs_DeleteObject(in);
2351                         in = NULL;
2352                 }
2353
2354                 yaffs_UpdateParent(parent);
2355         }
2356
2357         return in;
2358 }
2359
2360 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
2361                         __u32 mode, __u32 uid, __u32 gid)
2362 {
2363         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
2364                                 uid, gid, NULL, NULL, 0);
2365 }
2366
2367 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
2368                                 __u32 mode, __u32 uid, __u32 gid)
2369 {
2370         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
2371                                  mode, uid, gid, NULL, NULL, 0);
2372 }
2373
2374 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
2375                                 __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
2376 {
2377         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
2378                                  uid, gid, NULL, NULL, rdev);
2379 }
2380
2381 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
2382                                 __u32 mode, __u32 uid, __u32 gid,
2383                                 const YCHAR *alias)
2384 {
2385         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
2386                                 uid, gid, NULL, alias, 0);
2387 }
2388
2389 /* yaffs_Link returns the object id of the equivalent object.*/
2390 yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
2391                         yaffs_Object *equivalentObject)
2392 {
2393         /* Get the real object in case we were fed a hard link as an equivalent object */
2394         equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
2395
2396         if (yaffs_MknodObject
2397             (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
2398              equivalentObject, NULL, 0)) {
2399                 return equivalentObject;
2400         } else {
2401                 return NULL;
2402         }
2403
2404 }
2405
2406 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
2407                                 const YCHAR *newName, int force, int shadows)
2408 {
2409         int unlinkOp;
2410         int deleteOp;
2411
2412         yaffs_Object *existingTarget;
2413
2414         if (newDir == NULL)
2415                 newDir = obj->parent;   /* use the old directory */
2416
2417         if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
2418                 T(YAFFS_TRACE_ALWAYS,
2419                   (TSTR
2420                    ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
2421                     TENDSTR)));
2422                 YBUG();
2423         }
2424
2425         /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
2426         if (obj->myDev->isYaffs2)
2427                 unlinkOp = (newDir == obj->myDev->unlinkedDir);
2428         else
2429                 unlinkOp = (newDir == obj->myDev->unlinkedDir
2430                             && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
2431
2432         deleteOp = (newDir == obj->myDev->deletedDir);
2433
2434         existingTarget = yaffs_FindObjectByName(newDir, newName);
2435
2436         /* If the object is a file going into the unlinked directory,
2437          *   then it is OK to just stuff it in since duplicate names are allowed.
2438          *   else only proceed if the new name does not exist and if we're putting
2439          *   it into a directory.
2440          */
2441         if ((unlinkOp ||
2442              deleteOp ||
2443              force ||
2444              (shadows > 0) ||
2445              !existingTarget) &&
2446             newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
2447                 yaffs_SetObjectName(obj, newName);
2448                 obj->dirty = 1;
2449
2450                 yaffs_AddObjectToDirectory(newDir, obj);
2451
2452                 if (unlinkOp)
2453                         obj->unlinked = 1;
2454
2455                 /* If it is a deletion then we mark it as a shrink for gc purposes. */
2456                 if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
2457                         return YAFFS_OK;
2458         }
2459
2460         return YAFFS_FAIL;
2461 }
2462
2463 int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
2464                 yaffs_Object *newDir, const YCHAR *newName)
2465 {
2466         yaffs_Object *obj = NULL;
2467         yaffs_Object *existingTarget = NULL;
2468         int force = 0;
2469
2470
2471         if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2472                 YBUG();
2473         if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
2474                 YBUG();
2475
2476 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
2477         /* Special case for case insemsitive systems (eg. WinCE).
2478          * While look-up is case insensitive, the name isn't.
2479          * Therefore we might want to change x.txt to X.txt
2480         */
2481         if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
2482                 force = 1;
2483 #endif
2484
2485         else if (yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
2486                 /* ENAMETOOLONG */
2487                 return YAFFS_FAIL;
2488
2489         obj = yaffs_FindObjectByName(oldDir, oldName);
2490
2491         if (obj && obj->renameAllowed) {
2492
2493                 /* Now do the handling for an existing target, if there is one */
2494
2495                 existingTarget = yaffs_FindObjectByName(newDir, newName);
2496                 if (existingTarget &&
2497                         existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
2498                         !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
2499                         /* There is a target that is a non-empty directory, so we fail */
2500                         return YAFFS_FAIL;      /* EEXIST or ENOTEMPTY */
2501                 } else if (existingTarget && existingTarget != obj) {
2502                         /* Nuke the target first, using shadowing,
2503                          * but only if it isn't the same object
2504                          */
2505                         yaffs_ChangeObjectName(obj, newDir, newName, force,
2506                                                 existingTarget->objectId);
2507                         yaffs_UnlinkObject(existingTarget);
2508                 }
2509                 yaffs_UpdateParent(oldDir);
2510                 if(newDir != oldDir)
2511                         yaffs_UpdateParent(newDir);
2512
2513                 return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
2514         }
2515         return YAFFS_FAIL;
2516 }
2517
2518 /*------------------------- Block Management and Page Allocation ----------------*/
2519
2520 static int yaffs_InitialiseBlocks(yaffs_Device *dev)
2521 {
2522         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
2523
2524         dev->blockInfo = NULL;
2525         dev->chunkBits = NULL;
2526
2527         dev->allocationBlock = -1;      /* force it to get a new one */
2528
2529         /* If the first allocation strategy fails, thry the alternate one */
2530         dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2531         if (!dev->blockInfo) {
2532                 dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
2533                 dev->blockInfoAlt = 1;
2534         } else
2535                 dev->blockInfoAlt = 0;
2536
2537         if (dev->blockInfo) {
2538                 /* Set up dynamic blockinfo stuff. */
2539                 dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
2540                 dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2541                 if (!dev->chunkBits) {
2542                         dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
2543                         dev->chunkBitsAlt = 1;
2544                 } else
2545                         dev->chunkBitsAlt = 0;
2546         }
2547
2548         if (dev->blockInfo && dev->chunkBits) {
2549                 memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
2550                 memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
2551                 return YAFFS_OK;
2552         }
2553
2554         return YAFFS_FAIL;
2555 }
2556
2557 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2558 {
2559         if (dev->blockInfoAlt && dev->blockInfo)
2560                 YFREE_ALT(dev->blockInfo);
2561         else if (dev->blockInfo)
2562                 YFREE(dev->blockInfo);
2563
2564         dev->blockInfoAlt = 0;
2565
2566         dev->blockInfo = NULL;
2567
2568         if (dev->chunkBitsAlt && dev->chunkBits)
2569                 YFREE_ALT(dev->chunkBits);
2570         else if (dev->chunkBits)
2571                 YFREE(dev->chunkBits);
2572         dev->chunkBitsAlt = 0;
2573         dev->chunkBits = NULL;
2574 }
2575
2576 static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
2577                                         yaffs_BlockInfo *bi)
2578 {
2579         int i;
2580         __u32 seq;
2581         yaffs_BlockInfo *b;
2582
2583         if (!dev->isYaffs2)
2584                 return 1;       /* disqualification only applies to yaffs2. */
2585
2586         if (!bi->hasShrinkHeader)
2587                 return 1;       /* can gc */
2588
2589         /* Find the oldest dirty sequence number if we don't know it and save it
2590          * so we don't have to keep recomputing it.
2591          */
2592         if (!dev->oldestDirtySequence) {
2593                 seq = dev->sequenceNumber;
2594
2595                 for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
2596                                 i++) {
2597                         b = yaffs_GetBlockInfo(dev, i);
2598                         if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
2599                             (b->pagesInUse - b->softDeletions) <
2600                             dev->nChunksPerBlock && b->sequenceNumber < seq) {
2601                                 seq = b->sequenceNumber;
2602                         }
2603                 }
2604                 dev->oldestDirtySequence = seq;
2605         }
2606
2607         /* Can't do gc of this block if there are any blocks older than this one that have
2608          * discarded pages.
2609          */
2610         return (bi->sequenceNumber <= dev->oldestDirtySequence);
2611 }
2612
2613 /* FindDiretiestBlock is used to select the dirtiest block (or close enough)
2614  * for garbage collection.
2615  */
2616
2617 static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
2618                                         int aggressive)
2619 {
2620         int b = dev->currentDirtyChecker;
2621
2622         int i;
2623         int iterations;
2624         int dirtiest = -1;
2625         int pagesInUse = 0;
2626         int prioritised = 0;
2627         yaffs_BlockInfo *bi;
2628         int pendingPrioritisedExist = 0;
2629
2630         /* First let's see if we need to grab a prioritised block */
2631         if (dev->hasPendingPrioritisedGCs) {
2632                 for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
2633
2634                         bi = yaffs_GetBlockInfo(dev, i);
2635                         /* yaffs_VerifyBlock(dev,bi,i); */
2636
2637                         if (bi->gcPrioritise) {
2638                                 pendingPrioritisedExist = 1;
2639                                 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2640                                    yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2641                                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2642                                         dirtiest = i;
2643                                         prioritised = 1;
2644                                         aggressive = 1; /* Fool the non-aggressive skip logiv below */
2645                                 }
2646                         }
2647                 }
2648
2649                 if (!pendingPrioritisedExist) /* None found, so we can clear this */
2650                         dev->hasPendingPrioritisedGCs = 0;
2651         }
2652
2653         /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
2654          * search harder.
2655          * else (we're doing a leasurely gc), then we only bother to do this if the
2656          * block has only a few pages in use.
2657          */
2658
2659         dev->nonAggressiveSkip--;
2660
2661         if (!aggressive && (dev->nonAggressiveSkip > 0))
2662                 return -1;
2663
2664         if (!prioritised)
2665                 pagesInUse =
2666                         (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2667
2668         if (aggressive)
2669                 iterations =
2670                     dev->internalEndBlock - dev->internalStartBlock + 1;
2671         else {
2672                 iterations =
2673                     dev->internalEndBlock - dev->internalStartBlock + 1;
2674                 iterations = iterations / 16;
2675                 if (iterations > 200)
2676                         iterations = 200;
2677         }
2678
2679         for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
2680                 b++;
2681                 if (b < dev->internalStartBlock || b > dev->internalEndBlock)
2682                         b = dev->internalStartBlock;
2683
2684                 if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
2685                         T(YAFFS_TRACE_ERROR,
2686                           (TSTR("**>> Block %d is not valid" TENDSTR), b));
2687                         YBUG();
2688                 }
2689
2690                 bi = yaffs_GetBlockInfo(dev, b);
2691
2692                 if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2693                         (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
2694                                 yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
2695                         dirtiest = b;
2696                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2697                 }
2698         }
2699
2700         dev->currentDirtyChecker = b;
2701
2702         if (dirtiest > 0) {
2703                 T(YAFFS_TRACE_GC,
2704                   (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
2705                    dev->nChunksPerBlock - pagesInUse, prioritised));
2706         }
2707
2708         dev->oldestDirtySequence = 0;
2709
2710         if (dirtiest > 0)
2711                 dev->nonAggressiveSkip = 4;
2712
2713         return dirtiest;
2714 }
2715
2716 static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
2717 {
2718         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
2719
2720         int erasedOk = 0;
2721
2722         /* If the block is still healthy erase it and mark as clean.
2723          * If the block has had a data failure, then retire it.
2724          */
2725
2726         T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
2727                 (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
2728                 blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
2729
2730         bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2731
2732         if (!bi->needsRetiring) {
2733                 yaffs_InvalidateCheckpoint(dev);
2734                 erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
2735                 if (!erasedOk) {
2736                         dev->nErasureFailures++;
2737                         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2738                           (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
2739                 }
2740         }
2741
2742         if (erasedOk &&
2743             ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
2744                 int i;
2745                 for (i = 0; i < dev->nChunksPerBlock; i++) {
2746                         if (!yaffs_CheckChunkErased
2747                             (dev, blockNo * dev->nChunksPerBlock + i)) {
2748                                 T(YAFFS_TRACE_ERROR,
2749                                   (TSTR
2750                                    (">>Block %d erasure supposedly OK, but chunk %d not erased"
2751                                     TENDSTR), blockNo, i));
2752                         }
2753                 }
2754         }
2755
2756         if (erasedOk) {
2757                 /* Clean it up... */
2758                 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2759                 dev->nErasedBlocks++;
2760                 bi->pagesInUse = 0;
2761                 bi->softDeletions = 0;
2762                 bi->hasShrinkHeader = 0;
2763                 bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
2764                 bi->gcPrioritise = 0;
2765                 yaffs_ClearChunkBits(dev, blockNo);
2766
2767                 T(YAFFS_TRACE_ERASE,
2768                   (TSTR("Erased block %d" TENDSTR), blockNo));
2769         } else {
2770                 dev->nFreeChunks -= dev->nChunksPerBlock;       /* We lost a block of free space */
2771
2772                 yaffs_RetireBlock(dev, blockNo);
2773                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
2774                   (TSTR("**>> Block %d retired" TENDSTR), blockNo));
2775         }
2776 }
2777
2778 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2779 {
2780         int i;
2781
2782         yaffs_BlockInfo *bi;
2783
2784         if (dev->nErasedBlocks < 1) {
2785                 /* Hoosterman we've got a problem.
2786                  * Can't get space to gc
2787                  */
2788                 T(YAFFS_TRACE_ERROR,
2789                   (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
2790
2791                 return -1;
2792         }
2793
2794         /* Find an empty block. */
2795
2796         for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
2797                 dev->allocationBlockFinder++;
2798                 if (dev->allocationBlockFinder < dev->internalStartBlock
2799                     || dev->allocationBlockFinder > dev->internalEndBlock) {
2800                         dev->allocationBlockFinder = dev->internalStartBlock;
2801                 }
2802
2803                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
2804
2805                 if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
2806                         bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2807                         dev->sequenceNumber++;
2808                         bi->sequenceNumber = dev->sequenceNumber;
2809                         dev->nErasedBlocks--;
2810                         T(YAFFS_TRACE_ALLOCATE,
2811                           (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
2812                            dev->allocationBlockFinder, dev->sequenceNumber,
2813                            dev->nErasedBlocks));
2814                         return dev->allocationBlockFinder;
2815                 }
2816         }
2817
2818         T(YAFFS_TRACE_ALWAYS,
2819           (TSTR
2820            ("yaffs tragedy: no more erased blocks, but there should have been %d"
2821             TENDSTR), dev->nErasedBlocks));
2822
2823         return -1;
2824 }
2825
2826
2827
2828 static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
2829 {
2830         if (!dev->nCheckpointBlocksRequired &&
2831            dev->isYaffs2) {
2832                 /* Not a valid value so recalculate */
2833                 int nBytes = 0;
2834                 int nBlocks;
2835                 int devBlocks = (dev->endBlock - dev->startBlock + 1);
2836                 int tnodeSize;
2837
2838                 tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
2839
2840                 if (tnodeSize < sizeof(yaffs_Tnode))
2841                         tnodeSize = sizeof(yaffs_Tnode);
2842
2843                 nBytes += sizeof(yaffs_CheckpointValidity);
2844                 nBytes += sizeof(yaffs_CheckpointDevice);
2845                 nBytes += devBlocks * sizeof(yaffs_BlockInfo);
2846                 nBytes += devBlocks * dev->chunkBitmapStride;
2847                 nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
2848                 nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
2849                 nBytes += sizeof(yaffs_CheckpointValidity);
2850                 nBytes += sizeof(__u32); /* checksum*/
2851
2852                 /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
2853
2854                 nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->nChunksPerBlock)) + 3;
2855
2856                 dev->nCheckpointBlocksRequired = nBlocks;
2857         }
2858
2859         return dev->nCheckpointBlocksRequired;
2860 }
2861
2862 /*
2863  * Check if there's space to allocate...
2864  * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
2865  */
2866 static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev)
2867 {
2868         int reservedChunks;
2869         int reservedBlocks = dev->nReservedBlocks;
2870         int checkpointBlocks;
2871
2872         if (dev->isYaffs2) {
2873                 checkpointBlocks =  yaffs_CalcCheckpointBlocksRequired(dev) -
2874                                     dev->blocksInCheckpoint;
2875                 if (checkpointBlocks < 0)
2876                         checkpointBlocks = 0;
2877         } else {
2878                 checkpointBlocks = 0;
2879         }
2880
2881         reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
2882
2883         return (dev->nFreeChunks > reservedChunks);
2884 }
2885
2886 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
2887                 yaffs_BlockInfo **blockUsedPtr)
2888 {
2889         int retVal;
2890         yaffs_BlockInfo *bi;
2891
2892         if (dev->allocationBlock < 0) {
2893                 /* Get next block to allocate off */
2894                 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2895                 dev->allocationPage = 0;
2896         }
2897
2898         if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
2899                 /* Not enough space to allocate unless we're allowed to use the reserve. */
2900                 return -1;
2901         }
2902
2903         if (dev->nErasedBlocks < dev->nReservedBlocks
2904                         && dev->allocationPage == 0) {
2905                 T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
2906         }
2907
2908         /* Next page please.... */
2909         if (dev->allocationBlock >= 0) {
2910                 bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
2911
2912                 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2913                         dev->allocationPage;
2914                 bi->pagesInUse++;
2915                 yaffs_SetChunkBit(dev, dev->allocationBlock,
2916                                 dev->allocationPage);
2917
2918                 dev->allocationPage++;
2919
2920                 dev->nFreeChunks--;
2921
2922                 /* If the block is full set the state to full */
2923                 if (dev->allocationPage >= dev->nChunksPerBlock) {
2924                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
2925                         dev->allocationBlock = -1;
2926                 }
2927
2928                 if (blockUsedPtr)
2929                         *blockUsedPtr = bi;
2930
2931                 return retVal;
2932         }
2933
2934         T(YAFFS_TRACE_ERROR,
2935                         (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2936
2937         return -1;
2938 }
2939
2940 static int yaffs_GetErasedChunks(yaffs_Device *dev)
2941 {
2942         int n;
2943
2944         n = dev->nErasedBlocks * dev->nChunksPerBlock;
2945
2946         if (dev->allocationBlock > 0)
2947                 n += (dev->nChunksPerBlock - dev->allocationPage);
2948
2949         return n;
2950
2951 }
2952
2953 static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
2954                 int wholeBlock)
2955 {
2956         int oldChunk;
2957         int newChunk;
2958         int markNAND;
2959         int retVal = YAFFS_OK;
2960         int cleanups = 0;
2961         int i;
2962         int isCheckpointBlock;
2963         int matchingChunk;
2964         int maxCopies;
2965
2966         int chunksBefore = yaffs_GetErasedChunks(dev);
2967         int chunksAfter;
2968
2969         yaffs_ExtendedTags tags;
2970
2971         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
2972
2973         yaffs_Object *object;
2974
2975         isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
2976
2977
2978         T(YAFFS_TRACE_TRACING,
2979                         (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
2980                          block,
2981                          bi->pagesInUse,
2982                          bi->hasShrinkHeader,
2983                          wholeBlock));
2984
2985         /*yaffs_VerifyFreeChunks(dev); */
2986
2987         if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
2988                 bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
2989
2990         bi->hasShrinkHeader = 0;        /* clear the flag so that the block can erase */
2991
2992         /* Take off the number of soft deleted entries because
2993          * they're going to get really deleted during GC.
2994          */
2995         if(dev->gcChunk == 0) /* first time through for this block */
2996                 dev->nFreeChunks -= bi->softDeletions;
2997
2998         dev->isDoingGC = 1;
2999
3000         if (isCheckpointBlock ||
3001                         !yaffs_StillSomeChunkBits(dev, block)) {
3002                 T(YAFFS_TRACE_TRACING,
3003                                 (TSTR
3004                                  ("Collecting block %d that has no chunks in use" TENDSTR),
3005                                  block));
3006                 yaffs_BlockBecameDirty(dev, block);
3007         } else {
3008
3009                 __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
3010
3011                 yaffs_VerifyBlock(dev, bi, block);
3012
3013                 maxCopies = (wholeBlock) ? dev->nChunksPerBlock : 10;
3014                 oldChunk = block * dev->nChunksPerBlock + dev->gcChunk;
3015
3016                 for (/* init already done */;
3017                      retVal == YAFFS_OK &&
3018                      dev->gcChunk < dev->nChunksPerBlock &&
3019                      (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
3020                      maxCopies > 0;
3021                      dev->gcChunk++, oldChunk++) {
3022                         if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
3023
3024                                 /* This page is in use and might need to be copied off */
3025
3026                                 maxCopies--;
3027
3028                                 markNAND = 1;
3029
3030                                 yaffs_InitialiseTags(&tags);
3031
3032                                 yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
3033                                                                 buffer, &tags);
3034
3035                                 object =
3036                                     yaffs_FindObjectByNumber(dev,
3037                                                              tags.objectId);
3038
3039                                 T(YAFFS_TRACE_GC_DETAIL,
3040                                   (TSTR
3041                                    ("Collecting chunk in block %d, %d %d %d " TENDSTR),
3042                                    dev->gcChunk, tags.objectId, tags.chunkId,
3043                                    tags.byteCount));
3044
3045                                 if (object && !yaffs_SkipVerification(dev)) {
3046                                         if (tags.chunkId == 0)
3047                                                 matchingChunk = object->hdrChunk;
3048                                         else if (object->softDeleted)
3049                                                 matchingChunk = oldChunk; /* Defeat the test */
3050                                         else
3051                                                 matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
3052
3053                                         if (oldChunk != matchingChunk)
3054                                                 T(YAFFS_TRACE_ERROR,
3055                                                   (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
3056                                                   oldChunk, matchingChunk, tags.objectId, tags.chunkId));
3057
3058                                 }
3059
3060                                 if (!object) {
3061                                         T(YAFFS_TRACE_ERROR,
3062                                           (TSTR
3063                                            ("page %d in gc has no object: %d %d %d "
3064                                             TENDSTR), oldChunk,
3065                                             tags.objectId, tags.chunkId, tags.byteCount));
3066                                 }
3067
3068                                 if (object &&
3069                                     object->deleted &&
3070                                     object->softDeleted &&
3071                                     tags.chunkId != 0) {
3072                                         /* Data chunk in a soft deleted file, throw it away
3073                                          * It's a soft deleted data chunk,
3074                                          * No need to copy this, just forget about it and
3075                                          * fix up the object.
3076                                          */
3077
3078                                         object->nDataChunks--;
3079
3080                                         if (object->nDataChunks <= 0) {
3081                                                 /* remeber to clean up the object */
3082                                                 dev->gcCleanupList[cleanups] =
3083                                                     tags.objectId;
3084                                                 cleanups++;
3085                                         }
3086                                         markNAND = 0;
3087                                 } else if (0) {
3088                                         /* Todo object && object->deleted && object->nDataChunks == 0 */
3089                                         /* Deleted object header with no data chunks.
3090                                          * Can be discarded and the file deleted.
3091                                          */
3092                                         object->hdrChunk = 0;
3093                                         yaffs_FreeTnode(object->myDev,
3094                                                         object->variant.
3095                                                         fileVariant.top);
3096                                         object->variant.fileVariant.top = NULL;
3097                                         yaffs_DoGenericObjectDeletion(object);
3098
3099                                 } else if (object) {
3100                                         /* It's either a data chunk in a live file or
3101                                          * an ObjectHeader, so we're interested in it.
3102                                          * NB Need to keep the ObjectHeaders of deleted files
3103                                          * until the whole file has been deleted off
3104                                          */
3105                                         tags.serialNumber++;
3106
3107                                         dev->nGCCopies++;
3108
3109                                         if (tags.chunkId == 0) {
3110                                                 /* It is an object Id,
3111                                                  * We need to nuke the shrinkheader flags first
3112                                                  * We no longer want the shrinkHeader flag since its work is done
3113                                                  * and if it is left in place it will mess up scanning.
3114                                                  */
3115
3116                                                 yaffs_ObjectHeader *oh;
3117                                                 oh = (yaffs_ObjectHeader *)buffer;
3118                                                 oh->isShrink = 0;
3119                                                 tags.extraIsShrinkHeader = 0;
3120
3121                                                 yaffs_VerifyObjectHeader(object, oh, &tags, 1);
3122                                         }
3123
3124                                         newChunk =
3125                                             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
3126
3127                                         if (newChunk < 0) {
3128                                                 retVal = YAFFS_FAIL;
3129                                         } else {
3130
3131                                                 /* Ok, now fix up the Tnodes etc. */
3132
3133                                                 if (tags.chunkId == 0) {
3134                                                         /* It's a header */
3135                                                         object->hdrChunk =  newChunk;
3136                                                         object->serial =   tags.serialNumber;
3137                                                 } else {
3138                                                         /* It's a data chunk */
3139                                                         yaffs_PutChunkIntoFile
3140                                                             (object,
3141                                                              tags.chunkId,
3142                                                              newChunk, 0);
3143                                                 }
3144                                         }
3145                                 }
3146
3147                                 if (retVal == YAFFS_OK)
3148                                         yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
3149
3150                         }
3151                 }
3152
3153                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3154
3155
3156                 /* Do any required cleanups */
3157                 for (i = 0; i < cleanups; i++) {
3158                         /* Time to delete the file too */
3159                         object =
3160                             yaffs_FindObjectByNumber(dev,
3161                                                      dev->gcCleanupList[i]);
3162                         if (object) {
3163                                 yaffs_FreeTnode(dev,
3164                                                 object->variant.fileVariant.
3165                                                 top);
3166                                 object->variant.fileVariant.top = NULL;
3167                                 T(YAFFS_TRACE_GC,
3168                                   (TSTR
3169                                    ("yaffs: About to finally delete object %d"
3170                                     TENDSTR), object->objectId));
3171                                 yaffs_DoGenericObjectDeletion(object);
3172                                 object->myDev->nDeletedFiles--;
3173                         }
3174
3175                 }
3176
3177         }
3178
3179         yaffs_VerifyCollectedBlock(dev, bi, block);
3180
3181         chunksAfter = yaffs_GetErasedChunks(dev);
3182         if (chunksBefore >= chunksAfter) {
3183                 T(YAFFS_TRACE_GC,
3184                   (TSTR
3185                    ("gc did not increase free chunks before %d after %d"
3186                     TENDSTR), chunksBefore, chunksAfter));
3187         }
3188
3189         /* If the gc completed then clear the current gcBlock so that we find another. */
3190         if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
3191                 dev->gcBlock = -1;
3192                 dev->gcChunk = 0;
3193         }
3194
3195         dev->isDoingGC = 0;
3196
3197         return retVal;
3198 }
3199
3200 /* New garbage collector
3201  * If we're very low on erased blocks then we do aggressive garbage collection
3202  * otherwise we do "leasurely" garbage collection.
3203  * Aggressive gc looks further (whole array) and will accept less dirty blocks.
3204  * Passive gc only inspects smaller areas and will only accept more dirty blocks.
3205  *
3206  * The idea is to help clear out space in a more spread-out manner.
3207  * Dunno if it really does anything useful.
3208  */
3209 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
3210 {
3211         int block;
3212         int aggressive;
3213         int gcOk = YAFFS_OK;
3214         int maxTries = 0;
3215
3216         int checkpointBlockAdjust;
3217
3218         if (dev->isDoingGC) {
3219                 /* Bail out so we don't get recursive gc */
3220                 return YAFFS_OK;
3221         }
3222
3223         /* This loop should pass the first time.
3224          * We'll only see looping here if the erase of the collected block fails.
3225          */
3226
3227         do {
3228                 maxTries++;
3229
3230                 checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
3231                 if (checkpointBlockAdjust < 0)
3232                         checkpointBlockAdjust = 0;
3233
3234                 if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
3235                         /* We need a block soon...*/
3236                         aggressive = 1;
3237                 } else {
3238                         /* We're in no hurry */
3239                         aggressive = 0;
3240                 }
3241
3242                 if (dev->gcBlock <= 0) {
3243                         dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
3244                         dev->gcChunk = 0;
3245                 }
3246
3247                 block = dev->gcBlock;
3248
3249                 if (block > 0) {
3250                         dev->garbageCollections++;
3251                         if (!aggressive)
3252                                 dev->passiveGarbageCollections++;
3253
3254                         T(YAFFS_TRACE_GC,
3255                           (TSTR
3256                            ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
3257                            dev->nErasedBlocks, aggressive));
3258
3259                         gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
3260                 }
3261
3262                 if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
3263                         T(YAFFS_TRACE_GC,
3264                           (TSTR
3265                            ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
3266                             TENDSTR), dev->nErasedBlocks, maxTries, block));
3267                 }
3268         } while ((dev->nErasedBlocks < dev->nReservedBlocks) &&
3269                  (block > 0) &&
3270                  (maxTries < 2));
3271
3272         return aggressive ? gcOk : YAFFS_OK;
3273 }
3274
3275 /*-------------------------  TAGS --------------------------------*/
3276
3277 static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
3278                            int chunkInObject)
3279 {
3280         return (tags->chunkId == chunkInObject &&
3281                 tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
3282
3283 }
3284
3285
3286 /*-------------------- Data file manipulation -----------------*/
3287
3288 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
3289                                  yaffs_ExtendedTags *tags)
3290 {
3291         /*Get the Tnode, then get the level 0 offset chunk offset */
3292         yaffs_Tnode *tn;
3293         int theChunk = -1;
3294         yaffs_ExtendedTags localTags;
3295         int retVal = -1;
3296
3297         yaffs_Device *dev = in->myDev;
3298
3299         if (!tags) {
3300                 /* Passed a NULL, so use our own tags space */
3301                 tags = &localTags;
3302         }
3303
3304         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3305
3306         if (tn) {
3307                 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3308
3309                 retVal =
3310                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3311                                            chunkInInode);
3312         }
3313         return retVal;
3314 }
3315
3316 static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
3317                                           yaffs_ExtendedTags *tags)
3318 {
3319         /* Get the Tnode, then get the level 0 offset chunk offset */
3320         yaffs_Tnode *tn;
3321         int theChunk = -1;
3322         yaffs_ExtendedTags localTags;
3323
3324         yaffs_Device *dev = in->myDev;
3325         int retVal = -1;
3326
3327         if (!tags) {
3328                 /* Passed a NULL, so use our own tags space */
3329                 tags = &localTags;
3330         }
3331
3332         tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
3333
3334         if (tn) {
3335
3336                 theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3337
3338                 retVal =
3339                     yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
3340                                            chunkInInode);
3341
3342                 /* Delete the entry in the filestructure (if found) */
3343                 if (retVal != -1)
3344                         yaffs_PutLevel0Tnode(dev, tn, chunkInInode, 0);
3345         }
3346
3347         return retVal;
3348 }
3349
3350 #ifdef YAFFS_PARANOID
3351
3352 static int yaffs_CheckFileSanity(yaffs_Object *in)
3353 {
3354         int chunk;
3355         int nChunks;
3356         int fSize;
3357         int failed = 0;
3358         int objId;
3359         yaffs_Tnode *tn;
3360         yaffs_Tags localTags;
3361         yaffs_Tags *tags = &localTags;
3362         int theChunk;
3363         int chunkDeleted;
3364
3365         if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
3366                 return YAFFS_FAIL;
3367
3368         objId = in->objectId;
3369         fSize = in->variant.fileVariant.fileSize;
3370         nChunks =
3371             (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
3372
3373         for (chunk = 1; chunk <= nChunks; chunk++) {
3374                 tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
3375                                            chunk);
3376
3377                 if (tn) {
3378
3379                         theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
3380
3381                         if (yaffs_CheckChunkBits
3382                             (dev, theChunk / dev->nChunksPerBlock,
3383                              theChunk % dev->nChunksPerBlock)) {
3384
3385                                 yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
3386                                                             tags,
3387                                                             &chunkDeleted);
3388                                 if (yaffs_TagsMatch
3389                                     (tags, in->objectId, chunk, chunkDeleted)) {
3390                                         /* found it; */
3391
3392                                 }
3393                         } else {
3394
3395                                 failed = 1;
3396                         }
3397
3398                 } else {
3399                         /* T(("No level 0 found for %d\n", chunk)); */
3400                 }
3401         }
3402
3403         return failed ? YAFFS_FAIL : YAFFS_OK;
3404 }
3405
3406 #endif
3407
3408 static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
3409                                   int chunkInNAND, int inScan)
3410 {
3411         /* NB inScan is zero unless scanning.
3412          * For forward scanning, inScan is > 0;
3413          * for backward scanning inScan is < 0
3414          */
3415
3416         yaffs_Tnode *tn;
3417         yaffs_Device *dev = in->myDev;
3418         int existingChunk;
3419         yaffs_ExtendedTags existingTags;
3420         yaffs_ExtendedTags newTags;
3421         unsigned existingSerial, newSerial;
3422
3423         if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
3424                 /* Just ignore an attempt at putting a chunk into a non-file during scanning
3425                  * If it is not during Scanning then something went wrong!
3426                  */
3427                 if (!inScan) {
3428                         T(YAFFS_TRACE_ERROR,
3429                           (TSTR
3430                            ("yaffs tragedy:attempt to put data chunk into a non-file"
3431                             TENDSTR)));
3432                         YBUG();
3433                 }
3434
3435                 yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
3436                 return YAFFS_OK;
3437         }
3438
3439         tn = yaffs_AddOrFindLevel0Tnode(dev,
3440                                         &in->variant.fileVariant,
3441                                         chunkInInode,
3442                                         NULL);
3443         if (!tn)
3444                 return YAFFS_FAIL;
3445
3446         existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
3447
3448         if (inScan != 0) {
3449                 /* If we're scanning then we need to test for duplicates
3450                  * NB This does not need to be efficient since it should only ever
3451                  * happen when the power fails during a write, then only one
3452                  * chunk should ever be affected.
3453                  *
3454                  * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
3455                  * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
3456                  */
3457
3458                 if (existingChunk > 0) {
3459                         /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
3460                          *    thus we have to do a FindChunkInFile to get the real chunk id.
3461                          *
3462                          * We have a duplicate now we need to decide which one to use:
3463                          *
3464                          * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
3465                          * Forward scanning YAFFS2: The new one is what we use, dump the old one.
3466                          * YAFFS1: Get both sets of tags and compare serial numbers.
3467                          */
3468
3469                         if (inScan > 0) {
3470                                 /* Only do this for forward scanning */
3471                                 yaffs_ReadChunkWithTagsFromNAND(dev,
3472                                                                 chunkInNAND,
3473                                                                 NULL, &newTags);
3474
3475                                 /* Do a proper find */
3476                                 existingChunk =
3477                                     yaffs_FindChunkInFile(in, chunkInInode,
3478                                                           &existingTags);
3479                         }
3480
3481                         if (existingChunk <= 0) {
3482                                 /*Hoosterman - how did this happen? */
3483
3484                                 T(YAFFS_TRACE_ERROR,
3485                                   (TSTR
3486                                    ("yaffs tragedy: existing chunk < 0 in scan"
3487                                     TENDSTR)));
3488
3489                         }
3490
3491                         /* NB The deleted flags should be false, otherwise the chunks will
3492                          * not be loaded during a scan
3493                          */
3494
3495                         if (inScan > 0) {
3496                                 newSerial = newTags.serialNumber;
3497                                 existingSerial = existingTags.serialNumber;
3498                         }
3499
3500                         if ((inScan > 0) &&
3501                             (in->myDev->isYaffs2 ||
3502                              existingChunk <= 0 ||
3503                              ((existingSerial + 1) & 3) == newSerial)) {
3504                                 /* Forward scanning.
3505                                  * Use new
3506                                  * Delete the old one and drop through to update the tnode
3507                                  */
3508                                 yaffs_DeleteChunk(dev, existingChunk, 1,
3509                                                   __LINE__);
3510                         } else {
3511                                 /* Backward scanning or we want to use the existing one
3512                                  * Use existing.
3513                                  * Delete the new one and return early so that the tnode isn't changed
3514                                  */
3515                                 yaffs_DeleteChunk(dev, chunkInNAND, 1,
3516                                                   __LINE__);
3517                                 return YAFFS_OK;
3518                         }
3519                 }
3520
3521         }
3522
3523         if (existingChunk == 0)
3524                 in->nDataChunks++;
3525
3526         yaffs_PutLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
3527
3528         return YAFFS_OK;
3529 }
3530
3531 static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
3532                                         __u8 *buffer)
3533 {
3534         int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
3535
3536         if (chunkInNAND >= 0)
3537                 return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
3538                                                 buffer, NULL);
3539         else {
3540                 T(YAFFS_TRACE_NANDACCESS,
3541                   (TSTR("Chunk %d not found zero instead" TENDSTR),
3542                    chunkInNAND));
3543                 /* get sane (zero) data if you read a hole */
3544                 memset(buffer, 0, in->myDev->nDataBytesPerChunk);
3545                 return 0;
3546         }
3547
3548 }
3549
3550 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
3551 {
3552         int block;
3553         int page;
3554         yaffs_ExtendedTags tags;
3555         yaffs_BlockInfo *bi;
3556
3557         if (chunkId <= 0)
3558                 return;
3559
3560         dev->nDeletions++;
3561         block = chunkId / dev->nChunksPerBlock;
3562         page = chunkId % dev->nChunksPerBlock;
3563
3564
3565         if (!yaffs_CheckChunkBit(dev, block, page))
3566                 T(YAFFS_TRACE_VERIFY,
3567                         (TSTR("Deleting invalid chunk %d"TENDSTR),
3568                          chunkId));
3569
3570         bi = yaffs_GetBlockInfo(dev, block);
3571
3572         T(YAFFS_TRACE_DELETION,
3573           (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
3574
3575         if (markNAND &&
3576             bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
3577
3578                 yaffs_InitialiseTags(&tags);
3579
3580                 tags.chunkDeleted = 1;
3581
3582                 yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
3583                 yaffs_HandleUpdateChunk(dev, chunkId, &tags);
3584         } else {
3585                 dev->nUnmarkedDeletions++;
3586         }
3587
3588         /* Pull out of the management area.
3589          * If the whole block became dirty, this will kick off an erasure.
3590          */
3591         if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
3592             bi->blockState == YAFFS_BLOCK_STATE_FULL ||
3593             bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
3594             bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
3595                 dev->nFreeChunks++;
3596
3597                 yaffs_ClearChunkBit(dev, block, page);
3598
3599                 bi->pagesInUse--;
3600
3601                 if (bi->pagesInUse == 0 &&
3602                     !bi->hasShrinkHeader &&
3603                     bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
3604                     bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
3605                         yaffs_BlockBecameDirty(dev, block);
3606                 }
3607
3608         }
3609
3610 }
3611
3612 static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
3613                                         const __u8 *buffer, int nBytes,
3614                                         int useReserve)
3615 {
3616         /* Find old chunk Need to do this to get serial number
3617          * Write new one and patch into tree.
3618          * Invalidate old tags.
3619          */
3620
3621         int prevChunkId;
3622         yaffs_ExtendedTags prevTags;
3623
3624         int newChunkId;
3625         yaffs_ExtendedTags newTags;
3626
3627         yaffs_Device *dev = in->myDev;
3628
3629         yaffs_CheckGarbageCollection(dev);
3630
3631         /* Get the previous chunk at this location in the file if it exists */
3632         prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
3633
3634         /* Set up new tags */
3635         yaffs_InitialiseTags(&newTags);
3636
3637         newTags.chunkId = chunkInInode;
3638         newTags.objectId = in->objectId;
3639         newTags.serialNumber =
3640             (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
3641         newTags.byteCount = nBytes;
3642
3643         if (nBytes < 1 || nBytes > dev->totalBytesPerChunk) {
3644                 T(YAFFS_TRACE_ERROR,
3645                 (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
3646                 YBUG();
3647         }
3648
3649         newChunkId =
3650             yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3651                                               useReserve);
3652
3653         if (newChunkId >= 0) {
3654                 yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
3655
3656                 if (prevChunkId > 0)
3657                         yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
3658
3659                 yaffs_CheckFileSanity(in);
3660         }
3661         return newChunkId;
3662
3663 }
3664
3665 /* UpdateObjectHeader updates the header on NAND for an object.
3666  * If name is not NULL, then that new name is used.
3667  */
3668 int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
3669                              int isShrink, int shadows)
3670 {
3671
3672         yaffs_BlockInfo *bi;
3673
3674         yaffs_Device *dev = in->myDev;
3675
3676         int prevChunkId;
3677         int retVal = 0;
3678         int result = 0;
3679
3680         int newChunkId;
3681         yaffs_ExtendedTags newTags;
3682         yaffs_ExtendedTags oldTags;
3683
3684         __u8 *buffer = NULL;
3685         YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
3686
3687         yaffs_ObjectHeader *oh = NULL;
3688
3689         yaffs_strcpy(oldName, _Y("silly old name"));
3690
3691
3692         if (!in->fake ||
3693                 in == dev->rootDir || /* The rootDir should also be saved */
3694                 force) {
3695
3696                 yaffs_CheckGarbageCollection(dev);
3697                 yaffs_CheckObjectDetailsLoaded(in);
3698
3699                 buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
3700                 oh = (yaffs_ObjectHeader *) buffer;
3701
3702                 prevChunkId = in->hdrChunk;
3703
3704                 if (prevChunkId > 0) {
3705                         result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
3706                                                         buffer, &oldTags);
3707
3708                         yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
3709
3710                         memcpy(oldName, oh->name, sizeof(oh->name));
3711                 }
3712
3713                 memset(buffer, 0xFF, dev->nDataBytesPerChunk);
3714
3715                 oh->type = in->variantType;
3716                 oh->yst_mode = in->yst_mode;
3717                 oh->shadowsObject = oh->inbandShadowsObject = shadows;
3718
3719 #ifdef CONFIG_YAFFS_WINCE
3720                 oh->win_atime[0] = in->win_atime[0];
3721                 oh->win_ctime[0] = in->win_ctime[0];
3722                 oh->win_mtime[0] = in->win_mtime[0];
3723                 oh->win_atime[1] = in->win_atime[1];
3724                 oh->win_ctime[1] = in->win_ctime[1];
3725                 oh->win_mtime[1] = in->win_mtime[1];
3726 #else
3727                 oh->yst_uid = in->yst_uid;
3728                 oh->yst_gid = in->yst_gid;
3729                 oh->yst_atime = in->yst_atime;
3730                 oh->yst_mtime = in->yst_mtime;
3731                 oh->yst_ctime = in->yst_ctime;
3732                 oh->yst_rdev = in->yst_rdev;
3733 #endif
3734                 if (in->parent)
3735                         oh->parentObjectId = in->parent->objectId;
3736                 else
3737                         oh->parentObjectId = 0;
3738
3739                 if (name && *name) {
3740                         memset(oh->name, 0, sizeof(oh->name));
3741                         yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
3742                 } else if (prevChunkId > 0)
3743                         memcpy(oh->name, oldName, sizeof(oh->name));
3744                 else
3745                         memset(oh->name, 0, sizeof(oh->name));
3746
3747                 oh->isShrink = isShrink;
3748
3749                 switch (in->variantType) {
3750                 case YAFFS_OBJECT_TYPE_UNKNOWN:
3751                         /* Should not happen */
3752                         break;
3753                 case YAFFS_OBJECT_TYPE_FILE:
3754                         oh->fileSize =
3755                             (oh->parentObjectId == YAFFS_OBJECTID_DELETED
3756                              || oh->parentObjectId ==
3757                              YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
3758                             fileVariant.fileSize;
3759                         break;
3760                 case YAFFS_OBJECT_TYPE_HARDLINK:
3761                         oh->equivalentObjectId =
3762                             in->variant.hardLinkVariant.equivalentObjectId;
3763                         break;
3764                 case YAFFS_OBJECT_TYPE_SPECIAL:
3765                         /* Do nothing */
3766                         break;
3767                 case YAFFS_OBJECT_TYPE_DIRECTORY:
3768                         /* Do nothing */
3769                         break;
3770                 case YAFFS_OBJECT_TYPE_SYMLINK:
3771                         yaffs_strncpy(oh->alias,
3772                                       in->variant.symLinkVariant.alias,
3773                                       YAFFS_MAX_ALIAS_LENGTH);
3774                         oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3775                         break;
3776                 }
3777
3778                 /* Tags */
3779                 yaffs_InitialiseTags(&newTags);
3780                 in->serial++;
3781                 newTags.chunkId = 0;
3782                 newTags.objectId = in->objectId;
3783                 newTags.serialNumber = in->serial;
3784
3785                 /* Add extra info for file header */
3786
3787                 newTags.extraHeaderInfoAvailable = 1;
3788                 newTags.extraParentObjectId = oh->parentObjectId;
3789                 newTags.extraFileLength = oh->fileSize;
3790                 newTags.extraIsShrinkHeader = oh->isShrink;
3791                 newTags.extraEquivalentObjectId = oh->equivalentObjectId;
3792                 newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
3793                 newTags.extraObjectType = in->variantType;
3794
3795                 yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
3796
3797                 /* Create new chunk in NAND */
3798                 newChunkId =
3799                     yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
3800                                                       (prevChunkId > 0) ? 1 : 0);
3801
3802                 if (newChunkId >= 0) {
3803
3804                         in->hdrChunk = newChunkId;
3805
3806                         if (prevChunkId > 0) {
3807                                 yaffs_DeleteChunk(dev, prevChunkId, 1,
3808                                                   __LINE__);
3809                         }
3810
3811                         if (!yaffs_ObjectHasCachedWriteData(in))
3812                                 in->dirty = 0;
3813
3814                         /* If this was a shrink, then mark the block that the chunk lives on */
3815                         if (isShrink) {
3816                                 bi = yaffs_GetBlockInfo(in->myDev,
3817                                         newChunkId / in->myDev->nChunksPerBlock);
3818                                 bi->hasShrinkHeader = 1;
3819                         }
3820
3821                 }
3822
3823                 retVal = newChunkId;
3824
3825         }
3826
3827         if (buffer)
3828                 yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
3829
3830         return retVal;
3831 }
3832
3833 /*------------------------ Short Operations Cache ----------------------------------------
3834  *   In many situations where there is no high level buffering (eg WinCE) a lot of
3835  *   reads might be short sequential reads, and a lot of writes may be short
3836  *   sequential writes. eg. scanning/writing a jpeg file.
3837  *   In these cases, a short read/write cache can provide a huge perfomance benefit
3838  *   with dumb-as-a-rock code.
3839  *   In Linux, the page cache provides read buffering aand the short op cache provides write
3840  *   buffering.
3841  *
3842  *   There are a limited number (~10) of cache chunks per device so that we don't
3843  *   need a very intelligent search.
3844  */
3845
3846 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
3847 {
3848         yaffs_Device *dev = obj->myDev;
3849         int i;
3850         yaffs_ChunkCache *cache;
3851         int nCaches = obj->myDev->nShortOpCaches;
3852
3853         for (i = 0; i < nCaches; i++) {
3854                 cache = &dev->srCache[i];
3855                 if (cache->object == obj &&
3856                     cache->dirty)
3857                         return 1;
3858         }
3859
3860         return 0;
3861 }
3862
3863
3864 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
3865 {
3866         yaffs_Device *dev = obj->myDev;
3867         int lowest = -99;       /* Stop compiler whining. */
3868         int i;
3869         yaffs_ChunkCache *cache;
3870         int chunkWritten = 0;
3871         int nCaches = obj->myDev->nShortOpCaches;
3872
3873         if (nCaches > 0) {
3874                 do {
3875                         cache = NULL;
3876
3877                         /* Find the dirty cache for this object with the lowest chunk id. */
3878                         for (i = 0; i < nCaches; i++) {
3879                                 if (dev->srCache[i].object == obj &&
3880                                     dev->srCache[i].dirty) {
3881                                         if (!cache
3882                                             || dev->srCache[i].chunkId <
3883                                             lowest) {
3884                                                 cache = &dev->srCache[i];
3885                                                 lowest = cache->chunkId;
3886                                         }
3887                                 }
3888                         }
3889
3890                         if (cache && !cache->locked) {
3891                                 /* Write it out and free it up */
3892
3893                                 chunkWritten =
3894                                     yaffs_WriteChunkDataToObject(cache->object,
3895                                                                  cache->chunkId,
3896                                                                  cache->data,
3897                                                                  cache->nBytes,
3898                                                                  1);
3899                                 cache->dirty = 0;
3900                                 cache->object = NULL;
3901                         }
3902
3903                 } while (cache && chunkWritten > 0);
3904
3905                 if (cache) {
3906                         /* Hoosterman, disk full while writing cache out. */
3907                         T(YAFFS_TRACE_ERROR,
3908                           (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3909
3910                 }
3911         }
3912
3913 }
3914
3915 /*yaffs_FlushEntireDeviceCache(dev)
3916  *
3917  *
3918  */
3919
3920 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
3921 {
3922         yaffs_Object *obj;
3923         int nCaches = dev->nShortOpCaches;
3924         int i;
3925
3926         /* Find a dirty object in the cache and flush it...
3927          * until there are no further dirty objects.
3928          */
3929         do {
3930                 obj = NULL;
3931                 for (i = 0; i < nCaches && !obj; i++) {
3932                         if (dev->srCache[i].object &&
3933                             dev->srCache[i].dirty)
3934                                 obj = dev->srCache[i].object;
3935
3936                 }
3937                 if (obj)
3938                         yaffs_FlushFilesChunkCache(obj);
3939
3940         } while (obj);
3941
3942 }
3943
3944
3945 /* Grab us a cache chunk for use.
3946  * First look for an empty one.
3947  * Then look for the least recently used non-dirty one.
3948  * Then look for the least recently used dirty one...., flush and look again.
3949  */
3950 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
3951 {
3952         int i;
3953
3954         if (dev->nShortOpCaches > 0) {
3955                 for (i = 0; i < dev->nShortOpCaches; i++) {
3956                         if (!dev->srCache[i].object)
3957                                 return &dev->srCache[i];
3958                 }
3959         }
3960
3961         return NULL;
3962 }
3963
3964 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
3965 {
3966         yaffs_ChunkCache *cache;
3967         yaffs_Object *theObj;
3968         int usage;
3969         int i;
3970         int pushout;
3971
3972         if (dev->nShortOpCaches > 0) {
3973                 /* Try find a non-dirty one... */
3974
3975                 cache = yaffs_GrabChunkCacheWorker(dev);
3976
3977                 if (!cache) {
3978                         /* They were all dirty, find the last recently used object and flush
3979                          * its cache, then  find again.
3980                          * NB what's here is not very accurate, we actually flush the object
3981                          * the last recently used page.
3982                          */
3983
3984                         /* With locking we can't assume we can use entry zero */
3985
3986                         theObj = NULL;
3987                         usage = -1;
3988                         cache = NULL;
3989                         pushout = -1;
3990
3991                         for (i = 0; i < dev->nShortOpCaches; i++) {
3992                                 if (dev->srCache[i].object &&
3993                                     !dev->srCache[i].locked &&
3994                                     (dev->srCache[i].lastUse < usage || !cache)) {
3995                                         usage = dev->srCache[i].lastUse;
3996                                         theObj = dev->srCache[i].object;
3997                                         cache = &dev->srCache[i];
3998                                         pushout = i;
3999                                 }
4000                         }
4001
4002                         if (!cache || cache->dirty) {
4003                                 /* Flush and try again */
4004                                 yaffs_FlushFilesChunkCache(theObj);
4005                                 cache = yaffs_GrabChunkCacheWorker(dev);
4006                         }
4007
4008                 }
4009                 return cache;
4010         } else
4011                 return NULL;
4012
4013 }
4014
4015 /* Find a cached chunk */
4016 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
4017                                               int chunkId)
4018 {
4019         yaffs_Device *dev = obj->myDev;
4020         int i;
4021         if (dev->nShortOpCaches > 0) {
4022                 for (i = 0; i < dev->nShortOpCaches; i++) {
4023                         if (dev->srCache[i].object == obj &&
4024                             dev->srCache[i].chunkId == chunkId) {
4025                                 dev->cacheHits++;
4026
4027                                 return &dev->srCache[i];
4028                         }
4029                 }
4030         }
4031         return NULL;
4032 }
4033
4034 /* Mark the chunk for the least recently used algorithym */
4035 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
4036                                 int isAWrite)
4037 {
4038
4039         if (dev->nShortOpCaches > 0) {
4040                 if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
4041                         /* Reset the cache usages */
4042                         int i;
4043                         for (i = 1; i < dev->nShortOpCaches; i++)
4044                                 dev->srCache[i].lastUse = 0;
4045
4046                         dev->srLastUse = 0;
4047                 }
4048
4049                 dev->srLastUse++;
4050
4051                 cache->lastUse = dev->srLastUse;
4052
4053                 if (isAWrite)
4054                         cache->dirty = 1;
4055         }
4056 }
4057
4058 /* Invalidate a single cache page.
4059  * Do this when a whole page gets written,
4060  * ie the short cache for this page is no longer valid.
4061  */
4062 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
4063 {
4064         if (object->myDev->nShortOpCaches > 0) {
4065                 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
4066
4067                 if (cache)
4068                         cache->object = NULL;
4069         }
4070 }
4071
4072 /* Invalidate all the cache pages associated with this object
4073  * Do this whenever ther file is deleted or resized.
4074  */
4075 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
4076 {
4077         int i;
4078         yaffs_Device *dev = in->myDev;
4079
4080         if (dev->nShortOpCaches > 0) {
4081                 /* Invalidate it. */
4082                 for (i = 0; i < dev->nShortOpCaches; i++) {
4083                         if (dev->srCache[i].object == in)
4084                                 dev->srCache[i].object = NULL;
4085                 }
4086         }
4087 }
4088
4089 /*--------------------- Checkpointing --------------------*/
4090
4091
4092 static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
4093 {
4094         yaffs_CheckpointValidity cp;
4095
4096         memset(&cp, 0, sizeof(cp));
4097
4098         cp.structType = sizeof(cp);
4099         cp.magic = YAFFS_MAGIC;
4100         cp.version = YAFFS_CHECKPOINT_VERSION;
4101         cp.head = (head) ? 1 : 0;
4102
4103         return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
4104                 1 : 0;
4105 }
4106
4107 static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
4108 {
4109         yaffs_CheckpointValidity cp;
4110         int ok;
4111
4112         ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4113
4114         if (ok)
4115                 ok = (cp.structType == sizeof(cp)) &&
4116                      (cp.magic == YAFFS_MAGIC) &&
4117                      (cp.version == YAFFS_CHECKPOINT_VERSION) &&
4118                      (cp.head == ((head) ? 1 : 0));
4119         return ok ? 1 : 0;
4120 }
4121
4122 static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
4123                                            yaffs_Device *dev)
4124 {
4125         cp->nErasedBlocks = dev->nErasedBlocks;
4126         cp->allocationBlock = dev->allocationBlock;
4127         cp->allocationPage = dev->allocationPage;
4128         cp->nFreeChunks = dev->nFreeChunks;
4129
4130         cp->nDeletedFiles = dev->nDeletedFiles;
4131         cp->nUnlinkedFiles = dev->nUnlinkedFiles;
4132         cp->nBackgroundDeletions = dev->nBackgroundDeletions;
4133         cp->sequenceNumber = dev->sequenceNumber;
4134         cp->oldestDirtySequence = dev->oldestDirtySequence;
4135
4136 }
4137
4138 static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
4139                                            yaffs_CheckpointDevice *cp)
4140 {
4141         dev->nErasedBlocks = cp->nErasedBlocks;
4142         dev->allocationBlock = cp->allocationBlock;
4143         dev->allocationPage = cp->allocationPage;
4144         dev->nFreeChunks = cp->nFreeChunks;
4145
4146         dev->nDeletedFiles = cp->nDeletedFiles;
4147         dev->nUnlinkedFiles = cp->nUnlinkedFiles;
4148         dev->nBackgroundDeletions = cp->nBackgroundDeletions;
4149         dev->sequenceNumber = cp->sequenceNumber;
4150         dev->oldestDirtySequence = cp->oldestDirtySequence;
4151 }
4152
4153
4154 static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
4155 {
4156         yaffs_CheckpointDevice cp;
4157         __u32 nBytes;
4158         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4159
4160         int ok;
4161
4162         /* Write device runtime values*/
4163         yaffs_DeviceToCheckpointDevice(&cp, dev);
4164         cp.structType = sizeof(cp);
4165
4166         ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4167
4168         /* Write block info */
4169         if (ok) {
4170                 nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4171                 ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
4172         }
4173
4174         /* Write chunk bits */
4175         if (ok) {
4176                 nBytes = nBlocks * dev->chunkBitmapStride;
4177                 ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
4178         }
4179         return   ok ? 1 : 0;
4180
4181 }
4182
4183 static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
4184 {
4185         yaffs_CheckpointDevice cp;
4186         __u32 nBytes;
4187         __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
4188
4189         int ok;
4190
4191         ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4192         if (!ok)
4193                 return 0;
4194
4195         if (cp.structType != sizeof(cp))
4196                 return 0;
4197
4198
4199         yaffs_CheckpointDeviceToDevice(dev, &cp);
4200
4201         nBytes = nBlocks * sizeof(yaffs_BlockInfo);
4202
4203         ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
4204
4205         if (!ok)
4206                 return 0;
4207         nBytes = nBlocks * dev->chunkBitmapStride;
4208
4209         ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
4210
4211         return ok ? 1 : 0;
4212 }
4213
4214 static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
4215                                            yaffs_Object *obj)
4216 {
4217
4218         cp->objectId = obj->objectId;
4219         cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
4220         cp->hdrChunk = obj->hdrChunk;
4221         cp->variantType = obj->variantType;
4222         cp->deleted = obj->deleted;
4223         cp->softDeleted = obj->softDeleted;
4224         cp->unlinked = obj->unlinked;
4225         cp->fake = obj->fake;
4226         cp->renameAllowed = obj->renameAllowed;
4227         cp->unlinkAllowed = obj->unlinkAllowed;
4228         cp->serial = obj->serial;
4229         cp->nDataChunks = obj->nDataChunks;
4230
4231         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4232                 cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
4233         else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4234                 cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
4235 }
4236
4237 static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
4238 {
4239
4240         yaffs_Object *parent;
4241
4242         if (obj->variantType != cp->variantType) {
4243                 T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
4244                         TCONT("chunk %d does not match existing object type %d")
4245                         TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
4246                         obj->variantType));
4247                 return 0;
4248         }
4249
4250         obj->objectId = cp->objectId;
4251
4252         if (cp->parentId)
4253                 parent = yaffs_FindOrCreateObjectByNumber(
4254                                         obj->myDev,
4255                                         cp->parentId,
4256                                         YAFFS_OBJECT_TYPE_DIRECTORY);
4257         else
4258                 parent = NULL;
4259
4260         if (parent) {
4261                 if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
4262                         T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
4263                                 TCONT(" chunk %d Parent type, %d, not directory")
4264                                 TENDSTR),
4265                                 cp->objectId, cp->parentId, cp->variantType,
4266                                 cp->hdrChunk, parent->variantType));
4267                         return 0;
4268                 }
4269                 yaffs_AddObjectToDirectory(parent, obj);
4270         }
4271
4272         obj->hdrChunk = cp->hdrChunk;
4273         obj->variantType = cp->variantType;
4274         obj->deleted = cp->deleted;
4275         obj->softDeleted = cp->softDeleted;
4276         obj->unlinked = cp->unlinked;
4277         obj->fake = cp->fake;
4278         obj->renameAllowed = cp->renameAllowed;
4279         obj->unlinkAllowed = cp->unlinkAllowed;
4280         obj->serial = cp->serial;
4281         obj->nDataChunks = cp->nDataChunks;
4282
4283         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4284                 obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
4285         else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4286                 obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
4287
4288         if (obj->hdrChunk > 0)
4289                 obj->lazyLoaded = 1;
4290         return 1;
4291 }
4292
4293
4294
4295 static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
4296                                         __u32 level, int chunkOffset)
4297 {
4298         int i;
4299         yaffs_Device *dev = in->myDev;
4300         int ok = 1;
4301         int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4302
4303         if (tnodeSize < sizeof(yaffs_Tnode))
4304                 tnodeSize = sizeof(yaffs_Tnode);
4305
4306
4307         if (tn) {
4308                 if (level > 0) {
4309
4310                         for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
4311                                 if (tn->internal[i]) {
4312                                         ok = yaffs_CheckpointTnodeWorker(in,
4313                                                         tn->internal[i],
4314                                                         level - 1,
4315                                                         (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
4316                                 }
4317                         }
4318                 } else if (level == 0) {
4319                         __u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
4320                         ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
4321                         if (ok)
4322                                 ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
4323                 }
4324         }
4325
4326         return ok;
4327
4328 }
4329
4330 static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
4331 {
4332         __u32 endMarker = ~0;
4333         int ok = 1;
4334
4335         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4336                 ok = yaffs_CheckpointTnodeWorker(obj,
4337                                             obj->variant.fileVariant.top,
4338                                             obj->variant.fileVariant.topLevel,
4339                                             0);
4340                 if (ok)
4341                         ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
4342                                 sizeof(endMarker));
4343         }
4344
4345         return ok ? 1 : 0;
4346 }
4347
4348 static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
4349 {
4350         __u32 baseChunk;
4351         int ok = 1;
4352         yaffs_Device *dev = obj->myDev;
4353         yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
4354         yaffs_Tnode *tn;
4355         int nread = 0;
4356         int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
4357
4358         if (tnodeSize < sizeof(yaffs_Tnode))
4359                 tnodeSize = sizeof(yaffs_Tnode);
4360
4361         ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4362
4363         while (ok && (~baseChunk)) {
4364                 nread++;
4365                 /* Read level 0 tnode */
4366
4367
4368                 tn = yaffs_GetTnodeRaw(dev);
4369                 if (tn)
4370                         ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
4371                 else
4372                         ok = 0;
4373
4374                 if (tn && ok)
4375                         ok = yaffs_AddOrFindLevel0Tnode(dev,
4376                                                         fileStructPtr,
4377                                                         baseChunk,
4378                                                         tn) ? 1 : 0;
4379
4380                 if (ok)
4381                         ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
4382
4383         }
4384
4385         T(YAFFS_TRACE_CHECKPOINT, (
4386                 TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
4387                 nread, baseChunk, ok));
4388
4389         return ok ? 1 : 0;
4390 }
4391
4392
4393 static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
4394 {
4395         yaffs_Object *obj;
4396         yaffs_CheckpointObject cp;
4397         int i;
4398         int ok = 1;
4399         struct ylist_head *lh;
4400
4401
4402         /* Iterate through the objects in each hash entry,
4403          * dumping them to the checkpointing stream.
4404          */
4405
4406         for (i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++) {
4407                 ylist_for_each(lh, &dev->objectBucket[i].list) {
4408                         if (lh) {
4409                                 obj = ylist_entry(lh, yaffs_Object, hashLink);
4410                                 if (!obj->deferedFree) {
4411                                         yaffs_ObjectToCheckpointObject(&cp, obj);
4412                                         cp.structType = sizeof(cp);
4413
4414                                         T(YAFFS_TRACE_CHECKPOINT, (
4415                                                 TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
4416                                                 cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, (unsigned) obj));
4417
4418                                         ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4419
4420                                         if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4421                                                 ok = yaffs_WriteCheckpointTnodes(obj);
4422                                 }
4423                         }
4424                 }
4425         }
4426
4427         /* Dump end of list */
4428         memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
4429         cp.structType = sizeof(cp);
4430
4431         if (ok)
4432                 ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
4433
4434         return ok ? 1 : 0;
4435 }
4436
4437 static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
4438 {
4439         yaffs_Object *obj;
4440         yaffs_CheckpointObject cp;
4441         int ok = 1;
4442         int done = 0;
4443         yaffs_Object *hardList = NULL;
4444
4445         while (ok && !done) {
4446                 ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
4447                 if (cp.structType != sizeof(cp)) {
4448                         T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
4449                                 cp.structType, sizeof(cp), ok));
4450                         ok = 0;
4451                 }
4452
4453                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
4454                         cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
4455
4456                 if (ok && cp.objectId == ~0)
4457                         done = 1;
4458                 else if (ok) {
4459                         obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
4460                         if (obj) {
4461                                 ok = yaffs_CheckpointObjectToObject(obj, &cp);
4462                                 if (!ok)
4463                                         break;
4464                                 if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
4465                                         ok = yaffs_ReadCheckpointTnodes(obj);
4466                                 } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
4467                                         obj->hardLinks.next =
4468                                                 (struct ylist_head *) hardList;
4469                                         hardList = obj;
4470                                 }
4471                         } else
4472                                 ok = 0;
4473                 }
4474         }
4475
4476         if (ok)
4477                 yaffs_HardlinkFixup(dev, hardList);
4478
4479         return ok ? 1 : 0;
4480 }
4481
4482 static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
4483 {
4484         __u32 checkpointSum;
4485         int ok;
4486
4487         yaffs_GetCheckpointSum(dev, &checkpointSum);
4488
4489         ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
4490
4491         if (!ok)
4492                 return 0;
4493
4494         return 1;
4495 }
4496
4497 static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
4498 {
4499         __u32 checkpointSum0;
4500         __u32 checkpointSum1;
4501         int ok;
4502
4503         yaffs_GetCheckpointSum(dev, &checkpointSum0);
4504
4505         ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
4506
4507         if (!ok)
4508                 return 0;
4509
4510         if (checkpointSum0 != checkpointSum1)
4511                 return 0;
4512
4513         return 1;
4514 }
4515
4516
4517 static int yaffs_WriteCheckpointData(yaffs_Device *dev)
4518 {
4519         int ok = 1;
4520
4521         if (dev->skipCheckpointWrite || !dev->isYaffs2) {
4522                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
4523                 ok = 0;
4524         }
4525
4526         if (ok)
4527                 ok = yaffs_CheckpointOpen(dev, 1);
4528
4529         if (ok) {
4530                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4531                 ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
4532         }
4533         if (ok) {
4534                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
4535                 ok = yaffs_WriteCheckpointDevice(dev);
4536         }
4537         if (ok) {
4538                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
4539                 ok = yaffs_WriteCheckpointObjects(dev);
4540         }
4541         if (ok) {
4542                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
4543                 ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
4544         }
4545
4546         if (ok)
4547                 ok = yaffs_WriteCheckpointSum(dev);
4548
4549         if (!yaffs_CheckpointClose(dev))
4550                 ok = 0;
4551
4552         if (ok)
4553                 dev->isCheckpointed = 1;
4554         else
4555                 dev->isCheckpointed = 0;
4556
4557         return dev->isCheckpointed;
4558 }
4559
4560 static int yaffs_ReadCheckpointData(yaffs_Device *dev)
4561 {
4562         int ok = 1;
4563
4564         if (dev->skipCheckpointRead || !dev->isYaffs2) {
4565                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
4566                 ok = 0;
4567         }
4568
4569         if (ok)
4570                 ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
4571
4572         if (ok) {
4573                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4574                 ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
4575         }
4576         if (ok) {
4577                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
4578                 ok = yaffs_ReadCheckpointDevice(dev);
4579         }
4580         if (ok) {
4581                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
4582                 ok = yaffs_ReadCheckpointObjects(dev);
4583         }
4584         if (ok) {
4585                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
4586                 ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
4587         }
4588
4589         if (ok) {
4590                 ok = yaffs_ReadCheckpointSum(dev);
4591                 T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
4592         }
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 ok ? 1 : 0;
4603
4604 }
4605
4606 static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
4607 {
4608         if (dev->isCheckpointed ||
4609                         dev->blocksInCheckpoint > 0) {
4610                 dev->isCheckpointed = 0;
4611                 yaffs_CheckpointInvalidateStream(dev);
4612                 if (dev->superBlock && dev->markSuperBlockDirty)
4613                         dev->markSuperBlockDirty(dev->superBlock);
4614         }
4615 }
4616
4617
4618 int yaffs_CheckpointSave(yaffs_Device *dev)
4619 {
4620
4621         T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4622
4623         yaffs_VerifyObjects(dev);
4624         yaffs_VerifyBlocks(dev);
4625         yaffs_VerifyFreeChunks(dev);
4626
4627         if (!dev->isCheckpointed) {
4628                 yaffs_InvalidateCheckpoint(dev);
4629                 yaffs_WriteCheckpointData(dev);
4630         }
4631
4632         T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4633
4634         return dev->isCheckpointed;
4635 }
4636
4637 int yaffs_CheckpointRestore(yaffs_Device *dev)
4638 {
4639         int retval;
4640         T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4641
4642         retval = yaffs_ReadCheckpointData(dev);
4643
4644         if (dev->isCheckpointed) {
4645                 yaffs_VerifyObjects(dev);
4646                 yaffs_VerifyBlocks(dev);
4647                 yaffs_VerifyFreeChunks(dev);
4648         }
4649
4650         T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
4651
4652         return retval;
4653 }
4654
4655 /*--------------------- File read/write ------------------------
4656  * Read and write have very similar structures.
4657  * In general the read/write has three parts to it
4658  * An incomplete chunk to start with (if the read/write is not chunk-aligned)
4659  * Some complete chunks
4660  * An incomplete chunk to end off with
4661  *
4662  * Curve-balls: the first chunk might also be the last chunk.
4663  */
4664
4665 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
4666                         int nBytes)
4667 {
4668
4669         int chunk;
4670         __u32 start;
4671         int nToCopy;
4672         int n = nBytes;
4673         int nDone = 0;
4674         yaffs_ChunkCache *cache;
4675
4676         yaffs_Device *dev;
4677
4678         dev = in->myDev;
4679
4680         while (n > 0) {
4681                 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4682                 /* start = offset % dev->nDataBytesPerChunk; */
4683                 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4684                 chunk++;
4685
4686                 /* OK now check for the curveball where the start and end are in
4687                  * the same chunk.
4688                  */
4689                 if ((start + n) < dev->nDataBytesPerChunk)
4690                         nToCopy = n;
4691                 else
4692                         nToCopy = dev->nDataBytesPerChunk - start;
4693
4694                 cache = yaffs_FindChunkCache(in, chunk);
4695
4696                 /* If the chunk is already in the cache or it is less than a whole chunk
4697                  * or we're using inband tags then use the cache (if there is caching)
4698                  * else bypass the cache.
4699                  */
4700                 if (cache || nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4701                         if (dev->nShortOpCaches > 0) {
4702
4703                                 /* If we can't find the data in the cache, then load it up. */
4704
4705                                 if (!cache) {
4706                                         cache = yaffs_GrabChunkCache(in->myDev);
4707                                         cache->object = in;
4708                                         cache->chunkId = chunk;
4709                                         cache->dirty = 0;
4710                                         cache->locked = 0;
4711                                         yaffs_ReadChunkDataFromObject(in, chunk,
4712                                                                       cache->
4713                                                                       data);
4714                                         cache->nBytes = 0;
4715                                 }
4716
4717                                 yaffs_UseChunkCache(dev, cache, 0);
4718
4719                                 cache->locked = 1;
4720
4721
4722                                 memcpy(buffer, &cache->data[start], nToCopy);
4723
4724                                 cache->locked = 0;
4725                         } else {
4726                                 /* Read into the local buffer then copy..*/
4727
4728                                 __u8 *localBuffer =
4729                                     yaffs_GetTempBuffer(dev, __LINE__);
4730                                 yaffs_ReadChunkDataFromObject(in, chunk,
4731                                                               localBuffer);
4732
4733                                 memcpy(buffer, &localBuffer[start], nToCopy);
4734
4735
4736                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
4737                                                         __LINE__);
4738                         }
4739
4740                 } else {
4741
4742                         /* A full chunk. Read directly into the supplied buffer. */
4743                         yaffs_ReadChunkDataFromObject(in, chunk, buffer);
4744
4745                 }
4746
4747                 n -= nToCopy;
4748                 offset += nToCopy;
4749                 buffer += nToCopy;
4750                 nDone += nToCopy;
4751
4752         }
4753
4754         return nDone;
4755 }
4756
4757 int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
4758                         int nBytes, int writeThrough)
4759 {
4760
4761         int chunk;
4762         __u32 start;
4763         int nToCopy;
4764         int n = nBytes;
4765         int nDone = 0;
4766         int nToWriteBack;
4767         int startOfWrite = offset;
4768         int chunkWritten = 0;
4769         __u32 nBytesRead;
4770         __u32 chunkStart;
4771
4772         yaffs_Device *dev;
4773
4774         dev = in->myDev;
4775
4776         while (n > 0 && chunkWritten >= 0) {
4777                 /* chunk = offset / dev->nDataBytesPerChunk + 1; */
4778                 /* start = offset % dev->nDataBytesPerChunk; */
4779                 yaffs_AddrToChunk(dev, offset, &chunk, &start);
4780
4781                 if (chunk * dev->nDataBytesPerChunk + start != offset ||
4782                                 start >= dev->nDataBytesPerChunk) {
4783                         T(YAFFS_TRACE_ERROR, (
4784                            TSTR("AddrToChunk of offset %d gives chunk %d start %d"
4785                            TENDSTR),
4786                            (int)offset, chunk, start));
4787                 }
4788                 chunk++;
4789
4790                 /* OK now check for the curveball where the start and end are in
4791                  * the same chunk.
4792                  */
4793
4794                 if ((start + n) < dev->nDataBytesPerChunk) {
4795                         nToCopy = n;
4796
4797                         /* Now folks, to calculate how many bytes to write back....
4798                          * If we're overwriting and not writing to then end of file then
4799                          * we need to write back as much as was there before.
4800                          */
4801
4802                         chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
4803
4804                         if (chunkStart > in->variant.fileVariant.fileSize)
4805                                 nBytesRead = 0; /* Past end of file */
4806                         else
4807                                 nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
4808
4809                         if (nBytesRead > dev->nDataBytesPerChunk)
4810                                 nBytesRead = dev->nDataBytesPerChunk;
4811
4812                         nToWriteBack =
4813                             (nBytesRead >
4814                              (start + n)) ? nBytesRead : (start + n);
4815
4816                         if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
4817                                 YBUG();
4818
4819                 } else {
4820                         nToCopy = dev->nDataBytesPerChunk - start;
4821                         nToWriteBack = dev->nDataBytesPerChunk;
4822                 }
4823
4824                 if (nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
4825                         /* An incomplete start or end chunk (or maybe both start and end chunk),
4826                          * or we're using inband tags, so we want to use the cache buffers.
4827                          */
4828                         if (dev->nShortOpCaches > 0) {
4829                                 yaffs_ChunkCache *cache;
4830                                 /* If we can't find the data in the cache, then load the cache */
4831                                 cache = yaffs_FindChunkCache(in, chunk);
4832
4833                                 if (!cache
4834                                     && yaffs_CheckSpaceForAllocation(in->
4835                                                                      myDev)) {
4836                                         cache = yaffs_GrabChunkCache(in->myDev);
4837                                         cache->object = in;
4838                                         cache->chunkId = chunk;
4839                                         cache->dirty = 0;
4840                                         cache->locked = 0;
4841                                         yaffs_ReadChunkDataFromObject(in, chunk,
4842                                                                       cache->
4843                                                                       data);
4844                                 } else if (cache &&
4845                                         !cache->dirty &&
4846                                         !yaffs_CheckSpaceForAllocation(in->myDev)) {
4847                                         /* Drop the cache if it was a read cache item and
4848                                          * no space check has been made for it.
4849                                          */
4850                                          cache = NULL;
4851                                 }
4852
4853                                 if (cache) {
4854                                         yaffs_UseChunkCache(dev, cache, 1);
4855                                         cache->locked = 1;
4856
4857
4858                                         memcpy(&cache->data[start], buffer,
4859                                                nToCopy);
4860
4861
4862                                         cache->locked = 0;
4863                                         cache->nBytes = nToWriteBack;
4864
4865                                         if (writeThrough) {
4866                                                 chunkWritten =
4867                                                     yaffs_WriteChunkDataToObject
4868                                                     (cache->object,
4869                                                      cache->chunkId,
4870                                                      cache->data, cache->nBytes,
4871                                                      1);
4872                                                 cache->dirty = 0;
4873                                         }
4874
4875                                 } else {
4876                                         chunkWritten = -1;      /* fail the write */
4877                                 }
4878                         } else {
4879                                 /* An incomplete start or end chunk (or maybe both start and end chunk)
4880                                  * Read into the local buffer then copy, then copy over and write back.
4881                                  */
4882
4883                                 __u8 *localBuffer =
4884                                     yaffs_GetTempBuffer(dev, __LINE__);
4885
4886                                 yaffs_ReadChunkDataFromObject(in, chunk,
4887                                                               localBuffer);
4888
4889
4890
4891                                 memcpy(&localBuffer[start], buffer, nToCopy);
4892
4893                                 chunkWritten =
4894                                     yaffs_WriteChunkDataToObject(in, chunk,
4895                                                                  localBuffer,
4896                                                                  nToWriteBack,
4897                                                                  0);
4898
4899                                 yaffs_ReleaseTempBuffer(dev, localBuffer,
4900                                                         __LINE__);
4901
4902                         }
4903
4904                 } else {
4905                         /* A full chunk. Write directly from the supplied buffer. */
4906
4907
4908
4909                         chunkWritten =
4910                             yaffs_WriteChunkDataToObject(in, chunk, buffer,
4911                                                          dev->nDataBytesPerChunk,
4912                                                          0);
4913
4914                         /* Since we've overwritten the cached data, we better invalidate it. */
4915                         yaffs_InvalidateChunkCache(in, chunk);
4916                 }
4917
4918                 if (chunkWritten >= 0) {
4919                         n -= nToCopy;
4920                         offset += nToCopy;
4921                         buffer += nToCopy;
4922                         nDone += nToCopy;
4923                 }
4924
4925         }
4926
4927         /* Update file object */
4928
4929         if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
4930                 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
4931
4932         in->dirty = 1;
4933
4934         return nDone;
4935 }
4936
4937
4938 /* ---------------------- File resizing stuff ------------------ */
4939
4940 static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
4941 {
4942
4943         yaffs_Device *dev = in->myDev;
4944         int oldFileSize = in->variant.fileVariant.fileSize;
4945
4946         int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
4947
4948         int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
4949             dev->nDataBytesPerChunk;
4950         int i;
4951         int chunkId;
4952
4953         /* Delete backwards so that we don't end up with holes if
4954          * power is lost part-way through the operation.
4955          */
4956         for (i = lastDel; i >= startDel; i--) {
4957                 /* NB this could be optimised somewhat,
4958                  * eg. could retrieve the tags and write them without
4959                  * using yaffs_DeleteChunk
4960                  */
4961
4962                 chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
4963                 if (chunkId > 0) {
4964                         if (chunkId <
4965                             (dev->internalStartBlock * dev->nChunksPerBlock)
4966                             || chunkId >=
4967                             ((dev->internalEndBlock +
4968                               1) * dev->nChunksPerBlock)) {
4969                                 T(YAFFS_TRACE_ALWAYS,
4970                                   (TSTR("Found daft chunkId %d for %d" TENDSTR),
4971                                    chunkId, i));
4972                         } else {
4973                                 in->nDataChunks--;
4974                                 yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
4975                         }
4976                 }
4977         }
4978
4979 }
4980
4981 int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
4982 {
4983
4984         int oldFileSize = in->variant.fileVariant.fileSize;
4985         __u32 newSizeOfPartialChunk;
4986         int newFullChunks;
4987
4988         yaffs_Device *dev = in->myDev;
4989
4990         yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
4991
4992         yaffs_FlushFilesChunkCache(in);
4993         yaffs_InvalidateWholeChunkCache(in);
4994
4995         yaffs_CheckGarbageCollection(dev);
4996
4997         if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
4998                 return YAFFS_FAIL;
4999
5000         if (newSize == oldFileSize)
5001                 return YAFFS_OK;
5002
5003         if (newSize < oldFileSize) {
5004
5005                 yaffs_PruneResizedChunks(in, newSize);
5006
5007                 if (newSizeOfPartialChunk != 0) {
5008                         int lastChunk = 1 + newFullChunks;
5009
5010                         __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
5011
5012                         /* Got to read and rewrite the last chunk with its new size and zero pad */
5013                         yaffs_ReadChunkDataFromObject(in, lastChunk,
5014                                                       localBuffer);
5015
5016                         memset(localBuffer + newSizeOfPartialChunk, 0,
5017                                dev->nDataBytesPerChunk - newSizeOfPartialChunk);
5018
5019                         yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
5020                                                      newSizeOfPartialChunk, 1);
5021
5022                         yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
5023                 }
5024
5025                 in->variant.fileVariant.fileSize = newSize;
5026
5027                 yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
5028         } else {
5029                 /* newsSize > oldFileSize */
5030                 in->variant.fileVariant.fileSize = newSize;
5031         }
5032
5033
5034         /* Write a new object header.
5035          * show we've shrunk the file, if need be
5036          * Do this only if the file is not in the deleted directories.
5037          */
5038         if (in->parent &&
5039             in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
5040             in->parent->objectId != YAFFS_OBJECTID_DELETED)
5041                 yaffs_UpdateObjectHeader(in, NULL, 0,
5042                                          (newSize < oldFileSize) ? 1 : 0, 0);
5043
5044         return YAFFS_OK;
5045 }
5046
5047 loff_t yaffs_GetFileSize(yaffs_Object *obj)
5048 {
5049         obj = yaffs_GetEquivalentObject(obj);
5050
5051         switch (obj->variantType) {
5052         case YAFFS_OBJECT_TYPE_FILE:
5053                 return obj->variant.fileVariant.fileSize;
5054         case YAFFS_OBJECT_TYPE_SYMLINK:
5055                 return yaffs_strlen(obj->variant.symLinkVariant.alias);
5056         default:
5057                 return 0;
5058         }
5059 }
5060
5061
5062
5063 int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
5064 {
5065         int retVal;
5066         if (in->dirty) {
5067                 yaffs_FlushFilesChunkCache(in);
5068                 if(dataSync) /* Only sync data */
5069                         retVal=YAFFS_OK;
5070                 else {
5071                         if (updateTime) {
5072 #ifdef CONFIG_YAFFS_WINCE
5073                                 yfsd_WinFileTimeNow(in->win_mtime);
5074 #else
5075
5076                                 in->yst_mtime = Y_CURRENT_TIME;
5077
5078 #endif
5079                         }
5080
5081                         retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
5082                                 0) ? YAFFS_OK : YAFFS_FAIL;
5083                 }
5084         } else {
5085                 retVal = YAFFS_OK;
5086         }
5087
5088         return retVal;
5089
5090 }
5091
5092 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
5093 {
5094
5095         /* First off, invalidate the file's data in the cache, without flushing. */
5096         yaffs_InvalidateWholeChunkCache(in);
5097
5098         if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
5099                 /* Move to the unlinked directory so we have a record that it was deleted. */
5100                 yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
5101
5102         }
5103
5104         yaffs_RemoveObjectFromDirectory(in);
5105         yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
5106         in->hdrChunk = 0;
5107
5108         yaffs_FreeObject(in);
5109         return YAFFS_OK;
5110
5111 }
5112
5113 /* yaffs_DeleteFile deletes the whole file data
5114  * and the inode associated with the file.
5115  * It does not delete the links associated with the file.
5116  */
5117 static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
5118 {
5119
5120         int retVal;
5121         int immediateDeletion = 0;
5122
5123 #ifdef __KERNEL__
5124         if (!in->myInode)
5125                 immediateDeletion = 1;
5126 #else
5127         if (in->inUse <= 0)
5128                 immediateDeletion = 1;
5129 #endif
5130
5131         if (immediateDeletion) {
5132                 retVal =
5133                     yaffs_ChangeObjectName(in, in->myDev->deletedDir,
5134                                            _Y("deleted"), 0, 0);
5135                 T(YAFFS_TRACE_TRACING,
5136                   (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
5137                    in->objectId));
5138                 in->deleted = 1;
5139                 in->myDev->nDeletedFiles++;
5140                 if (1 || in->myDev->isYaffs2)
5141                         yaffs_ResizeFile(in, 0);
5142                 yaffs_SoftDeleteFile(in);
5143         } else {
5144                 retVal =
5145                     yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
5146                                            _Y("unlinked"), 0, 0);
5147         }
5148
5149
5150         return retVal;
5151 }
5152
5153 int yaffs_DeleteFile(yaffs_Object *in)
5154 {
5155         int retVal = YAFFS_OK;
5156         int deleted = in->deleted;
5157
5158         yaffs_ResizeFile(in, 0);
5159
5160         if (in->nDataChunks > 0) {
5161                 /* Use soft deletion if there is data in the file.
5162                  * That won't be the case if it has been resized to zero.
5163                  */
5164                 if (!in->unlinked)
5165                         retVal = yaffs_UnlinkFileIfNeeded(in);
5166
5167                 if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
5168                         in->deleted = 1;
5169                         deleted = 1;
5170                         in->myDev->nDeletedFiles++;
5171                         yaffs_SoftDeleteFile(in);
5172                 }
5173                 return deleted ? YAFFS_OK : YAFFS_FAIL;
5174         } else {
5175                 /* The file has no data chunks so we toss it immediately */
5176                 yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
5177                 in->variant.fileVariant.top = NULL;
5178                 yaffs_DoGenericObjectDeletion(in);
5179
5180                 return YAFFS_OK;
5181         }
5182 }
5183
5184 static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
5185 {
5186         return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
5187                 !(ylist_empty(&obj->variant.directoryVariant.children));
5188 }
5189
5190 static int yaffs_DeleteDirectory(yaffs_Object *obj)
5191 {
5192         /* First check that the directory is empty. */
5193         if (yaffs_IsNonEmptyDirectory(obj))
5194                 return YAFFS_FAIL;
5195
5196         return yaffs_DoGenericObjectDeletion(obj);
5197 }
5198
5199 static int yaffs_DeleteSymLink(yaffs_Object *in)
5200 {
5201         YFREE(in->variant.symLinkVariant.alias);
5202
5203         return yaffs_DoGenericObjectDeletion(in);
5204 }
5205
5206 static int yaffs_DeleteHardLink(yaffs_Object *in)
5207 {
5208         /* remove this hardlink from the list assocaited with the equivalent
5209          * object
5210          */
5211         ylist_del_init(&in->hardLinks);
5212         return yaffs_DoGenericObjectDeletion(in);
5213 }
5214
5215 int yaffs_DeleteObject(yaffs_Object *obj)
5216 {
5217 int retVal = -1;
5218         switch (obj->variantType) {
5219         case YAFFS_OBJECT_TYPE_FILE:
5220                 retVal = yaffs_DeleteFile(obj);
5221                 break;
5222         case YAFFS_OBJECT_TYPE_DIRECTORY:
5223                 return yaffs_DeleteDirectory(obj);
5224                 break;
5225         case YAFFS_OBJECT_TYPE_SYMLINK:
5226                 retVal = yaffs_DeleteSymLink(obj);
5227                 break;
5228         case YAFFS_OBJECT_TYPE_HARDLINK:
5229                 retVal = yaffs_DeleteHardLink(obj);
5230                 break;
5231         case YAFFS_OBJECT_TYPE_SPECIAL:
5232                 retVal = yaffs_DoGenericObjectDeletion(obj);
5233                 break;
5234         case YAFFS_OBJECT_TYPE_UNKNOWN:
5235                 retVal = 0;
5236                 break;          /* should not happen. */
5237         }
5238
5239         return retVal;
5240 }
5241
5242 static int yaffs_UnlinkWorker(yaffs_Object *obj)
5243 {
5244
5245         int immediateDeletion = 0;
5246
5247 #ifdef __KERNEL__
5248         if (!obj->myInode)
5249                 immediateDeletion = 1;
5250 #else
5251         if (obj->inUse <= 0)
5252                 immediateDeletion = 1;
5253 #endif
5254
5255         if(obj)
5256                 yaffs_UpdateParent(obj->parent);
5257
5258         if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
5259                 return yaffs_DeleteHardLink(obj);
5260         } else if (!ylist_empty(&obj->hardLinks)) {
5261                 /* Curve ball: We're unlinking an object that has a hardlink.
5262                  *
5263                  * This problem arises because we are not strictly following
5264                  * The Linux link/inode model.
5265                  *
5266                  * We can't really delete the object.
5267                  * Instead, we do the following:
5268                  * - Select a hardlink.
5269                  * - Unhook it from the hard links
5270                  * - Unhook it from its parent directory (so that the rename can work)
5271                  * - Rename the object to the hardlink's name.
5272                  * - Delete the hardlink
5273                  */
5274
5275                 yaffs_Object *hl;
5276                 int retVal;
5277                 YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
5278
5279                 hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
5280
5281                 ylist_del_init(&hl->hardLinks);
5282                 ylist_del_init(&hl->siblings);
5283
5284                 yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
5285
5286                 retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
5287
5288                 if (retVal == YAFFS_OK)
5289                         retVal = yaffs_DoGenericObjectDeletion(hl);
5290
5291                 return retVal;
5292
5293         } else if (immediateDeletion) {
5294                 switch (obj->variantType) {
5295                 case YAFFS_OBJECT_TYPE_FILE:
5296                         return yaffs_DeleteFile(obj);
5297                         break;
5298                 case YAFFS_OBJECT_TYPE_DIRECTORY:
5299                         return yaffs_DeleteDirectory(obj);
5300                         break;
5301                 case YAFFS_OBJECT_TYPE_SYMLINK:
5302                         return yaffs_DeleteSymLink(obj);
5303                         break;
5304                 case YAFFS_OBJECT_TYPE_SPECIAL:
5305                         return yaffs_DoGenericObjectDeletion(obj);
5306                         break;
5307                 case YAFFS_OBJECT_TYPE_HARDLINK:
5308                 case YAFFS_OBJECT_TYPE_UNKNOWN:
5309                 default:
5310                         return YAFFS_FAIL;
5311                 }
5312         } else if(yaffs_IsNonEmptyDirectory(obj))
5313                 return YAFFS_FAIL;
5314         else
5315                 return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
5316                                            _Y("unlinked"), 0, 0);
5317 }
5318
5319
5320 static int yaffs_UnlinkObject(yaffs_Object *obj)
5321 {
5322
5323         if (obj && obj->unlinkAllowed)
5324                 return yaffs_UnlinkWorker(obj);
5325
5326         return YAFFS_FAIL;
5327
5328 }
5329 int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
5330 {
5331         yaffs_Object *obj;
5332
5333         obj = yaffs_FindObjectByName(dir, name);
5334         return yaffs_UnlinkObject(obj);
5335 }
5336
5337 /*----------------------- Initialisation Scanning ---------------------- */
5338
5339 static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
5340                                 int backwardScanning)
5341 {
5342         yaffs_Object *obj;
5343
5344         if (!backwardScanning) {
5345                 /* Handle YAFFS1 forward scanning case
5346                  * For YAFFS1 we always do the deletion
5347                  */
5348
5349         } else {
5350                 /* Handle YAFFS2 case (backward scanning)
5351                  * If the shadowed object exists then ignore.
5352                  */
5353                 if (yaffs_FindObjectByNumber(dev, objId))
5354                         return;
5355         }
5356
5357         /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
5358          * We put it in unlinked dir to be cleaned up after the scanning
5359          */
5360         obj =
5361             yaffs_FindOrCreateObjectByNumber(dev, objId,
5362                                              YAFFS_OBJECT_TYPE_FILE);
5363         if (!obj)
5364                 return;
5365         yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
5366         obj->variant.fileVariant.shrinkSize = 0;
5367         obj->valid = 1;         /* So that we don't read any other info for this file */
5368
5369 }
5370
5371 typedef struct {
5372         int seq;
5373         int block;
5374 } yaffs_BlockIndex;
5375
5376
5377 static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
5378 {
5379         yaffs_Object *hl;
5380         yaffs_Object *in;
5381
5382         while (hardList) {
5383                 hl = hardList;
5384                 hardList = (yaffs_Object *) (hardList->hardLinks.next);
5385
5386                 in = yaffs_FindObjectByNumber(dev,
5387                                               hl->variant.hardLinkVariant.
5388                                               equivalentObjectId);
5389
5390                 if (in) {
5391                         /* Add the hardlink pointers */
5392                         hl->variant.hardLinkVariant.equivalentObject = in;
5393                         ylist_add(&hl->hardLinks, &in->hardLinks);
5394                 } else {
5395                         /* Todo Need to report/handle this better.
5396                          * Got a problem... hardlink to a non-existant object
5397                          */
5398                         hl->variant.hardLinkVariant.equivalentObject = NULL;
5399                         YINIT_LIST_HEAD(&hl->hardLinks);
5400
5401                 }
5402         }
5403 }
5404
5405
5406
5407
5408
5409 static int ybicmp(const void *a, const void *b)
5410 {
5411         register int aseq = ((yaffs_BlockIndex *)a)->seq;
5412         register int bseq = ((yaffs_BlockIndex *)b)->seq;
5413         register int ablock = ((yaffs_BlockIndex *)a)->block;
5414         register int bblock = ((yaffs_BlockIndex *)b)->block;
5415         if (aseq == bseq)
5416                 return ablock - bblock;
5417         else
5418                 return aseq - bseq;
5419 }
5420
5421
5422 struct yaffs_ShadowFixerStruct {
5423         int objectId;
5424         int shadowedId;
5425         struct yaffs_ShadowFixerStruct *next;
5426 };
5427
5428
5429 static void yaffs_StripDeletedObjects(yaffs_Device *dev)
5430 {
5431         /*
5432         *  Sort out state of unlinked and deleted objects after scanning.
5433         */
5434         struct ylist_head *i;
5435         struct ylist_head *n;
5436         yaffs_Object *l;
5437
5438         /* Soft delete all the unlinked files */
5439         ylist_for_each_safe(i, n,
5440                 &dev->unlinkedDir->variant.directoryVariant.children) {
5441                 if (i) {
5442                         l = ylist_entry(i, yaffs_Object, siblings);
5443                         yaffs_DeleteObject(l);
5444                 }
5445         }
5446
5447         ylist_for_each_safe(i, n,
5448                 &dev->deletedDir->variant.directoryVariant.children) {
5449                 if (i) {
5450                         l = ylist_entry(i, yaffs_Object, siblings);
5451                         yaffs_DeleteObject(l);
5452                 }
5453         }
5454
5455 }
5456
5457 static int yaffs_Scan(yaffs_Device *dev)
5458 {
5459         yaffs_ExtendedTags tags;
5460         int blk;
5461         int blockIterator;
5462         int startIterator;
5463         int endIterator;
5464         int result;
5465
5466         int chunk;
5467         int c;
5468         int deleted;
5469         yaffs_BlockState state;
5470         yaffs_Object *hardList = NULL;
5471         yaffs_BlockInfo *bi;
5472         __u32 sequenceNumber;
5473         yaffs_ObjectHeader *oh;
5474         yaffs_Object *in;
5475         yaffs_Object *parent;
5476
5477         int alloc_failed = 0;
5478
5479         struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
5480
5481
5482         __u8 *chunkData;
5483
5484
5485
5486         T(YAFFS_TRACE_SCAN,
5487           (TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
5488            dev->internalStartBlock, dev->internalEndBlock));
5489
5490         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5491
5492         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
5493
5494         /* Scan all the blocks to determine their state */
5495         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
5496                 bi = yaffs_GetBlockInfo(dev, blk);
5497                 yaffs_ClearChunkBits(dev, blk);
5498                 bi->pagesInUse = 0;
5499                 bi->softDeletions = 0;
5500
5501                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
5502
5503                 bi->blockState = state;
5504                 bi->sequenceNumber = sequenceNumber;
5505
5506                 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
5507                         bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
5508
5509                 T(YAFFS_TRACE_SCAN_DEBUG,
5510                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
5511                    state, sequenceNumber));
5512
5513                 if (state == YAFFS_BLOCK_STATE_DEAD) {
5514                         T(YAFFS_TRACE_BAD_BLOCKS,
5515                           (TSTR("block %d is bad" TENDSTR), blk));
5516                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
5517                         T(YAFFS_TRACE_SCAN_DEBUG,
5518                           (TSTR("Block empty " TENDSTR)));
5519                         dev->nErasedBlocks++;
5520                         dev->nFreeChunks += dev->nChunksPerBlock;
5521                 }
5522         }
5523
5524         startIterator = dev->internalStartBlock;
5525         endIterator = dev->internalEndBlock;
5526
5527         /* For each block.... */
5528         for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
5529              blockIterator++) {
5530
5531                 YYIELD();
5532
5533                 YYIELD();
5534
5535                 blk = blockIterator;
5536
5537                 bi = yaffs_GetBlockInfo(dev, blk);
5538                 state = bi->blockState;
5539
5540                 deleted = 0;
5541
5542                 /* For each chunk in each block that needs scanning....*/
5543                 for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
5544                      state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
5545                         /* Read the tags and decide what to do */
5546                         chunk = blk * dev->nChunksPerBlock + c;
5547
5548                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
5549                                                         &tags);
5550
5551                         /* Let's have a good look at this chunk... */
5552
5553                         if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
5554                                 /* YAFFS1 only...
5555                                  * A deleted chunk
5556                                  */
5557                                 deleted++;
5558                                 dev->nFreeChunks++;
5559                                 /*T((" %d %d deleted\n",blk,c)); */
5560                         } else if (!tags.chunkUsed) {
5561                                 /* An unassigned chunk in the block
5562                                  * This means that either the block is empty or
5563                                  * this is the one being allocated from
5564                                  */
5565
5566                                 if (c == 0) {
5567                                         /* We're looking at the first chunk in the block so the block is unused */
5568                                         state = YAFFS_BLOCK_STATE_EMPTY;
5569                                         dev->nErasedBlocks++;
5570                                 } else {
5571                                         /* this is the block being allocated from */
5572                                         T(YAFFS_TRACE_SCAN,
5573                                           (TSTR
5574                                            (" Allocating from %d %d" TENDSTR),
5575                                            blk, c));
5576                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
5577                                         dev->allocationBlock = blk;
5578                                         dev->allocationPage = c;
5579                                         dev->allocationBlockFinder = blk;
5580                                         /* Set it to here to encourage the allocator to go forth from here. */
5581
5582                                 }
5583
5584                                 dev->nFreeChunks += (dev->nChunksPerBlock - c);
5585                         } else if (tags.chunkId > 0) {
5586                                 /* chunkId > 0 so it is a data chunk... */
5587                                 unsigned int endpos;
5588
5589                                 yaffs_SetChunkBit(dev, blk, c);
5590                                 bi->pagesInUse++;
5591
5592                                 in = yaffs_FindOrCreateObjectByNumber(dev,
5593                                                                       tags.
5594                                                                       objectId,
5595                                                                       YAFFS_OBJECT_TYPE_FILE);
5596                                 /* PutChunkIntoFile checks for a clash (two data chunks with
5597                                  * the same chunkId).
5598                                  */
5599
5600                                 if (!in)
5601                                         alloc_failed = 1;
5602
5603                                 if (in) {
5604                                         if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
5605                                                 alloc_failed = 1;
5606                                 }
5607
5608                                 endpos =
5609                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk +
5610                                     tags.byteCount;
5611                                 if (in &&
5612                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
5613                                     && in->variant.fileVariant.scannedFileSize <
5614                                     endpos) {
5615                                         in->variant.fileVariant.
5616                                             scannedFileSize = endpos;
5617                                         if (!dev->useHeaderFileSize) {
5618                                                 in->variant.fileVariant.
5619                                                     fileSize =
5620                                                     in->variant.fileVariant.
5621                                                     scannedFileSize;
5622                                         }
5623
5624                                 }
5625                                 /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
5626                         } else {
5627                                 /* chunkId == 0, so it is an ObjectHeader.
5628                                  * Thus, we read in the object header and make the object
5629                                  */
5630                                 yaffs_SetChunkBit(dev, blk, c);
5631                                 bi->pagesInUse++;
5632
5633                                 result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
5634                                                                 chunkData,
5635                                                                 NULL);
5636
5637                                 oh = (yaffs_ObjectHeader *) chunkData;
5638
5639                                 in = yaffs_FindObjectByNumber(dev,
5640                                                               tags.objectId);
5641                                 if (in && in->variantType != oh->type) {
5642                                         /* This should not happen, but somehow
5643                                          * Wev'e ended up with an objectId that has been reused but not yet
5644                                          * deleted, and worse still it has changed type. Delete the old object.
5645                                          */
5646
5647                                         yaffs_DeleteObject(in);
5648
5649                                         in = 0;
5650                                 }
5651
5652                                 in = yaffs_FindOrCreateObjectByNumber(dev,
5653                                                                       tags.
5654                                                                       objectId,
5655                                                                       oh->type);
5656
5657                                 if (!in)
5658                                         alloc_failed = 1;
5659
5660                                 if (in && oh->shadowsObject > 0) {
5661
5662                                         struct yaffs_ShadowFixerStruct *fixer;
5663                                         fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
5664                                         if (fixer) {
5665                                                 fixer->next = shadowFixerList;
5666                                                 shadowFixerList = fixer;
5667                                                 fixer->objectId = tags.objectId;
5668                                                 fixer->shadowedId = oh->shadowsObject;
5669                                         }
5670
5671                                 }
5672
5673                                 if (in && in->valid) {
5674                                         /* We have already filled this one. We have a duplicate and need to resolve it. */
5675
5676                                         unsigned existingSerial = in->serial;
5677                                         unsigned newSerial = tags.serialNumber;
5678
5679                                         if (((existingSerial + 1) & 3) == newSerial) {
5680                                                 /* Use new one - destroy the exisiting one */
5681                                                 yaffs_DeleteChunk(dev,
5682                                                                   in->hdrChunk,
5683                                                                   1, __LINE__);
5684                                                 in->valid = 0;
5685                                         } else {
5686                                                 /* Use existing - destroy this one. */
5687                                                 yaffs_DeleteChunk(dev, chunk, 1,
5688                                                                   __LINE__);
5689                                         }
5690                                 }
5691
5692                                 if (in && !in->valid &&
5693                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
5694                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
5695                                         /* We only load some info, don't fiddle with directory structure */
5696                                         in->valid = 1;
5697                                         in->variantType = oh->type;
5698
5699                                         in->yst_mode = oh->yst_mode;
5700 #ifdef CONFIG_YAFFS_WINCE
5701                                         in->win_atime[0] = oh->win_atime[0];
5702                                         in->win_ctime[0] = oh->win_ctime[0];
5703                                         in->win_mtime[0] = oh->win_mtime[0];
5704                                         in->win_atime[1] = oh->win_atime[1];
5705                                         in->win_ctime[1] = oh->win_ctime[1];
5706                                         in->win_mtime[1] = oh->win_mtime[1];
5707 #else
5708                                         in->yst_uid = oh->yst_uid;
5709                                         in->yst_gid = oh->yst_gid;
5710                                         in->yst_atime = oh->yst_atime;
5711                                         in->yst_mtime = oh->yst_mtime;
5712                                         in->yst_ctime = oh->yst_ctime;
5713                                         in->yst_rdev = oh->yst_rdev;
5714 #endif
5715                                         in->hdrChunk = chunk;
5716                                         in->serial = tags.serialNumber;
5717
5718                                 } else if (in && !in->valid) {
5719                                         /* we need to load this info */
5720
5721                                         in->valid = 1;
5722                                         in->variantType = oh->type;
5723
5724                                         in->yst_mode = oh->yst_mode;
5725 #ifdef CONFIG_YAFFS_WINCE
5726                                         in->win_atime[0] = oh->win_atime[0];
5727                                         in->win_ctime[0] = oh->win_ctime[0];
5728                                         in->win_mtime[0] = oh->win_mtime[0];
5729                                         in->win_atime[1] = oh->win_atime[1];
5730                                         in->win_ctime[1] = oh->win_ctime[1];
5731                                         in->win_mtime[1] = oh->win_mtime[1];
5732 #else
5733                                         in->yst_uid = oh->yst_uid;
5734                                         in->yst_gid = oh->yst_gid;
5735                                         in->yst_atime = oh->yst_atime;
5736                                         in->yst_mtime = oh->yst_mtime;
5737                                         in->yst_ctime = oh->yst_ctime;
5738                                         in->yst_rdev = oh->yst_rdev;
5739 #endif
5740                                         in->hdrChunk = chunk;
5741                                         in->serial = tags.serialNumber;
5742
5743                                         yaffs_SetObjectName(in, oh->name);
5744                                         in->dirty = 0;
5745
5746                                         /* directory stuff...
5747                                          * hook up to parent
5748                                          */
5749
5750                                         parent =
5751                                             yaffs_FindOrCreateObjectByNumber
5752                                             (dev, oh->parentObjectId,
5753                                              YAFFS_OBJECT_TYPE_DIRECTORY);
5754                                         if (!parent)
5755                                                 alloc_failed = 1;
5756                                         if (parent && parent->variantType ==
5757                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
5758                                                 /* Set up as a directory */
5759                                                 parent->variantType =
5760                                                         YAFFS_OBJECT_TYPE_DIRECTORY;
5761                                                 YINIT_LIST_HEAD(&parent->variant.
5762                                                                 directoryVariant.
5763                                                                 children);
5764                                         } else if (!parent || parent->variantType !=
5765                                                    YAFFS_OBJECT_TYPE_DIRECTORY) {
5766                                                 /* Hoosterman, another problem....
5767                                                  * We're trying to use a non-directory as a directory
5768                                                  */
5769
5770                                                 T(YAFFS_TRACE_ERROR,
5771                                                   (TSTR
5772                                                    ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
5773                                                     TENDSTR)));
5774                                                 parent = dev->lostNFoundDir;
5775                                         }
5776
5777                                         yaffs_AddObjectToDirectory(parent, in);
5778
5779                                         if (0 && (parent == dev->deletedDir ||
5780                                                   parent == dev->unlinkedDir)) {
5781                                                 in->deleted = 1;        /* If it is unlinked at start up then it wants deleting */
5782                                                 dev->nDeletedFiles++;
5783                                         }
5784                                         /* Note re hardlinks.
5785                                          * Since we might scan a hardlink before its equivalent object is scanned
5786                                          * we put them all in a list.
5787                                          * After scanning is complete, we should have all the objects, so we run through this
5788                                          * list and fix up all the chains.
5789                                          */
5790
5791                                         switch (in->variantType) {
5792                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
5793                                                 /* Todo got a problem */
5794                                                 break;
5795                                         case YAFFS_OBJECT_TYPE_FILE:
5796                                                 if (dev->useHeaderFileSize)
5797
5798                                                         in->variant.fileVariant.
5799                                                             fileSize =
5800                                                             oh->fileSize;
5801
5802                                                 break;
5803                                         case YAFFS_OBJECT_TYPE_HARDLINK:
5804                                                 in->variant.hardLinkVariant.
5805                                                         equivalentObjectId =
5806                                                         oh->equivalentObjectId;
5807                                                 in->hardLinks.next =
5808                                                         (struct ylist_head *)
5809                                                         hardList;
5810                                                 hardList = in;
5811                                                 break;
5812                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
5813                                                 /* Do nothing */
5814                                                 break;
5815                                         case YAFFS_OBJECT_TYPE_SPECIAL:
5816                                                 /* Do nothing */
5817                                                 break;
5818                                         case YAFFS_OBJECT_TYPE_SYMLINK:
5819                                                 in->variant.symLinkVariant.alias =
5820                                                     yaffs_CloneString(oh->alias);
5821                                                 if (!in->variant.symLinkVariant.alias)
5822                                                         alloc_failed = 1;
5823                                                 break;
5824                                         }
5825
5826 /*
5827                                         if (parent == dev->deletedDir) {
5828                                                 yaffs_DestroyObject(in);
5829                                                 bi->hasShrinkHeader = 1;
5830                                         }
5831 */
5832                                 }
5833                         }
5834                 }
5835
5836                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
5837                         /* If we got this far while scanning, then the block is fully allocated.*/
5838                         state = YAFFS_BLOCK_STATE_FULL;
5839                 }
5840
5841                 bi->blockState = state;
5842
5843                 /* Now let's see if it was dirty */
5844                 if (bi->pagesInUse == 0 &&
5845                     !bi->hasShrinkHeader &&
5846                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
5847                         yaffs_BlockBecameDirty(dev, blk);
5848                 }
5849
5850         }
5851
5852
5853         /* Ok, we've done all the scanning.
5854          * Fix up the hard link chains.
5855          * We should now have scanned all the objects, now it's time to add these
5856          * hardlinks.
5857          */
5858
5859         yaffs_HardlinkFixup(dev, hardList);
5860
5861         /* Fix up any shadowed objects */
5862         {
5863                 struct yaffs_ShadowFixerStruct *fixer;
5864                 yaffs_Object *obj;
5865
5866                 while (shadowFixerList) {
5867                         fixer = shadowFixerList;
5868                         shadowFixerList = fixer->next;
5869                         /* Complete the rename transaction by deleting the shadowed object
5870                          * then setting the object header to unshadowed.
5871                          */
5872                         obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
5873                         if (obj)
5874                                 yaffs_DeleteObject(obj);
5875
5876                         obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
5877
5878                         if (obj)
5879                                 yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
5880
5881                         YFREE(fixer);
5882                 }
5883         }
5884
5885         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5886
5887         if (alloc_failed)
5888                 return YAFFS_FAIL;
5889
5890         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
5891
5892
5893         return YAFFS_OK;
5894 }
5895
5896 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
5897 {
5898         __u8 *chunkData;
5899         yaffs_ObjectHeader *oh;
5900         yaffs_Device *dev;
5901         yaffs_ExtendedTags tags;
5902         int result;
5903         int alloc_failed = 0;
5904
5905         if (!in)
5906                 return;
5907
5908         dev = in->myDev;
5909
5910 #if 0
5911         T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
5912                 in->objectId,
5913                 in->lazyLoaded ? "not yet" : "already"));
5914 #endif
5915
5916         if (in->lazyLoaded && in->hdrChunk > 0) {
5917                 in->lazyLoaded = 0;
5918                 chunkData = yaffs_GetTempBuffer(dev, __LINE__);
5919
5920                 result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
5921                 oh = (yaffs_ObjectHeader *) chunkData;
5922
5923                 in->yst_mode = oh->yst_mode;
5924 #ifdef CONFIG_YAFFS_WINCE
5925                 in->win_atime[0] = oh->win_atime[0];
5926                 in->win_ctime[0] = oh->win_ctime[0];
5927                 in->win_mtime[0] = oh->win_mtime[0];
5928                 in->win_atime[1] = oh->win_atime[1];
5929                 in->win_ctime[1] = oh->win_ctime[1];
5930                 in->win_mtime[1] = oh->win_mtime[1];
5931 #else
5932                 in->yst_uid = oh->yst_uid;
5933                 in->yst_gid = oh->yst_gid;
5934                 in->yst_atime = oh->yst_atime;
5935                 in->yst_mtime = oh->yst_mtime;
5936                 in->yst_ctime = oh->yst_ctime;
5937                 in->yst_rdev = oh->yst_rdev;
5938
5939 #endif
5940                 yaffs_SetObjectName(in, oh->name);
5941
5942                 if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
5943                         in->variant.symLinkVariant.alias =
5944                                                     yaffs_CloneString(oh->alias);
5945                         if (!in->variant.symLinkVariant.alias)
5946                                 alloc_failed = 1; /* Not returned to caller */
5947                 }
5948
5949                 yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
5950         }
5951 }
5952
5953 static int yaffs_ScanBackwards(yaffs_Device *dev)
5954 {
5955         yaffs_ExtendedTags tags;
5956         int blk;
5957         int blockIterator;
5958         int startIterator;
5959         int endIterator;
5960         int nBlocksToScan = 0;
5961
5962         int chunk;
5963         int result;
5964         int c;
5965         int deleted;
5966         yaffs_BlockState state;
5967         yaffs_Object *hardList = NULL;
5968         yaffs_BlockInfo *bi;
5969         __u32 sequenceNumber;
5970         yaffs_ObjectHeader *oh;
5971         yaffs_Object *in;
5972         yaffs_Object *parent;
5973         int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
5974         int itsUnlinked;
5975         __u8 *chunkData;
5976
5977         int fileSize;
5978         int isShrink;
5979         int foundChunksInBlock;
5980         int equivalentObjectId;
5981         int alloc_failed = 0;
5982
5983
5984         yaffs_BlockIndex *blockIndex = NULL;
5985         int altBlockIndex = 0;
5986
5987         if (!dev->isYaffs2) {
5988                 T(YAFFS_TRACE_SCAN,
5989                   (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
5990                 return YAFFS_FAIL;
5991         }
5992
5993         T(YAFFS_TRACE_SCAN,
5994           (TSTR
5995            ("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..."
5996             TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
5997
5998
5999         dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
6000
6001         blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
6002
6003         if (!blockIndex) {
6004                 blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
6005                 altBlockIndex = 1;
6006         }
6007
6008         if (!blockIndex) {
6009                 T(YAFFS_TRACE_SCAN,
6010                   (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
6011                 return YAFFS_FAIL;
6012         }
6013
6014         dev->blocksInCheckpoint = 0;
6015
6016         chunkData = yaffs_GetTempBuffer(dev, __LINE__);
6017
6018         /* Scan all the blocks to determine their state */
6019         for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
6020                 bi = yaffs_GetBlockInfo(dev, blk);
6021                 yaffs_ClearChunkBits(dev, blk);
6022                 bi->pagesInUse = 0;
6023                 bi->softDeletions = 0;
6024
6025                 yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
6026
6027                 bi->blockState = state;
6028                 bi->sequenceNumber = sequenceNumber;
6029
6030                 if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
6031                         bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
6032                 if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
6033                         bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
6034
6035                 T(YAFFS_TRACE_SCAN_DEBUG,
6036                   (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
6037                    state, sequenceNumber));
6038
6039
6040                 if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
6041                         dev->blocksInCheckpoint++;
6042
6043                 } else if (state == YAFFS_BLOCK_STATE_DEAD) {
6044                         T(YAFFS_TRACE_BAD_BLOCKS,
6045                           (TSTR("block %d is bad" TENDSTR), blk));
6046                 } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
6047                         T(YAFFS_TRACE_SCAN_DEBUG,
6048                           (TSTR("Block empty " TENDSTR)));
6049                         dev->nErasedBlocks++;
6050                         dev->nFreeChunks += dev->nChunksPerBlock;
6051                 } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6052
6053                         /* Determine the highest sequence number */
6054                         if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
6055                             sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
6056
6057                                 blockIndex[nBlocksToScan].seq = sequenceNumber;
6058                                 blockIndex[nBlocksToScan].block = blk;
6059
6060                                 nBlocksToScan++;
6061
6062                                 if (sequenceNumber >= dev->sequenceNumber)
6063                                         dev->sequenceNumber = sequenceNumber;
6064                         } else {
6065                                 /* TODO: Nasty sequence number! */
6066                                 T(YAFFS_TRACE_SCAN,
6067                                   (TSTR
6068                                    ("Block scanning block %d has bad sequence number %d"
6069                                     TENDSTR), blk, sequenceNumber));
6070
6071                         }
6072                 }
6073         }
6074
6075         T(YAFFS_TRACE_SCAN,
6076         (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
6077
6078
6079
6080         YYIELD();
6081
6082         /* Sort the blocks */
6083 #ifndef CONFIG_YAFFS_USE_OWN_SORT
6084         {
6085                 /* Use qsort now. */
6086                 yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
6087         }
6088 #else
6089         {
6090                 /* Dungy old bubble sort... */
6091
6092                 yaffs_BlockIndex temp;
6093                 int i;
6094                 int j;
6095
6096                 for (i = 0; i < nBlocksToScan; i++)
6097                         for (j = i + 1; j < nBlocksToScan; j++)
6098                                 if (blockIndex[i].seq > blockIndex[j].seq) {
6099                                         temp = blockIndex[j];
6100                                         blockIndex[j] = blockIndex[i];
6101                                         blockIndex[i] = temp;
6102                                 }
6103         }
6104 #endif
6105
6106         YYIELD();
6107
6108         T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
6109
6110         /* Now scan the blocks looking at the data. */
6111         startIterator = 0;
6112         endIterator = nBlocksToScan - 1;
6113         T(YAFFS_TRACE_SCAN_DEBUG,
6114           (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
6115
6116         /* For each block.... backwards */
6117         for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
6118                         blockIterator--) {
6119                 /* Cooperative multitasking! This loop can run for so
6120                    long that watchdog timers expire. */
6121                 YYIELD();
6122
6123                 /* get the block to scan in the correct order */
6124                 blk = blockIndex[blockIterator].block;
6125
6126                 bi = yaffs_GetBlockInfo(dev, blk);
6127
6128
6129                 state = bi->blockState;
6130
6131                 deleted = 0;
6132
6133                 /* For each chunk in each block that needs scanning.... */
6134                 foundChunksInBlock = 0;
6135                 for (c = dev->nChunksPerBlock - 1;
6136                      !alloc_failed && c >= 0 &&
6137                      (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6138                       state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
6139                         /* Scan backwards...
6140                          * Read the tags and decide what to do
6141                          */
6142
6143                         chunk = blk * dev->nChunksPerBlock + c;
6144
6145                         result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
6146                                                         &tags);
6147
6148                         /* Let's have a good look at this chunk... */
6149
6150                         if (!tags.chunkUsed) {
6151                                 /* An unassigned chunk in the block.
6152                                  * If there are used chunks after this one, then
6153                                  * it is a chunk that was skipped due to failing the erased
6154                                  * check. Just skip it so that it can be deleted.
6155                                  * But, more typically, We get here when this is an unallocated
6156                                  * chunk and his means that either the block is empty or
6157                                  * this is the one being allocated from
6158                                  */
6159
6160                                 if (foundChunksInBlock) {
6161                                         /* This is a chunk that was skipped due to failing the erased check */
6162                                 } else if (c == 0) {
6163                                         /* We're looking at the first chunk in the block so the block is unused */
6164                                         state = YAFFS_BLOCK_STATE_EMPTY;
6165                                         dev->nErasedBlocks++;
6166                                 } else {
6167                                         if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
6168                                             state == YAFFS_BLOCK_STATE_ALLOCATING) {
6169                                                 if (dev->sequenceNumber == bi->sequenceNumber) {
6170                                                         /* this is the block being allocated from */
6171
6172                                                         T(YAFFS_TRACE_SCAN,
6173                                                           (TSTR
6174                                                            (" Allocating from %d %d"
6175                                                             TENDSTR), blk, c));
6176
6177                                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
6178                                                         dev->allocationBlock = blk;
6179                                                         dev->allocationPage = c;
6180                                                         dev->allocationBlockFinder = blk;
6181                                                 } else {
6182                                                         /* This is a partially written block that is not
6183                                                          * the current allocation block. This block must have
6184                                                          * had a write failure, so set up for retirement.
6185                                                          */
6186
6187                                                          /* bi->needsRetiring = 1; ??? TODO */
6188                                                          bi->gcPrioritise = 1;
6189
6190                                                          T(YAFFS_TRACE_ALWAYS,
6191                                                          (TSTR("Partially written block %d detected" TENDSTR),
6192                                                          blk));
6193                                                 }
6194                                         }
6195                                 }
6196
6197                                 dev->nFreeChunks++;
6198
6199                         } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
6200                                 T(YAFFS_TRACE_SCAN,
6201                                   (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
6202                                   blk, c));
6203
6204                                   dev->nFreeChunks++;
6205
6206                         } else if (tags.chunkId > 0) {
6207                                 /* chunkId > 0 so it is a data chunk... */
6208                                 unsigned int endpos;
6209                                 __u32 chunkBase =
6210                                     (tags.chunkId - 1) * dev->nDataBytesPerChunk;
6211
6212                                 foundChunksInBlock = 1;
6213
6214
6215                                 yaffs_SetChunkBit(dev, blk, c);
6216                                 bi->pagesInUse++;
6217
6218                                 in = yaffs_FindOrCreateObjectByNumber(dev,
6219                                                                       tags.
6220                                                                       objectId,
6221                                                                       YAFFS_OBJECT_TYPE_FILE);
6222                                 if (!in) {
6223                                         /* Out of memory */
6224                                         alloc_failed = 1;
6225                                 }
6226
6227                                 if (in &&
6228                                     in->variantType == YAFFS_OBJECT_TYPE_FILE
6229                                     && chunkBase <
6230                                     in->variant.fileVariant.shrinkSize) {
6231                                         /* This has not been invalidated by a resize */
6232                                         if (!yaffs_PutChunkIntoFile(in, tags.chunkId,
6233                                                                chunk, -1)) {
6234                                                 alloc_failed = 1;
6235                                         }
6236
6237                                         /* File size is calculated by looking at the data chunks if we have not
6238                                          * seen an object header yet. Stop this practice once we find an object header.
6239                                          */
6240                                         endpos =
6241                                             (tags.chunkId -
6242                                              1) * dev->nDataBytesPerChunk +
6243                                             tags.byteCount;
6244
6245                                         if (!in->valid &&       /* have not got an object header yet */
6246                                             in->variant.fileVariant.
6247                                             scannedFileSize < endpos) {
6248                                                 in->variant.fileVariant.
6249                                                     scannedFileSize = endpos;
6250                                                 in->variant.fileVariant.
6251                                                     fileSize =
6252                                                     in->variant.fileVariant.
6253                                                     scannedFileSize;
6254                                         }
6255
6256                                 } else if (in) {
6257                                         /* This chunk has been invalidated by a resize, so delete */
6258                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6259
6260                                 }
6261                         } else {
6262                                 /* chunkId == 0, so it is an ObjectHeader.
6263                                  * Thus, we read in the object header and make the object
6264                                  */
6265                                 foundChunksInBlock = 1;
6266
6267                                 yaffs_SetChunkBit(dev, blk, c);
6268                                 bi->pagesInUse++;
6269
6270                                 oh = NULL;
6271                                 in = NULL;
6272
6273                                 if (tags.extraHeaderInfoAvailable) {
6274                                         in = yaffs_FindOrCreateObjectByNumber
6275                                             (dev, tags.objectId,
6276                                              tags.extraObjectType);
6277                                         if (!in)
6278                                                 alloc_failed = 1;
6279                                 }
6280
6281                                 if (!in ||
6282 #ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
6283                                     !in->valid ||
6284 #endif
6285                                     tags.extraShadows ||
6286                                     (!in->valid &&
6287                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6288                                      tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
6289
6290                                         /* If we don't have  valid info then we need to read the chunk
6291                                          * TODO In future we can probably defer reading the chunk and
6292                                          * living with invalid data until needed.
6293                                          */
6294
6295                                         result = yaffs_ReadChunkWithTagsFromNAND(dev,
6296                                                                         chunk,
6297                                                                         chunkData,
6298                                                                         NULL);
6299
6300                                         oh = (yaffs_ObjectHeader *) chunkData;
6301
6302                                         if (dev->inbandTags) {
6303                                                 /* Fix up the header if they got corrupted by inband tags */
6304                                                 oh->shadowsObject = oh->inbandShadowsObject;
6305                                                 oh->isShrink = oh->inbandIsShrink;
6306                                         }
6307
6308                                         if (!in) {
6309                                                 in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
6310                                                 if (!in)
6311                                                         alloc_failed = 1;
6312                                         }
6313
6314                                 }
6315
6316                                 if (!in) {
6317                                         /* TODO Hoosterman we have a problem! */
6318                                         T(YAFFS_TRACE_ERROR,
6319                                           (TSTR
6320                                            ("yaffs tragedy: Could not make object for object  %d at chunk %d during scan"
6321                                             TENDSTR), tags.objectId, chunk));
6322                                         continue;
6323                                 }
6324
6325                                 if (in->valid) {
6326                                         /* We have already filled this one.
6327                                          * We have a duplicate that will be discarded, but
6328                                          * we first have to suck out resize info if it is a file.
6329                                          */
6330
6331                                         if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
6332                                              ((oh &&
6333                                                oh->type == YAFFS_OBJECT_TYPE_FILE) ||
6334                                               (tags.extraHeaderInfoAvailable  &&
6335                                                tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
6336                                                 __u32 thisSize =
6337                                                     (oh) ? oh->fileSize : tags.
6338                                                     extraFileLength;
6339                                                 __u32 parentObjectId =
6340                                                     (oh) ? oh->
6341                                                     parentObjectId : tags.
6342                                                     extraParentObjectId;
6343
6344
6345                                                 isShrink =
6346                                                     (oh) ? oh->isShrink : tags.
6347                                                     extraIsShrinkHeader;
6348
6349                                                 /* If it is deleted (unlinked at start also means deleted)
6350                                                  * we treat the file size as being zeroed at this point.
6351                                                  */
6352                                                 if (parentObjectId ==
6353                                                     YAFFS_OBJECTID_DELETED
6354                                                     || parentObjectId ==
6355                                                     YAFFS_OBJECTID_UNLINKED) {
6356                                                         thisSize = 0;
6357                                                         isShrink = 1;
6358                                                 }
6359
6360                                                 if (isShrink &&
6361                                                     in->variant.fileVariant.
6362                                                     shrinkSize > thisSize) {
6363                                                         in->variant.fileVariant.
6364                                                             shrinkSize =
6365                                                             thisSize;
6366                                                 }
6367
6368                                                 if (isShrink)
6369                                                         bi->hasShrinkHeader = 1;
6370
6371                                         }
6372                                         /* Use existing - destroy this one. */
6373                                         yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
6374
6375                                 }
6376
6377                                 if (!in->valid && in->variantType !=
6378                                     (oh ? oh->type : tags.extraObjectType))
6379                                         T(YAFFS_TRACE_ERROR, (
6380                                                 TSTR("yaffs tragedy: Bad object type, "
6381                                             TCONT("%d != %d, for object %d at chunk ")
6382                                             TCONT("%d during scan")
6383                                                 TENDSTR), oh ?
6384                                             oh->type : tags.extraObjectType,
6385                                             in->variantType, tags.objectId,
6386                                             chunk));
6387
6388                                 if (!in->valid &&
6389                                     (tags.objectId == YAFFS_OBJECTID_ROOT ||
6390                                      tags.objectId ==
6391                                      YAFFS_OBJECTID_LOSTNFOUND)) {
6392                                         /* We only load some info, don't fiddle with directory structure */
6393                                         in->valid = 1;
6394
6395                                         if (oh) {
6396                                                 in->variantType = oh->type;
6397
6398                                                 in->yst_mode = oh->yst_mode;
6399 #ifdef CONFIG_YAFFS_WINCE
6400                                                 in->win_atime[0] = oh->win_atime[0];
6401                                                 in->win_ctime[0] = oh->win_ctime[0];
6402                                                 in->win_mtime[0] = oh->win_mtime[0];
6403                                                 in->win_atime[1] = oh->win_atime[1];
6404                                                 in->win_ctime[1] = oh->win_ctime[1];
6405                                                 in->win_mtime[1] = oh->win_mtime[1];
6406 #else
6407                                                 in->yst_uid = oh->yst_uid;
6408                                                 in->yst_gid = oh->yst_gid;
6409                                                 in->yst_atime = oh->yst_atime;
6410                                                 in->yst_mtime = oh->yst_mtime;
6411                                                 in->yst_ctime = oh->yst_ctime;
6412                                                 in->yst_rdev = oh->yst_rdev;
6413
6414 #endif
6415                                         } else {
6416                                                 in->variantType = tags.extraObjectType;
6417                                                 in->lazyLoaded = 1;
6418                                         }
6419
6420                                         in->hdrChunk = chunk;
6421
6422                                 } else if (!in->valid) {
6423                                         /* we need to load this info */
6424
6425                                         in->valid = 1;
6426                                         in->hdrChunk = chunk;
6427
6428                                         if (oh) {
6429                                                 in->variantType = oh->type;
6430
6431                                                 in->yst_mode = oh->yst_mode;
6432 #ifdef CONFIG_YAFFS_WINCE
6433                                                 in->win_atime[0] = oh->win_atime[0];
6434                                                 in->win_ctime[0] = oh->win_ctime[0];
6435                                                 in->win_mtime[0] = oh->win_mtime[0];
6436                                                 in->win_atime[1] = oh->win_atime[1];
6437                                                 in->win_ctime[1] = oh->win_ctime[1];
6438                                                 in->win_mtime[1] = oh->win_mtime[1];
6439 #else
6440                                                 in->yst_uid = oh->yst_uid;
6441                                                 in->yst_gid = oh->yst_gid;
6442                                                 in->yst_atime = oh->yst_atime;
6443                                                 in->yst_mtime = oh->yst_mtime;
6444                                                 in->yst_ctime = oh->yst_ctime;
6445                                                 in->yst_rdev = oh->yst_rdev;
6446 #endif
6447
6448                                                 if (oh->shadowsObject > 0)
6449                                                         yaffs_HandleShadowedObject(dev,
6450                                                                            oh->
6451                                                                            shadowsObject,
6452                                                                            1);
6453
6454
6455                                                 yaffs_SetObjectName(in, oh->name);
6456                                                 parent =
6457                                                     yaffs_FindOrCreateObjectByNumber
6458                                                         (dev, oh->parentObjectId,
6459                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6460
6461                                                  fileSize = oh->fileSize;
6462                                                  isShrink = oh->isShrink;
6463                                                  equivalentObjectId = oh->equivalentObjectId;
6464
6465                                         } else {
6466                                                 in->variantType = tags.extraObjectType;
6467                                                 parent =
6468                                                     yaffs_FindOrCreateObjectByNumber
6469                                                         (dev, tags.extraParentObjectId,
6470                                                          YAFFS_OBJECT_TYPE_DIRECTORY);
6471                                                  fileSize = tags.extraFileLength;
6472                                                  isShrink = tags.extraIsShrinkHeader;
6473                                                  equivalentObjectId = tags.extraEquivalentObjectId;
6474                                                 in->lazyLoaded = 1;
6475
6476                                         }
6477                                         in->dirty = 0;
6478
6479                                         if (!parent)
6480                                                 alloc_failed = 1;
6481
6482                                         /* directory stuff...
6483                                          * hook up to parent
6484                                          */
6485
6486                                         if (parent && parent->variantType ==
6487                                             YAFFS_OBJECT_TYPE_UNKNOWN) {
6488                                                 /* Set up as a directory */
6489                                                 parent->variantType =
6490                                                         YAFFS_OBJECT_TYPE_DIRECTORY;
6491                                                 YINIT_LIST_HEAD(&parent->variant.
6492                                                         directoryVariant.
6493                                                         children);
6494                                         } else if (!parent || parent->variantType !=
6495                                                    YAFFS_OBJECT_TYPE_DIRECTORY) {
6496                                                 /* Hoosterman, another problem....
6497                                                  * We're trying to use a non-directory as a directory
6498                                                  */
6499
6500                                                 T(YAFFS_TRACE_ERROR,
6501                                                   (TSTR
6502                                                    ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
6503                                                     TENDSTR)));
6504                                                 parent = dev->lostNFoundDir;
6505                                         }
6506
6507                                         yaffs_AddObjectToDirectory(parent, in);
6508
6509                                         itsUnlinked = (parent == dev->deletedDir) ||
6510                                                       (parent == dev->unlinkedDir);
6511
6512                                         if (isShrink) {
6513                                                 /* Mark the block as having a shrinkHeader */
6514                                                 bi->hasShrinkHeader = 1;
6515                                         }
6516
6517                                         /* Note re hardlinks.
6518                                          * Since we might scan a hardlink before its equivalent object is scanned
6519                                          * we put them all in a list.
6520                                          * After scanning is complete, we should have all the objects, so we run
6521                                          * through this list and fix up all the chains.
6522                                          */
6523
6524                                         switch (in->variantType) {
6525                                         case YAFFS_OBJECT_TYPE_UNKNOWN:
6526                                                 /* Todo got a problem */
6527                                                 break;
6528                                         case YAFFS_OBJECT_TYPE_FILE:
6529
6530                                                 if (in->variant.fileVariant.
6531                                                     scannedFileSize < fileSize) {
6532                                                         /* This covers the case where the file size is greater
6533                                                          * than where the data is
6534                                                          * This will happen if the file is resized to be larger
6535                                                          * than its current data extents.
6536                                                          */
6537                                                         in->variant.fileVariant.fileSize = fileSize;
6538                                                         in->variant.fileVariant.scannedFileSize =
6539                                                             in->variant.fileVariant.fileSize;
6540                                                 }
6541
6542                                                 if (isShrink &&
6543                                                     in->variant.fileVariant.shrinkSize > fileSize) {
6544                                                         in->variant.fileVariant.shrinkSize = fileSize;
6545                                                 }
6546
6547                                                 break;
6548                                         case YAFFS_OBJECT_TYPE_HARDLINK:
6549                                                 if (!itsUnlinked) {
6550                                                         in->variant.hardLinkVariant.equivalentObjectId =
6551                                                                 equivalentObjectId;
6552                                                         in->hardLinks.next =
6553                                                                 (struct ylist_head *) hardList;
6554                                                         hardList = in;
6555                                                 }
6556                                                 break;
6557                                         case YAFFS_OBJECT_TYPE_DIRECTORY:
6558                                                 /* Do nothing */
6559                                                 break;
6560                                         case YAFFS_OBJECT_TYPE_SPECIAL:
6561                                                 /* Do nothing */
6562                                                 break;
6563                                         case YAFFS_OBJECT_TYPE_SYMLINK:
6564                                                 if (oh) {
6565                                                         in->variant.symLinkVariant.alias =
6566                                                                 yaffs_CloneString(oh->alias);
6567                                                         if (!in->variant.symLinkVariant.alias)
6568                                                                 alloc_failed = 1;
6569                                                 }
6570                                                 break;
6571                                         }
6572
6573                                 }
6574
6575                         }
6576
6577                 } /* End of scanning for each chunk */
6578
6579                 if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
6580                         /* If we got this far while scanning, then the block is fully allocated. */
6581                         state = YAFFS_BLOCK_STATE_FULL;
6582                 }
6583
6584                 bi->blockState = state;
6585
6586                 /* Now let's see if it was dirty */
6587                 if (bi->pagesInUse == 0 &&
6588                     !bi->hasShrinkHeader &&
6589                     bi->blockState == YAFFS_BLOCK_STATE_FULL) {
6590                         yaffs_BlockBecameDirty(dev, blk);
6591                 }
6592
6593         }
6594
6595         if (altBlockIndex)
6596                 YFREE_ALT(blockIndex);
6597         else
6598                 YFREE(blockIndex);
6599
6600         /* Ok, we've done all the scanning.
6601          * Fix up the hard link chains.
6602          * We should now have scanned all the objects, now it's time to add these
6603          * hardlinks.
6604          */
6605         yaffs_HardlinkFixup(dev, hardList);
6606
6607
6608         yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
6609
6610         if (alloc_failed)
6611                 return YAFFS_FAIL;
6612
6613         T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
6614
6615         return YAFFS_OK;
6616 }
6617
6618 /*------------------------------  Directory Functions ----------------------------- */
6619
6620 static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
6621 {
6622         struct ylist_head *lh;
6623         yaffs_Object *listObj;
6624
6625         int count = 0;
6626
6627         if (!obj) {
6628                 T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
6629                 YBUG();
6630                 return;
6631         }
6632
6633         if (yaffs_SkipVerification(obj->myDev))
6634                 return;
6635
6636         if (!obj->parent) {
6637                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
6638                 YBUG();
6639                 return;
6640         }
6641
6642         if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6643                 T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
6644                 YBUG();
6645         }
6646
6647         /* Iterate through the objects in each hash entry */
6648
6649         ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
6650                 if (lh) {
6651                         listObj = ylist_entry(lh, yaffs_Object, siblings);
6652                         yaffs_VerifyObject(listObj);
6653                         if (obj == listObj)
6654                                 count++;
6655                 }
6656          }
6657
6658         if (count != 1) {
6659                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
6660                 YBUG();
6661         }
6662 }
6663
6664 static void yaffs_VerifyDirectory(yaffs_Object *directory)
6665 {
6666         struct ylist_head *lh;
6667         yaffs_Object *listObj;
6668
6669         if (!directory) {
6670                 YBUG();
6671                 return;
6672         }
6673
6674         if (yaffs_SkipFullVerification(directory->myDev))
6675                 return;
6676
6677         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6678                 T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
6679                 YBUG();
6680         }
6681
6682         /* Iterate through the objects in each hash entry */
6683
6684         ylist_for_each(lh, &directory->variant.directoryVariant.children) {
6685                 if (lh) {
6686                         listObj = ylist_entry(lh, yaffs_Object, siblings);
6687                         if (listObj->parent != directory) {
6688                                 T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
6689                                 YBUG();
6690                         }
6691                         yaffs_VerifyObjectInDirectory(listObj);
6692                 }
6693         }
6694 }
6695
6696 /*
6697  *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
6698  * link (ie. name) is created or deleted in the directory.
6699  *
6700  * ie.
6701  *   create dir/a : update dir's mtime/ctime
6702  *   rm dir/a:   update dir's mtime/ctime
6703  *   modify dir/a: don't update dir's mtimme/ctime
6704  */
6705
6706 static void yaffs_UpdateParent(yaffs_Object *obj)
6707 {
6708         if(!obj)
6709                 return;
6710
6711         obj->dirty = 1;
6712         obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
6713
6714         yaffs_UpdateObjectHeader(obj,NULL,0,0,0);
6715 }
6716
6717 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
6718 {
6719         yaffs_Device *dev = obj->myDev;
6720         yaffs_Object *parent;
6721
6722         yaffs_VerifyObjectInDirectory(obj);
6723         parent = obj->parent;
6724
6725         yaffs_VerifyDirectory(parent);
6726
6727         if (dev && dev->removeObjectCallback)
6728                 dev->removeObjectCallback(obj);
6729
6730
6731         ylist_del_init(&obj->siblings);
6732         obj->parent = NULL;
6733
6734         yaffs_VerifyDirectory(parent);
6735 }
6736
6737 static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
6738                                         yaffs_Object *obj)
6739 {
6740         if (!directory) {
6741                 T(YAFFS_TRACE_ALWAYS,
6742                   (TSTR
6743                    ("tragedy: Trying to add an object to a null pointer directory"
6744                     TENDSTR)));
6745                 YBUG();
6746                 return;
6747         }
6748         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6749                 T(YAFFS_TRACE_ALWAYS,
6750                   (TSTR
6751                    ("tragedy: Trying to add an object to a non-directory"
6752                     TENDSTR)));
6753                 YBUG();
6754         }
6755
6756         if (obj->siblings.prev == NULL) {
6757                 /* Not initialised */
6758                 YBUG();
6759         }
6760
6761
6762         yaffs_VerifyDirectory(directory);
6763
6764         yaffs_RemoveObjectFromDirectory(obj);
6765
6766
6767         /* Now add it */
6768         ylist_add(&obj->siblings, &directory->variant.directoryVariant.children);
6769         obj->parent = directory;
6770
6771         if (directory == obj->myDev->unlinkedDir
6772                         || directory == obj->myDev->deletedDir) {
6773                 obj->unlinked = 1;
6774                 obj->myDev->nUnlinkedFiles++;
6775                 obj->renameAllowed = 0;
6776         }
6777
6778         yaffs_VerifyDirectory(directory);
6779         yaffs_VerifyObjectInDirectory(obj);
6780 }
6781
6782 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,
6783                                      const YCHAR *name)
6784 {
6785         int sum;
6786
6787         struct ylist_head *i;
6788         YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
6789
6790         yaffs_Object *l;
6791
6792         if (!name)
6793                 return NULL;
6794
6795         if (!directory) {
6796                 T(YAFFS_TRACE_ALWAYS,
6797                   (TSTR
6798                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
6799                     TENDSTR)));
6800                 YBUG();
6801                 return NULL;
6802         }
6803         if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6804                 T(YAFFS_TRACE_ALWAYS,
6805                   (TSTR
6806                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6807                 YBUG();
6808         }
6809
6810         sum = yaffs_CalcNameSum(name);
6811
6812         ylist_for_each(i, &directory->variant.directoryVariant.children) {
6813                 if (i) {
6814                         l = ylist_entry(i, yaffs_Object, siblings);
6815
6816                         if (l->parent != directory)
6817                                 YBUG();
6818
6819                         yaffs_CheckObjectDetailsLoaded(l);
6820
6821                         /* Special case for lost-n-found */
6822                         if (l->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6823                                 if (yaffs_strcmp(name, YAFFS_LOSTNFOUND_NAME) == 0)
6824                                         return l;
6825                         } else if (yaffs_SumCompare(l->sum, sum) || l->hdrChunk <= 0) {
6826                                 /* LostnFound chunk called Objxxx
6827                                  * Do a real check
6828                                  */
6829                                 yaffs_GetObjectName(l, buffer,
6830                                                     YAFFS_MAX_NAME_LENGTH + 1);
6831                                 if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
6832                                         return l;
6833                         }
6834                 }
6835         }
6836
6837         return NULL;
6838 }
6839
6840
6841 #if 0
6842 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,
6843                                         int (*fn) (yaffs_Object *))
6844 {
6845         struct ylist_head *i;
6846         yaffs_Object *l;
6847
6848         if (!theDir) {
6849                 T(YAFFS_TRACE_ALWAYS,
6850                   (TSTR
6851                    ("tragedy: yaffs_FindObjectByName: null pointer directory"
6852                     TENDSTR)));
6853                 YBUG();
6854                 return YAFFS_FAIL;
6855         }
6856         if (theDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
6857                 T(YAFFS_TRACE_ALWAYS,
6858                   (TSTR
6859                    ("tragedy: yaffs_FindObjectByName: non-directory" TENDSTR)));
6860                 YBUG();
6861                 return YAFFS_FAIL;
6862         }
6863
6864         ylist_for_each(i, &theDir->variant.directoryVariant.children) {
6865                 if (i) {
6866                         l = ylist_entry(i, yaffs_Object, siblings);
6867                         if (l && !fn(l))
6868                                 return YAFFS_FAIL;
6869                 }
6870         }
6871
6872         return YAFFS_OK;
6873
6874 }
6875 #endif
6876
6877 /* GetEquivalentObject dereferences any hard links to get to the
6878  * actual object.
6879  */
6880
6881 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
6882 {
6883         if (obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
6884                 /* We want the object id of the equivalent object, not this one */
6885                 obj = obj->variant.hardLinkVariant.equivalentObject;
6886                 yaffs_CheckObjectDetailsLoaded(obj);
6887         }
6888         return obj;
6889 }
6890
6891 int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
6892 {
6893         memset(name, 0, buffSize * sizeof(YCHAR));
6894
6895         yaffs_CheckObjectDetailsLoaded(obj);
6896
6897         if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
6898                 yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
6899         } else if (obj->hdrChunk <= 0) {
6900                 YCHAR locName[20];
6901                 YCHAR numString[20];
6902                 YCHAR *x = &numString[19];
6903                 unsigned v = obj->objectId;
6904                 numString[19] = 0;
6905                 while (v > 0) {
6906                         x--;
6907                         *x = '0' + (v % 10);
6908                         v /= 10;
6909                 }
6910                 /* make up a name */
6911                 yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
6912                 yaffs_strcat(locName, x);
6913                 yaffs_strncpy(name, locName, buffSize - 1);
6914
6915         }
6916 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
6917         else if (obj->shortName[0])
6918                 yaffs_strcpy(name, obj->shortName);
6919 #endif
6920         else {
6921                 int result;
6922                 __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
6923
6924                 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *) buffer;
6925
6926                 memset(buffer, 0, obj->myDev->nDataBytesPerChunk);
6927
6928                 if (obj->hdrChunk > 0) {
6929                         result = yaffs_ReadChunkWithTagsFromNAND(obj->myDev,
6930                                                         obj->hdrChunk, buffer,
6931                                                         NULL);
6932                 }
6933                 yaffs_strncpy(name, oh->name, buffSize - 1);
6934
6935                 yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
6936         }
6937
6938         return yaffs_strlen(name);
6939 }
6940
6941 int yaffs_GetObjectFileLength(yaffs_Object *obj)
6942 {
6943         /* Dereference any hard linking */
6944         obj = yaffs_GetEquivalentObject(obj);
6945
6946         if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
6947                 return obj->variant.fileVariant.fileSize;
6948         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
6949                 return yaffs_strlen(obj->variant.symLinkVariant.alias);
6950         else {
6951                 /* Only a directory should drop through to here */
6952                 return obj->myDev->nDataBytesPerChunk;
6953         }
6954 }
6955
6956 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
6957 {
6958         int count = 0;
6959         struct ylist_head *i;
6960
6961         if (!obj->unlinked)
6962                 count++;                /* the object itself */
6963
6964         ylist_for_each(i, &obj->hardLinks)
6965                 count++;                /* add the hard links; */
6966
6967         return count;
6968 }
6969
6970 int yaffs_GetObjectInode(yaffs_Object *obj)
6971 {
6972         obj = yaffs_GetEquivalentObject(obj);
6973
6974         return obj->objectId;
6975 }
6976
6977 unsigned yaffs_GetObjectType(yaffs_Object *obj)
6978 {
6979         obj = yaffs_GetEquivalentObject(obj);
6980
6981         switch (obj->variantType) {
6982         case YAFFS_OBJECT_TYPE_FILE:
6983                 return DT_REG;
6984                 break;
6985         case YAFFS_OBJECT_TYPE_DIRECTORY:
6986                 return DT_DIR;
6987                 break;
6988         case YAFFS_OBJECT_TYPE_SYMLINK:
6989                 return DT_LNK;
6990                 break;
6991         case YAFFS_OBJECT_TYPE_HARDLINK:
6992                 return DT_REG;
6993                 break;
6994         case YAFFS_OBJECT_TYPE_SPECIAL:
6995                 if (S_ISFIFO(obj->yst_mode))
6996                         return DT_FIFO;
6997                 if (S_ISCHR(obj->yst_mode))
6998                         return DT_CHR;
6999                 if (S_ISBLK(obj->yst_mode))
7000                         return DT_BLK;
7001                 if (S_ISSOCK(obj->yst_mode))
7002                         return DT_SOCK;
7003         default:
7004                 return DT_REG;
7005                 break;
7006         }
7007 }
7008
7009 YCHAR *yaffs_GetSymlinkAlias(yaffs_Object *obj)
7010 {
7011         obj = yaffs_GetEquivalentObject(obj);
7012         if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
7013                 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
7014         else
7015                 return yaffs_CloneString(_Y(""));
7016 }
7017
7018 #ifndef CONFIG_YAFFS_WINCE
7019
7020 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
7021 {
7022         unsigned int valid = attr->ia_valid;
7023
7024         if (valid & ATTR_MODE)
7025                 obj->yst_mode = attr->ia_mode;
7026         if (valid & ATTR_UID)
7027                 obj->yst_uid = attr->ia_uid;
7028         if (valid & ATTR_GID)
7029                 obj->yst_gid = attr->ia_gid;
7030
7031         if (valid & ATTR_ATIME)
7032                 obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
7033         if (valid & ATTR_CTIME)
7034                 obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
7035         if (valid & ATTR_MTIME)
7036                 obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
7037
7038         if (valid & ATTR_SIZE)
7039                 yaffs_ResizeFile(obj, attr->ia_size);
7040
7041         yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
7042
7043         return YAFFS_OK;
7044
7045 }
7046 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
7047 {
7048         unsigned int valid = 0;
7049
7050         attr->ia_mode = obj->yst_mode;
7051         valid |= ATTR_MODE;
7052         attr->ia_uid = obj->yst_uid;
7053         valid |= ATTR_UID;
7054         attr->ia_gid = obj->yst_gid;
7055         valid |= ATTR_GID;
7056
7057         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
7058         valid |= ATTR_ATIME;
7059         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
7060         valid |= ATTR_CTIME;
7061         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
7062         valid |= ATTR_MTIME;
7063
7064         attr->ia_size = yaffs_GetFileSize(obj);
7065         valid |= ATTR_SIZE;
7066
7067         attr->ia_valid = valid;
7068
7069         return YAFFS_OK;
7070 }
7071
7072 #endif
7073
7074 #if 0
7075 int yaffs_DumpObject(yaffs_Object *obj)
7076 {
7077         YCHAR name[257];
7078
7079         yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
7080
7081         T(YAFFS_TRACE_ALWAYS,
7082           (TSTR
7083            ("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d"
7084             " chunk %d type %d size %d\n"
7085             TENDSTR), obj->objectId, yaffs_GetObjectInode(obj), name,
7086            obj->dirty, obj->valid, obj->serial, obj->sum, obj->hdrChunk,
7087            yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
7088
7089         return YAFFS_OK;
7090 }
7091 #endif
7092
7093 /*---------------------------- Initialisation code -------------------------------------- */
7094
7095 static int yaffs_CheckDevFunctions(const yaffs_Device *dev)
7096 {
7097
7098         /* Common functions, gotta have */
7099         if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
7100                 return 0;
7101
7102 #ifdef CONFIG_YAFFS_YAFFS2
7103
7104         /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
7105         if (dev->writeChunkWithTagsToNAND &&
7106             dev->readChunkWithTagsFromNAND &&
7107             !dev->writeChunkToNAND &&
7108             !dev->readChunkFromNAND &&
7109             dev->markNANDBlockBad && dev->queryNANDBlock)
7110                 return 1;
7111 #endif
7112
7113         /* Can use the "spare" style interface for yaffs1 */
7114         if (!dev->isYaffs2 &&
7115             !dev->writeChunkWithTagsToNAND &&
7116             !dev->readChunkWithTagsFromNAND &&
7117             dev->writeChunkToNAND &&
7118             dev->readChunkFromNAND &&
7119             !dev->markNANDBlockBad && !dev->queryNANDBlock)
7120                 return 1;
7121
7122         return 0;               /* bad */
7123 }
7124
7125
7126 static int yaffs_CreateInitialDirectories(yaffs_Device *dev)
7127 {
7128         /* Initialise the unlinked, deleted, root and lost and found directories */
7129
7130         dev->lostNFoundDir = dev->rootDir =  NULL;
7131         dev->unlinkedDir = dev->deletedDir = NULL;
7132
7133         dev->unlinkedDir =
7134             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
7135
7136         dev->deletedDir =
7137             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
7138
7139         dev->rootDir =
7140             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_ROOT,
7141                                       YAFFS_ROOT_MODE | S_IFDIR);
7142         dev->lostNFoundDir =
7143             yaffs_CreateFakeDirectory(dev, YAFFS_OBJECTID_LOSTNFOUND,
7144                                       YAFFS_LOSTNFOUND_MODE | S_IFDIR);
7145
7146         if (dev->lostNFoundDir && dev->rootDir && dev->unlinkedDir && dev->deletedDir) {
7147                 yaffs_AddObjectToDirectory(dev->rootDir, dev->lostNFoundDir);
7148                 return YAFFS_OK;
7149         }
7150
7151         return YAFFS_FAIL;
7152 }
7153
7154 int yaffs_GutsInitialise(yaffs_Device *dev)
7155 {
7156         int init_failed = 0;
7157         unsigned x;
7158         int bits;
7159
7160         T(YAFFS_TRACE_TRACING, (TSTR("yaffs: yaffs_GutsInitialise()" TENDSTR)));
7161
7162         /* Check stuff that must be set */
7163
7164         if (!dev) {
7165                 T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Need a device" TENDSTR)));
7166                 return YAFFS_FAIL;
7167         }
7168
7169         dev->internalStartBlock = dev->startBlock;
7170         dev->internalEndBlock = dev->endBlock;
7171         dev->blockOffset = 0;
7172         dev->chunkOffset = 0;
7173         dev->nFreeChunks = 0;
7174
7175         dev->gcBlock = -1;
7176
7177         if (dev->startBlock == 0) {
7178                 dev->internalStartBlock = dev->startBlock + 1;
7179                 dev->internalEndBlock = dev->endBlock + 1;
7180                 dev->blockOffset = 1;
7181                 dev->chunkOffset = dev->nChunksPerBlock;
7182         }
7183
7184         /* Check geometry parameters. */
7185
7186         if ((!dev->inbandTags && dev->isYaffs2 && dev->totalBytesPerChunk < 1024) ||
7187             (!dev->isYaffs2 && dev->totalBytesPerChunk < 512) ||
7188             (dev->inbandTags && !dev->isYaffs2) ||
7189              dev->nChunksPerBlock < 2 ||
7190              dev->nReservedBlocks < 2 ||
7191              dev->internalStartBlock <= 0 ||
7192              dev->internalEndBlock <= 0 ||
7193              dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2)) {   /* otherwise it is too small */
7194                 T(YAFFS_TRACE_ALWAYS,
7195                   (TSTR
7196                    ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
7197                     TENDSTR), dev->totalBytesPerChunk, dev->isYaffs2 ? "2" : "", dev->inbandTags));
7198                 return YAFFS_FAIL;
7199         }
7200
7201         if (yaffs_InitialiseNAND(dev) != YAFFS_OK) {
7202                 T(YAFFS_TRACE_ALWAYS,
7203                   (TSTR("yaffs: InitialiseNAND failed" TENDSTR)));
7204                 return YAFFS_FAIL;
7205         }
7206
7207         /* Sort out space for inband tags, if required */
7208         if (dev->inbandTags)
7209                 dev->nDataBytesPerChunk = dev->totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
7210         else
7211                 dev->nDataBytesPerChunk = dev->totalBytesPerChunk;
7212
7213         /* Got the right mix of functions? */
7214         if (!yaffs_CheckDevFunctions(dev)) {
7215                 /* Function missing */
7216                 T(YAFFS_TRACE_ALWAYS,
7217                   (TSTR
7218                    ("yaffs: device function(s) missing or wrong\n" TENDSTR)));
7219
7220                 return YAFFS_FAIL;
7221         }
7222
7223         /* This is really a compilation check. */
7224         if (!yaffs_CheckStructures()) {
7225                 T(YAFFS_TRACE_ALWAYS,
7226                   (TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
7227                 return YAFFS_FAIL;
7228         }
7229
7230         if (dev->isMounted) {
7231                 T(YAFFS_TRACE_ALWAYS,
7232                   (TSTR("yaffs: device already mounted\n" TENDSTR)));
7233                 return YAFFS_FAIL;
7234         }
7235
7236         /* Finished with most checks. One or two more checks happen later on too. */
7237
7238         dev->isMounted = 1;
7239
7240         /* OK now calculate a few things for the device */
7241
7242         /*
7243          *  Calculate all the chunk size manipulation numbers:
7244          */
7245         x = dev->nDataBytesPerChunk;
7246         /* We always use dev->chunkShift and dev->chunkDiv */
7247         dev->chunkShift = Shifts(x);
7248         x >>= dev->chunkShift;
7249         dev->chunkDiv = x;
7250         /* We only use chunk mask if chunkDiv is 1 */
7251         dev->chunkMask = (1<<dev->chunkShift) - 1;
7252
7253         /*
7254          * Calculate chunkGroupBits.
7255          * We need to find the next power of 2 > than internalEndBlock
7256          */
7257
7258         x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
7259
7260         bits = ShiftsGE(x);
7261
7262         /* Set up tnode width if wide tnodes are enabled. */
7263         if (!dev->wideTnodesDisabled) {
7264                 /* bits must be even so that we end up with 32-bit words */
7265                 if (bits & 1)
7266                         bits++;
7267                 if (bits < 16)
7268                         dev->tnodeWidth = 16;
7269                 else
7270                         dev->tnodeWidth = bits;
7271         } else
7272                 dev->tnodeWidth = 16;
7273
7274         dev->tnodeMask = (1<<dev->tnodeWidth)-1;
7275
7276         /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
7277          * so if the bitwidth of the
7278          * chunk range we're using is greater than 16 we need
7279          * to figure out chunk shift and chunkGroupSize
7280          */
7281
7282         if (bits <= dev->tnodeWidth)
7283                 dev->chunkGroupBits = 0;
7284         else
7285                 dev->chunkGroupBits = bits - dev->tnodeWidth;
7286
7287
7288         dev->chunkGroupSize = 1 << dev->chunkGroupBits;
7289
7290         if (dev->nChunksPerBlock < dev->chunkGroupSize) {
7291                 /* We have a problem because the soft delete won't work if
7292                  * the chunk group size > chunks per block.
7293                  * This can be remedied by using larger "virtual blocks".
7294                  */
7295                 T(YAFFS_TRACE_ALWAYS,
7296                   (TSTR("yaffs: chunk group too large\n" TENDSTR)));
7297
7298                 return YAFFS_FAIL;
7299         }
7300
7301         /* OK, we've finished verifying the device, lets continue with initialisation */
7302
7303         /* More device initialisation */
7304         dev->garbageCollections = 0;
7305         dev->passiveGarbageCollections = 0;
7306         dev->currentDirtyChecker = 0;
7307         dev->bufferedBlock = -1;
7308         dev->doingBufferedBlockRewrite = 0;
7309         dev->nDeletedFiles = 0;
7310         dev->nBackgroundDeletions = 0;
7311         dev->nUnlinkedFiles = 0;
7312         dev->eccFixed = 0;
7313         dev->eccUnfixed = 0;
7314         dev->tagsEccFixed = 0;
7315         dev->tagsEccUnfixed = 0;
7316         dev->nErasureFailures = 0;
7317         dev->nErasedBlocks = 0;
7318         dev->isDoingGC = 0;
7319         dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
7320
7321         /* Initialise temporary buffers and caches. */
7322         if (!yaffs_InitialiseTempBuffers(dev))
7323                 init_failed = 1;
7324
7325         dev->srCache = NULL;
7326         dev->gcCleanupList = NULL;
7327
7328
7329         if (!init_failed &&
7330             dev->nShortOpCaches > 0) {
7331                 int i;
7332                 void *buf;
7333                 int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
7334
7335                 if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
7336                         dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
7337
7338                 dev->srCache =  YMALLOC(srCacheBytes);
7339
7340                 buf = (__u8 *) dev->srCache;
7341
7342                 if (dev->srCache)
7343                         memset(dev->srCache, 0, srCacheBytes);
7344
7345                 for (i = 0; i < dev->nShortOpCaches && buf; i++) {
7346                         dev->srCache[i].object = NULL;
7347                         dev->srCache[i].lastUse = 0;
7348                         dev->srCache[i].dirty = 0;
7349                         dev->srCache[i].data = buf = YMALLOC_DMA(dev->totalBytesPerChunk);
7350                 }
7351                 if (!buf)
7352                         init_failed = 1;
7353
7354                 dev->srLastUse = 0;
7355         }
7356
7357         dev->cacheHits = 0;
7358
7359         if (!init_failed) {
7360                 dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
7361                 if (!dev->gcCleanupList)
7362                         init_failed = 1;
7363         }
7364
7365         if (dev->isYaffs2)
7366                 dev->useHeaderFileSize = 1;
7367
7368         if (!init_failed && !yaffs_InitialiseBlocks(dev))
7369                 init_failed = 1;
7370
7371         yaffs_InitialiseTnodes(dev);
7372         yaffs_InitialiseObjects(dev);
7373
7374         if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7375                 init_failed = 1;
7376
7377
7378         if (!init_failed) {
7379                 /* Now scan the flash. */
7380                 if (dev->isYaffs2) {
7381                         if (yaffs_CheckpointRestore(dev)) {
7382                                 yaffs_CheckObjectDetailsLoaded(dev->rootDir);
7383                                 T(YAFFS_TRACE_ALWAYS,
7384                                   (TSTR("yaffs: restored from checkpoint" TENDSTR)));
7385                         } else {
7386
7387                                 /* Clean up the mess caused by an aborted checkpoint load
7388                                  * and scan backwards.
7389                                  */
7390                                 yaffs_DeinitialiseBlocks(dev);
7391                                 yaffs_DeinitialiseTnodes(dev);
7392                                 yaffs_DeinitialiseObjects(dev);
7393
7394
7395                                 dev->nErasedBlocks = 0;
7396                                 dev->nFreeChunks = 0;
7397                                 dev->allocationBlock = -1;
7398                                 dev->allocationPage = -1;
7399                                 dev->nDeletedFiles = 0;
7400                                 dev->nUnlinkedFiles = 0;
7401                                 dev->nBackgroundDeletions = 0;
7402                                 dev->oldestDirtySequence = 0;
7403
7404                                 if (!init_failed && !yaffs_InitialiseBlocks(dev))
7405                                         init_failed = 1;
7406
7407                                 yaffs_InitialiseTnodes(dev);
7408                                 yaffs_InitialiseObjects(dev);
7409
7410                                 if (!init_failed && !yaffs_CreateInitialDirectories(dev))
7411                                         init_failed = 1;
7412
7413                                 if (!init_failed && !yaffs_ScanBackwards(dev))
7414                                         init_failed = 1;
7415                         }
7416                 } else if (!yaffs_Scan(dev))
7417                                 init_failed = 1;
7418
7419                 yaffs_StripDeletedObjects(dev);
7420         }
7421
7422         if (init_failed) {
7423                 /* Clean up the mess */
7424                 T(YAFFS_TRACE_TRACING,
7425                   (TSTR("yaffs: yaffs_GutsInitialise() aborted.\n" TENDSTR)));
7426
7427                 yaffs_Deinitialise(dev);
7428                 return YAFFS_FAIL;
7429         }
7430
7431         /* Zero out stats */
7432         dev->nPageReads = 0;
7433         dev->nPageWrites = 0;
7434         dev->nBlockErasures = 0;
7435         dev->nGCCopies = 0;
7436         dev->nRetriedWrites = 0;
7437
7438         dev->nRetiredBlocks = 0;
7439
7440         yaffs_VerifyFreeChunks(dev);
7441         yaffs_VerifyBlocks(dev);
7442
7443
7444         T(YAFFS_TRACE_TRACING,
7445           (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
7446         return YAFFS_OK;
7447
7448 }
7449
7450 void yaffs_Deinitialise(yaffs_Device *dev)
7451 {
7452         if (dev->isMounted) {
7453                 int i;
7454
7455                 yaffs_DeinitialiseBlocks(dev);
7456                 yaffs_DeinitialiseTnodes(dev);
7457                 yaffs_DeinitialiseObjects(dev);
7458                 if (dev->nShortOpCaches > 0 &&
7459                     dev->srCache) {
7460
7461                         for (i = 0; i < dev->nShortOpCaches; i++) {
7462                                 if (dev->srCache[i].data)
7463                                         YFREE(dev->srCache[i].data);
7464                                 dev->srCache[i].data = NULL;
7465                         }
7466
7467                         YFREE(dev->srCache);
7468                         dev->srCache = NULL;
7469                 }
7470
7471                 YFREE(dev->gcCleanupList);
7472
7473                 for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++)
7474                         YFREE(dev->tempBuffer[i].buffer);
7475
7476                 dev->isMounted = 0;
7477
7478                 if (dev->deinitialiseNAND)
7479                         dev->deinitialiseNAND(dev);
7480         }
7481 }
7482
7483 static int yaffs_CountFreeChunks(yaffs_Device *dev)
7484 {
7485         int nFree;
7486         int b;
7487
7488         yaffs_BlockInfo *blk;
7489
7490         for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
7491                         b++) {
7492                 blk = yaffs_GetBlockInfo(dev, b);
7493
7494                 switch (blk->blockState) {
7495                 case YAFFS_BLOCK_STATE_EMPTY:
7496                 case YAFFS_BLOCK_STATE_ALLOCATING:
7497                 case YAFFS_BLOCK_STATE_COLLECTING:
7498                 case YAFFS_BLOCK_STATE_FULL:
7499                         nFree +=
7500                             (dev->nChunksPerBlock - blk->pagesInUse +
7501                              blk->softDeletions);
7502                         break;
7503                 default:
7504                         break;
7505                 }
7506         }
7507
7508         return nFree;
7509 }
7510
7511 int yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
7512 {
7513         /* This is what we report to the outside world */
7514
7515         int nFree;
7516         int nDirtyCacheChunks;
7517         int blocksForCheckpoint;
7518         int i;
7519
7520 #if 1
7521         nFree = dev->nFreeChunks;
7522 #else
7523         nFree = yaffs_CountFreeChunks(dev);
7524 #endif
7525
7526         nFree += dev->nDeletedFiles;
7527
7528         /* Now count the number of dirty chunks in the cache and subtract those */
7529
7530         for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
7531                 if (dev->srCache[i].dirty)
7532                         nDirtyCacheChunks++;
7533         }
7534
7535         nFree -= nDirtyCacheChunks;
7536
7537         nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
7538
7539         /* Now we figure out how much to reserve for the checkpoint and report that... */
7540         blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
7541         if (blocksForCheckpoint < 0)
7542                 blocksForCheckpoint = 0;
7543
7544         nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
7545
7546         if (nFree < 0)
7547                 nFree = 0;
7548
7549         return nFree;
7550
7551 }
7552
7553 static int yaffs_freeVerificationFailures;
7554
7555 static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
7556 {
7557         int counted;
7558         int difference;
7559
7560         if (yaffs_SkipVerification(dev))
7561                 return;
7562
7563         counted = yaffs_CountFreeChunks(dev);
7564
7565         difference = dev->nFreeChunks - counted;
7566
7567         if (difference) {
7568                 T(YAFFS_TRACE_ALWAYS,
7569                   (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
7570                    dev->nFreeChunks, counted, difference));
7571                 yaffs_freeVerificationFailures++;
7572         }
7573 }
7574
7575 /*---------------------------------------- YAFFS test code ----------------------*/
7576
7577 #define yaffs_CheckStruct(structure, syze, name) \
7578         do { \
7579                 if (sizeof(structure) != syze) { \
7580                         T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
7581                                 name, syze, sizeof(structure))); \
7582                         return YAFFS_FAIL; \
7583                 } \
7584         } while (0)
7585
7586 static int yaffs_CheckStructures(void)
7587 {
7588 /*      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
7589 /*      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
7590 /*      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
7591 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
7592         yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode");
7593 #endif
7594 #ifndef CONFIG_YAFFS_WINCE
7595         yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");
7596 #endif
7597         return YAFFS_OK;
7598 }