yaffs_guts.c

   1 /*
   2  * YAFFS: Yet another FFS. A NAND-flash specific file system.
   3  * yaffs_guts.c  The main guts of YAFFS
   4  *
   5  * Copyright (C) 2002 Aleph One Ltd.
   6  *   for Toby Churchill Ltd and Brightstar Engineering
   7  *
   8  * Created by Charles Manning <charles@aleph1.co.uk>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  */
  15  //yaffs_guts.c
  16
  17 const char *yaffs_guts_c_version="$Id: yaffs_guts.c,v 1.26 2003-05-20 23:20:53 charles Exp $";
  18
  19 #include "yportenv.h"
  20
  21 #include "yaffsinterface.h"
  22 #include "yaffs_guts.h"
  23
  24 #define YAFFS_PASSIVE_GC_CHUNKS 2
  25
  26 #if 0
  27 // Use Steven Hill's ECC struff instead
  28 // External functions for ECC on data
  29 void nand_calculate_ecc (const u_char *dat, u_char *ecc_code);
  30 int nand_correct_data (u_char *dat, u_char *read_ecc, u_char *calc_ecc);
  31 #define yaffs_ECCCalculate(data,ecc) nand_calculate_ecc(data,ecc)
  32 #define yaffs_ECCCorrect(data,read_ecc,calc_ecc) nand_correct_ecc(data,read_ecc,calc_ecc)
  33 #else
  34 #include "yaffs_ecc.h"
  35 #endif
  36
  37 // countBits is a quick way of counting the number of bits in a byte.
  38 // ie. countBits[n] holds the number of 1 bits in a byte with the value n.
  39
  40 static const char yaffs_countBitsTable[256] =
  41 {
  42 0,1,1,2,1,2,2,3,1,2,2,3,2,3,3,4,
  43 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
  44 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
  45 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  46 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
  47 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  48 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  49 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
  50 1,2,2,3,2,3,3,4,2,3,3,4,3,4,4,5,
  51 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  52 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  53 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
  54 2,3,3,4,3,4,4,5,3,4,4,5,4,5,5,6,
  55 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
  56 3,4,4,5,4,5,5,6,4,5,5,6,5,6,6,7,
  57 4,5,5,6,5,6,6,7,5,6,6,7,6,7,7,8
  58 };
  59
  60 static int yaffs_CountBits(__u8 x)
  61 {
  62         int retVal;
  63         retVal = yaffs_countBitsTable[x];
  64         return retVal;
  65 }
  66
  67
  68
  69 // Local prototypes
  70 static int yaffs_CheckObjectHashSanity(yaffs_Device *dev);
  71 static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr);
  72 static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr);
  73 static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan);
  74
  75 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type);
  76 static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj);
  77 static int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name, int force);
  78 static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId,int markNAND);
  79 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
  80 static int yaffs_CheckStructures(void);
  81 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit);
  82 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
  83
  84 static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev,int blockNo);
  85
  86 // Robustification
  87 static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND);
  88 static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND);
  89 static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND);
  90 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare);
  91 static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_Spare *spare);
  92
  93 static int  yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND);
  94
  95 static int yaffs_UnlinkWorker(yaffs_Object *obj);
  96 static void yaffs_AbortHalfCreatedObject(yaffs_Object *obj);
  97
  98 static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1);
  99
 100
 101
 102 loff_t yaffs_GetFileSize(yaffs_Object *obj);
 103
 104 static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted);
 105 static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted);
 106
 107
 108 static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve);
 109
 110 #ifdef YAFFS_PARANOID
 111 static int yaffs_CheckFileSanity(yaffs_Object *in);
 112 #else
 113 #define yaffs_CheckFileSanity(in)
 114 #endif
 115
 116 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
 117 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
 118
 119 // Chunk bitmap manipulations
 120
 121 static __inline __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
 122 {
 123         if(blk < dev->startBlock || blk > dev->endBlock)
 124         {
 125                 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),blk));
 126                 YBUG();
 127         }
 128         return dev->chunkBits + (dev->chunkBitmapStride * (blk - dev->startBlock));
 129 }
 130
 131 static __inline__ void yaffs_ClearChunkBits(yaffs_Device *dev,int blk)
 132 {
 133         __u8 *blkBits = yaffs_BlockBits(dev,blk);
 134
 135          memset(blkBits,0,dev->chunkBitmapStride);
 136 }
 137
 138 static __inline__ void yaffs_ClearChunkBit(yaffs_Device *dev,int blk,int chunk)
 139 {
 140         __u8 *blkBits = yaffs_BlockBits(dev,blk);
 141
 142         blkBits[chunk/8] &=  ~ (1<<(chunk & 7));
 143 }
 144
 145 static __inline__ void yaffs_SetChunkBit(yaffs_Device *dev,int blk,int chunk)
 146 {
 147         __u8 *blkBits = yaffs_BlockBits(dev,blk);
 148
 149         blkBits[chunk/8] |=   (1<<(chunk & 7));
 150 }
 151
 152 static __inline__ int yaffs_CheckChunkBit(yaffs_Device *dev,int blk,int chunk)
 153 {
 154         __u8 *blkBits = yaffs_BlockBits(dev,blk);
 155         return (blkBits[chunk/8] &  (1<<(chunk & 7))) ? 1 :0;
 156 }
 157
 158 static __inline__ int yaffs_StillSomeChunkBits(yaffs_Device *dev,int blk)
 159 {
 160         __u8 *blkBits = yaffs_BlockBits(dev,blk);
 161         int i;
 162         for(i = 0; i < dev->chunkBitmapStride; i++)
 163         {
 164                 if(*blkBits) return 1;
 165                 blkBits++;
 166         }
 167         return 0;
 168 }
 169
 170 // Function to manipulate block info
 171 static  __inline__ yaffs_BlockInfo* yaffs_GetBlockInfo(yaffs_Device *dev, int blk)
 172 {
 173         if(blk < dev->startBlock || blk > dev->endBlock)
 174         {
 175                 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs: getBlockInfo block %d is not valid" TENDSTR),blk));
 176                 YBUG();
 177         }
 178         return &dev->blockInfo[blk - dev->startBlock];
 179 }
 180
 181
 182 static  __inline__ int yaffs_HashFunction(int n)
 183 {
 184         return (n % YAFFS_NOBJECT_BUCKETS);
 185 }
 186
 187
 188 yaffs_Object *yaffs_Root(yaffs_Device *dev)
 189 {
 190         return dev->rootDir;
 191 }
 192
 193 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
 194 {
 195         return dev->lostNFoundDir;
 196 }
 197
 198
 199 static int yaffs_WriteChunkToNAND(struct yaffs_DeviceStruct *dev,int chunkInNAND, const __u8 *data, yaffs_Spare *spare)
 200 {
 201         if(chunkInNAND < dev->startBlock * dev->nChunksPerBlock)
 202         {
 203                 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d is not valid" TENDSTR),chunkInNAND));
 204                 return YAFFS_FAIL;
 205         }
 206
 207         dev->nPageWrites++;
 208         return dev->writeChunkToNAND(dev,chunkInNAND,data,spare);
 209 }
 210
 211
 212
 213 int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,
 214                                                         int chunkInNAND,
 215                                                         __u8 *data,
 216                                                         yaffs_Spare *spare,
 217                                                         int doErrorCorrection)
 218 {
 219         int retVal;
 220         yaffs_Spare localSpare;
 221
 222         dev->nPageReads++;
 223
 224
 225
 226
 227         if(!spare && data)
 228         {
 229                 // If we don't have a real spare, then we use a local one.
 230                 // Need this for the calculation of the ecc
 231                 spare = &localSpare;
 232         }
 233
 234
 235         if(!dev->useNANDECC)
 236         {
 237                 retVal  = dev->readChunkFromNAND(dev,chunkInNAND,data,spare);
 238                 if(data && doErrorCorrection)
 239                 {
 240                         // Do ECC correction
 241                         //Todo handle any errors
 242                 int eccResult1,eccResult2;
 243                 __u8 calcEcc[3];
 244
 245                         yaffs_ECCCalculate(data,calcEcc);
 246                         eccResult1 = yaffs_ECCCorrect (data,spare->ecc1, calcEcc);
 247                         yaffs_ECCCalculate(&data[256],calcEcc);
 248                         eccResult2 = yaffs_ECCCorrect(&data[256],spare->ecc2, calcEcc);
 249
 250                         if(eccResult1>0)
 251                         {
 252                                 T(YAFFS_TRACE_ERROR, (TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND));
 253                                 dev->eccFixed++;
 254                         }
 255                         else if(eccResult1<0)
 256                         {
 257                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND));
 258                                 dev->eccUnfixed++;
 259                         }
 260
 261                         if(eccResult2>0)
 262                         {
 263                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND));
 264                                 dev->eccFixed++;
 265                         }
 266                         else if(eccResult2<0)
 267                         {
 268                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND));
 269                                 dev->eccUnfixed++;
 270                         }
 271
 272                         if(eccResult1 || eccResult2)
 273                         {
 274                                 // Hoosterman, we had a data problem on this page
 275                                 yaffs_HandleReadDataError(dev,chunkInNAND);
 276                         }
 277                 }
 278         }
 279         else
 280         {
 281         // Must allocate enough memory for spare+2*sizeof(int) for ecc results from device.
 282         struct yaffs_NANDSpare nspare;
 283                 retVal  = dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare*)&nspare);
 284                 memcpy (spare, &nspare, sizeof(yaffs_Spare));
 285                 if(data && doErrorCorrection)
 286                 {
 287                         if(nspare.eccres1>0)
 288                         {
 289                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:0" TENDSTR),chunkInNAND));
 290                         }
 291                         else if(nspare.eccres1<0)
 292                         {
 293                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND));
 294                         }
 295
 296                         if(nspare.eccres2>0)
 297                         {
 298                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND));
 299                         }
 300                         else if(nspare.eccres2<0)
 301                         {
 302                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND));
 303                         }
 304
 305                         if(nspare.eccres1 || nspare.eccres2)
 306                         {
 307                                 // Hoosterman, we had a data problem on this page
 308                                 yaffs_HandleReadDataError(dev,chunkInNAND);
 309                         }
 310
 311                 }
 312         }
 313         return retVal;
 314 }
 315
 316
 317 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,int chunkInNAND)
 318 {
 319
 320         static int init = 0;
 321         static __u8 cmpbuf[YAFFS_BYTES_PER_CHUNK];
 322         static __u8 data[YAFFS_BYTES_PER_CHUNK];
 323     // Might as well always allocate the larger size for dev->useNANDECC == true;
 324         static __u8 spare[sizeof(struct yaffs_NANDSpare)];
 325
 326         dev->readChunkFromNAND(dev,chunkInNAND,data,(yaffs_Spare *)spare);
 327
 328         if(!init)
 329         {
 330                 memset(cmpbuf,0xff,YAFFS_BYTES_PER_CHUNK);
 331                 init = 1;
 332         }
 333
 334         if(memcmp(cmpbuf,data,YAFFS_BYTES_PER_CHUNK)) return  YAFFS_FAIL;
 335         if(memcmp(cmpbuf,spare,16)) return YAFFS_FAIL;
 336
 337
 338         return YAFFS_OK;
 339
 340 }
 341
 342
 343
 344 int yaffs_EraseBlockInNAND(struct yaffs_DeviceStruct *dev,int blockInNAND)
 345 {
 346         dev->nBlockErasures++;
 347         return dev->eraseBlockInNAND(dev,blockInNAND);
 348 }
 349
 350 int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
 351 {
 352         return dev->initialiseNAND(dev);
 353 }
 354
 355 static int yaffs_WriteNewChunkToNAND(struct yaffs_DeviceStruct *dev, const __u8 *data, yaffs_Spare *spare,int useReserve)
 356 {
 357         int chunk;
 358
 359         int writeOk = 1;
 360         int attempts = 0;
 361
 362         unsigned char rbData[YAFFS_BYTES_PER_CHUNK];
 363         yaffs_Spare rbSpare;
 364
 365         do{
 366                 chunk = yaffs_AllocateChunk(dev,useReserve);
 367
 368                 if(chunk >= 0)
 369                 {
 370
 371                         // First check this chunk is erased...
 372 #ifndef CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
 373                         writeOk = yaffs_CheckChunkErased(dev,chunk);
 374 #endif
 375                         if(!writeOk)
 376                         {
 377                                 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs chunk %d was not erased" TENDSTR),chunk));
 378                         }
 379                         else
 380                         {
 381                                 writeOk =  yaffs_WriteChunkToNAND(dev,chunk,data,spare);
 382                         }
 383                         attempts++;
 384                         if(writeOk)
 385                         {
 386                                 // Readback & verify
 387                                 // If verify fails, then delete this chunk and try again
 388                                 // To verify we compare everything except the block and
 389                                 // page status bytes.
 390                                 // NB We check a raw read without ECC correction applied
 391                                 yaffs_ReadChunkFromNAND(dev,chunk,rbData,&rbSpare,0);
 392
 393 #ifndef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
 394                                 if(!yaffs_VerifyCompare(data,rbData,spare,&rbSpare))
 395                                 {
 396                                         // Didn't verify
 397                                         T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write verify failed on chunk %d" TENDSTR), chunk));
 398
 399                                         writeOk = 0;
 400                                 }
 401 #endif
 402
 403                         }
 404                         if(writeOk)
 405                         {
 406                                 // Copy the data into the write buffer.
 407                                 // NB We do this at the end to prevent duplicates in the case of a write error.
 408                                 //Todo
 409                                 yaffs_HandleWriteChunkOk(dev,chunk,data,spare);
 410                         }
 411                         else
 412                         {
 413                                 yaffs_HandleWriteChunkError(dev,chunk);
 414                         }
 415                 }
 416
 417         } while(chunk >= 0 && ! writeOk);
 418
 419         if(attempts > 1)
 420         {
 421                 T(YAFFS_TRACE_ERROR,(TSTR("**>> yaffs write required %d attempts" TENDSTR),attempts));
 422                 dev->nRetriedWrites+= (attempts - 1);
 423         }
 424
 425         return chunk;
 426 }
 427
 428 ///
 429 // Functions for robustisizing
 430 //
 431 //
 432
 433 static void yaffs_RetireBlock(yaffs_Device *dev,int blockInNAND)
 434 {
 435         // Ding the blockStatus in the first two pages of the block.
 436
 437         yaffs_Spare spare;
 438
 439         memset(&spare, 0xff,sizeof(yaffs_Spare));
 440
 441         spare.blockStatus = 0;
 442
 443         // TODO change this retirement marking for other NAND types
 444         yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock, NULL , &spare);
 445         yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock + 1, NULL , &spare);
 446
 447         yaffs_GetBlockInfo(dev,blockInNAND)->blockState = YAFFS_BLOCK_STATE_DEAD;
 448         dev->nRetiredBlocks++;
 449 }
 450
 451
 452
 453 static int yaffs_RewriteBufferedBlock(yaffs_Device *dev)
 454 {
 455         dev->doingBufferedBlockRewrite = 1;
 456         //
 457         //      Remove erased chunks
 458         //  Rewrite existing chunks to a new block
 459         //      Set current write block to the new block
 460
 461         dev->doingBufferedBlockRewrite = 0;
 462
 463         return 1;
 464 }
 465
 466
 467 static void yaffs_HandleReadDataError(yaffs_Device *dev,int chunkInNAND)
 468 {
 469         int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
 470
 471         // Mark the block for retirement
 472         yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
 473         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>>Block %d marked for retirement" TENDSTR),blockInNAND));
 474
 475
 476         //TODO
 477         // Just do a garbage collection on the affected block then retire the block
 478         // NB recursion
 479 }
 480
 481
 482 static void yaffs_CheckWrittenBlock(yaffs_Device *dev,int chunkInNAND)
 483 {
 484 }
 485
 486 static void yaffs_HandleWriteChunkOk(yaffs_Device *dev,int chunkInNAND,const __u8 *data, const yaffs_Spare *spare)
 487 {
 488 }
 489
 490 static void yaffs_HandleUpdateChunk(yaffs_Device *dev,int chunkInNAND, const yaffs_Spare *spare)
 491 {
 492 }
 493
 494 static void yaffs_HandleWriteChunkError(yaffs_Device *dev,int chunkInNAND)
 495 {
 496         int blockInNAND = chunkInNAND/dev->nChunksPerBlock;
 497
 498         // Mark the block for retirement
 499         yaffs_GetBlockInfo(dev,blockInNAND)->needsRetiring = 1;
 500         // Delete the chunk
 501         yaffs_DeleteChunk(dev,chunkInNAND,1);
 502 }
 503
 504
 505
 506
 507 static int yaffs_VerifyCompare(const __u8 *d0, const __u8 * d1, const yaffs_Spare *s0, const yaffs_Spare *s1)
 508 {
 509
 510
 511         if( memcmp(d0,d1,YAFFS_BYTES_PER_CHUNK) != 0 ||
 512                 s0->tagByte0 != s1->tagByte0 ||
 513                 s0->tagByte1 != s1->tagByte1 ||
 514                 s0->tagByte2 != s1->tagByte2 ||
 515                 s0->tagByte3 != s1->tagByte3 ||
 516                 s0->tagByte4 != s1->tagByte4 ||
 517                 s0->tagByte5 != s1->tagByte5 ||
 518                 s0->tagByte6 != s1->tagByte6 ||
 519                 s0->tagByte7 != s1->tagByte7 ||
 520                 s0->ecc1[0]  != s1->ecc1[0]  ||
 521                 s0->ecc1[1]  != s1->ecc1[1]  ||
 522                 s0->ecc1[2]  != s1->ecc1[2]  ||
 523                 s0->ecc2[0]  != s1->ecc2[0]  ||
 524                 s0->ecc2[1]  != s1->ecc2[1]  ||
 525                 s0->ecc2[2]  != s1->ecc2[2] )
 526                 {
 527                         return 0;
 528                 }
 529
 530         return 1;
 531 }
 532
 533
 534 ///////////////////////// Object management //////////////////
 535 // List of spare objects
 536 // The list is hooked together using the first pointer
 537 // in the object
 538
 539 // static yaffs_Object *yaffs_freeObjects = NULL;
 540
 541 // static int yaffs_nFreeObjects;
 542
 543 // static yaffs_ObjectList *yaffs_allocatedObjectList = NULL;
 544
 545 // static yaffs_ObjectBucket yaffs_objectBucket[YAFFS_NOBJECT_BUCKETS];
 546
 547
 548 static __u16 yaffs_CalcNameSum(const char *name)
 549 {
 550         __u16 sum = 0;
 551         __u16 i = 1;
 552
 553         __u8 *bname = (__u8 *)name;
 554         if(bname)
 555         {
 556                 while ((*bname) && (i <=YAFFS_MAX_NAME_LENGTH))
 557                 {
 558
 559 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
 560                         sum += toupper(*bname) * i;
 561 #else
 562                         sum += (*bname) * i;
 563 #endif
 564                         i++;
 565                         bname++;
 566                 }
 567         }
 568         return sum;
 569 }
 570
 571 void yaffs_SetObjectName(yaffs_Object *obj, const char *name)
 572 {
 573 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
 574                                         if(name && strlen(name) <= YAFFS_SHORT_NAME_LENGTH)
 575                                         {
 576                                                 strcpy(obj->shortName,name);
 577                                         }
 578                                         else
 579                                         {
 580                                                 obj->shortName[0]='\0';
 581                                         }
 582 #endif
 583                                         obj->sum = yaffs_CalcNameSum(name);
 584 }
 585
 586 void yaffs_CalcECC(const __u8 *data, yaffs_Spare *spare)
 587 {
 588         yaffs_ECCCalculate(data , spare->ecc1);
 589         yaffs_ECCCalculate(&data[256] , spare->ecc2);
 590 }
 591
 592 void yaffs_CalcTagsECC(yaffs_Tags *tags)
 593 {
 594         // Calculate an ecc
 595
 596         unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
 597         unsigned  i,j;
 598         unsigned  ecc = 0;
 599         unsigned bit = 0;
 600
 601         tags->ecc = 0;
 602
 603         for(i = 0; i < 8; i++)
 604         {
 605                 for(j = 1; j &0xff; j<<=1)
 606                 {
 607                         bit++;
 608                         if(b[i] & j)
 609                         {
 610                                 ecc ^= bit;
 611                         }
 612                 }
 613         }
 614
 615         tags->ecc = ecc;
 616
 617
 618 }
 619
 620 int  yaffs_CheckECCOnTags(yaffs_Tags *tags)
 621 {
 622         unsigned ecc = tags->ecc;
 623
 624         yaffs_CalcTagsECC(tags);
 625
 626         ecc ^= tags->ecc;
 627
 628         if(ecc && ecc <= 64)
 629         {
 630                 // TODO: Handle the failure better. Retire?
 631                 unsigned char *b = ((yaffs_TagsUnion *)tags)->asBytes;
 632
 633                 ecc--;
 634
 635                 b[ecc / 8] ^= (1 << (ecc & 7));
 636
 637                 // Now recvalc the ecc
 638                 yaffs_CalcTagsECC(tags);
 639
 640                 return 1; // recovered error
 641         }
 642         else if(ecc)
 643         {
 644                 // Wierd ecc failure value
 645                 // TODO Need to do somethiong here
 646                 return -1; //unrecovered error
 647         }
 648
 649         return 0;
 650 }
 651
 652
 653 ///////////////////////// TNODES ///////////////////////
 654
 655 // List of spare tnodes
 656 // The list is hooked together using the first pointer
 657 // in the tnode.
 658
 659 //static yaffs_Tnode *yaffs_freeTnodes = NULL;
 660
 661 // static int yaffs_nFreeTnodes;
 662
 663 //static yaffs_TnodeList *yaffs_allocatedTnodeList = NULL;
 664
 665
 666
 667 // yaffs_CreateTnodes creates a bunch more tnodes and
 668 // adds them to the tnode free list.
 669 // Don't use this function directly
 670
 671 static int yaffs_CreateTnodes(yaffs_Device *dev,int nTnodes)
 672 {
 673     int i;
 674     yaffs_Tnode *newTnodes;
 675     yaffs_TnodeList *tnl;
 676
 677     if(nTnodes < 1) return YAFFS_OK;
 678
 679         // make these things
 680
 681     newTnodes = YMALLOC(nTnodes * sizeof(yaffs_Tnode));
 682
 683     if (!newTnodes)
 684     {
 685                 T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not allocate Tnodes"TENDSTR)));
 686                 return YAFFS_FAIL;
 687     }
 688
 689     // Hook them into the free list
 690     for(i = 0; i < nTnodes - 1; i++)
 691     {
 692         newTnodes[i].internal[0] = &newTnodes[i+1];
 693 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 694         newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = 1;
 695 #endif
 696     }
 697
 698         newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
 699 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 700         newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = 1;
 701 #endif
 702         dev->freeTnodes = newTnodes;
 703         dev->nFreeTnodes+= nTnodes;
 704         dev->nTnodesCreated += nTnodes;
 705
 706         // Now add this bunch of tnodes to a list for freeing up.
 707         // NB If we can't add this to the management list it isn't fatal
 708         // but it just means we can't free this bunch of tnodes later.
 709         tnl = YMALLOC(sizeof(yaffs_TnodeList));
 710         if(!tnl)
 711         {
 712                 T(YAFFS_TRACE_ERROR,(TSTR("yaffs: Could not add tnodes to management list" TENDSTR)));
 713
 714         }
 715         else
 716         {
 717                 tnl->tnodes = newTnodes;
 718                 tnl->next = dev->allocatedTnodeList;
 719                 dev->allocatedTnodeList = tnl;
 720         }
 721
 722
 723         T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Tnodes added" TENDSTR)));
 724
 725
 726         return YAFFS_OK;
 727 }
 728
 729
 730 // GetTnode gets us a clean tnode. Tries to make allocate more if we run out
 731 static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
 732 {
 733         yaffs_Tnode *tn = NULL;
 734
 735         // If there are none left make more
 736         if(!dev->freeTnodes)
 737         {
 738                 yaffs_CreateTnodes(dev,YAFFS_ALLOCATION_NTNODES);
 739         }
 740
 741         if(dev->freeTnodes)
 742         {
 743                 tn = dev->freeTnodes;
 744 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 745         if(tn->internal[YAFFS_NTNODES_INTERNAL] != 1)
 746                 {
 747                         // Hoosterman, this thing looks like it isn't in the list
 748                                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Tnode list bug 1" TENDSTR)));
 749                 }
 750 #endif
 751                 dev->freeTnodes = dev->freeTnodes->internal[0];
 752                 dev->nFreeTnodes--;
 753                 // zero out
 754                 memset(tn,0,sizeof(yaffs_Tnode));
 755         }
 756
 757
 758         return tn;
 759 }
 760
 761
 762 // FreeTnode frees up a tnode and puts it back on the free list
 763 static void yaffs_FreeTnode(yaffs_Device*dev, yaffs_Tnode *tn)
 764 {
 765         if(tn)
 766         {
 767 #ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
 768         if(tn->internal[YAFFS_NTNODES_INTERNAL] != 0)
 769                 {
 770                         // Hoosterman, this thing looks like it is already in the list
 771                                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: Tnode list bug 2" TENDSTR)));
 772                 }
 773                 tn->internal[YAFFS_NTNODES_INTERNAL] = 1;
 774 #endif
 775                 tn->internal[0] = dev->freeTnodes;
 776                 dev->freeTnodes = tn;
 777                 dev->nFreeTnodes++;
 778         }
 779 }
 780
 781
 782 static void yaffs_DeinitialiseTnodes(yaffs_Device*dev)
 783 {
 784         // Free the list of allocated tnodes
 785
 786         while(dev->allocatedTnodeList)
 787         {
 788                 YFREE(dev->allocatedTnodeList->tnodes);
 789                 dev->allocatedTnodeList =  dev->allocatedTnodeList->next;
 790         }
 791
 792         dev->freeTnodes = NULL;
 793         dev->nFreeTnodes = 0;
 794 }
 795
 796 static void yaffs_InitialiseTnodes(yaffs_Device*dev)
 797 {
 798         dev->allocatedTnodeList = NULL;
 799         dev->freeTnodes = NULL;
 800         dev->nFreeTnodes = 0;
 801         dev->nTnodesCreated = 0;
 802
 803 }
 804
 805 #if 0
 806 void yaffs_TnodeTest(yaffs_Device *dev)
 807 {
 808
 809         int i;
 810         int j;
 811         yaffs_Tnode *tn[1000];
 812
 813         YINFO("Testing TNodes");
 814
 815         for(j = 0; j < 50; j++)
 816         {
 817                 for(i = 0; i < 1000; i++)
 818                 {
 819                         tn[i] = yaffs_GetTnode(dev);
 820                         if(!tn[i])
 821                         {
 822                                 YALERT("Getting tnode failed");
 823                         }
 824                 }
 825                 for(i = 0; i < 1000; i+=3)
 826                 {
 827                         yaffs_FreeTnode(dev,tn[i]);
 828                         tn[i] = NULL;
 829                 }
 830
 831         }
 832 }
 833 #endif
 834
 835
 836 ////////////////// END OF TNODE MANIPULATION ///////////////////////////
 837
 838 /////////////// Functions to manipulate the look-up tree (made up of tnodes)
 839 // The look up tree is represented by the top tnode and the number of topLevel
 840 // in the tree. 0 means only the level 0 tnode is in the tree.
 841
 842
 843 // FindLevel0Tnode finds the level 0 tnode, if one exists.
 844 // Used when reading.....
 845 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,yaffs_FileStructure *fStruct, __u32 chunkId)
 846 {
 847
 848         yaffs_Tnode *tn = fStruct->top;
 849         __u32 i;
 850         int requiredTallness;
 851         int level = fStruct->topLevel;
 852
 853         // Check sane level and chunk Id
 854         if(level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
 855         {
 856 //              char str[50];
 857 //              sprintf(str,"Bad level %d",level);
 858 //              YALERT(str);
 859                 return NULL;
 860         }
 861
 862         if(chunkId > YAFFS_MAX_CHUNK_ID)
 863         {
 864 //              char str[50];
 865 //              sprintf(str,"Bad chunkId %d",chunkId);
 866 //              YALERT(str);
 867                 return NULL;
 868         }
 869
 870         // First check we're tall enough (ie enough topLevel)
 871
 872         i = chunkId >> (/*dev->chunkGroupBits  + */YAFFS_TNODES_LEVEL0_BITS);
 873         requiredTallness = 0;
 874         while(i)
 875         {
 876                 i >>= YAFFS_TNODES_INTERNAL_BITS;
 877                 requiredTallness++;
 878         }
 879
 880
 881         if(requiredTallness > fStruct->topLevel)
 882         {
 883                 // Not tall enough, so we can't find it, return NULL.
 884                 return NULL;
 885         }
 886
 887
 888         // Traverse down to level 0
 889         while (level > 0 && tn)
 890         {
 891             tn = tn->internal[(chunkId >>(/* dev->chunkGroupBits + */ YAFFS_TNODES_LEVEL0_BITS + (level-1) * YAFFS_TNODES_INTERNAL_BITS)) &
 892                                YAFFS_TNODES_INTERNAL_MASK];
 893                 level--;
 894
 895         }
 896
 897         return tn;
 898 }
 899
 900 // AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
 901 // This happens in two steps:
 902 //  1. If the tree isn't tall enough, then make it taller.
 903 //  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
 904 //
 905 // Used when modifying the tree.
 906 //
 907 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, yaffs_FileStructure *fStruct, __u32 chunkId)
 908 {
 909
 910         yaffs_Tnode *tn;
 911
 912         int requiredTallness;
 913         int i;
 914         int l;
 915
 916         __u32 x;
 917
 918
 919         //T((TSTR("AddOrFind topLevel=%d, chunk=%d"),fStruct->topLevel,chunkId));
 920
 921         // Check sane level and page Id
 922         if(fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
 923         {
 924 //              char str[50];
 925 //              sprintf(str,"Bad level %d",fStruct->topLevel);
 926 //              YALERT(str);
 927                 return NULL;
 928         }
 929
 930         if(chunkId > YAFFS_MAX_CHUNK_ID)
 931         {
 932 //              char str[50];
 933 //              sprintf(str,"Bad chunkId %d",chunkId);
 934 //              YALERT(str);
 935                 return NULL;
 936         }
 937
 938         // First check we're tall enough (ie enough topLevel)
 939
 940         x = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS);
 941         requiredTallness = 0;
 942         while(x)
 943         {
 944                 x >>= YAFFS_TNODES_INTERNAL_BITS;
 945                 requiredTallness++;
 946         }
 947
 948         //T((TSTR(" required=%d"),requiredTallness));
 949
 950
 951         if(requiredTallness > fStruct->topLevel)
 952         {
 953                 // Not tall enough,gotta make the tree taller
 954                 for(i = fStruct->topLevel; i < requiredTallness; i++)
 955                 {
 956                         //T((TSTR(" add new top")));
 957
 958                         tn = yaffs_GetTnode(dev);
 959
 960                         if(tn)
 961                         {
 962                                 tn->internal[0] = fStruct->top;
 963                                 fStruct->top = tn;
 964                         }
 965                         else
 966                         {
 967                                         T(YAFFS_TRACE_ERROR,(TSTR("yaffs: no more tnodes" TENDSTR)));
 968                         }
 969                 }
 970
 971                 fStruct->topLevel = requiredTallness;
 972         }
 973
 974
 975         // Traverse down to level 0, adding anything we need
 976
 977         l = fStruct->topLevel;
 978         tn = fStruct->top;
 979         while (l > 0 && tn)
 980         {
 981                 x = (chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS + (l-1) * YAFFS_TNODES_INTERNAL_BITS)) &
 982                                YAFFS_TNODES_INTERNAL_MASK;
 983
 984                 //T((TSTR(" [%d:%d]"),l,i));
 985
 986             if(!tn->internal[x])
 987             {
 988                 //T((TSTR(" added")));
 989
 990                 tn->internal[x] = yaffs_GetTnode(dev);
 991             }
 992
 993             tn =        tn->internal[x];
 994                 l--;
 995
 996         }
 997
 998         //TSTR(TENDSTR)));
 999
1000         return tn;
1001 }
1002
1003 // DeleteWorker scans backwards through the tnode tree and deletes all the
1004 // chunks and tnodes in the file
1005 // Returns 1 if the tree was deleted. Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1006
1007 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit)
1008 {
1009         int i;
1010         int chunkInInode;
1011         int theChunk;
1012         yaffs_Tags tags;
1013         int found;
1014         int chunkDeleted;
1015         int allDone = 1;
1016
1017
1018         if(tn)
1019         {
1020                 if(level > 0)
1021                 {
1022
1023                         for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--)
1024                         {
1025                             if(tn->internal[i])
1026                         {
1027                                         if(limit && (*limit) < 0)
1028                                         {
1029                                                 allDone = 0;
1030                                         }
1031                                         else
1032                                         {
1033                                                 allDone = yaffs_DeleteWorker(in,tn->internal[i],level - 1,
1034                                                                                 (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i ,limit);
1035                                         }
1036                                         if(allDone)
1037                                         {
1038                                                 yaffs_FreeTnode(in->myDev,tn->internal[i]);
1039                                         tn->internal[i] = NULL;
1040                                         }
1041                             }
1042
1043                         }
1044                         return (allDone) ? 1 : 0;
1045                 }
1046                 else if(level == 0)
1047                 {
1048                         int hitLimit = 0;
1049
1050                         for(i = YAFFS_NTNODES_LEVEL0 -1; i >= 0 && !hitLimit; i--)
1051                         {
1052                             if(tn->level0[i])
1053                         {
1054                                         int j;
1055
1056                                         chunkInInode = (chunkOffset << YAFFS_TNODES_LEVEL0_BITS ) + i;
1057
1058                                         theChunk =  tn->level0[i] << in->myDev->chunkGroupBits;
1059
1060                                         // Now we need to search for it
1061                                         for(j = 0,found = 0; theChunk && j < in->myDev->chunkGroupSize && !found; j++)
1062                                         {
1063                                                 yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,&tags,&chunkDeleted);
1064                                                 if(yaffs_TagsMatch(&tags,in->objectId,chunkInInode,chunkDeleted))
1065                                                 {
1066                                                         // found it;
1067                                                         found = 1;
1068
1069                                                 }
1070                                                 else
1071                                                 {
1072                                                         theChunk++;
1073                                                 }
1074                                         }
1075
1076                                         if(found)
1077                                         {
1078                                                 yaffs_DeleteChunk(in->myDev,theChunk,1);
1079                                                 in->nDataChunks--;
1080                                                 if(limit)
1081                                                 {
1082                                                         *limit = *limit-1;
1083                                                         if(limit <= 0)
1084                                                         {
1085                                                                 hitLimit = 1;
1086                                                         }
1087                                                 }
1088
1089                                         }
1090
1091                                 tn->level0[i] = 0;
1092                             }
1093
1094                         }
1095                         return (i < 0) ? 1 : 0;
1096
1097
1098                 }
1099
1100         }
1101
1102         return 1;
1103
1104 }
1105
1106 // SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1107 // All soft deleting does is increment the block's softdelete count and pulls the chunk out
1108 // of the tnode.
1109 // THus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1110 //
1111 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset)
1112 {
1113         int i;
1114         int chunkInInode;
1115         int theChunk;
1116         yaffs_BlockInfo *theBlock;
1117         yaffs_Tags tags;
1118         int found;
1119         int chunkDeleted;
1120         int allDone = 1;
1121
1122
1123         if(tn)
1124         {
1125                 if(level > 0)
1126                 {
1127
1128                         for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--)
1129                         {
1130                             if(tn->internal[i])
1131                         {
1132                                                 allDone = yaffs_SoftDeleteWorker(in,tn->internal[i],level - 1,
1133                                                                                 (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i);
1134                                         if(allDone)
1135                                         {
1136                                                 yaffs_FreeTnode(in->myDev,tn->internal[i]);
1137                                         tn->internal[i] = NULL;
1138                                         }
1139                                         else
1140                                         {
1141                                                 //Hoosterman... how could this happen.
1142                                         }
1143                                 }
1144                         }
1145                         return (allDone) ? 1 : 0;
1146                 }
1147                 else if(level == 0)
1148                 {
1149
1150                         for(i = YAFFS_NTNODES_LEVEL0 -1; i >=0; i--)
1151                         {
1152                             if(tn->level0[i])
1153                         {
1154                                         theChunk =  (tn->level0[i] << in->myDev->chunkGroupBits);
1155                                         T(YAFFS_TRACE_SCAN,(TSTR("soft delete tch %d cgb %d chunk %d" TENDSTR),
1156                                                 tn->level0[i],in->myDev->chunkGroupBits,theChunk));
1157
1158                                         theBlock =      yaffs_GetBlockInfo(in->myDev,  theChunk/in->myDev->nChunksPerBlock);
1159                                         if(theBlock)
1160                                         {
1161                                                 theBlock->softDeletions++;
1162                                         }
1163                                 tn->level0[i] = 0;
1164                             }
1165
1166                         }
1167                         return 1;
1168
1169                 }
1170
1171         }
1172
1173         return 1;
1174
1175 }
1176
1177
1178
1179 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1180 {
1181         if(obj->deleted &&
1182            obj->variantType == YAFFS_OBJECT_TYPE_FILE &&
1183            !obj->softDeleted)
1184         {
1185                 if(obj->nDataChunks <= 0)
1186                 {
1187                                 // Empty file, just delete it immediately
1188                                 yaffs_FreeTnode(obj->myDev,obj->variant.fileVariant.top);
1189                                 obj->variant.fileVariant.top = NULL;
1190                                 T(YAFFS_TRACE_TRACING,(TSTR("yaffs: Deleting empty file %d" TENDSTR),obj->objectId));
1191                                 yaffs_DoGenericObjectDeletion(obj);
1192                 }
1193                 else
1194                 {
1195                         yaffs_SoftDeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0);
1196                         obj->softDeleted = 1;
1197                 }
1198         }
1199 }
1200
1201
1202
1203
1204
1205 // Pruning removes any part of the file structure tree that is beyond the
1206 // bounds of the file (ie that does not point to chunks).
1207 //
1208 // A file should only get pruned when its size is reduced.
1209 //
1210 // Before pruning, the chunks must be pulled from the tree and the
1211 // level 0 tnode entries must be zeroed out.
1212 // Could also use this for file deletion, but that's probably better handled
1213 // by a special case.
1214
1215 // yaffs_PruneWorker should only be called by yaffs_PruneFileStructure()
1216
1217 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, __u32 level, int del0)
1218 {
1219         int i;
1220         int hasData;
1221
1222         if(tn)
1223         {
1224                 hasData = 0;
1225
1226                 for(i = 0; i < YAFFS_NTNODES_INTERNAL; i++)
1227                 {
1228                     if(tn->internal[i] && level > 0)
1229                     {
1230                         tn->internal[i] = yaffs_PruneWorker(dev,tn->internal[i],level - 1, ( i == 0) ? del0 : 1);
1231                     }
1232
1233                     if(tn->internal[i])
1234                     {
1235                         hasData++;
1236                         }
1237                 }
1238
1239                 if(hasData == 0 && del0)
1240                 {
1241                         // Free and return NULL
1242
1243                         yaffs_FreeTnode(dev,tn);
1244                         tn = NULL;
1245                 }
1246
1247         }
1248
1249         return tn;
1250
1251 }
1252
1253 static int yaffs_PruneFileStructure(yaffs_Device *dev, yaffs_FileStructure *fStruct)
1254 {
1255         int i;
1256         int hasData;
1257         int done = 0;
1258         yaffs_Tnode *tn;
1259
1260         if(fStruct->topLevel > 0)
1261         {
1262                 fStruct->top = yaffs_PruneWorker(dev,fStruct->top, fStruct->topLevel,0);
1263
1264                 // Now we have a tree with all the non-zero branches NULL but the height
1265                 // is the same as it was.
1266                 // Let's see if we can trim internal tnodes to shorten the tree.
1267                 // We can do this if only the 0th element in the tnode is in use
1268                 // (ie all the non-zero are NULL)
1269
1270                 while(fStruct->topLevel && !done)
1271                 {
1272                         tn = fStruct->top;
1273
1274                         hasData = 0;
1275                         for(i = 1; i <YAFFS_NTNODES_INTERNAL; i++)
1276                         {
1277                                 if(tn->internal[i])
1278                         {
1279                                 hasData++;
1280                                 }
1281                         }
1282
1283                         if(!hasData)
1284                         {
1285                                 fStruct->top = tn->internal[0];
1286                                 fStruct->topLevel--;
1287                                 yaffs_FreeTnode(dev,tn);
1288                         }
1289                         else
1290                         {
1291                                 done = 1;
1292                         }
1293                 }
1294         }
1295
1296         return YAFFS_OK;
1297 }
1298
1299
1300
1301
1302
1303 /////////////////////// End of File Structure functions. /////////////////
1304
1305 // yaffs_CreateFreeObjects creates a bunch more objects and
1306 // adds them to the object free list.
1307 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
1308 {
1309     int i;
1310     yaffs_Object *newObjects;
1311     yaffs_ObjectList *list;
1312
1313     if(nObjects < 1) return YAFFS_OK;
1314
1315         // make these things
1316
1317     newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1318
1319     if (!newObjects)
1320     {
1321                 T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1322                 return YAFFS_FAIL;
1323     }
1324
1325     // Hook them into the free list
1326     for(i = 0; i < nObjects - 1; i++)
1327     {
1328         newObjects[i].siblings.next = (struct list_head *)(&newObjects[i+1]);
1329     }
1330
1331         newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1332         dev->freeObjects = newObjects;
1333         dev->nFreeObjects+= nObjects;
1334         dev->nObjectsCreated+= nObjects;
1335
1336         // Now add this bunch of Objects to a list for freeing up.
1337
1338         list = YMALLOC(sizeof(yaffs_ObjectList));
1339         if(!list)
1340         {
1341                 T(YAFFS_TRACE_ALLOCATE,(TSTR("Could not add objects to management list" TENDSTR)));
1342         }
1343         else
1344         {
1345                 list->objects = newObjects;
1346                 list->next = dev->allocatedObjectList;
1347                 dev->allocatedObjectList = list;
1348         }
1349
1350
1351
1352         return YAFFS_OK;
1353 }
1354
1355
1356 // AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out
1357 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
1358 {
1359         yaffs_Object *tn = NULL;
1360
1361         // If there are none left make more
1362         if(!dev->freeObjects)
1363         {
1364                 yaffs_CreateFreeObjects(dev,YAFFS_ALLOCATION_NOBJECTS);
1365         }
1366
1367         if(dev->freeObjects)
1368         {
1369                 tn = dev->freeObjects;
1370                 dev->freeObjects = (yaffs_Object *)(dev->freeObjects->siblings.next);
1371                 dev->nFreeObjects--;
1372
1373                 // Now sweeten it up...
1374
1375                 memset(tn,0,sizeof(yaffs_Object));
1376                 tn->myDev = dev;
1377                 tn->chunkId = -1;
1378                 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1379                 INIT_LIST_HEAD(&(tn->hardLinks));
1380                 INIT_LIST_HEAD(&(tn->hashLink));
1381                 INIT_LIST_HEAD(&tn->siblings);
1382
1383                 // Add it to the lost and found directory.
1384                 // NB Can't put root or lostNFound in lostNFound so
1385                 // check if lostNFound exists first
1386                 if(dev->lostNFoundDir)
1387                 {
1388                         yaffs_AddObjectToDirectory(dev->lostNFoundDir,tn);
1389                 }
1390         }
1391
1392
1393         return tn;
1394 }
1395
1396 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev,int number,__u32 mode)
1397 {
1398
1399         yaffs_Object *obj = yaffs_CreateNewObject(dev,number,YAFFS_OBJECT_TYPE_DIRECTORY);
1400         if(obj)
1401         {
1402                 obj->fake = 1;                  // it is fake so it has no NAND presence...
1403                 obj->renameAllowed= 0;  // ... and we're not allowed to rename it...
1404                 obj->unlinkAllowed= 0;  // ... or unlink it
1405                 obj->deleted = 0;
1406                 obj->unlinked = 0;
1407                 obj->st_mode = mode;
1408                 obj->myDev = dev;
1409                 obj->chunkId = 0; // Not a valid chunk.
1410         }
1411
1412         return obj;
1413
1414 }
1415
1416
1417 static void yaffs_UnhashObject(yaffs_Object *tn)
1418 {
1419         int bucket;
1420         yaffs_Device *dev = tn->myDev;
1421
1422
1423         // If it is still linked into the bucket list, free from the list
1424         if(!list_empty(&tn->hashLink))
1425         {
1426                 list_del_init(&tn->hashLink);
1427                 bucket =  yaffs_HashFunction(tn->objectId);
1428                 dev->objectBucket[bucket].count--;
1429         }
1430
1431 }
1432
1433
1434 // FreeObject frees up a Object and puts it back on the free list
1435 static void yaffs_FreeObject(yaffs_Object *tn)
1436 {
1437
1438         yaffs_Device *dev = tn->myDev;
1439
1440         yaffs_UnhashObject(tn);
1441
1442         // Link into the free list.
1443         tn->siblings.next = (struct list_head *)(dev->freeObjects);
1444         dev->freeObjects = tn;
1445         dev->nFreeObjects++;
1446 }
1447
1448
1449
1450
1451 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
1452 {
1453         // Free the list of allocated Objects
1454
1455         while( dev->allocatedObjectList)
1456         {
1457                 YFREE(dev->allocatedObjectList->objects);
1458                 dev->allocatedObjectList =  dev->allocatedObjectList->next;
1459         }
1460
1461         dev->freeObjects = NULL;
1462         dev->nFreeObjects = 0;
1463 }
1464
1465 static void yaffs_InitialiseObjects(yaffs_Device *dev)
1466 {
1467         int i;
1468
1469         dev->allocatedObjectList = NULL;
1470         dev->freeObjects = NULL;
1471         dev->nFreeObjects = 0;
1472
1473         for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++)
1474         {
1475                 INIT_LIST_HEAD(&dev->objectBucket[i].list);
1476                 dev->objectBucket[i].count = 0;
1477         }
1478
1479 }
1480
1481
1482
1483
1484
1485
1486 int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
1487 {
1488         static int x = 0;
1489         int i;
1490         int l = 999;
1491         int lowest = 999999;
1492
1493
1494         // First let's see if we can find one that's empty.
1495
1496         for(i = 0; i < 10 && lowest > 0; i++)
1497          {
1498                 x++;
1499                 x %=  YAFFS_NOBJECT_BUCKETS;
1500                 if(dev->objectBucket[x].count < lowest)
1501                 {
1502                         lowest = dev->objectBucket[x].count;
1503                         l = x;
1504                 }
1505
1506         }
1507
1508         // If we didn't find an empty list, then try
1509         // looking a bit further for a short one
1510
1511         for(i = 0; i < 10 && lowest > 3; i++)
1512          {
1513                 x++;
1514                 x %=  YAFFS_NOBJECT_BUCKETS;
1515                 if(dev->objectBucket[x].count < lowest)
1516                 {
1517                         lowest = dev->objectBucket[x].count;
1518                         l = x;
1519                 }
1520
1521         }
1522
1523         return l;
1524 }
1525
1526 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
1527 {
1528         int bucket = yaffs_FindNiceObjectBucket(dev);
1529
1530         // Now find an object value that has not already been taken
1531         // by scanning the list.
1532
1533         int found = 0;
1534         struct list_head *i;
1535
1536         __u32 n = (__u32)bucket;
1537
1538         //yaffs_CheckObjectHashSanity();
1539
1540         while(!found)
1541         {
1542                 found = 1;
1543                 n +=  YAFFS_NOBJECT_BUCKETS;
1544                 if(1 ||dev->objectBucket[bucket].count > 0)
1545                 {
1546                         list_for_each(i,&dev->objectBucket[bucket].list)
1547                         {
1548                                 // If there is already one in the list
1549                                 if(i && list_entry(i, yaffs_Object,hashLink)->objectId == n)
1550                                 {
1551                                         found = 0;
1552                                 }
1553                         }
1554                 }
1555         }
1556
1557         //T(("bucket %d count %d inode %d\n",bucket,yaffs_objectBucket[bucket].count,n);
1558
1559         return n;
1560 }
1561
1562 void yaffs_HashObject(yaffs_Object *in)
1563 {
1564         int bucket = yaffs_HashFunction(in->objectId);
1565         yaffs_Device *dev = in->myDev;
1566
1567         if(!list_empty(&in->hashLink))
1568         {
1569                 //YINFO("!!!");
1570         }
1571
1572
1573         list_add(&in->hashLink,&dev->objectBucket[bucket].list);
1574         dev->objectBucket[bucket].count++;
1575
1576 }
1577
1578 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number)
1579 {
1580         int bucket = yaffs_HashFunction(number);
1581         struct list_head *i;
1582         yaffs_Object *in;
1583
1584         list_for_each(i,&dev->objectBucket[bucket].list)
1585         {
1586                 // Look if it is in the list
1587                 if(i)
1588                 {
1589                         in = list_entry(i, yaffs_Object,hashLink);
1590                         if(in->objectId == number)
1591                         {
1592                                 return in;
1593                         }
1594                 }
1595         }
1596
1597         return NULL;
1598 }
1599
1600
1601
1602 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type)
1603 {
1604
1605         yaffs_Object *theObject;
1606
1607         if(number < 0)
1608         {
1609                 number = yaffs_CreateNewObjectNumber(dev);
1610         }
1611
1612         theObject = yaffs_AllocateEmptyObject(dev);
1613
1614         if(theObject)
1615         {
1616                 theObject->fake = 0;
1617                 theObject->renameAllowed = 1;
1618                 theObject->unlinkAllowed = 1;
1619                 theObject->objectId = number;
1620                 yaffs_HashObject(theObject);
1621                 theObject->variantType = type;
1622 #ifdef CONFIG_YAFFS_WINCE
1623                 yfsd_WinFileTimeNow(theObject->win_atime);
1624                 theObject->win_ctime[0] = theObject->win_mtime[0] = theObject->win_atime[0];
1625                 theObject->win_ctime[1] = theObject->win_mtime[1] = theObject->win_atime[1];
1626
1627 #else
1628                 theObject->st_atime = theObject->st_mtime =     theObject->st_ctime = CURRENT_TIME;
1629 #endif
1630                 switch(type)
1631                 {
1632                         case YAFFS_OBJECT_TYPE_FILE:
1633                                 theObject->variant.fileVariant.fileSize = 0;
1634                                 theObject->variant.fileVariant.scannedFileSize = 0;
1635                                 theObject->variant.fileVariant.topLevel = 0;
1636                                 theObject->variant.fileVariant.top  = yaffs_GetTnode(dev);
1637                                 break;
1638                         case YAFFS_OBJECT_TYPE_DIRECTORY:
1639                                 INIT_LIST_HEAD(&theObject->variant.directoryVariant.children);
1640                                 break;
1641                         case YAFFS_OBJECT_TYPE_SYMLINK:
1642                                 // No action required
1643                                 break;
1644                         case YAFFS_OBJECT_TYPE_HARDLINK:
1645                                 // No action required
1646                                 break;
1647                         case YAFFS_OBJECT_TYPE_SPECIAL:
1648                                 // No action required
1649                                 break;
1650                         case YAFFS_OBJECT_TYPE_UNKNOWN:
1651                                 // todo this should not happen
1652                                 break;
1653                 }
1654         }
1655
1656         return theObject;
1657 }
1658
1659 yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev, int number,yaffs_ObjectType type)
1660 {
1661         yaffs_Object *theObject = NULL;
1662
1663         if(number > 0)
1664         {
1665                 theObject = yaffs_FindObjectByNumber(dev,number);
1666         }
1667
1668         if(!theObject)
1669         {
1670                 theObject = yaffs_CreateNewObject(dev,number,type);
1671         }
1672
1673         return theObject;
1674
1675 }
1676
1677 char *yaffs_CloneString(const char *str)
1678 {
1679         char *newStr = NULL;
1680
1681         if(str && *str)
1682         {
1683                 newStr = YMALLOC(strlen(str) + 1);
1684                 strcpy(newStr,str);
1685         }
1686
1687         return newStr;
1688
1689 }
1690
1691 //
1692 // Mknod (create) a new object.
1693 // equivalentObject only has meaning for a hard link;
1694 // aliasString only has meaning for a sumlink.
1695 // rdev only has meaning for devices (a subset of special objects)
1696 yaffs_Object *yaffs_MknodObject( yaffs_ObjectType type,
1697                                                                  yaffs_Object *parent,
1698                                                                  const char *name,
1699                                                                  __u32 mode,
1700                                                                  __u32 uid,
1701                                                                  __u32 gid,
1702                                                                  yaffs_Object *equivalentObject,
1703                                                                  const char *aliasString,
1704                                                                  __u32 rdev)
1705 {
1706         yaffs_Object *in;
1707
1708         yaffs_Device *dev = parent->myDev;
1709
1710         // Check if the entry exists. If it does then fail the call since we don't want a dup.
1711         if(yaffs_FindObjectByName(parent,name))
1712         {
1713                 return NULL;
1714         }
1715
1716         in = yaffs_CreateNewObject(dev,-1,type);
1717
1718         if(in)
1719         {
1720                 in->chunkId = -1;
1721                 in->valid = 1;
1722                 in->variantType = type;
1723
1724                 in->st_mode  = mode;
1725
1726 #ifdef CONFIG_YAFFS_WINCE
1727                 yfsd_WinFileTimeNow(in->win_atime);
1728                 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
1729                 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[0];
1730
1731 #else
1732                 in->st_atime = in->st_mtime = in->st_ctime = CURRENT_TIME;
1733                 in->st_rdev  = rdev;
1734                 in->st_uid   = uid;
1735                 in->st_gid   = gid;
1736 #endif
1737                 in->nDataChunks = 0;
1738
1739                 yaffs_SetObjectName(in,name);
1740                 in->dirty = 1;
1741
1742                 yaffs_AddObjectToDirectory(parent,in);
1743
1744                 in->myDev = parent->myDev;
1745
1746
1747                 switch(type)
1748                 {
1749                         case YAFFS_OBJECT_TYPE_SYMLINK:
1750                                 in->variant.symLinkVariant.alias = yaffs_CloneString(aliasString);
1751                                 break;
1752                         case YAFFS_OBJECT_TYPE_HARDLINK:
1753                                 in->variant.hardLinkVariant.equivalentObject = equivalentObject;
1754                                 in->variant.hardLinkVariant.equivalentObjectId = equivalentObject->objectId;
1755                                 list_add(&in->hardLinks,&equivalentObject->hardLinks);
1756                                 break;
1757                         case YAFFS_OBJECT_TYPE_FILE: // do nothing
1758                         case YAFFS_OBJECT_TYPE_DIRECTORY: // do nothing
1759                         case YAFFS_OBJECT_TYPE_SPECIAL: // do nothing
1760                         case YAFFS_OBJECT_TYPE_UNKNOWN:
1761                                 break;
1762                 }
1763
1764                 if(/*yaffs_GetNumberOfFreeChunks(dev) <= 0 || */
1765                    yaffs_UpdateObjectHeader(in,name,0) < 0)
1766                 {
1767                         // Could not create the object header, fail the creation
1768                         yaffs_AbortHalfCreatedObject(in);
1769                         in = NULL;
1770                 }
1771
1772         }
1773
1774         return in;
1775 }
1776
1777 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid)
1778 {
1779         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE,parent,name,mode,uid,gid,NULL,NULL,0);
1780 }
1781
1782 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid)
1783 {
1784         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,0);
1785 }
1786
1787 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
1788 {
1789         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,rdev);
1790 }
1791
1792 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid,const char *alias)
1793 {
1794         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK,parent,name,mode,uid,gid,NULL,alias,0);
1795 }
1796
1797 // NB yaffs_Link returns the object id of the equivalent object.
1798 yaffs_Object *yaffs_Link(yaffs_Object *parent, const char *name, yaffs_Object *equivalentObject)
1799 {
1800         // Get the real object in case we were fed a hard link as an equivalent object
1801         equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
1802
1803         if(yaffs_MknodObject(YAFFS_OBJECT_TYPE_HARDLINK,parent,name,0,0,0,equivalentObject,NULL,0))
1804         {
1805                 return equivalentObject;
1806         }
1807         else
1808         {
1809                 return NULL;
1810         }
1811
1812 }
1813
1814
1815 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir, const char *newName,int force)
1816 {
1817         int unlinkOp;
1818
1819         if(newDir == NULL)
1820         {
1821                 newDir = obj->parent; // use the old directory
1822         }
1823
1824         unlinkOp = (newDir == obj->myDev->unlinkedDir && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
1825
1826         // If the object is a file going into the unlinked directory, then it is OK to just stuff it in since
1827         // duplicate names are allowed.
1828         // Otherwise only proceed if the new name does not exist and if we're putting it into a directory.
1829         if( (unlinkOp||
1830                  force ||
1831                  !yaffs_FindObjectByName(newDir,newName))  &&
1832              newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1833         {
1834                 yaffs_SetObjectName(obj,newName);
1835                 obj->dirty = 1;
1836
1837                 yaffs_AddObjectToDirectory(newDir,obj);
1838
1839                 if(unlinkOp) obj->unlinked = 1;
1840
1841
1842                 if(yaffs_UpdateObjectHeader(obj,newName,0) >= 0)
1843                 {
1844                         return YAFFS_OK;
1845                 }
1846         }
1847
1848         return YAFFS_FAIL;
1849 }
1850
1851
1852
1853 int yaffs_RenameObject(yaffs_Object *oldDir, const char *oldName, yaffs_Object *newDir, const char *newName)
1854 {
1855         yaffs_Object *obj;
1856         int force = 0;
1857
1858 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1859         // Special case for WinCE.
1860         // While look-up is case insensitive, the name isn't.
1861         // THerefore we might want to change x.txt to X.txt
1862         if(oldDir == newDir && _stricmp(oldName,newName) == 0)
1863         {
1864                 force = 1;
1865         }
1866 #endif
1867
1868         obj = yaffs_FindObjectByName(oldDir,oldName);
1869         if(obj && obj->renameAllowed)
1870         {
1871                 return yaffs_ChangeObjectName(obj,newDir,newName,force);
1872         }
1873         return YAFFS_FAIL;
1874 }
1875
1876
1877
1878 static int yaffs_CheckObjectHashSanity(yaffs_Device *dev)
1879 {
1880         // Scan the buckets and check that the lists
1881         // have as many members as the count says there are
1882         int bucket;
1883         int countEm;
1884         struct list_head *j;
1885         int ok = YAFFS_OK;
1886
1887         for(bucket = 0; bucket < YAFFS_NOBJECT_BUCKETS; bucket++)
1888         {
1889                 countEm = 0;
1890
1891                 list_for_each(j,&dev->objectBucket[bucket].list)
1892                 {
1893                         countEm++;
1894                 }
1895
1896                 if(countEm != dev->objectBucket[bucket].count)
1897                 {
1898                         T(YAFFS_TRACE_ERROR,(TSTR("Inode hash inconsistency" TENDSTR)));
1899                         ok = YAFFS_FAIL;
1900                 }
1901         }
1902
1903         return ok;
1904 }
1905
1906 #if 0
1907 void yaffs_ObjectTest(yaffs_Device *dev)
1908 {
1909         yaffs_Object *in[1000];
1910         int inNo[1000];
1911         yaffs_Object *inold[1000];
1912         int i;
1913         int j;
1914
1915         memset(in,0,1000*sizeof(yaffs_Object *));
1916         memset(inold,0,1000*sizeof(yaffs_Object *));
1917
1918         yaffs_CheckObjectHashSanity(dev);
1919
1920         for(j = 0; j < 10; j++)
1921         {
1922                 //T(("%d\n",j));
1923
1924                 for(i = 0; i < 1000; i++)
1925                 {
1926                         in[i] = yaffs_CreateNewObject(dev,-1,YAFFS_OBJECT_TYPE_FILE);
1927                         if(!in[i])
1928                         {
1929                                 YINFO("No more inodes");
1930                         }
1931                         else
1932                         {
1933                                 inNo[i] = in[i]->objectId;
1934                         }
1935                 }
1936
1937                 for(i = 0; i < 1000; i++)
1938                 {
1939                         if(yaffs_FindObjectByNumber(dev,inNo[i]) != in[i])
1940                         {
1941                                 //T(("Differnce in look up test\n"));
1942                         }
1943                         else
1944                         {
1945                                 // T(("Look up ok\n"));
1946                         }
1947                 }
1948
1949                 yaffs_CheckObjectHashSanity(dev);
1950
1951                 for(i = 0; i < 1000; i+=3)
1952                 {
1953                         yaffs_FreeObject(in[i]);
1954                         in[i] = NULL;
1955                 }
1956
1957
1958                 yaffs_CheckObjectHashSanity(dev);
1959         }
1960
1961 }
1962
1963 #endif
1964
1965 /////////////////////////// Block Management and Page Allocation ///////////////////
1966
1967
1968 static int yaffs_InitialiseBlocks(yaffs_Device *dev,int nBlocks)
1969 {
1970         dev->allocationBlock = -1; // force it to get a new one
1971         //Todo we're assuming the malloc will pass.
1972         dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
1973         // Set up dynamic blockinfo stuff.
1974         dev->chunkBitmapStride = (dev->nChunksPerBlock+7)/8;
1975         dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
1976         if(dev->blockInfo && dev->chunkBits)
1977         {
1978                 memset(dev->blockInfo,0,nBlocks * sizeof(yaffs_BlockInfo));
1979                 memset(dev->chunkBits,0,dev->chunkBitmapStride * nBlocks);
1980                 return YAFFS_OK;
1981         }
1982
1983         return YAFFS_FAIL;
1984
1985 }
1986
1987 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
1988 {
1989         YFREE(dev->blockInfo);
1990         dev->blockInfo = NULL;
1991         YFREE(dev->chunkBits);
1992         dev->chunkBits = NULL;
1993 }
1994
1995 // FindDiretiestBlock is used to select the dirtiest block (or close enough)
1996 // for garbage collection.
1997
1998 static int yaffs_FindDirtiestBlock(yaffs_Device *dev,int aggressive)
1999 {
2000
2001         int b = dev->currentDirtyChecker;
2002
2003         int i;
2004         int iterations;
2005         int dirtiest = -1;
2006         int pagesInUse;
2007         yaffs_BlockInfo *bi;
2008
2009         // If we're doing aggressive GC then we are happy to take a less-dirty block, and
2010         // search further.
2011
2012         pagesInUse = (aggressive)? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2013         if(aggressive)
2014         {
2015                 iterations = dev->endBlock - dev->startBlock + 1;
2016         }
2017         else
2018         {
2019                 iterations = dev->endBlock - dev->startBlock + 1;
2020                 iterations = iterations / 16;
2021                 if(iterations > 200)
2022                 {
2023                         iterations = 200;
2024                 }
2025         }
2026
2027         for(i = 0; i <= iterations && pagesInUse > 0 ; i++)
2028         {
2029                 b++;
2030                 if ( b < dev->startBlock || b > dev->endBlock)
2031                 {
2032                         b =  dev->startBlock;
2033                 }
2034
2035                 if(b < dev->startBlock || b > dev->endBlock)
2036                 {
2037                         T(YAFFS_TRACE_ERROR,(TSTR("**>> Block %d is not valid" TENDSTR),b));
2038                         YBUG();
2039                 }
2040
2041                 bi = yaffs_GetBlockInfo(dev,b);
2042
2043                 if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2044                    (bi->pagesInUse - bi->softDeletions )< pagesInUse)
2045                 {
2046                         dirtiest = b;
2047                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2048                 }
2049         }
2050
2051         dev->currentDirtyChecker = b;
2052
2053         return dirtiest;
2054 }
2055
2056
2057 static void yaffs_BlockBecameDirty(yaffs_Device *dev,int blockNo)
2058 {
2059         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,blockNo);
2060
2061         int erasedOk = 0;
2062
2063         // If the block is still healthy erase it and mark as clean.
2064         // If the block has had a data failure, then retire it.
2065         bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2066
2067         if(!bi->needsRetiring)
2068         {
2069                 erasedOk = yaffs_EraseBlockInNAND(dev,blockNo);
2070                 if(!erasedOk)
2071                 {
2072                         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Erasure failed %d" TENDSTR),blockNo));
2073                 }
2074         }
2075
2076         if( erasedOk )
2077         {
2078                 // Clean it up...
2079                 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2080                 dev->nErasedBlocks++;
2081                 bi->pagesInUse = 0;
2082                 bi->softDeletions = 0;
2083                 yaffs_ClearChunkBits(dev,blockNo);
2084
2085                 T(YAFFS_TRACE_ERASE,(TSTR("Erased block %d" TENDSTR),blockNo));
2086         }
2087         else
2088         {
2089                 yaffs_RetireBlock(dev,blockNo);
2090                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Block %d retired" TENDSTR),blockNo));
2091         }
2092 }
2093
2094
2095 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2096 {
2097         int i;
2098
2099         yaffs_BlockInfo *bi;
2100
2101         if(dev->nErasedBlocks < 1)
2102         {
2103                 // Hoosterman we've got a problem.
2104                 // Can't get space to gc
2105                 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no space during gc" TENDSTR)));
2106
2107                 return -1;
2108         }
2109
2110         // Find an empty block.
2111
2112         for(i = dev->startBlock; i <= dev->endBlock; i++)
2113         {
2114                 dev->allocationBlockFinder++;
2115                 if(dev->allocationBlockFinder <dev->startBlock || dev->allocationBlockFinder> dev->endBlock)
2116                 {
2117                         dev->allocationBlockFinder = dev->startBlock;
2118                 }
2119
2120                 bi = yaffs_GetBlockInfo(dev,dev->allocationBlockFinder);
2121
2122                 if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
2123                 {
2124                         bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2125                         dev->nErasedBlocks--;
2126                         return dev->allocationBlockFinder;
2127                 }
2128         }
2129
2130         return -1;
2131 }
2132
2133
2134
2135 static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve)
2136 {
2137         int retVal;
2138         yaffs_BlockInfo *bi;
2139
2140         if(dev->allocationBlock < 0)
2141         {
2142                 // Get next block to allocate off
2143                 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2144                 dev->allocationPage = 0;
2145         }
2146
2147         if(!useReserve &&  dev->nErasedBlocks <= dev->nReservedBlocks)
2148         {
2149                 // Not enough space to allocate unless we're allowed to use the reserve.
2150                 return -1;
2151         }
2152
2153         // Next page please....
2154         if(dev->allocationBlock >= 0)
2155         {
2156                 bi = yaffs_GetBlockInfo(dev,dev->allocationBlock);
2157
2158                 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2159                                   dev->allocationPage;
2160                 bi->pagesInUse++;
2161                 yaffs_SetChunkBit(dev,dev->allocationBlock,dev->allocationPage);
2162
2163                 dev->allocationPage++;
2164
2165                 dev->nFreeChunks--;
2166
2167                 // If the block is full set the state to full
2168                 if(dev->allocationPage >= dev->nChunksPerBlock)
2169                 {
2170                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
2171                         dev->allocationBlock = -1;
2172                 }
2173
2174
2175                 return retVal;
2176
2177         }
2178         T(YAFFS_TRACE_ERROR,(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2179
2180         return -1;
2181 }
2182
2183 // To determine if we have enough space we just look at the
2184 // number of erased blocks.
2185 // The cache is allowed to use reserved blocks.
2186
2187 static int yaffs_CheckSpaceForChunkCache(yaffs_Device *dev)
2188 {
2189         return (dev->nErasedBlocks >= dev->nReservedBlocks);
2190 }
2191
2192
2193 static int  yaffs_GarbageCollectBlock(yaffs_Device *dev,int block)
2194 {
2195         int oldChunk;
2196         int newChunk;
2197         int chunkInBlock;
2198         int markNAND;
2199
2200
2201         yaffs_Spare spare;
2202         yaffs_Tags  tags;
2203         __u8  buffer[YAFFS_BYTES_PER_CHUNK];
2204
2205 //      yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,block);
2206
2207         yaffs_Object *object;
2208
2209         //T(("Collecting block %d n %d bits %x\n",block, bi->pagesInUse, bi->pageBits));
2210
2211         for(chunkInBlock = 0,oldChunk = block * dev->nChunksPerBlock;
2212             chunkInBlock < dev->nChunksPerBlock && yaffs_StillSomeChunkBits(dev,block);
2213             chunkInBlock++, oldChunk++ )
2214         {
2215                 if(yaffs_CheckChunkBit(dev,block,chunkInBlock))
2216                 {
2217
2218                         // This page is in use and might need to be copied off
2219
2220                         markNAND = 1;
2221
2222                         //T(("copying page %x from %d to %d\n",mask,oldChunk,newChunk));
2223
2224                         yaffs_ReadChunkFromNAND(dev,oldChunk,buffer, &spare,1);
2225
2226                         yaffs_GetTagsFromSpare(dev,&spare,&tags);
2227
2228                         object = yaffs_FindObjectByNumber(dev,tags.objectId);
2229
2230                         if(object && object->deleted && tags.chunkId != 0)
2231                         {
2232                                 // Data chunk in a deleted file, throw it away
2233                                 // It's a deleted data chunk,
2234                                 // No need to copy this, just forget about it and fix up the
2235                                 // object.
2236
2237                                 //yaffs_PutChunkIntoFile(object, tags.chunkId, 0,0);
2238                                 object->nDataChunks--;
2239
2240                                 if(object->nDataChunks <= 0)
2241                                 {
2242                                         // Time to delete the file too
2243                                         yaffs_FreeTnode(object->myDev,object->variant.fileVariant.top);
2244                                         object->variant.fileVariant.top = NULL;
2245                                         T(YAFFS_TRACE_TRACING,(TSTR("yaffs: About to finally delete object %d" TENDSTR),object->objectId));
2246                                         yaffs_DoGenericObjectDeletion(object);
2247                                 }
2248                                 markNAND = 0;
2249                         }
2250                         else if( 0 /* Todo object && object->deleted && object->nDataChunks == 0 */)
2251                         {
2252                                 // Deleted object header with no data chunks.
2253                                 // Can be discarded and the file deleted.
2254                                 object->chunkId = 0;
2255                                 yaffs_FreeTnode(object->myDev,object->variant.fileVariant.top);
2256                                 object->variant.fileVariant.top = NULL;
2257                                 yaffs_DoGenericObjectDeletion(object);
2258
2259                         }
2260                         else if(object)
2261                         {
2262                                 // It's either a data chunk in a live file or
2263                                 // an ObjectHeader, so we're interested in it.
2264                                 // NB Need to keep the ObjectHeaders of deleted files
2265                                 // until the whole file has been deleted off
2266                                 tags.serialNumber++;
2267                                 yaffs_LoadTagsIntoSpare(&spare,&tags);
2268
2269                                 dev->nGCCopies++;
2270
2271                                 newChunk = yaffs_WriteNewChunkToNAND(dev, buffer, &spare,1);
2272
2273                                 if(newChunk < 0)
2274                                 {
2275                                         return YAFFS_FAIL;
2276                                 }
2277
2278                                 // Ok, now fix up the Tnodes etc.
2279
2280                                 if(tags.chunkId == 0)
2281                                 {
2282                                         // It's a header
2283                                         object->chunkId = newChunk;
2284                                 }
2285                                 else
2286                                 {
2287                                         // It's a data chunk
2288                                         yaffs_PutChunkIntoFile(object, tags.chunkId, newChunk,0);
2289                                 }
2290                         }
2291
2292                         yaffs_DeleteChunk(dev,oldChunk,markNAND);
2293
2294                 }
2295         }
2296
2297         return YAFFS_OK;
2298 }
2299
2300
2301 static yaffs_Object *yaffs_FindDeletedUnlinkedFile(yaffs_Device *dev)
2302 {
2303         // find a file to delete
2304         struct list_head *i;
2305         yaffs_Object *l;
2306
2307
2308         //Scan the unlinked files looking for one to delete
2309         list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
2310         {
2311                 if(i)
2312                 {
2313                         l = list_entry(i, yaffs_Object,siblings);
2314                         if(l->deleted)
2315                         {
2316                                 return l;
2317                         }
2318                 }
2319         }
2320         return NULL;
2321 }
2322
2323
2324 static void yaffs_DoUnlinkedFileDeletion(yaffs_Device *dev)
2325 {
2326         // This does background deletion on unlinked files.. only deleted ones.
2327         // If we don't have a file we're working on then find one
2328         if(!dev->unlinkedDeletion && dev->nDeletedFiles > 0)
2329         {
2330                 dev->unlinkedDeletion = yaffs_FindDeletedUnlinkedFile(dev);
2331         }
2332
2333         // OK, we're working on a file...
2334         if(dev->unlinkedDeletion)
2335         {
2336                 yaffs_Object *obj = dev->unlinkedDeletion;
2337                 int delresult;
2338                 int limit; // Number of chunks to delete in a file.
2339                                    // NB this can be exceeded, but not by much.
2340
2341                 limit = -1;
2342
2343                 delresult = yaffs_DeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0,&limit);
2344
2345                 if(obj->nDataChunks == 0)
2346                 {
2347                         // Done all the deleting of data chunks.
2348                         // Now dump the header and clean up
2349                         yaffs_FreeTnode(dev,obj->variant.fileVariant.top);
2350                         obj->variant.fileVariant.top = NULL;
2351                         yaffs_DoGenericObjectDeletion(obj);
2352                         dev->nDeletedFiles--;
2353                         dev->nUnlinkedFiles--;
2354                         dev->nBackgroundDeletions++;
2355                         dev->unlinkedDeletion = NULL;
2356                 }
2357         }
2358 }
2359
2360
2361 #if 0
2362 #define YAFFS_GARBAGE_COLLECT_LOW_WATER 2
2363 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
2364 {
2365         int block;
2366         int aggressive=0;
2367
2368         //yaffs_DoUnlinkedFileDeletion(dev);
2369
2370         if(dev->nErasedBlocks <= (dev->nReservedBlocks + YAFFS_GARBAGE_COLLECT_LOW_WATER))
2371         {
2372                 aggressive = 1;
2373         }
2374
2375         if(aggressive)
2376         {
2377                 block = yaffs_FindDirtiestBlock(dev,aggressive);
2378
2379                 if(block >= 0)
2380                 {
2381                         dev->garbageCollections++;
2382                         return yaffs_GarbageCollectBlock(dev,block);
2383                 }
2384                 else
2385                 {
2386                         return YAFFS_FAIL;
2387                 }
2388         }
2389
2390         return YAFFS_OK;
2391 }
2392 #endif
2393
2394 // New garbage collector
2395 // If we're very low on erased blocks then we do aggressive garbage collection
2396 // otherwise we do "passive" garbage collection.
2397 // Aggressive gc looks further (whole array) and will accept dirtier blocks.
2398 // Passive gc only inspects smaller areas and will only accept cleaner blocks.
2399 //
2400 // The idea is to help clear out space in a more spread-out manner.
2401 // Dunno if it really does anything useful.
2402 //
2403 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
2404 {
2405         int block;
2406         int aggressive=0;
2407
2408         //yaffs_DoUnlinkedFileDeletion(dev);
2409
2410         if(dev->nErasedBlocks <= (dev->nReservedBlocks + 1))
2411         {
2412                 aggressive = 1;
2413         }
2414
2415         block = yaffs_FindDirtiestBlock(dev,aggressive);
2416
2417         if(block >= 0)
2418         {
2419                 dev->garbageCollections++;
2420                 if(!aggressive)
2421                 {
2422                         dev->passiveGarbageCollections++;
2423                 }
2424
2425                 T(YAFFS_TRACE_GC,(TSTR("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),dev->nErasedBlocks,aggressive));
2426
2427                 return yaffs_GarbageCollectBlock(dev,block);
2428         }
2429
2430         return aggressive ? YAFFS_FAIL : YAFFS_OK;
2431 }
2432
2433
2434 //////////////////////////// TAGS ///////////////////////////////////////
2435
2436 static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr)
2437 {
2438         yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
2439
2440         yaffs_CalcTagsECC(tagsPtr);
2441
2442         sparePtr->tagByte0 = tu->asBytes[0];
2443         sparePtr->tagByte1 = tu->asBytes[1];
2444         sparePtr->tagByte2 = tu->asBytes[2];
2445         sparePtr->tagByte3 = tu->asBytes[3];
2446         sparePtr->tagByte4 = tu->asBytes[4];
2447         sparePtr->tagByte5 = tu->asBytes[5];
2448         sparePtr->tagByte6 = tu->asBytes[6];
2449         sparePtr->tagByte7 = tu->asBytes[7];
2450 }
2451
2452 static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr)
2453 {
2454         yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
2455         int result;
2456
2457         tu->asBytes[0]= sparePtr->tagByte0;
2458         tu->asBytes[1]= sparePtr->tagByte1;
2459         tu->asBytes[2]= sparePtr->tagByte2;
2460         tu->asBytes[3]= sparePtr->tagByte3;
2461         tu->asBytes[4]= sparePtr->tagByte4;
2462         tu->asBytes[5]= sparePtr->tagByte5;
2463         tu->asBytes[6]= sparePtr->tagByte6;
2464         tu->asBytes[7]= sparePtr->tagByte7;
2465
2466         result =  yaffs_CheckECCOnTags(tagsPtr);
2467         if(result> 0)
2468         {
2469                 dev->tagsEccFixed++;
2470         }
2471         else if(result <0)
2472         {
2473                 dev->tagsEccUnfixed++;
2474         }
2475 }
2476
2477 static void yaffs_SpareInitialise(yaffs_Spare *spare)
2478 {
2479         memset(spare,0xFF,sizeof(yaffs_Spare));
2480 }
2481
2482 static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted)
2483 {
2484         if(tags)
2485         {
2486                 yaffs_Spare spare;
2487                 if(yaffs_ReadChunkFromNAND(dev,chunkInNAND,NULL,&spare,1) == YAFFS_OK)
2488                 {
2489                         *chunkDeleted = (yaffs_CountBits(spare.pageStatus) < 7) ? 1 : 0;
2490                         yaffs_GetTagsFromSpare(dev,&spare,tags);
2491                         return YAFFS_OK;
2492                 }
2493                 else
2494                 {
2495                         return YAFFS_FAIL;
2496                 }
2497         }
2498
2499         return YAFFS_OK;
2500 }
2501
2502 #if 0
2503 static int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *buffer, yaffs_Tags *tags)
2504 {
2505         // NB There must be tags, data is optional
2506         // If there is data, then an ECC is calculated on it.
2507
2508         yaffs_Spare spare;
2509
2510         if(!tags)
2511         {
2512                 return YAFFS_FAIL;
2513         }
2514
2515         yaffs_SpareInitialise(&spare);
2516
2517         if(!dev->useNANDECC && buffer)
2518         {
2519                 yaffs_CalcECC(buffer,&spare);
2520         }
2521
2522         yaffs_LoadTagsIntoSpare(&spare,tags);
2523
2524         return yaffs_WriteChunkToNAND(dev,chunkInNAND,buffer,&spare);
2525
2526 }
2527 #endif
2528
2529
2530 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_Tags *tags, int useReserve)
2531 {
2532         // NB There must be tags, data is optional
2533         // If there is data, then an ECC is calculated on it.
2534
2535         yaffs_Spare spare;
2536
2537         if(!tags)
2538         {
2539                 return YAFFS_FAIL;
2540         }
2541
2542         yaffs_SpareInitialise(&spare);
2543
2544         if(!dev->useNANDECC && buffer)
2545         {
2546                 yaffs_CalcECC(buffer,&spare);
2547         }
2548
2549         yaffs_LoadTagsIntoSpare(&spare,tags);
2550
2551         return yaffs_WriteNewChunkToNAND(dev,buffer,&spare,useReserve);
2552
2553 }
2554
2555 static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted)
2556 {
2557         return  (  tags->chunkId == chunkInObject &&
2558                            tags->objectId == objectId &&
2559                            !chunkDeleted) ? 1 : 0;
2560
2561 }
2562
2563
2564
2565 int yaffs_FindChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags)
2566 {
2567         //Get the Tnode, then get the level 0 offset chunk offset
2568     yaffs_Tnode *tn;
2569     int theChunk = -1;
2570     yaffs_Tags localTags;
2571     int i;
2572     int found = 0;
2573     int chunkDeleted;
2574
2575     yaffs_Device *dev = in->myDev;
2576
2577
2578     if(!tags)
2579     {
2580         // Passed a NULL, so use our own tags space
2581         tags = &localTags;
2582     }
2583
2584     tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
2585
2586     if(tn)
2587     {
2588                 theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
2589
2590                 // Now we need to do the shifting etc and search for it
2591                 for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++)
2592                 {
2593                         yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted);
2594                         if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted))
2595                         {
2596                                 // found it;
2597                                 found = 1;
2598                         }
2599                         else
2600                         {
2601                                 theChunk++;
2602                         }
2603                 }
2604     }
2605     return found ? theChunk : -1;
2606 }
2607
2608 int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags)
2609 {
2610         //Get the Tnode, then get the level 0 offset chunk offset
2611     yaffs_Tnode *tn;
2612     int theChunk = -1;
2613     yaffs_Tags localTags;
2614     int i;
2615     int found = 0;
2616     yaffs_Device *dev = in->myDev;
2617     int chunkDeleted;
2618
2619     if(!tags)
2620     {
2621         // Passed a NULL, so use our own tags space
2622         tags = &localTags;
2623     }
2624
2625     tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
2626
2627     if(tn)
2628     {
2629
2630                 theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
2631
2632                 // Now we need to do the shifting etc and search for it
2633                 for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++)
2634                 {
2635                         yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted);
2636                         if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted))
2637                         {
2638                                 // found it;
2639                                 found = 1;
2640                         }
2641                         else
2642                         {
2643                                 theChunk++;
2644                         }
2645                 }
2646
2647                 // Delete the entry in the filestructure
2648                 if(found)
2649                 {
2650                         tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = 0;
2651                 }
2652     }
2653     else
2654     {
2655         //T(("No level 0 found for %d\n", chunkInInode));
2656     }
2657
2658     if(!found)
2659     {
2660         //T(("Could not find %d to delete\n",chunkInInode));
2661     }
2662     return found ? theChunk : -1;
2663 }
2664
2665
2666 #ifdef YAFFS_PARANOID
2667
2668 static int yaffs_CheckFileSanity(yaffs_Object *in)
2669 {
2670         int chunk;
2671         int nChunks;
2672         int fSize;
2673         int failed = 0;
2674         int objId;
2675         yaffs_Tnode *tn;
2676     yaffs_Tags localTags;
2677     yaffs_Tags *tags = &localTags;
2678     int theChunk;
2679     int chunkDeleted;
2680
2681
2682         if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
2683         {
2684                 //T(("Object not a file\n"));
2685                 return YAFFS_FAIL;
2686         }
2687
2688         objId = in->objectId;
2689         fSize  = in->variant.fileVariant.fileSize;
2690         nChunks = (fSize + in->myDev->nBytesPerChunk -1)/in->myDev->nBytesPerChunk;
2691
2692         for(chunk = 1; chunk <= nChunks; chunk++)
2693         {
2694                 tn = yaffs_FindLevel0Tnode(in->myDev,&in->variant.fileVariant, chunk);
2695
2696                 if(tn)
2697                 {
2698
2699                         theChunk = tn->level0[chunk & YAFFS_TNODES_LEVEL0_MASK] << in->myDev->chunkGroupBits;
2700
2701
2702                                 yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,tags,&chunkDeleted);
2703                                 if(yaffs_TagsMatch(tags,in->objectId,chunk,chunkDeleted))
2704                                 {
2705                                         // found it;
2706
2707                                 }
2708                                 else
2709                                 {
2710                                         //T(("File problem file [%d,%d] NAND %d  tags[%d,%d]\n",
2711                                         //              objId,chunk,theChunk,tags->chunkId,tags->objectId);
2712
2713                                         failed = 1;
2714
2715                                 }
2716
2717                 }
2718                 else
2719                 {
2720                         //T(("No level 0 found for %d\n", chunk));
2721                 }
2722         }
2723
2724         return failed ? YAFFS_FAIL : YAFFS_OK;
2725 }
2726
2727 #endif
2728
2729 static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan)
2730 {
2731         yaffs_Tnode *tn;
2732         yaffs_Device *dev = in->myDev;
2733         int existingChunk;
2734         yaffs_Tags existingTags;
2735         yaffs_Tags newTags;
2736         unsigned existingSerial, newSerial;
2737
2738         int newChunkDeleted;
2739
2740
2741         tn = yaffs_AddOrFindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
2742         if(!tn)
2743         {
2744                 return YAFFS_FAIL;
2745         }
2746
2747         existingChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK];
2748
2749         if(inScan)
2750         {
2751                 // If we're scanning then we need to test for duplicates
2752                 // NB This does not need to be efficient since it should only ever
2753                 // happen when the power fails during a write, then only one
2754                 // chunk should ever be affected.
2755
2756
2757                 if(existingChunk != 0)
2758                 {
2759                         // NB Right now existing chunk will not be real chunkId if the device >= 32MB
2760                         //    thus we have to do a FindChunkInFile to get the real chunk id.
2761                         //
2762                         // We have a duplicate now we need to decide which one to use
2763                         // To do this we get both sets of tags and compare serial numbers.
2764                         yaffs_ReadChunkTagsFromNAND(dev,chunkInNAND, &newTags,&newChunkDeleted);
2765
2766
2767                         // Do a proper find
2768                         existingChunk = yaffs_FindChunkInFile(in,chunkInInode, &existingTags);
2769
2770                         if(existingChunk <=0)
2771                         {
2772                                 //Hoosterman - how did this happen?
2773
2774                                 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: existing chunk < 0 in scan" TENDSTR)));
2775
2776                         }
2777
2778
2779                         // NB The deleted flags should be false, otherwise the chunks will
2780                         // not be loaded during a scan
2781
2782                         newSerial = newTags.serialNumber;
2783                         existingSerial = existingTags.serialNumber;
2784
2785                         if( existingChunk <= 0 ||
2786                             ((existingSerial+1) & 3) == newSerial)
2787                         {
2788                                 // Use new
2789                                 // Delete the old one and drop through to update the tnode
2790                                 yaffs_DeleteChunk(dev,existingChunk,1);
2791                         }
2792                         else
2793                         {
2794                                 // Use existing.
2795                                 // Delete the new one and return early so that the tnode isn't changed
2796                                 yaffs_DeleteChunk(dev,chunkInNAND,1);
2797                                 return YAFFS_OK;
2798                         }
2799                 }
2800
2801         }
2802
2803         if(existingChunk == 0)
2804         {
2805                 in->nDataChunks++;
2806         }
2807
2808         tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = (chunkInNAND >> dev->chunkGroupBits);
2809
2810         return YAFFS_OK;
2811 }
2812
2813
2814
2815 int yaffs_ReadChunkDataFromObject(yaffs_Object *in,int chunkInInode, __u8 *buffer)
2816 {
2817     int chunkInNAND = yaffs_FindChunkInFile(in,chunkInInode,NULL);
2818
2819     if(chunkInNAND >= 0)
2820     {
2821                 return yaffs_ReadChunkFromNAND(in->myDev,chunkInNAND,buffer,NULL,1);
2822         }
2823         else
2824         {
2825                 return 0;
2826         }
2827
2828 }
2829
2830
2831 static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId,int markNAND)
2832 {
2833         int block;
2834         int page;
2835         yaffs_Spare spare;
2836         yaffs_BlockInfo *bi;
2837
2838         if(chunkId <= 0) return;
2839
2840         dev->nDeletions++;
2841         block = chunkId / dev->nChunksPerBlock;
2842         page = chunkId % dev->nChunksPerBlock;
2843
2844         if(markNAND)
2845         {
2846                 yaffs_SpareInitialise(&spare);
2847
2848                 spare.pageStatus = 0; // To mark it as deleted.
2849
2850
2851                 yaffs_WriteChunkToNAND(dev,chunkId,NULL,&spare);
2852                 yaffs_HandleUpdateChunk(dev,chunkId,&spare);
2853         }
2854         else
2855         {
2856                         dev->nUnmarkedDeletions++;
2857         }
2858
2859         bi = yaffs_GetBlockInfo(dev,block);
2860
2861
2862         // Pull out of the management area.
2863         // If the whole block became dirty, this will kick off an erasure.
2864         if(     bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
2865             bi->blockState == YAFFS_BLOCK_STATE_FULL)
2866         {
2867                 dev->nFreeChunks++;
2868
2869                 yaffs_ClearChunkBit(dev,block,page);
2870                 bi->pagesInUse--;
2871
2872                 if(bi->pagesInUse == 0 &&
2873                bi->blockState == YAFFS_BLOCK_STATE_FULL)
2874             {
2875                 yaffs_BlockBecameDirty(dev,block);
2876             }
2877
2878         }
2879         else
2880         {
2881                 // T(("Bad news deleting chunk %d\n",chunkId));
2882         }
2883
2884 }
2885
2886
2887
2888
2889 int yaffs_WriteChunkDataToObject(yaffs_Object *in,int chunkInInode, const __u8 *buffer,int nBytes,int useReserve)
2890 {
2891         // Find old chunk Need to do this to get serial number
2892         // Write new one and patch into tree.
2893         // Invalidate old tags.
2894
2895     int prevChunkId;
2896     yaffs_Tags prevTags;
2897
2898     int newChunkId;
2899     yaffs_Tags newTags;
2900
2901     yaffs_Device *dev = in->myDev;
2902
2903         yaffs_CheckGarbageCollection(dev);
2904
2905         // Get the previous chunk at this location in the file if it exists
2906     prevChunkId  = yaffs_FindChunkInFile(in,chunkInInode,&prevTags);
2907
2908     // Set up new tags
2909         newTags.chunkId = chunkInInode;
2910         newTags.objectId = in->objectId;
2911         newTags.serialNumber = (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
2912         newTags.byteCount = nBytes;
2913         newTags.unusedStuff = 0xFFFFFFFF;
2914
2915         yaffs_CalcTagsECC(&newTags);
2916
2917         newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags,useReserve);
2918         if(newChunkId >= 0)
2919         {
2920                 yaffs_PutChunkIntoFile(in,chunkInInode,newChunkId,0);
2921
2922
2923                 if(prevChunkId >= 0)
2924                 {
2925                         yaffs_DeleteChunk(dev,prevChunkId,1);
2926
2927                 }
2928
2929                 yaffs_CheckFileSanity(in);
2930         }
2931         return newChunkId;
2932
2933
2934
2935
2936
2937 }
2938
2939
2940 // UpdateObjectHeader updates the header on NAND for an object.
2941 // If name is not NULL, then that new name is used.
2942 //
2943 int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name, int force)
2944 {
2945
2946         yaffs_Device *dev = in->myDev;
2947
2948     int prevChunkId;
2949
2950     int newChunkId;
2951     yaffs_Tags newTags;
2952     __u8 bufferNew[YAFFS_BYTES_PER_CHUNK];
2953     __u8 bufferOld[YAFFS_BYTES_PER_CHUNK];
2954
2955     yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)bufferNew;
2956     yaffs_ObjectHeader *ohOld = (yaffs_ObjectHeader *)bufferOld;
2957
2958
2959     if(!in->fake || force)
2960     {
2961
2962                 yaffs_CheckGarbageCollection(dev);
2963
2964                 memset(bufferNew,0xFF,YAFFS_BYTES_PER_CHUNK);
2965
2966                 prevChunkId = in->chunkId;
2967
2968                 if(prevChunkId >= 0)
2969                 {
2970                         yaffs_ReadChunkFromNAND(dev,prevChunkId,bufferOld,NULL,1);
2971                 }
2972
2973                 // Header data
2974                 oh->type = in->variantType;
2975
2976                 oh->st_mode = in->st_mode;
2977
2978 #ifdef CONFIG_YAFFS_WINCE
2979                 oh->win_atime[0] = in->win_atime[0];
2980                 oh->win_ctime[0] = in->win_ctime[0];
2981                 oh->win_mtime[0] = in->win_mtime[0];
2982                 oh->win_atime[1] = in->win_atime[1];
2983                 oh->win_ctime[1] = in->win_ctime[1];
2984                 oh->win_mtime[1] = in->win_mtime[1];
2985 #else
2986                 oh->st_uid = in->st_uid;
2987                 oh->st_gid = in->st_gid;
2988                 oh->st_atime = in->st_atime;
2989                 oh->st_mtime = in->st_mtime;
2990                 oh->st_ctime = in->st_ctime;
2991                 oh->st_rdev = in->st_rdev;
2992 #endif
2993                 if(in->parent)
2994                 {
2995                         oh->parentObjectId = in->parent->objectId;
2996                 }
2997                 else
2998                 {
2999                         oh->parentObjectId = 0;
3000                 }
3001
3002                 //oh->sum = in->sum;
3003                 if(name && *name)
3004                 {
3005                         memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1);
3006                         strncpy(oh->name,name,YAFFS_MAX_NAME_LENGTH);
3007                 }
3008                 else if(prevChunkId)
3009                 {
3010                         memcpy(oh->name, ohOld->name,YAFFS_MAX_NAME_LENGTH + 1);
3011                 }
3012                 else
3013                 {
3014                         memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1);
3015                 }
3016
3017                 switch(in->variantType)
3018                 {
3019                         case YAFFS_OBJECT_TYPE_UNKNOWN:
3020                                 // Should not happen
3021                                 break;
3022                         case YAFFS_OBJECT_TYPE_FILE:
3023                                 oh->fileSize = in->variant.fileVariant.fileSize;
3024                                 break;
3025                         case YAFFS_OBJECT_TYPE_HARDLINK:
3026                                 oh->equivalentObjectId = in->variant.hardLinkVariant.equivalentObjectId;
3027                                 break;
3028                         case YAFFS_OBJECT_TYPE_SPECIAL:
3029                                 // Do nothing
3030                                 break;
3031                         case YAFFS_OBJECT_TYPE_DIRECTORY:
3032                                 // Do nothing
3033                                 break;
3034                         case YAFFS_OBJECT_TYPE_SYMLINK:
3035                                 strncpy(oh->alias,in->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
3036                                 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3037                                 break;
3038                 }
3039
3040                 // Tags
3041                 in->serial++;
3042                 newTags.chunkId = 0;
3043                 newTags.objectId = in->objectId;
3044                 newTags.serialNumber = in->serial;
3045                 newTags.byteCount =   0xFFFFFFFF;
3046                 newTags.unusedStuff = 0xFFFFFFFF;
3047
3048                 yaffs_CalcTagsECC(&newTags);
3049
3050
3051                 // Create new chunk in NAND
3052                 newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,bufferNew,&newTags, (prevChunkId >= 0) ? 1 : 0 );
3053
3054                 if(newChunkId >= 0)
3055                 {
3056
3057                         in->chunkId = newChunkId;
3058
3059                         if(prevChunkId >= 0)
3060                         {
3061                                 yaffs_DeleteChunk(dev,prevChunkId,1);
3062                         }
3063
3064                         in->dirty = 0;
3065                 }
3066
3067                 return newChunkId;
3068
3069     }
3070     return 0;
3071 }
3072
3073
3074 /////////////////////// Short Operations Cache ////////////////////////////////
3075 //      In many siturations where there is no high level buffering (eg WinCE) a lot of
3076 //      reads might be short sequential reads, and a lot of writes may be short
3077 //  sequential writes. eg. scanning/writing a jpeg file.
3078 //      In these cases, a short read/write cache can provide a huge perfomance benefit
3079 //  with dumb-as-a-rock code.
3080 //  There are a limited number (~10) of cache chunks per device so that we don't
3081 //  need a very intelligent search.
3082
3083
3084
3085
3086
3087 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
3088 {
3089         yaffs_Device *dev = obj->myDev;
3090         int lowest;
3091         int i;
3092         yaffs_ChunkCache *cache;
3093         int chunkWritten;
3094         int nBytes;
3095         int nCaches = obj->myDev->nShortOpCaches;
3096
3097         if  (nCaches > 0)
3098         {
3099                 do{
3100                         cache = NULL;
3101
3102                         // Find the dirty cache for this object with the lowest chunk id.
3103                         for(i = 0; i < nCaches; i++)
3104                         {
3105                                 if(dev->srCache[i].object == obj &&
3106                                 dev->srCache[i].dirty)
3107                                 {
3108                                         if(!cache ||  dev->srCache[i].chunkId < lowest)
3109                                         {
3110                                                 cache = &dev->srCache[i];
3111                                                 lowest = cache->chunkId;
3112                                         }
3113                                 }
3114                         }
3115
3116                         if(cache)
3117                         {
3118                                 //Write it out
3119
3120 #if 0
3121                                 nBytes = cache->object->variant.fileVariant.fileSize - ((cache->chunkId -1) * YAFFS_BYTES_PER_CHUNK);
3122
3123                                 if(nBytes > YAFFS_BYTES_PER_CHUNK)
3124                                 {
3125                                         nBytes= YAFFS_BYTES_PER_CHUNK;
3126                                 }
3127 #endif
3128                                 chunkWritten = yaffs_WriteChunkDataToObject(cache->object,
3129                                                                                                                         cache->chunkId,
3130                                                                                                                         cache->data,
3131                                                                                                                         cache->nBytes,1);
3132
3133                                 cache->dirty = 0;
3134                                 cache->object = NULL;
3135                         }
3136
3137                 } while(cache && chunkWritten > 0);
3138
3139                 if(cache)
3140                 {
3141                         //Hoosterman, disk full while writing cache out.
3142                         T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3143
3144                 }
3145         }
3146
3147 }
3148
3149
3150 // Grab us a chunk for use.
3151 // First look for an empty one.
3152 // Then look for the least recently used non-dirty one.
3153 // Then look for the least recently used dirty one...., flush and look again.
3154 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
3155 {
3156         int i;
3157         int usage;
3158         int theOne;
3159
3160         if(dev->nShortOpCaches > 0)
3161         {
3162                 for(i = 0; i < dev->nShortOpCaches; i++)
3163                 {
3164                         if(!dev->srCache[i].object)
3165                         {
3166                                 //T(("Grabbing empty %d\n",i));
3167
3168                                 //printf("Grabbing empty %d\n",i);
3169
3170                                 return &dev->srCache[i];
3171                         }
3172                 }
3173
3174                 return NULL;
3175
3176                 theOne = -1;
3177                 usage = 0; // just to stop the compiler grizzling
3178
3179                 for(i = 0; i < dev->nShortOpCaches; i++)
3180                 {
3181                         if(!dev->srCache[i].dirty &&
3182                         ((dev->srCache[i].lastUse < usage  && theOne >= 0)||
3183                                 theOne < 0))
3184                         {
3185                                 usage = dev->srCache[i].lastUse;
3186                                 theOne = i;
3187                         }
3188                 }
3189
3190                 //T(("Grabbing non-empty %d\n",theOne));
3191
3192                 //if(theOne >= 0) printf("Grabbed non-empty cache %d\n",theOne);
3193
3194                 return  theOne >= 0 ?  &dev->srCache[theOne] : NULL;
3195         }
3196         else
3197         {
3198                 return NULL;
3199         }
3200
3201 }
3202
3203
3204 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
3205 {
3206         yaffs_ChunkCache *cache;
3207         yaffs_Object *theObj;
3208         int usage;
3209         int i;
3210         int pushout;
3211
3212         if(dev->nShortOpCaches > 0)
3213         {
3214                 // Try find a non-dirty one...
3215
3216                 cache = yaffs_GrabChunkCacheWorker(dev);
3217
3218                 if(!cache)
3219                 {
3220                         // They were all dirty, find the last recently used object and flush
3221                         // its cache, then  find again.
3222                         // NB what's here is not very accurate, we actually flush the object
3223                         // the last recently used page.
3224
3225                         theObj = dev->srCache[0].object;
3226                         usage = dev->srCache[0].lastUse;
3227                         cache = &dev->srCache[0];
3228                         pushout = 0;
3229
3230                         for(i = 1; i < dev->nShortOpCaches; i++)
3231                         {
3232                                 if( dev->srCache[i].object &&
3233                                         dev->srCache[i].lastUse < usage)
3234                                 {
3235                                         usage  = dev->srCache[i].lastUse;
3236                                         theObj = dev->srCache[i].object;
3237                                         cache = &dev->srCache[i];
3238                                         pushout = i;
3239                                 }
3240                         }
3241
3242                         if(!cache || cache->dirty)
3243                         {
3244
3245                                 //printf("Dirty ");
3246                                 yaffs_FlushFilesChunkCache(theObj);
3247
3248                                 // Try again
3249                                 cache = yaffs_GrabChunkCacheWorker(dev);
3250                         }
3251                         else
3252                         {
3253                                 //printf(" pushout %d\n",pushout);
3254                         }
3255
3256                 }
3257
3258                 return cache;
3259         }
3260         else
3261                 return NULL;
3262
3263 }
3264
3265
3266 // Find a cached chunk
3267 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj, int chunkId)
3268 {
3269         yaffs_Device *dev = obj->myDev;
3270         int i;
3271         if(dev->nShortOpCaches > 0)
3272         {
3273                 for(i = 0; i < dev->nShortOpCaches; i++)
3274                 {
3275                         if(dev->srCache[i].object == obj &&
3276                         dev->srCache[i].chunkId == chunkId)
3277                         {
3278                                 dev->cacheHits++;
3279
3280                                 return &dev->srCache[i];
3281                         }
3282                 }
3283         }
3284         return NULL;
3285 }
3286
3287 // Mark the chunk for the least recently used algorithym
3288 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache, int isAWrite)
3289 {
3290
3291         if(dev->nShortOpCaches > 0)
3292         {
3293                 if( dev->srLastUse < 0 ||
3294                         dev->srLastUse > 100000000)
3295                 {
3296                         // Reset the cache usages
3297                         int i;
3298                         for(i = 1; i < dev->nShortOpCaches; i++)
3299                         {
3300                                 dev->srCache[i].lastUse = 0;
3301                         }
3302                         dev->srLastUse = 0;
3303                 }
3304
3305                 dev->srLastUse++;
3306
3307                 cache->lastUse = dev->srLastUse;
3308
3309                 if(isAWrite)
3310                 {
3311                         cache->dirty = 1;
3312                 }
3313         }
3314 }
3315
3316 // Invalidate a single cache page.
3317 // Do this when a whole page gets written,
3318 // ie the short cache for this page is no longer valid.
3319 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
3320 {
3321         if(object->myDev->nShortOpCaches > 0)
3322         {
3323                 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object,chunkId);
3324
3325                 if(cache)
3326                 {
3327                         cache->object = NULL;
3328                 }
3329         }
3330 }
3331
3332
3333 // Invalidate all the cache pages associated with this object
3334 // Do this whenever ther file is deleted or resized.
3335 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
3336 {
3337         int i;
3338         yaffs_Device *dev = in->myDev;
3339
3340         if(dev->nShortOpCaches > 0)
3341         {
3342                 // Now invalidate it.
3343                 for(i = 0; i < dev->nShortOpCaches; i++)
3344                 {
3345                         if(dev->srCache[i].object == in)
3346                         {
3347                                 dev->srCache[i].object = NULL;
3348                         }
3349                 }
3350         }
3351 }
3352
3353
3354
3355
3356
3357 ///////////////////////// File read/write ///////////////////////////////
3358 // Read and write have very similar structures.
3359 // In general the read/write has three parts to it
3360 // * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3361 // * Some complete chunks
3362 // * An incomplete chunk to end off with
3363 //
3364 // Curve-balls: the first chunk might also be the last chunk.
3365
3366 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 * buffer, __u32 offset, int nBytes)
3367 {
3368
3369
3370         int chunk;
3371         int start;
3372         int nToCopy;
3373         int n = nBytes;
3374         int nDone = 0;
3375         yaffs_ChunkCache *cache;
3376
3377         yaffs_Device *dev;
3378
3379         dev = in->myDev;
3380
3381         while(n > 0)
3382         {
3383                 chunk = offset / YAFFS_BYTES_PER_CHUNK + 1; // The first chunk is 1
3384                 start = offset % YAFFS_BYTES_PER_CHUNK;
3385
3386                 // OK now check for the curveball where the start and end are in
3387                 // the same chunk.
3388                 if(     (start + n) < YAFFS_BYTES_PER_CHUNK)
3389                 {
3390                         nToCopy = n;
3391                 }
3392                 else
3393                 {
3394                         nToCopy = YAFFS_BYTES_PER_CHUNK - start;
3395                 }
3396
3397                 cache = yaffs_FindChunkCache(in,chunk);
3398
3399                 // If the chunk is already in the cache or it is less than a whole chunk
3400                 // then use the cache (if there is caching)
3401                 // else bypass the cache.
3402                 if( cache || nToCopy != YAFFS_BYTES_PER_CHUNK)
3403                 {
3404                         if(dev->nShortOpCaches > 0)
3405                         {
3406
3407                                 // If we can't find the data in the cache, then load it up.
3408
3409                                 if(!cache)
3410                                 {
3411                                         cache = yaffs_GrabChunkCache(in->myDev);
3412                                         cache->object = in;
3413                                         cache->chunkId = chunk;
3414                                         cache->dirty = 0;
3415                                         yaffs_ReadChunkDataFromObject(in,chunk,cache->data);
3416                                         cache->nBytes = 0;
3417                                 }
3418
3419                                 yaffs_UseChunkCache(dev,cache,0);
3420
3421                                 memcpy(buffer,&cache->data[start],nToCopy);
3422                         }
3423                         else
3424                         {
3425                                 // Read into the local buffer then copy...
3426                                 yaffs_ReadChunkDataFromObject(in,chunk,dev->localBuffer);
3427                                 memcpy(buffer,&dev->localBuffer[start],nToCopy);
3428                         }
3429
3430                 }
3431                 else
3432                 {
3433 #ifdef CONFIG_YAFFS_WINCE
3434
3435                         // Under WinCE can't do direct transfer. Need to use a local buffer.
3436                         // This is because we otherwise screw up WinCE's memory mapper
3437                         yaffs_ReadChunkDataFromObject(in,chunk,dev->localBuffer);
3438                         memcpy(buffer,dev->localBuffer,YAFFS_BYTES_PER_CHUNK);
3439 #else
3440                         // A full chunk. Read directly into the supplied buffer.
3441                         yaffs_ReadChunkDataFromObject(in,chunk,buffer);
3442 #endif
3443                 }
3444
3445                 n -= nToCopy;
3446                 offset += nToCopy;
3447                 buffer += nToCopy;
3448                 nDone += nToCopy;
3449
3450         }
3451
3452         return nDone;
3453 }
3454
3455
3456
3457 int yaffs_WriteDataToFile(yaffs_Object *in,const __u8 * buffer, __u32 offset, int nBytes)
3458 {
3459
3460         int chunk;
3461         int start;
3462         int nToCopy;
3463         int n = nBytes;
3464         int nDone = 0;
3465         int nToWriteBack;
3466         int startOfWrite = offset;
3467         int chunkWritten = 0;
3468         int nBytesRead;
3469
3470         yaffs_Device *dev;
3471
3472         dev = in->myDev;
3473
3474
3475         while(n > 0 && chunkWritten >= 0)
3476         {
3477                 chunk = offset / YAFFS_BYTES_PER_CHUNK + 1;
3478                 start = offset % YAFFS_BYTES_PER_CHUNK;
3479
3480
3481                 // OK now check for the curveball where the start and end are in
3482                 // the same chunk.
3483
3484                 if(     (start + n) < YAFFS_BYTES_PER_CHUNK)
3485                 {
3486                         nToCopy = n;
3487
3488                         // Now folks, to calculate how many bytes to write back....
3489                         // If we're overwriting and not writing to then end of file then
3490                         // we need to write back as much as was there before.
3491
3492                         nBytesRead = in->variant.fileVariant.fileSize - ((chunk -1) * YAFFS_BYTES_PER_CHUNK);
3493
3494                         if(nBytesRead > YAFFS_BYTES_PER_CHUNK)
3495                         {
3496                                 nBytesRead = YAFFS_BYTES_PER_CHUNK;
3497                         }
3498
3499                         nToWriteBack = (nBytesRead > (start + n)) ? nBytesRead : (start +n);
3500
3501                 }
3502                 else
3503                 {
3504                         nToCopy = YAFFS_BYTES_PER_CHUNK - start;
3505                         nToWriteBack = YAFFS_BYTES_PER_CHUNK;
3506                 }
3507
3508                 if(nToCopy != YAFFS_BYTES_PER_CHUNK)
3509                 {
3510                         // An incomplete start or end chunk (or maybe both start and end chunk)
3511                         if(dev->nShortOpCaches > 0)
3512                         {
3513                                 yaffs_ChunkCache *cache;
3514                                 // If we can't find the data in the cache, then load it up.
3515                                 cache = yaffs_FindChunkCache(in,chunk);
3516                                 if(!cache && yaffs_CheckSpaceForChunkCache(in->myDev))
3517                                 {
3518                                         cache = yaffs_GrabChunkCache(in->myDev);
3519                                         cache->object = in;
3520                                         cache->chunkId = chunk;
3521                                         cache->dirty = 0;
3522                                         yaffs_ReadChunkDataFromObject(in,chunk,cache->data);
3523                                 }
3524
3525                                 if(cache)
3526                                 {
3527                                         yaffs_UseChunkCache(dev,cache,1);
3528                                         memcpy(&cache->data[start],buffer,nToCopy);
3529                                         cache->nBytes = nToWriteBack;
3530                                 }
3531                                 else
3532                                 {
3533                                         chunkWritten = -1; // fail the write
3534                                 }
3535                         }
3536                         else
3537                         {
3538                                 // An incomplete start or end chunk (or maybe both start and end chunk)
3539                                 // Read into the local buffer then copy, then copy over and write back.
3540
3541                                 yaffs_ReadChunkDataFromObject(in,chunk,dev->localBuffer);
3542
3543                                 memcpy(&dev->localBuffer[start],buffer,nToCopy);
3544
3545                                 chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,dev->localBuffer,nToWriteBack,0);
3546
3547                                 //T(("Write with readback to chunk %d %d  start %d  copied %d wrote back %d\n",chunk,chunkWritten,start, nToCopy, nToWriteBack));
3548                         }
3549
3550                 }
3551                 else
3552                 {
3553
3554 #ifdef CONFIG_YAFFS_WINCE
3555                         // Under WinCE can't do direct transfer. Need to use a local buffer.
3556                         // This is because we otherwise screw up WinCE's memory mapper
3557                         memcpy(dev->localBuffer,buffer,YAFFS_BYTES_PER_CHUNK);
3558                         chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,dev->localBuffer,YAFFS_BYTES_PER_CHUNK,0);
3559 #else
3560                         // A full chunk. Write directly from the supplied buffer.
3561                         chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,buffer,YAFFS_BYTES_PER_CHUNK,0);
3562 #endif
3563                         // Since we've overwritten the cached data, we better invalidate it.
3564                         yaffs_InvalidateChunkCache(in,chunk);
3565                         //T(("Write to chunk %d %d\n",chunk,chunkWritten));
3566                 }
3567
3568                 if(chunkWritten >= 0)
3569                 {
3570                         n -= nToCopy;
3571                         offset += nToCopy;
3572                         buffer += nToCopy;
3573                         nDone += nToCopy;
3574                 }
3575
3576         }
3577
3578         // Update file object
3579
3580         if((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
3581         {
3582                 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
3583         }
3584
3585         in->dirty = 1;
3586
3587         return nDone;
3588 }
3589
3590
3591 int yaffs_ResizeFile(yaffs_Object *in, int newSize)
3592 {
3593         int i;
3594         int chunkId;
3595         int oldFileSize = in->variant.fileVariant.fileSize;
3596         int sizeOfPartialChunk = newSize % YAFFS_BYTES_PER_CHUNK;
3597
3598         yaffs_Device *dev = in->myDev;
3599
3600
3601         yaffs_FlushFilesChunkCache(in);
3602         yaffs_InvalidateWholeChunkCache(in);
3603
3604         if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
3605         {
3606                 return yaffs_GetFileSize(in);
3607         }
3608
3609         if(newSize < oldFileSize)
3610         {
3611
3612                 int lastDel = 1 + (oldFileSize-1)/YAFFS_BYTES_PER_CHUNK;
3613
3614                 int startDel = 1 + (newSize + YAFFS_BYTES_PER_CHUNK - 1)/
3615                                                         YAFFS_BYTES_PER_CHUNK;
3616
3617                 // Delete backwards so that we don't end up with holes if
3618                 // power is lost part-way through the operation.
3619                 for(i = lastDel; i >= startDel; i--)
3620                 {
3621                         // NB this could be optimised somewhat,
3622                         // eg. could retrieve the tags and write them without
3623                         // using yaffs_DeleteChunk
3624
3625                         chunkId = yaffs_FindAndDeleteChunkInFile(in,i,NULL);
3626                         if(chunkId < (dev->startBlock * 32) || chunkId >= ((dev->endBlock+1) * 32))
3627                         {
3628                                 //T(("Found daft chunkId %d for %d\n",chunkId,i));
3629                         }
3630                         else
3631                         {
3632                                 in->nDataChunks--;
3633                                 yaffs_DeleteChunk(dev,chunkId,1);
3634                         }
3635                 }
3636
3637
3638                 if(sizeOfPartialChunk != 0)
3639                 {
3640                         int lastChunk = 1+ newSize/YAFFS_BYTES_PER_CHUNK;
3641
3642                         // Got to read and rewrite the last chunk with its new size.
3643                         yaffs_ReadChunkDataFromObject(in,lastChunk,dev->localBuffer);
3644
3645                         yaffs_WriteChunkDataToObject(in,lastChunk,dev->localBuffer,sizeOfPartialChunk,1);
3646
3647                 }
3648
3649                 in->variant.fileVariant.fileSize = newSize;
3650
3651                 yaffs_PruneFileStructure(dev,&in->variant.fileVariant);
3652
3653                 return newSize;
3654
3655         }
3656         else
3657         {
3658                 return oldFileSize;
3659         }
3660 }
3661
3662
3663 loff_t yaffs_GetFileSize(yaffs_Object *obj)
3664 {
3665         obj = yaffs_GetEquivalentObject(obj);
3666
3667         switch(obj->variantType)
3668         {
3669                 case YAFFS_OBJECT_TYPE_FILE:
3670                         return obj->variant.fileVariant.fileSize;
3671                 case YAFFS_OBJECT_TYPE_SYMLINK:
3672                         return strlen(obj->variant.symLinkVariant.alias);
3673                 default:
3674                         return 0;
3675         }
3676 }
3677
3678
3679
3680 // yaffs_FlushFile() updates the file's
3681 // objectId in NAND
3682
3683 int yaffs_FlushFile(yaffs_Object *in, int updateTime)
3684 {
3685         int retVal;
3686         if(in->dirty)
3687         {
3688                 //T(("flushing object header\n"));
3689
3690                 yaffs_FlushFilesChunkCache(in);
3691                 if(updateTime)
3692                 {
3693 #ifdef CONFIG_YAFFS_WINCE
3694                         yfsd_WinFileTimeNow(in->win_mtime);
3695 #else
3696                         in->st_mtime = CURRENT_TIME;
3697 #endif
3698                 }
3699
3700                 retVal = (yaffs_UpdateObjectHeader(in,NULL,0) >= 0)? YAFFS_OK : YAFFS_FAIL;
3701         }
3702         else
3703         {
3704                 retVal = YAFFS_OK;
3705         }
3706
3707         return retVal;
3708
3709 }
3710
3711
3712 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
3713 {
3714
3715         // First off, invalidate the file's data in the cache, without flushing.
3716         yaffs_InvalidateWholeChunkCache(in);
3717
3718         yaffs_RemoveObjectFromDirectory(in);
3719         yaffs_DeleteChunk(in->myDev,in->chunkId,1);
3720 #ifdef __KERNEL__
3721         if(in->myInode)
3722         {
3723                 in->myInode->u.generic_ip = NULL;
3724                 in->myInode = 0;
3725         }
3726 #endif
3727         yaffs_FreeObject(in);
3728         return YAFFS_OK;
3729
3730 }
3731
3732 // yaffs_DeleteFile deletes the whole file data
3733 // and the inode associated with the file.
3734 // It does not delete the links associated with the file.
3735 static int yaffs_UnlinkFile(yaffs_Object *in)
3736 {
3737
3738 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND_DELETION
3739
3740         // Delete the file data & tnodes
3741
3742          yaffs_DeleteWorker(in, in->variant.fileVariant.top, in->variant.fileVariant.topLevel, 0,NULL);
3743
3744
3745         yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);
3746
3747         return  yaffs_DoGenericObjectDeletion(in);
3748 #else
3749         int retVal;
3750         int immediateDeletion=0;
3751         retVal = yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,NULL,0);
3752         if(1 || // Ignore the result of the change name. This will only fail
3753                         // if the disk was completely full (an error condition)
3754                         // We ignore the error so we can delete files to recover the disk
3755            retVal == YAFFS_OK)
3756         {
3757                 //in->unlinked = 1;
3758                 //in->myDev->nUnlinkedFiles++;
3759                 //in->renameAllowed = 0;
3760 #ifdef __KERNEL__
3761                 if(!in->myInode)
3762                 {
3763                         immediateDeletion = 1;
3764
3765                 }
3766 #else
3767                 if(in->inUse <= 0)
3768                 {
3769                         immediateDeletion = 1;
3770
3771                 }
3772 #endif
3773
3774                 if(immediateDeletion)
3775                 {
3776                         T(YAFFS_TRACE_TRACING,(TSTR("yaffs: immediate deletion of file %d" TENDSTR),in->objectId));
3777                         in->deleted=1;
3778                         in->myDev->nDeletedFiles++;
3779                         yaffs_SoftDeleteFile(in);
3780                 }
3781
3782         }
3783         return retVal;
3784
3785
3786 #endif
3787 }
3788
3789 int yaffs_DeleteFile(yaffs_Object *in)
3790 {
3791         int retVal = YAFFS_OK;
3792
3793         if(in->nDataChunks > 0)
3794         {
3795                 // Use soft deletion
3796                 if(!in->unlinked)
3797                 {
3798                         retVal = yaffs_UnlinkFile(in);
3799                 }
3800                 if(retVal == YAFFS_OK &&
3801                 in->unlinked &&
3802                 !in->deleted)
3803                 {
3804                         in->deleted = 1;
3805                         in->myDev->nDeletedFiles++;
3806                         yaffs_SoftDeleteFile(in);
3807                 }
3808                 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
3809         }
3810         else
3811         {
3812                 // The file has no data chunks so we toss it immediately
3813                 yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);
3814                 in->variant.fileVariant.top = NULL;
3815                 yaffs_DoGenericObjectDeletion(in);
3816
3817                 return YAFFS_OK;
3818         }
3819 }
3820
3821 static int yaffs_DeleteDirectory(yaffs_Object *in)
3822 {
3823         //First check that the directory is empty.
3824         if(list_empty(&in->variant.directoryVariant.children))
3825         {
3826                 return  yaffs_DoGenericObjectDeletion(in);
3827         }
3828
3829         return YAFFS_FAIL;
3830
3831 }
3832
3833 static int yaffs_DeleteSymLink(yaffs_Object *in)
3834 {
3835         YFREE(in->variant.symLinkVariant.alias);
3836
3837         return  yaffs_DoGenericObjectDeletion(in);
3838 }
3839
3840 static int yaffs_DeleteHardLink(yaffs_Object *in)
3841 {
3842         // remove this hardlink from the list assocaited with the equivalent
3843         // object
3844         list_del(&in->hardLinks);
3845         return  yaffs_DoGenericObjectDeletion(in);
3846 }
3847
3848
3849 static void yaffs_AbortHalfCreatedObject(yaffs_Object *obj)
3850 {
3851         switch(obj->variantType)
3852         {
3853                 case YAFFS_OBJECT_TYPE_FILE: yaffs_DeleteFile(obj); break;
3854                 case YAFFS_OBJECT_TYPE_DIRECTORY: yaffs_DeleteDirectory(obj); break;
3855                 case YAFFS_OBJECT_TYPE_SYMLINK: yaffs_DeleteSymLink(obj); break;
3856                 case YAFFS_OBJECT_TYPE_HARDLINK: yaffs_DeleteHardLink(obj); break;
3857                 case YAFFS_OBJECT_TYPE_SPECIAL: yaffs_DoGenericObjectDeletion(obj); break;
3858                 case YAFFS_OBJECT_TYPE_UNKNOWN: break; // should not happen.
3859         }
3860 }
3861
3862
3863 static int yaffs_UnlinkWorker(yaffs_Object *obj)
3864 {
3865
3866
3867         if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
3868         {
3869                 return  yaffs_DeleteHardLink(obj);
3870         }
3871         else if(!list_empty(&obj->hardLinks))
3872         {
3873                 // Curve ball: We're unlinking an object that has a hardlink.
3874                 //
3875                 //      This problem arises because we are not strictly following
3876                 //  The Linux link/inode model.
3877                 //
3878                 // We can't really delete the object.
3879                 // Instead, we do the following:
3880                 // - Select a hardlink.
3881                 // - Unhook it from the hard links
3882                 // - Unhook it from its parent directory (so that the rename can work)
3883                 // - Rename the object to the hardlink's name.
3884                 // - Delete the hardlink
3885
3886
3887                 yaffs_Object *hl;
3888                 int retVal;
3889                 char name[YAFFS_MAX_NAME_LENGTH+1];
3890
3891                 hl = list_entry(obj->hardLinks.next,yaffs_Object,hardLinks);
3892
3893                 list_del_init(&hl->hardLinks);
3894                 list_del_init(&hl->siblings);
3895
3896                 yaffs_GetObjectName(hl,name,YAFFS_MAX_NAME_LENGTH+1);
3897
3898                 retVal = yaffs_ChangeObjectName(obj, hl->parent, name,0);
3899
3900                 if(retVal == YAFFS_OK)
3901                 {
3902                         retVal = yaffs_DoGenericObjectDeletion(hl);
3903                 }
3904                 return retVal;
3905
3906         }
3907         else
3908         {
3909                 switch(obj->variantType)
3910                 {
3911                         case YAFFS_OBJECT_TYPE_FILE:
3912                                 return yaffs_UnlinkFile(obj);
3913                                 break;
3914                         case YAFFS_OBJECT_TYPE_DIRECTORY:
3915                                 return yaffs_DeleteDirectory(obj);
3916                                 break;
3917                         case YAFFS_OBJECT_TYPE_SYMLINK:
3918                                 return yaffs_DeleteSymLink(obj);
3919                                 break;
3920                         case YAFFS_OBJECT_TYPE_HARDLINK:
3921                         case YAFFS_OBJECT_TYPE_UNKNOWN:
3922                         default:
3923                                 return YAFFS_FAIL;
3924                 }
3925         }
3926 }
3927
3928 int yaffs_Unlink(yaffs_Object *dir, const char *name)
3929 {
3930         yaffs_Object *obj;
3931
3932          obj = yaffs_FindObjectByName(dir,name);
3933
3934          if(obj && obj->unlinkAllowed)
3935          {
3936                 return yaffs_UnlinkWorker(obj);
3937          }
3938
3939          return YAFFS_FAIL;
3940
3941 }
3942
3943 //////////////// Initialisation Scanning /////////////////
3944
3945
3946
3947 // For now we use the SmartMedia check.
3948 // We look at the blockStatus byte in the first two chunks
3949 // These must be 0xFF to pass as OK.
3950 // todo: this function needs to be modifyable foir different NAND types
3951 // and different chunk sizes.  Suggest make this into a per-device configurable
3952 // function.
3953 static int yaffs_IsBlockBad(yaffs_Device *dev, int blk)
3954 {
3955         yaffs_Spare spare;
3956
3957         yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock,NULL,&spare,1);
3958 #if 1
3959         if(yaffs_CountBits(spare.blockStatus) < 7)
3960         {
3961                 return 1;
3962         }
3963 #else
3964         if(spare.blockStatus != 0xFF)
3965         {
3966                 return 1;
3967         }
3968 #endif
3969         yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock + 1,NULL,&spare,1);
3970
3971 #if 1
3972         if(yaffs_CountBits(spare.blockStatus) < 7)
3973         {
3974                 return 1;
3975         }
3976 #else
3977         if(spare.blockStatus != 0xFF)
3978         {
3979                 return 1;
3980         }
3981 #endif
3982
3983         return 0;
3984
3985 }
3986
3987 static int yaffs_Scan(yaffs_Device *dev)
3988 {
3989         yaffs_Spare spare;
3990         yaffs_Tags tags;
3991         int blk;
3992         int chunk;
3993         int c;
3994         int deleted;
3995         yaffs_BlockState state;
3996         yaffs_Object *hardList = NULL;
3997         yaffs_Object *hl;
3998         yaffs_BlockInfo *bi;
3999
4000
4001         yaffs_ObjectHeader *oh;
4002         yaffs_Object *in;
4003         yaffs_Object *parent;
4004
4005         __u8 chunkData[YAFFS_BYTES_PER_CHUNK];
4006
4007
4008         // Scan all the blocks...
4009
4010         for(blk = dev->startBlock; blk <= dev->endBlock; blk++)
4011         {
4012                 deleted = 0;
4013                 bi = yaffs_GetBlockInfo(dev,blk);
4014                 yaffs_ClearChunkBits(dev,blk);
4015                 bi->pagesInUse = 0;
4016                 bi->softDeletions = 0;
4017                 state = YAFFS_BLOCK_STATE_SCANNING;
4018
4019
4020                 if(yaffs_IsBlockBad(dev,blk))
4021                 {
4022                         state = YAFFS_BLOCK_STATE_DEAD;
4023                         T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("block %d is bad" TENDSTR),blk));
4024                 }
4025
4026                 // Read each chunk in the block.
4027
4028                 for(c = 0; c < dev->nChunksPerBlock &&
4029                                    state == YAFFS_BLOCK_STATE_SCANNING; c++)
4030                 {
4031                         // Read the spare area and decide what to do
4032                         chunk = blk * dev->nChunksPerBlock + c;
4033
4034                         yaffs_ReadChunkFromNAND(dev,chunk,NULL,&spare,1);
4035
4036
4037                         // This block looks ok, now what's in this chunk?
4038                         yaffs_GetTagsFromSpare(dev,&spare,&tags);
4039
4040                         if(yaffs_CountBits(spare.pageStatus) < 6)
4041                         {
4042                                 // A deleted chunk
4043                                 deleted++;
4044                                 dev->nFreeChunks ++;
4045                                 //T((" %d %d deleted\n",blk,c));
4046                         }
4047                         else if(tags.objectId == YAFFS_UNUSED_OBJECT_ID)
4048                         {
4049                                 // An unassigned chunk in the block
4050                                 // This means that either the block is empty or
4051                                 // this is the one being allocated from
4052
4053                                 if(c == 0)
4054                                 {
4055                                         // the block is unused
4056                                         state = YAFFS_BLOCK_STATE_EMPTY;
4057                                         dev->nErasedBlocks++;
4058                                 }
4059                                 else
4060                                 {
4061                                         // this is the block being allocated from
4062                                         T(YAFFS_TRACE_SCAN,(TSTR(" Allocating from %d %d" TENDSTR),blk,c));
4063                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
4064                                         dev->allocationBlock = blk;
4065                                         dev->allocationPage = c;
4066                                 }
4067
4068                                 dev->nFreeChunks += (dev->nChunksPerBlock - c);
4069                         }
4070                         else if(tags.chunkId > 0)
4071                         {
4072                                 int endpos;
4073                                 // A data chunk.
4074                                 yaffs_SetChunkBit(dev,blk,c);
4075                                 bi->pagesInUse++;
4076
4077                                 in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE);
4078                                 // PutChunkIntoFIle checks for a clash (two data chunks with
4079                                 // the same chunkId).
4080                                 yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,1);
4081                                 endpos = (tags.chunkId - 1)* YAFFS_BYTES_PER_CHUNK + tags.byteCount;
4082                                 if(in->variant.fileVariant.scannedFileSize <endpos)
4083                                 {
4084                                         in->variant.fileVariant.scannedFileSize = endpos;
4085 #ifndef CONFIG_YAFFS_USE_HEADER_FILE_SIZE
4086                                                 in->variant.fileVariant.fileSize =
4087                                                         in->variant.fileVariant.scannedFileSize;
4088 #endif
4089
4090                                 }
4091                                 //T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));
4092                         }
4093                         else
4094                         {
4095                                 // chunkId == 0, so it is an ObjectHeader.
4096                                 // Thus, we read in the object header and make the object
4097                                 yaffs_SetChunkBit(dev,blk,c);
4098                                 bi->pagesInUse++;
4099
4100                                 yaffs_ReadChunkFromNAND(dev,chunk,chunkData,NULL,1);
4101
4102                                 oh = (yaffs_ObjectHeader *)chunkData;
4103
4104                                 in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type);
4105
4106                                 if(in->valid)
4107                                 {
4108                                         // We have already filled this one. We have a duplicate and need to resolve it.
4109
4110                                         unsigned existingSerial = in->serial;
4111                                         unsigned newSerial = tags.serialNumber;
4112
4113                                         if(((existingSerial+1) & 3) == newSerial)
4114                                         {
4115                                                 // Use new one - destroy the exisiting one
4116                                                 yaffs_DeleteChunk(dev,in->chunkId,1);
4117                                                 in->valid = 0;
4118                                         }
4119                                         else
4120                                         {
4121                                                 // Use existing - destroy this one.
4122                                                 yaffs_DeleteChunk(dev,chunk,1);
4123                                         }
4124                                 }
4125
4126                                 if(!in->valid &&
4127                                    (tags.objectId == YAFFS_OBJECTID_ROOT ||
4128                                     tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
4129                                 {
4130                                         // We only load some info, don't fiddle with directory structure
4131                                         in->valid = 1;
4132                                         in->variantType = oh->type;
4133
4134                                         in->st_mode  = oh->st_mode;
4135 #ifdef CONFIG_YAFFS_WINCE
4136                                         in->win_atime[0] = oh->win_atime[0];
4137                                         in->win_ctime[0] = oh->win_ctime[0];
4138                                         in->win_mtime[0] = oh->win_mtime[0];
4139                                         in->win_atime[1] = oh->win_atime[1];
4140                                         in->win_ctime[1] = oh->win_ctime[1];
4141                                         in->win_mtime[1] = oh->win_mtime[1];
4142 #else
4143                                         in->st_uid   = oh->st_uid;
4144                                         in->st_gid   = oh->st_gid;
4145                                         in->st_atime = oh->st_atime;
4146                                         in->st_mtime = oh->st_mtime;
4147                                         in->st_ctime = oh->st_ctime;
4148                                         in->st_rdev = oh->st_rdev;
4149 #endif
4150                                         in->chunkId  = chunk;
4151
4152                                 }
4153                                 else if(!in->valid)
4154                                 {
4155                                         // we need to load this info
4156
4157                                         in->valid = 1;
4158                                         in->variantType = oh->type;
4159
4160                                         in->st_mode  = oh->st_mode;
4161 #ifdef CONFIG_YAFFS_WINCE
4162                                         in->win_atime[0] = oh->win_atime[0];
4163                                         in->win_ctime[0] = oh->win_ctime[0];
4164                                         in->win_mtime[0] = oh->win_mtime[0];
4165                                         in->win_atime[1] = oh->win_atime[1];
4166                                         in->win_ctime[1] = oh->win_ctime[1];
4167                                         in->win_mtime[1] = oh->win_mtime[1];
4168 #else
4169                                         in->st_uid   = oh->st_uid;
4170                                         in->st_gid   = oh->st_gid;
4171                                         in->st_atime = oh->st_atime;
4172                                         in->st_mtime = oh->st_mtime;
4173                                         in->st_ctime = oh->st_ctime;
4174                                         in->st_rdev = oh->st_rdev;
4175 #endif
4176                                         in->chunkId  = chunk;
4177
4178                                         yaffs_SetObjectName(in,oh->name);
4179                                         in->dirty = 0;
4180
4181                                         // directory stuff...
4182                                         // hook up to parent
4183
4184                                         parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY);
4185                                         if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN)
4186                                         {
4187                                                 // Set up as a directory
4188                                                 parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY;
4189                                                 INIT_LIST_HEAD(&parent->variant.directoryVariant.children);
4190                                         }
4191                                         else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
4192                                         {
4193                                                 // Hoosterman, another problem....
4194                                                 // We're trying to use a non-directory as a directory
4195                                                 // Todo ... handle
4196                                                 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: attempting to use non-directory as a directory in scan" TENDSTR)));
4197
4198                                         }
4199
4200                                         yaffs_AddObjectToDirectory(parent,in);
4201                                         if(parent == dev->unlinkedDir)
4202                                         {
4203                                                 in->deleted = 1; // If it is unlinked at start up then it wants deleting
4204                                                 dev->nDeletedFiles++;
4205                                         }
4206
4207                                         // Note re hardlinks.
4208                                         // Since we might scan a hardlink before its equivalent object is scanned
4209                                         // we put them all in a list.
4210                                         // After scanning is complete, we should have all the objects, so we run through this
4211                                         // list and fix up all the chains.
4212
4213                                         switch(in->variantType)
4214                                         {
4215                                                 case YAFFS_OBJECT_TYPE_UNKNOWN:         // Todo got a problem
4216                                                         break;
4217                                                 case YAFFS_OBJECT_TYPE_FILE:
4218 #ifdef CONFIG_YAFFS_USE_HEADER_FILE_SIZE
4219                                                         in->variant.fileVariant.fileSize = oh->fileSize;
4220 #endif
4221                                                         break;
4222                                                 case YAFFS_OBJECT_TYPE_HARDLINK:
4223                                                         in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId;
4224                                                         in->hardLinks.next = (struct list_head *)hardList;
4225                                                         hardList = in;
4226                                                         break;
4227                                                 case YAFFS_OBJECT_TYPE_DIRECTORY:       // Do nothing
4228                                                         break;
4229                                                 case YAFFS_OBJECT_TYPE_SPECIAL: // Do nothing
4230                                                         break;
4231                                                 case YAFFS_OBJECT_TYPE_SYMLINK:         // Do nothing
4232                                                         in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias);
4233                                                         break;
4234                                         }
4235                                         //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType));
4236                                 }
4237                         }
4238                 }
4239
4240                 if(state == YAFFS_BLOCK_STATE_SCANNING)
4241                 {
4242                         // If we got this far while scanning, then the block is fully allocated.
4243                         state = YAFFS_BLOCK_STATE_FULL;
4244                 }
4245
4246                 bi->blockState = state;
4247
4248                 // Now let's see if it was dirty
4249                 if(     bi->pagesInUse == 0 &&
4250                 bi->blockState == YAFFS_BLOCK_STATE_FULL)
4251             {
4252                 yaffs_BlockBecameDirty(dev,blk);
4253             }
4254
4255         }
4256
4257         // Fix up the hard link chains.
4258         // We should now have scanned all the objects, now it's time to add these
4259         // hardlinks.
4260         while(hardList)
4261         {
4262                 hl = hardList;
4263                 hardList = (yaffs_Object *)(hardList->hardLinks.next);
4264
4265                 in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId);
4266
4267                 if(in)
4268                 {
4269                         // Add the hardlink pointers
4270                         hl->variant.hardLinkVariant.equivalentObject=in;
4271                         list_add(&hl->hardLinks,&in->hardLinks);
4272                 }
4273                 else
4274                 {
4275                         //Todo Need to report/handle this better.
4276                         // Got a problem... hardlink to a non-existant object
4277                         hl->variant.hardLinkVariant.equivalentObject=NULL;
4278                         INIT_LIST_HEAD(&hl->hardLinks);
4279
4280                 }
4281
4282         }
4283
4284         {
4285                 struct list_head *i;
4286                 struct list_head *n;
4287
4288                 yaffs_Object *l;
4289                 // Soft delete all the unlinked files
4290                 list_for_each_safe(i,n,&dev->unlinkedDir->variant.directoryVariant.children)
4291                 {
4292                         if(i)
4293                         {
4294                                 l = list_entry(i, yaffs_Object,siblings);
4295                                 if(l->deleted)
4296                                 {
4297                                         yaffs_SoftDeleteFile(l);
4298                                 }
4299                         }
4300                 }
4301         }
4302
4303
4304         return YAFFS_OK;
4305 }
4306
4307
4308 ////////////////////////// Directory Functions /////////////////////////
4309
4310
4311 static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj)
4312 {
4313
4314         if(obj->siblings.prev == NULL)
4315         {
4316                 // Not initialised
4317                 INIT_LIST_HEAD(&obj->siblings);
4318
4319         }
4320         else if(!list_empty(&obj->siblings))
4321         {
4322                 // If it is holed up somewhere else, un hook it
4323                 list_del_init(&obj->siblings);
4324         }
4325         // Now add it
4326         list_add(&obj->siblings,&directory->variant.directoryVariant.children);
4327         obj->parent = directory;
4328
4329         if(directory == obj->myDev->unlinkedDir)
4330         {
4331                 obj->unlinked = 1;
4332                 obj->myDev->nUnlinkedFiles++;
4333                 obj->renameAllowed = 0;
4334         }
4335 }
4336
4337 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
4338 {
4339         list_del_init(&obj->siblings);
4340         obj->parent = NULL;
4341 }
4342
4343 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,const char *name)
4344 {
4345         int sum;
4346
4347         struct list_head *i;
4348         char buffer[YAFFS_MAX_NAME_LENGTH+1];
4349
4350         yaffs_Object *l;
4351
4352         sum = yaffs_CalcNameSum(name);
4353
4354         list_for_each(i,&directory->variant.directoryVariant.children)
4355         {
4356                 if(i)
4357                 {
4358                         l = list_entry(i, yaffs_Object,siblings);
4359
4360                         // Special case for lost-n-found
4361                         if(l->objectId == YAFFS_OBJECTID_LOSTNFOUND)
4362                         {
4363                                 if(yaffs_strcmp(name,YAFFS_LOSTNFOUND_NAME) == 0)
4364                                 {
4365                                         return l;
4366                                 }
4367                         }
4368                         else if(yaffs_SumCompare(l->sum, sum))
4369                         {
4370                                 // Do a real check
4371                                 yaffs_GetObjectName(l,buffer,YAFFS_MAX_NAME_LENGTH);
4372                                 if(yaffs_strcmp(name,buffer) == 0)
4373                                 {
4374                                         return l;
4375                                 }
4376
4377                         }
4378                 }
4379         }
4380
4381         return NULL;
4382 }
4383
4384
4385 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *))
4386 {
4387         struct list_head *i;
4388         yaffs_Object *l;
4389
4390
4391         list_for_each(i,&theDir->variant.directoryVariant.children)
4392         {
4393                 if(i)
4394                 {
4395                         l = list_entry(i, yaffs_Object,siblings);
4396                         if(l && !fn(l))
4397                         {
4398                                 return YAFFS_FAIL;
4399                         }
4400                 }
4401         }
4402
4403         return YAFFS_OK;
4404
4405 }
4406
4407
4408 // GetEquivalentObject dereferences any hard links to get to the
4409 // actual object.
4410
4411 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
4412 {
4413         if(obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4414         {
4415                 // We want the object id of the equivalent object, not this one
4416                 obj = obj->variant.hardLinkVariant.equivalentObject;
4417         }
4418         return obj;
4419
4420 }
4421
4422 int yaffs_GetObjectName(yaffs_Object *obj,char *name,int buffSize)
4423 {
4424         memset(name,0,buffSize);
4425
4426         if(obj->objectId == YAFFS_OBJECTID_LOSTNFOUND)
4427         {
4428                 strncpy(name,YAFFS_LOSTNFOUND_NAME,buffSize - 1);
4429         }
4430         else if(obj->chunkId <= 0)
4431         {
4432                 char locName[20];
4433                 // make up a name
4434                 sprintf(locName,"%s%d",YAFFS_LOSTNFOUND_PREFIX,obj->objectId);
4435                 strncpy(name,locName,buffSize - 1);
4436
4437         }
4438 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
4439         else if(obj->shortName[0])
4440         {
4441                 strcpy(name,obj->shortName);
4442         }
4443 #endif
4444         else
4445         {
4446                 __u8 buffer[YAFFS_BYTES_PER_CHUNK];
4447                 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
4448
4449                 memset(buffer,0,YAFFS_BYTES_PER_CHUNK);
4450
4451                 if(obj->chunkId >= 0)
4452                 {
4453                         yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL,1);
4454                 }
4455                 strncpy(name,oh->name,buffSize - 1);
4456         }
4457
4458         return strlen(name);
4459 }
4460
4461 int yaffs_GetObjectFileLength(yaffs_Object *obj)
4462 {
4463
4464         // Dereference any hard linking
4465         obj = yaffs_GetEquivalentObject(obj);
4466
4467         if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4468         {
4469                 return obj->variant.fileVariant.fileSize;
4470         }
4471         if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
4472         {
4473                 return strlen(obj->variant.symLinkVariant.alias);
4474         }
4475         else
4476         {
4477                 // Only a directory should drop through to here
4478                 return YAFFS_BYTES_PER_CHUNK;
4479         }
4480 }
4481
4482 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
4483 {
4484         int count = 0;
4485         struct list_head *i;
4486
4487         if(!obj->unlinked)
4488         {
4489                 count++;        // the object itself
4490         }
4491         list_for_each(i,&obj->hardLinks)
4492         {
4493                 count++;        // add the hard links;
4494         }
4495         return count;
4496
4497 }
4498
4499
4500 int yaffs_GetObjectInode(yaffs_Object *obj)
4501 {
4502         obj = yaffs_GetEquivalentObject(obj);
4503
4504         return obj->objectId;
4505 }
4506
4507 unsigned yaffs_GetObjectType(yaffs_Object *obj)
4508 {
4509         obj = yaffs_GetEquivalentObject(obj);
4510
4511         switch(obj->variantType)
4512         {
4513                 case YAFFS_OBJECT_TYPE_FILE:            return DT_REG; break;
4514                 case YAFFS_OBJECT_TYPE_DIRECTORY:       return DT_DIR; break;
4515                 case YAFFS_OBJECT_TYPE_SYMLINK:         return DT_LNK; break;
4516                 case YAFFS_OBJECT_TYPE_HARDLINK:        return DT_REG; break;
4517                 case YAFFS_OBJECT_TYPE_SPECIAL:
4518                         if(S_ISFIFO(obj->st_mode)) return DT_FIFO;
4519                         if(S_ISCHR(obj->st_mode)) return DT_CHR;
4520                         if(S_ISBLK(obj->st_mode)) return DT_BLK;
4521                         if(S_ISSOCK(obj->st_mode)) return DT_SOCK;
4522                 default: return DT_REG; break;
4523         }
4524 }
4525
4526 char *yaffs_GetSymlinkAlias(yaffs_Object *obj)
4527 {
4528         obj = yaffs_GetEquivalentObject(obj);
4529         if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
4530         {
4531                 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
4532         }
4533         else
4534         {
4535                 return yaffs_CloneString("");
4536         }
4537 }
4538
4539 #ifndef CONFIG_YAFFS_WINCE
4540
4541 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
4542 {
4543         unsigned int valid = attr->ia_valid;
4544
4545         if(valid & ATTR_MODE) obj->st_mode = attr->ia_mode;
4546         if(valid & ATTR_UID) obj->st_uid = attr->ia_uid;
4547         if(valid & ATTR_GID) obj->st_gid = attr->ia_gid;
4548
4549         if(valid & ATTR_ATIME) obj->st_atime = attr->ia_atime;
4550         if(valid & ATTR_CTIME) obj->st_ctime = attr->ia_ctime;
4551         if(valid & ATTR_MTIME) obj->st_mtime = attr->ia_mtime;
4552
4553         if(valid & ATTR_SIZE) yaffs_ResizeFile(obj,attr->ia_size);
4554
4555         yaffs_UpdateObjectHeader(obj,NULL,1);
4556
4557         return YAFFS_OK;
4558
4559 }
4560 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
4561 {
4562         unsigned int valid = 0;
4563
4564         attr->ia_mode = obj->st_mode;   valid |= ATTR_MODE;
4565         attr->ia_uid = obj->st_uid;             valid |= ATTR_UID;
4566         attr->ia_gid = obj->st_gid;             valid |= ATTR_GID;
4567
4568         attr->ia_atime = obj->st_atime; valid |= ATTR_ATIME;
4569         attr->ia_ctime = obj->st_ctime; valid |= ATTR_CTIME;
4570         attr->ia_mtime = obj->st_mtime; valid |= ATTR_MTIME;
4571
4572         attr->ia_size = yaffs_GetFileSize(obj); valid |= ATTR_SIZE;
4573
4574         attr->ia_valid = valid;
4575
4576         return YAFFS_OK;
4577
4578 }
4579
4580 #endif
4581
4582 int yaffs_DumpObject(yaffs_Object *obj)
4583 {
4584 //      __u8 buffer[YAFFS_BYTES_PER_CHUNK];
4585         char name[257];
4586 //      yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
4587
4588 //      memset(buffer,0,YAFFS_BYTES_PER_CHUNK);
4589
4590 //      if(obj->chunkId >= 0)
4591 //      {
4592 //              yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL);
4593 //      }
4594
4595         yaffs_GetObjectName(obj,name,256);
4596
4597         T(YAFFS_TRACE_ALWAYS,(TSTR("Object %d, inode %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d type %d size %d\n" TENDSTR),
4598                         obj->objectId,yaffs_GetObjectInode(obj), name, obj->dirty, obj->valid, obj->serial,
4599                         obj->sum, obj->chunkId, yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
4600
4601 #if 0
4602         YPRINTF(("Object %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d\n",
4603                         obj->objectId, oh->name, obj->dirty, obj->valid, obj->serial,
4604                         obj->sum, obj->chunkId));
4605                 switch(obj->variantType)
4606         {
4607                 case YAFFS_OBJECT_TYPE_FILE:
4608                         YPRINTF((" FILE length %d\n",obj->variant.fileVariant.fileSize));
4609                         break;
4610                 case YAFFS_OBJECT_TYPE_DIRECTORY:
4611                         YPRINTF((" DIRECTORY\n"));
4612                         break;
4613                 case YAFFS_OBJECT_TYPE_HARDLINK: //todo
4614                 case YAFFS_OBJECT_TYPE_SYMLINK:
4615                 case YAFFS_OBJECT_TYPE_UNKNOWN:
4616                 default:
4617         }
4618 #endif
4619
4620         return YAFFS_OK;
4621 }
4622
4623
4624 ///////////////////////// Initialisation code ///////////////////////////
4625
4626
4627
4628 int yaffs_GutsInitialise(yaffs_Device *dev)
4629 {
4630         unsigned x;
4631         int bits;
4632         int extraBits;
4633         int nBlocks;
4634
4635         if(     dev->nBytesPerChunk != YAFFS_BYTES_PER_CHUNK ||
4636
4637                 dev->nChunksPerBlock < 2 ||
4638                 dev->nReservedBlocks < 2 ||
4639                 dev->startBlock <= 0 ||
4640                 dev->endBlock <= 0 ||
4641                 dev->endBlock <= (dev->startBlock + dev->nReservedBlocks)
4642           )
4643         {
4644                 //these parameters must be set before stating yaffs
4645                 // Other parameters startBlock,
4646                 return YAFFS_FAIL;
4647         }
4648
4649
4650
4651         if(!yaffs_CheckStructures())
4652         {
4653                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
4654                 return YAFFS_FAIL;
4655         }
4656
4657         if(dev->isMounted)
4658         {
4659                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: device already mounted\n" TENDSTR)));
4660                 return YAFFS_FAIL;
4661         }
4662
4663         dev->isMounted = 1;
4664
4665         if(dev->startBlock <= 0 ||
4666            (dev->endBlock - dev->startBlock) < 10)
4667         {
4668                 T(YAFFS_TRACE_ALWAYS,(TSTR("startBlock %d or endBlock %d invalid\n" TENDSTR),
4669                                 dev->startBlock, dev->endBlock));
4670                 return YAFFS_FAIL;
4671         }
4672
4673         nBlocks = dev->endBlock - dev->startBlock + 1;
4674
4675
4676
4677         // OK now calculate a few things for the device
4678         // Calculate chunkGroupBits.
4679         // We need to find the next power of 2 > than endBlock
4680
4681         x = dev->nChunksPerBlock * (dev->endBlock+1);
4682
4683         for(bits = extraBits = 0; x > 1; bits++)
4684         {
4685                 if(x & 1) extraBits++;
4686                 x >>= 1;
4687         }
4688
4689         if(extraBits > 0) bits++;
4690
4691
4692         // Level0 Tnodes are 16 bits, so if the bitwidth of the
4693         // chunk range we're using is greater than 16 we need
4694         // to figure out chunk shift and chunkGroupSize
4695         if(bits <= 16)
4696         {
4697                 dev->chunkGroupBits = 0;
4698         }
4699         else
4700         {
4701                 dev->chunkGroupBits = bits - 16;
4702         }
4703         dev->chunkGroupSize = 1 << dev->chunkGroupBits;
4704
4705
4706
4707         // More device initialisation
4708         dev->garbageCollections = 0;
4709         dev->passiveGarbageCollections = 0;
4710         dev->currentDirtyChecker = 0;
4711         dev->bufferedBlock = -1;
4712         dev->doingBufferedBlockRewrite = 0;
4713         dev->nDeletedFiles = 0;
4714         dev->nBackgroundDeletions=0;
4715         dev->nUnlinkedFiles = 0;
4716         dev->eccFixed=0;
4717         dev->eccUnfixed=0;
4718         dev->tagsEccFixed=0;
4719         dev->tagsEccUnfixed=0;
4720
4721         dev->localBuffer = YMALLOC(dev->nBytesPerChunk);
4722
4723
4724
4725
4726         yaffs_InitialiseBlocks(dev,nBlocks);
4727
4728         yaffs_InitialiseTnodes(dev);
4729
4730         yaffs_InitialiseObjects(dev);
4731
4732         if(dev->nShortOpCaches > 0)
4733         {
4734                 int i;
4735
4736                 if(dev->nShortOpCaches >  YAFFS_MAX_SHORT_OP_CACHES)
4737                 {
4738                         dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
4739                 }
4740
4741                 dev->srCache = YMALLOC( dev->nShortOpCaches * sizeof(yaffs_ChunkCache));
4742
4743                 for(i=0; i < dev->nShortOpCaches; i++)
4744                 {
4745                         dev->srCache[i].object = NULL;
4746                         dev->srCache[i].lastUse = 0;
4747                         dev->srCache[i].dirty = 0;
4748                 }
4749                 dev->srLastUse = 0;
4750         }
4751
4752         dev->cacheHits = 0;
4753
4754
4755         // Initialise the unlinked, root and lost and found directories
4756         dev->lostNFoundDir = dev->rootDir = dev->unlinkedDir = NULL;
4757
4758         dev->unlinkedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_UNLINKED, S_IFDIR);
4759
4760         dev->rootDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_ROOT,YAFFS_ROOT_MODE | S_IFDIR);
4761         dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_LOSTNFOUND,YAFFS_LOSTNFOUND_MODE | S_IFDIR);
4762         yaffs_AddObjectToDirectory(dev->rootDir,dev->lostNFoundDir);
4763
4764
4765         // Now scan the flash.
4766         yaffs_Scan(dev);
4767
4768         // Zero out stats
4769         dev->nPageReads = 0;
4770     dev->nPageWrites =  0;
4771         dev->nBlockErasures = 0;
4772         dev->nGCCopies = 0;
4773         dev->nRetriedWrites = 0;
4774         dev->nRetiredBlocks = 0;
4775
4776
4777         return YAFFS_OK;
4778
4779 }
4780
4781 void yaffs_Deinitialise(yaffs_Device *dev)
4782 {
4783         if(dev->isMounted)
4784         {
4785
4786                 yaffs_DeinitialiseBlocks(dev);
4787                 yaffs_DeinitialiseTnodes(dev);
4788                 yaffs_DeinitialiseObjects(dev);
4789                 YFREE(dev->localBuffer);
4790         }
4791
4792 }
4793
4794 #if 0
4795
4796 int  yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
4797 {
4798         int nFree = dev->nFreeChunks - (dev->nChunksPerBlock * YAFFS_RESERVED_BLOCKS);
4799
4800         struct list_head *i;
4801         yaffs_Object *l;
4802
4803
4804         // To the free chunks add the chunks that are in the deleted unlinked files.
4805         list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
4806         {
4807                 l = list_entry(i, yaffs_Object,siblings);
4808                 if(l->deleted)
4809                 {
4810                         nFree++;
4811                         nFree += l->nDataChunks;
4812                 }
4813         }
4814
4815
4816         // printf("___________ nFreeChunks is %d nFree is %d\n",dev->nFreeChunks,nFree);
4817
4818         if(nFree < 0) nFree = 0;
4819
4820         return nFree;
4821
4822 }
4823
4824 #endif
4825
4826 int  yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
4827 {
4828         int nFree;
4829         int pending;
4830         int b;
4831         int nDirtyCacheChunks=0;
4832
4833         yaffs_BlockInfo *blk;
4834
4835         struct list_head *i;
4836         yaffs_Object *l;
4837
4838         for(nFree = 0, b = dev->startBlock; b <= dev->endBlock; b++)
4839         {
4840                 blk = yaffs_GetBlockInfo(dev,b);
4841
4842                 switch(blk->blockState)
4843                 {
4844                         case YAFFS_BLOCK_STATE_EMPTY:
4845                         case YAFFS_BLOCK_STATE_ALLOCATING:
4846                         case YAFFS_BLOCK_STATE_FULL: nFree += (dev->nChunksPerBlock - blk->pagesInUse); break;
4847                         default: break;
4848                 }
4849         }
4850
4851
4852         pending = 0;
4853
4854         // To the free chunks add the chunks that are in the deleted unlinked files.
4855         list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
4856         {
4857                 if(i)
4858                 {
4859                         l = list_entry(i, yaffs_Object,siblings);
4860                         if(l->deleted)
4861                         {
4862                                 pending++;
4863                                 pending += l->nDataChunks;
4864                         }
4865                 }
4866         }
4867
4868
4869
4870         //printf("___________ really free is %d, pending %d, nFree is %d\n",nFree,pending, nFree+pending);
4871
4872         if(nFree != dev->nFreeChunks)
4873         {
4874         //      printf("___________Different! really free is %d, nFreeChunks %d\n",nFree dev->nFreeChunks);
4875         }
4876
4877         nFree += pending;
4878
4879         // Now count the number of dirty chunks in the cache and subtract those
4880
4881         {
4882                 int i;
4883                 for(i = 0; i < dev->nShortOpCaches; i++)
4884                 {
4885                         if(dev->srCache[i].dirty) nDirtyCacheChunks++;
4886                 }
4887         }
4888
4889         nFree -= nDirtyCacheChunks;
4890
4891         nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
4892
4893         if(nFree < 0) nFree = 0;
4894
4895         return nFree;
4896
4897 }
4898
4899
4900
4901 /////////////////// YAFFS test code //////////////////////////////////
4902
4903 #define yaffs_CheckStruct(structure,syze, name) \
4904            if(sizeof(structure) != syze) \
4905                { \
4906                  T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),name,syze,sizeof(structure))); \
4907                  return YAFFS_FAIL; \
4908                    }
4909
4910
4911 static int yaffs_CheckStructures(void)
4912 {
4913         yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags")
4914         yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion")
4915         yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare")
4916 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
4917         yaffs_CheckStruct(yaffs_Tnode,2* YAFFS_NTNODES_LEVEL0,"yaffs_Tnode")
4918 #endif
4919         yaffs_CheckStruct(yaffs_ObjectHeader,512,"yaffs_ObjectHeader")
4920
4921
4922         return YAFFS_OK;
4923 }
4924
4925 #if 0
4926 void yaffs_GutsTest(yaffs_Device *dev)
4927 {
4928
4929         if(yaffs_CheckStructures() != YAFFS_OK)
4930         {
4931                 T(YAFFS_TRACE_ALWAYS,(TSTR("One or more structures malformed-- aborting\n" TENDSTR)));
4932                 return;
4933         }
4934
4935         yaffs_TnodeTest(dev);
4936         yaffs_ObjectTest(dev);
4937 }
4938 #endif
4939
4940
4941