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 1.44 2005-11-07 07:03:02 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->internalStartBlock || blk > dev->internalEndBlock)
 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->internalStartBlock));
 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->internalStartBlock || blk > dev->internalEndBlock)
 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->internalStartBlock];
 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->internalStartBlock * 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 - dev->chunkOffset,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 - dev->chunkOffset,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 - dev->chunkOffset));
 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 - dev->chunkOffset));
 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 - dev->chunkOffset));
 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 - dev->chunkOffset));
 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 - dev->chunkOffset,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 - dev->chunkOffset));
 290                         }
 291                         else if(nspare.eccres1<0)
 292                         {
 293                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:0" TENDSTR),chunkInNAND - dev->chunkOffset));
 294                         }
 295
 296                         if(nspare.eccres2>0)
 297                         {
 298                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error fix performed on chunk %d:1" TENDSTR),chunkInNAND - dev->chunkOffset));
 299                         }
 300                         else if(nspare.eccres2<0)
 301                         {
 302                                 T(YAFFS_TRACE_ERROR,(TSTR("**>>ecc error unfixed on chunk %d:1" TENDSTR),chunkInNAND - dev->chunkOffset));
 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 - dev->chunkOffset,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 - dev->blockOffset);
 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         yaffs_TnodeList *tmp;
 786
 787         while(dev->allocatedTnodeList)
 788         {
 789                 tmp =  dev->allocatedTnodeList->next;
 790
 791                 YFREE(dev->allocatedTnodeList->tnodes);
 792                 YFREE(dev->allocatedTnodeList);
 793                 dev->allocatedTnodeList = tmp;
 794
 795         }
 796
 797         dev->freeTnodes = NULL;
 798         dev->nFreeTnodes = 0;
 799 }
 800
 801 static void yaffs_InitialiseTnodes(yaffs_Device*dev)
 802 {
 803         dev->allocatedTnodeList = NULL;
 804         dev->freeTnodes = NULL;
 805         dev->nFreeTnodes = 0;
 806         dev->nTnodesCreated = 0;
 807
 808 }
 809
 810 #if 0
 811 void yaffs_TnodeTest(yaffs_Device *dev)
 812 {
 813
 814         int i;
 815         int j;
 816         yaffs_Tnode *tn[1000];
 817
 818         YINFO("Testing TNodes");
 819
 820         for(j = 0; j < 50; j++)
 821         {
 822                 for(i = 0; i < 1000; i++)
 823                 {
 824                         tn[i] = yaffs_GetTnode(dev);
 825                         if(!tn[i])
 826                         {
 827                                 YALERT("Getting tnode failed");
 828                         }
 829                 }
 830                 for(i = 0; i < 1000; i+=3)
 831                 {
 832                         yaffs_FreeTnode(dev,tn[i]);
 833                         tn[i] = NULL;
 834                 }
 835
 836         }
 837 }
 838 #endif
 839
 840
 841 ////////////////// END OF TNODE MANIPULATION ///////////////////////////
 842
 843 /////////////// Functions to manipulate the look-up tree (made up of tnodes)
 844 // The look up tree is represented by the top tnode and the number of topLevel
 845 // in the tree. 0 means only the level 0 tnode is in the tree.
 846
 847
 848 // FindLevel0Tnode finds the level 0 tnode, if one exists.
 849 // Used when reading.....
 850 static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,yaffs_FileStructure *fStruct, __u32 chunkId)
 851 {
 852
 853         yaffs_Tnode *tn = fStruct->top;
 854         __u32 i;
 855         int requiredTallness;
 856         int level = fStruct->topLevel;
 857
 858         // Check sane level and chunk Id
 859         if(level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
 860         {
 861 //              char str[50];
 862 //              sprintf(str,"Bad level %d",level);
 863 //              YALERT(str);
 864                 return NULL;
 865         }
 866
 867         if(chunkId > YAFFS_MAX_CHUNK_ID)
 868         {
 869 //              char str[50];
 870 //              sprintf(str,"Bad chunkId %d",chunkId);
 871 //              YALERT(str);
 872                 return NULL;
 873         }
 874
 875         // First check we're tall enough (ie enough topLevel)
 876
 877         i = chunkId >> (/*dev->chunkGroupBits  + */YAFFS_TNODES_LEVEL0_BITS);
 878         requiredTallness = 0;
 879         while(i)
 880         {
 881                 i >>= YAFFS_TNODES_INTERNAL_BITS;
 882                 requiredTallness++;
 883         }
 884
 885
 886         if(requiredTallness > fStruct->topLevel)
 887         {
 888                 // Not tall enough, so we can't find it, return NULL.
 889                 return NULL;
 890         }
 891
 892
 893         // Traverse down to level 0
 894         while (level > 0 && tn)
 895         {
 896             tn = tn->internal[(chunkId >>(/* dev->chunkGroupBits + */ YAFFS_TNODES_LEVEL0_BITS + (level-1) * YAFFS_TNODES_INTERNAL_BITS)) &
 897                                YAFFS_TNODES_INTERNAL_MASK];
 898                 level--;
 899
 900         }
 901
 902         return tn;
 903 }
 904
 905 // AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
 906 // This happens in two steps:
 907 //  1. If the tree isn't tall enough, then make it taller.
 908 //  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
 909 //
 910 // Used when modifying the tree.
 911 //
 912 static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev, yaffs_FileStructure *fStruct, __u32 chunkId)
 913 {
 914
 915         yaffs_Tnode *tn;
 916
 917         int requiredTallness;
 918         int i;
 919         int l;
 920
 921         __u32 x;
 922
 923
 924         //T((TSTR("AddOrFind topLevel=%d, chunk=%d"),fStruct->topLevel,chunkId));
 925
 926         // Check sane level and page Id
 927         if(fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
 928         {
 929 //              char str[50];
 930 //              sprintf(str,"Bad level %d",fStruct->topLevel);
 931 //              YALERT(str);
 932                 return NULL;
 933         }
 934
 935         if(chunkId > YAFFS_MAX_CHUNK_ID)
 936         {
 937 //              char str[50];
 938 //              sprintf(str,"Bad chunkId %d",chunkId);
 939 //              YALERT(str);
 940                 return NULL;
 941         }
 942
 943         // First check we're tall enough (ie enough topLevel)
 944
 945         x = chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS);
 946         requiredTallness = 0;
 947         while(x)
 948         {
 949                 x >>= YAFFS_TNODES_INTERNAL_BITS;
 950                 requiredTallness++;
 951         }
 952
 953         //T((TSTR(" required=%d"),requiredTallness));
 954
 955
 956         if(requiredTallness > fStruct->topLevel)
 957         {
 958                 // Not tall enough,gotta make the tree taller
 959                 for(i = fStruct->topLevel; i < requiredTallness; i++)
 960                 {
 961                         //T((TSTR(" add new top")));
 962
 963                         tn = yaffs_GetTnode(dev);
 964
 965                         if(tn)
 966                         {
 967                                 tn->internal[0] = fStruct->top;
 968                                 fStruct->top = tn;
 969                         }
 970                         else
 971                         {
 972                                         T(YAFFS_TRACE_ERROR,(TSTR("yaffs: no more tnodes" TENDSTR)));
 973                         }
 974                 }
 975
 976                 fStruct->topLevel = requiredTallness;
 977         }
 978
 979
 980         // Traverse down to level 0, adding anything we need
 981
 982         l = fStruct->topLevel;
 983         tn = fStruct->top;
 984         while (l > 0 && tn)
 985         {
 986                 x = (chunkId >> (/*dev->chunkGroupBits + */YAFFS_TNODES_LEVEL0_BITS + (l-1) * YAFFS_TNODES_INTERNAL_BITS)) &
 987                                YAFFS_TNODES_INTERNAL_MASK;
 988
 989                 //T((TSTR(" [%d:%d]"),l,i));
 990
 991             if(!tn->internal[x])
 992             {
 993                 //T((TSTR(" added")));
 994
 995                 tn->internal[x] = yaffs_GetTnode(dev);
 996             }
 997
 998             tn =        tn->internal[x];
 999                 l--;
1000
1001         }
1002
1003         //TSTR(TENDSTR)));
1004
1005         return tn;
1006 }
1007
1008 // DeleteWorker scans backwards through the tnode tree and deletes all the
1009 // chunks and tnodes in the file
1010 // Returns 1 if the tree was deleted. Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
1011
1012 static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset,int *limit)
1013 {
1014         int i;
1015         int chunkInInode;
1016         int theChunk;
1017         yaffs_Tags tags;
1018         int found;
1019         int chunkDeleted;
1020         int allDone = 1;
1021
1022
1023         if(tn)
1024         {
1025                 if(level > 0)
1026                 {
1027
1028                         for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--)
1029                         {
1030                             if(tn->internal[i])
1031                         {
1032                                         if(limit && (*limit) < 0)
1033                                         {
1034                                                 allDone = 0;
1035                                         }
1036                                         else
1037                                         {
1038                                                 allDone = yaffs_DeleteWorker(in,tn->internal[i],level - 1,
1039                                                                                 (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i ,limit);
1040                                         }
1041                                         if(allDone)
1042                                         {
1043                                                 yaffs_FreeTnode(in->myDev,tn->internal[i]);
1044                                         tn->internal[i] = NULL;
1045                                         }
1046                             }
1047
1048                         }
1049                         return (allDone) ? 1 : 0;
1050                 }
1051                 else if(level == 0)
1052                 {
1053                         int hitLimit = 0;
1054
1055                         for(i = YAFFS_NTNODES_LEVEL0 -1; i >= 0 && !hitLimit; i--)
1056                         {
1057                             if(tn->level0[i])
1058                         {
1059                                         int j;
1060
1061                                         chunkInInode = (chunkOffset << YAFFS_TNODES_LEVEL0_BITS ) + i;
1062
1063                                         theChunk =  tn->level0[i] << in->myDev->chunkGroupBits;
1064
1065                                         // Now we need to search for it
1066                                         for(j = 0,found = 0; theChunk && j < in->myDev->chunkGroupSize && !found; j++)
1067                                         {
1068                                                 yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,&tags,&chunkDeleted);
1069                                                 if(yaffs_TagsMatch(&tags,in->objectId,chunkInInode,chunkDeleted))
1070                                                 {
1071                                                         // found it;
1072                                                         found = 1;
1073
1074                                                 }
1075                                                 else
1076                                                 {
1077                                                         theChunk++;
1078                                                 }
1079                                         }
1080
1081                                         if(found)
1082                                         {
1083                                                 yaffs_DeleteChunk(in->myDev,theChunk,1);
1084                                                 in->nDataChunks--;
1085                                                 if(limit)
1086                                                 {
1087                                                         *limit = *limit-1;
1088                                                         if(*limit <= 0)
1089                                                         {
1090                                                                 hitLimit = 1;
1091                                                         }
1092                                                 }
1093
1094                                         }
1095
1096                                 tn->level0[i] = 0;
1097                             }
1098
1099                         }
1100                         return (i < 0) ? 1 : 0;
1101
1102
1103                 }
1104
1105         }
1106
1107         return 1;
1108
1109 }
1110
1111 // SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
1112 // All soft deleting does is increment the block's softdelete count and pulls the chunk out
1113 // of the tnode.
1114 // THus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
1115 //
1116 static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level, int chunkOffset)
1117 {
1118         int i;
1119         int chunkInInode;
1120         int theChunk;
1121         yaffs_BlockInfo *theBlock;
1122         yaffs_Tags tags;
1123         int found;
1124         int chunkDeleted;
1125         int allDone = 1;
1126
1127
1128         if(tn)
1129         {
1130                 if(level > 0)
1131                 {
1132
1133                         for(i = YAFFS_NTNODES_INTERNAL -1; allDone && i >= 0; i--)
1134                         {
1135                             if(tn->internal[i])
1136                         {
1137                                                 allDone = yaffs_SoftDeleteWorker(in,tn->internal[i],level - 1,
1138                                                                                 (chunkOffset << YAFFS_TNODES_INTERNAL_BITS ) + i);
1139                                         if(allDone)
1140                                         {
1141                                                 yaffs_FreeTnode(in->myDev,tn->internal[i]);
1142                                         tn->internal[i] = NULL;
1143                                         }
1144                                         else
1145                                         {
1146                                                 //Hoosterman... how could this happen.
1147                                         }
1148                                 }
1149                         }
1150                         return (allDone) ? 1 : 0;
1151                 }
1152                 else if(level == 0)
1153                 {
1154
1155                         for(i = YAFFS_NTNODES_LEVEL0 -1; i >=0; i--)
1156                         {
1157                             if(tn->level0[i])
1158                         {
1159                                         // Note this does not find the real chunk, only the chunk group.
1160                                         // We make an assumption that a chunk group is niot larger than a block.
1161                                         theChunk =  (tn->level0[i] << in->myDev->chunkGroupBits);
1162                                         T(YAFFS_TRACE_SCAN,(TSTR("soft delete tch %d cgb %d chunk %d" TENDSTR),
1163                                                 tn->level0[i],in->myDev->chunkGroupBits,theChunk));
1164
1165                                         theBlock =      yaffs_GetBlockInfo(in->myDev,  theChunk/in->myDev->nChunksPerBlock);
1166                                         if(theBlock)
1167                                         {
1168                                                 theBlock->softDeletions++;
1169                                         }
1170                                 tn->level0[i] = 0;
1171                             }
1172
1173                         }
1174                         return 1;
1175
1176                 }
1177
1178         }
1179
1180         return 1;
1181
1182 }
1183
1184
1185
1186 static void yaffs_SoftDeleteFile(yaffs_Object *obj)
1187 {
1188         if(obj->deleted &&
1189            obj->variantType == YAFFS_OBJECT_TYPE_FILE &&
1190            !obj->softDeleted)
1191         {
1192                 if(obj->nDataChunks <= 0)
1193                 {
1194                                 // Empty file, just delete it immediately
1195                                 yaffs_FreeTnode(obj->myDev,obj->variant.fileVariant.top);
1196                                 obj->variant.fileVariant.top = NULL;
1197                                 T(YAFFS_TRACE_TRACING,(TSTR("yaffs: Deleting empty file %d" TENDSTR),obj->objectId));
1198                                 yaffs_DoGenericObjectDeletion(obj);
1199                 }
1200                 else
1201                 {
1202                         yaffs_SoftDeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0);
1203                         obj->softDeleted = 1;
1204                 }
1205         }
1206 }
1207
1208
1209
1210
1211
1212 // Pruning removes any part of the file structure tree that is beyond the
1213 // bounds of the file (ie that does not point to chunks).
1214 //
1215 // A file should only get pruned when its size is reduced.
1216 //
1217 // Before pruning, the chunks must be pulled from the tree and the
1218 // level 0 tnode entries must be zeroed out.
1219 // Could also use this for file deletion, but that's probably better handled
1220 // by a special case.
1221
1222 // yaffs_PruneWorker should only be called by yaffs_PruneFileStructure()
1223
1224 static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn, __u32 level, int del0)
1225 {
1226         int i;
1227         int hasData;
1228
1229         if(tn)
1230         {
1231                 hasData = 0;
1232
1233                 for(i = 0; i < YAFFS_NTNODES_INTERNAL; i++)
1234                 {
1235                     if(tn->internal[i] && level > 0)
1236                     {
1237                         tn->internal[i] = yaffs_PruneWorker(dev,tn->internal[i],level - 1, ( i == 0) ? del0 : 1);
1238                     }
1239
1240                     if(tn->internal[i])
1241                     {
1242                         hasData++;
1243                         }
1244                 }
1245
1246                 if(hasData == 0 && del0)
1247                 {
1248                         // Free and return NULL
1249
1250                         yaffs_FreeTnode(dev,tn);
1251                         tn = NULL;
1252                 }
1253
1254         }
1255
1256         return tn;
1257
1258 }
1259
1260 static int yaffs_PruneFileStructure(yaffs_Device *dev, yaffs_FileStructure *fStruct)
1261 {
1262         int i;
1263         int hasData;
1264         int done = 0;
1265         yaffs_Tnode *tn;
1266
1267         if(fStruct->topLevel > 0)
1268         {
1269                 fStruct->top = yaffs_PruneWorker(dev,fStruct->top, fStruct->topLevel,0);
1270
1271                 // Now we have a tree with all the non-zero branches NULL but the height
1272                 // is the same as it was.
1273                 // Let's see if we can trim internal tnodes to shorten the tree.
1274                 // We can do this if only the 0th element in the tnode is in use
1275                 // (ie all the non-zero are NULL)
1276
1277                 while(fStruct->topLevel && !done)
1278                 {
1279                         tn = fStruct->top;
1280
1281                         hasData = 0;
1282                         for(i = 1; i <YAFFS_NTNODES_INTERNAL; i++)
1283                         {
1284                                 if(tn->internal[i])
1285                         {
1286                                 hasData++;
1287                                 }
1288                         }
1289
1290                         if(!hasData)
1291                         {
1292                                 fStruct->top = tn->internal[0];
1293                                 fStruct->topLevel--;
1294                                 yaffs_FreeTnode(dev,tn);
1295                         }
1296                         else
1297                         {
1298                                 done = 1;
1299                         }
1300                 }
1301         }
1302
1303         return YAFFS_OK;
1304 }
1305
1306
1307
1308
1309
1310 /////////////////////// End of File Structure functions. /////////////////
1311
1312 // yaffs_CreateFreeObjects creates a bunch more objects and
1313 // adds them to the object free list.
1314 static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
1315 {
1316     int i;
1317     yaffs_Object *newObjects;
1318     yaffs_ObjectList *list;
1319
1320     if(nObjects < 1) return YAFFS_OK;
1321
1322         // make these things
1323
1324     newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
1325
1326     if (!newObjects)
1327     {
1328                 T(YAFFS_TRACE_ALLOCATE,(TSTR("yaffs: Could not allocate more objects" TENDSTR)));
1329                 return YAFFS_FAIL;
1330     }
1331
1332     // Hook them into the free list
1333     for(i = 0; i < nObjects - 1; i++)
1334     {
1335         newObjects[i].siblings.next = (struct list_head *)(&newObjects[i+1]);
1336     }
1337
1338         newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
1339         dev->freeObjects = newObjects;
1340         dev->nFreeObjects+= nObjects;
1341         dev->nObjectsCreated+= nObjects;
1342
1343         // Now add this bunch of Objects to a list for freeing up.
1344
1345         list = YMALLOC(sizeof(yaffs_ObjectList));
1346         if(!list)
1347         {
1348                 T(YAFFS_TRACE_ALLOCATE,(TSTR("Could not add objects to management list" TENDSTR)));
1349         }
1350         else
1351         {
1352                 list->objects = newObjects;
1353                 list->next = dev->allocatedObjectList;
1354                 dev->allocatedObjectList = list;
1355         }
1356
1357
1358
1359         return YAFFS_OK;
1360 }
1361
1362
1363 // AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out
1364 static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
1365 {
1366         yaffs_Object *tn = NULL;
1367
1368         // If there are none left make more
1369         if(!dev->freeObjects)
1370         {
1371                 yaffs_CreateFreeObjects(dev,YAFFS_ALLOCATION_NOBJECTS);
1372         }
1373
1374         if(dev->freeObjects)
1375         {
1376                 tn = dev->freeObjects;
1377                 dev->freeObjects = (yaffs_Object *)(dev->freeObjects->siblings.next);
1378                 dev->nFreeObjects--;
1379
1380                 // Now sweeten it up...
1381
1382                 memset(tn,0,sizeof(yaffs_Object));
1383                 tn->myDev = dev;
1384                 tn->chunkId = -1;
1385                 tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
1386                 INIT_LIST_HEAD(&(tn->hardLinks));
1387                 INIT_LIST_HEAD(&(tn->hashLink));
1388                 INIT_LIST_HEAD(&tn->siblings);
1389
1390                 // Add it to the lost and found directory.
1391                 // NB Can't put root or lostNFound in lostNFound so
1392                 // check if lostNFound exists first
1393                 if(dev->lostNFoundDir)
1394                 {
1395                         yaffs_AddObjectToDirectory(dev->lostNFoundDir,tn);
1396                 }
1397         }
1398
1399
1400         return tn;
1401 }
1402
1403 static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev,int number,__u32 mode)
1404 {
1405
1406         yaffs_Object *obj = yaffs_CreateNewObject(dev,number,YAFFS_OBJECT_TYPE_DIRECTORY);
1407         if(obj)
1408         {
1409                 obj->fake = 1;                  // it is fake so it has no NAND presence...
1410                 obj->renameAllowed= 0;  // ... and we're not allowed to rename it...
1411                 obj->unlinkAllowed= 0;  // ... or unlink it
1412                 obj->deleted = 0;
1413                 obj->unlinked = 0;
1414                 obj->yst_mode = mode;
1415                 obj->myDev = dev;
1416                 obj->chunkId = 0; // Not a valid chunk.
1417         }
1418
1419         return obj;
1420
1421 }
1422
1423
1424 static void yaffs_UnhashObject(yaffs_Object *tn)
1425 {
1426         int bucket;
1427         yaffs_Device *dev = tn->myDev;
1428
1429
1430         // If it is still linked into the bucket list, free from the list
1431         if(!list_empty(&tn->hashLink))
1432         {
1433                 list_del_init(&tn->hashLink);
1434                 bucket =  yaffs_HashFunction(tn->objectId);
1435                 dev->objectBucket[bucket].count--;
1436         }
1437
1438 }
1439
1440
1441 // FreeObject frees up a Object and puts it back on the free list
1442 static void yaffs_FreeObject(yaffs_Object *tn)
1443 {
1444
1445         yaffs_Device *dev = tn->myDev;
1446
1447 #ifdef  __KERNEL__
1448         if(tn->myInode)
1449         {
1450                 // We're still hooked up to a cached inode.
1451                 // Don't delete now, but mark for later deletion
1452                 tn->deferedFree = 1;
1453                 return;
1454         }
1455 #endif
1456
1457         yaffs_UnhashObject(tn);
1458
1459         // Link into the free list.
1460         tn->siblings.next = (struct list_head *)(dev->freeObjects);
1461         dev->freeObjects = tn;
1462         dev->nFreeObjects++;
1463 }
1464
1465
1466 #ifdef __KERNEL__
1467
1468 void yaffs_HandleDeferedFree(yaffs_Object *obj)
1469 {
1470         if(obj->deferedFree)
1471         {
1472            yaffs_FreeObject(obj);
1473         }
1474 }
1475
1476 #endif
1477
1478
1479
1480 static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
1481 {
1482         // Free the list of allocated Objects
1483
1484         yaffs_ObjectList *tmp;
1485
1486         while( dev->allocatedObjectList)
1487         {
1488                 tmp =  dev->allocatedObjectList->next;
1489                 YFREE(dev->allocatedObjectList->objects);
1490                 YFREE(dev->allocatedObjectList);
1491
1492                 dev->allocatedObjectList =  tmp;
1493         }
1494
1495         dev->freeObjects = NULL;
1496         dev->nFreeObjects = 0;
1497 }
1498
1499 static void yaffs_InitialiseObjects(yaffs_Device *dev)
1500 {
1501         int i;
1502
1503         dev->allocatedObjectList = NULL;
1504         dev->freeObjects = NULL;
1505         dev->nFreeObjects = 0;
1506
1507         for(i = 0; i < YAFFS_NOBJECT_BUCKETS; i++)
1508         {
1509                 INIT_LIST_HEAD(&dev->objectBucket[i].list);
1510                 dev->objectBucket[i].count = 0;
1511         }
1512
1513 }
1514
1515
1516
1517
1518
1519
1520 int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
1521 {
1522         static int x = 0;
1523         int i;
1524         int l = 999;
1525         int lowest = 999999;
1526
1527
1528         // First let's see if we can find one that's empty.
1529
1530         for(i = 0; i < 10 && lowest > 0; i++)
1531          {
1532                 x++;
1533                 x %=  YAFFS_NOBJECT_BUCKETS;
1534                 if(dev->objectBucket[x].count < lowest)
1535                 {
1536                         lowest = dev->objectBucket[x].count;
1537                         l = x;
1538                 }
1539
1540         }
1541
1542         // If we didn't find an empty list, then try
1543         // looking a bit further for a short one
1544
1545         for(i = 0; i < 10 && lowest > 3; i++)
1546          {
1547                 x++;
1548                 x %=  YAFFS_NOBJECT_BUCKETS;
1549                 if(dev->objectBucket[x].count < lowest)
1550                 {
1551                         lowest = dev->objectBucket[x].count;
1552                         l = x;
1553                 }
1554
1555         }
1556
1557         return l;
1558 }
1559
1560 static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
1561 {
1562         int bucket = yaffs_FindNiceObjectBucket(dev);
1563
1564         // Now find an object value that has not already been taken
1565         // by scanning the list.
1566
1567         int found = 0;
1568         struct list_head *i;
1569
1570         __u32 n = (__u32)bucket;
1571
1572         //yaffs_CheckObjectHashSanity();
1573
1574         while(!found)
1575         {
1576                 found = 1;
1577                 n +=  YAFFS_NOBJECT_BUCKETS;
1578                 if(1 ||dev->objectBucket[bucket].count > 0)
1579                 {
1580                         list_for_each(i,&dev->objectBucket[bucket].list)
1581                         {
1582                                 // If there is already one in the list
1583                                 if(i && list_entry(i, yaffs_Object,hashLink)->objectId == n)
1584                                 {
1585                                         found = 0;
1586                                 }
1587                         }
1588                 }
1589         }
1590
1591         //T(("bucket %d count %d inode %d\n",bucket,yaffs_objectBucket[bucket].count,n);
1592
1593         return n;
1594 }
1595
1596 void yaffs_HashObject(yaffs_Object *in)
1597 {
1598         int bucket = yaffs_HashFunction(in->objectId);
1599         yaffs_Device *dev = in->myDev;
1600
1601         if(!list_empty(&in->hashLink))
1602         {
1603                 //YINFO("!!!");
1604         }
1605
1606
1607         list_add(&in->hashLink,&dev->objectBucket[bucket].list);
1608         dev->objectBucket[bucket].count++;
1609
1610 }
1611
1612 yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev,__u32 number)
1613 {
1614         int bucket = yaffs_HashFunction(number);
1615         struct list_head *i;
1616         yaffs_Object *in;
1617
1618         list_for_each(i,&dev->objectBucket[bucket].list)
1619         {
1620                 // Look if it is in the list
1621                 if(i)
1622                 {
1623                         in = list_entry(i, yaffs_Object,hashLink);
1624                         if(in->objectId == number)
1625                         {
1626 #ifdef __KERNEL__
1627                                 // Don't tell the VFS about this if it has been marked for freeing
1628                                 if(in->deferedFree)
1629                                     return NULL;
1630 #endif
1631                                 return in;
1632                         }
1633                 }
1634         }
1635
1636         return NULL;
1637 }
1638
1639
1640
1641 yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev,int number,yaffs_ObjectType type)
1642 {
1643
1644         yaffs_Object *theObject;
1645
1646         if(number < 0)
1647         {
1648                 number = yaffs_CreateNewObjectNumber(dev);
1649         }
1650
1651         theObject = yaffs_AllocateEmptyObject(dev);
1652
1653         if(theObject)
1654         {
1655                 theObject->fake = 0;
1656                 theObject->renameAllowed = 1;
1657                 theObject->unlinkAllowed = 1;
1658                 theObject->objectId = number;
1659                 yaffs_HashObject(theObject);
1660                 theObject->variantType = type;
1661 #ifdef CONFIG_YAFFS_WINCE
1662                 yfsd_WinFileTimeNow(theObject->win_atime);
1663                 theObject->win_ctime[0] = theObject->win_mtime[0] = theObject->win_atime[0];
1664                 theObject->win_ctime[1] = theObject->win_mtime[1] = theObject->win_atime[1];
1665
1666 #else
1667
1668                 theObject->yst_atime = theObject->yst_mtime =   theObject->yst_ctime = Y_CURRENT_TIME;
1669
1670 #endif
1671                 switch(type)
1672                 {
1673                         case YAFFS_OBJECT_TYPE_FILE:
1674                                 theObject->variant.fileVariant.fileSize = 0;
1675                                 theObject->variant.fileVariant.scannedFileSize = 0;
1676                                 theObject->variant.fileVariant.topLevel = 0;
1677                                 theObject->variant.fileVariant.top  = yaffs_GetTnode(dev);
1678                                 break;
1679                         case YAFFS_OBJECT_TYPE_DIRECTORY:
1680                                 INIT_LIST_HEAD(&theObject->variant.directoryVariant.children);
1681                                 break;
1682                         case YAFFS_OBJECT_TYPE_SYMLINK:
1683                                 // No action required
1684                                 break;
1685                         case YAFFS_OBJECT_TYPE_HARDLINK:
1686                                 // No action required
1687                                 break;
1688                         case YAFFS_OBJECT_TYPE_SPECIAL:
1689                                 // No action required
1690                                 break;
1691                         case YAFFS_OBJECT_TYPE_UNKNOWN:
1692                                 // todo this should not happen
1693                                 break;
1694                 }
1695         }
1696
1697         return theObject;
1698 }
1699
1700 yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev, int number,yaffs_ObjectType type)
1701 {
1702         yaffs_Object *theObject = NULL;
1703
1704         if(number > 0)
1705         {
1706                 theObject = yaffs_FindObjectByNumber(dev,number);
1707         }
1708
1709         if(!theObject)
1710         {
1711                 theObject = yaffs_CreateNewObject(dev,number,type);
1712         }
1713
1714         return theObject;
1715
1716 }
1717
1718 char *yaffs_CloneString(const char *str)
1719 {
1720         char *newStr = NULL;
1721
1722         if(str && *str)
1723         {
1724                 newStr = YMALLOC(strlen(str) + 1);
1725                 strcpy(newStr,str);
1726         }
1727
1728         return newStr;
1729
1730 }
1731
1732 //
1733 // Mknod (create) a new object.
1734 // equivalentObject only has meaning for a hard link;
1735 // aliasString only has meaning for a sumlink.
1736 // rdev only has meaning for devices (a subset of special objects)
1737 yaffs_Object *yaffs_MknodObject( yaffs_ObjectType type,
1738                                                                  yaffs_Object *parent,
1739                                                                  const char *name,
1740                                                                  __u32 mode,
1741                                                                  __u32 uid,
1742                                                                  __u32 gid,
1743                                                                  yaffs_Object *equivalentObject,
1744                                                                  const char *aliasString,
1745                                                                  __u32 rdev)
1746 {
1747         yaffs_Object *in;
1748
1749         yaffs_Device *dev = parent->myDev;
1750
1751         // Check if the entry exists. If it does then fail the call since we don't want a dup.
1752         if(yaffs_FindObjectByName(parent,name))
1753         {
1754                 return NULL;
1755         }
1756
1757         in = yaffs_CreateNewObject(dev,-1,type);
1758
1759         if(in)
1760         {
1761                 in->chunkId = -1;
1762                 in->valid = 1;
1763                 in->variantType = type;
1764
1765                 in->yst_mode  = mode;
1766
1767 #ifdef CONFIG_YAFFS_WINCE
1768                 yfsd_WinFileTimeNow(in->win_atime);
1769                 in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
1770                 in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
1771
1772 #else
1773
1774                 in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
1775                 in->yst_rdev  = rdev;
1776                 in->yst_uid   = uid;
1777                 in->yst_gid   = gid;
1778 #endif
1779                 in->nDataChunks = 0;
1780
1781                 yaffs_SetObjectName(in,name);
1782                 in->dirty = 1;
1783
1784                 yaffs_AddObjectToDirectory(parent,in);
1785
1786                 in->myDev = parent->myDev;
1787
1788
1789                 switch(type)
1790                 {
1791                         case YAFFS_OBJECT_TYPE_SYMLINK:
1792                                 in->variant.symLinkVariant.alias = yaffs_CloneString(aliasString);
1793                                 break;
1794                         case YAFFS_OBJECT_TYPE_HARDLINK:
1795                                 in->variant.hardLinkVariant.equivalentObject = equivalentObject;
1796                                 in->variant.hardLinkVariant.equivalentObjectId = equivalentObject->objectId;
1797                                 list_add(&in->hardLinks,&equivalentObject->hardLinks);
1798                                 break;
1799                         case YAFFS_OBJECT_TYPE_FILE: // do nothing
1800                         case YAFFS_OBJECT_TYPE_DIRECTORY: // do nothing
1801                         case YAFFS_OBJECT_TYPE_SPECIAL: // do nothing
1802                         case YAFFS_OBJECT_TYPE_UNKNOWN:
1803                                 break;
1804                 }
1805
1806                 if(/*yaffs_GetNumberOfFreeChunks(dev) <= 0 || */
1807                    yaffs_UpdateObjectHeader(in,name,0) < 0)
1808                 {
1809                         // Could not create the object header, fail the creation
1810                         yaffs_AbortHalfCreatedObject(in);
1811                         in = NULL;
1812                 }
1813
1814         }
1815
1816         return in;
1817 }
1818
1819 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid)
1820 {
1821         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE,parent,name,mode,uid,gid,NULL,NULL,0);
1822 }
1823
1824 yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid)
1825 {
1826         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY,parent,name,mode,uid,gid,NULL,NULL,0);
1827 }
1828
1829 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
1830 {
1831         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL,parent,name,mode,uid,gid,NULL,NULL,rdev);
1832 }
1833
1834 yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent,const char *name, __u32 mode, __u32 uid, __u32 gid,const char *alias)
1835 {
1836         return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK,parent,name,mode,uid,gid,NULL,alias,0);
1837 }
1838
1839 // NB yaffs_Link returns the object id of the equivalent object.
1840 yaffs_Object *yaffs_Link(yaffs_Object *parent, const char *name, yaffs_Object *equivalentObject)
1841 {
1842         // Get the real object in case we were fed a hard link as an equivalent object
1843         equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
1844
1845         if(yaffs_MknodObject(YAFFS_OBJECT_TYPE_HARDLINK,parent,name,0,0,0,equivalentObject,NULL,0))
1846         {
1847                 return equivalentObject;
1848         }
1849         else
1850         {
1851                 return NULL;
1852         }
1853
1854 }
1855
1856
1857 static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir, const char *newName,int force)
1858 {
1859         int unlinkOp;
1860
1861         if(newDir == NULL)
1862         {
1863                 newDir = obj->parent; // use the old directory
1864         }
1865
1866         unlinkOp = (newDir == obj->myDev->unlinkedDir && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
1867
1868         // If the object is a file going into the unlinked directory, then it is OK to just stuff it in since
1869         // duplicate names are allowed.
1870         // Otherwise only proceed if the new name does not exist and if we're putting it into a directory.
1871         if( (unlinkOp||
1872                  force ||
1873                  !yaffs_FindObjectByName(newDir,newName))  &&
1874              newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
1875         {
1876                 yaffs_SetObjectName(obj,newName);
1877                 obj->dirty = 1;
1878
1879                 yaffs_AddObjectToDirectory(newDir,obj);
1880
1881                 if(unlinkOp) obj->unlinked = 1;
1882
1883
1884                 if(yaffs_UpdateObjectHeader(obj,newName,0) >= 0)
1885                 {
1886                         return YAFFS_OK;
1887                 }
1888         }
1889
1890         return YAFFS_FAIL;
1891 }
1892
1893
1894
1895 int yaffs_RenameObject(yaffs_Object *oldDir, const char *oldName, yaffs_Object *newDir, const char *newName)
1896 {
1897         yaffs_Object *obj;
1898         int force = 0;
1899
1900 #ifdef CONFIG_YAFFS_CASE_INSENSITIVE
1901         // Special case for WinCE.
1902         // While look-up is case insensitive, the name isn't.
1903         // THerefore we might want to change x.txt to X.txt
1904         if(oldDir == newDir && _stricmp(oldName,newName) == 0)
1905         {
1906                 force = 1;
1907         }
1908 #endif
1909
1910         obj = yaffs_FindObjectByName(oldDir,oldName);
1911         if(obj && obj->renameAllowed)
1912         {
1913                 return yaffs_ChangeObjectName(obj,newDir,newName,force);
1914         }
1915         return YAFFS_FAIL;
1916 }
1917
1918
1919
1920 static int yaffs_CheckObjectHashSanity(yaffs_Device *dev)
1921 {
1922         // Scan the buckets and check that the lists
1923         // have as many members as the count says there are
1924         int bucket;
1925         int countEm;
1926         struct list_head *j;
1927         int ok = YAFFS_OK;
1928
1929         for(bucket = 0; bucket < YAFFS_NOBJECT_BUCKETS; bucket++)
1930         {
1931                 countEm = 0;
1932
1933                 list_for_each(j,&dev->objectBucket[bucket].list)
1934                 {
1935                         countEm++;
1936                 }
1937
1938                 if(countEm != dev->objectBucket[bucket].count)
1939                 {
1940                         T(YAFFS_TRACE_ERROR,(TSTR("Inode hash inconsistency" TENDSTR)));
1941                         ok = YAFFS_FAIL;
1942                 }
1943         }
1944
1945         return ok;
1946 }
1947
1948 #if 0
1949 void yaffs_ObjectTest(yaffs_Device *dev)
1950 {
1951         yaffs_Object *in[1000];
1952         int inNo[1000];
1953         yaffs_Object *inold[1000];
1954         int i;
1955         int j;
1956
1957         memset(in,0,1000*sizeof(yaffs_Object *));
1958         memset(inold,0,1000*sizeof(yaffs_Object *));
1959
1960         yaffs_CheckObjectHashSanity(dev);
1961
1962         for(j = 0; j < 10; j++)
1963         {
1964                 //T(("%d\n",j));
1965
1966                 for(i = 0; i < 1000; i++)
1967                 {
1968                         in[i] = yaffs_CreateNewObject(dev,-1,YAFFS_OBJECT_TYPE_FILE);
1969                         if(!in[i])
1970                         {
1971                                 YINFO("No more inodes");
1972                         }
1973                         else
1974                         {
1975                                 inNo[i] = in[i]->objectId;
1976                         }
1977                 }
1978
1979                 for(i = 0; i < 1000; i++)
1980                 {
1981                         if(yaffs_FindObjectByNumber(dev,inNo[i]) != in[i])
1982                         {
1983                                 //T(("Differnce in look up test\n"));
1984                         }
1985                         else
1986                         {
1987                                 // T(("Look up ok\n"));
1988                         }
1989                 }
1990
1991                 yaffs_CheckObjectHashSanity(dev);
1992
1993                 for(i = 0; i < 1000; i+=3)
1994                 {
1995                         yaffs_FreeObject(in[i]);
1996                         in[i] = NULL;
1997                 }
1998
1999
2000                 yaffs_CheckObjectHashSanity(dev);
2001         }
2002
2003 }
2004
2005 #endif
2006
2007 /////////////////////////// Block Management and Page Allocation ///////////////////
2008
2009
2010 static int yaffs_InitialiseBlocks(yaffs_Device *dev,int nBlocks)
2011 {
2012         dev->allocationBlock = -1; // force it to get a new one
2013         //Todo we're assuming the malloc will pass.
2014         dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
2015         // Set up dynamic blockinfo stuff.
2016         dev->chunkBitmapStride = (dev->nChunksPerBlock+7)/8;
2017         dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
2018         if(dev->blockInfo && dev->chunkBits)
2019         {
2020                 memset(dev->blockInfo,0,nBlocks * sizeof(yaffs_BlockInfo));
2021                 memset(dev->chunkBits,0,dev->chunkBitmapStride * nBlocks);
2022                 return YAFFS_OK;
2023         }
2024
2025         return YAFFS_FAIL;
2026
2027 }
2028
2029 static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
2030 {
2031         YFREE(dev->blockInfo);
2032         dev->blockInfo = NULL;
2033         YFREE(dev->chunkBits);
2034         dev->chunkBits = NULL;
2035 }
2036
2037 // FindDiretiestBlock is used to select the dirtiest block (or close enough)
2038 // for garbage collection.
2039
2040 static int yaffs_FindDirtiestBlock(yaffs_Device *dev,int aggressive)
2041 {
2042
2043         int b = dev->currentDirtyChecker;
2044
2045         int i;
2046         int iterations;
2047         int dirtiest = -1;
2048         int pagesInUse;
2049         yaffs_BlockInfo *bi;
2050
2051         // If we're doing aggressive GC then we are happy to take a less-dirty block, and
2052         // search further.
2053
2054         pagesInUse = (aggressive)? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
2055         if(aggressive)
2056         {
2057                 iterations = dev->internalEndBlock - dev->internalStartBlock + 1;
2058         }
2059         else
2060         {
2061                 iterations = dev->internalEndBlock - dev->internalStartBlock + 1;
2062                 iterations = iterations / 16;
2063                 if(iterations > 200)
2064                 {
2065                         iterations = 200;
2066                 }
2067         }
2068
2069         for(i = 0; i <= iterations && pagesInUse > 0 ; i++)
2070         {
2071                 b++;
2072                 if ( b < dev->internalStartBlock || b > dev->internalEndBlock)
2073                 {
2074                         b =  dev->internalStartBlock;
2075                 }
2076
2077                 if(b < dev->internalStartBlock || b > dev->internalEndBlock)
2078                 {
2079                         T(YAFFS_TRACE_ERROR,(TSTR("**>> Block %d is not valid" TENDSTR),b));
2080                         YBUG();
2081                 }
2082
2083                 bi = yaffs_GetBlockInfo(dev,b);
2084
2085                 if(bi->blockState == YAFFS_BLOCK_STATE_FULL &&
2086                    (bi->pagesInUse - bi->softDeletions )< pagesInUse)
2087                 {
2088                         dirtiest = b;
2089                         pagesInUse = (bi->pagesInUse - bi->softDeletions);
2090                 }
2091         }
2092
2093         dev->currentDirtyChecker = b;
2094
2095         return dirtiest;
2096 }
2097
2098
2099 static void yaffs_BlockBecameDirty(yaffs_Device *dev,int blockNo)
2100 {
2101         yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,blockNo);
2102
2103         int erasedOk = 0;
2104
2105         // If the block is still healthy erase it and mark as clean.
2106         // If the block has had a data failure, then retire it.
2107         bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
2108
2109         if(!bi->needsRetiring)
2110         {
2111                 erasedOk = yaffs_EraseBlockInNAND(dev,blockNo);
2112                 if(!erasedOk)
2113                 {
2114                         T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Erasure failed %d" TENDSTR),blockNo));
2115                 }
2116         }
2117
2118         if( erasedOk )
2119         {
2120                 // Clean it up...
2121                 bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
2122                 dev->nErasedBlocks++;
2123                 bi->pagesInUse = 0;
2124                 bi->softDeletions = 0;
2125                 yaffs_ClearChunkBits(dev,blockNo);
2126
2127                 T(YAFFS_TRACE_ERASE,(TSTR("Erased block %d" TENDSTR),blockNo));
2128         }
2129         else
2130         {
2131                 yaffs_RetireBlock(dev,blockNo);
2132                 T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,(TSTR("**>> Block %d retired" TENDSTR),blockNo));
2133         }
2134 }
2135
2136
2137 static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
2138 {
2139         int i;
2140
2141         yaffs_BlockInfo *bi;
2142
2143         if(dev->nErasedBlocks < 1)
2144         {
2145                 // Hoosterman we've got a problem.
2146                 // Can't get space to gc
2147                 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no space during gc" TENDSTR)));
2148
2149                 return -1;
2150         }
2151
2152         // Find an empty block.
2153
2154         for(i = dev->internalStartBlock; i <= dev->internalEndBlock; i++)
2155         {
2156                 dev->allocationBlockFinder++;
2157                 if(dev->allocationBlockFinder <dev->internalStartBlock || dev->allocationBlockFinder> dev->internalEndBlock)
2158                 {
2159                         dev->allocationBlockFinder = dev->internalStartBlock;
2160                 }
2161
2162                 bi = yaffs_GetBlockInfo(dev,dev->allocationBlockFinder);
2163
2164                 if(bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
2165                 {
2166                         bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
2167                         dev->nErasedBlocks--;
2168                         return dev->allocationBlockFinder;
2169                 }
2170         }
2171
2172         return -1;
2173 }
2174
2175
2176
2177 static int yaffs_AllocateChunk(yaffs_Device *dev,int useReserve)
2178 {
2179         int retVal;
2180         yaffs_BlockInfo *bi;
2181
2182         if(dev->allocationBlock < 0)
2183         {
2184                 // Get next block to allocate off
2185                 dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
2186                 dev->allocationPage = 0;
2187         }
2188
2189         if(!useReserve &&  dev->nErasedBlocks <= dev->nReservedBlocks)
2190         {
2191                 // Not enough space to allocate unless we're allowed to use the reserve.
2192                 return -1;
2193         }
2194
2195         // Next page please....
2196         if(dev->allocationBlock >= 0)
2197         {
2198                 bi = yaffs_GetBlockInfo(dev,dev->allocationBlock);
2199
2200                 retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
2201                                   dev->allocationPage;
2202                 bi->pagesInUse++;
2203                 yaffs_SetChunkBit(dev,dev->allocationBlock,dev->allocationPage);
2204
2205                 dev->allocationPage++;
2206
2207                 dev->nFreeChunks--;
2208
2209                 // If the block is full set the state to full
2210                 if(dev->allocationPage >= dev->nChunksPerBlock)
2211                 {
2212                         bi->blockState = YAFFS_BLOCK_STATE_FULL;
2213                         dev->allocationBlock = -1;
2214                 }
2215
2216
2217                 return retVal;
2218
2219         }
2220         T(YAFFS_TRACE_ERROR,(TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
2221
2222         return -1;
2223 }
2224
2225 // To determine if we have enough space we just look at the
2226 // number of erased blocks.
2227 // The cache is allowed to use reserved blocks.
2228
2229 static int yaffs_CheckSpaceForChunkCache(yaffs_Device *dev)
2230 {
2231         return (dev->nErasedBlocks >= dev->nReservedBlocks);
2232 }
2233
2234
2235 static int  yaffs_GarbageCollectBlock(yaffs_Device *dev,int block)
2236 {
2237         int oldChunk;
2238         int newChunk;
2239         int chunkInBlock;
2240         int markNAND;
2241
2242
2243         yaffs_Spare spare;
2244         yaffs_Tags  tags;
2245         __u8  buffer[YAFFS_BYTES_PER_CHUNK];
2246
2247 //      yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev,block);
2248
2249         yaffs_Object *object;
2250
2251         //T(("Collecting block %d n %d bits %x\n",block, bi->pagesInUse, bi->pageBits));
2252
2253         for(chunkInBlock = 0,oldChunk = block * dev->nChunksPerBlock;
2254             chunkInBlock < dev->nChunksPerBlock && yaffs_StillSomeChunkBits(dev,block);
2255             chunkInBlock++, oldChunk++ )
2256         {
2257                 if(yaffs_CheckChunkBit(dev,block,chunkInBlock))
2258                 {
2259
2260                         // This page is in use and might need to be copied off
2261
2262                         markNAND = 1;
2263
2264                         //T(("copying page %x from %d to %d\n",mask,oldChunk,newChunk));
2265
2266                         yaffs_ReadChunkFromNAND(dev,oldChunk,buffer, &spare,1);
2267
2268                         yaffs_GetTagsFromSpare(dev,&spare,&tags);
2269
2270                         object = yaffs_FindObjectByNumber(dev,tags.objectId);
2271
2272                         if(object && object->deleted && tags.chunkId != 0)
2273                         {
2274                                 // Data chunk in a deleted file, throw it away
2275                                 // It's a deleted data chunk,
2276                                 // No need to copy this, just forget about it and fix up the
2277                                 // object.
2278
2279                                 //yaffs_PutChunkIntoFile(object, tags.chunkId, 0,0);
2280                                 object->nDataChunks--;
2281
2282                                 if(object->nDataChunks <= 0)
2283                                 {
2284                                         // Time to delete the file too
2285                                         yaffs_FreeTnode(object->myDev,object->variant.fileVariant.top);
2286                                         object->variant.fileVariant.top = NULL;
2287                                         T(YAFFS_TRACE_TRACING,(TSTR("yaffs: About to finally delete object %d" TENDSTR),object->objectId));
2288                                         yaffs_DoGenericObjectDeletion(object);
2289                                 }
2290                                 markNAND = 0;
2291                         }
2292                         else if( 0 /* Todo object && object->deleted && object->nDataChunks == 0 */)
2293                         {
2294                                 // Deleted object header with no data chunks.
2295                                 // Can be discarded and the file deleted.
2296                                 object->chunkId = 0;
2297                                 yaffs_FreeTnode(object->myDev,object->variant.fileVariant.top);
2298                                 object->variant.fileVariant.top = NULL;
2299                                 yaffs_DoGenericObjectDeletion(object);
2300
2301                         }
2302                         else if(object)
2303                         {
2304                                 // It's either a data chunk in a live file or
2305                                 // an ObjectHeader, so we're interested in it.
2306                                 // NB Need to keep the ObjectHeaders of deleted files
2307                                 // until the whole file has been deleted off
2308                                 tags.serialNumber++;
2309                                 yaffs_LoadTagsIntoSpare(&spare,&tags);
2310
2311                                 dev->nGCCopies++;
2312
2313                                 newChunk = yaffs_WriteNewChunkToNAND(dev, buffer, &spare,1);
2314
2315                                 if(newChunk < 0)
2316                                 {
2317                                         return YAFFS_FAIL;
2318                                 }
2319
2320                                 // Ok, now fix up the Tnodes etc.
2321
2322                                 if(tags.chunkId == 0)
2323                                 {
2324                                         // It's a header
2325                                         object->chunkId = newChunk;
2326                                         object->serial = tags.serialNumber;
2327                                 }
2328                                 else
2329                                 {
2330                                         // It's a data chunk
2331                                         yaffs_PutChunkIntoFile(object, tags.chunkId, newChunk,0);
2332                                 }
2333                         }
2334
2335                         yaffs_DeleteChunk(dev,oldChunk,markNAND);
2336
2337                 }
2338         }
2339
2340         return YAFFS_OK;
2341 }
2342
2343
2344 static yaffs_Object *yaffs_FindDeletedUnlinkedFile(yaffs_Device *dev)
2345 {
2346         // find a file to delete
2347         struct list_head *i;
2348         yaffs_Object *l;
2349
2350
2351         //Scan the unlinked files looking for one to delete
2352         list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
2353         {
2354                 if(i)
2355                 {
2356                         l = list_entry(i, yaffs_Object,siblings);
2357                         if(l->deleted)
2358                         {
2359                                 return l;
2360                         }
2361                 }
2362         }
2363         return NULL;
2364 }
2365
2366
2367 static void yaffs_DoUnlinkedFileDeletion(yaffs_Device *dev)
2368 {
2369         // This does background deletion on unlinked files.. only deleted ones.
2370         // If we don't have a file we're working on then find one
2371         if(!dev->unlinkedDeletion && dev->nDeletedFiles > 0)
2372         {
2373                 dev->unlinkedDeletion = yaffs_FindDeletedUnlinkedFile(dev);
2374         }
2375
2376         // OK, we're working on a file...
2377         if(dev->unlinkedDeletion)
2378         {
2379                 yaffs_Object *obj = dev->unlinkedDeletion;
2380                 int delresult;
2381                 int limit; // Number of chunks to delete in a file.
2382                                    // NB this can be exceeded, but not by much.
2383
2384                 limit = -1;
2385
2386                 delresult = yaffs_DeleteWorker(obj, obj->variant.fileVariant.top, obj->variant.fileVariant.topLevel, 0,&limit);
2387
2388                 if(obj->nDataChunks == 0)
2389                 {
2390                         // Done all the deleting of data chunks.
2391                         // Now dump the header and clean up
2392                         yaffs_FreeTnode(dev,obj->variant.fileVariant.top);
2393                         obj->variant.fileVariant.top = NULL;
2394                         yaffs_DoGenericObjectDeletion(obj);
2395                         dev->nDeletedFiles--;
2396                         dev->nUnlinkedFiles--;
2397                         dev->nBackgroundDeletions++;
2398                         dev->unlinkedDeletion = NULL;
2399                 }
2400         }
2401 }
2402
2403
2404 #if 0
2405 #define YAFFS_GARBAGE_COLLECT_LOW_WATER 2
2406 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
2407 {
2408         int block;
2409         int aggressive=0;
2410
2411         //yaffs_DoUnlinkedFileDeletion(dev);
2412
2413         if(dev->nErasedBlocks <= (dev->nReservedBlocks + YAFFS_GARBAGE_COLLECT_LOW_WATER))
2414         {
2415                 aggressive = 1;
2416         }
2417
2418         if(aggressive)
2419         {
2420                 block = yaffs_FindDirtiestBlock(dev,aggressive);
2421
2422                 if(block >= 0)
2423                 {
2424                         dev->garbageCollections++;
2425                         return yaffs_GarbageCollectBlock(dev,block);
2426                 }
2427                 else
2428                 {
2429                         return YAFFS_FAIL;
2430                 }
2431         }
2432
2433         return YAFFS_OK;
2434 }
2435 #endif
2436
2437 // New garbage collector
2438 // If we're very low on erased blocks then we do aggressive garbage collection
2439 // otherwise we do "passive" garbage collection.
2440 // Aggressive gc looks further (whole array) and will accept dirtier blocks.
2441 // Passive gc only inspects smaller areas and will only accept cleaner blocks.
2442 //
2443 // The idea is to help clear out space in a more spread-out manner.
2444 // Dunno if it really does anything useful.
2445 //
2446 static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
2447 {
2448         int block;
2449         int aggressive=0;
2450
2451         //yaffs_DoUnlinkedFileDeletion(dev);
2452
2453         if(dev->nErasedBlocks <= (dev->nReservedBlocks + 1))
2454         {
2455                 aggressive = 1;
2456         }
2457
2458         block = yaffs_FindDirtiestBlock(dev,aggressive);
2459
2460         if(block >= 0)
2461         {
2462                 dev->garbageCollections++;
2463                 if(!aggressive)
2464                 {
2465                         dev->passiveGarbageCollections++;
2466                 }
2467
2468                 T(YAFFS_TRACE_GC,(TSTR("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),dev->nErasedBlocks,aggressive));
2469
2470                 return yaffs_GarbageCollectBlock(dev,block);
2471         }
2472
2473         return aggressive ? YAFFS_FAIL : YAFFS_OK;
2474 }
2475
2476
2477 //////////////////////////// TAGS ///////////////////////////////////////
2478
2479 static void yaffs_LoadTagsIntoSpare(yaffs_Spare *sparePtr, yaffs_Tags *tagsPtr)
2480 {
2481         yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
2482
2483         yaffs_CalcTagsECC(tagsPtr);
2484
2485         sparePtr->tagByte0 = tu->asBytes[0];
2486         sparePtr->tagByte1 = tu->asBytes[1];
2487         sparePtr->tagByte2 = tu->asBytes[2];
2488         sparePtr->tagByte3 = tu->asBytes[3];
2489         sparePtr->tagByte4 = tu->asBytes[4];
2490         sparePtr->tagByte5 = tu->asBytes[5];
2491         sparePtr->tagByte6 = tu->asBytes[6];
2492         sparePtr->tagByte7 = tu->asBytes[7];
2493 }
2494
2495 static void yaffs_GetTagsFromSpare(yaffs_Device *dev, yaffs_Spare *sparePtr,yaffs_Tags *tagsPtr)
2496 {
2497         yaffs_TagsUnion *tu = (yaffs_TagsUnion *)tagsPtr;
2498         int result;
2499
2500         tu->asBytes[0]= sparePtr->tagByte0;
2501         tu->asBytes[1]= sparePtr->tagByte1;
2502         tu->asBytes[2]= sparePtr->tagByte2;
2503         tu->asBytes[3]= sparePtr->tagByte3;
2504         tu->asBytes[4]= sparePtr->tagByte4;
2505         tu->asBytes[5]= sparePtr->tagByte5;
2506         tu->asBytes[6]= sparePtr->tagByte6;
2507         tu->asBytes[7]= sparePtr->tagByte7;
2508
2509         result =  yaffs_CheckECCOnTags(tagsPtr);
2510         if(result> 0)
2511         {
2512                 dev->tagsEccFixed++;
2513         }
2514         else if(result <0)
2515         {
2516                 dev->tagsEccUnfixed++;
2517         }
2518 }
2519
2520 static void yaffs_SpareInitialise(yaffs_Spare *spare)
2521 {
2522         memset(spare,0xFF,sizeof(yaffs_Spare));
2523 }
2524
2525 static int yaffs_ReadChunkTagsFromNAND(yaffs_Device *dev,int chunkInNAND, yaffs_Tags *tags, int *chunkDeleted)
2526 {
2527         if(tags)
2528         {
2529                 yaffs_Spare spare;
2530                 if(yaffs_ReadChunkFromNAND(dev,chunkInNAND,NULL,&spare,1) == YAFFS_OK)
2531                 {
2532                         *chunkDeleted = (yaffs_CountBits(spare.pageStatus) < 7) ? 1 : 0;
2533                         yaffs_GetTagsFromSpare(dev,&spare,tags);
2534                         return YAFFS_OK;
2535                 }
2536                 else
2537                 {
2538                         return YAFFS_FAIL;
2539                 }
2540         }
2541
2542         return YAFFS_OK;
2543 }
2544
2545 #if 0
2546 static int yaffs_WriteChunkWithTagsToNAND(yaffs_Device *dev,int chunkInNAND, const __u8 *buffer, yaffs_Tags *tags)
2547 {
2548         // NB There must be tags, data is optional
2549         // If there is data, then an ECC is calculated on it.
2550
2551         yaffs_Spare spare;
2552
2553         if(!tags)
2554         {
2555                 return YAFFS_FAIL;
2556         }
2557
2558         yaffs_SpareInitialise(&spare);
2559
2560         if(!dev->useNANDECC && buffer)
2561         {
2562                 yaffs_CalcECC(buffer,&spare);
2563         }
2564
2565         yaffs_LoadTagsIntoSpare(&spare,tags);
2566
2567         return yaffs_WriteChunkToNAND(dev,chunkInNAND,buffer,&spare);
2568
2569 }
2570 #endif
2571
2572
2573 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev, const __u8 *buffer, yaffs_Tags *tags, int useReserve)
2574 {
2575         // NB There must be tags, data is optional
2576         // If there is data, then an ECC is calculated on it.
2577
2578         yaffs_Spare spare;
2579
2580         if(!tags)
2581         {
2582                 return YAFFS_FAIL;
2583         }
2584
2585         yaffs_SpareInitialise(&spare);
2586
2587         if(!dev->useNANDECC && buffer)
2588         {
2589                 yaffs_CalcECC(buffer,&spare);
2590         }
2591
2592         yaffs_LoadTagsIntoSpare(&spare,tags);
2593
2594         return yaffs_WriteNewChunkToNAND(dev,buffer,&spare,useReserve);
2595
2596 }
2597
2598 static int yaffs_TagsMatch(const yaffs_Tags *tags, int objectId, int chunkInObject, int chunkDeleted)
2599 {
2600         return  (  tags->chunkId == chunkInObject &&
2601                            tags->objectId == objectId &&
2602                            !chunkDeleted) ? 1 : 0;
2603
2604 }
2605
2606
2607
2608 int yaffs_FindChunkInFile(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     int chunkDeleted;
2617
2618     yaffs_Device *dev = in->myDev;
2619
2620
2621     if(!tags)
2622     {
2623         // Passed a NULL, so use our own tags space
2624         tags = &localTags;
2625     }
2626
2627     tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
2628
2629     if(tn)
2630     {
2631                 theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
2632
2633                 // Now we need to do the shifting etc and search for it
2634                 for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++)
2635                 {
2636                         yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted);
2637                         if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted))
2638                         {
2639                                 // found it;
2640                                 found = 1;
2641                         }
2642                         else
2643                         {
2644                                 theChunk++;
2645                         }
2646                 }
2647     }
2648     return found ? theChunk : -1;
2649 }
2650
2651 int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in,int chunkInInode,yaffs_Tags *tags)
2652 {
2653         //Get the Tnode, then get the level 0 offset chunk offset
2654     yaffs_Tnode *tn;
2655     int theChunk = -1;
2656     yaffs_Tags localTags;
2657     int i;
2658     int found = 0;
2659     yaffs_Device *dev = in->myDev;
2660     int chunkDeleted;
2661
2662     if(!tags)
2663     {
2664         // Passed a NULL, so use our own tags space
2665         tags = &localTags;
2666     }
2667
2668     tn = yaffs_FindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
2669
2670     if(tn)
2671     {
2672
2673                 theChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] << dev->chunkGroupBits;
2674
2675                 // Now we need to do the shifting etc and search for it
2676                 for(i = 0,found = 0; theChunk && i < dev->chunkGroupSize && !found; i++)
2677                 {
2678                         yaffs_ReadChunkTagsFromNAND(dev,theChunk,tags,&chunkDeleted);
2679                         if(yaffs_TagsMatch(tags,in->objectId,chunkInInode,chunkDeleted))
2680                         {
2681                                 // found it;
2682                                 found = 1;
2683                         }
2684                         else
2685                         {
2686                                 theChunk++;
2687                         }
2688                 }
2689
2690                 // Delete the entry in the filestructure
2691                 if(found)
2692                 {
2693                         tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = 0;
2694                 }
2695     }
2696     else
2697     {
2698         //T(("No level 0 found for %d\n", chunkInInode));
2699     }
2700
2701     if(!found)
2702     {
2703         //T(("Could not find %d to delete\n",chunkInInode));
2704     }
2705     return found ? theChunk : -1;
2706 }
2707
2708
2709 #ifdef YAFFS_PARANOID
2710
2711 static int yaffs_CheckFileSanity(yaffs_Object *in)
2712 {
2713         int chunk;
2714         int nChunks;
2715         int fSize;
2716         int failed = 0;
2717         int objId;
2718         yaffs_Tnode *tn;
2719     yaffs_Tags localTags;
2720     yaffs_Tags *tags = &localTags;
2721     int theChunk;
2722     int chunkDeleted;
2723
2724
2725         if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
2726         {
2727                 //T(("Object not a file\n"));
2728                 return YAFFS_FAIL;
2729         }
2730
2731         objId = in->objectId;
2732         fSize  = in->variant.fileVariant.fileSize;
2733         nChunks = (fSize + in->myDev->nBytesPerChunk -1)/in->myDev->nBytesPerChunk;
2734
2735         for(chunk = 1; chunk <= nChunks; chunk++)
2736         {
2737                 tn = yaffs_FindLevel0Tnode(in->myDev,&in->variant.fileVariant, chunk);
2738
2739                 if(tn)
2740                 {
2741
2742                         theChunk = tn->level0[chunk & YAFFS_TNODES_LEVEL0_MASK] << in->myDev->chunkGroupBits;
2743
2744
2745                                 yaffs_ReadChunkTagsFromNAND(in->myDev,theChunk,tags,&chunkDeleted);
2746                                 if(yaffs_TagsMatch(tags,in->objectId,chunk,chunkDeleted))
2747                                 {
2748                                         // found it;
2749
2750                                 }
2751                                 else
2752                                 {
2753                                         //T(("File problem file [%d,%d] NAND %d  tags[%d,%d]\n",
2754                                         //              objId,chunk,theChunk,tags->chunkId,tags->objectId);
2755
2756                                         failed = 1;
2757
2758                                 }
2759
2760                 }
2761                 else
2762                 {
2763                         //T(("No level 0 found for %d\n", chunk));
2764                 }
2765         }
2766
2767         return failed ? YAFFS_FAIL : YAFFS_OK;
2768 }
2769
2770 #endif
2771
2772 static int yaffs_PutChunkIntoFile(yaffs_Object *in,int chunkInInode, int chunkInNAND, int inScan)
2773 {
2774         yaffs_Tnode *tn;
2775         yaffs_Device *dev = in->myDev;
2776         int existingChunk;
2777         yaffs_Tags existingTags;
2778         yaffs_Tags newTags;
2779         unsigned existingSerial, newSerial;
2780
2781         int newChunkDeleted;
2782
2783
2784         tn = yaffs_AddOrFindLevel0Tnode(dev,&in->variant.fileVariant, chunkInInode);
2785         if(!tn)
2786         {
2787                 return YAFFS_FAIL;
2788         }
2789
2790         existingChunk = tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK];
2791
2792         if(inScan)
2793         {
2794                 // If we're scanning then we need to test for duplicates
2795                 // NB This does not need to be efficient since it should only ever
2796                 // happen when the power fails during a write, then only one
2797                 // chunk should ever be affected.
2798
2799
2800                 if(existingChunk != 0)
2801                 {
2802                         // NB Right now existing chunk will not be real chunkId if the device >= 32MB
2803                         //    thus we have to do a FindChunkInFile to get the real chunk id.
2804                         //
2805                         // We have a duplicate now we need to decide which one to use
2806                         // To do this we get both sets of tags and compare serial numbers.
2807                         yaffs_ReadChunkTagsFromNAND(dev,chunkInNAND, &newTags,&newChunkDeleted);
2808
2809
2810                         // Do a proper find
2811                         existingChunk = yaffs_FindChunkInFile(in,chunkInInode, &existingTags);
2812
2813                         if(existingChunk <=0)
2814                         {
2815                                 //Hoosterman - how did this happen?
2816
2817                                 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: existing chunk < 0 in scan" TENDSTR)));
2818
2819                         }
2820
2821
2822                         // NB The deleted flags should be false, otherwise the chunks will
2823                         // not be loaded during a scan
2824
2825                         newSerial = newTags.serialNumber;
2826                         existingSerial = existingTags.serialNumber;
2827
2828                         if( existingChunk <= 0 ||
2829                             ((existingSerial+1) & 3) == newSerial)
2830                         {
2831                                 // Use new
2832                                 // Delete the old one and drop through to update the tnode
2833                                 yaffs_DeleteChunk(dev,existingChunk,1);
2834                         }
2835                         else
2836                         {
2837                                 // Use existing.
2838                                 // Delete the new one and return early so that the tnode isn't changed
2839                                 yaffs_DeleteChunk(dev,chunkInNAND,1);
2840                                 return YAFFS_OK;
2841                         }
2842                 }
2843
2844         }
2845
2846         if(existingChunk == 0)
2847         {
2848                 in->nDataChunks++;
2849         }
2850
2851         tn->level0[chunkInInode & YAFFS_TNODES_LEVEL0_MASK] = (chunkInNAND >> dev->chunkGroupBits);
2852
2853         return YAFFS_OK;
2854 }
2855
2856
2857
2858 int yaffs_ReadChunkDataFromObject(yaffs_Object *in,int chunkInInode, __u8 *buffer)
2859 {
2860     int chunkInNAND = yaffs_FindChunkInFile(in,chunkInInode,NULL);
2861
2862     if(chunkInNAND >= 0)
2863     {
2864                 return yaffs_ReadChunkFromNAND(in->myDev,chunkInNAND,buffer,NULL,1);
2865         }
2866         else
2867         {
2868                 memset(buffer,0,YAFFS_BYTES_PER_CHUNK);
2869                 return 0;
2870         }
2871
2872 }
2873
2874
2875 static void yaffs_DeleteChunk(yaffs_Device *dev,int chunkId,int markNAND)
2876 {
2877         int block;
2878         int page;
2879         yaffs_Spare spare;
2880         yaffs_BlockInfo *bi;
2881
2882         if(chunkId <= 0) return;
2883
2884         dev->nDeletions++;
2885         block = chunkId / dev->nChunksPerBlock;
2886         page = chunkId % dev->nChunksPerBlock;
2887
2888         if(markNAND)
2889         {
2890                 yaffs_SpareInitialise(&spare);
2891
2892 #ifdef CONFIG_MTD_NAND_VERIFY_WRITE
2893
2894                 //read data before write, to ensure correct ecc
2895                 //if we're using MTD verification under Linux
2896                 yaffs_ReadChunkFromNAND(dev,chunkId,NULL,&spare,0);
2897 #endif
2898
2899                 spare.pageStatus = 0; // To mark it as deleted.
2900
2901
2902                 yaffs_WriteChunkToNAND(dev,chunkId,NULL,&spare);
2903                 yaffs_HandleUpdateChunk(dev,chunkId,&spare);
2904         }
2905         else
2906         {
2907                         dev->nUnmarkedDeletions++;
2908         }
2909
2910         bi = yaffs_GetBlockInfo(dev,block);
2911
2912
2913         // Pull out of the management area.
2914         // If the whole block became dirty, this will kick off an erasure.
2915         if(     bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
2916             bi->blockState == YAFFS_BLOCK_STATE_FULL)
2917         {
2918                 dev->nFreeChunks++;
2919
2920                 yaffs_ClearChunkBit(dev,block,page);
2921                 bi->pagesInUse--;
2922
2923                 if(bi->pagesInUse == 0 &&
2924                bi->blockState == YAFFS_BLOCK_STATE_FULL)
2925             {
2926                 yaffs_BlockBecameDirty(dev,block);
2927             }
2928
2929         }
2930         else
2931         {
2932                 // T(("Bad news deleting chunk %d\n",chunkId));
2933         }
2934
2935 }
2936
2937
2938
2939
2940 int yaffs_WriteChunkDataToObject(yaffs_Object *in,int chunkInInode, const __u8 *buffer,int nBytes,int useReserve)
2941 {
2942         // Find old chunk Need to do this to get serial number
2943         // Write new one and patch into tree.
2944         // Invalidate old tags.
2945
2946     int prevChunkId;
2947     yaffs_Tags prevTags;
2948
2949     int newChunkId;
2950     yaffs_Tags newTags;
2951
2952     yaffs_Device *dev = in->myDev;
2953
2954         yaffs_CheckGarbageCollection(dev);
2955
2956         // Get the previous chunk at this location in the file if it exists
2957     prevChunkId  = yaffs_FindChunkInFile(in,chunkInInode,&prevTags);
2958
2959     // Set up new tags
2960         newTags.chunkId = chunkInInode;
2961         newTags.objectId = in->objectId;
2962         newTags.serialNumber = (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
2963         newTags.byteCount = nBytes;
2964         newTags.unusedStuff = 0xFFFFFFFF;
2965
2966         yaffs_CalcTagsECC(&newTags);
2967
2968         newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,buffer,&newTags,useReserve);
2969         if(newChunkId >= 0)
2970         {
2971                 yaffs_PutChunkIntoFile(in,chunkInInode,newChunkId,0);
2972
2973
2974                 if(prevChunkId >= 0)
2975                 {
2976                         yaffs_DeleteChunk(dev,prevChunkId,1);
2977
2978                 }
2979
2980                 yaffs_CheckFileSanity(in);
2981         }
2982         return newChunkId;
2983
2984
2985
2986
2987
2988 }
2989
2990
2991 // UpdateObjectHeader updates the header on NAND for an object.
2992 // If name is not NULL, then that new name is used.
2993 //
2994 int yaffs_UpdateObjectHeader(yaffs_Object *in,const char *name, int force)
2995 {
2996
2997         yaffs_Device *dev = in->myDev;
2998
2999     int prevChunkId;
3000
3001     int newChunkId;
3002     yaffs_Tags newTags;
3003     __u8 bufferNew[YAFFS_BYTES_PER_CHUNK];
3004     __u8 bufferOld[YAFFS_BYTES_PER_CHUNK];
3005
3006     yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)bufferNew;
3007     yaffs_ObjectHeader *ohOld = (yaffs_ObjectHeader *)bufferOld;
3008
3009
3010     if(!in->fake || force)
3011     {
3012
3013                 yaffs_CheckGarbageCollection(dev);
3014
3015                 memset(bufferNew,0xFF,YAFFS_BYTES_PER_CHUNK);
3016
3017                 prevChunkId = in->chunkId;
3018
3019                 if(prevChunkId >= 0)
3020                 {
3021                         yaffs_ReadChunkFromNAND(dev,prevChunkId,bufferOld,NULL,1);
3022                 }
3023
3024                 // Header data
3025                 oh->type = in->variantType;
3026
3027                 oh->yst_mode = in->yst_mode;
3028
3029 #ifdef CONFIG_YAFFS_WINCE
3030                 oh->win_atime[0] = in->win_atime[0];
3031                 oh->win_ctime[0] = in->win_ctime[0];
3032                 oh->win_mtime[0] = in->win_mtime[0];
3033                 oh->win_atime[1] = in->win_atime[1];
3034                 oh->win_ctime[1] = in->win_ctime[1];
3035                 oh->win_mtime[1] = in->win_mtime[1];
3036 #else
3037                 oh->yst_uid = in->yst_uid;
3038                 oh->yst_gid = in->yst_gid;
3039                 oh->yst_atime = in->yst_atime;
3040                 oh->yst_mtime = in->yst_mtime;
3041                 oh->yst_ctime = in->yst_ctime;
3042                 oh->yst_rdev = in->yst_rdev;
3043 #endif
3044                 if(in->parent)
3045                 {
3046                         oh->parentObjectId = in->parent->objectId;
3047                 }
3048                 else
3049                 {
3050                         oh->parentObjectId = 0;
3051                 }
3052
3053                 //oh->sum = in->sum;
3054                 if(name && *name)
3055                 {
3056                         memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1);
3057                         strncpy(oh->name,name,YAFFS_MAX_NAME_LENGTH);
3058                 }
3059                 else if(prevChunkId)
3060                 {
3061                         memcpy(oh->name, ohOld->name,YAFFS_MAX_NAME_LENGTH + 1);
3062                 }
3063                 else
3064                 {
3065                         memset(oh->name,0,YAFFS_MAX_NAME_LENGTH + 1);
3066                 }
3067
3068                 switch(in->variantType)
3069                 {
3070                         case YAFFS_OBJECT_TYPE_UNKNOWN:
3071                                 // Should not happen
3072                                 break;
3073                         case YAFFS_OBJECT_TYPE_FILE:
3074                                 oh->fileSize = in->variant.fileVariant.fileSize;
3075                                 break;
3076                         case YAFFS_OBJECT_TYPE_HARDLINK:
3077                                 oh->equivalentObjectId = in->variant.hardLinkVariant.equivalentObjectId;
3078                                 break;
3079                         case YAFFS_OBJECT_TYPE_SPECIAL:
3080                                 // Do nothing
3081                                 break;
3082                         case YAFFS_OBJECT_TYPE_DIRECTORY:
3083                                 // Do nothing
3084                                 break;
3085                         case YAFFS_OBJECT_TYPE_SYMLINK:
3086                                 strncpy(oh->alias,in->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
3087                                 oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
3088                                 break;
3089                 }
3090
3091                 // Tags
3092                 in->serial++;
3093                 newTags.chunkId = 0;
3094                 newTags.objectId = in->objectId;
3095                 newTags.serialNumber = in->serial;
3096                 newTags.byteCount =   0xFFFFFFFF;
3097                 newTags.unusedStuff = 0xFFFFFFFF;
3098
3099                 yaffs_CalcTagsECC(&newTags);
3100
3101
3102                 // Create new chunk in NAND
3103                 newChunkId = yaffs_WriteNewChunkWithTagsToNAND(dev,bufferNew,&newTags, (prevChunkId >= 0) ? 1 : 0 );
3104
3105                 if(newChunkId >= 0)
3106                 {
3107
3108                         in->chunkId = newChunkId;
3109
3110                         if(prevChunkId >= 0)
3111                         {
3112                                 yaffs_DeleteChunk(dev,prevChunkId,1);
3113                         }
3114
3115                         in->dirty = 0;
3116                 }
3117
3118                 return newChunkId;
3119
3120     }
3121     return 0;
3122 }
3123
3124
3125 /////////////////////// Short Operations Cache ////////////////////////////////
3126 //      In many siturations where there is no high level buffering (eg WinCE) a lot of
3127 //      reads might be short sequential reads, and a lot of writes may be short
3128 //  sequential writes. eg. scanning/writing a jpeg file.
3129 //      In these cases, a short read/write cache can provide a huge perfomance benefit
3130 //  with dumb-as-a-rock code.
3131 //  There are a limited number (~10) of cache chunks per device so that we don't
3132 //  need a very intelligent search.
3133
3134
3135
3136
3137
3138 static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
3139 {
3140         yaffs_Device *dev = obj->myDev;
3141         int lowest;
3142         int i;
3143         yaffs_ChunkCache *cache;
3144         int chunkWritten = 0;
3145         int nBytes;
3146         int nCaches = obj->myDev->nShortOpCaches;
3147
3148         if  (nCaches > 0)
3149         {
3150                 do{
3151                         cache = NULL;
3152
3153                         // Find the dirty cache for this object with the lowest chunk id.
3154                         for(i = 0; i < nCaches; i++)
3155                         {
3156                                 if(dev->srCache[i].object == obj &&
3157                                 dev->srCache[i].dirty)
3158                                 {
3159                                         if(!cache ||  dev->srCache[i].chunkId < lowest)
3160                                         {
3161                                                 cache = &dev->srCache[i];
3162                                                 lowest = cache->chunkId;
3163                                         }
3164                                 }
3165                         }
3166
3167                         if(cache)
3168                         {
3169                                 //Write it out
3170
3171 #if 0
3172                                 nBytes = cache->object->variant.fileVariant.fileSize - ((cache->chunkId -1) * YAFFS_BYTES_PER_CHUNK);
3173
3174                                 if(nBytes > YAFFS_BYTES_PER_CHUNK)
3175                                 {
3176                                         nBytes= YAFFS_BYTES_PER_CHUNK;
3177                                 }
3178 #endif
3179                                 chunkWritten = yaffs_WriteChunkDataToObject(cache->object,
3180                                                                                                                         cache->chunkId,
3181                                                                                                                         cache->data,
3182                                                                                                                         cache->nBytes,1);
3183
3184                                 cache->dirty = 0;
3185                                 cache->object = NULL;
3186                         }
3187
3188                 } while(cache && chunkWritten > 0);
3189
3190                 if(cache)
3191                 {
3192                         //Hoosterman, disk full while writing cache out.
3193                         T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
3194
3195                 }
3196         }
3197
3198 }
3199
3200
3201 // Grab us a chunk for use.
3202 // First look for an empty one.
3203 // Then look for the least recently used non-dirty one.
3204 // Then look for the least recently used dirty one...., flush and look again.
3205 static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
3206 {
3207         int i;
3208         int usage;
3209         int theOne;
3210
3211         if(dev->nShortOpCaches > 0)
3212         {
3213                 for(i = 0; i < dev->nShortOpCaches; i++)
3214                 {
3215                         if(!dev->srCache[i].object)
3216                         {
3217                                 //T(("Grabbing empty %d\n",i));
3218
3219                                 //printf("Grabbing empty %d\n",i);
3220
3221                                 return &dev->srCache[i];
3222                         }
3223                 }
3224
3225                 return NULL;
3226
3227                 theOne = -1;
3228                 usage = 0; // just to stop the compiler grizzling
3229
3230                 for(i = 0; i < dev->nShortOpCaches; i++)
3231                 {
3232                         if(!dev->srCache[i].dirty &&
3233                         ((dev->srCache[i].lastUse < usage  && theOne >= 0)||
3234                                 theOne < 0))
3235                         {
3236                                 usage = dev->srCache[i].lastUse;
3237                                 theOne = i;
3238                         }
3239                 }
3240
3241                 //T(("Grabbing non-empty %d\n",theOne));
3242
3243                 //if(theOne >= 0) printf("Grabbed non-empty cache %d\n",theOne);
3244
3245                 return  theOne >= 0 ?  &dev->srCache[theOne] : NULL;
3246         }
3247         else
3248         {
3249                 return NULL;
3250         }
3251
3252 }
3253
3254
3255 static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
3256 {
3257         yaffs_ChunkCache *cache;
3258         yaffs_Object *theObj;
3259         int usage;
3260         int i;
3261         int pushout;
3262
3263         if(dev->nShortOpCaches > 0)
3264         {
3265                 // Try find a non-dirty one...
3266
3267                 cache = yaffs_GrabChunkCacheWorker(dev);
3268
3269                 if(!cache)
3270                 {
3271                         // They were all dirty, find the last recently used object and flush
3272                         // its cache, then  find again.
3273                         // NB what's here is not very accurate, we actually flush the object
3274                         // the last recently used page.
3275
3276                         theObj = dev->srCache[0].object;
3277                         usage = dev->srCache[0].lastUse;
3278                         cache = &dev->srCache[0];
3279                         pushout = 0;
3280
3281                         for(i = 1; i < dev->nShortOpCaches; i++)
3282                         {
3283                                 if( dev->srCache[i].object &&
3284                                         dev->srCache[i].lastUse < usage)
3285                                 {
3286                                         usage  = dev->srCache[i].lastUse;
3287                                         theObj = dev->srCache[i].object;
3288                                         cache = &dev->srCache[i];
3289                                         pushout = i;
3290                                 }
3291                         }
3292
3293                         if(!cache || cache->dirty)
3294                         {
3295
3296                                 //printf("Dirty ");
3297                                 yaffs_FlushFilesChunkCache(theObj);
3298
3299                                 // Try again
3300                                 cache = yaffs_GrabChunkCacheWorker(dev);
3301                         }
3302                         else
3303                         {
3304                                 //printf(" pushout %d\n",pushout);
3305                         }
3306
3307                 }
3308
3309                 return cache;
3310         }
3311         else
3312                 return NULL;
3313
3314 }
3315
3316
3317 // Find a cached chunk
3318 static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj, int chunkId)
3319 {
3320         yaffs_Device *dev = obj->myDev;
3321         int i;
3322         if(dev->nShortOpCaches > 0)
3323         {
3324                 for(i = 0; i < dev->nShortOpCaches; i++)
3325                 {
3326                         if(dev->srCache[i].object == obj &&
3327                         dev->srCache[i].chunkId == chunkId)
3328                         {
3329                                 dev->cacheHits++;
3330
3331                                 return &dev->srCache[i];
3332                         }
3333                 }
3334         }
3335         return NULL;
3336 }
3337
3338 // Mark the chunk for the least recently used algorithym
3339 static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache, int isAWrite)
3340 {
3341
3342         if(dev->nShortOpCaches > 0)
3343         {
3344                 if( dev->srLastUse < 0 ||
3345                         dev->srLastUse > 100000000)
3346                 {
3347                         // Reset the cache usages
3348                         int i;
3349                         for(i = 1; i < dev->nShortOpCaches; i++)
3350                         {
3351                                 dev->srCache[i].lastUse = 0;
3352                         }
3353                         dev->srLastUse = 0;
3354                 }
3355
3356                 dev->srLastUse++;
3357
3358                 cache->lastUse = dev->srLastUse;
3359
3360                 if(isAWrite)
3361                 {
3362                         cache->dirty = 1;
3363                 }
3364         }
3365 }
3366
3367 // Invalidate a single cache page.
3368 // Do this when a whole page gets written,
3369 // ie the short cache for this page is no longer valid.
3370 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
3371 {
3372         if(object->myDev->nShortOpCaches > 0)
3373         {
3374                 yaffs_ChunkCache *cache = yaffs_FindChunkCache(object,chunkId);
3375
3376                 if(cache)
3377                 {
3378                         cache->object = NULL;
3379                 }
3380         }
3381 }
3382
3383
3384 // Invalidate all the cache pages associated with this object
3385 // Do this whenever ther file is deleted or resized.
3386 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
3387 {
3388         int i;
3389         yaffs_Device *dev = in->myDev;
3390
3391         if(dev->nShortOpCaches > 0)
3392         {
3393                 // Now invalidate it.
3394                 for(i = 0; i < dev->nShortOpCaches; i++)
3395                 {
3396                         if(dev->srCache[i].object == in)
3397                         {
3398                                 dev->srCache[i].object = NULL;
3399                         }
3400                 }
3401         }
3402 }
3403
3404
3405
3406
3407
3408 ///////////////////////// File read/write ///////////////////////////////
3409 // Read and write have very similar structures.
3410 // In general the read/write has three parts to it
3411 // * An incomplete chunk to start with (if the read/write is not chunk-aligned)
3412 // * Some complete chunks
3413 // * An incomplete chunk to end off with
3414 //
3415 // Curve-balls: the first chunk might also be the last chunk.
3416
3417 int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 * buffer, __u32 offset, int nBytes)
3418 {
3419
3420
3421         int chunk;
3422         int start;
3423         int nToCopy;
3424         int n = nBytes;
3425         int nDone = 0;
3426         yaffs_ChunkCache *cache;
3427
3428         yaffs_Device *dev;
3429
3430         dev = in->myDev;
3431
3432         while(n > 0)
3433         {
3434                 chunk = offset / YAFFS_BYTES_PER_CHUNK + 1; // The first chunk is 1
3435                 start = offset % YAFFS_BYTES_PER_CHUNK;
3436
3437                 // OK now check for the curveball where the start and end are in
3438                 // the same chunk.
3439                 if(     (start + n) < YAFFS_BYTES_PER_CHUNK)
3440                 {
3441                         nToCopy = n;
3442                 }
3443                 else
3444                 {
3445                         nToCopy = YAFFS_BYTES_PER_CHUNK - start;
3446                 }
3447
3448                 cache = yaffs_FindChunkCache(in,chunk);
3449
3450                 // If the chunk is already in the cache or it is less than a whole chunk
3451                 // then use the cache (if there is caching)
3452                 // else bypass the cache.
3453                 if( cache || nToCopy != YAFFS_BYTES_PER_CHUNK)
3454                 {
3455                         if(dev->nShortOpCaches > 0)
3456                         {
3457
3458                                 // If we can't find the data in the cache, then load it up.
3459
3460                                 if(!cache)
3461                                 {
3462                                         cache = yaffs_GrabChunkCache(in->myDev);
3463                                         cache->object = in;
3464                                         cache->chunkId = chunk;
3465                                         cache->dirty = 0;
3466                                         yaffs_ReadChunkDataFromObject(in,chunk,cache->data);
3467                                         cache->nBytes = 0;
3468                                 }
3469
3470                                 yaffs_UseChunkCache(dev,cache,0);
3471
3472                                 memcpy(buffer,&cache->data[start],nToCopy);
3473                         }
3474                         else
3475                         {
3476                                 // Read into the local buffer then copy...
3477                                 yaffs_ReadChunkDataFromObject(in,chunk,dev->localBuffer);
3478                                 memcpy(buffer,&dev->localBuffer[start],nToCopy);
3479                         }
3480
3481                 }
3482                 else
3483                 {
3484 #ifdef CONFIG_YAFFS_WINCE
3485
3486                         // Under WinCE can't do direct transfer. Need to use a local buffer.
3487                         // This is because we otherwise screw up WinCE's memory mapper
3488                         yaffs_ReadChunkDataFromObject(in,chunk,dev->localBuffer);
3489                         memcpy(buffer,dev->localBuffer,YAFFS_BYTES_PER_CHUNK);
3490 #else
3491                         // A full chunk. Read directly into the supplied buffer.
3492                         yaffs_ReadChunkDataFromObject(in,chunk,buffer);
3493 #endif
3494                 }
3495
3496                 n -= nToCopy;
3497                 offset += nToCopy;
3498                 buffer += nToCopy;
3499                 nDone += nToCopy;
3500
3501         }
3502
3503         return nDone;
3504 }
3505
3506
3507
3508 int yaffs_WriteDataToFile(yaffs_Object *in,const __u8 * buffer, __u32 offset, int nBytes)
3509 {
3510
3511         int chunk;
3512         int start;
3513         int nToCopy;
3514         int n = nBytes;
3515         int nDone = 0;
3516         int nToWriteBack;
3517         int startOfWrite = offset;
3518         int chunkWritten = 0;
3519         int nBytesRead;
3520
3521         yaffs_Device *dev;
3522
3523         dev = in->myDev;
3524
3525
3526         while(n > 0 && chunkWritten >= 0)
3527         {
3528                 chunk = offset / YAFFS_BYTES_PER_CHUNK + 1;
3529                 start = offset % YAFFS_BYTES_PER_CHUNK;
3530
3531
3532                 // OK now check for the curveball where the start and end are in
3533                 // the same chunk.
3534
3535                 if(     (start + n) < YAFFS_BYTES_PER_CHUNK)
3536                 {
3537                         nToCopy = n;
3538
3539                         // Now folks, to calculate how many bytes to write back....
3540                         // If we're overwriting and not writing to then end of file then
3541                         // we need to write back as much as was there before.
3542
3543                         nBytesRead = in->variant.fileVariant.fileSize - ((chunk -1) * YAFFS_BYTES_PER_CHUNK);
3544
3545                         if(nBytesRead > YAFFS_BYTES_PER_CHUNK)
3546                         {
3547                                 nBytesRead = YAFFS_BYTES_PER_CHUNK;
3548                         }
3549
3550                         nToWriteBack = (nBytesRead > (start + n)) ? nBytesRead : (start +n);
3551
3552                 }
3553                 else
3554                 {
3555                         nToCopy = YAFFS_BYTES_PER_CHUNK - start;
3556                         nToWriteBack = YAFFS_BYTES_PER_CHUNK;
3557                 }
3558
3559                 if(nToCopy != YAFFS_BYTES_PER_CHUNK)
3560                 {
3561                         // An incomplete start or end chunk (or maybe both start and end chunk)
3562                         if(dev->nShortOpCaches > 0)
3563                         {
3564                                 yaffs_ChunkCache *cache;
3565                                 // If we can't find the data in the cache, then load it up.
3566                                 cache = yaffs_FindChunkCache(in,chunk);
3567                                 if(!cache && yaffs_CheckSpaceForChunkCache(in->myDev))
3568                                 {
3569                                         cache = yaffs_GrabChunkCache(in->myDev);
3570                                         cache->object = in;
3571                                         cache->chunkId = chunk;
3572                                         cache->dirty = 0;
3573                                         yaffs_ReadChunkDataFromObject(in,chunk,cache->data);
3574                                 }
3575
3576                                 if(cache)
3577                                 {
3578                                         yaffs_UseChunkCache(dev,cache,1);
3579                                         memcpy(&cache->data[start],buffer,nToCopy);
3580                                         cache->nBytes = nToWriteBack;
3581                                 }
3582                                 else
3583                                 {
3584                                         chunkWritten = -1; // fail the write
3585                                 }
3586                         }
3587                         else
3588                         {
3589                                 // An incomplete start or end chunk (or maybe both start and end chunk)
3590                                 // Read into the local buffer then copy, then copy over and write back.
3591
3592                                 yaffs_ReadChunkDataFromObject(in,chunk,dev->localBuffer);
3593
3594                                 memcpy(&dev->localBuffer[start],buffer,nToCopy);
3595
3596                                 chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,dev->localBuffer,nToWriteBack,0);
3597
3598                                 //T(("Write with readback to chunk %d %d  start %d  copied %d wrote back %d\n",chunk,chunkWritten,start, nToCopy, nToWriteBack));
3599                         }
3600
3601                 }
3602                 else
3603                 {
3604
3605 #ifdef CONFIG_YAFFS_WINCE
3606                         // Under WinCE can't do direct transfer. Need to use a local buffer.
3607                         // This is because we otherwise screw up WinCE's memory mapper
3608                         memcpy(dev->localBuffer,buffer,YAFFS_BYTES_PER_CHUNK);
3609                         chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,dev->localBuffer,YAFFS_BYTES_PER_CHUNK,0);
3610 #else
3611                         // A full chunk. Write directly from the supplied buffer.
3612                         chunkWritten = yaffs_WriteChunkDataToObject(in,chunk,buffer,YAFFS_BYTES_PER_CHUNK,0);
3613 #endif
3614                         // Since we've overwritten the cached data, we better invalidate it.
3615                         yaffs_InvalidateChunkCache(in,chunk);
3616                         //T(("Write to chunk %d %d\n",chunk,chunkWritten));
3617                 }
3618
3619                 if(chunkWritten >= 0)
3620                 {
3621                         n -= nToCopy;
3622                         offset += nToCopy;
3623                         buffer += nToCopy;
3624                         nDone += nToCopy;
3625                 }
3626
3627         }
3628
3629         // Update file object
3630
3631         if((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
3632         {
3633                 in->variant.fileVariant.fileSize = (startOfWrite + nDone);
3634         }
3635
3636         in->dirty = 1;
3637
3638         return nDone;
3639 }
3640
3641
3642 int yaffs_ResizeFile(yaffs_Object *in, int newSize)
3643 {
3644         int i;
3645         int chunkId;
3646         int oldFileSize = in->variant.fileVariant.fileSize;
3647         int sizeOfPartialChunk = newSize % YAFFS_BYTES_PER_CHUNK;
3648
3649         yaffs_Device *dev = in->myDev;
3650
3651
3652         yaffs_FlushFilesChunkCache(in);
3653         yaffs_InvalidateWholeChunkCache(in);
3654
3655         if(in->variantType != YAFFS_OBJECT_TYPE_FILE)
3656         {
3657                 return yaffs_GetFileSize(in);
3658         }
3659
3660         if(newSize < oldFileSize)
3661         {
3662
3663                 int lastDel = 1 + (oldFileSize-1)/YAFFS_BYTES_PER_CHUNK;
3664
3665                 int startDel = 1 + (newSize + YAFFS_BYTES_PER_CHUNK - 1)/
3666                                                         YAFFS_BYTES_PER_CHUNK;
3667
3668                 // Delete backwards so that we don't end up with holes if
3669                 // power is lost part-way through the operation.
3670                 for(i = lastDel; i >= startDel; i--)
3671                 {
3672                         // NB this could be optimised somewhat,
3673                         // eg. could retrieve the tags and write them without
3674                         // using yaffs_DeleteChunk
3675
3676                         chunkId = yaffs_FindAndDeleteChunkInFile(in,i,NULL);
3677                         if(chunkId < (dev->internalStartBlock * dev->nChunksPerBlock) ||
3678                            chunkId >= ((dev->internalEndBlock+1) * dev->nChunksPerBlock))
3679                         {
3680                                 //T(("Found daft chunkId %d for %d\n",chunkId,i));
3681                         }
3682                         else
3683                         {
3684                                 in->nDataChunks--;
3685                                 yaffs_DeleteChunk(dev,chunkId,1);
3686                         }
3687                 }
3688
3689
3690                 if(sizeOfPartialChunk != 0)
3691                 {
3692                         int lastChunk = 1+ newSize/YAFFS_BYTES_PER_CHUNK;
3693
3694                         // Got to read and rewrite the last chunk with its new size.
3695                         // NB Got to zero pad to nuke old data
3696                         yaffs_ReadChunkDataFromObject(in,lastChunk,dev->localBuffer);
3697                         memset(dev->localBuffer + sizeOfPartialChunk,0, YAFFS_BYTES_PER_CHUNK - sizeOfPartialChunk);
3698
3699                         yaffs_WriteChunkDataToObject(in,lastChunk,dev->localBuffer,sizeOfPartialChunk,1);
3700
3701                 }
3702
3703                 in->variant.fileVariant.fileSize = newSize;
3704
3705                 yaffs_PruneFileStructure(dev,&in->variant.fileVariant);
3706
3707                 return newSize;
3708
3709         }
3710         else
3711         {
3712                 return oldFileSize;
3713         }
3714 }
3715
3716
3717 loff_t yaffs_GetFileSize(yaffs_Object *obj)
3718 {
3719         obj = yaffs_GetEquivalentObject(obj);
3720
3721         switch(obj->variantType)
3722         {
3723                 case YAFFS_OBJECT_TYPE_FILE:
3724                         return obj->variant.fileVariant.fileSize;
3725                 case YAFFS_OBJECT_TYPE_SYMLINK:
3726                         return strlen(obj->variant.symLinkVariant.alias);
3727                 default:
3728                         return 0;
3729         }
3730 }
3731
3732
3733
3734 // yaffs_FlushFile() updates the file's
3735 // objectId in NAND
3736
3737 int yaffs_FlushFile(yaffs_Object *in, int updateTime)
3738 {
3739         int retVal;
3740         if(in->dirty)
3741         {
3742                 //T(("flushing object header\n"));
3743
3744                 yaffs_FlushFilesChunkCache(in);
3745                 if(updateTime)
3746                 {
3747 #ifdef CONFIG_YAFFS_WINCE
3748                         yfsd_WinFileTimeNow(in->win_mtime);
3749 #else
3750                         in->yst_mtime = Y_CURRENT_TIME;
3751 #endif
3752                 }
3753
3754                 retVal = (yaffs_UpdateObjectHeader(in,NULL,0) >= 0)? YAFFS_OK : YAFFS_FAIL;
3755         }
3756         else
3757         {
3758                 retVal = YAFFS_OK;
3759         }
3760
3761         return retVal;
3762
3763 }
3764
3765
3766 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
3767 {
3768
3769         // First off, invalidate the file's data in the cache, without flushing.
3770         yaffs_InvalidateWholeChunkCache(in);
3771
3772         yaffs_RemoveObjectFromDirectory(in);
3773         yaffs_DeleteChunk(in->myDev,in->chunkId,1);
3774         in->chunkId = -1;
3775 #if 0
3776 #ifdef __KERNEL__
3777         if(in->myInode)
3778         {
3779                 in->myInode->u.generic_ip = NULL;
3780                 in->myInode = NULL;
3781         }
3782 #endif
3783 #endif
3784         yaffs_FreeObject(in);
3785         return YAFFS_OK;
3786
3787 }
3788
3789 // yaffs_DeleteFile deletes the whole file data
3790 // and the inode associated with the file.
3791 // It does not delete the links associated with the file.
3792 static int yaffs_UnlinkFile(yaffs_Object *in)
3793 {
3794
3795 #ifdef CONFIG_YAFFS_DISABLE_BACKGROUND_DELETION
3796
3797         // Delete the file data & tnodes
3798
3799          yaffs_DeleteWorker(in, in->variant.fileVariant.top, in->variant.fileVariant.topLevel, 0,NULL);
3800
3801
3802         yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);
3803
3804         return  yaffs_DoGenericObjectDeletion(in);
3805 #else
3806         int retVal;
3807         int immediateDeletion=0;
3808         retVal = yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,NULL,0);
3809         if(1 || // Ignore the result of the change name. This will only fail
3810                         // if the disk was completely full (an error condition)
3811                         // We ignore the error so we can delete files to recover the disk
3812            retVal == YAFFS_OK)
3813         {
3814                 //in->unlinked = 1;
3815                 //in->myDev->nUnlinkedFiles++;
3816                 //in->renameAllowed = 0;
3817 #ifdef __KERNEL__
3818                 if(!in->myInode)
3819                 {
3820                         // Might be open at present,
3821                         // Caught by delete_inode in yaffs_fs.c
3822                         immediateDeletion = 1;
3823
3824                 }
3825 #else
3826                 if(in->inUse <= 0)
3827                 {
3828                         immediateDeletion = 1;
3829
3830                 }
3831 #endif
3832
3833                 if(immediateDeletion)
3834                 {
3835                         T(YAFFS_TRACE_TRACING,(TSTR("yaffs: immediate deletion of file %d" TENDSTR),in->objectId));
3836                         in->deleted=1;
3837                         in->myDev->nDeletedFiles++;
3838                         yaffs_SoftDeleteFile(in);
3839                 }
3840
3841         }
3842         return retVal;
3843
3844
3845 #endif
3846 }
3847
3848 int yaffs_DeleteFile(yaffs_Object *in)
3849 {
3850         int retVal = YAFFS_OK;
3851
3852         if(in->nDataChunks > 0)
3853         {
3854                 // Use soft deletion
3855                 if(!in->unlinked)
3856                 {
3857                         retVal = yaffs_UnlinkFile(in);
3858                 }
3859                 if(retVal == YAFFS_OK &&
3860                 in->unlinked &&
3861                 !in->deleted)
3862                 {
3863                         in->deleted = 1;
3864                         in->myDev->nDeletedFiles++;
3865                         yaffs_SoftDeleteFile(in);
3866                 }
3867                 return in->deleted ? YAFFS_OK : YAFFS_FAIL;
3868         }
3869         else
3870         {
3871                 // The file has no data chunks so we toss it immediately
3872                 yaffs_FreeTnode(in->myDev,in->variant.fileVariant.top);
3873                 in->variant.fileVariant.top = NULL;
3874                 yaffs_DoGenericObjectDeletion(in);
3875
3876                 return YAFFS_OK;
3877         }
3878 }
3879
3880 static int yaffs_DeleteDirectory(yaffs_Object *in)
3881 {
3882         //First check that the directory is empty.
3883         if(list_empty(&in->variant.directoryVariant.children))
3884         {
3885                 return  yaffs_DoGenericObjectDeletion(in);
3886         }
3887
3888         return YAFFS_FAIL;
3889
3890 }
3891
3892 static int yaffs_DeleteSymLink(yaffs_Object *in)
3893 {
3894         YFREE(in->variant.symLinkVariant.alias);
3895
3896         return  yaffs_DoGenericObjectDeletion(in);
3897 }
3898
3899 static int yaffs_DeleteHardLink(yaffs_Object *in)
3900 {
3901         // remove this hardlink from the list assocaited with the equivalent
3902         // object
3903         list_del(&in->hardLinks);
3904         return  yaffs_DoGenericObjectDeletion(in);
3905 }
3906
3907
3908 static void yaffs_AbortHalfCreatedObject(yaffs_Object *obj)
3909 {
3910         switch(obj->variantType)
3911         {
3912                 case YAFFS_OBJECT_TYPE_FILE: yaffs_DeleteFile(obj); break;
3913                 case YAFFS_OBJECT_TYPE_DIRECTORY: yaffs_DeleteDirectory(obj); break;
3914                 case YAFFS_OBJECT_TYPE_SYMLINK: yaffs_DeleteSymLink(obj); break;
3915                 case YAFFS_OBJECT_TYPE_HARDLINK: yaffs_DeleteHardLink(obj); break;
3916                 case YAFFS_OBJECT_TYPE_SPECIAL: yaffs_DoGenericObjectDeletion(obj); break;
3917                 case YAFFS_OBJECT_TYPE_UNKNOWN: break; // should not happen.
3918         }
3919 }
3920
3921
3922 static int yaffs_UnlinkWorker(yaffs_Object *obj)
3923 {
3924
3925
3926         if(obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
3927         {
3928                 return  yaffs_DeleteHardLink(obj);
3929         }
3930         else if(!list_empty(&obj->hardLinks))
3931         {
3932                 // Curve ball: We're unlinking an object that has a hardlink.
3933                 //
3934                 //      This problem arises because we are not strictly following
3935                 //  The Linux link/inode model.
3936                 //
3937                 // We can't really delete the object.
3938                 // Instead, we do the following:
3939                 // - Select a hardlink.
3940                 // - Unhook it from the hard links
3941                 // - Unhook it from its parent directory (so that the rename can work)
3942                 // - Rename the object to the hardlink's name.
3943                 // - Delete the hardlink
3944
3945
3946                 yaffs_Object *hl;
3947                 int retVal;
3948                 char name[YAFFS_MAX_NAME_LENGTH+1];
3949
3950                 hl = list_entry(obj->hardLinks.next,yaffs_Object,hardLinks);
3951
3952                 list_del_init(&hl->hardLinks);
3953                 list_del_init(&hl->siblings);
3954
3955                 yaffs_GetObjectName(hl,name,YAFFS_MAX_NAME_LENGTH+1);
3956
3957                 retVal = yaffs_ChangeObjectName(obj, hl->parent, name,0);
3958
3959                 if(retVal == YAFFS_OK)
3960                 {
3961                         retVal = yaffs_DoGenericObjectDeletion(hl);
3962                 }
3963                 return retVal;
3964
3965         }
3966         else
3967         {
3968                 switch(obj->variantType)
3969                 {
3970                         case YAFFS_OBJECT_TYPE_FILE:
3971                                 return yaffs_UnlinkFile(obj);
3972                                 break;
3973                         case YAFFS_OBJECT_TYPE_DIRECTORY:
3974                                 return yaffs_DeleteDirectory(obj);
3975                                 break;
3976                         case YAFFS_OBJECT_TYPE_SYMLINK:
3977                                 return yaffs_DeleteSymLink(obj);
3978                                 break;
3979                         case YAFFS_OBJECT_TYPE_SPECIAL:
3980                                 return yaffs_DoGenericObjectDeletion(obj);
3981                                 break;
3982                         case YAFFS_OBJECT_TYPE_HARDLINK:
3983                         case YAFFS_OBJECT_TYPE_UNKNOWN:
3984                         default:
3985                                 return YAFFS_FAIL;
3986                 }
3987         }
3988 }
3989
3990 int yaffs_Unlink(yaffs_Object *dir, const char *name)
3991 {
3992         yaffs_Object *obj;
3993
3994          obj = yaffs_FindObjectByName(dir,name);
3995
3996          if(obj && obj->unlinkAllowed)
3997          {
3998                 return yaffs_UnlinkWorker(obj);
3999          }
4000
4001          return YAFFS_FAIL;
4002
4003 }
4004
4005 //////////////// Initialisation Scanning /////////////////
4006
4007
4008
4009 // For now we use the SmartMedia check.
4010 // We look at the blockStatus byte in the first two chunks
4011 // These must be 0xFF to pass as OK.
4012 // todo: this function needs to be modifyable foir different NAND types
4013 // and different chunk sizes.  Suggest make this into a per-device configurable
4014 // function.
4015 static int yaffs_IsBlockBad(yaffs_Device *dev, int blk)
4016 {
4017         yaffs_Spare spare;
4018
4019         yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock,NULL,&spare,1);
4020 #if 1
4021         if(yaffs_CountBits(spare.blockStatus) < 7)
4022         {
4023                 return 1;
4024         }
4025 #else
4026         if(spare.blockStatus != 0xFF)
4027         {
4028                 return 1;
4029         }
4030 #endif
4031         yaffs_ReadChunkFromNAND(dev,blk * dev->nChunksPerBlock + 1,NULL,&spare,1);
4032
4033 #if 1
4034         if(yaffs_CountBits(spare.blockStatus) < 7)
4035         {
4036                 return 1;
4037         }
4038 #else
4039         if(spare.blockStatus != 0xFF)
4040         {
4041                 return 1;
4042         }
4043 #endif
4044
4045         return 0;
4046
4047 }
4048
4049 static int yaffs_Scan(yaffs_Device *dev)
4050 {
4051         yaffs_Spare spare;
4052         yaffs_Tags tags;
4053         int blk;
4054         int chunk;
4055         int c;
4056         int deleted;
4057         yaffs_BlockState state;
4058         yaffs_Object *hardList = NULL;
4059         yaffs_Object *hl;
4060         yaffs_BlockInfo *bi;
4061
4062
4063         yaffs_ObjectHeader *oh;
4064         yaffs_Object *in;
4065         yaffs_Object *parent;
4066
4067         __u8 chunkData[YAFFS_BYTES_PER_CHUNK];
4068
4069
4070         // Scan all the blocks...
4071
4072         for(blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++)
4073         {
4074                 deleted = 0;
4075                 bi = yaffs_GetBlockInfo(dev,blk);
4076                 yaffs_ClearChunkBits(dev,blk);
4077                 bi->pagesInUse = 0;
4078                 bi->softDeletions = 0;
4079                 state = YAFFS_BLOCK_STATE_SCANNING;
4080
4081
4082                 if(yaffs_IsBlockBad(dev,blk))
4083                 {
4084                         state = YAFFS_BLOCK_STATE_DEAD;
4085                         T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("block %d is bad" TENDSTR),blk));
4086                 }
4087
4088                 // Read each chunk in the block.
4089
4090                 for(c = 0; c < dev->nChunksPerBlock &&
4091                                    state == YAFFS_BLOCK_STATE_SCANNING; c++)
4092                 {
4093                         // Read the spare area and decide what to do
4094                         chunk = blk * dev->nChunksPerBlock + c;
4095
4096                         yaffs_ReadChunkFromNAND(dev,chunk,NULL,&spare,1);
4097
4098
4099                         // This block looks ok, now what's in this chunk?
4100                         yaffs_GetTagsFromSpare(dev,&spare,&tags);
4101
4102                         if(yaffs_CountBits(spare.pageStatus) < 6)
4103                         {
4104                                 // A deleted chunk
4105                                 deleted++;
4106                                 dev->nFreeChunks ++;
4107                                 //T((" %d %d deleted\n",blk,c));
4108                         }
4109                         else if(tags.objectId == YAFFS_UNUSED_OBJECT_ID)
4110                         {
4111                                 // An unassigned chunk in the block
4112                                 // This means that either the block is empty or
4113                                 // this is the one being allocated from
4114
4115                                 if(c == 0)
4116                                 {
4117                                         // the block is unused
4118                                         state = YAFFS_BLOCK_STATE_EMPTY;
4119                                         dev->nErasedBlocks++;
4120                                 }
4121                                 else
4122                                 {
4123                                         // this is the block being allocated from
4124                                         T(YAFFS_TRACE_SCAN,(TSTR(" Allocating from %d %d" TENDSTR),blk,c));
4125                                         state = YAFFS_BLOCK_STATE_ALLOCATING;
4126                                         dev->allocationBlock = blk;
4127                                         dev->allocationPage = c;
4128                                 }
4129
4130                                 dev->nFreeChunks += (dev->nChunksPerBlock - c);
4131                         }
4132                         else if(tags.chunkId > 0)
4133                         {
4134                                 int endpos;
4135                                 // A data chunk.
4136                                 yaffs_SetChunkBit(dev,blk,c);
4137                                 bi->pagesInUse++;
4138
4139                                 in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,YAFFS_OBJECT_TYPE_FILE);
4140                                 // PutChunkIntoFIle checks for a clash (two data chunks with
4141                                 // the same chunkId).
4142                                 yaffs_PutChunkIntoFile(in,tags.chunkId,chunk,1);
4143                                 endpos = (tags.chunkId - 1)* YAFFS_BYTES_PER_CHUNK + tags.byteCount;
4144                                 if(in->variant.fileVariant.scannedFileSize <endpos)
4145                                 {
4146                                         in->variant.fileVariant.scannedFileSize = endpos;
4147 #ifndef CONFIG_YAFFS_USE_HEADER_FILE_SIZE
4148                                                 in->variant.fileVariant.fileSize =
4149                                                         in->variant.fileVariant.scannedFileSize;
4150 #endif
4151
4152                                 }
4153                                 //T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));
4154                         }
4155                         else
4156                         {
4157                                 // chunkId == 0, so it is an ObjectHeader.
4158                                 // Thus, we read in the object header and make the object
4159                                 yaffs_SetChunkBit(dev,blk,c);
4160                                 bi->pagesInUse++;
4161
4162                                 yaffs_ReadChunkFromNAND(dev,chunk,chunkData,NULL,1);
4163
4164                                 oh = (yaffs_ObjectHeader *)chunkData;
4165
4166                                 in = yaffs_FindOrCreateObjectByNumber(dev,tags.objectId,oh->type);
4167
4168                                 if(in->valid)
4169                                 {
4170                                         // We have already filled this one. We have a duplicate and need to resolve it.
4171
4172                                         unsigned existingSerial = in->serial;
4173                                         unsigned newSerial = tags.serialNumber;
4174
4175                                         if(((existingSerial+1) & 3) == newSerial)
4176                                         {
4177                                                 // Use new one - destroy the exisiting one
4178                                                 yaffs_DeleteChunk(dev,in->chunkId,1);
4179                                                 in->valid = 0;
4180                                         }
4181                                         else
4182                                         {
4183                                                 // Use existing - destroy this one.
4184                                                 yaffs_DeleteChunk(dev,chunk,1);
4185                                         }
4186                                 }
4187
4188                                 if(!in->valid &&
4189                                    (tags.objectId == YAFFS_OBJECTID_ROOT ||
4190                                     tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))
4191                                 {
4192                                         // We only load some info, don't fiddle with directory structure
4193                                         in->valid = 1;
4194                                         in->variantType = oh->type;
4195
4196                                         in->yst_mode  = oh->yst_mode;
4197 #ifdef CONFIG_YAFFS_WINCE
4198                                         in->win_atime[0] = oh->win_atime[0];
4199                                         in->win_ctime[0] = oh->win_ctime[0];
4200                                         in->win_mtime[0] = oh->win_mtime[0];
4201                                         in->win_atime[1] = oh->win_atime[1];
4202                                         in->win_ctime[1] = oh->win_ctime[1];
4203                                         in->win_mtime[1] = oh->win_mtime[1];
4204 #else
4205                                         in->yst_uid   = oh->yst_uid;
4206                                         in->yst_gid   = oh->yst_gid;
4207                                         in->yst_atime = oh->yst_atime;
4208                                         in->yst_mtime = oh->yst_mtime;
4209                                         in->yst_ctime = oh->yst_ctime;
4210                                         in->yst_rdev = oh->yst_rdev;
4211 #endif
4212                                         in->chunkId  = chunk;
4213
4214                                 }
4215                                 else if(!in->valid)
4216                                 {
4217                                         // we need to load this info
4218
4219                                         in->valid = 1;
4220                                         in->variantType = oh->type;
4221
4222                                         in->yst_mode  = oh->yst_mode;
4223 #ifdef CONFIG_YAFFS_WINCE
4224                                         in->win_atime[0] = oh->win_atime[0];
4225                                         in->win_ctime[0] = oh->win_ctime[0];
4226                                         in->win_mtime[0] = oh->win_mtime[0];
4227                                         in->win_atime[1] = oh->win_atime[1];
4228                                         in->win_ctime[1] = oh->win_ctime[1];
4229                                         in->win_mtime[1] = oh->win_mtime[1];
4230 #else
4231                                         in->yst_uid   = oh->yst_uid;
4232                                         in->yst_gid   = oh->yst_gid;
4233                                         in->yst_atime = oh->yst_atime;
4234                                         in->yst_mtime = oh->yst_mtime;
4235                                         in->yst_ctime = oh->yst_ctime;
4236                                         in->yst_rdev = oh->yst_rdev;
4237 #endif
4238                                         in->chunkId  = chunk;
4239
4240                                         yaffs_SetObjectName(in,oh->name);
4241                                         in->dirty = 0;
4242
4243                                         // directory stuff...
4244                                         // hook up to parent
4245
4246                                         parent = yaffs_FindOrCreateObjectByNumber(dev,oh->parentObjectId,YAFFS_OBJECT_TYPE_DIRECTORY);
4247                                         if(parent->variantType == YAFFS_OBJECT_TYPE_UNKNOWN)
4248                                         {
4249                                                 // Set up as a directory
4250                                                 parent->variantType = YAFFS_OBJECT_TYPE_DIRECTORY;
4251                                                 INIT_LIST_HEAD(&parent->variant.directoryVariant.children);
4252                                         }
4253                                         else if(parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
4254                                         {
4255                                                 // Hoosterman, another problem....
4256                                                 // We're trying to use a non-directory as a directory
4257
4258                                                 T(YAFFS_TRACE_ERROR, (TSTR("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found." TENDSTR)));
4259                                                 parent = dev->lostNFoundDir;
4260
4261                                         }
4262
4263                                         yaffs_AddObjectToDirectory(parent,in);
4264                                         if(parent == dev->unlinkedDir)
4265                                         {
4266                                                 in->deleted = 1; // If it is unlinked at start up then it wants deleting
4267                                                 dev->nDeletedFiles++;
4268                                         }
4269
4270                                         // Note re hardlinks.
4271                                         // Since we might scan a hardlink before its equivalent object is scanned
4272                                         // we put them all in a list.
4273                                         // After scanning is complete, we should have all the objects, so we run through this
4274                                         // list and fix up all the chains.
4275
4276                                         switch(in->variantType)
4277                                         {
4278                                                 case YAFFS_OBJECT_TYPE_UNKNOWN:         // Todo got a problem
4279                                                         break;
4280                                                 case YAFFS_OBJECT_TYPE_FILE:
4281 #ifdef CONFIG_YAFFS_USE_HEADER_FILE_SIZE
4282                                                         in->variant.fileVariant.fileSize = oh->fileSize;
4283 #endif
4284                                                         break;
4285                                                 case YAFFS_OBJECT_TYPE_HARDLINK:
4286                                                         in->variant.hardLinkVariant.equivalentObjectId = oh->equivalentObjectId;
4287                                                         in->hardLinks.next = (struct list_head *)hardList;
4288                                                         hardList = in;
4289                                                         break;
4290                                                 case YAFFS_OBJECT_TYPE_DIRECTORY:       // Do nothing
4291                                                         break;
4292                                                 case YAFFS_OBJECT_TYPE_SPECIAL: // Do nothing
4293                                                         break;
4294                                                 case YAFFS_OBJECT_TYPE_SYMLINK:         // Do nothing
4295                                                         in->variant.symLinkVariant.alias = yaffs_CloneString(oh->alias);
4296                                                         break;
4297                                         }
4298                                         //T((" %d %d header %d \"%s\" type %d\n",blk,c,tags.objectId,oh->name,in->variantType));
4299                                 }
4300                         }
4301                 }
4302
4303                 if(state == YAFFS_BLOCK_STATE_SCANNING)
4304                 {
4305                         // If we got this far while scanning, then the block is fully allocated.
4306                         state = YAFFS_BLOCK_STATE_FULL;
4307                 }
4308
4309                 bi->blockState = state;
4310
4311                 // Now let's see if it was dirty
4312                 if(     bi->pagesInUse == 0 &&
4313                 bi->blockState == YAFFS_BLOCK_STATE_FULL)
4314             {
4315                 yaffs_BlockBecameDirty(dev,blk);
4316             }
4317
4318         }
4319
4320         // Fix up the hard link chains.
4321         // We should now have scanned all the objects, now it's time to add these
4322         // hardlinks.
4323         while(hardList)
4324         {
4325                 hl = hardList;
4326                 hardList = (yaffs_Object *)(hardList->hardLinks.next);
4327
4328                 in = yaffs_FindObjectByNumber(dev,hl->variant.hardLinkVariant.equivalentObjectId);
4329
4330                 if(in)
4331                 {
4332                         // Add the hardlink pointers
4333                         hl->variant.hardLinkVariant.equivalentObject=in;
4334                         list_add(&hl->hardLinks,&in->hardLinks);
4335                 }
4336                 else
4337                 {
4338                         //Todo Need to report/handle this better.
4339                         // Got a problem... hardlink to a non-existant object
4340                         hl->variant.hardLinkVariant.equivalentObject=NULL;
4341                         INIT_LIST_HEAD(&hl->hardLinks);
4342
4343                 }
4344
4345         }
4346
4347         {
4348                 struct list_head *i;
4349                 struct list_head *n;
4350
4351                 yaffs_Object *l;
4352                 // Soft delete all the unlinked files
4353                 list_for_each_safe(i,n,&dev->unlinkedDir->variant.directoryVariant.children)
4354                 {
4355                         if(i)
4356                         {
4357                                 l = list_entry(i, yaffs_Object,siblings);
4358                                 if(l->deleted)
4359                                 {
4360                                         yaffs_SoftDeleteFile(l);
4361                                 }
4362                         }
4363                 }
4364         }
4365
4366
4367         return YAFFS_OK;
4368 }
4369
4370
4371 ////////////////////////// Directory Functions /////////////////////////
4372
4373
4374 static void yaffs_AddObjectToDirectory(yaffs_Object *directory, yaffs_Object *obj)
4375 {
4376
4377         if(obj->siblings.prev == NULL)
4378         {
4379                 // Not initialised
4380                 INIT_LIST_HEAD(&obj->siblings);
4381
4382         }
4383         else if(!list_empty(&obj->siblings))
4384         {
4385                 // If it is holed up somewhere else, un hook it
4386                 list_del_init(&obj->siblings);
4387         }
4388         // Now add it
4389         list_add(&obj->siblings,&directory->variant.directoryVariant.children);
4390         obj->parent = directory;
4391
4392         if(directory == obj->myDev->unlinkedDir)
4393         {
4394                 obj->unlinked = 1;
4395                 obj->myDev->nUnlinkedFiles++;
4396                 obj->renameAllowed = 0;
4397         }
4398 }
4399
4400 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
4401 {
4402         list_del_init(&obj->siblings);
4403         obj->parent = NULL;
4404 }
4405
4406 yaffs_Object *yaffs_FindObjectByName(yaffs_Object *directory,const char *name)
4407 {
4408         int sum;
4409
4410         struct list_head *i;
4411         char buffer[YAFFS_MAX_NAME_LENGTH+1];
4412
4413         yaffs_Object *l;
4414
4415         sum = yaffs_CalcNameSum(name);
4416
4417         list_for_each(i,&directory->variant.directoryVariant.children)
4418         {
4419                 if(i)
4420                 {
4421                         l = list_entry(i, yaffs_Object,siblings);
4422
4423                         // Special case for lost-n-found
4424                         if(l->objectId == YAFFS_OBJECTID_LOSTNFOUND)
4425                         {
4426                                 if(yaffs_strcmp(name,YAFFS_LOSTNFOUND_NAME) == 0)
4427                                 {
4428                                         return l;
4429                                 }
4430                         }
4431                         else if(yaffs_SumCompare(l->sum, sum))
4432                         {
4433                                 // Do a real check
4434                                 yaffs_GetObjectName(l,buffer,YAFFS_MAX_NAME_LENGTH);
4435                                 if(yaffs_strcmp(name,buffer) == 0)
4436                                 {
4437                                         return l;
4438                                 }
4439
4440                         }
4441                 }
4442         }
4443
4444         return NULL;
4445 }
4446
4447
4448 int yaffs_ApplyToDirectoryChildren(yaffs_Object *theDir,int (*fn)(yaffs_Object *))
4449 {
4450         struct list_head *i;
4451         yaffs_Object *l;
4452
4453
4454         list_for_each(i,&theDir->variant.directoryVariant.children)
4455         {
4456                 if(i)
4457                 {
4458                         l = list_entry(i, yaffs_Object,siblings);
4459                         if(l && !fn(l))
4460                         {
4461                                 return YAFFS_FAIL;
4462                         }
4463                 }
4464         }
4465
4466         return YAFFS_OK;
4467
4468 }
4469
4470
4471 // GetEquivalentObject dereferences any hard links to get to the
4472 // actual object.
4473
4474 yaffs_Object *yaffs_GetEquivalentObject(yaffs_Object *obj)
4475 {
4476         if(obj && obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
4477         {
4478                 // We want the object id of the equivalent object, not this one
4479                 obj = obj->variant.hardLinkVariant.equivalentObject;
4480         }
4481         return obj;
4482
4483 }
4484
4485 int yaffs_GetObjectName(yaffs_Object *obj,char *name,int buffSize)
4486 {
4487         memset(name,0,buffSize);
4488
4489         if(obj->objectId == YAFFS_OBJECTID_LOSTNFOUND)
4490         {
4491                 strncpy(name,YAFFS_LOSTNFOUND_NAME,buffSize - 1);
4492         }
4493         else if(obj->chunkId <= 0)
4494         {
4495                 char locName[20];
4496                 // make up a name
4497                 sprintf(locName,"%s%d",YAFFS_LOSTNFOUND_PREFIX,obj->objectId);
4498                 strncpy(name,locName,buffSize - 1);
4499
4500         }
4501 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
4502         else if(obj->shortName[0])
4503         {
4504                 strcpy(name,obj->shortName);
4505         }
4506 #endif
4507         else
4508         {
4509                 __u8 buffer[YAFFS_BYTES_PER_CHUNK];
4510                 yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
4511
4512                 memset(buffer,0,YAFFS_BYTES_PER_CHUNK);
4513
4514                 if(obj->chunkId >= 0)
4515                 {
4516                         yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL,1);
4517                 }
4518                 strncpy(name,oh->name,buffSize - 1);
4519         }
4520
4521         return strlen(name);
4522 }
4523
4524 int yaffs_GetObjectFileLength(yaffs_Object *obj)
4525 {
4526
4527         // Dereference any hard linking
4528         obj = yaffs_GetEquivalentObject(obj);
4529
4530         if(obj->variantType == YAFFS_OBJECT_TYPE_FILE)
4531         {
4532                 return obj->variant.fileVariant.fileSize;
4533         }
4534         if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
4535         {
4536                 return strlen(obj->variant.symLinkVariant.alias);
4537         }
4538         else
4539         {
4540                 // Only a directory should drop through to here
4541                 return YAFFS_BYTES_PER_CHUNK;
4542         }
4543 }
4544
4545 int yaffs_GetObjectLinkCount(yaffs_Object *obj)
4546 {
4547         int count = 0;
4548         struct list_head *i;
4549
4550         if(!obj->unlinked)
4551         {
4552                 count++;        // the object itself
4553         }
4554         list_for_each(i,&obj->hardLinks)
4555         {
4556                 count++;        // add the hard links;
4557         }
4558         return count;
4559
4560 }
4561
4562
4563 int yaffs_GetObjectInode(yaffs_Object *obj)
4564 {
4565         obj = yaffs_GetEquivalentObject(obj);
4566
4567         return obj->objectId;
4568 }
4569
4570 unsigned yaffs_GetObjectType(yaffs_Object *obj)
4571 {
4572         obj = yaffs_GetEquivalentObject(obj);
4573
4574         switch(obj->variantType)
4575         {
4576                 case YAFFS_OBJECT_TYPE_FILE:            return DT_REG; break;
4577                 case YAFFS_OBJECT_TYPE_DIRECTORY:       return DT_DIR; break;
4578                 case YAFFS_OBJECT_TYPE_SYMLINK:         return DT_LNK; break;
4579                 case YAFFS_OBJECT_TYPE_HARDLINK:        return DT_REG; break;
4580                 case YAFFS_OBJECT_TYPE_SPECIAL:
4581                         if(S_ISFIFO(obj->yst_mode)) return DT_FIFO;
4582                         if(S_ISCHR(obj->yst_mode)) return DT_CHR;
4583                         if(S_ISBLK(obj->yst_mode)) return DT_BLK;
4584                         if(S_ISSOCK(obj->yst_mode)) return DT_SOCK;
4585                 default: return DT_REG; break;
4586         }
4587 }
4588
4589 char *yaffs_GetSymlinkAlias(yaffs_Object *obj)
4590 {
4591         obj = yaffs_GetEquivalentObject(obj);
4592         if(obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
4593         {
4594                 return yaffs_CloneString(obj->variant.symLinkVariant.alias);
4595         }
4596         else
4597         {
4598                 return yaffs_CloneString("");
4599         }
4600 }
4601
4602 #ifndef CONFIG_YAFFS_WINCE
4603
4604 int yaffs_SetAttributes(yaffs_Object *obj, struct iattr *attr)
4605 {
4606         unsigned int valid = attr->ia_valid;
4607
4608         if(valid & ATTR_MODE) obj->yst_mode = attr->ia_mode;
4609         if(valid & ATTR_UID) obj->yst_uid = attr->ia_uid;
4610         if(valid & ATTR_GID) obj->yst_gid = attr->ia_gid;
4611
4612         if(valid & ATTR_ATIME) obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
4613         if(valid & ATTR_CTIME) obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
4614         if(valid & ATTR_MTIME) obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
4615
4616
4617         if(valid & ATTR_SIZE) yaffs_ResizeFile(obj,attr->ia_size);
4618
4619         yaffs_UpdateObjectHeader(obj,NULL,1);
4620
4621         return YAFFS_OK;
4622
4623 }
4624
4625 int yaffs_GetAttributes(yaffs_Object *obj, struct iattr *attr)
4626 {
4627         unsigned int valid = 0;
4628
4629         attr->ia_mode = obj->yst_mode;  valid |= ATTR_MODE;
4630         attr->ia_uid = obj->yst_uid;            valid |= ATTR_UID;
4631         attr->ia_gid = obj->yst_gid;            valid |= ATTR_GID;
4632
4633
4634         Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;        valid |= ATTR_ATIME;
4635         Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;        valid |= ATTR_CTIME;
4636         Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;        valid |= ATTR_MTIME;
4637
4638         attr->ia_size = yaffs_GetFileSize(obj); valid |= ATTR_SIZE;
4639
4640         attr->ia_valid = valid;
4641
4642         return YAFFS_OK;
4643
4644 }
4645
4646 #endif
4647
4648 int yaffs_DumpObject(yaffs_Object *obj)
4649 {
4650 //      __u8 buffer[YAFFS_BYTES_PER_CHUNK];
4651         char name[257];
4652 //      yaffs_ObjectHeader *oh = (yaffs_ObjectHeader *)buffer;
4653
4654 //      memset(buffer,0,YAFFS_BYTES_PER_CHUNK);
4655
4656 //      if(obj->chunkId >= 0)
4657 //      {
4658 //              yaffs_ReadChunkFromNAND(obj->myDev,obj->chunkId,buffer,NULL);
4659 //      }
4660
4661         yaffs_GetObjectName(obj,name,256);
4662
4663         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),
4664                         obj->objectId,yaffs_GetObjectInode(obj), name, obj->dirty, obj->valid, obj->serial,
4665                         obj->sum, obj->chunkId, yaffs_GetObjectType(obj), yaffs_GetObjectFileLength(obj)));
4666
4667 #if 0
4668         YPRINTF(("Object %d \"%s\"\n dirty %d valid %d serial %d sum %d chunk %d\n",
4669                         obj->objectId, oh->name, obj->dirty, obj->valid, obj->serial,
4670                         obj->sum, obj->chunkId));
4671                 switch(obj->variantType)
4672         {
4673                 case YAFFS_OBJECT_TYPE_FILE:
4674                         YPRINTF((" FILE length %d\n",obj->variant.fileVariant.fileSize));
4675                         break;
4676                 case YAFFS_OBJECT_TYPE_DIRECTORY:
4677                         YPRINTF((" DIRECTORY\n"));
4678                         break;
4679                 case YAFFS_OBJECT_TYPE_HARDLINK: //todo
4680                 case YAFFS_OBJECT_TYPE_SYMLINK:
4681                 case YAFFS_OBJECT_TYPE_UNKNOWN:
4682                 default:
4683         }
4684 #endif
4685
4686         return YAFFS_OK;
4687 }
4688
4689
4690 ///////////////////////// Initialisation code ///////////////////////////
4691
4692
4693
4694 int yaffs_GutsInitialise(yaffs_Device *dev)
4695 {
4696         unsigned x;
4697         int bits;
4698         int extraBits;
4699         int nBlocks;
4700
4701         if(     dev->nBytesPerChunk != YAFFS_BYTES_PER_CHUNK ||
4702                 dev->nChunksPerBlock < 2 ||
4703                 dev->nReservedBlocks < 2 ||
4704                 dev->startBlock < 0 ||
4705                 dev->endBlock <= 0 ||
4706                 dev->endBlock <= (dev->startBlock + dev->nReservedBlocks)
4707           )
4708         {
4709                 //these parameters must be set before stating yaffs
4710                 // Other parameters internalStartBlock,
4711                 return YAFFS_FAIL;
4712         }
4713
4714
4715
4716         if(!yaffs_CheckStructures())
4717         {
4718                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs_CheckStructures failed\n" TENDSTR)));
4719                 return YAFFS_FAIL;
4720         }
4721
4722         if(dev->isMounted)
4723         {
4724                 T(YAFFS_TRACE_ALWAYS,(TSTR("yaffs: device already mounted\n" TENDSTR)));
4725                 return YAFFS_FAIL;
4726         }
4727
4728         dev->isMounted = 1;
4729
4730         if(dev->startBlock < 0 ||
4731            (dev->endBlock - dev->startBlock) < 10)
4732         {
4733                 T(YAFFS_TRACE_ALWAYS,(TSTR("startBlock %d or endBlock %d invalid\n" TENDSTR),
4734                                 dev->startBlock, dev->endBlock));
4735                 return YAFFS_FAIL;
4736         }
4737
4738
4739         // Do we need to add an offset to use block 0?
4740
4741         dev->internalStartBlock = dev->startBlock;
4742         dev->internalEndBlock = dev->endBlock;
4743         dev->blockOffset = 0;
4744         dev->chunkOffset = 0;
4745
4746         if(dev->startBlock == 0)
4747         {
4748                 dev->internalStartBlock++;
4749                 dev->internalEndBlock++;
4750                 dev->blockOffset++;
4751                 dev->chunkOffset = dev->nChunksPerBlock;
4752         }
4753
4754
4755         nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
4756
4757
4758
4759         // OK now calculate a few things for the device
4760         // Calculate chunkGroupBits.
4761         // We need to find the next power of 2 > than internalEndBlock
4762
4763         x = dev->nChunksPerBlock * (dev->internalEndBlock+1);
4764
4765         for(bits = extraBits = 0; x > 1; bits++)
4766         {
4767                 if(x & 1) extraBits++;
4768                 x >>= 1;
4769         }
4770
4771         if(extraBits > 0) bits++;
4772
4773
4774         // Level0 Tnodes are 16 bits, so if the bitwidth of the
4775         // chunk range we're using is greater than 16 we need
4776         // to figure out chunk shift and chunkGroupSize
4777         if(bits <= 16)
4778         {
4779                 dev->chunkGroupBits = 0;
4780         }
4781         else
4782         {
4783                 dev->chunkGroupBits = bits - 16;
4784         }
4785
4786         dev->chunkGroupSize = 1 << dev->chunkGroupBits;
4787
4788         if(dev->nChunksPerBlock < dev->chunkGroupSize)
4789         {
4790                 // We have a problem because the soft delete won't work if
4791                 // the chunk group size > chunks per block.
4792                 // This can be remedied by using larger "virtual blocks".
4793
4794                 return YAFFS_FAIL;
4795         }
4796
4797
4798
4799
4800         // More device initialisation
4801         dev->garbageCollections = 0;
4802         dev->passiveGarbageCollections = 0;
4803         dev->currentDirtyChecker = 0;
4804         dev->bufferedBlock = -1;
4805         dev->doingBufferedBlockRewrite = 0;
4806         dev->nDeletedFiles = 0;
4807         dev->nBackgroundDeletions=0;
4808         dev->nUnlinkedFiles = 0;
4809         dev->eccFixed=0;
4810         dev->eccUnfixed=0;
4811         dev->tagsEccFixed=0;
4812         dev->tagsEccUnfixed=0;
4813         dev->nErasedBlocks=0;
4814
4815         dev->localBuffer = YMALLOC(dev->nBytesPerChunk);
4816
4817
4818
4819
4820         yaffs_InitialiseBlocks(dev,nBlocks);
4821
4822         yaffs_InitialiseTnodes(dev);
4823
4824         yaffs_InitialiseObjects(dev);
4825
4826         if(dev->nShortOpCaches > 0)
4827         {
4828                 int i;
4829
4830                 if(dev->nShortOpCaches >  YAFFS_MAX_SHORT_OP_CACHES)
4831                 {
4832                         dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
4833                 }
4834
4835                 dev->srCache = YMALLOC( dev->nShortOpCaches * sizeof(yaffs_ChunkCache));
4836
4837                 for(i=0; i < dev->nShortOpCaches; i++)
4838                 {
4839                         dev->srCache[i].object = NULL;
4840                         dev->srCache[i].lastUse = 0;
4841                         dev->srCache[i].dirty = 0;
4842                 }
4843                 dev->srLastUse = 0;
4844         }
4845
4846         dev->cacheHits = 0;
4847
4848
4849         // Initialise the unlinked, root and lost and found directories
4850         dev->lostNFoundDir = dev->rootDir = dev->unlinkedDir = NULL;
4851
4852         dev->unlinkedDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_UNLINKED, S_IFDIR);
4853
4854         dev->rootDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_ROOT,YAFFS_ROOT_MODE | S_IFDIR);
4855         dev->lostNFoundDir = yaffs_CreateFakeDirectory(dev,YAFFS_OBJECTID_LOSTNFOUND,YAFFS_LOSTNFOUND_MODE | S_IFDIR);
4856         yaffs_AddObjectToDirectory(dev->rootDir,dev->lostNFoundDir);
4857
4858
4859         // Now scan the flash.
4860         yaffs_Scan(dev);
4861
4862         // Zero out stats
4863         dev->nPageReads = 0;
4864     dev->nPageWrites =  0;
4865         dev->nBlockErasures = 0;
4866         dev->nGCCopies = 0;
4867         dev->nRetriedWrites = 0;
4868         dev->nRetiredBlocks = 0;
4869
4870
4871         return YAFFS_OK;
4872
4873 }
4874
4875 void yaffs_Deinitialise(yaffs_Device *dev)
4876 {
4877         if(dev->isMounted)
4878         {
4879
4880                 yaffs_DeinitialiseBlocks(dev);
4881                 yaffs_DeinitialiseTnodes(dev);
4882                 yaffs_DeinitialiseObjects(dev);
4883                 if(dev->nShortOpCaches > 0)
4884                         YFREE(dev->srCache);
4885                 YFREE(dev->localBuffer);
4886                 dev->isMounted = 0;
4887         }
4888
4889 }
4890
4891 #if 0
4892
4893 int  yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
4894 {
4895         int nFree = dev->nFreeChunks - (dev->nChunksPerBlock * YAFFS_RESERVED_BLOCKS);
4896
4897         struct list_head *i;
4898         yaffs_Object *l;
4899
4900
4901         // To the free chunks add the chunks that are in the deleted unlinked files.
4902         list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
4903         {
4904                 l = list_entry(i, yaffs_Object,siblings);
4905                 if(l->deleted)
4906                 {
4907                         nFree++;
4908                         nFree += l->nDataChunks;
4909                 }
4910         }
4911
4912
4913         // printf("___________ nFreeChunks is %d nFree is %d\n",dev->nFreeChunks,nFree);
4914
4915         if(nFree < 0) nFree = 0;
4916
4917         return nFree;
4918
4919 }
4920
4921 #endif
4922
4923 int  yaffs_GetNumberOfFreeChunks(yaffs_Device *dev)
4924 {
4925         int nFree;
4926         int pending;
4927         int b;
4928         int nDirtyCacheChunks=0;
4929
4930         yaffs_BlockInfo *blk;
4931
4932         struct list_head *i;
4933         yaffs_Object *l;
4934
4935         for(nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock; b++)
4936         {
4937                 blk = yaffs_GetBlockInfo(dev,b);
4938
4939                 switch(blk->blockState)
4940                 {
4941                         case YAFFS_BLOCK_STATE_EMPTY:
4942                         case YAFFS_BLOCK_STATE_ALLOCATING:
4943                         case YAFFS_BLOCK_STATE_FULL: nFree += (dev->nChunksPerBlock - blk->pagesInUse); break;
4944                         default: break;
4945                 }
4946         }
4947
4948
4949         pending = 0;
4950
4951         // To the free chunks add the chunks that are in the deleted unlinked files.
4952         list_for_each(i,&dev->unlinkedDir->variant.directoryVariant.children)
4953         {
4954                 if(i)
4955                 {
4956                         l = list_entry(i, yaffs_Object,siblings);
4957                         if(l->deleted)
4958                         {
4959                                 pending++;
4960                                 pending += l->nDataChunks;
4961                         }
4962                 }
4963         }
4964
4965
4966
4967         //printf("___________ really free is %d, pending %d, nFree is %d\n",nFree,pending, nFree+pending);
4968
4969         if(nFree != dev->nFreeChunks)
4970         {
4971         //      printf("___________Different! really free is %d, nFreeChunks %d\n",nFree dev->nFreeChunks);
4972         }
4973
4974         nFree += pending;
4975
4976         // Now count the number of dirty chunks in the cache and subtract those
4977
4978         {
4979                 int i;
4980                 for(i = 0; i < dev->nShortOpCaches; i++)
4981                 {
4982                         if(dev->srCache[i].dirty) nDirtyCacheChunks++;
4983                 }
4984         }
4985
4986         nFree -= nDirtyCacheChunks;
4987
4988         nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
4989
4990         if(nFree < 0) nFree = 0;
4991
4992         return nFree;
4993
4994 }
4995
4996
4997
4998 /////////////////// YAFFS test code //////////////////////////////////
4999
5000 #define yaffs_CheckStruct(structure,syze, name) \
5001            if(sizeof(structure) != syze) \
5002                { \
5003                  T(YAFFS_TRACE_ALWAYS,(TSTR("%s should be %d but is %d\n" TENDSTR),name,syze,sizeof(structure))); \
5004                  return YAFFS_FAIL; \
5005                    }
5006
5007
5008 static int yaffs_CheckStructures(void)
5009 {
5010         yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags")
5011         yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion")
5012         yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare")
5013 #ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
5014         yaffs_CheckStruct(yaffs_Tnode,2* YAFFS_NTNODES_LEVEL0,"yaffs_Tnode")
5015 #endif
5016         yaffs_CheckStruct(yaffs_ObjectHeader,512,"yaffs_ObjectHeader")
5017
5018
5019         return YAFFS_OK;
5020 }
5021
5022 #if 0
5023 void yaffs_GutsTest(yaffs_Device *dev)
5024 {
5025
5026         if(yaffs_CheckStructures() != YAFFS_OK)
5027         {
5028                 T(YAFFS_TRACE_ALWAYS,(TSTR("One or more structures malformed-- aborting\n" TENDSTR)));
5029                 return;
5030         }
5031
5032         yaffs_TnodeTest(dev);
5033         yaffs_ObjectTest(dev);
5034 }
5035 #endif
5036
5037
5038
5039
5040
5041
5042