drivers/mtd/inftlmount.c

   1 /*
   2  * inftlmount.c -- INFTL mount code with extensive checks.
   3  *
   4  * Author: Greg Ungerer (gerg@snapgear.com)
   5  * (C) Copyright 2002-2003, Greg Ungerer (gerg@snapgear.com)
   6  *
   7  * Based heavily on the nftlmount.c code which is:
   8  * Author: Fabrice Bellard (fabrice.bellard@netgem.com)
   9  * Copyright (C) 2000 Netgem S.A.
  10  *
  11  * $Id: inftlmount.c,v 1.14 2004/08/09 13:57:42 dwmw2 Exp $
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  26  */
  27
  28 #include <linux/kernel.h>
  29 #include <linux/module.h>
  30 #include <asm/errno.h>
  31 #include <asm/io.h>
  32 #include <asm/uaccess.h>
  33 #include <linux/miscdevice.h>
  34 #include <linux/pci.h>
  35 #include <linux/delay.h>
  36 #include <linux/slab.h>
  37 #include <linux/sched.h>
  38 #include <linux/init.h>
  39 #include <linux/mtd/mtd.h>
  40 #include <linux/mtd/nftl.h>
  41 #include <linux/mtd/inftl.h>
  42 #include <linux/mtd/compatmac.h>
  43
  44 char inftlmountrev[]="$Revision: 1.14 $";
  45
  46 /*
  47  * find_boot_record: Find the INFTL Media Header and its Spare copy which
  48  *      contains the various device information of the INFTL partition and
  49  *      Bad Unit Table. Update the PUtable[] table according to the Bad
  50  *      Unit Table. PUtable[] is used for management of Erase Unit in
  51  *      other routines in inftlcore.c and inftlmount.c.
  52  */
  53 static int find_boot_record(struct INFTLrecord *inftl)
  54 {
  55         struct inftl_unittail h1;
  56         //struct inftl_oob oob;
  57         unsigned int i, block;
  58         u8 buf[SECTORSIZE];
  59         struct INFTLMediaHeader *mh = &inftl->MediaHdr;
  60         struct INFTLPartition *ip;
  61         size_t retlen;
  62
  63         DEBUG(MTD_DEBUG_LEVEL3, "INFTL: find_boot_record(inftl=%p)\n", inftl);
  64
  65         /*
  66          * Assume logical EraseSize == physical erasesize for starting the
  67          * scan. We'll sort it out later if we find a MediaHeader which says
  68          * otherwise.
  69          */
  70         inftl->EraseSize = inftl->mbd.mtd->erasesize;
  71         inftl->nb_blocks = inftl->mbd.mtd->size / inftl->EraseSize;
  72
  73         inftl->MediaUnit = BLOCK_NIL;
  74
  75         /* Search for a valid boot record */
  76         for (block = 0; block < inftl->nb_blocks; block++) {
  77                 int ret;
  78
  79                 /*
  80                  * Check for BNAND header first. Then whinge if it's found
  81                  * but later checks fail.
  82                  */
  83                 ret = MTD_READ(inftl->mbd.mtd, block * inftl->EraseSize,
  84                     SECTORSIZE, &retlen, buf);
  85                 /* We ignore ret in case the ECC of the MediaHeader is invalid
  86                    (which is apparently acceptable) */
  87                 if (retlen != SECTORSIZE) {
  88                         static int warncount = 5;
  89
  90                         if (warncount) {
  91                                 printk(KERN_WARNING "INFTL: block read at 0x%x "
  92                                         "of mtd%d failed: %d\n",
  93                                         block * inftl->EraseSize,
  94                                         inftl->mbd.mtd->index, ret);
  95                                 if (!--warncount)
  96                                         printk(KERN_WARNING "INFTL: further "
  97                                                 "failures for this block will "
  98                                                 "not be printed\n");
  99                         }
 100                         continue;
 101                 }
 102
 103                 if (retlen < 6 || memcmp(buf, "BNAND", 6)) {
 104                         /* BNAND\0 not found. Continue */
 105                         continue;
 106                 }
 107
 108                 /* To be safer with BIOS, also use erase mark as discriminant */
 109                 if ((ret = MTD_READOOB(inftl->mbd.mtd, block * inftl->EraseSize +
 110                     SECTORSIZE + 8, 8, &retlen, (char *)&h1) < 0)) {
 111                         printk(KERN_WARNING "INFTL: ANAND header found at "
 112                                 "0x%x in mtd%d, but OOB data read failed "
 113                                 "(err %d)\n", block * inftl->EraseSize,
 114                                 inftl->mbd.mtd->index, ret);
 115                         continue;
 116                 }
 117
 118
 119                 /*
 120                  * This is the first we've seen.
 121                  * Copy the media header structure into place.
 122                  */
 123                 memcpy(mh, buf, sizeof(struct INFTLMediaHeader));
 124
 125                 /* Read the spare media header at offset 4096 */
 126                 MTD_READ(inftl->mbd.mtd, block * inftl->EraseSize + 4096,
 127                     SECTORSIZE, &retlen, buf);
 128                 if (retlen != SECTORSIZE) {
 129                         printk(KERN_WARNING "INFTL: Unable to read spare "
 130                                "Media Header\n");
 131                         return -1;
 132                 }
 133                 /* Check if this one is the same as the first one we found. */
 134                 if (memcmp(mh, buf, sizeof(struct INFTLMediaHeader))) {
 135                         printk(KERN_WARNING "INFTL: Primary and spare Media "
 136                                "Headers disagree.\n");
 137                         return -1;
 138                 }
 139
 140                 mh->NoOfBootImageBlocks = le32_to_cpu(mh->NoOfBootImageBlocks);
 141                 mh->NoOfBinaryPartitions = le32_to_cpu(mh->NoOfBinaryPartitions);
 142                 mh->NoOfBDTLPartitions = le32_to_cpu(mh->NoOfBDTLPartitions);
 143                 mh->BlockMultiplierBits = le32_to_cpu(mh->BlockMultiplierBits);
 144                 mh->FormatFlags = le32_to_cpu(mh->FormatFlags);
 145                 mh->PercentUsed = le32_to_cpu(mh->PercentUsed);
 146
 147 #ifdef CONFIG_MTD_DEBUG_VERBOSE
 148                 if (CONFIG_MTD_DEBUG_VERBOSE >= 2) {
 149                         printk("INFTL: Media Header ->\n"
 150                                 "    bootRecordID          = %s\n"
 151                                 "    NoOfBootImageBlocks   = %d\n"
 152                                 "    NoOfBinaryPartitions  = %d\n"
 153                                 "    NoOfBDTLPartitions    = %d\n"
 154                                 "    BlockMultiplerBits    = %d\n"
 155                                 "    FormatFlgs            = %d\n"
 156                                 "    OsakVersion           = 0x%x\n"
 157                                 "    PercentUsed           = %d\n",
 158                                 mh->bootRecordID, mh->NoOfBootImageBlocks,
 159                                 mh->NoOfBinaryPartitions,
 160                                 mh->NoOfBDTLPartitions,
 161                                 mh->BlockMultiplierBits, mh->FormatFlags,
 162                                 mh->OsakVersion, mh->PercentUsed);
 163                 }
 164 #endif
 165
 166                 if (mh->NoOfBDTLPartitions == 0) {
 167                         printk(KERN_WARNING "INFTL: Media Header sanity check "
 168                                 "failed: NoOfBDTLPartitions (%d) == 0, "
 169                                 "must be at least 1\n", mh->NoOfBDTLPartitions);
 170                         return -1;
 171                 }
 172
 173                 if ((mh->NoOfBDTLPartitions + mh->NoOfBinaryPartitions) > 4) {
 174                         printk(KERN_WARNING "INFTL: Media Header sanity check "
 175                                 "failed: Total Partitions (%d) > 4, "
 176                                 "BDTL=%d Binary=%d\n", mh->NoOfBDTLPartitions +
 177                                 mh->NoOfBinaryPartitions,
 178                                 mh->NoOfBDTLPartitions,
 179                                 mh->NoOfBinaryPartitions);
 180                         return -1;
 181                 }
 182
 183                 if (mh->BlockMultiplierBits > 1) {
 184                         printk(KERN_WARNING "INFTL: sorry, we don't support "
 185                                 "UnitSizeFactor 0x%02x\n",
 186                                 mh->BlockMultiplierBits);
 187                         return -1;
 188                 } else if (mh->BlockMultiplierBits == 1) {
 189                         printk(KERN_WARNING "INFTL: support for INFTL with "
 190                                 "UnitSizeFactor 0x%02x is experimental\n",
 191                                 mh->BlockMultiplierBits);
 192                         inftl->EraseSize = inftl->mbd.mtd->erasesize <<
 193                                 mh->BlockMultiplierBits;
 194                         inftl->nb_blocks = inftl->mbd.mtd->size / inftl->EraseSize;
 195                         block >>= mh->BlockMultiplierBits;
 196                 }
 197
 198                 /* Scan the partitions */
 199                 for (i = 0; (i < 4); i++) {
 200                         ip = &mh->Partitions[i];
 201                         ip->virtualUnits = le32_to_cpu(ip->virtualUnits);
 202                         ip->firstUnit = le32_to_cpu(ip->firstUnit);
 203                         ip->lastUnit = le32_to_cpu(ip->lastUnit);
 204                         ip->flags = le32_to_cpu(ip->flags);
 205                         ip->spareUnits = le32_to_cpu(ip->spareUnits);
 206                         ip->Reserved0 = le32_to_cpu(ip->Reserved0);
 207
 208 #ifdef CONFIG_MTD_DEBUG_VERBOSE
 209                         if (CONFIG_MTD_DEBUG_VERBOSE >= 2) {
 210                                 printk("    PARTITION[%d] ->\n"
 211                                         "        virtualUnits    = %d\n"
 212                                         "        firstUnit       = %d\n"
 213                                         "        lastUnit        = %d\n"
 214                                         "        flags           = 0x%x\n"
 215                                         "        spareUnits      = %d\n",
 216                                         i, ip->virtualUnits, ip->firstUnit,
 217                                         ip->lastUnit, ip->flags,
 218                                         ip->spareUnits);
 219                         }
 220 #endif
 221
 222                         if (ip->Reserved0 != ip->firstUnit) {
 223                                 struct erase_info *instr = &inftl->instr;
 224
 225                                 /*
 226                                  *      Most likely this is using the
 227                                  *      undocumented qiuck mount feature.
 228                                  *      We don't support that, we will need
 229                                  *      to erase the hidden block for full
 230                                  *      compatibility.
 231                                  */
 232                                 instr->addr = ip->Reserved0 * inftl->EraseSize;
 233                                 instr->len = inftl->EraseSize;
 234                                 MTD_ERASE(inftl->mbd.mtd, instr);
 235                         }
 236                         if ((ip->lastUnit - ip->firstUnit + 1) < ip->virtualUnits) {
 237                                 printk(KERN_WARNING "INFTL: Media Header "
 238                                         "Partition %d sanity check failed\n"
 239                                         "    firstUnit %d : lastUnit %d  >  "
 240                                         "virtualUnits %d\n", i, ip->lastUnit,
 241                                         ip->firstUnit, ip->Reserved0);
 242                                 return -1;
 243                         }
 244                         if (ip->Reserved1 != 0) {
 245                                 printk(KERN_WARNING "INFTL: Media Header "
 246                                         "Partition %d sanity check failed: "
 247                                         "Reserved1 %d != 0\n",
 248                                         i, ip->Reserved1);
 249                                 return -1;
 250                         }
 251
 252                         if (ip->flags & INFTL_BDTL)
 253                                 break;
 254                 }
 255
 256                 if (i >= 4) {
 257                         printk(KERN_WARNING "INFTL: Media Header Partition "
 258                                 "sanity check failed:\n       No partition "
 259                                 "marked as Disk Partition\n");
 260                         return -1;
 261                 }
 262
 263                 inftl->nb_boot_blocks = ip->firstUnit;
 264                 inftl->numvunits = ip->virtualUnits;
 265                 if (inftl->numvunits > (inftl->nb_blocks -
 266                     inftl->nb_boot_blocks - 2)) {
 267                         printk(KERN_WARNING "INFTL: Media Header sanity check "
 268                                 "failed:\n        numvunits (%d) > nb_blocks "
 269                                 "(%d) - nb_boot_blocks(%d) - 2\n",
 270                                 inftl->numvunits, inftl->nb_blocks,
 271                                 inftl->nb_boot_blocks);
 272                         return -1;
 273                 }
 274
 275                 inftl->mbd.size  = inftl->numvunits *
 276                         (inftl->EraseSize / SECTORSIZE);
 277
 278                 /*
 279                  * Block count is set to last used EUN (we won't need to keep
 280                  * any meta-data past that point).
 281                  */
 282                 inftl->firstEUN = ip->firstUnit;
 283                 inftl->lastEUN = ip->lastUnit;
 284                 inftl->nb_blocks = ip->lastUnit + 1;
 285
 286                 /* Memory alloc */
 287                 inftl->PUtable = kmalloc(inftl->nb_blocks * sizeof(u16), GFP_KERNEL);
 288                 if (!inftl->PUtable) {
 289                         printk(KERN_WARNING "INFTL: allocation of PUtable "
 290                                 "failed (%zd bytes)\n",
 291                                 inftl->nb_blocks * sizeof(u16));
 292                         return -ENOMEM;
 293                 }
 294
 295                 inftl->VUtable = kmalloc(inftl->nb_blocks * sizeof(u16), GFP_KERNEL);
 296                 if (!inftl->VUtable) {
 297                         kfree(inftl->PUtable);
 298                         printk(KERN_WARNING "INFTL: allocation of VUtable "
 299                                 "failed (%zd bytes)\n",
 300                                 inftl->nb_blocks * sizeof(u16));
 301                         return -ENOMEM;
 302                 }
 303
 304                 /* Mark the blocks before INFTL MediaHeader as reserved */
 305                 for (i = 0; i < inftl->nb_boot_blocks; i++)
 306                         inftl->PUtable[i] = BLOCK_RESERVED;
 307                 /* Mark all remaining blocks as potentially containing data */
 308                 for (; i < inftl->nb_blocks; i++)
 309                         inftl->PUtable[i] = BLOCK_NOTEXPLORED;
 310
 311                 /* Mark this boot record (NFTL MediaHeader) block as reserved */
 312                 inftl->PUtable[block] = BLOCK_RESERVED;
 313
 314                 /* Read Bad Erase Unit Table and modify PUtable[] accordingly */
 315                 for (i = 0; i < inftl->nb_blocks; i++) {
 316                         int physblock;
 317                         /* If any of the physical eraseblocks are bad, don't
 318                            use the unit. */
 319                         for (physblock = 0; physblock < inftl->EraseSize; physblock += inftl->mbd.mtd->erasesize) {
 320                                 if (inftl->mbd.mtd->block_isbad(inftl->mbd.mtd, i * inftl->EraseSize + physblock))
 321                                         inftl->PUtable[i] = BLOCK_RESERVED;
 322                         }
 323                 }
 324
 325                 inftl->MediaUnit = block;
 326                 return 0;
 327         }
 328
 329         /* Not found. */
 330         return -1;
 331 }
 332
 333 static int memcmpb(void *a, int c, int n)
 334 {
 335         int i;
 336         for (i = 0; i < n; i++) {
 337                 if (c != ((unsigned char *)a)[i])
 338                         return 1;
 339         }
 340         return 0;
 341 }
 342
 343 /*
 344  * check_free_sector: check if a free sector is actually FREE,
 345  *      i.e. All 0xff in data and oob area.
 346  */
 347 static int check_free_sectors(struct INFTLrecord *inftl, unsigned int address,
 348         int len, int check_oob)
 349 {
 350         u8 buf[SECTORSIZE + inftl->mbd.mtd->oobsize];
 351         size_t retlen;
 352         int i;
 353
 354         DEBUG(MTD_DEBUG_LEVEL3, "INFTL: check_free_sectors(inftl=%p,"
 355                 "address=0x%x,len=%d,check_oob=%d)\n", inftl,
 356                 address, len, check_oob);
 357
 358         for (i = 0; i < len; i += SECTORSIZE) {
 359                 if (MTD_READECC(inftl->mbd.mtd, address, SECTORSIZE, &retlen, buf, &buf[SECTORSIZE], &inftl->oobinfo) < 0)
 360                         return -1;
 361                 if (memcmpb(buf, 0xff, SECTORSIZE) != 0)
 362                         return -1;
 363
 364                 if (check_oob) {
 365                         if (memcmpb(buf + SECTORSIZE, 0xff, inftl->mbd.mtd->oobsize) != 0)
 366                                 return -1;
 367                 }
 368                 address += SECTORSIZE;
 369         }
 370
 371         return 0;
 372 }
 373
 374 /*
 375  * INFTL_format: format a Erase Unit by erasing ALL Erase Zones in the Erase
 376  *               Unit and Update INFTL metadata. Each erase operation is
 377  *               checked with check_free_sectors.
 378  *
 379  * Return: 0 when succeed, -1 on error.
 380  *
 381  * ToDo: 1. Is it neceressary to check_free_sector after erasing ??
 382  */
 383 int INFTL_formatblock(struct INFTLrecord *inftl, int block)
 384 {
 385         size_t retlen;
 386         struct inftl_unittail uci;
 387         struct erase_info *instr = &inftl->instr;
 388         int physblock;
 389
 390         DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_formatblock(inftl=%p,"
 391                 "block=%d)\n", inftl, block);
 392
 393         memset(instr, 0, sizeof(struct erase_info));
 394
 395         /* FIXME: Shouldn't we be setting the 'discarded' flag to zero
 396            _first_? */
 397
 398         /* Use async erase interface, test return code */
 399         instr->addr = block * inftl->EraseSize;
 400         instr->len = inftl->mbd.mtd->erasesize;
 401         /* Erase one physical eraseblock at a time, even though the NAND api
 402            allows us to group them.  This way we if we have a failure, we can
 403            mark only the failed block in the bbt. */
 404         for (physblock = 0; physblock < inftl->EraseSize; physblock += instr->len, instr->addr += instr->len) {
 405                 MTD_ERASE(inftl->mbd.mtd, instr);
 406
 407                 if (instr->state == MTD_ERASE_FAILED) {
 408                         printk(KERN_WARNING "INFTL: error while formatting block %d\n",
 409                                 block);
 410                         goto fail;
 411                 }
 412
 413                 /*
 414                 * Check the "freeness" of Erase Unit before updating metadata.
 415                 * FixMe: is this check really necessary? Since we have check the
 416                 *        return code after the erase operation.
 417                 */
 418                 if (check_free_sectors(inftl, instr->addr, instr->len, 1) != 0)
 419                         goto fail;
 420         }
 421
 422         uci.EraseMark = cpu_to_le16(ERASE_MARK);
 423         uci.EraseMark1 = cpu_to_le16(ERASE_MARK);
 424         uci.Reserved[0] = 0;
 425         uci.Reserved[1] = 0;
 426         uci.Reserved[2] = 0;
 427         uci.Reserved[3] = 0;
 428         instr->addr = block * inftl->EraseSize + SECTORSIZE * 2;
 429         if (MTD_WRITEOOB(inftl->mbd.mtd, instr->addr +
 430             8, 8, &retlen, (char *)&uci) < 0)
 431                 goto fail;
 432         return 0;
 433 fail:
 434         /* could not format, update the bad block table (caller is responsible
 435            for setting the PUtable to BLOCK_RESERVED on failure) */
 436         inftl->mbd.mtd->block_markbad(inftl->mbd.mtd, instr->addr);
 437         return -1;
 438 }
 439
 440 /*
 441  * format_chain: Format an invalid Virtual Unit chain. It frees all the Erase
 442  *      Units in a Virtual Unit Chain, i.e. all the units are disconnected.
 443  *
 444  *      Since the chain is invalid then we will have to erase it from its
 445  *      head (normally for INFTL we go from the oldest). But if it has a
 446  *      loop then there is no oldest...
 447  */
 448 static void format_chain(struct INFTLrecord *inftl, unsigned int first_block)
 449 {
 450         unsigned int block = first_block, block1;
 451
 452         printk(KERN_WARNING "INFTL: formatting chain at block %d\n",
 453                 first_block);
 454
 455         for (;;) {
 456                 block1 = inftl->PUtable[block];
 457
 458                 printk(KERN_WARNING "INFTL: formatting block %d\n", block);
 459                 if (INFTL_formatblock(inftl, block) < 0) {
 460                         /*
 461                          * Cannot format !!!! Mark it as Bad Unit,
 462                          */
 463                         inftl->PUtable[block] = BLOCK_RESERVED;
 464                 } else {
 465                         inftl->PUtable[block] = BLOCK_FREE;
 466                 }
 467
 468                 /* Goto next block on the chain */
 469                 block = block1;
 470
 471                 if (block == BLOCK_NIL || block >= inftl->lastEUN)
 472                         break;
 473         }
 474 }
 475
 476 void INFTL_dumptables(struct INFTLrecord *s)
 477 {
 478         int i;
 479
 480         printk("-------------------------------------------"
 481                 "----------------------------------\n");
 482
 483         printk("VUtable[%d] ->", s->nb_blocks);
 484         for (i = 0; i < s->nb_blocks; i++) {
 485                 if ((i % 8) == 0)
 486                         printk("\n%04x: ", i);
 487                 printk("%04x ", s->VUtable[i]);
 488         }
 489
 490         printk("\n-------------------------------------------"
 491                 "----------------------------------\n");
 492
 493         printk("PUtable[%d-%d=%d] ->", s->firstEUN, s->lastEUN, s->nb_blocks);
 494         for (i = 0; i <= s->lastEUN; i++) {
 495                 if ((i % 8) == 0)
 496                         printk("\n%04x: ", i);
 497                 printk("%04x ", s->PUtable[i]);
 498         }
 499
 500         printk("\n-------------------------------------------"
 501                 "----------------------------------\n");
 502
 503         printk("INFTL ->\n"
 504                 "  EraseSize       = %d\n"
 505                 "  h/s/c           = %d/%d/%d\n"
 506                 "  numvunits       = %d\n"
 507                 "  firstEUN        = %d\n"
 508                 "  lastEUN         = %d\n"
 509                 "  numfreeEUNs     = %d\n"
 510                 "  LastFreeEUN     = %d\n"
 511                 "  nb_blocks       = %d\n"
 512                 "  nb_boot_blocks  = %d",
 513                 s->EraseSize, s->heads, s->sectors, s->cylinders,
 514                 s->numvunits, s->firstEUN, s->lastEUN, s->numfreeEUNs,
 515                 s->LastFreeEUN, s->nb_blocks, s->nb_boot_blocks);
 516
 517         printk("\n-------------------------------------------"
 518                 "----------------------------------\n");
 519 }
 520
 521 void INFTL_dumpVUchains(struct INFTLrecord *s)
 522 {
 523         int logical, block, i;
 524
 525         printk("-------------------------------------------"
 526                 "----------------------------------\n");
 527
 528         printk("INFTL Virtual Unit Chains:\n");
 529         for (logical = 0; logical < s->nb_blocks; logical++) {
 530                 block = s->VUtable[logical];
 531                 if (block > s->nb_blocks)
 532                         continue;
 533                 printk("  LOGICAL %d --> %d ", logical, block);
 534                 for (i = 0; i < s->nb_blocks; i++) {
 535                         if (s->PUtable[block] == BLOCK_NIL)
 536                                 break;
 537                         block = s->PUtable[block];
 538                         printk("%d ", block);
 539                 }
 540                 printk("\n");
 541         }
 542
 543         printk("-------------------------------------------"
 544                 "----------------------------------\n");
 545 }
 546
 547 int INFTL_mount(struct INFTLrecord *s)
 548 {
 549         unsigned int block, first_block, prev_block, last_block;
 550         unsigned int first_logical_block, logical_block, erase_mark;
 551         int chain_length, do_format_chain;
 552         struct inftl_unithead1 h0;
 553         struct inftl_unittail h1;
 554         size_t retlen;
 555         int i;
 556         u8 *ANACtable, ANAC;
 557
 558         DEBUG(MTD_DEBUG_LEVEL3, "INFTL: INFTL_mount(inftl=%p)\n", s);
 559
 560         /* Search for INFTL MediaHeader and Spare INFTL Media Header */
 561         if (find_boot_record(s) < 0) {
 562                 printk(KERN_WARNING "INFTL: could not find valid boot record?\n");
 563                 return -1;
 564         }
 565
 566         /* Init the logical to physical table */
 567         for (i = 0; i < s->nb_blocks; i++)
 568                 s->VUtable[i] = BLOCK_NIL;
 569
 570         logical_block = block = BLOCK_NIL;
 571
 572         /* Temporary buffer to store ANAC numbers. */
 573         ANACtable = kmalloc(s->nb_blocks * sizeof(u8), GFP_KERNEL);
 574         memset(ANACtable, 0, s->nb_blocks);
 575
 576         /*
 577          * First pass is to explore each physical unit, and construct the
 578          * virtual chains that exist (newest physical unit goes into VUtable).
 579          * Any block that is in any way invalid will be left in the
 580          * NOTEXPLORED state. Then at the end we will try to format it and
 581          * mark it as free.
 582          */
 583         DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 1, explore each unit\n");
 584         for (first_block = s->firstEUN; first_block <= s->lastEUN; first_block++) {
 585                 if (s->PUtable[first_block] != BLOCK_NOTEXPLORED)
 586                         continue;
 587
 588                 do_format_chain = 0;
 589                 first_logical_block = BLOCK_NIL;
 590                 last_block = BLOCK_NIL;
 591                 block = first_block;
 592
 593                 for (chain_length = 0; ; chain_length++) {
 594
 595                         if ((chain_length == 0) &&
 596                             (s->PUtable[block] != BLOCK_NOTEXPLORED)) {
 597                                 /* Nothing to do here, onto next block */
 598                                 break;
 599                         }
 600
 601                         if (MTD_READOOB(s->mbd.mtd, block * s->EraseSize + 8,
 602                             8, &retlen, (char *)&h0) < 0 ||
 603                             MTD_READOOB(s->mbd.mtd, block * s->EraseSize +
 604                             2 * SECTORSIZE + 8, 8, &retlen, (char *)&h1) < 0) {
 605                                 /* Should never happen? */
 606                                 do_format_chain++;
 607                                 break;
 608                         }
 609
 610                         logical_block = le16_to_cpu(h0.virtualUnitNo);
 611                         prev_block = le16_to_cpu(h0.prevUnitNo);
 612                         erase_mark = le16_to_cpu((h1.EraseMark | h1.EraseMark1));
 613                         ANACtable[block] = h0.ANAC;
 614
 615                         /* Previous block is relative to start of Partition */
 616                         if (prev_block < s->nb_blocks)
 617                                 prev_block += s->firstEUN;
 618
 619                         /* Already explored partial chain? */
 620                         if (s->PUtable[block] != BLOCK_NOTEXPLORED) {
 621                                 /* Check if chain for this logical */
 622                                 if (logical_block == first_logical_block) {
 623                                         if (last_block != BLOCK_NIL)
 624                                                 s->PUtable[last_block] = block;
 625                                 }
 626                                 break;
 627                         }
 628
 629                         /* Check for invalid block */
 630                         if (erase_mark != ERASE_MARK) {
 631                                 printk(KERN_WARNING "INFTL: corrupt block %d "
 632                                         "in chain %d, chain length %d, erase "
 633                                         "mark 0x%x?\n", block, first_block,
 634                                         chain_length, erase_mark);
 635                                 /*
 636                                  * Assume end of chain, probably incomplete
 637                                  * fold/erase...
 638                                  */
 639                                 if (chain_length == 0)
 640                                         do_format_chain++;
 641                                 break;
 642                         }
 643
 644                         /* Check for it being free already then... */
 645                         if ((logical_block == BLOCK_FREE) ||
 646                             (logical_block == BLOCK_NIL)) {
 647                                 s->PUtable[block] = BLOCK_FREE;
 648                                 break;
 649                         }
 650
 651                         /* Sanity checks on block numbers */
 652                         if ((logical_block >= s->nb_blocks) ||
 653                             ((prev_block >= s->nb_blocks) &&
 654                              (prev_block != BLOCK_NIL))) {
 655                                 if (chain_length > 0) {
 656                                         printk(KERN_WARNING "INFTL: corrupt "
 657                                                 "block %d in chain %d?\n",
 658                                                 block, first_block);
 659                                         do_format_chain++;
 660                                 }
 661                                 break;
 662                         }
 663
 664                         if (first_logical_block == BLOCK_NIL) {
 665                                 first_logical_block = logical_block;
 666                         } else {
 667                                 if (first_logical_block != logical_block) {
 668                                         /* Normal for folded chain... */
 669                                         break;
 670                                 }
 671                         }
 672
 673                         /*
 674                          * Current block is valid, so if we followed a virtual
 675                          * chain to get here then we can set the previous
 676                          * block pointer in our PUtable now. Then move onto
 677                          * the previous block in the chain.
 678                          */
 679                         s->PUtable[block] = BLOCK_NIL;
 680                         if (last_block != BLOCK_NIL)
 681                                 s->PUtable[last_block] = block;
 682                         last_block = block;
 683                         block = prev_block;
 684
 685                         /* Check for end of chain */
 686                         if (block == BLOCK_NIL)
 687                                 break;
 688
 689                         /* Validate next block before following it... */
 690                         if (block > s->lastEUN) {
 691                                 printk(KERN_WARNING "INFTL: invalid previous "
 692                                         "block %d in chain %d?\n", block,
 693                                         first_block);
 694                                 do_format_chain++;
 695                                 break;
 696                         }
 697                 }
 698
 699                 if (do_format_chain) {
 700                         format_chain(s, first_block);
 701                         continue;
 702                 }
 703
 704                 /*
 705                  * Looks like a valid chain then. It may not really be the
 706                  * newest block in the chain, but it is the newest we have
 707                  * found so far. We might update it in later iterations of
 708                  * this loop if we find something newer.
 709                  */
 710                 s->VUtable[first_logical_block] = first_block;
 711                 logical_block = BLOCK_NIL;
 712         }
 713
 714 #ifdef CONFIG_MTD_DEBUG_VERBOSE
 715         if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
 716                 INFTL_dumptables(s);
 717 #endif
 718
 719         /*
 720          * Second pass, check for infinite loops in chains. These are
 721          * possible because we don't update the previous pointers when
 722          * we fold chains. No big deal, just fix them up in PUtable.
 723          */
 724         DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 2, validate virtual chains\n");
 725         for (logical_block = 0; logical_block < s->numvunits; logical_block++) {
 726                 block = s->VUtable[logical_block];
 727                 last_block = BLOCK_NIL;
 728
 729                 /* Check for free/reserved/nil */
 730                 if (block >= BLOCK_RESERVED)
 731                         continue;
 732
 733                 ANAC = ANACtable[block];
 734                 for (i = 0; i < s->numvunits; i++) {
 735                         if (s->PUtable[block] == BLOCK_NIL)
 736                                 break;
 737                         if (s->PUtable[block] > s->lastEUN) {
 738                                 printk(KERN_WARNING "INFTL: invalid prev %d, "
 739                                         "in virtual chain %d\n",
 740                                         s->PUtable[block], logical_block);
 741                                 s->PUtable[block] = BLOCK_NIL;
 742
 743                         }
 744                         if (ANACtable[block] != ANAC) {
 745                                 /*
 746                                  * Chain must point back to itself. This is ok,
 747                                  * but we will need adjust the tables with this
 748                                  * newest block and oldest block.
 749                                  */
 750                                 s->VUtable[logical_block] = block;
 751                                 s->PUtable[last_block] = BLOCK_NIL;
 752                                 break;
 753                         }
 754
 755                         ANAC--;
 756                         last_block = block;
 757                         block = s->PUtable[block];
 758                 }
 759
 760                 if (i >= s->nb_blocks) {
 761                         /*
 762                          * Uhoo, infinite chain with valid ANACS!
 763                          * Format whole chain...
 764                          */
 765                         format_chain(s, first_block);
 766                 }
 767         }
 768
 769 #ifdef CONFIG_MTD_DEBUG_VERBOSE
 770         if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
 771                 INFTL_dumptables(s);
 772         if (CONFIG_MTD_DEBUG_VERBOSE >= 2)
 773                 INFTL_dumpVUchains(s);
 774 #endif
 775
 776         /*
 777          * Third pass, format unreferenced blocks and init free block count.
 778          */
 779         s->numfreeEUNs = 0;
 780         s->LastFreeEUN = BLOCK_NIL;
 781
 782         DEBUG(MTD_DEBUG_LEVEL3, "INFTL: pass 3, format unused blocks\n");
 783         for (block = s->firstEUN; block <= s->lastEUN; block++) {
 784                 if (s->PUtable[block] == BLOCK_NOTEXPLORED) {
 785                         printk("INFTL: unreferenced block %d, formatting it\n",
 786                                 block);
 787                         if (INFTL_formatblock(s, block) < 0)
 788                                 s->PUtable[block] = BLOCK_RESERVED;
 789                         else
 790                                 s->PUtable[block] = BLOCK_FREE;
 791                 }
 792                 if (s->PUtable[block] == BLOCK_FREE) {
 793                         s->numfreeEUNs++;
 794                         if (s->LastFreeEUN == BLOCK_NIL)
 795                                 s->LastFreeEUN = block;
 796                 }
 797         }
 798
 799         kfree(ANACtable);
 800         return 0;
 801 }