drivers/mtd/rfd_ftl.c

   1 /*
   2  * rfd_ftl.c -- resident flash disk (flash translation layer)
   3  *
   4  * Copyright © 2005  Sean Young <sean@mess.org>
   5  *
   6  * This type of flash translation layer (FTL) is used by the Embedded BIOS
   7  * by General Software. It is known as the Resident Flash Disk (RFD), see:
   8  *
   9  *      http://www.gensw.com/pages/prod/bios/rfd.htm
  10  *
  11  * based on ftl.c
  12  */
  13
  14 #include <linux/hdreg.h>
  15 #include <linux/init.h>
  16 #include <linux/mtd/blktrans.h>
  17 #include <linux/mtd/mtd.h>
  18 #include <linux/vmalloc.h>
  19 #include <linux/slab.h>
  20 #include <linux/jiffies.h>
  21 #include <linux/module.h>
  22
  23 #include <asm/types.h>
  24
  25 static int block_size = 0;
  26 module_param(block_size, int, 0);
  27 MODULE_PARM_DESC(block_size, "Block size to use by RFD, defaults to erase unit size");
  28
  29 #define PREFIX "rfd_ftl: "
  30
  31 /* This major has been assigned by device@lanana.org */
  32 #ifndef RFD_FTL_MAJOR
  33 #define RFD_FTL_MAJOR           256
  34 #endif
  35
  36 /* Maximum number of partitions in an FTL region */
  37 #define PART_BITS               4
  38
  39 /* An erase unit should start with this value */
  40 #define RFD_MAGIC               0x9193
  41
  42 /* the second value is 0xffff or 0xffc8; function unknown */
  43
  44 /* the third value is always 0xffff, ignored */
  45
  46 /* next is an array of mapping for each corresponding sector */
  47 #define HEADER_MAP_OFFSET       3
  48 #define SECTOR_DELETED          0x0000
  49 #define SECTOR_ZERO             0xfffe
  50 #define SECTOR_FREE             0xffff
  51
  52 #define SECTOR_SIZE             512
  53
  54 #define SECTORS_PER_TRACK       63
  55
  56 struct block {
  57         enum {
  58                 BLOCK_OK,
  59                 BLOCK_ERASING,
  60                 BLOCK_ERASED,
  61                 BLOCK_UNUSED,
  62                 BLOCK_FAILED
  63         } state;
  64         int free_sectors;
  65         int used_sectors;
  66         int erases;
  67         u_long offset;
  68 };
  69
  70 struct partition {
  71         struct mtd_blktrans_dev mbd;
  72
  73         u_int block_size;               /* size of erase unit */
  74         u_int total_blocks;             /* number of erase units */
  75         u_int header_sectors_per_block; /* header sectors in erase unit */
  76         u_int data_sectors_per_block;   /* data sectors in erase unit */
  77         u_int sector_count;             /* sectors in translated disk */
  78         u_int header_size;              /* bytes in header sector */
  79         int reserved_block;             /* block next up for reclaim */
  80         int current_block;              /* block to write to */
  81         u16 *header_cache;              /* cached header */
  82
  83         int is_reclaiming;
  84         int cylinders;
  85         int errors;
  86         u_long *sector_map;
  87         struct block *blocks;
  88 };
  89
  90 static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf);
  91
  92 static int build_block_map(struct partition *part, int block_no)
  93 {
  94         struct block *block = &part->blocks[block_no];
  95         int i;
  96
  97         block->offset = part->block_size * block_no;
  98
  99         if (le16_to_cpu(part->header_cache[0]) != RFD_MAGIC) {
 100                 block->state = BLOCK_UNUSED;
 101                 return -ENOENT;
 102         }
 103
 104         block->state = BLOCK_OK;
 105
 106         for (i=0; i<part->data_sectors_per_block; i++) {
 107                 u16 entry;
 108
 109                 entry = le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i]);
 110
 111                 if (entry == SECTOR_DELETED)
 112                         continue;
 113
 114                 if (entry == SECTOR_FREE) {
 115                         block->free_sectors++;
 116                         continue;
 117                 }
 118
 119                 if (entry == SECTOR_ZERO)
 120                         entry = 0;
 121
 122                 if (entry >= part->sector_count) {
 123                         printk(KERN_WARNING PREFIX
 124                                 "'%s': unit #%d: entry %d corrupt, "
 125                                 "sector %d out of range\n",
 126                                 part->mbd.mtd->name, block_no, i, entry);
 127                         continue;
 128                 }
 129
 130                 if (part->sector_map[entry] != -1) {
 131                         printk(KERN_WARNING PREFIX
 132                                 "'%s': more than one entry for sector %d\n",
 133                                 part->mbd.mtd->name, entry);
 134                         part->errors = 1;
 135                         continue;
 136                 }
 137
 138                 part->sector_map[entry] = block->offset +
 139                         (i + part->header_sectors_per_block) * SECTOR_SIZE;
 140
 141                 block->used_sectors++;
 142         }
 143
 144         if (block->free_sectors == part->data_sectors_per_block)
 145                 part->reserved_block = block_no;
 146
 147         return 0;
 148 }
 149
 150 static int scan_header(struct partition *part)
 151 {
 152         int sectors_per_block;
 153         int i, rc = -ENOMEM;
 154         int blocks_found;
 155         size_t retlen;
 156
 157         sectors_per_block = part->block_size / SECTOR_SIZE;
 158         part->total_blocks = (u32)part->mbd.mtd->size / part->block_size;
 159
 160         if (part->total_blocks < 2)
 161                 return -ENOENT;
 162
 163         /* each erase block has three bytes header, followed by the map */
 164         part->header_sectors_per_block =
 165                         ((HEADER_MAP_OFFSET + sectors_per_block) *
 166                         sizeof(u16) + SECTOR_SIZE - 1) / SECTOR_SIZE;
 167
 168         part->data_sectors_per_block = sectors_per_block -
 169                         part->header_sectors_per_block;
 170
 171         part->header_size = (HEADER_MAP_OFFSET +
 172                         part->data_sectors_per_block) * sizeof(u16);
 173
 174         part->cylinders = (part->data_sectors_per_block *
 175                         (part->total_blocks - 1) - 1) / SECTORS_PER_TRACK;
 176
 177         part->sector_count = part->cylinders * SECTORS_PER_TRACK;
 178
 179         part->current_block = -1;
 180         part->reserved_block = -1;
 181         part->is_reclaiming = 0;
 182
 183         part->header_cache = kmalloc(part->header_size, GFP_KERNEL);
 184         if (!part->header_cache)
 185                 goto err;
 186
 187         part->blocks = kcalloc(part->total_blocks, sizeof(struct block),
 188                         GFP_KERNEL);
 189         if (!part->blocks)
 190                 goto err;
 191
 192         part->sector_map = vmalloc(part->sector_count * sizeof(u_long));
 193         if (!part->sector_map) {
 194                 printk(KERN_ERR PREFIX "'%s': unable to allocate memory for "
 195                         "sector map", part->mbd.mtd->name);
 196                 goto err;
 197         }
 198
 199         for (i=0; i<part->sector_count; i++)
 200                 part->sector_map[i] = -1;
 201
 202         for (i=0, blocks_found=0; i<part->total_blocks; i++) {
 203                 rc = mtd_read(part->mbd.mtd, i * part->block_size,
 204                               part->header_size, &retlen,
 205                               (u_char *)part->header_cache);
 206
 207                 if (!rc && retlen != part->header_size)
 208                         rc = -EIO;
 209
 210                 if (rc)
 211                         goto err;
 212
 213                 if (!build_block_map(part, i))
 214                         blocks_found++;
 215         }
 216
 217         if (blocks_found == 0) {
 218                 printk(KERN_NOTICE PREFIX "no RFD magic found in '%s'\n",
 219                                 part->mbd.mtd->name);
 220                 rc = -ENOENT;
 221                 goto err;
 222         }
 223
 224         if (part->reserved_block == -1) {
 225                 printk(KERN_WARNING PREFIX "'%s': no empty erase unit found\n",
 226                                 part->mbd.mtd->name);
 227
 228                 part->errors = 1;
 229         }
 230
 231         return 0;
 232
 233 err:
 234         vfree(part->sector_map);
 235         kfree(part->header_cache);
 236         kfree(part->blocks);
 237
 238         return rc;
 239 }
 240
 241 static int rfd_ftl_readsect(struct mtd_blktrans_dev *dev, u_long sector, char *buf)
 242 {
 243         struct partition *part = (struct partition*)dev;
 244         u_long addr;
 245         size_t retlen;
 246         int rc;
 247
 248         if (sector >= part->sector_count)
 249                 return -EIO;
 250
 251         addr = part->sector_map[sector];
 252         if (addr != -1) {
 253                 rc = mtd_read(part->mbd.mtd, addr, SECTOR_SIZE, &retlen,
 254                               (u_char *)buf);
 255                 if (!rc && retlen != SECTOR_SIZE)
 256                         rc = -EIO;
 257
 258                 if (rc) {
 259                         printk(KERN_WARNING PREFIX "error reading '%s' at "
 260                                 "0x%lx\n", part->mbd.mtd->name, addr);
 261                         return rc;
 262                 }
 263         } else
 264                 memset(buf, 0, SECTOR_SIZE);
 265
 266         return 0;
 267 }
 268
 269 static int erase_block(struct partition *part, int block)
 270 {
 271         struct erase_info *erase;
 272         int rc;
 273
 274         erase = kmalloc(sizeof(struct erase_info), GFP_KERNEL);
 275         if (!erase)
 276                 return -ENOMEM;
 277
 278         erase->addr = part->blocks[block].offset;
 279         erase->len = part->block_size;
 280
 281         part->blocks[block].state = BLOCK_ERASING;
 282         part->blocks[block].free_sectors = 0;
 283
 284         rc = mtd_erase(part->mbd.mtd, erase);
 285         if (rc) {
 286                 printk(KERN_ERR PREFIX "erase of region %llx,%llx on '%s' "
 287                                 "failed\n", (unsigned long long)erase->addr,
 288                                 (unsigned long long)erase->len, part->mbd.mtd->name);
 289                 part->blocks[block].state = BLOCK_FAILED;
 290                 part->blocks[block].free_sectors = 0;
 291                 part->blocks[block].used_sectors = 0;
 292         } else {
 293                 u16 magic = cpu_to_le16(RFD_MAGIC);
 294                 size_t retlen;
 295
 296                 part->blocks[block].state = BLOCK_ERASED;
 297                 part->blocks[block].free_sectors = part->data_sectors_per_block;
 298                 part->blocks[block].used_sectors = 0;
 299                 part->blocks[block].erases++;
 300
 301                 rc = mtd_write(part->mbd.mtd, part->blocks[block].offset,
 302                                sizeof(magic), &retlen, (u_char *)&magic);
 303                 if (!rc && retlen != sizeof(magic))
 304                         rc = -EIO;
 305
 306                 if (rc) {
 307                         pr_err(PREFIX "'%s': unable to write RFD header at 0x%lx\n",
 308                                part->mbd.mtd->name, part->blocks[block].offset);
 309                         part->blocks[block].state = BLOCK_FAILED;
 310                 } else {
 311                         part->blocks[block].state = BLOCK_OK;
 312                 }
 313         }
 314
 315         kfree(erase);
 316
 317         return rc;
 318 }
 319
 320 static int move_block_contents(struct partition *part, int block_no, u_long *old_sector)
 321 {
 322         void *sector_data;
 323         u16 *map;
 324         size_t retlen;
 325         int i, rc = -ENOMEM;
 326
 327         part->is_reclaiming = 1;
 328
 329         sector_data = kmalloc(SECTOR_SIZE, GFP_KERNEL);
 330         if (!sector_data)
 331                 goto err3;
 332
 333         map = kmalloc(part->header_size, GFP_KERNEL);
 334         if (!map)
 335                 goto err2;
 336
 337         rc = mtd_read(part->mbd.mtd, part->blocks[block_no].offset,
 338                       part->header_size, &retlen, (u_char *)map);
 339
 340         if (!rc && retlen != part->header_size)
 341                 rc = -EIO;
 342
 343         if (rc) {
 344                 printk(KERN_ERR PREFIX "error reading '%s' at "
 345                         "0x%lx\n", part->mbd.mtd->name,
 346                         part->blocks[block_no].offset);
 347
 348                 goto err;
 349         }
 350
 351         for (i=0; i<part->data_sectors_per_block; i++) {
 352                 u16 entry = le16_to_cpu(map[HEADER_MAP_OFFSET + i]);
 353                 u_long addr;
 354
 355
 356                 if (entry == SECTOR_FREE || entry == SECTOR_DELETED)
 357                         continue;
 358
 359                 if (entry == SECTOR_ZERO)
 360                         entry = 0;
 361
 362                 /* already warned about and ignored in build_block_map() */
 363                 if (entry >= part->sector_count)
 364                         continue;
 365
 366                 addr = part->blocks[block_no].offset +
 367                         (i + part->header_sectors_per_block) * SECTOR_SIZE;
 368
 369                 if (*old_sector == addr) {
 370                         *old_sector = -1;
 371                         if (!part->blocks[block_no].used_sectors--) {
 372                                 rc = erase_block(part, block_no);
 373                                 break;
 374                         }
 375                         continue;
 376                 }
 377                 rc = mtd_read(part->mbd.mtd, addr, SECTOR_SIZE, &retlen,
 378                               sector_data);
 379
 380                 if (!rc && retlen != SECTOR_SIZE)
 381                         rc = -EIO;
 382
 383                 if (rc) {
 384                         printk(KERN_ERR PREFIX "'%s': Unable to "
 385                                 "read sector for relocation\n",
 386                                 part->mbd.mtd->name);
 387
 388                         goto err;
 389                 }
 390
 391                 rc = rfd_ftl_writesect((struct mtd_blktrans_dev*)part,
 392                                 entry, sector_data);
 393
 394                 if (rc)
 395                         goto err;
 396         }
 397
 398 err:
 399         kfree(map);
 400 err2:
 401         kfree(sector_data);
 402 err3:
 403         part->is_reclaiming = 0;
 404
 405         return rc;
 406 }
 407
 408 static int reclaim_block(struct partition *part, u_long *old_sector)
 409 {
 410         int block, best_block, score, old_sector_block;
 411         int rc;
 412
 413         /* we have a race if sync doesn't exist */
 414         mtd_sync(part->mbd.mtd);
 415
 416         score = 0x7fffffff; /* MAX_INT */
 417         best_block = -1;
 418         if (*old_sector != -1)
 419                 old_sector_block = *old_sector / part->block_size;
 420         else
 421                 old_sector_block = -1;
 422
 423         for (block=0; block<part->total_blocks; block++) {
 424                 int this_score;
 425
 426                 if (block == part->reserved_block)
 427                         continue;
 428
 429                 /*
 430                  * Postpone reclaiming if there is a free sector as
 431                  * more removed sectors is more efficient (have to move
 432                  * less).
 433                  */
 434                 if (part->blocks[block].free_sectors)
 435                         return 0;
 436
 437                 this_score = part->blocks[block].used_sectors;
 438
 439                 if (block == old_sector_block)
 440                         this_score--;
 441                 else {
 442                         /* no point in moving a full block */
 443                         if (part->blocks[block].used_sectors ==
 444                                         part->data_sectors_per_block)
 445                                 continue;
 446                 }
 447
 448                 this_score += part->blocks[block].erases;
 449
 450                 if (this_score < score) {
 451                         best_block = block;
 452                         score = this_score;
 453                 }
 454         }
 455
 456         if (best_block == -1)
 457                 return -ENOSPC;
 458
 459         part->current_block = -1;
 460         part->reserved_block = best_block;
 461
 462         pr_debug("reclaim_block: reclaiming block #%d with %d used "
 463                  "%d free sectors\n", best_block,
 464                  part->blocks[best_block].used_sectors,
 465                  part->blocks[best_block].free_sectors);
 466
 467         if (part->blocks[best_block].used_sectors)
 468                 rc = move_block_contents(part, best_block, old_sector);
 469         else
 470                 rc = erase_block(part, best_block);
 471
 472         return rc;
 473 }
 474
 475 /*
 476  * IMPROVE: It would be best to choose the block with the most deleted sectors,
 477  * because if we fill that one up first it'll have the most chance of having
 478  * the least live sectors at reclaim.
 479  */
 480 static int find_free_block(struct partition *part)
 481 {
 482         int block, stop;
 483
 484         block = part->current_block == -1 ?
 485                         jiffies % part->total_blocks : part->current_block;
 486         stop = block;
 487
 488         do {
 489                 if (part->blocks[block].free_sectors &&
 490                                 block != part->reserved_block)
 491                         return block;
 492
 493                 if (part->blocks[block].state == BLOCK_UNUSED)
 494                         erase_block(part, block);
 495
 496                 if (++block >= part->total_blocks)
 497                         block = 0;
 498
 499         } while (block != stop);
 500
 501         return -1;
 502 }
 503
 504 static int find_writable_block(struct partition *part, u_long *old_sector)
 505 {
 506         int rc, block;
 507         size_t retlen;
 508
 509         block = find_free_block(part);
 510
 511         if (block == -1) {
 512                 if (!part->is_reclaiming) {
 513                         rc = reclaim_block(part, old_sector);
 514                         if (rc)
 515                                 goto err;
 516
 517                         block = find_free_block(part);
 518                 }
 519
 520                 if (block == -1) {
 521                         rc = -ENOSPC;
 522                         goto err;
 523                 }
 524         }
 525
 526         rc = mtd_read(part->mbd.mtd, part->blocks[block].offset,
 527                       part->header_size, &retlen,
 528                       (u_char *)part->header_cache);
 529
 530         if (!rc && retlen != part->header_size)
 531                 rc = -EIO;
 532
 533         if (rc) {
 534                 printk(KERN_ERR PREFIX "'%s': unable to read header at "
 535                                 "0x%lx\n", part->mbd.mtd->name,
 536                                 part->blocks[block].offset);
 537                 goto err;
 538         }
 539
 540         part->current_block = block;
 541
 542 err:
 543         return rc;
 544 }
 545
 546 static int mark_sector_deleted(struct partition *part, u_long old_addr)
 547 {
 548         int block, offset, rc;
 549         u_long addr;
 550         size_t retlen;
 551         u16 del = cpu_to_le16(SECTOR_DELETED);
 552
 553         block = old_addr / part->block_size;
 554         offset = (old_addr % part->block_size) / SECTOR_SIZE -
 555                 part->header_sectors_per_block;
 556
 557         addr = part->blocks[block].offset +
 558                         (HEADER_MAP_OFFSET + offset) * sizeof(u16);
 559         rc = mtd_write(part->mbd.mtd, addr, sizeof(del), &retlen,
 560                        (u_char *)&del);
 561
 562         if (!rc && retlen != sizeof(del))
 563                 rc = -EIO;
 564
 565         if (rc) {
 566                 printk(KERN_ERR PREFIX "error writing '%s' at "
 567                         "0x%lx\n", part->mbd.mtd->name, addr);
 568                 goto err;
 569         }
 570         if (block == part->current_block)
 571                 part->header_cache[offset + HEADER_MAP_OFFSET] = del;
 572
 573         part->blocks[block].used_sectors--;
 574
 575         if (!part->blocks[block].used_sectors &&
 576             !part->blocks[block].free_sectors)
 577                 rc = erase_block(part, block);
 578
 579 err:
 580         return rc;
 581 }
 582
 583 static int find_free_sector(const struct partition *part, const struct block *block)
 584 {
 585         int i, stop;
 586
 587         i = stop = part->data_sectors_per_block - block->free_sectors;
 588
 589         do {
 590                 if (le16_to_cpu(part->header_cache[HEADER_MAP_OFFSET + i])
 591                                 == SECTOR_FREE)
 592                         return i;
 593
 594                 if (++i == part->data_sectors_per_block)
 595                         i = 0;
 596         }
 597         while(i != stop);
 598
 599         return -1;
 600 }
 601
 602 static int do_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf, ulong *old_addr)
 603 {
 604         struct partition *part = (struct partition*)dev;
 605         struct block *block;
 606         u_long addr;
 607         int i;
 608         int rc;
 609         size_t retlen;
 610         u16 entry;
 611
 612         if (part->current_block == -1 ||
 613                 !part->blocks[part->current_block].free_sectors) {
 614
 615                 rc = find_writable_block(part, old_addr);
 616                 if (rc)
 617                         goto err;
 618         }
 619
 620         block = &part->blocks[part->current_block];
 621
 622         i = find_free_sector(part, block);
 623
 624         if (i < 0) {
 625                 rc = -ENOSPC;
 626                 goto err;
 627         }
 628
 629         addr = (i + part->header_sectors_per_block) * SECTOR_SIZE +
 630                 block->offset;
 631         rc = mtd_write(part->mbd.mtd, addr, SECTOR_SIZE, &retlen,
 632                        (u_char *)buf);
 633
 634         if (!rc && retlen != SECTOR_SIZE)
 635                 rc = -EIO;
 636
 637         if (rc) {
 638                 printk(KERN_ERR PREFIX "error writing '%s' at 0x%lx\n",
 639                                 part->mbd.mtd->name, addr);
 640                 goto err;
 641         }
 642
 643         part->sector_map[sector] = addr;
 644
 645         entry = cpu_to_le16(sector == 0 ? SECTOR_ZERO : sector);
 646
 647         part->header_cache[i + HEADER_MAP_OFFSET] = entry;
 648
 649         addr = block->offset + (HEADER_MAP_OFFSET + i) * sizeof(u16);
 650         rc = mtd_write(part->mbd.mtd, addr, sizeof(entry), &retlen,
 651                        (u_char *)&entry);
 652
 653         if (!rc && retlen != sizeof(entry))
 654                 rc = -EIO;
 655
 656         if (rc) {
 657                 printk(KERN_ERR PREFIX "error writing '%s' at 0x%lx\n",
 658                                 part->mbd.mtd->name, addr);
 659                 goto err;
 660         }
 661         block->used_sectors++;
 662         block->free_sectors--;
 663
 664 err:
 665         return rc;
 666 }
 667
 668 static int rfd_ftl_writesect(struct mtd_blktrans_dev *dev, u_long sector, char *buf)
 669 {
 670         struct partition *part = (struct partition*)dev;
 671         u_long old_addr;
 672         int i;
 673         int rc = 0;
 674
 675         pr_debug("rfd_ftl_writesect(sector=0x%lx)\n", sector);
 676
 677         if (part->reserved_block == -1) {
 678                 rc = -EACCES;
 679                 goto err;
 680         }
 681
 682         if (sector >= part->sector_count) {
 683                 rc = -EIO;
 684                 goto err;
 685         }
 686
 687         old_addr = part->sector_map[sector];
 688
 689         for (i=0; i<SECTOR_SIZE; i++) {
 690                 if (!buf[i])
 691                         continue;
 692
 693                 rc = do_writesect(dev, sector, buf, &old_addr);
 694                 if (rc)
 695                         goto err;
 696                 break;
 697         }
 698
 699         if (i == SECTOR_SIZE)
 700                 part->sector_map[sector] = -1;
 701
 702         if (old_addr != -1)
 703                 rc = mark_sector_deleted(part, old_addr);
 704
 705 err:
 706         return rc;
 707 }
 708
 709 static int rfd_ftl_getgeo(struct mtd_blktrans_dev *dev, struct hd_geometry *geo)
 710 {
 711         struct partition *part = (struct partition*)dev;
 712
 713         geo->heads = 1;
 714         geo->sectors = SECTORS_PER_TRACK;
 715         geo->cylinders = part->cylinders;
 716
 717         return 0;
 718 }
 719
 720 static void rfd_ftl_add_mtd(struct mtd_blktrans_ops *tr, struct mtd_info *mtd)
 721 {
 722         struct partition *part;
 723
 724         if (mtd->type != MTD_NORFLASH || mtd->size > UINT_MAX)
 725                 return;
 726
 727         part = kzalloc(sizeof(struct partition), GFP_KERNEL);
 728         if (!part)
 729                 return;
 730
 731         part->mbd.mtd = mtd;
 732
 733         if (block_size)
 734                 part->block_size = block_size;
 735         else {
 736                 if (!mtd->erasesize) {
 737                         printk(KERN_WARNING PREFIX "please provide block_size");
 738                         goto out;
 739                 } else
 740                         part->block_size = mtd->erasesize;
 741         }
 742
 743         if (scan_header(part) == 0) {
 744                 part->mbd.size = part->sector_count;
 745                 part->mbd.tr = tr;
 746                 part->mbd.devnum = -1;
 747                 if (!(mtd->flags & MTD_WRITEABLE))
 748                         part->mbd.readonly = 1;
 749                 else if (part->errors) {
 750                         printk(KERN_WARNING PREFIX "'%s': errors found, "
 751                                         "setting read-only\n", mtd->name);
 752                         part->mbd.readonly = 1;
 753                 }
 754
 755                 printk(KERN_INFO PREFIX "name: '%s' type: %d flags %x\n",
 756                                 mtd->name, mtd->type, mtd->flags);
 757
 758                 if (!add_mtd_blktrans_dev((void*)part))
 759                         return;
 760         }
 761 out:
 762         kfree(part);
 763 }
 764
 765 static void rfd_ftl_remove_dev(struct mtd_blktrans_dev *dev)
 766 {
 767         struct partition *part = (struct partition*)dev;
 768         int i;
 769
 770         for (i=0; i<part->total_blocks; i++) {
 771                 pr_debug("rfd_ftl_remove_dev:'%s': erase unit #%02d: %d erases\n",
 772                         part->mbd.mtd->name, i, part->blocks[i].erases);
 773         }
 774
 775         del_mtd_blktrans_dev(dev);
 776         vfree(part->sector_map);
 777         kfree(part->header_cache);
 778         kfree(part->blocks);
 779 }
 780
 781 static struct mtd_blktrans_ops rfd_ftl_tr = {
 782         .name           = "rfd",
 783         .major          = RFD_FTL_MAJOR,
 784         .part_bits      = PART_BITS,
 785         .blksize        = SECTOR_SIZE,
 786
 787         .readsect       = rfd_ftl_readsect,
 788         .writesect      = rfd_ftl_writesect,
 789         .getgeo         = rfd_ftl_getgeo,
 790         .add_mtd        = rfd_ftl_add_mtd,
 791         .remove_dev     = rfd_ftl_remove_dev,
 792         .owner          = THIS_MODULE,
 793 };
 794
 795 static int __init init_rfd_ftl(void)
 796 {
 797         return register_mtd_blktrans(&rfd_ftl_tr);
 798 }
 799
 800 static void __exit cleanup_rfd_ftl(void)
 801 {
 802         deregister_mtd_blktrans(&rfd_ftl_tr);
 803 }
 804
 805 module_init(init_rfd_ftl);
 806 module_exit(cleanup_rfd_ftl);
 807
 808 MODULE_LICENSE("GPL");
 809 MODULE_AUTHOR("Sean Young <sean@mess.org>");
 810 MODULE_DESCRIPTION("Support code for RFD Flash Translation Layer, "
 811                 "used by General Software's Embedded BIOS");
 812