disk/part.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2001
   4  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   5  */
   6
   7 #include <common.h>
   8 #include <blk.h>
   9 #include <command.h>
  10 #include <env.h>
  11 #include <errno.h>
  12 #include <ide.h>
  13 #include <log.h>
  14 #include <malloc.h>
  15 #include <part.h>
  16 #include <ubifs_uboot.h>
  17
  18 #undef  PART_DEBUG
  19
  20 #ifdef  PART_DEBUG
  21 #define PRINTF(fmt,args...)     printf (fmt ,##args)
  22 #else
  23 #define PRINTF(fmt,args...)
  24 #endif
  25
  26 /* Check all partition types */
  27 #define PART_TYPE_ALL           -1
  28
  29 static struct part_driver *part_driver_lookup_type(struct blk_desc *dev_desc)
  30 {
  31         struct part_driver *drv =
  32                 ll_entry_start(struct part_driver, part_driver);
  33         const int n_ents = ll_entry_count(struct part_driver, part_driver);
  34         struct part_driver *entry;
  35
  36         if (dev_desc->part_type == PART_TYPE_UNKNOWN) {
  37                 for (entry = drv; entry != drv + n_ents; entry++) {
  38                         int ret;
  39
  40                         ret = entry->test(dev_desc);
  41                         if (!ret) {
  42                                 dev_desc->part_type = entry->part_type;
  43                                 return entry;
  44                         }
  45                 }
  46         } else {
  47                 for (entry = drv; entry != drv + n_ents; entry++) {
  48                         if (dev_desc->part_type == entry->part_type)
  49                                 return entry;
  50                 }
  51         }
  52
  53         /* Not found */
  54         return NULL;
  55 }
  56
  57 #ifdef CONFIG_HAVE_BLOCK_DEVICE
  58 static struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
  59 {
  60         struct blk_desc *dev_desc;
  61         int ret;
  62
  63         dev_desc = blk_get_devnum_by_typename(ifname, dev);
  64         if (!dev_desc) {
  65                 debug("%s: No device for iface '%s', dev %d\n", __func__,
  66                       ifname, dev);
  67                 return NULL;
  68         }
  69         ret = blk_dselect_hwpart(dev_desc, hwpart);
  70         if (ret) {
  71                 debug("%s: Failed to select h/w partition: err-%d\n", __func__,
  72                       ret);
  73                 return NULL;
  74         }
  75
  76         return dev_desc;
  77 }
  78
  79 struct blk_desc *blk_get_dev(const char *ifname, int dev)
  80 {
  81         return get_dev_hwpart(ifname, dev, 0);
  82 }
  83 #else
  84 struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
  85 {
  86         return NULL;
  87 }
  88
  89 struct blk_desc *blk_get_dev(const char *ifname, int dev)
  90 {
  91         return NULL;
  92 }
  93 #endif
  94
  95 #ifdef CONFIG_HAVE_BLOCK_DEVICE
  96
  97 /* ------------------------------------------------------------------------- */
  98 /*
  99  * reports device info to the user
 100  */
 101
 102 #ifdef CONFIG_LBA48
 103 typedef uint64_t lba512_t;
 104 #else
 105 typedef lbaint_t lba512_t;
 106 #endif
 107
 108 /*
 109  * Overflowless variant of (block_count * mul_by / 2**right_shift)
 110  * when 2**right_shift > mul_by
 111  */
 112 static lba512_t lba512_muldiv(lba512_t block_count, lba512_t mul_by,
 113                               int right_shift)
 114 {
 115         lba512_t bc_quot, bc_rem;
 116
 117         /* x * m / d == x / d * m + (x % d) * m / d */
 118         bc_quot = block_count >> right_shift;
 119         bc_rem  = block_count - (bc_quot << right_shift);
 120         return bc_quot * mul_by + ((bc_rem * mul_by) >> right_shift);
 121 }
 122
 123 void dev_print (struct blk_desc *dev_desc)
 124 {
 125         lba512_t lba512; /* number of blocks if 512bytes block size */
 126
 127         if (dev_desc->type == DEV_TYPE_UNKNOWN) {
 128                 puts ("not available\n");
 129                 return;
 130         }
 131
 132         switch (dev_desc->if_type) {
 133         case IF_TYPE_SCSI:
 134                 printf ("(%d:%d) Vendor: %s Prod.: %s Rev: %s\n",
 135                         dev_desc->target,dev_desc->lun,
 136                         dev_desc->vendor,
 137                         dev_desc->product,
 138                         dev_desc->revision);
 139                 break;
 140         case IF_TYPE_ATAPI:
 141         case IF_TYPE_IDE:
 142         case IF_TYPE_SATA:
 143                 printf ("Model: %s Firm: %s Ser#: %s\n",
 144                         dev_desc->vendor,
 145                         dev_desc->revision,
 146                         dev_desc->product);
 147                 break;
 148         case IF_TYPE_SD:
 149         case IF_TYPE_MMC:
 150         case IF_TYPE_USB:
 151         case IF_TYPE_NVME:
 152         case IF_TYPE_PVBLOCK:
 153                 printf ("Vendor: %s Rev: %s Prod: %s\n",
 154                         dev_desc->vendor,
 155                         dev_desc->revision,
 156                         dev_desc->product);
 157                 break;
 158         case IF_TYPE_VIRTIO:
 159                 printf("%s VirtIO Block Device\n", dev_desc->vendor);
 160                 break;
 161         case IF_TYPE_DOC:
 162                 puts("device type DOC\n");
 163                 return;
 164         case IF_TYPE_UNKNOWN:
 165                 puts("device type unknown\n");
 166                 return;
 167         default:
 168                 printf("Unhandled device type: %i\n", dev_desc->if_type);
 169                 return;
 170         }
 171         puts ("            Type: ");
 172         if (dev_desc->removable)
 173                 puts ("Removable ");
 174         switch (dev_desc->type & 0x1F) {
 175         case DEV_TYPE_HARDDISK:
 176                 puts ("Hard Disk");
 177                 break;
 178         case DEV_TYPE_CDROM:
 179                 puts ("CD ROM");
 180                 break;
 181         case DEV_TYPE_OPDISK:
 182                 puts ("Optical Device");
 183                 break;
 184         case DEV_TYPE_TAPE:
 185                 puts ("Tape");
 186                 break;
 187         default:
 188                 printf ("# %02X #", dev_desc->type & 0x1F);
 189                 break;
 190         }
 191         puts ("\n");
 192         if (dev_desc->lba > 0L && dev_desc->blksz > 0L) {
 193                 ulong mb, mb_quot, mb_rem, gb, gb_quot, gb_rem;
 194                 lbaint_t lba;
 195
 196                 lba = dev_desc->lba;
 197
 198                 lba512 = (lba * (dev_desc->blksz/512));
 199                 /* round to 1 digit */
 200                 /* 2048 = (1024 * 1024) / 512 MB */
 201                 mb = lba512_muldiv(lba512, 10, 11);
 202
 203                 mb_quot = mb / 10;
 204                 mb_rem  = mb - (10 * mb_quot);
 205
 206                 gb = mb / 1024;
 207                 gb_quot = gb / 10;
 208                 gb_rem  = gb - (10 * gb_quot);
 209 #ifdef CONFIG_LBA48
 210                 if (dev_desc->lba48)
 211                         printf ("            Supports 48-bit addressing\n");
 212 #endif
 213 #if defined(CONFIG_SYS_64BIT_LBA)
 214                 printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%llu x %lu)\n",
 215                         mb_quot, mb_rem,
 216                         gb_quot, gb_rem,
 217                         lba,
 218                         dev_desc->blksz);
 219 #else
 220                 printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%lu x %lu)\n",
 221                         mb_quot, mb_rem,
 222                         gb_quot, gb_rem,
 223                         (ulong)lba,
 224                         dev_desc->blksz);
 225 #endif
 226         } else {
 227                 puts ("            Capacity: not available\n");
 228         }
 229 }
 230 #endif
 231
 232 #ifdef CONFIG_HAVE_BLOCK_DEVICE
 233
 234 void part_init(struct blk_desc *dev_desc)
 235 {
 236         struct part_driver *drv =
 237                 ll_entry_start(struct part_driver, part_driver);
 238         const int n_ents = ll_entry_count(struct part_driver, part_driver);
 239         struct part_driver *entry;
 240
 241         blkcache_invalidate(dev_desc->if_type, dev_desc->devnum);
 242
 243         dev_desc->part_type = PART_TYPE_UNKNOWN;
 244         for (entry = drv; entry != drv + n_ents; entry++) {
 245                 int ret;
 246
 247                 ret = entry->test(dev_desc);
 248                 debug("%s: try '%s': ret=%d\n", __func__, entry->name, ret);
 249                 if (!ret) {
 250                         dev_desc->part_type = entry->part_type;
 251                         break;
 252                 }
 253         }
 254 }
 255
 256 static void print_part_header(const char *type, struct blk_desc *dev_desc)
 257 {
 258 #if CONFIG_IS_ENABLED(MAC_PARTITION) || \
 259         CONFIG_IS_ENABLED(DOS_PARTITION) || \
 260         CONFIG_IS_ENABLED(ISO_PARTITION) || \
 261         CONFIG_IS_ENABLED(AMIGA_PARTITION) || \
 262         CONFIG_IS_ENABLED(EFI_PARTITION)
 263         puts ("\nPartition Map for ");
 264         switch (dev_desc->if_type) {
 265         case IF_TYPE_IDE:
 266                 puts ("IDE");
 267                 break;
 268         case IF_TYPE_SATA:
 269                 puts ("SATA");
 270                 break;
 271         case IF_TYPE_SCSI:
 272                 puts ("SCSI");
 273                 break;
 274         case IF_TYPE_ATAPI:
 275                 puts ("ATAPI");
 276                 break;
 277         case IF_TYPE_USB:
 278                 puts ("USB");
 279                 break;
 280         case IF_TYPE_DOC:
 281                 puts ("DOC");
 282                 break;
 283         case IF_TYPE_MMC:
 284                 puts ("MMC");
 285                 break;
 286         case IF_TYPE_HOST:
 287                 puts ("HOST");
 288                 break;
 289         case IF_TYPE_NVME:
 290                 puts ("NVMe");
 291                 break;
 292         case IF_TYPE_PVBLOCK:
 293                 puts("PV BLOCK");
 294                 break;
 295         case IF_TYPE_VIRTIO:
 296                 puts("VirtIO");
 297                 break;
 298         default:
 299                 puts ("UNKNOWN");
 300                 break;
 301         }
 302         printf (" device %d  --   Partition Type: %s\n\n",
 303                         dev_desc->devnum, type);
 304 #endif /* any CONFIG_..._PARTITION */
 305 }
 306
 307 void part_print(struct blk_desc *dev_desc)
 308 {
 309         struct part_driver *drv;
 310
 311         drv = part_driver_lookup_type(dev_desc);
 312         if (!drv) {
 313                 printf("## Unknown partition table type %x\n",
 314                        dev_desc->part_type);
 315                 return;
 316         }
 317
 318         PRINTF("## Testing for valid %s partition ##\n", drv->name);
 319         print_part_header(drv->name, dev_desc);
 320         if (drv->print)
 321                 drv->print(dev_desc);
 322 }
 323
 324 #endif /* CONFIG_HAVE_BLOCK_DEVICE */
 325
 326 int part_get_info(struct blk_desc *dev_desc, int part,
 327                        struct disk_partition *info)
 328 {
 329 #ifdef CONFIG_HAVE_BLOCK_DEVICE
 330         struct part_driver *drv;
 331
 332 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 333         /* The common case is no UUID support */
 334         info->uuid[0] = 0;
 335 #endif
 336 #ifdef CONFIG_PARTITION_TYPE_GUID
 337         info->type_guid[0] = 0;
 338 #endif
 339
 340         drv = part_driver_lookup_type(dev_desc);
 341         if (!drv) {
 342                 debug("## Unknown partition table type %x\n",
 343                       dev_desc->part_type);
 344                 return -EPROTONOSUPPORT;
 345         }
 346         if (!drv->get_info) {
 347                 PRINTF("## Driver %s does not have the get_info() method\n",
 348                        drv->name);
 349                 return -ENOSYS;
 350         }
 351         if (drv->get_info(dev_desc, part, info) == 0) {
 352                 PRINTF("## Valid %s partition found ##\n", drv->name);
 353                 return 0;
 354         }
 355 #endif /* CONFIG_HAVE_BLOCK_DEVICE */
 356
 357         return -1;
 358 }
 359
 360 int part_get_info_whole_disk(struct blk_desc *dev_desc,
 361                              struct disk_partition *info)
 362 {
 363         info->start = 0;
 364         info->size = dev_desc->lba;
 365         info->blksz = dev_desc->blksz;
 366         info->bootable = 0;
 367         strcpy((char *)info->type, BOOT_PART_TYPE);
 368         strcpy((char *)info->name, "Whole Disk");
 369 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 370         info->uuid[0] = 0;
 371 #endif
 372 #ifdef CONFIG_PARTITION_TYPE_GUID
 373         info->type_guid[0] = 0;
 374 #endif
 375
 376         return 0;
 377 }
 378
 379 int blk_get_device_by_str(const char *ifname, const char *dev_hwpart_str,
 380                           struct blk_desc **dev_desc)
 381 {
 382         char *ep;
 383         char *dup_str = NULL;
 384         const char *dev_str, *hwpart_str;
 385         int dev, hwpart;
 386
 387         hwpart_str = strchr(dev_hwpart_str, '.');
 388         if (hwpart_str) {
 389                 dup_str = strdup(dev_hwpart_str);
 390                 dup_str[hwpart_str - dev_hwpart_str] = 0;
 391                 dev_str = dup_str;
 392                 hwpart_str++;
 393         } else {
 394                 dev_str = dev_hwpart_str;
 395                 hwpart = 0;
 396         }
 397
 398         dev = simple_strtoul(dev_str, &ep, 16);
 399         if (*ep) {
 400                 printf("** Bad device specification %s %s **\n",
 401                        ifname, dev_str);
 402                 dev = -EINVAL;
 403                 goto cleanup;
 404         }
 405
 406         if (hwpart_str) {
 407                 hwpart = simple_strtoul(hwpart_str, &ep, 16);
 408                 if (*ep) {
 409                         printf("** Bad HW partition specification %s %s **\n",
 410                             ifname, hwpart_str);
 411                         dev = -EINVAL;
 412                         goto cleanup;
 413                 }
 414         }
 415
 416         *dev_desc = get_dev_hwpart(ifname, dev, hwpart);
 417         if (!(*dev_desc) || ((*dev_desc)->type == DEV_TYPE_UNKNOWN)) {
 418                 debug("** Bad device %s %s **\n", ifname, dev_hwpart_str);
 419                 dev = -ENOENT;
 420                 goto cleanup;
 421         }
 422
 423 #ifdef CONFIG_HAVE_BLOCK_DEVICE
 424         /*
 425          * Updates the partition table for the specified hw partition.
 426          * Always should be done, otherwise hw partition 0 will return stale
 427          * data after displaying a non-zero hw partition.
 428          */
 429         part_init(*dev_desc);
 430 #endif
 431
 432 cleanup:
 433         free(dup_str);
 434         return dev;
 435 }
 436
 437 #define PART_UNSPECIFIED -2
 438 #define PART_AUTO -1
 439 int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
 440                              struct blk_desc **dev_desc,
 441                              struct disk_partition *info, int allow_whole_dev)
 442 {
 443         int ret = -1;
 444         const char *part_str;
 445         char *dup_str = NULL;
 446         const char *dev_str;
 447         int dev;
 448         char *ep;
 449         int p;
 450         int part;
 451         struct disk_partition tmpinfo;
 452
 453 #ifdef CONFIG_SANDBOX
 454         /*
 455          * Special-case a pseudo block device "hostfs", to allow access to the
 456          * host's own filesystem.
 457          */
 458         if (0 == strcmp(ifname, "hostfs")) {
 459                 *dev_desc = NULL;
 460                 info->start = 0;
 461                 info->size = 0;
 462                 info->blksz = 0;
 463                 info->bootable = 0;
 464                 strcpy((char *)info->type, BOOT_PART_TYPE);
 465                 strcpy((char *)info->name, "Sandbox host");
 466 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 467                 info->uuid[0] = 0;
 468 #endif
 469 #ifdef CONFIG_PARTITION_TYPE_GUID
 470                 info->type_guid[0] = 0;
 471 #endif
 472
 473                 return 0;
 474         }
 475 #endif
 476
 477 #ifdef CONFIG_CMD_UBIFS
 478         /*
 479          * Special-case ubi, ubi goes through a mtd, rather than through
 480          * a regular block device.
 481          */
 482         if (0 == strcmp(ifname, "ubi")) {
 483                 if (!ubifs_is_mounted()) {
 484                         printf("UBIFS not mounted, use ubifsmount to mount volume first!\n");
 485                         return -1;
 486                 }
 487
 488                 *dev_desc = NULL;
 489                 memset(info, 0, sizeof(*info));
 490                 strcpy((char *)info->type, BOOT_PART_TYPE);
 491                 strcpy((char *)info->name, "UBI");
 492 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 493                 info->uuid[0] = 0;
 494 #endif
 495                 return 0;
 496         }
 497 #endif
 498
 499         /* If no dev_part_str, use bootdevice environment variable */
 500         if (!dev_part_str || !strlen(dev_part_str) ||
 501             !strcmp(dev_part_str, "-"))
 502                 dev_part_str = env_get("bootdevice");
 503
 504         /* If still no dev_part_str, it's an error */
 505         if (!dev_part_str) {
 506                 printf("** No device specified **\n");
 507                 goto cleanup;
 508         }
 509
 510         /* Separate device and partition ID specification */
 511         part_str = strchr(dev_part_str, ':');
 512         if (part_str) {
 513                 dup_str = strdup(dev_part_str);
 514                 dup_str[part_str - dev_part_str] = 0;
 515                 dev_str = dup_str;
 516                 part_str++;
 517         } else {
 518                 dev_str = dev_part_str;
 519         }
 520
 521         /* Look up the device */
 522         dev = blk_get_device_by_str(ifname, dev_str, dev_desc);
 523         if (dev < 0)
 524                 goto cleanup;
 525
 526         /* Convert partition ID string to number */
 527         if (!part_str || !*part_str) {
 528                 part = PART_UNSPECIFIED;
 529         } else if (!strcmp(part_str, "auto")) {
 530                 part = PART_AUTO;
 531         } else {
 532                 /* Something specified -> use exactly that */
 533                 part = (int)simple_strtoul(part_str, &ep, 16);
 534                 /*
 535                  * Less than whole string converted,
 536                  * or request for whole device, but caller requires partition.
 537                  */
 538                 if (*ep || (part == 0 && !allow_whole_dev)) {
 539                         printf("** Bad partition specification %s %s **\n",
 540                             ifname, dev_part_str);
 541                         goto cleanup;
 542                 }
 543         }
 544
 545         /*
 546          * No partition table on device,
 547          * or user requested partition 0 (entire device).
 548          */
 549         if (((*dev_desc)->part_type == PART_TYPE_UNKNOWN) ||
 550             (part == 0)) {
 551                 if (!(*dev_desc)->lba) {
 552                         printf("** Bad device size - %s %s **\n", ifname,
 553                                dev_str);
 554                         goto cleanup;
 555                 }
 556
 557                 /*
 558                  * If user specified a partition ID other than 0,
 559                  * or the calling command only accepts partitions,
 560                  * it's an error.
 561                  */
 562                 if ((part > 0) || (!allow_whole_dev)) {
 563                         printf("** No partition table - %s %s **\n", ifname,
 564                                dev_str);
 565                         goto cleanup;
 566                 }
 567
 568                 (*dev_desc)->log2blksz = LOG2((*dev_desc)->blksz);
 569
 570                 part_get_info_whole_disk(*dev_desc, info);
 571
 572                 ret = 0;
 573                 goto cleanup;
 574         }
 575
 576         /*
 577          * Now there's known to be a partition table,
 578          * not specifying a partition means to pick partition 1.
 579          */
 580         if (part == PART_UNSPECIFIED)
 581                 part = 1;
 582
 583         /*
 584          * If user didn't specify a partition number, or did specify something
 585          * other than "auto", use that partition number directly.
 586          */
 587         if (part != PART_AUTO) {
 588                 ret = part_get_info(*dev_desc, part, info);
 589                 if (ret) {
 590                         printf("** Invalid partition %d **\n", part);
 591                         goto cleanup;
 592                 }
 593         } else {
 594                 /*
 595                  * Find the first bootable partition.
 596                  * If none are bootable, fall back to the first valid partition.
 597                  */
 598                 part = 0;
 599                 for (p = 1; p <= MAX_SEARCH_PARTITIONS; p++) {
 600                         ret = part_get_info(*dev_desc, p, info);
 601                         if (ret)
 602                                 continue;
 603
 604                         /*
 605                          * First valid partition, or new better partition?
 606                          * If so, save partition ID.
 607                          */
 608                         if (!part || info->bootable)
 609                                 part = p;
 610
 611                         /* Best possible partition? Stop searching. */
 612                         if (info->bootable)
 613                                 break;
 614
 615                         /*
 616                          * We now need to search further for best possible.
 617                          * If we what we just queried was the best so far,
 618                          * save the info since we over-write it next loop.
 619                          */
 620                         if (part == p)
 621                                 tmpinfo = *info;
 622                 }
 623                 /* If we found any acceptable partition */
 624                 if (part) {
 625                         /*
 626                          * If we searched all possible partition IDs,
 627                          * return the first valid partition we found.
 628                          */
 629                         if (p == MAX_SEARCH_PARTITIONS + 1)
 630                                 *info = tmpinfo;
 631                 } else {
 632                         printf("** No valid partitions found **\n");
 633                         ret = -1;
 634                         goto cleanup;
 635                 }
 636         }
 637         if (strncmp((char *)info->type, BOOT_PART_TYPE, sizeof(info->type)) != 0) {
 638                 printf("** Invalid partition type \"%.32s\""
 639                         " (expect \"" BOOT_PART_TYPE "\")\n",
 640                         info->type);
 641                 ret  = -1;
 642                 goto cleanup;
 643         }
 644
 645         (*dev_desc)->log2blksz = LOG2((*dev_desc)->blksz);
 646
 647         ret = part;
 648         goto cleanup;
 649
 650 cleanup:
 651         free(dup_str);
 652         return ret;
 653 }
 654
 655 int part_get_info_by_name_type(struct blk_desc *dev_desc, const char *name,
 656                                struct disk_partition *info, int part_type)
 657 {
 658         struct part_driver *part_drv;
 659         int ret;
 660         int i;
 661
 662         part_drv = part_driver_lookup_type(dev_desc);
 663         if (!part_drv)
 664                 return -1;
 665         for (i = 1; i < part_drv->max_entries; i++) {
 666                 ret = part_drv->get_info(dev_desc, i, info);
 667                 if (ret != 0) {
 668                         /* no more entries in table */
 669                         break;
 670                 }
 671                 if (strcmp(name, (const char *)info->name) == 0) {
 672                         /* matched */
 673                         return i;
 674                 }
 675         }
 676
 677         return -1;
 678 }
 679
 680 int part_get_info_by_name(struct blk_desc *dev_desc, const char *name,
 681                           struct disk_partition *info)
 682 {
 683         return part_get_info_by_name_type(dev_desc, name, info, PART_TYPE_ALL);
 684 }
 685
 686 /**
 687  * Get partition info from device number and partition name.
 688  *
 689  * Parse a device number and partition name string in the form of
 690  * "device_num#partition_name", for example "0#misc". If the partition
 691  * is found, sets dev_desc and part_info accordingly with the information
 692  * of the partition with the given partition_name.
 693  *
 694  * @param[in] dev_iface Device interface
 695  * @param[in] dev_part_str Input string argument, like "0#misc"
 696  * @param[out] dev_desc Place to store the device description pointer
 697  * @param[out] part_info Place to store the partition information
 698  * @return 0 on success, or a negative on error
 699  */
 700 static int part_get_info_by_dev_and_name(const char *dev_iface,
 701                                          const char *dev_part_str,
 702                                          struct blk_desc **dev_desc,
 703                                          struct disk_partition *part_info)
 704 {
 705         char *ep;
 706         const char *part_str;
 707         int dev_num;
 708
 709         part_str = strchr(dev_part_str, '#');
 710         if (!part_str || part_str == dev_part_str)
 711                 return -EINVAL;
 712
 713         dev_num = simple_strtoul(dev_part_str, &ep, 16);
 714         if (ep != part_str) {
 715                 /* Not all the first part before the # was parsed. */
 716                 return -EINVAL;
 717         }
 718         part_str++;
 719
 720         *dev_desc = blk_get_dev(dev_iface, dev_num);
 721         if (!*dev_desc) {
 722                 printf("Could not find %s %d\n", dev_iface, dev_num);
 723                 return -EINVAL;
 724         }
 725         if (part_get_info_by_name(*dev_desc, part_str, part_info) < 0) {
 726                 printf("Could not find \"%s\" partition\n", part_str);
 727                 return -EINVAL;
 728         }
 729         return 0;
 730 }
 731
 732 int part_get_info_by_dev_and_name_or_num(const char *dev_iface,
 733                                          const char *dev_part_str,
 734                                          struct blk_desc **dev_desc,
 735                                          struct disk_partition *part_info)
 736 {
 737         /* Split the part_name if passed as "$dev_num#part_name". */
 738         if (!part_get_info_by_dev_and_name(dev_iface, dev_part_str,
 739                                            dev_desc, part_info))
 740                 return 0;
 741         /*
 742          * Couldn't lookup by name, try looking up the partition description
 743          * directly.
 744          */
 745         if (blk_get_device_part_str(dev_iface, dev_part_str,
 746                                     dev_desc, part_info, 1) < 0) {
 747                 printf("Couldn't find partition %s %s\n",
 748                        dev_iface, dev_part_str);
 749                 return -EINVAL;
 750         }
 751         return 0;
 752 }
 753
 754 void part_set_generic_name(const struct blk_desc *dev_desc,
 755         int part_num, char *name)
 756 {
 757         char *devtype;
 758
 759         switch (dev_desc->if_type) {
 760         case IF_TYPE_IDE:
 761         case IF_TYPE_SATA:
 762         case IF_TYPE_ATAPI:
 763                 devtype = "hd";
 764                 break;
 765         case IF_TYPE_SCSI:
 766                 devtype = "sd";
 767                 break;
 768         case IF_TYPE_USB:
 769                 devtype = "usbd";
 770                 break;
 771         case IF_TYPE_DOC:
 772                 devtype = "docd";
 773                 break;
 774         case IF_TYPE_MMC:
 775         case IF_TYPE_SD:
 776                 devtype = "mmcsd";
 777                 break;
 778         default:
 779                 devtype = "xx";
 780                 break;
 781         }
 782
 783         sprintf(name, "%s%c%d", devtype, 'a' + dev_desc->devnum, part_num);
 784 }