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 static struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
  58 {
  59         struct blk_desc *dev_desc;
  60         int ret;
  61
  62         if (!blk_enabled())
  63                 return NULL;
  64         dev_desc = blk_get_devnum_by_typename(ifname, dev);
  65         if (!dev_desc) {
  66                 debug("%s: No device for iface '%s', dev %d\n", __func__,
  67                       ifname, dev);
  68                 return NULL;
  69         }
  70         ret = blk_dselect_hwpart(dev_desc, hwpart);
  71         if (ret) {
  72                 debug("%s: Failed to select h/w partition: err-%d\n", __func__,
  73                       ret);
  74                 return NULL;
  75         }
  76
  77         return dev_desc;
  78 }
  79
  80 struct blk_desc *blk_get_dev(const char *ifname, int dev)
  81 {
  82         if (!blk_enabled())
  83                 return NULL;
  84
  85         return get_dev_hwpart(ifname, dev, 0);
  86 }
  87
  88 /* ------------------------------------------------------------------------- */
  89 /*
  90  * reports device info to the user
  91  */
  92
  93 #ifdef CONFIG_LBA48
  94 typedef uint64_t lba512_t;
  95 #else
  96 typedef lbaint_t lba512_t;
  97 #endif
  98
  99 /*
 100  * Overflowless variant of (block_count * mul_by / 2**right_shift)
 101  * when 2**right_shift > mul_by
 102  */
 103 static lba512_t lba512_muldiv(lba512_t block_count, lba512_t mul_by,
 104                               int right_shift)
 105 {
 106         lba512_t bc_quot, bc_rem;
 107
 108         /* x * m / d == x / d * m + (x % d) * m / d */
 109         bc_quot = block_count >> right_shift;
 110         bc_rem  = block_count - (bc_quot << right_shift);
 111         return bc_quot * mul_by + ((bc_rem * mul_by) >> right_shift);
 112 }
 113
 114 void dev_print (struct blk_desc *dev_desc)
 115 {
 116         lba512_t lba512; /* number of blocks if 512bytes block size */
 117
 118         if (dev_desc->type == DEV_TYPE_UNKNOWN) {
 119                 puts ("not available\n");
 120                 return;
 121         }
 122
 123         switch (dev_desc->if_type) {
 124         case IF_TYPE_SCSI:
 125                 printf ("(%d:%d) Vendor: %s Prod.: %s Rev: %s\n",
 126                         dev_desc->target,dev_desc->lun,
 127                         dev_desc->vendor,
 128                         dev_desc->product,
 129                         dev_desc->revision);
 130                 break;
 131         case IF_TYPE_ATAPI:
 132         case IF_TYPE_IDE:
 133         case IF_TYPE_SATA:
 134                 printf ("Model: %s Firm: %s Ser#: %s\n",
 135                         dev_desc->vendor,
 136                         dev_desc->revision,
 137                         dev_desc->product);
 138                 break;
 139         case IF_TYPE_SD:
 140         case IF_TYPE_MMC:
 141         case IF_TYPE_USB:
 142         case IF_TYPE_NVME:
 143         case IF_TYPE_PVBLOCK:
 144         case IF_TYPE_HOST:
 145                 printf ("Vendor: %s Rev: %s Prod: %s\n",
 146                         dev_desc->vendor,
 147                         dev_desc->revision,
 148                         dev_desc->product);
 149                 break;
 150         case IF_TYPE_VIRTIO:
 151                 printf("%s VirtIO Block Device\n", dev_desc->vendor);
 152                 break;
 153         case IF_TYPE_UNKNOWN:
 154                 puts("device type unknown\n");
 155                 return;
 156         default:
 157                 printf("Unhandled device type: %i\n", dev_desc->if_type);
 158                 return;
 159         }
 160         puts ("            Type: ");
 161         if (dev_desc->removable)
 162                 puts ("Removable ");
 163         switch (dev_desc->type & 0x1F) {
 164         case DEV_TYPE_HARDDISK:
 165                 puts ("Hard Disk");
 166                 break;
 167         case DEV_TYPE_CDROM:
 168                 puts ("CD ROM");
 169                 break;
 170         case DEV_TYPE_OPDISK:
 171                 puts ("Optical Device");
 172                 break;
 173         case DEV_TYPE_TAPE:
 174                 puts ("Tape");
 175                 break;
 176         default:
 177                 printf ("# %02X #", dev_desc->type & 0x1F);
 178                 break;
 179         }
 180         puts ("\n");
 181         if (dev_desc->lba > 0L && dev_desc->blksz > 0L) {
 182                 ulong mb, mb_quot, mb_rem, gb, gb_quot, gb_rem;
 183                 lbaint_t lba;
 184
 185                 lba = dev_desc->lba;
 186
 187                 lba512 = (lba * (dev_desc->blksz/512));
 188                 /* round to 1 digit */
 189                 /* 2048 = (1024 * 1024) / 512 MB */
 190                 mb = lba512_muldiv(lba512, 10, 11);
 191
 192                 mb_quot = mb / 10;
 193                 mb_rem  = mb - (10 * mb_quot);
 194
 195                 gb = mb / 1024;
 196                 gb_quot = gb / 10;
 197                 gb_rem  = gb - (10 * gb_quot);
 198 #ifdef CONFIG_LBA48
 199                 if (dev_desc->lba48)
 200                         printf ("            Supports 48-bit addressing\n");
 201 #endif
 202 #if defined(CONFIG_SYS_64BIT_LBA)
 203                 printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%llu x %lu)\n",
 204                         mb_quot, mb_rem,
 205                         gb_quot, gb_rem,
 206                         lba,
 207                         dev_desc->blksz);
 208 #else
 209                 printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%lu x %lu)\n",
 210                         mb_quot, mb_rem,
 211                         gb_quot, gb_rem,
 212                         (ulong)lba,
 213                         dev_desc->blksz);
 214 #endif
 215         } else {
 216                 puts ("            Capacity: not available\n");
 217         }
 218 }
 219
 220 void part_init(struct blk_desc *dev_desc)
 221 {
 222         struct part_driver *drv =
 223                 ll_entry_start(struct part_driver, part_driver);
 224         const int n_ents = ll_entry_count(struct part_driver, part_driver);
 225         struct part_driver *entry;
 226
 227         blkcache_invalidate(dev_desc->if_type, dev_desc->devnum);
 228
 229         dev_desc->part_type = PART_TYPE_UNKNOWN;
 230         for (entry = drv; entry != drv + n_ents; entry++) {
 231                 int ret;
 232
 233                 ret = entry->test(dev_desc);
 234                 debug("%s: try '%s': ret=%d\n", __func__, entry->name, ret);
 235                 if (!ret) {
 236                         dev_desc->part_type = entry->part_type;
 237                         break;
 238                 }
 239         }
 240 }
 241
 242 static void print_part_header(const char *type, struct blk_desc *dev_desc)
 243 {
 244 #if CONFIG_IS_ENABLED(MAC_PARTITION) || \
 245         CONFIG_IS_ENABLED(DOS_PARTITION) || \
 246         CONFIG_IS_ENABLED(ISO_PARTITION) || \
 247         CONFIG_IS_ENABLED(AMIGA_PARTITION) || \
 248         CONFIG_IS_ENABLED(EFI_PARTITION)
 249         puts ("\nPartition Map for ");
 250         switch (dev_desc->if_type) {
 251         case IF_TYPE_IDE:
 252                 puts ("IDE");
 253                 break;
 254         case IF_TYPE_SATA:
 255                 puts ("SATA");
 256                 break;
 257         case IF_TYPE_SCSI:
 258                 puts ("SCSI");
 259                 break;
 260         case IF_TYPE_ATAPI:
 261                 puts ("ATAPI");
 262                 break;
 263         case IF_TYPE_USB:
 264                 puts ("USB");
 265                 break;
 266         case IF_TYPE_MMC:
 267                 puts ("MMC");
 268                 break;
 269         case IF_TYPE_HOST:
 270                 puts ("HOST");
 271                 break;
 272         case IF_TYPE_NVME:
 273                 puts ("NVMe");
 274                 break;
 275         case IF_TYPE_PVBLOCK:
 276                 puts("PV BLOCK");
 277                 break;
 278         case IF_TYPE_VIRTIO:
 279                 puts("VirtIO");
 280                 break;
 281         case IF_TYPE_EFI_MEDIA:
 282                 puts("EFI");
 283                 break;
 284         default:
 285                 puts("UNKNOWN");
 286                 break;
 287         }
 288         printf (" device %d  --   Partition Type: %s\n\n",
 289                         dev_desc->devnum, type);
 290 #endif /* any CONFIG_..._PARTITION */
 291 }
 292
 293 void part_print(struct blk_desc *dev_desc)
 294 {
 295         struct part_driver *drv;
 296
 297         drv = part_driver_lookup_type(dev_desc);
 298         if (!drv) {
 299                 printf("## Unknown partition table type %x\n",
 300                        dev_desc->part_type);
 301                 return;
 302         }
 303
 304         PRINTF("## Testing for valid %s partition ##\n", drv->name);
 305         print_part_header(drv->name, dev_desc);
 306         if (drv->print)
 307                 drv->print(dev_desc);
 308 }
 309
 310 int part_get_info(struct blk_desc *dev_desc, int part,
 311                        struct disk_partition *info)
 312 {
 313         struct part_driver *drv;
 314
 315         if (blk_enabled()) {
 316 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 317                 /* The common case is no UUID support */
 318                 info->uuid[0] = 0;
 319 #endif
 320 #ifdef CONFIG_PARTITION_TYPE_GUID
 321                 info->type_guid[0] = 0;
 322 #endif
 323
 324                 drv = part_driver_lookup_type(dev_desc);
 325                 if (!drv) {
 326                         debug("## Unknown partition table type %x\n",
 327                               dev_desc->part_type);
 328                         return -EPROTONOSUPPORT;
 329                 }
 330                 if (!drv->get_info) {
 331                         PRINTF("## Driver %s does not have the get_info() method\n",
 332                                drv->name);
 333                         return -ENOSYS;
 334                 }
 335                 if (drv->get_info(dev_desc, part, info) == 0) {
 336                         PRINTF("## Valid %s partition found ##\n", drv->name);
 337                         return 0;
 338                 }
 339         }
 340
 341         return -ENOENT;
 342 }
 343
 344 int part_get_info_whole_disk(struct blk_desc *dev_desc,
 345                              struct disk_partition *info)
 346 {
 347         info->start = 0;
 348         info->size = dev_desc->lba;
 349         info->blksz = dev_desc->blksz;
 350         info->bootable = 0;
 351         strcpy((char *)info->type, BOOT_PART_TYPE);
 352         strcpy((char *)info->name, "Whole Disk");
 353 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 354         info->uuid[0] = 0;
 355 #endif
 356 #ifdef CONFIG_PARTITION_TYPE_GUID
 357         info->type_guid[0] = 0;
 358 #endif
 359
 360         return 0;
 361 }
 362
 363 int blk_get_device_by_str(const char *ifname, const char *dev_hwpart_str,
 364                           struct blk_desc **dev_desc)
 365 {
 366         char *ep;
 367         char *dup_str = NULL;
 368         const char *dev_str, *hwpart_str;
 369         int dev, hwpart;
 370
 371         hwpart_str = strchr(dev_hwpart_str, '.');
 372         if (hwpart_str) {
 373                 dup_str = strdup(dev_hwpart_str);
 374                 dup_str[hwpart_str - dev_hwpart_str] = 0;
 375                 dev_str = dup_str;
 376                 hwpart_str++;
 377         } else {
 378                 dev_str = dev_hwpart_str;
 379                 hwpart = 0;
 380         }
 381
 382         dev = hextoul(dev_str, &ep);
 383         if (*ep) {
 384                 printf("** Bad device specification %s %s **\n",
 385                        ifname, dev_str);
 386                 dev = -EINVAL;
 387                 goto cleanup;
 388         }
 389
 390         if (hwpart_str) {
 391                 hwpart = hextoul(hwpart_str, &ep);
 392                 if (*ep) {
 393                         printf("** Bad HW partition specification %s %s **\n",
 394                             ifname, hwpart_str);
 395                         dev = -EINVAL;
 396                         goto cleanup;
 397                 }
 398         }
 399
 400         *dev_desc = get_dev_hwpart(ifname, dev, hwpart);
 401         if (!(*dev_desc) || ((*dev_desc)->type == DEV_TYPE_UNKNOWN)) {
 402                 debug("** Bad device %s %s **\n", ifname, dev_hwpart_str);
 403                 dev = -ENODEV;
 404                 goto cleanup;
 405         }
 406
 407         if (blk_enabled()) {
 408                 /*
 409                  * Updates the partition table for the specified hw partition.
 410                  * Always should be done, otherwise hw partition 0 will return
 411                  * stale data after displaying a non-zero hw partition.
 412                  */
 413                 if ((*dev_desc)->if_type == IF_TYPE_MMC)
 414                         part_init(*dev_desc);
 415         }
 416
 417 cleanup:
 418         free(dup_str);
 419         return dev;
 420 }
 421
 422 #define PART_UNSPECIFIED -2
 423 #define PART_AUTO -1
 424 int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
 425                              struct blk_desc **dev_desc,
 426                              struct disk_partition *info, int allow_whole_dev)
 427 {
 428         int ret;
 429         const char *part_str;
 430         char *dup_str = NULL;
 431         const char *dev_str;
 432         int dev;
 433         char *ep;
 434         int p;
 435         int part;
 436         struct disk_partition tmpinfo;
 437
 438 #if IS_ENABLED(CONFIG_SANDBOX) || IS_ENABLED(CONFIG_SEMIHOSTING)
 439         /*
 440          * Special-case a pseudo block device "hostfs", to allow access to the
 441          * host's own filesystem.
 442          */
 443         if (0 == strcmp(ifname, "hostfs")) {
 444                 *dev_desc = NULL;
 445                 info->start = 0;
 446                 info->size = 0;
 447                 info->blksz = 0;
 448                 info->bootable = 0;
 449                 strcpy((char *)info->type, BOOT_PART_TYPE);
 450                 strcpy((char *)info->name, "Host filesystem");
 451 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 452                 info->uuid[0] = 0;
 453 #endif
 454 #ifdef CONFIG_PARTITION_TYPE_GUID
 455                 info->type_guid[0] = 0;
 456 #endif
 457
 458                 return 0;
 459         }
 460 #endif
 461
 462 #ifdef CONFIG_CMD_UBIFS
 463         /*
 464          * Special-case ubi, ubi goes through a mtd, rather than through
 465          * a regular block device.
 466          */
 467         if (0 == strcmp(ifname, "ubi")) {
 468                 if (!ubifs_is_mounted()) {
 469                         printf("UBIFS not mounted, use ubifsmount to mount volume first!\n");
 470                         return -EINVAL;
 471                 }
 472
 473                 *dev_desc = NULL;
 474                 memset(info, 0, sizeof(*info));
 475                 strcpy((char *)info->type, BOOT_PART_TYPE);
 476                 strcpy((char *)info->name, "UBI");
 477 #if CONFIG_IS_ENABLED(PARTITION_UUIDS)
 478                 info->uuid[0] = 0;
 479 #endif
 480                 return 0;
 481         }
 482 #endif
 483
 484         /* If no dev_part_str, use bootdevice environment variable */
 485         if (!dev_part_str || !strlen(dev_part_str) ||
 486             !strcmp(dev_part_str, "-"))
 487                 dev_part_str = env_get("bootdevice");
 488
 489         /* If still no dev_part_str, it's an error */
 490         if (!dev_part_str) {
 491                 printf("** No device specified **\n");
 492                 ret = -ENODEV;
 493                 goto cleanup;
 494         }
 495
 496         /* Separate device and partition ID specification */
 497         part_str = strchr(dev_part_str, ':');
 498         if (part_str) {
 499                 dup_str = strdup(dev_part_str);
 500                 dup_str[part_str - dev_part_str] = 0;
 501                 dev_str = dup_str;
 502                 part_str++;
 503         } else {
 504                 dev_str = dev_part_str;
 505         }
 506
 507         /* Look up the device */
 508         dev = blk_get_device_by_str(ifname, dev_str, dev_desc);
 509         if (dev < 0) {
 510                 printf("** Bad device specification %s %s **\n",
 511                        ifname, dev_str);
 512                 ret = dev;
 513                 goto cleanup;
 514         }
 515
 516         /* Convert partition ID string to number */
 517         if (!part_str || !*part_str) {
 518                 part = PART_UNSPECIFIED;
 519         } else if (!strcmp(part_str, "auto")) {
 520                 part = PART_AUTO;
 521         } else {
 522                 /* Something specified -> use exactly that */
 523                 part = (int)hextoul(part_str, &ep);
 524                 /*
 525                  * Less than whole string converted,
 526                  * or request for whole device, but caller requires partition.
 527                  */
 528                 if (*ep || (part == 0 && !allow_whole_dev)) {
 529                         printf("** Bad partition specification %s %s **\n",
 530                             ifname, dev_part_str);
 531                         ret = -ENOENT;
 532                         goto cleanup;
 533                 }
 534         }
 535
 536         /*
 537          * No partition table on device,
 538          * or user requested partition 0 (entire device).
 539          */
 540         if (((*dev_desc)->part_type == PART_TYPE_UNKNOWN) ||
 541             (part == 0)) {
 542                 if (!(*dev_desc)->lba) {
 543                         printf("** Bad device size - %s %s **\n", ifname,
 544                                dev_str);
 545                         ret = -EINVAL;
 546                         goto cleanup;
 547                 }
 548
 549                 /*
 550                  * If user specified a partition ID other than 0,
 551                  * or the calling command only accepts partitions,
 552                  * it's an error.
 553                  */
 554                 if ((part > 0) || (!allow_whole_dev)) {
 555                         printf("** No partition table - %s %s **\n", ifname,
 556                                dev_str);
 557                         ret = -EPROTONOSUPPORT;
 558                         goto cleanup;
 559                 }
 560
 561                 (*dev_desc)->log2blksz = LOG2((*dev_desc)->blksz);
 562
 563                 part_get_info_whole_disk(*dev_desc, info);
 564
 565                 ret = 0;
 566                 goto cleanup;
 567         }
 568
 569         /*
 570          * Now there's known to be a partition table,
 571          * not specifying a partition means to pick partition 1.
 572          */
 573         if (part == PART_UNSPECIFIED)
 574                 part = 1;
 575
 576         /*
 577          * If user didn't specify a partition number, or did specify something
 578          * other than "auto", use that partition number directly.
 579          */
 580         if (part != PART_AUTO) {
 581                 ret = part_get_info(*dev_desc, part, info);
 582                 if (ret) {
 583                         printf("** Invalid partition %d **\n", part);
 584                         goto cleanup;
 585                 }
 586         } else {
 587                 /*
 588                  * Find the first bootable partition.
 589                  * If none are bootable, fall back to the first valid partition.
 590                  */
 591                 part = 0;
 592                 for (p = 1; p <= MAX_SEARCH_PARTITIONS; p++) {
 593                         ret = part_get_info(*dev_desc, p, info);
 594                         if (ret)
 595                                 continue;
 596
 597                         /*
 598                          * First valid partition, or new better partition?
 599                          * If so, save partition ID.
 600                          */
 601                         if (!part || info->bootable)
 602                                 part = p;
 603
 604                         /* Best possible partition? Stop searching. */
 605                         if (info->bootable)
 606                                 break;
 607
 608                         /*
 609                          * We now need to search further for best possible.
 610                          * If we what we just queried was the best so far,
 611                          * save the info since we over-write it next loop.
 612                          */
 613                         if (part == p)
 614                                 tmpinfo = *info;
 615                 }
 616                 /* If we found any acceptable partition */
 617                 if (part) {
 618                         /*
 619                          * If we searched all possible partition IDs,
 620                          * return the first valid partition we found.
 621                          */
 622                         if (p == MAX_SEARCH_PARTITIONS + 1)
 623                                 *info = tmpinfo;
 624                 } else {
 625                         printf("** No valid partitions found **\n");
 626                         goto cleanup;
 627                 }
 628         }
 629         if (strncmp((char *)info->type, BOOT_PART_TYPE, sizeof(info->type)) != 0) {
 630                 printf("** Invalid partition type \"%.32s\""
 631                         " (expect \"" BOOT_PART_TYPE "\")\n",
 632                         info->type);
 633                 ret  = -EINVAL;
 634                 goto cleanup;
 635         }
 636
 637         (*dev_desc)->log2blksz = LOG2((*dev_desc)->blksz);
 638
 639         ret = part;
 640         goto cleanup;
 641
 642 cleanup:
 643         free(dup_str);
 644         return ret;
 645 }
 646
 647 int part_get_info_by_name_type(struct blk_desc *dev_desc, const char *name,
 648                                struct disk_partition *info, int part_type)
 649 {
 650         struct part_driver *part_drv;
 651         int ret;
 652         int i;
 653
 654         part_drv = part_driver_lookup_type(dev_desc);
 655         if (!part_drv)
 656                 return -1;
 657
 658         if (!part_drv->get_info) {
 659                 log_debug("## Driver %s does not have the get_info() method\n",
 660                           part_drv->name);
 661                 return -ENOSYS;
 662         }
 663
 664         for (i = 1; i < part_drv->max_entries; i++) {
 665                 ret = part_drv->get_info(dev_desc, i, info);
 666                 if (ret != 0) {
 667                         /* no more entries in table */
 668                         break;
 669                 }
 670                 if (strcmp(name, (const char *)info->name) == 0) {
 671                         /* matched */
 672                         return i;
 673                 }
 674         }
 675
 676         return -ENOENT;
 677 }
 678
 679 int part_get_info_by_name(struct blk_desc *dev_desc, const char *name,
 680                           struct disk_partition *info)
 681 {
 682         return part_get_info_by_name_type(dev_desc, name, info, PART_TYPE_ALL);
 683 }
 684
 685 /**
 686  * Get partition info from device number and partition name.
 687  *
 688  * Parse a device number and partition name string in the form of
 689  * "devicenum.hwpartnum#partition_name", for example "0.1#misc". devicenum and
 690  * hwpartnum are both optional, defaulting to 0. If the partition is found,
 691  * sets dev_desc and part_info accordingly with the information of the
 692  * partition with the given partition_name.
 693  *
 694  * @param[in] dev_iface Device interface
 695  * @param[in] dev_part_str Input string argument, like "0.1#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 *dup_str = NULL;
 706         const char *dev_str, *part_str;
 707         int ret;
 708
 709         /* Separate device and partition name specification */
 710         if (dev_part_str)
 711                 part_str = strchr(dev_part_str, '#');
 712         else
 713                 part_str = NULL;
 714
 715         if (part_str) {
 716                 dup_str = strdup(dev_part_str);
 717                 dup_str[part_str - dev_part_str] = 0;
 718                 dev_str = dup_str;
 719                 part_str++;
 720         } else {
 721                 return -EINVAL;
 722         }
 723
 724         ret = blk_get_device_by_str(dev_iface, dev_str, dev_desc);
 725         if (ret < 0)
 726                 goto cleanup;
 727
 728         ret = part_get_info_by_name(*dev_desc, part_str, part_info);
 729         if (ret < 0)
 730                 printf("Could not find \"%s\" partition\n", part_str);
 731
 732 cleanup:
 733         free(dup_str);
 734         return ret;
 735 }
 736
 737 int part_get_info_by_dev_and_name_or_num(const char *dev_iface,
 738                                          const char *dev_part_str,
 739                                          struct blk_desc **dev_desc,
 740                                          struct disk_partition *part_info,
 741                                          int allow_whole_dev)
 742 {
 743         int ret;
 744
 745         /* Split the part_name if passed as "$dev_num#part_name". */
 746         ret = part_get_info_by_dev_and_name(dev_iface, dev_part_str,
 747                                             dev_desc, part_info);
 748         if (ret >= 0)
 749                 return ret;
 750         /*
 751          * Couldn't lookup by name, try looking up the partition description
 752          * directly.
 753          */
 754         ret = blk_get_device_part_str(dev_iface, dev_part_str,
 755                                       dev_desc, part_info, allow_whole_dev);
 756         if (ret < 0)
 757                 printf("Couldn't find partition %s %s\n",
 758                        dev_iface, dev_part_str);
 759         return ret;
 760 }
 761
 762 void part_set_generic_name(const struct blk_desc *dev_desc,
 763         int part_num, char *name)
 764 {
 765         char *devtype;
 766
 767         switch (dev_desc->if_type) {
 768         case IF_TYPE_IDE:
 769         case IF_TYPE_SATA:
 770         case IF_TYPE_ATAPI:
 771                 devtype = "hd";
 772                 break;
 773         case IF_TYPE_SCSI:
 774                 devtype = "sd";
 775                 break;
 776         case IF_TYPE_USB:
 777                 devtype = "usbd";
 778                 break;
 779         case IF_TYPE_MMC:
 780         case IF_TYPE_SD:
 781                 devtype = "mmcsd";
 782                 break;
 783         default:
 784                 devtype = "xx";
 785                 break;
 786         }
 787
 788         sprintf(name, "%s%c%d", devtype, 'a' + dev_desc->devnum, part_num);
 789 }