aboutsummaryrefslogtreecommitdiff
path: root/disk/part.c
blob: f6a31025dc8a0a1a1a484105285ae060b8765b2d (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2001
 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
 */

#include <common.h>
#include <blk.h>
#include <command.h>
#include <env.h>
#include <errno.h>
#include <ide.h>
#include <log.h>
#include <malloc.h>
#include <part.h>
#include <ubifs_uboot.h>

#undef	PART_DEBUG

#ifdef	PART_DEBUG
#define	PRINTF(fmt,args...)	printf (fmt ,##args)
#else
#define PRINTF(fmt,args...)
#endif

/* Check all partition types */
#define PART_TYPE_ALL		-1

static struct part_driver *part_driver_lookup_type(struct blk_desc *dev_desc)
{
	struct part_driver *drv =
		ll_entry_start(struct part_driver, part_driver);
	const int n_ents = ll_entry_count(struct part_driver, part_driver);
	struct part_driver *entry;

	if (dev_desc->part_type == PART_TYPE_UNKNOWN) {
		for (entry = drv; entry != drv + n_ents; entry++) {
			int ret;

			ret = entry->test(dev_desc);
			if (!ret) {
				dev_desc->part_type = entry->part_type;
				return entry;
			}
		}
	} else {
		for (entry = drv; entry != drv + n_ents; entry++) {
			if (dev_desc->part_type == entry->part_type)
				return entry;
		}
	}

	/* Not found */
	return NULL;
}

#ifdef CONFIG_HAVE_BLOCK_DEVICE
static struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
{
	struct blk_desc *dev_desc;
	int ret;

	dev_desc = blk_get_devnum_by_typename(ifname, dev);
	if (!dev_desc) {
		debug("%s: No device for iface '%s', dev %d\n", __func__,
		      ifname, dev);
		return NULL;
	}
	ret = blk_dselect_hwpart(dev_desc, hwpart);
	if (ret) {
		debug("%s: Failed to select h/w partition: err-%d\n", __func__,
		      ret);
		return NULL;
	}

	return dev_desc;
}

struct blk_desc *blk_get_dev(const char *ifname, int dev)
{
	return get_dev_hwpart(ifname, dev, 0);
}
#else
struct blk_desc *get_dev_hwpart(const char *ifname, int dev, int hwpart)
{
	return NULL;
}

struct blk_desc *blk_get_dev(const char *ifname, int dev)
{
	return NULL;
}
#endif

#ifdef CONFIG_HAVE_BLOCK_DEVICE

/* ------------------------------------------------------------------------- */
/*
 * reports device info to the user
 */

#ifdef CONFIG_LBA48
typedef uint64_t lba512_t;
#else
typedef lbaint_t lba512_t;
#endif

/*
 * Overflowless variant of (block_count * mul_by / 2**right_shift)
 * when 2**right_shift > mul_by
 */
static lba512_t lba512_muldiv(lba512_t block_count, lba512_t mul_by,
			      int right_shift)
{
	lba512_t bc_quot, bc_rem;

	/* x * m / d == x / d * m + (x % d) * m / d */
	bc_quot = block_count >> right_shift;
	bc_rem  = block_count - (bc_quot << right_shift);
	return bc_quot * mul_by + ((bc_rem * mul_by) >> right_shift);
}

void dev_print (struct blk_desc *dev_desc)
{
	lba512_t lba512; /* number of blocks if 512bytes block size */

	if (dev_desc->type == DEV_TYPE_UNKNOWN) {
		puts ("not available\n");
		return;
	}

	switch (dev_desc->if_type) {
	case IF_TYPE_SCSI:
		printf ("(%d:%d) Vendor: %s Prod.: %s Rev: %s\n",
			dev_desc->target,dev_desc->lun,
			dev_desc->vendor,
			dev_desc->product,
			dev_desc->revision);
		break;
	case IF_TYPE_ATAPI:
	case IF_TYPE_IDE:
	case IF_TYPE_SATA:
		printf ("Model: %s Firm: %s Ser#: %s\n",
			dev_desc->vendor,
			dev_desc->revision,
			dev_desc->product);
		break;
	case IF_TYPE_SD:
	case IF_TYPE_MMC:
	case IF_TYPE_USB:
	case IF_TYPE_NVME:
		printf ("Vendor: %s Rev: %s Prod: %s\n",
			dev_desc->vendor,
			dev_desc->revision,
			dev_desc->product);
		break;
	case IF_TYPE_VIRTIO:
		printf("%s VirtIO Block Device\n", dev_desc->vendor);
		break;
	case IF_TYPE_DOC:
		puts("device type DOC\n");
		return;
	case IF_TYPE_UNKNOWN:
		puts("device type unknown\n");
		return;
	default:
		printf("Unhandled device type: %i\n", dev_desc->if_type);
		return;
	}
	puts ("            Type: ");
	if (dev_desc->removable)
		puts ("Removable ");
	switch (dev_desc->type & 0x1F) {
	case DEV_TYPE_HARDDISK:
		puts ("Hard Disk");
		break;
	case DEV_TYPE_CDROM:
		puts ("CD ROM");
		break;
	case DEV_TYPE_OPDISK:
		puts ("Optical Device");
		break;
	case DEV_TYPE_TAPE:
		puts ("Tape");
		break;
	default:
		printf ("# %02X #", dev_desc->type & 0x1F);
		break;
	}
	puts ("\n");
	if (dev_desc->lba > 0L && dev_desc->blksz > 0L) {
		ulong mb, mb_quot, mb_rem, gb, gb_quot, gb_rem;
		lbaint_t lba;

		lba = dev_desc->lba;

		lba512 = (lba * (dev_desc->blksz/512));
		/* round to 1 digit */
		/* 2048 = (1024 * 1024) / 512 MB */
		mb = lba512_muldiv(lba512, 10, 11);

		mb_quot	= mb / 10;
		mb_rem	= mb - (10 * mb_quot);

		gb = mb / 1024;
		gb_quot	= gb / 10;
		gb_rem	= gb - (10 * gb_quot);
#ifdef CONFIG_LBA48
		if (dev_desc->lba48)
			printf ("            Supports 48-bit addressing\n");
#endif
#if defined(CONFIG_SYS_64BIT_LBA)
		printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%llu x %lu)\n",
			mb_quot, mb_rem,
			gb_quot, gb_rem,
			lba,
			dev_desc->blksz);
#else
		printf ("            Capacity: %lu.%lu MB = %lu.%lu GB (%lu x %lu)\n",
			mb_quot, mb_rem,
			gb_quot, gb_rem,
			(ulong)lba,
			dev_desc->blksz);
#endif
	} else {
		puts ("            Capacity: not available\n");
	}
}
#endif

#ifdef CONFIG_HAVE_BLOCK_DEVICE

void part_init(struct blk_desc *dev_desc)
{
	struct part_driver *drv =
		ll_entry_start(struct part_driver, part_driver);
	const int n_ents = ll_entry_count(struct part_driver, part_driver);
	struct part_driver *entry;

	blkcache_invalidate(dev_desc->if_type, dev_desc->devnum);

	dev_desc->part_type = PART_TYPE_UNKNOWN;
	for (entry = drv; entry != drv + n_ents; entry++) {
		int ret;

		ret = entry->test(dev_desc);
		debug("%s: try '%s': ret=%d\n", __func__, entry->name, ret);
		if (!ret) {
			dev_desc->part_type = entry->part_type;
			break;
		}
	}
}

static void print_part_header(const char *type, struct blk_desc *dev_desc)
{
#if CONFIG_IS_ENABLED(MAC_PARTITION) || \
	CONFIG_IS_ENABLED(DOS_PARTITION) || \
	CONFIG_IS_ENABLED(ISO_PARTITION) || \
	CONFIG_IS_ENABLED(AMIGA_PARTITION) || \
	CONFIG_IS_ENABLED(EFI_PARTITION)
	puts ("\nPartition Map for ");
	switch (dev_desc->if_type) {
	case IF_TYPE_IDE:
		puts ("IDE");
		break;
	case IF_TYPE_SATA:
		puts ("SATA");
		break;
	case IF_TYPE_SCSI:
		puts ("SCSI");
		break;
	case IF_TYPE_ATAPI:
		puts ("ATAPI");
		break;
	case IF_TYPE_USB:
		puts ("USB");
		break;
	case IF_TYPE_DOC:
		puts ("DOC");
		break;
	case IF_TYPE_MMC:
		puts ("MMC");
		break;
	case IF_TYPE_HOST:
		puts ("HOST");
		break;
	case IF_TYPE_NVME:
		puts ("NVMe");
		break;
	case IF_TYPE_VIRTIO:
		puts("VirtIO");
		break;
	default:
		puts ("UNKNOWN");
		break;
	}
	printf (" device %d  --   Partition Type: %s\n\n",
			dev_desc->devnum, type);
#endif /* any CONFIG_..._PARTITION */
}

void part_print(struct blk_desc *dev_desc)
{
	struct part_driver *drv;

	drv = part_driver_lookup_type(dev_desc);
	if (!drv) {
		printf("## Unknown partition table type %x\n",
		       dev_desc->part_type);
		return;
	}

	PRINTF("## Testing for valid %s partition ##\n", drv->name);
	print_part_header(drv->name, dev_desc);
	if (drv->print)
		drv->print(dev_desc);
}

#endif /* CONFIG_HAVE_BLOCK_DEVICE */

int part_get_info(struct blk_desc *dev_desc, int part,
		       struct disk_partition *info)
{
#ifdef CONFIG_HAVE_BLOCK_DEVICE
	struct part_driver *drv;

#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
	/* The common case is no UUID support */
	info->uuid[0] = 0;
#endif
#ifdef CONFIG_PARTITION_TYPE_GUID
	info->type_guid[0] = 0;
#endif

	drv = part_driver_lookup_type(dev_desc);
	if (!drv) {
		debug("## Unknown partition table type %x\n",
		      dev_desc->part_type);
		return -EPROTONOSUPPORT;
	}
	if (!drv->get_info) {
		PRINTF("## Driver %s does not have the get_info() method\n",
		       drv->name);
		return -ENOSYS;
	}
	if (drv->get_info(dev_desc, part, info) == 0) {
		PRINTF("## Valid %s partition found ##\n", drv->name);
		return 0;
	}
#endif /* CONFIG_HAVE_BLOCK_DEVICE */

	return -1;
}

int part_get_info_whole_disk(struct blk_desc *dev_desc,
			     struct disk_partition *info)
{
	info->start = 0;
	info->size = dev_desc->lba;
	info->blksz = dev_desc->blksz;
	info->bootable = 0;
	strcpy((char *)info->type, BOOT_PART_TYPE);
	strcpy((char *)info->name, "Whole Disk");
#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
	info->uuid[0] = 0;
#endif
#ifdef CONFIG_PARTITION_TYPE_GUID
	info->type_guid[0] = 0;
#endif

	return 0;
}

int blk_get_device_by_str(const char *ifname, const char *dev_hwpart_str,
			  struct blk_desc **dev_desc)
{
	char *ep;
	char *dup_str = NULL;
	const char *dev_str, *hwpart_str;
	int dev, hwpart;

	hwpart_str = strchr(dev_hwpart_str, '.');
	if (hwpart_str) {
		dup_str = strdup(dev_hwpart_str);
		dup_str[hwpart_str - dev_hwpart_str] = 0;
		dev_str = dup_str;
		hwpart_str++;
	} else {
		dev_str = dev_hwpart_str;
		hwpart = 0;
	}

	dev = simple_strtoul(dev_str, &ep, 16);
	if (*ep) {
		printf("** Bad device specification %s %s **\n",
		       ifname, dev_str);
		dev = -EINVAL;
		goto cleanup;
	}

	if (hwpart_str) {
		hwpart = simple_strtoul(hwpart_str, &ep, 16);
		if (*ep) {
			printf("** Bad HW partition specification %s %s **\n",
			    ifname, hwpart_str);
			dev = -EINVAL;
			goto cleanup;
		}
	}

	*dev_desc = get_dev_hwpart(ifname, dev, hwpart);
	if (!(*dev_desc) || ((*dev_desc)->type == DEV_TYPE_UNKNOWN)) {
		debug("** Bad device %s %s **\n", ifname, dev_hwpart_str);
		dev = -ENOENT;
		goto cleanup;
	}

#ifdef CONFIG_HAVE_BLOCK_DEVICE
	/*
	 * Updates the partition table for the specified hw partition.
	 * Always should be done, otherwise hw partition 0 will return stale
	 * data after displaying a non-zero hw partition.
	 */
	part_init(*dev_desc);
#endif

cleanup:
	free(dup_str);
	return dev;
}

#define PART_UNSPECIFIED -2
#define PART_AUTO -1
int blk_get_device_part_str(const char *ifname, const char *dev_part_str,
			     struct blk_desc **dev_desc,
			     struct disk_partition *info, int allow_whole_dev)
{
	int ret = -1;
	const char *part_str;
	char *dup_str = NULL;
	const char *dev_str;
	int dev;
	char *ep;
	int p;
	int part;
	struct disk_partition tmpinfo;

#ifdef CONFIG_SANDBOX
	/*
	 * Special-case a pseudo block device "hostfs", to allow access to the
	 * host's own filesystem.
	 */
	if (0 == strcmp(ifname, "hostfs")) {
		*dev_desc = NULL;
		info->start = 0;
		info->size = 0;
		info->blksz = 0;
		info->bootable = 0;
		strcpy((char *)info->type, BOOT_PART_TYPE);
		strcpy((char *)info->name, "Sandbox host");
#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
		info->uuid[0] = 0;
#endif
#ifdef CONFIG_PARTITION_TYPE_GUID
		info->type_guid[0] = 0;
#endif

		return 0;
	}
#endif

#ifdef CONFIG_CMD_UBIFS
	/*
	 * Special-case ubi, ubi goes through a mtd, rather than through
	 * a regular block device.
	 */
	if (0 == strcmp(ifname, "ubi")) {
		if (!ubifs_is_mounted()) {
			printf("UBIFS not mounted, use ubifsmount to mount volume first!\n");
			return -1;
		}

		*dev_desc = NULL;
		memset(info, 0, sizeof(*info));
		strcpy((char *)info->type, BOOT_PART_TYPE);
		strcpy((char *)info->name, "UBI");
#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
		info->uuid[0] = 0;
#endif
		return 0;
	}
#endif

	/* If no dev_part_str, use bootdevice environment variable */
	if (!dev_part_str || !strlen(dev_part_str) ||
	    !strcmp(dev_part_str, "-"))
		dev_part_str = env_get("bootdevice");

	/* If still no dev_part_str, it's an error */
	if (!dev_part_str) {
		printf("** No device specified **\n");
		goto cleanup;
	}

	/* Separate device and partition ID specification */
	part_str = strchr(dev_part_str, ':');
	if (part_str) {
		dup_str = strdup(dev_part_str);
		dup_str[part_str - dev_part_str] = 0;
		dev_str = dup_str;
		part_str++;
	} else {
		dev_str = dev_part_str;
	}

	/* Look up the device */
	dev = blk_get_device_by_str(ifname, dev_str, dev_desc);
	if (dev < 0)
		goto cleanup;

	/* Convert partition ID string to number */
	if (!part_str || !*part_str) {
		part = PART_UNSPECIFIED;
	} else if (!strcmp(part_str, "auto")) {
		part = PART_AUTO;
	} else {
		/* Something specified -> use exactly that */
		part = (int)simple_strtoul(part_str, &ep, 16);
		/*
		 * Less than whole string converted,
		 * or request for whole device, but caller requires partition.
		 */
		if (*ep || (part == 0 && !allow_whole_dev)) {
			printf("** Bad partition specification %s %s **\n",
			    ifname, dev_part_str);
			goto cleanup;
		}
	}

	/*
	 * No partition table on device,
	 * or user requested partition 0 (entire device).
	 */
	if (((*dev_desc)->part_type == PART_TYPE_UNKNOWN) ||
	    (part == 0)) {
		if (!(*dev_desc)->lba) {
			printf("** Bad device size - %s %s **\n", ifname,
			       dev_str);
			goto cleanup;
		}

		/*
		 * If user specified a partition ID other than 0,
		 * or the calling command only accepts partitions,
		 * it's an error.
		 */
		if ((part > 0) || (!allow_whole_dev)) {
			printf("** No partition table - %s %s **\n", ifname,
			       dev_str);
			goto cleanup;
		}

		(*dev_desc)->log2blksz = LOG2((*dev_desc)->blksz);

		part_get_info_whole_disk(*dev_desc, info);

		ret = 0;
		goto cleanup;
	}

	/*
	 * Now there's known to be a partition table,
	 * not specifying a partition means to pick partition 1.
	 */
	if (part == PART_UNSPECIFIED)
		part = 1;

	/*
	 * If user didn't specify a partition number, or did specify something
	 * other than "auto", use that partition number directly.
	 */
	if (part != PART_AUTO) {
		ret = part_get_info(*dev_desc, part, info);
		if (ret) {
			printf("** Invalid partition %d **\n", part);
			goto cleanup;
		}
	} else {
		/*
		 * Find the first bootable partition.
		 * If none are bootable, fall back to the first valid partition.
		 */
		part = 0;
		for (p = 1; p <= MAX_SEARCH_PARTITIONS; p++) {
			ret = part_get_info(*dev_desc, p, info);
			if (ret)
				continue;

			/*
			 * First valid partition, or new better partition?
			 * If so, save partition ID.
			 */
			if (!part || info->bootable)
				part = p;

			/* Best possible partition? Stop searching. */
			if (info->bootable)
				break;

			/*
			 * We now need to search further for best possible.
			 * If we what we just queried was the best so far,
			 * save the info since we over-write it next loop.
			 */
			if (part == p)
				tmpinfo = *info;
		}
		/* If we found any acceptable partition */
		if (part) {
			/*
			 * If we searched all possible partition IDs,
			 * return the first valid partition we found.
			 */
			if (p == MAX_SEARCH_PARTITIONS + 1)
				*info = tmpinfo;
		} else {
			printf("** No valid partitions found **\n");
			ret = -1;
			goto cleanup;
		}
	}
	if (strncmp((char *)info->type, BOOT_PART_TYPE, sizeof(info->type)) != 0) {
		printf("** Invalid partition type \"%.32s\""
			" (expect \"" BOOT_PART_TYPE "\")\n",
			info->type);
		ret  = -1;
		goto cleanup;
	}

	(*dev_desc)->log2blksz = LOG2((*dev_desc)->blksz);

	ret = part;
	goto cleanup;

cleanup:
	free(dup_str);
	return ret;
}

int part_get_info_by_name_type(struct blk_desc *dev_desc, const char *name,
			       struct disk_partition *info, int part_type)
{
	struct part_driver *part_drv;
	int ret;
	int i;

	part_drv = part_driver_lookup_type(dev_desc);
	if (!part_drv)
		return -1;
	for (i = 1; i < part_drv->max_entries; i++) {
		ret = part_drv->get_info(dev_desc, i, info);
		if (ret != 0) {
			/* no more entries in table */
			break;
		}
		if (strcmp(name, (const char *)info->name) == 0) {
			/* matched */
			return i;
		}
	}

	return -1;
}

int part_get_info_by_name(struct blk_desc *dev_desc, const char *name,
			  struct disk_partition *info)
{
	return part_get_info_by_name_type(dev_desc, name, info, PART_TYPE_ALL);
}

/**
 * Get partition info from device number and partition name.
 *
 * Parse a device number and partition name string in the form of
 * "device_num#partition_name", for example "0#misc". If the partition
 * is found, sets dev_desc and part_info accordingly with the information
 * of the partition with the given partition_name.
 *
 * @param[in] dev_iface Device interface
 * @param[in] dev_part_str Input string argument, like "0#misc"
 * @param[out] dev_desc Place to store the device description pointer
 * @param[out] part_info Place to store the partition information
 * @return 0 on success, or a negative on error
 */
static int part_get_info_by_dev_and_name(const char *dev_iface,
					 const char *dev_part_str,
					 struct blk_desc **dev_desc,
					 struct disk_partition *part_info)
{
	char *ep;
	const char *part_str;
	int dev_num;

	part_str = strchr(dev_part_str, '#');
	if (!part_str || part_str == dev_part_str)
		return -EINVAL;

	dev_num = simple_strtoul(dev_part_str, &ep, 16);
	if (ep != part_str) {
		/* Not all the first part before the # was parsed. */
		return -EINVAL;
	}
	part_str++;

	*dev_desc = blk_get_dev(dev_iface, dev_num);
	if (!*dev_desc) {
		printf("Could not find %s %d\n", dev_iface, dev_num);
		return -EINVAL;
	}
	if (part_get_info_by_name(*dev_desc, part_str, part_info) < 0) {
		printf("Could not find \"%s\" partition\n", part_str);
		return -EINVAL;
	}
	return 0;
}

int part_get_info_by_dev_and_name_or_num(const char *dev_iface,
					 const char *dev_part_str,
					 struct blk_desc **dev_desc,
					 struct disk_partition *part_info)
{
	/* Split the part_name if passed as "$dev_num#part_name". */
	if (!part_get_info_by_dev_and_name(dev_iface, dev_part_str,
					   dev_desc, part_info))
		return 0;
	/*
	 * Couldn't lookup by name, try looking up the partition description
	 * directly.
	 */
	if (blk_get_device_part_str(dev_iface, dev_part_str,
				    dev_desc, part_info, 1) < 0) {
		printf("Couldn't find partition %s %s\n",
		       dev_iface, dev_part_str);
		return -EINVAL;
	}
	return 0;
}

void part_set_generic_name(const struct blk_desc *dev_desc,
	int part_num, char *name)
{
	char *devtype;

	switch (dev_desc->if_type) {
	case IF_TYPE_IDE:
	case IF_TYPE_SATA:
	case IF_TYPE_ATAPI:
		devtype = "hd";
		break;
	case IF_TYPE_SCSI:
		devtype = "sd";
		break;
	case IF_TYPE_USB:
		devtype = "usbd";
		break;
	case IF_TYPE_DOC:
		devtype = "docd";
		break;
	case IF_TYPE_MMC:
	case IF_TYPE_SD:
		devtype = "mmcsd";
		break;
	default:
		devtype = "xx";
		break;
	}

	sprintf(name, "%s%c%d", devtype, 'a' + dev_desc->devnum, part_num);
}