aboutsummaryrefslogtreecommitdiff
path: root/ubi-utils/old-tools/src/libubi.c
blob: be06f70a8c45131e5bfcf6984434fc39bfb33067 (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
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
/*
 * Copyright (c) International Business Machines Corp., 2006
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
 * the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Author: Artem B. Bityutskiy
 *
 * UBI (Unsorted Block Images) library.
 */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <limits.h>
#include "libubi.h"
#include "libubi_int.h"

/**
 * mkpath - compose full path from 2 given components.
 * @path: the first component
 * @name: the second component
 *
 * This function returns the resulting path in case of success and %NULL in
 * case of failure.
 */
static char *mkpath(const char *path, const char *name)
{
	char *n;
	int len1 = strlen(path);
	int len2 = strlen(name);

	n = malloc(len1 + len2 + 2);
	if (!n) {
		errmsg("cannot allocate %d bytes", len1 + len2 + 2);
		perror("malloc");
		return NULL;
	}

	memcpy(n, path, len1);
	if (n[len1 - 1] != '/')
		n[len1++] = '/';

	memcpy(n + len1, name, len2 + 1);
	return n;
}

/**
 * read_positive_ll - read a positive 'long long' value from a file.
 * @file: the file to read from
 * @value: the result is stored here
 *
 * This function reads file @file and interprets its contents as a positive
 * 'long long' integer. If this is not true, it fails with %EINVAL error code.
 * Returns %0 in case of success and %-1 in case of failure.
 */
static int read_positive_ll(const char *file, long long *value)
{
	int fd, rd;
	char buf[50];

	fd = open(file, O_RDONLY);
	if (fd == -1)
		return -1;

	rd = read(fd, buf, 50);
	if (rd == -1) {
		errmsg("cannot read \"%s\"", file);
		perror("read");
		goto out_error;
	}
	if (rd == 50) {
		errmsg("contents of \"%s\" is too long", file);
		errno = EINVAL;
		goto out_error;
	}

	if (sscanf(buf, "%lld\n", value) != 1) {
		/* This must be a UBI bug */
		errmsg("cannot read integer from \"%s\"\n", file);
		errno = EINVAL;
		goto out_error;
	}

	if (*value < 0) {
		errmsg("negative value %lld in \"%s\"", *value, file);
		errno = EINVAL;
		goto out_error;
	}

	if (close(fd)) {
		errmsg("close failed on \"%s\"", file);
		perror("close");
		return -1;
	}

	return 0;

out_error:
	close(fd);
	return -1;
}

/**
 * read_positive_int - read a positive 'int' value from a file.
 * @file: the file to read from
 * @value: the result is stored here
 *
 * This function is the same as 'read_positive_ll()', but it reads an 'int'
 * value, not 'long long'.
 */
static int read_positive_int(const char *file, int *value)
{
	long long res;

	if (read_positive_ll(file, &res))
		return -1;

	/* Make sure the value is not too big */
	if (res > INT_MAX) {
		errmsg("value %lld read from file \"%s\" is out of range",
		       res, file);
		errno = EINVAL;
		return -1;
	}

	*value = res;
	return 0;
}

/**
 * read_data - read data from a file.
 * @file: the file to read from
 * @buf: the buffer to read to
 * @buf_len: buffer length
 *
 * This function returns number of read bytes in case of success and %-1 in
 * case of failure. Note, if the file contains more then @buf_len bytes of
 * date, this function fails with %EINVAL error code.
 */
static int read_data(const char *file, void *buf, int buf_len)
{
	int fd, rd, tmp, tmp1;

	fd = open(file, O_RDONLY);
	if (fd == -1)
		return -1;

	rd = read(fd, buf, buf_len);
	if (rd == -1) {
		errmsg("cannot read \"%s\"", file);
		perror("read");
		goto out_error;
	}

	/* Make sure all data is read */
	tmp1 = read(fd, &tmp, 1);
	if (tmp1 == 1) {
		errmsg("cannot read \"%s\"", file);
		perror("read");
		goto out_error;
	}
	if (tmp1) {
		errmsg("file \"%s\" contains too much data (> %d bytes)",
		       file, buf_len);
		errno = EINVAL;
		goto out_error;
	}

	if (close(fd)) {
		errmsg("close failed on \"%s\"", file);
		perror("close");
		return -1;
	}

	return rd;

out_error:
	close(fd);
	return -1;
}

/**
 * read_major - read major and minor numbers from a file.
 * @file: name of the file to read from
 * @major: major number is returned here
 * @minor: minor number is returned here
 *
 * This function returns % in case of succes, and %-1 in case of failure.
 */
static int read_major(const char *file, int *major, int *minor)
{
	int ret;
	char buf[50];

	ret = read_data(file, buf, 50);
	if (ret < 0)
		return ret;

	ret = sscanf(buf, "%d:%d\n", major, minor);
	if (ret != 2) {
		errmsg("\"%s\" does not have major:minor format", file);
		errno = EINVAL;
		return -1;
	}

	if (*major < 0 || *minor < 0) {
		errmsg("bad major:minor %d:%d in \"%s\"",
		       *major, *minor, file);
		errno = EINVAL;
		return -1;
	}

	return 0;
}

/**
 * dev_read_int - read a positive 'int' value from an UBI device sysfs file.
 * @patt: file pattern to read from
 * @dev_num:  UBI device number
 * @value: the result is stored here
 *
 * This function returns %0 in case of success and %-1 in case of failure.
 */
static int dev_read_int(const char *patt, int dev_num, int *value)
{
	char file[strlen(patt) + 50];

	sprintf(file, patt, dev_num);
	return read_positive_int(file, value);
}

/**
 * vol_read_int - read a positive 'int' value from an UBI volume sysfs file.
 * @patt: file pattern to read from
 * @dev_num: UBI device number
 * @vol_id: volume ID
 * @value: the result is stored here
 *
 * This function returns %0 in case of success and %-1 in case of failure.
 */
static int vol_read_int(const char *patt, int dev_num, int vol_id, int *value)
{
	char file[strlen(patt) + 100];

	sprintf(file, patt, dev_num, vol_id);
	return read_positive_int(file, value);
}

/**
 * dev_read_ll - read a positive 'long long' value from an UBI device sysfs file.
 * @patt: file pattern to read from
 * @dev_num: UBI device number
 * @value: the result is stored here
 *
 * This function returns %0 in case of success and %-1 in case of failure.
 */
static int dev_read_ll(const char *patt, int dev_num, long long *value)
{
	char file[strlen(patt) + 50];

	sprintf(file, patt, dev_num);
	return read_positive_ll(file, value);
}

/**
 * vol_read_ll - read a positive 'long long' value from an UBI volume sysfs file.
 * @patt: file pattern to read from
 * @dev_num: UBI device number
 * @vol_id: volume ID
 * @value: the result is stored here
 *
 * This function returns %0 in case of success and %-1 in case of failure.
 */
static int vol_read_ll(const char *patt, int dev_num, int vol_id,
		       long long *value)
{
	char file[strlen(patt) + 100];

	sprintf(file, patt, dev_num, vol_id);
	return read_positive_ll(file, value);
}

/**
 * vol_read_data - read data from an UBI volume's sysfs file.
 * @patt: file pattern to read from
 * @dev_num: UBI device number
 * @vol_id: volume ID
 * @buf: buffer to read to
 * @buf_len: buffer length
 *
 * This function returns number of read bytes in case of success and %-1 in
 * case of failure.
 */
static int vol_read_data(const char *patt, int dev_num, int vol_id, void *buf,
			 int buf_len)
{
	char file[strlen(patt) + 100];

	sprintf(file, patt, dev_num, vol_id);
	return read_data(file, buf, buf_len);
}

/**
 * dent_is_dir - check if a file is a directory.
 * @dir: the base directory path of the file
 * @name: file name
 *
 * This function returns %1 if file @name in directory @dir is a directoru, and
 * %0 if not.
 */
static int dent_is_dir(const char *dir, const char *name)
{
	int ret;
	struct stat st;
	char full_path[strlen(dir) + strlen(name) + 2];

	sprintf(full_path, "%s/%s", dir, name);
	ret = lstat(full_path, &st);
	if (ret) {
		errmsg("lstat failed on \"%s\"", full_path);
		perror("lstat");
		return -1;
	}

	return !!S_ISDIR(st.st_mode);
}

/**
 * dev_get_major - get major and minor numbers of an UBI device.
 * @lib: libubi descriptor
 * @dev_num: UBI device number
 * @major: major number is returned here
 * @minor: minor number is returned here
 *
 * This function returns zero in case of succes and %-1 in case of failure.
 */
static int dev_get_major(struct libubi *lib, int dev_num, int *major, int *minor)
{
	char file[strlen(lib->dev_dev) + 50];

	sprintf(file, lib->dev_dev, dev_num);
	return read_major(file, major, minor);
}

/**
 * vol_get_major - get major and minor numbers of an UBI volume.
 * @lib: libubi descriptor
 * @dev_num: UBI device number
 * @vol_id: volume ID
 * @major: major number is returned here
 * @minor: minor number is returned here
 *
 * This function returns zero in case of succes and %-1 in case of failure.
 */
static int vol_get_major(struct libubi *lib, int dev_num, int vol_id,
			 int *major, int *minor)
{
	char file[strlen(lib->vol_dev) + 100];

	sprintf(file, lib->vol_dev, dev_num, vol_id);
	return read_major(file, major, minor);
}

/**
 * vol_node2nums - find UBI device number and volume ID by volume device node
 *                 file.
 * @lib: UBI library descriptor
 * @node: UBI character device node name
 * @dev_num: UBI device number is returned here
 * @vol_id: volume ID is returned hers
 *
 * This function returns zero in case of succes and %-1 in case of failure.
 */
static int vol_node2nums(struct libubi *lib, const char *node, int *dev_num,
			 int *vol_id)
{
	struct stat st;
	struct ubi_info info;
	int i, fd, major, minor;
	char file[strlen(lib->ubi_vol) + 100];

	if (lstat(node, &st))
		return -1;

	if (!S_ISCHR(st.st_mode)) {
		errmsg("\"%s\" is not a character device", node);
		errno = EINVAL;
		return -1;
	}

	major = major(st.st_rdev);
	minor = minor(st.st_rdev);

	if (minor == 0) {
		errmsg("\"%s\" is not a volume character device", node);
		errno = EINVAL;
		return -1;
	}

	if (ubi_get_info((libubi_t *)lib, &info))
		return -1;

	for (i = info.lowest_dev_num; i <= info.highest_dev_num; i++) {
		int major1, minor1, ret;

		ret = dev_get_major(lib, i, &major1, &minor1);
		if (ret) {
			if (errno == ENOENT)
				continue;
			return -1;
		}

		if (major1 == major)
			break;
	}

	if (i > info.highest_dev_num) {
		errno = ENODEV;
		return -1;
	}

	/* Make sure this UBI volume exists */
	sprintf(file, lib->ubi_vol, i, minor - 1);
	fd = open(file, O_RDONLY);
	if (fd == -1) {
		errno = ENODEV;
		return -1;
	}

	*dev_num = i;
	*vol_id = minor - 1;
	errno = 0;
	return 0;
}

/**
 * dev_node2num - find UBI device number by its character device node.
 * @lib: UBI library descriptor
 * @node: UBI character device node name
 *
 * This function returns positive UBI device number in case of success and %-1
 * in case of failure.
 */
static int dev_node2num(struct libubi *lib, const char *node, int *dev_num)
{
	struct stat stat;
	struct ubi_info info;
	int i, major, minor;

	if (lstat(node, &stat))
		return -1;

	if (!S_ISCHR(stat.st_mode)) {
		errmsg("\"%s\" is not a character device", node);
		errno = EINVAL;
		return -1;
	}

	major = major(stat.st_rdev);
	minor = minor(stat.st_rdev);

	if (minor != 0) {
		errmsg("\"%s\" is not an UBI character device", node);
		errno = EINVAL;
		return -1;
	}

	if (ubi_get_info((libubi_t *)lib, &info))
		return -1;

	for (i = info.lowest_dev_num; i <= info.highest_dev_num; i++) {
		int major1, minor1, ret;

		ret = dev_get_major(lib, i, &major1, &minor1);
		if (ret) {
			if (errno == ENOENT)
				continue;
			return -1;
		}

		if (major1 == major) {
			if (minor1 != 0) {
				errmsg("UBI character device minor number is "
				       "%d, but must be 0", minor1);
				errno = EINVAL;
				return -1;
			}
			errno = 0;
			*dev_num = i;
			return 0;
		}
	}

	errno = ENODEV;
	return -1;
}

static int mtd_num2ubi_dev(struct libubi *lib, int mtd_num, int *dev_num)
{
	struct ubi_info info;
	int i, ret, mtd_num1;

	if (ubi_get_info((libubi_t *)lib, &info))
		return -1;

	for (i = info.lowest_dev_num; i <= info.highest_dev_num; i++) {
		ret = dev_read_int(lib->dev_mtd_num, i, &mtd_num1);
		if (ret) {
			if (errno == ENOENT)
				continue;
			return -1;
		}

		if (mtd_num1 == mtd_num) {
			errno = 0;
			*dev_num = i;
			return 0;
		}
	}

	errno = ENODEV;
	return -1;
}

libubi_t libubi_open(void)
{
	int fd, version;
	struct libubi *lib;

	lib = calloc(1, sizeof(struct libubi));
	if (!lib)
		return NULL;

	/* TODO: this must be discovered instead */
	lib->sysfs = strdup("/sys");
	if (!lib->sysfs)
		goto out_error;

	lib->sysfs_ctrl = mkpath(lib->sysfs, SYSFS_CTRL);
	if (!lib->sysfs_ctrl)
		goto out_error;

	lib->ctrl_dev = mkpath(lib->sysfs_ctrl, CTRL_DEV);
	if (!lib->ctrl_dev)
		goto out_error;

	lib->sysfs_ubi = mkpath(lib->sysfs, SYSFS_UBI);
	if (!lib->sysfs_ubi)
		goto out_error;

	/* Make sure UBI is present */
	fd = open(lib->sysfs_ubi, O_RDONLY);
	if (fd == -1) {
		errmsg("cannot open \"%s\", UBI does not seem to exist in system",
		       lib->sysfs_ubi);
		goto out_error;
	}

	if (close(fd)) {
		errmsg("close failed on \"%s\"", lib->sysfs_ubi);
		perror("close");
		goto out_error;
	}

	lib->ubi_dev = mkpath(lib->sysfs_ubi, UBI_DEV_NAME_PATT);
	if (!lib->ubi_dev)
		goto out_error;

	lib->ubi_version = mkpath(lib->sysfs_ubi, UBI_VER);
	if (!lib->ubi_version)
		goto out_error;

	lib->dev_dev = mkpath(lib->ubi_dev, DEV_DEV);
	if (!lib->dev_dev)
		goto out_error;

	lib->dev_avail_ebs = mkpath(lib->ubi_dev, DEV_AVAIL_EBS);
	if (!lib->dev_avail_ebs)
		goto out_error;

	lib->dev_total_ebs = mkpath(lib->ubi_dev, DEV_TOTAL_EBS);
	if (!lib->dev_total_ebs)
		goto out_error;

	lib->dev_bad_count = mkpath(lib->ubi_dev, DEV_BAD_COUNT);
	if (!lib->dev_bad_count)
		goto out_error;

	lib->dev_eb_size = mkpath(lib->ubi_dev, DEV_EB_SIZE);
	if (!lib->dev_eb_size)
		goto out_error;

	lib->dev_max_ec = mkpath(lib->ubi_dev, DEV_MAX_EC);
	if (!lib->dev_max_ec)
		goto out_error;

	lib->dev_bad_rsvd = mkpath(lib->ubi_dev, DEV_MAX_RSVD);
	if (!lib->dev_bad_rsvd)
		goto out_error;

	lib->dev_max_vols = mkpath(lib->ubi_dev, DEV_MAX_VOLS);
	if (!lib->dev_max_vols)
		goto out_error;

	lib->dev_min_io_size = mkpath(lib->ubi_dev, DEV_MIN_IO_SIZE);
	if (!lib->dev_min_io_size)
		goto out_error;

	lib->dev_mtd_num = mkpath(lib->ubi_dev, DEV_MTD_NUM);
	if (!lib->dev_mtd_num)
		goto out_error;

	lib->ubi_vol = mkpath(lib->sysfs_ubi, UBI_VOL_NAME_PATT);
	if (!lib->ubi_vol)
		goto out_error;

	lib->vol_type = mkpath(lib->ubi_vol, VOL_TYPE);
	if (!lib->vol_type)
		goto out_error;

	lib->vol_dev = mkpath(lib->ubi_vol, VOL_DEV);
	if (!lib->vol_dev)
		goto out_error;

	lib->vol_alignment = mkpath(lib->ubi_vol, VOL_ALIGNMENT);
	if (!lib->vol_alignment)
		goto out_error;

	lib->vol_data_bytes = mkpath(lib->ubi_vol, VOL_DATA_BYTES);
	if (!lib->vol_data_bytes)
		goto out_error;

	lib->vol_rsvd_ebs = mkpath(lib->ubi_vol, VOL_RSVD_EBS);
	if (!lib->vol_rsvd_ebs)
		goto out_error;

	lib->vol_eb_size = mkpath(lib->ubi_vol, VOL_EB_SIZE);
	if (!lib->vol_eb_size)
		goto out_error;

	lib->vol_corrupted = mkpath(lib->ubi_vol, VOL_CORRUPTED);
	if (!lib->vol_corrupted)
		goto out_error;

	lib->vol_name = mkpath(lib->ubi_vol, VOL_NAME);
	if (!lib->vol_name)
		goto out_error;

	if (read_positive_int(lib->ubi_version, &version))
		goto out_error;
	if (version != LIBUBI_UBI_VERSION) {
		fprintf(stderr, "LIBUBI: this library was made for UBI version "
				"%d, but UBI version %d is detected\n",
			LIBUBI_UBI_VERSION, version);
		goto out_error;
	}

	return lib;

out_error:
	libubi_close((libubi_t)lib);
	return NULL;
}

void libubi_close(libubi_t desc)
{
	struct libubi *lib = (struct libubi *)desc;

	free(lib->vol_name);
	free(lib->vol_corrupted);
	free(lib->vol_eb_size);
	free(lib->vol_rsvd_ebs);
	free(lib->vol_data_bytes);
	free(lib->vol_alignment);
	free(lib->vol_dev);
	free(lib->vol_type);
	free(lib->ubi_vol);
	free(lib->dev_mtd_num);
	free(lib->dev_min_io_size);
	free(lib->dev_max_vols);
	free(lib->dev_bad_rsvd);
	free(lib->dev_max_ec);
	free(lib->dev_eb_size);
	free(lib->dev_bad_count);
	free(lib->dev_total_ebs);
	free(lib->dev_avail_ebs);
	free(lib->dev_dev);
	free(lib->ubi_version);
	free(lib->ubi_dev);
	free(lib->sysfs_ubi);
	free(lib->ctrl_dev);
	free(lib->sysfs_ctrl);
	free(lib->sysfs);
	free(lib);
}

int ubi_attach_mtd(libubi_t desc, const char *node,
		   struct ubi_attach_request *req)
{
	int fd, ret;
	struct ubi_attach_req r;

	memset(&r, sizeof(struct ubi_attach_req), '\0');

	desc = desc;
	r.ubi_num = req->dev_num;
	r.mtd_num = req->mtd_num;
	r.vid_hdr_offset = req->vid_hdr_offset;

	fd = open(node, O_RDONLY);
	if (fd == -1)
		return -1;

	ret = ioctl(fd, UBI_IOCATT, &r);
	close(fd);
	if (ret == -1)
		return -1;

	req->dev_num = r.ubi_num;

#ifdef UDEV_SETTLE_HACK
	if (system("udevsettle") == -1)
		return -1;
	if (system("udevsettle") == -1)
		return -1;
#endif

	return ret;
}

int ubi_detach_mtd(libubi_t desc, const char *node, int mtd_num)
{
	int ret, ubi_dev;

	ret = mtd_num2ubi_dev(desc, mtd_num, &ubi_dev);
	if (ret == -1)
		return ret;

	return ubi_remove_dev(desc, node, ubi_dev);
}

int ubi_remove_dev(libubi_t desc, const char *node, int ubi_dev)
{
	int fd, ret;

	desc = desc;

	fd = open(node, O_RDONLY);
	if (fd == -1)
		return -1;
	ret = ioctl(fd, UBI_IOCDET, &ubi_dev);
	if (ret == -1)
		goto out_close;

#ifdef UDEV_SETTLE_HACK
	if (system("udevsettle") == -1)
		return -1;
#endif

out_close:
	close(fd);
	return ret;
}

int ubi_node_type(libubi_t desc, const char *node)
{
	struct stat st;
	struct ubi_info info;
	int i, fd, major, minor;
	struct libubi *lib = (struct libubi *)desc;
	char file[strlen(lib->ubi_vol) + 100];

	if (lstat(node, &st))
		return -1;

	if (!S_ISCHR(st.st_mode)) {
		errno = EINVAL;
		return -1;
	}

	major = major(st.st_rdev);
	minor = minor(st.st_rdev);

	if (ubi_get_info((libubi_t *)lib, &info))
		return -1;

	for (i = info.lowest_dev_num; i <= info.highest_dev_num; i++) {
		int major1, minor1, ret;

		ret = dev_get_major(lib, i, &major1, &minor1);
		if (ret) {
			if (errno == ENOENT)
				continue;
			return -1;
		}

		if (major1 == major)
			break;
	}

	if (i > info.highest_dev_num) {
		/*
		 * The character device node does not correspond to any
		 * existing UBI device or volume, but we do not want to return
		 * any error number in this case, to indicate the fact that it
		 * could be a UBI device/volume, but it doesn't.
		 */
		errno = 0;
		return -1;
	}

	if (minor == 0)
		return 1;

	/* This is supposdely an UBI volume device node */
	sprintf(file, lib->ubi_vol, i, minor - 1);
	fd = open(file, O_RDONLY);
	if (fd == -1) {
		errno = 0;
		return -1;
	}

	return 2;
}

int ubi_get_info(libubi_t desc, struct ubi_info *info)
{
	DIR *sysfs_ubi;
	struct dirent *dirent;
	struct libubi *lib = (struct libubi *)desc;

	memset(info, '\0', sizeof(struct ubi_info));

	if (read_major(lib->ctrl_dev, &info->ctrl_major, &info->ctrl_minor)) {
		/*
		 * Older UBI versions did not have control device, so we do not
		 * panic here for compatibility reasons. May be few years later
		 * we could return -1 here, but for now just set major:minor to
		 * -1.
		 */
		info->ctrl_major = info->ctrl_minor = -1;
	}

	/*
	 * We have to scan the UBI sysfs directory to identify how many UBI
	 * devices are present.
	 */
	sysfs_ubi = opendir(lib->sysfs_ubi);
	if (!sysfs_ubi) {
		errmsg("cannot open %s", lib->sysfs_ubi);
		perror("opendir");
		return -1;
	}

	info->lowest_dev_num = INT_MAX;
	while (1) {
		int dev_num, ret;

		errno = 0;
		dirent = readdir(sysfs_ubi);
		if (!dirent)
			break;
		/*
		 * Make sure this direntry is a directory and not a symlink -
		 * Linux puts symlinks to UBI volumes on this UBI device to the
		 * same sysfs directory.
		 */
		if (!dent_is_dir(lib->sysfs_ubi, dirent->d_name))
			continue;

		ret = sscanf(dirent->d_name, UBI_DEV_NAME_PATT, &dev_num);
		if (ret == 1) {
			info->dev_count += 1;
			if (dev_num > info->highest_dev_num)
				info->highest_dev_num = dev_num;
			if (dev_num < info->lowest_dev_num)
				info->lowest_dev_num = dev_num;
		}
	}

	if (!dirent && errno) {
		errmsg("readdir failed on \"%s\"", lib->sysfs_ubi);
		perror("readdir");
		goto out_close;
	}

	if (closedir(sysfs_ubi)) {
		errmsg("closedir failed on \"%s\"", lib->sysfs_ubi);
		perror("closedir");
		return -1;
	}

	if (info->lowest_dev_num == INT_MAX)
		info->lowest_dev_num = 0;

	if (read_positive_int(lib->ubi_version, &info->version))
		return -1;

	return 0;

out_close:
	closedir(sysfs_ubi);
	return -1;
}

int ubi_mkvol(libubi_t desc, const char *node, struct ubi_mkvol_request *req)
{
	int fd, ret;
	struct ubi_mkvol_req r;
	size_t n;

	memset(&r, sizeof(struct ubi_mkvol_req), '\0');

	desc = desc;
	r.vol_id = req->vol_id;
	r.alignment = req->alignment;
	r.bytes = req->bytes;
	r.vol_type = req->vol_type;

	n = strlen(req->name);
	if (n > UBI_MAX_VOLUME_NAME)
		return -1;

	strncpy(r.name, req->name, UBI_MAX_VOLUME_NAME + 1);
	r.name_len = n;

	fd = open(node, O_RDONLY);
	if (fd == -1)
		return -1;

	ret = ioctl(fd, UBI_IOCMKVOL, &r);
	if (ret == -1)
		goto out_close;

	req->vol_id = r.vol_id;

#ifdef UDEV_SETTLE_HACK
	if (system("udevsettle") == -1)
		return -1;
#endif

out_close:
	close(fd);
	return ret;
}

int ubi_rmvol(libubi_t desc, const char *node, int vol_id)
{
	int fd, ret;

	desc = desc;
	fd = open(node, O_RDONLY);
	if (fd == -1)
		return -1;

	ret = ioctl(fd, UBI_IOCRMVOL, &vol_id);
	if (ret == -1)
		goto out_close;

#ifdef UDEV_SETTLE_HACK
	if (system("udevsettle") == -1)
		return -1;
#endif

out_close:
	close(fd);
	return ret;
}

int ubi_rsvol(libubi_t desc, const char *node, int vol_id, long long bytes)
{
	int fd, ret;
	struct ubi_rsvol_req req;

	desc = desc;
	fd = open(node, O_RDONLY);
	if (fd == -1)
		return -1;

	req.bytes = bytes;
	req.vol_id = vol_id;

	ret = ioctl(fd, UBI_IOCRSVOL, &req);
	close(fd);
	return ret;
}

int ubi_update_start(libubi_t desc, int fd, long long bytes)
{
	desc = desc;
	if (ioctl(fd, UBI_IOCVOLUP, &bytes))
		return -1;
	return 0;
}

int ubi_get_dev_info1(libubi_t desc, int dev_num, struct ubi_dev_info *info)
{
	DIR *sysfs_ubi;
	struct dirent *dirent;
	struct libubi *lib = (struct libubi *)desc;

	memset(info, '\0', sizeof(struct ubi_dev_info));
	info->dev_num = dev_num;

	sysfs_ubi = opendir(lib->sysfs_ubi);
	if (!sysfs_ubi)
		return -1;

	info->lowest_vol_num = INT_MAX;

	while (1) {
		int vol_id, ret, devno;

		errno = 0;
		dirent = readdir(sysfs_ubi);
		if (!dirent)
			break;
		ret = sscanf(dirent->d_name, UBI_VOL_NAME_PATT, &devno, &vol_id);
		if (ret == 2 && devno == dev_num) {
			info->vol_count += 1;
			if (vol_id > info->highest_vol_num)
				info->highest_vol_num = vol_id;
			if (vol_id < info->lowest_vol_num)
				info->lowest_vol_num = vol_id;
		}
	}

	if (!dirent && errno) {
		errmsg("readdir failed on \"%s\"", lib->sysfs_ubi);
		perror("readdir");
		goto out_close;
	}

	if (closedir(sysfs_ubi)) {
		errmsg("closedir failed on \"%s\"", lib->sysfs_ubi);
		perror("closedir");
		return -1;
	}

	if (info->lowest_vol_num == INT_MAX)
		info->lowest_vol_num = 0;

	if (dev_get_major(lib, dev_num, &info->major, &info->minor))
		return -1;

	if (dev_read_int(lib->dev_avail_ebs, dev_num, &info->avail_lebs))
		return -1;
	if (dev_read_int(lib->dev_total_ebs, dev_num, &info->total_lebs))
		return -1;
	if (dev_read_int(lib->dev_bad_count, dev_num, &info->bad_count))
		return -1;
	if (dev_read_int(lib->dev_eb_size, dev_num, &info->leb_size))
		return -1;
	if (dev_read_int(lib->dev_bad_rsvd, dev_num, &info->bad_rsvd))
		return -1;
	if (dev_read_ll(lib->dev_max_ec, dev_num, &info->max_ec))
		return -1;
	if (dev_read_int(lib->dev_max_vols, dev_num, &info->max_vol_count))
		return -1;
	if (dev_read_int(lib->dev_min_io_size, dev_num, &info->min_io_size))
		return -1;

	info->avail_bytes = info->avail_lebs * info->leb_size;
	info->total_bytes = info->total_lebs * info->leb_size;

	return 0;

out_close:
	closedir(sysfs_ubi);
	return -1;
}

int ubi_get_dev_info(libubi_t desc, const char *node, struct ubi_dev_info *info)
{
	int dev_num;
	struct libubi *lib = (struct libubi *)desc;

	if (dev_node2num(lib, node, &dev_num))
		return -1;

	return ubi_get_dev_info1(desc, dev_num, info);
}

int ubi_get_vol_info1(libubi_t desc, int dev_num, int vol_id,
		      struct ubi_vol_info *info)
{
	int ret;
	struct libubi *lib = (struct libubi *)desc;
	char buf[50];

	memset(info, '\0', sizeof(struct ubi_vol_info));
	info->dev_num = dev_num;
	info->vol_id = vol_id;

	if (dev_get_major(lib, dev_num, &info->dev_major, &info->dev_minor))
		return -1;
	if (vol_get_major(lib, dev_num, vol_id, &info->major, &info->minor))
		return -1;

	ret = vol_read_data(lib->vol_type, dev_num, vol_id, buf, 50);
	if (ret < 0)
		return -1;

	if (strncmp(buf, "static\n", ret) == 0)
		info->type = UBI_STATIC_VOLUME;
	else if (strncmp(buf, "dynamic\n", ret) == 0)
		info->type = UBI_DYNAMIC_VOLUME;
	else {
		errmsg("bad value at \"%s\"", buf);
		errno = EINVAL;
		return -1;
	}

	ret = vol_read_int(lib->vol_alignment, dev_num, vol_id,
			   &info->alignment);
	if (ret)
		return -1;
	ret = vol_read_ll(lib->vol_data_bytes, dev_num, vol_id,
			  &info->data_bytes);
	if (ret)
		return -1;
	ret = vol_read_int(lib->vol_rsvd_ebs, dev_num, vol_id, &info->rsvd_lebs);
	if (ret)
		return -1;
	ret = vol_read_int(lib->vol_eb_size, dev_num, vol_id, &info->leb_size);
	if (ret)
		return -1;
	ret = vol_read_int(lib->vol_corrupted, dev_num, vol_id,
			   &info->corrupted);
	if (ret)
		return -1;
	info->rsvd_bytes = info->leb_size * info->rsvd_lebs;

	ret = vol_read_data(lib->vol_name, dev_num, vol_id, &info->name,
			    UBI_VOL_NAME_MAX + 2);
	if (ret < 0)
		return -1;

	info->name[ret - 1] = '\0';
	return 0;
}

int ubi_get_vol_info(libubi_t desc, const char *node, struct ubi_vol_info *info)
{
	int vol_id, dev_num;
	struct libubi *lib = (struct libubi *)desc;

	if (vol_node2nums(lib, node, &dev_num, &vol_id))
		return -1;

	return ubi_get_vol_info1(desc, dev_num, vol_id, info);
}