aboutsummaryrefslogtreecommitdiff
path: root/ubi-utils/tests/integ.c
blob: 4da712117f875f341460764977d1e6f98f59fddf (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
#define _LARGEFILE64_SOURCE

#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>

#include <sys/ioctl.h>
#include <sys/stat.h>

#include "libubi.h"

struct erase_block_info;
struct volume_info;
struct ubi_device_info;

struct write_info
{
	struct write_info *next;
	struct erase_block_info *erase_block;
	int offset_within_block; /* Offset within erase block */
	off64_t offset; /* Offset within volume */
	int size;
	int random_seed;
};

struct erase_block_info
{
	struct volume_info *volume;
	int block_number;
	off64_t offset; /* Offset within volume */
	off64_t top_of_data;
	int touched; /* Have we done anything at all with this erase block */
	int erased; /* This erased block is currently erased */
	struct write_info *writes;
};

struct volume_fd
{
	struct volume_fd *next;
	struct volume_info *volume;
	int fd;
};

struct volume_info
{
	struct volume_info *next;
	struct ubi_device_info *ubi_device;
	struct volume_fd *fds;
	struct erase_block_info *erase_blocks;
	const char *device_file_name;
	struct ubi_vol_info info;
};

struct ubi_device_info
{
	struct volume_info *volumes;
	const char *device_file_name;
	struct ubi_dev_info info;
};

struct open_volume_fd
{
	struct open_volume_fd *next;
	struct volume_fd *vol_fd;
};

#define MAX_UBI_DEVICES 64

static libubi_t libubi;

static struct ubi_info info;
static struct ubi_device_info ubi_array[MAX_UBI_DEVICES];

static uint64_t total_written = 0;
static uint64_t total_space = 0;

static struct open_volume_fd *open_volumes;
static size_t open_volume_count = 0;

static const char *ubi_module_load_string;

static unsigned char *write_buffer = NULL;
static unsigned char *read_buffer = NULL;

static long long max_ebs_per_vol = 0; /* max number of ebs per vol (zero => no max) */

static unsigned long next_seed = 1;

static unsigned get_next_seed()
{
	next_seed = next_seed * 1103515245 + 12345;
	return ((unsigned) (next_seed / 65536) % 32768);
}

static void error_exit(const char *msg)
{
	int eno = errno;
	fprintf(stderr,"UBI Integrity Test Error: %s\n",msg);
	if (eno) {
		fprintf(stderr, "errno = %d\n", eno);
		fprintf(stderr, "strerror = %s\n", strerror(eno));
	}
	exit(1);
}

static void *allocate(size_t n)
{
	void *p = malloc(n);
	if (!p)
		error_exit("Memory allocation failure");
	memset(p, 0, n);
	return p;
}

static unsigned get_random_number(unsigned n)
{
	uint64_t r, b;

	if (n < 1)
		return 0;
	r = rand();
	r *= n;
	b = RAND_MAX;
	b += 1;
	r /= b;
	return r;
}

static struct volume_fd *open_volume(struct volume_info *vol)
{
	struct volume_fd *s;
	struct open_volume_fd *ofd;
	int fd;

	if (vol->fds) {
		/* If already open dup it */
		fd = dup(vol->fds->fd);
		if (fd == -1)
			error_exit("Failed to dup volume device file des");
	} else {
		fd = open(vol->device_file_name, O_RDWR | O_LARGEFILE);
		if (fd == -1)
			error_exit("Failed to open volume device file");
	}
	s = allocate(sizeof(*s));
	s->fd = fd;
	s->volume = vol;
	s->next = vol->fds;
	vol->fds = s;
	/* Add to open volumes list */
	ofd = allocate(sizeof(*ofd));
	ofd->vol_fd = s;
	ofd->next = open_volumes;
	open_volumes = ofd;
	open_volume_count += 1;
	return 0;
}

static void close_volume(struct volume_fd *vol_fd)
{
	struct volume_fd *vfd, *vfd_last;
	struct open_volume_fd *ofd, *ofd_last;
	int fd = vol_fd->fd;

	/* Remove from open volumes list */
	ofd_last = NULL;
	ofd = open_volumes;
	while (ofd) {
		if (ofd->vol_fd == vol_fd) {
			if (ofd_last)
				ofd_last->next = ofd->next;
			else
				open_volumes = ofd->next;
			free(ofd);
			open_volume_count -= 1;
			break;
		}
		ofd_last = ofd;
		ofd = ofd->next;
	}
	/* Remove from volume fd list */
	vfd_last = NULL;
	vfd = vol_fd->volume->fds;
	while (vfd) {
		if (vfd == vol_fd) {
			if (vfd_last)
				vfd_last->next = vfd->next;
			else
				vol_fd->volume->fds = vfd->next;
			free(vfd);
			break;
		}
		vfd_last = vfd;
		vfd = vfd->next;
	}
	/* Close volume device file */
	if (close(fd) == -1)
		error_exit("Failed to close volume file descriptor");
}

static void set_random_data(unsigned seed, unsigned char *buf, int size)
{
	int i;
	unsigned r;

	r = rand();
	srand(seed);
	for (i = 0; i < size; ++i)
		buf[i] = rand();
	srand(r);
}

#if 0
static void print_write_info(struct write_info *w)
{
	printf("Offset: %lld  Size:%d  Seed:%u\n", w->offset, w->size, w->random_seed);
	fflush(stdout);
}
#endif

static void check_erase_block(struct erase_block_info *erase_block, int fd)
{
	struct write_info *w;
	off64_t gap_end;
	int eb_size = erase_block->volume->info.eb_size;
	ssize_t bytes_read;

	w = erase_block->writes;
	gap_end = erase_block->offset + eb_size;
	while (w) {
		if (w->offset + w->size < gap_end) {
			/* There is a gap. Check all 0xff */
			off64_t gap_start = w->offset + w->size;
			size_t size = gap_end - gap_start;
			if (lseek64(fd, gap_start, SEEK_SET) != gap_start)
				error_exit("lseek64 failed");
			memset(read_buffer, 0 , size);
			errno = 0;
			bytes_read = read(fd, read_buffer, size);
			if (bytes_read != size)
				error_exit("read failed in gap");
			while (size)
				if (read_buffer[--size] != 0xff) {
					fprintf(stderr, "block no. = %d\n" , erase_block->block_number);
					fprintf(stderr, "offset = %lld\n" , (long long) gap_start);
					fprintf(stderr, "size = %ld\n" , (long) bytes_read);
					error_exit("verify 0xff failed");
				}
		}
		if (lseek64(fd, w->offset, SEEK_SET) != w->offset)
			error_exit("lseek64 failed");
		memset(read_buffer, 0 , w->size);
		errno = 0;
		bytes_read = read(fd, read_buffer, w->size);
		if (bytes_read != w->size) {
			fprintf(stderr, "offset = %lld\n" , (long long) w->offset);
			fprintf(stderr, "size = %ld\n" , (long) w->size);
			fprintf(stderr, "bytes_read = %ld\n" , (long) bytes_read);
			error_exit("read failed");
		}
		set_random_data(w->random_seed, write_buffer, w->size);
		if (memcmp(read_buffer, write_buffer, w->size))
			error_exit("verify failed");
		gap_end = w->offset;
		w = w->next;
	}
	if (gap_end > erase_block->offset) {
		/* Check all 0xff */
		off64_t gap_start = erase_block->offset;
		size_t size = gap_end - gap_start;
		if (lseek64(fd, gap_start, SEEK_SET) != gap_start)
			error_exit("lseek64 failed");
		memset(read_buffer, 0 , size);
		errno = 0;
		bytes_read = read(fd, read_buffer, size);
		if (bytes_read != size)
			error_exit("read failed in gap");
		while (size)
			if (read_buffer[--size] != 0xff) {
				fprintf(stderr, "block no. = %d\n" , erase_block->block_number);
				fprintf(stderr, "offset = %lld\n" , (long long) gap_start);
				fprintf(stderr, "size = %ld\n" , (long) bytes_read);
				error_exit("verify 0xff failed!");
			}
	}
}

static int write_to_erase_block(struct erase_block_info *erase_block, int fd)
{
	int page_size = erase_block->volume->ubi_device->info.min_io_size;
	int eb_size = erase_block->volume->info.eb_size;
	int next_offset = 0;
	int space, size;
	off64_t offset;
	unsigned seed;
	struct write_info *w;

	if (erase_block->writes)
		next_offset = erase_block->writes->offset_within_block + erase_block->writes->size;
	space = eb_size - next_offset;
	if (space <= 0)
		return 0; /* No space */
	if (!get_random_number(10)) {
		/* 1 time in 10 leave a gap */
		next_offset += get_random_number(space);
		next_offset = (next_offset / page_size) * page_size;
		space = eb_size - next_offset;
	}
	if (get_random_number(2))
		size = 1 * page_size;
	else if (get_random_number(2))
		size = 2 * page_size;
	else if (get_random_number(2))
		size = 3 * page_size;
	else if (get_random_number(2))
		size = 4 * page_size;
	else {
		if (get_random_number(4))
			size = get_random_number(space);
		else
			size = space;
		size = (size / page_size) * page_size;
	}
	if (size == 0 || size > space)
		size = page_size;
	if (next_offset + size > eb_size)
		error_exit("internal error");
	offset = erase_block->offset + next_offset;
	if (offset < erase_block->top_of_data)
		error_exit("internal error!");
	if (lseek64(fd, offset, SEEK_SET) != offset)
		error_exit("lseek64 failed");
	/* Do write */
	seed = get_next_seed();
	if (!seed)
		seed = 1;
	set_random_data(seed, write_buffer, size);
	if (write(fd, write_buffer, size) != size)
		error_exit("write failed");
	erase_block->top_of_data = offset + size;
	/* Make write info and add to eb */
	w = allocate(sizeof(*w));
	w->offset_within_block = next_offset;
	w->offset = offset;
	w->size = size;
	w->random_seed = seed;
	w->next = erase_block->writes;
	erase_block->writes = w;
	erase_block->touched = 1;
	erase_block->erased = 0;
	total_written += size;
	return 1;
}

static void erase_erase_block(struct erase_block_info *erase_block, int fd)
{
	struct write_info *w;
	uint32_t eb_no;
	int res;

	eb_no = erase_block->block_number;
	res = ioctl(fd, UBI_IOCEBER, &eb_no);
	if (res)
		error_exit("Failed to erase an erase block");
	/* Remove writes from this eb */
	while (erase_block->writes) {
		w = erase_block->writes;
		erase_block->writes = erase_block->writes->next;
		free(w);
	}
	erase_block->erased = 1;
	erase_block->touched = 1;
	erase_block->top_of_data = erase_block->offset;
}

static void operate_on_erase_block(struct erase_block_info *erase_block, int fd)
{
	/*
	Possible operations:
		read from it and verify
		write to it
		erase it
	*/
	int work_done = 1;
	static int no_work_done_count = 0;

	if (!get_random_number(10) && no_work_done_count <= 5) {
		check_erase_block(erase_block, fd);
		work_done = 0;
	} else if (get_random_number(100)) {
		if (!write_to_erase_block(erase_block, fd)) {
			/* The erase block was full */
			if (get_random_number(2) || no_work_done_count > 5)
				erase_erase_block(erase_block, fd);
			else
				work_done = 0;
		}
	} else
		erase_erase_block(erase_block, fd);
	if (work_done)
		no_work_done_count = 0;
	else
		no_work_done_count += 1;
}

static void operate_on_open_volume(struct volume_fd *vol_fd)
{
	/*
	Possible operations:
		operate on an erase block
		close volume
	*/
	if (get_random_number(100) == 0)
		close_volume(vol_fd);
	else {
		/* Pick an erase block at random */
		int eb_no = get_random_number(vol_fd->volume->info.rsvd_ebs);
		operate_on_erase_block(&vol_fd->volume->erase_blocks[eb_no], vol_fd->fd);
	}
}

static void operate_on_volume(struct volume_info *vol)
{
	/*
	Possible operations:
		open it
		resize it (must close fd's first) <- TODO
		delete it (must close fd's first) <- TODO
	*/
	open_volume(vol);
}

static int ubi_major(const char *device_file_name)
{
	struct stat buf;
	static int maj = 0;

	if (maj)
		return maj;
	if (stat(device_file_name, &buf) == -1)
		error_exit("Failed to stat ubi device file");
	maj = major(buf.st_rdev);
	return maj;
}

static void operate_on_ubi_device(struct ubi_device_info *ubi_device)
{
	/*
	TODO:
	Possible operations:
		create a new volume
		operate on existing volume
	*/
	/*
	Simplified operation (i.e. only have 1 volume):
		If there are no volumes create 1 volumne
		Then operate on the volume
	*/
	if (ubi_device->info.vol_count == 0) {
		/* Create the one-and-only volume we will use */
		char dev_name[1024];
		int i, n, maj, fd;
		struct volume_info *s;
		struct ubi_mkvol_request req;

		req.vol_id = UBI_VOL_NUM_AUTO;
		req.alignment = 1; /* TODO: What is this? */
		req.bytes = ubi_device->info.eb_size * max_ebs_per_vol;
		if (req.bytes == 0 || req.bytes > ubi_device->info.avail_bytes)
			req.bytes = ubi_device->info.avail_bytes;
		req.vol_type = UBI_DYNAMIC_VOLUME;
		req.name = "integ-test-vol";
		if (ubi_mkvol(libubi, ubi_device->device_file_name, &req))
			error_exit("ubi_mkvol failed");
		s = allocate(sizeof(*s));
		s->ubi_device = ubi_device;
		if (ubi_get_vol_info1(libubi, ubi_device->info.dev_num, req.vol_id, &s->info))
			error_exit("ubi_get_vol_info failed");
		n = s->info.rsvd_ebs;
		s->erase_blocks = allocate(sizeof(struct erase_block_info) * n);
		for (i = 0; i < n; ++i) {
			s->erase_blocks[i].volume = s;
			s->erase_blocks[i].block_number = i;
			s->erase_blocks[i].offset = i * (off64_t) s->info.eb_size;
			s->erase_blocks[i].top_of_data = s->erase_blocks[i].offset;
		}
		/* FIXME: Correctly get device file name */
		sprintf(dev_name, "%s_%d", ubi_device->device_file_name, req.vol_id);
		s->device_file_name = strdup(dev_name);
		ubi_device->volumes = s;
		ubi_device->info.vol_count += 1;
		sleep(1);
		fd = open(s->device_file_name, O_RDONLY);
		if (fd == -1) {
			/* FIXME: Correctly make node */
			maj = ubi_major(ubi_device->device_file_name);
			sprintf(dev_name, "mknod %s c %d %d", s->device_file_name, maj, req.vol_id + 1);
			system(dev_name);
		} else if (close(fd) == -1)
			error_exit("Failed to close volume device file");
	}
	operate_on_volume(ubi_device->volumes);
}

static void do_an_operation(void)
{
	int too_few = (open_volume_count < info.dev_count * 3);
	int too_many = (open_volume_count > info.dev_count * 5);

	if (too_many || (!too_few && get_random_number(1000) > 0)) {
		/* Operate on an open volume */
		size_t pos;
		struct open_volume_fd *ofd;
		pos = get_random_number(open_volume_count);
		for (ofd = open_volumes; pos && ofd && ofd->next; --pos)
			ofd = ofd->next;
		operate_on_open_volume(ofd->vol_fd);
	} else if (info.dev_count > 0) {
		/* Operate on a ubi device */
		size_t ubi_pos = 0;
		if (info.dev_count > 1)
			ubi_pos = get_random_number(info.dev_count - 1);
		operate_on_ubi_device(&ubi_array[ubi_pos]);
	} else
		error_exit("Internal error");
}

static void get_ubi_devices_info(void)
{
	int i, ubi_pos = 0;
	char dev_name[1024];
	size_t buf_size = 1024 * 128;

	if (ubi_get_info(libubi, &info))
		error_exit("ubi_get_info failed");
	if (info.dev_count > MAX_UBI_DEVICES)
		error_exit("Too many ubi devices");
	for (i = info.lowest_dev_num; i <= info.highest_dev_num; ++i) {
		struct ubi_device_info *s;
		s = &ubi_array[ubi_pos++];
		if (ubi_get_dev_info1(libubi, i, &s->info))
			error_exit("ubi_get_dev_info1 failed");
		if (s->info.vol_count)
			error_exit("There are existing volumes");
		/* FIXME: Correctly get device file name */
		sprintf(dev_name, "/dev/ubi%d", i);
		s->device_file_name = strdup(dev_name);
		if (buf_size < s->info.eb_size)
			buf_size = s->info.eb_size;
		if (max_ebs_per_vol && s->info.eb_size * max_ebs_per_vol < s->info.avail_bytes)
			total_space += s->info.eb_size * max_ebs_per_vol;
		else
			total_space += s->info.avail_bytes;
	}
	write_buffer = allocate(buf_size);
	read_buffer = allocate(buf_size);
}

static void load_ubi(void)
{
	system("rmmod ubi");
	if (system(ubi_module_load_string) != 0)
		error_exit("Failed to load UBI module");
	sleep(1);
}

static void do_some_operations(void)
{
	unsigned i = 0;
	total_written = 0;
	printf("Total space: %llu\n", (unsigned long long) total_space);
	while (total_written < total_space * 3) {
		do_an_operation();
		if (i++ % 10000 == 0)
			printf("Total written: %llu\n", (unsigned long long) total_written);
	}
	printf("Total written: %llu\n", (unsigned long long) total_written);
}

static void reload_ubi(void)
{
	/* Remove module */
	if (system("rmmod ubi") != 0)
		error_exit("Failed to remove UBI module");
	/* Install module */
	if (system(ubi_module_load_string) != 0)
		error_exit("Failed to load UBI module");
	sleep(1);
}

static void check_volume(struct volume_info *vol)
{
	struct erase_block_info *eb = vol->erase_blocks;
	int pos;
	int fd;

	fd = open(vol->device_file_name, O_RDWR | O_LARGEFILE);
	if (fd == -1)
		error_exit("Failed to open volume device file");
	for (pos = 0; pos < vol->info.rsvd_ebs; ++pos)
		check_erase_block(eb++, fd);
	if (close(fd) == -1)
		error_exit("Failed to close volume device file");
}

static void check_ubi_device(struct ubi_device_info *ubi_device)
{
	struct volume_info *vol;

	vol = ubi_device->volumes;
	while (vol) {
		check_volume(vol);
		vol = vol->next;
	}
}

static void check_ubi(void)
{
	int i;

	for (i = 0; i < info.dev_count; ++i)
		check_ubi_device(&ubi_array[i]);
}

static int is_all_digits(const char *s)
{
	const char *digits = "0123456789";
	if (!s || !*s)
		return 0;
	for (;*s;++s)
		if (!strchr(digits,*s))
			return 0;
	return 1;
}

static int get_short_arg(int *pos,const char *name,long long *result,int argc,char *argv[])
{
	const char *p = NULL;
	int i = *pos;
	size_t n = strlen(name);

	if (strlen(argv[i]) > n)
		p = argv[i] + n;
	else if (++i < argc)
		p = argv[i];
	if (!is_all_digits(p))
		return 1;
	*result = atoll(p);
	*pos = i;
	return 0;
}

static int get_long_arg(int *pos,const char *name,long long *result,int argc,char *argv[])
{
	const char *p = NULL;
	int i = *pos;
	size_t n = strlen(name);

	if (strlen(argv[i]) > n)
		p = argv[i] + n;
	else if (++i < argc)
		p = argv[i];
	if (p && *p == '=') {
		p += 1;
		if (!*p && ++i < argc)
			p = argv[i];
	}
	if (!is_all_digits(p))
		return 1;
	*result = atoll(p);
	*pos = i;
	return 0;
}

static int remove_all_volumes(void)
{
	int i;

	for (i = 0; i < info.dev_count; ++i) {
		struct ubi_device_info *ubi_device = &ubi_array[i];
		struct volume_info *vol;
		vol = ubi_device->volumes;
		while (vol) {
			int res = ubi_rmvol(libubi,
					    ubi_device->device_file_name,
					    vol->info.vol_id);
			if (res)
				return res;
			vol = vol->next;
		}
	}
	return 0;
}

int main(int argc,char *argv[])
{
	int i;
	long long r, repeat = 1;
	int initial_seed = 1, args_ok = 1;

	printf("UBI Integrity Test\n");

	/* Get arguments */
	ubi_module_load_string = 0;
	for (i = 1; i < argc; ++i) {
		if (strncmp(argv[i], "-h", 2) == 0)
			args_ok = 0;
		else if (strncmp(argv[i], "--help", 6) == 0)
			args_ok = 0;
		else if (strncmp(argv[i], "-n", 2) == 0) {
			if (get_short_arg(&i, "-n", &repeat, argc, argv))
				args_ok = 0;
		} else if (strncmp(argv[i], "--repeat", 8) == 0) {
			if (get_long_arg(&i, "--repeat", &repeat, argc, argv))
				args_ok = 0;
		} else if (strncmp(argv[i], "-m", 2) == 0) {
			if (get_short_arg(&i,"-m", &max_ebs_per_vol, argc, argv))
				args_ok = 0;
		} else if (strncmp(argv[i], "--maxebs", 8) == 0) {
			if (get_long_arg(&i, "--maxebs", &max_ebs_per_vol, argc, argv))
				args_ok = 0;
		} else if (!ubi_module_load_string)
			ubi_module_load_string = argv[i];
		else
			args_ok = 0;
	}
	if (!args_ok || !ubi_module_load_string) {
		fprintf(stderr, "Usage is: ubi_integ [<options>] <UBI Module load command>\n");
		fprintf(stderr, "    Options: \n");
		fprintf(stderr, "        -h, --help              Help\n");
		fprintf(stderr, "        -n arg, --repeat=arg    Repeat test arg times\n");
		fprintf(stderr, "        -m arg, --maxebs=arg    Max no. of erase blocks\n");
		return 1;
	}

	initial_seed = getpid();
	printf("Initial seed = %u\n", (unsigned) initial_seed);
	next_seed = initial_seed;
	srand(initial_seed);
	load_ubi();

	libubi = libubi_open();
	if (!libubi)
		error_exit("Failed to open libubi");

	get_ubi_devices_info();

	r = 0;
	while (repeat == 0 || r++ < repeat) {
		printf("Cycle %lld\n", r);
		do_some_operations();

		/* Close all volumes */
		while (open_volumes)
			close_volume(open_volumes->vol_fd);

		check_ubi();

		libubi_close(libubi);

		reload_ubi();

		libubi = libubi_open();
		if (!libubi)
			error_exit("Failed to open libubi");

		check_ubi();
	}

	if (remove_all_volumes())
		error_exit("Failed to remove all volumes");

	libubi_close(libubi);

	printf("UBI Integrity Test completed ok\n");
	return 0;
}