summaryrefslogtreecommitdiff
path: root/drivers/mtd/ubispl/ubispl.c
blob: a81a8e715da19358b4d5ebc6d03dc3cb8dea0a77 (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
/*
 * Copyright (c) Thomas Gleixner <tglx@linutronix.de>
 *
 * The parts taken from the kernel implementation are:
 *
 * Copyright (c) International Business Machines Corp., 2006
 *
 * SPDX-License-Identifier: GPL 2.0+ BSD-3-Clause
 */

#include <common.h>
#include <errno.h>
#include <ubispl.h>

#include <linux/crc32.h>

#include "ubispl.h"

/**
 * ubi_calc_fm_size - calculates the fastmap size in bytes for an UBI device.
 * @ubi: UBI device description object
 */
static size_t ubi_calc_fm_size(struct ubi_scan_info *ubi)
{
	size_t size;

	size = sizeof(struct ubi_fm_sb) +
		sizeof(struct ubi_fm_hdr) +
		sizeof(struct ubi_fm_scan_pool) +
		sizeof(struct ubi_fm_scan_pool) +
		(ubi->peb_count * sizeof(struct ubi_fm_ec)) +
		(sizeof(struct ubi_fm_eba) +
		(ubi->peb_count * sizeof(__be32))) +
		sizeof(struct ubi_fm_volhdr) * UBI_MAX_VOLUMES;
	return roundup(size, ubi->leb_size);
}

static int ubi_io_read(struct ubi_scan_info *ubi, void *buf, int pnum,
		       unsigned long from, unsigned long len)
{
	return ubi->read(pnum + ubi->peb_offset, from, len, buf);
}

static int ubi_io_is_bad(struct ubi_scan_info *ubi, int peb)
{
	return peb >= ubi->peb_count || peb < 0;
}

static int ubi_io_read_vid_hdr(struct ubi_scan_info *ubi, int pnum,
			       struct ubi_vid_hdr *vh, int unused)
{
	u32 magic;
	int res;

	/* No point in rescanning a corrupt block */
	if (test_bit(pnum, ubi->corrupt))
		return UBI_IO_BAD_HDR;
	/*
	 * If the block has been scanned already, no need to rescan
	 */
	if (test_and_set_bit(pnum, ubi->scanned))
		return 0;

	res = ubi_io_read(ubi, vh, pnum, ubi->vid_offset, sizeof(*vh));

	/*
	 * Bad block, unrecoverable ECC error, skip the block
	 */
	if (res) {
		ubi_dbg("Skipping bad or unreadable block %d", pnum);
		vh->magic = 0;
		generic_set_bit(pnum, ubi->corrupt);
		return res;
	}

	/* Magic number available ? */
	magic = be32_to_cpu(vh->magic);
	if (magic != UBI_VID_HDR_MAGIC) {
		generic_set_bit(pnum, ubi->corrupt);
		if (magic == 0xffffffff)
			return UBI_IO_FF;
		ubi_msg("Bad magic in block 0%d %08x", pnum, magic);
		return UBI_IO_BAD_HDR;
	}

	/* Header CRC correct ? */
	if (crc32(UBI_CRC32_INIT, vh, UBI_VID_HDR_SIZE_CRC) !=
	    be32_to_cpu(vh->hdr_crc)) {
		ubi_msg("Bad CRC in block 0%d", pnum);
		generic_set_bit(pnum, ubi->corrupt);
		return UBI_IO_BAD_HDR;
	}

	ubi_dbg("RV: pnum: %i sqnum %llu", pnum, be64_to_cpu(vh->sqnum));

	return 0;
}

static int ubi_rescan_fm_vid_hdr(struct ubi_scan_info *ubi,
				 struct ubi_vid_hdr *vh,
				 u32 fm_pnum, u32 fm_vol_id, u32 fm_lnum)
{
	int res;

	if (ubi_io_is_bad(ubi, fm_pnum))
		return -EINVAL;

	res = ubi_io_read_vid_hdr(ubi, fm_pnum, vh, 0);
	if (!res) {
		/* Check volume id, volume type and lnum */
		if (be32_to_cpu(vh->vol_id) == fm_vol_id &&
		    vh->vol_type == UBI_VID_STATIC &&
		    be32_to_cpu(vh->lnum) == fm_lnum)
			return 0;
		ubi_dbg("RS: PEB %u vol: %u : %u typ %u lnum %u %u",
			fm_pnum, fm_vol_id, vh->vol_type,
			be32_to_cpu(vh->vol_id),
			fm_lnum, be32_to_cpu(vh->lnum));
	}
	return res;
}

/* Insert the logic block into the volume info */
static int ubi_add_peb_to_vol(struct ubi_scan_info *ubi,
			      struct ubi_vid_hdr *vh, u32 vol_id,
			      u32 pnum, u32 lnum)
{
	struct ubi_vol_info *vi = ubi->volinfo + vol_id;
	u32 *ltp;

	/*
	 * If the volume is larger than expected, yell and give up :(
	 */
	if (lnum >= UBI_MAX_VOL_LEBS) {
		ubi_warn("Vol: %u LEB %d > %d", vol_id, lnum, UBI_MAX_VOL_LEBS);
		return -EINVAL;
	}

	ubi_dbg("SC: Add PEB %u to Vol %u as LEB %u fnd %d sc %d",
		pnum, vol_id, lnum, !!test_bit(lnum, vi->found),
		!!test_bit(pnum, ubi->scanned));

	/* Points to the translation entry */
	ltp = vi->lebs_to_pebs + lnum;

	/* If the block is already assigned, check sqnum */
	if (__test_and_set_bit(lnum, vi->found)) {
		u32 cur_pnum = *ltp;
		struct ubi_vid_hdr *cur = ubi->blockinfo + cur_pnum;

		/*
		 * If the current block hase not yet been scanned, we
		 * need to do that. The other block might be stale or
		 * the current block corrupted and the FM not yet
		 * updated.
		 */
		if (!test_bit(cur_pnum, ubi->scanned)) {
			/*
			 * If the scan fails, we use the valid block
			 */
			if (ubi_rescan_fm_vid_hdr(ubi, cur, cur_pnum, vol_id,
						  lnum)) {
				*ltp = pnum;
				return 0;
			}
		}

		/*
		 * Should not happen ....
		 */
		if (test_bit(cur_pnum, ubi->corrupt)) {
			*ltp = pnum;
			return 0;
		}

		ubi_dbg("Vol %u LEB %u PEB %u->sqnum %llu NPEB %u->sqnum %llu",
			vol_id, lnum, cur_pnum, be64_to_cpu(cur->sqnum), pnum,
			be64_to_cpu(vh->sqnum));

		/*
		 * Compare sqnum and take the newer one
		 */
		if (be64_to_cpu(cur->sqnum) < be64_to_cpu(vh->sqnum))
			*ltp = pnum;
	} else {
		*ltp = pnum;
		if (lnum > vi->last_block)
			vi->last_block = lnum;
	}

	return 0;
}

static int ubi_scan_vid_hdr(struct ubi_scan_info *ubi, struct ubi_vid_hdr *vh,
			    u32 pnum)
{
	u32 vol_id, lnum;
	int res;

	if (ubi_io_is_bad(ubi, pnum))
		return -EINVAL;

	res = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
	if (res)
		return res;

	/* Get volume id */
	vol_id = be32_to_cpu(vh->vol_id);

	/* If this is the fastmap anchor, return right away */
	if (vol_id == UBI_FM_SB_VOLUME_ID)
		return ubi->fm_enabled ? UBI_FASTMAP_ANCHOR : 0;

	/* We only care about static volumes with an id < UBI_SPL_VOL_IDS */
	if (vol_id >= UBI_SPL_VOL_IDS || vh->vol_type != UBI_VID_STATIC)
		return 0;

	/* We are only interested in the volumes to load */
	if (!test_bit(vol_id, ubi->toload))
		return 0;

	lnum = be32_to_cpu(vh->lnum);
	return ubi_add_peb_to_vol(ubi, vh, vol_id, pnum, lnum);
}

static int assign_aeb_to_av(struct ubi_scan_info *ubi, u32 pnum, u32 lnum,
			     u32 vol_id, u32 vol_type, u32 used)
{
	struct ubi_vid_hdr *vh;

	if (ubi_io_is_bad(ubi, pnum))
		return -EINVAL;

	ubi->fastmap_pebs++;

	if (vol_id >= UBI_SPL_VOL_IDS || vol_type != UBI_STATIC_VOLUME)
		return 0;

	/* We are only interested in the volumes to load */
	if (!test_bit(vol_id, ubi->toload))
		return 0;

	vh = ubi->blockinfo + pnum;

	return ubi_scan_vid_hdr(ubi, vh, pnum);
}

static int scan_pool(struct ubi_scan_info *ubi, __be32 *pebs, int pool_size)
{
	struct ubi_vid_hdr *vh;
	u32 pnum;
	int i;

	ubi_dbg("Scanning pool size: %d", pool_size);

	for (i = 0; i < pool_size; i++) {
		pnum = be32_to_cpu(pebs[i]);

		if (ubi_io_is_bad(ubi, pnum)) {
			ubi_err("FM: Bad PEB in fastmap pool! %u", pnum);
			return UBI_BAD_FASTMAP;
		}

		vh = ubi->blockinfo + pnum;
		/*
		 * We allow the scan to fail here. The loader will notice
		 * and look for a replacement.
		 */
		ubi_scan_vid_hdr(ubi, vh, pnum);
	}
	return 0;
}

/*
 * Fastmap code is stolen from Linux kernel and this stub structure is used
 * to make it happy.
 */
struct ubi_attach_info {
	int i;
};

static int ubi_attach_fastmap(struct ubi_scan_info *ubi,
			      struct ubi_attach_info *ai,
			      struct ubi_fastmap_layout *fm)
{
	struct ubi_fm_hdr *fmhdr;
	struct ubi_fm_scan_pool *fmpl1, *fmpl2;
	struct ubi_fm_ec *fmec;
	struct ubi_fm_volhdr *fmvhdr;
	struct ubi_fm_eba *fm_eba;
	int ret, i, j, pool_size, wl_pool_size;
	size_t fm_pos = 0, fm_size = ubi->fm_size;
	void *fm_raw = ubi->fm_buf;

	memset(ubi->fm_used, 0, sizeof(ubi->fm_used));

	fm_pos += sizeof(struct ubi_fm_sb);
	if (fm_pos >= fm_size)
		goto fail_bad;

	fmhdr = (struct ubi_fm_hdr *)(fm_raw + fm_pos);
	fm_pos += sizeof(*fmhdr);
	if (fm_pos >= fm_size)
		goto fail_bad;

	if (be32_to_cpu(fmhdr->magic) != UBI_FM_HDR_MAGIC) {
		ubi_err("bad fastmap header magic: 0x%x, expected: 0x%x",
			be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC);
		goto fail_bad;
	}

	fmpl1 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
	fm_pos += sizeof(*fmpl1);
	if (fm_pos >= fm_size)
		goto fail_bad;
	if (be32_to_cpu(fmpl1->magic) != UBI_FM_POOL_MAGIC) {
		ubi_err("bad fastmap pool magic: 0x%x, expected: 0x%x",
			be32_to_cpu(fmpl1->magic), UBI_FM_POOL_MAGIC);
		goto fail_bad;
	}

	fmpl2 = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
	fm_pos += sizeof(*fmpl2);
	if (fm_pos >= fm_size)
		goto fail_bad;
	if (be32_to_cpu(fmpl2->magic) != UBI_FM_POOL_MAGIC) {
		ubi_err("bad fastmap pool magic: 0x%x, expected: 0x%x",
			be32_to_cpu(fmpl2->magic), UBI_FM_POOL_MAGIC);
		goto fail_bad;
	}

	pool_size = be16_to_cpu(fmpl1->size);
	wl_pool_size = be16_to_cpu(fmpl2->size);
	fm->max_pool_size = be16_to_cpu(fmpl1->max_size);
	fm->max_wl_pool_size = be16_to_cpu(fmpl2->max_size);

	if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) {
		ubi_err("bad pool size: %i", pool_size);
		goto fail_bad;
	}

	if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) {
		ubi_err("bad WL pool size: %i", wl_pool_size);
		goto fail_bad;
	}

	if (fm->max_pool_size > UBI_FM_MAX_POOL_SIZE ||
	    fm->max_pool_size < 0) {
		ubi_err("bad maximal pool size: %i", fm->max_pool_size);
		goto fail_bad;
	}

	if (fm->max_wl_pool_size > UBI_FM_MAX_POOL_SIZE ||
	    fm->max_wl_pool_size < 0) {
		ubi_err("bad maximal WL pool size: %i", fm->max_wl_pool_size);
		goto fail_bad;
	}

	/* read EC values from free list */
	for (i = 0; i < be32_to_cpu(fmhdr->free_peb_count); i++) {
		fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
		fm_pos += sizeof(*fmec);
		if (fm_pos >= fm_size)
			goto fail_bad;
	}

	/* read EC values from used list */
	for (i = 0; i < be32_to_cpu(fmhdr->used_peb_count); i++) {
		fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
		fm_pos += sizeof(*fmec);
		if (fm_pos >= fm_size)
			goto fail_bad;

		generic_set_bit(be32_to_cpu(fmec->pnum), ubi->fm_used);
	}

	/* read EC values from scrub list */
	for (i = 0; i < be32_to_cpu(fmhdr->scrub_peb_count); i++) {
		fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
		fm_pos += sizeof(*fmec);
		if (fm_pos >= fm_size)
			goto fail_bad;
	}

	/* read EC values from erase list */
	for (i = 0; i < be32_to_cpu(fmhdr->erase_peb_count); i++) {
		fmec = (struct ubi_fm_ec *)(fm_raw + fm_pos);
		fm_pos += sizeof(*fmec);
		if (fm_pos >= fm_size)
			goto fail_bad;
	}

	/* Iterate over all volumes and read their EBA table */
	for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) {
		u32 vol_id, vol_type, used, reserved;

		fmvhdr = (struct ubi_fm_volhdr *)(fm_raw + fm_pos);
		fm_pos += sizeof(*fmvhdr);
		if (fm_pos >= fm_size)
			goto fail_bad;

		if (be32_to_cpu(fmvhdr->magic) != UBI_FM_VHDR_MAGIC) {
			ubi_err("bad fastmap vol header magic: 0x%x, " \
				"expected: 0x%x",
				be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC);
			goto fail_bad;
		}

		vol_id = be32_to_cpu(fmvhdr->vol_id);
		vol_type = fmvhdr->vol_type;
		used = be32_to_cpu(fmvhdr->used_ebs);

		fm_eba = (struct ubi_fm_eba *)(fm_raw + fm_pos);
		fm_pos += sizeof(*fm_eba);
		fm_pos += (sizeof(__be32) * be32_to_cpu(fm_eba->reserved_pebs));
		if (fm_pos >= fm_size)
			goto fail_bad;

		if (be32_to_cpu(fm_eba->magic) != UBI_FM_EBA_MAGIC) {
			ubi_err("bad fastmap EBA header magic: 0x%x, " \
				"expected: 0x%x",
				be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC);
			goto fail_bad;
		}

		reserved = be32_to_cpu(fm_eba->reserved_pebs);
		ubi_dbg("FA: vol %u used %u res: %u", vol_id, used, reserved);
		for (j = 0; j < reserved; j++) {
			int pnum = be32_to_cpu(fm_eba->pnum[j]);

			if ((int)be32_to_cpu(fm_eba->pnum[j]) < 0)
				continue;

			if (!__test_and_clear_bit(pnum, ubi->fm_used))
				continue;

			/*
			 * We only handle static volumes so used_ebs
			 * needs to be handed in. And we do not assign
			 * the reserved blocks
			 */
			if (j >= used)
				continue;

			ret = assign_aeb_to_av(ubi, pnum, j, vol_id,
					       vol_type, used);
			if (!ret)
				continue;

			/*
			 * Nasty: The fastmap claims that the volume
			 * has one block more than it, but that block
			 * is always empty and the other blocks have
			 * the correct number of total LEBs in the
			 * headers. Deal with it.
			 */
			if (ret != UBI_IO_FF && j != used - 1)
				goto fail_bad;
			ubi_dbg("FA: Vol: %u Ignoring empty LEB %d of %d",
				vol_id, j, used);
		}
	}

	ret = scan_pool(ubi, fmpl1->pebs, pool_size);
	if (ret)
		goto fail;

	ret = scan_pool(ubi, fmpl2->pebs, wl_pool_size);
	if (ret)
		goto fail;

#ifdef CHECKME
	/*
	 * If fastmap is leaking PEBs (must not happen), raise a
	 * fat warning and fall back to scanning mode.
	 * We do this here because in ubi_wl_init() it's too late
	 * and we cannot fall back to scanning.
	 */
	if (WARN_ON(count_fastmap_pebs(ai) != ubi->peb_count -
		    ai->bad_peb_count - fm->used_blocks))
		goto fail_bad;
#endif

	return 0;

fail_bad:
	ret = UBI_BAD_FASTMAP;
fail:
	return ret;
}

static int ubi_scan_fastmap(struct ubi_scan_info *ubi,
			    struct ubi_attach_info *ai,
			    int fm_anchor)
{
	struct ubi_fm_sb *fmsb, *fmsb2;
	struct ubi_vid_hdr *vh;
	struct ubi_fastmap_layout *fm;
	int i, used_blocks, pnum, ret = 0;
	size_t fm_size;
	__be32 crc, tmp_crc;
	unsigned long long sqnum = 0;

	fmsb = &ubi->fm_sb;
	fm = &ubi->fm_layout;

	ret = ubi_io_read(ubi, fmsb, fm_anchor, ubi->leb_start, sizeof(*fmsb));
	if (ret && ret != UBI_IO_BITFLIPS)
		goto free_fm_sb;
	else if (ret == UBI_IO_BITFLIPS)
		fm->to_be_tortured[0] = 1;

	if (be32_to_cpu(fmsb->magic) != UBI_FM_SB_MAGIC) {
		ubi_err("bad super block magic: 0x%x, expected: 0x%x",
			be32_to_cpu(fmsb->magic), UBI_FM_SB_MAGIC);
		ret = UBI_BAD_FASTMAP;
		goto free_fm_sb;
	}

	if (fmsb->version != UBI_FM_FMT_VERSION) {
		ubi_err("bad fastmap version: %i, expected: %i",
			fmsb->version, UBI_FM_FMT_VERSION);
		ret = UBI_BAD_FASTMAP;
		goto free_fm_sb;
	}

	used_blocks = be32_to_cpu(fmsb->used_blocks);
	if (used_blocks > UBI_FM_MAX_BLOCKS || used_blocks < 1) {
		ubi_err("number of fastmap blocks is invalid: %i", used_blocks);
		ret = UBI_BAD_FASTMAP;
		goto free_fm_sb;
	}

	fm_size = ubi->leb_size * used_blocks;
	if (fm_size != ubi->fm_size) {
		ubi_err("bad fastmap size: %zi, expected: %zi", fm_size,
			ubi->fm_size);
		ret = UBI_BAD_FASTMAP;
		goto free_fm_sb;
	}

	vh = &ubi->fm_vh;

	for (i = 0; i < used_blocks; i++) {
		pnum = be32_to_cpu(fmsb->block_loc[i]);

		if (ubi_io_is_bad(ubi, pnum)) {
			ret = UBI_BAD_FASTMAP;
			goto free_hdr;
		}

#ifdef LATER
		int image_seq;
		ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
		if (ret && ret != UBI_IO_BITFLIPS) {
			ubi_err("unable to read fastmap block# %i EC (PEB: %i)",
				i, pnum);
			if (ret > 0)
				ret = UBI_BAD_FASTMAP;
			goto free_hdr;
		} else if (ret == UBI_IO_BITFLIPS)
			fm->to_be_tortured[i] = 1;

		image_seq = be32_to_cpu(ech->image_seq);
		if (!ubi->image_seq)
			ubi->image_seq = image_seq;
		/*
		 * Older UBI implementations have image_seq set to zero, so
		 * we shouldn't fail if image_seq == 0.
		 */
		if (image_seq && (image_seq != ubi->image_seq)) {
			ubi_err("wrong image seq:%d instead of %d",
				be32_to_cpu(ech->image_seq), ubi->image_seq);
			ret = UBI_BAD_FASTMAP;
			goto free_hdr;
		}
#endif
		ret = ubi_io_read_vid_hdr(ubi, pnum, vh, 0);
		if (ret && ret != UBI_IO_BITFLIPS) {
			ubi_err("unable to read fastmap block# %i (PEB: %i)",
				i, pnum);
			goto free_hdr;
		}

		/*
		 * Mainline code rescans the anchor header. We've done
		 * that already so we merily copy it over.
		 */
		if (pnum == fm_anchor)
			memcpy(vh, ubi->blockinfo + pnum, sizeof(*fm));

		if (i == 0) {
			if (be32_to_cpu(vh->vol_id) != UBI_FM_SB_VOLUME_ID) {
				ubi_err("bad fastmap anchor vol_id: 0x%x," \
					" expected: 0x%x",
					be32_to_cpu(vh->vol_id),
					UBI_FM_SB_VOLUME_ID);
				ret = UBI_BAD_FASTMAP;
				goto free_hdr;
			}
		} else {
			if (be32_to_cpu(vh->vol_id) != UBI_FM_DATA_VOLUME_ID) {
				ubi_err("bad fastmap data vol_id: 0x%x," \
					" expected: 0x%x",
					be32_to_cpu(vh->vol_id),
					UBI_FM_DATA_VOLUME_ID);
				ret = UBI_BAD_FASTMAP;
				goto free_hdr;
			}
		}

		if (sqnum < be64_to_cpu(vh->sqnum))
			sqnum = be64_to_cpu(vh->sqnum);

		ret = ubi_io_read(ubi, ubi->fm_buf + (ubi->leb_size * i), pnum,
				  ubi->leb_start, ubi->leb_size);
		if (ret && ret != UBI_IO_BITFLIPS) {
			ubi_err("unable to read fastmap block# %i (PEB: %i, " \
				"err: %i)", i, pnum, ret);
			goto free_hdr;
		}
	}

	fmsb2 = (struct ubi_fm_sb *)(ubi->fm_buf);
	tmp_crc = be32_to_cpu(fmsb2->data_crc);
	fmsb2->data_crc = 0;
	crc = crc32(UBI_CRC32_INIT, ubi->fm_buf, fm_size);
	if (crc != tmp_crc) {
		ubi_err("fastmap data CRC is invalid");
		ubi_err("CRC should be: 0x%x, calc: 0x%x", tmp_crc, crc);
		ret = UBI_BAD_FASTMAP;
		goto free_hdr;
	}

	fmsb2->sqnum = sqnum;

	fm->used_blocks = used_blocks;

	ret = ubi_attach_fastmap(ubi, ai, fm);
	if (ret) {
		if (ret > 0)
			ret = UBI_BAD_FASTMAP;
		goto free_hdr;
	}

	ubi->fm = fm;
	ubi->fm_pool.max_size = ubi->fm->max_pool_size;
	ubi->fm_wl_pool.max_size = ubi->fm->max_wl_pool_size;
	ubi_msg("attached by fastmap %uMB %u blocks",
		ubi->fsize_mb, ubi->peb_count);
	ubi_dbg("fastmap pool size: %d", ubi->fm_pool.max_size);
	ubi_dbg("fastmap WL pool size: %d", ubi->fm_wl_pool.max_size);

out:
	if (ret)
		ubi_err("Attach by fastmap failed, doing a full scan!");
	return ret;

free_hdr:
free_fm_sb:
	goto out;
}

/*
 * Scan the flash and attempt to attach via fastmap
 */
static void ipl_scan(struct ubi_scan_info *ubi)
{
	unsigned int pnum;
	int res;

	/*
	 * Scan first for the fastmap super block
	 */
	for (pnum = 0; pnum < UBI_FM_MAX_START; pnum++) {
		res = ubi_scan_vid_hdr(ubi, ubi->blockinfo + pnum, pnum);
		/*
		 * We ignore errors here as we are meriliy scanning
		 * the headers.
		 */
		if (res != UBI_FASTMAP_ANCHOR)
			continue;

		/*
		 * If fastmap is disabled, continue scanning. This
		 * might happen because the previous attempt failed or
		 * the caller disabled it right away.
		 */
		if (!ubi->fm_enabled)
			continue;

		/*
		 * Try to attach the fastmap, if that fails continue
		 * scanning.
		 */
		if (!ubi_scan_fastmap(ubi, NULL, pnum))
			return;
		/*
		 * Fastmap failed. Clear everything we have and start
		 * over. We are paranoid and do not trust anything.
		 */
		memset(ubi->volinfo, 0, sizeof(ubi->volinfo));
		pnum = 0;
		break;
	}

	/*
	 * Continue scanning, ignore errors, we might find what we are
	 * looking for,
	 */
	for (; pnum < ubi->peb_count; pnum++)
		ubi_scan_vid_hdr(ubi, ubi->blockinfo + pnum, pnum);
}

/*
 * Load a logical block of a volume into memory
 */
static int ubi_load_block(struct ubi_scan_info *ubi, uint8_t *laddr,
			  struct ubi_vol_info *vi, u32 vol_id, u32 lnum,
			  u32 last)
{
	struct ubi_vid_hdr *vh, *vrepl;
	u32 pnum, crc, dlen;

retry:
	/*
	 * If this is a fastmap run, we try to rescan full, otherwise
	 * we simply give up.
	 */
	if (!test_bit(lnum, vi->found)) {
		ubi_warn("LEB %d of %d is missing", lnum, last);
		return -EINVAL;
	}

	pnum = vi->lebs_to_pebs[lnum];

	ubi_dbg("Load vol %u LEB %u PEB %u", vol_id, lnum, pnum);

	if (ubi_io_is_bad(ubi, pnum)) {
		ubi_warn("Corrupted mapping block %d PB %d\n", lnum, pnum);
		return -EINVAL;
	}

	if (test_bit(pnum, ubi->corrupt))
		goto find_other;

	/*
	 * Lets try to read that block
	 */
	vh = ubi->blockinfo + pnum;

	if (!test_bit(pnum, ubi->scanned)) {
		ubi_warn("Vol: %u LEB %u PEB %u not yet scanned", vol_id,
			 lnum, pnum);
		if (ubi_rescan_fm_vid_hdr(ubi, vh, pnum, vol_id, lnum))
			goto find_other;
	}

	/*
	 * Check, if the total number of blocks is correct
	 */
	if (be32_to_cpu(vh->used_ebs) != last) {
		ubi_dbg("Block count missmatch.");
		ubi_dbg("vh->used_ebs: %d nrblocks: %d",
			be32_to_cpu(vh->used_ebs), last);
		generic_set_bit(pnum, ubi->corrupt);
		goto find_other;
	}

	/*
	 * Get the data length of this block.
	 */
	dlen = be32_to_cpu(vh->data_size);

	/*
	 * Read the data into RAM. We ignore the return value
	 * here as the only thing which might go wrong are
	 * bitflips. Try nevertheless.
	 */
	ubi_io_read(ubi, laddr, pnum, ubi->leb_start, dlen);

	/* Calculate CRC over the data */
	crc = crc32(UBI_CRC32_INIT, laddr, dlen);

	if (crc != be32_to_cpu(vh->data_crc)) {
		ubi_warn("Vol: %u LEB %u PEB %u data CRC failure", vol_id,
			 lnum, pnum);
		generic_set_bit(pnum, ubi->corrupt);
		goto find_other;
	}

	/* We are good. Return the data length we read */
	return dlen;

find_other:
	ubi_dbg("Find replacement for LEB %u PEB %u", lnum, pnum);
	generic_clear_bit(lnum, vi->found);
	vrepl = NULL;

	for (pnum = 0; pnum < ubi->peb_count; pnum++) {
		struct ubi_vid_hdr *tmp = ubi->blockinfo + pnum;
		u32 t_vol_id = be32_to_cpu(tmp->vol_id);
		u32 t_lnum = be32_to_cpu(tmp->lnum);

		if (test_bit(pnum, ubi->corrupt))
			continue;

		if (t_vol_id != vol_id || t_lnum != lnum)
			continue;

		if (!test_bit(pnum, ubi->scanned)) {
			ubi_warn("Vol: %u LEB %u PEB %u not yet scanned",
				 vol_id, lnum, pnum);
			if (ubi_rescan_fm_vid_hdr(ubi, tmp, pnum, vol_id, lnum))
				continue;
		}

		/*
		 * We found one. If its the first, assign it otherwise
		 * compare the sqnum
		 */
		generic_set_bit(lnum, vi->found);

		if (!vrepl) {
			vrepl = tmp;
			continue;
		}

		if (be64_to_cpu(vrepl->sqnum) < be64_to_cpu(tmp->sqnum))
			vrepl = tmp;
	}

	if (vrepl) {
		/* Update the vi table */
		pnum = vrepl - ubi->blockinfo;
		vi->lebs_to_pebs[lnum] = pnum;
		ubi_dbg("Trying PEB %u for LEB %u", pnum, lnum);
		vh = vrepl;
	}
	goto retry;
}

/*
 * Load a volume into RAM
 */
static int ipl_load(struct ubi_scan_info *ubi, const u32 vol_id, uint8_t *laddr)
{
	struct ubi_vol_info *vi;
	u32 lnum, last, len;

	if (vol_id >= UBI_SPL_VOL_IDS)
		return -EINVAL;

	len = 0;
	vi = ubi->volinfo + vol_id;
	last = vi->last_block + 1;

	/* Read the blocks to RAM, check CRC */
	for (lnum = 0 ; lnum < last; lnum++) {
		int res = ubi_load_block(ubi, laddr, vi, vol_id, lnum, last);

		if (res < 0) {
			ubi_warn("Failed to load volume %u", vol_id);
			return res;
		}
		/* res is the data length of the read block */
		laddr += res;
		len += res;
	}
	return len;
}

int ubispl_load_volumes(struct ubispl_info *info, struct ubispl_load *lvols,
			int nrvols)
{
	struct ubi_scan_info *ubi = info->ubi;
	int res, i, fastmap = info->fastmap;
	u32 fsize;

retry:
	/*
	 * We do a partial initializiation of @ubi. Cleaning fm_buf is
	 * not necessary.
	 */
	memset(ubi, 0, offsetof(struct ubi_scan_info, fm_buf));

	ubi->read = info->read;

	/* Precalculate the offsets */
	ubi->vid_offset = info->vid_offset;
	ubi->leb_start = info->leb_start;
	ubi->leb_size = info->peb_size - ubi->leb_start;
	ubi->peb_count = info->peb_count;
	ubi->peb_offset = info->peb_offset;

	fsize = info->peb_size * info->peb_count;
	ubi->fsize_mb = fsize >> 20;

	/* Fastmap init */
	ubi->fm_size = ubi_calc_fm_size(ubi);
	ubi->fm_enabled = fastmap;

	for (i = 0; i < nrvols; i++) {
		struct ubispl_load *lv = lvols + i;

		generic_set_bit(lv->vol_id, ubi->toload);
	}

	ipl_scan(ubi);

	for (i = 0; i < nrvols; i++) {
		struct ubispl_load *lv = lvols + i;

		ubi_msg("Loading VolId #%d", lv->vol_id);
		res = ipl_load(ubi, lv->vol_id, lv->load_addr);
		if (res < 0) {
			if (fastmap) {
				fastmap = 0;
				goto retry;
			}
			ubi_warn("Failed");
			return res;
		}
	}
	return 0;
}