-
Notifications
You must be signed in to change notification settings - Fork 102
/
fastmap.c
1699 lines (1407 loc) · 40.4 KB
/
fastmap.c
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
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2012 Linutronix GmbH
* Copyright (c) 2014 sigma star gmbh
* Author: Richard Weinberger <richard@nod.at>
*/
#include <linux/crc32.h>
#include <linux/bitmap.h>
#include "ubi.h"
/**
* init_seen - allocate memory for used for debugging.
* @ubi: UBI device description object
*/
static inline unsigned long *init_seen(struct ubi_device *ubi)
{
unsigned long *ret;
if (!ubi_dbg_chk_fastmap(ubi))
return NULL;
ret = kcalloc(BITS_TO_LONGS(ubi->peb_count), sizeof(unsigned long),
GFP_KERNEL);
if (!ret)
return ERR_PTR(-ENOMEM);
return ret;
}
/**
* free_seen - free the seen logic integer array.
* @seen: integer array of @ubi->peb_count size
*/
static inline void free_seen(unsigned long *seen)
{
kfree(seen);
}
/**
* set_seen - mark a PEB as seen.
* @ubi: UBI device description object
* @pnum: The PEB to be makred as seen
* @seen: integer array of @ubi->peb_count size
*/
static inline void set_seen(struct ubi_device *ubi, int pnum, unsigned long *seen)
{
if (!ubi_dbg_chk_fastmap(ubi) || !seen)
return;
set_bit(pnum, seen);
}
/**
* self_check_seen - check whether all PEB have been seen by fastmap.
* @ubi: UBI device description object
* @seen: integer array of @ubi->peb_count size
*/
static int self_check_seen(struct ubi_device *ubi, unsigned long *seen)
{
int pnum, ret = 0;
if (!ubi_dbg_chk_fastmap(ubi) || !seen)
return 0;
for (pnum = 0; pnum < ubi->peb_count; pnum++) {
if (!test_bit(pnum, seen) && ubi->lookuptbl[pnum]) {
ubi_err(ubi, "self-check failed for PEB %d, fastmap didn't see it", pnum);
ret = -EINVAL;
}
}
return ret;
}
/**
* ubi_calc_fm_size - calculates the fastmap size in bytes for an UBI device.
* @ubi: UBI device description object
*/
size_t ubi_calc_fm_size(struct ubi_device *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);
}
/**
* new_fm_vhdr - allocate a new volume header for fastmap usage.
* @ubi: UBI device description object
* @vol_id: the VID of the new header
*
* Returns a new struct ubi_vid_hdr on success.
* NULL indicates out of memory.
*/
static struct ubi_vid_io_buf *new_fm_vbuf(struct ubi_device *ubi, int vol_id)
{
struct ubi_vid_io_buf *new;
struct ubi_vid_hdr *vh;
new = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
if (!new)
goto out;
vh = ubi_get_vid_hdr(new);
vh->vol_type = UBI_VID_DYNAMIC;
vh->vol_id = cpu_to_be32(vol_id);
/* UBI implementations without fastmap support have to delete the
* fastmap.
*/
vh->compat = UBI_COMPAT_DELETE;
out:
return new;
}
/**
* add_aeb - create and add a attach erase block to a given list.
* @ai: UBI attach info object
* @list: the target list
* @pnum: PEB number of the new attach erase block
* @ec: erease counter of the new LEB
* @scrub: scrub this PEB after attaching
*
* Returns 0 on success, < 0 indicates an internal error.
*/
static int add_aeb(struct ubi_attach_info *ai, struct list_head *list,
int pnum, int ec, int scrub)
{
struct ubi_ainf_peb *aeb;
aeb = ubi_alloc_aeb(ai, pnum, ec);
if (!aeb)
return -ENOMEM;
aeb->lnum = -1;
aeb->scrub = scrub;
aeb->copy_flag = aeb->sqnum = 0;
ai->ec_sum += aeb->ec;
ai->ec_count++;
if (ai->max_ec < aeb->ec)
ai->max_ec = aeb->ec;
if (ai->min_ec > aeb->ec)
ai->min_ec = aeb->ec;
list_add_tail(&aeb->u.list, list);
return 0;
}
/**
* add_vol - create and add a new volume to ubi_attach_info.
* @ai: ubi_attach_info object
* @vol_id: VID of the new volume
* @used_ebs: number of used EBS
* @data_pad: data padding value of the new volume
* @vol_type: volume type
* @last_eb_bytes: number of bytes in the last LEB
*
* Returns the new struct ubi_ainf_volume on success.
* NULL indicates an error.
*/
static struct ubi_ainf_volume *add_vol(struct ubi_attach_info *ai, int vol_id,
int used_ebs, int data_pad, u8 vol_type,
int last_eb_bytes)
{
struct ubi_ainf_volume *av;
av = ubi_add_av(ai, vol_id);
if (IS_ERR(av))
return av;
av->data_pad = data_pad;
av->last_data_size = last_eb_bytes;
av->compat = 0;
av->vol_type = vol_type;
if (av->vol_type == UBI_STATIC_VOLUME)
av->used_ebs = used_ebs;
dbg_bld("found volume (ID %i)", vol_id);
return av;
}
/**
* assign_aeb_to_av - assigns a SEB to a given ainf_volume and removes it
* from it's original list.
* @ai: ubi_attach_info object
* @aeb: the to be assigned SEB
* @av: target scan volume
*/
static void assign_aeb_to_av(struct ubi_attach_info *ai,
struct ubi_ainf_peb *aeb,
struct ubi_ainf_volume *av)
{
struct ubi_ainf_peb *tmp_aeb;
struct rb_node **p = &av->root.rb_node, *parent = NULL;
while (*p) {
parent = *p;
tmp_aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb);
if (aeb->lnum != tmp_aeb->lnum) {
if (aeb->lnum < tmp_aeb->lnum)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
continue;
} else
break;
}
list_del(&aeb->u.list);
av->leb_count++;
rb_link_node(&aeb->u.rb, parent, p);
rb_insert_color(&aeb->u.rb, &av->root);
}
/**
* update_vol - inserts or updates a LEB which was found a pool.
* @ubi: the UBI device object
* @ai: attach info object
* @av: the volume this LEB belongs to
* @new_vh: the volume header derived from new_aeb
* @new_aeb: the AEB to be examined
*
* Returns 0 on success, < 0 indicates an internal error.
*/
static int update_vol(struct ubi_device *ubi, struct ubi_attach_info *ai,
struct ubi_ainf_volume *av, struct ubi_vid_hdr *new_vh,
struct ubi_ainf_peb *new_aeb)
{
struct rb_node **p = &av->root.rb_node, *parent = NULL;
struct ubi_ainf_peb *aeb, *victim;
int cmp_res;
while (*p) {
parent = *p;
aeb = rb_entry(parent, struct ubi_ainf_peb, u.rb);
if (be32_to_cpu(new_vh->lnum) != aeb->lnum) {
if (be32_to_cpu(new_vh->lnum) < aeb->lnum)
p = &(*p)->rb_left;
else
p = &(*p)->rb_right;
continue;
}
/* This case can happen if the fastmap gets written
* because of a volume change (creation, deletion, ..).
* Then a PEB can be within the persistent EBA and the pool.
*/
if (aeb->pnum == new_aeb->pnum) {
ubi_assert(aeb->lnum == new_aeb->lnum);
ubi_free_aeb(ai, new_aeb);
return 0;
}
cmp_res = ubi_compare_lebs(ubi, aeb, new_aeb->pnum, new_vh);
if (cmp_res < 0)
return cmp_res;
/* new_aeb is newer */
if (cmp_res & 1) {
victim = ubi_alloc_aeb(ai, aeb->pnum, aeb->ec);
if (!victim)
return -ENOMEM;
list_add_tail(&victim->u.list, &ai->erase);
if (av->highest_lnum == be32_to_cpu(new_vh->lnum))
av->last_data_size =
be32_to_cpu(new_vh->data_size);
dbg_bld("vol %i: AEB %i's PEB %i is the newer",
av->vol_id, aeb->lnum, new_aeb->pnum);
aeb->ec = new_aeb->ec;
aeb->pnum = new_aeb->pnum;
aeb->copy_flag = new_vh->copy_flag;
aeb->scrub = new_aeb->scrub;
aeb->sqnum = new_aeb->sqnum;
ubi_free_aeb(ai, new_aeb);
/* new_aeb is older */
} else {
dbg_bld("vol %i: AEB %i's PEB %i is old, dropping it",
av->vol_id, aeb->lnum, new_aeb->pnum);
list_add_tail(&new_aeb->u.list, &ai->erase);
}
return 0;
}
/* This LEB is new, let's add it to the volume */
if (av->highest_lnum <= be32_to_cpu(new_vh->lnum)) {
av->highest_lnum = be32_to_cpu(new_vh->lnum);
av->last_data_size = be32_to_cpu(new_vh->data_size);
}
if (av->vol_type == UBI_STATIC_VOLUME)
av->used_ebs = be32_to_cpu(new_vh->used_ebs);
av->leb_count++;
rb_link_node(&new_aeb->u.rb, parent, p);
rb_insert_color(&new_aeb->u.rb, &av->root);
return 0;
}
/**
* process_pool_aeb - we found a non-empty PEB in a pool.
* @ubi: UBI device object
* @ai: attach info object
* @new_vh: the volume header derived from new_aeb
* @new_aeb: the AEB to be examined
*
* Returns 0 on success, < 0 indicates an internal error.
*/
static int process_pool_aeb(struct ubi_device *ubi, struct ubi_attach_info *ai,
struct ubi_vid_hdr *new_vh,
struct ubi_ainf_peb *new_aeb)
{
int vol_id = be32_to_cpu(new_vh->vol_id);
struct ubi_ainf_volume *av;
if (vol_id == UBI_FM_SB_VOLUME_ID || vol_id == UBI_FM_DATA_VOLUME_ID) {
ubi_free_aeb(ai, new_aeb);
return 0;
}
/* Find the volume this SEB belongs to */
av = ubi_find_av(ai, vol_id);
if (!av) {
ubi_err(ubi, "orphaned volume in fastmap pool!");
ubi_free_aeb(ai, new_aeb);
return UBI_BAD_FASTMAP;
}
ubi_assert(vol_id == av->vol_id);
return update_vol(ubi, ai, av, new_vh, new_aeb);
}
/**
* unmap_peb - unmap a PEB.
* If fastmap detects a free PEB in the pool it has to check whether
* this PEB has been unmapped after writing the fastmap.
*
* @ai: UBI attach info object
* @pnum: The PEB to be unmapped
*/
static void unmap_peb(struct ubi_attach_info *ai, int pnum)
{
struct ubi_ainf_volume *av;
struct rb_node *node, *node2;
struct ubi_ainf_peb *aeb;
ubi_rb_for_each_entry(node, av, &ai->volumes, rb) {
ubi_rb_for_each_entry(node2, aeb, &av->root, u.rb) {
if (aeb->pnum == pnum) {
rb_erase(&aeb->u.rb, &av->root);
av->leb_count--;
ubi_free_aeb(ai, aeb);
return;
}
}
}
}
/**
* scan_pool - scans a pool for changed (no longer empty PEBs).
* @ubi: UBI device object
* @ai: attach info object
* @pebs: an array of all PEB numbers in the to be scanned pool
* @pool_size: size of the pool (number of entries in @pebs)
* @max_sqnum: pointer to the maximal sequence number
* @free: list of PEBs which are most likely free (and go into @ai->free)
*
* Returns 0 on success, if the pool is unusable UBI_BAD_FASTMAP is returned.
* < 0 indicates an internal error.
*/
static int scan_pool(struct ubi_device *ubi, struct ubi_attach_info *ai,
__be32 *pebs, int pool_size, unsigned long long *max_sqnum,
struct list_head *free)
{
struct ubi_vid_io_buf *vb;
struct ubi_vid_hdr *vh;
struct ubi_ec_hdr *ech;
struct ubi_ainf_peb *new_aeb;
int i, pnum, err, ret = 0;
ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
if (!ech)
return -ENOMEM;
vb = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
if (!vb) {
kfree(ech);
return -ENOMEM;
}
vh = ubi_get_vid_hdr(vb);
dbg_bld("scanning fastmap pool: size = %i", pool_size);
/*
* Now scan all PEBs in the pool to find changes which have been made
* after the creation of the fastmap
*/
for (i = 0; i < pool_size; i++) {
int scrub = 0;
int image_seq;
pnum = be32_to_cpu(pebs[i]);
if (ubi_io_is_bad(ubi, pnum)) {
ubi_err(ubi, "bad PEB in fastmap pool!");
ret = UBI_BAD_FASTMAP;
goto out;
}
err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
if (err && err != UBI_IO_BITFLIPS) {
ubi_err(ubi, "unable to read EC header! PEB:%i err:%i",
pnum, err);
ret = err > 0 ? UBI_BAD_FASTMAP : err;
goto out;
} else if (err == UBI_IO_BITFLIPS)
scrub = 1;
/*
* Older UBI implementations have image_seq set to zero, so
* we shouldn't fail if image_seq == 0.
*/
image_seq = be32_to_cpu(ech->image_seq);
if (image_seq && (image_seq != ubi->image_seq)) {
ubi_err(ubi, "bad image seq: 0x%x, expected: 0x%x",
be32_to_cpu(ech->image_seq), ubi->image_seq);
ret = UBI_BAD_FASTMAP;
goto out;
}
err = ubi_io_read_vid_hdr(ubi, pnum, vb, 0);
if (err == UBI_IO_FF || err == UBI_IO_FF_BITFLIPS) {
unsigned long long ec = be64_to_cpu(ech->ec);
unmap_peb(ai, pnum);
dbg_bld("Adding PEB to free: %i", pnum);
if (err == UBI_IO_FF_BITFLIPS)
scrub = 1;
ret = add_aeb(ai, free, pnum, ec, scrub);
if (ret)
goto out;
continue;
} else if (err == 0 || err == UBI_IO_BITFLIPS) {
dbg_bld("Found non empty PEB:%i in pool", pnum);
if (err == UBI_IO_BITFLIPS)
scrub = 1;
new_aeb = ubi_alloc_aeb(ai, pnum, be64_to_cpu(ech->ec));
if (!new_aeb) {
ret = -ENOMEM;
goto out;
}
new_aeb->lnum = be32_to_cpu(vh->lnum);
new_aeb->sqnum = be64_to_cpu(vh->sqnum);
new_aeb->copy_flag = vh->copy_flag;
new_aeb->scrub = scrub;
if (*max_sqnum < new_aeb->sqnum)
*max_sqnum = new_aeb->sqnum;
err = process_pool_aeb(ubi, ai, vh, new_aeb);
if (err) {
ret = err > 0 ? UBI_BAD_FASTMAP : err;
goto out;
}
} else {
/* We are paranoid and fall back to scanning mode */
ubi_err(ubi, "fastmap pool PEBs contains damaged PEBs!");
ret = err > 0 ? UBI_BAD_FASTMAP : err;
goto out;
}
}
out:
ubi_free_vid_buf(vb);
kfree(ech);
return ret;
}
/**
* count_fastmap_pebs - Counts the PEBs found by fastmap.
* @ai: The UBI attach info object
*/
static int count_fastmap_pebs(struct ubi_attach_info *ai)
{
struct ubi_ainf_peb *aeb;
struct ubi_ainf_volume *av;
struct rb_node *rb1, *rb2;
int n = 0;
list_for_each_entry(aeb, &ai->erase, u.list)
n++;
list_for_each_entry(aeb, &ai->free, u.list)
n++;
ubi_rb_for_each_entry(rb1, av, &ai->volumes, rb)
ubi_rb_for_each_entry(rb2, aeb, &av->root, u.rb)
n++;
return n;
}
/**
* ubi_attach_fastmap - creates ubi_attach_info from a fastmap.
* @ubi: UBI device object
* @ai: UBI attach info object
* @fm: the fastmap to be attached
*
* Returns 0 on success, UBI_BAD_FASTMAP if the found fastmap was unusable.
* < 0 indicates an internal error.
*/
static int ubi_attach_fastmap(struct ubi_device *ubi,
struct ubi_attach_info *ai,
struct ubi_fastmap_layout *fm)
{
struct list_head used, free;
struct ubi_ainf_volume *av;
struct ubi_ainf_peb *aeb, *tmp_aeb, *_tmp_aeb;
struct ubi_fm_sb *fmsb;
struct ubi_fm_hdr *fmhdr;
struct ubi_fm_scan_pool *fmpl, *fmpl_wl;
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;
unsigned long long max_sqnum = 0;
void *fm_raw = ubi->fm_buf;
INIT_LIST_HEAD(&used);
INIT_LIST_HEAD(&free);
ai->min_ec = UBI_MAX_ERASECOUNTER;
fmsb = (struct ubi_fm_sb *)(fm_raw);
ai->max_sqnum = fmsb->sqnum;
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(ubi, "bad fastmap header magic: 0x%x, expected: 0x%x",
be32_to_cpu(fmhdr->magic), UBI_FM_HDR_MAGIC);
goto fail_bad;
}
fmpl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
fm_pos += sizeof(*fmpl);
if (fm_pos >= fm_size)
goto fail_bad;
if (be32_to_cpu(fmpl->magic) != UBI_FM_POOL_MAGIC) {
ubi_err(ubi, "bad fastmap pool magic: 0x%x, expected: 0x%x",
be32_to_cpu(fmpl->magic), UBI_FM_POOL_MAGIC);
goto fail_bad;
}
fmpl_wl = (struct ubi_fm_scan_pool *)(fm_raw + fm_pos);
fm_pos += sizeof(*fmpl_wl);
if (fm_pos >= fm_size)
goto fail_bad;
if (be32_to_cpu(fmpl_wl->magic) != UBI_FM_POOL_MAGIC) {
ubi_err(ubi, "bad fastmap WL pool magic: 0x%x, expected: 0x%x",
be32_to_cpu(fmpl_wl->magic), UBI_FM_POOL_MAGIC);
goto fail_bad;
}
pool_size = be16_to_cpu(fmpl->size);
wl_pool_size = be16_to_cpu(fmpl_wl->size);
fm->max_pool_size = be16_to_cpu(fmpl->max_size);
fm->max_wl_pool_size = be16_to_cpu(fmpl_wl->max_size);
if (pool_size > UBI_FM_MAX_POOL_SIZE || pool_size < 0) {
ubi_err(ubi, "bad pool size: %i", pool_size);
goto fail_bad;
}
if (wl_pool_size > UBI_FM_MAX_POOL_SIZE || wl_pool_size < 0) {
ubi_err(ubi, "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(ubi, "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(ubi, "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;
ret = add_aeb(ai, &ai->free, be32_to_cpu(fmec->pnum),
be32_to_cpu(fmec->ec), 0);
if (ret)
goto fail;
}
/* 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;
ret = add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
be32_to_cpu(fmec->ec), 0);
if (ret)
goto fail;
}
/* 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;
ret = add_aeb(ai, &used, be32_to_cpu(fmec->pnum),
be32_to_cpu(fmec->ec), 1);
if (ret)
goto fail;
}
/* 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;
ret = add_aeb(ai, &ai->erase, be32_to_cpu(fmec->pnum),
be32_to_cpu(fmec->ec), 1);
if (ret)
goto fail;
}
ai->mean_ec = div_u64(ai->ec_sum, ai->ec_count);
ai->bad_peb_count = be32_to_cpu(fmhdr->bad_peb_count);
/* Iterate over all volumes and read their EBA table */
for (i = 0; i < be32_to_cpu(fmhdr->vol_count); i++) {
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(ubi, "bad fastmap vol header magic: 0x%x, expected: 0x%x",
be32_to_cpu(fmvhdr->magic), UBI_FM_VHDR_MAGIC);
goto fail_bad;
}
av = add_vol(ai, be32_to_cpu(fmvhdr->vol_id),
be32_to_cpu(fmvhdr->used_ebs),
be32_to_cpu(fmvhdr->data_pad),
fmvhdr->vol_type,
be32_to_cpu(fmvhdr->last_eb_bytes));
if (IS_ERR(av)) {
if (PTR_ERR(av) == -EEXIST)
ubi_err(ubi, "volume (ID %i) already exists",
fmvhdr->vol_id);
goto fail_bad;
}
ai->vols_found++;
if (ai->highest_vol_id < be32_to_cpu(fmvhdr->vol_id))
ai->highest_vol_id = be32_to_cpu(fmvhdr->vol_id);
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(ubi, "bad fastmap EBA header magic: 0x%x, expected: 0x%x",
be32_to_cpu(fm_eba->magic), UBI_FM_EBA_MAGIC);
goto fail_bad;
}
for (j = 0; j < be32_to_cpu(fm_eba->reserved_pebs); j++) {
int pnum = be32_to_cpu(fm_eba->pnum[j]);
if (pnum < 0)
continue;
aeb = NULL;
list_for_each_entry(tmp_aeb, &used, u.list) {
if (tmp_aeb->pnum == pnum) {
aeb = tmp_aeb;
break;
}
}
if (!aeb) {
ubi_err(ubi, "PEB %i is in EBA but not in used list", pnum);
goto fail_bad;
}
aeb->lnum = j;
if (av->highest_lnum <= aeb->lnum)
av->highest_lnum = aeb->lnum;
assign_aeb_to_av(ai, aeb, av);
dbg_bld("inserting PEB:%i (LEB %i) to vol %i",
aeb->pnum, aeb->lnum, av->vol_id);
}
}
ret = scan_pool(ubi, ai, fmpl->pebs, pool_size, &max_sqnum, &free);
if (ret)
goto fail;
ret = scan_pool(ubi, ai, fmpl_wl->pebs, wl_pool_size, &max_sqnum, &free);
if (ret)
goto fail;
if (max_sqnum > ai->max_sqnum)
ai->max_sqnum = max_sqnum;
list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list)
list_move_tail(&tmp_aeb->u.list, &ai->free);
list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list)
list_move_tail(&tmp_aeb->u.list, &ai->erase);
ubi_assert(list_empty(&free));
/*
* 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;
return 0;
fail_bad:
ret = UBI_BAD_FASTMAP;
fail:
list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &used, u.list) {
list_del(&tmp_aeb->u.list);
ubi_free_aeb(ai, tmp_aeb);
}
list_for_each_entry_safe(tmp_aeb, _tmp_aeb, &free, u.list) {
list_del(&tmp_aeb->u.list);
ubi_free_aeb(ai, tmp_aeb);
}
return ret;
}
/**
* find_fm_anchor - find the most recent Fastmap superblock (anchor)
* @ai: UBI attach info to be filled
*/
static int find_fm_anchor(struct ubi_attach_info *ai)
{
int ret = -1;
struct ubi_ainf_peb *aeb;
unsigned long long max_sqnum = 0;
list_for_each_entry(aeb, &ai->fastmap, u.list) {
if (aeb->vol_id == UBI_FM_SB_VOLUME_ID && aeb->sqnum > max_sqnum) {
max_sqnum = aeb->sqnum;
ret = aeb->pnum;
}
}
return ret;
}
static struct ubi_ainf_peb *clone_aeb(struct ubi_attach_info *ai,
struct ubi_ainf_peb *old)
{
struct ubi_ainf_peb *new;
new = ubi_alloc_aeb(ai, old->pnum, old->ec);
if (!new)
return NULL;
new->vol_id = old->vol_id;
new->sqnum = old->sqnum;
new->lnum = old->lnum;
new->scrub = old->scrub;
new->copy_flag = old->copy_flag;
return new;
}
/**
* ubi_scan_fastmap - scan the fastmap.
* @ubi: UBI device object
* @ai: UBI attach info to be filled
* @scan_ai: UBI attach info from the first 64 PEBs,
* used to find the most recent Fastmap data structure
*
* Returns 0 on success, UBI_NO_FASTMAP if no fastmap was found,
* UBI_BAD_FASTMAP if one was found but is not usable.
* < 0 indicates an internal error.
*/
int ubi_scan_fastmap(struct ubi_device *ubi, struct ubi_attach_info *ai,
struct ubi_attach_info *scan_ai)
{
struct ubi_fm_sb *fmsb, *fmsb2;
struct ubi_vid_io_buf *vb;
struct ubi_vid_hdr *vh;
struct ubi_ec_hdr *ech;
struct ubi_fastmap_layout *fm;
struct ubi_ainf_peb *aeb;
int i, used_blocks, pnum, fm_anchor, ret = 0;
size_t fm_size;
__be32 crc, tmp_crc;
unsigned long long sqnum = 0;
fm_anchor = find_fm_anchor(scan_ai);
if (fm_anchor < 0)
return UBI_NO_FASTMAP;
/* Copy all (possible) fastmap blocks into our new attach structure. */
list_for_each_entry(aeb, &scan_ai->fastmap, u.list) {
struct ubi_ainf_peb *new;
new = clone_aeb(ai, aeb);
if (!new)
return -ENOMEM;
list_add(&new->u.list, &ai->fastmap);
}
down_write(&ubi->fm_protect);
memset(ubi->fm_buf, 0, ubi->fm_size);
fmsb = kmalloc(sizeof(*fmsb), GFP_KERNEL);
if (!fmsb) {
ret = -ENOMEM;
goto out;
}
fm = kzalloc(sizeof(*fm), GFP_KERNEL);
if (!fm) {
ret = -ENOMEM;
kfree(fmsb);
goto out;
}
ret = ubi_io_read_data(ubi, fmsb, fm_anchor, 0, 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(ubi, "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(ubi, "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(ubi, "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(ubi, "bad fastmap size: %zi, expected: %zi",
fm_size, ubi->fm_size);
ret = UBI_BAD_FASTMAP;
goto free_fm_sb;
}
ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
if (!ech) {
ret = -ENOMEM;
goto free_fm_sb;
}
vb = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
if (!vb) {
ret = -ENOMEM;
goto free_hdr;
}
vh = ubi_get_vid_hdr(vb);
for (i = 0; i < used_blocks; i++) {
int image_seq;
pnum = be32_to_cpu(fmsb->block_loc[i]);
if (ubi_io_is_bad(ubi, pnum)) {
ret = UBI_BAD_FASTMAP;
goto free_hdr;
}
if (i == 0 && pnum != fm_anchor) {
ubi_err(ubi, "Fastmap anchor PEB mismatch: PEB: %i vs. %i",
pnum, fm_anchor);
ret = UBI_BAD_FASTMAP;
goto free_hdr;
}
ret = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
if (ret && ret != UBI_IO_BITFLIPS) {
ubi_err(ubi, "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(ubi, "wrong image seq:%d instead of %d",
be32_to_cpu(ech->image_seq), ubi->image_seq);
ret = UBI_BAD_FASTMAP;
goto free_hdr;
}
ret = ubi_io_read_vid_hdr(ubi, pnum, vb, 0);
if (ret && ret != UBI_IO_BITFLIPS) {
ubi_err(ubi, "unable to read fastmap block# %i (PEB: %i)",
i, pnum);