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49#ifndef __UBOOT__
50#include <linux/crc32.h>
51#include <linux/err.h>
52#include <linux/slab.h>
53#include <asm/div64.h>
54#else
55#include <ubi_uboot.h>
56#endif
57
58#include <linux/err.h>
59#include "ubi.h"
60
61static void self_vtbl_check(const struct ubi_device *ubi);
62
63
64static struct ubi_vtbl_record empty_vtbl_record;
65
66
67
68
69
70static int ubi_update_layout_vol(struct ubi_device *ubi)
71{
72 struct ubi_volume *layout_vol;
73 int i, err;
74
75 layout_vol = ubi->volumes[vol_id2idx(ubi, UBI_LAYOUT_VOLUME_ID)];
76 for (i = 0; i < UBI_LAYOUT_VOLUME_EBS; i++) {
77 err = ubi_eba_atomic_leb_change(ubi, layout_vol, i, ubi->vtbl,
78 ubi->vtbl_size);
79 if (err)
80 return err;
81 }
82
83 return 0;
84}
85
86
87
88
89
90
91
92
93
94
95
96
97int ubi_change_vtbl_record(struct ubi_device *ubi, int idx,
98 struct ubi_vtbl_record *vtbl_rec)
99{
100 int err;
101 uint32_t crc;
102
103 ubi_assert(idx >= 0 && idx < ubi->vtbl_slots);
104
105 if (!vtbl_rec)
106 vtbl_rec = &empty_vtbl_record;
107 else {
108 crc = crc32(UBI_CRC32_INIT, vtbl_rec, UBI_VTBL_RECORD_SIZE_CRC);
109 vtbl_rec->crc = cpu_to_be32(crc);
110 }
111
112 memcpy(&ubi->vtbl[idx], vtbl_rec, sizeof(struct ubi_vtbl_record));
113 err = ubi_update_layout_vol(ubi);
114
115 self_vtbl_check(ubi);
116 return err ? err : 0;
117}
118
119
120
121
122
123
124
125
126
127
128int ubi_vtbl_rename_volumes(struct ubi_device *ubi,
129 struct list_head *rename_list)
130{
131 struct ubi_rename_entry *re;
132
133 list_for_each_entry(re, rename_list, list) {
134 uint32_t crc;
135 struct ubi_volume *vol = re->desc->vol;
136 struct ubi_vtbl_record *vtbl_rec = &ubi->vtbl[vol->vol_id];
137
138 if (re->remove) {
139 memcpy(vtbl_rec, &empty_vtbl_record,
140 sizeof(struct ubi_vtbl_record));
141 continue;
142 }
143
144 vtbl_rec->name_len = cpu_to_be16(re->new_name_len);
145 memcpy(vtbl_rec->name, re->new_name, re->new_name_len);
146 memset(vtbl_rec->name + re->new_name_len, 0,
147 UBI_VOL_NAME_MAX + 1 - re->new_name_len);
148 crc = crc32(UBI_CRC32_INIT, vtbl_rec,
149 UBI_VTBL_RECORD_SIZE_CRC);
150 vtbl_rec->crc = cpu_to_be32(crc);
151 }
152
153 return ubi_update_layout_vol(ubi);
154}
155
156
157
158
159
160
161
162
163
164static int vtbl_check(const struct ubi_device *ubi,
165 const struct ubi_vtbl_record *vtbl)
166{
167 int i, n, reserved_pebs, alignment, data_pad, vol_type, name_len;
168 int upd_marker, err;
169 uint32_t crc;
170 const char *name;
171
172 for (i = 0; i < ubi->vtbl_slots; i++) {
173 cond_resched();
174
175 reserved_pebs = be32_to_cpu(vtbl[i].reserved_pebs);
176 alignment = be32_to_cpu(vtbl[i].alignment);
177 data_pad = be32_to_cpu(vtbl[i].data_pad);
178 upd_marker = vtbl[i].upd_marker;
179 vol_type = vtbl[i].vol_type;
180 name_len = be16_to_cpu(vtbl[i].name_len);
181 name = &vtbl[i].name[0];
182
183 crc = crc32(UBI_CRC32_INIT, &vtbl[i], UBI_VTBL_RECORD_SIZE_CRC);
184 if (be32_to_cpu(vtbl[i].crc) != crc) {
185 ubi_err(ubi, "bad CRC at record %u: %#08x, not %#08x",
186 i, crc, be32_to_cpu(vtbl[i].crc));
187 ubi_dump_vtbl_record(&vtbl[i], i);
188 return 1;
189 }
190
191 if (reserved_pebs == 0) {
192 if (memcmp(&vtbl[i], &empty_vtbl_record,
193 UBI_VTBL_RECORD_SIZE)) {
194 err = 2;
195 goto bad;
196 }
197 continue;
198 }
199
200 if (reserved_pebs < 0 || alignment < 0 || data_pad < 0 ||
201 name_len < 0) {
202 err = 3;
203 goto bad;
204 }
205
206 if (alignment > ubi->leb_size || alignment == 0) {
207 err = 4;
208 goto bad;
209 }
210
211 n = alignment & (ubi->min_io_size - 1);
212 if (alignment != 1 && n) {
213 err = 5;
214 goto bad;
215 }
216
217 n = ubi->leb_size % alignment;
218 if (data_pad != n) {
219 ubi_err(ubi, "bad data_pad, has to be %d", n);
220 err = 6;
221 goto bad;
222 }
223
224 if (vol_type != UBI_VID_DYNAMIC && vol_type != UBI_VID_STATIC) {
225 err = 7;
226 goto bad;
227 }
228
229 if (upd_marker != 0 && upd_marker != 1) {
230 err = 8;
231 goto bad;
232 }
233
234 if (reserved_pebs > ubi->good_peb_count) {
235 ubi_err(ubi, "too large reserved_pebs %d, good PEBs %d",
236 reserved_pebs, ubi->good_peb_count);
237 err = 9;
238 goto bad;
239 }
240
241 if (name_len > UBI_VOL_NAME_MAX) {
242 err = 10;
243 goto bad;
244 }
245
246 if (name[0] == '\0') {
247 err = 11;
248 goto bad;
249 }
250
251 if (name_len != strnlen(name, name_len + 1)) {
252 err = 12;
253 goto bad;
254 }
255 }
256
257
258 for (i = 0; i < ubi->vtbl_slots - 1; i++) {
259 for (n = i + 1; n < ubi->vtbl_slots; n++) {
260 int len1 = be16_to_cpu(vtbl[i].name_len);
261 int len2 = be16_to_cpu(vtbl[n].name_len);
262
263 if (len1 > 0 && len1 == len2 &&
264#ifndef __UBOOT__
265 !strncmp(vtbl[i].name, vtbl[n].name, len1)) {
266#else
267 !strncmp((char *)vtbl[i].name, vtbl[n].name, len1)) {
268#endif
269 ubi_err(ubi, "volumes %d and %d have the same name \"%s\"",
270 i, n, vtbl[i].name);
271 ubi_dump_vtbl_record(&vtbl[i], i);
272 ubi_dump_vtbl_record(&vtbl[n], n);
273 return -EINVAL;
274 }
275 }
276 }
277
278 return 0;
279
280bad:
281 ubi_err(ubi, "volume table check failed: record %d, error %d", i, err);
282 ubi_dump_vtbl_record(&vtbl[i], i);
283 return -EINVAL;
284}
285
286
287
288
289
290
291
292
293
294
295
296static int create_vtbl(struct ubi_device *ubi, struct ubi_attach_info *ai,
297 int copy, void *vtbl)
298{
299 int err, tries = 0;
300 struct ubi_vid_hdr *vid_hdr;
301 struct ubi_ainf_peb *new_aeb;
302
303 dbg_gen("create volume table (copy #%d)", copy + 1);
304
305 vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
306 if (!vid_hdr)
307 return -ENOMEM;
308
309retry:
310 new_aeb = ubi_early_get_peb(ubi, ai);
311 if (IS_ERR(new_aeb)) {
312 err = PTR_ERR(new_aeb);
313 goto out_free;
314 }
315
316 vid_hdr->vol_type = UBI_LAYOUT_VOLUME_TYPE;
317 vid_hdr->vol_id = cpu_to_be32(UBI_LAYOUT_VOLUME_ID);
318 vid_hdr->compat = UBI_LAYOUT_VOLUME_COMPAT;
319 vid_hdr->data_size = vid_hdr->used_ebs =
320 vid_hdr->data_pad = cpu_to_be32(0);
321 vid_hdr->lnum = cpu_to_be32(copy);
322 vid_hdr->sqnum = cpu_to_be64(++ai->max_sqnum);
323
324
325 err = ubi_io_write_vid_hdr(ubi, new_aeb->pnum, vid_hdr);
326 if (err)
327 goto write_error;
328
329
330 err = ubi_io_write_data(ubi, vtbl, new_aeb->pnum, 0, ubi->vtbl_size);
331 if (err)
332 goto write_error;
333
334
335
336
337
338 err = ubi_add_to_av(ubi, ai, new_aeb->pnum, new_aeb->ec, vid_hdr, 0);
339 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
340 ubi_free_vid_hdr(ubi, vid_hdr);
341 return err;
342
343write_error:
344 if (err == -EIO && ++tries <= 5) {
345
346
347
348
349 list_add(&new_aeb->u.list, &ai->erase);
350 goto retry;
351 }
352 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
353out_free:
354 ubi_free_vid_hdr(ubi, vid_hdr);
355 return err;
356
357}
358
359
360
361
362
363
364
365
366
367
368
369static struct ubi_vtbl_record *process_lvol(struct ubi_device *ubi,
370 struct ubi_attach_info *ai,
371 struct ubi_ainf_volume *av)
372{
373 int err;
374 struct rb_node *rb;
375 struct ubi_ainf_peb *aeb;
376 struct ubi_vtbl_record *leb[UBI_LAYOUT_VOLUME_EBS] = { NULL, NULL };
377 int leb_corrupted[UBI_LAYOUT_VOLUME_EBS] = {1, 1};
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 dbg_gen("check layout volume");
405
406
407 ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb) {
408 leb[aeb->lnum] = vzalloc(ubi->vtbl_size);
409 if (!leb[aeb->lnum]) {
410 err = -ENOMEM;
411 goto out_free;
412 }
413
414 err = ubi_io_read_data(ubi, leb[aeb->lnum], aeb->pnum, 0,
415 ubi->vtbl_size);
416 if (err == UBI_IO_BITFLIPS || mtd_is_eccerr(err))
417
418
419
420
421
422
423
424
425
426
427 aeb->scrub = 1;
428 else if (err)
429 goto out_free;
430 }
431
432 err = -EINVAL;
433 if (leb[0]) {
434 leb_corrupted[0] = vtbl_check(ubi, leb[0]);
435 if (leb_corrupted[0] < 0)
436 goto out_free;
437 }
438
439 if (!leb_corrupted[0]) {
440
441 if (leb[1])
442 leb_corrupted[1] = memcmp(leb[0], leb[1],
443 ubi->vtbl_size);
444 if (leb_corrupted[1]) {
445 ubi_warn(ubi, "volume table copy #2 is corrupted");
446 err = create_vtbl(ubi, ai, 1, leb[0]);
447 if (err)
448 goto out_free;
449 ubi_msg(ubi, "volume table was restored");
450 }
451
452
453 vfree(leb[1]);
454 return leb[0];
455 } else {
456
457 if (leb[1]) {
458 leb_corrupted[1] = vtbl_check(ubi, leb[1]);
459 if (leb_corrupted[1] < 0)
460 goto out_free;
461 }
462 if (leb_corrupted[1]) {
463
464 ubi_err(ubi, "both volume tables are corrupted");
465 goto out_free;
466 }
467
468 ubi_warn(ubi, "volume table copy #1 is corrupted");
469 err = create_vtbl(ubi, ai, 0, leb[1]);
470 if (err)
471 goto out_free;
472 ubi_msg(ubi, "volume table was restored");
473
474 vfree(leb[0]);
475 return leb[1];
476 }
477
478out_free:
479 vfree(leb[0]);
480 vfree(leb[1]);
481 return ERR_PTR(err);
482}
483
484
485
486
487
488
489
490
491
492static struct ubi_vtbl_record *create_empty_lvol(struct ubi_device *ubi,
493 struct ubi_attach_info *ai)
494{
495 int i;
496 struct ubi_vtbl_record *vtbl;
497
498 vtbl = vzalloc(ubi->vtbl_size);
499 if (!vtbl)
500 return ERR_PTR(-ENOMEM);
501
502 for (i = 0; i < ubi->vtbl_slots; i++)
503 memcpy(&vtbl[i], &empty_vtbl_record, UBI_VTBL_RECORD_SIZE);
504
505 for (i = 0; i < UBI_LAYOUT_VOLUME_EBS; i++) {
506 int err;
507
508 err = create_vtbl(ubi, ai, i, vtbl);
509 if (err) {
510 vfree(vtbl);
511 return ERR_PTR(err);
512 }
513 }
514
515 return vtbl;
516}
517
518
519
520
521
522
523
524
525
526
527
528static int init_volumes(struct ubi_device *ubi,
529 const struct ubi_attach_info *ai,
530 const struct ubi_vtbl_record *vtbl)
531{
532 int i, reserved_pebs = 0;
533 struct ubi_ainf_volume *av;
534 struct ubi_volume *vol;
535
536 for (i = 0; i < ubi->vtbl_slots; i++) {
537 cond_resched();
538
539 if (be32_to_cpu(vtbl[i].reserved_pebs) == 0)
540 continue;
541
542 vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
543 if (!vol)
544 return -ENOMEM;
545
546 vol->reserved_pebs = be32_to_cpu(vtbl[i].reserved_pebs);
547 vol->alignment = be32_to_cpu(vtbl[i].alignment);
548 vol->data_pad = be32_to_cpu(vtbl[i].data_pad);
549 vol->upd_marker = vtbl[i].upd_marker;
550 vol->vol_type = vtbl[i].vol_type == UBI_VID_DYNAMIC ?
551 UBI_DYNAMIC_VOLUME : UBI_STATIC_VOLUME;
552 vol->name_len = be16_to_cpu(vtbl[i].name_len);
553 vol->usable_leb_size = ubi->leb_size - vol->data_pad;
554 memcpy(vol->name, vtbl[i].name, vol->name_len);
555 vol->name[vol->name_len] = '\0';
556 vol->vol_id = i;
557
558 if (vtbl[i].flags & UBI_VTBL_AUTORESIZE_FLG) {
559
560 if (ubi->autoresize_vol_id != -1) {
561 ubi_err(ubi, "more than one auto-resize volume (%d and %d)",
562 ubi->autoresize_vol_id, i);
563 kfree(vol);
564 return -EINVAL;
565 }
566
567 ubi->autoresize_vol_id = i;
568 }
569
570 ubi_assert(!ubi->volumes[i]);
571 ubi->volumes[i] = vol;
572 ubi->vol_count += 1;
573 vol->ubi = ubi;
574 reserved_pebs += vol->reserved_pebs;
575
576
577
578
579
580 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
581 vol->used_ebs = vol->reserved_pebs;
582 vol->last_eb_bytes = vol->usable_leb_size;
583 vol->used_bytes =
584 (long long)vol->used_ebs * vol->usable_leb_size;
585 continue;
586 }
587
588
589 av = ubi_find_av(ai, i);
590 if (!av || !av->leb_count) {
591
592
593
594
595
596
597
598
599 continue;
600 }
601
602 if (av->leb_count != av->used_ebs) {
603
604
605
606
607 ubi_warn(ubi, "static volume %d misses %d LEBs - corrupted",
608 av->vol_id, av->used_ebs - av->leb_count);
609 vol->corrupted = 1;
610 continue;
611 }
612
613 vol->used_ebs = av->used_ebs;
614 vol->used_bytes =
615 (long long)(vol->used_ebs - 1) * vol->usable_leb_size;
616 vol->used_bytes += av->last_data_size;
617 vol->last_eb_bytes = av->last_data_size;
618 }
619
620
621 vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
622 if (!vol)
623 return -ENOMEM;
624
625 vol->reserved_pebs = UBI_LAYOUT_VOLUME_EBS;
626 vol->alignment = UBI_LAYOUT_VOLUME_ALIGN;
627 vol->vol_type = UBI_DYNAMIC_VOLUME;
628 vol->name_len = sizeof(UBI_LAYOUT_VOLUME_NAME) - 1;
629 memcpy(vol->name, UBI_LAYOUT_VOLUME_NAME, vol->name_len + 1);
630 vol->usable_leb_size = ubi->leb_size;
631 vol->used_ebs = vol->reserved_pebs;
632 vol->last_eb_bytes = vol->reserved_pebs;
633 vol->used_bytes =
634 (long long)vol->used_ebs * (ubi->leb_size - vol->data_pad);
635 vol->vol_id = UBI_LAYOUT_VOLUME_ID;
636 vol->ref_count = 1;
637
638 ubi_assert(!ubi->volumes[i]);
639 ubi->volumes[vol_id2idx(ubi, vol->vol_id)] = vol;
640 reserved_pebs += vol->reserved_pebs;
641 ubi->vol_count += 1;
642 vol->ubi = ubi;
643
644 if (reserved_pebs > ubi->avail_pebs) {
645 ubi_err(ubi, "not enough PEBs, required %d, available %d",
646 reserved_pebs, ubi->avail_pebs);
647 if (ubi->corr_peb_count)
648 ubi_err(ubi, "%d PEBs are corrupted and not used",
649 ubi->corr_peb_count);
650 }
651 ubi->rsvd_pebs += reserved_pebs;
652 ubi->avail_pebs -= reserved_pebs;
653
654 return 0;
655}
656
657
658
659
660
661
662
663
664
665static int check_av(const struct ubi_volume *vol,
666 const struct ubi_ainf_volume *av)
667{
668 int err;
669
670 if (av->highest_lnum >= vol->reserved_pebs) {
671 err = 1;
672 goto bad;
673 }
674 if (av->leb_count > vol->reserved_pebs) {
675 err = 2;
676 goto bad;
677 }
678 if (av->vol_type != vol->vol_type) {
679 err = 3;
680 goto bad;
681 }
682 if (av->used_ebs > vol->reserved_pebs) {
683 err = 4;
684 goto bad;
685 }
686 if (av->data_pad != vol->data_pad) {
687 err = 5;
688 goto bad;
689 }
690 return 0;
691
692bad:
693 ubi_err(vol->ubi, "bad attaching information, error %d", err);
694 ubi_dump_av(av);
695 ubi_dump_vol_info(vol);
696 return -EINVAL;
697}
698
699
700
701
702
703
704
705
706
707
708
709static int check_attaching_info(const struct ubi_device *ubi,
710 struct ubi_attach_info *ai)
711{
712 int err, i;
713 struct ubi_ainf_volume *av;
714 struct ubi_volume *vol;
715
716 if (ai->vols_found > UBI_INT_VOL_COUNT + ubi->vtbl_slots) {
717 ubi_err(ubi, "found %d volumes while attaching, maximum is %d + %d",
718 ai->vols_found, UBI_INT_VOL_COUNT, ubi->vtbl_slots);
719 return -EINVAL;
720 }
721
722 if (ai->highest_vol_id >= ubi->vtbl_slots + UBI_INT_VOL_COUNT &&
723 ai->highest_vol_id < UBI_INTERNAL_VOL_START) {
724 ubi_err(ubi, "too large volume ID %d found",
725 ai->highest_vol_id);
726 return -EINVAL;
727 }
728
729 for (i = 0; i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) {
730 cond_resched();
731
732 av = ubi_find_av(ai, i);
733 vol = ubi->volumes[i];
734 if (!vol) {
735 if (av)
736 ubi_remove_av(ai, av);
737 continue;
738 }
739
740 if (vol->reserved_pebs == 0) {
741 ubi_assert(i < ubi->vtbl_slots);
742
743 if (!av)
744 continue;
745
746
747
748
749
750
751
752
753 ubi_msg(ubi, "finish volume %d removal", av->vol_id);
754 ubi_remove_av(ai, av);
755 } else if (av) {
756 err = check_av(vol, av);
757 if (err)
758 return err;
759 }
760 }
761
762 return 0;
763}
764
765
766
767
768
769
770
771
772
773
774int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_attach_info *ai)
775{
776 int i, err;
777 struct ubi_ainf_volume *av;
778
779 empty_vtbl_record.crc = cpu_to_be32(0xf116c36b);
780
781
782
783
784
785 ubi->vtbl_slots = ubi->leb_size / UBI_VTBL_RECORD_SIZE;
786 if (ubi->vtbl_slots > UBI_MAX_VOLUMES)
787 ubi->vtbl_slots = UBI_MAX_VOLUMES;
788
789 ubi->vtbl_size = ubi->vtbl_slots * UBI_VTBL_RECORD_SIZE;
790 ubi->vtbl_size = ALIGN(ubi->vtbl_size, ubi->min_io_size);
791
792 av = ubi_find_av(ai, UBI_LAYOUT_VOLUME_ID);
793 if (!av) {
794
795
796
797
798
799
800
801
802 if (ai->is_empty) {
803 ubi->vtbl = create_empty_lvol(ubi, ai);
804 if (IS_ERR(ubi->vtbl))
805 return PTR_ERR(ubi->vtbl);
806 } else {
807 ubi_err(ubi, "the layout volume was not found");
808 return -EINVAL;
809 }
810 } else {
811 if (av->leb_count > UBI_LAYOUT_VOLUME_EBS) {
812
813 ubi_err(ubi, "too many LEBs (%d) in layout volume",
814 av->leb_count);
815 return -EINVAL;
816 }
817
818 ubi->vtbl = process_lvol(ubi, ai, av);
819 if (IS_ERR(ubi->vtbl))
820 return PTR_ERR(ubi->vtbl);
821 }
822
823 ubi->avail_pebs = ubi->good_peb_count - ubi->corr_peb_count;
824
825
826
827
828
829 err = init_volumes(ubi, ai, ubi->vtbl);
830 if (err)
831 goto out_free;
832
833
834
835
836
837 err = check_attaching_info(ubi, ai);
838 if (err)
839 goto out_free;
840
841 return 0;
842
843out_free:
844 vfree(ubi->vtbl);
845 for (i = 0; i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) {
846 kfree(ubi->volumes[i]);
847 ubi->volumes[i] = NULL;
848 }
849 return err;
850}
851
852
853
854
855
856static void self_vtbl_check(const struct ubi_device *ubi)
857{
858 if (!ubi_dbg_chk_gen(ubi))
859 return;
860
861 if (vtbl_check(ubi, ubi->vtbl)) {
862 ubi_err(ubi, "self-check failed");
863 BUG();
864 }
865}
866