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61#include <linux/crc32.h>
62#include <linux/err.h>
63#include <linux/slab.h>
64#include <asm/div64.h>
65#include "ubi.h"
66
67static void self_vtbl_check(const struct ubi_device *ubi);
68
69
70static struct ubi_vtbl_record empty_vtbl_record;
71
72
73
74
75
76static int ubi_update_layout_vol(struct ubi_device *ubi)
77{
78 struct ubi_volume *layout_vol;
79 int i, err;
80
81 layout_vol = ubi->volumes[vol_id2idx(ubi, UBI_LAYOUT_VOLUME_ID)];
82 for (i = 0; i < UBI_LAYOUT_VOLUME_EBS; i++) {
83 err = ubi_eba_atomic_leb_change(ubi, layout_vol, i, ubi->vtbl,
84 ubi->vtbl_size);
85 if (err)
86 return err;
87 }
88
89 return 0;
90}
91
92
93
94
95
96
97
98
99
100
101
102
103int ubi_change_vtbl_record(struct ubi_device *ubi, int idx,
104 struct ubi_vtbl_record *vtbl_rec)
105{
106 int err;
107 uint32_t crc;
108
109 ubi_assert(idx >= 0 && idx < ubi->vtbl_slots);
110
111 if (!vtbl_rec)
112 vtbl_rec = &empty_vtbl_record;
113 else {
114 crc = crc32(UBI_CRC32_INIT, vtbl_rec, UBI_VTBL_RECORD_SIZE_CRC);
115 vtbl_rec->crc = cpu_to_be32(crc);
116 }
117
118 memcpy(&ubi->vtbl[idx], vtbl_rec, sizeof(struct ubi_vtbl_record));
119 err = ubi_update_layout_vol(ubi);
120
121 self_vtbl_check(ubi);
122 return err ? err : 0;
123}
124
125
126
127
128
129
130
131
132
133
134int ubi_vtbl_rename_volumes(struct ubi_device *ubi,
135 struct list_head *rename_list)
136{
137 struct ubi_rename_entry *re;
138
139 list_for_each_entry(re, rename_list, list) {
140 uint32_t crc;
141 struct ubi_volume *vol = re->desc->vol;
142 struct ubi_vtbl_record *vtbl_rec = &ubi->vtbl[vol->vol_id];
143
144 if (re->remove) {
145 memcpy(vtbl_rec, &empty_vtbl_record,
146 sizeof(struct ubi_vtbl_record));
147 continue;
148 }
149
150 vtbl_rec->name_len = cpu_to_be16(re->new_name_len);
151 memcpy(vtbl_rec->name, re->new_name, re->new_name_len);
152 memset(vtbl_rec->name + re->new_name_len, 0,
153 UBI_VOL_NAME_MAX + 1 - re->new_name_len);
154 crc = crc32(UBI_CRC32_INIT, vtbl_rec,
155 UBI_VTBL_RECORD_SIZE_CRC);
156 vtbl_rec->crc = cpu_to_be32(crc);
157 }
158
159 return ubi_update_layout_vol(ubi);
160}
161
162
163
164
165
166
167
168
169
170static int vtbl_check(const struct ubi_device *ubi,
171 const struct ubi_vtbl_record *vtbl)
172{
173 int i, n, reserved_pebs, alignment, data_pad, vol_type, name_len;
174 int upd_marker, err;
175 uint32_t crc;
176 const char *name;
177
178 for (i = 0; i < ubi->vtbl_slots; i++) {
179 cond_resched();
180
181 reserved_pebs = be32_to_cpu(vtbl[i].reserved_pebs);
182 alignment = be32_to_cpu(vtbl[i].alignment);
183 data_pad = be32_to_cpu(vtbl[i].data_pad);
184 upd_marker = vtbl[i].upd_marker;
185 vol_type = vtbl[i].vol_type;
186 name_len = be16_to_cpu(vtbl[i].name_len);
187 name = &vtbl[i].name[0];
188
189 crc = crc32(UBI_CRC32_INIT, &vtbl[i], UBI_VTBL_RECORD_SIZE_CRC);
190 if (be32_to_cpu(vtbl[i].crc) != crc) {
191 ubi_err(ubi, "bad CRC at record %u: %#08x, not %#08x",
192 i, crc, be32_to_cpu(vtbl[i].crc));
193 ubi_dump_vtbl_record(&vtbl[i], i);
194 return 1;
195 }
196
197 if (reserved_pebs == 0) {
198 if (memcmp(&vtbl[i], &empty_vtbl_record,
199 UBI_VTBL_RECORD_SIZE)) {
200 err = 2;
201 goto bad;
202 }
203 continue;
204 }
205
206 if (reserved_pebs < 0 || alignment < 0 || data_pad < 0 ||
207 name_len < 0) {
208 err = 3;
209 goto bad;
210 }
211
212 if (alignment > ubi->leb_size || alignment == 0) {
213 err = 4;
214 goto bad;
215 }
216
217 n = alignment & (ubi->min_io_size - 1);
218 if (alignment != 1 && n) {
219 err = 5;
220 goto bad;
221 }
222
223 n = ubi->leb_size % alignment;
224 if (data_pad != n) {
225 ubi_err(ubi, "bad data_pad, has to be %d", n);
226 err = 6;
227 goto bad;
228 }
229
230 if (vol_type != UBI_VID_DYNAMIC && vol_type != UBI_VID_STATIC) {
231 err = 7;
232 goto bad;
233 }
234
235 if (upd_marker != 0 && upd_marker != 1) {
236 err = 8;
237 goto bad;
238 }
239
240 if (reserved_pebs > ubi->good_peb_count) {
241 ubi_err(ubi, "too large reserved_pebs %d, good PEBs %d",
242 reserved_pebs, ubi->good_peb_count);
243 err = 9;
244 goto bad;
245 }
246
247 if (name_len > UBI_VOL_NAME_MAX) {
248 err = 10;
249 goto bad;
250 }
251
252 if (name[0] == '\0') {
253 err = 11;
254 goto bad;
255 }
256
257 if (name_len != strnlen(name, name_len + 1)) {
258 err = 12;
259 goto bad;
260 }
261 }
262
263
264 for (i = 0; i < ubi->vtbl_slots - 1; i++) {
265 for (n = i + 1; n < ubi->vtbl_slots; n++) {
266 int len1 = be16_to_cpu(vtbl[i].name_len);
267 int len2 = be16_to_cpu(vtbl[n].name_len);
268
269 if (len1 > 0 && len1 == len2 &&
270 !strncmp(vtbl[i].name, vtbl[n].name, len1)) {
271 ubi_err(ubi, "volumes %d and %d have the same name \"%s\"",
272 i, n, vtbl[i].name);
273 ubi_dump_vtbl_record(&vtbl[i], i);
274 ubi_dump_vtbl_record(&vtbl[n], n);
275 return -EINVAL;
276 }
277 }
278 }
279
280 return 0;
281
282bad:
283 ubi_err(ubi, "volume table check failed: record %d, error %d", i, err);
284 ubi_dump_vtbl_record(&vtbl[i], i);
285 return -EINVAL;
286}
287
288
289
290
291
292
293
294
295
296
297
298static int create_vtbl(struct ubi_device *ubi, struct ubi_attach_info *ai,
299 int copy, void *vtbl)
300{
301 int err, tries = 0;
302 struct ubi_vid_hdr *vid_hdr;
303 struct ubi_ainf_peb *new_aeb;
304
305 dbg_gen("create volume table (copy #%d)", copy + 1);
306
307 vid_hdr = ubi_zalloc_vid_hdr(ubi, GFP_KERNEL);
308 if (!vid_hdr)
309 return -ENOMEM;
310
311retry:
312 new_aeb = ubi_early_get_peb(ubi, ai);
313 if (IS_ERR(new_aeb)) {
314 err = PTR_ERR(new_aeb);
315 goto out_free;
316 }
317
318 vid_hdr->vol_type = UBI_LAYOUT_VOLUME_TYPE;
319 vid_hdr->vol_id = cpu_to_be32(UBI_LAYOUT_VOLUME_ID);
320 vid_hdr->compat = UBI_LAYOUT_VOLUME_COMPAT;
321 vid_hdr->data_size = vid_hdr->used_ebs =
322 vid_hdr->data_pad = cpu_to_be32(0);
323 vid_hdr->lnum = cpu_to_be32(copy);
324 vid_hdr->sqnum = cpu_to_be64(++ai->max_sqnum);
325
326
327 err = ubi_io_write_vid_hdr(ubi, new_aeb->pnum, vid_hdr);
328 if (err)
329 goto write_error;
330
331
332 err = ubi_io_write_data(ubi, vtbl, new_aeb->pnum, 0, ubi->vtbl_size);
333 if (err)
334 goto write_error;
335
336
337
338
339
340 err = ubi_add_to_av(ubi, ai, new_aeb->pnum, new_aeb->ec, vid_hdr, 0);
341 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
342 ubi_free_vid_hdr(ubi, vid_hdr);
343 return err;
344
345write_error:
346 if (err == -EIO && ++tries <= 5) {
347
348
349
350
351 list_add(&new_aeb->u.list, &ai->erase);
352 goto retry;
353 }
354 kmem_cache_free(ai->aeb_slab_cache, new_aeb);
355out_free:
356 ubi_free_vid_hdr(ubi, vid_hdr);
357 return err;
358
359}
360
361
362
363
364
365
366
367
368
369
370
371static struct ubi_vtbl_record *process_lvol(struct ubi_device *ubi,
372 struct ubi_attach_info *ai,
373 struct ubi_ainf_volume *av)
374{
375 int err;
376 struct rb_node *rb;
377 struct ubi_ainf_peb *aeb;
378 struct ubi_vtbl_record *leb[UBI_LAYOUT_VOLUME_EBS] = { NULL, NULL };
379 int leb_corrupted[UBI_LAYOUT_VOLUME_EBS] = {1, 1};
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 dbg_gen("check layout volume");
407
408
409 ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb) {
410 leb[aeb->lnum] = vzalloc(ubi->vtbl_size);
411 if (!leb[aeb->lnum]) {
412 err = -ENOMEM;
413 goto out_free;
414 }
415
416 err = ubi_io_read_data(ubi, leb[aeb->lnum], aeb->pnum, 0,
417 ubi->vtbl_size);
418 if (err == UBI_IO_BITFLIPS || mtd_is_eccerr(err))
419
420
421
422
423
424
425
426
427
428
429 aeb->scrub = 1;
430 else if (err)
431 goto out_free;
432 }
433
434 err = -EINVAL;
435 if (leb[0]) {
436 leb_corrupted[0] = vtbl_check(ubi, leb[0]);
437 if (leb_corrupted[0] < 0)
438 goto out_free;
439 }
440
441 if (!leb_corrupted[0]) {
442
443 if (leb[1])
444 leb_corrupted[1] = memcmp(leb[0], leb[1],
445 ubi->vtbl_size);
446 if (leb_corrupted[1]) {
447 ubi_warn(ubi, "volume table copy #2 is corrupted");
448 err = create_vtbl(ubi, ai, 1, leb[0]);
449 if (err)
450 goto out_free;
451 ubi_msg(ubi, "volume table was restored");
452 }
453
454
455 vfree(leb[1]);
456 return leb[0];
457 } else {
458
459 if (leb[1]) {
460 leb_corrupted[1] = vtbl_check(ubi, leb[1]);
461 if (leb_corrupted[1] < 0)
462 goto out_free;
463 }
464 if (leb_corrupted[1]) {
465
466 ubi_err(ubi, "both volume tables are corrupted");
467 goto out_free;
468 }
469
470 ubi_warn(ubi, "volume table copy #1 is corrupted");
471 err = create_vtbl(ubi, ai, 0, leb[1]);
472 if (err)
473 goto out_free;
474 ubi_msg(ubi, "volume table was restored");
475
476 vfree(leb[0]);
477 return leb[1];
478 }
479
480out_free:
481 vfree(leb[0]);
482 vfree(leb[1]);
483 return ERR_PTR(err);
484}
485
486
487
488
489
490
491
492
493
494static struct ubi_vtbl_record *create_empty_lvol(struct ubi_device *ubi,
495 struct ubi_attach_info *ai)
496{
497 int i;
498 struct ubi_vtbl_record *vtbl;
499
500 vtbl = vzalloc(ubi->vtbl_size);
501 if (!vtbl)
502 return ERR_PTR(-ENOMEM);
503
504 for (i = 0; i < ubi->vtbl_slots; i++)
505 memcpy(&vtbl[i], &empty_vtbl_record, UBI_VTBL_RECORD_SIZE);
506
507 for (i = 0; i < UBI_LAYOUT_VOLUME_EBS; i++) {
508 int err;
509
510 err = create_vtbl(ubi, ai, i, vtbl);
511 if (err) {
512 vfree(vtbl);
513 return ERR_PTR(err);
514 }
515 }
516
517 return vtbl;
518}
519
520
521
522
523
524
525
526
527
528
529
530static int init_volumes(struct ubi_device *ubi,
531 const struct ubi_attach_info *ai,
532 const struct ubi_vtbl_record *vtbl)
533{
534 int i, reserved_pebs = 0;
535 struct ubi_ainf_volume *av;
536 struct ubi_volume *vol;
537
538 for (i = 0; i < ubi->vtbl_slots; i++) {
539 cond_resched();
540
541 if (be32_to_cpu(vtbl[i].reserved_pebs) == 0)
542 continue;
543
544 vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
545 if (!vol)
546 return -ENOMEM;
547
548 vol->reserved_pebs = be32_to_cpu(vtbl[i].reserved_pebs);
549 vol->alignment = be32_to_cpu(vtbl[i].alignment);
550 vol->data_pad = be32_to_cpu(vtbl[i].data_pad);
551 vol->upd_marker = vtbl[i].upd_marker;
552 vol->vol_type = vtbl[i].vol_type == UBI_VID_DYNAMIC ?
553 UBI_DYNAMIC_VOLUME : UBI_STATIC_VOLUME;
554 vol->name_len = be16_to_cpu(vtbl[i].name_len);
555 vol->usable_leb_size = ubi->leb_size - vol->data_pad;
556 memcpy(vol->name, vtbl[i].name, vol->name_len);
557 vol->name[vol->name_len] = '\0';
558 vol->vol_id = i;
559
560 if (vtbl[i].flags & UBI_VTBL_AUTORESIZE_FLG) {
561
562 if (ubi->autoresize_vol_id != -1) {
563 ubi_err(ubi, "more than one auto-resize volume (%d and %d)",
564 ubi->autoresize_vol_id, i);
565 kfree(vol);
566 return -EINVAL;
567 }
568
569 ubi->autoresize_vol_id = i;
570 }
571
572 ubi_assert(!ubi->volumes[i]);
573 ubi->volumes[i] = vol;
574 ubi->vol_count += 1;
575 vol->ubi = ubi;
576 reserved_pebs += vol->reserved_pebs;
577
578
579
580
581
582 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
583 vol->used_ebs = vol->reserved_pebs;
584 vol->last_eb_bytes = vol->usable_leb_size;
585 vol->used_bytes =
586 (long long)vol->used_ebs * vol->usable_leb_size;
587 continue;
588 }
589
590
591 av = ubi_find_av(ai, i);
592 if (!av || !av->leb_count) {
593
594
595
596
597
598
599
600
601 continue;
602 }
603
604 if (av->leb_count != av->used_ebs) {
605
606
607
608
609 ubi_warn(ubi, "static volume %d misses %d LEBs - corrupted",
610 av->vol_id, av->used_ebs - av->leb_count);
611 vol->corrupted = 1;
612 continue;
613 }
614
615 vol->used_ebs = av->used_ebs;
616 vol->used_bytes =
617 (long long)(vol->used_ebs - 1) * vol->usable_leb_size;
618 vol->used_bytes += av->last_data_size;
619 vol->last_eb_bytes = av->last_data_size;
620 }
621
622
623 vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
624 if (!vol)
625 return -ENOMEM;
626
627 vol->reserved_pebs = UBI_LAYOUT_VOLUME_EBS;
628 vol->alignment = UBI_LAYOUT_VOLUME_ALIGN;
629 vol->vol_type = UBI_DYNAMIC_VOLUME;
630 vol->name_len = sizeof(UBI_LAYOUT_VOLUME_NAME) - 1;
631 memcpy(vol->name, UBI_LAYOUT_VOLUME_NAME, vol->name_len + 1);
632 vol->usable_leb_size = ubi->leb_size;
633 vol->used_ebs = vol->reserved_pebs;
634 vol->last_eb_bytes = vol->reserved_pebs;
635 vol->used_bytes =
636 (long long)vol->used_ebs * (ubi->leb_size - vol->data_pad);
637 vol->vol_id = UBI_LAYOUT_VOLUME_ID;
638 vol->ref_count = 1;
639
640 ubi_assert(!ubi->volumes[i]);
641 ubi->volumes[vol_id2idx(ubi, vol->vol_id)] = vol;
642 reserved_pebs += vol->reserved_pebs;
643 ubi->vol_count += 1;
644 vol->ubi = ubi;
645
646 if (reserved_pebs > ubi->avail_pebs) {
647 ubi_err(ubi, "not enough PEBs, required %d, available %d",
648 reserved_pebs, ubi->avail_pebs);
649 if (ubi->corr_peb_count)
650 ubi_err(ubi, "%d PEBs are corrupted and not used",
651 ubi->corr_peb_count);
652 }
653 ubi->rsvd_pebs += reserved_pebs;
654 ubi->avail_pebs -= reserved_pebs;
655
656 return 0;
657}
658
659
660
661
662
663
664
665
666
667static int check_av(const struct ubi_volume *vol,
668 const struct ubi_ainf_volume *av)
669{
670 int err;
671
672 if (av->highest_lnum >= vol->reserved_pebs) {
673 err = 1;
674 goto bad;
675 }
676 if (av->leb_count > vol->reserved_pebs) {
677 err = 2;
678 goto bad;
679 }
680 if (av->vol_type != vol->vol_type) {
681 err = 3;
682 goto bad;
683 }
684 if (av->used_ebs > vol->reserved_pebs) {
685 err = 4;
686 goto bad;
687 }
688 if (av->data_pad != vol->data_pad) {
689 err = 5;
690 goto bad;
691 }
692 return 0;
693
694bad:
695 ubi_err(vol->ubi, "bad attaching information, error %d", err);
696 ubi_dump_av(av);
697 ubi_dump_vol_info(vol);
698 return -EINVAL;
699}
700
701
702
703
704
705
706
707
708
709
710
711static int check_attaching_info(const struct ubi_device *ubi,
712 struct ubi_attach_info *ai)
713{
714 int err, i;
715 struct ubi_ainf_volume *av;
716 struct ubi_volume *vol;
717
718 if (ai->vols_found > UBI_INT_VOL_COUNT + ubi->vtbl_slots) {
719 ubi_err(ubi, "found %d volumes while attaching, maximum is %d + %d",
720 ai->vols_found, UBI_INT_VOL_COUNT, ubi->vtbl_slots);
721 return -EINVAL;
722 }
723
724 if (ai->highest_vol_id >= ubi->vtbl_slots + UBI_INT_VOL_COUNT &&
725 ai->highest_vol_id < UBI_INTERNAL_VOL_START) {
726 ubi_err(ubi, "too large volume ID %d found",
727 ai->highest_vol_id);
728 return -EINVAL;
729 }
730
731 for (i = 0; i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) {
732 cond_resched();
733
734 av = ubi_find_av(ai, i);
735 vol = ubi->volumes[i];
736 if (!vol) {
737 if (av)
738 ubi_remove_av(ai, av);
739 continue;
740 }
741
742 if (vol->reserved_pebs == 0) {
743 ubi_assert(i < ubi->vtbl_slots);
744
745 if (!av)
746 continue;
747
748
749
750
751
752
753
754
755 ubi_msg(ubi, "finish volume %d removal", av->vol_id);
756 ubi_remove_av(ai, av);
757 } else if (av) {
758 err = check_av(vol, av);
759 if (err)
760 return err;
761 }
762 }
763
764 return 0;
765}
766
767
768
769
770
771
772
773
774
775
776int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_attach_info *ai)
777{
778 int i, err;
779 struct ubi_ainf_volume *av;
780
781 empty_vtbl_record.crc = cpu_to_be32(0xf116c36b);
782
783
784
785
786
787 ubi->vtbl_slots = ubi->leb_size / UBI_VTBL_RECORD_SIZE;
788 if (ubi->vtbl_slots > UBI_MAX_VOLUMES)
789 ubi->vtbl_slots = UBI_MAX_VOLUMES;
790
791 ubi->vtbl_size = ubi->vtbl_slots * UBI_VTBL_RECORD_SIZE;
792 ubi->vtbl_size = ALIGN(ubi->vtbl_size, ubi->min_io_size);
793
794 av = ubi_find_av(ai, UBI_LAYOUT_VOLUME_ID);
795 if (!av) {
796
797
798
799
800
801
802
803
804 if (ai->is_empty) {
805 ubi->vtbl = create_empty_lvol(ubi, ai);
806 if (IS_ERR(ubi->vtbl))
807 return PTR_ERR(ubi->vtbl);
808 } else {
809 ubi_err(ubi, "the layout volume was not found");
810 return -EINVAL;
811 }
812 } else {
813 if (av->leb_count > UBI_LAYOUT_VOLUME_EBS) {
814
815 ubi_err(ubi, "too many LEBs (%d) in layout volume",
816 av->leb_count);
817 return -EINVAL;
818 }
819
820 ubi->vtbl = process_lvol(ubi, ai, av);
821 if (IS_ERR(ubi->vtbl))
822 return PTR_ERR(ubi->vtbl);
823 }
824
825 ubi->avail_pebs = ubi->good_peb_count - ubi->corr_peb_count;
826
827
828
829
830
831 err = init_volumes(ubi, ai, ubi->vtbl);
832 if (err)
833 goto out_free;
834
835
836
837
838
839 err = check_attaching_info(ubi, ai);
840 if (err)
841 goto out_free;
842
843 return 0;
844
845out_free:
846 vfree(ubi->vtbl);
847 for (i = 0; i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) {
848 kfree(ubi->volumes[i]);
849 ubi->volumes[i] = NULL;
850 }
851 return err;
852}
853
854
855
856
857
858static void self_vtbl_check(const struct ubi_device *ubi)
859{
860 if (!ubi_dbg_chk_gen(ubi))
861 return;
862
863 if (vtbl_check(ubi, ubi->vtbl)) {
864 ubi_err(ubi, "self-check failed");
865 BUG();
866 }
867}
868