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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_io_buf *vidb;
303 struct ubi_vid_hdr *vid_hdr;
304 struct ubi_ainf_peb *new_aeb;
305
306 dbg_gen("create volume table (copy #%d)", copy + 1);
307
308 vidb = ubi_alloc_vid_buf(ubi, GFP_KERNEL);
309 if (!vidb)
310 return -ENOMEM;
311
312 vid_hdr = ubi_get_vid_hdr(vidb);
313
314retry:
315 new_aeb = ubi_early_get_peb(ubi, ai);
316 if (IS_ERR(new_aeb)) {
317 err = PTR_ERR(new_aeb);
318 goto out_free;
319 }
320
321 vid_hdr->vol_type = UBI_LAYOUT_VOLUME_TYPE;
322 vid_hdr->vol_id = cpu_to_be32(UBI_LAYOUT_VOLUME_ID);
323 vid_hdr->compat = UBI_LAYOUT_VOLUME_COMPAT;
324 vid_hdr->data_size = vid_hdr->used_ebs =
325 vid_hdr->data_pad = cpu_to_be32(0);
326 vid_hdr->lnum = cpu_to_be32(copy);
327 vid_hdr->sqnum = cpu_to_be64(++ai->max_sqnum);
328
329
330 err = ubi_io_write_vid_hdr(ubi, new_aeb->pnum, vidb);
331 if (err)
332 goto write_error;
333
334
335 err = ubi_io_write_data(ubi, vtbl, new_aeb->pnum, 0, ubi->vtbl_size);
336 if (err)
337 goto write_error;
338
339
340
341
342
343 err = ubi_add_to_av(ubi, ai, new_aeb->pnum, new_aeb->ec, vid_hdr, 0);
344 ubi_free_aeb(ai, new_aeb);
345 ubi_free_vid_buf(vidb);
346 return err;
347
348write_error:
349 if (err == -EIO && ++tries <= 5) {
350
351
352
353
354 list_add(&new_aeb->u.list, &ai->erase);
355 goto retry;
356 }
357 ubi_free_aeb(ai, new_aeb);
358out_free:
359 ubi_free_vid_buf(vidb);
360 return err;
361
362}
363
364
365
366
367
368
369
370
371
372
373
374static struct ubi_vtbl_record *process_lvol(struct ubi_device *ubi,
375 struct ubi_attach_info *ai,
376 struct ubi_ainf_volume *av)
377{
378 int err;
379 struct rb_node *rb;
380 struct ubi_ainf_peb *aeb;
381 struct ubi_vtbl_record *leb[UBI_LAYOUT_VOLUME_EBS] = { NULL, NULL };
382 int leb_corrupted[UBI_LAYOUT_VOLUME_EBS] = {1, 1};
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 dbg_gen("check layout volume");
410
411
412 ubi_rb_for_each_entry(rb, aeb, &av->root, u.rb) {
413 leb[aeb->lnum] = vzalloc(ubi->vtbl_size);
414 if (!leb[aeb->lnum]) {
415 err = -ENOMEM;
416 goto out_free;
417 }
418
419 err = ubi_io_read_data(ubi, leb[aeb->lnum], aeb->pnum, 0,
420 ubi->vtbl_size);
421 if (err == UBI_IO_BITFLIPS || mtd_is_eccerr(err))
422
423
424
425
426
427
428
429
430
431
432 aeb->scrub = 1;
433 else if (err)
434 goto out_free;
435 }
436
437 err = -EINVAL;
438 if (leb[0]) {
439 leb_corrupted[0] = vtbl_check(ubi, leb[0]);
440 if (leb_corrupted[0] < 0)
441 goto out_free;
442 }
443
444 if (!leb_corrupted[0]) {
445
446 if (leb[1])
447 leb_corrupted[1] = memcmp(leb[0], leb[1],
448 ubi->vtbl_size);
449 if (leb_corrupted[1]) {
450 ubi_warn(ubi, "volume table copy #2 is corrupted");
451 err = create_vtbl(ubi, ai, 1, leb[0]);
452 if (err)
453 goto out_free;
454 ubi_msg(ubi, "volume table was restored");
455 }
456
457
458 vfree(leb[1]);
459 return leb[0];
460 } else {
461
462 if (leb[1]) {
463 leb_corrupted[1] = vtbl_check(ubi, leb[1]);
464 if (leb_corrupted[1] < 0)
465 goto out_free;
466 }
467 if (leb_corrupted[1]) {
468
469 ubi_err(ubi, "both volume tables are corrupted");
470 goto out_free;
471 }
472
473 ubi_warn(ubi, "volume table copy #1 is corrupted");
474 err = create_vtbl(ubi, ai, 0, leb[1]);
475 if (err)
476 goto out_free;
477 ubi_msg(ubi, "volume table was restored");
478
479 vfree(leb[0]);
480 return leb[1];
481 }
482
483out_free:
484 vfree(leb[0]);
485 vfree(leb[1]);
486 return ERR_PTR(err);
487}
488
489
490
491
492
493
494
495
496
497static struct ubi_vtbl_record *create_empty_lvol(struct ubi_device *ubi,
498 struct ubi_attach_info *ai)
499{
500 int i;
501 struct ubi_vtbl_record *vtbl;
502
503 vtbl = vzalloc(ubi->vtbl_size);
504 if (!vtbl)
505 return ERR_PTR(-ENOMEM);
506
507 for (i = 0; i < ubi->vtbl_slots; i++)
508 memcpy(&vtbl[i], &empty_vtbl_record, UBI_VTBL_RECORD_SIZE);
509
510 for (i = 0; i < UBI_LAYOUT_VOLUME_EBS; i++) {
511 int err;
512
513 err = create_vtbl(ubi, ai, i, vtbl);
514 if (err) {
515 vfree(vtbl);
516 return ERR_PTR(err);
517 }
518 }
519
520 return vtbl;
521}
522
523
524
525
526
527
528
529
530
531
532
533static int init_volumes(struct ubi_device *ubi,
534 const struct ubi_attach_info *ai,
535 const struct ubi_vtbl_record *vtbl)
536{
537 int i, reserved_pebs = 0;
538 struct ubi_ainf_volume *av;
539 struct ubi_volume *vol;
540
541 for (i = 0; i < ubi->vtbl_slots; i++) {
542 cond_resched();
543
544 if (be32_to_cpu(vtbl[i].reserved_pebs) == 0)
545 continue;
546
547 vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
548 if (!vol)
549 return -ENOMEM;
550
551 vol->reserved_pebs = be32_to_cpu(vtbl[i].reserved_pebs);
552 vol->alignment = be32_to_cpu(vtbl[i].alignment);
553 vol->data_pad = be32_to_cpu(vtbl[i].data_pad);
554 vol->upd_marker = vtbl[i].upd_marker;
555 vol->vol_type = vtbl[i].vol_type == UBI_VID_DYNAMIC ?
556 UBI_DYNAMIC_VOLUME : UBI_STATIC_VOLUME;
557 vol->name_len = be16_to_cpu(vtbl[i].name_len);
558 vol->usable_leb_size = ubi->leb_size - vol->data_pad;
559 memcpy(vol->name, vtbl[i].name, vol->name_len);
560 vol->name[vol->name_len] = '\0';
561 vol->vol_id = i;
562
563 if (vtbl[i].flags & UBI_VTBL_AUTORESIZE_FLG) {
564
565 if (ubi->autoresize_vol_id != -1) {
566 ubi_err(ubi, "more than one auto-resize volume (%d and %d)",
567 ubi->autoresize_vol_id, i);
568 kfree(vol);
569 return -EINVAL;
570 }
571
572 ubi->autoresize_vol_id = i;
573 }
574
575 ubi_assert(!ubi->volumes[i]);
576 ubi->volumes[i] = vol;
577 ubi->vol_count += 1;
578 vol->ubi = ubi;
579 reserved_pebs += vol->reserved_pebs;
580
581
582
583
584
585 if (vol->vol_type == UBI_DYNAMIC_VOLUME) {
586 vol->used_ebs = vol->reserved_pebs;
587 vol->last_eb_bytes = vol->usable_leb_size;
588 vol->used_bytes =
589 (long long)vol->used_ebs * vol->usable_leb_size;
590 continue;
591 }
592
593
594 av = ubi_find_av(ai, i);
595 if (!av || !av->leb_count) {
596
597
598
599
600
601
602
603
604 continue;
605 }
606
607 if (av->leb_count != av->used_ebs) {
608
609
610
611
612 ubi_warn(ubi, "static volume %d misses %d LEBs - corrupted",
613 av->vol_id, av->used_ebs - av->leb_count);
614 vol->corrupted = 1;
615 continue;
616 }
617
618 vol->used_ebs = av->used_ebs;
619 vol->used_bytes =
620 (long long)(vol->used_ebs - 1) * vol->usable_leb_size;
621 vol->used_bytes += av->last_data_size;
622 vol->last_eb_bytes = av->last_data_size;
623 }
624
625
626 vol = kzalloc(sizeof(struct ubi_volume), GFP_KERNEL);
627 if (!vol)
628 return -ENOMEM;
629
630 vol->reserved_pebs = UBI_LAYOUT_VOLUME_EBS;
631 vol->alignment = UBI_LAYOUT_VOLUME_ALIGN;
632 vol->vol_type = UBI_DYNAMIC_VOLUME;
633 vol->name_len = sizeof(UBI_LAYOUT_VOLUME_NAME) - 1;
634 memcpy(vol->name, UBI_LAYOUT_VOLUME_NAME, vol->name_len + 1);
635 vol->usable_leb_size = ubi->leb_size;
636 vol->used_ebs = vol->reserved_pebs;
637 vol->last_eb_bytes = vol->reserved_pebs;
638 vol->used_bytes =
639 (long long)vol->used_ebs * (ubi->leb_size - vol->data_pad);
640 vol->vol_id = UBI_LAYOUT_VOLUME_ID;
641 vol->ref_count = 1;
642
643 ubi_assert(!ubi->volumes[i]);
644 ubi->volumes[vol_id2idx(ubi, vol->vol_id)] = vol;
645 reserved_pebs += vol->reserved_pebs;
646 ubi->vol_count += 1;
647 vol->ubi = ubi;
648
649 if (reserved_pebs > ubi->avail_pebs) {
650 ubi_err(ubi, "not enough PEBs, required %d, available %d",
651 reserved_pebs, ubi->avail_pebs);
652 if (ubi->corr_peb_count)
653 ubi_err(ubi, "%d PEBs are corrupted and not used",
654 ubi->corr_peb_count);
655 return -ENOSPC;
656 }
657 ubi->rsvd_pebs += reserved_pebs;
658 ubi->avail_pebs -= reserved_pebs;
659
660 return 0;
661}
662
663
664
665
666
667
668
669
670
671static int check_av(const struct ubi_volume *vol,
672 const struct ubi_ainf_volume *av)
673{
674 int err;
675
676 if (av->highest_lnum >= vol->reserved_pebs) {
677 err = 1;
678 goto bad;
679 }
680 if (av->leb_count > vol->reserved_pebs) {
681 err = 2;
682 goto bad;
683 }
684 if (av->vol_type != vol->vol_type) {
685 err = 3;
686 goto bad;
687 }
688 if (av->used_ebs > vol->reserved_pebs) {
689 err = 4;
690 goto bad;
691 }
692 if (av->data_pad != vol->data_pad) {
693 err = 5;
694 goto bad;
695 }
696 return 0;
697
698bad:
699 ubi_err(vol->ubi, "bad attaching information, error %d", err);
700 ubi_dump_av(av);
701 ubi_dump_vol_info(vol);
702 return -EINVAL;
703}
704
705
706
707
708
709
710
711
712
713
714
715static int check_attaching_info(const struct ubi_device *ubi,
716 struct ubi_attach_info *ai)
717{
718 int err, i;
719 struct ubi_ainf_volume *av;
720 struct ubi_volume *vol;
721
722 if (ai->vols_found > UBI_INT_VOL_COUNT + ubi->vtbl_slots) {
723 ubi_err(ubi, "found %d volumes while attaching, maximum is %d + %d",
724 ai->vols_found, UBI_INT_VOL_COUNT, ubi->vtbl_slots);
725 return -EINVAL;
726 }
727
728 if (ai->highest_vol_id >= ubi->vtbl_slots + UBI_INT_VOL_COUNT &&
729 ai->highest_vol_id < UBI_INTERNAL_VOL_START) {
730 ubi_err(ubi, "too large volume ID %d found",
731 ai->highest_vol_id);
732 return -EINVAL;
733 }
734
735 for (i = 0; i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) {
736 cond_resched();
737
738 av = ubi_find_av(ai, i);
739 vol = ubi->volumes[i];
740 if (!vol) {
741 if (av)
742 ubi_remove_av(ai, av);
743 continue;
744 }
745
746 if (vol->reserved_pebs == 0) {
747 ubi_assert(i < ubi->vtbl_slots);
748
749 if (!av)
750 continue;
751
752
753
754
755
756
757
758
759 ubi_msg(ubi, "finish volume %d removal", av->vol_id);
760 ubi_remove_av(ai, av);
761 } else if (av) {
762 err = check_av(vol, av);
763 if (err)
764 return err;
765 }
766 }
767
768 return 0;
769}
770
771
772
773
774
775
776
777
778
779
780int ubi_read_volume_table(struct ubi_device *ubi, struct ubi_attach_info *ai)
781{
782 int i, err;
783 struct ubi_ainf_volume *av;
784
785 empty_vtbl_record.crc = cpu_to_be32(0xf116c36b);
786
787
788
789
790
791 ubi->vtbl_slots = ubi->leb_size / UBI_VTBL_RECORD_SIZE;
792 if (ubi->vtbl_slots > UBI_MAX_VOLUMES)
793 ubi->vtbl_slots = UBI_MAX_VOLUMES;
794
795 ubi->vtbl_size = ubi->vtbl_slots * UBI_VTBL_RECORD_SIZE;
796 ubi->vtbl_size = ALIGN(ubi->vtbl_size, ubi->min_io_size);
797
798 av = ubi_find_av(ai, UBI_LAYOUT_VOLUME_ID);
799 if (!av) {
800
801
802
803
804
805
806
807
808 if (ai->is_empty) {
809 ubi->vtbl = create_empty_lvol(ubi, ai);
810 if (IS_ERR(ubi->vtbl))
811 return PTR_ERR(ubi->vtbl);
812 } else {
813 ubi_err(ubi, "the layout volume was not found");
814 return -EINVAL;
815 }
816 } else {
817 if (av->leb_count > UBI_LAYOUT_VOLUME_EBS) {
818
819 ubi_err(ubi, "too many LEBs (%d) in layout volume",
820 av->leb_count);
821 return -EINVAL;
822 }
823
824 ubi->vtbl = process_lvol(ubi, ai, av);
825 if (IS_ERR(ubi->vtbl))
826 return PTR_ERR(ubi->vtbl);
827 }
828
829 ubi->avail_pebs = ubi->good_peb_count - ubi->corr_peb_count;
830
831
832
833
834
835 err = init_volumes(ubi, ai, ubi->vtbl);
836 if (err)
837 goto out_free;
838
839
840
841
842
843 err = check_attaching_info(ubi, ai);
844 if (err)
845 goto out_free;
846
847 return 0;
848
849out_free:
850 vfree(ubi->vtbl);
851 for (i = 0; i < ubi->vtbl_slots + UBI_INT_VOL_COUNT; i++) {
852 kfree(ubi->volumes[i]);
853 ubi->volumes[i] = NULL;
854 }
855 return err;
856}
857
858
859
860
861
862static void self_vtbl_check(const struct ubi_device *ubi)
863{
864 if (!ubi_dbg_chk_gen(ubi))
865 return;
866
867 if (vtbl_check(ubi, ubi->vtbl)) {
868 ubi_err(ubi, "self-check failed");
869 BUG();
870 }
871}
872