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btrfs-progs: check: lowmem, fix false alert about backref lost for SHARED_DATA_REF
[btrfs-progs-unstable/devel.git] / chunk-recover.c
blob0dc8a430c0c32dc3df604f4f6c5c2b42abfd3fae
1 /*
2 * Copyright (C) 2013 FUJITSU LIMITED. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
19 #include "kerncompat.h"
20 #include "androidcompat.h"
21
22 #include <stdio.h>
23 #include <stdio_ext.h>
24 #include <stdlib.h>
25 #include <sys/types.h>
26 #include <sys/stat.h>
27 #include <fcntl.h>
28 #include <unistd.h>
29 #include <uuid/uuid.h>
30 #include <pthread.h>
31
32 #include "list.h"
33 #include "radix-tree.h"
34 #include "ctree.h"
35 #include "extent-cache.h"
36 #include "disk-io.h"
37 #include "volumes.h"
38 #include "transaction.h"
39 #include "crc32c.h"
40 #include "utils.h"
41 #include "btrfsck.h"
42 #include "commands.h"
43
44 struct recover_control {
45 int verbose;
46 int yes;
47
48 u16 csum_size;
49 u32 sectorsize;
50 u32 nodesize;
51 u64 generation;
52 u64 chunk_root_generation;
53
54 struct btrfs_fs_devices *fs_devices;
55
56 struct cache_tree chunk;
57 struct block_group_tree bg;
58 struct device_extent_tree devext;
59 struct cache_tree eb_cache;
60
61 struct list_head good_chunks;
62 struct list_head bad_chunks;
63 struct list_head rebuild_chunks;
64 struct list_head unrepaired_chunks;
65 pthread_mutex_t rc_lock;
66 };
67
68 struct extent_record {
69 struct cache_extent cache;
70 u64 generation;
71 u8 csum[BTRFS_CSUM_SIZE];
72 struct btrfs_device *devices[BTRFS_MAX_MIRRORS];
73 u64 offsets[BTRFS_MAX_MIRRORS];
74 int nmirrors;
75 };
76
77 struct device_scan {
78 struct recover_control *rc;
79 struct btrfs_device *dev;
80 int fd;
81 u64 bytenr;
82 };
83
84 static struct extent_record *btrfs_new_extent_record(struct extent_buffer *eb)
85 {
86 struct extent_record *rec;
87
88 rec = calloc(1, sizeof(*rec));
89 if (!rec) {
90 fprintf(stderr, "Fail to allocate memory for extent record.\n");
91 exit(1);
92 }
93
94 rec->cache.start = btrfs_header_bytenr(eb);
95 rec->cache.size = eb->len;
96 rec->generation = btrfs_header_generation(eb);
97 read_extent_buffer(eb, rec->csum, (unsigned long)btrfs_header_csum(eb),
98 BTRFS_CSUM_SIZE);
99 return rec;
100 }
101
102 static int process_extent_buffer(struct cache_tree *eb_cache,
103 struct extent_buffer *eb,
104 struct btrfs_device *device, u64 offset)
105 {
106 struct extent_record *rec;
107 struct extent_record *exist;
108 struct cache_extent *cache;
109 int ret = 0;
110
111 rec = btrfs_new_extent_record(eb);
112 if (!rec->cache.size)
113 goto free_out;
114 again:
115 cache = lookup_cache_extent(eb_cache,
116 rec->cache.start,
117 rec->cache.size);
118 if (cache) {
119 exist = container_of(cache, struct extent_record, cache);
120
121 if (exist->generation > rec->generation)
122 goto free_out;
123 if (exist->generation == rec->generation) {
124 if (exist->cache.start != rec->cache.start ||
125 exist->cache.size != rec->cache.size ||
126 memcmp(exist->csum, rec->csum, BTRFS_CSUM_SIZE)) {
127 ret = -EEXIST;
128 } else {
129 BUG_ON(exist->nmirrors >= BTRFS_MAX_MIRRORS);
130 exist->devices[exist->nmirrors] = device;
131 exist->offsets[exist->nmirrors] = offset;
132 exist->nmirrors++;
133 }
134 goto free_out;
135 }
136 remove_cache_extent(eb_cache, cache);
137 free(exist);
138 goto again;
139 }
140
141 rec->devices[0] = device;
142 rec->offsets[0] = offset;
143 rec->nmirrors++;
144 ret = insert_cache_extent(eb_cache, &rec->cache);
145 BUG_ON(ret);
146 out:
147 return ret;
148 free_out:
149 free(rec);
150 goto out;
151 }
152
153 static void free_extent_record(struct cache_extent *cache)
154 {
155 struct extent_record *er;
156
157 er = container_of(cache, struct extent_record, cache);
158 free(er);
159 }
160
161 FREE_EXTENT_CACHE_BASED_TREE(extent_record, free_extent_record);
162
163 static struct btrfs_chunk *create_chunk_item(struct chunk_record *record)
164 {
165 struct btrfs_chunk *ret;
166 struct btrfs_stripe *chunk_stripe;
167 int i;
168
169 if (!record || record->num_stripes == 0)
170 return NULL;
171 ret = malloc(btrfs_chunk_item_size(record->num_stripes));
172 if (!ret)
173 return NULL;
174 btrfs_set_stack_chunk_length(ret, record->length);
175 btrfs_set_stack_chunk_owner(ret, record->owner);
176 btrfs_set_stack_chunk_stripe_len(ret, record->stripe_len);
177 btrfs_set_stack_chunk_type(ret, record->type_flags);
178 btrfs_set_stack_chunk_io_align(ret, record->io_align);
179 btrfs_set_stack_chunk_io_width(ret, record->io_width);
180 btrfs_set_stack_chunk_sector_size(ret, record->sector_size);
181 btrfs_set_stack_chunk_num_stripes(ret, record->num_stripes);
182 btrfs_set_stack_chunk_sub_stripes(ret, record->sub_stripes);
183 for (i = 0, chunk_stripe = &ret->stripe; i < record->num_stripes;
184 i++, chunk_stripe++) {
185 btrfs_set_stack_stripe_devid(chunk_stripe,
186 record->stripes[i].devid);
187 btrfs_set_stack_stripe_offset(chunk_stripe,
188 record->stripes[i].offset);
189 memcpy(chunk_stripe->dev_uuid, record->stripes[i].dev_uuid,
190 BTRFS_UUID_SIZE);
191 }
192 return ret;
193 }
194
195 static void init_recover_control(struct recover_control *rc, int verbose,
196 int yes)
197 {
198 memset(rc, 0, sizeof(struct recover_control));
199 cache_tree_init(&rc->chunk);
200 cache_tree_init(&rc->eb_cache);
201 block_group_tree_init(&rc->bg);
202 device_extent_tree_init(&rc->devext);
203
204 INIT_LIST_HEAD(&rc->good_chunks);
205 INIT_LIST_HEAD(&rc->bad_chunks);
206 INIT_LIST_HEAD(&rc->rebuild_chunks);
207 INIT_LIST_HEAD(&rc->unrepaired_chunks);
208
209 rc->verbose = verbose;
210 rc->yes = yes;
211 pthread_mutex_init(&rc->rc_lock, NULL);
212 }
213
214 static void free_recover_control(struct recover_control *rc)
215 {
216 free_block_group_tree(&rc->bg);
217 free_chunk_cache_tree(&rc->chunk);
218 free_device_extent_tree(&rc->devext);
219 free_extent_record_tree(&rc->eb_cache);
220 pthread_mutex_destroy(&rc->rc_lock);
221 }
222
223 static int process_block_group_item(struct block_group_tree *bg_cache,
224 struct extent_buffer *leaf,
225 struct btrfs_key *key, int slot)
226 {
227 struct block_group_record *rec;
228 struct block_group_record *exist;
229 struct cache_extent *cache;
230 int ret = 0;
231
232 rec = btrfs_new_block_group_record(leaf, key, slot);
233 if (!rec->cache.size)
234 goto free_out;
235 again:
236 cache = lookup_cache_extent(&bg_cache->tree,
237 rec->cache.start,
238 rec->cache.size);
239 if (cache) {
240 exist = container_of(cache, struct block_group_record, cache);
241
242 /*check the generation and replace if needed*/
243 if (exist->generation > rec->generation)
244 goto free_out;
245 if (exist->generation == rec->generation) {
246 int offset = offsetof(struct block_group_record,
247 generation);
248 /*
249 * According to the current kernel code, the following
250 * case is impossible, or there is something wrong in
251 * the kernel code.
252 */
253 if (memcmp(((void *)exist) + offset,
254 ((void *)rec) + offset,
255 sizeof(*rec) - offset))
256 ret = -EEXIST;
257 goto free_out;
258 }
259 remove_cache_extent(&bg_cache->tree, cache);
260 list_del_init(&exist->list);
261 free(exist);
262 /*
263 * We must do search again to avoid the following cache.
264 * /--old bg 1--//--old bg 2--/
265 * /--new bg--/
266 */
267 goto again;
268 }
269
270 ret = insert_block_group_record(bg_cache, rec);
271 BUG_ON(ret);
272 out:
273 return ret;
274 free_out:
275 free(rec);
276 goto out;
277 }
278
279 static int process_chunk_item(struct cache_tree *chunk_cache,
280 struct extent_buffer *leaf, struct btrfs_key *key,
281 int slot)
282 {
283 struct chunk_record *rec;
284 struct chunk_record *exist;
285 struct cache_extent *cache;
286 int ret = 0;
287
288 rec = btrfs_new_chunk_record(leaf, key, slot);
289 if (!rec->cache.size)
290 goto free_out;
291 again:
292 cache = lookup_cache_extent(chunk_cache, rec->offset, rec->length);
293 if (cache) {
294 exist = container_of(cache, struct chunk_record, cache);
295
296 if (exist->generation > rec->generation)
297 goto free_out;
298 if (exist->generation == rec->generation) {
299 int num_stripes = rec->num_stripes;
300 int rec_size = btrfs_chunk_record_size(num_stripes);
301 int offset = offsetof(struct chunk_record, generation);
302
303 if (exist->num_stripes != rec->num_stripes ||
304 memcmp(((void *)exist) + offset,
305 ((void *)rec) + offset,
306 rec_size - offset))
307 ret = -EEXIST;
308 goto free_out;
309 }
310 remove_cache_extent(chunk_cache, cache);
311 free(exist);
312 goto again;
313 }
314 ret = insert_cache_extent(chunk_cache, &rec->cache);
315 BUG_ON(ret);
316 out:
317 return ret;
318 free_out:
319 free(rec);
320 goto out;
321 }
322
323 static int process_device_extent_item(struct device_extent_tree *devext_cache,
324 struct extent_buffer *leaf,
325 struct btrfs_key *key, int slot)
326 {
327 struct device_extent_record *rec;
328 struct device_extent_record *exist;
329 struct cache_extent *cache;
330 int ret = 0;
331
332 rec = btrfs_new_device_extent_record(leaf, key, slot);
333 if (!rec->cache.size)
334 goto free_out;
335 again:
336 cache = lookup_cache_extent2(&devext_cache->tree,
337 rec->cache.objectid,
338 rec->cache.start,
339 rec->cache.size);
340 if (cache) {
341 exist = container_of(cache, struct device_extent_record, cache);
342 if (exist->generation > rec->generation)
343 goto free_out;
344 if (exist->generation == rec->generation) {
345 int offset = offsetof(struct device_extent_record,
346 generation);
347 if (memcmp(((void *)exist) + offset,
348 ((void *)rec) + offset,
349 sizeof(*rec) - offset))
350 ret = -EEXIST;
351 goto free_out;
352 }
353 remove_cache_extent(&devext_cache->tree, cache);
354 list_del_init(&exist->chunk_list);
355 list_del_init(&exist->device_list);
356 free(exist);
357 goto again;
358 }
359
360 ret = insert_device_extent_record(devext_cache, rec);
361 BUG_ON(ret);
362 out:
363 return ret;
364 free_out:
365 free(rec);
366 goto out;
367 }
368
369 static void print_block_group_info(struct block_group_record *rec, char *prefix)
370 {
371 if (prefix)
372 printf("%s", prefix);
373 printf("Block Group: start = %llu, len = %llu, flag = %llx\n",
374 rec->objectid, rec->offset, rec->flags);
375 }
376
377 static void print_block_group_tree(struct block_group_tree *tree)
378 {
379 struct cache_extent *cache;
380 struct block_group_record *rec;
381
382 printf("All Block Groups:\n");
383 for (cache = first_cache_extent(&tree->tree); cache;
384 cache = next_cache_extent(cache)) {
385 rec = container_of(cache, struct block_group_record, cache);
386 print_block_group_info(rec, "\t");
387 }
388 printf("\n");
389 }
390
391 static void print_stripe_info(struct stripe *data, char *prefix1, char *prefix2,
392 int index)
393 {
394 if (prefix1)
395 printf("%s", prefix1);
396 if (prefix2)
397 printf("%s", prefix2);
398 printf("[%2d] Stripe: devid = %llu, offset = %llu\n",
399 index, data->devid, data->offset);
400 }
401
402 static void print_chunk_self_info(struct chunk_record *rec, char *prefix)
403 {
404 int i;
405
406 if (prefix)
407 printf("%s", prefix);
408 printf("Chunk: start = %llu, len = %llu, type = %llx, num_stripes = %u\n",
409 rec->offset, rec->length, rec->type_flags, rec->num_stripes);
410 if (prefix)
411 printf("%s", prefix);
412 printf(" Stripes list:\n");
413 for (i = 0; i < rec->num_stripes; i++)
414 print_stripe_info(&rec->stripes[i], prefix, " ", i);
415 }
416
417 static void print_chunk_tree(struct cache_tree *tree)
418 {
419 struct cache_extent *n;
420 struct chunk_record *entry;
421
422 printf("All Chunks:\n");
423 for (n = first_cache_extent(tree); n;
424 n = next_cache_extent(n)) {
425 entry = container_of(n, struct chunk_record, cache);
426 print_chunk_self_info(entry, "\t");
427 }
428 printf("\n");
429 }
430
431 static void print_device_extent_info(struct device_extent_record *rec,
432 char *prefix)
433 {
434 if (prefix)
435 printf("%s", prefix);
436 printf("Device extent: devid = %llu, start = %llu, len = %llu, chunk offset = %llu\n",
437 rec->objectid, rec->offset, rec->length, rec->chunk_offset);
438 }
439
440 static void print_device_extent_tree(struct device_extent_tree *tree)
441 {
442 struct cache_extent *n;
443 struct device_extent_record *entry;
444
445 printf("All Device Extents:\n");
446 for (n = first_cache_extent(&tree->tree); n;
447 n = next_cache_extent(n)) {
448 entry = container_of(n, struct device_extent_record, cache);
449 print_device_extent_info(entry, "\t");
450 }
451 printf("\n");
452 }
453
454 static void print_device_info(struct btrfs_device *device, char *prefix)
455 {
456 if (prefix)
457 printf("%s", prefix);
458 printf("Device: id = %llu, name = %s\n",
459 device->devid, device->name);
460 }
461
462 static void print_all_devices(struct list_head *devices)
463 {
464 struct btrfs_device *dev;
465
466 printf("All Devices:\n");
467 list_for_each_entry(dev, devices, dev_list)
468 print_device_info(dev, "\t");
469 printf("\n");
470 }
471
472 static void print_scan_result(struct recover_control *rc)
473 {
474 if (!rc->verbose)
475 return;
476
477 printf("DEVICE SCAN RESULT:\n");
478 printf("Filesystem Information:\n");
479 printf("\tsectorsize: %d\n", rc->sectorsize);
480 printf("\tnodesize: %d\n", rc->nodesize);
481 printf("\ttree root generation: %llu\n", rc->generation);
482 printf("\tchunk root generation: %llu\n", rc->chunk_root_generation);
483 printf("\n");
484
485 print_all_devices(&rc->fs_devices->devices);
486 print_block_group_tree(&rc->bg);
487 print_chunk_tree(&rc->chunk);
488 print_device_extent_tree(&rc->devext);
489 }
490
491 static void print_chunk_info(struct chunk_record *chunk, char *prefix)
492 {
493 struct device_extent_record *devext;
494 int i;
495
496 print_chunk_self_info(chunk, prefix);
497 if (prefix)
498 printf("%s", prefix);
499 if (chunk->bg_rec)
500 print_block_group_info(chunk->bg_rec, " ");
501 else
502 printf(" No block group.\n");
503 if (prefix)
504 printf("%s", prefix);
505 if (list_empty(&chunk->dextents)) {
506 printf(" No device extent.\n");
507 } else {
508 printf(" Device extent list:\n");
509 i = 0;
510 list_for_each_entry(devext, &chunk->dextents, chunk_list) {
511 if (prefix)
512 printf("%s", prefix);
513 printf("%s[%2d]", " ", i);
514 print_device_extent_info(devext, NULL);
515 i++;
516 }
517 }
518 }
519
520 static void print_check_result(struct recover_control *rc)
521 {
522 struct chunk_record *chunk;
523 struct block_group_record *bg;
524 struct device_extent_record *devext;
525 int total = 0;
526 int good = 0;
527 int bad = 0;
528
529 if (!rc->verbose)
530 return;
531
532 printf("CHECK RESULT:\n");
533 printf("Recoverable Chunks:\n");
534 list_for_each_entry(chunk, &rc->good_chunks, list) {
535 print_chunk_info(chunk, " ");
536 good++;
537 total++;
538 }
539 list_for_each_entry(chunk, &rc->rebuild_chunks, list) {
540 print_chunk_info(chunk, " ");
541 good++;
542 total++;
543 }
544 list_for_each_entry(chunk, &rc->unrepaired_chunks, list) {
545 print_chunk_info(chunk, " ");
546 good++;
547 total++;
548 }
549 printf("Unrecoverable Chunks:\n");
550 list_for_each_entry(chunk, &rc->bad_chunks, list) {
551 print_chunk_info(chunk, " ");
552 bad++;
553 total++;
554 }
555 printf("\n");
556 printf("Total Chunks:\t\t%d\n", total);
557 printf(" Recoverable:\t\t%d\n", good);
558 printf(" Unrecoverable:\t%d\n", bad);
559
560 printf("\n");
561 printf("Orphan Block Groups:\n");
562 list_for_each_entry(bg, &rc->bg.block_groups, list)
563 print_block_group_info(bg, " ");
564
565 printf("\n");
566 printf("Orphan Device Extents:\n");
567 list_for_each_entry(devext, &rc->devext.no_chunk_orphans, chunk_list)
568 print_device_extent_info(devext, " ");
569 printf("\n");
570 }
571
572 static int check_chunk_by_metadata(struct recover_control *rc,
573 struct btrfs_root *root,
574 struct chunk_record *chunk, int bg_only)
575 {
576 int ret;
577 int i;
578 int slot;
579 struct btrfs_path path;
580 struct btrfs_key key;
581 struct btrfs_root *dev_root;
582 struct stripe *stripe;
583 struct btrfs_dev_extent *dev_extent;
584 struct btrfs_block_group_item *bg_ptr;
585 struct extent_buffer *l;
586
587 btrfs_init_path(&path);
588
589 if (bg_only)
590 goto bg_check;
591
592 dev_root = root->fs_info->dev_root;
593 for (i = 0; i < chunk->num_stripes; i++) {
594 stripe = &chunk->stripes[i];
595
596 key.objectid = stripe->devid;
597 key.offset = stripe->offset;
598 key.type = BTRFS_DEV_EXTENT_KEY;
599
600 ret = btrfs_search_slot(NULL, dev_root, &key, &path, 0, 0);
601 if (ret < 0) {
602 fprintf(stderr, "Search device extent failed(%d)\n",
603 ret);
604 btrfs_release_path(&path);
605 return ret;
606 } else if (ret > 0) {
607 if (rc->verbose)
608 fprintf(stderr,
609 "No device extent[%llu, %llu]\n",
610 stripe->devid, stripe->offset);
611 btrfs_release_path(&path);
612 return -ENOENT;
613 }
614 l = path.nodes[0];
615 slot = path.slots[0];
616 dev_extent = btrfs_item_ptr(l, slot, struct btrfs_dev_extent);
617 if (chunk->offset !=
618 btrfs_dev_extent_chunk_offset(l, dev_extent)) {
619 if (rc->verbose)
620 fprintf(stderr,
621 "Device tree mismatch with chunks dev_extent[%llu, %llu], chunk[%llu, %llu]\n",
622 btrfs_dev_extent_chunk_offset(l,
623 dev_extent),
624 btrfs_dev_extent_length(l, dev_extent),
625 chunk->offset, chunk->length);
626 btrfs_release_path(&path);
627 return -ENOENT;
628 }
629 btrfs_release_path(&path);
630 }
631
632 bg_check:
633 key.objectid = chunk->offset;
634 key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
635 key.offset = chunk->length;
636
637 ret = btrfs_search_slot(NULL, root->fs_info->extent_root, &key, &path,
638 0, 0);
639 if (ret < 0) {
640 fprintf(stderr, "Search block group failed(%d)\n", ret);
641 btrfs_release_path(&path);
642 return ret;
643 } else if (ret > 0) {
644 if (rc->verbose)
645 fprintf(stderr, "No block group[%llu, %llu]\n",
646 key.objectid, key.offset);
647 btrfs_release_path(&path);
648 return -ENOENT;
649 }
650
651 l = path.nodes[0];
652 slot = path.slots[0];
653 bg_ptr = btrfs_item_ptr(l, slot, struct btrfs_block_group_item);
654 if (chunk->type_flags != btrfs_disk_block_group_flags(l, bg_ptr)) {
655 if (rc->verbose)
656 fprintf(stderr,
657 "Chunk[%llu, %llu]'s type(%llu) is different with Block Group's type(%llu)\n",
658 chunk->offset, chunk->length, chunk->type_flags,
659 btrfs_disk_block_group_flags(l, bg_ptr));
660 btrfs_release_path(&path);
661 return -ENOENT;
662 }
663 btrfs_release_path(&path);
664 return 0;
665 }
666
667 static int check_all_chunks_by_metadata(struct recover_control *rc,
668 struct btrfs_root *root)
669 {
670 struct chunk_record *chunk;
671 struct chunk_record *next;
672 LIST_HEAD(orphan_chunks);
673 int ret = 0;
674 int err;
675
676 list_for_each_entry_safe(chunk, next, &rc->good_chunks, list) {
677 err = check_chunk_by_metadata(rc, root, chunk, 0);
678 if (err) {
679 if (err == -ENOENT)
680 list_move_tail(&chunk->list, &orphan_chunks);
681 else if (err && !ret)
682 ret = err;
683 }
684 }
685
686 list_for_each_entry_safe(chunk, next, &rc->unrepaired_chunks, list) {
687 err = check_chunk_by_metadata(rc, root, chunk, 1);
688 if (err == -ENOENT)
689 list_move_tail(&chunk->list, &orphan_chunks);
690 else if (err && !ret)
691 ret = err;
692 }
693
694 list_for_each_entry(chunk, &rc->bad_chunks, list) {
695 err = check_chunk_by_metadata(rc, root, chunk, 1);
696 if (err != -ENOENT && !ret)
697 ret = err ? err : -EINVAL;
698 }
699 list_splice(&orphan_chunks, &rc->bad_chunks);
700 return ret;
701 }
702
703 static int extract_metadata_record(struct recover_control *rc,
704 struct extent_buffer *leaf)
705 {
706 struct btrfs_key key;
707 int ret = 0;
708 int i;
709 u32 nritems;
710
711 nritems = btrfs_header_nritems(leaf);
712 for (i = 0; i < nritems; i++) {
713 btrfs_item_key_to_cpu(leaf, &key, i);
714 switch (key.type) {
715 case BTRFS_BLOCK_GROUP_ITEM_KEY:
716 pthread_mutex_lock(&rc->rc_lock);
717 ret = process_block_group_item(&rc->bg, leaf, &key, i);
718 pthread_mutex_unlock(&rc->rc_lock);
719 break;
720 case BTRFS_CHUNK_ITEM_KEY:
721 pthread_mutex_lock(&rc->rc_lock);
722 ret = process_chunk_item(&rc->chunk, leaf, &key, i);
723 pthread_mutex_unlock(&rc->rc_lock);
724 break;
725 case BTRFS_DEV_EXTENT_KEY:
726 pthread_mutex_lock(&rc->rc_lock);
727 ret = process_device_extent_item(&rc->devext, leaf,
728 &key, i);
729 pthread_mutex_unlock(&rc->rc_lock);
730 break;
731 }
732 if (ret)
733 break;
734 }
735 return ret;
736 }
737
738 static inline int is_super_block_address(u64 offset)
739 {
740 int i;
741
742 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
743 if (offset == btrfs_sb_offset(i))
744 return 1;
745 }
746 return 0;
747 }
748
749 static int scan_one_device(void *dev_scan_struct)
750 {
751 struct extent_buffer *buf;
752 u64 bytenr;
753 int ret = 0;
754 struct device_scan *dev_scan = (struct device_scan *)dev_scan_struct;
755 struct recover_control *rc = dev_scan->rc;
756 struct btrfs_device *device = dev_scan->dev;
757 int fd = dev_scan->fd;
758 int oldtype;
759
760 ret = pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &oldtype);
761 if (ret)
762 return 1;
763
764 buf = malloc(sizeof(*buf) + rc->nodesize);
765 if (!buf)
766 return -ENOMEM;
767 buf->len = rc->nodesize;
768
769 bytenr = 0;
770 while (1) {
771 dev_scan->bytenr = bytenr;
772
773 if (is_super_block_address(bytenr))
774 bytenr += rc->sectorsize;
775
776 if (pread64(fd, buf->data, rc->nodesize, bytenr) <
777 rc->nodesize)
778 break;
779
780 if (memcmp_extent_buffer(buf, rc->fs_devices->fsid,
781 btrfs_header_fsid(),
782 BTRFS_FSID_SIZE)) {
783 bytenr += rc->sectorsize;
784 continue;
785 }
786
787 if (verify_tree_block_csum_silent(buf, rc->csum_size)) {
788 bytenr += rc->sectorsize;
789 continue;
790 }
791
792 pthread_mutex_lock(&rc->rc_lock);
793 ret = process_extent_buffer(&rc->eb_cache, buf, device, bytenr);
794 pthread_mutex_unlock(&rc->rc_lock);
795 if (ret)
796 goto out;
797
798 if (btrfs_header_level(buf) != 0)
799 goto next_node;
800
801 switch (btrfs_header_owner(buf)) {
802 case BTRFS_EXTENT_TREE_OBJECTID:
803 case BTRFS_DEV_TREE_OBJECTID:
804 /* different tree use different generation */
805 if (btrfs_header_generation(buf) > rc->generation)
806 break;
807 ret = extract_metadata_record(rc, buf);
808 if (ret)
809 goto out;
810 break;
811 case BTRFS_CHUNK_TREE_OBJECTID:
812 if (btrfs_header_generation(buf) >
813 rc->chunk_root_generation)
814 break;
815 ret = extract_metadata_record(rc, buf);
816 if (ret)
817 goto out;
818 break;
819 }
820 next_node:
821 bytenr += rc->nodesize;
822 }
823 out:
824 close(fd);
825 free(buf);
826 return ret;
827 }
828
829 static int scan_devices(struct recover_control *rc)
830 {
831 int ret = 0;
832 int fd;
833 struct btrfs_device *dev;
834 struct device_scan *dev_scans;
835 pthread_t *t_scans;
836 long *t_rets;
837 int devnr = 0;
838 int devidx = 0;
839 int i;
840 int all_done;
841
842 list_for_each_entry(dev, &rc->fs_devices->devices, dev_list)
843 devnr++;
844 dev_scans = (struct device_scan *)malloc(sizeof(struct device_scan)
845 * devnr);
846 if (!dev_scans)
847 return -ENOMEM;
848 t_scans = (pthread_t *)malloc(sizeof(pthread_t) * devnr);
849 if (!t_scans) {
850 free(dev_scans);
851 return -ENOMEM;
852 }
853 t_rets = (long *)malloc(sizeof(long) * devnr);
854 if (!t_rets) {
855 free(dev_scans);
856 free(t_scans);
857 return -ENOMEM;
858 }
859
860 list_for_each_entry(dev, &rc->fs_devices->devices, dev_list) {
861 fd = open(dev->name, O_RDONLY);
862 if (fd < 0) {
863 fprintf(stderr, "Failed to open device %s\n",
864 dev->name);
865 ret = 1;
866 goto out2;
867 }
868 dev_scans[devidx].rc = rc;
869 dev_scans[devidx].dev = dev;
870 dev_scans[devidx].fd = fd;
871 dev_scans[devidx].bytenr = -1;
872 devidx++;
873 }
874
875 for (i = 0; i < devidx; i++) {
876 ret = pthread_create(&t_scans[i], NULL,
877 (void *)scan_one_device,
878 (void *)&dev_scans[i]);
879 if (ret)
880 goto out1;
881
882 dev_scans[i].bytenr = 0;
883 }
884
885 while (1) {
886 all_done = 1;
887 for (i = 0; i < devidx; i++) {
888 if (dev_scans[i].bytenr == -1)
889 continue;
890 ret = pthread_tryjoin_np(t_scans[i],
891 (void **)&t_rets[i]);
892 if (ret == EBUSY) {
893 all_done = 0;
894 continue;
895 }
896 if (ret || t_rets[i]) {
897 ret = 1;
898 goto out1;
899 }
900 dev_scans[i].bytenr = -1;
901 }
902
903 printf("\rScanning: ");
904 for (i = 0; i < devidx; i++) {
905 if (dev_scans[i].bytenr == -1)
906 printf("%sDONE in dev%d",
907 i ? ", " : "", i);
908 else
909 printf("%s%llu in dev%d",
910 i ? ", " : "", dev_scans[i].bytenr, i);
911 }
912 /* clear chars if exist in tail */
913 printf(" ");
914 printf("\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b\b");
915 fflush(stdout);
916
917 if (all_done) {
918 printf("\n");
919 break;
920 }
921
922 sleep(1);
923 }
924 out1:
925 for (i = 0; i < devidx; i++) {
926 if (dev_scans[i].bytenr == -1)
927 continue;
928 pthread_cancel(t_scans[i]);
929 }
930 out2:
931 free(dev_scans);
932 free(t_scans);
933 free(t_rets);
934 return !!ret;
935 }
936
937 static int build_device_map_by_chunk_record(struct btrfs_root *root,
938 struct chunk_record *chunk)
939 {
940 int ret = 0;
941 int i;
942 u64 devid;
943 u8 uuid[BTRFS_UUID_SIZE];
944 u16 num_stripes;
945 struct btrfs_mapping_tree *map_tree;
946 struct map_lookup *map;
947 struct stripe *stripe;
948
949 map_tree = &root->fs_info->mapping_tree;
950 num_stripes = chunk->num_stripes;
951 map = malloc(btrfs_map_lookup_size(num_stripes));
952 if (!map)
953 return -ENOMEM;
954 map->ce.start = chunk->offset;
955 map->ce.size = chunk->length;
956 map->num_stripes = num_stripes;
957 map->io_width = chunk->io_width;
958 map->io_align = chunk->io_align;
959 map->sector_size = chunk->sector_size;
960 map->stripe_len = chunk->stripe_len;
961 map->type = chunk->type_flags;
962 map->sub_stripes = chunk->sub_stripes;
963
964 for (i = 0, stripe = chunk->stripes; i < num_stripes; i++, stripe++) {
965 devid = stripe->devid;
966 memcpy(uuid, stripe->dev_uuid, BTRFS_UUID_SIZE);
967 map->stripes[i].physical = stripe->offset;
968 map->stripes[i].dev = btrfs_find_device(root, devid,
969 uuid, NULL);
970 if (!map->stripes[i].dev) {
971 free(map);
972 return -EIO;
973 }
974 }
975
976 ret = insert_cache_extent(&map_tree->cache_tree, &map->ce);
977 return ret;
978 }
979
980 static int build_device_maps_by_chunk_records(struct recover_control *rc,
981 struct btrfs_root *root)
982 {
983 int ret = 0;
984 struct chunk_record *chunk;
985
986 list_for_each_entry(chunk, &rc->good_chunks, list) {
987 ret = build_device_map_by_chunk_record(root, chunk);
988 if (ret)
989 return ret;
990 }
991 list_for_each_entry(chunk, &rc->rebuild_chunks, list) {
992 ret = build_device_map_by_chunk_record(root, chunk);
993 if (ret)
994 return ret;
995 }
996 return ret;
997 }
998
999 static int block_group_remove_all_extent_items(struct btrfs_trans_handle *trans,
1000 struct btrfs_root *root,
1001 struct block_group_record *bg)
1002 {
1003 struct btrfs_fs_info *fs_info = root->fs_info;
1004 struct btrfs_key key;
1005 struct btrfs_path path;
1006 struct extent_buffer *leaf;
1007 u64 start = bg->objectid;
1008 u64 end = bg->objectid + bg->offset;
1009 u64 old_val;
1010 int nitems;
1011 int ret;
1012 int i;
1013 int del_s, del_nr;
1014
1015 btrfs_init_path(&path);
1016 root = root->fs_info->extent_root;
1017
1018 key.objectid = start;
1019 key.offset = 0;
1020 key.type = BTRFS_EXTENT_ITEM_KEY;
1021 again:
1022 ret = btrfs_search_slot(trans, root, &key, &path, -1, 1);
1023 if (ret < 0)
1024 goto err;
1025 else if (ret > 0)
1026 ret = 0;
1027
1028 leaf = path.nodes[0];
1029 nitems = btrfs_header_nritems(leaf);
1030 if (!nitems) {
1031 /* The tree is empty. */
1032 ret = 0;
1033 goto err;
1034 }
1035
1036 if (path.slots[0] >= nitems) {
1037 ret = btrfs_next_leaf(root, &path);
1038 if (ret < 0)
1039 goto err;
1040 if (ret > 0) {
1041 ret = 0;
1042 goto err;
1043 }
1044 leaf = path.nodes[0];
1045 btrfs_item_key_to_cpu(leaf, &key, 0);
1046 if (key.objectid >= end)
1047 goto err;
1048 btrfs_release_path(&path);
1049 goto again;
1050 }
1051
1052 del_nr = 0;
1053 del_s = -1;
1054 for (i = path.slots[0]; i < nitems; i++) {
1055 btrfs_item_key_to_cpu(leaf, &key, i);
1056 if (key.objectid >= end)
1057 break;
1058
1059 if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) {
1060 if (del_nr == 0)
1061 continue;
1062 else
1063 break;
1064 }
1065
1066 if (del_s == -1)
1067 del_s = i;
1068 del_nr++;
1069 if (key.type == BTRFS_EXTENT_ITEM_KEY ||
1070 key.type == BTRFS_METADATA_ITEM_KEY) {
1071 old_val = btrfs_super_bytes_used(fs_info->super_copy);
1072 if (key.type == BTRFS_METADATA_ITEM_KEY)
1073 old_val += root->nodesize;
1074 else
1075 old_val += key.offset;
1076 btrfs_set_super_bytes_used(fs_info->super_copy,
1077 old_val);
1078 }
1079 }
1080
1081 if (del_nr) {
1082 ret = btrfs_del_items(trans, root, &path, del_s, del_nr);
1083 if (ret)
1084 goto err;
1085 }
1086
1087 if (key.objectid < end) {
1088 if (key.type == BTRFS_BLOCK_GROUP_ITEM_KEY) {
1089 key.objectid += root->sectorsize;
1090 key.type = BTRFS_EXTENT_ITEM_KEY;
1091 key.offset = 0;
1092 }
1093 btrfs_release_path(&path);
1094 goto again;
1095 }
1096 err:
1097 btrfs_release_path(&path);
1098 return ret;
1099 }
1100
1101 static int block_group_free_all_extent(struct btrfs_root *root,
1102 struct block_group_record *bg)
1103 {
1104 struct btrfs_block_group_cache *cache;
1105 struct btrfs_fs_info *info;
1106 u64 start;
1107 u64 end;
1108
1109 info = root->fs_info;
1110 cache = btrfs_lookup_block_group(info, bg->objectid);
1111 if (!cache)
1112 return -ENOENT;
1113
1114 start = cache->key.objectid;
1115 end = start + cache->key.offset - 1;
1116
1117 set_extent_bits(&info->block_group_cache, start, end,
1118 BLOCK_GROUP_DIRTY);
1119 set_extent_dirty(&info->free_space_cache, start, end);
1120
1121 btrfs_set_block_group_used(&cache->item, 0);
1122
1123 return 0;
1124 }
1125
1126 static int remove_chunk_extent_item(struct btrfs_trans_handle *trans,
1127 struct recover_control *rc,
1128 struct btrfs_root *root)
1129 {
1130 struct chunk_record *chunk;
1131 int ret = 0;
1132
1133 list_for_each_entry(chunk, &rc->good_chunks, list) {
1134 if (!(chunk->type_flags & BTRFS_BLOCK_GROUP_SYSTEM))
1135 continue;
1136 ret = block_group_remove_all_extent_items(trans, root,
1137 chunk->bg_rec);
1138 if (ret)
1139 return ret;
1140
1141 ret = block_group_free_all_extent(root, chunk->bg_rec);
1142 if (ret)
1143 return ret;
1144 }
1145 return ret;
1146 }
1147
1148 static int __rebuild_chunk_root(struct btrfs_trans_handle *trans,
1149 struct recover_control *rc,
1150 struct btrfs_root *root)
1151 {
1152 u64 min_devid = -1;
1153 struct btrfs_device *dev;
1154 struct extent_buffer *cow;
1155 struct btrfs_disk_key disk_key;
1156 int ret = 0;
1157
1158 list_for_each_entry(dev, &rc->fs_devices->devices, dev_list) {
1159 if (min_devid > dev->devid)
1160 min_devid = dev->devid;
1161 }
1162 btrfs_set_disk_key_objectid(&disk_key, BTRFS_DEV_ITEMS_OBJECTID);
1163 btrfs_set_disk_key_type(&disk_key, BTRFS_DEV_ITEM_KEY);
1164 btrfs_set_disk_key_offset(&disk_key, min_devid);
1165
1166 cow = btrfs_alloc_free_block(trans, root, root->nodesize,
1167 BTRFS_CHUNK_TREE_OBJECTID,
1168 &disk_key, 0, 0, 0);
1169 btrfs_set_header_bytenr(cow, cow->start);
1170 btrfs_set_header_generation(cow, trans->transid);
1171 btrfs_set_header_nritems(cow, 0);
1172 btrfs_set_header_level(cow, 0);
1173 btrfs_set_header_backref_rev(cow, BTRFS_MIXED_BACKREF_REV);
1174 btrfs_set_header_owner(cow, BTRFS_CHUNK_TREE_OBJECTID);
1175 write_extent_buffer(cow, root->fs_info->fsid,
1176 btrfs_header_fsid(), BTRFS_FSID_SIZE);
1177
1178 write_extent_buffer(cow, root->fs_info->chunk_tree_uuid,
1179 btrfs_header_chunk_tree_uuid(cow),
1180 BTRFS_UUID_SIZE);
1181
1182 root->node = cow;
1183 btrfs_mark_buffer_dirty(cow);
1184
1185 return ret;
1186 }
1187
1188 static int __rebuild_device_items(struct btrfs_trans_handle *trans,
1189 struct recover_control *rc,
1190 struct btrfs_root *root)
1191 {
1192 struct btrfs_device *dev;
1193 struct btrfs_key key;
1194 struct btrfs_dev_item dev_item_tmp;
1195 struct btrfs_dev_item *dev_item = &dev_item_tmp;
1196 int ret = 0;
1197
1198 list_for_each_entry(dev, &rc->fs_devices->devices, dev_list) {
1199 key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
1200 key.type = BTRFS_DEV_ITEM_KEY;
1201 key.offset = dev->devid;
1202
1203 btrfs_set_stack_device_generation(dev_item, 0);
1204 btrfs_set_stack_device_type(dev_item, dev->type);
1205 btrfs_set_stack_device_id(dev_item, dev->devid);
1206 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1207 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1208 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1209 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1210 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1211 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1212 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1213
1214 ret = btrfs_insert_item(trans, root, &key,
1215 dev_item, sizeof(*dev_item));
1216 }
1217
1218 return ret;
1219 }
1220
1221 static int __insert_chunk_item(struct btrfs_trans_handle *trans,
1222 struct chunk_record *chunk_rec,
1223 struct btrfs_root *chunk_root)
1224 {
1225 struct btrfs_key key;
1226 struct btrfs_chunk *chunk = NULL;
1227 int ret = 0;
1228
1229 chunk = create_chunk_item(chunk_rec);
1230 if (!chunk)
1231 return -ENOMEM;
1232 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
1233 key.type = BTRFS_CHUNK_ITEM_KEY;
1234 key.offset = chunk_rec->offset;
1235
1236 ret = btrfs_insert_item(trans, chunk_root, &key, chunk,
1237 btrfs_chunk_item_size(chunk_rec->num_stripes));
1238 free(chunk);
1239 return ret;
1240 }
1241
1242 static int __rebuild_chunk_items(struct btrfs_trans_handle *trans,
1243 struct recover_control *rc,
1244 struct btrfs_root *root)
1245 {
1246 struct btrfs_root *chunk_root;
1247 struct chunk_record *chunk_rec;
1248 int ret;
1249
1250 chunk_root = root->fs_info->chunk_root;
1251
1252 list_for_each_entry(chunk_rec, &rc->good_chunks, list) {
1253 ret = __insert_chunk_item(trans, chunk_rec, chunk_root);
1254 if (ret)
1255 return ret;
1256 }
1257 list_for_each_entry(chunk_rec, &rc->rebuild_chunks, list) {
1258 ret = __insert_chunk_item(trans, chunk_rec, chunk_root);
1259 if (ret)
1260 return ret;
1261 }
1262 return 0;
1263 }
1264
1265 static int rebuild_chunk_tree(struct btrfs_trans_handle *trans,
1266 struct recover_control *rc,
1267 struct btrfs_root *root)
1268 {
1269 int ret = 0;
1270
1271 root = root->fs_info->chunk_root;
1272
1273 ret = __rebuild_chunk_root(trans, rc, root);
1274 if (ret)
1275 return ret;
1276
1277 ret = __rebuild_device_items(trans, rc, root);
1278 if (ret)
1279 return ret;
1280
1281 ret = __rebuild_chunk_items(trans, rc, root);
1282
1283 return ret;
1284 }
1285
1286 static int rebuild_sys_array(struct recover_control *rc,
1287 struct btrfs_root *root)
1288 {
1289 struct btrfs_chunk *chunk;
1290 struct btrfs_key key;
1291 struct chunk_record *chunk_rec;
1292 int ret = 0;
1293 u16 num_stripes;
1294
1295 btrfs_set_super_sys_array_size(root->fs_info->super_copy, 0);
1296
1297 list_for_each_entry(chunk_rec, &rc->good_chunks, list) {
1298 if (!(chunk_rec->type_flags & BTRFS_BLOCK_GROUP_SYSTEM))
1299 continue;
1300
1301 num_stripes = chunk_rec->num_stripes;
1302 chunk = create_chunk_item(chunk_rec);
1303 if (!chunk) {
1304 ret = -ENOMEM;
1305 break;
1306 }
1307
1308 key.objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
1309 key.type = BTRFS_CHUNK_ITEM_KEY;
1310 key.offset = chunk_rec->offset;
1311
1312 ret = btrfs_add_system_chunk(root, &key, chunk,
1313 btrfs_chunk_item_size(num_stripes));
1314 free(chunk);
1315 if (ret)
1316 break;
1317 }
1318 return ret;
1319
1320 }
1321
1322 static int calculate_bg_used(struct btrfs_root *extent_root,
1323 struct chunk_record *chunk_rec,
1324 struct btrfs_path *path,
1325 u64 *used)
1326 {
1327 struct extent_buffer *node;
1328 struct btrfs_key found_key;
1329 int slot;
1330 int ret = 0;
1331 u64 used_ret = 0;
1332
1333 while (1) {
1334 node = path->nodes[0];
1335 slot = path->slots[0];
1336 btrfs_item_key_to_cpu(node, &found_key, slot);
1337 if (found_key.objectid >= chunk_rec->offset + chunk_rec->length)
1338 break;
1339 if (found_key.type != BTRFS_METADATA_ITEM_KEY &&
1340 found_key.type != BTRFS_EXTENT_DATA_KEY)
1341 goto next;
1342 if (found_key.type == BTRFS_METADATA_ITEM_KEY)
1343 used_ret += extent_root->nodesize;
1344 else
1345 used_ret += found_key.offset;
1346 next:
1347 if (slot + 1 < btrfs_header_nritems(node)) {
1348 slot++;
1349 } else {
1350 ret = btrfs_next_leaf(extent_root, path);
1351 if (ret > 0) {
1352 ret = 0;
1353 break;
1354 }
1355 if (ret < 0)
1356 break;
1357 }
1358 }
1359 if (!ret)
1360 *used = used_ret;
1361 return ret;
1362 }
1363
1364 static int __insert_block_group(struct btrfs_trans_handle *trans,
1365 struct chunk_record *chunk_rec,
1366 struct btrfs_root *extent_root,
1367 u64 used)
1368 {
1369 struct btrfs_block_group_item bg_item;
1370 struct btrfs_key key;
1371 int ret = 0;
1372
1373 btrfs_set_block_group_used(&bg_item, used);
1374 btrfs_set_block_group_chunk_objectid(&bg_item, used);
1375 btrfs_set_block_group_flags(&bg_item, chunk_rec->type_flags);
1376 key.objectid = chunk_rec->offset;
1377 key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
1378 key.offset = chunk_rec->length;
1379
1380 ret = btrfs_insert_item(trans, extent_root, &key, &bg_item,
1381 sizeof(bg_item));
1382 return ret;
1383 }
1384
1385 /*
1386 * Search through the extent tree to rebuild the 'used' member of the block
1387 * group.
1388 * However, since block group and extent item shares the extent tree,
1389 * the extent item may also missing.
1390 * In that case, we fill the 'used' with the length of the block group to
1391 * ensure no write into the block group.
1392 * Btrfsck will hate it but we will inform user to call '--init-extent-tree'
1393 * if possible, or just salvage as much data as possible from the fs.
1394 */
1395 static int rebuild_block_group(struct btrfs_trans_handle *trans,
1396 struct recover_control *rc,
1397 struct btrfs_root *root)
1398 {
1399 struct chunk_record *chunk_rec;
1400 struct btrfs_key search_key;
1401 struct btrfs_path path;
1402 u64 used = 0;
1403 int ret = 0;
1404
1405 if (list_empty(&rc->rebuild_chunks))
1406 return 0;
1407
1408 btrfs_init_path(&path);
1409 list_for_each_entry(chunk_rec, &rc->rebuild_chunks, list) {
1410 search_key.objectid = chunk_rec->offset;
1411 search_key.type = BTRFS_EXTENT_ITEM_KEY;
1412 search_key.offset = 0;
1413 ret = btrfs_search_slot(NULL, root->fs_info->extent_root,
1414 &search_key, &path, 0, 0);
1415 if (ret < 0)
1416 goto out;
1417 ret = calculate_bg_used(root->fs_info->extent_root,
1418 chunk_rec, &path, &used);
1419 /*
1420 * Extent tree is damaged, better to rebuild the whole extent
1421 * tree. Currently, change the used to chunk's len to prevent
1422 * write/block reserve happening in that block group.
1423 */
1424 if (ret < 0) {
1425 fprintf(stderr,
1426 "Fail to search extent tree for block group: [%llu,%llu]\n",
1427 chunk_rec->offset,
1428 chunk_rec->offset + chunk_rec->length);
1429 fprintf(stderr,
1430 "Mark the block group full to prevent block rsv problems\n");
1431 used = chunk_rec->length;
1432 }
1433 btrfs_release_path(&path);
1434 ret = __insert_block_group(trans, chunk_rec,
1435 root->fs_info->extent_root,
1436 used);
1437 if (ret < 0)
1438 goto out;
1439 }
1440 out:
1441 btrfs_release_path(&path);
1442 return ret;
1443 }
1444
1445 static struct btrfs_root *
1446 open_ctree_with_broken_chunk(struct recover_control *rc)
1447 {
1448 struct btrfs_fs_info *fs_info;
1449 struct btrfs_super_block *disk_super;
1450 struct extent_buffer *eb;
1451 u32 sectorsize;
1452 u32 nodesize;
1453 u32 leafsize;
1454 u32 stripesize;
1455 int ret;
1456
1457 fs_info = btrfs_new_fs_info(1, BTRFS_SUPER_INFO_OFFSET);
1458 if (!fs_info) {
1459 fprintf(stderr, "Failed to allocate memory for fs_info\n");
1460 return ERR_PTR(-ENOMEM);
1461 }
1462 fs_info->is_chunk_recover = 1;
1463
1464 fs_info->fs_devices = rc->fs_devices;
1465 ret = btrfs_open_devices(fs_info->fs_devices, O_RDWR);
1466 if (ret)
1467 goto out;
1468
1469 disk_super = fs_info->super_copy;
1470 ret = btrfs_read_dev_super(fs_info->fs_devices->latest_bdev,
1471 disk_super, fs_info->super_bytenr,
1472 SBREAD_RECOVER);
1473 if (ret) {
1474 fprintf(stderr, "No valid btrfs found\n");
1475 goto out_devices;
1476 }
1477
1478 memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
1479
1480 ret = btrfs_check_fs_compatibility(disk_super, OPEN_CTREE_WRITES);
1481 if (ret)
1482 goto out_devices;
1483
1484 nodesize = btrfs_super_nodesize(disk_super);
1485 leafsize = btrfs_super_leafsize(disk_super);
1486 sectorsize = btrfs_super_sectorsize(disk_super);
1487 stripesize = btrfs_super_stripesize(disk_super);
1488
1489 btrfs_setup_root(nodesize, leafsize, sectorsize, stripesize,
1490 fs_info->chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1491
1492 ret = build_device_maps_by_chunk_records(rc, fs_info->chunk_root);
1493 if (ret)
1494 goto out_cleanup;
1495
1496 ret = btrfs_setup_all_roots(fs_info, 0, 0);
1497 if (ret)
1498 goto out_failed;
1499
1500 eb = fs_info->tree_root->node;
1501 read_extent_buffer(eb, fs_info->chunk_tree_uuid,
1502 btrfs_header_chunk_tree_uuid(eb),
1503 BTRFS_UUID_SIZE);
1504
1505 return fs_info->fs_root;
1506 out_failed:
1507 btrfs_release_all_roots(fs_info);
1508 out_cleanup:
1509 btrfs_cleanup_all_caches(fs_info);
1510 out_devices:
1511 btrfs_close_devices(fs_info->fs_devices);
1512 out:
1513 btrfs_free_fs_info(fs_info);
1514 return ERR_PTR(ret);
1515 }
1516
1517 static int recover_prepare(struct recover_control *rc, char *path)
1518 {
1519 int ret;
1520 int fd;
1521 struct btrfs_super_block *sb;
1522 char buf[BTRFS_SUPER_INFO_SIZE];
1523 struct btrfs_fs_devices *fs_devices;
1524
1525 ret = 0;
1526 fd = open(path, O_RDONLY);
1527 if (fd < 0) {
1528 fprintf(stderr, "open %s\n error.\n", path);
1529 return -1;
1530 }
1531
1532 sb = (struct btrfs_super_block*)buf;
1533 ret = btrfs_read_dev_super(fd, sb, BTRFS_SUPER_INFO_OFFSET,
1534 SBREAD_RECOVER);
1535 if (ret) {
1536 fprintf(stderr, "read super block error\n");
1537 goto out_close_fd;
1538 }
1539
1540 rc->sectorsize = btrfs_super_sectorsize(sb);
1541 rc->nodesize = btrfs_super_nodesize(sb);
1542 rc->generation = btrfs_super_generation(sb);
1543 rc->chunk_root_generation = btrfs_super_chunk_root_generation(sb);
1544 rc->csum_size = btrfs_super_csum_size(sb);
1545
1546 /* if seed, the result of scanning below will be partial */
1547 if (btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_SEEDING) {
1548 fprintf(stderr, "this device is seed device\n");
1549 ret = -1;
1550 goto out_close_fd;
1551 }
1552
1553 ret = btrfs_scan_fs_devices(fd, path, &fs_devices, 0, SBREAD_RECOVER, 0);
1554 if (ret)
1555 goto out_close_fd;
1556
1557 rc->fs_devices = fs_devices;
1558
1559 if (rc->verbose)
1560 print_all_devices(&rc->fs_devices->devices);
1561
1562 out_close_fd:
1563 close(fd);
1564 return ret;
1565 }
1566
1567 static int btrfs_get_device_extents(u64 chunk_object,
1568 struct list_head *orphan_devexts,
1569 struct list_head *ret_list)
1570 {
1571 struct device_extent_record *devext;
1572 struct device_extent_record *next;
1573 int count = 0;
1574
1575 list_for_each_entry_safe(devext, next, orphan_devexts, chunk_list) {
1576 if (devext->chunk_offset == chunk_object) {
1577 list_move_tail(&devext->chunk_list, ret_list);
1578 count++;
1579 }
1580 }
1581 return count;
1582 }
1583
1584 static int calc_num_stripes(u64 type)
1585 {
1586 if (type & (BTRFS_BLOCK_GROUP_RAID0 |
1587 BTRFS_BLOCK_GROUP_RAID10 |
1588 BTRFS_BLOCK_GROUP_RAID5 |
1589 BTRFS_BLOCK_GROUP_RAID6))
1590 return 0;
1591 else if (type & (BTRFS_BLOCK_GROUP_RAID1 |
1592 BTRFS_BLOCK_GROUP_DUP))
1593 return 2;
1594 else
1595 return 1;
1596 }
1597
1598 static inline int calc_sub_nstripes(u64 type)
1599 {
1600 if (type & BTRFS_BLOCK_GROUP_RAID10)
1601 return 2;
1602 else
1603 return 1;
1604 }
1605
1606 static int btrfs_verify_device_extents(struct block_group_record *bg,
1607 struct list_head *devexts, int ndevexts)
1608 {
1609 struct device_extent_record *devext;
1610 u64 stripe_length;
1611 int expected_num_stripes;
1612
1613 expected_num_stripes = calc_num_stripes(bg->flags);
1614 if (expected_num_stripes && expected_num_stripes != ndevexts)
1615 return 1;
1616
1617 if (check_num_stripes(bg->flags, ndevexts) < 0)
1618 return 1;
1619
1620 stripe_length = calc_stripe_length(bg->flags, bg->offset, ndevexts);
1621 list_for_each_entry(devext, devexts, chunk_list) {
1622 if (devext->length != stripe_length)
1623 return 1;
1624 }
1625 return 0;
1626 }
1627
1628 static int btrfs_rebuild_unordered_chunk_stripes(struct recover_control *rc,
1629 struct chunk_record *chunk)
1630 {
1631 struct device_extent_record *devext;
1632 struct btrfs_device *device;
1633 int i;
1634
1635 devext = list_first_entry(&chunk->dextents, struct device_extent_record,
1636 chunk_list);
1637 for (i = 0; i < chunk->num_stripes; i++) {
1638 chunk->stripes[i].devid = devext->objectid;
1639 chunk->stripes[i].offset = devext->offset;
1640 device = btrfs_find_device_by_devid(rc->fs_devices,
1641 devext->objectid,
1642 0);
1643 if (!device)
1644 return -ENOENT;
1645 BUG_ON(btrfs_find_device_by_devid(rc->fs_devices,
1646 devext->objectid,
1647 1));
1648 memcpy(chunk->stripes[i].dev_uuid, device->uuid,
1649 BTRFS_UUID_SIZE);
1650 devext = list_next_entry(devext, chunk_list);
1651 }
1652 return 0;
1653 }
1654
1655 static int btrfs_calc_stripe_index(struct chunk_record *chunk, u64 logical)
1656 {
1657 u64 offset = logical - chunk->offset;
1658 int stripe_nr;
1659 int nr_data_stripes;
1660 int index;
1661
1662 stripe_nr = offset / chunk->stripe_len;
1663 if (chunk->type_flags & BTRFS_BLOCK_GROUP_RAID0) {
1664 index = stripe_nr % chunk->num_stripes;
1665 } else if (chunk->type_flags & BTRFS_BLOCK_GROUP_RAID10) {
1666 index = stripe_nr % (chunk->num_stripes / chunk->sub_stripes);
1667 index *= chunk->sub_stripes;
1668 } else if (chunk->type_flags & BTRFS_BLOCK_GROUP_RAID5) {
1669 nr_data_stripes = chunk->num_stripes - 1;
1670 index = stripe_nr % nr_data_stripes;
1671 stripe_nr /= nr_data_stripes;
1672 index = (index + stripe_nr) % chunk->num_stripes;
1673 } else if (chunk->type_flags & BTRFS_BLOCK_GROUP_RAID6) {
1674 nr_data_stripes = chunk->num_stripes - 2;
1675 index = stripe_nr % nr_data_stripes;
1676 stripe_nr /= nr_data_stripes;
1677 index = (index + stripe_nr) % chunk->num_stripes;
1678 } else {
1679 return -1;
1680 }
1681 return index;
1682 }
1683
1684 /* calc the logical offset which is the start of the next stripe. */
1685 static inline u64 btrfs_next_stripe_logical_offset(struct chunk_record *chunk,
1686 u64 logical)
1687 {
1688 u64 offset = logical - chunk->offset;
1689
1690 offset /= chunk->stripe_len;
1691 offset *= chunk->stripe_len;
1692 offset += chunk->stripe_len;
1693
1694 return offset + chunk->offset;
1695 }
1696
1697 static int is_extent_record_in_device_extent(struct extent_record *er,
1698 struct device_extent_record *dext,
1699 int *mirror)
1700 {
1701 int i;
1702
1703 for (i = 0; i < er->nmirrors; i++) {
1704 if (er->devices[i]->devid == dext->objectid &&
1705 er->offsets[i] >= dext->offset &&
1706 er->offsets[i] < dext->offset + dext->length) {
1707 *mirror = i;
1708 return 1;
1709 }
1710 }
1711 return 0;
1712 }
1713
1714 static int
1715 btrfs_rebuild_ordered_meta_chunk_stripes(struct recover_control *rc,
1716 struct chunk_record *chunk)
1717 {
1718 u64 start = chunk->offset;
1719 u64 end = chunk->offset + chunk->length;
1720 struct cache_extent *cache;
1721 struct extent_record *er;
1722 struct device_extent_record *devext;
1723 struct device_extent_record *next;
1724 struct btrfs_device *device;
1725 LIST_HEAD(devexts);
1726 int index;
1727 int mirror;
1728 int ret;
1729
1730 cache = lookup_cache_extent(&rc->eb_cache,
1731 start, chunk->length);
1732 if (!cache) {
1733 /* No used space, we can reorder the stripes freely. */
1734 ret = btrfs_rebuild_unordered_chunk_stripes(rc, chunk);
1735 return ret;
1736 }
1737
1738 list_splice_init(&chunk->dextents, &devexts);
1739 again:
1740 er = container_of(cache, struct extent_record, cache);
1741 index = btrfs_calc_stripe_index(chunk, er->cache.start);
1742 BUG_ON(index == -1);
1743 if (chunk->stripes[index].devid)
1744 goto next;
1745 list_for_each_entry_safe(devext, next, &devexts, chunk_list) {
1746 if (is_extent_record_in_device_extent(er, devext, &mirror)) {
1747 chunk->stripes[index].devid = devext->objectid;
1748 chunk->stripes[index].offset = devext->offset;
1749 memcpy(chunk->stripes[index].dev_uuid,
1750 er->devices[mirror]->uuid,
1751 BTRFS_UUID_SIZE);
1752 index++;
1753 list_move(&devext->chunk_list, &chunk->dextents);
1754 }
1755 }
1756 next:
1757 start = btrfs_next_stripe_logical_offset(chunk, er->cache.start);
1758 if (start >= end)
1759 goto no_extent_record;
1760
1761 cache = lookup_cache_extent(&rc->eb_cache, start, end - start);
1762 if (cache)
1763 goto again;
1764 no_extent_record:
1765 if (list_empty(&devexts))
1766 return 0;
1767
1768 if (chunk->type_flags & (BTRFS_BLOCK_GROUP_RAID5 |
1769 BTRFS_BLOCK_GROUP_RAID6)) {
1770 /* Fixme: try to recover the order by the parity block. */
1771 list_splice_tail(&devexts, &chunk->dextents);
1772 return -EINVAL;
1773 }
1774
1775 /* There is no data on the lost stripes, we can reorder them freely. */
1776 for (index = 0; index < chunk->num_stripes; index++) {
1777 if (chunk->stripes[index].devid)
1778 continue;
1779
1780 devext = list_first_entry(&devexts,
1781 struct device_extent_record,
1782 chunk_list);
1783 list_move(&devext->chunk_list, &chunk->dextents);
1784
1785 chunk->stripes[index].devid = devext->objectid;
1786 chunk->stripes[index].offset = devext->offset;
1787 device = btrfs_find_device_by_devid(rc->fs_devices,
1788 devext->objectid,
1789 0);
1790 if (!device) {
1791 list_splice_tail(&devexts, &chunk->dextents);
1792 return -EINVAL;
1793 }
1794 BUG_ON(btrfs_find_device_by_devid(rc->fs_devices,
1795 devext->objectid,
1796 1));
1797 memcpy(chunk->stripes[index].dev_uuid, device->uuid,
1798 BTRFS_UUID_SIZE);
1799 }
1800 return 0;
1801 }
1802
1803 #define BTRFS_ORDERED_RAID (BTRFS_BLOCK_GROUP_RAID0 | \
1804 BTRFS_BLOCK_GROUP_RAID10 | \
1805 BTRFS_BLOCK_GROUP_RAID5 | \
1806 BTRFS_BLOCK_GROUP_RAID6)
1807
1808 static int btrfs_rebuild_chunk_stripes(struct recover_control *rc,
1809 struct chunk_record *chunk)
1810 {
1811 int ret;
1812
1813 /*
1814 * All the data in the system metadata chunk will be dropped,
1815 * so we need not guarantee that the data is right or not, that
1816 * is we can reorder the stripes in the system metadata chunk.
1817 */
1818 if ((chunk->type_flags & BTRFS_BLOCK_GROUP_METADATA) &&
1819 (chunk->type_flags & BTRFS_ORDERED_RAID))
1820 ret =btrfs_rebuild_ordered_meta_chunk_stripes(rc, chunk);
1821 else if ((chunk->type_flags & BTRFS_BLOCK_GROUP_DATA) &&
1822 (chunk->type_flags & BTRFS_ORDERED_RAID))
1823 ret = 1; /* Be handled after the fs is opened. */
1824 else
1825 ret = btrfs_rebuild_unordered_chunk_stripes(rc, chunk);
1826
1827 return ret;
1828 }
1829
1830 static int next_csum(struct btrfs_root *root,
1831 struct extent_buffer **leaf,
1832 struct btrfs_path *path,
1833 int *slot,
1834 u64 *csum_offset,
1835 u32 *tree_csum,
1836 u64 end,
1837 struct btrfs_key *key)
1838 {
1839 int ret = 0;
1840 struct btrfs_root *csum_root = root->fs_info->csum_root;
1841 struct btrfs_csum_item *csum_item;
1842 u32 blocksize = root->sectorsize;
1843 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
1844 int csums_in_item = btrfs_item_size_nr(*leaf, *slot) / csum_size;
1845
1846 if (*csum_offset >= csums_in_item) {
1847 ++(*slot);
1848 *csum_offset = 0;
1849 if (*slot >= btrfs_header_nritems(*leaf)) {
1850 ret = btrfs_next_leaf(csum_root, path);
1851 if (ret < 0)
1852 return -1;
1853 else if (ret > 0)
1854 return 1;
1855 *leaf = path->nodes[0];
1856 *slot = path->slots[0];
1857 }
1858 btrfs_item_key_to_cpu(*leaf, key, *slot);
1859 }
1860
1861 if (key->offset + (*csum_offset) * blocksize >= end)
1862 return 2;
1863 csum_item = btrfs_item_ptr(*leaf, *slot, struct btrfs_csum_item);
1864 csum_item = (struct btrfs_csum_item *)((unsigned char *)csum_item
1865 + (*csum_offset) * csum_size);
1866 read_extent_buffer(*leaf, tree_csum,
1867 (unsigned long)csum_item, csum_size);
1868 return ret;
1869 }
1870
1871 static u64 calc_data_offset(struct btrfs_key *key,
1872 struct chunk_record *chunk,
1873 u64 dev_offset,
1874 u64 csum_offset,
1875 u32 blocksize)
1876 {
1877 u64 data_offset;
1878 int logical_stripe_nr;
1879 int dev_stripe_nr;
1880 int nr_data_stripes;
1881
1882 data_offset = key->offset + csum_offset * blocksize - chunk->offset;
1883 nr_data_stripes = chunk->num_stripes;
1884
1885 if (chunk->type_flags & BTRFS_BLOCK_GROUP_RAID5)
1886 nr_data_stripes -= 1;
1887 else if (chunk->type_flags & BTRFS_BLOCK_GROUP_RAID6)
1888 nr_data_stripes -= 2;
1889
1890 logical_stripe_nr = data_offset / chunk->stripe_len;
1891 dev_stripe_nr = logical_stripe_nr / nr_data_stripes;
1892
1893 data_offset -= logical_stripe_nr * chunk->stripe_len;
1894 data_offset += dev_stripe_nr * chunk->stripe_len;
1895
1896 return dev_offset + data_offset;
1897 }
1898
1899 static int check_one_csum(int fd, u64 start, u32 len, u32 tree_csum)
1900 {
1901 char *data;
1902 int ret = 0;
1903 u32 csum_result = ~(u32)0;
1904
1905 data = malloc(len);
1906 if (!data)
1907 return -1;
1908 ret = pread64(fd, data, len, start);
1909 if (ret < 0 || ret != len) {
1910 ret = -1;
1911 goto out;
1912 }
1913 ret = 0;
1914 csum_result = btrfs_csum_data(data, csum_result, len);
1915 btrfs_csum_final(csum_result, (u8 *)&csum_result);
1916 if (csum_result != tree_csum)
1917 ret = 1;
1918 out:
1919 free(data);
1920 return ret;
1921 }
1922
1923 static u64 item_end_offset(struct btrfs_root *root, struct btrfs_key *key,
1924 struct extent_buffer *leaf, int slot) {
1925 u32 blocksize = root->sectorsize;
1926 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
1927
1928 u64 offset = btrfs_item_size_nr(leaf, slot);
1929 offset /= csum_size;
1930 offset *= blocksize;
1931 offset += key->offset;
1932
1933 return offset;
1934 }
1935
1936 static int insert_stripe(struct list_head *devexts,
1937 struct recover_control *rc,
1938 struct chunk_record *chunk,
1939 int index) {
1940 struct device_extent_record *devext;
1941 struct btrfs_device *dev;
1942
1943 devext = list_entry(devexts->next, struct device_extent_record,
1944 chunk_list);
1945 dev = btrfs_find_device_by_devid(rc->fs_devices, devext->objectid,
1946 0);
1947 if (!dev)
1948 return -ENOENT;
1949 if (btrfs_find_device_by_devid(rc->fs_devices, devext->objectid, 1)) {
1950 error("unexpected: found another device with id %llu",
1951 (unsigned long long)devext->objectid);
1952 return -EINVAL;
1953 }
1954
1955 chunk->stripes[index].devid = devext->objectid;
1956 chunk->stripes[index].offset = devext->offset;
1957 memcpy(chunk->stripes[index].dev_uuid, dev->uuid, BTRFS_UUID_SIZE);
1958
1959 list_move(&devext->chunk_list, &chunk->dextents);
1960
1961 return 0;
1962 }
1963
1964 static inline int count_devext_records(struct list_head *record_list)
1965 {
1966 int num_of_records = 0;
1967 struct device_extent_record *devext;
1968
1969 list_for_each_entry(devext, record_list, chunk_list)
1970 num_of_records++;
1971
1972 return num_of_records;
1973 }
1974
1975 static int fill_chunk_up(struct chunk_record *chunk, struct list_head *devexts,
1976 struct recover_control *rc)
1977 {
1978 int ret = 0;
1979 int i;
1980
1981 for (i = 0; i < chunk->num_stripes; i++) {
1982 if (!chunk->stripes[i].devid) {
1983 ret = insert_stripe(devexts, rc, chunk, i);
1984 if (ret)
1985 break;
1986 }
1987 }
1988
1989 return ret;
1990 }
1991
1992 #define EQUAL_STRIPE (1 << 0)
1993
1994 static int rebuild_raid_data_chunk_stripes(struct recover_control *rc,
1995 struct btrfs_root *root,
1996 struct chunk_record *chunk,
1997 u8 *flags)
1998 {
1999 int i;
2000 int ret = 0;
2001 int slot;
2002 struct btrfs_path path;
2003 struct btrfs_key prev_key;
2004 struct btrfs_key key;
2005 struct btrfs_root *csum_root;
2006 struct extent_buffer *leaf;
2007 struct device_extent_record *devext;
2008 struct device_extent_record *next;
2009 struct btrfs_device *dev;
2010 u64 start = chunk->offset;
2011 u64 end = start + chunk->stripe_len;
2012 u64 chunk_end = chunk->offset + chunk->length;
2013 u64 csum_offset = 0;
2014 u64 data_offset;
2015 u32 blocksize = root->sectorsize;
2016 u32 tree_csum;
2017 int index = 0;
2018 int num_unordered = 0;
2019 LIST_HEAD(unordered);
2020 LIST_HEAD(candidates);
2021
2022 csum_root = root->fs_info->csum_root;
2023 btrfs_init_path(&path);
2024 list_splice_init(&chunk->dextents, &candidates);
2025 again:
2026 if (list_is_last(candidates.next, &candidates))
2027 goto out;
2028
2029 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
2030 key.type = BTRFS_EXTENT_CSUM_KEY;
2031 key.offset = start;
2032
2033 ret = btrfs_search_slot(NULL, csum_root, &key, &path, 0, 0);
2034 if (ret < 0) {
2035 fprintf(stderr, "Search csum failed(%d)\n", ret);
2036 goto fail_out;
2037 }
2038 leaf = path.nodes[0];
2039 slot = path.slots[0];
2040 if (ret > 0) {
2041 if (slot >= btrfs_header_nritems(leaf)) {
2042 ret = btrfs_next_leaf(csum_root, &path);
2043 if (ret < 0) {
2044 fprintf(stderr,
2045 "Walk tree failed(%d)\n", ret);
2046 goto fail_out;
2047 } else if (ret > 0) {
2048 slot = btrfs_header_nritems(leaf) - 1;
2049 btrfs_item_key_to_cpu(leaf, &key, slot);
2050 if (item_end_offset(root, &key, leaf, slot)
2051 > start) {
2052 csum_offset = start - key.offset;
2053 csum_offset /= blocksize;
2054 goto next_csum;
2055 }
2056 goto next_stripe;
2057 }
2058 leaf = path.nodes[0];
2059 slot = path.slots[0];
2060 }
2061 btrfs_item_key_to_cpu(leaf, &key, slot);
2062 ret = btrfs_previous_item(csum_root, &path, 0,
2063 BTRFS_EXTENT_CSUM_KEY);
2064 if (ret < 0)
2065 goto fail_out;
2066 else if (ret > 0) {
2067 if (key.offset >= end)
2068 goto next_stripe;
2069 else
2070 goto next_csum;
2071 }
2072 leaf = path.nodes[0];
2073 slot = path.slots[0];
2074
2075 btrfs_item_key_to_cpu(leaf, &prev_key, slot);
2076 if (item_end_offset(root, &prev_key, leaf, slot) > start) {
2077 csum_offset = start - prev_key.offset;
2078 csum_offset /= blocksize;
2079 btrfs_item_key_to_cpu(leaf, &key, slot);
2080 } else {
2081 if (key.offset >= end)
2082 goto next_stripe;
2083 }
2084
2085 if (key.offset + csum_offset * blocksize > chunk_end)
2086 goto out;
2087 }
2088 next_csum:
2089 ret = next_csum(root, &leaf, &path, &slot, &csum_offset, &tree_csum,
2090 end, &key);
2091 if (ret < 0) {
2092 fprintf(stderr, "Fetch csum failed\n");
2093 goto fail_out;
2094 } else if (ret == 1) {
2095 if (!(*flags & EQUAL_STRIPE))
2096 *flags |= EQUAL_STRIPE;
2097 goto out;
2098 } else if (ret == 2)
2099 goto next_stripe;
2100
2101 list_for_each_entry_safe(devext, next, &candidates, chunk_list) {
2102 data_offset = calc_data_offset(&key, chunk, devext->offset,
2103 csum_offset, blocksize);
2104 dev = btrfs_find_device_by_devid(rc->fs_devices,
2105 devext->objectid, 0);
2106 if (!dev) {
2107 ret = 1;
2108 goto fail_out;
2109 }
2110 BUG_ON(btrfs_find_device_by_devid(rc->fs_devices,
2111 devext->objectid, 1));
2112
2113 ret = check_one_csum(dev->fd, data_offset, blocksize,
2114 tree_csum);
2115 if (ret < 0)
2116 goto fail_out;
2117 else if (ret > 0)
2118 list_move(&devext->chunk_list, &unordered);
2119 }
2120
2121 if (list_empty(&candidates)) {
2122 num_unordered = count_devext_records(&unordered);
2123 if (chunk->type_flags & BTRFS_BLOCK_GROUP_RAID6
2124 && num_unordered == 2) {
2125 btrfs_release_path(&path);
2126 ret = fill_chunk_up(chunk, &unordered, rc);
2127 return ret;
2128 }
2129
2130 goto next_stripe;
2131 }
2132
2133 if (list_is_last(candidates.next, &candidates)) {
2134 index = btrfs_calc_stripe_index(chunk,
2135 key.offset + csum_offset * blocksize);
2136 BUG_ON(index == -1);
2137 if (chunk->stripes[index].devid)
2138 goto next_stripe;
2139 ret = insert_stripe(&candidates, rc, chunk, index);
2140 if (ret)
2141 goto fail_out;
2142 } else {
2143 csum_offset++;
2144 goto next_csum;
2145 }
2146 next_stripe:
2147 start = btrfs_next_stripe_logical_offset(chunk, start);
2148 end = min(start + chunk->stripe_len, chunk_end);
2149 list_splice_init(&unordered, &candidates);
2150 btrfs_release_path(&path);
2151 csum_offset = 0;
2152 if (end < chunk_end)
2153 goto again;
2154 out:
2155 ret = 0;
2156 list_splice_init(&candidates, &unordered);
2157 num_unordered = count_devext_records(&unordered);
2158 if (num_unordered == 1) {
2159 for (i = 0; i < chunk->num_stripes; i++) {
2160 if (!chunk->stripes[i].devid) {
2161 index = i;
2162 break;
2163 }
2164 }
2165 ret = insert_stripe(&unordered, rc, chunk, index);
2166 if (ret)
2167 goto fail_out;
2168 } else {
2169 if ((num_unordered == 2 && chunk->type_flags
2170 & BTRFS_BLOCK_GROUP_RAID5)
2171 || (num_unordered == 3 && chunk->type_flags
2172 & BTRFS_BLOCK_GROUP_RAID6)) {
2173 ret = fill_chunk_up(chunk, &unordered, rc);
2174 }
2175 }
2176 fail_out:
2177 ret = !!ret || (list_empty(&unordered) ? 0 : 1);
2178 list_splice_init(&candidates, &chunk->dextents);
2179 list_splice_init(&unordered, &chunk->dextents);
2180 btrfs_release_path(&path);
2181
2182 return ret;
2183 }
2184
2185 static int btrfs_rebuild_ordered_data_chunk_stripes(struct recover_control *rc,
2186 struct btrfs_root *root)
2187 {
2188 struct chunk_record *chunk;
2189 struct chunk_record *next;
2190 int ret = 0;
2191 int err;
2192 u8 flags;
2193
2194 list_for_each_entry_safe(chunk, next, &rc->unrepaired_chunks, list) {
2195 if ((chunk->type_flags & BTRFS_BLOCK_GROUP_DATA)
2196 && (chunk->type_flags & BTRFS_ORDERED_RAID)) {
2197 flags = 0;
2198 err = rebuild_raid_data_chunk_stripes(rc, root, chunk,
2199 &flags);
2200 if (err) {
2201 list_move(&chunk->list, &rc->bad_chunks);
2202 if (flags & EQUAL_STRIPE)
2203 fprintf(stderr,
2204 "Failure: too many equal stripes in chunk[%llu %llu]\n",
2205 chunk->offset, chunk->length);
2206 if (!ret)
2207 ret = err;
2208 } else
2209 list_move(&chunk->list, &rc->good_chunks);
2210 }
2211 }
2212 return ret;
2213 }
2214
2215 static int btrfs_recover_chunks(struct recover_control *rc)
2216 {
2217 struct chunk_record *chunk;
2218 struct block_group_record *bg;
2219 struct block_group_record *next;
2220 LIST_HEAD(new_chunks);
2221 LIST_HEAD(devexts);
2222 int nstripes;
2223 int ret;
2224
2225 /* create the chunk by block group */
2226 list_for_each_entry_safe(bg, next, &rc->bg.block_groups, list) {
2227 nstripes = btrfs_get_device_extents(bg->objectid,
2228 &rc->devext.no_chunk_orphans,
2229 &devexts);
2230 chunk = calloc(1, btrfs_chunk_record_size(nstripes));
2231 if (!chunk)
2232 return -ENOMEM;
2233 INIT_LIST_HEAD(&chunk->dextents);
2234 chunk->bg_rec = bg;
2235 chunk->cache.start = bg->objectid;
2236 chunk->cache.size = bg->offset;
2237 chunk->objectid = BTRFS_FIRST_CHUNK_TREE_OBJECTID;
2238 chunk->type = BTRFS_CHUNK_ITEM_KEY;
2239 chunk->offset = bg->objectid;
2240 chunk->generation = bg->generation;
2241 chunk->length = bg->offset;
2242 chunk->owner = BTRFS_CHUNK_TREE_OBJECTID;
2243 chunk->stripe_len = BTRFS_STRIPE_LEN;
2244 chunk->type_flags = bg->flags;
2245 chunk->io_width = BTRFS_STRIPE_LEN;
2246 chunk->io_align = BTRFS_STRIPE_LEN;
2247 chunk->sector_size = rc->sectorsize;
2248 chunk->sub_stripes = calc_sub_nstripes(bg->flags);
2249
2250 ret = insert_cache_extent(&rc->chunk, &chunk->cache);
2251 if (ret == -EEXIST) {
2252 error("duplicate entry in cache start %llu size %llu",
2253 (unsigned long long)chunk->cache.start,
2254 (unsigned long long)chunk->cache.size);
2255 free(chunk);
2256 return ret;
2257 }
2258 BUG_ON(ret);
2259
2260 list_del_init(&bg->list);
2261 if (!nstripes) {
2262 list_add_tail(&chunk->list, &rc->bad_chunks);
2263 continue;
2264 }
2265
2266 list_splice_init(&devexts, &chunk->dextents);
2267
2268 ret = btrfs_verify_device_extents(bg, &devexts, nstripes);
2269 if (ret) {
2270 list_add_tail(&chunk->list, &rc->bad_chunks);
2271 continue;
2272 }
2273
2274 chunk->num_stripes = nstripes;
2275 ret = btrfs_rebuild_chunk_stripes(rc, chunk);
2276 if (ret > 0)
2277 list_add_tail(&chunk->list, &rc->unrepaired_chunks);
2278 else if (ret < 0)
2279 list_add_tail(&chunk->list, &rc->bad_chunks);
2280 else
2281 list_add_tail(&chunk->list, &rc->good_chunks);
2282 }
2283 /*
2284 * Don't worry about the lost orphan device extents, they don't
2285 * have its chunk and block group, they must be the old ones that
2286 * we have dropped.
2287 */
2288 return 0;
2289 }
2290
2291 static inline int is_chunk_overlap(struct chunk_record *chunk1,
2292 struct chunk_record *chunk2)
2293 {
2294 if (chunk1->offset >= chunk2->offset + chunk2->length ||
2295 chunk1->offset + chunk1->length <= chunk2->offset)
2296 return 0;
2297 return 1;
2298 }
2299
2300 /* Move invalid(overlap with good chunks) rebuild chunks to bad chunk list */
2301 static void validate_rebuild_chunks(struct recover_control *rc)
2302 {
2303 struct chunk_record *good;
2304 struct chunk_record *rebuild;
2305 struct chunk_record *tmp;
2306
2307 list_for_each_entry_safe(rebuild, tmp, &rc->rebuild_chunks, list) {
2308 list_for_each_entry(good, &rc->good_chunks, list) {
2309 if (is_chunk_overlap(rebuild, good)) {
2310 list_move_tail(&rebuild->list,
2311 &rc->bad_chunks);
2312 break;
2313 }
2314 }
2315 }
2316 }
2317
2318 /*
2319 * Return 0 when successful, < 0 on error and > 0 if aborted by user
2320 */
2321 int btrfs_recover_chunk_tree(char *path, int verbose, int yes)
2322 {
2323 int ret = 0;
2324 struct btrfs_root *root = NULL;
2325 struct btrfs_trans_handle *trans;
2326 struct recover_control rc;
2327
2328 init_recover_control(&rc, verbose, yes);
2329
2330 ret = recover_prepare(&rc, path);
2331 if (ret) {
2332 fprintf(stderr, "recover prepare error\n");
2333 return ret;
2334 }
2335
2336 ret = scan_devices(&rc);
2337 if (ret) {
2338 fprintf(stderr, "scan chunk headers error\n");
2339 goto fail_rc;
2340 }
2341
2342 if (cache_tree_empty(&rc.chunk) &&
2343 cache_tree_empty(&rc.bg.tree) &&
2344 cache_tree_empty(&rc.devext.tree)) {
2345 fprintf(stderr, "no recoverable chunk\n");
2346 goto fail_rc;
2347 }
2348
2349 print_scan_result(&rc);
2350
2351 ret = check_chunks(&rc.chunk, &rc.bg, &rc.devext, &rc.good_chunks,
2352 &rc.bad_chunks, &rc.rebuild_chunks, 1);
2353 if (ret) {
2354 if (!list_empty(&rc.bg.block_groups) ||
2355 !list_empty(&rc.devext.no_chunk_orphans)) {
2356 ret = btrfs_recover_chunks(&rc);
2357 if (ret)
2358 goto fail_rc;
2359 }
2360 } else {
2361 print_check_result(&rc);
2362 printf("Check chunks successfully with no orphans\n");
2363 goto fail_rc;
2364 }
2365 validate_rebuild_chunks(&rc);
2366 print_check_result(&rc);
2367
2368 root = open_ctree_with_broken_chunk(&rc);
2369 if (IS_ERR(root)) {
2370 fprintf(stderr, "open with broken chunk error\n");
2371 ret = PTR_ERR(root);
2372 goto fail_rc;
2373 }
2374
2375 ret = check_all_chunks_by_metadata(&rc, root);
2376 if (ret) {
2377 fprintf(stderr, "The chunks in memory can not match the metadata of the fs. Repair failed.\n");
2378 goto fail_close_ctree;
2379 }
2380
2381 ret = btrfs_rebuild_ordered_data_chunk_stripes(&rc, root);
2382 if (ret) {
2383 fprintf(stderr, "Failed to rebuild ordered chunk stripes.\n");
2384 goto fail_close_ctree;
2385 }
2386
2387 if (!rc.yes) {
2388 ret = ask_user("We are going to rebuild the chunk tree on disk, it might destroy the old metadata on the disk, Are you sure?");
2389 if (!ret) {
2390 ret = 1;
2391 goto fail_close_ctree;
2392 }
2393 }
2394
2395 trans = btrfs_start_transaction(root, 1);
2396 ret = remove_chunk_extent_item(trans, &rc, root);
2397 BUG_ON(ret);
2398
2399 ret = rebuild_chunk_tree(trans, &rc, root);
2400 BUG_ON(ret);
2401
2402 ret = rebuild_sys_array(&rc, root);
2403 BUG_ON(ret);
2404
2405 ret = rebuild_block_group(trans, &rc, root);
2406 if (ret) {
2407 printf("Fail to rebuild block groups.\n");
2408 printf("Recommend to run 'btrfs check --init-extent-tree <dev>' after recovery\n");
2409 }
2410
2411 btrfs_commit_transaction(trans, root);
2412 fail_close_ctree:
2413 close_ctree(root);
2414 fail_rc:
2415 free_recover_control(&rc);
2416 return ret;
2417 }
(deprecated) Btrfs progs developments and patch integration