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Fix missing entries in listing of subvolumes
[btrfs-progs-unstable/devel.git] / disk-io.c
blob408b2d58cab9382a355911f4a0c5fd7deffff0b7
1 /*
2 * Copyright (C) 2007 Oracle. 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 #define _XOPEN_SOURCE 600
20 #define __USE_XOPEN2K
21 #define _GNU_SOURCE 1
22 #include <stdio.h>
23 #include <stdlib.h>
24 #include <sys/types.h>
25 #include <sys/stat.h>
26 #include <fcntl.h>
27 #include <unistd.h>
28 #include "kerncompat.h"
29 #include "radix-tree.h"
30 #include "ctree.h"
31 #include "disk-io.h"
32 #include "volumes.h"
33 #include "transaction.h"
34 #include "crc32c.h"
35 #include "utils.h"
36 #include "print-tree.h"
37
38 static int close_all_devices(struct btrfs_fs_info *fs_info);
39
40 static int check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
41 {
42
43 struct btrfs_fs_devices *fs_devices;
44 int ret = 1;
45
46 if (buf->start != btrfs_header_bytenr(buf)) {
47 printk("Check tree block failed, want=%Lu, have=%Lu\n",
48 buf->start, btrfs_header_bytenr(buf));
49 return ret;
50 }
51
52 fs_devices = root->fs_info->fs_devices;
53 while (fs_devices) {
54 if (!memcmp_extent_buffer(buf, fs_devices->fsid,
55 (unsigned long)btrfs_header_fsid(buf),
56 BTRFS_FSID_SIZE)) {
57 ret = 0;
58 break;
59 }
60 fs_devices = fs_devices->seed;
61 }
62 return ret;
63 }
64
65 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
66 {
67 return crc32c(seed, data, len);
68 }
69
70 void btrfs_csum_final(u32 crc, char *result)
71 {
72 *(__le32 *)result = ~cpu_to_le32(crc);
73 }
74
75 int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
76 int verify)
77 {
78 char *result;
79 u32 len;
80 u32 crc = ~(u32)0;
81
82 result = malloc(csum_size * sizeof(char));
83 if (!result)
84 return 1;
85
86 len = buf->len - BTRFS_CSUM_SIZE;
87 crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
88 btrfs_csum_final(crc, result);
89
90 if (verify) {
91 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
92 printk("checksum verify failed on %llu wanted %X "
93 "found %X\n", (unsigned long long)buf->start,
94 *((int *)result), *((char *)buf->data));
95 free(result);
96 return 1;
97 }
98 } else {
99 write_extent_buffer(buf, result, 0, csum_size);
100 }
101 free(result);
102 return 0;
103 }
104
105 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
106 int verify)
107 {
108 u16 csum_size =
109 btrfs_super_csum_size(&root->fs_info->super_copy);
110 return csum_tree_block_size(buf, csum_size, verify);
111 }
112
113 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
114 u64 bytenr, u32 blocksize)
115 {
116 return find_extent_buffer(&root->fs_info->extent_cache,
117 bytenr, blocksize);
118 }
119
120 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
121 u64 bytenr, u32 blocksize)
122 {
123 return alloc_extent_buffer(&root->fs_info->extent_cache, bytenr,
124 blocksize);
125 }
126
127 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
128 u64 parent_transid)
129 {
130 int ret;
131 struct extent_buffer *eb;
132 u64 length;
133 struct btrfs_multi_bio *multi = NULL;
134 struct btrfs_device *device;
135
136 eb = btrfs_find_tree_block(root, bytenr, blocksize);
137 if (eb && btrfs_buffer_uptodate(eb, parent_transid)) {
138 free_extent_buffer(eb);
139 return 0;
140 }
141
142 length = blocksize;
143 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
144 bytenr, &length, &multi, 0);
145 BUG_ON(ret);
146 device = multi->stripes[0].dev;
147 device->total_ios++;
148 blocksize = min(blocksize, (u32)(64 * 1024));
149 readahead(device->fd, multi->stripes[0].physical, blocksize);
150 kfree(multi);
151 return 0;
152 }
153
154 static int verify_parent_transid(struct extent_io_tree *io_tree,
155 struct extent_buffer *eb, u64 parent_transid,
156 int ignore)
157 {
158 int ret;
159
160 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
161 return 0;
162
163 if (extent_buffer_uptodate(eb) &&
164 btrfs_header_generation(eb) == parent_transid) {
165 ret = 0;
166 goto out;
167 }
168 printk("parent transid verify failed on %llu wanted %llu found %llu\n",
169 (unsigned long long)eb->start,
170 (unsigned long long)parent_transid,
171 (unsigned long long)btrfs_header_generation(eb));
172 if (ignore) {
173 printk("Ignoring transid failure\n");
174 return 0;
175 }
176
177 ret = 1;
178 out:
179 clear_extent_buffer_uptodate(io_tree, eb);
180 return ret;
181
182 }
183
184
185 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
186 u32 blocksize, u64 parent_transid)
187 {
188 int ret;
189 struct extent_buffer *eb;
190 u64 length;
191 u64 best_transid = 0;
192 struct btrfs_multi_bio *multi = NULL;
193 struct btrfs_device *device;
194 int mirror_num = 0;
195 int good_mirror = 0;
196 int num_copies;
197 int ignore = 0;
198
199 eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
200 if (!eb)
201 return NULL;
202
203 if (btrfs_buffer_uptodate(eb, parent_transid))
204 return eb;
205
206 length = blocksize;
207 while (1) {
208 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
209 eb->start, &length, &multi, mirror_num);
210 if (ret) {
211 printk("Couldn't map the block %Lu\n", bytenr);
212 break;
213 }
214 device = multi->stripes[0].dev;
215 eb->fd = device->fd;
216 device->total_ios++;
217 eb->dev_bytenr = multi->stripes[0].physical;
218 kfree(multi);
219 ret = read_extent_from_disk(eb);
220
221 if (ret == 0 && check_tree_block(root, eb) == 0 &&
222 csum_tree_block(root, eb, 1) == 0 &&
223 verify_parent_transid(eb->tree, eb, parent_transid, ignore)
224 == 0) {
225 btrfs_set_buffer_uptodate(eb);
226 return eb;
227 }
228 if (ignore) {
229 if (check_tree_block(root, eb))
230 printk("read block failed check_tree_block\n");
231 else
232 printk("Csum didn't match\n");
233 break;
234 }
235 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
236 eb->start, eb->len);
237 if (num_copies == 1) {
238 ignore = 1;
239 continue;
240 }
241 if (btrfs_header_generation(eb) > best_transid) {
242 best_transid = btrfs_header_generation(eb);
243 good_mirror = mirror_num;
244 }
245 mirror_num++;
246 if (mirror_num > num_copies) {
247 mirror_num = good_mirror;
248 ignore = 1;
249 continue;
250 }
251 }
252 free_extent_buffer(eb);
253 return NULL;
254 }
255
256 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
257 struct extent_buffer *eb)
258 {
259 int ret;
260 int dev_nr;
261 u64 length;
262 struct btrfs_multi_bio *multi = NULL;
263
264 if (check_tree_block(root, eb))
265 BUG();
266 if (!btrfs_buffer_uptodate(eb, trans->transid))
267 BUG();
268
269 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
270 csum_tree_block(root, eb, 0);
271
272 dev_nr = 0;
273 length = eb->len;
274 ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
275 eb->start, &length, &multi, 0);
276
277 while(dev_nr < multi->num_stripes) {
278 BUG_ON(ret);
279 eb->fd = multi->stripes[dev_nr].dev->fd;
280 eb->dev_bytenr = multi->stripes[dev_nr].physical;
281 multi->stripes[dev_nr].dev->total_ios++;
282 dev_nr++;
283 ret = write_extent_to_disk(eb);
284 BUG_ON(ret);
285 }
286 kfree(multi);
287 return 0;
288 }
289
290 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
291 u32 stripesize, struct btrfs_root *root,
292 struct btrfs_fs_info *fs_info, u64 objectid)
293 {
294 root->node = NULL;
295 root->commit_root = NULL;
296 root->sectorsize = sectorsize;
297 root->nodesize = nodesize;
298 root->leafsize = leafsize;
299 root->stripesize = stripesize;
300 root->ref_cows = 0;
301 root->track_dirty = 0;
302
303 root->fs_info = fs_info;
304 root->objectid = objectid;
305 root->last_trans = 0;
306 root->highest_inode = 0;
307 root->last_inode_alloc = 0;
308
309 INIT_LIST_HEAD(&root->dirty_list);
310 memset(&root->root_key, 0, sizeof(root->root_key));
311 memset(&root->root_item, 0, sizeof(root->root_item));
312 root->root_key.objectid = objectid;
313 return 0;
314 }
315
316 static int update_cowonly_root(struct btrfs_trans_handle *trans,
317 struct btrfs_root *root)
318 {
319 int ret;
320 u64 old_root_bytenr;
321 struct btrfs_root *tree_root = root->fs_info->tree_root;
322
323 btrfs_write_dirty_block_groups(trans, root);
324 while(1) {
325 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
326 if (old_root_bytenr == root->node->start)
327 break;
328 btrfs_set_root_bytenr(&root->root_item,
329 root->node->start);
330 btrfs_set_root_generation(&root->root_item,
331 trans->transid);
332 root->root_item.level = btrfs_header_level(root->node);
333 ret = btrfs_update_root(trans, tree_root,
334 &root->root_key,
335 &root->root_item);
336 BUG_ON(ret);
337 btrfs_write_dirty_block_groups(trans, root);
338 }
339 return 0;
340 }
341
342 static int commit_tree_roots(struct btrfs_trans_handle *trans,
343 struct btrfs_fs_info *fs_info)
344 {
345 struct btrfs_root *root;
346 struct list_head *next;
347 struct extent_buffer *eb;
348
349 if (fs_info->readonly)
350 return 0;
351
352 eb = fs_info->tree_root->node;
353 extent_buffer_get(eb);
354 btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
355 free_extent_buffer(eb);
356
357 while(!list_empty(&fs_info->dirty_cowonly_roots)) {
358 next = fs_info->dirty_cowonly_roots.next;
359 list_del_init(next);
360 root = list_entry(next, struct btrfs_root, dirty_list);
361 update_cowonly_root(trans, root);
362 }
363 return 0;
364 }
365
366 static int __commit_transaction(struct btrfs_trans_handle *trans,
367 struct btrfs_root *root)
368 {
369 u64 start;
370 u64 end;
371 struct extent_buffer *eb;
372 struct extent_io_tree *tree = &root->fs_info->extent_cache;
373 int ret;
374
375 while(1) {
376 ret = find_first_extent_bit(tree, 0, &start, &end,
377 EXTENT_DIRTY);
378 if (ret)
379 break;
380 while(start <= end) {
381 eb = find_first_extent_buffer(tree, start);
382 BUG_ON(!eb || eb->start != start);
383 ret = write_tree_block(trans, root, eb);
384 BUG_ON(ret);
385 start += eb->len;
386 clear_extent_buffer_dirty(eb);
387 free_extent_buffer(eb);
388 }
389 }
390 return 0;
391 }
392
393 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
394 struct btrfs_root *root)
395 {
396 u64 transid = trans->transid;
397 int ret = 0;
398 struct btrfs_fs_info *fs_info = root->fs_info;
399
400 if (root->commit_root == root->node)
401 goto commit_tree;
402
403 free_extent_buffer(root->commit_root);
404 root->commit_root = NULL;
405
406 btrfs_set_root_bytenr(&root->root_item, root->node->start);
407 btrfs_set_root_generation(&root->root_item, trans->transid);
408 root->root_item.level = btrfs_header_level(root->node);
409 ret = btrfs_update_root(trans, root->fs_info->tree_root,
410 &root->root_key, &root->root_item);
411 BUG_ON(ret);
412 commit_tree:
413 ret = commit_tree_roots(trans, fs_info);
414 BUG_ON(ret);
415 ret = __commit_transaction(trans, root);
416 BUG_ON(ret);
417 write_ctree_super(trans, root);
418 btrfs_finish_extent_commit(trans, fs_info->extent_root,
419 &fs_info->pinned_extents);
420 btrfs_free_transaction(root, trans);
421 free_extent_buffer(root->commit_root);
422 root->commit_root = NULL;
423 fs_info->running_transaction = NULL;
424 fs_info->last_trans_committed = transid;
425 return 0;
426 }
427
428 static int find_and_setup_root(struct btrfs_root *tree_root,
429 struct btrfs_fs_info *fs_info,
430 u64 objectid, struct btrfs_root *root)
431 {
432 int ret;
433 u32 blocksize;
434 u64 generation;
435
436 __setup_root(tree_root->nodesize, tree_root->leafsize,
437 tree_root->sectorsize, tree_root->stripesize,
438 root, fs_info, objectid);
439 ret = btrfs_find_last_root(tree_root, objectid,
440 &root->root_item, &root->root_key);
441 BUG_ON(ret);
442
443 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
444 generation = btrfs_root_generation(&root->root_item);
445 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
446 blocksize, generation);
447 BUG_ON(!root->node);
448 return 0;
449 }
450
451 static int find_and_setup_log_root(struct btrfs_root *tree_root,
452 struct btrfs_fs_info *fs_info,
453 struct btrfs_super_block *disk_super)
454 {
455 u32 blocksize;
456 u64 blocknr = btrfs_super_log_root(disk_super);
457 struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
458
459 if (blocknr == 0)
460 return 0;
461
462 blocksize = btrfs_level_size(tree_root,
463 btrfs_super_log_root_level(disk_super));
464
465 __setup_root(tree_root->nodesize, tree_root->leafsize,
466 tree_root->sectorsize, tree_root->stripesize,
467 log_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
468
469 log_root->node = read_tree_block(tree_root, blocknr,
470 blocksize,
471 btrfs_super_generation(disk_super) + 1);
472
473 fs_info->log_root_tree = log_root;
474 BUG_ON(!log_root->node);
475 return 0;
476 }
477
478
479 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info,
480 struct btrfs_root *root)
481 {
482 if (root->node)
483 free_extent_buffer(root->node);
484 if (root->commit_root)
485 free_extent_buffer(root->commit_root);
486 kfree(root);
487 return 0;
488 }
489
490 static int free_fs_roots(struct btrfs_fs_info *fs_info)
491 {
492 struct cache_extent *cache;
493 struct btrfs_root *root;
494
495 while (1) {
496 cache = find_first_cache_extent(&fs_info->fs_root_cache, 0);
497 if (!cache)
498 break;
499 root = container_of(cache, struct btrfs_root, cache);
500 remove_cache_extent(&fs_info->fs_root_cache, cache);
501 btrfs_free_fs_root(fs_info, root);
502 }
503 return 0;
504 }
505
506 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
507 struct btrfs_key *location)
508 {
509 struct btrfs_root *root;
510 struct btrfs_root *tree_root = fs_info->tree_root;
511 struct btrfs_path *path;
512 struct extent_buffer *l;
513 u64 generation;
514 u32 blocksize;
515 int ret = 0;
516
517 root = malloc(sizeof(*root));
518 if (!root)
519 return ERR_PTR(-ENOMEM);
520 memset(root, 0, sizeof(*root));
521 if (location->offset == (u64)-1) {
522 ret = find_and_setup_root(tree_root, fs_info,
523 location->objectid, root);
524 if (ret) {
525 free(root);
526 return ERR_PTR(ret);
527 }
528 goto insert;
529 }
530
531 __setup_root(tree_root->nodesize, tree_root->leafsize,
532 tree_root->sectorsize, tree_root->stripesize,
533 root, fs_info, location->objectid);
534
535 path = btrfs_alloc_path();
536 BUG_ON(!path);
537 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
538 if (ret != 0) {
539 if (ret > 0)
540 ret = -ENOENT;
541 goto out;
542 }
543 l = path->nodes[0];
544 read_extent_buffer(l, &root->root_item,
545 btrfs_item_ptr_offset(l, path->slots[0]),
546 sizeof(root->root_item));
547 memcpy(&root->root_key, location, sizeof(*location));
548 ret = 0;
549 out:
550 btrfs_release_path(root, path);
551 btrfs_free_path(path);
552 if (ret) {
553 free(root);
554 return ERR_PTR(ret);
555 }
556 generation = btrfs_root_generation(&root->root_item);
557 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
558 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
559 blocksize, generation);
560 BUG_ON(!root->node);
561 insert:
562 root->ref_cows = 1;
563 return root;
564 }
565
566 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
567 struct btrfs_key *location)
568 {
569 struct btrfs_root *root;
570 struct cache_extent *cache;
571 int ret;
572
573 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
574 return fs_info->tree_root;
575 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
576 return fs_info->extent_root;
577 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
578 return fs_info->chunk_root;
579 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
580 return fs_info->dev_root;
581 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
582 return fs_info->csum_root;
583
584 BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
585 location->offset != (u64)-1);
586
587 cache = find_cache_extent(&fs_info->fs_root_cache,
588 location->objectid, 1);
589 if (cache)
590 return container_of(cache, struct btrfs_root, cache);
591
592 root = btrfs_read_fs_root_no_cache(fs_info, location);
593 if (IS_ERR(root))
594 return root;
595
596 root->cache.start = location->objectid;
597 root->cache.size = 1;
598 ret = insert_existing_cache_extent(&fs_info->fs_root_cache,
599 &root->cache);
600 BUG_ON(ret);
601 return root;
602 }
603
604 struct btrfs_root *__open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
605 u64 root_tree_bytenr, int writes)
606 {
607 u32 sectorsize;
608 u32 nodesize;
609 u32 leafsize;
610 u32 blocksize;
611 u32 stripesize;
612 u64 generation;
613 struct btrfs_key key;
614 struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
615 struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
616 struct btrfs_root *chunk_root = malloc(sizeof(struct btrfs_root));
617 struct btrfs_root *dev_root = malloc(sizeof(struct btrfs_root));
618 struct btrfs_root *csum_root = malloc(sizeof(struct btrfs_root));
619 struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
620 int ret;
621 struct btrfs_super_block *disk_super;
622 struct btrfs_fs_devices *fs_devices = NULL;
623 u64 total_devs;
624 u64 features;
625
626 if (sb_bytenr == 0)
627 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
628
629 ret = btrfs_scan_one_device(fp, path, &fs_devices,
630 &total_devs, sb_bytenr);
631
632 if (ret) {
633 fprintf(stderr, "No valid Btrfs found on %s\n", path);
634 goto out;
635 }
636
637 if (total_devs != 1) {
638 ret = btrfs_scan_for_fsid(fs_devices, total_devs, 1);
639 if (ret)
640 goto out;
641 }
642
643 memset(fs_info, 0, sizeof(*fs_info));
644 fs_info->tree_root = tree_root;
645 fs_info->extent_root = extent_root;
646 fs_info->chunk_root = chunk_root;
647 fs_info->dev_root = dev_root;
648 fs_info->csum_root = csum_root;
649
650 if (!writes)
651 fs_info->readonly = 1;
652
653 extent_io_tree_init(&fs_info->extent_cache);
654 extent_io_tree_init(&fs_info->free_space_cache);
655 extent_io_tree_init(&fs_info->block_group_cache);
656 extent_io_tree_init(&fs_info->pinned_extents);
657 extent_io_tree_init(&fs_info->pending_del);
658 extent_io_tree_init(&fs_info->extent_ins);
659 cache_tree_init(&fs_info->fs_root_cache);
660
661 cache_tree_init(&fs_info->mapping_tree.cache_tree);
662
663 mutex_init(&fs_info->fs_mutex);
664 fs_info->fs_devices = fs_devices;
665 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
666 INIT_LIST_HEAD(&fs_info->space_info);
667
668 __setup_root(4096, 4096, 4096, 4096, tree_root,
669 fs_info, BTRFS_ROOT_TREE_OBJECTID);
670
671 if (writes)
672 ret = btrfs_open_devices(fs_devices, O_RDWR);
673 else
674 ret = btrfs_open_devices(fs_devices, O_RDONLY);
675 if (ret)
676 goto out_cleanup;
677
678 fs_info->super_bytenr = sb_bytenr;
679 disk_super = &fs_info->super_copy;
680 ret = btrfs_read_dev_super(fs_devices->latest_bdev,
681 disk_super, sb_bytenr);
682 if (ret) {
683 printk("No valid btrfs found\n");
684 goto out_devices;
685 }
686
687 memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
688
689
690 features = btrfs_super_incompat_flags(disk_super) &
691 ~BTRFS_FEATURE_INCOMPAT_SUPP;
692 if (features) {
693 printk("couldn't open because of unsupported "
694 "option features (%Lx).\n",
695 (unsigned long long)features);
696 goto out_devices;
697 }
698
699 features = btrfs_super_incompat_flags(disk_super);
700 if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
701 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
702 btrfs_set_super_incompat_flags(disk_super, features);
703 }
704
705 features = btrfs_super_compat_ro_flags(disk_super) &
706 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
707 if (writes && features) {
708 printk("couldn't open RDWR because of unsupported "
709 "option features (%Lx).\n",
710 (unsigned long long)features);
711 goto out_devices;
712 }
713
714 nodesize = btrfs_super_nodesize(disk_super);
715 leafsize = btrfs_super_leafsize(disk_super);
716 sectorsize = btrfs_super_sectorsize(disk_super);
717 stripesize = btrfs_super_stripesize(disk_super);
718 tree_root->nodesize = nodesize;
719 tree_root->leafsize = leafsize;
720 tree_root->sectorsize = sectorsize;
721 tree_root->stripesize = stripesize;
722
723 ret = btrfs_read_sys_array(tree_root);
724 if (ret)
725 goto out_devices;
726 blocksize = btrfs_level_size(tree_root,
727 btrfs_super_chunk_root_level(disk_super));
728 generation = btrfs_super_chunk_root_generation(disk_super);
729
730 __setup_root(nodesize, leafsize, sectorsize, stripesize,
731 chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
732
733 chunk_root->node = read_tree_block(chunk_root,
734 btrfs_super_chunk_root(disk_super),
735 blocksize, generation);
736 if (!chunk_root->node) {
737 printk("Couldn't read chunk root\n");
738 goto out_devices;
739 }
740
741 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
742 (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
743 BTRFS_UUID_SIZE);
744
745 if (!(btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_METADUMP)) {
746 ret = btrfs_read_chunk_tree(chunk_root);
747 if (ret)
748 goto out_chunk;
749 }
750
751 blocksize = btrfs_level_size(tree_root,
752 btrfs_super_root_level(disk_super));
753 generation = btrfs_super_generation(disk_super);
754
755 if (!root_tree_bytenr)
756 root_tree_bytenr = btrfs_super_root(disk_super);
757 tree_root->node = read_tree_block(tree_root,
758 root_tree_bytenr,
759 blocksize, generation);
760 if (!tree_root->node) {
761 printk("Couldn't read tree root\n");
762 goto out_chunk;
763 }
764 ret = find_and_setup_root(tree_root, fs_info,
765 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
766 if (ret) {
767 printk("Couldn't setup extent tree\n");
768 goto out_tree;
769 }
770 extent_root->track_dirty = 1;
771
772 ret = find_and_setup_root(tree_root, fs_info,
773 BTRFS_DEV_TREE_OBJECTID, dev_root);
774 if (ret) {
775 printk("Couldn't setup device tree\n");
776 goto out_extent;
777 }
778 dev_root->track_dirty = 1;
779
780 ret = find_and_setup_root(tree_root, fs_info,
781 BTRFS_CSUM_TREE_OBJECTID, csum_root);
782 if (ret) {
783 printk("Couldn't setup csum tree\n");
784 goto out_dev;
785 }
786 csum_root->track_dirty = 1;
787
788 find_and_setup_log_root(tree_root, fs_info, disk_super);
789
790 fs_info->generation = generation;
791 fs_info->last_trans_committed = generation;
792 btrfs_read_block_groups(fs_info->tree_root);
793
794 key.objectid = BTRFS_FS_TREE_OBJECTID;
795 key.type = BTRFS_ROOT_ITEM_KEY;
796 key.offset = (u64)-1;
797 fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
798
799 if (!fs_info->fs_root)
800 goto out_csum;
801
802 fs_info->data_alloc_profile = (u64)-1;
803 fs_info->metadata_alloc_profile = (u64)-1;
804 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
805
806 return fs_info->fs_root;
807 out_csum:
808 free_extent_buffer(fs_info->csum_root->node);
809 out_dev:
810 free_extent_buffer(fs_info->dev_root->node);
811 out_extent:
812 free_extent_buffer(fs_info->extent_root->node);
813 out_tree:
814 free_extent_buffer(fs_info->tree_root->node);
815 out_chunk:
816 free_extent_buffer(fs_info->chunk_root->node);
817 out_devices:
818 close_all_devices(fs_info);
819 out_cleanup:
820 extent_io_tree_cleanup(&fs_info->extent_cache);
821 extent_io_tree_cleanup(&fs_info->free_space_cache);
822 extent_io_tree_cleanup(&fs_info->block_group_cache);
823 extent_io_tree_cleanup(&fs_info->pinned_extents);
824 extent_io_tree_cleanup(&fs_info->pending_del);
825 extent_io_tree_cleanup(&fs_info->extent_ins);
826 out:
827 free(tree_root);
828 free(extent_root);
829 free(chunk_root);
830 free(dev_root);
831 free(csum_root);
832 free(fs_info);
833 return NULL;
834 }
835
836 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes)
837 {
838 int fp;
839 struct btrfs_root *root;
840 int flags = O_CREAT | O_RDWR;
841
842 if (!writes)
843 flags = O_RDONLY;
844
845 fp = open(filename, flags, 0600);
846 if (fp < 0) {
847 fprintf (stderr, "Could not open %s\n", filename);
848 return NULL;
849 }
850 root = __open_ctree_fd(fp, filename, sb_bytenr, 0, writes);
851 close(fp);
852
853 return root;
854 }
855
856 struct btrfs_root *open_ctree_recovery(const char *filename, u64 sb_bytenr,
857 u64 root_tree_bytenr)
858 {
859 int fp;
860 struct btrfs_root *root;
861
862 fp = open(filename, O_RDONLY);
863 if (fp < 0) {
864 fprintf (stderr, "Could not open %s\n", filename);
865 return NULL;
866 }
867 root = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr, 0);
868 close(fp);
869
870 return root;
871 }
872
873 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
874 int writes)
875 {
876 return __open_ctree_fd(fp, path, sb_bytenr, 0, writes);
877 }
878
879 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr)
880 {
881 u8 fsid[BTRFS_FSID_SIZE];
882 struct btrfs_super_block buf;
883 int i;
884 int ret;
885 u64 transid = 0;
886 u64 bytenr;
887
888 if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
889 ret = pread64(fd, &buf, sizeof(buf), sb_bytenr);
890 if (ret < sizeof(buf))
891 return -1;
892
893 if (btrfs_super_bytenr(&buf) != sb_bytenr ||
894 strncmp((char *)(&buf.magic), BTRFS_MAGIC,
895 sizeof(buf.magic)))
896 return -1;
897
898 memcpy(sb, &buf, sizeof(*sb));
899 return 0;
900 }
901
902 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
903 bytenr = btrfs_sb_offset(i);
904 ret = pread64(fd, &buf, sizeof(buf), bytenr);
905 if (ret < sizeof(buf))
906 break;
907
908 if (btrfs_super_bytenr(&buf) != bytenr ||
909 strncmp((char *)(&buf.magic), BTRFS_MAGIC,
910 sizeof(buf.magic)))
911 continue;
912
913 if (i == 0)
914 memcpy(fsid, buf.fsid, sizeof(fsid));
915 else if (memcmp(fsid, buf.fsid, sizeof(fsid)))
916 continue;
917
918 if (btrfs_super_generation(&buf) > transid) {
919 memcpy(sb, &buf, sizeof(*sb));
920 transid = btrfs_super_generation(&buf);
921 }
922 }
923
924 return transid > 0 ? 0 : -1;
925 }
926
927 int write_dev_supers(struct btrfs_root *root, struct btrfs_super_block *sb,
928 struct btrfs_device *device)
929 {
930 u64 bytenr;
931 u32 crc;
932 int i, ret;
933
934 if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
935 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
936 crc = ~(u32)0;
937 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
938 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
939 btrfs_csum_final(crc, (char *)&sb->csum[0]);
940
941 ret = pwrite64(device->fd, sb, BTRFS_SUPER_INFO_SIZE,
942 root->fs_info->super_bytenr);
943 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
944 return 0;
945 }
946
947 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
948 bytenr = btrfs_sb_offset(i);
949 if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes)
950 break;
951
952 btrfs_set_super_bytenr(sb, bytenr);
953
954 crc = ~(u32)0;
955 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
956 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
957 btrfs_csum_final(crc, (char *)&sb->csum[0]);
958
959 ret = pwrite64(device->fd, sb, BTRFS_SUPER_INFO_SIZE, bytenr);
960 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
961 }
962 return 0;
963 }
964
965 int write_all_supers(struct btrfs_root *root)
966 {
967 struct list_head *cur;
968 struct list_head *head = &root->fs_info->fs_devices->devices;
969 struct btrfs_device *dev;
970 struct btrfs_super_block *sb;
971 struct btrfs_dev_item *dev_item;
972 int ret;
973 u64 flags;
974
975 sb = &root->fs_info->super_copy;
976 dev_item = &sb->dev_item;
977 list_for_each(cur, head) {
978 dev = list_entry(cur, struct btrfs_device, dev_list);
979 if (!dev->writeable)
980 continue;
981
982 btrfs_set_stack_device_generation(dev_item, 0);
983 btrfs_set_stack_device_type(dev_item, dev->type);
984 btrfs_set_stack_device_id(dev_item, dev->devid);
985 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
986 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
987 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
988 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
989 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
990 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
991 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
992
993 flags = btrfs_super_flags(sb);
994 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
995
996 ret = write_dev_supers(root, sb, dev);
997 BUG_ON(ret);
998 }
999 return 0;
1000 }
1001
1002 int write_ctree_super(struct btrfs_trans_handle *trans,
1003 struct btrfs_root *root)
1004 {
1005 int ret;
1006 struct btrfs_root *tree_root = root->fs_info->tree_root;
1007 struct btrfs_root *chunk_root = root->fs_info->chunk_root;
1008
1009 if (root->fs_info->readonly)
1010 return 0;
1011
1012 btrfs_set_super_generation(&root->fs_info->super_copy,
1013 trans->transid);
1014 btrfs_set_super_root(&root->fs_info->super_copy,
1015 tree_root->node->start);
1016 btrfs_set_super_root_level(&root->fs_info->super_copy,
1017 btrfs_header_level(tree_root->node));
1018 btrfs_set_super_chunk_root(&root->fs_info->super_copy,
1019 chunk_root->node->start);
1020 btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
1021 btrfs_header_level(chunk_root->node));
1022 btrfs_set_super_chunk_root_generation(&root->fs_info->super_copy,
1023 btrfs_header_generation(chunk_root->node));
1024
1025 ret = write_all_supers(root);
1026 if (ret)
1027 fprintf(stderr, "failed to write new super block err %d\n", ret);
1028 return ret;
1029 }
1030
1031 static int close_all_devices(struct btrfs_fs_info *fs_info)
1032 {
1033 struct list_head *list;
1034 struct list_head *next;
1035 struct btrfs_device *device;
1036
1037 return 0;
1038
1039 list = &fs_info->fs_devices->devices;
1040 list_for_each(next, list) {
1041 device = list_entry(next, struct btrfs_device, dev_list);
1042 close(device->fd);
1043 }
1044 return 0;
1045 }
1046
1047 int close_ctree(struct btrfs_root *root)
1048 {
1049 int ret;
1050 struct btrfs_trans_handle *trans;
1051 struct btrfs_fs_info *fs_info = root->fs_info;
1052
1053 if (fs_info->last_trans_committed !=
1054 fs_info->generation) {
1055 trans = btrfs_start_transaction(root, 1);
1056 btrfs_commit_transaction(trans, root);
1057 trans = btrfs_start_transaction(root, 1);
1058 ret = commit_tree_roots(trans, fs_info);
1059 BUG_ON(ret);
1060 ret = __commit_transaction(trans, root);
1061 BUG_ON(ret);
1062 write_ctree_super(trans, root);
1063 btrfs_free_transaction(root, trans);
1064 }
1065 btrfs_free_block_groups(fs_info);
1066
1067 free_fs_roots(fs_info);
1068
1069 if (fs_info->extent_root->node)
1070 free_extent_buffer(fs_info->extent_root->node);
1071 if (fs_info->tree_root->node)
1072 free_extent_buffer(fs_info->tree_root->node);
1073 if (fs_info->chunk_root->node)
1074 free_extent_buffer(fs_info->chunk_root->node);
1075 if (fs_info->dev_root->node)
1076 free_extent_buffer(fs_info->dev_root->node);
1077 if (fs_info->csum_root->node)
1078 free_extent_buffer(fs_info->csum_root->node);
1079
1080 if (fs_info->log_root_tree) {
1081 if (fs_info->log_root_tree->node)
1082 free_extent_buffer(fs_info->log_root_tree->node);
1083 free(fs_info->log_root_tree);
1084 }
1085
1086 close_all_devices(fs_info);
1087 extent_io_tree_cleanup(&fs_info->extent_cache);
1088 extent_io_tree_cleanup(&fs_info->free_space_cache);
1089 extent_io_tree_cleanup(&fs_info->block_group_cache);
1090 extent_io_tree_cleanup(&fs_info->pinned_extents);
1091 extent_io_tree_cleanup(&fs_info->pending_del);
1092 extent_io_tree_cleanup(&fs_info->extent_ins);
1093
1094 free(fs_info->tree_root);
1095 free(fs_info->extent_root);
1096 free(fs_info->chunk_root);
1097 free(fs_info->dev_root);
1098 free(fs_info->csum_root);
1099 free(fs_info);
1100
1101 return 0;
1102 }
1103
1104 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1105 struct extent_buffer *eb)
1106 {
1107 return clear_extent_buffer_dirty(eb);
1108 }
1109
1110 int wait_on_tree_block_writeback(struct btrfs_root *root,
1111 struct extent_buffer *eb)
1112 {
1113 return 0;
1114 }
1115
1116 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1117 {
1118 set_extent_buffer_dirty(eb);
1119 }
1120
1121 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1122 {
1123 int ret;
1124
1125 ret = extent_buffer_uptodate(buf);
1126 if (!ret)
1127 return ret;
1128
1129 ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1130 return !ret;
1131 }
1132
1133 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1134 {
1135 return set_extent_buffer_uptodate(eb);
1136 }
(deprecated) Btrfs progs developments and patch integration