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btrfs-progs: Convert man page for btrfs-send.
[btrfs-progs-unstable/devel.git] / disk-io.c
blob19b95a724f1b28c316e59b932eb2fe6a5ce55c26
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 check_tree_block(struct btrfs_root *root, struct extent_buffer *buf)
39 {
40
41 struct btrfs_fs_devices *fs_devices;
42 int ret = 1;
43
44 if (buf->start != btrfs_header_bytenr(buf)) {
45 printk("Check tree block failed, want=%Lu, have=%Lu\n",
46 buf->start, btrfs_header_bytenr(buf));
47 return ret;
48 }
49
50 fs_devices = root->fs_info->fs_devices;
51 while (fs_devices) {
52 if (!memcmp_extent_buffer(buf, fs_devices->fsid,
53 btrfs_header_fsid(),
54 BTRFS_FSID_SIZE)) {
55 ret = 0;
56 break;
57 }
58 fs_devices = fs_devices->seed;
59 }
60 return ret;
61 }
62
63 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
64 {
65 return crc32c(seed, data, len);
66 }
67
68 void btrfs_csum_final(u32 crc, char *result)
69 {
70 *(__le32 *)result = ~cpu_to_le32(crc);
71 }
72
73 static int __csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
74 int verify, int silent)
75 {
76 char *result;
77 u32 len;
78 u32 crc = ~(u32)0;
79
80 result = malloc(csum_size * sizeof(char));
81 if (!result)
82 return 1;
83
84 len = buf->len - BTRFS_CSUM_SIZE;
85 crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
86 btrfs_csum_final(crc, result);
87
88 if (verify) {
89 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
90 if (!silent)
91 printk("checksum verify failed on %llu found %08X wanted %08X\n",
92 (unsigned long long)buf->start,
93 *((u32 *)result),
94 *((u32*)(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_size(struct extent_buffer *buf, u16 csum_size, int verify)
106 {
107 return __csum_tree_block_size(buf, csum_size, verify, 0);
108 }
109
110 int verify_tree_block_csum_silent(struct extent_buffer *buf, u16 csum_size)
111 {
112 return __csum_tree_block_size(buf, csum_size, 1, 1);
113 }
114
115 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
116 int verify)
117 {
118 u16 csum_size =
119 btrfs_super_csum_size(root->fs_info->super_copy);
120 return csum_tree_block_size(buf, csum_size, verify);
121 }
122
123 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
124 u64 bytenr, u32 blocksize)
125 {
126 return find_extent_buffer(&root->fs_info->extent_cache,
127 bytenr, blocksize);
128 }
129
130 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
131 u64 bytenr, u32 blocksize)
132 {
133 return alloc_extent_buffer(&root->fs_info->extent_cache, bytenr,
134 blocksize);
135 }
136
137 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
138 u64 parent_transid)
139 {
140 int ret;
141 struct extent_buffer *eb;
142 u64 length;
143 struct btrfs_multi_bio *multi = NULL;
144 struct btrfs_device *device;
145
146 eb = btrfs_find_tree_block(root, bytenr, blocksize);
147 if (eb && btrfs_buffer_uptodate(eb, parent_transid)) {
148 free_extent_buffer(eb);
149 return 0;
150 }
151
152 length = blocksize;
153 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
154 bytenr, &length, &multi, 0, NULL);
155 BUG_ON(ret);
156 device = multi->stripes[0].dev;
157 device->total_ios++;
158 blocksize = min(blocksize, (u32)(64 * 1024));
159 readahead(device->fd, multi->stripes[0].physical, blocksize);
160 kfree(multi);
161 return 0;
162 }
163
164 static int verify_parent_transid(struct extent_io_tree *io_tree,
165 struct extent_buffer *eb, u64 parent_transid,
166 int ignore)
167 {
168 int ret;
169
170 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
171 return 0;
172
173 if (extent_buffer_uptodate(eb) &&
174 btrfs_header_generation(eb) == parent_transid) {
175 ret = 0;
176 goto out;
177 }
178 printk("parent transid verify failed on %llu wanted %llu found %llu\n",
179 (unsigned long long)eb->start,
180 (unsigned long long)parent_transid,
181 (unsigned long long)btrfs_header_generation(eb));
182 if (ignore) {
183 eb->flags |= EXTENT_BAD_TRANSID;
184 printk("Ignoring transid failure\n");
185 return 0;
186 }
187
188 ret = 1;
189 out:
190 clear_extent_buffer_uptodate(io_tree, eb);
191 return ret;
192
193 }
194
195
196 int read_whole_eb(struct btrfs_fs_info *info, struct extent_buffer *eb, int mirror)
197 {
198 unsigned long offset = 0;
199 struct btrfs_multi_bio *multi = NULL;
200 struct btrfs_device *device;
201 int ret = 0;
202 u64 read_len;
203 unsigned long bytes_left = eb->len;
204
205 while (bytes_left) {
206 read_len = bytes_left;
207 device = NULL;
208
209 if (!info->on_restoring) {
210 ret = btrfs_map_block(&info->mapping_tree, READ,
211 eb->start + offset, &read_len, &multi,
212 mirror, NULL);
213 if (ret) {
214 printk("Couldn't map the block %Lu\n", eb->start + offset);
215 kfree(multi);
216 return -EIO;
217 }
218 device = multi->stripes[0].dev;
219
220 if (device->fd == 0) {
221 kfree(multi);
222 return -EIO;
223 }
224
225 eb->fd = device->fd;
226 device->total_ios++;
227 eb->dev_bytenr = multi->stripes[0].physical;
228 kfree(multi);
229 multi = NULL;
230 } else {
231 /* special case for restore metadump */
232 list_for_each_entry(device, &info->fs_devices->devices, dev_list) {
233 if (device->devid == 1)
234 break;
235 }
236
237 eb->fd = device->fd;
238 eb->dev_bytenr = eb->start;
239 device->total_ios++;
240 }
241
242 if (read_len > bytes_left)
243 read_len = bytes_left;
244
245 ret = read_extent_from_disk(eb, offset, read_len);
246 if (ret)
247 return -EIO;
248 offset += read_len;
249 bytes_left -= read_len;
250 }
251 return 0;
252 }
253
254 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
255 u32 blocksize, u64 parent_transid)
256 {
257 int ret;
258 struct extent_buffer *eb;
259 u64 best_transid = 0;
260 int mirror_num = 0;
261 int good_mirror = 0;
262 int num_copies;
263 int ignore = 0;
264
265 eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
266 if (!eb)
267 return NULL;
268
269 if (btrfs_buffer_uptodate(eb, parent_transid))
270 return eb;
271
272 while (1) {
273 ret = read_whole_eb(root->fs_info, eb, mirror_num);
274 if (ret == 0 && check_tree_block(root, eb) == 0 &&
275 csum_tree_block(root, eb, 1) == 0 &&
276 verify_parent_transid(eb->tree, eb, parent_transid, ignore)
277 == 0) {
278 if (eb->flags & EXTENT_BAD_TRANSID &&
279 list_empty(&eb->recow)) {
280 list_add_tail(&eb->recow,
281 &root->fs_info->recow_ebs);
282 eb->refs++;
283 }
284 btrfs_set_buffer_uptodate(eb);
285 return eb;
286 }
287 if (ignore) {
288 if (check_tree_block(root, eb))
289 printk("read block failed check_tree_block\n");
290 else
291 printk("Csum didn't match\n");
292 break;
293 }
294 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
295 eb->start, eb->len);
296 if (num_copies == 1) {
297 ignore = 1;
298 continue;
299 }
300 if (btrfs_header_generation(eb) > best_transid && mirror_num) {
301 best_transid = btrfs_header_generation(eb);
302 good_mirror = mirror_num;
303 }
304 mirror_num++;
305 if (mirror_num > num_copies) {
306 mirror_num = good_mirror;
307 ignore = 1;
308 continue;
309 }
310 }
311 free_extent_buffer(eb);
312 return NULL;
313 }
314
315 int write_and_map_eb(struct btrfs_trans_handle *trans,
316 struct btrfs_root *root,
317 struct extent_buffer *eb)
318 {
319 int ret;
320 int dev_nr;
321 u64 length;
322 u64 *raid_map = NULL;
323 struct btrfs_multi_bio *multi = NULL;
324
325 dev_nr = 0;
326 length = eb->len;
327 ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
328 eb->start, &length, &multi, 0, &raid_map);
329
330 if (raid_map) {
331 ret = write_raid56_with_parity(root->fs_info, eb, multi,
332 length, raid_map);
333 BUG_ON(ret);
334 } else while (dev_nr < multi->num_stripes) {
335 BUG_ON(ret);
336 eb->fd = multi->stripes[dev_nr].dev->fd;
337 eb->dev_bytenr = multi->stripes[dev_nr].physical;
338 multi->stripes[dev_nr].dev->total_ios++;
339 dev_nr++;
340 ret = write_extent_to_disk(eb);
341 BUG_ON(ret);
342 }
343 kfree(multi);
344 return 0;
345 }
346
347 static int write_tree_block(struct btrfs_trans_handle *trans,
348 struct btrfs_root *root,
349 struct extent_buffer *eb)
350 {
351 if (check_tree_block(root, eb))
352 BUG();
353
354 if (!btrfs_buffer_uptodate(eb, trans->transid))
355 BUG();
356
357 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
358 csum_tree_block(root, eb, 0);
359
360 return write_and_map_eb(trans, root, eb);
361 }
362
363 int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
364 u32 stripesize, struct btrfs_root *root,
365 struct btrfs_fs_info *fs_info, u64 objectid)
366 {
367 root->node = NULL;
368 root->commit_root = NULL;
369 root->sectorsize = sectorsize;
370 root->nodesize = nodesize;
371 root->leafsize = leafsize;
372 root->stripesize = stripesize;
373 root->ref_cows = 0;
374 root->track_dirty = 0;
375
376 root->fs_info = fs_info;
377 root->objectid = objectid;
378 root->last_trans = 0;
379 root->highest_inode = 0;
380 root->last_inode_alloc = 0;
381
382 INIT_LIST_HEAD(&root->dirty_list);
383 memset(&root->root_key, 0, sizeof(root->root_key));
384 memset(&root->root_item, 0, sizeof(root->root_item));
385 root->root_key.objectid = objectid;
386 return 0;
387 }
388
389 static int update_cowonly_root(struct btrfs_trans_handle *trans,
390 struct btrfs_root *root)
391 {
392 int ret;
393 u64 old_root_bytenr;
394 struct btrfs_root *tree_root = root->fs_info->tree_root;
395
396 btrfs_write_dirty_block_groups(trans, root);
397 while(1) {
398 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
399 if (old_root_bytenr == root->node->start)
400 break;
401 btrfs_set_root_bytenr(&root->root_item,
402 root->node->start);
403 btrfs_set_root_generation(&root->root_item,
404 trans->transid);
405 root->root_item.level = btrfs_header_level(root->node);
406 ret = btrfs_update_root(trans, tree_root,
407 &root->root_key,
408 &root->root_item);
409 BUG_ON(ret);
410 btrfs_write_dirty_block_groups(trans, root);
411 }
412 return 0;
413 }
414
415 static int commit_tree_roots(struct btrfs_trans_handle *trans,
416 struct btrfs_fs_info *fs_info)
417 {
418 struct btrfs_root *root;
419 struct list_head *next;
420 struct extent_buffer *eb;
421 int ret;
422
423 if (fs_info->readonly)
424 return 0;
425
426 eb = fs_info->tree_root->node;
427 extent_buffer_get(eb);
428 ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
429 free_extent_buffer(eb);
430 if (ret)
431 return ret;
432
433 while(!list_empty(&fs_info->dirty_cowonly_roots)) {
434 next = fs_info->dirty_cowonly_roots.next;
435 list_del_init(next);
436 root = list_entry(next, struct btrfs_root, dirty_list);
437 update_cowonly_root(trans, root);
438 free_extent_buffer(root->commit_root);
439 root->commit_root = NULL;
440 }
441
442 return 0;
443 }
444
445 static int __commit_transaction(struct btrfs_trans_handle *trans,
446 struct btrfs_root *root)
447 {
448 u64 start;
449 u64 end;
450 struct extent_buffer *eb;
451 struct extent_io_tree *tree = &root->fs_info->extent_cache;
452 int ret;
453
454 while(1) {
455 ret = find_first_extent_bit(tree, 0, &start, &end,
456 EXTENT_DIRTY);
457 if (ret)
458 break;
459 while(start <= end) {
460 eb = find_first_extent_buffer(tree, start);
461 BUG_ON(!eb || eb->start != start);
462 ret = write_tree_block(trans, root, eb);
463 BUG_ON(ret);
464 start += eb->len;
465 clear_extent_buffer_dirty(eb);
466 free_extent_buffer(eb);
467 }
468 }
469 return 0;
470 }
471
472 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
473 struct btrfs_root *root)
474 {
475 u64 transid = trans->transid;
476 int ret = 0;
477 struct btrfs_fs_info *fs_info = root->fs_info;
478
479 if (root->commit_root == root->node)
480 goto commit_tree;
481
482 free_extent_buffer(root->commit_root);
483 root->commit_root = NULL;
484
485 btrfs_set_root_bytenr(&root->root_item, root->node->start);
486 btrfs_set_root_generation(&root->root_item, trans->transid);
487 root->root_item.level = btrfs_header_level(root->node);
488 ret = btrfs_update_root(trans, root->fs_info->tree_root,
489 &root->root_key, &root->root_item);
490 BUG_ON(ret);
491 commit_tree:
492 ret = commit_tree_roots(trans, fs_info);
493 BUG_ON(ret);
494 ret = __commit_transaction(trans, root);
495 BUG_ON(ret);
496 write_ctree_super(trans, root);
497 btrfs_finish_extent_commit(trans, fs_info->extent_root,
498 &fs_info->pinned_extents);
499 btrfs_free_transaction(root, trans);
500 free_extent_buffer(root->commit_root);
501 root->commit_root = NULL;
502 fs_info->running_transaction = NULL;
503 fs_info->last_trans_committed = transid;
504 return 0;
505 }
506
507 static int find_and_setup_root(struct btrfs_root *tree_root,
508 struct btrfs_fs_info *fs_info,
509 u64 objectid, struct btrfs_root *root)
510 {
511 int ret;
512 u32 blocksize;
513 u64 generation;
514
515 __setup_root(tree_root->nodesize, tree_root->leafsize,
516 tree_root->sectorsize, tree_root->stripesize,
517 root, fs_info, objectid);
518 ret = btrfs_find_last_root(tree_root, objectid,
519 &root->root_item, &root->root_key);
520 if (ret)
521 return ret;
522
523 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
524 generation = btrfs_root_generation(&root->root_item);
525 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
526 blocksize, generation);
527 if (!extent_buffer_uptodate(root->node))
528 return -EIO;
529
530 return 0;
531 }
532
533 static int find_and_setup_log_root(struct btrfs_root *tree_root,
534 struct btrfs_fs_info *fs_info,
535 struct btrfs_super_block *disk_super)
536 {
537 u32 blocksize;
538 u64 blocknr = btrfs_super_log_root(disk_super);
539 struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
540
541 if (!log_root)
542 return -ENOMEM;
543
544 if (blocknr == 0) {
545 free(log_root);
546 return 0;
547 }
548
549 blocksize = btrfs_level_size(tree_root,
550 btrfs_super_log_root_level(disk_super));
551
552 __setup_root(tree_root->nodesize, tree_root->leafsize,
553 tree_root->sectorsize, tree_root->stripesize,
554 log_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
555
556 log_root->node = read_tree_block(tree_root, blocknr,
557 blocksize,
558 btrfs_super_generation(disk_super) + 1);
559
560 fs_info->log_root_tree = log_root;
561
562 if (!extent_buffer_uptodate(log_root->node)) {
563 free_extent_buffer(log_root->node);
564 free(log_root);
565 fs_info->log_root_tree = NULL;
566 return -EIO;
567 }
568
569 return 0;
570 }
571
572
573 int btrfs_free_fs_root(struct btrfs_root *root)
574 {
575 if (root->node)
576 free_extent_buffer(root->node);
577 if (root->commit_root)
578 free_extent_buffer(root->commit_root);
579 kfree(root);
580 return 0;
581 }
582
583 static void __free_fs_root(struct rb_node *node)
584 {
585 struct btrfs_root *root;
586
587 root = container_of(node, struct btrfs_root, rb_node);
588 btrfs_free_fs_root(root);
589 }
590
591 FREE_RB_BASED_TREE(fs_roots, __free_fs_root);
592
593 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
594 struct btrfs_key *location)
595 {
596 struct btrfs_root *root;
597 struct btrfs_root *tree_root = fs_info->tree_root;
598 struct btrfs_path *path;
599 struct extent_buffer *l;
600 u64 generation;
601 u32 blocksize;
602 int ret = 0;
603
604 root = malloc(sizeof(*root));
605 if (!root)
606 return ERR_PTR(-ENOMEM);
607 memset(root, 0, sizeof(*root));
608 if (location->offset == (u64)-1) {
609 ret = find_and_setup_root(tree_root, fs_info,
610 location->objectid, root);
611 if (ret) {
612 free(root);
613 return ERR_PTR(ret);
614 }
615 goto insert;
616 }
617
618 __setup_root(tree_root->nodesize, tree_root->leafsize,
619 tree_root->sectorsize, tree_root->stripesize,
620 root, fs_info, location->objectid);
621
622 path = btrfs_alloc_path();
623 BUG_ON(!path);
624 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
625 if (ret != 0) {
626 if (ret > 0)
627 ret = -ENOENT;
628 goto out;
629 }
630 l = path->nodes[0];
631 read_extent_buffer(l, &root->root_item,
632 btrfs_item_ptr_offset(l, path->slots[0]),
633 sizeof(root->root_item));
634 memcpy(&root->root_key, location, sizeof(*location));
635 ret = 0;
636 out:
637 btrfs_release_path(path);
638 btrfs_free_path(path);
639 if (ret) {
640 free(root);
641 return ERR_PTR(ret);
642 }
643 generation = btrfs_root_generation(&root->root_item);
644 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
645 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
646 blocksize, generation);
647 if (!root->node) {
648 free(root);
649 return ERR_PTR(-EIO);
650 }
651 insert:
652 root->ref_cows = 1;
653 return root;
654 }
655
656 static int btrfs_fs_roots_compare_objectids(struct rb_node *node,
657 void *data)
658 {
659 u64 objectid = *((u64 *)data);
660 struct btrfs_root *root;
661
662 root = rb_entry(node, struct btrfs_root, rb_node);
663 if (objectid > root->objectid)
664 return 1;
665 else if (objectid < root->objectid)
666 return -1;
667 else
668 return 0;
669 }
670
671 static int btrfs_fs_roots_compare_roots(struct rb_node *node1,
672 struct rb_node *node2)
673 {
674 struct btrfs_root *root;
675
676 root = rb_entry(node2, struct btrfs_root, rb_node);
677 return btrfs_fs_roots_compare_objectids(node1, (void *)&root->objectid);
678 }
679
680 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
681 struct btrfs_key *location)
682 {
683 struct btrfs_root *root;
684 struct rb_node *node;
685 int ret;
686 u64 objectid = location->objectid;
687
688 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
689 return fs_info->tree_root;
690 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
691 return fs_info->extent_root;
692 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
693 return fs_info->chunk_root;
694 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
695 return fs_info->dev_root;
696 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
697 return fs_info->csum_root;
698
699 BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
700 location->offset != (u64)-1);
701
702 node = rb_search(&fs_info->fs_root_tree, (void *)&objectid,
703 btrfs_fs_roots_compare_objectids, NULL);
704 if (node)
705 return container_of(node, struct btrfs_root, rb_node);
706
707 root = btrfs_read_fs_root_no_cache(fs_info, location);
708 if (IS_ERR(root))
709 return root;
710
711 ret = rb_insert(&fs_info->fs_root_tree, &root->rb_node,
712 btrfs_fs_roots_compare_roots);
713 BUG_ON(ret);
714 return root;
715 }
716
717 void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
718 {
719 free(fs_info->tree_root);
720 free(fs_info->extent_root);
721 free(fs_info->chunk_root);
722 free(fs_info->dev_root);
723 free(fs_info->csum_root);
724 free(fs_info->super_copy);
725 free(fs_info->log_root_tree);
726 free(fs_info);
727 }
728
729 struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr)
730 {
731 struct btrfs_fs_info *fs_info;
732
733 fs_info = malloc(sizeof(struct btrfs_fs_info));
734 if (!fs_info)
735 return NULL;
736
737 memset(fs_info, 0, sizeof(struct btrfs_fs_info));
738
739 fs_info->tree_root = malloc(sizeof(struct btrfs_root));
740 fs_info->extent_root = malloc(sizeof(struct btrfs_root));
741 fs_info->chunk_root = malloc(sizeof(struct btrfs_root));
742 fs_info->dev_root = malloc(sizeof(struct btrfs_root));
743 fs_info->csum_root = malloc(sizeof(struct btrfs_root));
744 fs_info->super_copy = malloc(BTRFS_SUPER_INFO_SIZE);
745
746 if (!fs_info->tree_root || !fs_info->extent_root ||
747 !fs_info->chunk_root || !fs_info->dev_root ||
748 !fs_info->csum_root || !fs_info->super_copy)
749 goto free_all;
750
751 memset(fs_info->super_copy, 0, BTRFS_SUPER_INFO_SIZE);
752 memset(fs_info->tree_root, 0, sizeof(struct btrfs_root));
753 memset(fs_info->extent_root, 0, sizeof(struct btrfs_root));
754 memset(fs_info->chunk_root, 0, sizeof(struct btrfs_root));
755 memset(fs_info->dev_root, 0, sizeof(struct btrfs_root));
756 memset(fs_info->csum_root, 0, sizeof(struct btrfs_root));
757
758 extent_io_tree_init(&fs_info->extent_cache);
759 extent_io_tree_init(&fs_info->free_space_cache);
760 extent_io_tree_init(&fs_info->block_group_cache);
761 extent_io_tree_init(&fs_info->pinned_extents);
762 extent_io_tree_init(&fs_info->pending_del);
763 extent_io_tree_init(&fs_info->extent_ins);
764 fs_info->fs_root_tree = RB_ROOT;
765 cache_tree_init(&fs_info->mapping_tree.cache_tree);
766
767 mutex_init(&fs_info->fs_mutex);
768 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
769 INIT_LIST_HEAD(&fs_info->space_info);
770 INIT_LIST_HEAD(&fs_info->recow_ebs);
771
772 if (!writable)
773 fs_info->readonly = 1;
774
775 fs_info->super_bytenr = sb_bytenr;
776 fs_info->data_alloc_profile = (u64)-1;
777 fs_info->metadata_alloc_profile = (u64)-1;
778 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
779 return fs_info;
780 free_all:
781 btrfs_free_fs_info(fs_info);
782 return NULL;
783 }
784
785 int btrfs_check_fs_compatibility(struct btrfs_super_block *sb, int writable)
786 {
787 u64 features;
788
789 features = btrfs_super_incompat_flags(sb) &
790 ~BTRFS_FEATURE_INCOMPAT_SUPP;
791 if (features) {
792 printk("couldn't open because of unsupported "
793 "option features (%Lx).\n",
794 (unsigned long long)features);
795 return -ENOTSUP;
796 }
797
798 features = btrfs_super_incompat_flags(sb);
799 if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
800 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
801 btrfs_set_super_incompat_flags(sb, features);
802 }
803
804 features = btrfs_super_compat_ro_flags(sb) &
805 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
806 if (writable && features) {
807 printk("couldn't open RDWR because of unsupported "
808 "option features (%Lx).\n",
809 (unsigned long long)features);
810 return -ENOTSUP;
811 }
812 return 0;
813 }
814
815 static int find_best_backup_root(struct btrfs_super_block *super)
816 {
817 struct btrfs_root_backup *backup;
818 u64 orig_gen = btrfs_super_generation(super);
819 u64 gen = 0;
820 int best_index = 0;
821 int i;
822
823 for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
824 backup = super->super_roots + i;
825 if (btrfs_backup_tree_root_gen(backup) != orig_gen &&
826 btrfs_backup_tree_root_gen(backup) > gen) {
827 best_index = i;
828 gen = btrfs_backup_tree_root_gen(backup);
829 }
830 }
831 return best_index;
832 }
833
834 int btrfs_setup_all_roots(struct btrfs_fs_info *fs_info, u64 root_tree_bytenr,
835 enum btrfs_open_ctree_flags flags)
836 {
837 struct btrfs_super_block *sb = fs_info->super_copy;
838 struct btrfs_root *root;
839 struct btrfs_key key;
840 u32 sectorsize;
841 u32 nodesize;
842 u32 leafsize;
843 u32 stripesize;
844 u64 generation;
845 u32 blocksize;
846 int ret;
847
848 nodesize = btrfs_super_nodesize(sb);
849 leafsize = btrfs_super_leafsize(sb);
850 sectorsize = btrfs_super_sectorsize(sb);
851 stripesize = btrfs_super_stripesize(sb);
852
853 root = fs_info->tree_root;
854 __setup_root(nodesize, leafsize, sectorsize, stripesize,
855 root, fs_info, BTRFS_ROOT_TREE_OBJECTID);
856 blocksize = btrfs_level_size(root, btrfs_super_root_level(sb));
857 generation = btrfs_super_generation(sb);
858
859 if (!root_tree_bytenr && !(flags & OPEN_CTREE_BACKUP_ROOT)) {
860 root_tree_bytenr = btrfs_super_root(sb);
861 } else if (flags & OPEN_CTREE_BACKUP_ROOT) {
862 struct btrfs_root_backup *backup;
863 int index = find_best_backup_root(sb);
864 if (index >= BTRFS_NUM_BACKUP_ROOTS) {
865 fprintf(stderr, "Invalid backup root number\n");
866 return -EIO;
867 }
868 backup = fs_info->super_copy->super_roots + index;
869 root_tree_bytenr = btrfs_backup_tree_root(backup);
870 generation = btrfs_backup_tree_root_gen(backup);
871 }
872
873 root->node = read_tree_block(root, root_tree_bytenr, blocksize,
874 generation);
875 if (!extent_buffer_uptodate(root->node)) {
876 fprintf(stderr, "Couldn't read tree root\n");
877 return -EIO;
878 }
879
880 ret = find_and_setup_root(root, fs_info, BTRFS_EXTENT_TREE_OBJECTID,
881 fs_info->extent_root);
882 if (ret) {
883 printk("Couldn't setup extent tree\n");
884 if (!(flags & OPEN_CTREE_PARTIAL))
885 return -EIO;
886 /* Need a blank node here just so we don't screw up in the
887 * million of places that assume a root has a valid ->node
888 */
889 fs_info->extent_root->node =
890 btrfs_find_create_tree_block(fs_info->extent_root, 0,
891 leafsize);
892 if (!fs_info->extent_root->node)
893 return -ENOMEM;
894 clear_extent_buffer_uptodate(NULL, fs_info->extent_root->node);
895 }
896 fs_info->extent_root->track_dirty = 1;
897
898 ret = find_and_setup_root(root, fs_info, BTRFS_DEV_TREE_OBJECTID,
899 fs_info->dev_root);
900 if (ret) {
901 printk("Couldn't setup device tree\n");
902 return -EIO;
903 }
904 fs_info->dev_root->track_dirty = 1;
905
906 ret = find_and_setup_root(root, fs_info, BTRFS_CSUM_TREE_OBJECTID,
907 fs_info->csum_root);
908 if (ret) {
909 printk("Couldn't setup csum tree\n");
910 if (!(flags & OPEN_CTREE_PARTIAL))
911 return -EIO;
912 }
913 fs_info->csum_root->track_dirty = 1;
914
915 ret = find_and_setup_log_root(root, fs_info, sb);
916 if (ret) {
917 printk("Couldn't setup log root tree\n");
918 return -EIO;
919 }
920
921 fs_info->generation = generation;
922 fs_info->last_trans_committed = generation;
923 if (extent_buffer_uptodate(fs_info->extent_root->node) &&
924 !(flags & OPEN_CTREE_NO_BLOCK_GROUPS))
925 btrfs_read_block_groups(fs_info->tree_root);
926
927 key.objectid = BTRFS_FS_TREE_OBJECTID;
928 key.type = BTRFS_ROOT_ITEM_KEY;
929 key.offset = (u64)-1;
930 fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
931
932 if (!fs_info->fs_root)
933 return -EIO;
934 return 0;
935 }
936
937 void btrfs_release_all_roots(struct btrfs_fs_info *fs_info)
938 {
939 if (fs_info->csum_root)
940 free_extent_buffer(fs_info->csum_root->node);
941 if (fs_info->dev_root)
942 free_extent_buffer(fs_info->dev_root->node);
943 if (fs_info->extent_root)
944 free_extent_buffer(fs_info->extent_root->node);
945 if (fs_info->tree_root)
946 free_extent_buffer(fs_info->tree_root->node);
947 if (fs_info->log_root_tree)
948 free_extent_buffer(fs_info->log_root_tree->node);
949 if (fs_info->chunk_root)
950 free_extent_buffer(fs_info->chunk_root->node);
951 }
952
953 static void free_map_lookup(struct cache_extent *ce)
954 {
955 struct map_lookup *map;
956
957 map = container_of(ce, struct map_lookup, ce);
958 kfree(map);
959 }
960
961 FREE_EXTENT_CACHE_BASED_TREE(mapping_cache, free_map_lookup);
962
963 void btrfs_cleanup_all_caches(struct btrfs_fs_info *fs_info)
964 {
965 while (!list_empty(&fs_info->recow_ebs)) {
966 struct extent_buffer *eb;
967 eb = list_first_entry(&fs_info->recow_ebs,
968 struct extent_buffer, recow);
969 list_del_init(&eb->recow);
970 free_extent_buffer(eb);
971 }
972 free_mapping_cache_tree(&fs_info->mapping_tree.cache_tree);
973 extent_io_tree_cleanup(&fs_info->extent_cache);
974 extent_io_tree_cleanup(&fs_info->free_space_cache);
975 extent_io_tree_cleanup(&fs_info->block_group_cache);
976 extent_io_tree_cleanup(&fs_info->pinned_extents);
977 extent_io_tree_cleanup(&fs_info->pending_del);
978 extent_io_tree_cleanup(&fs_info->extent_ins);
979 }
980
981 int btrfs_scan_fs_devices(int fd, const char *path,
982 struct btrfs_fs_devices **fs_devices,
983 u64 sb_bytenr, int run_ioctl)
984 {
985 u64 total_devs;
986 int ret;
987 if (!sb_bytenr)
988 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
989
990 ret = btrfs_scan_one_device(fd, path, fs_devices,
991 &total_devs, sb_bytenr);
992 if (ret) {
993 fprintf(stderr, "No valid Btrfs found on %s\n", path);
994 return ret;
995 }
996
997 if (total_devs != 1) {
998 ret = btrfs_scan_for_fsid(run_ioctl);
999 if (ret)
1000 return ret;
1001 }
1002 return 0;
1003 }
1004
1005 int btrfs_setup_chunk_tree_and_device_map(struct btrfs_fs_info *fs_info)
1006 {
1007 struct btrfs_super_block *sb = fs_info->super_copy;
1008 u32 sectorsize;
1009 u32 nodesize;
1010 u32 leafsize;
1011 u32 blocksize;
1012 u32 stripesize;
1013 u64 generation;
1014 int ret;
1015
1016 nodesize = btrfs_super_nodesize(sb);
1017 leafsize = btrfs_super_leafsize(sb);
1018 sectorsize = btrfs_super_sectorsize(sb);
1019 stripesize = btrfs_super_stripesize(sb);
1020
1021 __setup_root(nodesize, leafsize, sectorsize, stripesize,
1022 fs_info->chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
1023
1024 ret = btrfs_read_sys_array(fs_info->chunk_root);
1025 if (ret)
1026 return ret;
1027
1028 blocksize = btrfs_level_size(fs_info->chunk_root,
1029 btrfs_super_chunk_root_level(sb));
1030 generation = btrfs_super_chunk_root_generation(sb);
1031
1032 fs_info->chunk_root->node = read_tree_block(fs_info->chunk_root,
1033 btrfs_super_chunk_root(sb),
1034 blocksize, generation);
1035 if (!fs_info->chunk_root->node ||
1036 !extent_buffer_uptodate(fs_info->chunk_root->node)) {
1037 fprintf(stderr, "Couldn't read chunk root\n");
1038 return -EIO;
1039 }
1040
1041 if (!(btrfs_super_flags(sb) & BTRFS_SUPER_FLAG_METADUMP)) {
1042 ret = btrfs_read_chunk_tree(fs_info->chunk_root);
1043 if (ret) {
1044 fprintf(stderr, "Couldn't read chunk tree\n");
1045 return ret;
1046 }
1047 }
1048 return 0;
1049 }
1050
1051 static struct btrfs_fs_info *__open_ctree_fd(int fp, const char *path,
1052 u64 sb_bytenr,
1053 u64 root_tree_bytenr,
1054 enum btrfs_open_ctree_flags flags)
1055 {
1056 struct btrfs_fs_info *fs_info;
1057 struct btrfs_super_block *disk_super;
1058 struct btrfs_fs_devices *fs_devices = NULL;
1059 struct extent_buffer *eb;
1060 int ret;
1061 int oflags;
1062
1063 if (sb_bytenr == 0)
1064 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
1065
1066 /* try to drop all the caches */
1067 if (posix_fadvise(fp, 0, 0, POSIX_FADV_DONTNEED))
1068 fprintf(stderr, "Warning, could not drop caches\n");
1069
1070 fs_info = btrfs_new_fs_info(flags & OPEN_CTREE_WRITES, sb_bytenr);
1071 if (!fs_info) {
1072 fprintf(stderr, "Failed to allocate memory for fs_info\n");
1073 return NULL;
1074 }
1075 if (flags & OPEN_CTREE_RESTORE)
1076 fs_info->on_restoring = 1;
1077
1078 ret = btrfs_scan_fs_devices(fp, path, &fs_devices, sb_bytenr,
1079 !(flags & OPEN_CTREE_RECOVER_SUPER));
1080 if (ret)
1081 goto out;
1082
1083 fs_info->fs_devices = fs_devices;
1084 if (flags & OPEN_CTREE_WRITES)
1085 oflags = O_RDWR;
1086 else
1087 oflags = O_RDONLY;
1088
1089 if (flags & OPEN_CTREE_EXCLUSIVE)
1090 oflags |= O_EXCL;
1091
1092 ret = btrfs_open_devices(fs_devices, oflags);
1093 if (ret)
1094 goto out_devices;
1095
1096
1097 disk_super = fs_info->super_copy;
1098 if (!(flags & OPEN_CTREE_RECOVER_SUPER))
1099 ret = btrfs_read_dev_super(fs_devices->latest_bdev,
1100 disk_super, sb_bytenr);
1101 else
1102 ret = btrfs_read_dev_super(fp, disk_super, sb_bytenr);
1103 if (ret) {
1104 printk("No valid btrfs found\n");
1105 goto out_devices;
1106 }
1107
1108 memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
1109
1110 ret = btrfs_check_fs_compatibility(fs_info->super_copy,
1111 flags & OPEN_CTREE_WRITES);
1112 if (ret)
1113 goto out_devices;
1114
1115 ret = btrfs_setup_chunk_tree_and_device_map(fs_info);
1116 if (ret)
1117 goto out_chunk;
1118
1119 eb = fs_info->chunk_root->node;
1120 read_extent_buffer(eb, fs_info->chunk_tree_uuid,
1121 btrfs_header_chunk_tree_uuid(eb),
1122 BTRFS_UUID_SIZE);
1123
1124 ret = btrfs_setup_all_roots(fs_info, root_tree_bytenr, flags);
1125 if (ret)
1126 goto out_failed;
1127
1128 return fs_info;
1129
1130 out_failed:
1131 if (flags & OPEN_CTREE_PARTIAL)
1132 return fs_info;
1133 out_chunk:
1134 btrfs_release_all_roots(fs_info);
1135 btrfs_cleanup_all_caches(fs_info);
1136 out_devices:
1137 btrfs_close_devices(fs_devices);
1138 out:
1139 btrfs_free_fs_info(fs_info);
1140 return NULL;
1141 }
1142
1143 struct btrfs_fs_info *open_ctree_fs_info(const char *filename,
1144 u64 sb_bytenr, u64 root_tree_bytenr,
1145 enum btrfs_open_ctree_flags flags)
1146 {
1147 int fp;
1148 struct btrfs_fs_info *info;
1149 int oflags = O_CREAT | O_RDWR;
1150
1151 if (!(flags & OPEN_CTREE_WRITES))
1152 oflags = O_RDONLY;
1153
1154 fp = open(filename, oflags, 0600);
1155 if (fp < 0) {
1156 fprintf (stderr, "Could not open %s\n", filename);
1157 return NULL;
1158 }
1159 info = __open_ctree_fd(fp, filename, sb_bytenr, root_tree_bytenr,
1160 flags);
1161 close(fp);
1162 return info;
1163 }
1164
1165 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr,
1166 enum btrfs_open_ctree_flags flags)
1167 {
1168 struct btrfs_fs_info *info;
1169
1170 info = open_ctree_fs_info(filename, sb_bytenr, 0, flags);
1171 if (!info)
1172 return NULL;
1173 return info->fs_root;
1174 }
1175
1176 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
1177 enum btrfs_open_ctree_flags flags)
1178 {
1179 struct btrfs_fs_info *info;
1180 info = __open_ctree_fd(fp, path, sb_bytenr, 0, flags);
1181 if (!info)
1182 return NULL;
1183 return info->fs_root;
1184 }
1185
1186 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr)
1187 {
1188 u8 fsid[BTRFS_FSID_SIZE];
1189 int fsid_is_initialized = 0;
1190 struct btrfs_super_block buf;
1191 int i;
1192 int ret;
1193 u64 transid = 0;
1194 u64 bytenr;
1195
1196 if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1197 ret = pread64(fd, &buf, sizeof(buf), sb_bytenr);
1198 if (ret < sizeof(buf))
1199 return -1;
1200
1201 if (btrfs_super_bytenr(&buf) != sb_bytenr ||
1202 btrfs_super_magic(&buf) != BTRFS_MAGIC)
1203 return -1;
1204
1205 memcpy(sb, &buf, sizeof(*sb));
1206 return 0;
1207 }
1208
1209 /*
1210 * we would like to check all the supers, but that would make
1211 * a btrfs mount succeed after a mkfs from a different FS.
1212 * So, we need to add a special mount option to scan for
1213 * later supers, using BTRFS_SUPER_MIRROR_MAX instead
1214 */
1215
1216 for (i = 0; i < 1; i++) {
1217 bytenr = btrfs_sb_offset(i);
1218 ret = pread64(fd, &buf, sizeof(buf), bytenr);
1219 if (ret < sizeof(buf))
1220 break;
1221
1222 if (btrfs_super_bytenr(&buf) != bytenr )
1223 continue;
1224 /* if magic is NULL, the device was removed */
1225 if (btrfs_super_magic(&buf) == 0 && i == 0)
1226 return -1;
1227 if (btrfs_super_magic(&buf) != BTRFS_MAGIC)
1228 continue;
1229
1230 if (!fsid_is_initialized) {
1231 memcpy(fsid, buf.fsid, sizeof(fsid));
1232 fsid_is_initialized = 1;
1233 } else if (memcmp(fsid, buf.fsid, sizeof(fsid))) {
1234 /*
1235 * the superblocks (the original one and
1236 * its backups) contain data of different
1237 * filesystems -> the super cannot be trusted
1238 */
1239 continue;
1240 }
1241
1242 if (btrfs_super_generation(&buf) > transid) {
1243 memcpy(sb, &buf, sizeof(*sb));
1244 transid = btrfs_super_generation(&buf);
1245 }
1246 }
1247
1248 return transid > 0 ? 0 : -1;
1249 }
1250
1251 static int write_dev_supers(struct btrfs_root *root,
1252 struct btrfs_super_block *sb,
1253 struct btrfs_device *device)
1254 {
1255 u64 bytenr;
1256 u32 crc;
1257 int i, ret;
1258
1259 if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
1260 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
1261 crc = ~(u32)0;
1262 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1263 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1264 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1265
1266 /*
1267 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1268 * zero filled, we can use it directly
1269 */
1270 ret = pwrite64(device->fd, root->fs_info->super_copy,
1271 BTRFS_SUPER_INFO_SIZE,
1272 root->fs_info->super_bytenr);
1273 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
1274 return 0;
1275 }
1276
1277 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1278 bytenr = btrfs_sb_offset(i);
1279 if (bytenr + BTRFS_SUPER_INFO_SIZE > device->total_bytes)
1280 break;
1281
1282 btrfs_set_super_bytenr(sb, bytenr);
1283
1284 crc = ~(u32)0;
1285 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
1286 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
1287 btrfs_csum_final(crc, (char *)&sb->csum[0]);
1288
1289 /*
1290 * super_copy is BTRFS_SUPER_INFO_SIZE bytes and is
1291 * zero filled, we can use it directly
1292 */
1293 ret = pwrite64(device->fd, root->fs_info->super_copy,
1294 BTRFS_SUPER_INFO_SIZE, bytenr);
1295 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
1296 }
1297
1298 return 0;
1299 }
1300
1301 int write_all_supers(struct btrfs_root *root)
1302 {
1303 struct list_head *cur;
1304 struct list_head *head = &root->fs_info->fs_devices->devices;
1305 struct btrfs_device *dev;
1306 struct btrfs_super_block *sb;
1307 struct btrfs_dev_item *dev_item;
1308 int ret;
1309 u64 flags;
1310
1311 sb = root->fs_info->super_copy;
1312 dev_item = &sb->dev_item;
1313 list_for_each(cur, head) {
1314 dev = list_entry(cur, struct btrfs_device, dev_list);
1315 if (!dev->writeable)
1316 continue;
1317
1318 btrfs_set_stack_device_generation(dev_item, 0);
1319 btrfs_set_stack_device_type(dev_item, dev->type);
1320 btrfs_set_stack_device_id(dev_item, dev->devid);
1321 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
1322 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
1323 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
1324 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
1325 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
1326 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
1327 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
1328
1329 flags = btrfs_super_flags(sb);
1330 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
1331
1332 ret = write_dev_supers(root, sb, dev);
1333 BUG_ON(ret);
1334 }
1335 return 0;
1336 }
1337
1338 int write_ctree_super(struct btrfs_trans_handle *trans,
1339 struct btrfs_root *root)
1340 {
1341 int ret;
1342 struct btrfs_root *tree_root = root->fs_info->tree_root;
1343 struct btrfs_root *chunk_root = root->fs_info->chunk_root;
1344
1345 if (root->fs_info->readonly)
1346 return 0;
1347
1348 btrfs_set_super_generation(root->fs_info->super_copy,
1349 trans->transid);
1350 btrfs_set_super_root(root->fs_info->super_copy,
1351 tree_root->node->start);
1352 btrfs_set_super_root_level(root->fs_info->super_copy,
1353 btrfs_header_level(tree_root->node));
1354 btrfs_set_super_chunk_root(root->fs_info->super_copy,
1355 chunk_root->node->start);
1356 btrfs_set_super_chunk_root_level(root->fs_info->super_copy,
1357 btrfs_header_level(chunk_root->node));
1358 btrfs_set_super_chunk_root_generation(root->fs_info->super_copy,
1359 btrfs_header_generation(chunk_root->node));
1360
1361 ret = write_all_supers(root);
1362 if (ret)
1363 fprintf(stderr, "failed to write new super block err %d\n", ret);
1364 return ret;
1365 }
1366
1367 int close_ctree(struct btrfs_root *root)
1368 {
1369 int ret;
1370 struct btrfs_trans_handle *trans;
1371 struct btrfs_fs_info *fs_info = root->fs_info;
1372
1373 if (fs_info->last_trans_committed !=
1374 fs_info->generation) {
1375 trans = btrfs_start_transaction(root, 1);
1376 btrfs_commit_transaction(trans, root);
1377 trans = btrfs_start_transaction(root, 1);
1378 ret = commit_tree_roots(trans, fs_info);
1379 BUG_ON(ret);
1380 ret = __commit_transaction(trans, root);
1381 BUG_ON(ret);
1382 write_ctree_super(trans, root);
1383 btrfs_free_transaction(root, trans);
1384 }
1385 btrfs_free_block_groups(fs_info);
1386
1387 free_fs_roots_tree(&fs_info->fs_root_tree);
1388
1389 btrfs_release_all_roots(fs_info);
1390 btrfs_close_devices(fs_info->fs_devices);
1391 btrfs_cleanup_all_caches(fs_info);
1392 btrfs_free_fs_info(fs_info);
1393 return 0;
1394 }
1395
1396 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
1397 struct extent_buffer *eb)
1398 {
1399 return clear_extent_buffer_dirty(eb);
1400 }
1401
1402 int wait_on_tree_block_writeback(struct btrfs_root *root,
1403 struct extent_buffer *eb)
1404 {
1405 return 0;
1406 }
1407
1408 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1409 {
1410 set_extent_buffer_dirty(eb);
1411 }
1412
1413 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1414 {
1415 int ret;
1416
1417 ret = extent_buffer_uptodate(buf);
1418 if (!ret)
1419 return ret;
1420
1421 ret = verify_parent_transid(buf->tree, buf, parent_transid, 1);
1422 return !ret;
1423 }
1424
1425 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1426 {
1427 return set_extent_buffer_uptodate(eb);
1428 }
(deprecated) Btrfs progs developments and patch integration