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Print the root generation in btrfs-debug-tree
[btrfs-progs-unstable/devel.git] / disk-io.c
blobaed624cee9f917a63de75479f2ac3678072e643c
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 return ret;
46
47 fs_devices = root->fs_info->fs_devices;
48 while (fs_devices) {
49 if (!memcmp_extent_buffer(buf, fs_devices->fsid,
50 (unsigned long)btrfs_header_fsid(buf),
51 BTRFS_FSID_SIZE)) {
52 ret = 0;
53 break;
54 }
55 fs_devices = fs_devices->seed;
56 }
57 return ret;
58 }
59
60 u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len)
61 {
62 return crc32c(seed, data, len);
63 }
64
65 void btrfs_csum_final(u32 crc, char *result)
66 {
67 *(__le32 *)result = ~cpu_to_le32(crc);
68 }
69
70 int csum_tree_block_size(struct extent_buffer *buf, u16 csum_size,
71 int verify)
72 {
73 char *result;
74 u32 len;
75 u32 crc = ~(u32)0;
76
77 result = malloc(csum_size * sizeof(char));
78 if (!result)
79 return 1;
80
81 len = buf->len - BTRFS_CSUM_SIZE;
82 crc = crc32c(crc, buf->data + BTRFS_CSUM_SIZE, len);
83 btrfs_csum_final(crc, result);
84
85 if (verify) {
86 if (memcmp_extent_buffer(buf, result, 0, csum_size)) {
87 printk("checksum verify failed on %llu wanted %X "
88 "found %X\n", (unsigned long long)buf->start,
89 *((int *)result), *((char *)buf->data));
90 free(result);
91 return 1;
92 }
93 } else {
94 write_extent_buffer(buf, result, 0, csum_size);
95 }
96 free(result);
97 return 0;
98 }
99
100 int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
101 int verify)
102 {
103 u16 csum_size =
104 btrfs_super_csum_size(&root->fs_info->super_copy);
105 return csum_tree_block_size(buf, csum_size, verify);
106 }
107
108 struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root,
109 u64 bytenr, u32 blocksize)
110 {
111 return find_extent_buffer(&root->fs_info->extent_cache,
112 bytenr, blocksize);
113 }
114
115 struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root,
116 u64 bytenr, u32 blocksize)
117 {
118 return alloc_extent_buffer(&root->fs_info->extent_cache, bytenr,
119 blocksize);
120 }
121
122 int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize,
123 u64 parent_transid)
124 {
125 int ret;
126 struct extent_buffer *eb;
127 u64 length;
128 struct btrfs_multi_bio *multi = NULL;
129 struct btrfs_device *device;
130
131 eb = btrfs_find_tree_block(root, bytenr, blocksize);
132 if (eb && btrfs_buffer_uptodate(eb, parent_transid)) {
133 free_extent_buffer(eb);
134 return 0;
135 }
136
137 length = blocksize;
138 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
139 bytenr, &length, &multi, 0);
140 BUG_ON(ret);
141 device = multi->stripes[0].dev;
142 device->total_ios++;
143 blocksize = min(blocksize, (u32)(64 * 1024));
144 readahead(device->fd, multi->stripes[0].physical, blocksize);
145 kfree(multi);
146 return 0;
147 }
148
149 static int verify_parent_transid(struct extent_io_tree *io_tree,
150 struct extent_buffer *eb, u64 parent_transid)
151 {
152 int ret;
153
154 if (!parent_transid || btrfs_header_generation(eb) == parent_transid)
155 return 0;
156
157 if (extent_buffer_uptodate(eb) &&
158 btrfs_header_generation(eb) == parent_transid) {
159 ret = 0;
160 goto out;
161 }
162 printk("parent transid verify failed on %llu wanted %llu found %llu\n",
163 (unsigned long long)eb->start,
164 (unsigned long long)parent_transid,
165 (unsigned long long)btrfs_header_generation(eb));
166 ret = 1;
167 out:
168 clear_extent_buffer_uptodate(io_tree, eb);
169 return ret;
170
171 }
172
173
174 struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr,
175 u32 blocksize, u64 parent_transid)
176 {
177 int ret;
178 struct extent_buffer *eb;
179 u64 length;
180 struct btrfs_multi_bio *multi = NULL;
181 struct btrfs_device *device;
182 int mirror_num = 0;
183 int num_copies;
184
185 eb = btrfs_find_create_tree_block(root, bytenr, blocksize);
186 if (!eb)
187 return NULL;
188
189 if (btrfs_buffer_uptodate(eb, parent_transid))
190 return eb;
191
192 length = blocksize;
193 while (1) {
194 ret = btrfs_map_block(&root->fs_info->mapping_tree, READ,
195 eb->start, &length, &multi, mirror_num);
196 BUG_ON(ret);
197 device = multi->stripes[0].dev;
198 eb->fd = device->fd;
199 device->total_ios++;
200 eb->dev_bytenr = multi->stripes[0].physical;
201 kfree(multi);
202 ret = read_extent_from_disk(eb);
203
204 if (ret == 0 && check_tree_block(root, eb) == 0 &&
205 csum_tree_block(root, eb, 1) == 0 &&
206 verify_parent_transid(eb->tree, eb, parent_transid) == 0) {
207 btrfs_set_buffer_uptodate(eb);
208 return eb;
209 }
210 num_copies = btrfs_num_copies(&root->fs_info->mapping_tree,
211 eb->start, eb->len);
212 if (num_copies == 1) {
213 break;
214 }
215 mirror_num++;
216 if (mirror_num > num_copies) {
217 break;
218 }
219 }
220 free_extent_buffer(eb);
221 return NULL;
222 }
223
224 int write_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
225 struct extent_buffer *eb)
226 {
227 int ret;
228 int dev_nr;
229 u64 length;
230 struct btrfs_multi_bio *multi = NULL;
231
232 if (check_tree_block(root, eb))
233 BUG();
234 if (!btrfs_buffer_uptodate(eb, trans->transid))
235 BUG();
236
237 btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
238 csum_tree_block(root, eb, 0);
239
240 dev_nr = 0;
241 length = eb->len;
242 ret = btrfs_map_block(&root->fs_info->mapping_tree, WRITE,
243 eb->start, &length, &multi, 0);
244
245 while(dev_nr < multi->num_stripes) {
246 BUG_ON(ret);
247 eb->fd = multi->stripes[dev_nr].dev->fd;
248 eb->dev_bytenr = multi->stripes[dev_nr].physical;
249 multi->stripes[dev_nr].dev->total_ios++;
250 dev_nr++;
251 ret = write_extent_to_disk(eb);
252 BUG_ON(ret);
253 }
254 kfree(multi);
255 return 0;
256 }
257
258 static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
259 u32 stripesize, struct btrfs_root *root,
260 struct btrfs_fs_info *fs_info, u64 objectid)
261 {
262 root->node = NULL;
263 root->commit_root = NULL;
264 root->sectorsize = sectorsize;
265 root->nodesize = nodesize;
266 root->leafsize = leafsize;
267 root->stripesize = stripesize;
268 root->ref_cows = 0;
269 root->track_dirty = 0;
270
271 root->fs_info = fs_info;
272 root->objectid = objectid;
273 root->last_trans = 0;
274 root->highest_inode = 0;
275 root->last_inode_alloc = 0;
276
277 INIT_LIST_HEAD(&root->dirty_list);
278 memset(&root->root_key, 0, sizeof(root->root_key));
279 memset(&root->root_item, 0, sizeof(root->root_item));
280 root->root_key.objectid = objectid;
281 return 0;
282 }
283
284 static int update_cowonly_root(struct btrfs_trans_handle *trans,
285 struct btrfs_root *root)
286 {
287 int ret;
288 u64 old_root_bytenr;
289 struct btrfs_root *tree_root = root->fs_info->tree_root;
290
291 btrfs_write_dirty_block_groups(trans, root);
292 while(1) {
293 old_root_bytenr = btrfs_root_bytenr(&root->root_item);
294 if (old_root_bytenr == root->node->start)
295 break;
296 btrfs_set_root_bytenr(&root->root_item,
297 root->node->start);
298 btrfs_set_root_generation(&root->root_item,
299 trans->transid);
300 root->root_item.level = btrfs_header_level(root->node);
301 ret = btrfs_update_root(trans, tree_root,
302 &root->root_key,
303 &root->root_item);
304 BUG_ON(ret);
305 btrfs_write_dirty_block_groups(trans, root);
306 }
307 return 0;
308 }
309
310 static int commit_tree_roots(struct btrfs_trans_handle *trans,
311 struct btrfs_fs_info *fs_info)
312 {
313 struct btrfs_root *root;
314 struct list_head *next;
315 struct extent_buffer *eb;
316
317 if (fs_info->readonly)
318 return 0;
319
320 eb = fs_info->tree_root->node;
321 extent_buffer_get(eb);
322 btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, 0, &eb);
323 free_extent_buffer(eb);
324
325 while(!list_empty(&fs_info->dirty_cowonly_roots)) {
326 next = fs_info->dirty_cowonly_roots.next;
327 list_del_init(next);
328 root = list_entry(next, struct btrfs_root, dirty_list);
329 update_cowonly_root(trans, root);
330 }
331 return 0;
332 }
333
334 static int __commit_transaction(struct btrfs_trans_handle *trans,
335 struct btrfs_root *root)
336 {
337 u64 start;
338 u64 end;
339 struct extent_buffer *eb;
340 struct extent_io_tree *tree = &root->fs_info->extent_cache;
341 int ret;
342
343 while(1) {
344 ret = find_first_extent_bit(tree, 0, &start, &end,
345 EXTENT_DIRTY);
346 if (ret)
347 break;
348 while(start <= end) {
349 eb = find_first_extent_buffer(tree, start);
350 BUG_ON(!eb || eb->start != start);
351 ret = write_tree_block(trans, root, eb);
352 BUG_ON(ret);
353 start += eb->len;
354 clear_extent_buffer_dirty(eb);
355 free_extent_buffer(eb);
356 }
357 }
358 return 0;
359 }
360
361 int btrfs_commit_transaction(struct btrfs_trans_handle *trans,
362 struct btrfs_root *root)
363 {
364 int ret = 0;
365 struct btrfs_fs_info *fs_info = root->fs_info;
366
367 if (root->commit_root == root->node)
368 goto commit_tree;
369
370 free_extent_buffer(root->commit_root);
371 root->commit_root = NULL;
372
373 btrfs_set_root_bytenr(&root->root_item, root->node->start);
374 btrfs_set_root_generation(&root->root_item, trans->transid);
375 root->root_item.level = btrfs_header_level(root->node);
376 ret = btrfs_update_root(trans, root->fs_info->tree_root,
377 &root->root_key, &root->root_item);
378 BUG_ON(ret);
379 commit_tree:
380 ret = commit_tree_roots(trans, fs_info);
381 BUG_ON(ret);
382 ret = __commit_transaction(trans, root);
383 BUG_ON(ret);
384 write_ctree_super(trans, root);
385 btrfs_finish_extent_commit(trans, fs_info->extent_root,
386 &fs_info->pinned_extents);
387 btrfs_free_transaction(root, trans);
388 free_extent_buffer(root->commit_root);
389 root->commit_root = NULL;
390 fs_info->running_transaction = NULL;
391 return 0;
392 }
393
394 static int find_and_setup_root(struct btrfs_root *tree_root,
395 struct btrfs_fs_info *fs_info,
396 u64 objectid, struct btrfs_root *root)
397 {
398 int ret;
399 u32 blocksize;
400 u64 generation;
401
402 __setup_root(tree_root->nodesize, tree_root->leafsize,
403 tree_root->sectorsize, tree_root->stripesize,
404 root, fs_info, objectid);
405 ret = btrfs_find_last_root(tree_root, objectid,
406 &root->root_item, &root->root_key);
407 BUG_ON(ret);
408
409 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
410 generation = btrfs_root_generation(&root->root_item);
411 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
412 blocksize, generation);
413 BUG_ON(!root->node);
414 return 0;
415 }
416
417 static int find_and_setup_log_root(struct btrfs_root *tree_root,
418 struct btrfs_fs_info *fs_info,
419 struct btrfs_super_block *disk_super)
420 {
421 u32 blocksize;
422 u64 blocknr = btrfs_super_log_root(disk_super);
423 struct btrfs_root *log_root = malloc(sizeof(struct btrfs_root));
424
425 if (blocknr == 0)
426 return 0;
427
428 blocksize = btrfs_level_size(tree_root,
429 btrfs_super_log_root_level(disk_super));
430
431 __setup_root(tree_root->nodesize, tree_root->leafsize,
432 tree_root->sectorsize, tree_root->stripesize,
433 log_root, fs_info, BTRFS_TREE_LOG_OBJECTID);
434
435 log_root->node = read_tree_block(tree_root, blocknr,
436 blocksize,
437 btrfs_super_generation(disk_super) + 1);
438
439 fs_info->log_root_tree = log_root;
440 BUG_ON(!log_root->node);
441 return 0;
442 }
443
444
445 int btrfs_free_fs_root(struct btrfs_fs_info *fs_info,
446 struct btrfs_root *root)
447 {
448 if (root->node)
449 free_extent_buffer(root->node);
450 if (root->commit_root)
451 free_extent_buffer(root->commit_root);
452 kfree(root);
453 return 0;
454 }
455
456 static int free_fs_roots(struct btrfs_fs_info *fs_info)
457 {
458 struct cache_extent *cache;
459 struct btrfs_root *root;
460
461 while (1) {
462 cache = find_first_cache_extent(&fs_info->fs_root_cache, 0);
463 if (!cache)
464 break;
465 root = container_of(cache, struct btrfs_root, cache);
466 remove_cache_extent(&fs_info->fs_root_cache, cache);
467 btrfs_free_fs_root(fs_info, root);
468 }
469 return 0;
470 }
471
472 struct btrfs_root *btrfs_read_fs_root_no_cache(struct btrfs_fs_info *fs_info,
473 struct btrfs_key *location)
474 {
475 struct btrfs_root *root;
476 struct btrfs_root *tree_root = fs_info->tree_root;
477 struct btrfs_path *path;
478 struct extent_buffer *l;
479 u64 generation;
480 u32 blocksize;
481 int ret = 0;
482
483 root = malloc(sizeof(*root));
484 if (!root)
485 return ERR_PTR(-ENOMEM);
486 memset(root, 0, sizeof(*root));
487 if (location->offset == (u64)-1) {
488 ret = find_and_setup_root(tree_root, fs_info,
489 location->objectid, root);
490 if (ret) {
491 free(root);
492 return ERR_PTR(ret);
493 }
494 goto insert;
495 }
496
497 __setup_root(tree_root->nodesize, tree_root->leafsize,
498 tree_root->sectorsize, tree_root->stripesize,
499 root, fs_info, location->objectid);
500
501 path = btrfs_alloc_path();
502 BUG_ON(!path);
503 ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0);
504 if (ret != 0) {
505 if (ret > 0)
506 ret = -ENOENT;
507 goto out;
508 }
509 l = path->nodes[0];
510 read_extent_buffer(l, &root->root_item,
511 btrfs_item_ptr_offset(l, path->slots[0]),
512 sizeof(root->root_item));
513 memcpy(&root->root_key, location, sizeof(*location));
514 ret = 0;
515 out:
516 btrfs_release_path(root, path);
517 btrfs_free_path(path);
518 if (ret) {
519 free(root);
520 return ERR_PTR(ret);
521 }
522 generation = btrfs_root_generation(&root->root_item);
523 blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item));
524 root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item),
525 blocksize, generation);
526 BUG_ON(!root->node);
527 insert:
528 root->ref_cows = 1;
529 return root;
530 }
531
532 struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info,
533 struct btrfs_key *location)
534 {
535 struct btrfs_root *root;
536 struct cache_extent *cache;
537 int ret;
538
539 if (location->objectid == BTRFS_ROOT_TREE_OBJECTID)
540 return fs_info->tree_root;
541 if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID)
542 return fs_info->extent_root;
543 if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID)
544 return fs_info->chunk_root;
545 if (location->objectid == BTRFS_DEV_TREE_OBJECTID)
546 return fs_info->dev_root;
547 if (location->objectid == BTRFS_CSUM_TREE_OBJECTID)
548 return fs_info->csum_root;
549
550 BUG_ON(location->objectid == BTRFS_TREE_RELOC_OBJECTID ||
551 location->offset != (u64)-1);
552
553 cache = find_cache_extent(&fs_info->fs_root_cache,
554 location->objectid, 1);
555 if (cache)
556 return container_of(cache, struct btrfs_root, cache);
557
558 root = btrfs_read_fs_root_no_cache(fs_info, location);
559 if (IS_ERR(root))
560 return root;
561
562 root->cache.start = location->objectid;
563 root->cache.size = 1;
564 ret = insert_existing_cache_extent(&fs_info->fs_root_cache,
565 &root->cache);
566 BUG_ON(ret);
567 return root;
568 }
569
570 struct btrfs_root *open_ctree(const char *filename, u64 sb_bytenr, int writes)
571 {
572 int fp;
573 struct btrfs_root *root;
574 int flags = O_CREAT | O_RDWR;
575
576 if (!writes)
577 flags = O_RDONLY;
578
579 fp = open(filename, flags, 0600);
580 if (fp < 0) {
581 fprintf (stderr, "Could not open %s\n", filename);
582 return NULL;
583 }
584 root = open_ctree_fd(fp, filename, sb_bytenr, writes);
585 close(fp);
586
587 return root;
588 }
589
590 struct btrfs_root *open_ctree_fd(int fp, const char *path, u64 sb_bytenr,
591 int writes)
592 {
593 u32 sectorsize;
594 u32 nodesize;
595 u32 leafsize;
596 u32 blocksize;
597 u32 stripesize;
598 u64 generation;
599 struct btrfs_key key;
600 struct btrfs_root *tree_root = malloc(sizeof(struct btrfs_root));
601 struct btrfs_root *extent_root = malloc(sizeof(struct btrfs_root));
602 struct btrfs_root *chunk_root = malloc(sizeof(struct btrfs_root));
603 struct btrfs_root *dev_root = malloc(sizeof(struct btrfs_root));
604 struct btrfs_root *csum_root = malloc(sizeof(struct btrfs_root));
605 struct btrfs_fs_info *fs_info = malloc(sizeof(*fs_info));
606 int ret;
607 struct btrfs_super_block *disk_super;
608 struct btrfs_fs_devices *fs_devices = NULL;
609 u64 total_devs;
610 u64 features;
611
612 if (sb_bytenr == 0)
613 sb_bytenr = BTRFS_SUPER_INFO_OFFSET;
614
615 ret = btrfs_scan_one_device(fp, path, &fs_devices,
616 &total_devs, sb_bytenr);
617
618 if (ret) {
619 fprintf(stderr, "No valid Btrfs found on %s\n", path);
620 return NULL;
621 }
622
623 if (total_devs != 1) {
624 ret = btrfs_scan_for_fsid(fs_devices, total_devs, 1);
625 BUG_ON(ret);
626 }
627
628 memset(fs_info, 0, sizeof(*fs_info));
629 fs_info->tree_root = tree_root;
630 fs_info->extent_root = extent_root;
631 fs_info->chunk_root = chunk_root;
632 fs_info->dev_root = dev_root;
633 fs_info->csum_root = csum_root;
634
635 if (!writes)
636 fs_info->readonly = 1;
637
638 extent_io_tree_init(&fs_info->extent_cache);
639 extent_io_tree_init(&fs_info->free_space_cache);
640 extent_io_tree_init(&fs_info->block_group_cache);
641 extent_io_tree_init(&fs_info->pinned_extents);
642 extent_io_tree_init(&fs_info->pending_del);
643 extent_io_tree_init(&fs_info->extent_ins);
644 cache_tree_init(&fs_info->fs_root_cache);
645
646 cache_tree_init(&fs_info->mapping_tree.cache_tree);
647
648 mutex_init(&fs_info->fs_mutex);
649 fs_info->fs_devices = fs_devices;
650 INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots);
651 INIT_LIST_HEAD(&fs_info->space_info);
652
653 __setup_root(4096, 4096, 4096, 4096, tree_root,
654 fs_info, BTRFS_ROOT_TREE_OBJECTID);
655
656 if (writes)
657 ret = btrfs_open_devices(fs_devices, O_RDWR);
658 else
659 ret = btrfs_open_devices(fs_devices, O_RDONLY);
660 BUG_ON(ret);
661
662 fs_info->super_bytenr = sb_bytenr;
663 disk_super = &fs_info->super_copy;
664 ret = btrfs_read_dev_super(fs_devices->latest_bdev,
665 disk_super, sb_bytenr);
666 if (ret) {
667 printk("No valid btrfs found\n");
668 BUG_ON(1);
669 }
670
671 memcpy(fs_info->fsid, &disk_super->fsid, BTRFS_FSID_SIZE);
672
673
674 features = btrfs_super_incompat_flags(disk_super) &
675 ~BTRFS_FEATURE_INCOMPAT_SUPP;
676 if (features) {
677 printk("couldn't open because of unsupported "
678 "option features (%Lx).\n",
679 (unsigned long long)features);
680 BUG_ON(1);
681 }
682
683 features = btrfs_super_incompat_flags(disk_super);
684 if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) {
685 features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
686 btrfs_set_super_incompat_flags(disk_super, features);
687 }
688
689 features = btrfs_super_compat_ro_flags(disk_super) &
690 ~BTRFS_FEATURE_COMPAT_RO_SUPP;
691 if (writes && features) {
692 printk("couldn't open RDWR because of unsupported "
693 "option features (%Lx).\n",
694 (unsigned long long)features);
695 BUG_ON(1);
696 }
697
698 nodesize = btrfs_super_nodesize(disk_super);
699 leafsize = btrfs_super_leafsize(disk_super);
700 sectorsize = btrfs_super_sectorsize(disk_super);
701 stripesize = btrfs_super_stripesize(disk_super);
702 tree_root->nodesize = nodesize;
703 tree_root->leafsize = leafsize;
704 tree_root->sectorsize = sectorsize;
705 tree_root->stripesize = stripesize;
706
707 ret = btrfs_read_sys_array(tree_root);
708 BUG_ON(ret);
709 blocksize = btrfs_level_size(tree_root,
710 btrfs_super_chunk_root_level(disk_super));
711 generation = btrfs_super_chunk_root_generation(disk_super);
712
713 __setup_root(nodesize, leafsize, sectorsize, stripesize,
714 chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID);
715
716 chunk_root->node = read_tree_block(chunk_root,
717 btrfs_super_chunk_root(disk_super),
718 blocksize, generation);
719
720 BUG_ON(!chunk_root->node);
721
722 read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
723 (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node),
724 BTRFS_UUID_SIZE);
725
726 if (!(btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_METADUMP)) {
727 ret = btrfs_read_chunk_tree(chunk_root);
728 BUG_ON(ret);
729 }
730
731 blocksize = btrfs_level_size(tree_root,
732 btrfs_super_root_level(disk_super));
733 generation = btrfs_super_generation(disk_super);
734
735 tree_root->node = read_tree_block(tree_root,
736 btrfs_super_root(disk_super),
737 blocksize, generation);
738 BUG_ON(!tree_root->node);
739 ret = find_and_setup_root(tree_root, fs_info,
740 BTRFS_EXTENT_TREE_OBJECTID, extent_root);
741 BUG_ON(ret);
742 extent_root->track_dirty = 1;
743
744 ret = find_and_setup_root(tree_root, fs_info,
745 BTRFS_DEV_TREE_OBJECTID, dev_root);
746 BUG_ON(ret);
747 dev_root->track_dirty = 1;
748
749 ret = find_and_setup_root(tree_root, fs_info,
750 BTRFS_CSUM_TREE_OBJECTID, csum_root);
751 BUG_ON(ret);
752 csum_root->track_dirty = 1;
753
754 BUG_ON(ret);
755
756 find_and_setup_log_root(tree_root, fs_info, disk_super);
757
758 fs_info->generation = generation + 1;
759 btrfs_read_block_groups(fs_info->tree_root);
760
761 key.objectid = BTRFS_FS_TREE_OBJECTID;
762 key.type = BTRFS_ROOT_ITEM_KEY;
763 key.offset = (u64)-1;
764 fs_info->fs_root = btrfs_read_fs_root(fs_info, &key);
765
766 fs_info->data_alloc_profile = (u64)-1;
767 fs_info->metadata_alloc_profile = (u64)-1;
768 fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
769
770 return fs_info->fs_root;
771 }
772
773 int btrfs_read_dev_super(int fd, struct btrfs_super_block *sb, u64 sb_bytenr)
774 {
775 u8 fsid[BTRFS_FSID_SIZE];
776 struct btrfs_super_block buf;
777 int i;
778 int ret;
779 u64 transid = 0;
780 u64 bytenr;
781
782 if (sb_bytenr != BTRFS_SUPER_INFO_OFFSET) {
783 ret = pread64(fd, &buf, sizeof(buf), sb_bytenr);
784 if (ret < sizeof(buf))
785 return -1;
786
787 if (btrfs_super_bytenr(&buf) != sb_bytenr ||
788 strncmp((char *)(&buf.magic), BTRFS_MAGIC,
789 sizeof(buf.magic)))
790 return -1;
791
792 memcpy(sb, &buf, sizeof(*sb));
793 return 0;
794 }
795
796 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
797 bytenr = btrfs_sb_offset(i);
798 ret = pread64(fd, &buf, sizeof(buf), bytenr);
799 if (ret < sizeof(buf))
800 break;
801
802 if (btrfs_super_bytenr(&buf) != bytenr ||
803 strncmp((char *)(&buf.magic), BTRFS_MAGIC,
804 sizeof(buf.magic)))
805 continue;
806
807 if (i == 0)
808 memcpy(fsid, buf.fsid, sizeof(fsid));
809 else if (memcmp(fsid, buf.fsid, sizeof(fsid)))
810 continue;
811
812 if (btrfs_super_generation(&buf) > transid) {
813 memcpy(sb, &buf, sizeof(*sb));
814 transid = btrfs_super_generation(&buf);
815 }
816 }
817
818 return transid > 0 ? 0 : -1;
819 }
820
821 int write_dev_supers(struct btrfs_root *root, struct btrfs_super_block *sb,
822 struct btrfs_device *device)
823 {
824 u64 bytenr;
825 u32 crc;
826 int i, ret;
827
828 if (root->fs_info->super_bytenr != BTRFS_SUPER_INFO_OFFSET) {
829 btrfs_set_super_bytenr(sb, root->fs_info->super_bytenr);
830 printk("speiiiiiiiiiiiiiiiiiiiiiiiiiiiii\n");
831 crc = ~(u32)0;
832 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
833 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
834 btrfs_csum_final(crc, (char *)&sb->csum[0]);
835
836 ret = pwrite64(device->fd, sb, BTRFS_SUPER_INFO_SIZE,
837 root->fs_info->super_bytenr);
838 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
839 return 0;
840 }
841
842 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
843 bytenr = btrfs_sb_offset(i);
844 if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes)
845 break;
846
847 btrfs_set_super_bytenr(sb, bytenr);
848
849 crc = ~(u32)0;
850 crc = btrfs_csum_data(NULL, (char *)sb + BTRFS_CSUM_SIZE, crc,
851 BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE);
852 btrfs_csum_final(crc, (char *)&sb->csum[0]);
853
854 ret = pwrite64(device->fd, sb, BTRFS_SUPER_INFO_SIZE, bytenr);
855 BUG_ON(ret != BTRFS_SUPER_INFO_SIZE);
856 }
857 return 0;
858 }
859
860 int write_all_supers(struct btrfs_root *root)
861 {
862 struct list_head *cur;
863 struct list_head *head = &root->fs_info->fs_devices->devices;
864 struct btrfs_device *dev;
865 struct btrfs_super_block *sb;
866 struct btrfs_dev_item *dev_item;
867 int ret;
868 u64 flags;
869
870 sb = &root->fs_info->super_copy;
871 dev_item = &sb->dev_item;
872 list_for_each(cur, head) {
873 dev = list_entry(cur, struct btrfs_device, dev_list);
874 if (!dev->writeable)
875 continue;
876
877 btrfs_set_stack_device_generation(dev_item, 0);
878 btrfs_set_stack_device_type(dev_item, dev->type);
879 btrfs_set_stack_device_id(dev_item, dev->devid);
880 btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes);
881 btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used);
882 btrfs_set_stack_device_io_align(dev_item, dev->io_align);
883 btrfs_set_stack_device_io_width(dev_item, dev->io_width);
884 btrfs_set_stack_device_sector_size(dev_item, dev->sector_size);
885 memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE);
886 memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE);
887
888 flags = btrfs_super_flags(sb);
889 btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN);
890
891 ret = write_dev_supers(root, sb, dev);
892 BUG_ON(ret);
893 }
894 return 0;
895 }
896
897 int write_ctree_super(struct btrfs_trans_handle *trans,
898 struct btrfs_root *root)
899 {
900 int ret;
901 struct btrfs_root *tree_root = root->fs_info->tree_root;
902 struct btrfs_root *chunk_root = root->fs_info->chunk_root;
903
904 if (root->fs_info->readonly)
905 return 0;
906
907 btrfs_set_super_generation(&root->fs_info->super_copy,
908 trans->transid);
909 btrfs_set_super_root(&root->fs_info->super_copy,
910 tree_root->node->start);
911 btrfs_set_super_root_level(&root->fs_info->super_copy,
912 btrfs_header_level(tree_root->node));
913 btrfs_set_super_chunk_root(&root->fs_info->super_copy,
914 chunk_root->node->start);
915 btrfs_set_super_chunk_root_level(&root->fs_info->super_copy,
916 btrfs_header_level(chunk_root->node));
917 btrfs_set_super_chunk_root_generation(&root->fs_info->super_copy,
918 btrfs_header_generation(chunk_root->node));
919
920 ret = write_all_supers(root);
921 if (ret)
922 fprintf(stderr, "failed to write new super block err %d\n", ret);
923 return ret;
924 }
925
926 static int close_all_devices(struct btrfs_fs_info *fs_info)
927 {
928 struct list_head *list;
929 struct list_head *next;
930 struct btrfs_device *device;
931
932 return 0;
933
934 list = &fs_info->fs_devices->devices;
935 list_for_each(next, list) {
936 device = list_entry(next, struct btrfs_device, dev_list);
937 close(device->fd);
938 }
939 return 0;
940 }
941
942 int close_ctree(struct btrfs_root *root)
943 {
944 int ret;
945 struct btrfs_trans_handle *trans;
946 struct btrfs_fs_info *fs_info = root->fs_info;
947
948 trans = btrfs_start_transaction(root, 1);
949 btrfs_commit_transaction(trans, root);
950 trans = btrfs_start_transaction(root, 1);
951 ret = commit_tree_roots(trans, fs_info);
952 BUG_ON(ret);
953 ret = __commit_transaction(trans, root);
954 BUG_ON(ret);
955 write_ctree_super(trans, root);
956 btrfs_free_transaction(root, trans);
957 btrfs_free_block_groups(fs_info);
958
959 free_fs_roots(fs_info);
960
961 if (fs_info->extent_root->node)
962 free_extent_buffer(fs_info->extent_root->node);
963 if (fs_info->tree_root->node)
964 free_extent_buffer(fs_info->tree_root->node);
965 if (fs_info->chunk_root->node)
966 free_extent_buffer(fs_info->chunk_root->node);
967 if (fs_info->dev_root->node)
968 free_extent_buffer(fs_info->dev_root->node);
969 if (fs_info->csum_root->node)
970 free_extent_buffer(fs_info->csum_root->node);
971
972 if (fs_info->log_root_tree) {
973 if (fs_info->log_root_tree->node)
974 free_extent_buffer(fs_info->log_root_tree->node);
975 free(fs_info->log_root_tree);
976 }
977
978 close_all_devices(fs_info);
979 extent_io_tree_cleanup(&fs_info->extent_cache);
980 extent_io_tree_cleanup(&fs_info->free_space_cache);
981 extent_io_tree_cleanup(&fs_info->block_group_cache);
982 extent_io_tree_cleanup(&fs_info->pinned_extents);
983 extent_io_tree_cleanup(&fs_info->pending_del);
984 extent_io_tree_cleanup(&fs_info->extent_ins);
985
986 free(fs_info->tree_root);
987 free(fs_info->extent_root);
988 free(fs_info->chunk_root);
989 free(fs_info->dev_root);
990 free(fs_info->csum_root);
991 free(fs_info);
992
993 return 0;
994 }
995
996 int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root,
997 struct extent_buffer *eb)
998 {
999 return clear_extent_buffer_dirty(eb);
1000 }
1001
1002 int wait_on_tree_block_writeback(struct btrfs_root *root,
1003 struct extent_buffer *eb)
1004 {
1005 return 0;
1006 }
1007
1008 void btrfs_mark_buffer_dirty(struct extent_buffer *eb)
1009 {
1010 set_extent_buffer_dirty(eb);
1011 }
1012
1013 int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid)
1014 {
1015 int ret;
1016
1017 ret = extent_buffer_uptodate(buf);
1018 if (!ret)
1019 return ret;
1020
1021 ret = verify_parent_transid(buf->tree, buf, parent_transid);
1022 return !ret;
1023 }
1024
1025 int btrfs_set_buffer_uptodate(struct extent_buffer *eb)
1026 {
1027 return set_extent_buffer_uptodate(eb);
1028 }
(deprecated) Btrfs progs developments and patch integration