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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 | #include <linux/fs.h> | |
20 | #include <linux/blkdev.h> | |
21 | #include <linux/scatterlist.h> | |
22 | #include <linux/swap.h> | |
23 | #include <linux/radix-tree.h> | |
24 | #include <linux/writeback.h> | |
25 | #include <linux/buffer_head.h> | |
26 | #include <linux/workqueue.h> | |
27 | #include <linux/kthread.h> | |
28 | #include <linux/slab.h> | |
29 | #include <linux/migrate.h> | |
30 | #include <linux/ratelimit.h> | |
31 | #include <linux/uuid.h> | |
32 | #include <linux/semaphore.h> | |
33 | #include <asm/unaligned.h> | |
34 | #include "ctree.h" | |
35 | #include "disk-io.h" | |
36 | #include "hash.h" | |
37 | #include "transaction.h" | |
38 | #include "btrfs_inode.h" | |
39 | #include "volumes.h" | |
40 | #include "print-tree.h" | |
41 | #include "locking.h" | |
42 | #include "tree-log.h" | |
43 | #include "free-space-cache.h" | |
44 | #include "free-space-tree.h" | |
45 | #include "inode-map.h" | |
46 | #include "check-integrity.h" | |
47 | #include "rcu-string.h" | |
48 | #include "dev-replace.h" | |
49 | #include "raid56.h" | |
50 | #include "sysfs.h" | |
51 | #include "qgroup.h" | |
52 | #include "compression.h" | |
53 | ||
54 | #ifdef CONFIG_X86 | |
55 | #include <asm/cpufeature.h> | |
56 | #endif | |
57 | ||
58 | #define BTRFS_SUPER_FLAG_SUPP (BTRFS_HEADER_FLAG_WRITTEN |\ | |
59 | BTRFS_HEADER_FLAG_RELOC |\ | |
60 | BTRFS_SUPER_FLAG_ERROR |\ | |
61 | BTRFS_SUPER_FLAG_SEEDING |\ | |
62 | BTRFS_SUPER_FLAG_METADUMP) | |
63 | ||
64 | static const struct extent_io_ops btree_extent_io_ops; | |
65 | static void end_workqueue_fn(struct btrfs_work *work); | |
66 | static void free_fs_root(struct btrfs_root *root); | |
67 | static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info, | |
68 | int read_only); | |
69 | static void btrfs_destroy_ordered_extents(struct btrfs_root *root); | |
70 | static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, | |
71 | struct btrfs_root *root); | |
72 | static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root); | |
73 | static int btrfs_destroy_marked_extents(struct btrfs_root *root, | |
74 | struct extent_io_tree *dirty_pages, | |
75 | int mark); | |
76 | static int btrfs_destroy_pinned_extent(struct btrfs_root *root, | |
77 | struct extent_io_tree *pinned_extents); | |
78 | static int btrfs_cleanup_transaction(struct btrfs_root *root); | |
79 | static void btrfs_error_commit_super(struct btrfs_root *root); | |
80 | ||
81 | /* | |
82 | * btrfs_end_io_wq structs are used to do processing in task context when an IO | |
83 | * is complete. This is used during reads to verify checksums, and it is used | |
84 | * by writes to insert metadata for new file extents after IO is complete. | |
85 | */ | |
86 | struct btrfs_end_io_wq { | |
87 | struct bio *bio; | |
88 | bio_end_io_t *end_io; | |
89 | void *private; | |
90 | struct btrfs_fs_info *info; | |
91 | int error; | |
92 | enum btrfs_wq_endio_type metadata; | |
93 | struct list_head list; | |
94 | struct btrfs_work work; | |
95 | }; | |
96 | ||
97 | static struct kmem_cache *btrfs_end_io_wq_cache; | |
98 | ||
99 | int __init btrfs_end_io_wq_init(void) | |
100 | { | |
101 | btrfs_end_io_wq_cache = kmem_cache_create("btrfs_end_io_wq", | |
102 | sizeof(struct btrfs_end_io_wq), | |
103 | 0, | |
104 | SLAB_MEM_SPREAD, | |
105 | NULL); | |
106 | if (!btrfs_end_io_wq_cache) | |
107 | return -ENOMEM; | |
108 | return 0; | |
109 | } | |
110 | ||
111 | void btrfs_end_io_wq_exit(void) | |
112 | { | |
113 | kmem_cache_destroy(btrfs_end_io_wq_cache); | |
114 | } | |
115 | ||
116 | /* | |
117 | * async submit bios are used to offload expensive checksumming | |
118 | * onto the worker threads. They checksum file and metadata bios | |
119 | * just before they are sent down the IO stack. | |
120 | */ | |
121 | struct async_submit_bio { | |
122 | struct inode *inode; | |
123 | struct bio *bio; | |
124 | struct list_head list; | |
125 | extent_submit_bio_hook_t *submit_bio_start; | |
126 | extent_submit_bio_hook_t *submit_bio_done; | |
127 | int mirror_num; | |
128 | unsigned long bio_flags; | |
129 | /* | |
130 | * bio_offset is optional, can be used if the pages in the bio | |
131 | * can't tell us where in the file the bio should go | |
132 | */ | |
133 | u64 bio_offset; | |
134 | struct btrfs_work work; | |
135 | int error; | |
136 | }; | |
137 | ||
138 | /* | |
139 | * Lockdep class keys for extent_buffer->lock's in this root. For a given | |
140 | * eb, the lockdep key is determined by the btrfs_root it belongs to and | |
141 | * the level the eb occupies in the tree. | |
142 | * | |
143 | * Different roots are used for different purposes and may nest inside each | |
144 | * other and they require separate keysets. As lockdep keys should be | |
145 | * static, assign keysets according to the purpose of the root as indicated | |
146 | * by btrfs_root->objectid. This ensures that all special purpose roots | |
147 | * have separate keysets. | |
148 | * | |
149 | * Lock-nesting across peer nodes is always done with the immediate parent | |
150 | * node locked thus preventing deadlock. As lockdep doesn't know this, use | |
151 | * subclass to avoid triggering lockdep warning in such cases. | |
152 | * | |
153 | * The key is set by the readpage_end_io_hook after the buffer has passed | |
154 | * csum validation but before the pages are unlocked. It is also set by | |
155 | * btrfs_init_new_buffer on freshly allocated blocks. | |
156 | * | |
157 | * We also add a check to make sure the highest level of the tree is the | |
158 | * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code | |
159 | * needs update as well. | |
160 | */ | |
161 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
162 | # if BTRFS_MAX_LEVEL != 8 | |
163 | # error | |
164 | # endif | |
165 | ||
166 | static struct btrfs_lockdep_keyset { | |
167 | u64 id; /* root objectid */ | |
168 | const char *name_stem; /* lock name stem */ | |
169 | char names[BTRFS_MAX_LEVEL + 1][20]; | |
170 | struct lock_class_key keys[BTRFS_MAX_LEVEL + 1]; | |
171 | } btrfs_lockdep_keysets[] = { | |
172 | { .id = BTRFS_ROOT_TREE_OBJECTID, .name_stem = "root" }, | |
173 | { .id = BTRFS_EXTENT_TREE_OBJECTID, .name_stem = "extent" }, | |
174 | { .id = BTRFS_CHUNK_TREE_OBJECTID, .name_stem = "chunk" }, | |
175 | { .id = BTRFS_DEV_TREE_OBJECTID, .name_stem = "dev" }, | |
176 | { .id = BTRFS_FS_TREE_OBJECTID, .name_stem = "fs" }, | |
177 | { .id = BTRFS_CSUM_TREE_OBJECTID, .name_stem = "csum" }, | |
178 | { .id = BTRFS_QUOTA_TREE_OBJECTID, .name_stem = "quota" }, | |
179 | { .id = BTRFS_TREE_LOG_OBJECTID, .name_stem = "log" }, | |
180 | { .id = BTRFS_TREE_RELOC_OBJECTID, .name_stem = "treloc" }, | |
181 | { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, .name_stem = "dreloc" }, | |
182 | { .id = BTRFS_UUID_TREE_OBJECTID, .name_stem = "uuid" }, | |
183 | { .id = BTRFS_FREE_SPACE_TREE_OBJECTID, .name_stem = "free-space" }, | |
184 | { .id = 0, .name_stem = "tree" }, | |
185 | }; | |
186 | ||
187 | void __init btrfs_init_lockdep(void) | |
188 | { | |
189 | int i, j; | |
190 | ||
191 | /* initialize lockdep class names */ | |
192 | for (i = 0; i < ARRAY_SIZE(btrfs_lockdep_keysets); i++) { | |
193 | struct btrfs_lockdep_keyset *ks = &btrfs_lockdep_keysets[i]; | |
194 | ||
195 | for (j = 0; j < ARRAY_SIZE(ks->names); j++) | |
196 | snprintf(ks->names[j], sizeof(ks->names[j]), | |
197 | "btrfs-%s-%02d", ks->name_stem, j); | |
198 | } | |
199 | } | |
200 | ||
201 | void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb, | |
202 | int level) | |
203 | { | |
204 | struct btrfs_lockdep_keyset *ks; | |
205 | ||
206 | BUG_ON(level >= ARRAY_SIZE(ks->keys)); | |
207 | ||
208 | /* find the matching keyset, id 0 is the default entry */ | |
209 | for (ks = btrfs_lockdep_keysets; ks->id; ks++) | |
210 | if (ks->id == objectid) | |
211 | break; | |
212 | ||
213 | lockdep_set_class_and_name(&eb->lock, | |
214 | &ks->keys[level], ks->names[level]); | |
215 | } | |
216 | ||
217 | #endif | |
218 | ||
219 | /* | |
220 | * extents on the btree inode are pretty simple, there's one extent | |
221 | * that covers the entire device | |
222 | */ | |
223 | static struct extent_map *btree_get_extent(struct inode *inode, | |
224 | struct page *page, size_t pg_offset, u64 start, u64 len, | |
225 | int create) | |
226 | { | |
227 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; | |
228 | struct extent_map *em; | |
229 | int ret; | |
230 | ||
231 | read_lock(&em_tree->lock); | |
232 | em = lookup_extent_mapping(em_tree, start, len); | |
233 | if (em) { | |
234 | em->bdev = | |
235 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; | |
236 | read_unlock(&em_tree->lock); | |
237 | goto out; | |
238 | } | |
239 | read_unlock(&em_tree->lock); | |
240 | ||
241 | em = alloc_extent_map(); | |
242 | if (!em) { | |
243 | em = ERR_PTR(-ENOMEM); | |
244 | goto out; | |
245 | } | |
246 | em->start = 0; | |
247 | em->len = (u64)-1; | |
248 | em->block_len = (u64)-1; | |
249 | em->block_start = 0; | |
250 | em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; | |
251 | ||
252 | write_lock(&em_tree->lock); | |
253 | ret = add_extent_mapping(em_tree, em, 0); | |
254 | if (ret == -EEXIST) { | |
255 | free_extent_map(em); | |
256 | em = lookup_extent_mapping(em_tree, start, len); | |
257 | if (!em) | |
258 | em = ERR_PTR(-EIO); | |
259 | } else if (ret) { | |
260 | free_extent_map(em); | |
261 | em = ERR_PTR(ret); | |
262 | } | |
263 | write_unlock(&em_tree->lock); | |
264 | ||
265 | out: | |
266 | return em; | |
267 | } | |
268 | ||
269 | u32 btrfs_csum_data(char *data, u32 seed, size_t len) | |
270 | { | |
271 | return btrfs_crc32c(seed, data, len); | |
272 | } | |
273 | ||
274 | void btrfs_csum_final(u32 crc, u8 *result) | |
275 | { | |
276 | put_unaligned_le32(~crc, result); | |
277 | } | |
278 | ||
279 | /* | |
280 | * compute the csum for a btree block, and either verify it or write it | |
281 | * into the csum field of the block. | |
282 | */ | |
283 | static int csum_tree_block(struct btrfs_fs_info *fs_info, | |
284 | struct extent_buffer *buf, | |
285 | int verify) | |
286 | { | |
287 | u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); | |
288 | char *result = NULL; | |
289 | unsigned long len; | |
290 | unsigned long cur_len; | |
291 | unsigned long offset = BTRFS_CSUM_SIZE; | |
292 | char *kaddr; | |
293 | unsigned long map_start; | |
294 | unsigned long map_len; | |
295 | int err; | |
296 | u32 crc = ~(u32)0; | |
297 | unsigned long inline_result; | |
298 | ||
299 | len = buf->len - offset; | |
300 | while (len > 0) { | |
301 | err = map_private_extent_buffer(buf, offset, 32, | |
302 | &kaddr, &map_start, &map_len); | |
303 | if (err) | |
304 | return err; | |
305 | cur_len = min(len, map_len - (offset - map_start)); | |
306 | crc = btrfs_csum_data(kaddr + offset - map_start, | |
307 | crc, cur_len); | |
308 | len -= cur_len; | |
309 | offset += cur_len; | |
310 | } | |
311 | if (csum_size > sizeof(inline_result)) { | |
312 | result = kzalloc(csum_size, GFP_NOFS); | |
313 | if (!result) | |
314 | return -ENOMEM; | |
315 | } else { | |
316 | result = (char *)&inline_result; | |
317 | } | |
318 | ||
319 | btrfs_csum_final(crc, result); | |
320 | ||
321 | if (verify) { | |
322 | if (memcmp_extent_buffer(buf, result, 0, csum_size)) { | |
323 | u32 val; | |
324 | u32 found = 0; | |
325 | memcpy(&found, result, csum_size); | |
326 | ||
327 | read_extent_buffer(buf, &val, 0, csum_size); | |
328 | btrfs_warn_rl(fs_info, | |
329 | "%s checksum verify failed on %llu wanted %X found %X level %d", | |
330 | fs_info->sb->s_id, buf->start, | |
331 | val, found, btrfs_header_level(buf)); | |
332 | if (result != (char *)&inline_result) | |
333 | kfree(result); | |
334 | return -EUCLEAN; | |
335 | } | |
336 | } else { | |
337 | write_extent_buffer(buf, result, 0, csum_size); | |
338 | } | |
339 | if (result != (char *)&inline_result) | |
340 | kfree(result); | |
341 | return 0; | |
342 | } | |
343 | ||
344 | /* | |
345 | * we can't consider a given block up to date unless the transid of the | |
346 | * block matches the transid in the parent node's pointer. This is how we | |
347 | * detect blocks that either didn't get written at all or got written | |
348 | * in the wrong place. | |
349 | */ | |
350 | static int verify_parent_transid(struct extent_io_tree *io_tree, | |
351 | struct extent_buffer *eb, u64 parent_transid, | |
352 | int atomic) | |
353 | { | |
354 | struct extent_state *cached_state = NULL; | |
355 | int ret; | |
356 | bool need_lock = (current->journal_info == BTRFS_SEND_TRANS_STUB); | |
357 | ||
358 | if (!parent_transid || btrfs_header_generation(eb) == parent_transid) | |
359 | return 0; | |
360 | ||
361 | if (atomic) | |
362 | return -EAGAIN; | |
363 | ||
364 | if (need_lock) { | |
365 | btrfs_tree_read_lock(eb); | |
366 | btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK); | |
367 | } | |
368 | ||
369 | lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1, | |
370 | &cached_state); | |
371 | if (extent_buffer_uptodate(eb) && | |
372 | btrfs_header_generation(eb) == parent_transid) { | |
373 | ret = 0; | |
374 | goto out; | |
375 | } | |
376 | btrfs_err_rl(eb->fs_info, | |
377 | "parent transid verify failed on %llu wanted %llu found %llu", | |
378 | eb->start, | |
379 | parent_transid, btrfs_header_generation(eb)); | |
380 | ret = 1; | |
381 | ||
382 | /* | |
383 | * Things reading via commit roots that don't have normal protection, | |
384 | * like send, can have a really old block in cache that may point at a | |
385 | * block that has been freed and re-allocated. So don't clear uptodate | |
386 | * if we find an eb that is under IO (dirty/writeback) because we could | |
387 | * end up reading in the stale data and then writing it back out and | |
388 | * making everybody very sad. | |
389 | */ | |
390 | if (!extent_buffer_under_io(eb)) | |
391 | clear_extent_buffer_uptodate(eb); | |
392 | out: | |
393 | unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1, | |
394 | &cached_state, GFP_NOFS); | |
395 | if (need_lock) | |
396 | btrfs_tree_read_unlock_blocking(eb); | |
397 | return ret; | |
398 | } | |
399 | ||
400 | /* | |
401 | * Return 0 if the superblock checksum type matches the checksum value of that | |
402 | * algorithm. Pass the raw disk superblock data. | |
403 | */ | |
404 | static int btrfs_check_super_csum(struct btrfs_fs_info *fs_info, | |
405 | char *raw_disk_sb) | |
406 | { | |
407 | struct btrfs_super_block *disk_sb = | |
408 | (struct btrfs_super_block *)raw_disk_sb; | |
409 | u16 csum_type = btrfs_super_csum_type(disk_sb); | |
410 | int ret = 0; | |
411 | ||
412 | if (csum_type == BTRFS_CSUM_TYPE_CRC32) { | |
413 | u32 crc = ~(u32)0; | |
414 | const int csum_size = sizeof(crc); | |
415 | char result[csum_size]; | |
416 | ||
417 | /* | |
418 | * The super_block structure does not span the whole | |
419 | * BTRFS_SUPER_INFO_SIZE range, we expect that the unused space | |
420 | * is filled with zeros and is included in the checksum. | |
421 | */ | |
422 | crc = btrfs_csum_data(raw_disk_sb + BTRFS_CSUM_SIZE, | |
423 | crc, BTRFS_SUPER_INFO_SIZE - BTRFS_CSUM_SIZE); | |
424 | btrfs_csum_final(crc, result); | |
425 | ||
426 | if (memcmp(raw_disk_sb, result, csum_size)) | |
427 | ret = 1; | |
428 | } | |
429 | ||
430 | if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) { | |
431 | btrfs_err(fs_info, "unsupported checksum algorithm %u", | |
432 | csum_type); | |
433 | ret = 1; | |
434 | } | |
435 | ||
436 | return ret; | |
437 | } | |
438 | ||
439 | /* | |
440 | * helper to read a given tree block, doing retries as required when | |
441 | * the checksums don't match and we have alternate mirrors to try. | |
442 | */ | |
443 | static int btree_read_extent_buffer_pages(struct btrfs_root *root, | |
444 | struct extent_buffer *eb, | |
445 | u64 parent_transid) | |
446 | { | |
447 | struct extent_io_tree *io_tree; | |
448 | int failed = 0; | |
449 | int ret; | |
450 | int num_copies = 0; | |
451 | int mirror_num = 0; | |
452 | int failed_mirror = 0; | |
453 | ||
454 | clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); | |
455 | io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; | |
456 | while (1) { | |
457 | ret = read_extent_buffer_pages(io_tree, eb, WAIT_COMPLETE, | |
458 | btree_get_extent, mirror_num); | |
459 | if (!ret) { | |
460 | if (!verify_parent_transid(io_tree, eb, | |
461 | parent_transid, 0)) | |
462 | break; | |
463 | else | |
464 | ret = -EIO; | |
465 | } | |
466 | ||
467 | /* | |
468 | * This buffer's crc is fine, but its contents are corrupted, so | |
469 | * there is no reason to read the other copies, they won't be | |
470 | * any less wrong. | |
471 | */ | |
472 | if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags)) | |
473 | break; | |
474 | ||
475 | num_copies = btrfs_num_copies(root->fs_info, | |
476 | eb->start, eb->len); | |
477 | if (num_copies == 1) | |
478 | break; | |
479 | ||
480 | if (!failed_mirror) { | |
481 | failed = 1; | |
482 | failed_mirror = eb->read_mirror; | |
483 | } | |
484 | ||
485 | mirror_num++; | |
486 | if (mirror_num == failed_mirror) | |
487 | mirror_num++; | |
488 | ||
489 | if (mirror_num > num_copies) | |
490 | break; | |
491 | } | |
492 | ||
493 | if (failed && !ret && failed_mirror) | |
494 | repair_eb_io_failure(root, eb, failed_mirror); | |
495 | ||
496 | return ret; | |
497 | } | |
498 | ||
499 | /* | |
500 | * checksum a dirty tree block before IO. This has extra checks to make sure | |
501 | * we only fill in the checksum field in the first page of a multi-page block | |
502 | */ | |
503 | ||
504 | static int csum_dirty_buffer(struct btrfs_fs_info *fs_info, struct page *page) | |
505 | { | |
506 | u64 start = page_offset(page); | |
507 | u64 found_start; | |
508 | struct extent_buffer *eb; | |
509 | ||
510 | eb = (struct extent_buffer *)page->private; | |
511 | if (page != eb->pages[0]) | |
512 | return 0; | |
513 | ||
514 | found_start = btrfs_header_bytenr(eb); | |
515 | /* | |
516 | * Please do not consolidate these warnings into a single if. | |
517 | * It is useful to know what went wrong. | |
518 | */ | |
519 | if (WARN_ON(found_start != start)) | |
520 | return -EUCLEAN; | |
521 | if (WARN_ON(!PageUptodate(page))) | |
522 | return -EUCLEAN; | |
523 | ||
524 | ASSERT(memcmp_extent_buffer(eb, fs_info->fsid, | |
525 | btrfs_header_fsid(), BTRFS_FSID_SIZE) == 0); | |
526 | ||
527 | return csum_tree_block(fs_info, eb, 0); | |
528 | } | |
529 | ||
530 | static int check_tree_block_fsid(struct btrfs_fs_info *fs_info, | |
531 | struct extent_buffer *eb) | |
532 | { | |
533 | struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; | |
534 | u8 fsid[BTRFS_UUID_SIZE]; | |
535 | int ret = 1; | |
536 | ||
537 | read_extent_buffer(eb, fsid, btrfs_header_fsid(), BTRFS_FSID_SIZE); | |
538 | while (fs_devices) { | |
539 | if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) { | |
540 | ret = 0; | |
541 | break; | |
542 | } | |
543 | fs_devices = fs_devices->seed; | |
544 | } | |
545 | return ret; | |
546 | } | |
547 | ||
548 | #define CORRUPT(reason, eb, root, slot) \ | |
549 | btrfs_crit(root->fs_info, "corrupt %s, %s: block=%llu," \ | |
550 | " root=%llu, slot=%d", \ | |
551 | btrfs_header_level(eb) == 0 ? "leaf" : "node",\ | |
552 | reason, btrfs_header_bytenr(eb), root->objectid, slot) | |
553 | ||
554 | static noinline int check_leaf(struct btrfs_root *root, | |
555 | struct extent_buffer *leaf) | |
556 | { | |
557 | struct btrfs_key key; | |
558 | struct btrfs_key leaf_key; | |
559 | u32 nritems = btrfs_header_nritems(leaf); | |
560 | int slot; | |
561 | ||
562 | if (nritems == 0) { | |
563 | struct btrfs_root *check_root; | |
564 | ||
565 | key.objectid = btrfs_header_owner(leaf); | |
566 | key.type = BTRFS_ROOT_ITEM_KEY; | |
567 | key.offset = (u64)-1; | |
568 | ||
569 | check_root = btrfs_get_fs_root(root->fs_info, &key, false); | |
570 | /* | |
571 | * The only reason we also check NULL here is that during | |
572 | * open_ctree() some roots has not yet been set up. | |
573 | */ | |
574 | if (!IS_ERR_OR_NULL(check_root)) { | |
575 | /* if leaf is the root, then it's fine */ | |
576 | if (leaf->start != | |
577 | btrfs_root_bytenr(&check_root->root_item)) { | |
578 | CORRUPT("non-root leaf's nritems is 0", | |
579 | leaf, root, 0); | |
580 | return -EIO; | |
581 | } | |
582 | } | |
583 | return 0; | |
584 | } | |
585 | ||
586 | /* Check the 0 item */ | |
587 | if (btrfs_item_offset_nr(leaf, 0) + btrfs_item_size_nr(leaf, 0) != | |
588 | BTRFS_LEAF_DATA_SIZE(root->fs_info)) { | |
589 | CORRUPT("invalid item offset size pair", leaf, root, 0); | |
590 | return -EIO; | |
591 | } | |
592 | ||
593 | /* | |
594 | * Check to make sure each items keys are in the correct order and their | |
595 | * offsets make sense. We only have to loop through nritems-1 because | |
596 | * we check the current slot against the next slot, which verifies the | |
597 | * next slot's offset+size makes sense and that the current's slot | |
598 | * offset is correct. | |
599 | */ | |
600 | for (slot = 0; slot < nritems - 1; slot++) { | |
601 | btrfs_item_key_to_cpu(leaf, &leaf_key, slot); | |
602 | btrfs_item_key_to_cpu(leaf, &key, slot + 1); | |
603 | ||
604 | /* Make sure the keys are in the right order */ | |
605 | if (btrfs_comp_cpu_keys(&leaf_key, &key) >= 0) { | |
606 | CORRUPT("bad key order", leaf, root, slot); | |
607 | return -EIO; | |
608 | } | |
609 | ||
610 | /* | |
611 | * Make sure the offset and ends are right, remember that the | |
612 | * item data starts at the end of the leaf and grows towards the | |
613 | * front. | |
614 | */ | |
615 | if (btrfs_item_offset_nr(leaf, slot) != | |
616 | btrfs_item_end_nr(leaf, slot + 1)) { | |
617 | CORRUPT("slot offset bad", leaf, root, slot); | |
618 | return -EIO; | |
619 | } | |
620 | ||
621 | /* | |
622 | * Check to make sure that we don't point outside of the leaf, | |
623 | * just in case all the items are consistent to each other, but | |
624 | * all point outside of the leaf. | |
625 | */ | |
626 | if (btrfs_item_end_nr(leaf, slot) > | |
627 | BTRFS_LEAF_DATA_SIZE(root->fs_info)) { | |
628 | CORRUPT("slot end outside of leaf", leaf, root, slot); | |
629 | return -EIO; | |
630 | } | |
631 | } | |
632 | ||
633 | return 0; | |
634 | } | |
635 | ||
636 | static int check_node(struct btrfs_root *root, struct extent_buffer *node) | |
637 | { | |
638 | unsigned long nr = btrfs_header_nritems(node); | |
639 | struct btrfs_key key, next_key; | |
640 | int slot; | |
641 | u64 bytenr; | |
642 | int ret = 0; | |
643 | ||
644 | if (nr == 0 || nr > BTRFS_NODEPTRS_PER_BLOCK(root->fs_info)) { | |
645 | btrfs_crit(root->fs_info, | |
646 | "corrupt node: block %llu root %llu nritems %lu", | |
647 | node->start, root->objectid, nr); | |
648 | return -EIO; | |
649 | } | |
650 | ||
651 | for (slot = 0; slot < nr - 1; slot++) { | |
652 | bytenr = btrfs_node_blockptr(node, slot); | |
653 | btrfs_node_key_to_cpu(node, &key, slot); | |
654 | btrfs_node_key_to_cpu(node, &next_key, slot + 1); | |
655 | ||
656 | if (!bytenr) { | |
657 | CORRUPT("invalid item slot", node, root, slot); | |
658 | ret = -EIO; | |
659 | goto out; | |
660 | } | |
661 | ||
662 | if (btrfs_comp_cpu_keys(&key, &next_key) >= 0) { | |
663 | CORRUPT("bad key order", node, root, slot); | |
664 | ret = -EIO; | |
665 | goto out; | |
666 | } | |
667 | } | |
668 | out: | |
669 | return ret; | |
670 | } | |
671 | ||
672 | static int btree_readpage_end_io_hook(struct btrfs_io_bio *io_bio, | |
673 | u64 phy_offset, struct page *page, | |
674 | u64 start, u64 end, int mirror) | |
675 | { | |
676 | u64 found_start; | |
677 | int found_level; | |
678 | struct extent_buffer *eb; | |
679 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
680 | struct btrfs_fs_info *fs_info = root->fs_info; | |
681 | int ret = 0; | |
682 | int reads_done; | |
683 | ||
684 | if (!page->private) | |
685 | goto out; | |
686 | ||
687 | eb = (struct extent_buffer *)page->private; | |
688 | ||
689 | /* the pending IO might have been the only thing that kept this buffer | |
690 | * in memory. Make sure we have a ref for all this other checks | |
691 | */ | |
692 | extent_buffer_get(eb); | |
693 | ||
694 | reads_done = atomic_dec_and_test(&eb->io_pages); | |
695 | if (!reads_done) | |
696 | goto err; | |
697 | ||
698 | eb->read_mirror = mirror; | |
699 | if (test_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags)) { | |
700 | ret = -EIO; | |
701 | goto err; | |
702 | } | |
703 | ||
704 | found_start = btrfs_header_bytenr(eb); | |
705 | if (found_start != eb->start) { | |
706 | btrfs_err_rl(fs_info, "bad tree block start %llu %llu", | |
707 | found_start, eb->start); | |
708 | ret = -EIO; | |
709 | goto err; | |
710 | } | |
711 | if (check_tree_block_fsid(fs_info, eb)) { | |
712 | btrfs_err_rl(fs_info, "bad fsid on block %llu", | |
713 | eb->start); | |
714 | ret = -EIO; | |
715 | goto err; | |
716 | } | |
717 | found_level = btrfs_header_level(eb); | |
718 | if (found_level >= BTRFS_MAX_LEVEL) { | |
719 | btrfs_err(fs_info, "bad tree block level %d", | |
720 | (int)btrfs_header_level(eb)); | |
721 | ret = -EIO; | |
722 | goto err; | |
723 | } | |
724 | ||
725 | btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb), | |
726 | eb, found_level); | |
727 | ||
728 | ret = csum_tree_block(fs_info, eb, 1); | |
729 | if (ret) | |
730 | goto err; | |
731 | ||
732 | /* | |
733 | * If this is a leaf block and it is corrupt, set the corrupt bit so | |
734 | * that we don't try and read the other copies of this block, just | |
735 | * return -EIO. | |
736 | */ | |
737 | if (found_level == 0 && check_leaf(root, eb)) { | |
738 | set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); | |
739 | ret = -EIO; | |
740 | } | |
741 | ||
742 | if (found_level > 0 && check_node(root, eb)) | |
743 | ret = -EIO; | |
744 | ||
745 | if (!ret) | |
746 | set_extent_buffer_uptodate(eb); | |
747 | err: | |
748 | if (reads_done && | |
749 | test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags)) | |
750 | btree_readahead_hook(fs_info, eb, ret); | |
751 | ||
752 | if (ret) { | |
753 | /* | |
754 | * our io error hook is going to dec the io pages | |
755 | * again, we have to make sure it has something | |
756 | * to decrement | |
757 | */ | |
758 | atomic_inc(&eb->io_pages); | |
759 | clear_extent_buffer_uptodate(eb); | |
760 | } | |
761 | free_extent_buffer(eb); | |
762 | out: | |
763 | return ret; | |
764 | } | |
765 | ||
766 | static int btree_io_failed_hook(struct page *page, int failed_mirror) | |
767 | { | |
768 | struct extent_buffer *eb; | |
769 | ||
770 | eb = (struct extent_buffer *)page->private; | |
771 | set_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags); | |
772 | eb->read_mirror = failed_mirror; | |
773 | atomic_dec(&eb->io_pages); | |
774 | if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags)) | |
775 | btree_readahead_hook(eb->fs_info, eb, -EIO); | |
776 | return -EIO; /* we fixed nothing */ | |
777 | } | |
778 | ||
779 | static void end_workqueue_bio(struct bio *bio) | |
780 | { | |
781 | struct btrfs_end_io_wq *end_io_wq = bio->bi_private; | |
782 | struct btrfs_fs_info *fs_info; | |
783 | struct btrfs_workqueue *wq; | |
784 | btrfs_work_func_t func; | |
785 | ||
786 | fs_info = end_io_wq->info; | |
787 | end_io_wq->error = bio->bi_error; | |
788 | ||
789 | if (bio_op(bio) == REQ_OP_WRITE) { | |
790 | if (end_io_wq->metadata == BTRFS_WQ_ENDIO_METADATA) { | |
791 | wq = fs_info->endio_meta_write_workers; | |
792 | func = btrfs_endio_meta_write_helper; | |
793 | } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_FREE_SPACE) { | |
794 | wq = fs_info->endio_freespace_worker; | |
795 | func = btrfs_freespace_write_helper; | |
796 | } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) { | |
797 | wq = fs_info->endio_raid56_workers; | |
798 | func = btrfs_endio_raid56_helper; | |
799 | } else { | |
800 | wq = fs_info->endio_write_workers; | |
801 | func = btrfs_endio_write_helper; | |
802 | } | |
803 | } else { | |
804 | if (unlikely(end_io_wq->metadata == | |
805 | BTRFS_WQ_ENDIO_DIO_REPAIR)) { | |
806 | wq = fs_info->endio_repair_workers; | |
807 | func = btrfs_endio_repair_helper; | |
808 | } else if (end_io_wq->metadata == BTRFS_WQ_ENDIO_RAID56) { | |
809 | wq = fs_info->endio_raid56_workers; | |
810 | func = btrfs_endio_raid56_helper; | |
811 | } else if (end_io_wq->metadata) { | |
812 | wq = fs_info->endio_meta_workers; | |
813 | func = btrfs_endio_meta_helper; | |
814 | } else { | |
815 | wq = fs_info->endio_workers; | |
816 | func = btrfs_endio_helper; | |
817 | } | |
818 | } | |
819 | ||
820 | btrfs_init_work(&end_io_wq->work, func, end_workqueue_fn, NULL, NULL); | |
821 | btrfs_queue_work(wq, &end_io_wq->work); | |
822 | } | |
823 | ||
824 | int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, | |
825 | enum btrfs_wq_endio_type metadata) | |
826 | { | |
827 | struct btrfs_end_io_wq *end_io_wq; | |
828 | ||
829 | end_io_wq = kmem_cache_alloc(btrfs_end_io_wq_cache, GFP_NOFS); | |
830 | if (!end_io_wq) | |
831 | return -ENOMEM; | |
832 | ||
833 | end_io_wq->private = bio->bi_private; | |
834 | end_io_wq->end_io = bio->bi_end_io; | |
835 | end_io_wq->info = info; | |
836 | end_io_wq->error = 0; | |
837 | end_io_wq->bio = bio; | |
838 | end_io_wq->metadata = metadata; | |
839 | ||
840 | bio->bi_private = end_io_wq; | |
841 | bio->bi_end_io = end_workqueue_bio; | |
842 | return 0; | |
843 | } | |
844 | ||
845 | unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info) | |
846 | { | |
847 | unsigned long limit = min_t(unsigned long, | |
848 | info->thread_pool_size, | |
849 | info->fs_devices->open_devices); | |
850 | return 256 * limit; | |
851 | } | |
852 | ||
853 | static void run_one_async_start(struct btrfs_work *work) | |
854 | { | |
855 | struct async_submit_bio *async; | |
856 | int ret; | |
857 | ||
858 | async = container_of(work, struct async_submit_bio, work); | |
859 | ret = async->submit_bio_start(async->inode, async->bio, | |
860 | async->mirror_num, async->bio_flags, | |
861 | async->bio_offset); | |
862 | if (ret) | |
863 | async->error = ret; | |
864 | } | |
865 | ||
866 | static void run_one_async_done(struct btrfs_work *work) | |
867 | { | |
868 | struct btrfs_fs_info *fs_info; | |
869 | struct async_submit_bio *async; | |
870 | int limit; | |
871 | ||
872 | async = container_of(work, struct async_submit_bio, work); | |
873 | fs_info = BTRFS_I(async->inode)->root->fs_info; | |
874 | ||
875 | limit = btrfs_async_submit_limit(fs_info); | |
876 | limit = limit * 2 / 3; | |
877 | ||
878 | /* | |
879 | * atomic_dec_return implies a barrier for waitqueue_active | |
880 | */ | |
881 | if (atomic_dec_return(&fs_info->nr_async_submits) < limit && | |
882 | waitqueue_active(&fs_info->async_submit_wait)) | |
883 | wake_up(&fs_info->async_submit_wait); | |
884 | ||
885 | /* If an error occurred we just want to clean up the bio and move on */ | |
886 | if (async->error) { | |
887 | async->bio->bi_error = async->error; | |
888 | bio_endio(async->bio); | |
889 | return; | |
890 | } | |
891 | ||
892 | async->submit_bio_done(async->inode, async->bio, async->mirror_num, | |
893 | async->bio_flags, async->bio_offset); | |
894 | } | |
895 | ||
896 | static void run_one_async_free(struct btrfs_work *work) | |
897 | { | |
898 | struct async_submit_bio *async; | |
899 | ||
900 | async = container_of(work, struct async_submit_bio, work); | |
901 | kfree(async); | |
902 | } | |
903 | ||
904 | int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, | |
905 | struct bio *bio, int mirror_num, | |
906 | unsigned long bio_flags, | |
907 | u64 bio_offset, | |
908 | extent_submit_bio_hook_t *submit_bio_start, | |
909 | extent_submit_bio_hook_t *submit_bio_done) | |
910 | { | |
911 | struct async_submit_bio *async; | |
912 | ||
913 | async = kmalloc(sizeof(*async), GFP_NOFS); | |
914 | if (!async) | |
915 | return -ENOMEM; | |
916 | ||
917 | async->inode = inode; | |
918 | async->bio = bio; | |
919 | async->mirror_num = mirror_num; | |
920 | async->submit_bio_start = submit_bio_start; | |
921 | async->submit_bio_done = submit_bio_done; | |
922 | ||
923 | btrfs_init_work(&async->work, btrfs_worker_helper, run_one_async_start, | |
924 | run_one_async_done, run_one_async_free); | |
925 | ||
926 | async->bio_flags = bio_flags; | |
927 | async->bio_offset = bio_offset; | |
928 | ||
929 | async->error = 0; | |
930 | ||
931 | atomic_inc(&fs_info->nr_async_submits); | |
932 | ||
933 | if (bio->bi_opf & REQ_SYNC) | |
934 | btrfs_set_work_high_priority(&async->work); | |
935 | ||
936 | btrfs_queue_work(fs_info->workers, &async->work); | |
937 | ||
938 | while (atomic_read(&fs_info->async_submit_draining) && | |
939 | atomic_read(&fs_info->nr_async_submits)) { | |
940 | wait_event(fs_info->async_submit_wait, | |
941 | (atomic_read(&fs_info->nr_async_submits) == 0)); | |
942 | } | |
943 | ||
944 | return 0; | |
945 | } | |
946 | ||
947 | static int btree_csum_one_bio(struct bio *bio) | |
948 | { | |
949 | struct bio_vec *bvec; | |
950 | struct btrfs_root *root; | |
951 | int i, ret = 0; | |
952 | ||
953 | bio_for_each_segment_all(bvec, bio, i) { | |
954 | root = BTRFS_I(bvec->bv_page->mapping->host)->root; | |
955 | ret = csum_dirty_buffer(root->fs_info, bvec->bv_page); | |
956 | if (ret) | |
957 | break; | |
958 | } | |
959 | ||
960 | return ret; | |
961 | } | |
962 | ||
963 | static int __btree_submit_bio_start(struct inode *inode, struct bio *bio, | |
964 | int mirror_num, unsigned long bio_flags, | |
965 | u64 bio_offset) | |
966 | { | |
967 | /* | |
968 | * when we're called for a write, we're already in the async | |
969 | * submission context. Just jump into btrfs_map_bio | |
970 | */ | |
971 | return btree_csum_one_bio(bio); | |
972 | } | |
973 | ||
974 | static int __btree_submit_bio_done(struct inode *inode, struct bio *bio, | |
975 | int mirror_num, unsigned long bio_flags, | |
976 | u64 bio_offset) | |
977 | { | |
978 | int ret; | |
979 | ||
980 | /* | |
981 | * when we're called for a write, we're already in the async | |
982 | * submission context. Just jump into btrfs_map_bio | |
983 | */ | |
984 | ret = btrfs_map_bio(BTRFS_I(inode)->root, bio, mirror_num, 1); | |
985 | if (ret) { | |
986 | bio->bi_error = ret; | |
987 | bio_endio(bio); | |
988 | } | |
989 | return ret; | |
990 | } | |
991 | ||
992 | static int check_async_write(struct inode *inode, unsigned long bio_flags) | |
993 | { | |
994 | if (bio_flags & EXTENT_BIO_TREE_LOG) | |
995 | return 0; | |
996 | #ifdef CONFIG_X86 | |
997 | if (static_cpu_has(X86_FEATURE_XMM4_2)) | |
998 | return 0; | |
999 | #endif | |
1000 | return 1; | |
1001 | } | |
1002 | ||
1003 | static int btree_submit_bio_hook(struct inode *inode, struct bio *bio, | |
1004 | int mirror_num, unsigned long bio_flags, | |
1005 | u64 bio_offset) | |
1006 | { | |
1007 | int async = check_async_write(inode, bio_flags); | |
1008 | int ret; | |
1009 | ||
1010 | if (bio_op(bio) != REQ_OP_WRITE) { | |
1011 | /* | |
1012 | * called for a read, do the setup so that checksum validation | |
1013 | * can happen in the async kernel threads | |
1014 | */ | |
1015 | ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info, | |
1016 | bio, BTRFS_WQ_ENDIO_METADATA); | |
1017 | if (ret) | |
1018 | goto out_w_error; | |
1019 | ret = btrfs_map_bio(BTRFS_I(inode)->root, bio, mirror_num, 0); | |
1020 | } else if (!async) { | |
1021 | ret = btree_csum_one_bio(bio); | |
1022 | if (ret) | |
1023 | goto out_w_error; | |
1024 | ret = btrfs_map_bio(BTRFS_I(inode)->root, bio, mirror_num, 0); | |
1025 | } else { | |
1026 | /* | |
1027 | * kthread helpers are used to submit writes so that | |
1028 | * checksumming can happen in parallel across all CPUs | |
1029 | */ | |
1030 | ret = btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, | |
1031 | inode, bio, mirror_num, 0, | |
1032 | bio_offset, | |
1033 | __btree_submit_bio_start, | |
1034 | __btree_submit_bio_done); | |
1035 | } | |
1036 | ||
1037 | if (ret) | |
1038 | goto out_w_error; | |
1039 | return 0; | |
1040 | ||
1041 | out_w_error: | |
1042 | bio->bi_error = ret; | |
1043 | bio_endio(bio); | |
1044 | return ret; | |
1045 | } | |
1046 | ||
1047 | #ifdef CONFIG_MIGRATION | |
1048 | static int btree_migratepage(struct address_space *mapping, | |
1049 | struct page *newpage, struct page *page, | |
1050 | enum migrate_mode mode) | |
1051 | { | |
1052 | /* | |
1053 | * we can't safely write a btree page from here, | |
1054 | * we haven't done the locking hook | |
1055 | */ | |
1056 | if (PageDirty(page)) | |
1057 | return -EAGAIN; | |
1058 | /* | |
1059 | * Buffers may be managed in a filesystem specific way. | |
1060 | * We must have no buffers or drop them. | |
1061 | */ | |
1062 | if (page_has_private(page) && | |
1063 | !try_to_release_page(page, GFP_KERNEL)) | |
1064 | return -EAGAIN; | |
1065 | return migrate_page(mapping, newpage, page, mode); | |
1066 | } | |
1067 | #endif | |
1068 | ||
1069 | ||
1070 | static int btree_writepages(struct address_space *mapping, | |
1071 | struct writeback_control *wbc) | |
1072 | { | |
1073 | struct btrfs_fs_info *fs_info; | |
1074 | int ret; | |
1075 | ||
1076 | if (wbc->sync_mode == WB_SYNC_NONE) { | |
1077 | ||
1078 | if (wbc->for_kupdate) | |
1079 | return 0; | |
1080 | ||
1081 | fs_info = BTRFS_I(mapping->host)->root->fs_info; | |
1082 | /* this is a bit racy, but that's ok */ | |
1083 | ret = percpu_counter_compare(&fs_info->dirty_metadata_bytes, | |
1084 | BTRFS_DIRTY_METADATA_THRESH); | |
1085 | if (ret < 0) | |
1086 | return 0; | |
1087 | } | |
1088 | return btree_write_cache_pages(mapping, wbc); | |
1089 | } | |
1090 | ||
1091 | static int btree_readpage(struct file *file, struct page *page) | |
1092 | { | |
1093 | struct extent_io_tree *tree; | |
1094 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
1095 | return extent_read_full_page(tree, page, btree_get_extent, 0); | |
1096 | } | |
1097 | ||
1098 | static int btree_releasepage(struct page *page, gfp_t gfp_flags) | |
1099 | { | |
1100 | if (PageWriteback(page) || PageDirty(page)) | |
1101 | return 0; | |
1102 | ||
1103 | return try_release_extent_buffer(page); | |
1104 | } | |
1105 | ||
1106 | static void btree_invalidatepage(struct page *page, unsigned int offset, | |
1107 | unsigned int length) | |
1108 | { | |
1109 | struct extent_io_tree *tree; | |
1110 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
1111 | extent_invalidatepage(tree, page, offset); | |
1112 | btree_releasepage(page, GFP_NOFS); | |
1113 | if (PagePrivate(page)) { | |
1114 | btrfs_warn(BTRFS_I(page->mapping->host)->root->fs_info, | |
1115 | "page private not zero on page %llu", | |
1116 | (unsigned long long)page_offset(page)); | |
1117 | ClearPagePrivate(page); | |
1118 | set_page_private(page, 0); | |
1119 | put_page(page); | |
1120 | } | |
1121 | } | |
1122 | ||
1123 | static int btree_set_page_dirty(struct page *page) | |
1124 | { | |
1125 | #ifdef DEBUG | |
1126 | struct extent_buffer *eb; | |
1127 | ||
1128 | BUG_ON(!PagePrivate(page)); | |
1129 | eb = (struct extent_buffer *)page->private; | |
1130 | BUG_ON(!eb); | |
1131 | BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
1132 | BUG_ON(!atomic_read(&eb->refs)); | |
1133 | btrfs_assert_tree_locked(eb); | |
1134 | #endif | |
1135 | return __set_page_dirty_nobuffers(page); | |
1136 | } | |
1137 | ||
1138 | static const struct address_space_operations btree_aops = { | |
1139 | .readpage = btree_readpage, | |
1140 | .writepages = btree_writepages, | |
1141 | .releasepage = btree_releasepage, | |
1142 | .invalidatepage = btree_invalidatepage, | |
1143 | #ifdef CONFIG_MIGRATION | |
1144 | .migratepage = btree_migratepage, | |
1145 | #endif | |
1146 | .set_page_dirty = btree_set_page_dirty, | |
1147 | }; | |
1148 | ||
1149 | void readahead_tree_block(struct btrfs_root *root, u64 bytenr) | |
1150 | { | |
1151 | struct extent_buffer *buf = NULL; | |
1152 | struct inode *btree_inode = root->fs_info->btree_inode; | |
1153 | ||
1154 | buf = btrfs_find_create_tree_block(root, bytenr); | |
1155 | if (IS_ERR(buf)) | |
1156 | return; | |
1157 | read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, | |
1158 | buf, WAIT_NONE, btree_get_extent, 0); | |
1159 | free_extent_buffer(buf); | |
1160 | } | |
1161 | ||
1162 | int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, | |
1163 | int mirror_num, struct extent_buffer **eb) | |
1164 | { | |
1165 | struct extent_buffer *buf = NULL; | |
1166 | struct inode *btree_inode = root->fs_info->btree_inode; | |
1167 | struct extent_io_tree *io_tree = &BTRFS_I(btree_inode)->io_tree; | |
1168 | int ret; | |
1169 | ||
1170 | buf = btrfs_find_create_tree_block(root, bytenr); | |
1171 | if (IS_ERR(buf)) | |
1172 | return 0; | |
1173 | ||
1174 | set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags); | |
1175 | ||
1176 | ret = read_extent_buffer_pages(io_tree, buf, WAIT_PAGE_LOCK, | |
1177 | btree_get_extent, mirror_num); | |
1178 | if (ret) { | |
1179 | free_extent_buffer(buf); | |
1180 | return ret; | |
1181 | } | |
1182 | ||
1183 | if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) { | |
1184 | free_extent_buffer(buf); | |
1185 | return -EIO; | |
1186 | } else if (extent_buffer_uptodate(buf)) { | |
1187 | *eb = buf; | |
1188 | } else { | |
1189 | free_extent_buffer(buf); | |
1190 | } | |
1191 | return 0; | |
1192 | } | |
1193 | ||
1194 | struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, | |
1195 | u64 bytenr) | |
1196 | { | |
1197 | if (btrfs_is_testing(root->fs_info)) | |
1198 | return alloc_test_extent_buffer(root->fs_info, bytenr); | |
1199 | return alloc_extent_buffer(root->fs_info, bytenr); | |
1200 | } | |
1201 | ||
1202 | ||
1203 | int btrfs_write_tree_block(struct extent_buffer *buf) | |
1204 | { | |
1205 | return filemap_fdatawrite_range(buf->pages[0]->mapping, buf->start, | |
1206 | buf->start + buf->len - 1); | |
1207 | } | |
1208 | ||
1209 | int btrfs_wait_tree_block_writeback(struct extent_buffer *buf) | |
1210 | { | |
1211 | return filemap_fdatawait_range(buf->pages[0]->mapping, | |
1212 | buf->start, buf->start + buf->len - 1); | |
1213 | } | |
1214 | ||
1215 | struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, | |
1216 | u64 parent_transid) | |
1217 | { | |
1218 | struct extent_buffer *buf = NULL; | |
1219 | int ret; | |
1220 | ||
1221 | buf = btrfs_find_create_tree_block(root, bytenr); | |
1222 | if (IS_ERR(buf)) | |
1223 | return buf; | |
1224 | ||
1225 | ret = btree_read_extent_buffer_pages(root, buf, parent_transid); | |
1226 | if (ret) { | |
1227 | free_extent_buffer(buf); | |
1228 | return ERR_PTR(ret); | |
1229 | } | |
1230 | return buf; | |
1231 | ||
1232 | } | |
1233 | ||
1234 | void clean_tree_block(struct btrfs_trans_handle *trans, | |
1235 | struct btrfs_fs_info *fs_info, | |
1236 | struct extent_buffer *buf) | |
1237 | { | |
1238 | if (btrfs_header_generation(buf) == | |
1239 | fs_info->running_transaction->transid) { | |
1240 | btrfs_assert_tree_locked(buf); | |
1241 | ||
1242 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) { | |
1243 | __percpu_counter_add(&fs_info->dirty_metadata_bytes, | |
1244 | -buf->len, | |
1245 | fs_info->dirty_metadata_batch); | |
1246 | /* ugh, clear_extent_buffer_dirty needs to lock the page */ | |
1247 | btrfs_set_lock_blocking(buf); | |
1248 | clear_extent_buffer_dirty(buf); | |
1249 | } | |
1250 | } | |
1251 | } | |
1252 | ||
1253 | static struct btrfs_subvolume_writers *btrfs_alloc_subvolume_writers(void) | |
1254 | { | |
1255 | struct btrfs_subvolume_writers *writers; | |
1256 | int ret; | |
1257 | ||
1258 | writers = kmalloc(sizeof(*writers), GFP_NOFS); | |
1259 | if (!writers) | |
1260 | return ERR_PTR(-ENOMEM); | |
1261 | ||
1262 | ret = percpu_counter_init(&writers->counter, 0, GFP_KERNEL); | |
1263 | if (ret < 0) { | |
1264 | kfree(writers); | |
1265 | return ERR_PTR(ret); | |
1266 | } | |
1267 | ||
1268 | init_waitqueue_head(&writers->wait); | |
1269 | return writers; | |
1270 | } | |
1271 | ||
1272 | static void | |
1273 | btrfs_free_subvolume_writers(struct btrfs_subvolume_writers *writers) | |
1274 | { | |
1275 | percpu_counter_destroy(&writers->counter); | |
1276 | kfree(writers); | |
1277 | } | |
1278 | ||
1279 | static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info, | |
1280 | u64 objectid) | |
1281 | { | |
1282 | bool dummy = test_bit(BTRFS_FS_STATE_DUMMY_FS_INFO, &fs_info->fs_state); | |
1283 | root->node = NULL; | |
1284 | root->commit_root = NULL; | |
1285 | root->state = 0; | |
1286 | root->orphan_cleanup_state = 0; | |
1287 | ||
1288 | root->objectid = objectid; | |
1289 | root->last_trans = 0; | |
1290 | root->highest_objectid = 0; | |
1291 | root->nr_delalloc_inodes = 0; | |
1292 | root->nr_ordered_extents = 0; | |
1293 | root->name = NULL; | |
1294 | root->inode_tree = RB_ROOT; | |
1295 | INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC); | |
1296 | root->block_rsv = NULL; | |
1297 | root->orphan_block_rsv = NULL; | |
1298 | ||
1299 | INIT_LIST_HEAD(&root->dirty_list); | |
1300 | INIT_LIST_HEAD(&root->root_list); | |
1301 | INIT_LIST_HEAD(&root->delalloc_inodes); | |
1302 | INIT_LIST_HEAD(&root->delalloc_root); | |
1303 | INIT_LIST_HEAD(&root->ordered_extents); | |
1304 | INIT_LIST_HEAD(&root->ordered_root); | |
1305 | INIT_LIST_HEAD(&root->logged_list[0]); | |
1306 | INIT_LIST_HEAD(&root->logged_list[1]); | |
1307 | spin_lock_init(&root->orphan_lock); | |
1308 | spin_lock_init(&root->inode_lock); | |
1309 | spin_lock_init(&root->delalloc_lock); | |
1310 | spin_lock_init(&root->ordered_extent_lock); | |
1311 | spin_lock_init(&root->accounting_lock); | |
1312 | spin_lock_init(&root->log_extents_lock[0]); | |
1313 | spin_lock_init(&root->log_extents_lock[1]); | |
1314 | mutex_init(&root->objectid_mutex); | |
1315 | mutex_init(&root->log_mutex); | |
1316 | mutex_init(&root->ordered_extent_mutex); | |
1317 | mutex_init(&root->delalloc_mutex); | |
1318 | init_waitqueue_head(&root->log_writer_wait); | |
1319 | init_waitqueue_head(&root->log_commit_wait[0]); | |
1320 | init_waitqueue_head(&root->log_commit_wait[1]); | |
1321 | INIT_LIST_HEAD(&root->log_ctxs[0]); | |
1322 | INIT_LIST_HEAD(&root->log_ctxs[1]); | |
1323 | atomic_set(&root->log_commit[0], 0); | |
1324 | atomic_set(&root->log_commit[1], 0); | |
1325 | atomic_set(&root->log_writers, 0); | |
1326 | atomic_set(&root->log_batch, 0); | |
1327 | atomic_set(&root->orphan_inodes, 0); | |
1328 | atomic_set(&root->refs, 1); | |
1329 | atomic_set(&root->will_be_snapshoted, 0); | |
1330 | atomic_set(&root->qgroup_meta_rsv, 0); | |
1331 | root->log_transid = 0; | |
1332 | root->log_transid_committed = -1; | |
1333 | root->last_log_commit = 0; | |
1334 | if (!dummy) | |
1335 | extent_io_tree_init(&root->dirty_log_pages, | |
1336 | fs_info->btree_inode->i_mapping); | |
1337 | ||
1338 | memset(&root->root_key, 0, sizeof(root->root_key)); | |
1339 | memset(&root->root_item, 0, sizeof(root->root_item)); | |
1340 | memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); | |
1341 | if (!dummy) | |
1342 | root->defrag_trans_start = fs_info->generation; | |
1343 | else | |
1344 | root->defrag_trans_start = 0; | |
1345 | root->root_key.objectid = objectid; | |
1346 | root->anon_dev = 0; | |
1347 | ||
1348 | spin_lock_init(&root->root_item_lock); | |
1349 | } | |
1350 | ||
1351 | static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info, | |
1352 | gfp_t flags) | |
1353 | { | |
1354 | struct btrfs_root *root = kzalloc(sizeof(*root), flags); | |
1355 | if (root) | |
1356 | root->fs_info = fs_info; | |
1357 | return root; | |
1358 | } | |
1359 | ||
1360 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS | |
1361 | /* Should only be used by the testing infrastructure */ | |
1362 | struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info) | |
1363 | { | |
1364 | struct btrfs_root *root; | |
1365 | ||
1366 | if (!fs_info) | |
1367 | return ERR_PTR(-EINVAL); | |
1368 | ||
1369 | root = btrfs_alloc_root(fs_info, GFP_KERNEL); | |
1370 | if (!root) | |
1371 | return ERR_PTR(-ENOMEM); | |
1372 | ||
1373 | /* We don't use the stripesize in selftest, set it as sectorsize */ | |
1374 | __setup_root(root, fs_info, BTRFS_ROOT_TREE_OBJECTID); | |
1375 | root->alloc_bytenr = 0; | |
1376 | ||
1377 | return root; | |
1378 | } | |
1379 | #endif | |
1380 | ||
1381 | struct btrfs_root *btrfs_create_tree(struct btrfs_trans_handle *trans, | |
1382 | struct btrfs_fs_info *fs_info, | |
1383 | u64 objectid) | |
1384 | { | |
1385 | struct extent_buffer *leaf; | |
1386 | struct btrfs_root *tree_root = fs_info->tree_root; | |
1387 | struct btrfs_root *root; | |
1388 | struct btrfs_key key; | |
1389 | int ret = 0; | |
1390 | uuid_le uuid; | |
1391 | ||
1392 | root = btrfs_alloc_root(fs_info, GFP_KERNEL); | |
1393 | if (!root) | |
1394 | return ERR_PTR(-ENOMEM); | |
1395 | ||
1396 | __setup_root(root, fs_info, objectid); | |
1397 | root->root_key.objectid = objectid; | |
1398 | root->root_key.type = BTRFS_ROOT_ITEM_KEY; | |
1399 | root->root_key.offset = 0; | |
1400 | ||
1401 | leaf = btrfs_alloc_tree_block(trans, root, 0, objectid, NULL, 0, 0, 0); | |
1402 | if (IS_ERR(leaf)) { | |
1403 | ret = PTR_ERR(leaf); | |
1404 | leaf = NULL; | |
1405 | goto fail; | |
1406 | } | |
1407 | ||
1408 | memzero_extent_buffer(leaf, 0, sizeof(struct btrfs_header)); | |
1409 | btrfs_set_header_bytenr(leaf, leaf->start); | |
1410 | btrfs_set_header_generation(leaf, trans->transid); | |
1411 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); | |
1412 | btrfs_set_header_owner(leaf, objectid); | |
1413 | root->node = leaf; | |
1414 | ||
1415 | write_extent_buffer_fsid(leaf, fs_info->fsid); | |
1416 | write_extent_buffer_chunk_tree_uuid(leaf, fs_info->chunk_tree_uuid); | |
1417 | btrfs_mark_buffer_dirty(leaf); | |
1418 | ||
1419 | root->commit_root = btrfs_root_node(root); | |
1420 | set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); | |
1421 | ||
1422 | root->root_item.flags = 0; | |
1423 | root->root_item.byte_limit = 0; | |
1424 | btrfs_set_root_bytenr(&root->root_item, leaf->start); | |
1425 | btrfs_set_root_generation(&root->root_item, trans->transid); | |
1426 | btrfs_set_root_level(&root->root_item, 0); | |
1427 | btrfs_set_root_refs(&root->root_item, 1); | |
1428 | btrfs_set_root_used(&root->root_item, leaf->len); | |
1429 | btrfs_set_root_last_snapshot(&root->root_item, 0); | |
1430 | btrfs_set_root_dirid(&root->root_item, 0); | |
1431 | uuid_le_gen(&uuid); | |
1432 | memcpy(root->root_item.uuid, uuid.b, BTRFS_UUID_SIZE); | |
1433 | root->root_item.drop_level = 0; | |
1434 | ||
1435 | key.objectid = objectid; | |
1436 | key.type = BTRFS_ROOT_ITEM_KEY; | |
1437 | key.offset = 0; | |
1438 | ret = btrfs_insert_root(trans, tree_root, &key, &root->root_item); | |
1439 | if (ret) | |
1440 | goto fail; | |
1441 | ||
1442 | btrfs_tree_unlock(leaf); | |
1443 | ||
1444 | return root; | |
1445 | ||
1446 | fail: | |
1447 | if (leaf) { | |
1448 | btrfs_tree_unlock(leaf); | |
1449 | free_extent_buffer(root->commit_root); | |
1450 | free_extent_buffer(leaf); | |
1451 | } | |
1452 | kfree(root); | |
1453 | ||
1454 | return ERR_PTR(ret); | |
1455 | } | |
1456 | ||
1457 | static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans, | |
1458 | struct btrfs_fs_info *fs_info) | |
1459 | { | |
1460 | struct btrfs_root *root; | |
1461 | struct extent_buffer *leaf; | |
1462 | ||
1463 | root = btrfs_alloc_root(fs_info, GFP_NOFS); | |
1464 | if (!root) | |
1465 | return ERR_PTR(-ENOMEM); | |
1466 | ||
1467 | __setup_root(root, fs_info, BTRFS_TREE_LOG_OBJECTID); | |
1468 | ||
1469 | root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; | |
1470 | root->root_key.type = BTRFS_ROOT_ITEM_KEY; | |
1471 | root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; | |
1472 | ||
1473 | /* | |
1474 | * DON'T set REF_COWS for log trees | |
1475 | * | |
1476 | * log trees do not get reference counted because they go away | |
1477 | * before a real commit is actually done. They do store pointers | |
1478 | * to file data extents, and those reference counts still get | |
1479 | * updated (along with back refs to the log tree). | |
1480 | */ | |
1481 | ||
1482 | leaf = btrfs_alloc_tree_block(trans, root, 0, BTRFS_TREE_LOG_OBJECTID, | |
1483 | NULL, 0, 0, 0); | |
1484 | if (IS_ERR(leaf)) { | |
1485 | kfree(root); | |
1486 | return ERR_CAST(leaf); | |
1487 | } | |
1488 | ||
1489 | memzero_extent_buffer(leaf, 0, sizeof(struct btrfs_header)); | |
1490 | btrfs_set_header_bytenr(leaf, leaf->start); | |
1491 | btrfs_set_header_generation(leaf, trans->transid); | |
1492 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); | |
1493 | btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID); | |
1494 | root->node = leaf; | |
1495 | ||
1496 | write_extent_buffer_fsid(root->node, root->fs_info->fsid); | |
1497 | btrfs_mark_buffer_dirty(root->node); | |
1498 | btrfs_tree_unlock(root->node); | |
1499 | return root; | |
1500 | } | |
1501 | ||
1502 | int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, | |
1503 | struct btrfs_fs_info *fs_info) | |
1504 | { | |
1505 | struct btrfs_root *log_root; | |
1506 | ||
1507 | log_root = alloc_log_tree(trans, fs_info); | |
1508 | if (IS_ERR(log_root)) | |
1509 | return PTR_ERR(log_root); | |
1510 | WARN_ON(fs_info->log_root_tree); | |
1511 | fs_info->log_root_tree = log_root; | |
1512 | return 0; | |
1513 | } | |
1514 | ||
1515 | int btrfs_add_log_tree(struct btrfs_trans_handle *trans, | |
1516 | struct btrfs_root *root) | |
1517 | { | |
1518 | struct btrfs_root *log_root; | |
1519 | struct btrfs_inode_item *inode_item; | |
1520 | ||
1521 | log_root = alloc_log_tree(trans, root->fs_info); | |
1522 | if (IS_ERR(log_root)) | |
1523 | return PTR_ERR(log_root); | |
1524 | ||
1525 | log_root->last_trans = trans->transid; | |
1526 | log_root->root_key.offset = root->root_key.objectid; | |
1527 | ||
1528 | inode_item = &log_root->root_item.inode; | |
1529 | btrfs_set_stack_inode_generation(inode_item, 1); | |
1530 | btrfs_set_stack_inode_size(inode_item, 3); | |
1531 | btrfs_set_stack_inode_nlink(inode_item, 1); | |
1532 | btrfs_set_stack_inode_nbytes(inode_item, | |
1533 | root->fs_info->nodesize); | |
1534 | btrfs_set_stack_inode_mode(inode_item, S_IFDIR | 0755); | |
1535 | ||
1536 | btrfs_set_root_node(&log_root->root_item, log_root->node); | |
1537 | ||
1538 | WARN_ON(root->log_root); | |
1539 | root->log_root = log_root; | |
1540 | root->log_transid = 0; | |
1541 | root->log_transid_committed = -1; | |
1542 | root->last_log_commit = 0; | |
1543 | return 0; | |
1544 | } | |
1545 | ||
1546 | static struct btrfs_root *btrfs_read_tree_root(struct btrfs_root *tree_root, | |
1547 | struct btrfs_key *key) | |
1548 | { | |
1549 | struct btrfs_root *root; | |
1550 | struct btrfs_fs_info *fs_info = tree_root->fs_info; | |
1551 | struct btrfs_path *path; | |
1552 | u64 generation; | |
1553 | int ret; | |
1554 | ||
1555 | path = btrfs_alloc_path(); | |
1556 | if (!path) | |
1557 | return ERR_PTR(-ENOMEM); | |
1558 | ||
1559 | root = btrfs_alloc_root(fs_info, GFP_NOFS); | |
1560 | if (!root) { | |
1561 | ret = -ENOMEM; | |
1562 | goto alloc_fail; | |
1563 | } | |
1564 | ||
1565 | __setup_root(root, fs_info, key->objectid); | |
1566 | ||
1567 | ret = btrfs_find_root(tree_root, key, path, | |
1568 | &root->root_item, &root->root_key); | |
1569 | if (ret) { | |
1570 | if (ret > 0) | |
1571 | ret = -ENOENT; | |
1572 | goto find_fail; | |
1573 | } | |
1574 | ||
1575 | generation = btrfs_root_generation(&root->root_item); | |
1576 | root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), | |
1577 | generation); | |
1578 | if (IS_ERR(root->node)) { | |
1579 | ret = PTR_ERR(root->node); | |
1580 | goto find_fail; | |
1581 | } else if (!btrfs_buffer_uptodate(root->node, generation, 0)) { | |
1582 | ret = -EIO; | |
1583 | free_extent_buffer(root->node); | |
1584 | goto find_fail; | |
1585 | } | |
1586 | root->commit_root = btrfs_root_node(root); | |
1587 | out: | |
1588 | btrfs_free_path(path); | |
1589 | return root; | |
1590 | ||
1591 | find_fail: | |
1592 | kfree(root); | |
1593 | alloc_fail: | |
1594 | root = ERR_PTR(ret); | |
1595 | goto out; | |
1596 | } | |
1597 | ||
1598 | struct btrfs_root *btrfs_read_fs_root(struct btrfs_root *tree_root, | |
1599 | struct btrfs_key *location) | |
1600 | { | |
1601 | struct btrfs_root *root; | |
1602 | ||
1603 | root = btrfs_read_tree_root(tree_root, location); | |
1604 | if (IS_ERR(root)) | |
1605 | return root; | |
1606 | ||
1607 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { | |
1608 | set_bit(BTRFS_ROOT_REF_COWS, &root->state); | |
1609 | btrfs_check_and_init_root_item(&root->root_item); | |
1610 | } | |
1611 | ||
1612 | return root; | |
1613 | } | |
1614 | ||
1615 | int btrfs_init_fs_root(struct btrfs_root *root) | |
1616 | { | |
1617 | int ret; | |
1618 | struct btrfs_subvolume_writers *writers; | |
1619 | ||
1620 | root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS); | |
1621 | root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned), | |
1622 | GFP_NOFS); | |
1623 | if (!root->free_ino_pinned || !root->free_ino_ctl) { | |
1624 | ret = -ENOMEM; | |
1625 | goto fail; | |
1626 | } | |
1627 | ||
1628 | writers = btrfs_alloc_subvolume_writers(); | |
1629 | if (IS_ERR(writers)) { | |
1630 | ret = PTR_ERR(writers); | |
1631 | goto fail; | |
1632 | } | |
1633 | root->subv_writers = writers; | |
1634 | ||
1635 | btrfs_init_free_ino_ctl(root); | |
1636 | spin_lock_init(&root->ino_cache_lock); | |
1637 | init_waitqueue_head(&root->ino_cache_wait); | |
1638 | ||
1639 | ret = get_anon_bdev(&root->anon_dev); | |
1640 | if (ret) | |
1641 | goto fail; | |
1642 | ||
1643 | mutex_lock(&root->objectid_mutex); | |
1644 | ret = btrfs_find_highest_objectid(root, | |
1645 | &root->highest_objectid); | |
1646 | if (ret) { | |
1647 | mutex_unlock(&root->objectid_mutex); | |
1648 | goto fail; | |
1649 | } | |
1650 | ||
1651 | ASSERT(root->highest_objectid <= BTRFS_LAST_FREE_OBJECTID); | |
1652 | ||
1653 | mutex_unlock(&root->objectid_mutex); | |
1654 | ||
1655 | return 0; | |
1656 | fail: | |
1657 | /* the caller is responsible to call free_fs_root */ | |
1658 | return ret; | |
1659 | } | |
1660 | ||
1661 | struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, | |
1662 | u64 root_id) | |
1663 | { | |
1664 | struct btrfs_root *root; | |
1665 | ||
1666 | spin_lock(&fs_info->fs_roots_radix_lock); | |
1667 | root = radix_tree_lookup(&fs_info->fs_roots_radix, | |
1668 | (unsigned long)root_id); | |
1669 | spin_unlock(&fs_info->fs_roots_radix_lock); | |
1670 | return root; | |
1671 | } | |
1672 | ||
1673 | int btrfs_insert_fs_root(struct btrfs_fs_info *fs_info, | |
1674 | struct btrfs_root *root) | |
1675 | { | |
1676 | int ret; | |
1677 | ||
1678 | ret = radix_tree_preload(GFP_NOFS); | |
1679 | if (ret) | |
1680 | return ret; | |
1681 | ||
1682 | spin_lock(&fs_info->fs_roots_radix_lock); | |
1683 | ret = radix_tree_insert(&fs_info->fs_roots_radix, | |
1684 | (unsigned long)root->root_key.objectid, | |
1685 | root); | |
1686 | if (ret == 0) | |
1687 | set_bit(BTRFS_ROOT_IN_RADIX, &root->state); | |
1688 | spin_unlock(&fs_info->fs_roots_radix_lock); | |
1689 | radix_tree_preload_end(); | |
1690 | ||
1691 | return ret; | |
1692 | } | |
1693 | ||
1694 | struct btrfs_root *btrfs_get_fs_root(struct btrfs_fs_info *fs_info, | |
1695 | struct btrfs_key *location, | |
1696 | bool check_ref) | |
1697 | { | |
1698 | struct btrfs_root *root; | |
1699 | struct btrfs_path *path; | |
1700 | struct btrfs_key key; | |
1701 | int ret; | |
1702 | ||
1703 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1704 | return fs_info->tree_root; | |
1705 | if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) | |
1706 | return fs_info->extent_root; | |
1707 | if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) | |
1708 | return fs_info->chunk_root; | |
1709 | if (location->objectid == BTRFS_DEV_TREE_OBJECTID) | |
1710 | return fs_info->dev_root; | |
1711 | if (location->objectid == BTRFS_CSUM_TREE_OBJECTID) | |
1712 | return fs_info->csum_root; | |
1713 | if (location->objectid == BTRFS_QUOTA_TREE_OBJECTID) | |
1714 | return fs_info->quota_root ? fs_info->quota_root : | |
1715 | ERR_PTR(-ENOENT); | |
1716 | if (location->objectid == BTRFS_UUID_TREE_OBJECTID) | |
1717 | return fs_info->uuid_root ? fs_info->uuid_root : | |
1718 | ERR_PTR(-ENOENT); | |
1719 | if (location->objectid == BTRFS_FREE_SPACE_TREE_OBJECTID) | |
1720 | return fs_info->free_space_root ? fs_info->free_space_root : | |
1721 | ERR_PTR(-ENOENT); | |
1722 | again: | |
1723 | root = btrfs_lookup_fs_root(fs_info, location->objectid); | |
1724 | if (root) { | |
1725 | if (check_ref && btrfs_root_refs(&root->root_item) == 0) | |
1726 | return ERR_PTR(-ENOENT); | |
1727 | return root; | |
1728 | } | |
1729 | ||
1730 | root = btrfs_read_fs_root(fs_info->tree_root, location); | |
1731 | if (IS_ERR(root)) | |
1732 | return root; | |
1733 | ||
1734 | if (check_ref && btrfs_root_refs(&root->root_item) == 0) { | |
1735 | ret = -ENOENT; | |
1736 | goto fail; | |
1737 | } | |
1738 | ||
1739 | ret = btrfs_init_fs_root(root); | |
1740 | if (ret) | |
1741 | goto fail; | |
1742 | ||
1743 | path = btrfs_alloc_path(); | |
1744 | if (!path) { | |
1745 | ret = -ENOMEM; | |
1746 | goto fail; | |
1747 | } | |
1748 | key.objectid = BTRFS_ORPHAN_OBJECTID; | |
1749 | key.type = BTRFS_ORPHAN_ITEM_KEY; | |
1750 | key.offset = location->objectid; | |
1751 | ||
1752 | ret = btrfs_search_slot(NULL, fs_info->tree_root, &key, path, 0, 0); | |
1753 | btrfs_free_path(path); | |
1754 | if (ret < 0) | |
1755 | goto fail; | |
1756 | if (ret == 0) | |
1757 | set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &root->state); | |
1758 | ||
1759 | ret = btrfs_insert_fs_root(fs_info, root); | |
1760 | if (ret) { | |
1761 | if (ret == -EEXIST) { | |
1762 | free_fs_root(root); | |
1763 | goto again; | |
1764 | } | |
1765 | goto fail; | |
1766 | } | |
1767 | return root; | |
1768 | fail: | |
1769 | free_fs_root(root); | |
1770 | return ERR_PTR(ret); | |
1771 | } | |
1772 | ||
1773 | static int btrfs_congested_fn(void *congested_data, int bdi_bits) | |
1774 | { | |
1775 | struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; | |
1776 | int ret = 0; | |
1777 | struct btrfs_device *device; | |
1778 | struct backing_dev_info *bdi; | |
1779 | ||
1780 | rcu_read_lock(); | |
1781 | list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) { | |
1782 | if (!device->bdev) | |
1783 | continue; | |
1784 | bdi = blk_get_backing_dev_info(device->bdev); | |
1785 | if (bdi_congested(bdi, bdi_bits)) { | |
1786 | ret = 1; | |
1787 | break; | |
1788 | } | |
1789 | } | |
1790 | rcu_read_unlock(); | |
1791 | return ret; | |
1792 | } | |
1793 | ||
1794 | static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) | |
1795 | { | |
1796 | int err; | |
1797 | ||
1798 | err = bdi_setup_and_register(bdi, "btrfs"); | |
1799 | if (err) | |
1800 | return err; | |
1801 | ||
1802 | bdi->ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_SIZE; | |
1803 | bdi->congested_fn = btrfs_congested_fn; | |
1804 | bdi->congested_data = info; | |
1805 | bdi->capabilities |= BDI_CAP_CGROUP_WRITEBACK; | |
1806 | return 0; | |
1807 | } | |
1808 | ||
1809 | /* | |
1810 | * called by the kthread helper functions to finally call the bio end_io | |
1811 | * functions. This is where read checksum verification actually happens | |
1812 | */ | |
1813 | static void end_workqueue_fn(struct btrfs_work *work) | |
1814 | { | |
1815 | struct bio *bio; | |
1816 | struct btrfs_end_io_wq *end_io_wq; | |
1817 | ||
1818 | end_io_wq = container_of(work, struct btrfs_end_io_wq, work); | |
1819 | bio = end_io_wq->bio; | |
1820 | ||
1821 | bio->bi_error = end_io_wq->error; | |
1822 | bio->bi_private = end_io_wq->private; | |
1823 | bio->bi_end_io = end_io_wq->end_io; | |
1824 | kmem_cache_free(btrfs_end_io_wq_cache, end_io_wq); | |
1825 | bio_endio(bio); | |
1826 | } | |
1827 | ||
1828 | static int cleaner_kthread(void *arg) | |
1829 | { | |
1830 | struct btrfs_root *root = arg; | |
1831 | int again; | |
1832 | struct btrfs_trans_handle *trans; | |
1833 | ||
1834 | do { | |
1835 | again = 0; | |
1836 | ||
1837 | /* Make the cleaner go to sleep early. */ | |
1838 | if (btrfs_need_cleaner_sleep(root)) | |
1839 | goto sleep; | |
1840 | ||
1841 | /* | |
1842 | * Do not do anything if we might cause open_ctree() to block | |
1843 | * before we have finished mounting the filesystem. | |
1844 | */ | |
1845 | if (!test_bit(BTRFS_FS_OPEN, &root->fs_info->flags)) | |
1846 | goto sleep; | |
1847 | ||
1848 | if (!mutex_trylock(&root->fs_info->cleaner_mutex)) | |
1849 | goto sleep; | |
1850 | ||
1851 | /* | |
1852 | * Avoid the problem that we change the status of the fs | |
1853 | * during the above check and trylock. | |
1854 | */ | |
1855 | if (btrfs_need_cleaner_sleep(root)) { | |
1856 | mutex_unlock(&root->fs_info->cleaner_mutex); | |
1857 | goto sleep; | |
1858 | } | |
1859 | ||
1860 | mutex_lock(&root->fs_info->cleaner_delayed_iput_mutex); | |
1861 | btrfs_run_delayed_iputs(root); | |
1862 | mutex_unlock(&root->fs_info->cleaner_delayed_iput_mutex); | |
1863 | ||
1864 | again = btrfs_clean_one_deleted_snapshot(root); | |
1865 | mutex_unlock(&root->fs_info->cleaner_mutex); | |
1866 | ||
1867 | /* | |
1868 | * The defragger has dealt with the R/O remount and umount, | |
1869 | * needn't do anything special here. | |
1870 | */ | |
1871 | btrfs_run_defrag_inodes(root->fs_info); | |
1872 | ||
1873 | /* | |
1874 | * Acquires fs_info->delete_unused_bgs_mutex to avoid racing | |
1875 | * with relocation (btrfs_relocate_chunk) and relocation | |
1876 | * acquires fs_info->cleaner_mutex (btrfs_relocate_block_group) | |
1877 | * after acquiring fs_info->delete_unused_bgs_mutex. So we | |
1878 | * can't hold, nor need to, fs_info->cleaner_mutex when deleting | |
1879 | * unused block groups. | |
1880 | */ | |
1881 | btrfs_delete_unused_bgs(root->fs_info); | |
1882 | sleep: | |
1883 | if (!again) { | |
1884 | set_current_state(TASK_INTERRUPTIBLE); | |
1885 | if (!kthread_should_stop()) | |
1886 | schedule(); | |
1887 | __set_current_state(TASK_RUNNING); | |
1888 | } | |
1889 | } while (!kthread_should_stop()); | |
1890 | ||
1891 | /* | |
1892 | * Transaction kthread is stopped before us and wakes us up. | |
1893 | * However we might have started a new transaction and COWed some | |
1894 | * tree blocks when deleting unused block groups for example. So | |
1895 | * make sure we commit the transaction we started to have a clean | |
1896 | * shutdown when evicting the btree inode - if it has dirty pages | |
1897 | * when we do the final iput() on it, eviction will trigger a | |
1898 | * writeback for it which will fail with null pointer dereferences | |
1899 | * since work queues and other resources were already released and | |
1900 | * destroyed by the time the iput/eviction/writeback is made. | |
1901 | */ | |
1902 | trans = btrfs_attach_transaction(root); | |
1903 | if (IS_ERR(trans)) { | |
1904 | if (PTR_ERR(trans) != -ENOENT) | |
1905 | btrfs_err(root->fs_info, | |
1906 | "cleaner transaction attach returned %ld", | |
1907 | PTR_ERR(trans)); | |
1908 | } else { | |
1909 | int ret; | |
1910 | ||
1911 | ret = btrfs_commit_transaction(trans, root); | |
1912 | if (ret) | |
1913 | btrfs_err(root->fs_info, | |
1914 | "cleaner open transaction commit returned %d", | |
1915 | ret); | |
1916 | } | |
1917 | ||
1918 | return 0; | |
1919 | } | |
1920 | ||
1921 | static int transaction_kthread(void *arg) | |
1922 | { | |
1923 | struct btrfs_root *root = arg; | |
1924 | struct btrfs_trans_handle *trans; | |
1925 | struct btrfs_transaction *cur; | |
1926 | u64 transid; | |
1927 | unsigned long now; | |
1928 | unsigned long delay; | |
1929 | bool cannot_commit; | |
1930 | ||
1931 | do { | |
1932 | cannot_commit = false; | |
1933 | delay = HZ * root->fs_info->commit_interval; | |
1934 | mutex_lock(&root->fs_info->transaction_kthread_mutex); | |
1935 | ||
1936 | spin_lock(&root->fs_info->trans_lock); | |
1937 | cur = root->fs_info->running_transaction; | |
1938 | if (!cur) { | |
1939 | spin_unlock(&root->fs_info->trans_lock); | |
1940 | goto sleep; | |
1941 | } | |
1942 | ||
1943 | now = get_seconds(); | |
1944 | if (cur->state < TRANS_STATE_BLOCKED && | |
1945 | (now < cur->start_time || | |
1946 | now - cur->start_time < root->fs_info->commit_interval)) { | |
1947 | spin_unlock(&root->fs_info->trans_lock); | |
1948 | delay = HZ * 5; | |
1949 | goto sleep; | |
1950 | } | |
1951 | transid = cur->transid; | |
1952 | spin_unlock(&root->fs_info->trans_lock); | |
1953 | ||
1954 | /* If the file system is aborted, this will always fail. */ | |
1955 | trans = btrfs_attach_transaction(root); | |
1956 | if (IS_ERR(trans)) { | |
1957 | if (PTR_ERR(trans) != -ENOENT) | |
1958 | cannot_commit = true; | |
1959 | goto sleep; | |
1960 | } | |
1961 | if (transid == trans->transid) { | |
1962 | btrfs_commit_transaction(trans, root); | |
1963 | } else { | |
1964 | btrfs_end_transaction(trans, root); | |
1965 | } | |
1966 | sleep: | |
1967 | wake_up_process(root->fs_info->cleaner_kthread); | |
1968 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
1969 | ||
1970 | if (unlikely(test_bit(BTRFS_FS_STATE_ERROR, | |
1971 | &root->fs_info->fs_state))) | |
1972 | btrfs_cleanup_transaction(root); | |
1973 | set_current_state(TASK_INTERRUPTIBLE); | |
1974 | if (!kthread_should_stop() && | |
1975 | (!btrfs_transaction_blocked(root->fs_info) || | |
1976 | cannot_commit)) | |
1977 | schedule_timeout(delay); | |
1978 | __set_current_state(TASK_RUNNING); | |
1979 | } while (!kthread_should_stop()); | |
1980 | return 0; | |
1981 | } | |
1982 | ||
1983 | /* | |
1984 | * this will find the highest generation in the array of | |
1985 | * root backups. The index of the highest array is returned, | |
1986 | * or -1 if we can't find anything. | |
1987 | * | |
1988 | * We check to make sure the array is valid by comparing the | |
1989 | * generation of the latest root in the array with the generation | |
1990 | * in the super block. If they don't match we pitch it. | |
1991 | */ | |
1992 | static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen) | |
1993 | { | |
1994 | u64 cur; | |
1995 | int newest_index = -1; | |
1996 | struct btrfs_root_backup *root_backup; | |
1997 | int i; | |
1998 | ||
1999 | for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) { | |
2000 | root_backup = info->super_copy->super_roots + i; | |
2001 | cur = btrfs_backup_tree_root_gen(root_backup); | |
2002 | if (cur == newest_gen) | |
2003 | newest_index = i; | |
2004 | } | |
2005 | ||
2006 | /* check to see if we actually wrapped around */ | |
2007 | if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) { | |
2008 | root_backup = info->super_copy->super_roots; | |
2009 | cur = btrfs_backup_tree_root_gen(root_backup); | |
2010 | if (cur == newest_gen) | |
2011 | newest_index = 0; | |
2012 | } | |
2013 | return newest_index; | |
2014 | } | |
2015 | ||
2016 | ||
2017 | /* | |
2018 | * find the oldest backup so we know where to store new entries | |
2019 | * in the backup array. This will set the backup_root_index | |
2020 | * field in the fs_info struct | |
2021 | */ | |
2022 | static void find_oldest_super_backup(struct btrfs_fs_info *info, | |
2023 | u64 newest_gen) | |
2024 | { | |
2025 | int newest_index = -1; | |
2026 | ||
2027 | newest_index = find_newest_super_backup(info, newest_gen); | |
2028 | /* if there was garbage in there, just move along */ | |
2029 | if (newest_index == -1) { | |
2030 | info->backup_root_index = 0; | |
2031 | } else { | |
2032 | info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS; | |
2033 | } | |
2034 | } | |
2035 | ||
2036 | /* | |
2037 | * copy all the root pointers into the super backup array. | |
2038 | * this will bump the backup pointer by one when it is | |
2039 | * done | |
2040 | */ | |
2041 | static void backup_super_roots(struct btrfs_fs_info *info) | |
2042 | { | |
2043 | int next_backup; | |
2044 | struct btrfs_root_backup *root_backup; | |
2045 | int last_backup; | |
2046 | ||
2047 | next_backup = info->backup_root_index; | |
2048 | last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) % | |
2049 | BTRFS_NUM_BACKUP_ROOTS; | |
2050 | ||
2051 | /* | |
2052 | * just overwrite the last backup if we're at the same generation | |
2053 | * this happens only at umount | |
2054 | */ | |
2055 | root_backup = info->super_for_commit->super_roots + last_backup; | |
2056 | if (btrfs_backup_tree_root_gen(root_backup) == | |
2057 | btrfs_header_generation(info->tree_root->node)) | |
2058 | next_backup = last_backup; | |
2059 | ||
2060 | root_backup = info->super_for_commit->super_roots + next_backup; | |
2061 | ||
2062 | /* | |
2063 | * make sure all of our padding and empty slots get zero filled | |
2064 | * regardless of which ones we use today | |
2065 | */ | |
2066 | memset(root_backup, 0, sizeof(*root_backup)); | |
2067 | ||
2068 | info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS; | |
2069 | ||
2070 | btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start); | |
2071 | btrfs_set_backup_tree_root_gen(root_backup, | |
2072 | btrfs_header_generation(info->tree_root->node)); | |
2073 | ||
2074 | btrfs_set_backup_tree_root_level(root_backup, | |
2075 | btrfs_header_level(info->tree_root->node)); | |
2076 | ||
2077 | btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start); | |
2078 | btrfs_set_backup_chunk_root_gen(root_backup, | |
2079 | btrfs_header_generation(info->chunk_root->node)); | |
2080 | btrfs_set_backup_chunk_root_level(root_backup, | |
2081 | btrfs_header_level(info->chunk_root->node)); | |
2082 | ||
2083 | btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start); | |
2084 | btrfs_set_backup_extent_root_gen(root_backup, | |
2085 | btrfs_header_generation(info->extent_root->node)); | |
2086 | btrfs_set_backup_extent_root_level(root_backup, | |
2087 | btrfs_header_level(info->extent_root->node)); | |
2088 | ||
2089 | /* | |
2090 | * we might commit during log recovery, which happens before we set | |
2091 | * the fs_root. Make sure it is valid before we fill it in. | |
2092 | */ | |
2093 | if (info->fs_root && info->fs_root->node) { | |
2094 | btrfs_set_backup_fs_root(root_backup, | |
2095 | info->fs_root->node->start); | |
2096 | btrfs_set_backup_fs_root_gen(root_backup, | |
2097 | btrfs_header_generation(info->fs_root->node)); | |
2098 | btrfs_set_backup_fs_root_level(root_backup, | |
2099 | btrfs_header_level(info->fs_root->node)); | |
2100 | } | |
2101 | ||
2102 | btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start); | |
2103 | btrfs_set_backup_dev_root_gen(root_backup, | |
2104 | btrfs_header_generation(info->dev_root->node)); | |
2105 | btrfs_set_backup_dev_root_level(root_backup, | |
2106 | btrfs_header_level(info->dev_root->node)); | |
2107 | ||
2108 | btrfs_set_backup_csum_root(root_backup, info->csum_root->node->start); | |
2109 | btrfs_set_backup_csum_root_gen(root_backup, | |
2110 | btrfs_header_generation(info->csum_root->node)); | |
2111 | btrfs_set_backup_csum_root_level(root_backup, | |
2112 | btrfs_header_level(info->csum_root->node)); | |
2113 | ||
2114 | btrfs_set_backup_total_bytes(root_backup, | |
2115 | btrfs_super_total_bytes(info->super_copy)); | |
2116 | btrfs_set_backup_bytes_used(root_backup, | |
2117 | btrfs_super_bytes_used(info->super_copy)); | |
2118 | btrfs_set_backup_num_devices(root_backup, | |
2119 | btrfs_super_num_devices(info->super_copy)); | |
2120 | ||
2121 | /* | |
2122 | * if we don't copy this out to the super_copy, it won't get remembered | |
2123 | * for the next commit | |
2124 | */ | |
2125 | memcpy(&info->super_copy->super_roots, | |
2126 | &info->super_for_commit->super_roots, | |
2127 | sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS); | |
2128 | } | |
2129 | ||
2130 | /* | |
2131 | * this copies info out of the root backup array and back into | |
2132 | * the in-memory super block. It is meant to help iterate through | |
2133 | * the array, so you send it the number of backups you've already | |
2134 | * tried and the last backup index you used. | |
2135 | * | |
2136 | * this returns -1 when it has tried all the backups | |
2137 | */ | |
2138 | static noinline int next_root_backup(struct btrfs_fs_info *info, | |
2139 | struct btrfs_super_block *super, | |
2140 | int *num_backups_tried, int *backup_index) | |
2141 | { | |
2142 | struct btrfs_root_backup *root_backup; | |
2143 | int newest = *backup_index; | |
2144 | ||
2145 | if (*num_backups_tried == 0) { | |
2146 | u64 gen = btrfs_super_generation(super); | |
2147 | ||
2148 | newest = find_newest_super_backup(info, gen); | |
2149 | if (newest == -1) | |
2150 | return -1; | |
2151 | ||
2152 | *backup_index = newest; | |
2153 | *num_backups_tried = 1; | |
2154 | } else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) { | |
2155 | /* we've tried all the backups, all done */ | |
2156 | return -1; | |
2157 | } else { | |
2158 | /* jump to the next oldest backup */ | |
2159 | newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) % | |
2160 | BTRFS_NUM_BACKUP_ROOTS; | |
2161 | *backup_index = newest; | |
2162 | *num_backups_tried += 1; | |
2163 | } | |
2164 | root_backup = super->super_roots + newest; | |
2165 | ||
2166 | btrfs_set_super_generation(super, | |
2167 | btrfs_backup_tree_root_gen(root_backup)); | |
2168 | btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup)); | |
2169 | btrfs_set_super_root_level(super, | |
2170 | btrfs_backup_tree_root_level(root_backup)); | |
2171 | btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup)); | |
2172 | ||
2173 | /* | |
2174 | * fixme: the total bytes and num_devices need to match or we should | |
2175 | * need a fsck | |
2176 | */ | |
2177 | btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup)); | |
2178 | btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup)); | |
2179 | return 0; | |
2180 | } | |
2181 | ||
2182 | /* helper to cleanup workers */ | |
2183 | static void btrfs_stop_all_workers(struct btrfs_fs_info *fs_info) | |
2184 | { | |
2185 | btrfs_destroy_workqueue(fs_info->fixup_workers); | |
2186 | btrfs_destroy_workqueue(fs_info->delalloc_workers); | |
2187 | btrfs_destroy_workqueue(fs_info->workers); | |
2188 | btrfs_destroy_workqueue(fs_info->endio_workers); | |
2189 | btrfs_destroy_workqueue(fs_info->endio_meta_workers); | |
2190 | btrfs_destroy_workqueue(fs_info->endio_raid56_workers); | |
2191 | btrfs_destroy_workqueue(fs_info->endio_repair_workers); | |
2192 | btrfs_destroy_workqueue(fs_info->rmw_workers); | |
2193 | btrfs_destroy_workqueue(fs_info->endio_meta_write_workers); | |
2194 | btrfs_destroy_workqueue(fs_info->endio_write_workers); | |
2195 | btrfs_destroy_workqueue(fs_info->endio_freespace_worker); | |
2196 | btrfs_destroy_workqueue(fs_info->submit_workers); | |
2197 | btrfs_destroy_workqueue(fs_info->delayed_workers); | |
2198 | btrfs_destroy_workqueue(fs_info->caching_workers); | |
2199 | btrfs_destroy_workqueue(fs_info->readahead_workers); | |
2200 | btrfs_destroy_workqueue(fs_info->flush_workers); | |
2201 | btrfs_destroy_workqueue(fs_info->qgroup_rescan_workers); | |
2202 | btrfs_destroy_workqueue(fs_info->extent_workers); | |
2203 | } | |
2204 | ||
2205 | static void free_root_extent_buffers(struct btrfs_root *root) | |
2206 | { | |
2207 | if (root) { | |
2208 | free_extent_buffer(root->node); | |
2209 | free_extent_buffer(root->commit_root); | |
2210 | root->node = NULL; | |
2211 | root->commit_root = NULL; | |
2212 | } | |
2213 | } | |
2214 | ||
2215 | /* helper to cleanup tree roots */ | |
2216 | static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root) | |
2217 | { | |
2218 | free_root_extent_buffers(info->tree_root); | |
2219 | ||
2220 | free_root_extent_buffers(info->dev_root); | |
2221 | free_root_extent_buffers(info->extent_root); | |
2222 | free_root_extent_buffers(info->csum_root); | |
2223 | free_root_extent_buffers(info->quota_root); | |
2224 | free_root_extent_buffers(info->uuid_root); | |
2225 | if (chunk_root) | |
2226 | free_root_extent_buffers(info->chunk_root); | |
2227 | free_root_extent_buffers(info->free_space_root); | |
2228 | } | |
2229 | ||
2230 | void btrfs_free_fs_roots(struct btrfs_fs_info *fs_info) | |
2231 | { | |
2232 | int ret; | |
2233 | struct btrfs_root *gang[8]; | |
2234 | int i; | |
2235 | ||
2236 | while (!list_empty(&fs_info->dead_roots)) { | |
2237 | gang[0] = list_entry(fs_info->dead_roots.next, | |
2238 | struct btrfs_root, root_list); | |
2239 | list_del(&gang[0]->root_list); | |
2240 | ||
2241 | if (test_bit(BTRFS_ROOT_IN_RADIX, &gang[0]->state)) { | |
2242 | btrfs_drop_and_free_fs_root(fs_info, gang[0]); | |
2243 | } else { | |
2244 | free_extent_buffer(gang[0]->node); | |
2245 | free_extent_buffer(gang[0]->commit_root); | |
2246 | btrfs_put_fs_root(gang[0]); | |
2247 | } | |
2248 | } | |
2249 | ||
2250 | while (1) { | |
2251 | ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, | |
2252 | (void **)gang, 0, | |
2253 | ARRAY_SIZE(gang)); | |
2254 | if (!ret) | |
2255 | break; | |
2256 | for (i = 0; i < ret; i++) | |
2257 | btrfs_drop_and_free_fs_root(fs_info, gang[i]); | |
2258 | } | |
2259 | ||
2260 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { | |
2261 | btrfs_free_log_root_tree(NULL, fs_info); | |
2262 | btrfs_destroy_pinned_extent(fs_info->tree_root, | |
2263 | fs_info->pinned_extents); | |
2264 | } | |
2265 | } | |
2266 | ||
2267 | static void btrfs_init_scrub(struct btrfs_fs_info *fs_info) | |
2268 | { | |
2269 | mutex_init(&fs_info->scrub_lock); | |
2270 | atomic_set(&fs_info->scrubs_running, 0); | |
2271 | atomic_set(&fs_info->scrub_pause_req, 0); | |
2272 | atomic_set(&fs_info->scrubs_paused, 0); | |
2273 | atomic_set(&fs_info->scrub_cancel_req, 0); | |
2274 | init_waitqueue_head(&fs_info->scrub_pause_wait); | |
2275 | fs_info->scrub_workers_refcnt = 0; | |
2276 | } | |
2277 | ||
2278 | static void btrfs_init_balance(struct btrfs_fs_info *fs_info) | |
2279 | { | |
2280 | spin_lock_init(&fs_info->balance_lock); | |
2281 | mutex_init(&fs_info->balance_mutex); | |
2282 | atomic_set(&fs_info->balance_running, 0); | |
2283 | atomic_set(&fs_info->balance_pause_req, 0); | |
2284 | atomic_set(&fs_info->balance_cancel_req, 0); | |
2285 | fs_info->balance_ctl = NULL; | |
2286 | init_waitqueue_head(&fs_info->balance_wait_q); | |
2287 | } | |
2288 | ||
2289 | static void btrfs_init_btree_inode(struct btrfs_fs_info *fs_info) | |
2290 | { | |
2291 | fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID; | |
2292 | set_nlink(fs_info->btree_inode, 1); | |
2293 | /* | |
2294 | * we set the i_size on the btree inode to the max possible int. | |
2295 | * the real end of the address space is determined by all of | |
2296 | * the devices in the system | |
2297 | */ | |
2298 | fs_info->btree_inode->i_size = OFFSET_MAX; | |
2299 | fs_info->btree_inode->i_mapping->a_ops = &btree_aops; | |
2300 | ||
2301 | RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node); | |
2302 | extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, | |
2303 | fs_info->btree_inode->i_mapping); | |
2304 | BTRFS_I(fs_info->btree_inode)->io_tree.track_uptodate = 0; | |
2305 | extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree); | |
2306 | ||
2307 | BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; | |
2308 | ||
2309 | BTRFS_I(fs_info->btree_inode)->root = fs_info->tree_root; | |
2310 | memset(&BTRFS_I(fs_info->btree_inode)->location, 0, | |
2311 | sizeof(struct btrfs_key)); | |
2312 | set_bit(BTRFS_INODE_DUMMY, | |
2313 | &BTRFS_I(fs_info->btree_inode)->runtime_flags); | |
2314 | btrfs_insert_inode_hash(fs_info->btree_inode); | |
2315 | } | |
2316 | ||
2317 | static void btrfs_init_dev_replace_locks(struct btrfs_fs_info *fs_info) | |
2318 | { | |
2319 | fs_info->dev_replace.lock_owner = 0; | |
2320 | atomic_set(&fs_info->dev_replace.nesting_level, 0); | |
2321 | mutex_init(&fs_info->dev_replace.lock_finishing_cancel_unmount); | |
2322 | rwlock_init(&fs_info->dev_replace.lock); | |
2323 | atomic_set(&fs_info->dev_replace.read_locks, 0); | |
2324 | atomic_set(&fs_info->dev_replace.blocking_readers, 0); | |
2325 | init_waitqueue_head(&fs_info->replace_wait); | |
2326 | init_waitqueue_head(&fs_info->dev_replace.read_lock_wq); | |
2327 | } | |
2328 | ||
2329 | static void btrfs_init_qgroup(struct btrfs_fs_info *fs_info) | |
2330 | { | |
2331 | spin_lock_init(&fs_info->qgroup_lock); | |
2332 | mutex_init(&fs_info->qgroup_ioctl_lock); | |
2333 | fs_info->qgroup_tree = RB_ROOT; | |
2334 | fs_info->qgroup_op_tree = RB_ROOT; | |
2335 | INIT_LIST_HEAD(&fs_info->dirty_qgroups); | |
2336 | fs_info->qgroup_seq = 1; | |
2337 | fs_info->qgroup_ulist = NULL; | |
2338 | fs_info->qgroup_rescan_running = false; | |
2339 | mutex_init(&fs_info->qgroup_rescan_lock); | |
2340 | } | |
2341 | ||
2342 | static int btrfs_init_workqueues(struct btrfs_fs_info *fs_info, | |
2343 | struct btrfs_fs_devices *fs_devices) | |
2344 | { | |
2345 | int max_active = fs_info->thread_pool_size; | |
2346 | unsigned int flags = WQ_MEM_RECLAIM | WQ_FREEZABLE | WQ_UNBOUND; | |
2347 | ||
2348 | fs_info->workers = | |
2349 | btrfs_alloc_workqueue(fs_info, "worker", | |
2350 | flags | WQ_HIGHPRI, max_active, 16); | |
2351 | ||
2352 | fs_info->delalloc_workers = | |
2353 | btrfs_alloc_workqueue(fs_info, "delalloc", | |
2354 | flags, max_active, 2); | |
2355 | ||
2356 | fs_info->flush_workers = | |
2357 | btrfs_alloc_workqueue(fs_info, "flush_delalloc", | |
2358 | flags, max_active, 0); | |
2359 | ||
2360 | fs_info->caching_workers = | |
2361 | btrfs_alloc_workqueue(fs_info, "cache", flags, max_active, 0); | |
2362 | ||
2363 | /* | |
2364 | * a higher idle thresh on the submit workers makes it much more | |
2365 | * likely that bios will be send down in a sane order to the | |
2366 | * devices | |
2367 | */ | |
2368 | fs_info->submit_workers = | |
2369 | btrfs_alloc_workqueue(fs_info, "submit", flags, | |
2370 | min_t(u64, fs_devices->num_devices, | |
2371 | max_active), 64); | |
2372 | ||
2373 | fs_info->fixup_workers = | |
2374 | btrfs_alloc_workqueue(fs_info, "fixup", flags, 1, 0); | |
2375 | ||
2376 | /* | |
2377 | * endios are largely parallel and should have a very | |
2378 | * low idle thresh | |
2379 | */ | |
2380 | fs_info->endio_workers = | |
2381 | btrfs_alloc_workqueue(fs_info, "endio", flags, max_active, 4); | |
2382 | fs_info->endio_meta_workers = | |
2383 | btrfs_alloc_workqueue(fs_info, "endio-meta", flags, | |
2384 | max_active, 4); | |
2385 | fs_info->endio_meta_write_workers = | |
2386 | btrfs_alloc_workqueue(fs_info, "endio-meta-write", flags, | |
2387 | max_active, 2); | |
2388 | fs_info->endio_raid56_workers = | |
2389 | btrfs_alloc_workqueue(fs_info, "endio-raid56", flags, | |
2390 | max_active, 4); | |
2391 | fs_info->endio_repair_workers = | |
2392 | btrfs_alloc_workqueue(fs_info, "endio-repair", flags, 1, 0); | |
2393 | fs_info->rmw_workers = | |
2394 | btrfs_alloc_workqueue(fs_info, "rmw", flags, max_active, 2); | |
2395 | fs_info->endio_write_workers = | |
2396 | btrfs_alloc_workqueue(fs_info, "endio-write", flags, | |
2397 | max_active, 2); | |
2398 | fs_info->endio_freespace_worker = | |
2399 | btrfs_alloc_workqueue(fs_info, "freespace-write", flags, | |
2400 | max_active, 0); | |
2401 | fs_info->delayed_workers = | |
2402 | btrfs_alloc_workqueue(fs_info, "delayed-meta", flags, | |
2403 | max_active, 0); | |
2404 | fs_info->readahead_workers = | |
2405 | btrfs_alloc_workqueue(fs_info, "readahead", flags, | |
2406 | max_active, 2); | |
2407 | fs_info->qgroup_rescan_workers = | |
2408 | btrfs_alloc_workqueue(fs_info, "qgroup-rescan", flags, 1, 0); | |
2409 | fs_info->extent_workers = | |
2410 | btrfs_alloc_workqueue(fs_info, "extent-refs", flags, | |
2411 | min_t(u64, fs_devices->num_devices, | |
2412 | max_active), 8); | |
2413 | ||
2414 | if (!(fs_info->workers && fs_info->delalloc_workers && | |
2415 | fs_info->submit_workers && fs_info->flush_workers && | |
2416 | fs_info->endio_workers && fs_info->endio_meta_workers && | |
2417 | fs_info->endio_meta_write_workers && | |
2418 | fs_info->endio_repair_workers && | |
2419 | fs_info->endio_write_workers && fs_info->endio_raid56_workers && | |
2420 | fs_info->endio_freespace_worker && fs_info->rmw_workers && | |
2421 | fs_info->caching_workers && fs_info->readahead_workers && | |
2422 | fs_info->fixup_workers && fs_info->delayed_workers && | |
2423 | fs_info->extent_workers && | |
2424 | fs_info->qgroup_rescan_workers)) { | |
2425 | return -ENOMEM; | |
2426 | } | |
2427 | ||
2428 | return 0; | |
2429 | } | |
2430 | ||
2431 | static int btrfs_replay_log(struct btrfs_fs_info *fs_info, | |
2432 | struct btrfs_fs_devices *fs_devices) | |
2433 | { | |
2434 | int ret; | |
2435 | struct btrfs_root *tree_root = fs_info->tree_root; | |
2436 | struct btrfs_root *log_tree_root; | |
2437 | struct btrfs_super_block *disk_super = fs_info->super_copy; | |
2438 | u64 bytenr = btrfs_super_log_root(disk_super); | |
2439 | ||
2440 | if (fs_devices->rw_devices == 0) { | |
2441 | btrfs_warn(fs_info, "log replay required on RO media"); | |
2442 | return -EIO; | |
2443 | } | |
2444 | ||
2445 | log_tree_root = btrfs_alloc_root(fs_info, GFP_KERNEL); | |
2446 | if (!log_tree_root) | |
2447 | return -ENOMEM; | |
2448 | ||
2449 | __setup_root(log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID); | |
2450 | ||
2451 | log_tree_root->node = read_tree_block(tree_root, bytenr, | |
2452 | fs_info->generation + 1); | |
2453 | if (IS_ERR(log_tree_root->node)) { | |
2454 | btrfs_warn(fs_info, "failed to read log tree"); | |
2455 | ret = PTR_ERR(log_tree_root->node); | |
2456 | kfree(log_tree_root); | |
2457 | return ret; | |
2458 | } else if (!extent_buffer_uptodate(log_tree_root->node)) { | |
2459 | btrfs_err(fs_info, "failed to read log tree"); | |
2460 | free_extent_buffer(log_tree_root->node); | |
2461 | kfree(log_tree_root); | |
2462 | return -EIO; | |
2463 | } | |
2464 | /* returns with log_tree_root freed on success */ | |
2465 | ret = btrfs_recover_log_trees(log_tree_root); | |
2466 | if (ret) { | |
2467 | btrfs_handle_fs_error(tree_root->fs_info, ret, | |
2468 | "Failed to recover log tree"); | |
2469 | free_extent_buffer(log_tree_root->node); | |
2470 | kfree(log_tree_root); | |
2471 | return ret; | |
2472 | } | |
2473 | ||
2474 | if (fs_info->sb->s_flags & MS_RDONLY) { | |
2475 | ret = btrfs_commit_super(fs_info); | |
2476 | if (ret) | |
2477 | return ret; | |
2478 | } | |
2479 | ||
2480 | return 0; | |
2481 | } | |
2482 | ||
2483 | static int btrfs_read_roots(struct btrfs_fs_info *fs_info) | |
2484 | { | |
2485 | struct btrfs_root *tree_root = fs_info->tree_root; | |
2486 | struct btrfs_root *root; | |
2487 | struct btrfs_key location; | |
2488 | int ret; | |
2489 | ||
2490 | BUG_ON(!fs_info->tree_root); | |
2491 | ||
2492 | location.objectid = BTRFS_EXTENT_TREE_OBJECTID; | |
2493 | location.type = BTRFS_ROOT_ITEM_KEY; | |
2494 | location.offset = 0; | |
2495 | ||
2496 | root = btrfs_read_tree_root(tree_root, &location); | |
2497 | if (IS_ERR(root)) | |
2498 | return PTR_ERR(root); | |
2499 | set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); | |
2500 | fs_info->extent_root = root; | |
2501 | ||
2502 | location.objectid = BTRFS_DEV_TREE_OBJECTID; | |
2503 | root = btrfs_read_tree_root(tree_root, &location); | |
2504 | if (IS_ERR(root)) | |
2505 | return PTR_ERR(root); | |
2506 | set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); | |
2507 | fs_info->dev_root = root; | |
2508 | btrfs_init_devices_late(fs_info); | |
2509 | ||
2510 | location.objectid = BTRFS_CSUM_TREE_OBJECTID; | |
2511 | root = btrfs_read_tree_root(tree_root, &location); | |
2512 | if (IS_ERR(root)) | |
2513 | return PTR_ERR(root); | |
2514 | set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); | |
2515 | fs_info->csum_root = root; | |
2516 | ||
2517 | location.objectid = BTRFS_QUOTA_TREE_OBJECTID; | |
2518 | root = btrfs_read_tree_root(tree_root, &location); | |
2519 | if (!IS_ERR(root)) { | |
2520 | set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); | |
2521 | set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags); | |
2522 | fs_info->quota_root = root; | |
2523 | } | |
2524 | ||
2525 | location.objectid = BTRFS_UUID_TREE_OBJECTID; | |
2526 | root = btrfs_read_tree_root(tree_root, &location); | |
2527 | if (IS_ERR(root)) { | |
2528 | ret = PTR_ERR(root); | |
2529 | if (ret != -ENOENT) | |
2530 | return ret; | |
2531 | } else { | |
2532 | set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); | |
2533 | fs_info->uuid_root = root; | |
2534 | } | |
2535 | ||
2536 | if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { | |
2537 | location.objectid = BTRFS_FREE_SPACE_TREE_OBJECTID; | |
2538 | root = btrfs_read_tree_root(tree_root, &location); | |
2539 | if (IS_ERR(root)) | |
2540 | return PTR_ERR(root); | |
2541 | set_bit(BTRFS_ROOT_TRACK_DIRTY, &root->state); | |
2542 | fs_info->free_space_root = root; | |
2543 | } | |
2544 | ||
2545 | return 0; | |
2546 | } | |
2547 | ||
2548 | int open_ctree(struct super_block *sb, | |
2549 | struct btrfs_fs_devices *fs_devices, | |
2550 | char *options) | |
2551 | { | |
2552 | u32 sectorsize; | |
2553 | u32 nodesize; | |
2554 | u32 stripesize; | |
2555 | u64 generation; | |
2556 | u64 features; | |
2557 | struct btrfs_key location; | |
2558 | struct buffer_head *bh; | |
2559 | struct btrfs_super_block *disk_super; | |
2560 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); | |
2561 | struct btrfs_root *tree_root; | |
2562 | struct btrfs_root *chunk_root; | |
2563 | int ret; | |
2564 | int err = -EINVAL; | |
2565 | int num_backups_tried = 0; | |
2566 | int backup_index = 0; | |
2567 | int max_active; | |
2568 | int clear_free_space_tree = 0; | |
2569 | ||
2570 | tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info, GFP_KERNEL); | |
2571 | chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info, GFP_KERNEL); | |
2572 | if (!tree_root || !chunk_root) { | |
2573 | err = -ENOMEM; | |
2574 | goto fail; | |
2575 | } | |
2576 | ||
2577 | ret = init_srcu_struct(&fs_info->subvol_srcu); | |
2578 | if (ret) { | |
2579 | err = ret; | |
2580 | goto fail; | |
2581 | } | |
2582 | ||
2583 | ret = setup_bdi(fs_info, &fs_info->bdi); | |
2584 | if (ret) { | |
2585 | err = ret; | |
2586 | goto fail_srcu; | |
2587 | } | |
2588 | ||
2589 | ret = percpu_counter_init(&fs_info->dirty_metadata_bytes, 0, GFP_KERNEL); | |
2590 | if (ret) { | |
2591 | err = ret; | |
2592 | goto fail_bdi; | |
2593 | } | |
2594 | fs_info->dirty_metadata_batch = PAGE_SIZE * | |
2595 | (1 + ilog2(nr_cpu_ids)); | |
2596 | ||
2597 | ret = percpu_counter_init(&fs_info->delalloc_bytes, 0, GFP_KERNEL); | |
2598 | if (ret) { | |
2599 | err = ret; | |
2600 | goto fail_dirty_metadata_bytes; | |
2601 | } | |
2602 | ||
2603 | ret = percpu_counter_init(&fs_info->bio_counter, 0, GFP_KERNEL); | |
2604 | if (ret) { | |
2605 | err = ret; | |
2606 | goto fail_delalloc_bytes; | |
2607 | } | |
2608 | ||
2609 | fs_info->btree_inode = new_inode(sb); | |
2610 | if (!fs_info->btree_inode) { | |
2611 | err = -ENOMEM; | |
2612 | goto fail_bio_counter; | |
2613 | } | |
2614 | ||
2615 | mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); | |
2616 | ||
2617 | INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); | |
2618 | INIT_RADIX_TREE(&fs_info->buffer_radix, GFP_ATOMIC); | |
2619 | INIT_LIST_HEAD(&fs_info->trans_list); | |
2620 | INIT_LIST_HEAD(&fs_info->dead_roots); | |
2621 | INIT_LIST_HEAD(&fs_info->delayed_iputs); | |
2622 | INIT_LIST_HEAD(&fs_info->delalloc_roots); | |
2623 | INIT_LIST_HEAD(&fs_info->caching_block_groups); | |
2624 | spin_lock_init(&fs_info->delalloc_root_lock); | |
2625 | spin_lock_init(&fs_info->trans_lock); | |
2626 | spin_lock_init(&fs_info->fs_roots_radix_lock); | |
2627 | spin_lock_init(&fs_info->delayed_iput_lock); | |
2628 | spin_lock_init(&fs_info->defrag_inodes_lock); | |
2629 | spin_lock_init(&fs_info->free_chunk_lock); | |
2630 | spin_lock_init(&fs_info->tree_mod_seq_lock); | |
2631 | spin_lock_init(&fs_info->super_lock); | |
2632 | spin_lock_init(&fs_info->qgroup_op_lock); | |
2633 | spin_lock_init(&fs_info->buffer_lock); | |
2634 | spin_lock_init(&fs_info->unused_bgs_lock); | |
2635 | rwlock_init(&fs_info->tree_mod_log_lock); | |
2636 | mutex_init(&fs_info->unused_bg_unpin_mutex); | |
2637 | mutex_init(&fs_info->delete_unused_bgs_mutex); | |
2638 | mutex_init(&fs_info->reloc_mutex); | |
2639 | mutex_init(&fs_info->delalloc_root_mutex); | |
2640 | mutex_init(&fs_info->cleaner_delayed_iput_mutex); | |
2641 | seqlock_init(&fs_info->profiles_lock); | |
2642 | ||
2643 | INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); | |
2644 | INIT_LIST_HEAD(&fs_info->space_info); | |
2645 | INIT_LIST_HEAD(&fs_info->tree_mod_seq_list); | |
2646 | INIT_LIST_HEAD(&fs_info->unused_bgs); | |
2647 | btrfs_mapping_init(&fs_info->mapping_tree); | |
2648 | btrfs_init_block_rsv(&fs_info->global_block_rsv, | |
2649 | BTRFS_BLOCK_RSV_GLOBAL); | |
2650 | btrfs_init_block_rsv(&fs_info->delalloc_block_rsv, | |
2651 | BTRFS_BLOCK_RSV_DELALLOC); | |
2652 | btrfs_init_block_rsv(&fs_info->trans_block_rsv, BTRFS_BLOCK_RSV_TRANS); | |
2653 | btrfs_init_block_rsv(&fs_info->chunk_block_rsv, BTRFS_BLOCK_RSV_CHUNK); | |
2654 | btrfs_init_block_rsv(&fs_info->empty_block_rsv, BTRFS_BLOCK_RSV_EMPTY); | |
2655 | btrfs_init_block_rsv(&fs_info->delayed_block_rsv, | |
2656 | BTRFS_BLOCK_RSV_DELOPS); | |
2657 | atomic_set(&fs_info->nr_async_submits, 0); | |
2658 | atomic_set(&fs_info->async_delalloc_pages, 0); | |
2659 | atomic_set(&fs_info->async_submit_draining, 0); | |
2660 | atomic_set(&fs_info->nr_async_bios, 0); | |
2661 | atomic_set(&fs_info->defrag_running, 0); | |
2662 | atomic_set(&fs_info->qgroup_op_seq, 0); | |
2663 | atomic_set(&fs_info->reada_works_cnt, 0); | |
2664 | atomic64_set(&fs_info->tree_mod_seq, 0); | |
2665 | fs_info->fs_frozen = 0; | |
2666 | fs_info->sb = sb; | |
2667 | fs_info->max_inline = BTRFS_DEFAULT_MAX_INLINE; | |
2668 | fs_info->metadata_ratio = 0; | |
2669 | fs_info->defrag_inodes = RB_ROOT; | |
2670 | fs_info->free_chunk_space = 0; | |
2671 | fs_info->tree_mod_log = RB_ROOT; | |
2672 | fs_info->commit_interval = BTRFS_DEFAULT_COMMIT_INTERVAL; | |
2673 | fs_info->avg_delayed_ref_runtime = NSEC_PER_SEC >> 6; /* div by 64 */ | |
2674 | /* readahead state */ | |
2675 | INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_DIRECT_RECLAIM); | |
2676 | spin_lock_init(&fs_info->reada_lock); | |
2677 | ||
2678 | fs_info->thread_pool_size = min_t(unsigned long, | |
2679 | num_online_cpus() + 2, 8); | |
2680 | ||
2681 | INIT_LIST_HEAD(&fs_info->ordered_roots); | |
2682 | spin_lock_init(&fs_info->ordered_root_lock); | |
2683 | fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root), | |
2684 | GFP_KERNEL); | |
2685 | if (!fs_info->delayed_root) { | |
2686 | err = -ENOMEM; | |
2687 | goto fail_iput; | |
2688 | } | |
2689 | btrfs_init_delayed_root(fs_info->delayed_root); | |
2690 | ||
2691 | btrfs_init_scrub(fs_info); | |
2692 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY | |
2693 | fs_info->check_integrity_print_mask = 0; | |
2694 | #endif | |
2695 | btrfs_init_balance(fs_info); | |
2696 | btrfs_init_async_reclaim_work(&fs_info->async_reclaim_work); | |
2697 | ||
2698 | sb->s_blocksize = 4096; | |
2699 | sb->s_blocksize_bits = blksize_bits(4096); | |
2700 | sb->s_bdi = &fs_info->bdi; | |
2701 | ||
2702 | btrfs_init_btree_inode(fs_info); | |
2703 | ||
2704 | spin_lock_init(&fs_info->block_group_cache_lock); | |
2705 | fs_info->block_group_cache_tree = RB_ROOT; | |
2706 | fs_info->first_logical_byte = (u64)-1; | |
2707 | ||
2708 | extent_io_tree_init(&fs_info->freed_extents[0], | |
2709 | fs_info->btree_inode->i_mapping); | |
2710 | extent_io_tree_init(&fs_info->freed_extents[1], | |
2711 | fs_info->btree_inode->i_mapping); | |
2712 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
2713 | set_bit(BTRFS_FS_BARRIER, &fs_info->flags); | |
2714 | ||
2715 | mutex_init(&fs_info->ordered_operations_mutex); | |
2716 | mutex_init(&fs_info->tree_log_mutex); | |
2717 | mutex_init(&fs_info->chunk_mutex); | |
2718 | mutex_init(&fs_info->transaction_kthread_mutex); | |
2719 | mutex_init(&fs_info->cleaner_mutex); | |
2720 | mutex_init(&fs_info->volume_mutex); | |
2721 | mutex_init(&fs_info->ro_block_group_mutex); | |
2722 | init_rwsem(&fs_info->commit_root_sem); | |
2723 | init_rwsem(&fs_info->cleanup_work_sem); | |
2724 | init_rwsem(&fs_info->subvol_sem); | |
2725 | sema_init(&fs_info->uuid_tree_rescan_sem, 1); | |
2726 | ||
2727 | btrfs_init_dev_replace_locks(fs_info); | |
2728 | btrfs_init_qgroup(fs_info); | |
2729 | ||
2730 | btrfs_init_free_cluster(&fs_info->meta_alloc_cluster); | |
2731 | btrfs_init_free_cluster(&fs_info->data_alloc_cluster); | |
2732 | ||
2733 | init_waitqueue_head(&fs_info->transaction_throttle); | |
2734 | init_waitqueue_head(&fs_info->transaction_wait); | |
2735 | init_waitqueue_head(&fs_info->transaction_blocked_wait); | |
2736 | init_waitqueue_head(&fs_info->async_submit_wait); | |
2737 | ||
2738 | INIT_LIST_HEAD(&fs_info->pinned_chunks); | |
2739 | ||
2740 | /* Usable values until the real ones are cached from the superblock */ | |
2741 | fs_info->nodesize = 4096; | |
2742 | fs_info->sectorsize = 4096; | |
2743 | fs_info->stripesize = 4096; | |
2744 | ||
2745 | ret = btrfs_alloc_stripe_hash_table(fs_info); | |
2746 | if (ret) { | |
2747 | err = ret; | |
2748 | goto fail_alloc; | |
2749 | } | |
2750 | ||
2751 | __setup_root(tree_root, fs_info, BTRFS_ROOT_TREE_OBJECTID); | |
2752 | ||
2753 | invalidate_bdev(fs_devices->latest_bdev); | |
2754 | ||
2755 | /* | |
2756 | * Read super block and check the signature bytes only | |
2757 | */ | |
2758 | bh = btrfs_read_dev_super(fs_devices->latest_bdev); | |
2759 | if (IS_ERR(bh)) { | |
2760 | err = PTR_ERR(bh); | |
2761 | goto fail_alloc; | |
2762 | } | |
2763 | ||
2764 | /* | |
2765 | * We want to check superblock checksum, the type is stored inside. | |
2766 | * Pass the whole disk block of size BTRFS_SUPER_INFO_SIZE (4k). | |
2767 | */ | |
2768 | if (btrfs_check_super_csum(fs_info, bh->b_data)) { | |
2769 | btrfs_err(fs_info, "superblock checksum mismatch"); | |
2770 | err = -EINVAL; | |
2771 | brelse(bh); | |
2772 | goto fail_alloc; | |
2773 | } | |
2774 | ||
2775 | /* | |
2776 | * super_copy is zeroed at allocation time and we never touch the | |
2777 | * following bytes up to INFO_SIZE, the checksum is calculated from | |
2778 | * the whole block of INFO_SIZE | |
2779 | */ | |
2780 | memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy)); | |
2781 | memcpy(fs_info->super_for_commit, fs_info->super_copy, | |
2782 | sizeof(*fs_info->super_for_commit)); | |
2783 | brelse(bh); | |
2784 | ||
2785 | memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE); | |
2786 | ||
2787 | ret = btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY); | |
2788 | if (ret) { | |
2789 | btrfs_err(fs_info, "superblock contains fatal errors"); | |
2790 | err = -EINVAL; | |
2791 | goto fail_alloc; | |
2792 | } | |
2793 | ||
2794 | disk_super = fs_info->super_copy; | |
2795 | if (!btrfs_super_root(disk_super)) | |
2796 | goto fail_alloc; | |
2797 | ||
2798 | /* check FS state, whether FS is broken. */ | |
2799 | if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_ERROR) | |
2800 | set_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state); | |
2801 | ||
2802 | /* | |
2803 | * run through our array of backup supers and setup | |
2804 | * our ring pointer to the oldest one | |
2805 | */ | |
2806 | generation = btrfs_super_generation(disk_super); | |
2807 | find_oldest_super_backup(fs_info, generation); | |
2808 | ||
2809 | /* | |
2810 | * In the long term, we'll store the compression type in the super | |
2811 | * block, and it'll be used for per file compression control. | |
2812 | */ | |
2813 | fs_info->compress_type = BTRFS_COMPRESS_ZLIB; | |
2814 | ||
2815 | ret = btrfs_parse_options(tree_root, options, sb->s_flags); | |
2816 | if (ret) { | |
2817 | err = ret; | |
2818 | goto fail_alloc; | |
2819 | } | |
2820 | ||
2821 | features = btrfs_super_incompat_flags(disk_super) & | |
2822 | ~BTRFS_FEATURE_INCOMPAT_SUPP; | |
2823 | if (features) { | |
2824 | btrfs_err(fs_info, | |
2825 | "cannot mount because of unsupported optional features (%llx)", | |
2826 | features); | |
2827 | err = -EINVAL; | |
2828 | goto fail_alloc; | |
2829 | } | |
2830 | ||
2831 | features = btrfs_super_incompat_flags(disk_super); | |
2832 | features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; | |
2833 | if (tree_root->fs_info->compress_type == BTRFS_COMPRESS_LZO) | |
2834 | features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; | |
2835 | ||
2836 | if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA) | |
2837 | btrfs_info(fs_info, "has skinny extents"); | |
2838 | ||
2839 | /* | |
2840 | * flag our filesystem as having big metadata blocks if | |
2841 | * they are bigger than the page size | |
2842 | */ | |
2843 | if (btrfs_super_nodesize(disk_super) > PAGE_SIZE) { | |
2844 | if (!(features & BTRFS_FEATURE_INCOMPAT_BIG_METADATA)) | |
2845 | btrfs_info(fs_info, | |
2846 | "flagging fs with big metadata feature"); | |
2847 | features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA; | |
2848 | } | |
2849 | ||
2850 | nodesize = btrfs_super_nodesize(disk_super); | |
2851 | sectorsize = btrfs_super_sectorsize(disk_super); | |
2852 | stripesize = sectorsize; | |
2853 | fs_info->dirty_metadata_batch = nodesize * (1 + ilog2(nr_cpu_ids)); | |
2854 | fs_info->delalloc_batch = sectorsize * 512 * (1 + ilog2(nr_cpu_ids)); | |
2855 | ||
2856 | /* Cache block sizes */ | |
2857 | fs_info->nodesize = nodesize; | |
2858 | fs_info->sectorsize = sectorsize; | |
2859 | fs_info->stripesize = stripesize; | |
2860 | ||
2861 | /* | |
2862 | * mixed block groups end up with duplicate but slightly offset | |
2863 | * extent buffers for the same range. It leads to corruptions | |
2864 | */ | |
2865 | if ((features & BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS) && | |
2866 | (sectorsize != nodesize)) { | |
2867 | btrfs_err(fs_info, | |
2868 | "unequal nodesize/sectorsize (%u != %u) are not allowed for mixed block groups", | |
2869 | nodesize, sectorsize); | |
2870 | goto fail_alloc; | |
2871 | } | |
2872 | ||
2873 | /* | |
2874 | * Needn't use the lock because there is no other task which will | |
2875 | * update the flag. | |
2876 | */ | |
2877 | btrfs_set_super_incompat_flags(disk_super, features); | |
2878 | ||
2879 | features = btrfs_super_compat_ro_flags(disk_super) & | |
2880 | ~BTRFS_FEATURE_COMPAT_RO_SUPP; | |
2881 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
2882 | btrfs_err(fs_info, | |
2883 | "cannot mount read-write because of unsupported optional features (%llx)", | |
2884 | features); | |
2885 | err = -EINVAL; | |
2886 | goto fail_alloc; | |
2887 | } | |
2888 | ||
2889 | max_active = fs_info->thread_pool_size; | |
2890 | ||
2891 | ret = btrfs_init_workqueues(fs_info, fs_devices); | |
2892 | if (ret) { | |
2893 | err = ret; | |
2894 | goto fail_sb_buffer; | |
2895 | } | |
2896 | ||
2897 | fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); | |
2898 | fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, | |
2899 | SZ_4M / PAGE_SIZE); | |
2900 | ||
2901 | sb->s_blocksize = sectorsize; | |
2902 | sb->s_blocksize_bits = blksize_bits(sectorsize); | |
2903 | ||
2904 | mutex_lock(&fs_info->chunk_mutex); | |
2905 | ret = btrfs_read_sys_array(fs_info); | |
2906 | mutex_unlock(&fs_info->chunk_mutex); | |
2907 | if (ret) { | |
2908 | btrfs_err(fs_info, "failed to read the system array: %d", ret); | |
2909 | goto fail_sb_buffer; | |
2910 | } | |
2911 | ||
2912 | generation = btrfs_super_chunk_root_generation(disk_super); | |
2913 | ||
2914 | __setup_root(chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); | |
2915 | ||
2916 | chunk_root->node = read_tree_block(chunk_root, | |
2917 | btrfs_super_chunk_root(disk_super), | |
2918 | generation); | |
2919 | if (IS_ERR(chunk_root->node) || | |
2920 | !extent_buffer_uptodate(chunk_root->node)) { | |
2921 | btrfs_err(fs_info, "failed to read chunk root"); | |
2922 | if (!IS_ERR(chunk_root->node)) | |
2923 | free_extent_buffer(chunk_root->node); | |
2924 | chunk_root->node = NULL; | |
2925 | goto fail_tree_roots; | |
2926 | } | |
2927 | btrfs_set_root_node(&chunk_root->root_item, chunk_root->node); | |
2928 | chunk_root->commit_root = btrfs_root_node(chunk_root); | |
2929 | ||
2930 | read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, | |
2931 | btrfs_header_chunk_tree_uuid(chunk_root->node), BTRFS_UUID_SIZE); | |
2932 | ||
2933 | ret = btrfs_read_chunk_tree(fs_info); | |
2934 | if (ret) { | |
2935 | btrfs_err(fs_info, "failed to read chunk tree: %d", ret); | |
2936 | goto fail_tree_roots; | |
2937 | } | |
2938 | ||
2939 | /* | |
2940 | * keep the device that is marked to be the target device for the | |
2941 | * dev_replace procedure | |
2942 | */ | |
2943 | btrfs_close_extra_devices(fs_devices, 0); | |
2944 | ||
2945 | if (!fs_devices->latest_bdev) { | |
2946 | btrfs_err(fs_info, "failed to read devices"); | |
2947 | goto fail_tree_roots; | |
2948 | } | |
2949 | ||
2950 | retry_root_backup: | |
2951 | generation = btrfs_super_generation(disk_super); | |
2952 | ||
2953 | tree_root->node = read_tree_block(tree_root, | |
2954 | btrfs_super_root(disk_super), | |
2955 | generation); | |
2956 | if (IS_ERR(tree_root->node) || | |
2957 | !extent_buffer_uptodate(tree_root->node)) { | |
2958 | btrfs_warn(fs_info, "failed to read tree root"); | |
2959 | if (!IS_ERR(tree_root->node)) | |
2960 | free_extent_buffer(tree_root->node); | |
2961 | tree_root->node = NULL; | |
2962 | goto recovery_tree_root; | |
2963 | } | |
2964 | ||
2965 | btrfs_set_root_node(&tree_root->root_item, tree_root->node); | |
2966 | tree_root->commit_root = btrfs_root_node(tree_root); | |
2967 | btrfs_set_root_refs(&tree_root->root_item, 1); | |
2968 | ||
2969 | mutex_lock(&tree_root->objectid_mutex); | |
2970 | ret = btrfs_find_highest_objectid(tree_root, | |
2971 | &tree_root->highest_objectid); | |
2972 | if (ret) { | |
2973 | mutex_unlock(&tree_root->objectid_mutex); | |
2974 | goto recovery_tree_root; | |
2975 | } | |
2976 | ||
2977 | ASSERT(tree_root->highest_objectid <= BTRFS_LAST_FREE_OBJECTID); | |
2978 | ||
2979 | mutex_unlock(&tree_root->objectid_mutex); | |
2980 | ||
2981 | ret = btrfs_read_roots(fs_info); | |
2982 | if (ret) | |
2983 | goto recovery_tree_root; | |
2984 | ||
2985 | fs_info->generation = generation; | |
2986 | fs_info->last_trans_committed = generation; | |
2987 | ||
2988 | ret = btrfs_recover_balance(fs_info); | |
2989 | if (ret) { | |
2990 | btrfs_err(fs_info, "failed to recover balance: %d", ret); | |
2991 | goto fail_block_groups; | |
2992 | } | |
2993 | ||
2994 | ret = btrfs_init_dev_stats(fs_info); | |
2995 | if (ret) { | |
2996 | btrfs_err(fs_info, "failed to init dev_stats: %d", ret); | |
2997 | goto fail_block_groups; | |
2998 | } | |
2999 | ||
3000 | ret = btrfs_init_dev_replace(fs_info); | |
3001 | if (ret) { | |
3002 | btrfs_err(fs_info, "failed to init dev_replace: %d", ret); | |
3003 | goto fail_block_groups; | |
3004 | } | |
3005 | ||
3006 | btrfs_close_extra_devices(fs_devices, 1); | |
3007 | ||
3008 | ret = btrfs_sysfs_add_fsid(fs_devices, NULL); | |
3009 | if (ret) { | |
3010 | btrfs_err(fs_info, "failed to init sysfs fsid interface: %d", | |
3011 | ret); | |
3012 | goto fail_block_groups; | |
3013 | } | |
3014 | ||
3015 | ret = btrfs_sysfs_add_device(fs_devices); | |
3016 | if (ret) { | |
3017 | btrfs_err(fs_info, "failed to init sysfs device interface: %d", | |
3018 | ret); | |
3019 | goto fail_fsdev_sysfs; | |
3020 | } | |
3021 | ||
3022 | ret = btrfs_sysfs_add_mounted(fs_info); | |
3023 | if (ret) { | |
3024 | btrfs_err(fs_info, "failed to init sysfs interface: %d", ret); | |
3025 | goto fail_fsdev_sysfs; | |
3026 | } | |
3027 | ||
3028 | ret = btrfs_init_space_info(fs_info); | |
3029 | if (ret) { | |
3030 | btrfs_err(fs_info, "failed to initialize space info: %d", ret); | |
3031 | goto fail_sysfs; | |
3032 | } | |
3033 | ||
3034 | ret = btrfs_read_block_groups(fs_info); | |
3035 | if (ret) { | |
3036 | btrfs_err(fs_info, "failed to read block groups: %d", ret); | |
3037 | goto fail_sysfs; | |
3038 | } | |
3039 | fs_info->num_tolerated_disk_barrier_failures = | |
3040 | btrfs_calc_num_tolerated_disk_barrier_failures(fs_info); | |
3041 | if (fs_info->fs_devices->missing_devices > | |
3042 | fs_info->num_tolerated_disk_barrier_failures && | |
3043 | !(sb->s_flags & MS_RDONLY)) { | |
3044 | btrfs_warn(fs_info, | |
3045 | "missing devices (%llu) exceeds the limit (%d), writeable mount is not allowed", | |
3046 | fs_info->fs_devices->missing_devices, | |
3047 | fs_info->num_tolerated_disk_barrier_failures); | |
3048 | goto fail_sysfs; | |
3049 | } | |
3050 | ||
3051 | fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, | |
3052 | "btrfs-cleaner"); | |
3053 | if (IS_ERR(fs_info->cleaner_kthread)) | |
3054 | goto fail_sysfs; | |
3055 | ||
3056 | fs_info->transaction_kthread = kthread_run(transaction_kthread, | |
3057 | tree_root, | |
3058 | "btrfs-transaction"); | |
3059 | if (IS_ERR(fs_info->transaction_kthread)) | |
3060 | goto fail_cleaner; | |
3061 | ||
3062 | if (!btrfs_test_opt(tree_root->fs_info, SSD) && | |
3063 | !btrfs_test_opt(tree_root->fs_info, NOSSD) && | |
3064 | !fs_info->fs_devices->rotating) { | |
3065 | btrfs_info(fs_info, "detected SSD devices, enabling SSD mode"); | |
3066 | btrfs_set_opt(fs_info->mount_opt, SSD); | |
3067 | } | |
3068 | ||
3069 | /* | |
3070 | * Mount does not set all options immediately, we can do it now and do | |
3071 | * not have to wait for transaction commit | |
3072 | */ | |
3073 | btrfs_apply_pending_changes(fs_info); | |
3074 | ||
3075 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY | |
3076 | if (btrfs_test_opt(tree_root->fs_info, CHECK_INTEGRITY)) { | |
3077 | ret = btrfsic_mount(tree_root, fs_devices, | |
3078 | btrfs_test_opt(tree_root->fs_info, | |
3079 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA) ? | |
3080 | 1 : 0, | |
3081 | fs_info->check_integrity_print_mask); | |
3082 | if (ret) | |
3083 | btrfs_warn(fs_info, | |
3084 | "failed to initialize integrity check module: %d", | |
3085 | ret); | |
3086 | } | |
3087 | #endif | |
3088 | ret = btrfs_read_qgroup_config(fs_info); | |
3089 | if (ret) | |
3090 | goto fail_trans_kthread; | |
3091 | ||
3092 | /* do not make disk changes in broken FS or nologreplay is given */ | |
3093 | if (btrfs_super_log_root(disk_super) != 0 && | |
3094 | !btrfs_test_opt(tree_root->fs_info, NOLOGREPLAY)) { | |
3095 | ret = btrfs_replay_log(fs_info, fs_devices); | |
3096 | if (ret) { | |
3097 | err = ret; | |
3098 | goto fail_qgroup; | |
3099 | } | |
3100 | } | |
3101 | ||
3102 | ret = btrfs_find_orphan_roots(fs_info); | |
3103 | if (ret) | |
3104 | goto fail_qgroup; | |
3105 | ||
3106 | if (!(sb->s_flags & MS_RDONLY)) { | |
3107 | ret = btrfs_cleanup_fs_roots(fs_info); | |
3108 | if (ret) | |
3109 | goto fail_qgroup; | |
3110 | ||
3111 | mutex_lock(&fs_info->cleaner_mutex); | |
3112 | ret = btrfs_recover_relocation(tree_root); | |
3113 | mutex_unlock(&fs_info->cleaner_mutex); | |
3114 | if (ret < 0) { | |
3115 | btrfs_warn(fs_info, "failed to recover relocation: %d", | |
3116 | ret); | |
3117 | err = -EINVAL; | |
3118 | goto fail_qgroup; | |
3119 | } | |
3120 | } | |
3121 | ||
3122 | location.objectid = BTRFS_FS_TREE_OBJECTID; | |
3123 | location.type = BTRFS_ROOT_ITEM_KEY; | |
3124 | location.offset = 0; | |
3125 | ||
3126 | fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); | |
3127 | if (IS_ERR(fs_info->fs_root)) { | |
3128 | err = PTR_ERR(fs_info->fs_root); | |
3129 | goto fail_qgroup; | |
3130 | } | |
3131 | ||
3132 | if (sb->s_flags & MS_RDONLY) | |
3133 | return 0; | |
3134 | ||
3135 | if (btrfs_test_opt(fs_info, CLEAR_CACHE) && | |
3136 | btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { | |
3137 | clear_free_space_tree = 1; | |
3138 | } else if (btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE) && | |
3139 | !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID)) { | |
3140 | btrfs_warn(fs_info, "free space tree is invalid"); | |
3141 | clear_free_space_tree = 1; | |
3142 | } | |
3143 | ||
3144 | if (clear_free_space_tree) { | |
3145 | btrfs_info(fs_info, "clearing free space tree"); | |
3146 | ret = btrfs_clear_free_space_tree(fs_info); | |
3147 | if (ret) { | |
3148 | btrfs_warn(fs_info, | |
3149 | "failed to clear free space tree: %d", ret); | |
3150 | close_ctree(fs_info); | |
3151 | return ret; | |
3152 | } | |
3153 | } | |
3154 | ||
3155 | if (btrfs_test_opt(tree_root->fs_info, FREE_SPACE_TREE) && | |
3156 | !btrfs_fs_compat_ro(fs_info, FREE_SPACE_TREE)) { | |
3157 | btrfs_info(fs_info, "creating free space tree"); | |
3158 | ret = btrfs_create_free_space_tree(fs_info); | |
3159 | if (ret) { | |
3160 | btrfs_warn(fs_info, | |
3161 | "failed to create free space tree: %d", ret); | |
3162 | close_ctree(fs_info); | |
3163 | return ret; | |
3164 | } | |
3165 | } | |
3166 | ||
3167 | down_read(&fs_info->cleanup_work_sem); | |
3168 | if ((ret = btrfs_orphan_cleanup(fs_info->fs_root)) || | |
3169 | (ret = btrfs_orphan_cleanup(fs_info->tree_root))) { | |
3170 | up_read(&fs_info->cleanup_work_sem); | |
3171 | close_ctree(fs_info); | |
3172 | return ret; | |
3173 | } | |
3174 | up_read(&fs_info->cleanup_work_sem); | |
3175 | ||
3176 | ret = btrfs_resume_balance_async(fs_info); | |
3177 | if (ret) { | |
3178 | btrfs_warn(fs_info, "failed to resume balance: %d", ret); | |
3179 | close_ctree(fs_info); | |
3180 | return ret; | |
3181 | } | |
3182 | ||
3183 | ret = btrfs_resume_dev_replace_async(fs_info); | |
3184 | if (ret) { | |
3185 | btrfs_warn(fs_info, "failed to resume device replace: %d", ret); | |
3186 | close_ctree(fs_info); | |
3187 | return ret; | |
3188 | } | |
3189 | ||
3190 | btrfs_qgroup_rescan_resume(fs_info); | |
3191 | ||
3192 | if (!fs_info->uuid_root) { | |
3193 | btrfs_info(fs_info, "creating UUID tree"); | |
3194 | ret = btrfs_create_uuid_tree(fs_info); | |
3195 | if (ret) { | |
3196 | btrfs_warn(fs_info, | |
3197 | "failed to create the UUID tree: %d", ret); | |
3198 | close_ctree(fs_info); | |
3199 | return ret; | |
3200 | } | |
3201 | } else if (btrfs_test_opt(tree_root->fs_info, RESCAN_UUID_TREE) || | |
3202 | fs_info->generation != | |
3203 | btrfs_super_uuid_tree_generation(disk_super)) { | |
3204 | btrfs_info(fs_info, "checking UUID tree"); | |
3205 | ret = btrfs_check_uuid_tree(fs_info); | |
3206 | if (ret) { | |
3207 | btrfs_warn(fs_info, | |
3208 | "failed to check the UUID tree: %d", ret); | |
3209 | close_ctree(fs_info); | |
3210 | return ret; | |
3211 | } | |
3212 | } else { | |
3213 | set_bit(BTRFS_FS_UPDATE_UUID_TREE_GEN, &fs_info->flags); | |
3214 | } | |
3215 | set_bit(BTRFS_FS_OPEN, &fs_info->flags); | |
3216 | ||
3217 | /* | |
3218 | * backuproot only affect mount behavior, and if open_ctree succeeded, | |
3219 | * no need to keep the flag | |
3220 | */ | |
3221 | btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT); | |
3222 | ||
3223 | return 0; | |
3224 | ||
3225 | fail_qgroup: | |
3226 | btrfs_free_qgroup_config(fs_info); | |
3227 | fail_trans_kthread: | |
3228 | kthread_stop(fs_info->transaction_kthread); | |
3229 | btrfs_cleanup_transaction(fs_info->tree_root); | |
3230 | btrfs_free_fs_roots(fs_info); | |
3231 | fail_cleaner: | |
3232 | kthread_stop(fs_info->cleaner_kthread); | |
3233 | ||
3234 | /* | |
3235 | * make sure we're done with the btree inode before we stop our | |
3236 | * kthreads | |
3237 | */ | |
3238 | filemap_write_and_wait(fs_info->btree_inode->i_mapping); | |
3239 | ||
3240 | fail_sysfs: | |
3241 | btrfs_sysfs_remove_mounted(fs_info); | |
3242 | ||
3243 | fail_fsdev_sysfs: | |
3244 | btrfs_sysfs_remove_fsid(fs_info->fs_devices); | |
3245 | ||
3246 | fail_block_groups: | |
3247 | btrfs_put_block_group_cache(fs_info); | |
3248 | btrfs_free_block_groups(fs_info); | |
3249 | ||
3250 | fail_tree_roots: | |
3251 | free_root_pointers(fs_info, 1); | |
3252 | invalidate_inode_pages2(fs_info->btree_inode->i_mapping); | |
3253 | ||
3254 | fail_sb_buffer: | |
3255 | btrfs_stop_all_workers(fs_info); | |
3256 | fail_alloc: | |
3257 | fail_iput: | |
3258 | btrfs_mapping_tree_free(&fs_info->mapping_tree); | |
3259 | ||
3260 | iput(fs_info->btree_inode); | |
3261 | fail_bio_counter: | |
3262 | percpu_counter_destroy(&fs_info->bio_counter); | |
3263 | fail_delalloc_bytes: | |
3264 | percpu_counter_destroy(&fs_info->delalloc_bytes); | |
3265 | fail_dirty_metadata_bytes: | |
3266 | percpu_counter_destroy(&fs_info->dirty_metadata_bytes); | |
3267 | fail_bdi: | |
3268 | bdi_destroy(&fs_info->bdi); | |
3269 | fail_srcu: | |
3270 | cleanup_srcu_struct(&fs_info->subvol_srcu); | |
3271 | fail: | |
3272 | btrfs_free_stripe_hash_table(fs_info); | |
3273 | btrfs_close_devices(fs_info->fs_devices); | |
3274 | return err; | |
3275 | ||
3276 | recovery_tree_root: | |
3277 | if (!btrfs_test_opt(tree_root->fs_info, USEBACKUPROOT)) | |
3278 | goto fail_tree_roots; | |
3279 | ||
3280 | free_root_pointers(fs_info, 0); | |
3281 | ||
3282 | /* don't use the log in recovery mode, it won't be valid */ | |
3283 | btrfs_set_super_log_root(disk_super, 0); | |
3284 | ||
3285 | /* we can't trust the free space cache either */ | |
3286 | btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE); | |
3287 | ||
3288 | ret = next_root_backup(fs_info, fs_info->super_copy, | |
3289 | &num_backups_tried, &backup_index); | |
3290 | if (ret == -1) | |
3291 | goto fail_block_groups; | |
3292 | goto retry_root_backup; | |
3293 | } | |
3294 | ||
3295 | static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) | |
3296 | { | |
3297 | if (uptodate) { | |
3298 | set_buffer_uptodate(bh); | |
3299 | } else { | |
3300 | struct btrfs_device *device = (struct btrfs_device *) | |
3301 | bh->b_private; | |
3302 | ||
3303 | btrfs_warn_rl_in_rcu(device->fs_info, | |
3304 | "lost page write due to IO error on %s", | |
3305 | rcu_str_deref(device->name)); | |
3306 | /* note, we don't set_buffer_write_io_error because we have | |
3307 | * our own ways of dealing with the IO errors | |
3308 | */ | |
3309 | clear_buffer_uptodate(bh); | |
3310 | btrfs_dev_stat_inc_and_print(device, BTRFS_DEV_STAT_WRITE_ERRS); | |
3311 | } | |
3312 | unlock_buffer(bh); | |
3313 | put_bh(bh); | |
3314 | } | |
3315 | ||
3316 | int btrfs_read_dev_one_super(struct block_device *bdev, int copy_num, | |
3317 | struct buffer_head **bh_ret) | |
3318 | { | |
3319 | struct buffer_head *bh; | |
3320 | struct btrfs_super_block *super; | |
3321 | u64 bytenr; | |
3322 | ||
3323 | bytenr = btrfs_sb_offset(copy_num); | |
3324 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= i_size_read(bdev->bd_inode)) | |
3325 | return -EINVAL; | |
3326 | ||
3327 | bh = __bread(bdev, bytenr / 4096, BTRFS_SUPER_INFO_SIZE); | |
3328 | /* | |
3329 | * If we fail to read from the underlying devices, as of now | |
3330 | * the best option we have is to mark it EIO. | |
3331 | */ | |
3332 | if (!bh) | |
3333 | return -EIO; | |
3334 | ||
3335 | super = (struct btrfs_super_block *)bh->b_data; | |
3336 | if (btrfs_super_bytenr(super) != bytenr || | |
3337 | btrfs_super_magic(super) != BTRFS_MAGIC) { | |
3338 | brelse(bh); | |
3339 | return -EINVAL; | |
3340 | } | |
3341 | ||
3342 | *bh_ret = bh; | |
3343 | return 0; | |
3344 | } | |
3345 | ||
3346 | ||
3347 | struct buffer_head *btrfs_read_dev_super(struct block_device *bdev) | |
3348 | { | |
3349 | struct buffer_head *bh; | |
3350 | struct buffer_head *latest = NULL; | |
3351 | struct btrfs_super_block *super; | |
3352 | int i; | |
3353 | u64 transid = 0; | |
3354 | int ret = -EINVAL; | |
3355 | ||
3356 | /* we would like to check all the supers, but that would make | |
3357 | * a btrfs mount succeed after a mkfs from a different FS. | |
3358 | * So, we need to add a special mount option to scan for | |
3359 | * later supers, using BTRFS_SUPER_MIRROR_MAX instead | |
3360 | */ | |
3361 | for (i = 0; i < 1; i++) { | |
3362 | ret = btrfs_read_dev_one_super(bdev, i, &bh); | |
3363 | if (ret) | |
3364 | continue; | |
3365 | ||
3366 | super = (struct btrfs_super_block *)bh->b_data; | |
3367 | ||
3368 | if (!latest || btrfs_super_generation(super) > transid) { | |
3369 | brelse(latest); | |
3370 | latest = bh; | |
3371 | transid = btrfs_super_generation(super); | |
3372 | } else { | |
3373 | brelse(bh); | |
3374 | } | |
3375 | } | |
3376 | ||
3377 | if (!latest) | |
3378 | return ERR_PTR(ret); | |
3379 | ||
3380 | return latest; | |
3381 | } | |
3382 | ||
3383 | /* | |
3384 | * this should be called twice, once with wait == 0 and | |
3385 | * once with wait == 1. When wait == 0 is done, all the buffer heads | |
3386 | * we write are pinned. | |
3387 | * | |
3388 | * They are released when wait == 1 is done. | |
3389 | * max_mirrors must be the same for both runs, and it indicates how | |
3390 | * many supers on this one device should be written. | |
3391 | * | |
3392 | * max_mirrors == 0 means to write them all. | |
3393 | */ | |
3394 | static int write_dev_supers(struct btrfs_device *device, | |
3395 | struct btrfs_super_block *sb, | |
3396 | int do_barriers, int wait, int max_mirrors) | |
3397 | { | |
3398 | struct buffer_head *bh; | |
3399 | int i; | |
3400 | int ret; | |
3401 | int errors = 0; | |
3402 | u32 crc; | |
3403 | u64 bytenr; | |
3404 | ||
3405 | if (max_mirrors == 0) | |
3406 | max_mirrors = BTRFS_SUPER_MIRROR_MAX; | |
3407 | ||
3408 | for (i = 0; i < max_mirrors; i++) { | |
3409 | bytenr = btrfs_sb_offset(i); | |
3410 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= | |
3411 | device->commit_total_bytes) | |
3412 | break; | |
3413 | ||
3414 | if (wait) { | |
3415 | bh = __find_get_block(device->bdev, bytenr / 4096, | |
3416 | BTRFS_SUPER_INFO_SIZE); | |
3417 | if (!bh) { | |
3418 | errors++; | |
3419 | continue; | |
3420 | } | |
3421 | wait_on_buffer(bh); | |
3422 | if (!buffer_uptodate(bh)) | |
3423 | errors++; | |
3424 | ||
3425 | /* drop our reference */ | |
3426 | brelse(bh); | |
3427 | ||
3428 | /* drop the reference from the wait == 0 run */ | |
3429 | brelse(bh); | |
3430 | continue; | |
3431 | } else { | |
3432 | btrfs_set_super_bytenr(sb, bytenr); | |
3433 | ||
3434 | crc = ~(u32)0; | |
3435 | crc = btrfs_csum_data((char *)sb + | |
3436 | BTRFS_CSUM_SIZE, crc, | |
3437 | BTRFS_SUPER_INFO_SIZE - | |
3438 | BTRFS_CSUM_SIZE); | |
3439 | btrfs_csum_final(crc, sb->csum); | |
3440 | ||
3441 | /* | |
3442 | * one reference for us, and we leave it for the | |
3443 | * caller | |
3444 | */ | |
3445 | bh = __getblk(device->bdev, bytenr / 4096, | |
3446 | BTRFS_SUPER_INFO_SIZE); | |
3447 | if (!bh) { | |
3448 | btrfs_err(device->fs_info, | |
3449 | "couldn't get super buffer head for bytenr %llu", | |
3450 | bytenr); | |
3451 | errors++; | |
3452 | continue; | |
3453 | } | |
3454 | ||
3455 | memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); | |
3456 | ||
3457 | /* one reference for submit_bh */ | |
3458 | get_bh(bh); | |
3459 | ||
3460 | set_buffer_uptodate(bh); | |
3461 | lock_buffer(bh); | |
3462 | bh->b_end_io = btrfs_end_buffer_write_sync; | |
3463 | bh->b_private = device; | |
3464 | } | |
3465 | ||
3466 | /* | |
3467 | * we fua the first super. The others we allow | |
3468 | * to go down lazy. | |
3469 | */ | |
3470 | if (i == 0) | |
3471 | ret = btrfsic_submit_bh(REQ_OP_WRITE, WRITE_FUA, bh); | |
3472 | else | |
3473 | ret = btrfsic_submit_bh(REQ_OP_WRITE, WRITE_SYNC, bh); | |
3474 | if (ret) | |
3475 | errors++; | |
3476 | } | |
3477 | return errors < i ? 0 : -1; | |
3478 | } | |
3479 | ||
3480 | /* | |
3481 | * endio for the write_dev_flush, this will wake anyone waiting | |
3482 | * for the barrier when it is done | |
3483 | */ | |
3484 | static void btrfs_end_empty_barrier(struct bio *bio) | |
3485 | { | |
3486 | if (bio->bi_private) | |
3487 | complete(bio->bi_private); | |
3488 | bio_put(bio); | |
3489 | } | |
3490 | ||
3491 | /* | |
3492 | * trigger flushes for one the devices. If you pass wait == 0, the flushes are | |
3493 | * sent down. With wait == 1, it waits for the previous flush. | |
3494 | * | |
3495 | * any device where the flush fails with eopnotsupp are flagged as not-barrier | |
3496 | * capable | |
3497 | */ | |
3498 | static int write_dev_flush(struct btrfs_device *device, int wait) | |
3499 | { | |
3500 | struct bio *bio; | |
3501 | int ret = 0; | |
3502 | ||
3503 | if (device->nobarriers) | |
3504 | return 0; | |
3505 | ||
3506 | if (wait) { | |
3507 | bio = device->flush_bio; | |
3508 | if (!bio) | |
3509 | return 0; | |
3510 | ||
3511 | wait_for_completion(&device->flush_wait); | |
3512 | ||
3513 | if (bio->bi_error) { | |
3514 | ret = bio->bi_error; | |
3515 | btrfs_dev_stat_inc_and_print(device, | |
3516 | BTRFS_DEV_STAT_FLUSH_ERRS); | |
3517 | } | |
3518 | ||
3519 | /* drop the reference from the wait == 0 run */ | |
3520 | bio_put(bio); | |
3521 | device->flush_bio = NULL; | |
3522 | ||
3523 | return ret; | |
3524 | } | |
3525 | ||
3526 | /* | |
3527 | * one reference for us, and we leave it for the | |
3528 | * caller | |
3529 | */ | |
3530 | device->flush_bio = NULL; | |
3531 | bio = btrfs_io_bio_alloc(GFP_NOFS, 0); | |
3532 | if (!bio) | |
3533 | return -ENOMEM; | |
3534 | ||
3535 | bio->bi_end_io = btrfs_end_empty_barrier; | |
3536 | bio->bi_bdev = device->bdev; | |
3537 | bio_set_op_attrs(bio, REQ_OP_WRITE, WRITE_FLUSH); | |
3538 | init_completion(&device->flush_wait); | |
3539 | bio->bi_private = &device->flush_wait; | |
3540 | device->flush_bio = bio; | |
3541 | ||
3542 | bio_get(bio); | |
3543 | btrfsic_submit_bio(bio); | |
3544 | ||
3545 | return 0; | |
3546 | } | |
3547 | ||
3548 | /* | |
3549 | * send an empty flush down to each device in parallel, | |
3550 | * then wait for them | |
3551 | */ | |
3552 | static int barrier_all_devices(struct btrfs_fs_info *info) | |
3553 | { | |
3554 | struct list_head *head; | |
3555 | struct btrfs_device *dev; | |
3556 | int errors_send = 0; | |
3557 | int errors_wait = 0; | |
3558 | int ret; | |
3559 | ||
3560 | /* send down all the barriers */ | |
3561 | head = &info->fs_devices->devices; | |
3562 | list_for_each_entry_rcu(dev, head, dev_list) { | |
3563 | if (dev->missing) | |
3564 | continue; | |
3565 | if (!dev->bdev) { | |
3566 | errors_send++; | |
3567 | continue; | |
3568 | } | |
3569 | if (!dev->in_fs_metadata || !dev->writeable) | |
3570 | continue; | |
3571 | ||
3572 | ret = write_dev_flush(dev, 0); | |
3573 | if (ret) | |
3574 | errors_send++; | |
3575 | } | |
3576 | ||
3577 | /* wait for all the barriers */ | |
3578 | list_for_each_entry_rcu(dev, head, dev_list) { | |
3579 | if (dev->missing) | |
3580 | continue; | |
3581 | if (!dev->bdev) { | |
3582 | errors_wait++; | |
3583 | continue; | |
3584 | } | |
3585 | if (!dev->in_fs_metadata || !dev->writeable) | |
3586 | continue; | |
3587 | ||
3588 | ret = write_dev_flush(dev, 1); | |
3589 | if (ret) | |
3590 | errors_wait++; | |
3591 | } | |
3592 | if (errors_send > info->num_tolerated_disk_barrier_failures || | |
3593 | errors_wait > info->num_tolerated_disk_barrier_failures) | |
3594 | return -EIO; | |
3595 | return 0; | |
3596 | } | |
3597 | ||
3598 | int btrfs_get_num_tolerated_disk_barrier_failures(u64 flags) | |
3599 | { | |
3600 | int raid_type; | |
3601 | int min_tolerated = INT_MAX; | |
3602 | ||
3603 | if ((flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 || | |
3604 | (flags & BTRFS_AVAIL_ALLOC_BIT_SINGLE)) | |
3605 | min_tolerated = min(min_tolerated, | |
3606 | btrfs_raid_array[BTRFS_RAID_SINGLE]. | |
3607 | tolerated_failures); | |
3608 | ||
3609 | for (raid_type = 0; raid_type < BTRFS_NR_RAID_TYPES; raid_type++) { | |
3610 | if (raid_type == BTRFS_RAID_SINGLE) | |
3611 | continue; | |
3612 | if (!(flags & btrfs_raid_group[raid_type])) | |
3613 | continue; | |
3614 | min_tolerated = min(min_tolerated, | |
3615 | btrfs_raid_array[raid_type]. | |
3616 | tolerated_failures); | |
3617 | } | |
3618 | ||
3619 | if (min_tolerated == INT_MAX) { | |
3620 | pr_warn("BTRFS: unknown raid flag: %llu", flags); | |
3621 | min_tolerated = 0; | |
3622 | } | |
3623 | ||
3624 | return min_tolerated; | |
3625 | } | |
3626 | ||
3627 | int btrfs_calc_num_tolerated_disk_barrier_failures( | |
3628 | struct btrfs_fs_info *fs_info) | |
3629 | { | |
3630 | struct btrfs_ioctl_space_info space; | |
3631 | struct btrfs_space_info *sinfo; | |
3632 | u64 types[] = {BTRFS_BLOCK_GROUP_DATA, | |
3633 | BTRFS_BLOCK_GROUP_SYSTEM, | |
3634 | BTRFS_BLOCK_GROUP_METADATA, | |
3635 | BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_METADATA}; | |
3636 | int i; | |
3637 | int c; | |
3638 | int num_tolerated_disk_barrier_failures = | |
3639 | (int)fs_info->fs_devices->num_devices; | |
3640 | ||
3641 | for (i = 0; i < ARRAY_SIZE(types); i++) { | |
3642 | struct btrfs_space_info *tmp; | |
3643 | ||
3644 | sinfo = NULL; | |
3645 | rcu_read_lock(); | |
3646 | list_for_each_entry_rcu(tmp, &fs_info->space_info, list) { | |
3647 | if (tmp->flags == types[i]) { | |
3648 | sinfo = tmp; | |
3649 | break; | |
3650 | } | |
3651 | } | |
3652 | rcu_read_unlock(); | |
3653 | ||
3654 | if (!sinfo) | |
3655 | continue; | |
3656 | ||
3657 | down_read(&sinfo->groups_sem); | |
3658 | for (c = 0; c < BTRFS_NR_RAID_TYPES; c++) { | |
3659 | u64 flags; | |
3660 | ||
3661 | if (list_empty(&sinfo->block_groups[c])) | |
3662 | continue; | |
3663 | ||
3664 | btrfs_get_block_group_info(&sinfo->block_groups[c], | |
3665 | &space); | |
3666 | if (space.total_bytes == 0 || space.used_bytes == 0) | |
3667 | continue; | |
3668 | flags = space.flags; | |
3669 | ||
3670 | num_tolerated_disk_barrier_failures = min( | |
3671 | num_tolerated_disk_barrier_failures, | |
3672 | btrfs_get_num_tolerated_disk_barrier_failures( | |
3673 | flags)); | |
3674 | } | |
3675 | up_read(&sinfo->groups_sem); | |
3676 | } | |
3677 | ||
3678 | return num_tolerated_disk_barrier_failures; | |
3679 | } | |
3680 | ||
3681 | static int write_all_supers(struct btrfs_root *root, int max_mirrors) | |
3682 | { | |
3683 | struct list_head *head; | |
3684 | struct btrfs_device *dev; | |
3685 | struct btrfs_super_block *sb; | |
3686 | struct btrfs_dev_item *dev_item; | |
3687 | int ret; | |
3688 | int do_barriers; | |
3689 | int max_errors; | |
3690 | int total_errors = 0; | |
3691 | u64 flags; | |
3692 | ||
3693 | do_barriers = !btrfs_test_opt(root->fs_info, NOBARRIER); | |
3694 | backup_super_roots(root->fs_info); | |
3695 | ||
3696 | sb = root->fs_info->super_for_commit; | |
3697 | dev_item = &sb->dev_item; | |
3698 | ||
3699 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
3700 | head = &root->fs_info->fs_devices->devices; | |
3701 | max_errors = btrfs_super_num_devices(root->fs_info->super_copy) - 1; | |
3702 | ||
3703 | if (do_barriers) { | |
3704 | ret = barrier_all_devices(root->fs_info); | |
3705 | if (ret) { | |
3706 | mutex_unlock( | |
3707 | &root->fs_info->fs_devices->device_list_mutex); | |
3708 | btrfs_handle_fs_error(root->fs_info, ret, | |
3709 | "errors while submitting device barriers."); | |
3710 | return ret; | |
3711 | } | |
3712 | } | |
3713 | ||
3714 | list_for_each_entry_rcu(dev, head, dev_list) { | |
3715 | if (!dev->bdev) { | |
3716 | total_errors++; | |
3717 | continue; | |
3718 | } | |
3719 | if (!dev->in_fs_metadata || !dev->writeable) | |
3720 | continue; | |
3721 | ||
3722 | btrfs_set_stack_device_generation(dev_item, 0); | |
3723 | btrfs_set_stack_device_type(dev_item, dev->type); | |
3724 | btrfs_set_stack_device_id(dev_item, dev->devid); | |
3725 | btrfs_set_stack_device_total_bytes(dev_item, | |
3726 | dev->commit_total_bytes); | |
3727 | btrfs_set_stack_device_bytes_used(dev_item, | |
3728 | dev->commit_bytes_used); | |
3729 | btrfs_set_stack_device_io_align(dev_item, dev->io_align); | |
3730 | btrfs_set_stack_device_io_width(dev_item, dev->io_width); | |
3731 | btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); | |
3732 | memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); | |
3733 | memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); | |
3734 | ||
3735 | flags = btrfs_super_flags(sb); | |
3736 | btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); | |
3737 | ||
3738 | ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors); | |
3739 | if (ret) | |
3740 | total_errors++; | |
3741 | } | |
3742 | if (total_errors > max_errors) { | |
3743 | btrfs_err(root->fs_info, "%d errors while writing supers", | |
3744 | total_errors); | |
3745 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
3746 | ||
3747 | /* FUA is masked off if unsupported and can't be the reason */ | |
3748 | btrfs_handle_fs_error(root->fs_info, -EIO, | |
3749 | "%d errors while writing supers", total_errors); | |
3750 | return -EIO; | |
3751 | } | |
3752 | ||
3753 | total_errors = 0; | |
3754 | list_for_each_entry_rcu(dev, head, dev_list) { | |
3755 | if (!dev->bdev) | |
3756 | continue; | |
3757 | if (!dev->in_fs_metadata || !dev->writeable) | |
3758 | continue; | |
3759 | ||
3760 | ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors); | |
3761 | if (ret) | |
3762 | total_errors++; | |
3763 | } | |
3764 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); | |
3765 | if (total_errors > max_errors) { | |
3766 | btrfs_handle_fs_error(root->fs_info, -EIO, | |
3767 | "%d errors while writing supers", total_errors); | |
3768 | return -EIO; | |
3769 | } | |
3770 | return 0; | |
3771 | } | |
3772 | ||
3773 | int write_ctree_super(struct btrfs_trans_handle *trans, | |
3774 | struct btrfs_root *root, int max_mirrors) | |
3775 | { | |
3776 | return write_all_supers(root, max_mirrors); | |
3777 | } | |
3778 | ||
3779 | /* Drop a fs root from the radix tree and free it. */ | |
3780 | void btrfs_drop_and_free_fs_root(struct btrfs_fs_info *fs_info, | |
3781 | struct btrfs_root *root) | |
3782 | { | |
3783 | spin_lock(&fs_info->fs_roots_radix_lock); | |
3784 | radix_tree_delete(&fs_info->fs_roots_radix, | |
3785 | (unsigned long)root->root_key.objectid); | |
3786 | spin_unlock(&fs_info->fs_roots_radix_lock); | |
3787 | ||
3788 | if (btrfs_root_refs(&root->root_item) == 0) | |
3789 | synchronize_srcu(&fs_info->subvol_srcu); | |
3790 | ||
3791 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { | |
3792 | btrfs_free_log(NULL, root); | |
3793 | if (root->reloc_root) { | |
3794 | free_extent_buffer(root->reloc_root->node); | |
3795 | free_extent_buffer(root->reloc_root->commit_root); | |
3796 | btrfs_put_fs_root(root->reloc_root); | |
3797 | root->reloc_root = NULL; | |
3798 | } | |
3799 | } | |
3800 | ||
3801 | if (root->free_ino_pinned) | |
3802 | __btrfs_remove_free_space_cache(root->free_ino_pinned); | |
3803 | if (root->free_ino_ctl) | |
3804 | __btrfs_remove_free_space_cache(root->free_ino_ctl); | |
3805 | free_fs_root(root); | |
3806 | } | |
3807 | ||
3808 | static void free_fs_root(struct btrfs_root *root) | |
3809 | { | |
3810 | iput(root->ino_cache_inode); | |
3811 | WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree)); | |
3812 | btrfs_free_block_rsv(root, root->orphan_block_rsv); | |
3813 | root->orphan_block_rsv = NULL; | |
3814 | if (root->anon_dev) | |
3815 | free_anon_bdev(root->anon_dev); | |
3816 | if (root->subv_writers) | |
3817 | btrfs_free_subvolume_writers(root->subv_writers); | |
3818 | free_extent_buffer(root->node); | |
3819 | free_extent_buffer(root->commit_root); | |
3820 | kfree(root->free_ino_ctl); | |
3821 | kfree(root->free_ino_pinned); | |
3822 | kfree(root->name); | |
3823 | btrfs_put_fs_root(root); | |
3824 | } | |
3825 | ||
3826 | void btrfs_free_fs_root(struct btrfs_root *root) | |
3827 | { | |
3828 | free_fs_root(root); | |
3829 | } | |
3830 | ||
3831 | int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) | |
3832 | { | |
3833 | u64 root_objectid = 0; | |
3834 | struct btrfs_root *gang[8]; | |
3835 | int i = 0; | |
3836 | int err = 0; | |
3837 | unsigned int ret = 0; | |
3838 | int index; | |
3839 | ||
3840 | while (1) { | |
3841 | index = srcu_read_lock(&fs_info->subvol_srcu); | |
3842 | ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, | |
3843 | (void **)gang, root_objectid, | |
3844 | ARRAY_SIZE(gang)); | |
3845 | if (!ret) { | |
3846 | srcu_read_unlock(&fs_info->subvol_srcu, index); | |
3847 | break; | |
3848 | } | |
3849 | root_objectid = gang[ret - 1]->root_key.objectid + 1; | |
3850 | ||
3851 | for (i = 0; i < ret; i++) { | |
3852 | /* Avoid to grab roots in dead_roots */ | |
3853 | if (btrfs_root_refs(&gang[i]->root_item) == 0) { | |
3854 | gang[i] = NULL; | |
3855 | continue; | |
3856 | } | |
3857 | /* grab all the search result for later use */ | |
3858 | gang[i] = btrfs_grab_fs_root(gang[i]); | |
3859 | } | |
3860 | srcu_read_unlock(&fs_info->subvol_srcu, index); | |
3861 | ||
3862 | for (i = 0; i < ret; i++) { | |
3863 | if (!gang[i]) | |
3864 | continue; | |
3865 | root_objectid = gang[i]->root_key.objectid; | |
3866 | err = btrfs_orphan_cleanup(gang[i]); | |
3867 | if (err) | |
3868 | break; | |
3869 | btrfs_put_fs_root(gang[i]); | |
3870 | } | |
3871 | root_objectid++; | |
3872 | } | |
3873 | ||
3874 | /* release the uncleaned roots due to error */ | |
3875 | for (; i < ret; i++) { | |
3876 | if (gang[i]) | |
3877 | btrfs_put_fs_root(gang[i]); | |
3878 | } | |
3879 | return err; | |
3880 | } | |
3881 | ||
3882 | int btrfs_commit_super(struct btrfs_fs_info *fs_info) | |
3883 | { | |
3884 | struct btrfs_root *root = fs_info->tree_root; | |
3885 | struct btrfs_trans_handle *trans; | |
3886 | ||
3887 | mutex_lock(&root->fs_info->cleaner_mutex); | |
3888 | btrfs_run_delayed_iputs(root); | |
3889 | mutex_unlock(&root->fs_info->cleaner_mutex); | |
3890 | wake_up_process(root->fs_info->cleaner_kthread); | |
3891 | ||
3892 | /* wait until ongoing cleanup work done */ | |
3893 | down_write(&root->fs_info->cleanup_work_sem); | |
3894 | up_write(&root->fs_info->cleanup_work_sem); | |
3895 | ||
3896 | trans = btrfs_join_transaction(root); | |
3897 | if (IS_ERR(trans)) | |
3898 | return PTR_ERR(trans); | |
3899 | return btrfs_commit_transaction(trans, root); | |
3900 | } | |
3901 | ||
3902 | void close_ctree(struct btrfs_fs_info *fs_info) | |
3903 | { | |
3904 | struct btrfs_root *root = fs_info->tree_root; | |
3905 | int ret; | |
3906 | ||
3907 | set_bit(BTRFS_FS_CLOSING_START, &fs_info->flags); | |
3908 | ||
3909 | /* wait for the qgroup rescan worker to stop */ | |
3910 | btrfs_qgroup_wait_for_completion(fs_info, false); | |
3911 | ||
3912 | /* wait for the uuid_scan task to finish */ | |
3913 | down(&fs_info->uuid_tree_rescan_sem); | |
3914 | /* avoid complains from lockdep et al., set sem back to initial state */ | |
3915 | up(&fs_info->uuid_tree_rescan_sem); | |
3916 | ||
3917 | /* pause restriper - we want to resume on mount */ | |
3918 | btrfs_pause_balance(fs_info); | |
3919 | ||
3920 | btrfs_dev_replace_suspend_for_unmount(fs_info); | |
3921 | ||
3922 | btrfs_scrub_cancel(fs_info); | |
3923 | ||
3924 | /* wait for any defraggers to finish */ | |
3925 | wait_event(fs_info->transaction_wait, | |
3926 | (atomic_read(&fs_info->defrag_running) == 0)); | |
3927 | ||
3928 | /* clear out the rbtree of defraggable inodes */ | |
3929 | btrfs_cleanup_defrag_inodes(fs_info); | |
3930 | ||
3931 | cancel_work_sync(&fs_info->async_reclaim_work); | |
3932 | ||
3933 | if (!(fs_info->sb->s_flags & MS_RDONLY)) { | |
3934 | /* | |
3935 | * If the cleaner thread is stopped and there are | |
3936 | * block groups queued for removal, the deletion will be | |
3937 | * skipped when we quit the cleaner thread. | |
3938 | */ | |
3939 | btrfs_delete_unused_bgs(root->fs_info); | |
3940 | ||
3941 | ret = btrfs_commit_super(fs_info); | |
3942 | if (ret) | |
3943 | btrfs_err(fs_info, "commit super ret %d", ret); | |
3944 | } | |
3945 | ||
3946 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) | |
3947 | btrfs_error_commit_super(root); | |
3948 | ||
3949 | kthread_stop(fs_info->transaction_kthread); | |
3950 | kthread_stop(fs_info->cleaner_kthread); | |
3951 | ||
3952 | set_bit(BTRFS_FS_CLOSING_DONE, &fs_info->flags); | |
3953 | ||
3954 | btrfs_free_qgroup_config(fs_info); | |
3955 | ||
3956 | if (percpu_counter_sum(&fs_info->delalloc_bytes)) { | |
3957 | btrfs_info(fs_info, "at unmount delalloc count %lld", | |
3958 | percpu_counter_sum(&fs_info->delalloc_bytes)); | |
3959 | } | |
3960 | ||
3961 | btrfs_sysfs_remove_mounted(fs_info); | |
3962 | btrfs_sysfs_remove_fsid(fs_info->fs_devices); | |
3963 | ||
3964 | btrfs_free_fs_roots(fs_info); | |
3965 | ||
3966 | btrfs_put_block_group_cache(fs_info); | |
3967 | ||
3968 | btrfs_free_block_groups(fs_info); | |
3969 | ||
3970 | /* | |
3971 | * we must make sure there is not any read request to | |
3972 | * submit after we stopping all workers. | |
3973 | */ | |
3974 | invalidate_inode_pages2(fs_info->btree_inode->i_mapping); | |
3975 | btrfs_stop_all_workers(fs_info); | |
3976 | ||
3977 | clear_bit(BTRFS_FS_OPEN, &fs_info->flags); | |
3978 | free_root_pointers(fs_info, 1); | |
3979 | ||
3980 | iput(fs_info->btree_inode); | |
3981 | ||
3982 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY | |
3983 | if (btrfs_test_opt(root->fs_info, CHECK_INTEGRITY)) | |
3984 | btrfsic_unmount(root, fs_info->fs_devices); | |
3985 | #endif | |
3986 | ||
3987 | btrfs_close_devices(fs_info->fs_devices); | |
3988 | btrfs_mapping_tree_free(&fs_info->mapping_tree); | |
3989 | ||
3990 | percpu_counter_destroy(&fs_info->dirty_metadata_bytes); | |
3991 | percpu_counter_destroy(&fs_info->delalloc_bytes); | |
3992 | percpu_counter_destroy(&fs_info->bio_counter); | |
3993 | bdi_destroy(&fs_info->bdi); | |
3994 | cleanup_srcu_struct(&fs_info->subvol_srcu); | |
3995 | ||
3996 | btrfs_free_stripe_hash_table(fs_info); | |
3997 | ||
3998 | __btrfs_free_block_rsv(root->orphan_block_rsv); | |
3999 | root->orphan_block_rsv = NULL; | |
4000 | ||
4001 | lock_chunks(root->fs_info); | |
4002 | while (!list_empty(&fs_info->pinned_chunks)) { | |
4003 | struct extent_map *em; | |
4004 | ||
4005 | em = list_first_entry(&fs_info->pinned_chunks, | |
4006 | struct extent_map, list); | |
4007 | list_del_init(&em->list); | |
4008 | free_extent_map(em); | |
4009 | } | |
4010 | unlock_chunks(root->fs_info); | |
4011 | } | |
4012 | ||
4013 | int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid, | |
4014 | int atomic) | |
4015 | { | |
4016 | int ret; | |
4017 | struct inode *btree_inode = buf->pages[0]->mapping->host; | |
4018 | ||
4019 | ret = extent_buffer_uptodate(buf); | |
4020 | if (!ret) | |
4021 | return ret; | |
4022 | ||
4023 | ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, | |
4024 | parent_transid, atomic); | |
4025 | if (ret == -EAGAIN) | |
4026 | return ret; | |
4027 | return !ret; | |
4028 | } | |
4029 | ||
4030 | void btrfs_mark_buffer_dirty(struct extent_buffer *buf) | |
4031 | { | |
4032 | struct btrfs_root *root; | |
4033 | u64 transid = btrfs_header_generation(buf); | |
4034 | int was_dirty; | |
4035 | ||
4036 | #ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS | |
4037 | /* | |
4038 | * This is a fast path so only do this check if we have sanity tests | |
4039 | * enabled. Normal people shouldn't be marking dummy buffers as dirty | |
4040 | * outside of the sanity tests. | |
4041 | */ | |
4042 | if (unlikely(test_bit(EXTENT_BUFFER_DUMMY, &buf->bflags))) | |
4043 | return; | |
4044 | #endif | |
4045 | root = BTRFS_I(buf->pages[0]->mapping->host)->root; | |
4046 | btrfs_assert_tree_locked(buf); | |
4047 | if (transid != root->fs_info->generation) | |
4048 | WARN(1, KERN_CRIT "btrfs transid mismatch buffer %llu, found %llu running %llu\n", | |
4049 | buf->start, transid, root->fs_info->generation); | |
4050 | was_dirty = set_extent_buffer_dirty(buf); | |
4051 | if (!was_dirty) | |
4052 | __percpu_counter_add(&root->fs_info->dirty_metadata_bytes, | |
4053 | buf->len, | |
4054 | root->fs_info->dirty_metadata_batch); | |
4055 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY | |
4056 | if (btrfs_header_level(buf) == 0 && check_leaf(root, buf)) { | |
4057 | btrfs_print_leaf(root, buf); | |
4058 | ASSERT(0); | |
4059 | } | |
4060 | #endif | |
4061 | } | |
4062 | ||
4063 | static void __btrfs_btree_balance_dirty(struct btrfs_root *root, | |
4064 | int flush_delayed) | |
4065 | { | |
4066 | /* | |
4067 | * looks as though older kernels can get into trouble with | |
4068 | * this code, they end up stuck in balance_dirty_pages forever | |
4069 | */ | |
4070 | int ret; | |
4071 | ||
4072 | if (current->flags & PF_MEMALLOC) | |
4073 | return; | |
4074 | ||
4075 | if (flush_delayed) | |
4076 | btrfs_balance_delayed_items(root); | |
4077 | ||
4078 | ret = percpu_counter_compare(&root->fs_info->dirty_metadata_bytes, | |
4079 | BTRFS_DIRTY_METADATA_THRESH); | |
4080 | if (ret > 0) { | |
4081 | balance_dirty_pages_ratelimited( | |
4082 | root->fs_info->btree_inode->i_mapping); | |
4083 | } | |
4084 | } | |
4085 | ||
4086 | void btrfs_btree_balance_dirty(struct btrfs_root *root) | |
4087 | { | |
4088 | __btrfs_btree_balance_dirty(root, 1); | |
4089 | } | |
4090 | ||
4091 | void btrfs_btree_balance_dirty_nodelay(struct btrfs_root *root) | |
4092 | { | |
4093 | __btrfs_btree_balance_dirty(root, 0); | |
4094 | } | |
4095 | ||
4096 | int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) | |
4097 | { | |
4098 | struct btrfs_root *root = BTRFS_I(buf->pages[0]->mapping->host)->root; | |
4099 | return btree_read_extent_buffer_pages(root, buf, parent_transid); | |
4100 | } | |
4101 | ||
4102 | static int btrfs_check_super_valid(struct btrfs_fs_info *fs_info, | |
4103 | int read_only) | |
4104 | { | |
4105 | struct btrfs_super_block *sb = fs_info->super_copy; | |
4106 | u64 nodesize = btrfs_super_nodesize(sb); | |
4107 | u64 sectorsize = btrfs_super_sectorsize(sb); | |
4108 | int ret = 0; | |
4109 | ||
4110 | if (btrfs_super_magic(sb) != BTRFS_MAGIC) { | |
4111 | btrfs_err(fs_info, "no valid FS found"); | |
4112 | ret = -EINVAL; | |
4113 | } | |
4114 | if (btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP) | |
4115 | btrfs_warn(fs_info, "unrecognized super flag: %llu", | |
4116 | btrfs_super_flags(sb) & ~BTRFS_SUPER_FLAG_SUPP); | |
4117 | if (btrfs_super_root_level(sb) >= BTRFS_MAX_LEVEL) { | |
4118 | btrfs_err(fs_info, "tree_root level too big: %d >= %d", | |
4119 | btrfs_super_root_level(sb), BTRFS_MAX_LEVEL); | |
4120 | ret = -EINVAL; | |
4121 | } | |
4122 | if (btrfs_super_chunk_root_level(sb) >= BTRFS_MAX_LEVEL) { | |
4123 | btrfs_err(fs_info, "chunk_root level too big: %d >= %d", | |
4124 | btrfs_super_chunk_root_level(sb), BTRFS_MAX_LEVEL); | |
4125 | ret = -EINVAL; | |
4126 | } | |
4127 | if (btrfs_super_log_root_level(sb) >= BTRFS_MAX_LEVEL) { | |
4128 | btrfs_err(fs_info, "log_root level too big: %d >= %d", | |
4129 | btrfs_super_log_root_level(sb), BTRFS_MAX_LEVEL); | |
4130 | ret = -EINVAL; | |
4131 | } | |
4132 | ||
4133 | /* | |
4134 | * Check sectorsize and nodesize first, other check will need it. | |
4135 | * Check all possible sectorsize(4K, 8K, 16K, 32K, 64K) here. | |
4136 | */ | |
4137 | if (!is_power_of_2(sectorsize) || sectorsize < 4096 || | |
4138 | sectorsize > BTRFS_MAX_METADATA_BLOCKSIZE) { | |
4139 | btrfs_err(fs_info, "invalid sectorsize %llu", sectorsize); | |
4140 | ret = -EINVAL; | |
4141 | } | |
4142 | /* Only PAGE SIZE is supported yet */ | |
4143 | if (sectorsize != PAGE_SIZE) { | |
4144 | btrfs_err(fs_info, | |
4145 | "sectorsize %llu not supported yet, only support %lu", | |
4146 | sectorsize, PAGE_SIZE); | |
4147 | ret = -EINVAL; | |
4148 | } | |
4149 | if (!is_power_of_2(nodesize) || nodesize < sectorsize || | |
4150 | nodesize > BTRFS_MAX_METADATA_BLOCKSIZE) { | |
4151 | btrfs_err(fs_info, "invalid nodesize %llu", nodesize); | |
4152 | ret = -EINVAL; | |
4153 | } | |
4154 | if (nodesize != le32_to_cpu(sb->__unused_leafsize)) { | |
4155 | btrfs_err(fs_info, "invalid leafsize %u, should be %llu", | |
4156 | le32_to_cpu(sb->__unused_leafsize), nodesize); | |
4157 | ret = -EINVAL; | |
4158 | } | |
4159 | ||
4160 | /* Root alignment check */ | |
4161 | if (!IS_ALIGNED(btrfs_super_root(sb), sectorsize)) { | |
4162 | btrfs_warn(fs_info, "tree_root block unaligned: %llu", | |
4163 | btrfs_super_root(sb)); | |
4164 | ret = -EINVAL; | |
4165 | } | |
4166 | if (!IS_ALIGNED(btrfs_super_chunk_root(sb), sectorsize)) { | |
4167 | btrfs_warn(fs_info, "chunk_root block unaligned: %llu", | |
4168 | btrfs_super_chunk_root(sb)); | |
4169 | ret = -EINVAL; | |
4170 | } | |
4171 | if (!IS_ALIGNED(btrfs_super_log_root(sb), sectorsize)) { | |
4172 | btrfs_warn(fs_info, "log_root block unaligned: %llu", | |
4173 | btrfs_super_log_root(sb)); | |
4174 | ret = -EINVAL; | |
4175 | } | |
4176 | ||
4177 | if (memcmp(fs_info->fsid, sb->dev_item.fsid, BTRFS_UUID_SIZE) != 0) { | |
4178 | btrfs_err(fs_info, | |
4179 | "dev_item UUID does not match fsid: %pU != %pU", | |
4180 | fs_info->fsid, sb->dev_item.fsid); | |
4181 | ret = -EINVAL; | |
4182 | } | |
4183 | ||
4184 | /* | |
4185 | * Hint to catch really bogus numbers, bitflips or so, more exact checks are | |
4186 | * done later | |
4187 | */ | |
4188 | if (btrfs_super_bytes_used(sb) < 6 * btrfs_super_nodesize(sb)) { | |
4189 | btrfs_err(fs_info, "bytes_used is too small %llu", | |
4190 | btrfs_super_bytes_used(sb)); | |
4191 | ret = -EINVAL; | |
4192 | } | |
4193 | if (!is_power_of_2(btrfs_super_stripesize(sb))) { | |
4194 | btrfs_err(fs_info, "invalid stripesize %u", | |
4195 | btrfs_super_stripesize(sb)); | |
4196 | ret = -EINVAL; | |
4197 | } | |
4198 | if (btrfs_super_num_devices(sb) > (1UL << 31)) | |
4199 | btrfs_warn(fs_info, "suspicious number of devices: %llu", | |
4200 | btrfs_super_num_devices(sb)); | |
4201 | if (btrfs_super_num_devices(sb) == 0) { | |
4202 | btrfs_err(fs_info, "number of devices is 0"); | |
4203 | ret = -EINVAL; | |
4204 | } | |
4205 | ||
4206 | if (btrfs_super_bytenr(sb) != BTRFS_SUPER_INFO_OFFSET) { | |
4207 | btrfs_err(fs_info, "super offset mismatch %llu != %u", | |
4208 | btrfs_super_bytenr(sb), BTRFS_SUPER_INFO_OFFSET); | |
4209 | ret = -EINVAL; | |
4210 | } | |
4211 | ||
4212 | /* | |
4213 | * Obvious sys_chunk_array corruptions, it must hold at least one key | |
4214 | * and one chunk | |
4215 | */ | |
4216 | if (btrfs_super_sys_array_size(sb) > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) { | |
4217 | btrfs_err(fs_info, "system chunk array too big %u > %u", | |
4218 | btrfs_super_sys_array_size(sb), | |
4219 | BTRFS_SYSTEM_CHUNK_ARRAY_SIZE); | |
4220 | ret = -EINVAL; | |
4221 | } | |
4222 | if (btrfs_super_sys_array_size(sb) < sizeof(struct btrfs_disk_key) | |
4223 | + sizeof(struct btrfs_chunk)) { | |
4224 | btrfs_err(fs_info, "system chunk array too small %u < %zu", | |
4225 | btrfs_super_sys_array_size(sb), | |
4226 | sizeof(struct btrfs_disk_key) | |
4227 | + sizeof(struct btrfs_chunk)); | |
4228 | ret = -EINVAL; | |
4229 | } | |
4230 | ||
4231 | /* | |
4232 | * The generation is a global counter, we'll trust it more than the others | |
4233 | * but it's still possible that it's the one that's wrong. | |
4234 | */ | |
4235 | if (btrfs_super_generation(sb) < btrfs_super_chunk_root_generation(sb)) | |
4236 | btrfs_warn(fs_info, | |
4237 | "suspicious: generation < chunk_root_generation: %llu < %llu", | |
4238 | btrfs_super_generation(sb), | |
4239 | btrfs_super_chunk_root_generation(sb)); | |
4240 | if (btrfs_super_generation(sb) < btrfs_super_cache_generation(sb) | |
4241 | && btrfs_super_cache_generation(sb) != (u64)-1) | |
4242 | btrfs_warn(fs_info, | |
4243 | "suspicious: generation < cache_generation: %llu < %llu", | |
4244 | btrfs_super_generation(sb), | |
4245 | btrfs_super_cache_generation(sb)); | |
4246 | ||
4247 | return ret; | |
4248 | } | |
4249 | ||
4250 | static void btrfs_error_commit_super(struct btrfs_root *root) | |
4251 | { | |
4252 | mutex_lock(&root->fs_info->cleaner_mutex); | |
4253 | btrfs_run_delayed_iputs(root); | |
4254 | mutex_unlock(&root->fs_info->cleaner_mutex); | |
4255 | ||
4256 | down_write(&root->fs_info->cleanup_work_sem); | |
4257 | up_write(&root->fs_info->cleanup_work_sem); | |
4258 | ||
4259 | /* cleanup FS via transaction */ | |
4260 | btrfs_cleanup_transaction(root); | |
4261 | } | |
4262 | ||
4263 | static void btrfs_destroy_ordered_extents(struct btrfs_root *root) | |
4264 | { | |
4265 | struct btrfs_ordered_extent *ordered; | |
4266 | ||
4267 | spin_lock(&root->ordered_extent_lock); | |
4268 | /* | |
4269 | * This will just short circuit the ordered completion stuff which will | |
4270 | * make sure the ordered extent gets properly cleaned up. | |
4271 | */ | |
4272 | list_for_each_entry(ordered, &root->ordered_extents, | |
4273 | root_extent_list) | |
4274 | set_bit(BTRFS_ORDERED_IOERR, &ordered->flags); | |
4275 | spin_unlock(&root->ordered_extent_lock); | |
4276 | } | |
4277 | ||
4278 | static void btrfs_destroy_all_ordered_extents(struct btrfs_fs_info *fs_info) | |
4279 | { | |
4280 | struct btrfs_root *root; | |
4281 | struct list_head splice; | |
4282 | ||
4283 | INIT_LIST_HEAD(&splice); | |
4284 | ||
4285 | spin_lock(&fs_info->ordered_root_lock); | |
4286 | list_splice_init(&fs_info->ordered_roots, &splice); | |
4287 | while (!list_empty(&splice)) { | |
4288 | root = list_first_entry(&splice, struct btrfs_root, | |
4289 | ordered_root); | |
4290 | list_move_tail(&root->ordered_root, | |
4291 | &fs_info->ordered_roots); | |
4292 | ||
4293 | spin_unlock(&fs_info->ordered_root_lock); | |
4294 | btrfs_destroy_ordered_extents(root); | |
4295 | ||
4296 | cond_resched(); | |
4297 | spin_lock(&fs_info->ordered_root_lock); | |
4298 | } | |
4299 | spin_unlock(&fs_info->ordered_root_lock); | |
4300 | } | |
4301 | ||
4302 | static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, | |
4303 | struct btrfs_root *root) | |
4304 | { | |
4305 | struct rb_node *node; | |
4306 | struct btrfs_delayed_ref_root *delayed_refs; | |
4307 | struct btrfs_delayed_ref_node *ref; | |
4308 | int ret = 0; | |
4309 | ||
4310 | delayed_refs = &trans->delayed_refs; | |
4311 | ||
4312 | spin_lock(&delayed_refs->lock); | |
4313 | if (atomic_read(&delayed_refs->num_entries) == 0) { | |
4314 | spin_unlock(&delayed_refs->lock); | |
4315 | btrfs_info(root->fs_info, "delayed_refs has NO entry"); | |
4316 | return ret; | |
4317 | } | |
4318 | ||
4319 | while ((node = rb_first(&delayed_refs->href_root)) != NULL) { | |
4320 | struct btrfs_delayed_ref_head *head; | |
4321 | struct btrfs_delayed_ref_node *tmp; | |
4322 | bool pin_bytes = false; | |
4323 | ||
4324 | head = rb_entry(node, struct btrfs_delayed_ref_head, | |
4325 | href_node); | |
4326 | if (!mutex_trylock(&head->mutex)) { | |
4327 | atomic_inc(&head->node.refs); | |
4328 | spin_unlock(&delayed_refs->lock); | |
4329 | ||
4330 | mutex_lock(&head->mutex); | |
4331 | mutex_unlock(&head->mutex); | |
4332 | btrfs_put_delayed_ref(&head->node); | |
4333 | spin_lock(&delayed_refs->lock); | |
4334 | continue; | |
4335 | } | |
4336 | spin_lock(&head->lock); | |
4337 | list_for_each_entry_safe_reverse(ref, tmp, &head->ref_list, | |
4338 | list) { | |
4339 | ref->in_tree = 0; | |
4340 | list_del(&ref->list); | |
4341 | if (!list_empty(&ref->add_list)) | |
4342 | list_del(&ref->add_list); | |
4343 | atomic_dec(&delayed_refs->num_entries); | |
4344 | btrfs_put_delayed_ref(ref); | |
4345 | } | |
4346 | if (head->must_insert_reserved) | |
4347 | pin_bytes = true; | |
4348 | btrfs_free_delayed_extent_op(head->extent_op); | |
4349 | delayed_refs->num_heads--; | |
4350 | if (head->processing == 0) | |
4351 | delayed_refs->num_heads_ready--; | |
4352 | atomic_dec(&delayed_refs->num_entries); | |
4353 | head->node.in_tree = 0; | |
4354 | rb_erase(&head->href_node, &delayed_refs->href_root); | |
4355 | spin_unlock(&head->lock); | |
4356 | spin_unlock(&delayed_refs->lock); | |
4357 | mutex_unlock(&head->mutex); | |
4358 | ||
4359 | if (pin_bytes) | |
4360 | btrfs_pin_extent(root, head->node.bytenr, | |
4361 | head->node.num_bytes, 1); | |
4362 | btrfs_put_delayed_ref(&head->node); | |
4363 | cond_resched(); | |
4364 | spin_lock(&delayed_refs->lock); | |
4365 | } | |
4366 | ||
4367 | spin_unlock(&delayed_refs->lock); | |
4368 | ||
4369 | return ret; | |
4370 | } | |
4371 | ||
4372 | static void btrfs_destroy_delalloc_inodes(struct btrfs_root *root) | |
4373 | { | |
4374 | struct btrfs_inode *btrfs_inode; | |
4375 | struct list_head splice; | |
4376 | ||
4377 | INIT_LIST_HEAD(&splice); | |
4378 | ||
4379 | spin_lock(&root->delalloc_lock); | |
4380 | list_splice_init(&root->delalloc_inodes, &splice); | |
4381 | ||
4382 | while (!list_empty(&splice)) { | |
4383 | btrfs_inode = list_first_entry(&splice, struct btrfs_inode, | |
4384 | delalloc_inodes); | |
4385 | ||
4386 | list_del_init(&btrfs_inode->delalloc_inodes); | |
4387 | clear_bit(BTRFS_INODE_IN_DELALLOC_LIST, | |
4388 | &btrfs_inode->runtime_flags); | |
4389 | spin_unlock(&root->delalloc_lock); | |
4390 | ||
4391 | btrfs_invalidate_inodes(btrfs_inode->root); | |
4392 | ||
4393 | spin_lock(&root->delalloc_lock); | |
4394 | } | |
4395 | ||
4396 | spin_unlock(&root->delalloc_lock); | |
4397 | } | |
4398 | ||
4399 | static void btrfs_destroy_all_delalloc_inodes(struct btrfs_fs_info *fs_info) | |
4400 | { | |
4401 | struct btrfs_root *root; | |
4402 | struct list_head splice; | |
4403 | ||
4404 | INIT_LIST_HEAD(&splice); | |
4405 | ||
4406 | spin_lock(&fs_info->delalloc_root_lock); | |
4407 | list_splice_init(&fs_info->delalloc_roots, &splice); | |
4408 | while (!list_empty(&splice)) { | |
4409 | root = list_first_entry(&splice, struct btrfs_root, | |
4410 | delalloc_root); | |
4411 | list_del_init(&root->delalloc_root); | |
4412 | root = btrfs_grab_fs_root(root); | |
4413 | BUG_ON(!root); | |
4414 | spin_unlock(&fs_info->delalloc_root_lock); | |
4415 | ||
4416 | btrfs_destroy_delalloc_inodes(root); | |
4417 | btrfs_put_fs_root(root); | |
4418 | ||
4419 | spin_lock(&fs_info->delalloc_root_lock); | |
4420 | } | |
4421 | spin_unlock(&fs_info->delalloc_root_lock); | |
4422 | } | |
4423 | ||
4424 | static int btrfs_destroy_marked_extents(struct btrfs_root *root, | |
4425 | struct extent_io_tree *dirty_pages, | |
4426 | int mark) | |
4427 | { | |
4428 | int ret; | |
4429 | struct extent_buffer *eb; | |
4430 | u64 start = 0; | |
4431 | u64 end; | |
4432 | ||
4433 | while (1) { | |
4434 | ret = find_first_extent_bit(dirty_pages, start, &start, &end, | |
4435 | mark, NULL); | |
4436 | if (ret) | |
4437 | break; | |
4438 | ||
4439 | clear_extent_bits(dirty_pages, start, end, mark); | |
4440 | while (start <= end) { | |
4441 | eb = find_extent_buffer(root->fs_info, start); | |
4442 | start += root->fs_info->nodesize; | |
4443 | if (!eb) | |
4444 | continue; | |
4445 | wait_on_extent_buffer_writeback(eb); | |
4446 | ||
4447 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, | |
4448 | &eb->bflags)) | |
4449 | clear_extent_buffer_dirty(eb); | |
4450 | free_extent_buffer_stale(eb); | |
4451 | } | |
4452 | } | |
4453 | ||
4454 | return ret; | |
4455 | } | |
4456 | ||
4457 | static int btrfs_destroy_pinned_extent(struct btrfs_root *root, | |
4458 | struct extent_io_tree *pinned_extents) | |
4459 | { | |
4460 | struct extent_io_tree *unpin; | |
4461 | u64 start; | |
4462 | u64 end; | |
4463 | int ret; | |
4464 | bool loop = true; | |
4465 | ||
4466 | unpin = pinned_extents; | |
4467 | again: | |
4468 | while (1) { | |
4469 | ret = find_first_extent_bit(unpin, 0, &start, &end, | |
4470 | EXTENT_DIRTY, NULL); | |
4471 | if (ret) | |
4472 | break; | |
4473 | ||
4474 | clear_extent_dirty(unpin, start, end); | |
4475 | btrfs_error_unpin_extent_range(root, start, end); | |
4476 | cond_resched(); | |
4477 | } | |
4478 | ||
4479 | if (loop) { | |
4480 | if (unpin == &root->fs_info->freed_extents[0]) | |
4481 | unpin = &root->fs_info->freed_extents[1]; | |
4482 | else | |
4483 | unpin = &root->fs_info->freed_extents[0]; | |
4484 | loop = false; | |
4485 | goto again; | |
4486 | } | |
4487 | ||
4488 | return 0; | |
4489 | } | |
4490 | ||
4491 | static void btrfs_cleanup_bg_io(struct btrfs_block_group_cache *cache) | |
4492 | { | |
4493 | struct inode *inode; | |
4494 | ||
4495 | inode = cache->io_ctl.inode; | |
4496 | if (inode) { | |
4497 | invalidate_inode_pages2(inode->i_mapping); | |
4498 | BTRFS_I(inode)->generation = 0; | |
4499 | cache->io_ctl.inode = NULL; | |
4500 | iput(inode); | |
4501 | } | |
4502 | btrfs_put_block_group(cache); | |
4503 | } | |
4504 | ||
4505 | void btrfs_cleanup_dirty_bgs(struct btrfs_transaction *cur_trans, | |
4506 | struct btrfs_root *root) | |
4507 | { | |
4508 | struct btrfs_block_group_cache *cache; | |
4509 | ||
4510 | spin_lock(&cur_trans->dirty_bgs_lock); | |
4511 | while (!list_empty(&cur_trans->dirty_bgs)) { | |
4512 | cache = list_first_entry(&cur_trans->dirty_bgs, | |
4513 | struct btrfs_block_group_cache, | |
4514 | dirty_list); | |
4515 | if (!cache) { | |
4516 | btrfs_err(root->fs_info, | |
4517 | "orphan block group dirty_bgs list"); | |
4518 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
4519 | return; | |
4520 | } | |
4521 | ||
4522 | if (!list_empty(&cache->io_list)) { | |
4523 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
4524 | list_del_init(&cache->io_list); | |
4525 | btrfs_cleanup_bg_io(cache); | |
4526 | spin_lock(&cur_trans->dirty_bgs_lock); | |
4527 | } | |
4528 | ||
4529 | list_del_init(&cache->dirty_list); | |
4530 | spin_lock(&cache->lock); | |
4531 | cache->disk_cache_state = BTRFS_DC_ERROR; | |
4532 | spin_unlock(&cache->lock); | |
4533 | ||
4534 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
4535 | btrfs_put_block_group(cache); | |
4536 | spin_lock(&cur_trans->dirty_bgs_lock); | |
4537 | } | |
4538 | spin_unlock(&cur_trans->dirty_bgs_lock); | |
4539 | ||
4540 | while (!list_empty(&cur_trans->io_bgs)) { | |
4541 | cache = list_first_entry(&cur_trans->io_bgs, | |
4542 | struct btrfs_block_group_cache, | |
4543 | io_list); | |
4544 | if (!cache) { | |
4545 | btrfs_err(root->fs_info, | |
4546 | "orphan block group on io_bgs list"); | |
4547 | return; | |
4548 | } | |
4549 | ||
4550 | list_del_init(&cache->io_list); | |
4551 | spin_lock(&cache->lock); | |
4552 | cache->disk_cache_state = BTRFS_DC_ERROR; | |
4553 | spin_unlock(&cache->lock); | |
4554 | btrfs_cleanup_bg_io(cache); | |
4555 | } | |
4556 | } | |
4557 | ||
4558 | void btrfs_cleanup_one_transaction(struct btrfs_transaction *cur_trans, | |
4559 | struct btrfs_root *root) | |
4560 | { | |
4561 | btrfs_cleanup_dirty_bgs(cur_trans, root); | |
4562 | ASSERT(list_empty(&cur_trans->dirty_bgs)); | |
4563 | ASSERT(list_empty(&cur_trans->io_bgs)); | |
4564 | ||
4565 | btrfs_destroy_delayed_refs(cur_trans, root); | |
4566 | ||
4567 | cur_trans->state = TRANS_STATE_COMMIT_START; | |
4568 | wake_up(&root->fs_info->transaction_blocked_wait); | |
4569 | ||
4570 | cur_trans->state = TRANS_STATE_UNBLOCKED; | |
4571 | wake_up(&root->fs_info->transaction_wait); | |
4572 | ||
4573 | btrfs_destroy_delayed_inodes(root); | |
4574 | btrfs_assert_delayed_root_empty(root); | |
4575 | ||
4576 | btrfs_destroy_marked_extents(root, &cur_trans->dirty_pages, | |
4577 | EXTENT_DIRTY); | |
4578 | btrfs_destroy_pinned_extent(root, | |
4579 | root->fs_info->pinned_extents); | |
4580 | ||
4581 | cur_trans->state =TRANS_STATE_COMPLETED; | |
4582 | wake_up(&cur_trans->commit_wait); | |
4583 | ||
4584 | /* | |
4585 | memset(cur_trans, 0, sizeof(*cur_trans)); | |
4586 | kmem_cache_free(btrfs_transaction_cachep, cur_trans); | |
4587 | */ | |
4588 | } | |
4589 | ||
4590 | static int btrfs_cleanup_transaction(struct btrfs_root *root) | |
4591 | { | |
4592 | struct btrfs_transaction *t; | |
4593 | ||
4594 | mutex_lock(&root->fs_info->transaction_kthread_mutex); | |
4595 | ||
4596 | spin_lock(&root->fs_info->trans_lock); | |
4597 | while (!list_empty(&root->fs_info->trans_list)) { | |
4598 | t = list_first_entry(&root->fs_info->trans_list, | |
4599 | struct btrfs_transaction, list); | |
4600 | if (t->state >= TRANS_STATE_COMMIT_START) { | |
4601 | atomic_inc(&t->use_count); | |
4602 | spin_unlock(&root->fs_info->trans_lock); | |
4603 | btrfs_wait_for_commit(root, t->transid); | |
4604 | btrfs_put_transaction(t); | |
4605 | spin_lock(&root->fs_info->trans_lock); | |
4606 | continue; | |
4607 | } | |
4608 | if (t == root->fs_info->running_transaction) { | |
4609 | t->state = TRANS_STATE_COMMIT_DOING; | |
4610 | spin_unlock(&root->fs_info->trans_lock); | |
4611 | /* | |
4612 | * We wait for 0 num_writers since we don't hold a trans | |
4613 | * handle open currently for this transaction. | |
4614 | */ | |
4615 | wait_event(t->writer_wait, | |
4616 | atomic_read(&t->num_writers) == 0); | |
4617 | } else { | |
4618 | spin_unlock(&root->fs_info->trans_lock); | |
4619 | } | |
4620 | btrfs_cleanup_one_transaction(t, root); | |
4621 | ||
4622 | spin_lock(&root->fs_info->trans_lock); | |
4623 | if (t == root->fs_info->running_transaction) | |
4624 | root->fs_info->running_transaction = NULL; | |
4625 | list_del_init(&t->list); | |
4626 | spin_unlock(&root->fs_info->trans_lock); | |
4627 | ||
4628 | btrfs_put_transaction(t); | |
4629 | trace_btrfs_transaction_commit(root); | |
4630 | spin_lock(&root->fs_info->trans_lock); | |
4631 | } | |
4632 | spin_unlock(&root->fs_info->trans_lock); | |
4633 | btrfs_destroy_all_ordered_extents(root->fs_info); | |
4634 | btrfs_destroy_delayed_inodes(root); | |
4635 | btrfs_assert_delayed_root_empty(root); | |
4636 | btrfs_destroy_pinned_extent(root, root->fs_info->pinned_extents); | |
4637 | btrfs_destroy_all_delalloc_inodes(root->fs_info); | |
4638 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
4639 | ||
4640 | return 0; | |
4641 | } | |
4642 | ||
4643 | static const struct extent_io_ops btree_extent_io_ops = { | |
4644 | .readpage_end_io_hook = btree_readpage_end_io_hook, | |
4645 | .readpage_io_failed_hook = btree_io_failed_hook, | |
4646 | .submit_bio_hook = btree_submit_bio_hook, | |
4647 | /* note we're sharing with inode.c for the merge bio hook */ | |
4648 | .merge_bio_hook = btrfs_merge_bio_hook, | |
4649 | }; |