Commit | Line | Data |
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6cbd5570 CM |
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 | ||
e20d96d6 | 19 | #include <linux/fs.h> |
d98237b3 | 20 | #include <linux/blkdev.h> |
87cbda5c | 21 | #include <linux/scatterlist.h> |
22b0ebda | 22 | #include <linux/swap.h> |
0f7d52f4 | 23 | #include <linux/radix-tree.h> |
35b7e476 | 24 | #include <linux/writeback.h> |
d397712b | 25 | #include <linux/buffer_head.h> |
ce9adaa5 | 26 | #include <linux/workqueue.h> |
a74a4b97 | 27 | #include <linux/kthread.h> |
4b4e25f2 | 28 | #include <linux/freezer.h> |
163e783e | 29 | #include <linux/crc32c.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
784b4e29 | 31 | #include <linux/migrate.h> |
7a36ddec | 32 | #include <linux/ratelimit.h> |
7e75bf3f | 33 | #include <asm/unaligned.h> |
4b4e25f2 | 34 | #include "compat.h" |
eb60ceac CM |
35 | #include "ctree.h" |
36 | #include "disk-io.h" | |
e089f05c | 37 | #include "transaction.h" |
0f7d52f4 | 38 | #include "btrfs_inode.h" |
0b86a832 | 39 | #include "volumes.h" |
db94535d | 40 | #include "print-tree.h" |
8b712842 | 41 | #include "async-thread.h" |
925baedd | 42 | #include "locking.h" |
e02119d5 | 43 | #include "tree-log.h" |
fa9c0d79 | 44 | #include "free-space-cache.h" |
581bb050 | 45 | #include "inode-map.h" |
21adbd5c | 46 | #include "check-integrity.h" |
eb60ceac | 47 | |
d1310b2e | 48 | static struct extent_io_ops btree_extent_io_ops; |
8b712842 | 49 | static void end_workqueue_fn(struct btrfs_work *work); |
4df27c4d | 50 | static void free_fs_root(struct btrfs_root *root); |
acce952b | 51 | static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info, |
52 | int read_only); | |
53 | static int btrfs_destroy_ordered_operations(struct btrfs_root *root); | |
54 | static int btrfs_destroy_ordered_extents(struct btrfs_root *root); | |
55 | static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, | |
56 | struct btrfs_root *root); | |
57 | static int btrfs_destroy_pending_snapshots(struct btrfs_transaction *t); | |
58 | static int btrfs_destroy_delalloc_inodes(struct btrfs_root *root); | |
59 | static int btrfs_destroy_marked_extents(struct btrfs_root *root, | |
60 | struct extent_io_tree *dirty_pages, | |
61 | int mark); | |
62 | static int btrfs_destroy_pinned_extent(struct btrfs_root *root, | |
63 | struct extent_io_tree *pinned_extents); | |
64 | static int btrfs_cleanup_transaction(struct btrfs_root *root); | |
ce9adaa5 | 65 | |
d352ac68 CM |
66 | /* |
67 | * end_io_wq structs are used to do processing in task context when an IO is | |
68 | * complete. This is used during reads to verify checksums, and it is used | |
69 | * by writes to insert metadata for new file extents after IO is complete. | |
70 | */ | |
ce9adaa5 CM |
71 | struct end_io_wq { |
72 | struct bio *bio; | |
73 | bio_end_io_t *end_io; | |
74 | void *private; | |
75 | struct btrfs_fs_info *info; | |
76 | int error; | |
22c59948 | 77 | int metadata; |
ce9adaa5 | 78 | struct list_head list; |
8b712842 | 79 | struct btrfs_work work; |
ce9adaa5 | 80 | }; |
0da5468f | 81 | |
d352ac68 CM |
82 | /* |
83 | * async submit bios are used to offload expensive checksumming | |
84 | * onto the worker threads. They checksum file and metadata bios | |
85 | * just before they are sent down the IO stack. | |
86 | */ | |
44b8bd7e CM |
87 | struct async_submit_bio { |
88 | struct inode *inode; | |
89 | struct bio *bio; | |
90 | struct list_head list; | |
4a69a410 CM |
91 | extent_submit_bio_hook_t *submit_bio_start; |
92 | extent_submit_bio_hook_t *submit_bio_done; | |
44b8bd7e CM |
93 | int rw; |
94 | int mirror_num; | |
c8b97818 | 95 | unsigned long bio_flags; |
eaf25d93 CM |
96 | /* |
97 | * bio_offset is optional, can be used if the pages in the bio | |
98 | * can't tell us where in the file the bio should go | |
99 | */ | |
100 | u64 bio_offset; | |
8b712842 | 101 | struct btrfs_work work; |
44b8bd7e CM |
102 | }; |
103 | ||
85d4e461 CM |
104 | /* |
105 | * Lockdep class keys for extent_buffer->lock's in this root. For a given | |
106 | * eb, the lockdep key is determined by the btrfs_root it belongs to and | |
107 | * the level the eb occupies in the tree. | |
108 | * | |
109 | * Different roots are used for different purposes and may nest inside each | |
110 | * other and they require separate keysets. As lockdep keys should be | |
111 | * static, assign keysets according to the purpose of the root as indicated | |
112 | * by btrfs_root->objectid. This ensures that all special purpose roots | |
113 | * have separate keysets. | |
4008c04a | 114 | * |
85d4e461 CM |
115 | * Lock-nesting across peer nodes is always done with the immediate parent |
116 | * node locked thus preventing deadlock. As lockdep doesn't know this, use | |
117 | * subclass to avoid triggering lockdep warning in such cases. | |
4008c04a | 118 | * |
85d4e461 CM |
119 | * The key is set by the readpage_end_io_hook after the buffer has passed |
120 | * csum validation but before the pages are unlocked. It is also set by | |
121 | * btrfs_init_new_buffer on freshly allocated blocks. | |
4008c04a | 122 | * |
85d4e461 CM |
123 | * We also add a check to make sure the highest level of the tree is the |
124 | * same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this code | |
125 | * needs update as well. | |
4008c04a CM |
126 | */ |
127 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
128 | # if BTRFS_MAX_LEVEL != 8 | |
129 | # error | |
130 | # endif | |
85d4e461 CM |
131 | |
132 | static struct btrfs_lockdep_keyset { | |
133 | u64 id; /* root objectid */ | |
134 | const char *name_stem; /* lock name stem */ | |
135 | char names[BTRFS_MAX_LEVEL + 1][20]; | |
136 | struct lock_class_key keys[BTRFS_MAX_LEVEL + 1]; | |
137 | } btrfs_lockdep_keysets[] = { | |
138 | { .id = BTRFS_ROOT_TREE_OBJECTID, .name_stem = "root" }, | |
139 | { .id = BTRFS_EXTENT_TREE_OBJECTID, .name_stem = "extent" }, | |
140 | { .id = BTRFS_CHUNK_TREE_OBJECTID, .name_stem = "chunk" }, | |
141 | { .id = BTRFS_DEV_TREE_OBJECTID, .name_stem = "dev" }, | |
142 | { .id = BTRFS_FS_TREE_OBJECTID, .name_stem = "fs" }, | |
143 | { .id = BTRFS_CSUM_TREE_OBJECTID, .name_stem = "csum" }, | |
144 | { .id = BTRFS_ORPHAN_OBJECTID, .name_stem = "orphan" }, | |
145 | { .id = BTRFS_TREE_LOG_OBJECTID, .name_stem = "log" }, | |
146 | { .id = BTRFS_TREE_RELOC_OBJECTID, .name_stem = "treloc" }, | |
147 | { .id = BTRFS_DATA_RELOC_TREE_OBJECTID, .name_stem = "dreloc" }, | |
148 | { .id = 0, .name_stem = "tree" }, | |
4008c04a | 149 | }; |
85d4e461 CM |
150 | |
151 | void __init btrfs_init_lockdep(void) | |
152 | { | |
153 | int i, j; | |
154 | ||
155 | /* initialize lockdep class names */ | |
156 | for (i = 0; i < ARRAY_SIZE(btrfs_lockdep_keysets); i++) { | |
157 | struct btrfs_lockdep_keyset *ks = &btrfs_lockdep_keysets[i]; | |
158 | ||
159 | for (j = 0; j < ARRAY_SIZE(ks->names); j++) | |
160 | snprintf(ks->names[j], sizeof(ks->names[j]), | |
161 | "btrfs-%s-%02d", ks->name_stem, j); | |
162 | } | |
163 | } | |
164 | ||
165 | void btrfs_set_buffer_lockdep_class(u64 objectid, struct extent_buffer *eb, | |
166 | int level) | |
167 | { | |
168 | struct btrfs_lockdep_keyset *ks; | |
169 | ||
170 | BUG_ON(level >= ARRAY_SIZE(ks->keys)); | |
171 | ||
172 | /* find the matching keyset, id 0 is the default entry */ | |
173 | for (ks = btrfs_lockdep_keysets; ks->id; ks++) | |
174 | if (ks->id == objectid) | |
175 | break; | |
176 | ||
177 | lockdep_set_class_and_name(&eb->lock, | |
178 | &ks->keys[level], ks->names[level]); | |
179 | } | |
180 | ||
4008c04a CM |
181 | #endif |
182 | ||
d352ac68 CM |
183 | /* |
184 | * extents on the btree inode are pretty simple, there's one extent | |
185 | * that covers the entire device | |
186 | */ | |
b2950863 | 187 | static struct extent_map *btree_get_extent(struct inode *inode, |
306e16ce | 188 | struct page *page, size_t pg_offset, u64 start, u64 len, |
b2950863 | 189 | int create) |
7eccb903 | 190 | { |
5f39d397 CM |
191 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
192 | struct extent_map *em; | |
193 | int ret; | |
194 | ||
890871be | 195 | read_lock(&em_tree->lock); |
d1310b2e | 196 | em = lookup_extent_mapping(em_tree, start, len); |
a061fc8d CM |
197 | if (em) { |
198 | em->bdev = | |
199 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; | |
890871be | 200 | read_unlock(&em_tree->lock); |
5f39d397 | 201 | goto out; |
a061fc8d | 202 | } |
890871be | 203 | read_unlock(&em_tree->lock); |
7b13b7b1 | 204 | |
172ddd60 | 205 | em = alloc_extent_map(); |
5f39d397 CM |
206 | if (!em) { |
207 | em = ERR_PTR(-ENOMEM); | |
208 | goto out; | |
209 | } | |
210 | em->start = 0; | |
0afbaf8c | 211 | em->len = (u64)-1; |
c8b97818 | 212 | em->block_len = (u64)-1; |
5f39d397 | 213 | em->block_start = 0; |
a061fc8d | 214 | em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; |
d1310b2e | 215 | |
890871be | 216 | write_lock(&em_tree->lock); |
5f39d397 CM |
217 | ret = add_extent_mapping(em_tree, em); |
218 | if (ret == -EEXIST) { | |
0afbaf8c CM |
219 | u64 failed_start = em->start; |
220 | u64 failed_len = em->len; | |
221 | ||
5f39d397 | 222 | free_extent_map(em); |
7b13b7b1 | 223 | em = lookup_extent_mapping(em_tree, start, len); |
0afbaf8c | 224 | if (em) { |
7b13b7b1 | 225 | ret = 0; |
0afbaf8c CM |
226 | } else { |
227 | em = lookup_extent_mapping(em_tree, failed_start, | |
228 | failed_len); | |
7b13b7b1 | 229 | ret = -EIO; |
0afbaf8c | 230 | } |
5f39d397 | 231 | } else if (ret) { |
7b13b7b1 CM |
232 | free_extent_map(em); |
233 | em = NULL; | |
5f39d397 | 234 | } |
890871be | 235 | write_unlock(&em_tree->lock); |
7b13b7b1 CM |
236 | |
237 | if (ret) | |
238 | em = ERR_PTR(ret); | |
5f39d397 CM |
239 | out: |
240 | return em; | |
7eccb903 CM |
241 | } |
242 | ||
19c00ddc CM |
243 | u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len) |
244 | { | |
163e783e | 245 | return crc32c(seed, data, len); |
19c00ddc CM |
246 | } |
247 | ||
248 | void btrfs_csum_final(u32 crc, char *result) | |
249 | { | |
7e75bf3f | 250 | put_unaligned_le32(~crc, result); |
19c00ddc CM |
251 | } |
252 | ||
d352ac68 CM |
253 | /* |
254 | * compute the csum for a btree block, and either verify it or write it | |
255 | * into the csum field of the block. | |
256 | */ | |
19c00ddc CM |
257 | static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, |
258 | int verify) | |
259 | { | |
6c41761f | 260 | u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy); |
607d432d | 261 | char *result = NULL; |
19c00ddc CM |
262 | unsigned long len; |
263 | unsigned long cur_len; | |
264 | unsigned long offset = BTRFS_CSUM_SIZE; | |
19c00ddc CM |
265 | char *kaddr; |
266 | unsigned long map_start; | |
267 | unsigned long map_len; | |
268 | int err; | |
269 | u32 crc = ~(u32)0; | |
607d432d | 270 | unsigned long inline_result; |
19c00ddc CM |
271 | |
272 | len = buf->len - offset; | |
d397712b | 273 | while (len > 0) { |
19c00ddc | 274 | err = map_private_extent_buffer(buf, offset, 32, |
a6591715 | 275 | &kaddr, &map_start, &map_len); |
d397712b | 276 | if (err) |
19c00ddc | 277 | return 1; |
19c00ddc CM |
278 | cur_len = min(len, map_len - (offset - map_start)); |
279 | crc = btrfs_csum_data(root, kaddr + offset - map_start, | |
280 | crc, cur_len); | |
281 | len -= cur_len; | |
282 | offset += cur_len; | |
19c00ddc | 283 | } |
607d432d JB |
284 | if (csum_size > sizeof(inline_result)) { |
285 | result = kzalloc(csum_size * sizeof(char), GFP_NOFS); | |
286 | if (!result) | |
287 | return 1; | |
288 | } else { | |
289 | result = (char *)&inline_result; | |
290 | } | |
291 | ||
19c00ddc CM |
292 | btrfs_csum_final(crc, result); |
293 | ||
294 | if (verify) { | |
607d432d | 295 | if (memcmp_extent_buffer(buf, result, 0, csum_size)) { |
e4204ded CM |
296 | u32 val; |
297 | u32 found = 0; | |
607d432d | 298 | memcpy(&found, result, csum_size); |
e4204ded | 299 | |
607d432d | 300 | read_extent_buffer(buf, &val, 0, csum_size); |
7a36ddec | 301 | printk_ratelimited(KERN_INFO "btrfs: %s checksum verify " |
193f284d CM |
302 | "failed on %llu wanted %X found %X " |
303 | "level %d\n", | |
304 | root->fs_info->sb->s_id, | |
305 | (unsigned long long)buf->start, val, found, | |
306 | btrfs_header_level(buf)); | |
607d432d JB |
307 | if (result != (char *)&inline_result) |
308 | kfree(result); | |
19c00ddc CM |
309 | return 1; |
310 | } | |
311 | } else { | |
607d432d | 312 | write_extent_buffer(buf, result, 0, csum_size); |
19c00ddc | 313 | } |
607d432d JB |
314 | if (result != (char *)&inline_result) |
315 | kfree(result); | |
19c00ddc CM |
316 | return 0; |
317 | } | |
318 | ||
d352ac68 CM |
319 | /* |
320 | * we can't consider a given block up to date unless the transid of the | |
321 | * block matches the transid in the parent node's pointer. This is how we | |
322 | * detect blocks that either didn't get written at all or got written | |
323 | * in the wrong place. | |
324 | */ | |
1259ab75 CM |
325 | static int verify_parent_transid(struct extent_io_tree *io_tree, |
326 | struct extent_buffer *eb, u64 parent_transid) | |
327 | { | |
2ac55d41 | 328 | struct extent_state *cached_state = NULL; |
1259ab75 CM |
329 | int ret; |
330 | ||
331 | if (!parent_transid || btrfs_header_generation(eb) == parent_transid) | |
332 | return 0; | |
333 | ||
2ac55d41 JB |
334 | lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1, |
335 | 0, &cached_state, GFP_NOFS); | |
0b32f4bb | 336 | if (extent_buffer_uptodate(eb) && |
1259ab75 CM |
337 | btrfs_header_generation(eb) == parent_transid) { |
338 | ret = 0; | |
339 | goto out; | |
340 | } | |
7a36ddec | 341 | printk_ratelimited("parent transid verify failed on %llu wanted %llu " |
193f284d CM |
342 | "found %llu\n", |
343 | (unsigned long long)eb->start, | |
344 | (unsigned long long)parent_transid, | |
345 | (unsigned long long)btrfs_header_generation(eb)); | |
1259ab75 | 346 | ret = 1; |
0b32f4bb | 347 | clear_extent_buffer_uptodate(eb); |
33958dc6 | 348 | out: |
2ac55d41 JB |
349 | unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1, |
350 | &cached_state, GFP_NOFS); | |
1259ab75 | 351 | return ret; |
1259ab75 CM |
352 | } |
353 | ||
d352ac68 CM |
354 | /* |
355 | * helper to read a given tree block, doing retries as required when | |
356 | * the checksums don't match and we have alternate mirrors to try. | |
357 | */ | |
f188591e CM |
358 | static int btree_read_extent_buffer_pages(struct btrfs_root *root, |
359 | struct extent_buffer *eb, | |
ca7a79ad | 360 | u64 start, u64 parent_transid) |
f188591e CM |
361 | { |
362 | struct extent_io_tree *io_tree; | |
ea466794 | 363 | int failed = 0; |
f188591e CM |
364 | int ret; |
365 | int num_copies = 0; | |
366 | int mirror_num = 0; | |
ea466794 | 367 | int failed_mirror = 0; |
f188591e | 368 | |
a826d6dc | 369 | clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); |
f188591e CM |
370 | io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; |
371 | while (1) { | |
bb82ab88 AJ |
372 | ret = read_extent_buffer_pages(io_tree, eb, start, |
373 | WAIT_COMPLETE, | |
f188591e | 374 | btree_get_extent, mirror_num); |
727011e0 | 375 | if (!ret && !verify_parent_transid(io_tree, eb, parent_transid)) |
ea466794 | 376 | break; |
d397712b | 377 | |
a826d6dc JB |
378 | /* |
379 | * This buffer's crc is fine, but its contents are corrupted, so | |
380 | * there is no reason to read the other copies, they won't be | |
381 | * any less wrong. | |
382 | */ | |
383 | if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags)) | |
ea466794 JB |
384 | break; |
385 | ||
386 | if (!failed_mirror) { | |
387 | failed = 1; | |
388 | printk(KERN_ERR "failed mirror was %d\n", eb->failed_mirror); | |
389 | failed_mirror = eb->failed_mirror; | |
390 | } | |
a826d6dc | 391 | |
f188591e CM |
392 | num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, |
393 | eb->start, eb->len); | |
4235298e | 394 | if (num_copies == 1) |
ea466794 | 395 | break; |
4235298e | 396 | |
f188591e | 397 | mirror_num++; |
ea466794 JB |
398 | if (mirror_num == failed_mirror) |
399 | mirror_num++; | |
400 | ||
4235298e | 401 | if (mirror_num > num_copies) |
ea466794 | 402 | break; |
f188591e | 403 | } |
ea466794 JB |
404 | |
405 | if (failed && !ret) | |
406 | repair_eb_io_failure(root, eb, failed_mirror); | |
407 | ||
408 | return ret; | |
f188591e | 409 | } |
19c00ddc | 410 | |
d352ac68 | 411 | /* |
d397712b CM |
412 | * checksum a dirty tree block before IO. This has extra checks to make sure |
413 | * we only fill in the checksum field in the first page of a multi-page block | |
d352ac68 | 414 | */ |
d397712b | 415 | |
b2950863 | 416 | static int csum_dirty_buffer(struct btrfs_root *root, struct page *page) |
19c00ddc | 417 | { |
d1310b2e | 418 | struct extent_io_tree *tree; |
35ebb934 | 419 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
19c00ddc | 420 | u64 found_start; |
19c00ddc | 421 | struct extent_buffer *eb; |
f188591e | 422 | |
d1310b2e | 423 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
19c00ddc | 424 | |
4f2de97a JB |
425 | eb = (struct extent_buffer *)page->private; |
426 | if (page != eb->pages[0]) | |
427 | return 0; | |
784b4e29 | 428 | |
19c00ddc CM |
429 | found_start = btrfs_header_bytenr(eb); |
430 | if (found_start != start) { | |
55c69072 | 431 | WARN_ON(1); |
4f2de97a | 432 | return 0; |
55c69072 | 433 | } |
727011e0 | 434 | if (eb->pages[0] != page) { |
55c69072 | 435 | WARN_ON(1); |
4f2de97a | 436 | return 0; |
55c69072 CM |
437 | } |
438 | if (!PageUptodate(page)) { | |
55c69072 | 439 | WARN_ON(1); |
4f2de97a | 440 | return 0; |
19c00ddc | 441 | } |
19c00ddc | 442 | csum_tree_block(root, eb, 0); |
19c00ddc CM |
443 | return 0; |
444 | } | |
445 | ||
2b82032c YZ |
446 | static int check_tree_block_fsid(struct btrfs_root *root, |
447 | struct extent_buffer *eb) | |
448 | { | |
449 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
450 | u8 fsid[BTRFS_UUID_SIZE]; | |
451 | int ret = 1; | |
452 | ||
453 | read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb), | |
454 | BTRFS_FSID_SIZE); | |
455 | while (fs_devices) { | |
456 | if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) { | |
457 | ret = 0; | |
458 | break; | |
459 | } | |
460 | fs_devices = fs_devices->seed; | |
461 | } | |
462 | return ret; | |
463 | } | |
464 | ||
a826d6dc JB |
465 | #define CORRUPT(reason, eb, root, slot) \ |
466 | printk(KERN_CRIT "btrfs: corrupt leaf, %s: block=%llu," \ | |
467 | "root=%llu, slot=%d\n", reason, \ | |
468 | (unsigned long long)btrfs_header_bytenr(eb), \ | |
469 | (unsigned long long)root->objectid, slot) | |
470 | ||
471 | static noinline int check_leaf(struct btrfs_root *root, | |
472 | struct extent_buffer *leaf) | |
473 | { | |
474 | struct btrfs_key key; | |
475 | struct btrfs_key leaf_key; | |
476 | u32 nritems = btrfs_header_nritems(leaf); | |
477 | int slot; | |
478 | ||
479 | if (nritems == 0) | |
480 | return 0; | |
481 | ||
482 | /* Check the 0 item */ | |
483 | if (btrfs_item_offset_nr(leaf, 0) + btrfs_item_size_nr(leaf, 0) != | |
484 | BTRFS_LEAF_DATA_SIZE(root)) { | |
485 | CORRUPT("invalid item offset size pair", leaf, root, 0); | |
486 | return -EIO; | |
487 | } | |
488 | ||
489 | /* | |
490 | * Check to make sure each items keys are in the correct order and their | |
491 | * offsets make sense. We only have to loop through nritems-1 because | |
492 | * we check the current slot against the next slot, which verifies the | |
493 | * next slot's offset+size makes sense and that the current's slot | |
494 | * offset is correct. | |
495 | */ | |
496 | for (slot = 0; slot < nritems - 1; slot++) { | |
497 | btrfs_item_key_to_cpu(leaf, &leaf_key, slot); | |
498 | btrfs_item_key_to_cpu(leaf, &key, slot + 1); | |
499 | ||
500 | /* Make sure the keys are in the right order */ | |
501 | if (btrfs_comp_cpu_keys(&leaf_key, &key) >= 0) { | |
502 | CORRUPT("bad key order", leaf, root, slot); | |
503 | return -EIO; | |
504 | } | |
505 | ||
506 | /* | |
507 | * Make sure the offset and ends are right, remember that the | |
508 | * item data starts at the end of the leaf and grows towards the | |
509 | * front. | |
510 | */ | |
511 | if (btrfs_item_offset_nr(leaf, slot) != | |
512 | btrfs_item_end_nr(leaf, slot + 1)) { | |
513 | CORRUPT("slot offset bad", leaf, root, slot); | |
514 | return -EIO; | |
515 | } | |
516 | ||
517 | /* | |
518 | * Check to make sure that we don't point outside of the leaf, | |
519 | * just incase all the items are consistent to eachother, but | |
520 | * all point outside of the leaf. | |
521 | */ | |
522 | if (btrfs_item_end_nr(leaf, slot) > | |
523 | BTRFS_LEAF_DATA_SIZE(root)) { | |
524 | CORRUPT("slot end outside of leaf", leaf, root, slot); | |
525 | return -EIO; | |
526 | } | |
527 | } | |
528 | ||
529 | return 0; | |
530 | } | |
531 | ||
727011e0 CM |
532 | struct extent_buffer *find_eb_for_page(struct extent_io_tree *tree, |
533 | struct page *page, int max_walk) | |
534 | { | |
535 | struct extent_buffer *eb; | |
536 | u64 start = page_offset(page); | |
537 | u64 target = start; | |
538 | u64 min_start; | |
539 | ||
540 | if (start < max_walk) | |
541 | min_start = 0; | |
542 | else | |
543 | min_start = start - max_walk; | |
544 | ||
545 | while (start >= min_start) { | |
546 | eb = find_extent_buffer(tree, start, 0); | |
547 | if (eb) { | |
548 | /* | |
549 | * we found an extent buffer and it contains our page | |
550 | * horray! | |
551 | */ | |
552 | if (eb->start <= target && | |
553 | eb->start + eb->len > target) | |
554 | return eb; | |
555 | ||
556 | /* we found an extent buffer that wasn't for us */ | |
557 | free_extent_buffer(eb); | |
558 | return NULL; | |
559 | } | |
560 | if (start == 0) | |
561 | break; | |
562 | start -= PAGE_CACHE_SIZE; | |
563 | } | |
564 | return NULL; | |
565 | } | |
566 | ||
b2950863 | 567 | static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
ce9adaa5 CM |
568 | struct extent_state *state) |
569 | { | |
570 | struct extent_io_tree *tree; | |
571 | u64 found_start; | |
572 | int found_level; | |
ce9adaa5 CM |
573 | struct extent_buffer *eb; |
574 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
f188591e | 575 | int ret = 0; |
727011e0 | 576 | int reads_done; |
ce9adaa5 | 577 | |
ce9adaa5 CM |
578 | if (!page->private) |
579 | goto out; | |
d397712b | 580 | |
727011e0 | 581 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
4f2de97a | 582 | eb = (struct extent_buffer *)page->private; |
d397712b | 583 | |
0b32f4bb JB |
584 | /* the pending IO might have been the only thing that kept this buffer |
585 | * in memory. Make sure we have a ref for all this other checks | |
586 | */ | |
587 | extent_buffer_get(eb); | |
588 | ||
589 | reads_done = atomic_dec_and_test(&eb->io_pages); | |
727011e0 CM |
590 | if (!reads_done) |
591 | goto err; | |
f188591e | 592 | |
ea466794 JB |
593 | if (test_bit(EXTENT_BUFFER_IOERR, &eb->bflags)) { |
594 | ret = -EIO; | |
595 | goto err; | |
596 | } | |
597 | ||
ce9adaa5 | 598 | found_start = btrfs_header_bytenr(eb); |
727011e0 | 599 | if (found_start != eb->start) { |
7a36ddec | 600 | printk_ratelimited(KERN_INFO "btrfs bad tree block start " |
193f284d CM |
601 | "%llu %llu\n", |
602 | (unsigned long long)found_start, | |
603 | (unsigned long long)eb->start); | |
f188591e | 604 | ret = -EIO; |
ce9adaa5 CM |
605 | goto err; |
606 | } | |
2b82032c | 607 | if (check_tree_block_fsid(root, eb)) { |
7a36ddec | 608 | printk_ratelimited(KERN_INFO "btrfs bad fsid on block %llu\n", |
193f284d | 609 | (unsigned long long)eb->start); |
1259ab75 CM |
610 | ret = -EIO; |
611 | goto err; | |
612 | } | |
ce9adaa5 CM |
613 | found_level = btrfs_header_level(eb); |
614 | ||
85d4e461 CM |
615 | btrfs_set_buffer_lockdep_class(btrfs_header_owner(eb), |
616 | eb, found_level); | |
4008c04a | 617 | |
ce9adaa5 | 618 | ret = csum_tree_block(root, eb, 1); |
a826d6dc | 619 | if (ret) { |
f188591e | 620 | ret = -EIO; |
a826d6dc JB |
621 | goto err; |
622 | } | |
623 | ||
624 | /* | |
625 | * If this is a leaf block and it is corrupt, set the corrupt bit so | |
626 | * that we don't try and read the other copies of this block, just | |
627 | * return -EIO. | |
628 | */ | |
629 | if (found_level == 0 && check_leaf(root, eb)) { | |
630 | set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); | |
631 | ret = -EIO; | |
632 | } | |
ce9adaa5 | 633 | |
0b32f4bb JB |
634 | if (!ret) |
635 | set_extent_buffer_uptodate(eb); | |
ce9adaa5 | 636 | err: |
4bb31e92 AJ |
637 | if (test_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags)) { |
638 | clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags); | |
639 | btree_readahead_hook(root, eb, eb->start, ret); | |
640 | } | |
641 | ||
0b32f4bb JB |
642 | if (ret) |
643 | clear_extent_buffer_uptodate(eb); | |
644 | free_extent_buffer(eb); | |
ce9adaa5 | 645 | out: |
f188591e | 646 | return ret; |
ce9adaa5 CM |
647 | } |
648 | ||
ea466794 | 649 | static int btree_io_failed_hook(struct page *page, int failed_mirror) |
4bb31e92 | 650 | { |
4bb31e92 AJ |
651 | struct extent_buffer *eb; |
652 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
653 | ||
4f2de97a | 654 | eb = (struct extent_buffer *)page->private; |
ea466794 JB |
655 | set_bit(EXTENT_BUFFER_IOERR, &eb->bflags); |
656 | eb->failed_mirror = failed_mirror; | |
657 | if (test_and_clear_bit(EXTENT_BUFFER_READAHEAD, &eb->bflags)) | |
4bb31e92 | 658 | btree_readahead_hook(root, eb, eb->start, -EIO); |
4bb31e92 AJ |
659 | return -EIO; /* we fixed nothing */ |
660 | } | |
661 | ||
ce9adaa5 | 662 | static void end_workqueue_bio(struct bio *bio, int err) |
ce9adaa5 CM |
663 | { |
664 | struct end_io_wq *end_io_wq = bio->bi_private; | |
665 | struct btrfs_fs_info *fs_info; | |
ce9adaa5 | 666 | |
ce9adaa5 | 667 | fs_info = end_io_wq->info; |
ce9adaa5 | 668 | end_io_wq->error = err; |
8b712842 CM |
669 | end_io_wq->work.func = end_workqueue_fn; |
670 | end_io_wq->work.flags = 0; | |
d20f7043 | 671 | |
7b6d91da | 672 | if (bio->bi_rw & REQ_WRITE) { |
0cb59c99 | 673 | if (end_io_wq->metadata == 1) |
cad321ad CM |
674 | btrfs_queue_worker(&fs_info->endio_meta_write_workers, |
675 | &end_io_wq->work); | |
0cb59c99 JB |
676 | else if (end_io_wq->metadata == 2) |
677 | btrfs_queue_worker(&fs_info->endio_freespace_worker, | |
678 | &end_io_wq->work); | |
cad321ad CM |
679 | else |
680 | btrfs_queue_worker(&fs_info->endio_write_workers, | |
681 | &end_io_wq->work); | |
d20f7043 CM |
682 | } else { |
683 | if (end_io_wq->metadata) | |
684 | btrfs_queue_worker(&fs_info->endio_meta_workers, | |
685 | &end_io_wq->work); | |
686 | else | |
687 | btrfs_queue_worker(&fs_info->endio_workers, | |
688 | &end_io_wq->work); | |
689 | } | |
ce9adaa5 CM |
690 | } |
691 | ||
0cb59c99 JB |
692 | /* |
693 | * For the metadata arg you want | |
694 | * | |
695 | * 0 - if data | |
696 | * 1 - if normal metadta | |
697 | * 2 - if writing to the free space cache area | |
698 | */ | |
22c59948 CM |
699 | int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, |
700 | int metadata) | |
0b86a832 | 701 | { |
ce9adaa5 | 702 | struct end_io_wq *end_io_wq; |
ce9adaa5 CM |
703 | end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS); |
704 | if (!end_io_wq) | |
705 | return -ENOMEM; | |
706 | ||
707 | end_io_wq->private = bio->bi_private; | |
708 | end_io_wq->end_io = bio->bi_end_io; | |
22c59948 | 709 | end_io_wq->info = info; |
ce9adaa5 CM |
710 | end_io_wq->error = 0; |
711 | end_io_wq->bio = bio; | |
22c59948 | 712 | end_io_wq->metadata = metadata; |
ce9adaa5 CM |
713 | |
714 | bio->bi_private = end_io_wq; | |
715 | bio->bi_end_io = end_workqueue_bio; | |
22c59948 CM |
716 | return 0; |
717 | } | |
718 | ||
b64a2851 | 719 | unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info) |
0986fe9e | 720 | { |
4854ddd0 CM |
721 | unsigned long limit = min_t(unsigned long, |
722 | info->workers.max_workers, | |
723 | info->fs_devices->open_devices); | |
724 | return 256 * limit; | |
725 | } | |
0986fe9e | 726 | |
4a69a410 CM |
727 | static void run_one_async_start(struct btrfs_work *work) |
728 | { | |
4a69a410 CM |
729 | struct async_submit_bio *async; |
730 | ||
731 | async = container_of(work, struct async_submit_bio, work); | |
4a69a410 | 732 | async->submit_bio_start(async->inode, async->rw, async->bio, |
eaf25d93 CM |
733 | async->mirror_num, async->bio_flags, |
734 | async->bio_offset); | |
4a69a410 CM |
735 | } |
736 | ||
737 | static void run_one_async_done(struct btrfs_work *work) | |
8b712842 CM |
738 | { |
739 | struct btrfs_fs_info *fs_info; | |
740 | struct async_submit_bio *async; | |
4854ddd0 | 741 | int limit; |
8b712842 CM |
742 | |
743 | async = container_of(work, struct async_submit_bio, work); | |
744 | fs_info = BTRFS_I(async->inode)->root->fs_info; | |
4854ddd0 | 745 | |
b64a2851 | 746 | limit = btrfs_async_submit_limit(fs_info); |
4854ddd0 CM |
747 | limit = limit * 2 / 3; |
748 | ||
8b712842 | 749 | atomic_dec(&fs_info->nr_async_submits); |
0986fe9e | 750 | |
b64a2851 CM |
751 | if (atomic_read(&fs_info->nr_async_submits) < limit && |
752 | waitqueue_active(&fs_info->async_submit_wait)) | |
4854ddd0 CM |
753 | wake_up(&fs_info->async_submit_wait); |
754 | ||
4a69a410 | 755 | async->submit_bio_done(async->inode, async->rw, async->bio, |
eaf25d93 CM |
756 | async->mirror_num, async->bio_flags, |
757 | async->bio_offset); | |
4a69a410 CM |
758 | } |
759 | ||
760 | static void run_one_async_free(struct btrfs_work *work) | |
761 | { | |
762 | struct async_submit_bio *async; | |
763 | ||
764 | async = container_of(work, struct async_submit_bio, work); | |
8b712842 CM |
765 | kfree(async); |
766 | } | |
767 | ||
44b8bd7e CM |
768 | int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, |
769 | int rw, struct bio *bio, int mirror_num, | |
c8b97818 | 770 | unsigned long bio_flags, |
eaf25d93 | 771 | u64 bio_offset, |
4a69a410 CM |
772 | extent_submit_bio_hook_t *submit_bio_start, |
773 | extent_submit_bio_hook_t *submit_bio_done) | |
44b8bd7e CM |
774 | { |
775 | struct async_submit_bio *async; | |
776 | ||
777 | async = kmalloc(sizeof(*async), GFP_NOFS); | |
778 | if (!async) | |
779 | return -ENOMEM; | |
780 | ||
781 | async->inode = inode; | |
782 | async->rw = rw; | |
783 | async->bio = bio; | |
784 | async->mirror_num = mirror_num; | |
4a69a410 CM |
785 | async->submit_bio_start = submit_bio_start; |
786 | async->submit_bio_done = submit_bio_done; | |
787 | ||
788 | async->work.func = run_one_async_start; | |
789 | async->work.ordered_func = run_one_async_done; | |
790 | async->work.ordered_free = run_one_async_free; | |
791 | ||
8b712842 | 792 | async->work.flags = 0; |
c8b97818 | 793 | async->bio_flags = bio_flags; |
eaf25d93 | 794 | async->bio_offset = bio_offset; |
8c8bee1d | 795 | |
cb03c743 | 796 | atomic_inc(&fs_info->nr_async_submits); |
d313d7a3 | 797 | |
7b6d91da | 798 | if (rw & REQ_SYNC) |
d313d7a3 CM |
799 | btrfs_set_work_high_prio(&async->work); |
800 | ||
8b712842 | 801 | btrfs_queue_worker(&fs_info->workers, &async->work); |
9473f16c | 802 | |
d397712b | 803 | while (atomic_read(&fs_info->async_submit_draining) && |
771ed689 CM |
804 | atomic_read(&fs_info->nr_async_submits)) { |
805 | wait_event(fs_info->async_submit_wait, | |
806 | (atomic_read(&fs_info->nr_async_submits) == 0)); | |
807 | } | |
808 | ||
44b8bd7e CM |
809 | return 0; |
810 | } | |
811 | ||
ce3ed71a CM |
812 | static int btree_csum_one_bio(struct bio *bio) |
813 | { | |
814 | struct bio_vec *bvec = bio->bi_io_vec; | |
815 | int bio_index = 0; | |
816 | struct btrfs_root *root; | |
817 | ||
818 | WARN_ON(bio->bi_vcnt <= 0); | |
d397712b | 819 | while (bio_index < bio->bi_vcnt) { |
ce3ed71a CM |
820 | root = BTRFS_I(bvec->bv_page->mapping->host)->root; |
821 | csum_dirty_buffer(root, bvec->bv_page); | |
822 | bio_index++; | |
823 | bvec++; | |
824 | } | |
825 | return 0; | |
826 | } | |
827 | ||
4a69a410 CM |
828 | static int __btree_submit_bio_start(struct inode *inode, int rw, |
829 | struct bio *bio, int mirror_num, | |
eaf25d93 CM |
830 | unsigned long bio_flags, |
831 | u64 bio_offset) | |
22c59948 | 832 | { |
8b712842 CM |
833 | /* |
834 | * when we're called for a write, we're already in the async | |
5443be45 | 835 | * submission context. Just jump into btrfs_map_bio |
8b712842 | 836 | */ |
4a69a410 CM |
837 | btree_csum_one_bio(bio); |
838 | return 0; | |
839 | } | |
22c59948 | 840 | |
4a69a410 | 841 | static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
842 | int mirror_num, unsigned long bio_flags, |
843 | u64 bio_offset) | |
4a69a410 | 844 | { |
8b712842 | 845 | /* |
4a69a410 CM |
846 | * when we're called for a write, we're already in the async |
847 | * submission context. Just jump into btrfs_map_bio | |
8b712842 | 848 | */ |
8b712842 | 849 | return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1); |
0b86a832 CM |
850 | } |
851 | ||
44b8bd7e | 852 | static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
853 | int mirror_num, unsigned long bio_flags, |
854 | u64 bio_offset) | |
44b8bd7e | 855 | { |
cad321ad CM |
856 | int ret; |
857 | ||
7b6d91da | 858 | if (!(rw & REQ_WRITE)) { |
f3f266ab | 859 | |
4a69a410 CM |
860 | /* |
861 | * called for a read, do the setup so that checksum validation | |
862 | * can happen in the async kernel threads | |
863 | */ | |
f3f266ab CM |
864 | ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info, |
865 | bio, 1); | |
866 | BUG_ON(ret); | |
4a69a410 | 867 | return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, |
6f3577bd | 868 | mirror_num, 0); |
44b8bd7e | 869 | } |
d313d7a3 | 870 | |
cad321ad CM |
871 | /* |
872 | * kthread helpers are used to submit writes so that checksumming | |
873 | * can happen in parallel across all CPUs | |
874 | */ | |
44b8bd7e | 875 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
c8b97818 | 876 | inode, rw, bio, mirror_num, 0, |
eaf25d93 | 877 | bio_offset, |
4a69a410 CM |
878 | __btree_submit_bio_start, |
879 | __btree_submit_bio_done); | |
44b8bd7e CM |
880 | } |
881 | ||
3dd1462e | 882 | #ifdef CONFIG_MIGRATION |
784b4e29 | 883 | static int btree_migratepage(struct address_space *mapping, |
a6bc32b8 MG |
884 | struct page *newpage, struct page *page, |
885 | enum migrate_mode mode) | |
784b4e29 CM |
886 | { |
887 | /* | |
888 | * we can't safely write a btree page from here, | |
889 | * we haven't done the locking hook | |
890 | */ | |
891 | if (PageDirty(page)) | |
892 | return -EAGAIN; | |
893 | /* | |
894 | * Buffers may be managed in a filesystem specific way. | |
895 | * We must have no buffers or drop them. | |
896 | */ | |
897 | if (page_has_private(page) && | |
898 | !try_to_release_page(page, GFP_KERNEL)) | |
899 | return -EAGAIN; | |
a6bc32b8 | 900 | return migrate_page(mapping, newpage, page, mode); |
784b4e29 | 901 | } |
3dd1462e | 902 | #endif |
784b4e29 | 903 | |
0da5468f CM |
904 | |
905 | static int btree_writepages(struct address_space *mapping, | |
906 | struct writeback_control *wbc) | |
907 | { | |
d1310b2e CM |
908 | struct extent_io_tree *tree; |
909 | tree = &BTRFS_I(mapping->host)->io_tree; | |
d8d5f3e1 | 910 | if (wbc->sync_mode == WB_SYNC_NONE) { |
b9473439 | 911 | struct btrfs_root *root = BTRFS_I(mapping->host)->root; |
793955bc | 912 | u64 num_dirty; |
24ab9cd8 | 913 | unsigned long thresh = 32 * 1024 * 1024; |
448d640b CM |
914 | |
915 | if (wbc->for_kupdate) | |
916 | return 0; | |
917 | ||
b9473439 CM |
918 | /* this is a bit racy, but that's ok */ |
919 | num_dirty = root->fs_info->dirty_metadata_bytes; | |
d397712b | 920 | if (num_dirty < thresh) |
793955bc | 921 | return 0; |
793955bc | 922 | } |
0b32f4bb | 923 | return btree_write_cache_pages(mapping, wbc); |
0da5468f CM |
924 | } |
925 | ||
b2950863 | 926 | static int btree_readpage(struct file *file, struct page *page) |
5f39d397 | 927 | { |
d1310b2e CM |
928 | struct extent_io_tree *tree; |
929 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
8ddc7d9c | 930 | return extent_read_full_page(tree, page, btree_get_extent, 0); |
5f39d397 | 931 | } |
22b0ebda | 932 | |
70dec807 | 933 | static int btree_releasepage(struct page *page, gfp_t gfp_flags) |
5f39d397 | 934 | { |
98509cfc | 935 | if (PageWriteback(page) || PageDirty(page)) |
d397712b | 936 | return 0; |
0c4e538b DS |
937 | /* |
938 | * We need to mask out eg. __GFP_HIGHMEM and __GFP_DMA32 as we're doing | |
939 | * slab allocation from alloc_extent_state down the callchain where | |
940 | * it'd hit a BUG_ON as those flags are not allowed. | |
941 | */ | |
942 | gfp_flags &= ~GFP_SLAB_BUG_MASK; | |
943 | ||
3083ee2e | 944 | return try_release_extent_buffer(page, gfp_flags); |
d98237b3 CM |
945 | } |
946 | ||
5f39d397 | 947 | static void btree_invalidatepage(struct page *page, unsigned long offset) |
d98237b3 | 948 | { |
d1310b2e CM |
949 | struct extent_io_tree *tree; |
950 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
5f39d397 CM |
951 | extent_invalidatepage(tree, page, offset); |
952 | btree_releasepage(page, GFP_NOFS); | |
9ad6b7bc | 953 | if (PagePrivate(page)) { |
d397712b CM |
954 | printk(KERN_WARNING "btrfs warning page private not zero " |
955 | "on page %llu\n", (unsigned long long)page_offset(page)); | |
9ad6b7bc CM |
956 | ClearPagePrivate(page); |
957 | set_page_private(page, 0); | |
958 | page_cache_release(page); | |
959 | } | |
d98237b3 CM |
960 | } |
961 | ||
0b32f4bb JB |
962 | static int btree_set_page_dirty(struct page *page) |
963 | { | |
964 | struct extent_buffer *eb; | |
965 | ||
966 | BUG_ON(!PagePrivate(page)); | |
967 | eb = (struct extent_buffer *)page->private; | |
968 | BUG_ON(!eb); | |
969 | BUG_ON(!test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); | |
970 | BUG_ON(!atomic_read(&eb->refs)); | |
971 | btrfs_assert_tree_locked(eb); | |
972 | return __set_page_dirty_nobuffers(page); | |
973 | } | |
974 | ||
7f09410b | 975 | static const struct address_space_operations btree_aops = { |
d98237b3 | 976 | .readpage = btree_readpage, |
0da5468f | 977 | .writepages = btree_writepages, |
5f39d397 CM |
978 | .releasepage = btree_releasepage, |
979 | .invalidatepage = btree_invalidatepage, | |
5a92bc88 | 980 | #ifdef CONFIG_MIGRATION |
784b4e29 | 981 | .migratepage = btree_migratepage, |
5a92bc88 | 982 | #endif |
0b32f4bb | 983 | .set_page_dirty = btree_set_page_dirty, |
d98237b3 CM |
984 | }; |
985 | ||
ca7a79ad CM |
986 | int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, |
987 | u64 parent_transid) | |
090d1875 | 988 | { |
5f39d397 CM |
989 | struct extent_buffer *buf = NULL; |
990 | struct inode *btree_inode = root->fs_info->btree_inode; | |
de428b63 | 991 | int ret = 0; |
090d1875 | 992 | |
db94535d | 993 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
5f39d397 | 994 | if (!buf) |
090d1875 | 995 | return 0; |
d1310b2e | 996 | read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, |
bb82ab88 | 997 | buf, 0, WAIT_NONE, btree_get_extent, 0); |
5f39d397 | 998 | free_extent_buffer(buf); |
de428b63 | 999 | return ret; |
090d1875 CM |
1000 | } |
1001 | ||
ab0fff03 AJ |
1002 | int reada_tree_block_flagged(struct btrfs_root *root, u64 bytenr, u32 blocksize, |
1003 | int mirror_num, struct extent_buffer **eb) | |
1004 | { | |
1005 | struct extent_buffer *buf = NULL; | |
1006 | struct inode *btree_inode = root->fs_info->btree_inode; | |
1007 | struct extent_io_tree *io_tree = &BTRFS_I(btree_inode)->io_tree; | |
1008 | int ret; | |
1009 | ||
1010 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
1011 | if (!buf) | |
1012 | return 0; | |
1013 | ||
1014 | set_bit(EXTENT_BUFFER_READAHEAD, &buf->bflags); | |
1015 | ||
1016 | ret = read_extent_buffer_pages(io_tree, buf, 0, WAIT_PAGE_LOCK, | |
1017 | btree_get_extent, mirror_num); | |
1018 | if (ret) { | |
1019 | free_extent_buffer(buf); | |
1020 | return ret; | |
1021 | } | |
1022 | ||
1023 | if (test_bit(EXTENT_BUFFER_CORRUPT, &buf->bflags)) { | |
1024 | free_extent_buffer(buf); | |
1025 | return -EIO; | |
0b32f4bb | 1026 | } else if (extent_buffer_uptodate(buf)) { |
ab0fff03 AJ |
1027 | *eb = buf; |
1028 | } else { | |
1029 | free_extent_buffer(buf); | |
1030 | } | |
1031 | return 0; | |
1032 | } | |
1033 | ||
0999df54 CM |
1034 | struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, |
1035 | u64 bytenr, u32 blocksize) | |
1036 | { | |
1037 | struct inode *btree_inode = root->fs_info->btree_inode; | |
1038 | struct extent_buffer *eb; | |
1039 | eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, | |
f09d1f60 | 1040 | bytenr, blocksize); |
0999df54 CM |
1041 | return eb; |
1042 | } | |
1043 | ||
1044 | struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, | |
1045 | u64 bytenr, u32 blocksize) | |
1046 | { | |
1047 | struct inode *btree_inode = root->fs_info->btree_inode; | |
1048 | struct extent_buffer *eb; | |
1049 | ||
1050 | eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree, | |
727011e0 | 1051 | bytenr, blocksize); |
0999df54 CM |
1052 | return eb; |
1053 | } | |
1054 | ||
1055 | ||
e02119d5 CM |
1056 | int btrfs_write_tree_block(struct extent_buffer *buf) |
1057 | { | |
727011e0 | 1058 | return filemap_fdatawrite_range(buf->pages[0]->mapping, buf->start, |
8aa38c31 | 1059 | buf->start + buf->len - 1); |
e02119d5 CM |
1060 | } |
1061 | ||
1062 | int btrfs_wait_tree_block_writeback(struct extent_buffer *buf) | |
1063 | { | |
727011e0 | 1064 | return filemap_fdatawait_range(buf->pages[0]->mapping, |
8aa38c31 | 1065 | buf->start, buf->start + buf->len - 1); |
e02119d5 CM |
1066 | } |
1067 | ||
0999df54 | 1068 | struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, |
ca7a79ad | 1069 | u32 blocksize, u64 parent_transid) |
0999df54 CM |
1070 | { |
1071 | struct extent_buffer *buf = NULL; | |
0999df54 CM |
1072 | int ret; |
1073 | ||
0999df54 CM |
1074 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
1075 | if (!buf) | |
1076 | return NULL; | |
0999df54 | 1077 | |
ca7a79ad | 1078 | ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); |
5f39d397 | 1079 | return buf; |
ce9adaa5 | 1080 | |
eb60ceac CM |
1081 | } |
1082 | ||
e089f05c | 1083 | int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
5f39d397 | 1084 | struct extent_buffer *buf) |
ed2ff2cb | 1085 | { |
55c69072 | 1086 | if (btrfs_header_generation(buf) == |
925baedd | 1087 | root->fs_info->running_transaction->transid) { |
b9447ef8 | 1088 | btrfs_assert_tree_locked(buf); |
b4ce94de | 1089 | |
b9473439 CM |
1090 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) { |
1091 | spin_lock(&root->fs_info->delalloc_lock); | |
1092 | if (root->fs_info->dirty_metadata_bytes >= buf->len) | |
1093 | root->fs_info->dirty_metadata_bytes -= buf->len; | |
1094 | else | |
1095 | WARN_ON(1); | |
1096 | spin_unlock(&root->fs_info->delalloc_lock); | |
1097 | } | |
b4ce94de | 1098 | |
b9473439 CM |
1099 | /* ugh, clear_extent_buffer_dirty needs to lock the page */ |
1100 | btrfs_set_lock_blocking(buf); | |
0b32f4bb | 1101 | clear_extent_buffer_dirty(buf); |
925baedd | 1102 | } |
5f39d397 CM |
1103 | return 0; |
1104 | } | |
1105 | ||
db94535d | 1106 | static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, |
87ee04eb | 1107 | u32 stripesize, struct btrfs_root *root, |
9f5fae2f | 1108 | struct btrfs_fs_info *fs_info, |
e20d96d6 | 1109 | u64 objectid) |
d97e63b6 | 1110 | { |
cfaa7295 | 1111 | root->node = NULL; |
a28ec197 | 1112 | root->commit_root = NULL; |
db94535d CM |
1113 | root->sectorsize = sectorsize; |
1114 | root->nodesize = nodesize; | |
1115 | root->leafsize = leafsize; | |
87ee04eb | 1116 | root->stripesize = stripesize; |
123abc88 | 1117 | root->ref_cows = 0; |
0b86a832 | 1118 | root->track_dirty = 0; |
c71bf099 | 1119 | root->in_radix = 0; |
d68fc57b YZ |
1120 | root->orphan_item_inserted = 0; |
1121 | root->orphan_cleanup_state = 0; | |
0b86a832 | 1122 | |
0f7d52f4 CM |
1123 | root->objectid = objectid; |
1124 | root->last_trans = 0; | |
13a8a7c8 | 1125 | root->highest_objectid = 0; |
58176a96 | 1126 | root->name = NULL; |
6bef4d31 | 1127 | root->inode_tree = RB_ROOT; |
16cdcec7 | 1128 | INIT_RADIX_TREE(&root->delayed_nodes_tree, GFP_ATOMIC); |
f0486c68 | 1129 | root->block_rsv = NULL; |
d68fc57b | 1130 | root->orphan_block_rsv = NULL; |
0b86a832 CM |
1131 | |
1132 | INIT_LIST_HEAD(&root->dirty_list); | |
7b128766 | 1133 | INIT_LIST_HEAD(&root->orphan_list); |
5d4f98a2 | 1134 | INIT_LIST_HEAD(&root->root_list); |
d68fc57b | 1135 | spin_lock_init(&root->orphan_lock); |
5d4f98a2 | 1136 | spin_lock_init(&root->inode_lock); |
f0486c68 | 1137 | spin_lock_init(&root->accounting_lock); |
a2135011 | 1138 | mutex_init(&root->objectid_mutex); |
e02119d5 | 1139 | mutex_init(&root->log_mutex); |
7237f183 YZ |
1140 | init_waitqueue_head(&root->log_writer_wait); |
1141 | init_waitqueue_head(&root->log_commit_wait[0]); | |
1142 | init_waitqueue_head(&root->log_commit_wait[1]); | |
1143 | atomic_set(&root->log_commit[0], 0); | |
1144 | atomic_set(&root->log_commit[1], 0); | |
1145 | atomic_set(&root->log_writers, 0); | |
1146 | root->log_batch = 0; | |
1147 | root->log_transid = 0; | |
257c62e1 | 1148 | root->last_log_commit = 0; |
d0c803c4 | 1149 | extent_io_tree_init(&root->dirty_log_pages, |
f993c883 | 1150 | fs_info->btree_inode->i_mapping); |
017e5369 | 1151 | |
3768f368 CM |
1152 | memset(&root->root_key, 0, sizeof(root->root_key)); |
1153 | memset(&root->root_item, 0, sizeof(root->root_item)); | |
6702ed49 | 1154 | memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); |
58176a96 | 1155 | memset(&root->root_kobj, 0, sizeof(root->root_kobj)); |
3f157a2f | 1156 | root->defrag_trans_start = fs_info->generation; |
58176a96 | 1157 | init_completion(&root->kobj_unregister); |
6702ed49 | 1158 | root->defrag_running = 0; |
4d775673 | 1159 | root->root_key.objectid = objectid; |
0ee5dc67 | 1160 | root->anon_dev = 0; |
3768f368 CM |
1161 | return 0; |
1162 | } | |
1163 | ||
db94535d | 1164 | static int find_and_setup_root(struct btrfs_root *tree_root, |
9f5fae2f CM |
1165 | struct btrfs_fs_info *fs_info, |
1166 | u64 objectid, | |
e20d96d6 | 1167 | struct btrfs_root *root) |
3768f368 CM |
1168 | { |
1169 | int ret; | |
db94535d | 1170 | u32 blocksize; |
84234f3a | 1171 | u64 generation; |
3768f368 | 1172 | |
db94535d | 1173 | __setup_root(tree_root->nodesize, tree_root->leafsize, |
87ee04eb CM |
1174 | tree_root->sectorsize, tree_root->stripesize, |
1175 | root, fs_info, objectid); | |
3768f368 CM |
1176 | ret = btrfs_find_last_root(tree_root, objectid, |
1177 | &root->root_item, &root->root_key); | |
4df27c4d YZ |
1178 | if (ret > 0) |
1179 | return -ENOENT; | |
3768f368 CM |
1180 | BUG_ON(ret); |
1181 | ||
84234f3a | 1182 | generation = btrfs_root_generation(&root->root_item); |
db94535d | 1183 | blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); |
af31f5e5 | 1184 | root->commit_root = NULL; |
db94535d | 1185 | root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), |
84234f3a | 1186 | blocksize, generation); |
68433b73 CM |
1187 | if (!root->node || !btrfs_buffer_uptodate(root->node, generation)) { |
1188 | free_extent_buffer(root->node); | |
af31f5e5 | 1189 | root->node = NULL; |
68433b73 CM |
1190 | return -EIO; |
1191 | } | |
4df27c4d | 1192 | root->commit_root = btrfs_root_node(root); |
d97e63b6 CM |
1193 | return 0; |
1194 | } | |
1195 | ||
f84a8bd6 | 1196 | static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info) |
6f07e42e AV |
1197 | { |
1198 | struct btrfs_root *root = kzalloc(sizeof(*root), GFP_NOFS); | |
1199 | if (root) | |
1200 | root->fs_info = fs_info; | |
1201 | return root; | |
1202 | } | |
1203 | ||
7237f183 YZ |
1204 | static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans, |
1205 | struct btrfs_fs_info *fs_info) | |
0f7d52f4 CM |
1206 | { |
1207 | struct btrfs_root *root; | |
1208 | struct btrfs_root *tree_root = fs_info->tree_root; | |
7237f183 | 1209 | struct extent_buffer *leaf; |
e02119d5 | 1210 | |
6f07e42e | 1211 | root = btrfs_alloc_root(fs_info); |
e02119d5 | 1212 | if (!root) |
7237f183 | 1213 | return ERR_PTR(-ENOMEM); |
e02119d5 CM |
1214 | |
1215 | __setup_root(tree_root->nodesize, tree_root->leafsize, | |
1216 | tree_root->sectorsize, tree_root->stripesize, | |
1217 | root, fs_info, BTRFS_TREE_LOG_OBJECTID); | |
1218 | ||
1219 | root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; | |
1220 | root->root_key.type = BTRFS_ROOT_ITEM_KEY; | |
1221 | root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; | |
7237f183 YZ |
1222 | /* |
1223 | * log trees do not get reference counted because they go away | |
1224 | * before a real commit is actually done. They do store pointers | |
1225 | * to file data extents, and those reference counts still get | |
1226 | * updated (along with back refs to the log tree). | |
1227 | */ | |
e02119d5 CM |
1228 | root->ref_cows = 0; |
1229 | ||
5d4f98a2 | 1230 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, |
66d7e7f0 AJ |
1231 | BTRFS_TREE_LOG_OBJECTID, NULL, |
1232 | 0, 0, 0, 0); | |
7237f183 YZ |
1233 | if (IS_ERR(leaf)) { |
1234 | kfree(root); | |
1235 | return ERR_CAST(leaf); | |
1236 | } | |
e02119d5 | 1237 | |
5d4f98a2 YZ |
1238 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
1239 | btrfs_set_header_bytenr(leaf, leaf->start); | |
1240 | btrfs_set_header_generation(leaf, trans->transid); | |
1241 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); | |
1242 | btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID); | |
7237f183 | 1243 | root->node = leaf; |
e02119d5 CM |
1244 | |
1245 | write_extent_buffer(root->node, root->fs_info->fsid, | |
1246 | (unsigned long)btrfs_header_fsid(root->node), | |
1247 | BTRFS_FSID_SIZE); | |
1248 | btrfs_mark_buffer_dirty(root->node); | |
1249 | btrfs_tree_unlock(root->node); | |
7237f183 YZ |
1250 | return root; |
1251 | } | |
1252 | ||
1253 | int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, | |
1254 | struct btrfs_fs_info *fs_info) | |
1255 | { | |
1256 | struct btrfs_root *log_root; | |
1257 | ||
1258 | log_root = alloc_log_tree(trans, fs_info); | |
1259 | if (IS_ERR(log_root)) | |
1260 | return PTR_ERR(log_root); | |
1261 | WARN_ON(fs_info->log_root_tree); | |
1262 | fs_info->log_root_tree = log_root; | |
1263 | return 0; | |
1264 | } | |
1265 | ||
1266 | int btrfs_add_log_tree(struct btrfs_trans_handle *trans, | |
1267 | struct btrfs_root *root) | |
1268 | { | |
1269 | struct btrfs_root *log_root; | |
1270 | struct btrfs_inode_item *inode_item; | |
1271 | ||
1272 | log_root = alloc_log_tree(trans, root->fs_info); | |
1273 | if (IS_ERR(log_root)) | |
1274 | return PTR_ERR(log_root); | |
1275 | ||
1276 | log_root->last_trans = trans->transid; | |
1277 | log_root->root_key.offset = root->root_key.objectid; | |
1278 | ||
1279 | inode_item = &log_root->root_item.inode; | |
1280 | inode_item->generation = cpu_to_le64(1); | |
1281 | inode_item->size = cpu_to_le64(3); | |
1282 | inode_item->nlink = cpu_to_le32(1); | |
1283 | inode_item->nbytes = cpu_to_le64(root->leafsize); | |
1284 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
1285 | ||
5d4f98a2 | 1286 | btrfs_set_root_node(&log_root->root_item, log_root->node); |
7237f183 YZ |
1287 | |
1288 | WARN_ON(root->log_root); | |
1289 | root->log_root = log_root; | |
1290 | root->log_transid = 0; | |
257c62e1 | 1291 | root->last_log_commit = 0; |
e02119d5 CM |
1292 | return 0; |
1293 | } | |
1294 | ||
1295 | struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root, | |
1296 | struct btrfs_key *location) | |
1297 | { | |
1298 | struct btrfs_root *root; | |
1299 | struct btrfs_fs_info *fs_info = tree_root->fs_info; | |
0f7d52f4 | 1300 | struct btrfs_path *path; |
5f39d397 | 1301 | struct extent_buffer *l; |
84234f3a | 1302 | u64 generation; |
db94535d | 1303 | u32 blocksize; |
0f7d52f4 CM |
1304 | int ret = 0; |
1305 | ||
6f07e42e | 1306 | root = btrfs_alloc_root(fs_info); |
0cf6c620 | 1307 | if (!root) |
0f7d52f4 | 1308 | return ERR_PTR(-ENOMEM); |
0f7d52f4 | 1309 | if (location->offset == (u64)-1) { |
db94535d | 1310 | ret = find_and_setup_root(tree_root, fs_info, |
0f7d52f4 CM |
1311 | location->objectid, root); |
1312 | if (ret) { | |
0f7d52f4 CM |
1313 | kfree(root); |
1314 | return ERR_PTR(ret); | |
1315 | } | |
13a8a7c8 | 1316 | goto out; |
0f7d52f4 CM |
1317 | } |
1318 | ||
db94535d | 1319 | __setup_root(tree_root->nodesize, tree_root->leafsize, |
87ee04eb CM |
1320 | tree_root->sectorsize, tree_root->stripesize, |
1321 | root, fs_info, location->objectid); | |
0f7d52f4 CM |
1322 | |
1323 | path = btrfs_alloc_path(); | |
db5b493a TI |
1324 | if (!path) { |
1325 | kfree(root); | |
1326 | return ERR_PTR(-ENOMEM); | |
1327 | } | |
0f7d52f4 | 1328 | ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); |
13a8a7c8 YZ |
1329 | if (ret == 0) { |
1330 | l = path->nodes[0]; | |
1331 | read_extent_buffer(l, &root->root_item, | |
1332 | btrfs_item_ptr_offset(l, path->slots[0]), | |
1333 | sizeof(root->root_item)); | |
1334 | memcpy(&root->root_key, location, sizeof(*location)); | |
0f7d52f4 | 1335 | } |
0f7d52f4 CM |
1336 | btrfs_free_path(path); |
1337 | if (ret) { | |
5e540f77 | 1338 | kfree(root); |
13a8a7c8 YZ |
1339 | if (ret > 0) |
1340 | ret = -ENOENT; | |
0f7d52f4 CM |
1341 | return ERR_PTR(ret); |
1342 | } | |
13a8a7c8 | 1343 | |
84234f3a | 1344 | generation = btrfs_root_generation(&root->root_item); |
db94535d CM |
1345 | blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); |
1346 | root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), | |
84234f3a | 1347 | blocksize, generation); |
5d4f98a2 | 1348 | root->commit_root = btrfs_root_node(root); |
0f7d52f4 | 1349 | BUG_ON(!root->node); |
13a8a7c8 | 1350 | out: |
08fe4db1 | 1351 | if (location->objectid != BTRFS_TREE_LOG_OBJECTID) { |
e02119d5 | 1352 | root->ref_cows = 1; |
08fe4db1 LZ |
1353 | btrfs_check_and_init_root_item(&root->root_item); |
1354 | } | |
13a8a7c8 | 1355 | |
5eda7b5e CM |
1356 | return root; |
1357 | } | |
1358 | ||
edbd8d4e CM |
1359 | struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, |
1360 | struct btrfs_key *location) | |
5eda7b5e CM |
1361 | { |
1362 | struct btrfs_root *root; | |
1363 | int ret; | |
1364 | ||
edbd8d4e CM |
1365 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) |
1366 | return fs_info->tree_root; | |
1367 | if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) | |
1368 | return fs_info->extent_root; | |
8f18cf13 CM |
1369 | if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) |
1370 | return fs_info->chunk_root; | |
1371 | if (location->objectid == BTRFS_DEV_TREE_OBJECTID) | |
1372 | return fs_info->dev_root; | |
0403e47e YZ |
1373 | if (location->objectid == BTRFS_CSUM_TREE_OBJECTID) |
1374 | return fs_info->csum_root; | |
4df27c4d YZ |
1375 | again: |
1376 | spin_lock(&fs_info->fs_roots_radix_lock); | |
5eda7b5e CM |
1377 | root = radix_tree_lookup(&fs_info->fs_roots_radix, |
1378 | (unsigned long)location->objectid); | |
4df27c4d | 1379 | spin_unlock(&fs_info->fs_roots_radix_lock); |
5eda7b5e CM |
1380 | if (root) |
1381 | return root; | |
1382 | ||
e02119d5 | 1383 | root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location); |
5eda7b5e CM |
1384 | if (IS_ERR(root)) |
1385 | return root; | |
3394e160 | 1386 | |
581bb050 | 1387 | root->free_ino_ctl = kzalloc(sizeof(*root->free_ino_ctl), GFP_NOFS); |
581bb050 LZ |
1388 | root->free_ino_pinned = kzalloc(sizeof(*root->free_ino_pinned), |
1389 | GFP_NOFS); | |
35a30d7c DS |
1390 | if (!root->free_ino_pinned || !root->free_ino_ctl) { |
1391 | ret = -ENOMEM; | |
581bb050 | 1392 | goto fail; |
35a30d7c | 1393 | } |
581bb050 LZ |
1394 | |
1395 | btrfs_init_free_ino_ctl(root); | |
1396 | mutex_init(&root->fs_commit_mutex); | |
1397 | spin_lock_init(&root->cache_lock); | |
1398 | init_waitqueue_head(&root->cache_wait); | |
1399 | ||
0ee5dc67 | 1400 | ret = get_anon_bdev(&root->anon_dev); |
ac08aedf CM |
1401 | if (ret) |
1402 | goto fail; | |
3394e160 | 1403 | |
d68fc57b YZ |
1404 | if (btrfs_root_refs(&root->root_item) == 0) { |
1405 | ret = -ENOENT; | |
1406 | goto fail; | |
1407 | } | |
1408 | ||
1409 | ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid); | |
1410 | if (ret < 0) | |
1411 | goto fail; | |
1412 | if (ret == 0) | |
1413 | root->orphan_item_inserted = 1; | |
1414 | ||
4df27c4d YZ |
1415 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); |
1416 | if (ret) | |
1417 | goto fail; | |
1418 | ||
1419 | spin_lock(&fs_info->fs_roots_radix_lock); | |
2619ba1f CM |
1420 | ret = radix_tree_insert(&fs_info->fs_roots_radix, |
1421 | (unsigned long)root->root_key.objectid, | |
0f7d52f4 | 1422 | root); |
d68fc57b | 1423 | if (ret == 0) |
4df27c4d | 1424 | root->in_radix = 1; |
d68fc57b | 1425 | |
4df27c4d YZ |
1426 | spin_unlock(&fs_info->fs_roots_radix_lock); |
1427 | radix_tree_preload_end(); | |
0f7d52f4 | 1428 | if (ret) { |
4df27c4d YZ |
1429 | if (ret == -EEXIST) { |
1430 | free_fs_root(root); | |
1431 | goto again; | |
1432 | } | |
1433 | goto fail; | |
0f7d52f4 | 1434 | } |
4df27c4d YZ |
1435 | |
1436 | ret = btrfs_find_dead_roots(fs_info->tree_root, | |
1437 | root->root_key.objectid); | |
1438 | WARN_ON(ret); | |
edbd8d4e | 1439 | return root; |
4df27c4d YZ |
1440 | fail: |
1441 | free_fs_root(root); | |
1442 | return ERR_PTR(ret); | |
edbd8d4e CM |
1443 | } |
1444 | ||
04160088 CM |
1445 | static int btrfs_congested_fn(void *congested_data, int bdi_bits) |
1446 | { | |
1447 | struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; | |
1448 | int ret = 0; | |
04160088 CM |
1449 | struct btrfs_device *device; |
1450 | struct backing_dev_info *bdi; | |
b7967db7 | 1451 | |
1f78160c XG |
1452 | rcu_read_lock(); |
1453 | list_for_each_entry_rcu(device, &info->fs_devices->devices, dev_list) { | |
dfe25020 CM |
1454 | if (!device->bdev) |
1455 | continue; | |
04160088 CM |
1456 | bdi = blk_get_backing_dev_info(device->bdev); |
1457 | if (bdi && bdi_congested(bdi, bdi_bits)) { | |
1458 | ret = 1; | |
1459 | break; | |
1460 | } | |
1461 | } | |
1f78160c | 1462 | rcu_read_unlock(); |
04160088 CM |
1463 | return ret; |
1464 | } | |
1465 | ||
ad081f14 JA |
1466 | /* |
1467 | * If this fails, caller must call bdi_destroy() to get rid of the | |
1468 | * bdi again. | |
1469 | */ | |
04160088 CM |
1470 | static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) |
1471 | { | |
ad081f14 JA |
1472 | int err; |
1473 | ||
1474 | bdi->capabilities = BDI_CAP_MAP_COPY; | |
e6d086d8 | 1475 | err = bdi_setup_and_register(bdi, "btrfs", BDI_CAP_MAP_COPY); |
ad081f14 JA |
1476 | if (err) |
1477 | return err; | |
1478 | ||
4575c9cc | 1479 | bdi->ra_pages = default_backing_dev_info.ra_pages; |
04160088 CM |
1480 | bdi->congested_fn = btrfs_congested_fn; |
1481 | bdi->congested_data = info; | |
1482 | return 0; | |
1483 | } | |
1484 | ||
8b712842 CM |
1485 | /* |
1486 | * called by the kthread helper functions to finally call the bio end_io | |
1487 | * functions. This is where read checksum verification actually happens | |
1488 | */ | |
1489 | static void end_workqueue_fn(struct btrfs_work *work) | |
ce9adaa5 | 1490 | { |
ce9adaa5 | 1491 | struct bio *bio; |
8b712842 CM |
1492 | struct end_io_wq *end_io_wq; |
1493 | struct btrfs_fs_info *fs_info; | |
ce9adaa5 | 1494 | int error; |
ce9adaa5 | 1495 | |
8b712842 CM |
1496 | end_io_wq = container_of(work, struct end_io_wq, work); |
1497 | bio = end_io_wq->bio; | |
1498 | fs_info = end_io_wq->info; | |
ce9adaa5 | 1499 | |
8b712842 CM |
1500 | error = end_io_wq->error; |
1501 | bio->bi_private = end_io_wq->private; | |
1502 | bio->bi_end_io = end_io_wq->end_io; | |
1503 | kfree(end_io_wq); | |
8b712842 | 1504 | bio_endio(bio, error); |
44b8bd7e CM |
1505 | } |
1506 | ||
a74a4b97 CM |
1507 | static int cleaner_kthread(void *arg) |
1508 | { | |
1509 | struct btrfs_root *root = arg; | |
1510 | ||
1511 | do { | |
a74a4b97 | 1512 | vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); |
76dda93c YZ |
1513 | |
1514 | if (!(root->fs_info->sb->s_flags & MS_RDONLY) && | |
1515 | mutex_trylock(&root->fs_info->cleaner_mutex)) { | |
24bbcf04 | 1516 | btrfs_run_delayed_iputs(root); |
76dda93c YZ |
1517 | btrfs_clean_old_snapshots(root); |
1518 | mutex_unlock(&root->fs_info->cleaner_mutex); | |
4cb5300b | 1519 | btrfs_run_defrag_inodes(root->fs_info); |
76dda93c | 1520 | } |
a74a4b97 | 1521 | |
a0acae0e | 1522 | if (!try_to_freeze()) { |
a74a4b97 | 1523 | set_current_state(TASK_INTERRUPTIBLE); |
8929ecfa YZ |
1524 | if (!kthread_should_stop()) |
1525 | schedule(); | |
a74a4b97 CM |
1526 | __set_current_state(TASK_RUNNING); |
1527 | } | |
1528 | } while (!kthread_should_stop()); | |
1529 | return 0; | |
1530 | } | |
1531 | ||
1532 | static int transaction_kthread(void *arg) | |
1533 | { | |
1534 | struct btrfs_root *root = arg; | |
1535 | struct btrfs_trans_handle *trans; | |
1536 | struct btrfs_transaction *cur; | |
8929ecfa | 1537 | u64 transid; |
a74a4b97 CM |
1538 | unsigned long now; |
1539 | unsigned long delay; | |
1540 | int ret; | |
1541 | ||
1542 | do { | |
a74a4b97 CM |
1543 | delay = HZ * 30; |
1544 | vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); | |
1545 | mutex_lock(&root->fs_info->transaction_kthread_mutex); | |
1546 | ||
a4abeea4 | 1547 | spin_lock(&root->fs_info->trans_lock); |
a74a4b97 CM |
1548 | cur = root->fs_info->running_transaction; |
1549 | if (!cur) { | |
a4abeea4 | 1550 | spin_unlock(&root->fs_info->trans_lock); |
a74a4b97 CM |
1551 | goto sleep; |
1552 | } | |
31153d81 | 1553 | |
a74a4b97 | 1554 | now = get_seconds(); |
8929ecfa YZ |
1555 | if (!cur->blocked && |
1556 | (now < cur->start_time || now - cur->start_time < 30)) { | |
a4abeea4 | 1557 | spin_unlock(&root->fs_info->trans_lock); |
a74a4b97 CM |
1558 | delay = HZ * 5; |
1559 | goto sleep; | |
1560 | } | |
8929ecfa | 1561 | transid = cur->transid; |
a4abeea4 | 1562 | spin_unlock(&root->fs_info->trans_lock); |
56bec294 | 1563 | |
7a7eaa40 | 1564 | trans = btrfs_join_transaction(root); |
3612b495 | 1565 | BUG_ON(IS_ERR(trans)); |
8929ecfa YZ |
1566 | if (transid == trans->transid) { |
1567 | ret = btrfs_commit_transaction(trans, root); | |
1568 | BUG_ON(ret); | |
1569 | } else { | |
1570 | btrfs_end_transaction(trans, root); | |
1571 | } | |
a74a4b97 CM |
1572 | sleep: |
1573 | wake_up_process(root->fs_info->cleaner_kthread); | |
1574 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
1575 | ||
a0acae0e | 1576 | if (!try_to_freeze()) { |
a74a4b97 | 1577 | set_current_state(TASK_INTERRUPTIBLE); |
8929ecfa YZ |
1578 | if (!kthread_should_stop() && |
1579 | !btrfs_transaction_blocked(root->fs_info)) | |
1580 | schedule_timeout(delay); | |
a74a4b97 CM |
1581 | __set_current_state(TASK_RUNNING); |
1582 | } | |
1583 | } while (!kthread_should_stop()); | |
1584 | return 0; | |
1585 | } | |
1586 | ||
af31f5e5 CM |
1587 | /* |
1588 | * this will find the highest generation in the array of | |
1589 | * root backups. The index of the highest array is returned, | |
1590 | * or -1 if we can't find anything. | |
1591 | * | |
1592 | * We check to make sure the array is valid by comparing the | |
1593 | * generation of the latest root in the array with the generation | |
1594 | * in the super block. If they don't match we pitch it. | |
1595 | */ | |
1596 | static int find_newest_super_backup(struct btrfs_fs_info *info, u64 newest_gen) | |
1597 | { | |
1598 | u64 cur; | |
1599 | int newest_index = -1; | |
1600 | struct btrfs_root_backup *root_backup; | |
1601 | int i; | |
1602 | ||
1603 | for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) { | |
1604 | root_backup = info->super_copy->super_roots + i; | |
1605 | cur = btrfs_backup_tree_root_gen(root_backup); | |
1606 | if (cur == newest_gen) | |
1607 | newest_index = i; | |
1608 | } | |
1609 | ||
1610 | /* check to see if we actually wrapped around */ | |
1611 | if (newest_index == BTRFS_NUM_BACKUP_ROOTS - 1) { | |
1612 | root_backup = info->super_copy->super_roots; | |
1613 | cur = btrfs_backup_tree_root_gen(root_backup); | |
1614 | if (cur == newest_gen) | |
1615 | newest_index = 0; | |
1616 | } | |
1617 | return newest_index; | |
1618 | } | |
1619 | ||
1620 | ||
1621 | /* | |
1622 | * find the oldest backup so we know where to store new entries | |
1623 | * in the backup array. This will set the backup_root_index | |
1624 | * field in the fs_info struct | |
1625 | */ | |
1626 | static void find_oldest_super_backup(struct btrfs_fs_info *info, | |
1627 | u64 newest_gen) | |
1628 | { | |
1629 | int newest_index = -1; | |
1630 | ||
1631 | newest_index = find_newest_super_backup(info, newest_gen); | |
1632 | /* if there was garbage in there, just move along */ | |
1633 | if (newest_index == -1) { | |
1634 | info->backup_root_index = 0; | |
1635 | } else { | |
1636 | info->backup_root_index = (newest_index + 1) % BTRFS_NUM_BACKUP_ROOTS; | |
1637 | } | |
1638 | } | |
1639 | ||
1640 | /* | |
1641 | * copy all the root pointers into the super backup array. | |
1642 | * this will bump the backup pointer by one when it is | |
1643 | * done | |
1644 | */ | |
1645 | static void backup_super_roots(struct btrfs_fs_info *info) | |
1646 | { | |
1647 | int next_backup; | |
1648 | struct btrfs_root_backup *root_backup; | |
1649 | int last_backup; | |
1650 | ||
1651 | next_backup = info->backup_root_index; | |
1652 | last_backup = (next_backup + BTRFS_NUM_BACKUP_ROOTS - 1) % | |
1653 | BTRFS_NUM_BACKUP_ROOTS; | |
1654 | ||
1655 | /* | |
1656 | * just overwrite the last backup if we're at the same generation | |
1657 | * this happens only at umount | |
1658 | */ | |
1659 | root_backup = info->super_for_commit->super_roots + last_backup; | |
1660 | if (btrfs_backup_tree_root_gen(root_backup) == | |
1661 | btrfs_header_generation(info->tree_root->node)) | |
1662 | next_backup = last_backup; | |
1663 | ||
1664 | root_backup = info->super_for_commit->super_roots + next_backup; | |
1665 | ||
1666 | /* | |
1667 | * make sure all of our padding and empty slots get zero filled | |
1668 | * regardless of which ones we use today | |
1669 | */ | |
1670 | memset(root_backup, 0, sizeof(*root_backup)); | |
1671 | ||
1672 | info->backup_root_index = (next_backup + 1) % BTRFS_NUM_BACKUP_ROOTS; | |
1673 | ||
1674 | btrfs_set_backup_tree_root(root_backup, info->tree_root->node->start); | |
1675 | btrfs_set_backup_tree_root_gen(root_backup, | |
1676 | btrfs_header_generation(info->tree_root->node)); | |
1677 | ||
1678 | btrfs_set_backup_tree_root_level(root_backup, | |
1679 | btrfs_header_level(info->tree_root->node)); | |
1680 | ||
1681 | btrfs_set_backup_chunk_root(root_backup, info->chunk_root->node->start); | |
1682 | btrfs_set_backup_chunk_root_gen(root_backup, | |
1683 | btrfs_header_generation(info->chunk_root->node)); | |
1684 | btrfs_set_backup_chunk_root_level(root_backup, | |
1685 | btrfs_header_level(info->chunk_root->node)); | |
1686 | ||
1687 | btrfs_set_backup_extent_root(root_backup, info->extent_root->node->start); | |
1688 | btrfs_set_backup_extent_root_gen(root_backup, | |
1689 | btrfs_header_generation(info->extent_root->node)); | |
1690 | btrfs_set_backup_extent_root_level(root_backup, | |
1691 | btrfs_header_level(info->extent_root->node)); | |
1692 | ||
7c7e82a7 CM |
1693 | /* |
1694 | * we might commit during log recovery, which happens before we set | |
1695 | * the fs_root. Make sure it is valid before we fill it in. | |
1696 | */ | |
1697 | if (info->fs_root && info->fs_root->node) { | |
1698 | btrfs_set_backup_fs_root(root_backup, | |
1699 | info->fs_root->node->start); | |
1700 | btrfs_set_backup_fs_root_gen(root_backup, | |
af31f5e5 | 1701 | btrfs_header_generation(info->fs_root->node)); |
7c7e82a7 | 1702 | btrfs_set_backup_fs_root_level(root_backup, |
af31f5e5 | 1703 | btrfs_header_level(info->fs_root->node)); |
7c7e82a7 | 1704 | } |
af31f5e5 CM |
1705 | |
1706 | btrfs_set_backup_dev_root(root_backup, info->dev_root->node->start); | |
1707 | btrfs_set_backup_dev_root_gen(root_backup, | |
1708 | btrfs_header_generation(info->dev_root->node)); | |
1709 | btrfs_set_backup_dev_root_level(root_backup, | |
1710 | btrfs_header_level(info->dev_root->node)); | |
1711 | ||
1712 | btrfs_set_backup_csum_root(root_backup, info->csum_root->node->start); | |
1713 | btrfs_set_backup_csum_root_gen(root_backup, | |
1714 | btrfs_header_generation(info->csum_root->node)); | |
1715 | btrfs_set_backup_csum_root_level(root_backup, | |
1716 | btrfs_header_level(info->csum_root->node)); | |
1717 | ||
1718 | btrfs_set_backup_total_bytes(root_backup, | |
1719 | btrfs_super_total_bytes(info->super_copy)); | |
1720 | btrfs_set_backup_bytes_used(root_backup, | |
1721 | btrfs_super_bytes_used(info->super_copy)); | |
1722 | btrfs_set_backup_num_devices(root_backup, | |
1723 | btrfs_super_num_devices(info->super_copy)); | |
1724 | ||
1725 | /* | |
1726 | * if we don't copy this out to the super_copy, it won't get remembered | |
1727 | * for the next commit | |
1728 | */ | |
1729 | memcpy(&info->super_copy->super_roots, | |
1730 | &info->super_for_commit->super_roots, | |
1731 | sizeof(*root_backup) * BTRFS_NUM_BACKUP_ROOTS); | |
1732 | } | |
1733 | ||
1734 | /* | |
1735 | * this copies info out of the root backup array and back into | |
1736 | * the in-memory super block. It is meant to help iterate through | |
1737 | * the array, so you send it the number of backups you've already | |
1738 | * tried and the last backup index you used. | |
1739 | * | |
1740 | * this returns -1 when it has tried all the backups | |
1741 | */ | |
1742 | static noinline int next_root_backup(struct btrfs_fs_info *info, | |
1743 | struct btrfs_super_block *super, | |
1744 | int *num_backups_tried, int *backup_index) | |
1745 | { | |
1746 | struct btrfs_root_backup *root_backup; | |
1747 | int newest = *backup_index; | |
1748 | ||
1749 | if (*num_backups_tried == 0) { | |
1750 | u64 gen = btrfs_super_generation(super); | |
1751 | ||
1752 | newest = find_newest_super_backup(info, gen); | |
1753 | if (newest == -1) | |
1754 | return -1; | |
1755 | ||
1756 | *backup_index = newest; | |
1757 | *num_backups_tried = 1; | |
1758 | } else if (*num_backups_tried == BTRFS_NUM_BACKUP_ROOTS) { | |
1759 | /* we've tried all the backups, all done */ | |
1760 | return -1; | |
1761 | } else { | |
1762 | /* jump to the next oldest backup */ | |
1763 | newest = (*backup_index + BTRFS_NUM_BACKUP_ROOTS - 1) % | |
1764 | BTRFS_NUM_BACKUP_ROOTS; | |
1765 | *backup_index = newest; | |
1766 | *num_backups_tried += 1; | |
1767 | } | |
1768 | root_backup = super->super_roots + newest; | |
1769 | ||
1770 | btrfs_set_super_generation(super, | |
1771 | btrfs_backup_tree_root_gen(root_backup)); | |
1772 | btrfs_set_super_root(super, btrfs_backup_tree_root(root_backup)); | |
1773 | btrfs_set_super_root_level(super, | |
1774 | btrfs_backup_tree_root_level(root_backup)); | |
1775 | btrfs_set_super_bytes_used(super, btrfs_backup_bytes_used(root_backup)); | |
1776 | ||
1777 | /* | |
1778 | * fixme: the total bytes and num_devices need to match or we should | |
1779 | * need a fsck | |
1780 | */ | |
1781 | btrfs_set_super_total_bytes(super, btrfs_backup_total_bytes(root_backup)); | |
1782 | btrfs_set_super_num_devices(super, btrfs_backup_num_devices(root_backup)); | |
1783 | return 0; | |
1784 | } | |
1785 | ||
1786 | /* helper to cleanup tree roots */ | |
1787 | static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root) | |
1788 | { | |
1789 | free_extent_buffer(info->tree_root->node); | |
1790 | free_extent_buffer(info->tree_root->commit_root); | |
1791 | free_extent_buffer(info->dev_root->node); | |
1792 | free_extent_buffer(info->dev_root->commit_root); | |
1793 | free_extent_buffer(info->extent_root->node); | |
1794 | free_extent_buffer(info->extent_root->commit_root); | |
1795 | free_extent_buffer(info->csum_root->node); | |
1796 | free_extent_buffer(info->csum_root->commit_root); | |
1797 | ||
1798 | info->tree_root->node = NULL; | |
1799 | info->tree_root->commit_root = NULL; | |
1800 | info->dev_root->node = NULL; | |
1801 | info->dev_root->commit_root = NULL; | |
1802 | info->extent_root->node = NULL; | |
1803 | info->extent_root->commit_root = NULL; | |
1804 | info->csum_root->node = NULL; | |
1805 | info->csum_root->commit_root = NULL; | |
1806 | ||
1807 | if (chunk_root) { | |
1808 | free_extent_buffer(info->chunk_root->node); | |
1809 | free_extent_buffer(info->chunk_root->commit_root); | |
1810 | info->chunk_root->node = NULL; | |
1811 | info->chunk_root->commit_root = NULL; | |
1812 | } | |
1813 | } | |
1814 | ||
1815 | ||
ad2b2c80 AV |
1816 | int open_ctree(struct super_block *sb, |
1817 | struct btrfs_fs_devices *fs_devices, | |
1818 | char *options) | |
2e635a27 | 1819 | { |
db94535d CM |
1820 | u32 sectorsize; |
1821 | u32 nodesize; | |
1822 | u32 leafsize; | |
1823 | u32 blocksize; | |
87ee04eb | 1824 | u32 stripesize; |
84234f3a | 1825 | u64 generation; |
f2b636e8 | 1826 | u64 features; |
3de4586c | 1827 | struct btrfs_key location; |
a061fc8d | 1828 | struct buffer_head *bh; |
4d34b278 | 1829 | struct btrfs_super_block *disk_super; |
815745cf | 1830 | struct btrfs_fs_info *fs_info = btrfs_sb(sb); |
f84a8bd6 | 1831 | struct btrfs_root *tree_root; |
4d34b278 ID |
1832 | struct btrfs_root *extent_root; |
1833 | struct btrfs_root *csum_root; | |
1834 | struct btrfs_root *chunk_root; | |
1835 | struct btrfs_root *dev_root; | |
e02119d5 | 1836 | struct btrfs_root *log_tree_root; |
eb60ceac | 1837 | int ret; |
e58ca020 | 1838 | int err = -EINVAL; |
af31f5e5 CM |
1839 | int num_backups_tried = 0; |
1840 | int backup_index = 0; | |
4543df7e | 1841 | |
f84a8bd6 | 1842 | tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info); |
6f07e42e AV |
1843 | extent_root = fs_info->extent_root = btrfs_alloc_root(fs_info); |
1844 | csum_root = fs_info->csum_root = btrfs_alloc_root(fs_info); | |
1845 | chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info); | |
1846 | dev_root = fs_info->dev_root = btrfs_alloc_root(fs_info); | |
8790d502 | 1847 | |
f84a8bd6 AV |
1848 | if (!tree_root || !extent_root || !csum_root || |
1849 | !chunk_root || !dev_root) { | |
39279cc3 CM |
1850 | err = -ENOMEM; |
1851 | goto fail; | |
1852 | } | |
76dda93c YZ |
1853 | |
1854 | ret = init_srcu_struct(&fs_info->subvol_srcu); | |
1855 | if (ret) { | |
1856 | err = ret; | |
1857 | goto fail; | |
1858 | } | |
1859 | ||
1860 | ret = setup_bdi(fs_info, &fs_info->bdi); | |
1861 | if (ret) { | |
1862 | err = ret; | |
1863 | goto fail_srcu; | |
1864 | } | |
1865 | ||
1866 | fs_info->btree_inode = new_inode(sb); | |
1867 | if (!fs_info->btree_inode) { | |
1868 | err = -ENOMEM; | |
1869 | goto fail_bdi; | |
1870 | } | |
1871 | ||
a6591715 | 1872 | mapping_set_gfp_mask(fs_info->btree_inode->i_mapping, GFP_NOFS); |
1561deda | 1873 | |
76dda93c | 1874 | INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); |
8fd17795 | 1875 | INIT_LIST_HEAD(&fs_info->trans_list); |
facda1e7 | 1876 | INIT_LIST_HEAD(&fs_info->dead_roots); |
24bbcf04 | 1877 | INIT_LIST_HEAD(&fs_info->delayed_iputs); |
19c00ddc | 1878 | INIT_LIST_HEAD(&fs_info->hashers); |
ea8c2819 | 1879 | INIT_LIST_HEAD(&fs_info->delalloc_inodes); |
5a3f23d5 | 1880 | INIT_LIST_HEAD(&fs_info->ordered_operations); |
11833d66 | 1881 | INIT_LIST_HEAD(&fs_info->caching_block_groups); |
1832a6d5 | 1882 | spin_lock_init(&fs_info->delalloc_lock); |
a4abeea4 | 1883 | spin_lock_init(&fs_info->trans_lock); |
31153d81 | 1884 | spin_lock_init(&fs_info->ref_cache_lock); |
76dda93c | 1885 | spin_lock_init(&fs_info->fs_roots_radix_lock); |
24bbcf04 | 1886 | spin_lock_init(&fs_info->delayed_iput_lock); |
4cb5300b | 1887 | spin_lock_init(&fs_info->defrag_inodes_lock); |
2bf64758 | 1888 | spin_lock_init(&fs_info->free_chunk_lock); |
7585717f | 1889 | mutex_init(&fs_info->reloc_mutex); |
19c00ddc | 1890 | |
58176a96 | 1891 | init_completion(&fs_info->kobj_unregister); |
0b86a832 | 1892 | INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); |
6324fbf3 | 1893 | INIT_LIST_HEAD(&fs_info->space_info); |
0b86a832 | 1894 | btrfs_mapping_init(&fs_info->mapping_tree); |
f0486c68 YZ |
1895 | btrfs_init_block_rsv(&fs_info->global_block_rsv); |
1896 | btrfs_init_block_rsv(&fs_info->delalloc_block_rsv); | |
1897 | btrfs_init_block_rsv(&fs_info->trans_block_rsv); | |
1898 | btrfs_init_block_rsv(&fs_info->chunk_block_rsv); | |
1899 | btrfs_init_block_rsv(&fs_info->empty_block_rsv); | |
6d668dda | 1900 | btrfs_init_block_rsv(&fs_info->delayed_block_rsv); |
cb03c743 | 1901 | atomic_set(&fs_info->nr_async_submits, 0); |
771ed689 | 1902 | atomic_set(&fs_info->async_delalloc_pages, 0); |
8c8bee1d | 1903 | atomic_set(&fs_info->async_submit_draining, 0); |
0986fe9e | 1904 | atomic_set(&fs_info->nr_async_bios, 0); |
4cb5300b | 1905 | atomic_set(&fs_info->defrag_running, 0); |
e20d96d6 | 1906 | fs_info->sb = sb; |
6f568d35 | 1907 | fs_info->max_inline = 8192 * 1024; |
9ed74f2d | 1908 | fs_info->metadata_ratio = 0; |
4cb5300b | 1909 | fs_info->defrag_inodes = RB_ROOT; |
a4abeea4 | 1910 | fs_info->trans_no_join = 0; |
2bf64758 | 1911 | fs_info->free_chunk_space = 0; |
c8b97818 | 1912 | |
90519d66 AJ |
1913 | /* readahead state */ |
1914 | INIT_RADIX_TREE(&fs_info->reada_tree, GFP_NOFS & ~__GFP_WAIT); | |
1915 | spin_lock_init(&fs_info->reada_lock); | |
c8b97818 | 1916 | |
b34b086c CM |
1917 | fs_info->thread_pool_size = min_t(unsigned long, |
1918 | num_online_cpus() + 2, 8); | |
0afbaf8c | 1919 | |
3eaa2885 CM |
1920 | INIT_LIST_HEAD(&fs_info->ordered_extents); |
1921 | spin_lock_init(&fs_info->ordered_extent_lock); | |
16cdcec7 MX |
1922 | fs_info->delayed_root = kmalloc(sizeof(struct btrfs_delayed_root), |
1923 | GFP_NOFS); | |
1924 | if (!fs_info->delayed_root) { | |
1925 | err = -ENOMEM; | |
1926 | goto fail_iput; | |
1927 | } | |
1928 | btrfs_init_delayed_root(fs_info->delayed_root); | |
3eaa2885 | 1929 | |
a2de733c AJ |
1930 | mutex_init(&fs_info->scrub_lock); |
1931 | atomic_set(&fs_info->scrubs_running, 0); | |
1932 | atomic_set(&fs_info->scrub_pause_req, 0); | |
1933 | atomic_set(&fs_info->scrubs_paused, 0); | |
1934 | atomic_set(&fs_info->scrub_cancel_req, 0); | |
1935 | init_waitqueue_head(&fs_info->scrub_pause_wait); | |
1936 | init_rwsem(&fs_info->scrub_super_lock); | |
1937 | fs_info->scrub_workers_refcnt = 0; | |
21adbd5c SB |
1938 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
1939 | fs_info->check_integrity_print_mask = 0; | |
1940 | #endif | |
a2de733c | 1941 | |
c9e9f97b ID |
1942 | spin_lock_init(&fs_info->balance_lock); |
1943 | mutex_init(&fs_info->balance_mutex); | |
837d5b6e ID |
1944 | atomic_set(&fs_info->balance_running, 0); |
1945 | atomic_set(&fs_info->balance_pause_req, 0); | |
a7e99c69 | 1946 | atomic_set(&fs_info->balance_cancel_req, 0); |
c9e9f97b | 1947 | fs_info->balance_ctl = NULL; |
837d5b6e | 1948 | init_waitqueue_head(&fs_info->balance_wait_q); |
a2de733c | 1949 | |
a061fc8d CM |
1950 | sb->s_blocksize = 4096; |
1951 | sb->s_blocksize_bits = blksize_bits(4096); | |
32a88aa1 | 1952 | sb->s_bdi = &fs_info->bdi; |
a061fc8d | 1953 | |
76dda93c | 1954 | fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID; |
bfe86848 | 1955 | set_nlink(fs_info->btree_inode, 1); |
0afbaf8c CM |
1956 | /* |
1957 | * we set the i_size on the btree inode to the max possible int. | |
1958 | * the real end of the address space is determined by all of | |
1959 | * the devices in the system | |
1960 | */ | |
1961 | fs_info->btree_inode->i_size = OFFSET_MAX; | |
d98237b3 | 1962 | fs_info->btree_inode->i_mapping->a_ops = &btree_aops; |
04160088 CM |
1963 | fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; |
1964 | ||
5d4f98a2 | 1965 | RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node); |
d1310b2e | 1966 | extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, |
f993c883 | 1967 | fs_info->btree_inode->i_mapping); |
0b32f4bb | 1968 | BTRFS_I(fs_info->btree_inode)->io_tree.track_uptodate = 0; |
a8067e02 | 1969 | extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree); |
d1310b2e CM |
1970 | |
1971 | BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; | |
0da5468f | 1972 | |
76dda93c YZ |
1973 | BTRFS_I(fs_info->btree_inode)->root = tree_root; |
1974 | memset(&BTRFS_I(fs_info->btree_inode)->location, 0, | |
1975 | sizeof(struct btrfs_key)); | |
1976 | BTRFS_I(fs_info->btree_inode)->dummy_inode = 1; | |
c65ddb52 | 1977 | insert_inode_hash(fs_info->btree_inode); |
76dda93c | 1978 | |
0f9dd46c | 1979 | spin_lock_init(&fs_info->block_group_cache_lock); |
6bef4d31 | 1980 | fs_info->block_group_cache_tree = RB_ROOT; |
0f9dd46c | 1981 | |
11833d66 | 1982 | extent_io_tree_init(&fs_info->freed_extents[0], |
f993c883 | 1983 | fs_info->btree_inode->i_mapping); |
11833d66 | 1984 | extent_io_tree_init(&fs_info->freed_extents[1], |
f993c883 | 1985 | fs_info->btree_inode->i_mapping); |
11833d66 | 1986 | fs_info->pinned_extents = &fs_info->freed_extents[0]; |
e66f709b | 1987 | fs_info->do_barriers = 1; |
e18e4809 | 1988 | |
39279cc3 | 1989 | |
5a3f23d5 | 1990 | mutex_init(&fs_info->ordered_operations_mutex); |
e02119d5 | 1991 | mutex_init(&fs_info->tree_log_mutex); |
925baedd | 1992 | mutex_init(&fs_info->chunk_mutex); |
a74a4b97 CM |
1993 | mutex_init(&fs_info->transaction_kthread_mutex); |
1994 | mutex_init(&fs_info->cleaner_mutex); | |
7d9eb12c | 1995 | mutex_init(&fs_info->volume_mutex); |
276e680d | 1996 | init_rwsem(&fs_info->extent_commit_sem); |
c71bf099 | 1997 | init_rwsem(&fs_info->cleanup_work_sem); |
76dda93c | 1998 | init_rwsem(&fs_info->subvol_sem); |
fa9c0d79 CM |
1999 | |
2000 | btrfs_init_free_cluster(&fs_info->meta_alloc_cluster); | |
2001 | btrfs_init_free_cluster(&fs_info->data_alloc_cluster); | |
2002 | ||
e6dcd2dc | 2003 | init_waitqueue_head(&fs_info->transaction_throttle); |
f9295749 | 2004 | init_waitqueue_head(&fs_info->transaction_wait); |
bb9c12c9 | 2005 | init_waitqueue_head(&fs_info->transaction_blocked_wait); |
4854ddd0 | 2006 | init_waitqueue_head(&fs_info->async_submit_wait); |
3768f368 | 2007 | |
0b86a832 | 2008 | __setup_root(4096, 4096, 4096, 4096, tree_root, |
2c90e5d6 | 2009 | fs_info, BTRFS_ROOT_TREE_OBJECTID); |
7eccb903 | 2010 | |
a512bbf8 | 2011 | bh = btrfs_read_dev_super(fs_devices->latest_bdev); |
20b45077 DY |
2012 | if (!bh) { |
2013 | err = -EINVAL; | |
16cdcec7 | 2014 | goto fail_alloc; |
20b45077 | 2015 | } |
39279cc3 | 2016 | |
6c41761f DS |
2017 | memcpy(fs_info->super_copy, bh->b_data, sizeof(*fs_info->super_copy)); |
2018 | memcpy(fs_info->super_for_commit, fs_info->super_copy, | |
2019 | sizeof(*fs_info->super_for_commit)); | |
a061fc8d | 2020 | brelse(bh); |
5f39d397 | 2021 | |
6c41761f | 2022 | memcpy(fs_info->fsid, fs_info->super_copy->fsid, BTRFS_FSID_SIZE); |
0b86a832 | 2023 | |
6c41761f | 2024 | disk_super = fs_info->super_copy; |
0f7d52f4 | 2025 | if (!btrfs_super_root(disk_super)) |
16cdcec7 | 2026 | goto fail_alloc; |
0f7d52f4 | 2027 | |
acce952b | 2028 | /* check FS state, whether FS is broken. */ |
2029 | fs_info->fs_state |= btrfs_super_flags(disk_super); | |
2030 | ||
2031 | btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY); | |
2032 | ||
af31f5e5 CM |
2033 | /* |
2034 | * run through our array of backup supers and setup | |
2035 | * our ring pointer to the oldest one | |
2036 | */ | |
2037 | generation = btrfs_super_generation(disk_super); | |
2038 | find_oldest_super_backup(fs_info, generation); | |
2039 | ||
75e7cb7f LB |
2040 | /* |
2041 | * In the long term, we'll store the compression type in the super | |
2042 | * block, and it'll be used for per file compression control. | |
2043 | */ | |
2044 | fs_info->compress_type = BTRFS_COMPRESS_ZLIB; | |
2045 | ||
2b82032c YZ |
2046 | ret = btrfs_parse_options(tree_root, options); |
2047 | if (ret) { | |
2048 | err = ret; | |
16cdcec7 | 2049 | goto fail_alloc; |
2b82032c | 2050 | } |
dfe25020 | 2051 | |
f2b636e8 JB |
2052 | features = btrfs_super_incompat_flags(disk_super) & |
2053 | ~BTRFS_FEATURE_INCOMPAT_SUPP; | |
2054 | if (features) { | |
2055 | printk(KERN_ERR "BTRFS: couldn't mount because of " | |
2056 | "unsupported optional features (%Lx).\n", | |
21380931 | 2057 | (unsigned long long)features); |
f2b636e8 | 2058 | err = -EINVAL; |
16cdcec7 | 2059 | goto fail_alloc; |
f2b636e8 JB |
2060 | } |
2061 | ||
727011e0 CM |
2062 | if (btrfs_super_leafsize(disk_super) != |
2063 | btrfs_super_nodesize(disk_super)) { | |
2064 | printk(KERN_ERR "BTRFS: couldn't mount because metadata " | |
2065 | "blocksizes don't match. node %d leaf %d\n", | |
2066 | btrfs_super_nodesize(disk_super), | |
2067 | btrfs_super_leafsize(disk_super)); | |
2068 | err = -EINVAL; | |
2069 | goto fail_alloc; | |
2070 | } | |
2071 | if (btrfs_super_leafsize(disk_super) > BTRFS_MAX_METADATA_BLOCKSIZE) { | |
2072 | printk(KERN_ERR "BTRFS: couldn't mount because metadata " | |
2073 | "blocksize (%d) was too large\n", | |
2074 | btrfs_super_leafsize(disk_super)); | |
2075 | err = -EINVAL; | |
2076 | goto fail_alloc; | |
2077 | } | |
2078 | ||
5d4f98a2 | 2079 | features = btrfs_super_incompat_flags(disk_super); |
a6fa6fae LZ |
2080 | features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; |
2081 | if (tree_root->fs_info->compress_type & BTRFS_COMPRESS_LZO) | |
2082 | features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; | |
727011e0 CM |
2083 | |
2084 | /* | |
2085 | * flag our filesystem as having big metadata blocks if | |
2086 | * they are bigger than the page size | |
2087 | */ | |
2088 | if (btrfs_super_leafsize(disk_super) > PAGE_CACHE_SIZE) { | |
2089 | if (!(features & BTRFS_FEATURE_INCOMPAT_BIG_METADATA)) | |
2090 | printk(KERN_INFO "btrfs flagging fs with big metadata feature\n"); | |
2091 | features |= BTRFS_FEATURE_INCOMPAT_BIG_METADATA; | |
2092 | } | |
2093 | ||
a6fa6fae | 2094 | btrfs_set_super_incompat_flags(disk_super, features); |
5d4f98a2 | 2095 | |
f2b636e8 JB |
2096 | features = btrfs_super_compat_ro_flags(disk_super) & |
2097 | ~BTRFS_FEATURE_COMPAT_RO_SUPP; | |
2098 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
2099 | printk(KERN_ERR "BTRFS: couldn't mount RDWR because of " | |
2100 | "unsupported option features (%Lx).\n", | |
21380931 | 2101 | (unsigned long long)features); |
f2b636e8 | 2102 | err = -EINVAL; |
16cdcec7 | 2103 | goto fail_alloc; |
f2b636e8 | 2104 | } |
61d92c32 CM |
2105 | |
2106 | btrfs_init_workers(&fs_info->generic_worker, | |
2107 | "genwork", 1, NULL); | |
2108 | ||
5443be45 | 2109 | btrfs_init_workers(&fs_info->workers, "worker", |
61d92c32 CM |
2110 | fs_info->thread_pool_size, |
2111 | &fs_info->generic_worker); | |
c8b97818 | 2112 | |
771ed689 | 2113 | btrfs_init_workers(&fs_info->delalloc_workers, "delalloc", |
61d92c32 CM |
2114 | fs_info->thread_pool_size, |
2115 | &fs_info->generic_worker); | |
771ed689 | 2116 | |
5443be45 | 2117 | btrfs_init_workers(&fs_info->submit_workers, "submit", |
b720d209 | 2118 | min_t(u64, fs_devices->num_devices, |
61d92c32 CM |
2119 | fs_info->thread_pool_size), |
2120 | &fs_info->generic_worker); | |
61b49440 | 2121 | |
bab39bf9 JB |
2122 | btrfs_init_workers(&fs_info->caching_workers, "cache", |
2123 | 2, &fs_info->generic_worker); | |
2124 | ||
61b49440 CM |
2125 | /* a higher idle thresh on the submit workers makes it much more |
2126 | * likely that bios will be send down in a sane order to the | |
2127 | * devices | |
2128 | */ | |
2129 | fs_info->submit_workers.idle_thresh = 64; | |
53863232 | 2130 | |
771ed689 | 2131 | fs_info->workers.idle_thresh = 16; |
4a69a410 | 2132 | fs_info->workers.ordered = 1; |
61b49440 | 2133 | |
771ed689 CM |
2134 | fs_info->delalloc_workers.idle_thresh = 2; |
2135 | fs_info->delalloc_workers.ordered = 1; | |
2136 | ||
61d92c32 CM |
2137 | btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1, |
2138 | &fs_info->generic_worker); | |
5443be45 | 2139 | btrfs_init_workers(&fs_info->endio_workers, "endio", |
61d92c32 CM |
2140 | fs_info->thread_pool_size, |
2141 | &fs_info->generic_worker); | |
d20f7043 | 2142 | btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta", |
61d92c32 CM |
2143 | fs_info->thread_pool_size, |
2144 | &fs_info->generic_worker); | |
cad321ad | 2145 | btrfs_init_workers(&fs_info->endio_meta_write_workers, |
61d92c32 CM |
2146 | "endio-meta-write", fs_info->thread_pool_size, |
2147 | &fs_info->generic_worker); | |
5443be45 | 2148 | btrfs_init_workers(&fs_info->endio_write_workers, "endio-write", |
61d92c32 CM |
2149 | fs_info->thread_pool_size, |
2150 | &fs_info->generic_worker); | |
0cb59c99 JB |
2151 | btrfs_init_workers(&fs_info->endio_freespace_worker, "freespace-write", |
2152 | 1, &fs_info->generic_worker); | |
16cdcec7 MX |
2153 | btrfs_init_workers(&fs_info->delayed_workers, "delayed-meta", |
2154 | fs_info->thread_pool_size, | |
2155 | &fs_info->generic_worker); | |
90519d66 AJ |
2156 | btrfs_init_workers(&fs_info->readahead_workers, "readahead", |
2157 | fs_info->thread_pool_size, | |
2158 | &fs_info->generic_worker); | |
61b49440 CM |
2159 | |
2160 | /* | |
2161 | * endios are largely parallel and should have a very | |
2162 | * low idle thresh | |
2163 | */ | |
2164 | fs_info->endio_workers.idle_thresh = 4; | |
b51912c9 CM |
2165 | fs_info->endio_meta_workers.idle_thresh = 4; |
2166 | ||
9042846b CM |
2167 | fs_info->endio_write_workers.idle_thresh = 2; |
2168 | fs_info->endio_meta_write_workers.idle_thresh = 2; | |
90519d66 | 2169 | fs_info->readahead_workers.idle_thresh = 2; |
9042846b | 2170 | |
0dc3b84a JB |
2171 | /* |
2172 | * btrfs_start_workers can really only fail because of ENOMEM so just | |
2173 | * return -ENOMEM if any of these fail. | |
2174 | */ | |
2175 | ret = btrfs_start_workers(&fs_info->workers); | |
2176 | ret |= btrfs_start_workers(&fs_info->generic_worker); | |
2177 | ret |= btrfs_start_workers(&fs_info->submit_workers); | |
2178 | ret |= btrfs_start_workers(&fs_info->delalloc_workers); | |
2179 | ret |= btrfs_start_workers(&fs_info->fixup_workers); | |
2180 | ret |= btrfs_start_workers(&fs_info->endio_workers); | |
2181 | ret |= btrfs_start_workers(&fs_info->endio_meta_workers); | |
2182 | ret |= btrfs_start_workers(&fs_info->endio_meta_write_workers); | |
2183 | ret |= btrfs_start_workers(&fs_info->endio_write_workers); | |
2184 | ret |= btrfs_start_workers(&fs_info->endio_freespace_worker); | |
2185 | ret |= btrfs_start_workers(&fs_info->delayed_workers); | |
2186 | ret |= btrfs_start_workers(&fs_info->caching_workers); | |
2187 | ret |= btrfs_start_workers(&fs_info->readahead_workers); | |
2188 | if (ret) { | |
2189 | ret = -ENOMEM; | |
2190 | goto fail_sb_buffer; | |
2191 | } | |
4543df7e | 2192 | |
4575c9cc | 2193 | fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); |
c8b97818 CM |
2194 | fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, |
2195 | 4 * 1024 * 1024 / PAGE_CACHE_SIZE); | |
4575c9cc | 2196 | |
db94535d CM |
2197 | nodesize = btrfs_super_nodesize(disk_super); |
2198 | leafsize = btrfs_super_leafsize(disk_super); | |
2199 | sectorsize = btrfs_super_sectorsize(disk_super); | |
87ee04eb | 2200 | stripesize = btrfs_super_stripesize(disk_super); |
db94535d CM |
2201 | tree_root->nodesize = nodesize; |
2202 | tree_root->leafsize = leafsize; | |
2203 | tree_root->sectorsize = sectorsize; | |
87ee04eb | 2204 | tree_root->stripesize = stripesize; |
a061fc8d CM |
2205 | |
2206 | sb->s_blocksize = sectorsize; | |
2207 | sb->s_blocksize_bits = blksize_bits(sectorsize); | |
db94535d | 2208 | |
39279cc3 CM |
2209 | if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, |
2210 | sizeof(disk_super->magic))) { | |
d397712b | 2211 | printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id); |
39279cc3 CM |
2212 | goto fail_sb_buffer; |
2213 | } | |
19c00ddc | 2214 | |
941b2ddf KM |
2215 | if (sectorsize < PAGE_SIZE) { |
2216 | printk(KERN_WARNING "btrfs: Incompatible sector size " | |
2217 | "found on %s\n", sb->s_id); | |
2218 | goto fail_sb_buffer; | |
2219 | } | |
2220 | ||
925baedd | 2221 | mutex_lock(&fs_info->chunk_mutex); |
e4404d6e | 2222 | ret = btrfs_read_sys_array(tree_root); |
925baedd | 2223 | mutex_unlock(&fs_info->chunk_mutex); |
84eed90f | 2224 | if (ret) { |
d397712b CM |
2225 | printk(KERN_WARNING "btrfs: failed to read the system " |
2226 | "array on %s\n", sb->s_id); | |
5d4f98a2 | 2227 | goto fail_sb_buffer; |
84eed90f | 2228 | } |
0b86a832 CM |
2229 | |
2230 | blocksize = btrfs_level_size(tree_root, | |
2231 | btrfs_super_chunk_root_level(disk_super)); | |
84234f3a | 2232 | generation = btrfs_super_chunk_root_generation(disk_super); |
0b86a832 CM |
2233 | |
2234 | __setup_root(nodesize, leafsize, sectorsize, stripesize, | |
2235 | chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); | |
2236 | ||
2237 | chunk_root->node = read_tree_block(chunk_root, | |
2238 | btrfs_super_chunk_root(disk_super), | |
84234f3a | 2239 | blocksize, generation); |
0b86a832 | 2240 | BUG_ON(!chunk_root->node); |
83121942 DW |
2241 | if (!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) { |
2242 | printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n", | |
2243 | sb->s_id); | |
af31f5e5 | 2244 | goto fail_tree_roots; |
83121942 | 2245 | } |
5d4f98a2 YZ |
2246 | btrfs_set_root_node(&chunk_root->root_item, chunk_root->node); |
2247 | chunk_root->commit_root = btrfs_root_node(chunk_root); | |
0b86a832 | 2248 | |
e17cade2 | 2249 | read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, |
d397712b CM |
2250 | (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node), |
2251 | BTRFS_UUID_SIZE); | |
e17cade2 | 2252 | |
0b86a832 | 2253 | ret = btrfs_read_chunk_tree(chunk_root); |
2b82032c | 2254 | if (ret) { |
d397712b CM |
2255 | printk(KERN_WARNING "btrfs: failed to read chunk tree on %s\n", |
2256 | sb->s_id); | |
af31f5e5 | 2257 | goto fail_tree_roots; |
2b82032c | 2258 | } |
0b86a832 | 2259 | |
dfe25020 CM |
2260 | btrfs_close_extra_devices(fs_devices); |
2261 | ||
a6b0d5c8 CM |
2262 | if (!fs_devices->latest_bdev) { |
2263 | printk(KERN_CRIT "btrfs: failed to read devices on %s\n", | |
2264 | sb->s_id); | |
2265 | goto fail_tree_roots; | |
2266 | } | |
2267 | ||
af31f5e5 | 2268 | retry_root_backup: |
db94535d CM |
2269 | blocksize = btrfs_level_size(tree_root, |
2270 | btrfs_super_root_level(disk_super)); | |
84234f3a | 2271 | generation = btrfs_super_generation(disk_super); |
0b86a832 | 2272 | |
e20d96d6 | 2273 | tree_root->node = read_tree_block(tree_root, |
db94535d | 2274 | btrfs_super_root(disk_super), |
84234f3a | 2275 | blocksize, generation); |
af31f5e5 CM |
2276 | if (!tree_root->node || |
2277 | !test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) { | |
83121942 DW |
2278 | printk(KERN_WARNING "btrfs: failed to read tree root on %s\n", |
2279 | sb->s_id); | |
af31f5e5 CM |
2280 | |
2281 | goto recovery_tree_root; | |
83121942 | 2282 | } |
af31f5e5 | 2283 | |
5d4f98a2 YZ |
2284 | btrfs_set_root_node(&tree_root->root_item, tree_root->node); |
2285 | tree_root->commit_root = btrfs_root_node(tree_root); | |
db94535d CM |
2286 | |
2287 | ret = find_and_setup_root(tree_root, fs_info, | |
e20d96d6 | 2288 | BTRFS_EXTENT_TREE_OBJECTID, extent_root); |
0b86a832 | 2289 | if (ret) |
af31f5e5 | 2290 | goto recovery_tree_root; |
0b86a832 CM |
2291 | extent_root->track_dirty = 1; |
2292 | ||
2293 | ret = find_and_setup_root(tree_root, fs_info, | |
2294 | BTRFS_DEV_TREE_OBJECTID, dev_root); | |
0b86a832 | 2295 | if (ret) |
af31f5e5 | 2296 | goto recovery_tree_root; |
5d4f98a2 | 2297 | dev_root->track_dirty = 1; |
3768f368 | 2298 | |
d20f7043 CM |
2299 | ret = find_and_setup_root(tree_root, fs_info, |
2300 | BTRFS_CSUM_TREE_OBJECTID, csum_root); | |
2301 | if (ret) | |
af31f5e5 | 2302 | goto recovery_tree_root; |
d20f7043 CM |
2303 | |
2304 | csum_root->track_dirty = 1; | |
2305 | ||
8929ecfa YZ |
2306 | fs_info->generation = generation; |
2307 | fs_info->last_trans_committed = generation; | |
8929ecfa | 2308 | |
c59021f8 | 2309 | ret = btrfs_init_space_info(fs_info); |
2310 | if (ret) { | |
2311 | printk(KERN_ERR "Failed to initial space info: %d\n", ret); | |
2312 | goto fail_block_groups; | |
2313 | } | |
2314 | ||
1b1d1f66 JB |
2315 | ret = btrfs_read_block_groups(extent_root); |
2316 | if (ret) { | |
2317 | printk(KERN_ERR "Failed to read block groups: %d\n", ret); | |
2318 | goto fail_block_groups; | |
2319 | } | |
9078a3e1 | 2320 | |
a74a4b97 CM |
2321 | fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, |
2322 | "btrfs-cleaner"); | |
57506d50 | 2323 | if (IS_ERR(fs_info->cleaner_kthread)) |
1b1d1f66 | 2324 | goto fail_block_groups; |
a74a4b97 CM |
2325 | |
2326 | fs_info->transaction_kthread = kthread_run(transaction_kthread, | |
2327 | tree_root, | |
2328 | "btrfs-transaction"); | |
57506d50 | 2329 | if (IS_ERR(fs_info->transaction_kthread)) |
3f157a2f | 2330 | goto fail_cleaner; |
a74a4b97 | 2331 | |
c289811c CM |
2332 | if (!btrfs_test_opt(tree_root, SSD) && |
2333 | !btrfs_test_opt(tree_root, NOSSD) && | |
2334 | !fs_info->fs_devices->rotating) { | |
2335 | printk(KERN_INFO "Btrfs detected SSD devices, enabling SSD " | |
2336 | "mode\n"); | |
2337 | btrfs_set_opt(fs_info->mount_opt, SSD); | |
2338 | } | |
2339 | ||
21adbd5c SB |
2340 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
2341 | if (btrfs_test_opt(tree_root, CHECK_INTEGRITY)) { | |
2342 | ret = btrfsic_mount(tree_root, fs_devices, | |
2343 | btrfs_test_opt(tree_root, | |
2344 | CHECK_INTEGRITY_INCLUDING_EXTENT_DATA) ? | |
2345 | 1 : 0, | |
2346 | fs_info->check_integrity_print_mask); | |
2347 | if (ret) | |
2348 | printk(KERN_WARNING "btrfs: failed to initialize" | |
2349 | " integrity check module %s\n", sb->s_id); | |
2350 | } | |
2351 | #endif | |
2352 | ||
acce952b | 2353 | /* do not make disk changes in broken FS */ |
2354 | if (btrfs_super_log_root(disk_super) != 0 && | |
2355 | !(fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR)) { | |
e02119d5 CM |
2356 | u64 bytenr = btrfs_super_log_root(disk_super); |
2357 | ||
7c2ca468 | 2358 | if (fs_devices->rw_devices == 0) { |
d397712b CM |
2359 | printk(KERN_WARNING "Btrfs log replay required " |
2360 | "on RO media\n"); | |
7c2ca468 CM |
2361 | err = -EIO; |
2362 | goto fail_trans_kthread; | |
2363 | } | |
e02119d5 CM |
2364 | blocksize = |
2365 | btrfs_level_size(tree_root, | |
2366 | btrfs_super_log_root_level(disk_super)); | |
d18a2c44 | 2367 | |
6f07e42e | 2368 | log_tree_root = btrfs_alloc_root(fs_info); |
676e4c86 DC |
2369 | if (!log_tree_root) { |
2370 | err = -ENOMEM; | |
2371 | goto fail_trans_kthread; | |
2372 | } | |
e02119d5 CM |
2373 | |
2374 | __setup_root(nodesize, leafsize, sectorsize, stripesize, | |
2375 | log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID); | |
2376 | ||
2377 | log_tree_root->node = read_tree_block(tree_root, bytenr, | |
84234f3a YZ |
2378 | blocksize, |
2379 | generation + 1); | |
e02119d5 CM |
2380 | ret = btrfs_recover_log_trees(log_tree_root); |
2381 | BUG_ON(ret); | |
e556ce2c YZ |
2382 | |
2383 | if (sb->s_flags & MS_RDONLY) { | |
2384 | ret = btrfs_commit_super(tree_root); | |
2385 | BUG_ON(ret); | |
2386 | } | |
e02119d5 | 2387 | } |
1a40e23b | 2388 | |
76dda93c YZ |
2389 | ret = btrfs_find_orphan_roots(tree_root); |
2390 | BUG_ON(ret); | |
2391 | ||
7c2ca468 | 2392 | if (!(sb->s_flags & MS_RDONLY)) { |
d68fc57b YZ |
2393 | ret = btrfs_cleanup_fs_roots(fs_info); |
2394 | BUG_ON(ret); | |
2395 | ||
5d4f98a2 | 2396 | ret = btrfs_recover_relocation(tree_root); |
d7ce5843 MX |
2397 | if (ret < 0) { |
2398 | printk(KERN_WARNING | |
2399 | "btrfs: failed to recover relocation\n"); | |
2400 | err = -EINVAL; | |
2401 | goto fail_trans_kthread; | |
2402 | } | |
7c2ca468 | 2403 | } |
1a40e23b | 2404 | |
3de4586c CM |
2405 | location.objectid = BTRFS_FS_TREE_OBJECTID; |
2406 | location.type = BTRFS_ROOT_ITEM_KEY; | |
2407 | location.offset = (u64)-1; | |
2408 | ||
3de4586c CM |
2409 | fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); |
2410 | if (!fs_info->fs_root) | |
7c2ca468 | 2411 | goto fail_trans_kthread; |
3140c9a3 DC |
2412 | if (IS_ERR(fs_info->fs_root)) { |
2413 | err = PTR_ERR(fs_info->fs_root); | |
2414 | goto fail_trans_kthread; | |
2415 | } | |
c289811c | 2416 | |
e3acc2a6 JB |
2417 | if (!(sb->s_flags & MS_RDONLY)) { |
2418 | down_read(&fs_info->cleanup_work_sem); | |
66b4ffd1 JB |
2419 | err = btrfs_orphan_cleanup(fs_info->fs_root); |
2420 | if (!err) | |
2421 | err = btrfs_orphan_cleanup(fs_info->tree_root); | |
e3acc2a6 | 2422 | up_read(&fs_info->cleanup_work_sem); |
59641015 ID |
2423 | |
2424 | if (!err) | |
2425 | err = btrfs_recover_balance(fs_info->tree_root); | |
2426 | ||
66b4ffd1 JB |
2427 | if (err) { |
2428 | close_ctree(tree_root); | |
ad2b2c80 | 2429 | return err; |
66b4ffd1 | 2430 | } |
e3acc2a6 JB |
2431 | } |
2432 | ||
ad2b2c80 | 2433 | return 0; |
39279cc3 | 2434 | |
7c2ca468 CM |
2435 | fail_trans_kthread: |
2436 | kthread_stop(fs_info->transaction_kthread); | |
3f157a2f | 2437 | fail_cleaner: |
a74a4b97 | 2438 | kthread_stop(fs_info->cleaner_kthread); |
7c2ca468 CM |
2439 | |
2440 | /* | |
2441 | * make sure we're done with the btree inode before we stop our | |
2442 | * kthreads | |
2443 | */ | |
2444 | filemap_write_and_wait(fs_info->btree_inode->i_mapping); | |
2445 | invalidate_inode_pages2(fs_info->btree_inode->i_mapping); | |
2446 | ||
1b1d1f66 JB |
2447 | fail_block_groups: |
2448 | btrfs_free_block_groups(fs_info); | |
af31f5e5 CM |
2449 | |
2450 | fail_tree_roots: | |
2451 | free_root_pointers(fs_info, 1); | |
2452 | ||
39279cc3 | 2453 | fail_sb_buffer: |
61d92c32 | 2454 | btrfs_stop_workers(&fs_info->generic_worker); |
306c8b68 | 2455 | btrfs_stop_workers(&fs_info->readahead_workers); |
247e743c | 2456 | btrfs_stop_workers(&fs_info->fixup_workers); |
771ed689 | 2457 | btrfs_stop_workers(&fs_info->delalloc_workers); |
8b712842 CM |
2458 | btrfs_stop_workers(&fs_info->workers); |
2459 | btrfs_stop_workers(&fs_info->endio_workers); | |
d20f7043 | 2460 | btrfs_stop_workers(&fs_info->endio_meta_workers); |
cad321ad | 2461 | btrfs_stop_workers(&fs_info->endio_meta_write_workers); |
e6dcd2dc | 2462 | btrfs_stop_workers(&fs_info->endio_write_workers); |
0cb59c99 | 2463 | btrfs_stop_workers(&fs_info->endio_freespace_worker); |
1cc127b5 | 2464 | btrfs_stop_workers(&fs_info->submit_workers); |
16cdcec7 | 2465 | btrfs_stop_workers(&fs_info->delayed_workers); |
bab39bf9 | 2466 | btrfs_stop_workers(&fs_info->caching_workers); |
16cdcec7 | 2467 | fail_alloc: |
4543df7e | 2468 | fail_iput: |
586e46e2 ID |
2469 | btrfs_mapping_tree_free(&fs_info->mapping_tree); |
2470 | ||
7c2ca468 | 2471 | invalidate_inode_pages2(fs_info->btree_inode->i_mapping); |
4543df7e | 2472 | iput(fs_info->btree_inode); |
ad081f14 | 2473 | fail_bdi: |
7e662854 | 2474 | bdi_destroy(&fs_info->bdi); |
76dda93c YZ |
2475 | fail_srcu: |
2476 | cleanup_srcu_struct(&fs_info->subvol_srcu); | |
7e662854 | 2477 | fail: |
586e46e2 | 2478 | btrfs_close_devices(fs_info->fs_devices); |
ad2b2c80 | 2479 | return err; |
af31f5e5 CM |
2480 | |
2481 | recovery_tree_root: | |
af31f5e5 CM |
2482 | if (!btrfs_test_opt(tree_root, RECOVERY)) |
2483 | goto fail_tree_roots; | |
2484 | ||
2485 | free_root_pointers(fs_info, 0); | |
2486 | ||
2487 | /* don't use the log in recovery mode, it won't be valid */ | |
2488 | btrfs_set_super_log_root(disk_super, 0); | |
2489 | ||
2490 | /* we can't trust the free space cache either */ | |
2491 | btrfs_set_opt(fs_info->mount_opt, CLEAR_CACHE); | |
2492 | ||
2493 | ret = next_root_backup(fs_info, fs_info->super_copy, | |
2494 | &num_backups_tried, &backup_index); | |
2495 | if (ret == -1) | |
2496 | goto fail_block_groups; | |
2497 | goto retry_root_backup; | |
eb60ceac CM |
2498 | } |
2499 | ||
f2984462 CM |
2500 | static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) |
2501 | { | |
2502 | char b[BDEVNAME_SIZE]; | |
2503 | ||
2504 | if (uptodate) { | |
2505 | set_buffer_uptodate(bh); | |
2506 | } else { | |
7a36ddec | 2507 | printk_ratelimited(KERN_WARNING "lost page write due to " |
f2984462 CM |
2508 | "I/O error on %s\n", |
2509 | bdevname(bh->b_bdev, b)); | |
1259ab75 CM |
2510 | /* note, we dont' set_buffer_write_io_error because we have |
2511 | * our own ways of dealing with the IO errors | |
2512 | */ | |
f2984462 CM |
2513 | clear_buffer_uptodate(bh); |
2514 | } | |
2515 | unlock_buffer(bh); | |
2516 | put_bh(bh); | |
2517 | } | |
2518 | ||
a512bbf8 YZ |
2519 | struct buffer_head *btrfs_read_dev_super(struct block_device *bdev) |
2520 | { | |
2521 | struct buffer_head *bh; | |
2522 | struct buffer_head *latest = NULL; | |
2523 | struct btrfs_super_block *super; | |
2524 | int i; | |
2525 | u64 transid = 0; | |
2526 | u64 bytenr; | |
2527 | ||
2528 | /* we would like to check all the supers, but that would make | |
2529 | * a btrfs mount succeed after a mkfs from a different FS. | |
2530 | * So, we need to add a special mount option to scan for | |
2531 | * later supers, using BTRFS_SUPER_MIRROR_MAX instead | |
2532 | */ | |
2533 | for (i = 0; i < 1; i++) { | |
2534 | bytenr = btrfs_sb_offset(i); | |
2535 | if (bytenr + 4096 >= i_size_read(bdev->bd_inode)) | |
2536 | break; | |
2537 | bh = __bread(bdev, bytenr / 4096, 4096); | |
2538 | if (!bh) | |
2539 | continue; | |
2540 | ||
2541 | super = (struct btrfs_super_block *)bh->b_data; | |
2542 | if (btrfs_super_bytenr(super) != bytenr || | |
2543 | strncmp((char *)(&super->magic), BTRFS_MAGIC, | |
2544 | sizeof(super->magic))) { | |
2545 | brelse(bh); | |
2546 | continue; | |
2547 | } | |
2548 | ||
2549 | if (!latest || btrfs_super_generation(super) > transid) { | |
2550 | brelse(latest); | |
2551 | latest = bh; | |
2552 | transid = btrfs_super_generation(super); | |
2553 | } else { | |
2554 | brelse(bh); | |
2555 | } | |
2556 | } | |
2557 | return latest; | |
2558 | } | |
2559 | ||
4eedeb75 HH |
2560 | /* |
2561 | * this should be called twice, once with wait == 0 and | |
2562 | * once with wait == 1. When wait == 0 is done, all the buffer heads | |
2563 | * we write are pinned. | |
2564 | * | |
2565 | * They are released when wait == 1 is done. | |
2566 | * max_mirrors must be the same for both runs, and it indicates how | |
2567 | * many supers on this one device should be written. | |
2568 | * | |
2569 | * max_mirrors == 0 means to write them all. | |
2570 | */ | |
a512bbf8 YZ |
2571 | static int write_dev_supers(struct btrfs_device *device, |
2572 | struct btrfs_super_block *sb, | |
2573 | int do_barriers, int wait, int max_mirrors) | |
2574 | { | |
2575 | struct buffer_head *bh; | |
2576 | int i; | |
2577 | int ret; | |
2578 | int errors = 0; | |
2579 | u32 crc; | |
2580 | u64 bytenr; | |
a512bbf8 YZ |
2581 | |
2582 | if (max_mirrors == 0) | |
2583 | max_mirrors = BTRFS_SUPER_MIRROR_MAX; | |
2584 | ||
a512bbf8 YZ |
2585 | for (i = 0; i < max_mirrors; i++) { |
2586 | bytenr = btrfs_sb_offset(i); | |
2587 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes) | |
2588 | break; | |
2589 | ||
2590 | if (wait) { | |
2591 | bh = __find_get_block(device->bdev, bytenr / 4096, | |
2592 | BTRFS_SUPER_INFO_SIZE); | |
2593 | BUG_ON(!bh); | |
a512bbf8 | 2594 | wait_on_buffer(bh); |
4eedeb75 HH |
2595 | if (!buffer_uptodate(bh)) |
2596 | errors++; | |
2597 | ||
2598 | /* drop our reference */ | |
2599 | brelse(bh); | |
2600 | ||
2601 | /* drop the reference from the wait == 0 run */ | |
2602 | brelse(bh); | |
2603 | continue; | |
a512bbf8 YZ |
2604 | } else { |
2605 | btrfs_set_super_bytenr(sb, bytenr); | |
2606 | ||
2607 | crc = ~(u32)0; | |
2608 | crc = btrfs_csum_data(NULL, (char *)sb + | |
2609 | BTRFS_CSUM_SIZE, crc, | |
2610 | BTRFS_SUPER_INFO_SIZE - | |
2611 | BTRFS_CSUM_SIZE); | |
2612 | btrfs_csum_final(crc, sb->csum); | |
2613 | ||
4eedeb75 HH |
2614 | /* |
2615 | * one reference for us, and we leave it for the | |
2616 | * caller | |
2617 | */ | |
a512bbf8 YZ |
2618 | bh = __getblk(device->bdev, bytenr / 4096, |
2619 | BTRFS_SUPER_INFO_SIZE); | |
2620 | memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); | |
2621 | ||
4eedeb75 | 2622 | /* one reference for submit_bh */ |
a512bbf8 | 2623 | get_bh(bh); |
4eedeb75 HH |
2624 | |
2625 | set_buffer_uptodate(bh); | |
a512bbf8 YZ |
2626 | lock_buffer(bh); |
2627 | bh->b_end_io = btrfs_end_buffer_write_sync; | |
2628 | } | |
2629 | ||
387125fc CM |
2630 | /* |
2631 | * we fua the first super. The others we allow | |
2632 | * to go down lazy. | |
2633 | */ | |
21adbd5c | 2634 | ret = btrfsic_submit_bh(WRITE_FUA, bh); |
4eedeb75 | 2635 | if (ret) |
a512bbf8 | 2636 | errors++; |
a512bbf8 YZ |
2637 | } |
2638 | return errors < i ? 0 : -1; | |
2639 | } | |
2640 | ||
387125fc CM |
2641 | /* |
2642 | * endio for the write_dev_flush, this will wake anyone waiting | |
2643 | * for the barrier when it is done | |
2644 | */ | |
2645 | static void btrfs_end_empty_barrier(struct bio *bio, int err) | |
2646 | { | |
2647 | if (err) { | |
2648 | if (err == -EOPNOTSUPP) | |
2649 | set_bit(BIO_EOPNOTSUPP, &bio->bi_flags); | |
2650 | clear_bit(BIO_UPTODATE, &bio->bi_flags); | |
2651 | } | |
2652 | if (bio->bi_private) | |
2653 | complete(bio->bi_private); | |
2654 | bio_put(bio); | |
2655 | } | |
2656 | ||
2657 | /* | |
2658 | * trigger flushes for one the devices. If you pass wait == 0, the flushes are | |
2659 | * sent down. With wait == 1, it waits for the previous flush. | |
2660 | * | |
2661 | * any device where the flush fails with eopnotsupp are flagged as not-barrier | |
2662 | * capable | |
2663 | */ | |
2664 | static int write_dev_flush(struct btrfs_device *device, int wait) | |
2665 | { | |
2666 | struct bio *bio; | |
2667 | int ret = 0; | |
2668 | ||
2669 | if (device->nobarriers) | |
2670 | return 0; | |
2671 | ||
2672 | if (wait) { | |
2673 | bio = device->flush_bio; | |
2674 | if (!bio) | |
2675 | return 0; | |
2676 | ||
2677 | wait_for_completion(&device->flush_wait); | |
2678 | ||
2679 | if (bio_flagged(bio, BIO_EOPNOTSUPP)) { | |
2680 | printk("btrfs: disabling barriers on dev %s\n", | |
2681 | device->name); | |
2682 | device->nobarriers = 1; | |
2683 | } | |
2684 | if (!bio_flagged(bio, BIO_UPTODATE)) { | |
2685 | ret = -EIO; | |
2686 | } | |
2687 | ||
2688 | /* drop the reference from the wait == 0 run */ | |
2689 | bio_put(bio); | |
2690 | device->flush_bio = NULL; | |
2691 | ||
2692 | return ret; | |
2693 | } | |
2694 | ||
2695 | /* | |
2696 | * one reference for us, and we leave it for the | |
2697 | * caller | |
2698 | */ | |
2699 | device->flush_bio = NULL;; | |
2700 | bio = bio_alloc(GFP_NOFS, 0); | |
2701 | if (!bio) | |
2702 | return -ENOMEM; | |
2703 | ||
2704 | bio->bi_end_io = btrfs_end_empty_barrier; | |
2705 | bio->bi_bdev = device->bdev; | |
2706 | init_completion(&device->flush_wait); | |
2707 | bio->bi_private = &device->flush_wait; | |
2708 | device->flush_bio = bio; | |
2709 | ||
2710 | bio_get(bio); | |
21adbd5c | 2711 | btrfsic_submit_bio(WRITE_FLUSH, bio); |
387125fc CM |
2712 | |
2713 | return 0; | |
2714 | } | |
2715 | ||
2716 | /* | |
2717 | * send an empty flush down to each device in parallel, | |
2718 | * then wait for them | |
2719 | */ | |
2720 | static int barrier_all_devices(struct btrfs_fs_info *info) | |
2721 | { | |
2722 | struct list_head *head; | |
2723 | struct btrfs_device *dev; | |
2724 | int errors = 0; | |
2725 | int ret; | |
2726 | ||
2727 | /* send down all the barriers */ | |
2728 | head = &info->fs_devices->devices; | |
2729 | list_for_each_entry_rcu(dev, head, dev_list) { | |
2730 | if (!dev->bdev) { | |
2731 | errors++; | |
2732 | continue; | |
2733 | } | |
2734 | if (!dev->in_fs_metadata || !dev->writeable) | |
2735 | continue; | |
2736 | ||
2737 | ret = write_dev_flush(dev, 0); | |
2738 | if (ret) | |
2739 | errors++; | |
2740 | } | |
2741 | ||
2742 | /* wait for all the barriers */ | |
2743 | list_for_each_entry_rcu(dev, head, dev_list) { | |
2744 | if (!dev->bdev) { | |
2745 | errors++; | |
2746 | continue; | |
2747 | } | |
2748 | if (!dev->in_fs_metadata || !dev->writeable) | |
2749 | continue; | |
2750 | ||
2751 | ret = write_dev_flush(dev, 1); | |
2752 | if (ret) | |
2753 | errors++; | |
2754 | } | |
2755 | if (errors) | |
2756 | return -EIO; | |
2757 | return 0; | |
2758 | } | |
2759 | ||
a512bbf8 | 2760 | int write_all_supers(struct btrfs_root *root, int max_mirrors) |
f2984462 | 2761 | { |
e5e9a520 | 2762 | struct list_head *head; |
f2984462 | 2763 | struct btrfs_device *dev; |
a061fc8d | 2764 | struct btrfs_super_block *sb; |
f2984462 | 2765 | struct btrfs_dev_item *dev_item; |
f2984462 CM |
2766 | int ret; |
2767 | int do_barriers; | |
a236aed1 CM |
2768 | int max_errors; |
2769 | int total_errors = 0; | |
a061fc8d | 2770 | u64 flags; |
f2984462 | 2771 | |
6c41761f | 2772 | max_errors = btrfs_super_num_devices(root->fs_info->super_copy) - 1; |
f2984462 | 2773 | do_barriers = !btrfs_test_opt(root, NOBARRIER); |
af31f5e5 | 2774 | backup_super_roots(root->fs_info); |
f2984462 | 2775 | |
6c41761f | 2776 | sb = root->fs_info->super_for_commit; |
a061fc8d | 2777 | dev_item = &sb->dev_item; |
e5e9a520 | 2778 | |
174ba509 | 2779 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); |
e5e9a520 | 2780 | head = &root->fs_info->fs_devices->devices; |
387125fc CM |
2781 | |
2782 | if (do_barriers) | |
2783 | barrier_all_devices(root->fs_info); | |
2784 | ||
1f78160c | 2785 | list_for_each_entry_rcu(dev, head, dev_list) { |
dfe25020 CM |
2786 | if (!dev->bdev) { |
2787 | total_errors++; | |
2788 | continue; | |
2789 | } | |
2b82032c | 2790 | if (!dev->in_fs_metadata || !dev->writeable) |
dfe25020 CM |
2791 | continue; |
2792 | ||
2b82032c | 2793 | btrfs_set_stack_device_generation(dev_item, 0); |
a061fc8d CM |
2794 | btrfs_set_stack_device_type(dev_item, dev->type); |
2795 | btrfs_set_stack_device_id(dev_item, dev->devid); | |
2796 | btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); | |
2797 | btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); | |
2798 | btrfs_set_stack_device_io_align(dev_item, dev->io_align); | |
2799 | btrfs_set_stack_device_io_width(dev_item, dev->io_width); | |
2800 | btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); | |
2801 | memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); | |
2b82032c | 2802 | memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); |
a512bbf8 | 2803 | |
a061fc8d CM |
2804 | flags = btrfs_super_flags(sb); |
2805 | btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); | |
2806 | ||
a512bbf8 | 2807 | ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors); |
a236aed1 CM |
2808 | if (ret) |
2809 | total_errors++; | |
f2984462 | 2810 | } |
a236aed1 | 2811 | if (total_errors > max_errors) { |
d397712b CM |
2812 | printk(KERN_ERR "btrfs: %d errors while writing supers\n", |
2813 | total_errors); | |
a236aed1 CM |
2814 | BUG(); |
2815 | } | |
f2984462 | 2816 | |
a512bbf8 | 2817 | total_errors = 0; |
1f78160c | 2818 | list_for_each_entry_rcu(dev, head, dev_list) { |
dfe25020 CM |
2819 | if (!dev->bdev) |
2820 | continue; | |
2b82032c | 2821 | if (!dev->in_fs_metadata || !dev->writeable) |
dfe25020 CM |
2822 | continue; |
2823 | ||
a512bbf8 YZ |
2824 | ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors); |
2825 | if (ret) | |
2826 | total_errors++; | |
f2984462 | 2827 | } |
174ba509 | 2828 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
a236aed1 | 2829 | if (total_errors > max_errors) { |
d397712b CM |
2830 | printk(KERN_ERR "btrfs: %d errors while writing supers\n", |
2831 | total_errors); | |
a236aed1 CM |
2832 | BUG(); |
2833 | } | |
f2984462 CM |
2834 | return 0; |
2835 | } | |
2836 | ||
a512bbf8 YZ |
2837 | int write_ctree_super(struct btrfs_trans_handle *trans, |
2838 | struct btrfs_root *root, int max_mirrors) | |
eb60ceac | 2839 | { |
e66f709b | 2840 | int ret; |
5f39d397 | 2841 | |
a512bbf8 | 2842 | ret = write_all_supers(root, max_mirrors); |
5f39d397 | 2843 | return ret; |
cfaa7295 CM |
2844 | } |
2845 | ||
5eda7b5e | 2846 | int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) |
2619ba1f | 2847 | { |
4df27c4d | 2848 | spin_lock(&fs_info->fs_roots_radix_lock); |
2619ba1f CM |
2849 | radix_tree_delete(&fs_info->fs_roots_radix, |
2850 | (unsigned long)root->root_key.objectid); | |
4df27c4d | 2851 | spin_unlock(&fs_info->fs_roots_radix_lock); |
76dda93c YZ |
2852 | |
2853 | if (btrfs_root_refs(&root->root_item) == 0) | |
2854 | synchronize_srcu(&fs_info->subvol_srcu); | |
2855 | ||
581bb050 LZ |
2856 | __btrfs_remove_free_space_cache(root->free_ino_pinned); |
2857 | __btrfs_remove_free_space_cache(root->free_ino_ctl); | |
4df27c4d YZ |
2858 | free_fs_root(root); |
2859 | return 0; | |
2860 | } | |
2861 | ||
2862 | static void free_fs_root(struct btrfs_root *root) | |
2863 | { | |
82d5902d | 2864 | iput(root->cache_inode); |
4df27c4d | 2865 | WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree)); |
0ee5dc67 AV |
2866 | if (root->anon_dev) |
2867 | free_anon_bdev(root->anon_dev); | |
4df27c4d YZ |
2868 | free_extent_buffer(root->node); |
2869 | free_extent_buffer(root->commit_root); | |
581bb050 LZ |
2870 | kfree(root->free_ino_ctl); |
2871 | kfree(root->free_ino_pinned); | |
d397712b | 2872 | kfree(root->name); |
2619ba1f | 2873 | kfree(root); |
2619ba1f CM |
2874 | } |
2875 | ||
35b7e476 | 2876 | static int del_fs_roots(struct btrfs_fs_info *fs_info) |
0f7d52f4 CM |
2877 | { |
2878 | int ret; | |
2879 | struct btrfs_root *gang[8]; | |
2880 | int i; | |
2881 | ||
76dda93c YZ |
2882 | while (!list_empty(&fs_info->dead_roots)) { |
2883 | gang[0] = list_entry(fs_info->dead_roots.next, | |
2884 | struct btrfs_root, root_list); | |
2885 | list_del(&gang[0]->root_list); | |
2886 | ||
2887 | if (gang[0]->in_radix) { | |
2888 | btrfs_free_fs_root(fs_info, gang[0]); | |
2889 | } else { | |
2890 | free_extent_buffer(gang[0]->node); | |
2891 | free_extent_buffer(gang[0]->commit_root); | |
2892 | kfree(gang[0]); | |
2893 | } | |
2894 | } | |
2895 | ||
d397712b | 2896 | while (1) { |
0f7d52f4 CM |
2897 | ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, |
2898 | (void **)gang, 0, | |
2899 | ARRAY_SIZE(gang)); | |
2900 | if (!ret) | |
2901 | break; | |
2619ba1f | 2902 | for (i = 0; i < ret; i++) |
5eda7b5e | 2903 | btrfs_free_fs_root(fs_info, gang[i]); |
0f7d52f4 CM |
2904 | } |
2905 | return 0; | |
2906 | } | |
b4100d64 | 2907 | |
c146afad | 2908 | int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) |
cfaa7295 | 2909 | { |
c146afad YZ |
2910 | u64 root_objectid = 0; |
2911 | struct btrfs_root *gang[8]; | |
2912 | int i; | |
3768f368 | 2913 | int ret; |
e089f05c | 2914 | |
c146afad YZ |
2915 | while (1) { |
2916 | ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, | |
2917 | (void **)gang, root_objectid, | |
2918 | ARRAY_SIZE(gang)); | |
2919 | if (!ret) | |
2920 | break; | |
5d4f98a2 YZ |
2921 | |
2922 | root_objectid = gang[ret - 1]->root_key.objectid + 1; | |
c146afad | 2923 | for (i = 0; i < ret; i++) { |
66b4ffd1 JB |
2924 | int err; |
2925 | ||
c146afad | 2926 | root_objectid = gang[i]->root_key.objectid; |
66b4ffd1 JB |
2927 | err = btrfs_orphan_cleanup(gang[i]); |
2928 | if (err) | |
2929 | return err; | |
c146afad YZ |
2930 | } |
2931 | root_objectid++; | |
2932 | } | |
2933 | return 0; | |
2934 | } | |
a2135011 | 2935 | |
c146afad YZ |
2936 | int btrfs_commit_super(struct btrfs_root *root) |
2937 | { | |
2938 | struct btrfs_trans_handle *trans; | |
2939 | int ret; | |
a74a4b97 | 2940 | |
c146afad | 2941 | mutex_lock(&root->fs_info->cleaner_mutex); |
24bbcf04 | 2942 | btrfs_run_delayed_iputs(root); |
a74a4b97 | 2943 | btrfs_clean_old_snapshots(root); |
c146afad | 2944 | mutex_unlock(&root->fs_info->cleaner_mutex); |
c71bf099 YZ |
2945 | |
2946 | /* wait until ongoing cleanup work done */ | |
2947 | down_write(&root->fs_info->cleanup_work_sem); | |
2948 | up_write(&root->fs_info->cleanup_work_sem); | |
2949 | ||
7a7eaa40 | 2950 | trans = btrfs_join_transaction(root); |
3612b495 TI |
2951 | if (IS_ERR(trans)) |
2952 | return PTR_ERR(trans); | |
54aa1f4d | 2953 | ret = btrfs_commit_transaction(trans, root); |
c146afad YZ |
2954 | BUG_ON(ret); |
2955 | /* run commit again to drop the original snapshot */ | |
7a7eaa40 | 2956 | trans = btrfs_join_transaction(root); |
3612b495 TI |
2957 | if (IS_ERR(trans)) |
2958 | return PTR_ERR(trans); | |
79154b1b CM |
2959 | btrfs_commit_transaction(trans, root); |
2960 | ret = btrfs_write_and_wait_transaction(NULL, root); | |
3768f368 | 2961 | BUG_ON(ret); |
d6bfde87 | 2962 | |
a512bbf8 | 2963 | ret = write_ctree_super(NULL, root, 0); |
c146afad YZ |
2964 | return ret; |
2965 | } | |
2966 | ||
2967 | int close_ctree(struct btrfs_root *root) | |
2968 | { | |
2969 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2970 | int ret; | |
2971 | ||
2972 | fs_info->closing = 1; | |
2973 | smp_mb(); | |
2974 | ||
837d5b6e ID |
2975 | /* pause restriper - we want to resume on mount */ |
2976 | btrfs_pause_balance(root->fs_info); | |
2977 | ||
a2de733c | 2978 | btrfs_scrub_cancel(root); |
4cb5300b CM |
2979 | |
2980 | /* wait for any defraggers to finish */ | |
2981 | wait_event(fs_info->transaction_wait, | |
2982 | (atomic_read(&fs_info->defrag_running) == 0)); | |
2983 | ||
2984 | /* clear out the rbtree of defraggable inodes */ | |
e3029d9f | 2985 | btrfs_run_defrag_inodes(fs_info); |
4cb5300b | 2986 | |
acce952b | 2987 | /* |
2988 | * Here come 2 situations when btrfs is broken to flip readonly: | |
2989 | * | |
2990 | * 1. when btrfs flips readonly somewhere else before | |
2991 | * btrfs_commit_super, sb->s_flags has MS_RDONLY flag, | |
2992 | * and btrfs will skip to write sb directly to keep | |
2993 | * ERROR state on disk. | |
2994 | * | |
2995 | * 2. when btrfs flips readonly just in btrfs_commit_super, | |
ae0e47f0 | 2996 | * and in such case, btrfs cannot write sb via btrfs_commit_super, |
acce952b | 2997 | * and since fs_state has been set BTRFS_SUPER_FLAG_ERROR flag, |
2998 | * btrfs will cleanup all FS resources first and write sb then. | |
2999 | */ | |
c146afad | 3000 | if (!(fs_info->sb->s_flags & MS_RDONLY)) { |
acce952b | 3001 | ret = btrfs_commit_super(root); |
3002 | if (ret) | |
3003 | printk(KERN_ERR "btrfs: commit super ret %d\n", ret); | |
3004 | } | |
3005 | ||
3006 | if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { | |
3007 | ret = btrfs_error_commit_super(root); | |
d397712b CM |
3008 | if (ret) |
3009 | printk(KERN_ERR "btrfs: commit super ret %d\n", ret); | |
c146afad | 3010 | } |
0f7d52f4 | 3011 | |
300e4f8a JB |
3012 | btrfs_put_block_group_cache(fs_info); |
3013 | ||
e3029d9f AV |
3014 | kthread_stop(fs_info->transaction_kthread); |
3015 | kthread_stop(fs_info->cleaner_kthread); | |
8929ecfa | 3016 | |
f25784b3 YZ |
3017 | fs_info->closing = 2; |
3018 | smp_mb(); | |
3019 | ||
b0c68f8b | 3020 | if (fs_info->delalloc_bytes) { |
d397712b | 3021 | printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n", |
21380931 | 3022 | (unsigned long long)fs_info->delalloc_bytes); |
b0c68f8b | 3023 | } |
31153d81 | 3024 | if (fs_info->total_ref_cache_size) { |
d397712b CM |
3025 | printk(KERN_INFO "btrfs: at umount reference cache size %llu\n", |
3026 | (unsigned long long)fs_info->total_ref_cache_size); | |
31153d81 | 3027 | } |
bcc63abb | 3028 | |
5d4f98a2 YZ |
3029 | free_extent_buffer(fs_info->extent_root->node); |
3030 | free_extent_buffer(fs_info->extent_root->commit_root); | |
3031 | free_extent_buffer(fs_info->tree_root->node); | |
3032 | free_extent_buffer(fs_info->tree_root->commit_root); | |
e3029d9f AV |
3033 | free_extent_buffer(fs_info->chunk_root->node); |
3034 | free_extent_buffer(fs_info->chunk_root->commit_root); | |
3035 | free_extent_buffer(fs_info->dev_root->node); | |
3036 | free_extent_buffer(fs_info->dev_root->commit_root); | |
3037 | free_extent_buffer(fs_info->csum_root->node); | |
3038 | free_extent_buffer(fs_info->csum_root->commit_root); | |
d20f7043 | 3039 | |
e3029d9f | 3040 | btrfs_free_block_groups(fs_info); |
d10c5f31 | 3041 | |
c146afad | 3042 | del_fs_roots(fs_info); |
d10c5f31 | 3043 | |
c146afad | 3044 | iput(fs_info->btree_inode); |
9ad6b7bc | 3045 | |
61d92c32 | 3046 | btrfs_stop_workers(&fs_info->generic_worker); |
247e743c | 3047 | btrfs_stop_workers(&fs_info->fixup_workers); |
771ed689 | 3048 | btrfs_stop_workers(&fs_info->delalloc_workers); |
8b712842 CM |
3049 | btrfs_stop_workers(&fs_info->workers); |
3050 | btrfs_stop_workers(&fs_info->endio_workers); | |
d20f7043 | 3051 | btrfs_stop_workers(&fs_info->endio_meta_workers); |
cad321ad | 3052 | btrfs_stop_workers(&fs_info->endio_meta_write_workers); |
e6dcd2dc | 3053 | btrfs_stop_workers(&fs_info->endio_write_workers); |
0cb59c99 | 3054 | btrfs_stop_workers(&fs_info->endio_freespace_worker); |
1cc127b5 | 3055 | btrfs_stop_workers(&fs_info->submit_workers); |
16cdcec7 | 3056 | btrfs_stop_workers(&fs_info->delayed_workers); |
bab39bf9 | 3057 | btrfs_stop_workers(&fs_info->caching_workers); |
90519d66 | 3058 | btrfs_stop_workers(&fs_info->readahead_workers); |
d6bfde87 | 3059 | |
21adbd5c SB |
3060 | #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY |
3061 | if (btrfs_test_opt(root, CHECK_INTEGRITY)) | |
3062 | btrfsic_unmount(root, fs_info->fs_devices); | |
3063 | #endif | |
3064 | ||
dfe25020 | 3065 | btrfs_close_devices(fs_info->fs_devices); |
0b86a832 | 3066 | btrfs_mapping_tree_free(&fs_info->mapping_tree); |
b248a415 | 3067 | |
04160088 | 3068 | bdi_destroy(&fs_info->bdi); |
76dda93c | 3069 | cleanup_srcu_struct(&fs_info->subvol_srcu); |
0b86a832 | 3070 | |
eb60ceac CM |
3071 | return 0; |
3072 | } | |
3073 | ||
1259ab75 | 3074 | int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) |
5f39d397 | 3075 | { |
1259ab75 | 3076 | int ret; |
727011e0 | 3077 | struct inode *btree_inode = buf->pages[0]->mapping->host; |
1259ab75 | 3078 | |
0b32f4bb | 3079 | ret = extent_buffer_uptodate(buf); |
1259ab75 CM |
3080 | if (!ret) |
3081 | return ret; | |
3082 | ||
3083 | ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, | |
3084 | parent_transid); | |
3085 | return !ret; | |
5f39d397 CM |
3086 | } |
3087 | ||
3088 | int btrfs_set_buffer_uptodate(struct extent_buffer *buf) | |
ccd467d6 | 3089 | { |
0b32f4bb | 3090 | return set_extent_buffer_uptodate(buf); |
5f39d397 | 3091 | } |
6702ed49 | 3092 | |
5f39d397 CM |
3093 | void btrfs_mark_buffer_dirty(struct extent_buffer *buf) |
3094 | { | |
727011e0 | 3095 | struct btrfs_root *root = BTRFS_I(buf->pages[0]->mapping->host)->root; |
5f39d397 | 3096 | u64 transid = btrfs_header_generation(buf); |
b9473439 | 3097 | int was_dirty; |
b4ce94de | 3098 | |
b9447ef8 | 3099 | btrfs_assert_tree_locked(buf); |
ccd467d6 | 3100 | if (transid != root->fs_info->generation) { |
d397712b CM |
3101 | printk(KERN_CRIT "btrfs transid mismatch buffer %llu, " |
3102 | "found %llu running %llu\n", | |
db94535d | 3103 | (unsigned long long)buf->start, |
d397712b CM |
3104 | (unsigned long long)transid, |
3105 | (unsigned long long)root->fs_info->generation); | |
ccd467d6 CM |
3106 | WARN_ON(1); |
3107 | } | |
0b32f4bb | 3108 | was_dirty = set_extent_buffer_dirty(buf); |
b9473439 CM |
3109 | if (!was_dirty) { |
3110 | spin_lock(&root->fs_info->delalloc_lock); | |
3111 | root->fs_info->dirty_metadata_bytes += buf->len; | |
3112 | spin_unlock(&root->fs_info->delalloc_lock); | |
3113 | } | |
eb60ceac CM |
3114 | } |
3115 | ||
d3c2fdcf | 3116 | void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) |
16cdcec7 MX |
3117 | { |
3118 | /* | |
3119 | * looks as though older kernels can get into trouble with | |
3120 | * this code, they end up stuck in balance_dirty_pages forever | |
3121 | */ | |
3122 | u64 num_dirty; | |
3123 | unsigned long thresh = 32 * 1024 * 1024; | |
3124 | ||
3125 | if (current->flags & PF_MEMALLOC) | |
3126 | return; | |
3127 | ||
3128 | btrfs_balance_delayed_items(root); | |
3129 | ||
3130 | num_dirty = root->fs_info->dirty_metadata_bytes; | |
3131 | ||
3132 | if (num_dirty > thresh) { | |
3133 | balance_dirty_pages_ratelimited_nr( | |
3134 | root->fs_info->btree_inode->i_mapping, 1); | |
3135 | } | |
3136 | return; | |
3137 | } | |
3138 | ||
3139 | void __btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) | |
35b7e476 | 3140 | { |
188de649 CM |
3141 | /* |
3142 | * looks as though older kernels can get into trouble with | |
3143 | * this code, they end up stuck in balance_dirty_pages forever | |
3144 | */ | |
d6bfde87 | 3145 | u64 num_dirty; |
771ed689 | 3146 | unsigned long thresh = 32 * 1024 * 1024; |
d6bfde87 | 3147 | |
6933c02e | 3148 | if (current->flags & PF_MEMALLOC) |
d6bfde87 CM |
3149 | return; |
3150 | ||
585ad2c3 CM |
3151 | num_dirty = root->fs_info->dirty_metadata_bytes; |
3152 | ||
d6bfde87 CM |
3153 | if (num_dirty > thresh) { |
3154 | balance_dirty_pages_ratelimited_nr( | |
d7fc640e | 3155 | root->fs_info->btree_inode->i_mapping, 1); |
d6bfde87 | 3156 | } |
188de649 | 3157 | return; |
35b7e476 | 3158 | } |
6b80053d | 3159 | |
ca7a79ad | 3160 | int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) |
6b80053d | 3161 | { |
727011e0 | 3162 | struct btrfs_root *root = BTRFS_I(buf->pages[0]->mapping->host)->root; |
0b32f4bb | 3163 | return btree_read_extent_buffer_pages(root, buf, 0, parent_transid); |
6b80053d | 3164 | } |
0da5468f | 3165 | |
01d658f2 CM |
3166 | static int btree_lock_page_hook(struct page *page, void *data, |
3167 | void (*flush_fn)(void *)) | |
4bef0848 CM |
3168 | { |
3169 | struct inode *inode = page->mapping->host; | |
b9473439 | 3170 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4bef0848 | 3171 | struct extent_buffer *eb; |
4bef0848 | 3172 | |
4f2de97a JB |
3173 | /* |
3174 | * We culled this eb but the page is still hanging out on the mapping, | |
3175 | * carry on. | |
3176 | */ | |
3177 | if (!PagePrivate(page)) | |
4bef0848 CM |
3178 | goto out; |
3179 | ||
4f2de97a JB |
3180 | eb = (struct extent_buffer *)page->private; |
3181 | if (!eb) { | |
3182 | WARN_ON(1); | |
3183 | goto out; | |
3184 | } | |
3185 | if (page != eb->pages[0]) | |
4bef0848 CM |
3186 | goto out; |
3187 | ||
01d658f2 CM |
3188 | if (!btrfs_try_tree_write_lock(eb)) { |
3189 | flush_fn(data); | |
3190 | btrfs_tree_lock(eb); | |
3191 | } | |
4bef0848 | 3192 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
b9473439 CM |
3193 | |
3194 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { | |
3195 | spin_lock(&root->fs_info->delalloc_lock); | |
3196 | if (root->fs_info->dirty_metadata_bytes >= eb->len) | |
3197 | root->fs_info->dirty_metadata_bytes -= eb->len; | |
3198 | else | |
3199 | WARN_ON(1); | |
3200 | spin_unlock(&root->fs_info->delalloc_lock); | |
3201 | } | |
3202 | ||
4bef0848 | 3203 | btrfs_tree_unlock(eb); |
4bef0848 | 3204 | out: |
01d658f2 CM |
3205 | if (!trylock_page(page)) { |
3206 | flush_fn(data); | |
3207 | lock_page(page); | |
3208 | } | |
4bef0848 CM |
3209 | return 0; |
3210 | } | |
3211 | ||
acce952b | 3212 | static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info, |
3213 | int read_only) | |
3214 | { | |
3215 | if (read_only) | |
3216 | return; | |
3217 | ||
3218 | if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) | |
3219 | printk(KERN_WARNING "warning: mount fs with errors, " | |
3220 | "running btrfsck is recommended\n"); | |
3221 | } | |
3222 | ||
3223 | int btrfs_error_commit_super(struct btrfs_root *root) | |
3224 | { | |
3225 | int ret; | |
3226 | ||
3227 | mutex_lock(&root->fs_info->cleaner_mutex); | |
3228 | btrfs_run_delayed_iputs(root); | |
3229 | mutex_unlock(&root->fs_info->cleaner_mutex); | |
3230 | ||
3231 | down_write(&root->fs_info->cleanup_work_sem); | |
3232 | up_write(&root->fs_info->cleanup_work_sem); | |
3233 | ||
3234 | /* cleanup FS via transaction */ | |
3235 | btrfs_cleanup_transaction(root); | |
3236 | ||
3237 | ret = write_ctree_super(NULL, root, 0); | |
3238 | ||
3239 | return ret; | |
3240 | } | |
3241 | ||
3242 | static int btrfs_destroy_ordered_operations(struct btrfs_root *root) | |
3243 | { | |
3244 | struct btrfs_inode *btrfs_inode; | |
3245 | struct list_head splice; | |
3246 | ||
3247 | INIT_LIST_HEAD(&splice); | |
3248 | ||
3249 | mutex_lock(&root->fs_info->ordered_operations_mutex); | |
3250 | spin_lock(&root->fs_info->ordered_extent_lock); | |
3251 | ||
3252 | list_splice_init(&root->fs_info->ordered_operations, &splice); | |
3253 | while (!list_empty(&splice)) { | |
3254 | btrfs_inode = list_entry(splice.next, struct btrfs_inode, | |
3255 | ordered_operations); | |
3256 | ||
3257 | list_del_init(&btrfs_inode->ordered_operations); | |
3258 | ||
3259 | btrfs_invalidate_inodes(btrfs_inode->root); | |
3260 | } | |
3261 | ||
3262 | spin_unlock(&root->fs_info->ordered_extent_lock); | |
3263 | mutex_unlock(&root->fs_info->ordered_operations_mutex); | |
3264 | ||
3265 | return 0; | |
3266 | } | |
3267 | ||
3268 | static int btrfs_destroy_ordered_extents(struct btrfs_root *root) | |
3269 | { | |
3270 | struct list_head splice; | |
3271 | struct btrfs_ordered_extent *ordered; | |
3272 | struct inode *inode; | |
3273 | ||
3274 | INIT_LIST_HEAD(&splice); | |
3275 | ||
3276 | spin_lock(&root->fs_info->ordered_extent_lock); | |
3277 | ||
3278 | list_splice_init(&root->fs_info->ordered_extents, &splice); | |
3279 | while (!list_empty(&splice)) { | |
3280 | ordered = list_entry(splice.next, struct btrfs_ordered_extent, | |
3281 | root_extent_list); | |
3282 | ||
3283 | list_del_init(&ordered->root_extent_list); | |
3284 | atomic_inc(&ordered->refs); | |
3285 | ||
3286 | /* the inode may be getting freed (in sys_unlink path). */ | |
3287 | inode = igrab(ordered->inode); | |
3288 | ||
3289 | spin_unlock(&root->fs_info->ordered_extent_lock); | |
3290 | if (inode) | |
3291 | iput(inode); | |
3292 | ||
3293 | atomic_set(&ordered->refs, 1); | |
3294 | btrfs_put_ordered_extent(ordered); | |
3295 | ||
3296 | spin_lock(&root->fs_info->ordered_extent_lock); | |
3297 | } | |
3298 | ||
3299 | spin_unlock(&root->fs_info->ordered_extent_lock); | |
3300 | ||
3301 | return 0; | |
3302 | } | |
3303 | ||
3304 | static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, | |
3305 | struct btrfs_root *root) | |
3306 | { | |
3307 | struct rb_node *node; | |
3308 | struct btrfs_delayed_ref_root *delayed_refs; | |
3309 | struct btrfs_delayed_ref_node *ref; | |
3310 | int ret = 0; | |
3311 | ||
3312 | delayed_refs = &trans->delayed_refs; | |
3313 | ||
3314 | spin_lock(&delayed_refs->lock); | |
3315 | if (delayed_refs->num_entries == 0) { | |
cfece4db | 3316 | spin_unlock(&delayed_refs->lock); |
acce952b | 3317 | printk(KERN_INFO "delayed_refs has NO entry\n"); |
3318 | return ret; | |
3319 | } | |
3320 | ||
3321 | node = rb_first(&delayed_refs->root); | |
3322 | while (node) { | |
3323 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
3324 | node = rb_next(node); | |
3325 | ||
3326 | ref->in_tree = 0; | |
3327 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
3328 | delayed_refs->num_entries--; | |
3329 | ||
3330 | atomic_set(&ref->refs, 1); | |
3331 | if (btrfs_delayed_ref_is_head(ref)) { | |
3332 | struct btrfs_delayed_ref_head *head; | |
3333 | ||
3334 | head = btrfs_delayed_node_to_head(ref); | |
3335 | mutex_lock(&head->mutex); | |
3336 | kfree(head->extent_op); | |
3337 | delayed_refs->num_heads--; | |
3338 | if (list_empty(&head->cluster)) | |
3339 | delayed_refs->num_heads_ready--; | |
3340 | list_del_init(&head->cluster); | |
3341 | mutex_unlock(&head->mutex); | |
3342 | } | |
3343 | ||
3344 | spin_unlock(&delayed_refs->lock); | |
3345 | btrfs_put_delayed_ref(ref); | |
3346 | ||
3347 | cond_resched(); | |
3348 | spin_lock(&delayed_refs->lock); | |
3349 | } | |
3350 | ||
3351 | spin_unlock(&delayed_refs->lock); | |
3352 | ||
3353 | return ret; | |
3354 | } | |
3355 | ||
3356 | static int btrfs_destroy_pending_snapshots(struct btrfs_transaction *t) | |
3357 | { | |
3358 | struct btrfs_pending_snapshot *snapshot; | |
3359 | struct list_head splice; | |
3360 | ||
3361 | INIT_LIST_HEAD(&splice); | |
3362 | ||
3363 | list_splice_init(&t->pending_snapshots, &splice); | |
3364 | ||
3365 | while (!list_empty(&splice)) { | |
3366 | snapshot = list_entry(splice.next, | |
3367 | struct btrfs_pending_snapshot, | |
3368 | list); | |
3369 | ||
3370 | list_del_init(&snapshot->list); | |
3371 | ||
3372 | kfree(snapshot); | |
3373 | } | |
3374 | ||
3375 | return 0; | |
3376 | } | |
3377 | ||
3378 | static int btrfs_destroy_delalloc_inodes(struct btrfs_root *root) | |
3379 | { | |
3380 | struct btrfs_inode *btrfs_inode; | |
3381 | struct list_head splice; | |
3382 | ||
3383 | INIT_LIST_HEAD(&splice); | |
3384 | ||
acce952b | 3385 | spin_lock(&root->fs_info->delalloc_lock); |
5be76758 | 3386 | list_splice_init(&root->fs_info->delalloc_inodes, &splice); |
acce952b | 3387 | |
3388 | while (!list_empty(&splice)) { | |
3389 | btrfs_inode = list_entry(splice.next, struct btrfs_inode, | |
3390 | delalloc_inodes); | |
3391 | ||
3392 | list_del_init(&btrfs_inode->delalloc_inodes); | |
3393 | ||
3394 | btrfs_invalidate_inodes(btrfs_inode->root); | |
3395 | } | |
3396 | ||
3397 | spin_unlock(&root->fs_info->delalloc_lock); | |
3398 | ||
3399 | return 0; | |
3400 | } | |
3401 | ||
3402 | static int btrfs_destroy_marked_extents(struct btrfs_root *root, | |
3403 | struct extent_io_tree *dirty_pages, | |
3404 | int mark) | |
3405 | { | |
3406 | int ret; | |
3407 | struct page *page; | |
3408 | struct inode *btree_inode = root->fs_info->btree_inode; | |
3409 | struct extent_buffer *eb; | |
3410 | u64 start = 0; | |
3411 | u64 end; | |
3412 | u64 offset; | |
3413 | unsigned long index; | |
3414 | ||
3415 | while (1) { | |
3416 | ret = find_first_extent_bit(dirty_pages, start, &start, &end, | |
3417 | mark); | |
3418 | if (ret) | |
3419 | break; | |
3420 | ||
3421 | clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS); | |
3422 | while (start <= end) { | |
3423 | index = start >> PAGE_CACHE_SHIFT; | |
3424 | start = (u64)(index + 1) << PAGE_CACHE_SHIFT; | |
3425 | page = find_get_page(btree_inode->i_mapping, index); | |
3426 | if (!page) | |
3427 | continue; | |
3428 | offset = page_offset(page); | |
3429 | ||
3430 | spin_lock(&dirty_pages->buffer_lock); | |
3431 | eb = radix_tree_lookup( | |
3432 | &(&BTRFS_I(page->mapping->host)->io_tree)->buffer, | |
3433 | offset >> PAGE_CACHE_SHIFT); | |
3434 | spin_unlock(&dirty_pages->buffer_lock); | |
3435 | if (eb) { | |
3436 | ret = test_and_clear_bit(EXTENT_BUFFER_DIRTY, | |
3437 | &eb->bflags); | |
3438 | atomic_set(&eb->refs, 1); | |
3439 | } | |
3440 | if (PageWriteback(page)) | |
3441 | end_page_writeback(page); | |
3442 | ||
3443 | lock_page(page); | |
3444 | if (PageDirty(page)) { | |
3445 | clear_page_dirty_for_io(page); | |
3446 | spin_lock_irq(&page->mapping->tree_lock); | |
3447 | radix_tree_tag_clear(&page->mapping->page_tree, | |
3448 | page_index(page), | |
3449 | PAGECACHE_TAG_DIRTY); | |
3450 | spin_unlock_irq(&page->mapping->tree_lock); | |
3451 | } | |
3452 | ||
3453 | page->mapping->a_ops->invalidatepage(page, 0); | |
3454 | unlock_page(page); | |
3455 | } | |
3456 | } | |
3457 | ||
3458 | return ret; | |
3459 | } | |
3460 | ||
3461 | static int btrfs_destroy_pinned_extent(struct btrfs_root *root, | |
3462 | struct extent_io_tree *pinned_extents) | |
3463 | { | |
3464 | struct extent_io_tree *unpin; | |
3465 | u64 start; | |
3466 | u64 end; | |
3467 | int ret; | |
3468 | ||
3469 | unpin = pinned_extents; | |
3470 | while (1) { | |
3471 | ret = find_first_extent_bit(unpin, 0, &start, &end, | |
3472 | EXTENT_DIRTY); | |
3473 | if (ret) | |
3474 | break; | |
3475 | ||
3476 | /* opt_discard */ | |
5378e607 LD |
3477 | if (btrfs_test_opt(root, DISCARD)) |
3478 | ret = btrfs_error_discard_extent(root, start, | |
3479 | end + 1 - start, | |
3480 | NULL); | |
acce952b | 3481 | |
3482 | clear_extent_dirty(unpin, start, end, GFP_NOFS); | |
3483 | btrfs_error_unpin_extent_range(root, start, end); | |
3484 | cond_resched(); | |
3485 | } | |
3486 | ||
3487 | return 0; | |
3488 | } | |
3489 | ||
3490 | static int btrfs_cleanup_transaction(struct btrfs_root *root) | |
3491 | { | |
3492 | struct btrfs_transaction *t; | |
3493 | LIST_HEAD(list); | |
3494 | ||
3495 | WARN_ON(1); | |
3496 | ||
acce952b | 3497 | mutex_lock(&root->fs_info->transaction_kthread_mutex); |
3498 | ||
a4abeea4 | 3499 | spin_lock(&root->fs_info->trans_lock); |
acce952b | 3500 | list_splice_init(&root->fs_info->trans_list, &list); |
a4abeea4 JB |
3501 | root->fs_info->trans_no_join = 1; |
3502 | spin_unlock(&root->fs_info->trans_lock); | |
3503 | ||
acce952b | 3504 | while (!list_empty(&list)) { |
3505 | t = list_entry(list.next, struct btrfs_transaction, list); | |
3506 | if (!t) | |
3507 | break; | |
3508 | ||
3509 | btrfs_destroy_ordered_operations(root); | |
3510 | ||
3511 | btrfs_destroy_ordered_extents(root); | |
3512 | ||
3513 | btrfs_destroy_delayed_refs(t, root); | |
3514 | ||
3515 | btrfs_block_rsv_release(root, | |
3516 | &root->fs_info->trans_block_rsv, | |
3517 | t->dirty_pages.dirty_bytes); | |
3518 | ||
3519 | /* FIXME: cleanup wait for commit */ | |
3520 | t->in_commit = 1; | |
3521 | t->blocked = 1; | |
3522 | if (waitqueue_active(&root->fs_info->transaction_blocked_wait)) | |
3523 | wake_up(&root->fs_info->transaction_blocked_wait); | |
3524 | ||
3525 | t->blocked = 0; | |
3526 | if (waitqueue_active(&root->fs_info->transaction_wait)) | |
3527 | wake_up(&root->fs_info->transaction_wait); | |
acce952b | 3528 | |
acce952b | 3529 | t->commit_done = 1; |
3530 | if (waitqueue_active(&t->commit_wait)) | |
3531 | wake_up(&t->commit_wait); | |
acce952b | 3532 | |
3533 | btrfs_destroy_pending_snapshots(t); | |
3534 | ||
3535 | btrfs_destroy_delalloc_inodes(root); | |
3536 | ||
a4abeea4 | 3537 | spin_lock(&root->fs_info->trans_lock); |
acce952b | 3538 | root->fs_info->running_transaction = NULL; |
a4abeea4 | 3539 | spin_unlock(&root->fs_info->trans_lock); |
acce952b | 3540 | |
3541 | btrfs_destroy_marked_extents(root, &t->dirty_pages, | |
3542 | EXTENT_DIRTY); | |
3543 | ||
3544 | btrfs_destroy_pinned_extent(root, | |
3545 | root->fs_info->pinned_extents); | |
3546 | ||
13c5a93e | 3547 | atomic_set(&t->use_count, 0); |
acce952b | 3548 | list_del_init(&t->list); |
3549 | memset(t, 0, sizeof(*t)); | |
3550 | kmem_cache_free(btrfs_transaction_cachep, t); | |
3551 | } | |
3552 | ||
a4abeea4 JB |
3553 | spin_lock(&root->fs_info->trans_lock); |
3554 | root->fs_info->trans_no_join = 0; | |
3555 | spin_unlock(&root->fs_info->trans_lock); | |
acce952b | 3556 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); |
acce952b | 3557 | |
3558 | return 0; | |
3559 | } | |
3560 | ||
d1310b2e | 3561 | static struct extent_io_ops btree_extent_io_ops = { |
4bef0848 | 3562 | .write_cache_pages_lock_hook = btree_lock_page_hook, |
ce9adaa5 | 3563 | .readpage_end_io_hook = btree_readpage_end_io_hook, |
4bb31e92 | 3564 | .readpage_io_failed_hook = btree_io_failed_hook, |
0b86a832 | 3565 | .submit_bio_hook = btree_submit_bio_hook, |
239b14b3 CM |
3566 | /* note we're sharing with inode.c for the merge bio hook */ |
3567 | .merge_bio_hook = btrfs_merge_bio_hook, | |
0da5468f | 3568 | }; |