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> |
4b4e25f2 | 31 | #include "compat.h" |
eb60ceac CM |
32 | #include "ctree.h" |
33 | #include "disk-io.h" | |
e089f05c | 34 | #include "transaction.h" |
0f7d52f4 | 35 | #include "btrfs_inode.h" |
0b86a832 | 36 | #include "volumes.h" |
db94535d | 37 | #include "print-tree.h" |
8b712842 | 38 | #include "async-thread.h" |
925baedd | 39 | #include "locking.h" |
e02119d5 | 40 | #include "tree-log.h" |
fa9c0d79 | 41 | #include "free-space-cache.h" |
eb60ceac | 42 | |
d1310b2e | 43 | static struct extent_io_ops btree_extent_io_ops; |
8b712842 | 44 | static void end_workqueue_fn(struct btrfs_work *work); |
4df27c4d | 45 | static void free_fs_root(struct btrfs_root *root); |
ce9adaa5 | 46 | |
ad081f14 JA |
47 | static atomic_t btrfs_bdi_num = ATOMIC_INIT(0); |
48 | ||
d352ac68 CM |
49 | /* |
50 | * end_io_wq structs are used to do processing in task context when an IO is | |
51 | * complete. This is used during reads to verify checksums, and it is used | |
52 | * by writes to insert metadata for new file extents after IO is complete. | |
53 | */ | |
ce9adaa5 CM |
54 | struct end_io_wq { |
55 | struct bio *bio; | |
56 | bio_end_io_t *end_io; | |
57 | void *private; | |
58 | struct btrfs_fs_info *info; | |
59 | int error; | |
22c59948 | 60 | int metadata; |
ce9adaa5 | 61 | struct list_head list; |
8b712842 | 62 | struct btrfs_work work; |
ce9adaa5 | 63 | }; |
0da5468f | 64 | |
d352ac68 CM |
65 | /* |
66 | * async submit bios are used to offload expensive checksumming | |
67 | * onto the worker threads. They checksum file and metadata bios | |
68 | * just before they are sent down the IO stack. | |
69 | */ | |
44b8bd7e CM |
70 | struct async_submit_bio { |
71 | struct inode *inode; | |
72 | struct bio *bio; | |
73 | struct list_head list; | |
4a69a410 CM |
74 | extent_submit_bio_hook_t *submit_bio_start; |
75 | extent_submit_bio_hook_t *submit_bio_done; | |
44b8bd7e CM |
76 | int rw; |
77 | int mirror_num; | |
c8b97818 | 78 | unsigned long bio_flags; |
8b712842 | 79 | struct btrfs_work work; |
44b8bd7e CM |
80 | }; |
81 | ||
4008c04a CM |
82 | /* These are used to set the lockdep class on the extent buffer locks. |
83 | * The class is set by the readpage_end_io_hook after the buffer has | |
84 | * passed csum validation but before the pages are unlocked. | |
85 | * | |
86 | * The lockdep class is also set by btrfs_init_new_buffer on freshly | |
87 | * allocated blocks. | |
88 | * | |
89 | * The class is based on the level in the tree block, which allows lockdep | |
90 | * to know that lower nodes nest inside the locks of higher nodes. | |
91 | * | |
92 | * We also add a check to make sure the highest level of the tree is | |
93 | * the same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this | |
94 | * code needs update as well. | |
95 | */ | |
96 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
97 | # if BTRFS_MAX_LEVEL != 8 | |
98 | # error | |
99 | # endif | |
100 | static struct lock_class_key btrfs_eb_class[BTRFS_MAX_LEVEL + 1]; | |
101 | static const char *btrfs_eb_name[BTRFS_MAX_LEVEL + 1] = { | |
102 | /* leaf */ | |
103 | "btrfs-extent-00", | |
104 | "btrfs-extent-01", | |
105 | "btrfs-extent-02", | |
106 | "btrfs-extent-03", | |
107 | "btrfs-extent-04", | |
108 | "btrfs-extent-05", | |
109 | "btrfs-extent-06", | |
110 | "btrfs-extent-07", | |
111 | /* highest possible level */ | |
112 | "btrfs-extent-08", | |
113 | }; | |
114 | #endif | |
115 | ||
d352ac68 CM |
116 | /* |
117 | * extents on the btree inode are pretty simple, there's one extent | |
118 | * that covers the entire device | |
119 | */ | |
b2950863 CH |
120 | static struct extent_map *btree_get_extent(struct inode *inode, |
121 | struct page *page, size_t page_offset, u64 start, u64 len, | |
122 | int create) | |
7eccb903 | 123 | { |
5f39d397 CM |
124 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
125 | struct extent_map *em; | |
126 | int ret; | |
127 | ||
890871be | 128 | read_lock(&em_tree->lock); |
d1310b2e | 129 | em = lookup_extent_mapping(em_tree, start, len); |
a061fc8d CM |
130 | if (em) { |
131 | em->bdev = | |
132 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; | |
890871be | 133 | read_unlock(&em_tree->lock); |
5f39d397 | 134 | goto out; |
a061fc8d | 135 | } |
890871be | 136 | read_unlock(&em_tree->lock); |
7b13b7b1 | 137 | |
5f39d397 CM |
138 | em = alloc_extent_map(GFP_NOFS); |
139 | if (!em) { | |
140 | em = ERR_PTR(-ENOMEM); | |
141 | goto out; | |
142 | } | |
143 | em->start = 0; | |
0afbaf8c | 144 | em->len = (u64)-1; |
c8b97818 | 145 | em->block_len = (u64)-1; |
5f39d397 | 146 | em->block_start = 0; |
a061fc8d | 147 | em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; |
d1310b2e | 148 | |
890871be | 149 | write_lock(&em_tree->lock); |
5f39d397 CM |
150 | ret = add_extent_mapping(em_tree, em); |
151 | if (ret == -EEXIST) { | |
0afbaf8c CM |
152 | u64 failed_start = em->start; |
153 | u64 failed_len = em->len; | |
154 | ||
5f39d397 | 155 | free_extent_map(em); |
7b13b7b1 | 156 | em = lookup_extent_mapping(em_tree, start, len); |
0afbaf8c | 157 | if (em) { |
7b13b7b1 | 158 | ret = 0; |
0afbaf8c CM |
159 | } else { |
160 | em = lookup_extent_mapping(em_tree, failed_start, | |
161 | failed_len); | |
7b13b7b1 | 162 | ret = -EIO; |
0afbaf8c | 163 | } |
5f39d397 | 164 | } else if (ret) { |
7b13b7b1 CM |
165 | free_extent_map(em); |
166 | em = NULL; | |
5f39d397 | 167 | } |
890871be | 168 | write_unlock(&em_tree->lock); |
7b13b7b1 CM |
169 | |
170 | if (ret) | |
171 | em = ERR_PTR(ret); | |
5f39d397 CM |
172 | out: |
173 | return em; | |
7eccb903 CM |
174 | } |
175 | ||
19c00ddc CM |
176 | u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len) |
177 | { | |
163e783e | 178 | return crc32c(seed, data, len); |
19c00ddc CM |
179 | } |
180 | ||
181 | void btrfs_csum_final(u32 crc, char *result) | |
182 | { | |
183 | *(__le32 *)result = ~cpu_to_le32(crc); | |
184 | } | |
185 | ||
d352ac68 CM |
186 | /* |
187 | * compute the csum for a btree block, and either verify it or write it | |
188 | * into the csum field of the block. | |
189 | */ | |
19c00ddc CM |
190 | static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, |
191 | int verify) | |
192 | { | |
607d432d JB |
193 | u16 csum_size = |
194 | btrfs_super_csum_size(&root->fs_info->super_copy); | |
195 | char *result = NULL; | |
19c00ddc CM |
196 | unsigned long len; |
197 | unsigned long cur_len; | |
198 | unsigned long offset = BTRFS_CSUM_SIZE; | |
199 | char *map_token = NULL; | |
200 | char *kaddr; | |
201 | unsigned long map_start; | |
202 | unsigned long map_len; | |
203 | int err; | |
204 | u32 crc = ~(u32)0; | |
607d432d | 205 | unsigned long inline_result; |
19c00ddc CM |
206 | |
207 | len = buf->len - offset; | |
d397712b | 208 | while (len > 0) { |
19c00ddc CM |
209 | err = map_private_extent_buffer(buf, offset, 32, |
210 | &map_token, &kaddr, | |
211 | &map_start, &map_len, KM_USER0); | |
d397712b | 212 | if (err) |
19c00ddc | 213 | return 1; |
19c00ddc CM |
214 | cur_len = min(len, map_len - (offset - map_start)); |
215 | crc = btrfs_csum_data(root, kaddr + offset - map_start, | |
216 | crc, cur_len); | |
217 | len -= cur_len; | |
218 | offset += cur_len; | |
219 | unmap_extent_buffer(buf, map_token, KM_USER0); | |
220 | } | |
607d432d JB |
221 | if (csum_size > sizeof(inline_result)) { |
222 | result = kzalloc(csum_size * sizeof(char), GFP_NOFS); | |
223 | if (!result) | |
224 | return 1; | |
225 | } else { | |
226 | result = (char *)&inline_result; | |
227 | } | |
228 | ||
19c00ddc CM |
229 | btrfs_csum_final(crc, result); |
230 | ||
231 | if (verify) { | |
607d432d | 232 | if (memcmp_extent_buffer(buf, result, 0, csum_size)) { |
e4204ded CM |
233 | u32 val; |
234 | u32 found = 0; | |
607d432d | 235 | memcpy(&found, result, csum_size); |
e4204ded | 236 | |
607d432d | 237 | read_extent_buffer(buf, &val, 0, csum_size); |
193f284d CM |
238 | if (printk_ratelimit()) { |
239 | printk(KERN_INFO "btrfs: %s checksum verify " | |
240 | "failed on %llu wanted %X found %X " | |
241 | "level %d\n", | |
242 | root->fs_info->sb->s_id, | |
243 | (unsigned long long)buf->start, val, found, | |
244 | btrfs_header_level(buf)); | |
245 | } | |
607d432d JB |
246 | if (result != (char *)&inline_result) |
247 | kfree(result); | |
19c00ddc CM |
248 | return 1; |
249 | } | |
250 | } else { | |
607d432d | 251 | write_extent_buffer(buf, result, 0, csum_size); |
19c00ddc | 252 | } |
607d432d JB |
253 | if (result != (char *)&inline_result) |
254 | kfree(result); | |
19c00ddc CM |
255 | return 0; |
256 | } | |
257 | ||
d352ac68 CM |
258 | /* |
259 | * we can't consider a given block up to date unless the transid of the | |
260 | * block matches the transid in the parent node's pointer. This is how we | |
261 | * detect blocks that either didn't get written at all or got written | |
262 | * in the wrong place. | |
263 | */ | |
1259ab75 CM |
264 | static int verify_parent_transid(struct extent_io_tree *io_tree, |
265 | struct extent_buffer *eb, u64 parent_transid) | |
266 | { | |
2ac55d41 | 267 | struct extent_state *cached_state = NULL; |
1259ab75 CM |
268 | int ret; |
269 | ||
270 | if (!parent_transid || btrfs_header_generation(eb) == parent_transid) | |
271 | return 0; | |
272 | ||
2ac55d41 JB |
273 | lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1, |
274 | 0, &cached_state, GFP_NOFS); | |
275 | if (extent_buffer_uptodate(io_tree, eb, cached_state) && | |
1259ab75 CM |
276 | btrfs_header_generation(eb) == parent_transid) { |
277 | ret = 0; | |
278 | goto out; | |
279 | } | |
193f284d CM |
280 | if (printk_ratelimit()) { |
281 | printk("parent transid verify failed on %llu wanted %llu " | |
282 | "found %llu\n", | |
283 | (unsigned long long)eb->start, | |
284 | (unsigned long long)parent_transid, | |
285 | (unsigned long long)btrfs_header_generation(eb)); | |
286 | } | |
1259ab75 | 287 | ret = 1; |
2ac55d41 | 288 | clear_extent_buffer_uptodate(io_tree, eb, &cached_state); |
33958dc6 | 289 | out: |
2ac55d41 JB |
290 | unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1, |
291 | &cached_state, GFP_NOFS); | |
1259ab75 | 292 | return ret; |
1259ab75 CM |
293 | } |
294 | ||
d352ac68 CM |
295 | /* |
296 | * helper to read a given tree block, doing retries as required when | |
297 | * the checksums don't match and we have alternate mirrors to try. | |
298 | */ | |
f188591e CM |
299 | static int btree_read_extent_buffer_pages(struct btrfs_root *root, |
300 | struct extent_buffer *eb, | |
ca7a79ad | 301 | u64 start, u64 parent_transid) |
f188591e CM |
302 | { |
303 | struct extent_io_tree *io_tree; | |
304 | int ret; | |
305 | int num_copies = 0; | |
306 | int mirror_num = 0; | |
307 | ||
308 | io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; | |
309 | while (1) { | |
310 | ret = read_extent_buffer_pages(io_tree, eb, start, 1, | |
311 | btree_get_extent, mirror_num); | |
1259ab75 CM |
312 | if (!ret && |
313 | !verify_parent_transid(io_tree, eb, parent_transid)) | |
f188591e | 314 | return ret; |
d397712b | 315 | |
f188591e CM |
316 | num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, |
317 | eb->start, eb->len); | |
4235298e | 318 | if (num_copies == 1) |
f188591e | 319 | return ret; |
4235298e | 320 | |
f188591e | 321 | mirror_num++; |
4235298e | 322 | if (mirror_num > num_copies) |
f188591e | 323 | return ret; |
f188591e | 324 | } |
f188591e CM |
325 | return -EIO; |
326 | } | |
19c00ddc | 327 | |
d352ac68 | 328 | /* |
d397712b CM |
329 | * checksum a dirty tree block before IO. This has extra checks to make sure |
330 | * we only fill in the checksum field in the first page of a multi-page block | |
d352ac68 | 331 | */ |
d397712b | 332 | |
b2950863 | 333 | static int csum_dirty_buffer(struct btrfs_root *root, struct page *page) |
19c00ddc | 334 | { |
d1310b2e | 335 | struct extent_io_tree *tree; |
35ebb934 | 336 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
19c00ddc CM |
337 | u64 found_start; |
338 | int found_level; | |
339 | unsigned long len; | |
340 | struct extent_buffer *eb; | |
f188591e CM |
341 | int ret; |
342 | ||
d1310b2e | 343 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
19c00ddc CM |
344 | |
345 | if (page->private == EXTENT_PAGE_PRIVATE) | |
346 | goto out; | |
347 | if (!page->private) | |
348 | goto out; | |
349 | len = page->private >> 2; | |
d397712b CM |
350 | WARN_ON(len == 0); |
351 | ||
19c00ddc | 352 | eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); |
ca7a79ad CM |
353 | ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE, |
354 | btrfs_header_generation(eb)); | |
f188591e | 355 | BUG_ON(ret); |
19c00ddc CM |
356 | found_start = btrfs_header_bytenr(eb); |
357 | if (found_start != start) { | |
55c69072 CM |
358 | WARN_ON(1); |
359 | goto err; | |
360 | } | |
361 | if (eb->first_page != page) { | |
55c69072 CM |
362 | WARN_ON(1); |
363 | goto err; | |
364 | } | |
365 | if (!PageUptodate(page)) { | |
55c69072 CM |
366 | WARN_ON(1); |
367 | goto err; | |
19c00ddc CM |
368 | } |
369 | found_level = btrfs_header_level(eb); | |
4bef0848 | 370 | |
19c00ddc | 371 | csum_tree_block(root, eb, 0); |
55c69072 | 372 | err: |
19c00ddc CM |
373 | free_extent_buffer(eb); |
374 | out: | |
375 | return 0; | |
376 | } | |
377 | ||
2b82032c YZ |
378 | static int check_tree_block_fsid(struct btrfs_root *root, |
379 | struct extent_buffer *eb) | |
380 | { | |
381 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
382 | u8 fsid[BTRFS_UUID_SIZE]; | |
383 | int ret = 1; | |
384 | ||
385 | read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb), | |
386 | BTRFS_FSID_SIZE); | |
387 | while (fs_devices) { | |
388 | if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) { | |
389 | ret = 0; | |
390 | break; | |
391 | } | |
392 | fs_devices = fs_devices->seed; | |
393 | } | |
394 | return ret; | |
395 | } | |
396 | ||
4008c04a CM |
397 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
398 | void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, int level) | |
399 | { | |
400 | lockdep_set_class_and_name(&eb->lock, | |
401 | &btrfs_eb_class[level], | |
402 | btrfs_eb_name[level]); | |
403 | } | |
404 | #endif | |
405 | ||
b2950863 | 406 | static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
ce9adaa5 CM |
407 | struct extent_state *state) |
408 | { | |
409 | struct extent_io_tree *tree; | |
410 | u64 found_start; | |
411 | int found_level; | |
412 | unsigned long len; | |
413 | struct extent_buffer *eb; | |
414 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
f188591e | 415 | int ret = 0; |
ce9adaa5 CM |
416 | |
417 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
418 | if (page->private == EXTENT_PAGE_PRIVATE) | |
419 | goto out; | |
420 | if (!page->private) | |
421 | goto out; | |
d397712b | 422 | |
ce9adaa5 | 423 | len = page->private >> 2; |
d397712b CM |
424 | WARN_ON(len == 0); |
425 | ||
ce9adaa5 | 426 | eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); |
f188591e | 427 | |
ce9adaa5 | 428 | found_start = btrfs_header_bytenr(eb); |
23a07867 | 429 | if (found_start != start) { |
193f284d CM |
430 | if (printk_ratelimit()) { |
431 | printk(KERN_INFO "btrfs bad tree block start " | |
432 | "%llu %llu\n", | |
433 | (unsigned long long)found_start, | |
434 | (unsigned long long)eb->start); | |
435 | } | |
f188591e | 436 | ret = -EIO; |
ce9adaa5 CM |
437 | goto err; |
438 | } | |
439 | if (eb->first_page != page) { | |
d397712b CM |
440 | printk(KERN_INFO "btrfs bad first page %lu %lu\n", |
441 | eb->first_page->index, page->index); | |
ce9adaa5 | 442 | WARN_ON(1); |
f188591e | 443 | ret = -EIO; |
ce9adaa5 CM |
444 | goto err; |
445 | } | |
2b82032c | 446 | if (check_tree_block_fsid(root, eb)) { |
193f284d CM |
447 | if (printk_ratelimit()) { |
448 | printk(KERN_INFO "btrfs bad fsid on block %llu\n", | |
449 | (unsigned long long)eb->start); | |
450 | } | |
1259ab75 CM |
451 | ret = -EIO; |
452 | goto err; | |
453 | } | |
ce9adaa5 CM |
454 | found_level = btrfs_header_level(eb); |
455 | ||
4008c04a CM |
456 | btrfs_set_buffer_lockdep_class(eb, found_level); |
457 | ||
ce9adaa5 | 458 | ret = csum_tree_block(root, eb, 1); |
f188591e CM |
459 | if (ret) |
460 | ret = -EIO; | |
ce9adaa5 CM |
461 | |
462 | end = min_t(u64, eb->len, PAGE_CACHE_SIZE); | |
463 | end = eb->start + end - 1; | |
ce9adaa5 CM |
464 | err: |
465 | free_extent_buffer(eb); | |
466 | out: | |
f188591e | 467 | return ret; |
ce9adaa5 CM |
468 | } |
469 | ||
ce9adaa5 | 470 | static void end_workqueue_bio(struct bio *bio, int err) |
ce9adaa5 CM |
471 | { |
472 | struct end_io_wq *end_io_wq = bio->bi_private; | |
473 | struct btrfs_fs_info *fs_info; | |
ce9adaa5 | 474 | |
ce9adaa5 | 475 | fs_info = end_io_wq->info; |
ce9adaa5 | 476 | end_io_wq->error = err; |
8b712842 CM |
477 | end_io_wq->work.func = end_workqueue_fn; |
478 | end_io_wq->work.flags = 0; | |
d20f7043 CM |
479 | |
480 | if (bio->bi_rw & (1 << BIO_RW)) { | |
cad321ad CM |
481 | if (end_io_wq->metadata) |
482 | btrfs_queue_worker(&fs_info->endio_meta_write_workers, | |
483 | &end_io_wq->work); | |
484 | else | |
485 | btrfs_queue_worker(&fs_info->endio_write_workers, | |
486 | &end_io_wq->work); | |
d20f7043 CM |
487 | } else { |
488 | if (end_io_wq->metadata) | |
489 | btrfs_queue_worker(&fs_info->endio_meta_workers, | |
490 | &end_io_wq->work); | |
491 | else | |
492 | btrfs_queue_worker(&fs_info->endio_workers, | |
493 | &end_io_wq->work); | |
494 | } | |
ce9adaa5 CM |
495 | } |
496 | ||
22c59948 CM |
497 | int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, |
498 | int metadata) | |
0b86a832 | 499 | { |
ce9adaa5 | 500 | struct end_io_wq *end_io_wq; |
ce9adaa5 CM |
501 | end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS); |
502 | if (!end_io_wq) | |
503 | return -ENOMEM; | |
504 | ||
505 | end_io_wq->private = bio->bi_private; | |
506 | end_io_wq->end_io = bio->bi_end_io; | |
22c59948 | 507 | end_io_wq->info = info; |
ce9adaa5 CM |
508 | end_io_wq->error = 0; |
509 | end_io_wq->bio = bio; | |
22c59948 | 510 | end_io_wq->metadata = metadata; |
ce9adaa5 CM |
511 | |
512 | bio->bi_private = end_io_wq; | |
513 | bio->bi_end_io = end_workqueue_bio; | |
22c59948 CM |
514 | return 0; |
515 | } | |
516 | ||
b64a2851 | 517 | unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info) |
0986fe9e | 518 | { |
4854ddd0 CM |
519 | unsigned long limit = min_t(unsigned long, |
520 | info->workers.max_workers, | |
521 | info->fs_devices->open_devices); | |
522 | return 256 * limit; | |
523 | } | |
0986fe9e | 524 | |
4854ddd0 CM |
525 | int btrfs_congested_async(struct btrfs_fs_info *info, int iodone) |
526 | { | |
b64a2851 CM |
527 | return atomic_read(&info->nr_async_bios) > |
528 | btrfs_async_submit_limit(info); | |
0986fe9e CM |
529 | } |
530 | ||
4a69a410 CM |
531 | static void run_one_async_start(struct btrfs_work *work) |
532 | { | |
533 | struct btrfs_fs_info *fs_info; | |
534 | struct async_submit_bio *async; | |
535 | ||
536 | async = container_of(work, struct async_submit_bio, work); | |
537 | fs_info = BTRFS_I(async->inode)->root->fs_info; | |
538 | async->submit_bio_start(async->inode, async->rw, async->bio, | |
539 | async->mirror_num, async->bio_flags); | |
540 | } | |
541 | ||
542 | static void run_one_async_done(struct btrfs_work *work) | |
8b712842 CM |
543 | { |
544 | struct btrfs_fs_info *fs_info; | |
545 | struct async_submit_bio *async; | |
4854ddd0 | 546 | int limit; |
8b712842 CM |
547 | |
548 | async = container_of(work, struct async_submit_bio, work); | |
549 | fs_info = BTRFS_I(async->inode)->root->fs_info; | |
4854ddd0 | 550 | |
b64a2851 | 551 | limit = btrfs_async_submit_limit(fs_info); |
4854ddd0 CM |
552 | limit = limit * 2 / 3; |
553 | ||
8b712842 | 554 | atomic_dec(&fs_info->nr_async_submits); |
0986fe9e | 555 | |
b64a2851 CM |
556 | if (atomic_read(&fs_info->nr_async_submits) < limit && |
557 | waitqueue_active(&fs_info->async_submit_wait)) | |
4854ddd0 CM |
558 | wake_up(&fs_info->async_submit_wait); |
559 | ||
4a69a410 | 560 | async->submit_bio_done(async->inode, async->rw, async->bio, |
c8b97818 | 561 | async->mirror_num, async->bio_flags); |
4a69a410 CM |
562 | } |
563 | ||
564 | static void run_one_async_free(struct btrfs_work *work) | |
565 | { | |
566 | struct async_submit_bio *async; | |
567 | ||
568 | async = container_of(work, struct async_submit_bio, work); | |
8b712842 CM |
569 | kfree(async); |
570 | } | |
571 | ||
44b8bd7e CM |
572 | int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, |
573 | int rw, struct bio *bio, int mirror_num, | |
c8b97818 | 574 | unsigned long bio_flags, |
4a69a410 CM |
575 | extent_submit_bio_hook_t *submit_bio_start, |
576 | extent_submit_bio_hook_t *submit_bio_done) | |
44b8bd7e CM |
577 | { |
578 | struct async_submit_bio *async; | |
579 | ||
580 | async = kmalloc(sizeof(*async), GFP_NOFS); | |
581 | if (!async) | |
582 | return -ENOMEM; | |
583 | ||
584 | async->inode = inode; | |
585 | async->rw = rw; | |
586 | async->bio = bio; | |
587 | async->mirror_num = mirror_num; | |
4a69a410 CM |
588 | async->submit_bio_start = submit_bio_start; |
589 | async->submit_bio_done = submit_bio_done; | |
590 | ||
591 | async->work.func = run_one_async_start; | |
592 | async->work.ordered_func = run_one_async_done; | |
593 | async->work.ordered_free = run_one_async_free; | |
594 | ||
8b712842 | 595 | async->work.flags = 0; |
c8b97818 | 596 | async->bio_flags = bio_flags; |
8c8bee1d | 597 | |
cb03c743 | 598 | atomic_inc(&fs_info->nr_async_submits); |
d313d7a3 CM |
599 | |
600 | if (rw & (1 << BIO_RW_SYNCIO)) | |
601 | btrfs_set_work_high_prio(&async->work); | |
602 | ||
8b712842 | 603 | btrfs_queue_worker(&fs_info->workers, &async->work); |
9473f16c | 604 | |
d397712b | 605 | while (atomic_read(&fs_info->async_submit_draining) && |
771ed689 CM |
606 | atomic_read(&fs_info->nr_async_submits)) { |
607 | wait_event(fs_info->async_submit_wait, | |
608 | (atomic_read(&fs_info->nr_async_submits) == 0)); | |
609 | } | |
610 | ||
44b8bd7e CM |
611 | return 0; |
612 | } | |
613 | ||
ce3ed71a CM |
614 | static int btree_csum_one_bio(struct bio *bio) |
615 | { | |
616 | struct bio_vec *bvec = bio->bi_io_vec; | |
617 | int bio_index = 0; | |
618 | struct btrfs_root *root; | |
619 | ||
620 | WARN_ON(bio->bi_vcnt <= 0); | |
d397712b | 621 | while (bio_index < bio->bi_vcnt) { |
ce3ed71a CM |
622 | root = BTRFS_I(bvec->bv_page->mapping->host)->root; |
623 | csum_dirty_buffer(root, bvec->bv_page); | |
624 | bio_index++; | |
625 | bvec++; | |
626 | } | |
627 | return 0; | |
628 | } | |
629 | ||
4a69a410 CM |
630 | static int __btree_submit_bio_start(struct inode *inode, int rw, |
631 | struct bio *bio, int mirror_num, | |
632 | unsigned long bio_flags) | |
22c59948 | 633 | { |
8b712842 CM |
634 | /* |
635 | * when we're called for a write, we're already in the async | |
5443be45 | 636 | * submission context. Just jump into btrfs_map_bio |
8b712842 | 637 | */ |
4a69a410 CM |
638 | btree_csum_one_bio(bio); |
639 | return 0; | |
640 | } | |
22c59948 | 641 | |
4a69a410 CM |
642 | static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio, |
643 | int mirror_num, unsigned long bio_flags) | |
644 | { | |
8b712842 | 645 | /* |
4a69a410 CM |
646 | * when we're called for a write, we're already in the async |
647 | * submission context. Just jump into btrfs_map_bio | |
8b712842 | 648 | */ |
8b712842 | 649 | return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1); |
0b86a832 CM |
650 | } |
651 | ||
44b8bd7e | 652 | static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
c8b97818 | 653 | int mirror_num, unsigned long bio_flags) |
44b8bd7e | 654 | { |
cad321ad CM |
655 | int ret; |
656 | ||
657 | ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info, | |
658 | bio, 1); | |
659 | BUG_ON(ret); | |
660 | ||
44b8bd7e | 661 | if (!(rw & (1 << BIO_RW))) { |
4a69a410 CM |
662 | /* |
663 | * called for a read, do the setup so that checksum validation | |
664 | * can happen in the async kernel threads | |
665 | */ | |
4a69a410 | 666 | return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, |
6f3577bd | 667 | mirror_num, 0); |
44b8bd7e | 668 | } |
d313d7a3 | 669 | |
cad321ad CM |
670 | /* |
671 | * kthread helpers are used to submit writes so that checksumming | |
672 | * can happen in parallel across all CPUs | |
673 | */ | |
44b8bd7e | 674 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
c8b97818 | 675 | inode, rw, bio, mirror_num, 0, |
4a69a410 CM |
676 | __btree_submit_bio_start, |
677 | __btree_submit_bio_done); | |
44b8bd7e CM |
678 | } |
679 | ||
0da5468f CM |
680 | static int btree_writepage(struct page *page, struct writeback_control *wbc) |
681 | { | |
d1310b2e | 682 | struct extent_io_tree *tree; |
b9473439 CM |
683 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; |
684 | struct extent_buffer *eb; | |
685 | int was_dirty; | |
686 | ||
d1310b2e | 687 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
b9473439 CM |
688 | if (!(current->flags & PF_MEMALLOC)) { |
689 | return extent_write_full_page(tree, page, | |
690 | btree_get_extent, wbc); | |
691 | } | |
5443be45 | 692 | |
b9473439 CM |
693 | redirty_page_for_writepage(wbc, page); |
694 | eb = btrfs_find_tree_block(root, page_offset(page), | |
695 | PAGE_CACHE_SIZE); | |
696 | WARN_ON(!eb); | |
697 | ||
698 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); | |
699 | if (!was_dirty) { | |
700 | spin_lock(&root->fs_info->delalloc_lock); | |
701 | root->fs_info->dirty_metadata_bytes += PAGE_CACHE_SIZE; | |
702 | spin_unlock(&root->fs_info->delalloc_lock); | |
5443be45 | 703 | } |
b9473439 CM |
704 | free_extent_buffer(eb); |
705 | ||
706 | unlock_page(page); | |
707 | return 0; | |
5f39d397 | 708 | } |
0da5468f CM |
709 | |
710 | static int btree_writepages(struct address_space *mapping, | |
711 | struct writeback_control *wbc) | |
712 | { | |
d1310b2e CM |
713 | struct extent_io_tree *tree; |
714 | tree = &BTRFS_I(mapping->host)->io_tree; | |
d8d5f3e1 | 715 | if (wbc->sync_mode == WB_SYNC_NONE) { |
b9473439 | 716 | struct btrfs_root *root = BTRFS_I(mapping->host)->root; |
793955bc | 717 | u64 num_dirty; |
24ab9cd8 | 718 | unsigned long thresh = 32 * 1024 * 1024; |
448d640b CM |
719 | |
720 | if (wbc->for_kupdate) | |
721 | return 0; | |
722 | ||
b9473439 CM |
723 | /* this is a bit racy, but that's ok */ |
724 | num_dirty = root->fs_info->dirty_metadata_bytes; | |
d397712b | 725 | if (num_dirty < thresh) |
793955bc | 726 | return 0; |
793955bc | 727 | } |
0da5468f CM |
728 | return extent_writepages(tree, mapping, btree_get_extent, wbc); |
729 | } | |
730 | ||
b2950863 | 731 | static int btree_readpage(struct file *file, struct page *page) |
5f39d397 | 732 | { |
d1310b2e CM |
733 | struct extent_io_tree *tree; |
734 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
5f39d397 CM |
735 | return extent_read_full_page(tree, page, btree_get_extent); |
736 | } | |
22b0ebda | 737 | |
70dec807 | 738 | static int btree_releasepage(struct page *page, gfp_t gfp_flags) |
5f39d397 | 739 | { |
d1310b2e CM |
740 | struct extent_io_tree *tree; |
741 | struct extent_map_tree *map; | |
5f39d397 | 742 | int ret; |
d98237b3 | 743 | |
98509cfc | 744 | if (PageWriteback(page) || PageDirty(page)) |
d397712b | 745 | return 0; |
98509cfc | 746 | |
d1310b2e CM |
747 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
748 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
6af118ce | 749 | |
7b13b7b1 | 750 | ret = try_release_extent_state(map, tree, page, gfp_flags); |
d397712b | 751 | if (!ret) |
6af118ce | 752 | return 0; |
6af118ce CM |
753 | |
754 | ret = try_release_extent_buffer(tree, page); | |
5f39d397 CM |
755 | if (ret == 1) { |
756 | ClearPagePrivate(page); | |
757 | set_page_private(page, 0); | |
758 | page_cache_release(page); | |
759 | } | |
6af118ce | 760 | |
d98237b3 CM |
761 | return ret; |
762 | } | |
763 | ||
5f39d397 | 764 | static void btree_invalidatepage(struct page *page, unsigned long offset) |
d98237b3 | 765 | { |
d1310b2e CM |
766 | struct extent_io_tree *tree; |
767 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
5f39d397 CM |
768 | extent_invalidatepage(tree, page, offset); |
769 | btree_releasepage(page, GFP_NOFS); | |
9ad6b7bc | 770 | if (PagePrivate(page)) { |
d397712b CM |
771 | printk(KERN_WARNING "btrfs warning page private not zero " |
772 | "on page %llu\n", (unsigned long long)page_offset(page)); | |
9ad6b7bc CM |
773 | ClearPagePrivate(page); |
774 | set_page_private(page, 0); | |
775 | page_cache_release(page); | |
776 | } | |
d98237b3 CM |
777 | } |
778 | ||
7f09410b | 779 | static const struct address_space_operations btree_aops = { |
d98237b3 CM |
780 | .readpage = btree_readpage, |
781 | .writepage = btree_writepage, | |
0da5468f | 782 | .writepages = btree_writepages, |
5f39d397 CM |
783 | .releasepage = btree_releasepage, |
784 | .invalidatepage = btree_invalidatepage, | |
d98237b3 CM |
785 | .sync_page = block_sync_page, |
786 | }; | |
787 | ||
ca7a79ad CM |
788 | int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, |
789 | u64 parent_transid) | |
090d1875 | 790 | { |
5f39d397 CM |
791 | struct extent_buffer *buf = NULL; |
792 | struct inode *btree_inode = root->fs_info->btree_inode; | |
de428b63 | 793 | int ret = 0; |
090d1875 | 794 | |
db94535d | 795 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
5f39d397 | 796 | if (!buf) |
090d1875 | 797 | return 0; |
d1310b2e | 798 | read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, |
f188591e | 799 | buf, 0, 0, btree_get_extent, 0); |
5f39d397 | 800 | free_extent_buffer(buf); |
de428b63 | 801 | return ret; |
090d1875 CM |
802 | } |
803 | ||
0999df54 CM |
804 | struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, |
805 | u64 bytenr, u32 blocksize) | |
806 | { | |
807 | struct inode *btree_inode = root->fs_info->btree_inode; | |
808 | struct extent_buffer *eb; | |
809 | eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, | |
810 | bytenr, blocksize, GFP_NOFS); | |
811 | return eb; | |
812 | } | |
813 | ||
814 | struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, | |
815 | u64 bytenr, u32 blocksize) | |
816 | { | |
817 | struct inode *btree_inode = root->fs_info->btree_inode; | |
818 | struct extent_buffer *eb; | |
819 | ||
820 | eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree, | |
821 | bytenr, blocksize, NULL, GFP_NOFS); | |
822 | return eb; | |
823 | } | |
824 | ||
825 | ||
e02119d5 CM |
826 | int btrfs_write_tree_block(struct extent_buffer *buf) |
827 | { | |
8aa38c31 CH |
828 | return filemap_fdatawrite_range(buf->first_page->mapping, buf->start, |
829 | buf->start + buf->len - 1); | |
e02119d5 CM |
830 | } |
831 | ||
832 | int btrfs_wait_tree_block_writeback(struct extent_buffer *buf) | |
833 | { | |
8aa38c31 CH |
834 | return filemap_fdatawait_range(buf->first_page->mapping, |
835 | buf->start, buf->start + buf->len - 1); | |
e02119d5 CM |
836 | } |
837 | ||
0999df54 | 838 | struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, |
ca7a79ad | 839 | u32 blocksize, u64 parent_transid) |
0999df54 CM |
840 | { |
841 | struct extent_buffer *buf = NULL; | |
842 | struct inode *btree_inode = root->fs_info->btree_inode; | |
843 | struct extent_io_tree *io_tree; | |
844 | int ret; | |
845 | ||
846 | io_tree = &BTRFS_I(btree_inode)->io_tree; | |
847 | ||
848 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
849 | if (!buf) | |
850 | return NULL; | |
0999df54 | 851 | |
ca7a79ad | 852 | ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); |
ce9adaa5 | 853 | |
d397712b | 854 | if (ret == 0) |
b4ce94de | 855 | set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); |
5f39d397 | 856 | return buf; |
ce9adaa5 | 857 | |
eb60ceac CM |
858 | } |
859 | ||
e089f05c | 860 | int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
5f39d397 | 861 | struct extent_buffer *buf) |
ed2ff2cb | 862 | { |
5f39d397 | 863 | struct inode *btree_inode = root->fs_info->btree_inode; |
55c69072 | 864 | if (btrfs_header_generation(buf) == |
925baedd | 865 | root->fs_info->running_transaction->transid) { |
b9447ef8 | 866 | btrfs_assert_tree_locked(buf); |
b4ce94de | 867 | |
b9473439 CM |
868 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) { |
869 | spin_lock(&root->fs_info->delalloc_lock); | |
870 | if (root->fs_info->dirty_metadata_bytes >= buf->len) | |
871 | root->fs_info->dirty_metadata_bytes -= buf->len; | |
872 | else | |
873 | WARN_ON(1); | |
874 | spin_unlock(&root->fs_info->delalloc_lock); | |
875 | } | |
b4ce94de | 876 | |
b9473439 CM |
877 | /* ugh, clear_extent_buffer_dirty needs to lock the page */ |
878 | btrfs_set_lock_blocking(buf); | |
d1310b2e | 879 | clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, |
55c69072 | 880 | buf); |
925baedd | 881 | } |
5f39d397 CM |
882 | return 0; |
883 | } | |
884 | ||
db94535d | 885 | static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, |
87ee04eb | 886 | u32 stripesize, struct btrfs_root *root, |
9f5fae2f | 887 | struct btrfs_fs_info *fs_info, |
e20d96d6 | 888 | u64 objectid) |
d97e63b6 | 889 | { |
cfaa7295 | 890 | root->node = NULL; |
a28ec197 | 891 | root->commit_root = NULL; |
db94535d CM |
892 | root->sectorsize = sectorsize; |
893 | root->nodesize = nodesize; | |
894 | root->leafsize = leafsize; | |
87ee04eb | 895 | root->stripesize = stripesize; |
123abc88 | 896 | root->ref_cows = 0; |
0b86a832 | 897 | root->track_dirty = 0; |
c71bf099 YZ |
898 | root->in_radix = 0; |
899 | root->clean_orphans = 0; | |
0b86a832 | 900 | |
9f5fae2f | 901 | root->fs_info = fs_info; |
0f7d52f4 CM |
902 | root->objectid = objectid; |
903 | root->last_trans = 0; | |
13a8a7c8 | 904 | root->highest_objectid = 0; |
58176a96 | 905 | root->name = NULL; |
4313b399 | 906 | root->in_sysfs = 0; |
6bef4d31 | 907 | root->inode_tree = RB_ROOT; |
0b86a832 CM |
908 | |
909 | INIT_LIST_HEAD(&root->dirty_list); | |
7b128766 | 910 | INIT_LIST_HEAD(&root->orphan_list); |
5d4f98a2 | 911 | INIT_LIST_HEAD(&root->root_list); |
925baedd | 912 | spin_lock_init(&root->node_lock); |
bcc63abb | 913 | spin_lock_init(&root->list_lock); |
5d4f98a2 | 914 | spin_lock_init(&root->inode_lock); |
a2135011 | 915 | mutex_init(&root->objectid_mutex); |
e02119d5 | 916 | mutex_init(&root->log_mutex); |
7237f183 YZ |
917 | init_waitqueue_head(&root->log_writer_wait); |
918 | init_waitqueue_head(&root->log_commit_wait[0]); | |
919 | init_waitqueue_head(&root->log_commit_wait[1]); | |
920 | atomic_set(&root->log_commit[0], 0); | |
921 | atomic_set(&root->log_commit[1], 0); | |
922 | atomic_set(&root->log_writers, 0); | |
923 | root->log_batch = 0; | |
924 | root->log_transid = 0; | |
257c62e1 | 925 | root->last_log_commit = 0; |
d0c803c4 CM |
926 | extent_io_tree_init(&root->dirty_log_pages, |
927 | fs_info->btree_inode->i_mapping, GFP_NOFS); | |
017e5369 | 928 | |
3768f368 CM |
929 | memset(&root->root_key, 0, sizeof(root->root_key)); |
930 | memset(&root->root_item, 0, sizeof(root->root_item)); | |
6702ed49 | 931 | memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); |
58176a96 | 932 | memset(&root->root_kobj, 0, sizeof(root->root_kobj)); |
3f157a2f | 933 | root->defrag_trans_start = fs_info->generation; |
58176a96 | 934 | init_completion(&root->kobj_unregister); |
6702ed49 | 935 | root->defrag_running = 0; |
4d775673 | 936 | root->root_key.objectid = objectid; |
3394e160 CM |
937 | root->anon_super.s_root = NULL; |
938 | root->anon_super.s_dev = 0; | |
939 | INIT_LIST_HEAD(&root->anon_super.s_list); | |
940 | INIT_LIST_HEAD(&root->anon_super.s_instances); | |
941 | init_rwsem(&root->anon_super.s_umount); | |
942 | ||
3768f368 CM |
943 | return 0; |
944 | } | |
945 | ||
db94535d | 946 | static int find_and_setup_root(struct btrfs_root *tree_root, |
9f5fae2f CM |
947 | struct btrfs_fs_info *fs_info, |
948 | u64 objectid, | |
e20d96d6 | 949 | struct btrfs_root *root) |
3768f368 CM |
950 | { |
951 | int ret; | |
db94535d | 952 | u32 blocksize; |
84234f3a | 953 | u64 generation; |
3768f368 | 954 | |
db94535d | 955 | __setup_root(tree_root->nodesize, tree_root->leafsize, |
87ee04eb CM |
956 | tree_root->sectorsize, tree_root->stripesize, |
957 | root, fs_info, objectid); | |
3768f368 CM |
958 | ret = btrfs_find_last_root(tree_root, objectid, |
959 | &root->root_item, &root->root_key); | |
4df27c4d YZ |
960 | if (ret > 0) |
961 | return -ENOENT; | |
3768f368 CM |
962 | BUG_ON(ret); |
963 | ||
84234f3a | 964 | generation = btrfs_root_generation(&root->root_item); |
db94535d CM |
965 | blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); |
966 | root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), | |
84234f3a | 967 | blocksize, generation); |
3768f368 | 968 | BUG_ON(!root->node); |
4df27c4d | 969 | root->commit_root = btrfs_root_node(root); |
d97e63b6 CM |
970 | return 0; |
971 | } | |
972 | ||
e02119d5 CM |
973 | int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, |
974 | struct btrfs_fs_info *fs_info) | |
975 | { | |
976 | struct extent_buffer *eb; | |
d0c803c4 CM |
977 | struct btrfs_root *log_root_tree = fs_info->log_root_tree; |
978 | u64 start = 0; | |
979 | u64 end = 0; | |
e02119d5 CM |
980 | int ret; |
981 | ||
d0c803c4 | 982 | if (!log_root_tree) |
e02119d5 CM |
983 | return 0; |
984 | ||
d397712b | 985 | while (1) { |
d0c803c4 | 986 | ret = find_first_extent_bit(&log_root_tree->dirty_log_pages, |
8cef4e16 | 987 | 0, &start, &end, EXTENT_DIRTY | EXTENT_NEW); |
d0c803c4 CM |
988 | if (ret) |
989 | break; | |
990 | ||
8cef4e16 YZ |
991 | clear_extent_bits(&log_root_tree->dirty_log_pages, start, end, |
992 | EXTENT_DIRTY | EXTENT_NEW, GFP_NOFS); | |
d0c803c4 | 993 | } |
e02119d5 CM |
994 | eb = fs_info->log_root_tree->node; |
995 | ||
996 | WARN_ON(btrfs_header_level(eb) != 0); | |
997 | WARN_ON(btrfs_header_nritems(eb) != 0); | |
998 | ||
d00aff00 CM |
999 | ret = btrfs_free_reserved_extent(fs_info->tree_root, |
1000 | eb->start, eb->len); | |
e02119d5 CM |
1001 | BUG_ON(ret); |
1002 | ||
1003 | free_extent_buffer(eb); | |
1004 | kfree(fs_info->log_root_tree); | |
1005 | fs_info->log_root_tree = NULL; | |
1006 | return 0; | |
1007 | } | |
1008 | ||
7237f183 YZ |
1009 | static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans, |
1010 | struct btrfs_fs_info *fs_info) | |
0f7d52f4 CM |
1011 | { |
1012 | struct btrfs_root *root; | |
1013 | struct btrfs_root *tree_root = fs_info->tree_root; | |
7237f183 | 1014 | struct extent_buffer *leaf; |
e02119d5 CM |
1015 | |
1016 | root = kzalloc(sizeof(*root), GFP_NOFS); | |
1017 | if (!root) | |
7237f183 | 1018 | return ERR_PTR(-ENOMEM); |
e02119d5 CM |
1019 | |
1020 | __setup_root(tree_root->nodesize, tree_root->leafsize, | |
1021 | tree_root->sectorsize, tree_root->stripesize, | |
1022 | root, fs_info, BTRFS_TREE_LOG_OBJECTID); | |
1023 | ||
1024 | root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; | |
1025 | root->root_key.type = BTRFS_ROOT_ITEM_KEY; | |
1026 | root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; | |
7237f183 YZ |
1027 | /* |
1028 | * log trees do not get reference counted because they go away | |
1029 | * before a real commit is actually done. They do store pointers | |
1030 | * to file data extents, and those reference counts still get | |
1031 | * updated (along with back refs to the log tree). | |
1032 | */ | |
e02119d5 CM |
1033 | root->ref_cows = 0; |
1034 | ||
5d4f98a2 YZ |
1035 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, |
1036 | BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0); | |
7237f183 YZ |
1037 | if (IS_ERR(leaf)) { |
1038 | kfree(root); | |
1039 | return ERR_CAST(leaf); | |
1040 | } | |
e02119d5 | 1041 | |
5d4f98a2 YZ |
1042 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
1043 | btrfs_set_header_bytenr(leaf, leaf->start); | |
1044 | btrfs_set_header_generation(leaf, trans->transid); | |
1045 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); | |
1046 | btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID); | |
7237f183 | 1047 | root->node = leaf; |
e02119d5 CM |
1048 | |
1049 | write_extent_buffer(root->node, root->fs_info->fsid, | |
1050 | (unsigned long)btrfs_header_fsid(root->node), | |
1051 | BTRFS_FSID_SIZE); | |
1052 | btrfs_mark_buffer_dirty(root->node); | |
1053 | btrfs_tree_unlock(root->node); | |
7237f183 YZ |
1054 | return root; |
1055 | } | |
1056 | ||
1057 | int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, | |
1058 | struct btrfs_fs_info *fs_info) | |
1059 | { | |
1060 | struct btrfs_root *log_root; | |
1061 | ||
1062 | log_root = alloc_log_tree(trans, fs_info); | |
1063 | if (IS_ERR(log_root)) | |
1064 | return PTR_ERR(log_root); | |
1065 | WARN_ON(fs_info->log_root_tree); | |
1066 | fs_info->log_root_tree = log_root; | |
1067 | return 0; | |
1068 | } | |
1069 | ||
1070 | int btrfs_add_log_tree(struct btrfs_trans_handle *trans, | |
1071 | struct btrfs_root *root) | |
1072 | { | |
1073 | struct btrfs_root *log_root; | |
1074 | struct btrfs_inode_item *inode_item; | |
1075 | ||
1076 | log_root = alloc_log_tree(trans, root->fs_info); | |
1077 | if (IS_ERR(log_root)) | |
1078 | return PTR_ERR(log_root); | |
1079 | ||
1080 | log_root->last_trans = trans->transid; | |
1081 | log_root->root_key.offset = root->root_key.objectid; | |
1082 | ||
1083 | inode_item = &log_root->root_item.inode; | |
1084 | inode_item->generation = cpu_to_le64(1); | |
1085 | inode_item->size = cpu_to_le64(3); | |
1086 | inode_item->nlink = cpu_to_le32(1); | |
1087 | inode_item->nbytes = cpu_to_le64(root->leafsize); | |
1088 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
1089 | ||
5d4f98a2 | 1090 | btrfs_set_root_node(&log_root->root_item, log_root->node); |
7237f183 YZ |
1091 | |
1092 | WARN_ON(root->log_root); | |
1093 | root->log_root = log_root; | |
1094 | root->log_transid = 0; | |
257c62e1 | 1095 | root->last_log_commit = 0; |
e02119d5 CM |
1096 | return 0; |
1097 | } | |
1098 | ||
1099 | struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root, | |
1100 | struct btrfs_key *location) | |
1101 | { | |
1102 | struct btrfs_root *root; | |
1103 | struct btrfs_fs_info *fs_info = tree_root->fs_info; | |
0f7d52f4 | 1104 | struct btrfs_path *path; |
5f39d397 | 1105 | struct extent_buffer *l; |
84234f3a | 1106 | u64 generation; |
db94535d | 1107 | u32 blocksize; |
0f7d52f4 CM |
1108 | int ret = 0; |
1109 | ||
5eda7b5e | 1110 | root = kzalloc(sizeof(*root), GFP_NOFS); |
0cf6c620 | 1111 | if (!root) |
0f7d52f4 | 1112 | return ERR_PTR(-ENOMEM); |
0f7d52f4 | 1113 | if (location->offset == (u64)-1) { |
db94535d | 1114 | ret = find_and_setup_root(tree_root, fs_info, |
0f7d52f4 CM |
1115 | location->objectid, root); |
1116 | if (ret) { | |
0f7d52f4 CM |
1117 | kfree(root); |
1118 | return ERR_PTR(ret); | |
1119 | } | |
13a8a7c8 | 1120 | goto out; |
0f7d52f4 CM |
1121 | } |
1122 | ||
db94535d | 1123 | __setup_root(tree_root->nodesize, tree_root->leafsize, |
87ee04eb CM |
1124 | tree_root->sectorsize, tree_root->stripesize, |
1125 | root, fs_info, location->objectid); | |
0f7d52f4 CM |
1126 | |
1127 | path = btrfs_alloc_path(); | |
1128 | BUG_ON(!path); | |
1129 | ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); | |
13a8a7c8 YZ |
1130 | if (ret == 0) { |
1131 | l = path->nodes[0]; | |
1132 | read_extent_buffer(l, &root->root_item, | |
1133 | btrfs_item_ptr_offset(l, path->slots[0]), | |
1134 | sizeof(root->root_item)); | |
1135 | memcpy(&root->root_key, location, sizeof(*location)); | |
0f7d52f4 | 1136 | } |
0f7d52f4 CM |
1137 | btrfs_free_path(path); |
1138 | if (ret) { | |
13a8a7c8 YZ |
1139 | if (ret > 0) |
1140 | ret = -ENOENT; | |
0f7d52f4 CM |
1141 | return ERR_PTR(ret); |
1142 | } | |
13a8a7c8 | 1143 | |
84234f3a | 1144 | generation = btrfs_root_generation(&root->root_item); |
db94535d CM |
1145 | blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); |
1146 | root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), | |
84234f3a | 1147 | blocksize, generation); |
5d4f98a2 | 1148 | root->commit_root = btrfs_root_node(root); |
0f7d52f4 | 1149 | BUG_ON(!root->node); |
13a8a7c8 YZ |
1150 | out: |
1151 | if (location->objectid != BTRFS_TREE_LOG_OBJECTID) | |
e02119d5 | 1152 | root->ref_cows = 1; |
13a8a7c8 | 1153 | |
5eda7b5e CM |
1154 | return root; |
1155 | } | |
1156 | ||
dc17ff8f CM |
1157 | struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, |
1158 | u64 root_objectid) | |
1159 | { | |
1160 | struct btrfs_root *root; | |
1161 | ||
1162 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1163 | return fs_info->tree_root; | |
1164 | if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID) | |
1165 | return fs_info->extent_root; | |
1166 | ||
1167 | root = radix_tree_lookup(&fs_info->fs_roots_radix, | |
1168 | (unsigned long)root_objectid); | |
1169 | return root; | |
1170 | } | |
1171 | ||
edbd8d4e CM |
1172 | struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, |
1173 | struct btrfs_key *location) | |
5eda7b5e CM |
1174 | { |
1175 | struct btrfs_root *root; | |
1176 | int ret; | |
1177 | ||
edbd8d4e CM |
1178 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) |
1179 | return fs_info->tree_root; | |
1180 | if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) | |
1181 | return fs_info->extent_root; | |
8f18cf13 CM |
1182 | if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) |
1183 | return fs_info->chunk_root; | |
1184 | if (location->objectid == BTRFS_DEV_TREE_OBJECTID) | |
1185 | return fs_info->dev_root; | |
0403e47e YZ |
1186 | if (location->objectid == BTRFS_CSUM_TREE_OBJECTID) |
1187 | return fs_info->csum_root; | |
4df27c4d YZ |
1188 | again: |
1189 | spin_lock(&fs_info->fs_roots_radix_lock); | |
5eda7b5e CM |
1190 | root = radix_tree_lookup(&fs_info->fs_roots_radix, |
1191 | (unsigned long)location->objectid); | |
4df27c4d | 1192 | spin_unlock(&fs_info->fs_roots_radix_lock); |
5eda7b5e CM |
1193 | if (root) |
1194 | return root; | |
1195 | ||
4df27c4d YZ |
1196 | ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid); |
1197 | if (ret == 0) | |
1198 | ret = -ENOENT; | |
1199 | if (ret < 0) | |
1200 | return ERR_PTR(ret); | |
1201 | ||
e02119d5 | 1202 | root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location); |
5eda7b5e CM |
1203 | if (IS_ERR(root)) |
1204 | return root; | |
3394e160 | 1205 | |
4df27c4d | 1206 | WARN_ON(btrfs_root_refs(&root->root_item) == 0); |
3394e160 CM |
1207 | set_anon_super(&root->anon_super, NULL); |
1208 | ||
4df27c4d YZ |
1209 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); |
1210 | if (ret) | |
1211 | goto fail; | |
1212 | ||
1213 | spin_lock(&fs_info->fs_roots_radix_lock); | |
2619ba1f CM |
1214 | ret = radix_tree_insert(&fs_info->fs_roots_radix, |
1215 | (unsigned long)root->root_key.objectid, | |
0f7d52f4 | 1216 | root); |
c71bf099 | 1217 | if (ret == 0) { |
4df27c4d | 1218 | root->in_radix = 1; |
c71bf099 YZ |
1219 | root->clean_orphans = 1; |
1220 | } | |
4df27c4d YZ |
1221 | spin_unlock(&fs_info->fs_roots_radix_lock); |
1222 | radix_tree_preload_end(); | |
0f7d52f4 | 1223 | if (ret) { |
4df27c4d YZ |
1224 | if (ret == -EEXIST) { |
1225 | free_fs_root(root); | |
1226 | goto again; | |
1227 | } | |
1228 | goto fail; | |
0f7d52f4 | 1229 | } |
4df27c4d YZ |
1230 | |
1231 | ret = btrfs_find_dead_roots(fs_info->tree_root, | |
1232 | root->root_key.objectid); | |
1233 | WARN_ON(ret); | |
edbd8d4e | 1234 | return root; |
4df27c4d YZ |
1235 | fail: |
1236 | free_fs_root(root); | |
1237 | return ERR_PTR(ret); | |
edbd8d4e CM |
1238 | } |
1239 | ||
1240 | struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, | |
1241 | struct btrfs_key *location, | |
1242 | const char *name, int namelen) | |
1243 | { | |
4df27c4d YZ |
1244 | return btrfs_read_fs_root_no_name(fs_info, location); |
1245 | #if 0 | |
edbd8d4e CM |
1246 | struct btrfs_root *root; |
1247 | int ret; | |
1248 | ||
1249 | root = btrfs_read_fs_root_no_name(fs_info, location); | |
1250 | if (!root) | |
1251 | return NULL; | |
58176a96 | 1252 | |
4313b399 CM |
1253 | if (root->in_sysfs) |
1254 | return root; | |
1255 | ||
58176a96 JB |
1256 | ret = btrfs_set_root_name(root, name, namelen); |
1257 | if (ret) { | |
5f39d397 | 1258 | free_extent_buffer(root->node); |
58176a96 JB |
1259 | kfree(root); |
1260 | return ERR_PTR(ret); | |
1261 | } | |
4df27c4d | 1262 | |
58176a96 JB |
1263 | ret = btrfs_sysfs_add_root(root); |
1264 | if (ret) { | |
5f39d397 | 1265 | free_extent_buffer(root->node); |
58176a96 JB |
1266 | kfree(root->name); |
1267 | kfree(root); | |
1268 | return ERR_PTR(ret); | |
1269 | } | |
4313b399 | 1270 | root->in_sysfs = 1; |
0f7d52f4 | 1271 | return root; |
4df27c4d | 1272 | #endif |
0f7d52f4 | 1273 | } |
04160088 CM |
1274 | |
1275 | static int btrfs_congested_fn(void *congested_data, int bdi_bits) | |
1276 | { | |
1277 | struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; | |
1278 | int ret = 0; | |
04160088 CM |
1279 | struct btrfs_device *device; |
1280 | struct backing_dev_info *bdi; | |
b7967db7 | 1281 | |
c6e30871 | 1282 | list_for_each_entry(device, &info->fs_devices->devices, dev_list) { |
dfe25020 CM |
1283 | if (!device->bdev) |
1284 | continue; | |
04160088 CM |
1285 | bdi = blk_get_backing_dev_info(device->bdev); |
1286 | if (bdi && bdi_congested(bdi, bdi_bits)) { | |
1287 | ret = 1; | |
1288 | break; | |
1289 | } | |
1290 | } | |
1291 | return ret; | |
1292 | } | |
1293 | ||
38b66988 CM |
1294 | /* |
1295 | * this unplugs every device on the box, and it is only used when page | |
1296 | * is null | |
1297 | */ | |
1298 | static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page) | |
1299 | { | |
38b66988 CM |
1300 | struct btrfs_device *device; |
1301 | struct btrfs_fs_info *info; | |
1302 | ||
1303 | info = (struct btrfs_fs_info *)bdi->unplug_io_data; | |
c6e30871 | 1304 | list_for_each_entry(device, &info->fs_devices->devices, dev_list) { |
d20f7043 CM |
1305 | if (!device->bdev) |
1306 | continue; | |
1307 | ||
38b66988 | 1308 | bdi = blk_get_backing_dev_info(device->bdev); |
d397712b | 1309 | if (bdi->unplug_io_fn) |
38b66988 | 1310 | bdi->unplug_io_fn(bdi, page); |
38b66988 CM |
1311 | } |
1312 | } | |
1313 | ||
b2950863 | 1314 | static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) |
04160088 | 1315 | { |
38b66988 | 1316 | struct inode *inode; |
f2d8d74d CM |
1317 | struct extent_map_tree *em_tree; |
1318 | struct extent_map *em; | |
bcbfce8a | 1319 | struct address_space *mapping; |
38b66988 CM |
1320 | u64 offset; |
1321 | ||
bcbfce8a | 1322 | /* the generic O_DIRECT read code does this */ |
9f0ba5bd | 1323 | if (1 || !page) { |
38b66988 CM |
1324 | __unplug_io_fn(bdi, page); |
1325 | return; | |
1326 | } | |
1327 | ||
bcbfce8a CM |
1328 | /* |
1329 | * page->mapping may change at any time. Get a consistent copy | |
1330 | * and use that for everything below | |
1331 | */ | |
1332 | smp_mb(); | |
1333 | mapping = page->mapping; | |
1334 | if (!mapping) | |
1335 | return; | |
1336 | ||
1337 | inode = mapping->host; | |
240d5d48 CM |
1338 | |
1339 | /* | |
1340 | * don't do the expensive searching for a small number of | |
1341 | * devices | |
1342 | */ | |
1343 | if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) { | |
1344 | __unplug_io_fn(bdi, page); | |
1345 | return; | |
1346 | } | |
1347 | ||
38b66988 | 1348 | offset = page_offset(page); |
04160088 | 1349 | |
f2d8d74d | 1350 | em_tree = &BTRFS_I(inode)->extent_tree; |
890871be | 1351 | read_lock(&em_tree->lock); |
f2d8d74d | 1352 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); |
890871be | 1353 | read_unlock(&em_tree->lock); |
89642229 CM |
1354 | if (!em) { |
1355 | __unplug_io_fn(bdi, page); | |
f2d8d74d | 1356 | return; |
89642229 | 1357 | } |
f2d8d74d | 1358 | |
89642229 CM |
1359 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
1360 | free_extent_map(em); | |
1361 | __unplug_io_fn(bdi, page); | |
1362 | return; | |
1363 | } | |
f2d8d74d CM |
1364 | offset = offset - em->start; |
1365 | btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree, | |
1366 | em->block_start + offset, page); | |
1367 | free_extent_map(em); | |
04160088 CM |
1368 | } |
1369 | ||
ad081f14 JA |
1370 | /* |
1371 | * If this fails, caller must call bdi_destroy() to get rid of the | |
1372 | * bdi again. | |
1373 | */ | |
04160088 CM |
1374 | static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) |
1375 | { | |
ad081f14 JA |
1376 | int err; |
1377 | ||
d993831f | 1378 | bdi->name = "btrfs"; |
ad081f14 JA |
1379 | bdi->capabilities = BDI_CAP_MAP_COPY; |
1380 | err = bdi_init(bdi); | |
1381 | if (err) | |
1382 | return err; | |
1383 | ||
1384 | err = bdi_register(bdi, NULL, "btrfs-%d", | |
1385 | atomic_inc_return(&btrfs_bdi_num)); | |
76dda93c YZ |
1386 | if (err) { |
1387 | bdi_destroy(bdi); | |
ad081f14 | 1388 | return err; |
76dda93c | 1389 | } |
ad081f14 | 1390 | |
4575c9cc | 1391 | bdi->ra_pages = default_backing_dev_info.ra_pages; |
04160088 CM |
1392 | bdi->unplug_io_fn = btrfs_unplug_io_fn; |
1393 | bdi->unplug_io_data = info; | |
1394 | bdi->congested_fn = btrfs_congested_fn; | |
1395 | bdi->congested_data = info; | |
1396 | return 0; | |
1397 | } | |
1398 | ||
ce9adaa5 CM |
1399 | static int bio_ready_for_csum(struct bio *bio) |
1400 | { | |
1401 | u64 length = 0; | |
1402 | u64 buf_len = 0; | |
1403 | u64 start = 0; | |
1404 | struct page *page; | |
1405 | struct extent_io_tree *io_tree = NULL; | |
1406 | struct btrfs_fs_info *info = NULL; | |
1407 | struct bio_vec *bvec; | |
1408 | int i; | |
1409 | int ret; | |
1410 | ||
1411 | bio_for_each_segment(bvec, bio, i) { | |
1412 | page = bvec->bv_page; | |
1413 | if (page->private == EXTENT_PAGE_PRIVATE) { | |
1414 | length += bvec->bv_len; | |
1415 | continue; | |
1416 | } | |
1417 | if (!page->private) { | |
1418 | length += bvec->bv_len; | |
1419 | continue; | |
1420 | } | |
1421 | length = bvec->bv_len; | |
1422 | buf_len = page->private >> 2; | |
1423 | start = page_offset(page) + bvec->bv_offset; | |
1424 | io_tree = &BTRFS_I(page->mapping->host)->io_tree; | |
1425 | info = BTRFS_I(page->mapping->host)->root->fs_info; | |
1426 | } | |
1427 | /* are we fully contained in this bio? */ | |
1428 | if (buf_len <= length) | |
1429 | return 1; | |
1430 | ||
1431 | ret = extent_range_uptodate(io_tree, start + length, | |
1432 | start + buf_len - 1); | |
ce9adaa5 CM |
1433 | return ret; |
1434 | } | |
1435 | ||
8b712842 CM |
1436 | /* |
1437 | * called by the kthread helper functions to finally call the bio end_io | |
1438 | * functions. This is where read checksum verification actually happens | |
1439 | */ | |
1440 | static void end_workqueue_fn(struct btrfs_work *work) | |
ce9adaa5 | 1441 | { |
ce9adaa5 | 1442 | struct bio *bio; |
8b712842 CM |
1443 | struct end_io_wq *end_io_wq; |
1444 | struct btrfs_fs_info *fs_info; | |
ce9adaa5 | 1445 | int error; |
ce9adaa5 | 1446 | |
8b712842 CM |
1447 | end_io_wq = container_of(work, struct end_io_wq, work); |
1448 | bio = end_io_wq->bio; | |
1449 | fs_info = end_io_wq->info; | |
ce9adaa5 | 1450 | |
cad321ad | 1451 | /* metadata bio reads are special because the whole tree block must |
8b712842 CM |
1452 | * be checksummed at once. This makes sure the entire block is in |
1453 | * ram and up to date before trying to verify things. For | |
1454 | * blocksize <= pagesize, it is basically a noop | |
1455 | */ | |
cad321ad CM |
1456 | if (!(bio->bi_rw & (1 << BIO_RW)) && end_io_wq->metadata && |
1457 | !bio_ready_for_csum(bio)) { | |
d20f7043 | 1458 | btrfs_queue_worker(&fs_info->endio_meta_workers, |
8b712842 CM |
1459 | &end_io_wq->work); |
1460 | return; | |
1461 | } | |
1462 | error = end_io_wq->error; | |
1463 | bio->bi_private = end_io_wq->private; | |
1464 | bio->bi_end_io = end_io_wq->end_io; | |
1465 | kfree(end_io_wq); | |
8b712842 | 1466 | bio_endio(bio, error); |
44b8bd7e CM |
1467 | } |
1468 | ||
a74a4b97 CM |
1469 | static int cleaner_kthread(void *arg) |
1470 | { | |
1471 | struct btrfs_root *root = arg; | |
1472 | ||
1473 | do { | |
1474 | smp_mb(); | |
1475 | if (root->fs_info->closing) | |
1476 | break; | |
1477 | ||
1478 | vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); | |
76dda93c YZ |
1479 | |
1480 | if (!(root->fs_info->sb->s_flags & MS_RDONLY) && | |
1481 | mutex_trylock(&root->fs_info->cleaner_mutex)) { | |
24bbcf04 | 1482 | btrfs_run_delayed_iputs(root); |
76dda93c YZ |
1483 | btrfs_clean_old_snapshots(root); |
1484 | mutex_unlock(&root->fs_info->cleaner_mutex); | |
1485 | } | |
a74a4b97 CM |
1486 | |
1487 | if (freezing(current)) { | |
1488 | refrigerator(); | |
1489 | } else { | |
1490 | smp_mb(); | |
1491 | if (root->fs_info->closing) | |
1492 | break; | |
1493 | set_current_state(TASK_INTERRUPTIBLE); | |
1494 | schedule(); | |
1495 | __set_current_state(TASK_RUNNING); | |
1496 | } | |
1497 | } while (!kthread_should_stop()); | |
1498 | return 0; | |
1499 | } | |
1500 | ||
1501 | static int transaction_kthread(void *arg) | |
1502 | { | |
1503 | struct btrfs_root *root = arg; | |
1504 | struct btrfs_trans_handle *trans; | |
1505 | struct btrfs_transaction *cur; | |
1506 | unsigned long now; | |
1507 | unsigned long delay; | |
1508 | int ret; | |
1509 | ||
1510 | do { | |
1511 | smp_mb(); | |
1512 | if (root->fs_info->closing) | |
1513 | break; | |
1514 | ||
1515 | delay = HZ * 30; | |
1516 | vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); | |
1517 | mutex_lock(&root->fs_info->transaction_kthread_mutex); | |
1518 | ||
1519 | mutex_lock(&root->fs_info->trans_mutex); | |
1520 | cur = root->fs_info->running_transaction; | |
1521 | if (!cur) { | |
1522 | mutex_unlock(&root->fs_info->trans_mutex); | |
1523 | goto sleep; | |
1524 | } | |
31153d81 | 1525 | |
a74a4b97 CM |
1526 | now = get_seconds(); |
1527 | if (now < cur->start_time || now - cur->start_time < 30) { | |
1528 | mutex_unlock(&root->fs_info->trans_mutex); | |
1529 | delay = HZ * 5; | |
1530 | goto sleep; | |
1531 | } | |
1532 | mutex_unlock(&root->fs_info->trans_mutex); | |
a74a4b97 CM |
1533 | trans = btrfs_start_transaction(root, 1); |
1534 | ret = btrfs_commit_transaction(trans, root); | |
56bec294 | 1535 | |
a74a4b97 CM |
1536 | sleep: |
1537 | wake_up_process(root->fs_info->cleaner_kthread); | |
1538 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
1539 | ||
1540 | if (freezing(current)) { | |
1541 | refrigerator(); | |
1542 | } else { | |
1543 | if (root->fs_info->closing) | |
1544 | break; | |
1545 | set_current_state(TASK_INTERRUPTIBLE); | |
1546 | schedule_timeout(delay); | |
1547 | __set_current_state(TASK_RUNNING); | |
1548 | } | |
1549 | } while (!kthread_should_stop()); | |
1550 | return 0; | |
1551 | } | |
1552 | ||
8a4b83cc | 1553 | struct btrfs_root *open_ctree(struct super_block *sb, |
dfe25020 CM |
1554 | struct btrfs_fs_devices *fs_devices, |
1555 | char *options) | |
2e635a27 | 1556 | { |
db94535d CM |
1557 | u32 sectorsize; |
1558 | u32 nodesize; | |
1559 | u32 leafsize; | |
1560 | u32 blocksize; | |
87ee04eb | 1561 | u32 stripesize; |
84234f3a | 1562 | u64 generation; |
f2b636e8 | 1563 | u64 features; |
3de4586c | 1564 | struct btrfs_key location; |
a061fc8d | 1565 | struct buffer_head *bh; |
e02119d5 | 1566 | struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root), |
e20d96d6 | 1567 | GFP_NOFS); |
d20f7043 CM |
1568 | struct btrfs_root *csum_root = kzalloc(sizeof(struct btrfs_root), |
1569 | GFP_NOFS); | |
e02119d5 | 1570 | struct btrfs_root *tree_root = kzalloc(sizeof(struct btrfs_root), |
e20d96d6 | 1571 | GFP_NOFS); |
8790d502 | 1572 | struct btrfs_fs_info *fs_info = kzalloc(sizeof(*fs_info), |
e20d96d6 | 1573 | GFP_NOFS); |
e02119d5 | 1574 | struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root), |
0b86a832 | 1575 | GFP_NOFS); |
e02119d5 | 1576 | struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root), |
0b86a832 | 1577 | GFP_NOFS); |
e02119d5 CM |
1578 | struct btrfs_root *log_tree_root; |
1579 | ||
eb60ceac | 1580 | int ret; |
e58ca020 | 1581 | int err = -EINVAL; |
4543df7e | 1582 | |
2c90e5d6 | 1583 | struct btrfs_super_block *disk_super; |
8790d502 | 1584 | |
0463bb4e | 1585 | if (!extent_root || !tree_root || !fs_info || |
d20f7043 | 1586 | !chunk_root || !dev_root || !csum_root) { |
39279cc3 CM |
1587 | err = -ENOMEM; |
1588 | goto fail; | |
1589 | } | |
76dda93c YZ |
1590 | |
1591 | ret = init_srcu_struct(&fs_info->subvol_srcu); | |
1592 | if (ret) { | |
1593 | err = ret; | |
1594 | goto fail; | |
1595 | } | |
1596 | ||
1597 | ret = setup_bdi(fs_info, &fs_info->bdi); | |
1598 | if (ret) { | |
1599 | err = ret; | |
1600 | goto fail_srcu; | |
1601 | } | |
1602 | ||
1603 | fs_info->btree_inode = new_inode(sb); | |
1604 | if (!fs_info->btree_inode) { | |
1605 | err = -ENOMEM; | |
1606 | goto fail_bdi; | |
1607 | } | |
1608 | ||
1609 | INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); | |
8fd17795 | 1610 | INIT_LIST_HEAD(&fs_info->trans_list); |
facda1e7 | 1611 | INIT_LIST_HEAD(&fs_info->dead_roots); |
24bbcf04 | 1612 | INIT_LIST_HEAD(&fs_info->delayed_iputs); |
19c00ddc | 1613 | INIT_LIST_HEAD(&fs_info->hashers); |
ea8c2819 | 1614 | INIT_LIST_HEAD(&fs_info->delalloc_inodes); |
5a3f23d5 | 1615 | INIT_LIST_HEAD(&fs_info->ordered_operations); |
11833d66 | 1616 | INIT_LIST_HEAD(&fs_info->caching_block_groups); |
1832a6d5 | 1617 | spin_lock_init(&fs_info->delalloc_lock); |
cee36a03 | 1618 | spin_lock_init(&fs_info->new_trans_lock); |
31153d81 | 1619 | spin_lock_init(&fs_info->ref_cache_lock); |
76dda93c | 1620 | spin_lock_init(&fs_info->fs_roots_radix_lock); |
24bbcf04 | 1621 | spin_lock_init(&fs_info->delayed_iput_lock); |
19c00ddc | 1622 | |
58176a96 | 1623 | init_completion(&fs_info->kobj_unregister); |
9f5fae2f CM |
1624 | fs_info->tree_root = tree_root; |
1625 | fs_info->extent_root = extent_root; | |
d20f7043 | 1626 | fs_info->csum_root = csum_root; |
0b86a832 CM |
1627 | fs_info->chunk_root = chunk_root; |
1628 | fs_info->dev_root = dev_root; | |
8a4b83cc | 1629 | fs_info->fs_devices = fs_devices; |
0b86a832 | 1630 | INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); |
6324fbf3 | 1631 | INIT_LIST_HEAD(&fs_info->space_info); |
0b86a832 | 1632 | btrfs_mapping_init(&fs_info->mapping_tree); |
cb03c743 | 1633 | atomic_set(&fs_info->nr_async_submits, 0); |
771ed689 | 1634 | atomic_set(&fs_info->async_delalloc_pages, 0); |
8c8bee1d | 1635 | atomic_set(&fs_info->async_submit_draining, 0); |
0986fe9e | 1636 | atomic_set(&fs_info->nr_async_bios, 0); |
e20d96d6 | 1637 | fs_info->sb = sb; |
6f568d35 | 1638 | fs_info->max_inline = 8192 * 1024; |
9ed74f2d | 1639 | fs_info->metadata_ratio = 0; |
c8b97818 | 1640 | |
b34b086c CM |
1641 | fs_info->thread_pool_size = min_t(unsigned long, |
1642 | num_online_cpus() + 2, 8); | |
0afbaf8c | 1643 | |
3eaa2885 CM |
1644 | INIT_LIST_HEAD(&fs_info->ordered_extents); |
1645 | spin_lock_init(&fs_info->ordered_extent_lock); | |
1646 | ||
a061fc8d CM |
1647 | sb->s_blocksize = 4096; |
1648 | sb->s_blocksize_bits = blksize_bits(4096); | |
32a88aa1 | 1649 | sb->s_bdi = &fs_info->bdi; |
a061fc8d | 1650 | |
76dda93c YZ |
1651 | fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID; |
1652 | fs_info->btree_inode->i_nlink = 1; | |
0afbaf8c CM |
1653 | /* |
1654 | * we set the i_size on the btree inode to the max possible int. | |
1655 | * the real end of the address space is determined by all of | |
1656 | * the devices in the system | |
1657 | */ | |
1658 | fs_info->btree_inode->i_size = OFFSET_MAX; | |
d98237b3 | 1659 | fs_info->btree_inode->i_mapping->a_ops = &btree_aops; |
04160088 CM |
1660 | fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; |
1661 | ||
5d4f98a2 | 1662 | RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node); |
d1310b2e | 1663 | extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, |
5f39d397 CM |
1664 | fs_info->btree_inode->i_mapping, |
1665 | GFP_NOFS); | |
d1310b2e CM |
1666 | extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree, |
1667 | GFP_NOFS); | |
1668 | ||
1669 | BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; | |
0da5468f | 1670 | |
76dda93c YZ |
1671 | BTRFS_I(fs_info->btree_inode)->root = tree_root; |
1672 | memset(&BTRFS_I(fs_info->btree_inode)->location, 0, | |
1673 | sizeof(struct btrfs_key)); | |
1674 | BTRFS_I(fs_info->btree_inode)->dummy_inode = 1; | |
c65ddb52 | 1675 | insert_inode_hash(fs_info->btree_inode); |
76dda93c | 1676 | |
0f9dd46c | 1677 | spin_lock_init(&fs_info->block_group_cache_lock); |
6bef4d31 | 1678 | fs_info->block_group_cache_tree = RB_ROOT; |
0f9dd46c | 1679 | |
11833d66 | 1680 | extent_io_tree_init(&fs_info->freed_extents[0], |
1a5bc167 | 1681 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
11833d66 YZ |
1682 | extent_io_tree_init(&fs_info->freed_extents[1], |
1683 | fs_info->btree_inode->i_mapping, GFP_NOFS); | |
1684 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
e66f709b | 1685 | fs_info->do_barriers = 1; |
e18e4809 | 1686 | |
39279cc3 | 1687 | |
79154b1b | 1688 | mutex_init(&fs_info->trans_mutex); |
5a3f23d5 | 1689 | mutex_init(&fs_info->ordered_operations_mutex); |
e02119d5 | 1690 | mutex_init(&fs_info->tree_log_mutex); |
925baedd | 1691 | mutex_init(&fs_info->chunk_mutex); |
a74a4b97 CM |
1692 | mutex_init(&fs_info->transaction_kthread_mutex); |
1693 | mutex_init(&fs_info->cleaner_mutex); | |
7d9eb12c | 1694 | mutex_init(&fs_info->volume_mutex); |
276e680d | 1695 | init_rwsem(&fs_info->extent_commit_sem); |
c71bf099 | 1696 | init_rwsem(&fs_info->cleanup_work_sem); |
76dda93c | 1697 | init_rwsem(&fs_info->subvol_sem); |
fa9c0d79 CM |
1698 | |
1699 | btrfs_init_free_cluster(&fs_info->meta_alloc_cluster); | |
1700 | btrfs_init_free_cluster(&fs_info->data_alloc_cluster); | |
1701 | ||
e6dcd2dc | 1702 | init_waitqueue_head(&fs_info->transaction_throttle); |
f9295749 | 1703 | init_waitqueue_head(&fs_info->transaction_wait); |
4854ddd0 | 1704 | init_waitqueue_head(&fs_info->async_submit_wait); |
3768f368 | 1705 | |
0b86a832 | 1706 | __setup_root(4096, 4096, 4096, 4096, tree_root, |
2c90e5d6 | 1707 | fs_info, BTRFS_ROOT_TREE_OBJECTID); |
7eccb903 | 1708 | |
d98237b3 | 1709 | |
a512bbf8 | 1710 | bh = btrfs_read_dev_super(fs_devices->latest_bdev); |
a061fc8d | 1711 | if (!bh) |
39279cc3 | 1712 | goto fail_iput; |
39279cc3 | 1713 | |
a061fc8d | 1714 | memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy)); |
2d69a0f8 YZ |
1715 | memcpy(&fs_info->super_for_commit, &fs_info->super_copy, |
1716 | sizeof(fs_info->super_for_commit)); | |
a061fc8d | 1717 | brelse(bh); |
5f39d397 | 1718 | |
a061fc8d | 1719 | memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE); |
0b86a832 | 1720 | |
5f39d397 | 1721 | disk_super = &fs_info->super_copy; |
0f7d52f4 | 1722 | if (!btrfs_super_root(disk_super)) |
c6e2bac1 | 1723 | goto fail_iput; |
0f7d52f4 | 1724 | |
2b82032c YZ |
1725 | ret = btrfs_parse_options(tree_root, options); |
1726 | if (ret) { | |
1727 | err = ret; | |
c6e2bac1 | 1728 | goto fail_iput; |
2b82032c | 1729 | } |
dfe25020 | 1730 | |
f2b636e8 JB |
1731 | features = btrfs_super_incompat_flags(disk_super) & |
1732 | ~BTRFS_FEATURE_INCOMPAT_SUPP; | |
1733 | if (features) { | |
1734 | printk(KERN_ERR "BTRFS: couldn't mount because of " | |
1735 | "unsupported optional features (%Lx).\n", | |
21380931 | 1736 | (unsigned long long)features); |
f2b636e8 | 1737 | err = -EINVAL; |
c6e2bac1 | 1738 | goto fail_iput; |
f2b636e8 JB |
1739 | } |
1740 | ||
5d4f98a2 YZ |
1741 | features = btrfs_super_incompat_flags(disk_super); |
1742 | if (!(features & BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF)) { | |
1743 | features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; | |
1744 | btrfs_set_super_incompat_flags(disk_super, features); | |
1745 | } | |
1746 | ||
f2b636e8 JB |
1747 | features = btrfs_super_compat_ro_flags(disk_super) & |
1748 | ~BTRFS_FEATURE_COMPAT_RO_SUPP; | |
1749 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
1750 | printk(KERN_ERR "BTRFS: couldn't mount RDWR because of " | |
1751 | "unsupported option features (%Lx).\n", | |
21380931 | 1752 | (unsigned long long)features); |
f2b636e8 | 1753 | err = -EINVAL; |
c6e2bac1 | 1754 | goto fail_iput; |
f2b636e8 | 1755 | } |
61d92c32 CM |
1756 | |
1757 | btrfs_init_workers(&fs_info->generic_worker, | |
1758 | "genwork", 1, NULL); | |
1759 | ||
5443be45 | 1760 | btrfs_init_workers(&fs_info->workers, "worker", |
61d92c32 CM |
1761 | fs_info->thread_pool_size, |
1762 | &fs_info->generic_worker); | |
c8b97818 | 1763 | |
771ed689 | 1764 | btrfs_init_workers(&fs_info->delalloc_workers, "delalloc", |
61d92c32 CM |
1765 | fs_info->thread_pool_size, |
1766 | &fs_info->generic_worker); | |
771ed689 | 1767 | |
5443be45 | 1768 | btrfs_init_workers(&fs_info->submit_workers, "submit", |
b720d209 | 1769 | min_t(u64, fs_devices->num_devices, |
61d92c32 CM |
1770 | fs_info->thread_pool_size), |
1771 | &fs_info->generic_worker); | |
e3ccfa98 JB |
1772 | btrfs_init_workers(&fs_info->enospc_workers, "enospc", |
1773 | fs_info->thread_pool_size, | |
1774 | &fs_info->generic_worker); | |
61b49440 CM |
1775 | |
1776 | /* a higher idle thresh on the submit workers makes it much more | |
1777 | * likely that bios will be send down in a sane order to the | |
1778 | * devices | |
1779 | */ | |
1780 | fs_info->submit_workers.idle_thresh = 64; | |
53863232 | 1781 | |
771ed689 | 1782 | fs_info->workers.idle_thresh = 16; |
4a69a410 | 1783 | fs_info->workers.ordered = 1; |
61b49440 | 1784 | |
771ed689 CM |
1785 | fs_info->delalloc_workers.idle_thresh = 2; |
1786 | fs_info->delalloc_workers.ordered = 1; | |
1787 | ||
61d92c32 CM |
1788 | btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1, |
1789 | &fs_info->generic_worker); | |
5443be45 | 1790 | btrfs_init_workers(&fs_info->endio_workers, "endio", |
61d92c32 CM |
1791 | fs_info->thread_pool_size, |
1792 | &fs_info->generic_worker); | |
d20f7043 | 1793 | btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta", |
61d92c32 CM |
1794 | fs_info->thread_pool_size, |
1795 | &fs_info->generic_worker); | |
cad321ad | 1796 | btrfs_init_workers(&fs_info->endio_meta_write_workers, |
61d92c32 CM |
1797 | "endio-meta-write", fs_info->thread_pool_size, |
1798 | &fs_info->generic_worker); | |
5443be45 | 1799 | btrfs_init_workers(&fs_info->endio_write_workers, "endio-write", |
61d92c32 CM |
1800 | fs_info->thread_pool_size, |
1801 | &fs_info->generic_worker); | |
61b49440 CM |
1802 | |
1803 | /* | |
1804 | * endios are largely parallel and should have a very | |
1805 | * low idle thresh | |
1806 | */ | |
1807 | fs_info->endio_workers.idle_thresh = 4; | |
b51912c9 CM |
1808 | fs_info->endio_meta_workers.idle_thresh = 4; |
1809 | ||
9042846b CM |
1810 | fs_info->endio_write_workers.idle_thresh = 2; |
1811 | fs_info->endio_meta_write_workers.idle_thresh = 2; | |
1812 | ||
4543df7e | 1813 | btrfs_start_workers(&fs_info->workers, 1); |
61d92c32 | 1814 | btrfs_start_workers(&fs_info->generic_worker, 1); |
1cc127b5 | 1815 | btrfs_start_workers(&fs_info->submit_workers, 1); |
771ed689 | 1816 | btrfs_start_workers(&fs_info->delalloc_workers, 1); |
247e743c | 1817 | btrfs_start_workers(&fs_info->fixup_workers, 1); |
9042846b CM |
1818 | btrfs_start_workers(&fs_info->endio_workers, 1); |
1819 | btrfs_start_workers(&fs_info->endio_meta_workers, 1); | |
1820 | btrfs_start_workers(&fs_info->endio_meta_write_workers, 1); | |
1821 | btrfs_start_workers(&fs_info->endio_write_workers, 1); | |
e3ccfa98 | 1822 | btrfs_start_workers(&fs_info->enospc_workers, 1); |
4543df7e | 1823 | |
4575c9cc | 1824 | fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); |
c8b97818 CM |
1825 | fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, |
1826 | 4 * 1024 * 1024 / PAGE_CACHE_SIZE); | |
4575c9cc | 1827 | |
db94535d CM |
1828 | nodesize = btrfs_super_nodesize(disk_super); |
1829 | leafsize = btrfs_super_leafsize(disk_super); | |
1830 | sectorsize = btrfs_super_sectorsize(disk_super); | |
87ee04eb | 1831 | stripesize = btrfs_super_stripesize(disk_super); |
db94535d CM |
1832 | tree_root->nodesize = nodesize; |
1833 | tree_root->leafsize = leafsize; | |
1834 | tree_root->sectorsize = sectorsize; | |
87ee04eb | 1835 | tree_root->stripesize = stripesize; |
a061fc8d CM |
1836 | |
1837 | sb->s_blocksize = sectorsize; | |
1838 | sb->s_blocksize_bits = blksize_bits(sectorsize); | |
db94535d | 1839 | |
39279cc3 CM |
1840 | if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, |
1841 | sizeof(disk_super->magic))) { | |
d397712b | 1842 | printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id); |
39279cc3 CM |
1843 | goto fail_sb_buffer; |
1844 | } | |
19c00ddc | 1845 | |
925baedd | 1846 | mutex_lock(&fs_info->chunk_mutex); |
e4404d6e | 1847 | ret = btrfs_read_sys_array(tree_root); |
925baedd | 1848 | mutex_unlock(&fs_info->chunk_mutex); |
84eed90f | 1849 | if (ret) { |
d397712b CM |
1850 | printk(KERN_WARNING "btrfs: failed to read the system " |
1851 | "array on %s\n", sb->s_id); | |
5d4f98a2 | 1852 | goto fail_sb_buffer; |
84eed90f | 1853 | } |
0b86a832 CM |
1854 | |
1855 | blocksize = btrfs_level_size(tree_root, | |
1856 | btrfs_super_chunk_root_level(disk_super)); | |
84234f3a | 1857 | generation = btrfs_super_chunk_root_generation(disk_super); |
0b86a832 CM |
1858 | |
1859 | __setup_root(nodesize, leafsize, sectorsize, stripesize, | |
1860 | chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); | |
1861 | ||
1862 | chunk_root->node = read_tree_block(chunk_root, | |
1863 | btrfs_super_chunk_root(disk_super), | |
84234f3a | 1864 | blocksize, generation); |
0b86a832 | 1865 | BUG_ON(!chunk_root->node); |
83121942 DW |
1866 | if (!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) { |
1867 | printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n", | |
1868 | sb->s_id); | |
1869 | goto fail_chunk_root; | |
1870 | } | |
5d4f98a2 YZ |
1871 | btrfs_set_root_node(&chunk_root->root_item, chunk_root->node); |
1872 | chunk_root->commit_root = btrfs_root_node(chunk_root); | |
0b86a832 | 1873 | |
e17cade2 | 1874 | read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, |
d397712b CM |
1875 | (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node), |
1876 | BTRFS_UUID_SIZE); | |
e17cade2 | 1877 | |
925baedd | 1878 | mutex_lock(&fs_info->chunk_mutex); |
0b86a832 | 1879 | ret = btrfs_read_chunk_tree(chunk_root); |
925baedd | 1880 | mutex_unlock(&fs_info->chunk_mutex); |
2b82032c | 1881 | if (ret) { |
d397712b CM |
1882 | printk(KERN_WARNING "btrfs: failed to read chunk tree on %s\n", |
1883 | sb->s_id); | |
2b82032c YZ |
1884 | goto fail_chunk_root; |
1885 | } | |
0b86a832 | 1886 | |
dfe25020 CM |
1887 | btrfs_close_extra_devices(fs_devices); |
1888 | ||
db94535d CM |
1889 | blocksize = btrfs_level_size(tree_root, |
1890 | btrfs_super_root_level(disk_super)); | |
84234f3a | 1891 | generation = btrfs_super_generation(disk_super); |
0b86a832 | 1892 | |
e20d96d6 | 1893 | tree_root->node = read_tree_block(tree_root, |
db94535d | 1894 | btrfs_super_root(disk_super), |
84234f3a | 1895 | blocksize, generation); |
39279cc3 | 1896 | if (!tree_root->node) |
2b82032c | 1897 | goto fail_chunk_root; |
83121942 DW |
1898 | if (!test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) { |
1899 | printk(KERN_WARNING "btrfs: failed to read tree root on %s\n", | |
1900 | sb->s_id); | |
1901 | goto fail_tree_root; | |
1902 | } | |
5d4f98a2 YZ |
1903 | btrfs_set_root_node(&tree_root->root_item, tree_root->node); |
1904 | tree_root->commit_root = btrfs_root_node(tree_root); | |
db94535d CM |
1905 | |
1906 | ret = find_and_setup_root(tree_root, fs_info, | |
e20d96d6 | 1907 | BTRFS_EXTENT_TREE_OBJECTID, extent_root); |
0b86a832 | 1908 | if (ret) |
39279cc3 | 1909 | goto fail_tree_root; |
0b86a832 CM |
1910 | extent_root->track_dirty = 1; |
1911 | ||
1912 | ret = find_and_setup_root(tree_root, fs_info, | |
1913 | BTRFS_DEV_TREE_OBJECTID, dev_root); | |
0b86a832 CM |
1914 | if (ret) |
1915 | goto fail_extent_root; | |
5d4f98a2 | 1916 | dev_root->track_dirty = 1; |
3768f368 | 1917 | |
d20f7043 CM |
1918 | ret = find_and_setup_root(tree_root, fs_info, |
1919 | BTRFS_CSUM_TREE_OBJECTID, csum_root); | |
1920 | if (ret) | |
5d4f98a2 | 1921 | goto fail_dev_root; |
d20f7043 CM |
1922 | |
1923 | csum_root->track_dirty = 1; | |
1924 | ||
1b1d1f66 JB |
1925 | ret = btrfs_read_block_groups(extent_root); |
1926 | if (ret) { | |
1927 | printk(KERN_ERR "Failed to read block groups: %d\n", ret); | |
1928 | goto fail_block_groups; | |
1929 | } | |
9078a3e1 | 1930 | |
2d69a0f8 | 1931 | fs_info->generation = generation; |
c146afad | 1932 | fs_info->last_trans_committed = generation; |
d18a2c44 CM |
1933 | fs_info->data_alloc_profile = (u64)-1; |
1934 | fs_info->metadata_alloc_profile = (u64)-1; | |
1935 | fs_info->system_alloc_profile = fs_info->metadata_alloc_profile; | |
a74a4b97 CM |
1936 | fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, |
1937 | "btrfs-cleaner"); | |
57506d50 | 1938 | if (IS_ERR(fs_info->cleaner_kthread)) |
1b1d1f66 | 1939 | goto fail_block_groups; |
a74a4b97 CM |
1940 | |
1941 | fs_info->transaction_kthread = kthread_run(transaction_kthread, | |
1942 | tree_root, | |
1943 | "btrfs-transaction"); | |
57506d50 | 1944 | if (IS_ERR(fs_info->transaction_kthread)) |
3f157a2f | 1945 | goto fail_cleaner; |
a74a4b97 | 1946 | |
c289811c CM |
1947 | if (!btrfs_test_opt(tree_root, SSD) && |
1948 | !btrfs_test_opt(tree_root, NOSSD) && | |
1949 | !fs_info->fs_devices->rotating) { | |
1950 | printk(KERN_INFO "Btrfs detected SSD devices, enabling SSD " | |
1951 | "mode\n"); | |
1952 | btrfs_set_opt(fs_info->mount_opt, SSD); | |
1953 | } | |
1954 | ||
e02119d5 | 1955 | if (btrfs_super_log_root(disk_super) != 0) { |
e02119d5 CM |
1956 | u64 bytenr = btrfs_super_log_root(disk_super); |
1957 | ||
7c2ca468 | 1958 | if (fs_devices->rw_devices == 0) { |
d397712b CM |
1959 | printk(KERN_WARNING "Btrfs log replay required " |
1960 | "on RO media\n"); | |
7c2ca468 CM |
1961 | err = -EIO; |
1962 | goto fail_trans_kthread; | |
1963 | } | |
e02119d5 CM |
1964 | blocksize = |
1965 | btrfs_level_size(tree_root, | |
1966 | btrfs_super_log_root_level(disk_super)); | |
d18a2c44 | 1967 | |
e02119d5 CM |
1968 | log_tree_root = kzalloc(sizeof(struct btrfs_root), |
1969 | GFP_NOFS); | |
1970 | ||
1971 | __setup_root(nodesize, leafsize, sectorsize, stripesize, | |
1972 | log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID); | |
1973 | ||
1974 | log_tree_root->node = read_tree_block(tree_root, bytenr, | |
84234f3a YZ |
1975 | blocksize, |
1976 | generation + 1); | |
e02119d5 CM |
1977 | ret = btrfs_recover_log_trees(log_tree_root); |
1978 | BUG_ON(ret); | |
e556ce2c YZ |
1979 | |
1980 | if (sb->s_flags & MS_RDONLY) { | |
1981 | ret = btrfs_commit_super(tree_root); | |
1982 | BUG_ON(ret); | |
1983 | } | |
e02119d5 | 1984 | } |
1a40e23b | 1985 | |
76dda93c YZ |
1986 | ret = btrfs_find_orphan_roots(tree_root); |
1987 | BUG_ON(ret); | |
1988 | ||
7c2ca468 | 1989 | if (!(sb->s_flags & MS_RDONLY)) { |
5d4f98a2 | 1990 | ret = btrfs_recover_relocation(tree_root); |
d7ce5843 MX |
1991 | if (ret < 0) { |
1992 | printk(KERN_WARNING | |
1993 | "btrfs: failed to recover relocation\n"); | |
1994 | err = -EINVAL; | |
1995 | goto fail_trans_kthread; | |
1996 | } | |
7c2ca468 | 1997 | } |
1a40e23b | 1998 | |
3de4586c CM |
1999 | location.objectid = BTRFS_FS_TREE_OBJECTID; |
2000 | location.type = BTRFS_ROOT_ITEM_KEY; | |
2001 | location.offset = (u64)-1; | |
2002 | ||
3de4586c CM |
2003 | fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); |
2004 | if (!fs_info->fs_root) | |
7c2ca468 | 2005 | goto fail_trans_kthread; |
c289811c | 2006 | |
e3acc2a6 JB |
2007 | if (!(sb->s_flags & MS_RDONLY)) { |
2008 | down_read(&fs_info->cleanup_work_sem); | |
2009 | btrfs_orphan_cleanup(fs_info->fs_root); | |
2010 | up_read(&fs_info->cleanup_work_sem); | |
2011 | } | |
2012 | ||
0f7d52f4 | 2013 | return tree_root; |
39279cc3 | 2014 | |
7c2ca468 CM |
2015 | fail_trans_kthread: |
2016 | kthread_stop(fs_info->transaction_kthread); | |
3f157a2f | 2017 | fail_cleaner: |
a74a4b97 | 2018 | kthread_stop(fs_info->cleaner_kthread); |
7c2ca468 CM |
2019 | |
2020 | /* | |
2021 | * make sure we're done with the btree inode before we stop our | |
2022 | * kthreads | |
2023 | */ | |
2024 | filemap_write_and_wait(fs_info->btree_inode->i_mapping); | |
2025 | invalidate_inode_pages2(fs_info->btree_inode->i_mapping); | |
2026 | ||
1b1d1f66 JB |
2027 | fail_block_groups: |
2028 | btrfs_free_block_groups(fs_info); | |
d20f7043 | 2029 | free_extent_buffer(csum_root->node); |
5d4f98a2 YZ |
2030 | free_extent_buffer(csum_root->commit_root); |
2031 | fail_dev_root: | |
2032 | free_extent_buffer(dev_root->node); | |
2033 | free_extent_buffer(dev_root->commit_root); | |
0b86a832 CM |
2034 | fail_extent_root: |
2035 | free_extent_buffer(extent_root->node); | |
5d4f98a2 | 2036 | free_extent_buffer(extent_root->commit_root); |
39279cc3 | 2037 | fail_tree_root: |
5f39d397 | 2038 | free_extent_buffer(tree_root->node); |
5d4f98a2 | 2039 | free_extent_buffer(tree_root->commit_root); |
2b82032c YZ |
2040 | fail_chunk_root: |
2041 | free_extent_buffer(chunk_root->node); | |
5d4f98a2 | 2042 | free_extent_buffer(chunk_root->commit_root); |
39279cc3 | 2043 | fail_sb_buffer: |
61d92c32 | 2044 | btrfs_stop_workers(&fs_info->generic_worker); |
247e743c | 2045 | btrfs_stop_workers(&fs_info->fixup_workers); |
771ed689 | 2046 | btrfs_stop_workers(&fs_info->delalloc_workers); |
8b712842 CM |
2047 | btrfs_stop_workers(&fs_info->workers); |
2048 | btrfs_stop_workers(&fs_info->endio_workers); | |
d20f7043 | 2049 | btrfs_stop_workers(&fs_info->endio_meta_workers); |
cad321ad | 2050 | btrfs_stop_workers(&fs_info->endio_meta_write_workers); |
e6dcd2dc | 2051 | btrfs_stop_workers(&fs_info->endio_write_workers); |
1cc127b5 | 2052 | btrfs_stop_workers(&fs_info->submit_workers); |
e3ccfa98 | 2053 | btrfs_stop_workers(&fs_info->enospc_workers); |
4543df7e | 2054 | fail_iput: |
7c2ca468 | 2055 | invalidate_inode_pages2(fs_info->btree_inode->i_mapping); |
4543df7e | 2056 | iput(fs_info->btree_inode); |
7e662854 | 2057 | |
dfe25020 | 2058 | btrfs_close_devices(fs_info->fs_devices); |
84eed90f | 2059 | btrfs_mapping_tree_free(&fs_info->mapping_tree); |
ad081f14 | 2060 | fail_bdi: |
7e662854 | 2061 | bdi_destroy(&fs_info->bdi); |
76dda93c YZ |
2062 | fail_srcu: |
2063 | cleanup_srcu_struct(&fs_info->subvol_srcu); | |
7e662854 | 2064 | fail: |
39279cc3 CM |
2065 | kfree(extent_root); |
2066 | kfree(tree_root); | |
2067 | kfree(fs_info); | |
83afeac4 JM |
2068 | kfree(chunk_root); |
2069 | kfree(dev_root); | |
d20f7043 | 2070 | kfree(csum_root); |
39279cc3 | 2071 | return ERR_PTR(err); |
eb60ceac CM |
2072 | } |
2073 | ||
f2984462 CM |
2074 | static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) |
2075 | { | |
2076 | char b[BDEVNAME_SIZE]; | |
2077 | ||
2078 | if (uptodate) { | |
2079 | set_buffer_uptodate(bh); | |
2080 | } else { | |
2081 | if (!buffer_eopnotsupp(bh) && printk_ratelimit()) { | |
2082 | printk(KERN_WARNING "lost page write due to " | |
2083 | "I/O error on %s\n", | |
2084 | bdevname(bh->b_bdev, b)); | |
2085 | } | |
1259ab75 CM |
2086 | /* note, we dont' set_buffer_write_io_error because we have |
2087 | * our own ways of dealing with the IO errors | |
2088 | */ | |
f2984462 CM |
2089 | clear_buffer_uptodate(bh); |
2090 | } | |
2091 | unlock_buffer(bh); | |
2092 | put_bh(bh); | |
2093 | } | |
2094 | ||
a512bbf8 YZ |
2095 | struct buffer_head *btrfs_read_dev_super(struct block_device *bdev) |
2096 | { | |
2097 | struct buffer_head *bh; | |
2098 | struct buffer_head *latest = NULL; | |
2099 | struct btrfs_super_block *super; | |
2100 | int i; | |
2101 | u64 transid = 0; | |
2102 | u64 bytenr; | |
2103 | ||
2104 | /* we would like to check all the supers, but that would make | |
2105 | * a btrfs mount succeed after a mkfs from a different FS. | |
2106 | * So, we need to add a special mount option to scan for | |
2107 | * later supers, using BTRFS_SUPER_MIRROR_MAX instead | |
2108 | */ | |
2109 | for (i = 0; i < 1; i++) { | |
2110 | bytenr = btrfs_sb_offset(i); | |
2111 | if (bytenr + 4096 >= i_size_read(bdev->bd_inode)) | |
2112 | break; | |
2113 | bh = __bread(bdev, bytenr / 4096, 4096); | |
2114 | if (!bh) | |
2115 | continue; | |
2116 | ||
2117 | super = (struct btrfs_super_block *)bh->b_data; | |
2118 | if (btrfs_super_bytenr(super) != bytenr || | |
2119 | strncmp((char *)(&super->magic), BTRFS_MAGIC, | |
2120 | sizeof(super->magic))) { | |
2121 | brelse(bh); | |
2122 | continue; | |
2123 | } | |
2124 | ||
2125 | if (!latest || btrfs_super_generation(super) > transid) { | |
2126 | brelse(latest); | |
2127 | latest = bh; | |
2128 | transid = btrfs_super_generation(super); | |
2129 | } else { | |
2130 | brelse(bh); | |
2131 | } | |
2132 | } | |
2133 | return latest; | |
2134 | } | |
2135 | ||
4eedeb75 HH |
2136 | /* |
2137 | * this should be called twice, once with wait == 0 and | |
2138 | * once with wait == 1. When wait == 0 is done, all the buffer heads | |
2139 | * we write are pinned. | |
2140 | * | |
2141 | * They are released when wait == 1 is done. | |
2142 | * max_mirrors must be the same for both runs, and it indicates how | |
2143 | * many supers on this one device should be written. | |
2144 | * | |
2145 | * max_mirrors == 0 means to write them all. | |
2146 | */ | |
a512bbf8 YZ |
2147 | static int write_dev_supers(struct btrfs_device *device, |
2148 | struct btrfs_super_block *sb, | |
2149 | int do_barriers, int wait, int max_mirrors) | |
2150 | { | |
2151 | struct buffer_head *bh; | |
2152 | int i; | |
2153 | int ret; | |
2154 | int errors = 0; | |
2155 | u32 crc; | |
2156 | u64 bytenr; | |
2157 | int last_barrier = 0; | |
2158 | ||
2159 | if (max_mirrors == 0) | |
2160 | max_mirrors = BTRFS_SUPER_MIRROR_MAX; | |
2161 | ||
2162 | /* make sure only the last submit_bh does a barrier */ | |
2163 | if (do_barriers) { | |
2164 | for (i = 0; i < max_mirrors; i++) { | |
2165 | bytenr = btrfs_sb_offset(i); | |
2166 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= | |
2167 | device->total_bytes) | |
2168 | break; | |
2169 | last_barrier = i; | |
2170 | } | |
2171 | } | |
2172 | ||
2173 | for (i = 0; i < max_mirrors; i++) { | |
2174 | bytenr = btrfs_sb_offset(i); | |
2175 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes) | |
2176 | break; | |
2177 | ||
2178 | if (wait) { | |
2179 | bh = __find_get_block(device->bdev, bytenr / 4096, | |
2180 | BTRFS_SUPER_INFO_SIZE); | |
2181 | BUG_ON(!bh); | |
a512bbf8 | 2182 | wait_on_buffer(bh); |
4eedeb75 HH |
2183 | if (!buffer_uptodate(bh)) |
2184 | errors++; | |
2185 | ||
2186 | /* drop our reference */ | |
2187 | brelse(bh); | |
2188 | ||
2189 | /* drop the reference from the wait == 0 run */ | |
2190 | brelse(bh); | |
2191 | continue; | |
a512bbf8 YZ |
2192 | } else { |
2193 | btrfs_set_super_bytenr(sb, bytenr); | |
2194 | ||
2195 | crc = ~(u32)0; | |
2196 | crc = btrfs_csum_data(NULL, (char *)sb + | |
2197 | BTRFS_CSUM_SIZE, crc, | |
2198 | BTRFS_SUPER_INFO_SIZE - | |
2199 | BTRFS_CSUM_SIZE); | |
2200 | btrfs_csum_final(crc, sb->csum); | |
2201 | ||
4eedeb75 HH |
2202 | /* |
2203 | * one reference for us, and we leave it for the | |
2204 | * caller | |
2205 | */ | |
a512bbf8 YZ |
2206 | bh = __getblk(device->bdev, bytenr / 4096, |
2207 | BTRFS_SUPER_INFO_SIZE); | |
2208 | memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); | |
2209 | ||
4eedeb75 | 2210 | /* one reference for submit_bh */ |
a512bbf8 | 2211 | get_bh(bh); |
4eedeb75 HH |
2212 | |
2213 | set_buffer_uptodate(bh); | |
a512bbf8 YZ |
2214 | lock_buffer(bh); |
2215 | bh->b_end_io = btrfs_end_buffer_write_sync; | |
2216 | } | |
2217 | ||
2218 | if (i == last_barrier && do_barriers && device->barriers) { | |
2219 | ret = submit_bh(WRITE_BARRIER, bh); | |
2220 | if (ret == -EOPNOTSUPP) { | |
2221 | printk("btrfs: disabling barriers on dev %s\n", | |
2222 | device->name); | |
2223 | set_buffer_uptodate(bh); | |
2224 | device->barriers = 0; | |
4eedeb75 | 2225 | /* one reference for submit_bh */ |
a512bbf8 YZ |
2226 | get_bh(bh); |
2227 | lock_buffer(bh); | |
ffbd517d | 2228 | ret = submit_bh(WRITE_SYNC, bh); |
a512bbf8 YZ |
2229 | } |
2230 | } else { | |
ffbd517d | 2231 | ret = submit_bh(WRITE_SYNC, bh); |
a512bbf8 YZ |
2232 | } |
2233 | ||
4eedeb75 | 2234 | if (ret) |
a512bbf8 | 2235 | errors++; |
a512bbf8 YZ |
2236 | } |
2237 | return errors < i ? 0 : -1; | |
2238 | } | |
2239 | ||
2240 | int write_all_supers(struct btrfs_root *root, int max_mirrors) | |
f2984462 | 2241 | { |
e5e9a520 | 2242 | struct list_head *head; |
f2984462 | 2243 | struct btrfs_device *dev; |
a061fc8d | 2244 | struct btrfs_super_block *sb; |
f2984462 | 2245 | struct btrfs_dev_item *dev_item; |
f2984462 CM |
2246 | int ret; |
2247 | int do_barriers; | |
a236aed1 CM |
2248 | int max_errors; |
2249 | int total_errors = 0; | |
a061fc8d | 2250 | u64 flags; |
f2984462 | 2251 | |
a236aed1 | 2252 | max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; |
f2984462 CM |
2253 | do_barriers = !btrfs_test_opt(root, NOBARRIER); |
2254 | ||
a061fc8d CM |
2255 | sb = &root->fs_info->super_for_commit; |
2256 | dev_item = &sb->dev_item; | |
e5e9a520 CM |
2257 | |
2258 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
2259 | head = &root->fs_info->fs_devices->devices; | |
c6e30871 | 2260 | list_for_each_entry(dev, head, dev_list) { |
dfe25020 CM |
2261 | if (!dev->bdev) { |
2262 | total_errors++; | |
2263 | continue; | |
2264 | } | |
2b82032c | 2265 | if (!dev->in_fs_metadata || !dev->writeable) |
dfe25020 CM |
2266 | continue; |
2267 | ||
2b82032c | 2268 | btrfs_set_stack_device_generation(dev_item, 0); |
a061fc8d CM |
2269 | btrfs_set_stack_device_type(dev_item, dev->type); |
2270 | btrfs_set_stack_device_id(dev_item, dev->devid); | |
2271 | btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); | |
2272 | btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); | |
2273 | btrfs_set_stack_device_io_align(dev_item, dev->io_align); | |
2274 | btrfs_set_stack_device_io_width(dev_item, dev->io_width); | |
2275 | btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); | |
2276 | memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); | |
2b82032c | 2277 | memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); |
a512bbf8 | 2278 | |
a061fc8d CM |
2279 | flags = btrfs_super_flags(sb); |
2280 | btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); | |
2281 | ||
a512bbf8 | 2282 | ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors); |
a236aed1 CM |
2283 | if (ret) |
2284 | total_errors++; | |
f2984462 | 2285 | } |
a236aed1 | 2286 | if (total_errors > max_errors) { |
d397712b CM |
2287 | printk(KERN_ERR "btrfs: %d errors while writing supers\n", |
2288 | total_errors); | |
a236aed1 CM |
2289 | BUG(); |
2290 | } | |
f2984462 | 2291 | |
a512bbf8 | 2292 | total_errors = 0; |
c6e30871 | 2293 | list_for_each_entry(dev, head, dev_list) { |
dfe25020 CM |
2294 | if (!dev->bdev) |
2295 | continue; | |
2b82032c | 2296 | if (!dev->in_fs_metadata || !dev->writeable) |
dfe25020 CM |
2297 | continue; |
2298 | ||
a512bbf8 YZ |
2299 | ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors); |
2300 | if (ret) | |
2301 | total_errors++; | |
f2984462 | 2302 | } |
e5e9a520 | 2303 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
a236aed1 | 2304 | if (total_errors > max_errors) { |
d397712b CM |
2305 | printk(KERN_ERR "btrfs: %d errors while writing supers\n", |
2306 | total_errors); | |
a236aed1 CM |
2307 | BUG(); |
2308 | } | |
f2984462 CM |
2309 | return 0; |
2310 | } | |
2311 | ||
a512bbf8 YZ |
2312 | int write_ctree_super(struct btrfs_trans_handle *trans, |
2313 | struct btrfs_root *root, int max_mirrors) | |
eb60ceac | 2314 | { |
e66f709b | 2315 | int ret; |
5f39d397 | 2316 | |
a512bbf8 | 2317 | ret = write_all_supers(root, max_mirrors); |
5f39d397 | 2318 | return ret; |
cfaa7295 CM |
2319 | } |
2320 | ||
5eda7b5e | 2321 | int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) |
2619ba1f | 2322 | { |
4df27c4d | 2323 | spin_lock(&fs_info->fs_roots_radix_lock); |
2619ba1f CM |
2324 | radix_tree_delete(&fs_info->fs_roots_radix, |
2325 | (unsigned long)root->root_key.objectid); | |
4df27c4d | 2326 | spin_unlock(&fs_info->fs_roots_radix_lock); |
76dda93c YZ |
2327 | |
2328 | if (btrfs_root_refs(&root->root_item) == 0) | |
2329 | synchronize_srcu(&fs_info->subvol_srcu); | |
2330 | ||
4df27c4d YZ |
2331 | free_fs_root(root); |
2332 | return 0; | |
2333 | } | |
2334 | ||
2335 | static void free_fs_root(struct btrfs_root *root) | |
2336 | { | |
2337 | WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree)); | |
3394e160 CM |
2338 | if (root->anon_super.s_dev) { |
2339 | down_write(&root->anon_super.s_umount); | |
2340 | kill_anon_super(&root->anon_super); | |
2341 | } | |
4df27c4d YZ |
2342 | free_extent_buffer(root->node); |
2343 | free_extent_buffer(root->commit_root); | |
d397712b | 2344 | kfree(root->name); |
2619ba1f | 2345 | kfree(root); |
2619ba1f CM |
2346 | } |
2347 | ||
35b7e476 | 2348 | static int del_fs_roots(struct btrfs_fs_info *fs_info) |
0f7d52f4 CM |
2349 | { |
2350 | int ret; | |
2351 | struct btrfs_root *gang[8]; | |
2352 | int i; | |
2353 | ||
76dda93c YZ |
2354 | while (!list_empty(&fs_info->dead_roots)) { |
2355 | gang[0] = list_entry(fs_info->dead_roots.next, | |
2356 | struct btrfs_root, root_list); | |
2357 | list_del(&gang[0]->root_list); | |
2358 | ||
2359 | if (gang[0]->in_radix) { | |
2360 | btrfs_free_fs_root(fs_info, gang[0]); | |
2361 | } else { | |
2362 | free_extent_buffer(gang[0]->node); | |
2363 | free_extent_buffer(gang[0]->commit_root); | |
2364 | kfree(gang[0]); | |
2365 | } | |
2366 | } | |
2367 | ||
d397712b | 2368 | while (1) { |
0f7d52f4 CM |
2369 | ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, |
2370 | (void **)gang, 0, | |
2371 | ARRAY_SIZE(gang)); | |
2372 | if (!ret) | |
2373 | break; | |
2619ba1f | 2374 | for (i = 0; i < ret; i++) |
5eda7b5e | 2375 | btrfs_free_fs_root(fs_info, gang[i]); |
0f7d52f4 CM |
2376 | } |
2377 | return 0; | |
2378 | } | |
b4100d64 | 2379 | |
c146afad | 2380 | int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) |
cfaa7295 | 2381 | { |
c146afad YZ |
2382 | u64 root_objectid = 0; |
2383 | struct btrfs_root *gang[8]; | |
2384 | int i; | |
3768f368 | 2385 | int ret; |
e089f05c | 2386 | |
c146afad YZ |
2387 | while (1) { |
2388 | ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, | |
2389 | (void **)gang, root_objectid, | |
2390 | ARRAY_SIZE(gang)); | |
2391 | if (!ret) | |
2392 | break; | |
5d4f98a2 YZ |
2393 | |
2394 | root_objectid = gang[ret - 1]->root_key.objectid + 1; | |
c146afad YZ |
2395 | for (i = 0; i < ret; i++) { |
2396 | root_objectid = gang[i]->root_key.objectid; | |
c146afad YZ |
2397 | btrfs_orphan_cleanup(gang[i]); |
2398 | } | |
2399 | root_objectid++; | |
2400 | } | |
2401 | return 0; | |
2402 | } | |
a2135011 | 2403 | |
c146afad YZ |
2404 | int btrfs_commit_super(struct btrfs_root *root) |
2405 | { | |
2406 | struct btrfs_trans_handle *trans; | |
2407 | int ret; | |
a74a4b97 | 2408 | |
c146afad | 2409 | mutex_lock(&root->fs_info->cleaner_mutex); |
24bbcf04 | 2410 | btrfs_run_delayed_iputs(root); |
a74a4b97 | 2411 | btrfs_clean_old_snapshots(root); |
c146afad | 2412 | mutex_unlock(&root->fs_info->cleaner_mutex); |
c71bf099 YZ |
2413 | |
2414 | /* wait until ongoing cleanup work done */ | |
2415 | down_write(&root->fs_info->cleanup_work_sem); | |
2416 | up_write(&root->fs_info->cleanup_work_sem); | |
2417 | ||
79154b1b | 2418 | trans = btrfs_start_transaction(root, 1); |
54aa1f4d | 2419 | ret = btrfs_commit_transaction(trans, root); |
c146afad YZ |
2420 | BUG_ON(ret); |
2421 | /* run commit again to drop the original snapshot */ | |
79154b1b CM |
2422 | trans = btrfs_start_transaction(root, 1); |
2423 | btrfs_commit_transaction(trans, root); | |
2424 | ret = btrfs_write_and_wait_transaction(NULL, root); | |
3768f368 | 2425 | BUG_ON(ret); |
d6bfde87 | 2426 | |
a512bbf8 | 2427 | ret = write_ctree_super(NULL, root, 0); |
c146afad YZ |
2428 | return ret; |
2429 | } | |
2430 | ||
2431 | int close_ctree(struct btrfs_root *root) | |
2432 | { | |
2433 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2434 | int ret; | |
2435 | ||
2436 | fs_info->closing = 1; | |
2437 | smp_mb(); | |
2438 | ||
2439 | kthread_stop(root->fs_info->transaction_kthread); | |
2440 | kthread_stop(root->fs_info->cleaner_kthread); | |
2441 | ||
2442 | if (!(fs_info->sb->s_flags & MS_RDONLY)) { | |
2443 | ret = btrfs_commit_super(root); | |
d397712b CM |
2444 | if (ret) |
2445 | printk(KERN_ERR "btrfs: commit super ret %d\n", ret); | |
c146afad | 2446 | } |
0f7d52f4 | 2447 | |
f25784b3 YZ |
2448 | fs_info->closing = 2; |
2449 | smp_mb(); | |
2450 | ||
b0c68f8b | 2451 | if (fs_info->delalloc_bytes) { |
d397712b | 2452 | printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n", |
21380931 | 2453 | (unsigned long long)fs_info->delalloc_bytes); |
b0c68f8b | 2454 | } |
31153d81 | 2455 | if (fs_info->total_ref_cache_size) { |
d397712b CM |
2456 | printk(KERN_INFO "btrfs: at umount reference cache size %llu\n", |
2457 | (unsigned long long)fs_info->total_ref_cache_size); | |
31153d81 | 2458 | } |
bcc63abb | 2459 | |
5d4f98a2 YZ |
2460 | free_extent_buffer(fs_info->extent_root->node); |
2461 | free_extent_buffer(fs_info->extent_root->commit_root); | |
2462 | free_extent_buffer(fs_info->tree_root->node); | |
2463 | free_extent_buffer(fs_info->tree_root->commit_root); | |
2464 | free_extent_buffer(root->fs_info->chunk_root->node); | |
2465 | free_extent_buffer(root->fs_info->chunk_root->commit_root); | |
2466 | free_extent_buffer(root->fs_info->dev_root->node); | |
2467 | free_extent_buffer(root->fs_info->dev_root->commit_root); | |
2468 | free_extent_buffer(root->fs_info->csum_root->node); | |
2469 | free_extent_buffer(root->fs_info->csum_root->commit_root); | |
d20f7043 | 2470 | |
9078a3e1 | 2471 | btrfs_free_block_groups(root->fs_info); |
d10c5f31 | 2472 | |
c146afad | 2473 | del_fs_roots(fs_info); |
d10c5f31 | 2474 | |
c146afad | 2475 | iput(fs_info->btree_inode); |
9ad6b7bc | 2476 | |
61d92c32 | 2477 | btrfs_stop_workers(&fs_info->generic_worker); |
247e743c | 2478 | btrfs_stop_workers(&fs_info->fixup_workers); |
771ed689 | 2479 | btrfs_stop_workers(&fs_info->delalloc_workers); |
8b712842 CM |
2480 | btrfs_stop_workers(&fs_info->workers); |
2481 | btrfs_stop_workers(&fs_info->endio_workers); | |
d20f7043 | 2482 | btrfs_stop_workers(&fs_info->endio_meta_workers); |
cad321ad | 2483 | btrfs_stop_workers(&fs_info->endio_meta_write_workers); |
e6dcd2dc | 2484 | btrfs_stop_workers(&fs_info->endio_write_workers); |
1cc127b5 | 2485 | btrfs_stop_workers(&fs_info->submit_workers); |
e3ccfa98 | 2486 | btrfs_stop_workers(&fs_info->enospc_workers); |
d6bfde87 | 2487 | |
dfe25020 | 2488 | btrfs_close_devices(fs_info->fs_devices); |
0b86a832 | 2489 | btrfs_mapping_tree_free(&fs_info->mapping_tree); |
b248a415 | 2490 | |
04160088 | 2491 | bdi_destroy(&fs_info->bdi); |
76dda93c | 2492 | cleanup_srcu_struct(&fs_info->subvol_srcu); |
0b86a832 | 2493 | |
0f7d52f4 | 2494 | kfree(fs_info->extent_root); |
0f7d52f4 | 2495 | kfree(fs_info->tree_root); |
0b86a832 CM |
2496 | kfree(fs_info->chunk_root); |
2497 | kfree(fs_info->dev_root); | |
d20f7043 | 2498 | kfree(fs_info->csum_root); |
eb60ceac CM |
2499 | return 0; |
2500 | } | |
2501 | ||
1259ab75 | 2502 | int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) |
5f39d397 | 2503 | { |
1259ab75 | 2504 | int ret; |
810191ff | 2505 | struct inode *btree_inode = buf->first_page->mapping->host; |
1259ab75 | 2506 | |
2ac55d41 JB |
2507 | ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf, |
2508 | NULL); | |
1259ab75 CM |
2509 | if (!ret) |
2510 | return ret; | |
2511 | ||
2512 | ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, | |
2513 | parent_transid); | |
2514 | return !ret; | |
5f39d397 CM |
2515 | } |
2516 | ||
2517 | int btrfs_set_buffer_uptodate(struct extent_buffer *buf) | |
ccd467d6 | 2518 | { |
810191ff | 2519 | struct inode *btree_inode = buf->first_page->mapping->host; |
d1310b2e | 2520 | return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, |
5f39d397 CM |
2521 | buf); |
2522 | } | |
6702ed49 | 2523 | |
5f39d397 CM |
2524 | void btrfs_mark_buffer_dirty(struct extent_buffer *buf) |
2525 | { | |
810191ff | 2526 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
5f39d397 CM |
2527 | u64 transid = btrfs_header_generation(buf); |
2528 | struct inode *btree_inode = root->fs_info->btree_inode; | |
b9473439 | 2529 | int was_dirty; |
b4ce94de | 2530 | |
b9447ef8 | 2531 | btrfs_assert_tree_locked(buf); |
ccd467d6 | 2532 | if (transid != root->fs_info->generation) { |
d397712b CM |
2533 | printk(KERN_CRIT "btrfs transid mismatch buffer %llu, " |
2534 | "found %llu running %llu\n", | |
db94535d | 2535 | (unsigned long long)buf->start, |
d397712b CM |
2536 | (unsigned long long)transid, |
2537 | (unsigned long long)root->fs_info->generation); | |
ccd467d6 CM |
2538 | WARN_ON(1); |
2539 | } | |
b9473439 CM |
2540 | was_dirty = set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, |
2541 | buf); | |
2542 | if (!was_dirty) { | |
2543 | spin_lock(&root->fs_info->delalloc_lock); | |
2544 | root->fs_info->dirty_metadata_bytes += buf->len; | |
2545 | spin_unlock(&root->fs_info->delalloc_lock); | |
2546 | } | |
eb60ceac CM |
2547 | } |
2548 | ||
d3c2fdcf | 2549 | void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) |
35b7e476 | 2550 | { |
188de649 CM |
2551 | /* |
2552 | * looks as though older kernels can get into trouble with | |
2553 | * this code, they end up stuck in balance_dirty_pages forever | |
2554 | */ | |
d6bfde87 | 2555 | u64 num_dirty; |
771ed689 | 2556 | unsigned long thresh = 32 * 1024 * 1024; |
d6bfde87 | 2557 | |
6933c02e | 2558 | if (current->flags & PF_MEMALLOC) |
d6bfde87 CM |
2559 | return; |
2560 | ||
585ad2c3 CM |
2561 | num_dirty = root->fs_info->dirty_metadata_bytes; |
2562 | ||
d6bfde87 CM |
2563 | if (num_dirty > thresh) { |
2564 | balance_dirty_pages_ratelimited_nr( | |
d7fc640e | 2565 | root->fs_info->btree_inode->i_mapping, 1); |
d6bfde87 | 2566 | } |
188de649 | 2567 | return; |
35b7e476 | 2568 | } |
6b80053d | 2569 | |
ca7a79ad | 2570 | int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) |
6b80053d | 2571 | { |
810191ff | 2572 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
ce9adaa5 | 2573 | int ret; |
ca7a79ad | 2574 | ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); |
d397712b | 2575 | if (ret == 0) |
b4ce94de | 2576 | set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); |
ce9adaa5 | 2577 | return ret; |
6b80053d | 2578 | } |
0da5468f | 2579 | |
4bef0848 CM |
2580 | int btree_lock_page_hook(struct page *page) |
2581 | { | |
2582 | struct inode *inode = page->mapping->host; | |
b9473439 | 2583 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4bef0848 CM |
2584 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2585 | struct extent_buffer *eb; | |
2586 | unsigned long len; | |
2587 | u64 bytenr = page_offset(page); | |
2588 | ||
2589 | if (page->private == EXTENT_PAGE_PRIVATE) | |
2590 | goto out; | |
2591 | ||
2592 | len = page->private >> 2; | |
2593 | eb = find_extent_buffer(io_tree, bytenr, len, GFP_NOFS); | |
2594 | if (!eb) | |
2595 | goto out; | |
2596 | ||
2597 | btrfs_tree_lock(eb); | |
4bef0848 | 2598 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
b9473439 CM |
2599 | |
2600 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { | |
2601 | spin_lock(&root->fs_info->delalloc_lock); | |
2602 | if (root->fs_info->dirty_metadata_bytes >= eb->len) | |
2603 | root->fs_info->dirty_metadata_bytes -= eb->len; | |
2604 | else | |
2605 | WARN_ON(1); | |
2606 | spin_unlock(&root->fs_info->delalloc_lock); | |
2607 | } | |
2608 | ||
4bef0848 CM |
2609 | btrfs_tree_unlock(eb); |
2610 | free_extent_buffer(eb); | |
2611 | out: | |
2612 | lock_page(page); | |
2613 | return 0; | |
2614 | } | |
2615 | ||
d1310b2e | 2616 | static struct extent_io_ops btree_extent_io_ops = { |
4bef0848 | 2617 | .write_cache_pages_lock_hook = btree_lock_page_hook, |
ce9adaa5 | 2618 | .readpage_end_io_hook = btree_readpage_end_io_hook, |
0b86a832 | 2619 | .submit_bio_hook = btree_submit_bio_hook, |
239b14b3 CM |
2620 | /* note we're sharing with inode.c for the merge bio hook */ |
2621 | .merge_bio_hook = btrfs_merge_bio_hook, | |
0da5468f | 2622 | }; |