Commit | Line | Data |
---|---|---|
6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
e20d96d6 | 19 | #include <linux/fs.h> |
d98237b3 | 20 | #include <linux/blkdev.h> |
87cbda5c | 21 | #include <linux/scatterlist.h> |
22b0ebda | 22 | #include <linux/swap.h> |
0f7d52f4 | 23 | #include <linux/radix-tree.h> |
35b7e476 | 24 | #include <linux/writeback.h> |
d397712b | 25 | #include <linux/buffer_head.h> |
ce9adaa5 | 26 | #include <linux/workqueue.h> |
a74a4b97 | 27 | #include <linux/kthread.h> |
4b4e25f2 | 28 | #include <linux/freezer.h> |
163e783e | 29 | #include <linux/crc32c.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
784b4e29 | 31 | #include <linux/migrate.h> |
4b4e25f2 | 32 | #include "compat.h" |
eb60ceac CM |
33 | #include "ctree.h" |
34 | #include "disk-io.h" | |
e089f05c | 35 | #include "transaction.h" |
0f7d52f4 | 36 | #include "btrfs_inode.h" |
0b86a832 | 37 | #include "volumes.h" |
db94535d | 38 | #include "print-tree.h" |
8b712842 | 39 | #include "async-thread.h" |
925baedd | 40 | #include "locking.h" |
e02119d5 | 41 | #include "tree-log.h" |
fa9c0d79 | 42 | #include "free-space-cache.h" |
eb60ceac | 43 | |
d1310b2e | 44 | static struct extent_io_ops btree_extent_io_ops; |
8b712842 | 45 | static void end_workqueue_fn(struct btrfs_work *work); |
4df27c4d | 46 | static void free_fs_root(struct btrfs_root *root); |
ce9adaa5 | 47 | |
d352ac68 CM |
48 | /* |
49 | * end_io_wq structs are used to do processing in task context when an IO is | |
50 | * complete. This is used during reads to verify checksums, and it is used | |
51 | * by writes to insert metadata for new file extents after IO is complete. | |
52 | */ | |
ce9adaa5 CM |
53 | struct end_io_wq { |
54 | struct bio *bio; | |
55 | bio_end_io_t *end_io; | |
56 | void *private; | |
57 | struct btrfs_fs_info *info; | |
58 | int error; | |
22c59948 | 59 | int metadata; |
ce9adaa5 | 60 | struct list_head list; |
8b712842 | 61 | struct btrfs_work work; |
ce9adaa5 | 62 | }; |
0da5468f | 63 | |
d352ac68 CM |
64 | /* |
65 | * async submit bios are used to offload expensive checksumming | |
66 | * onto the worker threads. They checksum file and metadata bios | |
67 | * just before they are sent down the IO stack. | |
68 | */ | |
44b8bd7e CM |
69 | struct async_submit_bio { |
70 | struct inode *inode; | |
71 | struct bio *bio; | |
72 | struct list_head list; | |
4a69a410 CM |
73 | extent_submit_bio_hook_t *submit_bio_start; |
74 | extent_submit_bio_hook_t *submit_bio_done; | |
44b8bd7e CM |
75 | int rw; |
76 | int mirror_num; | |
c8b97818 | 77 | unsigned long bio_flags; |
eaf25d93 CM |
78 | /* |
79 | * bio_offset is optional, can be used if the pages in the bio | |
80 | * can't tell us where in the file the bio should go | |
81 | */ | |
82 | u64 bio_offset; | |
8b712842 | 83 | struct btrfs_work work; |
44b8bd7e CM |
84 | }; |
85 | ||
4008c04a CM |
86 | /* These are used to set the lockdep class on the extent buffer locks. |
87 | * The class is set by the readpage_end_io_hook after the buffer has | |
88 | * passed csum validation but before the pages are unlocked. | |
89 | * | |
90 | * The lockdep class is also set by btrfs_init_new_buffer on freshly | |
91 | * allocated blocks. | |
92 | * | |
93 | * The class is based on the level in the tree block, which allows lockdep | |
94 | * to know that lower nodes nest inside the locks of higher nodes. | |
95 | * | |
96 | * We also add a check to make sure the highest level of the tree is | |
97 | * the same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this | |
98 | * code needs update as well. | |
99 | */ | |
100 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
101 | # if BTRFS_MAX_LEVEL != 8 | |
102 | # error | |
103 | # endif | |
104 | static struct lock_class_key btrfs_eb_class[BTRFS_MAX_LEVEL + 1]; | |
105 | static const char *btrfs_eb_name[BTRFS_MAX_LEVEL + 1] = { | |
106 | /* leaf */ | |
107 | "btrfs-extent-00", | |
108 | "btrfs-extent-01", | |
109 | "btrfs-extent-02", | |
110 | "btrfs-extent-03", | |
111 | "btrfs-extent-04", | |
112 | "btrfs-extent-05", | |
113 | "btrfs-extent-06", | |
114 | "btrfs-extent-07", | |
115 | /* highest possible level */ | |
116 | "btrfs-extent-08", | |
117 | }; | |
118 | #endif | |
119 | ||
d352ac68 CM |
120 | /* |
121 | * extents on the btree inode are pretty simple, there's one extent | |
122 | * that covers the entire device | |
123 | */ | |
b2950863 CH |
124 | static struct extent_map *btree_get_extent(struct inode *inode, |
125 | struct page *page, size_t page_offset, u64 start, u64 len, | |
126 | int create) | |
7eccb903 | 127 | { |
5f39d397 CM |
128 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
129 | struct extent_map *em; | |
130 | int ret; | |
131 | ||
890871be | 132 | read_lock(&em_tree->lock); |
d1310b2e | 133 | em = lookup_extent_mapping(em_tree, start, len); |
a061fc8d CM |
134 | if (em) { |
135 | em->bdev = | |
136 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; | |
890871be | 137 | read_unlock(&em_tree->lock); |
5f39d397 | 138 | goto out; |
a061fc8d | 139 | } |
890871be | 140 | read_unlock(&em_tree->lock); |
7b13b7b1 | 141 | |
5f39d397 CM |
142 | em = alloc_extent_map(GFP_NOFS); |
143 | if (!em) { | |
144 | em = ERR_PTR(-ENOMEM); | |
145 | goto out; | |
146 | } | |
147 | em->start = 0; | |
0afbaf8c | 148 | em->len = (u64)-1; |
c8b97818 | 149 | em->block_len = (u64)-1; |
5f39d397 | 150 | em->block_start = 0; |
a061fc8d | 151 | em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; |
d1310b2e | 152 | |
890871be | 153 | write_lock(&em_tree->lock); |
5f39d397 CM |
154 | ret = add_extent_mapping(em_tree, em); |
155 | if (ret == -EEXIST) { | |
0afbaf8c CM |
156 | u64 failed_start = em->start; |
157 | u64 failed_len = em->len; | |
158 | ||
5f39d397 | 159 | free_extent_map(em); |
7b13b7b1 | 160 | em = lookup_extent_mapping(em_tree, start, len); |
0afbaf8c | 161 | if (em) { |
7b13b7b1 | 162 | ret = 0; |
0afbaf8c CM |
163 | } else { |
164 | em = lookup_extent_mapping(em_tree, failed_start, | |
165 | failed_len); | |
7b13b7b1 | 166 | ret = -EIO; |
0afbaf8c | 167 | } |
5f39d397 | 168 | } else if (ret) { |
7b13b7b1 CM |
169 | free_extent_map(em); |
170 | em = NULL; | |
5f39d397 | 171 | } |
890871be | 172 | write_unlock(&em_tree->lock); |
7b13b7b1 CM |
173 | |
174 | if (ret) | |
175 | em = ERR_PTR(ret); | |
5f39d397 CM |
176 | out: |
177 | return em; | |
7eccb903 CM |
178 | } |
179 | ||
19c00ddc CM |
180 | u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len) |
181 | { | |
163e783e | 182 | return crc32c(seed, data, len); |
19c00ddc CM |
183 | } |
184 | ||
185 | void btrfs_csum_final(u32 crc, char *result) | |
186 | { | |
187 | *(__le32 *)result = ~cpu_to_le32(crc); | |
188 | } | |
189 | ||
d352ac68 CM |
190 | /* |
191 | * compute the csum for a btree block, and either verify it or write it | |
192 | * into the csum field of the block. | |
193 | */ | |
19c00ddc CM |
194 | static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, |
195 | int verify) | |
196 | { | |
607d432d JB |
197 | u16 csum_size = |
198 | btrfs_super_csum_size(&root->fs_info->super_copy); | |
199 | char *result = NULL; | |
19c00ddc CM |
200 | unsigned long len; |
201 | unsigned long cur_len; | |
202 | unsigned long offset = BTRFS_CSUM_SIZE; | |
203 | char *map_token = NULL; | |
204 | char *kaddr; | |
205 | unsigned long map_start; | |
206 | unsigned long map_len; | |
207 | int err; | |
208 | u32 crc = ~(u32)0; | |
607d432d | 209 | unsigned long inline_result; |
19c00ddc CM |
210 | |
211 | len = buf->len - offset; | |
d397712b | 212 | while (len > 0) { |
19c00ddc CM |
213 | err = map_private_extent_buffer(buf, offset, 32, |
214 | &map_token, &kaddr, | |
215 | &map_start, &map_len, KM_USER0); | |
d397712b | 216 | if (err) |
19c00ddc | 217 | return 1; |
19c00ddc CM |
218 | cur_len = min(len, map_len - (offset - map_start)); |
219 | crc = btrfs_csum_data(root, kaddr + offset - map_start, | |
220 | crc, cur_len); | |
221 | len -= cur_len; | |
222 | offset += cur_len; | |
223 | unmap_extent_buffer(buf, map_token, KM_USER0); | |
224 | } | |
607d432d JB |
225 | if (csum_size > sizeof(inline_result)) { |
226 | result = kzalloc(csum_size * sizeof(char), GFP_NOFS); | |
227 | if (!result) | |
228 | return 1; | |
229 | } else { | |
230 | result = (char *)&inline_result; | |
231 | } | |
232 | ||
19c00ddc CM |
233 | btrfs_csum_final(crc, result); |
234 | ||
235 | if (verify) { | |
607d432d | 236 | if (memcmp_extent_buffer(buf, result, 0, csum_size)) { |
e4204ded CM |
237 | u32 val; |
238 | u32 found = 0; | |
607d432d | 239 | memcpy(&found, result, csum_size); |
e4204ded | 240 | |
607d432d | 241 | read_extent_buffer(buf, &val, 0, csum_size); |
193f284d CM |
242 | if (printk_ratelimit()) { |
243 | printk(KERN_INFO "btrfs: %s checksum verify " | |
244 | "failed on %llu wanted %X found %X " | |
245 | "level %d\n", | |
246 | root->fs_info->sb->s_id, | |
247 | (unsigned long long)buf->start, val, found, | |
248 | btrfs_header_level(buf)); | |
249 | } | |
607d432d JB |
250 | if (result != (char *)&inline_result) |
251 | kfree(result); | |
19c00ddc CM |
252 | return 1; |
253 | } | |
254 | } else { | |
607d432d | 255 | write_extent_buffer(buf, result, 0, csum_size); |
19c00ddc | 256 | } |
607d432d JB |
257 | if (result != (char *)&inline_result) |
258 | kfree(result); | |
19c00ddc CM |
259 | return 0; |
260 | } | |
261 | ||
d352ac68 CM |
262 | /* |
263 | * we can't consider a given block up to date unless the transid of the | |
264 | * block matches the transid in the parent node's pointer. This is how we | |
265 | * detect blocks that either didn't get written at all or got written | |
266 | * in the wrong place. | |
267 | */ | |
1259ab75 CM |
268 | static int verify_parent_transid(struct extent_io_tree *io_tree, |
269 | struct extent_buffer *eb, u64 parent_transid) | |
270 | { | |
2ac55d41 | 271 | struct extent_state *cached_state = NULL; |
1259ab75 CM |
272 | int ret; |
273 | ||
274 | if (!parent_transid || btrfs_header_generation(eb) == parent_transid) | |
275 | return 0; | |
276 | ||
2ac55d41 JB |
277 | lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1, |
278 | 0, &cached_state, GFP_NOFS); | |
279 | if (extent_buffer_uptodate(io_tree, eb, cached_state) && | |
1259ab75 CM |
280 | btrfs_header_generation(eb) == parent_transid) { |
281 | ret = 0; | |
282 | goto out; | |
283 | } | |
193f284d CM |
284 | if (printk_ratelimit()) { |
285 | printk("parent transid verify failed on %llu wanted %llu " | |
286 | "found %llu\n", | |
287 | (unsigned long long)eb->start, | |
288 | (unsigned long long)parent_transid, | |
289 | (unsigned long long)btrfs_header_generation(eb)); | |
290 | } | |
1259ab75 | 291 | ret = 1; |
2ac55d41 | 292 | clear_extent_buffer_uptodate(io_tree, eb, &cached_state); |
33958dc6 | 293 | out: |
2ac55d41 JB |
294 | unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1, |
295 | &cached_state, GFP_NOFS); | |
1259ab75 | 296 | return ret; |
1259ab75 CM |
297 | } |
298 | ||
d352ac68 CM |
299 | /* |
300 | * helper to read a given tree block, doing retries as required when | |
301 | * the checksums don't match and we have alternate mirrors to try. | |
302 | */ | |
f188591e CM |
303 | static int btree_read_extent_buffer_pages(struct btrfs_root *root, |
304 | struct extent_buffer *eb, | |
ca7a79ad | 305 | u64 start, u64 parent_transid) |
f188591e CM |
306 | { |
307 | struct extent_io_tree *io_tree; | |
308 | int ret; | |
309 | int num_copies = 0; | |
310 | int mirror_num = 0; | |
311 | ||
312 | io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; | |
313 | while (1) { | |
314 | ret = read_extent_buffer_pages(io_tree, eb, start, 1, | |
315 | btree_get_extent, mirror_num); | |
1259ab75 CM |
316 | if (!ret && |
317 | !verify_parent_transid(io_tree, eb, parent_transid)) | |
f188591e | 318 | return ret; |
d397712b | 319 | |
f188591e CM |
320 | num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, |
321 | eb->start, eb->len); | |
4235298e | 322 | if (num_copies == 1) |
f188591e | 323 | return ret; |
4235298e | 324 | |
f188591e | 325 | mirror_num++; |
4235298e | 326 | if (mirror_num > num_copies) |
f188591e | 327 | return ret; |
f188591e | 328 | } |
f188591e CM |
329 | return -EIO; |
330 | } | |
19c00ddc | 331 | |
d352ac68 | 332 | /* |
d397712b CM |
333 | * checksum a dirty tree block before IO. This has extra checks to make sure |
334 | * we only fill in the checksum field in the first page of a multi-page block | |
d352ac68 | 335 | */ |
d397712b | 336 | |
b2950863 | 337 | static int csum_dirty_buffer(struct btrfs_root *root, struct page *page) |
19c00ddc | 338 | { |
d1310b2e | 339 | struct extent_io_tree *tree; |
35ebb934 | 340 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
19c00ddc | 341 | u64 found_start; |
19c00ddc CM |
342 | unsigned long len; |
343 | struct extent_buffer *eb; | |
f188591e CM |
344 | int ret; |
345 | ||
d1310b2e | 346 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
19c00ddc CM |
347 | |
348 | if (page->private == EXTENT_PAGE_PRIVATE) | |
349 | goto out; | |
350 | if (!page->private) | |
351 | goto out; | |
352 | len = page->private >> 2; | |
d397712b CM |
353 | WARN_ON(len == 0); |
354 | ||
19c00ddc | 355 | eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); |
91ca338d TI |
356 | if (eb == NULL) { |
357 | WARN_ON(1); | |
358 | goto out; | |
359 | } | |
ca7a79ad CM |
360 | ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE, |
361 | btrfs_header_generation(eb)); | |
f188591e | 362 | BUG_ON(ret); |
784b4e29 CM |
363 | WARN_ON(!btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN)); |
364 | ||
19c00ddc CM |
365 | found_start = btrfs_header_bytenr(eb); |
366 | if (found_start != start) { | |
55c69072 CM |
367 | WARN_ON(1); |
368 | goto err; | |
369 | } | |
370 | if (eb->first_page != page) { | |
55c69072 CM |
371 | WARN_ON(1); |
372 | goto err; | |
373 | } | |
374 | if (!PageUptodate(page)) { | |
55c69072 CM |
375 | WARN_ON(1); |
376 | goto err; | |
19c00ddc | 377 | } |
19c00ddc | 378 | csum_tree_block(root, eb, 0); |
55c69072 | 379 | err: |
19c00ddc CM |
380 | free_extent_buffer(eb); |
381 | out: | |
382 | return 0; | |
383 | } | |
384 | ||
2b82032c YZ |
385 | static int check_tree_block_fsid(struct btrfs_root *root, |
386 | struct extent_buffer *eb) | |
387 | { | |
388 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
389 | u8 fsid[BTRFS_UUID_SIZE]; | |
390 | int ret = 1; | |
391 | ||
392 | read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb), | |
393 | BTRFS_FSID_SIZE); | |
394 | while (fs_devices) { | |
395 | if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) { | |
396 | ret = 0; | |
397 | break; | |
398 | } | |
399 | fs_devices = fs_devices->seed; | |
400 | } | |
401 | return ret; | |
402 | } | |
403 | ||
4008c04a CM |
404 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
405 | void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, int level) | |
406 | { | |
407 | lockdep_set_class_and_name(&eb->lock, | |
408 | &btrfs_eb_class[level], | |
409 | btrfs_eb_name[level]); | |
410 | } | |
411 | #endif | |
412 | ||
b2950863 | 413 | static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
ce9adaa5 CM |
414 | struct extent_state *state) |
415 | { | |
416 | struct extent_io_tree *tree; | |
417 | u64 found_start; | |
418 | int found_level; | |
419 | unsigned long len; | |
420 | struct extent_buffer *eb; | |
421 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
f188591e | 422 | int ret = 0; |
ce9adaa5 CM |
423 | |
424 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
425 | if (page->private == EXTENT_PAGE_PRIVATE) | |
426 | goto out; | |
427 | if (!page->private) | |
428 | goto out; | |
d397712b | 429 | |
ce9adaa5 | 430 | len = page->private >> 2; |
d397712b CM |
431 | WARN_ON(len == 0); |
432 | ||
ce9adaa5 | 433 | eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); |
91ca338d TI |
434 | if (eb == NULL) { |
435 | ret = -EIO; | |
436 | goto out; | |
437 | } | |
f188591e | 438 | |
ce9adaa5 | 439 | found_start = btrfs_header_bytenr(eb); |
23a07867 | 440 | if (found_start != start) { |
193f284d CM |
441 | if (printk_ratelimit()) { |
442 | printk(KERN_INFO "btrfs bad tree block start " | |
443 | "%llu %llu\n", | |
444 | (unsigned long long)found_start, | |
445 | (unsigned long long)eb->start); | |
446 | } | |
f188591e | 447 | ret = -EIO; |
ce9adaa5 CM |
448 | goto err; |
449 | } | |
450 | if (eb->first_page != page) { | |
d397712b CM |
451 | printk(KERN_INFO "btrfs bad first page %lu %lu\n", |
452 | eb->first_page->index, page->index); | |
ce9adaa5 | 453 | WARN_ON(1); |
f188591e | 454 | ret = -EIO; |
ce9adaa5 CM |
455 | goto err; |
456 | } | |
2b82032c | 457 | if (check_tree_block_fsid(root, eb)) { |
193f284d CM |
458 | if (printk_ratelimit()) { |
459 | printk(KERN_INFO "btrfs bad fsid on block %llu\n", | |
460 | (unsigned long long)eb->start); | |
461 | } | |
1259ab75 CM |
462 | ret = -EIO; |
463 | goto err; | |
464 | } | |
ce9adaa5 CM |
465 | found_level = btrfs_header_level(eb); |
466 | ||
4008c04a CM |
467 | btrfs_set_buffer_lockdep_class(eb, found_level); |
468 | ||
ce9adaa5 | 469 | ret = csum_tree_block(root, eb, 1); |
f188591e CM |
470 | if (ret) |
471 | ret = -EIO; | |
ce9adaa5 CM |
472 | |
473 | end = min_t(u64, eb->len, PAGE_CACHE_SIZE); | |
474 | end = eb->start + end - 1; | |
ce9adaa5 CM |
475 | err: |
476 | free_extent_buffer(eb); | |
477 | out: | |
f188591e | 478 | return ret; |
ce9adaa5 CM |
479 | } |
480 | ||
ce9adaa5 | 481 | static void end_workqueue_bio(struct bio *bio, int err) |
ce9adaa5 CM |
482 | { |
483 | struct end_io_wq *end_io_wq = bio->bi_private; | |
484 | struct btrfs_fs_info *fs_info; | |
ce9adaa5 | 485 | |
ce9adaa5 | 486 | fs_info = end_io_wq->info; |
ce9adaa5 | 487 | end_io_wq->error = err; |
8b712842 CM |
488 | end_io_wq->work.func = end_workqueue_fn; |
489 | end_io_wq->work.flags = 0; | |
d20f7043 | 490 | |
7b6d91da | 491 | if (bio->bi_rw & REQ_WRITE) { |
0cb59c99 | 492 | if (end_io_wq->metadata == 1) |
cad321ad CM |
493 | btrfs_queue_worker(&fs_info->endio_meta_write_workers, |
494 | &end_io_wq->work); | |
0cb59c99 JB |
495 | else if (end_io_wq->metadata == 2) |
496 | btrfs_queue_worker(&fs_info->endio_freespace_worker, | |
497 | &end_io_wq->work); | |
cad321ad CM |
498 | else |
499 | btrfs_queue_worker(&fs_info->endio_write_workers, | |
500 | &end_io_wq->work); | |
d20f7043 CM |
501 | } else { |
502 | if (end_io_wq->metadata) | |
503 | btrfs_queue_worker(&fs_info->endio_meta_workers, | |
504 | &end_io_wq->work); | |
505 | else | |
506 | btrfs_queue_worker(&fs_info->endio_workers, | |
507 | &end_io_wq->work); | |
508 | } | |
ce9adaa5 CM |
509 | } |
510 | ||
0cb59c99 JB |
511 | /* |
512 | * For the metadata arg you want | |
513 | * | |
514 | * 0 - if data | |
515 | * 1 - if normal metadta | |
516 | * 2 - if writing to the free space cache area | |
517 | */ | |
22c59948 CM |
518 | int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, |
519 | int metadata) | |
0b86a832 | 520 | { |
ce9adaa5 | 521 | struct end_io_wq *end_io_wq; |
ce9adaa5 CM |
522 | end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS); |
523 | if (!end_io_wq) | |
524 | return -ENOMEM; | |
525 | ||
526 | end_io_wq->private = bio->bi_private; | |
527 | end_io_wq->end_io = bio->bi_end_io; | |
22c59948 | 528 | end_io_wq->info = info; |
ce9adaa5 CM |
529 | end_io_wq->error = 0; |
530 | end_io_wq->bio = bio; | |
22c59948 | 531 | end_io_wq->metadata = metadata; |
ce9adaa5 CM |
532 | |
533 | bio->bi_private = end_io_wq; | |
534 | bio->bi_end_io = end_workqueue_bio; | |
22c59948 CM |
535 | return 0; |
536 | } | |
537 | ||
b64a2851 | 538 | unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info) |
0986fe9e | 539 | { |
4854ddd0 CM |
540 | unsigned long limit = min_t(unsigned long, |
541 | info->workers.max_workers, | |
542 | info->fs_devices->open_devices); | |
543 | return 256 * limit; | |
544 | } | |
0986fe9e | 545 | |
4854ddd0 CM |
546 | int btrfs_congested_async(struct btrfs_fs_info *info, int iodone) |
547 | { | |
b64a2851 CM |
548 | return atomic_read(&info->nr_async_bios) > |
549 | btrfs_async_submit_limit(info); | |
0986fe9e CM |
550 | } |
551 | ||
4a69a410 CM |
552 | static void run_one_async_start(struct btrfs_work *work) |
553 | { | |
4a69a410 CM |
554 | struct async_submit_bio *async; |
555 | ||
556 | async = container_of(work, struct async_submit_bio, work); | |
4a69a410 | 557 | async->submit_bio_start(async->inode, async->rw, async->bio, |
eaf25d93 CM |
558 | async->mirror_num, async->bio_flags, |
559 | async->bio_offset); | |
4a69a410 CM |
560 | } |
561 | ||
562 | static void run_one_async_done(struct btrfs_work *work) | |
8b712842 CM |
563 | { |
564 | struct btrfs_fs_info *fs_info; | |
565 | struct async_submit_bio *async; | |
4854ddd0 | 566 | int limit; |
8b712842 CM |
567 | |
568 | async = container_of(work, struct async_submit_bio, work); | |
569 | fs_info = BTRFS_I(async->inode)->root->fs_info; | |
4854ddd0 | 570 | |
b64a2851 | 571 | limit = btrfs_async_submit_limit(fs_info); |
4854ddd0 CM |
572 | limit = limit * 2 / 3; |
573 | ||
8b712842 | 574 | atomic_dec(&fs_info->nr_async_submits); |
0986fe9e | 575 | |
b64a2851 CM |
576 | if (atomic_read(&fs_info->nr_async_submits) < limit && |
577 | waitqueue_active(&fs_info->async_submit_wait)) | |
4854ddd0 CM |
578 | wake_up(&fs_info->async_submit_wait); |
579 | ||
4a69a410 | 580 | async->submit_bio_done(async->inode, async->rw, async->bio, |
eaf25d93 CM |
581 | async->mirror_num, async->bio_flags, |
582 | async->bio_offset); | |
4a69a410 CM |
583 | } |
584 | ||
585 | static void run_one_async_free(struct btrfs_work *work) | |
586 | { | |
587 | struct async_submit_bio *async; | |
588 | ||
589 | async = container_of(work, struct async_submit_bio, work); | |
8b712842 CM |
590 | kfree(async); |
591 | } | |
592 | ||
44b8bd7e CM |
593 | int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, |
594 | int rw, struct bio *bio, int mirror_num, | |
c8b97818 | 595 | unsigned long bio_flags, |
eaf25d93 | 596 | u64 bio_offset, |
4a69a410 CM |
597 | extent_submit_bio_hook_t *submit_bio_start, |
598 | extent_submit_bio_hook_t *submit_bio_done) | |
44b8bd7e CM |
599 | { |
600 | struct async_submit_bio *async; | |
601 | ||
602 | async = kmalloc(sizeof(*async), GFP_NOFS); | |
603 | if (!async) | |
604 | return -ENOMEM; | |
605 | ||
606 | async->inode = inode; | |
607 | async->rw = rw; | |
608 | async->bio = bio; | |
609 | async->mirror_num = mirror_num; | |
4a69a410 CM |
610 | async->submit_bio_start = submit_bio_start; |
611 | async->submit_bio_done = submit_bio_done; | |
612 | ||
613 | async->work.func = run_one_async_start; | |
614 | async->work.ordered_func = run_one_async_done; | |
615 | async->work.ordered_free = run_one_async_free; | |
616 | ||
8b712842 | 617 | async->work.flags = 0; |
c8b97818 | 618 | async->bio_flags = bio_flags; |
eaf25d93 | 619 | async->bio_offset = bio_offset; |
8c8bee1d | 620 | |
cb03c743 | 621 | atomic_inc(&fs_info->nr_async_submits); |
d313d7a3 | 622 | |
7b6d91da | 623 | if (rw & REQ_SYNC) |
d313d7a3 CM |
624 | btrfs_set_work_high_prio(&async->work); |
625 | ||
8b712842 | 626 | btrfs_queue_worker(&fs_info->workers, &async->work); |
9473f16c | 627 | |
d397712b | 628 | while (atomic_read(&fs_info->async_submit_draining) && |
771ed689 CM |
629 | atomic_read(&fs_info->nr_async_submits)) { |
630 | wait_event(fs_info->async_submit_wait, | |
631 | (atomic_read(&fs_info->nr_async_submits) == 0)); | |
632 | } | |
633 | ||
44b8bd7e CM |
634 | return 0; |
635 | } | |
636 | ||
ce3ed71a CM |
637 | static int btree_csum_one_bio(struct bio *bio) |
638 | { | |
639 | struct bio_vec *bvec = bio->bi_io_vec; | |
640 | int bio_index = 0; | |
641 | struct btrfs_root *root; | |
642 | ||
643 | WARN_ON(bio->bi_vcnt <= 0); | |
d397712b | 644 | while (bio_index < bio->bi_vcnt) { |
ce3ed71a CM |
645 | root = BTRFS_I(bvec->bv_page->mapping->host)->root; |
646 | csum_dirty_buffer(root, bvec->bv_page); | |
647 | bio_index++; | |
648 | bvec++; | |
649 | } | |
650 | return 0; | |
651 | } | |
652 | ||
4a69a410 CM |
653 | static int __btree_submit_bio_start(struct inode *inode, int rw, |
654 | struct bio *bio, int mirror_num, | |
eaf25d93 CM |
655 | unsigned long bio_flags, |
656 | u64 bio_offset) | |
22c59948 | 657 | { |
8b712842 CM |
658 | /* |
659 | * when we're called for a write, we're already in the async | |
5443be45 | 660 | * submission context. Just jump into btrfs_map_bio |
8b712842 | 661 | */ |
4a69a410 CM |
662 | btree_csum_one_bio(bio); |
663 | return 0; | |
664 | } | |
22c59948 | 665 | |
4a69a410 | 666 | static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
667 | int mirror_num, unsigned long bio_flags, |
668 | u64 bio_offset) | |
4a69a410 | 669 | { |
8b712842 | 670 | /* |
4a69a410 CM |
671 | * when we're called for a write, we're already in the async |
672 | * submission context. Just jump into btrfs_map_bio | |
8b712842 | 673 | */ |
8b712842 | 674 | return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1); |
0b86a832 CM |
675 | } |
676 | ||
44b8bd7e | 677 | static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
678 | int mirror_num, unsigned long bio_flags, |
679 | u64 bio_offset) | |
44b8bd7e | 680 | { |
cad321ad CM |
681 | int ret; |
682 | ||
683 | ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info, | |
684 | bio, 1); | |
685 | BUG_ON(ret); | |
686 | ||
7b6d91da | 687 | if (!(rw & REQ_WRITE)) { |
4a69a410 CM |
688 | /* |
689 | * called for a read, do the setup so that checksum validation | |
690 | * can happen in the async kernel threads | |
691 | */ | |
4a69a410 | 692 | return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, |
6f3577bd | 693 | mirror_num, 0); |
44b8bd7e | 694 | } |
d313d7a3 | 695 | |
cad321ad CM |
696 | /* |
697 | * kthread helpers are used to submit writes so that checksumming | |
698 | * can happen in parallel across all CPUs | |
699 | */ | |
44b8bd7e | 700 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
c8b97818 | 701 | inode, rw, bio, mirror_num, 0, |
eaf25d93 | 702 | bio_offset, |
4a69a410 CM |
703 | __btree_submit_bio_start, |
704 | __btree_submit_bio_done); | |
44b8bd7e CM |
705 | } |
706 | ||
3dd1462e | 707 | #ifdef CONFIG_MIGRATION |
784b4e29 CM |
708 | static int btree_migratepage(struct address_space *mapping, |
709 | struct page *newpage, struct page *page) | |
710 | { | |
711 | /* | |
712 | * we can't safely write a btree page from here, | |
713 | * we haven't done the locking hook | |
714 | */ | |
715 | if (PageDirty(page)) | |
716 | return -EAGAIN; | |
717 | /* | |
718 | * Buffers may be managed in a filesystem specific way. | |
719 | * We must have no buffers or drop them. | |
720 | */ | |
721 | if (page_has_private(page) && | |
722 | !try_to_release_page(page, GFP_KERNEL)) | |
723 | return -EAGAIN; | |
784b4e29 CM |
724 | return migrate_page(mapping, newpage, page); |
725 | } | |
3dd1462e | 726 | #endif |
784b4e29 | 727 | |
0da5468f CM |
728 | static int btree_writepage(struct page *page, struct writeback_control *wbc) |
729 | { | |
d1310b2e | 730 | struct extent_io_tree *tree; |
b9473439 CM |
731 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; |
732 | struct extent_buffer *eb; | |
733 | int was_dirty; | |
734 | ||
d1310b2e | 735 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
b9473439 CM |
736 | if (!(current->flags & PF_MEMALLOC)) { |
737 | return extent_write_full_page(tree, page, | |
738 | btree_get_extent, wbc); | |
739 | } | |
5443be45 | 740 | |
b9473439 | 741 | redirty_page_for_writepage(wbc, page); |
784b4e29 | 742 | eb = btrfs_find_tree_block(root, page_offset(page), PAGE_CACHE_SIZE); |
b9473439 CM |
743 | WARN_ON(!eb); |
744 | ||
745 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); | |
746 | if (!was_dirty) { | |
747 | spin_lock(&root->fs_info->delalloc_lock); | |
748 | root->fs_info->dirty_metadata_bytes += PAGE_CACHE_SIZE; | |
749 | spin_unlock(&root->fs_info->delalloc_lock); | |
5443be45 | 750 | } |
b9473439 CM |
751 | free_extent_buffer(eb); |
752 | ||
753 | unlock_page(page); | |
754 | return 0; | |
5f39d397 | 755 | } |
0da5468f CM |
756 | |
757 | static int btree_writepages(struct address_space *mapping, | |
758 | struct writeback_control *wbc) | |
759 | { | |
d1310b2e CM |
760 | struct extent_io_tree *tree; |
761 | tree = &BTRFS_I(mapping->host)->io_tree; | |
d8d5f3e1 | 762 | if (wbc->sync_mode == WB_SYNC_NONE) { |
b9473439 | 763 | struct btrfs_root *root = BTRFS_I(mapping->host)->root; |
793955bc | 764 | u64 num_dirty; |
24ab9cd8 | 765 | unsigned long thresh = 32 * 1024 * 1024; |
448d640b CM |
766 | |
767 | if (wbc->for_kupdate) | |
768 | return 0; | |
769 | ||
b9473439 CM |
770 | /* this is a bit racy, but that's ok */ |
771 | num_dirty = root->fs_info->dirty_metadata_bytes; | |
d397712b | 772 | if (num_dirty < thresh) |
793955bc | 773 | return 0; |
793955bc | 774 | } |
0da5468f CM |
775 | return extent_writepages(tree, mapping, btree_get_extent, wbc); |
776 | } | |
777 | ||
b2950863 | 778 | static int btree_readpage(struct file *file, struct page *page) |
5f39d397 | 779 | { |
d1310b2e CM |
780 | struct extent_io_tree *tree; |
781 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
5f39d397 CM |
782 | return extent_read_full_page(tree, page, btree_get_extent); |
783 | } | |
22b0ebda | 784 | |
70dec807 | 785 | static int btree_releasepage(struct page *page, gfp_t gfp_flags) |
5f39d397 | 786 | { |
d1310b2e CM |
787 | struct extent_io_tree *tree; |
788 | struct extent_map_tree *map; | |
5f39d397 | 789 | int ret; |
d98237b3 | 790 | |
98509cfc | 791 | if (PageWriteback(page) || PageDirty(page)) |
d397712b | 792 | return 0; |
98509cfc | 793 | |
d1310b2e CM |
794 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
795 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
6af118ce | 796 | |
7b13b7b1 | 797 | ret = try_release_extent_state(map, tree, page, gfp_flags); |
d397712b | 798 | if (!ret) |
6af118ce | 799 | return 0; |
6af118ce CM |
800 | |
801 | ret = try_release_extent_buffer(tree, page); | |
5f39d397 CM |
802 | if (ret == 1) { |
803 | ClearPagePrivate(page); | |
804 | set_page_private(page, 0); | |
805 | page_cache_release(page); | |
806 | } | |
6af118ce | 807 | |
d98237b3 CM |
808 | return ret; |
809 | } | |
810 | ||
5f39d397 | 811 | static void btree_invalidatepage(struct page *page, unsigned long offset) |
d98237b3 | 812 | { |
d1310b2e CM |
813 | struct extent_io_tree *tree; |
814 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
5f39d397 CM |
815 | extent_invalidatepage(tree, page, offset); |
816 | btree_releasepage(page, GFP_NOFS); | |
9ad6b7bc | 817 | if (PagePrivate(page)) { |
d397712b CM |
818 | printk(KERN_WARNING "btrfs warning page private not zero " |
819 | "on page %llu\n", (unsigned long long)page_offset(page)); | |
9ad6b7bc CM |
820 | ClearPagePrivate(page); |
821 | set_page_private(page, 0); | |
822 | page_cache_release(page); | |
823 | } | |
d98237b3 CM |
824 | } |
825 | ||
7f09410b | 826 | static const struct address_space_operations btree_aops = { |
d98237b3 CM |
827 | .readpage = btree_readpage, |
828 | .writepage = btree_writepage, | |
0da5468f | 829 | .writepages = btree_writepages, |
5f39d397 CM |
830 | .releasepage = btree_releasepage, |
831 | .invalidatepage = btree_invalidatepage, | |
d98237b3 | 832 | .sync_page = block_sync_page, |
5a92bc88 | 833 | #ifdef CONFIG_MIGRATION |
784b4e29 | 834 | .migratepage = btree_migratepage, |
5a92bc88 | 835 | #endif |
d98237b3 CM |
836 | }; |
837 | ||
ca7a79ad CM |
838 | int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, |
839 | u64 parent_transid) | |
090d1875 | 840 | { |
5f39d397 CM |
841 | struct extent_buffer *buf = NULL; |
842 | struct inode *btree_inode = root->fs_info->btree_inode; | |
de428b63 | 843 | int ret = 0; |
090d1875 | 844 | |
db94535d | 845 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
5f39d397 | 846 | if (!buf) |
090d1875 | 847 | return 0; |
d1310b2e | 848 | read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, |
f188591e | 849 | buf, 0, 0, btree_get_extent, 0); |
5f39d397 | 850 | free_extent_buffer(buf); |
de428b63 | 851 | return ret; |
090d1875 CM |
852 | } |
853 | ||
0999df54 CM |
854 | struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, |
855 | u64 bytenr, u32 blocksize) | |
856 | { | |
857 | struct inode *btree_inode = root->fs_info->btree_inode; | |
858 | struct extent_buffer *eb; | |
859 | eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, | |
860 | bytenr, blocksize, GFP_NOFS); | |
861 | return eb; | |
862 | } | |
863 | ||
864 | struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, | |
865 | u64 bytenr, u32 blocksize) | |
866 | { | |
867 | struct inode *btree_inode = root->fs_info->btree_inode; | |
868 | struct extent_buffer *eb; | |
869 | ||
870 | eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree, | |
871 | bytenr, blocksize, NULL, GFP_NOFS); | |
872 | return eb; | |
873 | } | |
874 | ||
875 | ||
e02119d5 CM |
876 | int btrfs_write_tree_block(struct extent_buffer *buf) |
877 | { | |
8aa38c31 CH |
878 | return filemap_fdatawrite_range(buf->first_page->mapping, buf->start, |
879 | buf->start + buf->len - 1); | |
e02119d5 CM |
880 | } |
881 | ||
882 | int btrfs_wait_tree_block_writeback(struct extent_buffer *buf) | |
883 | { | |
8aa38c31 CH |
884 | return filemap_fdatawait_range(buf->first_page->mapping, |
885 | buf->start, buf->start + buf->len - 1); | |
e02119d5 CM |
886 | } |
887 | ||
0999df54 | 888 | struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, |
ca7a79ad | 889 | u32 blocksize, u64 parent_transid) |
0999df54 CM |
890 | { |
891 | struct extent_buffer *buf = NULL; | |
0999df54 CM |
892 | int ret; |
893 | ||
0999df54 CM |
894 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
895 | if (!buf) | |
896 | return NULL; | |
0999df54 | 897 | |
ca7a79ad | 898 | ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); |
ce9adaa5 | 899 | |
d397712b | 900 | if (ret == 0) |
b4ce94de | 901 | set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); |
5f39d397 | 902 | return buf; |
ce9adaa5 | 903 | |
eb60ceac CM |
904 | } |
905 | ||
e089f05c | 906 | int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
5f39d397 | 907 | struct extent_buffer *buf) |
ed2ff2cb | 908 | { |
5f39d397 | 909 | struct inode *btree_inode = root->fs_info->btree_inode; |
55c69072 | 910 | if (btrfs_header_generation(buf) == |
925baedd | 911 | root->fs_info->running_transaction->transid) { |
b9447ef8 | 912 | btrfs_assert_tree_locked(buf); |
b4ce94de | 913 | |
b9473439 CM |
914 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) { |
915 | spin_lock(&root->fs_info->delalloc_lock); | |
916 | if (root->fs_info->dirty_metadata_bytes >= buf->len) | |
917 | root->fs_info->dirty_metadata_bytes -= buf->len; | |
918 | else | |
919 | WARN_ON(1); | |
920 | spin_unlock(&root->fs_info->delalloc_lock); | |
921 | } | |
b4ce94de | 922 | |
b9473439 CM |
923 | /* ugh, clear_extent_buffer_dirty needs to lock the page */ |
924 | btrfs_set_lock_blocking(buf); | |
d1310b2e | 925 | clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, |
55c69072 | 926 | buf); |
925baedd | 927 | } |
5f39d397 CM |
928 | return 0; |
929 | } | |
930 | ||
db94535d | 931 | static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, |
87ee04eb | 932 | u32 stripesize, struct btrfs_root *root, |
9f5fae2f | 933 | struct btrfs_fs_info *fs_info, |
e20d96d6 | 934 | u64 objectid) |
d97e63b6 | 935 | { |
cfaa7295 | 936 | root->node = NULL; |
a28ec197 | 937 | root->commit_root = NULL; |
db94535d CM |
938 | root->sectorsize = sectorsize; |
939 | root->nodesize = nodesize; | |
940 | root->leafsize = leafsize; | |
87ee04eb | 941 | root->stripesize = stripesize; |
123abc88 | 942 | root->ref_cows = 0; |
0b86a832 | 943 | root->track_dirty = 0; |
c71bf099 | 944 | root->in_radix = 0; |
d68fc57b YZ |
945 | root->orphan_item_inserted = 0; |
946 | root->orphan_cleanup_state = 0; | |
0b86a832 | 947 | |
9f5fae2f | 948 | root->fs_info = fs_info; |
0f7d52f4 CM |
949 | root->objectid = objectid; |
950 | root->last_trans = 0; | |
13a8a7c8 | 951 | root->highest_objectid = 0; |
58176a96 | 952 | root->name = NULL; |
4313b399 | 953 | root->in_sysfs = 0; |
6bef4d31 | 954 | root->inode_tree = RB_ROOT; |
f0486c68 | 955 | root->block_rsv = NULL; |
d68fc57b | 956 | root->orphan_block_rsv = NULL; |
0b86a832 CM |
957 | |
958 | INIT_LIST_HEAD(&root->dirty_list); | |
7b128766 | 959 | INIT_LIST_HEAD(&root->orphan_list); |
5d4f98a2 | 960 | INIT_LIST_HEAD(&root->root_list); |
925baedd | 961 | spin_lock_init(&root->node_lock); |
d68fc57b | 962 | spin_lock_init(&root->orphan_lock); |
5d4f98a2 | 963 | spin_lock_init(&root->inode_lock); |
f0486c68 | 964 | spin_lock_init(&root->accounting_lock); |
a2135011 | 965 | mutex_init(&root->objectid_mutex); |
e02119d5 | 966 | mutex_init(&root->log_mutex); |
7237f183 YZ |
967 | init_waitqueue_head(&root->log_writer_wait); |
968 | init_waitqueue_head(&root->log_commit_wait[0]); | |
969 | init_waitqueue_head(&root->log_commit_wait[1]); | |
970 | atomic_set(&root->log_commit[0], 0); | |
971 | atomic_set(&root->log_commit[1], 0); | |
972 | atomic_set(&root->log_writers, 0); | |
973 | root->log_batch = 0; | |
974 | root->log_transid = 0; | |
257c62e1 | 975 | root->last_log_commit = 0; |
d0c803c4 CM |
976 | extent_io_tree_init(&root->dirty_log_pages, |
977 | fs_info->btree_inode->i_mapping, GFP_NOFS); | |
017e5369 | 978 | |
3768f368 CM |
979 | memset(&root->root_key, 0, sizeof(root->root_key)); |
980 | memset(&root->root_item, 0, sizeof(root->root_item)); | |
6702ed49 | 981 | memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); |
58176a96 | 982 | memset(&root->root_kobj, 0, sizeof(root->root_kobj)); |
3f157a2f | 983 | root->defrag_trans_start = fs_info->generation; |
58176a96 | 984 | init_completion(&root->kobj_unregister); |
6702ed49 | 985 | root->defrag_running = 0; |
4d775673 | 986 | root->root_key.objectid = objectid; |
3394e160 CM |
987 | root->anon_super.s_root = NULL; |
988 | root->anon_super.s_dev = 0; | |
989 | INIT_LIST_HEAD(&root->anon_super.s_list); | |
990 | INIT_LIST_HEAD(&root->anon_super.s_instances); | |
991 | init_rwsem(&root->anon_super.s_umount); | |
992 | ||
3768f368 CM |
993 | return 0; |
994 | } | |
995 | ||
db94535d | 996 | static int find_and_setup_root(struct btrfs_root *tree_root, |
9f5fae2f CM |
997 | struct btrfs_fs_info *fs_info, |
998 | u64 objectid, | |
e20d96d6 | 999 | struct btrfs_root *root) |
3768f368 CM |
1000 | { |
1001 | int ret; | |
db94535d | 1002 | u32 blocksize; |
84234f3a | 1003 | u64 generation; |
3768f368 | 1004 | |
db94535d | 1005 | __setup_root(tree_root->nodesize, tree_root->leafsize, |
87ee04eb CM |
1006 | tree_root->sectorsize, tree_root->stripesize, |
1007 | root, fs_info, objectid); | |
3768f368 CM |
1008 | ret = btrfs_find_last_root(tree_root, objectid, |
1009 | &root->root_item, &root->root_key); | |
4df27c4d YZ |
1010 | if (ret > 0) |
1011 | return -ENOENT; | |
3768f368 CM |
1012 | BUG_ON(ret); |
1013 | ||
84234f3a | 1014 | generation = btrfs_root_generation(&root->root_item); |
db94535d CM |
1015 | blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); |
1016 | root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), | |
84234f3a | 1017 | blocksize, generation); |
68433b73 CM |
1018 | if (!root->node || !btrfs_buffer_uptodate(root->node, generation)) { |
1019 | free_extent_buffer(root->node); | |
1020 | return -EIO; | |
1021 | } | |
4df27c4d | 1022 | root->commit_root = btrfs_root_node(root); |
d97e63b6 CM |
1023 | return 0; |
1024 | } | |
1025 | ||
7237f183 YZ |
1026 | static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans, |
1027 | struct btrfs_fs_info *fs_info) | |
0f7d52f4 CM |
1028 | { |
1029 | struct btrfs_root *root; | |
1030 | struct btrfs_root *tree_root = fs_info->tree_root; | |
7237f183 | 1031 | struct extent_buffer *leaf; |
e02119d5 CM |
1032 | |
1033 | root = kzalloc(sizeof(*root), GFP_NOFS); | |
1034 | if (!root) | |
7237f183 | 1035 | return ERR_PTR(-ENOMEM); |
e02119d5 CM |
1036 | |
1037 | __setup_root(tree_root->nodesize, tree_root->leafsize, | |
1038 | tree_root->sectorsize, tree_root->stripesize, | |
1039 | root, fs_info, BTRFS_TREE_LOG_OBJECTID); | |
1040 | ||
1041 | root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; | |
1042 | root->root_key.type = BTRFS_ROOT_ITEM_KEY; | |
1043 | root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; | |
7237f183 YZ |
1044 | /* |
1045 | * log trees do not get reference counted because they go away | |
1046 | * before a real commit is actually done. They do store pointers | |
1047 | * to file data extents, and those reference counts still get | |
1048 | * updated (along with back refs to the log tree). | |
1049 | */ | |
e02119d5 CM |
1050 | root->ref_cows = 0; |
1051 | ||
5d4f98a2 YZ |
1052 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, |
1053 | BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0); | |
7237f183 YZ |
1054 | if (IS_ERR(leaf)) { |
1055 | kfree(root); | |
1056 | return ERR_CAST(leaf); | |
1057 | } | |
e02119d5 | 1058 | |
5d4f98a2 YZ |
1059 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
1060 | btrfs_set_header_bytenr(leaf, leaf->start); | |
1061 | btrfs_set_header_generation(leaf, trans->transid); | |
1062 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); | |
1063 | btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID); | |
7237f183 | 1064 | root->node = leaf; |
e02119d5 CM |
1065 | |
1066 | write_extent_buffer(root->node, root->fs_info->fsid, | |
1067 | (unsigned long)btrfs_header_fsid(root->node), | |
1068 | BTRFS_FSID_SIZE); | |
1069 | btrfs_mark_buffer_dirty(root->node); | |
1070 | btrfs_tree_unlock(root->node); | |
7237f183 YZ |
1071 | return root; |
1072 | } | |
1073 | ||
1074 | int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, | |
1075 | struct btrfs_fs_info *fs_info) | |
1076 | { | |
1077 | struct btrfs_root *log_root; | |
1078 | ||
1079 | log_root = alloc_log_tree(trans, fs_info); | |
1080 | if (IS_ERR(log_root)) | |
1081 | return PTR_ERR(log_root); | |
1082 | WARN_ON(fs_info->log_root_tree); | |
1083 | fs_info->log_root_tree = log_root; | |
1084 | return 0; | |
1085 | } | |
1086 | ||
1087 | int btrfs_add_log_tree(struct btrfs_trans_handle *trans, | |
1088 | struct btrfs_root *root) | |
1089 | { | |
1090 | struct btrfs_root *log_root; | |
1091 | struct btrfs_inode_item *inode_item; | |
1092 | ||
1093 | log_root = alloc_log_tree(trans, root->fs_info); | |
1094 | if (IS_ERR(log_root)) | |
1095 | return PTR_ERR(log_root); | |
1096 | ||
1097 | log_root->last_trans = trans->transid; | |
1098 | log_root->root_key.offset = root->root_key.objectid; | |
1099 | ||
1100 | inode_item = &log_root->root_item.inode; | |
1101 | inode_item->generation = cpu_to_le64(1); | |
1102 | inode_item->size = cpu_to_le64(3); | |
1103 | inode_item->nlink = cpu_to_le32(1); | |
1104 | inode_item->nbytes = cpu_to_le64(root->leafsize); | |
1105 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
1106 | ||
5d4f98a2 | 1107 | btrfs_set_root_node(&log_root->root_item, log_root->node); |
7237f183 YZ |
1108 | |
1109 | WARN_ON(root->log_root); | |
1110 | root->log_root = log_root; | |
1111 | root->log_transid = 0; | |
257c62e1 | 1112 | root->last_log_commit = 0; |
e02119d5 CM |
1113 | return 0; |
1114 | } | |
1115 | ||
1116 | struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root, | |
1117 | struct btrfs_key *location) | |
1118 | { | |
1119 | struct btrfs_root *root; | |
1120 | struct btrfs_fs_info *fs_info = tree_root->fs_info; | |
0f7d52f4 | 1121 | struct btrfs_path *path; |
5f39d397 | 1122 | struct extent_buffer *l; |
84234f3a | 1123 | u64 generation; |
db94535d | 1124 | u32 blocksize; |
0f7d52f4 CM |
1125 | int ret = 0; |
1126 | ||
5eda7b5e | 1127 | root = kzalloc(sizeof(*root), GFP_NOFS); |
0cf6c620 | 1128 | if (!root) |
0f7d52f4 | 1129 | return ERR_PTR(-ENOMEM); |
0f7d52f4 | 1130 | if (location->offset == (u64)-1) { |
db94535d | 1131 | ret = find_and_setup_root(tree_root, fs_info, |
0f7d52f4 CM |
1132 | location->objectid, root); |
1133 | if (ret) { | |
0f7d52f4 CM |
1134 | kfree(root); |
1135 | return ERR_PTR(ret); | |
1136 | } | |
13a8a7c8 | 1137 | goto out; |
0f7d52f4 CM |
1138 | } |
1139 | ||
db94535d | 1140 | __setup_root(tree_root->nodesize, tree_root->leafsize, |
87ee04eb CM |
1141 | tree_root->sectorsize, tree_root->stripesize, |
1142 | root, fs_info, location->objectid); | |
0f7d52f4 CM |
1143 | |
1144 | path = btrfs_alloc_path(); | |
1145 | BUG_ON(!path); | |
1146 | ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); | |
13a8a7c8 YZ |
1147 | if (ret == 0) { |
1148 | l = path->nodes[0]; | |
1149 | read_extent_buffer(l, &root->root_item, | |
1150 | btrfs_item_ptr_offset(l, path->slots[0]), | |
1151 | sizeof(root->root_item)); | |
1152 | memcpy(&root->root_key, location, sizeof(*location)); | |
0f7d52f4 | 1153 | } |
0f7d52f4 CM |
1154 | btrfs_free_path(path); |
1155 | if (ret) { | |
5e540f77 | 1156 | kfree(root); |
13a8a7c8 YZ |
1157 | if (ret > 0) |
1158 | ret = -ENOENT; | |
0f7d52f4 CM |
1159 | return ERR_PTR(ret); |
1160 | } | |
13a8a7c8 | 1161 | |
84234f3a | 1162 | generation = btrfs_root_generation(&root->root_item); |
db94535d CM |
1163 | blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); |
1164 | root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), | |
84234f3a | 1165 | blocksize, generation); |
5d4f98a2 | 1166 | root->commit_root = btrfs_root_node(root); |
0f7d52f4 | 1167 | BUG_ON(!root->node); |
13a8a7c8 YZ |
1168 | out: |
1169 | if (location->objectid != BTRFS_TREE_LOG_OBJECTID) | |
e02119d5 | 1170 | root->ref_cows = 1; |
13a8a7c8 | 1171 | |
5eda7b5e CM |
1172 | return root; |
1173 | } | |
1174 | ||
dc17ff8f CM |
1175 | struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, |
1176 | u64 root_objectid) | |
1177 | { | |
1178 | struct btrfs_root *root; | |
1179 | ||
1180 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1181 | return fs_info->tree_root; | |
1182 | if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID) | |
1183 | return fs_info->extent_root; | |
1184 | ||
1185 | root = radix_tree_lookup(&fs_info->fs_roots_radix, | |
1186 | (unsigned long)root_objectid); | |
1187 | return root; | |
1188 | } | |
1189 | ||
edbd8d4e CM |
1190 | struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, |
1191 | struct btrfs_key *location) | |
5eda7b5e CM |
1192 | { |
1193 | struct btrfs_root *root; | |
1194 | int ret; | |
1195 | ||
edbd8d4e CM |
1196 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) |
1197 | return fs_info->tree_root; | |
1198 | if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) | |
1199 | return fs_info->extent_root; | |
8f18cf13 CM |
1200 | if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) |
1201 | return fs_info->chunk_root; | |
1202 | if (location->objectid == BTRFS_DEV_TREE_OBJECTID) | |
1203 | return fs_info->dev_root; | |
0403e47e YZ |
1204 | if (location->objectid == BTRFS_CSUM_TREE_OBJECTID) |
1205 | return fs_info->csum_root; | |
4df27c4d YZ |
1206 | again: |
1207 | spin_lock(&fs_info->fs_roots_radix_lock); | |
5eda7b5e CM |
1208 | root = radix_tree_lookup(&fs_info->fs_roots_radix, |
1209 | (unsigned long)location->objectid); | |
4df27c4d | 1210 | spin_unlock(&fs_info->fs_roots_radix_lock); |
5eda7b5e CM |
1211 | if (root) |
1212 | return root; | |
1213 | ||
e02119d5 | 1214 | root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location); |
5eda7b5e CM |
1215 | if (IS_ERR(root)) |
1216 | return root; | |
3394e160 CM |
1217 | |
1218 | set_anon_super(&root->anon_super, NULL); | |
1219 | ||
d68fc57b YZ |
1220 | if (btrfs_root_refs(&root->root_item) == 0) { |
1221 | ret = -ENOENT; | |
1222 | goto fail; | |
1223 | } | |
1224 | ||
1225 | ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid); | |
1226 | if (ret < 0) | |
1227 | goto fail; | |
1228 | if (ret == 0) | |
1229 | root->orphan_item_inserted = 1; | |
1230 | ||
4df27c4d YZ |
1231 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); |
1232 | if (ret) | |
1233 | goto fail; | |
1234 | ||
1235 | spin_lock(&fs_info->fs_roots_radix_lock); | |
2619ba1f CM |
1236 | ret = radix_tree_insert(&fs_info->fs_roots_radix, |
1237 | (unsigned long)root->root_key.objectid, | |
0f7d52f4 | 1238 | root); |
d68fc57b | 1239 | if (ret == 0) |
4df27c4d | 1240 | root->in_radix = 1; |
d68fc57b | 1241 | |
4df27c4d YZ |
1242 | spin_unlock(&fs_info->fs_roots_radix_lock); |
1243 | radix_tree_preload_end(); | |
0f7d52f4 | 1244 | if (ret) { |
4df27c4d YZ |
1245 | if (ret == -EEXIST) { |
1246 | free_fs_root(root); | |
1247 | goto again; | |
1248 | } | |
1249 | goto fail; | |
0f7d52f4 | 1250 | } |
4df27c4d YZ |
1251 | |
1252 | ret = btrfs_find_dead_roots(fs_info->tree_root, | |
1253 | root->root_key.objectid); | |
1254 | WARN_ON(ret); | |
edbd8d4e | 1255 | return root; |
4df27c4d YZ |
1256 | fail: |
1257 | free_fs_root(root); | |
1258 | return ERR_PTR(ret); | |
edbd8d4e CM |
1259 | } |
1260 | ||
1261 | struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, | |
1262 | struct btrfs_key *location, | |
1263 | const char *name, int namelen) | |
1264 | { | |
4df27c4d YZ |
1265 | return btrfs_read_fs_root_no_name(fs_info, location); |
1266 | #if 0 | |
edbd8d4e CM |
1267 | struct btrfs_root *root; |
1268 | int ret; | |
1269 | ||
1270 | root = btrfs_read_fs_root_no_name(fs_info, location); | |
1271 | if (!root) | |
1272 | return NULL; | |
58176a96 | 1273 | |
4313b399 CM |
1274 | if (root->in_sysfs) |
1275 | return root; | |
1276 | ||
58176a96 JB |
1277 | ret = btrfs_set_root_name(root, name, namelen); |
1278 | if (ret) { | |
5f39d397 | 1279 | free_extent_buffer(root->node); |
58176a96 JB |
1280 | kfree(root); |
1281 | return ERR_PTR(ret); | |
1282 | } | |
4df27c4d | 1283 | |
58176a96 JB |
1284 | ret = btrfs_sysfs_add_root(root); |
1285 | if (ret) { | |
5f39d397 | 1286 | free_extent_buffer(root->node); |
58176a96 JB |
1287 | kfree(root->name); |
1288 | kfree(root); | |
1289 | return ERR_PTR(ret); | |
1290 | } | |
4313b399 | 1291 | root->in_sysfs = 1; |
0f7d52f4 | 1292 | return root; |
4df27c4d | 1293 | #endif |
0f7d52f4 | 1294 | } |
04160088 CM |
1295 | |
1296 | static int btrfs_congested_fn(void *congested_data, int bdi_bits) | |
1297 | { | |
1298 | struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; | |
1299 | int ret = 0; | |
04160088 CM |
1300 | struct btrfs_device *device; |
1301 | struct backing_dev_info *bdi; | |
b7967db7 | 1302 | |
c6e30871 | 1303 | list_for_each_entry(device, &info->fs_devices->devices, dev_list) { |
dfe25020 CM |
1304 | if (!device->bdev) |
1305 | continue; | |
04160088 CM |
1306 | bdi = blk_get_backing_dev_info(device->bdev); |
1307 | if (bdi && bdi_congested(bdi, bdi_bits)) { | |
1308 | ret = 1; | |
1309 | break; | |
1310 | } | |
1311 | } | |
1312 | return ret; | |
1313 | } | |
1314 | ||
38b66988 CM |
1315 | /* |
1316 | * this unplugs every device on the box, and it is only used when page | |
1317 | * is null | |
1318 | */ | |
1319 | static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page) | |
1320 | { | |
38b66988 CM |
1321 | struct btrfs_device *device; |
1322 | struct btrfs_fs_info *info; | |
1323 | ||
1324 | info = (struct btrfs_fs_info *)bdi->unplug_io_data; | |
c6e30871 | 1325 | list_for_each_entry(device, &info->fs_devices->devices, dev_list) { |
d20f7043 CM |
1326 | if (!device->bdev) |
1327 | continue; | |
1328 | ||
38b66988 | 1329 | bdi = blk_get_backing_dev_info(device->bdev); |
d397712b | 1330 | if (bdi->unplug_io_fn) |
38b66988 | 1331 | bdi->unplug_io_fn(bdi, page); |
38b66988 CM |
1332 | } |
1333 | } | |
1334 | ||
b2950863 | 1335 | static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) |
04160088 | 1336 | { |
38b66988 | 1337 | struct inode *inode; |
f2d8d74d CM |
1338 | struct extent_map_tree *em_tree; |
1339 | struct extent_map *em; | |
bcbfce8a | 1340 | struct address_space *mapping; |
38b66988 CM |
1341 | u64 offset; |
1342 | ||
bcbfce8a | 1343 | /* the generic O_DIRECT read code does this */ |
9f0ba5bd | 1344 | if (1 || !page) { |
38b66988 CM |
1345 | __unplug_io_fn(bdi, page); |
1346 | return; | |
1347 | } | |
1348 | ||
bcbfce8a CM |
1349 | /* |
1350 | * page->mapping may change at any time. Get a consistent copy | |
1351 | * and use that for everything below | |
1352 | */ | |
1353 | smp_mb(); | |
1354 | mapping = page->mapping; | |
1355 | if (!mapping) | |
1356 | return; | |
1357 | ||
1358 | inode = mapping->host; | |
240d5d48 CM |
1359 | |
1360 | /* | |
1361 | * don't do the expensive searching for a small number of | |
1362 | * devices | |
1363 | */ | |
1364 | if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) { | |
1365 | __unplug_io_fn(bdi, page); | |
1366 | return; | |
1367 | } | |
1368 | ||
38b66988 | 1369 | offset = page_offset(page); |
04160088 | 1370 | |
f2d8d74d | 1371 | em_tree = &BTRFS_I(inode)->extent_tree; |
890871be | 1372 | read_lock(&em_tree->lock); |
f2d8d74d | 1373 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); |
890871be | 1374 | read_unlock(&em_tree->lock); |
89642229 CM |
1375 | if (!em) { |
1376 | __unplug_io_fn(bdi, page); | |
f2d8d74d | 1377 | return; |
89642229 | 1378 | } |
f2d8d74d | 1379 | |
89642229 CM |
1380 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
1381 | free_extent_map(em); | |
1382 | __unplug_io_fn(bdi, page); | |
1383 | return; | |
1384 | } | |
f2d8d74d CM |
1385 | offset = offset - em->start; |
1386 | btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree, | |
1387 | em->block_start + offset, page); | |
1388 | free_extent_map(em); | |
04160088 CM |
1389 | } |
1390 | ||
ad081f14 JA |
1391 | /* |
1392 | * If this fails, caller must call bdi_destroy() to get rid of the | |
1393 | * bdi again. | |
1394 | */ | |
04160088 CM |
1395 | static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) |
1396 | { | |
ad081f14 JA |
1397 | int err; |
1398 | ||
1399 | bdi->capabilities = BDI_CAP_MAP_COPY; | |
e6d086d8 | 1400 | err = bdi_setup_and_register(bdi, "btrfs", BDI_CAP_MAP_COPY); |
ad081f14 JA |
1401 | if (err) |
1402 | return err; | |
1403 | ||
4575c9cc | 1404 | bdi->ra_pages = default_backing_dev_info.ra_pages; |
04160088 CM |
1405 | bdi->unplug_io_fn = btrfs_unplug_io_fn; |
1406 | bdi->unplug_io_data = info; | |
1407 | bdi->congested_fn = btrfs_congested_fn; | |
1408 | bdi->congested_data = info; | |
1409 | return 0; | |
1410 | } | |
1411 | ||
ce9adaa5 CM |
1412 | static int bio_ready_for_csum(struct bio *bio) |
1413 | { | |
1414 | u64 length = 0; | |
1415 | u64 buf_len = 0; | |
1416 | u64 start = 0; | |
1417 | struct page *page; | |
1418 | struct extent_io_tree *io_tree = NULL; | |
ce9adaa5 CM |
1419 | struct bio_vec *bvec; |
1420 | int i; | |
1421 | int ret; | |
1422 | ||
1423 | bio_for_each_segment(bvec, bio, i) { | |
1424 | page = bvec->bv_page; | |
1425 | if (page->private == EXTENT_PAGE_PRIVATE) { | |
1426 | length += bvec->bv_len; | |
1427 | continue; | |
1428 | } | |
1429 | if (!page->private) { | |
1430 | length += bvec->bv_len; | |
1431 | continue; | |
1432 | } | |
1433 | length = bvec->bv_len; | |
1434 | buf_len = page->private >> 2; | |
1435 | start = page_offset(page) + bvec->bv_offset; | |
1436 | io_tree = &BTRFS_I(page->mapping->host)->io_tree; | |
ce9adaa5 CM |
1437 | } |
1438 | /* are we fully contained in this bio? */ | |
1439 | if (buf_len <= length) | |
1440 | return 1; | |
1441 | ||
1442 | ret = extent_range_uptodate(io_tree, start + length, | |
1443 | start + buf_len - 1); | |
ce9adaa5 CM |
1444 | return ret; |
1445 | } | |
1446 | ||
8b712842 CM |
1447 | /* |
1448 | * called by the kthread helper functions to finally call the bio end_io | |
1449 | * functions. This is where read checksum verification actually happens | |
1450 | */ | |
1451 | static void end_workqueue_fn(struct btrfs_work *work) | |
ce9adaa5 | 1452 | { |
ce9adaa5 | 1453 | struct bio *bio; |
8b712842 CM |
1454 | struct end_io_wq *end_io_wq; |
1455 | struct btrfs_fs_info *fs_info; | |
ce9adaa5 | 1456 | int error; |
ce9adaa5 | 1457 | |
8b712842 CM |
1458 | end_io_wq = container_of(work, struct end_io_wq, work); |
1459 | bio = end_io_wq->bio; | |
1460 | fs_info = end_io_wq->info; | |
ce9adaa5 | 1461 | |
cad321ad | 1462 | /* metadata bio reads are special because the whole tree block must |
8b712842 CM |
1463 | * be checksummed at once. This makes sure the entire block is in |
1464 | * ram and up to date before trying to verify things. For | |
1465 | * blocksize <= pagesize, it is basically a noop | |
1466 | */ | |
7b6d91da | 1467 | if (!(bio->bi_rw & REQ_WRITE) && end_io_wq->metadata && |
cad321ad | 1468 | !bio_ready_for_csum(bio)) { |
d20f7043 | 1469 | btrfs_queue_worker(&fs_info->endio_meta_workers, |
8b712842 CM |
1470 | &end_io_wq->work); |
1471 | return; | |
1472 | } | |
1473 | error = end_io_wq->error; | |
1474 | bio->bi_private = end_io_wq->private; | |
1475 | bio->bi_end_io = end_io_wq->end_io; | |
1476 | kfree(end_io_wq); | |
8b712842 | 1477 | bio_endio(bio, error); |
44b8bd7e CM |
1478 | } |
1479 | ||
a74a4b97 CM |
1480 | static int cleaner_kthread(void *arg) |
1481 | { | |
1482 | struct btrfs_root *root = arg; | |
1483 | ||
1484 | do { | |
a74a4b97 | 1485 | vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); |
76dda93c YZ |
1486 | |
1487 | if (!(root->fs_info->sb->s_flags & MS_RDONLY) && | |
1488 | mutex_trylock(&root->fs_info->cleaner_mutex)) { | |
24bbcf04 | 1489 | btrfs_run_delayed_iputs(root); |
76dda93c YZ |
1490 | btrfs_clean_old_snapshots(root); |
1491 | mutex_unlock(&root->fs_info->cleaner_mutex); | |
1492 | } | |
a74a4b97 CM |
1493 | |
1494 | if (freezing(current)) { | |
1495 | refrigerator(); | |
1496 | } else { | |
a74a4b97 | 1497 | set_current_state(TASK_INTERRUPTIBLE); |
8929ecfa YZ |
1498 | if (!kthread_should_stop()) |
1499 | schedule(); | |
a74a4b97 CM |
1500 | __set_current_state(TASK_RUNNING); |
1501 | } | |
1502 | } while (!kthread_should_stop()); | |
1503 | return 0; | |
1504 | } | |
1505 | ||
1506 | static int transaction_kthread(void *arg) | |
1507 | { | |
1508 | struct btrfs_root *root = arg; | |
1509 | struct btrfs_trans_handle *trans; | |
1510 | struct btrfs_transaction *cur; | |
8929ecfa | 1511 | u64 transid; |
a74a4b97 CM |
1512 | unsigned long now; |
1513 | unsigned long delay; | |
1514 | int ret; | |
1515 | ||
1516 | do { | |
a74a4b97 CM |
1517 | delay = HZ * 30; |
1518 | vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); | |
1519 | mutex_lock(&root->fs_info->transaction_kthread_mutex); | |
1520 | ||
8929ecfa | 1521 | spin_lock(&root->fs_info->new_trans_lock); |
a74a4b97 CM |
1522 | cur = root->fs_info->running_transaction; |
1523 | if (!cur) { | |
8929ecfa | 1524 | spin_unlock(&root->fs_info->new_trans_lock); |
a74a4b97 CM |
1525 | goto sleep; |
1526 | } | |
31153d81 | 1527 | |
a74a4b97 | 1528 | now = get_seconds(); |
8929ecfa YZ |
1529 | if (!cur->blocked && |
1530 | (now < cur->start_time || now - cur->start_time < 30)) { | |
1531 | spin_unlock(&root->fs_info->new_trans_lock); | |
a74a4b97 CM |
1532 | delay = HZ * 5; |
1533 | goto sleep; | |
1534 | } | |
8929ecfa YZ |
1535 | transid = cur->transid; |
1536 | spin_unlock(&root->fs_info->new_trans_lock); | |
56bec294 | 1537 | |
8929ecfa YZ |
1538 | trans = btrfs_join_transaction(root, 1); |
1539 | if (transid == trans->transid) { | |
1540 | ret = btrfs_commit_transaction(trans, root); | |
1541 | BUG_ON(ret); | |
1542 | } else { | |
1543 | btrfs_end_transaction(trans, root); | |
1544 | } | |
a74a4b97 CM |
1545 | sleep: |
1546 | wake_up_process(root->fs_info->cleaner_kthread); | |
1547 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
1548 | ||
1549 | if (freezing(current)) { | |
1550 | refrigerator(); | |
1551 | } else { | |
a74a4b97 | 1552 | set_current_state(TASK_INTERRUPTIBLE); |
8929ecfa YZ |
1553 | if (!kthread_should_stop() && |
1554 | !btrfs_transaction_blocked(root->fs_info)) | |
1555 | schedule_timeout(delay); | |
a74a4b97 CM |
1556 | __set_current_state(TASK_RUNNING); |
1557 | } | |
1558 | } while (!kthread_should_stop()); | |
1559 | return 0; | |
1560 | } | |
1561 | ||
8a4b83cc | 1562 | struct btrfs_root *open_ctree(struct super_block *sb, |
dfe25020 CM |
1563 | struct btrfs_fs_devices *fs_devices, |
1564 | char *options) | |
2e635a27 | 1565 | { |
db94535d CM |
1566 | u32 sectorsize; |
1567 | u32 nodesize; | |
1568 | u32 leafsize; | |
1569 | u32 blocksize; | |
87ee04eb | 1570 | u32 stripesize; |
84234f3a | 1571 | u64 generation; |
f2b636e8 | 1572 | u64 features; |
3de4586c | 1573 | struct btrfs_key location; |
a061fc8d | 1574 | struct buffer_head *bh; |
e02119d5 | 1575 | struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root), |
e20d96d6 | 1576 | GFP_NOFS); |
d20f7043 CM |
1577 | struct btrfs_root *csum_root = kzalloc(sizeof(struct btrfs_root), |
1578 | GFP_NOFS); | |
450ba0ea JB |
1579 | struct btrfs_root *tree_root = btrfs_sb(sb); |
1580 | struct btrfs_fs_info *fs_info = tree_root->fs_info; | |
e02119d5 | 1581 | struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root), |
0b86a832 | 1582 | GFP_NOFS); |
e02119d5 | 1583 | struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root), |
0b86a832 | 1584 | GFP_NOFS); |
e02119d5 CM |
1585 | struct btrfs_root *log_tree_root; |
1586 | ||
eb60ceac | 1587 | int ret; |
e58ca020 | 1588 | int err = -EINVAL; |
4543df7e | 1589 | |
2c90e5d6 | 1590 | struct btrfs_super_block *disk_super; |
8790d502 | 1591 | |
0463bb4e | 1592 | if (!extent_root || !tree_root || !fs_info || |
d20f7043 | 1593 | !chunk_root || !dev_root || !csum_root) { |
39279cc3 CM |
1594 | err = -ENOMEM; |
1595 | goto fail; | |
1596 | } | |
76dda93c YZ |
1597 | |
1598 | ret = init_srcu_struct(&fs_info->subvol_srcu); | |
1599 | if (ret) { | |
1600 | err = ret; | |
1601 | goto fail; | |
1602 | } | |
1603 | ||
1604 | ret = setup_bdi(fs_info, &fs_info->bdi); | |
1605 | if (ret) { | |
1606 | err = ret; | |
1607 | goto fail_srcu; | |
1608 | } | |
1609 | ||
1610 | fs_info->btree_inode = new_inode(sb); | |
1611 | if (!fs_info->btree_inode) { | |
1612 | err = -ENOMEM; | |
1613 | goto fail_bdi; | |
1614 | } | |
1615 | ||
1616 | INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); | |
8fd17795 | 1617 | INIT_LIST_HEAD(&fs_info->trans_list); |
facda1e7 | 1618 | INIT_LIST_HEAD(&fs_info->dead_roots); |
24bbcf04 | 1619 | INIT_LIST_HEAD(&fs_info->delayed_iputs); |
19c00ddc | 1620 | INIT_LIST_HEAD(&fs_info->hashers); |
ea8c2819 | 1621 | INIT_LIST_HEAD(&fs_info->delalloc_inodes); |
5a3f23d5 | 1622 | INIT_LIST_HEAD(&fs_info->ordered_operations); |
11833d66 | 1623 | INIT_LIST_HEAD(&fs_info->caching_block_groups); |
1832a6d5 | 1624 | spin_lock_init(&fs_info->delalloc_lock); |
cee36a03 | 1625 | spin_lock_init(&fs_info->new_trans_lock); |
31153d81 | 1626 | spin_lock_init(&fs_info->ref_cache_lock); |
76dda93c | 1627 | spin_lock_init(&fs_info->fs_roots_radix_lock); |
24bbcf04 | 1628 | spin_lock_init(&fs_info->delayed_iput_lock); |
19c00ddc | 1629 | |
58176a96 | 1630 | init_completion(&fs_info->kobj_unregister); |
9f5fae2f CM |
1631 | fs_info->tree_root = tree_root; |
1632 | fs_info->extent_root = extent_root; | |
d20f7043 | 1633 | fs_info->csum_root = csum_root; |
0b86a832 CM |
1634 | fs_info->chunk_root = chunk_root; |
1635 | fs_info->dev_root = dev_root; | |
8a4b83cc | 1636 | fs_info->fs_devices = fs_devices; |
0b86a832 | 1637 | INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); |
6324fbf3 | 1638 | INIT_LIST_HEAD(&fs_info->space_info); |
0b86a832 | 1639 | btrfs_mapping_init(&fs_info->mapping_tree); |
f0486c68 YZ |
1640 | btrfs_init_block_rsv(&fs_info->global_block_rsv); |
1641 | btrfs_init_block_rsv(&fs_info->delalloc_block_rsv); | |
1642 | btrfs_init_block_rsv(&fs_info->trans_block_rsv); | |
1643 | btrfs_init_block_rsv(&fs_info->chunk_block_rsv); | |
1644 | btrfs_init_block_rsv(&fs_info->empty_block_rsv); | |
1645 | INIT_LIST_HEAD(&fs_info->durable_block_rsv_list); | |
1646 | mutex_init(&fs_info->durable_block_rsv_mutex); | |
cb03c743 | 1647 | atomic_set(&fs_info->nr_async_submits, 0); |
771ed689 | 1648 | atomic_set(&fs_info->async_delalloc_pages, 0); |
8c8bee1d | 1649 | atomic_set(&fs_info->async_submit_draining, 0); |
0986fe9e | 1650 | atomic_set(&fs_info->nr_async_bios, 0); |
e20d96d6 | 1651 | fs_info->sb = sb; |
6f568d35 | 1652 | fs_info->max_inline = 8192 * 1024; |
9ed74f2d | 1653 | fs_info->metadata_ratio = 0; |
c8b97818 | 1654 | |
b34b086c CM |
1655 | fs_info->thread_pool_size = min_t(unsigned long, |
1656 | num_online_cpus() + 2, 8); | |
0afbaf8c | 1657 | |
3eaa2885 CM |
1658 | INIT_LIST_HEAD(&fs_info->ordered_extents); |
1659 | spin_lock_init(&fs_info->ordered_extent_lock); | |
1660 | ||
a061fc8d CM |
1661 | sb->s_blocksize = 4096; |
1662 | sb->s_blocksize_bits = blksize_bits(4096); | |
32a88aa1 | 1663 | sb->s_bdi = &fs_info->bdi; |
a061fc8d | 1664 | |
76dda93c YZ |
1665 | fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID; |
1666 | fs_info->btree_inode->i_nlink = 1; | |
0afbaf8c CM |
1667 | /* |
1668 | * we set the i_size on the btree inode to the max possible int. | |
1669 | * the real end of the address space is determined by all of | |
1670 | * the devices in the system | |
1671 | */ | |
1672 | fs_info->btree_inode->i_size = OFFSET_MAX; | |
d98237b3 | 1673 | fs_info->btree_inode->i_mapping->a_ops = &btree_aops; |
04160088 CM |
1674 | fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; |
1675 | ||
5d4f98a2 | 1676 | RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node); |
d1310b2e | 1677 | extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, |
5f39d397 CM |
1678 | fs_info->btree_inode->i_mapping, |
1679 | GFP_NOFS); | |
d1310b2e CM |
1680 | extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree, |
1681 | GFP_NOFS); | |
1682 | ||
1683 | BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; | |
0da5468f | 1684 | |
76dda93c YZ |
1685 | BTRFS_I(fs_info->btree_inode)->root = tree_root; |
1686 | memset(&BTRFS_I(fs_info->btree_inode)->location, 0, | |
1687 | sizeof(struct btrfs_key)); | |
1688 | BTRFS_I(fs_info->btree_inode)->dummy_inode = 1; | |
c65ddb52 | 1689 | insert_inode_hash(fs_info->btree_inode); |
76dda93c | 1690 | |
0f9dd46c | 1691 | spin_lock_init(&fs_info->block_group_cache_lock); |
6bef4d31 | 1692 | fs_info->block_group_cache_tree = RB_ROOT; |
0f9dd46c | 1693 | |
11833d66 | 1694 | extent_io_tree_init(&fs_info->freed_extents[0], |
1a5bc167 | 1695 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
11833d66 YZ |
1696 | extent_io_tree_init(&fs_info->freed_extents[1], |
1697 | fs_info->btree_inode->i_mapping, GFP_NOFS); | |
1698 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
e66f709b | 1699 | fs_info->do_barriers = 1; |
e18e4809 | 1700 | |
39279cc3 | 1701 | |
79154b1b | 1702 | mutex_init(&fs_info->trans_mutex); |
5a3f23d5 | 1703 | mutex_init(&fs_info->ordered_operations_mutex); |
e02119d5 | 1704 | mutex_init(&fs_info->tree_log_mutex); |
925baedd | 1705 | mutex_init(&fs_info->chunk_mutex); |
a74a4b97 CM |
1706 | mutex_init(&fs_info->transaction_kthread_mutex); |
1707 | mutex_init(&fs_info->cleaner_mutex); | |
7d9eb12c | 1708 | mutex_init(&fs_info->volume_mutex); |
276e680d | 1709 | init_rwsem(&fs_info->extent_commit_sem); |
c71bf099 | 1710 | init_rwsem(&fs_info->cleanup_work_sem); |
76dda93c | 1711 | init_rwsem(&fs_info->subvol_sem); |
fa9c0d79 CM |
1712 | |
1713 | btrfs_init_free_cluster(&fs_info->meta_alloc_cluster); | |
1714 | btrfs_init_free_cluster(&fs_info->data_alloc_cluster); | |
1715 | ||
e6dcd2dc | 1716 | init_waitqueue_head(&fs_info->transaction_throttle); |
f9295749 | 1717 | init_waitqueue_head(&fs_info->transaction_wait); |
bb9c12c9 | 1718 | init_waitqueue_head(&fs_info->transaction_blocked_wait); |
4854ddd0 | 1719 | init_waitqueue_head(&fs_info->async_submit_wait); |
3768f368 | 1720 | |
0b86a832 | 1721 | __setup_root(4096, 4096, 4096, 4096, tree_root, |
2c90e5d6 | 1722 | fs_info, BTRFS_ROOT_TREE_OBJECTID); |
7eccb903 | 1723 | |
a512bbf8 | 1724 | bh = btrfs_read_dev_super(fs_devices->latest_bdev); |
20b45077 DY |
1725 | if (!bh) { |
1726 | err = -EINVAL; | |
39279cc3 | 1727 | goto fail_iput; |
20b45077 | 1728 | } |
39279cc3 | 1729 | |
a061fc8d | 1730 | memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy)); |
2d69a0f8 YZ |
1731 | memcpy(&fs_info->super_for_commit, &fs_info->super_copy, |
1732 | sizeof(fs_info->super_for_commit)); | |
a061fc8d | 1733 | brelse(bh); |
5f39d397 | 1734 | |
a061fc8d | 1735 | memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE); |
0b86a832 | 1736 | |
5f39d397 | 1737 | disk_super = &fs_info->super_copy; |
0f7d52f4 | 1738 | if (!btrfs_super_root(disk_super)) |
c6e2bac1 | 1739 | goto fail_iput; |
0f7d52f4 | 1740 | |
2b82032c YZ |
1741 | ret = btrfs_parse_options(tree_root, options); |
1742 | if (ret) { | |
1743 | err = ret; | |
c6e2bac1 | 1744 | goto fail_iput; |
2b82032c | 1745 | } |
dfe25020 | 1746 | |
f2b636e8 JB |
1747 | features = btrfs_super_incompat_flags(disk_super) & |
1748 | ~BTRFS_FEATURE_INCOMPAT_SUPP; | |
1749 | if (features) { | |
1750 | printk(KERN_ERR "BTRFS: couldn't mount because of " | |
1751 | "unsupported optional features (%Lx).\n", | |
21380931 | 1752 | (unsigned long long)features); |
f2b636e8 | 1753 | err = -EINVAL; |
c6e2bac1 | 1754 | goto fail_iput; |
f2b636e8 JB |
1755 | } |
1756 | ||
5d4f98a2 | 1757 | features = btrfs_super_incompat_flags(disk_super); |
a6fa6fae LZ |
1758 | features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; |
1759 | if (tree_root->fs_info->compress_type & BTRFS_COMPRESS_LZO) | |
1760 | features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; | |
1761 | btrfs_set_super_incompat_flags(disk_super, features); | |
5d4f98a2 | 1762 | |
f2b636e8 JB |
1763 | features = btrfs_super_compat_ro_flags(disk_super) & |
1764 | ~BTRFS_FEATURE_COMPAT_RO_SUPP; | |
1765 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
1766 | printk(KERN_ERR "BTRFS: couldn't mount RDWR because of " | |
1767 | "unsupported option features (%Lx).\n", | |
21380931 | 1768 | (unsigned long long)features); |
f2b636e8 | 1769 | err = -EINVAL; |
c6e2bac1 | 1770 | goto fail_iput; |
f2b636e8 | 1771 | } |
61d92c32 CM |
1772 | |
1773 | btrfs_init_workers(&fs_info->generic_worker, | |
1774 | "genwork", 1, NULL); | |
1775 | ||
5443be45 | 1776 | btrfs_init_workers(&fs_info->workers, "worker", |
61d92c32 CM |
1777 | fs_info->thread_pool_size, |
1778 | &fs_info->generic_worker); | |
c8b97818 | 1779 | |
771ed689 | 1780 | btrfs_init_workers(&fs_info->delalloc_workers, "delalloc", |
61d92c32 CM |
1781 | fs_info->thread_pool_size, |
1782 | &fs_info->generic_worker); | |
771ed689 | 1783 | |
5443be45 | 1784 | btrfs_init_workers(&fs_info->submit_workers, "submit", |
b720d209 | 1785 | min_t(u64, fs_devices->num_devices, |
61d92c32 CM |
1786 | fs_info->thread_pool_size), |
1787 | &fs_info->generic_worker); | |
61b49440 CM |
1788 | |
1789 | /* a higher idle thresh on the submit workers makes it much more | |
1790 | * likely that bios will be send down in a sane order to the | |
1791 | * devices | |
1792 | */ | |
1793 | fs_info->submit_workers.idle_thresh = 64; | |
53863232 | 1794 | |
771ed689 | 1795 | fs_info->workers.idle_thresh = 16; |
4a69a410 | 1796 | fs_info->workers.ordered = 1; |
61b49440 | 1797 | |
771ed689 CM |
1798 | fs_info->delalloc_workers.idle_thresh = 2; |
1799 | fs_info->delalloc_workers.ordered = 1; | |
1800 | ||
61d92c32 CM |
1801 | btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1, |
1802 | &fs_info->generic_worker); | |
5443be45 | 1803 | btrfs_init_workers(&fs_info->endio_workers, "endio", |
61d92c32 CM |
1804 | fs_info->thread_pool_size, |
1805 | &fs_info->generic_worker); | |
d20f7043 | 1806 | btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta", |
61d92c32 CM |
1807 | fs_info->thread_pool_size, |
1808 | &fs_info->generic_worker); | |
cad321ad | 1809 | btrfs_init_workers(&fs_info->endio_meta_write_workers, |
61d92c32 CM |
1810 | "endio-meta-write", fs_info->thread_pool_size, |
1811 | &fs_info->generic_worker); | |
5443be45 | 1812 | btrfs_init_workers(&fs_info->endio_write_workers, "endio-write", |
61d92c32 CM |
1813 | fs_info->thread_pool_size, |
1814 | &fs_info->generic_worker); | |
0cb59c99 JB |
1815 | btrfs_init_workers(&fs_info->endio_freespace_worker, "freespace-write", |
1816 | 1, &fs_info->generic_worker); | |
61b49440 CM |
1817 | |
1818 | /* | |
1819 | * endios are largely parallel and should have a very | |
1820 | * low idle thresh | |
1821 | */ | |
1822 | fs_info->endio_workers.idle_thresh = 4; | |
b51912c9 CM |
1823 | fs_info->endio_meta_workers.idle_thresh = 4; |
1824 | ||
9042846b CM |
1825 | fs_info->endio_write_workers.idle_thresh = 2; |
1826 | fs_info->endio_meta_write_workers.idle_thresh = 2; | |
1827 | ||
4543df7e | 1828 | btrfs_start_workers(&fs_info->workers, 1); |
61d92c32 | 1829 | btrfs_start_workers(&fs_info->generic_worker, 1); |
1cc127b5 | 1830 | btrfs_start_workers(&fs_info->submit_workers, 1); |
771ed689 | 1831 | btrfs_start_workers(&fs_info->delalloc_workers, 1); |
247e743c | 1832 | btrfs_start_workers(&fs_info->fixup_workers, 1); |
9042846b CM |
1833 | btrfs_start_workers(&fs_info->endio_workers, 1); |
1834 | btrfs_start_workers(&fs_info->endio_meta_workers, 1); | |
1835 | btrfs_start_workers(&fs_info->endio_meta_write_workers, 1); | |
1836 | btrfs_start_workers(&fs_info->endio_write_workers, 1); | |
0cb59c99 | 1837 | btrfs_start_workers(&fs_info->endio_freespace_worker, 1); |
4543df7e | 1838 | |
4575c9cc | 1839 | fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); |
c8b97818 CM |
1840 | fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, |
1841 | 4 * 1024 * 1024 / PAGE_CACHE_SIZE); | |
4575c9cc | 1842 | |
db94535d CM |
1843 | nodesize = btrfs_super_nodesize(disk_super); |
1844 | leafsize = btrfs_super_leafsize(disk_super); | |
1845 | sectorsize = btrfs_super_sectorsize(disk_super); | |
87ee04eb | 1846 | stripesize = btrfs_super_stripesize(disk_super); |
db94535d CM |
1847 | tree_root->nodesize = nodesize; |
1848 | tree_root->leafsize = leafsize; | |
1849 | tree_root->sectorsize = sectorsize; | |
87ee04eb | 1850 | tree_root->stripesize = stripesize; |
a061fc8d CM |
1851 | |
1852 | sb->s_blocksize = sectorsize; | |
1853 | sb->s_blocksize_bits = blksize_bits(sectorsize); | |
db94535d | 1854 | |
39279cc3 CM |
1855 | if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, |
1856 | sizeof(disk_super->magic))) { | |
d397712b | 1857 | printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id); |
39279cc3 CM |
1858 | goto fail_sb_buffer; |
1859 | } | |
19c00ddc | 1860 | |
925baedd | 1861 | mutex_lock(&fs_info->chunk_mutex); |
e4404d6e | 1862 | ret = btrfs_read_sys_array(tree_root); |
925baedd | 1863 | mutex_unlock(&fs_info->chunk_mutex); |
84eed90f | 1864 | if (ret) { |
d397712b CM |
1865 | printk(KERN_WARNING "btrfs: failed to read the system " |
1866 | "array on %s\n", sb->s_id); | |
5d4f98a2 | 1867 | goto fail_sb_buffer; |
84eed90f | 1868 | } |
0b86a832 CM |
1869 | |
1870 | blocksize = btrfs_level_size(tree_root, | |
1871 | btrfs_super_chunk_root_level(disk_super)); | |
84234f3a | 1872 | generation = btrfs_super_chunk_root_generation(disk_super); |
0b86a832 CM |
1873 | |
1874 | __setup_root(nodesize, leafsize, sectorsize, stripesize, | |
1875 | chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); | |
1876 | ||
1877 | chunk_root->node = read_tree_block(chunk_root, | |
1878 | btrfs_super_chunk_root(disk_super), | |
84234f3a | 1879 | blocksize, generation); |
0b86a832 | 1880 | BUG_ON(!chunk_root->node); |
83121942 DW |
1881 | if (!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) { |
1882 | printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n", | |
1883 | sb->s_id); | |
1884 | goto fail_chunk_root; | |
1885 | } | |
5d4f98a2 YZ |
1886 | btrfs_set_root_node(&chunk_root->root_item, chunk_root->node); |
1887 | chunk_root->commit_root = btrfs_root_node(chunk_root); | |
0b86a832 | 1888 | |
e17cade2 | 1889 | read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, |
d397712b CM |
1890 | (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node), |
1891 | BTRFS_UUID_SIZE); | |
e17cade2 | 1892 | |
925baedd | 1893 | mutex_lock(&fs_info->chunk_mutex); |
0b86a832 | 1894 | ret = btrfs_read_chunk_tree(chunk_root); |
925baedd | 1895 | mutex_unlock(&fs_info->chunk_mutex); |
2b82032c | 1896 | if (ret) { |
d397712b CM |
1897 | printk(KERN_WARNING "btrfs: failed to read chunk tree on %s\n", |
1898 | sb->s_id); | |
2b82032c YZ |
1899 | goto fail_chunk_root; |
1900 | } | |
0b86a832 | 1901 | |
dfe25020 CM |
1902 | btrfs_close_extra_devices(fs_devices); |
1903 | ||
db94535d CM |
1904 | blocksize = btrfs_level_size(tree_root, |
1905 | btrfs_super_root_level(disk_super)); | |
84234f3a | 1906 | generation = btrfs_super_generation(disk_super); |
0b86a832 | 1907 | |
e20d96d6 | 1908 | tree_root->node = read_tree_block(tree_root, |
db94535d | 1909 | btrfs_super_root(disk_super), |
84234f3a | 1910 | blocksize, generation); |
39279cc3 | 1911 | if (!tree_root->node) |
2b82032c | 1912 | goto fail_chunk_root; |
83121942 DW |
1913 | if (!test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) { |
1914 | printk(KERN_WARNING "btrfs: failed to read tree root on %s\n", | |
1915 | sb->s_id); | |
1916 | goto fail_tree_root; | |
1917 | } | |
5d4f98a2 YZ |
1918 | btrfs_set_root_node(&tree_root->root_item, tree_root->node); |
1919 | tree_root->commit_root = btrfs_root_node(tree_root); | |
db94535d CM |
1920 | |
1921 | ret = find_and_setup_root(tree_root, fs_info, | |
e20d96d6 | 1922 | BTRFS_EXTENT_TREE_OBJECTID, extent_root); |
0b86a832 | 1923 | if (ret) |
39279cc3 | 1924 | goto fail_tree_root; |
0b86a832 CM |
1925 | extent_root->track_dirty = 1; |
1926 | ||
1927 | ret = find_and_setup_root(tree_root, fs_info, | |
1928 | BTRFS_DEV_TREE_OBJECTID, dev_root); | |
0b86a832 CM |
1929 | if (ret) |
1930 | goto fail_extent_root; | |
5d4f98a2 | 1931 | dev_root->track_dirty = 1; |
3768f368 | 1932 | |
d20f7043 CM |
1933 | ret = find_and_setup_root(tree_root, fs_info, |
1934 | BTRFS_CSUM_TREE_OBJECTID, csum_root); | |
1935 | if (ret) | |
5d4f98a2 | 1936 | goto fail_dev_root; |
d20f7043 CM |
1937 | |
1938 | csum_root->track_dirty = 1; | |
1939 | ||
8929ecfa YZ |
1940 | fs_info->generation = generation; |
1941 | fs_info->last_trans_committed = generation; | |
1942 | fs_info->data_alloc_profile = (u64)-1; | |
1943 | fs_info->metadata_alloc_profile = (u64)-1; | |
1944 | fs_info->system_alloc_profile = fs_info->metadata_alloc_profile; | |
1945 | ||
1b1d1f66 JB |
1946 | ret = btrfs_read_block_groups(extent_root); |
1947 | if (ret) { | |
1948 | printk(KERN_ERR "Failed to read block groups: %d\n", ret); | |
1949 | goto fail_block_groups; | |
1950 | } | |
9078a3e1 | 1951 | |
a74a4b97 CM |
1952 | fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, |
1953 | "btrfs-cleaner"); | |
57506d50 | 1954 | if (IS_ERR(fs_info->cleaner_kthread)) |
1b1d1f66 | 1955 | goto fail_block_groups; |
a74a4b97 CM |
1956 | |
1957 | fs_info->transaction_kthread = kthread_run(transaction_kthread, | |
1958 | tree_root, | |
1959 | "btrfs-transaction"); | |
57506d50 | 1960 | if (IS_ERR(fs_info->transaction_kthread)) |
3f157a2f | 1961 | goto fail_cleaner; |
a74a4b97 | 1962 | |
c289811c CM |
1963 | if (!btrfs_test_opt(tree_root, SSD) && |
1964 | !btrfs_test_opt(tree_root, NOSSD) && | |
1965 | !fs_info->fs_devices->rotating) { | |
1966 | printk(KERN_INFO "Btrfs detected SSD devices, enabling SSD " | |
1967 | "mode\n"); | |
1968 | btrfs_set_opt(fs_info->mount_opt, SSD); | |
1969 | } | |
1970 | ||
e02119d5 | 1971 | if (btrfs_super_log_root(disk_super) != 0) { |
e02119d5 CM |
1972 | u64 bytenr = btrfs_super_log_root(disk_super); |
1973 | ||
7c2ca468 | 1974 | if (fs_devices->rw_devices == 0) { |
d397712b CM |
1975 | printk(KERN_WARNING "Btrfs log replay required " |
1976 | "on RO media\n"); | |
7c2ca468 CM |
1977 | err = -EIO; |
1978 | goto fail_trans_kthread; | |
1979 | } | |
e02119d5 CM |
1980 | blocksize = |
1981 | btrfs_level_size(tree_root, | |
1982 | btrfs_super_log_root_level(disk_super)); | |
d18a2c44 | 1983 | |
676e4c86 DC |
1984 | log_tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS); |
1985 | if (!log_tree_root) { | |
1986 | err = -ENOMEM; | |
1987 | goto fail_trans_kthread; | |
1988 | } | |
e02119d5 CM |
1989 | |
1990 | __setup_root(nodesize, leafsize, sectorsize, stripesize, | |
1991 | log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID); | |
1992 | ||
1993 | log_tree_root->node = read_tree_block(tree_root, bytenr, | |
84234f3a YZ |
1994 | blocksize, |
1995 | generation + 1); | |
e02119d5 CM |
1996 | ret = btrfs_recover_log_trees(log_tree_root); |
1997 | BUG_ON(ret); | |
e556ce2c YZ |
1998 | |
1999 | if (sb->s_flags & MS_RDONLY) { | |
2000 | ret = btrfs_commit_super(tree_root); | |
2001 | BUG_ON(ret); | |
2002 | } | |
e02119d5 | 2003 | } |
1a40e23b | 2004 | |
76dda93c YZ |
2005 | ret = btrfs_find_orphan_roots(tree_root); |
2006 | BUG_ON(ret); | |
2007 | ||
7c2ca468 | 2008 | if (!(sb->s_flags & MS_RDONLY)) { |
d68fc57b YZ |
2009 | ret = btrfs_cleanup_fs_roots(fs_info); |
2010 | BUG_ON(ret); | |
2011 | ||
5d4f98a2 | 2012 | ret = btrfs_recover_relocation(tree_root); |
d7ce5843 MX |
2013 | if (ret < 0) { |
2014 | printk(KERN_WARNING | |
2015 | "btrfs: failed to recover relocation\n"); | |
2016 | err = -EINVAL; | |
2017 | goto fail_trans_kthread; | |
2018 | } | |
7c2ca468 | 2019 | } |
1a40e23b | 2020 | |
3de4586c CM |
2021 | location.objectid = BTRFS_FS_TREE_OBJECTID; |
2022 | location.type = BTRFS_ROOT_ITEM_KEY; | |
2023 | location.offset = (u64)-1; | |
2024 | ||
3de4586c CM |
2025 | fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); |
2026 | if (!fs_info->fs_root) | |
7c2ca468 | 2027 | goto fail_trans_kthread; |
3140c9a3 DC |
2028 | if (IS_ERR(fs_info->fs_root)) { |
2029 | err = PTR_ERR(fs_info->fs_root); | |
2030 | goto fail_trans_kthread; | |
2031 | } | |
c289811c | 2032 | |
e3acc2a6 JB |
2033 | if (!(sb->s_flags & MS_RDONLY)) { |
2034 | down_read(&fs_info->cleanup_work_sem); | |
2035 | btrfs_orphan_cleanup(fs_info->fs_root); | |
0af3d00b | 2036 | btrfs_orphan_cleanup(fs_info->tree_root); |
e3acc2a6 JB |
2037 | up_read(&fs_info->cleanup_work_sem); |
2038 | } | |
2039 | ||
0f7d52f4 | 2040 | return tree_root; |
39279cc3 | 2041 | |
7c2ca468 CM |
2042 | fail_trans_kthread: |
2043 | kthread_stop(fs_info->transaction_kthread); | |
3f157a2f | 2044 | fail_cleaner: |
a74a4b97 | 2045 | kthread_stop(fs_info->cleaner_kthread); |
7c2ca468 CM |
2046 | |
2047 | /* | |
2048 | * make sure we're done with the btree inode before we stop our | |
2049 | * kthreads | |
2050 | */ | |
2051 | filemap_write_and_wait(fs_info->btree_inode->i_mapping); | |
2052 | invalidate_inode_pages2(fs_info->btree_inode->i_mapping); | |
2053 | ||
1b1d1f66 JB |
2054 | fail_block_groups: |
2055 | btrfs_free_block_groups(fs_info); | |
d20f7043 | 2056 | free_extent_buffer(csum_root->node); |
5d4f98a2 YZ |
2057 | free_extent_buffer(csum_root->commit_root); |
2058 | fail_dev_root: | |
2059 | free_extent_buffer(dev_root->node); | |
2060 | free_extent_buffer(dev_root->commit_root); | |
0b86a832 CM |
2061 | fail_extent_root: |
2062 | free_extent_buffer(extent_root->node); | |
5d4f98a2 | 2063 | free_extent_buffer(extent_root->commit_root); |
39279cc3 | 2064 | fail_tree_root: |
5f39d397 | 2065 | free_extent_buffer(tree_root->node); |
5d4f98a2 | 2066 | free_extent_buffer(tree_root->commit_root); |
2b82032c YZ |
2067 | fail_chunk_root: |
2068 | free_extent_buffer(chunk_root->node); | |
5d4f98a2 | 2069 | free_extent_buffer(chunk_root->commit_root); |
39279cc3 | 2070 | fail_sb_buffer: |
61d92c32 | 2071 | btrfs_stop_workers(&fs_info->generic_worker); |
247e743c | 2072 | btrfs_stop_workers(&fs_info->fixup_workers); |
771ed689 | 2073 | btrfs_stop_workers(&fs_info->delalloc_workers); |
8b712842 CM |
2074 | btrfs_stop_workers(&fs_info->workers); |
2075 | btrfs_stop_workers(&fs_info->endio_workers); | |
d20f7043 | 2076 | btrfs_stop_workers(&fs_info->endio_meta_workers); |
cad321ad | 2077 | btrfs_stop_workers(&fs_info->endio_meta_write_workers); |
e6dcd2dc | 2078 | btrfs_stop_workers(&fs_info->endio_write_workers); |
0cb59c99 | 2079 | btrfs_stop_workers(&fs_info->endio_freespace_worker); |
1cc127b5 | 2080 | btrfs_stop_workers(&fs_info->submit_workers); |
4543df7e | 2081 | fail_iput: |
7c2ca468 | 2082 | invalidate_inode_pages2(fs_info->btree_inode->i_mapping); |
4543df7e | 2083 | iput(fs_info->btree_inode); |
7e662854 | 2084 | |
dfe25020 | 2085 | btrfs_close_devices(fs_info->fs_devices); |
84eed90f | 2086 | btrfs_mapping_tree_free(&fs_info->mapping_tree); |
ad081f14 | 2087 | fail_bdi: |
7e662854 | 2088 | bdi_destroy(&fs_info->bdi); |
76dda93c YZ |
2089 | fail_srcu: |
2090 | cleanup_srcu_struct(&fs_info->subvol_srcu); | |
7e662854 | 2091 | fail: |
39279cc3 CM |
2092 | kfree(extent_root); |
2093 | kfree(tree_root); | |
2094 | kfree(fs_info); | |
83afeac4 JM |
2095 | kfree(chunk_root); |
2096 | kfree(dev_root); | |
d20f7043 | 2097 | kfree(csum_root); |
39279cc3 | 2098 | return ERR_PTR(err); |
eb60ceac CM |
2099 | } |
2100 | ||
f2984462 CM |
2101 | static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) |
2102 | { | |
2103 | char b[BDEVNAME_SIZE]; | |
2104 | ||
2105 | if (uptodate) { | |
2106 | set_buffer_uptodate(bh); | |
2107 | } else { | |
2108 | if (!buffer_eopnotsupp(bh) && printk_ratelimit()) { | |
2109 | printk(KERN_WARNING "lost page write due to " | |
2110 | "I/O error on %s\n", | |
2111 | bdevname(bh->b_bdev, b)); | |
2112 | } | |
1259ab75 CM |
2113 | /* note, we dont' set_buffer_write_io_error because we have |
2114 | * our own ways of dealing with the IO errors | |
2115 | */ | |
f2984462 CM |
2116 | clear_buffer_uptodate(bh); |
2117 | } | |
2118 | unlock_buffer(bh); | |
2119 | put_bh(bh); | |
2120 | } | |
2121 | ||
a512bbf8 YZ |
2122 | struct buffer_head *btrfs_read_dev_super(struct block_device *bdev) |
2123 | { | |
2124 | struct buffer_head *bh; | |
2125 | struct buffer_head *latest = NULL; | |
2126 | struct btrfs_super_block *super; | |
2127 | int i; | |
2128 | u64 transid = 0; | |
2129 | u64 bytenr; | |
2130 | ||
2131 | /* we would like to check all the supers, but that would make | |
2132 | * a btrfs mount succeed after a mkfs from a different FS. | |
2133 | * So, we need to add a special mount option to scan for | |
2134 | * later supers, using BTRFS_SUPER_MIRROR_MAX instead | |
2135 | */ | |
2136 | for (i = 0; i < 1; i++) { | |
2137 | bytenr = btrfs_sb_offset(i); | |
2138 | if (bytenr + 4096 >= i_size_read(bdev->bd_inode)) | |
2139 | break; | |
2140 | bh = __bread(bdev, bytenr / 4096, 4096); | |
2141 | if (!bh) | |
2142 | continue; | |
2143 | ||
2144 | super = (struct btrfs_super_block *)bh->b_data; | |
2145 | if (btrfs_super_bytenr(super) != bytenr || | |
2146 | strncmp((char *)(&super->magic), BTRFS_MAGIC, | |
2147 | sizeof(super->magic))) { | |
2148 | brelse(bh); | |
2149 | continue; | |
2150 | } | |
2151 | ||
2152 | if (!latest || btrfs_super_generation(super) > transid) { | |
2153 | brelse(latest); | |
2154 | latest = bh; | |
2155 | transid = btrfs_super_generation(super); | |
2156 | } else { | |
2157 | brelse(bh); | |
2158 | } | |
2159 | } | |
2160 | return latest; | |
2161 | } | |
2162 | ||
4eedeb75 HH |
2163 | /* |
2164 | * this should be called twice, once with wait == 0 and | |
2165 | * once with wait == 1. When wait == 0 is done, all the buffer heads | |
2166 | * we write are pinned. | |
2167 | * | |
2168 | * They are released when wait == 1 is done. | |
2169 | * max_mirrors must be the same for both runs, and it indicates how | |
2170 | * many supers on this one device should be written. | |
2171 | * | |
2172 | * max_mirrors == 0 means to write them all. | |
2173 | */ | |
a512bbf8 YZ |
2174 | static int write_dev_supers(struct btrfs_device *device, |
2175 | struct btrfs_super_block *sb, | |
2176 | int do_barriers, int wait, int max_mirrors) | |
2177 | { | |
2178 | struct buffer_head *bh; | |
2179 | int i; | |
2180 | int ret; | |
2181 | int errors = 0; | |
2182 | u32 crc; | |
2183 | u64 bytenr; | |
2184 | int last_barrier = 0; | |
2185 | ||
2186 | if (max_mirrors == 0) | |
2187 | max_mirrors = BTRFS_SUPER_MIRROR_MAX; | |
2188 | ||
2189 | /* make sure only the last submit_bh does a barrier */ | |
2190 | if (do_barriers) { | |
2191 | for (i = 0; i < max_mirrors; i++) { | |
2192 | bytenr = btrfs_sb_offset(i); | |
2193 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= | |
2194 | device->total_bytes) | |
2195 | break; | |
2196 | last_barrier = i; | |
2197 | } | |
2198 | } | |
2199 | ||
2200 | for (i = 0; i < max_mirrors; i++) { | |
2201 | bytenr = btrfs_sb_offset(i); | |
2202 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes) | |
2203 | break; | |
2204 | ||
2205 | if (wait) { | |
2206 | bh = __find_get_block(device->bdev, bytenr / 4096, | |
2207 | BTRFS_SUPER_INFO_SIZE); | |
2208 | BUG_ON(!bh); | |
a512bbf8 | 2209 | wait_on_buffer(bh); |
4eedeb75 HH |
2210 | if (!buffer_uptodate(bh)) |
2211 | errors++; | |
2212 | ||
2213 | /* drop our reference */ | |
2214 | brelse(bh); | |
2215 | ||
2216 | /* drop the reference from the wait == 0 run */ | |
2217 | brelse(bh); | |
2218 | continue; | |
a512bbf8 YZ |
2219 | } else { |
2220 | btrfs_set_super_bytenr(sb, bytenr); | |
2221 | ||
2222 | crc = ~(u32)0; | |
2223 | crc = btrfs_csum_data(NULL, (char *)sb + | |
2224 | BTRFS_CSUM_SIZE, crc, | |
2225 | BTRFS_SUPER_INFO_SIZE - | |
2226 | BTRFS_CSUM_SIZE); | |
2227 | btrfs_csum_final(crc, sb->csum); | |
2228 | ||
4eedeb75 HH |
2229 | /* |
2230 | * one reference for us, and we leave it for the | |
2231 | * caller | |
2232 | */ | |
a512bbf8 YZ |
2233 | bh = __getblk(device->bdev, bytenr / 4096, |
2234 | BTRFS_SUPER_INFO_SIZE); | |
2235 | memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); | |
2236 | ||
4eedeb75 | 2237 | /* one reference for submit_bh */ |
a512bbf8 | 2238 | get_bh(bh); |
4eedeb75 HH |
2239 | |
2240 | set_buffer_uptodate(bh); | |
a512bbf8 YZ |
2241 | lock_buffer(bh); |
2242 | bh->b_end_io = btrfs_end_buffer_write_sync; | |
2243 | } | |
2244 | ||
2245 | if (i == last_barrier && do_barriers && device->barriers) { | |
2246 | ret = submit_bh(WRITE_BARRIER, bh); | |
2247 | if (ret == -EOPNOTSUPP) { | |
2248 | printk("btrfs: disabling barriers on dev %s\n", | |
2249 | device->name); | |
2250 | set_buffer_uptodate(bh); | |
2251 | device->barriers = 0; | |
4eedeb75 | 2252 | /* one reference for submit_bh */ |
a512bbf8 YZ |
2253 | get_bh(bh); |
2254 | lock_buffer(bh); | |
ffbd517d | 2255 | ret = submit_bh(WRITE_SYNC, bh); |
a512bbf8 YZ |
2256 | } |
2257 | } else { | |
ffbd517d | 2258 | ret = submit_bh(WRITE_SYNC, bh); |
a512bbf8 YZ |
2259 | } |
2260 | ||
4eedeb75 | 2261 | if (ret) |
a512bbf8 | 2262 | errors++; |
a512bbf8 YZ |
2263 | } |
2264 | return errors < i ? 0 : -1; | |
2265 | } | |
2266 | ||
2267 | int write_all_supers(struct btrfs_root *root, int max_mirrors) | |
f2984462 | 2268 | { |
e5e9a520 | 2269 | struct list_head *head; |
f2984462 | 2270 | struct btrfs_device *dev; |
a061fc8d | 2271 | struct btrfs_super_block *sb; |
f2984462 | 2272 | struct btrfs_dev_item *dev_item; |
f2984462 CM |
2273 | int ret; |
2274 | int do_barriers; | |
a236aed1 CM |
2275 | int max_errors; |
2276 | int total_errors = 0; | |
a061fc8d | 2277 | u64 flags; |
f2984462 | 2278 | |
a236aed1 | 2279 | max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; |
f2984462 CM |
2280 | do_barriers = !btrfs_test_opt(root, NOBARRIER); |
2281 | ||
a061fc8d CM |
2282 | sb = &root->fs_info->super_for_commit; |
2283 | dev_item = &sb->dev_item; | |
e5e9a520 CM |
2284 | |
2285 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
2286 | head = &root->fs_info->fs_devices->devices; | |
c6e30871 | 2287 | list_for_each_entry(dev, head, dev_list) { |
dfe25020 CM |
2288 | if (!dev->bdev) { |
2289 | total_errors++; | |
2290 | continue; | |
2291 | } | |
2b82032c | 2292 | if (!dev->in_fs_metadata || !dev->writeable) |
dfe25020 CM |
2293 | continue; |
2294 | ||
2b82032c | 2295 | btrfs_set_stack_device_generation(dev_item, 0); |
a061fc8d CM |
2296 | btrfs_set_stack_device_type(dev_item, dev->type); |
2297 | btrfs_set_stack_device_id(dev_item, dev->devid); | |
2298 | btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); | |
2299 | btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); | |
2300 | btrfs_set_stack_device_io_align(dev_item, dev->io_align); | |
2301 | btrfs_set_stack_device_io_width(dev_item, dev->io_width); | |
2302 | btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); | |
2303 | memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); | |
2b82032c | 2304 | memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); |
a512bbf8 | 2305 | |
a061fc8d CM |
2306 | flags = btrfs_super_flags(sb); |
2307 | btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); | |
2308 | ||
a512bbf8 | 2309 | ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors); |
a236aed1 CM |
2310 | if (ret) |
2311 | total_errors++; | |
f2984462 | 2312 | } |
a236aed1 | 2313 | if (total_errors > max_errors) { |
d397712b CM |
2314 | printk(KERN_ERR "btrfs: %d errors while writing supers\n", |
2315 | total_errors); | |
a236aed1 CM |
2316 | BUG(); |
2317 | } | |
f2984462 | 2318 | |
a512bbf8 | 2319 | total_errors = 0; |
c6e30871 | 2320 | list_for_each_entry(dev, head, dev_list) { |
dfe25020 CM |
2321 | if (!dev->bdev) |
2322 | continue; | |
2b82032c | 2323 | if (!dev->in_fs_metadata || !dev->writeable) |
dfe25020 CM |
2324 | continue; |
2325 | ||
a512bbf8 YZ |
2326 | ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors); |
2327 | if (ret) | |
2328 | total_errors++; | |
f2984462 | 2329 | } |
e5e9a520 | 2330 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
a236aed1 | 2331 | if (total_errors > max_errors) { |
d397712b CM |
2332 | printk(KERN_ERR "btrfs: %d errors while writing supers\n", |
2333 | total_errors); | |
a236aed1 CM |
2334 | BUG(); |
2335 | } | |
f2984462 CM |
2336 | return 0; |
2337 | } | |
2338 | ||
a512bbf8 YZ |
2339 | int write_ctree_super(struct btrfs_trans_handle *trans, |
2340 | struct btrfs_root *root, int max_mirrors) | |
eb60ceac | 2341 | { |
e66f709b | 2342 | int ret; |
5f39d397 | 2343 | |
a512bbf8 | 2344 | ret = write_all_supers(root, max_mirrors); |
5f39d397 | 2345 | return ret; |
cfaa7295 CM |
2346 | } |
2347 | ||
5eda7b5e | 2348 | int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) |
2619ba1f | 2349 | { |
4df27c4d | 2350 | spin_lock(&fs_info->fs_roots_radix_lock); |
2619ba1f CM |
2351 | radix_tree_delete(&fs_info->fs_roots_radix, |
2352 | (unsigned long)root->root_key.objectid); | |
4df27c4d | 2353 | spin_unlock(&fs_info->fs_roots_radix_lock); |
76dda93c YZ |
2354 | |
2355 | if (btrfs_root_refs(&root->root_item) == 0) | |
2356 | synchronize_srcu(&fs_info->subvol_srcu); | |
2357 | ||
4df27c4d YZ |
2358 | free_fs_root(root); |
2359 | return 0; | |
2360 | } | |
2361 | ||
2362 | static void free_fs_root(struct btrfs_root *root) | |
2363 | { | |
2364 | WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree)); | |
3394e160 CM |
2365 | if (root->anon_super.s_dev) { |
2366 | down_write(&root->anon_super.s_umount); | |
2367 | kill_anon_super(&root->anon_super); | |
2368 | } | |
4df27c4d YZ |
2369 | free_extent_buffer(root->node); |
2370 | free_extent_buffer(root->commit_root); | |
d397712b | 2371 | kfree(root->name); |
2619ba1f | 2372 | kfree(root); |
2619ba1f CM |
2373 | } |
2374 | ||
35b7e476 | 2375 | static int del_fs_roots(struct btrfs_fs_info *fs_info) |
0f7d52f4 CM |
2376 | { |
2377 | int ret; | |
2378 | struct btrfs_root *gang[8]; | |
2379 | int i; | |
2380 | ||
76dda93c YZ |
2381 | while (!list_empty(&fs_info->dead_roots)) { |
2382 | gang[0] = list_entry(fs_info->dead_roots.next, | |
2383 | struct btrfs_root, root_list); | |
2384 | list_del(&gang[0]->root_list); | |
2385 | ||
2386 | if (gang[0]->in_radix) { | |
2387 | btrfs_free_fs_root(fs_info, gang[0]); | |
2388 | } else { | |
2389 | free_extent_buffer(gang[0]->node); | |
2390 | free_extent_buffer(gang[0]->commit_root); | |
2391 | kfree(gang[0]); | |
2392 | } | |
2393 | } | |
2394 | ||
d397712b | 2395 | while (1) { |
0f7d52f4 CM |
2396 | ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, |
2397 | (void **)gang, 0, | |
2398 | ARRAY_SIZE(gang)); | |
2399 | if (!ret) | |
2400 | break; | |
2619ba1f | 2401 | for (i = 0; i < ret; i++) |
5eda7b5e | 2402 | btrfs_free_fs_root(fs_info, gang[i]); |
0f7d52f4 CM |
2403 | } |
2404 | return 0; | |
2405 | } | |
b4100d64 | 2406 | |
c146afad | 2407 | int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) |
cfaa7295 | 2408 | { |
c146afad YZ |
2409 | u64 root_objectid = 0; |
2410 | struct btrfs_root *gang[8]; | |
2411 | int i; | |
3768f368 | 2412 | int ret; |
e089f05c | 2413 | |
c146afad YZ |
2414 | while (1) { |
2415 | ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, | |
2416 | (void **)gang, root_objectid, | |
2417 | ARRAY_SIZE(gang)); | |
2418 | if (!ret) | |
2419 | break; | |
5d4f98a2 YZ |
2420 | |
2421 | root_objectid = gang[ret - 1]->root_key.objectid + 1; | |
c146afad YZ |
2422 | for (i = 0; i < ret; i++) { |
2423 | root_objectid = gang[i]->root_key.objectid; | |
c146afad YZ |
2424 | btrfs_orphan_cleanup(gang[i]); |
2425 | } | |
2426 | root_objectid++; | |
2427 | } | |
2428 | return 0; | |
2429 | } | |
a2135011 | 2430 | |
c146afad YZ |
2431 | int btrfs_commit_super(struct btrfs_root *root) |
2432 | { | |
2433 | struct btrfs_trans_handle *trans; | |
2434 | int ret; | |
a74a4b97 | 2435 | |
c146afad | 2436 | mutex_lock(&root->fs_info->cleaner_mutex); |
24bbcf04 | 2437 | btrfs_run_delayed_iputs(root); |
a74a4b97 | 2438 | btrfs_clean_old_snapshots(root); |
c146afad | 2439 | mutex_unlock(&root->fs_info->cleaner_mutex); |
c71bf099 YZ |
2440 | |
2441 | /* wait until ongoing cleanup work done */ | |
2442 | down_write(&root->fs_info->cleanup_work_sem); | |
2443 | up_write(&root->fs_info->cleanup_work_sem); | |
2444 | ||
a22285a6 | 2445 | trans = btrfs_join_transaction(root, 1); |
54aa1f4d | 2446 | ret = btrfs_commit_transaction(trans, root); |
c146afad YZ |
2447 | BUG_ON(ret); |
2448 | /* run commit again to drop the original snapshot */ | |
a22285a6 | 2449 | trans = btrfs_join_transaction(root, 1); |
79154b1b CM |
2450 | btrfs_commit_transaction(trans, root); |
2451 | ret = btrfs_write_and_wait_transaction(NULL, root); | |
3768f368 | 2452 | BUG_ON(ret); |
d6bfde87 | 2453 | |
a512bbf8 | 2454 | ret = write_ctree_super(NULL, root, 0); |
c146afad YZ |
2455 | return ret; |
2456 | } | |
2457 | ||
2458 | int close_ctree(struct btrfs_root *root) | |
2459 | { | |
2460 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2461 | int ret; | |
2462 | ||
2463 | fs_info->closing = 1; | |
2464 | smp_mb(); | |
2465 | ||
0af3d00b | 2466 | btrfs_put_block_group_cache(fs_info); |
c146afad YZ |
2467 | if (!(fs_info->sb->s_flags & MS_RDONLY)) { |
2468 | ret = btrfs_commit_super(root); | |
d397712b CM |
2469 | if (ret) |
2470 | printk(KERN_ERR "btrfs: commit super ret %d\n", ret); | |
c146afad | 2471 | } |
0f7d52f4 | 2472 | |
8929ecfa YZ |
2473 | kthread_stop(root->fs_info->transaction_kthread); |
2474 | kthread_stop(root->fs_info->cleaner_kthread); | |
2475 | ||
f25784b3 YZ |
2476 | fs_info->closing = 2; |
2477 | smp_mb(); | |
2478 | ||
b0c68f8b | 2479 | if (fs_info->delalloc_bytes) { |
d397712b | 2480 | printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n", |
21380931 | 2481 | (unsigned long long)fs_info->delalloc_bytes); |
b0c68f8b | 2482 | } |
31153d81 | 2483 | if (fs_info->total_ref_cache_size) { |
d397712b CM |
2484 | printk(KERN_INFO "btrfs: at umount reference cache size %llu\n", |
2485 | (unsigned long long)fs_info->total_ref_cache_size); | |
31153d81 | 2486 | } |
bcc63abb | 2487 | |
5d4f98a2 YZ |
2488 | free_extent_buffer(fs_info->extent_root->node); |
2489 | free_extent_buffer(fs_info->extent_root->commit_root); | |
2490 | free_extent_buffer(fs_info->tree_root->node); | |
2491 | free_extent_buffer(fs_info->tree_root->commit_root); | |
2492 | free_extent_buffer(root->fs_info->chunk_root->node); | |
2493 | free_extent_buffer(root->fs_info->chunk_root->commit_root); | |
2494 | free_extent_buffer(root->fs_info->dev_root->node); | |
2495 | free_extent_buffer(root->fs_info->dev_root->commit_root); | |
2496 | free_extent_buffer(root->fs_info->csum_root->node); | |
2497 | free_extent_buffer(root->fs_info->csum_root->commit_root); | |
d20f7043 | 2498 | |
9078a3e1 | 2499 | btrfs_free_block_groups(root->fs_info); |
d10c5f31 | 2500 | |
c146afad | 2501 | del_fs_roots(fs_info); |
d10c5f31 | 2502 | |
c146afad | 2503 | iput(fs_info->btree_inode); |
9ad6b7bc | 2504 | |
61d92c32 | 2505 | btrfs_stop_workers(&fs_info->generic_worker); |
247e743c | 2506 | btrfs_stop_workers(&fs_info->fixup_workers); |
771ed689 | 2507 | btrfs_stop_workers(&fs_info->delalloc_workers); |
8b712842 CM |
2508 | btrfs_stop_workers(&fs_info->workers); |
2509 | btrfs_stop_workers(&fs_info->endio_workers); | |
d20f7043 | 2510 | btrfs_stop_workers(&fs_info->endio_meta_workers); |
cad321ad | 2511 | btrfs_stop_workers(&fs_info->endio_meta_write_workers); |
e6dcd2dc | 2512 | btrfs_stop_workers(&fs_info->endio_write_workers); |
0cb59c99 | 2513 | btrfs_stop_workers(&fs_info->endio_freespace_worker); |
1cc127b5 | 2514 | btrfs_stop_workers(&fs_info->submit_workers); |
d6bfde87 | 2515 | |
dfe25020 | 2516 | btrfs_close_devices(fs_info->fs_devices); |
0b86a832 | 2517 | btrfs_mapping_tree_free(&fs_info->mapping_tree); |
b248a415 | 2518 | |
04160088 | 2519 | bdi_destroy(&fs_info->bdi); |
76dda93c | 2520 | cleanup_srcu_struct(&fs_info->subvol_srcu); |
0b86a832 | 2521 | |
0f7d52f4 | 2522 | kfree(fs_info->extent_root); |
0f7d52f4 | 2523 | kfree(fs_info->tree_root); |
0b86a832 CM |
2524 | kfree(fs_info->chunk_root); |
2525 | kfree(fs_info->dev_root); | |
d20f7043 | 2526 | kfree(fs_info->csum_root); |
eb60ceac CM |
2527 | return 0; |
2528 | } | |
2529 | ||
1259ab75 | 2530 | int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) |
5f39d397 | 2531 | { |
1259ab75 | 2532 | int ret; |
810191ff | 2533 | struct inode *btree_inode = buf->first_page->mapping->host; |
1259ab75 | 2534 | |
2ac55d41 JB |
2535 | ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf, |
2536 | NULL); | |
1259ab75 CM |
2537 | if (!ret) |
2538 | return ret; | |
2539 | ||
2540 | ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, | |
2541 | parent_transid); | |
2542 | return !ret; | |
5f39d397 CM |
2543 | } |
2544 | ||
2545 | int btrfs_set_buffer_uptodate(struct extent_buffer *buf) | |
ccd467d6 | 2546 | { |
810191ff | 2547 | struct inode *btree_inode = buf->first_page->mapping->host; |
d1310b2e | 2548 | return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, |
5f39d397 CM |
2549 | buf); |
2550 | } | |
6702ed49 | 2551 | |
5f39d397 CM |
2552 | void btrfs_mark_buffer_dirty(struct extent_buffer *buf) |
2553 | { | |
810191ff | 2554 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
5f39d397 CM |
2555 | u64 transid = btrfs_header_generation(buf); |
2556 | struct inode *btree_inode = root->fs_info->btree_inode; | |
b9473439 | 2557 | int was_dirty; |
b4ce94de | 2558 | |
b9447ef8 | 2559 | btrfs_assert_tree_locked(buf); |
ccd467d6 | 2560 | if (transid != root->fs_info->generation) { |
d397712b CM |
2561 | printk(KERN_CRIT "btrfs transid mismatch buffer %llu, " |
2562 | "found %llu running %llu\n", | |
db94535d | 2563 | (unsigned long long)buf->start, |
d397712b CM |
2564 | (unsigned long long)transid, |
2565 | (unsigned long long)root->fs_info->generation); | |
ccd467d6 CM |
2566 | WARN_ON(1); |
2567 | } | |
b9473439 CM |
2568 | was_dirty = set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, |
2569 | buf); | |
2570 | if (!was_dirty) { | |
2571 | spin_lock(&root->fs_info->delalloc_lock); | |
2572 | root->fs_info->dirty_metadata_bytes += buf->len; | |
2573 | spin_unlock(&root->fs_info->delalloc_lock); | |
2574 | } | |
eb60ceac CM |
2575 | } |
2576 | ||
d3c2fdcf | 2577 | void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) |
35b7e476 | 2578 | { |
188de649 CM |
2579 | /* |
2580 | * looks as though older kernels can get into trouble with | |
2581 | * this code, they end up stuck in balance_dirty_pages forever | |
2582 | */ | |
d6bfde87 | 2583 | u64 num_dirty; |
771ed689 | 2584 | unsigned long thresh = 32 * 1024 * 1024; |
d6bfde87 | 2585 | |
6933c02e | 2586 | if (current->flags & PF_MEMALLOC) |
d6bfde87 CM |
2587 | return; |
2588 | ||
585ad2c3 CM |
2589 | num_dirty = root->fs_info->dirty_metadata_bytes; |
2590 | ||
d6bfde87 CM |
2591 | if (num_dirty > thresh) { |
2592 | balance_dirty_pages_ratelimited_nr( | |
d7fc640e | 2593 | root->fs_info->btree_inode->i_mapping, 1); |
d6bfde87 | 2594 | } |
188de649 | 2595 | return; |
35b7e476 | 2596 | } |
6b80053d | 2597 | |
ca7a79ad | 2598 | int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) |
6b80053d | 2599 | { |
810191ff | 2600 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
ce9adaa5 | 2601 | int ret; |
ca7a79ad | 2602 | ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); |
d397712b | 2603 | if (ret == 0) |
b4ce94de | 2604 | set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); |
ce9adaa5 | 2605 | return ret; |
6b80053d | 2606 | } |
0da5468f | 2607 | |
4bef0848 CM |
2608 | int btree_lock_page_hook(struct page *page) |
2609 | { | |
2610 | struct inode *inode = page->mapping->host; | |
b9473439 | 2611 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4bef0848 CM |
2612 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2613 | struct extent_buffer *eb; | |
2614 | unsigned long len; | |
2615 | u64 bytenr = page_offset(page); | |
2616 | ||
2617 | if (page->private == EXTENT_PAGE_PRIVATE) | |
2618 | goto out; | |
2619 | ||
2620 | len = page->private >> 2; | |
2621 | eb = find_extent_buffer(io_tree, bytenr, len, GFP_NOFS); | |
2622 | if (!eb) | |
2623 | goto out; | |
2624 | ||
2625 | btrfs_tree_lock(eb); | |
4bef0848 | 2626 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
b9473439 CM |
2627 | |
2628 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { | |
2629 | spin_lock(&root->fs_info->delalloc_lock); | |
2630 | if (root->fs_info->dirty_metadata_bytes >= eb->len) | |
2631 | root->fs_info->dirty_metadata_bytes -= eb->len; | |
2632 | else | |
2633 | WARN_ON(1); | |
2634 | spin_unlock(&root->fs_info->delalloc_lock); | |
2635 | } | |
2636 | ||
4bef0848 CM |
2637 | btrfs_tree_unlock(eb); |
2638 | free_extent_buffer(eb); | |
2639 | out: | |
2640 | lock_page(page); | |
2641 | return 0; | |
2642 | } | |
2643 | ||
d1310b2e | 2644 | static struct extent_io_ops btree_extent_io_ops = { |
4bef0848 | 2645 | .write_cache_pages_lock_hook = btree_lock_page_hook, |
ce9adaa5 | 2646 | .readpage_end_io_hook = btree_readpage_end_io_hook, |
0b86a832 | 2647 | .submit_bio_hook = btree_submit_bio_hook, |
239b14b3 CM |
2648 | /* note we're sharing with inode.c for the merge bio hook */ |
2649 | .merge_bio_hook = btrfs_merge_bio_hook, | |
0da5468f | 2650 | }; |