Commit | Line | Data |
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6cbd5570 CM |
1 | /* |
2 | * Copyright (C) 2007 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
e20d96d6 | 19 | #include <linux/fs.h> |
d98237b3 | 20 | #include <linux/blkdev.h> |
87cbda5c | 21 | #include <linux/scatterlist.h> |
22b0ebda | 22 | #include <linux/swap.h> |
0f7d52f4 | 23 | #include <linux/radix-tree.h> |
35b7e476 | 24 | #include <linux/writeback.h> |
d397712b | 25 | #include <linux/buffer_head.h> |
ce9adaa5 | 26 | #include <linux/workqueue.h> |
a74a4b97 | 27 | #include <linux/kthread.h> |
4b4e25f2 | 28 | #include <linux/freezer.h> |
163e783e | 29 | #include <linux/crc32c.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
784b4e29 | 31 | #include <linux/migrate.h> |
7e75bf3f | 32 | #include <asm/unaligned.h> |
4b4e25f2 | 33 | #include "compat.h" |
eb60ceac CM |
34 | #include "ctree.h" |
35 | #include "disk-io.h" | |
e089f05c | 36 | #include "transaction.h" |
0f7d52f4 | 37 | #include "btrfs_inode.h" |
0b86a832 | 38 | #include "volumes.h" |
db94535d | 39 | #include "print-tree.h" |
8b712842 | 40 | #include "async-thread.h" |
925baedd | 41 | #include "locking.h" |
e02119d5 | 42 | #include "tree-log.h" |
fa9c0d79 | 43 | #include "free-space-cache.h" |
eb60ceac | 44 | |
d1310b2e | 45 | static struct extent_io_ops btree_extent_io_ops; |
8b712842 | 46 | static void end_workqueue_fn(struct btrfs_work *work); |
4df27c4d | 47 | static void free_fs_root(struct btrfs_root *root); |
acce952b | 48 | static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info, |
49 | int read_only); | |
50 | static int btrfs_destroy_ordered_operations(struct btrfs_root *root); | |
51 | static int btrfs_destroy_ordered_extents(struct btrfs_root *root); | |
52 | static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, | |
53 | struct btrfs_root *root); | |
54 | static int btrfs_destroy_pending_snapshots(struct btrfs_transaction *t); | |
55 | static int btrfs_destroy_delalloc_inodes(struct btrfs_root *root); | |
56 | static int btrfs_destroy_marked_extents(struct btrfs_root *root, | |
57 | struct extent_io_tree *dirty_pages, | |
58 | int mark); | |
59 | static int btrfs_destroy_pinned_extent(struct btrfs_root *root, | |
60 | struct extent_io_tree *pinned_extents); | |
61 | static int btrfs_cleanup_transaction(struct btrfs_root *root); | |
ce9adaa5 | 62 | |
d352ac68 CM |
63 | /* |
64 | * end_io_wq structs are used to do processing in task context when an IO is | |
65 | * complete. This is used during reads to verify checksums, and it is used | |
66 | * by writes to insert metadata for new file extents after IO is complete. | |
67 | */ | |
ce9adaa5 CM |
68 | struct end_io_wq { |
69 | struct bio *bio; | |
70 | bio_end_io_t *end_io; | |
71 | void *private; | |
72 | struct btrfs_fs_info *info; | |
73 | int error; | |
22c59948 | 74 | int metadata; |
ce9adaa5 | 75 | struct list_head list; |
8b712842 | 76 | struct btrfs_work work; |
ce9adaa5 | 77 | }; |
0da5468f | 78 | |
d352ac68 CM |
79 | /* |
80 | * async submit bios are used to offload expensive checksumming | |
81 | * onto the worker threads. They checksum file and metadata bios | |
82 | * just before they are sent down the IO stack. | |
83 | */ | |
44b8bd7e CM |
84 | struct async_submit_bio { |
85 | struct inode *inode; | |
86 | struct bio *bio; | |
87 | struct list_head list; | |
4a69a410 CM |
88 | extent_submit_bio_hook_t *submit_bio_start; |
89 | extent_submit_bio_hook_t *submit_bio_done; | |
44b8bd7e CM |
90 | int rw; |
91 | int mirror_num; | |
c8b97818 | 92 | unsigned long bio_flags; |
eaf25d93 CM |
93 | /* |
94 | * bio_offset is optional, can be used if the pages in the bio | |
95 | * can't tell us where in the file the bio should go | |
96 | */ | |
97 | u64 bio_offset; | |
8b712842 | 98 | struct btrfs_work work; |
44b8bd7e CM |
99 | }; |
100 | ||
4008c04a CM |
101 | /* These are used to set the lockdep class on the extent buffer locks. |
102 | * The class is set by the readpage_end_io_hook after the buffer has | |
103 | * passed csum validation but before the pages are unlocked. | |
104 | * | |
105 | * The lockdep class is also set by btrfs_init_new_buffer on freshly | |
106 | * allocated blocks. | |
107 | * | |
108 | * The class is based on the level in the tree block, which allows lockdep | |
109 | * to know that lower nodes nest inside the locks of higher nodes. | |
110 | * | |
111 | * We also add a check to make sure the highest level of the tree is | |
112 | * the same as our lockdep setup here. If BTRFS_MAX_LEVEL changes, this | |
113 | * code needs update as well. | |
114 | */ | |
115 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
116 | # if BTRFS_MAX_LEVEL != 8 | |
117 | # error | |
118 | # endif | |
119 | static struct lock_class_key btrfs_eb_class[BTRFS_MAX_LEVEL + 1]; | |
120 | static const char *btrfs_eb_name[BTRFS_MAX_LEVEL + 1] = { | |
121 | /* leaf */ | |
122 | "btrfs-extent-00", | |
123 | "btrfs-extent-01", | |
124 | "btrfs-extent-02", | |
125 | "btrfs-extent-03", | |
126 | "btrfs-extent-04", | |
127 | "btrfs-extent-05", | |
128 | "btrfs-extent-06", | |
129 | "btrfs-extent-07", | |
130 | /* highest possible level */ | |
131 | "btrfs-extent-08", | |
132 | }; | |
133 | #endif | |
134 | ||
d352ac68 CM |
135 | /* |
136 | * extents on the btree inode are pretty simple, there's one extent | |
137 | * that covers the entire device | |
138 | */ | |
b2950863 CH |
139 | static struct extent_map *btree_get_extent(struct inode *inode, |
140 | struct page *page, size_t page_offset, u64 start, u64 len, | |
141 | int create) | |
7eccb903 | 142 | { |
5f39d397 CM |
143 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
144 | struct extent_map *em; | |
145 | int ret; | |
146 | ||
890871be | 147 | read_lock(&em_tree->lock); |
d1310b2e | 148 | em = lookup_extent_mapping(em_tree, start, len); |
a061fc8d CM |
149 | if (em) { |
150 | em->bdev = | |
151 | BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; | |
890871be | 152 | read_unlock(&em_tree->lock); |
5f39d397 | 153 | goto out; |
a061fc8d | 154 | } |
890871be | 155 | read_unlock(&em_tree->lock); |
7b13b7b1 | 156 | |
5f39d397 CM |
157 | em = alloc_extent_map(GFP_NOFS); |
158 | if (!em) { | |
159 | em = ERR_PTR(-ENOMEM); | |
160 | goto out; | |
161 | } | |
162 | em->start = 0; | |
0afbaf8c | 163 | em->len = (u64)-1; |
c8b97818 | 164 | em->block_len = (u64)-1; |
5f39d397 | 165 | em->block_start = 0; |
a061fc8d | 166 | em->bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; |
d1310b2e | 167 | |
890871be | 168 | write_lock(&em_tree->lock); |
5f39d397 CM |
169 | ret = add_extent_mapping(em_tree, em); |
170 | if (ret == -EEXIST) { | |
0afbaf8c CM |
171 | u64 failed_start = em->start; |
172 | u64 failed_len = em->len; | |
173 | ||
5f39d397 | 174 | free_extent_map(em); |
7b13b7b1 | 175 | em = lookup_extent_mapping(em_tree, start, len); |
0afbaf8c | 176 | if (em) { |
7b13b7b1 | 177 | ret = 0; |
0afbaf8c CM |
178 | } else { |
179 | em = lookup_extent_mapping(em_tree, failed_start, | |
180 | failed_len); | |
7b13b7b1 | 181 | ret = -EIO; |
0afbaf8c | 182 | } |
5f39d397 | 183 | } else if (ret) { |
7b13b7b1 CM |
184 | free_extent_map(em); |
185 | em = NULL; | |
5f39d397 | 186 | } |
890871be | 187 | write_unlock(&em_tree->lock); |
7b13b7b1 CM |
188 | |
189 | if (ret) | |
190 | em = ERR_PTR(ret); | |
5f39d397 CM |
191 | out: |
192 | return em; | |
7eccb903 CM |
193 | } |
194 | ||
19c00ddc CM |
195 | u32 btrfs_csum_data(struct btrfs_root *root, char *data, u32 seed, size_t len) |
196 | { | |
163e783e | 197 | return crc32c(seed, data, len); |
19c00ddc CM |
198 | } |
199 | ||
200 | void btrfs_csum_final(u32 crc, char *result) | |
201 | { | |
7e75bf3f | 202 | put_unaligned_le32(~crc, result); |
19c00ddc CM |
203 | } |
204 | ||
d352ac68 CM |
205 | /* |
206 | * compute the csum for a btree block, and either verify it or write it | |
207 | * into the csum field of the block. | |
208 | */ | |
19c00ddc CM |
209 | static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf, |
210 | int verify) | |
211 | { | |
607d432d JB |
212 | u16 csum_size = |
213 | btrfs_super_csum_size(&root->fs_info->super_copy); | |
214 | char *result = NULL; | |
19c00ddc CM |
215 | unsigned long len; |
216 | unsigned long cur_len; | |
217 | unsigned long offset = BTRFS_CSUM_SIZE; | |
218 | char *map_token = NULL; | |
219 | char *kaddr; | |
220 | unsigned long map_start; | |
221 | unsigned long map_len; | |
222 | int err; | |
223 | u32 crc = ~(u32)0; | |
607d432d | 224 | unsigned long inline_result; |
19c00ddc CM |
225 | |
226 | len = buf->len - offset; | |
d397712b | 227 | while (len > 0) { |
19c00ddc CM |
228 | err = map_private_extent_buffer(buf, offset, 32, |
229 | &map_token, &kaddr, | |
230 | &map_start, &map_len, KM_USER0); | |
d397712b | 231 | if (err) |
19c00ddc | 232 | return 1; |
19c00ddc CM |
233 | cur_len = min(len, map_len - (offset - map_start)); |
234 | crc = btrfs_csum_data(root, kaddr + offset - map_start, | |
235 | crc, cur_len); | |
236 | len -= cur_len; | |
237 | offset += cur_len; | |
238 | unmap_extent_buffer(buf, map_token, KM_USER0); | |
239 | } | |
607d432d JB |
240 | if (csum_size > sizeof(inline_result)) { |
241 | result = kzalloc(csum_size * sizeof(char), GFP_NOFS); | |
242 | if (!result) | |
243 | return 1; | |
244 | } else { | |
245 | result = (char *)&inline_result; | |
246 | } | |
247 | ||
19c00ddc CM |
248 | btrfs_csum_final(crc, result); |
249 | ||
250 | if (verify) { | |
607d432d | 251 | if (memcmp_extent_buffer(buf, result, 0, csum_size)) { |
e4204ded CM |
252 | u32 val; |
253 | u32 found = 0; | |
607d432d | 254 | memcpy(&found, result, csum_size); |
e4204ded | 255 | |
607d432d | 256 | read_extent_buffer(buf, &val, 0, csum_size); |
193f284d CM |
257 | if (printk_ratelimit()) { |
258 | printk(KERN_INFO "btrfs: %s checksum verify " | |
259 | "failed on %llu wanted %X found %X " | |
260 | "level %d\n", | |
261 | root->fs_info->sb->s_id, | |
262 | (unsigned long long)buf->start, val, found, | |
263 | btrfs_header_level(buf)); | |
264 | } | |
607d432d JB |
265 | if (result != (char *)&inline_result) |
266 | kfree(result); | |
19c00ddc CM |
267 | return 1; |
268 | } | |
269 | } else { | |
607d432d | 270 | write_extent_buffer(buf, result, 0, csum_size); |
19c00ddc | 271 | } |
607d432d JB |
272 | if (result != (char *)&inline_result) |
273 | kfree(result); | |
19c00ddc CM |
274 | return 0; |
275 | } | |
276 | ||
d352ac68 CM |
277 | /* |
278 | * we can't consider a given block up to date unless the transid of the | |
279 | * block matches the transid in the parent node's pointer. This is how we | |
280 | * detect blocks that either didn't get written at all or got written | |
281 | * in the wrong place. | |
282 | */ | |
1259ab75 CM |
283 | static int verify_parent_transid(struct extent_io_tree *io_tree, |
284 | struct extent_buffer *eb, u64 parent_transid) | |
285 | { | |
2ac55d41 | 286 | struct extent_state *cached_state = NULL; |
1259ab75 CM |
287 | int ret; |
288 | ||
289 | if (!parent_transid || btrfs_header_generation(eb) == parent_transid) | |
290 | return 0; | |
291 | ||
2ac55d41 JB |
292 | lock_extent_bits(io_tree, eb->start, eb->start + eb->len - 1, |
293 | 0, &cached_state, GFP_NOFS); | |
294 | if (extent_buffer_uptodate(io_tree, eb, cached_state) && | |
1259ab75 CM |
295 | btrfs_header_generation(eb) == parent_transid) { |
296 | ret = 0; | |
297 | goto out; | |
298 | } | |
193f284d CM |
299 | if (printk_ratelimit()) { |
300 | printk("parent transid verify failed on %llu wanted %llu " | |
301 | "found %llu\n", | |
302 | (unsigned long long)eb->start, | |
303 | (unsigned long long)parent_transid, | |
304 | (unsigned long long)btrfs_header_generation(eb)); | |
305 | } | |
1259ab75 | 306 | ret = 1; |
2ac55d41 | 307 | clear_extent_buffer_uptodate(io_tree, eb, &cached_state); |
33958dc6 | 308 | out: |
2ac55d41 JB |
309 | unlock_extent_cached(io_tree, eb->start, eb->start + eb->len - 1, |
310 | &cached_state, GFP_NOFS); | |
1259ab75 | 311 | return ret; |
1259ab75 CM |
312 | } |
313 | ||
d352ac68 CM |
314 | /* |
315 | * helper to read a given tree block, doing retries as required when | |
316 | * the checksums don't match and we have alternate mirrors to try. | |
317 | */ | |
f188591e CM |
318 | static int btree_read_extent_buffer_pages(struct btrfs_root *root, |
319 | struct extent_buffer *eb, | |
ca7a79ad | 320 | u64 start, u64 parent_transid) |
f188591e CM |
321 | { |
322 | struct extent_io_tree *io_tree; | |
323 | int ret; | |
324 | int num_copies = 0; | |
325 | int mirror_num = 0; | |
326 | ||
a826d6dc | 327 | clear_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); |
f188591e CM |
328 | io_tree = &BTRFS_I(root->fs_info->btree_inode)->io_tree; |
329 | while (1) { | |
330 | ret = read_extent_buffer_pages(io_tree, eb, start, 1, | |
331 | btree_get_extent, mirror_num); | |
1259ab75 CM |
332 | if (!ret && |
333 | !verify_parent_transid(io_tree, eb, parent_transid)) | |
f188591e | 334 | return ret; |
d397712b | 335 | |
a826d6dc JB |
336 | /* |
337 | * This buffer's crc is fine, but its contents are corrupted, so | |
338 | * there is no reason to read the other copies, they won't be | |
339 | * any less wrong. | |
340 | */ | |
341 | if (test_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags)) | |
342 | return ret; | |
343 | ||
f188591e CM |
344 | num_copies = btrfs_num_copies(&root->fs_info->mapping_tree, |
345 | eb->start, eb->len); | |
4235298e | 346 | if (num_copies == 1) |
f188591e | 347 | return ret; |
4235298e | 348 | |
f188591e | 349 | mirror_num++; |
4235298e | 350 | if (mirror_num > num_copies) |
f188591e | 351 | return ret; |
f188591e | 352 | } |
f188591e CM |
353 | return -EIO; |
354 | } | |
19c00ddc | 355 | |
d352ac68 | 356 | /* |
d397712b CM |
357 | * checksum a dirty tree block before IO. This has extra checks to make sure |
358 | * we only fill in the checksum field in the first page of a multi-page block | |
d352ac68 | 359 | */ |
d397712b | 360 | |
b2950863 | 361 | static int csum_dirty_buffer(struct btrfs_root *root, struct page *page) |
19c00ddc | 362 | { |
d1310b2e | 363 | struct extent_io_tree *tree; |
35ebb934 | 364 | u64 start = (u64)page->index << PAGE_CACHE_SHIFT; |
19c00ddc | 365 | u64 found_start; |
19c00ddc CM |
366 | unsigned long len; |
367 | struct extent_buffer *eb; | |
f188591e CM |
368 | int ret; |
369 | ||
d1310b2e | 370 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
19c00ddc | 371 | |
eb14ab8e CM |
372 | if (page->private == EXTENT_PAGE_PRIVATE) { |
373 | WARN_ON(1); | |
19c00ddc | 374 | goto out; |
eb14ab8e CM |
375 | } |
376 | if (!page->private) { | |
377 | WARN_ON(1); | |
19c00ddc | 378 | goto out; |
eb14ab8e | 379 | } |
19c00ddc | 380 | len = page->private >> 2; |
d397712b CM |
381 | WARN_ON(len == 0); |
382 | ||
19c00ddc | 383 | eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); |
91ca338d TI |
384 | if (eb == NULL) { |
385 | WARN_ON(1); | |
386 | goto out; | |
387 | } | |
ca7a79ad CM |
388 | ret = btree_read_extent_buffer_pages(root, eb, start + PAGE_CACHE_SIZE, |
389 | btrfs_header_generation(eb)); | |
f188591e | 390 | BUG_ON(ret); |
784b4e29 CM |
391 | WARN_ON(!btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN)); |
392 | ||
19c00ddc CM |
393 | found_start = btrfs_header_bytenr(eb); |
394 | if (found_start != start) { | |
55c69072 CM |
395 | WARN_ON(1); |
396 | goto err; | |
397 | } | |
398 | if (eb->first_page != page) { | |
55c69072 CM |
399 | WARN_ON(1); |
400 | goto err; | |
401 | } | |
402 | if (!PageUptodate(page)) { | |
55c69072 CM |
403 | WARN_ON(1); |
404 | goto err; | |
19c00ddc | 405 | } |
19c00ddc | 406 | csum_tree_block(root, eb, 0); |
55c69072 | 407 | err: |
19c00ddc CM |
408 | free_extent_buffer(eb); |
409 | out: | |
410 | return 0; | |
411 | } | |
412 | ||
2b82032c YZ |
413 | static int check_tree_block_fsid(struct btrfs_root *root, |
414 | struct extent_buffer *eb) | |
415 | { | |
416 | struct btrfs_fs_devices *fs_devices = root->fs_info->fs_devices; | |
417 | u8 fsid[BTRFS_UUID_SIZE]; | |
418 | int ret = 1; | |
419 | ||
420 | read_extent_buffer(eb, fsid, (unsigned long)btrfs_header_fsid(eb), | |
421 | BTRFS_FSID_SIZE); | |
422 | while (fs_devices) { | |
423 | if (!memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE)) { | |
424 | ret = 0; | |
425 | break; | |
426 | } | |
427 | fs_devices = fs_devices->seed; | |
428 | } | |
429 | return ret; | |
430 | } | |
431 | ||
a826d6dc JB |
432 | #define CORRUPT(reason, eb, root, slot) \ |
433 | printk(KERN_CRIT "btrfs: corrupt leaf, %s: block=%llu," \ | |
434 | "root=%llu, slot=%d\n", reason, \ | |
435 | (unsigned long long)btrfs_header_bytenr(eb), \ | |
436 | (unsigned long long)root->objectid, slot) | |
437 | ||
438 | static noinline int check_leaf(struct btrfs_root *root, | |
439 | struct extent_buffer *leaf) | |
440 | { | |
441 | struct btrfs_key key; | |
442 | struct btrfs_key leaf_key; | |
443 | u32 nritems = btrfs_header_nritems(leaf); | |
444 | int slot; | |
445 | ||
446 | if (nritems == 0) | |
447 | return 0; | |
448 | ||
449 | /* Check the 0 item */ | |
450 | if (btrfs_item_offset_nr(leaf, 0) + btrfs_item_size_nr(leaf, 0) != | |
451 | BTRFS_LEAF_DATA_SIZE(root)) { | |
452 | CORRUPT("invalid item offset size pair", leaf, root, 0); | |
453 | return -EIO; | |
454 | } | |
455 | ||
456 | /* | |
457 | * Check to make sure each items keys are in the correct order and their | |
458 | * offsets make sense. We only have to loop through nritems-1 because | |
459 | * we check the current slot against the next slot, which verifies the | |
460 | * next slot's offset+size makes sense and that the current's slot | |
461 | * offset is correct. | |
462 | */ | |
463 | for (slot = 0; slot < nritems - 1; slot++) { | |
464 | btrfs_item_key_to_cpu(leaf, &leaf_key, slot); | |
465 | btrfs_item_key_to_cpu(leaf, &key, slot + 1); | |
466 | ||
467 | /* Make sure the keys are in the right order */ | |
468 | if (btrfs_comp_cpu_keys(&leaf_key, &key) >= 0) { | |
469 | CORRUPT("bad key order", leaf, root, slot); | |
470 | return -EIO; | |
471 | } | |
472 | ||
473 | /* | |
474 | * Make sure the offset and ends are right, remember that the | |
475 | * item data starts at the end of the leaf and grows towards the | |
476 | * front. | |
477 | */ | |
478 | if (btrfs_item_offset_nr(leaf, slot) != | |
479 | btrfs_item_end_nr(leaf, slot + 1)) { | |
480 | CORRUPT("slot offset bad", leaf, root, slot); | |
481 | return -EIO; | |
482 | } | |
483 | ||
484 | /* | |
485 | * Check to make sure that we don't point outside of the leaf, | |
486 | * just incase all the items are consistent to eachother, but | |
487 | * all point outside of the leaf. | |
488 | */ | |
489 | if (btrfs_item_end_nr(leaf, slot) > | |
490 | BTRFS_LEAF_DATA_SIZE(root)) { | |
491 | CORRUPT("slot end outside of leaf", leaf, root, slot); | |
492 | return -EIO; | |
493 | } | |
494 | } | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
4008c04a CM |
499 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
500 | void btrfs_set_buffer_lockdep_class(struct extent_buffer *eb, int level) | |
501 | { | |
502 | lockdep_set_class_and_name(&eb->lock, | |
503 | &btrfs_eb_class[level], | |
504 | btrfs_eb_name[level]); | |
505 | } | |
506 | #endif | |
507 | ||
b2950863 | 508 | static int btree_readpage_end_io_hook(struct page *page, u64 start, u64 end, |
ce9adaa5 CM |
509 | struct extent_state *state) |
510 | { | |
511 | struct extent_io_tree *tree; | |
512 | u64 found_start; | |
513 | int found_level; | |
514 | unsigned long len; | |
515 | struct extent_buffer *eb; | |
516 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; | |
f188591e | 517 | int ret = 0; |
ce9adaa5 CM |
518 | |
519 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
520 | if (page->private == EXTENT_PAGE_PRIVATE) | |
521 | goto out; | |
522 | if (!page->private) | |
523 | goto out; | |
d397712b | 524 | |
ce9adaa5 | 525 | len = page->private >> 2; |
d397712b CM |
526 | WARN_ON(len == 0); |
527 | ||
ce9adaa5 | 528 | eb = alloc_extent_buffer(tree, start, len, page, GFP_NOFS); |
91ca338d TI |
529 | if (eb == NULL) { |
530 | ret = -EIO; | |
531 | goto out; | |
532 | } | |
f188591e | 533 | |
ce9adaa5 | 534 | found_start = btrfs_header_bytenr(eb); |
23a07867 | 535 | if (found_start != start) { |
193f284d CM |
536 | if (printk_ratelimit()) { |
537 | printk(KERN_INFO "btrfs bad tree block start " | |
538 | "%llu %llu\n", | |
539 | (unsigned long long)found_start, | |
540 | (unsigned long long)eb->start); | |
541 | } | |
f188591e | 542 | ret = -EIO; |
ce9adaa5 CM |
543 | goto err; |
544 | } | |
545 | if (eb->first_page != page) { | |
d397712b CM |
546 | printk(KERN_INFO "btrfs bad first page %lu %lu\n", |
547 | eb->first_page->index, page->index); | |
ce9adaa5 | 548 | WARN_ON(1); |
f188591e | 549 | ret = -EIO; |
ce9adaa5 CM |
550 | goto err; |
551 | } | |
2b82032c | 552 | if (check_tree_block_fsid(root, eb)) { |
193f284d CM |
553 | if (printk_ratelimit()) { |
554 | printk(KERN_INFO "btrfs bad fsid on block %llu\n", | |
555 | (unsigned long long)eb->start); | |
556 | } | |
1259ab75 CM |
557 | ret = -EIO; |
558 | goto err; | |
559 | } | |
ce9adaa5 CM |
560 | found_level = btrfs_header_level(eb); |
561 | ||
4008c04a CM |
562 | btrfs_set_buffer_lockdep_class(eb, found_level); |
563 | ||
ce9adaa5 | 564 | ret = csum_tree_block(root, eb, 1); |
a826d6dc | 565 | if (ret) { |
f188591e | 566 | ret = -EIO; |
a826d6dc JB |
567 | goto err; |
568 | } | |
569 | ||
570 | /* | |
571 | * If this is a leaf block and it is corrupt, set the corrupt bit so | |
572 | * that we don't try and read the other copies of this block, just | |
573 | * return -EIO. | |
574 | */ | |
575 | if (found_level == 0 && check_leaf(root, eb)) { | |
576 | set_bit(EXTENT_BUFFER_CORRUPT, &eb->bflags); | |
577 | ret = -EIO; | |
578 | } | |
ce9adaa5 CM |
579 | |
580 | end = min_t(u64, eb->len, PAGE_CACHE_SIZE); | |
581 | end = eb->start + end - 1; | |
ce9adaa5 CM |
582 | err: |
583 | free_extent_buffer(eb); | |
584 | out: | |
f188591e | 585 | return ret; |
ce9adaa5 CM |
586 | } |
587 | ||
ce9adaa5 | 588 | static void end_workqueue_bio(struct bio *bio, int err) |
ce9adaa5 CM |
589 | { |
590 | struct end_io_wq *end_io_wq = bio->bi_private; | |
591 | struct btrfs_fs_info *fs_info; | |
ce9adaa5 | 592 | |
ce9adaa5 | 593 | fs_info = end_io_wq->info; |
ce9adaa5 | 594 | end_io_wq->error = err; |
8b712842 CM |
595 | end_io_wq->work.func = end_workqueue_fn; |
596 | end_io_wq->work.flags = 0; | |
d20f7043 | 597 | |
7b6d91da | 598 | if (bio->bi_rw & REQ_WRITE) { |
0cb59c99 | 599 | if (end_io_wq->metadata == 1) |
cad321ad CM |
600 | btrfs_queue_worker(&fs_info->endio_meta_write_workers, |
601 | &end_io_wq->work); | |
0cb59c99 JB |
602 | else if (end_io_wq->metadata == 2) |
603 | btrfs_queue_worker(&fs_info->endio_freespace_worker, | |
604 | &end_io_wq->work); | |
cad321ad CM |
605 | else |
606 | btrfs_queue_worker(&fs_info->endio_write_workers, | |
607 | &end_io_wq->work); | |
d20f7043 CM |
608 | } else { |
609 | if (end_io_wq->metadata) | |
610 | btrfs_queue_worker(&fs_info->endio_meta_workers, | |
611 | &end_io_wq->work); | |
612 | else | |
613 | btrfs_queue_worker(&fs_info->endio_workers, | |
614 | &end_io_wq->work); | |
615 | } | |
ce9adaa5 CM |
616 | } |
617 | ||
0cb59c99 JB |
618 | /* |
619 | * For the metadata arg you want | |
620 | * | |
621 | * 0 - if data | |
622 | * 1 - if normal metadta | |
623 | * 2 - if writing to the free space cache area | |
624 | */ | |
22c59948 CM |
625 | int btrfs_bio_wq_end_io(struct btrfs_fs_info *info, struct bio *bio, |
626 | int metadata) | |
0b86a832 | 627 | { |
ce9adaa5 | 628 | struct end_io_wq *end_io_wq; |
ce9adaa5 CM |
629 | end_io_wq = kmalloc(sizeof(*end_io_wq), GFP_NOFS); |
630 | if (!end_io_wq) | |
631 | return -ENOMEM; | |
632 | ||
633 | end_io_wq->private = bio->bi_private; | |
634 | end_io_wq->end_io = bio->bi_end_io; | |
22c59948 | 635 | end_io_wq->info = info; |
ce9adaa5 CM |
636 | end_io_wq->error = 0; |
637 | end_io_wq->bio = bio; | |
22c59948 | 638 | end_io_wq->metadata = metadata; |
ce9adaa5 CM |
639 | |
640 | bio->bi_private = end_io_wq; | |
641 | bio->bi_end_io = end_workqueue_bio; | |
22c59948 CM |
642 | return 0; |
643 | } | |
644 | ||
b64a2851 | 645 | unsigned long btrfs_async_submit_limit(struct btrfs_fs_info *info) |
0986fe9e | 646 | { |
4854ddd0 CM |
647 | unsigned long limit = min_t(unsigned long, |
648 | info->workers.max_workers, | |
649 | info->fs_devices->open_devices); | |
650 | return 256 * limit; | |
651 | } | |
0986fe9e | 652 | |
4854ddd0 CM |
653 | int btrfs_congested_async(struct btrfs_fs_info *info, int iodone) |
654 | { | |
b64a2851 CM |
655 | return atomic_read(&info->nr_async_bios) > |
656 | btrfs_async_submit_limit(info); | |
0986fe9e CM |
657 | } |
658 | ||
4a69a410 CM |
659 | static void run_one_async_start(struct btrfs_work *work) |
660 | { | |
4a69a410 CM |
661 | struct async_submit_bio *async; |
662 | ||
663 | async = container_of(work, struct async_submit_bio, work); | |
4a69a410 | 664 | async->submit_bio_start(async->inode, async->rw, async->bio, |
eaf25d93 CM |
665 | async->mirror_num, async->bio_flags, |
666 | async->bio_offset); | |
4a69a410 CM |
667 | } |
668 | ||
669 | static void run_one_async_done(struct btrfs_work *work) | |
8b712842 CM |
670 | { |
671 | struct btrfs_fs_info *fs_info; | |
672 | struct async_submit_bio *async; | |
4854ddd0 | 673 | int limit; |
8b712842 CM |
674 | |
675 | async = container_of(work, struct async_submit_bio, work); | |
676 | fs_info = BTRFS_I(async->inode)->root->fs_info; | |
4854ddd0 | 677 | |
b64a2851 | 678 | limit = btrfs_async_submit_limit(fs_info); |
4854ddd0 CM |
679 | limit = limit * 2 / 3; |
680 | ||
8b712842 | 681 | atomic_dec(&fs_info->nr_async_submits); |
0986fe9e | 682 | |
b64a2851 CM |
683 | if (atomic_read(&fs_info->nr_async_submits) < limit && |
684 | waitqueue_active(&fs_info->async_submit_wait)) | |
4854ddd0 CM |
685 | wake_up(&fs_info->async_submit_wait); |
686 | ||
4a69a410 | 687 | async->submit_bio_done(async->inode, async->rw, async->bio, |
eaf25d93 CM |
688 | async->mirror_num, async->bio_flags, |
689 | async->bio_offset); | |
4a69a410 CM |
690 | } |
691 | ||
692 | static void run_one_async_free(struct btrfs_work *work) | |
693 | { | |
694 | struct async_submit_bio *async; | |
695 | ||
696 | async = container_of(work, struct async_submit_bio, work); | |
8b712842 CM |
697 | kfree(async); |
698 | } | |
699 | ||
44b8bd7e CM |
700 | int btrfs_wq_submit_bio(struct btrfs_fs_info *fs_info, struct inode *inode, |
701 | int rw, struct bio *bio, int mirror_num, | |
c8b97818 | 702 | unsigned long bio_flags, |
eaf25d93 | 703 | u64 bio_offset, |
4a69a410 CM |
704 | extent_submit_bio_hook_t *submit_bio_start, |
705 | extent_submit_bio_hook_t *submit_bio_done) | |
44b8bd7e CM |
706 | { |
707 | struct async_submit_bio *async; | |
708 | ||
709 | async = kmalloc(sizeof(*async), GFP_NOFS); | |
710 | if (!async) | |
711 | return -ENOMEM; | |
712 | ||
713 | async->inode = inode; | |
714 | async->rw = rw; | |
715 | async->bio = bio; | |
716 | async->mirror_num = mirror_num; | |
4a69a410 CM |
717 | async->submit_bio_start = submit_bio_start; |
718 | async->submit_bio_done = submit_bio_done; | |
719 | ||
720 | async->work.func = run_one_async_start; | |
721 | async->work.ordered_func = run_one_async_done; | |
722 | async->work.ordered_free = run_one_async_free; | |
723 | ||
8b712842 | 724 | async->work.flags = 0; |
c8b97818 | 725 | async->bio_flags = bio_flags; |
eaf25d93 | 726 | async->bio_offset = bio_offset; |
8c8bee1d | 727 | |
cb03c743 | 728 | atomic_inc(&fs_info->nr_async_submits); |
d313d7a3 | 729 | |
7b6d91da | 730 | if (rw & REQ_SYNC) |
d313d7a3 CM |
731 | btrfs_set_work_high_prio(&async->work); |
732 | ||
8b712842 | 733 | btrfs_queue_worker(&fs_info->workers, &async->work); |
9473f16c | 734 | |
d397712b | 735 | while (atomic_read(&fs_info->async_submit_draining) && |
771ed689 CM |
736 | atomic_read(&fs_info->nr_async_submits)) { |
737 | wait_event(fs_info->async_submit_wait, | |
738 | (atomic_read(&fs_info->nr_async_submits) == 0)); | |
739 | } | |
740 | ||
44b8bd7e CM |
741 | return 0; |
742 | } | |
743 | ||
ce3ed71a CM |
744 | static int btree_csum_one_bio(struct bio *bio) |
745 | { | |
746 | struct bio_vec *bvec = bio->bi_io_vec; | |
747 | int bio_index = 0; | |
748 | struct btrfs_root *root; | |
749 | ||
750 | WARN_ON(bio->bi_vcnt <= 0); | |
d397712b | 751 | while (bio_index < bio->bi_vcnt) { |
ce3ed71a CM |
752 | root = BTRFS_I(bvec->bv_page->mapping->host)->root; |
753 | csum_dirty_buffer(root, bvec->bv_page); | |
754 | bio_index++; | |
755 | bvec++; | |
756 | } | |
757 | return 0; | |
758 | } | |
759 | ||
4a69a410 CM |
760 | static int __btree_submit_bio_start(struct inode *inode, int rw, |
761 | struct bio *bio, int mirror_num, | |
eaf25d93 CM |
762 | unsigned long bio_flags, |
763 | u64 bio_offset) | |
22c59948 | 764 | { |
8b712842 CM |
765 | /* |
766 | * when we're called for a write, we're already in the async | |
5443be45 | 767 | * submission context. Just jump into btrfs_map_bio |
8b712842 | 768 | */ |
4a69a410 CM |
769 | btree_csum_one_bio(bio); |
770 | return 0; | |
771 | } | |
22c59948 | 772 | |
4a69a410 | 773 | static int __btree_submit_bio_done(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
774 | int mirror_num, unsigned long bio_flags, |
775 | u64 bio_offset) | |
4a69a410 | 776 | { |
8b712842 | 777 | /* |
4a69a410 CM |
778 | * when we're called for a write, we're already in the async |
779 | * submission context. Just jump into btrfs_map_bio | |
8b712842 | 780 | */ |
8b712842 | 781 | return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, mirror_num, 1); |
0b86a832 CM |
782 | } |
783 | ||
44b8bd7e | 784 | static int btree_submit_bio_hook(struct inode *inode, int rw, struct bio *bio, |
eaf25d93 CM |
785 | int mirror_num, unsigned long bio_flags, |
786 | u64 bio_offset) | |
44b8bd7e | 787 | { |
cad321ad CM |
788 | int ret; |
789 | ||
790 | ret = btrfs_bio_wq_end_io(BTRFS_I(inode)->root->fs_info, | |
791 | bio, 1); | |
792 | BUG_ON(ret); | |
793 | ||
7b6d91da | 794 | if (!(rw & REQ_WRITE)) { |
4a69a410 CM |
795 | /* |
796 | * called for a read, do the setup so that checksum validation | |
797 | * can happen in the async kernel threads | |
798 | */ | |
4a69a410 | 799 | return btrfs_map_bio(BTRFS_I(inode)->root, rw, bio, |
6f3577bd | 800 | mirror_num, 0); |
44b8bd7e | 801 | } |
d313d7a3 | 802 | |
cad321ad CM |
803 | /* |
804 | * kthread helpers are used to submit writes so that checksumming | |
805 | * can happen in parallel across all CPUs | |
806 | */ | |
44b8bd7e | 807 | return btrfs_wq_submit_bio(BTRFS_I(inode)->root->fs_info, |
c8b97818 | 808 | inode, rw, bio, mirror_num, 0, |
eaf25d93 | 809 | bio_offset, |
4a69a410 CM |
810 | __btree_submit_bio_start, |
811 | __btree_submit_bio_done); | |
44b8bd7e CM |
812 | } |
813 | ||
3dd1462e | 814 | #ifdef CONFIG_MIGRATION |
784b4e29 CM |
815 | static int btree_migratepage(struct address_space *mapping, |
816 | struct page *newpage, struct page *page) | |
817 | { | |
818 | /* | |
819 | * we can't safely write a btree page from here, | |
820 | * we haven't done the locking hook | |
821 | */ | |
822 | if (PageDirty(page)) | |
823 | return -EAGAIN; | |
824 | /* | |
825 | * Buffers may be managed in a filesystem specific way. | |
826 | * We must have no buffers or drop them. | |
827 | */ | |
828 | if (page_has_private(page) && | |
829 | !try_to_release_page(page, GFP_KERNEL)) | |
830 | return -EAGAIN; | |
784b4e29 CM |
831 | return migrate_page(mapping, newpage, page); |
832 | } | |
3dd1462e | 833 | #endif |
784b4e29 | 834 | |
0da5468f CM |
835 | static int btree_writepage(struct page *page, struct writeback_control *wbc) |
836 | { | |
d1310b2e | 837 | struct extent_io_tree *tree; |
b9473439 CM |
838 | struct btrfs_root *root = BTRFS_I(page->mapping->host)->root; |
839 | struct extent_buffer *eb; | |
840 | int was_dirty; | |
841 | ||
d1310b2e | 842 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
b9473439 CM |
843 | if (!(current->flags & PF_MEMALLOC)) { |
844 | return extent_write_full_page(tree, page, | |
845 | btree_get_extent, wbc); | |
846 | } | |
5443be45 | 847 | |
b9473439 | 848 | redirty_page_for_writepage(wbc, page); |
784b4e29 | 849 | eb = btrfs_find_tree_block(root, page_offset(page), PAGE_CACHE_SIZE); |
b9473439 CM |
850 | WARN_ON(!eb); |
851 | ||
852 | was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); | |
853 | if (!was_dirty) { | |
854 | spin_lock(&root->fs_info->delalloc_lock); | |
855 | root->fs_info->dirty_metadata_bytes += PAGE_CACHE_SIZE; | |
856 | spin_unlock(&root->fs_info->delalloc_lock); | |
5443be45 | 857 | } |
b9473439 CM |
858 | free_extent_buffer(eb); |
859 | ||
860 | unlock_page(page); | |
861 | return 0; | |
5f39d397 | 862 | } |
0da5468f CM |
863 | |
864 | static int btree_writepages(struct address_space *mapping, | |
865 | struct writeback_control *wbc) | |
866 | { | |
d1310b2e CM |
867 | struct extent_io_tree *tree; |
868 | tree = &BTRFS_I(mapping->host)->io_tree; | |
d8d5f3e1 | 869 | if (wbc->sync_mode == WB_SYNC_NONE) { |
b9473439 | 870 | struct btrfs_root *root = BTRFS_I(mapping->host)->root; |
793955bc | 871 | u64 num_dirty; |
24ab9cd8 | 872 | unsigned long thresh = 32 * 1024 * 1024; |
448d640b CM |
873 | |
874 | if (wbc->for_kupdate) | |
875 | return 0; | |
876 | ||
b9473439 CM |
877 | /* this is a bit racy, but that's ok */ |
878 | num_dirty = root->fs_info->dirty_metadata_bytes; | |
d397712b | 879 | if (num_dirty < thresh) |
793955bc | 880 | return 0; |
793955bc | 881 | } |
0da5468f CM |
882 | return extent_writepages(tree, mapping, btree_get_extent, wbc); |
883 | } | |
884 | ||
b2950863 | 885 | static int btree_readpage(struct file *file, struct page *page) |
5f39d397 | 886 | { |
d1310b2e CM |
887 | struct extent_io_tree *tree; |
888 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
5f39d397 CM |
889 | return extent_read_full_page(tree, page, btree_get_extent); |
890 | } | |
22b0ebda | 891 | |
70dec807 | 892 | static int btree_releasepage(struct page *page, gfp_t gfp_flags) |
5f39d397 | 893 | { |
d1310b2e CM |
894 | struct extent_io_tree *tree; |
895 | struct extent_map_tree *map; | |
5f39d397 | 896 | int ret; |
d98237b3 | 897 | |
98509cfc | 898 | if (PageWriteback(page) || PageDirty(page)) |
d397712b | 899 | return 0; |
98509cfc | 900 | |
d1310b2e CM |
901 | tree = &BTRFS_I(page->mapping->host)->io_tree; |
902 | map = &BTRFS_I(page->mapping->host)->extent_tree; | |
6af118ce | 903 | |
7b13b7b1 | 904 | ret = try_release_extent_state(map, tree, page, gfp_flags); |
d397712b | 905 | if (!ret) |
6af118ce | 906 | return 0; |
6af118ce CM |
907 | |
908 | ret = try_release_extent_buffer(tree, page); | |
5f39d397 CM |
909 | if (ret == 1) { |
910 | ClearPagePrivate(page); | |
911 | set_page_private(page, 0); | |
912 | page_cache_release(page); | |
913 | } | |
6af118ce | 914 | |
d98237b3 CM |
915 | return ret; |
916 | } | |
917 | ||
5f39d397 | 918 | static void btree_invalidatepage(struct page *page, unsigned long offset) |
d98237b3 | 919 | { |
d1310b2e CM |
920 | struct extent_io_tree *tree; |
921 | tree = &BTRFS_I(page->mapping->host)->io_tree; | |
5f39d397 CM |
922 | extent_invalidatepage(tree, page, offset); |
923 | btree_releasepage(page, GFP_NOFS); | |
9ad6b7bc | 924 | if (PagePrivate(page)) { |
d397712b CM |
925 | printk(KERN_WARNING "btrfs warning page private not zero " |
926 | "on page %llu\n", (unsigned long long)page_offset(page)); | |
9ad6b7bc CM |
927 | ClearPagePrivate(page); |
928 | set_page_private(page, 0); | |
929 | page_cache_release(page); | |
930 | } | |
d98237b3 CM |
931 | } |
932 | ||
7f09410b | 933 | static const struct address_space_operations btree_aops = { |
d98237b3 CM |
934 | .readpage = btree_readpage, |
935 | .writepage = btree_writepage, | |
0da5468f | 936 | .writepages = btree_writepages, |
5f39d397 CM |
937 | .releasepage = btree_releasepage, |
938 | .invalidatepage = btree_invalidatepage, | |
d98237b3 | 939 | .sync_page = block_sync_page, |
5a92bc88 | 940 | #ifdef CONFIG_MIGRATION |
784b4e29 | 941 | .migratepage = btree_migratepage, |
5a92bc88 | 942 | #endif |
d98237b3 CM |
943 | }; |
944 | ||
ca7a79ad CM |
945 | int readahead_tree_block(struct btrfs_root *root, u64 bytenr, u32 blocksize, |
946 | u64 parent_transid) | |
090d1875 | 947 | { |
5f39d397 CM |
948 | struct extent_buffer *buf = NULL; |
949 | struct inode *btree_inode = root->fs_info->btree_inode; | |
de428b63 | 950 | int ret = 0; |
090d1875 | 951 | |
db94535d | 952 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
5f39d397 | 953 | if (!buf) |
090d1875 | 954 | return 0; |
d1310b2e | 955 | read_extent_buffer_pages(&BTRFS_I(btree_inode)->io_tree, |
f188591e | 956 | buf, 0, 0, btree_get_extent, 0); |
5f39d397 | 957 | free_extent_buffer(buf); |
de428b63 | 958 | return ret; |
090d1875 CM |
959 | } |
960 | ||
0999df54 CM |
961 | struct extent_buffer *btrfs_find_tree_block(struct btrfs_root *root, |
962 | u64 bytenr, u32 blocksize) | |
963 | { | |
964 | struct inode *btree_inode = root->fs_info->btree_inode; | |
965 | struct extent_buffer *eb; | |
966 | eb = find_extent_buffer(&BTRFS_I(btree_inode)->io_tree, | |
967 | bytenr, blocksize, GFP_NOFS); | |
968 | return eb; | |
969 | } | |
970 | ||
971 | struct extent_buffer *btrfs_find_create_tree_block(struct btrfs_root *root, | |
972 | u64 bytenr, u32 blocksize) | |
973 | { | |
974 | struct inode *btree_inode = root->fs_info->btree_inode; | |
975 | struct extent_buffer *eb; | |
976 | ||
977 | eb = alloc_extent_buffer(&BTRFS_I(btree_inode)->io_tree, | |
978 | bytenr, blocksize, NULL, GFP_NOFS); | |
979 | return eb; | |
980 | } | |
981 | ||
982 | ||
e02119d5 CM |
983 | int btrfs_write_tree_block(struct extent_buffer *buf) |
984 | { | |
8aa38c31 CH |
985 | return filemap_fdatawrite_range(buf->first_page->mapping, buf->start, |
986 | buf->start + buf->len - 1); | |
e02119d5 CM |
987 | } |
988 | ||
989 | int btrfs_wait_tree_block_writeback(struct extent_buffer *buf) | |
990 | { | |
8aa38c31 CH |
991 | return filemap_fdatawait_range(buf->first_page->mapping, |
992 | buf->start, buf->start + buf->len - 1); | |
e02119d5 CM |
993 | } |
994 | ||
0999df54 | 995 | struct extent_buffer *read_tree_block(struct btrfs_root *root, u64 bytenr, |
ca7a79ad | 996 | u32 blocksize, u64 parent_transid) |
0999df54 CM |
997 | { |
998 | struct extent_buffer *buf = NULL; | |
0999df54 CM |
999 | int ret; |
1000 | ||
0999df54 CM |
1001 | buf = btrfs_find_create_tree_block(root, bytenr, blocksize); |
1002 | if (!buf) | |
1003 | return NULL; | |
0999df54 | 1004 | |
ca7a79ad | 1005 | ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); |
ce9adaa5 | 1006 | |
d397712b | 1007 | if (ret == 0) |
b4ce94de | 1008 | set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); |
5f39d397 | 1009 | return buf; |
ce9adaa5 | 1010 | |
eb60ceac CM |
1011 | } |
1012 | ||
e089f05c | 1013 | int clean_tree_block(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
5f39d397 | 1014 | struct extent_buffer *buf) |
ed2ff2cb | 1015 | { |
5f39d397 | 1016 | struct inode *btree_inode = root->fs_info->btree_inode; |
55c69072 | 1017 | if (btrfs_header_generation(buf) == |
925baedd | 1018 | root->fs_info->running_transaction->transid) { |
b9447ef8 | 1019 | btrfs_assert_tree_locked(buf); |
b4ce94de | 1020 | |
b9473439 CM |
1021 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) { |
1022 | spin_lock(&root->fs_info->delalloc_lock); | |
1023 | if (root->fs_info->dirty_metadata_bytes >= buf->len) | |
1024 | root->fs_info->dirty_metadata_bytes -= buf->len; | |
1025 | else | |
1026 | WARN_ON(1); | |
1027 | spin_unlock(&root->fs_info->delalloc_lock); | |
1028 | } | |
b4ce94de | 1029 | |
b9473439 CM |
1030 | /* ugh, clear_extent_buffer_dirty needs to lock the page */ |
1031 | btrfs_set_lock_blocking(buf); | |
d1310b2e | 1032 | clear_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, |
55c69072 | 1033 | buf); |
925baedd | 1034 | } |
5f39d397 CM |
1035 | return 0; |
1036 | } | |
1037 | ||
db94535d | 1038 | static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize, |
87ee04eb | 1039 | u32 stripesize, struct btrfs_root *root, |
9f5fae2f | 1040 | struct btrfs_fs_info *fs_info, |
e20d96d6 | 1041 | u64 objectid) |
d97e63b6 | 1042 | { |
cfaa7295 | 1043 | root->node = NULL; |
a28ec197 | 1044 | root->commit_root = NULL; |
db94535d CM |
1045 | root->sectorsize = sectorsize; |
1046 | root->nodesize = nodesize; | |
1047 | root->leafsize = leafsize; | |
87ee04eb | 1048 | root->stripesize = stripesize; |
123abc88 | 1049 | root->ref_cows = 0; |
0b86a832 | 1050 | root->track_dirty = 0; |
c71bf099 | 1051 | root->in_radix = 0; |
d68fc57b YZ |
1052 | root->orphan_item_inserted = 0; |
1053 | root->orphan_cleanup_state = 0; | |
0b86a832 | 1054 | |
9f5fae2f | 1055 | root->fs_info = fs_info; |
0f7d52f4 CM |
1056 | root->objectid = objectid; |
1057 | root->last_trans = 0; | |
13a8a7c8 | 1058 | root->highest_objectid = 0; |
58176a96 | 1059 | root->name = NULL; |
4313b399 | 1060 | root->in_sysfs = 0; |
6bef4d31 | 1061 | root->inode_tree = RB_ROOT; |
f0486c68 | 1062 | root->block_rsv = NULL; |
d68fc57b | 1063 | root->orphan_block_rsv = NULL; |
0b86a832 CM |
1064 | |
1065 | INIT_LIST_HEAD(&root->dirty_list); | |
7b128766 | 1066 | INIT_LIST_HEAD(&root->orphan_list); |
5d4f98a2 | 1067 | INIT_LIST_HEAD(&root->root_list); |
925baedd | 1068 | spin_lock_init(&root->node_lock); |
d68fc57b | 1069 | spin_lock_init(&root->orphan_lock); |
5d4f98a2 | 1070 | spin_lock_init(&root->inode_lock); |
f0486c68 | 1071 | spin_lock_init(&root->accounting_lock); |
a2135011 | 1072 | mutex_init(&root->objectid_mutex); |
e02119d5 | 1073 | mutex_init(&root->log_mutex); |
7237f183 YZ |
1074 | init_waitqueue_head(&root->log_writer_wait); |
1075 | init_waitqueue_head(&root->log_commit_wait[0]); | |
1076 | init_waitqueue_head(&root->log_commit_wait[1]); | |
1077 | atomic_set(&root->log_commit[0], 0); | |
1078 | atomic_set(&root->log_commit[1], 0); | |
1079 | atomic_set(&root->log_writers, 0); | |
1080 | root->log_batch = 0; | |
1081 | root->log_transid = 0; | |
257c62e1 | 1082 | root->last_log_commit = 0; |
d0c803c4 CM |
1083 | extent_io_tree_init(&root->dirty_log_pages, |
1084 | fs_info->btree_inode->i_mapping, GFP_NOFS); | |
017e5369 | 1085 | |
3768f368 CM |
1086 | memset(&root->root_key, 0, sizeof(root->root_key)); |
1087 | memset(&root->root_item, 0, sizeof(root->root_item)); | |
6702ed49 | 1088 | memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); |
58176a96 | 1089 | memset(&root->root_kobj, 0, sizeof(root->root_kobj)); |
3f157a2f | 1090 | root->defrag_trans_start = fs_info->generation; |
58176a96 | 1091 | init_completion(&root->kobj_unregister); |
6702ed49 | 1092 | root->defrag_running = 0; |
4d775673 | 1093 | root->root_key.objectid = objectid; |
3394e160 CM |
1094 | root->anon_super.s_root = NULL; |
1095 | root->anon_super.s_dev = 0; | |
1096 | INIT_LIST_HEAD(&root->anon_super.s_list); | |
1097 | INIT_LIST_HEAD(&root->anon_super.s_instances); | |
1098 | init_rwsem(&root->anon_super.s_umount); | |
1099 | ||
3768f368 CM |
1100 | return 0; |
1101 | } | |
1102 | ||
db94535d | 1103 | static int find_and_setup_root(struct btrfs_root *tree_root, |
9f5fae2f CM |
1104 | struct btrfs_fs_info *fs_info, |
1105 | u64 objectid, | |
e20d96d6 | 1106 | struct btrfs_root *root) |
3768f368 CM |
1107 | { |
1108 | int ret; | |
db94535d | 1109 | u32 blocksize; |
84234f3a | 1110 | u64 generation; |
3768f368 | 1111 | |
db94535d | 1112 | __setup_root(tree_root->nodesize, tree_root->leafsize, |
87ee04eb CM |
1113 | tree_root->sectorsize, tree_root->stripesize, |
1114 | root, fs_info, objectid); | |
3768f368 CM |
1115 | ret = btrfs_find_last_root(tree_root, objectid, |
1116 | &root->root_item, &root->root_key); | |
4df27c4d YZ |
1117 | if (ret > 0) |
1118 | return -ENOENT; | |
3768f368 CM |
1119 | BUG_ON(ret); |
1120 | ||
84234f3a | 1121 | generation = btrfs_root_generation(&root->root_item); |
db94535d CM |
1122 | blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); |
1123 | root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), | |
84234f3a | 1124 | blocksize, generation); |
68433b73 CM |
1125 | if (!root->node || !btrfs_buffer_uptodate(root->node, generation)) { |
1126 | free_extent_buffer(root->node); | |
1127 | return -EIO; | |
1128 | } | |
4df27c4d | 1129 | root->commit_root = btrfs_root_node(root); |
d97e63b6 CM |
1130 | return 0; |
1131 | } | |
1132 | ||
7237f183 YZ |
1133 | static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans, |
1134 | struct btrfs_fs_info *fs_info) | |
0f7d52f4 CM |
1135 | { |
1136 | struct btrfs_root *root; | |
1137 | struct btrfs_root *tree_root = fs_info->tree_root; | |
7237f183 | 1138 | struct extent_buffer *leaf; |
e02119d5 CM |
1139 | |
1140 | root = kzalloc(sizeof(*root), GFP_NOFS); | |
1141 | if (!root) | |
7237f183 | 1142 | return ERR_PTR(-ENOMEM); |
e02119d5 CM |
1143 | |
1144 | __setup_root(tree_root->nodesize, tree_root->leafsize, | |
1145 | tree_root->sectorsize, tree_root->stripesize, | |
1146 | root, fs_info, BTRFS_TREE_LOG_OBJECTID); | |
1147 | ||
1148 | root->root_key.objectid = BTRFS_TREE_LOG_OBJECTID; | |
1149 | root->root_key.type = BTRFS_ROOT_ITEM_KEY; | |
1150 | root->root_key.offset = BTRFS_TREE_LOG_OBJECTID; | |
7237f183 YZ |
1151 | /* |
1152 | * log trees do not get reference counted because they go away | |
1153 | * before a real commit is actually done. They do store pointers | |
1154 | * to file data extents, and those reference counts still get | |
1155 | * updated (along with back refs to the log tree). | |
1156 | */ | |
e02119d5 CM |
1157 | root->ref_cows = 0; |
1158 | ||
5d4f98a2 YZ |
1159 | leaf = btrfs_alloc_free_block(trans, root, root->leafsize, 0, |
1160 | BTRFS_TREE_LOG_OBJECTID, NULL, 0, 0, 0); | |
7237f183 YZ |
1161 | if (IS_ERR(leaf)) { |
1162 | kfree(root); | |
1163 | return ERR_CAST(leaf); | |
1164 | } | |
e02119d5 | 1165 | |
5d4f98a2 YZ |
1166 | memset_extent_buffer(leaf, 0, 0, sizeof(struct btrfs_header)); |
1167 | btrfs_set_header_bytenr(leaf, leaf->start); | |
1168 | btrfs_set_header_generation(leaf, trans->transid); | |
1169 | btrfs_set_header_backref_rev(leaf, BTRFS_MIXED_BACKREF_REV); | |
1170 | btrfs_set_header_owner(leaf, BTRFS_TREE_LOG_OBJECTID); | |
7237f183 | 1171 | root->node = leaf; |
e02119d5 CM |
1172 | |
1173 | write_extent_buffer(root->node, root->fs_info->fsid, | |
1174 | (unsigned long)btrfs_header_fsid(root->node), | |
1175 | BTRFS_FSID_SIZE); | |
1176 | btrfs_mark_buffer_dirty(root->node); | |
1177 | btrfs_tree_unlock(root->node); | |
7237f183 YZ |
1178 | return root; |
1179 | } | |
1180 | ||
1181 | int btrfs_init_log_root_tree(struct btrfs_trans_handle *trans, | |
1182 | struct btrfs_fs_info *fs_info) | |
1183 | { | |
1184 | struct btrfs_root *log_root; | |
1185 | ||
1186 | log_root = alloc_log_tree(trans, fs_info); | |
1187 | if (IS_ERR(log_root)) | |
1188 | return PTR_ERR(log_root); | |
1189 | WARN_ON(fs_info->log_root_tree); | |
1190 | fs_info->log_root_tree = log_root; | |
1191 | return 0; | |
1192 | } | |
1193 | ||
1194 | int btrfs_add_log_tree(struct btrfs_trans_handle *trans, | |
1195 | struct btrfs_root *root) | |
1196 | { | |
1197 | struct btrfs_root *log_root; | |
1198 | struct btrfs_inode_item *inode_item; | |
1199 | ||
1200 | log_root = alloc_log_tree(trans, root->fs_info); | |
1201 | if (IS_ERR(log_root)) | |
1202 | return PTR_ERR(log_root); | |
1203 | ||
1204 | log_root->last_trans = trans->transid; | |
1205 | log_root->root_key.offset = root->root_key.objectid; | |
1206 | ||
1207 | inode_item = &log_root->root_item.inode; | |
1208 | inode_item->generation = cpu_to_le64(1); | |
1209 | inode_item->size = cpu_to_le64(3); | |
1210 | inode_item->nlink = cpu_to_le32(1); | |
1211 | inode_item->nbytes = cpu_to_le64(root->leafsize); | |
1212 | inode_item->mode = cpu_to_le32(S_IFDIR | 0755); | |
1213 | ||
5d4f98a2 | 1214 | btrfs_set_root_node(&log_root->root_item, log_root->node); |
7237f183 YZ |
1215 | |
1216 | WARN_ON(root->log_root); | |
1217 | root->log_root = log_root; | |
1218 | root->log_transid = 0; | |
257c62e1 | 1219 | root->last_log_commit = 0; |
e02119d5 CM |
1220 | return 0; |
1221 | } | |
1222 | ||
1223 | struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root, | |
1224 | struct btrfs_key *location) | |
1225 | { | |
1226 | struct btrfs_root *root; | |
1227 | struct btrfs_fs_info *fs_info = tree_root->fs_info; | |
0f7d52f4 | 1228 | struct btrfs_path *path; |
5f39d397 | 1229 | struct extent_buffer *l; |
84234f3a | 1230 | u64 generation; |
db94535d | 1231 | u32 blocksize; |
0f7d52f4 CM |
1232 | int ret = 0; |
1233 | ||
5eda7b5e | 1234 | root = kzalloc(sizeof(*root), GFP_NOFS); |
0cf6c620 | 1235 | if (!root) |
0f7d52f4 | 1236 | return ERR_PTR(-ENOMEM); |
0f7d52f4 | 1237 | if (location->offset == (u64)-1) { |
db94535d | 1238 | ret = find_and_setup_root(tree_root, fs_info, |
0f7d52f4 CM |
1239 | location->objectid, root); |
1240 | if (ret) { | |
0f7d52f4 CM |
1241 | kfree(root); |
1242 | return ERR_PTR(ret); | |
1243 | } | |
13a8a7c8 | 1244 | goto out; |
0f7d52f4 CM |
1245 | } |
1246 | ||
db94535d | 1247 | __setup_root(tree_root->nodesize, tree_root->leafsize, |
87ee04eb CM |
1248 | tree_root->sectorsize, tree_root->stripesize, |
1249 | root, fs_info, location->objectid); | |
0f7d52f4 CM |
1250 | |
1251 | path = btrfs_alloc_path(); | |
db5b493a TI |
1252 | if (!path) { |
1253 | kfree(root); | |
1254 | return ERR_PTR(-ENOMEM); | |
1255 | } | |
0f7d52f4 | 1256 | ret = btrfs_search_slot(NULL, tree_root, location, path, 0, 0); |
13a8a7c8 YZ |
1257 | if (ret == 0) { |
1258 | l = path->nodes[0]; | |
1259 | read_extent_buffer(l, &root->root_item, | |
1260 | btrfs_item_ptr_offset(l, path->slots[0]), | |
1261 | sizeof(root->root_item)); | |
1262 | memcpy(&root->root_key, location, sizeof(*location)); | |
0f7d52f4 | 1263 | } |
0f7d52f4 CM |
1264 | btrfs_free_path(path); |
1265 | if (ret) { | |
5e540f77 | 1266 | kfree(root); |
13a8a7c8 YZ |
1267 | if (ret > 0) |
1268 | ret = -ENOENT; | |
0f7d52f4 CM |
1269 | return ERR_PTR(ret); |
1270 | } | |
13a8a7c8 | 1271 | |
84234f3a | 1272 | generation = btrfs_root_generation(&root->root_item); |
db94535d CM |
1273 | blocksize = btrfs_level_size(root, btrfs_root_level(&root->root_item)); |
1274 | root->node = read_tree_block(root, btrfs_root_bytenr(&root->root_item), | |
84234f3a | 1275 | blocksize, generation); |
5d4f98a2 | 1276 | root->commit_root = btrfs_root_node(root); |
0f7d52f4 | 1277 | BUG_ON(!root->node); |
13a8a7c8 | 1278 | out: |
08fe4db1 | 1279 | if (location->objectid != BTRFS_TREE_LOG_OBJECTID) { |
e02119d5 | 1280 | root->ref_cows = 1; |
08fe4db1 LZ |
1281 | btrfs_check_and_init_root_item(&root->root_item); |
1282 | } | |
13a8a7c8 | 1283 | |
5eda7b5e CM |
1284 | return root; |
1285 | } | |
1286 | ||
dc17ff8f CM |
1287 | struct btrfs_root *btrfs_lookup_fs_root(struct btrfs_fs_info *fs_info, |
1288 | u64 root_objectid) | |
1289 | { | |
1290 | struct btrfs_root *root; | |
1291 | ||
1292 | if (root_objectid == BTRFS_ROOT_TREE_OBJECTID) | |
1293 | return fs_info->tree_root; | |
1294 | if (root_objectid == BTRFS_EXTENT_TREE_OBJECTID) | |
1295 | return fs_info->extent_root; | |
1296 | ||
1297 | root = radix_tree_lookup(&fs_info->fs_roots_radix, | |
1298 | (unsigned long)root_objectid); | |
1299 | return root; | |
1300 | } | |
1301 | ||
edbd8d4e CM |
1302 | struct btrfs_root *btrfs_read_fs_root_no_name(struct btrfs_fs_info *fs_info, |
1303 | struct btrfs_key *location) | |
5eda7b5e CM |
1304 | { |
1305 | struct btrfs_root *root; | |
1306 | int ret; | |
1307 | ||
edbd8d4e CM |
1308 | if (location->objectid == BTRFS_ROOT_TREE_OBJECTID) |
1309 | return fs_info->tree_root; | |
1310 | if (location->objectid == BTRFS_EXTENT_TREE_OBJECTID) | |
1311 | return fs_info->extent_root; | |
8f18cf13 CM |
1312 | if (location->objectid == BTRFS_CHUNK_TREE_OBJECTID) |
1313 | return fs_info->chunk_root; | |
1314 | if (location->objectid == BTRFS_DEV_TREE_OBJECTID) | |
1315 | return fs_info->dev_root; | |
0403e47e YZ |
1316 | if (location->objectid == BTRFS_CSUM_TREE_OBJECTID) |
1317 | return fs_info->csum_root; | |
4df27c4d YZ |
1318 | again: |
1319 | spin_lock(&fs_info->fs_roots_radix_lock); | |
5eda7b5e CM |
1320 | root = radix_tree_lookup(&fs_info->fs_roots_radix, |
1321 | (unsigned long)location->objectid); | |
4df27c4d | 1322 | spin_unlock(&fs_info->fs_roots_radix_lock); |
5eda7b5e CM |
1323 | if (root) |
1324 | return root; | |
1325 | ||
e02119d5 | 1326 | root = btrfs_read_fs_root_no_radix(fs_info->tree_root, location); |
5eda7b5e CM |
1327 | if (IS_ERR(root)) |
1328 | return root; | |
3394e160 CM |
1329 | |
1330 | set_anon_super(&root->anon_super, NULL); | |
1331 | ||
d68fc57b YZ |
1332 | if (btrfs_root_refs(&root->root_item) == 0) { |
1333 | ret = -ENOENT; | |
1334 | goto fail; | |
1335 | } | |
1336 | ||
1337 | ret = btrfs_find_orphan_item(fs_info->tree_root, location->objectid); | |
1338 | if (ret < 0) | |
1339 | goto fail; | |
1340 | if (ret == 0) | |
1341 | root->orphan_item_inserted = 1; | |
1342 | ||
4df27c4d YZ |
1343 | ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); |
1344 | if (ret) | |
1345 | goto fail; | |
1346 | ||
1347 | spin_lock(&fs_info->fs_roots_radix_lock); | |
2619ba1f CM |
1348 | ret = radix_tree_insert(&fs_info->fs_roots_radix, |
1349 | (unsigned long)root->root_key.objectid, | |
0f7d52f4 | 1350 | root); |
d68fc57b | 1351 | if (ret == 0) |
4df27c4d | 1352 | root->in_radix = 1; |
d68fc57b | 1353 | |
4df27c4d YZ |
1354 | spin_unlock(&fs_info->fs_roots_radix_lock); |
1355 | radix_tree_preload_end(); | |
0f7d52f4 | 1356 | if (ret) { |
4df27c4d YZ |
1357 | if (ret == -EEXIST) { |
1358 | free_fs_root(root); | |
1359 | goto again; | |
1360 | } | |
1361 | goto fail; | |
0f7d52f4 | 1362 | } |
4df27c4d YZ |
1363 | |
1364 | ret = btrfs_find_dead_roots(fs_info->tree_root, | |
1365 | root->root_key.objectid); | |
1366 | WARN_ON(ret); | |
edbd8d4e | 1367 | return root; |
4df27c4d YZ |
1368 | fail: |
1369 | free_fs_root(root); | |
1370 | return ERR_PTR(ret); | |
edbd8d4e CM |
1371 | } |
1372 | ||
1373 | struct btrfs_root *btrfs_read_fs_root(struct btrfs_fs_info *fs_info, | |
1374 | struct btrfs_key *location, | |
1375 | const char *name, int namelen) | |
1376 | { | |
4df27c4d YZ |
1377 | return btrfs_read_fs_root_no_name(fs_info, location); |
1378 | #if 0 | |
edbd8d4e CM |
1379 | struct btrfs_root *root; |
1380 | int ret; | |
1381 | ||
1382 | root = btrfs_read_fs_root_no_name(fs_info, location); | |
1383 | if (!root) | |
1384 | return NULL; | |
58176a96 | 1385 | |
4313b399 CM |
1386 | if (root->in_sysfs) |
1387 | return root; | |
1388 | ||
58176a96 JB |
1389 | ret = btrfs_set_root_name(root, name, namelen); |
1390 | if (ret) { | |
5f39d397 | 1391 | free_extent_buffer(root->node); |
58176a96 JB |
1392 | kfree(root); |
1393 | return ERR_PTR(ret); | |
1394 | } | |
4df27c4d | 1395 | |
58176a96 JB |
1396 | ret = btrfs_sysfs_add_root(root); |
1397 | if (ret) { | |
5f39d397 | 1398 | free_extent_buffer(root->node); |
58176a96 JB |
1399 | kfree(root->name); |
1400 | kfree(root); | |
1401 | return ERR_PTR(ret); | |
1402 | } | |
4313b399 | 1403 | root->in_sysfs = 1; |
0f7d52f4 | 1404 | return root; |
4df27c4d | 1405 | #endif |
0f7d52f4 | 1406 | } |
04160088 CM |
1407 | |
1408 | static int btrfs_congested_fn(void *congested_data, int bdi_bits) | |
1409 | { | |
1410 | struct btrfs_fs_info *info = (struct btrfs_fs_info *)congested_data; | |
1411 | int ret = 0; | |
04160088 CM |
1412 | struct btrfs_device *device; |
1413 | struct backing_dev_info *bdi; | |
b7967db7 | 1414 | |
c6e30871 | 1415 | list_for_each_entry(device, &info->fs_devices->devices, dev_list) { |
dfe25020 CM |
1416 | if (!device->bdev) |
1417 | continue; | |
04160088 CM |
1418 | bdi = blk_get_backing_dev_info(device->bdev); |
1419 | if (bdi && bdi_congested(bdi, bdi_bits)) { | |
1420 | ret = 1; | |
1421 | break; | |
1422 | } | |
1423 | } | |
1424 | return ret; | |
1425 | } | |
1426 | ||
38b66988 CM |
1427 | /* |
1428 | * this unplugs every device on the box, and it is only used when page | |
1429 | * is null | |
1430 | */ | |
1431 | static void __unplug_io_fn(struct backing_dev_info *bdi, struct page *page) | |
1432 | { | |
38b66988 CM |
1433 | struct btrfs_device *device; |
1434 | struct btrfs_fs_info *info; | |
1435 | ||
1436 | info = (struct btrfs_fs_info *)bdi->unplug_io_data; | |
c6e30871 | 1437 | list_for_each_entry(device, &info->fs_devices->devices, dev_list) { |
d20f7043 CM |
1438 | if (!device->bdev) |
1439 | continue; | |
1440 | ||
38b66988 | 1441 | bdi = blk_get_backing_dev_info(device->bdev); |
d397712b | 1442 | if (bdi->unplug_io_fn) |
38b66988 | 1443 | bdi->unplug_io_fn(bdi, page); |
38b66988 CM |
1444 | } |
1445 | } | |
1446 | ||
b2950863 | 1447 | static void btrfs_unplug_io_fn(struct backing_dev_info *bdi, struct page *page) |
04160088 | 1448 | { |
38b66988 | 1449 | struct inode *inode; |
f2d8d74d CM |
1450 | struct extent_map_tree *em_tree; |
1451 | struct extent_map *em; | |
bcbfce8a | 1452 | struct address_space *mapping; |
38b66988 CM |
1453 | u64 offset; |
1454 | ||
bcbfce8a | 1455 | /* the generic O_DIRECT read code does this */ |
9f0ba5bd | 1456 | if (1 || !page) { |
38b66988 CM |
1457 | __unplug_io_fn(bdi, page); |
1458 | return; | |
1459 | } | |
1460 | ||
bcbfce8a CM |
1461 | /* |
1462 | * page->mapping may change at any time. Get a consistent copy | |
1463 | * and use that for everything below | |
1464 | */ | |
1465 | smp_mb(); | |
1466 | mapping = page->mapping; | |
1467 | if (!mapping) | |
1468 | return; | |
1469 | ||
1470 | inode = mapping->host; | |
240d5d48 CM |
1471 | |
1472 | /* | |
1473 | * don't do the expensive searching for a small number of | |
1474 | * devices | |
1475 | */ | |
1476 | if (BTRFS_I(inode)->root->fs_info->fs_devices->open_devices <= 2) { | |
1477 | __unplug_io_fn(bdi, page); | |
1478 | return; | |
1479 | } | |
1480 | ||
38b66988 | 1481 | offset = page_offset(page); |
04160088 | 1482 | |
f2d8d74d | 1483 | em_tree = &BTRFS_I(inode)->extent_tree; |
890871be | 1484 | read_lock(&em_tree->lock); |
f2d8d74d | 1485 | em = lookup_extent_mapping(em_tree, offset, PAGE_CACHE_SIZE); |
890871be | 1486 | read_unlock(&em_tree->lock); |
89642229 CM |
1487 | if (!em) { |
1488 | __unplug_io_fn(bdi, page); | |
f2d8d74d | 1489 | return; |
89642229 | 1490 | } |
f2d8d74d | 1491 | |
89642229 CM |
1492 | if (em->block_start >= EXTENT_MAP_LAST_BYTE) { |
1493 | free_extent_map(em); | |
1494 | __unplug_io_fn(bdi, page); | |
1495 | return; | |
1496 | } | |
f2d8d74d CM |
1497 | offset = offset - em->start; |
1498 | btrfs_unplug_page(&BTRFS_I(inode)->root->fs_info->mapping_tree, | |
1499 | em->block_start + offset, page); | |
1500 | free_extent_map(em); | |
04160088 CM |
1501 | } |
1502 | ||
ad081f14 JA |
1503 | /* |
1504 | * If this fails, caller must call bdi_destroy() to get rid of the | |
1505 | * bdi again. | |
1506 | */ | |
04160088 CM |
1507 | static int setup_bdi(struct btrfs_fs_info *info, struct backing_dev_info *bdi) |
1508 | { | |
ad081f14 JA |
1509 | int err; |
1510 | ||
1511 | bdi->capabilities = BDI_CAP_MAP_COPY; | |
e6d086d8 | 1512 | err = bdi_setup_and_register(bdi, "btrfs", BDI_CAP_MAP_COPY); |
ad081f14 JA |
1513 | if (err) |
1514 | return err; | |
1515 | ||
4575c9cc | 1516 | bdi->ra_pages = default_backing_dev_info.ra_pages; |
04160088 CM |
1517 | bdi->unplug_io_fn = btrfs_unplug_io_fn; |
1518 | bdi->unplug_io_data = info; | |
1519 | bdi->congested_fn = btrfs_congested_fn; | |
1520 | bdi->congested_data = info; | |
1521 | return 0; | |
1522 | } | |
1523 | ||
ce9adaa5 CM |
1524 | static int bio_ready_for_csum(struct bio *bio) |
1525 | { | |
1526 | u64 length = 0; | |
1527 | u64 buf_len = 0; | |
1528 | u64 start = 0; | |
1529 | struct page *page; | |
1530 | struct extent_io_tree *io_tree = NULL; | |
ce9adaa5 CM |
1531 | struct bio_vec *bvec; |
1532 | int i; | |
1533 | int ret; | |
1534 | ||
1535 | bio_for_each_segment(bvec, bio, i) { | |
1536 | page = bvec->bv_page; | |
1537 | if (page->private == EXTENT_PAGE_PRIVATE) { | |
1538 | length += bvec->bv_len; | |
1539 | continue; | |
1540 | } | |
1541 | if (!page->private) { | |
1542 | length += bvec->bv_len; | |
1543 | continue; | |
1544 | } | |
1545 | length = bvec->bv_len; | |
1546 | buf_len = page->private >> 2; | |
1547 | start = page_offset(page) + bvec->bv_offset; | |
1548 | io_tree = &BTRFS_I(page->mapping->host)->io_tree; | |
ce9adaa5 CM |
1549 | } |
1550 | /* are we fully contained in this bio? */ | |
1551 | if (buf_len <= length) | |
1552 | return 1; | |
1553 | ||
1554 | ret = extent_range_uptodate(io_tree, start + length, | |
1555 | start + buf_len - 1); | |
ce9adaa5 CM |
1556 | return ret; |
1557 | } | |
1558 | ||
8b712842 CM |
1559 | /* |
1560 | * called by the kthread helper functions to finally call the bio end_io | |
1561 | * functions. This is where read checksum verification actually happens | |
1562 | */ | |
1563 | static void end_workqueue_fn(struct btrfs_work *work) | |
ce9adaa5 | 1564 | { |
ce9adaa5 | 1565 | struct bio *bio; |
8b712842 CM |
1566 | struct end_io_wq *end_io_wq; |
1567 | struct btrfs_fs_info *fs_info; | |
ce9adaa5 | 1568 | int error; |
ce9adaa5 | 1569 | |
8b712842 CM |
1570 | end_io_wq = container_of(work, struct end_io_wq, work); |
1571 | bio = end_io_wq->bio; | |
1572 | fs_info = end_io_wq->info; | |
ce9adaa5 | 1573 | |
cad321ad | 1574 | /* metadata bio reads are special because the whole tree block must |
8b712842 CM |
1575 | * be checksummed at once. This makes sure the entire block is in |
1576 | * ram and up to date before trying to verify things. For | |
1577 | * blocksize <= pagesize, it is basically a noop | |
1578 | */ | |
7b6d91da | 1579 | if (!(bio->bi_rw & REQ_WRITE) && end_io_wq->metadata && |
cad321ad | 1580 | !bio_ready_for_csum(bio)) { |
d20f7043 | 1581 | btrfs_queue_worker(&fs_info->endio_meta_workers, |
8b712842 CM |
1582 | &end_io_wq->work); |
1583 | return; | |
1584 | } | |
1585 | error = end_io_wq->error; | |
1586 | bio->bi_private = end_io_wq->private; | |
1587 | bio->bi_end_io = end_io_wq->end_io; | |
1588 | kfree(end_io_wq); | |
8b712842 | 1589 | bio_endio(bio, error); |
44b8bd7e CM |
1590 | } |
1591 | ||
a74a4b97 CM |
1592 | static int cleaner_kthread(void *arg) |
1593 | { | |
1594 | struct btrfs_root *root = arg; | |
1595 | ||
1596 | do { | |
a74a4b97 | 1597 | vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); |
76dda93c YZ |
1598 | |
1599 | if (!(root->fs_info->sb->s_flags & MS_RDONLY) && | |
1600 | mutex_trylock(&root->fs_info->cleaner_mutex)) { | |
24bbcf04 | 1601 | btrfs_run_delayed_iputs(root); |
76dda93c YZ |
1602 | btrfs_clean_old_snapshots(root); |
1603 | mutex_unlock(&root->fs_info->cleaner_mutex); | |
1604 | } | |
a74a4b97 CM |
1605 | |
1606 | if (freezing(current)) { | |
1607 | refrigerator(); | |
1608 | } else { | |
a74a4b97 | 1609 | set_current_state(TASK_INTERRUPTIBLE); |
8929ecfa YZ |
1610 | if (!kthread_should_stop()) |
1611 | schedule(); | |
a74a4b97 CM |
1612 | __set_current_state(TASK_RUNNING); |
1613 | } | |
1614 | } while (!kthread_should_stop()); | |
1615 | return 0; | |
1616 | } | |
1617 | ||
1618 | static int transaction_kthread(void *arg) | |
1619 | { | |
1620 | struct btrfs_root *root = arg; | |
1621 | struct btrfs_trans_handle *trans; | |
1622 | struct btrfs_transaction *cur; | |
8929ecfa | 1623 | u64 transid; |
a74a4b97 CM |
1624 | unsigned long now; |
1625 | unsigned long delay; | |
1626 | int ret; | |
1627 | ||
1628 | do { | |
a74a4b97 CM |
1629 | delay = HZ * 30; |
1630 | vfs_check_frozen(root->fs_info->sb, SB_FREEZE_WRITE); | |
1631 | mutex_lock(&root->fs_info->transaction_kthread_mutex); | |
1632 | ||
8929ecfa | 1633 | spin_lock(&root->fs_info->new_trans_lock); |
a74a4b97 CM |
1634 | cur = root->fs_info->running_transaction; |
1635 | if (!cur) { | |
8929ecfa | 1636 | spin_unlock(&root->fs_info->new_trans_lock); |
a74a4b97 CM |
1637 | goto sleep; |
1638 | } | |
31153d81 | 1639 | |
a74a4b97 | 1640 | now = get_seconds(); |
8929ecfa YZ |
1641 | if (!cur->blocked && |
1642 | (now < cur->start_time || now - cur->start_time < 30)) { | |
1643 | spin_unlock(&root->fs_info->new_trans_lock); | |
a74a4b97 CM |
1644 | delay = HZ * 5; |
1645 | goto sleep; | |
1646 | } | |
8929ecfa YZ |
1647 | transid = cur->transid; |
1648 | spin_unlock(&root->fs_info->new_trans_lock); | |
56bec294 | 1649 | |
8929ecfa | 1650 | trans = btrfs_join_transaction(root, 1); |
3612b495 | 1651 | BUG_ON(IS_ERR(trans)); |
8929ecfa YZ |
1652 | if (transid == trans->transid) { |
1653 | ret = btrfs_commit_transaction(trans, root); | |
1654 | BUG_ON(ret); | |
1655 | } else { | |
1656 | btrfs_end_transaction(trans, root); | |
1657 | } | |
a74a4b97 CM |
1658 | sleep: |
1659 | wake_up_process(root->fs_info->cleaner_kthread); | |
1660 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
1661 | ||
1662 | if (freezing(current)) { | |
1663 | refrigerator(); | |
1664 | } else { | |
a74a4b97 | 1665 | set_current_state(TASK_INTERRUPTIBLE); |
8929ecfa YZ |
1666 | if (!kthread_should_stop() && |
1667 | !btrfs_transaction_blocked(root->fs_info)) | |
1668 | schedule_timeout(delay); | |
a74a4b97 CM |
1669 | __set_current_state(TASK_RUNNING); |
1670 | } | |
1671 | } while (!kthread_should_stop()); | |
1672 | return 0; | |
1673 | } | |
1674 | ||
8a4b83cc | 1675 | struct btrfs_root *open_ctree(struct super_block *sb, |
dfe25020 CM |
1676 | struct btrfs_fs_devices *fs_devices, |
1677 | char *options) | |
2e635a27 | 1678 | { |
db94535d CM |
1679 | u32 sectorsize; |
1680 | u32 nodesize; | |
1681 | u32 leafsize; | |
1682 | u32 blocksize; | |
87ee04eb | 1683 | u32 stripesize; |
84234f3a | 1684 | u64 generation; |
f2b636e8 | 1685 | u64 features; |
3de4586c | 1686 | struct btrfs_key location; |
a061fc8d | 1687 | struct buffer_head *bh; |
e02119d5 | 1688 | struct btrfs_root *extent_root = kzalloc(sizeof(struct btrfs_root), |
e20d96d6 | 1689 | GFP_NOFS); |
d20f7043 CM |
1690 | struct btrfs_root *csum_root = kzalloc(sizeof(struct btrfs_root), |
1691 | GFP_NOFS); | |
450ba0ea JB |
1692 | struct btrfs_root *tree_root = btrfs_sb(sb); |
1693 | struct btrfs_fs_info *fs_info = tree_root->fs_info; | |
e02119d5 | 1694 | struct btrfs_root *chunk_root = kzalloc(sizeof(struct btrfs_root), |
0b86a832 | 1695 | GFP_NOFS); |
e02119d5 | 1696 | struct btrfs_root *dev_root = kzalloc(sizeof(struct btrfs_root), |
0b86a832 | 1697 | GFP_NOFS); |
e02119d5 CM |
1698 | struct btrfs_root *log_tree_root; |
1699 | ||
eb60ceac | 1700 | int ret; |
e58ca020 | 1701 | int err = -EINVAL; |
4543df7e | 1702 | |
2c90e5d6 | 1703 | struct btrfs_super_block *disk_super; |
8790d502 | 1704 | |
0463bb4e | 1705 | if (!extent_root || !tree_root || !fs_info || |
d20f7043 | 1706 | !chunk_root || !dev_root || !csum_root) { |
39279cc3 CM |
1707 | err = -ENOMEM; |
1708 | goto fail; | |
1709 | } | |
76dda93c YZ |
1710 | |
1711 | ret = init_srcu_struct(&fs_info->subvol_srcu); | |
1712 | if (ret) { | |
1713 | err = ret; | |
1714 | goto fail; | |
1715 | } | |
1716 | ||
1717 | ret = setup_bdi(fs_info, &fs_info->bdi); | |
1718 | if (ret) { | |
1719 | err = ret; | |
1720 | goto fail_srcu; | |
1721 | } | |
1722 | ||
1723 | fs_info->btree_inode = new_inode(sb); | |
1724 | if (!fs_info->btree_inode) { | |
1725 | err = -ENOMEM; | |
1726 | goto fail_bdi; | |
1727 | } | |
1728 | ||
1561deda MX |
1729 | fs_info->btree_inode->i_mapping->flags &= ~__GFP_FS; |
1730 | ||
76dda93c | 1731 | INIT_RADIX_TREE(&fs_info->fs_roots_radix, GFP_ATOMIC); |
8fd17795 | 1732 | INIT_LIST_HEAD(&fs_info->trans_list); |
facda1e7 | 1733 | INIT_LIST_HEAD(&fs_info->dead_roots); |
24bbcf04 | 1734 | INIT_LIST_HEAD(&fs_info->delayed_iputs); |
19c00ddc | 1735 | INIT_LIST_HEAD(&fs_info->hashers); |
ea8c2819 | 1736 | INIT_LIST_HEAD(&fs_info->delalloc_inodes); |
5a3f23d5 | 1737 | INIT_LIST_HEAD(&fs_info->ordered_operations); |
11833d66 | 1738 | INIT_LIST_HEAD(&fs_info->caching_block_groups); |
1832a6d5 | 1739 | spin_lock_init(&fs_info->delalloc_lock); |
cee36a03 | 1740 | spin_lock_init(&fs_info->new_trans_lock); |
31153d81 | 1741 | spin_lock_init(&fs_info->ref_cache_lock); |
76dda93c | 1742 | spin_lock_init(&fs_info->fs_roots_radix_lock); |
24bbcf04 | 1743 | spin_lock_init(&fs_info->delayed_iput_lock); |
19c00ddc | 1744 | |
58176a96 | 1745 | init_completion(&fs_info->kobj_unregister); |
9f5fae2f CM |
1746 | fs_info->tree_root = tree_root; |
1747 | fs_info->extent_root = extent_root; | |
d20f7043 | 1748 | fs_info->csum_root = csum_root; |
0b86a832 CM |
1749 | fs_info->chunk_root = chunk_root; |
1750 | fs_info->dev_root = dev_root; | |
8a4b83cc | 1751 | fs_info->fs_devices = fs_devices; |
0b86a832 | 1752 | INIT_LIST_HEAD(&fs_info->dirty_cowonly_roots); |
6324fbf3 | 1753 | INIT_LIST_HEAD(&fs_info->space_info); |
0b86a832 | 1754 | btrfs_mapping_init(&fs_info->mapping_tree); |
f0486c68 YZ |
1755 | btrfs_init_block_rsv(&fs_info->global_block_rsv); |
1756 | btrfs_init_block_rsv(&fs_info->delalloc_block_rsv); | |
1757 | btrfs_init_block_rsv(&fs_info->trans_block_rsv); | |
1758 | btrfs_init_block_rsv(&fs_info->chunk_block_rsv); | |
1759 | btrfs_init_block_rsv(&fs_info->empty_block_rsv); | |
1760 | INIT_LIST_HEAD(&fs_info->durable_block_rsv_list); | |
1761 | mutex_init(&fs_info->durable_block_rsv_mutex); | |
cb03c743 | 1762 | atomic_set(&fs_info->nr_async_submits, 0); |
771ed689 | 1763 | atomic_set(&fs_info->async_delalloc_pages, 0); |
8c8bee1d | 1764 | atomic_set(&fs_info->async_submit_draining, 0); |
0986fe9e | 1765 | atomic_set(&fs_info->nr_async_bios, 0); |
e20d96d6 | 1766 | fs_info->sb = sb; |
6f568d35 | 1767 | fs_info->max_inline = 8192 * 1024; |
9ed74f2d | 1768 | fs_info->metadata_ratio = 0; |
c8b97818 | 1769 | |
b34b086c CM |
1770 | fs_info->thread_pool_size = min_t(unsigned long, |
1771 | num_online_cpus() + 2, 8); | |
0afbaf8c | 1772 | |
3eaa2885 CM |
1773 | INIT_LIST_HEAD(&fs_info->ordered_extents); |
1774 | spin_lock_init(&fs_info->ordered_extent_lock); | |
1775 | ||
a061fc8d CM |
1776 | sb->s_blocksize = 4096; |
1777 | sb->s_blocksize_bits = blksize_bits(4096); | |
32a88aa1 | 1778 | sb->s_bdi = &fs_info->bdi; |
a061fc8d | 1779 | |
76dda93c YZ |
1780 | fs_info->btree_inode->i_ino = BTRFS_BTREE_INODE_OBJECTID; |
1781 | fs_info->btree_inode->i_nlink = 1; | |
0afbaf8c CM |
1782 | /* |
1783 | * we set the i_size on the btree inode to the max possible int. | |
1784 | * the real end of the address space is determined by all of | |
1785 | * the devices in the system | |
1786 | */ | |
1787 | fs_info->btree_inode->i_size = OFFSET_MAX; | |
d98237b3 | 1788 | fs_info->btree_inode->i_mapping->a_ops = &btree_aops; |
04160088 CM |
1789 | fs_info->btree_inode->i_mapping->backing_dev_info = &fs_info->bdi; |
1790 | ||
5d4f98a2 | 1791 | RB_CLEAR_NODE(&BTRFS_I(fs_info->btree_inode)->rb_node); |
d1310b2e | 1792 | extent_io_tree_init(&BTRFS_I(fs_info->btree_inode)->io_tree, |
5f39d397 CM |
1793 | fs_info->btree_inode->i_mapping, |
1794 | GFP_NOFS); | |
d1310b2e CM |
1795 | extent_map_tree_init(&BTRFS_I(fs_info->btree_inode)->extent_tree, |
1796 | GFP_NOFS); | |
1797 | ||
1798 | BTRFS_I(fs_info->btree_inode)->io_tree.ops = &btree_extent_io_ops; | |
0da5468f | 1799 | |
76dda93c YZ |
1800 | BTRFS_I(fs_info->btree_inode)->root = tree_root; |
1801 | memset(&BTRFS_I(fs_info->btree_inode)->location, 0, | |
1802 | sizeof(struct btrfs_key)); | |
1803 | BTRFS_I(fs_info->btree_inode)->dummy_inode = 1; | |
c65ddb52 | 1804 | insert_inode_hash(fs_info->btree_inode); |
76dda93c | 1805 | |
0f9dd46c | 1806 | spin_lock_init(&fs_info->block_group_cache_lock); |
6bef4d31 | 1807 | fs_info->block_group_cache_tree = RB_ROOT; |
0f9dd46c | 1808 | |
11833d66 | 1809 | extent_io_tree_init(&fs_info->freed_extents[0], |
1a5bc167 | 1810 | fs_info->btree_inode->i_mapping, GFP_NOFS); |
11833d66 YZ |
1811 | extent_io_tree_init(&fs_info->freed_extents[1], |
1812 | fs_info->btree_inode->i_mapping, GFP_NOFS); | |
1813 | fs_info->pinned_extents = &fs_info->freed_extents[0]; | |
e66f709b | 1814 | fs_info->do_barriers = 1; |
e18e4809 | 1815 | |
39279cc3 | 1816 | |
79154b1b | 1817 | mutex_init(&fs_info->trans_mutex); |
5a3f23d5 | 1818 | mutex_init(&fs_info->ordered_operations_mutex); |
e02119d5 | 1819 | mutex_init(&fs_info->tree_log_mutex); |
925baedd | 1820 | mutex_init(&fs_info->chunk_mutex); |
a74a4b97 CM |
1821 | mutex_init(&fs_info->transaction_kthread_mutex); |
1822 | mutex_init(&fs_info->cleaner_mutex); | |
7d9eb12c | 1823 | mutex_init(&fs_info->volume_mutex); |
276e680d | 1824 | init_rwsem(&fs_info->extent_commit_sem); |
c71bf099 | 1825 | init_rwsem(&fs_info->cleanup_work_sem); |
76dda93c | 1826 | init_rwsem(&fs_info->subvol_sem); |
fa9c0d79 CM |
1827 | |
1828 | btrfs_init_free_cluster(&fs_info->meta_alloc_cluster); | |
1829 | btrfs_init_free_cluster(&fs_info->data_alloc_cluster); | |
1830 | ||
e6dcd2dc | 1831 | init_waitqueue_head(&fs_info->transaction_throttle); |
f9295749 | 1832 | init_waitqueue_head(&fs_info->transaction_wait); |
bb9c12c9 | 1833 | init_waitqueue_head(&fs_info->transaction_blocked_wait); |
4854ddd0 | 1834 | init_waitqueue_head(&fs_info->async_submit_wait); |
3768f368 | 1835 | |
0b86a832 | 1836 | __setup_root(4096, 4096, 4096, 4096, tree_root, |
2c90e5d6 | 1837 | fs_info, BTRFS_ROOT_TREE_OBJECTID); |
7eccb903 | 1838 | |
a512bbf8 | 1839 | bh = btrfs_read_dev_super(fs_devices->latest_bdev); |
20b45077 DY |
1840 | if (!bh) { |
1841 | err = -EINVAL; | |
39279cc3 | 1842 | goto fail_iput; |
20b45077 | 1843 | } |
39279cc3 | 1844 | |
a061fc8d | 1845 | memcpy(&fs_info->super_copy, bh->b_data, sizeof(fs_info->super_copy)); |
2d69a0f8 YZ |
1846 | memcpy(&fs_info->super_for_commit, &fs_info->super_copy, |
1847 | sizeof(fs_info->super_for_commit)); | |
a061fc8d | 1848 | brelse(bh); |
5f39d397 | 1849 | |
a061fc8d | 1850 | memcpy(fs_info->fsid, fs_info->super_copy.fsid, BTRFS_FSID_SIZE); |
0b86a832 | 1851 | |
5f39d397 | 1852 | disk_super = &fs_info->super_copy; |
0f7d52f4 | 1853 | if (!btrfs_super_root(disk_super)) |
c6e2bac1 | 1854 | goto fail_iput; |
0f7d52f4 | 1855 | |
acce952b | 1856 | /* check FS state, whether FS is broken. */ |
1857 | fs_info->fs_state |= btrfs_super_flags(disk_super); | |
1858 | ||
1859 | btrfs_check_super_valid(fs_info, sb->s_flags & MS_RDONLY); | |
1860 | ||
75e7cb7f LB |
1861 | /* |
1862 | * In the long term, we'll store the compression type in the super | |
1863 | * block, and it'll be used for per file compression control. | |
1864 | */ | |
1865 | fs_info->compress_type = BTRFS_COMPRESS_ZLIB; | |
1866 | ||
2b82032c YZ |
1867 | ret = btrfs_parse_options(tree_root, options); |
1868 | if (ret) { | |
1869 | err = ret; | |
c6e2bac1 | 1870 | goto fail_iput; |
2b82032c | 1871 | } |
dfe25020 | 1872 | |
f2b636e8 JB |
1873 | features = btrfs_super_incompat_flags(disk_super) & |
1874 | ~BTRFS_FEATURE_INCOMPAT_SUPP; | |
1875 | if (features) { | |
1876 | printk(KERN_ERR "BTRFS: couldn't mount because of " | |
1877 | "unsupported optional features (%Lx).\n", | |
21380931 | 1878 | (unsigned long long)features); |
f2b636e8 | 1879 | err = -EINVAL; |
c6e2bac1 | 1880 | goto fail_iput; |
f2b636e8 JB |
1881 | } |
1882 | ||
5d4f98a2 | 1883 | features = btrfs_super_incompat_flags(disk_super); |
a6fa6fae LZ |
1884 | features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF; |
1885 | if (tree_root->fs_info->compress_type & BTRFS_COMPRESS_LZO) | |
1886 | features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO; | |
1887 | btrfs_set_super_incompat_flags(disk_super, features); | |
5d4f98a2 | 1888 | |
f2b636e8 JB |
1889 | features = btrfs_super_compat_ro_flags(disk_super) & |
1890 | ~BTRFS_FEATURE_COMPAT_RO_SUPP; | |
1891 | if (!(sb->s_flags & MS_RDONLY) && features) { | |
1892 | printk(KERN_ERR "BTRFS: couldn't mount RDWR because of " | |
1893 | "unsupported option features (%Lx).\n", | |
21380931 | 1894 | (unsigned long long)features); |
f2b636e8 | 1895 | err = -EINVAL; |
c6e2bac1 | 1896 | goto fail_iput; |
f2b636e8 | 1897 | } |
61d92c32 CM |
1898 | |
1899 | btrfs_init_workers(&fs_info->generic_worker, | |
1900 | "genwork", 1, NULL); | |
1901 | ||
5443be45 | 1902 | btrfs_init_workers(&fs_info->workers, "worker", |
61d92c32 CM |
1903 | fs_info->thread_pool_size, |
1904 | &fs_info->generic_worker); | |
c8b97818 | 1905 | |
771ed689 | 1906 | btrfs_init_workers(&fs_info->delalloc_workers, "delalloc", |
61d92c32 CM |
1907 | fs_info->thread_pool_size, |
1908 | &fs_info->generic_worker); | |
771ed689 | 1909 | |
5443be45 | 1910 | btrfs_init_workers(&fs_info->submit_workers, "submit", |
b720d209 | 1911 | min_t(u64, fs_devices->num_devices, |
61d92c32 CM |
1912 | fs_info->thread_pool_size), |
1913 | &fs_info->generic_worker); | |
61b49440 CM |
1914 | |
1915 | /* a higher idle thresh on the submit workers makes it much more | |
1916 | * likely that bios will be send down in a sane order to the | |
1917 | * devices | |
1918 | */ | |
1919 | fs_info->submit_workers.idle_thresh = 64; | |
53863232 | 1920 | |
771ed689 | 1921 | fs_info->workers.idle_thresh = 16; |
4a69a410 | 1922 | fs_info->workers.ordered = 1; |
61b49440 | 1923 | |
771ed689 CM |
1924 | fs_info->delalloc_workers.idle_thresh = 2; |
1925 | fs_info->delalloc_workers.ordered = 1; | |
1926 | ||
61d92c32 CM |
1927 | btrfs_init_workers(&fs_info->fixup_workers, "fixup", 1, |
1928 | &fs_info->generic_worker); | |
5443be45 | 1929 | btrfs_init_workers(&fs_info->endio_workers, "endio", |
61d92c32 CM |
1930 | fs_info->thread_pool_size, |
1931 | &fs_info->generic_worker); | |
d20f7043 | 1932 | btrfs_init_workers(&fs_info->endio_meta_workers, "endio-meta", |
61d92c32 CM |
1933 | fs_info->thread_pool_size, |
1934 | &fs_info->generic_worker); | |
cad321ad | 1935 | btrfs_init_workers(&fs_info->endio_meta_write_workers, |
61d92c32 CM |
1936 | "endio-meta-write", fs_info->thread_pool_size, |
1937 | &fs_info->generic_worker); | |
5443be45 | 1938 | btrfs_init_workers(&fs_info->endio_write_workers, "endio-write", |
61d92c32 CM |
1939 | fs_info->thread_pool_size, |
1940 | &fs_info->generic_worker); | |
0cb59c99 JB |
1941 | btrfs_init_workers(&fs_info->endio_freespace_worker, "freespace-write", |
1942 | 1, &fs_info->generic_worker); | |
61b49440 CM |
1943 | |
1944 | /* | |
1945 | * endios are largely parallel and should have a very | |
1946 | * low idle thresh | |
1947 | */ | |
1948 | fs_info->endio_workers.idle_thresh = 4; | |
b51912c9 CM |
1949 | fs_info->endio_meta_workers.idle_thresh = 4; |
1950 | ||
9042846b CM |
1951 | fs_info->endio_write_workers.idle_thresh = 2; |
1952 | fs_info->endio_meta_write_workers.idle_thresh = 2; | |
1953 | ||
4543df7e | 1954 | btrfs_start_workers(&fs_info->workers, 1); |
61d92c32 | 1955 | btrfs_start_workers(&fs_info->generic_worker, 1); |
1cc127b5 | 1956 | btrfs_start_workers(&fs_info->submit_workers, 1); |
771ed689 | 1957 | btrfs_start_workers(&fs_info->delalloc_workers, 1); |
247e743c | 1958 | btrfs_start_workers(&fs_info->fixup_workers, 1); |
9042846b CM |
1959 | btrfs_start_workers(&fs_info->endio_workers, 1); |
1960 | btrfs_start_workers(&fs_info->endio_meta_workers, 1); | |
1961 | btrfs_start_workers(&fs_info->endio_meta_write_workers, 1); | |
1962 | btrfs_start_workers(&fs_info->endio_write_workers, 1); | |
0cb59c99 | 1963 | btrfs_start_workers(&fs_info->endio_freespace_worker, 1); |
4543df7e | 1964 | |
4575c9cc | 1965 | fs_info->bdi.ra_pages *= btrfs_super_num_devices(disk_super); |
c8b97818 CM |
1966 | fs_info->bdi.ra_pages = max(fs_info->bdi.ra_pages, |
1967 | 4 * 1024 * 1024 / PAGE_CACHE_SIZE); | |
4575c9cc | 1968 | |
db94535d CM |
1969 | nodesize = btrfs_super_nodesize(disk_super); |
1970 | leafsize = btrfs_super_leafsize(disk_super); | |
1971 | sectorsize = btrfs_super_sectorsize(disk_super); | |
87ee04eb | 1972 | stripesize = btrfs_super_stripesize(disk_super); |
db94535d CM |
1973 | tree_root->nodesize = nodesize; |
1974 | tree_root->leafsize = leafsize; | |
1975 | tree_root->sectorsize = sectorsize; | |
87ee04eb | 1976 | tree_root->stripesize = stripesize; |
a061fc8d CM |
1977 | |
1978 | sb->s_blocksize = sectorsize; | |
1979 | sb->s_blocksize_bits = blksize_bits(sectorsize); | |
db94535d | 1980 | |
39279cc3 CM |
1981 | if (strncmp((char *)(&disk_super->magic), BTRFS_MAGIC, |
1982 | sizeof(disk_super->magic))) { | |
d397712b | 1983 | printk(KERN_INFO "btrfs: valid FS not found on %s\n", sb->s_id); |
39279cc3 CM |
1984 | goto fail_sb_buffer; |
1985 | } | |
19c00ddc | 1986 | |
925baedd | 1987 | mutex_lock(&fs_info->chunk_mutex); |
e4404d6e | 1988 | ret = btrfs_read_sys_array(tree_root); |
925baedd | 1989 | mutex_unlock(&fs_info->chunk_mutex); |
84eed90f | 1990 | if (ret) { |
d397712b CM |
1991 | printk(KERN_WARNING "btrfs: failed to read the system " |
1992 | "array on %s\n", sb->s_id); | |
5d4f98a2 | 1993 | goto fail_sb_buffer; |
84eed90f | 1994 | } |
0b86a832 CM |
1995 | |
1996 | blocksize = btrfs_level_size(tree_root, | |
1997 | btrfs_super_chunk_root_level(disk_super)); | |
84234f3a | 1998 | generation = btrfs_super_chunk_root_generation(disk_super); |
0b86a832 CM |
1999 | |
2000 | __setup_root(nodesize, leafsize, sectorsize, stripesize, | |
2001 | chunk_root, fs_info, BTRFS_CHUNK_TREE_OBJECTID); | |
2002 | ||
2003 | chunk_root->node = read_tree_block(chunk_root, | |
2004 | btrfs_super_chunk_root(disk_super), | |
84234f3a | 2005 | blocksize, generation); |
0b86a832 | 2006 | BUG_ON(!chunk_root->node); |
83121942 DW |
2007 | if (!test_bit(EXTENT_BUFFER_UPTODATE, &chunk_root->node->bflags)) { |
2008 | printk(KERN_WARNING "btrfs: failed to read chunk root on %s\n", | |
2009 | sb->s_id); | |
2010 | goto fail_chunk_root; | |
2011 | } | |
5d4f98a2 YZ |
2012 | btrfs_set_root_node(&chunk_root->root_item, chunk_root->node); |
2013 | chunk_root->commit_root = btrfs_root_node(chunk_root); | |
0b86a832 | 2014 | |
e17cade2 | 2015 | read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid, |
d397712b CM |
2016 | (unsigned long)btrfs_header_chunk_tree_uuid(chunk_root->node), |
2017 | BTRFS_UUID_SIZE); | |
e17cade2 | 2018 | |
925baedd | 2019 | mutex_lock(&fs_info->chunk_mutex); |
0b86a832 | 2020 | ret = btrfs_read_chunk_tree(chunk_root); |
925baedd | 2021 | mutex_unlock(&fs_info->chunk_mutex); |
2b82032c | 2022 | if (ret) { |
d397712b CM |
2023 | printk(KERN_WARNING "btrfs: failed to read chunk tree on %s\n", |
2024 | sb->s_id); | |
2b82032c YZ |
2025 | goto fail_chunk_root; |
2026 | } | |
0b86a832 | 2027 | |
dfe25020 CM |
2028 | btrfs_close_extra_devices(fs_devices); |
2029 | ||
db94535d CM |
2030 | blocksize = btrfs_level_size(tree_root, |
2031 | btrfs_super_root_level(disk_super)); | |
84234f3a | 2032 | generation = btrfs_super_generation(disk_super); |
0b86a832 | 2033 | |
e20d96d6 | 2034 | tree_root->node = read_tree_block(tree_root, |
db94535d | 2035 | btrfs_super_root(disk_super), |
84234f3a | 2036 | blocksize, generation); |
39279cc3 | 2037 | if (!tree_root->node) |
2b82032c | 2038 | goto fail_chunk_root; |
83121942 DW |
2039 | if (!test_bit(EXTENT_BUFFER_UPTODATE, &tree_root->node->bflags)) { |
2040 | printk(KERN_WARNING "btrfs: failed to read tree root on %s\n", | |
2041 | sb->s_id); | |
2042 | goto fail_tree_root; | |
2043 | } | |
5d4f98a2 YZ |
2044 | btrfs_set_root_node(&tree_root->root_item, tree_root->node); |
2045 | tree_root->commit_root = btrfs_root_node(tree_root); | |
db94535d CM |
2046 | |
2047 | ret = find_and_setup_root(tree_root, fs_info, | |
e20d96d6 | 2048 | BTRFS_EXTENT_TREE_OBJECTID, extent_root); |
0b86a832 | 2049 | if (ret) |
39279cc3 | 2050 | goto fail_tree_root; |
0b86a832 CM |
2051 | extent_root->track_dirty = 1; |
2052 | ||
2053 | ret = find_and_setup_root(tree_root, fs_info, | |
2054 | BTRFS_DEV_TREE_OBJECTID, dev_root); | |
0b86a832 CM |
2055 | if (ret) |
2056 | goto fail_extent_root; | |
5d4f98a2 | 2057 | dev_root->track_dirty = 1; |
3768f368 | 2058 | |
d20f7043 CM |
2059 | ret = find_and_setup_root(tree_root, fs_info, |
2060 | BTRFS_CSUM_TREE_OBJECTID, csum_root); | |
2061 | if (ret) | |
5d4f98a2 | 2062 | goto fail_dev_root; |
d20f7043 CM |
2063 | |
2064 | csum_root->track_dirty = 1; | |
2065 | ||
8929ecfa YZ |
2066 | fs_info->generation = generation; |
2067 | fs_info->last_trans_committed = generation; | |
2068 | fs_info->data_alloc_profile = (u64)-1; | |
2069 | fs_info->metadata_alloc_profile = (u64)-1; | |
2070 | fs_info->system_alloc_profile = fs_info->metadata_alloc_profile; | |
2071 | ||
c59021f8 | 2072 | ret = btrfs_init_space_info(fs_info); |
2073 | if (ret) { | |
2074 | printk(KERN_ERR "Failed to initial space info: %d\n", ret); | |
2075 | goto fail_block_groups; | |
2076 | } | |
2077 | ||
1b1d1f66 JB |
2078 | ret = btrfs_read_block_groups(extent_root); |
2079 | if (ret) { | |
2080 | printk(KERN_ERR "Failed to read block groups: %d\n", ret); | |
2081 | goto fail_block_groups; | |
2082 | } | |
9078a3e1 | 2083 | |
a74a4b97 CM |
2084 | fs_info->cleaner_kthread = kthread_run(cleaner_kthread, tree_root, |
2085 | "btrfs-cleaner"); | |
57506d50 | 2086 | if (IS_ERR(fs_info->cleaner_kthread)) |
1b1d1f66 | 2087 | goto fail_block_groups; |
a74a4b97 CM |
2088 | |
2089 | fs_info->transaction_kthread = kthread_run(transaction_kthread, | |
2090 | tree_root, | |
2091 | "btrfs-transaction"); | |
57506d50 | 2092 | if (IS_ERR(fs_info->transaction_kthread)) |
3f157a2f | 2093 | goto fail_cleaner; |
a74a4b97 | 2094 | |
c289811c CM |
2095 | if (!btrfs_test_opt(tree_root, SSD) && |
2096 | !btrfs_test_opt(tree_root, NOSSD) && | |
2097 | !fs_info->fs_devices->rotating) { | |
2098 | printk(KERN_INFO "Btrfs detected SSD devices, enabling SSD " | |
2099 | "mode\n"); | |
2100 | btrfs_set_opt(fs_info->mount_opt, SSD); | |
2101 | } | |
2102 | ||
acce952b | 2103 | /* do not make disk changes in broken FS */ |
2104 | if (btrfs_super_log_root(disk_super) != 0 && | |
2105 | !(fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR)) { | |
e02119d5 CM |
2106 | u64 bytenr = btrfs_super_log_root(disk_super); |
2107 | ||
7c2ca468 | 2108 | if (fs_devices->rw_devices == 0) { |
d397712b CM |
2109 | printk(KERN_WARNING "Btrfs log replay required " |
2110 | "on RO media\n"); | |
7c2ca468 CM |
2111 | err = -EIO; |
2112 | goto fail_trans_kthread; | |
2113 | } | |
e02119d5 CM |
2114 | blocksize = |
2115 | btrfs_level_size(tree_root, | |
2116 | btrfs_super_log_root_level(disk_super)); | |
d18a2c44 | 2117 | |
676e4c86 DC |
2118 | log_tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS); |
2119 | if (!log_tree_root) { | |
2120 | err = -ENOMEM; | |
2121 | goto fail_trans_kthread; | |
2122 | } | |
e02119d5 CM |
2123 | |
2124 | __setup_root(nodesize, leafsize, sectorsize, stripesize, | |
2125 | log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID); | |
2126 | ||
2127 | log_tree_root->node = read_tree_block(tree_root, bytenr, | |
84234f3a YZ |
2128 | blocksize, |
2129 | generation + 1); | |
e02119d5 CM |
2130 | ret = btrfs_recover_log_trees(log_tree_root); |
2131 | BUG_ON(ret); | |
e556ce2c YZ |
2132 | |
2133 | if (sb->s_flags & MS_RDONLY) { | |
2134 | ret = btrfs_commit_super(tree_root); | |
2135 | BUG_ON(ret); | |
2136 | } | |
e02119d5 | 2137 | } |
1a40e23b | 2138 | |
76dda93c YZ |
2139 | ret = btrfs_find_orphan_roots(tree_root); |
2140 | BUG_ON(ret); | |
2141 | ||
7c2ca468 | 2142 | if (!(sb->s_flags & MS_RDONLY)) { |
d68fc57b YZ |
2143 | ret = btrfs_cleanup_fs_roots(fs_info); |
2144 | BUG_ON(ret); | |
2145 | ||
5d4f98a2 | 2146 | ret = btrfs_recover_relocation(tree_root); |
d7ce5843 MX |
2147 | if (ret < 0) { |
2148 | printk(KERN_WARNING | |
2149 | "btrfs: failed to recover relocation\n"); | |
2150 | err = -EINVAL; | |
2151 | goto fail_trans_kthread; | |
2152 | } | |
7c2ca468 | 2153 | } |
1a40e23b | 2154 | |
3de4586c CM |
2155 | location.objectid = BTRFS_FS_TREE_OBJECTID; |
2156 | location.type = BTRFS_ROOT_ITEM_KEY; | |
2157 | location.offset = (u64)-1; | |
2158 | ||
3de4586c CM |
2159 | fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); |
2160 | if (!fs_info->fs_root) | |
7c2ca468 | 2161 | goto fail_trans_kthread; |
3140c9a3 DC |
2162 | if (IS_ERR(fs_info->fs_root)) { |
2163 | err = PTR_ERR(fs_info->fs_root); | |
2164 | goto fail_trans_kthread; | |
2165 | } | |
c289811c | 2166 | |
e3acc2a6 JB |
2167 | if (!(sb->s_flags & MS_RDONLY)) { |
2168 | down_read(&fs_info->cleanup_work_sem); | |
66b4ffd1 JB |
2169 | err = btrfs_orphan_cleanup(fs_info->fs_root); |
2170 | if (!err) | |
2171 | err = btrfs_orphan_cleanup(fs_info->tree_root); | |
e3acc2a6 | 2172 | up_read(&fs_info->cleanup_work_sem); |
66b4ffd1 JB |
2173 | if (err) { |
2174 | close_ctree(tree_root); | |
2175 | return ERR_PTR(err); | |
2176 | } | |
e3acc2a6 JB |
2177 | } |
2178 | ||
0f7d52f4 | 2179 | return tree_root; |
39279cc3 | 2180 | |
7c2ca468 CM |
2181 | fail_trans_kthread: |
2182 | kthread_stop(fs_info->transaction_kthread); | |
3f157a2f | 2183 | fail_cleaner: |
a74a4b97 | 2184 | kthread_stop(fs_info->cleaner_kthread); |
7c2ca468 CM |
2185 | |
2186 | /* | |
2187 | * make sure we're done with the btree inode before we stop our | |
2188 | * kthreads | |
2189 | */ | |
2190 | filemap_write_and_wait(fs_info->btree_inode->i_mapping); | |
2191 | invalidate_inode_pages2(fs_info->btree_inode->i_mapping); | |
2192 | ||
1b1d1f66 JB |
2193 | fail_block_groups: |
2194 | btrfs_free_block_groups(fs_info); | |
d20f7043 | 2195 | free_extent_buffer(csum_root->node); |
5d4f98a2 YZ |
2196 | free_extent_buffer(csum_root->commit_root); |
2197 | fail_dev_root: | |
2198 | free_extent_buffer(dev_root->node); | |
2199 | free_extent_buffer(dev_root->commit_root); | |
0b86a832 CM |
2200 | fail_extent_root: |
2201 | free_extent_buffer(extent_root->node); | |
5d4f98a2 | 2202 | free_extent_buffer(extent_root->commit_root); |
39279cc3 | 2203 | fail_tree_root: |
5f39d397 | 2204 | free_extent_buffer(tree_root->node); |
5d4f98a2 | 2205 | free_extent_buffer(tree_root->commit_root); |
2b82032c YZ |
2206 | fail_chunk_root: |
2207 | free_extent_buffer(chunk_root->node); | |
5d4f98a2 | 2208 | free_extent_buffer(chunk_root->commit_root); |
39279cc3 | 2209 | fail_sb_buffer: |
61d92c32 | 2210 | btrfs_stop_workers(&fs_info->generic_worker); |
247e743c | 2211 | btrfs_stop_workers(&fs_info->fixup_workers); |
771ed689 | 2212 | btrfs_stop_workers(&fs_info->delalloc_workers); |
8b712842 CM |
2213 | btrfs_stop_workers(&fs_info->workers); |
2214 | btrfs_stop_workers(&fs_info->endio_workers); | |
d20f7043 | 2215 | btrfs_stop_workers(&fs_info->endio_meta_workers); |
cad321ad | 2216 | btrfs_stop_workers(&fs_info->endio_meta_write_workers); |
e6dcd2dc | 2217 | btrfs_stop_workers(&fs_info->endio_write_workers); |
0cb59c99 | 2218 | btrfs_stop_workers(&fs_info->endio_freespace_worker); |
1cc127b5 | 2219 | btrfs_stop_workers(&fs_info->submit_workers); |
4543df7e | 2220 | fail_iput: |
7c2ca468 | 2221 | invalidate_inode_pages2(fs_info->btree_inode->i_mapping); |
4543df7e | 2222 | iput(fs_info->btree_inode); |
7e662854 | 2223 | |
dfe25020 | 2224 | btrfs_close_devices(fs_info->fs_devices); |
84eed90f | 2225 | btrfs_mapping_tree_free(&fs_info->mapping_tree); |
ad081f14 | 2226 | fail_bdi: |
7e662854 | 2227 | bdi_destroy(&fs_info->bdi); |
76dda93c YZ |
2228 | fail_srcu: |
2229 | cleanup_srcu_struct(&fs_info->subvol_srcu); | |
7e662854 | 2230 | fail: |
39279cc3 CM |
2231 | kfree(extent_root); |
2232 | kfree(tree_root); | |
2233 | kfree(fs_info); | |
83afeac4 JM |
2234 | kfree(chunk_root); |
2235 | kfree(dev_root); | |
d20f7043 | 2236 | kfree(csum_root); |
39279cc3 | 2237 | return ERR_PTR(err); |
eb60ceac CM |
2238 | } |
2239 | ||
f2984462 CM |
2240 | static void btrfs_end_buffer_write_sync(struct buffer_head *bh, int uptodate) |
2241 | { | |
2242 | char b[BDEVNAME_SIZE]; | |
2243 | ||
2244 | if (uptodate) { | |
2245 | set_buffer_uptodate(bh); | |
2246 | } else { | |
c3b9a62c | 2247 | if (printk_ratelimit()) { |
f2984462 CM |
2248 | printk(KERN_WARNING "lost page write due to " |
2249 | "I/O error on %s\n", | |
2250 | bdevname(bh->b_bdev, b)); | |
2251 | } | |
1259ab75 CM |
2252 | /* note, we dont' set_buffer_write_io_error because we have |
2253 | * our own ways of dealing with the IO errors | |
2254 | */ | |
f2984462 CM |
2255 | clear_buffer_uptodate(bh); |
2256 | } | |
2257 | unlock_buffer(bh); | |
2258 | put_bh(bh); | |
2259 | } | |
2260 | ||
a512bbf8 YZ |
2261 | struct buffer_head *btrfs_read_dev_super(struct block_device *bdev) |
2262 | { | |
2263 | struct buffer_head *bh; | |
2264 | struct buffer_head *latest = NULL; | |
2265 | struct btrfs_super_block *super; | |
2266 | int i; | |
2267 | u64 transid = 0; | |
2268 | u64 bytenr; | |
2269 | ||
2270 | /* we would like to check all the supers, but that would make | |
2271 | * a btrfs mount succeed after a mkfs from a different FS. | |
2272 | * So, we need to add a special mount option to scan for | |
2273 | * later supers, using BTRFS_SUPER_MIRROR_MAX instead | |
2274 | */ | |
2275 | for (i = 0; i < 1; i++) { | |
2276 | bytenr = btrfs_sb_offset(i); | |
2277 | if (bytenr + 4096 >= i_size_read(bdev->bd_inode)) | |
2278 | break; | |
2279 | bh = __bread(bdev, bytenr / 4096, 4096); | |
2280 | if (!bh) | |
2281 | continue; | |
2282 | ||
2283 | super = (struct btrfs_super_block *)bh->b_data; | |
2284 | if (btrfs_super_bytenr(super) != bytenr || | |
2285 | strncmp((char *)(&super->magic), BTRFS_MAGIC, | |
2286 | sizeof(super->magic))) { | |
2287 | brelse(bh); | |
2288 | continue; | |
2289 | } | |
2290 | ||
2291 | if (!latest || btrfs_super_generation(super) > transid) { | |
2292 | brelse(latest); | |
2293 | latest = bh; | |
2294 | transid = btrfs_super_generation(super); | |
2295 | } else { | |
2296 | brelse(bh); | |
2297 | } | |
2298 | } | |
2299 | return latest; | |
2300 | } | |
2301 | ||
4eedeb75 HH |
2302 | /* |
2303 | * this should be called twice, once with wait == 0 and | |
2304 | * once with wait == 1. When wait == 0 is done, all the buffer heads | |
2305 | * we write are pinned. | |
2306 | * | |
2307 | * They are released when wait == 1 is done. | |
2308 | * max_mirrors must be the same for both runs, and it indicates how | |
2309 | * many supers on this one device should be written. | |
2310 | * | |
2311 | * max_mirrors == 0 means to write them all. | |
2312 | */ | |
a512bbf8 YZ |
2313 | static int write_dev_supers(struct btrfs_device *device, |
2314 | struct btrfs_super_block *sb, | |
2315 | int do_barriers, int wait, int max_mirrors) | |
2316 | { | |
2317 | struct buffer_head *bh; | |
2318 | int i; | |
2319 | int ret; | |
2320 | int errors = 0; | |
2321 | u32 crc; | |
2322 | u64 bytenr; | |
2323 | int last_barrier = 0; | |
2324 | ||
2325 | if (max_mirrors == 0) | |
2326 | max_mirrors = BTRFS_SUPER_MIRROR_MAX; | |
2327 | ||
2328 | /* make sure only the last submit_bh does a barrier */ | |
2329 | if (do_barriers) { | |
2330 | for (i = 0; i < max_mirrors; i++) { | |
2331 | bytenr = btrfs_sb_offset(i); | |
2332 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= | |
2333 | device->total_bytes) | |
2334 | break; | |
2335 | last_barrier = i; | |
2336 | } | |
2337 | } | |
2338 | ||
2339 | for (i = 0; i < max_mirrors; i++) { | |
2340 | bytenr = btrfs_sb_offset(i); | |
2341 | if (bytenr + BTRFS_SUPER_INFO_SIZE >= device->total_bytes) | |
2342 | break; | |
2343 | ||
2344 | if (wait) { | |
2345 | bh = __find_get_block(device->bdev, bytenr / 4096, | |
2346 | BTRFS_SUPER_INFO_SIZE); | |
2347 | BUG_ON(!bh); | |
a512bbf8 | 2348 | wait_on_buffer(bh); |
4eedeb75 HH |
2349 | if (!buffer_uptodate(bh)) |
2350 | errors++; | |
2351 | ||
2352 | /* drop our reference */ | |
2353 | brelse(bh); | |
2354 | ||
2355 | /* drop the reference from the wait == 0 run */ | |
2356 | brelse(bh); | |
2357 | continue; | |
a512bbf8 YZ |
2358 | } else { |
2359 | btrfs_set_super_bytenr(sb, bytenr); | |
2360 | ||
2361 | crc = ~(u32)0; | |
2362 | crc = btrfs_csum_data(NULL, (char *)sb + | |
2363 | BTRFS_CSUM_SIZE, crc, | |
2364 | BTRFS_SUPER_INFO_SIZE - | |
2365 | BTRFS_CSUM_SIZE); | |
2366 | btrfs_csum_final(crc, sb->csum); | |
2367 | ||
4eedeb75 HH |
2368 | /* |
2369 | * one reference for us, and we leave it for the | |
2370 | * caller | |
2371 | */ | |
a512bbf8 YZ |
2372 | bh = __getblk(device->bdev, bytenr / 4096, |
2373 | BTRFS_SUPER_INFO_SIZE); | |
2374 | memcpy(bh->b_data, sb, BTRFS_SUPER_INFO_SIZE); | |
2375 | ||
4eedeb75 | 2376 | /* one reference for submit_bh */ |
a512bbf8 | 2377 | get_bh(bh); |
4eedeb75 HH |
2378 | |
2379 | set_buffer_uptodate(bh); | |
a512bbf8 YZ |
2380 | lock_buffer(bh); |
2381 | bh->b_end_io = btrfs_end_buffer_write_sync; | |
2382 | } | |
2383 | ||
c3b9a62c CH |
2384 | if (i == last_barrier && do_barriers) |
2385 | ret = submit_bh(WRITE_FLUSH_FUA, bh); | |
2386 | else | |
ffbd517d | 2387 | ret = submit_bh(WRITE_SYNC, bh); |
a512bbf8 | 2388 | |
4eedeb75 | 2389 | if (ret) |
a512bbf8 | 2390 | errors++; |
a512bbf8 YZ |
2391 | } |
2392 | return errors < i ? 0 : -1; | |
2393 | } | |
2394 | ||
2395 | int write_all_supers(struct btrfs_root *root, int max_mirrors) | |
f2984462 | 2396 | { |
e5e9a520 | 2397 | struct list_head *head; |
f2984462 | 2398 | struct btrfs_device *dev; |
a061fc8d | 2399 | struct btrfs_super_block *sb; |
f2984462 | 2400 | struct btrfs_dev_item *dev_item; |
f2984462 CM |
2401 | int ret; |
2402 | int do_barriers; | |
a236aed1 CM |
2403 | int max_errors; |
2404 | int total_errors = 0; | |
a061fc8d | 2405 | u64 flags; |
f2984462 | 2406 | |
a236aed1 | 2407 | max_errors = btrfs_super_num_devices(&root->fs_info->super_copy) - 1; |
f2984462 CM |
2408 | do_barriers = !btrfs_test_opt(root, NOBARRIER); |
2409 | ||
a061fc8d CM |
2410 | sb = &root->fs_info->super_for_commit; |
2411 | dev_item = &sb->dev_item; | |
e5e9a520 CM |
2412 | |
2413 | mutex_lock(&root->fs_info->fs_devices->device_list_mutex); | |
2414 | head = &root->fs_info->fs_devices->devices; | |
c6e30871 | 2415 | list_for_each_entry(dev, head, dev_list) { |
dfe25020 CM |
2416 | if (!dev->bdev) { |
2417 | total_errors++; | |
2418 | continue; | |
2419 | } | |
2b82032c | 2420 | if (!dev->in_fs_metadata || !dev->writeable) |
dfe25020 CM |
2421 | continue; |
2422 | ||
2b82032c | 2423 | btrfs_set_stack_device_generation(dev_item, 0); |
a061fc8d CM |
2424 | btrfs_set_stack_device_type(dev_item, dev->type); |
2425 | btrfs_set_stack_device_id(dev_item, dev->devid); | |
2426 | btrfs_set_stack_device_total_bytes(dev_item, dev->total_bytes); | |
2427 | btrfs_set_stack_device_bytes_used(dev_item, dev->bytes_used); | |
2428 | btrfs_set_stack_device_io_align(dev_item, dev->io_align); | |
2429 | btrfs_set_stack_device_io_width(dev_item, dev->io_width); | |
2430 | btrfs_set_stack_device_sector_size(dev_item, dev->sector_size); | |
2431 | memcpy(dev_item->uuid, dev->uuid, BTRFS_UUID_SIZE); | |
2b82032c | 2432 | memcpy(dev_item->fsid, dev->fs_devices->fsid, BTRFS_UUID_SIZE); |
a512bbf8 | 2433 | |
a061fc8d CM |
2434 | flags = btrfs_super_flags(sb); |
2435 | btrfs_set_super_flags(sb, flags | BTRFS_HEADER_FLAG_WRITTEN); | |
2436 | ||
a512bbf8 | 2437 | ret = write_dev_supers(dev, sb, do_barriers, 0, max_mirrors); |
a236aed1 CM |
2438 | if (ret) |
2439 | total_errors++; | |
f2984462 | 2440 | } |
a236aed1 | 2441 | if (total_errors > max_errors) { |
d397712b CM |
2442 | printk(KERN_ERR "btrfs: %d errors while writing supers\n", |
2443 | total_errors); | |
a236aed1 CM |
2444 | BUG(); |
2445 | } | |
f2984462 | 2446 | |
a512bbf8 | 2447 | total_errors = 0; |
c6e30871 | 2448 | list_for_each_entry(dev, head, dev_list) { |
dfe25020 CM |
2449 | if (!dev->bdev) |
2450 | continue; | |
2b82032c | 2451 | if (!dev->in_fs_metadata || !dev->writeable) |
dfe25020 CM |
2452 | continue; |
2453 | ||
a512bbf8 YZ |
2454 | ret = write_dev_supers(dev, sb, do_barriers, 1, max_mirrors); |
2455 | if (ret) | |
2456 | total_errors++; | |
f2984462 | 2457 | } |
e5e9a520 | 2458 | mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); |
a236aed1 | 2459 | if (total_errors > max_errors) { |
d397712b CM |
2460 | printk(KERN_ERR "btrfs: %d errors while writing supers\n", |
2461 | total_errors); | |
a236aed1 CM |
2462 | BUG(); |
2463 | } | |
f2984462 CM |
2464 | return 0; |
2465 | } | |
2466 | ||
a512bbf8 YZ |
2467 | int write_ctree_super(struct btrfs_trans_handle *trans, |
2468 | struct btrfs_root *root, int max_mirrors) | |
eb60ceac | 2469 | { |
e66f709b | 2470 | int ret; |
5f39d397 | 2471 | |
a512bbf8 | 2472 | ret = write_all_supers(root, max_mirrors); |
5f39d397 | 2473 | return ret; |
cfaa7295 CM |
2474 | } |
2475 | ||
5eda7b5e | 2476 | int btrfs_free_fs_root(struct btrfs_fs_info *fs_info, struct btrfs_root *root) |
2619ba1f | 2477 | { |
4df27c4d | 2478 | spin_lock(&fs_info->fs_roots_radix_lock); |
2619ba1f CM |
2479 | radix_tree_delete(&fs_info->fs_roots_radix, |
2480 | (unsigned long)root->root_key.objectid); | |
4df27c4d | 2481 | spin_unlock(&fs_info->fs_roots_radix_lock); |
76dda93c YZ |
2482 | |
2483 | if (btrfs_root_refs(&root->root_item) == 0) | |
2484 | synchronize_srcu(&fs_info->subvol_srcu); | |
2485 | ||
4df27c4d YZ |
2486 | free_fs_root(root); |
2487 | return 0; | |
2488 | } | |
2489 | ||
2490 | static void free_fs_root(struct btrfs_root *root) | |
2491 | { | |
2492 | WARN_ON(!RB_EMPTY_ROOT(&root->inode_tree)); | |
3394e160 CM |
2493 | if (root->anon_super.s_dev) { |
2494 | down_write(&root->anon_super.s_umount); | |
2495 | kill_anon_super(&root->anon_super); | |
2496 | } | |
4df27c4d YZ |
2497 | free_extent_buffer(root->node); |
2498 | free_extent_buffer(root->commit_root); | |
d397712b | 2499 | kfree(root->name); |
2619ba1f | 2500 | kfree(root); |
2619ba1f CM |
2501 | } |
2502 | ||
35b7e476 | 2503 | static int del_fs_roots(struct btrfs_fs_info *fs_info) |
0f7d52f4 CM |
2504 | { |
2505 | int ret; | |
2506 | struct btrfs_root *gang[8]; | |
2507 | int i; | |
2508 | ||
76dda93c YZ |
2509 | while (!list_empty(&fs_info->dead_roots)) { |
2510 | gang[0] = list_entry(fs_info->dead_roots.next, | |
2511 | struct btrfs_root, root_list); | |
2512 | list_del(&gang[0]->root_list); | |
2513 | ||
2514 | if (gang[0]->in_radix) { | |
2515 | btrfs_free_fs_root(fs_info, gang[0]); | |
2516 | } else { | |
2517 | free_extent_buffer(gang[0]->node); | |
2518 | free_extent_buffer(gang[0]->commit_root); | |
2519 | kfree(gang[0]); | |
2520 | } | |
2521 | } | |
2522 | ||
d397712b | 2523 | while (1) { |
0f7d52f4 CM |
2524 | ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, |
2525 | (void **)gang, 0, | |
2526 | ARRAY_SIZE(gang)); | |
2527 | if (!ret) | |
2528 | break; | |
2619ba1f | 2529 | for (i = 0; i < ret; i++) |
5eda7b5e | 2530 | btrfs_free_fs_root(fs_info, gang[i]); |
0f7d52f4 CM |
2531 | } |
2532 | return 0; | |
2533 | } | |
b4100d64 | 2534 | |
c146afad | 2535 | int btrfs_cleanup_fs_roots(struct btrfs_fs_info *fs_info) |
cfaa7295 | 2536 | { |
c146afad YZ |
2537 | u64 root_objectid = 0; |
2538 | struct btrfs_root *gang[8]; | |
2539 | int i; | |
3768f368 | 2540 | int ret; |
e089f05c | 2541 | |
c146afad YZ |
2542 | while (1) { |
2543 | ret = radix_tree_gang_lookup(&fs_info->fs_roots_radix, | |
2544 | (void **)gang, root_objectid, | |
2545 | ARRAY_SIZE(gang)); | |
2546 | if (!ret) | |
2547 | break; | |
5d4f98a2 YZ |
2548 | |
2549 | root_objectid = gang[ret - 1]->root_key.objectid + 1; | |
c146afad | 2550 | for (i = 0; i < ret; i++) { |
66b4ffd1 JB |
2551 | int err; |
2552 | ||
c146afad | 2553 | root_objectid = gang[i]->root_key.objectid; |
66b4ffd1 JB |
2554 | err = btrfs_orphan_cleanup(gang[i]); |
2555 | if (err) | |
2556 | return err; | |
c146afad YZ |
2557 | } |
2558 | root_objectid++; | |
2559 | } | |
2560 | return 0; | |
2561 | } | |
a2135011 | 2562 | |
c146afad YZ |
2563 | int btrfs_commit_super(struct btrfs_root *root) |
2564 | { | |
2565 | struct btrfs_trans_handle *trans; | |
2566 | int ret; | |
a74a4b97 | 2567 | |
c146afad | 2568 | mutex_lock(&root->fs_info->cleaner_mutex); |
24bbcf04 | 2569 | btrfs_run_delayed_iputs(root); |
a74a4b97 | 2570 | btrfs_clean_old_snapshots(root); |
c146afad | 2571 | mutex_unlock(&root->fs_info->cleaner_mutex); |
c71bf099 YZ |
2572 | |
2573 | /* wait until ongoing cleanup work done */ | |
2574 | down_write(&root->fs_info->cleanup_work_sem); | |
2575 | up_write(&root->fs_info->cleanup_work_sem); | |
2576 | ||
a22285a6 | 2577 | trans = btrfs_join_transaction(root, 1); |
3612b495 TI |
2578 | if (IS_ERR(trans)) |
2579 | return PTR_ERR(trans); | |
54aa1f4d | 2580 | ret = btrfs_commit_transaction(trans, root); |
c146afad YZ |
2581 | BUG_ON(ret); |
2582 | /* run commit again to drop the original snapshot */ | |
a22285a6 | 2583 | trans = btrfs_join_transaction(root, 1); |
3612b495 TI |
2584 | if (IS_ERR(trans)) |
2585 | return PTR_ERR(trans); | |
79154b1b CM |
2586 | btrfs_commit_transaction(trans, root); |
2587 | ret = btrfs_write_and_wait_transaction(NULL, root); | |
3768f368 | 2588 | BUG_ON(ret); |
d6bfde87 | 2589 | |
a512bbf8 | 2590 | ret = write_ctree_super(NULL, root, 0); |
c146afad YZ |
2591 | return ret; |
2592 | } | |
2593 | ||
2594 | int close_ctree(struct btrfs_root *root) | |
2595 | { | |
2596 | struct btrfs_fs_info *fs_info = root->fs_info; | |
2597 | int ret; | |
2598 | ||
2599 | fs_info->closing = 1; | |
2600 | smp_mb(); | |
2601 | ||
0af3d00b | 2602 | btrfs_put_block_group_cache(fs_info); |
acce952b | 2603 | |
2604 | /* | |
2605 | * Here come 2 situations when btrfs is broken to flip readonly: | |
2606 | * | |
2607 | * 1. when btrfs flips readonly somewhere else before | |
2608 | * btrfs_commit_super, sb->s_flags has MS_RDONLY flag, | |
2609 | * and btrfs will skip to write sb directly to keep | |
2610 | * ERROR state on disk. | |
2611 | * | |
2612 | * 2. when btrfs flips readonly just in btrfs_commit_super, | |
2613 | * and in such case, btrfs cannnot write sb via btrfs_commit_super, | |
2614 | * and since fs_state has been set BTRFS_SUPER_FLAG_ERROR flag, | |
2615 | * btrfs will cleanup all FS resources first and write sb then. | |
2616 | */ | |
c146afad | 2617 | if (!(fs_info->sb->s_flags & MS_RDONLY)) { |
acce952b | 2618 | ret = btrfs_commit_super(root); |
2619 | if (ret) | |
2620 | printk(KERN_ERR "btrfs: commit super ret %d\n", ret); | |
2621 | } | |
2622 | ||
2623 | if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) { | |
2624 | ret = btrfs_error_commit_super(root); | |
d397712b CM |
2625 | if (ret) |
2626 | printk(KERN_ERR "btrfs: commit super ret %d\n", ret); | |
c146afad | 2627 | } |
0f7d52f4 | 2628 | |
8929ecfa YZ |
2629 | kthread_stop(root->fs_info->transaction_kthread); |
2630 | kthread_stop(root->fs_info->cleaner_kthread); | |
2631 | ||
f25784b3 YZ |
2632 | fs_info->closing = 2; |
2633 | smp_mb(); | |
2634 | ||
b0c68f8b | 2635 | if (fs_info->delalloc_bytes) { |
d397712b | 2636 | printk(KERN_INFO "btrfs: at unmount delalloc count %llu\n", |
21380931 | 2637 | (unsigned long long)fs_info->delalloc_bytes); |
b0c68f8b | 2638 | } |
31153d81 | 2639 | if (fs_info->total_ref_cache_size) { |
d397712b CM |
2640 | printk(KERN_INFO "btrfs: at umount reference cache size %llu\n", |
2641 | (unsigned long long)fs_info->total_ref_cache_size); | |
31153d81 | 2642 | } |
bcc63abb | 2643 | |
5d4f98a2 YZ |
2644 | free_extent_buffer(fs_info->extent_root->node); |
2645 | free_extent_buffer(fs_info->extent_root->commit_root); | |
2646 | free_extent_buffer(fs_info->tree_root->node); | |
2647 | free_extent_buffer(fs_info->tree_root->commit_root); | |
2648 | free_extent_buffer(root->fs_info->chunk_root->node); | |
2649 | free_extent_buffer(root->fs_info->chunk_root->commit_root); | |
2650 | free_extent_buffer(root->fs_info->dev_root->node); | |
2651 | free_extent_buffer(root->fs_info->dev_root->commit_root); | |
2652 | free_extent_buffer(root->fs_info->csum_root->node); | |
2653 | free_extent_buffer(root->fs_info->csum_root->commit_root); | |
d20f7043 | 2654 | |
9078a3e1 | 2655 | btrfs_free_block_groups(root->fs_info); |
d10c5f31 | 2656 | |
c146afad | 2657 | del_fs_roots(fs_info); |
d10c5f31 | 2658 | |
c146afad | 2659 | iput(fs_info->btree_inode); |
9ad6b7bc | 2660 | |
61d92c32 | 2661 | btrfs_stop_workers(&fs_info->generic_worker); |
247e743c | 2662 | btrfs_stop_workers(&fs_info->fixup_workers); |
771ed689 | 2663 | btrfs_stop_workers(&fs_info->delalloc_workers); |
8b712842 CM |
2664 | btrfs_stop_workers(&fs_info->workers); |
2665 | btrfs_stop_workers(&fs_info->endio_workers); | |
d20f7043 | 2666 | btrfs_stop_workers(&fs_info->endio_meta_workers); |
cad321ad | 2667 | btrfs_stop_workers(&fs_info->endio_meta_write_workers); |
e6dcd2dc | 2668 | btrfs_stop_workers(&fs_info->endio_write_workers); |
0cb59c99 | 2669 | btrfs_stop_workers(&fs_info->endio_freespace_worker); |
1cc127b5 | 2670 | btrfs_stop_workers(&fs_info->submit_workers); |
d6bfde87 | 2671 | |
dfe25020 | 2672 | btrfs_close_devices(fs_info->fs_devices); |
0b86a832 | 2673 | btrfs_mapping_tree_free(&fs_info->mapping_tree); |
b248a415 | 2674 | |
04160088 | 2675 | bdi_destroy(&fs_info->bdi); |
76dda93c | 2676 | cleanup_srcu_struct(&fs_info->subvol_srcu); |
0b86a832 | 2677 | |
0f7d52f4 | 2678 | kfree(fs_info->extent_root); |
0f7d52f4 | 2679 | kfree(fs_info->tree_root); |
0b86a832 CM |
2680 | kfree(fs_info->chunk_root); |
2681 | kfree(fs_info->dev_root); | |
d20f7043 | 2682 | kfree(fs_info->csum_root); |
83a4d548 LZ |
2683 | kfree(fs_info); |
2684 | ||
eb60ceac CM |
2685 | return 0; |
2686 | } | |
2687 | ||
1259ab75 | 2688 | int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid) |
5f39d397 | 2689 | { |
1259ab75 | 2690 | int ret; |
810191ff | 2691 | struct inode *btree_inode = buf->first_page->mapping->host; |
1259ab75 | 2692 | |
2ac55d41 JB |
2693 | ret = extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, buf, |
2694 | NULL); | |
1259ab75 CM |
2695 | if (!ret) |
2696 | return ret; | |
2697 | ||
2698 | ret = verify_parent_transid(&BTRFS_I(btree_inode)->io_tree, buf, | |
2699 | parent_transid); | |
2700 | return !ret; | |
5f39d397 CM |
2701 | } |
2702 | ||
2703 | int btrfs_set_buffer_uptodate(struct extent_buffer *buf) | |
ccd467d6 | 2704 | { |
810191ff | 2705 | struct inode *btree_inode = buf->first_page->mapping->host; |
d1310b2e | 2706 | return set_extent_buffer_uptodate(&BTRFS_I(btree_inode)->io_tree, |
5f39d397 CM |
2707 | buf); |
2708 | } | |
6702ed49 | 2709 | |
5f39d397 CM |
2710 | void btrfs_mark_buffer_dirty(struct extent_buffer *buf) |
2711 | { | |
810191ff | 2712 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
5f39d397 CM |
2713 | u64 transid = btrfs_header_generation(buf); |
2714 | struct inode *btree_inode = root->fs_info->btree_inode; | |
b9473439 | 2715 | int was_dirty; |
b4ce94de | 2716 | |
b9447ef8 | 2717 | btrfs_assert_tree_locked(buf); |
ccd467d6 | 2718 | if (transid != root->fs_info->generation) { |
d397712b CM |
2719 | printk(KERN_CRIT "btrfs transid mismatch buffer %llu, " |
2720 | "found %llu running %llu\n", | |
db94535d | 2721 | (unsigned long long)buf->start, |
d397712b CM |
2722 | (unsigned long long)transid, |
2723 | (unsigned long long)root->fs_info->generation); | |
ccd467d6 CM |
2724 | WARN_ON(1); |
2725 | } | |
b9473439 CM |
2726 | was_dirty = set_extent_buffer_dirty(&BTRFS_I(btree_inode)->io_tree, |
2727 | buf); | |
2728 | if (!was_dirty) { | |
2729 | spin_lock(&root->fs_info->delalloc_lock); | |
2730 | root->fs_info->dirty_metadata_bytes += buf->len; | |
2731 | spin_unlock(&root->fs_info->delalloc_lock); | |
2732 | } | |
eb60ceac CM |
2733 | } |
2734 | ||
d3c2fdcf | 2735 | void btrfs_btree_balance_dirty(struct btrfs_root *root, unsigned long nr) |
35b7e476 | 2736 | { |
188de649 CM |
2737 | /* |
2738 | * looks as though older kernels can get into trouble with | |
2739 | * this code, they end up stuck in balance_dirty_pages forever | |
2740 | */ | |
d6bfde87 | 2741 | u64 num_dirty; |
771ed689 | 2742 | unsigned long thresh = 32 * 1024 * 1024; |
d6bfde87 | 2743 | |
6933c02e | 2744 | if (current->flags & PF_MEMALLOC) |
d6bfde87 CM |
2745 | return; |
2746 | ||
585ad2c3 CM |
2747 | num_dirty = root->fs_info->dirty_metadata_bytes; |
2748 | ||
d6bfde87 CM |
2749 | if (num_dirty > thresh) { |
2750 | balance_dirty_pages_ratelimited_nr( | |
d7fc640e | 2751 | root->fs_info->btree_inode->i_mapping, 1); |
d6bfde87 | 2752 | } |
188de649 | 2753 | return; |
35b7e476 | 2754 | } |
6b80053d | 2755 | |
ca7a79ad | 2756 | int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid) |
6b80053d | 2757 | { |
810191ff | 2758 | struct btrfs_root *root = BTRFS_I(buf->first_page->mapping->host)->root; |
ce9adaa5 | 2759 | int ret; |
ca7a79ad | 2760 | ret = btree_read_extent_buffer_pages(root, buf, 0, parent_transid); |
d397712b | 2761 | if (ret == 0) |
b4ce94de | 2762 | set_bit(EXTENT_BUFFER_UPTODATE, &buf->bflags); |
ce9adaa5 | 2763 | return ret; |
6b80053d | 2764 | } |
0da5468f | 2765 | |
4bef0848 CM |
2766 | int btree_lock_page_hook(struct page *page) |
2767 | { | |
2768 | struct inode *inode = page->mapping->host; | |
b9473439 | 2769 | struct btrfs_root *root = BTRFS_I(inode)->root; |
4bef0848 CM |
2770 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
2771 | struct extent_buffer *eb; | |
2772 | unsigned long len; | |
2773 | u64 bytenr = page_offset(page); | |
2774 | ||
2775 | if (page->private == EXTENT_PAGE_PRIVATE) | |
2776 | goto out; | |
2777 | ||
2778 | len = page->private >> 2; | |
2779 | eb = find_extent_buffer(io_tree, bytenr, len, GFP_NOFS); | |
2780 | if (!eb) | |
2781 | goto out; | |
2782 | ||
2783 | btrfs_tree_lock(eb); | |
4bef0848 | 2784 | btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
b9473439 CM |
2785 | |
2786 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { | |
2787 | spin_lock(&root->fs_info->delalloc_lock); | |
2788 | if (root->fs_info->dirty_metadata_bytes >= eb->len) | |
2789 | root->fs_info->dirty_metadata_bytes -= eb->len; | |
2790 | else | |
2791 | WARN_ON(1); | |
2792 | spin_unlock(&root->fs_info->delalloc_lock); | |
2793 | } | |
2794 | ||
4bef0848 CM |
2795 | btrfs_tree_unlock(eb); |
2796 | free_extent_buffer(eb); | |
2797 | out: | |
2798 | lock_page(page); | |
2799 | return 0; | |
2800 | } | |
2801 | ||
acce952b | 2802 | static void btrfs_check_super_valid(struct btrfs_fs_info *fs_info, |
2803 | int read_only) | |
2804 | { | |
2805 | if (read_only) | |
2806 | return; | |
2807 | ||
2808 | if (fs_info->fs_state & BTRFS_SUPER_FLAG_ERROR) | |
2809 | printk(KERN_WARNING "warning: mount fs with errors, " | |
2810 | "running btrfsck is recommended\n"); | |
2811 | } | |
2812 | ||
2813 | int btrfs_error_commit_super(struct btrfs_root *root) | |
2814 | { | |
2815 | int ret; | |
2816 | ||
2817 | mutex_lock(&root->fs_info->cleaner_mutex); | |
2818 | btrfs_run_delayed_iputs(root); | |
2819 | mutex_unlock(&root->fs_info->cleaner_mutex); | |
2820 | ||
2821 | down_write(&root->fs_info->cleanup_work_sem); | |
2822 | up_write(&root->fs_info->cleanup_work_sem); | |
2823 | ||
2824 | /* cleanup FS via transaction */ | |
2825 | btrfs_cleanup_transaction(root); | |
2826 | ||
2827 | ret = write_ctree_super(NULL, root, 0); | |
2828 | ||
2829 | return ret; | |
2830 | } | |
2831 | ||
2832 | static int btrfs_destroy_ordered_operations(struct btrfs_root *root) | |
2833 | { | |
2834 | struct btrfs_inode *btrfs_inode; | |
2835 | struct list_head splice; | |
2836 | ||
2837 | INIT_LIST_HEAD(&splice); | |
2838 | ||
2839 | mutex_lock(&root->fs_info->ordered_operations_mutex); | |
2840 | spin_lock(&root->fs_info->ordered_extent_lock); | |
2841 | ||
2842 | list_splice_init(&root->fs_info->ordered_operations, &splice); | |
2843 | while (!list_empty(&splice)) { | |
2844 | btrfs_inode = list_entry(splice.next, struct btrfs_inode, | |
2845 | ordered_operations); | |
2846 | ||
2847 | list_del_init(&btrfs_inode->ordered_operations); | |
2848 | ||
2849 | btrfs_invalidate_inodes(btrfs_inode->root); | |
2850 | } | |
2851 | ||
2852 | spin_unlock(&root->fs_info->ordered_extent_lock); | |
2853 | mutex_unlock(&root->fs_info->ordered_operations_mutex); | |
2854 | ||
2855 | return 0; | |
2856 | } | |
2857 | ||
2858 | static int btrfs_destroy_ordered_extents(struct btrfs_root *root) | |
2859 | { | |
2860 | struct list_head splice; | |
2861 | struct btrfs_ordered_extent *ordered; | |
2862 | struct inode *inode; | |
2863 | ||
2864 | INIT_LIST_HEAD(&splice); | |
2865 | ||
2866 | spin_lock(&root->fs_info->ordered_extent_lock); | |
2867 | ||
2868 | list_splice_init(&root->fs_info->ordered_extents, &splice); | |
2869 | while (!list_empty(&splice)) { | |
2870 | ordered = list_entry(splice.next, struct btrfs_ordered_extent, | |
2871 | root_extent_list); | |
2872 | ||
2873 | list_del_init(&ordered->root_extent_list); | |
2874 | atomic_inc(&ordered->refs); | |
2875 | ||
2876 | /* the inode may be getting freed (in sys_unlink path). */ | |
2877 | inode = igrab(ordered->inode); | |
2878 | ||
2879 | spin_unlock(&root->fs_info->ordered_extent_lock); | |
2880 | if (inode) | |
2881 | iput(inode); | |
2882 | ||
2883 | atomic_set(&ordered->refs, 1); | |
2884 | btrfs_put_ordered_extent(ordered); | |
2885 | ||
2886 | spin_lock(&root->fs_info->ordered_extent_lock); | |
2887 | } | |
2888 | ||
2889 | spin_unlock(&root->fs_info->ordered_extent_lock); | |
2890 | ||
2891 | return 0; | |
2892 | } | |
2893 | ||
2894 | static int btrfs_destroy_delayed_refs(struct btrfs_transaction *trans, | |
2895 | struct btrfs_root *root) | |
2896 | { | |
2897 | struct rb_node *node; | |
2898 | struct btrfs_delayed_ref_root *delayed_refs; | |
2899 | struct btrfs_delayed_ref_node *ref; | |
2900 | int ret = 0; | |
2901 | ||
2902 | delayed_refs = &trans->delayed_refs; | |
2903 | ||
2904 | spin_lock(&delayed_refs->lock); | |
2905 | if (delayed_refs->num_entries == 0) { | |
2906 | printk(KERN_INFO "delayed_refs has NO entry\n"); | |
2907 | return ret; | |
2908 | } | |
2909 | ||
2910 | node = rb_first(&delayed_refs->root); | |
2911 | while (node) { | |
2912 | ref = rb_entry(node, struct btrfs_delayed_ref_node, rb_node); | |
2913 | node = rb_next(node); | |
2914 | ||
2915 | ref->in_tree = 0; | |
2916 | rb_erase(&ref->rb_node, &delayed_refs->root); | |
2917 | delayed_refs->num_entries--; | |
2918 | ||
2919 | atomic_set(&ref->refs, 1); | |
2920 | if (btrfs_delayed_ref_is_head(ref)) { | |
2921 | struct btrfs_delayed_ref_head *head; | |
2922 | ||
2923 | head = btrfs_delayed_node_to_head(ref); | |
2924 | mutex_lock(&head->mutex); | |
2925 | kfree(head->extent_op); | |
2926 | delayed_refs->num_heads--; | |
2927 | if (list_empty(&head->cluster)) | |
2928 | delayed_refs->num_heads_ready--; | |
2929 | list_del_init(&head->cluster); | |
2930 | mutex_unlock(&head->mutex); | |
2931 | } | |
2932 | ||
2933 | spin_unlock(&delayed_refs->lock); | |
2934 | btrfs_put_delayed_ref(ref); | |
2935 | ||
2936 | cond_resched(); | |
2937 | spin_lock(&delayed_refs->lock); | |
2938 | } | |
2939 | ||
2940 | spin_unlock(&delayed_refs->lock); | |
2941 | ||
2942 | return ret; | |
2943 | } | |
2944 | ||
2945 | static int btrfs_destroy_pending_snapshots(struct btrfs_transaction *t) | |
2946 | { | |
2947 | struct btrfs_pending_snapshot *snapshot; | |
2948 | struct list_head splice; | |
2949 | ||
2950 | INIT_LIST_HEAD(&splice); | |
2951 | ||
2952 | list_splice_init(&t->pending_snapshots, &splice); | |
2953 | ||
2954 | while (!list_empty(&splice)) { | |
2955 | snapshot = list_entry(splice.next, | |
2956 | struct btrfs_pending_snapshot, | |
2957 | list); | |
2958 | ||
2959 | list_del_init(&snapshot->list); | |
2960 | ||
2961 | kfree(snapshot); | |
2962 | } | |
2963 | ||
2964 | return 0; | |
2965 | } | |
2966 | ||
2967 | static int btrfs_destroy_delalloc_inodes(struct btrfs_root *root) | |
2968 | { | |
2969 | struct btrfs_inode *btrfs_inode; | |
2970 | struct list_head splice; | |
2971 | ||
2972 | INIT_LIST_HEAD(&splice); | |
2973 | ||
2974 | list_splice_init(&root->fs_info->delalloc_inodes, &splice); | |
2975 | ||
2976 | spin_lock(&root->fs_info->delalloc_lock); | |
2977 | ||
2978 | while (!list_empty(&splice)) { | |
2979 | btrfs_inode = list_entry(splice.next, struct btrfs_inode, | |
2980 | delalloc_inodes); | |
2981 | ||
2982 | list_del_init(&btrfs_inode->delalloc_inodes); | |
2983 | ||
2984 | btrfs_invalidate_inodes(btrfs_inode->root); | |
2985 | } | |
2986 | ||
2987 | spin_unlock(&root->fs_info->delalloc_lock); | |
2988 | ||
2989 | return 0; | |
2990 | } | |
2991 | ||
2992 | static int btrfs_destroy_marked_extents(struct btrfs_root *root, | |
2993 | struct extent_io_tree *dirty_pages, | |
2994 | int mark) | |
2995 | { | |
2996 | int ret; | |
2997 | struct page *page; | |
2998 | struct inode *btree_inode = root->fs_info->btree_inode; | |
2999 | struct extent_buffer *eb; | |
3000 | u64 start = 0; | |
3001 | u64 end; | |
3002 | u64 offset; | |
3003 | unsigned long index; | |
3004 | ||
3005 | while (1) { | |
3006 | ret = find_first_extent_bit(dirty_pages, start, &start, &end, | |
3007 | mark); | |
3008 | if (ret) | |
3009 | break; | |
3010 | ||
3011 | clear_extent_bits(dirty_pages, start, end, mark, GFP_NOFS); | |
3012 | while (start <= end) { | |
3013 | index = start >> PAGE_CACHE_SHIFT; | |
3014 | start = (u64)(index + 1) << PAGE_CACHE_SHIFT; | |
3015 | page = find_get_page(btree_inode->i_mapping, index); | |
3016 | if (!page) | |
3017 | continue; | |
3018 | offset = page_offset(page); | |
3019 | ||
3020 | spin_lock(&dirty_pages->buffer_lock); | |
3021 | eb = radix_tree_lookup( | |
3022 | &(&BTRFS_I(page->mapping->host)->io_tree)->buffer, | |
3023 | offset >> PAGE_CACHE_SHIFT); | |
3024 | spin_unlock(&dirty_pages->buffer_lock); | |
3025 | if (eb) { | |
3026 | ret = test_and_clear_bit(EXTENT_BUFFER_DIRTY, | |
3027 | &eb->bflags); | |
3028 | atomic_set(&eb->refs, 1); | |
3029 | } | |
3030 | if (PageWriteback(page)) | |
3031 | end_page_writeback(page); | |
3032 | ||
3033 | lock_page(page); | |
3034 | if (PageDirty(page)) { | |
3035 | clear_page_dirty_for_io(page); | |
3036 | spin_lock_irq(&page->mapping->tree_lock); | |
3037 | radix_tree_tag_clear(&page->mapping->page_tree, | |
3038 | page_index(page), | |
3039 | PAGECACHE_TAG_DIRTY); | |
3040 | spin_unlock_irq(&page->mapping->tree_lock); | |
3041 | } | |
3042 | ||
3043 | page->mapping->a_ops->invalidatepage(page, 0); | |
3044 | unlock_page(page); | |
3045 | } | |
3046 | } | |
3047 | ||
3048 | return ret; | |
3049 | } | |
3050 | ||
3051 | static int btrfs_destroy_pinned_extent(struct btrfs_root *root, | |
3052 | struct extent_io_tree *pinned_extents) | |
3053 | { | |
3054 | struct extent_io_tree *unpin; | |
3055 | u64 start; | |
3056 | u64 end; | |
3057 | int ret; | |
3058 | ||
3059 | unpin = pinned_extents; | |
3060 | while (1) { | |
3061 | ret = find_first_extent_bit(unpin, 0, &start, &end, | |
3062 | EXTENT_DIRTY); | |
3063 | if (ret) | |
3064 | break; | |
3065 | ||
3066 | /* opt_discard */ | |
5378e607 LD |
3067 | if (btrfs_test_opt(root, DISCARD)) |
3068 | ret = btrfs_error_discard_extent(root, start, | |
3069 | end + 1 - start, | |
3070 | NULL); | |
acce952b | 3071 | |
3072 | clear_extent_dirty(unpin, start, end, GFP_NOFS); | |
3073 | btrfs_error_unpin_extent_range(root, start, end); | |
3074 | cond_resched(); | |
3075 | } | |
3076 | ||
3077 | return 0; | |
3078 | } | |
3079 | ||
3080 | static int btrfs_cleanup_transaction(struct btrfs_root *root) | |
3081 | { | |
3082 | struct btrfs_transaction *t; | |
3083 | LIST_HEAD(list); | |
3084 | ||
3085 | WARN_ON(1); | |
3086 | ||
3087 | mutex_lock(&root->fs_info->trans_mutex); | |
3088 | mutex_lock(&root->fs_info->transaction_kthread_mutex); | |
3089 | ||
3090 | list_splice_init(&root->fs_info->trans_list, &list); | |
3091 | while (!list_empty(&list)) { | |
3092 | t = list_entry(list.next, struct btrfs_transaction, list); | |
3093 | if (!t) | |
3094 | break; | |
3095 | ||
3096 | btrfs_destroy_ordered_operations(root); | |
3097 | ||
3098 | btrfs_destroy_ordered_extents(root); | |
3099 | ||
3100 | btrfs_destroy_delayed_refs(t, root); | |
3101 | ||
3102 | btrfs_block_rsv_release(root, | |
3103 | &root->fs_info->trans_block_rsv, | |
3104 | t->dirty_pages.dirty_bytes); | |
3105 | ||
3106 | /* FIXME: cleanup wait for commit */ | |
3107 | t->in_commit = 1; | |
3108 | t->blocked = 1; | |
3109 | if (waitqueue_active(&root->fs_info->transaction_blocked_wait)) | |
3110 | wake_up(&root->fs_info->transaction_blocked_wait); | |
3111 | ||
3112 | t->blocked = 0; | |
3113 | if (waitqueue_active(&root->fs_info->transaction_wait)) | |
3114 | wake_up(&root->fs_info->transaction_wait); | |
3115 | mutex_unlock(&root->fs_info->trans_mutex); | |
3116 | ||
3117 | mutex_lock(&root->fs_info->trans_mutex); | |
3118 | t->commit_done = 1; | |
3119 | if (waitqueue_active(&t->commit_wait)) | |
3120 | wake_up(&t->commit_wait); | |
3121 | mutex_unlock(&root->fs_info->trans_mutex); | |
3122 | ||
3123 | mutex_lock(&root->fs_info->trans_mutex); | |
3124 | ||
3125 | btrfs_destroy_pending_snapshots(t); | |
3126 | ||
3127 | btrfs_destroy_delalloc_inodes(root); | |
3128 | ||
3129 | spin_lock(&root->fs_info->new_trans_lock); | |
3130 | root->fs_info->running_transaction = NULL; | |
3131 | spin_unlock(&root->fs_info->new_trans_lock); | |
3132 | ||
3133 | btrfs_destroy_marked_extents(root, &t->dirty_pages, | |
3134 | EXTENT_DIRTY); | |
3135 | ||
3136 | btrfs_destroy_pinned_extent(root, | |
3137 | root->fs_info->pinned_extents); | |
3138 | ||
3139 | t->use_count = 0; | |
3140 | list_del_init(&t->list); | |
3141 | memset(t, 0, sizeof(*t)); | |
3142 | kmem_cache_free(btrfs_transaction_cachep, t); | |
3143 | } | |
3144 | ||
3145 | mutex_unlock(&root->fs_info->transaction_kthread_mutex); | |
3146 | mutex_unlock(&root->fs_info->trans_mutex); | |
3147 | ||
3148 | return 0; | |
3149 | } | |
3150 | ||
d1310b2e | 3151 | static struct extent_io_ops btree_extent_io_ops = { |
4bef0848 | 3152 | .write_cache_pages_lock_hook = btree_lock_page_hook, |
ce9adaa5 | 3153 | .readpage_end_io_hook = btree_readpage_end_io_hook, |
0b86a832 | 3154 | .submit_bio_hook = btree_submit_bio_hook, |
239b14b3 CM |
3155 | /* note we're sharing with inode.c for the merge bio hook */ |
3156 | .merge_bio_hook = btrfs_merge_bio_hook, | |
0da5468f | 3157 | }; |