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 | ||
79154b1b | 19 | #include <linux/fs.h> |
34088780 | 20 | #include <linux/sched.h> |
79154b1b CM |
21 | #include "ctree.h" |
22 | #include "disk-io.h" | |
23 | #include "transaction.h" | |
24 | ||
78fae27e | 25 | static int total_trans = 0; |
2c90e5d6 CM |
26 | extern struct kmem_cache *btrfs_trans_handle_cachep; |
27 | extern struct kmem_cache *btrfs_transaction_cachep; | |
28 | ||
08607c1b CM |
29 | static struct workqueue_struct *trans_wq; |
30 | ||
0f7d52f4 CM |
31 | #define BTRFS_ROOT_TRANS_TAG 0 |
32 | ||
79154b1b CM |
33 | static void put_transaction(struct btrfs_transaction *transaction) |
34 | { | |
2c90e5d6 | 35 | WARN_ON(transaction->use_count == 0); |
79154b1b | 36 | transaction->use_count--; |
78fae27e CM |
37 | if (transaction->use_count == 0) { |
38 | WARN_ON(total_trans == 0); | |
39 | total_trans--; | |
8fd17795 | 40 | list_del_init(&transaction->list); |
2c90e5d6 CM |
41 | memset(transaction, 0, sizeof(*transaction)); |
42 | kmem_cache_free(btrfs_transaction_cachep, transaction); | |
78fae27e | 43 | } |
79154b1b CM |
44 | } |
45 | ||
46 | static int join_transaction(struct btrfs_root *root) | |
47 | { | |
48 | struct btrfs_transaction *cur_trans; | |
49 | cur_trans = root->fs_info->running_transaction; | |
50 | if (!cur_trans) { | |
2c90e5d6 CM |
51 | cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, |
52 | GFP_NOFS); | |
78fae27e | 53 | total_trans++; |
79154b1b | 54 | BUG_ON(!cur_trans); |
0f7d52f4 | 55 | root->fs_info->generation++; |
79154b1b CM |
56 | root->fs_info->running_transaction = cur_trans; |
57 | cur_trans->num_writers = 0; | |
0f7d52f4 | 58 | cur_trans->transid = root->fs_info->generation; |
79154b1b CM |
59 | init_waitqueue_head(&cur_trans->writer_wait); |
60 | init_waitqueue_head(&cur_trans->commit_wait); | |
61 | cur_trans->in_commit = 0; | |
d5719762 | 62 | cur_trans->use_count = 1; |
79154b1b | 63 | cur_trans->commit_done = 0; |
08607c1b | 64 | cur_trans->start_time = get_seconds(); |
8fd17795 | 65 | list_add_tail(&cur_trans->list, &root->fs_info->trans_list); |
7c4452b9 | 66 | init_bit_radix(&cur_trans->dirty_pages); |
79154b1b CM |
67 | } |
68 | cur_trans->num_writers++; | |
69 | return 0; | |
70 | } | |
71 | ||
72 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, | |
73 | int num_blocks) | |
74 | { | |
2c90e5d6 CM |
75 | struct btrfs_trans_handle *h = |
76 | kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); | |
79154b1b | 77 | int ret; |
0f7d52f4 | 78 | u64 running_trans_id; |
79154b1b CM |
79 | |
80 | mutex_lock(&root->fs_info->trans_mutex); | |
81 | ret = join_transaction(root); | |
82 | BUG_ON(ret); | |
0f7d52f4 CM |
83 | running_trans_id = root->fs_info->running_transaction->transid; |
84 | ||
85 | if (root != root->fs_info->tree_root && root->last_trans < | |
86 | running_trans_id) { | |
ccd467d6 CM |
87 | WARN_ON(root == root->fs_info->extent_root); |
88 | WARN_ON(root->ref_cows != 1); | |
5eda7b5e CM |
89 | if (root->root_item.refs != 0) { |
90 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, | |
91 | (unsigned long)root->root_key.objectid, | |
92 | BTRFS_ROOT_TRANS_TAG); | |
93 | root->commit_root = root->node; | |
94 | get_bh(root->node); | |
95 | } else { | |
96 | WARN_ON(1); | |
97 | } | |
0f7d52f4 CM |
98 | } |
99 | root->last_trans = running_trans_id; | |
100 | h->transid = running_trans_id; | |
79154b1b CM |
101 | h->transaction = root->fs_info->running_transaction; |
102 | h->blocks_reserved = num_blocks; | |
103 | h->blocks_used = 0; | |
31f3c99b | 104 | h->block_group = NULL; |
79154b1b CM |
105 | root->fs_info->running_transaction->use_count++; |
106 | mutex_unlock(&root->fs_info->trans_mutex); | |
107 | return h; | |
108 | } | |
109 | ||
110 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, | |
111 | struct btrfs_root *root) | |
112 | { | |
113 | struct btrfs_transaction *cur_trans; | |
d6e4a428 | 114 | |
79154b1b CM |
115 | mutex_lock(&root->fs_info->trans_mutex); |
116 | cur_trans = root->fs_info->running_transaction; | |
ccd467d6 | 117 | WARN_ON(cur_trans != trans->transaction); |
d5719762 | 118 | WARN_ON(cur_trans->num_writers < 1); |
ccd467d6 | 119 | cur_trans->num_writers--; |
79154b1b CM |
120 | if (waitqueue_active(&cur_trans->writer_wait)) |
121 | wake_up(&cur_trans->writer_wait); | |
79154b1b CM |
122 | put_transaction(cur_trans); |
123 | mutex_unlock(&root->fs_info->trans_mutex); | |
d6025579 | 124 | memset(trans, 0, sizeof(*trans)); |
2c90e5d6 | 125 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b CM |
126 | return 0; |
127 | } | |
128 | ||
129 | ||
130 | int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, | |
131 | struct btrfs_root *root) | |
132 | { | |
7c4452b9 CM |
133 | unsigned long gang[16]; |
134 | int ret; | |
135 | int i; | |
136 | int err; | |
137 | int werr = 0; | |
138 | struct page *page; | |
139 | struct radix_tree_root *dirty_pages; | |
140 | struct inode *btree_inode = root->fs_info->btree_inode; | |
141 | ||
142 | if (!trans || !trans->transaction) { | |
143 | return filemap_write_and_wait(btree_inode->i_mapping); | |
144 | } | |
145 | dirty_pages = &trans->transaction->dirty_pages; | |
146 | while(1) { | |
e37c9e69 CM |
147 | ret = find_first_radix_bit(dirty_pages, gang, |
148 | 0, ARRAY_SIZE(gang)); | |
7c4452b9 CM |
149 | if (!ret) |
150 | break; | |
151 | for (i = 0; i < ret; i++) { | |
152 | /* FIXME EIO */ | |
153 | clear_radix_bit(dirty_pages, gang[i]); | |
154 | page = find_lock_page(btree_inode->i_mapping, | |
155 | gang[i]); | |
156 | if (!page) | |
157 | continue; | |
158 | err = write_one_page(page, 0); | |
159 | if (err) | |
160 | werr = err; | |
161 | page_cache_release(page); | |
162 | } | |
163 | } | |
164 | err = filemap_fdatawait(btree_inode->i_mapping); | |
165 | if (err) | |
166 | werr = err; | |
167 | return werr; | |
79154b1b CM |
168 | } |
169 | ||
170 | int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans, | |
171 | struct btrfs_root *root) | |
172 | { | |
173 | int ret; | |
174 | u64 old_extent_block; | |
175 | struct btrfs_fs_info *fs_info = root->fs_info; | |
176 | struct btrfs_root *tree_root = fs_info->tree_root; | |
177 | struct btrfs_root *extent_root = fs_info->extent_root; | |
79154b1b | 178 | |
9078a3e1 | 179 | btrfs_write_dirty_block_groups(trans, extent_root); |
79154b1b CM |
180 | while(1) { |
181 | old_extent_block = btrfs_root_blocknr(&extent_root->root_item); | |
7eccb903 | 182 | if (old_extent_block == bh_blocknr(extent_root->node)) |
79154b1b CM |
183 | break; |
184 | btrfs_set_root_blocknr(&extent_root->root_item, | |
7eccb903 | 185 | bh_blocknr(extent_root->node)); |
79154b1b CM |
186 | ret = btrfs_update_root(trans, tree_root, |
187 | &extent_root->root_key, | |
188 | &extent_root->root_item); | |
189 | BUG_ON(ret); | |
9078a3e1 | 190 | btrfs_write_dirty_block_groups(trans, extent_root); |
79154b1b CM |
191 | } |
192 | return 0; | |
193 | } | |
194 | ||
195 | static int wait_for_commit(struct btrfs_root *root, | |
196 | struct btrfs_transaction *commit) | |
197 | { | |
198 | DEFINE_WAIT(wait); | |
ccd467d6 | 199 | mutex_lock(&root->fs_info->trans_mutex); |
79154b1b CM |
200 | while(!commit->commit_done) { |
201 | prepare_to_wait(&commit->commit_wait, &wait, | |
202 | TASK_UNINTERRUPTIBLE); | |
203 | if (commit->commit_done) | |
204 | break; | |
205 | mutex_unlock(&root->fs_info->trans_mutex); | |
206 | schedule(); | |
207 | mutex_lock(&root->fs_info->trans_mutex); | |
208 | } | |
ccd467d6 | 209 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b CM |
210 | finish_wait(&commit->commit_wait, &wait); |
211 | return 0; | |
212 | } | |
213 | ||
0f7d52f4 CM |
214 | struct dirty_root { |
215 | struct list_head list; | |
216 | struct btrfs_key snap_key; | |
217 | struct buffer_head *commit_root; | |
218 | struct btrfs_root *root; | |
5eda7b5e | 219 | int free_on_drop; |
0f7d52f4 CM |
220 | }; |
221 | ||
5eda7b5e CM |
222 | int btrfs_add_dead_root(struct btrfs_root *root, struct list_head *dead_list) |
223 | { | |
224 | struct dirty_root *dirty; | |
225 | ||
226 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
227 | if (!dirty) | |
228 | return -ENOMEM; | |
229 | memcpy(&dirty->snap_key, &root->root_key, sizeof(root->root_key)); | |
230 | dirty->commit_root = root->node; | |
231 | dirty->root = root; | |
232 | dirty->free_on_drop = 1; | |
233 | list_add(&dirty->list, dead_list); | |
234 | return 0; | |
235 | } | |
236 | ||
35b7e476 CM |
237 | static int add_dirty_roots(struct btrfs_trans_handle *trans, |
238 | struct radix_tree_root *radix, | |
239 | struct list_head *list) | |
0f7d52f4 CM |
240 | { |
241 | struct dirty_root *dirty; | |
242 | struct btrfs_root *gang[8]; | |
243 | struct btrfs_root *root; | |
5eda7b5e | 244 | struct btrfs_root_item tmp_item; |
0f7d52f4 CM |
245 | int i; |
246 | int ret; | |
54aa1f4d | 247 | int err = 0; |
5eda7b5e | 248 | u32 refs; |
54aa1f4d | 249 | |
0f7d52f4 CM |
250 | while(1) { |
251 | ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0, | |
252 | ARRAY_SIZE(gang), | |
253 | BTRFS_ROOT_TRANS_TAG); | |
254 | if (ret == 0) | |
255 | break; | |
256 | for (i = 0; i < ret; i++) { | |
257 | root = gang[i]; | |
2619ba1f CM |
258 | radix_tree_tag_clear(radix, |
259 | (unsigned long)root->root_key.objectid, | |
260 | BTRFS_ROOT_TRANS_TAG); | |
0f7d52f4 | 261 | if (root->commit_root == root->node) { |
7eccb903 | 262 | WARN_ON(bh_blocknr(root->node) != |
0f7d52f4 CM |
263 | btrfs_root_blocknr(&root->root_item)); |
264 | brelse(root->commit_root); | |
265 | root->commit_root = NULL; | |
266 | continue; | |
267 | } | |
268 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
269 | BUG_ON(!dirty); | |
270 | memcpy(&dirty->snap_key, &root->root_key, | |
271 | sizeof(root->root_key)); | |
272 | dirty->commit_root = root->commit_root; | |
273 | root->commit_root = NULL; | |
274 | dirty->root = root; | |
5eda7b5e CM |
275 | dirty->free_on_drop = 0; |
276 | memcpy(&tmp_item, &root->root_item, sizeof(tmp_item)); | |
277 | ||
0f7d52f4 CM |
278 | root->root_key.offset = root->fs_info->generation; |
279 | btrfs_set_root_blocknr(&root->root_item, | |
7eccb903 | 280 | bh_blocknr(root->node)); |
0f7d52f4 CM |
281 | err = btrfs_insert_root(trans, root->fs_info->tree_root, |
282 | &root->root_key, | |
283 | &root->root_item); | |
54aa1f4d CM |
284 | if (err) |
285 | break; | |
5eda7b5e CM |
286 | refs = btrfs_root_refs(&tmp_item); |
287 | btrfs_set_root_refs(&tmp_item, refs - 1); | |
288 | err = btrfs_update_root(trans, root->fs_info->tree_root, | |
289 | &dirty->snap_key, | |
290 | &tmp_item); | |
291 | ||
292 | BUG_ON(err); | |
293 | if (refs == 1) | |
294 | list_add(&dirty->list, list); | |
295 | else | |
296 | kfree(dirty); | |
0f7d52f4 CM |
297 | } |
298 | } | |
54aa1f4d | 299 | return err; |
0f7d52f4 CM |
300 | } |
301 | ||
35b7e476 CM |
302 | static int drop_dirty_roots(struct btrfs_root *tree_root, |
303 | struct list_head *list) | |
0f7d52f4 CM |
304 | { |
305 | struct dirty_root *dirty; | |
306 | struct btrfs_trans_handle *trans; | |
54aa1f4d | 307 | int ret = 0; |
0f7d52f4 | 308 | while(!list_empty(list)) { |
facda1e7 | 309 | mutex_lock(&tree_root->fs_info->fs_mutex); |
0f7d52f4 CM |
310 | dirty = list_entry(list->next, struct dirty_root, list); |
311 | list_del_init(&dirty->list); | |
5eda7b5e | 312 | |
0f7d52f4 | 313 | trans = btrfs_start_transaction(tree_root, 1); |
0f7d52f4 CM |
314 | ret = btrfs_drop_snapshot(trans, dirty->root, |
315 | dirty->commit_root); | |
316 | BUG_ON(ret); | |
0f7d52f4 | 317 | ret = btrfs_del_root(trans, tree_root, &dirty->snap_key); |
54aa1f4d CM |
318 | if (ret) |
319 | break; | |
0f7d52f4 CM |
320 | ret = btrfs_end_transaction(trans, tree_root); |
321 | BUG_ON(ret); | |
5eda7b5e CM |
322 | |
323 | if (dirty->free_on_drop) | |
324 | kfree(dirty->root); | |
0f7d52f4 | 325 | kfree(dirty); |
facda1e7 | 326 | mutex_unlock(&tree_root->fs_info->fs_mutex); |
8c2383c3 | 327 | btrfs_btree_balance_dirty(tree_root); |
0f7d52f4 | 328 | } |
54aa1f4d | 329 | return ret; |
0f7d52f4 CM |
330 | } |
331 | ||
79154b1b CM |
332 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
333 | struct btrfs_root *root) | |
334 | { | |
335 | int ret = 0; | |
79154b1b | 336 | struct btrfs_transaction *cur_trans; |
8fd17795 | 337 | struct btrfs_transaction *prev_trans = NULL; |
0f7d52f4 | 338 | struct list_head dirty_fs_roots; |
ccd467d6 | 339 | struct radix_tree_root pinned_copy; |
79154b1b CM |
340 | DEFINE_WAIT(wait); |
341 | ||
ccd467d6 | 342 | init_bit_radix(&pinned_copy); |
0f7d52f4 | 343 | INIT_LIST_HEAD(&dirty_fs_roots); |
d6e4a428 | 344 | |
79154b1b CM |
345 | mutex_lock(&root->fs_info->trans_mutex); |
346 | if (trans->transaction->in_commit) { | |
347 | cur_trans = trans->transaction; | |
348 | trans->transaction->use_count++; | |
ccd467d6 | 349 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b | 350 | btrfs_end_transaction(trans, root); |
ccd467d6 CM |
351 | |
352 | mutex_unlock(&root->fs_info->fs_mutex); | |
79154b1b CM |
353 | ret = wait_for_commit(root, cur_trans); |
354 | BUG_ON(ret); | |
355 | put_transaction(cur_trans); | |
ccd467d6 | 356 | mutex_lock(&root->fs_info->fs_mutex); |
79154b1b CM |
357 | return 0; |
358 | } | |
2c90e5d6 | 359 | trans->transaction->in_commit = 1; |
ccd467d6 CM |
360 | cur_trans = trans->transaction; |
361 | if (cur_trans->list.prev != &root->fs_info->trans_list) { | |
362 | prev_trans = list_entry(cur_trans->list.prev, | |
363 | struct btrfs_transaction, list); | |
364 | if (!prev_trans->commit_done) { | |
365 | prev_trans->use_count++; | |
366 | mutex_unlock(&root->fs_info->fs_mutex); | |
367 | mutex_unlock(&root->fs_info->trans_mutex); | |
368 | ||
369 | wait_for_commit(root, prev_trans); | |
370 | put_transaction(prev_trans); | |
371 | ||
372 | mutex_lock(&root->fs_info->fs_mutex); | |
373 | mutex_lock(&root->fs_info->trans_mutex); | |
374 | } | |
375 | } | |
79154b1b | 376 | while (trans->transaction->num_writers > 1) { |
2c90e5d6 | 377 | WARN_ON(cur_trans != trans->transaction); |
79154b1b CM |
378 | prepare_to_wait(&trans->transaction->writer_wait, &wait, |
379 | TASK_UNINTERRUPTIBLE); | |
380 | if (trans->transaction->num_writers <= 1) | |
381 | break; | |
ccd467d6 | 382 | mutex_unlock(&root->fs_info->fs_mutex); |
79154b1b CM |
383 | mutex_unlock(&root->fs_info->trans_mutex); |
384 | schedule(); | |
ccd467d6 | 385 | mutex_lock(&root->fs_info->fs_mutex); |
79154b1b | 386 | mutex_lock(&root->fs_info->trans_mutex); |
2c90e5d6 | 387 | finish_wait(&trans->transaction->writer_wait, &wait); |
79154b1b CM |
388 | } |
389 | finish_wait(&trans->transaction->writer_wait, &wait); | |
2c90e5d6 | 390 | WARN_ON(cur_trans != trans->transaction); |
54aa1f4d CM |
391 | ret = add_dirty_roots(trans, &root->fs_info->fs_roots_radix, |
392 | &dirty_fs_roots); | |
393 | BUG_ON(ret); | |
394 | ||
79154b1b CM |
395 | ret = btrfs_commit_tree_roots(trans, root); |
396 | BUG_ON(ret); | |
54aa1f4d | 397 | |
78fae27e CM |
398 | cur_trans = root->fs_info->running_transaction; |
399 | root->fs_info->running_transaction = NULL; | |
4b52dff6 CM |
400 | btrfs_set_super_generation(&root->fs_info->super_copy, |
401 | cur_trans->transid); | |
402 | btrfs_set_super_root(&root->fs_info->super_copy, | |
403 | bh_blocknr(root->fs_info->tree_root->node)); | |
404 | memcpy(root->fs_info->disk_super, &root->fs_info->super_copy, | |
405 | sizeof(root->fs_info->super_copy)); | |
ccd467d6 CM |
406 | |
407 | btrfs_copy_pinned(root, &pinned_copy); | |
408 | ||
78fae27e | 409 | mutex_unlock(&root->fs_info->trans_mutex); |
8fd17795 | 410 | mutex_unlock(&root->fs_info->fs_mutex); |
79154b1b CM |
411 | ret = btrfs_write_and_wait_transaction(trans, root); |
412 | BUG_ON(ret); | |
79154b1b | 413 | write_ctree_super(trans, root); |
8fd17795 | 414 | mutex_lock(&root->fs_info->fs_mutex); |
ccd467d6 | 415 | btrfs_finish_extent_commit(trans, root, &pinned_copy); |
78fae27e | 416 | mutex_lock(&root->fs_info->trans_mutex); |
2c90e5d6 CM |
417 | cur_trans->commit_done = 1; |
418 | wake_up(&cur_trans->commit_wait); | |
78fae27e | 419 | put_transaction(cur_trans); |
79154b1b | 420 | put_transaction(cur_trans); |
facda1e7 CM |
421 | if (root->fs_info->closing) |
422 | list_splice_init(&root->fs_info->dead_roots, &dirty_fs_roots); | |
423 | else | |
424 | list_splice_init(&dirty_fs_roots, &root->fs_info->dead_roots); | |
78fae27e | 425 | mutex_unlock(&root->fs_info->trans_mutex); |
2c90e5d6 | 426 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b | 427 | |
facda1e7 CM |
428 | if (root->fs_info->closing) { |
429 | mutex_unlock(&root->fs_info->fs_mutex); | |
430 | drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots); | |
431 | mutex_lock(&root->fs_info->fs_mutex); | |
432 | } | |
79154b1b CM |
433 | return ret; |
434 | } | |
435 | ||
08607c1b CM |
436 | void btrfs_transaction_cleaner(struct work_struct *work) |
437 | { | |
438 | struct btrfs_fs_info *fs_info = container_of(work, | |
439 | struct btrfs_fs_info, | |
440 | trans_work.work); | |
441 | ||
442 | struct btrfs_root *root = fs_info->tree_root; | |
443 | struct btrfs_transaction *cur; | |
444 | struct btrfs_trans_handle *trans; | |
facda1e7 | 445 | struct list_head dirty_roots; |
08607c1b CM |
446 | unsigned long now; |
447 | unsigned long delay = HZ * 30; | |
448 | int ret; | |
449 | ||
facda1e7 | 450 | INIT_LIST_HEAD(&dirty_roots); |
08607c1b CM |
451 | mutex_lock(&root->fs_info->fs_mutex); |
452 | mutex_lock(&root->fs_info->trans_mutex); | |
453 | cur = root->fs_info->running_transaction; | |
454 | if (!cur) { | |
455 | mutex_unlock(&root->fs_info->trans_mutex); | |
456 | goto out; | |
457 | } | |
458 | now = get_seconds(); | |
459 | if (now < cur->start_time || now - cur->start_time < 30) { | |
460 | mutex_unlock(&root->fs_info->trans_mutex); | |
461 | delay = HZ * 5; | |
462 | goto out; | |
463 | } | |
464 | mutex_unlock(&root->fs_info->trans_mutex); | |
08607c1b CM |
465 | trans = btrfs_start_transaction(root, 1); |
466 | ret = btrfs_commit_transaction(trans, root); | |
467 | out: | |
468 | mutex_unlock(&root->fs_info->fs_mutex); | |
ad693af6 CM |
469 | |
470 | mutex_lock(&root->fs_info->trans_mutex); | |
471 | list_splice_init(&root->fs_info->dead_roots, &dirty_roots); | |
472 | mutex_unlock(&root->fs_info->trans_mutex); | |
473 | ||
474 | if (!list_empty(&dirty_roots)) { | |
475 | drop_dirty_roots(root, &dirty_roots); | |
476 | } | |
08607c1b CM |
477 | btrfs_transaction_queue_work(root, delay); |
478 | } | |
479 | ||
480 | void btrfs_transaction_queue_work(struct btrfs_root *root, int delay) | |
481 | { | |
482 | queue_delayed_work(trans_wq, &root->fs_info->trans_work, delay); | |
483 | } | |
484 | ||
485 | void btrfs_transaction_flush_work(struct btrfs_root *root) | |
486 | { | |
487 | cancel_rearming_delayed_workqueue(trans_wq, &root->fs_info->trans_work); | |
488 | flush_workqueue(trans_wq); | |
489 | } | |
490 | ||
491 | void __init btrfs_init_transaction_sys(void) | |
492 | { | |
493 | trans_wq = create_workqueue("btrfs"); | |
494 | } | |
495 | ||
496 | void __exit btrfs_exit_transaction_sys(void) | |
497 | { | |
498 | destroy_workqueue(trans_wq); | |
499 | } | |
500 |