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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; | |
0f7d52f4 CM |
216 | struct btrfs_root *root; |
217 | }; | |
218 | ||
5eda7b5e CM |
219 | int btrfs_add_dead_root(struct btrfs_root *root, struct list_head *dead_list) |
220 | { | |
221 | struct dirty_root *dirty; | |
222 | ||
223 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
224 | if (!dirty) | |
225 | return -ENOMEM; | |
5eda7b5e | 226 | dirty->root = root; |
5eda7b5e CM |
227 | list_add(&dirty->list, dead_list); |
228 | return 0; | |
229 | } | |
230 | ||
35b7e476 CM |
231 | static int add_dirty_roots(struct btrfs_trans_handle *trans, |
232 | struct radix_tree_root *radix, | |
233 | struct list_head *list) | |
0f7d52f4 CM |
234 | { |
235 | struct dirty_root *dirty; | |
236 | struct btrfs_root *gang[8]; | |
237 | struct btrfs_root *root; | |
238 | int i; | |
239 | int ret; | |
54aa1f4d | 240 | int err = 0; |
5eda7b5e | 241 | u32 refs; |
54aa1f4d | 242 | |
0f7d52f4 CM |
243 | while(1) { |
244 | ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0, | |
245 | ARRAY_SIZE(gang), | |
246 | BTRFS_ROOT_TRANS_TAG); | |
247 | if (ret == 0) | |
248 | break; | |
249 | for (i = 0; i < ret; i++) { | |
250 | root = gang[i]; | |
2619ba1f CM |
251 | radix_tree_tag_clear(radix, |
252 | (unsigned long)root->root_key.objectid, | |
253 | BTRFS_ROOT_TRANS_TAG); | |
0f7d52f4 | 254 | if (root->commit_root == root->node) { |
7eccb903 | 255 | WARN_ON(bh_blocknr(root->node) != |
0f7d52f4 CM |
256 | btrfs_root_blocknr(&root->root_item)); |
257 | brelse(root->commit_root); | |
258 | root->commit_root = NULL; | |
259 | continue; | |
260 | } | |
261 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
262 | BUG_ON(!dirty); | |
9f3a7427 CM |
263 | dirty->root = kmalloc(sizeof(*dirty->root), GFP_NOFS); |
264 | BUG_ON(!dirty->root); | |
265 | ||
266 | memset(&root->root_item.drop_progress, 0, | |
267 | sizeof(struct btrfs_disk_key)); | |
268 | root->root_item.drop_level = 0; | |
269 | ||
270 | memcpy(dirty->root, root, sizeof(*root)); | |
271 | dirty->root->node = root->commit_root; | |
0f7d52f4 | 272 | root->commit_root = NULL; |
5eda7b5e | 273 | |
0f7d52f4 CM |
274 | root->root_key.offset = root->fs_info->generation; |
275 | btrfs_set_root_blocknr(&root->root_item, | |
7eccb903 | 276 | bh_blocknr(root->node)); |
0f7d52f4 CM |
277 | err = btrfs_insert_root(trans, root->fs_info->tree_root, |
278 | &root->root_key, | |
279 | &root->root_item); | |
54aa1f4d CM |
280 | if (err) |
281 | break; | |
9f3a7427 CM |
282 | |
283 | refs = btrfs_root_refs(&dirty->root->root_item); | |
284 | btrfs_set_root_refs(&dirty->root->root_item, refs - 1); | |
5eda7b5e | 285 | err = btrfs_update_root(trans, root->fs_info->tree_root, |
9f3a7427 CM |
286 | &dirty->root->root_key, |
287 | &dirty->root->root_item); | |
5eda7b5e CM |
288 | |
289 | BUG_ON(err); | |
9f3a7427 | 290 | if (refs == 1) { |
5eda7b5e | 291 | list_add(&dirty->list, list); |
9f3a7427 CM |
292 | } else { |
293 | WARN_ON(1); | |
294 | kfree(dirty->root); | |
5eda7b5e | 295 | kfree(dirty); |
9f3a7427 | 296 | } |
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; |
9f3a7427 CM |
308 | int err; |
309 | ||
0f7d52f4 | 310 | while(!list_empty(list)) { |
facda1e7 | 311 | mutex_lock(&tree_root->fs_info->fs_mutex); |
0f7d52f4 CM |
312 | dirty = list_entry(list->next, struct dirty_root, list); |
313 | list_del_init(&dirty->list); | |
5eda7b5e | 314 | |
9f3a7427 CM |
315 | while(1) { |
316 | trans = btrfs_start_transaction(tree_root, 1); | |
317 | ret = btrfs_drop_snapshot(trans, dirty->root); | |
318 | if (ret != -EAGAIN) { | |
319 | break; | |
320 | } | |
321 | err = btrfs_update_root(trans, | |
322 | tree_root, | |
323 | &dirty->root->root_key, | |
324 | &dirty->root->root_item); | |
325 | if (err) | |
326 | ret = err; | |
327 | ret = btrfs_end_transaction(trans, tree_root); | |
328 | BUG_ON(ret); | |
329 | } | |
0f7d52f4 | 330 | BUG_ON(ret); |
9f3a7427 | 331 | ret = btrfs_del_root(trans, tree_root, &dirty->root->root_key); |
54aa1f4d CM |
332 | if (ret) |
333 | break; | |
0f7d52f4 CM |
334 | ret = btrfs_end_transaction(trans, tree_root); |
335 | BUG_ON(ret); | |
5eda7b5e | 336 | |
9f3a7427 | 337 | kfree(dirty->root); |
0f7d52f4 | 338 | kfree(dirty); |
facda1e7 | 339 | mutex_unlock(&tree_root->fs_info->fs_mutex); |
8c2383c3 | 340 | btrfs_btree_balance_dirty(tree_root); |
0f7d52f4 | 341 | } |
54aa1f4d | 342 | return ret; |
0f7d52f4 CM |
343 | } |
344 | ||
79154b1b CM |
345 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
346 | struct btrfs_root *root) | |
347 | { | |
348 | int ret = 0; | |
79154b1b | 349 | struct btrfs_transaction *cur_trans; |
8fd17795 | 350 | struct btrfs_transaction *prev_trans = NULL; |
0f7d52f4 | 351 | struct list_head dirty_fs_roots; |
ccd467d6 | 352 | struct radix_tree_root pinned_copy; |
79154b1b CM |
353 | DEFINE_WAIT(wait); |
354 | ||
ccd467d6 | 355 | init_bit_radix(&pinned_copy); |
0f7d52f4 | 356 | INIT_LIST_HEAD(&dirty_fs_roots); |
d6e4a428 | 357 | |
79154b1b CM |
358 | mutex_lock(&root->fs_info->trans_mutex); |
359 | if (trans->transaction->in_commit) { | |
360 | cur_trans = trans->transaction; | |
361 | trans->transaction->use_count++; | |
ccd467d6 | 362 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b | 363 | btrfs_end_transaction(trans, root); |
ccd467d6 CM |
364 | |
365 | mutex_unlock(&root->fs_info->fs_mutex); | |
79154b1b CM |
366 | ret = wait_for_commit(root, cur_trans); |
367 | BUG_ON(ret); | |
368 | put_transaction(cur_trans); | |
ccd467d6 | 369 | mutex_lock(&root->fs_info->fs_mutex); |
79154b1b CM |
370 | return 0; |
371 | } | |
2c90e5d6 | 372 | trans->transaction->in_commit = 1; |
ccd467d6 CM |
373 | cur_trans = trans->transaction; |
374 | if (cur_trans->list.prev != &root->fs_info->trans_list) { | |
375 | prev_trans = list_entry(cur_trans->list.prev, | |
376 | struct btrfs_transaction, list); | |
377 | if (!prev_trans->commit_done) { | |
378 | prev_trans->use_count++; | |
379 | mutex_unlock(&root->fs_info->fs_mutex); | |
380 | mutex_unlock(&root->fs_info->trans_mutex); | |
381 | ||
382 | wait_for_commit(root, prev_trans); | |
383 | put_transaction(prev_trans); | |
384 | ||
385 | mutex_lock(&root->fs_info->fs_mutex); | |
386 | mutex_lock(&root->fs_info->trans_mutex); | |
387 | } | |
388 | } | |
79154b1b | 389 | while (trans->transaction->num_writers > 1) { |
2c90e5d6 | 390 | WARN_ON(cur_trans != trans->transaction); |
79154b1b CM |
391 | prepare_to_wait(&trans->transaction->writer_wait, &wait, |
392 | TASK_UNINTERRUPTIBLE); | |
393 | if (trans->transaction->num_writers <= 1) | |
394 | break; | |
ccd467d6 | 395 | mutex_unlock(&root->fs_info->fs_mutex); |
79154b1b CM |
396 | mutex_unlock(&root->fs_info->trans_mutex); |
397 | schedule(); | |
ccd467d6 | 398 | mutex_lock(&root->fs_info->fs_mutex); |
79154b1b | 399 | mutex_lock(&root->fs_info->trans_mutex); |
2c90e5d6 | 400 | finish_wait(&trans->transaction->writer_wait, &wait); |
79154b1b CM |
401 | } |
402 | finish_wait(&trans->transaction->writer_wait, &wait); | |
2c90e5d6 | 403 | WARN_ON(cur_trans != trans->transaction); |
54aa1f4d CM |
404 | ret = add_dirty_roots(trans, &root->fs_info->fs_roots_radix, |
405 | &dirty_fs_roots); | |
406 | BUG_ON(ret); | |
407 | ||
79154b1b CM |
408 | ret = btrfs_commit_tree_roots(trans, root); |
409 | BUG_ON(ret); | |
54aa1f4d | 410 | |
78fae27e CM |
411 | cur_trans = root->fs_info->running_transaction; |
412 | root->fs_info->running_transaction = NULL; | |
4b52dff6 CM |
413 | btrfs_set_super_generation(&root->fs_info->super_copy, |
414 | cur_trans->transid); | |
415 | btrfs_set_super_root(&root->fs_info->super_copy, | |
416 | bh_blocknr(root->fs_info->tree_root->node)); | |
417 | memcpy(root->fs_info->disk_super, &root->fs_info->super_copy, | |
418 | sizeof(root->fs_info->super_copy)); | |
ccd467d6 CM |
419 | |
420 | btrfs_copy_pinned(root, &pinned_copy); | |
421 | ||
78fae27e | 422 | mutex_unlock(&root->fs_info->trans_mutex); |
8fd17795 | 423 | mutex_unlock(&root->fs_info->fs_mutex); |
79154b1b CM |
424 | ret = btrfs_write_and_wait_transaction(trans, root); |
425 | BUG_ON(ret); | |
79154b1b | 426 | write_ctree_super(trans, root); |
8fd17795 | 427 | mutex_lock(&root->fs_info->fs_mutex); |
ccd467d6 | 428 | btrfs_finish_extent_commit(trans, root, &pinned_copy); |
78fae27e | 429 | mutex_lock(&root->fs_info->trans_mutex); |
2c90e5d6 CM |
430 | cur_trans->commit_done = 1; |
431 | wake_up(&cur_trans->commit_wait); | |
78fae27e | 432 | put_transaction(cur_trans); |
79154b1b | 433 | put_transaction(cur_trans); |
facda1e7 CM |
434 | if (root->fs_info->closing) |
435 | list_splice_init(&root->fs_info->dead_roots, &dirty_fs_roots); | |
436 | else | |
437 | list_splice_init(&dirty_fs_roots, &root->fs_info->dead_roots); | |
78fae27e | 438 | mutex_unlock(&root->fs_info->trans_mutex); |
2c90e5d6 | 439 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b | 440 | |
facda1e7 CM |
441 | if (root->fs_info->closing) { |
442 | mutex_unlock(&root->fs_info->fs_mutex); | |
443 | drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots); | |
444 | mutex_lock(&root->fs_info->fs_mutex); | |
445 | } | |
79154b1b CM |
446 | return ret; |
447 | } | |
448 | ||
08607c1b CM |
449 | void btrfs_transaction_cleaner(struct work_struct *work) |
450 | { | |
451 | struct btrfs_fs_info *fs_info = container_of(work, | |
452 | struct btrfs_fs_info, | |
453 | trans_work.work); | |
454 | ||
455 | struct btrfs_root *root = fs_info->tree_root; | |
456 | struct btrfs_transaction *cur; | |
457 | struct btrfs_trans_handle *trans; | |
facda1e7 | 458 | struct list_head dirty_roots; |
08607c1b CM |
459 | unsigned long now; |
460 | unsigned long delay = HZ * 30; | |
461 | int ret; | |
462 | ||
facda1e7 | 463 | INIT_LIST_HEAD(&dirty_roots); |
08607c1b CM |
464 | mutex_lock(&root->fs_info->fs_mutex); |
465 | mutex_lock(&root->fs_info->trans_mutex); | |
466 | cur = root->fs_info->running_transaction; | |
467 | if (!cur) { | |
468 | mutex_unlock(&root->fs_info->trans_mutex); | |
469 | goto out; | |
470 | } | |
471 | now = get_seconds(); | |
472 | if (now < cur->start_time || now - cur->start_time < 30) { | |
473 | mutex_unlock(&root->fs_info->trans_mutex); | |
474 | delay = HZ * 5; | |
475 | goto out; | |
476 | } | |
477 | mutex_unlock(&root->fs_info->trans_mutex); | |
08607c1b CM |
478 | trans = btrfs_start_transaction(root, 1); |
479 | ret = btrfs_commit_transaction(trans, root); | |
480 | out: | |
481 | mutex_unlock(&root->fs_info->fs_mutex); | |
ad693af6 CM |
482 | |
483 | mutex_lock(&root->fs_info->trans_mutex); | |
484 | list_splice_init(&root->fs_info->dead_roots, &dirty_roots); | |
485 | mutex_unlock(&root->fs_info->trans_mutex); | |
486 | ||
487 | if (!list_empty(&dirty_roots)) { | |
488 | drop_dirty_roots(root, &dirty_roots); | |
489 | } | |
08607c1b CM |
490 | btrfs_transaction_queue_work(root, delay); |
491 | } | |
492 | ||
493 | void btrfs_transaction_queue_work(struct btrfs_root *root, int delay) | |
494 | { | |
495 | queue_delayed_work(trans_wq, &root->fs_info->trans_work, delay); | |
496 | } | |
497 | ||
498 | void btrfs_transaction_flush_work(struct btrfs_root *root) | |
499 | { | |
500 | cancel_rearming_delayed_workqueue(trans_wq, &root->fs_info->trans_work); | |
501 | flush_workqueue(trans_wq); | |
502 | } | |
503 | ||
504 | void __init btrfs_init_transaction_sys(void) | |
505 | { | |
506 | trans_wq = create_workqueue("btrfs"); | |
507 | } | |
508 | ||
509 | void __exit btrfs_exit_transaction_sys(void) | |
510 | { | |
511 | destroy_workqueue(trans_wq); | |
512 | } | |
513 |