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 | 31 | #define BTRFS_ROOT_TRANS_TAG 0 |
6702ed49 | 32 | #define BTRFS_ROOT_DEFRAG_TAG 1 |
0f7d52f4 | 33 | |
79154b1b CM |
34 | static void put_transaction(struct btrfs_transaction *transaction) |
35 | { | |
2c90e5d6 | 36 | WARN_ON(transaction->use_count == 0); |
79154b1b | 37 | transaction->use_count--; |
78fae27e CM |
38 | if (transaction->use_count == 0) { |
39 | WARN_ON(total_trans == 0); | |
40 | total_trans--; | |
8fd17795 | 41 | list_del_init(&transaction->list); |
2c90e5d6 CM |
42 | memset(transaction, 0, sizeof(*transaction)); |
43 | kmem_cache_free(btrfs_transaction_cachep, transaction); | |
78fae27e | 44 | } |
79154b1b CM |
45 | } |
46 | ||
47 | static int join_transaction(struct btrfs_root *root) | |
48 | { | |
49 | struct btrfs_transaction *cur_trans; | |
50 | cur_trans = root->fs_info->running_transaction; | |
51 | if (!cur_trans) { | |
2c90e5d6 CM |
52 | cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, |
53 | GFP_NOFS); | |
78fae27e | 54 | total_trans++; |
79154b1b | 55 | BUG_ON(!cur_trans); |
0f7d52f4 | 56 | root->fs_info->generation++; |
79154b1b | 57 | root->fs_info->running_transaction = cur_trans; |
15ee9bc7 JB |
58 | cur_trans->num_writers = 1; |
59 | cur_trans->num_joined = 0; | |
0f7d52f4 | 60 | cur_trans->transid = root->fs_info->generation; |
79154b1b CM |
61 | init_waitqueue_head(&cur_trans->writer_wait); |
62 | init_waitqueue_head(&cur_trans->commit_wait); | |
63 | cur_trans->in_commit = 0; | |
d5719762 | 64 | cur_trans->use_count = 1; |
79154b1b | 65 | cur_trans->commit_done = 0; |
08607c1b | 66 | cur_trans->start_time = get_seconds(); |
8fd17795 | 67 | list_add_tail(&cur_trans->list, &root->fs_info->trans_list); |
7c4452b9 | 68 | init_bit_radix(&cur_trans->dirty_pages); |
15ee9bc7 JB |
69 | } else { |
70 | cur_trans->num_writers++; | |
71 | cur_trans->num_joined++; | |
79154b1b | 72 | } |
15ee9bc7 | 73 | |
79154b1b CM |
74 | return 0; |
75 | } | |
76 | ||
6702ed49 CM |
77 | static int record_root_in_trans(struct btrfs_root *root) |
78 | { | |
79 | u64 running_trans_id = root->fs_info->running_transaction->transid; | |
80 | if (root->ref_cows && root->last_trans < running_trans_id) { | |
81 | WARN_ON(root == root->fs_info->extent_root); | |
82 | if (root->root_item.refs != 0) { | |
83 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, | |
84 | (unsigned long)root->root_key.objectid, | |
85 | BTRFS_ROOT_TRANS_TAG); | |
86 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, | |
87 | (unsigned long)root->root_key.objectid, | |
88 | BTRFS_ROOT_DEFRAG_TAG); | |
89 | root->commit_root = root->node; | |
90 | get_bh(root->node); | |
91 | } else { | |
92 | WARN_ON(1); | |
93 | } | |
94 | root->last_trans = running_trans_id; | |
95 | } | |
96 | return 0; | |
97 | } | |
98 | ||
79154b1b CM |
99 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
100 | int num_blocks) | |
101 | { | |
2c90e5d6 CM |
102 | struct btrfs_trans_handle *h = |
103 | kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); | |
79154b1b CM |
104 | int ret; |
105 | ||
106 | mutex_lock(&root->fs_info->trans_mutex); | |
107 | ret = join_transaction(root); | |
108 | BUG_ON(ret); | |
0f7d52f4 | 109 | |
6702ed49 CM |
110 | record_root_in_trans(root); |
111 | h->transid = root->fs_info->running_transaction->transid; | |
79154b1b CM |
112 | h->transaction = root->fs_info->running_transaction; |
113 | h->blocks_reserved = num_blocks; | |
114 | h->blocks_used = 0; | |
31f3c99b | 115 | h->block_group = NULL; |
26b8003f CM |
116 | h->alloc_exclude_nr = 0; |
117 | h->alloc_exclude_start = 0; | |
79154b1b CM |
118 | root->fs_info->running_transaction->use_count++; |
119 | mutex_unlock(&root->fs_info->trans_mutex); | |
120 | return h; | |
121 | } | |
122 | ||
123 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, | |
124 | struct btrfs_root *root) | |
125 | { | |
126 | struct btrfs_transaction *cur_trans; | |
d6e4a428 | 127 | |
79154b1b CM |
128 | mutex_lock(&root->fs_info->trans_mutex); |
129 | cur_trans = root->fs_info->running_transaction; | |
ccd467d6 | 130 | WARN_ON(cur_trans != trans->transaction); |
d5719762 | 131 | WARN_ON(cur_trans->num_writers < 1); |
ccd467d6 | 132 | cur_trans->num_writers--; |
79154b1b CM |
133 | if (waitqueue_active(&cur_trans->writer_wait)) |
134 | wake_up(&cur_trans->writer_wait); | |
79154b1b CM |
135 | put_transaction(cur_trans); |
136 | mutex_unlock(&root->fs_info->trans_mutex); | |
d6025579 | 137 | memset(trans, 0, sizeof(*trans)); |
2c90e5d6 | 138 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b CM |
139 | return 0; |
140 | } | |
141 | ||
142 | ||
143 | int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, | |
144 | struct btrfs_root *root) | |
145 | { | |
7c4452b9 CM |
146 | unsigned long gang[16]; |
147 | int ret; | |
148 | int i; | |
149 | int err; | |
150 | int werr = 0; | |
151 | struct page *page; | |
152 | struct radix_tree_root *dirty_pages; | |
153 | struct inode *btree_inode = root->fs_info->btree_inode; | |
154 | ||
155 | if (!trans || !trans->transaction) { | |
156 | return filemap_write_and_wait(btree_inode->i_mapping); | |
157 | } | |
158 | dirty_pages = &trans->transaction->dirty_pages; | |
159 | while(1) { | |
e37c9e69 CM |
160 | ret = find_first_radix_bit(dirty_pages, gang, |
161 | 0, ARRAY_SIZE(gang)); | |
7c4452b9 CM |
162 | if (!ret) |
163 | break; | |
164 | for (i = 0; i < ret; i++) { | |
165 | /* FIXME EIO */ | |
166 | clear_radix_bit(dirty_pages, gang[i]); | |
167 | page = find_lock_page(btree_inode->i_mapping, | |
168 | gang[i]); | |
169 | if (!page) | |
170 | continue; | |
6702ed49 CM |
171 | if (PageWriteback(page)) { |
172 | if (PageDirty(page)) | |
173 | wait_on_page_writeback(page); | |
174 | else { | |
175 | unlock_page(page); | |
176 | page_cache_release(page); | |
177 | continue; | |
178 | } | |
179 | } | |
7c4452b9 CM |
180 | err = write_one_page(page, 0); |
181 | if (err) | |
182 | werr = err; | |
183 | page_cache_release(page); | |
184 | } | |
185 | } | |
186 | err = filemap_fdatawait(btree_inode->i_mapping); | |
187 | if (err) | |
188 | werr = err; | |
189 | return werr; | |
79154b1b CM |
190 | } |
191 | ||
192 | int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans, | |
193 | struct btrfs_root *root) | |
194 | { | |
195 | int ret; | |
196 | u64 old_extent_block; | |
197 | struct btrfs_fs_info *fs_info = root->fs_info; | |
198 | struct btrfs_root *tree_root = fs_info->tree_root; | |
199 | struct btrfs_root *extent_root = fs_info->extent_root; | |
79154b1b | 200 | |
9078a3e1 | 201 | btrfs_write_dirty_block_groups(trans, extent_root); |
79154b1b CM |
202 | while(1) { |
203 | old_extent_block = btrfs_root_blocknr(&extent_root->root_item); | |
7eccb903 | 204 | if (old_extent_block == bh_blocknr(extent_root->node)) |
79154b1b CM |
205 | break; |
206 | btrfs_set_root_blocknr(&extent_root->root_item, | |
7eccb903 | 207 | bh_blocknr(extent_root->node)); |
79154b1b CM |
208 | ret = btrfs_update_root(trans, tree_root, |
209 | &extent_root->root_key, | |
210 | &extent_root->root_item); | |
211 | BUG_ON(ret); | |
9078a3e1 | 212 | btrfs_write_dirty_block_groups(trans, extent_root); |
79154b1b CM |
213 | } |
214 | return 0; | |
215 | } | |
216 | ||
217 | static int wait_for_commit(struct btrfs_root *root, | |
218 | struct btrfs_transaction *commit) | |
219 | { | |
220 | DEFINE_WAIT(wait); | |
ccd467d6 | 221 | mutex_lock(&root->fs_info->trans_mutex); |
79154b1b CM |
222 | while(!commit->commit_done) { |
223 | prepare_to_wait(&commit->commit_wait, &wait, | |
224 | TASK_UNINTERRUPTIBLE); | |
225 | if (commit->commit_done) | |
226 | break; | |
227 | mutex_unlock(&root->fs_info->trans_mutex); | |
228 | schedule(); | |
229 | mutex_lock(&root->fs_info->trans_mutex); | |
230 | } | |
ccd467d6 | 231 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b CM |
232 | finish_wait(&commit->commit_wait, &wait); |
233 | return 0; | |
234 | } | |
235 | ||
0f7d52f4 CM |
236 | struct dirty_root { |
237 | struct list_head list; | |
0f7d52f4 | 238 | struct btrfs_root *root; |
58176a96 | 239 | struct btrfs_root *latest_root; |
0f7d52f4 CM |
240 | }; |
241 | ||
5ce14bbc CM |
242 | int btrfs_add_dead_root(struct btrfs_root *root, |
243 | struct btrfs_root *latest, | |
244 | struct list_head *dead_list) | |
5eda7b5e CM |
245 | { |
246 | struct dirty_root *dirty; | |
247 | ||
248 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
249 | if (!dirty) | |
250 | return -ENOMEM; | |
5eda7b5e | 251 | dirty->root = root; |
5ce14bbc | 252 | dirty->latest_root = latest; |
5eda7b5e CM |
253 | list_add(&dirty->list, dead_list); |
254 | return 0; | |
255 | } | |
256 | ||
35b7e476 CM |
257 | static int add_dirty_roots(struct btrfs_trans_handle *trans, |
258 | struct radix_tree_root *radix, | |
259 | struct list_head *list) | |
0f7d52f4 CM |
260 | { |
261 | struct dirty_root *dirty; | |
262 | struct btrfs_root *gang[8]; | |
263 | struct btrfs_root *root; | |
264 | int i; | |
265 | int ret; | |
54aa1f4d | 266 | int err = 0; |
5eda7b5e | 267 | u32 refs; |
54aa1f4d | 268 | |
0f7d52f4 CM |
269 | while(1) { |
270 | ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0, | |
271 | ARRAY_SIZE(gang), | |
272 | BTRFS_ROOT_TRANS_TAG); | |
273 | if (ret == 0) | |
274 | break; | |
275 | for (i = 0; i < ret; i++) { | |
276 | root = gang[i]; | |
2619ba1f CM |
277 | radix_tree_tag_clear(radix, |
278 | (unsigned long)root->root_key.objectid, | |
279 | BTRFS_ROOT_TRANS_TAG); | |
0f7d52f4 | 280 | if (root->commit_root == root->node) { |
7eccb903 | 281 | WARN_ON(bh_blocknr(root->node) != |
0f7d52f4 CM |
282 | btrfs_root_blocknr(&root->root_item)); |
283 | brelse(root->commit_root); | |
284 | root->commit_root = NULL; | |
58176a96 JB |
285 | |
286 | /* make sure to update the root on disk | |
287 | * so we get any updates to the block used | |
288 | * counts | |
289 | */ | |
290 | err = btrfs_update_root(trans, | |
291 | root->fs_info->tree_root, | |
292 | &root->root_key, | |
293 | &root->root_item); | |
0f7d52f4 CM |
294 | continue; |
295 | } | |
296 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
297 | BUG_ON(!dirty); | |
9f3a7427 CM |
298 | dirty->root = kmalloc(sizeof(*dirty->root), GFP_NOFS); |
299 | BUG_ON(!dirty->root); | |
300 | ||
301 | memset(&root->root_item.drop_progress, 0, | |
302 | sizeof(struct btrfs_disk_key)); | |
303 | root->root_item.drop_level = 0; | |
304 | ||
305 | memcpy(dirty->root, root, sizeof(*root)); | |
306 | dirty->root->node = root->commit_root; | |
58176a96 | 307 | dirty->latest_root = root; |
0f7d52f4 | 308 | root->commit_root = NULL; |
5eda7b5e | 309 | |
0f7d52f4 CM |
310 | root->root_key.offset = root->fs_info->generation; |
311 | btrfs_set_root_blocknr(&root->root_item, | |
7eccb903 | 312 | bh_blocknr(root->node)); |
0f7d52f4 CM |
313 | err = btrfs_insert_root(trans, root->fs_info->tree_root, |
314 | &root->root_key, | |
315 | &root->root_item); | |
54aa1f4d CM |
316 | if (err) |
317 | break; | |
9f3a7427 CM |
318 | |
319 | refs = btrfs_root_refs(&dirty->root->root_item); | |
320 | btrfs_set_root_refs(&dirty->root->root_item, refs - 1); | |
5eda7b5e | 321 | err = btrfs_update_root(trans, root->fs_info->tree_root, |
9f3a7427 CM |
322 | &dirty->root->root_key, |
323 | &dirty->root->root_item); | |
5eda7b5e CM |
324 | |
325 | BUG_ON(err); | |
9f3a7427 | 326 | if (refs == 1) { |
5eda7b5e | 327 | list_add(&dirty->list, list); |
9f3a7427 CM |
328 | } else { |
329 | WARN_ON(1); | |
330 | kfree(dirty->root); | |
5eda7b5e | 331 | kfree(dirty); |
9f3a7427 | 332 | } |
0f7d52f4 CM |
333 | } |
334 | } | |
54aa1f4d | 335 | return err; |
0f7d52f4 CM |
336 | } |
337 | ||
e9d0b13b CM |
338 | int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) |
339 | { | |
340 | struct btrfs_fs_info *info = root->fs_info; | |
341 | int ret; | |
342 | struct btrfs_trans_handle *trans; | |
343 | ||
344 | if (root->defrag_running) | |
345 | return 0; | |
346 | ||
347 | trans = btrfs_start_transaction(root, 1); | |
348 | while (1) { | |
349 | root->defrag_running = 1; | |
350 | ret = btrfs_defrag_leaves(trans, root, cacheonly); | |
351 | btrfs_end_transaction(trans, root); | |
352 | mutex_unlock(&info->fs_mutex); | |
353 | ||
354 | btrfs_btree_balance_dirty(root); | |
355 | cond_resched(); | |
356 | ||
357 | mutex_lock(&info->fs_mutex); | |
358 | trans = btrfs_start_transaction(root, 1); | |
359 | if (ret != -EAGAIN) | |
360 | break; | |
361 | } | |
362 | root->defrag_running = 0; | |
363 | radix_tree_tag_clear(&info->fs_roots_radix, | |
364 | (unsigned long)root->root_key.objectid, | |
365 | BTRFS_ROOT_DEFRAG_TAG); | |
366 | btrfs_end_transaction(trans, root); | |
367 | return 0; | |
368 | } | |
369 | ||
6702ed49 CM |
370 | int btrfs_defrag_dirty_roots(struct btrfs_fs_info *info) |
371 | { | |
372 | struct btrfs_root *gang[1]; | |
373 | struct btrfs_root *root; | |
6702ed49 CM |
374 | int i; |
375 | int ret; | |
376 | int err = 0; | |
377 | u64 last = 0; | |
378 | ||
6702ed49 CM |
379 | while(1) { |
380 | ret = radix_tree_gang_lookup_tag(&info->fs_roots_radix, | |
381 | (void **)gang, last, | |
382 | ARRAY_SIZE(gang), | |
383 | BTRFS_ROOT_DEFRAG_TAG); | |
384 | if (ret == 0) | |
385 | break; | |
386 | for (i = 0; i < ret; i++) { | |
387 | root = gang[i]; | |
388 | last = root->root_key.objectid + 1; | |
e9d0b13b | 389 | btrfs_defrag_root(root, 1); |
6702ed49 CM |
390 | } |
391 | } | |
e9d0b13b | 392 | btrfs_defrag_root(info->extent_root, 1); |
6702ed49 CM |
393 | return err; |
394 | } | |
395 | ||
35b7e476 CM |
396 | static int drop_dirty_roots(struct btrfs_root *tree_root, |
397 | struct list_head *list) | |
0f7d52f4 CM |
398 | { |
399 | struct dirty_root *dirty; | |
400 | struct btrfs_trans_handle *trans; | |
58176a96 JB |
401 | u64 num_blocks; |
402 | u64 blocks_used; | |
54aa1f4d | 403 | int ret = 0; |
9f3a7427 CM |
404 | int err; |
405 | ||
0f7d52f4 | 406 | while(!list_empty(list)) { |
58176a96 JB |
407 | struct btrfs_root *root; |
408 | ||
facda1e7 | 409 | mutex_lock(&tree_root->fs_info->fs_mutex); |
0f7d52f4 CM |
410 | dirty = list_entry(list->next, struct dirty_root, list); |
411 | list_del_init(&dirty->list); | |
5eda7b5e | 412 | |
58176a96 JB |
413 | num_blocks = btrfs_root_blocks_used(&dirty->root->root_item); |
414 | root = dirty->latest_root; | |
415 | ||
9f3a7427 CM |
416 | while(1) { |
417 | trans = btrfs_start_transaction(tree_root, 1); | |
418 | ret = btrfs_drop_snapshot(trans, dirty->root); | |
419 | if (ret != -EAGAIN) { | |
420 | break; | |
421 | } | |
58176a96 | 422 | |
9f3a7427 CM |
423 | err = btrfs_update_root(trans, |
424 | tree_root, | |
425 | &dirty->root->root_key, | |
426 | &dirty->root->root_item); | |
427 | if (err) | |
428 | ret = err; | |
429 | ret = btrfs_end_transaction(trans, tree_root); | |
430 | BUG_ON(ret); | |
f4468e94 CM |
431 | mutex_unlock(&tree_root->fs_info->fs_mutex); |
432 | ||
433 | btrfs_btree_balance_dirty(tree_root); | |
434 | schedule(); | |
435 | ||
436 | mutex_lock(&tree_root->fs_info->fs_mutex); | |
9f3a7427 | 437 | } |
0f7d52f4 | 438 | BUG_ON(ret); |
58176a96 JB |
439 | |
440 | num_blocks -= btrfs_root_blocks_used(&dirty->root->root_item); | |
441 | blocks_used = btrfs_root_blocks_used(&root->root_item); | |
442 | if (num_blocks) { | |
443 | record_root_in_trans(root); | |
444 | btrfs_set_root_blocks_used(&root->root_item, | |
445 | blocks_used - num_blocks); | |
446 | } | |
9f3a7427 | 447 | ret = btrfs_del_root(trans, tree_root, &dirty->root->root_key); |
58176a96 JB |
448 | if (ret) { |
449 | BUG(); | |
54aa1f4d | 450 | break; |
58176a96 | 451 | } |
0f7d52f4 CM |
452 | ret = btrfs_end_transaction(trans, tree_root); |
453 | BUG_ON(ret); | |
5eda7b5e | 454 | |
9f3a7427 | 455 | kfree(dirty->root); |
0f7d52f4 | 456 | kfree(dirty); |
facda1e7 | 457 | mutex_unlock(&tree_root->fs_info->fs_mutex); |
8c2383c3 | 458 | btrfs_btree_balance_dirty(tree_root); |
f4468e94 | 459 | schedule(); |
0f7d52f4 | 460 | } |
54aa1f4d | 461 | return ret; |
0f7d52f4 CM |
462 | } |
463 | ||
79154b1b CM |
464 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
465 | struct btrfs_root *root) | |
466 | { | |
15ee9bc7 JB |
467 | unsigned long joined = 0; |
468 | unsigned long timeout = 1; | |
79154b1b | 469 | struct btrfs_transaction *cur_trans; |
8fd17795 | 470 | struct btrfs_transaction *prev_trans = NULL; |
0f7d52f4 | 471 | struct list_head dirty_fs_roots; |
ccd467d6 | 472 | struct radix_tree_root pinned_copy; |
79154b1b | 473 | DEFINE_WAIT(wait); |
15ee9bc7 | 474 | int ret; |
79154b1b | 475 | |
ccd467d6 | 476 | init_bit_radix(&pinned_copy); |
0f7d52f4 | 477 | INIT_LIST_HEAD(&dirty_fs_roots); |
d6e4a428 | 478 | |
79154b1b CM |
479 | mutex_lock(&root->fs_info->trans_mutex); |
480 | if (trans->transaction->in_commit) { | |
481 | cur_trans = trans->transaction; | |
482 | trans->transaction->use_count++; | |
ccd467d6 | 483 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b | 484 | btrfs_end_transaction(trans, root); |
ccd467d6 CM |
485 | |
486 | mutex_unlock(&root->fs_info->fs_mutex); | |
79154b1b CM |
487 | ret = wait_for_commit(root, cur_trans); |
488 | BUG_ON(ret); | |
15ee9bc7 JB |
489 | |
490 | mutex_lock(&root->fs_info->trans_mutex); | |
79154b1b | 491 | put_transaction(cur_trans); |
15ee9bc7 JB |
492 | mutex_unlock(&root->fs_info->trans_mutex); |
493 | ||
ccd467d6 | 494 | mutex_lock(&root->fs_info->fs_mutex); |
79154b1b CM |
495 | return 0; |
496 | } | |
2c90e5d6 | 497 | trans->transaction->in_commit = 1; |
ccd467d6 CM |
498 | cur_trans = trans->transaction; |
499 | if (cur_trans->list.prev != &root->fs_info->trans_list) { | |
500 | prev_trans = list_entry(cur_trans->list.prev, | |
501 | struct btrfs_transaction, list); | |
502 | if (!prev_trans->commit_done) { | |
503 | prev_trans->use_count++; | |
504 | mutex_unlock(&root->fs_info->fs_mutex); | |
505 | mutex_unlock(&root->fs_info->trans_mutex); | |
506 | ||
507 | wait_for_commit(root, prev_trans); | |
ccd467d6 CM |
508 | |
509 | mutex_lock(&root->fs_info->fs_mutex); | |
510 | mutex_lock(&root->fs_info->trans_mutex); | |
15ee9bc7 | 511 | put_transaction(prev_trans); |
ccd467d6 CM |
512 | } |
513 | } | |
15ee9bc7 JB |
514 | |
515 | do { | |
516 | joined = cur_trans->num_joined; | |
2c90e5d6 | 517 | WARN_ON(cur_trans != trans->transaction); |
15ee9bc7 | 518 | prepare_to_wait(&cur_trans->writer_wait, &wait, |
79154b1b | 519 | TASK_UNINTERRUPTIBLE); |
15ee9bc7 JB |
520 | |
521 | if (cur_trans->num_writers > 1) | |
522 | timeout = MAX_SCHEDULE_TIMEOUT; | |
523 | else | |
524 | timeout = 1; | |
525 | ||
ccd467d6 | 526 | mutex_unlock(&root->fs_info->fs_mutex); |
79154b1b | 527 | mutex_unlock(&root->fs_info->trans_mutex); |
15ee9bc7 JB |
528 | |
529 | schedule_timeout(timeout); | |
530 | ||
ccd467d6 | 531 | mutex_lock(&root->fs_info->fs_mutex); |
79154b1b | 532 | mutex_lock(&root->fs_info->trans_mutex); |
15ee9bc7 JB |
533 | finish_wait(&cur_trans->writer_wait, &wait); |
534 | } while (cur_trans->num_writers > 1 || | |
535 | (cur_trans->num_joined != joined)); | |
536 | ||
2c90e5d6 | 537 | WARN_ON(cur_trans != trans->transaction); |
54aa1f4d CM |
538 | ret = add_dirty_roots(trans, &root->fs_info->fs_roots_radix, |
539 | &dirty_fs_roots); | |
540 | BUG_ON(ret); | |
541 | ||
79154b1b CM |
542 | ret = btrfs_commit_tree_roots(trans, root); |
543 | BUG_ON(ret); | |
54aa1f4d | 544 | |
78fae27e CM |
545 | cur_trans = root->fs_info->running_transaction; |
546 | root->fs_info->running_transaction = NULL; | |
4b52dff6 CM |
547 | btrfs_set_super_generation(&root->fs_info->super_copy, |
548 | cur_trans->transid); | |
549 | btrfs_set_super_root(&root->fs_info->super_copy, | |
550 | bh_blocknr(root->fs_info->tree_root->node)); | |
551 | memcpy(root->fs_info->disk_super, &root->fs_info->super_copy, | |
552 | sizeof(root->fs_info->super_copy)); | |
ccd467d6 CM |
553 | |
554 | btrfs_copy_pinned(root, &pinned_copy); | |
555 | ||
78fae27e | 556 | mutex_unlock(&root->fs_info->trans_mutex); |
8fd17795 | 557 | mutex_unlock(&root->fs_info->fs_mutex); |
79154b1b CM |
558 | ret = btrfs_write_and_wait_transaction(trans, root); |
559 | BUG_ON(ret); | |
79154b1b | 560 | write_ctree_super(trans, root); |
8fd17795 | 561 | mutex_lock(&root->fs_info->fs_mutex); |
ccd467d6 | 562 | btrfs_finish_extent_commit(trans, root, &pinned_copy); |
78fae27e | 563 | mutex_lock(&root->fs_info->trans_mutex); |
2c90e5d6 | 564 | cur_trans->commit_done = 1; |
15ee9bc7 | 565 | root->fs_info->last_trans_committed = cur_trans->transid; |
2c90e5d6 | 566 | wake_up(&cur_trans->commit_wait); |
78fae27e | 567 | put_transaction(cur_trans); |
79154b1b | 568 | put_transaction(cur_trans); |
58176a96 | 569 | |
facda1e7 CM |
570 | if (root->fs_info->closing) |
571 | list_splice_init(&root->fs_info->dead_roots, &dirty_fs_roots); | |
572 | else | |
573 | list_splice_init(&dirty_fs_roots, &root->fs_info->dead_roots); | |
58176a96 | 574 | |
78fae27e | 575 | mutex_unlock(&root->fs_info->trans_mutex); |
2c90e5d6 | 576 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b | 577 | |
facda1e7 CM |
578 | if (root->fs_info->closing) { |
579 | mutex_unlock(&root->fs_info->fs_mutex); | |
580 | drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots); | |
581 | mutex_lock(&root->fs_info->fs_mutex); | |
582 | } | |
79154b1b CM |
583 | return ret; |
584 | } | |
585 | ||
e9d0b13b CM |
586 | int btrfs_clean_old_snapshots(struct btrfs_root *root) |
587 | { | |
588 | struct list_head dirty_roots; | |
589 | INIT_LIST_HEAD(&dirty_roots); | |
590 | ||
591 | mutex_lock(&root->fs_info->trans_mutex); | |
592 | list_splice_init(&root->fs_info->dead_roots, &dirty_roots); | |
593 | mutex_unlock(&root->fs_info->trans_mutex); | |
594 | ||
595 | if (!list_empty(&dirty_roots)) { | |
596 | drop_dirty_roots(root, &dirty_roots); | |
597 | } | |
598 | return 0; | |
599 | } | |
08607c1b CM |
600 | void btrfs_transaction_cleaner(struct work_struct *work) |
601 | { | |
602 | struct btrfs_fs_info *fs_info = container_of(work, | |
603 | struct btrfs_fs_info, | |
604 | trans_work.work); | |
605 | ||
606 | struct btrfs_root *root = fs_info->tree_root; | |
607 | struct btrfs_transaction *cur; | |
608 | struct btrfs_trans_handle *trans; | |
609 | unsigned long now; | |
610 | unsigned long delay = HZ * 30; | |
611 | int ret; | |
612 | ||
08607c1b CM |
613 | mutex_lock(&root->fs_info->fs_mutex); |
614 | mutex_lock(&root->fs_info->trans_mutex); | |
615 | cur = root->fs_info->running_transaction; | |
616 | if (!cur) { | |
617 | mutex_unlock(&root->fs_info->trans_mutex); | |
618 | goto out; | |
619 | } | |
620 | now = get_seconds(); | |
621 | if (now < cur->start_time || now - cur->start_time < 30) { | |
622 | mutex_unlock(&root->fs_info->trans_mutex); | |
623 | delay = HZ * 5; | |
624 | goto out; | |
625 | } | |
626 | mutex_unlock(&root->fs_info->trans_mutex); | |
6702ed49 | 627 | btrfs_defrag_dirty_roots(root->fs_info); |
08607c1b CM |
628 | trans = btrfs_start_transaction(root, 1); |
629 | ret = btrfs_commit_transaction(trans, root); | |
630 | out: | |
631 | mutex_unlock(&root->fs_info->fs_mutex); | |
e9d0b13b | 632 | btrfs_clean_old_snapshots(root); |
08607c1b CM |
633 | btrfs_transaction_queue_work(root, delay); |
634 | } | |
635 | ||
636 | void btrfs_transaction_queue_work(struct btrfs_root *root, int delay) | |
637 | { | |
638 | queue_delayed_work(trans_wq, &root->fs_info->trans_work, delay); | |
639 | } | |
640 | ||
641 | void btrfs_transaction_flush_work(struct btrfs_root *root) | |
642 | { | |
643 | cancel_rearming_delayed_workqueue(trans_wq, &root->fs_info->trans_work); | |
644 | flush_workqueue(trans_wq); | |
645 | } | |
646 | ||
647 | void __init btrfs_init_transaction_sys(void) | |
648 | { | |
649 | trans_wq = create_workqueue("btrfs"); | |
650 | } | |
651 | ||
652 | void __exit btrfs_exit_transaction_sys(void) | |
653 | { | |
654 | destroy_workqueue(trans_wq); | |
655 | } | |
656 |