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> |
d3c2fdcf | 21 | #include <linux/writeback.h> |
5f39d397 | 22 | #include <linux/pagemap.h> |
79154b1b CM |
23 | #include "ctree.h" |
24 | #include "disk-io.h" | |
25 | #include "transaction.h" | |
26 | ||
78fae27e | 27 | static int total_trans = 0; |
2c90e5d6 CM |
28 | extern struct kmem_cache *btrfs_trans_handle_cachep; |
29 | extern struct kmem_cache *btrfs_transaction_cachep; | |
30 | ||
08607c1b CM |
31 | static struct workqueue_struct *trans_wq; |
32 | ||
0f7d52f4 | 33 | #define BTRFS_ROOT_TRANS_TAG 0 |
6702ed49 | 34 | #define BTRFS_ROOT_DEFRAG_TAG 1 |
0f7d52f4 | 35 | |
79154b1b CM |
36 | static void put_transaction(struct btrfs_transaction *transaction) |
37 | { | |
2c90e5d6 | 38 | WARN_ON(transaction->use_count == 0); |
79154b1b | 39 | transaction->use_count--; |
78fae27e CM |
40 | if (transaction->use_count == 0) { |
41 | WARN_ON(total_trans == 0); | |
42 | total_trans--; | |
8fd17795 | 43 | list_del_init(&transaction->list); |
2c90e5d6 CM |
44 | memset(transaction, 0, sizeof(*transaction)); |
45 | kmem_cache_free(btrfs_transaction_cachep, transaction); | |
78fae27e | 46 | } |
79154b1b CM |
47 | } |
48 | ||
49 | static int join_transaction(struct btrfs_root *root) | |
50 | { | |
51 | struct btrfs_transaction *cur_trans; | |
52 | cur_trans = root->fs_info->running_transaction; | |
53 | if (!cur_trans) { | |
2c90e5d6 CM |
54 | cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, |
55 | GFP_NOFS); | |
78fae27e | 56 | total_trans++; |
79154b1b | 57 | BUG_ON(!cur_trans); |
0f7d52f4 | 58 | root->fs_info->generation++; |
79154b1b | 59 | root->fs_info->running_transaction = cur_trans; |
15ee9bc7 JB |
60 | cur_trans->num_writers = 1; |
61 | cur_trans->num_joined = 0; | |
0f7d52f4 | 62 | cur_trans->transid = root->fs_info->generation; |
79154b1b CM |
63 | init_waitqueue_head(&cur_trans->writer_wait); |
64 | init_waitqueue_head(&cur_trans->commit_wait); | |
65 | cur_trans->in_commit = 0; | |
d5719762 | 66 | cur_trans->use_count = 1; |
79154b1b | 67 | cur_trans->commit_done = 0; |
08607c1b | 68 | cur_trans->start_time = get_seconds(); |
8fd17795 | 69 | list_add_tail(&cur_trans->list, &root->fs_info->trans_list); |
5f39d397 CM |
70 | extent_map_tree_init(&cur_trans->dirty_pages, |
71 | root->fs_info->btree_inode->i_mapping, | |
72 | GFP_NOFS); | |
15ee9bc7 JB |
73 | } else { |
74 | cur_trans->num_writers++; | |
75 | cur_trans->num_joined++; | |
79154b1b | 76 | } |
15ee9bc7 | 77 | |
79154b1b CM |
78 | return 0; |
79 | } | |
80 | ||
6702ed49 CM |
81 | static int record_root_in_trans(struct btrfs_root *root) |
82 | { | |
83 | u64 running_trans_id = root->fs_info->running_transaction->transid; | |
84 | if (root->ref_cows && root->last_trans < running_trans_id) { | |
85 | WARN_ON(root == root->fs_info->extent_root); | |
86 | if (root->root_item.refs != 0) { | |
87 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, | |
88 | (unsigned long)root->root_key.objectid, | |
89 | BTRFS_ROOT_TRANS_TAG); | |
90 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, | |
91 | (unsigned long)root->root_key.objectid, | |
92 | BTRFS_ROOT_DEFRAG_TAG); | |
93 | root->commit_root = root->node; | |
5f39d397 | 94 | extent_buffer_get(root->node); |
6702ed49 CM |
95 | } else { |
96 | WARN_ON(1); | |
97 | } | |
98 | root->last_trans = running_trans_id; | |
99 | } | |
100 | return 0; | |
101 | } | |
102 | ||
79154b1b CM |
103 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
104 | int num_blocks) | |
105 | { | |
2c90e5d6 CM |
106 | struct btrfs_trans_handle *h = |
107 | kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); | |
79154b1b CM |
108 | int ret; |
109 | ||
110 | mutex_lock(&root->fs_info->trans_mutex); | |
111 | ret = join_transaction(root); | |
112 | BUG_ON(ret); | |
0f7d52f4 | 113 | |
6702ed49 CM |
114 | record_root_in_trans(root); |
115 | h->transid = root->fs_info->running_transaction->transid; | |
79154b1b CM |
116 | h->transaction = root->fs_info->running_transaction; |
117 | h->blocks_reserved = num_blocks; | |
118 | h->blocks_used = 0; | |
31f3c99b | 119 | h->block_group = NULL; |
26b8003f CM |
120 | h->alloc_exclude_nr = 0; |
121 | h->alloc_exclude_start = 0; | |
79154b1b CM |
122 | root->fs_info->running_transaction->use_count++; |
123 | mutex_unlock(&root->fs_info->trans_mutex); | |
124 | return h; | |
125 | } | |
126 | ||
127 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, | |
128 | struct btrfs_root *root) | |
129 | { | |
130 | struct btrfs_transaction *cur_trans; | |
d6e4a428 | 131 | |
79154b1b CM |
132 | mutex_lock(&root->fs_info->trans_mutex); |
133 | cur_trans = root->fs_info->running_transaction; | |
ccd467d6 | 134 | WARN_ON(cur_trans != trans->transaction); |
d5719762 | 135 | WARN_ON(cur_trans->num_writers < 1); |
ccd467d6 | 136 | cur_trans->num_writers--; |
79154b1b CM |
137 | if (waitqueue_active(&cur_trans->writer_wait)) |
138 | wake_up(&cur_trans->writer_wait); | |
79154b1b CM |
139 | put_transaction(cur_trans); |
140 | mutex_unlock(&root->fs_info->trans_mutex); | |
d6025579 | 141 | memset(trans, 0, sizeof(*trans)); |
2c90e5d6 | 142 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b CM |
143 | return 0; |
144 | } | |
145 | ||
146 | ||
147 | int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, | |
148 | struct btrfs_root *root) | |
149 | { | |
7c4452b9 | 150 | int ret; |
7c4452b9 CM |
151 | int err; |
152 | int werr = 0; | |
5f39d397 | 153 | struct extent_map_tree *dirty_pages; |
7c4452b9 | 154 | struct page *page; |
7c4452b9 | 155 | struct inode *btree_inode = root->fs_info->btree_inode; |
5f39d397 CM |
156 | u64 start; |
157 | u64 end; | |
158 | unsigned long index; | |
7c4452b9 CM |
159 | |
160 | if (!trans || !trans->transaction) { | |
161 | return filemap_write_and_wait(btree_inode->i_mapping); | |
162 | } | |
163 | dirty_pages = &trans->transaction->dirty_pages; | |
164 | while(1) { | |
5f39d397 CM |
165 | ret = find_first_extent_bit(dirty_pages, 0, &start, &end, |
166 | EXTENT_DIRTY); | |
167 | if (ret) | |
7c4452b9 | 168 | break; |
5f39d397 CM |
169 | clear_extent_dirty(dirty_pages, start, end, GFP_NOFS); |
170 | while(start <= end) { | |
171 | index = start >> PAGE_CACHE_SHIFT; | |
172 | start = (index + 1) << PAGE_CACHE_SHIFT; | |
173 | page = find_lock_page(btree_inode->i_mapping, index); | |
7c4452b9 CM |
174 | if (!page) |
175 | continue; | |
6702ed49 CM |
176 | if (PageWriteback(page)) { |
177 | if (PageDirty(page)) | |
178 | wait_on_page_writeback(page); | |
179 | else { | |
180 | unlock_page(page); | |
181 | page_cache_release(page); | |
182 | continue; | |
183 | } | |
184 | } | |
7c4452b9 CM |
185 | err = write_one_page(page, 0); |
186 | if (err) | |
187 | werr = err; | |
188 | page_cache_release(page); | |
189 | } | |
190 | } | |
191 | err = filemap_fdatawait(btree_inode->i_mapping); | |
192 | if (err) | |
193 | werr = err; | |
194 | return werr; | |
79154b1b CM |
195 | } |
196 | ||
197 | int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans, | |
198 | struct btrfs_root *root) | |
199 | { | |
200 | int ret; | |
201 | u64 old_extent_block; | |
202 | struct btrfs_fs_info *fs_info = root->fs_info; | |
203 | struct btrfs_root *tree_root = fs_info->tree_root; | |
204 | struct btrfs_root *extent_root = fs_info->extent_root; | |
79154b1b | 205 | |
9078a3e1 | 206 | btrfs_write_dirty_block_groups(trans, extent_root); |
79154b1b CM |
207 | while(1) { |
208 | old_extent_block = btrfs_root_blocknr(&extent_root->root_item); | |
5f39d397 CM |
209 | if (old_extent_block == |
210 | extent_buffer_blocknr(extent_root->node)) | |
79154b1b CM |
211 | break; |
212 | btrfs_set_root_blocknr(&extent_root->root_item, | |
5f39d397 | 213 | extent_buffer_blocknr(extent_root->node)); |
79154b1b CM |
214 | ret = btrfs_update_root(trans, tree_root, |
215 | &extent_root->root_key, | |
216 | &extent_root->root_item); | |
217 | BUG_ON(ret); | |
9078a3e1 | 218 | btrfs_write_dirty_block_groups(trans, extent_root); |
79154b1b CM |
219 | } |
220 | return 0; | |
221 | } | |
222 | ||
223 | static int wait_for_commit(struct btrfs_root *root, | |
224 | struct btrfs_transaction *commit) | |
225 | { | |
226 | DEFINE_WAIT(wait); | |
ccd467d6 | 227 | mutex_lock(&root->fs_info->trans_mutex); |
79154b1b CM |
228 | while(!commit->commit_done) { |
229 | prepare_to_wait(&commit->commit_wait, &wait, | |
230 | TASK_UNINTERRUPTIBLE); | |
231 | if (commit->commit_done) | |
232 | break; | |
233 | mutex_unlock(&root->fs_info->trans_mutex); | |
234 | schedule(); | |
235 | mutex_lock(&root->fs_info->trans_mutex); | |
236 | } | |
ccd467d6 | 237 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b CM |
238 | finish_wait(&commit->commit_wait, &wait); |
239 | return 0; | |
240 | } | |
241 | ||
0f7d52f4 CM |
242 | struct dirty_root { |
243 | struct list_head list; | |
0f7d52f4 | 244 | struct btrfs_root *root; |
58176a96 | 245 | struct btrfs_root *latest_root; |
0f7d52f4 CM |
246 | }; |
247 | ||
5ce14bbc CM |
248 | int btrfs_add_dead_root(struct btrfs_root *root, |
249 | struct btrfs_root *latest, | |
250 | struct list_head *dead_list) | |
5eda7b5e CM |
251 | { |
252 | struct dirty_root *dirty; | |
253 | ||
254 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
255 | if (!dirty) | |
256 | return -ENOMEM; | |
5eda7b5e | 257 | dirty->root = root; |
5ce14bbc | 258 | dirty->latest_root = latest; |
5eda7b5e CM |
259 | list_add(&dirty->list, dead_list); |
260 | return 0; | |
261 | } | |
262 | ||
35b7e476 CM |
263 | static int add_dirty_roots(struct btrfs_trans_handle *trans, |
264 | struct radix_tree_root *radix, | |
265 | struct list_head *list) | |
0f7d52f4 CM |
266 | { |
267 | struct dirty_root *dirty; | |
268 | struct btrfs_root *gang[8]; | |
269 | struct btrfs_root *root; | |
270 | int i; | |
271 | int ret; | |
54aa1f4d | 272 | int err = 0; |
5eda7b5e | 273 | u32 refs; |
54aa1f4d | 274 | |
0f7d52f4 CM |
275 | while(1) { |
276 | ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0, | |
277 | ARRAY_SIZE(gang), | |
278 | BTRFS_ROOT_TRANS_TAG); | |
279 | if (ret == 0) | |
280 | break; | |
281 | for (i = 0; i < ret; i++) { | |
282 | root = gang[i]; | |
2619ba1f CM |
283 | radix_tree_tag_clear(radix, |
284 | (unsigned long)root->root_key.objectid, | |
285 | BTRFS_ROOT_TRANS_TAG); | |
0f7d52f4 | 286 | if (root->commit_root == root->node) { |
5f39d397 | 287 | WARN_ON(extent_buffer_blocknr(root->node) != |
0f7d52f4 | 288 | btrfs_root_blocknr(&root->root_item)); |
5f39d397 | 289 | free_extent_buffer(root->commit_root); |
0f7d52f4 | 290 | root->commit_root = NULL; |
58176a96 JB |
291 | |
292 | /* make sure to update the root on disk | |
293 | * so we get any updates to the block used | |
294 | * counts | |
295 | */ | |
296 | err = btrfs_update_root(trans, | |
297 | root->fs_info->tree_root, | |
298 | &root->root_key, | |
299 | &root->root_item); | |
0f7d52f4 CM |
300 | continue; |
301 | } | |
302 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
303 | BUG_ON(!dirty); | |
9f3a7427 CM |
304 | dirty->root = kmalloc(sizeof(*dirty->root), GFP_NOFS); |
305 | BUG_ON(!dirty->root); | |
306 | ||
307 | memset(&root->root_item.drop_progress, 0, | |
308 | sizeof(struct btrfs_disk_key)); | |
309 | root->root_item.drop_level = 0; | |
310 | ||
311 | memcpy(dirty->root, root, sizeof(*root)); | |
312 | dirty->root->node = root->commit_root; | |
58176a96 | 313 | dirty->latest_root = root; |
0f7d52f4 | 314 | root->commit_root = NULL; |
5eda7b5e | 315 | |
0f7d52f4 CM |
316 | root->root_key.offset = root->fs_info->generation; |
317 | btrfs_set_root_blocknr(&root->root_item, | |
5f39d397 | 318 | extent_buffer_blocknr(root->node)); |
0f7d52f4 CM |
319 | err = btrfs_insert_root(trans, root->fs_info->tree_root, |
320 | &root->root_key, | |
321 | &root->root_item); | |
54aa1f4d CM |
322 | if (err) |
323 | break; | |
9f3a7427 CM |
324 | |
325 | refs = btrfs_root_refs(&dirty->root->root_item); | |
326 | btrfs_set_root_refs(&dirty->root->root_item, refs - 1); | |
5eda7b5e | 327 | err = btrfs_update_root(trans, root->fs_info->tree_root, |
9f3a7427 CM |
328 | &dirty->root->root_key, |
329 | &dirty->root->root_item); | |
5eda7b5e CM |
330 | |
331 | BUG_ON(err); | |
9f3a7427 | 332 | if (refs == 1) { |
5eda7b5e | 333 | list_add(&dirty->list, list); |
9f3a7427 CM |
334 | } else { |
335 | WARN_ON(1); | |
336 | kfree(dirty->root); | |
5eda7b5e | 337 | kfree(dirty); |
9f3a7427 | 338 | } |
0f7d52f4 CM |
339 | } |
340 | } | |
54aa1f4d | 341 | return err; |
0f7d52f4 CM |
342 | } |
343 | ||
e9d0b13b CM |
344 | int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) |
345 | { | |
346 | struct btrfs_fs_info *info = root->fs_info; | |
347 | int ret; | |
348 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 349 | unsigned long nr; |
e9d0b13b CM |
350 | |
351 | if (root->defrag_running) | |
352 | return 0; | |
353 | ||
354 | trans = btrfs_start_transaction(root, 1); | |
f510cfec | 355 | while (0) { |
e9d0b13b CM |
356 | root->defrag_running = 1; |
357 | ret = btrfs_defrag_leaves(trans, root, cacheonly); | |
d3c2fdcf | 358 | nr = trans->blocks_used; |
e9d0b13b CM |
359 | btrfs_end_transaction(trans, root); |
360 | mutex_unlock(&info->fs_mutex); | |
361 | ||
d3c2fdcf | 362 | btrfs_btree_balance_dirty(info->tree_root, nr); |
e9d0b13b CM |
363 | cond_resched(); |
364 | ||
365 | mutex_lock(&info->fs_mutex); | |
366 | trans = btrfs_start_transaction(root, 1); | |
367 | if (ret != -EAGAIN) | |
368 | break; | |
369 | } | |
370 | root->defrag_running = 0; | |
371 | radix_tree_tag_clear(&info->fs_roots_radix, | |
372 | (unsigned long)root->root_key.objectid, | |
373 | BTRFS_ROOT_DEFRAG_TAG); | |
374 | btrfs_end_transaction(trans, root); | |
375 | return 0; | |
376 | } | |
377 | ||
6702ed49 CM |
378 | int btrfs_defrag_dirty_roots(struct btrfs_fs_info *info) |
379 | { | |
380 | struct btrfs_root *gang[1]; | |
381 | struct btrfs_root *root; | |
6702ed49 CM |
382 | int i; |
383 | int ret; | |
384 | int err = 0; | |
385 | u64 last = 0; | |
386 | ||
6702ed49 CM |
387 | while(1) { |
388 | ret = radix_tree_gang_lookup_tag(&info->fs_roots_radix, | |
389 | (void **)gang, last, | |
390 | ARRAY_SIZE(gang), | |
391 | BTRFS_ROOT_DEFRAG_TAG); | |
392 | if (ret == 0) | |
393 | break; | |
394 | for (i = 0; i < ret; i++) { | |
395 | root = gang[i]; | |
396 | last = root->root_key.objectid + 1; | |
f510cfec | 397 | btrfs_defrag_root(root, 1); |
6702ed49 CM |
398 | } |
399 | } | |
5f39d397 | 400 | // btrfs_defrag_root(info->extent_root, 1); |
6702ed49 CM |
401 | return err; |
402 | } | |
403 | ||
35b7e476 CM |
404 | static int drop_dirty_roots(struct btrfs_root *tree_root, |
405 | struct list_head *list) | |
0f7d52f4 CM |
406 | { |
407 | struct dirty_root *dirty; | |
408 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 409 | unsigned long nr; |
58176a96 JB |
410 | u64 num_blocks; |
411 | u64 blocks_used; | |
54aa1f4d | 412 | int ret = 0; |
9f3a7427 CM |
413 | int err; |
414 | ||
0f7d52f4 | 415 | while(!list_empty(list)) { |
58176a96 JB |
416 | struct btrfs_root *root; |
417 | ||
facda1e7 | 418 | mutex_lock(&tree_root->fs_info->fs_mutex); |
0f7d52f4 CM |
419 | dirty = list_entry(list->next, struct dirty_root, list); |
420 | list_del_init(&dirty->list); | |
5eda7b5e | 421 | |
5f39d397 | 422 | num_blocks = btrfs_root_used(&dirty->root->root_item); |
58176a96 JB |
423 | root = dirty->latest_root; |
424 | ||
9f3a7427 CM |
425 | while(1) { |
426 | trans = btrfs_start_transaction(tree_root, 1); | |
427 | ret = btrfs_drop_snapshot(trans, dirty->root); | |
428 | if (ret != -EAGAIN) { | |
429 | break; | |
430 | } | |
58176a96 | 431 | |
9f3a7427 CM |
432 | err = btrfs_update_root(trans, |
433 | tree_root, | |
434 | &dirty->root->root_key, | |
435 | &dirty->root->root_item); | |
436 | if (err) | |
437 | ret = err; | |
d3c2fdcf | 438 | nr = trans->blocks_used; |
9f3a7427 CM |
439 | ret = btrfs_end_transaction(trans, tree_root); |
440 | BUG_ON(ret); | |
f4468e94 | 441 | mutex_unlock(&tree_root->fs_info->fs_mutex); |
d3c2fdcf | 442 | btrfs_btree_balance_dirty(tree_root, nr); |
f4468e94 CM |
443 | schedule(); |
444 | ||
445 | mutex_lock(&tree_root->fs_info->fs_mutex); | |
9f3a7427 | 446 | } |
0f7d52f4 | 447 | BUG_ON(ret); |
58176a96 | 448 | |
5f39d397 CM |
449 | num_blocks -= btrfs_root_used(&dirty->root->root_item); |
450 | blocks_used = btrfs_root_used(&root->root_item); | |
58176a96 JB |
451 | if (num_blocks) { |
452 | record_root_in_trans(root); | |
5f39d397 | 453 | btrfs_set_root_used(&root->root_item, |
58176a96 JB |
454 | blocks_used - num_blocks); |
455 | } | |
9f3a7427 | 456 | ret = btrfs_del_root(trans, tree_root, &dirty->root->root_key); |
58176a96 JB |
457 | if (ret) { |
458 | BUG(); | |
54aa1f4d | 459 | break; |
58176a96 | 460 | } |
d3c2fdcf | 461 | nr = trans->blocks_used; |
0f7d52f4 CM |
462 | ret = btrfs_end_transaction(trans, tree_root); |
463 | BUG_ON(ret); | |
5eda7b5e | 464 | |
f510cfec | 465 | free_extent_buffer(dirty->root->node); |
9f3a7427 | 466 | kfree(dirty->root); |
0f7d52f4 | 467 | kfree(dirty); |
facda1e7 | 468 | mutex_unlock(&tree_root->fs_info->fs_mutex); |
d3c2fdcf CM |
469 | |
470 | btrfs_btree_balance_dirty(tree_root, nr); | |
f4468e94 | 471 | schedule(); |
0f7d52f4 | 472 | } |
54aa1f4d | 473 | return ret; |
0f7d52f4 CM |
474 | } |
475 | ||
79154b1b CM |
476 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
477 | struct btrfs_root *root) | |
478 | { | |
15ee9bc7 JB |
479 | unsigned long joined = 0; |
480 | unsigned long timeout = 1; | |
79154b1b | 481 | struct btrfs_transaction *cur_trans; |
8fd17795 | 482 | struct btrfs_transaction *prev_trans = NULL; |
0f7d52f4 | 483 | struct list_head dirty_fs_roots; |
1a5bc167 | 484 | struct extent_map_tree pinned_copy; |
79154b1b | 485 | DEFINE_WAIT(wait); |
15ee9bc7 | 486 | int ret; |
79154b1b | 487 | |
1a5bc167 CM |
488 | extent_map_tree_init(&pinned_copy, |
489 | root->fs_info->btree_inode->i_mapping, GFP_NOFS); | |
0f7d52f4 | 490 | INIT_LIST_HEAD(&dirty_fs_roots); |
d6e4a428 | 491 | |
79154b1b CM |
492 | mutex_lock(&root->fs_info->trans_mutex); |
493 | if (trans->transaction->in_commit) { | |
494 | cur_trans = trans->transaction; | |
495 | trans->transaction->use_count++; | |
ccd467d6 | 496 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b | 497 | btrfs_end_transaction(trans, root); |
ccd467d6 CM |
498 | |
499 | mutex_unlock(&root->fs_info->fs_mutex); | |
79154b1b CM |
500 | ret = wait_for_commit(root, cur_trans); |
501 | BUG_ON(ret); | |
15ee9bc7 JB |
502 | |
503 | mutex_lock(&root->fs_info->trans_mutex); | |
79154b1b | 504 | put_transaction(cur_trans); |
15ee9bc7 JB |
505 | mutex_unlock(&root->fs_info->trans_mutex); |
506 | ||
ccd467d6 | 507 | mutex_lock(&root->fs_info->fs_mutex); |
79154b1b CM |
508 | return 0; |
509 | } | |
2c90e5d6 | 510 | trans->transaction->in_commit = 1; |
ccd467d6 CM |
511 | cur_trans = trans->transaction; |
512 | if (cur_trans->list.prev != &root->fs_info->trans_list) { | |
513 | prev_trans = list_entry(cur_trans->list.prev, | |
514 | struct btrfs_transaction, list); | |
515 | if (!prev_trans->commit_done) { | |
516 | prev_trans->use_count++; | |
517 | mutex_unlock(&root->fs_info->fs_mutex); | |
518 | mutex_unlock(&root->fs_info->trans_mutex); | |
519 | ||
520 | wait_for_commit(root, prev_trans); | |
ccd467d6 CM |
521 | |
522 | mutex_lock(&root->fs_info->fs_mutex); | |
523 | mutex_lock(&root->fs_info->trans_mutex); | |
15ee9bc7 | 524 | put_transaction(prev_trans); |
ccd467d6 CM |
525 | } |
526 | } | |
15ee9bc7 JB |
527 | |
528 | do { | |
529 | joined = cur_trans->num_joined; | |
2c90e5d6 | 530 | WARN_ON(cur_trans != trans->transaction); |
15ee9bc7 | 531 | prepare_to_wait(&cur_trans->writer_wait, &wait, |
79154b1b | 532 | TASK_UNINTERRUPTIBLE); |
15ee9bc7 JB |
533 | |
534 | if (cur_trans->num_writers > 1) | |
535 | timeout = MAX_SCHEDULE_TIMEOUT; | |
536 | else | |
537 | timeout = 1; | |
538 | ||
ccd467d6 | 539 | mutex_unlock(&root->fs_info->fs_mutex); |
79154b1b | 540 | mutex_unlock(&root->fs_info->trans_mutex); |
15ee9bc7 JB |
541 | |
542 | schedule_timeout(timeout); | |
543 | ||
ccd467d6 | 544 | mutex_lock(&root->fs_info->fs_mutex); |
79154b1b | 545 | mutex_lock(&root->fs_info->trans_mutex); |
15ee9bc7 JB |
546 | finish_wait(&cur_trans->writer_wait, &wait); |
547 | } while (cur_trans->num_writers > 1 || | |
548 | (cur_trans->num_joined != joined)); | |
549 | ||
2c90e5d6 | 550 | WARN_ON(cur_trans != trans->transaction); |
54aa1f4d CM |
551 | ret = add_dirty_roots(trans, &root->fs_info->fs_roots_radix, |
552 | &dirty_fs_roots); | |
553 | BUG_ON(ret); | |
554 | ||
79154b1b CM |
555 | ret = btrfs_commit_tree_roots(trans, root); |
556 | BUG_ON(ret); | |
54aa1f4d | 557 | |
78fae27e CM |
558 | cur_trans = root->fs_info->running_transaction; |
559 | root->fs_info->running_transaction = NULL; | |
4b52dff6 CM |
560 | btrfs_set_super_generation(&root->fs_info->super_copy, |
561 | cur_trans->transid); | |
562 | btrfs_set_super_root(&root->fs_info->super_copy, | |
5f39d397 CM |
563 | extent_buffer_blocknr(root->fs_info->tree_root->node)); |
564 | ||
565 | write_extent_buffer(root->fs_info->sb_buffer, | |
566 | &root->fs_info->super_copy, 0, | |
567 | sizeof(root->fs_info->super_copy)); | |
ccd467d6 CM |
568 | |
569 | btrfs_copy_pinned(root, &pinned_copy); | |
570 | ||
78fae27e | 571 | mutex_unlock(&root->fs_info->trans_mutex); |
8fd17795 | 572 | mutex_unlock(&root->fs_info->fs_mutex); |
79154b1b CM |
573 | ret = btrfs_write_and_wait_transaction(trans, root); |
574 | BUG_ON(ret); | |
79154b1b | 575 | write_ctree_super(trans, root); |
8fd17795 | 576 | mutex_lock(&root->fs_info->fs_mutex); |
ccd467d6 | 577 | btrfs_finish_extent_commit(trans, root, &pinned_copy); |
78fae27e | 578 | mutex_lock(&root->fs_info->trans_mutex); |
2c90e5d6 | 579 | cur_trans->commit_done = 1; |
15ee9bc7 | 580 | root->fs_info->last_trans_committed = cur_trans->transid; |
2c90e5d6 | 581 | wake_up(&cur_trans->commit_wait); |
78fae27e | 582 | put_transaction(cur_trans); |
79154b1b | 583 | put_transaction(cur_trans); |
58176a96 | 584 | |
facda1e7 CM |
585 | if (root->fs_info->closing) |
586 | list_splice_init(&root->fs_info->dead_roots, &dirty_fs_roots); | |
587 | else | |
588 | list_splice_init(&dirty_fs_roots, &root->fs_info->dead_roots); | |
58176a96 | 589 | |
78fae27e | 590 | mutex_unlock(&root->fs_info->trans_mutex); |
2c90e5d6 | 591 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b | 592 | |
facda1e7 CM |
593 | if (root->fs_info->closing) { |
594 | mutex_unlock(&root->fs_info->fs_mutex); | |
595 | drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots); | |
596 | mutex_lock(&root->fs_info->fs_mutex); | |
597 | } | |
79154b1b CM |
598 | return ret; |
599 | } | |
600 | ||
e9d0b13b CM |
601 | int btrfs_clean_old_snapshots(struct btrfs_root *root) |
602 | { | |
603 | struct list_head dirty_roots; | |
604 | INIT_LIST_HEAD(&dirty_roots); | |
605 | ||
606 | mutex_lock(&root->fs_info->trans_mutex); | |
607 | list_splice_init(&root->fs_info->dead_roots, &dirty_roots); | |
608 | mutex_unlock(&root->fs_info->trans_mutex); | |
609 | ||
610 | if (!list_empty(&dirty_roots)) { | |
611 | drop_dirty_roots(root, &dirty_roots); | |
612 | } | |
613 | return 0; | |
614 | } | |
08607c1b CM |
615 | void btrfs_transaction_cleaner(struct work_struct *work) |
616 | { | |
617 | struct btrfs_fs_info *fs_info = container_of(work, | |
618 | struct btrfs_fs_info, | |
619 | trans_work.work); | |
620 | ||
621 | struct btrfs_root *root = fs_info->tree_root; | |
622 | struct btrfs_transaction *cur; | |
623 | struct btrfs_trans_handle *trans; | |
624 | unsigned long now; | |
625 | unsigned long delay = HZ * 30; | |
626 | int ret; | |
627 | ||
08607c1b CM |
628 | mutex_lock(&root->fs_info->fs_mutex); |
629 | mutex_lock(&root->fs_info->trans_mutex); | |
630 | cur = root->fs_info->running_transaction; | |
631 | if (!cur) { | |
632 | mutex_unlock(&root->fs_info->trans_mutex); | |
633 | goto out; | |
634 | } | |
635 | now = get_seconds(); | |
636 | if (now < cur->start_time || now - cur->start_time < 30) { | |
637 | mutex_unlock(&root->fs_info->trans_mutex); | |
638 | delay = HZ * 5; | |
639 | goto out; | |
640 | } | |
641 | mutex_unlock(&root->fs_info->trans_mutex); | |
6702ed49 | 642 | btrfs_defrag_dirty_roots(root->fs_info); |
08607c1b CM |
643 | trans = btrfs_start_transaction(root, 1); |
644 | ret = btrfs_commit_transaction(trans, root); | |
645 | out: | |
646 | mutex_unlock(&root->fs_info->fs_mutex); | |
e9d0b13b | 647 | btrfs_clean_old_snapshots(root); |
08607c1b CM |
648 | btrfs_transaction_queue_work(root, delay); |
649 | } | |
650 | ||
651 | void btrfs_transaction_queue_work(struct btrfs_root *root, int delay) | |
652 | { | |
653 | queue_delayed_work(trans_wq, &root->fs_info->trans_work, delay); | |
654 | } | |
655 | ||
656 | void btrfs_transaction_flush_work(struct btrfs_root *root) | |
657 | { | |
658 | cancel_rearming_delayed_workqueue(trans_wq, &root->fs_info->trans_work); | |
659 | flush_workqueue(trans_wq); | |
660 | } | |
661 | ||
662 | void __init btrfs_init_transaction_sys(void) | |
663 | { | |
664 | trans_wq = create_workqueue("btrfs"); | |
665 | } | |
666 | ||
667 | void __exit btrfs_exit_transaction_sys(void) | |
668 | { | |
669 | destroy_workqueue(trans_wq); | |
670 | } | |
671 |