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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(); |
3063d29f | 69 | INIT_LIST_HEAD(&cur_trans->pending_snapshots); |
8fd17795 | 70 | list_add_tail(&cur_trans->list, &root->fs_info->trans_list); |
dc17ff8f | 71 | btrfs_ordered_inode_tree_init(&cur_trans->ordered_inode_tree); |
5f39d397 CM |
72 | extent_map_tree_init(&cur_trans->dirty_pages, |
73 | root->fs_info->btree_inode->i_mapping, | |
74 | GFP_NOFS); | |
15ee9bc7 JB |
75 | } else { |
76 | cur_trans->num_writers++; | |
77 | cur_trans->num_joined++; | |
79154b1b | 78 | } |
15ee9bc7 | 79 | |
79154b1b CM |
80 | return 0; |
81 | } | |
82 | ||
6702ed49 CM |
83 | static int record_root_in_trans(struct btrfs_root *root) |
84 | { | |
85 | u64 running_trans_id = root->fs_info->running_transaction->transid; | |
86 | if (root->ref_cows && root->last_trans < running_trans_id) { | |
87 | WARN_ON(root == root->fs_info->extent_root); | |
88 | if (root->root_item.refs != 0) { | |
89 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, | |
90 | (unsigned long)root->root_key.objectid, | |
91 | BTRFS_ROOT_TRANS_TAG); | |
92 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, | |
93 | (unsigned long)root->root_key.objectid, | |
94 | BTRFS_ROOT_DEFRAG_TAG); | |
95 | root->commit_root = root->node; | |
5f39d397 | 96 | extent_buffer_get(root->node); |
6702ed49 CM |
97 | } else { |
98 | WARN_ON(1); | |
99 | } | |
100 | root->last_trans = running_trans_id; | |
101 | } | |
102 | return 0; | |
103 | } | |
104 | ||
79154b1b CM |
105 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
106 | int num_blocks) | |
107 | { | |
2c90e5d6 CM |
108 | struct btrfs_trans_handle *h = |
109 | kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); | |
79154b1b CM |
110 | int ret; |
111 | ||
112 | mutex_lock(&root->fs_info->trans_mutex); | |
113 | ret = join_transaction(root); | |
114 | BUG_ON(ret); | |
0f7d52f4 | 115 | |
6702ed49 CM |
116 | record_root_in_trans(root); |
117 | h->transid = root->fs_info->running_transaction->transid; | |
79154b1b CM |
118 | h->transaction = root->fs_info->running_transaction; |
119 | h->blocks_reserved = num_blocks; | |
120 | h->blocks_used = 0; | |
31f3c99b | 121 | h->block_group = NULL; |
26b8003f CM |
122 | h->alloc_exclude_nr = 0; |
123 | h->alloc_exclude_start = 0; | |
79154b1b CM |
124 | root->fs_info->running_transaction->use_count++; |
125 | mutex_unlock(&root->fs_info->trans_mutex); | |
126 | return h; | |
127 | } | |
128 | ||
129 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, | |
130 | struct btrfs_root *root) | |
131 | { | |
132 | struct btrfs_transaction *cur_trans; | |
d6e4a428 | 133 | |
79154b1b CM |
134 | mutex_lock(&root->fs_info->trans_mutex); |
135 | cur_trans = root->fs_info->running_transaction; | |
ccd467d6 | 136 | WARN_ON(cur_trans != trans->transaction); |
d5719762 | 137 | WARN_ON(cur_trans->num_writers < 1); |
ccd467d6 | 138 | cur_trans->num_writers--; |
79154b1b CM |
139 | if (waitqueue_active(&cur_trans->writer_wait)) |
140 | wake_up(&cur_trans->writer_wait); | |
79154b1b CM |
141 | put_transaction(cur_trans); |
142 | mutex_unlock(&root->fs_info->trans_mutex); | |
d6025579 | 143 | memset(trans, 0, sizeof(*trans)); |
2c90e5d6 | 144 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b CM |
145 | return 0; |
146 | } | |
147 | ||
148 | ||
149 | int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, | |
150 | struct btrfs_root *root) | |
151 | { | |
7c4452b9 | 152 | int ret; |
7c4452b9 CM |
153 | int err; |
154 | int werr = 0; | |
5f39d397 | 155 | struct extent_map_tree *dirty_pages; |
7c4452b9 | 156 | struct page *page; |
7c4452b9 | 157 | struct inode *btree_inode = root->fs_info->btree_inode; |
5f39d397 CM |
158 | u64 start; |
159 | u64 end; | |
160 | unsigned long index; | |
7c4452b9 CM |
161 | |
162 | if (!trans || !trans->transaction) { | |
163 | return filemap_write_and_wait(btree_inode->i_mapping); | |
164 | } | |
165 | dirty_pages = &trans->transaction->dirty_pages; | |
166 | while(1) { | |
5f39d397 CM |
167 | ret = find_first_extent_bit(dirty_pages, 0, &start, &end, |
168 | EXTENT_DIRTY); | |
169 | if (ret) | |
7c4452b9 | 170 | break; |
5f39d397 CM |
171 | clear_extent_dirty(dirty_pages, start, end, GFP_NOFS); |
172 | while(start <= end) { | |
173 | index = start >> PAGE_CACHE_SHIFT; | |
35ebb934 | 174 | start = (u64)(index + 1) << PAGE_CACHE_SHIFT; |
5f39d397 | 175 | page = find_lock_page(btree_inode->i_mapping, index); |
7c4452b9 CM |
176 | if (!page) |
177 | continue; | |
6702ed49 CM |
178 | if (PageWriteback(page)) { |
179 | if (PageDirty(page)) | |
180 | wait_on_page_writeback(page); | |
181 | else { | |
182 | unlock_page(page); | |
183 | page_cache_release(page); | |
184 | continue; | |
185 | } | |
186 | } | |
7c4452b9 CM |
187 | err = write_one_page(page, 0); |
188 | if (err) | |
189 | werr = err; | |
190 | page_cache_release(page); | |
191 | } | |
192 | } | |
193 | err = filemap_fdatawait(btree_inode->i_mapping); | |
194 | if (err) | |
195 | werr = err; | |
196 | return werr; | |
79154b1b CM |
197 | } |
198 | ||
199 | int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans, | |
200 | struct btrfs_root *root) | |
201 | { | |
202 | int ret; | |
203 | u64 old_extent_block; | |
204 | struct btrfs_fs_info *fs_info = root->fs_info; | |
205 | struct btrfs_root *tree_root = fs_info->tree_root; | |
206 | struct btrfs_root *extent_root = fs_info->extent_root; | |
79154b1b | 207 | |
9078a3e1 | 208 | btrfs_write_dirty_block_groups(trans, extent_root); |
79154b1b | 209 | while(1) { |
db94535d CM |
210 | old_extent_block = btrfs_root_bytenr(&extent_root->root_item); |
211 | if (old_extent_block == extent_root->node->start) | |
79154b1b | 212 | break; |
db94535d CM |
213 | btrfs_set_root_bytenr(&extent_root->root_item, |
214 | extent_root->node->start); | |
215 | btrfs_set_root_level(&extent_root->root_item, | |
216 | btrfs_header_level(extent_root->node)); | |
79154b1b CM |
217 | ret = btrfs_update_root(trans, tree_root, |
218 | &extent_root->root_key, | |
219 | &extent_root->root_item); | |
220 | BUG_ON(ret); | |
9078a3e1 | 221 | btrfs_write_dirty_block_groups(trans, extent_root); |
79154b1b CM |
222 | } |
223 | return 0; | |
224 | } | |
225 | ||
226 | static int wait_for_commit(struct btrfs_root *root, | |
227 | struct btrfs_transaction *commit) | |
228 | { | |
229 | DEFINE_WAIT(wait); | |
ccd467d6 | 230 | mutex_lock(&root->fs_info->trans_mutex); |
79154b1b CM |
231 | while(!commit->commit_done) { |
232 | prepare_to_wait(&commit->commit_wait, &wait, | |
233 | TASK_UNINTERRUPTIBLE); | |
234 | if (commit->commit_done) | |
235 | break; | |
236 | mutex_unlock(&root->fs_info->trans_mutex); | |
237 | schedule(); | |
238 | mutex_lock(&root->fs_info->trans_mutex); | |
239 | } | |
ccd467d6 | 240 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b CM |
241 | finish_wait(&commit->commit_wait, &wait); |
242 | return 0; | |
243 | } | |
244 | ||
0f7d52f4 CM |
245 | struct dirty_root { |
246 | struct list_head list; | |
0f7d52f4 | 247 | struct btrfs_root *root; |
58176a96 | 248 | struct btrfs_root *latest_root; |
0f7d52f4 CM |
249 | }; |
250 | ||
5ce14bbc CM |
251 | int btrfs_add_dead_root(struct btrfs_root *root, |
252 | struct btrfs_root *latest, | |
253 | struct list_head *dead_list) | |
5eda7b5e CM |
254 | { |
255 | struct dirty_root *dirty; | |
256 | ||
257 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
258 | if (!dirty) | |
259 | return -ENOMEM; | |
5eda7b5e | 260 | dirty->root = root; |
5ce14bbc | 261 | dirty->latest_root = latest; |
5eda7b5e CM |
262 | list_add(&dirty->list, dead_list); |
263 | return 0; | |
264 | } | |
265 | ||
35b7e476 CM |
266 | static int add_dirty_roots(struct btrfs_trans_handle *trans, |
267 | struct radix_tree_root *radix, | |
268 | struct list_head *list) | |
0f7d52f4 CM |
269 | { |
270 | struct dirty_root *dirty; | |
271 | struct btrfs_root *gang[8]; | |
272 | struct btrfs_root *root; | |
273 | int i; | |
274 | int ret; | |
54aa1f4d | 275 | int err = 0; |
5eda7b5e | 276 | u32 refs; |
54aa1f4d | 277 | |
0f7d52f4 CM |
278 | while(1) { |
279 | ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0, | |
280 | ARRAY_SIZE(gang), | |
281 | BTRFS_ROOT_TRANS_TAG); | |
282 | if (ret == 0) | |
283 | break; | |
284 | for (i = 0; i < ret; i++) { | |
285 | root = gang[i]; | |
2619ba1f CM |
286 | radix_tree_tag_clear(radix, |
287 | (unsigned long)root->root_key.objectid, | |
288 | BTRFS_ROOT_TRANS_TAG); | |
0f7d52f4 | 289 | if (root->commit_root == root->node) { |
db94535d CM |
290 | WARN_ON(root->node->start != |
291 | btrfs_root_bytenr(&root->root_item)); | |
5f39d397 | 292 | free_extent_buffer(root->commit_root); |
0f7d52f4 | 293 | root->commit_root = NULL; |
58176a96 JB |
294 | |
295 | /* make sure to update the root on disk | |
296 | * so we get any updates to the block used | |
297 | * counts | |
298 | */ | |
299 | err = btrfs_update_root(trans, | |
300 | root->fs_info->tree_root, | |
301 | &root->root_key, | |
302 | &root->root_item); | |
0f7d52f4 CM |
303 | continue; |
304 | } | |
305 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
306 | BUG_ON(!dirty); | |
9f3a7427 CM |
307 | dirty->root = kmalloc(sizeof(*dirty->root), GFP_NOFS); |
308 | BUG_ON(!dirty->root); | |
309 | ||
310 | memset(&root->root_item.drop_progress, 0, | |
311 | sizeof(struct btrfs_disk_key)); | |
312 | root->root_item.drop_level = 0; | |
313 | ||
314 | memcpy(dirty->root, root, sizeof(*root)); | |
315 | dirty->root->node = root->commit_root; | |
58176a96 | 316 | dirty->latest_root = root; |
0f7d52f4 | 317 | root->commit_root = NULL; |
5eda7b5e | 318 | |
0f7d52f4 | 319 | root->root_key.offset = root->fs_info->generation; |
db94535d CM |
320 | btrfs_set_root_bytenr(&root->root_item, |
321 | root->node->start); | |
322 | btrfs_set_root_level(&root->root_item, | |
323 | btrfs_header_level(root->node)); | |
0f7d52f4 CM |
324 | err = btrfs_insert_root(trans, root->fs_info->tree_root, |
325 | &root->root_key, | |
326 | &root->root_item); | |
54aa1f4d CM |
327 | if (err) |
328 | break; | |
9f3a7427 CM |
329 | |
330 | refs = btrfs_root_refs(&dirty->root->root_item); | |
331 | btrfs_set_root_refs(&dirty->root->root_item, refs - 1); | |
5eda7b5e | 332 | err = btrfs_update_root(trans, root->fs_info->tree_root, |
9f3a7427 CM |
333 | &dirty->root->root_key, |
334 | &dirty->root->root_item); | |
5eda7b5e CM |
335 | |
336 | BUG_ON(err); | |
9f3a7427 | 337 | if (refs == 1) { |
5eda7b5e | 338 | list_add(&dirty->list, list); |
9f3a7427 CM |
339 | } else { |
340 | WARN_ON(1); | |
341 | kfree(dirty->root); | |
5eda7b5e | 342 | kfree(dirty); |
9f3a7427 | 343 | } |
0f7d52f4 CM |
344 | } |
345 | } | |
54aa1f4d | 346 | return err; |
0f7d52f4 CM |
347 | } |
348 | ||
e9d0b13b CM |
349 | int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) |
350 | { | |
351 | struct btrfs_fs_info *info = root->fs_info; | |
352 | int ret; | |
353 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 354 | unsigned long nr; |
e9d0b13b CM |
355 | |
356 | if (root->defrag_running) | |
357 | return 0; | |
e9d0b13b | 358 | trans = btrfs_start_transaction(root, 1); |
6b80053d | 359 | while (1) { |
e9d0b13b CM |
360 | root->defrag_running = 1; |
361 | ret = btrfs_defrag_leaves(trans, root, cacheonly); | |
d3c2fdcf | 362 | nr = trans->blocks_used; |
e9d0b13b CM |
363 | btrfs_end_transaction(trans, root); |
364 | mutex_unlock(&info->fs_mutex); | |
d3c2fdcf | 365 | btrfs_btree_balance_dirty(info->tree_root, nr); |
e9d0b13b CM |
366 | cond_resched(); |
367 | ||
368 | mutex_lock(&info->fs_mutex); | |
369 | trans = btrfs_start_transaction(root, 1); | |
370 | if (ret != -EAGAIN) | |
371 | break; | |
372 | } | |
373 | root->defrag_running = 0; | |
374 | radix_tree_tag_clear(&info->fs_roots_radix, | |
375 | (unsigned long)root->root_key.objectid, | |
376 | BTRFS_ROOT_DEFRAG_TAG); | |
377 | btrfs_end_transaction(trans, root); | |
378 | return 0; | |
379 | } | |
380 | ||
6702ed49 CM |
381 | int btrfs_defrag_dirty_roots(struct btrfs_fs_info *info) |
382 | { | |
383 | struct btrfs_root *gang[1]; | |
384 | struct btrfs_root *root; | |
6702ed49 CM |
385 | int i; |
386 | int ret; | |
387 | int err = 0; | |
388 | u64 last = 0; | |
389 | ||
6702ed49 CM |
390 | while(1) { |
391 | ret = radix_tree_gang_lookup_tag(&info->fs_roots_radix, | |
392 | (void **)gang, last, | |
393 | ARRAY_SIZE(gang), | |
394 | BTRFS_ROOT_DEFRAG_TAG); | |
395 | if (ret == 0) | |
396 | break; | |
397 | for (i = 0; i < ret; i++) { | |
398 | root = gang[i]; | |
399 | last = root->root_key.objectid + 1; | |
f510cfec | 400 | btrfs_defrag_root(root, 1); |
6702ed49 CM |
401 | } |
402 | } | |
6b80053d | 403 | btrfs_defrag_root(info->extent_root, 1); |
6702ed49 CM |
404 | return err; |
405 | } | |
406 | ||
35b7e476 CM |
407 | static int drop_dirty_roots(struct btrfs_root *tree_root, |
408 | struct list_head *list) | |
0f7d52f4 CM |
409 | { |
410 | struct dirty_root *dirty; | |
411 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 412 | unsigned long nr; |
db94535d CM |
413 | u64 num_bytes; |
414 | u64 bytes_used; | |
54aa1f4d | 415 | int ret = 0; |
9f3a7427 CM |
416 | int err; |
417 | ||
0f7d52f4 | 418 | while(!list_empty(list)) { |
58176a96 JB |
419 | struct btrfs_root *root; |
420 | ||
facda1e7 | 421 | mutex_lock(&tree_root->fs_info->fs_mutex); |
0f7d52f4 CM |
422 | dirty = list_entry(list->next, struct dirty_root, list); |
423 | list_del_init(&dirty->list); | |
5eda7b5e | 424 | |
db94535d | 425 | num_bytes = btrfs_root_used(&dirty->root->root_item); |
58176a96 | 426 | root = dirty->latest_root; |
e2008b61 | 427 | root->fs_info->throttles++; |
58176a96 | 428 | |
9f3a7427 CM |
429 | while(1) { |
430 | trans = btrfs_start_transaction(tree_root, 1); | |
431 | ret = btrfs_drop_snapshot(trans, dirty->root); | |
432 | if (ret != -EAGAIN) { | |
433 | break; | |
434 | } | |
58176a96 | 435 | |
9f3a7427 CM |
436 | err = btrfs_update_root(trans, |
437 | tree_root, | |
438 | &dirty->root->root_key, | |
439 | &dirty->root->root_item); | |
440 | if (err) | |
441 | ret = err; | |
d3c2fdcf | 442 | nr = trans->blocks_used; |
9f3a7427 CM |
443 | ret = btrfs_end_transaction(trans, tree_root); |
444 | BUG_ON(ret); | |
f4468e94 | 445 | mutex_unlock(&tree_root->fs_info->fs_mutex); |
d3c2fdcf | 446 | btrfs_btree_balance_dirty(tree_root, nr); |
4dc11904 | 447 | cond_resched(); |
f4468e94 | 448 | mutex_lock(&tree_root->fs_info->fs_mutex); |
9f3a7427 | 449 | } |
0f7d52f4 | 450 | BUG_ON(ret); |
e2008b61 | 451 | root->fs_info->throttles--; |
58176a96 | 452 | |
db94535d CM |
453 | num_bytes -= btrfs_root_used(&dirty->root->root_item); |
454 | bytes_used = btrfs_root_used(&root->root_item); | |
455 | if (num_bytes) { | |
58176a96 | 456 | record_root_in_trans(root); |
5f39d397 | 457 | btrfs_set_root_used(&root->root_item, |
db94535d | 458 | bytes_used - num_bytes); |
58176a96 | 459 | } |
9f3a7427 | 460 | ret = btrfs_del_root(trans, tree_root, &dirty->root->root_key); |
58176a96 JB |
461 | if (ret) { |
462 | BUG(); | |
54aa1f4d | 463 | break; |
58176a96 | 464 | } |
d3c2fdcf | 465 | nr = trans->blocks_used; |
0f7d52f4 CM |
466 | ret = btrfs_end_transaction(trans, tree_root); |
467 | BUG_ON(ret); | |
5eda7b5e | 468 | |
f510cfec | 469 | free_extent_buffer(dirty->root->node); |
9f3a7427 | 470 | kfree(dirty->root); |
0f7d52f4 | 471 | kfree(dirty); |
facda1e7 | 472 | mutex_unlock(&tree_root->fs_info->fs_mutex); |
d3c2fdcf CM |
473 | |
474 | btrfs_btree_balance_dirty(tree_root, nr); | |
4dc11904 | 475 | cond_resched(); |
0f7d52f4 | 476 | } |
54aa1f4d | 477 | return ret; |
0f7d52f4 CM |
478 | } |
479 | ||
dc17ff8f CM |
480 | int btrfs_write_ordered_inodes(struct btrfs_trans_handle *trans, |
481 | struct btrfs_root *root) | |
482 | { | |
483 | struct btrfs_transaction *cur_trans = trans->transaction; | |
484 | struct inode *inode; | |
485 | u64 root_objectid = 0; | |
486 | u64 objectid = 0; | |
dc17ff8f CM |
487 | int ret; |
488 | ||
e2008b61 | 489 | root->fs_info->throttles++; |
dc17ff8f CM |
490 | while(1) { |
491 | ret = btrfs_find_first_ordered_inode( | |
492 | &cur_trans->ordered_inode_tree, | |
4d5e74bc | 493 | &root_objectid, &objectid, &inode); |
dc17ff8f CM |
494 | if (!ret) |
495 | break; | |
496 | ||
497 | mutex_unlock(&root->fs_info->trans_mutex); | |
498 | mutex_unlock(&root->fs_info->fs_mutex); | |
4d5e74bc CM |
499 | |
500 | if (S_ISREG(inode->i_mode)) | |
501 | filemap_fdatawrite(inode->i_mapping); | |
502 | iput(inode); | |
503 | ||
dc17ff8f CM |
504 | mutex_lock(&root->fs_info->fs_mutex); |
505 | mutex_lock(&root->fs_info->trans_mutex); | |
506 | } | |
507 | while(1) { | |
508 | root_objectid = 0; | |
509 | objectid = 0; | |
510 | ret = btrfs_find_del_first_ordered_inode( | |
511 | &cur_trans->ordered_inode_tree, | |
4d5e74bc | 512 | &root_objectid, &objectid, &inode); |
dc17ff8f CM |
513 | if (!ret) |
514 | break; | |
515 | mutex_unlock(&root->fs_info->trans_mutex); | |
516 | mutex_unlock(&root->fs_info->fs_mutex); | |
4d5e74bc CM |
517 | |
518 | if (S_ISREG(inode->i_mode)) | |
519 | filemap_write_and_wait(inode->i_mapping); | |
520 | atomic_dec(&inode->i_count); | |
521 | iput(inode); | |
522 | ||
dc17ff8f CM |
523 | mutex_lock(&root->fs_info->fs_mutex); |
524 | mutex_lock(&root->fs_info->trans_mutex); | |
525 | } | |
e2008b61 | 526 | root->fs_info->throttles--; |
3063d29f CM |
527 | return 0; |
528 | } | |
529 | ||
530 | static int create_pending_snapshot(struct btrfs_trans_handle *trans, | |
531 | struct btrfs_fs_info *fs_info, | |
532 | struct btrfs_pending_snapshot *pending) | |
533 | { | |
534 | struct btrfs_key key; | |
535 | struct btrfs_root_item new_root_item; | |
536 | struct btrfs_root *tree_root = fs_info->tree_root; | |
537 | struct btrfs_root *root = pending->root; | |
538 | struct extent_buffer *tmp; | |
539 | int ret; | |
540 | u64 objectid; | |
541 | ||
542 | ret = btrfs_find_free_objectid(trans, tree_root, 0, &objectid); | |
543 | if (ret) | |
544 | goto fail; | |
545 | ||
546 | memcpy(&new_root_item, &root->root_item, sizeof(new_root_item)); | |
547 | ||
548 | key.objectid = objectid; | |
549 | key.offset = 1; | |
550 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
551 | ||
552 | extent_buffer_get(root->node); | |
553 | btrfs_cow_block(trans, root, root->node, NULL, 0, &tmp); | |
554 | free_extent_buffer(tmp); | |
555 | ||
556 | btrfs_copy_root(trans, root, root->node, &tmp, objectid); | |
557 | ||
558 | btrfs_set_root_bytenr(&new_root_item, tmp->start); | |
559 | btrfs_set_root_level(&new_root_item, btrfs_header_level(tmp)); | |
560 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, | |
561 | &new_root_item); | |
562 | free_extent_buffer(tmp); | |
563 | if (ret) | |
564 | goto fail; | |
565 | ||
566 | /* | |
567 | * insert the directory item | |
568 | */ | |
569 | key.offset = (u64)-1; | |
570 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, | |
571 | pending->name, strlen(pending->name), | |
572 | root->fs_info->sb->s_root->d_inode->i_ino, | |
573 | &key, BTRFS_FT_DIR); | |
574 | ||
575 | if (ret) | |
576 | goto fail; | |
577 | ||
578 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, | |
579 | pending->name, strlen(pending->name), objectid, | |
580 | root->fs_info->sb->s_root->d_inode->i_ino); | |
581 | fail: | |
582 | return ret; | |
583 | } | |
584 | ||
585 | static int create_pending_snapshots(struct btrfs_trans_handle *trans, | |
586 | struct btrfs_fs_info *fs_info) | |
587 | { | |
588 | struct btrfs_pending_snapshot *pending; | |
589 | struct list_head *head = &trans->transaction->pending_snapshots; | |
590 | int ret; | |
591 | ||
592 | while(!list_empty(head)) { | |
593 | pending = list_entry(head->next, | |
594 | struct btrfs_pending_snapshot, list); | |
595 | ret = create_pending_snapshot(trans, fs_info, pending); | |
596 | BUG_ON(ret); | |
597 | list_del(&pending->list); | |
598 | kfree(pending->name); | |
599 | kfree(pending); | |
600 | } | |
dc17ff8f CM |
601 | return 0; |
602 | } | |
603 | ||
79154b1b CM |
604 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
605 | struct btrfs_root *root) | |
606 | { | |
15ee9bc7 JB |
607 | unsigned long joined = 0; |
608 | unsigned long timeout = 1; | |
79154b1b | 609 | struct btrfs_transaction *cur_trans; |
8fd17795 | 610 | struct btrfs_transaction *prev_trans = NULL; |
0f7d52f4 | 611 | struct list_head dirty_fs_roots; |
4313b399 | 612 | struct extent_map_tree *pinned_copy; |
79154b1b | 613 | DEFINE_WAIT(wait); |
15ee9bc7 | 614 | int ret; |
79154b1b | 615 | |
0f7d52f4 | 616 | INIT_LIST_HEAD(&dirty_fs_roots); |
d6e4a428 | 617 | |
79154b1b CM |
618 | mutex_lock(&root->fs_info->trans_mutex); |
619 | if (trans->transaction->in_commit) { | |
620 | cur_trans = trans->transaction; | |
621 | trans->transaction->use_count++; | |
ccd467d6 | 622 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b | 623 | btrfs_end_transaction(trans, root); |
ccd467d6 CM |
624 | |
625 | mutex_unlock(&root->fs_info->fs_mutex); | |
79154b1b CM |
626 | ret = wait_for_commit(root, cur_trans); |
627 | BUG_ON(ret); | |
15ee9bc7 JB |
628 | |
629 | mutex_lock(&root->fs_info->trans_mutex); | |
79154b1b | 630 | put_transaction(cur_trans); |
15ee9bc7 JB |
631 | mutex_unlock(&root->fs_info->trans_mutex); |
632 | ||
ccd467d6 | 633 | mutex_lock(&root->fs_info->fs_mutex); |
79154b1b CM |
634 | return 0; |
635 | } | |
4313b399 CM |
636 | |
637 | pinned_copy = kmalloc(sizeof(*pinned_copy), GFP_NOFS); | |
638 | if (!pinned_copy) | |
639 | return -ENOMEM; | |
640 | ||
641 | extent_map_tree_init(pinned_copy, | |
642 | root->fs_info->btree_inode->i_mapping, GFP_NOFS); | |
643 | ||
2c90e5d6 | 644 | trans->transaction->in_commit = 1; |
ccd467d6 CM |
645 | cur_trans = trans->transaction; |
646 | if (cur_trans->list.prev != &root->fs_info->trans_list) { | |
647 | prev_trans = list_entry(cur_trans->list.prev, | |
648 | struct btrfs_transaction, list); | |
649 | if (!prev_trans->commit_done) { | |
650 | prev_trans->use_count++; | |
651 | mutex_unlock(&root->fs_info->fs_mutex); | |
652 | mutex_unlock(&root->fs_info->trans_mutex); | |
653 | ||
654 | wait_for_commit(root, prev_trans); | |
ccd467d6 CM |
655 | |
656 | mutex_lock(&root->fs_info->fs_mutex); | |
657 | mutex_lock(&root->fs_info->trans_mutex); | |
15ee9bc7 | 658 | put_transaction(prev_trans); |
ccd467d6 CM |
659 | } |
660 | } | |
15ee9bc7 JB |
661 | |
662 | do { | |
663 | joined = cur_trans->num_joined; | |
2c90e5d6 | 664 | WARN_ON(cur_trans != trans->transaction); |
15ee9bc7 | 665 | prepare_to_wait(&cur_trans->writer_wait, &wait, |
79154b1b | 666 | TASK_UNINTERRUPTIBLE); |
15ee9bc7 JB |
667 | |
668 | if (cur_trans->num_writers > 1) | |
669 | timeout = MAX_SCHEDULE_TIMEOUT; | |
670 | else | |
671 | timeout = 1; | |
672 | ||
ccd467d6 | 673 | mutex_unlock(&root->fs_info->fs_mutex); |
79154b1b | 674 | mutex_unlock(&root->fs_info->trans_mutex); |
15ee9bc7 JB |
675 | |
676 | schedule_timeout(timeout); | |
677 | ||
ccd467d6 | 678 | mutex_lock(&root->fs_info->fs_mutex); |
79154b1b | 679 | mutex_lock(&root->fs_info->trans_mutex); |
15ee9bc7 | 680 | finish_wait(&cur_trans->writer_wait, &wait); |
dc17ff8f CM |
681 | ret = btrfs_write_ordered_inodes(trans, root); |
682 | ||
15ee9bc7 JB |
683 | } while (cur_trans->num_writers > 1 || |
684 | (cur_trans->num_joined != joined)); | |
685 | ||
3063d29f CM |
686 | ret = create_pending_snapshots(trans, root->fs_info); |
687 | BUG_ON(ret); | |
688 | ||
2c90e5d6 | 689 | WARN_ON(cur_trans != trans->transaction); |
dc17ff8f | 690 | |
54aa1f4d CM |
691 | ret = add_dirty_roots(trans, &root->fs_info->fs_roots_radix, |
692 | &dirty_fs_roots); | |
693 | BUG_ON(ret); | |
694 | ||
79154b1b CM |
695 | ret = btrfs_commit_tree_roots(trans, root); |
696 | BUG_ON(ret); | |
54aa1f4d | 697 | |
78fae27e | 698 | cur_trans = root->fs_info->running_transaction; |
cee36a03 | 699 | spin_lock(&root->fs_info->new_trans_lock); |
78fae27e | 700 | root->fs_info->running_transaction = NULL; |
cee36a03 | 701 | spin_unlock(&root->fs_info->new_trans_lock); |
4b52dff6 CM |
702 | btrfs_set_super_generation(&root->fs_info->super_copy, |
703 | cur_trans->transid); | |
704 | btrfs_set_super_root(&root->fs_info->super_copy, | |
db94535d CM |
705 | root->fs_info->tree_root->node->start); |
706 | btrfs_set_super_root_level(&root->fs_info->super_copy, | |
707 | btrfs_header_level(root->fs_info->tree_root->node)); | |
5f39d397 CM |
708 | |
709 | write_extent_buffer(root->fs_info->sb_buffer, | |
710 | &root->fs_info->super_copy, 0, | |
711 | sizeof(root->fs_info->super_copy)); | |
ccd467d6 | 712 | |
4313b399 | 713 | btrfs_copy_pinned(root, pinned_copy); |
ccd467d6 | 714 | |
78fae27e | 715 | mutex_unlock(&root->fs_info->trans_mutex); |
8fd17795 | 716 | mutex_unlock(&root->fs_info->fs_mutex); |
79154b1b CM |
717 | ret = btrfs_write_and_wait_transaction(trans, root); |
718 | BUG_ON(ret); | |
79154b1b | 719 | write_ctree_super(trans, root); |
4313b399 | 720 | |
8fd17795 | 721 | mutex_lock(&root->fs_info->fs_mutex); |
4313b399 | 722 | btrfs_finish_extent_commit(trans, root, pinned_copy); |
78fae27e | 723 | mutex_lock(&root->fs_info->trans_mutex); |
4313b399 CM |
724 | |
725 | kfree(pinned_copy); | |
726 | ||
2c90e5d6 | 727 | cur_trans->commit_done = 1; |
15ee9bc7 | 728 | root->fs_info->last_trans_committed = cur_trans->transid; |
2c90e5d6 | 729 | wake_up(&cur_trans->commit_wait); |
78fae27e | 730 | put_transaction(cur_trans); |
79154b1b | 731 | put_transaction(cur_trans); |
58176a96 | 732 | |
facda1e7 CM |
733 | if (root->fs_info->closing) |
734 | list_splice_init(&root->fs_info->dead_roots, &dirty_fs_roots); | |
735 | else | |
736 | list_splice_init(&dirty_fs_roots, &root->fs_info->dead_roots); | |
58176a96 | 737 | |
78fae27e | 738 | mutex_unlock(&root->fs_info->trans_mutex); |
2c90e5d6 | 739 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b | 740 | |
facda1e7 CM |
741 | if (root->fs_info->closing) { |
742 | mutex_unlock(&root->fs_info->fs_mutex); | |
743 | drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots); | |
744 | mutex_lock(&root->fs_info->fs_mutex); | |
745 | } | |
79154b1b CM |
746 | return ret; |
747 | } | |
748 | ||
e9d0b13b CM |
749 | int btrfs_clean_old_snapshots(struct btrfs_root *root) |
750 | { | |
751 | struct list_head dirty_roots; | |
752 | INIT_LIST_HEAD(&dirty_roots); | |
753 | ||
754 | mutex_lock(&root->fs_info->trans_mutex); | |
755 | list_splice_init(&root->fs_info->dead_roots, &dirty_roots); | |
756 | mutex_unlock(&root->fs_info->trans_mutex); | |
757 | ||
758 | if (!list_empty(&dirty_roots)) { | |
759 | drop_dirty_roots(root, &dirty_roots); | |
760 | } | |
761 | return 0; | |
762 | } | |
6da6abae CM |
763 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
764 | void btrfs_transaction_cleaner(void *p) | |
765 | #else | |
08607c1b | 766 | void btrfs_transaction_cleaner(struct work_struct *work) |
6da6abae | 767 | #endif |
08607c1b | 768 | { |
6da6abae CM |
769 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
770 | struct btrfs_fs_info *fs_info = p; | |
771 | #else | |
08607c1b CM |
772 | struct btrfs_fs_info *fs_info = container_of(work, |
773 | struct btrfs_fs_info, | |
774 | trans_work.work); | |
775 | ||
6da6abae | 776 | #endif |
08607c1b CM |
777 | struct btrfs_root *root = fs_info->tree_root; |
778 | struct btrfs_transaction *cur; | |
779 | struct btrfs_trans_handle *trans; | |
780 | unsigned long now; | |
781 | unsigned long delay = HZ * 30; | |
782 | int ret; | |
783 | ||
08607c1b CM |
784 | mutex_lock(&root->fs_info->fs_mutex); |
785 | mutex_lock(&root->fs_info->trans_mutex); | |
786 | cur = root->fs_info->running_transaction; | |
787 | if (!cur) { | |
788 | mutex_unlock(&root->fs_info->trans_mutex); | |
789 | goto out; | |
790 | } | |
791 | now = get_seconds(); | |
792 | if (now < cur->start_time || now - cur->start_time < 30) { | |
793 | mutex_unlock(&root->fs_info->trans_mutex); | |
794 | delay = HZ * 5; | |
795 | goto out; | |
796 | } | |
797 | mutex_unlock(&root->fs_info->trans_mutex); | |
6702ed49 | 798 | btrfs_defrag_dirty_roots(root->fs_info); |
08607c1b CM |
799 | trans = btrfs_start_transaction(root, 1); |
800 | ret = btrfs_commit_transaction(trans, root); | |
801 | out: | |
802 | mutex_unlock(&root->fs_info->fs_mutex); | |
e9d0b13b | 803 | btrfs_clean_old_snapshots(root); |
08607c1b CM |
804 | btrfs_transaction_queue_work(root, delay); |
805 | } | |
806 | ||
807 | void btrfs_transaction_queue_work(struct btrfs_root *root, int delay) | |
808 | { | |
809 | queue_delayed_work(trans_wq, &root->fs_info->trans_work, delay); | |
810 | } | |
811 | ||
812 | void btrfs_transaction_flush_work(struct btrfs_root *root) | |
813 | { | |
814 | cancel_rearming_delayed_workqueue(trans_wq, &root->fs_info->trans_work); | |
815 | flush_workqueue(trans_wq); | |
816 | } | |
817 | ||
818 | void __init btrfs_init_transaction_sys(void) | |
819 | { | |
820 | trans_wq = create_workqueue("btrfs"); | |
821 | } | |
822 | ||
17636e03 | 823 | void btrfs_exit_transaction_sys(void) |
08607c1b CM |
824 | { |
825 | destroy_workqueue(trans_wq); | |
826 | } | |
827 |