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" | |
925baedd | 26 | #include "locking.h" |
79154b1b | 27 | |
78fae27e | 28 | static int total_trans = 0; |
2c90e5d6 CM |
29 | extern struct kmem_cache *btrfs_trans_handle_cachep; |
30 | extern struct kmem_cache *btrfs_transaction_cachep; | |
31 | ||
0f7d52f4 CM |
32 | #define BTRFS_ROOT_TRANS_TAG 0 |
33 | ||
80b6794d | 34 | static noinline void put_transaction(struct btrfs_transaction *transaction) |
79154b1b | 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 | ||
80b6794d | 47 | static noinline int join_transaction(struct btrfs_root *root) |
79154b1b CM |
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++; |
e18e4809 | 57 | root->fs_info->last_alloc = 0; |
4529ba49 | 58 | root->fs_info->last_data_alloc = 0; |
15ee9bc7 JB |
59 | cur_trans->num_writers = 1; |
60 | cur_trans->num_joined = 0; | |
0f7d52f4 | 61 | cur_trans->transid = root->fs_info->generation; |
79154b1b CM |
62 | init_waitqueue_head(&cur_trans->writer_wait); |
63 | init_waitqueue_head(&cur_trans->commit_wait); | |
64 | cur_trans->in_commit = 0; | |
f9295749 | 65 | cur_trans->blocked = 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); |
d1310b2e | 71 | extent_io_tree_init(&cur_trans->dirty_pages, |
5f39d397 CM |
72 | root->fs_info->btree_inode->i_mapping, |
73 | GFP_NOFS); | |
48ec2cf8 CM |
74 | spin_lock(&root->fs_info->new_trans_lock); |
75 | root->fs_info->running_transaction = cur_trans; | |
76 | spin_unlock(&root->fs_info->new_trans_lock); | |
15ee9bc7 JB |
77 | } else { |
78 | cur_trans->num_writers++; | |
79 | cur_trans->num_joined++; | |
79154b1b | 80 | } |
15ee9bc7 | 81 | |
79154b1b CM |
82 | return 0; |
83 | } | |
84 | ||
80b6794d | 85 | static noinline int record_root_in_trans(struct btrfs_root *root) |
6702ed49 CM |
86 | { |
87 | u64 running_trans_id = root->fs_info->running_transaction->transid; | |
88 | if (root->ref_cows && root->last_trans < running_trans_id) { | |
89 | WARN_ON(root == root->fs_info->extent_root); | |
90 | if (root->root_item.refs != 0) { | |
91 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, | |
92 | (unsigned long)root->root_key.objectid, | |
93 | BTRFS_ROOT_TRANS_TAG); | |
925baedd | 94 | root->commit_root = btrfs_root_node(root); |
6702ed49 CM |
95 | } else { |
96 | WARN_ON(1); | |
97 | } | |
98 | root->last_trans = running_trans_id; | |
99 | } | |
100 | return 0; | |
101 | } | |
102 | ||
f9295749 CM |
103 | struct btrfs_trans_handle *start_transaction(struct btrfs_root *root, |
104 | int num_blocks, int join) | |
79154b1b | 105 | { |
2c90e5d6 CM |
106 | struct btrfs_trans_handle *h = |
107 | kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); | |
f9295749 | 108 | struct btrfs_transaction *cur_trans; |
79154b1b CM |
109 | int ret; |
110 | ||
111 | mutex_lock(&root->fs_info->trans_mutex); | |
f9295749 CM |
112 | cur_trans = root->fs_info->running_transaction; |
113 | if (cur_trans && cur_trans->blocked && !join) { | |
114 | DEFINE_WAIT(wait); | |
115 | cur_trans->use_count++; | |
116 | while(1) { | |
117 | prepare_to_wait(&root->fs_info->transaction_wait, &wait, | |
118 | TASK_UNINTERRUPTIBLE); | |
119 | if (cur_trans->blocked) { | |
120 | mutex_unlock(&root->fs_info->trans_mutex); | |
121 | schedule(); | |
122 | mutex_lock(&root->fs_info->trans_mutex); | |
123 | finish_wait(&root->fs_info->transaction_wait, | |
124 | &wait); | |
125 | } else { | |
126 | finish_wait(&root->fs_info->transaction_wait, | |
127 | &wait); | |
128 | break; | |
129 | } | |
130 | } | |
131 | put_transaction(cur_trans); | |
132 | } | |
79154b1b CM |
133 | ret = join_transaction(root); |
134 | BUG_ON(ret); | |
0f7d52f4 | 135 | |
6702ed49 CM |
136 | record_root_in_trans(root); |
137 | h->transid = root->fs_info->running_transaction->transid; | |
79154b1b CM |
138 | h->transaction = root->fs_info->running_transaction; |
139 | h->blocks_reserved = num_blocks; | |
140 | h->blocks_used = 0; | |
31f3c99b | 141 | h->block_group = NULL; |
26b8003f CM |
142 | h->alloc_exclude_nr = 0; |
143 | h->alloc_exclude_start = 0; | |
79154b1b CM |
144 | root->fs_info->running_transaction->use_count++; |
145 | mutex_unlock(&root->fs_info->trans_mutex); | |
146 | return h; | |
147 | } | |
148 | ||
f9295749 CM |
149 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
150 | int num_blocks) | |
151 | { | |
152 | return start_transaction(root, num_blocks, 0); | |
153 | } | |
154 | struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root, | |
155 | int num_blocks) | |
156 | { | |
157 | return start_transaction(root, num_blocks, 1); | |
158 | } | |
159 | ||
89ce8a63 CM |
160 | static noinline int wait_for_commit(struct btrfs_root *root, |
161 | struct btrfs_transaction *commit) | |
162 | { | |
163 | DEFINE_WAIT(wait); | |
164 | mutex_lock(&root->fs_info->trans_mutex); | |
165 | while(!commit->commit_done) { | |
166 | prepare_to_wait(&commit->commit_wait, &wait, | |
167 | TASK_UNINTERRUPTIBLE); | |
168 | if (commit->commit_done) | |
169 | break; | |
170 | mutex_unlock(&root->fs_info->trans_mutex); | |
171 | schedule(); | |
172 | mutex_lock(&root->fs_info->trans_mutex); | |
173 | } | |
174 | mutex_unlock(&root->fs_info->trans_mutex); | |
175 | finish_wait(&commit->commit_wait, &wait); | |
176 | return 0; | |
177 | } | |
178 | ||
179 | static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, | |
180 | struct btrfs_root *root, int throttle) | |
79154b1b CM |
181 | { |
182 | struct btrfs_transaction *cur_trans; | |
d6e4a428 | 183 | |
79154b1b CM |
184 | mutex_lock(&root->fs_info->trans_mutex); |
185 | cur_trans = root->fs_info->running_transaction; | |
ccd467d6 | 186 | WARN_ON(cur_trans != trans->transaction); |
d5719762 | 187 | WARN_ON(cur_trans->num_writers < 1); |
ccd467d6 | 188 | cur_trans->num_writers--; |
89ce8a63 | 189 | |
79154b1b CM |
190 | if (waitqueue_active(&cur_trans->writer_wait)) |
191 | wake_up(&cur_trans->writer_wait); | |
89ce8a63 | 192 | |
f9295749 | 193 | if (0 && cur_trans->in_commit && throttle) { |
e6dcd2dc | 194 | DEFINE_WAIT(wait); |
89ce8a63 | 195 | mutex_unlock(&root->fs_info->trans_mutex); |
e6dcd2dc CM |
196 | prepare_to_wait(&root->fs_info->transaction_throttle, &wait, |
197 | TASK_UNINTERRUPTIBLE); | |
198 | schedule(); | |
199 | finish_wait(&root->fs_info->transaction_throttle, &wait); | |
89ce8a63 CM |
200 | mutex_lock(&root->fs_info->trans_mutex); |
201 | } | |
202 | ||
79154b1b CM |
203 | put_transaction(cur_trans); |
204 | mutex_unlock(&root->fs_info->trans_mutex); | |
d6025579 | 205 | memset(trans, 0, sizeof(*trans)); |
2c90e5d6 | 206 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b CM |
207 | return 0; |
208 | } | |
209 | ||
89ce8a63 CM |
210 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, |
211 | struct btrfs_root *root) | |
212 | { | |
213 | return __btrfs_end_transaction(trans, root, 0); | |
214 | } | |
215 | ||
216 | int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, | |
217 | struct btrfs_root *root) | |
218 | { | |
219 | return __btrfs_end_transaction(trans, root, 1); | |
220 | } | |
221 | ||
79154b1b CM |
222 | |
223 | int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, | |
224 | struct btrfs_root *root) | |
225 | { | |
7c4452b9 | 226 | int ret; |
7c4452b9 CM |
227 | int err; |
228 | int werr = 0; | |
d1310b2e | 229 | struct extent_io_tree *dirty_pages; |
7c4452b9 | 230 | struct page *page; |
7c4452b9 | 231 | struct inode *btree_inode = root->fs_info->btree_inode; |
5f39d397 CM |
232 | u64 start; |
233 | u64 end; | |
234 | unsigned long index; | |
7c4452b9 CM |
235 | |
236 | if (!trans || !trans->transaction) { | |
237 | return filemap_write_and_wait(btree_inode->i_mapping); | |
238 | } | |
239 | dirty_pages = &trans->transaction->dirty_pages; | |
240 | while(1) { | |
5f39d397 CM |
241 | ret = find_first_extent_bit(dirty_pages, 0, &start, &end, |
242 | EXTENT_DIRTY); | |
243 | if (ret) | |
7c4452b9 | 244 | break; |
5f39d397 CM |
245 | clear_extent_dirty(dirty_pages, start, end, GFP_NOFS); |
246 | while(start <= end) { | |
247 | index = start >> PAGE_CACHE_SHIFT; | |
35ebb934 | 248 | start = (u64)(index + 1) << PAGE_CACHE_SHIFT; |
5f39d397 | 249 | page = find_lock_page(btree_inode->i_mapping, index); |
7c4452b9 CM |
250 | if (!page) |
251 | continue; | |
6702ed49 CM |
252 | if (PageWriteback(page)) { |
253 | if (PageDirty(page)) | |
254 | wait_on_page_writeback(page); | |
255 | else { | |
256 | unlock_page(page); | |
257 | page_cache_release(page); | |
258 | continue; | |
259 | } | |
260 | } | |
7c4452b9 CM |
261 | err = write_one_page(page, 0); |
262 | if (err) | |
263 | werr = err; | |
264 | page_cache_release(page); | |
265 | } | |
266 | } | |
267 | err = filemap_fdatawait(btree_inode->i_mapping); | |
268 | if (err) | |
269 | werr = err; | |
270 | return werr; | |
79154b1b CM |
271 | } |
272 | ||
0b86a832 CM |
273 | static int update_cowonly_root(struct btrfs_trans_handle *trans, |
274 | struct btrfs_root *root) | |
79154b1b CM |
275 | { |
276 | int ret; | |
0b86a832 CM |
277 | u64 old_root_bytenr; |
278 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
79154b1b | 279 | |
0b86a832 | 280 | btrfs_write_dirty_block_groups(trans, root); |
79154b1b | 281 | while(1) { |
0b86a832 CM |
282 | old_root_bytenr = btrfs_root_bytenr(&root->root_item); |
283 | if (old_root_bytenr == root->node->start) | |
79154b1b | 284 | break; |
0b86a832 CM |
285 | btrfs_set_root_bytenr(&root->root_item, |
286 | root->node->start); | |
287 | btrfs_set_root_level(&root->root_item, | |
288 | btrfs_header_level(root->node)); | |
79154b1b | 289 | ret = btrfs_update_root(trans, tree_root, |
0b86a832 CM |
290 | &root->root_key, |
291 | &root->root_item); | |
79154b1b | 292 | BUG_ON(ret); |
0b86a832 CM |
293 | btrfs_write_dirty_block_groups(trans, root); |
294 | } | |
295 | return 0; | |
296 | } | |
297 | ||
298 | int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans, | |
299 | struct btrfs_root *root) | |
300 | { | |
301 | struct btrfs_fs_info *fs_info = root->fs_info; | |
302 | struct list_head *next; | |
303 | ||
304 | while(!list_empty(&fs_info->dirty_cowonly_roots)) { | |
305 | next = fs_info->dirty_cowonly_roots.next; | |
306 | list_del_init(next); | |
307 | root = list_entry(next, struct btrfs_root, dirty_list); | |
308 | update_cowonly_root(trans, root); | |
79154b1b CM |
309 | } |
310 | return 0; | |
311 | } | |
312 | ||
0f7d52f4 CM |
313 | struct dirty_root { |
314 | struct list_head list; | |
0f7d52f4 | 315 | struct btrfs_root *root; |
58176a96 | 316 | struct btrfs_root *latest_root; |
0f7d52f4 CM |
317 | }; |
318 | ||
5ce14bbc CM |
319 | int btrfs_add_dead_root(struct btrfs_root *root, |
320 | struct btrfs_root *latest, | |
321 | struct list_head *dead_list) | |
5eda7b5e CM |
322 | { |
323 | struct dirty_root *dirty; | |
324 | ||
325 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
326 | if (!dirty) | |
327 | return -ENOMEM; | |
5eda7b5e | 328 | dirty->root = root; |
5ce14bbc | 329 | dirty->latest_root = latest; |
5eda7b5e CM |
330 | list_add(&dirty->list, dead_list); |
331 | return 0; | |
332 | } | |
333 | ||
80b6794d CM |
334 | static noinline int add_dirty_roots(struct btrfs_trans_handle *trans, |
335 | struct radix_tree_root *radix, | |
336 | struct list_head *list) | |
0f7d52f4 CM |
337 | { |
338 | struct dirty_root *dirty; | |
339 | struct btrfs_root *gang[8]; | |
340 | struct btrfs_root *root; | |
341 | int i; | |
342 | int ret; | |
54aa1f4d | 343 | int err = 0; |
5eda7b5e | 344 | u32 refs; |
54aa1f4d | 345 | |
0f7d52f4 CM |
346 | while(1) { |
347 | ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0, | |
348 | ARRAY_SIZE(gang), | |
349 | BTRFS_ROOT_TRANS_TAG); | |
350 | if (ret == 0) | |
351 | break; | |
352 | for (i = 0; i < ret; i++) { | |
353 | root = gang[i]; | |
2619ba1f CM |
354 | radix_tree_tag_clear(radix, |
355 | (unsigned long)root->root_key.objectid, | |
356 | BTRFS_ROOT_TRANS_TAG); | |
0f7d52f4 | 357 | if (root->commit_root == root->node) { |
db94535d CM |
358 | WARN_ON(root->node->start != |
359 | btrfs_root_bytenr(&root->root_item)); | |
5f39d397 | 360 | free_extent_buffer(root->commit_root); |
0f7d52f4 | 361 | root->commit_root = NULL; |
58176a96 JB |
362 | |
363 | /* make sure to update the root on disk | |
364 | * so we get any updates to the block used | |
365 | * counts | |
366 | */ | |
367 | err = btrfs_update_root(trans, | |
368 | root->fs_info->tree_root, | |
369 | &root->root_key, | |
370 | &root->root_item); | |
0f7d52f4 CM |
371 | continue; |
372 | } | |
373 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
374 | BUG_ON(!dirty); | |
9f3a7427 CM |
375 | dirty->root = kmalloc(sizeof(*dirty->root), GFP_NOFS); |
376 | BUG_ON(!dirty->root); | |
377 | ||
378 | memset(&root->root_item.drop_progress, 0, | |
379 | sizeof(struct btrfs_disk_key)); | |
380 | root->root_item.drop_level = 0; | |
381 | ||
382 | memcpy(dirty->root, root, sizeof(*root)); | |
383 | dirty->root->node = root->commit_root; | |
58176a96 | 384 | dirty->latest_root = root; |
ed98b56a CM |
385 | spin_lock_init(&dirty->root->node_lock); |
386 | mutex_init(&dirty->root->objectid_mutex); | |
387 | ||
0f7d52f4 | 388 | root->commit_root = NULL; |
5eda7b5e | 389 | |
0f7d52f4 | 390 | root->root_key.offset = root->fs_info->generation; |
db94535d CM |
391 | btrfs_set_root_bytenr(&root->root_item, |
392 | root->node->start); | |
393 | btrfs_set_root_level(&root->root_item, | |
394 | btrfs_header_level(root->node)); | |
0f7d52f4 CM |
395 | err = btrfs_insert_root(trans, root->fs_info->tree_root, |
396 | &root->root_key, | |
397 | &root->root_item); | |
54aa1f4d CM |
398 | if (err) |
399 | break; | |
9f3a7427 CM |
400 | |
401 | refs = btrfs_root_refs(&dirty->root->root_item); | |
402 | btrfs_set_root_refs(&dirty->root->root_item, refs - 1); | |
5eda7b5e | 403 | err = btrfs_update_root(trans, root->fs_info->tree_root, |
9f3a7427 CM |
404 | &dirty->root->root_key, |
405 | &dirty->root->root_item); | |
5eda7b5e CM |
406 | |
407 | BUG_ON(err); | |
9f3a7427 | 408 | if (refs == 1) { |
5eda7b5e | 409 | list_add(&dirty->list, list); |
9f3a7427 CM |
410 | } else { |
411 | WARN_ON(1); | |
412 | kfree(dirty->root); | |
5eda7b5e | 413 | kfree(dirty); |
9f3a7427 | 414 | } |
0f7d52f4 CM |
415 | } |
416 | } | |
54aa1f4d | 417 | return err; |
0f7d52f4 CM |
418 | } |
419 | ||
e9d0b13b CM |
420 | int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) |
421 | { | |
422 | struct btrfs_fs_info *info = root->fs_info; | |
423 | int ret; | |
424 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 425 | unsigned long nr; |
e9d0b13b | 426 | |
a2135011 | 427 | smp_mb(); |
e9d0b13b CM |
428 | if (root->defrag_running) |
429 | return 0; | |
e9d0b13b | 430 | trans = btrfs_start_transaction(root, 1); |
6b80053d | 431 | while (1) { |
e9d0b13b CM |
432 | root->defrag_running = 1; |
433 | ret = btrfs_defrag_leaves(trans, root, cacheonly); | |
d3c2fdcf | 434 | nr = trans->blocks_used; |
e9d0b13b | 435 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 436 | btrfs_btree_balance_dirty(info->tree_root, nr); |
e9d0b13b CM |
437 | cond_resched(); |
438 | ||
e9d0b13b | 439 | trans = btrfs_start_transaction(root, 1); |
3f157a2f | 440 | if (root->fs_info->closing || ret != -EAGAIN) |
e9d0b13b CM |
441 | break; |
442 | } | |
443 | root->defrag_running = 0; | |
a2135011 | 444 | smp_mb(); |
e9d0b13b CM |
445 | btrfs_end_transaction(trans, root); |
446 | return 0; | |
447 | } | |
448 | ||
80b6794d CM |
449 | static noinline int drop_dirty_roots(struct btrfs_root *tree_root, |
450 | struct list_head *list) | |
0f7d52f4 CM |
451 | { |
452 | struct dirty_root *dirty; | |
453 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 454 | unsigned long nr; |
db94535d CM |
455 | u64 num_bytes; |
456 | u64 bytes_used; | |
54aa1f4d | 457 | int ret = 0; |
9f3a7427 CM |
458 | int err; |
459 | ||
0f7d52f4 | 460 | while(!list_empty(list)) { |
58176a96 JB |
461 | struct btrfs_root *root; |
462 | ||
0f7d52f4 CM |
463 | dirty = list_entry(list->next, struct dirty_root, list); |
464 | list_del_init(&dirty->list); | |
5eda7b5e | 465 | |
db94535d | 466 | num_bytes = btrfs_root_used(&dirty->root->root_item); |
58176a96 | 467 | root = dirty->latest_root; |
a2135011 | 468 | atomic_inc(&root->fs_info->throttles); |
58176a96 | 469 | |
a2135011 | 470 | mutex_lock(&root->fs_info->drop_mutex); |
9f3a7427 CM |
471 | while(1) { |
472 | trans = btrfs_start_transaction(tree_root, 1); | |
473 | ret = btrfs_drop_snapshot(trans, dirty->root); | |
474 | if (ret != -EAGAIN) { | |
475 | break; | |
476 | } | |
58176a96 | 477 | |
9f3a7427 CM |
478 | err = btrfs_update_root(trans, |
479 | tree_root, | |
480 | &dirty->root->root_key, | |
481 | &dirty->root->root_item); | |
482 | if (err) | |
483 | ret = err; | |
d3c2fdcf | 484 | nr = trans->blocks_used; |
1b1e2135 | 485 | ret = btrfs_end_transaction_throttle(trans, tree_root); |
9f3a7427 | 486 | BUG_ON(ret); |
a2135011 CM |
487 | |
488 | mutex_unlock(&root->fs_info->drop_mutex); | |
d3c2fdcf | 489 | btrfs_btree_balance_dirty(tree_root, nr); |
4dc11904 | 490 | cond_resched(); |
a2135011 | 491 | mutex_lock(&root->fs_info->drop_mutex); |
9f3a7427 | 492 | } |
0f7d52f4 | 493 | BUG_ON(ret); |
a2135011 | 494 | atomic_dec(&root->fs_info->throttles); |
58176a96 | 495 | |
a2135011 | 496 | mutex_lock(&root->fs_info->alloc_mutex); |
db94535d CM |
497 | num_bytes -= btrfs_root_used(&dirty->root->root_item); |
498 | bytes_used = btrfs_root_used(&root->root_item); | |
499 | if (num_bytes) { | |
58176a96 | 500 | record_root_in_trans(root); |
5f39d397 | 501 | btrfs_set_root_used(&root->root_item, |
db94535d | 502 | bytes_used - num_bytes); |
58176a96 | 503 | } |
a2135011 CM |
504 | mutex_unlock(&root->fs_info->alloc_mutex); |
505 | ||
9f3a7427 | 506 | ret = btrfs_del_root(trans, tree_root, &dirty->root->root_key); |
58176a96 JB |
507 | if (ret) { |
508 | BUG(); | |
54aa1f4d | 509 | break; |
58176a96 | 510 | } |
a2135011 CM |
511 | mutex_unlock(&root->fs_info->drop_mutex); |
512 | ||
d3c2fdcf | 513 | nr = trans->blocks_used; |
0f7d52f4 CM |
514 | ret = btrfs_end_transaction(trans, tree_root); |
515 | BUG_ON(ret); | |
5eda7b5e | 516 | |
f510cfec | 517 | free_extent_buffer(dirty->root->node); |
9f3a7427 | 518 | kfree(dirty->root); |
0f7d52f4 | 519 | kfree(dirty); |
d3c2fdcf CM |
520 | |
521 | btrfs_btree_balance_dirty(tree_root, nr); | |
4dc11904 | 522 | cond_resched(); |
0f7d52f4 | 523 | } |
54aa1f4d | 524 | return ret; |
0f7d52f4 CM |
525 | } |
526 | ||
80b6794d | 527 | static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, |
3063d29f CM |
528 | struct btrfs_fs_info *fs_info, |
529 | struct btrfs_pending_snapshot *pending) | |
530 | { | |
531 | struct btrfs_key key; | |
80b6794d | 532 | struct btrfs_root_item *new_root_item; |
3063d29f CM |
533 | struct btrfs_root *tree_root = fs_info->tree_root; |
534 | struct btrfs_root *root = pending->root; | |
535 | struct extent_buffer *tmp; | |
925baedd | 536 | struct extent_buffer *old; |
3063d29f | 537 | int ret; |
3b96362c | 538 | int namelen; |
3063d29f CM |
539 | u64 objectid; |
540 | ||
80b6794d CM |
541 | new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS); |
542 | if (!new_root_item) { | |
543 | ret = -ENOMEM; | |
544 | goto fail; | |
545 | } | |
3063d29f CM |
546 | ret = btrfs_find_free_objectid(trans, tree_root, 0, &objectid); |
547 | if (ret) | |
548 | goto fail; | |
549 | ||
80b6794d | 550 | memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); |
3063d29f CM |
551 | |
552 | key.objectid = objectid; | |
553 | key.offset = 1; | |
554 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
555 | ||
925baedd CM |
556 | old = btrfs_lock_root_node(root); |
557 | btrfs_cow_block(trans, root, old, NULL, 0, &old); | |
3063d29f | 558 | |
925baedd CM |
559 | btrfs_copy_root(trans, root, old, &tmp, objectid); |
560 | btrfs_tree_unlock(old); | |
561 | free_extent_buffer(old); | |
3063d29f | 562 | |
80b6794d CM |
563 | btrfs_set_root_bytenr(new_root_item, tmp->start); |
564 | btrfs_set_root_level(new_root_item, btrfs_header_level(tmp)); | |
3063d29f | 565 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
80b6794d | 566 | new_root_item); |
925baedd | 567 | btrfs_tree_unlock(tmp); |
3063d29f CM |
568 | free_extent_buffer(tmp); |
569 | if (ret) | |
570 | goto fail; | |
571 | ||
572 | /* | |
573 | * insert the directory item | |
574 | */ | |
575 | key.offset = (u64)-1; | |
3b96362c | 576 | namelen = strlen(pending->name); |
3063d29f | 577 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, |
3b96362c | 578 | pending->name, namelen, |
3063d29f CM |
579 | root->fs_info->sb->s_root->d_inode->i_ino, |
580 | &key, BTRFS_FT_DIR); | |
581 | ||
582 | if (ret) | |
583 | goto fail; | |
584 | ||
585 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, | |
586 | pending->name, strlen(pending->name), objectid, | |
587 | root->fs_info->sb->s_root->d_inode->i_ino); | |
3b96362c SW |
588 | |
589 | /* Invalidate existing dcache entry for new snapshot. */ | |
590 | btrfs_invalidate_dcache_root(root, pending->name, namelen); | |
591 | ||
3063d29f | 592 | fail: |
80b6794d | 593 | kfree(new_root_item); |
3063d29f CM |
594 | return ret; |
595 | } | |
596 | ||
80b6794d CM |
597 | static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, |
598 | struct btrfs_fs_info *fs_info) | |
3063d29f CM |
599 | { |
600 | struct btrfs_pending_snapshot *pending; | |
601 | struct list_head *head = &trans->transaction->pending_snapshots; | |
602 | int ret; | |
603 | ||
604 | while(!list_empty(head)) { | |
605 | pending = list_entry(head->next, | |
606 | struct btrfs_pending_snapshot, list); | |
607 | ret = create_pending_snapshot(trans, fs_info, pending); | |
608 | BUG_ON(ret); | |
609 | list_del(&pending->list); | |
610 | kfree(pending->name); | |
611 | kfree(pending); | |
612 | } | |
dc17ff8f CM |
613 | return 0; |
614 | } | |
615 | ||
79154b1b CM |
616 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
617 | struct btrfs_root *root) | |
618 | { | |
15ee9bc7 JB |
619 | unsigned long joined = 0; |
620 | unsigned long timeout = 1; | |
79154b1b | 621 | struct btrfs_transaction *cur_trans; |
8fd17795 | 622 | struct btrfs_transaction *prev_trans = NULL; |
0b86a832 | 623 | struct btrfs_root *chunk_root = root->fs_info->chunk_root; |
0f7d52f4 | 624 | struct list_head dirty_fs_roots; |
d1310b2e | 625 | struct extent_io_tree *pinned_copy; |
79154b1b | 626 | DEFINE_WAIT(wait); |
15ee9bc7 | 627 | int ret; |
79154b1b | 628 | |
0f7d52f4 | 629 | INIT_LIST_HEAD(&dirty_fs_roots); |
d6e4a428 | 630 | |
79154b1b CM |
631 | mutex_lock(&root->fs_info->trans_mutex); |
632 | if (trans->transaction->in_commit) { | |
633 | cur_trans = trans->transaction; | |
634 | trans->transaction->use_count++; | |
ccd467d6 | 635 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b | 636 | btrfs_end_transaction(trans, root); |
ccd467d6 | 637 | |
79154b1b CM |
638 | ret = wait_for_commit(root, cur_trans); |
639 | BUG_ON(ret); | |
15ee9bc7 JB |
640 | |
641 | mutex_lock(&root->fs_info->trans_mutex); | |
79154b1b | 642 | put_transaction(cur_trans); |
15ee9bc7 JB |
643 | mutex_unlock(&root->fs_info->trans_mutex); |
644 | ||
79154b1b CM |
645 | return 0; |
646 | } | |
4313b399 CM |
647 | |
648 | pinned_copy = kmalloc(sizeof(*pinned_copy), GFP_NOFS); | |
649 | if (!pinned_copy) | |
650 | return -ENOMEM; | |
651 | ||
d1310b2e | 652 | extent_io_tree_init(pinned_copy, |
4313b399 CM |
653 | root->fs_info->btree_inode->i_mapping, GFP_NOFS); |
654 | ||
2c90e5d6 | 655 | trans->transaction->in_commit = 1; |
f9295749 | 656 | trans->transaction->blocked = 1; |
ccd467d6 CM |
657 | cur_trans = trans->transaction; |
658 | if (cur_trans->list.prev != &root->fs_info->trans_list) { | |
659 | prev_trans = list_entry(cur_trans->list.prev, | |
660 | struct btrfs_transaction, list); | |
661 | if (!prev_trans->commit_done) { | |
662 | prev_trans->use_count++; | |
ccd467d6 CM |
663 | mutex_unlock(&root->fs_info->trans_mutex); |
664 | ||
665 | wait_for_commit(root, prev_trans); | |
ccd467d6 | 666 | |
ccd467d6 | 667 | mutex_lock(&root->fs_info->trans_mutex); |
15ee9bc7 | 668 | put_transaction(prev_trans); |
ccd467d6 CM |
669 | } |
670 | } | |
15ee9bc7 JB |
671 | |
672 | do { | |
673 | joined = cur_trans->num_joined; | |
2c90e5d6 | 674 | WARN_ON(cur_trans != trans->transaction); |
15ee9bc7 | 675 | prepare_to_wait(&cur_trans->writer_wait, &wait, |
79154b1b | 676 | TASK_UNINTERRUPTIBLE); |
15ee9bc7 JB |
677 | |
678 | if (cur_trans->num_writers > 1) | |
679 | timeout = MAX_SCHEDULE_TIMEOUT; | |
680 | else | |
681 | timeout = 1; | |
682 | ||
79154b1b | 683 | mutex_unlock(&root->fs_info->trans_mutex); |
15ee9bc7 JB |
684 | |
685 | schedule_timeout(timeout); | |
686 | ||
79154b1b | 687 | mutex_lock(&root->fs_info->trans_mutex); |
15ee9bc7 JB |
688 | finish_wait(&cur_trans->writer_wait, &wait); |
689 | } while (cur_trans->num_writers > 1 || | |
690 | (cur_trans->num_joined != joined)); | |
691 | ||
3063d29f CM |
692 | ret = create_pending_snapshots(trans, root->fs_info); |
693 | BUG_ON(ret); | |
694 | ||
2c90e5d6 | 695 | WARN_ON(cur_trans != trans->transaction); |
dc17ff8f | 696 | |
54aa1f4d CM |
697 | ret = add_dirty_roots(trans, &root->fs_info->fs_roots_radix, |
698 | &dirty_fs_roots); | |
699 | BUG_ON(ret); | |
700 | ||
79154b1b CM |
701 | ret = btrfs_commit_tree_roots(trans, root); |
702 | BUG_ON(ret); | |
54aa1f4d | 703 | |
78fae27e | 704 | cur_trans = root->fs_info->running_transaction; |
cee36a03 | 705 | spin_lock(&root->fs_info->new_trans_lock); |
78fae27e | 706 | root->fs_info->running_transaction = NULL; |
cee36a03 | 707 | spin_unlock(&root->fs_info->new_trans_lock); |
4b52dff6 CM |
708 | btrfs_set_super_generation(&root->fs_info->super_copy, |
709 | cur_trans->transid); | |
710 | btrfs_set_super_root(&root->fs_info->super_copy, | |
db94535d CM |
711 | root->fs_info->tree_root->node->start); |
712 | btrfs_set_super_root_level(&root->fs_info->super_copy, | |
713 | btrfs_header_level(root->fs_info->tree_root->node)); | |
5f39d397 | 714 | |
0b86a832 CM |
715 | btrfs_set_super_chunk_root(&root->fs_info->super_copy, |
716 | chunk_root->node->start); | |
717 | btrfs_set_super_chunk_root_level(&root->fs_info->super_copy, | |
718 | btrfs_header_level(chunk_root->node)); | |
a061fc8d CM |
719 | memcpy(&root->fs_info->super_for_commit, &root->fs_info->super_copy, |
720 | sizeof(root->fs_info->super_copy)); | |
ccd467d6 | 721 | |
4313b399 | 722 | btrfs_copy_pinned(root, pinned_copy); |
ccd467d6 | 723 | |
f9295749 | 724 | trans->transaction->blocked = 0; |
e6dcd2dc | 725 | wake_up(&root->fs_info->transaction_throttle); |
f9295749 | 726 | wake_up(&root->fs_info->transaction_wait); |
e6dcd2dc | 727 | |
78fae27e | 728 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b CM |
729 | ret = btrfs_write_and_wait_transaction(trans, root); |
730 | BUG_ON(ret); | |
79154b1b | 731 | write_ctree_super(trans, root); |
4313b399 | 732 | |
4313b399 | 733 | btrfs_finish_extent_commit(trans, root, pinned_copy); |
78fae27e | 734 | mutex_lock(&root->fs_info->trans_mutex); |
4313b399 CM |
735 | |
736 | kfree(pinned_copy); | |
737 | ||
2c90e5d6 | 738 | cur_trans->commit_done = 1; |
15ee9bc7 | 739 | root->fs_info->last_trans_committed = cur_trans->transid; |
2c90e5d6 | 740 | wake_up(&cur_trans->commit_wait); |
78fae27e | 741 | put_transaction(cur_trans); |
79154b1b | 742 | put_transaction(cur_trans); |
58176a96 | 743 | |
facda1e7 CM |
744 | if (root->fs_info->closing) |
745 | list_splice_init(&root->fs_info->dead_roots, &dirty_fs_roots); | |
746 | else | |
747 | list_splice_init(&dirty_fs_roots, &root->fs_info->dead_roots); | |
58176a96 | 748 | |
78fae27e | 749 | mutex_unlock(&root->fs_info->trans_mutex); |
2c90e5d6 | 750 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b | 751 | |
facda1e7 | 752 | if (root->fs_info->closing) { |
facda1e7 | 753 | drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots); |
facda1e7 | 754 | } |
79154b1b CM |
755 | return ret; |
756 | } | |
757 | ||
e9d0b13b CM |
758 | int btrfs_clean_old_snapshots(struct btrfs_root *root) |
759 | { | |
760 | struct list_head dirty_roots; | |
761 | INIT_LIST_HEAD(&dirty_roots); | |
a74a4b97 | 762 | again: |
e9d0b13b CM |
763 | mutex_lock(&root->fs_info->trans_mutex); |
764 | list_splice_init(&root->fs_info->dead_roots, &dirty_roots); | |
765 | mutex_unlock(&root->fs_info->trans_mutex); | |
766 | ||
767 | if (!list_empty(&dirty_roots)) { | |
768 | drop_dirty_roots(root, &dirty_roots); | |
a74a4b97 | 769 | goto again; |
e9d0b13b CM |
770 | } |
771 | return 0; | |
772 | } | |
08607c1b | 773 |