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; | |
d5719762 | 65 | cur_trans->use_count = 1; |
79154b1b | 66 | cur_trans->commit_done = 0; |
08607c1b | 67 | cur_trans->start_time = get_seconds(); |
3063d29f | 68 | INIT_LIST_HEAD(&cur_trans->pending_snapshots); |
8fd17795 | 69 | list_add_tail(&cur_trans->list, &root->fs_info->trans_list); |
d1310b2e | 70 | extent_io_tree_init(&cur_trans->dirty_pages, |
5f39d397 CM |
71 | root->fs_info->btree_inode->i_mapping, |
72 | GFP_NOFS); | |
48ec2cf8 CM |
73 | spin_lock(&root->fs_info->new_trans_lock); |
74 | root->fs_info->running_transaction = cur_trans; | |
75 | spin_unlock(&root->fs_info->new_trans_lock); | |
15ee9bc7 JB |
76 | } else { |
77 | cur_trans->num_writers++; | |
78 | cur_trans->num_joined++; | |
79154b1b | 79 | } |
15ee9bc7 | 80 | |
79154b1b CM |
81 | return 0; |
82 | } | |
83 | ||
80b6794d | 84 | static noinline int record_root_in_trans(struct btrfs_root *root) |
6702ed49 CM |
85 | { |
86 | u64 running_trans_id = root->fs_info->running_transaction->transid; | |
87 | if (root->ref_cows && root->last_trans < running_trans_id) { | |
88 | WARN_ON(root == root->fs_info->extent_root); | |
89 | if (root->root_item.refs != 0) { | |
90 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, | |
91 | (unsigned long)root->root_key.objectid, | |
92 | BTRFS_ROOT_TRANS_TAG); | |
925baedd | 93 | root->commit_root = btrfs_root_node(root); |
6702ed49 CM |
94 | } else { |
95 | WARN_ON(1); | |
96 | } | |
97 | root->last_trans = running_trans_id; | |
98 | } | |
99 | return 0; | |
100 | } | |
101 | ||
79154b1b CM |
102 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
103 | int num_blocks) | |
104 | { | |
2c90e5d6 CM |
105 | struct btrfs_trans_handle *h = |
106 | kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); | |
79154b1b CM |
107 | int ret; |
108 | ||
109 | mutex_lock(&root->fs_info->trans_mutex); | |
110 | ret = join_transaction(root); | |
111 | BUG_ON(ret); | |
0f7d52f4 | 112 | |
6702ed49 CM |
113 | record_root_in_trans(root); |
114 | h->transid = root->fs_info->running_transaction->transid; | |
79154b1b CM |
115 | h->transaction = root->fs_info->running_transaction; |
116 | h->blocks_reserved = num_blocks; | |
117 | h->blocks_used = 0; | |
31f3c99b | 118 | h->block_group = NULL; |
26b8003f CM |
119 | h->alloc_exclude_nr = 0; |
120 | h->alloc_exclude_start = 0; | |
79154b1b CM |
121 | root->fs_info->running_transaction->use_count++; |
122 | mutex_unlock(&root->fs_info->trans_mutex); | |
123 | return h; | |
124 | } | |
125 | ||
89ce8a63 CM |
126 | static noinline int wait_for_commit(struct btrfs_root *root, |
127 | struct btrfs_transaction *commit) | |
128 | { | |
129 | DEFINE_WAIT(wait); | |
130 | mutex_lock(&root->fs_info->trans_mutex); | |
131 | while(!commit->commit_done) { | |
132 | prepare_to_wait(&commit->commit_wait, &wait, | |
133 | TASK_UNINTERRUPTIBLE); | |
134 | if (commit->commit_done) | |
135 | break; | |
136 | mutex_unlock(&root->fs_info->trans_mutex); | |
137 | schedule(); | |
138 | mutex_lock(&root->fs_info->trans_mutex); | |
139 | } | |
140 | mutex_unlock(&root->fs_info->trans_mutex); | |
141 | finish_wait(&commit->commit_wait, &wait); | |
142 | return 0; | |
143 | } | |
144 | ||
145 | static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, | |
146 | struct btrfs_root *root, int throttle) | |
79154b1b CM |
147 | { |
148 | struct btrfs_transaction *cur_trans; | |
d6e4a428 | 149 | |
79154b1b CM |
150 | mutex_lock(&root->fs_info->trans_mutex); |
151 | cur_trans = root->fs_info->running_transaction; | |
ccd467d6 | 152 | WARN_ON(cur_trans != trans->transaction); |
d5719762 | 153 | WARN_ON(cur_trans->num_writers < 1); |
ccd467d6 | 154 | cur_trans->num_writers--; |
89ce8a63 | 155 | |
79154b1b CM |
156 | if (waitqueue_active(&cur_trans->writer_wait)) |
157 | wake_up(&cur_trans->writer_wait); | |
89ce8a63 CM |
158 | |
159 | if (cur_trans->in_commit && throttle) { | |
e6dcd2dc | 160 | DEFINE_WAIT(wait); |
89ce8a63 | 161 | mutex_unlock(&root->fs_info->trans_mutex); |
e6dcd2dc CM |
162 | prepare_to_wait(&root->fs_info->transaction_throttle, &wait, |
163 | TASK_UNINTERRUPTIBLE); | |
164 | schedule(); | |
165 | finish_wait(&root->fs_info->transaction_throttle, &wait); | |
89ce8a63 CM |
166 | mutex_lock(&root->fs_info->trans_mutex); |
167 | } | |
168 | ||
79154b1b CM |
169 | put_transaction(cur_trans); |
170 | mutex_unlock(&root->fs_info->trans_mutex); | |
d6025579 | 171 | memset(trans, 0, sizeof(*trans)); |
2c90e5d6 | 172 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b CM |
173 | return 0; |
174 | } | |
175 | ||
89ce8a63 CM |
176 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, |
177 | struct btrfs_root *root) | |
178 | { | |
179 | return __btrfs_end_transaction(trans, root, 0); | |
180 | } | |
181 | ||
182 | int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, | |
183 | struct btrfs_root *root) | |
184 | { | |
185 | return __btrfs_end_transaction(trans, root, 1); | |
186 | } | |
187 | ||
79154b1b CM |
188 | |
189 | int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, | |
190 | struct btrfs_root *root) | |
191 | { | |
7c4452b9 | 192 | int ret; |
7c4452b9 CM |
193 | int err; |
194 | int werr = 0; | |
d1310b2e | 195 | struct extent_io_tree *dirty_pages; |
7c4452b9 | 196 | struct page *page; |
7c4452b9 | 197 | struct inode *btree_inode = root->fs_info->btree_inode; |
5f39d397 CM |
198 | u64 start; |
199 | u64 end; | |
200 | unsigned long index; | |
7c4452b9 CM |
201 | |
202 | if (!trans || !trans->transaction) { | |
203 | return filemap_write_and_wait(btree_inode->i_mapping); | |
204 | } | |
205 | dirty_pages = &trans->transaction->dirty_pages; | |
206 | while(1) { | |
5f39d397 CM |
207 | ret = find_first_extent_bit(dirty_pages, 0, &start, &end, |
208 | EXTENT_DIRTY); | |
209 | if (ret) | |
7c4452b9 | 210 | break; |
5f39d397 CM |
211 | clear_extent_dirty(dirty_pages, start, end, GFP_NOFS); |
212 | while(start <= end) { | |
213 | index = start >> PAGE_CACHE_SHIFT; | |
35ebb934 | 214 | start = (u64)(index + 1) << PAGE_CACHE_SHIFT; |
5f39d397 | 215 | page = find_lock_page(btree_inode->i_mapping, index); |
7c4452b9 CM |
216 | if (!page) |
217 | continue; | |
6702ed49 CM |
218 | if (PageWriteback(page)) { |
219 | if (PageDirty(page)) | |
220 | wait_on_page_writeback(page); | |
221 | else { | |
222 | unlock_page(page); | |
223 | page_cache_release(page); | |
224 | continue; | |
225 | } | |
226 | } | |
7c4452b9 CM |
227 | err = write_one_page(page, 0); |
228 | if (err) | |
229 | werr = err; | |
230 | page_cache_release(page); | |
231 | } | |
232 | } | |
233 | err = filemap_fdatawait(btree_inode->i_mapping); | |
234 | if (err) | |
235 | werr = err; | |
236 | return werr; | |
79154b1b CM |
237 | } |
238 | ||
0b86a832 CM |
239 | static int update_cowonly_root(struct btrfs_trans_handle *trans, |
240 | struct btrfs_root *root) | |
79154b1b CM |
241 | { |
242 | int ret; | |
0b86a832 CM |
243 | u64 old_root_bytenr; |
244 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
79154b1b | 245 | |
0b86a832 | 246 | btrfs_write_dirty_block_groups(trans, root); |
79154b1b | 247 | while(1) { |
0b86a832 CM |
248 | old_root_bytenr = btrfs_root_bytenr(&root->root_item); |
249 | if (old_root_bytenr == root->node->start) | |
79154b1b | 250 | break; |
0b86a832 CM |
251 | btrfs_set_root_bytenr(&root->root_item, |
252 | root->node->start); | |
253 | btrfs_set_root_level(&root->root_item, | |
254 | btrfs_header_level(root->node)); | |
79154b1b | 255 | ret = btrfs_update_root(trans, tree_root, |
0b86a832 CM |
256 | &root->root_key, |
257 | &root->root_item); | |
79154b1b | 258 | BUG_ON(ret); |
0b86a832 CM |
259 | btrfs_write_dirty_block_groups(trans, root); |
260 | } | |
261 | return 0; | |
262 | } | |
263 | ||
264 | int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans, | |
265 | struct btrfs_root *root) | |
266 | { | |
267 | struct btrfs_fs_info *fs_info = root->fs_info; | |
268 | struct list_head *next; | |
269 | ||
270 | while(!list_empty(&fs_info->dirty_cowonly_roots)) { | |
271 | next = fs_info->dirty_cowonly_roots.next; | |
272 | list_del_init(next); | |
273 | root = list_entry(next, struct btrfs_root, dirty_list); | |
274 | update_cowonly_root(trans, root); | |
79154b1b CM |
275 | } |
276 | return 0; | |
277 | } | |
278 | ||
0f7d52f4 CM |
279 | struct dirty_root { |
280 | struct list_head list; | |
0f7d52f4 | 281 | struct btrfs_root *root; |
58176a96 | 282 | struct btrfs_root *latest_root; |
0f7d52f4 CM |
283 | }; |
284 | ||
5ce14bbc CM |
285 | int btrfs_add_dead_root(struct btrfs_root *root, |
286 | struct btrfs_root *latest, | |
287 | struct list_head *dead_list) | |
5eda7b5e CM |
288 | { |
289 | struct dirty_root *dirty; | |
290 | ||
291 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
292 | if (!dirty) | |
293 | return -ENOMEM; | |
5eda7b5e | 294 | dirty->root = root; |
5ce14bbc | 295 | dirty->latest_root = latest; |
5eda7b5e CM |
296 | list_add(&dirty->list, dead_list); |
297 | return 0; | |
298 | } | |
299 | ||
80b6794d CM |
300 | static noinline int add_dirty_roots(struct btrfs_trans_handle *trans, |
301 | struct radix_tree_root *radix, | |
302 | struct list_head *list) | |
0f7d52f4 CM |
303 | { |
304 | struct dirty_root *dirty; | |
305 | struct btrfs_root *gang[8]; | |
306 | struct btrfs_root *root; | |
307 | int i; | |
308 | int ret; | |
54aa1f4d | 309 | int err = 0; |
5eda7b5e | 310 | u32 refs; |
54aa1f4d | 311 | |
0f7d52f4 CM |
312 | while(1) { |
313 | ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0, | |
314 | ARRAY_SIZE(gang), | |
315 | BTRFS_ROOT_TRANS_TAG); | |
316 | if (ret == 0) | |
317 | break; | |
318 | for (i = 0; i < ret; i++) { | |
319 | root = gang[i]; | |
2619ba1f CM |
320 | radix_tree_tag_clear(radix, |
321 | (unsigned long)root->root_key.objectid, | |
322 | BTRFS_ROOT_TRANS_TAG); | |
0f7d52f4 | 323 | if (root->commit_root == root->node) { |
db94535d CM |
324 | WARN_ON(root->node->start != |
325 | btrfs_root_bytenr(&root->root_item)); | |
5f39d397 | 326 | free_extent_buffer(root->commit_root); |
0f7d52f4 | 327 | root->commit_root = NULL; |
58176a96 JB |
328 | |
329 | /* make sure to update the root on disk | |
330 | * so we get any updates to the block used | |
331 | * counts | |
332 | */ | |
333 | err = btrfs_update_root(trans, | |
334 | root->fs_info->tree_root, | |
335 | &root->root_key, | |
336 | &root->root_item); | |
0f7d52f4 CM |
337 | continue; |
338 | } | |
339 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
340 | BUG_ON(!dirty); | |
9f3a7427 CM |
341 | dirty->root = kmalloc(sizeof(*dirty->root), GFP_NOFS); |
342 | BUG_ON(!dirty->root); | |
343 | ||
344 | memset(&root->root_item.drop_progress, 0, | |
345 | sizeof(struct btrfs_disk_key)); | |
346 | root->root_item.drop_level = 0; | |
347 | ||
348 | memcpy(dirty->root, root, sizeof(*root)); | |
349 | dirty->root->node = root->commit_root; | |
58176a96 | 350 | dirty->latest_root = root; |
0f7d52f4 | 351 | root->commit_root = NULL; |
5eda7b5e | 352 | |
0f7d52f4 | 353 | root->root_key.offset = root->fs_info->generation; |
db94535d CM |
354 | btrfs_set_root_bytenr(&root->root_item, |
355 | root->node->start); | |
356 | btrfs_set_root_level(&root->root_item, | |
357 | btrfs_header_level(root->node)); | |
0f7d52f4 CM |
358 | err = btrfs_insert_root(trans, root->fs_info->tree_root, |
359 | &root->root_key, | |
360 | &root->root_item); | |
54aa1f4d CM |
361 | if (err) |
362 | break; | |
9f3a7427 CM |
363 | |
364 | refs = btrfs_root_refs(&dirty->root->root_item); | |
365 | btrfs_set_root_refs(&dirty->root->root_item, refs - 1); | |
5eda7b5e | 366 | err = btrfs_update_root(trans, root->fs_info->tree_root, |
9f3a7427 CM |
367 | &dirty->root->root_key, |
368 | &dirty->root->root_item); | |
5eda7b5e CM |
369 | |
370 | BUG_ON(err); | |
9f3a7427 | 371 | if (refs == 1) { |
5eda7b5e | 372 | list_add(&dirty->list, list); |
9f3a7427 CM |
373 | } else { |
374 | WARN_ON(1); | |
375 | kfree(dirty->root); | |
5eda7b5e | 376 | kfree(dirty); |
9f3a7427 | 377 | } |
0f7d52f4 CM |
378 | } |
379 | } | |
54aa1f4d | 380 | return err; |
0f7d52f4 CM |
381 | } |
382 | ||
e9d0b13b CM |
383 | int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) |
384 | { | |
385 | struct btrfs_fs_info *info = root->fs_info; | |
386 | int ret; | |
387 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 388 | unsigned long nr; |
e9d0b13b | 389 | |
a2135011 | 390 | smp_mb(); |
e9d0b13b CM |
391 | if (root->defrag_running) |
392 | return 0; | |
e9d0b13b | 393 | trans = btrfs_start_transaction(root, 1); |
6b80053d | 394 | while (1) { |
e9d0b13b CM |
395 | root->defrag_running = 1; |
396 | ret = btrfs_defrag_leaves(trans, root, cacheonly); | |
d3c2fdcf | 397 | nr = trans->blocks_used; |
e9d0b13b | 398 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 399 | btrfs_btree_balance_dirty(info->tree_root, nr); |
e9d0b13b CM |
400 | cond_resched(); |
401 | ||
e9d0b13b | 402 | trans = btrfs_start_transaction(root, 1); |
3f157a2f | 403 | if (root->fs_info->closing || ret != -EAGAIN) |
e9d0b13b CM |
404 | break; |
405 | } | |
406 | root->defrag_running = 0; | |
a2135011 | 407 | smp_mb(); |
e9d0b13b CM |
408 | btrfs_end_transaction(trans, root); |
409 | return 0; | |
410 | } | |
411 | ||
80b6794d CM |
412 | static noinline int drop_dirty_roots(struct btrfs_root *tree_root, |
413 | struct list_head *list) | |
0f7d52f4 CM |
414 | { |
415 | struct dirty_root *dirty; | |
416 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 417 | unsigned long nr; |
db94535d CM |
418 | u64 num_bytes; |
419 | u64 bytes_used; | |
54aa1f4d | 420 | int ret = 0; |
9f3a7427 CM |
421 | int err; |
422 | ||
0f7d52f4 | 423 | while(!list_empty(list)) { |
58176a96 JB |
424 | struct btrfs_root *root; |
425 | ||
0f7d52f4 CM |
426 | dirty = list_entry(list->next, struct dirty_root, list); |
427 | list_del_init(&dirty->list); | |
5eda7b5e | 428 | |
db94535d | 429 | num_bytes = btrfs_root_used(&dirty->root->root_item); |
58176a96 | 430 | root = dirty->latest_root; |
a2135011 | 431 | atomic_inc(&root->fs_info->throttles); |
58176a96 | 432 | |
a2135011 | 433 | mutex_lock(&root->fs_info->drop_mutex); |
9f3a7427 CM |
434 | while(1) { |
435 | trans = btrfs_start_transaction(tree_root, 1); | |
436 | ret = btrfs_drop_snapshot(trans, dirty->root); | |
437 | if (ret != -EAGAIN) { | |
438 | break; | |
439 | } | |
58176a96 | 440 | |
9f3a7427 CM |
441 | err = btrfs_update_root(trans, |
442 | tree_root, | |
443 | &dirty->root->root_key, | |
444 | &dirty->root->root_item); | |
445 | if (err) | |
446 | ret = err; | |
d3c2fdcf | 447 | nr = trans->blocks_used; |
1b1e2135 | 448 | ret = btrfs_end_transaction_throttle(trans, tree_root); |
9f3a7427 | 449 | BUG_ON(ret); |
a2135011 CM |
450 | |
451 | mutex_unlock(&root->fs_info->drop_mutex); | |
d3c2fdcf | 452 | btrfs_btree_balance_dirty(tree_root, nr); |
4dc11904 | 453 | cond_resched(); |
a2135011 | 454 | mutex_lock(&root->fs_info->drop_mutex); |
9f3a7427 | 455 | } |
0f7d52f4 | 456 | BUG_ON(ret); |
a2135011 | 457 | atomic_dec(&root->fs_info->throttles); |
58176a96 | 458 | |
a2135011 | 459 | mutex_lock(&root->fs_info->alloc_mutex); |
db94535d CM |
460 | num_bytes -= btrfs_root_used(&dirty->root->root_item); |
461 | bytes_used = btrfs_root_used(&root->root_item); | |
462 | if (num_bytes) { | |
58176a96 | 463 | record_root_in_trans(root); |
5f39d397 | 464 | btrfs_set_root_used(&root->root_item, |
db94535d | 465 | bytes_used - num_bytes); |
58176a96 | 466 | } |
a2135011 CM |
467 | mutex_unlock(&root->fs_info->alloc_mutex); |
468 | ||
9f3a7427 | 469 | ret = btrfs_del_root(trans, tree_root, &dirty->root->root_key); |
58176a96 JB |
470 | if (ret) { |
471 | BUG(); | |
54aa1f4d | 472 | break; |
58176a96 | 473 | } |
a2135011 CM |
474 | mutex_unlock(&root->fs_info->drop_mutex); |
475 | ||
d3c2fdcf | 476 | nr = trans->blocks_used; |
0f7d52f4 CM |
477 | ret = btrfs_end_transaction(trans, tree_root); |
478 | BUG_ON(ret); | |
5eda7b5e | 479 | |
f510cfec | 480 | free_extent_buffer(dirty->root->node); |
9f3a7427 | 481 | kfree(dirty->root); |
0f7d52f4 | 482 | kfree(dirty); |
d3c2fdcf CM |
483 | |
484 | btrfs_btree_balance_dirty(tree_root, nr); | |
4dc11904 | 485 | cond_resched(); |
0f7d52f4 | 486 | } |
54aa1f4d | 487 | return ret; |
0f7d52f4 CM |
488 | } |
489 | ||
80b6794d | 490 | static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, |
3063d29f CM |
491 | struct btrfs_fs_info *fs_info, |
492 | struct btrfs_pending_snapshot *pending) | |
493 | { | |
494 | struct btrfs_key key; | |
80b6794d | 495 | struct btrfs_root_item *new_root_item; |
3063d29f CM |
496 | struct btrfs_root *tree_root = fs_info->tree_root; |
497 | struct btrfs_root *root = pending->root; | |
498 | struct extent_buffer *tmp; | |
925baedd | 499 | struct extent_buffer *old; |
3063d29f | 500 | int ret; |
3b96362c | 501 | int namelen; |
3063d29f CM |
502 | u64 objectid; |
503 | ||
80b6794d CM |
504 | new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS); |
505 | if (!new_root_item) { | |
506 | ret = -ENOMEM; | |
507 | goto fail; | |
508 | } | |
3063d29f CM |
509 | ret = btrfs_find_free_objectid(trans, tree_root, 0, &objectid); |
510 | if (ret) | |
511 | goto fail; | |
512 | ||
80b6794d | 513 | memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); |
3063d29f CM |
514 | |
515 | key.objectid = objectid; | |
516 | key.offset = 1; | |
517 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
518 | ||
925baedd CM |
519 | old = btrfs_lock_root_node(root); |
520 | btrfs_cow_block(trans, root, old, NULL, 0, &old); | |
3063d29f | 521 | |
925baedd CM |
522 | btrfs_copy_root(trans, root, old, &tmp, objectid); |
523 | btrfs_tree_unlock(old); | |
524 | free_extent_buffer(old); | |
3063d29f | 525 | |
80b6794d CM |
526 | btrfs_set_root_bytenr(new_root_item, tmp->start); |
527 | btrfs_set_root_level(new_root_item, btrfs_header_level(tmp)); | |
3063d29f | 528 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
80b6794d | 529 | new_root_item); |
925baedd | 530 | btrfs_tree_unlock(tmp); |
3063d29f CM |
531 | free_extent_buffer(tmp); |
532 | if (ret) | |
533 | goto fail; | |
534 | ||
535 | /* | |
536 | * insert the directory item | |
537 | */ | |
538 | key.offset = (u64)-1; | |
3b96362c | 539 | namelen = strlen(pending->name); |
3063d29f | 540 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, |
3b96362c | 541 | pending->name, namelen, |
3063d29f CM |
542 | root->fs_info->sb->s_root->d_inode->i_ino, |
543 | &key, BTRFS_FT_DIR); | |
544 | ||
545 | if (ret) | |
546 | goto fail; | |
547 | ||
548 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, | |
549 | pending->name, strlen(pending->name), objectid, | |
550 | root->fs_info->sb->s_root->d_inode->i_ino); | |
3b96362c SW |
551 | |
552 | /* Invalidate existing dcache entry for new snapshot. */ | |
553 | btrfs_invalidate_dcache_root(root, pending->name, namelen); | |
554 | ||
3063d29f | 555 | fail: |
80b6794d | 556 | kfree(new_root_item); |
3063d29f CM |
557 | return ret; |
558 | } | |
559 | ||
80b6794d CM |
560 | static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, |
561 | struct btrfs_fs_info *fs_info) | |
3063d29f CM |
562 | { |
563 | struct btrfs_pending_snapshot *pending; | |
564 | struct list_head *head = &trans->transaction->pending_snapshots; | |
565 | int ret; | |
566 | ||
567 | while(!list_empty(head)) { | |
568 | pending = list_entry(head->next, | |
569 | struct btrfs_pending_snapshot, list); | |
570 | ret = create_pending_snapshot(trans, fs_info, pending); | |
571 | BUG_ON(ret); | |
572 | list_del(&pending->list); | |
573 | kfree(pending->name); | |
574 | kfree(pending); | |
575 | } | |
dc17ff8f CM |
576 | return 0; |
577 | } | |
578 | ||
79154b1b CM |
579 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
580 | struct btrfs_root *root) | |
581 | { | |
15ee9bc7 JB |
582 | unsigned long joined = 0; |
583 | unsigned long timeout = 1; | |
79154b1b | 584 | struct btrfs_transaction *cur_trans; |
8fd17795 | 585 | struct btrfs_transaction *prev_trans = NULL; |
0b86a832 | 586 | struct btrfs_root *chunk_root = root->fs_info->chunk_root; |
0f7d52f4 | 587 | struct list_head dirty_fs_roots; |
d1310b2e | 588 | struct extent_io_tree *pinned_copy; |
79154b1b | 589 | DEFINE_WAIT(wait); |
15ee9bc7 | 590 | int ret; |
79154b1b | 591 | |
0f7d52f4 | 592 | INIT_LIST_HEAD(&dirty_fs_roots); |
d6e4a428 | 593 | |
79154b1b CM |
594 | mutex_lock(&root->fs_info->trans_mutex); |
595 | if (trans->transaction->in_commit) { | |
596 | cur_trans = trans->transaction; | |
597 | trans->transaction->use_count++; | |
ccd467d6 | 598 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b | 599 | btrfs_end_transaction(trans, root); |
ccd467d6 | 600 | |
79154b1b CM |
601 | ret = wait_for_commit(root, cur_trans); |
602 | BUG_ON(ret); | |
15ee9bc7 JB |
603 | |
604 | mutex_lock(&root->fs_info->trans_mutex); | |
79154b1b | 605 | put_transaction(cur_trans); |
15ee9bc7 JB |
606 | mutex_unlock(&root->fs_info->trans_mutex); |
607 | ||
79154b1b CM |
608 | return 0; |
609 | } | |
4313b399 CM |
610 | |
611 | pinned_copy = kmalloc(sizeof(*pinned_copy), GFP_NOFS); | |
612 | if (!pinned_copy) | |
613 | return -ENOMEM; | |
614 | ||
d1310b2e | 615 | extent_io_tree_init(pinned_copy, |
4313b399 CM |
616 | root->fs_info->btree_inode->i_mapping, GFP_NOFS); |
617 | ||
e6dcd2dc | 618 | printk("commit trans %Lu\n", trans->transid); |
2c90e5d6 | 619 | trans->transaction->in_commit = 1; |
ccd467d6 CM |
620 | cur_trans = trans->transaction; |
621 | if (cur_trans->list.prev != &root->fs_info->trans_list) { | |
622 | prev_trans = list_entry(cur_trans->list.prev, | |
623 | struct btrfs_transaction, list); | |
624 | if (!prev_trans->commit_done) { | |
625 | prev_trans->use_count++; | |
ccd467d6 CM |
626 | mutex_unlock(&root->fs_info->trans_mutex); |
627 | ||
628 | wait_for_commit(root, prev_trans); | |
ccd467d6 | 629 | |
ccd467d6 | 630 | mutex_lock(&root->fs_info->trans_mutex); |
15ee9bc7 | 631 | put_transaction(prev_trans); |
ccd467d6 CM |
632 | } |
633 | } | |
15ee9bc7 JB |
634 | |
635 | do { | |
636 | joined = cur_trans->num_joined; | |
2c90e5d6 | 637 | WARN_ON(cur_trans != trans->transaction); |
15ee9bc7 | 638 | prepare_to_wait(&cur_trans->writer_wait, &wait, |
79154b1b | 639 | TASK_UNINTERRUPTIBLE); |
15ee9bc7 JB |
640 | |
641 | if (cur_trans->num_writers > 1) | |
642 | timeout = MAX_SCHEDULE_TIMEOUT; | |
643 | else | |
644 | timeout = 1; | |
645 | ||
79154b1b | 646 | mutex_unlock(&root->fs_info->trans_mutex); |
15ee9bc7 JB |
647 | |
648 | schedule_timeout(timeout); | |
649 | ||
79154b1b | 650 | mutex_lock(&root->fs_info->trans_mutex); |
15ee9bc7 JB |
651 | finish_wait(&cur_trans->writer_wait, &wait); |
652 | } while (cur_trans->num_writers > 1 || | |
653 | (cur_trans->num_joined != joined)); | |
654 | ||
3063d29f CM |
655 | ret = create_pending_snapshots(trans, root->fs_info); |
656 | BUG_ON(ret); | |
657 | ||
2c90e5d6 | 658 | WARN_ON(cur_trans != trans->transaction); |
dc17ff8f | 659 | |
54aa1f4d CM |
660 | ret = add_dirty_roots(trans, &root->fs_info->fs_roots_radix, |
661 | &dirty_fs_roots); | |
662 | BUG_ON(ret); | |
663 | ||
79154b1b CM |
664 | ret = btrfs_commit_tree_roots(trans, root); |
665 | BUG_ON(ret); | |
54aa1f4d | 666 | |
78fae27e | 667 | cur_trans = root->fs_info->running_transaction; |
cee36a03 | 668 | spin_lock(&root->fs_info->new_trans_lock); |
78fae27e | 669 | root->fs_info->running_transaction = NULL; |
cee36a03 | 670 | spin_unlock(&root->fs_info->new_trans_lock); |
4b52dff6 CM |
671 | btrfs_set_super_generation(&root->fs_info->super_copy, |
672 | cur_trans->transid); | |
673 | btrfs_set_super_root(&root->fs_info->super_copy, | |
db94535d CM |
674 | root->fs_info->tree_root->node->start); |
675 | btrfs_set_super_root_level(&root->fs_info->super_copy, | |
676 | btrfs_header_level(root->fs_info->tree_root->node)); | |
5f39d397 | 677 | |
0b86a832 CM |
678 | btrfs_set_super_chunk_root(&root->fs_info->super_copy, |
679 | chunk_root->node->start); | |
680 | btrfs_set_super_chunk_root_level(&root->fs_info->super_copy, | |
681 | btrfs_header_level(chunk_root->node)); | |
a061fc8d CM |
682 | memcpy(&root->fs_info->super_for_commit, &root->fs_info->super_copy, |
683 | sizeof(root->fs_info->super_copy)); | |
ccd467d6 | 684 | |
4313b399 | 685 | btrfs_copy_pinned(root, pinned_copy); |
ccd467d6 | 686 | |
e6dcd2dc CM |
687 | wake_up(&root->fs_info->transaction_throttle); |
688 | ||
78fae27e | 689 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b CM |
690 | ret = btrfs_write_and_wait_transaction(trans, root); |
691 | BUG_ON(ret); | |
79154b1b | 692 | write_ctree_super(trans, root); |
4313b399 | 693 | |
4313b399 | 694 | btrfs_finish_extent_commit(trans, root, pinned_copy); |
78fae27e | 695 | mutex_lock(&root->fs_info->trans_mutex); |
4313b399 CM |
696 | |
697 | kfree(pinned_copy); | |
698 | ||
2c90e5d6 | 699 | cur_trans->commit_done = 1; |
15ee9bc7 | 700 | root->fs_info->last_trans_committed = cur_trans->transid; |
2c90e5d6 | 701 | wake_up(&cur_trans->commit_wait); |
78fae27e | 702 | put_transaction(cur_trans); |
79154b1b | 703 | put_transaction(cur_trans); |
58176a96 | 704 | |
facda1e7 CM |
705 | if (root->fs_info->closing) |
706 | list_splice_init(&root->fs_info->dead_roots, &dirty_fs_roots); | |
707 | else | |
708 | list_splice_init(&dirty_fs_roots, &root->fs_info->dead_roots); | |
58176a96 | 709 | |
78fae27e | 710 | mutex_unlock(&root->fs_info->trans_mutex); |
e6dcd2dc | 711 | printk("done commit trans %Lu\n", trans->transid); |
2c90e5d6 | 712 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b | 713 | |
facda1e7 | 714 | if (root->fs_info->closing) { |
facda1e7 | 715 | drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots); |
facda1e7 | 716 | } |
79154b1b CM |
717 | return ret; |
718 | } | |
719 | ||
e9d0b13b CM |
720 | int btrfs_clean_old_snapshots(struct btrfs_root *root) |
721 | { | |
722 | struct list_head dirty_roots; | |
723 | INIT_LIST_HEAD(&dirty_roots); | |
a74a4b97 | 724 | again: |
e9d0b13b CM |
725 | mutex_lock(&root->fs_info->trans_mutex); |
726 | list_splice_init(&root->fs_info->dead_roots, &dirty_roots); | |
727 | mutex_unlock(&root->fs_info->trans_mutex); | |
728 | ||
729 | if (!list_empty(&dirty_roots)) { | |
730 | drop_dirty_roots(root, &dirty_roots); | |
a74a4b97 | 731 | goto again; |
e9d0b13b CM |
732 | } |
733 | return 0; | |
734 | } | |
08607c1b | 735 |