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" |
31153d81 | 27 | #include "ref-cache.h" |
79154b1b | 28 | |
78fae27e | 29 | static int total_trans = 0; |
2c90e5d6 CM |
30 | extern struct kmem_cache *btrfs_trans_handle_cachep; |
31 | extern struct kmem_cache *btrfs_transaction_cachep; | |
32 | ||
0f7d52f4 CM |
33 | #define BTRFS_ROOT_TRANS_TAG 0 |
34 | ||
80b6794d | 35 | static noinline void put_transaction(struct btrfs_transaction *transaction) |
79154b1b | 36 | { |
2c90e5d6 | 37 | WARN_ON(transaction->use_count == 0); |
79154b1b | 38 | transaction->use_count--; |
78fae27e CM |
39 | if (transaction->use_count == 0) { |
40 | WARN_ON(total_trans == 0); | |
41 | total_trans--; | |
8fd17795 | 42 | list_del_init(&transaction->list); |
2c90e5d6 CM |
43 | memset(transaction, 0, sizeof(*transaction)); |
44 | kmem_cache_free(btrfs_transaction_cachep, transaction); | |
78fae27e | 45 | } |
79154b1b CM |
46 | } |
47 | ||
80b6794d | 48 | static noinline int join_transaction(struct btrfs_root *root) |
79154b1b CM |
49 | { |
50 | struct btrfs_transaction *cur_trans; | |
51 | cur_trans = root->fs_info->running_transaction; | |
52 | if (!cur_trans) { | |
2c90e5d6 CM |
53 | cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, |
54 | GFP_NOFS); | |
78fae27e | 55 | total_trans++; |
79154b1b | 56 | BUG_ON(!cur_trans); |
0f7d52f4 | 57 | root->fs_info->generation++; |
e18e4809 | 58 | root->fs_info->last_alloc = 0; |
4529ba49 | 59 | root->fs_info->last_data_alloc = 0; |
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; | |
f9295749 | 66 | cur_trans->blocked = 0; |
d5719762 | 67 | cur_trans->use_count = 1; |
79154b1b | 68 | cur_trans->commit_done = 0; |
08607c1b | 69 | cur_trans->start_time = get_seconds(); |
3063d29f | 70 | INIT_LIST_HEAD(&cur_trans->pending_snapshots); |
8fd17795 | 71 | list_add_tail(&cur_trans->list, &root->fs_info->trans_list); |
d1310b2e | 72 | extent_io_tree_init(&cur_trans->dirty_pages, |
5f39d397 CM |
73 | root->fs_info->btree_inode->i_mapping, |
74 | GFP_NOFS); | |
48ec2cf8 CM |
75 | spin_lock(&root->fs_info->new_trans_lock); |
76 | root->fs_info->running_transaction = cur_trans; | |
77 | spin_unlock(&root->fs_info->new_trans_lock); | |
15ee9bc7 JB |
78 | } else { |
79 | cur_trans->num_writers++; | |
80 | cur_trans->num_joined++; | |
79154b1b | 81 | } |
15ee9bc7 | 82 | |
79154b1b CM |
83 | return 0; |
84 | } | |
85 | ||
80b6794d | 86 | static noinline int record_root_in_trans(struct btrfs_root *root) |
6702ed49 | 87 | { |
f321e491 | 88 | struct btrfs_dirty_root *dirty; |
6702ed49 CM |
89 | u64 running_trans_id = root->fs_info->running_transaction->transid; |
90 | if (root->ref_cows && root->last_trans < running_trans_id) { | |
91 | WARN_ON(root == root->fs_info->extent_root); | |
92 | if (root->root_item.refs != 0) { | |
93 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, | |
94 | (unsigned long)root->root_key.objectid, | |
95 | BTRFS_ROOT_TRANS_TAG); | |
31153d81 YZ |
96 | |
97 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
98 | BUG_ON(!dirty); | |
99 | dirty->root = kmalloc(sizeof(*dirty->root), GFP_NOFS); | |
100 | BUG_ON(!dirty->root); | |
31153d81 YZ |
101 | dirty->latest_root = root; |
102 | INIT_LIST_HEAD(&dirty->list); | |
31153d81 | 103 | |
925baedd | 104 | root->commit_root = btrfs_root_node(root); |
31153d81 YZ |
105 | |
106 | memcpy(dirty->root, root, sizeof(*root)); | |
107 | spin_lock_init(&dirty->root->node_lock); | |
bcc63abb | 108 | spin_lock_init(&dirty->root->list_lock); |
31153d81 | 109 | mutex_init(&dirty->root->objectid_mutex); |
bcc63abb | 110 | INIT_LIST_HEAD(&dirty->root->dead_list); |
31153d81 YZ |
111 | dirty->root->node = root->commit_root; |
112 | dirty->root->commit_root = NULL; | |
bcc63abb Y |
113 | |
114 | spin_lock(&root->list_lock); | |
115 | list_add(&dirty->root->dead_list, &root->dead_list); | |
116 | spin_unlock(&root->list_lock); | |
117 | ||
118 | root->dirty_root = dirty; | |
6702ed49 CM |
119 | } else { |
120 | WARN_ON(1); | |
121 | } | |
122 | root->last_trans = running_trans_id; | |
123 | } | |
124 | return 0; | |
125 | } | |
126 | ||
37d1aeee | 127 | static void wait_current_trans(struct btrfs_root *root) |
79154b1b | 128 | { |
f9295749 | 129 | struct btrfs_transaction *cur_trans; |
79154b1b | 130 | |
f9295749 | 131 | cur_trans = root->fs_info->running_transaction; |
37d1aeee | 132 | if (cur_trans && cur_trans->blocked) { |
f9295749 CM |
133 | DEFINE_WAIT(wait); |
134 | cur_trans->use_count++; | |
135 | while(1) { | |
136 | prepare_to_wait(&root->fs_info->transaction_wait, &wait, | |
137 | TASK_UNINTERRUPTIBLE); | |
138 | if (cur_trans->blocked) { | |
139 | mutex_unlock(&root->fs_info->trans_mutex); | |
140 | schedule(); | |
141 | mutex_lock(&root->fs_info->trans_mutex); | |
142 | finish_wait(&root->fs_info->transaction_wait, | |
143 | &wait); | |
144 | } else { | |
145 | finish_wait(&root->fs_info->transaction_wait, | |
146 | &wait); | |
147 | break; | |
148 | } | |
149 | } | |
150 | put_transaction(cur_trans); | |
151 | } | |
37d1aeee CM |
152 | } |
153 | ||
154 | struct btrfs_trans_handle *start_transaction(struct btrfs_root *root, | |
155 | int num_blocks, int join) | |
156 | { | |
157 | struct btrfs_trans_handle *h = | |
158 | kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); | |
159 | int ret; | |
160 | ||
161 | mutex_lock(&root->fs_info->trans_mutex); | |
162 | if (!join) | |
163 | wait_current_trans(root); | |
79154b1b CM |
164 | ret = join_transaction(root); |
165 | BUG_ON(ret); | |
0f7d52f4 | 166 | |
6702ed49 CM |
167 | record_root_in_trans(root); |
168 | h->transid = root->fs_info->running_transaction->transid; | |
79154b1b CM |
169 | h->transaction = root->fs_info->running_transaction; |
170 | h->blocks_reserved = num_blocks; | |
171 | h->blocks_used = 0; | |
31f3c99b | 172 | h->block_group = NULL; |
26b8003f CM |
173 | h->alloc_exclude_nr = 0; |
174 | h->alloc_exclude_start = 0; | |
79154b1b CM |
175 | root->fs_info->running_transaction->use_count++; |
176 | mutex_unlock(&root->fs_info->trans_mutex); | |
177 | return h; | |
178 | } | |
179 | ||
f9295749 CM |
180 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
181 | int num_blocks) | |
182 | { | |
183 | return start_transaction(root, num_blocks, 0); | |
184 | } | |
185 | struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root, | |
186 | int num_blocks) | |
187 | { | |
188 | return start_transaction(root, num_blocks, 1); | |
189 | } | |
190 | ||
89ce8a63 CM |
191 | static noinline int wait_for_commit(struct btrfs_root *root, |
192 | struct btrfs_transaction *commit) | |
193 | { | |
194 | DEFINE_WAIT(wait); | |
195 | mutex_lock(&root->fs_info->trans_mutex); | |
196 | while(!commit->commit_done) { | |
197 | prepare_to_wait(&commit->commit_wait, &wait, | |
198 | TASK_UNINTERRUPTIBLE); | |
199 | if (commit->commit_done) | |
200 | break; | |
201 | mutex_unlock(&root->fs_info->trans_mutex); | |
202 | schedule(); | |
203 | mutex_lock(&root->fs_info->trans_mutex); | |
204 | } | |
205 | mutex_unlock(&root->fs_info->trans_mutex); | |
206 | finish_wait(&commit->commit_wait, &wait); | |
207 | return 0; | |
208 | } | |
209 | ||
37d1aeee | 210 | static void throttle_on_drops(struct btrfs_root *root) |
ab78c84d CM |
211 | { |
212 | struct btrfs_fs_info *info = root->fs_info; | |
213 | ||
ab78c84d CM |
214 | if (atomic_read(&info->throttles)) { |
215 | DEFINE_WAIT(wait); | |
216 | int thr; | |
ab78c84d CM |
217 | thr = atomic_read(&info->throttle_gen); |
218 | ||
219 | do { | |
220 | prepare_to_wait(&info->transaction_throttle, | |
221 | &wait, TASK_UNINTERRUPTIBLE); | |
222 | if (!atomic_read(&info->throttles)) { | |
223 | finish_wait(&info->transaction_throttle, &wait); | |
224 | break; | |
225 | } | |
226 | schedule(); | |
227 | finish_wait(&info->transaction_throttle, &wait); | |
228 | } while (thr == atomic_read(&info->throttle_gen)); | |
ab78c84d CM |
229 | } |
230 | } | |
231 | ||
37d1aeee CM |
232 | void btrfs_throttle(struct btrfs_root *root) |
233 | { | |
234 | mutex_lock(&root->fs_info->trans_mutex); | |
235 | wait_current_trans(root); | |
236 | mutex_unlock(&root->fs_info->trans_mutex); | |
237 | ||
238 | throttle_on_drops(root); | |
239 | } | |
240 | ||
89ce8a63 CM |
241 | static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, |
242 | struct btrfs_root *root, int throttle) | |
79154b1b CM |
243 | { |
244 | struct btrfs_transaction *cur_trans; | |
ab78c84d | 245 | struct btrfs_fs_info *info = root->fs_info; |
d6e4a428 | 246 | |
ab78c84d CM |
247 | mutex_lock(&info->trans_mutex); |
248 | cur_trans = info->running_transaction; | |
ccd467d6 | 249 | WARN_ON(cur_trans != trans->transaction); |
d5719762 | 250 | WARN_ON(cur_trans->num_writers < 1); |
ccd467d6 | 251 | cur_trans->num_writers--; |
89ce8a63 | 252 | |
79154b1b CM |
253 | if (waitqueue_active(&cur_trans->writer_wait)) |
254 | wake_up(&cur_trans->writer_wait); | |
79154b1b | 255 | put_transaction(cur_trans); |
ab78c84d | 256 | mutex_unlock(&info->trans_mutex); |
d6025579 | 257 | memset(trans, 0, sizeof(*trans)); |
2c90e5d6 | 258 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
ab78c84d CM |
259 | |
260 | if (throttle) | |
37d1aeee | 261 | throttle_on_drops(root); |
ab78c84d | 262 | |
79154b1b CM |
263 | return 0; |
264 | } | |
265 | ||
89ce8a63 CM |
266 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, |
267 | struct btrfs_root *root) | |
268 | { | |
269 | return __btrfs_end_transaction(trans, root, 0); | |
270 | } | |
271 | ||
272 | int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, | |
273 | struct btrfs_root *root) | |
274 | { | |
275 | return __btrfs_end_transaction(trans, root, 1); | |
276 | } | |
277 | ||
79154b1b CM |
278 | |
279 | int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, | |
280 | struct btrfs_root *root) | |
281 | { | |
7c4452b9 | 282 | int ret; |
7c4452b9 CM |
283 | int err; |
284 | int werr = 0; | |
d1310b2e | 285 | struct extent_io_tree *dirty_pages; |
7c4452b9 | 286 | struct page *page; |
7c4452b9 | 287 | struct inode *btree_inode = root->fs_info->btree_inode; |
5f39d397 CM |
288 | u64 start; |
289 | u64 end; | |
290 | unsigned long index; | |
7c4452b9 CM |
291 | |
292 | if (!trans || !trans->transaction) { | |
293 | return filemap_write_and_wait(btree_inode->i_mapping); | |
294 | } | |
295 | dirty_pages = &trans->transaction->dirty_pages; | |
296 | while(1) { | |
5f39d397 CM |
297 | ret = find_first_extent_bit(dirty_pages, 0, &start, &end, |
298 | EXTENT_DIRTY); | |
299 | if (ret) | |
7c4452b9 | 300 | break; |
5f39d397 CM |
301 | clear_extent_dirty(dirty_pages, start, end, GFP_NOFS); |
302 | while(start <= end) { | |
303 | index = start >> PAGE_CACHE_SHIFT; | |
35ebb934 | 304 | start = (u64)(index + 1) << PAGE_CACHE_SHIFT; |
5f39d397 | 305 | page = find_lock_page(btree_inode->i_mapping, index); |
7c4452b9 CM |
306 | if (!page) |
307 | continue; | |
6702ed49 CM |
308 | if (PageWriteback(page)) { |
309 | if (PageDirty(page)) | |
310 | wait_on_page_writeback(page); | |
311 | else { | |
312 | unlock_page(page); | |
313 | page_cache_release(page); | |
314 | continue; | |
315 | } | |
316 | } | |
7c4452b9 CM |
317 | err = write_one_page(page, 0); |
318 | if (err) | |
319 | werr = err; | |
320 | page_cache_release(page); | |
321 | } | |
322 | } | |
323 | err = filemap_fdatawait(btree_inode->i_mapping); | |
324 | if (err) | |
325 | werr = err; | |
326 | return werr; | |
79154b1b CM |
327 | } |
328 | ||
0b86a832 CM |
329 | static int update_cowonly_root(struct btrfs_trans_handle *trans, |
330 | struct btrfs_root *root) | |
79154b1b CM |
331 | { |
332 | int ret; | |
0b86a832 CM |
333 | u64 old_root_bytenr; |
334 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
79154b1b | 335 | |
0b86a832 | 336 | btrfs_write_dirty_block_groups(trans, root); |
79154b1b | 337 | while(1) { |
0b86a832 CM |
338 | old_root_bytenr = btrfs_root_bytenr(&root->root_item); |
339 | if (old_root_bytenr == root->node->start) | |
79154b1b | 340 | break; |
0b86a832 CM |
341 | btrfs_set_root_bytenr(&root->root_item, |
342 | root->node->start); | |
343 | btrfs_set_root_level(&root->root_item, | |
344 | btrfs_header_level(root->node)); | |
79154b1b | 345 | ret = btrfs_update_root(trans, tree_root, |
0b86a832 CM |
346 | &root->root_key, |
347 | &root->root_item); | |
79154b1b | 348 | BUG_ON(ret); |
0b86a832 CM |
349 | btrfs_write_dirty_block_groups(trans, root); |
350 | } | |
351 | return 0; | |
352 | } | |
353 | ||
354 | int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans, | |
355 | struct btrfs_root *root) | |
356 | { | |
357 | struct btrfs_fs_info *fs_info = root->fs_info; | |
358 | struct list_head *next; | |
359 | ||
360 | while(!list_empty(&fs_info->dirty_cowonly_roots)) { | |
361 | next = fs_info->dirty_cowonly_roots.next; | |
362 | list_del_init(next); | |
363 | root = list_entry(next, struct btrfs_root, dirty_list); | |
364 | update_cowonly_root(trans, root); | |
79154b1b CM |
365 | } |
366 | return 0; | |
367 | } | |
368 | ||
5ce14bbc CM |
369 | int btrfs_add_dead_root(struct btrfs_root *root, |
370 | struct btrfs_root *latest, | |
371 | struct list_head *dead_list) | |
5eda7b5e | 372 | { |
f321e491 | 373 | struct btrfs_dirty_root *dirty; |
5eda7b5e CM |
374 | |
375 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
376 | if (!dirty) | |
377 | return -ENOMEM; | |
5eda7b5e | 378 | dirty->root = root; |
5ce14bbc | 379 | dirty->latest_root = latest; |
5eda7b5e CM |
380 | list_add(&dirty->list, dead_list); |
381 | return 0; | |
382 | } | |
383 | ||
80b6794d CM |
384 | static noinline int add_dirty_roots(struct btrfs_trans_handle *trans, |
385 | struct radix_tree_root *radix, | |
386 | struct list_head *list) | |
0f7d52f4 | 387 | { |
f321e491 | 388 | struct btrfs_dirty_root *dirty; |
0f7d52f4 CM |
389 | struct btrfs_root *gang[8]; |
390 | struct btrfs_root *root; | |
391 | int i; | |
392 | int ret; | |
54aa1f4d | 393 | int err = 0; |
5eda7b5e | 394 | u32 refs; |
54aa1f4d | 395 | |
0f7d52f4 CM |
396 | while(1) { |
397 | ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0, | |
398 | ARRAY_SIZE(gang), | |
399 | BTRFS_ROOT_TRANS_TAG); | |
400 | if (ret == 0) | |
401 | break; | |
402 | for (i = 0; i < ret; i++) { | |
403 | root = gang[i]; | |
2619ba1f CM |
404 | radix_tree_tag_clear(radix, |
405 | (unsigned long)root->root_key.objectid, | |
406 | BTRFS_ROOT_TRANS_TAG); | |
31153d81 YZ |
407 | |
408 | BUG_ON(!root->ref_tree); | |
017e5369 | 409 | dirty = root->dirty_root; |
31153d81 | 410 | |
0f7d52f4 | 411 | if (root->commit_root == root->node) { |
db94535d CM |
412 | WARN_ON(root->node->start != |
413 | btrfs_root_bytenr(&root->root_item)); | |
31153d81 | 414 | |
5f39d397 | 415 | free_extent_buffer(root->commit_root); |
0f7d52f4 | 416 | root->commit_root = NULL; |
bcc63abb Y |
417 | |
418 | spin_lock(&root->list_lock); | |
419 | list_del_init(&dirty->root->dead_list); | |
420 | spin_unlock(&root->list_lock); | |
421 | ||
31153d81 YZ |
422 | kfree(dirty->root); |
423 | kfree(dirty); | |
58176a96 JB |
424 | |
425 | /* make sure to update the root on disk | |
426 | * so we get any updates to the block used | |
427 | * counts | |
428 | */ | |
429 | err = btrfs_update_root(trans, | |
430 | root->fs_info->tree_root, | |
431 | &root->root_key, | |
432 | &root->root_item); | |
0f7d52f4 CM |
433 | continue; |
434 | } | |
9f3a7427 CM |
435 | |
436 | memset(&root->root_item.drop_progress, 0, | |
437 | sizeof(struct btrfs_disk_key)); | |
438 | root->root_item.drop_level = 0; | |
0f7d52f4 | 439 | root->commit_root = NULL; |
0f7d52f4 | 440 | root->root_key.offset = root->fs_info->generation; |
db94535d CM |
441 | btrfs_set_root_bytenr(&root->root_item, |
442 | root->node->start); | |
443 | btrfs_set_root_level(&root->root_item, | |
444 | btrfs_header_level(root->node)); | |
0f7d52f4 CM |
445 | err = btrfs_insert_root(trans, root->fs_info->tree_root, |
446 | &root->root_key, | |
447 | &root->root_item); | |
54aa1f4d CM |
448 | if (err) |
449 | break; | |
9f3a7427 CM |
450 | |
451 | refs = btrfs_root_refs(&dirty->root->root_item); | |
452 | btrfs_set_root_refs(&dirty->root->root_item, refs - 1); | |
5eda7b5e | 453 | err = btrfs_update_root(trans, root->fs_info->tree_root, |
9f3a7427 CM |
454 | &dirty->root->root_key, |
455 | &dirty->root->root_item); | |
5eda7b5e CM |
456 | |
457 | BUG_ON(err); | |
9f3a7427 | 458 | if (refs == 1) { |
5eda7b5e | 459 | list_add(&dirty->list, list); |
9f3a7427 CM |
460 | } else { |
461 | WARN_ON(1); | |
31153d81 | 462 | free_extent_buffer(dirty->root->node); |
9f3a7427 | 463 | kfree(dirty->root); |
5eda7b5e | 464 | kfree(dirty); |
9f3a7427 | 465 | } |
0f7d52f4 CM |
466 | } |
467 | } | |
54aa1f4d | 468 | return err; |
0f7d52f4 CM |
469 | } |
470 | ||
e9d0b13b CM |
471 | int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) |
472 | { | |
473 | struct btrfs_fs_info *info = root->fs_info; | |
474 | int ret; | |
475 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 476 | unsigned long nr; |
e9d0b13b | 477 | |
a2135011 | 478 | smp_mb(); |
e9d0b13b CM |
479 | if (root->defrag_running) |
480 | return 0; | |
e9d0b13b | 481 | trans = btrfs_start_transaction(root, 1); |
6b80053d | 482 | while (1) { |
e9d0b13b CM |
483 | root->defrag_running = 1; |
484 | ret = btrfs_defrag_leaves(trans, root, cacheonly); | |
d3c2fdcf | 485 | nr = trans->blocks_used; |
e9d0b13b | 486 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 487 | btrfs_btree_balance_dirty(info->tree_root, nr); |
e9d0b13b CM |
488 | cond_resched(); |
489 | ||
e9d0b13b | 490 | trans = btrfs_start_transaction(root, 1); |
3f157a2f | 491 | if (root->fs_info->closing || ret != -EAGAIN) |
e9d0b13b CM |
492 | break; |
493 | } | |
494 | root->defrag_running = 0; | |
a2135011 | 495 | smp_mb(); |
e9d0b13b CM |
496 | btrfs_end_transaction(trans, root); |
497 | return 0; | |
498 | } | |
499 | ||
80b6794d CM |
500 | static noinline int drop_dirty_roots(struct btrfs_root *tree_root, |
501 | struct list_head *list) | |
0f7d52f4 | 502 | { |
f321e491 | 503 | struct btrfs_dirty_root *dirty; |
0f7d52f4 | 504 | struct btrfs_trans_handle *trans; |
d3c2fdcf | 505 | unsigned long nr; |
db94535d CM |
506 | u64 num_bytes; |
507 | u64 bytes_used; | |
bcc63abb | 508 | u64 max_useless; |
54aa1f4d | 509 | int ret = 0; |
9f3a7427 CM |
510 | int err; |
511 | ||
0f7d52f4 | 512 | while(!list_empty(list)) { |
58176a96 JB |
513 | struct btrfs_root *root; |
514 | ||
f321e491 | 515 | dirty = list_entry(list->prev, struct btrfs_dirty_root, list); |
0f7d52f4 | 516 | list_del_init(&dirty->list); |
5eda7b5e | 517 | |
db94535d | 518 | num_bytes = btrfs_root_used(&dirty->root->root_item); |
58176a96 | 519 | root = dirty->latest_root; |
a2135011 | 520 | atomic_inc(&root->fs_info->throttles); |
58176a96 | 521 | |
a2135011 | 522 | mutex_lock(&root->fs_info->drop_mutex); |
9f3a7427 CM |
523 | while(1) { |
524 | trans = btrfs_start_transaction(tree_root, 1); | |
525 | ret = btrfs_drop_snapshot(trans, dirty->root); | |
526 | if (ret != -EAGAIN) { | |
527 | break; | |
528 | } | |
58176a96 | 529 | |
9f3a7427 CM |
530 | err = btrfs_update_root(trans, |
531 | tree_root, | |
532 | &dirty->root->root_key, | |
533 | &dirty->root->root_item); | |
534 | if (err) | |
535 | ret = err; | |
d3c2fdcf | 536 | nr = trans->blocks_used; |
017e5369 | 537 | ret = btrfs_end_transaction(trans, tree_root); |
9f3a7427 | 538 | BUG_ON(ret); |
a2135011 CM |
539 | |
540 | mutex_unlock(&root->fs_info->drop_mutex); | |
d3c2fdcf | 541 | btrfs_btree_balance_dirty(tree_root, nr); |
4dc11904 | 542 | cond_resched(); |
a2135011 | 543 | mutex_lock(&root->fs_info->drop_mutex); |
9f3a7427 | 544 | } |
0f7d52f4 | 545 | BUG_ON(ret); |
a2135011 | 546 | atomic_dec(&root->fs_info->throttles); |
017e5369 | 547 | wake_up(&root->fs_info->transaction_throttle); |
58176a96 | 548 | |
a2135011 | 549 | mutex_lock(&root->fs_info->alloc_mutex); |
db94535d CM |
550 | num_bytes -= btrfs_root_used(&dirty->root->root_item); |
551 | bytes_used = btrfs_root_used(&root->root_item); | |
552 | if (num_bytes) { | |
58176a96 | 553 | record_root_in_trans(root); |
5f39d397 | 554 | btrfs_set_root_used(&root->root_item, |
db94535d | 555 | bytes_used - num_bytes); |
58176a96 | 556 | } |
a2135011 CM |
557 | mutex_unlock(&root->fs_info->alloc_mutex); |
558 | ||
9f3a7427 | 559 | ret = btrfs_del_root(trans, tree_root, &dirty->root->root_key); |
58176a96 JB |
560 | if (ret) { |
561 | BUG(); | |
54aa1f4d | 562 | break; |
58176a96 | 563 | } |
a2135011 CM |
564 | mutex_unlock(&root->fs_info->drop_mutex); |
565 | ||
bcc63abb Y |
566 | spin_lock(&root->list_lock); |
567 | list_del_init(&dirty->root->dead_list); | |
568 | if (!list_empty(&root->dead_list)) { | |
569 | struct btrfs_root *oldest; | |
570 | oldest = list_entry(root->dead_list.prev, | |
571 | struct btrfs_root, dead_list); | |
572 | max_useless = oldest->root_key.offset - 1; | |
573 | } else { | |
574 | max_useless = root->root_key.offset - 1; | |
575 | } | |
576 | spin_unlock(&root->list_lock); | |
577 | ||
d3c2fdcf | 578 | nr = trans->blocks_used; |
0f7d52f4 CM |
579 | ret = btrfs_end_transaction(trans, tree_root); |
580 | BUG_ON(ret); | |
5eda7b5e | 581 | |
bcc63abb Y |
582 | ret = btrfs_remove_leaf_refs(root, max_useless); |
583 | BUG_ON(ret); | |
584 | ||
f510cfec | 585 | free_extent_buffer(dirty->root->node); |
9f3a7427 | 586 | kfree(dirty->root); |
0f7d52f4 | 587 | kfree(dirty); |
d3c2fdcf CM |
588 | |
589 | btrfs_btree_balance_dirty(tree_root, nr); | |
4dc11904 | 590 | cond_resched(); |
0f7d52f4 | 591 | } |
54aa1f4d | 592 | return ret; |
0f7d52f4 CM |
593 | } |
594 | ||
80b6794d | 595 | static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, |
3063d29f CM |
596 | struct btrfs_fs_info *fs_info, |
597 | struct btrfs_pending_snapshot *pending) | |
598 | { | |
599 | struct btrfs_key key; | |
80b6794d | 600 | struct btrfs_root_item *new_root_item; |
3063d29f CM |
601 | struct btrfs_root *tree_root = fs_info->tree_root; |
602 | struct btrfs_root *root = pending->root; | |
603 | struct extent_buffer *tmp; | |
925baedd | 604 | struct extent_buffer *old; |
3063d29f | 605 | int ret; |
3b96362c | 606 | int namelen; |
3063d29f CM |
607 | u64 objectid; |
608 | ||
80b6794d CM |
609 | new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS); |
610 | if (!new_root_item) { | |
611 | ret = -ENOMEM; | |
612 | goto fail; | |
613 | } | |
3063d29f CM |
614 | ret = btrfs_find_free_objectid(trans, tree_root, 0, &objectid); |
615 | if (ret) | |
616 | goto fail; | |
617 | ||
80b6794d | 618 | memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); |
3063d29f CM |
619 | |
620 | key.objectid = objectid; | |
621 | key.offset = 1; | |
622 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
623 | ||
925baedd | 624 | old = btrfs_lock_root_node(root); |
65b51a00 | 625 | btrfs_cow_block(trans, root, old, NULL, 0, &old, 0); |
3063d29f | 626 | |
925baedd CM |
627 | btrfs_copy_root(trans, root, old, &tmp, objectid); |
628 | btrfs_tree_unlock(old); | |
629 | free_extent_buffer(old); | |
3063d29f | 630 | |
80b6794d CM |
631 | btrfs_set_root_bytenr(new_root_item, tmp->start); |
632 | btrfs_set_root_level(new_root_item, btrfs_header_level(tmp)); | |
3063d29f | 633 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
80b6794d | 634 | new_root_item); |
925baedd | 635 | btrfs_tree_unlock(tmp); |
3063d29f CM |
636 | free_extent_buffer(tmp); |
637 | if (ret) | |
638 | goto fail; | |
639 | ||
640 | /* | |
641 | * insert the directory item | |
642 | */ | |
643 | key.offset = (u64)-1; | |
3b96362c | 644 | namelen = strlen(pending->name); |
3063d29f | 645 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, |
3b96362c | 646 | pending->name, namelen, |
3063d29f | 647 | root->fs_info->sb->s_root->d_inode->i_ino, |
aec7477b | 648 | &key, BTRFS_FT_DIR, 0); |
3063d29f CM |
649 | |
650 | if (ret) | |
651 | goto fail; | |
652 | ||
653 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, | |
654 | pending->name, strlen(pending->name), objectid, | |
aec7477b | 655 | root->fs_info->sb->s_root->d_inode->i_ino, 0); |
3b96362c SW |
656 | |
657 | /* Invalidate existing dcache entry for new snapshot. */ | |
658 | btrfs_invalidate_dcache_root(root, pending->name, namelen); | |
659 | ||
3063d29f | 660 | fail: |
80b6794d | 661 | kfree(new_root_item); |
3063d29f CM |
662 | return ret; |
663 | } | |
664 | ||
80b6794d CM |
665 | static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, |
666 | struct btrfs_fs_info *fs_info) | |
3063d29f CM |
667 | { |
668 | struct btrfs_pending_snapshot *pending; | |
669 | struct list_head *head = &trans->transaction->pending_snapshots; | |
670 | int ret; | |
671 | ||
672 | while(!list_empty(head)) { | |
673 | pending = list_entry(head->next, | |
674 | struct btrfs_pending_snapshot, list); | |
675 | ret = create_pending_snapshot(trans, fs_info, pending); | |
676 | BUG_ON(ret); | |
677 | list_del(&pending->list); | |
678 | kfree(pending->name); | |
679 | kfree(pending); | |
680 | } | |
dc17ff8f CM |
681 | return 0; |
682 | } | |
683 | ||
79154b1b CM |
684 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
685 | struct btrfs_root *root) | |
686 | { | |
15ee9bc7 JB |
687 | unsigned long joined = 0; |
688 | unsigned long timeout = 1; | |
79154b1b | 689 | struct btrfs_transaction *cur_trans; |
8fd17795 | 690 | struct btrfs_transaction *prev_trans = NULL; |
0b86a832 | 691 | struct btrfs_root *chunk_root = root->fs_info->chunk_root; |
0f7d52f4 | 692 | struct list_head dirty_fs_roots; |
d1310b2e | 693 | struct extent_io_tree *pinned_copy; |
79154b1b | 694 | DEFINE_WAIT(wait); |
15ee9bc7 | 695 | int ret; |
79154b1b | 696 | |
0f7d52f4 | 697 | INIT_LIST_HEAD(&dirty_fs_roots); |
d6e4a428 | 698 | |
79154b1b CM |
699 | mutex_lock(&root->fs_info->trans_mutex); |
700 | if (trans->transaction->in_commit) { | |
701 | cur_trans = trans->transaction; | |
702 | trans->transaction->use_count++; | |
ccd467d6 | 703 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b | 704 | btrfs_end_transaction(trans, root); |
ccd467d6 | 705 | |
79154b1b CM |
706 | ret = wait_for_commit(root, cur_trans); |
707 | BUG_ON(ret); | |
15ee9bc7 JB |
708 | |
709 | mutex_lock(&root->fs_info->trans_mutex); | |
79154b1b | 710 | put_transaction(cur_trans); |
15ee9bc7 JB |
711 | mutex_unlock(&root->fs_info->trans_mutex); |
712 | ||
79154b1b CM |
713 | return 0; |
714 | } | |
4313b399 CM |
715 | |
716 | pinned_copy = kmalloc(sizeof(*pinned_copy), GFP_NOFS); | |
717 | if (!pinned_copy) | |
718 | return -ENOMEM; | |
719 | ||
d1310b2e | 720 | extent_io_tree_init(pinned_copy, |
4313b399 CM |
721 | root->fs_info->btree_inode->i_mapping, GFP_NOFS); |
722 | ||
2c90e5d6 | 723 | trans->transaction->in_commit = 1; |
f9295749 | 724 | trans->transaction->blocked = 1; |
ccd467d6 CM |
725 | cur_trans = trans->transaction; |
726 | if (cur_trans->list.prev != &root->fs_info->trans_list) { | |
727 | prev_trans = list_entry(cur_trans->list.prev, | |
728 | struct btrfs_transaction, list); | |
729 | if (!prev_trans->commit_done) { | |
730 | prev_trans->use_count++; | |
ccd467d6 CM |
731 | mutex_unlock(&root->fs_info->trans_mutex); |
732 | ||
733 | wait_for_commit(root, prev_trans); | |
ccd467d6 | 734 | |
ccd467d6 | 735 | mutex_lock(&root->fs_info->trans_mutex); |
15ee9bc7 | 736 | put_transaction(prev_trans); |
ccd467d6 CM |
737 | } |
738 | } | |
15ee9bc7 JB |
739 | |
740 | do { | |
741 | joined = cur_trans->num_joined; | |
2c90e5d6 | 742 | WARN_ON(cur_trans != trans->transaction); |
15ee9bc7 | 743 | prepare_to_wait(&cur_trans->writer_wait, &wait, |
79154b1b | 744 | TASK_UNINTERRUPTIBLE); |
15ee9bc7 JB |
745 | |
746 | if (cur_trans->num_writers > 1) | |
747 | timeout = MAX_SCHEDULE_TIMEOUT; | |
748 | else | |
749 | timeout = 1; | |
750 | ||
79154b1b | 751 | mutex_unlock(&root->fs_info->trans_mutex); |
15ee9bc7 JB |
752 | |
753 | schedule_timeout(timeout); | |
754 | ||
79154b1b | 755 | mutex_lock(&root->fs_info->trans_mutex); |
15ee9bc7 JB |
756 | finish_wait(&cur_trans->writer_wait, &wait); |
757 | } while (cur_trans->num_writers > 1 || | |
758 | (cur_trans->num_joined != joined)); | |
759 | ||
3063d29f CM |
760 | ret = create_pending_snapshots(trans, root->fs_info); |
761 | BUG_ON(ret); | |
762 | ||
2c90e5d6 | 763 | WARN_ON(cur_trans != trans->transaction); |
dc17ff8f | 764 | |
54aa1f4d CM |
765 | ret = add_dirty_roots(trans, &root->fs_info->fs_roots_radix, |
766 | &dirty_fs_roots); | |
767 | BUG_ON(ret); | |
768 | ||
79154b1b CM |
769 | ret = btrfs_commit_tree_roots(trans, root); |
770 | BUG_ON(ret); | |
54aa1f4d | 771 | |
78fae27e | 772 | cur_trans = root->fs_info->running_transaction; |
cee36a03 | 773 | spin_lock(&root->fs_info->new_trans_lock); |
78fae27e | 774 | root->fs_info->running_transaction = NULL; |
cee36a03 | 775 | spin_unlock(&root->fs_info->new_trans_lock); |
4b52dff6 CM |
776 | btrfs_set_super_generation(&root->fs_info->super_copy, |
777 | cur_trans->transid); | |
778 | btrfs_set_super_root(&root->fs_info->super_copy, | |
db94535d CM |
779 | root->fs_info->tree_root->node->start); |
780 | btrfs_set_super_root_level(&root->fs_info->super_copy, | |
781 | btrfs_header_level(root->fs_info->tree_root->node)); | |
5f39d397 | 782 | |
0b86a832 CM |
783 | btrfs_set_super_chunk_root(&root->fs_info->super_copy, |
784 | chunk_root->node->start); | |
785 | btrfs_set_super_chunk_root_level(&root->fs_info->super_copy, | |
786 | btrfs_header_level(chunk_root->node)); | |
a061fc8d CM |
787 | memcpy(&root->fs_info->super_for_commit, &root->fs_info->super_copy, |
788 | sizeof(root->fs_info->super_copy)); | |
ccd467d6 | 789 | |
4313b399 | 790 | btrfs_copy_pinned(root, pinned_copy); |
ccd467d6 | 791 | |
f9295749 | 792 | trans->transaction->blocked = 0; |
e6dcd2dc | 793 | wake_up(&root->fs_info->transaction_throttle); |
f9295749 | 794 | wake_up(&root->fs_info->transaction_wait); |
e6dcd2dc | 795 | |
78fae27e | 796 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b CM |
797 | ret = btrfs_write_and_wait_transaction(trans, root); |
798 | BUG_ON(ret); | |
79154b1b | 799 | write_ctree_super(trans, root); |
4313b399 | 800 | |
4313b399 | 801 | btrfs_finish_extent_commit(trans, root, pinned_copy); |
78fae27e | 802 | mutex_lock(&root->fs_info->trans_mutex); |
4313b399 CM |
803 | |
804 | kfree(pinned_copy); | |
805 | ||
2c90e5d6 | 806 | cur_trans->commit_done = 1; |
15ee9bc7 | 807 | root->fs_info->last_trans_committed = cur_trans->transid; |
2c90e5d6 | 808 | wake_up(&cur_trans->commit_wait); |
78fae27e | 809 | put_transaction(cur_trans); |
79154b1b | 810 | put_transaction(cur_trans); |
58176a96 | 811 | |
bcc63abb | 812 | list_splice_init(&dirty_fs_roots, &root->fs_info->dead_roots); |
facda1e7 CM |
813 | if (root->fs_info->closing) |
814 | list_splice_init(&root->fs_info->dead_roots, &dirty_fs_roots); | |
58176a96 | 815 | |
78fae27e | 816 | mutex_unlock(&root->fs_info->trans_mutex); |
2c90e5d6 | 817 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b | 818 | |
facda1e7 | 819 | if (root->fs_info->closing) { |
facda1e7 | 820 | drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots); |
facda1e7 | 821 | } |
79154b1b CM |
822 | return ret; |
823 | } | |
824 | ||
e9d0b13b CM |
825 | int btrfs_clean_old_snapshots(struct btrfs_root *root) |
826 | { | |
827 | struct list_head dirty_roots; | |
828 | INIT_LIST_HEAD(&dirty_roots); | |
a74a4b97 | 829 | again: |
e9d0b13b CM |
830 | mutex_lock(&root->fs_info->trans_mutex); |
831 | list_splice_init(&root->fs_info->dead_roots, &dirty_roots); | |
832 | mutex_unlock(&root->fs_info->trans_mutex); | |
833 | ||
834 | if (!list_empty(&dirty_roots)) { | |
835 | drop_dirty_roots(root, &dirty_roots); | |
a74a4b97 | 836 | goto again; |
e9d0b13b CM |
837 | } |
838 | return 0; | |
839 | } |