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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 | 32 | #define BTRFS_ROOT_TRANS_TAG 0 |
6702ed49 | 33 | #define BTRFS_ROOT_DEFRAG_TAG 1 |
0f7d52f4 | 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; | |
d5719762 | 66 | cur_trans->use_count = 1; |
79154b1b | 67 | cur_trans->commit_done = 0; |
08607c1b | 68 | cur_trans->start_time = get_seconds(); |
3063d29f | 69 | INIT_LIST_HEAD(&cur_trans->pending_snapshots); |
8fd17795 | 70 | list_add_tail(&cur_trans->list, &root->fs_info->trans_list); |
dc17ff8f | 71 | btrfs_ordered_inode_tree_init(&cur_trans->ordered_inode_tree); |
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 CM |
87 | { |
88 | u64 running_trans_id = root->fs_info->running_transaction->transid; | |
89 | if (root->ref_cows && root->last_trans < running_trans_id) { | |
90 | WARN_ON(root == root->fs_info->extent_root); | |
91 | if (root->root_item.refs != 0) { | |
92 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, | |
93 | (unsigned long)root->root_key.objectid, | |
94 | BTRFS_ROOT_TRANS_TAG); | |
95 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, | |
96 | (unsigned long)root->root_key.objectid, | |
97 | BTRFS_ROOT_DEFRAG_TAG); | |
925baedd | 98 | root->commit_root = btrfs_root_node(root); |
6702ed49 CM |
99 | } else { |
100 | WARN_ON(1); | |
101 | } | |
102 | root->last_trans = running_trans_id; | |
103 | } | |
104 | return 0; | |
105 | } | |
106 | ||
79154b1b CM |
107 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
108 | int num_blocks) | |
109 | { | |
2c90e5d6 CM |
110 | struct btrfs_trans_handle *h = |
111 | kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); | |
79154b1b CM |
112 | int ret; |
113 | ||
114 | mutex_lock(&root->fs_info->trans_mutex); | |
115 | ret = join_transaction(root); | |
116 | BUG_ON(ret); | |
0f7d52f4 | 117 | |
6702ed49 CM |
118 | record_root_in_trans(root); |
119 | h->transid = root->fs_info->running_transaction->transid; | |
79154b1b CM |
120 | h->transaction = root->fs_info->running_transaction; |
121 | h->blocks_reserved = num_blocks; | |
122 | h->blocks_used = 0; | |
31f3c99b | 123 | h->block_group = NULL; |
26b8003f CM |
124 | h->alloc_exclude_nr = 0; |
125 | h->alloc_exclude_start = 0; | |
79154b1b CM |
126 | root->fs_info->running_transaction->use_count++; |
127 | mutex_unlock(&root->fs_info->trans_mutex); | |
128 | return h; | |
129 | } | |
130 | ||
89ce8a63 CM |
131 | static noinline int wait_for_commit(struct btrfs_root *root, |
132 | struct btrfs_transaction *commit) | |
133 | { | |
134 | DEFINE_WAIT(wait); | |
135 | mutex_lock(&root->fs_info->trans_mutex); | |
136 | while(!commit->commit_done) { | |
137 | prepare_to_wait(&commit->commit_wait, &wait, | |
138 | TASK_UNINTERRUPTIBLE); | |
139 | if (commit->commit_done) | |
140 | break; | |
141 | mutex_unlock(&root->fs_info->trans_mutex); | |
142 | schedule(); | |
143 | mutex_lock(&root->fs_info->trans_mutex); | |
144 | } | |
145 | mutex_unlock(&root->fs_info->trans_mutex); | |
146 | finish_wait(&commit->commit_wait, &wait); | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, | |
151 | struct btrfs_root *root, int throttle) | |
79154b1b CM |
152 | { |
153 | struct btrfs_transaction *cur_trans; | |
d6e4a428 | 154 | |
79154b1b CM |
155 | mutex_lock(&root->fs_info->trans_mutex); |
156 | cur_trans = root->fs_info->running_transaction; | |
ccd467d6 | 157 | WARN_ON(cur_trans != trans->transaction); |
d5719762 | 158 | WARN_ON(cur_trans->num_writers < 1); |
ccd467d6 | 159 | cur_trans->num_writers--; |
89ce8a63 | 160 | |
79154b1b CM |
161 | if (waitqueue_active(&cur_trans->writer_wait)) |
162 | wake_up(&cur_trans->writer_wait); | |
89ce8a63 CM |
163 | |
164 | if (cur_trans->in_commit && throttle) { | |
165 | int ret; | |
166 | mutex_unlock(&root->fs_info->trans_mutex); | |
167 | ret = wait_for_commit(root, cur_trans); | |
168 | BUG_ON(ret); | |
169 | mutex_lock(&root->fs_info->trans_mutex); | |
170 | } | |
171 | ||
79154b1b CM |
172 | put_transaction(cur_trans); |
173 | mutex_unlock(&root->fs_info->trans_mutex); | |
d6025579 | 174 | memset(trans, 0, sizeof(*trans)); |
2c90e5d6 | 175 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b CM |
176 | return 0; |
177 | } | |
178 | ||
89ce8a63 CM |
179 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, |
180 | struct btrfs_root *root) | |
181 | { | |
182 | return __btrfs_end_transaction(trans, root, 0); | |
183 | } | |
184 | ||
185 | int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, | |
186 | struct btrfs_root *root) | |
187 | { | |
188 | return __btrfs_end_transaction(trans, root, 1); | |
189 | } | |
190 | ||
79154b1b CM |
191 | |
192 | int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, | |
193 | struct btrfs_root *root) | |
194 | { | |
7c4452b9 | 195 | int ret; |
7c4452b9 CM |
196 | int err; |
197 | int werr = 0; | |
d1310b2e | 198 | struct extent_io_tree *dirty_pages; |
7c4452b9 | 199 | struct page *page; |
7c4452b9 | 200 | struct inode *btree_inode = root->fs_info->btree_inode; |
5f39d397 CM |
201 | u64 start; |
202 | u64 end; | |
203 | unsigned long index; | |
7c4452b9 CM |
204 | |
205 | if (!trans || !trans->transaction) { | |
206 | return filemap_write_and_wait(btree_inode->i_mapping); | |
207 | } | |
208 | dirty_pages = &trans->transaction->dirty_pages; | |
209 | while(1) { | |
5f39d397 CM |
210 | ret = find_first_extent_bit(dirty_pages, 0, &start, &end, |
211 | EXTENT_DIRTY); | |
212 | if (ret) | |
7c4452b9 | 213 | break; |
5f39d397 CM |
214 | clear_extent_dirty(dirty_pages, start, end, GFP_NOFS); |
215 | while(start <= end) { | |
216 | index = start >> PAGE_CACHE_SHIFT; | |
35ebb934 | 217 | start = (u64)(index + 1) << PAGE_CACHE_SHIFT; |
5f39d397 | 218 | page = find_lock_page(btree_inode->i_mapping, index); |
7c4452b9 CM |
219 | if (!page) |
220 | continue; | |
6702ed49 CM |
221 | if (PageWriteback(page)) { |
222 | if (PageDirty(page)) | |
223 | wait_on_page_writeback(page); | |
224 | else { | |
225 | unlock_page(page); | |
226 | page_cache_release(page); | |
227 | continue; | |
228 | } | |
229 | } | |
7c4452b9 CM |
230 | err = write_one_page(page, 0); |
231 | if (err) | |
232 | werr = err; | |
233 | page_cache_release(page); | |
234 | } | |
235 | } | |
236 | err = filemap_fdatawait(btree_inode->i_mapping); | |
237 | if (err) | |
238 | werr = err; | |
239 | return werr; | |
79154b1b CM |
240 | } |
241 | ||
0b86a832 CM |
242 | static int update_cowonly_root(struct btrfs_trans_handle *trans, |
243 | struct btrfs_root *root) | |
79154b1b CM |
244 | { |
245 | int ret; | |
0b86a832 CM |
246 | u64 old_root_bytenr; |
247 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
79154b1b | 248 | |
0b86a832 | 249 | btrfs_write_dirty_block_groups(trans, root); |
79154b1b | 250 | while(1) { |
0b86a832 CM |
251 | old_root_bytenr = btrfs_root_bytenr(&root->root_item); |
252 | if (old_root_bytenr == root->node->start) | |
79154b1b | 253 | break; |
0b86a832 CM |
254 | btrfs_set_root_bytenr(&root->root_item, |
255 | root->node->start); | |
256 | btrfs_set_root_level(&root->root_item, | |
257 | btrfs_header_level(root->node)); | |
79154b1b | 258 | ret = btrfs_update_root(trans, tree_root, |
0b86a832 CM |
259 | &root->root_key, |
260 | &root->root_item); | |
79154b1b | 261 | BUG_ON(ret); |
0b86a832 CM |
262 | btrfs_write_dirty_block_groups(trans, root); |
263 | } | |
264 | return 0; | |
265 | } | |
266 | ||
267 | int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans, | |
268 | struct btrfs_root *root) | |
269 | { | |
270 | struct btrfs_fs_info *fs_info = root->fs_info; | |
271 | struct list_head *next; | |
272 | ||
273 | while(!list_empty(&fs_info->dirty_cowonly_roots)) { | |
274 | next = fs_info->dirty_cowonly_roots.next; | |
275 | list_del_init(next); | |
276 | root = list_entry(next, struct btrfs_root, dirty_list); | |
277 | update_cowonly_root(trans, root); | |
79154b1b CM |
278 | } |
279 | return 0; | |
280 | } | |
281 | ||
0f7d52f4 CM |
282 | struct dirty_root { |
283 | struct list_head list; | |
0f7d52f4 | 284 | struct btrfs_root *root; |
58176a96 | 285 | struct btrfs_root *latest_root; |
0f7d52f4 CM |
286 | }; |
287 | ||
5ce14bbc CM |
288 | int btrfs_add_dead_root(struct btrfs_root *root, |
289 | struct btrfs_root *latest, | |
290 | struct list_head *dead_list) | |
5eda7b5e CM |
291 | { |
292 | struct dirty_root *dirty; | |
293 | ||
294 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
295 | if (!dirty) | |
296 | return -ENOMEM; | |
5eda7b5e | 297 | dirty->root = root; |
5ce14bbc | 298 | dirty->latest_root = latest; |
5eda7b5e CM |
299 | list_add(&dirty->list, dead_list); |
300 | return 0; | |
301 | } | |
302 | ||
80b6794d CM |
303 | static noinline int add_dirty_roots(struct btrfs_trans_handle *trans, |
304 | struct radix_tree_root *radix, | |
305 | struct list_head *list) | |
0f7d52f4 CM |
306 | { |
307 | struct dirty_root *dirty; | |
308 | struct btrfs_root *gang[8]; | |
309 | struct btrfs_root *root; | |
310 | int i; | |
311 | int ret; | |
54aa1f4d | 312 | int err = 0; |
5eda7b5e | 313 | u32 refs; |
54aa1f4d | 314 | |
0f7d52f4 CM |
315 | while(1) { |
316 | ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0, | |
317 | ARRAY_SIZE(gang), | |
318 | BTRFS_ROOT_TRANS_TAG); | |
319 | if (ret == 0) | |
320 | break; | |
321 | for (i = 0; i < ret; i++) { | |
322 | root = gang[i]; | |
2619ba1f CM |
323 | radix_tree_tag_clear(radix, |
324 | (unsigned long)root->root_key.objectid, | |
325 | BTRFS_ROOT_TRANS_TAG); | |
0f7d52f4 | 326 | if (root->commit_root == root->node) { |
db94535d CM |
327 | WARN_ON(root->node->start != |
328 | btrfs_root_bytenr(&root->root_item)); | |
5f39d397 | 329 | free_extent_buffer(root->commit_root); |
0f7d52f4 | 330 | root->commit_root = NULL; |
58176a96 JB |
331 | |
332 | /* make sure to update the root on disk | |
333 | * so we get any updates to the block used | |
334 | * counts | |
335 | */ | |
336 | err = btrfs_update_root(trans, | |
337 | root->fs_info->tree_root, | |
338 | &root->root_key, | |
339 | &root->root_item); | |
0f7d52f4 CM |
340 | continue; |
341 | } | |
342 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
343 | BUG_ON(!dirty); | |
9f3a7427 CM |
344 | dirty->root = kmalloc(sizeof(*dirty->root), GFP_NOFS); |
345 | BUG_ON(!dirty->root); | |
346 | ||
347 | memset(&root->root_item.drop_progress, 0, | |
348 | sizeof(struct btrfs_disk_key)); | |
349 | root->root_item.drop_level = 0; | |
350 | ||
351 | memcpy(dirty->root, root, sizeof(*root)); | |
352 | dirty->root->node = root->commit_root; | |
58176a96 | 353 | dirty->latest_root = root; |
0f7d52f4 | 354 | root->commit_root = NULL; |
5eda7b5e | 355 | |
0f7d52f4 | 356 | root->root_key.offset = root->fs_info->generation; |
db94535d CM |
357 | btrfs_set_root_bytenr(&root->root_item, |
358 | root->node->start); | |
359 | btrfs_set_root_level(&root->root_item, | |
360 | btrfs_header_level(root->node)); | |
0f7d52f4 CM |
361 | err = btrfs_insert_root(trans, root->fs_info->tree_root, |
362 | &root->root_key, | |
363 | &root->root_item); | |
54aa1f4d CM |
364 | if (err) |
365 | break; | |
9f3a7427 CM |
366 | |
367 | refs = btrfs_root_refs(&dirty->root->root_item); | |
368 | btrfs_set_root_refs(&dirty->root->root_item, refs - 1); | |
5eda7b5e | 369 | err = btrfs_update_root(trans, root->fs_info->tree_root, |
9f3a7427 CM |
370 | &dirty->root->root_key, |
371 | &dirty->root->root_item); | |
5eda7b5e CM |
372 | |
373 | BUG_ON(err); | |
9f3a7427 | 374 | if (refs == 1) { |
5eda7b5e | 375 | list_add(&dirty->list, list); |
9f3a7427 CM |
376 | } else { |
377 | WARN_ON(1); | |
378 | kfree(dirty->root); | |
5eda7b5e | 379 | kfree(dirty); |
9f3a7427 | 380 | } |
0f7d52f4 CM |
381 | } |
382 | } | |
54aa1f4d | 383 | return err; |
0f7d52f4 CM |
384 | } |
385 | ||
e9d0b13b CM |
386 | int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) |
387 | { | |
388 | struct btrfs_fs_info *info = root->fs_info; | |
389 | int ret; | |
390 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 391 | unsigned long nr; |
e9d0b13b | 392 | |
a2135011 | 393 | smp_mb(); |
e9d0b13b CM |
394 | if (root->defrag_running) |
395 | return 0; | |
e9d0b13b | 396 | trans = btrfs_start_transaction(root, 1); |
6b80053d | 397 | while (1) { |
e9d0b13b CM |
398 | root->defrag_running = 1; |
399 | ret = btrfs_defrag_leaves(trans, root, cacheonly); | |
d3c2fdcf | 400 | nr = trans->blocks_used; |
e9d0b13b | 401 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 402 | btrfs_btree_balance_dirty(info->tree_root, nr); |
e9d0b13b CM |
403 | cond_resched(); |
404 | ||
e9d0b13b CM |
405 | trans = btrfs_start_transaction(root, 1); |
406 | if (ret != -EAGAIN) | |
407 | break; | |
408 | } | |
409 | root->defrag_running = 0; | |
a2135011 | 410 | smp_mb(); |
e9d0b13b CM |
411 | radix_tree_tag_clear(&info->fs_roots_radix, |
412 | (unsigned long)root->root_key.objectid, | |
413 | BTRFS_ROOT_DEFRAG_TAG); | |
414 | btrfs_end_transaction(trans, root); | |
415 | return 0; | |
416 | } | |
417 | ||
6702ed49 CM |
418 | int btrfs_defrag_dirty_roots(struct btrfs_fs_info *info) |
419 | { | |
420 | struct btrfs_root *gang[1]; | |
421 | struct btrfs_root *root; | |
6702ed49 CM |
422 | int i; |
423 | int ret; | |
424 | int err = 0; | |
425 | u64 last = 0; | |
426 | ||
6702ed49 CM |
427 | while(1) { |
428 | ret = radix_tree_gang_lookup_tag(&info->fs_roots_radix, | |
429 | (void **)gang, last, | |
430 | ARRAY_SIZE(gang), | |
431 | BTRFS_ROOT_DEFRAG_TAG); | |
432 | if (ret == 0) | |
433 | break; | |
434 | for (i = 0; i < ret; i++) { | |
435 | root = gang[i]; | |
436 | last = root->root_key.objectid + 1; | |
f510cfec | 437 | btrfs_defrag_root(root, 1); |
6702ed49 CM |
438 | } |
439 | } | |
6b80053d | 440 | btrfs_defrag_root(info->extent_root, 1); |
6702ed49 CM |
441 | return err; |
442 | } | |
443 | ||
80b6794d CM |
444 | static noinline int drop_dirty_roots(struct btrfs_root *tree_root, |
445 | struct list_head *list) | |
0f7d52f4 CM |
446 | { |
447 | struct dirty_root *dirty; | |
448 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 449 | unsigned long nr; |
db94535d CM |
450 | u64 num_bytes; |
451 | u64 bytes_used; | |
54aa1f4d | 452 | int ret = 0; |
9f3a7427 CM |
453 | int err; |
454 | ||
0f7d52f4 | 455 | while(!list_empty(list)) { |
58176a96 JB |
456 | struct btrfs_root *root; |
457 | ||
0f7d52f4 CM |
458 | dirty = list_entry(list->next, struct dirty_root, list); |
459 | list_del_init(&dirty->list); | |
5eda7b5e | 460 | |
db94535d | 461 | num_bytes = btrfs_root_used(&dirty->root->root_item); |
58176a96 | 462 | root = dirty->latest_root; |
a2135011 | 463 | atomic_inc(&root->fs_info->throttles); |
58176a96 | 464 | |
a2135011 | 465 | mutex_lock(&root->fs_info->drop_mutex); |
9f3a7427 CM |
466 | while(1) { |
467 | trans = btrfs_start_transaction(tree_root, 1); | |
468 | ret = btrfs_drop_snapshot(trans, dirty->root); | |
469 | if (ret != -EAGAIN) { | |
470 | break; | |
471 | } | |
58176a96 | 472 | |
9f3a7427 CM |
473 | err = btrfs_update_root(trans, |
474 | tree_root, | |
475 | &dirty->root->root_key, | |
476 | &dirty->root->root_item); | |
477 | if (err) | |
478 | ret = err; | |
d3c2fdcf | 479 | nr = trans->blocks_used; |
1b1e2135 | 480 | ret = btrfs_end_transaction_throttle(trans, tree_root); |
9f3a7427 | 481 | BUG_ON(ret); |
a2135011 CM |
482 | |
483 | mutex_unlock(&root->fs_info->drop_mutex); | |
d3c2fdcf | 484 | btrfs_btree_balance_dirty(tree_root, nr); |
4dc11904 | 485 | cond_resched(); |
a2135011 | 486 | mutex_lock(&root->fs_info->drop_mutex); |
9f3a7427 | 487 | } |
0f7d52f4 | 488 | BUG_ON(ret); |
a2135011 | 489 | atomic_dec(&root->fs_info->throttles); |
58176a96 | 490 | |
a2135011 | 491 | mutex_lock(&root->fs_info->alloc_mutex); |
db94535d CM |
492 | num_bytes -= btrfs_root_used(&dirty->root->root_item); |
493 | bytes_used = btrfs_root_used(&root->root_item); | |
494 | if (num_bytes) { | |
58176a96 | 495 | record_root_in_trans(root); |
5f39d397 | 496 | btrfs_set_root_used(&root->root_item, |
db94535d | 497 | bytes_used - num_bytes); |
58176a96 | 498 | } |
a2135011 CM |
499 | mutex_unlock(&root->fs_info->alloc_mutex); |
500 | ||
9f3a7427 | 501 | ret = btrfs_del_root(trans, tree_root, &dirty->root->root_key); |
58176a96 JB |
502 | if (ret) { |
503 | BUG(); | |
54aa1f4d | 504 | break; |
58176a96 | 505 | } |
a2135011 CM |
506 | mutex_unlock(&root->fs_info->drop_mutex); |
507 | ||
d3c2fdcf | 508 | nr = trans->blocks_used; |
0f7d52f4 CM |
509 | ret = btrfs_end_transaction(trans, tree_root); |
510 | BUG_ON(ret); | |
5eda7b5e | 511 | |
f510cfec | 512 | free_extent_buffer(dirty->root->node); |
9f3a7427 | 513 | kfree(dirty->root); |
0f7d52f4 | 514 | kfree(dirty); |
d3c2fdcf CM |
515 | |
516 | btrfs_btree_balance_dirty(tree_root, nr); | |
4dc11904 | 517 | cond_resched(); |
0f7d52f4 | 518 | } |
54aa1f4d | 519 | return ret; |
0f7d52f4 CM |
520 | } |
521 | ||
dc17ff8f CM |
522 | int btrfs_write_ordered_inodes(struct btrfs_trans_handle *trans, |
523 | struct btrfs_root *root) | |
524 | { | |
525 | struct btrfs_transaction *cur_trans = trans->transaction; | |
526 | struct inode *inode; | |
527 | u64 root_objectid = 0; | |
528 | u64 objectid = 0; | |
dc17ff8f CM |
529 | int ret; |
530 | ||
a2135011 | 531 | atomic_inc(&root->fs_info->throttles); |
dc17ff8f CM |
532 | while(1) { |
533 | ret = btrfs_find_first_ordered_inode( | |
534 | &cur_trans->ordered_inode_tree, | |
4d5e74bc | 535 | &root_objectid, &objectid, &inode); |
dc17ff8f CM |
536 | if (!ret) |
537 | break; | |
538 | ||
539 | mutex_unlock(&root->fs_info->trans_mutex); | |
4d5e74bc | 540 | |
81d7ed29 CM |
541 | if (S_ISREG(inode->i_mode)) { |
542 | atomic_inc(&BTRFS_I(inode)->ordered_writeback); | |
4d5e74bc | 543 | filemap_fdatawrite(inode->i_mapping); |
81d7ed29 CM |
544 | atomic_dec(&BTRFS_I(inode)->ordered_writeback); |
545 | } | |
4d5e74bc CM |
546 | iput(inode); |
547 | ||
dc17ff8f CM |
548 | mutex_lock(&root->fs_info->trans_mutex); |
549 | } | |
550 | while(1) { | |
551 | root_objectid = 0; | |
552 | objectid = 0; | |
553 | ret = btrfs_find_del_first_ordered_inode( | |
554 | &cur_trans->ordered_inode_tree, | |
4d5e74bc | 555 | &root_objectid, &objectid, &inode); |
dc17ff8f CM |
556 | if (!ret) |
557 | break; | |
558 | mutex_unlock(&root->fs_info->trans_mutex); | |
4d5e74bc | 559 | |
81d7ed29 CM |
560 | if (S_ISREG(inode->i_mode)) { |
561 | atomic_inc(&BTRFS_I(inode)->ordered_writeback); | |
4d5e74bc | 562 | filemap_write_and_wait(inode->i_mapping); |
81d7ed29 CM |
563 | atomic_dec(&BTRFS_I(inode)->ordered_writeback); |
564 | } | |
4d5e74bc CM |
565 | atomic_dec(&inode->i_count); |
566 | iput(inode); | |
567 | ||
dc17ff8f CM |
568 | mutex_lock(&root->fs_info->trans_mutex); |
569 | } | |
a2135011 | 570 | atomic_dec(&root->fs_info->throttles); |
3063d29f CM |
571 | return 0; |
572 | } | |
573 | ||
80b6794d | 574 | static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, |
3063d29f CM |
575 | struct btrfs_fs_info *fs_info, |
576 | struct btrfs_pending_snapshot *pending) | |
577 | { | |
578 | struct btrfs_key key; | |
80b6794d | 579 | struct btrfs_root_item *new_root_item; |
3063d29f CM |
580 | struct btrfs_root *tree_root = fs_info->tree_root; |
581 | struct btrfs_root *root = pending->root; | |
582 | struct extent_buffer *tmp; | |
925baedd | 583 | struct extent_buffer *old; |
3063d29f | 584 | int ret; |
3b96362c | 585 | int namelen; |
3063d29f CM |
586 | u64 objectid; |
587 | ||
80b6794d CM |
588 | new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS); |
589 | if (!new_root_item) { | |
590 | ret = -ENOMEM; | |
591 | goto fail; | |
592 | } | |
3063d29f CM |
593 | ret = btrfs_find_free_objectid(trans, tree_root, 0, &objectid); |
594 | if (ret) | |
595 | goto fail; | |
596 | ||
80b6794d | 597 | memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); |
3063d29f CM |
598 | |
599 | key.objectid = objectid; | |
600 | key.offset = 1; | |
601 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
602 | ||
925baedd CM |
603 | old = btrfs_lock_root_node(root); |
604 | btrfs_cow_block(trans, root, old, NULL, 0, &old); | |
3063d29f | 605 | |
925baedd CM |
606 | btrfs_copy_root(trans, root, old, &tmp, objectid); |
607 | btrfs_tree_unlock(old); | |
608 | free_extent_buffer(old); | |
3063d29f | 609 | |
80b6794d CM |
610 | btrfs_set_root_bytenr(new_root_item, tmp->start); |
611 | btrfs_set_root_level(new_root_item, btrfs_header_level(tmp)); | |
3063d29f | 612 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
80b6794d | 613 | new_root_item); |
925baedd | 614 | btrfs_tree_unlock(tmp); |
3063d29f CM |
615 | free_extent_buffer(tmp); |
616 | if (ret) | |
617 | goto fail; | |
618 | ||
619 | /* | |
620 | * insert the directory item | |
621 | */ | |
622 | key.offset = (u64)-1; | |
3b96362c | 623 | namelen = strlen(pending->name); |
3063d29f | 624 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, |
3b96362c | 625 | pending->name, namelen, |
3063d29f CM |
626 | root->fs_info->sb->s_root->d_inode->i_ino, |
627 | &key, BTRFS_FT_DIR); | |
628 | ||
629 | if (ret) | |
630 | goto fail; | |
631 | ||
632 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, | |
633 | pending->name, strlen(pending->name), objectid, | |
634 | root->fs_info->sb->s_root->d_inode->i_ino); | |
3b96362c SW |
635 | |
636 | /* Invalidate existing dcache entry for new snapshot. */ | |
637 | btrfs_invalidate_dcache_root(root, pending->name, namelen); | |
638 | ||
3063d29f | 639 | fail: |
80b6794d | 640 | kfree(new_root_item); |
3063d29f CM |
641 | return ret; |
642 | } | |
643 | ||
80b6794d CM |
644 | static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, |
645 | struct btrfs_fs_info *fs_info) | |
3063d29f CM |
646 | { |
647 | struct btrfs_pending_snapshot *pending; | |
648 | struct list_head *head = &trans->transaction->pending_snapshots; | |
649 | int ret; | |
650 | ||
651 | while(!list_empty(head)) { | |
652 | pending = list_entry(head->next, | |
653 | struct btrfs_pending_snapshot, list); | |
654 | ret = create_pending_snapshot(trans, fs_info, pending); | |
655 | BUG_ON(ret); | |
656 | list_del(&pending->list); | |
657 | kfree(pending->name); | |
658 | kfree(pending); | |
659 | } | |
dc17ff8f CM |
660 | return 0; |
661 | } | |
662 | ||
79154b1b CM |
663 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
664 | struct btrfs_root *root) | |
665 | { | |
15ee9bc7 JB |
666 | unsigned long joined = 0; |
667 | unsigned long timeout = 1; | |
79154b1b | 668 | struct btrfs_transaction *cur_trans; |
8fd17795 | 669 | struct btrfs_transaction *prev_trans = NULL; |
0b86a832 | 670 | struct btrfs_root *chunk_root = root->fs_info->chunk_root; |
0f7d52f4 | 671 | struct list_head dirty_fs_roots; |
d1310b2e | 672 | struct extent_io_tree *pinned_copy; |
79154b1b | 673 | DEFINE_WAIT(wait); |
15ee9bc7 | 674 | int ret; |
79154b1b | 675 | |
0f7d52f4 | 676 | INIT_LIST_HEAD(&dirty_fs_roots); |
d6e4a428 | 677 | |
79154b1b CM |
678 | mutex_lock(&root->fs_info->trans_mutex); |
679 | if (trans->transaction->in_commit) { | |
680 | cur_trans = trans->transaction; | |
681 | trans->transaction->use_count++; | |
ccd467d6 | 682 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b | 683 | btrfs_end_transaction(trans, root); |
ccd467d6 | 684 | |
79154b1b CM |
685 | ret = wait_for_commit(root, cur_trans); |
686 | BUG_ON(ret); | |
15ee9bc7 JB |
687 | |
688 | mutex_lock(&root->fs_info->trans_mutex); | |
79154b1b | 689 | put_transaction(cur_trans); |
15ee9bc7 JB |
690 | mutex_unlock(&root->fs_info->trans_mutex); |
691 | ||
79154b1b CM |
692 | return 0; |
693 | } | |
4313b399 CM |
694 | |
695 | pinned_copy = kmalloc(sizeof(*pinned_copy), GFP_NOFS); | |
696 | if (!pinned_copy) | |
697 | return -ENOMEM; | |
698 | ||
d1310b2e | 699 | extent_io_tree_init(pinned_copy, |
4313b399 CM |
700 | root->fs_info->btree_inode->i_mapping, GFP_NOFS); |
701 | ||
2c90e5d6 | 702 | trans->transaction->in_commit = 1; |
89ce8a63 | 703 | printk("trans %Lu in commit\n", trans->transid); |
ccd467d6 CM |
704 | cur_trans = trans->transaction; |
705 | if (cur_trans->list.prev != &root->fs_info->trans_list) { | |
706 | prev_trans = list_entry(cur_trans->list.prev, | |
707 | struct btrfs_transaction, list); | |
708 | if (!prev_trans->commit_done) { | |
709 | prev_trans->use_count++; | |
ccd467d6 CM |
710 | mutex_unlock(&root->fs_info->trans_mutex); |
711 | ||
712 | wait_for_commit(root, prev_trans); | |
ccd467d6 | 713 | |
ccd467d6 | 714 | mutex_lock(&root->fs_info->trans_mutex); |
15ee9bc7 | 715 | put_transaction(prev_trans); |
ccd467d6 CM |
716 | } |
717 | } | |
15ee9bc7 JB |
718 | |
719 | do { | |
720 | joined = cur_trans->num_joined; | |
2c90e5d6 | 721 | WARN_ON(cur_trans != trans->transaction); |
15ee9bc7 | 722 | prepare_to_wait(&cur_trans->writer_wait, &wait, |
79154b1b | 723 | TASK_UNINTERRUPTIBLE); |
15ee9bc7 JB |
724 | |
725 | if (cur_trans->num_writers > 1) | |
726 | timeout = MAX_SCHEDULE_TIMEOUT; | |
727 | else | |
728 | timeout = 1; | |
729 | ||
79154b1b | 730 | mutex_unlock(&root->fs_info->trans_mutex); |
15ee9bc7 JB |
731 | |
732 | schedule_timeout(timeout); | |
733 | ||
79154b1b | 734 | mutex_lock(&root->fs_info->trans_mutex); |
15ee9bc7 | 735 | finish_wait(&cur_trans->writer_wait, &wait); |
dc17ff8f CM |
736 | ret = btrfs_write_ordered_inodes(trans, root); |
737 | ||
15ee9bc7 JB |
738 | } while (cur_trans->num_writers > 1 || |
739 | (cur_trans->num_joined != joined)); | |
740 | ||
3063d29f CM |
741 | ret = create_pending_snapshots(trans, root->fs_info); |
742 | BUG_ON(ret); | |
743 | ||
2c90e5d6 | 744 | WARN_ON(cur_trans != trans->transaction); |
dc17ff8f | 745 | |
54aa1f4d CM |
746 | ret = add_dirty_roots(trans, &root->fs_info->fs_roots_radix, |
747 | &dirty_fs_roots); | |
748 | BUG_ON(ret); | |
749 | ||
79154b1b CM |
750 | ret = btrfs_commit_tree_roots(trans, root); |
751 | BUG_ON(ret); | |
54aa1f4d | 752 | |
78fae27e | 753 | cur_trans = root->fs_info->running_transaction; |
cee36a03 | 754 | spin_lock(&root->fs_info->new_trans_lock); |
78fae27e | 755 | root->fs_info->running_transaction = NULL; |
cee36a03 | 756 | spin_unlock(&root->fs_info->new_trans_lock); |
4b52dff6 CM |
757 | btrfs_set_super_generation(&root->fs_info->super_copy, |
758 | cur_trans->transid); | |
759 | btrfs_set_super_root(&root->fs_info->super_copy, | |
db94535d CM |
760 | root->fs_info->tree_root->node->start); |
761 | btrfs_set_super_root_level(&root->fs_info->super_copy, | |
762 | btrfs_header_level(root->fs_info->tree_root->node)); | |
5f39d397 | 763 | |
0b86a832 CM |
764 | btrfs_set_super_chunk_root(&root->fs_info->super_copy, |
765 | chunk_root->node->start); | |
766 | btrfs_set_super_chunk_root_level(&root->fs_info->super_copy, | |
767 | btrfs_header_level(chunk_root->node)); | |
a061fc8d CM |
768 | memcpy(&root->fs_info->super_for_commit, &root->fs_info->super_copy, |
769 | sizeof(root->fs_info->super_copy)); | |
ccd467d6 | 770 | |
4313b399 | 771 | btrfs_copy_pinned(root, pinned_copy); |
ccd467d6 | 772 | |
78fae27e | 773 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b CM |
774 | ret = btrfs_write_and_wait_transaction(trans, root); |
775 | BUG_ON(ret); | |
79154b1b | 776 | write_ctree_super(trans, root); |
4313b399 | 777 | |
4313b399 | 778 | btrfs_finish_extent_commit(trans, root, pinned_copy); |
78fae27e | 779 | mutex_lock(&root->fs_info->trans_mutex); |
4313b399 CM |
780 | |
781 | kfree(pinned_copy); | |
782 | ||
2c90e5d6 | 783 | cur_trans->commit_done = 1; |
89ce8a63 | 784 | printk("trans %Lu done in commit\n", cur_trans->transid); |
15ee9bc7 | 785 | root->fs_info->last_trans_committed = cur_trans->transid; |
2c90e5d6 | 786 | wake_up(&cur_trans->commit_wait); |
78fae27e | 787 | put_transaction(cur_trans); |
79154b1b | 788 | put_transaction(cur_trans); |
58176a96 | 789 | |
facda1e7 CM |
790 | if (root->fs_info->closing) |
791 | list_splice_init(&root->fs_info->dead_roots, &dirty_fs_roots); | |
792 | else | |
793 | list_splice_init(&dirty_fs_roots, &root->fs_info->dead_roots); | |
58176a96 | 794 | |
78fae27e | 795 | mutex_unlock(&root->fs_info->trans_mutex); |
2c90e5d6 | 796 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b | 797 | |
facda1e7 | 798 | if (root->fs_info->closing) { |
facda1e7 | 799 | drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots); |
facda1e7 | 800 | } |
79154b1b CM |
801 | return ret; |
802 | } | |
803 | ||
e9d0b13b CM |
804 | int btrfs_clean_old_snapshots(struct btrfs_root *root) |
805 | { | |
806 | struct list_head dirty_roots; | |
807 | INIT_LIST_HEAD(&dirty_roots); | |
a74a4b97 | 808 | again: |
e9d0b13b CM |
809 | mutex_lock(&root->fs_info->trans_mutex); |
810 | list_splice_init(&root->fs_info->dead_roots, &dirty_roots); | |
811 | mutex_unlock(&root->fs_info->trans_mutex); | |
812 | ||
813 | if (!list_empty(&dirty_roots)) { | |
814 | drop_dirty_roots(root, &dirty_roots); | |
a74a4b97 | 815 | goto again; |
e9d0b13b CM |
816 | } |
817 | return 0; | |
818 | } | |
08607c1b | 819 |