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 | ||
08607c1b CM |
32 | static struct workqueue_struct *trans_wq; |
33 | ||
0f7d52f4 | 34 | #define BTRFS_ROOT_TRANS_TAG 0 |
6702ed49 | 35 | #define BTRFS_ROOT_DEFRAG_TAG 1 |
0f7d52f4 | 36 | |
80b6794d | 37 | static noinline void put_transaction(struct btrfs_transaction *transaction) |
79154b1b | 38 | { |
2c90e5d6 | 39 | WARN_ON(transaction->use_count == 0); |
79154b1b | 40 | transaction->use_count--; |
78fae27e CM |
41 | if (transaction->use_count == 0) { |
42 | WARN_ON(total_trans == 0); | |
43 | total_trans--; | |
8fd17795 | 44 | list_del_init(&transaction->list); |
2c90e5d6 CM |
45 | memset(transaction, 0, sizeof(*transaction)); |
46 | kmem_cache_free(btrfs_transaction_cachep, transaction); | |
78fae27e | 47 | } |
79154b1b CM |
48 | } |
49 | ||
80b6794d | 50 | static noinline int join_transaction(struct btrfs_root *root) |
79154b1b CM |
51 | { |
52 | struct btrfs_transaction *cur_trans; | |
53 | cur_trans = root->fs_info->running_transaction; | |
54 | if (!cur_trans) { | |
2c90e5d6 CM |
55 | cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, |
56 | GFP_NOFS); | |
78fae27e | 57 | total_trans++; |
79154b1b | 58 | BUG_ON(!cur_trans); |
0f7d52f4 | 59 | root->fs_info->generation++; |
e18e4809 | 60 | root->fs_info->last_alloc = 0; |
4529ba49 | 61 | root->fs_info->last_data_alloc = 0; |
15ee9bc7 JB |
62 | cur_trans->num_writers = 1; |
63 | cur_trans->num_joined = 0; | |
0f7d52f4 | 64 | cur_trans->transid = root->fs_info->generation; |
79154b1b CM |
65 | init_waitqueue_head(&cur_trans->writer_wait); |
66 | init_waitqueue_head(&cur_trans->commit_wait); | |
67 | cur_trans->in_commit = 0; | |
d5719762 | 68 | cur_trans->use_count = 1; |
79154b1b | 69 | cur_trans->commit_done = 0; |
08607c1b | 70 | cur_trans->start_time = get_seconds(); |
3063d29f | 71 | INIT_LIST_HEAD(&cur_trans->pending_snapshots); |
8fd17795 | 72 | list_add_tail(&cur_trans->list, &root->fs_info->trans_list); |
dc17ff8f | 73 | btrfs_ordered_inode_tree_init(&cur_trans->ordered_inode_tree); |
d1310b2e | 74 | extent_io_tree_init(&cur_trans->dirty_pages, |
5f39d397 CM |
75 | root->fs_info->btree_inode->i_mapping, |
76 | GFP_NOFS); | |
48ec2cf8 CM |
77 | spin_lock(&root->fs_info->new_trans_lock); |
78 | root->fs_info->running_transaction = cur_trans; | |
79 | spin_unlock(&root->fs_info->new_trans_lock); | |
15ee9bc7 JB |
80 | } else { |
81 | cur_trans->num_writers++; | |
82 | cur_trans->num_joined++; | |
79154b1b | 83 | } |
15ee9bc7 | 84 | |
79154b1b CM |
85 | return 0; |
86 | } | |
87 | ||
80b6794d | 88 | static noinline int record_root_in_trans(struct btrfs_root *root) |
6702ed49 CM |
89 | { |
90 | u64 running_trans_id = root->fs_info->running_transaction->transid; | |
91 | if (root->ref_cows && root->last_trans < running_trans_id) { | |
92 | WARN_ON(root == root->fs_info->extent_root); | |
93 | if (root->root_item.refs != 0) { | |
94 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, | |
95 | (unsigned long)root->root_key.objectid, | |
96 | BTRFS_ROOT_TRANS_TAG); | |
97 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, | |
98 | (unsigned long)root->root_key.objectid, | |
99 | BTRFS_ROOT_DEFRAG_TAG); | |
925baedd | 100 | root->commit_root = btrfs_root_node(root); |
6702ed49 CM |
101 | } else { |
102 | WARN_ON(1); | |
103 | } | |
104 | root->last_trans = running_trans_id; | |
105 | } | |
106 | return 0; | |
107 | } | |
108 | ||
79154b1b CM |
109 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
110 | int num_blocks) | |
111 | { | |
2c90e5d6 CM |
112 | struct btrfs_trans_handle *h = |
113 | kmem_cache_alloc(btrfs_trans_handle_cachep, GFP_NOFS); | |
79154b1b CM |
114 | int ret; |
115 | ||
116 | mutex_lock(&root->fs_info->trans_mutex); | |
117 | ret = join_transaction(root); | |
118 | BUG_ON(ret); | |
0f7d52f4 | 119 | |
6702ed49 CM |
120 | record_root_in_trans(root); |
121 | h->transid = root->fs_info->running_transaction->transid; | |
79154b1b CM |
122 | h->transaction = root->fs_info->running_transaction; |
123 | h->blocks_reserved = num_blocks; | |
124 | h->blocks_used = 0; | |
31f3c99b | 125 | h->block_group = NULL; |
26b8003f CM |
126 | h->alloc_exclude_nr = 0; |
127 | h->alloc_exclude_start = 0; | |
79154b1b CM |
128 | root->fs_info->running_transaction->use_count++; |
129 | mutex_unlock(&root->fs_info->trans_mutex); | |
130 | return h; | |
131 | } | |
132 | ||
133 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, | |
134 | struct btrfs_root *root) | |
135 | { | |
136 | struct btrfs_transaction *cur_trans; | |
d6e4a428 | 137 | |
79154b1b CM |
138 | mutex_lock(&root->fs_info->trans_mutex); |
139 | cur_trans = root->fs_info->running_transaction; | |
ccd467d6 | 140 | WARN_ON(cur_trans != trans->transaction); |
d5719762 | 141 | WARN_ON(cur_trans->num_writers < 1); |
ccd467d6 | 142 | cur_trans->num_writers--; |
79154b1b CM |
143 | if (waitqueue_active(&cur_trans->writer_wait)) |
144 | wake_up(&cur_trans->writer_wait); | |
79154b1b CM |
145 | put_transaction(cur_trans); |
146 | mutex_unlock(&root->fs_info->trans_mutex); | |
d6025579 | 147 | memset(trans, 0, sizeof(*trans)); |
2c90e5d6 | 148 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b CM |
149 | return 0; |
150 | } | |
151 | ||
152 | ||
153 | int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, | |
154 | struct btrfs_root *root) | |
155 | { | |
7c4452b9 | 156 | int ret; |
7c4452b9 CM |
157 | int err; |
158 | int werr = 0; | |
d1310b2e | 159 | struct extent_io_tree *dirty_pages; |
7c4452b9 | 160 | struct page *page; |
7c4452b9 | 161 | struct inode *btree_inode = root->fs_info->btree_inode; |
5f39d397 CM |
162 | u64 start; |
163 | u64 end; | |
164 | unsigned long index; | |
7c4452b9 CM |
165 | |
166 | if (!trans || !trans->transaction) { | |
167 | return filemap_write_and_wait(btree_inode->i_mapping); | |
168 | } | |
169 | dirty_pages = &trans->transaction->dirty_pages; | |
170 | while(1) { | |
5f39d397 CM |
171 | ret = find_first_extent_bit(dirty_pages, 0, &start, &end, |
172 | EXTENT_DIRTY); | |
173 | if (ret) | |
7c4452b9 | 174 | break; |
5f39d397 CM |
175 | clear_extent_dirty(dirty_pages, start, end, GFP_NOFS); |
176 | while(start <= end) { | |
177 | index = start >> PAGE_CACHE_SHIFT; | |
35ebb934 | 178 | start = (u64)(index + 1) << PAGE_CACHE_SHIFT; |
5f39d397 | 179 | page = find_lock_page(btree_inode->i_mapping, index); |
7c4452b9 CM |
180 | if (!page) |
181 | continue; | |
6702ed49 CM |
182 | if (PageWriteback(page)) { |
183 | if (PageDirty(page)) | |
184 | wait_on_page_writeback(page); | |
185 | else { | |
186 | unlock_page(page); | |
187 | page_cache_release(page); | |
188 | continue; | |
189 | } | |
190 | } | |
7c4452b9 CM |
191 | err = write_one_page(page, 0); |
192 | if (err) | |
193 | werr = err; | |
194 | page_cache_release(page); | |
195 | } | |
196 | } | |
197 | err = filemap_fdatawait(btree_inode->i_mapping); | |
198 | if (err) | |
199 | werr = err; | |
200 | return werr; | |
79154b1b CM |
201 | } |
202 | ||
0b86a832 CM |
203 | static int update_cowonly_root(struct btrfs_trans_handle *trans, |
204 | struct btrfs_root *root) | |
79154b1b CM |
205 | { |
206 | int ret; | |
0b86a832 CM |
207 | u64 old_root_bytenr; |
208 | struct btrfs_root *tree_root = root->fs_info->tree_root; | |
79154b1b | 209 | |
0b86a832 | 210 | btrfs_write_dirty_block_groups(trans, root); |
79154b1b | 211 | while(1) { |
0b86a832 CM |
212 | old_root_bytenr = btrfs_root_bytenr(&root->root_item); |
213 | if (old_root_bytenr == root->node->start) | |
79154b1b | 214 | break; |
0b86a832 CM |
215 | btrfs_set_root_bytenr(&root->root_item, |
216 | root->node->start); | |
217 | btrfs_set_root_level(&root->root_item, | |
218 | btrfs_header_level(root->node)); | |
79154b1b | 219 | ret = btrfs_update_root(trans, tree_root, |
0b86a832 CM |
220 | &root->root_key, |
221 | &root->root_item); | |
79154b1b | 222 | BUG_ON(ret); |
0b86a832 CM |
223 | btrfs_write_dirty_block_groups(trans, root); |
224 | } | |
225 | return 0; | |
226 | } | |
227 | ||
228 | int btrfs_commit_tree_roots(struct btrfs_trans_handle *trans, | |
229 | struct btrfs_root *root) | |
230 | { | |
231 | struct btrfs_fs_info *fs_info = root->fs_info; | |
232 | struct list_head *next; | |
233 | ||
234 | while(!list_empty(&fs_info->dirty_cowonly_roots)) { | |
235 | next = fs_info->dirty_cowonly_roots.next; | |
236 | list_del_init(next); | |
237 | root = list_entry(next, struct btrfs_root, dirty_list); | |
238 | update_cowonly_root(trans, root); | |
79154b1b CM |
239 | } |
240 | return 0; | |
241 | } | |
242 | ||
80b6794d CM |
243 | static noinline int wait_for_commit(struct btrfs_root *root, |
244 | struct btrfs_transaction *commit) | |
79154b1b CM |
245 | { |
246 | DEFINE_WAIT(wait); | |
ccd467d6 | 247 | mutex_lock(&root->fs_info->trans_mutex); |
79154b1b CM |
248 | while(!commit->commit_done) { |
249 | prepare_to_wait(&commit->commit_wait, &wait, | |
250 | TASK_UNINTERRUPTIBLE); | |
251 | if (commit->commit_done) | |
252 | break; | |
253 | mutex_unlock(&root->fs_info->trans_mutex); | |
254 | schedule(); | |
255 | mutex_lock(&root->fs_info->trans_mutex); | |
256 | } | |
ccd467d6 | 257 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b CM |
258 | finish_wait(&commit->commit_wait, &wait); |
259 | return 0; | |
260 | } | |
261 | ||
0f7d52f4 CM |
262 | struct dirty_root { |
263 | struct list_head list; | |
0f7d52f4 | 264 | struct btrfs_root *root; |
58176a96 | 265 | struct btrfs_root *latest_root; |
0f7d52f4 CM |
266 | }; |
267 | ||
5ce14bbc CM |
268 | int btrfs_add_dead_root(struct btrfs_root *root, |
269 | struct btrfs_root *latest, | |
270 | struct list_head *dead_list) | |
5eda7b5e CM |
271 | { |
272 | struct dirty_root *dirty; | |
273 | ||
274 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
275 | if (!dirty) | |
276 | return -ENOMEM; | |
5eda7b5e | 277 | dirty->root = root; |
5ce14bbc | 278 | dirty->latest_root = latest; |
5eda7b5e CM |
279 | list_add(&dirty->list, dead_list); |
280 | return 0; | |
281 | } | |
282 | ||
80b6794d CM |
283 | static noinline int add_dirty_roots(struct btrfs_trans_handle *trans, |
284 | struct radix_tree_root *radix, | |
285 | struct list_head *list) | |
0f7d52f4 CM |
286 | { |
287 | struct dirty_root *dirty; | |
288 | struct btrfs_root *gang[8]; | |
289 | struct btrfs_root *root; | |
290 | int i; | |
291 | int ret; | |
54aa1f4d | 292 | int err = 0; |
5eda7b5e | 293 | u32 refs; |
54aa1f4d | 294 | |
0f7d52f4 CM |
295 | while(1) { |
296 | ret = radix_tree_gang_lookup_tag(radix, (void **)gang, 0, | |
297 | ARRAY_SIZE(gang), | |
298 | BTRFS_ROOT_TRANS_TAG); | |
299 | if (ret == 0) | |
300 | break; | |
301 | for (i = 0; i < ret; i++) { | |
302 | root = gang[i]; | |
2619ba1f CM |
303 | radix_tree_tag_clear(radix, |
304 | (unsigned long)root->root_key.objectid, | |
305 | BTRFS_ROOT_TRANS_TAG); | |
0f7d52f4 | 306 | if (root->commit_root == root->node) { |
db94535d CM |
307 | WARN_ON(root->node->start != |
308 | btrfs_root_bytenr(&root->root_item)); | |
5f39d397 | 309 | free_extent_buffer(root->commit_root); |
0f7d52f4 | 310 | root->commit_root = NULL; |
58176a96 JB |
311 | |
312 | /* make sure to update the root on disk | |
313 | * so we get any updates to the block used | |
314 | * counts | |
315 | */ | |
316 | err = btrfs_update_root(trans, | |
317 | root->fs_info->tree_root, | |
318 | &root->root_key, | |
319 | &root->root_item); | |
0f7d52f4 CM |
320 | continue; |
321 | } | |
322 | dirty = kmalloc(sizeof(*dirty), GFP_NOFS); | |
323 | BUG_ON(!dirty); | |
9f3a7427 CM |
324 | dirty->root = kmalloc(sizeof(*dirty->root), GFP_NOFS); |
325 | BUG_ON(!dirty->root); | |
326 | ||
327 | memset(&root->root_item.drop_progress, 0, | |
328 | sizeof(struct btrfs_disk_key)); | |
329 | root->root_item.drop_level = 0; | |
330 | ||
331 | memcpy(dirty->root, root, sizeof(*root)); | |
332 | dirty->root->node = root->commit_root; | |
58176a96 | 333 | dirty->latest_root = root; |
0f7d52f4 | 334 | root->commit_root = NULL; |
5eda7b5e | 335 | |
0f7d52f4 | 336 | root->root_key.offset = root->fs_info->generation; |
db94535d CM |
337 | btrfs_set_root_bytenr(&root->root_item, |
338 | root->node->start); | |
339 | btrfs_set_root_level(&root->root_item, | |
340 | btrfs_header_level(root->node)); | |
0f7d52f4 CM |
341 | err = btrfs_insert_root(trans, root->fs_info->tree_root, |
342 | &root->root_key, | |
343 | &root->root_item); | |
54aa1f4d CM |
344 | if (err) |
345 | break; | |
9f3a7427 CM |
346 | |
347 | refs = btrfs_root_refs(&dirty->root->root_item); | |
348 | btrfs_set_root_refs(&dirty->root->root_item, refs - 1); | |
5eda7b5e | 349 | err = btrfs_update_root(trans, root->fs_info->tree_root, |
9f3a7427 CM |
350 | &dirty->root->root_key, |
351 | &dirty->root->root_item); | |
5eda7b5e CM |
352 | |
353 | BUG_ON(err); | |
9f3a7427 | 354 | if (refs == 1) { |
5eda7b5e | 355 | list_add(&dirty->list, list); |
9f3a7427 CM |
356 | } else { |
357 | WARN_ON(1); | |
358 | kfree(dirty->root); | |
5eda7b5e | 359 | kfree(dirty); |
9f3a7427 | 360 | } |
0f7d52f4 CM |
361 | } |
362 | } | |
54aa1f4d | 363 | return err; |
0f7d52f4 CM |
364 | } |
365 | ||
e9d0b13b CM |
366 | int btrfs_defrag_root(struct btrfs_root *root, int cacheonly) |
367 | { | |
368 | struct btrfs_fs_info *info = root->fs_info; | |
369 | int ret; | |
370 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 371 | unsigned long nr; |
e9d0b13b | 372 | |
a2135011 | 373 | smp_mb(); |
e9d0b13b CM |
374 | if (root->defrag_running) |
375 | return 0; | |
e9d0b13b | 376 | trans = btrfs_start_transaction(root, 1); |
6b80053d | 377 | while (1) { |
e9d0b13b CM |
378 | root->defrag_running = 1; |
379 | ret = btrfs_defrag_leaves(trans, root, cacheonly); | |
d3c2fdcf | 380 | nr = trans->blocks_used; |
e9d0b13b | 381 | btrfs_end_transaction(trans, root); |
d3c2fdcf | 382 | btrfs_btree_balance_dirty(info->tree_root, nr); |
e9d0b13b CM |
383 | cond_resched(); |
384 | ||
e9d0b13b CM |
385 | trans = btrfs_start_transaction(root, 1); |
386 | if (ret != -EAGAIN) | |
387 | break; | |
388 | } | |
389 | root->defrag_running = 0; | |
a2135011 | 390 | smp_mb(); |
e9d0b13b CM |
391 | radix_tree_tag_clear(&info->fs_roots_radix, |
392 | (unsigned long)root->root_key.objectid, | |
393 | BTRFS_ROOT_DEFRAG_TAG); | |
394 | btrfs_end_transaction(trans, root); | |
395 | return 0; | |
396 | } | |
397 | ||
6702ed49 CM |
398 | int btrfs_defrag_dirty_roots(struct btrfs_fs_info *info) |
399 | { | |
400 | struct btrfs_root *gang[1]; | |
401 | struct btrfs_root *root; | |
6702ed49 CM |
402 | int i; |
403 | int ret; | |
404 | int err = 0; | |
405 | u64 last = 0; | |
406 | ||
6702ed49 CM |
407 | while(1) { |
408 | ret = radix_tree_gang_lookup_tag(&info->fs_roots_radix, | |
409 | (void **)gang, last, | |
410 | ARRAY_SIZE(gang), | |
411 | BTRFS_ROOT_DEFRAG_TAG); | |
412 | if (ret == 0) | |
413 | break; | |
414 | for (i = 0; i < ret; i++) { | |
415 | root = gang[i]; | |
416 | last = root->root_key.objectid + 1; | |
f510cfec | 417 | btrfs_defrag_root(root, 1); |
6702ed49 CM |
418 | } |
419 | } | |
6b80053d | 420 | btrfs_defrag_root(info->extent_root, 1); |
6702ed49 CM |
421 | return err; |
422 | } | |
423 | ||
80b6794d CM |
424 | static noinline int drop_dirty_roots(struct btrfs_root *tree_root, |
425 | struct list_head *list) | |
0f7d52f4 CM |
426 | { |
427 | struct dirty_root *dirty; | |
428 | struct btrfs_trans_handle *trans; | |
d3c2fdcf | 429 | unsigned long nr; |
db94535d CM |
430 | u64 num_bytes; |
431 | u64 bytes_used; | |
54aa1f4d | 432 | int ret = 0; |
9f3a7427 CM |
433 | int err; |
434 | ||
0f7d52f4 | 435 | while(!list_empty(list)) { |
58176a96 JB |
436 | struct btrfs_root *root; |
437 | ||
0f7d52f4 CM |
438 | dirty = list_entry(list->next, struct dirty_root, list); |
439 | list_del_init(&dirty->list); | |
5eda7b5e | 440 | |
db94535d | 441 | num_bytes = btrfs_root_used(&dirty->root->root_item); |
58176a96 | 442 | root = dirty->latest_root; |
a2135011 | 443 | atomic_inc(&root->fs_info->throttles); |
58176a96 | 444 | |
a2135011 | 445 | mutex_lock(&root->fs_info->drop_mutex); |
9f3a7427 CM |
446 | while(1) { |
447 | trans = btrfs_start_transaction(tree_root, 1); | |
448 | ret = btrfs_drop_snapshot(trans, dirty->root); | |
449 | if (ret != -EAGAIN) { | |
450 | break; | |
451 | } | |
58176a96 | 452 | |
9f3a7427 CM |
453 | err = btrfs_update_root(trans, |
454 | tree_root, | |
455 | &dirty->root->root_key, | |
456 | &dirty->root->root_item); | |
457 | if (err) | |
458 | ret = err; | |
d3c2fdcf | 459 | nr = trans->blocks_used; |
9f3a7427 CM |
460 | ret = btrfs_end_transaction(trans, tree_root); |
461 | BUG_ON(ret); | |
a2135011 CM |
462 | |
463 | mutex_unlock(&root->fs_info->drop_mutex); | |
d3c2fdcf | 464 | btrfs_btree_balance_dirty(tree_root, nr); |
4dc11904 | 465 | cond_resched(); |
a2135011 | 466 | mutex_lock(&root->fs_info->drop_mutex); |
9f3a7427 | 467 | } |
0f7d52f4 | 468 | BUG_ON(ret); |
a2135011 | 469 | atomic_dec(&root->fs_info->throttles); |
58176a96 | 470 | |
a2135011 | 471 | mutex_lock(&root->fs_info->alloc_mutex); |
db94535d CM |
472 | num_bytes -= btrfs_root_used(&dirty->root->root_item); |
473 | bytes_used = btrfs_root_used(&root->root_item); | |
474 | if (num_bytes) { | |
58176a96 | 475 | record_root_in_trans(root); |
5f39d397 | 476 | btrfs_set_root_used(&root->root_item, |
db94535d | 477 | bytes_used - num_bytes); |
58176a96 | 478 | } |
a2135011 CM |
479 | mutex_unlock(&root->fs_info->alloc_mutex); |
480 | ||
9f3a7427 | 481 | ret = btrfs_del_root(trans, tree_root, &dirty->root->root_key); |
58176a96 JB |
482 | if (ret) { |
483 | BUG(); | |
54aa1f4d | 484 | break; |
58176a96 | 485 | } |
a2135011 CM |
486 | mutex_unlock(&root->fs_info->drop_mutex); |
487 | ||
d3c2fdcf | 488 | nr = trans->blocks_used; |
0f7d52f4 CM |
489 | ret = btrfs_end_transaction(trans, tree_root); |
490 | BUG_ON(ret); | |
5eda7b5e | 491 | |
f510cfec | 492 | free_extent_buffer(dirty->root->node); |
9f3a7427 | 493 | kfree(dirty->root); |
0f7d52f4 | 494 | kfree(dirty); |
d3c2fdcf CM |
495 | |
496 | btrfs_btree_balance_dirty(tree_root, nr); | |
4dc11904 | 497 | cond_resched(); |
0f7d52f4 | 498 | } |
54aa1f4d | 499 | return ret; |
0f7d52f4 CM |
500 | } |
501 | ||
dc17ff8f CM |
502 | int btrfs_write_ordered_inodes(struct btrfs_trans_handle *trans, |
503 | struct btrfs_root *root) | |
504 | { | |
505 | struct btrfs_transaction *cur_trans = trans->transaction; | |
506 | struct inode *inode; | |
507 | u64 root_objectid = 0; | |
508 | u64 objectid = 0; | |
dc17ff8f CM |
509 | int ret; |
510 | ||
a2135011 | 511 | atomic_inc(&root->fs_info->throttles); |
dc17ff8f CM |
512 | while(1) { |
513 | ret = btrfs_find_first_ordered_inode( | |
514 | &cur_trans->ordered_inode_tree, | |
4d5e74bc | 515 | &root_objectid, &objectid, &inode); |
dc17ff8f CM |
516 | if (!ret) |
517 | break; | |
518 | ||
519 | mutex_unlock(&root->fs_info->trans_mutex); | |
4d5e74bc | 520 | |
81d7ed29 CM |
521 | if (S_ISREG(inode->i_mode)) { |
522 | atomic_inc(&BTRFS_I(inode)->ordered_writeback); | |
4d5e74bc | 523 | filemap_fdatawrite(inode->i_mapping); |
81d7ed29 CM |
524 | atomic_dec(&BTRFS_I(inode)->ordered_writeback); |
525 | } | |
4d5e74bc CM |
526 | iput(inode); |
527 | ||
dc17ff8f CM |
528 | mutex_lock(&root->fs_info->trans_mutex); |
529 | } | |
530 | while(1) { | |
531 | root_objectid = 0; | |
532 | objectid = 0; | |
533 | ret = btrfs_find_del_first_ordered_inode( | |
534 | &cur_trans->ordered_inode_tree, | |
4d5e74bc | 535 | &root_objectid, &objectid, &inode); |
dc17ff8f CM |
536 | if (!ret) |
537 | break; | |
538 | mutex_unlock(&root->fs_info->trans_mutex); | |
4d5e74bc | 539 | |
81d7ed29 CM |
540 | if (S_ISREG(inode->i_mode)) { |
541 | atomic_inc(&BTRFS_I(inode)->ordered_writeback); | |
4d5e74bc | 542 | filemap_write_and_wait(inode->i_mapping); |
81d7ed29 CM |
543 | atomic_dec(&BTRFS_I(inode)->ordered_writeback); |
544 | } | |
4d5e74bc CM |
545 | atomic_dec(&inode->i_count); |
546 | iput(inode); | |
547 | ||
dc17ff8f CM |
548 | mutex_lock(&root->fs_info->trans_mutex); |
549 | } | |
a2135011 | 550 | atomic_dec(&root->fs_info->throttles); |
3063d29f CM |
551 | return 0; |
552 | } | |
553 | ||
80b6794d | 554 | static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, |
3063d29f CM |
555 | struct btrfs_fs_info *fs_info, |
556 | struct btrfs_pending_snapshot *pending) | |
557 | { | |
558 | struct btrfs_key key; | |
80b6794d | 559 | struct btrfs_root_item *new_root_item; |
3063d29f CM |
560 | struct btrfs_root *tree_root = fs_info->tree_root; |
561 | struct btrfs_root *root = pending->root; | |
562 | struct extent_buffer *tmp; | |
925baedd | 563 | struct extent_buffer *old; |
3063d29f | 564 | int ret; |
3b96362c | 565 | int namelen; |
3063d29f CM |
566 | u64 objectid; |
567 | ||
80b6794d CM |
568 | new_root_item = kmalloc(sizeof(*new_root_item), GFP_NOFS); |
569 | if (!new_root_item) { | |
570 | ret = -ENOMEM; | |
571 | goto fail; | |
572 | } | |
3063d29f CM |
573 | ret = btrfs_find_free_objectid(trans, tree_root, 0, &objectid); |
574 | if (ret) | |
575 | goto fail; | |
576 | ||
80b6794d | 577 | memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); |
3063d29f CM |
578 | |
579 | key.objectid = objectid; | |
580 | key.offset = 1; | |
581 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
582 | ||
925baedd CM |
583 | old = btrfs_lock_root_node(root); |
584 | btrfs_cow_block(trans, root, old, NULL, 0, &old); | |
3063d29f | 585 | |
925baedd CM |
586 | btrfs_copy_root(trans, root, old, &tmp, objectid); |
587 | btrfs_tree_unlock(old); | |
588 | free_extent_buffer(old); | |
3063d29f | 589 | |
80b6794d CM |
590 | btrfs_set_root_bytenr(new_root_item, tmp->start); |
591 | btrfs_set_root_level(new_root_item, btrfs_header_level(tmp)); | |
3063d29f | 592 | ret = btrfs_insert_root(trans, root->fs_info->tree_root, &key, |
80b6794d | 593 | new_root_item); |
925baedd | 594 | btrfs_tree_unlock(tmp); |
3063d29f CM |
595 | free_extent_buffer(tmp); |
596 | if (ret) | |
597 | goto fail; | |
598 | ||
599 | /* | |
600 | * insert the directory item | |
601 | */ | |
602 | key.offset = (u64)-1; | |
3b96362c | 603 | namelen = strlen(pending->name); |
3063d29f | 604 | ret = btrfs_insert_dir_item(trans, root->fs_info->tree_root, |
3b96362c | 605 | pending->name, namelen, |
3063d29f CM |
606 | root->fs_info->sb->s_root->d_inode->i_ino, |
607 | &key, BTRFS_FT_DIR); | |
608 | ||
609 | if (ret) | |
610 | goto fail; | |
611 | ||
612 | ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root, | |
613 | pending->name, strlen(pending->name), objectid, | |
614 | root->fs_info->sb->s_root->d_inode->i_ino); | |
3b96362c SW |
615 | |
616 | /* Invalidate existing dcache entry for new snapshot. */ | |
617 | btrfs_invalidate_dcache_root(root, pending->name, namelen); | |
618 | ||
3063d29f | 619 | fail: |
80b6794d | 620 | kfree(new_root_item); |
3063d29f CM |
621 | return ret; |
622 | } | |
623 | ||
80b6794d CM |
624 | static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, |
625 | struct btrfs_fs_info *fs_info) | |
3063d29f CM |
626 | { |
627 | struct btrfs_pending_snapshot *pending; | |
628 | struct list_head *head = &trans->transaction->pending_snapshots; | |
629 | int ret; | |
630 | ||
631 | while(!list_empty(head)) { | |
632 | pending = list_entry(head->next, | |
633 | struct btrfs_pending_snapshot, list); | |
634 | ret = create_pending_snapshot(trans, fs_info, pending); | |
635 | BUG_ON(ret); | |
636 | list_del(&pending->list); | |
637 | kfree(pending->name); | |
638 | kfree(pending); | |
639 | } | |
dc17ff8f CM |
640 | return 0; |
641 | } | |
642 | ||
79154b1b CM |
643 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
644 | struct btrfs_root *root) | |
645 | { | |
15ee9bc7 JB |
646 | unsigned long joined = 0; |
647 | unsigned long timeout = 1; | |
79154b1b | 648 | struct btrfs_transaction *cur_trans; |
8fd17795 | 649 | struct btrfs_transaction *prev_trans = NULL; |
0b86a832 | 650 | struct btrfs_root *chunk_root = root->fs_info->chunk_root; |
0f7d52f4 | 651 | struct list_head dirty_fs_roots; |
d1310b2e | 652 | struct extent_io_tree *pinned_copy; |
79154b1b | 653 | DEFINE_WAIT(wait); |
15ee9bc7 | 654 | int ret; |
79154b1b | 655 | |
0f7d52f4 | 656 | INIT_LIST_HEAD(&dirty_fs_roots); |
d6e4a428 | 657 | |
79154b1b CM |
658 | mutex_lock(&root->fs_info->trans_mutex); |
659 | if (trans->transaction->in_commit) { | |
660 | cur_trans = trans->transaction; | |
661 | trans->transaction->use_count++; | |
ccd467d6 | 662 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b | 663 | btrfs_end_transaction(trans, root); |
ccd467d6 | 664 | |
79154b1b CM |
665 | ret = wait_for_commit(root, cur_trans); |
666 | BUG_ON(ret); | |
15ee9bc7 JB |
667 | |
668 | mutex_lock(&root->fs_info->trans_mutex); | |
79154b1b | 669 | put_transaction(cur_trans); |
15ee9bc7 JB |
670 | mutex_unlock(&root->fs_info->trans_mutex); |
671 | ||
79154b1b CM |
672 | return 0; |
673 | } | |
4313b399 CM |
674 | |
675 | pinned_copy = kmalloc(sizeof(*pinned_copy), GFP_NOFS); | |
676 | if (!pinned_copy) | |
677 | return -ENOMEM; | |
678 | ||
d1310b2e | 679 | extent_io_tree_init(pinned_copy, |
4313b399 CM |
680 | root->fs_info->btree_inode->i_mapping, GFP_NOFS); |
681 | ||
2c90e5d6 | 682 | trans->transaction->in_commit = 1; |
ccd467d6 CM |
683 | cur_trans = trans->transaction; |
684 | if (cur_trans->list.prev != &root->fs_info->trans_list) { | |
685 | prev_trans = list_entry(cur_trans->list.prev, | |
686 | struct btrfs_transaction, list); | |
687 | if (!prev_trans->commit_done) { | |
688 | prev_trans->use_count++; | |
ccd467d6 CM |
689 | mutex_unlock(&root->fs_info->trans_mutex); |
690 | ||
691 | wait_for_commit(root, prev_trans); | |
ccd467d6 | 692 | |
ccd467d6 | 693 | mutex_lock(&root->fs_info->trans_mutex); |
15ee9bc7 | 694 | put_transaction(prev_trans); |
ccd467d6 CM |
695 | } |
696 | } | |
15ee9bc7 JB |
697 | |
698 | do { | |
699 | joined = cur_trans->num_joined; | |
2c90e5d6 | 700 | WARN_ON(cur_trans != trans->transaction); |
15ee9bc7 | 701 | prepare_to_wait(&cur_trans->writer_wait, &wait, |
79154b1b | 702 | TASK_UNINTERRUPTIBLE); |
15ee9bc7 JB |
703 | |
704 | if (cur_trans->num_writers > 1) | |
705 | timeout = MAX_SCHEDULE_TIMEOUT; | |
706 | else | |
707 | timeout = 1; | |
708 | ||
79154b1b | 709 | mutex_unlock(&root->fs_info->trans_mutex); |
15ee9bc7 JB |
710 | |
711 | schedule_timeout(timeout); | |
712 | ||
79154b1b | 713 | mutex_lock(&root->fs_info->trans_mutex); |
15ee9bc7 | 714 | finish_wait(&cur_trans->writer_wait, &wait); |
dc17ff8f CM |
715 | ret = btrfs_write_ordered_inodes(trans, root); |
716 | ||
15ee9bc7 JB |
717 | } while (cur_trans->num_writers > 1 || |
718 | (cur_trans->num_joined != joined)); | |
719 | ||
3063d29f CM |
720 | ret = create_pending_snapshots(trans, root->fs_info); |
721 | BUG_ON(ret); | |
722 | ||
2c90e5d6 | 723 | WARN_ON(cur_trans != trans->transaction); |
dc17ff8f | 724 | |
54aa1f4d CM |
725 | ret = add_dirty_roots(trans, &root->fs_info->fs_roots_radix, |
726 | &dirty_fs_roots); | |
727 | BUG_ON(ret); | |
728 | ||
79154b1b CM |
729 | ret = btrfs_commit_tree_roots(trans, root); |
730 | BUG_ON(ret); | |
54aa1f4d | 731 | |
78fae27e | 732 | cur_trans = root->fs_info->running_transaction; |
cee36a03 | 733 | spin_lock(&root->fs_info->new_trans_lock); |
78fae27e | 734 | root->fs_info->running_transaction = NULL; |
cee36a03 | 735 | spin_unlock(&root->fs_info->new_trans_lock); |
4b52dff6 CM |
736 | btrfs_set_super_generation(&root->fs_info->super_copy, |
737 | cur_trans->transid); | |
738 | btrfs_set_super_root(&root->fs_info->super_copy, | |
db94535d CM |
739 | root->fs_info->tree_root->node->start); |
740 | btrfs_set_super_root_level(&root->fs_info->super_copy, | |
741 | btrfs_header_level(root->fs_info->tree_root->node)); | |
5f39d397 | 742 | |
0b86a832 CM |
743 | btrfs_set_super_chunk_root(&root->fs_info->super_copy, |
744 | chunk_root->node->start); | |
745 | btrfs_set_super_chunk_root_level(&root->fs_info->super_copy, | |
746 | btrfs_header_level(chunk_root->node)); | |
a061fc8d CM |
747 | memcpy(&root->fs_info->super_for_commit, &root->fs_info->super_copy, |
748 | sizeof(root->fs_info->super_copy)); | |
ccd467d6 | 749 | |
4313b399 | 750 | btrfs_copy_pinned(root, pinned_copy); |
ccd467d6 | 751 | |
78fae27e | 752 | mutex_unlock(&root->fs_info->trans_mutex); |
79154b1b CM |
753 | ret = btrfs_write_and_wait_transaction(trans, root); |
754 | BUG_ON(ret); | |
79154b1b | 755 | write_ctree_super(trans, root); |
4313b399 | 756 | |
4313b399 | 757 | btrfs_finish_extent_commit(trans, root, pinned_copy); |
78fae27e | 758 | mutex_lock(&root->fs_info->trans_mutex); |
4313b399 CM |
759 | |
760 | kfree(pinned_copy); | |
761 | ||
2c90e5d6 | 762 | cur_trans->commit_done = 1; |
15ee9bc7 | 763 | root->fs_info->last_trans_committed = cur_trans->transid; |
2c90e5d6 | 764 | wake_up(&cur_trans->commit_wait); |
78fae27e | 765 | put_transaction(cur_trans); |
79154b1b | 766 | put_transaction(cur_trans); |
58176a96 | 767 | |
facda1e7 CM |
768 | if (root->fs_info->closing) |
769 | list_splice_init(&root->fs_info->dead_roots, &dirty_fs_roots); | |
770 | else | |
771 | list_splice_init(&dirty_fs_roots, &root->fs_info->dead_roots); | |
58176a96 | 772 | |
78fae27e | 773 | mutex_unlock(&root->fs_info->trans_mutex); |
2c90e5d6 | 774 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
79154b1b | 775 | |
facda1e7 | 776 | if (root->fs_info->closing) { |
facda1e7 | 777 | drop_dirty_roots(root->fs_info->tree_root, &dirty_fs_roots); |
facda1e7 | 778 | } |
79154b1b CM |
779 | return ret; |
780 | } | |
781 | ||
e9d0b13b CM |
782 | int btrfs_clean_old_snapshots(struct btrfs_root *root) |
783 | { | |
784 | struct list_head dirty_roots; | |
785 | INIT_LIST_HEAD(&dirty_roots); | |
786 | ||
787 | mutex_lock(&root->fs_info->trans_mutex); | |
788 | list_splice_init(&root->fs_info->dead_roots, &dirty_roots); | |
789 | mutex_unlock(&root->fs_info->trans_mutex); | |
790 | ||
791 | if (!list_empty(&dirty_roots)) { | |
792 | drop_dirty_roots(root, &dirty_roots); | |
793 | } | |
794 | return 0; | |
795 | } | |
6da6abae CM |
796 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
797 | void btrfs_transaction_cleaner(void *p) | |
798 | #else | |
08607c1b | 799 | void btrfs_transaction_cleaner(struct work_struct *work) |
6da6abae | 800 | #endif |
08607c1b | 801 | { |
6da6abae CM |
802 | #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,18) |
803 | struct btrfs_fs_info *fs_info = p; | |
804 | #else | |
08607c1b CM |
805 | struct btrfs_fs_info *fs_info = container_of(work, |
806 | struct btrfs_fs_info, | |
807 | trans_work.work); | |
808 | ||
6da6abae | 809 | #endif |
08607c1b CM |
810 | struct btrfs_root *root = fs_info->tree_root; |
811 | struct btrfs_transaction *cur; | |
812 | struct btrfs_trans_handle *trans; | |
813 | unsigned long now; | |
814 | unsigned long delay = HZ * 30; | |
815 | int ret; | |
816 | ||
a2135011 | 817 | smp_mb(); |
d6bfde87 CM |
818 | if (root->fs_info->closing) |
819 | goto out; | |
820 | ||
08607c1b CM |
821 | mutex_lock(&root->fs_info->trans_mutex); |
822 | cur = root->fs_info->running_transaction; | |
823 | if (!cur) { | |
824 | mutex_unlock(&root->fs_info->trans_mutex); | |
825 | goto out; | |
826 | } | |
827 | now = get_seconds(); | |
828 | if (now < cur->start_time || now - cur->start_time < 30) { | |
829 | mutex_unlock(&root->fs_info->trans_mutex); | |
830 | delay = HZ * 5; | |
831 | goto out; | |
832 | } | |
833 | mutex_unlock(&root->fs_info->trans_mutex); | |
6702ed49 | 834 | btrfs_defrag_dirty_roots(root->fs_info); |
08607c1b CM |
835 | trans = btrfs_start_transaction(root, 1); |
836 | ret = btrfs_commit_transaction(trans, root); | |
837 | out: | |
e9d0b13b | 838 | btrfs_clean_old_snapshots(root); |
08607c1b CM |
839 | btrfs_transaction_queue_work(root, delay); |
840 | } | |
841 | ||
842 | void btrfs_transaction_queue_work(struct btrfs_root *root, int delay) | |
843 | { | |
d6bfde87 CM |
844 | if (!root->fs_info->closing) |
845 | queue_delayed_work(trans_wq, &root->fs_info->trans_work, delay); | |
08607c1b CM |
846 | } |
847 | ||
848 | void btrfs_transaction_flush_work(struct btrfs_root *root) | |
849 | { | |
d6bfde87 | 850 | cancel_delayed_work(&root->fs_info->trans_work); |
08607c1b CM |
851 | flush_workqueue(trans_wq); |
852 | } | |
853 | ||
854 | void __init btrfs_init_transaction_sys(void) | |
855 | { | |
ce9adaa5 | 856 | trans_wq = create_workqueue("btrfs-transaction"); |
08607c1b CM |
857 | } |
858 | ||
17636e03 | 859 | void btrfs_exit_transaction_sys(void) |
08607c1b CM |
860 | { |
861 | destroy_workqueue(trans_wq); | |
862 | } | |
863 |