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> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
34088780 | 21 | #include <linux/sched.h> |
d3c2fdcf | 22 | #include <linux/writeback.h> |
5f39d397 | 23 | #include <linux/pagemap.h> |
5f2cc086 | 24 | #include <linux/blkdev.h> |
8ea05e3a | 25 | #include <linux/uuid.h> |
79154b1b CM |
26 | #include "ctree.h" |
27 | #include "disk-io.h" | |
28 | #include "transaction.h" | |
925baedd | 29 | #include "locking.h" |
e02119d5 | 30 | #include "tree-log.h" |
581bb050 | 31 | #include "inode-map.h" |
733f4fbb | 32 | #include "volumes.h" |
8dabb742 | 33 | #include "dev-replace.h" |
fcebe456 | 34 | #include "qgroup.h" |
79154b1b | 35 | |
0f7d52f4 CM |
36 | #define BTRFS_ROOT_TRANS_TAG 0 |
37 | ||
e8c9f186 | 38 | static const unsigned int btrfs_blocked_trans_types[TRANS_STATE_MAX] = { |
4a9d8bde MX |
39 | [TRANS_STATE_RUNNING] = 0U, |
40 | [TRANS_STATE_BLOCKED] = (__TRANS_USERSPACE | | |
41 | __TRANS_START), | |
42 | [TRANS_STATE_COMMIT_START] = (__TRANS_USERSPACE | | |
43 | __TRANS_START | | |
44 | __TRANS_ATTACH), | |
45 | [TRANS_STATE_COMMIT_DOING] = (__TRANS_USERSPACE | | |
46 | __TRANS_START | | |
47 | __TRANS_ATTACH | | |
48 | __TRANS_JOIN), | |
49 | [TRANS_STATE_UNBLOCKED] = (__TRANS_USERSPACE | | |
50 | __TRANS_START | | |
51 | __TRANS_ATTACH | | |
52 | __TRANS_JOIN | | |
53 | __TRANS_JOIN_NOLOCK), | |
54 | [TRANS_STATE_COMPLETED] = (__TRANS_USERSPACE | | |
55 | __TRANS_START | | |
56 | __TRANS_ATTACH | | |
57 | __TRANS_JOIN | | |
58 | __TRANS_JOIN_NOLOCK), | |
59 | }; | |
60 | ||
724e2315 | 61 | void btrfs_put_transaction(struct btrfs_transaction *transaction) |
79154b1b | 62 | { |
13c5a93e JB |
63 | WARN_ON(atomic_read(&transaction->use_count) == 0); |
64 | if (atomic_dec_and_test(&transaction->use_count)) { | |
a4abeea4 | 65 | BUG_ON(!list_empty(&transaction->list)); |
c46effa6 | 66 | WARN_ON(!RB_EMPTY_ROOT(&transaction->delayed_refs.href_root)); |
1262133b JB |
67 | if (transaction->delayed_refs.pending_csums) |
68 | printk(KERN_ERR "pending csums is %llu\n", | |
69 | transaction->delayed_refs.pending_csums); | |
6df9a95e JB |
70 | while (!list_empty(&transaction->pending_chunks)) { |
71 | struct extent_map *em; | |
72 | ||
73 | em = list_first_entry(&transaction->pending_chunks, | |
74 | struct extent_map, list); | |
75 | list_del_init(&em->list); | |
76 | free_extent_map(em); | |
77 | } | |
7785a663 FM |
78 | /* |
79 | * If any block groups are found in ->deleted_bgs then it's | |
80 | * because the transaction was aborted and a commit did not | |
81 | * happen (things failed before writing the new superblock | |
82 | * and calling btrfs_finish_extent_commit()), so we can not | |
83 | * discard the physical locations of the block groups. | |
84 | */ | |
85 | while (!list_empty(&transaction->deleted_bgs)) { | |
86 | struct btrfs_block_group_cache *cache; | |
87 | ||
88 | cache = list_first_entry(&transaction->deleted_bgs, | |
89 | struct btrfs_block_group_cache, | |
90 | bg_list); | |
91 | list_del_init(&cache->bg_list); | |
92 | btrfs_put_block_group_trimming(cache); | |
93 | btrfs_put_block_group(cache); | |
94 | } | |
2c90e5d6 | 95 | kmem_cache_free(btrfs_transaction_cachep, transaction); |
78fae27e | 96 | } |
79154b1b CM |
97 | } |
98 | ||
663dfbb0 FM |
99 | static void clear_btree_io_tree(struct extent_io_tree *tree) |
100 | { | |
101 | spin_lock(&tree->lock); | |
b666a9cd DS |
102 | /* |
103 | * Do a single barrier for the waitqueue_active check here, the state | |
104 | * of the waitqueue should not change once clear_btree_io_tree is | |
105 | * called. | |
106 | */ | |
107 | smp_mb(); | |
663dfbb0 FM |
108 | while (!RB_EMPTY_ROOT(&tree->state)) { |
109 | struct rb_node *node; | |
110 | struct extent_state *state; | |
111 | ||
112 | node = rb_first(&tree->state); | |
113 | state = rb_entry(node, struct extent_state, rb_node); | |
114 | rb_erase(&state->rb_node, &tree->state); | |
115 | RB_CLEAR_NODE(&state->rb_node); | |
116 | /* | |
117 | * btree io trees aren't supposed to have tasks waiting for | |
118 | * changes in the flags of extent states ever. | |
119 | */ | |
120 | ASSERT(!waitqueue_active(&state->wq)); | |
121 | free_extent_state(state); | |
351810c1 DS |
122 | |
123 | cond_resched_lock(&tree->lock); | |
663dfbb0 FM |
124 | } |
125 | spin_unlock(&tree->lock); | |
126 | } | |
127 | ||
9e351cc8 JB |
128 | static noinline void switch_commit_roots(struct btrfs_transaction *trans, |
129 | struct btrfs_fs_info *fs_info) | |
817d52f8 | 130 | { |
9e351cc8 JB |
131 | struct btrfs_root *root, *tmp; |
132 | ||
133 | down_write(&fs_info->commit_root_sem); | |
134 | list_for_each_entry_safe(root, tmp, &trans->switch_commits, | |
135 | dirty_list) { | |
136 | list_del_init(&root->dirty_list); | |
137 | free_extent_buffer(root->commit_root); | |
138 | root->commit_root = btrfs_root_node(root); | |
139 | if (is_fstree(root->objectid)) | |
140 | btrfs_unpin_free_ino(root); | |
663dfbb0 | 141 | clear_btree_io_tree(&root->dirty_log_pages); |
9e351cc8 | 142 | } |
2b9dbef2 JB |
143 | |
144 | /* We can free old roots now. */ | |
145 | spin_lock(&trans->dropped_roots_lock); | |
146 | while (!list_empty(&trans->dropped_roots)) { | |
147 | root = list_first_entry(&trans->dropped_roots, | |
148 | struct btrfs_root, root_list); | |
149 | list_del_init(&root->root_list); | |
150 | spin_unlock(&trans->dropped_roots_lock); | |
151 | btrfs_drop_and_free_fs_root(fs_info, root); | |
152 | spin_lock(&trans->dropped_roots_lock); | |
153 | } | |
154 | spin_unlock(&trans->dropped_roots_lock); | |
9e351cc8 | 155 | up_write(&fs_info->commit_root_sem); |
817d52f8 JB |
156 | } |
157 | ||
0860adfd MX |
158 | static inline void extwriter_counter_inc(struct btrfs_transaction *trans, |
159 | unsigned int type) | |
160 | { | |
161 | if (type & TRANS_EXTWRITERS) | |
162 | atomic_inc(&trans->num_extwriters); | |
163 | } | |
164 | ||
165 | static inline void extwriter_counter_dec(struct btrfs_transaction *trans, | |
166 | unsigned int type) | |
167 | { | |
168 | if (type & TRANS_EXTWRITERS) | |
169 | atomic_dec(&trans->num_extwriters); | |
170 | } | |
171 | ||
172 | static inline void extwriter_counter_init(struct btrfs_transaction *trans, | |
173 | unsigned int type) | |
174 | { | |
175 | atomic_set(&trans->num_extwriters, ((type & TRANS_EXTWRITERS) ? 1 : 0)); | |
176 | } | |
177 | ||
178 | static inline int extwriter_counter_read(struct btrfs_transaction *trans) | |
179 | { | |
180 | return atomic_read(&trans->num_extwriters); | |
178260b2 MX |
181 | } |
182 | ||
d352ac68 CM |
183 | /* |
184 | * either allocate a new transaction or hop into the existing one | |
185 | */ | |
0860adfd | 186 | static noinline int join_transaction(struct btrfs_root *root, unsigned int type) |
79154b1b CM |
187 | { |
188 | struct btrfs_transaction *cur_trans; | |
19ae4e81 | 189 | struct btrfs_fs_info *fs_info = root->fs_info; |
a4abeea4 | 190 | |
19ae4e81 | 191 | spin_lock(&fs_info->trans_lock); |
d43317dc | 192 | loop: |
49b25e05 | 193 | /* The file system has been taken offline. No new transactions. */ |
87533c47 | 194 | if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
19ae4e81 | 195 | spin_unlock(&fs_info->trans_lock); |
49b25e05 JM |
196 | return -EROFS; |
197 | } | |
198 | ||
19ae4e81 | 199 | cur_trans = fs_info->running_transaction; |
a4abeea4 | 200 | if (cur_trans) { |
871383be | 201 | if (cur_trans->aborted) { |
19ae4e81 | 202 | spin_unlock(&fs_info->trans_lock); |
49b25e05 | 203 | return cur_trans->aborted; |
871383be | 204 | } |
4a9d8bde | 205 | if (btrfs_blocked_trans_types[cur_trans->state] & type) { |
178260b2 MX |
206 | spin_unlock(&fs_info->trans_lock); |
207 | return -EBUSY; | |
208 | } | |
a4abeea4 | 209 | atomic_inc(&cur_trans->use_count); |
13c5a93e | 210 | atomic_inc(&cur_trans->num_writers); |
0860adfd | 211 | extwriter_counter_inc(cur_trans, type); |
19ae4e81 | 212 | spin_unlock(&fs_info->trans_lock); |
a4abeea4 | 213 | return 0; |
79154b1b | 214 | } |
19ae4e81 | 215 | spin_unlock(&fs_info->trans_lock); |
a4abeea4 | 216 | |
354aa0fb MX |
217 | /* |
218 | * If we are ATTACH, we just want to catch the current transaction, | |
219 | * and commit it. If there is no transaction, just return ENOENT. | |
220 | */ | |
221 | if (type == TRANS_ATTACH) | |
222 | return -ENOENT; | |
223 | ||
4a9d8bde MX |
224 | /* |
225 | * JOIN_NOLOCK only happens during the transaction commit, so | |
226 | * it is impossible that ->running_transaction is NULL | |
227 | */ | |
228 | BUG_ON(type == TRANS_JOIN_NOLOCK); | |
229 | ||
a4abeea4 JB |
230 | cur_trans = kmem_cache_alloc(btrfs_transaction_cachep, GFP_NOFS); |
231 | if (!cur_trans) | |
232 | return -ENOMEM; | |
d43317dc | 233 | |
19ae4e81 JS |
234 | spin_lock(&fs_info->trans_lock); |
235 | if (fs_info->running_transaction) { | |
d43317dc CM |
236 | /* |
237 | * someone started a transaction after we unlocked. Make sure | |
4a9d8bde | 238 | * to redo the checks above |
d43317dc | 239 | */ |
a4abeea4 | 240 | kmem_cache_free(btrfs_transaction_cachep, cur_trans); |
d43317dc | 241 | goto loop; |
87533c47 | 242 | } else if (test_bit(BTRFS_FS_STATE_ERROR, &fs_info->fs_state)) { |
e4b50e14 | 243 | spin_unlock(&fs_info->trans_lock); |
7b8b92af JB |
244 | kmem_cache_free(btrfs_transaction_cachep, cur_trans); |
245 | return -EROFS; | |
79154b1b | 246 | } |
d43317dc | 247 | |
a4abeea4 | 248 | atomic_set(&cur_trans->num_writers, 1); |
0860adfd | 249 | extwriter_counter_init(cur_trans, type); |
a4abeea4 JB |
250 | init_waitqueue_head(&cur_trans->writer_wait); |
251 | init_waitqueue_head(&cur_trans->commit_wait); | |
161c3549 | 252 | init_waitqueue_head(&cur_trans->pending_wait); |
4a9d8bde | 253 | cur_trans->state = TRANS_STATE_RUNNING; |
a4abeea4 JB |
254 | /* |
255 | * One for this trans handle, one so it will live on until we | |
256 | * commit the transaction. | |
257 | */ | |
258 | atomic_set(&cur_trans->use_count, 2); | |
161c3549 | 259 | atomic_set(&cur_trans->pending_ordered, 0); |
3204d33c | 260 | cur_trans->flags = 0; |
a4abeea4 JB |
261 | cur_trans->start_time = get_seconds(); |
262 | ||
a099d0fd AM |
263 | memset(&cur_trans->delayed_refs, 0, sizeof(cur_trans->delayed_refs)); |
264 | ||
c46effa6 | 265 | cur_trans->delayed_refs.href_root = RB_ROOT; |
3368d001 | 266 | cur_trans->delayed_refs.dirty_extent_root = RB_ROOT; |
d7df2c79 | 267 | atomic_set(&cur_trans->delayed_refs.num_entries, 0); |
20b297d6 JS |
268 | |
269 | /* | |
270 | * although the tree mod log is per file system and not per transaction, | |
271 | * the log must never go across transaction boundaries. | |
272 | */ | |
273 | smp_mb(); | |
31b1a2bd | 274 | if (!list_empty(&fs_info->tree_mod_seq_list)) |
efe120a0 | 275 | WARN(1, KERN_ERR "BTRFS: tree_mod_seq_list not empty when " |
20b297d6 | 276 | "creating a fresh transaction\n"); |
31b1a2bd | 277 | if (!RB_EMPTY_ROOT(&fs_info->tree_mod_log)) |
efe120a0 | 278 | WARN(1, KERN_ERR "BTRFS: tree_mod_log rb tree not empty when " |
20b297d6 | 279 | "creating a fresh transaction\n"); |
fc36ed7e | 280 | atomic64_set(&fs_info->tree_mod_seq, 0); |
20b297d6 | 281 | |
a4abeea4 JB |
282 | spin_lock_init(&cur_trans->delayed_refs.lock); |
283 | ||
284 | INIT_LIST_HEAD(&cur_trans->pending_snapshots); | |
6df9a95e | 285 | INIT_LIST_HEAD(&cur_trans->pending_chunks); |
9e351cc8 | 286 | INIT_LIST_HEAD(&cur_trans->switch_commits); |
ce93ec54 | 287 | INIT_LIST_HEAD(&cur_trans->dirty_bgs); |
1bbc621e | 288 | INIT_LIST_HEAD(&cur_trans->io_bgs); |
2b9dbef2 | 289 | INIT_LIST_HEAD(&cur_trans->dropped_roots); |
1bbc621e | 290 | mutex_init(&cur_trans->cache_write_mutex); |
cb723e49 | 291 | cur_trans->num_dirty_bgs = 0; |
ce93ec54 | 292 | spin_lock_init(&cur_trans->dirty_bgs_lock); |
e33e17ee | 293 | INIT_LIST_HEAD(&cur_trans->deleted_bgs); |
2b9dbef2 | 294 | spin_lock_init(&cur_trans->dropped_roots_lock); |
19ae4e81 | 295 | list_add_tail(&cur_trans->list, &fs_info->trans_list); |
a4abeea4 | 296 | extent_io_tree_init(&cur_trans->dirty_pages, |
19ae4e81 JS |
297 | fs_info->btree_inode->i_mapping); |
298 | fs_info->generation++; | |
299 | cur_trans->transid = fs_info->generation; | |
300 | fs_info->running_transaction = cur_trans; | |
49b25e05 | 301 | cur_trans->aborted = 0; |
19ae4e81 | 302 | spin_unlock(&fs_info->trans_lock); |
15ee9bc7 | 303 | |
79154b1b CM |
304 | return 0; |
305 | } | |
306 | ||
d352ac68 | 307 | /* |
d397712b CM |
308 | * this does all the record keeping required to make sure that a reference |
309 | * counted root is properly recorded in a given transaction. This is required | |
310 | * to make sure the old root from before we joined the transaction is deleted | |
311 | * when the transaction commits | |
d352ac68 | 312 | */ |
7585717f | 313 | static int record_root_in_trans(struct btrfs_trans_handle *trans, |
6426c7ad QW |
314 | struct btrfs_root *root, |
315 | int force) | |
6702ed49 | 316 | { |
6426c7ad QW |
317 | if ((test_bit(BTRFS_ROOT_REF_COWS, &root->state) && |
318 | root->last_trans < trans->transid) || force) { | |
6702ed49 | 319 | WARN_ON(root == root->fs_info->extent_root); |
5d4f98a2 YZ |
320 | WARN_ON(root->commit_root != root->node); |
321 | ||
7585717f | 322 | /* |
27cdeb70 | 323 | * see below for IN_TRANS_SETUP usage rules |
7585717f CM |
324 | * we have the reloc mutex held now, so there |
325 | * is only one writer in this function | |
326 | */ | |
27cdeb70 | 327 | set_bit(BTRFS_ROOT_IN_TRANS_SETUP, &root->state); |
7585717f | 328 | |
27cdeb70 | 329 | /* make sure readers find IN_TRANS_SETUP before |
7585717f CM |
330 | * they find our root->last_trans update |
331 | */ | |
332 | smp_wmb(); | |
333 | ||
a4abeea4 | 334 | spin_lock(&root->fs_info->fs_roots_radix_lock); |
6426c7ad | 335 | if (root->last_trans == trans->transid && !force) { |
a4abeea4 JB |
336 | spin_unlock(&root->fs_info->fs_roots_radix_lock); |
337 | return 0; | |
338 | } | |
5d4f98a2 YZ |
339 | radix_tree_tag_set(&root->fs_info->fs_roots_radix, |
340 | (unsigned long)root->root_key.objectid, | |
341 | BTRFS_ROOT_TRANS_TAG); | |
a4abeea4 | 342 | spin_unlock(&root->fs_info->fs_roots_radix_lock); |
7585717f CM |
343 | root->last_trans = trans->transid; |
344 | ||
345 | /* this is pretty tricky. We don't want to | |
346 | * take the relocation lock in btrfs_record_root_in_trans | |
347 | * unless we're really doing the first setup for this root in | |
348 | * this transaction. | |
349 | * | |
350 | * Normally we'd use root->last_trans as a flag to decide | |
351 | * if we want to take the expensive mutex. | |
352 | * | |
353 | * But, we have to set root->last_trans before we | |
354 | * init the relocation root, otherwise, we trip over warnings | |
355 | * in ctree.c. The solution used here is to flag ourselves | |
27cdeb70 | 356 | * with root IN_TRANS_SETUP. When this is 1, we're still |
7585717f CM |
357 | * fixing up the reloc trees and everyone must wait. |
358 | * | |
359 | * When this is zero, they can trust root->last_trans and fly | |
360 | * through btrfs_record_root_in_trans without having to take the | |
361 | * lock. smp_wmb() makes sure that all the writes above are | |
362 | * done before we pop in the zero below | |
363 | */ | |
5d4f98a2 | 364 | btrfs_init_reloc_root(trans, root); |
c7548af6 | 365 | smp_mb__before_atomic(); |
27cdeb70 | 366 | clear_bit(BTRFS_ROOT_IN_TRANS_SETUP, &root->state); |
5d4f98a2 YZ |
367 | } |
368 | return 0; | |
369 | } | |
bcc63abb | 370 | |
7585717f | 371 | |
2b9dbef2 JB |
372 | void btrfs_add_dropped_root(struct btrfs_trans_handle *trans, |
373 | struct btrfs_root *root) | |
374 | { | |
375 | struct btrfs_transaction *cur_trans = trans->transaction; | |
376 | ||
377 | /* Add ourselves to the transaction dropped list */ | |
378 | spin_lock(&cur_trans->dropped_roots_lock); | |
379 | list_add_tail(&root->root_list, &cur_trans->dropped_roots); | |
380 | spin_unlock(&cur_trans->dropped_roots_lock); | |
381 | ||
382 | /* Make sure we don't try to update the root at commit time */ | |
383 | spin_lock(&root->fs_info->fs_roots_radix_lock); | |
384 | radix_tree_tag_clear(&root->fs_info->fs_roots_radix, | |
385 | (unsigned long)root->root_key.objectid, | |
386 | BTRFS_ROOT_TRANS_TAG); | |
387 | spin_unlock(&root->fs_info->fs_roots_radix_lock); | |
388 | } | |
389 | ||
7585717f CM |
390 | int btrfs_record_root_in_trans(struct btrfs_trans_handle *trans, |
391 | struct btrfs_root *root) | |
392 | { | |
27cdeb70 | 393 | if (!test_bit(BTRFS_ROOT_REF_COWS, &root->state)) |
7585717f CM |
394 | return 0; |
395 | ||
396 | /* | |
27cdeb70 | 397 | * see record_root_in_trans for comments about IN_TRANS_SETUP usage |
7585717f CM |
398 | * and barriers |
399 | */ | |
400 | smp_rmb(); | |
401 | if (root->last_trans == trans->transid && | |
27cdeb70 | 402 | !test_bit(BTRFS_ROOT_IN_TRANS_SETUP, &root->state)) |
7585717f CM |
403 | return 0; |
404 | ||
405 | mutex_lock(&root->fs_info->reloc_mutex); | |
6426c7ad | 406 | record_root_in_trans(trans, root, 0); |
7585717f CM |
407 | mutex_unlock(&root->fs_info->reloc_mutex); |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
4a9d8bde MX |
412 | static inline int is_transaction_blocked(struct btrfs_transaction *trans) |
413 | { | |
414 | return (trans->state >= TRANS_STATE_BLOCKED && | |
501407aa JB |
415 | trans->state < TRANS_STATE_UNBLOCKED && |
416 | !trans->aborted); | |
4a9d8bde MX |
417 | } |
418 | ||
d352ac68 CM |
419 | /* wait for commit against the current transaction to become unblocked |
420 | * when this is done, it is safe to start a new transaction, but the current | |
421 | * transaction might not be fully on disk. | |
422 | */ | |
37d1aeee | 423 | static void wait_current_trans(struct btrfs_root *root) |
79154b1b | 424 | { |
f9295749 | 425 | struct btrfs_transaction *cur_trans; |
79154b1b | 426 | |
a4abeea4 | 427 | spin_lock(&root->fs_info->trans_lock); |
f9295749 | 428 | cur_trans = root->fs_info->running_transaction; |
4a9d8bde | 429 | if (cur_trans && is_transaction_blocked(cur_trans)) { |
13c5a93e | 430 | atomic_inc(&cur_trans->use_count); |
a4abeea4 | 431 | spin_unlock(&root->fs_info->trans_lock); |
72d63ed6 LZ |
432 | |
433 | wait_event(root->fs_info->transaction_wait, | |
501407aa JB |
434 | cur_trans->state >= TRANS_STATE_UNBLOCKED || |
435 | cur_trans->aborted); | |
724e2315 | 436 | btrfs_put_transaction(cur_trans); |
a4abeea4 JB |
437 | } else { |
438 | spin_unlock(&root->fs_info->trans_lock); | |
f9295749 | 439 | } |
37d1aeee CM |
440 | } |
441 | ||
a22285a6 YZ |
442 | static int may_wait_transaction(struct btrfs_root *root, int type) |
443 | { | |
a4abeea4 JB |
444 | if (root->fs_info->log_root_recovering) |
445 | return 0; | |
446 | ||
447 | if (type == TRANS_USERSPACE) | |
448 | return 1; | |
449 | ||
450 | if (type == TRANS_START && | |
451 | !atomic_read(&root->fs_info->open_ioctl_trans)) | |
a22285a6 | 452 | return 1; |
a4abeea4 | 453 | |
a22285a6 YZ |
454 | return 0; |
455 | } | |
456 | ||
20dd2cbf MX |
457 | static inline bool need_reserve_reloc_root(struct btrfs_root *root) |
458 | { | |
459 | if (!root->fs_info->reloc_ctl || | |
27cdeb70 | 460 | !test_bit(BTRFS_ROOT_REF_COWS, &root->state) || |
20dd2cbf MX |
461 | root->root_key.objectid == BTRFS_TREE_RELOC_OBJECTID || |
462 | root->reloc_root) | |
463 | return false; | |
464 | ||
465 | return true; | |
466 | } | |
467 | ||
08e007d2 | 468 | static struct btrfs_trans_handle * |
5aed1dd8 AM |
469 | start_transaction(struct btrfs_root *root, unsigned int num_items, |
470 | unsigned int type, enum btrfs_reserve_flush_enum flush) | |
37d1aeee | 471 | { |
a22285a6 YZ |
472 | struct btrfs_trans_handle *h; |
473 | struct btrfs_transaction *cur_trans; | |
b5009945 | 474 | u64 num_bytes = 0; |
c5567237 | 475 | u64 qgroup_reserved = 0; |
20dd2cbf MX |
476 | bool reloc_reserved = false; |
477 | int ret; | |
acce952b | 478 | |
46c4e71e | 479 | /* Send isn't supposed to start transactions. */ |
2755a0de | 480 | ASSERT(current->journal_info != BTRFS_SEND_TRANS_STUB); |
46c4e71e | 481 | |
87533c47 | 482 | if (test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) |
acce952b | 483 | return ERR_PTR(-EROFS); |
2a1eb461 | 484 | |
46c4e71e | 485 | if (current->journal_info) { |
0860adfd | 486 | WARN_ON(type & TRANS_EXTWRITERS); |
2a1eb461 JB |
487 | h = current->journal_info; |
488 | h->use_count++; | |
b7d5b0a8 | 489 | WARN_ON(h->use_count > 2); |
2a1eb461 JB |
490 | h->orig_rsv = h->block_rsv; |
491 | h->block_rsv = NULL; | |
492 | goto got_it; | |
493 | } | |
b5009945 JB |
494 | |
495 | /* | |
496 | * Do the reservation before we join the transaction so we can do all | |
497 | * the appropriate flushing if need be. | |
498 | */ | |
499 | if (num_items > 0 && root != root->fs_info->chunk_root) { | |
7174109c QW |
500 | qgroup_reserved = num_items * root->nodesize; |
501 | ret = btrfs_qgroup_reserve_meta(root, qgroup_reserved); | |
502 | if (ret) | |
503 | return ERR_PTR(ret); | |
c5567237 | 504 | |
b5009945 | 505 | num_bytes = btrfs_calc_trans_metadata_size(root, num_items); |
20dd2cbf MX |
506 | /* |
507 | * Do the reservation for the relocation root creation | |
508 | */ | |
ee39b432 | 509 | if (need_reserve_reloc_root(root)) { |
20dd2cbf MX |
510 | num_bytes += root->nodesize; |
511 | reloc_reserved = true; | |
512 | } | |
513 | ||
08e007d2 MX |
514 | ret = btrfs_block_rsv_add(root, |
515 | &root->fs_info->trans_block_rsv, | |
516 | num_bytes, flush); | |
b5009945 | 517 | if (ret) |
843fcf35 | 518 | goto reserve_fail; |
b5009945 | 519 | } |
a22285a6 | 520 | again: |
f2f767e7 | 521 | h = kmem_cache_zalloc(btrfs_trans_handle_cachep, GFP_NOFS); |
843fcf35 MX |
522 | if (!h) { |
523 | ret = -ENOMEM; | |
524 | goto alloc_fail; | |
525 | } | |
37d1aeee | 526 | |
98114659 JB |
527 | /* |
528 | * If we are JOIN_NOLOCK we're already committing a transaction and | |
529 | * waiting on this guy, so we don't need to do the sb_start_intwrite | |
530 | * because we're already holding a ref. We need this because we could | |
531 | * have raced in and did an fsync() on a file which can kick a commit | |
532 | * and then we deadlock with somebody doing a freeze. | |
354aa0fb MX |
533 | * |
534 | * If we are ATTACH, it means we just want to catch the current | |
535 | * transaction and commit it, so we needn't do sb_start_intwrite(). | |
98114659 | 536 | */ |
0860adfd | 537 | if (type & __TRANS_FREEZABLE) |
60376ce4 | 538 | sb_start_intwrite(root->fs_info->sb); |
b2b5ef5c | 539 | |
a22285a6 | 540 | if (may_wait_transaction(root, type)) |
37d1aeee | 541 | wait_current_trans(root); |
a22285a6 | 542 | |
a4abeea4 | 543 | do { |
354aa0fb | 544 | ret = join_transaction(root, type); |
178260b2 | 545 | if (ret == -EBUSY) { |
a4abeea4 | 546 | wait_current_trans(root); |
178260b2 MX |
547 | if (unlikely(type == TRANS_ATTACH)) |
548 | ret = -ENOENT; | |
549 | } | |
a4abeea4 JB |
550 | } while (ret == -EBUSY); |
551 | ||
db5b493a | 552 | if (ret < 0) { |
354aa0fb MX |
553 | /* We must get the transaction if we are JOIN_NOLOCK. */ |
554 | BUG_ON(type == TRANS_JOIN_NOLOCK); | |
843fcf35 | 555 | goto join_fail; |
db5b493a | 556 | } |
0f7d52f4 | 557 | |
a22285a6 | 558 | cur_trans = root->fs_info->running_transaction; |
a22285a6 YZ |
559 | |
560 | h->transid = cur_trans->transid; | |
561 | h->transaction = cur_trans; | |
d13603ef | 562 | h->root = root; |
2a1eb461 | 563 | h->use_count = 1; |
7174109c | 564 | |
a698d075 | 565 | h->type = type; |
d9a0540a | 566 | h->can_flush_pending_bgs = true; |
bed92eae | 567 | INIT_LIST_HEAD(&h->qgroup_ref_list); |
ea658bad | 568 | INIT_LIST_HEAD(&h->new_bgs); |
b7ec40d7 | 569 | |
a22285a6 | 570 | smp_mb(); |
4a9d8bde MX |
571 | if (cur_trans->state >= TRANS_STATE_BLOCKED && |
572 | may_wait_transaction(root, type)) { | |
abdd2e80 | 573 | current->journal_info = h; |
a22285a6 YZ |
574 | btrfs_commit_transaction(h, root); |
575 | goto again; | |
576 | } | |
577 | ||
b5009945 | 578 | if (num_bytes) { |
8c2a3ca2 | 579 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
2bcc0328 | 580 | h->transid, num_bytes, 1); |
b5009945 JB |
581 | h->block_rsv = &root->fs_info->trans_block_rsv; |
582 | h->bytes_reserved = num_bytes; | |
20dd2cbf | 583 | h->reloc_reserved = reloc_reserved; |
a22285a6 | 584 | } |
9ed74f2d | 585 | |
2a1eb461 | 586 | got_it: |
a4abeea4 | 587 | btrfs_record_root_in_trans(h, root); |
a22285a6 YZ |
588 | |
589 | if (!current->journal_info && type != TRANS_USERSPACE) | |
590 | current->journal_info = h; | |
79154b1b | 591 | return h; |
843fcf35 MX |
592 | |
593 | join_fail: | |
0860adfd | 594 | if (type & __TRANS_FREEZABLE) |
843fcf35 MX |
595 | sb_end_intwrite(root->fs_info->sb); |
596 | kmem_cache_free(btrfs_trans_handle_cachep, h); | |
597 | alloc_fail: | |
598 | if (num_bytes) | |
599 | btrfs_block_rsv_release(root, &root->fs_info->trans_block_rsv, | |
600 | num_bytes); | |
601 | reserve_fail: | |
7174109c | 602 | btrfs_qgroup_free_meta(root, qgroup_reserved); |
843fcf35 | 603 | return ERR_PTR(ret); |
79154b1b CM |
604 | } |
605 | ||
f9295749 | 606 | struct btrfs_trans_handle *btrfs_start_transaction(struct btrfs_root *root, |
5aed1dd8 | 607 | unsigned int num_items) |
f9295749 | 608 | { |
08e007d2 MX |
609 | return start_transaction(root, num_items, TRANS_START, |
610 | BTRFS_RESERVE_FLUSH_ALL); | |
f9295749 | 611 | } |
8eab77ff FM |
612 | struct btrfs_trans_handle *btrfs_start_transaction_fallback_global_rsv( |
613 | struct btrfs_root *root, | |
614 | unsigned int num_items, | |
615 | int min_factor) | |
616 | { | |
617 | struct btrfs_trans_handle *trans; | |
618 | u64 num_bytes; | |
619 | int ret; | |
620 | ||
621 | trans = btrfs_start_transaction(root, num_items); | |
622 | if (!IS_ERR(trans) || PTR_ERR(trans) != -ENOSPC) | |
623 | return trans; | |
624 | ||
625 | trans = btrfs_start_transaction(root, 0); | |
626 | if (IS_ERR(trans)) | |
627 | return trans; | |
628 | ||
629 | num_bytes = btrfs_calc_trans_metadata_size(root, num_items); | |
630 | ret = btrfs_cond_migrate_bytes(root->fs_info, | |
631 | &root->fs_info->trans_block_rsv, | |
632 | num_bytes, | |
633 | min_factor); | |
634 | if (ret) { | |
635 | btrfs_end_transaction(trans, root); | |
636 | return ERR_PTR(ret); | |
637 | } | |
638 | ||
639 | trans->block_rsv = &root->fs_info->trans_block_rsv; | |
640 | trans->bytes_reserved = num_bytes; | |
88d3a5aa JB |
641 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
642 | trans->transid, num_bytes, 1); | |
8eab77ff FM |
643 | |
644 | return trans; | |
645 | } | |
8407aa46 | 646 | |
08e007d2 | 647 | struct btrfs_trans_handle *btrfs_start_transaction_lflush( |
5aed1dd8 AM |
648 | struct btrfs_root *root, |
649 | unsigned int num_items) | |
8407aa46 | 650 | { |
08e007d2 MX |
651 | return start_transaction(root, num_items, TRANS_START, |
652 | BTRFS_RESERVE_FLUSH_LIMIT); | |
8407aa46 MX |
653 | } |
654 | ||
7a7eaa40 | 655 | struct btrfs_trans_handle *btrfs_join_transaction(struct btrfs_root *root) |
f9295749 | 656 | { |
575a75d6 AM |
657 | return start_transaction(root, 0, TRANS_JOIN, |
658 | BTRFS_RESERVE_NO_FLUSH); | |
f9295749 CM |
659 | } |
660 | ||
7a7eaa40 | 661 | struct btrfs_trans_handle *btrfs_join_transaction_nolock(struct btrfs_root *root) |
0af3d00b | 662 | { |
575a75d6 AM |
663 | return start_transaction(root, 0, TRANS_JOIN_NOLOCK, |
664 | BTRFS_RESERVE_NO_FLUSH); | |
0af3d00b JB |
665 | } |
666 | ||
7a7eaa40 | 667 | struct btrfs_trans_handle *btrfs_start_ioctl_transaction(struct btrfs_root *root) |
9ca9ee09 | 668 | { |
575a75d6 AM |
669 | return start_transaction(root, 0, TRANS_USERSPACE, |
670 | BTRFS_RESERVE_NO_FLUSH); | |
9ca9ee09 SW |
671 | } |
672 | ||
d4edf39b MX |
673 | /* |
674 | * btrfs_attach_transaction() - catch the running transaction | |
675 | * | |
676 | * It is used when we want to commit the current the transaction, but | |
677 | * don't want to start a new one. | |
678 | * | |
679 | * Note: If this function return -ENOENT, it just means there is no | |
680 | * running transaction. But it is possible that the inactive transaction | |
681 | * is still in the memory, not fully on disk. If you hope there is no | |
682 | * inactive transaction in the fs when -ENOENT is returned, you should | |
683 | * invoke | |
684 | * btrfs_attach_transaction_barrier() | |
685 | */ | |
354aa0fb | 686 | struct btrfs_trans_handle *btrfs_attach_transaction(struct btrfs_root *root) |
60376ce4 | 687 | { |
575a75d6 AM |
688 | return start_transaction(root, 0, TRANS_ATTACH, |
689 | BTRFS_RESERVE_NO_FLUSH); | |
60376ce4 JB |
690 | } |
691 | ||
d4edf39b | 692 | /* |
90b6d283 | 693 | * btrfs_attach_transaction_barrier() - catch the running transaction |
d4edf39b MX |
694 | * |
695 | * It is similar to the above function, the differentia is this one | |
696 | * will wait for all the inactive transactions until they fully | |
697 | * complete. | |
698 | */ | |
699 | struct btrfs_trans_handle * | |
700 | btrfs_attach_transaction_barrier(struct btrfs_root *root) | |
701 | { | |
702 | struct btrfs_trans_handle *trans; | |
703 | ||
575a75d6 AM |
704 | trans = start_transaction(root, 0, TRANS_ATTACH, |
705 | BTRFS_RESERVE_NO_FLUSH); | |
d4edf39b MX |
706 | if (IS_ERR(trans) && PTR_ERR(trans) == -ENOENT) |
707 | btrfs_wait_for_commit(root, 0); | |
708 | ||
709 | return trans; | |
710 | } | |
711 | ||
d352ac68 | 712 | /* wait for a transaction commit to be fully complete */ |
b9c8300c | 713 | static noinline void wait_for_commit(struct btrfs_root *root, |
89ce8a63 CM |
714 | struct btrfs_transaction *commit) |
715 | { | |
4a9d8bde | 716 | wait_event(commit->commit_wait, commit->state == TRANS_STATE_COMPLETED); |
89ce8a63 CM |
717 | } |
718 | ||
46204592 SW |
719 | int btrfs_wait_for_commit(struct btrfs_root *root, u64 transid) |
720 | { | |
721 | struct btrfs_transaction *cur_trans = NULL, *t; | |
8cd2807f | 722 | int ret = 0; |
46204592 | 723 | |
46204592 SW |
724 | if (transid) { |
725 | if (transid <= root->fs_info->last_trans_committed) | |
a4abeea4 | 726 | goto out; |
46204592 SW |
727 | |
728 | /* find specified transaction */ | |
a4abeea4 | 729 | spin_lock(&root->fs_info->trans_lock); |
46204592 SW |
730 | list_for_each_entry(t, &root->fs_info->trans_list, list) { |
731 | if (t->transid == transid) { | |
732 | cur_trans = t; | |
a4abeea4 | 733 | atomic_inc(&cur_trans->use_count); |
8cd2807f | 734 | ret = 0; |
46204592 SW |
735 | break; |
736 | } | |
8cd2807f MX |
737 | if (t->transid > transid) { |
738 | ret = 0; | |
46204592 | 739 | break; |
8cd2807f | 740 | } |
46204592 | 741 | } |
a4abeea4 | 742 | spin_unlock(&root->fs_info->trans_lock); |
42383020 SW |
743 | |
744 | /* | |
745 | * The specified transaction doesn't exist, or we | |
746 | * raced with btrfs_commit_transaction | |
747 | */ | |
748 | if (!cur_trans) { | |
749 | if (transid > root->fs_info->last_trans_committed) | |
750 | ret = -EINVAL; | |
8cd2807f | 751 | goto out; |
42383020 | 752 | } |
46204592 SW |
753 | } else { |
754 | /* find newest transaction that is committing | committed */ | |
a4abeea4 | 755 | spin_lock(&root->fs_info->trans_lock); |
46204592 SW |
756 | list_for_each_entry_reverse(t, &root->fs_info->trans_list, |
757 | list) { | |
4a9d8bde MX |
758 | if (t->state >= TRANS_STATE_COMMIT_START) { |
759 | if (t->state == TRANS_STATE_COMPLETED) | |
3473f3c0 | 760 | break; |
46204592 | 761 | cur_trans = t; |
a4abeea4 | 762 | atomic_inc(&cur_trans->use_count); |
46204592 SW |
763 | break; |
764 | } | |
765 | } | |
a4abeea4 | 766 | spin_unlock(&root->fs_info->trans_lock); |
46204592 | 767 | if (!cur_trans) |
a4abeea4 | 768 | goto out; /* nothing committing|committed */ |
46204592 SW |
769 | } |
770 | ||
46204592 | 771 | wait_for_commit(root, cur_trans); |
724e2315 | 772 | btrfs_put_transaction(cur_trans); |
a4abeea4 | 773 | out: |
46204592 SW |
774 | return ret; |
775 | } | |
776 | ||
37d1aeee CM |
777 | void btrfs_throttle(struct btrfs_root *root) |
778 | { | |
a4abeea4 | 779 | if (!atomic_read(&root->fs_info->open_ioctl_trans)) |
9ca9ee09 | 780 | wait_current_trans(root); |
37d1aeee CM |
781 | } |
782 | ||
8929ecfa YZ |
783 | static int should_end_transaction(struct btrfs_trans_handle *trans, |
784 | struct btrfs_root *root) | |
785 | { | |
1be41b78 | 786 | if (root->fs_info->global_block_rsv.space_info->full && |
0a2b2a84 | 787 | btrfs_check_space_for_delayed_refs(trans, root)) |
1be41b78 | 788 | return 1; |
36ba022a | 789 | |
1be41b78 | 790 | return !!btrfs_block_rsv_check(root, &root->fs_info->global_block_rsv, 5); |
8929ecfa YZ |
791 | } |
792 | ||
793 | int btrfs_should_end_transaction(struct btrfs_trans_handle *trans, | |
794 | struct btrfs_root *root) | |
795 | { | |
796 | struct btrfs_transaction *cur_trans = trans->transaction; | |
797 | int updates; | |
49b25e05 | 798 | int err; |
8929ecfa | 799 | |
a4abeea4 | 800 | smp_mb(); |
4a9d8bde MX |
801 | if (cur_trans->state >= TRANS_STATE_BLOCKED || |
802 | cur_trans->delayed_refs.flushing) | |
8929ecfa YZ |
803 | return 1; |
804 | ||
805 | updates = trans->delayed_ref_updates; | |
806 | trans->delayed_ref_updates = 0; | |
49b25e05 | 807 | if (updates) { |
28ed1345 | 808 | err = btrfs_run_delayed_refs(trans, root, updates * 2); |
49b25e05 JM |
809 | if (err) /* Error code will also eval true */ |
810 | return err; | |
811 | } | |
8929ecfa YZ |
812 | |
813 | return should_end_transaction(trans, root); | |
814 | } | |
815 | ||
89ce8a63 | 816 | static int __btrfs_end_transaction(struct btrfs_trans_handle *trans, |
a698d075 | 817 | struct btrfs_root *root, int throttle) |
79154b1b | 818 | { |
8929ecfa | 819 | struct btrfs_transaction *cur_trans = trans->transaction; |
ab78c84d | 820 | struct btrfs_fs_info *info = root->fs_info; |
31b9655f | 821 | u64 transid = trans->transid; |
1be41b78 | 822 | unsigned long cur = trans->delayed_ref_updates; |
a698d075 | 823 | int lock = (trans->type != TRANS_JOIN_NOLOCK); |
4edc2ca3 | 824 | int err = 0; |
a79b7d4b | 825 | int must_run_delayed_refs = 0; |
c3e69d58 | 826 | |
3bbb24b2 JB |
827 | if (trans->use_count > 1) { |
828 | trans->use_count--; | |
2a1eb461 JB |
829 | trans->block_rsv = trans->orig_rsv; |
830 | return 0; | |
831 | } | |
832 | ||
b24e03db | 833 | btrfs_trans_release_metadata(trans, root); |
4c13d758 | 834 | trans->block_rsv = NULL; |
c5567237 | 835 | |
ea658bad JB |
836 | if (!list_empty(&trans->new_bgs)) |
837 | btrfs_create_pending_block_groups(trans, root); | |
838 | ||
1be41b78 | 839 | trans->delayed_ref_updates = 0; |
a79b7d4b CM |
840 | if (!trans->sync) { |
841 | must_run_delayed_refs = | |
842 | btrfs_should_throttle_delayed_refs(trans, root); | |
0a2b2a84 | 843 | cur = max_t(unsigned long, cur, 32); |
a79b7d4b CM |
844 | |
845 | /* | |
846 | * don't make the caller wait if they are from a NOLOCK | |
847 | * or ATTACH transaction, it will deadlock with commit | |
848 | */ | |
849 | if (must_run_delayed_refs == 1 && | |
850 | (trans->type & (__TRANS_JOIN_NOLOCK | __TRANS_ATTACH))) | |
851 | must_run_delayed_refs = 2; | |
56bec294 | 852 | } |
bb721703 | 853 | |
0e721106 JB |
854 | btrfs_trans_release_metadata(trans, root); |
855 | trans->block_rsv = NULL; | |
56bec294 | 856 | |
ea658bad JB |
857 | if (!list_empty(&trans->new_bgs)) |
858 | btrfs_create_pending_block_groups(trans, root); | |
859 | ||
4fbcdf66 FM |
860 | btrfs_trans_release_chunk_metadata(trans); |
861 | ||
a4abeea4 | 862 | if (lock && !atomic_read(&root->fs_info->open_ioctl_trans) && |
4a9d8bde MX |
863 | should_end_transaction(trans, root) && |
864 | ACCESS_ONCE(cur_trans->state) == TRANS_STATE_RUNNING) { | |
865 | spin_lock(&info->trans_lock); | |
866 | if (cur_trans->state == TRANS_STATE_RUNNING) | |
867 | cur_trans->state = TRANS_STATE_BLOCKED; | |
868 | spin_unlock(&info->trans_lock); | |
a4abeea4 | 869 | } |
8929ecfa | 870 | |
4a9d8bde | 871 | if (lock && ACCESS_ONCE(cur_trans->state) == TRANS_STATE_BLOCKED) { |
3bbb24b2 | 872 | if (throttle) |
8929ecfa | 873 | return btrfs_commit_transaction(trans, root); |
3bbb24b2 | 874 | else |
8929ecfa YZ |
875 | wake_up_process(info->transaction_kthread); |
876 | } | |
877 | ||
0860adfd | 878 | if (trans->type & __TRANS_FREEZABLE) |
98114659 | 879 | sb_end_intwrite(root->fs_info->sb); |
6df7881a | 880 | |
8929ecfa | 881 | WARN_ON(cur_trans != info->running_transaction); |
13c5a93e JB |
882 | WARN_ON(atomic_read(&cur_trans->num_writers) < 1); |
883 | atomic_dec(&cur_trans->num_writers); | |
0860adfd | 884 | extwriter_counter_dec(cur_trans, trans->type); |
89ce8a63 | 885 | |
a83342aa DS |
886 | /* |
887 | * Make sure counter is updated before we wake up waiters. | |
888 | */ | |
99d16cbc | 889 | smp_mb(); |
79154b1b CM |
890 | if (waitqueue_active(&cur_trans->writer_wait)) |
891 | wake_up(&cur_trans->writer_wait); | |
724e2315 | 892 | btrfs_put_transaction(cur_trans); |
9ed74f2d JB |
893 | |
894 | if (current->journal_info == trans) | |
895 | current->journal_info = NULL; | |
ab78c84d | 896 | |
24bbcf04 YZ |
897 | if (throttle) |
898 | btrfs_run_delayed_iputs(root); | |
899 | ||
49b25e05 | 900 | if (trans->aborted || |
4e121c06 JB |
901 | test_bit(BTRFS_FS_STATE_ERROR, &root->fs_info->fs_state)) { |
902 | wake_up_process(info->transaction_kthread); | |
4edc2ca3 | 903 | err = -EIO; |
4e121c06 | 904 | } |
edf39272 | 905 | assert_qgroups_uptodate(trans); |
49b25e05 | 906 | |
4edc2ca3 | 907 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
a79b7d4b | 908 | if (must_run_delayed_refs) { |
31b9655f | 909 | btrfs_async_run_delayed_refs(root, cur, transid, |
a79b7d4b CM |
910 | must_run_delayed_refs == 1); |
911 | } | |
4edc2ca3 | 912 | return err; |
79154b1b CM |
913 | } |
914 | ||
89ce8a63 CM |
915 | int btrfs_end_transaction(struct btrfs_trans_handle *trans, |
916 | struct btrfs_root *root) | |
917 | { | |
98ad43be | 918 | return __btrfs_end_transaction(trans, root, 0); |
89ce8a63 CM |
919 | } |
920 | ||
921 | int btrfs_end_transaction_throttle(struct btrfs_trans_handle *trans, | |
922 | struct btrfs_root *root) | |
923 | { | |
98ad43be | 924 | return __btrfs_end_transaction(trans, root, 1); |
16cdcec7 MX |
925 | } |
926 | ||
d352ac68 CM |
927 | /* |
928 | * when btree blocks are allocated, they have some corresponding bits set for | |
929 | * them in one of two extent_io trees. This is used to make sure all of | |
690587d1 | 930 | * those extents are sent to disk but does not wait on them |
d352ac68 | 931 | */ |
690587d1 | 932 | int btrfs_write_marked_extents(struct btrfs_root *root, |
8cef4e16 | 933 | struct extent_io_tree *dirty_pages, int mark) |
79154b1b | 934 | { |
777e6bd7 | 935 | int err = 0; |
7c4452b9 | 936 | int werr = 0; |
1728366e | 937 | struct address_space *mapping = root->fs_info->btree_inode->i_mapping; |
e6138876 | 938 | struct extent_state *cached_state = NULL; |
777e6bd7 | 939 | u64 start = 0; |
5f39d397 | 940 | u64 end; |
7c4452b9 | 941 | |
1728366e | 942 | while (!find_first_extent_bit(dirty_pages, start, &start, &end, |
e6138876 | 943 | mark, &cached_state)) { |
663dfbb0 FM |
944 | bool wait_writeback = false; |
945 | ||
946 | err = convert_extent_bit(dirty_pages, start, end, | |
947 | EXTENT_NEED_WAIT, | |
210aa277 | 948 | mark, &cached_state); |
663dfbb0 FM |
949 | /* |
950 | * convert_extent_bit can return -ENOMEM, which is most of the | |
951 | * time a temporary error. So when it happens, ignore the error | |
952 | * and wait for writeback of this range to finish - because we | |
953 | * failed to set the bit EXTENT_NEED_WAIT for the range, a call | |
954 | * to btrfs_wait_marked_extents() would not know that writeback | |
955 | * for this range started and therefore wouldn't wait for it to | |
956 | * finish - we don't want to commit a superblock that points to | |
957 | * btree nodes/leafs for which writeback hasn't finished yet | |
958 | * (and without errors). | |
959 | * We cleanup any entries left in the io tree when committing | |
960 | * the transaction (through clear_btree_io_tree()). | |
961 | */ | |
962 | if (err == -ENOMEM) { | |
963 | err = 0; | |
964 | wait_writeback = true; | |
965 | } | |
966 | if (!err) | |
967 | err = filemap_fdatawrite_range(mapping, start, end); | |
1728366e JB |
968 | if (err) |
969 | werr = err; | |
663dfbb0 FM |
970 | else if (wait_writeback) |
971 | werr = filemap_fdatawait_range(mapping, start, end); | |
e38e2ed7 | 972 | free_extent_state(cached_state); |
663dfbb0 | 973 | cached_state = NULL; |
1728366e JB |
974 | cond_resched(); |
975 | start = end + 1; | |
7c4452b9 | 976 | } |
690587d1 CM |
977 | return werr; |
978 | } | |
979 | ||
980 | /* | |
981 | * when btree blocks are allocated, they have some corresponding bits set for | |
982 | * them in one of two extent_io trees. This is used to make sure all of | |
983 | * those extents are on disk for transaction or log commit. We wait | |
984 | * on all the pages and clear them from the dirty pages state tree | |
985 | */ | |
986 | int btrfs_wait_marked_extents(struct btrfs_root *root, | |
8cef4e16 | 987 | struct extent_io_tree *dirty_pages, int mark) |
690587d1 | 988 | { |
690587d1 CM |
989 | int err = 0; |
990 | int werr = 0; | |
1728366e | 991 | struct address_space *mapping = root->fs_info->btree_inode->i_mapping; |
e6138876 | 992 | struct extent_state *cached_state = NULL; |
690587d1 CM |
993 | u64 start = 0; |
994 | u64 end; | |
656f30db FM |
995 | struct btrfs_inode *btree_ino = BTRFS_I(root->fs_info->btree_inode); |
996 | bool errors = false; | |
777e6bd7 | 997 | |
1728366e | 998 | while (!find_first_extent_bit(dirty_pages, start, &start, &end, |
e6138876 | 999 | EXTENT_NEED_WAIT, &cached_state)) { |
663dfbb0 FM |
1000 | /* |
1001 | * Ignore -ENOMEM errors returned by clear_extent_bit(). | |
1002 | * When committing the transaction, we'll remove any entries | |
1003 | * left in the io tree. For a log commit, we don't remove them | |
1004 | * after committing the log because the tree can be accessed | |
1005 | * concurrently - we do it only at transaction commit time when | |
1006 | * it's safe to do it (through clear_btree_io_tree()). | |
1007 | */ | |
1008 | err = clear_extent_bit(dirty_pages, start, end, | |
1009 | EXTENT_NEED_WAIT, | |
1010 | 0, 0, &cached_state, GFP_NOFS); | |
1011 | if (err == -ENOMEM) | |
1012 | err = 0; | |
1013 | if (!err) | |
1014 | err = filemap_fdatawait_range(mapping, start, end); | |
1728366e JB |
1015 | if (err) |
1016 | werr = err; | |
e38e2ed7 FM |
1017 | free_extent_state(cached_state); |
1018 | cached_state = NULL; | |
1728366e JB |
1019 | cond_resched(); |
1020 | start = end + 1; | |
777e6bd7 | 1021 | } |
7c4452b9 CM |
1022 | if (err) |
1023 | werr = err; | |
656f30db FM |
1024 | |
1025 | if (root->root_key.objectid == BTRFS_TREE_LOG_OBJECTID) { | |
1026 | if ((mark & EXTENT_DIRTY) && | |
1027 | test_and_clear_bit(BTRFS_INODE_BTREE_LOG1_ERR, | |
1028 | &btree_ino->runtime_flags)) | |
1029 | errors = true; | |
1030 | ||
1031 | if ((mark & EXTENT_NEW) && | |
1032 | test_and_clear_bit(BTRFS_INODE_BTREE_LOG2_ERR, | |
1033 | &btree_ino->runtime_flags)) | |
1034 | errors = true; | |
1035 | } else { | |
1036 | if (test_and_clear_bit(BTRFS_INODE_BTREE_ERR, | |
1037 | &btree_ino->runtime_flags)) | |
1038 | errors = true; | |
1039 | } | |
1040 | ||
1041 | if (errors && !werr) | |
1042 | werr = -EIO; | |
1043 | ||
7c4452b9 | 1044 | return werr; |
79154b1b CM |
1045 | } |
1046 | ||
690587d1 CM |
1047 | /* |
1048 | * when btree blocks are allocated, they have some corresponding bits set for | |
1049 | * them in one of two extent_io trees. This is used to make sure all of | |
1050 | * those extents are on disk for transaction or log commit | |
1051 | */ | |
171170c1 | 1052 | static int btrfs_write_and_wait_marked_extents(struct btrfs_root *root, |
8cef4e16 | 1053 | struct extent_io_tree *dirty_pages, int mark) |
690587d1 CM |
1054 | { |
1055 | int ret; | |
1056 | int ret2; | |
c6adc9cc | 1057 | struct blk_plug plug; |
690587d1 | 1058 | |
c6adc9cc | 1059 | blk_start_plug(&plug); |
8cef4e16 | 1060 | ret = btrfs_write_marked_extents(root, dirty_pages, mark); |
c6adc9cc | 1061 | blk_finish_plug(&plug); |
8cef4e16 | 1062 | ret2 = btrfs_wait_marked_extents(root, dirty_pages, mark); |
bf0da8c1 CM |
1063 | |
1064 | if (ret) | |
1065 | return ret; | |
1066 | if (ret2) | |
1067 | return ret2; | |
1068 | return 0; | |
690587d1 CM |
1069 | } |
1070 | ||
663dfbb0 | 1071 | static int btrfs_write_and_wait_transaction(struct btrfs_trans_handle *trans, |
d0c803c4 CM |
1072 | struct btrfs_root *root) |
1073 | { | |
663dfbb0 FM |
1074 | int ret; |
1075 | ||
1076 | ret = btrfs_write_and_wait_marked_extents(root, | |
8cef4e16 YZ |
1077 | &trans->transaction->dirty_pages, |
1078 | EXTENT_DIRTY); | |
663dfbb0 FM |
1079 | clear_btree_io_tree(&trans->transaction->dirty_pages); |
1080 | ||
1081 | return ret; | |
d0c803c4 CM |
1082 | } |
1083 | ||
d352ac68 CM |
1084 | /* |
1085 | * this is used to update the root pointer in the tree of tree roots. | |
1086 | * | |
1087 | * But, in the case of the extent allocation tree, updating the root | |
1088 | * pointer may allocate blocks which may change the root of the extent | |
1089 | * allocation tree. | |
1090 | * | |
1091 | * So, this loops and repeats and makes sure the cowonly root didn't | |
1092 | * change while the root pointer was being updated in the metadata. | |
1093 | */ | |
0b86a832 CM |
1094 | static int update_cowonly_root(struct btrfs_trans_handle *trans, |
1095 | struct btrfs_root *root) | |
79154b1b CM |
1096 | { |
1097 | int ret; | |
0b86a832 | 1098 | u64 old_root_bytenr; |
86b9f2ec | 1099 | u64 old_root_used; |
0b86a832 | 1100 | struct btrfs_root *tree_root = root->fs_info->tree_root; |
79154b1b | 1101 | |
86b9f2ec | 1102 | old_root_used = btrfs_root_used(&root->root_item); |
56bec294 | 1103 | |
d397712b | 1104 | while (1) { |
0b86a832 | 1105 | old_root_bytenr = btrfs_root_bytenr(&root->root_item); |
86b9f2ec | 1106 | if (old_root_bytenr == root->node->start && |
ea526d18 | 1107 | old_root_used == btrfs_root_used(&root->root_item)) |
79154b1b | 1108 | break; |
87ef2bb4 | 1109 | |
5d4f98a2 | 1110 | btrfs_set_root_node(&root->root_item, root->node); |
79154b1b | 1111 | ret = btrfs_update_root(trans, tree_root, |
0b86a832 CM |
1112 | &root->root_key, |
1113 | &root->root_item); | |
49b25e05 JM |
1114 | if (ret) |
1115 | return ret; | |
56bec294 | 1116 | |
86b9f2ec | 1117 | old_root_used = btrfs_root_used(&root->root_item); |
0b86a832 | 1118 | } |
276e680d | 1119 | |
0b86a832 CM |
1120 | return 0; |
1121 | } | |
1122 | ||
d352ac68 CM |
1123 | /* |
1124 | * update all the cowonly tree roots on disk | |
49b25e05 JM |
1125 | * |
1126 | * The error handling in this function may not be obvious. Any of the | |
1127 | * failures will cause the file system to go offline. We still need | |
1128 | * to clean up the delayed refs. | |
d352ac68 | 1129 | */ |
5d4f98a2 YZ |
1130 | static noinline int commit_cowonly_roots(struct btrfs_trans_handle *trans, |
1131 | struct btrfs_root *root) | |
0b86a832 CM |
1132 | { |
1133 | struct btrfs_fs_info *fs_info = root->fs_info; | |
ea526d18 | 1134 | struct list_head *dirty_bgs = &trans->transaction->dirty_bgs; |
1bbc621e | 1135 | struct list_head *io_bgs = &trans->transaction->io_bgs; |
0b86a832 | 1136 | struct list_head *next; |
84234f3a | 1137 | struct extent_buffer *eb; |
56bec294 | 1138 | int ret; |
84234f3a YZ |
1139 | |
1140 | eb = btrfs_lock_root_node(fs_info->tree_root); | |
49b25e05 JM |
1141 | ret = btrfs_cow_block(trans, fs_info->tree_root, eb, NULL, |
1142 | 0, &eb); | |
84234f3a YZ |
1143 | btrfs_tree_unlock(eb); |
1144 | free_extent_buffer(eb); | |
0b86a832 | 1145 | |
49b25e05 JM |
1146 | if (ret) |
1147 | return ret; | |
1148 | ||
56bec294 | 1149 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
49b25e05 JM |
1150 | if (ret) |
1151 | return ret; | |
87ef2bb4 | 1152 | |
733f4fbb | 1153 | ret = btrfs_run_dev_stats(trans, root->fs_info); |
c16ce190 JB |
1154 | if (ret) |
1155 | return ret; | |
8dabb742 | 1156 | ret = btrfs_run_dev_replace(trans, root->fs_info); |
c16ce190 JB |
1157 | if (ret) |
1158 | return ret; | |
546adb0d | 1159 | ret = btrfs_run_qgroups(trans, root->fs_info); |
c16ce190 JB |
1160 | if (ret) |
1161 | return ret; | |
546adb0d | 1162 | |
dcdf7f6d JB |
1163 | ret = btrfs_setup_space_cache(trans, root); |
1164 | if (ret) | |
1165 | return ret; | |
1166 | ||
546adb0d JS |
1167 | /* run_qgroups might have added some more refs */ |
1168 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); | |
c16ce190 JB |
1169 | if (ret) |
1170 | return ret; | |
ea526d18 | 1171 | again: |
d397712b | 1172 | while (!list_empty(&fs_info->dirty_cowonly_roots)) { |
0b86a832 CM |
1173 | next = fs_info->dirty_cowonly_roots.next; |
1174 | list_del_init(next); | |
1175 | root = list_entry(next, struct btrfs_root, dirty_list); | |
e7070be1 | 1176 | clear_bit(BTRFS_ROOT_DIRTY, &root->state); |
87ef2bb4 | 1177 | |
9e351cc8 JB |
1178 | if (root != fs_info->extent_root) |
1179 | list_add_tail(&root->dirty_list, | |
1180 | &trans->transaction->switch_commits); | |
49b25e05 JM |
1181 | ret = update_cowonly_root(trans, root); |
1182 | if (ret) | |
1183 | return ret; | |
ea526d18 JB |
1184 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
1185 | if (ret) | |
1186 | return ret; | |
79154b1b | 1187 | } |
276e680d | 1188 | |
1bbc621e | 1189 | while (!list_empty(dirty_bgs) || !list_empty(io_bgs)) { |
ea526d18 JB |
1190 | ret = btrfs_write_dirty_block_groups(trans, root); |
1191 | if (ret) | |
1192 | return ret; | |
1193 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); | |
1194 | if (ret) | |
1195 | return ret; | |
1196 | } | |
1197 | ||
1198 | if (!list_empty(&fs_info->dirty_cowonly_roots)) | |
1199 | goto again; | |
1200 | ||
9e351cc8 JB |
1201 | list_add_tail(&fs_info->extent_root->dirty_list, |
1202 | &trans->transaction->switch_commits); | |
8dabb742 SB |
1203 | btrfs_after_dev_replace_commit(fs_info); |
1204 | ||
79154b1b CM |
1205 | return 0; |
1206 | } | |
1207 | ||
d352ac68 CM |
1208 | /* |
1209 | * dead roots are old snapshots that need to be deleted. This allocates | |
1210 | * a dirty root struct and adds it into the list of dead roots that need to | |
1211 | * be deleted | |
1212 | */ | |
cfad392b | 1213 | void btrfs_add_dead_root(struct btrfs_root *root) |
5eda7b5e | 1214 | { |
a4abeea4 | 1215 | spin_lock(&root->fs_info->trans_lock); |
cfad392b JB |
1216 | if (list_empty(&root->root_list)) |
1217 | list_add_tail(&root->root_list, &root->fs_info->dead_roots); | |
a4abeea4 | 1218 | spin_unlock(&root->fs_info->trans_lock); |
5eda7b5e CM |
1219 | } |
1220 | ||
d352ac68 | 1221 | /* |
5d4f98a2 | 1222 | * update all the cowonly tree roots on disk |
d352ac68 | 1223 | */ |
5d4f98a2 YZ |
1224 | static noinline int commit_fs_roots(struct btrfs_trans_handle *trans, |
1225 | struct btrfs_root *root) | |
0f7d52f4 | 1226 | { |
0f7d52f4 | 1227 | struct btrfs_root *gang[8]; |
5d4f98a2 | 1228 | struct btrfs_fs_info *fs_info = root->fs_info; |
0f7d52f4 CM |
1229 | int i; |
1230 | int ret; | |
54aa1f4d CM |
1231 | int err = 0; |
1232 | ||
a4abeea4 | 1233 | spin_lock(&fs_info->fs_roots_radix_lock); |
d397712b | 1234 | while (1) { |
5d4f98a2 YZ |
1235 | ret = radix_tree_gang_lookup_tag(&fs_info->fs_roots_radix, |
1236 | (void **)gang, 0, | |
0f7d52f4 CM |
1237 | ARRAY_SIZE(gang), |
1238 | BTRFS_ROOT_TRANS_TAG); | |
1239 | if (ret == 0) | |
1240 | break; | |
1241 | for (i = 0; i < ret; i++) { | |
1242 | root = gang[i]; | |
5d4f98a2 YZ |
1243 | radix_tree_tag_clear(&fs_info->fs_roots_radix, |
1244 | (unsigned long)root->root_key.objectid, | |
1245 | BTRFS_ROOT_TRANS_TAG); | |
a4abeea4 | 1246 | spin_unlock(&fs_info->fs_roots_radix_lock); |
31153d81 | 1247 | |
e02119d5 | 1248 | btrfs_free_log(trans, root); |
5d4f98a2 | 1249 | btrfs_update_reloc_root(trans, root); |
d68fc57b | 1250 | btrfs_orphan_commit_root(trans, root); |
bcc63abb | 1251 | |
82d5902d LZ |
1252 | btrfs_save_ino_cache(root, trans); |
1253 | ||
f1ebcc74 | 1254 | /* see comments in should_cow_block() */ |
27cdeb70 | 1255 | clear_bit(BTRFS_ROOT_FORCE_COW, &root->state); |
c7548af6 | 1256 | smp_mb__after_atomic(); |
f1ebcc74 | 1257 | |
978d910d | 1258 | if (root->commit_root != root->node) { |
9e351cc8 JB |
1259 | list_add_tail(&root->dirty_list, |
1260 | &trans->transaction->switch_commits); | |
978d910d YZ |
1261 | btrfs_set_root_node(&root->root_item, |
1262 | root->node); | |
1263 | } | |
5d4f98a2 | 1264 | |
5d4f98a2 | 1265 | err = btrfs_update_root(trans, fs_info->tree_root, |
0f7d52f4 CM |
1266 | &root->root_key, |
1267 | &root->root_item); | |
a4abeea4 | 1268 | spin_lock(&fs_info->fs_roots_radix_lock); |
54aa1f4d CM |
1269 | if (err) |
1270 | break; | |
7174109c | 1271 | btrfs_qgroup_free_meta_all(root); |
0f7d52f4 CM |
1272 | } |
1273 | } | |
a4abeea4 | 1274 | spin_unlock(&fs_info->fs_roots_radix_lock); |
54aa1f4d | 1275 | return err; |
0f7d52f4 CM |
1276 | } |
1277 | ||
d352ac68 | 1278 | /* |
de78b51a ES |
1279 | * defrag a given btree. |
1280 | * Every leaf in the btree is read and defragged. | |
d352ac68 | 1281 | */ |
de78b51a | 1282 | int btrfs_defrag_root(struct btrfs_root *root) |
e9d0b13b CM |
1283 | { |
1284 | struct btrfs_fs_info *info = root->fs_info; | |
e9d0b13b | 1285 | struct btrfs_trans_handle *trans; |
8929ecfa | 1286 | int ret; |
e9d0b13b | 1287 | |
27cdeb70 | 1288 | if (test_and_set_bit(BTRFS_ROOT_DEFRAG_RUNNING, &root->state)) |
e9d0b13b | 1289 | return 0; |
8929ecfa | 1290 | |
6b80053d | 1291 | while (1) { |
8929ecfa YZ |
1292 | trans = btrfs_start_transaction(root, 0); |
1293 | if (IS_ERR(trans)) | |
1294 | return PTR_ERR(trans); | |
1295 | ||
de78b51a | 1296 | ret = btrfs_defrag_leaves(trans, root); |
8929ecfa | 1297 | |
e9d0b13b | 1298 | btrfs_end_transaction(trans, root); |
b53d3f5d | 1299 | btrfs_btree_balance_dirty(info->tree_root); |
e9d0b13b CM |
1300 | cond_resched(); |
1301 | ||
7841cb28 | 1302 | if (btrfs_fs_closing(root->fs_info) || ret != -EAGAIN) |
e9d0b13b | 1303 | break; |
210549eb DS |
1304 | |
1305 | if (btrfs_defrag_cancelled(root->fs_info)) { | |
efe120a0 | 1306 | pr_debug("BTRFS: defrag_root cancelled\n"); |
210549eb DS |
1307 | ret = -EAGAIN; |
1308 | break; | |
1309 | } | |
e9d0b13b | 1310 | } |
27cdeb70 | 1311 | clear_bit(BTRFS_ROOT_DEFRAG_RUNNING, &root->state); |
8929ecfa | 1312 | return ret; |
e9d0b13b CM |
1313 | } |
1314 | ||
6426c7ad QW |
1315 | /* |
1316 | * Do all special snapshot related qgroup dirty hack. | |
1317 | * | |
1318 | * Will do all needed qgroup inherit and dirty hack like switch commit | |
1319 | * roots inside one transaction and write all btree into disk, to make | |
1320 | * qgroup works. | |
1321 | */ | |
1322 | static int qgroup_account_snapshot(struct btrfs_trans_handle *trans, | |
1323 | struct btrfs_root *src, | |
1324 | struct btrfs_root *parent, | |
1325 | struct btrfs_qgroup_inherit *inherit, | |
1326 | u64 dst_objectid) | |
1327 | { | |
1328 | struct btrfs_fs_info *fs_info = src->fs_info; | |
1329 | int ret; | |
1330 | ||
1331 | /* | |
1332 | * Save some performance in the case that qgroups are not | |
1333 | * enabled. If this check races with the ioctl, rescan will | |
1334 | * kick in anyway. | |
1335 | */ | |
1336 | mutex_lock(&fs_info->qgroup_ioctl_lock); | |
1337 | if (!fs_info->quota_enabled) { | |
1338 | mutex_unlock(&fs_info->qgroup_ioctl_lock); | |
1339 | return 0; | |
1340 | } | |
1341 | mutex_unlock(&fs_info->qgroup_ioctl_lock); | |
1342 | ||
1343 | /* | |
1344 | * We are going to commit transaction, see btrfs_commit_transaction() | |
1345 | * comment for reason locking tree_log_mutex | |
1346 | */ | |
1347 | mutex_lock(&fs_info->tree_log_mutex); | |
1348 | ||
1349 | ret = commit_fs_roots(trans, src); | |
1350 | if (ret) | |
1351 | goto out; | |
1352 | ret = btrfs_qgroup_prepare_account_extents(trans, fs_info); | |
1353 | if (ret < 0) | |
1354 | goto out; | |
1355 | ret = btrfs_qgroup_account_extents(trans, fs_info); | |
1356 | if (ret < 0) | |
1357 | goto out; | |
1358 | ||
1359 | /* Now qgroup are all updated, we can inherit it to new qgroups */ | |
1360 | ret = btrfs_qgroup_inherit(trans, fs_info, | |
1361 | src->root_key.objectid, dst_objectid, | |
1362 | inherit); | |
1363 | if (ret < 0) | |
1364 | goto out; | |
1365 | ||
1366 | /* | |
1367 | * Now we do a simplified commit transaction, which will: | |
1368 | * 1) commit all subvolume and extent tree | |
1369 | * To ensure all subvolume and extent tree have a valid | |
1370 | * commit_root to accounting later insert_dir_item() | |
1371 | * 2) write all btree blocks onto disk | |
1372 | * This is to make sure later btree modification will be cowed | |
1373 | * Or commit_root can be populated and cause wrong qgroup numbers | |
1374 | * In this simplified commit, we don't really care about other trees | |
1375 | * like chunk and root tree, as they won't affect qgroup. | |
1376 | * And we don't write super to avoid half committed status. | |
1377 | */ | |
1378 | ret = commit_cowonly_roots(trans, src); | |
1379 | if (ret) | |
1380 | goto out; | |
1381 | switch_commit_roots(trans->transaction, fs_info); | |
1382 | ret = btrfs_write_and_wait_transaction(trans, src); | |
1383 | if (ret) | |
f7af3934 | 1384 | btrfs_handle_fs_error(fs_info, ret, |
6426c7ad QW |
1385 | "Error while writing out transaction for qgroup"); |
1386 | ||
1387 | out: | |
1388 | mutex_unlock(&fs_info->tree_log_mutex); | |
1389 | ||
1390 | /* | |
1391 | * Force parent root to be updated, as we recorded it before so its | |
1392 | * last_trans == cur_transid. | |
1393 | * Or it won't be committed again onto disk after later | |
1394 | * insert_dir_item() | |
1395 | */ | |
1396 | if (!ret) | |
1397 | record_root_in_trans(trans, parent, 1); | |
1398 | return ret; | |
1399 | } | |
1400 | ||
d352ac68 CM |
1401 | /* |
1402 | * new snapshots need to be created at a very specific time in the | |
aec8030a MX |
1403 | * transaction commit. This does the actual creation. |
1404 | * | |
1405 | * Note: | |
1406 | * If the error which may affect the commitment of the current transaction | |
1407 | * happens, we should return the error number. If the error which just affect | |
1408 | * the creation of the pending snapshots, just return 0. | |
d352ac68 | 1409 | */ |
80b6794d | 1410 | static noinline int create_pending_snapshot(struct btrfs_trans_handle *trans, |
3063d29f CM |
1411 | struct btrfs_fs_info *fs_info, |
1412 | struct btrfs_pending_snapshot *pending) | |
1413 | { | |
1414 | struct btrfs_key key; | |
80b6794d | 1415 | struct btrfs_root_item *new_root_item; |
3063d29f CM |
1416 | struct btrfs_root *tree_root = fs_info->tree_root; |
1417 | struct btrfs_root *root = pending->root; | |
6bdb72de | 1418 | struct btrfs_root *parent_root; |
98c9942a | 1419 | struct btrfs_block_rsv *rsv; |
6bdb72de | 1420 | struct inode *parent_inode; |
42874b3d MX |
1421 | struct btrfs_path *path; |
1422 | struct btrfs_dir_item *dir_item; | |
a22285a6 | 1423 | struct dentry *dentry; |
3063d29f | 1424 | struct extent_buffer *tmp; |
925baedd | 1425 | struct extent_buffer *old; |
04b285f3 | 1426 | struct timespec cur_time; |
aec8030a | 1427 | int ret = 0; |
d68fc57b | 1428 | u64 to_reserve = 0; |
6bdb72de | 1429 | u64 index = 0; |
a22285a6 | 1430 | u64 objectid; |
b83cc969 | 1431 | u64 root_flags; |
8ea05e3a | 1432 | uuid_le new_uuid; |
3063d29f | 1433 | |
8546b570 DS |
1434 | ASSERT(pending->path); |
1435 | path = pending->path; | |
42874b3d | 1436 | |
b0c0ea63 DS |
1437 | ASSERT(pending->root_item); |
1438 | new_root_item = pending->root_item; | |
a22285a6 | 1439 | |
aec8030a MX |
1440 | pending->error = btrfs_find_free_objectid(tree_root, &objectid); |
1441 | if (pending->error) | |
6fa9700e | 1442 | goto no_free_objectid; |
3063d29f | 1443 | |
d6726335 QW |
1444 | /* |
1445 | * Make qgroup to skip current new snapshot's qgroupid, as it is | |
1446 | * accounted by later btrfs_qgroup_inherit(). | |
1447 | */ | |
1448 | btrfs_set_skip_qgroup(trans, objectid); | |
1449 | ||
147d256e | 1450 | btrfs_reloc_pre_snapshot(pending, &to_reserve); |
d68fc57b YZ |
1451 | |
1452 | if (to_reserve > 0) { | |
aec8030a MX |
1453 | pending->error = btrfs_block_rsv_add(root, |
1454 | &pending->block_rsv, | |
1455 | to_reserve, | |
1456 | BTRFS_RESERVE_NO_FLUSH); | |
1457 | if (pending->error) | |
d6726335 | 1458 | goto clear_skip_qgroup; |
d68fc57b YZ |
1459 | } |
1460 | ||
3063d29f | 1461 | key.objectid = objectid; |
a22285a6 YZ |
1462 | key.offset = (u64)-1; |
1463 | key.type = BTRFS_ROOT_ITEM_KEY; | |
3063d29f | 1464 | |
6fa9700e | 1465 | rsv = trans->block_rsv; |
a22285a6 | 1466 | trans->block_rsv = &pending->block_rsv; |
2382c5cc | 1467 | trans->bytes_reserved = trans->block_rsv->reserved; |
88d3a5aa JB |
1468 | trace_btrfs_space_reservation(root->fs_info, "transaction", |
1469 | trans->transid, | |
1470 | trans->bytes_reserved, 1); | |
a22285a6 | 1471 | dentry = pending->dentry; |
e9662f70 | 1472 | parent_inode = pending->dir; |
a22285a6 | 1473 | parent_root = BTRFS_I(parent_inode)->root; |
6426c7ad | 1474 | record_root_in_trans(trans, parent_root, 0); |
a22285a6 | 1475 | |
04b285f3 DD |
1476 | cur_time = current_fs_time(parent_inode->i_sb); |
1477 | ||
3063d29f CM |
1478 | /* |
1479 | * insert the directory item | |
1480 | */ | |
3de4586c | 1481 | ret = btrfs_set_inode_index(parent_inode, &index); |
49b25e05 | 1482 | BUG_ON(ret); /* -ENOMEM */ |
42874b3d MX |
1483 | |
1484 | /* check if there is a file/dir which has the same name. */ | |
1485 | dir_item = btrfs_lookup_dir_item(NULL, parent_root, path, | |
1486 | btrfs_ino(parent_inode), | |
1487 | dentry->d_name.name, | |
1488 | dentry->d_name.len, 0); | |
1489 | if (dir_item != NULL && !IS_ERR(dir_item)) { | |
fe66a05a | 1490 | pending->error = -EEXIST; |
aec8030a | 1491 | goto dir_item_existed; |
42874b3d MX |
1492 | } else if (IS_ERR(dir_item)) { |
1493 | ret = PTR_ERR(dir_item); | |
8732d44f MX |
1494 | btrfs_abort_transaction(trans, root, ret); |
1495 | goto fail; | |
79787eaa | 1496 | } |
42874b3d | 1497 | btrfs_release_path(path); |
52c26179 | 1498 | |
e999376f CM |
1499 | /* |
1500 | * pull in the delayed directory update | |
1501 | * and the delayed inode item | |
1502 | * otherwise we corrupt the FS during | |
1503 | * snapshot | |
1504 | */ | |
1505 | ret = btrfs_run_delayed_items(trans, root); | |
8732d44f MX |
1506 | if (ret) { /* Transaction aborted */ |
1507 | btrfs_abort_transaction(trans, root, ret); | |
1508 | goto fail; | |
1509 | } | |
e999376f | 1510 | |
6426c7ad | 1511 | record_root_in_trans(trans, root, 0); |
6bdb72de SW |
1512 | btrfs_set_root_last_snapshot(&root->root_item, trans->transid); |
1513 | memcpy(new_root_item, &root->root_item, sizeof(*new_root_item)); | |
08fe4db1 | 1514 | btrfs_check_and_init_root_item(new_root_item); |
6bdb72de | 1515 | |
b83cc969 LZ |
1516 | root_flags = btrfs_root_flags(new_root_item); |
1517 | if (pending->readonly) | |
1518 | root_flags |= BTRFS_ROOT_SUBVOL_RDONLY; | |
1519 | else | |
1520 | root_flags &= ~BTRFS_ROOT_SUBVOL_RDONLY; | |
1521 | btrfs_set_root_flags(new_root_item, root_flags); | |
1522 | ||
8ea05e3a AB |
1523 | btrfs_set_root_generation_v2(new_root_item, |
1524 | trans->transid); | |
1525 | uuid_le_gen(&new_uuid); | |
1526 | memcpy(new_root_item->uuid, new_uuid.b, BTRFS_UUID_SIZE); | |
1527 | memcpy(new_root_item->parent_uuid, root->root_item.uuid, | |
1528 | BTRFS_UUID_SIZE); | |
70023da2 SB |
1529 | if (!(root_flags & BTRFS_ROOT_SUBVOL_RDONLY)) { |
1530 | memset(new_root_item->received_uuid, 0, | |
1531 | sizeof(new_root_item->received_uuid)); | |
1532 | memset(&new_root_item->stime, 0, sizeof(new_root_item->stime)); | |
1533 | memset(&new_root_item->rtime, 0, sizeof(new_root_item->rtime)); | |
1534 | btrfs_set_root_stransid(new_root_item, 0); | |
1535 | btrfs_set_root_rtransid(new_root_item, 0); | |
1536 | } | |
3cae210f QW |
1537 | btrfs_set_stack_timespec_sec(&new_root_item->otime, cur_time.tv_sec); |
1538 | btrfs_set_stack_timespec_nsec(&new_root_item->otime, cur_time.tv_nsec); | |
8ea05e3a | 1539 | btrfs_set_root_otransid(new_root_item, trans->transid); |
8ea05e3a | 1540 | |
6bdb72de | 1541 | old = btrfs_lock_root_node(root); |
49b25e05 | 1542 | ret = btrfs_cow_block(trans, root, old, NULL, 0, &old); |
79787eaa JM |
1543 | if (ret) { |
1544 | btrfs_tree_unlock(old); | |
1545 | free_extent_buffer(old); | |
8732d44f MX |
1546 | btrfs_abort_transaction(trans, root, ret); |
1547 | goto fail; | |
79787eaa | 1548 | } |
49b25e05 | 1549 | |
6bdb72de SW |
1550 | btrfs_set_lock_blocking(old); |
1551 | ||
49b25e05 | 1552 | ret = btrfs_copy_root(trans, root, old, &tmp, objectid); |
79787eaa | 1553 | /* clean up in any case */ |
6bdb72de SW |
1554 | btrfs_tree_unlock(old); |
1555 | free_extent_buffer(old); | |
8732d44f MX |
1556 | if (ret) { |
1557 | btrfs_abort_transaction(trans, root, ret); | |
1558 | goto fail; | |
1559 | } | |
f1ebcc74 | 1560 | /* see comments in should_cow_block() */ |
27cdeb70 | 1561 | set_bit(BTRFS_ROOT_FORCE_COW, &root->state); |
f1ebcc74 LB |
1562 | smp_wmb(); |
1563 | ||
6bdb72de | 1564 | btrfs_set_root_node(new_root_item, tmp); |
a22285a6 YZ |
1565 | /* record when the snapshot was created in key.offset */ |
1566 | key.offset = trans->transid; | |
1567 | ret = btrfs_insert_root(trans, tree_root, &key, new_root_item); | |
6bdb72de SW |
1568 | btrfs_tree_unlock(tmp); |
1569 | free_extent_buffer(tmp); | |
8732d44f MX |
1570 | if (ret) { |
1571 | btrfs_abort_transaction(trans, root, ret); | |
1572 | goto fail; | |
1573 | } | |
6bdb72de | 1574 | |
a22285a6 YZ |
1575 | /* |
1576 | * insert root back/forward references | |
1577 | */ | |
1578 | ret = btrfs_add_root_ref(trans, tree_root, objectid, | |
0660b5af | 1579 | parent_root->root_key.objectid, |
33345d01 | 1580 | btrfs_ino(parent_inode), index, |
a22285a6 | 1581 | dentry->d_name.name, dentry->d_name.len); |
8732d44f MX |
1582 | if (ret) { |
1583 | btrfs_abort_transaction(trans, root, ret); | |
1584 | goto fail; | |
1585 | } | |
0660b5af | 1586 | |
a22285a6 YZ |
1587 | key.offset = (u64)-1; |
1588 | pending->snap = btrfs_read_fs_root_no_name(root->fs_info, &key); | |
79787eaa JM |
1589 | if (IS_ERR(pending->snap)) { |
1590 | ret = PTR_ERR(pending->snap); | |
8732d44f MX |
1591 | btrfs_abort_transaction(trans, root, ret); |
1592 | goto fail; | |
79787eaa | 1593 | } |
d68fc57b | 1594 | |
49b25e05 | 1595 | ret = btrfs_reloc_post_snapshot(trans, pending); |
8732d44f MX |
1596 | if (ret) { |
1597 | btrfs_abort_transaction(trans, root, ret); | |
1598 | goto fail; | |
1599 | } | |
361048f5 MX |
1600 | |
1601 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); | |
8732d44f MX |
1602 | if (ret) { |
1603 | btrfs_abort_transaction(trans, root, ret); | |
1604 | goto fail; | |
1605 | } | |
42874b3d | 1606 | |
6426c7ad QW |
1607 | /* |
1608 | * Do special qgroup accounting for snapshot, as we do some qgroup | |
1609 | * snapshot hack to do fast snapshot. | |
1610 | * To co-operate with that hack, we do hack again. | |
1611 | * Or snapshot will be greatly slowed down by a subtree qgroup rescan | |
1612 | */ | |
1613 | ret = qgroup_account_snapshot(trans, root, parent_root, | |
1614 | pending->inherit, objectid); | |
1615 | if (ret < 0) | |
1616 | goto fail; | |
1617 | ||
42874b3d MX |
1618 | ret = btrfs_insert_dir_item(trans, parent_root, |
1619 | dentry->d_name.name, dentry->d_name.len, | |
1620 | parent_inode, &key, | |
1621 | BTRFS_FT_DIR, index); | |
1622 | /* We have check then name at the beginning, so it is impossible. */ | |
9c52057c | 1623 | BUG_ON(ret == -EEXIST || ret == -EOVERFLOW); |
8732d44f MX |
1624 | if (ret) { |
1625 | btrfs_abort_transaction(trans, root, ret); | |
1626 | goto fail; | |
1627 | } | |
42874b3d MX |
1628 | |
1629 | btrfs_i_size_write(parent_inode, parent_inode->i_size + | |
1630 | dentry->d_name.len * 2); | |
04b285f3 DD |
1631 | parent_inode->i_mtime = parent_inode->i_ctime = |
1632 | current_fs_time(parent_inode->i_sb); | |
be6aef60 | 1633 | ret = btrfs_update_inode_fallback(trans, parent_root, parent_inode); |
dd5f9615 SB |
1634 | if (ret) { |
1635 | btrfs_abort_transaction(trans, root, ret); | |
1636 | goto fail; | |
1637 | } | |
1638 | ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root, new_uuid.b, | |
1639 | BTRFS_UUID_KEY_SUBVOL, objectid); | |
1640 | if (ret) { | |
8732d44f | 1641 | btrfs_abort_transaction(trans, root, ret); |
dd5f9615 SB |
1642 | goto fail; |
1643 | } | |
1644 | if (!btrfs_is_empty_uuid(new_root_item->received_uuid)) { | |
1645 | ret = btrfs_uuid_tree_add(trans, fs_info->uuid_root, | |
1646 | new_root_item->received_uuid, | |
1647 | BTRFS_UUID_KEY_RECEIVED_SUBVOL, | |
1648 | objectid); | |
1649 | if (ret && ret != -EEXIST) { | |
1650 | btrfs_abort_transaction(trans, root, ret); | |
1651 | goto fail; | |
1652 | } | |
1653 | } | |
d6726335 QW |
1654 | |
1655 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); | |
1656 | if (ret) { | |
1657 | btrfs_abort_transaction(trans, root, ret); | |
1658 | goto fail; | |
1659 | } | |
1660 | ||
3063d29f | 1661 | fail: |
aec8030a MX |
1662 | pending->error = ret; |
1663 | dir_item_existed: | |
98c9942a | 1664 | trans->block_rsv = rsv; |
2382c5cc | 1665 | trans->bytes_reserved = 0; |
d6726335 QW |
1666 | clear_skip_qgroup: |
1667 | btrfs_clear_skip_qgroup(trans); | |
6fa9700e MX |
1668 | no_free_objectid: |
1669 | kfree(new_root_item); | |
b0c0ea63 | 1670 | pending->root_item = NULL; |
42874b3d | 1671 | btrfs_free_path(path); |
8546b570 DS |
1672 | pending->path = NULL; |
1673 | ||
49b25e05 | 1674 | return ret; |
3063d29f CM |
1675 | } |
1676 | ||
d352ac68 CM |
1677 | /* |
1678 | * create all the snapshots we've scheduled for creation | |
1679 | */ | |
80b6794d CM |
1680 | static noinline int create_pending_snapshots(struct btrfs_trans_handle *trans, |
1681 | struct btrfs_fs_info *fs_info) | |
3de4586c | 1682 | { |
aec8030a | 1683 | struct btrfs_pending_snapshot *pending, *next; |
3de4586c | 1684 | struct list_head *head = &trans->transaction->pending_snapshots; |
aec8030a | 1685 | int ret = 0; |
3de4586c | 1686 | |
aec8030a MX |
1687 | list_for_each_entry_safe(pending, next, head, list) { |
1688 | list_del(&pending->list); | |
1689 | ret = create_pending_snapshot(trans, fs_info, pending); | |
1690 | if (ret) | |
1691 | break; | |
1692 | } | |
1693 | return ret; | |
3de4586c CM |
1694 | } |
1695 | ||
5d4f98a2 YZ |
1696 | static void update_super_roots(struct btrfs_root *root) |
1697 | { | |
1698 | struct btrfs_root_item *root_item; | |
1699 | struct btrfs_super_block *super; | |
1700 | ||
6c41761f | 1701 | super = root->fs_info->super_copy; |
5d4f98a2 YZ |
1702 | |
1703 | root_item = &root->fs_info->chunk_root->root_item; | |
1704 | super->chunk_root = root_item->bytenr; | |
1705 | super->chunk_root_generation = root_item->generation; | |
1706 | super->chunk_root_level = root_item->level; | |
1707 | ||
1708 | root_item = &root->fs_info->tree_root->root_item; | |
1709 | super->root = root_item->bytenr; | |
1710 | super->generation = root_item->generation; | |
1711 | super->root_level = root_item->level; | |
73bc1876 | 1712 | if (btrfs_test_opt(root, SPACE_CACHE)) |
0af3d00b | 1713 | super->cache_generation = root_item->generation; |
70f80175 SB |
1714 | if (root->fs_info->update_uuid_tree_gen) |
1715 | super->uuid_tree_generation = root_item->generation; | |
5d4f98a2 YZ |
1716 | } |
1717 | ||
f36f3042 CM |
1718 | int btrfs_transaction_in_commit(struct btrfs_fs_info *info) |
1719 | { | |
4a9d8bde | 1720 | struct btrfs_transaction *trans; |
f36f3042 | 1721 | int ret = 0; |
4a9d8bde | 1722 | |
a4abeea4 | 1723 | spin_lock(&info->trans_lock); |
4a9d8bde MX |
1724 | trans = info->running_transaction; |
1725 | if (trans) | |
1726 | ret = (trans->state >= TRANS_STATE_COMMIT_START); | |
a4abeea4 | 1727 | spin_unlock(&info->trans_lock); |
f36f3042 CM |
1728 | return ret; |
1729 | } | |
1730 | ||
8929ecfa YZ |
1731 | int btrfs_transaction_blocked(struct btrfs_fs_info *info) |
1732 | { | |
4a9d8bde | 1733 | struct btrfs_transaction *trans; |
8929ecfa | 1734 | int ret = 0; |
4a9d8bde | 1735 | |
a4abeea4 | 1736 | spin_lock(&info->trans_lock); |
4a9d8bde MX |
1737 | trans = info->running_transaction; |
1738 | if (trans) | |
1739 | ret = is_transaction_blocked(trans); | |
a4abeea4 | 1740 | spin_unlock(&info->trans_lock); |
8929ecfa YZ |
1741 | return ret; |
1742 | } | |
1743 | ||
bb9c12c9 SW |
1744 | /* |
1745 | * wait for the current transaction commit to start and block subsequent | |
1746 | * transaction joins | |
1747 | */ | |
1748 | static void wait_current_trans_commit_start(struct btrfs_root *root, | |
1749 | struct btrfs_transaction *trans) | |
1750 | { | |
4a9d8bde | 1751 | wait_event(root->fs_info->transaction_blocked_wait, |
501407aa JB |
1752 | trans->state >= TRANS_STATE_COMMIT_START || |
1753 | trans->aborted); | |
bb9c12c9 SW |
1754 | } |
1755 | ||
1756 | /* | |
1757 | * wait for the current transaction to start and then become unblocked. | |
1758 | * caller holds ref. | |
1759 | */ | |
1760 | static void wait_current_trans_commit_start_and_unblock(struct btrfs_root *root, | |
1761 | struct btrfs_transaction *trans) | |
1762 | { | |
72d63ed6 | 1763 | wait_event(root->fs_info->transaction_wait, |
501407aa JB |
1764 | trans->state >= TRANS_STATE_UNBLOCKED || |
1765 | trans->aborted); | |
bb9c12c9 SW |
1766 | } |
1767 | ||
1768 | /* | |
1769 | * commit transactions asynchronously. once btrfs_commit_transaction_async | |
1770 | * returns, any subsequent transaction will not be allowed to join. | |
1771 | */ | |
1772 | struct btrfs_async_commit { | |
1773 | struct btrfs_trans_handle *newtrans; | |
1774 | struct btrfs_root *root; | |
7892b5af | 1775 | struct work_struct work; |
bb9c12c9 SW |
1776 | }; |
1777 | ||
1778 | static void do_async_commit(struct work_struct *work) | |
1779 | { | |
1780 | struct btrfs_async_commit *ac = | |
7892b5af | 1781 | container_of(work, struct btrfs_async_commit, work); |
bb9c12c9 | 1782 | |
6fc4e354 SW |
1783 | /* |
1784 | * We've got freeze protection passed with the transaction. | |
1785 | * Tell lockdep about it. | |
1786 | */ | |
b1a06a4b | 1787 | if (ac->newtrans->type & __TRANS_FREEZABLE) |
bee9182d | 1788 | __sb_writers_acquired(ac->root->fs_info->sb, SB_FREEZE_FS); |
6fc4e354 | 1789 | |
e209db7a SW |
1790 | current->journal_info = ac->newtrans; |
1791 | ||
bb9c12c9 SW |
1792 | btrfs_commit_transaction(ac->newtrans, ac->root); |
1793 | kfree(ac); | |
1794 | } | |
1795 | ||
1796 | int btrfs_commit_transaction_async(struct btrfs_trans_handle *trans, | |
1797 | struct btrfs_root *root, | |
1798 | int wait_for_unblock) | |
1799 | { | |
1800 | struct btrfs_async_commit *ac; | |
1801 | struct btrfs_transaction *cur_trans; | |
1802 | ||
1803 | ac = kmalloc(sizeof(*ac), GFP_NOFS); | |
db5b493a TI |
1804 | if (!ac) |
1805 | return -ENOMEM; | |
bb9c12c9 | 1806 | |
7892b5af | 1807 | INIT_WORK(&ac->work, do_async_commit); |
bb9c12c9 | 1808 | ac->root = root; |
7a7eaa40 | 1809 | ac->newtrans = btrfs_join_transaction(root); |
3612b495 TI |
1810 | if (IS_ERR(ac->newtrans)) { |
1811 | int err = PTR_ERR(ac->newtrans); | |
1812 | kfree(ac); | |
1813 | return err; | |
1814 | } | |
bb9c12c9 SW |
1815 | |
1816 | /* take transaction reference */ | |
bb9c12c9 | 1817 | cur_trans = trans->transaction; |
13c5a93e | 1818 | atomic_inc(&cur_trans->use_count); |
bb9c12c9 SW |
1819 | |
1820 | btrfs_end_transaction(trans, root); | |
6fc4e354 SW |
1821 | |
1822 | /* | |
1823 | * Tell lockdep we've released the freeze rwsem, since the | |
1824 | * async commit thread will be the one to unlock it. | |
1825 | */ | |
b1a06a4b | 1826 | if (ac->newtrans->type & __TRANS_FREEZABLE) |
bee9182d | 1827 | __sb_writers_release(root->fs_info->sb, SB_FREEZE_FS); |
6fc4e354 | 1828 | |
7892b5af | 1829 | schedule_work(&ac->work); |
bb9c12c9 SW |
1830 | |
1831 | /* wait for transaction to start and unblock */ | |
bb9c12c9 SW |
1832 | if (wait_for_unblock) |
1833 | wait_current_trans_commit_start_and_unblock(root, cur_trans); | |
1834 | else | |
1835 | wait_current_trans_commit_start(root, cur_trans); | |
bb9c12c9 | 1836 | |
38e88054 SW |
1837 | if (current->journal_info == trans) |
1838 | current->journal_info = NULL; | |
1839 | ||
724e2315 | 1840 | btrfs_put_transaction(cur_trans); |
bb9c12c9 SW |
1841 | return 0; |
1842 | } | |
1843 | ||
49b25e05 JM |
1844 | |
1845 | static void cleanup_transaction(struct btrfs_trans_handle *trans, | |
7b8b92af | 1846 | struct btrfs_root *root, int err) |
49b25e05 JM |
1847 | { |
1848 | struct btrfs_transaction *cur_trans = trans->transaction; | |
f094ac32 | 1849 | DEFINE_WAIT(wait); |
49b25e05 JM |
1850 | |
1851 | WARN_ON(trans->use_count > 1); | |
1852 | ||
7b8b92af JB |
1853 | btrfs_abort_transaction(trans, root, err); |
1854 | ||
49b25e05 | 1855 | spin_lock(&root->fs_info->trans_lock); |
66b6135b | 1856 | |
25d8c284 MX |
1857 | /* |
1858 | * If the transaction is removed from the list, it means this | |
1859 | * transaction has been committed successfully, so it is impossible | |
1860 | * to call the cleanup function. | |
1861 | */ | |
1862 | BUG_ON(list_empty(&cur_trans->list)); | |
66b6135b | 1863 | |
49b25e05 | 1864 | list_del_init(&cur_trans->list); |
d7096fc3 | 1865 | if (cur_trans == root->fs_info->running_transaction) { |
4a9d8bde | 1866 | cur_trans->state = TRANS_STATE_COMMIT_DOING; |
f094ac32 LB |
1867 | spin_unlock(&root->fs_info->trans_lock); |
1868 | wait_event(cur_trans->writer_wait, | |
1869 | atomic_read(&cur_trans->num_writers) == 1); | |
1870 | ||
1871 | spin_lock(&root->fs_info->trans_lock); | |
d7096fc3 | 1872 | } |
49b25e05 JM |
1873 | spin_unlock(&root->fs_info->trans_lock); |
1874 | ||
1875 | btrfs_cleanup_one_transaction(trans->transaction, root); | |
1876 | ||
4a9d8bde MX |
1877 | spin_lock(&root->fs_info->trans_lock); |
1878 | if (cur_trans == root->fs_info->running_transaction) | |
1879 | root->fs_info->running_transaction = NULL; | |
1880 | spin_unlock(&root->fs_info->trans_lock); | |
1881 | ||
e0228285 JB |
1882 | if (trans->type & __TRANS_FREEZABLE) |
1883 | sb_end_intwrite(root->fs_info->sb); | |
724e2315 JB |
1884 | btrfs_put_transaction(cur_trans); |
1885 | btrfs_put_transaction(cur_trans); | |
49b25e05 JM |
1886 | |
1887 | trace_btrfs_transaction_commit(root); | |
1888 | ||
49b25e05 JM |
1889 | if (current->journal_info == trans) |
1890 | current->journal_info = NULL; | |
c0af8f0b | 1891 | btrfs_scrub_cancel(root->fs_info); |
49b25e05 JM |
1892 | |
1893 | kmem_cache_free(btrfs_trans_handle_cachep, trans); | |
1894 | } | |
1895 | ||
82436617 MX |
1896 | static inline int btrfs_start_delalloc_flush(struct btrfs_fs_info *fs_info) |
1897 | { | |
1898 | if (btrfs_test_opt(fs_info->tree_root, FLUSHONCOMMIT)) | |
6c255e67 | 1899 | return btrfs_start_delalloc_roots(fs_info, 1, -1); |
82436617 MX |
1900 | return 0; |
1901 | } | |
1902 | ||
1903 | static inline void btrfs_wait_delalloc_flush(struct btrfs_fs_info *fs_info) | |
1904 | { | |
1905 | if (btrfs_test_opt(fs_info->tree_root, FLUSHONCOMMIT)) | |
578def7c | 1906 | btrfs_wait_ordered_roots(fs_info, -1, 0, (u64)-1); |
82436617 MX |
1907 | } |
1908 | ||
50d9aa99 | 1909 | static inline void |
161c3549 | 1910 | btrfs_wait_pending_ordered(struct btrfs_transaction *cur_trans) |
50d9aa99 | 1911 | { |
161c3549 JB |
1912 | wait_event(cur_trans->pending_wait, |
1913 | atomic_read(&cur_trans->pending_ordered) == 0); | |
50d9aa99 JB |
1914 | } |
1915 | ||
79154b1b CM |
1916 | int btrfs_commit_transaction(struct btrfs_trans_handle *trans, |
1917 | struct btrfs_root *root) | |
1918 | { | |
49b25e05 | 1919 | struct btrfs_transaction *cur_trans = trans->transaction; |
8fd17795 | 1920 | struct btrfs_transaction *prev_trans = NULL; |
656f30db | 1921 | struct btrfs_inode *btree_ino = BTRFS_I(root->fs_info->btree_inode); |
25287e0a | 1922 | int ret; |
79154b1b | 1923 | |
8d25a086 MX |
1924 | /* Stop the commit early if ->aborted is set */ |
1925 | if (unlikely(ACCESS_ONCE(cur_trans->aborted))) { | |
25287e0a | 1926 | ret = cur_trans->aborted; |
e4a2bcac JB |
1927 | btrfs_end_transaction(trans, root); |
1928 | return ret; | |
25287e0a | 1929 | } |
49b25e05 | 1930 | |
56bec294 CM |
1931 | /* make a pass through all the delayed refs we have so far |
1932 | * any runnings procs may add more while we are here | |
1933 | */ | |
1934 | ret = btrfs_run_delayed_refs(trans, root, 0); | |
e4a2bcac JB |
1935 | if (ret) { |
1936 | btrfs_end_transaction(trans, root); | |
1937 | return ret; | |
1938 | } | |
56bec294 | 1939 | |
0e721106 JB |
1940 | btrfs_trans_release_metadata(trans, root); |
1941 | trans->block_rsv = NULL; | |
1942 | ||
b7ec40d7 | 1943 | cur_trans = trans->transaction; |
49b25e05 | 1944 | |
56bec294 CM |
1945 | /* |
1946 | * set the flushing flag so procs in this transaction have to | |
1947 | * start sending their work down. | |
1948 | */ | |
b7ec40d7 | 1949 | cur_trans->delayed_refs.flushing = 1; |
1be41b78 | 1950 | smp_wmb(); |
56bec294 | 1951 | |
ea658bad JB |
1952 | if (!list_empty(&trans->new_bgs)) |
1953 | btrfs_create_pending_block_groups(trans, root); | |
1954 | ||
c3e69d58 | 1955 | ret = btrfs_run_delayed_refs(trans, root, 0); |
e4a2bcac JB |
1956 | if (ret) { |
1957 | btrfs_end_transaction(trans, root); | |
1958 | return ret; | |
1959 | } | |
56bec294 | 1960 | |
3204d33c | 1961 | if (!test_bit(BTRFS_TRANS_DIRTY_BG_RUN, &cur_trans->flags)) { |
1bbc621e CM |
1962 | int run_it = 0; |
1963 | ||
1964 | /* this mutex is also taken before trying to set | |
1965 | * block groups readonly. We need to make sure | |
1966 | * that nobody has set a block group readonly | |
1967 | * after a extents from that block group have been | |
1968 | * allocated for cache files. btrfs_set_block_group_ro | |
1969 | * will wait for the transaction to commit if it | |
3204d33c | 1970 | * finds BTRFS_TRANS_DIRTY_BG_RUN set. |
1bbc621e | 1971 | * |
3204d33c JB |
1972 | * The BTRFS_TRANS_DIRTY_BG_RUN flag is also used to make sure |
1973 | * only one process starts all the block group IO. It wouldn't | |
1bbc621e CM |
1974 | * hurt to have more than one go through, but there's no |
1975 | * real advantage to it either. | |
1976 | */ | |
1977 | mutex_lock(&root->fs_info->ro_block_group_mutex); | |
3204d33c JB |
1978 | if (!test_and_set_bit(BTRFS_TRANS_DIRTY_BG_RUN, |
1979 | &cur_trans->flags)) | |
1bbc621e | 1980 | run_it = 1; |
1bbc621e CM |
1981 | mutex_unlock(&root->fs_info->ro_block_group_mutex); |
1982 | ||
1983 | if (run_it) | |
1984 | ret = btrfs_start_dirty_block_groups(trans, root); | |
1985 | } | |
1986 | if (ret) { | |
1987 | btrfs_end_transaction(trans, root); | |
1988 | return ret; | |
1989 | } | |
1990 | ||
4a9d8bde MX |
1991 | spin_lock(&root->fs_info->trans_lock); |
1992 | if (cur_trans->state >= TRANS_STATE_COMMIT_START) { | |
1993 | spin_unlock(&root->fs_info->trans_lock); | |
13c5a93e | 1994 | atomic_inc(&cur_trans->use_count); |
49b25e05 | 1995 | ret = btrfs_end_transaction(trans, root); |
ccd467d6 | 1996 | |
b9c8300c | 1997 | wait_for_commit(root, cur_trans); |
15ee9bc7 | 1998 | |
b4924a0f LB |
1999 | if (unlikely(cur_trans->aborted)) |
2000 | ret = cur_trans->aborted; | |
2001 | ||
724e2315 | 2002 | btrfs_put_transaction(cur_trans); |
15ee9bc7 | 2003 | |
49b25e05 | 2004 | return ret; |
79154b1b | 2005 | } |
4313b399 | 2006 | |
4a9d8bde | 2007 | cur_trans->state = TRANS_STATE_COMMIT_START; |
bb9c12c9 SW |
2008 | wake_up(&root->fs_info->transaction_blocked_wait); |
2009 | ||
ccd467d6 CM |
2010 | if (cur_trans->list.prev != &root->fs_info->trans_list) { |
2011 | prev_trans = list_entry(cur_trans->list.prev, | |
2012 | struct btrfs_transaction, list); | |
4a9d8bde | 2013 | if (prev_trans->state != TRANS_STATE_COMPLETED) { |
13c5a93e | 2014 | atomic_inc(&prev_trans->use_count); |
a4abeea4 | 2015 | spin_unlock(&root->fs_info->trans_lock); |
ccd467d6 CM |
2016 | |
2017 | wait_for_commit(root, prev_trans); | |
1f9b8c8f | 2018 | ret = prev_trans->aborted; |
ccd467d6 | 2019 | |
724e2315 | 2020 | btrfs_put_transaction(prev_trans); |
1f9b8c8f FM |
2021 | if (ret) |
2022 | goto cleanup_transaction; | |
a4abeea4 JB |
2023 | } else { |
2024 | spin_unlock(&root->fs_info->trans_lock); | |
ccd467d6 | 2025 | } |
a4abeea4 JB |
2026 | } else { |
2027 | spin_unlock(&root->fs_info->trans_lock); | |
ccd467d6 | 2028 | } |
15ee9bc7 | 2029 | |
0860adfd MX |
2030 | extwriter_counter_dec(cur_trans, trans->type); |
2031 | ||
82436617 MX |
2032 | ret = btrfs_start_delalloc_flush(root->fs_info); |
2033 | if (ret) | |
2034 | goto cleanup_transaction; | |
2035 | ||
8d875f95 | 2036 | ret = btrfs_run_delayed_items(trans, root); |
581227d0 MX |
2037 | if (ret) |
2038 | goto cleanup_transaction; | |
15ee9bc7 | 2039 | |
581227d0 MX |
2040 | wait_event(cur_trans->writer_wait, |
2041 | extwriter_counter_read(cur_trans) == 0); | |
15ee9bc7 | 2042 | |
581227d0 | 2043 | /* some pending stuffs might be added after the previous flush. */ |
8d875f95 | 2044 | ret = btrfs_run_delayed_items(trans, root); |
ca469637 MX |
2045 | if (ret) |
2046 | goto cleanup_transaction; | |
2047 | ||
82436617 | 2048 | btrfs_wait_delalloc_flush(root->fs_info); |
cb7ab021 | 2049 | |
161c3549 | 2050 | btrfs_wait_pending_ordered(cur_trans); |
50d9aa99 | 2051 | |
cb7ab021 | 2052 | btrfs_scrub_pause(root); |
ed0ca140 JB |
2053 | /* |
2054 | * Ok now we need to make sure to block out any other joins while we | |
2055 | * commit the transaction. We could have started a join before setting | |
4a9d8bde | 2056 | * COMMIT_DOING so make sure to wait for num_writers to == 1 again. |
ed0ca140 JB |
2057 | */ |
2058 | spin_lock(&root->fs_info->trans_lock); | |
4a9d8bde | 2059 | cur_trans->state = TRANS_STATE_COMMIT_DOING; |
ed0ca140 JB |
2060 | spin_unlock(&root->fs_info->trans_lock); |
2061 | wait_event(cur_trans->writer_wait, | |
2062 | atomic_read(&cur_trans->num_writers) == 1); | |
2063 | ||
2cba30f1 MX |
2064 | /* ->aborted might be set after the previous check, so check it */ |
2065 | if (unlikely(ACCESS_ONCE(cur_trans->aborted))) { | |
2066 | ret = cur_trans->aborted; | |
6cf7f77e | 2067 | goto scrub_continue; |
2cba30f1 | 2068 | } |
7585717f CM |
2069 | /* |
2070 | * the reloc mutex makes sure that we stop | |
2071 | * the balancing code from coming in and moving | |
2072 | * extents around in the middle of the commit | |
2073 | */ | |
2074 | mutex_lock(&root->fs_info->reloc_mutex); | |
2075 | ||
42874b3d MX |
2076 | /* |
2077 | * We needn't worry about the delayed items because we will | |
2078 | * deal with them in create_pending_snapshot(), which is the | |
2079 | * core function of the snapshot creation. | |
2080 | */ | |
2081 | ret = create_pending_snapshots(trans, root->fs_info); | |
49b25e05 JM |
2082 | if (ret) { |
2083 | mutex_unlock(&root->fs_info->reloc_mutex); | |
6cf7f77e | 2084 | goto scrub_continue; |
49b25e05 | 2085 | } |
3063d29f | 2086 | |
42874b3d MX |
2087 | /* |
2088 | * We insert the dir indexes of the snapshots and update the inode | |
2089 | * of the snapshots' parents after the snapshot creation, so there | |
2090 | * are some delayed items which are not dealt with. Now deal with | |
2091 | * them. | |
2092 | * | |
2093 | * We needn't worry that this operation will corrupt the snapshots, | |
2094 | * because all the tree which are snapshoted will be forced to COW | |
2095 | * the nodes and leaves. | |
2096 | */ | |
2097 | ret = btrfs_run_delayed_items(trans, root); | |
49b25e05 JM |
2098 | if (ret) { |
2099 | mutex_unlock(&root->fs_info->reloc_mutex); | |
6cf7f77e | 2100 | goto scrub_continue; |
49b25e05 | 2101 | } |
16cdcec7 | 2102 | |
56bec294 | 2103 | ret = btrfs_run_delayed_refs(trans, root, (unsigned long)-1); |
49b25e05 JM |
2104 | if (ret) { |
2105 | mutex_unlock(&root->fs_info->reloc_mutex); | |
6cf7f77e | 2106 | goto scrub_continue; |
49b25e05 | 2107 | } |
56bec294 | 2108 | |
0ed4792a QW |
2109 | /* Reocrd old roots for later qgroup accounting */ |
2110 | ret = btrfs_qgroup_prepare_account_extents(trans, root->fs_info); | |
2111 | if (ret) { | |
2112 | mutex_unlock(&root->fs_info->reloc_mutex); | |
2113 | goto scrub_continue; | |
2114 | } | |
2115 | ||
e999376f CM |
2116 | /* |
2117 | * make sure none of the code above managed to slip in a | |
2118 | * delayed item | |
2119 | */ | |
2120 | btrfs_assert_delayed_root_empty(root); | |
2121 | ||
2c90e5d6 | 2122 | WARN_ON(cur_trans != trans->transaction); |
dc17ff8f | 2123 | |
e02119d5 CM |
2124 | /* btrfs_commit_tree_roots is responsible for getting the |
2125 | * various roots consistent with each other. Every pointer | |
2126 | * in the tree of tree roots has to point to the most up to date | |
2127 | * root for every subvolume and other tree. So, we have to keep | |
2128 | * the tree logging code from jumping in and changing any | |
2129 | * of the trees. | |
2130 | * | |
2131 | * At this point in the commit, there can't be any tree-log | |
2132 | * writers, but a little lower down we drop the trans mutex | |
2133 | * and let new people in. By holding the tree_log_mutex | |
2134 | * from now until after the super is written, we avoid races | |
2135 | * with the tree-log code. | |
2136 | */ | |
2137 | mutex_lock(&root->fs_info->tree_log_mutex); | |
2138 | ||
5d4f98a2 | 2139 | ret = commit_fs_roots(trans, root); |
49b25e05 JM |
2140 | if (ret) { |
2141 | mutex_unlock(&root->fs_info->tree_log_mutex); | |
871383be | 2142 | mutex_unlock(&root->fs_info->reloc_mutex); |
6cf7f77e | 2143 | goto scrub_continue; |
49b25e05 | 2144 | } |
54aa1f4d | 2145 | |
3818aea2 | 2146 | /* |
7e1876ac DS |
2147 | * Since the transaction is done, we can apply the pending changes |
2148 | * before the next transaction. | |
3818aea2 | 2149 | */ |
572d9ab7 | 2150 | btrfs_apply_pending_changes(root->fs_info); |
3818aea2 | 2151 | |
5d4f98a2 | 2152 | /* commit_fs_roots gets rid of all the tree log roots, it is now |
e02119d5 CM |
2153 | * safe to free the root of tree log roots |
2154 | */ | |
2155 | btrfs_free_log_root_tree(trans, root->fs_info); | |
2156 | ||
0ed4792a QW |
2157 | /* |
2158 | * Since fs roots are all committed, we can get a quite accurate | |
2159 | * new_roots. So let's do quota accounting. | |
2160 | */ | |
2161 | ret = btrfs_qgroup_account_extents(trans, root->fs_info); | |
2162 | if (ret < 0) { | |
2163 | mutex_unlock(&root->fs_info->tree_log_mutex); | |
2164 | mutex_unlock(&root->fs_info->reloc_mutex); | |
2165 | goto scrub_continue; | |
2166 | } | |
2167 | ||
5d4f98a2 | 2168 | ret = commit_cowonly_roots(trans, root); |
49b25e05 JM |
2169 | if (ret) { |
2170 | mutex_unlock(&root->fs_info->tree_log_mutex); | |
871383be | 2171 | mutex_unlock(&root->fs_info->reloc_mutex); |
6cf7f77e | 2172 | goto scrub_continue; |
49b25e05 | 2173 | } |
54aa1f4d | 2174 | |
2cba30f1 MX |
2175 | /* |
2176 | * The tasks which save the space cache and inode cache may also | |
2177 | * update ->aborted, check it. | |
2178 | */ | |
2179 | if (unlikely(ACCESS_ONCE(cur_trans->aborted))) { | |
2180 | ret = cur_trans->aborted; | |
2181 | mutex_unlock(&root->fs_info->tree_log_mutex); | |
2182 | mutex_unlock(&root->fs_info->reloc_mutex); | |
6cf7f77e | 2183 | goto scrub_continue; |
2cba30f1 MX |
2184 | } |
2185 | ||
11833d66 YZ |
2186 | btrfs_prepare_extent_commit(trans, root); |
2187 | ||
78fae27e | 2188 | cur_trans = root->fs_info->running_transaction; |
5d4f98a2 YZ |
2189 | |
2190 | btrfs_set_root_node(&root->fs_info->tree_root->root_item, | |
2191 | root->fs_info->tree_root->node); | |
9e351cc8 JB |
2192 | list_add_tail(&root->fs_info->tree_root->dirty_list, |
2193 | &cur_trans->switch_commits); | |
5d4f98a2 YZ |
2194 | |
2195 | btrfs_set_root_node(&root->fs_info->chunk_root->root_item, | |
2196 | root->fs_info->chunk_root->node); | |
9e351cc8 JB |
2197 | list_add_tail(&root->fs_info->chunk_root->dirty_list, |
2198 | &cur_trans->switch_commits); | |
2199 | ||
2200 | switch_commit_roots(cur_trans, root->fs_info); | |
5d4f98a2 | 2201 | |
edf39272 | 2202 | assert_qgroups_uptodate(trans); |
ce93ec54 | 2203 | ASSERT(list_empty(&cur_trans->dirty_bgs)); |
1bbc621e | 2204 | ASSERT(list_empty(&cur_trans->io_bgs)); |
5d4f98a2 | 2205 | update_super_roots(root); |
e02119d5 | 2206 | |
60e7cd3a JB |
2207 | btrfs_set_super_log_root(root->fs_info->super_copy, 0); |
2208 | btrfs_set_super_log_root_level(root->fs_info->super_copy, 0); | |
6c41761f DS |
2209 | memcpy(root->fs_info->super_for_commit, root->fs_info->super_copy, |
2210 | sizeof(*root->fs_info->super_copy)); | |
ccd467d6 | 2211 | |
935e5cc9 | 2212 | btrfs_update_commit_device_size(root->fs_info); |
ce7213c7 | 2213 | btrfs_update_commit_device_bytes_used(root, cur_trans); |
935e5cc9 | 2214 | |
656f30db FM |
2215 | clear_bit(BTRFS_INODE_BTREE_LOG1_ERR, &btree_ino->runtime_flags); |
2216 | clear_bit(BTRFS_INODE_BTREE_LOG2_ERR, &btree_ino->runtime_flags); | |
2217 | ||
4fbcdf66 FM |
2218 | btrfs_trans_release_chunk_metadata(trans); |
2219 | ||
a4abeea4 | 2220 | spin_lock(&root->fs_info->trans_lock); |
4a9d8bde | 2221 | cur_trans->state = TRANS_STATE_UNBLOCKED; |
a4abeea4 | 2222 | root->fs_info->running_transaction = NULL; |
a4abeea4 | 2223 | spin_unlock(&root->fs_info->trans_lock); |
7585717f | 2224 | mutex_unlock(&root->fs_info->reloc_mutex); |
b7ec40d7 | 2225 | |
f9295749 | 2226 | wake_up(&root->fs_info->transaction_wait); |
e6dcd2dc | 2227 | |
79154b1b | 2228 | ret = btrfs_write_and_wait_transaction(trans, root); |
49b25e05 | 2229 | if (ret) { |
34d97007 | 2230 | btrfs_handle_fs_error(root->fs_info, ret, |
08748810 | 2231 | "Error while writing out transaction"); |
49b25e05 | 2232 | mutex_unlock(&root->fs_info->tree_log_mutex); |
6cf7f77e | 2233 | goto scrub_continue; |
49b25e05 JM |
2234 | } |
2235 | ||
2236 | ret = write_ctree_super(trans, root, 0); | |
2237 | if (ret) { | |
2238 | mutex_unlock(&root->fs_info->tree_log_mutex); | |
6cf7f77e | 2239 | goto scrub_continue; |
49b25e05 | 2240 | } |
4313b399 | 2241 | |
e02119d5 CM |
2242 | /* |
2243 | * the super is written, we can safely allow the tree-loggers | |
2244 | * to go about their business | |
2245 | */ | |
2246 | mutex_unlock(&root->fs_info->tree_log_mutex); | |
2247 | ||
11833d66 | 2248 | btrfs_finish_extent_commit(trans, root); |
4313b399 | 2249 | |
3204d33c | 2250 | if (test_bit(BTRFS_TRANS_HAVE_FREE_BGS, &cur_trans->flags)) |
13212b54 ZL |
2251 | btrfs_clear_space_info_full(root->fs_info); |
2252 | ||
15ee9bc7 | 2253 | root->fs_info->last_trans_committed = cur_trans->transid; |
4a9d8bde MX |
2254 | /* |
2255 | * We needn't acquire the lock here because there is no other task | |
2256 | * which can change it. | |
2257 | */ | |
2258 | cur_trans->state = TRANS_STATE_COMPLETED; | |
2c90e5d6 | 2259 | wake_up(&cur_trans->commit_wait); |
3de4586c | 2260 | |
a4abeea4 | 2261 | spin_lock(&root->fs_info->trans_lock); |
13c5a93e | 2262 | list_del_init(&cur_trans->list); |
a4abeea4 JB |
2263 | spin_unlock(&root->fs_info->trans_lock); |
2264 | ||
724e2315 JB |
2265 | btrfs_put_transaction(cur_trans); |
2266 | btrfs_put_transaction(cur_trans); | |
58176a96 | 2267 | |
0860adfd | 2268 | if (trans->type & __TRANS_FREEZABLE) |
354aa0fb | 2269 | sb_end_intwrite(root->fs_info->sb); |
b2b5ef5c | 2270 | |
1abe9b8a | 2271 | trace_btrfs_transaction_commit(root); |
2272 | ||
a2de733c AJ |
2273 | btrfs_scrub_continue(root); |
2274 | ||
9ed74f2d JB |
2275 | if (current->journal_info == trans) |
2276 | current->journal_info = NULL; | |
2277 | ||
2c90e5d6 | 2278 | kmem_cache_free(btrfs_trans_handle_cachep, trans); |
24bbcf04 | 2279 | |
8a733013 ZL |
2280 | if (current != root->fs_info->transaction_kthread && |
2281 | current != root->fs_info->cleaner_kthread) | |
24bbcf04 YZ |
2282 | btrfs_run_delayed_iputs(root); |
2283 | ||
79154b1b | 2284 | return ret; |
49b25e05 | 2285 | |
6cf7f77e WS |
2286 | scrub_continue: |
2287 | btrfs_scrub_continue(root); | |
49b25e05 | 2288 | cleanup_transaction: |
0e721106 | 2289 | btrfs_trans_release_metadata(trans, root); |
4fbcdf66 | 2290 | btrfs_trans_release_chunk_metadata(trans); |
0e721106 | 2291 | trans->block_rsv = NULL; |
c2cf52eb | 2292 | btrfs_warn(root->fs_info, "Skipping commit of aborted transaction."); |
49b25e05 JM |
2293 | if (current->journal_info == trans) |
2294 | current->journal_info = NULL; | |
7b8b92af | 2295 | cleanup_transaction(trans, root, ret); |
49b25e05 JM |
2296 | |
2297 | return ret; | |
79154b1b CM |
2298 | } |
2299 | ||
d352ac68 | 2300 | /* |
9d1a2a3a DS |
2301 | * return < 0 if error |
2302 | * 0 if there are no more dead_roots at the time of call | |
2303 | * 1 there are more to be processed, call me again | |
2304 | * | |
2305 | * The return value indicates there are certainly more snapshots to delete, but | |
2306 | * if there comes a new one during processing, it may return 0. We don't mind, | |
2307 | * because btrfs_commit_super will poke cleaner thread and it will process it a | |
2308 | * few seconds later. | |
d352ac68 | 2309 | */ |
9d1a2a3a | 2310 | int btrfs_clean_one_deleted_snapshot(struct btrfs_root *root) |
e9d0b13b | 2311 | { |
9d1a2a3a | 2312 | int ret; |
5d4f98a2 YZ |
2313 | struct btrfs_fs_info *fs_info = root->fs_info; |
2314 | ||
a4abeea4 | 2315 | spin_lock(&fs_info->trans_lock); |
9d1a2a3a DS |
2316 | if (list_empty(&fs_info->dead_roots)) { |
2317 | spin_unlock(&fs_info->trans_lock); | |
2318 | return 0; | |
2319 | } | |
2320 | root = list_first_entry(&fs_info->dead_roots, | |
2321 | struct btrfs_root, root_list); | |
cfad392b | 2322 | list_del_init(&root->root_list); |
a4abeea4 | 2323 | spin_unlock(&fs_info->trans_lock); |
e9d0b13b | 2324 | |
efe120a0 | 2325 | pr_debug("BTRFS: cleaner removing %llu\n", root->objectid); |
76dda93c | 2326 | |
9d1a2a3a | 2327 | btrfs_kill_all_delayed_nodes(root); |
16cdcec7 | 2328 | |
9d1a2a3a DS |
2329 | if (btrfs_header_backref_rev(root->node) < |
2330 | BTRFS_MIXED_BACKREF_REV) | |
2331 | ret = btrfs_drop_snapshot(root, NULL, 0, 0); | |
2332 | else | |
2333 | ret = btrfs_drop_snapshot(root, NULL, 1, 0); | |
32471dc2 | 2334 | |
6596a928 | 2335 | return (ret < 0) ? 0 : 1; |
e9d0b13b | 2336 | } |
572d9ab7 DS |
2337 | |
2338 | void btrfs_apply_pending_changes(struct btrfs_fs_info *fs_info) | |
2339 | { | |
2340 | unsigned long prev; | |
2341 | unsigned long bit; | |
2342 | ||
6c9fe14f | 2343 | prev = xchg(&fs_info->pending_changes, 0); |
572d9ab7 DS |
2344 | if (!prev) |
2345 | return; | |
2346 | ||
7e1876ac DS |
2347 | bit = 1 << BTRFS_PENDING_SET_INODE_MAP_CACHE; |
2348 | if (prev & bit) | |
2349 | btrfs_set_opt(fs_info->mount_opt, INODE_MAP_CACHE); | |
2350 | prev &= ~bit; | |
2351 | ||
2352 | bit = 1 << BTRFS_PENDING_CLEAR_INODE_MAP_CACHE; | |
2353 | if (prev & bit) | |
2354 | btrfs_clear_opt(fs_info->mount_opt, INODE_MAP_CACHE); | |
2355 | prev &= ~bit; | |
2356 | ||
d51033d0 DS |
2357 | bit = 1 << BTRFS_PENDING_COMMIT; |
2358 | if (prev & bit) | |
2359 | btrfs_debug(fs_info, "pending commit done"); | |
2360 | prev &= ~bit; | |
2361 | ||
572d9ab7 DS |
2362 | if (prev) |
2363 | btrfs_warn(fs_info, | |
2364 | "unknown pending changes left 0x%lx, ignoring", prev); | |
2365 | } |