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e02119d5 CM |
1 | /* |
2 | * Copyright (C) 2008 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 | ||
19 | #include <linux/sched.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
c6adc9cc | 21 | #include <linux/blkdev.h> |
5dc562c5 | 22 | #include <linux/list_sort.h> |
995946dd | 23 | #include "tree-log.h" |
e02119d5 CM |
24 | #include "disk-io.h" |
25 | #include "locking.h" | |
26 | #include "print-tree.h" | |
f186373f | 27 | #include "backref.h" |
f186373f | 28 | #include "hash.h" |
e02119d5 CM |
29 | |
30 | /* magic values for the inode_only field in btrfs_log_inode: | |
31 | * | |
32 | * LOG_INODE_ALL means to log everything | |
33 | * LOG_INODE_EXISTS means to log just enough to recreate the inode | |
34 | * during log replay | |
35 | */ | |
36 | #define LOG_INODE_ALL 0 | |
37 | #define LOG_INODE_EXISTS 1 | |
38 | ||
12fcfd22 CM |
39 | /* |
40 | * directory trouble cases | |
41 | * | |
42 | * 1) on rename or unlink, if the inode being unlinked isn't in the fsync | |
43 | * log, we must force a full commit before doing an fsync of the directory | |
44 | * where the unlink was done. | |
45 | * ---> record transid of last unlink/rename per directory | |
46 | * | |
47 | * mkdir foo/some_dir | |
48 | * normal commit | |
49 | * rename foo/some_dir foo2/some_dir | |
50 | * mkdir foo/some_dir | |
51 | * fsync foo/some_dir/some_file | |
52 | * | |
53 | * The fsync above will unlink the original some_dir without recording | |
54 | * it in its new location (foo2). After a crash, some_dir will be gone | |
55 | * unless the fsync of some_file forces a full commit | |
56 | * | |
57 | * 2) we must log any new names for any file or dir that is in the fsync | |
58 | * log. ---> check inode while renaming/linking. | |
59 | * | |
60 | * 2a) we must log any new names for any file or dir during rename | |
61 | * when the directory they are being removed from was logged. | |
62 | * ---> check inode and old parent dir during rename | |
63 | * | |
64 | * 2a is actually the more important variant. With the extra logging | |
65 | * a crash might unlink the old name without recreating the new one | |
66 | * | |
67 | * 3) after a crash, we must go through any directories with a link count | |
68 | * of zero and redo the rm -rf | |
69 | * | |
70 | * mkdir f1/foo | |
71 | * normal commit | |
72 | * rm -rf f1/foo | |
73 | * fsync(f1) | |
74 | * | |
75 | * The directory f1 was fully removed from the FS, but fsync was never | |
76 | * called on f1, only its parent dir. After a crash the rm -rf must | |
77 | * be replayed. This must be able to recurse down the entire | |
78 | * directory tree. The inode link count fixup code takes care of the | |
79 | * ugly details. | |
80 | */ | |
81 | ||
e02119d5 CM |
82 | /* |
83 | * stages for the tree walking. The first | |
84 | * stage (0) is to only pin down the blocks we find | |
85 | * the second stage (1) is to make sure that all the inodes | |
86 | * we find in the log are created in the subvolume. | |
87 | * | |
88 | * The last stage is to deal with directories and links and extents | |
89 | * and all the other fun semantics | |
90 | */ | |
91 | #define LOG_WALK_PIN_ONLY 0 | |
92 | #define LOG_WALK_REPLAY_INODES 1 | |
dd8e7217 JB |
93 | #define LOG_WALK_REPLAY_DIR_INDEX 2 |
94 | #define LOG_WALK_REPLAY_ALL 3 | |
e02119d5 | 95 | |
12fcfd22 | 96 | static int btrfs_log_inode(struct btrfs_trans_handle *trans, |
49dae1bc FM |
97 | struct btrfs_root *root, struct inode *inode, |
98 | int inode_only, | |
99 | const loff_t start, | |
8407f553 FM |
100 | const loff_t end, |
101 | struct btrfs_log_ctx *ctx); | |
ec051c0f YZ |
102 | static int link_to_fixup_dir(struct btrfs_trans_handle *trans, |
103 | struct btrfs_root *root, | |
104 | struct btrfs_path *path, u64 objectid); | |
12fcfd22 CM |
105 | static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, |
106 | struct btrfs_root *root, | |
107 | struct btrfs_root *log, | |
108 | struct btrfs_path *path, | |
109 | u64 dirid, int del_all); | |
e02119d5 CM |
110 | |
111 | /* | |
112 | * tree logging is a special write ahead log used to make sure that | |
113 | * fsyncs and O_SYNCs can happen without doing full tree commits. | |
114 | * | |
115 | * Full tree commits are expensive because they require commonly | |
116 | * modified blocks to be recowed, creating many dirty pages in the | |
117 | * extent tree an 4x-6x higher write load than ext3. | |
118 | * | |
119 | * Instead of doing a tree commit on every fsync, we use the | |
120 | * key ranges and transaction ids to find items for a given file or directory | |
121 | * that have changed in this transaction. Those items are copied into | |
122 | * a special tree (one per subvolume root), that tree is written to disk | |
123 | * and then the fsync is considered complete. | |
124 | * | |
125 | * After a crash, items are copied out of the log-tree back into the | |
126 | * subvolume tree. Any file data extents found are recorded in the extent | |
127 | * allocation tree, and the log-tree freed. | |
128 | * | |
129 | * The log tree is read three times, once to pin down all the extents it is | |
130 | * using in ram and once, once to create all the inodes logged in the tree | |
131 | * and once to do all the other items. | |
132 | */ | |
133 | ||
e02119d5 CM |
134 | /* |
135 | * start a sub transaction and setup the log tree | |
136 | * this increments the log tree writer count to make the people | |
137 | * syncing the tree wait for us to finish | |
138 | */ | |
139 | static int start_log_trans(struct btrfs_trans_handle *trans, | |
8b050d35 MX |
140 | struct btrfs_root *root, |
141 | struct btrfs_log_ctx *ctx) | |
e02119d5 | 142 | { |
8b050d35 | 143 | int index; |
e02119d5 | 144 | int ret; |
7237f183 YZ |
145 | |
146 | mutex_lock(&root->log_mutex); | |
147 | if (root->log_root) { | |
995946dd | 148 | if (btrfs_need_log_full_commit(root->fs_info, trans)) { |
50471a38 MX |
149 | ret = -EAGAIN; |
150 | goto out; | |
151 | } | |
ff782e0a JB |
152 | if (!root->log_start_pid) { |
153 | root->log_start_pid = current->pid; | |
27cdeb70 | 154 | clear_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state); |
ff782e0a | 155 | } else if (root->log_start_pid != current->pid) { |
27cdeb70 | 156 | set_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state); |
ff782e0a JB |
157 | } |
158 | ||
2ecb7923 | 159 | atomic_inc(&root->log_batch); |
7237f183 | 160 | atomic_inc(&root->log_writers); |
8b050d35 MX |
161 | if (ctx) { |
162 | index = root->log_transid % 2; | |
163 | list_add_tail(&ctx->list, &root->log_ctxs[index]); | |
d1433deb | 164 | ctx->log_transid = root->log_transid; |
8b050d35 | 165 | } |
7237f183 YZ |
166 | mutex_unlock(&root->log_mutex); |
167 | return 0; | |
168 | } | |
e87ac136 MX |
169 | |
170 | ret = 0; | |
e02119d5 | 171 | mutex_lock(&root->fs_info->tree_log_mutex); |
e87ac136 | 172 | if (!root->fs_info->log_root_tree) |
e02119d5 | 173 | ret = btrfs_init_log_root_tree(trans, root->fs_info); |
e87ac136 MX |
174 | mutex_unlock(&root->fs_info->tree_log_mutex); |
175 | if (ret) | |
176 | goto out; | |
177 | ||
178 | if (!root->log_root) { | |
e02119d5 | 179 | ret = btrfs_add_log_tree(trans, root); |
4a500fd1 | 180 | if (ret) |
e87ac136 | 181 | goto out; |
e02119d5 | 182 | } |
27cdeb70 | 183 | clear_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state); |
e87ac136 | 184 | root->log_start_pid = current->pid; |
2ecb7923 | 185 | atomic_inc(&root->log_batch); |
7237f183 | 186 | atomic_inc(&root->log_writers); |
8b050d35 MX |
187 | if (ctx) { |
188 | index = root->log_transid % 2; | |
189 | list_add_tail(&ctx->list, &root->log_ctxs[index]); | |
d1433deb | 190 | ctx->log_transid = root->log_transid; |
8b050d35 | 191 | } |
e87ac136 | 192 | out: |
7237f183 | 193 | mutex_unlock(&root->log_mutex); |
e87ac136 | 194 | return ret; |
e02119d5 CM |
195 | } |
196 | ||
197 | /* | |
198 | * returns 0 if there was a log transaction running and we were able | |
199 | * to join, or returns -ENOENT if there were not transactions | |
200 | * in progress | |
201 | */ | |
202 | static int join_running_log_trans(struct btrfs_root *root) | |
203 | { | |
204 | int ret = -ENOENT; | |
205 | ||
206 | smp_mb(); | |
207 | if (!root->log_root) | |
208 | return -ENOENT; | |
209 | ||
7237f183 | 210 | mutex_lock(&root->log_mutex); |
e02119d5 CM |
211 | if (root->log_root) { |
212 | ret = 0; | |
7237f183 | 213 | atomic_inc(&root->log_writers); |
e02119d5 | 214 | } |
7237f183 | 215 | mutex_unlock(&root->log_mutex); |
e02119d5 CM |
216 | return ret; |
217 | } | |
218 | ||
12fcfd22 CM |
219 | /* |
220 | * This either makes the current running log transaction wait | |
221 | * until you call btrfs_end_log_trans() or it makes any future | |
222 | * log transactions wait until you call btrfs_end_log_trans() | |
223 | */ | |
224 | int btrfs_pin_log_trans(struct btrfs_root *root) | |
225 | { | |
226 | int ret = -ENOENT; | |
227 | ||
228 | mutex_lock(&root->log_mutex); | |
229 | atomic_inc(&root->log_writers); | |
230 | mutex_unlock(&root->log_mutex); | |
231 | return ret; | |
232 | } | |
233 | ||
e02119d5 CM |
234 | /* |
235 | * indicate we're done making changes to the log tree | |
236 | * and wake up anyone waiting to do a sync | |
237 | */ | |
143bede5 | 238 | void btrfs_end_log_trans(struct btrfs_root *root) |
e02119d5 | 239 | { |
7237f183 YZ |
240 | if (atomic_dec_and_test(&root->log_writers)) { |
241 | smp_mb(); | |
242 | if (waitqueue_active(&root->log_writer_wait)) | |
243 | wake_up(&root->log_writer_wait); | |
244 | } | |
e02119d5 CM |
245 | } |
246 | ||
247 | ||
248 | /* | |
249 | * the walk control struct is used to pass state down the chain when | |
250 | * processing the log tree. The stage field tells us which part | |
251 | * of the log tree processing we are currently doing. The others | |
252 | * are state fields used for that specific part | |
253 | */ | |
254 | struct walk_control { | |
255 | /* should we free the extent on disk when done? This is used | |
256 | * at transaction commit time while freeing a log tree | |
257 | */ | |
258 | int free; | |
259 | ||
260 | /* should we write out the extent buffer? This is used | |
261 | * while flushing the log tree to disk during a sync | |
262 | */ | |
263 | int write; | |
264 | ||
265 | /* should we wait for the extent buffer io to finish? Also used | |
266 | * while flushing the log tree to disk for a sync | |
267 | */ | |
268 | int wait; | |
269 | ||
270 | /* pin only walk, we record which extents on disk belong to the | |
271 | * log trees | |
272 | */ | |
273 | int pin; | |
274 | ||
275 | /* what stage of the replay code we're currently in */ | |
276 | int stage; | |
277 | ||
278 | /* the root we are currently replaying */ | |
279 | struct btrfs_root *replay_dest; | |
280 | ||
281 | /* the trans handle for the current replay */ | |
282 | struct btrfs_trans_handle *trans; | |
283 | ||
284 | /* the function that gets used to process blocks we find in the | |
285 | * tree. Note the extent_buffer might not be up to date when it is | |
286 | * passed in, and it must be checked or read if you need the data | |
287 | * inside it | |
288 | */ | |
289 | int (*process_func)(struct btrfs_root *log, struct extent_buffer *eb, | |
290 | struct walk_control *wc, u64 gen); | |
291 | }; | |
292 | ||
293 | /* | |
294 | * process_func used to pin down extents, write them or wait on them | |
295 | */ | |
296 | static int process_one_buffer(struct btrfs_root *log, | |
297 | struct extent_buffer *eb, | |
298 | struct walk_control *wc, u64 gen) | |
299 | { | |
b50c6e25 JB |
300 | int ret = 0; |
301 | ||
8c2a1a30 JB |
302 | /* |
303 | * If this fs is mixed then we need to be able to process the leaves to | |
304 | * pin down any logged extents, so we have to read the block. | |
305 | */ | |
306 | if (btrfs_fs_incompat(log->fs_info, MIXED_GROUPS)) { | |
307 | ret = btrfs_read_buffer(eb, gen); | |
308 | if (ret) | |
309 | return ret; | |
310 | } | |
311 | ||
04018de5 | 312 | if (wc->pin) |
b50c6e25 JB |
313 | ret = btrfs_pin_extent_for_log_replay(log->fs_info->extent_root, |
314 | eb->start, eb->len); | |
e02119d5 | 315 | |
b50c6e25 | 316 | if (!ret && btrfs_buffer_uptodate(eb, gen, 0)) { |
8c2a1a30 JB |
317 | if (wc->pin && btrfs_header_level(eb) == 0) |
318 | ret = btrfs_exclude_logged_extents(log, eb); | |
e02119d5 CM |
319 | if (wc->write) |
320 | btrfs_write_tree_block(eb); | |
321 | if (wc->wait) | |
322 | btrfs_wait_tree_block_writeback(eb); | |
323 | } | |
b50c6e25 | 324 | return ret; |
e02119d5 CM |
325 | } |
326 | ||
327 | /* | |
328 | * Item overwrite used by replay and tree logging. eb, slot and key all refer | |
329 | * to the src data we are copying out. | |
330 | * | |
331 | * root is the tree we are copying into, and path is a scratch | |
332 | * path for use in this function (it should be released on entry and | |
333 | * will be released on exit). | |
334 | * | |
335 | * If the key is already in the destination tree the existing item is | |
336 | * overwritten. If the existing item isn't big enough, it is extended. | |
337 | * If it is too large, it is truncated. | |
338 | * | |
339 | * If the key isn't in the destination yet, a new item is inserted. | |
340 | */ | |
341 | static noinline int overwrite_item(struct btrfs_trans_handle *trans, | |
342 | struct btrfs_root *root, | |
343 | struct btrfs_path *path, | |
344 | struct extent_buffer *eb, int slot, | |
345 | struct btrfs_key *key) | |
346 | { | |
347 | int ret; | |
348 | u32 item_size; | |
349 | u64 saved_i_size = 0; | |
350 | int save_old_i_size = 0; | |
351 | unsigned long src_ptr; | |
352 | unsigned long dst_ptr; | |
353 | int overwrite_root = 0; | |
4bc4bee4 | 354 | bool inode_item = key->type == BTRFS_INODE_ITEM_KEY; |
e02119d5 CM |
355 | |
356 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
357 | overwrite_root = 1; | |
358 | ||
359 | item_size = btrfs_item_size_nr(eb, slot); | |
360 | src_ptr = btrfs_item_ptr_offset(eb, slot); | |
361 | ||
362 | /* look for the key in the destination tree */ | |
363 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); | |
4bc4bee4 JB |
364 | if (ret < 0) |
365 | return ret; | |
366 | ||
e02119d5 CM |
367 | if (ret == 0) { |
368 | char *src_copy; | |
369 | char *dst_copy; | |
370 | u32 dst_size = btrfs_item_size_nr(path->nodes[0], | |
371 | path->slots[0]); | |
372 | if (dst_size != item_size) | |
373 | goto insert; | |
374 | ||
375 | if (item_size == 0) { | |
b3b4aa74 | 376 | btrfs_release_path(path); |
e02119d5 CM |
377 | return 0; |
378 | } | |
379 | dst_copy = kmalloc(item_size, GFP_NOFS); | |
380 | src_copy = kmalloc(item_size, GFP_NOFS); | |
2a29edc6 | 381 | if (!dst_copy || !src_copy) { |
b3b4aa74 | 382 | btrfs_release_path(path); |
2a29edc6 | 383 | kfree(dst_copy); |
384 | kfree(src_copy); | |
385 | return -ENOMEM; | |
386 | } | |
e02119d5 CM |
387 | |
388 | read_extent_buffer(eb, src_copy, src_ptr, item_size); | |
389 | ||
390 | dst_ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); | |
391 | read_extent_buffer(path->nodes[0], dst_copy, dst_ptr, | |
392 | item_size); | |
393 | ret = memcmp(dst_copy, src_copy, item_size); | |
394 | ||
395 | kfree(dst_copy); | |
396 | kfree(src_copy); | |
397 | /* | |
398 | * they have the same contents, just return, this saves | |
399 | * us from cowing blocks in the destination tree and doing | |
400 | * extra writes that may not have been done by a previous | |
401 | * sync | |
402 | */ | |
403 | if (ret == 0) { | |
b3b4aa74 | 404 | btrfs_release_path(path); |
e02119d5 CM |
405 | return 0; |
406 | } | |
407 | ||
4bc4bee4 JB |
408 | /* |
409 | * We need to load the old nbytes into the inode so when we | |
410 | * replay the extents we've logged we get the right nbytes. | |
411 | */ | |
412 | if (inode_item) { | |
413 | struct btrfs_inode_item *item; | |
414 | u64 nbytes; | |
d555438b | 415 | u32 mode; |
4bc4bee4 JB |
416 | |
417 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
418 | struct btrfs_inode_item); | |
419 | nbytes = btrfs_inode_nbytes(path->nodes[0], item); | |
420 | item = btrfs_item_ptr(eb, slot, | |
421 | struct btrfs_inode_item); | |
422 | btrfs_set_inode_nbytes(eb, item, nbytes); | |
d555438b JB |
423 | |
424 | /* | |
425 | * If this is a directory we need to reset the i_size to | |
426 | * 0 so that we can set it up properly when replaying | |
427 | * the rest of the items in this log. | |
428 | */ | |
429 | mode = btrfs_inode_mode(eb, item); | |
430 | if (S_ISDIR(mode)) | |
431 | btrfs_set_inode_size(eb, item, 0); | |
4bc4bee4 JB |
432 | } |
433 | } else if (inode_item) { | |
434 | struct btrfs_inode_item *item; | |
d555438b | 435 | u32 mode; |
4bc4bee4 JB |
436 | |
437 | /* | |
438 | * New inode, set nbytes to 0 so that the nbytes comes out | |
439 | * properly when we replay the extents. | |
440 | */ | |
441 | item = btrfs_item_ptr(eb, slot, struct btrfs_inode_item); | |
442 | btrfs_set_inode_nbytes(eb, item, 0); | |
d555438b JB |
443 | |
444 | /* | |
445 | * If this is a directory we need to reset the i_size to 0 so | |
446 | * that we can set it up properly when replaying the rest of | |
447 | * the items in this log. | |
448 | */ | |
449 | mode = btrfs_inode_mode(eb, item); | |
450 | if (S_ISDIR(mode)) | |
451 | btrfs_set_inode_size(eb, item, 0); | |
e02119d5 CM |
452 | } |
453 | insert: | |
b3b4aa74 | 454 | btrfs_release_path(path); |
e02119d5 | 455 | /* try to insert the key into the destination tree */ |
df8d116f | 456 | path->skip_release_on_error = 1; |
e02119d5 CM |
457 | ret = btrfs_insert_empty_item(trans, root, path, |
458 | key, item_size); | |
df8d116f | 459 | path->skip_release_on_error = 0; |
e02119d5 CM |
460 | |
461 | /* make sure any existing item is the correct size */ | |
df8d116f | 462 | if (ret == -EEXIST || ret == -EOVERFLOW) { |
e02119d5 CM |
463 | u32 found_size; |
464 | found_size = btrfs_item_size_nr(path->nodes[0], | |
465 | path->slots[0]); | |
143bede5 | 466 | if (found_size > item_size) |
afe5fea7 | 467 | btrfs_truncate_item(root, path, item_size, 1); |
143bede5 | 468 | else if (found_size < item_size) |
4b90c680 | 469 | btrfs_extend_item(root, path, |
143bede5 | 470 | item_size - found_size); |
e02119d5 | 471 | } else if (ret) { |
4a500fd1 | 472 | return ret; |
e02119d5 CM |
473 | } |
474 | dst_ptr = btrfs_item_ptr_offset(path->nodes[0], | |
475 | path->slots[0]); | |
476 | ||
477 | /* don't overwrite an existing inode if the generation number | |
478 | * was logged as zero. This is done when the tree logging code | |
479 | * is just logging an inode to make sure it exists after recovery. | |
480 | * | |
481 | * Also, don't overwrite i_size on directories during replay. | |
482 | * log replay inserts and removes directory items based on the | |
483 | * state of the tree found in the subvolume, and i_size is modified | |
484 | * as it goes | |
485 | */ | |
486 | if (key->type == BTRFS_INODE_ITEM_KEY && ret == -EEXIST) { | |
487 | struct btrfs_inode_item *src_item; | |
488 | struct btrfs_inode_item *dst_item; | |
489 | ||
490 | src_item = (struct btrfs_inode_item *)src_ptr; | |
491 | dst_item = (struct btrfs_inode_item *)dst_ptr; | |
492 | ||
1a4bcf47 FM |
493 | if (btrfs_inode_generation(eb, src_item) == 0) { |
494 | struct extent_buffer *dst_eb = path->nodes[0]; | |
2f2ff0ee | 495 | const u64 ino_size = btrfs_inode_size(eb, src_item); |
1a4bcf47 | 496 | |
2f2ff0ee FM |
497 | /* |
498 | * For regular files an ino_size == 0 is used only when | |
499 | * logging that an inode exists, as part of a directory | |
500 | * fsync, and the inode wasn't fsynced before. In this | |
501 | * case don't set the size of the inode in the fs/subvol | |
502 | * tree, otherwise we would be throwing valid data away. | |
503 | */ | |
1a4bcf47 | 504 | if (S_ISREG(btrfs_inode_mode(eb, src_item)) && |
2f2ff0ee FM |
505 | S_ISREG(btrfs_inode_mode(dst_eb, dst_item)) && |
506 | ino_size != 0) { | |
1a4bcf47 | 507 | struct btrfs_map_token token; |
1a4bcf47 FM |
508 | |
509 | btrfs_init_map_token(&token); | |
510 | btrfs_set_token_inode_size(dst_eb, dst_item, | |
511 | ino_size, &token); | |
512 | } | |
e02119d5 | 513 | goto no_copy; |
1a4bcf47 | 514 | } |
e02119d5 CM |
515 | |
516 | if (overwrite_root && | |
517 | S_ISDIR(btrfs_inode_mode(eb, src_item)) && | |
518 | S_ISDIR(btrfs_inode_mode(path->nodes[0], dst_item))) { | |
519 | save_old_i_size = 1; | |
520 | saved_i_size = btrfs_inode_size(path->nodes[0], | |
521 | dst_item); | |
522 | } | |
523 | } | |
524 | ||
525 | copy_extent_buffer(path->nodes[0], eb, dst_ptr, | |
526 | src_ptr, item_size); | |
527 | ||
528 | if (save_old_i_size) { | |
529 | struct btrfs_inode_item *dst_item; | |
530 | dst_item = (struct btrfs_inode_item *)dst_ptr; | |
531 | btrfs_set_inode_size(path->nodes[0], dst_item, saved_i_size); | |
532 | } | |
533 | ||
534 | /* make sure the generation is filled in */ | |
535 | if (key->type == BTRFS_INODE_ITEM_KEY) { | |
536 | struct btrfs_inode_item *dst_item; | |
537 | dst_item = (struct btrfs_inode_item *)dst_ptr; | |
538 | if (btrfs_inode_generation(path->nodes[0], dst_item) == 0) { | |
539 | btrfs_set_inode_generation(path->nodes[0], dst_item, | |
540 | trans->transid); | |
541 | } | |
542 | } | |
543 | no_copy: | |
544 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
b3b4aa74 | 545 | btrfs_release_path(path); |
e02119d5 CM |
546 | return 0; |
547 | } | |
548 | ||
549 | /* | |
550 | * simple helper to read an inode off the disk from a given root | |
551 | * This can only be called for subvolume roots and not for the log | |
552 | */ | |
553 | static noinline struct inode *read_one_inode(struct btrfs_root *root, | |
554 | u64 objectid) | |
555 | { | |
5d4f98a2 | 556 | struct btrfs_key key; |
e02119d5 | 557 | struct inode *inode; |
e02119d5 | 558 | |
5d4f98a2 YZ |
559 | key.objectid = objectid; |
560 | key.type = BTRFS_INODE_ITEM_KEY; | |
561 | key.offset = 0; | |
73f73415 | 562 | inode = btrfs_iget(root->fs_info->sb, &key, root, NULL); |
5d4f98a2 YZ |
563 | if (IS_ERR(inode)) { |
564 | inode = NULL; | |
565 | } else if (is_bad_inode(inode)) { | |
e02119d5 CM |
566 | iput(inode); |
567 | inode = NULL; | |
568 | } | |
569 | return inode; | |
570 | } | |
571 | ||
572 | /* replays a single extent in 'eb' at 'slot' with 'key' into the | |
573 | * subvolume 'root'. path is released on entry and should be released | |
574 | * on exit. | |
575 | * | |
576 | * extents in the log tree have not been allocated out of the extent | |
577 | * tree yet. So, this completes the allocation, taking a reference | |
578 | * as required if the extent already exists or creating a new extent | |
579 | * if it isn't in the extent allocation tree yet. | |
580 | * | |
581 | * The extent is inserted into the file, dropping any existing extents | |
582 | * from the file that overlap the new one. | |
583 | */ | |
584 | static noinline int replay_one_extent(struct btrfs_trans_handle *trans, | |
585 | struct btrfs_root *root, | |
586 | struct btrfs_path *path, | |
587 | struct extent_buffer *eb, int slot, | |
588 | struct btrfs_key *key) | |
589 | { | |
590 | int found_type; | |
e02119d5 | 591 | u64 extent_end; |
e02119d5 | 592 | u64 start = key->offset; |
4bc4bee4 | 593 | u64 nbytes = 0; |
e02119d5 CM |
594 | struct btrfs_file_extent_item *item; |
595 | struct inode *inode = NULL; | |
596 | unsigned long size; | |
597 | int ret = 0; | |
598 | ||
599 | item = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item); | |
600 | found_type = btrfs_file_extent_type(eb, item); | |
601 | ||
d899e052 | 602 | if (found_type == BTRFS_FILE_EXTENT_REG || |
4bc4bee4 JB |
603 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { |
604 | nbytes = btrfs_file_extent_num_bytes(eb, item); | |
605 | extent_end = start + nbytes; | |
606 | ||
607 | /* | |
608 | * We don't add to the inodes nbytes if we are prealloc or a | |
609 | * hole. | |
610 | */ | |
611 | if (btrfs_file_extent_disk_bytenr(eb, item) == 0) | |
612 | nbytes = 0; | |
613 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
514ac8ad | 614 | size = btrfs_file_extent_inline_len(eb, slot, item); |
4bc4bee4 | 615 | nbytes = btrfs_file_extent_ram_bytes(eb, item); |
fda2832f | 616 | extent_end = ALIGN(start + size, root->sectorsize); |
e02119d5 CM |
617 | } else { |
618 | ret = 0; | |
619 | goto out; | |
620 | } | |
621 | ||
622 | inode = read_one_inode(root, key->objectid); | |
623 | if (!inode) { | |
624 | ret = -EIO; | |
625 | goto out; | |
626 | } | |
627 | ||
628 | /* | |
629 | * first check to see if we already have this extent in the | |
630 | * file. This must be done before the btrfs_drop_extents run | |
631 | * so we don't try to drop this extent. | |
632 | */ | |
33345d01 | 633 | ret = btrfs_lookup_file_extent(trans, root, path, btrfs_ino(inode), |
e02119d5 CM |
634 | start, 0); |
635 | ||
d899e052 YZ |
636 | if (ret == 0 && |
637 | (found_type == BTRFS_FILE_EXTENT_REG || | |
638 | found_type == BTRFS_FILE_EXTENT_PREALLOC)) { | |
e02119d5 CM |
639 | struct btrfs_file_extent_item cmp1; |
640 | struct btrfs_file_extent_item cmp2; | |
641 | struct btrfs_file_extent_item *existing; | |
642 | struct extent_buffer *leaf; | |
643 | ||
644 | leaf = path->nodes[0]; | |
645 | existing = btrfs_item_ptr(leaf, path->slots[0], | |
646 | struct btrfs_file_extent_item); | |
647 | ||
648 | read_extent_buffer(eb, &cmp1, (unsigned long)item, | |
649 | sizeof(cmp1)); | |
650 | read_extent_buffer(leaf, &cmp2, (unsigned long)existing, | |
651 | sizeof(cmp2)); | |
652 | ||
653 | /* | |
654 | * we already have a pointer to this exact extent, | |
655 | * we don't have to do anything | |
656 | */ | |
657 | if (memcmp(&cmp1, &cmp2, sizeof(cmp1)) == 0) { | |
b3b4aa74 | 658 | btrfs_release_path(path); |
e02119d5 CM |
659 | goto out; |
660 | } | |
661 | } | |
b3b4aa74 | 662 | btrfs_release_path(path); |
e02119d5 CM |
663 | |
664 | /* drop any overlapping extents */ | |
2671485d | 665 | ret = btrfs_drop_extents(trans, root, inode, start, extent_end, 1); |
3650860b JB |
666 | if (ret) |
667 | goto out; | |
e02119d5 | 668 | |
07d400a6 YZ |
669 | if (found_type == BTRFS_FILE_EXTENT_REG || |
670 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
5d4f98a2 | 671 | u64 offset; |
07d400a6 YZ |
672 | unsigned long dest_offset; |
673 | struct btrfs_key ins; | |
674 | ||
675 | ret = btrfs_insert_empty_item(trans, root, path, key, | |
676 | sizeof(*item)); | |
3650860b JB |
677 | if (ret) |
678 | goto out; | |
07d400a6 YZ |
679 | dest_offset = btrfs_item_ptr_offset(path->nodes[0], |
680 | path->slots[0]); | |
681 | copy_extent_buffer(path->nodes[0], eb, dest_offset, | |
682 | (unsigned long)item, sizeof(*item)); | |
683 | ||
684 | ins.objectid = btrfs_file_extent_disk_bytenr(eb, item); | |
685 | ins.offset = btrfs_file_extent_disk_num_bytes(eb, item); | |
686 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
5d4f98a2 | 687 | offset = key->offset - btrfs_file_extent_offset(eb, item); |
07d400a6 YZ |
688 | |
689 | if (ins.objectid > 0) { | |
690 | u64 csum_start; | |
691 | u64 csum_end; | |
692 | LIST_HEAD(ordered_sums); | |
693 | /* | |
694 | * is this extent already allocated in the extent | |
695 | * allocation tree? If so, just add a reference | |
696 | */ | |
1a4ed8fd | 697 | ret = btrfs_lookup_data_extent(root, ins.objectid, |
07d400a6 YZ |
698 | ins.offset); |
699 | if (ret == 0) { | |
700 | ret = btrfs_inc_extent_ref(trans, root, | |
701 | ins.objectid, ins.offset, | |
5d4f98a2 | 702 | 0, root->root_key.objectid, |
66d7e7f0 | 703 | key->objectid, offset, 0); |
b50c6e25 JB |
704 | if (ret) |
705 | goto out; | |
07d400a6 YZ |
706 | } else { |
707 | /* | |
708 | * insert the extent pointer in the extent | |
709 | * allocation tree | |
710 | */ | |
5d4f98a2 YZ |
711 | ret = btrfs_alloc_logged_file_extent(trans, |
712 | root, root->root_key.objectid, | |
713 | key->objectid, offset, &ins); | |
b50c6e25 JB |
714 | if (ret) |
715 | goto out; | |
07d400a6 | 716 | } |
b3b4aa74 | 717 | btrfs_release_path(path); |
07d400a6 YZ |
718 | |
719 | if (btrfs_file_extent_compression(eb, item)) { | |
720 | csum_start = ins.objectid; | |
721 | csum_end = csum_start + ins.offset; | |
722 | } else { | |
723 | csum_start = ins.objectid + | |
724 | btrfs_file_extent_offset(eb, item); | |
725 | csum_end = csum_start + | |
726 | btrfs_file_extent_num_bytes(eb, item); | |
727 | } | |
728 | ||
729 | ret = btrfs_lookup_csums_range(root->log_root, | |
730 | csum_start, csum_end - 1, | |
a2de733c | 731 | &ordered_sums, 0); |
3650860b JB |
732 | if (ret) |
733 | goto out; | |
07d400a6 YZ |
734 | while (!list_empty(&ordered_sums)) { |
735 | struct btrfs_ordered_sum *sums; | |
736 | sums = list_entry(ordered_sums.next, | |
737 | struct btrfs_ordered_sum, | |
738 | list); | |
3650860b JB |
739 | if (!ret) |
740 | ret = btrfs_csum_file_blocks(trans, | |
07d400a6 YZ |
741 | root->fs_info->csum_root, |
742 | sums); | |
07d400a6 YZ |
743 | list_del(&sums->list); |
744 | kfree(sums); | |
745 | } | |
3650860b JB |
746 | if (ret) |
747 | goto out; | |
07d400a6 | 748 | } else { |
b3b4aa74 | 749 | btrfs_release_path(path); |
07d400a6 YZ |
750 | } |
751 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
752 | /* inline extents are easy, we just overwrite them */ | |
753 | ret = overwrite_item(trans, root, path, eb, slot, key); | |
3650860b JB |
754 | if (ret) |
755 | goto out; | |
07d400a6 | 756 | } |
e02119d5 | 757 | |
4bc4bee4 | 758 | inode_add_bytes(inode, nbytes); |
b9959295 | 759 | ret = btrfs_update_inode(trans, root, inode); |
e02119d5 CM |
760 | out: |
761 | if (inode) | |
762 | iput(inode); | |
763 | return ret; | |
764 | } | |
765 | ||
766 | /* | |
767 | * when cleaning up conflicts between the directory names in the | |
768 | * subvolume, directory names in the log and directory names in the | |
769 | * inode back references, we may have to unlink inodes from directories. | |
770 | * | |
771 | * This is a helper function to do the unlink of a specific directory | |
772 | * item | |
773 | */ | |
774 | static noinline int drop_one_dir_item(struct btrfs_trans_handle *trans, | |
775 | struct btrfs_root *root, | |
776 | struct btrfs_path *path, | |
777 | struct inode *dir, | |
778 | struct btrfs_dir_item *di) | |
779 | { | |
780 | struct inode *inode; | |
781 | char *name; | |
782 | int name_len; | |
783 | struct extent_buffer *leaf; | |
784 | struct btrfs_key location; | |
785 | int ret; | |
786 | ||
787 | leaf = path->nodes[0]; | |
788 | ||
789 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
790 | name_len = btrfs_dir_name_len(leaf, di); | |
791 | name = kmalloc(name_len, GFP_NOFS); | |
2a29edc6 | 792 | if (!name) |
793 | return -ENOMEM; | |
794 | ||
e02119d5 | 795 | read_extent_buffer(leaf, name, (unsigned long)(di + 1), name_len); |
b3b4aa74 | 796 | btrfs_release_path(path); |
e02119d5 CM |
797 | |
798 | inode = read_one_inode(root, location.objectid); | |
c00e9493 | 799 | if (!inode) { |
3650860b JB |
800 | ret = -EIO; |
801 | goto out; | |
c00e9493 | 802 | } |
e02119d5 | 803 | |
ec051c0f | 804 | ret = link_to_fixup_dir(trans, root, path, location.objectid); |
3650860b JB |
805 | if (ret) |
806 | goto out; | |
12fcfd22 | 807 | |
e02119d5 | 808 | ret = btrfs_unlink_inode(trans, root, dir, inode, name, name_len); |
3650860b JB |
809 | if (ret) |
810 | goto out; | |
ada9af21 FDBM |
811 | else |
812 | ret = btrfs_run_delayed_items(trans, root); | |
3650860b | 813 | out: |
e02119d5 | 814 | kfree(name); |
e02119d5 CM |
815 | iput(inode); |
816 | return ret; | |
817 | } | |
818 | ||
819 | /* | |
820 | * helper function to see if a given name and sequence number found | |
821 | * in an inode back reference are already in a directory and correctly | |
822 | * point to this inode | |
823 | */ | |
824 | static noinline int inode_in_dir(struct btrfs_root *root, | |
825 | struct btrfs_path *path, | |
826 | u64 dirid, u64 objectid, u64 index, | |
827 | const char *name, int name_len) | |
828 | { | |
829 | struct btrfs_dir_item *di; | |
830 | struct btrfs_key location; | |
831 | int match = 0; | |
832 | ||
833 | di = btrfs_lookup_dir_index_item(NULL, root, path, dirid, | |
834 | index, name, name_len, 0); | |
835 | if (di && !IS_ERR(di)) { | |
836 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
837 | if (location.objectid != objectid) | |
838 | goto out; | |
839 | } else | |
840 | goto out; | |
b3b4aa74 | 841 | btrfs_release_path(path); |
e02119d5 CM |
842 | |
843 | di = btrfs_lookup_dir_item(NULL, root, path, dirid, name, name_len, 0); | |
844 | if (di && !IS_ERR(di)) { | |
845 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
846 | if (location.objectid != objectid) | |
847 | goto out; | |
848 | } else | |
849 | goto out; | |
850 | match = 1; | |
851 | out: | |
b3b4aa74 | 852 | btrfs_release_path(path); |
e02119d5 CM |
853 | return match; |
854 | } | |
855 | ||
856 | /* | |
857 | * helper function to check a log tree for a named back reference in | |
858 | * an inode. This is used to decide if a back reference that is | |
859 | * found in the subvolume conflicts with what we find in the log. | |
860 | * | |
861 | * inode backreferences may have multiple refs in a single item, | |
862 | * during replay we process one reference at a time, and we don't | |
863 | * want to delete valid links to a file from the subvolume if that | |
864 | * link is also in the log. | |
865 | */ | |
866 | static noinline int backref_in_log(struct btrfs_root *log, | |
867 | struct btrfs_key *key, | |
f186373f | 868 | u64 ref_objectid, |
df8d116f | 869 | const char *name, int namelen) |
e02119d5 CM |
870 | { |
871 | struct btrfs_path *path; | |
872 | struct btrfs_inode_ref *ref; | |
873 | unsigned long ptr; | |
874 | unsigned long ptr_end; | |
875 | unsigned long name_ptr; | |
876 | int found_name_len; | |
877 | int item_size; | |
878 | int ret; | |
879 | int match = 0; | |
880 | ||
881 | path = btrfs_alloc_path(); | |
2a29edc6 | 882 | if (!path) |
883 | return -ENOMEM; | |
884 | ||
e02119d5 CM |
885 | ret = btrfs_search_slot(NULL, log, key, path, 0, 0); |
886 | if (ret != 0) | |
887 | goto out; | |
888 | ||
e02119d5 | 889 | ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); |
f186373f MF |
890 | |
891 | if (key->type == BTRFS_INODE_EXTREF_KEY) { | |
892 | if (btrfs_find_name_in_ext_backref(path, ref_objectid, | |
893 | name, namelen, NULL)) | |
894 | match = 1; | |
895 | ||
896 | goto out; | |
897 | } | |
898 | ||
899 | item_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]); | |
e02119d5 CM |
900 | ptr_end = ptr + item_size; |
901 | while (ptr < ptr_end) { | |
902 | ref = (struct btrfs_inode_ref *)ptr; | |
903 | found_name_len = btrfs_inode_ref_name_len(path->nodes[0], ref); | |
904 | if (found_name_len == namelen) { | |
905 | name_ptr = (unsigned long)(ref + 1); | |
906 | ret = memcmp_extent_buffer(path->nodes[0], name, | |
907 | name_ptr, namelen); | |
908 | if (ret == 0) { | |
909 | match = 1; | |
910 | goto out; | |
911 | } | |
912 | } | |
913 | ptr = (unsigned long)(ref + 1) + found_name_len; | |
914 | } | |
915 | out: | |
916 | btrfs_free_path(path); | |
917 | return match; | |
918 | } | |
919 | ||
5a1d7843 | 920 | static inline int __add_inode_ref(struct btrfs_trans_handle *trans, |
e02119d5 | 921 | struct btrfs_root *root, |
e02119d5 | 922 | struct btrfs_path *path, |
5a1d7843 JS |
923 | struct btrfs_root *log_root, |
924 | struct inode *dir, struct inode *inode, | |
5a1d7843 | 925 | struct extent_buffer *eb, |
f186373f MF |
926 | u64 inode_objectid, u64 parent_objectid, |
927 | u64 ref_index, char *name, int namelen, | |
928 | int *search_done) | |
e02119d5 | 929 | { |
34f3e4f2 | 930 | int ret; |
f186373f MF |
931 | char *victim_name; |
932 | int victim_name_len; | |
933 | struct extent_buffer *leaf; | |
5a1d7843 | 934 | struct btrfs_dir_item *di; |
f186373f MF |
935 | struct btrfs_key search_key; |
936 | struct btrfs_inode_extref *extref; | |
c622ae60 | 937 | |
f186373f MF |
938 | again: |
939 | /* Search old style refs */ | |
940 | search_key.objectid = inode_objectid; | |
941 | search_key.type = BTRFS_INODE_REF_KEY; | |
942 | search_key.offset = parent_objectid; | |
943 | ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0); | |
e02119d5 | 944 | if (ret == 0) { |
e02119d5 CM |
945 | struct btrfs_inode_ref *victim_ref; |
946 | unsigned long ptr; | |
947 | unsigned long ptr_end; | |
f186373f MF |
948 | |
949 | leaf = path->nodes[0]; | |
e02119d5 CM |
950 | |
951 | /* are we trying to overwrite a back ref for the root directory | |
952 | * if so, just jump out, we're done | |
953 | */ | |
f186373f | 954 | if (search_key.objectid == search_key.offset) |
5a1d7843 | 955 | return 1; |
e02119d5 CM |
956 | |
957 | /* check all the names in this back reference to see | |
958 | * if they are in the log. if so, we allow them to stay | |
959 | * otherwise they must be unlinked as a conflict | |
960 | */ | |
961 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
962 | ptr_end = ptr + btrfs_item_size_nr(leaf, path->slots[0]); | |
d397712b | 963 | while (ptr < ptr_end) { |
e02119d5 CM |
964 | victim_ref = (struct btrfs_inode_ref *)ptr; |
965 | victim_name_len = btrfs_inode_ref_name_len(leaf, | |
966 | victim_ref); | |
967 | victim_name = kmalloc(victim_name_len, GFP_NOFS); | |
3650860b JB |
968 | if (!victim_name) |
969 | return -ENOMEM; | |
e02119d5 CM |
970 | |
971 | read_extent_buffer(leaf, victim_name, | |
972 | (unsigned long)(victim_ref + 1), | |
973 | victim_name_len); | |
974 | ||
f186373f MF |
975 | if (!backref_in_log(log_root, &search_key, |
976 | parent_objectid, | |
977 | victim_name, | |
e02119d5 | 978 | victim_name_len)) { |
8b558c5f | 979 | inc_nlink(inode); |
b3b4aa74 | 980 | btrfs_release_path(path); |
12fcfd22 | 981 | |
e02119d5 CM |
982 | ret = btrfs_unlink_inode(trans, root, dir, |
983 | inode, victim_name, | |
984 | victim_name_len); | |
f186373f | 985 | kfree(victim_name); |
3650860b JB |
986 | if (ret) |
987 | return ret; | |
ada9af21 FDBM |
988 | ret = btrfs_run_delayed_items(trans, root); |
989 | if (ret) | |
990 | return ret; | |
f186373f MF |
991 | *search_done = 1; |
992 | goto again; | |
e02119d5 CM |
993 | } |
994 | kfree(victim_name); | |
f186373f | 995 | |
e02119d5 CM |
996 | ptr = (unsigned long)(victim_ref + 1) + victim_name_len; |
997 | } | |
e02119d5 | 998 | |
c622ae60 | 999 | /* |
1000 | * NOTE: we have searched root tree and checked the | |
1001 | * coresponding ref, it does not need to check again. | |
1002 | */ | |
5a1d7843 | 1003 | *search_done = 1; |
e02119d5 | 1004 | } |
b3b4aa74 | 1005 | btrfs_release_path(path); |
e02119d5 | 1006 | |
f186373f MF |
1007 | /* Same search but for extended refs */ |
1008 | extref = btrfs_lookup_inode_extref(NULL, root, path, name, namelen, | |
1009 | inode_objectid, parent_objectid, 0, | |
1010 | 0); | |
1011 | if (!IS_ERR_OR_NULL(extref)) { | |
1012 | u32 item_size; | |
1013 | u32 cur_offset = 0; | |
1014 | unsigned long base; | |
1015 | struct inode *victim_parent; | |
1016 | ||
1017 | leaf = path->nodes[0]; | |
1018 | ||
1019 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1020 | base = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
1021 | ||
1022 | while (cur_offset < item_size) { | |
dd9ef135 | 1023 | extref = (struct btrfs_inode_extref *)(base + cur_offset); |
f186373f MF |
1024 | |
1025 | victim_name_len = btrfs_inode_extref_name_len(leaf, extref); | |
1026 | ||
1027 | if (btrfs_inode_extref_parent(leaf, extref) != parent_objectid) | |
1028 | goto next; | |
1029 | ||
1030 | victim_name = kmalloc(victim_name_len, GFP_NOFS); | |
3650860b JB |
1031 | if (!victim_name) |
1032 | return -ENOMEM; | |
f186373f MF |
1033 | read_extent_buffer(leaf, victim_name, (unsigned long)&extref->name, |
1034 | victim_name_len); | |
1035 | ||
1036 | search_key.objectid = inode_objectid; | |
1037 | search_key.type = BTRFS_INODE_EXTREF_KEY; | |
1038 | search_key.offset = btrfs_extref_hash(parent_objectid, | |
1039 | victim_name, | |
1040 | victim_name_len); | |
1041 | ret = 0; | |
1042 | if (!backref_in_log(log_root, &search_key, | |
1043 | parent_objectid, victim_name, | |
1044 | victim_name_len)) { | |
1045 | ret = -ENOENT; | |
1046 | victim_parent = read_one_inode(root, | |
1047 | parent_objectid); | |
1048 | if (victim_parent) { | |
8b558c5f | 1049 | inc_nlink(inode); |
f186373f MF |
1050 | btrfs_release_path(path); |
1051 | ||
1052 | ret = btrfs_unlink_inode(trans, root, | |
1053 | victim_parent, | |
1054 | inode, | |
1055 | victim_name, | |
1056 | victim_name_len); | |
ada9af21 FDBM |
1057 | if (!ret) |
1058 | ret = btrfs_run_delayed_items( | |
1059 | trans, root); | |
f186373f | 1060 | } |
f186373f MF |
1061 | iput(victim_parent); |
1062 | kfree(victim_name); | |
3650860b JB |
1063 | if (ret) |
1064 | return ret; | |
f186373f MF |
1065 | *search_done = 1; |
1066 | goto again; | |
1067 | } | |
1068 | kfree(victim_name); | |
3650860b JB |
1069 | if (ret) |
1070 | return ret; | |
f186373f MF |
1071 | next: |
1072 | cur_offset += victim_name_len + sizeof(*extref); | |
1073 | } | |
1074 | *search_done = 1; | |
1075 | } | |
1076 | btrfs_release_path(path); | |
1077 | ||
34f3e4f2 | 1078 | /* look for a conflicting sequence number */ |
1079 | di = btrfs_lookup_dir_index_item(trans, root, path, btrfs_ino(dir), | |
f186373f | 1080 | ref_index, name, namelen, 0); |
34f3e4f2 | 1081 | if (di && !IS_ERR(di)) { |
1082 | ret = drop_one_dir_item(trans, root, path, dir, di); | |
3650860b JB |
1083 | if (ret) |
1084 | return ret; | |
34f3e4f2 | 1085 | } |
1086 | btrfs_release_path(path); | |
1087 | ||
1088 | /* look for a conflicing name */ | |
1089 | di = btrfs_lookup_dir_item(trans, root, path, btrfs_ino(dir), | |
1090 | name, namelen, 0); | |
1091 | if (di && !IS_ERR(di)) { | |
1092 | ret = drop_one_dir_item(trans, root, path, dir, di); | |
3650860b JB |
1093 | if (ret) |
1094 | return ret; | |
34f3e4f2 | 1095 | } |
1096 | btrfs_release_path(path); | |
1097 | ||
5a1d7843 JS |
1098 | return 0; |
1099 | } | |
e02119d5 | 1100 | |
f186373f MF |
1101 | static int extref_get_fields(struct extent_buffer *eb, unsigned long ref_ptr, |
1102 | u32 *namelen, char **name, u64 *index, | |
1103 | u64 *parent_objectid) | |
1104 | { | |
1105 | struct btrfs_inode_extref *extref; | |
1106 | ||
1107 | extref = (struct btrfs_inode_extref *)ref_ptr; | |
1108 | ||
1109 | *namelen = btrfs_inode_extref_name_len(eb, extref); | |
1110 | *name = kmalloc(*namelen, GFP_NOFS); | |
1111 | if (*name == NULL) | |
1112 | return -ENOMEM; | |
1113 | ||
1114 | read_extent_buffer(eb, *name, (unsigned long)&extref->name, | |
1115 | *namelen); | |
1116 | ||
1117 | *index = btrfs_inode_extref_index(eb, extref); | |
1118 | if (parent_objectid) | |
1119 | *parent_objectid = btrfs_inode_extref_parent(eb, extref); | |
1120 | ||
1121 | return 0; | |
1122 | } | |
1123 | ||
1124 | static int ref_get_fields(struct extent_buffer *eb, unsigned long ref_ptr, | |
1125 | u32 *namelen, char **name, u64 *index) | |
1126 | { | |
1127 | struct btrfs_inode_ref *ref; | |
1128 | ||
1129 | ref = (struct btrfs_inode_ref *)ref_ptr; | |
1130 | ||
1131 | *namelen = btrfs_inode_ref_name_len(eb, ref); | |
1132 | *name = kmalloc(*namelen, GFP_NOFS); | |
1133 | if (*name == NULL) | |
1134 | return -ENOMEM; | |
1135 | ||
1136 | read_extent_buffer(eb, *name, (unsigned long)(ref + 1), *namelen); | |
1137 | ||
1138 | *index = btrfs_inode_ref_index(eb, ref); | |
1139 | ||
1140 | return 0; | |
1141 | } | |
1142 | ||
5a1d7843 JS |
1143 | /* |
1144 | * replay one inode back reference item found in the log tree. | |
1145 | * eb, slot and key refer to the buffer and key found in the log tree. | |
1146 | * root is the destination we are replaying into, and path is for temp | |
1147 | * use by this function. (it should be released on return). | |
1148 | */ | |
1149 | static noinline int add_inode_ref(struct btrfs_trans_handle *trans, | |
1150 | struct btrfs_root *root, | |
1151 | struct btrfs_root *log, | |
1152 | struct btrfs_path *path, | |
1153 | struct extent_buffer *eb, int slot, | |
1154 | struct btrfs_key *key) | |
1155 | { | |
03b2f08b GB |
1156 | struct inode *dir = NULL; |
1157 | struct inode *inode = NULL; | |
5a1d7843 JS |
1158 | unsigned long ref_ptr; |
1159 | unsigned long ref_end; | |
03b2f08b | 1160 | char *name = NULL; |
5a1d7843 JS |
1161 | int namelen; |
1162 | int ret; | |
1163 | int search_done = 0; | |
f186373f MF |
1164 | int log_ref_ver = 0; |
1165 | u64 parent_objectid; | |
1166 | u64 inode_objectid; | |
f46dbe3d | 1167 | u64 ref_index = 0; |
f186373f MF |
1168 | int ref_struct_size; |
1169 | ||
1170 | ref_ptr = btrfs_item_ptr_offset(eb, slot); | |
1171 | ref_end = ref_ptr + btrfs_item_size_nr(eb, slot); | |
1172 | ||
1173 | if (key->type == BTRFS_INODE_EXTREF_KEY) { | |
1174 | struct btrfs_inode_extref *r; | |
1175 | ||
1176 | ref_struct_size = sizeof(struct btrfs_inode_extref); | |
1177 | log_ref_ver = 1; | |
1178 | r = (struct btrfs_inode_extref *)ref_ptr; | |
1179 | parent_objectid = btrfs_inode_extref_parent(eb, r); | |
1180 | } else { | |
1181 | ref_struct_size = sizeof(struct btrfs_inode_ref); | |
1182 | parent_objectid = key->offset; | |
1183 | } | |
1184 | inode_objectid = key->objectid; | |
e02119d5 | 1185 | |
5a1d7843 JS |
1186 | /* |
1187 | * it is possible that we didn't log all the parent directories | |
1188 | * for a given inode. If we don't find the dir, just don't | |
1189 | * copy the back ref in. The link count fixup code will take | |
1190 | * care of the rest | |
1191 | */ | |
f186373f | 1192 | dir = read_one_inode(root, parent_objectid); |
03b2f08b GB |
1193 | if (!dir) { |
1194 | ret = -ENOENT; | |
1195 | goto out; | |
1196 | } | |
5a1d7843 | 1197 | |
f186373f | 1198 | inode = read_one_inode(root, inode_objectid); |
5a1d7843 | 1199 | if (!inode) { |
03b2f08b GB |
1200 | ret = -EIO; |
1201 | goto out; | |
5a1d7843 JS |
1202 | } |
1203 | ||
5a1d7843 | 1204 | while (ref_ptr < ref_end) { |
f186373f MF |
1205 | if (log_ref_ver) { |
1206 | ret = extref_get_fields(eb, ref_ptr, &namelen, &name, | |
1207 | &ref_index, &parent_objectid); | |
1208 | /* | |
1209 | * parent object can change from one array | |
1210 | * item to another. | |
1211 | */ | |
1212 | if (!dir) | |
1213 | dir = read_one_inode(root, parent_objectid); | |
03b2f08b GB |
1214 | if (!dir) { |
1215 | ret = -ENOENT; | |
1216 | goto out; | |
1217 | } | |
f186373f MF |
1218 | } else { |
1219 | ret = ref_get_fields(eb, ref_ptr, &namelen, &name, | |
1220 | &ref_index); | |
1221 | } | |
1222 | if (ret) | |
03b2f08b | 1223 | goto out; |
5a1d7843 JS |
1224 | |
1225 | /* if we already have a perfect match, we're done */ | |
1226 | if (!inode_in_dir(root, path, btrfs_ino(dir), btrfs_ino(inode), | |
f186373f | 1227 | ref_index, name, namelen)) { |
5a1d7843 JS |
1228 | /* |
1229 | * look for a conflicting back reference in the | |
1230 | * metadata. if we find one we have to unlink that name | |
1231 | * of the file before we add our new link. Later on, we | |
1232 | * overwrite any existing back reference, and we don't | |
1233 | * want to create dangling pointers in the directory. | |
1234 | */ | |
1235 | ||
1236 | if (!search_done) { | |
1237 | ret = __add_inode_ref(trans, root, path, log, | |
f186373f MF |
1238 | dir, inode, eb, |
1239 | inode_objectid, | |
1240 | parent_objectid, | |
1241 | ref_index, name, namelen, | |
5a1d7843 | 1242 | &search_done); |
03b2f08b GB |
1243 | if (ret) { |
1244 | if (ret == 1) | |
1245 | ret = 0; | |
3650860b JB |
1246 | goto out; |
1247 | } | |
5a1d7843 JS |
1248 | } |
1249 | ||
1250 | /* insert our name */ | |
1251 | ret = btrfs_add_link(trans, dir, inode, name, namelen, | |
f186373f | 1252 | 0, ref_index); |
3650860b JB |
1253 | if (ret) |
1254 | goto out; | |
5a1d7843 JS |
1255 | |
1256 | btrfs_update_inode(trans, root, inode); | |
1257 | } | |
1258 | ||
f186373f | 1259 | ref_ptr = (unsigned long)(ref_ptr + ref_struct_size) + namelen; |
5a1d7843 | 1260 | kfree(name); |
03b2f08b | 1261 | name = NULL; |
f186373f MF |
1262 | if (log_ref_ver) { |
1263 | iput(dir); | |
1264 | dir = NULL; | |
1265 | } | |
5a1d7843 | 1266 | } |
e02119d5 CM |
1267 | |
1268 | /* finally write the back reference in the inode */ | |
1269 | ret = overwrite_item(trans, root, path, eb, slot, key); | |
5a1d7843 | 1270 | out: |
b3b4aa74 | 1271 | btrfs_release_path(path); |
03b2f08b | 1272 | kfree(name); |
e02119d5 CM |
1273 | iput(dir); |
1274 | iput(inode); | |
3650860b | 1275 | return ret; |
e02119d5 CM |
1276 | } |
1277 | ||
c71bf099 | 1278 | static int insert_orphan_item(struct btrfs_trans_handle *trans, |
9c4f61f0 | 1279 | struct btrfs_root *root, u64 ino) |
c71bf099 YZ |
1280 | { |
1281 | int ret; | |
381cf658 | 1282 | |
9c4f61f0 DS |
1283 | ret = btrfs_insert_orphan_item(trans, root, ino); |
1284 | if (ret == -EEXIST) | |
1285 | ret = 0; | |
381cf658 | 1286 | |
c71bf099 YZ |
1287 | return ret; |
1288 | } | |
1289 | ||
f186373f MF |
1290 | static int count_inode_extrefs(struct btrfs_root *root, |
1291 | struct inode *inode, struct btrfs_path *path) | |
1292 | { | |
1293 | int ret = 0; | |
1294 | int name_len; | |
1295 | unsigned int nlink = 0; | |
1296 | u32 item_size; | |
1297 | u32 cur_offset = 0; | |
1298 | u64 inode_objectid = btrfs_ino(inode); | |
1299 | u64 offset = 0; | |
1300 | unsigned long ptr; | |
1301 | struct btrfs_inode_extref *extref; | |
1302 | struct extent_buffer *leaf; | |
1303 | ||
1304 | while (1) { | |
1305 | ret = btrfs_find_one_extref(root, inode_objectid, offset, path, | |
1306 | &extref, &offset); | |
1307 | if (ret) | |
1308 | break; | |
c71bf099 | 1309 | |
f186373f MF |
1310 | leaf = path->nodes[0]; |
1311 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1312 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
2c2c452b | 1313 | cur_offset = 0; |
f186373f MF |
1314 | |
1315 | while (cur_offset < item_size) { | |
1316 | extref = (struct btrfs_inode_extref *) (ptr + cur_offset); | |
1317 | name_len = btrfs_inode_extref_name_len(leaf, extref); | |
1318 | ||
1319 | nlink++; | |
1320 | ||
1321 | cur_offset += name_len + sizeof(*extref); | |
1322 | } | |
1323 | ||
1324 | offset++; | |
1325 | btrfs_release_path(path); | |
1326 | } | |
1327 | btrfs_release_path(path); | |
1328 | ||
2c2c452b | 1329 | if (ret < 0 && ret != -ENOENT) |
f186373f MF |
1330 | return ret; |
1331 | return nlink; | |
1332 | } | |
1333 | ||
1334 | static int count_inode_refs(struct btrfs_root *root, | |
1335 | struct inode *inode, struct btrfs_path *path) | |
e02119d5 | 1336 | { |
e02119d5 CM |
1337 | int ret; |
1338 | struct btrfs_key key; | |
f186373f | 1339 | unsigned int nlink = 0; |
e02119d5 CM |
1340 | unsigned long ptr; |
1341 | unsigned long ptr_end; | |
1342 | int name_len; | |
33345d01 | 1343 | u64 ino = btrfs_ino(inode); |
e02119d5 | 1344 | |
33345d01 | 1345 | key.objectid = ino; |
e02119d5 CM |
1346 | key.type = BTRFS_INODE_REF_KEY; |
1347 | key.offset = (u64)-1; | |
1348 | ||
d397712b | 1349 | while (1) { |
e02119d5 CM |
1350 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1351 | if (ret < 0) | |
1352 | break; | |
1353 | if (ret > 0) { | |
1354 | if (path->slots[0] == 0) | |
1355 | break; | |
1356 | path->slots[0]--; | |
1357 | } | |
e93ae26f | 1358 | process_slot: |
e02119d5 CM |
1359 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
1360 | path->slots[0]); | |
33345d01 | 1361 | if (key.objectid != ino || |
e02119d5 CM |
1362 | key.type != BTRFS_INODE_REF_KEY) |
1363 | break; | |
1364 | ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); | |
1365 | ptr_end = ptr + btrfs_item_size_nr(path->nodes[0], | |
1366 | path->slots[0]); | |
d397712b | 1367 | while (ptr < ptr_end) { |
e02119d5 CM |
1368 | struct btrfs_inode_ref *ref; |
1369 | ||
1370 | ref = (struct btrfs_inode_ref *)ptr; | |
1371 | name_len = btrfs_inode_ref_name_len(path->nodes[0], | |
1372 | ref); | |
1373 | ptr = (unsigned long)(ref + 1) + name_len; | |
1374 | nlink++; | |
1375 | } | |
1376 | ||
1377 | if (key.offset == 0) | |
1378 | break; | |
e93ae26f FDBM |
1379 | if (path->slots[0] > 0) { |
1380 | path->slots[0]--; | |
1381 | goto process_slot; | |
1382 | } | |
e02119d5 | 1383 | key.offset--; |
b3b4aa74 | 1384 | btrfs_release_path(path); |
e02119d5 | 1385 | } |
b3b4aa74 | 1386 | btrfs_release_path(path); |
f186373f MF |
1387 | |
1388 | return nlink; | |
1389 | } | |
1390 | ||
1391 | /* | |
1392 | * There are a few corners where the link count of the file can't | |
1393 | * be properly maintained during replay. So, instead of adding | |
1394 | * lots of complexity to the log code, we just scan the backrefs | |
1395 | * for any file that has been through replay. | |
1396 | * | |
1397 | * The scan will update the link count on the inode to reflect the | |
1398 | * number of back refs found. If it goes down to zero, the iput | |
1399 | * will free the inode. | |
1400 | */ | |
1401 | static noinline int fixup_inode_link_count(struct btrfs_trans_handle *trans, | |
1402 | struct btrfs_root *root, | |
1403 | struct inode *inode) | |
1404 | { | |
1405 | struct btrfs_path *path; | |
1406 | int ret; | |
1407 | u64 nlink = 0; | |
1408 | u64 ino = btrfs_ino(inode); | |
1409 | ||
1410 | path = btrfs_alloc_path(); | |
1411 | if (!path) | |
1412 | return -ENOMEM; | |
1413 | ||
1414 | ret = count_inode_refs(root, inode, path); | |
1415 | if (ret < 0) | |
1416 | goto out; | |
1417 | ||
1418 | nlink = ret; | |
1419 | ||
1420 | ret = count_inode_extrefs(root, inode, path); | |
f186373f MF |
1421 | if (ret < 0) |
1422 | goto out; | |
1423 | ||
1424 | nlink += ret; | |
1425 | ||
1426 | ret = 0; | |
1427 | ||
e02119d5 | 1428 | if (nlink != inode->i_nlink) { |
bfe86848 | 1429 | set_nlink(inode, nlink); |
e02119d5 CM |
1430 | btrfs_update_inode(trans, root, inode); |
1431 | } | |
8d5bf1cb | 1432 | BTRFS_I(inode)->index_cnt = (u64)-1; |
e02119d5 | 1433 | |
c71bf099 YZ |
1434 | if (inode->i_nlink == 0) { |
1435 | if (S_ISDIR(inode->i_mode)) { | |
1436 | ret = replay_dir_deletes(trans, root, NULL, path, | |
33345d01 | 1437 | ino, 1); |
3650860b JB |
1438 | if (ret) |
1439 | goto out; | |
c71bf099 | 1440 | } |
33345d01 | 1441 | ret = insert_orphan_item(trans, root, ino); |
12fcfd22 | 1442 | } |
12fcfd22 | 1443 | |
f186373f MF |
1444 | out: |
1445 | btrfs_free_path(path); | |
1446 | return ret; | |
e02119d5 CM |
1447 | } |
1448 | ||
1449 | static noinline int fixup_inode_link_counts(struct btrfs_trans_handle *trans, | |
1450 | struct btrfs_root *root, | |
1451 | struct btrfs_path *path) | |
1452 | { | |
1453 | int ret; | |
1454 | struct btrfs_key key; | |
1455 | struct inode *inode; | |
1456 | ||
1457 | key.objectid = BTRFS_TREE_LOG_FIXUP_OBJECTID; | |
1458 | key.type = BTRFS_ORPHAN_ITEM_KEY; | |
1459 | key.offset = (u64)-1; | |
d397712b | 1460 | while (1) { |
e02119d5 CM |
1461 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1462 | if (ret < 0) | |
1463 | break; | |
1464 | ||
1465 | if (ret == 1) { | |
1466 | if (path->slots[0] == 0) | |
1467 | break; | |
1468 | path->slots[0]--; | |
1469 | } | |
1470 | ||
1471 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1472 | if (key.objectid != BTRFS_TREE_LOG_FIXUP_OBJECTID || | |
1473 | key.type != BTRFS_ORPHAN_ITEM_KEY) | |
1474 | break; | |
1475 | ||
1476 | ret = btrfs_del_item(trans, root, path); | |
65a246c5 TI |
1477 | if (ret) |
1478 | goto out; | |
e02119d5 | 1479 | |
b3b4aa74 | 1480 | btrfs_release_path(path); |
e02119d5 | 1481 | inode = read_one_inode(root, key.offset); |
c00e9493 TI |
1482 | if (!inode) |
1483 | return -EIO; | |
e02119d5 CM |
1484 | |
1485 | ret = fixup_inode_link_count(trans, root, inode); | |
e02119d5 | 1486 | iput(inode); |
3650860b JB |
1487 | if (ret) |
1488 | goto out; | |
e02119d5 | 1489 | |
12fcfd22 CM |
1490 | /* |
1491 | * fixup on a directory may create new entries, | |
1492 | * make sure we always look for the highset possible | |
1493 | * offset | |
1494 | */ | |
1495 | key.offset = (u64)-1; | |
e02119d5 | 1496 | } |
65a246c5 TI |
1497 | ret = 0; |
1498 | out: | |
b3b4aa74 | 1499 | btrfs_release_path(path); |
65a246c5 | 1500 | return ret; |
e02119d5 CM |
1501 | } |
1502 | ||
1503 | ||
1504 | /* | |
1505 | * record a given inode in the fixup dir so we can check its link | |
1506 | * count when replay is done. The link count is incremented here | |
1507 | * so the inode won't go away until we check it | |
1508 | */ | |
1509 | static noinline int link_to_fixup_dir(struct btrfs_trans_handle *trans, | |
1510 | struct btrfs_root *root, | |
1511 | struct btrfs_path *path, | |
1512 | u64 objectid) | |
1513 | { | |
1514 | struct btrfs_key key; | |
1515 | int ret = 0; | |
1516 | struct inode *inode; | |
1517 | ||
1518 | inode = read_one_inode(root, objectid); | |
c00e9493 TI |
1519 | if (!inode) |
1520 | return -EIO; | |
e02119d5 CM |
1521 | |
1522 | key.objectid = BTRFS_TREE_LOG_FIXUP_OBJECTID; | |
962a298f | 1523 | key.type = BTRFS_ORPHAN_ITEM_KEY; |
e02119d5 CM |
1524 | key.offset = objectid; |
1525 | ||
1526 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
1527 | ||
b3b4aa74 | 1528 | btrfs_release_path(path); |
e02119d5 | 1529 | if (ret == 0) { |
9bf7a489 JB |
1530 | if (!inode->i_nlink) |
1531 | set_nlink(inode, 1); | |
1532 | else | |
8b558c5f | 1533 | inc_nlink(inode); |
b9959295 | 1534 | ret = btrfs_update_inode(trans, root, inode); |
e02119d5 CM |
1535 | } else if (ret == -EEXIST) { |
1536 | ret = 0; | |
1537 | } else { | |
3650860b | 1538 | BUG(); /* Logic Error */ |
e02119d5 CM |
1539 | } |
1540 | iput(inode); | |
1541 | ||
1542 | return ret; | |
1543 | } | |
1544 | ||
1545 | /* | |
1546 | * when replaying the log for a directory, we only insert names | |
1547 | * for inodes that actually exist. This means an fsync on a directory | |
1548 | * does not implicitly fsync all the new files in it | |
1549 | */ | |
1550 | static noinline int insert_one_name(struct btrfs_trans_handle *trans, | |
1551 | struct btrfs_root *root, | |
1552 | struct btrfs_path *path, | |
1553 | u64 dirid, u64 index, | |
1554 | char *name, int name_len, u8 type, | |
1555 | struct btrfs_key *location) | |
1556 | { | |
1557 | struct inode *inode; | |
1558 | struct inode *dir; | |
1559 | int ret; | |
1560 | ||
1561 | inode = read_one_inode(root, location->objectid); | |
1562 | if (!inode) | |
1563 | return -ENOENT; | |
1564 | ||
1565 | dir = read_one_inode(root, dirid); | |
1566 | if (!dir) { | |
1567 | iput(inode); | |
1568 | return -EIO; | |
1569 | } | |
d555438b | 1570 | |
e02119d5 CM |
1571 | ret = btrfs_add_link(trans, dir, inode, name, name_len, 1, index); |
1572 | ||
1573 | /* FIXME, put inode into FIXUP list */ | |
1574 | ||
1575 | iput(inode); | |
1576 | iput(dir); | |
1577 | return ret; | |
1578 | } | |
1579 | ||
df8d116f FM |
1580 | /* |
1581 | * Return true if an inode reference exists in the log for the given name, | |
1582 | * inode and parent inode. | |
1583 | */ | |
1584 | static bool name_in_log_ref(struct btrfs_root *log_root, | |
1585 | const char *name, const int name_len, | |
1586 | const u64 dirid, const u64 ino) | |
1587 | { | |
1588 | struct btrfs_key search_key; | |
1589 | ||
1590 | search_key.objectid = ino; | |
1591 | search_key.type = BTRFS_INODE_REF_KEY; | |
1592 | search_key.offset = dirid; | |
1593 | if (backref_in_log(log_root, &search_key, dirid, name, name_len)) | |
1594 | return true; | |
1595 | ||
1596 | search_key.type = BTRFS_INODE_EXTREF_KEY; | |
1597 | search_key.offset = btrfs_extref_hash(dirid, name, name_len); | |
1598 | if (backref_in_log(log_root, &search_key, dirid, name, name_len)) | |
1599 | return true; | |
1600 | ||
1601 | return false; | |
1602 | } | |
1603 | ||
e02119d5 CM |
1604 | /* |
1605 | * take a single entry in a log directory item and replay it into | |
1606 | * the subvolume. | |
1607 | * | |
1608 | * if a conflicting item exists in the subdirectory already, | |
1609 | * the inode it points to is unlinked and put into the link count | |
1610 | * fix up tree. | |
1611 | * | |
1612 | * If a name from the log points to a file or directory that does | |
1613 | * not exist in the FS, it is skipped. fsyncs on directories | |
1614 | * do not force down inodes inside that directory, just changes to the | |
1615 | * names or unlinks in a directory. | |
1616 | */ | |
1617 | static noinline int replay_one_name(struct btrfs_trans_handle *trans, | |
1618 | struct btrfs_root *root, | |
1619 | struct btrfs_path *path, | |
1620 | struct extent_buffer *eb, | |
1621 | struct btrfs_dir_item *di, | |
1622 | struct btrfs_key *key) | |
1623 | { | |
1624 | char *name; | |
1625 | int name_len; | |
1626 | struct btrfs_dir_item *dst_di; | |
1627 | struct btrfs_key found_key; | |
1628 | struct btrfs_key log_key; | |
1629 | struct inode *dir; | |
e02119d5 | 1630 | u8 log_type; |
4bef0848 | 1631 | int exists; |
3650860b | 1632 | int ret = 0; |
d555438b | 1633 | bool update_size = (key->type == BTRFS_DIR_INDEX_KEY); |
e02119d5 CM |
1634 | |
1635 | dir = read_one_inode(root, key->objectid); | |
c00e9493 TI |
1636 | if (!dir) |
1637 | return -EIO; | |
e02119d5 CM |
1638 | |
1639 | name_len = btrfs_dir_name_len(eb, di); | |
1640 | name = kmalloc(name_len, GFP_NOFS); | |
2bac325e FDBM |
1641 | if (!name) { |
1642 | ret = -ENOMEM; | |
1643 | goto out; | |
1644 | } | |
2a29edc6 | 1645 | |
e02119d5 CM |
1646 | log_type = btrfs_dir_type(eb, di); |
1647 | read_extent_buffer(eb, name, (unsigned long)(di + 1), | |
1648 | name_len); | |
1649 | ||
1650 | btrfs_dir_item_key_to_cpu(eb, di, &log_key); | |
4bef0848 CM |
1651 | exists = btrfs_lookup_inode(trans, root, path, &log_key, 0); |
1652 | if (exists == 0) | |
1653 | exists = 1; | |
1654 | else | |
1655 | exists = 0; | |
b3b4aa74 | 1656 | btrfs_release_path(path); |
4bef0848 | 1657 | |
e02119d5 CM |
1658 | if (key->type == BTRFS_DIR_ITEM_KEY) { |
1659 | dst_di = btrfs_lookup_dir_item(trans, root, path, key->objectid, | |
1660 | name, name_len, 1); | |
d397712b | 1661 | } else if (key->type == BTRFS_DIR_INDEX_KEY) { |
e02119d5 CM |
1662 | dst_di = btrfs_lookup_dir_index_item(trans, root, path, |
1663 | key->objectid, | |
1664 | key->offset, name, | |
1665 | name_len, 1); | |
1666 | } else { | |
3650860b JB |
1667 | /* Corruption */ |
1668 | ret = -EINVAL; | |
1669 | goto out; | |
e02119d5 | 1670 | } |
c704005d | 1671 | if (IS_ERR_OR_NULL(dst_di)) { |
e02119d5 CM |
1672 | /* we need a sequence number to insert, so we only |
1673 | * do inserts for the BTRFS_DIR_INDEX_KEY types | |
1674 | */ | |
1675 | if (key->type != BTRFS_DIR_INDEX_KEY) | |
1676 | goto out; | |
1677 | goto insert; | |
1678 | } | |
1679 | ||
1680 | btrfs_dir_item_key_to_cpu(path->nodes[0], dst_di, &found_key); | |
1681 | /* the existing item matches the logged item */ | |
1682 | if (found_key.objectid == log_key.objectid && | |
1683 | found_key.type == log_key.type && | |
1684 | found_key.offset == log_key.offset && | |
1685 | btrfs_dir_type(path->nodes[0], dst_di) == log_type) { | |
a2cc11db | 1686 | update_size = false; |
e02119d5 CM |
1687 | goto out; |
1688 | } | |
1689 | ||
1690 | /* | |
1691 | * don't drop the conflicting directory entry if the inode | |
1692 | * for the new entry doesn't exist | |
1693 | */ | |
4bef0848 | 1694 | if (!exists) |
e02119d5 CM |
1695 | goto out; |
1696 | ||
e02119d5 | 1697 | ret = drop_one_dir_item(trans, root, path, dir, dst_di); |
3650860b JB |
1698 | if (ret) |
1699 | goto out; | |
e02119d5 CM |
1700 | |
1701 | if (key->type == BTRFS_DIR_INDEX_KEY) | |
1702 | goto insert; | |
1703 | out: | |
b3b4aa74 | 1704 | btrfs_release_path(path); |
d555438b JB |
1705 | if (!ret && update_size) { |
1706 | btrfs_i_size_write(dir, dir->i_size + name_len * 2); | |
1707 | ret = btrfs_update_inode(trans, root, dir); | |
1708 | } | |
e02119d5 CM |
1709 | kfree(name); |
1710 | iput(dir); | |
3650860b | 1711 | return ret; |
e02119d5 CM |
1712 | |
1713 | insert: | |
df8d116f FM |
1714 | if (name_in_log_ref(root->log_root, name, name_len, |
1715 | key->objectid, log_key.objectid)) { | |
1716 | /* The dentry will be added later. */ | |
1717 | ret = 0; | |
1718 | update_size = false; | |
1719 | goto out; | |
1720 | } | |
b3b4aa74 | 1721 | btrfs_release_path(path); |
e02119d5 CM |
1722 | ret = insert_one_name(trans, root, path, key->objectid, key->offset, |
1723 | name, name_len, log_type, &log_key); | |
df8d116f | 1724 | if (ret && ret != -ENOENT && ret != -EEXIST) |
3650860b | 1725 | goto out; |
d555438b | 1726 | update_size = false; |
3650860b | 1727 | ret = 0; |
e02119d5 CM |
1728 | goto out; |
1729 | } | |
1730 | ||
1731 | /* | |
1732 | * find all the names in a directory item and reconcile them into | |
1733 | * the subvolume. Only BTRFS_DIR_ITEM_KEY types will have more than | |
1734 | * one name in a directory item, but the same code gets used for | |
1735 | * both directory index types | |
1736 | */ | |
1737 | static noinline int replay_one_dir_item(struct btrfs_trans_handle *trans, | |
1738 | struct btrfs_root *root, | |
1739 | struct btrfs_path *path, | |
1740 | struct extent_buffer *eb, int slot, | |
1741 | struct btrfs_key *key) | |
1742 | { | |
1743 | int ret; | |
1744 | u32 item_size = btrfs_item_size_nr(eb, slot); | |
1745 | struct btrfs_dir_item *di; | |
1746 | int name_len; | |
1747 | unsigned long ptr; | |
1748 | unsigned long ptr_end; | |
1749 | ||
1750 | ptr = btrfs_item_ptr_offset(eb, slot); | |
1751 | ptr_end = ptr + item_size; | |
d397712b | 1752 | while (ptr < ptr_end) { |
e02119d5 | 1753 | di = (struct btrfs_dir_item *)ptr; |
22a94d44 JB |
1754 | if (verify_dir_item(root, eb, di)) |
1755 | return -EIO; | |
e02119d5 CM |
1756 | name_len = btrfs_dir_name_len(eb, di); |
1757 | ret = replay_one_name(trans, root, path, eb, di, key); | |
3650860b JB |
1758 | if (ret) |
1759 | return ret; | |
e02119d5 CM |
1760 | ptr = (unsigned long)(di + 1); |
1761 | ptr += name_len; | |
1762 | } | |
1763 | return 0; | |
1764 | } | |
1765 | ||
1766 | /* | |
1767 | * directory replay has two parts. There are the standard directory | |
1768 | * items in the log copied from the subvolume, and range items | |
1769 | * created in the log while the subvolume was logged. | |
1770 | * | |
1771 | * The range items tell us which parts of the key space the log | |
1772 | * is authoritative for. During replay, if a key in the subvolume | |
1773 | * directory is in a logged range item, but not actually in the log | |
1774 | * that means it was deleted from the directory before the fsync | |
1775 | * and should be removed. | |
1776 | */ | |
1777 | static noinline int find_dir_range(struct btrfs_root *root, | |
1778 | struct btrfs_path *path, | |
1779 | u64 dirid, int key_type, | |
1780 | u64 *start_ret, u64 *end_ret) | |
1781 | { | |
1782 | struct btrfs_key key; | |
1783 | u64 found_end; | |
1784 | struct btrfs_dir_log_item *item; | |
1785 | int ret; | |
1786 | int nritems; | |
1787 | ||
1788 | if (*start_ret == (u64)-1) | |
1789 | return 1; | |
1790 | ||
1791 | key.objectid = dirid; | |
1792 | key.type = key_type; | |
1793 | key.offset = *start_ret; | |
1794 | ||
1795 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1796 | if (ret < 0) | |
1797 | goto out; | |
1798 | if (ret > 0) { | |
1799 | if (path->slots[0] == 0) | |
1800 | goto out; | |
1801 | path->slots[0]--; | |
1802 | } | |
1803 | if (ret != 0) | |
1804 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1805 | ||
1806 | if (key.type != key_type || key.objectid != dirid) { | |
1807 | ret = 1; | |
1808 | goto next; | |
1809 | } | |
1810 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1811 | struct btrfs_dir_log_item); | |
1812 | found_end = btrfs_dir_log_end(path->nodes[0], item); | |
1813 | ||
1814 | if (*start_ret >= key.offset && *start_ret <= found_end) { | |
1815 | ret = 0; | |
1816 | *start_ret = key.offset; | |
1817 | *end_ret = found_end; | |
1818 | goto out; | |
1819 | } | |
1820 | ret = 1; | |
1821 | next: | |
1822 | /* check the next slot in the tree to see if it is a valid item */ | |
1823 | nritems = btrfs_header_nritems(path->nodes[0]); | |
1824 | if (path->slots[0] >= nritems) { | |
1825 | ret = btrfs_next_leaf(root, path); | |
1826 | if (ret) | |
1827 | goto out; | |
1828 | } else { | |
1829 | path->slots[0]++; | |
1830 | } | |
1831 | ||
1832 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1833 | ||
1834 | if (key.type != key_type || key.objectid != dirid) { | |
1835 | ret = 1; | |
1836 | goto out; | |
1837 | } | |
1838 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1839 | struct btrfs_dir_log_item); | |
1840 | found_end = btrfs_dir_log_end(path->nodes[0], item); | |
1841 | *start_ret = key.offset; | |
1842 | *end_ret = found_end; | |
1843 | ret = 0; | |
1844 | out: | |
b3b4aa74 | 1845 | btrfs_release_path(path); |
e02119d5 CM |
1846 | return ret; |
1847 | } | |
1848 | ||
1849 | /* | |
1850 | * this looks for a given directory item in the log. If the directory | |
1851 | * item is not in the log, the item is removed and the inode it points | |
1852 | * to is unlinked | |
1853 | */ | |
1854 | static noinline int check_item_in_log(struct btrfs_trans_handle *trans, | |
1855 | struct btrfs_root *root, | |
1856 | struct btrfs_root *log, | |
1857 | struct btrfs_path *path, | |
1858 | struct btrfs_path *log_path, | |
1859 | struct inode *dir, | |
1860 | struct btrfs_key *dir_key) | |
1861 | { | |
1862 | int ret; | |
1863 | struct extent_buffer *eb; | |
1864 | int slot; | |
1865 | u32 item_size; | |
1866 | struct btrfs_dir_item *di; | |
1867 | struct btrfs_dir_item *log_di; | |
1868 | int name_len; | |
1869 | unsigned long ptr; | |
1870 | unsigned long ptr_end; | |
1871 | char *name; | |
1872 | struct inode *inode; | |
1873 | struct btrfs_key location; | |
1874 | ||
1875 | again: | |
1876 | eb = path->nodes[0]; | |
1877 | slot = path->slots[0]; | |
1878 | item_size = btrfs_item_size_nr(eb, slot); | |
1879 | ptr = btrfs_item_ptr_offset(eb, slot); | |
1880 | ptr_end = ptr + item_size; | |
d397712b | 1881 | while (ptr < ptr_end) { |
e02119d5 | 1882 | di = (struct btrfs_dir_item *)ptr; |
22a94d44 JB |
1883 | if (verify_dir_item(root, eb, di)) { |
1884 | ret = -EIO; | |
1885 | goto out; | |
1886 | } | |
1887 | ||
e02119d5 CM |
1888 | name_len = btrfs_dir_name_len(eb, di); |
1889 | name = kmalloc(name_len, GFP_NOFS); | |
1890 | if (!name) { | |
1891 | ret = -ENOMEM; | |
1892 | goto out; | |
1893 | } | |
1894 | read_extent_buffer(eb, name, (unsigned long)(di + 1), | |
1895 | name_len); | |
1896 | log_di = NULL; | |
12fcfd22 | 1897 | if (log && dir_key->type == BTRFS_DIR_ITEM_KEY) { |
e02119d5 CM |
1898 | log_di = btrfs_lookup_dir_item(trans, log, log_path, |
1899 | dir_key->objectid, | |
1900 | name, name_len, 0); | |
12fcfd22 | 1901 | } else if (log && dir_key->type == BTRFS_DIR_INDEX_KEY) { |
e02119d5 CM |
1902 | log_di = btrfs_lookup_dir_index_item(trans, log, |
1903 | log_path, | |
1904 | dir_key->objectid, | |
1905 | dir_key->offset, | |
1906 | name, name_len, 0); | |
1907 | } | |
269d040f | 1908 | if (!log_di || (IS_ERR(log_di) && PTR_ERR(log_di) == -ENOENT)) { |
e02119d5 | 1909 | btrfs_dir_item_key_to_cpu(eb, di, &location); |
b3b4aa74 DS |
1910 | btrfs_release_path(path); |
1911 | btrfs_release_path(log_path); | |
e02119d5 | 1912 | inode = read_one_inode(root, location.objectid); |
c00e9493 TI |
1913 | if (!inode) { |
1914 | kfree(name); | |
1915 | return -EIO; | |
1916 | } | |
e02119d5 CM |
1917 | |
1918 | ret = link_to_fixup_dir(trans, root, | |
1919 | path, location.objectid); | |
3650860b JB |
1920 | if (ret) { |
1921 | kfree(name); | |
1922 | iput(inode); | |
1923 | goto out; | |
1924 | } | |
1925 | ||
8b558c5f | 1926 | inc_nlink(inode); |
e02119d5 CM |
1927 | ret = btrfs_unlink_inode(trans, root, dir, inode, |
1928 | name, name_len); | |
3650860b | 1929 | if (!ret) |
ada9af21 | 1930 | ret = btrfs_run_delayed_items(trans, root); |
e02119d5 CM |
1931 | kfree(name); |
1932 | iput(inode); | |
3650860b JB |
1933 | if (ret) |
1934 | goto out; | |
e02119d5 CM |
1935 | |
1936 | /* there might still be more names under this key | |
1937 | * check and repeat if required | |
1938 | */ | |
1939 | ret = btrfs_search_slot(NULL, root, dir_key, path, | |
1940 | 0, 0); | |
1941 | if (ret == 0) | |
1942 | goto again; | |
1943 | ret = 0; | |
1944 | goto out; | |
269d040f FDBM |
1945 | } else if (IS_ERR(log_di)) { |
1946 | kfree(name); | |
1947 | return PTR_ERR(log_di); | |
e02119d5 | 1948 | } |
b3b4aa74 | 1949 | btrfs_release_path(log_path); |
e02119d5 CM |
1950 | kfree(name); |
1951 | ||
1952 | ptr = (unsigned long)(di + 1); | |
1953 | ptr += name_len; | |
1954 | } | |
1955 | ret = 0; | |
1956 | out: | |
b3b4aa74 DS |
1957 | btrfs_release_path(path); |
1958 | btrfs_release_path(log_path); | |
e02119d5 CM |
1959 | return ret; |
1960 | } | |
1961 | ||
4f764e51 FM |
1962 | static int replay_xattr_deletes(struct btrfs_trans_handle *trans, |
1963 | struct btrfs_root *root, | |
1964 | struct btrfs_root *log, | |
1965 | struct btrfs_path *path, | |
1966 | const u64 ino) | |
1967 | { | |
1968 | struct btrfs_key search_key; | |
1969 | struct btrfs_path *log_path; | |
1970 | int i; | |
1971 | int nritems; | |
1972 | int ret; | |
1973 | ||
1974 | log_path = btrfs_alloc_path(); | |
1975 | if (!log_path) | |
1976 | return -ENOMEM; | |
1977 | ||
1978 | search_key.objectid = ino; | |
1979 | search_key.type = BTRFS_XATTR_ITEM_KEY; | |
1980 | search_key.offset = 0; | |
1981 | again: | |
1982 | ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0); | |
1983 | if (ret < 0) | |
1984 | goto out; | |
1985 | process_leaf: | |
1986 | nritems = btrfs_header_nritems(path->nodes[0]); | |
1987 | for (i = path->slots[0]; i < nritems; i++) { | |
1988 | struct btrfs_key key; | |
1989 | struct btrfs_dir_item *di; | |
1990 | struct btrfs_dir_item *log_di; | |
1991 | u32 total_size; | |
1992 | u32 cur; | |
1993 | ||
1994 | btrfs_item_key_to_cpu(path->nodes[0], &key, i); | |
1995 | if (key.objectid != ino || key.type != BTRFS_XATTR_ITEM_KEY) { | |
1996 | ret = 0; | |
1997 | goto out; | |
1998 | } | |
1999 | ||
2000 | di = btrfs_item_ptr(path->nodes[0], i, struct btrfs_dir_item); | |
2001 | total_size = btrfs_item_size_nr(path->nodes[0], i); | |
2002 | cur = 0; | |
2003 | while (cur < total_size) { | |
2004 | u16 name_len = btrfs_dir_name_len(path->nodes[0], di); | |
2005 | u16 data_len = btrfs_dir_data_len(path->nodes[0], di); | |
2006 | u32 this_len = sizeof(*di) + name_len + data_len; | |
2007 | char *name; | |
2008 | ||
2009 | name = kmalloc(name_len, GFP_NOFS); | |
2010 | if (!name) { | |
2011 | ret = -ENOMEM; | |
2012 | goto out; | |
2013 | } | |
2014 | read_extent_buffer(path->nodes[0], name, | |
2015 | (unsigned long)(di + 1), name_len); | |
2016 | ||
2017 | log_di = btrfs_lookup_xattr(NULL, log, log_path, ino, | |
2018 | name, name_len, 0); | |
2019 | btrfs_release_path(log_path); | |
2020 | if (!log_di) { | |
2021 | /* Doesn't exist in log tree, so delete it. */ | |
2022 | btrfs_release_path(path); | |
2023 | di = btrfs_lookup_xattr(trans, root, path, ino, | |
2024 | name, name_len, -1); | |
2025 | kfree(name); | |
2026 | if (IS_ERR(di)) { | |
2027 | ret = PTR_ERR(di); | |
2028 | goto out; | |
2029 | } | |
2030 | ASSERT(di); | |
2031 | ret = btrfs_delete_one_dir_name(trans, root, | |
2032 | path, di); | |
2033 | if (ret) | |
2034 | goto out; | |
2035 | btrfs_release_path(path); | |
2036 | search_key = key; | |
2037 | goto again; | |
2038 | } | |
2039 | kfree(name); | |
2040 | if (IS_ERR(log_di)) { | |
2041 | ret = PTR_ERR(log_di); | |
2042 | goto out; | |
2043 | } | |
2044 | cur += this_len; | |
2045 | di = (struct btrfs_dir_item *)((char *)di + this_len); | |
2046 | } | |
2047 | } | |
2048 | ret = btrfs_next_leaf(root, path); | |
2049 | if (ret > 0) | |
2050 | ret = 0; | |
2051 | else if (ret == 0) | |
2052 | goto process_leaf; | |
2053 | out: | |
2054 | btrfs_free_path(log_path); | |
2055 | btrfs_release_path(path); | |
2056 | return ret; | |
2057 | } | |
2058 | ||
2059 | ||
e02119d5 CM |
2060 | /* |
2061 | * deletion replay happens before we copy any new directory items | |
2062 | * out of the log or out of backreferences from inodes. It | |
2063 | * scans the log to find ranges of keys that log is authoritative for, | |
2064 | * and then scans the directory to find items in those ranges that are | |
2065 | * not present in the log. | |
2066 | * | |
2067 | * Anything we don't find in the log is unlinked and removed from the | |
2068 | * directory. | |
2069 | */ | |
2070 | static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, | |
2071 | struct btrfs_root *root, | |
2072 | struct btrfs_root *log, | |
2073 | struct btrfs_path *path, | |
12fcfd22 | 2074 | u64 dirid, int del_all) |
e02119d5 CM |
2075 | { |
2076 | u64 range_start; | |
2077 | u64 range_end; | |
2078 | int key_type = BTRFS_DIR_LOG_ITEM_KEY; | |
2079 | int ret = 0; | |
2080 | struct btrfs_key dir_key; | |
2081 | struct btrfs_key found_key; | |
2082 | struct btrfs_path *log_path; | |
2083 | struct inode *dir; | |
2084 | ||
2085 | dir_key.objectid = dirid; | |
2086 | dir_key.type = BTRFS_DIR_ITEM_KEY; | |
2087 | log_path = btrfs_alloc_path(); | |
2088 | if (!log_path) | |
2089 | return -ENOMEM; | |
2090 | ||
2091 | dir = read_one_inode(root, dirid); | |
2092 | /* it isn't an error if the inode isn't there, that can happen | |
2093 | * because we replay the deletes before we copy in the inode item | |
2094 | * from the log | |
2095 | */ | |
2096 | if (!dir) { | |
2097 | btrfs_free_path(log_path); | |
2098 | return 0; | |
2099 | } | |
2100 | again: | |
2101 | range_start = 0; | |
2102 | range_end = 0; | |
d397712b | 2103 | while (1) { |
12fcfd22 CM |
2104 | if (del_all) |
2105 | range_end = (u64)-1; | |
2106 | else { | |
2107 | ret = find_dir_range(log, path, dirid, key_type, | |
2108 | &range_start, &range_end); | |
2109 | if (ret != 0) | |
2110 | break; | |
2111 | } | |
e02119d5 CM |
2112 | |
2113 | dir_key.offset = range_start; | |
d397712b | 2114 | while (1) { |
e02119d5 CM |
2115 | int nritems; |
2116 | ret = btrfs_search_slot(NULL, root, &dir_key, path, | |
2117 | 0, 0); | |
2118 | if (ret < 0) | |
2119 | goto out; | |
2120 | ||
2121 | nritems = btrfs_header_nritems(path->nodes[0]); | |
2122 | if (path->slots[0] >= nritems) { | |
2123 | ret = btrfs_next_leaf(root, path); | |
2124 | if (ret) | |
2125 | break; | |
2126 | } | |
2127 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
2128 | path->slots[0]); | |
2129 | if (found_key.objectid != dirid || | |
2130 | found_key.type != dir_key.type) | |
2131 | goto next_type; | |
2132 | ||
2133 | if (found_key.offset > range_end) | |
2134 | break; | |
2135 | ||
2136 | ret = check_item_in_log(trans, root, log, path, | |
12fcfd22 CM |
2137 | log_path, dir, |
2138 | &found_key); | |
3650860b JB |
2139 | if (ret) |
2140 | goto out; | |
e02119d5 CM |
2141 | if (found_key.offset == (u64)-1) |
2142 | break; | |
2143 | dir_key.offset = found_key.offset + 1; | |
2144 | } | |
b3b4aa74 | 2145 | btrfs_release_path(path); |
e02119d5 CM |
2146 | if (range_end == (u64)-1) |
2147 | break; | |
2148 | range_start = range_end + 1; | |
2149 | } | |
2150 | ||
2151 | next_type: | |
2152 | ret = 0; | |
2153 | if (key_type == BTRFS_DIR_LOG_ITEM_KEY) { | |
2154 | key_type = BTRFS_DIR_LOG_INDEX_KEY; | |
2155 | dir_key.type = BTRFS_DIR_INDEX_KEY; | |
b3b4aa74 | 2156 | btrfs_release_path(path); |
e02119d5 CM |
2157 | goto again; |
2158 | } | |
2159 | out: | |
b3b4aa74 | 2160 | btrfs_release_path(path); |
e02119d5 CM |
2161 | btrfs_free_path(log_path); |
2162 | iput(dir); | |
2163 | return ret; | |
2164 | } | |
2165 | ||
2166 | /* | |
2167 | * the process_func used to replay items from the log tree. This | |
2168 | * gets called in two different stages. The first stage just looks | |
2169 | * for inodes and makes sure they are all copied into the subvolume. | |
2170 | * | |
2171 | * The second stage copies all the other item types from the log into | |
2172 | * the subvolume. The two stage approach is slower, but gets rid of | |
2173 | * lots of complexity around inodes referencing other inodes that exist | |
2174 | * only in the log (references come from either directory items or inode | |
2175 | * back refs). | |
2176 | */ | |
2177 | static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb, | |
2178 | struct walk_control *wc, u64 gen) | |
2179 | { | |
2180 | int nritems; | |
2181 | struct btrfs_path *path; | |
2182 | struct btrfs_root *root = wc->replay_dest; | |
2183 | struct btrfs_key key; | |
e02119d5 CM |
2184 | int level; |
2185 | int i; | |
2186 | int ret; | |
2187 | ||
018642a1 TI |
2188 | ret = btrfs_read_buffer(eb, gen); |
2189 | if (ret) | |
2190 | return ret; | |
e02119d5 CM |
2191 | |
2192 | level = btrfs_header_level(eb); | |
2193 | ||
2194 | if (level != 0) | |
2195 | return 0; | |
2196 | ||
2197 | path = btrfs_alloc_path(); | |
1e5063d0 MF |
2198 | if (!path) |
2199 | return -ENOMEM; | |
e02119d5 CM |
2200 | |
2201 | nritems = btrfs_header_nritems(eb); | |
2202 | for (i = 0; i < nritems; i++) { | |
2203 | btrfs_item_key_to_cpu(eb, &key, i); | |
e02119d5 CM |
2204 | |
2205 | /* inode keys are done during the first stage */ | |
2206 | if (key.type == BTRFS_INODE_ITEM_KEY && | |
2207 | wc->stage == LOG_WALK_REPLAY_INODES) { | |
e02119d5 CM |
2208 | struct btrfs_inode_item *inode_item; |
2209 | u32 mode; | |
2210 | ||
2211 | inode_item = btrfs_item_ptr(eb, i, | |
2212 | struct btrfs_inode_item); | |
4f764e51 FM |
2213 | ret = replay_xattr_deletes(wc->trans, root, log, |
2214 | path, key.objectid); | |
2215 | if (ret) | |
2216 | break; | |
e02119d5 CM |
2217 | mode = btrfs_inode_mode(eb, inode_item); |
2218 | if (S_ISDIR(mode)) { | |
2219 | ret = replay_dir_deletes(wc->trans, | |
12fcfd22 | 2220 | root, log, path, key.objectid, 0); |
b50c6e25 JB |
2221 | if (ret) |
2222 | break; | |
e02119d5 CM |
2223 | } |
2224 | ret = overwrite_item(wc->trans, root, path, | |
2225 | eb, i, &key); | |
b50c6e25 JB |
2226 | if (ret) |
2227 | break; | |
e02119d5 | 2228 | |
c71bf099 YZ |
2229 | /* for regular files, make sure corresponding |
2230 | * orhpan item exist. extents past the new EOF | |
2231 | * will be truncated later by orphan cleanup. | |
e02119d5 CM |
2232 | */ |
2233 | if (S_ISREG(mode)) { | |
c71bf099 YZ |
2234 | ret = insert_orphan_item(wc->trans, root, |
2235 | key.objectid); | |
b50c6e25 JB |
2236 | if (ret) |
2237 | break; | |
e02119d5 | 2238 | } |
c71bf099 | 2239 | |
e02119d5 CM |
2240 | ret = link_to_fixup_dir(wc->trans, root, |
2241 | path, key.objectid); | |
b50c6e25 JB |
2242 | if (ret) |
2243 | break; | |
e02119d5 | 2244 | } |
dd8e7217 JB |
2245 | |
2246 | if (key.type == BTRFS_DIR_INDEX_KEY && | |
2247 | wc->stage == LOG_WALK_REPLAY_DIR_INDEX) { | |
2248 | ret = replay_one_dir_item(wc->trans, root, path, | |
2249 | eb, i, &key); | |
2250 | if (ret) | |
2251 | break; | |
2252 | } | |
2253 | ||
e02119d5 CM |
2254 | if (wc->stage < LOG_WALK_REPLAY_ALL) |
2255 | continue; | |
2256 | ||
2257 | /* these keys are simply copied */ | |
2258 | if (key.type == BTRFS_XATTR_ITEM_KEY) { | |
2259 | ret = overwrite_item(wc->trans, root, path, | |
2260 | eb, i, &key); | |
b50c6e25 JB |
2261 | if (ret) |
2262 | break; | |
2da1c669 LB |
2263 | } else if (key.type == BTRFS_INODE_REF_KEY || |
2264 | key.type == BTRFS_INODE_EXTREF_KEY) { | |
f186373f MF |
2265 | ret = add_inode_ref(wc->trans, root, log, path, |
2266 | eb, i, &key); | |
b50c6e25 JB |
2267 | if (ret && ret != -ENOENT) |
2268 | break; | |
2269 | ret = 0; | |
e02119d5 CM |
2270 | } else if (key.type == BTRFS_EXTENT_DATA_KEY) { |
2271 | ret = replay_one_extent(wc->trans, root, path, | |
2272 | eb, i, &key); | |
b50c6e25 JB |
2273 | if (ret) |
2274 | break; | |
dd8e7217 | 2275 | } else if (key.type == BTRFS_DIR_ITEM_KEY) { |
e02119d5 CM |
2276 | ret = replay_one_dir_item(wc->trans, root, path, |
2277 | eb, i, &key); | |
b50c6e25 JB |
2278 | if (ret) |
2279 | break; | |
e02119d5 CM |
2280 | } |
2281 | } | |
2282 | btrfs_free_path(path); | |
b50c6e25 | 2283 | return ret; |
e02119d5 CM |
2284 | } |
2285 | ||
d397712b | 2286 | static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans, |
e02119d5 CM |
2287 | struct btrfs_root *root, |
2288 | struct btrfs_path *path, int *level, | |
2289 | struct walk_control *wc) | |
2290 | { | |
2291 | u64 root_owner; | |
e02119d5 CM |
2292 | u64 bytenr; |
2293 | u64 ptr_gen; | |
2294 | struct extent_buffer *next; | |
2295 | struct extent_buffer *cur; | |
2296 | struct extent_buffer *parent; | |
2297 | u32 blocksize; | |
2298 | int ret = 0; | |
2299 | ||
2300 | WARN_ON(*level < 0); | |
2301 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
2302 | ||
d397712b | 2303 | while (*level > 0) { |
e02119d5 CM |
2304 | WARN_ON(*level < 0); |
2305 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
2306 | cur = path->nodes[*level]; | |
2307 | ||
fae7f21c | 2308 | WARN_ON(btrfs_header_level(cur) != *level); |
e02119d5 CM |
2309 | |
2310 | if (path->slots[*level] >= | |
2311 | btrfs_header_nritems(cur)) | |
2312 | break; | |
2313 | ||
2314 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); | |
2315 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); | |
707e8a07 | 2316 | blocksize = root->nodesize; |
e02119d5 CM |
2317 | |
2318 | parent = path->nodes[*level]; | |
2319 | root_owner = btrfs_header_owner(parent); | |
e02119d5 | 2320 | |
a83fffb7 | 2321 | next = btrfs_find_create_tree_block(root, bytenr); |
2a29edc6 | 2322 | if (!next) |
2323 | return -ENOMEM; | |
e02119d5 | 2324 | |
e02119d5 | 2325 | if (*level == 1) { |
1e5063d0 | 2326 | ret = wc->process_func(root, next, wc, ptr_gen); |
b50c6e25 JB |
2327 | if (ret) { |
2328 | free_extent_buffer(next); | |
1e5063d0 | 2329 | return ret; |
b50c6e25 | 2330 | } |
4a500fd1 | 2331 | |
e02119d5 CM |
2332 | path->slots[*level]++; |
2333 | if (wc->free) { | |
018642a1 TI |
2334 | ret = btrfs_read_buffer(next, ptr_gen); |
2335 | if (ret) { | |
2336 | free_extent_buffer(next); | |
2337 | return ret; | |
2338 | } | |
e02119d5 | 2339 | |
681ae509 JB |
2340 | if (trans) { |
2341 | btrfs_tree_lock(next); | |
2342 | btrfs_set_lock_blocking(next); | |
01d58472 DD |
2343 | clean_tree_block(trans, root->fs_info, |
2344 | next); | |
681ae509 JB |
2345 | btrfs_wait_tree_block_writeback(next); |
2346 | btrfs_tree_unlock(next); | |
2347 | } | |
e02119d5 | 2348 | |
e02119d5 CM |
2349 | WARN_ON(root_owner != |
2350 | BTRFS_TREE_LOG_OBJECTID); | |
e688b725 | 2351 | ret = btrfs_free_and_pin_reserved_extent(root, |
d00aff00 | 2352 | bytenr, blocksize); |
3650860b JB |
2353 | if (ret) { |
2354 | free_extent_buffer(next); | |
2355 | return ret; | |
2356 | } | |
e02119d5 CM |
2357 | } |
2358 | free_extent_buffer(next); | |
2359 | continue; | |
2360 | } | |
018642a1 TI |
2361 | ret = btrfs_read_buffer(next, ptr_gen); |
2362 | if (ret) { | |
2363 | free_extent_buffer(next); | |
2364 | return ret; | |
2365 | } | |
e02119d5 CM |
2366 | |
2367 | WARN_ON(*level <= 0); | |
2368 | if (path->nodes[*level-1]) | |
2369 | free_extent_buffer(path->nodes[*level-1]); | |
2370 | path->nodes[*level-1] = next; | |
2371 | *level = btrfs_header_level(next); | |
2372 | path->slots[*level] = 0; | |
2373 | cond_resched(); | |
2374 | } | |
2375 | WARN_ON(*level < 0); | |
2376 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
2377 | ||
4a500fd1 | 2378 | path->slots[*level] = btrfs_header_nritems(path->nodes[*level]); |
e02119d5 CM |
2379 | |
2380 | cond_resched(); | |
2381 | return 0; | |
2382 | } | |
2383 | ||
d397712b | 2384 | static noinline int walk_up_log_tree(struct btrfs_trans_handle *trans, |
e02119d5 CM |
2385 | struct btrfs_root *root, |
2386 | struct btrfs_path *path, int *level, | |
2387 | struct walk_control *wc) | |
2388 | { | |
2389 | u64 root_owner; | |
e02119d5 CM |
2390 | int i; |
2391 | int slot; | |
2392 | int ret; | |
2393 | ||
d397712b | 2394 | for (i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { |
e02119d5 | 2395 | slot = path->slots[i]; |
4a500fd1 | 2396 | if (slot + 1 < btrfs_header_nritems(path->nodes[i])) { |
e02119d5 CM |
2397 | path->slots[i]++; |
2398 | *level = i; | |
2399 | WARN_ON(*level == 0); | |
2400 | return 0; | |
2401 | } else { | |
31840ae1 ZY |
2402 | struct extent_buffer *parent; |
2403 | if (path->nodes[*level] == root->node) | |
2404 | parent = path->nodes[*level]; | |
2405 | else | |
2406 | parent = path->nodes[*level + 1]; | |
2407 | ||
2408 | root_owner = btrfs_header_owner(parent); | |
1e5063d0 | 2409 | ret = wc->process_func(root, path->nodes[*level], wc, |
e02119d5 | 2410 | btrfs_header_generation(path->nodes[*level])); |
1e5063d0 MF |
2411 | if (ret) |
2412 | return ret; | |
2413 | ||
e02119d5 CM |
2414 | if (wc->free) { |
2415 | struct extent_buffer *next; | |
2416 | ||
2417 | next = path->nodes[*level]; | |
2418 | ||
681ae509 JB |
2419 | if (trans) { |
2420 | btrfs_tree_lock(next); | |
2421 | btrfs_set_lock_blocking(next); | |
01d58472 DD |
2422 | clean_tree_block(trans, root->fs_info, |
2423 | next); | |
681ae509 JB |
2424 | btrfs_wait_tree_block_writeback(next); |
2425 | btrfs_tree_unlock(next); | |
2426 | } | |
e02119d5 | 2427 | |
e02119d5 | 2428 | WARN_ON(root_owner != BTRFS_TREE_LOG_OBJECTID); |
e688b725 | 2429 | ret = btrfs_free_and_pin_reserved_extent(root, |
e02119d5 | 2430 | path->nodes[*level]->start, |
d00aff00 | 2431 | path->nodes[*level]->len); |
3650860b JB |
2432 | if (ret) |
2433 | return ret; | |
e02119d5 CM |
2434 | } |
2435 | free_extent_buffer(path->nodes[*level]); | |
2436 | path->nodes[*level] = NULL; | |
2437 | *level = i + 1; | |
2438 | } | |
2439 | } | |
2440 | return 1; | |
2441 | } | |
2442 | ||
2443 | /* | |
2444 | * drop the reference count on the tree rooted at 'snap'. This traverses | |
2445 | * the tree freeing any blocks that have a ref count of zero after being | |
2446 | * decremented. | |
2447 | */ | |
2448 | static int walk_log_tree(struct btrfs_trans_handle *trans, | |
2449 | struct btrfs_root *log, struct walk_control *wc) | |
2450 | { | |
2451 | int ret = 0; | |
2452 | int wret; | |
2453 | int level; | |
2454 | struct btrfs_path *path; | |
e02119d5 CM |
2455 | int orig_level; |
2456 | ||
2457 | path = btrfs_alloc_path(); | |
db5b493a TI |
2458 | if (!path) |
2459 | return -ENOMEM; | |
e02119d5 CM |
2460 | |
2461 | level = btrfs_header_level(log->node); | |
2462 | orig_level = level; | |
2463 | path->nodes[level] = log->node; | |
2464 | extent_buffer_get(log->node); | |
2465 | path->slots[level] = 0; | |
2466 | ||
d397712b | 2467 | while (1) { |
e02119d5 CM |
2468 | wret = walk_down_log_tree(trans, log, path, &level, wc); |
2469 | if (wret > 0) | |
2470 | break; | |
79787eaa | 2471 | if (wret < 0) { |
e02119d5 | 2472 | ret = wret; |
79787eaa JM |
2473 | goto out; |
2474 | } | |
e02119d5 CM |
2475 | |
2476 | wret = walk_up_log_tree(trans, log, path, &level, wc); | |
2477 | if (wret > 0) | |
2478 | break; | |
79787eaa | 2479 | if (wret < 0) { |
e02119d5 | 2480 | ret = wret; |
79787eaa JM |
2481 | goto out; |
2482 | } | |
e02119d5 CM |
2483 | } |
2484 | ||
2485 | /* was the root node processed? if not, catch it here */ | |
2486 | if (path->nodes[orig_level]) { | |
79787eaa | 2487 | ret = wc->process_func(log, path->nodes[orig_level], wc, |
e02119d5 | 2488 | btrfs_header_generation(path->nodes[orig_level])); |
79787eaa JM |
2489 | if (ret) |
2490 | goto out; | |
e02119d5 CM |
2491 | if (wc->free) { |
2492 | struct extent_buffer *next; | |
2493 | ||
2494 | next = path->nodes[orig_level]; | |
2495 | ||
681ae509 JB |
2496 | if (trans) { |
2497 | btrfs_tree_lock(next); | |
2498 | btrfs_set_lock_blocking(next); | |
01d58472 | 2499 | clean_tree_block(trans, log->fs_info, next); |
681ae509 JB |
2500 | btrfs_wait_tree_block_writeback(next); |
2501 | btrfs_tree_unlock(next); | |
2502 | } | |
e02119d5 | 2503 | |
e02119d5 CM |
2504 | WARN_ON(log->root_key.objectid != |
2505 | BTRFS_TREE_LOG_OBJECTID); | |
e688b725 | 2506 | ret = btrfs_free_and_pin_reserved_extent(log, next->start, |
d00aff00 | 2507 | next->len); |
3650860b JB |
2508 | if (ret) |
2509 | goto out; | |
e02119d5 CM |
2510 | } |
2511 | } | |
2512 | ||
79787eaa | 2513 | out: |
e02119d5 | 2514 | btrfs_free_path(path); |
e02119d5 CM |
2515 | return ret; |
2516 | } | |
2517 | ||
7237f183 YZ |
2518 | /* |
2519 | * helper function to update the item for a given subvolumes log root | |
2520 | * in the tree of log roots | |
2521 | */ | |
2522 | static int update_log_root(struct btrfs_trans_handle *trans, | |
2523 | struct btrfs_root *log) | |
2524 | { | |
2525 | int ret; | |
2526 | ||
2527 | if (log->log_transid == 1) { | |
2528 | /* insert root item on the first sync */ | |
2529 | ret = btrfs_insert_root(trans, log->fs_info->log_root_tree, | |
2530 | &log->root_key, &log->root_item); | |
2531 | } else { | |
2532 | ret = btrfs_update_root(trans, log->fs_info->log_root_tree, | |
2533 | &log->root_key, &log->root_item); | |
2534 | } | |
2535 | return ret; | |
2536 | } | |
2537 | ||
8b050d35 MX |
2538 | static void wait_log_commit(struct btrfs_trans_handle *trans, |
2539 | struct btrfs_root *root, int transid) | |
e02119d5 CM |
2540 | { |
2541 | DEFINE_WAIT(wait); | |
7237f183 | 2542 | int index = transid % 2; |
e02119d5 | 2543 | |
7237f183 YZ |
2544 | /* |
2545 | * we only allow two pending log transactions at a time, | |
2546 | * so we know that if ours is more than 2 older than the | |
2547 | * current transaction, we're done | |
2548 | */ | |
e02119d5 | 2549 | do { |
7237f183 YZ |
2550 | prepare_to_wait(&root->log_commit_wait[index], |
2551 | &wait, TASK_UNINTERRUPTIBLE); | |
2552 | mutex_unlock(&root->log_mutex); | |
12fcfd22 | 2553 | |
d1433deb | 2554 | if (root->log_transid_committed < transid && |
7237f183 YZ |
2555 | atomic_read(&root->log_commit[index])) |
2556 | schedule(); | |
12fcfd22 | 2557 | |
7237f183 YZ |
2558 | finish_wait(&root->log_commit_wait[index], &wait); |
2559 | mutex_lock(&root->log_mutex); | |
d1433deb | 2560 | } while (root->log_transid_committed < transid && |
7237f183 | 2561 | atomic_read(&root->log_commit[index])); |
7237f183 YZ |
2562 | } |
2563 | ||
143bede5 JM |
2564 | static void wait_for_writer(struct btrfs_trans_handle *trans, |
2565 | struct btrfs_root *root) | |
7237f183 YZ |
2566 | { |
2567 | DEFINE_WAIT(wait); | |
8b050d35 MX |
2568 | |
2569 | while (atomic_read(&root->log_writers)) { | |
7237f183 YZ |
2570 | prepare_to_wait(&root->log_writer_wait, |
2571 | &wait, TASK_UNINTERRUPTIBLE); | |
2572 | mutex_unlock(&root->log_mutex); | |
8b050d35 | 2573 | if (atomic_read(&root->log_writers)) |
e02119d5 | 2574 | schedule(); |
7237f183 | 2575 | finish_wait(&root->log_writer_wait, &wait); |
575849ec | 2576 | mutex_lock(&root->log_mutex); |
7237f183 | 2577 | } |
e02119d5 CM |
2578 | } |
2579 | ||
8b050d35 MX |
2580 | static inline void btrfs_remove_log_ctx(struct btrfs_root *root, |
2581 | struct btrfs_log_ctx *ctx) | |
2582 | { | |
2583 | if (!ctx) | |
2584 | return; | |
2585 | ||
2586 | mutex_lock(&root->log_mutex); | |
2587 | list_del_init(&ctx->list); | |
2588 | mutex_unlock(&root->log_mutex); | |
2589 | } | |
2590 | ||
2591 | /* | |
2592 | * Invoked in log mutex context, or be sure there is no other task which | |
2593 | * can access the list. | |
2594 | */ | |
2595 | static inline void btrfs_remove_all_log_ctxs(struct btrfs_root *root, | |
2596 | int index, int error) | |
2597 | { | |
2598 | struct btrfs_log_ctx *ctx; | |
2599 | ||
2600 | if (!error) { | |
2601 | INIT_LIST_HEAD(&root->log_ctxs[index]); | |
2602 | return; | |
2603 | } | |
2604 | ||
2605 | list_for_each_entry(ctx, &root->log_ctxs[index], list) | |
2606 | ctx->log_ret = error; | |
2607 | ||
2608 | INIT_LIST_HEAD(&root->log_ctxs[index]); | |
2609 | } | |
2610 | ||
e02119d5 CM |
2611 | /* |
2612 | * btrfs_sync_log does sends a given tree log down to the disk and | |
2613 | * updates the super blocks to record it. When this call is done, | |
12fcfd22 CM |
2614 | * you know that any inodes previously logged are safely on disk only |
2615 | * if it returns 0. | |
2616 | * | |
2617 | * Any other return value means you need to call btrfs_commit_transaction. | |
2618 | * Some of the edge cases for fsyncing directories that have had unlinks | |
2619 | * or renames done in the past mean that sometimes the only safe | |
2620 | * fsync is to commit the whole FS. When btrfs_sync_log returns -EAGAIN, | |
2621 | * that has happened. | |
e02119d5 CM |
2622 | */ |
2623 | int btrfs_sync_log(struct btrfs_trans_handle *trans, | |
8b050d35 | 2624 | struct btrfs_root *root, struct btrfs_log_ctx *ctx) |
e02119d5 | 2625 | { |
7237f183 YZ |
2626 | int index1; |
2627 | int index2; | |
8cef4e16 | 2628 | int mark; |
e02119d5 | 2629 | int ret; |
e02119d5 | 2630 | struct btrfs_root *log = root->log_root; |
7237f183 | 2631 | struct btrfs_root *log_root_tree = root->fs_info->log_root_tree; |
bb14a59b | 2632 | int log_transid = 0; |
8b050d35 | 2633 | struct btrfs_log_ctx root_log_ctx; |
c6adc9cc | 2634 | struct blk_plug plug; |
e02119d5 | 2635 | |
7237f183 | 2636 | mutex_lock(&root->log_mutex); |
d1433deb MX |
2637 | log_transid = ctx->log_transid; |
2638 | if (root->log_transid_committed >= log_transid) { | |
2639 | mutex_unlock(&root->log_mutex); | |
2640 | return ctx->log_ret; | |
2641 | } | |
2642 | ||
2643 | index1 = log_transid % 2; | |
7237f183 | 2644 | if (atomic_read(&root->log_commit[index1])) { |
d1433deb | 2645 | wait_log_commit(trans, root, log_transid); |
7237f183 | 2646 | mutex_unlock(&root->log_mutex); |
8b050d35 | 2647 | return ctx->log_ret; |
e02119d5 | 2648 | } |
d1433deb | 2649 | ASSERT(log_transid == root->log_transid); |
7237f183 YZ |
2650 | atomic_set(&root->log_commit[index1], 1); |
2651 | ||
2652 | /* wait for previous tree log sync to complete */ | |
2653 | if (atomic_read(&root->log_commit[(index1 + 1) % 2])) | |
d1433deb | 2654 | wait_log_commit(trans, root, log_transid - 1); |
48cab2e0 | 2655 | |
86df7eb9 | 2656 | while (1) { |
2ecb7923 | 2657 | int batch = atomic_read(&root->log_batch); |
cd354ad6 | 2658 | /* when we're on an ssd, just kick the log commit out */ |
27cdeb70 MX |
2659 | if (!btrfs_test_opt(root, SSD) && |
2660 | test_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state)) { | |
86df7eb9 YZ |
2661 | mutex_unlock(&root->log_mutex); |
2662 | schedule_timeout_uninterruptible(1); | |
2663 | mutex_lock(&root->log_mutex); | |
2664 | } | |
12fcfd22 | 2665 | wait_for_writer(trans, root); |
2ecb7923 | 2666 | if (batch == atomic_read(&root->log_batch)) |
e02119d5 CM |
2667 | break; |
2668 | } | |
e02119d5 | 2669 | |
12fcfd22 | 2670 | /* bail out if we need to do a full commit */ |
995946dd | 2671 | if (btrfs_need_log_full_commit(root->fs_info, trans)) { |
12fcfd22 | 2672 | ret = -EAGAIN; |
2ab28f32 | 2673 | btrfs_free_logged_extents(log, log_transid); |
12fcfd22 CM |
2674 | mutex_unlock(&root->log_mutex); |
2675 | goto out; | |
2676 | } | |
2677 | ||
8cef4e16 YZ |
2678 | if (log_transid % 2 == 0) |
2679 | mark = EXTENT_DIRTY; | |
2680 | else | |
2681 | mark = EXTENT_NEW; | |
2682 | ||
690587d1 CM |
2683 | /* we start IO on all the marked extents here, but we don't actually |
2684 | * wait for them until later. | |
2685 | */ | |
c6adc9cc | 2686 | blk_start_plug(&plug); |
8cef4e16 | 2687 | ret = btrfs_write_marked_extents(log, &log->dirty_log_pages, mark); |
79787eaa | 2688 | if (ret) { |
c6adc9cc | 2689 | blk_finish_plug(&plug); |
79787eaa | 2690 | btrfs_abort_transaction(trans, root, ret); |
2ab28f32 | 2691 | btrfs_free_logged_extents(log, log_transid); |
995946dd | 2692 | btrfs_set_log_full_commit(root->fs_info, trans); |
79787eaa JM |
2693 | mutex_unlock(&root->log_mutex); |
2694 | goto out; | |
2695 | } | |
7237f183 | 2696 | |
5d4f98a2 | 2697 | btrfs_set_root_node(&log->root_item, log->node); |
7237f183 | 2698 | |
7237f183 YZ |
2699 | root->log_transid++; |
2700 | log->log_transid = root->log_transid; | |
ff782e0a | 2701 | root->log_start_pid = 0; |
7237f183 | 2702 | /* |
8cef4e16 YZ |
2703 | * IO has been started, blocks of the log tree have WRITTEN flag set |
2704 | * in their headers. new modifications of the log will be written to | |
2705 | * new positions. so it's safe to allow log writers to go in. | |
7237f183 YZ |
2706 | */ |
2707 | mutex_unlock(&root->log_mutex); | |
2708 | ||
d1433deb MX |
2709 | btrfs_init_log_ctx(&root_log_ctx); |
2710 | ||
7237f183 | 2711 | mutex_lock(&log_root_tree->log_mutex); |
2ecb7923 | 2712 | atomic_inc(&log_root_tree->log_batch); |
7237f183 | 2713 | atomic_inc(&log_root_tree->log_writers); |
d1433deb MX |
2714 | |
2715 | index2 = log_root_tree->log_transid % 2; | |
2716 | list_add_tail(&root_log_ctx.list, &log_root_tree->log_ctxs[index2]); | |
2717 | root_log_ctx.log_transid = log_root_tree->log_transid; | |
2718 | ||
7237f183 YZ |
2719 | mutex_unlock(&log_root_tree->log_mutex); |
2720 | ||
2721 | ret = update_log_root(trans, log); | |
7237f183 YZ |
2722 | |
2723 | mutex_lock(&log_root_tree->log_mutex); | |
2724 | if (atomic_dec_and_test(&log_root_tree->log_writers)) { | |
2725 | smp_mb(); | |
2726 | if (waitqueue_active(&log_root_tree->log_writer_wait)) | |
2727 | wake_up(&log_root_tree->log_writer_wait); | |
2728 | } | |
2729 | ||
4a500fd1 | 2730 | if (ret) { |
d1433deb MX |
2731 | if (!list_empty(&root_log_ctx.list)) |
2732 | list_del_init(&root_log_ctx.list); | |
2733 | ||
c6adc9cc | 2734 | blk_finish_plug(&plug); |
995946dd MX |
2735 | btrfs_set_log_full_commit(root->fs_info, trans); |
2736 | ||
79787eaa JM |
2737 | if (ret != -ENOSPC) { |
2738 | btrfs_abort_transaction(trans, root, ret); | |
2739 | mutex_unlock(&log_root_tree->log_mutex); | |
2740 | goto out; | |
2741 | } | |
4a500fd1 | 2742 | btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); |
2ab28f32 | 2743 | btrfs_free_logged_extents(log, log_transid); |
4a500fd1 YZ |
2744 | mutex_unlock(&log_root_tree->log_mutex); |
2745 | ret = -EAGAIN; | |
2746 | goto out; | |
2747 | } | |
2748 | ||
d1433deb | 2749 | if (log_root_tree->log_transid_committed >= root_log_ctx.log_transid) { |
3da5ab56 | 2750 | blk_finish_plug(&plug); |
d1433deb MX |
2751 | mutex_unlock(&log_root_tree->log_mutex); |
2752 | ret = root_log_ctx.log_ret; | |
2753 | goto out; | |
2754 | } | |
8b050d35 | 2755 | |
d1433deb | 2756 | index2 = root_log_ctx.log_transid % 2; |
7237f183 | 2757 | if (atomic_read(&log_root_tree->log_commit[index2])) { |
c6adc9cc | 2758 | blk_finish_plug(&plug); |
5ab5e44a FM |
2759 | ret = btrfs_wait_marked_extents(log, &log->dirty_log_pages, |
2760 | mark); | |
50d9aa99 | 2761 | btrfs_wait_logged_extents(trans, log, log_transid); |
8b050d35 | 2762 | wait_log_commit(trans, log_root_tree, |
d1433deb | 2763 | root_log_ctx.log_transid); |
7237f183 | 2764 | mutex_unlock(&log_root_tree->log_mutex); |
5ab5e44a FM |
2765 | if (!ret) |
2766 | ret = root_log_ctx.log_ret; | |
7237f183 YZ |
2767 | goto out; |
2768 | } | |
d1433deb | 2769 | ASSERT(root_log_ctx.log_transid == log_root_tree->log_transid); |
7237f183 YZ |
2770 | atomic_set(&log_root_tree->log_commit[index2], 1); |
2771 | ||
12fcfd22 CM |
2772 | if (atomic_read(&log_root_tree->log_commit[(index2 + 1) % 2])) { |
2773 | wait_log_commit(trans, log_root_tree, | |
d1433deb | 2774 | root_log_ctx.log_transid - 1); |
12fcfd22 CM |
2775 | } |
2776 | ||
2777 | wait_for_writer(trans, log_root_tree); | |
7237f183 | 2778 | |
12fcfd22 CM |
2779 | /* |
2780 | * now that we've moved on to the tree of log tree roots, | |
2781 | * check the full commit flag again | |
2782 | */ | |
995946dd | 2783 | if (btrfs_need_log_full_commit(root->fs_info, trans)) { |
c6adc9cc | 2784 | blk_finish_plug(&plug); |
8cef4e16 | 2785 | btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); |
2ab28f32 | 2786 | btrfs_free_logged_extents(log, log_transid); |
12fcfd22 CM |
2787 | mutex_unlock(&log_root_tree->log_mutex); |
2788 | ret = -EAGAIN; | |
2789 | goto out_wake_log_root; | |
2790 | } | |
7237f183 | 2791 | |
c6adc9cc MX |
2792 | ret = btrfs_write_marked_extents(log_root_tree, |
2793 | &log_root_tree->dirty_log_pages, | |
2794 | EXTENT_DIRTY | EXTENT_NEW); | |
2795 | blk_finish_plug(&plug); | |
79787eaa | 2796 | if (ret) { |
995946dd | 2797 | btrfs_set_log_full_commit(root->fs_info, trans); |
79787eaa | 2798 | btrfs_abort_transaction(trans, root, ret); |
2ab28f32 | 2799 | btrfs_free_logged_extents(log, log_transid); |
79787eaa JM |
2800 | mutex_unlock(&log_root_tree->log_mutex); |
2801 | goto out_wake_log_root; | |
2802 | } | |
5ab5e44a FM |
2803 | ret = btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); |
2804 | if (!ret) | |
2805 | ret = btrfs_wait_marked_extents(log_root_tree, | |
2806 | &log_root_tree->dirty_log_pages, | |
2807 | EXTENT_NEW | EXTENT_DIRTY); | |
2808 | if (ret) { | |
2809 | btrfs_set_log_full_commit(root->fs_info, trans); | |
2810 | btrfs_free_logged_extents(log, log_transid); | |
2811 | mutex_unlock(&log_root_tree->log_mutex); | |
2812 | goto out_wake_log_root; | |
2813 | } | |
50d9aa99 | 2814 | btrfs_wait_logged_extents(trans, log, log_transid); |
e02119d5 | 2815 | |
6c41761f | 2816 | btrfs_set_super_log_root(root->fs_info->super_for_commit, |
7237f183 | 2817 | log_root_tree->node->start); |
6c41761f | 2818 | btrfs_set_super_log_root_level(root->fs_info->super_for_commit, |
7237f183 | 2819 | btrfs_header_level(log_root_tree->node)); |
e02119d5 | 2820 | |
7237f183 | 2821 | log_root_tree->log_transid++; |
7237f183 YZ |
2822 | mutex_unlock(&log_root_tree->log_mutex); |
2823 | ||
2824 | /* | |
2825 | * nobody else is going to jump in and write the the ctree | |
2826 | * super here because the log_commit atomic below is protecting | |
2827 | * us. We must be called with a transaction handle pinning | |
2828 | * the running transaction open, so a full commit can't hop | |
2829 | * in and cause problems either. | |
2830 | */ | |
5af3e8cc | 2831 | ret = write_ctree_super(trans, root->fs_info->tree_root, 1); |
5af3e8cc | 2832 | if (ret) { |
995946dd | 2833 | btrfs_set_log_full_commit(root->fs_info, trans); |
5af3e8cc SB |
2834 | btrfs_abort_transaction(trans, root, ret); |
2835 | goto out_wake_log_root; | |
2836 | } | |
7237f183 | 2837 | |
257c62e1 CM |
2838 | mutex_lock(&root->log_mutex); |
2839 | if (root->last_log_commit < log_transid) | |
2840 | root->last_log_commit = log_transid; | |
2841 | mutex_unlock(&root->log_mutex); | |
2842 | ||
12fcfd22 | 2843 | out_wake_log_root: |
8b050d35 MX |
2844 | /* |
2845 | * We needn't get log_mutex here because we are sure all | |
2846 | * the other tasks are blocked. | |
2847 | */ | |
2848 | btrfs_remove_all_log_ctxs(log_root_tree, index2, ret); | |
2849 | ||
d1433deb MX |
2850 | mutex_lock(&log_root_tree->log_mutex); |
2851 | log_root_tree->log_transid_committed++; | |
7237f183 | 2852 | atomic_set(&log_root_tree->log_commit[index2], 0); |
d1433deb MX |
2853 | mutex_unlock(&log_root_tree->log_mutex); |
2854 | ||
7237f183 YZ |
2855 | if (waitqueue_active(&log_root_tree->log_commit_wait[index2])) |
2856 | wake_up(&log_root_tree->log_commit_wait[index2]); | |
e02119d5 | 2857 | out: |
8b050d35 MX |
2858 | /* See above. */ |
2859 | btrfs_remove_all_log_ctxs(root, index1, ret); | |
2860 | ||
d1433deb MX |
2861 | mutex_lock(&root->log_mutex); |
2862 | root->log_transid_committed++; | |
7237f183 | 2863 | atomic_set(&root->log_commit[index1], 0); |
d1433deb | 2864 | mutex_unlock(&root->log_mutex); |
8b050d35 | 2865 | |
7237f183 YZ |
2866 | if (waitqueue_active(&root->log_commit_wait[index1])) |
2867 | wake_up(&root->log_commit_wait[index1]); | |
b31eabd8 | 2868 | return ret; |
e02119d5 CM |
2869 | } |
2870 | ||
4a500fd1 YZ |
2871 | static void free_log_tree(struct btrfs_trans_handle *trans, |
2872 | struct btrfs_root *log) | |
e02119d5 CM |
2873 | { |
2874 | int ret; | |
d0c803c4 CM |
2875 | u64 start; |
2876 | u64 end; | |
e02119d5 CM |
2877 | struct walk_control wc = { |
2878 | .free = 1, | |
2879 | .process_func = process_one_buffer | |
2880 | }; | |
2881 | ||
681ae509 JB |
2882 | ret = walk_log_tree(trans, log, &wc); |
2883 | /* I don't think this can happen but just in case */ | |
2884 | if (ret) | |
2885 | btrfs_abort_transaction(trans, log, ret); | |
e02119d5 | 2886 | |
d397712b | 2887 | while (1) { |
d0c803c4 | 2888 | ret = find_first_extent_bit(&log->dirty_log_pages, |
e6138876 JB |
2889 | 0, &start, &end, EXTENT_DIRTY | EXTENT_NEW, |
2890 | NULL); | |
d0c803c4 CM |
2891 | if (ret) |
2892 | break; | |
2893 | ||
8cef4e16 YZ |
2894 | clear_extent_bits(&log->dirty_log_pages, start, end, |
2895 | EXTENT_DIRTY | EXTENT_NEW, GFP_NOFS); | |
d0c803c4 CM |
2896 | } |
2897 | ||
2ab28f32 JB |
2898 | /* |
2899 | * We may have short-circuited the log tree with the full commit logic | |
2900 | * and left ordered extents on our list, so clear these out to keep us | |
2901 | * from leaking inodes and memory. | |
2902 | */ | |
2903 | btrfs_free_logged_extents(log, 0); | |
2904 | btrfs_free_logged_extents(log, 1); | |
2905 | ||
7237f183 YZ |
2906 | free_extent_buffer(log->node); |
2907 | kfree(log); | |
4a500fd1 YZ |
2908 | } |
2909 | ||
2910 | /* | |
2911 | * free all the extents used by the tree log. This should be called | |
2912 | * at commit time of the full transaction | |
2913 | */ | |
2914 | int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root) | |
2915 | { | |
2916 | if (root->log_root) { | |
2917 | free_log_tree(trans, root->log_root); | |
2918 | root->log_root = NULL; | |
2919 | } | |
2920 | return 0; | |
2921 | } | |
2922 | ||
2923 | int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, | |
2924 | struct btrfs_fs_info *fs_info) | |
2925 | { | |
2926 | if (fs_info->log_root_tree) { | |
2927 | free_log_tree(trans, fs_info->log_root_tree); | |
2928 | fs_info->log_root_tree = NULL; | |
2929 | } | |
e02119d5 CM |
2930 | return 0; |
2931 | } | |
2932 | ||
e02119d5 CM |
2933 | /* |
2934 | * If both a file and directory are logged, and unlinks or renames are | |
2935 | * mixed in, we have a few interesting corners: | |
2936 | * | |
2937 | * create file X in dir Y | |
2938 | * link file X to X.link in dir Y | |
2939 | * fsync file X | |
2940 | * unlink file X but leave X.link | |
2941 | * fsync dir Y | |
2942 | * | |
2943 | * After a crash we would expect only X.link to exist. But file X | |
2944 | * didn't get fsync'd again so the log has back refs for X and X.link. | |
2945 | * | |
2946 | * We solve this by removing directory entries and inode backrefs from the | |
2947 | * log when a file that was logged in the current transaction is | |
2948 | * unlinked. Any later fsync will include the updated log entries, and | |
2949 | * we'll be able to reconstruct the proper directory items from backrefs. | |
2950 | * | |
2951 | * This optimizations allows us to avoid relogging the entire inode | |
2952 | * or the entire directory. | |
2953 | */ | |
2954 | int btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans, | |
2955 | struct btrfs_root *root, | |
2956 | const char *name, int name_len, | |
2957 | struct inode *dir, u64 index) | |
2958 | { | |
2959 | struct btrfs_root *log; | |
2960 | struct btrfs_dir_item *di; | |
2961 | struct btrfs_path *path; | |
2962 | int ret; | |
4a500fd1 | 2963 | int err = 0; |
e02119d5 | 2964 | int bytes_del = 0; |
33345d01 | 2965 | u64 dir_ino = btrfs_ino(dir); |
e02119d5 | 2966 | |
3a5f1d45 CM |
2967 | if (BTRFS_I(dir)->logged_trans < trans->transid) |
2968 | return 0; | |
2969 | ||
e02119d5 CM |
2970 | ret = join_running_log_trans(root); |
2971 | if (ret) | |
2972 | return 0; | |
2973 | ||
2974 | mutex_lock(&BTRFS_I(dir)->log_mutex); | |
2975 | ||
2976 | log = root->log_root; | |
2977 | path = btrfs_alloc_path(); | |
a62f44a5 TI |
2978 | if (!path) { |
2979 | err = -ENOMEM; | |
2980 | goto out_unlock; | |
2981 | } | |
2a29edc6 | 2982 | |
33345d01 | 2983 | di = btrfs_lookup_dir_item(trans, log, path, dir_ino, |
e02119d5 | 2984 | name, name_len, -1); |
4a500fd1 YZ |
2985 | if (IS_ERR(di)) { |
2986 | err = PTR_ERR(di); | |
2987 | goto fail; | |
2988 | } | |
2989 | if (di) { | |
e02119d5 CM |
2990 | ret = btrfs_delete_one_dir_name(trans, log, path, di); |
2991 | bytes_del += name_len; | |
3650860b JB |
2992 | if (ret) { |
2993 | err = ret; | |
2994 | goto fail; | |
2995 | } | |
e02119d5 | 2996 | } |
b3b4aa74 | 2997 | btrfs_release_path(path); |
33345d01 | 2998 | di = btrfs_lookup_dir_index_item(trans, log, path, dir_ino, |
e02119d5 | 2999 | index, name, name_len, -1); |
4a500fd1 YZ |
3000 | if (IS_ERR(di)) { |
3001 | err = PTR_ERR(di); | |
3002 | goto fail; | |
3003 | } | |
3004 | if (di) { | |
e02119d5 CM |
3005 | ret = btrfs_delete_one_dir_name(trans, log, path, di); |
3006 | bytes_del += name_len; | |
3650860b JB |
3007 | if (ret) { |
3008 | err = ret; | |
3009 | goto fail; | |
3010 | } | |
e02119d5 CM |
3011 | } |
3012 | ||
3013 | /* update the directory size in the log to reflect the names | |
3014 | * we have removed | |
3015 | */ | |
3016 | if (bytes_del) { | |
3017 | struct btrfs_key key; | |
3018 | ||
33345d01 | 3019 | key.objectid = dir_ino; |
e02119d5 CM |
3020 | key.offset = 0; |
3021 | key.type = BTRFS_INODE_ITEM_KEY; | |
b3b4aa74 | 3022 | btrfs_release_path(path); |
e02119d5 CM |
3023 | |
3024 | ret = btrfs_search_slot(trans, log, &key, path, 0, 1); | |
4a500fd1 YZ |
3025 | if (ret < 0) { |
3026 | err = ret; | |
3027 | goto fail; | |
3028 | } | |
e02119d5 CM |
3029 | if (ret == 0) { |
3030 | struct btrfs_inode_item *item; | |
3031 | u64 i_size; | |
3032 | ||
3033 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3034 | struct btrfs_inode_item); | |
3035 | i_size = btrfs_inode_size(path->nodes[0], item); | |
3036 | if (i_size > bytes_del) | |
3037 | i_size -= bytes_del; | |
3038 | else | |
3039 | i_size = 0; | |
3040 | btrfs_set_inode_size(path->nodes[0], item, i_size); | |
3041 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
3042 | } else | |
3043 | ret = 0; | |
b3b4aa74 | 3044 | btrfs_release_path(path); |
e02119d5 | 3045 | } |
4a500fd1 | 3046 | fail: |
e02119d5 | 3047 | btrfs_free_path(path); |
a62f44a5 | 3048 | out_unlock: |
e02119d5 | 3049 | mutex_unlock(&BTRFS_I(dir)->log_mutex); |
4a500fd1 | 3050 | if (ret == -ENOSPC) { |
995946dd | 3051 | btrfs_set_log_full_commit(root->fs_info, trans); |
4a500fd1 | 3052 | ret = 0; |
79787eaa JM |
3053 | } else if (ret < 0) |
3054 | btrfs_abort_transaction(trans, root, ret); | |
3055 | ||
12fcfd22 | 3056 | btrfs_end_log_trans(root); |
e02119d5 | 3057 | |
411fc6bc | 3058 | return err; |
e02119d5 CM |
3059 | } |
3060 | ||
3061 | /* see comments for btrfs_del_dir_entries_in_log */ | |
3062 | int btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans, | |
3063 | struct btrfs_root *root, | |
3064 | const char *name, int name_len, | |
3065 | struct inode *inode, u64 dirid) | |
3066 | { | |
3067 | struct btrfs_root *log; | |
3068 | u64 index; | |
3069 | int ret; | |
3070 | ||
3a5f1d45 CM |
3071 | if (BTRFS_I(inode)->logged_trans < trans->transid) |
3072 | return 0; | |
3073 | ||
e02119d5 CM |
3074 | ret = join_running_log_trans(root); |
3075 | if (ret) | |
3076 | return 0; | |
3077 | log = root->log_root; | |
3078 | mutex_lock(&BTRFS_I(inode)->log_mutex); | |
3079 | ||
33345d01 | 3080 | ret = btrfs_del_inode_ref(trans, log, name, name_len, btrfs_ino(inode), |
e02119d5 CM |
3081 | dirid, &index); |
3082 | mutex_unlock(&BTRFS_I(inode)->log_mutex); | |
4a500fd1 | 3083 | if (ret == -ENOSPC) { |
995946dd | 3084 | btrfs_set_log_full_commit(root->fs_info, trans); |
4a500fd1 | 3085 | ret = 0; |
79787eaa JM |
3086 | } else if (ret < 0 && ret != -ENOENT) |
3087 | btrfs_abort_transaction(trans, root, ret); | |
12fcfd22 | 3088 | btrfs_end_log_trans(root); |
e02119d5 | 3089 | |
e02119d5 CM |
3090 | return ret; |
3091 | } | |
3092 | ||
3093 | /* | |
3094 | * creates a range item in the log for 'dirid'. first_offset and | |
3095 | * last_offset tell us which parts of the key space the log should | |
3096 | * be considered authoritative for. | |
3097 | */ | |
3098 | static noinline int insert_dir_log_key(struct btrfs_trans_handle *trans, | |
3099 | struct btrfs_root *log, | |
3100 | struct btrfs_path *path, | |
3101 | int key_type, u64 dirid, | |
3102 | u64 first_offset, u64 last_offset) | |
3103 | { | |
3104 | int ret; | |
3105 | struct btrfs_key key; | |
3106 | struct btrfs_dir_log_item *item; | |
3107 | ||
3108 | key.objectid = dirid; | |
3109 | key.offset = first_offset; | |
3110 | if (key_type == BTRFS_DIR_ITEM_KEY) | |
3111 | key.type = BTRFS_DIR_LOG_ITEM_KEY; | |
3112 | else | |
3113 | key.type = BTRFS_DIR_LOG_INDEX_KEY; | |
3114 | ret = btrfs_insert_empty_item(trans, log, path, &key, sizeof(*item)); | |
4a500fd1 YZ |
3115 | if (ret) |
3116 | return ret; | |
e02119d5 CM |
3117 | |
3118 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3119 | struct btrfs_dir_log_item); | |
3120 | btrfs_set_dir_log_end(path->nodes[0], item, last_offset); | |
3121 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
b3b4aa74 | 3122 | btrfs_release_path(path); |
e02119d5 CM |
3123 | return 0; |
3124 | } | |
3125 | ||
3126 | /* | |
3127 | * log all the items included in the current transaction for a given | |
3128 | * directory. This also creates the range items in the log tree required | |
3129 | * to replay anything deleted before the fsync | |
3130 | */ | |
3131 | static noinline int log_dir_items(struct btrfs_trans_handle *trans, | |
3132 | struct btrfs_root *root, struct inode *inode, | |
3133 | struct btrfs_path *path, | |
3134 | struct btrfs_path *dst_path, int key_type, | |
2f2ff0ee | 3135 | struct btrfs_log_ctx *ctx, |
e02119d5 CM |
3136 | u64 min_offset, u64 *last_offset_ret) |
3137 | { | |
3138 | struct btrfs_key min_key; | |
e02119d5 CM |
3139 | struct btrfs_root *log = root->log_root; |
3140 | struct extent_buffer *src; | |
4a500fd1 | 3141 | int err = 0; |
e02119d5 CM |
3142 | int ret; |
3143 | int i; | |
3144 | int nritems; | |
3145 | u64 first_offset = min_offset; | |
3146 | u64 last_offset = (u64)-1; | |
33345d01 | 3147 | u64 ino = btrfs_ino(inode); |
e02119d5 CM |
3148 | |
3149 | log = root->log_root; | |
e02119d5 | 3150 | |
33345d01 | 3151 | min_key.objectid = ino; |
e02119d5 CM |
3152 | min_key.type = key_type; |
3153 | min_key.offset = min_offset; | |
3154 | ||
6174d3cb | 3155 | ret = btrfs_search_forward(root, &min_key, path, trans->transid); |
e02119d5 CM |
3156 | |
3157 | /* | |
3158 | * we didn't find anything from this transaction, see if there | |
3159 | * is anything at all | |
3160 | */ | |
33345d01 LZ |
3161 | if (ret != 0 || min_key.objectid != ino || min_key.type != key_type) { |
3162 | min_key.objectid = ino; | |
e02119d5 CM |
3163 | min_key.type = key_type; |
3164 | min_key.offset = (u64)-1; | |
b3b4aa74 | 3165 | btrfs_release_path(path); |
e02119d5 CM |
3166 | ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0); |
3167 | if (ret < 0) { | |
b3b4aa74 | 3168 | btrfs_release_path(path); |
e02119d5 CM |
3169 | return ret; |
3170 | } | |
33345d01 | 3171 | ret = btrfs_previous_item(root, path, ino, key_type); |
e02119d5 CM |
3172 | |
3173 | /* if ret == 0 there are items for this type, | |
3174 | * create a range to tell us the last key of this type. | |
3175 | * otherwise, there are no items in this directory after | |
3176 | * *min_offset, and we create a range to indicate that. | |
3177 | */ | |
3178 | if (ret == 0) { | |
3179 | struct btrfs_key tmp; | |
3180 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, | |
3181 | path->slots[0]); | |
d397712b | 3182 | if (key_type == tmp.type) |
e02119d5 | 3183 | first_offset = max(min_offset, tmp.offset) + 1; |
e02119d5 CM |
3184 | } |
3185 | goto done; | |
3186 | } | |
3187 | ||
3188 | /* go backward to find any previous key */ | |
33345d01 | 3189 | ret = btrfs_previous_item(root, path, ino, key_type); |
e02119d5 CM |
3190 | if (ret == 0) { |
3191 | struct btrfs_key tmp; | |
3192 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); | |
3193 | if (key_type == tmp.type) { | |
3194 | first_offset = tmp.offset; | |
3195 | ret = overwrite_item(trans, log, dst_path, | |
3196 | path->nodes[0], path->slots[0], | |
3197 | &tmp); | |
4a500fd1 YZ |
3198 | if (ret) { |
3199 | err = ret; | |
3200 | goto done; | |
3201 | } | |
e02119d5 CM |
3202 | } |
3203 | } | |
b3b4aa74 | 3204 | btrfs_release_path(path); |
e02119d5 CM |
3205 | |
3206 | /* find the first key from this transaction again */ | |
3207 | ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0); | |
fae7f21c | 3208 | if (WARN_ON(ret != 0)) |
e02119d5 | 3209 | goto done; |
e02119d5 CM |
3210 | |
3211 | /* | |
3212 | * we have a block from this transaction, log every item in it | |
3213 | * from our directory | |
3214 | */ | |
d397712b | 3215 | while (1) { |
e02119d5 CM |
3216 | struct btrfs_key tmp; |
3217 | src = path->nodes[0]; | |
3218 | nritems = btrfs_header_nritems(src); | |
3219 | for (i = path->slots[0]; i < nritems; i++) { | |
2f2ff0ee FM |
3220 | struct btrfs_dir_item *di; |
3221 | ||
e02119d5 CM |
3222 | btrfs_item_key_to_cpu(src, &min_key, i); |
3223 | ||
33345d01 | 3224 | if (min_key.objectid != ino || min_key.type != key_type) |
e02119d5 CM |
3225 | goto done; |
3226 | ret = overwrite_item(trans, log, dst_path, src, i, | |
3227 | &min_key); | |
4a500fd1 YZ |
3228 | if (ret) { |
3229 | err = ret; | |
3230 | goto done; | |
3231 | } | |
2f2ff0ee FM |
3232 | |
3233 | /* | |
3234 | * We must make sure that when we log a directory entry, | |
3235 | * the corresponding inode, after log replay, has a | |
3236 | * matching link count. For example: | |
3237 | * | |
3238 | * touch foo | |
3239 | * mkdir mydir | |
3240 | * sync | |
3241 | * ln foo mydir/bar | |
3242 | * xfs_io -c "fsync" mydir | |
3243 | * <crash> | |
3244 | * <mount fs and log replay> | |
3245 | * | |
3246 | * Would result in a fsync log that when replayed, our | |
3247 | * file inode would have a link count of 1, but we get | |
3248 | * two directory entries pointing to the same inode. | |
3249 | * After removing one of the names, it would not be | |
3250 | * possible to remove the other name, which resulted | |
3251 | * always in stale file handle errors, and would not | |
3252 | * be possible to rmdir the parent directory, since | |
3253 | * its i_size could never decrement to the value | |
3254 | * BTRFS_EMPTY_DIR_SIZE, resulting in -ENOTEMPTY errors. | |
3255 | */ | |
3256 | di = btrfs_item_ptr(src, i, struct btrfs_dir_item); | |
3257 | btrfs_dir_item_key_to_cpu(src, di, &tmp); | |
3258 | if (ctx && | |
3259 | (btrfs_dir_transid(src, di) == trans->transid || | |
3260 | btrfs_dir_type(src, di) == BTRFS_FT_DIR) && | |
3261 | tmp.type != BTRFS_ROOT_ITEM_KEY) | |
3262 | ctx->log_new_dentries = true; | |
e02119d5 CM |
3263 | } |
3264 | path->slots[0] = nritems; | |
3265 | ||
3266 | /* | |
3267 | * look ahead to the next item and see if it is also | |
3268 | * from this directory and from this transaction | |
3269 | */ | |
3270 | ret = btrfs_next_leaf(root, path); | |
3271 | if (ret == 1) { | |
3272 | last_offset = (u64)-1; | |
3273 | goto done; | |
3274 | } | |
3275 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); | |
33345d01 | 3276 | if (tmp.objectid != ino || tmp.type != key_type) { |
e02119d5 CM |
3277 | last_offset = (u64)-1; |
3278 | goto done; | |
3279 | } | |
3280 | if (btrfs_header_generation(path->nodes[0]) != trans->transid) { | |
3281 | ret = overwrite_item(trans, log, dst_path, | |
3282 | path->nodes[0], path->slots[0], | |
3283 | &tmp); | |
4a500fd1 YZ |
3284 | if (ret) |
3285 | err = ret; | |
3286 | else | |
3287 | last_offset = tmp.offset; | |
e02119d5 CM |
3288 | goto done; |
3289 | } | |
3290 | } | |
3291 | done: | |
b3b4aa74 DS |
3292 | btrfs_release_path(path); |
3293 | btrfs_release_path(dst_path); | |
e02119d5 | 3294 | |
4a500fd1 YZ |
3295 | if (err == 0) { |
3296 | *last_offset_ret = last_offset; | |
3297 | /* | |
3298 | * insert the log range keys to indicate where the log | |
3299 | * is valid | |
3300 | */ | |
3301 | ret = insert_dir_log_key(trans, log, path, key_type, | |
33345d01 | 3302 | ino, first_offset, last_offset); |
4a500fd1 YZ |
3303 | if (ret) |
3304 | err = ret; | |
3305 | } | |
3306 | return err; | |
e02119d5 CM |
3307 | } |
3308 | ||
3309 | /* | |
3310 | * logging directories is very similar to logging inodes, We find all the items | |
3311 | * from the current transaction and write them to the log. | |
3312 | * | |
3313 | * The recovery code scans the directory in the subvolume, and if it finds a | |
3314 | * key in the range logged that is not present in the log tree, then it means | |
3315 | * that dir entry was unlinked during the transaction. | |
3316 | * | |
3317 | * In order for that scan to work, we must include one key smaller than | |
3318 | * the smallest logged by this transaction and one key larger than the largest | |
3319 | * key logged by this transaction. | |
3320 | */ | |
3321 | static noinline int log_directory_changes(struct btrfs_trans_handle *trans, | |
3322 | struct btrfs_root *root, struct inode *inode, | |
3323 | struct btrfs_path *path, | |
2f2ff0ee FM |
3324 | struct btrfs_path *dst_path, |
3325 | struct btrfs_log_ctx *ctx) | |
e02119d5 CM |
3326 | { |
3327 | u64 min_key; | |
3328 | u64 max_key; | |
3329 | int ret; | |
3330 | int key_type = BTRFS_DIR_ITEM_KEY; | |
3331 | ||
3332 | again: | |
3333 | min_key = 0; | |
3334 | max_key = 0; | |
d397712b | 3335 | while (1) { |
e02119d5 | 3336 | ret = log_dir_items(trans, root, inode, path, |
2f2ff0ee | 3337 | dst_path, key_type, ctx, min_key, |
e02119d5 | 3338 | &max_key); |
4a500fd1 YZ |
3339 | if (ret) |
3340 | return ret; | |
e02119d5 CM |
3341 | if (max_key == (u64)-1) |
3342 | break; | |
3343 | min_key = max_key + 1; | |
3344 | } | |
3345 | ||
3346 | if (key_type == BTRFS_DIR_ITEM_KEY) { | |
3347 | key_type = BTRFS_DIR_INDEX_KEY; | |
3348 | goto again; | |
3349 | } | |
3350 | return 0; | |
3351 | } | |
3352 | ||
3353 | /* | |
3354 | * a helper function to drop items from the log before we relog an | |
3355 | * inode. max_key_type indicates the highest item type to remove. | |
3356 | * This cannot be run for file data extents because it does not | |
3357 | * free the extents they point to. | |
3358 | */ | |
3359 | static int drop_objectid_items(struct btrfs_trans_handle *trans, | |
3360 | struct btrfs_root *log, | |
3361 | struct btrfs_path *path, | |
3362 | u64 objectid, int max_key_type) | |
3363 | { | |
3364 | int ret; | |
3365 | struct btrfs_key key; | |
3366 | struct btrfs_key found_key; | |
18ec90d6 | 3367 | int start_slot; |
e02119d5 CM |
3368 | |
3369 | key.objectid = objectid; | |
3370 | key.type = max_key_type; | |
3371 | key.offset = (u64)-1; | |
3372 | ||
d397712b | 3373 | while (1) { |
e02119d5 | 3374 | ret = btrfs_search_slot(trans, log, &key, path, -1, 1); |
3650860b | 3375 | BUG_ON(ret == 0); /* Logic error */ |
4a500fd1 | 3376 | if (ret < 0) |
e02119d5 CM |
3377 | break; |
3378 | ||
3379 | if (path->slots[0] == 0) | |
3380 | break; | |
3381 | ||
3382 | path->slots[0]--; | |
3383 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
3384 | path->slots[0]); | |
3385 | ||
3386 | if (found_key.objectid != objectid) | |
3387 | break; | |
3388 | ||
18ec90d6 JB |
3389 | found_key.offset = 0; |
3390 | found_key.type = 0; | |
3391 | ret = btrfs_bin_search(path->nodes[0], &found_key, 0, | |
3392 | &start_slot); | |
3393 | ||
3394 | ret = btrfs_del_items(trans, log, path, start_slot, | |
3395 | path->slots[0] - start_slot + 1); | |
3396 | /* | |
3397 | * If start slot isn't 0 then we don't need to re-search, we've | |
3398 | * found the last guy with the objectid in this tree. | |
3399 | */ | |
3400 | if (ret || start_slot != 0) | |
65a246c5 | 3401 | break; |
b3b4aa74 | 3402 | btrfs_release_path(path); |
e02119d5 | 3403 | } |
b3b4aa74 | 3404 | btrfs_release_path(path); |
5bdbeb21 JB |
3405 | if (ret > 0) |
3406 | ret = 0; | |
4a500fd1 | 3407 | return ret; |
e02119d5 CM |
3408 | } |
3409 | ||
94edf4ae JB |
3410 | static void fill_inode_item(struct btrfs_trans_handle *trans, |
3411 | struct extent_buffer *leaf, | |
3412 | struct btrfs_inode_item *item, | |
1a4bcf47 FM |
3413 | struct inode *inode, int log_inode_only, |
3414 | u64 logged_isize) | |
94edf4ae | 3415 | { |
0b1c6cca JB |
3416 | struct btrfs_map_token token; |
3417 | ||
3418 | btrfs_init_map_token(&token); | |
94edf4ae JB |
3419 | |
3420 | if (log_inode_only) { | |
3421 | /* set the generation to zero so the recover code | |
3422 | * can tell the difference between an logging | |
3423 | * just to say 'this inode exists' and a logging | |
3424 | * to say 'update this inode with these values' | |
3425 | */ | |
0b1c6cca | 3426 | btrfs_set_token_inode_generation(leaf, item, 0, &token); |
1a4bcf47 | 3427 | btrfs_set_token_inode_size(leaf, item, logged_isize, &token); |
94edf4ae | 3428 | } else { |
0b1c6cca JB |
3429 | btrfs_set_token_inode_generation(leaf, item, |
3430 | BTRFS_I(inode)->generation, | |
3431 | &token); | |
3432 | btrfs_set_token_inode_size(leaf, item, inode->i_size, &token); | |
3433 | } | |
3434 | ||
3435 | btrfs_set_token_inode_uid(leaf, item, i_uid_read(inode), &token); | |
3436 | btrfs_set_token_inode_gid(leaf, item, i_gid_read(inode), &token); | |
3437 | btrfs_set_token_inode_mode(leaf, item, inode->i_mode, &token); | |
3438 | btrfs_set_token_inode_nlink(leaf, item, inode->i_nlink, &token); | |
3439 | ||
a937b979 | 3440 | btrfs_set_token_timespec_sec(leaf, &item->atime, |
0b1c6cca | 3441 | inode->i_atime.tv_sec, &token); |
a937b979 | 3442 | btrfs_set_token_timespec_nsec(leaf, &item->atime, |
0b1c6cca JB |
3443 | inode->i_atime.tv_nsec, &token); |
3444 | ||
a937b979 | 3445 | btrfs_set_token_timespec_sec(leaf, &item->mtime, |
0b1c6cca | 3446 | inode->i_mtime.tv_sec, &token); |
a937b979 | 3447 | btrfs_set_token_timespec_nsec(leaf, &item->mtime, |
0b1c6cca JB |
3448 | inode->i_mtime.tv_nsec, &token); |
3449 | ||
a937b979 | 3450 | btrfs_set_token_timespec_sec(leaf, &item->ctime, |
0b1c6cca | 3451 | inode->i_ctime.tv_sec, &token); |
a937b979 | 3452 | btrfs_set_token_timespec_nsec(leaf, &item->ctime, |
0b1c6cca JB |
3453 | inode->i_ctime.tv_nsec, &token); |
3454 | ||
3455 | btrfs_set_token_inode_nbytes(leaf, item, inode_get_bytes(inode), | |
3456 | &token); | |
3457 | ||
3458 | btrfs_set_token_inode_sequence(leaf, item, inode->i_version, &token); | |
3459 | btrfs_set_token_inode_transid(leaf, item, trans->transid, &token); | |
3460 | btrfs_set_token_inode_rdev(leaf, item, inode->i_rdev, &token); | |
3461 | btrfs_set_token_inode_flags(leaf, item, BTRFS_I(inode)->flags, &token); | |
3462 | btrfs_set_token_inode_block_group(leaf, item, 0, &token); | |
94edf4ae JB |
3463 | } |
3464 | ||
a95249b3 JB |
3465 | static int log_inode_item(struct btrfs_trans_handle *trans, |
3466 | struct btrfs_root *log, struct btrfs_path *path, | |
3467 | struct inode *inode) | |
3468 | { | |
3469 | struct btrfs_inode_item *inode_item; | |
a95249b3 JB |
3470 | int ret; |
3471 | ||
efd0c405 FDBM |
3472 | ret = btrfs_insert_empty_item(trans, log, path, |
3473 | &BTRFS_I(inode)->location, | |
a95249b3 JB |
3474 | sizeof(*inode_item)); |
3475 | if (ret && ret != -EEXIST) | |
3476 | return ret; | |
3477 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3478 | struct btrfs_inode_item); | |
1a4bcf47 | 3479 | fill_inode_item(trans, path->nodes[0], inode_item, inode, 0, 0); |
a95249b3 JB |
3480 | btrfs_release_path(path); |
3481 | return 0; | |
3482 | } | |
3483 | ||
31ff1cd2 | 3484 | static noinline int copy_items(struct btrfs_trans_handle *trans, |
d2794405 | 3485 | struct inode *inode, |
31ff1cd2 | 3486 | struct btrfs_path *dst_path, |
16e7549f | 3487 | struct btrfs_path *src_path, u64 *last_extent, |
1a4bcf47 FM |
3488 | int start_slot, int nr, int inode_only, |
3489 | u64 logged_isize) | |
31ff1cd2 CM |
3490 | { |
3491 | unsigned long src_offset; | |
3492 | unsigned long dst_offset; | |
d2794405 | 3493 | struct btrfs_root *log = BTRFS_I(inode)->root->log_root; |
31ff1cd2 CM |
3494 | struct btrfs_file_extent_item *extent; |
3495 | struct btrfs_inode_item *inode_item; | |
16e7549f JB |
3496 | struct extent_buffer *src = src_path->nodes[0]; |
3497 | struct btrfs_key first_key, last_key, key; | |
31ff1cd2 CM |
3498 | int ret; |
3499 | struct btrfs_key *ins_keys; | |
3500 | u32 *ins_sizes; | |
3501 | char *ins_data; | |
3502 | int i; | |
d20f7043 | 3503 | struct list_head ordered_sums; |
d2794405 | 3504 | int skip_csum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
16e7549f | 3505 | bool has_extents = false; |
74121f7c | 3506 | bool need_find_last_extent = true; |
16e7549f | 3507 | bool done = false; |
d20f7043 CM |
3508 | |
3509 | INIT_LIST_HEAD(&ordered_sums); | |
31ff1cd2 CM |
3510 | |
3511 | ins_data = kmalloc(nr * sizeof(struct btrfs_key) + | |
3512 | nr * sizeof(u32), GFP_NOFS); | |
2a29edc6 | 3513 | if (!ins_data) |
3514 | return -ENOMEM; | |
3515 | ||
16e7549f JB |
3516 | first_key.objectid = (u64)-1; |
3517 | ||
31ff1cd2 CM |
3518 | ins_sizes = (u32 *)ins_data; |
3519 | ins_keys = (struct btrfs_key *)(ins_data + nr * sizeof(u32)); | |
3520 | ||
3521 | for (i = 0; i < nr; i++) { | |
3522 | ins_sizes[i] = btrfs_item_size_nr(src, i + start_slot); | |
3523 | btrfs_item_key_to_cpu(src, ins_keys + i, i + start_slot); | |
3524 | } | |
3525 | ret = btrfs_insert_empty_items(trans, log, dst_path, | |
3526 | ins_keys, ins_sizes, nr); | |
4a500fd1 YZ |
3527 | if (ret) { |
3528 | kfree(ins_data); | |
3529 | return ret; | |
3530 | } | |
31ff1cd2 | 3531 | |
5d4f98a2 | 3532 | for (i = 0; i < nr; i++, dst_path->slots[0]++) { |
31ff1cd2 CM |
3533 | dst_offset = btrfs_item_ptr_offset(dst_path->nodes[0], |
3534 | dst_path->slots[0]); | |
3535 | ||
3536 | src_offset = btrfs_item_ptr_offset(src, start_slot + i); | |
3537 | ||
16e7549f JB |
3538 | if ((i == (nr - 1))) |
3539 | last_key = ins_keys[i]; | |
3540 | ||
94edf4ae | 3541 | if (ins_keys[i].type == BTRFS_INODE_ITEM_KEY) { |
31ff1cd2 CM |
3542 | inode_item = btrfs_item_ptr(dst_path->nodes[0], |
3543 | dst_path->slots[0], | |
3544 | struct btrfs_inode_item); | |
94edf4ae | 3545 | fill_inode_item(trans, dst_path->nodes[0], inode_item, |
1a4bcf47 FM |
3546 | inode, inode_only == LOG_INODE_EXISTS, |
3547 | logged_isize); | |
94edf4ae JB |
3548 | } else { |
3549 | copy_extent_buffer(dst_path->nodes[0], src, dst_offset, | |
3550 | src_offset, ins_sizes[i]); | |
31ff1cd2 | 3551 | } |
94edf4ae | 3552 | |
16e7549f JB |
3553 | /* |
3554 | * We set need_find_last_extent here in case we know we were | |
3555 | * processing other items and then walk into the first extent in | |
3556 | * the inode. If we don't hit an extent then nothing changes, | |
3557 | * we'll do the last search the next time around. | |
3558 | */ | |
3559 | if (ins_keys[i].type == BTRFS_EXTENT_DATA_KEY) { | |
3560 | has_extents = true; | |
74121f7c | 3561 | if (first_key.objectid == (u64)-1) |
16e7549f JB |
3562 | first_key = ins_keys[i]; |
3563 | } else { | |
3564 | need_find_last_extent = false; | |
3565 | } | |
3566 | ||
31ff1cd2 CM |
3567 | /* take a reference on file data extents so that truncates |
3568 | * or deletes of this inode don't have to relog the inode | |
3569 | * again | |
3570 | */ | |
962a298f | 3571 | if (ins_keys[i].type == BTRFS_EXTENT_DATA_KEY && |
d2794405 | 3572 | !skip_csum) { |
31ff1cd2 CM |
3573 | int found_type; |
3574 | extent = btrfs_item_ptr(src, start_slot + i, | |
3575 | struct btrfs_file_extent_item); | |
3576 | ||
8e531cdf | 3577 | if (btrfs_file_extent_generation(src, extent) < trans->transid) |
3578 | continue; | |
3579 | ||
31ff1cd2 | 3580 | found_type = btrfs_file_extent_type(src, extent); |
6f1fed77 | 3581 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
5d4f98a2 YZ |
3582 | u64 ds, dl, cs, cl; |
3583 | ds = btrfs_file_extent_disk_bytenr(src, | |
3584 | extent); | |
3585 | /* ds == 0 is a hole */ | |
3586 | if (ds == 0) | |
3587 | continue; | |
3588 | ||
3589 | dl = btrfs_file_extent_disk_num_bytes(src, | |
3590 | extent); | |
3591 | cs = btrfs_file_extent_offset(src, extent); | |
3592 | cl = btrfs_file_extent_num_bytes(src, | |
a419aef8 | 3593 | extent); |
580afd76 CM |
3594 | if (btrfs_file_extent_compression(src, |
3595 | extent)) { | |
3596 | cs = 0; | |
3597 | cl = dl; | |
3598 | } | |
5d4f98a2 YZ |
3599 | |
3600 | ret = btrfs_lookup_csums_range( | |
3601 | log->fs_info->csum_root, | |
3602 | ds + cs, ds + cs + cl - 1, | |
a2de733c | 3603 | &ordered_sums, 0); |
3650860b JB |
3604 | if (ret) { |
3605 | btrfs_release_path(dst_path); | |
3606 | kfree(ins_data); | |
3607 | return ret; | |
3608 | } | |
31ff1cd2 CM |
3609 | } |
3610 | } | |
31ff1cd2 CM |
3611 | } |
3612 | ||
3613 | btrfs_mark_buffer_dirty(dst_path->nodes[0]); | |
b3b4aa74 | 3614 | btrfs_release_path(dst_path); |
31ff1cd2 | 3615 | kfree(ins_data); |
d20f7043 CM |
3616 | |
3617 | /* | |
3618 | * we have to do this after the loop above to avoid changing the | |
3619 | * log tree while trying to change the log tree. | |
3620 | */ | |
4a500fd1 | 3621 | ret = 0; |
d397712b | 3622 | while (!list_empty(&ordered_sums)) { |
d20f7043 CM |
3623 | struct btrfs_ordered_sum *sums = list_entry(ordered_sums.next, |
3624 | struct btrfs_ordered_sum, | |
3625 | list); | |
4a500fd1 YZ |
3626 | if (!ret) |
3627 | ret = btrfs_csum_file_blocks(trans, log, sums); | |
d20f7043 CM |
3628 | list_del(&sums->list); |
3629 | kfree(sums); | |
3630 | } | |
16e7549f JB |
3631 | |
3632 | if (!has_extents) | |
3633 | return ret; | |
3634 | ||
74121f7c FM |
3635 | if (need_find_last_extent && *last_extent == first_key.offset) { |
3636 | /* | |
3637 | * We don't have any leafs between our current one and the one | |
3638 | * we processed before that can have file extent items for our | |
3639 | * inode (and have a generation number smaller than our current | |
3640 | * transaction id). | |
3641 | */ | |
3642 | need_find_last_extent = false; | |
3643 | } | |
3644 | ||
16e7549f JB |
3645 | /* |
3646 | * Because we use btrfs_search_forward we could skip leaves that were | |
3647 | * not modified and then assume *last_extent is valid when it really | |
3648 | * isn't. So back up to the previous leaf and read the end of the last | |
3649 | * extent before we go and fill in holes. | |
3650 | */ | |
3651 | if (need_find_last_extent) { | |
3652 | u64 len; | |
3653 | ||
3654 | ret = btrfs_prev_leaf(BTRFS_I(inode)->root, src_path); | |
3655 | if (ret < 0) | |
3656 | return ret; | |
3657 | if (ret) | |
3658 | goto fill_holes; | |
3659 | if (src_path->slots[0]) | |
3660 | src_path->slots[0]--; | |
3661 | src = src_path->nodes[0]; | |
3662 | btrfs_item_key_to_cpu(src, &key, src_path->slots[0]); | |
3663 | if (key.objectid != btrfs_ino(inode) || | |
3664 | key.type != BTRFS_EXTENT_DATA_KEY) | |
3665 | goto fill_holes; | |
3666 | extent = btrfs_item_ptr(src, src_path->slots[0], | |
3667 | struct btrfs_file_extent_item); | |
3668 | if (btrfs_file_extent_type(src, extent) == | |
3669 | BTRFS_FILE_EXTENT_INLINE) { | |
514ac8ad CM |
3670 | len = btrfs_file_extent_inline_len(src, |
3671 | src_path->slots[0], | |
3672 | extent); | |
16e7549f JB |
3673 | *last_extent = ALIGN(key.offset + len, |
3674 | log->sectorsize); | |
3675 | } else { | |
3676 | len = btrfs_file_extent_num_bytes(src, extent); | |
3677 | *last_extent = key.offset + len; | |
3678 | } | |
3679 | } | |
3680 | fill_holes: | |
3681 | /* So we did prev_leaf, now we need to move to the next leaf, but a few | |
3682 | * things could have happened | |
3683 | * | |
3684 | * 1) A merge could have happened, so we could currently be on a leaf | |
3685 | * that holds what we were copying in the first place. | |
3686 | * 2) A split could have happened, and now not all of the items we want | |
3687 | * are on the same leaf. | |
3688 | * | |
3689 | * So we need to adjust how we search for holes, we need to drop the | |
3690 | * path and re-search for the first extent key we found, and then walk | |
3691 | * forward until we hit the last one we copied. | |
3692 | */ | |
3693 | if (need_find_last_extent) { | |
3694 | /* btrfs_prev_leaf could return 1 without releasing the path */ | |
3695 | btrfs_release_path(src_path); | |
3696 | ret = btrfs_search_slot(NULL, BTRFS_I(inode)->root, &first_key, | |
3697 | src_path, 0, 0); | |
3698 | if (ret < 0) | |
3699 | return ret; | |
3700 | ASSERT(ret == 0); | |
3701 | src = src_path->nodes[0]; | |
3702 | i = src_path->slots[0]; | |
3703 | } else { | |
3704 | i = start_slot; | |
3705 | } | |
3706 | ||
3707 | /* | |
3708 | * Ok so here we need to go through and fill in any holes we may have | |
3709 | * to make sure that holes are punched for those areas in case they had | |
3710 | * extents previously. | |
3711 | */ | |
3712 | while (!done) { | |
3713 | u64 offset, len; | |
3714 | u64 extent_end; | |
3715 | ||
3716 | if (i >= btrfs_header_nritems(src_path->nodes[0])) { | |
3717 | ret = btrfs_next_leaf(BTRFS_I(inode)->root, src_path); | |
3718 | if (ret < 0) | |
3719 | return ret; | |
3720 | ASSERT(ret == 0); | |
3721 | src = src_path->nodes[0]; | |
3722 | i = 0; | |
3723 | } | |
3724 | ||
3725 | btrfs_item_key_to_cpu(src, &key, i); | |
3726 | if (!btrfs_comp_cpu_keys(&key, &last_key)) | |
3727 | done = true; | |
3728 | if (key.objectid != btrfs_ino(inode) || | |
3729 | key.type != BTRFS_EXTENT_DATA_KEY) { | |
3730 | i++; | |
3731 | continue; | |
3732 | } | |
3733 | extent = btrfs_item_ptr(src, i, struct btrfs_file_extent_item); | |
3734 | if (btrfs_file_extent_type(src, extent) == | |
3735 | BTRFS_FILE_EXTENT_INLINE) { | |
514ac8ad | 3736 | len = btrfs_file_extent_inline_len(src, i, extent); |
16e7549f JB |
3737 | extent_end = ALIGN(key.offset + len, log->sectorsize); |
3738 | } else { | |
3739 | len = btrfs_file_extent_num_bytes(src, extent); | |
3740 | extent_end = key.offset + len; | |
3741 | } | |
3742 | i++; | |
3743 | ||
3744 | if (*last_extent == key.offset) { | |
3745 | *last_extent = extent_end; | |
3746 | continue; | |
3747 | } | |
3748 | offset = *last_extent; | |
3749 | len = key.offset - *last_extent; | |
3750 | ret = btrfs_insert_file_extent(trans, log, btrfs_ino(inode), | |
3751 | offset, 0, 0, len, 0, len, 0, | |
3752 | 0, 0); | |
3753 | if (ret) | |
3754 | break; | |
74121f7c | 3755 | *last_extent = extent_end; |
16e7549f JB |
3756 | } |
3757 | /* | |
3758 | * Need to let the callers know we dropped the path so they should | |
3759 | * re-search. | |
3760 | */ | |
3761 | if (!ret && need_find_last_extent) | |
3762 | ret = 1; | |
4a500fd1 | 3763 | return ret; |
31ff1cd2 CM |
3764 | } |
3765 | ||
5dc562c5 JB |
3766 | static int extent_cmp(void *priv, struct list_head *a, struct list_head *b) |
3767 | { | |
3768 | struct extent_map *em1, *em2; | |
3769 | ||
3770 | em1 = list_entry(a, struct extent_map, list); | |
3771 | em2 = list_entry(b, struct extent_map, list); | |
3772 | ||
3773 | if (em1->start < em2->start) | |
3774 | return -1; | |
3775 | else if (em1->start > em2->start) | |
3776 | return 1; | |
3777 | return 0; | |
3778 | } | |
3779 | ||
8407f553 FM |
3780 | static int wait_ordered_extents(struct btrfs_trans_handle *trans, |
3781 | struct inode *inode, | |
3782 | struct btrfs_root *root, | |
3783 | const struct extent_map *em, | |
3784 | const struct list_head *logged_list, | |
3785 | bool *ordered_io_error) | |
5dc562c5 | 3786 | { |
2ab28f32 | 3787 | struct btrfs_ordered_extent *ordered; |
8407f553 | 3788 | struct btrfs_root *log = root->log_root; |
2ab28f32 JB |
3789 | u64 mod_start = em->mod_start; |
3790 | u64 mod_len = em->mod_len; | |
8407f553 | 3791 | const bool skip_csum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
2ab28f32 JB |
3792 | u64 csum_offset; |
3793 | u64 csum_len; | |
8407f553 FM |
3794 | LIST_HEAD(ordered_sums); |
3795 | int ret = 0; | |
0aa4a17d | 3796 | |
8407f553 | 3797 | *ordered_io_error = false; |
0aa4a17d | 3798 | |
8407f553 FM |
3799 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) || |
3800 | em->block_start == EXTENT_MAP_HOLE) | |
70c8a91c | 3801 | return 0; |
5dc562c5 | 3802 | |
2ab28f32 | 3803 | /* |
8407f553 FM |
3804 | * Wait far any ordered extent that covers our extent map. If it |
3805 | * finishes without an error, first check and see if our csums are on | |
3806 | * our outstanding ordered extents. | |
2ab28f32 | 3807 | */ |
827463c4 | 3808 | list_for_each_entry(ordered, logged_list, log_list) { |
2ab28f32 JB |
3809 | struct btrfs_ordered_sum *sum; |
3810 | ||
3811 | if (!mod_len) | |
3812 | break; | |
3813 | ||
2ab28f32 JB |
3814 | if (ordered->file_offset + ordered->len <= mod_start || |
3815 | mod_start + mod_len <= ordered->file_offset) | |
3816 | continue; | |
3817 | ||
8407f553 FM |
3818 | if (!test_bit(BTRFS_ORDERED_IO_DONE, &ordered->flags) && |
3819 | !test_bit(BTRFS_ORDERED_IOERR, &ordered->flags) && | |
3820 | !test_bit(BTRFS_ORDERED_DIRECT, &ordered->flags)) { | |
3821 | const u64 start = ordered->file_offset; | |
3822 | const u64 end = ordered->file_offset + ordered->len - 1; | |
3823 | ||
3824 | WARN_ON(ordered->inode != inode); | |
3825 | filemap_fdatawrite_range(inode->i_mapping, start, end); | |
3826 | } | |
3827 | ||
3828 | wait_event(ordered->wait, | |
3829 | (test_bit(BTRFS_ORDERED_IO_DONE, &ordered->flags) || | |
3830 | test_bit(BTRFS_ORDERED_IOERR, &ordered->flags))); | |
3831 | ||
3832 | if (test_bit(BTRFS_ORDERED_IOERR, &ordered->flags)) { | |
b38ef71c FM |
3833 | /* |
3834 | * Clear the AS_EIO/AS_ENOSPC flags from the inode's | |
3835 | * i_mapping flags, so that the next fsync won't get | |
3836 | * an outdated io error too. | |
3837 | */ | |
3838 | btrfs_inode_check_errors(inode); | |
8407f553 FM |
3839 | *ordered_io_error = true; |
3840 | break; | |
3841 | } | |
2ab28f32 JB |
3842 | /* |
3843 | * We are going to copy all the csums on this ordered extent, so | |
3844 | * go ahead and adjust mod_start and mod_len in case this | |
3845 | * ordered extent has already been logged. | |
3846 | */ | |
3847 | if (ordered->file_offset > mod_start) { | |
3848 | if (ordered->file_offset + ordered->len >= | |
3849 | mod_start + mod_len) | |
3850 | mod_len = ordered->file_offset - mod_start; | |
3851 | /* | |
3852 | * If we have this case | |
3853 | * | |
3854 | * |--------- logged extent ---------| | |
3855 | * |----- ordered extent ----| | |
3856 | * | |
3857 | * Just don't mess with mod_start and mod_len, we'll | |
3858 | * just end up logging more csums than we need and it | |
3859 | * will be ok. | |
3860 | */ | |
3861 | } else { | |
3862 | if (ordered->file_offset + ordered->len < | |
3863 | mod_start + mod_len) { | |
3864 | mod_len = (mod_start + mod_len) - | |
3865 | (ordered->file_offset + ordered->len); | |
3866 | mod_start = ordered->file_offset + | |
3867 | ordered->len; | |
3868 | } else { | |
3869 | mod_len = 0; | |
3870 | } | |
3871 | } | |
3872 | ||
8407f553 FM |
3873 | if (skip_csum) |
3874 | continue; | |
3875 | ||
2ab28f32 JB |
3876 | /* |
3877 | * To keep us from looping for the above case of an ordered | |
3878 | * extent that falls inside of the logged extent. | |
3879 | */ | |
3880 | if (test_and_set_bit(BTRFS_ORDERED_LOGGED_CSUM, | |
3881 | &ordered->flags)) | |
3882 | continue; | |
2ab28f32 | 3883 | |
2ab28f32 JB |
3884 | list_for_each_entry(sum, &ordered->list, list) { |
3885 | ret = btrfs_csum_file_blocks(trans, log, sum); | |
827463c4 | 3886 | if (ret) |
8407f553 | 3887 | break; |
2ab28f32 | 3888 | } |
2ab28f32 | 3889 | } |
2ab28f32 | 3890 | |
8407f553 | 3891 | if (*ordered_io_error || !mod_len || ret || skip_csum) |
2ab28f32 JB |
3892 | return ret; |
3893 | ||
488111aa FDBM |
3894 | if (em->compress_type) { |
3895 | csum_offset = 0; | |
8407f553 | 3896 | csum_len = max(em->block_len, em->orig_block_len); |
488111aa FDBM |
3897 | } else { |
3898 | csum_offset = mod_start - em->start; | |
3899 | csum_len = mod_len; | |
3900 | } | |
2ab28f32 | 3901 | |
70c8a91c JB |
3902 | /* block start is already adjusted for the file extent offset. */ |
3903 | ret = btrfs_lookup_csums_range(log->fs_info->csum_root, | |
3904 | em->block_start + csum_offset, | |
3905 | em->block_start + csum_offset + | |
3906 | csum_len - 1, &ordered_sums, 0); | |
3907 | if (ret) | |
3908 | return ret; | |
5dc562c5 | 3909 | |
70c8a91c JB |
3910 | while (!list_empty(&ordered_sums)) { |
3911 | struct btrfs_ordered_sum *sums = list_entry(ordered_sums.next, | |
3912 | struct btrfs_ordered_sum, | |
3913 | list); | |
3914 | if (!ret) | |
3915 | ret = btrfs_csum_file_blocks(trans, log, sums); | |
3916 | list_del(&sums->list); | |
3917 | kfree(sums); | |
5dc562c5 JB |
3918 | } |
3919 | ||
70c8a91c | 3920 | return ret; |
5dc562c5 JB |
3921 | } |
3922 | ||
8407f553 FM |
3923 | static int log_one_extent(struct btrfs_trans_handle *trans, |
3924 | struct inode *inode, struct btrfs_root *root, | |
3925 | const struct extent_map *em, | |
3926 | struct btrfs_path *path, | |
3927 | const struct list_head *logged_list, | |
3928 | struct btrfs_log_ctx *ctx) | |
3929 | { | |
3930 | struct btrfs_root *log = root->log_root; | |
3931 | struct btrfs_file_extent_item *fi; | |
3932 | struct extent_buffer *leaf; | |
3933 | struct btrfs_map_token token; | |
3934 | struct btrfs_key key; | |
3935 | u64 extent_offset = em->start - em->orig_start; | |
3936 | u64 block_len; | |
3937 | int ret; | |
3938 | int extent_inserted = 0; | |
3939 | bool ordered_io_err = false; | |
3940 | ||
3941 | ret = wait_ordered_extents(trans, inode, root, em, logged_list, | |
3942 | &ordered_io_err); | |
3943 | if (ret) | |
3944 | return ret; | |
3945 | ||
3946 | if (ordered_io_err) { | |
3947 | ctx->io_err = -EIO; | |
3948 | return 0; | |
3949 | } | |
3950 | ||
3951 | btrfs_init_map_token(&token); | |
3952 | ||
3953 | ret = __btrfs_drop_extents(trans, log, inode, path, em->start, | |
3954 | em->start + em->len, NULL, 0, 1, | |
3955 | sizeof(*fi), &extent_inserted); | |
3956 | if (ret) | |
3957 | return ret; | |
3958 | ||
3959 | if (!extent_inserted) { | |
3960 | key.objectid = btrfs_ino(inode); | |
3961 | key.type = BTRFS_EXTENT_DATA_KEY; | |
3962 | key.offset = em->start; | |
3963 | ||
3964 | ret = btrfs_insert_empty_item(trans, log, path, &key, | |
3965 | sizeof(*fi)); | |
3966 | if (ret) | |
3967 | return ret; | |
3968 | } | |
3969 | leaf = path->nodes[0]; | |
3970 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
3971 | struct btrfs_file_extent_item); | |
3972 | ||
50d9aa99 | 3973 | btrfs_set_token_file_extent_generation(leaf, fi, trans->transid, |
8407f553 FM |
3974 | &token); |
3975 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) | |
3976 | btrfs_set_token_file_extent_type(leaf, fi, | |
3977 | BTRFS_FILE_EXTENT_PREALLOC, | |
3978 | &token); | |
3979 | else | |
3980 | btrfs_set_token_file_extent_type(leaf, fi, | |
3981 | BTRFS_FILE_EXTENT_REG, | |
3982 | &token); | |
3983 | ||
3984 | block_len = max(em->block_len, em->orig_block_len); | |
3985 | if (em->compress_type != BTRFS_COMPRESS_NONE) { | |
3986 | btrfs_set_token_file_extent_disk_bytenr(leaf, fi, | |
3987 | em->block_start, | |
3988 | &token); | |
3989 | btrfs_set_token_file_extent_disk_num_bytes(leaf, fi, block_len, | |
3990 | &token); | |
3991 | } else if (em->block_start < EXTENT_MAP_LAST_BYTE) { | |
3992 | btrfs_set_token_file_extent_disk_bytenr(leaf, fi, | |
3993 | em->block_start - | |
3994 | extent_offset, &token); | |
3995 | btrfs_set_token_file_extent_disk_num_bytes(leaf, fi, block_len, | |
3996 | &token); | |
3997 | } else { | |
3998 | btrfs_set_token_file_extent_disk_bytenr(leaf, fi, 0, &token); | |
3999 | btrfs_set_token_file_extent_disk_num_bytes(leaf, fi, 0, | |
4000 | &token); | |
4001 | } | |
4002 | ||
4003 | btrfs_set_token_file_extent_offset(leaf, fi, extent_offset, &token); | |
4004 | btrfs_set_token_file_extent_num_bytes(leaf, fi, em->len, &token); | |
4005 | btrfs_set_token_file_extent_ram_bytes(leaf, fi, em->ram_bytes, &token); | |
4006 | btrfs_set_token_file_extent_compression(leaf, fi, em->compress_type, | |
4007 | &token); | |
4008 | btrfs_set_token_file_extent_encryption(leaf, fi, 0, &token); | |
4009 | btrfs_set_token_file_extent_other_encoding(leaf, fi, 0, &token); | |
4010 | btrfs_mark_buffer_dirty(leaf); | |
4011 | ||
4012 | btrfs_release_path(path); | |
4013 | ||
4014 | return ret; | |
4015 | } | |
4016 | ||
5dc562c5 JB |
4017 | static int btrfs_log_changed_extents(struct btrfs_trans_handle *trans, |
4018 | struct btrfs_root *root, | |
4019 | struct inode *inode, | |
827463c4 | 4020 | struct btrfs_path *path, |
8407f553 FM |
4021 | struct list_head *logged_list, |
4022 | struct btrfs_log_ctx *ctx) | |
5dc562c5 | 4023 | { |
5dc562c5 JB |
4024 | struct extent_map *em, *n; |
4025 | struct list_head extents; | |
4026 | struct extent_map_tree *tree = &BTRFS_I(inode)->extent_tree; | |
4027 | u64 test_gen; | |
4028 | int ret = 0; | |
2ab28f32 | 4029 | int num = 0; |
5dc562c5 JB |
4030 | |
4031 | INIT_LIST_HEAD(&extents); | |
4032 | ||
5dc562c5 JB |
4033 | write_lock(&tree->lock); |
4034 | test_gen = root->fs_info->last_trans_committed; | |
4035 | ||
4036 | list_for_each_entry_safe(em, n, &tree->modified_extents, list) { | |
4037 | list_del_init(&em->list); | |
2ab28f32 JB |
4038 | |
4039 | /* | |
4040 | * Just an arbitrary number, this can be really CPU intensive | |
4041 | * once we start getting a lot of extents, and really once we | |
4042 | * have a bunch of extents we just want to commit since it will | |
4043 | * be faster. | |
4044 | */ | |
4045 | if (++num > 32768) { | |
4046 | list_del_init(&tree->modified_extents); | |
4047 | ret = -EFBIG; | |
4048 | goto process; | |
4049 | } | |
4050 | ||
5dc562c5 JB |
4051 | if (em->generation <= test_gen) |
4052 | continue; | |
ff44c6e3 JB |
4053 | /* Need a ref to keep it from getting evicted from cache */ |
4054 | atomic_inc(&em->refs); | |
4055 | set_bit(EXTENT_FLAG_LOGGING, &em->flags); | |
5dc562c5 | 4056 | list_add_tail(&em->list, &extents); |
2ab28f32 | 4057 | num++; |
5dc562c5 JB |
4058 | } |
4059 | ||
4060 | list_sort(NULL, &extents, extent_cmp); | |
4061 | ||
2ab28f32 | 4062 | process: |
5dc562c5 JB |
4063 | while (!list_empty(&extents)) { |
4064 | em = list_entry(extents.next, struct extent_map, list); | |
4065 | ||
4066 | list_del_init(&em->list); | |
4067 | ||
4068 | /* | |
4069 | * If we had an error we just need to delete everybody from our | |
4070 | * private list. | |
4071 | */ | |
ff44c6e3 | 4072 | if (ret) { |
201a9038 | 4073 | clear_em_logging(tree, em); |
ff44c6e3 | 4074 | free_extent_map(em); |
5dc562c5 | 4075 | continue; |
ff44c6e3 JB |
4076 | } |
4077 | ||
4078 | write_unlock(&tree->lock); | |
5dc562c5 | 4079 | |
8407f553 FM |
4080 | ret = log_one_extent(trans, inode, root, em, path, logged_list, |
4081 | ctx); | |
ff44c6e3 | 4082 | write_lock(&tree->lock); |
201a9038 JB |
4083 | clear_em_logging(tree, em); |
4084 | free_extent_map(em); | |
5dc562c5 | 4085 | } |
ff44c6e3 JB |
4086 | WARN_ON(!list_empty(&extents)); |
4087 | write_unlock(&tree->lock); | |
5dc562c5 | 4088 | |
5dc562c5 | 4089 | btrfs_release_path(path); |
5dc562c5 JB |
4090 | return ret; |
4091 | } | |
4092 | ||
1a4bcf47 FM |
4093 | static int logged_inode_size(struct btrfs_root *log, struct inode *inode, |
4094 | struct btrfs_path *path, u64 *size_ret) | |
4095 | { | |
4096 | struct btrfs_key key; | |
4097 | int ret; | |
4098 | ||
4099 | key.objectid = btrfs_ino(inode); | |
4100 | key.type = BTRFS_INODE_ITEM_KEY; | |
4101 | key.offset = 0; | |
4102 | ||
4103 | ret = btrfs_search_slot(NULL, log, &key, path, 0, 0); | |
4104 | if (ret < 0) { | |
4105 | return ret; | |
4106 | } else if (ret > 0) { | |
2f2ff0ee | 4107 | *size_ret = 0; |
1a4bcf47 FM |
4108 | } else { |
4109 | struct btrfs_inode_item *item; | |
4110 | ||
4111 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
4112 | struct btrfs_inode_item); | |
4113 | *size_ret = btrfs_inode_size(path->nodes[0], item); | |
4114 | } | |
4115 | ||
4116 | btrfs_release_path(path); | |
4117 | return 0; | |
4118 | } | |
4119 | ||
36283bf7 FM |
4120 | /* |
4121 | * At the moment we always log all xattrs. This is to figure out at log replay | |
4122 | * time which xattrs must have their deletion replayed. If a xattr is missing | |
4123 | * in the log tree and exists in the fs/subvol tree, we delete it. This is | |
4124 | * because if a xattr is deleted, the inode is fsynced and a power failure | |
4125 | * happens, causing the log to be replayed the next time the fs is mounted, | |
4126 | * we want the xattr to not exist anymore (same behaviour as other filesystems | |
4127 | * with a journal, ext3/4, xfs, f2fs, etc). | |
4128 | */ | |
4129 | static int btrfs_log_all_xattrs(struct btrfs_trans_handle *trans, | |
4130 | struct btrfs_root *root, | |
4131 | struct inode *inode, | |
4132 | struct btrfs_path *path, | |
4133 | struct btrfs_path *dst_path) | |
4134 | { | |
4135 | int ret; | |
4136 | struct btrfs_key key; | |
4137 | const u64 ino = btrfs_ino(inode); | |
4138 | int ins_nr = 0; | |
4139 | int start_slot = 0; | |
4140 | ||
4141 | key.objectid = ino; | |
4142 | key.type = BTRFS_XATTR_ITEM_KEY; | |
4143 | key.offset = 0; | |
4144 | ||
4145 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
4146 | if (ret < 0) | |
4147 | return ret; | |
4148 | ||
4149 | while (true) { | |
4150 | int slot = path->slots[0]; | |
4151 | struct extent_buffer *leaf = path->nodes[0]; | |
4152 | int nritems = btrfs_header_nritems(leaf); | |
4153 | ||
4154 | if (slot >= nritems) { | |
4155 | if (ins_nr > 0) { | |
4156 | u64 last_extent = 0; | |
4157 | ||
4158 | ret = copy_items(trans, inode, dst_path, path, | |
4159 | &last_extent, start_slot, | |
4160 | ins_nr, 1, 0); | |
4161 | /* can't be 1, extent items aren't processed */ | |
4162 | ASSERT(ret <= 0); | |
4163 | if (ret < 0) | |
4164 | return ret; | |
4165 | ins_nr = 0; | |
4166 | } | |
4167 | ret = btrfs_next_leaf(root, path); | |
4168 | if (ret < 0) | |
4169 | return ret; | |
4170 | else if (ret > 0) | |
4171 | break; | |
4172 | continue; | |
4173 | } | |
4174 | ||
4175 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
4176 | if (key.objectid != ino || key.type != BTRFS_XATTR_ITEM_KEY) | |
4177 | break; | |
4178 | ||
4179 | if (ins_nr == 0) | |
4180 | start_slot = slot; | |
4181 | ins_nr++; | |
4182 | path->slots[0]++; | |
4183 | cond_resched(); | |
4184 | } | |
4185 | if (ins_nr > 0) { | |
4186 | u64 last_extent = 0; | |
4187 | ||
4188 | ret = copy_items(trans, inode, dst_path, path, | |
4189 | &last_extent, start_slot, | |
4190 | ins_nr, 1, 0); | |
4191 | /* can't be 1, extent items aren't processed */ | |
4192 | ASSERT(ret <= 0); | |
4193 | if (ret < 0) | |
4194 | return ret; | |
4195 | } | |
4196 | ||
4197 | return 0; | |
4198 | } | |
4199 | ||
e02119d5 CM |
4200 | /* log a single inode in the tree log. |
4201 | * At least one parent directory for this inode must exist in the tree | |
4202 | * or be logged already. | |
4203 | * | |
4204 | * Any items from this inode changed by the current transaction are copied | |
4205 | * to the log tree. An extra reference is taken on any extents in this | |
4206 | * file, allowing us to avoid a whole pile of corner cases around logging | |
4207 | * blocks that have been removed from the tree. | |
4208 | * | |
4209 | * See LOG_INODE_ALL and related defines for a description of what inode_only | |
4210 | * does. | |
4211 | * | |
4212 | * This handles both files and directories. | |
4213 | */ | |
12fcfd22 | 4214 | static int btrfs_log_inode(struct btrfs_trans_handle *trans, |
49dae1bc FM |
4215 | struct btrfs_root *root, struct inode *inode, |
4216 | int inode_only, | |
4217 | const loff_t start, | |
8407f553 FM |
4218 | const loff_t end, |
4219 | struct btrfs_log_ctx *ctx) | |
e02119d5 CM |
4220 | { |
4221 | struct btrfs_path *path; | |
4222 | struct btrfs_path *dst_path; | |
4223 | struct btrfs_key min_key; | |
4224 | struct btrfs_key max_key; | |
4225 | struct btrfs_root *log = root->log_root; | |
31ff1cd2 | 4226 | struct extent_buffer *src = NULL; |
827463c4 | 4227 | LIST_HEAD(logged_list); |
16e7549f | 4228 | u64 last_extent = 0; |
4a500fd1 | 4229 | int err = 0; |
e02119d5 | 4230 | int ret; |
3a5f1d45 | 4231 | int nritems; |
31ff1cd2 CM |
4232 | int ins_start_slot = 0; |
4233 | int ins_nr; | |
5dc562c5 | 4234 | bool fast_search = false; |
33345d01 | 4235 | u64 ino = btrfs_ino(inode); |
49dae1bc | 4236 | struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
1a4bcf47 | 4237 | u64 logged_isize = 0; |
e4545de5 | 4238 | bool need_log_inode_item = true; |
e02119d5 | 4239 | |
e02119d5 | 4240 | path = btrfs_alloc_path(); |
5df67083 TI |
4241 | if (!path) |
4242 | return -ENOMEM; | |
e02119d5 | 4243 | dst_path = btrfs_alloc_path(); |
5df67083 TI |
4244 | if (!dst_path) { |
4245 | btrfs_free_path(path); | |
4246 | return -ENOMEM; | |
4247 | } | |
e02119d5 | 4248 | |
33345d01 | 4249 | min_key.objectid = ino; |
e02119d5 CM |
4250 | min_key.type = BTRFS_INODE_ITEM_KEY; |
4251 | min_key.offset = 0; | |
4252 | ||
33345d01 | 4253 | max_key.objectid = ino; |
12fcfd22 | 4254 | |
12fcfd22 | 4255 | |
5dc562c5 | 4256 | /* today the code can only do partial logging of directories */ |
5269b67e MX |
4257 | if (S_ISDIR(inode->i_mode) || |
4258 | (!test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
4259 | &BTRFS_I(inode)->runtime_flags) && | |
4260 | inode_only == LOG_INODE_EXISTS)) | |
e02119d5 CM |
4261 | max_key.type = BTRFS_XATTR_ITEM_KEY; |
4262 | else | |
4263 | max_key.type = (u8)-1; | |
4264 | max_key.offset = (u64)-1; | |
4265 | ||
2c2c452b FM |
4266 | /* |
4267 | * Only run delayed items if we are a dir or a new file. | |
4268 | * Otherwise commit the delayed inode only, which is needed in | |
4269 | * order for the log replay code to mark inodes for link count | |
4270 | * fixup (create temporary BTRFS_TREE_LOG_FIXUP_OBJECTID items). | |
4271 | */ | |
94edf4ae | 4272 | if (S_ISDIR(inode->i_mode) || |
2c2c452b | 4273 | BTRFS_I(inode)->generation > root->fs_info->last_trans_committed) |
94edf4ae | 4274 | ret = btrfs_commit_inode_delayed_items(trans, inode); |
2c2c452b FM |
4275 | else |
4276 | ret = btrfs_commit_inode_delayed_inode(inode); | |
4277 | ||
4278 | if (ret) { | |
4279 | btrfs_free_path(path); | |
4280 | btrfs_free_path(dst_path); | |
4281 | return ret; | |
16cdcec7 MX |
4282 | } |
4283 | ||
e02119d5 CM |
4284 | mutex_lock(&BTRFS_I(inode)->log_mutex); |
4285 | ||
0870295b | 4286 | btrfs_get_logged_extents(inode, &logged_list, start, end); |
2ab28f32 | 4287 | |
e02119d5 CM |
4288 | /* |
4289 | * a brute force approach to making sure we get the most uptodate | |
4290 | * copies of everything. | |
4291 | */ | |
4292 | if (S_ISDIR(inode->i_mode)) { | |
4293 | int max_key_type = BTRFS_DIR_LOG_INDEX_KEY; | |
4294 | ||
4f764e51 FM |
4295 | if (inode_only == LOG_INODE_EXISTS) |
4296 | max_key_type = BTRFS_XATTR_ITEM_KEY; | |
33345d01 | 4297 | ret = drop_objectid_items(trans, log, path, ino, max_key_type); |
e02119d5 | 4298 | } else { |
1a4bcf47 FM |
4299 | if (inode_only == LOG_INODE_EXISTS) { |
4300 | /* | |
4301 | * Make sure the new inode item we write to the log has | |
4302 | * the same isize as the current one (if it exists). | |
4303 | * This is necessary to prevent data loss after log | |
4304 | * replay, and also to prevent doing a wrong expanding | |
4305 | * truncate - for e.g. create file, write 4K into offset | |
4306 | * 0, fsync, write 4K into offset 4096, add hard link, | |
4307 | * fsync some other file (to sync log), power fail - if | |
4308 | * we use the inode's current i_size, after log replay | |
4309 | * we get a 8Kb file, with the last 4Kb extent as a hole | |
4310 | * (zeroes), as if an expanding truncate happened, | |
4311 | * instead of getting a file of 4Kb only. | |
4312 | */ | |
4313 | err = logged_inode_size(log, inode, path, | |
4314 | &logged_isize); | |
4315 | if (err) | |
4316 | goto out_unlock; | |
4317 | } | |
a742994a FM |
4318 | if (test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
4319 | &BTRFS_I(inode)->runtime_flags)) { | |
4320 | if (inode_only == LOG_INODE_EXISTS) { | |
4f764e51 | 4321 | max_key.type = BTRFS_XATTR_ITEM_KEY; |
a742994a FM |
4322 | ret = drop_objectid_items(trans, log, path, ino, |
4323 | max_key.type); | |
4324 | } else { | |
4325 | clear_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
4326 | &BTRFS_I(inode)->runtime_flags); | |
4327 | clear_bit(BTRFS_INODE_COPY_EVERYTHING, | |
4328 | &BTRFS_I(inode)->runtime_flags); | |
28ed1345 CM |
4329 | while(1) { |
4330 | ret = btrfs_truncate_inode_items(trans, | |
4331 | log, inode, 0, 0); | |
4332 | if (ret != -EAGAIN) | |
4333 | break; | |
4334 | } | |
a742994a | 4335 | } |
4f764e51 FM |
4336 | } else if (test_and_clear_bit(BTRFS_INODE_COPY_EVERYTHING, |
4337 | &BTRFS_I(inode)->runtime_flags) || | |
6cfab851 | 4338 | inode_only == LOG_INODE_EXISTS) { |
4f764e51 | 4339 | if (inode_only == LOG_INODE_ALL) |
183f37fa | 4340 | fast_search = true; |
4f764e51 | 4341 | max_key.type = BTRFS_XATTR_ITEM_KEY; |
5dc562c5 | 4342 | ret = drop_objectid_items(trans, log, path, ino, |
e9976151 | 4343 | max_key.type); |
a95249b3 JB |
4344 | } else { |
4345 | if (inode_only == LOG_INODE_ALL) | |
4346 | fast_search = true; | |
a95249b3 | 4347 | goto log_extents; |
5dc562c5 | 4348 | } |
a95249b3 | 4349 | |
e02119d5 | 4350 | } |
4a500fd1 YZ |
4351 | if (ret) { |
4352 | err = ret; | |
4353 | goto out_unlock; | |
4354 | } | |
e02119d5 | 4355 | |
d397712b | 4356 | while (1) { |
31ff1cd2 | 4357 | ins_nr = 0; |
6174d3cb | 4358 | ret = btrfs_search_forward(root, &min_key, |
de78b51a | 4359 | path, trans->transid); |
e02119d5 CM |
4360 | if (ret != 0) |
4361 | break; | |
3a5f1d45 | 4362 | again: |
31ff1cd2 | 4363 | /* note, ins_nr might be > 0 here, cleanup outside the loop */ |
33345d01 | 4364 | if (min_key.objectid != ino) |
e02119d5 CM |
4365 | break; |
4366 | if (min_key.type > max_key.type) | |
4367 | break; | |
31ff1cd2 | 4368 | |
e4545de5 FM |
4369 | if (min_key.type == BTRFS_INODE_ITEM_KEY) |
4370 | need_log_inode_item = false; | |
4371 | ||
36283bf7 FM |
4372 | /* Skip xattrs, we log them later with btrfs_log_all_xattrs() */ |
4373 | if (min_key.type == BTRFS_XATTR_ITEM_KEY) { | |
4374 | if (ins_nr == 0) | |
4375 | goto next_slot; | |
4376 | ret = copy_items(trans, inode, dst_path, path, | |
4377 | &last_extent, ins_start_slot, | |
4378 | ins_nr, inode_only, logged_isize); | |
4379 | if (ret < 0) { | |
4380 | err = ret; | |
4381 | goto out_unlock; | |
4382 | } | |
4383 | ins_nr = 0; | |
4384 | if (ret) { | |
4385 | btrfs_release_path(path); | |
4386 | continue; | |
4387 | } | |
4388 | goto next_slot; | |
4389 | } | |
4390 | ||
e02119d5 | 4391 | src = path->nodes[0]; |
31ff1cd2 CM |
4392 | if (ins_nr && ins_start_slot + ins_nr == path->slots[0]) { |
4393 | ins_nr++; | |
4394 | goto next_slot; | |
4395 | } else if (!ins_nr) { | |
4396 | ins_start_slot = path->slots[0]; | |
4397 | ins_nr = 1; | |
4398 | goto next_slot; | |
e02119d5 CM |
4399 | } |
4400 | ||
16e7549f | 4401 | ret = copy_items(trans, inode, dst_path, path, &last_extent, |
1a4bcf47 FM |
4402 | ins_start_slot, ins_nr, inode_only, |
4403 | logged_isize); | |
16e7549f | 4404 | if (ret < 0) { |
4a500fd1 YZ |
4405 | err = ret; |
4406 | goto out_unlock; | |
a71db86e RV |
4407 | } |
4408 | if (ret) { | |
16e7549f JB |
4409 | ins_nr = 0; |
4410 | btrfs_release_path(path); | |
4411 | continue; | |
4a500fd1 | 4412 | } |
31ff1cd2 CM |
4413 | ins_nr = 1; |
4414 | ins_start_slot = path->slots[0]; | |
4415 | next_slot: | |
e02119d5 | 4416 | |
3a5f1d45 CM |
4417 | nritems = btrfs_header_nritems(path->nodes[0]); |
4418 | path->slots[0]++; | |
4419 | if (path->slots[0] < nritems) { | |
4420 | btrfs_item_key_to_cpu(path->nodes[0], &min_key, | |
4421 | path->slots[0]); | |
4422 | goto again; | |
4423 | } | |
31ff1cd2 | 4424 | if (ins_nr) { |
16e7549f JB |
4425 | ret = copy_items(trans, inode, dst_path, path, |
4426 | &last_extent, ins_start_slot, | |
1a4bcf47 | 4427 | ins_nr, inode_only, logged_isize); |
16e7549f | 4428 | if (ret < 0) { |
4a500fd1 YZ |
4429 | err = ret; |
4430 | goto out_unlock; | |
4431 | } | |
16e7549f | 4432 | ret = 0; |
31ff1cd2 CM |
4433 | ins_nr = 0; |
4434 | } | |
b3b4aa74 | 4435 | btrfs_release_path(path); |
3a5f1d45 | 4436 | |
3d41d702 | 4437 | if (min_key.offset < (u64)-1) { |
e02119d5 | 4438 | min_key.offset++; |
3d41d702 | 4439 | } else if (min_key.type < max_key.type) { |
e02119d5 | 4440 | min_key.type++; |
3d41d702 FDBM |
4441 | min_key.offset = 0; |
4442 | } else { | |
e02119d5 | 4443 | break; |
3d41d702 | 4444 | } |
e02119d5 | 4445 | } |
31ff1cd2 | 4446 | if (ins_nr) { |
16e7549f | 4447 | ret = copy_items(trans, inode, dst_path, path, &last_extent, |
1a4bcf47 FM |
4448 | ins_start_slot, ins_nr, inode_only, |
4449 | logged_isize); | |
16e7549f | 4450 | if (ret < 0) { |
4a500fd1 YZ |
4451 | err = ret; |
4452 | goto out_unlock; | |
4453 | } | |
16e7549f | 4454 | ret = 0; |
31ff1cd2 CM |
4455 | ins_nr = 0; |
4456 | } | |
5dc562c5 | 4457 | |
36283bf7 FM |
4458 | btrfs_release_path(path); |
4459 | btrfs_release_path(dst_path); | |
4460 | err = btrfs_log_all_xattrs(trans, root, inode, path, dst_path); | |
4461 | if (err) | |
4462 | goto out_unlock; | |
a95249b3 | 4463 | log_extents: |
f3b15ccd JB |
4464 | btrfs_release_path(path); |
4465 | btrfs_release_path(dst_path); | |
e4545de5 FM |
4466 | if (need_log_inode_item) { |
4467 | err = log_inode_item(trans, log, dst_path, inode); | |
4468 | if (err) | |
4469 | goto out_unlock; | |
4470 | } | |
5dc562c5 | 4471 | if (fast_search) { |
b38ef71c FM |
4472 | /* |
4473 | * Some ordered extents started by fsync might have completed | |
4474 | * before we collected the ordered extents in logged_list, which | |
4475 | * means they're gone, not in our logged_list nor in the inode's | |
4476 | * ordered tree. We want the application/user space to know an | |
4477 | * error happened while attempting to persist file data so that | |
4478 | * it can take proper action. If such error happened, we leave | |
4479 | * without writing to the log tree and the fsync must report the | |
4480 | * file data write error and not commit the current transaction. | |
4481 | */ | |
4482 | err = btrfs_inode_check_errors(inode); | |
4483 | if (err) { | |
4484 | ctx->io_err = err; | |
4485 | goto out_unlock; | |
4486 | } | |
827463c4 | 4487 | ret = btrfs_log_changed_extents(trans, root, inode, dst_path, |
8407f553 | 4488 | &logged_list, ctx); |
5dc562c5 JB |
4489 | if (ret) { |
4490 | err = ret; | |
4491 | goto out_unlock; | |
4492 | } | |
d006a048 | 4493 | } else if (inode_only == LOG_INODE_ALL) { |
06d3d22b LB |
4494 | struct extent_map *em, *n; |
4495 | ||
49dae1bc FM |
4496 | write_lock(&em_tree->lock); |
4497 | /* | |
4498 | * We can't just remove every em if we're called for a ranged | |
4499 | * fsync - that is, one that doesn't cover the whole possible | |
4500 | * file range (0 to LLONG_MAX). This is because we can have | |
4501 | * em's that fall outside the range we're logging and therefore | |
4502 | * their ordered operations haven't completed yet | |
4503 | * (btrfs_finish_ordered_io() not invoked yet). This means we | |
4504 | * didn't get their respective file extent item in the fs/subvol | |
4505 | * tree yet, and need to let the next fast fsync (one which | |
4506 | * consults the list of modified extent maps) find the em so | |
4507 | * that it logs a matching file extent item and waits for the | |
4508 | * respective ordered operation to complete (if it's still | |
4509 | * running). | |
4510 | * | |
4511 | * Removing every em outside the range we're logging would make | |
4512 | * the next fast fsync not log their matching file extent items, | |
4513 | * therefore making us lose data after a log replay. | |
4514 | */ | |
4515 | list_for_each_entry_safe(em, n, &em_tree->modified_extents, | |
4516 | list) { | |
4517 | const u64 mod_end = em->mod_start + em->mod_len - 1; | |
4518 | ||
4519 | if (em->mod_start >= start && mod_end <= end) | |
4520 | list_del_init(&em->list); | |
4521 | } | |
4522 | write_unlock(&em_tree->lock); | |
5dc562c5 JB |
4523 | } |
4524 | ||
9623f9a3 | 4525 | if (inode_only == LOG_INODE_ALL && S_ISDIR(inode->i_mode)) { |
2f2ff0ee FM |
4526 | ret = log_directory_changes(trans, root, inode, path, dst_path, |
4527 | ctx); | |
4a500fd1 YZ |
4528 | if (ret) { |
4529 | err = ret; | |
4530 | goto out_unlock; | |
4531 | } | |
e02119d5 | 4532 | } |
49dae1bc | 4533 | |
2f2ff0ee | 4534 | spin_lock(&BTRFS_I(inode)->lock); |
125c4cf9 FM |
4535 | BTRFS_I(inode)->logged_trans = trans->transid; |
4536 | BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->last_sub_trans; | |
2f2ff0ee | 4537 | spin_unlock(&BTRFS_I(inode)->lock); |
4a500fd1 | 4538 | out_unlock: |
827463c4 MX |
4539 | if (unlikely(err)) |
4540 | btrfs_put_logged_extents(&logged_list); | |
4541 | else | |
4542 | btrfs_submit_logged_extents(&logged_list, log); | |
e02119d5 CM |
4543 | mutex_unlock(&BTRFS_I(inode)->log_mutex); |
4544 | ||
4545 | btrfs_free_path(path); | |
4546 | btrfs_free_path(dst_path); | |
4a500fd1 | 4547 | return err; |
e02119d5 CM |
4548 | } |
4549 | ||
12fcfd22 CM |
4550 | /* |
4551 | * follow the dentry parent pointers up the chain and see if any | |
4552 | * of the directories in it require a full commit before they can | |
4553 | * be logged. Returns zero if nothing special needs to be done or 1 if | |
4554 | * a full commit is required. | |
4555 | */ | |
4556 | static noinline int check_parent_dirs_for_sync(struct btrfs_trans_handle *trans, | |
4557 | struct inode *inode, | |
4558 | struct dentry *parent, | |
4559 | struct super_block *sb, | |
4560 | u64 last_committed) | |
e02119d5 | 4561 | { |
12fcfd22 CM |
4562 | int ret = 0; |
4563 | struct btrfs_root *root; | |
6a912213 | 4564 | struct dentry *old_parent = NULL; |
de2b530b | 4565 | struct inode *orig_inode = inode; |
e02119d5 | 4566 | |
af4176b4 CM |
4567 | /* |
4568 | * for regular files, if its inode is already on disk, we don't | |
4569 | * have to worry about the parents at all. This is because | |
4570 | * we can use the last_unlink_trans field to record renames | |
4571 | * and other fun in this file. | |
4572 | */ | |
4573 | if (S_ISREG(inode->i_mode) && | |
4574 | BTRFS_I(inode)->generation <= last_committed && | |
4575 | BTRFS_I(inode)->last_unlink_trans <= last_committed) | |
4576 | goto out; | |
4577 | ||
12fcfd22 | 4578 | if (!S_ISDIR(inode->i_mode)) { |
2b0143b5 | 4579 | if (!parent || d_really_is_negative(parent) || sb != d_inode(parent)->i_sb) |
12fcfd22 | 4580 | goto out; |
2b0143b5 | 4581 | inode = d_inode(parent); |
12fcfd22 CM |
4582 | } |
4583 | ||
4584 | while (1) { | |
de2b530b JB |
4585 | /* |
4586 | * If we are logging a directory then we start with our inode, | |
4587 | * not our parents inode, so we need to skipp setting the | |
4588 | * logged_trans so that further down in the log code we don't | |
4589 | * think this inode has already been logged. | |
4590 | */ | |
4591 | if (inode != orig_inode) | |
4592 | BTRFS_I(inode)->logged_trans = trans->transid; | |
12fcfd22 CM |
4593 | smp_mb(); |
4594 | ||
4595 | if (BTRFS_I(inode)->last_unlink_trans > last_committed) { | |
4596 | root = BTRFS_I(inode)->root; | |
4597 | ||
4598 | /* | |
4599 | * make sure any commits to the log are forced | |
4600 | * to be full commits | |
4601 | */ | |
995946dd | 4602 | btrfs_set_log_full_commit(root->fs_info, trans); |
12fcfd22 CM |
4603 | ret = 1; |
4604 | break; | |
4605 | } | |
4606 | ||
2b0143b5 | 4607 | if (!parent || d_really_is_negative(parent) || sb != d_inode(parent)->i_sb) |
12fcfd22 CM |
4608 | break; |
4609 | ||
76dda93c | 4610 | if (IS_ROOT(parent)) |
12fcfd22 CM |
4611 | break; |
4612 | ||
6a912213 JB |
4613 | parent = dget_parent(parent); |
4614 | dput(old_parent); | |
4615 | old_parent = parent; | |
2b0143b5 | 4616 | inode = d_inode(parent); |
12fcfd22 CM |
4617 | |
4618 | } | |
6a912213 | 4619 | dput(old_parent); |
12fcfd22 | 4620 | out: |
e02119d5 CM |
4621 | return ret; |
4622 | } | |
4623 | ||
2f2ff0ee FM |
4624 | struct btrfs_dir_list { |
4625 | u64 ino; | |
4626 | struct list_head list; | |
4627 | }; | |
4628 | ||
4629 | /* | |
4630 | * Log the inodes of the new dentries of a directory. See log_dir_items() for | |
4631 | * details about the why it is needed. | |
4632 | * This is a recursive operation - if an existing dentry corresponds to a | |
4633 | * directory, that directory's new entries are logged too (same behaviour as | |
4634 | * ext3/4, xfs, f2fs, reiserfs, nilfs2). Note that when logging the inodes | |
4635 | * the dentries point to we do not lock their i_mutex, otherwise lockdep | |
4636 | * complains about the following circular lock dependency / possible deadlock: | |
4637 | * | |
4638 | * CPU0 CPU1 | |
4639 | * ---- ---- | |
4640 | * lock(&type->i_mutex_dir_key#3/2); | |
4641 | * lock(sb_internal#2); | |
4642 | * lock(&type->i_mutex_dir_key#3/2); | |
4643 | * lock(&sb->s_type->i_mutex_key#14); | |
4644 | * | |
4645 | * Where sb_internal is the lock (a counter that works as a lock) acquired by | |
4646 | * sb_start_intwrite() in btrfs_start_transaction(). | |
4647 | * Not locking i_mutex of the inodes is still safe because: | |
4648 | * | |
4649 | * 1) For regular files we log with a mode of LOG_INODE_EXISTS. It's possible | |
4650 | * that while logging the inode new references (names) are added or removed | |
4651 | * from the inode, leaving the logged inode item with a link count that does | |
4652 | * not match the number of logged inode reference items. This is fine because | |
4653 | * at log replay time we compute the real number of links and correct the | |
4654 | * link count in the inode item (see replay_one_buffer() and | |
4655 | * link_to_fixup_dir()); | |
4656 | * | |
4657 | * 2) For directories we log with a mode of LOG_INODE_ALL. It's possible that | |
4658 | * while logging the inode's items new items with keys BTRFS_DIR_ITEM_KEY and | |
4659 | * BTRFS_DIR_INDEX_KEY are added to fs/subvol tree and the logged inode item | |
4660 | * has a size that doesn't match the sum of the lengths of all the logged | |
4661 | * names. This does not result in a problem because if a dir_item key is | |
4662 | * logged but its matching dir_index key is not logged, at log replay time we | |
4663 | * don't use it to replay the respective name (see replay_one_name()). On the | |
4664 | * other hand if only the dir_index key ends up being logged, the respective | |
4665 | * name is added to the fs/subvol tree with both the dir_item and dir_index | |
4666 | * keys created (see replay_one_name()). | |
4667 | * The directory's inode item with a wrong i_size is not a problem as well, | |
4668 | * since we don't use it at log replay time to set the i_size in the inode | |
4669 | * item of the fs/subvol tree (see overwrite_item()). | |
4670 | */ | |
4671 | static int log_new_dir_dentries(struct btrfs_trans_handle *trans, | |
4672 | struct btrfs_root *root, | |
4673 | struct inode *start_inode, | |
4674 | struct btrfs_log_ctx *ctx) | |
4675 | { | |
4676 | struct btrfs_root *log = root->log_root; | |
4677 | struct btrfs_path *path; | |
4678 | LIST_HEAD(dir_list); | |
4679 | struct btrfs_dir_list *dir_elem; | |
4680 | int ret = 0; | |
4681 | ||
4682 | path = btrfs_alloc_path(); | |
4683 | if (!path) | |
4684 | return -ENOMEM; | |
4685 | ||
4686 | dir_elem = kmalloc(sizeof(*dir_elem), GFP_NOFS); | |
4687 | if (!dir_elem) { | |
4688 | btrfs_free_path(path); | |
4689 | return -ENOMEM; | |
4690 | } | |
4691 | dir_elem->ino = btrfs_ino(start_inode); | |
4692 | list_add_tail(&dir_elem->list, &dir_list); | |
4693 | ||
4694 | while (!list_empty(&dir_list)) { | |
4695 | struct extent_buffer *leaf; | |
4696 | struct btrfs_key min_key; | |
4697 | int nritems; | |
4698 | int i; | |
4699 | ||
4700 | dir_elem = list_first_entry(&dir_list, struct btrfs_dir_list, | |
4701 | list); | |
4702 | if (ret) | |
4703 | goto next_dir_inode; | |
4704 | ||
4705 | min_key.objectid = dir_elem->ino; | |
4706 | min_key.type = BTRFS_DIR_ITEM_KEY; | |
4707 | min_key.offset = 0; | |
4708 | again: | |
4709 | btrfs_release_path(path); | |
4710 | ret = btrfs_search_forward(log, &min_key, path, trans->transid); | |
4711 | if (ret < 0) { | |
4712 | goto next_dir_inode; | |
4713 | } else if (ret > 0) { | |
4714 | ret = 0; | |
4715 | goto next_dir_inode; | |
4716 | } | |
4717 | ||
4718 | process_leaf: | |
4719 | leaf = path->nodes[0]; | |
4720 | nritems = btrfs_header_nritems(leaf); | |
4721 | for (i = path->slots[0]; i < nritems; i++) { | |
4722 | struct btrfs_dir_item *di; | |
4723 | struct btrfs_key di_key; | |
4724 | struct inode *di_inode; | |
4725 | struct btrfs_dir_list *new_dir_elem; | |
4726 | int log_mode = LOG_INODE_EXISTS; | |
4727 | int type; | |
4728 | ||
4729 | btrfs_item_key_to_cpu(leaf, &min_key, i); | |
4730 | if (min_key.objectid != dir_elem->ino || | |
4731 | min_key.type != BTRFS_DIR_ITEM_KEY) | |
4732 | goto next_dir_inode; | |
4733 | ||
4734 | di = btrfs_item_ptr(leaf, i, struct btrfs_dir_item); | |
4735 | type = btrfs_dir_type(leaf, di); | |
4736 | if (btrfs_dir_transid(leaf, di) < trans->transid && | |
4737 | type != BTRFS_FT_DIR) | |
4738 | continue; | |
4739 | btrfs_dir_item_key_to_cpu(leaf, di, &di_key); | |
4740 | if (di_key.type == BTRFS_ROOT_ITEM_KEY) | |
4741 | continue; | |
4742 | ||
4743 | di_inode = btrfs_iget(root->fs_info->sb, &di_key, | |
4744 | root, NULL); | |
4745 | if (IS_ERR(di_inode)) { | |
4746 | ret = PTR_ERR(di_inode); | |
4747 | goto next_dir_inode; | |
4748 | } | |
4749 | ||
4750 | if (btrfs_inode_in_log(di_inode, trans->transid)) { | |
4751 | iput(di_inode); | |
4752 | continue; | |
4753 | } | |
4754 | ||
4755 | ctx->log_new_dentries = false; | |
4756 | if (type == BTRFS_FT_DIR) | |
4757 | log_mode = LOG_INODE_ALL; | |
4758 | btrfs_release_path(path); | |
4759 | ret = btrfs_log_inode(trans, root, di_inode, | |
4760 | log_mode, 0, LLONG_MAX, ctx); | |
4761 | iput(di_inode); | |
4762 | if (ret) | |
4763 | goto next_dir_inode; | |
4764 | if (ctx->log_new_dentries) { | |
4765 | new_dir_elem = kmalloc(sizeof(*new_dir_elem), | |
4766 | GFP_NOFS); | |
4767 | if (!new_dir_elem) { | |
4768 | ret = -ENOMEM; | |
4769 | goto next_dir_inode; | |
4770 | } | |
4771 | new_dir_elem->ino = di_key.objectid; | |
4772 | list_add_tail(&new_dir_elem->list, &dir_list); | |
4773 | } | |
4774 | break; | |
4775 | } | |
4776 | if (i == nritems) { | |
4777 | ret = btrfs_next_leaf(log, path); | |
4778 | if (ret < 0) { | |
4779 | goto next_dir_inode; | |
4780 | } else if (ret > 0) { | |
4781 | ret = 0; | |
4782 | goto next_dir_inode; | |
4783 | } | |
4784 | goto process_leaf; | |
4785 | } | |
4786 | if (min_key.offset < (u64)-1) { | |
4787 | min_key.offset++; | |
4788 | goto again; | |
4789 | } | |
4790 | next_dir_inode: | |
4791 | list_del(&dir_elem->list); | |
4792 | kfree(dir_elem); | |
4793 | } | |
4794 | ||
4795 | btrfs_free_path(path); | |
4796 | return ret; | |
4797 | } | |
4798 | ||
e02119d5 CM |
4799 | /* |
4800 | * helper function around btrfs_log_inode to make sure newly created | |
4801 | * parent directories also end up in the log. A minimal inode and backref | |
4802 | * only logging is done of any parent directories that are older than | |
4803 | * the last committed transaction | |
4804 | */ | |
48a3b636 ES |
4805 | static int btrfs_log_inode_parent(struct btrfs_trans_handle *trans, |
4806 | struct btrfs_root *root, struct inode *inode, | |
49dae1bc FM |
4807 | struct dentry *parent, |
4808 | const loff_t start, | |
4809 | const loff_t end, | |
4810 | int exists_only, | |
8b050d35 | 4811 | struct btrfs_log_ctx *ctx) |
e02119d5 | 4812 | { |
12fcfd22 | 4813 | int inode_only = exists_only ? LOG_INODE_EXISTS : LOG_INODE_ALL; |
e02119d5 | 4814 | struct super_block *sb; |
6a912213 | 4815 | struct dentry *old_parent = NULL; |
12fcfd22 CM |
4816 | int ret = 0; |
4817 | u64 last_committed = root->fs_info->last_trans_committed; | |
d36808e0 FM |
4818 | const struct dentry * const first_parent = parent; |
4819 | const bool did_unlink = (BTRFS_I(inode)->last_unlink_trans > | |
4820 | last_committed); | |
2f2ff0ee FM |
4821 | bool log_dentries = false; |
4822 | struct inode *orig_inode = inode; | |
12fcfd22 CM |
4823 | |
4824 | sb = inode->i_sb; | |
4825 | ||
3a5e1404 SW |
4826 | if (btrfs_test_opt(root, NOTREELOG)) { |
4827 | ret = 1; | |
4828 | goto end_no_trans; | |
4829 | } | |
4830 | ||
995946dd MX |
4831 | /* |
4832 | * The prev transaction commit doesn't complete, we need do | |
4833 | * full commit by ourselves. | |
4834 | */ | |
12fcfd22 CM |
4835 | if (root->fs_info->last_trans_log_full_commit > |
4836 | root->fs_info->last_trans_committed) { | |
4837 | ret = 1; | |
4838 | goto end_no_trans; | |
4839 | } | |
4840 | ||
76dda93c YZ |
4841 | if (root != BTRFS_I(inode)->root || |
4842 | btrfs_root_refs(&root->root_item) == 0) { | |
4843 | ret = 1; | |
4844 | goto end_no_trans; | |
4845 | } | |
4846 | ||
12fcfd22 CM |
4847 | ret = check_parent_dirs_for_sync(trans, inode, parent, |
4848 | sb, last_committed); | |
4849 | if (ret) | |
4850 | goto end_no_trans; | |
e02119d5 | 4851 | |
22ee6985 | 4852 | if (btrfs_inode_in_log(inode, trans->transid)) { |
257c62e1 CM |
4853 | ret = BTRFS_NO_LOG_SYNC; |
4854 | goto end_no_trans; | |
4855 | } | |
4856 | ||
8b050d35 | 4857 | ret = start_log_trans(trans, root, ctx); |
4a500fd1 | 4858 | if (ret) |
e87ac136 | 4859 | goto end_no_trans; |
e02119d5 | 4860 | |
8407f553 | 4861 | ret = btrfs_log_inode(trans, root, inode, inode_only, start, end, ctx); |
4a500fd1 YZ |
4862 | if (ret) |
4863 | goto end_trans; | |
12fcfd22 | 4864 | |
af4176b4 CM |
4865 | /* |
4866 | * for regular files, if its inode is already on disk, we don't | |
4867 | * have to worry about the parents at all. This is because | |
4868 | * we can use the last_unlink_trans field to record renames | |
4869 | * and other fun in this file. | |
4870 | */ | |
4871 | if (S_ISREG(inode->i_mode) && | |
4872 | BTRFS_I(inode)->generation <= last_committed && | |
4a500fd1 YZ |
4873 | BTRFS_I(inode)->last_unlink_trans <= last_committed) { |
4874 | ret = 0; | |
4875 | goto end_trans; | |
4876 | } | |
af4176b4 | 4877 | |
2f2ff0ee FM |
4878 | if (S_ISDIR(inode->i_mode) && ctx && ctx->log_new_dentries) |
4879 | log_dentries = true; | |
4880 | ||
12fcfd22 | 4881 | while (1) { |
2b0143b5 | 4882 | if (!parent || d_really_is_negative(parent) || sb != d_inode(parent)->i_sb) |
e02119d5 CM |
4883 | break; |
4884 | ||
2b0143b5 | 4885 | inode = d_inode(parent); |
76dda93c YZ |
4886 | if (root != BTRFS_I(inode)->root) |
4887 | break; | |
4888 | ||
d36808e0 FM |
4889 | /* |
4890 | * On unlink we must make sure our immediate parent directory | |
4891 | * inode is fully logged. This is to prevent leaving dangling | |
4892 | * directory index entries and a wrong directory inode's i_size. | |
4893 | * Not doing so can result in a directory being impossible to | |
4894 | * delete after log replay (rmdir will always fail with error | |
4895 | * -ENOTEMPTY). | |
4896 | */ | |
4897 | if (did_unlink && parent == first_parent) | |
4898 | inode_only = LOG_INODE_ALL; | |
4899 | else | |
4900 | inode_only = LOG_INODE_EXISTS; | |
4901 | ||
12fcfd22 | 4902 | if (BTRFS_I(inode)->generation > |
d36808e0 FM |
4903 | root->fs_info->last_trans_committed || |
4904 | inode_only == LOG_INODE_ALL) { | |
49dae1bc | 4905 | ret = btrfs_log_inode(trans, root, inode, inode_only, |
8407f553 | 4906 | 0, LLONG_MAX, ctx); |
4a500fd1 YZ |
4907 | if (ret) |
4908 | goto end_trans; | |
12fcfd22 | 4909 | } |
76dda93c | 4910 | if (IS_ROOT(parent)) |
e02119d5 | 4911 | break; |
12fcfd22 | 4912 | |
6a912213 JB |
4913 | parent = dget_parent(parent); |
4914 | dput(old_parent); | |
4915 | old_parent = parent; | |
e02119d5 | 4916 | } |
2f2ff0ee FM |
4917 | if (log_dentries) |
4918 | ret = log_new_dir_dentries(trans, root, orig_inode, ctx); | |
4919 | else | |
4920 | ret = 0; | |
4a500fd1 | 4921 | end_trans: |
6a912213 | 4922 | dput(old_parent); |
4a500fd1 | 4923 | if (ret < 0) { |
995946dd | 4924 | btrfs_set_log_full_commit(root->fs_info, trans); |
4a500fd1 YZ |
4925 | ret = 1; |
4926 | } | |
8b050d35 MX |
4927 | |
4928 | if (ret) | |
4929 | btrfs_remove_log_ctx(root, ctx); | |
12fcfd22 CM |
4930 | btrfs_end_log_trans(root); |
4931 | end_no_trans: | |
4932 | return ret; | |
e02119d5 CM |
4933 | } |
4934 | ||
4935 | /* | |
4936 | * it is not safe to log dentry if the chunk root has added new | |
4937 | * chunks. This returns 0 if the dentry was logged, and 1 otherwise. | |
4938 | * If this returns 1, you must commit the transaction to safely get your | |
4939 | * data on disk. | |
4940 | */ | |
4941 | int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans, | |
8b050d35 | 4942 | struct btrfs_root *root, struct dentry *dentry, |
49dae1bc FM |
4943 | const loff_t start, |
4944 | const loff_t end, | |
8b050d35 | 4945 | struct btrfs_log_ctx *ctx) |
e02119d5 | 4946 | { |
6a912213 JB |
4947 | struct dentry *parent = dget_parent(dentry); |
4948 | int ret; | |
4949 | ||
2b0143b5 | 4950 | ret = btrfs_log_inode_parent(trans, root, d_inode(dentry), parent, |
49dae1bc | 4951 | start, end, 0, ctx); |
6a912213 JB |
4952 | dput(parent); |
4953 | ||
4954 | return ret; | |
e02119d5 CM |
4955 | } |
4956 | ||
4957 | /* | |
4958 | * should be called during mount to recover any replay any log trees | |
4959 | * from the FS | |
4960 | */ | |
4961 | int btrfs_recover_log_trees(struct btrfs_root *log_root_tree) | |
4962 | { | |
4963 | int ret; | |
4964 | struct btrfs_path *path; | |
4965 | struct btrfs_trans_handle *trans; | |
4966 | struct btrfs_key key; | |
4967 | struct btrfs_key found_key; | |
4968 | struct btrfs_key tmp_key; | |
4969 | struct btrfs_root *log; | |
4970 | struct btrfs_fs_info *fs_info = log_root_tree->fs_info; | |
4971 | struct walk_control wc = { | |
4972 | .process_func = process_one_buffer, | |
4973 | .stage = 0, | |
4974 | }; | |
4975 | ||
e02119d5 | 4976 | path = btrfs_alloc_path(); |
db5b493a TI |
4977 | if (!path) |
4978 | return -ENOMEM; | |
4979 | ||
4980 | fs_info->log_root_recovering = 1; | |
e02119d5 | 4981 | |
4a500fd1 | 4982 | trans = btrfs_start_transaction(fs_info->tree_root, 0); |
79787eaa JM |
4983 | if (IS_ERR(trans)) { |
4984 | ret = PTR_ERR(trans); | |
4985 | goto error; | |
4986 | } | |
e02119d5 CM |
4987 | |
4988 | wc.trans = trans; | |
4989 | wc.pin = 1; | |
4990 | ||
db5b493a | 4991 | ret = walk_log_tree(trans, log_root_tree, &wc); |
79787eaa JM |
4992 | if (ret) { |
4993 | btrfs_error(fs_info, ret, "Failed to pin buffers while " | |
4994 | "recovering log root tree."); | |
4995 | goto error; | |
4996 | } | |
e02119d5 CM |
4997 | |
4998 | again: | |
4999 | key.objectid = BTRFS_TREE_LOG_OBJECTID; | |
5000 | key.offset = (u64)-1; | |
962a298f | 5001 | key.type = BTRFS_ROOT_ITEM_KEY; |
e02119d5 | 5002 | |
d397712b | 5003 | while (1) { |
e02119d5 | 5004 | ret = btrfs_search_slot(NULL, log_root_tree, &key, path, 0, 0); |
79787eaa JM |
5005 | |
5006 | if (ret < 0) { | |
5007 | btrfs_error(fs_info, ret, | |
5008 | "Couldn't find tree log root."); | |
5009 | goto error; | |
5010 | } | |
e02119d5 CM |
5011 | if (ret > 0) { |
5012 | if (path->slots[0] == 0) | |
5013 | break; | |
5014 | path->slots[0]--; | |
5015 | } | |
5016 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
5017 | path->slots[0]); | |
b3b4aa74 | 5018 | btrfs_release_path(path); |
e02119d5 CM |
5019 | if (found_key.objectid != BTRFS_TREE_LOG_OBJECTID) |
5020 | break; | |
5021 | ||
cb517eab | 5022 | log = btrfs_read_fs_root(log_root_tree, &found_key); |
79787eaa JM |
5023 | if (IS_ERR(log)) { |
5024 | ret = PTR_ERR(log); | |
5025 | btrfs_error(fs_info, ret, | |
5026 | "Couldn't read tree log root."); | |
5027 | goto error; | |
5028 | } | |
e02119d5 CM |
5029 | |
5030 | tmp_key.objectid = found_key.offset; | |
5031 | tmp_key.type = BTRFS_ROOT_ITEM_KEY; | |
5032 | tmp_key.offset = (u64)-1; | |
5033 | ||
5034 | wc.replay_dest = btrfs_read_fs_root_no_name(fs_info, &tmp_key); | |
79787eaa JM |
5035 | if (IS_ERR(wc.replay_dest)) { |
5036 | ret = PTR_ERR(wc.replay_dest); | |
b50c6e25 JB |
5037 | free_extent_buffer(log->node); |
5038 | free_extent_buffer(log->commit_root); | |
5039 | kfree(log); | |
79787eaa JM |
5040 | btrfs_error(fs_info, ret, "Couldn't read target root " |
5041 | "for tree log recovery."); | |
5042 | goto error; | |
5043 | } | |
e02119d5 | 5044 | |
07d400a6 | 5045 | wc.replay_dest->log_root = log; |
5d4f98a2 | 5046 | btrfs_record_root_in_trans(trans, wc.replay_dest); |
e02119d5 | 5047 | ret = walk_log_tree(trans, log, &wc); |
e02119d5 | 5048 | |
b50c6e25 | 5049 | if (!ret && wc.stage == LOG_WALK_REPLAY_ALL) { |
e02119d5 CM |
5050 | ret = fixup_inode_link_counts(trans, wc.replay_dest, |
5051 | path); | |
e02119d5 CM |
5052 | } |
5053 | ||
5054 | key.offset = found_key.offset - 1; | |
07d400a6 | 5055 | wc.replay_dest->log_root = NULL; |
e02119d5 | 5056 | free_extent_buffer(log->node); |
b263c2c8 | 5057 | free_extent_buffer(log->commit_root); |
e02119d5 CM |
5058 | kfree(log); |
5059 | ||
b50c6e25 JB |
5060 | if (ret) |
5061 | goto error; | |
5062 | ||
e02119d5 CM |
5063 | if (found_key.offset == 0) |
5064 | break; | |
5065 | } | |
b3b4aa74 | 5066 | btrfs_release_path(path); |
e02119d5 CM |
5067 | |
5068 | /* step one is to pin it all, step two is to replay just inodes */ | |
5069 | if (wc.pin) { | |
5070 | wc.pin = 0; | |
5071 | wc.process_func = replay_one_buffer; | |
5072 | wc.stage = LOG_WALK_REPLAY_INODES; | |
5073 | goto again; | |
5074 | } | |
5075 | /* step three is to replay everything */ | |
5076 | if (wc.stage < LOG_WALK_REPLAY_ALL) { | |
5077 | wc.stage++; | |
5078 | goto again; | |
5079 | } | |
5080 | ||
5081 | btrfs_free_path(path); | |
5082 | ||
abefa55a JB |
5083 | /* step 4: commit the transaction, which also unpins the blocks */ |
5084 | ret = btrfs_commit_transaction(trans, fs_info->tree_root); | |
5085 | if (ret) | |
5086 | return ret; | |
5087 | ||
e02119d5 CM |
5088 | free_extent_buffer(log_root_tree->node); |
5089 | log_root_tree->log_root = NULL; | |
5090 | fs_info->log_root_recovering = 0; | |
e02119d5 | 5091 | kfree(log_root_tree); |
79787eaa | 5092 | |
abefa55a | 5093 | return 0; |
79787eaa | 5094 | error: |
b50c6e25 JB |
5095 | if (wc.trans) |
5096 | btrfs_end_transaction(wc.trans, fs_info->tree_root); | |
79787eaa JM |
5097 | btrfs_free_path(path); |
5098 | return ret; | |
e02119d5 | 5099 | } |
12fcfd22 CM |
5100 | |
5101 | /* | |
5102 | * there are some corner cases where we want to force a full | |
5103 | * commit instead of allowing a directory to be logged. | |
5104 | * | |
5105 | * They revolve around files there were unlinked from the directory, and | |
5106 | * this function updates the parent directory so that a full commit is | |
5107 | * properly done if it is fsync'd later after the unlinks are done. | |
5108 | */ | |
5109 | void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans, | |
5110 | struct inode *dir, struct inode *inode, | |
5111 | int for_rename) | |
5112 | { | |
af4176b4 CM |
5113 | /* |
5114 | * when we're logging a file, if it hasn't been renamed | |
5115 | * or unlinked, and its inode is fully committed on disk, | |
5116 | * we don't have to worry about walking up the directory chain | |
5117 | * to log its parents. | |
5118 | * | |
5119 | * So, we use the last_unlink_trans field to put this transid | |
5120 | * into the file. When the file is logged we check it and | |
5121 | * don't log the parents if the file is fully on disk. | |
5122 | */ | |
5123 | if (S_ISREG(inode->i_mode)) | |
5124 | BTRFS_I(inode)->last_unlink_trans = trans->transid; | |
5125 | ||
12fcfd22 CM |
5126 | /* |
5127 | * if this directory was already logged any new | |
5128 | * names for this file/dir will get recorded | |
5129 | */ | |
5130 | smp_mb(); | |
5131 | if (BTRFS_I(dir)->logged_trans == trans->transid) | |
5132 | return; | |
5133 | ||
5134 | /* | |
5135 | * if the inode we're about to unlink was logged, | |
5136 | * the log will be properly updated for any new names | |
5137 | */ | |
5138 | if (BTRFS_I(inode)->logged_trans == trans->transid) | |
5139 | return; | |
5140 | ||
5141 | /* | |
5142 | * when renaming files across directories, if the directory | |
5143 | * there we're unlinking from gets fsync'd later on, there's | |
5144 | * no way to find the destination directory later and fsync it | |
5145 | * properly. So, we have to be conservative and force commits | |
5146 | * so the new name gets discovered. | |
5147 | */ | |
5148 | if (for_rename) | |
5149 | goto record; | |
5150 | ||
5151 | /* we can safely do the unlink without any special recording */ | |
5152 | return; | |
5153 | ||
5154 | record: | |
5155 | BTRFS_I(dir)->last_unlink_trans = trans->transid; | |
5156 | } | |
5157 | ||
5158 | /* | |
5159 | * Call this after adding a new name for a file and it will properly | |
5160 | * update the log to reflect the new name. | |
5161 | * | |
5162 | * It will return zero if all goes well, and it will return 1 if a | |
5163 | * full transaction commit is required. | |
5164 | */ | |
5165 | int btrfs_log_new_name(struct btrfs_trans_handle *trans, | |
5166 | struct inode *inode, struct inode *old_dir, | |
5167 | struct dentry *parent) | |
5168 | { | |
5169 | struct btrfs_root * root = BTRFS_I(inode)->root; | |
5170 | ||
af4176b4 CM |
5171 | /* |
5172 | * this will force the logging code to walk the dentry chain | |
5173 | * up for the file | |
5174 | */ | |
5175 | if (S_ISREG(inode->i_mode)) | |
5176 | BTRFS_I(inode)->last_unlink_trans = trans->transid; | |
5177 | ||
12fcfd22 CM |
5178 | /* |
5179 | * if this inode hasn't been logged and directory we're renaming it | |
5180 | * from hasn't been logged, we don't need to log it | |
5181 | */ | |
5182 | if (BTRFS_I(inode)->logged_trans <= | |
5183 | root->fs_info->last_trans_committed && | |
5184 | (!old_dir || BTRFS_I(old_dir)->logged_trans <= | |
5185 | root->fs_info->last_trans_committed)) | |
5186 | return 0; | |
5187 | ||
49dae1bc FM |
5188 | return btrfs_log_inode_parent(trans, root, inode, parent, 0, |
5189 | LLONG_MAX, 1, NULL); | |
12fcfd22 CM |
5190 | } |
5191 |