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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> |
5dc562c5 | 21 | #include <linux/list_sort.h> |
e02119d5 CM |
22 | #include "ctree.h" |
23 | #include "transaction.h" | |
24 | #include "disk-io.h" | |
25 | #include "locking.h" | |
26 | #include "print-tree.h" | |
f186373f | 27 | #include "backref.h" |
e02119d5 | 28 | #include "compat.h" |
b2950863 | 29 | #include "tree-log.h" |
f186373f | 30 | #include "hash.h" |
e02119d5 CM |
31 | |
32 | /* magic values for the inode_only field in btrfs_log_inode: | |
33 | * | |
34 | * LOG_INODE_ALL means to log everything | |
35 | * LOG_INODE_EXISTS means to log just enough to recreate the inode | |
36 | * during log replay | |
37 | */ | |
38 | #define LOG_INODE_ALL 0 | |
39 | #define LOG_INODE_EXISTS 1 | |
40 | ||
12fcfd22 CM |
41 | /* |
42 | * directory trouble cases | |
43 | * | |
44 | * 1) on rename or unlink, if the inode being unlinked isn't in the fsync | |
45 | * log, we must force a full commit before doing an fsync of the directory | |
46 | * where the unlink was done. | |
47 | * ---> record transid of last unlink/rename per directory | |
48 | * | |
49 | * mkdir foo/some_dir | |
50 | * normal commit | |
51 | * rename foo/some_dir foo2/some_dir | |
52 | * mkdir foo/some_dir | |
53 | * fsync foo/some_dir/some_file | |
54 | * | |
55 | * The fsync above will unlink the original some_dir without recording | |
56 | * it in its new location (foo2). After a crash, some_dir will be gone | |
57 | * unless the fsync of some_file forces a full commit | |
58 | * | |
59 | * 2) we must log any new names for any file or dir that is in the fsync | |
60 | * log. ---> check inode while renaming/linking. | |
61 | * | |
62 | * 2a) we must log any new names for any file or dir during rename | |
63 | * when the directory they are being removed from was logged. | |
64 | * ---> check inode and old parent dir during rename | |
65 | * | |
66 | * 2a is actually the more important variant. With the extra logging | |
67 | * a crash might unlink the old name without recreating the new one | |
68 | * | |
69 | * 3) after a crash, we must go through any directories with a link count | |
70 | * of zero and redo the rm -rf | |
71 | * | |
72 | * mkdir f1/foo | |
73 | * normal commit | |
74 | * rm -rf f1/foo | |
75 | * fsync(f1) | |
76 | * | |
77 | * The directory f1 was fully removed from the FS, but fsync was never | |
78 | * called on f1, only its parent dir. After a crash the rm -rf must | |
79 | * be replayed. This must be able to recurse down the entire | |
80 | * directory tree. The inode link count fixup code takes care of the | |
81 | * ugly details. | |
82 | */ | |
83 | ||
e02119d5 CM |
84 | /* |
85 | * stages for the tree walking. The first | |
86 | * stage (0) is to only pin down the blocks we find | |
87 | * the second stage (1) is to make sure that all the inodes | |
88 | * we find in the log are created in the subvolume. | |
89 | * | |
90 | * The last stage is to deal with directories and links and extents | |
91 | * and all the other fun semantics | |
92 | */ | |
93 | #define LOG_WALK_PIN_ONLY 0 | |
94 | #define LOG_WALK_REPLAY_INODES 1 | |
95 | #define LOG_WALK_REPLAY_ALL 2 | |
96 | ||
12fcfd22 | 97 | static int btrfs_log_inode(struct btrfs_trans_handle *trans, |
e02119d5 CM |
98 | struct btrfs_root *root, struct inode *inode, |
99 | int inode_only); | |
ec051c0f YZ |
100 | static int link_to_fixup_dir(struct btrfs_trans_handle *trans, |
101 | struct btrfs_root *root, | |
102 | struct btrfs_path *path, u64 objectid); | |
12fcfd22 CM |
103 | static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, |
104 | struct btrfs_root *root, | |
105 | struct btrfs_root *log, | |
106 | struct btrfs_path *path, | |
107 | u64 dirid, int del_all); | |
e02119d5 CM |
108 | |
109 | /* | |
110 | * tree logging is a special write ahead log used to make sure that | |
111 | * fsyncs and O_SYNCs can happen without doing full tree commits. | |
112 | * | |
113 | * Full tree commits are expensive because they require commonly | |
114 | * modified blocks to be recowed, creating many dirty pages in the | |
115 | * extent tree an 4x-6x higher write load than ext3. | |
116 | * | |
117 | * Instead of doing a tree commit on every fsync, we use the | |
118 | * key ranges and transaction ids to find items for a given file or directory | |
119 | * that have changed in this transaction. Those items are copied into | |
120 | * a special tree (one per subvolume root), that tree is written to disk | |
121 | * and then the fsync is considered complete. | |
122 | * | |
123 | * After a crash, items are copied out of the log-tree back into the | |
124 | * subvolume tree. Any file data extents found are recorded in the extent | |
125 | * allocation tree, and the log-tree freed. | |
126 | * | |
127 | * The log tree is read three times, once to pin down all the extents it is | |
128 | * using in ram and once, once to create all the inodes logged in the tree | |
129 | * and once to do all the other items. | |
130 | */ | |
131 | ||
e02119d5 CM |
132 | /* |
133 | * start a sub transaction and setup the log tree | |
134 | * this increments the log tree writer count to make the people | |
135 | * syncing the tree wait for us to finish | |
136 | */ | |
137 | static int start_log_trans(struct btrfs_trans_handle *trans, | |
138 | struct btrfs_root *root) | |
139 | { | |
140 | int ret; | |
4a500fd1 | 141 | int err = 0; |
7237f183 YZ |
142 | |
143 | mutex_lock(&root->log_mutex); | |
144 | if (root->log_root) { | |
ff782e0a JB |
145 | if (!root->log_start_pid) { |
146 | root->log_start_pid = current->pid; | |
147 | root->log_multiple_pids = false; | |
148 | } else if (root->log_start_pid != current->pid) { | |
149 | root->log_multiple_pids = true; | |
150 | } | |
151 | ||
2ecb7923 | 152 | atomic_inc(&root->log_batch); |
7237f183 YZ |
153 | atomic_inc(&root->log_writers); |
154 | mutex_unlock(&root->log_mutex); | |
155 | return 0; | |
156 | } | |
ff782e0a JB |
157 | root->log_multiple_pids = false; |
158 | root->log_start_pid = current->pid; | |
e02119d5 CM |
159 | mutex_lock(&root->fs_info->tree_log_mutex); |
160 | if (!root->fs_info->log_root_tree) { | |
161 | ret = btrfs_init_log_root_tree(trans, root->fs_info); | |
4a500fd1 YZ |
162 | if (ret) |
163 | err = ret; | |
e02119d5 | 164 | } |
4a500fd1 | 165 | if (err == 0 && !root->log_root) { |
e02119d5 | 166 | ret = btrfs_add_log_tree(trans, root); |
4a500fd1 YZ |
167 | if (ret) |
168 | err = ret; | |
e02119d5 | 169 | } |
e02119d5 | 170 | mutex_unlock(&root->fs_info->tree_log_mutex); |
2ecb7923 | 171 | atomic_inc(&root->log_batch); |
7237f183 YZ |
172 | atomic_inc(&root->log_writers); |
173 | mutex_unlock(&root->log_mutex); | |
4a500fd1 | 174 | return err; |
e02119d5 CM |
175 | } |
176 | ||
177 | /* | |
178 | * returns 0 if there was a log transaction running and we were able | |
179 | * to join, or returns -ENOENT if there were not transactions | |
180 | * in progress | |
181 | */ | |
182 | static int join_running_log_trans(struct btrfs_root *root) | |
183 | { | |
184 | int ret = -ENOENT; | |
185 | ||
186 | smp_mb(); | |
187 | if (!root->log_root) | |
188 | return -ENOENT; | |
189 | ||
7237f183 | 190 | mutex_lock(&root->log_mutex); |
e02119d5 CM |
191 | if (root->log_root) { |
192 | ret = 0; | |
7237f183 | 193 | atomic_inc(&root->log_writers); |
e02119d5 | 194 | } |
7237f183 | 195 | mutex_unlock(&root->log_mutex); |
e02119d5 CM |
196 | return ret; |
197 | } | |
198 | ||
12fcfd22 CM |
199 | /* |
200 | * This either makes the current running log transaction wait | |
201 | * until you call btrfs_end_log_trans() or it makes any future | |
202 | * log transactions wait until you call btrfs_end_log_trans() | |
203 | */ | |
204 | int btrfs_pin_log_trans(struct btrfs_root *root) | |
205 | { | |
206 | int ret = -ENOENT; | |
207 | ||
208 | mutex_lock(&root->log_mutex); | |
209 | atomic_inc(&root->log_writers); | |
210 | mutex_unlock(&root->log_mutex); | |
211 | return ret; | |
212 | } | |
213 | ||
e02119d5 CM |
214 | /* |
215 | * indicate we're done making changes to the log tree | |
216 | * and wake up anyone waiting to do a sync | |
217 | */ | |
143bede5 | 218 | void btrfs_end_log_trans(struct btrfs_root *root) |
e02119d5 | 219 | { |
7237f183 YZ |
220 | if (atomic_dec_and_test(&root->log_writers)) { |
221 | smp_mb(); | |
222 | if (waitqueue_active(&root->log_writer_wait)) | |
223 | wake_up(&root->log_writer_wait); | |
224 | } | |
e02119d5 CM |
225 | } |
226 | ||
227 | ||
228 | /* | |
229 | * the walk control struct is used to pass state down the chain when | |
230 | * processing the log tree. The stage field tells us which part | |
231 | * of the log tree processing we are currently doing. The others | |
232 | * are state fields used for that specific part | |
233 | */ | |
234 | struct walk_control { | |
235 | /* should we free the extent on disk when done? This is used | |
236 | * at transaction commit time while freeing a log tree | |
237 | */ | |
238 | int free; | |
239 | ||
240 | /* should we write out the extent buffer? This is used | |
241 | * while flushing the log tree to disk during a sync | |
242 | */ | |
243 | int write; | |
244 | ||
245 | /* should we wait for the extent buffer io to finish? Also used | |
246 | * while flushing the log tree to disk for a sync | |
247 | */ | |
248 | int wait; | |
249 | ||
250 | /* pin only walk, we record which extents on disk belong to the | |
251 | * log trees | |
252 | */ | |
253 | int pin; | |
254 | ||
255 | /* what stage of the replay code we're currently in */ | |
256 | int stage; | |
257 | ||
258 | /* the root we are currently replaying */ | |
259 | struct btrfs_root *replay_dest; | |
260 | ||
261 | /* the trans handle for the current replay */ | |
262 | struct btrfs_trans_handle *trans; | |
263 | ||
264 | /* the function that gets used to process blocks we find in the | |
265 | * tree. Note the extent_buffer might not be up to date when it is | |
266 | * passed in, and it must be checked or read if you need the data | |
267 | * inside it | |
268 | */ | |
269 | int (*process_func)(struct btrfs_root *log, struct extent_buffer *eb, | |
270 | struct walk_control *wc, u64 gen); | |
271 | }; | |
272 | ||
273 | /* | |
274 | * process_func used to pin down extents, write them or wait on them | |
275 | */ | |
276 | static int process_one_buffer(struct btrfs_root *log, | |
277 | struct extent_buffer *eb, | |
278 | struct walk_control *wc, u64 gen) | |
279 | { | |
04018de5 | 280 | if (wc->pin) |
dcfac415 | 281 | btrfs_pin_extent_for_log_replay(log->fs_info->extent_root, |
e688b725 | 282 | eb->start, eb->len); |
e02119d5 | 283 | |
b9fab919 | 284 | if (btrfs_buffer_uptodate(eb, gen, 0)) { |
e02119d5 CM |
285 | if (wc->write) |
286 | btrfs_write_tree_block(eb); | |
287 | if (wc->wait) | |
288 | btrfs_wait_tree_block_writeback(eb); | |
289 | } | |
290 | return 0; | |
291 | } | |
292 | ||
293 | /* | |
294 | * Item overwrite used by replay and tree logging. eb, slot and key all refer | |
295 | * to the src data we are copying out. | |
296 | * | |
297 | * root is the tree we are copying into, and path is a scratch | |
298 | * path for use in this function (it should be released on entry and | |
299 | * will be released on exit). | |
300 | * | |
301 | * If the key is already in the destination tree the existing item is | |
302 | * overwritten. If the existing item isn't big enough, it is extended. | |
303 | * If it is too large, it is truncated. | |
304 | * | |
305 | * If the key isn't in the destination yet, a new item is inserted. | |
306 | */ | |
307 | static noinline int overwrite_item(struct btrfs_trans_handle *trans, | |
308 | struct btrfs_root *root, | |
309 | struct btrfs_path *path, | |
310 | struct extent_buffer *eb, int slot, | |
311 | struct btrfs_key *key) | |
312 | { | |
313 | int ret; | |
314 | u32 item_size; | |
315 | u64 saved_i_size = 0; | |
316 | int save_old_i_size = 0; | |
317 | unsigned long src_ptr; | |
318 | unsigned long dst_ptr; | |
319 | int overwrite_root = 0; | |
320 | ||
321 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
322 | overwrite_root = 1; | |
323 | ||
324 | item_size = btrfs_item_size_nr(eb, slot); | |
325 | src_ptr = btrfs_item_ptr_offset(eb, slot); | |
326 | ||
327 | /* look for the key in the destination tree */ | |
328 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); | |
329 | if (ret == 0) { | |
330 | char *src_copy; | |
331 | char *dst_copy; | |
332 | u32 dst_size = btrfs_item_size_nr(path->nodes[0], | |
333 | path->slots[0]); | |
334 | if (dst_size != item_size) | |
335 | goto insert; | |
336 | ||
337 | if (item_size == 0) { | |
b3b4aa74 | 338 | btrfs_release_path(path); |
e02119d5 CM |
339 | return 0; |
340 | } | |
341 | dst_copy = kmalloc(item_size, GFP_NOFS); | |
342 | src_copy = kmalloc(item_size, GFP_NOFS); | |
2a29edc6 | 343 | if (!dst_copy || !src_copy) { |
b3b4aa74 | 344 | btrfs_release_path(path); |
2a29edc6 | 345 | kfree(dst_copy); |
346 | kfree(src_copy); | |
347 | return -ENOMEM; | |
348 | } | |
e02119d5 CM |
349 | |
350 | read_extent_buffer(eb, src_copy, src_ptr, item_size); | |
351 | ||
352 | dst_ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); | |
353 | read_extent_buffer(path->nodes[0], dst_copy, dst_ptr, | |
354 | item_size); | |
355 | ret = memcmp(dst_copy, src_copy, item_size); | |
356 | ||
357 | kfree(dst_copy); | |
358 | kfree(src_copy); | |
359 | /* | |
360 | * they have the same contents, just return, this saves | |
361 | * us from cowing blocks in the destination tree and doing | |
362 | * extra writes that may not have been done by a previous | |
363 | * sync | |
364 | */ | |
365 | if (ret == 0) { | |
b3b4aa74 | 366 | btrfs_release_path(path); |
e02119d5 CM |
367 | return 0; |
368 | } | |
369 | ||
370 | } | |
371 | insert: | |
b3b4aa74 | 372 | btrfs_release_path(path); |
e02119d5 CM |
373 | /* try to insert the key into the destination tree */ |
374 | ret = btrfs_insert_empty_item(trans, root, path, | |
375 | key, item_size); | |
376 | ||
377 | /* make sure any existing item is the correct size */ | |
378 | if (ret == -EEXIST) { | |
379 | u32 found_size; | |
380 | found_size = btrfs_item_size_nr(path->nodes[0], | |
381 | path->slots[0]); | |
143bede5 | 382 | if (found_size > item_size) |
e02119d5 | 383 | btrfs_truncate_item(trans, root, path, item_size, 1); |
143bede5 JM |
384 | else if (found_size < item_size) |
385 | btrfs_extend_item(trans, root, path, | |
386 | item_size - found_size); | |
e02119d5 | 387 | } else if (ret) { |
4a500fd1 | 388 | return ret; |
e02119d5 CM |
389 | } |
390 | dst_ptr = btrfs_item_ptr_offset(path->nodes[0], | |
391 | path->slots[0]); | |
392 | ||
393 | /* don't overwrite an existing inode if the generation number | |
394 | * was logged as zero. This is done when the tree logging code | |
395 | * is just logging an inode to make sure it exists after recovery. | |
396 | * | |
397 | * Also, don't overwrite i_size on directories during replay. | |
398 | * log replay inserts and removes directory items based on the | |
399 | * state of the tree found in the subvolume, and i_size is modified | |
400 | * as it goes | |
401 | */ | |
402 | if (key->type == BTRFS_INODE_ITEM_KEY && ret == -EEXIST) { | |
403 | struct btrfs_inode_item *src_item; | |
404 | struct btrfs_inode_item *dst_item; | |
405 | ||
406 | src_item = (struct btrfs_inode_item *)src_ptr; | |
407 | dst_item = (struct btrfs_inode_item *)dst_ptr; | |
408 | ||
409 | if (btrfs_inode_generation(eb, src_item) == 0) | |
410 | goto no_copy; | |
411 | ||
412 | if (overwrite_root && | |
413 | S_ISDIR(btrfs_inode_mode(eb, src_item)) && | |
414 | S_ISDIR(btrfs_inode_mode(path->nodes[0], dst_item))) { | |
415 | save_old_i_size = 1; | |
416 | saved_i_size = btrfs_inode_size(path->nodes[0], | |
417 | dst_item); | |
418 | } | |
419 | } | |
420 | ||
421 | copy_extent_buffer(path->nodes[0], eb, dst_ptr, | |
422 | src_ptr, item_size); | |
423 | ||
424 | if (save_old_i_size) { | |
425 | struct btrfs_inode_item *dst_item; | |
426 | dst_item = (struct btrfs_inode_item *)dst_ptr; | |
427 | btrfs_set_inode_size(path->nodes[0], dst_item, saved_i_size); | |
428 | } | |
429 | ||
430 | /* make sure the generation is filled in */ | |
431 | if (key->type == BTRFS_INODE_ITEM_KEY) { | |
432 | struct btrfs_inode_item *dst_item; | |
433 | dst_item = (struct btrfs_inode_item *)dst_ptr; | |
434 | if (btrfs_inode_generation(path->nodes[0], dst_item) == 0) { | |
435 | btrfs_set_inode_generation(path->nodes[0], dst_item, | |
436 | trans->transid); | |
437 | } | |
438 | } | |
439 | no_copy: | |
440 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
b3b4aa74 | 441 | btrfs_release_path(path); |
e02119d5 CM |
442 | return 0; |
443 | } | |
444 | ||
445 | /* | |
446 | * simple helper to read an inode off the disk from a given root | |
447 | * This can only be called for subvolume roots and not for the log | |
448 | */ | |
449 | static noinline struct inode *read_one_inode(struct btrfs_root *root, | |
450 | u64 objectid) | |
451 | { | |
5d4f98a2 | 452 | struct btrfs_key key; |
e02119d5 | 453 | struct inode *inode; |
e02119d5 | 454 | |
5d4f98a2 YZ |
455 | key.objectid = objectid; |
456 | key.type = BTRFS_INODE_ITEM_KEY; | |
457 | key.offset = 0; | |
73f73415 | 458 | inode = btrfs_iget(root->fs_info->sb, &key, root, NULL); |
5d4f98a2 YZ |
459 | if (IS_ERR(inode)) { |
460 | inode = NULL; | |
461 | } else if (is_bad_inode(inode)) { | |
e02119d5 CM |
462 | iput(inode); |
463 | inode = NULL; | |
464 | } | |
465 | return inode; | |
466 | } | |
467 | ||
468 | /* replays a single extent in 'eb' at 'slot' with 'key' into the | |
469 | * subvolume 'root'. path is released on entry and should be released | |
470 | * on exit. | |
471 | * | |
472 | * extents in the log tree have not been allocated out of the extent | |
473 | * tree yet. So, this completes the allocation, taking a reference | |
474 | * as required if the extent already exists or creating a new extent | |
475 | * if it isn't in the extent allocation tree yet. | |
476 | * | |
477 | * The extent is inserted into the file, dropping any existing extents | |
478 | * from the file that overlap the new one. | |
479 | */ | |
480 | static noinline int replay_one_extent(struct btrfs_trans_handle *trans, | |
481 | struct btrfs_root *root, | |
482 | struct btrfs_path *path, | |
483 | struct extent_buffer *eb, int slot, | |
484 | struct btrfs_key *key) | |
485 | { | |
486 | int found_type; | |
e02119d5 | 487 | u64 extent_end; |
e02119d5 | 488 | u64 start = key->offset; |
07d400a6 | 489 | u64 saved_nbytes; |
e02119d5 CM |
490 | struct btrfs_file_extent_item *item; |
491 | struct inode *inode = NULL; | |
492 | unsigned long size; | |
493 | int ret = 0; | |
494 | ||
495 | item = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item); | |
496 | found_type = btrfs_file_extent_type(eb, item); | |
497 | ||
d899e052 YZ |
498 | if (found_type == BTRFS_FILE_EXTENT_REG || |
499 | found_type == BTRFS_FILE_EXTENT_PREALLOC) | |
e02119d5 CM |
500 | extent_end = start + btrfs_file_extent_num_bytes(eb, item); |
501 | else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
c8b97818 | 502 | size = btrfs_file_extent_inline_len(eb, item); |
fda2832f | 503 | extent_end = ALIGN(start + size, root->sectorsize); |
e02119d5 CM |
504 | } else { |
505 | ret = 0; | |
506 | goto out; | |
507 | } | |
508 | ||
509 | inode = read_one_inode(root, key->objectid); | |
510 | if (!inode) { | |
511 | ret = -EIO; | |
512 | goto out; | |
513 | } | |
514 | ||
515 | /* | |
516 | * first check to see if we already have this extent in the | |
517 | * file. This must be done before the btrfs_drop_extents run | |
518 | * so we don't try to drop this extent. | |
519 | */ | |
33345d01 | 520 | ret = btrfs_lookup_file_extent(trans, root, path, btrfs_ino(inode), |
e02119d5 CM |
521 | start, 0); |
522 | ||
d899e052 YZ |
523 | if (ret == 0 && |
524 | (found_type == BTRFS_FILE_EXTENT_REG || | |
525 | found_type == BTRFS_FILE_EXTENT_PREALLOC)) { | |
e02119d5 CM |
526 | struct btrfs_file_extent_item cmp1; |
527 | struct btrfs_file_extent_item cmp2; | |
528 | struct btrfs_file_extent_item *existing; | |
529 | struct extent_buffer *leaf; | |
530 | ||
531 | leaf = path->nodes[0]; | |
532 | existing = btrfs_item_ptr(leaf, path->slots[0], | |
533 | struct btrfs_file_extent_item); | |
534 | ||
535 | read_extent_buffer(eb, &cmp1, (unsigned long)item, | |
536 | sizeof(cmp1)); | |
537 | read_extent_buffer(leaf, &cmp2, (unsigned long)existing, | |
538 | sizeof(cmp2)); | |
539 | ||
540 | /* | |
541 | * we already have a pointer to this exact extent, | |
542 | * we don't have to do anything | |
543 | */ | |
544 | if (memcmp(&cmp1, &cmp2, sizeof(cmp1)) == 0) { | |
b3b4aa74 | 545 | btrfs_release_path(path); |
e02119d5 CM |
546 | goto out; |
547 | } | |
548 | } | |
b3b4aa74 | 549 | btrfs_release_path(path); |
e02119d5 | 550 | |
07d400a6 | 551 | saved_nbytes = inode_get_bytes(inode); |
e02119d5 | 552 | /* drop any overlapping extents */ |
2671485d | 553 | ret = btrfs_drop_extents(trans, root, inode, start, extent_end, 1); |
e02119d5 CM |
554 | BUG_ON(ret); |
555 | ||
07d400a6 YZ |
556 | if (found_type == BTRFS_FILE_EXTENT_REG || |
557 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
5d4f98a2 | 558 | u64 offset; |
07d400a6 YZ |
559 | unsigned long dest_offset; |
560 | struct btrfs_key ins; | |
561 | ||
562 | ret = btrfs_insert_empty_item(trans, root, path, key, | |
563 | sizeof(*item)); | |
564 | BUG_ON(ret); | |
565 | dest_offset = btrfs_item_ptr_offset(path->nodes[0], | |
566 | path->slots[0]); | |
567 | copy_extent_buffer(path->nodes[0], eb, dest_offset, | |
568 | (unsigned long)item, sizeof(*item)); | |
569 | ||
570 | ins.objectid = btrfs_file_extent_disk_bytenr(eb, item); | |
571 | ins.offset = btrfs_file_extent_disk_num_bytes(eb, item); | |
572 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
5d4f98a2 | 573 | offset = key->offset - btrfs_file_extent_offset(eb, item); |
07d400a6 YZ |
574 | |
575 | if (ins.objectid > 0) { | |
576 | u64 csum_start; | |
577 | u64 csum_end; | |
578 | LIST_HEAD(ordered_sums); | |
579 | /* | |
580 | * is this extent already allocated in the extent | |
581 | * allocation tree? If so, just add a reference | |
582 | */ | |
583 | ret = btrfs_lookup_extent(root, ins.objectid, | |
584 | ins.offset); | |
585 | if (ret == 0) { | |
586 | ret = btrfs_inc_extent_ref(trans, root, | |
587 | ins.objectid, ins.offset, | |
5d4f98a2 | 588 | 0, root->root_key.objectid, |
66d7e7f0 | 589 | key->objectid, offset, 0); |
37daa4f9 | 590 | BUG_ON(ret); |
07d400a6 YZ |
591 | } else { |
592 | /* | |
593 | * insert the extent pointer in the extent | |
594 | * allocation tree | |
595 | */ | |
5d4f98a2 YZ |
596 | ret = btrfs_alloc_logged_file_extent(trans, |
597 | root, root->root_key.objectid, | |
598 | key->objectid, offset, &ins); | |
07d400a6 YZ |
599 | BUG_ON(ret); |
600 | } | |
b3b4aa74 | 601 | btrfs_release_path(path); |
07d400a6 YZ |
602 | |
603 | if (btrfs_file_extent_compression(eb, item)) { | |
604 | csum_start = ins.objectid; | |
605 | csum_end = csum_start + ins.offset; | |
606 | } else { | |
607 | csum_start = ins.objectid + | |
608 | btrfs_file_extent_offset(eb, item); | |
609 | csum_end = csum_start + | |
610 | btrfs_file_extent_num_bytes(eb, item); | |
611 | } | |
612 | ||
613 | ret = btrfs_lookup_csums_range(root->log_root, | |
614 | csum_start, csum_end - 1, | |
a2de733c | 615 | &ordered_sums, 0); |
07d400a6 YZ |
616 | BUG_ON(ret); |
617 | while (!list_empty(&ordered_sums)) { | |
618 | struct btrfs_ordered_sum *sums; | |
619 | sums = list_entry(ordered_sums.next, | |
620 | struct btrfs_ordered_sum, | |
621 | list); | |
622 | ret = btrfs_csum_file_blocks(trans, | |
623 | root->fs_info->csum_root, | |
624 | sums); | |
625 | BUG_ON(ret); | |
626 | list_del(&sums->list); | |
627 | kfree(sums); | |
628 | } | |
629 | } else { | |
b3b4aa74 | 630 | btrfs_release_path(path); |
07d400a6 YZ |
631 | } |
632 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
633 | /* inline extents are easy, we just overwrite them */ | |
634 | ret = overwrite_item(trans, root, path, eb, slot, key); | |
635 | BUG_ON(ret); | |
636 | } | |
e02119d5 | 637 | |
07d400a6 | 638 | inode_set_bytes(inode, saved_nbytes); |
b9959295 | 639 | ret = btrfs_update_inode(trans, root, inode); |
e02119d5 CM |
640 | out: |
641 | if (inode) | |
642 | iput(inode); | |
643 | return ret; | |
644 | } | |
645 | ||
646 | /* | |
647 | * when cleaning up conflicts between the directory names in the | |
648 | * subvolume, directory names in the log and directory names in the | |
649 | * inode back references, we may have to unlink inodes from directories. | |
650 | * | |
651 | * This is a helper function to do the unlink of a specific directory | |
652 | * item | |
653 | */ | |
654 | static noinline int drop_one_dir_item(struct btrfs_trans_handle *trans, | |
655 | struct btrfs_root *root, | |
656 | struct btrfs_path *path, | |
657 | struct inode *dir, | |
658 | struct btrfs_dir_item *di) | |
659 | { | |
660 | struct inode *inode; | |
661 | char *name; | |
662 | int name_len; | |
663 | struct extent_buffer *leaf; | |
664 | struct btrfs_key location; | |
665 | int ret; | |
666 | ||
667 | leaf = path->nodes[0]; | |
668 | ||
669 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
670 | name_len = btrfs_dir_name_len(leaf, di); | |
671 | name = kmalloc(name_len, GFP_NOFS); | |
2a29edc6 | 672 | if (!name) |
673 | return -ENOMEM; | |
674 | ||
e02119d5 | 675 | read_extent_buffer(leaf, name, (unsigned long)(di + 1), name_len); |
b3b4aa74 | 676 | btrfs_release_path(path); |
e02119d5 CM |
677 | |
678 | inode = read_one_inode(root, location.objectid); | |
c00e9493 TI |
679 | if (!inode) { |
680 | kfree(name); | |
681 | return -EIO; | |
682 | } | |
e02119d5 | 683 | |
ec051c0f YZ |
684 | ret = link_to_fixup_dir(trans, root, path, location.objectid); |
685 | BUG_ON(ret); | |
12fcfd22 | 686 | |
e02119d5 | 687 | ret = btrfs_unlink_inode(trans, root, dir, inode, name, name_len); |
ec051c0f | 688 | BUG_ON(ret); |
e02119d5 CM |
689 | kfree(name); |
690 | ||
691 | iput(inode); | |
b6305567 CM |
692 | |
693 | btrfs_run_delayed_items(trans, root); | |
e02119d5 CM |
694 | return ret; |
695 | } | |
696 | ||
697 | /* | |
698 | * helper function to see if a given name and sequence number found | |
699 | * in an inode back reference are already in a directory and correctly | |
700 | * point to this inode | |
701 | */ | |
702 | static noinline int inode_in_dir(struct btrfs_root *root, | |
703 | struct btrfs_path *path, | |
704 | u64 dirid, u64 objectid, u64 index, | |
705 | const char *name, int name_len) | |
706 | { | |
707 | struct btrfs_dir_item *di; | |
708 | struct btrfs_key location; | |
709 | int match = 0; | |
710 | ||
711 | di = btrfs_lookup_dir_index_item(NULL, root, path, dirid, | |
712 | index, name, name_len, 0); | |
713 | if (di && !IS_ERR(di)) { | |
714 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
715 | if (location.objectid != objectid) | |
716 | goto out; | |
717 | } else | |
718 | goto out; | |
b3b4aa74 | 719 | btrfs_release_path(path); |
e02119d5 CM |
720 | |
721 | di = btrfs_lookup_dir_item(NULL, root, path, dirid, name, name_len, 0); | |
722 | if (di && !IS_ERR(di)) { | |
723 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
724 | if (location.objectid != objectid) | |
725 | goto out; | |
726 | } else | |
727 | goto out; | |
728 | match = 1; | |
729 | out: | |
b3b4aa74 | 730 | btrfs_release_path(path); |
e02119d5 CM |
731 | return match; |
732 | } | |
733 | ||
734 | /* | |
735 | * helper function to check a log tree for a named back reference in | |
736 | * an inode. This is used to decide if a back reference that is | |
737 | * found in the subvolume conflicts with what we find in the log. | |
738 | * | |
739 | * inode backreferences may have multiple refs in a single item, | |
740 | * during replay we process one reference at a time, and we don't | |
741 | * want to delete valid links to a file from the subvolume if that | |
742 | * link is also in the log. | |
743 | */ | |
744 | static noinline int backref_in_log(struct btrfs_root *log, | |
745 | struct btrfs_key *key, | |
f186373f | 746 | u64 ref_objectid, |
e02119d5 CM |
747 | char *name, int namelen) |
748 | { | |
749 | struct btrfs_path *path; | |
750 | struct btrfs_inode_ref *ref; | |
751 | unsigned long ptr; | |
752 | unsigned long ptr_end; | |
753 | unsigned long name_ptr; | |
754 | int found_name_len; | |
755 | int item_size; | |
756 | int ret; | |
757 | int match = 0; | |
758 | ||
759 | path = btrfs_alloc_path(); | |
2a29edc6 | 760 | if (!path) |
761 | return -ENOMEM; | |
762 | ||
e02119d5 CM |
763 | ret = btrfs_search_slot(NULL, log, key, path, 0, 0); |
764 | if (ret != 0) | |
765 | goto out; | |
766 | ||
e02119d5 | 767 | ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); |
f186373f MF |
768 | |
769 | if (key->type == BTRFS_INODE_EXTREF_KEY) { | |
770 | if (btrfs_find_name_in_ext_backref(path, ref_objectid, | |
771 | name, namelen, NULL)) | |
772 | match = 1; | |
773 | ||
774 | goto out; | |
775 | } | |
776 | ||
777 | item_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]); | |
e02119d5 CM |
778 | ptr_end = ptr + item_size; |
779 | while (ptr < ptr_end) { | |
780 | ref = (struct btrfs_inode_ref *)ptr; | |
781 | found_name_len = btrfs_inode_ref_name_len(path->nodes[0], ref); | |
782 | if (found_name_len == namelen) { | |
783 | name_ptr = (unsigned long)(ref + 1); | |
784 | ret = memcmp_extent_buffer(path->nodes[0], name, | |
785 | name_ptr, namelen); | |
786 | if (ret == 0) { | |
787 | match = 1; | |
788 | goto out; | |
789 | } | |
790 | } | |
791 | ptr = (unsigned long)(ref + 1) + found_name_len; | |
792 | } | |
793 | out: | |
794 | btrfs_free_path(path); | |
795 | return match; | |
796 | } | |
797 | ||
5a1d7843 | 798 | static inline int __add_inode_ref(struct btrfs_trans_handle *trans, |
e02119d5 | 799 | struct btrfs_root *root, |
e02119d5 | 800 | struct btrfs_path *path, |
5a1d7843 JS |
801 | struct btrfs_root *log_root, |
802 | struct inode *dir, struct inode *inode, | |
5a1d7843 | 803 | struct extent_buffer *eb, |
f186373f MF |
804 | u64 inode_objectid, u64 parent_objectid, |
805 | u64 ref_index, char *name, int namelen, | |
806 | int *search_done) | |
e02119d5 | 807 | { |
34f3e4f2 | 808 | int ret; |
f186373f MF |
809 | char *victim_name; |
810 | int victim_name_len; | |
811 | struct extent_buffer *leaf; | |
5a1d7843 | 812 | struct btrfs_dir_item *di; |
f186373f MF |
813 | struct btrfs_key search_key; |
814 | struct btrfs_inode_extref *extref; | |
c622ae60 | 815 | |
f186373f MF |
816 | again: |
817 | /* Search old style refs */ | |
818 | search_key.objectid = inode_objectid; | |
819 | search_key.type = BTRFS_INODE_REF_KEY; | |
820 | search_key.offset = parent_objectid; | |
821 | ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0); | |
e02119d5 | 822 | if (ret == 0) { |
e02119d5 CM |
823 | struct btrfs_inode_ref *victim_ref; |
824 | unsigned long ptr; | |
825 | unsigned long ptr_end; | |
f186373f MF |
826 | |
827 | leaf = path->nodes[0]; | |
e02119d5 CM |
828 | |
829 | /* are we trying to overwrite a back ref for the root directory | |
830 | * if so, just jump out, we're done | |
831 | */ | |
f186373f | 832 | if (search_key.objectid == search_key.offset) |
5a1d7843 | 833 | return 1; |
e02119d5 CM |
834 | |
835 | /* check all the names in this back reference to see | |
836 | * if they are in the log. if so, we allow them to stay | |
837 | * otherwise they must be unlinked as a conflict | |
838 | */ | |
839 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
840 | ptr_end = ptr + btrfs_item_size_nr(leaf, path->slots[0]); | |
d397712b | 841 | while (ptr < ptr_end) { |
e02119d5 CM |
842 | victim_ref = (struct btrfs_inode_ref *)ptr; |
843 | victim_name_len = btrfs_inode_ref_name_len(leaf, | |
844 | victim_ref); | |
845 | victim_name = kmalloc(victim_name_len, GFP_NOFS); | |
846 | BUG_ON(!victim_name); | |
847 | ||
848 | read_extent_buffer(leaf, victim_name, | |
849 | (unsigned long)(victim_ref + 1), | |
850 | victim_name_len); | |
851 | ||
f186373f MF |
852 | if (!backref_in_log(log_root, &search_key, |
853 | parent_objectid, | |
854 | victim_name, | |
e02119d5 CM |
855 | victim_name_len)) { |
856 | btrfs_inc_nlink(inode); | |
b3b4aa74 | 857 | btrfs_release_path(path); |
12fcfd22 | 858 | |
e02119d5 CM |
859 | ret = btrfs_unlink_inode(trans, root, dir, |
860 | inode, victim_name, | |
861 | victim_name_len); | |
f186373f | 862 | BUG_ON(ret); |
b6305567 | 863 | btrfs_run_delayed_items(trans, root); |
f186373f MF |
864 | kfree(victim_name); |
865 | *search_done = 1; | |
866 | goto again; | |
e02119d5 CM |
867 | } |
868 | kfree(victim_name); | |
f186373f | 869 | |
e02119d5 CM |
870 | ptr = (unsigned long)(victim_ref + 1) + victim_name_len; |
871 | } | |
872 | BUG_ON(ret); | |
e02119d5 | 873 | |
c622ae60 | 874 | /* |
875 | * NOTE: we have searched root tree and checked the | |
876 | * coresponding ref, it does not need to check again. | |
877 | */ | |
5a1d7843 | 878 | *search_done = 1; |
e02119d5 | 879 | } |
b3b4aa74 | 880 | btrfs_release_path(path); |
e02119d5 | 881 | |
f186373f MF |
882 | /* Same search but for extended refs */ |
883 | extref = btrfs_lookup_inode_extref(NULL, root, path, name, namelen, | |
884 | inode_objectid, parent_objectid, 0, | |
885 | 0); | |
886 | if (!IS_ERR_OR_NULL(extref)) { | |
887 | u32 item_size; | |
888 | u32 cur_offset = 0; | |
889 | unsigned long base; | |
890 | struct inode *victim_parent; | |
891 | ||
892 | leaf = path->nodes[0]; | |
893 | ||
894 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
895 | base = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
896 | ||
897 | while (cur_offset < item_size) { | |
898 | extref = (struct btrfs_inode_extref *)base + cur_offset; | |
899 | ||
900 | victim_name_len = btrfs_inode_extref_name_len(leaf, extref); | |
901 | ||
902 | if (btrfs_inode_extref_parent(leaf, extref) != parent_objectid) | |
903 | goto next; | |
904 | ||
905 | victim_name = kmalloc(victim_name_len, GFP_NOFS); | |
906 | read_extent_buffer(leaf, victim_name, (unsigned long)&extref->name, | |
907 | victim_name_len); | |
908 | ||
909 | search_key.objectid = inode_objectid; | |
910 | search_key.type = BTRFS_INODE_EXTREF_KEY; | |
911 | search_key.offset = btrfs_extref_hash(parent_objectid, | |
912 | victim_name, | |
913 | victim_name_len); | |
914 | ret = 0; | |
915 | if (!backref_in_log(log_root, &search_key, | |
916 | parent_objectid, victim_name, | |
917 | victim_name_len)) { | |
918 | ret = -ENOENT; | |
919 | victim_parent = read_one_inode(root, | |
920 | parent_objectid); | |
921 | if (victim_parent) { | |
922 | btrfs_inc_nlink(inode); | |
923 | btrfs_release_path(path); | |
924 | ||
925 | ret = btrfs_unlink_inode(trans, root, | |
926 | victim_parent, | |
927 | inode, | |
928 | victim_name, | |
929 | victim_name_len); | |
930 | btrfs_run_delayed_items(trans, root); | |
931 | } | |
932 | BUG_ON(ret); | |
933 | iput(victim_parent); | |
934 | kfree(victim_name); | |
935 | *search_done = 1; | |
936 | goto again; | |
937 | } | |
938 | kfree(victim_name); | |
939 | BUG_ON(ret); | |
940 | next: | |
941 | cur_offset += victim_name_len + sizeof(*extref); | |
942 | } | |
943 | *search_done = 1; | |
944 | } | |
945 | btrfs_release_path(path); | |
946 | ||
34f3e4f2 | 947 | /* look for a conflicting sequence number */ |
948 | di = btrfs_lookup_dir_index_item(trans, root, path, btrfs_ino(dir), | |
f186373f | 949 | ref_index, name, namelen, 0); |
34f3e4f2 | 950 | if (di && !IS_ERR(di)) { |
951 | ret = drop_one_dir_item(trans, root, path, dir, di); | |
952 | BUG_ON(ret); | |
953 | } | |
954 | btrfs_release_path(path); | |
955 | ||
956 | /* look for a conflicing name */ | |
957 | di = btrfs_lookup_dir_item(trans, root, path, btrfs_ino(dir), | |
958 | name, namelen, 0); | |
959 | if (di && !IS_ERR(di)) { | |
960 | ret = drop_one_dir_item(trans, root, path, dir, di); | |
961 | BUG_ON(ret); | |
962 | } | |
963 | btrfs_release_path(path); | |
964 | ||
5a1d7843 JS |
965 | return 0; |
966 | } | |
e02119d5 | 967 | |
f186373f MF |
968 | static int extref_get_fields(struct extent_buffer *eb, unsigned long ref_ptr, |
969 | u32 *namelen, char **name, u64 *index, | |
970 | u64 *parent_objectid) | |
971 | { | |
972 | struct btrfs_inode_extref *extref; | |
973 | ||
974 | extref = (struct btrfs_inode_extref *)ref_ptr; | |
975 | ||
976 | *namelen = btrfs_inode_extref_name_len(eb, extref); | |
977 | *name = kmalloc(*namelen, GFP_NOFS); | |
978 | if (*name == NULL) | |
979 | return -ENOMEM; | |
980 | ||
981 | read_extent_buffer(eb, *name, (unsigned long)&extref->name, | |
982 | *namelen); | |
983 | ||
984 | *index = btrfs_inode_extref_index(eb, extref); | |
985 | if (parent_objectid) | |
986 | *parent_objectid = btrfs_inode_extref_parent(eb, extref); | |
987 | ||
988 | return 0; | |
989 | } | |
990 | ||
991 | static int ref_get_fields(struct extent_buffer *eb, unsigned long ref_ptr, | |
992 | u32 *namelen, char **name, u64 *index) | |
993 | { | |
994 | struct btrfs_inode_ref *ref; | |
995 | ||
996 | ref = (struct btrfs_inode_ref *)ref_ptr; | |
997 | ||
998 | *namelen = btrfs_inode_ref_name_len(eb, ref); | |
999 | *name = kmalloc(*namelen, GFP_NOFS); | |
1000 | if (*name == NULL) | |
1001 | return -ENOMEM; | |
1002 | ||
1003 | read_extent_buffer(eb, *name, (unsigned long)(ref + 1), *namelen); | |
1004 | ||
1005 | *index = btrfs_inode_ref_index(eb, ref); | |
1006 | ||
1007 | return 0; | |
1008 | } | |
1009 | ||
5a1d7843 JS |
1010 | /* |
1011 | * replay one inode back reference item found in the log tree. | |
1012 | * eb, slot and key refer to the buffer and key found in the log tree. | |
1013 | * root is the destination we are replaying into, and path is for temp | |
1014 | * use by this function. (it should be released on return). | |
1015 | */ | |
1016 | static noinline int add_inode_ref(struct btrfs_trans_handle *trans, | |
1017 | struct btrfs_root *root, | |
1018 | struct btrfs_root *log, | |
1019 | struct btrfs_path *path, | |
1020 | struct extent_buffer *eb, int slot, | |
1021 | struct btrfs_key *key) | |
1022 | { | |
5a1d7843 JS |
1023 | struct inode *dir; |
1024 | struct inode *inode; | |
1025 | unsigned long ref_ptr; | |
1026 | unsigned long ref_end; | |
1027 | char *name; | |
1028 | int namelen; | |
1029 | int ret; | |
1030 | int search_done = 0; | |
f186373f MF |
1031 | int log_ref_ver = 0; |
1032 | u64 parent_objectid; | |
1033 | u64 inode_objectid; | |
f46dbe3d | 1034 | u64 ref_index = 0; |
f186373f MF |
1035 | int ref_struct_size; |
1036 | ||
1037 | ref_ptr = btrfs_item_ptr_offset(eb, slot); | |
1038 | ref_end = ref_ptr + btrfs_item_size_nr(eb, slot); | |
1039 | ||
1040 | if (key->type == BTRFS_INODE_EXTREF_KEY) { | |
1041 | struct btrfs_inode_extref *r; | |
1042 | ||
1043 | ref_struct_size = sizeof(struct btrfs_inode_extref); | |
1044 | log_ref_ver = 1; | |
1045 | r = (struct btrfs_inode_extref *)ref_ptr; | |
1046 | parent_objectid = btrfs_inode_extref_parent(eb, r); | |
1047 | } else { | |
1048 | ref_struct_size = sizeof(struct btrfs_inode_ref); | |
1049 | parent_objectid = key->offset; | |
1050 | } | |
1051 | inode_objectid = key->objectid; | |
e02119d5 | 1052 | |
5a1d7843 JS |
1053 | /* |
1054 | * it is possible that we didn't log all the parent directories | |
1055 | * for a given inode. If we don't find the dir, just don't | |
1056 | * copy the back ref in. The link count fixup code will take | |
1057 | * care of the rest | |
1058 | */ | |
f186373f | 1059 | dir = read_one_inode(root, parent_objectid); |
5a1d7843 JS |
1060 | if (!dir) |
1061 | return -ENOENT; | |
1062 | ||
f186373f | 1063 | inode = read_one_inode(root, inode_objectid); |
5a1d7843 JS |
1064 | if (!inode) { |
1065 | iput(dir); | |
1066 | return -EIO; | |
1067 | } | |
1068 | ||
5a1d7843 | 1069 | while (ref_ptr < ref_end) { |
f186373f MF |
1070 | if (log_ref_ver) { |
1071 | ret = extref_get_fields(eb, ref_ptr, &namelen, &name, | |
1072 | &ref_index, &parent_objectid); | |
1073 | /* | |
1074 | * parent object can change from one array | |
1075 | * item to another. | |
1076 | */ | |
1077 | if (!dir) | |
1078 | dir = read_one_inode(root, parent_objectid); | |
1079 | if (!dir) | |
1080 | return -ENOENT; | |
1081 | } else { | |
1082 | ret = ref_get_fields(eb, ref_ptr, &namelen, &name, | |
1083 | &ref_index); | |
1084 | } | |
1085 | if (ret) | |
1086 | return ret; | |
5a1d7843 JS |
1087 | |
1088 | /* if we already have a perfect match, we're done */ | |
1089 | if (!inode_in_dir(root, path, btrfs_ino(dir), btrfs_ino(inode), | |
f186373f | 1090 | ref_index, name, namelen)) { |
5a1d7843 JS |
1091 | /* |
1092 | * look for a conflicting back reference in the | |
1093 | * metadata. if we find one we have to unlink that name | |
1094 | * of the file before we add our new link. Later on, we | |
1095 | * overwrite any existing back reference, and we don't | |
1096 | * want to create dangling pointers in the directory. | |
1097 | */ | |
1098 | ||
1099 | if (!search_done) { | |
1100 | ret = __add_inode_ref(trans, root, path, log, | |
f186373f MF |
1101 | dir, inode, eb, |
1102 | inode_objectid, | |
1103 | parent_objectid, | |
1104 | ref_index, name, namelen, | |
5a1d7843 JS |
1105 | &search_done); |
1106 | if (ret == 1) | |
1107 | goto out; | |
1108 | BUG_ON(ret); | |
1109 | } | |
1110 | ||
1111 | /* insert our name */ | |
1112 | ret = btrfs_add_link(trans, dir, inode, name, namelen, | |
f186373f | 1113 | 0, ref_index); |
5a1d7843 JS |
1114 | BUG_ON(ret); |
1115 | ||
1116 | btrfs_update_inode(trans, root, inode); | |
1117 | } | |
1118 | ||
f186373f | 1119 | ref_ptr = (unsigned long)(ref_ptr + ref_struct_size) + namelen; |
5a1d7843 | 1120 | kfree(name); |
f186373f MF |
1121 | if (log_ref_ver) { |
1122 | iput(dir); | |
1123 | dir = NULL; | |
1124 | } | |
5a1d7843 | 1125 | } |
e02119d5 CM |
1126 | |
1127 | /* finally write the back reference in the inode */ | |
1128 | ret = overwrite_item(trans, root, path, eb, slot, key); | |
1129 | BUG_ON(ret); | |
1130 | ||
5a1d7843 | 1131 | out: |
b3b4aa74 | 1132 | btrfs_release_path(path); |
e02119d5 CM |
1133 | iput(dir); |
1134 | iput(inode); | |
1135 | return 0; | |
1136 | } | |
1137 | ||
c71bf099 YZ |
1138 | static int insert_orphan_item(struct btrfs_trans_handle *trans, |
1139 | struct btrfs_root *root, u64 offset) | |
1140 | { | |
1141 | int ret; | |
1142 | ret = btrfs_find_orphan_item(root, offset); | |
1143 | if (ret > 0) | |
1144 | ret = btrfs_insert_orphan_item(trans, root, offset); | |
1145 | return ret; | |
1146 | } | |
1147 | ||
f186373f MF |
1148 | static int count_inode_extrefs(struct btrfs_root *root, |
1149 | struct inode *inode, struct btrfs_path *path) | |
1150 | { | |
1151 | int ret = 0; | |
1152 | int name_len; | |
1153 | unsigned int nlink = 0; | |
1154 | u32 item_size; | |
1155 | u32 cur_offset = 0; | |
1156 | u64 inode_objectid = btrfs_ino(inode); | |
1157 | u64 offset = 0; | |
1158 | unsigned long ptr; | |
1159 | struct btrfs_inode_extref *extref; | |
1160 | struct extent_buffer *leaf; | |
1161 | ||
1162 | while (1) { | |
1163 | ret = btrfs_find_one_extref(root, inode_objectid, offset, path, | |
1164 | &extref, &offset); | |
1165 | if (ret) | |
1166 | break; | |
c71bf099 | 1167 | |
f186373f MF |
1168 | leaf = path->nodes[0]; |
1169 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1170 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
1171 | ||
1172 | while (cur_offset < item_size) { | |
1173 | extref = (struct btrfs_inode_extref *) (ptr + cur_offset); | |
1174 | name_len = btrfs_inode_extref_name_len(leaf, extref); | |
1175 | ||
1176 | nlink++; | |
1177 | ||
1178 | cur_offset += name_len + sizeof(*extref); | |
1179 | } | |
1180 | ||
1181 | offset++; | |
1182 | btrfs_release_path(path); | |
1183 | } | |
1184 | btrfs_release_path(path); | |
1185 | ||
1186 | if (ret < 0) | |
1187 | return ret; | |
1188 | return nlink; | |
1189 | } | |
1190 | ||
1191 | static int count_inode_refs(struct btrfs_root *root, | |
1192 | struct inode *inode, struct btrfs_path *path) | |
e02119d5 | 1193 | { |
e02119d5 CM |
1194 | int ret; |
1195 | struct btrfs_key key; | |
f186373f | 1196 | unsigned int nlink = 0; |
e02119d5 CM |
1197 | unsigned long ptr; |
1198 | unsigned long ptr_end; | |
1199 | int name_len; | |
33345d01 | 1200 | u64 ino = btrfs_ino(inode); |
e02119d5 | 1201 | |
33345d01 | 1202 | key.objectid = ino; |
e02119d5 CM |
1203 | key.type = BTRFS_INODE_REF_KEY; |
1204 | key.offset = (u64)-1; | |
1205 | ||
d397712b | 1206 | while (1) { |
e02119d5 CM |
1207 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1208 | if (ret < 0) | |
1209 | break; | |
1210 | if (ret > 0) { | |
1211 | if (path->slots[0] == 0) | |
1212 | break; | |
1213 | path->slots[0]--; | |
1214 | } | |
1215 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
1216 | path->slots[0]); | |
33345d01 | 1217 | if (key.objectid != ino || |
e02119d5 CM |
1218 | key.type != BTRFS_INODE_REF_KEY) |
1219 | break; | |
1220 | ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); | |
1221 | ptr_end = ptr + btrfs_item_size_nr(path->nodes[0], | |
1222 | path->slots[0]); | |
d397712b | 1223 | while (ptr < ptr_end) { |
e02119d5 CM |
1224 | struct btrfs_inode_ref *ref; |
1225 | ||
1226 | ref = (struct btrfs_inode_ref *)ptr; | |
1227 | name_len = btrfs_inode_ref_name_len(path->nodes[0], | |
1228 | ref); | |
1229 | ptr = (unsigned long)(ref + 1) + name_len; | |
1230 | nlink++; | |
1231 | } | |
1232 | ||
1233 | if (key.offset == 0) | |
1234 | break; | |
1235 | key.offset--; | |
b3b4aa74 | 1236 | btrfs_release_path(path); |
e02119d5 | 1237 | } |
b3b4aa74 | 1238 | btrfs_release_path(path); |
f186373f MF |
1239 | |
1240 | return nlink; | |
1241 | } | |
1242 | ||
1243 | /* | |
1244 | * There are a few corners where the link count of the file can't | |
1245 | * be properly maintained during replay. So, instead of adding | |
1246 | * lots of complexity to the log code, we just scan the backrefs | |
1247 | * for any file that has been through replay. | |
1248 | * | |
1249 | * The scan will update the link count on the inode to reflect the | |
1250 | * number of back refs found. If it goes down to zero, the iput | |
1251 | * will free the inode. | |
1252 | */ | |
1253 | static noinline int fixup_inode_link_count(struct btrfs_trans_handle *trans, | |
1254 | struct btrfs_root *root, | |
1255 | struct inode *inode) | |
1256 | { | |
1257 | struct btrfs_path *path; | |
1258 | int ret; | |
1259 | u64 nlink = 0; | |
1260 | u64 ino = btrfs_ino(inode); | |
1261 | ||
1262 | path = btrfs_alloc_path(); | |
1263 | if (!path) | |
1264 | return -ENOMEM; | |
1265 | ||
1266 | ret = count_inode_refs(root, inode, path); | |
1267 | if (ret < 0) | |
1268 | goto out; | |
1269 | ||
1270 | nlink = ret; | |
1271 | ||
1272 | ret = count_inode_extrefs(root, inode, path); | |
1273 | if (ret == -ENOENT) | |
1274 | ret = 0; | |
1275 | ||
1276 | if (ret < 0) | |
1277 | goto out; | |
1278 | ||
1279 | nlink += ret; | |
1280 | ||
1281 | ret = 0; | |
1282 | ||
e02119d5 | 1283 | if (nlink != inode->i_nlink) { |
bfe86848 | 1284 | set_nlink(inode, nlink); |
e02119d5 CM |
1285 | btrfs_update_inode(trans, root, inode); |
1286 | } | |
8d5bf1cb | 1287 | BTRFS_I(inode)->index_cnt = (u64)-1; |
e02119d5 | 1288 | |
c71bf099 YZ |
1289 | if (inode->i_nlink == 0) { |
1290 | if (S_ISDIR(inode->i_mode)) { | |
1291 | ret = replay_dir_deletes(trans, root, NULL, path, | |
33345d01 | 1292 | ino, 1); |
c71bf099 YZ |
1293 | BUG_ON(ret); |
1294 | } | |
33345d01 | 1295 | ret = insert_orphan_item(trans, root, ino); |
12fcfd22 CM |
1296 | BUG_ON(ret); |
1297 | } | |
12fcfd22 | 1298 | |
f186373f MF |
1299 | out: |
1300 | btrfs_free_path(path); | |
1301 | return ret; | |
e02119d5 CM |
1302 | } |
1303 | ||
1304 | static noinline int fixup_inode_link_counts(struct btrfs_trans_handle *trans, | |
1305 | struct btrfs_root *root, | |
1306 | struct btrfs_path *path) | |
1307 | { | |
1308 | int ret; | |
1309 | struct btrfs_key key; | |
1310 | struct inode *inode; | |
1311 | ||
1312 | key.objectid = BTRFS_TREE_LOG_FIXUP_OBJECTID; | |
1313 | key.type = BTRFS_ORPHAN_ITEM_KEY; | |
1314 | key.offset = (u64)-1; | |
d397712b | 1315 | while (1) { |
e02119d5 CM |
1316 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1317 | if (ret < 0) | |
1318 | break; | |
1319 | ||
1320 | if (ret == 1) { | |
1321 | if (path->slots[0] == 0) | |
1322 | break; | |
1323 | path->slots[0]--; | |
1324 | } | |
1325 | ||
1326 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1327 | if (key.objectid != BTRFS_TREE_LOG_FIXUP_OBJECTID || | |
1328 | key.type != BTRFS_ORPHAN_ITEM_KEY) | |
1329 | break; | |
1330 | ||
1331 | ret = btrfs_del_item(trans, root, path); | |
65a246c5 TI |
1332 | if (ret) |
1333 | goto out; | |
e02119d5 | 1334 | |
b3b4aa74 | 1335 | btrfs_release_path(path); |
e02119d5 | 1336 | inode = read_one_inode(root, key.offset); |
c00e9493 TI |
1337 | if (!inode) |
1338 | return -EIO; | |
e02119d5 CM |
1339 | |
1340 | ret = fixup_inode_link_count(trans, root, inode); | |
1341 | BUG_ON(ret); | |
1342 | ||
1343 | iput(inode); | |
1344 | ||
12fcfd22 CM |
1345 | /* |
1346 | * fixup on a directory may create new entries, | |
1347 | * make sure we always look for the highset possible | |
1348 | * offset | |
1349 | */ | |
1350 | key.offset = (u64)-1; | |
e02119d5 | 1351 | } |
65a246c5 TI |
1352 | ret = 0; |
1353 | out: | |
b3b4aa74 | 1354 | btrfs_release_path(path); |
65a246c5 | 1355 | return ret; |
e02119d5 CM |
1356 | } |
1357 | ||
1358 | ||
1359 | /* | |
1360 | * record a given inode in the fixup dir so we can check its link | |
1361 | * count when replay is done. The link count is incremented here | |
1362 | * so the inode won't go away until we check it | |
1363 | */ | |
1364 | static noinline int link_to_fixup_dir(struct btrfs_trans_handle *trans, | |
1365 | struct btrfs_root *root, | |
1366 | struct btrfs_path *path, | |
1367 | u64 objectid) | |
1368 | { | |
1369 | struct btrfs_key key; | |
1370 | int ret = 0; | |
1371 | struct inode *inode; | |
1372 | ||
1373 | inode = read_one_inode(root, objectid); | |
c00e9493 TI |
1374 | if (!inode) |
1375 | return -EIO; | |
e02119d5 CM |
1376 | |
1377 | key.objectid = BTRFS_TREE_LOG_FIXUP_OBJECTID; | |
1378 | btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY); | |
1379 | key.offset = objectid; | |
1380 | ||
1381 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
1382 | ||
b3b4aa74 | 1383 | btrfs_release_path(path); |
e02119d5 | 1384 | if (ret == 0) { |
9bf7a489 JB |
1385 | if (!inode->i_nlink) |
1386 | set_nlink(inode, 1); | |
1387 | else | |
1388 | btrfs_inc_nlink(inode); | |
b9959295 | 1389 | ret = btrfs_update_inode(trans, root, inode); |
e02119d5 CM |
1390 | } else if (ret == -EEXIST) { |
1391 | ret = 0; | |
1392 | } else { | |
1393 | BUG(); | |
1394 | } | |
1395 | iput(inode); | |
1396 | ||
1397 | return ret; | |
1398 | } | |
1399 | ||
1400 | /* | |
1401 | * when replaying the log for a directory, we only insert names | |
1402 | * for inodes that actually exist. This means an fsync on a directory | |
1403 | * does not implicitly fsync all the new files in it | |
1404 | */ | |
1405 | static noinline int insert_one_name(struct btrfs_trans_handle *trans, | |
1406 | struct btrfs_root *root, | |
1407 | struct btrfs_path *path, | |
1408 | u64 dirid, u64 index, | |
1409 | char *name, int name_len, u8 type, | |
1410 | struct btrfs_key *location) | |
1411 | { | |
1412 | struct inode *inode; | |
1413 | struct inode *dir; | |
1414 | int ret; | |
1415 | ||
1416 | inode = read_one_inode(root, location->objectid); | |
1417 | if (!inode) | |
1418 | return -ENOENT; | |
1419 | ||
1420 | dir = read_one_inode(root, dirid); | |
1421 | if (!dir) { | |
1422 | iput(inode); | |
1423 | return -EIO; | |
1424 | } | |
1425 | ret = btrfs_add_link(trans, dir, inode, name, name_len, 1, index); | |
1426 | ||
1427 | /* FIXME, put inode into FIXUP list */ | |
1428 | ||
1429 | iput(inode); | |
1430 | iput(dir); | |
1431 | return ret; | |
1432 | } | |
1433 | ||
1434 | /* | |
1435 | * take a single entry in a log directory item and replay it into | |
1436 | * the subvolume. | |
1437 | * | |
1438 | * if a conflicting item exists in the subdirectory already, | |
1439 | * the inode it points to is unlinked and put into the link count | |
1440 | * fix up tree. | |
1441 | * | |
1442 | * If a name from the log points to a file or directory that does | |
1443 | * not exist in the FS, it is skipped. fsyncs on directories | |
1444 | * do not force down inodes inside that directory, just changes to the | |
1445 | * names or unlinks in a directory. | |
1446 | */ | |
1447 | static noinline int replay_one_name(struct btrfs_trans_handle *trans, | |
1448 | struct btrfs_root *root, | |
1449 | struct btrfs_path *path, | |
1450 | struct extent_buffer *eb, | |
1451 | struct btrfs_dir_item *di, | |
1452 | struct btrfs_key *key) | |
1453 | { | |
1454 | char *name; | |
1455 | int name_len; | |
1456 | struct btrfs_dir_item *dst_di; | |
1457 | struct btrfs_key found_key; | |
1458 | struct btrfs_key log_key; | |
1459 | struct inode *dir; | |
e02119d5 | 1460 | u8 log_type; |
4bef0848 | 1461 | int exists; |
e02119d5 CM |
1462 | int ret; |
1463 | ||
1464 | dir = read_one_inode(root, key->objectid); | |
c00e9493 TI |
1465 | if (!dir) |
1466 | return -EIO; | |
e02119d5 CM |
1467 | |
1468 | name_len = btrfs_dir_name_len(eb, di); | |
1469 | name = kmalloc(name_len, GFP_NOFS); | |
2a29edc6 | 1470 | if (!name) |
1471 | return -ENOMEM; | |
1472 | ||
e02119d5 CM |
1473 | log_type = btrfs_dir_type(eb, di); |
1474 | read_extent_buffer(eb, name, (unsigned long)(di + 1), | |
1475 | name_len); | |
1476 | ||
1477 | btrfs_dir_item_key_to_cpu(eb, di, &log_key); | |
4bef0848 CM |
1478 | exists = btrfs_lookup_inode(trans, root, path, &log_key, 0); |
1479 | if (exists == 0) | |
1480 | exists = 1; | |
1481 | else | |
1482 | exists = 0; | |
b3b4aa74 | 1483 | btrfs_release_path(path); |
4bef0848 | 1484 | |
e02119d5 CM |
1485 | if (key->type == BTRFS_DIR_ITEM_KEY) { |
1486 | dst_di = btrfs_lookup_dir_item(trans, root, path, key->objectid, | |
1487 | name, name_len, 1); | |
d397712b | 1488 | } else if (key->type == BTRFS_DIR_INDEX_KEY) { |
e02119d5 CM |
1489 | dst_di = btrfs_lookup_dir_index_item(trans, root, path, |
1490 | key->objectid, | |
1491 | key->offset, name, | |
1492 | name_len, 1); | |
1493 | } else { | |
1494 | BUG(); | |
1495 | } | |
c704005d | 1496 | if (IS_ERR_OR_NULL(dst_di)) { |
e02119d5 CM |
1497 | /* we need a sequence number to insert, so we only |
1498 | * do inserts for the BTRFS_DIR_INDEX_KEY types | |
1499 | */ | |
1500 | if (key->type != BTRFS_DIR_INDEX_KEY) | |
1501 | goto out; | |
1502 | goto insert; | |
1503 | } | |
1504 | ||
1505 | btrfs_dir_item_key_to_cpu(path->nodes[0], dst_di, &found_key); | |
1506 | /* the existing item matches the logged item */ | |
1507 | if (found_key.objectid == log_key.objectid && | |
1508 | found_key.type == log_key.type && | |
1509 | found_key.offset == log_key.offset && | |
1510 | btrfs_dir_type(path->nodes[0], dst_di) == log_type) { | |
1511 | goto out; | |
1512 | } | |
1513 | ||
1514 | /* | |
1515 | * don't drop the conflicting directory entry if the inode | |
1516 | * for the new entry doesn't exist | |
1517 | */ | |
4bef0848 | 1518 | if (!exists) |
e02119d5 CM |
1519 | goto out; |
1520 | ||
e02119d5 CM |
1521 | ret = drop_one_dir_item(trans, root, path, dir, dst_di); |
1522 | BUG_ON(ret); | |
1523 | ||
1524 | if (key->type == BTRFS_DIR_INDEX_KEY) | |
1525 | goto insert; | |
1526 | out: | |
b3b4aa74 | 1527 | btrfs_release_path(path); |
e02119d5 CM |
1528 | kfree(name); |
1529 | iput(dir); | |
1530 | return 0; | |
1531 | ||
1532 | insert: | |
b3b4aa74 | 1533 | btrfs_release_path(path); |
e02119d5 CM |
1534 | ret = insert_one_name(trans, root, path, key->objectid, key->offset, |
1535 | name, name_len, log_type, &log_key); | |
1536 | ||
c293498b | 1537 | BUG_ON(ret && ret != -ENOENT); |
e02119d5 CM |
1538 | goto out; |
1539 | } | |
1540 | ||
1541 | /* | |
1542 | * find all the names in a directory item and reconcile them into | |
1543 | * the subvolume. Only BTRFS_DIR_ITEM_KEY types will have more than | |
1544 | * one name in a directory item, but the same code gets used for | |
1545 | * both directory index types | |
1546 | */ | |
1547 | static noinline int replay_one_dir_item(struct btrfs_trans_handle *trans, | |
1548 | struct btrfs_root *root, | |
1549 | struct btrfs_path *path, | |
1550 | struct extent_buffer *eb, int slot, | |
1551 | struct btrfs_key *key) | |
1552 | { | |
1553 | int ret; | |
1554 | u32 item_size = btrfs_item_size_nr(eb, slot); | |
1555 | struct btrfs_dir_item *di; | |
1556 | int name_len; | |
1557 | unsigned long ptr; | |
1558 | unsigned long ptr_end; | |
1559 | ||
1560 | ptr = btrfs_item_ptr_offset(eb, slot); | |
1561 | ptr_end = ptr + item_size; | |
d397712b | 1562 | while (ptr < ptr_end) { |
e02119d5 | 1563 | di = (struct btrfs_dir_item *)ptr; |
22a94d44 JB |
1564 | if (verify_dir_item(root, eb, di)) |
1565 | return -EIO; | |
e02119d5 CM |
1566 | name_len = btrfs_dir_name_len(eb, di); |
1567 | ret = replay_one_name(trans, root, path, eb, di, key); | |
1568 | BUG_ON(ret); | |
1569 | ptr = (unsigned long)(di + 1); | |
1570 | ptr += name_len; | |
1571 | } | |
1572 | return 0; | |
1573 | } | |
1574 | ||
1575 | /* | |
1576 | * directory replay has two parts. There are the standard directory | |
1577 | * items in the log copied from the subvolume, and range items | |
1578 | * created in the log while the subvolume was logged. | |
1579 | * | |
1580 | * The range items tell us which parts of the key space the log | |
1581 | * is authoritative for. During replay, if a key in the subvolume | |
1582 | * directory is in a logged range item, but not actually in the log | |
1583 | * that means it was deleted from the directory before the fsync | |
1584 | * and should be removed. | |
1585 | */ | |
1586 | static noinline int find_dir_range(struct btrfs_root *root, | |
1587 | struct btrfs_path *path, | |
1588 | u64 dirid, int key_type, | |
1589 | u64 *start_ret, u64 *end_ret) | |
1590 | { | |
1591 | struct btrfs_key key; | |
1592 | u64 found_end; | |
1593 | struct btrfs_dir_log_item *item; | |
1594 | int ret; | |
1595 | int nritems; | |
1596 | ||
1597 | if (*start_ret == (u64)-1) | |
1598 | return 1; | |
1599 | ||
1600 | key.objectid = dirid; | |
1601 | key.type = key_type; | |
1602 | key.offset = *start_ret; | |
1603 | ||
1604 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1605 | if (ret < 0) | |
1606 | goto out; | |
1607 | if (ret > 0) { | |
1608 | if (path->slots[0] == 0) | |
1609 | goto out; | |
1610 | path->slots[0]--; | |
1611 | } | |
1612 | if (ret != 0) | |
1613 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1614 | ||
1615 | if (key.type != key_type || key.objectid != dirid) { | |
1616 | ret = 1; | |
1617 | goto next; | |
1618 | } | |
1619 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1620 | struct btrfs_dir_log_item); | |
1621 | found_end = btrfs_dir_log_end(path->nodes[0], item); | |
1622 | ||
1623 | if (*start_ret >= key.offset && *start_ret <= found_end) { | |
1624 | ret = 0; | |
1625 | *start_ret = key.offset; | |
1626 | *end_ret = found_end; | |
1627 | goto out; | |
1628 | } | |
1629 | ret = 1; | |
1630 | next: | |
1631 | /* check the next slot in the tree to see if it is a valid item */ | |
1632 | nritems = btrfs_header_nritems(path->nodes[0]); | |
1633 | if (path->slots[0] >= nritems) { | |
1634 | ret = btrfs_next_leaf(root, path); | |
1635 | if (ret) | |
1636 | goto out; | |
1637 | } else { | |
1638 | path->slots[0]++; | |
1639 | } | |
1640 | ||
1641 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1642 | ||
1643 | if (key.type != key_type || key.objectid != dirid) { | |
1644 | ret = 1; | |
1645 | goto out; | |
1646 | } | |
1647 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1648 | struct btrfs_dir_log_item); | |
1649 | found_end = btrfs_dir_log_end(path->nodes[0], item); | |
1650 | *start_ret = key.offset; | |
1651 | *end_ret = found_end; | |
1652 | ret = 0; | |
1653 | out: | |
b3b4aa74 | 1654 | btrfs_release_path(path); |
e02119d5 CM |
1655 | return ret; |
1656 | } | |
1657 | ||
1658 | /* | |
1659 | * this looks for a given directory item in the log. If the directory | |
1660 | * item is not in the log, the item is removed and the inode it points | |
1661 | * to is unlinked | |
1662 | */ | |
1663 | static noinline int check_item_in_log(struct btrfs_trans_handle *trans, | |
1664 | struct btrfs_root *root, | |
1665 | struct btrfs_root *log, | |
1666 | struct btrfs_path *path, | |
1667 | struct btrfs_path *log_path, | |
1668 | struct inode *dir, | |
1669 | struct btrfs_key *dir_key) | |
1670 | { | |
1671 | int ret; | |
1672 | struct extent_buffer *eb; | |
1673 | int slot; | |
1674 | u32 item_size; | |
1675 | struct btrfs_dir_item *di; | |
1676 | struct btrfs_dir_item *log_di; | |
1677 | int name_len; | |
1678 | unsigned long ptr; | |
1679 | unsigned long ptr_end; | |
1680 | char *name; | |
1681 | struct inode *inode; | |
1682 | struct btrfs_key location; | |
1683 | ||
1684 | again: | |
1685 | eb = path->nodes[0]; | |
1686 | slot = path->slots[0]; | |
1687 | item_size = btrfs_item_size_nr(eb, slot); | |
1688 | ptr = btrfs_item_ptr_offset(eb, slot); | |
1689 | ptr_end = ptr + item_size; | |
d397712b | 1690 | while (ptr < ptr_end) { |
e02119d5 | 1691 | di = (struct btrfs_dir_item *)ptr; |
22a94d44 JB |
1692 | if (verify_dir_item(root, eb, di)) { |
1693 | ret = -EIO; | |
1694 | goto out; | |
1695 | } | |
1696 | ||
e02119d5 CM |
1697 | name_len = btrfs_dir_name_len(eb, di); |
1698 | name = kmalloc(name_len, GFP_NOFS); | |
1699 | if (!name) { | |
1700 | ret = -ENOMEM; | |
1701 | goto out; | |
1702 | } | |
1703 | read_extent_buffer(eb, name, (unsigned long)(di + 1), | |
1704 | name_len); | |
1705 | log_di = NULL; | |
12fcfd22 | 1706 | if (log && dir_key->type == BTRFS_DIR_ITEM_KEY) { |
e02119d5 CM |
1707 | log_di = btrfs_lookup_dir_item(trans, log, log_path, |
1708 | dir_key->objectid, | |
1709 | name, name_len, 0); | |
12fcfd22 | 1710 | } else if (log && dir_key->type == BTRFS_DIR_INDEX_KEY) { |
e02119d5 CM |
1711 | log_di = btrfs_lookup_dir_index_item(trans, log, |
1712 | log_path, | |
1713 | dir_key->objectid, | |
1714 | dir_key->offset, | |
1715 | name, name_len, 0); | |
1716 | } | |
c704005d | 1717 | if (IS_ERR_OR_NULL(log_di)) { |
e02119d5 | 1718 | btrfs_dir_item_key_to_cpu(eb, di, &location); |
b3b4aa74 DS |
1719 | btrfs_release_path(path); |
1720 | btrfs_release_path(log_path); | |
e02119d5 | 1721 | inode = read_one_inode(root, location.objectid); |
c00e9493 TI |
1722 | if (!inode) { |
1723 | kfree(name); | |
1724 | return -EIO; | |
1725 | } | |
e02119d5 CM |
1726 | |
1727 | ret = link_to_fixup_dir(trans, root, | |
1728 | path, location.objectid); | |
1729 | BUG_ON(ret); | |
1730 | btrfs_inc_nlink(inode); | |
1731 | ret = btrfs_unlink_inode(trans, root, dir, inode, | |
1732 | name, name_len); | |
1733 | BUG_ON(ret); | |
b6305567 CM |
1734 | |
1735 | btrfs_run_delayed_items(trans, root); | |
1736 | ||
e02119d5 CM |
1737 | kfree(name); |
1738 | iput(inode); | |
1739 | ||
1740 | /* there might still be more names under this key | |
1741 | * check and repeat if required | |
1742 | */ | |
1743 | ret = btrfs_search_slot(NULL, root, dir_key, path, | |
1744 | 0, 0); | |
1745 | if (ret == 0) | |
1746 | goto again; | |
1747 | ret = 0; | |
1748 | goto out; | |
1749 | } | |
b3b4aa74 | 1750 | btrfs_release_path(log_path); |
e02119d5 CM |
1751 | kfree(name); |
1752 | ||
1753 | ptr = (unsigned long)(di + 1); | |
1754 | ptr += name_len; | |
1755 | } | |
1756 | ret = 0; | |
1757 | out: | |
b3b4aa74 DS |
1758 | btrfs_release_path(path); |
1759 | btrfs_release_path(log_path); | |
e02119d5 CM |
1760 | return ret; |
1761 | } | |
1762 | ||
1763 | /* | |
1764 | * deletion replay happens before we copy any new directory items | |
1765 | * out of the log or out of backreferences from inodes. It | |
1766 | * scans the log to find ranges of keys that log is authoritative for, | |
1767 | * and then scans the directory to find items in those ranges that are | |
1768 | * not present in the log. | |
1769 | * | |
1770 | * Anything we don't find in the log is unlinked and removed from the | |
1771 | * directory. | |
1772 | */ | |
1773 | static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, | |
1774 | struct btrfs_root *root, | |
1775 | struct btrfs_root *log, | |
1776 | struct btrfs_path *path, | |
12fcfd22 | 1777 | u64 dirid, int del_all) |
e02119d5 CM |
1778 | { |
1779 | u64 range_start; | |
1780 | u64 range_end; | |
1781 | int key_type = BTRFS_DIR_LOG_ITEM_KEY; | |
1782 | int ret = 0; | |
1783 | struct btrfs_key dir_key; | |
1784 | struct btrfs_key found_key; | |
1785 | struct btrfs_path *log_path; | |
1786 | struct inode *dir; | |
1787 | ||
1788 | dir_key.objectid = dirid; | |
1789 | dir_key.type = BTRFS_DIR_ITEM_KEY; | |
1790 | log_path = btrfs_alloc_path(); | |
1791 | if (!log_path) | |
1792 | return -ENOMEM; | |
1793 | ||
1794 | dir = read_one_inode(root, dirid); | |
1795 | /* it isn't an error if the inode isn't there, that can happen | |
1796 | * because we replay the deletes before we copy in the inode item | |
1797 | * from the log | |
1798 | */ | |
1799 | if (!dir) { | |
1800 | btrfs_free_path(log_path); | |
1801 | return 0; | |
1802 | } | |
1803 | again: | |
1804 | range_start = 0; | |
1805 | range_end = 0; | |
d397712b | 1806 | while (1) { |
12fcfd22 CM |
1807 | if (del_all) |
1808 | range_end = (u64)-1; | |
1809 | else { | |
1810 | ret = find_dir_range(log, path, dirid, key_type, | |
1811 | &range_start, &range_end); | |
1812 | if (ret != 0) | |
1813 | break; | |
1814 | } | |
e02119d5 CM |
1815 | |
1816 | dir_key.offset = range_start; | |
d397712b | 1817 | while (1) { |
e02119d5 CM |
1818 | int nritems; |
1819 | ret = btrfs_search_slot(NULL, root, &dir_key, path, | |
1820 | 0, 0); | |
1821 | if (ret < 0) | |
1822 | goto out; | |
1823 | ||
1824 | nritems = btrfs_header_nritems(path->nodes[0]); | |
1825 | if (path->slots[0] >= nritems) { | |
1826 | ret = btrfs_next_leaf(root, path); | |
1827 | if (ret) | |
1828 | break; | |
1829 | } | |
1830 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1831 | path->slots[0]); | |
1832 | if (found_key.objectid != dirid || | |
1833 | found_key.type != dir_key.type) | |
1834 | goto next_type; | |
1835 | ||
1836 | if (found_key.offset > range_end) | |
1837 | break; | |
1838 | ||
1839 | ret = check_item_in_log(trans, root, log, path, | |
12fcfd22 CM |
1840 | log_path, dir, |
1841 | &found_key); | |
e02119d5 CM |
1842 | BUG_ON(ret); |
1843 | if (found_key.offset == (u64)-1) | |
1844 | break; | |
1845 | dir_key.offset = found_key.offset + 1; | |
1846 | } | |
b3b4aa74 | 1847 | btrfs_release_path(path); |
e02119d5 CM |
1848 | if (range_end == (u64)-1) |
1849 | break; | |
1850 | range_start = range_end + 1; | |
1851 | } | |
1852 | ||
1853 | next_type: | |
1854 | ret = 0; | |
1855 | if (key_type == BTRFS_DIR_LOG_ITEM_KEY) { | |
1856 | key_type = BTRFS_DIR_LOG_INDEX_KEY; | |
1857 | dir_key.type = BTRFS_DIR_INDEX_KEY; | |
b3b4aa74 | 1858 | btrfs_release_path(path); |
e02119d5 CM |
1859 | goto again; |
1860 | } | |
1861 | out: | |
b3b4aa74 | 1862 | btrfs_release_path(path); |
e02119d5 CM |
1863 | btrfs_free_path(log_path); |
1864 | iput(dir); | |
1865 | return ret; | |
1866 | } | |
1867 | ||
1868 | /* | |
1869 | * the process_func used to replay items from the log tree. This | |
1870 | * gets called in two different stages. The first stage just looks | |
1871 | * for inodes and makes sure they are all copied into the subvolume. | |
1872 | * | |
1873 | * The second stage copies all the other item types from the log into | |
1874 | * the subvolume. The two stage approach is slower, but gets rid of | |
1875 | * lots of complexity around inodes referencing other inodes that exist | |
1876 | * only in the log (references come from either directory items or inode | |
1877 | * back refs). | |
1878 | */ | |
1879 | static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb, | |
1880 | struct walk_control *wc, u64 gen) | |
1881 | { | |
1882 | int nritems; | |
1883 | struct btrfs_path *path; | |
1884 | struct btrfs_root *root = wc->replay_dest; | |
1885 | struct btrfs_key key; | |
e02119d5 CM |
1886 | int level; |
1887 | int i; | |
1888 | int ret; | |
1889 | ||
018642a1 TI |
1890 | ret = btrfs_read_buffer(eb, gen); |
1891 | if (ret) | |
1892 | return ret; | |
e02119d5 CM |
1893 | |
1894 | level = btrfs_header_level(eb); | |
1895 | ||
1896 | if (level != 0) | |
1897 | return 0; | |
1898 | ||
1899 | path = btrfs_alloc_path(); | |
1e5063d0 MF |
1900 | if (!path) |
1901 | return -ENOMEM; | |
e02119d5 CM |
1902 | |
1903 | nritems = btrfs_header_nritems(eb); | |
1904 | for (i = 0; i < nritems; i++) { | |
1905 | btrfs_item_key_to_cpu(eb, &key, i); | |
e02119d5 CM |
1906 | |
1907 | /* inode keys are done during the first stage */ | |
1908 | if (key.type == BTRFS_INODE_ITEM_KEY && | |
1909 | wc->stage == LOG_WALK_REPLAY_INODES) { | |
e02119d5 CM |
1910 | struct btrfs_inode_item *inode_item; |
1911 | u32 mode; | |
1912 | ||
1913 | inode_item = btrfs_item_ptr(eb, i, | |
1914 | struct btrfs_inode_item); | |
1915 | mode = btrfs_inode_mode(eb, inode_item); | |
1916 | if (S_ISDIR(mode)) { | |
1917 | ret = replay_dir_deletes(wc->trans, | |
12fcfd22 | 1918 | root, log, path, key.objectid, 0); |
e02119d5 CM |
1919 | BUG_ON(ret); |
1920 | } | |
1921 | ret = overwrite_item(wc->trans, root, path, | |
1922 | eb, i, &key); | |
1923 | BUG_ON(ret); | |
1924 | ||
c71bf099 YZ |
1925 | /* for regular files, make sure corresponding |
1926 | * orhpan item exist. extents past the new EOF | |
1927 | * will be truncated later by orphan cleanup. | |
e02119d5 CM |
1928 | */ |
1929 | if (S_ISREG(mode)) { | |
c71bf099 YZ |
1930 | ret = insert_orphan_item(wc->trans, root, |
1931 | key.objectid); | |
e02119d5 | 1932 | BUG_ON(ret); |
e02119d5 | 1933 | } |
c71bf099 | 1934 | |
e02119d5 CM |
1935 | ret = link_to_fixup_dir(wc->trans, root, |
1936 | path, key.objectid); | |
1937 | BUG_ON(ret); | |
1938 | } | |
1939 | if (wc->stage < LOG_WALK_REPLAY_ALL) | |
1940 | continue; | |
1941 | ||
1942 | /* these keys are simply copied */ | |
1943 | if (key.type == BTRFS_XATTR_ITEM_KEY) { | |
1944 | ret = overwrite_item(wc->trans, root, path, | |
1945 | eb, i, &key); | |
1946 | BUG_ON(ret); | |
1947 | } else if (key.type == BTRFS_INODE_REF_KEY) { | |
1948 | ret = add_inode_ref(wc->trans, root, log, path, | |
1949 | eb, i, &key); | |
1950 | BUG_ON(ret && ret != -ENOENT); | |
f186373f MF |
1951 | } else if (key.type == BTRFS_INODE_EXTREF_KEY) { |
1952 | ret = add_inode_ref(wc->trans, root, log, path, | |
1953 | eb, i, &key); | |
1954 | BUG_ON(ret && ret != -ENOENT); | |
e02119d5 CM |
1955 | } else if (key.type == BTRFS_EXTENT_DATA_KEY) { |
1956 | ret = replay_one_extent(wc->trans, root, path, | |
1957 | eb, i, &key); | |
1958 | BUG_ON(ret); | |
e02119d5 CM |
1959 | } else if (key.type == BTRFS_DIR_ITEM_KEY || |
1960 | key.type == BTRFS_DIR_INDEX_KEY) { | |
1961 | ret = replay_one_dir_item(wc->trans, root, path, | |
1962 | eb, i, &key); | |
1963 | BUG_ON(ret); | |
1964 | } | |
1965 | } | |
1966 | btrfs_free_path(path); | |
1967 | return 0; | |
1968 | } | |
1969 | ||
d397712b | 1970 | static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans, |
e02119d5 CM |
1971 | struct btrfs_root *root, |
1972 | struct btrfs_path *path, int *level, | |
1973 | struct walk_control *wc) | |
1974 | { | |
1975 | u64 root_owner; | |
e02119d5 CM |
1976 | u64 bytenr; |
1977 | u64 ptr_gen; | |
1978 | struct extent_buffer *next; | |
1979 | struct extent_buffer *cur; | |
1980 | struct extent_buffer *parent; | |
1981 | u32 blocksize; | |
1982 | int ret = 0; | |
1983 | ||
1984 | WARN_ON(*level < 0); | |
1985 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
1986 | ||
d397712b | 1987 | while (*level > 0) { |
e02119d5 CM |
1988 | WARN_ON(*level < 0); |
1989 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
1990 | cur = path->nodes[*level]; | |
1991 | ||
1992 | if (btrfs_header_level(cur) != *level) | |
1993 | WARN_ON(1); | |
1994 | ||
1995 | if (path->slots[*level] >= | |
1996 | btrfs_header_nritems(cur)) | |
1997 | break; | |
1998 | ||
1999 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); | |
2000 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); | |
2001 | blocksize = btrfs_level_size(root, *level - 1); | |
2002 | ||
2003 | parent = path->nodes[*level]; | |
2004 | root_owner = btrfs_header_owner(parent); | |
e02119d5 CM |
2005 | |
2006 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
2a29edc6 | 2007 | if (!next) |
2008 | return -ENOMEM; | |
e02119d5 | 2009 | |
e02119d5 | 2010 | if (*level == 1) { |
1e5063d0 MF |
2011 | ret = wc->process_func(root, next, wc, ptr_gen); |
2012 | if (ret) | |
2013 | return ret; | |
4a500fd1 | 2014 | |
e02119d5 CM |
2015 | path->slots[*level]++; |
2016 | if (wc->free) { | |
018642a1 TI |
2017 | ret = btrfs_read_buffer(next, ptr_gen); |
2018 | if (ret) { | |
2019 | free_extent_buffer(next); | |
2020 | return ret; | |
2021 | } | |
e02119d5 CM |
2022 | |
2023 | btrfs_tree_lock(next); | |
b4ce94de | 2024 | btrfs_set_lock_blocking(next); |
bd681513 | 2025 | clean_tree_block(trans, root, next); |
e02119d5 CM |
2026 | btrfs_wait_tree_block_writeback(next); |
2027 | btrfs_tree_unlock(next); | |
2028 | ||
e02119d5 CM |
2029 | WARN_ON(root_owner != |
2030 | BTRFS_TREE_LOG_OBJECTID); | |
e688b725 | 2031 | ret = btrfs_free_and_pin_reserved_extent(root, |
d00aff00 | 2032 | bytenr, blocksize); |
79787eaa | 2033 | BUG_ON(ret); /* -ENOMEM or logic errors */ |
e02119d5 CM |
2034 | } |
2035 | free_extent_buffer(next); | |
2036 | continue; | |
2037 | } | |
018642a1 TI |
2038 | ret = btrfs_read_buffer(next, ptr_gen); |
2039 | if (ret) { | |
2040 | free_extent_buffer(next); | |
2041 | return ret; | |
2042 | } | |
e02119d5 CM |
2043 | |
2044 | WARN_ON(*level <= 0); | |
2045 | if (path->nodes[*level-1]) | |
2046 | free_extent_buffer(path->nodes[*level-1]); | |
2047 | path->nodes[*level-1] = next; | |
2048 | *level = btrfs_header_level(next); | |
2049 | path->slots[*level] = 0; | |
2050 | cond_resched(); | |
2051 | } | |
2052 | WARN_ON(*level < 0); | |
2053 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
2054 | ||
4a500fd1 | 2055 | path->slots[*level] = btrfs_header_nritems(path->nodes[*level]); |
e02119d5 CM |
2056 | |
2057 | cond_resched(); | |
2058 | return 0; | |
2059 | } | |
2060 | ||
d397712b | 2061 | static noinline int walk_up_log_tree(struct btrfs_trans_handle *trans, |
e02119d5 CM |
2062 | struct btrfs_root *root, |
2063 | struct btrfs_path *path, int *level, | |
2064 | struct walk_control *wc) | |
2065 | { | |
2066 | u64 root_owner; | |
e02119d5 CM |
2067 | int i; |
2068 | int slot; | |
2069 | int ret; | |
2070 | ||
d397712b | 2071 | for (i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { |
e02119d5 | 2072 | slot = path->slots[i]; |
4a500fd1 | 2073 | if (slot + 1 < btrfs_header_nritems(path->nodes[i])) { |
e02119d5 CM |
2074 | path->slots[i]++; |
2075 | *level = i; | |
2076 | WARN_ON(*level == 0); | |
2077 | return 0; | |
2078 | } else { | |
31840ae1 ZY |
2079 | struct extent_buffer *parent; |
2080 | if (path->nodes[*level] == root->node) | |
2081 | parent = path->nodes[*level]; | |
2082 | else | |
2083 | parent = path->nodes[*level + 1]; | |
2084 | ||
2085 | root_owner = btrfs_header_owner(parent); | |
1e5063d0 | 2086 | ret = wc->process_func(root, path->nodes[*level], wc, |
e02119d5 | 2087 | btrfs_header_generation(path->nodes[*level])); |
1e5063d0 MF |
2088 | if (ret) |
2089 | return ret; | |
2090 | ||
e02119d5 CM |
2091 | if (wc->free) { |
2092 | struct extent_buffer *next; | |
2093 | ||
2094 | next = path->nodes[*level]; | |
2095 | ||
2096 | btrfs_tree_lock(next); | |
b4ce94de | 2097 | btrfs_set_lock_blocking(next); |
bd681513 | 2098 | clean_tree_block(trans, root, next); |
e02119d5 CM |
2099 | btrfs_wait_tree_block_writeback(next); |
2100 | btrfs_tree_unlock(next); | |
2101 | ||
e02119d5 | 2102 | WARN_ON(root_owner != BTRFS_TREE_LOG_OBJECTID); |
e688b725 | 2103 | ret = btrfs_free_and_pin_reserved_extent(root, |
e02119d5 | 2104 | path->nodes[*level]->start, |
d00aff00 | 2105 | path->nodes[*level]->len); |
e02119d5 CM |
2106 | BUG_ON(ret); |
2107 | } | |
2108 | free_extent_buffer(path->nodes[*level]); | |
2109 | path->nodes[*level] = NULL; | |
2110 | *level = i + 1; | |
2111 | } | |
2112 | } | |
2113 | return 1; | |
2114 | } | |
2115 | ||
2116 | /* | |
2117 | * drop the reference count on the tree rooted at 'snap'. This traverses | |
2118 | * the tree freeing any blocks that have a ref count of zero after being | |
2119 | * decremented. | |
2120 | */ | |
2121 | static int walk_log_tree(struct btrfs_trans_handle *trans, | |
2122 | struct btrfs_root *log, struct walk_control *wc) | |
2123 | { | |
2124 | int ret = 0; | |
2125 | int wret; | |
2126 | int level; | |
2127 | struct btrfs_path *path; | |
2128 | int i; | |
2129 | int orig_level; | |
2130 | ||
2131 | path = btrfs_alloc_path(); | |
db5b493a TI |
2132 | if (!path) |
2133 | return -ENOMEM; | |
e02119d5 CM |
2134 | |
2135 | level = btrfs_header_level(log->node); | |
2136 | orig_level = level; | |
2137 | path->nodes[level] = log->node; | |
2138 | extent_buffer_get(log->node); | |
2139 | path->slots[level] = 0; | |
2140 | ||
d397712b | 2141 | while (1) { |
e02119d5 CM |
2142 | wret = walk_down_log_tree(trans, log, path, &level, wc); |
2143 | if (wret > 0) | |
2144 | break; | |
79787eaa | 2145 | if (wret < 0) { |
e02119d5 | 2146 | ret = wret; |
79787eaa JM |
2147 | goto out; |
2148 | } | |
e02119d5 CM |
2149 | |
2150 | wret = walk_up_log_tree(trans, log, path, &level, wc); | |
2151 | if (wret > 0) | |
2152 | break; | |
79787eaa | 2153 | if (wret < 0) { |
e02119d5 | 2154 | ret = wret; |
79787eaa JM |
2155 | goto out; |
2156 | } | |
e02119d5 CM |
2157 | } |
2158 | ||
2159 | /* was the root node processed? if not, catch it here */ | |
2160 | if (path->nodes[orig_level]) { | |
79787eaa | 2161 | ret = wc->process_func(log, path->nodes[orig_level], wc, |
e02119d5 | 2162 | btrfs_header_generation(path->nodes[orig_level])); |
79787eaa JM |
2163 | if (ret) |
2164 | goto out; | |
e02119d5 CM |
2165 | if (wc->free) { |
2166 | struct extent_buffer *next; | |
2167 | ||
2168 | next = path->nodes[orig_level]; | |
2169 | ||
2170 | btrfs_tree_lock(next); | |
b4ce94de | 2171 | btrfs_set_lock_blocking(next); |
bd681513 | 2172 | clean_tree_block(trans, log, next); |
e02119d5 CM |
2173 | btrfs_wait_tree_block_writeback(next); |
2174 | btrfs_tree_unlock(next); | |
2175 | ||
e02119d5 CM |
2176 | WARN_ON(log->root_key.objectid != |
2177 | BTRFS_TREE_LOG_OBJECTID); | |
e688b725 | 2178 | ret = btrfs_free_and_pin_reserved_extent(log, next->start, |
d00aff00 | 2179 | next->len); |
79787eaa | 2180 | BUG_ON(ret); /* -ENOMEM or logic errors */ |
e02119d5 CM |
2181 | } |
2182 | } | |
2183 | ||
79787eaa | 2184 | out: |
e02119d5 CM |
2185 | for (i = 0; i <= orig_level; i++) { |
2186 | if (path->nodes[i]) { | |
2187 | free_extent_buffer(path->nodes[i]); | |
2188 | path->nodes[i] = NULL; | |
2189 | } | |
2190 | } | |
2191 | btrfs_free_path(path); | |
e02119d5 CM |
2192 | return ret; |
2193 | } | |
2194 | ||
7237f183 YZ |
2195 | /* |
2196 | * helper function to update the item for a given subvolumes log root | |
2197 | * in the tree of log roots | |
2198 | */ | |
2199 | static int update_log_root(struct btrfs_trans_handle *trans, | |
2200 | struct btrfs_root *log) | |
2201 | { | |
2202 | int ret; | |
2203 | ||
2204 | if (log->log_transid == 1) { | |
2205 | /* insert root item on the first sync */ | |
2206 | ret = btrfs_insert_root(trans, log->fs_info->log_root_tree, | |
2207 | &log->root_key, &log->root_item); | |
2208 | } else { | |
2209 | ret = btrfs_update_root(trans, log->fs_info->log_root_tree, | |
2210 | &log->root_key, &log->root_item); | |
2211 | } | |
2212 | return ret; | |
2213 | } | |
2214 | ||
12fcfd22 CM |
2215 | static int wait_log_commit(struct btrfs_trans_handle *trans, |
2216 | struct btrfs_root *root, unsigned long transid) | |
e02119d5 CM |
2217 | { |
2218 | DEFINE_WAIT(wait); | |
7237f183 | 2219 | int index = transid % 2; |
e02119d5 | 2220 | |
7237f183 YZ |
2221 | /* |
2222 | * we only allow two pending log transactions at a time, | |
2223 | * so we know that if ours is more than 2 older than the | |
2224 | * current transaction, we're done | |
2225 | */ | |
e02119d5 | 2226 | do { |
7237f183 YZ |
2227 | prepare_to_wait(&root->log_commit_wait[index], |
2228 | &wait, TASK_UNINTERRUPTIBLE); | |
2229 | mutex_unlock(&root->log_mutex); | |
12fcfd22 CM |
2230 | |
2231 | if (root->fs_info->last_trans_log_full_commit != | |
2232 | trans->transid && root->log_transid < transid + 2 && | |
7237f183 YZ |
2233 | atomic_read(&root->log_commit[index])) |
2234 | schedule(); | |
12fcfd22 | 2235 | |
7237f183 YZ |
2236 | finish_wait(&root->log_commit_wait[index], &wait); |
2237 | mutex_lock(&root->log_mutex); | |
6dd70ce4 JK |
2238 | } while (root->fs_info->last_trans_log_full_commit != |
2239 | trans->transid && root->log_transid < transid + 2 && | |
7237f183 YZ |
2240 | atomic_read(&root->log_commit[index])); |
2241 | return 0; | |
2242 | } | |
2243 | ||
143bede5 JM |
2244 | static void wait_for_writer(struct btrfs_trans_handle *trans, |
2245 | struct btrfs_root *root) | |
7237f183 YZ |
2246 | { |
2247 | DEFINE_WAIT(wait); | |
6dd70ce4 JK |
2248 | while (root->fs_info->last_trans_log_full_commit != |
2249 | trans->transid && atomic_read(&root->log_writers)) { | |
7237f183 YZ |
2250 | prepare_to_wait(&root->log_writer_wait, |
2251 | &wait, TASK_UNINTERRUPTIBLE); | |
2252 | mutex_unlock(&root->log_mutex); | |
12fcfd22 CM |
2253 | if (root->fs_info->last_trans_log_full_commit != |
2254 | trans->transid && atomic_read(&root->log_writers)) | |
e02119d5 | 2255 | schedule(); |
7237f183 YZ |
2256 | mutex_lock(&root->log_mutex); |
2257 | finish_wait(&root->log_writer_wait, &wait); | |
2258 | } | |
e02119d5 CM |
2259 | } |
2260 | ||
2261 | /* | |
2262 | * btrfs_sync_log does sends a given tree log down to the disk and | |
2263 | * updates the super blocks to record it. When this call is done, | |
12fcfd22 CM |
2264 | * you know that any inodes previously logged are safely on disk only |
2265 | * if it returns 0. | |
2266 | * | |
2267 | * Any other return value means you need to call btrfs_commit_transaction. | |
2268 | * Some of the edge cases for fsyncing directories that have had unlinks | |
2269 | * or renames done in the past mean that sometimes the only safe | |
2270 | * fsync is to commit the whole FS. When btrfs_sync_log returns -EAGAIN, | |
2271 | * that has happened. | |
e02119d5 CM |
2272 | */ |
2273 | int btrfs_sync_log(struct btrfs_trans_handle *trans, | |
2274 | struct btrfs_root *root) | |
2275 | { | |
7237f183 YZ |
2276 | int index1; |
2277 | int index2; | |
8cef4e16 | 2278 | int mark; |
e02119d5 | 2279 | int ret; |
e02119d5 | 2280 | struct btrfs_root *log = root->log_root; |
7237f183 | 2281 | struct btrfs_root *log_root_tree = root->fs_info->log_root_tree; |
8cef4e16 | 2282 | unsigned long log_transid = 0; |
e02119d5 | 2283 | |
7237f183 | 2284 | mutex_lock(&root->log_mutex); |
2ab28f32 | 2285 | log_transid = root->log_transid; |
7237f183 YZ |
2286 | index1 = root->log_transid % 2; |
2287 | if (atomic_read(&root->log_commit[index1])) { | |
12fcfd22 | 2288 | wait_log_commit(trans, root, root->log_transid); |
7237f183 YZ |
2289 | mutex_unlock(&root->log_mutex); |
2290 | return 0; | |
e02119d5 | 2291 | } |
7237f183 YZ |
2292 | atomic_set(&root->log_commit[index1], 1); |
2293 | ||
2294 | /* wait for previous tree log sync to complete */ | |
2295 | if (atomic_read(&root->log_commit[(index1 + 1) % 2])) | |
12fcfd22 | 2296 | wait_log_commit(trans, root, root->log_transid - 1); |
86df7eb9 | 2297 | while (1) { |
2ecb7923 | 2298 | int batch = atomic_read(&root->log_batch); |
cd354ad6 CM |
2299 | /* when we're on an ssd, just kick the log commit out */ |
2300 | if (!btrfs_test_opt(root, SSD) && root->log_multiple_pids) { | |
86df7eb9 YZ |
2301 | mutex_unlock(&root->log_mutex); |
2302 | schedule_timeout_uninterruptible(1); | |
2303 | mutex_lock(&root->log_mutex); | |
2304 | } | |
12fcfd22 | 2305 | wait_for_writer(trans, root); |
2ecb7923 | 2306 | if (batch == atomic_read(&root->log_batch)) |
e02119d5 CM |
2307 | break; |
2308 | } | |
e02119d5 | 2309 | |
12fcfd22 CM |
2310 | /* bail out if we need to do a full commit */ |
2311 | if (root->fs_info->last_trans_log_full_commit == trans->transid) { | |
2312 | ret = -EAGAIN; | |
2ab28f32 | 2313 | btrfs_free_logged_extents(log, log_transid); |
12fcfd22 CM |
2314 | mutex_unlock(&root->log_mutex); |
2315 | goto out; | |
2316 | } | |
2317 | ||
8cef4e16 YZ |
2318 | if (log_transid % 2 == 0) |
2319 | mark = EXTENT_DIRTY; | |
2320 | else | |
2321 | mark = EXTENT_NEW; | |
2322 | ||
690587d1 CM |
2323 | /* we start IO on all the marked extents here, but we don't actually |
2324 | * wait for them until later. | |
2325 | */ | |
8cef4e16 | 2326 | ret = btrfs_write_marked_extents(log, &log->dirty_log_pages, mark); |
79787eaa JM |
2327 | if (ret) { |
2328 | btrfs_abort_transaction(trans, root, ret); | |
2ab28f32 | 2329 | btrfs_free_logged_extents(log, log_transid); |
79787eaa JM |
2330 | mutex_unlock(&root->log_mutex); |
2331 | goto out; | |
2332 | } | |
7237f183 | 2333 | |
5d4f98a2 | 2334 | btrfs_set_root_node(&log->root_item, log->node); |
7237f183 | 2335 | |
7237f183 YZ |
2336 | root->log_transid++; |
2337 | log->log_transid = root->log_transid; | |
ff782e0a | 2338 | root->log_start_pid = 0; |
7237f183 YZ |
2339 | smp_mb(); |
2340 | /* | |
8cef4e16 YZ |
2341 | * IO has been started, blocks of the log tree have WRITTEN flag set |
2342 | * in their headers. new modifications of the log will be written to | |
2343 | * new positions. so it's safe to allow log writers to go in. | |
7237f183 YZ |
2344 | */ |
2345 | mutex_unlock(&root->log_mutex); | |
2346 | ||
2347 | mutex_lock(&log_root_tree->log_mutex); | |
2ecb7923 | 2348 | atomic_inc(&log_root_tree->log_batch); |
7237f183 YZ |
2349 | atomic_inc(&log_root_tree->log_writers); |
2350 | mutex_unlock(&log_root_tree->log_mutex); | |
2351 | ||
2352 | ret = update_log_root(trans, log); | |
7237f183 YZ |
2353 | |
2354 | mutex_lock(&log_root_tree->log_mutex); | |
2355 | if (atomic_dec_and_test(&log_root_tree->log_writers)) { | |
2356 | smp_mb(); | |
2357 | if (waitqueue_active(&log_root_tree->log_writer_wait)) | |
2358 | wake_up(&log_root_tree->log_writer_wait); | |
2359 | } | |
2360 | ||
4a500fd1 | 2361 | if (ret) { |
79787eaa JM |
2362 | if (ret != -ENOSPC) { |
2363 | btrfs_abort_transaction(trans, root, ret); | |
2364 | mutex_unlock(&log_root_tree->log_mutex); | |
2365 | goto out; | |
2366 | } | |
4a500fd1 YZ |
2367 | root->fs_info->last_trans_log_full_commit = trans->transid; |
2368 | btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); | |
2ab28f32 | 2369 | btrfs_free_logged_extents(log, log_transid); |
4a500fd1 YZ |
2370 | mutex_unlock(&log_root_tree->log_mutex); |
2371 | ret = -EAGAIN; | |
2372 | goto out; | |
2373 | } | |
2374 | ||
7237f183 YZ |
2375 | index2 = log_root_tree->log_transid % 2; |
2376 | if (atomic_read(&log_root_tree->log_commit[index2])) { | |
8cef4e16 | 2377 | btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); |
12fcfd22 CM |
2378 | wait_log_commit(trans, log_root_tree, |
2379 | log_root_tree->log_transid); | |
2ab28f32 | 2380 | btrfs_free_logged_extents(log, log_transid); |
7237f183 | 2381 | mutex_unlock(&log_root_tree->log_mutex); |
b31eabd8 | 2382 | ret = 0; |
7237f183 YZ |
2383 | goto out; |
2384 | } | |
2385 | atomic_set(&log_root_tree->log_commit[index2], 1); | |
2386 | ||
12fcfd22 CM |
2387 | if (atomic_read(&log_root_tree->log_commit[(index2 + 1) % 2])) { |
2388 | wait_log_commit(trans, log_root_tree, | |
2389 | log_root_tree->log_transid - 1); | |
2390 | } | |
2391 | ||
2392 | wait_for_writer(trans, log_root_tree); | |
7237f183 | 2393 | |
12fcfd22 CM |
2394 | /* |
2395 | * now that we've moved on to the tree of log tree roots, | |
2396 | * check the full commit flag again | |
2397 | */ | |
2398 | if (root->fs_info->last_trans_log_full_commit == trans->transid) { | |
8cef4e16 | 2399 | btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); |
2ab28f32 | 2400 | btrfs_free_logged_extents(log, log_transid); |
12fcfd22 CM |
2401 | mutex_unlock(&log_root_tree->log_mutex); |
2402 | ret = -EAGAIN; | |
2403 | goto out_wake_log_root; | |
2404 | } | |
7237f183 YZ |
2405 | |
2406 | ret = btrfs_write_and_wait_marked_extents(log_root_tree, | |
8cef4e16 YZ |
2407 | &log_root_tree->dirty_log_pages, |
2408 | EXTENT_DIRTY | EXTENT_NEW); | |
79787eaa JM |
2409 | if (ret) { |
2410 | btrfs_abort_transaction(trans, root, ret); | |
2ab28f32 | 2411 | btrfs_free_logged_extents(log, log_transid); |
79787eaa JM |
2412 | mutex_unlock(&log_root_tree->log_mutex); |
2413 | goto out_wake_log_root; | |
2414 | } | |
8cef4e16 | 2415 | btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); |
2ab28f32 | 2416 | btrfs_wait_logged_extents(log, log_transid); |
e02119d5 | 2417 | |
6c41761f | 2418 | btrfs_set_super_log_root(root->fs_info->super_for_commit, |
7237f183 | 2419 | log_root_tree->node->start); |
6c41761f | 2420 | btrfs_set_super_log_root_level(root->fs_info->super_for_commit, |
7237f183 | 2421 | btrfs_header_level(log_root_tree->node)); |
e02119d5 | 2422 | |
7237f183 | 2423 | log_root_tree->log_transid++; |
e02119d5 | 2424 | smp_mb(); |
7237f183 YZ |
2425 | |
2426 | mutex_unlock(&log_root_tree->log_mutex); | |
2427 | ||
2428 | /* | |
2429 | * nobody else is going to jump in and write the the ctree | |
2430 | * super here because the log_commit atomic below is protecting | |
2431 | * us. We must be called with a transaction handle pinning | |
2432 | * the running transaction open, so a full commit can't hop | |
2433 | * in and cause problems either. | |
2434 | */ | |
a2de733c | 2435 | btrfs_scrub_pause_super(root); |
5af3e8cc | 2436 | ret = write_ctree_super(trans, root->fs_info->tree_root, 1); |
a2de733c | 2437 | btrfs_scrub_continue_super(root); |
5af3e8cc SB |
2438 | if (ret) { |
2439 | btrfs_abort_transaction(trans, root, ret); | |
2440 | goto out_wake_log_root; | |
2441 | } | |
7237f183 | 2442 | |
257c62e1 CM |
2443 | mutex_lock(&root->log_mutex); |
2444 | if (root->last_log_commit < log_transid) | |
2445 | root->last_log_commit = log_transid; | |
2446 | mutex_unlock(&root->log_mutex); | |
2447 | ||
12fcfd22 | 2448 | out_wake_log_root: |
7237f183 YZ |
2449 | atomic_set(&log_root_tree->log_commit[index2], 0); |
2450 | smp_mb(); | |
2451 | if (waitqueue_active(&log_root_tree->log_commit_wait[index2])) | |
2452 | wake_up(&log_root_tree->log_commit_wait[index2]); | |
e02119d5 | 2453 | out: |
7237f183 YZ |
2454 | atomic_set(&root->log_commit[index1], 0); |
2455 | smp_mb(); | |
2456 | if (waitqueue_active(&root->log_commit_wait[index1])) | |
2457 | wake_up(&root->log_commit_wait[index1]); | |
b31eabd8 | 2458 | return ret; |
e02119d5 CM |
2459 | } |
2460 | ||
4a500fd1 YZ |
2461 | static void free_log_tree(struct btrfs_trans_handle *trans, |
2462 | struct btrfs_root *log) | |
e02119d5 CM |
2463 | { |
2464 | int ret; | |
d0c803c4 CM |
2465 | u64 start; |
2466 | u64 end; | |
e02119d5 CM |
2467 | struct walk_control wc = { |
2468 | .free = 1, | |
2469 | .process_func = process_one_buffer | |
2470 | }; | |
2471 | ||
3321719e LB |
2472 | if (trans) { |
2473 | ret = walk_log_tree(trans, log, &wc); | |
2474 | BUG_ON(ret); | |
2475 | } | |
e02119d5 | 2476 | |
d397712b | 2477 | while (1) { |
d0c803c4 | 2478 | ret = find_first_extent_bit(&log->dirty_log_pages, |
e6138876 JB |
2479 | 0, &start, &end, EXTENT_DIRTY | EXTENT_NEW, |
2480 | NULL); | |
d0c803c4 CM |
2481 | if (ret) |
2482 | break; | |
2483 | ||
8cef4e16 YZ |
2484 | clear_extent_bits(&log->dirty_log_pages, start, end, |
2485 | EXTENT_DIRTY | EXTENT_NEW, GFP_NOFS); | |
d0c803c4 CM |
2486 | } |
2487 | ||
2ab28f32 JB |
2488 | /* |
2489 | * We may have short-circuited the log tree with the full commit logic | |
2490 | * and left ordered extents on our list, so clear these out to keep us | |
2491 | * from leaking inodes and memory. | |
2492 | */ | |
2493 | btrfs_free_logged_extents(log, 0); | |
2494 | btrfs_free_logged_extents(log, 1); | |
2495 | ||
7237f183 YZ |
2496 | free_extent_buffer(log->node); |
2497 | kfree(log); | |
4a500fd1 YZ |
2498 | } |
2499 | ||
2500 | /* | |
2501 | * free all the extents used by the tree log. This should be called | |
2502 | * at commit time of the full transaction | |
2503 | */ | |
2504 | int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root) | |
2505 | { | |
2506 | if (root->log_root) { | |
2507 | free_log_tree(trans, root->log_root); | |
2508 | root->log_root = NULL; | |
2509 | } | |
2510 | return 0; | |
2511 | } | |
2512 | ||
2513 | int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, | |
2514 | struct btrfs_fs_info *fs_info) | |
2515 | { | |
2516 | if (fs_info->log_root_tree) { | |
2517 | free_log_tree(trans, fs_info->log_root_tree); | |
2518 | fs_info->log_root_tree = NULL; | |
2519 | } | |
e02119d5 CM |
2520 | return 0; |
2521 | } | |
2522 | ||
e02119d5 CM |
2523 | /* |
2524 | * If both a file and directory are logged, and unlinks or renames are | |
2525 | * mixed in, we have a few interesting corners: | |
2526 | * | |
2527 | * create file X in dir Y | |
2528 | * link file X to X.link in dir Y | |
2529 | * fsync file X | |
2530 | * unlink file X but leave X.link | |
2531 | * fsync dir Y | |
2532 | * | |
2533 | * After a crash we would expect only X.link to exist. But file X | |
2534 | * didn't get fsync'd again so the log has back refs for X and X.link. | |
2535 | * | |
2536 | * We solve this by removing directory entries and inode backrefs from the | |
2537 | * log when a file that was logged in the current transaction is | |
2538 | * unlinked. Any later fsync will include the updated log entries, and | |
2539 | * we'll be able to reconstruct the proper directory items from backrefs. | |
2540 | * | |
2541 | * This optimizations allows us to avoid relogging the entire inode | |
2542 | * or the entire directory. | |
2543 | */ | |
2544 | int btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans, | |
2545 | struct btrfs_root *root, | |
2546 | const char *name, int name_len, | |
2547 | struct inode *dir, u64 index) | |
2548 | { | |
2549 | struct btrfs_root *log; | |
2550 | struct btrfs_dir_item *di; | |
2551 | struct btrfs_path *path; | |
2552 | int ret; | |
4a500fd1 | 2553 | int err = 0; |
e02119d5 | 2554 | int bytes_del = 0; |
33345d01 | 2555 | u64 dir_ino = btrfs_ino(dir); |
e02119d5 | 2556 | |
3a5f1d45 CM |
2557 | if (BTRFS_I(dir)->logged_trans < trans->transid) |
2558 | return 0; | |
2559 | ||
e02119d5 CM |
2560 | ret = join_running_log_trans(root); |
2561 | if (ret) | |
2562 | return 0; | |
2563 | ||
2564 | mutex_lock(&BTRFS_I(dir)->log_mutex); | |
2565 | ||
2566 | log = root->log_root; | |
2567 | path = btrfs_alloc_path(); | |
a62f44a5 TI |
2568 | if (!path) { |
2569 | err = -ENOMEM; | |
2570 | goto out_unlock; | |
2571 | } | |
2a29edc6 | 2572 | |
33345d01 | 2573 | di = btrfs_lookup_dir_item(trans, log, path, dir_ino, |
e02119d5 | 2574 | name, name_len, -1); |
4a500fd1 YZ |
2575 | if (IS_ERR(di)) { |
2576 | err = PTR_ERR(di); | |
2577 | goto fail; | |
2578 | } | |
2579 | if (di) { | |
e02119d5 CM |
2580 | ret = btrfs_delete_one_dir_name(trans, log, path, di); |
2581 | bytes_del += name_len; | |
2582 | BUG_ON(ret); | |
2583 | } | |
b3b4aa74 | 2584 | btrfs_release_path(path); |
33345d01 | 2585 | di = btrfs_lookup_dir_index_item(trans, log, path, dir_ino, |
e02119d5 | 2586 | index, name, name_len, -1); |
4a500fd1 YZ |
2587 | if (IS_ERR(di)) { |
2588 | err = PTR_ERR(di); | |
2589 | goto fail; | |
2590 | } | |
2591 | if (di) { | |
e02119d5 CM |
2592 | ret = btrfs_delete_one_dir_name(trans, log, path, di); |
2593 | bytes_del += name_len; | |
2594 | BUG_ON(ret); | |
2595 | } | |
2596 | ||
2597 | /* update the directory size in the log to reflect the names | |
2598 | * we have removed | |
2599 | */ | |
2600 | if (bytes_del) { | |
2601 | struct btrfs_key key; | |
2602 | ||
33345d01 | 2603 | key.objectid = dir_ino; |
e02119d5 CM |
2604 | key.offset = 0; |
2605 | key.type = BTRFS_INODE_ITEM_KEY; | |
b3b4aa74 | 2606 | btrfs_release_path(path); |
e02119d5 CM |
2607 | |
2608 | ret = btrfs_search_slot(trans, log, &key, path, 0, 1); | |
4a500fd1 YZ |
2609 | if (ret < 0) { |
2610 | err = ret; | |
2611 | goto fail; | |
2612 | } | |
e02119d5 CM |
2613 | if (ret == 0) { |
2614 | struct btrfs_inode_item *item; | |
2615 | u64 i_size; | |
2616 | ||
2617 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
2618 | struct btrfs_inode_item); | |
2619 | i_size = btrfs_inode_size(path->nodes[0], item); | |
2620 | if (i_size > bytes_del) | |
2621 | i_size -= bytes_del; | |
2622 | else | |
2623 | i_size = 0; | |
2624 | btrfs_set_inode_size(path->nodes[0], item, i_size); | |
2625 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2626 | } else | |
2627 | ret = 0; | |
b3b4aa74 | 2628 | btrfs_release_path(path); |
e02119d5 | 2629 | } |
4a500fd1 | 2630 | fail: |
e02119d5 | 2631 | btrfs_free_path(path); |
a62f44a5 | 2632 | out_unlock: |
e02119d5 | 2633 | mutex_unlock(&BTRFS_I(dir)->log_mutex); |
4a500fd1 YZ |
2634 | if (ret == -ENOSPC) { |
2635 | root->fs_info->last_trans_log_full_commit = trans->transid; | |
2636 | ret = 0; | |
79787eaa JM |
2637 | } else if (ret < 0) |
2638 | btrfs_abort_transaction(trans, root, ret); | |
2639 | ||
12fcfd22 | 2640 | btrfs_end_log_trans(root); |
e02119d5 | 2641 | |
411fc6bc | 2642 | return err; |
e02119d5 CM |
2643 | } |
2644 | ||
2645 | /* see comments for btrfs_del_dir_entries_in_log */ | |
2646 | int btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans, | |
2647 | struct btrfs_root *root, | |
2648 | const char *name, int name_len, | |
2649 | struct inode *inode, u64 dirid) | |
2650 | { | |
2651 | struct btrfs_root *log; | |
2652 | u64 index; | |
2653 | int ret; | |
2654 | ||
3a5f1d45 CM |
2655 | if (BTRFS_I(inode)->logged_trans < trans->transid) |
2656 | return 0; | |
2657 | ||
e02119d5 CM |
2658 | ret = join_running_log_trans(root); |
2659 | if (ret) | |
2660 | return 0; | |
2661 | log = root->log_root; | |
2662 | mutex_lock(&BTRFS_I(inode)->log_mutex); | |
2663 | ||
33345d01 | 2664 | ret = btrfs_del_inode_ref(trans, log, name, name_len, btrfs_ino(inode), |
e02119d5 CM |
2665 | dirid, &index); |
2666 | mutex_unlock(&BTRFS_I(inode)->log_mutex); | |
4a500fd1 YZ |
2667 | if (ret == -ENOSPC) { |
2668 | root->fs_info->last_trans_log_full_commit = trans->transid; | |
2669 | ret = 0; | |
79787eaa JM |
2670 | } else if (ret < 0 && ret != -ENOENT) |
2671 | btrfs_abort_transaction(trans, root, ret); | |
12fcfd22 | 2672 | btrfs_end_log_trans(root); |
e02119d5 | 2673 | |
e02119d5 CM |
2674 | return ret; |
2675 | } | |
2676 | ||
2677 | /* | |
2678 | * creates a range item in the log for 'dirid'. first_offset and | |
2679 | * last_offset tell us which parts of the key space the log should | |
2680 | * be considered authoritative for. | |
2681 | */ | |
2682 | static noinline int insert_dir_log_key(struct btrfs_trans_handle *trans, | |
2683 | struct btrfs_root *log, | |
2684 | struct btrfs_path *path, | |
2685 | int key_type, u64 dirid, | |
2686 | u64 first_offset, u64 last_offset) | |
2687 | { | |
2688 | int ret; | |
2689 | struct btrfs_key key; | |
2690 | struct btrfs_dir_log_item *item; | |
2691 | ||
2692 | key.objectid = dirid; | |
2693 | key.offset = first_offset; | |
2694 | if (key_type == BTRFS_DIR_ITEM_KEY) | |
2695 | key.type = BTRFS_DIR_LOG_ITEM_KEY; | |
2696 | else | |
2697 | key.type = BTRFS_DIR_LOG_INDEX_KEY; | |
2698 | ret = btrfs_insert_empty_item(trans, log, path, &key, sizeof(*item)); | |
4a500fd1 YZ |
2699 | if (ret) |
2700 | return ret; | |
e02119d5 CM |
2701 | |
2702 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
2703 | struct btrfs_dir_log_item); | |
2704 | btrfs_set_dir_log_end(path->nodes[0], item, last_offset); | |
2705 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
b3b4aa74 | 2706 | btrfs_release_path(path); |
e02119d5 CM |
2707 | return 0; |
2708 | } | |
2709 | ||
2710 | /* | |
2711 | * log all the items included in the current transaction for a given | |
2712 | * directory. This also creates the range items in the log tree required | |
2713 | * to replay anything deleted before the fsync | |
2714 | */ | |
2715 | static noinline int log_dir_items(struct btrfs_trans_handle *trans, | |
2716 | struct btrfs_root *root, struct inode *inode, | |
2717 | struct btrfs_path *path, | |
2718 | struct btrfs_path *dst_path, int key_type, | |
2719 | u64 min_offset, u64 *last_offset_ret) | |
2720 | { | |
2721 | struct btrfs_key min_key; | |
2722 | struct btrfs_key max_key; | |
2723 | struct btrfs_root *log = root->log_root; | |
2724 | struct extent_buffer *src; | |
4a500fd1 | 2725 | int err = 0; |
e02119d5 CM |
2726 | int ret; |
2727 | int i; | |
2728 | int nritems; | |
2729 | u64 first_offset = min_offset; | |
2730 | u64 last_offset = (u64)-1; | |
33345d01 | 2731 | u64 ino = btrfs_ino(inode); |
e02119d5 CM |
2732 | |
2733 | log = root->log_root; | |
33345d01 | 2734 | max_key.objectid = ino; |
e02119d5 CM |
2735 | max_key.offset = (u64)-1; |
2736 | max_key.type = key_type; | |
2737 | ||
33345d01 | 2738 | min_key.objectid = ino; |
e02119d5 CM |
2739 | min_key.type = key_type; |
2740 | min_key.offset = min_offset; | |
2741 | ||
2742 | path->keep_locks = 1; | |
2743 | ||
2744 | ret = btrfs_search_forward(root, &min_key, &max_key, | |
de78b51a | 2745 | path, trans->transid); |
e02119d5 CM |
2746 | |
2747 | /* | |
2748 | * we didn't find anything from this transaction, see if there | |
2749 | * is anything at all | |
2750 | */ | |
33345d01 LZ |
2751 | if (ret != 0 || min_key.objectid != ino || min_key.type != key_type) { |
2752 | min_key.objectid = ino; | |
e02119d5 CM |
2753 | min_key.type = key_type; |
2754 | min_key.offset = (u64)-1; | |
b3b4aa74 | 2755 | btrfs_release_path(path); |
e02119d5 CM |
2756 | ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0); |
2757 | if (ret < 0) { | |
b3b4aa74 | 2758 | btrfs_release_path(path); |
e02119d5 CM |
2759 | return ret; |
2760 | } | |
33345d01 | 2761 | ret = btrfs_previous_item(root, path, ino, key_type); |
e02119d5 CM |
2762 | |
2763 | /* if ret == 0 there are items for this type, | |
2764 | * create a range to tell us the last key of this type. | |
2765 | * otherwise, there are no items in this directory after | |
2766 | * *min_offset, and we create a range to indicate that. | |
2767 | */ | |
2768 | if (ret == 0) { | |
2769 | struct btrfs_key tmp; | |
2770 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, | |
2771 | path->slots[0]); | |
d397712b | 2772 | if (key_type == tmp.type) |
e02119d5 | 2773 | first_offset = max(min_offset, tmp.offset) + 1; |
e02119d5 CM |
2774 | } |
2775 | goto done; | |
2776 | } | |
2777 | ||
2778 | /* go backward to find any previous key */ | |
33345d01 | 2779 | ret = btrfs_previous_item(root, path, ino, key_type); |
e02119d5 CM |
2780 | if (ret == 0) { |
2781 | struct btrfs_key tmp; | |
2782 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); | |
2783 | if (key_type == tmp.type) { | |
2784 | first_offset = tmp.offset; | |
2785 | ret = overwrite_item(trans, log, dst_path, | |
2786 | path->nodes[0], path->slots[0], | |
2787 | &tmp); | |
4a500fd1 YZ |
2788 | if (ret) { |
2789 | err = ret; | |
2790 | goto done; | |
2791 | } | |
e02119d5 CM |
2792 | } |
2793 | } | |
b3b4aa74 | 2794 | btrfs_release_path(path); |
e02119d5 CM |
2795 | |
2796 | /* find the first key from this transaction again */ | |
2797 | ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0); | |
2798 | if (ret != 0) { | |
2799 | WARN_ON(1); | |
2800 | goto done; | |
2801 | } | |
2802 | ||
2803 | /* | |
2804 | * we have a block from this transaction, log every item in it | |
2805 | * from our directory | |
2806 | */ | |
d397712b | 2807 | while (1) { |
e02119d5 CM |
2808 | struct btrfs_key tmp; |
2809 | src = path->nodes[0]; | |
2810 | nritems = btrfs_header_nritems(src); | |
2811 | for (i = path->slots[0]; i < nritems; i++) { | |
2812 | btrfs_item_key_to_cpu(src, &min_key, i); | |
2813 | ||
33345d01 | 2814 | if (min_key.objectid != ino || min_key.type != key_type) |
e02119d5 CM |
2815 | goto done; |
2816 | ret = overwrite_item(trans, log, dst_path, src, i, | |
2817 | &min_key); | |
4a500fd1 YZ |
2818 | if (ret) { |
2819 | err = ret; | |
2820 | goto done; | |
2821 | } | |
e02119d5 CM |
2822 | } |
2823 | path->slots[0] = nritems; | |
2824 | ||
2825 | /* | |
2826 | * look ahead to the next item and see if it is also | |
2827 | * from this directory and from this transaction | |
2828 | */ | |
2829 | ret = btrfs_next_leaf(root, path); | |
2830 | if (ret == 1) { | |
2831 | last_offset = (u64)-1; | |
2832 | goto done; | |
2833 | } | |
2834 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); | |
33345d01 | 2835 | if (tmp.objectid != ino || tmp.type != key_type) { |
e02119d5 CM |
2836 | last_offset = (u64)-1; |
2837 | goto done; | |
2838 | } | |
2839 | if (btrfs_header_generation(path->nodes[0]) != trans->transid) { | |
2840 | ret = overwrite_item(trans, log, dst_path, | |
2841 | path->nodes[0], path->slots[0], | |
2842 | &tmp); | |
4a500fd1 YZ |
2843 | if (ret) |
2844 | err = ret; | |
2845 | else | |
2846 | last_offset = tmp.offset; | |
e02119d5 CM |
2847 | goto done; |
2848 | } | |
2849 | } | |
2850 | done: | |
b3b4aa74 DS |
2851 | btrfs_release_path(path); |
2852 | btrfs_release_path(dst_path); | |
e02119d5 | 2853 | |
4a500fd1 YZ |
2854 | if (err == 0) { |
2855 | *last_offset_ret = last_offset; | |
2856 | /* | |
2857 | * insert the log range keys to indicate where the log | |
2858 | * is valid | |
2859 | */ | |
2860 | ret = insert_dir_log_key(trans, log, path, key_type, | |
33345d01 | 2861 | ino, first_offset, last_offset); |
4a500fd1 YZ |
2862 | if (ret) |
2863 | err = ret; | |
2864 | } | |
2865 | return err; | |
e02119d5 CM |
2866 | } |
2867 | ||
2868 | /* | |
2869 | * logging directories is very similar to logging inodes, We find all the items | |
2870 | * from the current transaction and write them to the log. | |
2871 | * | |
2872 | * The recovery code scans the directory in the subvolume, and if it finds a | |
2873 | * key in the range logged that is not present in the log tree, then it means | |
2874 | * that dir entry was unlinked during the transaction. | |
2875 | * | |
2876 | * In order for that scan to work, we must include one key smaller than | |
2877 | * the smallest logged by this transaction and one key larger than the largest | |
2878 | * key logged by this transaction. | |
2879 | */ | |
2880 | static noinline int log_directory_changes(struct btrfs_trans_handle *trans, | |
2881 | struct btrfs_root *root, struct inode *inode, | |
2882 | struct btrfs_path *path, | |
2883 | struct btrfs_path *dst_path) | |
2884 | { | |
2885 | u64 min_key; | |
2886 | u64 max_key; | |
2887 | int ret; | |
2888 | int key_type = BTRFS_DIR_ITEM_KEY; | |
2889 | ||
2890 | again: | |
2891 | min_key = 0; | |
2892 | max_key = 0; | |
d397712b | 2893 | while (1) { |
e02119d5 CM |
2894 | ret = log_dir_items(trans, root, inode, path, |
2895 | dst_path, key_type, min_key, | |
2896 | &max_key); | |
4a500fd1 YZ |
2897 | if (ret) |
2898 | return ret; | |
e02119d5 CM |
2899 | if (max_key == (u64)-1) |
2900 | break; | |
2901 | min_key = max_key + 1; | |
2902 | } | |
2903 | ||
2904 | if (key_type == BTRFS_DIR_ITEM_KEY) { | |
2905 | key_type = BTRFS_DIR_INDEX_KEY; | |
2906 | goto again; | |
2907 | } | |
2908 | return 0; | |
2909 | } | |
2910 | ||
2911 | /* | |
2912 | * a helper function to drop items from the log before we relog an | |
2913 | * inode. max_key_type indicates the highest item type to remove. | |
2914 | * This cannot be run for file data extents because it does not | |
2915 | * free the extents they point to. | |
2916 | */ | |
2917 | static int drop_objectid_items(struct btrfs_trans_handle *trans, | |
2918 | struct btrfs_root *log, | |
2919 | struct btrfs_path *path, | |
2920 | u64 objectid, int max_key_type) | |
2921 | { | |
2922 | int ret; | |
2923 | struct btrfs_key key; | |
2924 | struct btrfs_key found_key; | |
18ec90d6 | 2925 | int start_slot; |
e02119d5 CM |
2926 | |
2927 | key.objectid = objectid; | |
2928 | key.type = max_key_type; | |
2929 | key.offset = (u64)-1; | |
2930 | ||
d397712b | 2931 | while (1) { |
e02119d5 | 2932 | ret = btrfs_search_slot(trans, log, &key, path, -1, 1); |
4a500fd1 YZ |
2933 | BUG_ON(ret == 0); |
2934 | if (ret < 0) | |
e02119d5 CM |
2935 | break; |
2936 | ||
2937 | if (path->slots[0] == 0) | |
2938 | break; | |
2939 | ||
2940 | path->slots[0]--; | |
2941 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
2942 | path->slots[0]); | |
2943 | ||
2944 | if (found_key.objectid != objectid) | |
2945 | break; | |
2946 | ||
18ec90d6 JB |
2947 | found_key.offset = 0; |
2948 | found_key.type = 0; | |
2949 | ret = btrfs_bin_search(path->nodes[0], &found_key, 0, | |
2950 | &start_slot); | |
2951 | ||
2952 | ret = btrfs_del_items(trans, log, path, start_slot, | |
2953 | path->slots[0] - start_slot + 1); | |
2954 | /* | |
2955 | * If start slot isn't 0 then we don't need to re-search, we've | |
2956 | * found the last guy with the objectid in this tree. | |
2957 | */ | |
2958 | if (ret || start_slot != 0) | |
65a246c5 | 2959 | break; |
b3b4aa74 | 2960 | btrfs_release_path(path); |
e02119d5 | 2961 | } |
b3b4aa74 | 2962 | btrfs_release_path(path); |
5bdbeb21 JB |
2963 | if (ret > 0) |
2964 | ret = 0; | |
4a500fd1 | 2965 | return ret; |
e02119d5 CM |
2966 | } |
2967 | ||
94edf4ae JB |
2968 | static void fill_inode_item(struct btrfs_trans_handle *trans, |
2969 | struct extent_buffer *leaf, | |
2970 | struct btrfs_inode_item *item, | |
2971 | struct inode *inode, int log_inode_only) | |
2972 | { | |
0b1c6cca JB |
2973 | struct btrfs_map_token token; |
2974 | ||
2975 | btrfs_init_map_token(&token); | |
94edf4ae JB |
2976 | |
2977 | if (log_inode_only) { | |
2978 | /* set the generation to zero so the recover code | |
2979 | * can tell the difference between an logging | |
2980 | * just to say 'this inode exists' and a logging | |
2981 | * to say 'update this inode with these values' | |
2982 | */ | |
0b1c6cca JB |
2983 | btrfs_set_token_inode_generation(leaf, item, 0, &token); |
2984 | btrfs_set_token_inode_size(leaf, item, 0, &token); | |
94edf4ae | 2985 | } else { |
0b1c6cca JB |
2986 | btrfs_set_token_inode_generation(leaf, item, |
2987 | BTRFS_I(inode)->generation, | |
2988 | &token); | |
2989 | btrfs_set_token_inode_size(leaf, item, inode->i_size, &token); | |
2990 | } | |
2991 | ||
2992 | btrfs_set_token_inode_uid(leaf, item, i_uid_read(inode), &token); | |
2993 | btrfs_set_token_inode_gid(leaf, item, i_gid_read(inode), &token); | |
2994 | btrfs_set_token_inode_mode(leaf, item, inode->i_mode, &token); | |
2995 | btrfs_set_token_inode_nlink(leaf, item, inode->i_nlink, &token); | |
2996 | ||
2997 | btrfs_set_token_timespec_sec(leaf, btrfs_inode_atime(item), | |
2998 | inode->i_atime.tv_sec, &token); | |
2999 | btrfs_set_token_timespec_nsec(leaf, btrfs_inode_atime(item), | |
3000 | inode->i_atime.tv_nsec, &token); | |
3001 | ||
3002 | btrfs_set_token_timespec_sec(leaf, btrfs_inode_mtime(item), | |
3003 | inode->i_mtime.tv_sec, &token); | |
3004 | btrfs_set_token_timespec_nsec(leaf, btrfs_inode_mtime(item), | |
3005 | inode->i_mtime.tv_nsec, &token); | |
3006 | ||
3007 | btrfs_set_token_timespec_sec(leaf, btrfs_inode_ctime(item), | |
3008 | inode->i_ctime.tv_sec, &token); | |
3009 | btrfs_set_token_timespec_nsec(leaf, btrfs_inode_ctime(item), | |
3010 | inode->i_ctime.tv_nsec, &token); | |
3011 | ||
3012 | btrfs_set_token_inode_nbytes(leaf, item, inode_get_bytes(inode), | |
3013 | &token); | |
3014 | ||
3015 | btrfs_set_token_inode_sequence(leaf, item, inode->i_version, &token); | |
3016 | btrfs_set_token_inode_transid(leaf, item, trans->transid, &token); | |
3017 | btrfs_set_token_inode_rdev(leaf, item, inode->i_rdev, &token); | |
3018 | btrfs_set_token_inode_flags(leaf, item, BTRFS_I(inode)->flags, &token); | |
3019 | btrfs_set_token_inode_block_group(leaf, item, 0, &token); | |
94edf4ae JB |
3020 | } |
3021 | ||
a95249b3 JB |
3022 | static int log_inode_item(struct btrfs_trans_handle *trans, |
3023 | struct btrfs_root *log, struct btrfs_path *path, | |
3024 | struct inode *inode) | |
3025 | { | |
3026 | struct btrfs_inode_item *inode_item; | |
3027 | struct btrfs_key key; | |
3028 | int ret; | |
3029 | ||
3030 | memcpy(&key, &BTRFS_I(inode)->location, sizeof(key)); | |
3031 | ret = btrfs_insert_empty_item(trans, log, path, &key, | |
3032 | sizeof(*inode_item)); | |
3033 | if (ret && ret != -EEXIST) | |
3034 | return ret; | |
3035 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3036 | struct btrfs_inode_item); | |
3037 | fill_inode_item(trans, path->nodes[0], inode_item, inode, 0); | |
3038 | btrfs_release_path(path); | |
3039 | return 0; | |
3040 | } | |
3041 | ||
31ff1cd2 | 3042 | static noinline int copy_items(struct btrfs_trans_handle *trans, |
d2794405 | 3043 | struct inode *inode, |
31ff1cd2 CM |
3044 | struct btrfs_path *dst_path, |
3045 | struct extent_buffer *src, | |
3046 | int start_slot, int nr, int inode_only) | |
3047 | { | |
3048 | unsigned long src_offset; | |
3049 | unsigned long dst_offset; | |
d2794405 | 3050 | struct btrfs_root *log = BTRFS_I(inode)->root->log_root; |
31ff1cd2 CM |
3051 | struct btrfs_file_extent_item *extent; |
3052 | struct btrfs_inode_item *inode_item; | |
3053 | int ret; | |
3054 | struct btrfs_key *ins_keys; | |
3055 | u32 *ins_sizes; | |
3056 | char *ins_data; | |
3057 | int i; | |
d20f7043 | 3058 | struct list_head ordered_sums; |
d2794405 | 3059 | int skip_csum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
d20f7043 CM |
3060 | |
3061 | INIT_LIST_HEAD(&ordered_sums); | |
31ff1cd2 CM |
3062 | |
3063 | ins_data = kmalloc(nr * sizeof(struct btrfs_key) + | |
3064 | nr * sizeof(u32), GFP_NOFS); | |
2a29edc6 | 3065 | if (!ins_data) |
3066 | return -ENOMEM; | |
3067 | ||
31ff1cd2 CM |
3068 | ins_sizes = (u32 *)ins_data; |
3069 | ins_keys = (struct btrfs_key *)(ins_data + nr * sizeof(u32)); | |
3070 | ||
3071 | for (i = 0; i < nr; i++) { | |
3072 | ins_sizes[i] = btrfs_item_size_nr(src, i + start_slot); | |
3073 | btrfs_item_key_to_cpu(src, ins_keys + i, i + start_slot); | |
3074 | } | |
3075 | ret = btrfs_insert_empty_items(trans, log, dst_path, | |
3076 | ins_keys, ins_sizes, nr); | |
4a500fd1 YZ |
3077 | if (ret) { |
3078 | kfree(ins_data); | |
3079 | return ret; | |
3080 | } | |
31ff1cd2 | 3081 | |
5d4f98a2 | 3082 | for (i = 0; i < nr; i++, dst_path->slots[0]++) { |
31ff1cd2 CM |
3083 | dst_offset = btrfs_item_ptr_offset(dst_path->nodes[0], |
3084 | dst_path->slots[0]); | |
3085 | ||
3086 | src_offset = btrfs_item_ptr_offset(src, start_slot + i); | |
3087 | ||
94edf4ae | 3088 | if (ins_keys[i].type == BTRFS_INODE_ITEM_KEY) { |
31ff1cd2 CM |
3089 | inode_item = btrfs_item_ptr(dst_path->nodes[0], |
3090 | dst_path->slots[0], | |
3091 | struct btrfs_inode_item); | |
94edf4ae JB |
3092 | fill_inode_item(trans, dst_path->nodes[0], inode_item, |
3093 | inode, inode_only == LOG_INODE_EXISTS); | |
3094 | } else { | |
3095 | copy_extent_buffer(dst_path->nodes[0], src, dst_offset, | |
3096 | src_offset, ins_sizes[i]); | |
31ff1cd2 | 3097 | } |
94edf4ae | 3098 | |
31ff1cd2 CM |
3099 | /* take a reference on file data extents so that truncates |
3100 | * or deletes of this inode don't have to relog the inode | |
3101 | * again | |
3102 | */ | |
d2794405 LB |
3103 | if (btrfs_key_type(ins_keys + i) == BTRFS_EXTENT_DATA_KEY && |
3104 | !skip_csum) { | |
31ff1cd2 CM |
3105 | int found_type; |
3106 | extent = btrfs_item_ptr(src, start_slot + i, | |
3107 | struct btrfs_file_extent_item); | |
3108 | ||
8e531cdf | 3109 | if (btrfs_file_extent_generation(src, extent) < trans->transid) |
3110 | continue; | |
3111 | ||
31ff1cd2 | 3112 | found_type = btrfs_file_extent_type(src, extent); |
6f1fed77 | 3113 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
5d4f98a2 YZ |
3114 | u64 ds, dl, cs, cl; |
3115 | ds = btrfs_file_extent_disk_bytenr(src, | |
3116 | extent); | |
3117 | /* ds == 0 is a hole */ | |
3118 | if (ds == 0) | |
3119 | continue; | |
3120 | ||
3121 | dl = btrfs_file_extent_disk_num_bytes(src, | |
3122 | extent); | |
3123 | cs = btrfs_file_extent_offset(src, extent); | |
3124 | cl = btrfs_file_extent_num_bytes(src, | |
a419aef8 | 3125 | extent); |
580afd76 CM |
3126 | if (btrfs_file_extent_compression(src, |
3127 | extent)) { | |
3128 | cs = 0; | |
3129 | cl = dl; | |
3130 | } | |
5d4f98a2 YZ |
3131 | |
3132 | ret = btrfs_lookup_csums_range( | |
3133 | log->fs_info->csum_root, | |
3134 | ds + cs, ds + cs + cl - 1, | |
a2de733c | 3135 | &ordered_sums, 0); |
5d4f98a2 | 3136 | BUG_ON(ret); |
31ff1cd2 CM |
3137 | } |
3138 | } | |
31ff1cd2 CM |
3139 | } |
3140 | ||
3141 | btrfs_mark_buffer_dirty(dst_path->nodes[0]); | |
b3b4aa74 | 3142 | btrfs_release_path(dst_path); |
31ff1cd2 | 3143 | kfree(ins_data); |
d20f7043 CM |
3144 | |
3145 | /* | |
3146 | * we have to do this after the loop above to avoid changing the | |
3147 | * log tree while trying to change the log tree. | |
3148 | */ | |
4a500fd1 | 3149 | ret = 0; |
d397712b | 3150 | while (!list_empty(&ordered_sums)) { |
d20f7043 CM |
3151 | struct btrfs_ordered_sum *sums = list_entry(ordered_sums.next, |
3152 | struct btrfs_ordered_sum, | |
3153 | list); | |
4a500fd1 YZ |
3154 | if (!ret) |
3155 | ret = btrfs_csum_file_blocks(trans, log, sums); | |
d20f7043 CM |
3156 | list_del(&sums->list); |
3157 | kfree(sums); | |
3158 | } | |
4a500fd1 | 3159 | return ret; |
31ff1cd2 CM |
3160 | } |
3161 | ||
5dc562c5 JB |
3162 | static int extent_cmp(void *priv, struct list_head *a, struct list_head *b) |
3163 | { | |
3164 | struct extent_map *em1, *em2; | |
3165 | ||
3166 | em1 = list_entry(a, struct extent_map, list); | |
3167 | em2 = list_entry(b, struct extent_map, list); | |
3168 | ||
3169 | if (em1->start < em2->start) | |
3170 | return -1; | |
3171 | else if (em1->start > em2->start) | |
3172 | return 1; | |
3173 | return 0; | |
3174 | } | |
3175 | ||
70c8a91c JB |
3176 | static int drop_adjacent_extents(struct btrfs_trans_handle *trans, |
3177 | struct btrfs_root *root, struct inode *inode, | |
3178 | struct extent_map *em, | |
3179 | struct btrfs_path *path) | |
3180 | { | |
3181 | struct btrfs_file_extent_item *fi; | |
3182 | struct extent_buffer *leaf; | |
3183 | struct btrfs_key key, new_key; | |
3184 | struct btrfs_map_token token; | |
3185 | u64 extent_end; | |
3186 | u64 extent_offset = 0; | |
3187 | int extent_type; | |
3188 | int del_slot = 0; | |
3189 | int del_nr = 0; | |
3190 | int ret = 0; | |
3191 | ||
3192 | while (1) { | |
3193 | btrfs_init_map_token(&token); | |
3194 | leaf = path->nodes[0]; | |
3195 | path->slots[0]++; | |
3196 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
3197 | if (del_nr) { | |
3198 | ret = btrfs_del_items(trans, root, path, | |
3199 | del_slot, del_nr); | |
3200 | if (ret) | |
3201 | return ret; | |
3202 | del_nr = 0; | |
3203 | } | |
3204 | ||
3205 | ret = btrfs_next_leaf_write(trans, root, path, 1); | |
3206 | if (ret < 0) | |
3207 | return ret; | |
3208 | if (ret > 0) | |
3209 | return 0; | |
3210 | leaf = path->nodes[0]; | |
3211 | } | |
3212 | ||
3213 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
3214 | if (key.objectid != btrfs_ino(inode) || | |
3215 | key.type != BTRFS_EXTENT_DATA_KEY || | |
3216 | key.offset >= em->start + em->len) | |
3217 | break; | |
3218 | ||
3219 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
3220 | struct btrfs_file_extent_item); | |
3221 | extent_type = btrfs_token_file_extent_type(leaf, fi, &token); | |
3222 | if (extent_type == BTRFS_FILE_EXTENT_REG || | |
3223 | extent_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
3224 | extent_offset = btrfs_token_file_extent_offset(leaf, | |
3225 | fi, &token); | |
3226 | extent_end = key.offset + | |
3227 | btrfs_token_file_extent_num_bytes(leaf, fi, | |
3228 | &token); | |
3229 | } else if (extent_type == BTRFS_FILE_EXTENT_INLINE) { | |
3230 | extent_end = key.offset + | |
3231 | btrfs_file_extent_inline_len(leaf, fi); | |
3232 | } else { | |
3233 | BUG(); | |
3234 | } | |
3235 | ||
3236 | if (extent_end <= em->len + em->start) { | |
3237 | if (!del_nr) { | |
3238 | del_slot = path->slots[0]; | |
3239 | } | |
3240 | del_nr++; | |
3241 | continue; | |
3242 | } | |
3243 | ||
3244 | /* | |
3245 | * Ok so we'll ignore previous items if we log a new extent, | |
3246 | * which can lead to overlapping extents, so if we have an | |
3247 | * existing extent we want to adjust we _have_ to check the next | |
3248 | * guy to make sure we even need this extent anymore, this keeps | |
3249 | * us from panicing in set_item_key_safe. | |
3250 | */ | |
3251 | if (path->slots[0] < btrfs_header_nritems(leaf) - 1) { | |
3252 | struct btrfs_key tmp_key; | |
3253 | ||
3254 | btrfs_item_key_to_cpu(leaf, &tmp_key, | |
3255 | path->slots[0] + 1); | |
3256 | if (tmp_key.objectid == btrfs_ino(inode) && | |
3257 | tmp_key.type == BTRFS_EXTENT_DATA_KEY && | |
3258 | tmp_key.offset <= em->start + em->len) { | |
3259 | if (!del_nr) | |
3260 | del_slot = path->slots[0]; | |
3261 | del_nr++; | |
3262 | continue; | |
3263 | } | |
3264 | } | |
3265 | ||
3266 | BUG_ON(extent_type == BTRFS_FILE_EXTENT_INLINE); | |
3267 | memcpy(&new_key, &key, sizeof(new_key)); | |
3268 | new_key.offset = em->start + em->len; | |
3269 | btrfs_set_item_key_safe(trans, root, path, &new_key); | |
3270 | extent_offset += em->start + em->len - key.offset; | |
3271 | btrfs_set_token_file_extent_offset(leaf, fi, extent_offset, | |
3272 | &token); | |
3273 | btrfs_set_token_file_extent_num_bytes(leaf, fi, extent_end - | |
3274 | (em->start + em->len), | |
3275 | &token); | |
3276 | btrfs_mark_buffer_dirty(leaf); | |
3277 | } | |
3278 | ||
3279 | if (del_nr) | |
3280 | ret = btrfs_del_items(trans, root, path, del_slot, del_nr); | |
3281 | ||
3282 | return ret; | |
3283 | } | |
5dc562c5 JB |
3284 | |
3285 | static int log_one_extent(struct btrfs_trans_handle *trans, | |
3286 | struct inode *inode, struct btrfs_root *root, | |
70c8a91c | 3287 | struct extent_map *em, struct btrfs_path *path) |
5dc562c5 JB |
3288 | { |
3289 | struct btrfs_root *log = root->log_root; | |
70c8a91c JB |
3290 | struct btrfs_file_extent_item *fi; |
3291 | struct extent_buffer *leaf; | |
2ab28f32 | 3292 | struct btrfs_ordered_extent *ordered; |
70c8a91c | 3293 | struct list_head ordered_sums; |
0b1c6cca | 3294 | struct btrfs_map_token token; |
5dc562c5 | 3295 | struct btrfs_key key; |
2ab28f32 JB |
3296 | u64 mod_start = em->mod_start; |
3297 | u64 mod_len = em->mod_len; | |
3298 | u64 csum_offset; | |
3299 | u64 csum_len; | |
70c8a91c JB |
3300 | u64 extent_offset = em->start - em->orig_start; |
3301 | u64 block_len; | |
5dc562c5 | 3302 | int ret; |
2ab28f32 | 3303 | int index = log->log_transid % 2; |
70c8a91c | 3304 | bool skip_csum = BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM; |
5dc562c5 | 3305 | |
124fe663 | 3306 | insert: |
70c8a91c | 3307 | INIT_LIST_HEAD(&ordered_sums); |
0b1c6cca | 3308 | btrfs_init_map_token(&token); |
70c8a91c JB |
3309 | key.objectid = btrfs_ino(inode); |
3310 | key.type = BTRFS_EXTENT_DATA_KEY; | |
3311 | key.offset = em->start; | |
3312 | path->really_keep_locks = 1; | |
3313 | ||
3314 | ret = btrfs_insert_empty_item(trans, log, path, &key, sizeof(*fi)); | |
3315 | if (ret && ret != -EEXIST) { | |
3316 | path->really_keep_locks = 0; | |
3317 | return ret; | |
3318 | } | |
3319 | leaf = path->nodes[0]; | |
3320 | fi = btrfs_item_ptr(leaf, path->slots[0], | |
3321 | struct btrfs_file_extent_item); | |
124fe663 JB |
3322 | |
3323 | /* | |
3324 | * If we are overwriting an inline extent with a real one then we need | |
3325 | * to just delete the inline extent as it may not be large enough to | |
3326 | * have the entire file_extent_item. | |
3327 | */ | |
3328 | if (ret && btrfs_token_file_extent_type(leaf, fi, &token) == | |
3329 | BTRFS_FILE_EXTENT_INLINE) { | |
3330 | ret = btrfs_del_item(trans, log, path); | |
3331 | btrfs_release_path(path); | |
3332 | if (ret) { | |
3333 | path->really_keep_locks = 0; | |
3334 | return ret; | |
3335 | } | |
3336 | goto insert; | |
3337 | } | |
3338 | ||
0b1c6cca JB |
3339 | btrfs_set_token_file_extent_generation(leaf, fi, em->generation, |
3340 | &token); | |
70c8a91c JB |
3341 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) { |
3342 | skip_csum = true; | |
0b1c6cca JB |
3343 | btrfs_set_token_file_extent_type(leaf, fi, |
3344 | BTRFS_FILE_EXTENT_PREALLOC, | |
3345 | &token); | |
70c8a91c | 3346 | } else { |
0b1c6cca JB |
3347 | btrfs_set_token_file_extent_type(leaf, fi, |
3348 | BTRFS_FILE_EXTENT_REG, | |
3349 | &token); | |
70c8a91c JB |
3350 | if (em->block_start == 0) |
3351 | skip_csum = true; | |
3352 | } | |
3353 | ||
3354 | block_len = max(em->block_len, em->orig_block_len); | |
3355 | if (em->compress_type != BTRFS_COMPRESS_NONE) { | |
0b1c6cca JB |
3356 | btrfs_set_token_file_extent_disk_bytenr(leaf, fi, |
3357 | em->block_start, | |
3358 | &token); | |
3359 | btrfs_set_token_file_extent_disk_num_bytes(leaf, fi, block_len, | |
3360 | &token); | |
70c8a91c | 3361 | } else if (em->block_start < EXTENT_MAP_LAST_BYTE) { |
0b1c6cca JB |
3362 | btrfs_set_token_file_extent_disk_bytenr(leaf, fi, |
3363 | em->block_start - | |
3364 | extent_offset, &token); | |
3365 | btrfs_set_token_file_extent_disk_num_bytes(leaf, fi, block_len, | |
3366 | &token); | |
70c8a91c | 3367 | } else { |
0b1c6cca JB |
3368 | btrfs_set_token_file_extent_disk_bytenr(leaf, fi, 0, &token); |
3369 | btrfs_set_token_file_extent_disk_num_bytes(leaf, fi, 0, | |
3370 | &token); | |
3371 | } | |
3372 | ||
3373 | btrfs_set_token_file_extent_offset(leaf, fi, | |
3374 | em->start - em->orig_start, | |
3375 | &token); | |
3376 | btrfs_set_token_file_extent_num_bytes(leaf, fi, em->len, &token); | |
3377 | btrfs_set_token_file_extent_ram_bytes(leaf, fi, em->len, &token); | |
3378 | btrfs_set_token_file_extent_compression(leaf, fi, em->compress_type, | |
3379 | &token); | |
3380 | btrfs_set_token_file_extent_encryption(leaf, fi, 0, &token); | |
3381 | btrfs_set_token_file_extent_other_encoding(leaf, fi, 0, &token); | |
70c8a91c | 3382 | btrfs_mark_buffer_dirty(leaf); |
0aa4a17d | 3383 | |
70c8a91c JB |
3384 | /* |
3385 | * Have to check the extent to the right of us to make sure it doesn't | |
3386 | * fall in our current range. We're ok if the previous extent is in our | |
3387 | * range since the recovery stuff will run us in key order and thus just | |
3388 | * drop the part we overwrote. | |
3389 | */ | |
3390 | ret = drop_adjacent_extents(trans, log, inode, em, path); | |
3391 | btrfs_release_path(path); | |
3392 | path->really_keep_locks = 0; | |
3393 | if (ret) { | |
3394 | return ret; | |
3395 | } | |
0aa4a17d | 3396 | |
70c8a91c JB |
3397 | if (skip_csum) |
3398 | return 0; | |
5dc562c5 | 3399 | |
192000dd LB |
3400 | if (em->compress_type) { |
3401 | csum_offset = 0; | |
3402 | csum_len = block_len; | |
3403 | } | |
3404 | ||
2ab28f32 JB |
3405 | /* |
3406 | * First check and see if our csums are on our outstanding ordered | |
3407 | * extents. | |
3408 | */ | |
3409 | again: | |
3410 | spin_lock_irq(&log->log_extents_lock[index]); | |
3411 | list_for_each_entry(ordered, &log->logged_list[index], log_list) { | |
3412 | struct btrfs_ordered_sum *sum; | |
3413 | ||
3414 | if (!mod_len) | |
3415 | break; | |
3416 | ||
3417 | if (ordered->inode != inode) | |
3418 | continue; | |
3419 | ||
3420 | if (ordered->file_offset + ordered->len <= mod_start || | |
3421 | mod_start + mod_len <= ordered->file_offset) | |
3422 | continue; | |
3423 | ||
3424 | /* | |
3425 | * We are going to copy all the csums on this ordered extent, so | |
3426 | * go ahead and adjust mod_start and mod_len in case this | |
3427 | * ordered extent has already been logged. | |
3428 | */ | |
3429 | if (ordered->file_offset > mod_start) { | |
3430 | if (ordered->file_offset + ordered->len >= | |
3431 | mod_start + mod_len) | |
3432 | mod_len = ordered->file_offset - mod_start; | |
3433 | /* | |
3434 | * If we have this case | |
3435 | * | |
3436 | * |--------- logged extent ---------| | |
3437 | * |----- ordered extent ----| | |
3438 | * | |
3439 | * Just don't mess with mod_start and mod_len, we'll | |
3440 | * just end up logging more csums than we need and it | |
3441 | * will be ok. | |
3442 | */ | |
3443 | } else { | |
3444 | if (ordered->file_offset + ordered->len < | |
3445 | mod_start + mod_len) { | |
3446 | mod_len = (mod_start + mod_len) - | |
3447 | (ordered->file_offset + ordered->len); | |
3448 | mod_start = ordered->file_offset + | |
3449 | ordered->len; | |
3450 | } else { | |
3451 | mod_len = 0; | |
3452 | } | |
3453 | } | |
3454 | ||
3455 | /* | |
3456 | * To keep us from looping for the above case of an ordered | |
3457 | * extent that falls inside of the logged extent. | |
3458 | */ | |
3459 | if (test_and_set_bit(BTRFS_ORDERED_LOGGED_CSUM, | |
3460 | &ordered->flags)) | |
3461 | continue; | |
3462 | atomic_inc(&ordered->refs); | |
3463 | spin_unlock_irq(&log->log_extents_lock[index]); | |
3464 | /* | |
3465 | * we've dropped the lock, we must either break or | |
3466 | * start over after this. | |
3467 | */ | |
3468 | ||
3469 | wait_event(ordered->wait, ordered->csum_bytes_left == 0); | |
3470 | ||
3471 | list_for_each_entry(sum, &ordered->list, list) { | |
3472 | ret = btrfs_csum_file_blocks(trans, log, sum); | |
3473 | if (ret) { | |
3474 | btrfs_put_ordered_extent(ordered); | |
3475 | goto unlocked; | |
3476 | } | |
3477 | } | |
3478 | btrfs_put_ordered_extent(ordered); | |
3479 | goto again; | |
3480 | ||
3481 | } | |
3482 | spin_unlock_irq(&log->log_extents_lock[index]); | |
3483 | unlocked: | |
3484 | ||
3485 | if (!mod_len || ret) | |
3486 | return ret; | |
3487 | ||
3488 | csum_offset = mod_start - em->start; | |
3489 | csum_len = mod_len; | |
3490 | ||
70c8a91c JB |
3491 | /* block start is already adjusted for the file extent offset. */ |
3492 | ret = btrfs_lookup_csums_range(log->fs_info->csum_root, | |
3493 | em->block_start + csum_offset, | |
3494 | em->block_start + csum_offset + | |
3495 | csum_len - 1, &ordered_sums, 0); | |
3496 | if (ret) | |
3497 | return ret; | |
5dc562c5 | 3498 | |
70c8a91c JB |
3499 | while (!list_empty(&ordered_sums)) { |
3500 | struct btrfs_ordered_sum *sums = list_entry(ordered_sums.next, | |
3501 | struct btrfs_ordered_sum, | |
3502 | list); | |
3503 | if (!ret) | |
3504 | ret = btrfs_csum_file_blocks(trans, log, sums); | |
3505 | list_del(&sums->list); | |
3506 | kfree(sums); | |
5dc562c5 JB |
3507 | } |
3508 | ||
70c8a91c | 3509 | return ret; |
5dc562c5 JB |
3510 | } |
3511 | ||
3512 | static int btrfs_log_changed_extents(struct btrfs_trans_handle *trans, | |
3513 | struct btrfs_root *root, | |
3514 | struct inode *inode, | |
70c8a91c | 3515 | struct btrfs_path *path) |
5dc562c5 | 3516 | { |
5dc562c5 JB |
3517 | struct extent_map *em, *n; |
3518 | struct list_head extents; | |
3519 | struct extent_map_tree *tree = &BTRFS_I(inode)->extent_tree; | |
3520 | u64 test_gen; | |
3521 | int ret = 0; | |
2ab28f32 | 3522 | int num = 0; |
5dc562c5 JB |
3523 | |
3524 | INIT_LIST_HEAD(&extents); | |
3525 | ||
5dc562c5 JB |
3526 | write_lock(&tree->lock); |
3527 | test_gen = root->fs_info->last_trans_committed; | |
3528 | ||
3529 | list_for_each_entry_safe(em, n, &tree->modified_extents, list) { | |
3530 | list_del_init(&em->list); | |
2ab28f32 JB |
3531 | |
3532 | /* | |
3533 | * Just an arbitrary number, this can be really CPU intensive | |
3534 | * once we start getting a lot of extents, and really once we | |
3535 | * have a bunch of extents we just want to commit since it will | |
3536 | * be faster. | |
3537 | */ | |
3538 | if (++num > 32768) { | |
3539 | list_del_init(&tree->modified_extents); | |
3540 | ret = -EFBIG; | |
3541 | goto process; | |
3542 | } | |
3543 | ||
5dc562c5 JB |
3544 | if (em->generation <= test_gen) |
3545 | continue; | |
ff44c6e3 JB |
3546 | /* Need a ref to keep it from getting evicted from cache */ |
3547 | atomic_inc(&em->refs); | |
3548 | set_bit(EXTENT_FLAG_LOGGING, &em->flags); | |
5dc562c5 | 3549 | list_add_tail(&em->list, &extents); |
2ab28f32 | 3550 | num++; |
5dc562c5 JB |
3551 | } |
3552 | ||
3553 | list_sort(NULL, &extents, extent_cmp); | |
3554 | ||
2ab28f32 | 3555 | process: |
5dc562c5 JB |
3556 | while (!list_empty(&extents)) { |
3557 | em = list_entry(extents.next, struct extent_map, list); | |
3558 | ||
3559 | list_del_init(&em->list); | |
3560 | ||
3561 | /* | |
3562 | * If we had an error we just need to delete everybody from our | |
3563 | * private list. | |
3564 | */ | |
ff44c6e3 | 3565 | if (ret) { |
201a9038 | 3566 | clear_em_logging(tree, em); |
ff44c6e3 | 3567 | free_extent_map(em); |
5dc562c5 | 3568 | continue; |
ff44c6e3 JB |
3569 | } |
3570 | ||
3571 | write_unlock(&tree->lock); | |
5dc562c5 | 3572 | |
70c8a91c | 3573 | ret = log_one_extent(trans, inode, root, em, path); |
ff44c6e3 | 3574 | write_lock(&tree->lock); |
201a9038 JB |
3575 | clear_em_logging(tree, em); |
3576 | free_extent_map(em); | |
5dc562c5 | 3577 | } |
ff44c6e3 JB |
3578 | WARN_ON(!list_empty(&extents)); |
3579 | write_unlock(&tree->lock); | |
5dc562c5 | 3580 | |
5dc562c5 | 3581 | btrfs_release_path(path); |
5dc562c5 JB |
3582 | return ret; |
3583 | } | |
3584 | ||
e02119d5 CM |
3585 | /* log a single inode in the tree log. |
3586 | * At least one parent directory for this inode must exist in the tree | |
3587 | * or be logged already. | |
3588 | * | |
3589 | * Any items from this inode changed by the current transaction are copied | |
3590 | * to the log tree. An extra reference is taken on any extents in this | |
3591 | * file, allowing us to avoid a whole pile of corner cases around logging | |
3592 | * blocks that have been removed from the tree. | |
3593 | * | |
3594 | * See LOG_INODE_ALL and related defines for a description of what inode_only | |
3595 | * does. | |
3596 | * | |
3597 | * This handles both files and directories. | |
3598 | */ | |
12fcfd22 | 3599 | static int btrfs_log_inode(struct btrfs_trans_handle *trans, |
e02119d5 CM |
3600 | struct btrfs_root *root, struct inode *inode, |
3601 | int inode_only) | |
3602 | { | |
3603 | struct btrfs_path *path; | |
3604 | struct btrfs_path *dst_path; | |
3605 | struct btrfs_key min_key; | |
3606 | struct btrfs_key max_key; | |
3607 | struct btrfs_root *log = root->log_root; | |
31ff1cd2 | 3608 | struct extent_buffer *src = NULL; |
4a500fd1 | 3609 | int err = 0; |
e02119d5 | 3610 | int ret; |
3a5f1d45 | 3611 | int nritems; |
31ff1cd2 CM |
3612 | int ins_start_slot = 0; |
3613 | int ins_nr; | |
5dc562c5 | 3614 | bool fast_search = false; |
33345d01 | 3615 | u64 ino = btrfs_ino(inode); |
e02119d5 CM |
3616 | |
3617 | log = root->log_root; | |
3618 | ||
3619 | path = btrfs_alloc_path(); | |
5df67083 TI |
3620 | if (!path) |
3621 | return -ENOMEM; | |
e02119d5 | 3622 | dst_path = btrfs_alloc_path(); |
5df67083 TI |
3623 | if (!dst_path) { |
3624 | btrfs_free_path(path); | |
3625 | return -ENOMEM; | |
3626 | } | |
e02119d5 | 3627 | |
33345d01 | 3628 | min_key.objectid = ino; |
e02119d5 CM |
3629 | min_key.type = BTRFS_INODE_ITEM_KEY; |
3630 | min_key.offset = 0; | |
3631 | ||
33345d01 | 3632 | max_key.objectid = ino; |
12fcfd22 | 3633 | |
12fcfd22 | 3634 | |
5dc562c5 | 3635 | /* today the code can only do partial logging of directories */ |
5269b67e MX |
3636 | if (S_ISDIR(inode->i_mode) || |
3637 | (!test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
3638 | &BTRFS_I(inode)->runtime_flags) && | |
3639 | inode_only == LOG_INODE_EXISTS)) | |
e02119d5 CM |
3640 | max_key.type = BTRFS_XATTR_ITEM_KEY; |
3641 | else | |
3642 | max_key.type = (u8)-1; | |
3643 | max_key.offset = (u64)-1; | |
3644 | ||
94edf4ae JB |
3645 | /* Only run delayed items if we are a dir or a new file */ |
3646 | if (S_ISDIR(inode->i_mode) || | |
3647 | BTRFS_I(inode)->generation > root->fs_info->last_trans_committed) { | |
3648 | ret = btrfs_commit_inode_delayed_items(trans, inode); | |
3649 | if (ret) { | |
3650 | btrfs_free_path(path); | |
3651 | btrfs_free_path(dst_path); | |
3652 | return ret; | |
3653 | } | |
16cdcec7 MX |
3654 | } |
3655 | ||
e02119d5 CM |
3656 | mutex_lock(&BTRFS_I(inode)->log_mutex); |
3657 | ||
2ab28f32 JB |
3658 | btrfs_get_logged_extents(log, inode); |
3659 | ||
e02119d5 CM |
3660 | /* |
3661 | * a brute force approach to making sure we get the most uptodate | |
3662 | * copies of everything. | |
3663 | */ | |
3664 | if (S_ISDIR(inode->i_mode)) { | |
3665 | int max_key_type = BTRFS_DIR_LOG_INDEX_KEY; | |
3666 | ||
3667 | if (inode_only == LOG_INODE_EXISTS) | |
3668 | max_key_type = BTRFS_XATTR_ITEM_KEY; | |
33345d01 | 3669 | ret = drop_objectid_items(trans, log, path, ino, max_key_type); |
e02119d5 | 3670 | } else { |
5dc562c5 JB |
3671 | if (test_and_clear_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
3672 | &BTRFS_I(inode)->runtime_flags)) { | |
e9976151 JB |
3673 | clear_bit(BTRFS_INODE_COPY_EVERYTHING, |
3674 | &BTRFS_I(inode)->runtime_flags); | |
5dc562c5 JB |
3675 | ret = btrfs_truncate_inode_items(trans, log, |
3676 | inode, 0, 0); | |
a95249b3 JB |
3677 | } else if (test_and_clear_bit(BTRFS_INODE_COPY_EVERYTHING, |
3678 | &BTRFS_I(inode)->runtime_flags)) { | |
183f37fa LB |
3679 | if (inode_only == LOG_INODE_ALL) |
3680 | fast_search = true; | |
a95249b3 | 3681 | max_key.type = BTRFS_XATTR_ITEM_KEY; |
5dc562c5 | 3682 | ret = drop_objectid_items(trans, log, path, ino, |
e9976151 | 3683 | max_key.type); |
a95249b3 JB |
3684 | } else { |
3685 | if (inode_only == LOG_INODE_ALL) | |
3686 | fast_search = true; | |
3687 | ret = log_inode_item(trans, log, dst_path, inode); | |
3688 | if (ret) { | |
3689 | err = ret; | |
3690 | goto out_unlock; | |
3691 | } | |
3692 | goto log_extents; | |
5dc562c5 | 3693 | } |
a95249b3 | 3694 | |
e02119d5 | 3695 | } |
4a500fd1 YZ |
3696 | if (ret) { |
3697 | err = ret; | |
3698 | goto out_unlock; | |
3699 | } | |
e02119d5 CM |
3700 | path->keep_locks = 1; |
3701 | ||
d397712b | 3702 | while (1) { |
31ff1cd2 | 3703 | ins_nr = 0; |
e02119d5 | 3704 | ret = btrfs_search_forward(root, &min_key, &max_key, |
de78b51a | 3705 | path, trans->transid); |
e02119d5 CM |
3706 | if (ret != 0) |
3707 | break; | |
3a5f1d45 | 3708 | again: |
31ff1cd2 | 3709 | /* note, ins_nr might be > 0 here, cleanup outside the loop */ |
33345d01 | 3710 | if (min_key.objectid != ino) |
e02119d5 CM |
3711 | break; |
3712 | if (min_key.type > max_key.type) | |
3713 | break; | |
31ff1cd2 | 3714 | |
e02119d5 | 3715 | src = path->nodes[0]; |
31ff1cd2 CM |
3716 | if (ins_nr && ins_start_slot + ins_nr == path->slots[0]) { |
3717 | ins_nr++; | |
3718 | goto next_slot; | |
3719 | } else if (!ins_nr) { | |
3720 | ins_start_slot = path->slots[0]; | |
3721 | ins_nr = 1; | |
3722 | goto next_slot; | |
e02119d5 CM |
3723 | } |
3724 | ||
d2794405 | 3725 | ret = copy_items(trans, inode, dst_path, src, ins_start_slot, |
31ff1cd2 | 3726 | ins_nr, inode_only); |
4a500fd1 YZ |
3727 | if (ret) { |
3728 | err = ret; | |
3729 | goto out_unlock; | |
3730 | } | |
31ff1cd2 CM |
3731 | ins_nr = 1; |
3732 | ins_start_slot = path->slots[0]; | |
3733 | next_slot: | |
e02119d5 | 3734 | |
3a5f1d45 CM |
3735 | nritems = btrfs_header_nritems(path->nodes[0]); |
3736 | path->slots[0]++; | |
3737 | if (path->slots[0] < nritems) { | |
3738 | btrfs_item_key_to_cpu(path->nodes[0], &min_key, | |
3739 | path->slots[0]); | |
3740 | goto again; | |
3741 | } | |
31ff1cd2 | 3742 | if (ins_nr) { |
d2794405 | 3743 | ret = copy_items(trans, inode, dst_path, src, |
31ff1cd2 CM |
3744 | ins_start_slot, |
3745 | ins_nr, inode_only); | |
4a500fd1 YZ |
3746 | if (ret) { |
3747 | err = ret; | |
3748 | goto out_unlock; | |
3749 | } | |
31ff1cd2 CM |
3750 | ins_nr = 0; |
3751 | } | |
b3b4aa74 | 3752 | btrfs_release_path(path); |
3a5f1d45 | 3753 | |
e02119d5 CM |
3754 | if (min_key.offset < (u64)-1) |
3755 | min_key.offset++; | |
3756 | else if (min_key.type < (u8)-1) | |
3757 | min_key.type++; | |
3758 | else if (min_key.objectid < (u64)-1) | |
3759 | min_key.objectid++; | |
3760 | else | |
3761 | break; | |
3762 | } | |
31ff1cd2 | 3763 | if (ins_nr) { |
d2794405 | 3764 | ret = copy_items(trans, inode, dst_path, src, ins_start_slot, |
31ff1cd2 | 3765 | ins_nr, inode_only); |
4a500fd1 YZ |
3766 | if (ret) { |
3767 | err = ret; | |
3768 | goto out_unlock; | |
3769 | } | |
31ff1cd2 CM |
3770 | ins_nr = 0; |
3771 | } | |
5dc562c5 | 3772 | |
a95249b3 | 3773 | log_extents: |
5dc562c5 | 3774 | if (fast_search) { |
5dc562c5 | 3775 | btrfs_release_path(dst_path); |
70c8a91c | 3776 | ret = btrfs_log_changed_extents(trans, root, inode, dst_path); |
5dc562c5 JB |
3777 | if (ret) { |
3778 | err = ret; | |
3779 | goto out_unlock; | |
3780 | } | |
06d3d22b LB |
3781 | } else { |
3782 | struct extent_map_tree *tree = &BTRFS_I(inode)->extent_tree; | |
3783 | struct extent_map *em, *n; | |
3784 | ||
bbe14267 | 3785 | write_lock(&tree->lock); |
06d3d22b LB |
3786 | list_for_each_entry_safe(em, n, &tree->modified_extents, list) |
3787 | list_del_init(&em->list); | |
bbe14267 | 3788 | write_unlock(&tree->lock); |
5dc562c5 JB |
3789 | } |
3790 | ||
9623f9a3 | 3791 | if (inode_only == LOG_INODE_ALL && S_ISDIR(inode->i_mode)) { |
b3b4aa74 DS |
3792 | btrfs_release_path(path); |
3793 | btrfs_release_path(dst_path); | |
e02119d5 | 3794 | ret = log_directory_changes(trans, root, inode, path, dst_path); |
4a500fd1 YZ |
3795 | if (ret) { |
3796 | err = ret; | |
3797 | goto out_unlock; | |
3798 | } | |
e02119d5 | 3799 | } |
3a5f1d45 | 3800 | BTRFS_I(inode)->logged_trans = trans->transid; |
46d8bc34 | 3801 | BTRFS_I(inode)->last_log_commit = BTRFS_I(inode)->last_sub_trans; |
4a500fd1 | 3802 | out_unlock: |
2ab28f32 JB |
3803 | if (err) |
3804 | btrfs_free_logged_extents(log, log->log_transid); | |
e02119d5 CM |
3805 | mutex_unlock(&BTRFS_I(inode)->log_mutex); |
3806 | ||
3807 | btrfs_free_path(path); | |
3808 | btrfs_free_path(dst_path); | |
4a500fd1 | 3809 | return err; |
e02119d5 CM |
3810 | } |
3811 | ||
12fcfd22 CM |
3812 | /* |
3813 | * follow the dentry parent pointers up the chain and see if any | |
3814 | * of the directories in it require a full commit before they can | |
3815 | * be logged. Returns zero if nothing special needs to be done or 1 if | |
3816 | * a full commit is required. | |
3817 | */ | |
3818 | static noinline int check_parent_dirs_for_sync(struct btrfs_trans_handle *trans, | |
3819 | struct inode *inode, | |
3820 | struct dentry *parent, | |
3821 | struct super_block *sb, | |
3822 | u64 last_committed) | |
e02119d5 | 3823 | { |
12fcfd22 CM |
3824 | int ret = 0; |
3825 | struct btrfs_root *root; | |
6a912213 | 3826 | struct dentry *old_parent = NULL; |
e02119d5 | 3827 | |
af4176b4 CM |
3828 | /* |
3829 | * for regular files, if its inode is already on disk, we don't | |
3830 | * have to worry about the parents at all. This is because | |
3831 | * we can use the last_unlink_trans field to record renames | |
3832 | * and other fun in this file. | |
3833 | */ | |
3834 | if (S_ISREG(inode->i_mode) && | |
3835 | BTRFS_I(inode)->generation <= last_committed && | |
3836 | BTRFS_I(inode)->last_unlink_trans <= last_committed) | |
3837 | goto out; | |
3838 | ||
12fcfd22 CM |
3839 | if (!S_ISDIR(inode->i_mode)) { |
3840 | if (!parent || !parent->d_inode || sb != parent->d_inode->i_sb) | |
3841 | goto out; | |
3842 | inode = parent->d_inode; | |
3843 | } | |
3844 | ||
3845 | while (1) { | |
3846 | BTRFS_I(inode)->logged_trans = trans->transid; | |
3847 | smp_mb(); | |
3848 | ||
3849 | if (BTRFS_I(inode)->last_unlink_trans > last_committed) { | |
3850 | root = BTRFS_I(inode)->root; | |
3851 | ||
3852 | /* | |
3853 | * make sure any commits to the log are forced | |
3854 | * to be full commits | |
3855 | */ | |
3856 | root->fs_info->last_trans_log_full_commit = | |
3857 | trans->transid; | |
3858 | ret = 1; | |
3859 | break; | |
3860 | } | |
3861 | ||
3862 | if (!parent || !parent->d_inode || sb != parent->d_inode->i_sb) | |
3863 | break; | |
3864 | ||
76dda93c | 3865 | if (IS_ROOT(parent)) |
12fcfd22 CM |
3866 | break; |
3867 | ||
6a912213 JB |
3868 | parent = dget_parent(parent); |
3869 | dput(old_parent); | |
3870 | old_parent = parent; | |
12fcfd22 CM |
3871 | inode = parent->d_inode; |
3872 | ||
3873 | } | |
6a912213 | 3874 | dput(old_parent); |
12fcfd22 | 3875 | out: |
e02119d5 CM |
3876 | return ret; |
3877 | } | |
3878 | ||
3879 | /* | |
3880 | * helper function around btrfs_log_inode to make sure newly created | |
3881 | * parent directories also end up in the log. A minimal inode and backref | |
3882 | * only logging is done of any parent directories that are older than | |
3883 | * the last committed transaction | |
3884 | */ | |
12fcfd22 CM |
3885 | int btrfs_log_inode_parent(struct btrfs_trans_handle *trans, |
3886 | struct btrfs_root *root, struct inode *inode, | |
3887 | struct dentry *parent, int exists_only) | |
e02119d5 | 3888 | { |
12fcfd22 | 3889 | int inode_only = exists_only ? LOG_INODE_EXISTS : LOG_INODE_ALL; |
e02119d5 | 3890 | struct super_block *sb; |
6a912213 | 3891 | struct dentry *old_parent = NULL; |
12fcfd22 CM |
3892 | int ret = 0; |
3893 | u64 last_committed = root->fs_info->last_trans_committed; | |
3894 | ||
3895 | sb = inode->i_sb; | |
3896 | ||
3a5e1404 SW |
3897 | if (btrfs_test_opt(root, NOTREELOG)) { |
3898 | ret = 1; | |
3899 | goto end_no_trans; | |
3900 | } | |
3901 | ||
12fcfd22 CM |
3902 | if (root->fs_info->last_trans_log_full_commit > |
3903 | root->fs_info->last_trans_committed) { | |
3904 | ret = 1; | |
3905 | goto end_no_trans; | |
3906 | } | |
3907 | ||
76dda93c YZ |
3908 | if (root != BTRFS_I(inode)->root || |
3909 | btrfs_root_refs(&root->root_item) == 0) { | |
3910 | ret = 1; | |
3911 | goto end_no_trans; | |
3912 | } | |
3913 | ||
12fcfd22 CM |
3914 | ret = check_parent_dirs_for_sync(trans, inode, parent, |
3915 | sb, last_committed); | |
3916 | if (ret) | |
3917 | goto end_no_trans; | |
e02119d5 | 3918 | |
22ee6985 | 3919 | if (btrfs_inode_in_log(inode, trans->transid)) { |
257c62e1 CM |
3920 | ret = BTRFS_NO_LOG_SYNC; |
3921 | goto end_no_trans; | |
3922 | } | |
3923 | ||
4a500fd1 YZ |
3924 | ret = start_log_trans(trans, root); |
3925 | if (ret) | |
3926 | goto end_trans; | |
e02119d5 | 3927 | |
12fcfd22 | 3928 | ret = btrfs_log_inode(trans, root, inode, inode_only); |
4a500fd1 YZ |
3929 | if (ret) |
3930 | goto end_trans; | |
12fcfd22 | 3931 | |
af4176b4 CM |
3932 | /* |
3933 | * for regular files, if its inode is already on disk, we don't | |
3934 | * have to worry about the parents at all. This is because | |
3935 | * we can use the last_unlink_trans field to record renames | |
3936 | * and other fun in this file. | |
3937 | */ | |
3938 | if (S_ISREG(inode->i_mode) && | |
3939 | BTRFS_I(inode)->generation <= last_committed && | |
4a500fd1 YZ |
3940 | BTRFS_I(inode)->last_unlink_trans <= last_committed) { |
3941 | ret = 0; | |
3942 | goto end_trans; | |
3943 | } | |
af4176b4 CM |
3944 | |
3945 | inode_only = LOG_INODE_EXISTS; | |
12fcfd22 CM |
3946 | while (1) { |
3947 | if (!parent || !parent->d_inode || sb != parent->d_inode->i_sb) | |
e02119d5 CM |
3948 | break; |
3949 | ||
12fcfd22 | 3950 | inode = parent->d_inode; |
76dda93c YZ |
3951 | if (root != BTRFS_I(inode)->root) |
3952 | break; | |
3953 | ||
12fcfd22 CM |
3954 | if (BTRFS_I(inode)->generation > |
3955 | root->fs_info->last_trans_committed) { | |
3956 | ret = btrfs_log_inode(trans, root, inode, inode_only); | |
4a500fd1 YZ |
3957 | if (ret) |
3958 | goto end_trans; | |
12fcfd22 | 3959 | } |
76dda93c | 3960 | if (IS_ROOT(parent)) |
e02119d5 | 3961 | break; |
12fcfd22 | 3962 | |
6a912213 JB |
3963 | parent = dget_parent(parent); |
3964 | dput(old_parent); | |
3965 | old_parent = parent; | |
e02119d5 | 3966 | } |
12fcfd22 | 3967 | ret = 0; |
4a500fd1 | 3968 | end_trans: |
6a912213 | 3969 | dput(old_parent); |
4a500fd1 | 3970 | if (ret < 0) { |
4a500fd1 YZ |
3971 | root->fs_info->last_trans_log_full_commit = trans->transid; |
3972 | ret = 1; | |
3973 | } | |
12fcfd22 CM |
3974 | btrfs_end_log_trans(root); |
3975 | end_no_trans: | |
3976 | return ret; | |
e02119d5 CM |
3977 | } |
3978 | ||
3979 | /* | |
3980 | * it is not safe to log dentry if the chunk root has added new | |
3981 | * chunks. This returns 0 if the dentry was logged, and 1 otherwise. | |
3982 | * If this returns 1, you must commit the transaction to safely get your | |
3983 | * data on disk. | |
3984 | */ | |
3985 | int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans, | |
3986 | struct btrfs_root *root, struct dentry *dentry) | |
3987 | { | |
6a912213 JB |
3988 | struct dentry *parent = dget_parent(dentry); |
3989 | int ret; | |
3990 | ||
3991 | ret = btrfs_log_inode_parent(trans, root, dentry->d_inode, parent, 0); | |
3992 | dput(parent); | |
3993 | ||
3994 | return ret; | |
e02119d5 CM |
3995 | } |
3996 | ||
3997 | /* | |
3998 | * should be called during mount to recover any replay any log trees | |
3999 | * from the FS | |
4000 | */ | |
4001 | int btrfs_recover_log_trees(struct btrfs_root *log_root_tree) | |
4002 | { | |
4003 | int ret; | |
4004 | struct btrfs_path *path; | |
4005 | struct btrfs_trans_handle *trans; | |
4006 | struct btrfs_key key; | |
4007 | struct btrfs_key found_key; | |
4008 | struct btrfs_key tmp_key; | |
4009 | struct btrfs_root *log; | |
4010 | struct btrfs_fs_info *fs_info = log_root_tree->fs_info; | |
4011 | struct walk_control wc = { | |
4012 | .process_func = process_one_buffer, | |
4013 | .stage = 0, | |
4014 | }; | |
4015 | ||
e02119d5 | 4016 | path = btrfs_alloc_path(); |
db5b493a TI |
4017 | if (!path) |
4018 | return -ENOMEM; | |
4019 | ||
4020 | fs_info->log_root_recovering = 1; | |
e02119d5 | 4021 | |
4a500fd1 | 4022 | trans = btrfs_start_transaction(fs_info->tree_root, 0); |
79787eaa JM |
4023 | if (IS_ERR(trans)) { |
4024 | ret = PTR_ERR(trans); | |
4025 | goto error; | |
4026 | } | |
e02119d5 CM |
4027 | |
4028 | wc.trans = trans; | |
4029 | wc.pin = 1; | |
4030 | ||
db5b493a | 4031 | ret = walk_log_tree(trans, log_root_tree, &wc); |
79787eaa JM |
4032 | if (ret) { |
4033 | btrfs_error(fs_info, ret, "Failed to pin buffers while " | |
4034 | "recovering log root tree."); | |
4035 | goto error; | |
4036 | } | |
e02119d5 CM |
4037 | |
4038 | again: | |
4039 | key.objectid = BTRFS_TREE_LOG_OBJECTID; | |
4040 | key.offset = (u64)-1; | |
4041 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
4042 | ||
d397712b | 4043 | while (1) { |
e02119d5 | 4044 | ret = btrfs_search_slot(NULL, log_root_tree, &key, path, 0, 0); |
79787eaa JM |
4045 | |
4046 | if (ret < 0) { | |
4047 | btrfs_error(fs_info, ret, | |
4048 | "Couldn't find tree log root."); | |
4049 | goto error; | |
4050 | } | |
e02119d5 CM |
4051 | if (ret > 0) { |
4052 | if (path->slots[0] == 0) | |
4053 | break; | |
4054 | path->slots[0]--; | |
4055 | } | |
4056 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
4057 | path->slots[0]); | |
b3b4aa74 | 4058 | btrfs_release_path(path); |
e02119d5 CM |
4059 | if (found_key.objectid != BTRFS_TREE_LOG_OBJECTID) |
4060 | break; | |
4061 | ||
4062 | log = btrfs_read_fs_root_no_radix(log_root_tree, | |
4063 | &found_key); | |
79787eaa JM |
4064 | if (IS_ERR(log)) { |
4065 | ret = PTR_ERR(log); | |
4066 | btrfs_error(fs_info, ret, | |
4067 | "Couldn't read tree log root."); | |
4068 | goto error; | |
4069 | } | |
e02119d5 CM |
4070 | |
4071 | tmp_key.objectid = found_key.offset; | |
4072 | tmp_key.type = BTRFS_ROOT_ITEM_KEY; | |
4073 | tmp_key.offset = (u64)-1; | |
4074 | ||
4075 | wc.replay_dest = btrfs_read_fs_root_no_name(fs_info, &tmp_key); | |
79787eaa JM |
4076 | if (IS_ERR(wc.replay_dest)) { |
4077 | ret = PTR_ERR(wc.replay_dest); | |
4078 | btrfs_error(fs_info, ret, "Couldn't read target root " | |
4079 | "for tree log recovery."); | |
4080 | goto error; | |
4081 | } | |
e02119d5 | 4082 | |
07d400a6 | 4083 | wc.replay_dest->log_root = log; |
5d4f98a2 | 4084 | btrfs_record_root_in_trans(trans, wc.replay_dest); |
e02119d5 CM |
4085 | ret = walk_log_tree(trans, log, &wc); |
4086 | BUG_ON(ret); | |
4087 | ||
4088 | if (wc.stage == LOG_WALK_REPLAY_ALL) { | |
4089 | ret = fixup_inode_link_counts(trans, wc.replay_dest, | |
4090 | path); | |
4091 | BUG_ON(ret); | |
4092 | } | |
4093 | ||
4094 | key.offset = found_key.offset - 1; | |
07d400a6 | 4095 | wc.replay_dest->log_root = NULL; |
e02119d5 | 4096 | free_extent_buffer(log->node); |
b263c2c8 | 4097 | free_extent_buffer(log->commit_root); |
e02119d5 CM |
4098 | kfree(log); |
4099 | ||
4100 | if (found_key.offset == 0) | |
4101 | break; | |
4102 | } | |
b3b4aa74 | 4103 | btrfs_release_path(path); |
e02119d5 CM |
4104 | |
4105 | /* step one is to pin it all, step two is to replay just inodes */ | |
4106 | if (wc.pin) { | |
4107 | wc.pin = 0; | |
4108 | wc.process_func = replay_one_buffer; | |
4109 | wc.stage = LOG_WALK_REPLAY_INODES; | |
4110 | goto again; | |
4111 | } | |
4112 | /* step three is to replay everything */ | |
4113 | if (wc.stage < LOG_WALK_REPLAY_ALL) { | |
4114 | wc.stage++; | |
4115 | goto again; | |
4116 | } | |
4117 | ||
4118 | btrfs_free_path(path); | |
4119 | ||
4120 | free_extent_buffer(log_root_tree->node); | |
4121 | log_root_tree->log_root = NULL; | |
4122 | fs_info->log_root_recovering = 0; | |
4123 | ||
4124 | /* step 4: commit the transaction, which also unpins the blocks */ | |
4125 | btrfs_commit_transaction(trans, fs_info->tree_root); | |
4126 | ||
4127 | kfree(log_root_tree); | |
4128 | return 0; | |
79787eaa JM |
4129 | |
4130 | error: | |
4131 | btrfs_free_path(path); | |
4132 | return ret; | |
e02119d5 | 4133 | } |
12fcfd22 CM |
4134 | |
4135 | /* | |
4136 | * there are some corner cases where we want to force a full | |
4137 | * commit instead of allowing a directory to be logged. | |
4138 | * | |
4139 | * They revolve around files there were unlinked from the directory, and | |
4140 | * this function updates the parent directory so that a full commit is | |
4141 | * properly done if it is fsync'd later after the unlinks are done. | |
4142 | */ | |
4143 | void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans, | |
4144 | struct inode *dir, struct inode *inode, | |
4145 | int for_rename) | |
4146 | { | |
af4176b4 CM |
4147 | /* |
4148 | * when we're logging a file, if it hasn't been renamed | |
4149 | * or unlinked, and its inode is fully committed on disk, | |
4150 | * we don't have to worry about walking up the directory chain | |
4151 | * to log its parents. | |
4152 | * | |
4153 | * So, we use the last_unlink_trans field to put this transid | |
4154 | * into the file. When the file is logged we check it and | |
4155 | * don't log the parents if the file is fully on disk. | |
4156 | */ | |
4157 | if (S_ISREG(inode->i_mode)) | |
4158 | BTRFS_I(inode)->last_unlink_trans = trans->transid; | |
4159 | ||
12fcfd22 CM |
4160 | /* |
4161 | * if this directory was already logged any new | |
4162 | * names for this file/dir will get recorded | |
4163 | */ | |
4164 | smp_mb(); | |
4165 | if (BTRFS_I(dir)->logged_trans == trans->transid) | |
4166 | return; | |
4167 | ||
4168 | /* | |
4169 | * if the inode we're about to unlink was logged, | |
4170 | * the log will be properly updated for any new names | |
4171 | */ | |
4172 | if (BTRFS_I(inode)->logged_trans == trans->transid) | |
4173 | return; | |
4174 | ||
4175 | /* | |
4176 | * when renaming files across directories, if the directory | |
4177 | * there we're unlinking from gets fsync'd later on, there's | |
4178 | * no way to find the destination directory later and fsync it | |
4179 | * properly. So, we have to be conservative and force commits | |
4180 | * so the new name gets discovered. | |
4181 | */ | |
4182 | if (for_rename) | |
4183 | goto record; | |
4184 | ||
4185 | /* we can safely do the unlink without any special recording */ | |
4186 | return; | |
4187 | ||
4188 | record: | |
4189 | BTRFS_I(dir)->last_unlink_trans = trans->transid; | |
4190 | } | |
4191 | ||
4192 | /* | |
4193 | * Call this after adding a new name for a file and it will properly | |
4194 | * update the log to reflect the new name. | |
4195 | * | |
4196 | * It will return zero if all goes well, and it will return 1 if a | |
4197 | * full transaction commit is required. | |
4198 | */ | |
4199 | int btrfs_log_new_name(struct btrfs_trans_handle *trans, | |
4200 | struct inode *inode, struct inode *old_dir, | |
4201 | struct dentry *parent) | |
4202 | { | |
4203 | struct btrfs_root * root = BTRFS_I(inode)->root; | |
4204 | ||
af4176b4 CM |
4205 | /* |
4206 | * this will force the logging code to walk the dentry chain | |
4207 | * up for the file | |
4208 | */ | |
4209 | if (S_ISREG(inode->i_mode)) | |
4210 | BTRFS_I(inode)->last_unlink_trans = trans->transid; | |
4211 | ||
12fcfd22 CM |
4212 | /* |
4213 | * if this inode hasn't been logged and directory we're renaming it | |
4214 | * from hasn't been logged, we don't need to log it | |
4215 | */ | |
4216 | if (BTRFS_I(inode)->logged_trans <= | |
4217 | root->fs_info->last_trans_committed && | |
4218 | (!old_dir || BTRFS_I(old_dir)->logged_trans <= | |
4219 | root->fs_info->last_trans_committed)) | |
4220 | return 0; | |
4221 | ||
4222 | return btrfs_log_inode_parent(trans, root, inode, parent, 1); | |
4223 | } | |
4224 |