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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> | |
20 | #include "ctree.h" | |
21 | #include "transaction.h" | |
22 | #include "disk-io.h" | |
23 | #include "locking.h" | |
24 | #include "print-tree.h" | |
25 | #include "compat.h" | |
b2950863 | 26 | #include "tree-log.h" |
e02119d5 CM |
27 | |
28 | /* magic values for the inode_only field in btrfs_log_inode: | |
29 | * | |
30 | * LOG_INODE_ALL means to log everything | |
31 | * LOG_INODE_EXISTS means to log just enough to recreate the inode | |
32 | * during log replay | |
33 | */ | |
34 | #define LOG_INODE_ALL 0 | |
35 | #define LOG_INODE_EXISTS 1 | |
36 | ||
12fcfd22 CM |
37 | /* |
38 | * directory trouble cases | |
39 | * | |
40 | * 1) on rename or unlink, if the inode being unlinked isn't in the fsync | |
41 | * log, we must force a full commit before doing an fsync of the directory | |
42 | * where the unlink was done. | |
43 | * ---> record transid of last unlink/rename per directory | |
44 | * | |
45 | * mkdir foo/some_dir | |
46 | * normal commit | |
47 | * rename foo/some_dir foo2/some_dir | |
48 | * mkdir foo/some_dir | |
49 | * fsync foo/some_dir/some_file | |
50 | * | |
51 | * The fsync above will unlink the original some_dir without recording | |
52 | * it in its new location (foo2). After a crash, some_dir will be gone | |
53 | * unless the fsync of some_file forces a full commit | |
54 | * | |
55 | * 2) we must log any new names for any file or dir that is in the fsync | |
56 | * log. ---> check inode while renaming/linking. | |
57 | * | |
58 | * 2a) we must log any new names for any file or dir during rename | |
59 | * when the directory they are being removed from was logged. | |
60 | * ---> check inode and old parent dir during rename | |
61 | * | |
62 | * 2a is actually the more important variant. With the extra logging | |
63 | * a crash might unlink the old name without recreating the new one | |
64 | * | |
65 | * 3) after a crash, we must go through any directories with a link count | |
66 | * of zero and redo the rm -rf | |
67 | * | |
68 | * mkdir f1/foo | |
69 | * normal commit | |
70 | * rm -rf f1/foo | |
71 | * fsync(f1) | |
72 | * | |
73 | * The directory f1 was fully removed from the FS, but fsync was never | |
74 | * called on f1, only its parent dir. After a crash the rm -rf must | |
75 | * be replayed. This must be able to recurse down the entire | |
76 | * directory tree. The inode link count fixup code takes care of the | |
77 | * ugly details. | |
78 | */ | |
79 | ||
e02119d5 CM |
80 | /* |
81 | * stages for the tree walking. The first | |
82 | * stage (0) is to only pin down the blocks we find | |
83 | * the second stage (1) is to make sure that all the inodes | |
84 | * we find in the log are created in the subvolume. | |
85 | * | |
86 | * The last stage is to deal with directories and links and extents | |
87 | * and all the other fun semantics | |
88 | */ | |
89 | #define LOG_WALK_PIN_ONLY 0 | |
90 | #define LOG_WALK_REPLAY_INODES 1 | |
91 | #define LOG_WALK_REPLAY_ALL 2 | |
92 | ||
12fcfd22 | 93 | static int btrfs_log_inode(struct btrfs_trans_handle *trans, |
e02119d5 CM |
94 | struct btrfs_root *root, struct inode *inode, |
95 | int inode_only); | |
ec051c0f YZ |
96 | static int link_to_fixup_dir(struct btrfs_trans_handle *trans, |
97 | struct btrfs_root *root, | |
98 | struct btrfs_path *path, u64 objectid); | |
12fcfd22 CM |
99 | static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, |
100 | struct btrfs_root *root, | |
101 | struct btrfs_root *log, | |
102 | struct btrfs_path *path, | |
103 | u64 dirid, int del_all); | |
e02119d5 CM |
104 | |
105 | /* | |
106 | * tree logging is a special write ahead log used to make sure that | |
107 | * fsyncs and O_SYNCs can happen without doing full tree commits. | |
108 | * | |
109 | * Full tree commits are expensive because they require commonly | |
110 | * modified blocks to be recowed, creating many dirty pages in the | |
111 | * extent tree an 4x-6x higher write load than ext3. | |
112 | * | |
113 | * Instead of doing a tree commit on every fsync, we use the | |
114 | * key ranges and transaction ids to find items for a given file or directory | |
115 | * that have changed in this transaction. Those items are copied into | |
116 | * a special tree (one per subvolume root), that tree is written to disk | |
117 | * and then the fsync is considered complete. | |
118 | * | |
119 | * After a crash, items are copied out of the log-tree back into the | |
120 | * subvolume tree. Any file data extents found are recorded in the extent | |
121 | * allocation tree, and the log-tree freed. | |
122 | * | |
123 | * The log tree is read three times, once to pin down all the extents it is | |
124 | * using in ram and once, once to create all the inodes logged in the tree | |
125 | * and once to do all the other items. | |
126 | */ | |
127 | ||
e02119d5 CM |
128 | /* |
129 | * start a sub transaction and setup the log tree | |
130 | * this increments the log tree writer count to make the people | |
131 | * syncing the tree wait for us to finish | |
132 | */ | |
133 | static int start_log_trans(struct btrfs_trans_handle *trans, | |
134 | struct btrfs_root *root) | |
135 | { | |
136 | int ret; | |
7237f183 YZ |
137 | |
138 | mutex_lock(&root->log_mutex); | |
139 | if (root->log_root) { | |
140 | root->log_batch++; | |
141 | atomic_inc(&root->log_writers); | |
142 | mutex_unlock(&root->log_mutex); | |
143 | return 0; | |
144 | } | |
e02119d5 CM |
145 | mutex_lock(&root->fs_info->tree_log_mutex); |
146 | if (!root->fs_info->log_root_tree) { | |
147 | ret = btrfs_init_log_root_tree(trans, root->fs_info); | |
148 | BUG_ON(ret); | |
149 | } | |
150 | if (!root->log_root) { | |
151 | ret = btrfs_add_log_tree(trans, root); | |
152 | BUG_ON(ret); | |
153 | } | |
e02119d5 | 154 | mutex_unlock(&root->fs_info->tree_log_mutex); |
7237f183 YZ |
155 | root->log_batch++; |
156 | atomic_inc(&root->log_writers); | |
157 | mutex_unlock(&root->log_mutex); | |
e02119d5 CM |
158 | return 0; |
159 | } | |
160 | ||
161 | /* | |
162 | * returns 0 if there was a log transaction running and we were able | |
163 | * to join, or returns -ENOENT if there were not transactions | |
164 | * in progress | |
165 | */ | |
166 | static int join_running_log_trans(struct btrfs_root *root) | |
167 | { | |
168 | int ret = -ENOENT; | |
169 | ||
170 | smp_mb(); | |
171 | if (!root->log_root) | |
172 | return -ENOENT; | |
173 | ||
7237f183 | 174 | mutex_lock(&root->log_mutex); |
e02119d5 CM |
175 | if (root->log_root) { |
176 | ret = 0; | |
7237f183 | 177 | atomic_inc(&root->log_writers); |
e02119d5 | 178 | } |
7237f183 | 179 | mutex_unlock(&root->log_mutex); |
e02119d5 CM |
180 | return ret; |
181 | } | |
182 | ||
12fcfd22 CM |
183 | /* |
184 | * This either makes the current running log transaction wait | |
185 | * until you call btrfs_end_log_trans() or it makes any future | |
186 | * log transactions wait until you call btrfs_end_log_trans() | |
187 | */ | |
188 | int btrfs_pin_log_trans(struct btrfs_root *root) | |
189 | { | |
190 | int ret = -ENOENT; | |
191 | ||
192 | mutex_lock(&root->log_mutex); | |
193 | atomic_inc(&root->log_writers); | |
194 | mutex_unlock(&root->log_mutex); | |
195 | return ret; | |
196 | } | |
197 | ||
e02119d5 CM |
198 | /* |
199 | * indicate we're done making changes to the log tree | |
200 | * and wake up anyone waiting to do a sync | |
201 | */ | |
12fcfd22 | 202 | int btrfs_end_log_trans(struct btrfs_root *root) |
e02119d5 | 203 | { |
7237f183 YZ |
204 | if (atomic_dec_and_test(&root->log_writers)) { |
205 | smp_mb(); | |
206 | if (waitqueue_active(&root->log_writer_wait)) | |
207 | wake_up(&root->log_writer_wait); | |
208 | } | |
e02119d5 CM |
209 | return 0; |
210 | } | |
211 | ||
212 | ||
213 | /* | |
214 | * the walk control struct is used to pass state down the chain when | |
215 | * processing the log tree. The stage field tells us which part | |
216 | * of the log tree processing we are currently doing. The others | |
217 | * are state fields used for that specific part | |
218 | */ | |
219 | struct walk_control { | |
220 | /* should we free the extent on disk when done? This is used | |
221 | * at transaction commit time while freeing a log tree | |
222 | */ | |
223 | int free; | |
224 | ||
225 | /* should we write out the extent buffer? This is used | |
226 | * while flushing the log tree to disk during a sync | |
227 | */ | |
228 | int write; | |
229 | ||
230 | /* should we wait for the extent buffer io to finish? Also used | |
231 | * while flushing the log tree to disk for a sync | |
232 | */ | |
233 | int wait; | |
234 | ||
235 | /* pin only walk, we record which extents on disk belong to the | |
236 | * log trees | |
237 | */ | |
238 | int pin; | |
239 | ||
240 | /* what stage of the replay code we're currently in */ | |
241 | int stage; | |
242 | ||
243 | /* the root we are currently replaying */ | |
244 | struct btrfs_root *replay_dest; | |
245 | ||
246 | /* the trans handle for the current replay */ | |
247 | struct btrfs_trans_handle *trans; | |
248 | ||
249 | /* the function that gets used to process blocks we find in the | |
250 | * tree. Note the extent_buffer might not be up to date when it is | |
251 | * passed in, and it must be checked or read if you need the data | |
252 | * inside it | |
253 | */ | |
254 | int (*process_func)(struct btrfs_root *log, struct extent_buffer *eb, | |
255 | struct walk_control *wc, u64 gen); | |
256 | }; | |
257 | ||
258 | /* | |
259 | * process_func used to pin down extents, write them or wait on them | |
260 | */ | |
261 | static int process_one_buffer(struct btrfs_root *log, | |
262 | struct extent_buffer *eb, | |
263 | struct walk_control *wc, u64 gen) | |
264 | { | |
265 | if (wc->pin) { | |
25179201 | 266 | mutex_lock(&log->fs_info->pinned_mutex); |
e02119d5 CM |
267 | btrfs_update_pinned_extents(log->fs_info->extent_root, |
268 | eb->start, eb->len, 1); | |
e02119d5 CM |
269 | } |
270 | ||
271 | if (btrfs_buffer_uptodate(eb, gen)) { | |
272 | if (wc->write) | |
273 | btrfs_write_tree_block(eb); | |
274 | if (wc->wait) | |
275 | btrfs_wait_tree_block_writeback(eb); | |
276 | } | |
277 | return 0; | |
278 | } | |
279 | ||
280 | /* | |
281 | * Item overwrite used by replay and tree logging. eb, slot and key all refer | |
282 | * to the src data we are copying out. | |
283 | * | |
284 | * root is the tree we are copying into, and path is a scratch | |
285 | * path for use in this function (it should be released on entry and | |
286 | * will be released on exit). | |
287 | * | |
288 | * If the key is already in the destination tree the existing item is | |
289 | * overwritten. If the existing item isn't big enough, it is extended. | |
290 | * If it is too large, it is truncated. | |
291 | * | |
292 | * If the key isn't in the destination yet, a new item is inserted. | |
293 | */ | |
294 | static noinline int overwrite_item(struct btrfs_trans_handle *trans, | |
295 | struct btrfs_root *root, | |
296 | struct btrfs_path *path, | |
297 | struct extent_buffer *eb, int slot, | |
298 | struct btrfs_key *key) | |
299 | { | |
300 | int ret; | |
301 | u32 item_size; | |
302 | u64 saved_i_size = 0; | |
303 | int save_old_i_size = 0; | |
304 | unsigned long src_ptr; | |
305 | unsigned long dst_ptr; | |
306 | int overwrite_root = 0; | |
307 | ||
308 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
309 | overwrite_root = 1; | |
310 | ||
311 | item_size = btrfs_item_size_nr(eb, slot); | |
312 | src_ptr = btrfs_item_ptr_offset(eb, slot); | |
313 | ||
314 | /* look for the key in the destination tree */ | |
315 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); | |
316 | if (ret == 0) { | |
317 | char *src_copy; | |
318 | char *dst_copy; | |
319 | u32 dst_size = btrfs_item_size_nr(path->nodes[0], | |
320 | path->slots[0]); | |
321 | if (dst_size != item_size) | |
322 | goto insert; | |
323 | ||
324 | if (item_size == 0) { | |
325 | btrfs_release_path(root, path); | |
326 | return 0; | |
327 | } | |
328 | dst_copy = kmalloc(item_size, GFP_NOFS); | |
329 | src_copy = kmalloc(item_size, GFP_NOFS); | |
330 | ||
331 | read_extent_buffer(eb, src_copy, src_ptr, item_size); | |
332 | ||
333 | dst_ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); | |
334 | read_extent_buffer(path->nodes[0], dst_copy, dst_ptr, | |
335 | item_size); | |
336 | ret = memcmp(dst_copy, src_copy, item_size); | |
337 | ||
338 | kfree(dst_copy); | |
339 | kfree(src_copy); | |
340 | /* | |
341 | * they have the same contents, just return, this saves | |
342 | * us from cowing blocks in the destination tree and doing | |
343 | * extra writes that may not have been done by a previous | |
344 | * sync | |
345 | */ | |
346 | if (ret == 0) { | |
347 | btrfs_release_path(root, path); | |
348 | return 0; | |
349 | } | |
350 | ||
351 | } | |
352 | insert: | |
353 | btrfs_release_path(root, path); | |
354 | /* try to insert the key into the destination tree */ | |
355 | ret = btrfs_insert_empty_item(trans, root, path, | |
356 | key, item_size); | |
357 | ||
358 | /* make sure any existing item is the correct size */ | |
359 | if (ret == -EEXIST) { | |
360 | u32 found_size; | |
361 | found_size = btrfs_item_size_nr(path->nodes[0], | |
362 | path->slots[0]); | |
363 | if (found_size > item_size) { | |
364 | btrfs_truncate_item(trans, root, path, item_size, 1); | |
365 | } else if (found_size < item_size) { | |
87b29b20 YZ |
366 | ret = btrfs_extend_item(trans, root, path, |
367 | item_size - found_size); | |
e02119d5 CM |
368 | BUG_ON(ret); |
369 | } | |
370 | } else if (ret) { | |
371 | BUG(); | |
372 | } | |
373 | dst_ptr = btrfs_item_ptr_offset(path->nodes[0], | |
374 | path->slots[0]); | |
375 | ||
376 | /* don't overwrite an existing inode if the generation number | |
377 | * was logged as zero. This is done when the tree logging code | |
378 | * is just logging an inode to make sure it exists after recovery. | |
379 | * | |
380 | * Also, don't overwrite i_size on directories during replay. | |
381 | * log replay inserts and removes directory items based on the | |
382 | * state of the tree found in the subvolume, and i_size is modified | |
383 | * as it goes | |
384 | */ | |
385 | if (key->type == BTRFS_INODE_ITEM_KEY && ret == -EEXIST) { | |
386 | struct btrfs_inode_item *src_item; | |
387 | struct btrfs_inode_item *dst_item; | |
388 | ||
389 | src_item = (struct btrfs_inode_item *)src_ptr; | |
390 | dst_item = (struct btrfs_inode_item *)dst_ptr; | |
391 | ||
392 | if (btrfs_inode_generation(eb, src_item) == 0) | |
393 | goto no_copy; | |
394 | ||
395 | if (overwrite_root && | |
396 | S_ISDIR(btrfs_inode_mode(eb, src_item)) && | |
397 | S_ISDIR(btrfs_inode_mode(path->nodes[0], dst_item))) { | |
398 | save_old_i_size = 1; | |
399 | saved_i_size = btrfs_inode_size(path->nodes[0], | |
400 | dst_item); | |
401 | } | |
402 | } | |
403 | ||
404 | copy_extent_buffer(path->nodes[0], eb, dst_ptr, | |
405 | src_ptr, item_size); | |
406 | ||
407 | if (save_old_i_size) { | |
408 | struct btrfs_inode_item *dst_item; | |
409 | dst_item = (struct btrfs_inode_item *)dst_ptr; | |
410 | btrfs_set_inode_size(path->nodes[0], dst_item, saved_i_size); | |
411 | } | |
412 | ||
413 | /* make sure the generation is filled in */ | |
414 | if (key->type == BTRFS_INODE_ITEM_KEY) { | |
415 | struct btrfs_inode_item *dst_item; | |
416 | dst_item = (struct btrfs_inode_item *)dst_ptr; | |
417 | if (btrfs_inode_generation(path->nodes[0], dst_item) == 0) { | |
418 | btrfs_set_inode_generation(path->nodes[0], dst_item, | |
419 | trans->transid); | |
420 | } | |
421 | } | |
422 | no_copy: | |
423 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
424 | btrfs_release_path(root, path); | |
425 | return 0; | |
426 | } | |
427 | ||
428 | /* | |
429 | * simple helper to read an inode off the disk from a given root | |
430 | * This can only be called for subvolume roots and not for the log | |
431 | */ | |
432 | static noinline struct inode *read_one_inode(struct btrfs_root *root, | |
433 | u64 objectid) | |
434 | { | |
435 | struct inode *inode; | |
436 | inode = btrfs_iget_locked(root->fs_info->sb, objectid, root); | |
437 | if (inode->i_state & I_NEW) { | |
438 | BTRFS_I(inode)->root = root; | |
439 | BTRFS_I(inode)->location.objectid = objectid; | |
440 | BTRFS_I(inode)->location.type = BTRFS_INODE_ITEM_KEY; | |
441 | BTRFS_I(inode)->location.offset = 0; | |
442 | btrfs_read_locked_inode(inode); | |
443 | unlock_new_inode(inode); | |
444 | ||
445 | } | |
446 | if (is_bad_inode(inode)) { | |
447 | iput(inode); | |
448 | inode = NULL; | |
449 | } | |
450 | return inode; | |
451 | } | |
452 | ||
453 | /* replays a single extent in 'eb' at 'slot' with 'key' into the | |
454 | * subvolume 'root'. path is released on entry and should be released | |
455 | * on exit. | |
456 | * | |
457 | * extents in the log tree have not been allocated out of the extent | |
458 | * tree yet. So, this completes the allocation, taking a reference | |
459 | * as required if the extent already exists or creating a new extent | |
460 | * if it isn't in the extent allocation tree yet. | |
461 | * | |
462 | * The extent is inserted into the file, dropping any existing extents | |
463 | * from the file that overlap the new one. | |
464 | */ | |
465 | static noinline int replay_one_extent(struct btrfs_trans_handle *trans, | |
466 | struct btrfs_root *root, | |
467 | struct btrfs_path *path, | |
468 | struct extent_buffer *eb, int slot, | |
469 | struct btrfs_key *key) | |
470 | { | |
471 | int found_type; | |
472 | u64 mask = root->sectorsize - 1; | |
473 | u64 extent_end; | |
474 | u64 alloc_hint; | |
475 | u64 start = key->offset; | |
07d400a6 | 476 | u64 saved_nbytes; |
e02119d5 CM |
477 | struct btrfs_file_extent_item *item; |
478 | struct inode *inode = NULL; | |
479 | unsigned long size; | |
480 | int ret = 0; | |
481 | ||
482 | item = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item); | |
483 | found_type = btrfs_file_extent_type(eb, item); | |
484 | ||
d899e052 YZ |
485 | if (found_type == BTRFS_FILE_EXTENT_REG || |
486 | found_type == BTRFS_FILE_EXTENT_PREALLOC) | |
e02119d5 CM |
487 | extent_end = start + btrfs_file_extent_num_bytes(eb, item); |
488 | else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
c8b97818 | 489 | size = btrfs_file_extent_inline_len(eb, item); |
e02119d5 CM |
490 | extent_end = (start + size + mask) & ~mask; |
491 | } else { | |
492 | ret = 0; | |
493 | goto out; | |
494 | } | |
495 | ||
496 | inode = read_one_inode(root, key->objectid); | |
497 | if (!inode) { | |
498 | ret = -EIO; | |
499 | goto out; | |
500 | } | |
501 | ||
502 | /* | |
503 | * first check to see if we already have this extent in the | |
504 | * file. This must be done before the btrfs_drop_extents run | |
505 | * so we don't try to drop this extent. | |
506 | */ | |
507 | ret = btrfs_lookup_file_extent(trans, root, path, inode->i_ino, | |
508 | start, 0); | |
509 | ||
d899e052 YZ |
510 | if (ret == 0 && |
511 | (found_type == BTRFS_FILE_EXTENT_REG || | |
512 | found_type == BTRFS_FILE_EXTENT_PREALLOC)) { | |
e02119d5 CM |
513 | struct btrfs_file_extent_item cmp1; |
514 | struct btrfs_file_extent_item cmp2; | |
515 | struct btrfs_file_extent_item *existing; | |
516 | struct extent_buffer *leaf; | |
517 | ||
518 | leaf = path->nodes[0]; | |
519 | existing = btrfs_item_ptr(leaf, path->slots[0], | |
520 | struct btrfs_file_extent_item); | |
521 | ||
522 | read_extent_buffer(eb, &cmp1, (unsigned long)item, | |
523 | sizeof(cmp1)); | |
524 | read_extent_buffer(leaf, &cmp2, (unsigned long)existing, | |
525 | sizeof(cmp2)); | |
526 | ||
527 | /* | |
528 | * we already have a pointer to this exact extent, | |
529 | * we don't have to do anything | |
530 | */ | |
531 | if (memcmp(&cmp1, &cmp2, sizeof(cmp1)) == 0) { | |
532 | btrfs_release_path(root, path); | |
533 | goto out; | |
534 | } | |
535 | } | |
536 | btrfs_release_path(root, path); | |
537 | ||
07d400a6 | 538 | saved_nbytes = inode_get_bytes(inode); |
e02119d5 CM |
539 | /* drop any overlapping extents */ |
540 | ret = btrfs_drop_extents(trans, root, inode, | |
541 | start, extent_end, start, &alloc_hint); | |
542 | BUG_ON(ret); | |
543 | ||
07d400a6 YZ |
544 | if (found_type == BTRFS_FILE_EXTENT_REG || |
545 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
546 | unsigned long dest_offset; | |
547 | struct btrfs_key ins; | |
548 | ||
549 | ret = btrfs_insert_empty_item(trans, root, path, key, | |
550 | sizeof(*item)); | |
551 | BUG_ON(ret); | |
552 | dest_offset = btrfs_item_ptr_offset(path->nodes[0], | |
553 | path->slots[0]); | |
554 | copy_extent_buffer(path->nodes[0], eb, dest_offset, | |
555 | (unsigned long)item, sizeof(*item)); | |
556 | ||
557 | ins.objectid = btrfs_file_extent_disk_bytenr(eb, item); | |
558 | ins.offset = btrfs_file_extent_disk_num_bytes(eb, item); | |
559 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
560 | ||
561 | if (ins.objectid > 0) { | |
562 | u64 csum_start; | |
563 | u64 csum_end; | |
564 | LIST_HEAD(ordered_sums); | |
565 | /* | |
566 | * is this extent already allocated in the extent | |
567 | * allocation tree? If so, just add a reference | |
568 | */ | |
569 | ret = btrfs_lookup_extent(root, ins.objectid, | |
570 | ins.offset); | |
571 | if (ret == 0) { | |
572 | ret = btrfs_inc_extent_ref(trans, root, | |
573 | ins.objectid, ins.offset, | |
574 | path->nodes[0]->start, | |
575 | root->root_key.objectid, | |
576 | trans->transid, key->objectid); | |
577 | } else { | |
578 | /* | |
579 | * insert the extent pointer in the extent | |
580 | * allocation tree | |
581 | */ | |
582 | ret = btrfs_alloc_logged_extent(trans, root, | |
583 | path->nodes[0]->start, | |
584 | root->root_key.objectid, | |
585 | trans->transid, key->objectid, | |
586 | &ins); | |
587 | BUG_ON(ret); | |
588 | } | |
589 | btrfs_release_path(root, path); | |
590 | ||
591 | if (btrfs_file_extent_compression(eb, item)) { | |
592 | csum_start = ins.objectid; | |
593 | csum_end = csum_start + ins.offset; | |
594 | } else { | |
595 | csum_start = ins.objectid + | |
596 | btrfs_file_extent_offset(eb, item); | |
597 | csum_end = csum_start + | |
598 | btrfs_file_extent_num_bytes(eb, item); | |
599 | } | |
600 | ||
601 | ret = btrfs_lookup_csums_range(root->log_root, | |
602 | csum_start, csum_end - 1, | |
603 | &ordered_sums); | |
604 | BUG_ON(ret); | |
605 | while (!list_empty(&ordered_sums)) { | |
606 | struct btrfs_ordered_sum *sums; | |
607 | sums = list_entry(ordered_sums.next, | |
608 | struct btrfs_ordered_sum, | |
609 | list); | |
610 | ret = btrfs_csum_file_blocks(trans, | |
611 | root->fs_info->csum_root, | |
612 | sums); | |
613 | BUG_ON(ret); | |
614 | list_del(&sums->list); | |
615 | kfree(sums); | |
616 | } | |
617 | } else { | |
618 | btrfs_release_path(root, path); | |
619 | } | |
620 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
621 | /* inline extents are easy, we just overwrite them */ | |
622 | ret = overwrite_item(trans, root, path, eb, slot, key); | |
623 | BUG_ON(ret); | |
624 | } | |
e02119d5 | 625 | |
07d400a6 | 626 | inode_set_bytes(inode, saved_nbytes); |
e02119d5 CM |
627 | btrfs_update_inode(trans, root, inode); |
628 | out: | |
629 | if (inode) | |
630 | iput(inode); | |
631 | return ret; | |
632 | } | |
633 | ||
634 | /* | |
635 | * when cleaning up conflicts between the directory names in the | |
636 | * subvolume, directory names in the log and directory names in the | |
637 | * inode back references, we may have to unlink inodes from directories. | |
638 | * | |
639 | * This is a helper function to do the unlink of a specific directory | |
640 | * item | |
641 | */ | |
642 | static noinline int drop_one_dir_item(struct btrfs_trans_handle *trans, | |
643 | struct btrfs_root *root, | |
644 | struct btrfs_path *path, | |
645 | struct inode *dir, | |
646 | struct btrfs_dir_item *di) | |
647 | { | |
648 | struct inode *inode; | |
649 | char *name; | |
650 | int name_len; | |
651 | struct extent_buffer *leaf; | |
652 | struct btrfs_key location; | |
653 | int ret; | |
654 | ||
655 | leaf = path->nodes[0]; | |
656 | ||
657 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
658 | name_len = btrfs_dir_name_len(leaf, di); | |
659 | name = kmalloc(name_len, GFP_NOFS); | |
660 | read_extent_buffer(leaf, name, (unsigned long)(di + 1), name_len); | |
661 | btrfs_release_path(root, path); | |
662 | ||
663 | inode = read_one_inode(root, location.objectid); | |
664 | BUG_ON(!inode); | |
665 | ||
ec051c0f YZ |
666 | ret = link_to_fixup_dir(trans, root, path, location.objectid); |
667 | BUG_ON(ret); | |
12fcfd22 | 668 | |
e02119d5 | 669 | ret = btrfs_unlink_inode(trans, root, dir, inode, name, name_len); |
ec051c0f | 670 | BUG_ON(ret); |
e02119d5 CM |
671 | kfree(name); |
672 | ||
673 | iput(inode); | |
674 | return ret; | |
675 | } | |
676 | ||
677 | /* | |
678 | * helper function to see if a given name and sequence number found | |
679 | * in an inode back reference are already in a directory and correctly | |
680 | * point to this inode | |
681 | */ | |
682 | static noinline int inode_in_dir(struct btrfs_root *root, | |
683 | struct btrfs_path *path, | |
684 | u64 dirid, u64 objectid, u64 index, | |
685 | const char *name, int name_len) | |
686 | { | |
687 | struct btrfs_dir_item *di; | |
688 | struct btrfs_key location; | |
689 | int match = 0; | |
690 | ||
691 | di = btrfs_lookup_dir_index_item(NULL, root, path, dirid, | |
692 | index, name, name_len, 0); | |
693 | if (di && !IS_ERR(di)) { | |
694 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
695 | if (location.objectid != objectid) | |
696 | goto out; | |
697 | } else | |
698 | goto out; | |
699 | btrfs_release_path(root, path); | |
700 | ||
701 | di = btrfs_lookup_dir_item(NULL, root, path, dirid, name, name_len, 0); | |
702 | if (di && !IS_ERR(di)) { | |
703 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
704 | if (location.objectid != objectid) | |
705 | goto out; | |
706 | } else | |
707 | goto out; | |
708 | match = 1; | |
709 | out: | |
710 | btrfs_release_path(root, path); | |
711 | return match; | |
712 | } | |
713 | ||
714 | /* | |
715 | * helper function to check a log tree for a named back reference in | |
716 | * an inode. This is used to decide if a back reference that is | |
717 | * found in the subvolume conflicts with what we find in the log. | |
718 | * | |
719 | * inode backreferences may have multiple refs in a single item, | |
720 | * during replay we process one reference at a time, and we don't | |
721 | * want to delete valid links to a file from the subvolume if that | |
722 | * link is also in the log. | |
723 | */ | |
724 | static noinline int backref_in_log(struct btrfs_root *log, | |
725 | struct btrfs_key *key, | |
726 | char *name, int namelen) | |
727 | { | |
728 | struct btrfs_path *path; | |
729 | struct btrfs_inode_ref *ref; | |
730 | unsigned long ptr; | |
731 | unsigned long ptr_end; | |
732 | unsigned long name_ptr; | |
733 | int found_name_len; | |
734 | int item_size; | |
735 | int ret; | |
736 | int match = 0; | |
737 | ||
738 | path = btrfs_alloc_path(); | |
739 | ret = btrfs_search_slot(NULL, log, key, path, 0, 0); | |
740 | if (ret != 0) | |
741 | goto out; | |
742 | ||
743 | item_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]); | |
744 | ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); | |
745 | ptr_end = ptr + item_size; | |
746 | while (ptr < ptr_end) { | |
747 | ref = (struct btrfs_inode_ref *)ptr; | |
748 | found_name_len = btrfs_inode_ref_name_len(path->nodes[0], ref); | |
749 | if (found_name_len == namelen) { | |
750 | name_ptr = (unsigned long)(ref + 1); | |
751 | ret = memcmp_extent_buffer(path->nodes[0], name, | |
752 | name_ptr, namelen); | |
753 | if (ret == 0) { | |
754 | match = 1; | |
755 | goto out; | |
756 | } | |
757 | } | |
758 | ptr = (unsigned long)(ref + 1) + found_name_len; | |
759 | } | |
760 | out: | |
761 | btrfs_free_path(path); | |
762 | return match; | |
763 | } | |
764 | ||
765 | ||
766 | /* | |
767 | * replay one inode back reference item found in the log tree. | |
768 | * eb, slot and key refer to the buffer and key found in the log tree. | |
769 | * root is the destination we are replaying into, and path is for temp | |
770 | * use by this function. (it should be released on return). | |
771 | */ | |
772 | static noinline int add_inode_ref(struct btrfs_trans_handle *trans, | |
773 | struct btrfs_root *root, | |
774 | struct btrfs_root *log, | |
775 | struct btrfs_path *path, | |
776 | struct extent_buffer *eb, int slot, | |
777 | struct btrfs_key *key) | |
778 | { | |
779 | struct inode *dir; | |
780 | int ret; | |
781 | struct btrfs_key location; | |
782 | struct btrfs_inode_ref *ref; | |
783 | struct btrfs_dir_item *di; | |
784 | struct inode *inode; | |
785 | char *name; | |
786 | int namelen; | |
787 | unsigned long ref_ptr; | |
788 | unsigned long ref_end; | |
789 | ||
790 | location.objectid = key->objectid; | |
791 | location.type = BTRFS_INODE_ITEM_KEY; | |
792 | location.offset = 0; | |
793 | ||
794 | /* | |
795 | * it is possible that we didn't log all the parent directories | |
796 | * for a given inode. If we don't find the dir, just don't | |
797 | * copy the back ref in. The link count fixup code will take | |
798 | * care of the rest | |
799 | */ | |
800 | dir = read_one_inode(root, key->offset); | |
801 | if (!dir) | |
802 | return -ENOENT; | |
803 | ||
804 | inode = read_one_inode(root, key->objectid); | |
805 | BUG_ON(!dir); | |
806 | ||
807 | ref_ptr = btrfs_item_ptr_offset(eb, slot); | |
808 | ref_end = ref_ptr + btrfs_item_size_nr(eb, slot); | |
809 | ||
810 | again: | |
811 | ref = (struct btrfs_inode_ref *)ref_ptr; | |
812 | ||
813 | namelen = btrfs_inode_ref_name_len(eb, ref); | |
814 | name = kmalloc(namelen, GFP_NOFS); | |
815 | BUG_ON(!name); | |
816 | ||
817 | read_extent_buffer(eb, name, (unsigned long)(ref + 1), namelen); | |
818 | ||
819 | /* if we already have a perfect match, we're done */ | |
820 | if (inode_in_dir(root, path, dir->i_ino, inode->i_ino, | |
821 | btrfs_inode_ref_index(eb, ref), | |
822 | name, namelen)) { | |
823 | goto out; | |
824 | } | |
825 | ||
826 | /* | |
827 | * look for a conflicting back reference in the metadata. | |
828 | * if we find one we have to unlink that name of the file | |
829 | * before we add our new link. Later on, we overwrite any | |
830 | * existing back reference, and we don't want to create | |
831 | * dangling pointers in the directory. | |
832 | */ | |
833 | conflict_again: | |
834 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); | |
835 | if (ret == 0) { | |
836 | char *victim_name; | |
837 | int victim_name_len; | |
838 | struct btrfs_inode_ref *victim_ref; | |
839 | unsigned long ptr; | |
840 | unsigned long ptr_end; | |
841 | struct extent_buffer *leaf = path->nodes[0]; | |
842 | ||
843 | /* are we trying to overwrite a back ref for the root directory | |
844 | * if so, just jump out, we're done | |
845 | */ | |
846 | if (key->objectid == key->offset) | |
847 | goto out_nowrite; | |
848 | ||
849 | /* check all the names in this back reference to see | |
850 | * if they are in the log. if so, we allow them to stay | |
851 | * otherwise they must be unlinked as a conflict | |
852 | */ | |
853 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
854 | ptr_end = ptr + btrfs_item_size_nr(leaf, path->slots[0]); | |
d397712b | 855 | while (ptr < ptr_end) { |
e02119d5 CM |
856 | victim_ref = (struct btrfs_inode_ref *)ptr; |
857 | victim_name_len = btrfs_inode_ref_name_len(leaf, | |
858 | victim_ref); | |
859 | victim_name = kmalloc(victim_name_len, GFP_NOFS); | |
860 | BUG_ON(!victim_name); | |
861 | ||
862 | read_extent_buffer(leaf, victim_name, | |
863 | (unsigned long)(victim_ref + 1), | |
864 | victim_name_len); | |
865 | ||
866 | if (!backref_in_log(log, key, victim_name, | |
867 | victim_name_len)) { | |
868 | btrfs_inc_nlink(inode); | |
869 | btrfs_release_path(root, path); | |
12fcfd22 | 870 | |
e02119d5 CM |
871 | ret = btrfs_unlink_inode(trans, root, dir, |
872 | inode, victim_name, | |
873 | victim_name_len); | |
874 | kfree(victim_name); | |
875 | btrfs_release_path(root, path); | |
876 | goto conflict_again; | |
877 | } | |
878 | kfree(victim_name); | |
879 | ptr = (unsigned long)(victim_ref + 1) + victim_name_len; | |
880 | } | |
881 | BUG_ON(ret); | |
882 | } | |
883 | btrfs_release_path(root, path); | |
884 | ||
885 | /* look for a conflicting sequence number */ | |
886 | di = btrfs_lookup_dir_index_item(trans, root, path, dir->i_ino, | |
887 | btrfs_inode_ref_index(eb, ref), | |
888 | name, namelen, 0); | |
889 | if (di && !IS_ERR(di)) { | |
890 | ret = drop_one_dir_item(trans, root, path, dir, di); | |
891 | BUG_ON(ret); | |
892 | } | |
893 | btrfs_release_path(root, path); | |
894 | ||
895 | ||
896 | /* look for a conflicting name */ | |
897 | di = btrfs_lookup_dir_item(trans, root, path, dir->i_ino, | |
898 | name, namelen, 0); | |
899 | if (di && !IS_ERR(di)) { | |
900 | ret = drop_one_dir_item(trans, root, path, dir, di); | |
901 | BUG_ON(ret); | |
902 | } | |
903 | btrfs_release_path(root, path); | |
904 | ||
905 | /* insert our name */ | |
906 | ret = btrfs_add_link(trans, dir, inode, name, namelen, 0, | |
907 | btrfs_inode_ref_index(eb, ref)); | |
908 | BUG_ON(ret); | |
909 | ||
910 | btrfs_update_inode(trans, root, inode); | |
911 | ||
912 | out: | |
913 | ref_ptr = (unsigned long)(ref + 1) + namelen; | |
914 | kfree(name); | |
915 | if (ref_ptr < ref_end) | |
916 | goto again; | |
917 | ||
918 | /* finally write the back reference in the inode */ | |
919 | ret = overwrite_item(trans, root, path, eb, slot, key); | |
920 | BUG_ON(ret); | |
921 | ||
922 | out_nowrite: | |
923 | btrfs_release_path(root, path); | |
924 | iput(dir); | |
925 | iput(inode); | |
926 | return 0; | |
927 | } | |
928 | ||
e02119d5 CM |
929 | /* |
930 | * There are a few corners where the link count of the file can't | |
931 | * be properly maintained during replay. So, instead of adding | |
932 | * lots of complexity to the log code, we just scan the backrefs | |
933 | * for any file that has been through replay. | |
934 | * | |
935 | * The scan will update the link count on the inode to reflect the | |
936 | * number of back refs found. If it goes down to zero, the iput | |
937 | * will free the inode. | |
938 | */ | |
939 | static noinline int fixup_inode_link_count(struct btrfs_trans_handle *trans, | |
940 | struct btrfs_root *root, | |
941 | struct inode *inode) | |
942 | { | |
943 | struct btrfs_path *path; | |
944 | int ret; | |
945 | struct btrfs_key key; | |
946 | u64 nlink = 0; | |
947 | unsigned long ptr; | |
948 | unsigned long ptr_end; | |
949 | int name_len; | |
950 | ||
951 | key.objectid = inode->i_ino; | |
952 | key.type = BTRFS_INODE_REF_KEY; | |
953 | key.offset = (u64)-1; | |
954 | ||
955 | path = btrfs_alloc_path(); | |
956 | ||
d397712b | 957 | while (1) { |
e02119d5 CM |
958 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
959 | if (ret < 0) | |
960 | break; | |
961 | if (ret > 0) { | |
962 | if (path->slots[0] == 0) | |
963 | break; | |
964 | path->slots[0]--; | |
965 | } | |
966 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
967 | path->slots[0]); | |
968 | if (key.objectid != inode->i_ino || | |
969 | key.type != BTRFS_INODE_REF_KEY) | |
970 | break; | |
971 | ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); | |
972 | ptr_end = ptr + btrfs_item_size_nr(path->nodes[0], | |
973 | path->slots[0]); | |
d397712b | 974 | while (ptr < ptr_end) { |
e02119d5 CM |
975 | struct btrfs_inode_ref *ref; |
976 | ||
977 | ref = (struct btrfs_inode_ref *)ptr; | |
978 | name_len = btrfs_inode_ref_name_len(path->nodes[0], | |
979 | ref); | |
980 | ptr = (unsigned long)(ref + 1) + name_len; | |
981 | nlink++; | |
982 | } | |
983 | ||
984 | if (key.offset == 0) | |
985 | break; | |
986 | key.offset--; | |
987 | btrfs_release_path(root, path); | |
988 | } | |
12fcfd22 | 989 | btrfs_release_path(root, path); |
e02119d5 CM |
990 | if (nlink != inode->i_nlink) { |
991 | inode->i_nlink = nlink; | |
992 | btrfs_update_inode(trans, root, inode); | |
993 | } | |
8d5bf1cb | 994 | BTRFS_I(inode)->index_cnt = (u64)-1; |
e02119d5 | 995 | |
12fcfd22 CM |
996 | if (inode->i_nlink == 0 && S_ISDIR(inode->i_mode)) { |
997 | ret = replay_dir_deletes(trans, root, NULL, path, | |
998 | inode->i_ino, 1); | |
999 | BUG_ON(ret); | |
1000 | } | |
1001 | btrfs_free_path(path); | |
1002 | ||
e02119d5 CM |
1003 | return 0; |
1004 | } | |
1005 | ||
1006 | static noinline int fixup_inode_link_counts(struct btrfs_trans_handle *trans, | |
1007 | struct btrfs_root *root, | |
1008 | struct btrfs_path *path) | |
1009 | { | |
1010 | int ret; | |
1011 | struct btrfs_key key; | |
1012 | struct inode *inode; | |
1013 | ||
1014 | key.objectid = BTRFS_TREE_LOG_FIXUP_OBJECTID; | |
1015 | key.type = BTRFS_ORPHAN_ITEM_KEY; | |
1016 | key.offset = (u64)-1; | |
d397712b | 1017 | while (1) { |
e02119d5 CM |
1018 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1019 | if (ret < 0) | |
1020 | break; | |
1021 | ||
1022 | if (ret == 1) { | |
1023 | if (path->slots[0] == 0) | |
1024 | break; | |
1025 | path->slots[0]--; | |
1026 | } | |
1027 | ||
1028 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1029 | if (key.objectid != BTRFS_TREE_LOG_FIXUP_OBJECTID || | |
1030 | key.type != BTRFS_ORPHAN_ITEM_KEY) | |
1031 | break; | |
1032 | ||
1033 | ret = btrfs_del_item(trans, root, path); | |
1034 | BUG_ON(ret); | |
1035 | ||
1036 | btrfs_release_path(root, path); | |
1037 | inode = read_one_inode(root, key.offset); | |
1038 | BUG_ON(!inode); | |
1039 | ||
1040 | ret = fixup_inode_link_count(trans, root, inode); | |
1041 | BUG_ON(ret); | |
1042 | ||
1043 | iput(inode); | |
1044 | ||
12fcfd22 CM |
1045 | /* |
1046 | * fixup on a directory may create new entries, | |
1047 | * make sure we always look for the highset possible | |
1048 | * offset | |
1049 | */ | |
1050 | key.offset = (u64)-1; | |
e02119d5 CM |
1051 | } |
1052 | btrfs_release_path(root, path); | |
1053 | return 0; | |
1054 | } | |
1055 | ||
1056 | ||
1057 | /* | |
1058 | * record a given inode in the fixup dir so we can check its link | |
1059 | * count when replay is done. The link count is incremented here | |
1060 | * so the inode won't go away until we check it | |
1061 | */ | |
1062 | static noinline int link_to_fixup_dir(struct btrfs_trans_handle *trans, | |
1063 | struct btrfs_root *root, | |
1064 | struct btrfs_path *path, | |
1065 | u64 objectid) | |
1066 | { | |
1067 | struct btrfs_key key; | |
1068 | int ret = 0; | |
1069 | struct inode *inode; | |
1070 | ||
1071 | inode = read_one_inode(root, objectid); | |
1072 | BUG_ON(!inode); | |
1073 | ||
1074 | key.objectid = BTRFS_TREE_LOG_FIXUP_OBJECTID; | |
1075 | btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY); | |
1076 | key.offset = objectid; | |
1077 | ||
1078 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
1079 | ||
1080 | btrfs_release_path(root, path); | |
1081 | if (ret == 0) { | |
1082 | btrfs_inc_nlink(inode); | |
1083 | btrfs_update_inode(trans, root, inode); | |
1084 | } else if (ret == -EEXIST) { | |
1085 | ret = 0; | |
1086 | } else { | |
1087 | BUG(); | |
1088 | } | |
1089 | iput(inode); | |
1090 | ||
1091 | return ret; | |
1092 | } | |
1093 | ||
1094 | /* | |
1095 | * when replaying the log for a directory, we only insert names | |
1096 | * for inodes that actually exist. This means an fsync on a directory | |
1097 | * does not implicitly fsync all the new files in it | |
1098 | */ | |
1099 | static noinline int insert_one_name(struct btrfs_trans_handle *trans, | |
1100 | struct btrfs_root *root, | |
1101 | struct btrfs_path *path, | |
1102 | u64 dirid, u64 index, | |
1103 | char *name, int name_len, u8 type, | |
1104 | struct btrfs_key *location) | |
1105 | { | |
1106 | struct inode *inode; | |
1107 | struct inode *dir; | |
1108 | int ret; | |
1109 | ||
1110 | inode = read_one_inode(root, location->objectid); | |
1111 | if (!inode) | |
1112 | return -ENOENT; | |
1113 | ||
1114 | dir = read_one_inode(root, dirid); | |
1115 | if (!dir) { | |
1116 | iput(inode); | |
1117 | return -EIO; | |
1118 | } | |
1119 | ret = btrfs_add_link(trans, dir, inode, name, name_len, 1, index); | |
1120 | ||
1121 | /* FIXME, put inode into FIXUP list */ | |
1122 | ||
1123 | iput(inode); | |
1124 | iput(dir); | |
1125 | return ret; | |
1126 | } | |
1127 | ||
1128 | /* | |
1129 | * take a single entry in a log directory item and replay it into | |
1130 | * the subvolume. | |
1131 | * | |
1132 | * if a conflicting item exists in the subdirectory already, | |
1133 | * the inode it points to is unlinked and put into the link count | |
1134 | * fix up tree. | |
1135 | * | |
1136 | * If a name from the log points to a file or directory that does | |
1137 | * not exist in the FS, it is skipped. fsyncs on directories | |
1138 | * do not force down inodes inside that directory, just changes to the | |
1139 | * names or unlinks in a directory. | |
1140 | */ | |
1141 | static noinline int replay_one_name(struct btrfs_trans_handle *trans, | |
1142 | struct btrfs_root *root, | |
1143 | struct btrfs_path *path, | |
1144 | struct extent_buffer *eb, | |
1145 | struct btrfs_dir_item *di, | |
1146 | struct btrfs_key *key) | |
1147 | { | |
1148 | char *name; | |
1149 | int name_len; | |
1150 | struct btrfs_dir_item *dst_di; | |
1151 | struct btrfs_key found_key; | |
1152 | struct btrfs_key log_key; | |
1153 | struct inode *dir; | |
e02119d5 | 1154 | u8 log_type; |
4bef0848 | 1155 | int exists; |
e02119d5 CM |
1156 | int ret; |
1157 | ||
1158 | dir = read_one_inode(root, key->objectid); | |
1159 | BUG_ON(!dir); | |
1160 | ||
1161 | name_len = btrfs_dir_name_len(eb, di); | |
1162 | name = kmalloc(name_len, GFP_NOFS); | |
1163 | log_type = btrfs_dir_type(eb, di); | |
1164 | read_extent_buffer(eb, name, (unsigned long)(di + 1), | |
1165 | name_len); | |
1166 | ||
1167 | btrfs_dir_item_key_to_cpu(eb, di, &log_key); | |
4bef0848 CM |
1168 | exists = btrfs_lookup_inode(trans, root, path, &log_key, 0); |
1169 | if (exists == 0) | |
1170 | exists = 1; | |
1171 | else | |
1172 | exists = 0; | |
1173 | btrfs_release_path(root, path); | |
1174 | ||
e02119d5 CM |
1175 | if (key->type == BTRFS_DIR_ITEM_KEY) { |
1176 | dst_di = btrfs_lookup_dir_item(trans, root, path, key->objectid, | |
1177 | name, name_len, 1); | |
d397712b | 1178 | } else if (key->type == BTRFS_DIR_INDEX_KEY) { |
e02119d5 CM |
1179 | dst_di = btrfs_lookup_dir_index_item(trans, root, path, |
1180 | key->objectid, | |
1181 | key->offset, name, | |
1182 | name_len, 1); | |
1183 | } else { | |
1184 | BUG(); | |
1185 | } | |
1186 | if (!dst_di || IS_ERR(dst_di)) { | |
1187 | /* we need a sequence number to insert, so we only | |
1188 | * do inserts for the BTRFS_DIR_INDEX_KEY types | |
1189 | */ | |
1190 | if (key->type != BTRFS_DIR_INDEX_KEY) | |
1191 | goto out; | |
1192 | goto insert; | |
1193 | } | |
1194 | ||
1195 | btrfs_dir_item_key_to_cpu(path->nodes[0], dst_di, &found_key); | |
1196 | /* the existing item matches the logged item */ | |
1197 | if (found_key.objectid == log_key.objectid && | |
1198 | found_key.type == log_key.type && | |
1199 | found_key.offset == log_key.offset && | |
1200 | btrfs_dir_type(path->nodes[0], dst_di) == log_type) { | |
1201 | goto out; | |
1202 | } | |
1203 | ||
1204 | /* | |
1205 | * don't drop the conflicting directory entry if the inode | |
1206 | * for the new entry doesn't exist | |
1207 | */ | |
4bef0848 | 1208 | if (!exists) |
e02119d5 CM |
1209 | goto out; |
1210 | ||
e02119d5 CM |
1211 | ret = drop_one_dir_item(trans, root, path, dir, dst_di); |
1212 | BUG_ON(ret); | |
1213 | ||
1214 | if (key->type == BTRFS_DIR_INDEX_KEY) | |
1215 | goto insert; | |
1216 | out: | |
1217 | btrfs_release_path(root, path); | |
1218 | kfree(name); | |
1219 | iput(dir); | |
1220 | return 0; | |
1221 | ||
1222 | insert: | |
1223 | btrfs_release_path(root, path); | |
1224 | ret = insert_one_name(trans, root, path, key->objectid, key->offset, | |
1225 | name, name_len, log_type, &log_key); | |
1226 | ||
1227 | if (ret && ret != -ENOENT) | |
1228 | BUG(); | |
1229 | goto out; | |
1230 | } | |
1231 | ||
1232 | /* | |
1233 | * find all the names in a directory item and reconcile them into | |
1234 | * the subvolume. Only BTRFS_DIR_ITEM_KEY types will have more than | |
1235 | * one name in a directory item, but the same code gets used for | |
1236 | * both directory index types | |
1237 | */ | |
1238 | static noinline int replay_one_dir_item(struct btrfs_trans_handle *trans, | |
1239 | struct btrfs_root *root, | |
1240 | struct btrfs_path *path, | |
1241 | struct extent_buffer *eb, int slot, | |
1242 | struct btrfs_key *key) | |
1243 | { | |
1244 | int ret; | |
1245 | u32 item_size = btrfs_item_size_nr(eb, slot); | |
1246 | struct btrfs_dir_item *di; | |
1247 | int name_len; | |
1248 | unsigned long ptr; | |
1249 | unsigned long ptr_end; | |
1250 | ||
1251 | ptr = btrfs_item_ptr_offset(eb, slot); | |
1252 | ptr_end = ptr + item_size; | |
d397712b | 1253 | while (ptr < ptr_end) { |
e02119d5 CM |
1254 | di = (struct btrfs_dir_item *)ptr; |
1255 | name_len = btrfs_dir_name_len(eb, di); | |
1256 | ret = replay_one_name(trans, root, path, eb, di, key); | |
1257 | BUG_ON(ret); | |
1258 | ptr = (unsigned long)(di + 1); | |
1259 | ptr += name_len; | |
1260 | } | |
1261 | return 0; | |
1262 | } | |
1263 | ||
1264 | /* | |
1265 | * directory replay has two parts. There are the standard directory | |
1266 | * items in the log copied from the subvolume, and range items | |
1267 | * created in the log while the subvolume was logged. | |
1268 | * | |
1269 | * The range items tell us which parts of the key space the log | |
1270 | * is authoritative for. During replay, if a key in the subvolume | |
1271 | * directory is in a logged range item, but not actually in the log | |
1272 | * that means it was deleted from the directory before the fsync | |
1273 | * and should be removed. | |
1274 | */ | |
1275 | static noinline int find_dir_range(struct btrfs_root *root, | |
1276 | struct btrfs_path *path, | |
1277 | u64 dirid, int key_type, | |
1278 | u64 *start_ret, u64 *end_ret) | |
1279 | { | |
1280 | struct btrfs_key key; | |
1281 | u64 found_end; | |
1282 | struct btrfs_dir_log_item *item; | |
1283 | int ret; | |
1284 | int nritems; | |
1285 | ||
1286 | if (*start_ret == (u64)-1) | |
1287 | return 1; | |
1288 | ||
1289 | key.objectid = dirid; | |
1290 | key.type = key_type; | |
1291 | key.offset = *start_ret; | |
1292 | ||
1293 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1294 | if (ret < 0) | |
1295 | goto out; | |
1296 | if (ret > 0) { | |
1297 | if (path->slots[0] == 0) | |
1298 | goto out; | |
1299 | path->slots[0]--; | |
1300 | } | |
1301 | if (ret != 0) | |
1302 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1303 | ||
1304 | if (key.type != key_type || key.objectid != dirid) { | |
1305 | ret = 1; | |
1306 | goto next; | |
1307 | } | |
1308 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1309 | struct btrfs_dir_log_item); | |
1310 | found_end = btrfs_dir_log_end(path->nodes[0], item); | |
1311 | ||
1312 | if (*start_ret >= key.offset && *start_ret <= found_end) { | |
1313 | ret = 0; | |
1314 | *start_ret = key.offset; | |
1315 | *end_ret = found_end; | |
1316 | goto out; | |
1317 | } | |
1318 | ret = 1; | |
1319 | next: | |
1320 | /* check the next slot in the tree to see if it is a valid item */ | |
1321 | nritems = btrfs_header_nritems(path->nodes[0]); | |
1322 | if (path->slots[0] >= nritems) { | |
1323 | ret = btrfs_next_leaf(root, path); | |
1324 | if (ret) | |
1325 | goto out; | |
1326 | } else { | |
1327 | path->slots[0]++; | |
1328 | } | |
1329 | ||
1330 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1331 | ||
1332 | if (key.type != key_type || key.objectid != dirid) { | |
1333 | ret = 1; | |
1334 | goto out; | |
1335 | } | |
1336 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1337 | struct btrfs_dir_log_item); | |
1338 | found_end = btrfs_dir_log_end(path->nodes[0], item); | |
1339 | *start_ret = key.offset; | |
1340 | *end_ret = found_end; | |
1341 | ret = 0; | |
1342 | out: | |
1343 | btrfs_release_path(root, path); | |
1344 | return ret; | |
1345 | } | |
1346 | ||
1347 | /* | |
1348 | * this looks for a given directory item in the log. If the directory | |
1349 | * item is not in the log, the item is removed and the inode it points | |
1350 | * to is unlinked | |
1351 | */ | |
1352 | static noinline int check_item_in_log(struct btrfs_trans_handle *trans, | |
1353 | struct btrfs_root *root, | |
1354 | struct btrfs_root *log, | |
1355 | struct btrfs_path *path, | |
1356 | struct btrfs_path *log_path, | |
1357 | struct inode *dir, | |
1358 | struct btrfs_key *dir_key) | |
1359 | { | |
1360 | int ret; | |
1361 | struct extent_buffer *eb; | |
1362 | int slot; | |
1363 | u32 item_size; | |
1364 | struct btrfs_dir_item *di; | |
1365 | struct btrfs_dir_item *log_di; | |
1366 | int name_len; | |
1367 | unsigned long ptr; | |
1368 | unsigned long ptr_end; | |
1369 | char *name; | |
1370 | struct inode *inode; | |
1371 | struct btrfs_key location; | |
1372 | ||
1373 | again: | |
1374 | eb = path->nodes[0]; | |
1375 | slot = path->slots[0]; | |
1376 | item_size = btrfs_item_size_nr(eb, slot); | |
1377 | ptr = btrfs_item_ptr_offset(eb, slot); | |
1378 | ptr_end = ptr + item_size; | |
d397712b | 1379 | while (ptr < ptr_end) { |
e02119d5 CM |
1380 | di = (struct btrfs_dir_item *)ptr; |
1381 | name_len = btrfs_dir_name_len(eb, di); | |
1382 | name = kmalloc(name_len, GFP_NOFS); | |
1383 | if (!name) { | |
1384 | ret = -ENOMEM; | |
1385 | goto out; | |
1386 | } | |
1387 | read_extent_buffer(eb, name, (unsigned long)(di + 1), | |
1388 | name_len); | |
1389 | log_di = NULL; | |
12fcfd22 | 1390 | if (log && dir_key->type == BTRFS_DIR_ITEM_KEY) { |
e02119d5 CM |
1391 | log_di = btrfs_lookup_dir_item(trans, log, log_path, |
1392 | dir_key->objectid, | |
1393 | name, name_len, 0); | |
12fcfd22 | 1394 | } else if (log && dir_key->type == BTRFS_DIR_INDEX_KEY) { |
e02119d5 CM |
1395 | log_di = btrfs_lookup_dir_index_item(trans, log, |
1396 | log_path, | |
1397 | dir_key->objectid, | |
1398 | dir_key->offset, | |
1399 | name, name_len, 0); | |
1400 | } | |
1401 | if (!log_di || IS_ERR(log_di)) { | |
1402 | btrfs_dir_item_key_to_cpu(eb, di, &location); | |
1403 | btrfs_release_path(root, path); | |
1404 | btrfs_release_path(log, log_path); | |
1405 | inode = read_one_inode(root, location.objectid); | |
1406 | BUG_ON(!inode); | |
1407 | ||
1408 | ret = link_to_fixup_dir(trans, root, | |
1409 | path, location.objectid); | |
1410 | BUG_ON(ret); | |
1411 | btrfs_inc_nlink(inode); | |
1412 | ret = btrfs_unlink_inode(trans, root, dir, inode, | |
1413 | name, name_len); | |
1414 | BUG_ON(ret); | |
1415 | kfree(name); | |
1416 | iput(inode); | |
1417 | ||
1418 | /* there might still be more names under this key | |
1419 | * check and repeat if required | |
1420 | */ | |
1421 | ret = btrfs_search_slot(NULL, root, dir_key, path, | |
1422 | 0, 0); | |
1423 | if (ret == 0) | |
1424 | goto again; | |
1425 | ret = 0; | |
1426 | goto out; | |
1427 | } | |
1428 | btrfs_release_path(log, log_path); | |
1429 | kfree(name); | |
1430 | ||
1431 | ptr = (unsigned long)(di + 1); | |
1432 | ptr += name_len; | |
1433 | } | |
1434 | ret = 0; | |
1435 | out: | |
1436 | btrfs_release_path(root, path); | |
1437 | btrfs_release_path(log, log_path); | |
1438 | return ret; | |
1439 | } | |
1440 | ||
1441 | /* | |
1442 | * deletion replay happens before we copy any new directory items | |
1443 | * out of the log or out of backreferences from inodes. It | |
1444 | * scans the log to find ranges of keys that log is authoritative for, | |
1445 | * and then scans the directory to find items in those ranges that are | |
1446 | * not present in the log. | |
1447 | * | |
1448 | * Anything we don't find in the log is unlinked and removed from the | |
1449 | * directory. | |
1450 | */ | |
1451 | static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, | |
1452 | struct btrfs_root *root, | |
1453 | struct btrfs_root *log, | |
1454 | struct btrfs_path *path, | |
12fcfd22 | 1455 | u64 dirid, int del_all) |
e02119d5 CM |
1456 | { |
1457 | u64 range_start; | |
1458 | u64 range_end; | |
1459 | int key_type = BTRFS_DIR_LOG_ITEM_KEY; | |
1460 | int ret = 0; | |
1461 | struct btrfs_key dir_key; | |
1462 | struct btrfs_key found_key; | |
1463 | struct btrfs_path *log_path; | |
1464 | struct inode *dir; | |
1465 | ||
1466 | dir_key.objectid = dirid; | |
1467 | dir_key.type = BTRFS_DIR_ITEM_KEY; | |
1468 | log_path = btrfs_alloc_path(); | |
1469 | if (!log_path) | |
1470 | return -ENOMEM; | |
1471 | ||
1472 | dir = read_one_inode(root, dirid); | |
1473 | /* it isn't an error if the inode isn't there, that can happen | |
1474 | * because we replay the deletes before we copy in the inode item | |
1475 | * from the log | |
1476 | */ | |
1477 | if (!dir) { | |
1478 | btrfs_free_path(log_path); | |
1479 | return 0; | |
1480 | } | |
1481 | again: | |
1482 | range_start = 0; | |
1483 | range_end = 0; | |
d397712b | 1484 | while (1) { |
12fcfd22 CM |
1485 | if (del_all) |
1486 | range_end = (u64)-1; | |
1487 | else { | |
1488 | ret = find_dir_range(log, path, dirid, key_type, | |
1489 | &range_start, &range_end); | |
1490 | if (ret != 0) | |
1491 | break; | |
1492 | } | |
e02119d5 CM |
1493 | |
1494 | dir_key.offset = range_start; | |
d397712b | 1495 | while (1) { |
e02119d5 CM |
1496 | int nritems; |
1497 | ret = btrfs_search_slot(NULL, root, &dir_key, path, | |
1498 | 0, 0); | |
1499 | if (ret < 0) | |
1500 | goto out; | |
1501 | ||
1502 | nritems = btrfs_header_nritems(path->nodes[0]); | |
1503 | if (path->slots[0] >= nritems) { | |
1504 | ret = btrfs_next_leaf(root, path); | |
1505 | if (ret) | |
1506 | break; | |
1507 | } | |
1508 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1509 | path->slots[0]); | |
1510 | if (found_key.objectid != dirid || | |
1511 | found_key.type != dir_key.type) | |
1512 | goto next_type; | |
1513 | ||
1514 | if (found_key.offset > range_end) | |
1515 | break; | |
1516 | ||
1517 | ret = check_item_in_log(trans, root, log, path, | |
12fcfd22 CM |
1518 | log_path, dir, |
1519 | &found_key); | |
e02119d5 CM |
1520 | BUG_ON(ret); |
1521 | if (found_key.offset == (u64)-1) | |
1522 | break; | |
1523 | dir_key.offset = found_key.offset + 1; | |
1524 | } | |
1525 | btrfs_release_path(root, path); | |
1526 | if (range_end == (u64)-1) | |
1527 | break; | |
1528 | range_start = range_end + 1; | |
1529 | } | |
1530 | ||
1531 | next_type: | |
1532 | ret = 0; | |
1533 | if (key_type == BTRFS_DIR_LOG_ITEM_KEY) { | |
1534 | key_type = BTRFS_DIR_LOG_INDEX_KEY; | |
1535 | dir_key.type = BTRFS_DIR_INDEX_KEY; | |
1536 | btrfs_release_path(root, path); | |
1537 | goto again; | |
1538 | } | |
1539 | out: | |
1540 | btrfs_release_path(root, path); | |
1541 | btrfs_free_path(log_path); | |
1542 | iput(dir); | |
1543 | return ret; | |
1544 | } | |
1545 | ||
1546 | /* | |
1547 | * the process_func used to replay items from the log tree. This | |
1548 | * gets called in two different stages. The first stage just looks | |
1549 | * for inodes and makes sure they are all copied into the subvolume. | |
1550 | * | |
1551 | * The second stage copies all the other item types from the log into | |
1552 | * the subvolume. The two stage approach is slower, but gets rid of | |
1553 | * lots of complexity around inodes referencing other inodes that exist | |
1554 | * only in the log (references come from either directory items or inode | |
1555 | * back refs). | |
1556 | */ | |
1557 | static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb, | |
1558 | struct walk_control *wc, u64 gen) | |
1559 | { | |
1560 | int nritems; | |
1561 | struct btrfs_path *path; | |
1562 | struct btrfs_root *root = wc->replay_dest; | |
1563 | struct btrfs_key key; | |
1564 | u32 item_size; | |
1565 | int level; | |
1566 | int i; | |
1567 | int ret; | |
1568 | ||
1569 | btrfs_read_buffer(eb, gen); | |
1570 | ||
1571 | level = btrfs_header_level(eb); | |
1572 | ||
1573 | if (level != 0) | |
1574 | return 0; | |
1575 | ||
1576 | path = btrfs_alloc_path(); | |
1577 | BUG_ON(!path); | |
1578 | ||
1579 | nritems = btrfs_header_nritems(eb); | |
1580 | for (i = 0; i < nritems; i++) { | |
1581 | btrfs_item_key_to_cpu(eb, &key, i); | |
1582 | item_size = btrfs_item_size_nr(eb, i); | |
1583 | ||
1584 | /* inode keys are done during the first stage */ | |
1585 | if (key.type == BTRFS_INODE_ITEM_KEY && | |
1586 | wc->stage == LOG_WALK_REPLAY_INODES) { | |
1587 | struct inode *inode; | |
1588 | struct btrfs_inode_item *inode_item; | |
1589 | u32 mode; | |
1590 | ||
1591 | inode_item = btrfs_item_ptr(eb, i, | |
1592 | struct btrfs_inode_item); | |
1593 | mode = btrfs_inode_mode(eb, inode_item); | |
1594 | if (S_ISDIR(mode)) { | |
1595 | ret = replay_dir_deletes(wc->trans, | |
12fcfd22 | 1596 | root, log, path, key.objectid, 0); |
e02119d5 CM |
1597 | BUG_ON(ret); |
1598 | } | |
1599 | ret = overwrite_item(wc->trans, root, path, | |
1600 | eb, i, &key); | |
1601 | BUG_ON(ret); | |
1602 | ||
1603 | /* for regular files, truncate away | |
1604 | * extents past the new EOF | |
1605 | */ | |
1606 | if (S_ISREG(mode)) { | |
1607 | inode = read_one_inode(root, | |
1608 | key.objectid); | |
1609 | BUG_ON(!inode); | |
1610 | ||
1611 | ret = btrfs_truncate_inode_items(wc->trans, | |
1612 | root, inode, inode->i_size, | |
1613 | BTRFS_EXTENT_DATA_KEY); | |
1614 | BUG_ON(ret); | |
a74ac322 CM |
1615 | |
1616 | /* if the nlink count is zero here, the iput | |
1617 | * will free the inode. We bump it to make | |
1618 | * sure it doesn't get freed until the link | |
1619 | * count fixup is done | |
1620 | */ | |
1621 | if (inode->i_nlink == 0) { | |
1622 | btrfs_inc_nlink(inode); | |
1623 | btrfs_update_inode(wc->trans, | |
1624 | root, inode); | |
1625 | } | |
e02119d5 CM |
1626 | iput(inode); |
1627 | } | |
1628 | ret = link_to_fixup_dir(wc->trans, root, | |
1629 | path, key.objectid); | |
1630 | BUG_ON(ret); | |
1631 | } | |
1632 | if (wc->stage < LOG_WALK_REPLAY_ALL) | |
1633 | continue; | |
1634 | ||
1635 | /* these keys are simply copied */ | |
1636 | if (key.type == BTRFS_XATTR_ITEM_KEY) { | |
1637 | ret = overwrite_item(wc->trans, root, path, | |
1638 | eb, i, &key); | |
1639 | BUG_ON(ret); | |
1640 | } else if (key.type == BTRFS_INODE_REF_KEY) { | |
1641 | ret = add_inode_ref(wc->trans, root, log, path, | |
1642 | eb, i, &key); | |
1643 | BUG_ON(ret && ret != -ENOENT); | |
1644 | } else if (key.type == BTRFS_EXTENT_DATA_KEY) { | |
1645 | ret = replay_one_extent(wc->trans, root, path, | |
1646 | eb, i, &key); | |
1647 | BUG_ON(ret); | |
e02119d5 CM |
1648 | } else if (key.type == BTRFS_DIR_ITEM_KEY || |
1649 | key.type == BTRFS_DIR_INDEX_KEY) { | |
1650 | ret = replay_one_dir_item(wc->trans, root, path, | |
1651 | eb, i, &key); | |
1652 | BUG_ON(ret); | |
1653 | } | |
1654 | } | |
1655 | btrfs_free_path(path); | |
1656 | return 0; | |
1657 | } | |
1658 | ||
d397712b | 1659 | static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans, |
e02119d5 CM |
1660 | struct btrfs_root *root, |
1661 | struct btrfs_path *path, int *level, | |
1662 | struct walk_control *wc) | |
1663 | { | |
1664 | u64 root_owner; | |
1665 | u64 root_gen; | |
1666 | u64 bytenr; | |
1667 | u64 ptr_gen; | |
1668 | struct extent_buffer *next; | |
1669 | struct extent_buffer *cur; | |
1670 | struct extent_buffer *parent; | |
1671 | u32 blocksize; | |
1672 | int ret = 0; | |
1673 | ||
1674 | WARN_ON(*level < 0); | |
1675 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
1676 | ||
d397712b | 1677 | while (*level > 0) { |
e02119d5 CM |
1678 | WARN_ON(*level < 0); |
1679 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
1680 | cur = path->nodes[*level]; | |
1681 | ||
1682 | if (btrfs_header_level(cur) != *level) | |
1683 | WARN_ON(1); | |
1684 | ||
1685 | if (path->slots[*level] >= | |
1686 | btrfs_header_nritems(cur)) | |
1687 | break; | |
1688 | ||
1689 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); | |
1690 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); | |
1691 | blocksize = btrfs_level_size(root, *level - 1); | |
1692 | ||
1693 | parent = path->nodes[*level]; | |
1694 | root_owner = btrfs_header_owner(parent); | |
1695 | root_gen = btrfs_header_generation(parent); | |
1696 | ||
1697 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
1698 | ||
1699 | wc->process_func(root, next, wc, ptr_gen); | |
1700 | ||
1701 | if (*level == 1) { | |
1702 | path->slots[*level]++; | |
1703 | if (wc->free) { | |
1704 | btrfs_read_buffer(next, ptr_gen); | |
1705 | ||
1706 | btrfs_tree_lock(next); | |
1707 | clean_tree_block(trans, root, next); | |
b4ce94de | 1708 | btrfs_set_lock_blocking(next); |
e02119d5 CM |
1709 | btrfs_wait_tree_block_writeback(next); |
1710 | btrfs_tree_unlock(next); | |
1711 | ||
1712 | ret = btrfs_drop_leaf_ref(trans, root, next); | |
1713 | BUG_ON(ret); | |
1714 | ||
1715 | WARN_ON(root_owner != | |
1716 | BTRFS_TREE_LOG_OBJECTID); | |
d00aff00 CM |
1717 | ret = btrfs_free_reserved_extent(root, |
1718 | bytenr, blocksize); | |
e02119d5 CM |
1719 | BUG_ON(ret); |
1720 | } | |
1721 | free_extent_buffer(next); | |
1722 | continue; | |
1723 | } | |
1724 | btrfs_read_buffer(next, ptr_gen); | |
1725 | ||
1726 | WARN_ON(*level <= 0); | |
1727 | if (path->nodes[*level-1]) | |
1728 | free_extent_buffer(path->nodes[*level-1]); | |
1729 | path->nodes[*level-1] = next; | |
1730 | *level = btrfs_header_level(next); | |
1731 | path->slots[*level] = 0; | |
1732 | cond_resched(); | |
1733 | } | |
1734 | WARN_ON(*level < 0); | |
1735 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
1736 | ||
d397712b | 1737 | if (path->nodes[*level] == root->node) |
e02119d5 | 1738 | parent = path->nodes[*level]; |
d397712b | 1739 | else |
e02119d5 | 1740 | parent = path->nodes[*level + 1]; |
d397712b | 1741 | |
e02119d5 CM |
1742 | bytenr = path->nodes[*level]->start; |
1743 | ||
1744 | blocksize = btrfs_level_size(root, *level); | |
1745 | root_owner = btrfs_header_owner(parent); | |
1746 | root_gen = btrfs_header_generation(parent); | |
1747 | ||
1748 | wc->process_func(root, path->nodes[*level], wc, | |
1749 | btrfs_header_generation(path->nodes[*level])); | |
1750 | ||
1751 | if (wc->free) { | |
1752 | next = path->nodes[*level]; | |
1753 | btrfs_tree_lock(next); | |
1754 | clean_tree_block(trans, root, next); | |
b4ce94de | 1755 | btrfs_set_lock_blocking(next); |
e02119d5 CM |
1756 | btrfs_wait_tree_block_writeback(next); |
1757 | btrfs_tree_unlock(next); | |
1758 | ||
1759 | if (*level == 0) { | |
1760 | ret = btrfs_drop_leaf_ref(trans, root, next); | |
1761 | BUG_ON(ret); | |
1762 | } | |
1763 | WARN_ON(root_owner != BTRFS_TREE_LOG_OBJECTID); | |
d00aff00 | 1764 | ret = btrfs_free_reserved_extent(root, bytenr, blocksize); |
e02119d5 CM |
1765 | BUG_ON(ret); |
1766 | } | |
1767 | free_extent_buffer(path->nodes[*level]); | |
1768 | path->nodes[*level] = NULL; | |
1769 | *level += 1; | |
1770 | ||
1771 | cond_resched(); | |
1772 | return 0; | |
1773 | } | |
1774 | ||
d397712b | 1775 | static noinline int walk_up_log_tree(struct btrfs_trans_handle *trans, |
e02119d5 CM |
1776 | struct btrfs_root *root, |
1777 | struct btrfs_path *path, int *level, | |
1778 | struct walk_control *wc) | |
1779 | { | |
1780 | u64 root_owner; | |
1781 | u64 root_gen; | |
1782 | int i; | |
1783 | int slot; | |
1784 | int ret; | |
1785 | ||
d397712b | 1786 | for (i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { |
e02119d5 CM |
1787 | slot = path->slots[i]; |
1788 | if (slot < btrfs_header_nritems(path->nodes[i]) - 1) { | |
1789 | struct extent_buffer *node; | |
1790 | node = path->nodes[i]; | |
1791 | path->slots[i]++; | |
1792 | *level = i; | |
1793 | WARN_ON(*level == 0); | |
1794 | return 0; | |
1795 | } else { | |
31840ae1 ZY |
1796 | struct extent_buffer *parent; |
1797 | if (path->nodes[*level] == root->node) | |
1798 | parent = path->nodes[*level]; | |
1799 | else | |
1800 | parent = path->nodes[*level + 1]; | |
1801 | ||
1802 | root_owner = btrfs_header_owner(parent); | |
1803 | root_gen = btrfs_header_generation(parent); | |
e02119d5 CM |
1804 | wc->process_func(root, path->nodes[*level], wc, |
1805 | btrfs_header_generation(path->nodes[*level])); | |
1806 | if (wc->free) { | |
1807 | struct extent_buffer *next; | |
1808 | ||
1809 | next = path->nodes[*level]; | |
1810 | ||
1811 | btrfs_tree_lock(next); | |
1812 | clean_tree_block(trans, root, next); | |
b4ce94de | 1813 | btrfs_set_lock_blocking(next); |
e02119d5 CM |
1814 | btrfs_wait_tree_block_writeback(next); |
1815 | btrfs_tree_unlock(next); | |
1816 | ||
1817 | if (*level == 0) { | |
1818 | ret = btrfs_drop_leaf_ref(trans, root, | |
1819 | next); | |
1820 | BUG_ON(ret); | |
1821 | } | |
1822 | ||
1823 | WARN_ON(root_owner != BTRFS_TREE_LOG_OBJECTID); | |
d00aff00 | 1824 | ret = btrfs_free_reserved_extent(root, |
e02119d5 | 1825 | path->nodes[*level]->start, |
d00aff00 | 1826 | path->nodes[*level]->len); |
e02119d5 CM |
1827 | BUG_ON(ret); |
1828 | } | |
1829 | free_extent_buffer(path->nodes[*level]); | |
1830 | path->nodes[*level] = NULL; | |
1831 | *level = i + 1; | |
1832 | } | |
1833 | } | |
1834 | return 1; | |
1835 | } | |
1836 | ||
1837 | /* | |
1838 | * drop the reference count on the tree rooted at 'snap'. This traverses | |
1839 | * the tree freeing any blocks that have a ref count of zero after being | |
1840 | * decremented. | |
1841 | */ | |
1842 | static int walk_log_tree(struct btrfs_trans_handle *trans, | |
1843 | struct btrfs_root *log, struct walk_control *wc) | |
1844 | { | |
1845 | int ret = 0; | |
1846 | int wret; | |
1847 | int level; | |
1848 | struct btrfs_path *path; | |
1849 | int i; | |
1850 | int orig_level; | |
1851 | ||
1852 | path = btrfs_alloc_path(); | |
1853 | BUG_ON(!path); | |
1854 | ||
1855 | level = btrfs_header_level(log->node); | |
1856 | orig_level = level; | |
1857 | path->nodes[level] = log->node; | |
1858 | extent_buffer_get(log->node); | |
1859 | path->slots[level] = 0; | |
1860 | ||
d397712b | 1861 | while (1) { |
e02119d5 CM |
1862 | wret = walk_down_log_tree(trans, log, path, &level, wc); |
1863 | if (wret > 0) | |
1864 | break; | |
1865 | if (wret < 0) | |
1866 | ret = wret; | |
1867 | ||
1868 | wret = walk_up_log_tree(trans, log, path, &level, wc); | |
1869 | if (wret > 0) | |
1870 | break; | |
1871 | if (wret < 0) | |
1872 | ret = wret; | |
1873 | } | |
1874 | ||
1875 | /* was the root node processed? if not, catch it here */ | |
1876 | if (path->nodes[orig_level]) { | |
1877 | wc->process_func(log, path->nodes[orig_level], wc, | |
1878 | btrfs_header_generation(path->nodes[orig_level])); | |
1879 | if (wc->free) { | |
1880 | struct extent_buffer *next; | |
1881 | ||
1882 | next = path->nodes[orig_level]; | |
1883 | ||
1884 | btrfs_tree_lock(next); | |
1885 | clean_tree_block(trans, log, next); | |
b4ce94de | 1886 | btrfs_set_lock_blocking(next); |
e02119d5 CM |
1887 | btrfs_wait_tree_block_writeback(next); |
1888 | btrfs_tree_unlock(next); | |
1889 | ||
1890 | if (orig_level == 0) { | |
1891 | ret = btrfs_drop_leaf_ref(trans, log, | |
1892 | next); | |
1893 | BUG_ON(ret); | |
1894 | } | |
1895 | WARN_ON(log->root_key.objectid != | |
1896 | BTRFS_TREE_LOG_OBJECTID); | |
d00aff00 CM |
1897 | ret = btrfs_free_reserved_extent(log, next->start, |
1898 | next->len); | |
e02119d5 CM |
1899 | BUG_ON(ret); |
1900 | } | |
1901 | } | |
1902 | ||
1903 | for (i = 0; i <= orig_level; i++) { | |
1904 | if (path->nodes[i]) { | |
1905 | free_extent_buffer(path->nodes[i]); | |
1906 | path->nodes[i] = NULL; | |
1907 | } | |
1908 | } | |
1909 | btrfs_free_path(path); | |
e02119d5 CM |
1910 | return ret; |
1911 | } | |
1912 | ||
7237f183 YZ |
1913 | /* |
1914 | * helper function to update the item for a given subvolumes log root | |
1915 | * in the tree of log roots | |
1916 | */ | |
1917 | static int update_log_root(struct btrfs_trans_handle *trans, | |
1918 | struct btrfs_root *log) | |
1919 | { | |
1920 | int ret; | |
1921 | ||
1922 | if (log->log_transid == 1) { | |
1923 | /* insert root item on the first sync */ | |
1924 | ret = btrfs_insert_root(trans, log->fs_info->log_root_tree, | |
1925 | &log->root_key, &log->root_item); | |
1926 | } else { | |
1927 | ret = btrfs_update_root(trans, log->fs_info->log_root_tree, | |
1928 | &log->root_key, &log->root_item); | |
1929 | } | |
1930 | return ret; | |
1931 | } | |
1932 | ||
12fcfd22 CM |
1933 | static int wait_log_commit(struct btrfs_trans_handle *trans, |
1934 | struct btrfs_root *root, unsigned long transid) | |
e02119d5 CM |
1935 | { |
1936 | DEFINE_WAIT(wait); | |
7237f183 | 1937 | int index = transid % 2; |
e02119d5 | 1938 | |
7237f183 YZ |
1939 | /* |
1940 | * we only allow two pending log transactions at a time, | |
1941 | * so we know that if ours is more than 2 older than the | |
1942 | * current transaction, we're done | |
1943 | */ | |
e02119d5 | 1944 | do { |
7237f183 YZ |
1945 | prepare_to_wait(&root->log_commit_wait[index], |
1946 | &wait, TASK_UNINTERRUPTIBLE); | |
1947 | mutex_unlock(&root->log_mutex); | |
12fcfd22 CM |
1948 | |
1949 | if (root->fs_info->last_trans_log_full_commit != | |
1950 | trans->transid && root->log_transid < transid + 2 && | |
7237f183 YZ |
1951 | atomic_read(&root->log_commit[index])) |
1952 | schedule(); | |
12fcfd22 | 1953 | |
7237f183 YZ |
1954 | finish_wait(&root->log_commit_wait[index], &wait); |
1955 | mutex_lock(&root->log_mutex); | |
1956 | } while (root->log_transid < transid + 2 && | |
1957 | atomic_read(&root->log_commit[index])); | |
1958 | return 0; | |
1959 | } | |
1960 | ||
12fcfd22 CM |
1961 | static int wait_for_writer(struct btrfs_trans_handle *trans, |
1962 | struct btrfs_root *root) | |
7237f183 YZ |
1963 | { |
1964 | DEFINE_WAIT(wait); | |
1965 | while (atomic_read(&root->log_writers)) { | |
1966 | prepare_to_wait(&root->log_writer_wait, | |
1967 | &wait, TASK_UNINTERRUPTIBLE); | |
1968 | mutex_unlock(&root->log_mutex); | |
12fcfd22 CM |
1969 | if (root->fs_info->last_trans_log_full_commit != |
1970 | trans->transid && atomic_read(&root->log_writers)) | |
e02119d5 | 1971 | schedule(); |
7237f183 YZ |
1972 | mutex_lock(&root->log_mutex); |
1973 | finish_wait(&root->log_writer_wait, &wait); | |
1974 | } | |
e02119d5 CM |
1975 | return 0; |
1976 | } | |
1977 | ||
1978 | /* | |
1979 | * btrfs_sync_log does sends a given tree log down to the disk and | |
1980 | * updates the super blocks to record it. When this call is done, | |
12fcfd22 CM |
1981 | * you know that any inodes previously logged are safely on disk only |
1982 | * if it returns 0. | |
1983 | * | |
1984 | * Any other return value means you need to call btrfs_commit_transaction. | |
1985 | * Some of the edge cases for fsyncing directories that have had unlinks | |
1986 | * or renames done in the past mean that sometimes the only safe | |
1987 | * fsync is to commit the whole FS. When btrfs_sync_log returns -EAGAIN, | |
1988 | * that has happened. | |
e02119d5 CM |
1989 | */ |
1990 | int btrfs_sync_log(struct btrfs_trans_handle *trans, | |
1991 | struct btrfs_root *root) | |
1992 | { | |
7237f183 YZ |
1993 | int index1; |
1994 | int index2; | |
e02119d5 | 1995 | int ret; |
e02119d5 | 1996 | struct btrfs_root *log = root->log_root; |
7237f183 | 1997 | struct btrfs_root *log_root_tree = root->fs_info->log_root_tree; |
e02119d5 | 1998 | |
7237f183 YZ |
1999 | mutex_lock(&root->log_mutex); |
2000 | index1 = root->log_transid % 2; | |
2001 | if (atomic_read(&root->log_commit[index1])) { | |
12fcfd22 | 2002 | wait_log_commit(trans, root, root->log_transid); |
7237f183 YZ |
2003 | mutex_unlock(&root->log_mutex); |
2004 | return 0; | |
e02119d5 | 2005 | } |
7237f183 YZ |
2006 | atomic_set(&root->log_commit[index1], 1); |
2007 | ||
2008 | /* wait for previous tree log sync to complete */ | |
2009 | if (atomic_read(&root->log_commit[(index1 + 1) % 2])) | |
12fcfd22 | 2010 | wait_log_commit(trans, root, root->log_transid - 1); |
e02119d5 | 2011 | |
d397712b | 2012 | while (1) { |
7237f183 YZ |
2013 | unsigned long batch = root->log_batch; |
2014 | mutex_unlock(&root->log_mutex); | |
e02119d5 | 2015 | schedule_timeout_uninterruptible(1); |
7237f183 | 2016 | mutex_lock(&root->log_mutex); |
12fcfd22 CM |
2017 | |
2018 | wait_for_writer(trans, root); | |
7237f183 | 2019 | if (batch == root->log_batch) |
e02119d5 CM |
2020 | break; |
2021 | } | |
e02119d5 | 2022 | |
12fcfd22 CM |
2023 | /* bail out if we need to do a full commit */ |
2024 | if (root->fs_info->last_trans_log_full_commit == trans->transid) { | |
2025 | ret = -EAGAIN; | |
2026 | mutex_unlock(&root->log_mutex); | |
2027 | goto out; | |
2028 | } | |
2029 | ||
d0c803c4 | 2030 | ret = btrfs_write_and_wait_marked_extents(log, &log->dirty_log_pages); |
e02119d5 | 2031 | BUG_ON(ret); |
7237f183 YZ |
2032 | |
2033 | btrfs_set_root_bytenr(&log->root_item, log->node->start); | |
2034 | btrfs_set_root_generation(&log->root_item, trans->transid); | |
2035 | btrfs_set_root_level(&log->root_item, btrfs_header_level(log->node)); | |
2036 | ||
2037 | root->log_batch = 0; | |
2038 | root->log_transid++; | |
2039 | log->log_transid = root->log_transid; | |
2040 | smp_mb(); | |
2041 | /* | |
2042 | * log tree has been flushed to disk, new modifications of | |
2043 | * the log will be written to new positions. so it's safe to | |
2044 | * allow log writers to go in. | |
2045 | */ | |
2046 | mutex_unlock(&root->log_mutex); | |
2047 | ||
2048 | mutex_lock(&log_root_tree->log_mutex); | |
2049 | log_root_tree->log_batch++; | |
2050 | atomic_inc(&log_root_tree->log_writers); | |
2051 | mutex_unlock(&log_root_tree->log_mutex); | |
2052 | ||
2053 | ret = update_log_root(trans, log); | |
2054 | BUG_ON(ret); | |
2055 | ||
2056 | mutex_lock(&log_root_tree->log_mutex); | |
2057 | if (atomic_dec_and_test(&log_root_tree->log_writers)) { | |
2058 | smp_mb(); | |
2059 | if (waitqueue_active(&log_root_tree->log_writer_wait)) | |
2060 | wake_up(&log_root_tree->log_writer_wait); | |
2061 | } | |
2062 | ||
2063 | index2 = log_root_tree->log_transid % 2; | |
2064 | if (atomic_read(&log_root_tree->log_commit[index2])) { | |
12fcfd22 CM |
2065 | wait_log_commit(trans, log_root_tree, |
2066 | log_root_tree->log_transid); | |
7237f183 YZ |
2067 | mutex_unlock(&log_root_tree->log_mutex); |
2068 | goto out; | |
2069 | } | |
2070 | atomic_set(&log_root_tree->log_commit[index2], 1); | |
2071 | ||
12fcfd22 CM |
2072 | if (atomic_read(&log_root_tree->log_commit[(index2 + 1) % 2])) { |
2073 | wait_log_commit(trans, log_root_tree, | |
2074 | log_root_tree->log_transid - 1); | |
2075 | } | |
2076 | ||
2077 | wait_for_writer(trans, log_root_tree); | |
7237f183 | 2078 | |
12fcfd22 CM |
2079 | /* |
2080 | * now that we've moved on to the tree of log tree roots, | |
2081 | * check the full commit flag again | |
2082 | */ | |
2083 | if (root->fs_info->last_trans_log_full_commit == trans->transid) { | |
2084 | mutex_unlock(&log_root_tree->log_mutex); | |
2085 | ret = -EAGAIN; | |
2086 | goto out_wake_log_root; | |
2087 | } | |
7237f183 YZ |
2088 | |
2089 | ret = btrfs_write_and_wait_marked_extents(log_root_tree, | |
2090 | &log_root_tree->dirty_log_pages); | |
e02119d5 CM |
2091 | BUG_ON(ret); |
2092 | ||
2093 | btrfs_set_super_log_root(&root->fs_info->super_for_commit, | |
7237f183 | 2094 | log_root_tree->node->start); |
e02119d5 | 2095 | btrfs_set_super_log_root_level(&root->fs_info->super_for_commit, |
7237f183 | 2096 | btrfs_header_level(log_root_tree->node)); |
e02119d5 | 2097 | |
7237f183 YZ |
2098 | log_root_tree->log_batch = 0; |
2099 | log_root_tree->log_transid++; | |
e02119d5 | 2100 | smp_mb(); |
7237f183 YZ |
2101 | |
2102 | mutex_unlock(&log_root_tree->log_mutex); | |
2103 | ||
2104 | /* | |
2105 | * nobody else is going to jump in and write the the ctree | |
2106 | * super here because the log_commit atomic below is protecting | |
2107 | * us. We must be called with a transaction handle pinning | |
2108 | * the running transaction open, so a full commit can't hop | |
2109 | * in and cause problems either. | |
2110 | */ | |
2111 | write_ctree_super(trans, root->fs_info->tree_root, 2); | |
12fcfd22 | 2112 | ret = 0; |
7237f183 | 2113 | |
12fcfd22 | 2114 | out_wake_log_root: |
7237f183 YZ |
2115 | atomic_set(&log_root_tree->log_commit[index2], 0); |
2116 | smp_mb(); | |
2117 | if (waitqueue_active(&log_root_tree->log_commit_wait[index2])) | |
2118 | wake_up(&log_root_tree->log_commit_wait[index2]); | |
e02119d5 | 2119 | out: |
7237f183 YZ |
2120 | atomic_set(&root->log_commit[index1], 0); |
2121 | smp_mb(); | |
2122 | if (waitqueue_active(&root->log_commit_wait[index1])) | |
2123 | wake_up(&root->log_commit_wait[index1]); | |
e02119d5 | 2124 | return 0; |
e02119d5 CM |
2125 | } |
2126 | ||
12fcfd22 CM |
2127 | /* |
2128 | * free all the extents used by the tree log. This should be called | |
e02119d5 CM |
2129 | * at commit time of the full transaction |
2130 | */ | |
2131 | int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root) | |
2132 | { | |
2133 | int ret; | |
2134 | struct btrfs_root *log; | |
2135 | struct key; | |
d0c803c4 CM |
2136 | u64 start; |
2137 | u64 end; | |
e02119d5 CM |
2138 | struct walk_control wc = { |
2139 | .free = 1, | |
2140 | .process_func = process_one_buffer | |
2141 | }; | |
2142 | ||
07d400a6 | 2143 | if (!root->log_root || root->fs_info->log_root_recovering) |
e02119d5 CM |
2144 | return 0; |
2145 | ||
2146 | log = root->log_root; | |
2147 | ret = walk_log_tree(trans, log, &wc); | |
2148 | BUG_ON(ret); | |
2149 | ||
d397712b | 2150 | while (1) { |
d0c803c4 CM |
2151 | ret = find_first_extent_bit(&log->dirty_log_pages, |
2152 | 0, &start, &end, EXTENT_DIRTY); | |
2153 | if (ret) | |
2154 | break; | |
2155 | ||
2156 | clear_extent_dirty(&log->dirty_log_pages, | |
2157 | start, end, GFP_NOFS); | |
2158 | } | |
2159 | ||
7237f183 YZ |
2160 | if (log->log_transid > 0) { |
2161 | ret = btrfs_del_root(trans, root->fs_info->log_root_tree, | |
2162 | &log->root_key); | |
2163 | BUG_ON(ret); | |
2164 | } | |
e02119d5 | 2165 | root->log_root = NULL; |
7237f183 YZ |
2166 | free_extent_buffer(log->node); |
2167 | kfree(log); | |
e02119d5 CM |
2168 | return 0; |
2169 | } | |
2170 | ||
e02119d5 CM |
2171 | /* |
2172 | * If both a file and directory are logged, and unlinks or renames are | |
2173 | * mixed in, we have a few interesting corners: | |
2174 | * | |
2175 | * create file X in dir Y | |
2176 | * link file X to X.link in dir Y | |
2177 | * fsync file X | |
2178 | * unlink file X but leave X.link | |
2179 | * fsync dir Y | |
2180 | * | |
2181 | * After a crash we would expect only X.link to exist. But file X | |
2182 | * didn't get fsync'd again so the log has back refs for X and X.link. | |
2183 | * | |
2184 | * We solve this by removing directory entries and inode backrefs from the | |
2185 | * log when a file that was logged in the current transaction is | |
2186 | * unlinked. Any later fsync will include the updated log entries, and | |
2187 | * we'll be able to reconstruct the proper directory items from backrefs. | |
2188 | * | |
2189 | * This optimizations allows us to avoid relogging the entire inode | |
2190 | * or the entire directory. | |
2191 | */ | |
2192 | int btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans, | |
2193 | struct btrfs_root *root, | |
2194 | const char *name, int name_len, | |
2195 | struct inode *dir, u64 index) | |
2196 | { | |
2197 | struct btrfs_root *log; | |
2198 | struct btrfs_dir_item *di; | |
2199 | struct btrfs_path *path; | |
2200 | int ret; | |
2201 | int bytes_del = 0; | |
2202 | ||
3a5f1d45 CM |
2203 | if (BTRFS_I(dir)->logged_trans < trans->transid) |
2204 | return 0; | |
2205 | ||
e02119d5 CM |
2206 | ret = join_running_log_trans(root); |
2207 | if (ret) | |
2208 | return 0; | |
2209 | ||
2210 | mutex_lock(&BTRFS_I(dir)->log_mutex); | |
2211 | ||
2212 | log = root->log_root; | |
2213 | path = btrfs_alloc_path(); | |
2214 | di = btrfs_lookup_dir_item(trans, log, path, dir->i_ino, | |
2215 | name, name_len, -1); | |
2216 | if (di && !IS_ERR(di)) { | |
2217 | ret = btrfs_delete_one_dir_name(trans, log, path, di); | |
2218 | bytes_del += name_len; | |
2219 | BUG_ON(ret); | |
2220 | } | |
2221 | btrfs_release_path(log, path); | |
2222 | di = btrfs_lookup_dir_index_item(trans, log, path, dir->i_ino, | |
2223 | index, name, name_len, -1); | |
2224 | if (di && !IS_ERR(di)) { | |
2225 | ret = btrfs_delete_one_dir_name(trans, log, path, di); | |
2226 | bytes_del += name_len; | |
2227 | BUG_ON(ret); | |
2228 | } | |
2229 | ||
2230 | /* update the directory size in the log to reflect the names | |
2231 | * we have removed | |
2232 | */ | |
2233 | if (bytes_del) { | |
2234 | struct btrfs_key key; | |
2235 | ||
2236 | key.objectid = dir->i_ino; | |
2237 | key.offset = 0; | |
2238 | key.type = BTRFS_INODE_ITEM_KEY; | |
2239 | btrfs_release_path(log, path); | |
2240 | ||
2241 | ret = btrfs_search_slot(trans, log, &key, path, 0, 1); | |
2242 | if (ret == 0) { | |
2243 | struct btrfs_inode_item *item; | |
2244 | u64 i_size; | |
2245 | ||
2246 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
2247 | struct btrfs_inode_item); | |
2248 | i_size = btrfs_inode_size(path->nodes[0], item); | |
2249 | if (i_size > bytes_del) | |
2250 | i_size -= bytes_del; | |
2251 | else | |
2252 | i_size = 0; | |
2253 | btrfs_set_inode_size(path->nodes[0], item, i_size); | |
2254 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2255 | } else | |
2256 | ret = 0; | |
2257 | btrfs_release_path(log, path); | |
2258 | } | |
2259 | ||
2260 | btrfs_free_path(path); | |
2261 | mutex_unlock(&BTRFS_I(dir)->log_mutex); | |
12fcfd22 | 2262 | btrfs_end_log_trans(root); |
e02119d5 CM |
2263 | |
2264 | return 0; | |
2265 | } | |
2266 | ||
2267 | /* see comments for btrfs_del_dir_entries_in_log */ | |
2268 | int btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans, | |
2269 | struct btrfs_root *root, | |
2270 | const char *name, int name_len, | |
2271 | struct inode *inode, u64 dirid) | |
2272 | { | |
2273 | struct btrfs_root *log; | |
2274 | u64 index; | |
2275 | int ret; | |
2276 | ||
3a5f1d45 CM |
2277 | if (BTRFS_I(inode)->logged_trans < trans->transid) |
2278 | return 0; | |
2279 | ||
e02119d5 CM |
2280 | ret = join_running_log_trans(root); |
2281 | if (ret) | |
2282 | return 0; | |
2283 | log = root->log_root; | |
2284 | mutex_lock(&BTRFS_I(inode)->log_mutex); | |
2285 | ||
2286 | ret = btrfs_del_inode_ref(trans, log, name, name_len, inode->i_ino, | |
2287 | dirid, &index); | |
2288 | mutex_unlock(&BTRFS_I(inode)->log_mutex); | |
12fcfd22 | 2289 | btrfs_end_log_trans(root); |
e02119d5 | 2290 | |
e02119d5 CM |
2291 | return ret; |
2292 | } | |
2293 | ||
2294 | /* | |
2295 | * creates a range item in the log for 'dirid'. first_offset and | |
2296 | * last_offset tell us which parts of the key space the log should | |
2297 | * be considered authoritative for. | |
2298 | */ | |
2299 | static noinline int insert_dir_log_key(struct btrfs_trans_handle *trans, | |
2300 | struct btrfs_root *log, | |
2301 | struct btrfs_path *path, | |
2302 | int key_type, u64 dirid, | |
2303 | u64 first_offset, u64 last_offset) | |
2304 | { | |
2305 | int ret; | |
2306 | struct btrfs_key key; | |
2307 | struct btrfs_dir_log_item *item; | |
2308 | ||
2309 | key.objectid = dirid; | |
2310 | key.offset = first_offset; | |
2311 | if (key_type == BTRFS_DIR_ITEM_KEY) | |
2312 | key.type = BTRFS_DIR_LOG_ITEM_KEY; | |
2313 | else | |
2314 | key.type = BTRFS_DIR_LOG_INDEX_KEY; | |
2315 | ret = btrfs_insert_empty_item(trans, log, path, &key, sizeof(*item)); | |
2316 | BUG_ON(ret); | |
2317 | ||
2318 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
2319 | struct btrfs_dir_log_item); | |
2320 | btrfs_set_dir_log_end(path->nodes[0], item, last_offset); | |
2321 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2322 | btrfs_release_path(log, path); | |
2323 | return 0; | |
2324 | } | |
2325 | ||
2326 | /* | |
2327 | * log all the items included in the current transaction for a given | |
2328 | * directory. This also creates the range items in the log tree required | |
2329 | * to replay anything deleted before the fsync | |
2330 | */ | |
2331 | static noinline int log_dir_items(struct btrfs_trans_handle *trans, | |
2332 | struct btrfs_root *root, struct inode *inode, | |
2333 | struct btrfs_path *path, | |
2334 | struct btrfs_path *dst_path, int key_type, | |
2335 | u64 min_offset, u64 *last_offset_ret) | |
2336 | { | |
2337 | struct btrfs_key min_key; | |
2338 | struct btrfs_key max_key; | |
2339 | struct btrfs_root *log = root->log_root; | |
2340 | struct extent_buffer *src; | |
2341 | int ret; | |
2342 | int i; | |
2343 | int nritems; | |
2344 | u64 first_offset = min_offset; | |
2345 | u64 last_offset = (u64)-1; | |
2346 | ||
2347 | log = root->log_root; | |
2348 | max_key.objectid = inode->i_ino; | |
2349 | max_key.offset = (u64)-1; | |
2350 | max_key.type = key_type; | |
2351 | ||
2352 | min_key.objectid = inode->i_ino; | |
2353 | min_key.type = key_type; | |
2354 | min_key.offset = min_offset; | |
2355 | ||
2356 | path->keep_locks = 1; | |
2357 | ||
2358 | ret = btrfs_search_forward(root, &min_key, &max_key, | |
2359 | path, 0, trans->transid); | |
2360 | ||
2361 | /* | |
2362 | * we didn't find anything from this transaction, see if there | |
2363 | * is anything at all | |
2364 | */ | |
2365 | if (ret != 0 || min_key.objectid != inode->i_ino || | |
2366 | min_key.type != key_type) { | |
2367 | min_key.objectid = inode->i_ino; | |
2368 | min_key.type = key_type; | |
2369 | min_key.offset = (u64)-1; | |
2370 | btrfs_release_path(root, path); | |
2371 | ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0); | |
2372 | if (ret < 0) { | |
2373 | btrfs_release_path(root, path); | |
2374 | return ret; | |
2375 | } | |
2376 | ret = btrfs_previous_item(root, path, inode->i_ino, key_type); | |
2377 | ||
2378 | /* if ret == 0 there are items for this type, | |
2379 | * create a range to tell us the last key of this type. | |
2380 | * otherwise, there are no items in this directory after | |
2381 | * *min_offset, and we create a range to indicate that. | |
2382 | */ | |
2383 | if (ret == 0) { | |
2384 | struct btrfs_key tmp; | |
2385 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, | |
2386 | path->slots[0]); | |
d397712b | 2387 | if (key_type == tmp.type) |
e02119d5 | 2388 | first_offset = max(min_offset, tmp.offset) + 1; |
e02119d5 CM |
2389 | } |
2390 | goto done; | |
2391 | } | |
2392 | ||
2393 | /* go backward to find any previous key */ | |
2394 | ret = btrfs_previous_item(root, path, inode->i_ino, key_type); | |
2395 | if (ret == 0) { | |
2396 | struct btrfs_key tmp; | |
2397 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); | |
2398 | if (key_type == tmp.type) { | |
2399 | first_offset = tmp.offset; | |
2400 | ret = overwrite_item(trans, log, dst_path, | |
2401 | path->nodes[0], path->slots[0], | |
2402 | &tmp); | |
2403 | } | |
2404 | } | |
2405 | btrfs_release_path(root, path); | |
2406 | ||
2407 | /* find the first key from this transaction again */ | |
2408 | ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0); | |
2409 | if (ret != 0) { | |
2410 | WARN_ON(1); | |
2411 | goto done; | |
2412 | } | |
2413 | ||
2414 | /* | |
2415 | * we have a block from this transaction, log every item in it | |
2416 | * from our directory | |
2417 | */ | |
d397712b | 2418 | while (1) { |
e02119d5 CM |
2419 | struct btrfs_key tmp; |
2420 | src = path->nodes[0]; | |
2421 | nritems = btrfs_header_nritems(src); | |
2422 | for (i = path->slots[0]; i < nritems; i++) { | |
2423 | btrfs_item_key_to_cpu(src, &min_key, i); | |
2424 | ||
2425 | if (min_key.objectid != inode->i_ino || | |
2426 | min_key.type != key_type) | |
2427 | goto done; | |
2428 | ret = overwrite_item(trans, log, dst_path, src, i, | |
2429 | &min_key); | |
2430 | BUG_ON(ret); | |
2431 | } | |
2432 | path->slots[0] = nritems; | |
2433 | ||
2434 | /* | |
2435 | * look ahead to the next item and see if it is also | |
2436 | * from this directory and from this transaction | |
2437 | */ | |
2438 | ret = btrfs_next_leaf(root, path); | |
2439 | if (ret == 1) { | |
2440 | last_offset = (u64)-1; | |
2441 | goto done; | |
2442 | } | |
2443 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); | |
2444 | if (tmp.objectid != inode->i_ino || tmp.type != key_type) { | |
2445 | last_offset = (u64)-1; | |
2446 | goto done; | |
2447 | } | |
2448 | if (btrfs_header_generation(path->nodes[0]) != trans->transid) { | |
2449 | ret = overwrite_item(trans, log, dst_path, | |
2450 | path->nodes[0], path->slots[0], | |
2451 | &tmp); | |
2452 | ||
2453 | BUG_ON(ret); | |
2454 | last_offset = tmp.offset; | |
2455 | goto done; | |
2456 | } | |
2457 | } | |
2458 | done: | |
2459 | *last_offset_ret = last_offset; | |
2460 | btrfs_release_path(root, path); | |
2461 | btrfs_release_path(log, dst_path); | |
2462 | ||
2463 | /* insert the log range keys to indicate where the log is valid */ | |
2464 | ret = insert_dir_log_key(trans, log, path, key_type, inode->i_ino, | |
2465 | first_offset, last_offset); | |
2466 | BUG_ON(ret); | |
2467 | return 0; | |
2468 | } | |
2469 | ||
2470 | /* | |
2471 | * logging directories is very similar to logging inodes, We find all the items | |
2472 | * from the current transaction and write them to the log. | |
2473 | * | |
2474 | * The recovery code scans the directory in the subvolume, and if it finds a | |
2475 | * key in the range logged that is not present in the log tree, then it means | |
2476 | * that dir entry was unlinked during the transaction. | |
2477 | * | |
2478 | * In order for that scan to work, we must include one key smaller than | |
2479 | * the smallest logged by this transaction and one key larger than the largest | |
2480 | * key logged by this transaction. | |
2481 | */ | |
2482 | static noinline int log_directory_changes(struct btrfs_trans_handle *trans, | |
2483 | struct btrfs_root *root, struct inode *inode, | |
2484 | struct btrfs_path *path, | |
2485 | struct btrfs_path *dst_path) | |
2486 | { | |
2487 | u64 min_key; | |
2488 | u64 max_key; | |
2489 | int ret; | |
2490 | int key_type = BTRFS_DIR_ITEM_KEY; | |
2491 | ||
2492 | again: | |
2493 | min_key = 0; | |
2494 | max_key = 0; | |
d397712b | 2495 | while (1) { |
e02119d5 CM |
2496 | ret = log_dir_items(trans, root, inode, path, |
2497 | dst_path, key_type, min_key, | |
2498 | &max_key); | |
2499 | BUG_ON(ret); | |
2500 | if (max_key == (u64)-1) | |
2501 | break; | |
2502 | min_key = max_key + 1; | |
2503 | } | |
2504 | ||
2505 | if (key_type == BTRFS_DIR_ITEM_KEY) { | |
2506 | key_type = BTRFS_DIR_INDEX_KEY; | |
2507 | goto again; | |
2508 | } | |
2509 | return 0; | |
2510 | } | |
2511 | ||
2512 | /* | |
2513 | * a helper function to drop items from the log before we relog an | |
2514 | * inode. max_key_type indicates the highest item type to remove. | |
2515 | * This cannot be run for file data extents because it does not | |
2516 | * free the extents they point to. | |
2517 | */ | |
2518 | static int drop_objectid_items(struct btrfs_trans_handle *trans, | |
2519 | struct btrfs_root *log, | |
2520 | struct btrfs_path *path, | |
2521 | u64 objectid, int max_key_type) | |
2522 | { | |
2523 | int ret; | |
2524 | struct btrfs_key key; | |
2525 | struct btrfs_key found_key; | |
2526 | ||
2527 | key.objectid = objectid; | |
2528 | key.type = max_key_type; | |
2529 | key.offset = (u64)-1; | |
2530 | ||
d397712b | 2531 | while (1) { |
e02119d5 CM |
2532 | ret = btrfs_search_slot(trans, log, &key, path, -1, 1); |
2533 | ||
2534 | if (ret != 1) | |
2535 | break; | |
2536 | ||
2537 | if (path->slots[0] == 0) | |
2538 | break; | |
2539 | ||
2540 | path->slots[0]--; | |
2541 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
2542 | path->slots[0]); | |
2543 | ||
2544 | if (found_key.objectid != objectid) | |
2545 | break; | |
2546 | ||
2547 | ret = btrfs_del_item(trans, log, path); | |
2548 | BUG_ON(ret); | |
2549 | btrfs_release_path(log, path); | |
2550 | } | |
2551 | btrfs_release_path(log, path); | |
2552 | return 0; | |
2553 | } | |
2554 | ||
31ff1cd2 CM |
2555 | static noinline int copy_items(struct btrfs_trans_handle *trans, |
2556 | struct btrfs_root *log, | |
2557 | struct btrfs_path *dst_path, | |
2558 | struct extent_buffer *src, | |
2559 | int start_slot, int nr, int inode_only) | |
2560 | { | |
2561 | unsigned long src_offset; | |
2562 | unsigned long dst_offset; | |
2563 | struct btrfs_file_extent_item *extent; | |
2564 | struct btrfs_inode_item *inode_item; | |
2565 | int ret; | |
2566 | struct btrfs_key *ins_keys; | |
2567 | u32 *ins_sizes; | |
2568 | char *ins_data; | |
2569 | int i; | |
d20f7043 CM |
2570 | struct list_head ordered_sums; |
2571 | ||
2572 | INIT_LIST_HEAD(&ordered_sums); | |
31ff1cd2 CM |
2573 | |
2574 | ins_data = kmalloc(nr * sizeof(struct btrfs_key) + | |
2575 | nr * sizeof(u32), GFP_NOFS); | |
2576 | ins_sizes = (u32 *)ins_data; | |
2577 | ins_keys = (struct btrfs_key *)(ins_data + nr * sizeof(u32)); | |
2578 | ||
2579 | for (i = 0; i < nr; i++) { | |
2580 | ins_sizes[i] = btrfs_item_size_nr(src, i + start_slot); | |
2581 | btrfs_item_key_to_cpu(src, ins_keys + i, i + start_slot); | |
2582 | } | |
2583 | ret = btrfs_insert_empty_items(trans, log, dst_path, | |
2584 | ins_keys, ins_sizes, nr); | |
2585 | BUG_ON(ret); | |
2586 | ||
2587 | for (i = 0; i < nr; i++) { | |
2588 | dst_offset = btrfs_item_ptr_offset(dst_path->nodes[0], | |
2589 | dst_path->slots[0]); | |
2590 | ||
2591 | src_offset = btrfs_item_ptr_offset(src, start_slot + i); | |
2592 | ||
2593 | copy_extent_buffer(dst_path->nodes[0], src, dst_offset, | |
2594 | src_offset, ins_sizes[i]); | |
2595 | ||
2596 | if (inode_only == LOG_INODE_EXISTS && | |
2597 | ins_keys[i].type == BTRFS_INODE_ITEM_KEY) { | |
2598 | inode_item = btrfs_item_ptr(dst_path->nodes[0], | |
2599 | dst_path->slots[0], | |
2600 | struct btrfs_inode_item); | |
2601 | btrfs_set_inode_size(dst_path->nodes[0], inode_item, 0); | |
2602 | ||
2603 | /* set the generation to zero so the recover code | |
2604 | * can tell the difference between an logging | |
2605 | * just to say 'this inode exists' and a logging | |
2606 | * to say 'update this inode with these values' | |
2607 | */ | |
2608 | btrfs_set_inode_generation(dst_path->nodes[0], | |
2609 | inode_item, 0); | |
2610 | } | |
2611 | /* take a reference on file data extents so that truncates | |
2612 | * or deletes of this inode don't have to relog the inode | |
2613 | * again | |
2614 | */ | |
2615 | if (btrfs_key_type(ins_keys + i) == BTRFS_EXTENT_DATA_KEY) { | |
2616 | int found_type; | |
2617 | extent = btrfs_item_ptr(src, start_slot + i, | |
2618 | struct btrfs_file_extent_item); | |
2619 | ||
2620 | found_type = btrfs_file_extent_type(src, extent); | |
d899e052 YZ |
2621 | if (found_type == BTRFS_FILE_EXTENT_REG || |
2622 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
31ff1cd2 CM |
2623 | u64 ds = btrfs_file_extent_disk_bytenr(src, |
2624 | extent); | |
2625 | u64 dl = btrfs_file_extent_disk_num_bytes(src, | |
2626 | extent); | |
d20f7043 CM |
2627 | u64 cs = btrfs_file_extent_offset(src, extent); |
2628 | u64 cl = btrfs_file_extent_num_bytes(src, | |
2629 | extent);; | |
580afd76 CM |
2630 | if (btrfs_file_extent_compression(src, |
2631 | extent)) { | |
2632 | cs = 0; | |
2633 | cl = dl; | |
2634 | } | |
31ff1cd2 CM |
2635 | /* ds == 0 is a hole */ |
2636 | if (ds != 0) { | |
2637 | ret = btrfs_inc_extent_ref(trans, log, | |
2638 | ds, dl, | |
31840ae1 | 2639 | dst_path->nodes[0]->start, |
31ff1cd2 | 2640 | BTRFS_TREE_LOG_OBJECTID, |
31840ae1 | 2641 | trans->transid, |
3bb1a1bc | 2642 | ins_keys[i].objectid); |
31ff1cd2 | 2643 | BUG_ON(ret); |
07d400a6 YZ |
2644 | ret = btrfs_lookup_csums_range( |
2645 | log->fs_info->csum_root, | |
2646 | ds + cs, ds + cs + cl - 1, | |
2647 | &ordered_sums); | |
d20f7043 | 2648 | BUG_ON(ret); |
31ff1cd2 CM |
2649 | } |
2650 | } | |
2651 | } | |
2652 | dst_path->slots[0]++; | |
2653 | } | |
2654 | ||
2655 | btrfs_mark_buffer_dirty(dst_path->nodes[0]); | |
2656 | btrfs_release_path(log, dst_path); | |
2657 | kfree(ins_data); | |
d20f7043 CM |
2658 | |
2659 | /* | |
2660 | * we have to do this after the loop above to avoid changing the | |
2661 | * log tree while trying to change the log tree. | |
2662 | */ | |
d397712b | 2663 | while (!list_empty(&ordered_sums)) { |
d20f7043 CM |
2664 | struct btrfs_ordered_sum *sums = list_entry(ordered_sums.next, |
2665 | struct btrfs_ordered_sum, | |
2666 | list); | |
2667 | ret = btrfs_csum_file_blocks(trans, log, sums); | |
2668 | BUG_ON(ret); | |
2669 | list_del(&sums->list); | |
2670 | kfree(sums); | |
2671 | } | |
31ff1cd2 CM |
2672 | return 0; |
2673 | } | |
2674 | ||
e02119d5 CM |
2675 | /* log a single inode in the tree log. |
2676 | * At least one parent directory for this inode must exist in the tree | |
2677 | * or be logged already. | |
2678 | * | |
2679 | * Any items from this inode changed by the current transaction are copied | |
2680 | * to the log tree. An extra reference is taken on any extents in this | |
2681 | * file, allowing us to avoid a whole pile of corner cases around logging | |
2682 | * blocks that have been removed from the tree. | |
2683 | * | |
2684 | * See LOG_INODE_ALL and related defines for a description of what inode_only | |
2685 | * does. | |
2686 | * | |
2687 | * This handles both files and directories. | |
2688 | */ | |
12fcfd22 | 2689 | static int btrfs_log_inode(struct btrfs_trans_handle *trans, |
e02119d5 CM |
2690 | struct btrfs_root *root, struct inode *inode, |
2691 | int inode_only) | |
2692 | { | |
2693 | struct btrfs_path *path; | |
2694 | struct btrfs_path *dst_path; | |
2695 | struct btrfs_key min_key; | |
2696 | struct btrfs_key max_key; | |
2697 | struct btrfs_root *log = root->log_root; | |
31ff1cd2 | 2698 | struct extent_buffer *src = NULL; |
e02119d5 CM |
2699 | u32 size; |
2700 | int ret; | |
3a5f1d45 | 2701 | int nritems; |
31ff1cd2 CM |
2702 | int ins_start_slot = 0; |
2703 | int ins_nr; | |
e02119d5 CM |
2704 | |
2705 | log = root->log_root; | |
2706 | ||
2707 | path = btrfs_alloc_path(); | |
2708 | dst_path = btrfs_alloc_path(); | |
2709 | ||
2710 | min_key.objectid = inode->i_ino; | |
2711 | min_key.type = BTRFS_INODE_ITEM_KEY; | |
2712 | min_key.offset = 0; | |
2713 | ||
2714 | max_key.objectid = inode->i_ino; | |
12fcfd22 CM |
2715 | |
2716 | /* today the code can only do partial logging of directories */ | |
2717 | if (!S_ISDIR(inode->i_mode)) | |
2718 | inode_only = LOG_INODE_ALL; | |
2719 | ||
e02119d5 CM |
2720 | if (inode_only == LOG_INODE_EXISTS || S_ISDIR(inode->i_mode)) |
2721 | max_key.type = BTRFS_XATTR_ITEM_KEY; | |
2722 | else | |
2723 | max_key.type = (u8)-1; | |
2724 | max_key.offset = (u64)-1; | |
2725 | ||
e02119d5 CM |
2726 | mutex_lock(&BTRFS_I(inode)->log_mutex); |
2727 | ||
2728 | /* | |
2729 | * a brute force approach to making sure we get the most uptodate | |
2730 | * copies of everything. | |
2731 | */ | |
2732 | if (S_ISDIR(inode->i_mode)) { | |
2733 | int max_key_type = BTRFS_DIR_LOG_INDEX_KEY; | |
2734 | ||
2735 | if (inode_only == LOG_INODE_EXISTS) | |
2736 | max_key_type = BTRFS_XATTR_ITEM_KEY; | |
2737 | ret = drop_objectid_items(trans, log, path, | |
2738 | inode->i_ino, max_key_type); | |
2739 | } else { | |
2740 | ret = btrfs_truncate_inode_items(trans, log, inode, 0, 0); | |
2741 | } | |
2742 | BUG_ON(ret); | |
2743 | path->keep_locks = 1; | |
2744 | ||
d397712b | 2745 | while (1) { |
31ff1cd2 | 2746 | ins_nr = 0; |
e02119d5 CM |
2747 | ret = btrfs_search_forward(root, &min_key, &max_key, |
2748 | path, 0, trans->transid); | |
2749 | if (ret != 0) | |
2750 | break; | |
3a5f1d45 | 2751 | again: |
31ff1cd2 | 2752 | /* note, ins_nr might be > 0 here, cleanup outside the loop */ |
e02119d5 CM |
2753 | if (min_key.objectid != inode->i_ino) |
2754 | break; | |
2755 | if (min_key.type > max_key.type) | |
2756 | break; | |
31ff1cd2 | 2757 | |
e02119d5 CM |
2758 | src = path->nodes[0]; |
2759 | size = btrfs_item_size_nr(src, path->slots[0]); | |
31ff1cd2 CM |
2760 | if (ins_nr && ins_start_slot + ins_nr == path->slots[0]) { |
2761 | ins_nr++; | |
2762 | goto next_slot; | |
2763 | } else if (!ins_nr) { | |
2764 | ins_start_slot = path->slots[0]; | |
2765 | ins_nr = 1; | |
2766 | goto next_slot; | |
e02119d5 CM |
2767 | } |
2768 | ||
31ff1cd2 CM |
2769 | ret = copy_items(trans, log, dst_path, src, ins_start_slot, |
2770 | ins_nr, inode_only); | |
2771 | BUG_ON(ret); | |
2772 | ins_nr = 1; | |
2773 | ins_start_slot = path->slots[0]; | |
2774 | next_slot: | |
e02119d5 | 2775 | |
3a5f1d45 CM |
2776 | nritems = btrfs_header_nritems(path->nodes[0]); |
2777 | path->slots[0]++; | |
2778 | if (path->slots[0] < nritems) { | |
2779 | btrfs_item_key_to_cpu(path->nodes[0], &min_key, | |
2780 | path->slots[0]); | |
2781 | goto again; | |
2782 | } | |
31ff1cd2 CM |
2783 | if (ins_nr) { |
2784 | ret = copy_items(trans, log, dst_path, src, | |
2785 | ins_start_slot, | |
2786 | ins_nr, inode_only); | |
2787 | BUG_ON(ret); | |
2788 | ins_nr = 0; | |
2789 | } | |
3a5f1d45 CM |
2790 | btrfs_release_path(root, path); |
2791 | ||
e02119d5 CM |
2792 | if (min_key.offset < (u64)-1) |
2793 | min_key.offset++; | |
2794 | else if (min_key.type < (u8)-1) | |
2795 | min_key.type++; | |
2796 | else if (min_key.objectid < (u64)-1) | |
2797 | min_key.objectid++; | |
2798 | else | |
2799 | break; | |
2800 | } | |
31ff1cd2 CM |
2801 | if (ins_nr) { |
2802 | ret = copy_items(trans, log, dst_path, src, | |
2803 | ins_start_slot, | |
2804 | ins_nr, inode_only); | |
2805 | BUG_ON(ret); | |
2806 | ins_nr = 0; | |
2807 | } | |
2808 | WARN_ON(ins_nr); | |
9623f9a3 | 2809 | if (inode_only == LOG_INODE_ALL && S_ISDIR(inode->i_mode)) { |
e02119d5 CM |
2810 | btrfs_release_path(root, path); |
2811 | btrfs_release_path(log, dst_path); | |
2812 | ret = log_directory_changes(trans, root, inode, path, dst_path); | |
2813 | BUG_ON(ret); | |
2814 | } | |
3a5f1d45 | 2815 | BTRFS_I(inode)->logged_trans = trans->transid; |
e02119d5 CM |
2816 | mutex_unlock(&BTRFS_I(inode)->log_mutex); |
2817 | ||
2818 | btrfs_free_path(path); | |
2819 | btrfs_free_path(dst_path); | |
e02119d5 CM |
2820 | return 0; |
2821 | } | |
2822 | ||
12fcfd22 CM |
2823 | /* |
2824 | * follow the dentry parent pointers up the chain and see if any | |
2825 | * of the directories in it require a full commit before they can | |
2826 | * be logged. Returns zero if nothing special needs to be done or 1 if | |
2827 | * a full commit is required. | |
2828 | */ | |
2829 | static noinline int check_parent_dirs_for_sync(struct btrfs_trans_handle *trans, | |
2830 | struct inode *inode, | |
2831 | struct dentry *parent, | |
2832 | struct super_block *sb, | |
2833 | u64 last_committed) | |
e02119d5 | 2834 | { |
12fcfd22 CM |
2835 | int ret = 0; |
2836 | struct btrfs_root *root; | |
e02119d5 | 2837 | |
af4176b4 CM |
2838 | /* |
2839 | * for regular files, if its inode is already on disk, we don't | |
2840 | * have to worry about the parents at all. This is because | |
2841 | * we can use the last_unlink_trans field to record renames | |
2842 | * and other fun in this file. | |
2843 | */ | |
2844 | if (S_ISREG(inode->i_mode) && | |
2845 | BTRFS_I(inode)->generation <= last_committed && | |
2846 | BTRFS_I(inode)->last_unlink_trans <= last_committed) | |
2847 | goto out; | |
2848 | ||
12fcfd22 CM |
2849 | if (!S_ISDIR(inode->i_mode)) { |
2850 | if (!parent || !parent->d_inode || sb != parent->d_inode->i_sb) | |
2851 | goto out; | |
2852 | inode = parent->d_inode; | |
2853 | } | |
2854 | ||
2855 | while (1) { | |
2856 | BTRFS_I(inode)->logged_trans = trans->transid; | |
2857 | smp_mb(); | |
2858 | ||
2859 | if (BTRFS_I(inode)->last_unlink_trans > last_committed) { | |
2860 | root = BTRFS_I(inode)->root; | |
2861 | ||
2862 | /* | |
2863 | * make sure any commits to the log are forced | |
2864 | * to be full commits | |
2865 | */ | |
2866 | root->fs_info->last_trans_log_full_commit = | |
2867 | trans->transid; | |
2868 | ret = 1; | |
2869 | break; | |
2870 | } | |
2871 | ||
2872 | if (!parent || !parent->d_inode || sb != parent->d_inode->i_sb) | |
2873 | break; | |
2874 | ||
2875 | if (parent == sb->s_root) | |
2876 | break; | |
2877 | ||
2878 | parent = parent->d_parent; | |
2879 | inode = parent->d_inode; | |
2880 | ||
2881 | } | |
2882 | out: | |
e02119d5 CM |
2883 | return ret; |
2884 | } | |
2885 | ||
2886 | /* | |
2887 | * helper function around btrfs_log_inode to make sure newly created | |
2888 | * parent directories also end up in the log. A minimal inode and backref | |
2889 | * only logging is done of any parent directories that are older than | |
2890 | * the last committed transaction | |
2891 | */ | |
12fcfd22 CM |
2892 | int btrfs_log_inode_parent(struct btrfs_trans_handle *trans, |
2893 | struct btrfs_root *root, struct inode *inode, | |
2894 | struct dentry *parent, int exists_only) | |
e02119d5 | 2895 | { |
12fcfd22 | 2896 | int inode_only = exists_only ? LOG_INODE_EXISTS : LOG_INODE_ALL; |
e02119d5 | 2897 | struct super_block *sb; |
12fcfd22 CM |
2898 | int ret = 0; |
2899 | u64 last_committed = root->fs_info->last_trans_committed; | |
2900 | ||
2901 | sb = inode->i_sb; | |
2902 | ||
2903 | if (root->fs_info->last_trans_log_full_commit > | |
2904 | root->fs_info->last_trans_committed) { | |
2905 | ret = 1; | |
2906 | goto end_no_trans; | |
2907 | } | |
2908 | ||
2909 | ret = check_parent_dirs_for_sync(trans, inode, parent, | |
2910 | sb, last_committed); | |
2911 | if (ret) | |
2912 | goto end_no_trans; | |
e02119d5 CM |
2913 | |
2914 | start_log_trans(trans, root); | |
e02119d5 | 2915 | |
12fcfd22 CM |
2916 | ret = btrfs_log_inode(trans, root, inode, inode_only); |
2917 | BUG_ON(ret); | |
12fcfd22 | 2918 | |
af4176b4 CM |
2919 | /* |
2920 | * for regular files, if its inode is already on disk, we don't | |
2921 | * have to worry about the parents at all. This is because | |
2922 | * we can use the last_unlink_trans field to record renames | |
2923 | * and other fun in this file. | |
2924 | */ | |
2925 | if (S_ISREG(inode->i_mode) && | |
2926 | BTRFS_I(inode)->generation <= last_committed && | |
2927 | BTRFS_I(inode)->last_unlink_trans <= last_committed) | |
2928 | goto no_parent; | |
2929 | ||
2930 | inode_only = LOG_INODE_EXISTS; | |
12fcfd22 CM |
2931 | while (1) { |
2932 | if (!parent || !parent->d_inode || sb != parent->d_inode->i_sb) | |
e02119d5 CM |
2933 | break; |
2934 | ||
12fcfd22 CM |
2935 | inode = parent->d_inode; |
2936 | if (BTRFS_I(inode)->generation > | |
2937 | root->fs_info->last_trans_committed) { | |
2938 | ret = btrfs_log_inode(trans, root, inode, inode_only); | |
2939 | BUG_ON(ret); | |
2940 | } | |
2941 | if (parent == sb->s_root) | |
e02119d5 | 2942 | break; |
12fcfd22 CM |
2943 | |
2944 | parent = parent->d_parent; | |
e02119d5 | 2945 | } |
af4176b4 | 2946 | no_parent: |
12fcfd22 CM |
2947 | ret = 0; |
2948 | btrfs_end_log_trans(root); | |
2949 | end_no_trans: | |
2950 | return ret; | |
e02119d5 CM |
2951 | } |
2952 | ||
2953 | /* | |
2954 | * it is not safe to log dentry if the chunk root has added new | |
2955 | * chunks. This returns 0 if the dentry was logged, and 1 otherwise. | |
2956 | * If this returns 1, you must commit the transaction to safely get your | |
2957 | * data on disk. | |
2958 | */ | |
2959 | int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans, | |
2960 | struct btrfs_root *root, struct dentry *dentry) | |
2961 | { | |
12fcfd22 CM |
2962 | return btrfs_log_inode_parent(trans, root, dentry->d_inode, |
2963 | dentry->d_parent, 0); | |
e02119d5 CM |
2964 | } |
2965 | ||
2966 | /* | |
2967 | * should be called during mount to recover any replay any log trees | |
2968 | * from the FS | |
2969 | */ | |
2970 | int btrfs_recover_log_trees(struct btrfs_root *log_root_tree) | |
2971 | { | |
2972 | int ret; | |
2973 | struct btrfs_path *path; | |
2974 | struct btrfs_trans_handle *trans; | |
2975 | struct btrfs_key key; | |
2976 | struct btrfs_key found_key; | |
2977 | struct btrfs_key tmp_key; | |
2978 | struct btrfs_root *log; | |
2979 | struct btrfs_fs_info *fs_info = log_root_tree->fs_info; | |
8d5bf1cb | 2980 | u64 highest_inode; |
e02119d5 CM |
2981 | struct walk_control wc = { |
2982 | .process_func = process_one_buffer, | |
2983 | .stage = 0, | |
2984 | }; | |
2985 | ||
2986 | fs_info->log_root_recovering = 1; | |
2987 | path = btrfs_alloc_path(); | |
2988 | BUG_ON(!path); | |
2989 | ||
2990 | trans = btrfs_start_transaction(fs_info->tree_root, 1); | |
2991 | ||
2992 | wc.trans = trans; | |
2993 | wc.pin = 1; | |
2994 | ||
2995 | walk_log_tree(trans, log_root_tree, &wc); | |
2996 | ||
2997 | again: | |
2998 | key.objectid = BTRFS_TREE_LOG_OBJECTID; | |
2999 | key.offset = (u64)-1; | |
3000 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
3001 | ||
d397712b | 3002 | while (1) { |
e02119d5 CM |
3003 | ret = btrfs_search_slot(NULL, log_root_tree, &key, path, 0, 0); |
3004 | if (ret < 0) | |
3005 | break; | |
3006 | if (ret > 0) { | |
3007 | if (path->slots[0] == 0) | |
3008 | break; | |
3009 | path->slots[0]--; | |
3010 | } | |
3011 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
3012 | path->slots[0]); | |
3013 | btrfs_release_path(log_root_tree, path); | |
3014 | if (found_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
3015 | break; | |
3016 | ||
3017 | log = btrfs_read_fs_root_no_radix(log_root_tree, | |
3018 | &found_key); | |
3019 | BUG_ON(!log); | |
3020 | ||
3021 | ||
3022 | tmp_key.objectid = found_key.offset; | |
3023 | tmp_key.type = BTRFS_ROOT_ITEM_KEY; | |
3024 | tmp_key.offset = (u64)-1; | |
3025 | ||
3026 | wc.replay_dest = btrfs_read_fs_root_no_name(fs_info, &tmp_key); | |
e02119d5 CM |
3027 | BUG_ON(!wc.replay_dest); |
3028 | ||
07d400a6 | 3029 | wc.replay_dest->log_root = log; |
24562425 | 3030 | mutex_lock(&fs_info->trans_mutex); |
e02119d5 | 3031 | btrfs_record_root_in_trans(wc.replay_dest); |
24562425 | 3032 | mutex_unlock(&fs_info->trans_mutex); |
e02119d5 CM |
3033 | ret = walk_log_tree(trans, log, &wc); |
3034 | BUG_ON(ret); | |
3035 | ||
3036 | if (wc.stage == LOG_WALK_REPLAY_ALL) { | |
3037 | ret = fixup_inode_link_counts(trans, wc.replay_dest, | |
3038 | path); | |
3039 | BUG_ON(ret); | |
3040 | } | |
8d5bf1cb CM |
3041 | ret = btrfs_find_highest_inode(wc.replay_dest, &highest_inode); |
3042 | if (ret == 0) { | |
3043 | wc.replay_dest->highest_inode = highest_inode; | |
3044 | wc.replay_dest->last_inode_alloc = highest_inode; | |
3045 | } | |
e02119d5 CM |
3046 | |
3047 | key.offset = found_key.offset - 1; | |
07d400a6 | 3048 | wc.replay_dest->log_root = NULL; |
e02119d5 CM |
3049 | free_extent_buffer(log->node); |
3050 | kfree(log); | |
3051 | ||
3052 | if (found_key.offset == 0) | |
3053 | break; | |
3054 | } | |
3055 | btrfs_release_path(log_root_tree, path); | |
3056 | ||
3057 | /* step one is to pin it all, step two is to replay just inodes */ | |
3058 | if (wc.pin) { | |
3059 | wc.pin = 0; | |
3060 | wc.process_func = replay_one_buffer; | |
3061 | wc.stage = LOG_WALK_REPLAY_INODES; | |
3062 | goto again; | |
3063 | } | |
3064 | /* step three is to replay everything */ | |
3065 | if (wc.stage < LOG_WALK_REPLAY_ALL) { | |
3066 | wc.stage++; | |
3067 | goto again; | |
3068 | } | |
3069 | ||
3070 | btrfs_free_path(path); | |
3071 | ||
3072 | free_extent_buffer(log_root_tree->node); | |
3073 | log_root_tree->log_root = NULL; | |
3074 | fs_info->log_root_recovering = 0; | |
3075 | ||
3076 | /* step 4: commit the transaction, which also unpins the blocks */ | |
3077 | btrfs_commit_transaction(trans, fs_info->tree_root); | |
3078 | ||
3079 | kfree(log_root_tree); | |
3080 | return 0; | |
3081 | } | |
12fcfd22 CM |
3082 | |
3083 | /* | |
3084 | * there are some corner cases where we want to force a full | |
3085 | * commit instead of allowing a directory to be logged. | |
3086 | * | |
3087 | * They revolve around files there were unlinked from the directory, and | |
3088 | * this function updates the parent directory so that a full commit is | |
3089 | * properly done if it is fsync'd later after the unlinks are done. | |
3090 | */ | |
3091 | void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans, | |
3092 | struct inode *dir, struct inode *inode, | |
3093 | int for_rename) | |
3094 | { | |
af4176b4 CM |
3095 | /* |
3096 | * when we're logging a file, if it hasn't been renamed | |
3097 | * or unlinked, and its inode is fully committed on disk, | |
3098 | * we don't have to worry about walking up the directory chain | |
3099 | * to log its parents. | |
3100 | * | |
3101 | * So, we use the last_unlink_trans field to put this transid | |
3102 | * into the file. When the file is logged we check it and | |
3103 | * don't log the parents if the file is fully on disk. | |
3104 | */ | |
3105 | if (S_ISREG(inode->i_mode)) | |
3106 | BTRFS_I(inode)->last_unlink_trans = trans->transid; | |
3107 | ||
12fcfd22 CM |
3108 | /* |
3109 | * if this directory was already logged any new | |
3110 | * names for this file/dir will get recorded | |
3111 | */ | |
3112 | smp_mb(); | |
3113 | if (BTRFS_I(dir)->logged_trans == trans->transid) | |
3114 | return; | |
3115 | ||
3116 | /* | |
3117 | * if the inode we're about to unlink was logged, | |
3118 | * the log will be properly updated for any new names | |
3119 | */ | |
3120 | if (BTRFS_I(inode)->logged_trans == trans->transid) | |
3121 | return; | |
3122 | ||
3123 | /* | |
3124 | * when renaming files across directories, if the directory | |
3125 | * there we're unlinking from gets fsync'd later on, there's | |
3126 | * no way to find the destination directory later and fsync it | |
3127 | * properly. So, we have to be conservative and force commits | |
3128 | * so the new name gets discovered. | |
3129 | */ | |
3130 | if (for_rename) | |
3131 | goto record; | |
3132 | ||
3133 | /* we can safely do the unlink without any special recording */ | |
3134 | return; | |
3135 | ||
3136 | record: | |
3137 | BTRFS_I(dir)->last_unlink_trans = trans->transid; | |
3138 | } | |
3139 | ||
3140 | /* | |
3141 | * Call this after adding a new name for a file and it will properly | |
3142 | * update the log to reflect the new name. | |
3143 | * | |
3144 | * It will return zero if all goes well, and it will return 1 if a | |
3145 | * full transaction commit is required. | |
3146 | */ | |
3147 | int btrfs_log_new_name(struct btrfs_trans_handle *trans, | |
3148 | struct inode *inode, struct inode *old_dir, | |
3149 | struct dentry *parent) | |
3150 | { | |
3151 | struct btrfs_root * root = BTRFS_I(inode)->root; | |
3152 | ||
af4176b4 CM |
3153 | /* |
3154 | * this will force the logging code to walk the dentry chain | |
3155 | * up for the file | |
3156 | */ | |
3157 | if (S_ISREG(inode->i_mode)) | |
3158 | BTRFS_I(inode)->last_unlink_trans = trans->transid; | |
3159 | ||
12fcfd22 CM |
3160 | /* |
3161 | * if this inode hasn't been logged and directory we're renaming it | |
3162 | * from hasn't been logged, we don't need to log it | |
3163 | */ | |
3164 | if (BTRFS_I(inode)->logged_trans <= | |
3165 | root->fs_info->last_trans_committed && | |
3166 | (!old_dir || BTRFS_I(old_dir)->logged_trans <= | |
3167 | root->fs_info->last_trans_committed)) | |
3168 | return 0; | |
3169 | ||
3170 | return btrfs_log_inode_parent(trans, root, inode, parent, 1); | |
3171 | } | |
3172 |