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e02119d5 CM |
1 | /* |
2 | * Copyright (C) 2008 Oracle. All rights reserved. | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public | |
6 | * License v2 as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope that it will be useful, | |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
11 | * General Public License for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public | |
14 | * License along with this program; if not, write to the | |
15 | * Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
16 | * Boston, MA 021110-1307, USA. | |
17 | */ | |
18 | ||
19 | #include <linux/sched.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
e02119d5 CM |
21 | #include "ctree.h" |
22 | #include "transaction.h" | |
23 | #include "disk-io.h" | |
24 | #include "locking.h" | |
25 | #include "print-tree.h" | |
26 | #include "compat.h" | |
b2950863 | 27 | #include "tree-log.h" |
e02119d5 CM |
28 | |
29 | /* magic values for the inode_only field in btrfs_log_inode: | |
30 | * | |
31 | * LOG_INODE_ALL means to log everything | |
32 | * LOG_INODE_EXISTS means to log just enough to recreate the inode | |
33 | * during log replay | |
34 | */ | |
35 | #define LOG_INODE_ALL 0 | |
36 | #define LOG_INODE_EXISTS 1 | |
37 | ||
12fcfd22 CM |
38 | /* |
39 | * directory trouble cases | |
40 | * | |
41 | * 1) on rename or unlink, if the inode being unlinked isn't in the fsync | |
42 | * log, we must force a full commit before doing an fsync of the directory | |
43 | * where the unlink was done. | |
44 | * ---> record transid of last unlink/rename per directory | |
45 | * | |
46 | * mkdir foo/some_dir | |
47 | * normal commit | |
48 | * rename foo/some_dir foo2/some_dir | |
49 | * mkdir foo/some_dir | |
50 | * fsync foo/some_dir/some_file | |
51 | * | |
52 | * The fsync above will unlink the original some_dir without recording | |
53 | * it in its new location (foo2). After a crash, some_dir will be gone | |
54 | * unless the fsync of some_file forces a full commit | |
55 | * | |
56 | * 2) we must log any new names for any file or dir that is in the fsync | |
57 | * log. ---> check inode while renaming/linking. | |
58 | * | |
59 | * 2a) we must log any new names for any file or dir during rename | |
60 | * when the directory they are being removed from was logged. | |
61 | * ---> check inode and old parent dir during rename | |
62 | * | |
63 | * 2a is actually the more important variant. With the extra logging | |
64 | * a crash might unlink the old name without recreating the new one | |
65 | * | |
66 | * 3) after a crash, we must go through any directories with a link count | |
67 | * of zero and redo the rm -rf | |
68 | * | |
69 | * mkdir f1/foo | |
70 | * normal commit | |
71 | * rm -rf f1/foo | |
72 | * fsync(f1) | |
73 | * | |
74 | * The directory f1 was fully removed from the FS, but fsync was never | |
75 | * called on f1, only its parent dir. After a crash the rm -rf must | |
76 | * be replayed. This must be able to recurse down the entire | |
77 | * directory tree. The inode link count fixup code takes care of the | |
78 | * ugly details. | |
79 | */ | |
80 | ||
e02119d5 CM |
81 | /* |
82 | * stages for the tree walking. The first | |
83 | * stage (0) is to only pin down the blocks we find | |
84 | * the second stage (1) is to make sure that all the inodes | |
85 | * we find in the log are created in the subvolume. | |
86 | * | |
87 | * The last stage is to deal with directories and links and extents | |
88 | * and all the other fun semantics | |
89 | */ | |
90 | #define LOG_WALK_PIN_ONLY 0 | |
91 | #define LOG_WALK_REPLAY_INODES 1 | |
92 | #define LOG_WALK_REPLAY_ALL 2 | |
93 | ||
12fcfd22 | 94 | static int btrfs_log_inode(struct btrfs_trans_handle *trans, |
e02119d5 CM |
95 | struct btrfs_root *root, struct inode *inode, |
96 | int inode_only); | |
ec051c0f YZ |
97 | static int link_to_fixup_dir(struct btrfs_trans_handle *trans, |
98 | struct btrfs_root *root, | |
99 | struct btrfs_path *path, u64 objectid); | |
12fcfd22 CM |
100 | static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, |
101 | struct btrfs_root *root, | |
102 | struct btrfs_root *log, | |
103 | struct btrfs_path *path, | |
104 | u64 dirid, int del_all); | |
e02119d5 CM |
105 | |
106 | /* | |
107 | * tree logging is a special write ahead log used to make sure that | |
108 | * fsyncs and O_SYNCs can happen without doing full tree commits. | |
109 | * | |
110 | * Full tree commits are expensive because they require commonly | |
111 | * modified blocks to be recowed, creating many dirty pages in the | |
112 | * extent tree an 4x-6x higher write load than ext3. | |
113 | * | |
114 | * Instead of doing a tree commit on every fsync, we use the | |
115 | * key ranges and transaction ids to find items for a given file or directory | |
116 | * that have changed in this transaction. Those items are copied into | |
117 | * a special tree (one per subvolume root), that tree is written to disk | |
118 | * and then the fsync is considered complete. | |
119 | * | |
120 | * After a crash, items are copied out of the log-tree back into the | |
121 | * subvolume tree. Any file data extents found are recorded in the extent | |
122 | * allocation tree, and the log-tree freed. | |
123 | * | |
124 | * The log tree is read three times, once to pin down all the extents it is | |
125 | * using in ram and once, once to create all the inodes logged in the tree | |
126 | * and once to do all the other items. | |
127 | */ | |
128 | ||
e02119d5 CM |
129 | /* |
130 | * start a sub transaction and setup the log tree | |
131 | * this increments the log tree writer count to make the people | |
132 | * syncing the tree wait for us to finish | |
133 | */ | |
134 | static int start_log_trans(struct btrfs_trans_handle *trans, | |
135 | struct btrfs_root *root) | |
136 | { | |
137 | int ret; | |
4a500fd1 | 138 | int err = 0; |
7237f183 YZ |
139 | |
140 | mutex_lock(&root->log_mutex); | |
141 | if (root->log_root) { | |
ff782e0a JB |
142 | if (!root->log_start_pid) { |
143 | root->log_start_pid = current->pid; | |
144 | root->log_multiple_pids = false; | |
145 | } else if (root->log_start_pid != current->pid) { | |
146 | root->log_multiple_pids = true; | |
147 | } | |
148 | ||
7237f183 YZ |
149 | root->log_batch++; |
150 | atomic_inc(&root->log_writers); | |
151 | mutex_unlock(&root->log_mutex); | |
152 | return 0; | |
153 | } | |
ff782e0a JB |
154 | root->log_multiple_pids = false; |
155 | root->log_start_pid = current->pid; | |
e02119d5 CM |
156 | mutex_lock(&root->fs_info->tree_log_mutex); |
157 | if (!root->fs_info->log_root_tree) { | |
158 | ret = btrfs_init_log_root_tree(trans, root->fs_info); | |
4a500fd1 YZ |
159 | if (ret) |
160 | err = ret; | |
e02119d5 | 161 | } |
4a500fd1 | 162 | if (err == 0 && !root->log_root) { |
e02119d5 | 163 | ret = btrfs_add_log_tree(trans, root); |
4a500fd1 YZ |
164 | if (ret) |
165 | err = ret; | |
e02119d5 | 166 | } |
e02119d5 | 167 | mutex_unlock(&root->fs_info->tree_log_mutex); |
7237f183 YZ |
168 | root->log_batch++; |
169 | atomic_inc(&root->log_writers); | |
170 | mutex_unlock(&root->log_mutex); | |
4a500fd1 | 171 | return err; |
e02119d5 CM |
172 | } |
173 | ||
174 | /* | |
175 | * returns 0 if there was a log transaction running and we were able | |
176 | * to join, or returns -ENOENT if there were not transactions | |
177 | * in progress | |
178 | */ | |
179 | static int join_running_log_trans(struct btrfs_root *root) | |
180 | { | |
181 | int ret = -ENOENT; | |
182 | ||
183 | smp_mb(); | |
184 | if (!root->log_root) | |
185 | return -ENOENT; | |
186 | ||
7237f183 | 187 | mutex_lock(&root->log_mutex); |
e02119d5 CM |
188 | if (root->log_root) { |
189 | ret = 0; | |
7237f183 | 190 | atomic_inc(&root->log_writers); |
e02119d5 | 191 | } |
7237f183 | 192 | mutex_unlock(&root->log_mutex); |
e02119d5 CM |
193 | return ret; |
194 | } | |
195 | ||
12fcfd22 CM |
196 | /* |
197 | * This either makes the current running log transaction wait | |
198 | * until you call btrfs_end_log_trans() or it makes any future | |
199 | * log transactions wait until you call btrfs_end_log_trans() | |
200 | */ | |
201 | int btrfs_pin_log_trans(struct btrfs_root *root) | |
202 | { | |
203 | int ret = -ENOENT; | |
204 | ||
205 | mutex_lock(&root->log_mutex); | |
206 | atomic_inc(&root->log_writers); | |
207 | mutex_unlock(&root->log_mutex); | |
208 | return ret; | |
209 | } | |
210 | ||
e02119d5 CM |
211 | /* |
212 | * indicate we're done making changes to the log tree | |
213 | * and wake up anyone waiting to do a sync | |
214 | */ | |
12fcfd22 | 215 | int btrfs_end_log_trans(struct btrfs_root *root) |
e02119d5 | 216 | { |
7237f183 YZ |
217 | if (atomic_dec_and_test(&root->log_writers)) { |
218 | smp_mb(); | |
219 | if (waitqueue_active(&root->log_writer_wait)) | |
220 | wake_up(&root->log_writer_wait); | |
221 | } | |
e02119d5 CM |
222 | return 0; |
223 | } | |
224 | ||
225 | ||
226 | /* | |
227 | * the walk control struct is used to pass state down the chain when | |
228 | * processing the log tree. The stage field tells us which part | |
229 | * of the log tree processing we are currently doing. The others | |
230 | * are state fields used for that specific part | |
231 | */ | |
232 | struct walk_control { | |
233 | /* should we free the extent on disk when done? This is used | |
234 | * at transaction commit time while freeing a log tree | |
235 | */ | |
236 | int free; | |
237 | ||
238 | /* should we write out the extent buffer? This is used | |
239 | * while flushing the log tree to disk during a sync | |
240 | */ | |
241 | int write; | |
242 | ||
243 | /* should we wait for the extent buffer io to finish? Also used | |
244 | * while flushing the log tree to disk for a sync | |
245 | */ | |
246 | int wait; | |
247 | ||
248 | /* pin only walk, we record which extents on disk belong to the | |
249 | * log trees | |
250 | */ | |
251 | int pin; | |
252 | ||
253 | /* what stage of the replay code we're currently in */ | |
254 | int stage; | |
255 | ||
256 | /* the root we are currently replaying */ | |
257 | struct btrfs_root *replay_dest; | |
258 | ||
259 | /* the trans handle for the current replay */ | |
260 | struct btrfs_trans_handle *trans; | |
261 | ||
262 | /* the function that gets used to process blocks we find in the | |
263 | * tree. Note the extent_buffer might not be up to date when it is | |
264 | * passed in, and it must be checked or read if you need the data | |
265 | * inside it | |
266 | */ | |
267 | int (*process_func)(struct btrfs_root *log, struct extent_buffer *eb, | |
268 | struct walk_control *wc, u64 gen); | |
269 | }; | |
270 | ||
271 | /* | |
272 | * process_func used to pin down extents, write them or wait on them | |
273 | */ | |
274 | static int process_one_buffer(struct btrfs_root *log, | |
275 | struct extent_buffer *eb, | |
276 | struct walk_control *wc, u64 gen) | |
277 | { | |
04018de5 | 278 | if (wc->pin) |
11833d66 YZ |
279 | btrfs_pin_extent(log->fs_info->extent_root, |
280 | eb->start, eb->len, 0); | |
e02119d5 CM |
281 | |
282 | if (btrfs_buffer_uptodate(eb, gen)) { | |
283 | if (wc->write) | |
284 | btrfs_write_tree_block(eb); | |
285 | if (wc->wait) | |
286 | btrfs_wait_tree_block_writeback(eb); | |
287 | } | |
288 | return 0; | |
289 | } | |
290 | ||
291 | /* | |
292 | * Item overwrite used by replay and tree logging. eb, slot and key all refer | |
293 | * to the src data we are copying out. | |
294 | * | |
295 | * root is the tree we are copying into, and path is a scratch | |
296 | * path for use in this function (it should be released on entry and | |
297 | * will be released on exit). | |
298 | * | |
299 | * If the key is already in the destination tree the existing item is | |
300 | * overwritten. If the existing item isn't big enough, it is extended. | |
301 | * If it is too large, it is truncated. | |
302 | * | |
303 | * If the key isn't in the destination yet, a new item is inserted. | |
304 | */ | |
305 | static noinline int overwrite_item(struct btrfs_trans_handle *trans, | |
306 | struct btrfs_root *root, | |
307 | struct btrfs_path *path, | |
308 | struct extent_buffer *eb, int slot, | |
309 | struct btrfs_key *key) | |
310 | { | |
311 | int ret; | |
312 | u32 item_size; | |
313 | u64 saved_i_size = 0; | |
314 | int save_old_i_size = 0; | |
315 | unsigned long src_ptr; | |
316 | unsigned long dst_ptr; | |
317 | int overwrite_root = 0; | |
318 | ||
319 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
320 | overwrite_root = 1; | |
321 | ||
322 | item_size = btrfs_item_size_nr(eb, slot); | |
323 | src_ptr = btrfs_item_ptr_offset(eb, slot); | |
324 | ||
325 | /* look for the key in the destination tree */ | |
326 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); | |
327 | if (ret == 0) { | |
328 | char *src_copy; | |
329 | char *dst_copy; | |
330 | u32 dst_size = btrfs_item_size_nr(path->nodes[0], | |
331 | path->slots[0]); | |
332 | if (dst_size != item_size) | |
333 | goto insert; | |
334 | ||
335 | if (item_size == 0) { | |
b3b4aa74 | 336 | btrfs_release_path(path); |
e02119d5 CM |
337 | return 0; |
338 | } | |
339 | dst_copy = kmalloc(item_size, GFP_NOFS); | |
340 | src_copy = kmalloc(item_size, GFP_NOFS); | |
2a29edc6 | 341 | if (!dst_copy || !src_copy) { |
b3b4aa74 | 342 | btrfs_release_path(path); |
2a29edc6 | 343 | kfree(dst_copy); |
344 | kfree(src_copy); | |
345 | return -ENOMEM; | |
346 | } | |
e02119d5 CM |
347 | |
348 | read_extent_buffer(eb, src_copy, src_ptr, item_size); | |
349 | ||
350 | dst_ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); | |
351 | read_extent_buffer(path->nodes[0], dst_copy, dst_ptr, | |
352 | item_size); | |
353 | ret = memcmp(dst_copy, src_copy, item_size); | |
354 | ||
355 | kfree(dst_copy); | |
356 | kfree(src_copy); | |
357 | /* | |
358 | * they have the same contents, just return, this saves | |
359 | * us from cowing blocks in the destination tree and doing | |
360 | * extra writes that may not have been done by a previous | |
361 | * sync | |
362 | */ | |
363 | if (ret == 0) { | |
b3b4aa74 | 364 | btrfs_release_path(path); |
e02119d5 CM |
365 | return 0; |
366 | } | |
367 | ||
368 | } | |
369 | insert: | |
b3b4aa74 | 370 | btrfs_release_path(path); |
e02119d5 CM |
371 | /* try to insert the key into the destination tree */ |
372 | ret = btrfs_insert_empty_item(trans, root, path, | |
373 | key, item_size); | |
374 | ||
375 | /* make sure any existing item is the correct size */ | |
376 | if (ret == -EEXIST) { | |
377 | u32 found_size; | |
378 | found_size = btrfs_item_size_nr(path->nodes[0], | |
379 | path->slots[0]); | |
380 | if (found_size > item_size) { | |
381 | btrfs_truncate_item(trans, root, path, item_size, 1); | |
382 | } else if (found_size < item_size) { | |
87b29b20 YZ |
383 | ret = btrfs_extend_item(trans, root, path, |
384 | item_size - found_size); | |
e02119d5 CM |
385 | } |
386 | } else if (ret) { | |
4a500fd1 | 387 | return ret; |
e02119d5 CM |
388 | } |
389 | dst_ptr = btrfs_item_ptr_offset(path->nodes[0], | |
390 | path->slots[0]); | |
391 | ||
392 | /* don't overwrite an existing inode if the generation number | |
393 | * was logged as zero. This is done when the tree logging code | |
394 | * is just logging an inode to make sure it exists after recovery. | |
395 | * | |
396 | * Also, don't overwrite i_size on directories during replay. | |
397 | * log replay inserts and removes directory items based on the | |
398 | * state of the tree found in the subvolume, and i_size is modified | |
399 | * as it goes | |
400 | */ | |
401 | if (key->type == BTRFS_INODE_ITEM_KEY && ret == -EEXIST) { | |
402 | struct btrfs_inode_item *src_item; | |
403 | struct btrfs_inode_item *dst_item; | |
404 | ||
405 | src_item = (struct btrfs_inode_item *)src_ptr; | |
406 | dst_item = (struct btrfs_inode_item *)dst_ptr; | |
407 | ||
408 | if (btrfs_inode_generation(eb, src_item) == 0) | |
409 | goto no_copy; | |
410 | ||
411 | if (overwrite_root && | |
412 | S_ISDIR(btrfs_inode_mode(eb, src_item)) && | |
413 | S_ISDIR(btrfs_inode_mode(path->nodes[0], dst_item))) { | |
414 | save_old_i_size = 1; | |
415 | saved_i_size = btrfs_inode_size(path->nodes[0], | |
416 | dst_item); | |
417 | } | |
418 | } | |
419 | ||
420 | copy_extent_buffer(path->nodes[0], eb, dst_ptr, | |
421 | src_ptr, item_size); | |
422 | ||
423 | if (save_old_i_size) { | |
424 | struct btrfs_inode_item *dst_item; | |
425 | dst_item = (struct btrfs_inode_item *)dst_ptr; | |
426 | btrfs_set_inode_size(path->nodes[0], dst_item, saved_i_size); | |
427 | } | |
428 | ||
429 | /* make sure the generation is filled in */ | |
430 | if (key->type == BTRFS_INODE_ITEM_KEY) { | |
431 | struct btrfs_inode_item *dst_item; | |
432 | dst_item = (struct btrfs_inode_item *)dst_ptr; | |
433 | if (btrfs_inode_generation(path->nodes[0], dst_item) == 0) { | |
434 | btrfs_set_inode_generation(path->nodes[0], dst_item, | |
435 | trans->transid); | |
436 | } | |
437 | } | |
438 | no_copy: | |
439 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
b3b4aa74 | 440 | btrfs_release_path(path); |
e02119d5 CM |
441 | return 0; |
442 | } | |
443 | ||
444 | /* | |
445 | * simple helper to read an inode off the disk from a given root | |
446 | * This can only be called for subvolume roots and not for the log | |
447 | */ | |
448 | static noinline struct inode *read_one_inode(struct btrfs_root *root, | |
449 | u64 objectid) | |
450 | { | |
5d4f98a2 | 451 | struct btrfs_key key; |
e02119d5 | 452 | struct inode *inode; |
e02119d5 | 453 | |
5d4f98a2 YZ |
454 | key.objectid = objectid; |
455 | key.type = BTRFS_INODE_ITEM_KEY; | |
456 | key.offset = 0; | |
73f73415 | 457 | inode = btrfs_iget(root->fs_info->sb, &key, root, NULL); |
5d4f98a2 YZ |
458 | if (IS_ERR(inode)) { |
459 | inode = NULL; | |
460 | } else if (is_bad_inode(inode)) { | |
e02119d5 CM |
461 | iput(inode); |
462 | inode = NULL; | |
463 | } | |
464 | return inode; | |
465 | } | |
466 | ||
467 | /* replays a single extent in 'eb' at 'slot' with 'key' into the | |
468 | * subvolume 'root'. path is released on entry and should be released | |
469 | * on exit. | |
470 | * | |
471 | * extents in the log tree have not been allocated out of the extent | |
472 | * tree yet. So, this completes the allocation, taking a reference | |
473 | * as required if the extent already exists or creating a new extent | |
474 | * if it isn't in the extent allocation tree yet. | |
475 | * | |
476 | * The extent is inserted into the file, dropping any existing extents | |
477 | * from the file that overlap the new one. | |
478 | */ | |
479 | static noinline int replay_one_extent(struct btrfs_trans_handle *trans, | |
480 | struct btrfs_root *root, | |
481 | struct btrfs_path *path, | |
482 | struct extent_buffer *eb, int slot, | |
483 | struct btrfs_key *key) | |
484 | { | |
485 | int found_type; | |
486 | u64 mask = root->sectorsize - 1; | |
487 | u64 extent_end; | |
488 | u64 alloc_hint; | |
489 | u64 start = key->offset; | |
07d400a6 | 490 | u64 saved_nbytes; |
e02119d5 CM |
491 | struct btrfs_file_extent_item *item; |
492 | struct inode *inode = NULL; | |
493 | unsigned long size; | |
494 | int ret = 0; | |
495 | ||
496 | item = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item); | |
497 | found_type = btrfs_file_extent_type(eb, item); | |
498 | ||
d899e052 YZ |
499 | if (found_type == BTRFS_FILE_EXTENT_REG || |
500 | found_type == BTRFS_FILE_EXTENT_PREALLOC) | |
e02119d5 CM |
501 | extent_end = start + btrfs_file_extent_num_bytes(eb, item); |
502 | else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
c8b97818 | 503 | size = btrfs_file_extent_inline_len(eb, item); |
e02119d5 CM |
504 | extent_end = (start + size + mask) & ~mask; |
505 | } else { | |
506 | ret = 0; | |
507 | goto out; | |
508 | } | |
509 | ||
510 | inode = read_one_inode(root, key->objectid); | |
511 | if (!inode) { | |
512 | ret = -EIO; | |
513 | goto out; | |
514 | } | |
515 | ||
516 | /* | |
517 | * first check to see if we already have this extent in the | |
518 | * file. This must be done before the btrfs_drop_extents run | |
519 | * so we don't try to drop this extent. | |
520 | */ | |
33345d01 | 521 | ret = btrfs_lookup_file_extent(trans, root, path, btrfs_ino(inode), |
e02119d5 CM |
522 | start, 0); |
523 | ||
d899e052 YZ |
524 | if (ret == 0 && |
525 | (found_type == BTRFS_FILE_EXTENT_REG || | |
526 | found_type == BTRFS_FILE_EXTENT_PREALLOC)) { | |
e02119d5 CM |
527 | struct btrfs_file_extent_item cmp1; |
528 | struct btrfs_file_extent_item cmp2; | |
529 | struct btrfs_file_extent_item *existing; | |
530 | struct extent_buffer *leaf; | |
531 | ||
532 | leaf = path->nodes[0]; | |
533 | existing = btrfs_item_ptr(leaf, path->slots[0], | |
534 | struct btrfs_file_extent_item); | |
535 | ||
536 | read_extent_buffer(eb, &cmp1, (unsigned long)item, | |
537 | sizeof(cmp1)); | |
538 | read_extent_buffer(leaf, &cmp2, (unsigned long)existing, | |
539 | sizeof(cmp2)); | |
540 | ||
541 | /* | |
542 | * we already have a pointer to this exact extent, | |
543 | * we don't have to do anything | |
544 | */ | |
545 | if (memcmp(&cmp1, &cmp2, sizeof(cmp1)) == 0) { | |
b3b4aa74 | 546 | btrfs_release_path(path); |
e02119d5 CM |
547 | goto out; |
548 | } | |
549 | } | |
b3b4aa74 | 550 | btrfs_release_path(path); |
e02119d5 | 551 | |
07d400a6 | 552 | saved_nbytes = inode_get_bytes(inode); |
e02119d5 | 553 | /* drop any overlapping extents */ |
920bbbfb YZ |
554 | ret = btrfs_drop_extents(trans, inode, start, extent_end, |
555 | &alloc_hint, 1); | |
e02119d5 CM |
556 | BUG_ON(ret); |
557 | ||
07d400a6 YZ |
558 | if (found_type == BTRFS_FILE_EXTENT_REG || |
559 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
5d4f98a2 | 560 | u64 offset; |
07d400a6 YZ |
561 | unsigned long dest_offset; |
562 | struct btrfs_key ins; | |
563 | ||
564 | ret = btrfs_insert_empty_item(trans, root, path, key, | |
565 | sizeof(*item)); | |
566 | BUG_ON(ret); | |
567 | dest_offset = btrfs_item_ptr_offset(path->nodes[0], | |
568 | path->slots[0]); | |
569 | copy_extent_buffer(path->nodes[0], eb, dest_offset, | |
570 | (unsigned long)item, sizeof(*item)); | |
571 | ||
572 | ins.objectid = btrfs_file_extent_disk_bytenr(eb, item); | |
573 | ins.offset = btrfs_file_extent_disk_num_bytes(eb, item); | |
574 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
5d4f98a2 | 575 | offset = key->offset - btrfs_file_extent_offset(eb, item); |
07d400a6 YZ |
576 | |
577 | if (ins.objectid > 0) { | |
578 | u64 csum_start; | |
579 | u64 csum_end; | |
580 | LIST_HEAD(ordered_sums); | |
581 | /* | |
582 | * is this extent already allocated in the extent | |
583 | * allocation tree? If so, just add a reference | |
584 | */ | |
585 | ret = btrfs_lookup_extent(root, ins.objectid, | |
586 | ins.offset); | |
587 | if (ret == 0) { | |
588 | ret = btrfs_inc_extent_ref(trans, root, | |
589 | ins.objectid, ins.offset, | |
5d4f98a2 YZ |
590 | 0, root->root_key.objectid, |
591 | key->objectid, offset); | |
37daa4f9 | 592 | BUG_ON(ret); |
07d400a6 YZ |
593 | } else { |
594 | /* | |
595 | * insert the extent pointer in the extent | |
596 | * allocation tree | |
597 | */ | |
5d4f98a2 YZ |
598 | ret = btrfs_alloc_logged_file_extent(trans, |
599 | root, root->root_key.objectid, | |
600 | key->objectid, offset, &ins); | |
07d400a6 YZ |
601 | BUG_ON(ret); |
602 | } | |
b3b4aa74 | 603 | btrfs_release_path(path); |
07d400a6 YZ |
604 | |
605 | if (btrfs_file_extent_compression(eb, item)) { | |
606 | csum_start = ins.objectid; | |
607 | csum_end = csum_start + ins.offset; | |
608 | } else { | |
609 | csum_start = ins.objectid + | |
610 | btrfs_file_extent_offset(eb, item); | |
611 | csum_end = csum_start + | |
612 | btrfs_file_extent_num_bytes(eb, item); | |
613 | } | |
614 | ||
615 | ret = btrfs_lookup_csums_range(root->log_root, | |
616 | csum_start, csum_end - 1, | |
a2de733c | 617 | &ordered_sums, 0); |
07d400a6 YZ |
618 | BUG_ON(ret); |
619 | while (!list_empty(&ordered_sums)) { | |
620 | struct btrfs_ordered_sum *sums; | |
621 | sums = list_entry(ordered_sums.next, | |
622 | struct btrfs_ordered_sum, | |
623 | list); | |
624 | ret = btrfs_csum_file_blocks(trans, | |
625 | root->fs_info->csum_root, | |
626 | sums); | |
627 | BUG_ON(ret); | |
628 | list_del(&sums->list); | |
629 | kfree(sums); | |
630 | } | |
631 | } else { | |
b3b4aa74 | 632 | btrfs_release_path(path); |
07d400a6 YZ |
633 | } |
634 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
635 | /* inline extents are easy, we just overwrite them */ | |
636 | ret = overwrite_item(trans, root, path, eb, slot, key); | |
637 | BUG_ON(ret); | |
638 | } | |
e02119d5 | 639 | |
07d400a6 | 640 | inode_set_bytes(inode, saved_nbytes); |
e02119d5 CM |
641 | btrfs_update_inode(trans, root, inode); |
642 | out: | |
643 | if (inode) | |
644 | iput(inode); | |
645 | return ret; | |
646 | } | |
647 | ||
648 | /* | |
649 | * when cleaning up conflicts between the directory names in the | |
650 | * subvolume, directory names in the log and directory names in the | |
651 | * inode back references, we may have to unlink inodes from directories. | |
652 | * | |
653 | * This is a helper function to do the unlink of a specific directory | |
654 | * item | |
655 | */ | |
656 | static noinline int drop_one_dir_item(struct btrfs_trans_handle *trans, | |
657 | struct btrfs_root *root, | |
658 | struct btrfs_path *path, | |
659 | struct inode *dir, | |
660 | struct btrfs_dir_item *di) | |
661 | { | |
662 | struct inode *inode; | |
663 | char *name; | |
664 | int name_len; | |
665 | struct extent_buffer *leaf; | |
666 | struct btrfs_key location; | |
667 | int ret; | |
668 | ||
669 | leaf = path->nodes[0]; | |
670 | ||
671 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
672 | name_len = btrfs_dir_name_len(leaf, di); | |
673 | name = kmalloc(name_len, GFP_NOFS); | |
2a29edc6 | 674 | if (!name) |
675 | return -ENOMEM; | |
676 | ||
e02119d5 | 677 | read_extent_buffer(leaf, name, (unsigned long)(di + 1), name_len); |
b3b4aa74 | 678 | btrfs_release_path(path); |
e02119d5 CM |
679 | |
680 | inode = read_one_inode(root, location.objectid); | |
c00e9493 TI |
681 | if (!inode) { |
682 | kfree(name); | |
683 | return -EIO; | |
684 | } | |
e02119d5 | 685 | |
ec051c0f YZ |
686 | ret = link_to_fixup_dir(trans, root, path, location.objectid); |
687 | BUG_ON(ret); | |
12fcfd22 | 688 | |
e02119d5 | 689 | ret = btrfs_unlink_inode(trans, root, dir, inode, name, name_len); |
ec051c0f | 690 | BUG_ON(ret); |
e02119d5 CM |
691 | kfree(name); |
692 | ||
693 | iput(inode); | |
694 | return ret; | |
695 | } | |
696 | ||
697 | /* | |
698 | * helper function to see if a given name and sequence number found | |
699 | * in an inode back reference are already in a directory and correctly | |
700 | * point to this inode | |
701 | */ | |
702 | static noinline int inode_in_dir(struct btrfs_root *root, | |
703 | struct btrfs_path *path, | |
704 | u64 dirid, u64 objectid, u64 index, | |
705 | const char *name, int name_len) | |
706 | { | |
707 | struct btrfs_dir_item *di; | |
708 | struct btrfs_key location; | |
709 | int match = 0; | |
710 | ||
711 | di = btrfs_lookup_dir_index_item(NULL, root, path, dirid, | |
712 | index, name, name_len, 0); | |
713 | if (di && !IS_ERR(di)) { | |
714 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
715 | if (location.objectid != objectid) | |
716 | goto out; | |
717 | } else | |
718 | goto out; | |
b3b4aa74 | 719 | btrfs_release_path(path); |
e02119d5 CM |
720 | |
721 | di = btrfs_lookup_dir_item(NULL, root, path, dirid, name, name_len, 0); | |
722 | if (di && !IS_ERR(di)) { | |
723 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
724 | if (location.objectid != objectid) | |
725 | goto out; | |
726 | } else | |
727 | goto out; | |
728 | match = 1; | |
729 | out: | |
b3b4aa74 | 730 | btrfs_release_path(path); |
e02119d5 CM |
731 | return match; |
732 | } | |
733 | ||
734 | /* | |
735 | * helper function to check a log tree for a named back reference in | |
736 | * an inode. This is used to decide if a back reference that is | |
737 | * found in the subvolume conflicts with what we find in the log. | |
738 | * | |
739 | * inode backreferences may have multiple refs in a single item, | |
740 | * during replay we process one reference at a time, and we don't | |
741 | * want to delete valid links to a file from the subvolume if that | |
742 | * link is also in the log. | |
743 | */ | |
744 | static noinline int backref_in_log(struct btrfs_root *log, | |
745 | struct btrfs_key *key, | |
746 | char *name, int namelen) | |
747 | { | |
748 | struct btrfs_path *path; | |
749 | struct btrfs_inode_ref *ref; | |
750 | unsigned long ptr; | |
751 | unsigned long ptr_end; | |
752 | unsigned long name_ptr; | |
753 | int found_name_len; | |
754 | int item_size; | |
755 | int ret; | |
756 | int match = 0; | |
757 | ||
758 | path = btrfs_alloc_path(); | |
2a29edc6 | 759 | if (!path) |
760 | return -ENOMEM; | |
761 | ||
e02119d5 CM |
762 | ret = btrfs_search_slot(NULL, log, key, path, 0, 0); |
763 | if (ret != 0) | |
764 | goto out; | |
765 | ||
766 | item_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]); | |
767 | ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); | |
768 | ptr_end = ptr + item_size; | |
769 | while (ptr < ptr_end) { | |
770 | ref = (struct btrfs_inode_ref *)ptr; | |
771 | found_name_len = btrfs_inode_ref_name_len(path->nodes[0], ref); | |
772 | if (found_name_len == namelen) { | |
773 | name_ptr = (unsigned long)(ref + 1); | |
774 | ret = memcmp_extent_buffer(path->nodes[0], name, | |
775 | name_ptr, namelen); | |
776 | if (ret == 0) { | |
777 | match = 1; | |
778 | goto out; | |
779 | } | |
780 | } | |
781 | ptr = (unsigned long)(ref + 1) + found_name_len; | |
782 | } | |
783 | out: | |
784 | btrfs_free_path(path); | |
785 | return match; | |
786 | } | |
787 | ||
788 | ||
789 | /* | |
790 | * replay one inode back reference item found in the log tree. | |
791 | * eb, slot and key refer to the buffer and key found in the log tree. | |
792 | * root is the destination we are replaying into, and path is for temp | |
793 | * use by this function. (it should be released on return). | |
794 | */ | |
795 | static noinline int add_inode_ref(struct btrfs_trans_handle *trans, | |
796 | struct btrfs_root *root, | |
797 | struct btrfs_root *log, | |
798 | struct btrfs_path *path, | |
799 | struct extent_buffer *eb, int slot, | |
800 | struct btrfs_key *key) | |
801 | { | |
802 | struct inode *dir; | |
803 | int ret; | |
e02119d5 | 804 | struct btrfs_inode_ref *ref; |
e02119d5 CM |
805 | struct inode *inode; |
806 | char *name; | |
807 | int namelen; | |
808 | unsigned long ref_ptr; | |
809 | unsigned long ref_end; | |
c622ae60 | 810 | int search_done = 0; |
e02119d5 | 811 | |
e02119d5 CM |
812 | /* |
813 | * it is possible that we didn't log all the parent directories | |
814 | * for a given inode. If we don't find the dir, just don't | |
815 | * copy the back ref in. The link count fixup code will take | |
816 | * care of the rest | |
817 | */ | |
818 | dir = read_one_inode(root, key->offset); | |
819 | if (!dir) | |
820 | return -ENOENT; | |
821 | ||
822 | inode = read_one_inode(root, key->objectid); | |
c00e9493 TI |
823 | if (!inode) { |
824 | iput(dir); | |
825 | return -EIO; | |
826 | } | |
e02119d5 CM |
827 | |
828 | ref_ptr = btrfs_item_ptr_offset(eb, slot); | |
829 | ref_end = ref_ptr + btrfs_item_size_nr(eb, slot); | |
830 | ||
831 | again: | |
832 | ref = (struct btrfs_inode_ref *)ref_ptr; | |
833 | ||
834 | namelen = btrfs_inode_ref_name_len(eb, ref); | |
835 | name = kmalloc(namelen, GFP_NOFS); | |
836 | BUG_ON(!name); | |
837 | ||
838 | read_extent_buffer(eb, name, (unsigned long)(ref + 1), namelen); | |
839 | ||
840 | /* if we already have a perfect match, we're done */ | |
33345d01 | 841 | if (inode_in_dir(root, path, btrfs_ino(dir), btrfs_ino(inode), |
e02119d5 CM |
842 | btrfs_inode_ref_index(eb, ref), |
843 | name, namelen)) { | |
844 | goto out; | |
845 | } | |
846 | ||
847 | /* | |
848 | * look for a conflicting back reference in the metadata. | |
849 | * if we find one we have to unlink that name of the file | |
850 | * before we add our new link. Later on, we overwrite any | |
851 | * existing back reference, and we don't want to create | |
852 | * dangling pointers in the directory. | |
853 | */ | |
c622ae60 | 854 | |
855 | if (search_done) | |
856 | goto insert; | |
857 | ||
e02119d5 CM |
858 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); |
859 | if (ret == 0) { | |
860 | char *victim_name; | |
861 | int victim_name_len; | |
862 | struct btrfs_inode_ref *victim_ref; | |
863 | unsigned long ptr; | |
864 | unsigned long ptr_end; | |
865 | struct extent_buffer *leaf = path->nodes[0]; | |
866 | ||
867 | /* are we trying to overwrite a back ref for the root directory | |
868 | * if so, just jump out, we're done | |
869 | */ | |
870 | if (key->objectid == key->offset) | |
871 | goto out_nowrite; | |
872 | ||
873 | /* check all the names in this back reference to see | |
874 | * if they are in the log. if so, we allow them to stay | |
875 | * otherwise they must be unlinked as a conflict | |
876 | */ | |
877 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
878 | ptr_end = ptr + btrfs_item_size_nr(leaf, path->slots[0]); | |
d397712b | 879 | while (ptr < ptr_end) { |
e02119d5 CM |
880 | victim_ref = (struct btrfs_inode_ref *)ptr; |
881 | victim_name_len = btrfs_inode_ref_name_len(leaf, | |
882 | victim_ref); | |
883 | victim_name = kmalloc(victim_name_len, GFP_NOFS); | |
884 | BUG_ON(!victim_name); | |
885 | ||
886 | read_extent_buffer(leaf, victim_name, | |
887 | (unsigned long)(victim_ref + 1), | |
888 | victim_name_len); | |
889 | ||
890 | if (!backref_in_log(log, key, victim_name, | |
891 | victim_name_len)) { | |
892 | btrfs_inc_nlink(inode); | |
b3b4aa74 | 893 | btrfs_release_path(path); |
12fcfd22 | 894 | |
e02119d5 CM |
895 | ret = btrfs_unlink_inode(trans, root, dir, |
896 | inode, victim_name, | |
897 | victim_name_len); | |
e02119d5 CM |
898 | } |
899 | kfree(victim_name); | |
900 | ptr = (unsigned long)(victim_ref + 1) + victim_name_len; | |
901 | } | |
902 | BUG_ON(ret); | |
e02119d5 | 903 | |
c622ae60 | 904 | /* |
905 | * NOTE: we have searched root tree and checked the | |
906 | * coresponding ref, it does not need to check again. | |
907 | */ | |
908 | search_done = 1; | |
e02119d5 | 909 | } |
b3b4aa74 | 910 | btrfs_release_path(path); |
e02119d5 | 911 | |
c622ae60 | 912 | insert: |
e02119d5 CM |
913 | /* insert our name */ |
914 | ret = btrfs_add_link(trans, dir, inode, name, namelen, 0, | |
915 | btrfs_inode_ref_index(eb, ref)); | |
916 | BUG_ON(ret); | |
917 | ||
918 | btrfs_update_inode(trans, root, inode); | |
919 | ||
920 | out: | |
921 | ref_ptr = (unsigned long)(ref + 1) + namelen; | |
922 | kfree(name); | |
923 | if (ref_ptr < ref_end) | |
924 | goto again; | |
925 | ||
926 | /* finally write the back reference in the inode */ | |
927 | ret = overwrite_item(trans, root, path, eb, slot, key); | |
928 | BUG_ON(ret); | |
929 | ||
930 | out_nowrite: | |
b3b4aa74 | 931 | btrfs_release_path(path); |
e02119d5 CM |
932 | iput(dir); |
933 | iput(inode); | |
934 | return 0; | |
935 | } | |
936 | ||
c71bf099 YZ |
937 | static int insert_orphan_item(struct btrfs_trans_handle *trans, |
938 | struct btrfs_root *root, u64 offset) | |
939 | { | |
940 | int ret; | |
941 | ret = btrfs_find_orphan_item(root, offset); | |
942 | if (ret > 0) | |
943 | ret = btrfs_insert_orphan_item(trans, root, offset); | |
944 | return ret; | |
945 | } | |
946 | ||
947 | ||
e02119d5 CM |
948 | /* |
949 | * There are a few corners where the link count of the file can't | |
950 | * be properly maintained during replay. So, instead of adding | |
951 | * lots of complexity to the log code, we just scan the backrefs | |
952 | * for any file that has been through replay. | |
953 | * | |
954 | * The scan will update the link count on the inode to reflect the | |
955 | * number of back refs found. If it goes down to zero, the iput | |
956 | * will free the inode. | |
957 | */ | |
958 | static noinline int fixup_inode_link_count(struct btrfs_trans_handle *trans, | |
959 | struct btrfs_root *root, | |
960 | struct inode *inode) | |
961 | { | |
962 | struct btrfs_path *path; | |
963 | int ret; | |
964 | struct btrfs_key key; | |
965 | u64 nlink = 0; | |
966 | unsigned long ptr; | |
967 | unsigned long ptr_end; | |
968 | int name_len; | |
33345d01 | 969 | u64 ino = btrfs_ino(inode); |
e02119d5 | 970 | |
33345d01 | 971 | key.objectid = ino; |
e02119d5 CM |
972 | key.type = BTRFS_INODE_REF_KEY; |
973 | key.offset = (u64)-1; | |
974 | ||
975 | path = btrfs_alloc_path(); | |
2a29edc6 | 976 | if (!path) |
977 | return -ENOMEM; | |
e02119d5 | 978 | |
d397712b | 979 | while (1) { |
e02119d5 CM |
980 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
981 | if (ret < 0) | |
982 | break; | |
983 | if (ret > 0) { | |
984 | if (path->slots[0] == 0) | |
985 | break; | |
986 | path->slots[0]--; | |
987 | } | |
988 | btrfs_item_key_to_cpu(path->nodes[0], &key, | |
989 | path->slots[0]); | |
33345d01 | 990 | if (key.objectid != ino || |
e02119d5 CM |
991 | key.type != BTRFS_INODE_REF_KEY) |
992 | break; | |
993 | ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); | |
994 | ptr_end = ptr + btrfs_item_size_nr(path->nodes[0], | |
995 | path->slots[0]); | |
d397712b | 996 | while (ptr < ptr_end) { |
e02119d5 CM |
997 | struct btrfs_inode_ref *ref; |
998 | ||
999 | ref = (struct btrfs_inode_ref *)ptr; | |
1000 | name_len = btrfs_inode_ref_name_len(path->nodes[0], | |
1001 | ref); | |
1002 | ptr = (unsigned long)(ref + 1) + name_len; | |
1003 | nlink++; | |
1004 | } | |
1005 | ||
1006 | if (key.offset == 0) | |
1007 | break; | |
1008 | key.offset--; | |
b3b4aa74 | 1009 | btrfs_release_path(path); |
e02119d5 | 1010 | } |
b3b4aa74 | 1011 | btrfs_release_path(path); |
e02119d5 CM |
1012 | if (nlink != inode->i_nlink) { |
1013 | inode->i_nlink = nlink; | |
1014 | btrfs_update_inode(trans, root, inode); | |
1015 | } | |
8d5bf1cb | 1016 | BTRFS_I(inode)->index_cnt = (u64)-1; |
e02119d5 | 1017 | |
c71bf099 YZ |
1018 | if (inode->i_nlink == 0) { |
1019 | if (S_ISDIR(inode->i_mode)) { | |
1020 | ret = replay_dir_deletes(trans, root, NULL, path, | |
33345d01 | 1021 | ino, 1); |
c71bf099 YZ |
1022 | BUG_ON(ret); |
1023 | } | |
33345d01 | 1024 | ret = insert_orphan_item(trans, root, ino); |
12fcfd22 CM |
1025 | BUG_ON(ret); |
1026 | } | |
1027 | btrfs_free_path(path); | |
1028 | ||
e02119d5 CM |
1029 | return 0; |
1030 | } | |
1031 | ||
1032 | static noinline int fixup_inode_link_counts(struct btrfs_trans_handle *trans, | |
1033 | struct btrfs_root *root, | |
1034 | struct btrfs_path *path) | |
1035 | { | |
1036 | int ret; | |
1037 | struct btrfs_key key; | |
1038 | struct inode *inode; | |
1039 | ||
1040 | key.objectid = BTRFS_TREE_LOG_FIXUP_OBJECTID; | |
1041 | key.type = BTRFS_ORPHAN_ITEM_KEY; | |
1042 | key.offset = (u64)-1; | |
d397712b | 1043 | while (1) { |
e02119d5 CM |
1044 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1045 | if (ret < 0) | |
1046 | break; | |
1047 | ||
1048 | if (ret == 1) { | |
1049 | if (path->slots[0] == 0) | |
1050 | break; | |
1051 | path->slots[0]--; | |
1052 | } | |
1053 | ||
1054 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1055 | if (key.objectid != BTRFS_TREE_LOG_FIXUP_OBJECTID || | |
1056 | key.type != BTRFS_ORPHAN_ITEM_KEY) | |
1057 | break; | |
1058 | ||
1059 | ret = btrfs_del_item(trans, root, path); | |
65a246c5 TI |
1060 | if (ret) |
1061 | goto out; | |
e02119d5 | 1062 | |
b3b4aa74 | 1063 | btrfs_release_path(path); |
e02119d5 | 1064 | inode = read_one_inode(root, key.offset); |
c00e9493 TI |
1065 | if (!inode) |
1066 | return -EIO; | |
e02119d5 CM |
1067 | |
1068 | ret = fixup_inode_link_count(trans, root, inode); | |
1069 | BUG_ON(ret); | |
1070 | ||
1071 | iput(inode); | |
1072 | ||
12fcfd22 CM |
1073 | /* |
1074 | * fixup on a directory may create new entries, | |
1075 | * make sure we always look for the highset possible | |
1076 | * offset | |
1077 | */ | |
1078 | key.offset = (u64)-1; | |
e02119d5 | 1079 | } |
65a246c5 TI |
1080 | ret = 0; |
1081 | out: | |
b3b4aa74 | 1082 | btrfs_release_path(path); |
65a246c5 | 1083 | return ret; |
e02119d5 CM |
1084 | } |
1085 | ||
1086 | ||
1087 | /* | |
1088 | * record a given inode in the fixup dir so we can check its link | |
1089 | * count when replay is done. The link count is incremented here | |
1090 | * so the inode won't go away until we check it | |
1091 | */ | |
1092 | static noinline int link_to_fixup_dir(struct btrfs_trans_handle *trans, | |
1093 | struct btrfs_root *root, | |
1094 | struct btrfs_path *path, | |
1095 | u64 objectid) | |
1096 | { | |
1097 | struct btrfs_key key; | |
1098 | int ret = 0; | |
1099 | struct inode *inode; | |
1100 | ||
1101 | inode = read_one_inode(root, objectid); | |
c00e9493 TI |
1102 | if (!inode) |
1103 | return -EIO; | |
e02119d5 CM |
1104 | |
1105 | key.objectid = BTRFS_TREE_LOG_FIXUP_OBJECTID; | |
1106 | btrfs_set_key_type(&key, BTRFS_ORPHAN_ITEM_KEY); | |
1107 | key.offset = objectid; | |
1108 | ||
1109 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
1110 | ||
b3b4aa74 | 1111 | btrfs_release_path(path); |
e02119d5 CM |
1112 | if (ret == 0) { |
1113 | btrfs_inc_nlink(inode); | |
1114 | btrfs_update_inode(trans, root, inode); | |
1115 | } else if (ret == -EEXIST) { | |
1116 | ret = 0; | |
1117 | } else { | |
1118 | BUG(); | |
1119 | } | |
1120 | iput(inode); | |
1121 | ||
1122 | return ret; | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * when replaying the log for a directory, we only insert names | |
1127 | * for inodes that actually exist. This means an fsync on a directory | |
1128 | * does not implicitly fsync all the new files in it | |
1129 | */ | |
1130 | static noinline int insert_one_name(struct btrfs_trans_handle *trans, | |
1131 | struct btrfs_root *root, | |
1132 | struct btrfs_path *path, | |
1133 | u64 dirid, u64 index, | |
1134 | char *name, int name_len, u8 type, | |
1135 | struct btrfs_key *location) | |
1136 | { | |
1137 | struct inode *inode; | |
1138 | struct inode *dir; | |
1139 | int ret; | |
1140 | ||
1141 | inode = read_one_inode(root, location->objectid); | |
1142 | if (!inode) | |
1143 | return -ENOENT; | |
1144 | ||
1145 | dir = read_one_inode(root, dirid); | |
1146 | if (!dir) { | |
1147 | iput(inode); | |
1148 | return -EIO; | |
1149 | } | |
1150 | ret = btrfs_add_link(trans, dir, inode, name, name_len, 1, index); | |
1151 | ||
1152 | /* FIXME, put inode into FIXUP list */ | |
1153 | ||
1154 | iput(inode); | |
1155 | iput(dir); | |
1156 | return ret; | |
1157 | } | |
1158 | ||
1159 | /* | |
1160 | * take a single entry in a log directory item and replay it into | |
1161 | * the subvolume. | |
1162 | * | |
1163 | * if a conflicting item exists in the subdirectory already, | |
1164 | * the inode it points to is unlinked and put into the link count | |
1165 | * fix up tree. | |
1166 | * | |
1167 | * If a name from the log points to a file or directory that does | |
1168 | * not exist in the FS, it is skipped. fsyncs on directories | |
1169 | * do not force down inodes inside that directory, just changes to the | |
1170 | * names or unlinks in a directory. | |
1171 | */ | |
1172 | static noinline int replay_one_name(struct btrfs_trans_handle *trans, | |
1173 | struct btrfs_root *root, | |
1174 | struct btrfs_path *path, | |
1175 | struct extent_buffer *eb, | |
1176 | struct btrfs_dir_item *di, | |
1177 | struct btrfs_key *key) | |
1178 | { | |
1179 | char *name; | |
1180 | int name_len; | |
1181 | struct btrfs_dir_item *dst_di; | |
1182 | struct btrfs_key found_key; | |
1183 | struct btrfs_key log_key; | |
1184 | struct inode *dir; | |
e02119d5 | 1185 | u8 log_type; |
4bef0848 | 1186 | int exists; |
e02119d5 CM |
1187 | int ret; |
1188 | ||
1189 | dir = read_one_inode(root, key->objectid); | |
c00e9493 TI |
1190 | if (!dir) |
1191 | return -EIO; | |
e02119d5 CM |
1192 | |
1193 | name_len = btrfs_dir_name_len(eb, di); | |
1194 | name = kmalloc(name_len, GFP_NOFS); | |
2a29edc6 | 1195 | if (!name) |
1196 | return -ENOMEM; | |
1197 | ||
e02119d5 CM |
1198 | log_type = btrfs_dir_type(eb, di); |
1199 | read_extent_buffer(eb, name, (unsigned long)(di + 1), | |
1200 | name_len); | |
1201 | ||
1202 | btrfs_dir_item_key_to_cpu(eb, di, &log_key); | |
4bef0848 CM |
1203 | exists = btrfs_lookup_inode(trans, root, path, &log_key, 0); |
1204 | if (exists == 0) | |
1205 | exists = 1; | |
1206 | else | |
1207 | exists = 0; | |
b3b4aa74 | 1208 | btrfs_release_path(path); |
4bef0848 | 1209 | |
e02119d5 CM |
1210 | if (key->type == BTRFS_DIR_ITEM_KEY) { |
1211 | dst_di = btrfs_lookup_dir_item(trans, root, path, key->objectid, | |
1212 | name, name_len, 1); | |
d397712b | 1213 | } else if (key->type == BTRFS_DIR_INDEX_KEY) { |
e02119d5 CM |
1214 | dst_di = btrfs_lookup_dir_index_item(trans, root, path, |
1215 | key->objectid, | |
1216 | key->offset, name, | |
1217 | name_len, 1); | |
1218 | } else { | |
1219 | BUG(); | |
1220 | } | |
c704005d | 1221 | if (IS_ERR_OR_NULL(dst_di)) { |
e02119d5 CM |
1222 | /* we need a sequence number to insert, so we only |
1223 | * do inserts for the BTRFS_DIR_INDEX_KEY types | |
1224 | */ | |
1225 | if (key->type != BTRFS_DIR_INDEX_KEY) | |
1226 | goto out; | |
1227 | goto insert; | |
1228 | } | |
1229 | ||
1230 | btrfs_dir_item_key_to_cpu(path->nodes[0], dst_di, &found_key); | |
1231 | /* the existing item matches the logged item */ | |
1232 | if (found_key.objectid == log_key.objectid && | |
1233 | found_key.type == log_key.type && | |
1234 | found_key.offset == log_key.offset && | |
1235 | btrfs_dir_type(path->nodes[0], dst_di) == log_type) { | |
1236 | goto out; | |
1237 | } | |
1238 | ||
1239 | /* | |
1240 | * don't drop the conflicting directory entry if the inode | |
1241 | * for the new entry doesn't exist | |
1242 | */ | |
4bef0848 | 1243 | if (!exists) |
e02119d5 CM |
1244 | goto out; |
1245 | ||
e02119d5 CM |
1246 | ret = drop_one_dir_item(trans, root, path, dir, dst_di); |
1247 | BUG_ON(ret); | |
1248 | ||
1249 | if (key->type == BTRFS_DIR_INDEX_KEY) | |
1250 | goto insert; | |
1251 | out: | |
b3b4aa74 | 1252 | btrfs_release_path(path); |
e02119d5 CM |
1253 | kfree(name); |
1254 | iput(dir); | |
1255 | return 0; | |
1256 | ||
1257 | insert: | |
b3b4aa74 | 1258 | btrfs_release_path(path); |
e02119d5 CM |
1259 | ret = insert_one_name(trans, root, path, key->objectid, key->offset, |
1260 | name, name_len, log_type, &log_key); | |
1261 | ||
c293498b | 1262 | BUG_ON(ret && ret != -ENOENT); |
e02119d5 CM |
1263 | goto out; |
1264 | } | |
1265 | ||
1266 | /* | |
1267 | * find all the names in a directory item and reconcile them into | |
1268 | * the subvolume. Only BTRFS_DIR_ITEM_KEY types will have more than | |
1269 | * one name in a directory item, but the same code gets used for | |
1270 | * both directory index types | |
1271 | */ | |
1272 | static noinline int replay_one_dir_item(struct btrfs_trans_handle *trans, | |
1273 | struct btrfs_root *root, | |
1274 | struct btrfs_path *path, | |
1275 | struct extent_buffer *eb, int slot, | |
1276 | struct btrfs_key *key) | |
1277 | { | |
1278 | int ret; | |
1279 | u32 item_size = btrfs_item_size_nr(eb, slot); | |
1280 | struct btrfs_dir_item *di; | |
1281 | int name_len; | |
1282 | unsigned long ptr; | |
1283 | unsigned long ptr_end; | |
1284 | ||
1285 | ptr = btrfs_item_ptr_offset(eb, slot); | |
1286 | ptr_end = ptr + item_size; | |
d397712b | 1287 | while (ptr < ptr_end) { |
e02119d5 | 1288 | di = (struct btrfs_dir_item *)ptr; |
22a94d44 JB |
1289 | if (verify_dir_item(root, eb, di)) |
1290 | return -EIO; | |
e02119d5 CM |
1291 | name_len = btrfs_dir_name_len(eb, di); |
1292 | ret = replay_one_name(trans, root, path, eb, di, key); | |
1293 | BUG_ON(ret); | |
1294 | ptr = (unsigned long)(di + 1); | |
1295 | ptr += name_len; | |
1296 | } | |
1297 | return 0; | |
1298 | } | |
1299 | ||
1300 | /* | |
1301 | * directory replay has two parts. There are the standard directory | |
1302 | * items in the log copied from the subvolume, and range items | |
1303 | * created in the log while the subvolume was logged. | |
1304 | * | |
1305 | * The range items tell us which parts of the key space the log | |
1306 | * is authoritative for. During replay, if a key in the subvolume | |
1307 | * directory is in a logged range item, but not actually in the log | |
1308 | * that means it was deleted from the directory before the fsync | |
1309 | * and should be removed. | |
1310 | */ | |
1311 | static noinline int find_dir_range(struct btrfs_root *root, | |
1312 | struct btrfs_path *path, | |
1313 | u64 dirid, int key_type, | |
1314 | u64 *start_ret, u64 *end_ret) | |
1315 | { | |
1316 | struct btrfs_key key; | |
1317 | u64 found_end; | |
1318 | struct btrfs_dir_log_item *item; | |
1319 | int ret; | |
1320 | int nritems; | |
1321 | ||
1322 | if (*start_ret == (u64)-1) | |
1323 | return 1; | |
1324 | ||
1325 | key.objectid = dirid; | |
1326 | key.type = key_type; | |
1327 | key.offset = *start_ret; | |
1328 | ||
1329 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
1330 | if (ret < 0) | |
1331 | goto out; | |
1332 | if (ret > 0) { | |
1333 | if (path->slots[0] == 0) | |
1334 | goto out; | |
1335 | path->slots[0]--; | |
1336 | } | |
1337 | if (ret != 0) | |
1338 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1339 | ||
1340 | if (key.type != key_type || key.objectid != dirid) { | |
1341 | ret = 1; | |
1342 | goto next; | |
1343 | } | |
1344 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1345 | struct btrfs_dir_log_item); | |
1346 | found_end = btrfs_dir_log_end(path->nodes[0], item); | |
1347 | ||
1348 | if (*start_ret >= key.offset && *start_ret <= found_end) { | |
1349 | ret = 0; | |
1350 | *start_ret = key.offset; | |
1351 | *end_ret = found_end; | |
1352 | goto out; | |
1353 | } | |
1354 | ret = 1; | |
1355 | next: | |
1356 | /* check the next slot in the tree to see if it is a valid item */ | |
1357 | nritems = btrfs_header_nritems(path->nodes[0]); | |
1358 | if (path->slots[0] >= nritems) { | |
1359 | ret = btrfs_next_leaf(root, path); | |
1360 | if (ret) | |
1361 | goto out; | |
1362 | } else { | |
1363 | path->slots[0]++; | |
1364 | } | |
1365 | ||
1366 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1367 | ||
1368 | if (key.type != key_type || key.objectid != dirid) { | |
1369 | ret = 1; | |
1370 | goto out; | |
1371 | } | |
1372 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
1373 | struct btrfs_dir_log_item); | |
1374 | found_end = btrfs_dir_log_end(path->nodes[0], item); | |
1375 | *start_ret = key.offset; | |
1376 | *end_ret = found_end; | |
1377 | ret = 0; | |
1378 | out: | |
b3b4aa74 | 1379 | btrfs_release_path(path); |
e02119d5 CM |
1380 | return ret; |
1381 | } | |
1382 | ||
1383 | /* | |
1384 | * this looks for a given directory item in the log. If the directory | |
1385 | * item is not in the log, the item is removed and the inode it points | |
1386 | * to is unlinked | |
1387 | */ | |
1388 | static noinline int check_item_in_log(struct btrfs_trans_handle *trans, | |
1389 | struct btrfs_root *root, | |
1390 | struct btrfs_root *log, | |
1391 | struct btrfs_path *path, | |
1392 | struct btrfs_path *log_path, | |
1393 | struct inode *dir, | |
1394 | struct btrfs_key *dir_key) | |
1395 | { | |
1396 | int ret; | |
1397 | struct extent_buffer *eb; | |
1398 | int slot; | |
1399 | u32 item_size; | |
1400 | struct btrfs_dir_item *di; | |
1401 | struct btrfs_dir_item *log_di; | |
1402 | int name_len; | |
1403 | unsigned long ptr; | |
1404 | unsigned long ptr_end; | |
1405 | char *name; | |
1406 | struct inode *inode; | |
1407 | struct btrfs_key location; | |
1408 | ||
1409 | again: | |
1410 | eb = path->nodes[0]; | |
1411 | slot = path->slots[0]; | |
1412 | item_size = btrfs_item_size_nr(eb, slot); | |
1413 | ptr = btrfs_item_ptr_offset(eb, slot); | |
1414 | ptr_end = ptr + item_size; | |
d397712b | 1415 | while (ptr < ptr_end) { |
e02119d5 | 1416 | di = (struct btrfs_dir_item *)ptr; |
22a94d44 JB |
1417 | if (verify_dir_item(root, eb, di)) { |
1418 | ret = -EIO; | |
1419 | goto out; | |
1420 | } | |
1421 | ||
e02119d5 CM |
1422 | name_len = btrfs_dir_name_len(eb, di); |
1423 | name = kmalloc(name_len, GFP_NOFS); | |
1424 | if (!name) { | |
1425 | ret = -ENOMEM; | |
1426 | goto out; | |
1427 | } | |
1428 | read_extent_buffer(eb, name, (unsigned long)(di + 1), | |
1429 | name_len); | |
1430 | log_di = NULL; | |
12fcfd22 | 1431 | if (log && dir_key->type == BTRFS_DIR_ITEM_KEY) { |
e02119d5 CM |
1432 | log_di = btrfs_lookup_dir_item(trans, log, log_path, |
1433 | dir_key->objectid, | |
1434 | name, name_len, 0); | |
12fcfd22 | 1435 | } else if (log && dir_key->type == BTRFS_DIR_INDEX_KEY) { |
e02119d5 CM |
1436 | log_di = btrfs_lookup_dir_index_item(trans, log, |
1437 | log_path, | |
1438 | dir_key->objectid, | |
1439 | dir_key->offset, | |
1440 | name, name_len, 0); | |
1441 | } | |
c704005d | 1442 | if (IS_ERR_OR_NULL(log_di)) { |
e02119d5 | 1443 | btrfs_dir_item_key_to_cpu(eb, di, &location); |
b3b4aa74 DS |
1444 | btrfs_release_path(path); |
1445 | btrfs_release_path(log_path); | |
e02119d5 | 1446 | inode = read_one_inode(root, location.objectid); |
c00e9493 TI |
1447 | if (!inode) { |
1448 | kfree(name); | |
1449 | return -EIO; | |
1450 | } | |
e02119d5 CM |
1451 | |
1452 | ret = link_to_fixup_dir(trans, root, | |
1453 | path, location.objectid); | |
1454 | BUG_ON(ret); | |
1455 | btrfs_inc_nlink(inode); | |
1456 | ret = btrfs_unlink_inode(trans, root, dir, inode, | |
1457 | name, name_len); | |
1458 | BUG_ON(ret); | |
1459 | kfree(name); | |
1460 | iput(inode); | |
1461 | ||
1462 | /* there might still be more names under this key | |
1463 | * check and repeat if required | |
1464 | */ | |
1465 | ret = btrfs_search_slot(NULL, root, dir_key, path, | |
1466 | 0, 0); | |
1467 | if (ret == 0) | |
1468 | goto again; | |
1469 | ret = 0; | |
1470 | goto out; | |
1471 | } | |
b3b4aa74 | 1472 | btrfs_release_path(log_path); |
e02119d5 CM |
1473 | kfree(name); |
1474 | ||
1475 | ptr = (unsigned long)(di + 1); | |
1476 | ptr += name_len; | |
1477 | } | |
1478 | ret = 0; | |
1479 | out: | |
b3b4aa74 DS |
1480 | btrfs_release_path(path); |
1481 | btrfs_release_path(log_path); | |
e02119d5 CM |
1482 | return ret; |
1483 | } | |
1484 | ||
1485 | /* | |
1486 | * deletion replay happens before we copy any new directory items | |
1487 | * out of the log or out of backreferences from inodes. It | |
1488 | * scans the log to find ranges of keys that log is authoritative for, | |
1489 | * and then scans the directory to find items in those ranges that are | |
1490 | * not present in the log. | |
1491 | * | |
1492 | * Anything we don't find in the log is unlinked and removed from the | |
1493 | * directory. | |
1494 | */ | |
1495 | static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, | |
1496 | struct btrfs_root *root, | |
1497 | struct btrfs_root *log, | |
1498 | struct btrfs_path *path, | |
12fcfd22 | 1499 | u64 dirid, int del_all) |
e02119d5 CM |
1500 | { |
1501 | u64 range_start; | |
1502 | u64 range_end; | |
1503 | int key_type = BTRFS_DIR_LOG_ITEM_KEY; | |
1504 | int ret = 0; | |
1505 | struct btrfs_key dir_key; | |
1506 | struct btrfs_key found_key; | |
1507 | struct btrfs_path *log_path; | |
1508 | struct inode *dir; | |
1509 | ||
1510 | dir_key.objectid = dirid; | |
1511 | dir_key.type = BTRFS_DIR_ITEM_KEY; | |
1512 | log_path = btrfs_alloc_path(); | |
1513 | if (!log_path) | |
1514 | return -ENOMEM; | |
1515 | ||
1516 | dir = read_one_inode(root, dirid); | |
1517 | /* it isn't an error if the inode isn't there, that can happen | |
1518 | * because we replay the deletes before we copy in the inode item | |
1519 | * from the log | |
1520 | */ | |
1521 | if (!dir) { | |
1522 | btrfs_free_path(log_path); | |
1523 | return 0; | |
1524 | } | |
1525 | again: | |
1526 | range_start = 0; | |
1527 | range_end = 0; | |
d397712b | 1528 | while (1) { |
12fcfd22 CM |
1529 | if (del_all) |
1530 | range_end = (u64)-1; | |
1531 | else { | |
1532 | ret = find_dir_range(log, path, dirid, key_type, | |
1533 | &range_start, &range_end); | |
1534 | if (ret != 0) | |
1535 | break; | |
1536 | } | |
e02119d5 CM |
1537 | |
1538 | dir_key.offset = range_start; | |
d397712b | 1539 | while (1) { |
e02119d5 CM |
1540 | int nritems; |
1541 | ret = btrfs_search_slot(NULL, root, &dir_key, path, | |
1542 | 0, 0); | |
1543 | if (ret < 0) | |
1544 | goto out; | |
1545 | ||
1546 | nritems = btrfs_header_nritems(path->nodes[0]); | |
1547 | if (path->slots[0] >= nritems) { | |
1548 | ret = btrfs_next_leaf(root, path); | |
1549 | if (ret) | |
1550 | break; | |
1551 | } | |
1552 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
1553 | path->slots[0]); | |
1554 | if (found_key.objectid != dirid || | |
1555 | found_key.type != dir_key.type) | |
1556 | goto next_type; | |
1557 | ||
1558 | if (found_key.offset > range_end) | |
1559 | break; | |
1560 | ||
1561 | ret = check_item_in_log(trans, root, log, path, | |
12fcfd22 CM |
1562 | log_path, dir, |
1563 | &found_key); | |
e02119d5 CM |
1564 | BUG_ON(ret); |
1565 | if (found_key.offset == (u64)-1) | |
1566 | break; | |
1567 | dir_key.offset = found_key.offset + 1; | |
1568 | } | |
b3b4aa74 | 1569 | btrfs_release_path(path); |
e02119d5 CM |
1570 | if (range_end == (u64)-1) |
1571 | break; | |
1572 | range_start = range_end + 1; | |
1573 | } | |
1574 | ||
1575 | next_type: | |
1576 | ret = 0; | |
1577 | if (key_type == BTRFS_DIR_LOG_ITEM_KEY) { | |
1578 | key_type = BTRFS_DIR_LOG_INDEX_KEY; | |
1579 | dir_key.type = BTRFS_DIR_INDEX_KEY; | |
b3b4aa74 | 1580 | btrfs_release_path(path); |
e02119d5 CM |
1581 | goto again; |
1582 | } | |
1583 | out: | |
b3b4aa74 | 1584 | btrfs_release_path(path); |
e02119d5 CM |
1585 | btrfs_free_path(log_path); |
1586 | iput(dir); | |
1587 | return ret; | |
1588 | } | |
1589 | ||
1590 | /* | |
1591 | * the process_func used to replay items from the log tree. This | |
1592 | * gets called in two different stages. The first stage just looks | |
1593 | * for inodes and makes sure they are all copied into the subvolume. | |
1594 | * | |
1595 | * The second stage copies all the other item types from the log into | |
1596 | * the subvolume. The two stage approach is slower, but gets rid of | |
1597 | * lots of complexity around inodes referencing other inodes that exist | |
1598 | * only in the log (references come from either directory items or inode | |
1599 | * back refs). | |
1600 | */ | |
1601 | static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb, | |
1602 | struct walk_control *wc, u64 gen) | |
1603 | { | |
1604 | int nritems; | |
1605 | struct btrfs_path *path; | |
1606 | struct btrfs_root *root = wc->replay_dest; | |
1607 | struct btrfs_key key; | |
e02119d5 CM |
1608 | int level; |
1609 | int i; | |
1610 | int ret; | |
1611 | ||
1612 | btrfs_read_buffer(eb, gen); | |
1613 | ||
1614 | level = btrfs_header_level(eb); | |
1615 | ||
1616 | if (level != 0) | |
1617 | return 0; | |
1618 | ||
1619 | path = btrfs_alloc_path(); | |
1620 | BUG_ON(!path); | |
1621 | ||
1622 | nritems = btrfs_header_nritems(eb); | |
1623 | for (i = 0; i < nritems; i++) { | |
1624 | btrfs_item_key_to_cpu(eb, &key, i); | |
e02119d5 CM |
1625 | |
1626 | /* inode keys are done during the first stage */ | |
1627 | if (key.type == BTRFS_INODE_ITEM_KEY && | |
1628 | wc->stage == LOG_WALK_REPLAY_INODES) { | |
e02119d5 CM |
1629 | struct btrfs_inode_item *inode_item; |
1630 | u32 mode; | |
1631 | ||
1632 | inode_item = btrfs_item_ptr(eb, i, | |
1633 | struct btrfs_inode_item); | |
1634 | mode = btrfs_inode_mode(eb, inode_item); | |
1635 | if (S_ISDIR(mode)) { | |
1636 | ret = replay_dir_deletes(wc->trans, | |
12fcfd22 | 1637 | root, log, path, key.objectid, 0); |
e02119d5 CM |
1638 | BUG_ON(ret); |
1639 | } | |
1640 | ret = overwrite_item(wc->trans, root, path, | |
1641 | eb, i, &key); | |
1642 | BUG_ON(ret); | |
1643 | ||
c71bf099 YZ |
1644 | /* for regular files, make sure corresponding |
1645 | * orhpan item exist. extents past the new EOF | |
1646 | * will be truncated later by orphan cleanup. | |
e02119d5 CM |
1647 | */ |
1648 | if (S_ISREG(mode)) { | |
c71bf099 YZ |
1649 | ret = insert_orphan_item(wc->trans, root, |
1650 | key.objectid); | |
e02119d5 | 1651 | BUG_ON(ret); |
e02119d5 | 1652 | } |
c71bf099 | 1653 | |
e02119d5 CM |
1654 | ret = link_to_fixup_dir(wc->trans, root, |
1655 | path, key.objectid); | |
1656 | BUG_ON(ret); | |
1657 | } | |
1658 | if (wc->stage < LOG_WALK_REPLAY_ALL) | |
1659 | continue; | |
1660 | ||
1661 | /* these keys are simply copied */ | |
1662 | if (key.type == BTRFS_XATTR_ITEM_KEY) { | |
1663 | ret = overwrite_item(wc->trans, root, path, | |
1664 | eb, i, &key); | |
1665 | BUG_ON(ret); | |
1666 | } else if (key.type == BTRFS_INODE_REF_KEY) { | |
1667 | ret = add_inode_ref(wc->trans, root, log, path, | |
1668 | eb, i, &key); | |
1669 | BUG_ON(ret && ret != -ENOENT); | |
1670 | } else if (key.type == BTRFS_EXTENT_DATA_KEY) { | |
1671 | ret = replay_one_extent(wc->trans, root, path, | |
1672 | eb, i, &key); | |
1673 | BUG_ON(ret); | |
e02119d5 CM |
1674 | } else if (key.type == BTRFS_DIR_ITEM_KEY || |
1675 | key.type == BTRFS_DIR_INDEX_KEY) { | |
1676 | ret = replay_one_dir_item(wc->trans, root, path, | |
1677 | eb, i, &key); | |
1678 | BUG_ON(ret); | |
1679 | } | |
1680 | } | |
1681 | btrfs_free_path(path); | |
1682 | return 0; | |
1683 | } | |
1684 | ||
d397712b | 1685 | static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans, |
e02119d5 CM |
1686 | struct btrfs_root *root, |
1687 | struct btrfs_path *path, int *level, | |
1688 | struct walk_control *wc) | |
1689 | { | |
1690 | u64 root_owner; | |
e02119d5 CM |
1691 | u64 bytenr; |
1692 | u64 ptr_gen; | |
1693 | struct extent_buffer *next; | |
1694 | struct extent_buffer *cur; | |
1695 | struct extent_buffer *parent; | |
1696 | u32 blocksize; | |
1697 | int ret = 0; | |
1698 | ||
1699 | WARN_ON(*level < 0); | |
1700 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
1701 | ||
d397712b | 1702 | while (*level > 0) { |
e02119d5 CM |
1703 | WARN_ON(*level < 0); |
1704 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
1705 | cur = path->nodes[*level]; | |
1706 | ||
1707 | if (btrfs_header_level(cur) != *level) | |
1708 | WARN_ON(1); | |
1709 | ||
1710 | if (path->slots[*level] >= | |
1711 | btrfs_header_nritems(cur)) | |
1712 | break; | |
1713 | ||
1714 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); | |
1715 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); | |
1716 | blocksize = btrfs_level_size(root, *level - 1); | |
1717 | ||
1718 | parent = path->nodes[*level]; | |
1719 | root_owner = btrfs_header_owner(parent); | |
e02119d5 CM |
1720 | |
1721 | next = btrfs_find_create_tree_block(root, bytenr, blocksize); | |
2a29edc6 | 1722 | if (!next) |
1723 | return -ENOMEM; | |
e02119d5 | 1724 | |
e02119d5 | 1725 | if (*level == 1) { |
4a500fd1 YZ |
1726 | wc->process_func(root, next, wc, ptr_gen); |
1727 | ||
e02119d5 CM |
1728 | path->slots[*level]++; |
1729 | if (wc->free) { | |
1730 | btrfs_read_buffer(next, ptr_gen); | |
1731 | ||
1732 | btrfs_tree_lock(next); | |
1733 | clean_tree_block(trans, root, next); | |
b4ce94de | 1734 | btrfs_set_lock_blocking(next); |
e02119d5 CM |
1735 | btrfs_wait_tree_block_writeback(next); |
1736 | btrfs_tree_unlock(next); | |
1737 | ||
e02119d5 CM |
1738 | WARN_ON(root_owner != |
1739 | BTRFS_TREE_LOG_OBJECTID); | |
d00aff00 CM |
1740 | ret = btrfs_free_reserved_extent(root, |
1741 | bytenr, blocksize); | |
e02119d5 CM |
1742 | BUG_ON(ret); |
1743 | } | |
1744 | free_extent_buffer(next); | |
1745 | continue; | |
1746 | } | |
1747 | btrfs_read_buffer(next, ptr_gen); | |
1748 | ||
1749 | WARN_ON(*level <= 0); | |
1750 | if (path->nodes[*level-1]) | |
1751 | free_extent_buffer(path->nodes[*level-1]); | |
1752 | path->nodes[*level-1] = next; | |
1753 | *level = btrfs_header_level(next); | |
1754 | path->slots[*level] = 0; | |
1755 | cond_resched(); | |
1756 | } | |
1757 | WARN_ON(*level < 0); | |
1758 | WARN_ON(*level >= BTRFS_MAX_LEVEL); | |
1759 | ||
4a500fd1 | 1760 | path->slots[*level] = btrfs_header_nritems(path->nodes[*level]); |
e02119d5 CM |
1761 | |
1762 | cond_resched(); | |
1763 | return 0; | |
1764 | } | |
1765 | ||
d397712b | 1766 | static noinline int walk_up_log_tree(struct btrfs_trans_handle *trans, |
e02119d5 CM |
1767 | struct btrfs_root *root, |
1768 | struct btrfs_path *path, int *level, | |
1769 | struct walk_control *wc) | |
1770 | { | |
1771 | u64 root_owner; | |
e02119d5 CM |
1772 | int i; |
1773 | int slot; | |
1774 | int ret; | |
1775 | ||
d397712b | 1776 | for (i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { |
e02119d5 | 1777 | slot = path->slots[i]; |
4a500fd1 | 1778 | if (slot + 1 < btrfs_header_nritems(path->nodes[i])) { |
e02119d5 CM |
1779 | path->slots[i]++; |
1780 | *level = i; | |
1781 | WARN_ON(*level == 0); | |
1782 | return 0; | |
1783 | } else { | |
31840ae1 ZY |
1784 | struct extent_buffer *parent; |
1785 | if (path->nodes[*level] == root->node) | |
1786 | parent = path->nodes[*level]; | |
1787 | else | |
1788 | parent = path->nodes[*level + 1]; | |
1789 | ||
1790 | root_owner = btrfs_header_owner(parent); | |
e02119d5 CM |
1791 | wc->process_func(root, path->nodes[*level], wc, |
1792 | btrfs_header_generation(path->nodes[*level])); | |
1793 | if (wc->free) { | |
1794 | struct extent_buffer *next; | |
1795 | ||
1796 | next = path->nodes[*level]; | |
1797 | ||
1798 | btrfs_tree_lock(next); | |
1799 | clean_tree_block(trans, root, next); | |
b4ce94de | 1800 | btrfs_set_lock_blocking(next); |
e02119d5 CM |
1801 | btrfs_wait_tree_block_writeback(next); |
1802 | btrfs_tree_unlock(next); | |
1803 | ||
e02119d5 | 1804 | WARN_ON(root_owner != BTRFS_TREE_LOG_OBJECTID); |
d00aff00 | 1805 | ret = btrfs_free_reserved_extent(root, |
e02119d5 | 1806 | path->nodes[*level]->start, |
d00aff00 | 1807 | path->nodes[*level]->len); |
e02119d5 CM |
1808 | BUG_ON(ret); |
1809 | } | |
1810 | free_extent_buffer(path->nodes[*level]); | |
1811 | path->nodes[*level] = NULL; | |
1812 | *level = i + 1; | |
1813 | } | |
1814 | } | |
1815 | return 1; | |
1816 | } | |
1817 | ||
1818 | /* | |
1819 | * drop the reference count on the tree rooted at 'snap'. This traverses | |
1820 | * the tree freeing any blocks that have a ref count of zero after being | |
1821 | * decremented. | |
1822 | */ | |
1823 | static int walk_log_tree(struct btrfs_trans_handle *trans, | |
1824 | struct btrfs_root *log, struct walk_control *wc) | |
1825 | { | |
1826 | int ret = 0; | |
1827 | int wret; | |
1828 | int level; | |
1829 | struct btrfs_path *path; | |
1830 | int i; | |
1831 | int orig_level; | |
1832 | ||
1833 | path = btrfs_alloc_path(); | |
db5b493a TI |
1834 | if (!path) |
1835 | return -ENOMEM; | |
e02119d5 CM |
1836 | |
1837 | level = btrfs_header_level(log->node); | |
1838 | orig_level = level; | |
1839 | path->nodes[level] = log->node; | |
1840 | extent_buffer_get(log->node); | |
1841 | path->slots[level] = 0; | |
1842 | ||
d397712b | 1843 | while (1) { |
e02119d5 CM |
1844 | wret = walk_down_log_tree(trans, log, path, &level, wc); |
1845 | if (wret > 0) | |
1846 | break; | |
1847 | if (wret < 0) | |
1848 | ret = wret; | |
1849 | ||
1850 | wret = walk_up_log_tree(trans, log, path, &level, wc); | |
1851 | if (wret > 0) | |
1852 | break; | |
1853 | if (wret < 0) | |
1854 | ret = wret; | |
1855 | } | |
1856 | ||
1857 | /* was the root node processed? if not, catch it here */ | |
1858 | if (path->nodes[orig_level]) { | |
1859 | wc->process_func(log, path->nodes[orig_level], wc, | |
1860 | btrfs_header_generation(path->nodes[orig_level])); | |
1861 | if (wc->free) { | |
1862 | struct extent_buffer *next; | |
1863 | ||
1864 | next = path->nodes[orig_level]; | |
1865 | ||
1866 | btrfs_tree_lock(next); | |
1867 | clean_tree_block(trans, log, next); | |
b4ce94de | 1868 | btrfs_set_lock_blocking(next); |
e02119d5 CM |
1869 | btrfs_wait_tree_block_writeback(next); |
1870 | btrfs_tree_unlock(next); | |
1871 | ||
e02119d5 CM |
1872 | WARN_ON(log->root_key.objectid != |
1873 | BTRFS_TREE_LOG_OBJECTID); | |
d00aff00 CM |
1874 | ret = btrfs_free_reserved_extent(log, next->start, |
1875 | next->len); | |
e02119d5 CM |
1876 | BUG_ON(ret); |
1877 | } | |
1878 | } | |
1879 | ||
1880 | for (i = 0; i <= orig_level; i++) { | |
1881 | if (path->nodes[i]) { | |
1882 | free_extent_buffer(path->nodes[i]); | |
1883 | path->nodes[i] = NULL; | |
1884 | } | |
1885 | } | |
1886 | btrfs_free_path(path); | |
e02119d5 CM |
1887 | return ret; |
1888 | } | |
1889 | ||
7237f183 YZ |
1890 | /* |
1891 | * helper function to update the item for a given subvolumes log root | |
1892 | * in the tree of log roots | |
1893 | */ | |
1894 | static int update_log_root(struct btrfs_trans_handle *trans, | |
1895 | struct btrfs_root *log) | |
1896 | { | |
1897 | int ret; | |
1898 | ||
1899 | if (log->log_transid == 1) { | |
1900 | /* insert root item on the first sync */ | |
1901 | ret = btrfs_insert_root(trans, log->fs_info->log_root_tree, | |
1902 | &log->root_key, &log->root_item); | |
1903 | } else { | |
1904 | ret = btrfs_update_root(trans, log->fs_info->log_root_tree, | |
1905 | &log->root_key, &log->root_item); | |
1906 | } | |
1907 | return ret; | |
1908 | } | |
1909 | ||
12fcfd22 CM |
1910 | static int wait_log_commit(struct btrfs_trans_handle *trans, |
1911 | struct btrfs_root *root, unsigned long transid) | |
e02119d5 CM |
1912 | { |
1913 | DEFINE_WAIT(wait); | |
7237f183 | 1914 | int index = transid % 2; |
e02119d5 | 1915 | |
7237f183 YZ |
1916 | /* |
1917 | * we only allow two pending log transactions at a time, | |
1918 | * so we know that if ours is more than 2 older than the | |
1919 | * current transaction, we're done | |
1920 | */ | |
e02119d5 | 1921 | do { |
7237f183 YZ |
1922 | prepare_to_wait(&root->log_commit_wait[index], |
1923 | &wait, TASK_UNINTERRUPTIBLE); | |
1924 | mutex_unlock(&root->log_mutex); | |
12fcfd22 CM |
1925 | |
1926 | if (root->fs_info->last_trans_log_full_commit != | |
1927 | trans->transid && root->log_transid < transid + 2 && | |
7237f183 YZ |
1928 | atomic_read(&root->log_commit[index])) |
1929 | schedule(); | |
12fcfd22 | 1930 | |
7237f183 YZ |
1931 | finish_wait(&root->log_commit_wait[index], &wait); |
1932 | mutex_lock(&root->log_mutex); | |
1933 | } while (root->log_transid < transid + 2 && | |
1934 | atomic_read(&root->log_commit[index])); | |
1935 | return 0; | |
1936 | } | |
1937 | ||
12fcfd22 CM |
1938 | static int wait_for_writer(struct btrfs_trans_handle *trans, |
1939 | struct btrfs_root *root) | |
7237f183 YZ |
1940 | { |
1941 | DEFINE_WAIT(wait); | |
1942 | while (atomic_read(&root->log_writers)) { | |
1943 | prepare_to_wait(&root->log_writer_wait, | |
1944 | &wait, TASK_UNINTERRUPTIBLE); | |
1945 | mutex_unlock(&root->log_mutex); | |
12fcfd22 CM |
1946 | if (root->fs_info->last_trans_log_full_commit != |
1947 | trans->transid && atomic_read(&root->log_writers)) | |
e02119d5 | 1948 | schedule(); |
7237f183 YZ |
1949 | mutex_lock(&root->log_mutex); |
1950 | finish_wait(&root->log_writer_wait, &wait); | |
1951 | } | |
e02119d5 CM |
1952 | return 0; |
1953 | } | |
1954 | ||
1955 | /* | |
1956 | * btrfs_sync_log does sends a given tree log down to the disk and | |
1957 | * updates the super blocks to record it. When this call is done, | |
12fcfd22 CM |
1958 | * you know that any inodes previously logged are safely on disk only |
1959 | * if it returns 0. | |
1960 | * | |
1961 | * Any other return value means you need to call btrfs_commit_transaction. | |
1962 | * Some of the edge cases for fsyncing directories that have had unlinks | |
1963 | * or renames done in the past mean that sometimes the only safe | |
1964 | * fsync is to commit the whole FS. When btrfs_sync_log returns -EAGAIN, | |
1965 | * that has happened. | |
e02119d5 CM |
1966 | */ |
1967 | int btrfs_sync_log(struct btrfs_trans_handle *trans, | |
1968 | struct btrfs_root *root) | |
1969 | { | |
7237f183 YZ |
1970 | int index1; |
1971 | int index2; | |
8cef4e16 | 1972 | int mark; |
e02119d5 | 1973 | int ret; |
e02119d5 | 1974 | struct btrfs_root *log = root->log_root; |
7237f183 | 1975 | struct btrfs_root *log_root_tree = root->fs_info->log_root_tree; |
8cef4e16 | 1976 | unsigned long log_transid = 0; |
e02119d5 | 1977 | |
7237f183 YZ |
1978 | mutex_lock(&root->log_mutex); |
1979 | index1 = root->log_transid % 2; | |
1980 | if (atomic_read(&root->log_commit[index1])) { | |
12fcfd22 | 1981 | wait_log_commit(trans, root, root->log_transid); |
7237f183 YZ |
1982 | mutex_unlock(&root->log_mutex); |
1983 | return 0; | |
e02119d5 | 1984 | } |
7237f183 YZ |
1985 | atomic_set(&root->log_commit[index1], 1); |
1986 | ||
1987 | /* wait for previous tree log sync to complete */ | |
1988 | if (atomic_read(&root->log_commit[(index1 + 1) % 2])) | |
12fcfd22 | 1989 | wait_log_commit(trans, root, root->log_transid - 1); |
e02119d5 | 1990 | |
86df7eb9 | 1991 | while (1) { |
7237f183 | 1992 | unsigned long batch = root->log_batch; |
86df7eb9 YZ |
1993 | if (root->log_multiple_pids) { |
1994 | mutex_unlock(&root->log_mutex); | |
1995 | schedule_timeout_uninterruptible(1); | |
1996 | mutex_lock(&root->log_mutex); | |
1997 | } | |
12fcfd22 | 1998 | wait_for_writer(trans, root); |
7237f183 | 1999 | if (batch == root->log_batch) |
e02119d5 CM |
2000 | break; |
2001 | } | |
e02119d5 | 2002 | |
12fcfd22 CM |
2003 | /* bail out if we need to do a full commit */ |
2004 | if (root->fs_info->last_trans_log_full_commit == trans->transid) { | |
2005 | ret = -EAGAIN; | |
2006 | mutex_unlock(&root->log_mutex); | |
2007 | goto out; | |
2008 | } | |
2009 | ||
8cef4e16 YZ |
2010 | log_transid = root->log_transid; |
2011 | if (log_transid % 2 == 0) | |
2012 | mark = EXTENT_DIRTY; | |
2013 | else | |
2014 | mark = EXTENT_NEW; | |
2015 | ||
690587d1 CM |
2016 | /* we start IO on all the marked extents here, but we don't actually |
2017 | * wait for them until later. | |
2018 | */ | |
8cef4e16 | 2019 | ret = btrfs_write_marked_extents(log, &log->dirty_log_pages, mark); |
e02119d5 | 2020 | BUG_ON(ret); |
7237f183 | 2021 | |
5d4f98a2 | 2022 | btrfs_set_root_node(&log->root_item, log->node); |
7237f183 YZ |
2023 | |
2024 | root->log_batch = 0; | |
2025 | root->log_transid++; | |
2026 | log->log_transid = root->log_transid; | |
ff782e0a | 2027 | root->log_start_pid = 0; |
7237f183 YZ |
2028 | smp_mb(); |
2029 | /* | |
8cef4e16 YZ |
2030 | * IO has been started, blocks of the log tree have WRITTEN flag set |
2031 | * in their headers. new modifications of the log will be written to | |
2032 | * new positions. so it's safe to allow log writers to go in. | |
7237f183 YZ |
2033 | */ |
2034 | mutex_unlock(&root->log_mutex); | |
2035 | ||
2036 | mutex_lock(&log_root_tree->log_mutex); | |
2037 | log_root_tree->log_batch++; | |
2038 | atomic_inc(&log_root_tree->log_writers); | |
2039 | mutex_unlock(&log_root_tree->log_mutex); | |
2040 | ||
2041 | ret = update_log_root(trans, log); | |
7237f183 YZ |
2042 | |
2043 | mutex_lock(&log_root_tree->log_mutex); | |
2044 | if (atomic_dec_and_test(&log_root_tree->log_writers)) { | |
2045 | smp_mb(); | |
2046 | if (waitqueue_active(&log_root_tree->log_writer_wait)) | |
2047 | wake_up(&log_root_tree->log_writer_wait); | |
2048 | } | |
2049 | ||
4a500fd1 YZ |
2050 | if (ret) { |
2051 | BUG_ON(ret != -ENOSPC); | |
2052 | root->fs_info->last_trans_log_full_commit = trans->transid; | |
2053 | btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); | |
2054 | mutex_unlock(&log_root_tree->log_mutex); | |
2055 | ret = -EAGAIN; | |
2056 | goto out; | |
2057 | } | |
2058 | ||
7237f183 YZ |
2059 | index2 = log_root_tree->log_transid % 2; |
2060 | if (atomic_read(&log_root_tree->log_commit[index2])) { | |
8cef4e16 | 2061 | btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); |
12fcfd22 CM |
2062 | wait_log_commit(trans, log_root_tree, |
2063 | log_root_tree->log_transid); | |
7237f183 | 2064 | mutex_unlock(&log_root_tree->log_mutex); |
b31eabd8 | 2065 | ret = 0; |
7237f183 YZ |
2066 | goto out; |
2067 | } | |
2068 | atomic_set(&log_root_tree->log_commit[index2], 1); | |
2069 | ||
12fcfd22 CM |
2070 | if (atomic_read(&log_root_tree->log_commit[(index2 + 1) % 2])) { |
2071 | wait_log_commit(trans, log_root_tree, | |
2072 | log_root_tree->log_transid - 1); | |
2073 | } | |
2074 | ||
2075 | wait_for_writer(trans, log_root_tree); | |
7237f183 | 2076 | |
12fcfd22 CM |
2077 | /* |
2078 | * now that we've moved on to the tree of log tree roots, | |
2079 | * check the full commit flag again | |
2080 | */ | |
2081 | if (root->fs_info->last_trans_log_full_commit == trans->transid) { | |
8cef4e16 | 2082 | btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); |
12fcfd22 CM |
2083 | mutex_unlock(&log_root_tree->log_mutex); |
2084 | ret = -EAGAIN; | |
2085 | goto out_wake_log_root; | |
2086 | } | |
7237f183 YZ |
2087 | |
2088 | ret = btrfs_write_and_wait_marked_extents(log_root_tree, | |
8cef4e16 YZ |
2089 | &log_root_tree->dirty_log_pages, |
2090 | EXTENT_DIRTY | EXTENT_NEW); | |
e02119d5 | 2091 | BUG_ON(ret); |
8cef4e16 | 2092 | btrfs_wait_marked_extents(log, &log->dirty_log_pages, mark); |
e02119d5 CM |
2093 | |
2094 | btrfs_set_super_log_root(&root->fs_info->super_for_commit, | |
7237f183 | 2095 | log_root_tree->node->start); |
e02119d5 | 2096 | btrfs_set_super_log_root_level(&root->fs_info->super_for_commit, |
7237f183 | 2097 | btrfs_header_level(log_root_tree->node)); |
e02119d5 | 2098 | |
7237f183 YZ |
2099 | log_root_tree->log_batch = 0; |
2100 | log_root_tree->log_transid++; | |
e02119d5 | 2101 | smp_mb(); |
7237f183 YZ |
2102 | |
2103 | mutex_unlock(&log_root_tree->log_mutex); | |
2104 | ||
2105 | /* | |
2106 | * nobody else is going to jump in and write the the ctree | |
2107 | * super here because the log_commit atomic below is protecting | |
2108 | * us. We must be called with a transaction handle pinning | |
2109 | * the running transaction open, so a full commit can't hop | |
2110 | * in and cause problems either. | |
2111 | */ | |
a2de733c | 2112 | btrfs_scrub_pause_super(root); |
4722607d | 2113 | write_ctree_super(trans, root->fs_info->tree_root, 1); |
a2de733c | 2114 | btrfs_scrub_continue_super(root); |
12fcfd22 | 2115 | ret = 0; |
7237f183 | 2116 | |
257c62e1 CM |
2117 | mutex_lock(&root->log_mutex); |
2118 | if (root->last_log_commit < log_transid) | |
2119 | root->last_log_commit = log_transid; | |
2120 | mutex_unlock(&root->log_mutex); | |
2121 | ||
12fcfd22 | 2122 | out_wake_log_root: |
7237f183 YZ |
2123 | atomic_set(&log_root_tree->log_commit[index2], 0); |
2124 | smp_mb(); | |
2125 | if (waitqueue_active(&log_root_tree->log_commit_wait[index2])) | |
2126 | wake_up(&log_root_tree->log_commit_wait[index2]); | |
e02119d5 | 2127 | out: |
7237f183 YZ |
2128 | atomic_set(&root->log_commit[index1], 0); |
2129 | smp_mb(); | |
2130 | if (waitqueue_active(&root->log_commit_wait[index1])) | |
2131 | wake_up(&root->log_commit_wait[index1]); | |
b31eabd8 | 2132 | return ret; |
e02119d5 CM |
2133 | } |
2134 | ||
4a500fd1 YZ |
2135 | static void free_log_tree(struct btrfs_trans_handle *trans, |
2136 | struct btrfs_root *log) | |
e02119d5 CM |
2137 | { |
2138 | int ret; | |
d0c803c4 CM |
2139 | u64 start; |
2140 | u64 end; | |
e02119d5 CM |
2141 | struct walk_control wc = { |
2142 | .free = 1, | |
2143 | .process_func = process_one_buffer | |
2144 | }; | |
2145 | ||
e02119d5 CM |
2146 | ret = walk_log_tree(trans, log, &wc); |
2147 | BUG_ON(ret); | |
2148 | ||
d397712b | 2149 | while (1) { |
d0c803c4 | 2150 | ret = find_first_extent_bit(&log->dirty_log_pages, |
8cef4e16 | 2151 | 0, &start, &end, EXTENT_DIRTY | EXTENT_NEW); |
d0c803c4 CM |
2152 | if (ret) |
2153 | break; | |
2154 | ||
8cef4e16 YZ |
2155 | clear_extent_bits(&log->dirty_log_pages, start, end, |
2156 | EXTENT_DIRTY | EXTENT_NEW, GFP_NOFS); | |
d0c803c4 CM |
2157 | } |
2158 | ||
7237f183 YZ |
2159 | free_extent_buffer(log->node); |
2160 | kfree(log); | |
4a500fd1 YZ |
2161 | } |
2162 | ||
2163 | /* | |
2164 | * free all the extents used by the tree log. This should be called | |
2165 | * at commit time of the full transaction | |
2166 | */ | |
2167 | int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root) | |
2168 | { | |
2169 | if (root->log_root) { | |
2170 | free_log_tree(trans, root->log_root); | |
2171 | root->log_root = NULL; | |
2172 | } | |
2173 | return 0; | |
2174 | } | |
2175 | ||
2176 | int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, | |
2177 | struct btrfs_fs_info *fs_info) | |
2178 | { | |
2179 | if (fs_info->log_root_tree) { | |
2180 | free_log_tree(trans, fs_info->log_root_tree); | |
2181 | fs_info->log_root_tree = NULL; | |
2182 | } | |
e02119d5 CM |
2183 | return 0; |
2184 | } | |
2185 | ||
e02119d5 CM |
2186 | /* |
2187 | * If both a file and directory are logged, and unlinks or renames are | |
2188 | * mixed in, we have a few interesting corners: | |
2189 | * | |
2190 | * create file X in dir Y | |
2191 | * link file X to X.link in dir Y | |
2192 | * fsync file X | |
2193 | * unlink file X but leave X.link | |
2194 | * fsync dir Y | |
2195 | * | |
2196 | * After a crash we would expect only X.link to exist. But file X | |
2197 | * didn't get fsync'd again so the log has back refs for X and X.link. | |
2198 | * | |
2199 | * We solve this by removing directory entries and inode backrefs from the | |
2200 | * log when a file that was logged in the current transaction is | |
2201 | * unlinked. Any later fsync will include the updated log entries, and | |
2202 | * we'll be able to reconstruct the proper directory items from backrefs. | |
2203 | * | |
2204 | * This optimizations allows us to avoid relogging the entire inode | |
2205 | * or the entire directory. | |
2206 | */ | |
2207 | int btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans, | |
2208 | struct btrfs_root *root, | |
2209 | const char *name, int name_len, | |
2210 | struct inode *dir, u64 index) | |
2211 | { | |
2212 | struct btrfs_root *log; | |
2213 | struct btrfs_dir_item *di; | |
2214 | struct btrfs_path *path; | |
2215 | int ret; | |
4a500fd1 | 2216 | int err = 0; |
e02119d5 | 2217 | int bytes_del = 0; |
33345d01 | 2218 | u64 dir_ino = btrfs_ino(dir); |
e02119d5 | 2219 | |
3a5f1d45 CM |
2220 | if (BTRFS_I(dir)->logged_trans < trans->transid) |
2221 | return 0; | |
2222 | ||
e02119d5 CM |
2223 | ret = join_running_log_trans(root); |
2224 | if (ret) | |
2225 | return 0; | |
2226 | ||
2227 | mutex_lock(&BTRFS_I(dir)->log_mutex); | |
2228 | ||
2229 | log = root->log_root; | |
2230 | path = btrfs_alloc_path(); | |
a62f44a5 TI |
2231 | if (!path) { |
2232 | err = -ENOMEM; | |
2233 | goto out_unlock; | |
2234 | } | |
2a29edc6 | 2235 | |
33345d01 | 2236 | di = btrfs_lookup_dir_item(trans, log, path, dir_ino, |
e02119d5 | 2237 | name, name_len, -1); |
4a500fd1 YZ |
2238 | if (IS_ERR(di)) { |
2239 | err = PTR_ERR(di); | |
2240 | goto fail; | |
2241 | } | |
2242 | if (di) { | |
e02119d5 CM |
2243 | ret = btrfs_delete_one_dir_name(trans, log, path, di); |
2244 | bytes_del += name_len; | |
2245 | BUG_ON(ret); | |
2246 | } | |
b3b4aa74 | 2247 | btrfs_release_path(path); |
33345d01 | 2248 | di = btrfs_lookup_dir_index_item(trans, log, path, dir_ino, |
e02119d5 | 2249 | index, name, name_len, -1); |
4a500fd1 YZ |
2250 | if (IS_ERR(di)) { |
2251 | err = PTR_ERR(di); | |
2252 | goto fail; | |
2253 | } | |
2254 | if (di) { | |
e02119d5 CM |
2255 | ret = btrfs_delete_one_dir_name(trans, log, path, di); |
2256 | bytes_del += name_len; | |
2257 | BUG_ON(ret); | |
2258 | } | |
2259 | ||
2260 | /* update the directory size in the log to reflect the names | |
2261 | * we have removed | |
2262 | */ | |
2263 | if (bytes_del) { | |
2264 | struct btrfs_key key; | |
2265 | ||
33345d01 | 2266 | key.objectid = dir_ino; |
e02119d5 CM |
2267 | key.offset = 0; |
2268 | key.type = BTRFS_INODE_ITEM_KEY; | |
b3b4aa74 | 2269 | btrfs_release_path(path); |
e02119d5 CM |
2270 | |
2271 | ret = btrfs_search_slot(trans, log, &key, path, 0, 1); | |
4a500fd1 YZ |
2272 | if (ret < 0) { |
2273 | err = ret; | |
2274 | goto fail; | |
2275 | } | |
e02119d5 CM |
2276 | if (ret == 0) { |
2277 | struct btrfs_inode_item *item; | |
2278 | u64 i_size; | |
2279 | ||
2280 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
2281 | struct btrfs_inode_item); | |
2282 | i_size = btrfs_inode_size(path->nodes[0], item); | |
2283 | if (i_size > bytes_del) | |
2284 | i_size -= bytes_del; | |
2285 | else | |
2286 | i_size = 0; | |
2287 | btrfs_set_inode_size(path->nodes[0], item, i_size); | |
2288 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
2289 | } else | |
2290 | ret = 0; | |
b3b4aa74 | 2291 | btrfs_release_path(path); |
e02119d5 | 2292 | } |
4a500fd1 | 2293 | fail: |
e02119d5 | 2294 | btrfs_free_path(path); |
a62f44a5 | 2295 | out_unlock: |
e02119d5 | 2296 | mutex_unlock(&BTRFS_I(dir)->log_mutex); |
4a500fd1 YZ |
2297 | if (ret == -ENOSPC) { |
2298 | root->fs_info->last_trans_log_full_commit = trans->transid; | |
2299 | ret = 0; | |
2300 | } | |
12fcfd22 | 2301 | btrfs_end_log_trans(root); |
e02119d5 | 2302 | |
411fc6bc | 2303 | return err; |
e02119d5 CM |
2304 | } |
2305 | ||
2306 | /* see comments for btrfs_del_dir_entries_in_log */ | |
2307 | int btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans, | |
2308 | struct btrfs_root *root, | |
2309 | const char *name, int name_len, | |
2310 | struct inode *inode, u64 dirid) | |
2311 | { | |
2312 | struct btrfs_root *log; | |
2313 | u64 index; | |
2314 | int ret; | |
2315 | ||
3a5f1d45 CM |
2316 | if (BTRFS_I(inode)->logged_trans < trans->transid) |
2317 | return 0; | |
2318 | ||
e02119d5 CM |
2319 | ret = join_running_log_trans(root); |
2320 | if (ret) | |
2321 | return 0; | |
2322 | log = root->log_root; | |
2323 | mutex_lock(&BTRFS_I(inode)->log_mutex); | |
2324 | ||
33345d01 | 2325 | ret = btrfs_del_inode_ref(trans, log, name, name_len, btrfs_ino(inode), |
e02119d5 CM |
2326 | dirid, &index); |
2327 | mutex_unlock(&BTRFS_I(inode)->log_mutex); | |
4a500fd1 YZ |
2328 | if (ret == -ENOSPC) { |
2329 | root->fs_info->last_trans_log_full_commit = trans->transid; | |
2330 | ret = 0; | |
2331 | } | |
12fcfd22 | 2332 | btrfs_end_log_trans(root); |
e02119d5 | 2333 | |
e02119d5 CM |
2334 | return ret; |
2335 | } | |
2336 | ||
2337 | /* | |
2338 | * creates a range item in the log for 'dirid'. first_offset and | |
2339 | * last_offset tell us which parts of the key space the log should | |
2340 | * be considered authoritative for. | |
2341 | */ | |
2342 | static noinline int insert_dir_log_key(struct btrfs_trans_handle *trans, | |
2343 | struct btrfs_root *log, | |
2344 | struct btrfs_path *path, | |
2345 | int key_type, u64 dirid, | |
2346 | u64 first_offset, u64 last_offset) | |
2347 | { | |
2348 | int ret; | |
2349 | struct btrfs_key key; | |
2350 | struct btrfs_dir_log_item *item; | |
2351 | ||
2352 | key.objectid = dirid; | |
2353 | key.offset = first_offset; | |
2354 | if (key_type == BTRFS_DIR_ITEM_KEY) | |
2355 | key.type = BTRFS_DIR_LOG_ITEM_KEY; | |
2356 | else | |
2357 | key.type = BTRFS_DIR_LOG_INDEX_KEY; | |
2358 | ret = btrfs_insert_empty_item(trans, log, path, &key, sizeof(*item)); | |
4a500fd1 YZ |
2359 | if (ret) |
2360 | return ret; | |
e02119d5 CM |
2361 | |
2362 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
2363 | struct btrfs_dir_log_item); | |
2364 | btrfs_set_dir_log_end(path->nodes[0], item, last_offset); | |
2365 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
b3b4aa74 | 2366 | btrfs_release_path(path); |
e02119d5 CM |
2367 | return 0; |
2368 | } | |
2369 | ||
2370 | /* | |
2371 | * log all the items included in the current transaction for a given | |
2372 | * directory. This also creates the range items in the log tree required | |
2373 | * to replay anything deleted before the fsync | |
2374 | */ | |
2375 | static noinline int log_dir_items(struct btrfs_trans_handle *trans, | |
2376 | struct btrfs_root *root, struct inode *inode, | |
2377 | struct btrfs_path *path, | |
2378 | struct btrfs_path *dst_path, int key_type, | |
2379 | u64 min_offset, u64 *last_offset_ret) | |
2380 | { | |
2381 | struct btrfs_key min_key; | |
2382 | struct btrfs_key max_key; | |
2383 | struct btrfs_root *log = root->log_root; | |
2384 | struct extent_buffer *src; | |
4a500fd1 | 2385 | int err = 0; |
e02119d5 CM |
2386 | int ret; |
2387 | int i; | |
2388 | int nritems; | |
2389 | u64 first_offset = min_offset; | |
2390 | u64 last_offset = (u64)-1; | |
33345d01 | 2391 | u64 ino = btrfs_ino(inode); |
e02119d5 CM |
2392 | |
2393 | log = root->log_root; | |
33345d01 | 2394 | max_key.objectid = ino; |
e02119d5 CM |
2395 | max_key.offset = (u64)-1; |
2396 | max_key.type = key_type; | |
2397 | ||
33345d01 | 2398 | min_key.objectid = ino; |
e02119d5 CM |
2399 | min_key.type = key_type; |
2400 | min_key.offset = min_offset; | |
2401 | ||
2402 | path->keep_locks = 1; | |
2403 | ||
2404 | ret = btrfs_search_forward(root, &min_key, &max_key, | |
2405 | path, 0, trans->transid); | |
2406 | ||
2407 | /* | |
2408 | * we didn't find anything from this transaction, see if there | |
2409 | * is anything at all | |
2410 | */ | |
33345d01 LZ |
2411 | if (ret != 0 || min_key.objectid != ino || min_key.type != key_type) { |
2412 | min_key.objectid = ino; | |
e02119d5 CM |
2413 | min_key.type = key_type; |
2414 | min_key.offset = (u64)-1; | |
b3b4aa74 | 2415 | btrfs_release_path(path); |
e02119d5 CM |
2416 | ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0); |
2417 | if (ret < 0) { | |
b3b4aa74 | 2418 | btrfs_release_path(path); |
e02119d5 CM |
2419 | return ret; |
2420 | } | |
33345d01 | 2421 | ret = btrfs_previous_item(root, path, ino, key_type); |
e02119d5 CM |
2422 | |
2423 | /* if ret == 0 there are items for this type, | |
2424 | * create a range to tell us the last key of this type. | |
2425 | * otherwise, there are no items in this directory after | |
2426 | * *min_offset, and we create a range to indicate that. | |
2427 | */ | |
2428 | if (ret == 0) { | |
2429 | struct btrfs_key tmp; | |
2430 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, | |
2431 | path->slots[0]); | |
d397712b | 2432 | if (key_type == tmp.type) |
e02119d5 | 2433 | first_offset = max(min_offset, tmp.offset) + 1; |
e02119d5 CM |
2434 | } |
2435 | goto done; | |
2436 | } | |
2437 | ||
2438 | /* go backward to find any previous key */ | |
33345d01 | 2439 | ret = btrfs_previous_item(root, path, ino, key_type); |
e02119d5 CM |
2440 | if (ret == 0) { |
2441 | struct btrfs_key tmp; | |
2442 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); | |
2443 | if (key_type == tmp.type) { | |
2444 | first_offset = tmp.offset; | |
2445 | ret = overwrite_item(trans, log, dst_path, | |
2446 | path->nodes[0], path->slots[0], | |
2447 | &tmp); | |
4a500fd1 YZ |
2448 | if (ret) { |
2449 | err = ret; | |
2450 | goto done; | |
2451 | } | |
e02119d5 CM |
2452 | } |
2453 | } | |
b3b4aa74 | 2454 | btrfs_release_path(path); |
e02119d5 CM |
2455 | |
2456 | /* find the first key from this transaction again */ | |
2457 | ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0); | |
2458 | if (ret != 0) { | |
2459 | WARN_ON(1); | |
2460 | goto done; | |
2461 | } | |
2462 | ||
2463 | /* | |
2464 | * we have a block from this transaction, log every item in it | |
2465 | * from our directory | |
2466 | */ | |
d397712b | 2467 | while (1) { |
e02119d5 CM |
2468 | struct btrfs_key tmp; |
2469 | src = path->nodes[0]; | |
2470 | nritems = btrfs_header_nritems(src); | |
2471 | for (i = path->slots[0]; i < nritems; i++) { | |
2472 | btrfs_item_key_to_cpu(src, &min_key, i); | |
2473 | ||
33345d01 | 2474 | if (min_key.objectid != ino || min_key.type != key_type) |
e02119d5 CM |
2475 | goto done; |
2476 | ret = overwrite_item(trans, log, dst_path, src, i, | |
2477 | &min_key); | |
4a500fd1 YZ |
2478 | if (ret) { |
2479 | err = ret; | |
2480 | goto done; | |
2481 | } | |
e02119d5 CM |
2482 | } |
2483 | path->slots[0] = nritems; | |
2484 | ||
2485 | /* | |
2486 | * look ahead to the next item and see if it is also | |
2487 | * from this directory and from this transaction | |
2488 | */ | |
2489 | ret = btrfs_next_leaf(root, path); | |
2490 | if (ret == 1) { | |
2491 | last_offset = (u64)-1; | |
2492 | goto done; | |
2493 | } | |
2494 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); | |
33345d01 | 2495 | if (tmp.objectid != ino || tmp.type != key_type) { |
e02119d5 CM |
2496 | last_offset = (u64)-1; |
2497 | goto done; | |
2498 | } | |
2499 | if (btrfs_header_generation(path->nodes[0]) != trans->transid) { | |
2500 | ret = overwrite_item(trans, log, dst_path, | |
2501 | path->nodes[0], path->slots[0], | |
2502 | &tmp); | |
4a500fd1 YZ |
2503 | if (ret) |
2504 | err = ret; | |
2505 | else | |
2506 | last_offset = tmp.offset; | |
e02119d5 CM |
2507 | goto done; |
2508 | } | |
2509 | } | |
2510 | done: | |
b3b4aa74 DS |
2511 | btrfs_release_path(path); |
2512 | btrfs_release_path(dst_path); | |
e02119d5 | 2513 | |
4a500fd1 YZ |
2514 | if (err == 0) { |
2515 | *last_offset_ret = last_offset; | |
2516 | /* | |
2517 | * insert the log range keys to indicate where the log | |
2518 | * is valid | |
2519 | */ | |
2520 | ret = insert_dir_log_key(trans, log, path, key_type, | |
33345d01 | 2521 | ino, first_offset, last_offset); |
4a500fd1 YZ |
2522 | if (ret) |
2523 | err = ret; | |
2524 | } | |
2525 | return err; | |
e02119d5 CM |
2526 | } |
2527 | ||
2528 | /* | |
2529 | * logging directories is very similar to logging inodes, We find all the items | |
2530 | * from the current transaction and write them to the log. | |
2531 | * | |
2532 | * The recovery code scans the directory in the subvolume, and if it finds a | |
2533 | * key in the range logged that is not present in the log tree, then it means | |
2534 | * that dir entry was unlinked during the transaction. | |
2535 | * | |
2536 | * In order for that scan to work, we must include one key smaller than | |
2537 | * the smallest logged by this transaction and one key larger than the largest | |
2538 | * key logged by this transaction. | |
2539 | */ | |
2540 | static noinline int log_directory_changes(struct btrfs_trans_handle *trans, | |
2541 | struct btrfs_root *root, struct inode *inode, | |
2542 | struct btrfs_path *path, | |
2543 | struct btrfs_path *dst_path) | |
2544 | { | |
2545 | u64 min_key; | |
2546 | u64 max_key; | |
2547 | int ret; | |
2548 | int key_type = BTRFS_DIR_ITEM_KEY; | |
2549 | ||
2550 | again: | |
2551 | min_key = 0; | |
2552 | max_key = 0; | |
d397712b | 2553 | while (1) { |
e02119d5 CM |
2554 | ret = log_dir_items(trans, root, inode, path, |
2555 | dst_path, key_type, min_key, | |
2556 | &max_key); | |
4a500fd1 YZ |
2557 | if (ret) |
2558 | return ret; | |
e02119d5 CM |
2559 | if (max_key == (u64)-1) |
2560 | break; | |
2561 | min_key = max_key + 1; | |
2562 | } | |
2563 | ||
2564 | if (key_type == BTRFS_DIR_ITEM_KEY) { | |
2565 | key_type = BTRFS_DIR_INDEX_KEY; | |
2566 | goto again; | |
2567 | } | |
2568 | return 0; | |
2569 | } | |
2570 | ||
2571 | /* | |
2572 | * a helper function to drop items from the log before we relog an | |
2573 | * inode. max_key_type indicates the highest item type to remove. | |
2574 | * This cannot be run for file data extents because it does not | |
2575 | * free the extents they point to. | |
2576 | */ | |
2577 | static int drop_objectid_items(struct btrfs_trans_handle *trans, | |
2578 | struct btrfs_root *log, | |
2579 | struct btrfs_path *path, | |
2580 | u64 objectid, int max_key_type) | |
2581 | { | |
2582 | int ret; | |
2583 | struct btrfs_key key; | |
2584 | struct btrfs_key found_key; | |
2585 | ||
2586 | key.objectid = objectid; | |
2587 | key.type = max_key_type; | |
2588 | key.offset = (u64)-1; | |
2589 | ||
d397712b | 2590 | while (1) { |
e02119d5 | 2591 | ret = btrfs_search_slot(trans, log, &key, path, -1, 1); |
4a500fd1 YZ |
2592 | BUG_ON(ret == 0); |
2593 | if (ret < 0) | |
e02119d5 CM |
2594 | break; |
2595 | ||
2596 | if (path->slots[0] == 0) | |
2597 | break; | |
2598 | ||
2599 | path->slots[0]--; | |
2600 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
2601 | path->slots[0]); | |
2602 | ||
2603 | if (found_key.objectid != objectid) | |
2604 | break; | |
2605 | ||
2606 | ret = btrfs_del_item(trans, log, path); | |
65a246c5 TI |
2607 | if (ret) |
2608 | break; | |
b3b4aa74 | 2609 | btrfs_release_path(path); |
e02119d5 | 2610 | } |
b3b4aa74 | 2611 | btrfs_release_path(path); |
4a500fd1 | 2612 | return ret; |
e02119d5 CM |
2613 | } |
2614 | ||
31ff1cd2 CM |
2615 | static noinline int copy_items(struct btrfs_trans_handle *trans, |
2616 | struct btrfs_root *log, | |
2617 | struct btrfs_path *dst_path, | |
2618 | struct extent_buffer *src, | |
2619 | int start_slot, int nr, int inode_only) | |
2620 | { | |
2621 | unsigned long src_offset; | |
2622 | unsigned long dst_offset; | |
2623 | struct btrfs_file_extent_item *extent; | |
2624 | struct btrfs_inode_item *inode_item; | |
2625 | int ret; | |
2626 | struct btrfs_key *ins_keys; | |
2627 | u32 *ins_sizes; | |
2628 | char *ins_data; | |
2629 | int i; | |
d20f7043 CM |
2630 | struct list_head ordered_sums; |
2631 | ||
2632 | INIT_LIST_HEAD(&ordered_sums); | |
31ff1cd2 CM |
2633 | |
2634 | ins_data = kmalloc(nr * sizeof(struct btrfs_key) + | |
2635 | nr * sizeof(u32), GFP_NOFS); | |
2a29edc6 | 2636 | if (!ins_data) |
2637 | return -ENOMEM; | |
2638 | ||
31ff1cd2 CM |
2639 | ins_sizes = (u32 *)ins_data; |
2640 | ins_keys = (struct btrfs_key *)(ins_data + nr * sizeof(u32)); | |
2641 | ||
2642 | for (i = 0; i < nr; i++) { | |
2643 | ins_sizes[i] = btrfs_item_size_nr(src, i + start_slot); | |
2644 | btrfs_item_key_to_cpu(src, ins_keys + i, i + start_slot); | |
2645 | } | |
2646 | ret = btrfs_insert_empty_items(trans, log, dst_path, | |
2647 | ins_keys, ins_sizes, nr); | |
4a500fd1 YZ |
2648 | if (ret) { |
2649 | kfree(ins_data); | |
2650 | return ret; | |
2651 | } | |
31ff1cd2 | 2652 | |
5d4f98a2 | 2653 | for (i = 0; i < nr; i++, dst_path->slots[0]++) { |
31ff1cd2 CM |
2654 | dst_offset = btrfs_item_ptr_offset(dst_path->nodes[0], |
2655 | dst_path->slots[0]); | |
2656 | ||
2657 | src_offset = btrfs_item_ptr_offset(src, start_slot + i); | |
2658 | ||
2659 | copy_extent_buffer(dst_path->nodes[0], src, dst_offset, | |
2660 | src_offset, ins_sizes[i]); | |
2661 | ||
2662 | if (inode_only == LOG_INODE_EXISTS && | |
2663 | ins_keys[i].type == BTRFS_INODE_ITEM_KEY) { | |
2664 | inode_item = btrfs_item_ptr(dst_path->nodes[0], | |
2665 | dst_path->slots[0], | |
2666 | struct btrfs_inode_item); | |
2667 | btrfs_set_inode_size(dst_path->nodes[0], inode_item, 0); | |
2668 | ||
2669 | /* set the generation to zero so the recover code | |
2670 | * can tell the difference between an logging | |
2671 | * just to say 'this inode exists' and a logging | |
2672 | * to say 'update this inode with these values' | |
2673 | */ | |
2674 | btrfs_set_inode_generation(dst_path->nodes[0], | |
2675 | inode_item, 0); | |
2676 | } | |
2677 | /* take a reference on file data extents so that truncates | |
2678 | * or deletes of this inode don't have to relog the inode | |
2679 | * again | |
2680 | */ | |
2681 | if (btrfs_key_type(ins_keys + i) == BTRFS_EXTENT_DATA_KEY) { | |
2682 | int found_type; | |
2683 | extent = btrfs_item_ptr(src, start_slot + i, | |
2684 | struct btrfs_file_extent_item); | |
2685 | ||
8e531cdf | 2686 | if (btrfs_file_extent_generation(src, extent) < trans->transid) |
2687 | continue; | |
2688 | ||
31ff1cd2 | 2689 | found_type = btrfs_file_extent_type(src, extent); |
d899e052 YZ |
2690 | if (found_type == BTRFS_FILE_EXTENT_REG || |
2691 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
5d4f98a2 YZ |
2692 | u64 ds, dl, cs, cl; |
2693 | ds = btrfs_file_extent_disk_bytenr(src, | |
2694 | extent); | |
2695 | /* ds == 0 is a hole */ | |
2696 | if (ds == 0) | |
2697 | continue; | |
2698 | ||
2699 | dl = btrfs_file_extent_disk_num_bytes(src, | |
2700 | extent); | |
2701 | cs = btrfs_file_extent_offset(src, extent); | |
2702 | cl = btrfs_file_extent_num_bytes(src, | |
a419aef8 | 2703 | extent); |
580afd76 CM |
2704 | if (btrfs_file_extent_compression(src, |
2705 | extent)) { | |
2706 | cs = 0; | |
2707 | cl = dl; | |
2708 | } | |
5d4f98a2 YZ |
2709 | |
2710 | ret = btrfs_lookup_csums_range( | |
2711 | log->fs_info->csum_root, | |
2712 | ds + cs, ds + cs + cl - 1, | |
a2de733c | 2713 | &ordered_sums, 0); |
5d4f98a2 | 2714 | BUG_ON(ret); |
31ff1cd2 CM |
2715 | } |
2716 | } | |
31ff1cd2 CM |
2717 | } |
2718 | ||
2719 | btrfs_mark_buffer_dirty(dst_path->nodes[0]); | |
b3b4aa74 | 2720 | btrfs_release_path(dst_path); |
31ff1cd2 | 2721 | kfree(ins_data); |
d20f7043 CM |
2722 | |
2723 | /* | |
2724 | * we have to do this after the loop above to avoid changing the | |
2725 | * log tree while trying to change the log tree. | |
2726 | */ | |
4a500fd1 | 2727 | ret = 0; |
d397712b | 2728 | while (!list_empty(&ordered_sums)) { |
d20f7043 CM |
2729 | struct btrfs_ordered_sum *sums = list_entry(ordered_sums.next, |
2730 | struct btrfs_ordered_sum, | |
2731 | list); | |
4a500fd1 YZ |
2732 | if (!ret) |
2733 | ret = btrfs_csum_file_blocks(trans, log, sums); | |
d20f7043 CM |
2734 | list_del(&sums->list); |
2735 | kfree(sums); | |
2736 | } | |
4a500fd1 | 2737 | return ret; |
31ff1cd2 CM |
2738 | } |
2739 | ||
e02119d5 CM |
2740 | /* log a single inode in the tree log. |
2741 | * At least one parent directory for this inode must exist in the tree | |
2742 | * or be logged already. | |
2743 | * | |
2744 | * Any items from this inode changed by the current transaction are copied | |
2745 | * to the log tree. An extra reference is taken on any extents in this | |
2746 | * file, allowing us to avoid a whole pile of corner cases around logging | |
2747 | * blocks that have been removed from the tree. | |
2748 | * | |
2749 | * See LOG_INODE_ALL and related defines for a description of what inode_only | |
2750 | * does. | |
2751 | * | |
2752 | * This handles both files and directories. | |
2753 | */ | |
12fcfd22 | 2754 | static int btrfs_log_inode(struct btrfs_trans_handle *trans, |
e02119d5 CM |
2755 | struct btrfs_root *root, struct inode *inode, |
2756 | int inode_only) | |
2757 | { | |
2758 | struct btrfs_path *path; | |
2759 | struct btrfs_path *dst_path; | |
2760 | struct btrfs_key min_key; | |
2761 | struct btrfs_key max_key; | |
2762 | struct btrfs_root *log = root->log_root; | |
31ff1cd2 | 2763 | struct extent_buffer *src = NULL; |
4a500fd1 | 2764 | int err = 0; |
e02119d5 | 2765 | int ret; |
3a5f1d45 | 2766 | int nritems; |
31ff1cd2 CM |
2767 | int ins_start_slot = 0; |
2768 | int ins_nr; | |
33345d01 | 2769 | u64 ino = btrfs_ino(inode); |
e02119d5 CM |
2770 | |
2771 | log = root->log_root; | |
2772 | ||
2773 | path = btrfs_alloc_path(); | |
5df67083 TI |
2774 | if (!path) |
2775 | return -ENOMEM; | |
e02119d5 | 2776 | dst_path = btrfs_alloc_path(); |
5df67083 TI |
2777 | if (!dst_path) { |
2778 | btrfs_free_path(path); | |
2779 | return -ENOMEM; | |
2780 | } | |
e02119d5 | 2781 | |
33345d01 | 2782 | min_key.objectid = ino; |
e02119d5 CM |
2783 | min_key.type = BTRFS_INODE_ITEM_KEY; |
2784 | min_key.offset = 0; | |
2785 | ||
33345d01 | 2786 | max_key.objectid = ino; |
12fcfd22 CM |
2787 | |
2788 | /* today the code can only do partial logging of directories */ | |
2789 | if (!S_ISDIR(inode->i_mode)) | |
2790 | inode_only = LOG_INODE_ALL; | |
2791 | ||
e02119d5 CM |
2792 | if (inode_only == LOG_INODE_EXISTS || S_ISDIR(inode->i_mode)) |
2793 | max_key.type = BTRFS_XATTR_ITEM_KEY; | |
2794 | else | |
2795 | max_key.type = (u8)-1; | |
2796 | max_key.offset = (u64)-1; | |
2797 | ||
16cdcec7 MX |
2798 | ret = btrfs_commit_inode_delayed_items(trans, inode); |
2799 | if (ret) { | |
2800 | btrfs_free_path(path); | |
2801 | btrfs_free_path(dst_path); | |
2802 | return ret; | |
2803 | } | |
2804 | ||
e02119d5 CM |
2805 | mutex_lock(&BTRFS_I(inode)->log_mutex); |
2806 | ||
2807 | /* | |
2808 | * a brute force approach to making sure we get the most uptodate | |
2809 | * copies of everything. | |
2810 | */ | |
2811 | if (S_ISDIR(inode->i_mode)) { | |
2812 | int max_key_type = BTRFS_DIR_LOG_INDEX_KEY; | |
2813 | ||
2814 | if (inode_only == LOG_INODE_EXISTS) | |
2815 | max_key_type = BTRFS_XATTR_ITEM_KEY; | |
33345d01 | 2816 | ret = drop_objectid_items(trans, log, path, ino, max_key_type); |
e02119d5 CM |
2817 | } else { |
2818 | ret = btrfs_truncate_inode_items(trans, log, inode, 0, 0); | |
2819 | } | |
4a500fd1 YZ |
2820 | if (ret) { |
2821 | err = ret; | |
2822 | goto out_unlock; | |
2823 | } | |
e02119d5 CM |
2824 | path->keep_locks = 1; |
2825 | ||
d397712b | 2826 | while (1) { |
31ff1cd2 | 2827 | ins_nr = 0; |
e02119d5 CM |
2828 | ret = btrfs_search_forward(root, &min_key, &max_key, |
2829 | path, 0, trans->transid); | |
2830 | if (ret != 0) | |
2831 | break; | |
3a5f1d45 | 2832 | again: |
31ff1cd2 | 2833 | /* note, ins_nr might be > 0 here, cleanup outside the loop */ |
33345d01 | 2834 | if (min_key.objectid != ino) |
e02119d5 CM |
2835 | break; |
2836 | if (min_key.type > max_key.type) | |
2837 | break; | |
31ff1cd2 | 2838 | |
e02119d5 | 2839 | src = path->nodes[0]; |
31ff1cd2 CM |
2840 | if (ins_nr && ins_start_slot + ins_nr == path->slots[0]) { |
2841 | ins_nr++; | |
2842 | goto next_slot; | |
2843 | } else if (!ins_nr) { | |
2844 | ins_start_slot = path->slots[0]; | |
2845 | ins_nr = 1; | |
2846 | goto next_slot; | |
e02119d5 CM |
2847 | } |
2848 | ||
31ff1cd2 CM |
2849 | ret = copy_items(trans, log, dst_path, src, ins_start_slot, |
2850 | ins_nr, inode_only); | |
4a500fd1 YZ |
2851 | if (ret) { |
2852 | err = ret; | |
2853 | goto out_unlock; | |
2854 | } | |
31ff1cd2 CM |
2855 | ins_nr = 1; |
2856 | ins_start_slot = path->slots[0]; | |
2857 | next_slot: | |
e02119d5 | 2858 | |
3a5f1d45 CM |
2859 | nritems = btrfs_header_nritems(path->nodes[0]); |
2860 | path->slots[0]++; | |
2861 | if (path->slots[0] < nritems) { | |
2862 | btrfs_item_key_to_cpu(path->nodes[0], &min_key, | |
2863 | path->slots[0]); | |
2864 | goto again; | |
2865 | } | |
31ff1cd2 CM |
2866 | if (ins_nr) { |
2867 | ret = copy_items(trans, log, dst_path, src, | |
2868 | ins_start_slot, | |
2869 | ins_nr, inode_only); | |
4a500fd1 YZ |
2870 | if (ret) { |
2871 | err = ret; | |
2872 | goto out_unlock; | |
2873 | } | |
31ff1cd2 CM |
2874 | ins_nr = 0; |
2875 | } | |
b3b4aa74 | 2876 | btrfs_release_path(path); |
3a5f1d45 | 2877 | |
e02119d5 CM |
2878 | if (min_key.offset < (u64)-1) |
2879 | min_key.offset++; | |
2880 | else if (min_key.type < (u8)-1) | |
2881 | min_key.type++; | |
2882 | else if (min_key.objectid < (u64)-1) | |
2883 | min_key.objectid++; | |
2884 | else | |
2885 | break; | |
2886 | } | |
31ff1cd2 CM |
2887 | if (ins_nr) { |
2888 | ret = copy_items(trans, log, dst_path, src, | |
2889 | ins_start_slot, | |
2890 | ins_nr, inode_only); | |
4a500fd1 YZ |
2891 | if (ret) { |
2892 | err = ret; | |
2893 | goto out_unlock; | |
2894 | } | |
31ff1cd2 CM |
2895 | ins_nr = 0; |
2896 | } | |
2897 | WARN_ON(ins_nr); | |
9623f9a3 | 2898 | if (inode_only == LOG_INODE_ALL && S_ISDIR(inode->i_mode)) { |
b3b4aa74 DS |
2899 | btrfs_release_path(path); |
2900 | btrfs_release_path(dst_path); | |
e02119d5 | 2901 | ret = log_directory_changes(trans, root, inode, path, dst_path); |
4a500fd1 YZ |
2902 | if (ret) { |
2903 | err = ret; | |
2904 | goto out_unlock; | |
2905 | } | |
e02119d5 | 2906 | } |
3a5f1d45 | 2907 | BTRFS_I(inode)->logged_trans = trans->transid; |
4a500fd1 | 2908 | out_unlock: |
e02119d5 CM |
2909 | mutex_unlock(&BTRFS_I(inode)->log_mutex); |
2910 | ||
2911 | btrfs_free_path(path); | |
2912 | btrfs_free_path(dst_path); | |
4a500fd1 | 2913 | return err; |
e02119d5 CM |
2914 | } |
2915 | ||
12fcfd22 CM |
2916 | /* |
2917 | * follow the dentry parent pointers up the chain and see if any | |
2918 | * of the directories in it require a full commit before they can | |
2919 | * be logged. Returns zero if nothing special needs to be done or 1 if | |
2920 | * a full commit is required. | |
2921 | */ | |
2922 | static noinline int check_parent_dirs_for_sync(struct btrfs_trans_handle *trans, | |
2923 | struct inode *inode, | |
2924 | struct dentry *parent, | |
2925 | struct super_block *sb, | |
2926 | u64 last_committed) | |
e02119d5 | 2927 | { |
12fcfd22 CM |
2928 | int ret = 0; |
2929 | struct btrfs_root *root; | |
6a912213 | 2930 | struct dentry *old_parent = NULL; |
e02119d5 | 2931 | |
af4176b4 CM |
2932 | /* |
2933 | * for regular files, if its inode is already on disk, we don't | |
2934 | * have to worry about the parents at all. This is because | |
2935 | * we can use the last_unlink_trans field to record renames | |
2936 | * and other fun in this file. | |
2937 | */ | |
2938 | if (S_ISREG(inode->i_mode) && | |
2939 | BTRFS_I(inode)->generation <= last_committed && | |
2940 | BTRFS_I(inode)->last_unlink_trans <= last_committed) | |
2941 | goto out; | |
2942 | ||
12fcfd22 CM |
2943 | if (!S_ISDIR(inode->i_mode)) { |
2944 | if (!parent || !parent->d_inode || sb != parent->d_inode->i_sb) | |
2945 | goto out; | |
2946 | inode = parent->d_inode; | |
2947 | } | |
2948 | ||
2949 | while (1) { | |
2950 | BTRFS_I(inode)->logged_trans = trans->transid; | |
2951 | smp_mb(); | |
2952 | ||
2953 | if (BTRFS_I(inode)->last_unlink_trans > last_committed) { | |
2954 | root = BTRFS_I(inode)->root; | |
2955 | ||
2956 | /* | |
2957 | * make sure any commits to the log are forced | |
2958 | * to be full commits | |
2959 | */ | |
2960 | root->fs_info->last_trans_log_full_commit = | |
2961 | trans->transid; | |
2962 | ret = 1; | |
2963 | break; | |
2964 | } | |
2965 | ||
2966 | if (!parent || !parent->d_inode || sb != parent->d_inode->i_sb) | |
2967 | break; | |
2968 | ||
76dda93c | 2969 | if (IS_ROOT(parent)) |
12fcfd22 CM |
2970 | break; |
2971 | ||
6a912213 JB |
2972 | parent = dget_parent(parent); |
2973 | dput(old_parent); | |
2974 | old_parent = parent; | |
12fcfd22 CM |
2975 | inode = parent->d_inode; |
2976 | ||
2977 | } | |
6a912213 | 2978 | dput(old_parent); |
12fcfd22 | 2979 | out: |
e02119d5 CM |
2980 | return ret; |
2981 | } | |
2982 | ||
257c62e1 CM |
2983 | static int inode_in_log(struct btrfs_trans_handle *trans, |
2984 | struct inode *inode) | |
2985 | { | |
2986 | struct btrfs_root *root = BTRFS_I(inode)->root; | |
2987 | int ret = 0; | |
2988 | ||
2989 | mutex_lock(&root->log_mutex); | |
2990 | if (BTRFS_I(inode)->logged_trans == trans->transid && | |
2991 | BTRFS_I(inode)->last_sub_trans <= root->last_log_commit) | |
2992 | ret = 1; | |
2993 | mutex_unlock(&root->log_mutex); | |
2994 | return ret; | |
2995 | } | |
2996 | ||
2997 | ||
e02119d5 CM |
2998 | /* |
2999 | * helper function around btrfs_log_inode to make sure newly created | |
3000 | * parent directories also end up in the log. A minimal inode and backref | |
3001 | * only logging is done of any parent directories that are older than | |
3002 | * the last committed transaction | |
3003 | */ | |
12fcfd22 CM |
3004 | int btrfs_log_inode_parent(struct btrfs_trans_handle *trans, |
3005 | struct btrfs_root *root, struct inode *inode, | |
3006 | struct dentry *parent, int exists_only) | |
e02119d5 | 3007 | { |
12fcfd22 | 3008 | int inode_only = exists_only ? LOG_INODE_EXISTS : LOG_INODE_ALL; |
e02119d5 | 3009 | struct super_block *sb; |
6a912213 | 3010 | struct dentry *old_parent = NULL; |
12fcfd22 CM |
3011 | int ret = 0; |
3012 | u64 last_committed = root->fs_info->last_trans_committed; | |
3013 | ||
3014 | sb = inode->i_sb; | |
3015 | ||
3a5e1404 SW |
3016 | if (btrfs_test_opt(root, NOTREELOG)) { |
3017 | ret = 1; | |
3018 | goto end_no_trans; | |
3019 | } | |
3020 | ||
12fcfd22 CM |
3021 | if (root->fs_info->last_trans_log_full_commit > |
3022 | root->fs_info->last_trans_committed) { | |
3023 | ret = 1; | |
3024 | goto end_no_trans; | |
3025 | } | |
3026 | ||
76dda93c YZ |
3027 | if (root != BTRFS_I(inode)->root || |
3028 | btrfs_root_refs(&root->root_item) == 0) { | |
3029 | ret = 1; | |
3030 | goto end_no_trans; | |
3031 | } | |
3032 | ||
12fcfd22 CM |
3033 | ret = check_parent_dirs_for_sync(trans, inode, parent, |
3034 | sb, last_committed); | |
3035 | if (ret) | |
3036 | goto end_no_trans; | |
e02119d5 | 3037 | |
257c62e1 CM |
3038 | if (inode_in_log(trans, inode)) { |
3039 | ret = BTRFS_NO_LOG_SYNC; | |
3040 | goto end_no_trans; | |
3041 | } | |
3042 | ||
4a500fd1 YZ |
3043 | ret = start_log_trans(trans, root); |
3044 | if (ret) | |
3045 | goto end_trans; | |
e02119d5 | 3046 | |
12fcfd22 | 3047 | ret = btrfs_log_inode(trans, root, inode, inode_only); |
4a500fd1 YZ |
3048 | if (ret) |
3049 | goto end_trans; | |
12fcfd22 | 3050 | |
af4176b4 CM |
3051 | /* |
3052 | * for regular files, if its inode is already on disk, we don't | |
3053 | * have to worry about the parents at all. This is because | |
3054 | * we can use the last_unlink_trans field to record renames | |
3055 | * and other fun in this file. | |
3056 | */ | |
3057 | if (S_ISREG(inode->i_mode) && | |
3058 | BTRFS_I(inode)->generation <= last_committed && | |
4a500fd1 YZ |
3059 | BTRFS_I(inode)->last_unlink_trans <= last_committed) { |
3060 | ret = 0; | |
3061 | goto end_trans; | |
3062 | } | |
af4176b4 CM |
3063 | |
3064 | inode_only = LOG_INODE_EXISTS; | |
12fcfd22 CM |
3065 | while (1) { |
3066 | if (!parent || !parent->d_inode || sb != parent->d_inode->i_sb) | |
e02119d5 CM |
3067 | break; |
3068 | ||
12fcfd22 | 3069 | inode = parent->d_inode; |
76dda93c YZ |
3070 | if (root != BTRFS_I(inode)->root) |
3071 | break; | |
3072 | ||
12fcfd22 CM |
3073 | if (BTRFS_I(inode)->generation > |
3074 | root->fs_info->last_trans_committed) { | |
3075 | ret = btrfs_log_inode(trans, root, inode, inode_only); | |
4a500fd1 YZ |
3076 | if (ret) |
3077 | goto end_trans; | |
12fcfd22 | 3078 | } |
76dda93c | 3079 | if (IS_ROOT(parent)) |
e02119d5 | 3080 | break; |
12fcfd22 | 3081 | |
6a912213 JB |
3082 | parent = dget_parent(parent); |
3083 | dput(old_parent); | |
3084 | old_parent = parent; | |
e02119d5 | 3085 | } |
12fcfd22 | 3086 | ret = 0; |
4a500fd1 | 3087 | end_trans: |
6a912213 | 3088 | dput(old_parent); |
4a500fd1 YZ |
3089 | if (ret < 0) { |
3090 | BUG_ON(ret != -ENOSPC); | |
3091 | root->fs_info->last_trans_log_full_commit = trans->transid; | |
3092 | ret = 1; | |
3093 | } | |
12fcfd22 CM |
3094 | btrfs_end_log_trans(root); |
3095 | end_no_trans: | |
3096 | return ret; | |
e02119d5 CM |
3097 | } |
3098 | ||
3099 | /* | |
3100 | * it is not safe to log dentry if the chunk root has added new | |
3101 | * chunks. This returns 0 if the dentry was logged, and 1 otherwise. | |
3102 | * If this returns 1, you must commit the transaction to safely get your | |
3103 | * data on disk. | |
3104 | */ | |
3105 | int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans, | |
3106 | struct btrfs_root *root, struct dentry *dentry) | |
3107 | { | |
6a912213 JB |
3108 | struct dentry *parent = dget_parent(dentry); |
3109 | int ret; | |
3110 | ||
3111 | ret = btrfs_log_inode_parent(trans, root, dentry->d_inode, parent, 0); | |
3112 | dput(parent); | |
3113 | ||
3114 | return ret; | |
e02119d5 CM |
3115 | } |
3116 | ||
3117 | /* | |
3118 | * should be called during mount to recover any replay any log trees | |
3119 | * from the FS | |
3120 | */ | |
3121 | int btrfs_recover_log_trees(struct btrfs_root *log_root_tree) | |
3122 | { | |
3123 | int ret; | |
3124 | struct btrfs_path *path; | |
3125 | struct btrfs_trans_handle *trans; | |
3126 | struct btrfs_key key; | |
3127 | struct btrfs_key found_key; | |
3128 | struct btrfs_key tmp_key; | |
3129 | struct btrfs_root *log; | |
3130 | struct btrfs_fs_info *fs_info = log_root_tree->fs_info; | |
3131 | struct walk_control wc = { | |
3132 | .process_func = process_one_buffer, | |
3133 | .stage = 0, | |
3134 | }; | |
3135 | ||
e02119d5 | 3136 | path = btrfs_alloc_path(); |
db5b493a TI |
3137 | if (!path) |
3138 | return -ENOMEM; | |
3139 | ||
3140 | fs_info->log_root_recovering = 1; | |
e02119d5 | 3141 | |
4a500fd1 | 3142 | trans = btrfs_start_transaction(fs_info->tree_root, 0); |
98d5dc13 | 3143 | BUG_ON(IS_ERR(trans)); |
e02119d5 CM |
3144 | |
3145 | wc.trans = trans; | |
3146 | wc.pin = 1; | |
3147 | ||
db5b493a TI |
3148 | ret = walk_log_tree(trans, log_root_tree, &wc); |
3149 | BUG_ON(ret); | |
e02119d5 CM |
3150 | |
3151 | again: | |
3152 | key.objectid = BTRFS_TREE_LOG_OBJECTID; | |
3153 | key.offset = (u64)-1; | |
3154 | btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); | |
3155 | ||
d397712b | 3156 | while (1) { |
e02119d5 CM |
3157 | ret = btrfs_search_slot(NULL, log_root_tree, &key, path, 0, 0); |
3158 | if (ret < 0) | |
3159 | break; | |
3160 | if (ret > 0) { | |
3161 | if (path->slots[0] == 0) | |
3162 | break; | |
3163 | path->slots[0]--; | |
3164 | } | |
3165 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
3166 | path->slots[0]); | |
b3b4aa74 | 3167 | btrfs_release_path(path); |
e02119d5 CM |
3168 | if (found_key.objectid != BTRFS_TREE_LOG_OBJECTID) |
3169 | break; | |
3170 | ||
3171 | log = btrfs_read_fs_root_no_radix(log_root_tree, | |
3172 | &found_key); | |
db5b493a | 3173 | BUG_ON(IS_ERR(log)); |
e02119d5 CM |
3174 | |
3175 | tmp_key.objectid = found_key.offset; | |
3176 | tmp_key.type = BTRFS_ROOT_ITEM_KEY; | |
3177 | tmp_key.offset = (u64)-1; | |
3178 | ||
3179 | wc.replay_dest = btrfs_read_fs_root_no_name(fs_info, &tmp_key); | |
3ed4498c | 3180 | BUG_ON(IS_ERR_OR_NULL(wc.replay_dest)); |
e02119d5 | 3181 | |
07d400a6 | 3182 | wc.replay_dest->log_root = log; |
5d4f98a2 | 3183 | btrfs_record_root_in_trans(trans, wc.replay_dest); |
e02119d5 CM |
3184 | ret = walk_log_tree(trans, log, &wc); |
3185 | BUG_ON(ret); | |
3186 | ||
3187 | if (wc.stage == LOG_WALK_REPLAY_ALL) { | |
3188 | ret = fixup_inode_link_counts(trans, wc.replay_dest, | |
3189 | path); | |
3190 | BUG_ON(ret); | |
3191 | } | |
3192 | ||
3193 | key.offset = found_key.offset - 1; | |
07d400a6 | 3194 | wc.replay_dest->log_root = NULL; |
e02119d5 | 3195 | free_extent_buffer(log->node); |
b263c2c8 | 3196 | free_extent_buffer(log->commit_root); |
e02119d5 CM |
3197 | kfree(log); |
3198 | ||
3199 | if (found_key.offset == 0) | |
3200 | break; | |
3201 | } | |
b3b4aa74 | 3202 | btrfs_release_path(path); |
e02119d5 CM |
3203 | |
3204 | /* step one is to pin it all, step two is to replay just inodes */ | |
3205 | if (wc.pin) { | |
3206 | wc.pin = 0; | |
3207 | wc.process_func = replay_one_buffer; | |
3208 | wc.stage = LOG_WALK_REPLAY_INODES; | |
3209 | goto again; | |
3210 | } | |
3211 | /* step three is to replay everything */ | |
3212 | if (wc.stage < LOG_WALK_REPLAY_ALL) { | |
3213 | wc.stage++; | |
3214 | goto again; | |
3215 | } | |
3216 | ||
3217 | btrfs_free_path(path); | |
3218 | ||
3219 | free_extent_buffer(log_root_tree->node); | |
3220 | log_root_tree->log_root = NULL; | |
3221 | fs_info->log_root_recovering = 0; | |
3222 | ||
3223 | /* step 4: commit the transaction, which also unpins the blocks */ | |
3224 | btrfs_commit_transaction(trans, fs_info->tree_root); | |
3225 | ||
3226 | kfree(log_root_tree); | |
3227 | return 0; | |
3228 | } | |
12fcfd22 CM |
3229 | |
3230 | /* | |
3231 | * there are some corner cases where we want to force a full | |
3232 | * commit instead of allowing a directory to be logged. | |
3233 | * | |
3234 | * They revolve around files there were unlinked from the directory, and | |
3235 | * this function updates the parent directory so that a full commit is | |
3236 | * properly done if it is fsync'd later after the unlinks are done. | |
3237 | */ | |
3238 | void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans, | |
3239 | struct inode *dir, struct inode *inode, | |
3240 | int for_rename) | |
3241 | { | |
af4176b4 CM |
3242 | /* |
3243 | * when we're logging a file, if it hasn't been renamed | |
3244 | * or unlinked, and its inode is fully committed on disk, | |
3245 | * we don't have to worry about walking up the directory chain | |
3246 | * to log its parents. | |
3247 | * | |
3248 | * So, we use the last_unlink_trans field to put this transid | |
3249 | * into the file. When the file is logged we check it and | |
3250 | * don't log the parents if the file is fully on disk. | |
3251 | */ | |
3252 | if (S_ISREG(inode->i_mode)) | |
3253 | BTRFS_I(inode)->last_unlink_trans = trans->transid; | |
3254 | ||
12fcfd22 CM |
3255 | /* |
3256 | * if this directory was already logged any new | |
3257 | * names for this file/dir will get recorded | |
3258 | */ | |
3259 | smp_mb(); | |
3260 | if (BTRFS_I(dir)->logged_trans == trans->transid) | |
3261 | return; | |
3262 | ||
3263 | /* | |
3264 | * if the inode we're about to unlink was logged, | |
3265 | * the log will be properly updated for any new names | |
3266 | */ | |
3267 | if (BTRFS_I(inode)->logged_trans == trans->transid) | |
3268 | return; | |
3269 | ||
3270 | /* | |
3271 | * when renaming files across directories, if the directory | |
3272 | * there we're unlinking from gets fsync'd later on, there's | |
3273 | * no way to find the destination directory later and fsync it | |
3274 | * properly. So, we have to be conservative and force commits | |
3275 | * so the new name gets discovered. | |
3276 | */ | |
3277 | if (for_rename) | |
3278 | goto record; | |
3279 | ||
3280 | /* we can safely do the unlink without any special recording */ | |
3281 | return; | |
3282 | ||
3283 | record: | |
3284 | BTRFS_I(dir)->last_unlink_trans = trans->transid; | |
3285 | } | |
3286 | ||
3287 | /* | |
3288 | * Call this after adding a new name for a file and it will properly | |
3289 | * update the log to reflect the new name. | |
3290 | * | |
3291 | * It will return zero if all goes well, and it will return 1 if a | |
3292 | * full transaction commit is required. | |
3293 | */ | |
3294 | int btrfs_log_new_name(struct btrfs_trans_handle *trans, | |
3295 | struct inode *inode, struct inode *old_dir, | |
3296 | struct dentry *parent) | |
3297 | { | |
3298 | struct btrfs_root * root = BTRFS_I(inode)->root; | |
3299 | ||
af4176b4 CM |
3300 | /* |
3301 | * this will force the logging code to walk the dentry chain | |
3302 | * up for the file | |
3303 | */ | |
3304 | if (S_ISREG(inode->i_mode)) | |
3305 | BTRFS_I(inode)->last_unlink_trans = trans->transid; | |
3306 | ||
12fcfd22 CM |
3307 | /* |
3308 | * if this inode hasn't been logged and directory we're renaming it | |
3309 | * from hasn't been logged, we don't need to log it | |
3310 | */ | |
3311 | if (BTRFS_I(inode)->logged_trans <= | |
3312 | root->fs_info->last_trans_committed && | |
3313 | (!old_dir || BTRFS_I(old_dir)->logged_trans <= | |
3314 | root->fs_info->last_trans_committed)) | |
3315 | return 0; | |
3316 | ||
3317 | return btrfs_log_inode_parent(trans, root, inode, parent, 1); | |
3318 | } | |
3319 |