]>
Commit | Line | Data |
---|---|---|
c1d7c514 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e02119d5 CM |
2 | /* |
3 | * Copyright (C) 2008 Oracle. All rights reserved. | |
e02119d5 CM |
4 | */ |
5 | ||
6 | #include <linux/sched.h> | |
5a0e3ad6 | 7 | #include <linux/slab.h> |
c6adc9cc | 8 | #include <linux/blkdev.h> |
5dc562c5 | 9 | #include <linux/list_sort.h> |
c7f88c4e | 10 | #include <linux/iversion.h> |
602cbe91 | 11 | #include "misc.h" |
9678c543 | 12 | #include "ctree.h" |
995946dd | 13 | #include "tree-log.h" |
e02119d5 CM |
14 | #include "disk-io.h" |
15 | #include "locking.h" | |
16 | #include "print-tree.h" | |
f186373f | 17 | #include "backref.h" |
ebb8765b | 18 | #include "compression.h" |
df2c95f3 | 19 | #include "qgroup.h" |
6787bb9f NB |
20 | #include "block-group.h" |
21 | #include "space-info.h" | |
e02119d5 CM |
22 | |
23 | /* magic values for the inode_only field in btrfs_log_inode: | |
24 | * | |
25 | * LOG_INODE_ALL means to log everything | |
26 | * LOG_INODE_EXISTS means to log just enough to recreate the inode | |
27 | * during log replay | |
28 | */ | |
e13976cf DS |
29 | enum { |
30 | LOG_INODE_ALL, | |
31 | LOG_INODE_EXISTS, | |
32 | LOG_OTHER_INODE, | |
33 | LOG_OTHER_INODE_ALL, | |
34 | }; | |
e02119d5 | 35 | |
12fcfd22 CM |
36 | /* |
37 | * directory trouble cases | |
38 | * | |
39 | * 1) on rename or unlink, if the inode being unlinked isn't in the fsync | |
40 | * log, we must force a full commit before doing an fsync of the directory | |
41 | * where the unlink was done. | |
42 | * ---> record transid of last unlink/rename per directory | |
43 | * | |
44 | * mkdir foo/some_dir | |
45 | * normal commit | |
46 | * rename foo/some_dir foo2/some_dir | |
47 | * mkdir foo/some_dir | |
48 | * fsync foo/some_dir/some_file | |
49 | * | |
50 | * The fsync above will unlink the original some_dir without recording | |
51 | * it in its new location (foo2). After a crash, some_dir will be gone | |
52 | * unless the fsync of some_file forces a full commit | |
53 | * | |
54 | * 2) we must log any new names for any file or dir that is in the fsync | |
55 | * log. ---> check inode while renaming/linking. | |
56 | * | |
57 | * 2a) we must log any new names for any file or dir during rename | |
58 | * when the directory they are being removed from was logged. | |
59 | * ---> check inode and old parent dir during rename | |
60 | * | |
61 | * 2a is actually the more important variant. With the extra logging | |
62 | * a crash might unlink the old name without recreating the new one | |
63 | * | |
64 | * 3) after a crash, we must go through any directories with a link count | |
65 | * of zero and redo the rm -rf | |
66 | * | |
67 | * mkdir f1/foo | |
68 | * normal commit | |
69 | * rm -rf f1/foo | |
70 | * fsync(f1) | |
71 | * | |
72 | * The directory f1 was fully removed from the FS, but fsync was never | |
73 | * called on f1, only its parent dir. After a crash the rm -rf must | |
74 | * be replayed. This must be able to recurse down the entire | |
75 | * directory tree. The inode link count fixup code takes care of the | |
76 | * ugly details. | |
77 | */ | |
78 | ||
e02119d5 CM |
79 | /* |
80 | * stages for the tree walking. The first | |
81 | * stage (0) is to only pin down the blocks we find | |
82 | * the second stage (1) is to make sure that all the inodes | |
83 | * we find in the log are created in the subvolume. | |
84 | * | |
85 | * The last stage is to deal with directories and links and extents | |
86 | * and all the other fun semantics | |
87 | */ | |
e13976cf DS |
88 | enum { |
89 | LOG_WALK_PIN_ONLY, | |
90 | LOG_WALK_REPLAY_INODES, | |
91 | LOG_WALK_REPLAY_DIR_INDEX, | |
92 | LOG_WALK_REPLAY_ALL, | |
93 | }; | |
e02119d5 | 94 | |
12fcfd22 | 95 | static int btrfs_log_inode(struct btrfs_trans_handle *trans, |
a59108a7 | 96 | struct btrfs_root *root, struct btrfs_inode *inode, |
49dae1bc | 97 | int inode_only, |
8407f553 | 98 | struct btrfs_log_ctx *ctx); |
ec051c0f YZ |
99 | static int link_to_fixup_dir(struct btrfs_trans_handle *trans, |
100 | struct btrfs_root *root, | |
101 | struct btrfs_path *path, u64 objectid); | |
12fcfd22 CM |
102 | static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, |
103 | struct btrfs_root *root, | |
104 | struct btrfs_root *log, | |
105 | struct btrfs_path *path, | |
106 | u64 dirid, int del_all); | |
e02119d5 CM |
107 | |
108 | /* | |
109 | * tree logging is a special write ahead log used to make sure that | |
110 | * fsyncs and O_SYNCs can happen without doing full tree commits. | |
111 | * | |
112 | * Full tree commits are expensive because they require commonly | |
113 | * modified blocks to be recowed, creating many dirty pages in the | |
114 | * extent tree an 4x-6x higher write load than ext3. | |
115 | * | |
116 | * Instead of doing a tree commit on every fsync, we use the | |
117 | * key ranges and transaction ids to find items for a given file or directory | |
118 | * that have changed in this transaction. Those items are copied into | |
119 | * a special tree (one per subvolume root), that tree is written to disk | |
120 | * and then the fsync is considered complete. | |
121 | * | |
122 | * After a crash, items are copied out of the log-tree back into the | |
123 | * subvolume tree. Any file data extents found are recorded in the extent | |
124 | * allocation tree, and the log-tree freed. | |
125 | * | |
126 | * The log tree is read three times, once to pin down all the extents it is | |
127 | * using in ram and once, once to create all the inodes logged in the tree | |
128 | * and once to do all the other items. | |
129 | */ | |
130 | ||
e02119d5 CM |
131 | /* |
132 | * start a sub transaction and setup the log tree | |
133 | * this increments the log tree writer count to make the people | |
134 | * syncing the tree wait for us to finish | |
135 | */ | |
136 | static int start_log_trans(struct btrfs_trans_handle *trans, | |
8b050d35 MX |
137 | struct btrfs_root *root, |
138 | struct btrfs_log_ctx *ctx) | |
e02119d5 | 139 | { |
0b246afa | 140 | struct btrfs_fs_info *fs_info = root->fs_info; |
34eb2a52 | 141 | int ret = 0; |
7237f183 YZ |
142 | |
143 | mutex_lock(&root->log_mutex); | |
34eb2a52 | 144 | |
7237f183 | 145 | if (root->log_root) { |
4884b8e8 | 146 | if (btrfs_need_log_full_commit(trans)) { |
50471a38 MX |
147 | ret = -EAGAIN; |
148 | goto out; | |
149 | } | |
34eb2a52 | 150 | |
ff782e0a | 151 | if (!root->log_start_pid) { |
27cdeb70 | 152 | clear_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state); |
34eb2a52 | 153 | root->log_start_pid = current->pid; |
ff782e0a | 154 | } else if (root->log_start_pid != current->pid) { |
27cdeb70 | 155 | set_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state); |
ff782e0a | 156 | } |
34eb2a52 | 157 | } else { |
0b246afa JM |
158 | mutex_lock(&fs_info->tree_log_mutex); |
159 | if (!fs_info->log_root_tree) | |
160 | ret = btrfs_init_log_root_tree(trans, fs_info); | |
161 | mutex_unlock(&fs_info->tree_log_mutex); | |
34eb2a52 Z |
162 | if (ret) |
163 | goto out; | |
ff782e0a | 164 | |
e02119d5 | 165 | ret = btrfs_add_log_tree(trans, root); |
4a500fd1 | 166 | if (ret) |
e87ac136 | 167 | goto out; |
34eb2a52 | 168 | |
e7a79811 | 169 | set_bit(BTRFS_ROOT_HAS_LOG_TREE, &root->state); |
34eb2a52 Z |
170 | clear_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state); |
171 | root->log_start_pid = current->pid; | |
e02119d5 | 172 | } |
34eb2a52 | 173 | |
7237f183 | 174 | atomic_inc(&root->log_writers); |
75b463d2 | 175 | if (ctx && !ctx->logging_new_name) { |
34eb2a52 | 176 | int index = root->log_transid % 2; |
8b050d35 | 177 | list_add_tail(&ctx->list, &root->log_ctxs[index]); |
d1433deb | 178 | ctx->log_transid = root->log_transid; |
8b050d35 | 179 | } |
34eb2a52 | 180 | |
e87ac136 | 181 | out: |
7237f183 | 182 | mutex_unlock(&root->log_mutex); |
e87ac136 | 183 | return ret; |
e02119d5 CM |
184 | } |
185 | ||
186 | /* | |
187 | * returns 0 if there was a log transaction running and we were able | |
188 | * to join, or returns -ENOENT if there were not transactions | |
189 | * in progress | |
190 | */ | |
191 | static int join_running_log_trans(struct btrfs_root *root) | |
192 | { | |
193 | int ret = -ENOENT; | |
194 | ||
e7a79811 FM |
195 | if (!test_bit(BTRFS_ROOT_HAS_LOG_TREE, &root->state)) |
196 | return ret; | |
197 | ||
7237f183 | 198 | mutex_lock(&root->log_mutex); |
e02119d5 CM |
199 | if (root->log_root) { |
200 | ret = 0; | |
7237f183 | 201 | atomic_inc(&root->log_writers); |
e02119d5 | 202 | } |
7237f183 | 203 | mutex_unlock(&root->log_mutex); |
e02119d5 CM |
204 | return ret; |
205 | } | |
206 | ||
12fcfd22 CM |
207 | /* |
208 | * This either makes the current running log transaction wait | |
209 | * until you call btrfs_end_log_trans() or it makes any future | |
210 | * log transactions wait until you call btrfs_end_log_trans() | |
211 | */ | |
45128b08 | 212 | void btrfs_pin_log_trans(struct btrfs_root *root) |
12fcfd22 | 213 | { |
12fcfd22 | 214 | atomic_inc(&root->log_writers); |
12fcfd22 CM |
215 | } |
216 | ||
e02119d5 CM |
217 | /* |
218 | * indicate we're done making changes to the log tree | |
219 | * and wake up anyone waiting to do a sync | |
220 | */ | |
143bede5 | 221 | void btrfs_end_log_trans(struct btrfs_root *root) |
e02119d5 | 222 | { |
7237f183 | 223 | if (atomic_dec_and_test(&root->log_writers)) { |
093258e6 DS |
224 | /* atomic_dec_and_test implies a barrier */ |
225 | cond_wake_up_nomb(&root->log_writer_wait); | |
7237f183 | 226 | } |
e02119d5 CM |
227 | } |
228 | ||
247462a5 DS |
229 | static int btrfs_write_tree_block(struct extent_buffer *buf) |
230 | { | |
231 | return filemap_fdatawrite_range(buf->pages[0]->mapping, buf->start, | |
232 | buf->start + buf->len - 1); | |
233 | } | |
234 | ||
235 | static void btrfs_wait_tree_block_writeback(struct extent_buffer *buf) | |
236 | { | |
237 | filemap_fdatawait_range(buf->pages[0]->mapping, | |
238 | buf->start, buf->start + buf->len - 1); | |
239 | } | |
e02119d5 CM |
240 | |
241 | /* | |
242 | * the walk control struct is used to pass state down the chain when | |
243 | * processing the log tree. The stage field tells us which part | |
244 | * of the log tree processing we are currently doing. The others | |
245 | * are state fields used for that specific part | |
246 | */ | |
247 | struct walk_control { | |
248 | /* should we free the extent on disk when done? This is used | |
249 | * at transaction commit time while freeing a log tree | |
250 | */ | |
251 | int free; | |
252 | ||
253 | /* should we write out the extent buffer? This is used | |
254 | * while flushing the log tree to disk during a sync | |
255 | */ | |
256 | int write; | |
257 | ||
258 | /* should we wait for the extent buffer io to finish? Also used | |
259 | * while flushing the log tree to disk for a sync | |
260 | */ | |
261 | int wait; | |
262 | ||
263 | /* pin only walk, we record which extents on disk belong to the | |
264 | * log trees | |
265 | */ | |
266 | int pin; | |
267 | ||
268 | /* what stage of the replay code we're currently in */ | |
269 | int stage; | |
270 | ||
f2d72f42 FM |
271 | /* |
272 | * Ignore any items from the inode currently being processed. Needs | |
273 | * to be set every time we find a BTRFS_INODE_ITEM_KEY and we are in | |
274 | * the LOG_WALK_REPLAY_INODES stage. | |
275 | */ | |
276 | bool ignore_cur_inode; | |
277 | ||
e02119d5 CM |
278 | /* the root we are currently replaying */ |
279 | struct btrfs_root *replay_dest; | |
280 | ||
281 | /* the trans handle for the current replay */ | |
282 | struct btrfs_trans_handle *trans; | |
283 | ||
284 | /* the function that gets used to process blocks we find in the | |
285 | * tree. Note the extent_buffer might not be up to date when it is | |
286 | * passed in, and it must be checked or read if you need the data | |
287 | * inside it | |
288 | */ | |
289 | int (*process_func)(struct btrfs_root *log, struct extent_buffer *eb, | |
581c1760 | 290 | struct walk_control *wc, u64 gen, int level); |
e02119d5 CM |
291 | }; |
292 | ||
293 | /* | |
294 | * process_func used to pin down extents, write them or wait on them | |
295 | */ | |
296 | static int process_one_buffer(struct btrfs_root *log, | |
297 | struct extent_buffer *eb, | |
581c1760 | 298 | struct walk_control *wc, u64 gen, int level) |
e02119d5 | 299 | { |
0b246afa | 300 | struct btrfs_fs_info *fs_info = log->fs_info; |
b50c6e25 JB |
301 | int ret = 0; |
302 | ||
8c2a1a30 JB |
303 | /* |
304 | * If this fs is mixed then we need to be able to process the leaves to | |
305 | * pin down any logged extents, so we have to read the block. | |
306 | */ | |
0b246afa | 307 | if (btrfs_fs_incompat(fs_info, MIXED_GROUPS)) { |
581c1760 | 308 | ret = btrfs_read_buffer(eb, gen, level, NULL); |
8c2a1a30 JB |
309 | if (ret) |
310 | return ret; | |
311 | } | |
312 | ||
04018de5 | 313 | if (wc->pin) |
9fce5704 | 314 | ret = btrfs_pin_extent_for_log_replay(wc->trans, eb->start, |
2ff7e61e | 315 | eb->len); |
e02119d5 | 316 | |
b50c6e25 | 317 | if (!ret && btrfs_buffer_uptodate(eb, gen, 0)) { |
8c2a1a30 | 318 | if (wc->pin && btrfs_header_level(eb) == 0) |
bcdc428c | 319 | ret = btrfs_exclude_logged_extents(eb); |
e02119d5 CM |
320 | if (wc->write) |
321 | btrfs_write_tree_block(eb); | |
322 | if (wc->wait) | |
323 | btrfs_wait_tree_block_writeback(eb); | |
324 | } | |
b50c6e25 | 325 | return ret; |
e02119d5 CM |
326 | } |
327 | ||
328 | /* | |
329 | * Item overwrite used by replay and tree logging. eb, slot and key all refer | |
330 | * to the src data we are copying out. | |
331 | * | |
332 | * root is the tree we are copying into, and path is a scratch | |
333 | * path for use in this function (it should be released on entry and | |
334 | * will be released on exit). | |
335 | * | |
336 | * If the key is already in the destination tree the existing item is | |
337 | * overwritten. If the existing item isn't big enough, it is extended. | |
338 | * If it is too large, it is truncated. | |
339 | * | |
340 | * If the key isn't in the destination yet, a new item is inserted. | |
341 | */ | |
342 | static noinline int overwrite_item(struct btrfs_trans_handle *trans, | |
343 | struct btrfs_root *root, | |
344 | struct btrfs_path *path, | |
345 | struct extent_buffer *eb, int slot, | |
346 | struct btrfs_key *key) | |
347 | { | |
348 | int ret; | |
349 | u32 item_size; | |
350 | u64 saved_i_size = 0; | |
351 | int save_old_i_size = 0; | |
352 | unsigned long src_ptr; | |
353 | unsigned long dst_ptr; | |
354 | int overwrite_root = 0; | |
4bc4bee4 | 355 | bool inode_item = key->type == BTRFS_INODE_ITEM_KEY; |
e02119d5 CM |
356 | |
357 | if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) | |
358 | overwrite_root = 1; | |
359 | ||
360 | item_size = btrfs_item_size_nr(eb, slot); | |
361 | src_ptr = btrfs_item_ptr_offset(eb, slot); | |
362 | ||
363 | /* look for the key in the destination tree */ | |
364 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); | |
4bc4bee4 JB |
365 | if (ret < 0) |
366 | return ret; | |
367 | ||
e02119d5 CM |
368 | if (ret == 0) { |
369 | char *src_copy; | |
370 | char *dst_copy; | |
371 | u32 dst_size = btrfs_item_size_nr(path->nodes[0], | |
372 | path->slots[0]); | |
373 | if (dst_size != item_size) | |
374 | goto insert; | |
375 | ||
376 | if (item_size == 0) { | |
b3b4aa74 | 377 | btrfs_release_path(path); |
e02119d5 CM |
378 | return 0; |
379 | } | |
380 | dst_copy = kmalloc(item_size, GFP_NOFS); | |
381 | src_copy = kmalloc(item_size, GFP_NOFS); | |
2a29edc6 | 382 | if (!dst_copy || !src_copy) { |
b3b4aa74 | 383 | btrfs_release_path(path); |
2a29edc6 | 384 | kfree(dst_copy); |
385 | kfree(src_copy); | |
386 | return -ENOMEM; | |
387 | } | |
e02119d5 CM |
388 | |
389 | read_extent_buffer(eb, src_copy, src_ptr, item_size); | |
390 | ||
391 | dst_ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); | |
392 | read_extent_buffer(path->nodes[0], dst_copy, dst_ptr, | |
393 | item_size); | |
394 | ret = memcmp(dst_copy, src_copy, item_size); | |
395 | ||
396 | kfree(dst_copy); | |
397 | kfree(src_copy); | |
398 | /* | |
399 | * they have the same contents, just return, this saves | |
400 | * us from cowing blocks in the destination tree and doing | |
401 | * extra writes that may not have been done by a previous | |
402 | * sync | |
403 | */ | |
404 | if (ret == 0) { | |
b3b4aa74 | 405 | btrfs_release_path(path); |
e02119d5 CM |
406 | return 0; |
407 | } | |
408 | ||
4bc4bee4 JB |
409 | /* |
410 | * We need to load the old nbytes into the inode so when we | |
411 | * replay the extents we've logged we get the right nbytes. | |
412 | */ | |
413 | if (inode_item) { | |
414 | struct btrfs_inode_item *item; | |
415 | u64 nbytes; | |
d555438b | 416 | u32 mode; |
4bc4bee4 JB |
417 | |
418 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
419 | struct btrfs_inode_item); | |
420 | nbytes = btrfs_inode_nbytes(path->nodes[0], item); | |
421 | item = btrfs_item_ptr(eb, slot, | |
422 | struct btrfs_inode_item); | |
423 | btrfs_set_inode_nbytes(eb, item, nbytes); | |
d555438b JB |
424 | |
425 | /* | |
426 | * If this is a directory we need to reset the i_size to | |
427 | * 0 so that we can set it up properly when replaying | |
428 | * the rest of the items in this log. | |
429 | */ | |
430 | mode = btrfs_inode_mode(eb, item); | |
431 | if (S_ISDIR(mode)) | |
432 | btrfs_set_inode_size(eb, item, 0); | |
4bc4bee4 JB |
433 | } |
434 | } else if (inode_item) { | |
435 | struct btrfs_inode_item *item; | |
d555438b | 436 | u32 mode; |
4bc4bee4 JB |
437 | |
438 | /* | |
439 | * New inode, set nbytes to 0 so that the nbytes comes out | |
440 | * properly when we replay the extents. | |
441 | */ | |
442 | item = btrfs_item_ptr(eb, slot, struct btrfs_inode_item); | |
443 | btrfs_set_inode_nbytes(eb, item, 0); | |
d555438b JB |
444 | |
445 | /* | |
446 | * If this is a directory we need to reset the i_size to 0 so | |
447 | * that we can set it up properly when replaying the rest of | |
448 | * the items in this log. | |
449 | */ | |
450 | mode = btrfs_inode_mode(eb, item); | |
451 | if (S_ISDIR(mode)) | |
452 | btrfs_set_inode_size(eb, item, 0); | |
e02119d5 CM |
453 | } |
454 | insert: | |
b3b4aa74 | 455 | btrfs_release_path(path); |
e02119d5 | 456 | /* try to insert the key into the destination tree */ |
df8d116f | 457 | path->skip_release_on_error = 1; |
e02119d5 CM |
458 | ret = btrfs_insert_empty_item(trans, root, path, |
459 | key, item_size); | |
df8d116f | 460 | path->skip_release_on_error = 0; |
e02119d5 CM |
461 | |
462 | /* make sure any existing item is the correct size */ | |
df8d116f | 463 | if (ret == -EEXIST || ret == -EOVERFLOW) { |
e02119d5 CM |
464 | u32 found_size; |
465 | found_size = btrfs_item_size_nr(path->nodes[0], | |
466 | path->slots[0]); | |
143bede5 | 467 | if (found_size > item_size) |
78ac4f9e | 468 | btrfs_truncate_item(path, item_size, 1); |
143bede5 | 469 | else if (found_size < item_size) |
c71dd880 | 470 | btrfs_extend_item(path, item_size - found_size); |
e02119d5 | 471 | } else if (ret) { |
4a500fd1 | 472 | return ret; |
e02119d5 CM |
473 | } |
474 | dst_ptr = btrfs_item_ptr_offset(path->nodes[0], | |
475 | path->slots[0]); | |
476 | ||
477 | /* don't overwrite an existing inode if the generation number | |
478 | * was logged as zero. This is done when the tree logging code | |
479 | * is just logging an inode to make sure it exists after recovery. | |
480 | * | |
481 | * Also, don't overwrite i_size on directories during replay. | |
482 | * log replay inserts and removes directory items based on the | |
483 | * state of the tree found in the subvolume, and i_size is modified | |
484 | * as it goes | |
485 | */ | |
486 | if (key->type == BTRFS_INODE_ITEM_KEY && ret == -EEXIST) { | |
487 | struct btrfs_inode_item *src_item; | |
488 | struct btrfs_inode_item *dst_item; | |
489 | ||
490 | src_item = (struct btrfs_inode_item *)src_ptr; | |
491 | dst_item = (struct btrfs_inode_item *)dst_ptr; | |
492 | ||
1a4bcf47 FM |
493 | if (btrfs_inode_generation(eb, src_item) == 0) { |
494 | struct extent_buffer *dst_eb = path->nodes[0]; | |
2f2ff0ee | 495 | const u64 ino_size = btrfs_inode_size(eb, src_item); |
1a4bcf47 | 496 | |
2f2ff0ee FM |
497 | /* |
498 | * For regular files an ino_size == 0 is used only when | |
499 | * logging that an inode exists, as part of a directory | |
500 | * fsync, and the inode wasn't fsynced before. In this | |
501 | * case don't set the size of the inode in the fs/subvol | |
502 | * tree, otherwise we would be throwing valid data away. | |
503 | */ | |
1a4bcf47 | 504 | if (S_ISREG(btrfs_inode_mode(eb, src_item)) && |
2f2ff0ee | 505 | S_ISREG(btrfs_inode_mode(dst_eb, dst_item)) && |
60d48e2e DS |
506 | ino_size != 0) |
507 | btrfs_set_inode_size(dst_eb, dst_item, ino_size); | |
e02119d5 | 508 | goto no_copy; |
1a4bcf47 | 509 | } |
e02119d5 CM |
510 | |
511 | if (overwrite_root && | |
512 | S_ISDIR(btrfs_inode_mode(eb, src_item)) && | |
513 | S_ISDIR(btrfs_inode_mode(path->nodes[0], dst_item))) { | |
514 | save_old_i_size = 1; | |
515 | saved_i_size = btrfs_inode_size(path->nodes[0], | |
516 | dst_item); | |
517 | } | |
518 | } | |
519 | ||
520 | copy_extent_buffer(path->nodes[0], eb, dst_ptr, | |
521 | src_ptr, item_size); | |
522 | ||
523 | if (save_old_i_size) { | |
524 | struct btrfs_inode_item *dst_item; | |
525 | dst_item = (struct btrfs_inode_item *)dst_ptr; | |
526 | btrfs_set_inode_size(path->nodes[0], dst_item, saved_i_size); | |
527 | } | |
528 | ||
529 | /* make sure the generation is filled in */ | |
530 | if (key->type == BTRFS_INODE_ITEM_KEY) { | |
531 | struct btrfs_inode_item *dst_item; | |
532 | dst_item = (struct btrfs_inode_item *)dst_ptr; | |
533 | if (btrfs_inode_generation(path->nodes[0], dst_item) == 0) { | |
534 | btrfs_set_inode_generation(path->nodes[0], dst_item, | |
535 | trans->transid); | |
536 | } | |
537 | } | |
538 | no_copy: | |
539 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
b3b4aa74 | 540 | btrfs_release_path(path); |
e02119d5 CM |
541 | return 0; |
542 | } | |
543 | ||
544 | /* | |
545 | * simple helper to read an inode off the disk from a given root | |
546 | * This can only be called for subvolume roots and not for the log | |
547 | */ | |
548 | static noinline struct inode *read_one_inode(struct btrfs_root *root, | |
549 | u64 objectid) | |
550 | { | |
551 | struct inode *inode; | |
e02119d5 | 552 | |
0202e83f | 553 | inode = btrfs_iget(root->fs_info->sb, objectid, root); |
2e19f1f9 | 554 | if (IS_ERR(inode)) |
5d4f98a2 | 555 | inode = NULL; |
e02119d5 CM |
556 | return inode; |
557 | } | |
558 | ||
559 | /* replays a single extent in 'eb' at 'slot' with 'key' into the | |
560 | * subvolume 'root'. path is released on entry and should be released | |
561 | * on exit. | |
562 | * | |
563 | * extents in the log tree have not been allocated out of the extent | |
564 | * tree yet. So, this completes the allocation, taking a reference | |
565 | * as required if the extent already exists or creating a new extent | |
566 | * if it isn't in the extent allocation tree yet. | |
567 | * | |
568 | * The extent is inserted into the file, dropping any existing extents | |
569 | * from the file that overlap the new one. | |
570 | */ | |
571 | static noinline int replay_one_extent(struct btrfs_trans_handle *trans, | |
572 | struct btrfs_root *root, | |
573 | struct btrfs_path *path, | |
574 | struct extent_buffer *eb, int slot, | |
575 | struct btrfs_key *key) | |
576 | { | |
5893dfb9 | 577 | struct btrfs_drop_extents_args drop_args = { 0 }; |
0b246afa | 578 | struct btrfs_fs_info *fs_info = root->fs_info; |
e02119d5 | 579 | int found_type; |
e02119d5 | 580 | u64 extent_end; |
e02119d5 | 581 | u64 start = key->offset; |
4bc4bee4 | 582 | u64 nbytes = 0; |
e02119d5 CM |
583 | struct btrfs_file_extent_item *item; |
584 | struct inode *inode = NULL; | |
585 | unsigned long size; | |
586 | int ret = 0; | |
587 | ||
588 | item = btrfs_item_ptr(eb, slot, struct btrfs_file_extent_item); | |
589 | found_type = btrfs_file_extent_type(eb, item); | |
590 | ||
d899e052 | 591 | if (found_type == BTRFS_FILE_EXTENT_REG || |
4bc4bee4 JB |
592 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { |
593 | nbytes = btrfs_file_extent_num_bytes(eb, item); | |
594 | extent_end = start + nbytes; | |
595 | ||
596 | /* | |
597 | * We don't add to the inodes nbytes if we are prealloc or a | |
598 | * hole. | |
599 | */ | |
600 | if (btrfs_file_extent_disk_bytenr(eb, item) == 0) | |
601 | nbytes = 0; | |
602 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
e41ca589 | 603 | size = btrfs_file_extent_ram_bytes(eb, item); |
4bc4bee4 | 604 | nbytes = btrfs_file_extent_ram_bytes(eb, item); |
da17066c | 605 | extent_end = ALIGN(start + size, |
0b246afa | 606 | fs_info->sectorsize); |
e02119d5 CM |
607 | } else { |
608 | ret = 0; | |
609 | goto out; | |
610 | } | |
611 | ||
612 | inode = read_one_inode(root, key->objectid); | |
613 | if (!inode) { | |
614 | ret = -EIO; | |
615 | goto out; | |
616 | } | |
617 | ||
618 | /* | |
619 | * first check to see if we already have this extent in the | |
620 | * file. This must be done before the btrfs_drop_extents run | |
621 | * so we don't try to drop this extent. | |
622 | */ | |
f85b7379 DS |
623 | ret = btrfs_lookup_file_extent(trans, root, path, |
624 | btrfs_ino(BTRFS_I(inode)), start, 0); | |
e02119d5 | 625 | |
d899e052 YZ |
626 | if (ret == 0 && |
627 | (found_type == BTRFS_FILE_EXTENT_REG || | |
628 | found_type == BTRFS_FILE_EXTENT_PREALLOC)) { | |
e02119d5 CM |
629 | struct btrfs_file_extent_item cmp1; |
630 | struct btrfs_file_extent_item cmp2; | |
631 | struct btrfs_file_extent_item *existing; | |
632 | struct extent_buffer *leaf; | |
633 | ||
634 | leaf = path->nodes[0]; | |
635 | existing = btrfs_item_ptr(leaf, path->slots[0], | |
636 | struct btrfs_file_extent_item); | |
637 | ||
638 | read_extent_buffer(eb, &cmp1, (unsigned long)item, | |
639 | sizeof(cmp1)); | |
640 | read_extent_buffer(leaf, &cmp2, (unsigned long)existing, | |
641 | sizeof(cmp2)); | |
642 | ||
643 | /* | |
644 | * we already have a pointer to this exact extent, | |
645 | * we don't have to do anything | |
646 | */ | |
647 | if (memcmp(&cmp1, &cmp2, sizeof(cmp1)) == 0) { | |
b3b4aa74 | 648 | btrfs_release_path(path); |
e02119d5 CM |
649 | goto out; |
650 | } | |
651 | } | |
b3b4aa74 | 652 | btrfs_release_path(path); |
e02119d5 CM |
653 | |
654 | /* drop any overlapping extents */ | |
5893dfb9 FM |
655 | drop_args.start = start; |
656 | drop_args.end = extent_end; | |
657 | drop_args.drop_cache = true; | |
658 | ret = btrfs_drop_extents(trans, root, BTRFS_I(inode), &drop_args); | |
3650860b JB |
659 | if (ret) |
660 | goto out; | |
e02119d5 | 661 | |
07d400a6 YZ |
662 | if (found_type == BTRFS_FILE_EXTENT_REG || |
663 | found_type == BTRFS_FILE_EXTENT_PREALLOC) { | |
5d4f98a2 | 664 | u64 offset; |
07d400a6 YZ |
665 | unsigned long dest_offset; |
666 | struct btrfs_key ins; | |
667 | ||
3168021c FM |
668 | if (btrfs_file_extent_disk_bytenr(eb, item) == 0 && |
669 | btrfs_fs_incompat(fs_info, NO_HOLES)) | |
670 | goto update_inode; | |
671 | ||
07d400a6 YZ |
672 | ret = btrfs_insert_empty_item(trans, root, path, key, |
673 | sizeof(*item)); | |
3650860b JB |
674 | if (ret) |
675 | goto out; | |
07d400a6 YZ |
676 | dest_offset = btrfs_item_ptr_offset(path->nodes[0], |
677 | path->slots[0]); | |
678 | copy_extent_buffer(path->nodes[0], eb, dest_offset, | |
679 | (unsigned long)item, sizeof(*item)); | |
680 | ||
681 | ins.objectid = btrfs_file_extent_disk_bytenr(eb, item); | |
682 | ins.offset = btrfs_file_extent_disk_num_bytes(eb, item); | |
683 | ins.type = BTRFS_EXTENT_ITEM_KEY; | |
5d4f98a2 | 684 | offset = key->offset - btrfs_file_extent_offset(eb, item); |
07d400a6 | 685 | |
df2c95f3 QW |
686 | /* |
687 | * Manually record dirty extent, as here we did a shallow | |
688 | * file extent item copy and skip normal backref update, | |
689 | * but modifying extent tree all by ourselves. | |
690 | * So need to manually record dirty extent for qgroup, | |
691 | * as the owner of the file extent changed from log tree | |
692 | * (doesn't affect qgroup) to fs/file tree(affects qgroup) | |
693 | */ | |
a95f3aaf | 694 | ret = btrfs_qgroup_trace_extent(trans, |
df2c95f3 QW |
695 | btrfs_file_extent_disk_bytenr(eb, item), |
696 | btrfs_file_extent_disk_num_bytes(eb, item), | |
697 | GFP_NOFS); | |
698 | if (ret < 0) | |
699 | goto out; | |
700 | ||
07d400a6 | 701 | if (ins.objectid > 0) { |
82fa113f | 702 | struct btrfs_ref ref = { 0 }; |
07d400a6 YZ |
703 | u64 csum_start; |
704 | u64 csum_end; | |
705 | LIST_HEAD(ordered_sums); | |
82fa113f | 706 | |
07d400a6 YZ |
707 | /* |
708 | * is this extent already allocated in the extent | |
709 | * allocation tree? If so, just add a reference | |
710 | */ | |
2ff7e61e | 711 | ret = btrfs_lookup_data_extent(fs_info, ins.objectid, |
07d400a6 YZ |
712 | ins.offset); |
713 | if (ret == 0) { | |
82fa113f QW |
714 | btrfs_init_generic_ref(&ref, |
715 | BTRFS_ADD_DELAYED_REF, | |
716 | ins.objectid, ins.offset, 0); | |
717 | btrfs_init_data_ref(&ref, | |
718 | root->root_key.objectid, | |
b06c4bf5 | 719 | key->objectid, offset); |
82fa113f | 720 | ret = btrfs_inc_extent_ref(trans, &ref); |
b50c6e25 JB |
721 | if (ret) |
722 | goto out; | |
07d400a6 YZ |
723 | } else { |
724 | /* | |
725 | * insert the extent pointer in the extent | |
726 | * allocation tree | |
727 | */ | |
5d4f98a2 | 728 | ret = btrfs_alloc_logged_file_extent(trans, |
2ff7e61e | 729 | root->root_key.objectid, |
5d4f98a2 | 730 | key->objectid, offset, &ins); |
b50c6e25 JB |
731 | if (ret) |
732 | goto out; | |
07d400a6 | 733 | } |
b3b4aa74 | 734 | btrfs_release_path(path); |
07d400a6 YZ |
735 | |
736 | if (btrfs_file_extent_compression(eb, item)) { | |
737 | csum_start = ins.objectid; | |
738 | csum_end = csum_start + ins.offset; | |
739 | } else { | |
740 | csum_start = ins.objectid + | |
741 | btrfs_file_extent_offset(eb, item); | |
742 | csum_end = csum_start + | |
743 | btrfs_file_extent_num_bytes(eb, item); | |
744 | } | |
745 | ||
746 | ret = btrfs_lookup_csums_range(root->log_root, | |
747 | csum_start, csum_end - 1, | |
a2de733c | 748 | &ordered_sums, 0); |
3650860b JB |
749 | if (ret) |
750 | goto out; | |
b84b8390 FM |
751 | /* |
752 | * Now delete all existing cums in the csum root that | |
753 | * cover our range. We do this because we can have an | |
754 | * extent that is completely referenced by one file | |
755 | * extent item and partially referenced by another | |
756 | * file extent item (like after using the clone or | |
757 | * extent_same ioctls). In this case if we end up doing | |
758 | * the replay of the one that partially references the | |
759 | * extent first, and we do not do the csum deletion | |
760 | * below, we can get 2 csum items in the csum tree that | |
761 | * overlap each other. For example, imagine our log has | |
762 | * the two following file extent items: | |
763 | * | |
764 | * key (257 EXTENT_DATA 409600) | |
765 | * extent data disk byte 12845056 nr 102400 | |
766 | * extent data offset 20480 nr 20480 ram 102400 | |
767 | * | |
768 | * key (257 EXTENT_DATA 819200) | |
769 | * extent data disk byte 12845056 nr 102400 | |
770 | * extent data offset 0 nr 102400 ram 102400 | |
771 | * | |
772 | * Where the second one fully references the 100K extent | |
773 | * that starts at disk byte 12845056, and the log tree | |
774 | * has a single csum item that covers the entire range | |
775 | * of the extent: | |
776 | * | |
777 | * key (EXTENT_CSUM EXTENT_CSUM 12845056) itemsize 100 | |
778 | * | |
779 | * After the first file extent item is replayed, the | |
780 | * csum tree gets the following csum item: | |
781 | * | |
782 | * key (EXTENT_CSUM EXTENT_CSUM 12865536) itemsize 20 | |
783 | * | |
784 | * Which covers the 20K sub-range starting at offset 20K | |
785 | * of our extent. Now when we replay the second file | |
786 | * extent item, if we do not delete existing csum items | |
787 | * that cover any of its blocks, we end up getting two | |
788 | * csum items in our csum tree that overlap each other: | |
789 | * | |
790 | * key (EXTENT_CSUM EXTENT_CSUM 12845056) itemsize 100 | |
791 | * key (EXTENT_CSUM EXTENT_CSUM 12865536) itemsize 20 | |
792 | * | |
793 | * Which is a problem, because after this anyone trying | |
794 | * to lookup up for the checksum of any block of our | |
795 | * extent starting at an offset of 40K or higher, will | |
796 | * end up looking at the second csum item only, which | |
797 | * does not contain the checksum for any block starting | |
798 | * at offset 40K or higher of our extent. | |
799 | */ | |
07d400a6 YZ |
800 | while (!list_empty(&ordered_sums)) { |
801 | struct btrfs_ordered_sum *sums; | |
802 | sums = list_entry(ordered_sums.next, | |
803 | struct btrfs_ordered_sum, | |
804 | list); | |
b84b8390 | 805 | if (!ret) |
40e046ac FM |
806 | ret = btrfs_del_csums(trans, |
807 | fs_info->csum_root, | |
5b4aacef JM |
808 | sums->bytenr, |
809 | sums->len); | |
3650860b JB |
810 | if (!ret) |
811 | ret = btrfs_csum_file_blocks(trans, | |
0b246afa | 812 | fs_info->csum_root, sums); |
07d400a6 YZ |
813 | list_del(&sums->list); |
814 | kfree(sums); | |
815 | } | |
3650860b JB |
816 | if (ret) |
817 | goto out; | |
07d400a6 | 818 | } else { |
b3b4aa74 | 819 | btrfs_release_path(path); |
07d400a6 YZ |
820 | } |
821 | } else if (found_type == BTRFS_FILE_EXTENT_INLINE) { | |
822 | /* inline extents are easy, we just overwrite them */ | |
823 | ret = overwrite_item(trans, root, path, eb, slot, key); | |
3650860b JB |
824 | if (ret) |
825 | goto out; | |
07d400a6 | 826 | } |
e02119d5 | 827 | |
9ddc959e JB |
828 | ret = btrfs_inode_set_file_extent_range(BTRFS_I(inode), start, |
829 | extent_end - start); | |
830 | if (ret) | |
831 | goto out; | |
832 | ||
3168021c | 833 | update_inode: |
2766ff61 | 834 | btrfs_update_inode_bytes(BTRFS_I(inode), nbytes, drop_args.bytes_found); |
9a56fcd1 | 835 | ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); |
e02119d5 CM |
836 | out: |
837 | if (inode) | |
838 | iput(inode); | |
839 | return ret; | |
840 | } | |
841 | ||
842 | /* | |
843 | * when cleaning up conflicts between the directory names in the | |
844 | * subvolume, directory names in the log and directory names in the | |
845 | * inode back references, we may have to unlink inodes from directories. | |
846 | * | |
847 | * This is a helper function to do the unlink of a specific directory | |
848 | * item | |
849 | */ | |
850 | static noinline int drop_one_dir_item(struct btrfs_trans_handle *trans, | |
851 | struct btrfs_root *root, | |
852 | struct btrfs_path *path, | |
207e7d92 | 853 | struct btrfs_inode *dir, |
e02119d5 CM |
854 | struct btrfs_dir_item *di) |
855 | { | |
856 | struct inode *inode; | |
857 | char *name; | |
858 | int name_len; | |
859 | struct extent_buffer *leaf; | |
860 | struct btrfs_key location; | |
861 | int ret; | |
862 | ||
863 | leaf = path->nodes[0]; | |
864 | ||
865 | btrfs_dir_item_key_to_cpu(leaf, di, &location); | |
866 | name_len = btrfs_dir_name_len(leaf, di); | |
867 | name = kmalloc(name_len, GFP_NOFS); | |
2a29edc6 | 868 | if (!name) |
869 | return -ENOMEM; | |
870 | ||
e02119d5 | 871 | read_extent_buffer(leaf, name, (unsigned long)(di + 1), name_len); |
b3b4aa74 | 872 | btrfs_release_path(path); |
e02119d5 CM |
873 | |
874 | inode = read_one_inode(root, location.objectid); | |
c00e9493 | 875 | if (!inode) { |
3650860b JB |
876 | ret = -EIO; |
877 | goto out; | |
c00e9493 | 878 | } |
e02119d5 | 879 | |
ec051c0f | 880 | ret = link_to_fixup_dir(trans, root, path, location.objectid); |
3650860b JB |
881 | if (ret) |
882 | goto out; | |
12fcfd22 | 883 | |
207e7d92 NB |
884 | ret = btrfs_unlink_inode(trans, root, dir, BTRFS_I(inode), name, |
885 | name_len); | |
3650860b JB |
886 | if (ret) |
887 | goto out; | |
ada9af21 | 888 | else |
e5c304e6 | 889 | ret = btrfs_run_delayed_items(trans); |
3650860b | 890 | out: |
e02119d5 | 891 | kfree(name); |
e02119d5 CM |
892 | iput(inode); |
893 | return ret; | |
894 | } | |
895 | ||
896 | /* | |
897 | * helper function to see if a given name and sequence number found | |
898 | * in an inode back reference are already in a directory and correctly | |
899 | * point to this inode | |
900 | */ | |
901 | static noinline int inode_in_dir(struct btrfs_root *root, | |
902 | struct btrfs_path *path, | |
903 | u64 dirid, u64 objectid, u64 index, | |
904 | const char *name, int name_len) | |
905 | { | |
906 | struct btrfs_dir_item *di; | |
907 | struct btrfs_key location; | |
908 | int match = 0; | |
909 | ||
910 | di = btrfs_lookup_dir_index_item(NULL, root, path, dirid, | |
911 | index, name, name_len, 0); | |
912 | if (di && !IS_ERR(di)) { | |
913 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
914 | if (location.objectid != objectid) | |
915 | goto out; | |
916 | } else | |
917 | goto out; | |
b3b4aa74 | 918 | btrfs_release_path(path); |
e02119d5 CM |
919 | |
920 | di = btrfs_lookup_dir_item(NULL, root, path, dirid, name, name_len, 0); | |
921 | if (di && !IS_ERR(di)) { | |
922 | btrfs_dir_item_key_to_cpu(path->nodes[0], di, &location); | |
923 | if (location.objectid != objectid) | |
924 | goto out; | |
925 | } else | |
926 | goto out; | |
927 | match = 1; | |
928 | out: | |
b3b4aa74 | 929 | btrfs_release_path(path); |
e02119d5 CM |
930 | return match; |
931 | } | |
932 | ||
933 | /* | |
934 | * helper function to check a log tree for a named back reference in | |
935 | * an inode. This is used to decide if a back reference that is | |
936 | * found in the subvolume conflicts with what we find in the log. | |
937 | * | |
938 | * inode backreferences may have multiple refs in a single item, | |
939 | * during replay we process one reference at a time, and we don't | |
940 | * want to delete valid links to a file from the subvolume if that | |
941 | * link is also in the log. | |
942 | */ | |
943 | static noinline int backref_in_log(struct btrfs_root *log, | |
944 | struct btrfs_key *key, | |
f186373f | 945 | u64 ref_objectid, |
df8d116f | 946 | const char *name, int namelen) |
e02119d5 CM |
947 | { |
948 | struct btrfs_path *path; | |
e02119d5 | 949 | int ret; |
e02119d5 CM |
950 | |
951 | path = btrfs_alloc_path(); | |
2a29edc6 | 952 | if (!path) |
953 | return -ENOMEM; | |
954 | ||
e02119d5 | 955 | ret = btrfs_search_slot(NULL, log, key, path, 0, 0); |
d3316c82 NB |
956 | if (ret < 0) { |
957 | goto out; | |
958 | } else if (ret == 1) { | |
89cbf5f6 | 959 | ret = 0; |
f186373f MF |
960 | goto out; |
961 | } | |
962 | ||
89cbf5f6 NB |
963 | if (key->type == BTRFS_INODE_EXTREF_KEY) |
964 | ret = !!btrfs_find_name_in_ext_backref(path->nodes[0], | |
965 | path->slots[0], | |
966 | ref_objectid, | |
967 | name, namelen); | |
968 | else | |
969 | ret = !!btrfs_find_name_in_backref(path->nodes[0], | |
970 | path->slots[0], | |
971 | name, namelen); | |
e02119d5 CM |
972 | out: |
973 | btrfs_free_path(path); | |
89cbf5f6 | 974 | return ret; |
e02119d5 CM |
975 | } |
976 | ||
5a1d7843 | 977 | static inline int __add_inode_ref(struct btrfs_trans_handle *trans, |
e02119d5 | 978 | struct btrfs_root *root, |
e02119d5 | 979 | struct btrfs_path *path, |
5a1d7843 | 980 | struct btrfs_root *log_root, |
94c91a1f NB |
981 | struct btrfs_inode *dir, |
982 | struct btrfs_inode *inode, | |
f186373f MF |
983 | u64 inode_objectid, u64 parent_objectid, |
984 | u64 ref_index, char *name, int namelen, | |
985 | int *search_done) | |
e02119d5 | 986 | { |
34f3e4f2 | 987 | int ret; |
f186373f MF |
988 | char *victim_name; |
989 | int victim_name_len; | |
990 | struct extent_buffer *leaf; | |
5a1d7843 | 991 | struct btrfs_dir_item *di; |
f186373f MF |
992 | struct btrfs_key search_key; |
993 | struct btrfs_inode_extref *extref; | |
c622ae60 | 994 | |
f186373f MF |
995 | again: |
996 | /* Search old style refs */ | |
997 | search_key.objectid = inode_objectid; | |
998 | search_key.type = BTRFS_INODE_REF_KEY; | |
999 | search_key.offset = parent_objectid; | |
1000 | ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0); | |
e02119d5 | 1001 | if (ret == 0) { |
e02119d5 CM |
1002 | struct btrfs_inode_ref *victim_ref; |
1003 | unsigned long ptr; | |
1004 | unsigned long ptr_end; | |
f186373f MF |
1005 | |
1006 | leaf = path->nodes[0]; | |
e02119d5 CM |
1007 | |
1008 | /* are we trying to overwrite a back ref for the root directory | |
1009 | * if so, just jump out, we're done | |
1010 | */ | |
f186373f | 1011 | if (search_key.objectid == search_key.offset) |
5a1d7843 | 1012 | return 1; |
e02119d5 CM |
1013 | |
1014 | /* check all the names in this back reference to see | |
1015 | * if they are in the log. if so, we allow them to stay | |
1016 | * otherwise they must be unlinked as a conflict | |
1017 | */ | |
1018 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
1019 | ptr_end = ptr + btrfs_item_size_nr(leaf, path->slots[0]); | |
d397712b | 1020 | while (ptr < ptr_end) { |
e02119d5 CM |
1021 | victim_ref = (struct btrfs_inode_ref *)ptr; |
1022 | victim_name_len = btrfs_inode_ref_name_len(leaf, | |
1023 | victim_ref); | |
1024 | victim_name = kmalloc(victim_name_len, GFP_NOFS); | |
3650860b JB |
1025 | if (!victim_name) |
1026 | return -ENOMEM; | |
e02119d5 CM |
1027 | |
1028 | read_extent_buffer(leaf, victim_name, | |
1029 | (unsigned long)(victim_ref + 1), | |
1030 | victim_name_len); | |
1031 | ||
d3316c82 NB |
1032 | ret = backref_in_log(log_root, &search_key, |
1033 | parent_objectid, victim_name, | |
1034 | victim_name_len); | |
1035 | if (ret < 0) { | |
1036 | kfree(victim_name); | |
1037 | return ret; | |
1038 | } else if (!ret) { | |
94c91a1f | 1039 | inc_nlink(&inode->vfs_inode); |
b3b4aa74 | 1040 | btrfs_release_path(path); |
12fcfd22 | 1041 | |
94c91a1f | 1042 | ret = btrfs_unlink_inode(trans, root, dir, inode, |
4ec5934e | 1043 | victim_name, victim_name_len); |
f186373f | 1044 | kfree(victim_name); |
3650860b JB |
1045 | if (ret) |
1046 | return ret; | |
e5c304e6 | 1047 | ret = btrfs_run_delayed_items(trans); |
ada9af21 FDBM |
1048 | if (ret) |
1049 | return ret; | |
f186373f MF |
1050 | *search_done = 1; |
1051 | goto again; | |
e02119d5 CM |
1052 | } |
1053 | kfree(victim_name); | |
f186373f | 1054 | |
e02119d5 CM |
1055 | ptr = (unsigned long)(victim_ref + 1) + victim_name_len; |
1056 | } | |
e02119d5 | 1057 | |
c622ae60 | 1058 | /* |
1059 | * NOTE: we have searched root tree and checked the | |
bb7ab3b9 | 1060 | * corresponding ref, it does not need to check again. |
c622ae60 | 1061 | */ |
5a1d7843 | 1062 | *search_done = 1; |
e02119d5 | 1063 | } |
b3b4aa74 | 1064 | btrfs_release_path(path); |
e02119d5 | 1065 | |
f186373f MF |
1066 | /* Same search but for extended refs */ |
1067 | extref = btrfs_lookup_inode_extref(NULL, root, path, name, namelen, | |
1068 | inode_objectid, parent_objectid, 0, | |
1069 | 0); | |
1070 | if (!IS_ERR_OR_NULL(extref)) { | |
1071 | u32 item_size; | |
1072 | u32 cur_offset = 0; | |
1073 | unsigned long base; | |
1074 | struct inode *victim_parent; | |
1075 | ||
1076 | leaf = path->nodes[0]; | |
1077 | ||
1078 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1079 | base = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
1080 | ||
1081 | while (cur_offset < item_size) { | |
dd9ef135 | 1082 | extref = (struct btrfs_inode_extref *)(base + cur_offset); |
f186373f MF |
1083 | |
1084 | victim_name_len = btrfs_inode_extref_name_len(leaf, extref); | |
1085 | ||
1086 | if (btrfs_inode_extref_parent(leaf, extref) != parent_objectid) | |
1087 | goto next; | |
1088 | ||
1089 | victim_name = kmalloc(victim_name_len, GFP_NOFS); | |
3650860b JB |
1090 | if (!victim_name) |
1091 | return -ENOMEM; | |
f186373f MF |
1092 | read_extent_buffer(leaf, victim_name, (unsigned long)&extref->name, |
1093 | victim_name_len); | |
1094 | ||
1095 | search_key.objectid = inode_objectid; | |
1096 | search_key.type = BTRFS_INODE_EXTREF_KEY; | |
1097 | search_key.offset = btrfs_extref_hash(parent_objectid, | |
1098 | victim_name, | |
1099 | victim_name_len); | |
d3316c82 NB |
1100 | ret = backref_in_log(log_root, &search_key, |
1101 | parent_objectid, victim_name, | |
1102 | victim_name_len); | |
1103 | if (ret < 0) { | |
1104 | return ret; | |
1105 | } else if (!ret) { | |
f186373f MF |
1106 | ret = -ENOENT; |
1107 | victim_parent = read_one_inode(root, | |
94c91a1f | 1108 | parent_objectid); |
f186373f | 1109 | if (victim_parent) { |
94c91a1f | 1110 | inc_nlink(&inode->vfs_inode); |
f186373f MF |
1111 | btrfs_release_path(path); |
1112 | ||
1113 | ret = btrfs_unlink_inode(trans, root, | |
4ec5934e | 1114 | BTRFS_I(victim_parent), |
94c91a1f | 1115 | inode, |
4ec5934e NB |
1116 | victim_name, |
1117 | victim_name_len); | |
ada9af21 FDBM |
1118 | if (!ret) |
1119 | ret = btrfs_run_delayed_items( | |
e5c304e6 | 1120 | trans); |
f186373f | 1121 | } |
f186373f MF |
1122 | iput(victim_parent); |
1123 | kfree(victim_name); | |
3650860b JB |
1124 | if (ret) |
1125 | return ret; | |
f186373f MF |
1126 | *search_done = 1; |
1127 | goto again; | |
1128 | } | |
1129 | kfree(victim_name); | |
f186373f MF |
1130 | next: |
1131 | cur_offset += victim_name_len + sizeof(*extref); | |
1132 | } | |
1133 | *search_done = 1; | |
1134 | } | |
1135 | btrfs_release_path(path); | |
1136 | ||
34f3e4f2 | 1137 | /* look for a conflicting sequence number */ |
94c91a1f | 1138 | di = btrfs_lookup_dir_index_item(trans, root, path, btrfs_ino(dir), |
f186373f | 1139 | ref_index, name, namelen, 0); |
34f3e4f2 | 1140 | if (di && !IS_ERR(di)) { |
94c91a1f | 1141 | ret = drop_one_dir_item(trans, root, path, dir, di); |
3650860b JB |
1142 | if (ret) |
1143 | return ret; | |
34f3e4f2 | 1144 | } |
1145 | btrfs_release_path(path); | |
1146 | ||
52042d8e | 1147 | /* look for a conflicting name */ |
94c91a1f | 1148 | di = btrfs_lookup_dir_item(trans, root, path, btrfs_ino(dir), |
34f3e4f2 | 1149 | name, namelen, 0); |
1150 | if (di && !IS_ERR(di)) { | |
94c91a1f | 1151 | ret = drop_one_dir_item(trans, root, path, dir, di); |
3650860b JB |
1152 | if (ret) |
1153 | return ret; | |
34f3e4f2 | 1154 | } |
1155 | btrfs_release_path(path); | |
1156 | ||
5a1d7843 JS |
1157 | return 0; |
1158 | } | |
e02119d5 | 1159 | |
bae15d95 QW |
1160 | static int extref_get_fields(struct extent_buffer *eb, unsigned long ref_ptr, |
1161 | u32 *namelen, char **name, u64 *index, | |
1162 | u64 *parent_objectid) | |
f186373f MF |
1163 | { |
1164 | struct btrfs_inode_extref *extref; | |
1165 | ||
1166 | extref = (struct btrfs_inode_extref *)ref_ptr; | |
1167 | ||
1168 | *namelen = btrfs_inode_extref_name_len(eb, extref); | |
1169 | *name = kmalloc(*namelen, GFP_NOFS); | |
1170 | if (*name == NULL) | |
1171 | return -ENOMEM; | |
1172 | ||
1173 | read_extent_buffer(eb, *name, (unsigned long)&extref->name, | |
1174 | *namelen); | |
1175 | ||
1f250e92 FM |
1176 | if (index) |
1177 | *index = btrfs_inode_extref_index(eb, extref); | |
f186373f MF |
1178 | if (parent_objectid) |
1179 | *parent_objectid = btrfs_inode_extref_parent(eb, extref); | |
1180 | ||
1181 | return 0; | |
1182 | } | |
1183 | ||
bae15d95 QW |
1184 | static int ref_get_fields(struct extent_buffer *eb, unsigned long ref_ptr, |
1185 | u32 *namelen, char **name, u64 *index) | |
f186373f MF |
1186 | { |
1187 | struct btrfs_inode_ref *ref; | |
1188 | ||
1189 | ref = (struct btrfs_inode_ref *)ref_ptr; | |
1190 | ||
1191 | *namelen = btrfs_inode_ref_name_len(eb, ref); | |
1192 | *name = kmalloc(*namelen, GFP_NOFS); | |
1193 | if (*name == NULL) | |
1194 | return -ENOMEM; | |
1195 | ||
1196 | read_extent_buffer(eb, *name, (unsigned long)(ref + 1), *namelen); | |
1197 | ||
1f250e92 FM |
1198 | if (index) |
1199 | *index = btrfs_inode_ref_index(eb, ref); | |
f186373f MF |
1200 | |
1201 | return 0; | |
1202 | } | |
1203 | ||
1f250e92 FM |
1204 | /* |
1205 | * Take an inode reference item from the log tree and iterate all names from the | |
1206 | * inode reference item in the subvolume tree with the same key (if it exists). | |
1207 | * For any name that is not in the inode reference item from the log tree, do a | |
1208 | * proper unlink of that name (that is, remove its entry from the inode | |
1209 | * reference item and both dir index keys). | |
1210 | */ | |
1211 | static int unlink_old_inode_refs(struct btrfs_trans_handle *trans, | |
1212 | struct btrfs_root *root, | |
1213 | struct btrfs_path *path, | |
1214 | struct btrfs_inode *inode, | |
1215 | struct extent_buffer *log_eb, | |
1216 | int log_slot, | |
1217 | struct btrfs_key *key) | |
1218 | { | |
1219 | int ret; | |
1220 | unsigned long ref_ptr; | |
1221 | unsigned long ref_end; | |
1222 | struct extent_buffer *eb; | |
1223 | ||
1224 | again: | |
1225 | btrfs_release_path(path); | |
1226 | ret = btrfs_search_slot(NULL, root, key, path, 0, 0); | |
1227 | if (ret > 0) { | |
1228 | ret = 0; | |
1229 | goto out; | |
1230 | } | |
1231 | if (ret < 0) | |
1232 | goto out; | |
1233 | ||
1234 | eb = path->nodes[0]; | |
1235 | ref_ptr = btrfs_item_ptr_offset(eb, path->slots[0]); | |
1236 | ref_end = ref_ptr + btrfs_item_size_nr(eb, path->slots[0]); | |
1237 | while (ref_ptr < ref_end) { | |
1238 | char *name = NULL; | |
1239 | int namelen; | |
1240 | u64 parent_id; | |
1241 | ||
1242 | if (key->type == BTRFS_INODE_EXTREF_KEY) { | |
1243 | ret = extref_get_fields(eb, ref_ptr, &namelen, &name, | |
1244 | NULL, &parent_id); | |
1245 | } else { | |
1246 | parent_id = key->offset; | |
1247 | ret = ref_get_fields(eb, ref_ptr, &namelen, &name, | |
1248 | NULL); | |
1249 | } | |
1250 | if (ret) | |
1251 | goto out; | |
1252 | ||
1253 | if (key->type == BTRFS_INODE_EXTREF_KEY) | |
6ff49c6a NB |
1254 | ret = !!btrfs_find_name_in_ext_backref(log_eb, log_slot, |
1255 | parent_id, name, | |
1256 | namelen); | |
1f250e92 | 1257 | else |
9bb8407f NB |
1258 | ret = !!btrfs_find_name_in_backref(log_eb, log_slot, |
1259 | name, namelen); | |
1f250e92 FM |
1260 | |
1261 | if (!ret) { | |
1262 | struct inode *dir; | |
1263 | ||
1264 | btrfs_release_path(path); | |
1265 | dir = read_one_inode(root, parent_id); | |
1266 | if (!dir) { | |
1267 | ret = -ENOENT; | |
1268 | kfree(name); | |
1269 | goto out; | |
1270 | } | |
1271 | ret = btrfs_unlink_inode(trans, root, BTRFS_I(dir), | |
1272 | inode, name, namelen); | |
1273 | kfree(name); | |
1274 | iput(dir); | |
1275 | if (ret) | |
1276 | goto out; | |
1277 | goto again; | |
1278 | } | |
1279 | ||
1280 | kfree(name); | |
1281 | ref_ptr += namelen; | |
1282 | if (key->type == BTRFS_INODE_EXTREF_KEY) | |
1283 | ref_ptr += sizeof(struct btrfs_inode_extref); | |
1284 | else | |
1285 | ref_ptr += sizeof(struct btrfs_inode_ref); | |
1286 | } | |
1287 | ret = 0; | |
1288 | out: | |
1289 | btrfs_release_path(path); | |
1290 | return ret; | |
1291 | } | |
1292 | ||
0d836392 FM |
1293 | static int btrfs_inode_ref_exists(struct inode *inode, struct inode *dir, |
1294 | const u8 ref_type, const char *name, | |
1295 | const int namelen) | |
1296 | { | |
1297 | struct btrfs_key key; | |
1298 | struct btrfs_path *path; | |
1299 | const u64 parent_id = btrfs_ino(BTRFS_I(dir)); | |
1300 | int ret; | |
1301 | ||
1302 | path = btrfs_alloc_path(); | |
1303 | if (!path) | |
1304 | return -ENOMEM; | |
1305 | ||
1306 | key.objectid = btrfs_ino(BTRFS_I(inode)); | |
1307 | key.type = ref_type; | |
1308 | if (key.type == BTRFS_INODE_REF_KEY) | |
1309 | key.offset = parent_id; | |
1310 | else | |
1311 | key.offset = btrfs_extref_hash(parent_id, name, namelen); | |
1312 | ||
1313 | ret = btrfs_search_slot(NULL, BTRFS_I(inode)->root, &key, path, 0, 0); | |
1314 | if (ret < 0) | |
1315 | goto out; | |
1316 | if (ret > 0) { | |
1317 | ret = 0; | |
1318 | goto out; | |
1319 | } | |
1320 | if (key.type == BTRFS_INODE_EXTREF_KEY) | |
6ff49c6a NB |
1321 | ret = !!btrfs_find_name_in_ext_backref(path->nodes[0], |
1322 | path->slots[0], parent_id, name, namelen); | |
0d836392 | 1323 | else |
9bb8407f NB |
1324 | ret = !!btrfs_find_name_in_backref(path->nodes[0], path->slots[0], |
1325 | name, namelen); | |
0d836392 FM |
1326 | |
1327 | out: | |
1328 | btrfs_free_path(path); | |
1329 | return ret; | |
1330 | } | |
1331 | ||
6b5fc433 FM |
1332 | static int add_link(struct btrfs_trans_handle *trans, struct btrfs_root *root, |
1333 | struct inode *dir, struct inode *inode, const char *name, | |
1334 | int namelen, u64 ref_index) | |
1335 | { | |
1336 | struct btrfs_dir_item *dir_item; | |
1337 | struct btrfs_key key; | |
1338 | struct btrfs_path *path; | |
1339 | struct inode *other_inode = NULL; | |
1340 | int ret; | |
1341 | ||
1342 | path = btrfs_alloc_path(); | |
1343 | if (!path) | |
1344 | return -ENOMEM; | |
1345 | ||
1346 | dir_item = btrfs_lookup_dir_item(NULL, root, path, | |
1347 | btrfs_ino(BTRFS_I(dir)), | |
1348 | name, namelen, 0); | |
1349 | if (!dir_item) { | |
1350 | btrfs_release_path(path); | |
1351 | goto add_link; | |
1352 | } else if (IS_ERR(dir_item)) { | |
1353 | ret = PTR_ERR(dir_item); | |
1354 | goto out; | |
1355 | } | |
1356 | ||
1357 | /* | |
1358 | * Our inode's dentry collides with the dentry of another inode which is | |
1359 | * in the log but not yet processed since it has a higher inode number. | |
1360 | * So delete that other dentry. | |
1361 | */ | |
1362 | btrfs_dir_item_key_to_cpu(path->nodes[0], dir_item, &key); | |
1363 | btrfs_release_path(path); | |
1364 | other_inode = read_one_inode(root, key.objectid); | |
1365 | if (!other_inode) { | |
1366 | ret = -ENOENT; | |
1367 | goto out; | |
1368 | } | |
1369 | ret = btrfs_unlink_inode(trans, root, BTRFS_I(dir), BTRFS_I(other_inode), | |
1370 | name, namelen); | |
1371 | if (ret) | |
1372 | goto out; | |
1373 | /* | |
1374 | * If we dropped the link count to 0, bump it so that later the iput() | |
1375 | * on the inode will not free it. We will fixup the link count later. | |
1376 | */ | |
1377 | if (other_inode->i_nlink == 0) | |
1378 | inc_nlink(other_inode); | |
1379 | ||
1380 | ret = btrfs_run_delayed_items(trans); | |
1381 | if (ret) | |
1382 | goto out; | |
1383 | add_link: | |
1384 | ret = btrfs_add_link(trans, BTRFS_I(dir), BTRFS_I(inode), | |
1385 | name, namelen, 0, ref_index); | |
1386 | out: | |
1387 | iput(other_inode); | |
1388 | btrfs_free_path(path); | |
1389 | ||
1390 | return ret; | |
1391 | } | |
1392 | ||
5a1d7843 JS |
1393 | /* |
1394 | * replay one inode back reference item found in the log tree. | |
1395 | * eb, slot and key refer to the buffer and key found in the log tree. | |
1396 | * root is the destination we are replaying into, and path is for temp | |
1397 | * use by this function. (it should be released on return). | |
1398 | */ | |
1399 | static noinline int add_inode_ref(struct btrfs_trans_handle *trans, | |
1400 | struct btrfs_root *root, | |
1401 | struct btrfs_root *log, | |
1402 | struct btrfs_path *path, | |
1403 | struct extent_buffer *eb, int slot, | |
1404 | struct btrfs_key *key) | |
1405 | { | |
03b2f08b GB |
1406 | struct inode *dir = NULL; |
1407 | struct inode *inode = NULL; | |
5a1d7843 JS |
1408 | unsigned long ref_ptr; |
1409 | unsigned long ref_end; | |
03b2f08b | 1410 | char *name = NULL; |
5a1d7843 JS |
1411 | int namelen; |
1412 | int ret; | |
1413 | int search_done = 0; | |
f186373f MF |
1414 | int log_ref_ver = 0; |
1415 | u64 parent_objectid; | |
1416 | u64 inode_objectid; | |
f46dbe3d | 1417 | u64 ref_index = 0; |
f186373f MF |
1418 | int ref_struct_size; |
1419 | ||
1420 | ref_ptr = btrfs_item_ptr_offset(eb, slot); | |
1421 | ref_end = ref_ptr + btrfs_item_size_nr(eb, slot); | |
1422 | ||
1423 | if (key->type == BTRFS_INODE_EXTREF_KEY) { | |
1424 | struct btrfs_inode_extref *r; | |
1425 | ||
1426 | ref_struct_size = sizeof(struct btrfs_inode_extref); | |
1427 | log_ref_ver = 1; | |
1428 | r = (struct btrfs_inode_extref *)ref_ptr; | |
1429 | parent_objectid = btrfs_inode_extref_parent(eb, r); | |
1430 | } else { | |
1431 | ref_struct_size = sizeof(struct btrfs_inode_ref); | |
1432 | parent_objectid = key->offset; | |
1433 | } | |
1434 | inode_objectid = key->objectid; | |
e02119d5 | 1435 | |
5a1d7843 JS |
1436 | /* |
1437 | * it is possible that we didn't log all the parent directories | |
1438 | * for a given inode. If we don't find the dir, just don't | |
1439 | * copy the back ref in. The link count fixup code will take | |
1440 | * care of the rest | |
1441 | */ | |
f186373f | 1442 | dir = read_one_inode(root, parent_objectid); |
03b2f08b GB |
1443 | if (!dir) { |
1444 | ret = -ENOENT; | |
1445 | goto out; | |
1446 | } | |
5a1d7843 | 1447 | |
f186373f | 1448 | inode = read_one_inode(root, inode_objectid); |
5a1d7843 | 1449 | if (!inode) { |
03b2f08b GB |
1450 | ret = -EIO; |
1451 | goto out; | |
5a1d7843 JS |
1452 | } |
1453 | ||
5a1d7843 | 1454 | while (ref_ptr < ref_end) { |
f186373f | 1455 | if (log_ref_ver) { |
bae15d95 QW |
1456 | ret = extref_get_fields(eb, ref_ptr, &namelen, &name, |
1457 | &ref_index, &parent_objectid); | |
f186373f MF |
1458 | /* |
1459 | * parent object can change from one array | |
1460 | * item to another. | |
1461 | */ | |
1462 | if (!dir) | |
1463 | dir = read_one_inode(root, parent_objectid); | |
03b2f08b GB |
1464 | if (!dir) { |
1465 | ret = -ENOENT; | |
1466 | goto out; | |
1467 | } | |
f186373f | 1468 | } else { |
bae15d95 QW |
1469 | ret = ref_get_fields(eb, ref_ptr, &namelen, &name, |
1470 | &ref_index); | |
f186373f MF |
1471 | } |
1472 | if (ret) | |
03b2f08b | 1473 | goto out; |
5a1d7843 JS |
1474 | |
1475 | /* if we already have a perfect match, we're done */ | |
f85b7379 DS |
1476 | if (!inode_in_dir(root, path, btrfs_ino(BTRFS_I(dir)), |
1477 | btrfs_ino(BTRFS_I(inode)), ref_index, | |
1478 | name, namelen)) { | |
5a1d7843 JS |
1479 | /* |
1480 | * look for a conflicting back reference in the | |
1481 | * metadata. if we find one we have to unlink that name | |
1482 | * of the file before we add our new link. Later on, we | |
1483 | * overwrite any existing back reference, and we don't | |
1484 | * want to create dangling pointers in the directory. | |
1485 | */ | |
1486 | ||
1487 | if (!search_done) { | |
1488 | ret = __add_inode_ref(trans, root, path, log, | |
94c91a1f | 1489 | BTRFS_I(dir), |
d75eefdf | 1490 | BTRFS_I(inode), |
f186373f MF |
1491 | inode_objectid, |
1492 | parent_objectid, | |
1493 | ref_index, name, namelen, | |
5a1d7843 | 1494 | &search_done); |
03b2f08b GB |
1495 | if (ret) { |
1496 | if (ret == 1) | |
1497 | ret = 0; | |
3650860b JB |
1498 | goto out; |
1499 | } | |
5a1d7843 JS |
1500 | } |
1501 | ||
0d836392 FM |
1502 | /* |
1503 | * If a reference item already exists for this inode | |
1504 | * with the same parent and name, but different index, | |
1505 | * drop it and the corresponding directory index entries | |
1506 | * from the parent before adding the new reference item | |
1507 | * and dir index entries, otherwise we would fail with | |
1508 | * -EEXIST returned from btrfs_add_link() below. | |
1509 | */ | |
1510 | ret = btrfs_inode_ref_exists(inode, dir, key->type, | |
1511 | name, namelen); | |
1512 | if (ret > 0) { | |
1513 | ret = btrfs_unlink_inode(trans, root, | |
1514 | BTRFS_I(dir), | |
1515 | BTRFS_I(inode), | |
1516 | name, namelen); | |
1517 | /* | |
1518 | * If we dropped the link count to 0, bump it so | |
1519 | * that later the iput() on the inode will not | |
1520 | * free it. We will fixup the link count later. | |
1521 | */ | |
1522 | if (!ret && inode->i_nlink == 0) | |
1523 | inc_nlink(inode); | |
1524 | } | |
1525 | if (ret < 0) | |
1526 | goto out; | |
1527 | ||
5a1d7843 | 1528 | /* insert our name */ |
6b5fc433 FM |
1529 | ret = add_link(trans, root, dir, inode, name, namelen, |
1530 | ref_index); | |
3650860b JB |
1531 | if (ret) |
1532 | goto out; | |
5a1d7843 | 1533 | |
9a56fcd1 | 1534 | btrfs_update_inode(trans, root, BTRFS_I(inode)); |
5a1d7843 JS |
1535 | } |
1536 | ||
f186373f | 1537 | ref_ptr = (unsigned long)(ref_ptr + ref_struct_size) + namelen; |
5a1d7843 | 1538 | kfree(name); |
03b2f08b | 1539 | name = NULL; |
f186373f MF |
1540 | if (log_ref_ver) { |
1541 | iput(dir); | |
1542 | dir = NULL; | |
1543 | } | |
5a1d7843 | 1544 | } |
e02119d5 | 1545 | |
1f250e92 FM |
1546 | /* |
1547 | * Before we overwrite the inode reference item in the subvolume tree | |
1548 | * with the item from the log tree, we must unlink all names from the | |
1549 | * parent directory that are in the subvolume's tree inode reference | |
1550 | * item, otherwise we end up with an inconsistent subvolume tree where | |
1551 | * dir index entries exist for a name but there is no inode reference | |
1552 | * item with the same name. | |
1553 | */ | |
1554 | ret = unlink_old_inode_refs(trans, root, path, BTRFS_I(inode), eb, slot, | |
1555 | key); | |
1556 | if (ret) | |
1557 | goto out; | |
1558 | ||
e02119d5 CM |
1559 | /* finally write the back reference in the inode */ |
1560 | ret = overwrite_item(trans, root, path, eb, slot, key); | |
5a1d7843 | 1561 | out: |
b3b4aa74 | 1562 | btrfs_release_path(path); |
03b2f08b | 1563 | kfree(name); |
e02119d5 CM |
1564 | iput(dir); |
1565 | iput(inode); | |
3650860b | 1566 | return ret; |
e02119d5 CM |
1567 | } |
1568 | ||
f186373f | 1569 | static int count_inode_extrefs(struct btrfs_root *root, |
36283658 | 1570 | struct btrfs_inode *inode, struct btrfs_path *path) |
f186373f MF |
1571 | { |
1572 | int ret = 0; | |
1573 | int name_len; | |
1574 | unsigned int nlink = 0; | |
1575 | u32 item_size; | |
1576 | u32 cur_offset = 0; | |
36283658 | 1577 | u64 inode_objectid = btrfs_ino(inode); |
f186373f MF |
1578 | u64 offset = 0; |
1579 | unsigned long ptr; | |
1580 | struct btrfs_inode_extref *extref; | |
1581 | struct extent_buffer *leaf; | |
1582 | ||
1583 | while (1) { | |
1584 | ret = btrfs_find_one_extref(root, inode_objectid, offset, path, | |
1585 | &extref, &offset); | |
1586 | if (ret) | |
1587 | break; | |
c71bf099 | 1588 | |
f186373f MF |
1589 | leaf = path->nodes[0]; |
1590 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
1591 | ptr = btrfs_item_ptr_offset(leaf, path->slots[0]); | |
2c2c452b | 1592 | cur_offset = 0; |
f186373f MF |
1593 | |
1594 | while (cur_offset < item_size) { | |
1595 | extref = (struct btrfs_inode_extref *) (ptr + cur_offset); | |
1596 | name_len = btrfs_inode_extref_name_len(leaf, extref); | |
1597 | ||
1598 | nlink++; | |
1599 | ||
1600 | cur_offset += name_len + sizeof(*extref); | |
1601 | } | |
1602 | ||
1603 | offset++; | |
1604 | btrfs_release_path(path); | |
1605 | } | |
1606 | btrfs_release_path(path); | |
1607 | ||
2c2c452b | 1608 | if (ret < 0 && ret != -ENOENT) |
f186373f MF |
1609 | return ret; |
1610 | return nlink; | |
1611 | } | |
1612 | ||
1613 | static int count_inode_refs(struct btrfs_root *root, | |
f329e319 | 1614 | struct btrfs_inode *inode, struct btrfs_path *path) |
e02119d5 | 1615 | { |
e02119d5 CM |
1616 | int ret; |
1617 | struct btrfs_key key; | |
f186373f | 1618 | unsigned int nlink = 0; |
e02119d5 CM |
1619 | unsigned long ptr; |
1620 | unsigned long ptr_end; | |
1621 | int name_len; | |
f329e319 | 1622 | u64 ino = btrfs_ino(inode); |
e02119d5 | 1623 | |
33345d01 | 1624 | key.objectid = ino; |
e02119d5 CM |
1625 | key.type = BTRFS_INODE_REF_KEY; |
1626 | key.offset = (u64)-1; | |
1627 | ||
d397712b | 1628 | while (1) { |
e02119d5 CM |
1629 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
1630 | if (ret < 0) | |
1631 | break; | |
1632 | if (ret > 0) { | |
1633 | if (path->slots[0] == 0) | |
1634 | break; | |
1635 | path->slots[0]--; | |
1636 | } | |
e93ae26f | 1637 | process_slot: |
e02119d5 CM |
1638 | btrfs_item_key_to_cpu(path->nodes[0], &key, |
1639 | path->slots[0]); | |
33345d01 | 1640 | if (key.objectid != ino || |
e02119d5 CM |
1641 | key.type != BTRFS_INODE_REF_KEY) |
1642 | break; | |
1643 | ptr = btrfs_item_ptr_offset(path->nodes[0], path->slots[0]); | |
1644 | ptr_end = ptr + btrfs_item_size_nr(path->nodes[0], | |
1645 | path->slots[0]); | |
d397712b | 1646 | while (ptr < ptr_end) { |
e02119d5 CM |
1647 | struct btrfs_inode_ref *ref; |
1648 | ||
1649 | ref = (struct btrfs_inode_ref *)ptr; | |
1650 | name_len = btrfs_inode_ref_name_len(path->nodes[0], | |
1651 | ref); | |
1652 | ptr = (unsigned long)(ref + 1) + name_len; | |
1653 | nlink++; | |
1654 | } | |
1655 | ||
1656 | if (key.offset == 0) | |
1657 | break; | |
e93ae26f FDBM |
1658 | if (path->slots[0] > 0) { |
1659 | path->slots[0]--; | |
1660 | goto process_slot; | |
1661 | } | |
e02119d5 | 1662 | key.offset--; |
b3b4aa74 | 1663 | btrfs_release_path(path); |
e02119d5 | 1664 | } |
b3b4aa74 | 1665 | btrfs_release_path(path); |
f186373f MF |
1666 | |
1667 | return nlink; | |
1668 | } | |
1669 | ||
1670 | /* | |
1671 | * There are a few corners where the link count of the file can't | |
1672 | * be properly maintained during replay. So, instead of adding | |
1673 | * lots of complexity to the log code, we just scan the backrefs | |
1674 | * for any file that has been through replay. | |
1675 | * | |
1676 | * The scan will update the link count on the inode to reflect the | |
1677 | * number of back refs found. If it goes down to zero, the iput | |
1678 | * will free the inode. | |
1679 | */ | |
1680 | static noinline int fixup_inode_link_count(struct btrfs_trans_handle *trans, | |
1681 | struct btrfs_root *root, | |
1682 | struct inode *inode) | |
1683 | { | |
1684 | struct btrfs_path *path; | |
1685 | int ret; | |
1686 | u64 nlink = 0; | |
4a0cc7ca | 1687 | u64 ino = btrfs_ino(BTRFS_I(inode)); |
f186373f MF |
1688 | |
1689 | path = btrfs_alloc_path(); | |
1690 | if (!path) | |
1691 | return -ENOMEM; | |
1692 | ||
f329e319 | 1693 | ret = count_inode_refs(root, BTRFS_I(inode), path); |
f186373f MF |
1694 | if (ret < 0) |
1695 | goto out; | |
1696 | ||
1697 | nlink = ret; | |
1698 | ||
36283658 | 1699 | ret = count_inode_extrefs(root, BTRFS_I(inode), path); |
f186373f MF |
1700 | if (ret < 0) |
1701 | goto out; | |
1702 | ||
1703 | nlink += ret; | |
1704 | ||
1705 | ret = 0; | |
1706 | ||
e02119d5 | 1707 | if (nlink != inode->i_nlink) { |
bfe86848 | 1708 | set_nlink(inode, nlink); |
9a56fcd1 | 1709 | btrfs_update_inode(trans, root, BTRFS_I(inode)); |
e02119d5 | 1710 | } |
8d5bf1cb | 1711 | BTRFS_I(inode)->index_cnt = (u64)-1; |
e02119d5 | 1712 | |
c71bf099 YZ |
1713 | if (inode->i_nlink == 0) { |
1714 | if (S_ISDIR(inode->i_mode)) { | |
1715 | ret = replay_dir_deletes(trans, root, NULL, path, | |
33345d01 | 1716 | ino, 1); |
3650860b JB |
1717 | if (ret) |
1718 | goto out; | |
c71bf099 | 1719 | } |
ecdcf3c2 NB |
1720 | ret = btrfs_insert_orphan_item(trans, root, ino); |
1721 | if (ret == -EEXIST) | |
1722 | ret = 0; | |
12fcfd22 | 1723 | } |
12fcfd22 | 1724 | |
f186373f MF |
1725 | out: |
1726 | btrfs_free_path(path); | |
1727 | return ret; | |
e02119d5 CM |
1728 | } |
1729 | ||
1730 | static noinline int fixup_inode_link_counts(struct btrfs_trans_handle *trans, | |
1731 | struct btrfs_root *root, | |
1732 | struct btrfs_path *path) | |
1733 | { | |
1734 | int ret; | |
1735 | struct btrfs_key key; | |
1736 | struct inode *inode; | |
1737 | ||
1738 | key.objectid = BTRFS_TREE_LOG_FIXUP_OBJECTID; | |
1739 | key.type = BTRFS_ORPHAN_ITEM_KEY; | |
1740 | key.offset = (u64)-1; | |
d397712b | 1741 | while (1) { |
e02119d5 CM |
1742 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
1743 | if (ret < 0) | |
1744 | break; | |
1745 | ||
1746 | if (ret == 1) { | |
1747 | if (path->slots[0] == 0) | |
1748 | break; | |
1749 | path->slots[0]--; | |
1750 | } | |
1751 | ||
1752 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
1753 | if (key.objectid != BTRFS_TREE_LOG_FIXUP_OBJECTID || | |
1754 | key.type != BTRFS_ORPHAN_ITEM_KEY) | |
1755 | break; | |
1756 | ||
1757 | ret = btrfs_del_item(trans, root, path); | |
65a246c5 TI |
1758 | if (ret) |
1759 | goto out; | |
e02119d5 | 1760 | |
b3b4aa74 | 1761 | btrfs_release_path(path); |
e02119d5 | 1762 | inode = read_one_inode(root, key.offset); |
c00e9493 TI |
1763 | if (!inode) |
1764 | return -EIO; | |
e02119d5 CM |
1765 | |
1766 | ret = fixup_inode_link_count(trans, root, inode); | |
e02119d5 | 1767 | iput(inode); |
3650860b JB |
1768 | if (ret) |
1769 | goto out; | |
e02119d5 | 1770 | |
12fcfd22 CM |
1771 | /* |
1772 | * fixup on a directory may create new entries, | |
1773 | * make sure we always look for the highset possible | |
1774 | * offset | |
1775 | */ | |
1776 | key.offset = (u64)-1; | |
e02119d5 | 1777 | } |
65a246c5 TI |
1778 | ret = 0; |
1779 | out: | |
b3b4aa74 | 1780 | btrfs_release_path(path); |
65a246c5 | 1781 | return ret; |
e02119d5 CM |
1782 | } |
1783 | ||
1784 | ||
1785 | /* | |
1786 | * record a given inode in the fixup dir so we can check its link | |
1787 | * count when replay is done. The link count is incremented here | |
1788 | * so the inode won't go away until we check it | |
1789 | */ | |
1790 | static noinline int link_to_fixup_dir(struct btrfs_trans_handle *trans, | |
1791 | struct btrfs_root *root, | |
1792 | struct btrfs_path *path, | |
1793 | u64 objectid) | |
1794 | { | |
1795 | struct btrfs_key key; | |
1796 | int ret = 0; | |
1797 | struct inode *inode; | |
1798 | ||
1799 | inode = read_one_inode(root, objectid); | |
c00e9493 TI |
1800 | if (!inode) |
1801 | return -EIO; | |
e02119d5 CM |
1802 | |
1803 | key.objectid = BTRFS_TREE_LOG_FIXUP_OBJECTID; | |
962a298f | 1804 | key.type = BTRFS_ORPHAN_ITEM_KEY; |
e02119d5 CM |
1805 | key.offset = objectid; |
1806 | ||
1807 | ret = btrfs_insert_empty_item(trans, root, path, &key, 0); | |
1808 | ||
b3b4aa74 | 1809 | btrfs_release_path(path); |
e02119d5 | 1810 | if (ret == 0) { |
9bf7a489 JB |
1811 | if (!inode->i_nlink) |
1812 | set_nlink(inode, 1); | |
1813 | else | |
8b558c5f | 1814 | inc_nlink(inode); |
9a56fcd1 | 1815 | ret = btrfs_update_inode(trans, root, BTRFS_I(inode)); |
e02119d5 CM |
1816 | } else if (ret == -EEXIST) { |
1817 | ret = 0; | |
1818 | } else { | |
3650860b | 1819 | BUG(); /* Logic Error */ |
e02119d5 CM |
1820 | } |
1821 | iput(inode); | |
1822 | ||
1823 | return ret; | |
1824 | } | |
1825 | ||
1826 | /* | |
1827 | * when replaying the log for a directory, we only insert names | |
1828 | * for inodes that actually exist. This means an fsync on a directory | |
1829 | * does not implicitly fsync all the new files in it | |
1830 | */ | |
1831 | static noinline int insert_one_name(struct btrfs_trans_handle *trans, | |
1832 | struct btrfs_root *root, | |
e02119d5 | 1833 | u64 dirid, u64 index, |
60d53eb3 | 1834 | char *name, int name_len, |
e02119d5 CM |
1835 | struct btrfs_key *location) |
1836 | { | |
1837 | struct inode *inode; | |
1838 | struct inode *dir; | |
1839 | int ret; | |
1840 | ||
1841 | inode = read_one_inode(root, location->objectid); | |
1842 | if (!inode) | |
1843 | return -ENOENT; | |
1844 | ||
1845 | dir = read_one_inode(root, dirid); | |
1846 | if (!dir) { | |
1847 | iput(inode); | |
1848 | return -EIO; | |
1849 | } | |
d555438b | 1850 | |
db0a669f NB |
1851 | ret = btrfs_add_link(trans, BTRFS_I(dir), BTRFS_I(inode), name, |
1852 | name_len, 1, index); | |
e02119d5 CM |
1853 | |
1854 | /* FIXME, put inode into FIXUP list */ | |
1855 | ||
1856 | iput(inode); | |
1857 | iput(dir); | |
1858 | return ret; | |
1859 | } | |
1860 | ||
1861 | /* | |
1862 | * take a single entry in a log directory item and replay it into | |
1863 | * the subvolume. | |
1864 | * | |
1865 | * if a conflicting item exists in the subdirectory already, | |
1866 | * the inode it points to is unlinked and put into the link count | |
1867 | * fix up tree. | |
1868 | * | |
1869 | * If a name from the log points to a file or directory that does | |
1870 | * not exist in the FS, it is skipped. fsyncs on directories | |
1871 | * do not force down inodes inside that directory, just changes to the | |
1872 | * names or unlinks in a directory. | |
bb53eda9 FM |
1873 | * |
1874 | * Returns < 0 on error, 0 if the name wasn't replayed (dentry points to a | |
1875 | * non-existing inode) and 1 if the name was replayed. | |
e02119d5 CM |
1876 | */ |
1877 | static noinline int replay_one_name(struct btrfs_trans_handle *trans, | |
1878 | struct btrfs_root *root, | |
1879 | struct btrfs_path *path, | |
1880 | struct extent_buffer *eb, | |
1881 | struct btrfs_dir_item *di, | |
1882 | struct btrfs_key *key) | |
1883 | { | |
1884 | char *name; | |
1885 | int name_len; | |
1886 | struct btrfs_dir_item *dst_di; | |
1887 | struct btrfs_key found_key; | |
1888 | struct btrfs_key log_key; | |
1889 | struct inode *dir; | |
e02119d5 | 1890 | u8 log_type; |
4bef0848 | 1891 | int exists; |
3650860b | 1892 | int ret = 0; |
d555438b | 1893 | bool update_size = (key->type == BTRFS_DIR_INDEX_KEY); |
bb53eda9 | 1894 | bool name_added = false; |
e02119d5 CM |
1895 | |
1896 | dir = read_one_inode(root, key->objectid); | |
c00e9493 TI |
1897 | if (!dir) |
1898 | return -EIO; | |
e02119d5 CM |
1899 | |
1900 | name_len = btrfs_dir_name_len(eb, di); | |
1901 | name = kmalloc(name_len, GFP_NOFS); | |
2bac325e FDBM |
1902 | if (!name) { |
1903 | ret = -ENOMEM; | |
1904 | goto out; | |
1905 | } | |
2a29edc6 | 1906 | |
e02119d5 CM |
1907 | log_type = btrfs_dir_type(eb, di); |
1908 | read_extent_buffer(eb, name, (unsigned long)(di + 1), | |
1909 | name_len); | |
1910 | ||
1911 | btrfs_dir_item_key_to_cpu(eb, di, &log_key); | |
4bef0848 CM |
1912 | exists = btrfs_lookup_inode(trans, root, path, &log_key, 0); |
1913 | if (exists == 0) | |
1914 | exists = 1; | |
1915 | else | |
1916 | exists = 0; | |
b3b4aa74 | 1917 | btrfs_release_path(path); |
4bef0848 | 1918 | |
e02119d5 CM |
1919 | if (key->type == BTRFS_DIR_ITEM_KEY) { |
1920 | dst_di = btrfs_lookup_dir_item(trans, root, path, key->objectid, | |
1921 | name, name_len, 1); | |
d397712b | 1922 | } else if (key->type == BTRFS_DIR_INDEX_KEY) { |
e02119d5 CM |
1923 | dst_di = btrfs_lookup_dir_index_item(trans, root, path, |
1924 | key->objectid, | |
1925 | key->offset, name, | |
1926 | name_len, 1); | |
1927 | } else { | |
3650860b JB |
1928 | /* Corruption */ |
1929 | ret = -EINVAL; | |
1930 | goto out; | |
e02119d5 | 1931 | } |
c704005d | 1932 | if (IS_ERR_OR_NULL(dst_di)) { |
e02119d5 CM |
1933 | /* we need a sequence number to insert, so we only |
1934 | * do inserts for the BTRFS_DIR_INDEX_KEY types | |
1935 | */ | |
1936 | if (key->type != BTRFS_DIR_INDEX_KEY) | |
1937 | goto out; | |
1938 | goto insert; | |
1939 | } | |
1940 | ||
1941 | btrfs_dir_item_key_to_cpu(path->nodes[0], dst_di, &found_key); | |
1942 | /* the existing item matches the logged item */ | |
1943 | if (found_key.objectid == log_key.objectid && | |
1944 | found_key.type == log_key.type && | |
1945 | found_key.offset == log_key.offset && | |
1946 | btrfs_dir_type(path->nodes[0], dst_di) == log_type) { | |
a2cc11db | 1947 | update_size = false; |
e02119d5 CM |
1948 | goto out; |
1949 | } | |
1950 | ||
1951 | /* | |
1952 | * don't drop the conflicting directory entry if the inode | |
1953 | * for the new entry doesn't exist | |
1954 | */ | |
4bef0848 | 1955 | if (!exists) |
e02119d5 CM |
1956 | goto out; |
1957 | ||
207e7d92 | 1958 | ret = drop_one_dir_item(trans, root, path, BTRFS_I(dir), dst_di); |
3650860b JB |
1959 | if (ret) |
1960 | goto out; | |
e02119d5 CM |
1961 | |
1962 | if (key->type == BTRFS_DIR_INDEX_KEY) | |
1963 | goto insert; | |
1964 | out: | |
b3b4aa74 | 1965 | btrfs_release_path(path); |
d555438b | 1966 | if (!ret && update_size) { |
6ef06d27 | 1967 | btrfs_i_size_write(BTRFS_I(dir), dir->i_size + name_len * 2); |
9a56fcd1 | 1968 | ret = btrfs_update_inode(trans, root, BTRFS_I(dir)); |
d555438b | 1969 | } |
e02119d5 CM |
1970 | kfree(name); |
1971 | iput(dir); | |
bb53eda9 FM |
1972 | if (!ret && name_added) |
1973 | ret = 1; | |
3650860b | 1974 | return ret; |
e02119d5 CM |
1975 | |
1976 | insert: | |
725af92a NB |
1977 | /* |
1978 | * Check if the inode reference exists in the log for the given name, | |
1979 | * inode and parent inode | |
1980 | */ | |
1981 | found_key.objectid = log_key.objectid; | |
1982 | found_key.type = BTRFS_INODE_REF_KEY; | |
1983 | found_key.offset = key->objectid; | |
1984 | ret = backref_in_log(root->log_root, &found_key, 0, name, name_len); | |
1985 | if (ret < 0) { | |
1986 | goto out; | |
1987 | } else if (ret) { | |
1988 | /* The dentry will be added later. */ | |
1989 | ret = 0; | |
1990 | update_size = false; | |
1991 | goto out; | |
1992 | } | |
1993 | ||
1994 | found_key.objectid = log_key.objectid; | |
1995 | found_key.type = BTRFS_INODE_EXTREF_KEY; | |
1996 | found_key.offset = key->objectid; | |
1997 | ret = backref_in_log(root->log_root, &found_key, key->objectid, name, | |
1998 | name_len); | |
1999 | if (ret < 0) { | |
2000 | goto out; | |
2001 | } else if (ret) { | |
df8d116f FM |
2002 | /* The dentry will be added later. */ |
2003 | ret = 0; | |
2004 | update_size = false; | |
2005 | goto out; | |
2006 | } | |
b3b4aa74 | 2007 | btrfs_release_path(path); |
60d53eb3 Z |
2008 | ret = insert_one_name(trans, root, key->objectid, key->offset, |
2009 | name, name_len, &log_key); | |
df8d116f | 2010 | if (ret && ret != -ENOENT && ret != -EEXIST) |
3650860b | 2011 | goto out; |
bb53eda9 FM |
2012 | if (!ret) |
2013 | name_added = true; | |
d555438b | 2014 | update_size = false; |
3650860b | 2015 | ret = 0; |
e02119d5 CM |
2016 | goto out; |
2017 | } | |
2018 | ||
2019 | /* | |
2020 | * find all the names in a directory item and reconcile them into | |
2021 | * the subvolume. Only BTRFS_DIR_ITEM_KEY types will have more than | |
2022 | * one name in a directory item, but the same code gets used for | |
2023 | * both directory index types | |
2024 | */ | |
2025 | static noinline int replay_one_dir_item(struct btrfs_trans_handle *trans, | |
2026 | struct btrfs_root *root, | |
2027 | struct btrfs_path *path, | |
2028 | struct extent_buffer *eb, int slot, | |
2029 | struct btrfs_key *key) | |
2030 | { | |
bb53eda9 | 2031 | int ret = 0; |
e02119d5 CM |
2032 | u32 item_size = btrfs_item_size_nr(eb, slot); |
2033 | struct btrfs_dir_item *di; | |
2034 | int name_len; | |
2035 | unsigned long ptr; | |
2036 | unsigned long ptr_end; | |
bb53eda9 | 2037 | struct btrfs_path *fixup_path = NULL; |
e02119d5 CM |
2038 | |
2039 | ptr = btrfs_item_ptr_offset(eb, slot); | |
2040 | ptr_end = ptr + item_size; | |
d397712b | 2041 | while (ptr < ptr_end) { |
e02119d5 CM |
2042 | di = (struct btrfs_dir_item *)ptr; |
2043 | name_len = btrfs_dir_name_len(eb, di); | |
2044 | ret = replay_one_name(trans, root, path, eb, di, key); | |
bb53eda9 FM |
2045 | if (ret < 0) |
2046 | break; | |
e02119d5 CM |
2047 | ptr = (unsigned long)(di + 1); |
2048 | ptr += name_len; | |
bb53eda9 FM |
2049 | |
2050 | /* | |
2051 | * If this entry refers to a non-directory (directories can not | |
2052 | * have a link count > 1) and it was added in the transaction | |
2053 | * that was not committed, make sure we fixup the link count of | |
2054 | * the inode it the entry points to. Otherwise something like | |
2055 | * the following would result in a directory pointing to an | |
2056 | * inode with a wrong link that does not account for this dir | |
2057 | * entry: | |
2058 | * | |
2059 | * mkdir testdir | |
2060 | * touch testdir/foo | |
2061 | * touch testdir/bar | |
2062 | * sync | |
2063 | * | |
2064 | * ln testdir/bar testdir/bar_link | |
2065 | * ln testdir/foo testdir/foo_link | |
2066 | * xfs_io -c "fsync" testdir/bar | |
2067 | * | |
2068 | * <power failure> | |
2069 | * | |
2070 | * mount fs, log replay happens | |
2071 | * | |
2072 | * File foo would remain with a link count of 1 when it has two | |
2073 | * entries pointing to it in the directory testdir. This would | |
2074 | * make it impossible to ever delete the parent directory has | |
2075 | * it would result in stale dentries that can never be deleted. | |
2076 | */ | |
2077 | if (ret == 1 && btrfs_dir_type(eb, di) != BTRFS_FT_DIR) { | |
2078 | struct btrfs_key di_key; | |
2079 | ||
2080 | if (!fixup_path) { | |
2081 | fixup_path = btrfs_alloc_path(); | |
2082 | if (!fixup_path) { | |
2083 | ret = -ENOMEM; | |
2084 | break; | |
2085 | } | |
2086 | } | |
2087 | ||
2088 | btrfs_dir_item_key_to_cpu(eb, di, &di_key); | |
2089 | ret = link_to_fixup_dir(trans, root, fixup_path, | |
2090 | di_key.objectid); | |
2091 | if (ret) | |
2092 | break; | |
2093 | } | |
2094 | ret = 0; | |
e02119d5 | 2095 | } |
bb53eda9 FM |
2096 | btrfs_free_path(fixup_path); |
2097 | return ret; | |
e02119d5 CM |
2098 | } |
2099 | ||
2100 | /* | |
2101 | * directory replay has two parts. There are the standard directory | |
2102 | * items in the log copied from the subvolume, and range items | |
2103 | * created in the log while the subvolume was logged. | |
2104 | * | |
2105 | * The range items tell us which parts of the key space the log | |
2106 | * is authoritative for. During replay, if a key in the subvolume | |
2107 | * directory is in a logged range item, but not actually in the log | |
2108 | * that means it was deleted from the directory before the fsync | |
2109 | * and should be removed. | |
2110 | */ | |
2111 | static noinline int find_dir_range(struct btrfs_root *root, | |
2112 | struct btrfs_path *path, | |
2113 | u64 dirid, int key_type, | |
2114 | u64 *start_ret, u64 *end_ret) | |
2115 | { | |
2116 | struct btrfs_key key; | |
2117 | u64 found_end; | |
2118 | struct btrfs_dir_log_item *item; | |
2119 | int ret; | |
2120 | int nritems; | |
2121 | ||
2122 | if (*start_ret == (u64)-1) | |
2123 | return 1; | |
2124 | ||
2125 | key.objectid = dirid; | |
2126 | key.type = key_type; | |
2127 | key.offset = *start_ret; | |
2128 | ||
2129 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
2130 | if (ret < 0) | |
2131 | goto out; | |
2132 | if (ret > 0) { | |
2133 | if (path->slots[0] == 0) | |
2134 | goto out; | |
2135 | path->slots[0]--; | |
2136 | } | |
2137 | if (ret != 0) | |
2138 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
2139 | ||
2140 | if (key.type != key_type || key.objectid != dirid) { | |
2141 | ret = 1; | |
2142 | goto next; | |
2143 | } | |
2144 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
2145 | struct btrfs_dir_log_item); | |
2146 | found_end = btrfs_dir_log_end(path->nodes[0], item); | |
2147 | ||
2148 | if (*start_ret >= key.offset && *start_ret <= found_end) { | |
2149 | ret = 0; | |
2150 | *start_ret = key.offset; | |
2151 | *end_ret = found_end; | |
2152 | goto out; | |
2153 | } | |
2154 | ret = 1; | |
2155 | next: | |
2156 | /* check the next slot in the tree to see if it is a valid item */ | |
2157 | nritems = btrfs_header_nritems(path->nodes[0]); | |
2a7bf53f | 2158 | path->slots[0]++; |
e02119d5 CM |
2159 | if (path->slots[0] >= nritems) { |
2160 | ret = btrfs_next_leaf(root, path); | |
2161 | if (ret) | |
2162 | goto out; | |
e02119d5 CM |
2163 | } |
2164 | ||
2165 | btrfs_item_key_to_cpu(path->nodes[0], &key, path->slots[0]); | |
2166 | ||
2167 | if (key.type != key_type || key.objectid != dirid) { | |
2168 | ret = 1; | |
2169 | goto out; | |
2170 | } | |
2171 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
2172 | struct btrfs_dir_log_item); | |
2173 | found_end = btrfs_dir_log_end(path->nodes[0], item); | |
2174 | *start_ret = key.offset; | |
2175 | *end_ret = found_end; | |
2176 | ret = 0; | |
2177 | out: | |
b3b4aa74 | 2178 | btrfs_release_path(path); |
e02119d5 CM |
2179 | return ret; |
2180 | } | |
2181 | ||
2182 | /* | |
2183 | * this looks for a given directory item in the log. If the directory | |
2184 | * item is not in the log, the item is removed and the inode it points | |
2185 | * to is unlinked | |
2186 | */ | |
2187 | static noinline int check_item_in_log(struct btrfs_trans_handle *trans, | |
2188 | struct btrfs_root *root, | |
2189 | struct btrfs_root *log, | |
2190 | struct btrfs_path *path, | |
2191 | struct btrfs_path *log_path, | |
2192 | struct inode *dir, | |
2193 | struct btrfs_key *dir_key) | |
2194 | { | |
2195 | int ret; | |
2196 | struct extent_buffer *eb; | |
2197 | int slot; | |
2198 | u32 item_size; | |
2199 | struct btrfs_dir_item *di; | |
2200 | struct btrfs_dir_item *log_di; | |
2201 | int name_len; | |
2202 | unsigned long ptr; | |
2203 | unsigned long ptr_end; | |
2204 | char *name; | |
2205 | struct inode *inode; | |
2206 | struct btrfs_key location; | |
2207 | ||
2208 | again: | |
2209 | eb = path->nodes[0]; | |
2210 | slot = path->slots[0]; | |
2211 | item_size = btrfs_item_size_nr(eb, slot); | |
2212 | ptr = btrfs_item_ptr_offset(eb, slot); | |
2213 | ptr_end = ptr + item_size; | |
d397712b | 2214 | while (ptr < ptr_end) { |
e02119d5 CM |
2215 | di = (struct btrfs_dir_item *)ptr; |
2216 | name_len = btrfs_dir_name_len(eb, di); | |
2217 | name = kmalloc(name_len, GFP_NOFS); | |
2218 | if (!name) { | |
2219 | ret = -ENOMEM; | |
2220 | goto out; | |
2221 | } | |
2222 | read_extent_buffer(eb, name, (unsigned long)(di + 1), | |
2223 | name_len); | |
2224 | log_di = NULL; | |
12fcfd22 | 2225 | if (log && dir_key->type == BTRFS_DIR_ITEM_KEY) { |
e02119d5 CM |
2226 | log_di = btrfs_lookup_dir_item(trans, log, log_path, |
2227 | dir_key->objectid, | |
2228 | name, name_len, 0); | |
12fcfd22 | 2229 | } else if (log && dir_key->type == BTRFS_DIR_INDEX_KEY) { |
e02119d5 CM |
2230 | log_di = btrfs_lookup_dir_index_item(trans, log, |
2231 | log_path, | |
2232 | dir_key->objectid, | |
2233 | dir_key->offset, | |
2234 | name, name_len, 0); | |
2235 | } | |
8d9e220c | 2236 | if (!log_di || log_di == ERR_PTR(-ENOENT)) { |
e02119d5 | 2237 | btrfs_dir_item_key_to_cpu(eb, di, &location); |
b3b4aa74 DS |
2238 | btrfs_release_path(path); |
2239 | btrfs_release_path(log_path); | |
e02119d5 | 2240 | inode = read_one_inode(root, location.objectid); |
c00e9493 TI |
2241 | if (!inode) { |
2242 | kfree(name); | |
2243 | return -EIO; | |
2244 | } | |
e02119d5 CM |
2245 | |
2246 | ret = link_to_fixup_dir(trans, root, | |
2247 | path, location.objectid); | |
3650860b JB |
2248 | if (ret) { |
2249 | kfree(name); | |
2250 | iput(inode); | |
2251 | goto out; | |
2252 | } | |
2253 | ||
8b558c5f | 2254 | inc_nlink(inode); |
4ec5934e NB |
2255 | ret = btrfs_unlink_inode(trans, root, BTRFS_I(dir), |
2256 | BTRFS_I(inode), name, name_len); | |
3650860b | 2257 | if (!ret) |
e5c304e6 | 2258 | ret = btrfs_run_delayed_items(trans); |
e02119d5 CM |
2259 | kfree(name); |
2260 | iput(inode); | |
3650860b JB |
2261 | if (ret) |
2262 | goto out; | |
e02119d5 CM |
2263 | |
2264 | /* there might still be more names under this key | |
2265 | * check and repeat if required | |
2266 | */ | |
2267 | ret = btrfs_search_slot(NULL, root, dir_key, path, | |
2268 | 0, 0); | |
2269 | if (ret == 0) | |
2270 | goto again; | |
2271 | ret = 0; | |
2272 | goto out; | |
269d040f FDBM |
2273 | } else if (IS_ERR(log_di)) { |
2274 | kfree(name); | |
2275 | return PTR_ERR(log_di); | |
e02119d5 | 2276 | } |
b3b4aa74 | 2277 | btrfs_release_path(log_path); |
e02119d5 CM |
2278 | kfree(name); |
2279 | ||
2280 | ptr = (unsigned long)(di + 1); | |
2281 | ptr += name_len; | |
2282 | } | |
2283 | ret = 0; | |
2284 | out: | |
b3b4aa74 DS |
2285 | btrfs_release_path(path); |
2286 | btrfs_release_path(log_path); | |
e02119d5 CM |
2287 | return ret; |
2288 | } | |
2289 | ||
4f764e51 FM |
2290 | static int replay_xattr_deletes(struct btrfs_trans_handle *trans, |
2291 | struct btrfs_root *root, | |
2292 | struct btrfs_root *log, | |
2293 | struct btrfs_path *path, | |
2294 | const u64 ino) | |
2295 | { | |
2296 | struct btrfs_key search_key; | |
2297 | struct btrfs_path *log_path; | |
2298 | int i; | |
2299 | int nritems; | |
2300 | int ret; | |
2301 | ||
2302 | log_path = btrfs_alloc_path(); | |
2303 | if (!log_path) | |
2304 | return -ENOMEM; | |
2305 | ||
2306 | search_key.objectid = ino; | |
2307 | search_key.type = BTRFS_XATTR_ITEM_KEY; | |
2308 | search_key.offset = 0; | |
2309 | again: | |
2310 | ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0); | |
2311 | if (ret < 0) | |
2312 | goto out; | |
2313 | process_leaf: | |
2314 | nritems = btrfs_header_nritems(path->nodes[0]); | |
2315 | for (i = path->slots[0]; i < nritems; i++) { | |
2316 | struct btrfs_key key; | |
2317 | struct btrfs_dir_item *di; | |
2318 | struct btrfs_dir_item *log_di; | |
2319 | u32 total_size; | |
2320 | u32 cur; | |
2321 | ||
2322 | btrfs_item_key_to_cpu(path->nodes[0], &key, i); | |
2323 | if (key.objectid != ino || key.type != BTRFS_XATTR_ITEM_KEY) { | |
2324 | ret = 0; | |
2325 | goto out; | |
2326 | } | |
2327 | ||
2328 | di = btrfs_item_ptr(path->nodes[0], i, struct btrfs_dir_item); | |
2329 | total_size = btrfs_item_size_nr(path->nodes[0], i); | |
2330 | cur = 0; | |
2331 | while (cur < total_size) { | |
2332 | u16 name_len = btrfs_dir_name_len(path->nodes[0], di); | |
2333 | u16 data_len = btrfs_dir_data_len(path->nodes[0], di); | |
2334 | u32 this_len = sizeof(*di) + name_len + data_len; | |
2335 | char *name; | |
2336 | ||
2337 | name = kmalloc(name_len, GFP_NOFS); | |
2338 | if (!name) { | |
2339 | ret = -ENOMEM; | |
2340 | goto out; | |
2341 | } | |
2342 | read_extent_buffer(path->nodes[0], name, | |
2343 | (unsigned long)(di + 1), name_len); | |
2344 | ||
2345 | log_di = btrfs_lookup_xattr(NULL, log, log_path, ino, | |
2346 | name, name_len, 0); | |
2347 | btrfs_release_path(log_path); | |
2348 | if (!log_di) { | |
2349 | /* Doesn't exist in log tree, so delete it. */ | |
2350 | btrfs_release_path(path); | |
2351 | di = btrfs_lookup_xattr(trans, root, path, ino, | |
2352 | name, name_len, -1); | |
2353 | kfree(name); | |
2354 | if (IS_ERR(di)) { | |
2355 | ret = PTR_ERR(di); | |
2356 | goto out; | |
2357 | } | |
2358 | ASSERT(di); | |
2359 | ret = btrfs_delete_one_dir_name(trans, root, | |
2360 | path, di); | |
2361 | if (ret) | |
2362 | goto out; | |
2363 | btrfs_release_path(path); | |
2364 | search_key = key; | |
2365 | goto again; | |
2366 | } | |
2367 | kfree(name); | |
2368 | if (IS_ERR(log_di)) { | |
2369 | ret = PTR_ERR(log_di); | |
2370 | goto out; | |
2371 | } | |
2372 | cur += this_len; | |
2373 | di = (struct btrfs_dir_item *)((char *)di + this_len); | |
2374 | } | |
2375 | } | |
2376 | ret = btrfs_next_leaf(root, path); | |
2377 | if (ret > 0) | |
2378 | ret = 0; | |
2379 | else if (ret == 0) | |
2380 | goto process_leaf; | |
2381 | out: | |
2382 | btrfs_free_path(log_path); | |
2383 | btrfs_release_path(path); | |
2384 | return ret; | |
2385 | } | |
2386 | ||
2387 | ||
e02119d5 CM |
2388 | /* |
2389 | * deletion replay happens before we copy any new directory items | |
2390 | * out of the log or out of backreferences from inodes. It | |
2391 | * scans the log to find ranges of keys that log is authoritative for, | |
2392 | * and then scans the directory to find items in those ranges that are | |
2393 | * not present in the log. | |
2394 | * | |
2395 | * Anything we don't find in the log is unlinked and removed from the | |
2396 | * directory. | |
2397 | */ | |
2398 | static noinline int replay_dir_deletes(struct btrfs_trans_handle *trans, | |
2399 | struct btrfs_root *root, | |
2400 | struct btrfs_root *log, | |
2401 | struct btrfs_path *path, | |
12fcfd22 | 2402 | u64 dirid, int del_all) |
e02119d5 CM |
2403 | { |
2404 | u64 range_start; | |
2405 | u64 range_end; | |
2406 | int key_type = BTRFS_DIR_LOG_ITEM_KEY; | |
2407 | int ret = 0; | |
2408 | struct btrfs_key dir_key; | |
2409 | struct btrfs_key found_key; | |
2410 | struct btrfs_path *log_path; | |
2411 | struct inode *dir; | |
2412 | ||
2413 | dir_key.objectid = dirid; | |
2414 | dir_key.type = BTRFS_DIR_ITEM_KEY; | |
2415 | log_path = btrfs_alloc_path(); | |
2416 | if (!log_path) | |
2417 | return -ENOMEM; | |
2418 | ||
2419 | dir = read_one_inode(root, dirid); | |
2420 | /* it isn't an error if the inode isn't there, that can happen | |
2421 | * because we replay the deletes before we copy in the inode item | |
2422 | * from the log | |
2423 | */ | |
2424 | if (!dir) { | |
2425 | btrfs_free_path(log_path); | |
2426 | return 0; | |
2427 | } | |
2428 | again: | |
2429 | range_start = 0; | |
2430 | range_end = 0; | |
d397712b | 2431 | while (1) { |
12fcfd22 CM |
2432 | if (del_all) |
2433 | range_end = (u64)-1; | |
2434 | else { | |
2435 | ret = find_dir_range(log, path, dirid, key_type, | |
2436 | &range_start, &range_end); | |
2437 | if (ret != 0) | |
2438 | break; | |
2439 | } | |
e02119d5 CM |
2440 | |
2441 | dir_key.offset = range_start; | |
d397712b | 2442 | while (1) { |
e02119d5 CM |
2443 | int nritems; |
2444 | ret = btrfs_search_slot(NULL, root, &dir_key, path, | |
2445 | 0, 0); | |
2446 | if (ret < 0) | |
2447 | goto out; | |
2448 | ||
2449 | nritems = btrfs_header_nritems(path->nodes[0]); | |
2450 | if (path->slots[0] >= nritems) { | |
2451 | ret = btrfs_next_leaf(root, path); | |
b98def7c | 2452 | if (ret == 1) |
e02119d5 | 2453 | break; |
b98def7c LB |
2454 | else if (ret < 0) |
2455 | goto out; | |
e02119d5 CM |
2456 | } |
2457 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
2458 | path->slots[0]); | |
2459 | if (found_key.objectid != dirid || | |
2460 | found_key.type != dir_key.type) | |
2461 | goto next_type; | |
2462 | ||
2463 | if (found_key.offset > range_end) | |
2464 | break; | |
2465 | ||
2466 | ret = check_item_in_log(trans, root, log, path, | |
12fcfd22 CM |
2467 | log_path, dir, |
2468 | &found_key); | |
3650860b JB |
2469 | if (ret) |
2470 | goto out; | |
e02119d5 CM |
2471 | if (found_key.offset == (u64)-1) |
2472 | break; | |
2473 | dir_key.offset = found_key.offset + 1; | |
2474 | } | |
b3b4aa74 | 2475 | btrfs_release_path(path); |
e02119d5 CM |
2476 | if (range_end == (u64)-1) |
2477 | break; | |
2478 | range_start = range_end + 1; | |
2479 | } | |
2480 | ||
2481 | next_type: | |
2482 | ret = 0; | |
2483 | if (key_type == BTRFS_DIR_LOG_ITEM_KEY) { | |
2484 | key_type = BTRFS_DIR_LOG_INDEX_KEY; | |
2485 | dir_key.type = BTRFS_DIR_INDEX_KEY; | |
b3b4aa74 | 2486 | btrfs_release_path(path); |
e02119d5 CM |
2487 | goto again; |
2488 | } | |
2489 | out: | |
b3b4aa74 | 2490 | btrfs_release_path(path); |
e02119d5 CM |
2491 | btrfs_free_path(log_path); |
2492 | iput(dir); | |
2493 | return ret; | |
2494 | } | |
2495 | ||
2496 | /* | |
2497 | * the process_func used to replay items from the log tree. This | |
2498 | * gets called in two different stages. The first stage just looks | |
2499 | * for inodes and makes sure they are all copied into the subvolume. | |
2500 | * | |
2501 | * The second stage copies all the other item types from the log into | |
2502 | * the subvolume. The two stage approach is slower, but gets rid of | |
2503 | * lots of complexity around inodes referencing other inodes that exist | |
2504 | * only in the log (references come from either directory items or inode | |
2505 | * back refs). | |
2506 | */ | |
2507 | static int replay_one_buffer(struct btrfs_root *log, struct extent_buffer *eb, | |
581c1760 | 2508 | struct walk_control *wc, u64 gen, int level) |
e02119d5 CM |
2509 | { |
2510 | int nritems; | |
2511 | struct btrfs_path *path; | |
2512 | struct btrfs_root *root = wc->replay_dest; | |
2513 | struct btrfs_key key; | |
e02119d5 CM |
2514 | int i; |
2515 | int ret; | |
2516 | ||
581c1760 | 2517 | ret = btrfs_read_buffer(eb, gen, level, NULL); |
018642a1 TI |
2518 | if (ret) |
2519 | return ret; | |
e02119d5 CM |
2520 | |
2521 | level = btrfs_header_level(eb); | |
2522 | ||
2523 | if (level != 0) | |
2524 | return 0; | |
2525 | ||
2526 | path = btrfs_alloc_path(); | |
1e5063d0 MF |
2527 | if (!path) |
2528 | return -ENOMEM; | |
e02119d5 CM |
2529 | |
2530 | nritems = btrfs_header_nritems(eb); | |
2531 | for (i = 0; i < nritems; i++) { | |
2532 | btrfs_item_key_to_cpu(eb, &key, i); | |
e02119d5 CM |
2533 | |
2534 | /* inode keys are done during the first stage */ | |
2535 | if (key.type == BTRFS_INODE_ITEM_KEY && | |
2536 | wc->stage == LOG_WALK_REPLAY_INODES) { | |
e02119d5 CM |
2537 | struct btrfs_inode_item *inode_item; |
2538 | u32 mode; | |
2539 | ||
2540 | inode_item = btrfs_item_ptr(eb, i, | |
2541 | struct btrfs_inode_item); | |
f2d72f42 FM |
2542 | /* |
2543 | * If we have a tmpfile (O_TMPFILE) that got fsync'ed | |
2544 | * and never got linked before the fsync, skip it, as | |
2545 | * replaying it is pointless since it would be deleted | |
2546 | * later. We skip logging tmpfiles, but it's always | |
2547 | * possible we are replaying a log created with a kernel | |
2548 | * that used to log tmpfiles. | |
2549 | */ | |
2550 | if (btrfs_inode_nlink(eb, inode_item) == 0) { | |
2551 | wc->ignore_cur_inode = true; | |
2552 | continue; | |
2553 | } else { | |
2554 | wc->ignore_cur_inode = false; | |
2555 | } | |
4f764e51 FM |
2556 | ret = replay_xattr_deletes(wc->trans, root, log, |
2557 | path, key.objectid); | |
2558 | if (ret) | |
2559 | break; | |
e02119d5 CM |
2560 | mode = btrfs_inode_mode(eb, inode_item); |
2561 | if (S_ISDIR(mode)) { | |
2562 | ret = replay_dir_deletes(wc->trans, | |
12fcfd22 | 2563 | root, log, path, key.objectid, 0); |
b50c6e25 JB |
2564 | if (ret) |
2565 | break; | |
e02119d5 CM |
2566 | } |
2567 | ret = overwrite_item(wc->trans, root, path, | |
2568 | eb, i, &key); | |
b50c6e25 JB |
2569 | if (ret) |
2570 | break; | |
e02119d5 | 2571 | |
471d557a FM |
2572 | /* |
2573 | * Before replaying extents, truncate the inode to its | |
2574 | * size. We need to do it now and not after log replay | |
2575 | * because before an fsync we can have prealloc extents | |
2576 | * added beyond the inode's i_size. If we did it after, | |
2577 | * through orphan cleanup for example, we would drop | |
2578 | * those prealloc extents just after replaying them. | |
e02119d5 CM |
2579 | */ |
2580 | if (S_ISREG(mode)) { | |
5893dfb9 | 2581 | struct btrfs_drop_extents_args drop_args = { 0 }; |
471d557a FM |
2582 | struct inode *inode; |
2583 | u64 from; | |
2584 | ||
2585 | inode = read_one_inode(root, key.objectid); | |
2586 | if (!inode) { | |
2587 | ret = -EIO; | |
2588 | break; | |
2589 | } | |
2590 | from = ALIGN(i_size_read(inode), | |
2591 | root->fs_info->sectorsize); | |
5893dfb9 FM |
2592 | drop_args.start = from; |
2593 | drop_args.end = (u64)-1; | |
2594 | drop_args.drop_cache = true; | |
2595 | ret = btrfs_drop_extents(wc->trans, root, | |
2596 | BTRFS_I(inode), | |
2597 | &drop_args); | |
471d557a | 2598 | if (!ret) { |
2766ff61 FM |
2599 | inode_sub_bytes(inode, |
2600 | drop_args.bytes_found); | |
f2d72f42 | 2601 | /* Update the inode's nbytes. */ |
471d557a | 2602 | ret = btrfs_update_inode(wc->trans, |
9a56fcd1 | 2603 | root, BTRFS_I(inode)); |
471d557a FM |
2604 | } |
2605 | iput(inode); | |
b50c6e25 JB |
2606 | if (ret) |
2607 | break; | |
e02119d5 | 2608 | } |
c71bf099 | 2609 | |
e02119d5 CM |
2610 | ret = link_to_fixup_dir(wc->trans, root, |
2611 | path, key.objectid); | |
b50c6e25 JB |
2612 | if (ret) |
2613 | break; | |
e02119d5 | 2614 | } |
dd8e7217 | 2615 | |
f2d72f42 FM |
2616 | if (wc->ignore_cur_inode) |
2617 | continue; | |
2618 | ||
dd8e7217 JB |
2619 | if (key.type == BTRFS_DIR_INDEX_KEY && |
2620 | wc->stage == LOG_WALK_REPLAY_DIR_INDEX) { | |
2621 | ret = replay_one_dir_item(wc->trans, root, path, | |
2622 | eb, i, &key); | |
2623 | if (ret) | |
2624 | break; | |
2625 | } | |
2626 | ||
e02119d5 CM |
2627 | if (wc->stage < LOG_WALK_REPLAY_ALL) |
2628 | continue; | |
2629 | ||
2630 | /* these keys are simply copied */ | |
2631 | if (key.type == BTRFS_XATTR_ITEM_KEY) { | |
2632 | ret = overwrite_item(wc->trans, root, path, | |
2633 | eb, i, &key); | |
b50c6e25 JB |
2634 | if (ret) |
2635 | break; | |
2da1c669 LB |
2636 | } else if (key.type == BTRFS_INODE_REF_KEY || |
2637 | key.type == BTRFS_INODE_EXTREF_KEY) { | |
f186373f MF |
2638 | ret = add_inode_ref(wc->trans, root, log, path, |
2639 | eb, i, &key); | |
b50c6e25 JB |
2640 | if (ret && ret != -ENOENT) |
2641 | break; | |
2642 | ret = 0; | |
e02119d5 CM |
2643 | } else if (key.type == BTRFS_EXTENT_DATA_KEY) { |
2644 | ret = replay_one_extent(wc->trans, root, path, | |
2645 | eb, i, &key); | |
b50c6e25 JB |
2646 | if (ret) |
2647 | break; | |
dd8e7217 | 2648 | } else if (key.type == BTRFS_DIR_ITEM_KEY) { |
e02119d5 CM |
2649 | ret = replay_one_dir_item(wc->trans, root, path, |
2650 | eb, i, &key); | |
b50c6e25 JB |
2651 | if (ret) |
2652 | break; | |
e02119d5 CM |
2653 | } |
2654 | } | |
2655 | btrfs_free_path(path); | |
b50c6e25 | 2656 | return ret; |
e02119d5 CM |
2657 | } |
2658 | ||
6787bb9f NB |
2659 | /* |
2660 | * Correctly adjust the reserved bytes occupied by a log tree extent buffer | |
2661 | */ | |
2662 | static void unaccount_log_buffer(struct btrfs_fs_info *fs_info, u64 start) | |
2663 | { | |
2664 | struct btrfs_block_group *cache; | |
2665 | ||
2666 | cache = btrfs_lookup_block_group(fs_info, start); | |
2667 | if (!cache) { | |
2668 | btrfs_err(fs_info, "unable to find block group for %llu", start); | |
2669 | return; | |
2670 | } | |
2671 | ||
2672 | spin_lock(&cache->space_info->lock); | |
2673 | spin_lock(&cache->lock); | |
2674 | cache->reserved -= fs_info->nodesize; | |
2675 | cache->space_info->bytes_reserved -= fs_info->nodesize; | |
2676 | spin_unlock(&cache->lock); | |
2677 | spin_unlock(&cache->space_info->lock); | |
2678 | ||
2679 | btrfs_put_block_group(cache); | |
2680 | } | |
2681 | ||
d397712b | 2682 | static noinline int walk_down_log_tree(struct btrfs_trans_handle *trans, |
e02119d5 CM |
2683 | struct btrfs_root *root, |
2684 | struct btrfs_path *path, int *level, | |
2685 | struct walk_control *wc) | |
2686 | { | |
0b246afa | 2687 | struct btrfs_fs_info *fs_info = root->fs_info; |
e02119d5 CM |
2688 | u64 bytenr; |
2689 | u64 ptr_gen; | |
2690 | struct extent_buffer *next; | |
2691 | struct extent_buffer *cur; | |
e02119d5 CM |
2692 | u32 blocksize; |
2693 | int ret = 0; | |
2694 | ||
d397712b | 2695 | while (*level > 0) { |
581c1760 QW |
2696 | struct btrfs_key first_key; |
2697 | ||
e02119d5 CM |
2698 | cur = path->nodes[*level]; |
2699 | ||
fae7f21c | 2700 | WARN_ON(btrfs_header_level(cur) != *level); |
e02119d5 CM |
2701 | |
2702 | if (path->slots[*level] >= | |
2703 | btrfs_header_nritems(cur)) | |
2704 | break; | |
2705 | ||
2706 | bytenr = btrfs_node_blockptr(cur, path->slots[*level]); | |
2707 | ptr_gen = btrfs_node_ptr_generation(cur, path->slots[*level]); | |
581c1760 | 2708 | btrfs_node_key_to_cpu(cur, &first_key, path->slots[*level]); |
0b246afa | 2709 | blocksize = fs_info->nodesize; |
e02119d5 | 2710 | |
3fbaf258 JB |
2711 | next = btrfs_find_create_tree_block(fs_info, bytenr, |
2712 | btrfs_header_owner(cur), | |
2713 | *level - 1); | |
c871b0f2 LB |
2714 | if (IS_ERR(next)) |
2715 | return PTR_ERR(next); | |
e02119d5 | 2716 | |
e02119d5 | 2717 | if (*level == 1) { |
581c1760 QW |
2718 | ret = wc->process_func(root, next, wc, ptr_gen, |
2719 | *level - 1); | |
b50c6e25 JB |
2720 | if (ret) { |
2721 | free_extent_buffer(next); | |
1e5063d0 | 2722 | return ret; |
b50c6e25 | 2723 | } |
4a500fd1 | 2724 | |
e02119d5 CM |
2725 | path->slots[*level]++; |
2726 | if (wc->free) { | |
581c1760 QW |
2727 | ret = btrfs_read_buffer(next, ptr_gen, |
2728 | *level - 1, &first_key); | |
018642a1 TI |
2729 | if (ret) { |
2730 | free_extent_buffer(next); | |
2731 | return ret; | |
2732 | } | |
e02119d5 | 2733 | |
681ae509 JB |
2734 | if (trans) { |
2735 | btrfs_tree_lock(next); | |
6a884d7d | 2736 | btrfs_clean_tree_block(next); |
681ae509 JB |
2737 | btrfs_wait_tree_block_writeback(next); |
2738 | btrfs_tree_unlock(next); | |
7bfc1007 | 2739 | ret = btrfs_pin_reserved_extent(trans, |
10e958d5 NB |
2740 | bytenr, blocksize); |
2741 | if (ret) { | |
2742 | free_extent_buffer(next); | |
2743 | return ret; | |
2744 | } | |
1846430c LB |
2745 | } else { |
2746 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &next->bflags)) | |
2747 | clear_extent_buffer_dirty(next); | |
10e958d5 | 2748 | unaccount_log_buffer(fs_info, bytenr); |
3650860b | 2749 | } |
e02119d5 CM |
2750 | } |
2751 | free_extent_buffer(next); | |
2752 | continue; | |
2753 | } | |
581c1760 | 2754 | ret = btrfs_read_buffer(next, ptr_gen, *level - 1, &first_key); |
018642a1 TI |
2755 | if (ret) { |
2756 | free_extent_buffer(next); | |
2757 | return ret; | |
2758 | } | |
e02119d5 | 2759 | |
e02119d5 CM |
2760 | if (path->nodes[*level-1]) |
2761 | free_extent_buffer(path->nodes[*level-1]); | |
2762 | path->nodes[*level-1] = next; | |
2763 | *level = btrfs_header_level(next); | |
2764 | path->slots[*level] = 0; | |
2765 | cond_resched(); | |
2766 | } | |
4a500fd1 | 2767 | path->slots[*level] = btrfs_header_nritems(path->nodes[*level]); |
e02119d5 CM |
2768 | |
2769 | cond_resched(); | |
2770 | return 0; | |
2771 | } | |
2772 | ||
d397712b | 2773 | static noinline int walk_up_log_tree(struct btrfs_trans_handle *trans, |
e02119d5 CM |
2774 | struct btrfs_root *root, |
2775 | struct btrfs_path *path, int *level, | |
2776 | struct walk_control *wc) | |
2777 | { | |
0b246afa | 2778 | struct btrfs_fs_info *fs_info = root->fs_info; |
e02119d5 CM |
2779 | int i; |
2780 | int slot; | |
2781 | int ret; | |
2782 | ||
d397712b | 2783 | for (i = *level; i < BTRFS_MAX_LEVEL - 1 && path->nodes[i]; i++) { |
e02119d5 | 2784 | slot = path->slots[i]; |
4a500fd1 | 2785 | if (slot + 1 < btrfs_header_nritems(path->nodes[i])) { |
e02119d5 CM |
2786 | path->slots[i]++; |
2787 | *level = i; | |
2788 | WARN_ON(*level == 0); | |
2789 | return 0; | |
2790 | } else { | |
1e5063d0 | 2791 | ret = wc->process_func(root, path->nodes[*level], wc, |
581c1760 QW |
2792 | btrfs_header_generation(path->nodes[*level]), |
2793 | *level); | |
1e5063d0 MF |
2794 | if (ret) |
2795 | return ret; | |
2796 | ||
e02119d5 CM |
2797 | if (wc->free) { |
2798 | struct extent_buffer *next; | |
2799 | ||
2800 | next = path->nodes[*level]; | |
2801 | ||
681ae509 JB |
2802 | if (trans) { |
2803 | btrfs_tree_lock(next); | |
6a884d7d | 2804 | btrfs_clean_tree_block(next); |
681ae509 JB |
2805 | btrfs_wait_tree_block_writeback(next); |
2806 | btrfs_tree_unlock(next); | |
7bfc1007 | 2807 | ret = btrfs_pin_reserved_extent(trans, |
10e958d5 NB |
2808 | path->nodes[*level]->start, |
2809 | path->nodes[*level]->len); | |
2810 | if (ret) | |
2811 | return ret; | |
1846430c LB |
2812 | } else { |
2813 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &next->bflags)) | |
2814 | clear_extent_buffer_dirty(next); | |
e02119d5 | 2815 | |
10e958d5 NB |
2816 | unaccount_log_buffer(fs_info, |
2817 | path->nodes[*level]->start); | |
2818 | } | |
e02119d5 CM |
2819 | } |
2820 | free_extent_buffer(path->nodes[*level]); | |
2821 | path->nodes[*level] = NULL; | |
2822 | *level = i + 1; | |
2823 | } | |
2824 | } | |
2825 | return 1; | |
2826 | } | |
2827 | ||
2828 | /* | |
2829 | * drop the reference count on the tree rooted at 'snap'. This traverses | |
2830 | * the tree freeing any blocks that have a ref count of zero after being | |
2831 | * decremented. | |
2832 | */ | |
2833 | static int walk_log_tree(struct btrfs_trans_handle *trans, | |
2834 | struct btrfs_root *log, struct walk_control *wc) | |
2835 | { | |
2ff7e61e | 2836 | struct btrfs_fs_info *fs_info = log->fs_info; |
e02119d5 CM |
2837 | int ret = 0; |
2838 | int wret; | |
2839 | int level; | |
2840 | struct btrfs_path *path; | |
e02119d5 CM |
2841 | int orig_level; |
2842 | ||
2843 | path = btrfs_alloc_path(); | |
db5b493a TI |
2844 | if (!path) |
2845 | return -ENOMEM; | |
e02119d5 CM |
2846 | |
2847 | level = btrfs_header_level(log->node); | |
2848 | orig_level = level; | |
2849 | path->nodes[level] = log->node; | |
67439dad | 2850 | atomic_inc(&log->node->refs); |
e02119d5 CM |
2851 | path->slots[level] = 0; |
2852 | ||
d397712b | 2853 | while (1) { |
e02119d5 CM |
2854 | wret = walk_down_log_tree(trans, log, path, &level, wc); |
2855 | if (wret > 0) | |
2856 | break; | |
79787eaa | 2857 | if (wret < 0) { |
e02119d5 | 2858 | ret = wret; |
79787eaa JM |
2859 | goto out; |
2860 | } | |
e02119d5 CM |
2861 | |
2862 | wret = walk_up_log_tree(trans, log, path, &level, wc); | |
2863 | if (wret > 0) | |
2864 | break; | |
79787eaa | 2865 | if (wret < 0) { |
e02119d5 | 2866 | ret = wret; |
79787eaa JM |
2867 | goto out; |
2868 | } | |
e02119d5 CM |
2869 | } |
2870 | ||
2871 | /* was the root node processed? if not, catch it here */ | |
2872 | if (path->nodes[orig_level]) { | |
79787eaa | 2873 | ret = wc->process_func(log, path->nodes[orig_level], wc, |
581c1760 QW |
2874 | btrfs_header_generation(path->nodes[orig_level]), |
2875 | orig_level); | |
79787eaa JM |
2876 | if (ret) |
2877 | goto out; | |
e02119d5 CM |
2878 | if (wc->free) { |
2879 | struct extent_buffer *next; | |
2880 | ||
2881 | next = path->nodes[orig_level]; | |
2882 | ||
681ae509 JB |
2883 | if (trans) { |
2884 | btrfs_tree_lock(next); | |
6a884d7d | 2885 | btrfs_clean_tree_block(next); |
681ae509 JB |
2886 | btrfs_wait_tree_block_writeback(next); |
2887 | btrfs_tree_unlock(next); | |
7bfc1007 | 2888 | ret = btrfs_pin_reserved_extent(trans, |
10e958d5 NB |
2889 | next->start, next->len); |
2890 | if (ret) | |
2891 | goto out; | |
1846430c LB |
2892 | } else { |
2893 | if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &next->bflags)) | |
2894 | clear_extent_buffer_dirty(next); | |
10e958d5 | 2895 | unaccount_log_buffer(fs_info, next->start); |
681ae509 | 2896 | } |
e02119d5 CM |
2897 | } |
2898 | } | |
2899 | ||
79787eaa | 2900 | out: |
e02119d5 | 2901 | btrfs_free_path(path); |
e02119d5 CM |
2902 | return ret; |
2903 | } | |
2904 | ||
7237f183 YZ |
2905 | /* |
2906 | * helper function to update the item for a given subvolumes log root | |
2907 | * in the tree of log roots | |
2908 | */ | |
2909 | static int update_log_root(struct btrfs_trans_handle *trans, | |
4203e968 JB |
2910 | struct btrfs_root *log, |
2911 | struct btrfs_root_item *root_item) | |
7237f183 | 2912 | { |
0b246afa | 2913 | struct btrfs_fs_info *fs_info = log->fs_info; |
7237f183 YZ |
2914 | int ret; |
2915 | ||
2916 | if (log->log_transid == 1) { | |
2917 | /* insert root item on the first sync */ | |
0b246afa | 2918 | ret = btrfs_insert_root(trans, fs_info->log_root_tree, |
4203e968 | 2919 | &log->root_key, root_item); |
7237f183 | 2920 | } else { |
0b246afa | 2921 | ret = btrfs_update_root(trans, fs_info->log_root_tree, |
4203e968 | 2922 | &log->root_key, root_item); |
7237f183 YZ |
2923 | } |
2924 | return ret; | |
2925 | } | |
2926 | ||
60d53eb3 | 2927 | static void wait_log_commit(struct btrfs_root *root, int transid) |
e02119d5 CM |
2928 | { |
2929 | DEFINE_WAIT(wait); | |
7237f183 | 2930 | int index = transid % 2; |
e02119d5 | 2931 | |
7237f183 YZ |
2932 | /* |
2933 | * we only allow two pending log transactions at a time, | |
2934 | * so we know that if ours is more than 2 older than the | |
2935 | * current transaction, we're done | |
2936 | */ | |
49e83f57 | 2937 | for (;;) { |
7237f183 YZ |
2938 | prepare_to_wait(&root->log_commit_wait[index], |
2939 | &wait, TASK_UNINTERRUPTIBLE); | |
12fcfd22 | 2940 | |
49e83f57 LB |
2941 | if (!(root->log_transid_committed < transid && |
2942 | atomic_read(&root->log_commit[index]))) | |
2943 | break; | |
12fcfd22 | 2944 | |
49e83f57 LB |
2945 | mutex_unlock(&root->log_mutex); |
2946 | schedule(); | |
7237f183 | 2947 | mutex_lock(&root->log_mutex); |
49e83f57 LB |
2948 | } |
2949 | finish_wait(&root->log_commit_wait[index], &wait); | |
7237f183 YZ |
2950 | } |
2951 | ||
60d53eb3 | 2952 | static void wait_for_writer(struct btrfs_root *root) |
7237f183 YZ |
2953 | { |
2954 | DEFINE_WAIT(wait); | |
8b050d35 | 2955 | |
49e83f57 LB |
2956 | for (;;) { |
2957 | prepare_to_wait(&root->log_writer_wait, &wait, | |
2958 | TASK_UNINTERRUPTIBLE); | |
2959 | if (!atomic_read(&root->log_writers)) | |
2960 | break; | |
2961 | ||
7237f183 | 2962 | mutex_unlock(&root->log_mutex); |
49e83f57 | 2963 | schedule(); |
575849ec | 2964 | mutex_lock(&root->log_mutex); |
7237f183 | 2965 | } |
49e83f57 | 2966 | finish_wait(&root->log_writer_wait, &wait); |
e02119d5 CM |
2967 | } |
2968 | ||
8b050d35 MX |
2969 | static inline void btrfs_remove_log_ctx(struct btrfs_root *root, |
2970 | struct btrfs_log_ctx *ctx) | |
2971 | { | |
2972 | if (!ctx) | |
2973 | return; | |
2974 | ||
2975 | mutex_lock(&root->log_mutex); | |
2976 | list_del_init(&ctx->list); | |
2977 | mutex_unlock(&root->log_mutex); | |
2978 | } | |
2979 | ||
2980 | /* | |
2981 | * Invoked in log mutex context, or be sure there is no other task which | |
2982 | * can access the list. | |
2983 | */ | |
2984 | static inline void btrfs_remove_all_log_ctxs(struct btrfs_root *root, | |
2985 | int index, int error) | |
2986 | { | |
2987 | struct btrfs_log_ctx *ctx; | |
570dd450 | 2988 | struct btrfs_log_ctx *safe; |
8b050d35 | 2989 | |
570dd450 CM |
2990 | list_for_each_entry_safe(ctx, safe, &root->log_ctxs[index], list) { |
2991 | list_del_init(&ctx->list); | |
8b050d35 | 2992 | ctx->log_ret = error; |
570dd450 | 2993 | } |
8b050d35 MX |
2994 | |
2995 | INIT_LIST_HEAD(&root->log_ctxs[index]); | |
2996 | } | |
2997 | ||
e02119d5 CM |
2998 | /* |
2999 | * btrfs_sync_log does sends a given tree log down to the disk and | |
3000 | * updates the super blocks to record it. When this call is done, | |
12fcfd22 CM |
3001 | * you know that any inodes previously logged are safely on disk only |
3002 | * if it returns 0. | |
3003 | * | |
3004 | * Any other return value means you need to call btrfs_commit_transaction. | |
3005 | * Some of the edge cases for fsyncing directories that have had unlinks | |
3006 | * or renames done in the past mean that sometimes the only safe | |
3007 | * fsync is to commit the whole FS. When btrfs_sync_log returns -EAGAIN, | |
3008 | * that has happened. | |
e02119d5 CM |
3009 | */ |
3010 | int btrfs_sync_log(struct btrfs_trans_handle *trans, | |
8b050d35 | 3011 | struct btrfs_root *root, struct btrfs_log_ctx *ctx) |
e02119d5 | 3012 | { |
7237f183 YZ |
3013 | int index1; |
3014 | int index2; | |
8cef4e16 | 3015 | int mark; |
e02119d5 | 3016 | int ret; |
0b246afa | 3017 | struct btrfs_fs_info *fs_info = root->fs_info; |
e02119d5 | 3018 | struct btrfs_root *log = root->log_root; |
0b246afa | 3019 | struct btrfs_root *log_root_tree = fs_info->log_root_tree; |
4203e968 | 3020 | struct btrfs_root_item new_root_item; |
bb14a59b | 3021 | int log_transid = 0; |
8b050d35 | 3022 | struct btrfs_log_ctx root_log_ctx; |
c6adc9cc | 3023 | struct blk_plug plug; |
e02119d5 | 3024 | |
7237f183 | 3025 | mutex_lock(&root->log_mutex); |
d1433deb MX |
3026 | log_transid = ctx->log_transid; |
3027 | if (root->log_transid_committed >= log_transid) { | |
3028 | mutex_unlock(&root->log_mutex); | |
3029 | return ctx->log_ret; | |
3030 | } | |
3031 | ||
3032 | index1 = log_transid % 2; | |
7237f183 | 3033 | if (atomic_read(&root->log_commit[index1])) { |
60d53eb3 | 3034 | wait_log_commit(root, log_transid); |
7237f183 | 3035 | mutex_unlock(&root->log_mutex); |
8b050d35 | 3036 | return ctx->log_ret; |
e02119d5 | 3037 | } |
d1433deb | 3038 | ASSERT(log_transid == root->log_transid); |
7237f183 YZ |
3039 | atomic_set(&root->log_commit[index1], 1); |
3040 | ||
3041 | /* wait for previous tree log sync to complete */ | |
3042 | if (atomic_read(&root->log_commit[(index1 + 1) % 2])) | |
60d53eb3 | 3043 | wait_log_commit(root, log_transid - 1); |
48cab2e0 | 3044 | |
86df7eb9 | 3045 | while (1) { |
2ecb7923 | 3046 | int batch = atomic_read(&root->log_batch); |
cd354ad6 | 3047 | /* when we're on an ssd, just kick the log commit out */ |
0b246afa | 3048 | if (!btrfs_test_opt(fs_info, SSD) && |
27cdeb70 | 3049 | test_bit(BTRFS_ROOT_MULTI_LOG_TASKS, &root->state)) { |
86df7eb9 YZ |
3050 | mutex_unlock(&root->log_mutex); |
3051 | schedule_timeout_uninterruptible(1); | |
3052 | mutex_lock(&root->log_mutex); | |
3053 | } | |
60d53eb3 | 3054 | wait_for_writer(root); |
2ecb7923 | 3055 | if (batch == atomic_read(&root->log_batch)) |
e02119d5 CM |
3056 | break; |
3057 | } | |
e02119d5 | 3058 | |
12fcfd22 | 3059 | /* bail out if we need to do a full commit */ |
4884b8e8 | 3060 | if (btrfs_need_log_full_commit(trans)) { |
12fcfd22 CM |
3061 | ret = -EAGAIN; |
3062 | mutex_unlock(&root->log_mutex); | |
3063 | goto out; | |
3064 | } | |
3065 | ||
8cef4e16 YZ |
3066 | if (log_transid % 2 == 0) |
3067 | mark = EXTENT_DIRTY; | |
3068 | else | |
3069 | mark = EXTENT_NEW; | |
3070 | ||
690587d1 CM |
3071 | /* we start IO on all the marked extents here, but we don't actually |
3072 | * wait for them until later. | |
3073 | */ | |
c6adc9cc | 3074 | blk_start_plug(&plug); |
2ff7e61e | 3075 | ret = btrfs_write_marked_extents(fs_info, &log->dirty_log_pages, mark); |
79787eaa | 3076 | if (ret) { |
c6adc9cc | 3077 | blk_finish_plug(&plug); |
66642832 | 3078 | btrfs_abort_transaction(trans, ret); |
90787766 | 3079 | btrfs_set_log_full_commit(trans); |
79787eaa JM |
3080 | mutex_unlock(&root->log_mutex); |
3081 | goto out; | |
3082 | } | |
7237f183 | 3083 | |
4203e968 JB |
3084 | /* |
3085 | * We _must_ update under the root->log_mutex in order to make sure we | |
3086 | * have a consistent view of the log root we are trying to commit at | |
3087 | * this moment. | |
3088 | * | |
3089 | * We _must_ copy this into a local copy, because we are not holding the | |
3090 | * log_root_tree->log_mutex yet. This is important because when we | |
3091 | * commit the log_root_tree we must have a consistent view of the | |
3092 | * log_root_tree when we update the super block to point at the | |
3093 | * log_root_tree bytenr. If we update the log_root_tree here we'll race | |
3094 | * with the commit and possibly point at the new block which we may not | |
3095 | * have written out. | |
3096 | */ | |
5d4f98a2 | 3097 | btrfs_set_root_node(&log->root_item, log->node); |
4203e968 | 3098 | memcpy(&new_root_item, &log->root_item, sizeof(new_root_item)); |
7237f183 | 3099 | |
7237f183 YZ |
3100 | root->log_transid++; |
3101 | log->log_transid = root->log_transid; | |
ff782e0a | 3102 | root->log_start_pid = 0; |
7237f183 | 3103 | /* |
8cef4e16 YZ |
3104 | * IO has been started, blocks of the log tree have WRITTEN flag set |
3105 | * in their headers. new modifications of the log will be written to | |
3106 | * new positions. so it's safe to allow log writers to go in. | |
7237f183 YZ |
3107 | */ |
3108 | mutex_unlock(&root->log_mutex); | |
3109 | ||
28a23593 | 3110 | btrfs_init_log_ctx(&root_log_ctx, NULL); |
d1433deb | 3111 | |
7237f183 | 3112 | mutex_lock(&log_root_tree->log_mutex); |
d1433deb MX |
3113 | |
3114 | index2 = log_root_tree->log_transid % 2; | |
3115 | list_add_tail(&root_log_ctx.list, &log_root_tree->log_ctxs[index2]); | |
3116 | root_log_ctx.log_transid = log_root_tree->log_transid; | |
3117 | ||
4203e968 JB |
3118 | /* |
3119 | * Now we are safe to update the log_root_tree because we're under the | |
3120 | * log_mutex, and we're a current writer so we're holding the commit | |
3121 | * open until we drop the log_mutex. | |
3122 | */ | |
3123 | ret = update_log_root(trans, log, &new_root_item); | |
4a500fd1 | 3124 | if (ret) { |
d1433deb MX |
3125 | if (!list_empty(&root_log_ctx.list)) |
3126 | list_del_init(&root_log_ctx.list); | |
3127 | ||
c6adc9cc | 3128 | blk_finish_plug(&plug); |
90787766 | 3129 | btrfs_set_log_full_commit(trans); |
995946dd | 3130 | |
79787eaa | 3131 | if (ret != -ENOSPC) { |
66642832 | 3132 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
3133 | mutex_unlock(&log_root_tree->log_mutex); |
3134 | goto out; | |
3135 | } | |
bf89d38f | 3136 | btrfs_wait_tree_log_extents(log, mark); |
4a500fd1 YZ |
3137 | mutex_unlock(&log_root_tree->log_mutex); |
3138 | ret = -EAGAIN; | |
3139 | goto out; | |
3140 | } | |
3141 | ||
d1433deb | 3142 | if (log_root_tree->log_transid_committed >= root_log_ctx.log_transid) { |
3da5ab56 | 3143 | blk_finish_plug(&plug); |
cbd60aa7 | 3144 | list_del_init(&root_log_ctx.list); |
d1433deb MX |
3145 | mutex_unlock(&log_root_tree->log_mutex); |
3146 | ret = root_log_ctx.log_ret; | |
3147 | goto out; | |
3148 | } | |
8b050d35 | 3149 | |
d1433deb | 3150 | index2 = root_log_ctx.log_transid % 2; |
7237f183 | 3151 | if (atomic_read(&log_root_tree->log_commit[index2])) { |
c6adc9cc | 3152 | blk_finish_plug(&plug); |
bf89d38f | 3153 | ret = btrfs_wait_tree_log_extents(log, mark); |
60d53eb3 | 3154 | wait_log_commit(log_root_tree, |
d1433deb | 3155 | root_log_ctx.log_transid); |
7237f183 | 3156 | mutex_unlock(&log_root_tree->log_mutex); |
5ab5e44a FM |
3157 | if (!ret) |
3158 | ret = root_log_ctx.log_ret; | |
7237f183 YZ |
3159 | goto out; |
3160 | } | |
d1433deb | 3161 | ASSERT(root_log_ctx.log_transid == log_root_tree->log_transid); |
7237f183 YZ |
3162 | atomic_set(&log_root_tree->log_commit[index2], 1); |
3163 | ||
12fcfd22 | 3164 | if (atomic_read(&log_root_tree->log_commit[(index2 + 1) % 2])) { |
60d53eb3 | 3165 | wait_log_commit(log_root_tree, |
d1433deb | 3166 | root_log_ctx.log_transid - 1); |
12fcfd22 CM |
3167 | } |
3168 | ||
12fcfd22 CM |
3169 | /* |
3170 | * now that we've moved on to the tree of log tree roots, | |
3171 | * check the full commit flag again | |
3172 | */ | |
4884b8e8 | 3173 | if (btrfs_need_log_full_commit(trans)) { |
c6adc9cc | 3174 | blk_finish_plug(&plug); |
bf89d38f | 3175 | btrfs_wait_tree_log_extents(log, mark); |
12fcfd22 CM |
3176 | mutex_unlock(&log_root_tree->log_mutex); |
3177 | ret = -EAGAIN; | |
3178 | goto out_wake_log_root; | |
3179 | } | |
7237f183 | 3180 | |
2ff7e61e | 3181 | ret = btrfs_write_marked_extents(fs_info, |
c6adc9cc MX |
3182 | &log_root_tree->dirty_log_pages, |
3183 | EXTENT_DIRTY | EXTENT_NEW); | |
3184 | blk_finish_plug(&plug); | |
79787eaa | 3185 | if (ret) { |
90787766 | 3186 | btrfs_set_log_full_commit(trans); |
66642832 | 3187 | btrfs_abort_transaction(trans, ret); |
79787eaa JM |
3188 | mutex_unlock(&log_root_tree->log_mutex); |
3189 | goto out_wake_log_root; | |
3190 | } | |
bf89d38f | 3191 | ret = btrfs_wait_tree_log_extents(log, mark); |
5ab5e44a | 3192 | if (!ret) |
bf89d38f JM |
3193 | ret = btrfs_wait_tree_log_extents(log_root_tree, |
3194 | EXTENT_NEW | EXTENT_DIRTY); | |
5ab5e44a | 3195 | if (ret) { |
90787766 | 3196 | btrfs_set_log_full_commit(trans); |
5ab5e44a FM |
3197 | mutex_unlock(&log_root_tree->log_mutex); |
3198 | goto out_wake_log_root; | |
3199 | } | |
e02119d5 | 3200 | |
0b246afa JM |
3201 | btrfs_set_super_log_root(fs_info->super_for_commit, |
3202 | log_root_tree->node->start); | |
3203 | btrfs_set_super_log_root_level(fs_info->super_for_commit, | |
3204 | btrfs_header_level(log_root_tree->node)); | |
e02119d5 | 3205 | |
7237f183 | 3206 | log_root_tree->log_transid++; |
7237f183 YZ |
3207 | mutex_unlock(&log_root_tree->log_mutex); |
3208 | ||
3209 | /* | |
52042d8e | 3210 | * Nobody else is going to jump in and write the ctree |
7237f183 YZ |
3211 | * super here because the log_commit atomic below is protecting |
3212 | * us. We must be called with a transaction handle pinning | |
3213 | * the running transaction open, so a full commit can't hop | |
3214 | * in and cause problems either. | |
3215 | */ | |
eece6a9c | 3216 | ret = write_all_supers(fs_info, 1); |
5af3e8cc | 3217 | if (ret) { |
90787766 | 3218 | btrfs_set_log_full_commit(trans); |
66642832 | 3219 | btrfs_abort_transaction(trans, ret); |
5af3e8cc SB |
3220 | goto out_wake_log_root; |
3221 | } | |
7237f183 | 3222 | |
257c62e1 CM |
3223 | mutex_lock(&root->log_mutex); |
3224 | if (root->last_log_commit < log_transid) | |
3225 | root->last_log_commit = log_transid; | |
3226 | mutex_unlock(&root->log_mutex); | |
3227 | ||
12fcfd22 | 3228 | out_wake_log_root: |
570dd450 | 3229 | mutex_lock(&log_root_tree->log_mutex); |
8b050d35 MX |
3230 | btrfs_remove_all_log_ctxs(log_root_tree, index2, ret); |
3231 | ||
d1433deb | 3232 | log_root_tree->log_transid_committed++; |
7237f183 | 3233 | atomic_set(&log_root_tree->log_commit[index2], 0); |
d1433deb MX |
3234 | mutex_unlock(&log_root_tree->log_mutex); |
3235 | ||
33a9eca7 | 3236 | /* |
093258e6 DS |
3237 | * The barrier before waitqueue_active (in cond_wake_up) is needed so |
3238 | * all the updates above are seen by the woken threads. It might not be | |
3239 | * necessary, but proving that seems to be hard. | |
33a9eca7 | 3240 | */ |
093258e6 | 3241 | cond_wake_up(&log_root_tree->log_commit_wait[index2]); |
e02119d5 | 3242 | out: |
d1433deb | 3243 | mutex_lock(&root->log_mutex); |
570dd450 | 3244 | btrfs_remove_all_log_ctxs(root, index1, ret); |
d1433deb | 3245 | root->log_transid_committed++; |
7237f183 | 3246 | atomic_set(&root->log_commit[index1], 0); |
d1433deb | 3247 | mutex_unlock(&root->log_mutex); |
8b050d35 | 3248 | |
33a9eca7 | 3249 | /* |
093258e6 DS |
3250 | * The barrier before waitqueue_active (in cond_wake_up) is needed so |
3251 | * all the updates above are seen by the woken threads. It might not be | |
3252 | * necessary, but proving that seems to be hard. | |
33a9eca7 | 3253 | */ |
093258e6 | 3254 | cond_wake_up(&root->log_commit_wait[index1]); |
b31eabd8 | 3255 | return ret; |
e02119d5 CM |
3256 | } |
3257 | ||
4a500fd1 YZ |
3258 | static void free_log_tree(struct btrfs_trans_handle *trans, |
3259 | struct btrfs_root *log) | |
e02119d5 CM |
3260 | { |
3261 | int ret; | |
e02119d5 CM |
3262 | struct walk_control wc = { |
3263 | .free = 1, | |
3264 | .process_func = process_one_buffer | |
3265 | }; | |
3266 | ||
681ae509 | 3267 | ret = walk_log_tree(trans, log, &wc); |
374b0e2d JM |
3268 | if (ret) { |
3269 | if (trans) | |
3270 | btrfs_abort_transaction(trans, ret); | |
3271 | else | |
3272 | btrfs_handle_fs_error(log->fs_info, ret, NULL); | |
3273 | } | |
e02119d5 | 3274 | |
59b0713a FM |
3275 | clear_extent_bits(&log->dirty_log_pages, 0, (u64)-1, |
3276 | EXTENT_DIRTY | EXTENT_NEW | EXTENT_NEED_WAIT); | |
e289f03e | 3277 | extent_io_tree_release(&log->log_csum_range); |
00246528 | 3278 | btrfs_put_root(log); |
4a500fd1 YZ |
3279 | } |
3280 | ||
3281 | /* | |
3282 | * free all the extents used by the tree log. This should be called | |
3283 | * at commit time of the full transaction | |
3284 | */ | |
3285 | int btrfs_free_log(struct btrfs_trans_handle *trans, struct btrfs_root *root) | |
3286 | { | |
3287 | if (root->log_root) { | |
3288 | free_log_tree(trans, root->log_root); | |
3289 | root->log_root = NULL; | |
e7a79811 | 3290 | clear_bit(BTRFS_ROOT_HAS_LOG_TREE, &root->state); |
4a500fd1 YZ |
3291 | } |
3292 | return 0; | |
3293 | } | |
3294 | ||
3295 | int btrfs_free_log_root_tree(struct btrfs_trans_handle *trans, | |
3296 | struct btrfs_fs_info *fs_info) | |
3297 | { | |
3298 | if (fs_info->log_root_tree) { | |
3299 | free_log_tree(trans, fs_info->log_root_tree); | |
3300 | fs_info->log_root_tree = NULL; | |
3301 | } | |
e02119d5 CM |
3302 | return 0; |
3303 | } | |
3304 | ||
803f0f64 FM |
3305 | /* |
3306 | * Check if an inode was logged in the current transaction. We can't always rely | |
3307 | * on an inode's logged_trans value, because it's an in-memory only field and | |
3308 | * therefore not persisted. This means that its value is lost if the inode gets | |
3309 | * evicted and loaded again from disk (in which case it has a value of 0, and | |
3310 | * certainly it is smaller then any possible transaction ID), when that happens | |
3311 | * the full_sync flag is set in the inode's runtime flags, so on that case we | |
3312 | * assume eviction happened and ignore the logged_trans value, assuming the | |
3313 | * worst case, that the inode was logged before in the current transaction. | |
3314 | */ | |
3315 | static bool inode_logged(struct btrfs_trans_handle *trans, | |
3316 | struct btrfs_inode *inode) | |
3317 | { | |
3318 | if (inode->logged_trans == trans->transid) | |
3319 | return true; | |
3320 | ||
3321 | if (inode->last_trans == trans->transid && | |
3322 | test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags) && | |
3323 | !test_bit(BTRFS_FS_LOG_RECOVERING, &trans->fs_info->flags)) | |
3324 | return true; | |
3325 | ||
3326 | return false; | |
3327 | } | |
3328 | ||
e02119d5 CM |
3329 | /* |
3330 | * If both a file and directory are logged, and unlinks or renames are | |
3331 | * mixed in, we have a few interesting corners: | |
3332 | * | |
3333 | * create file X in dir Y | |
3334 | * link file X to X.link in dir Y | |
3335 | * fsync file X | |
3336 | * unlink file X but leave X.link | |
3337 | * fsync dir Y | |
3338 | * | |
3339 | * After a crash we would expect only X.link to exist. But file X | |
3340 | * didn't get fsync'd again so the log has back refs for X and X.link. | |
3341 | * | |
3342 | * We solve this by removing directory entries and inode backrefs from the | |
3343 | * log when a file that was logged in the current transaction is | |
3344 | * unlinked. Any later fsync will include the updated log entries, and | |
3345 | * we'll be able to reconstruct the proper directory items from backrefs. | |
3346 | * | |
3347 | * This optimizations allows us to avoid relogging the entire inode | |
3348 | * or the entire directory. | |
3349 | */ | |
3350 | int btrfs_del_dir_entries_in_log(struct btrfs_trans_handle *trans, | |
3351 | struct btrfs_root *root, | |
3352 | const char *name, int name_len, | |
49f34d1f | 3353 | struct btrfs_inode *dir, u64 index) |
e02119d5 CM |
3354 | { |
3355 | struct btrfs_root *log; | |
3356 | struct btrfs_dir_item *di; | |
3357 | struct btrfs_path *path; | |
3358 | int ret; | |
4a500fd1 | 3359 | int err = 0; |
e02119d5 | 3360 | int bytes_del = 0; |
49f34d1f | 3361 | u64 dir_ino = btrfs_ino(dir); |
e02119d5 | 3362 | |
803f0f64 | 3363 | if (!inode_logged(trans, dir)) |
3a5f1d45 CM |
3364 | return 0; |
3365 | ||
e02119d5 CM |
3366 | ret = join_running_log_trans(root); |
3367 | if (ret) | |
3368 | return 0; | |
3369 | ||
49f34d1f | 3370 | mutex_lock(&dir->log_mutex); |
e02119d5 CM |
3371 | |
3372 | log = root->log_root; | |
3373 | path = btrfs_alloc_path(); | |
a62f44a5 TI |
3374 | if (!path) { |
3375 | err = -ENOMEM; | |
3376 | goto out_unlock; | |
3377 | } | |
2a29edc6 | 3378 | |
33345d01 | 3379 | di = btrfs_lookup_dir_item(trans, log, path, dir_ino, |
e02119d5 | 3380 | name, name_len, -1); |
4a500fd1 YZ |
3381 | if (IS_ERR(di)) { |
3382 | err = PTR_ERR(di); | |
3383 | goto fail; | |
3384 | } | |
3385 | if (di) { | |
e02119d5 CM |
3386 | ret = btrfs_delete_one_dir_name(trans, log, path, di); |
3387 | bytes_del += name_len; | |
3650860b JB |
3388 | if (ret) { |
3389 | err = ret; | |
3390 | goto fail; | |
3391 | } | |
e02119d5 | 3392 | } |
b3b4aa74 | 3393 | btrfs_release_path(path); |
33345d01 | 3394 | di = btrfs_lookup_dir_index_item(trans, log, path, dir_ino, |
e02119d5 | 3395 | index, name, name_len, -1); |
4a500fd1 YZ |
3396 | if (IS_ERR(di)) { |
3397 | err = PTR_ERR(di); | |
3398 | goto fail; | |
3399 | } | |
3400 | if (di) { | |
e02119d5 CM |
3401 | ret = btrfs_delete_one_dir_name(trans, log, path, di); |
3402 | bytes_del += name_len; | |
3650860b JB |
3403 | if (ret) { |
3404 | err = ret; | |
3405 | goto fail; | |
3406 | } | |
e02119d5 CM |
3407 | } |
3408 | ||
3409 | /* update the directory size in the log to reflect the names | |
3410 | * we have removed | |
3411 | */ | |
3412 | if (bytes_del) { | |
3413 | struct btrfs_key key; | |
3414 | ||
33345d01 | 3415 | key.objectid = dir_ino; |
e02119d5 CM |
3416 | key.offset = 0; |
3417 | key.type = BTRFS_INODE_ITEM_KEY; | |
b3b4aa74 | 3418 | btrfs_release_path(path); |
e02119d5 CM |
3419 | |
3420 | ret = btrfs_search_slot(trans, log, &key, path, 0, 1); | |
4a500fd1 YZ |
3421 | if (ret < 0) { |
3422 | err = ret; | |
3423 | goto fail; | |
3424 | } | |
e02119d5 CM |
3425 | if (ret == 0) { |
3426 | struct btrfs_inode_item *item; | |
3427 | u64 i_size; | |
3428 | ||
3429 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3430 | struct btrfs_inode_item); | |
3431 | i_size = btrfs_inode_size(path->nodes[0], item); | |
3432 | if (i_size > bytes_del) | |
3433 | i_size -= bytes_del; | |
3434 | else | |
3435 | i_size = 0; | |
3436 | btrfs_set_inode_size(path->nodes[0], item, i_size); | |
3437 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
3438 | } else | |
3439 | ret = 0; | |
b3b4aa74 | 3440 | btrfs_release_path(path); |
e02119d5 | 3441 | } |
4a500fd1 | 3442 | fail: |
e02119d5 | 3443 | btrfs_free_path(path); |
a62f44a5 | 3444 | out_unlock: |
49f34d1f | 3445 | mutex_unlock(&dir->log_mutex); |
fb2fecba | 3446 | if (err == -ENOSPC) { |
90787766 | 3447 | btrfs_set_log_full_commit(trans); |
fb2fecba JB |
3448 | err = 0; |
3449 | } else if (err < 0 && err != -ENOENT) { | |
3450 | /* ENOENT can be returned if the entry hasn't been fsynced yet */ | |
3451 | btrfs_abort_transaction(trans, err); | |
3452 | } | |
79787eaa | 3453 | |
12fcfd22 | 3454 | btrfs_end_log_trans(root); |
e02119d5 | 3455 | |
411fc6bc | 3456 | return err; |
e02119d5 CM |
3457 | } |
3458 | ||
3459 | /* see comments for btrfs_del_dir_entries_in_log */ | |
3460 | int btrfs_del_inode_ref_in_log(struct btrfs_trans_handle *trans, | |
3461 | struct btrfs_root *root, | |
3462 | const char *name, int name_len, | |
a491abb2 | 3463 | struct btrfs_inode *inode, u64 dirid) |
e02119d5 CM |
3464 | { |
3465 | struct btrfs_root *log; | |
3466 | u64 index; | |
3467 | int ret; | |
3468 | ||
803f0f64 | 3469 | if (!inode_logged(trans, inode)) |
3a5f1d45 CM |
3470 | return 0; |
3471 | ||
e02119d5 CM |
3472 | ret = join_running_log_trans(root); |
3473 | if (ret) | |
3474 | return 0; | |
3475 | log = root->log_root; | |
a491abb2 | 3476 | mutex_lock(&inode->log_mutex); |
e02119d5 | 3477 | |
a491abb2 | 3478 | ret = btrfs_del_inode_ref(trans, log, name, name_len, btrfs_ino(inode), |
e02119d5 | 3479 | dirid, &index); |
a491abb2 | 3480 | mutex_unlock(&inode->log_mutex); |
4a500fd1 | 3481 | if (ret == -ENOSPC) { |
90787766 | 3482 | btrfs_set_log_full_commit(trans); |
4a500fd1 | 3483 | ret = 0; |
79787eaa | 3484 | } else if (ret < 0 && ret != -ENOENT) |
66642832 | 3485 | btrfs_abort_transaction(trans, ret); |
12fcfd22 | 3486 | btrfs_end_log_trans(root); |
e02119d5 | 3487 | |
e02119d5 CM |
3488 | return ret; |
3489 | } | |
3490 | ||
3491 | /* | |
3492 | * creates a range item in the log for 'dirid'. first_offset and | |
3493 | * last_offset tell us which parts of the key space the log should | |
3494 | * be considered authoritative for. | |
3495 | */ | |
3496 | static noinline int insert_dir_log_key(struct btrfs_trans_handle *trans, | |
3497 | struct btrfs_root *log, | |
3498 | struct btrfs_path *path, | |
3499 | int key_type, u64 dirid, | |
3500 | u64 first_offset, u64 last_offset) | |
3501 | { | |
3502 | int ret; | |
3503 | struct btrfs_key key; | |
3504 | struct btrfs_dir_log_item *item; | |
3505 | ||
3506 | key.objectid = dirid; | |
3507 | key.offset = first_offset; | |
3508 | if (key_type == BTRFS_DIR_ITEM_KEY) | |
3509 | key.type = BTRFS_DIR_LOG_ITEM_KEY; | |
3510 | else | |
3511 | key.type = BTRFS_DIR_LOG_INDEX_KEY; | |
3512 | ret = btrfs_insert_empty_item(trans, log, path, &key, sizeof(*item)); | |
4a500fd1 YZ |
3513 | if (ret) |
3514 | return ret; | |
e02119d5 CM |
3515 | |
3516 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3517 | struct btrfs_dir_log_item); | |
3518 | btrfs_set_dir_log_end(path->nodes[0], item, last_offset); | |
3519 | btrfs_mark_buffer_dirty(path->nodes[0]); | |
b3b4aa74 | 3520 | btrfs_release_path(path); |
e02119d5 CM |
3521 | return 0; |
3522 | } | |
3523 | ||
3524 | /* | |
3525 | * log all the items included in the current transaction for a given | |
3526 | * directory. This also creates the range items in the log tree required | |
3527 | * to replay anything deleted before the fsync | |
3528 | */ | |
3529 | static noinline int log_dir_items(struct btrfs_trans_handle *trans, | |
684a5773 | 3530 | struct btrfs_root *root, struct btrfs_inode *inode, |
e02119d5 CM |
3531 | struct btrfs_path *path, |
3532 | struct btrfs_path *dst_path, int key_type, | |
2f2ff0ee | 3533 | struct btrfs_log_ctx *ctx, |
e02119d5 CM |
3534 | u64 min_offset, u64 *last_offset_ret) |
3535 | { | |
3536 | struct btrfs_key min_key; | |
e02119d5 CM |
3537 | struct btrfs_root *log = root->log_root; |
3538 | struct extent_buffer *src; | |
4a500fd1 | 3539 | int err = 0; |
e02119d5 CM |
3540 | int ret; |
3541 | int i; | |
3542 | int nritems; | |
3543 | u64 first_offset = min_offset; | |
3544 | u64 last_offset = (u64)-1; | |
684a5773 | 3545 | u64 ino = btrfs_ino(inode); |
e02119d5 CM |
3546 | |
3547 | log = root->log_root; | |
e02119d5 | 3548 | |
33345d01 | 3549 | min_key.objectid = ino; |
e02119d5 CM |
3550 | min_key.type = key_type; |
3551 | min_key.offset = min_offset; | |
3552 | ||
6174d3cb | 3553 | ret = btrfs_search_forward(root, &min_key, path, trans->transid); |
e02119d5 CM |
3554 | |
3555 | /* | |
3556 | * we didn't find anything from this transaction, see if there | |
3557 | * is anything at all | |
3558 | */ | |
33345d01 LZ |
3559 | if (ret != 0 || min_key.objectid != ino || min_key.type != key_type) { |
3560 | min_key.objectid = ino; | |
e02119d5 CM |
3561 | min_key.type = key_type; |
3562 | min_key.offset = (u64)-1; | |
b3b4aa74 | 3563 | btrfs_release_path(path); |
e02119d5 CM |
3564 | ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0); |
3565 | if (ret < 0) { | |
b3b4aa74 | 3566 | btrfs_release_path(path); |
e02119d5 CM |
3567 | return ret; |
3568 | } | |
33345d01 | 3569 | ret = btrfs_previous_item(root, path, ino, key_type); |
e02119d5 CM |
3570 | |
3571 | /* if ret == 0 there are items for this type, | |
3572 | * create a range to tell us the last key of this type. | |
3573 | * otherwise, there are no items in this directory after | |
3574 | * *min_offset, and we create a range to indicate that. | |
3575 | */ | |
3576 | if (ret == 0) { | |
3577 | struct btrfs_key tmp; | |
3578 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, | |
3579 | path->slots[0]); | |
d397712b | 3580 | if (key_type == tmp.type) |
e02119d5 | 3581 | first_offset = max(min_offset, tmp.offset) + 1; |
e02119d5 CM |
3582 | } |
3583 | goto done; | |
3584 | } | |
3585 | ||
3586 | /* go backward to find any previous key */ | |
33345d01 | 3587 | ret = btrfs_previous_item(root, path, ino, key_type); |
e02119d5 CM |
3588 | if (ret == 0) { |
3589 | struct btrfs_key tmp; | |
3590 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); | |
3591 | if (key_type == tmp.type) { | |
3592 | first_offset = tmp.offset; | |
3593 | ret = overwrite_item(trans, log, dst_path, | |
3594 | path->nodes[0], path->slots[0], | |
3595 | &tmp); | |
4a500fd1 YZ |
3596 | if (ret) { |
3597 | err = ret; | |
3598 | goto done; | |
3599 | } | |
e02119d5 CM |
3600 | } |
3601 | } | |
b3b4aa74 | 3602 | btrfs_release_path(path); |
e02119d5 | 3603 | |
2cc83342 JB |
3604 | /* |
3605 | * Find the first key from this transaction again. See the note for | |
3606 | * log_new_dir_dentries, if we're logging a directory recursively we | |
3607 | * won't be holding its i_mutex, which means we can modify the directory | |
3608 | * while we're logging it. If we remove an entry between our first | |
3609 | * search and this search we'll not find the key again and can just | |
3610 | * bail. | |
3611 | */ | |
bb56f02f | 3612 | search: |
e02119d5 | 3613 | ret = btrfs_search_slot(NULL, root, &min_key, path, 0, 0); |
2cc83342 | 3614 | if (ret != 0) |
e02119d5 | 3615 | goto done; |
e02119d5 CM |
3616 | |
3617 | /* | |
3618 | * we have a block from this transaction, log every item in it | |
3619 | * from our directory | |
3620 | */ | |
d397712b | 3621 | while (1) { |
e02119d5 CM |
3622 | struct btrfs_key tmp; |
3623 | src = path->nodes[0]; | |
3624 | nritems = btrfs_header_nritems(src); | |
3625 | for (i = path->slots[0]; i < nritems; i++) { | |
2f2ff0ee FM |
3626 | struct btrfs_dir_item *di; |
3627 | ||
e02119d5 CM |
3628 | btrfs_item_key_to_cpu(src, &min_key, i); |
3629 | ||
33345d01 | 3630 | if (min_key.objectid != ino || min_key.type != key_type) |
e02119d5 | 3631 | goto done; |
bb56f02f FM |
3632 | |
3633 | if (need_resched()) { | |
3634 | btrfs_release_path(path); | |
3635 | cond_resched(); | |
3636 | goto search; | |
3637 | } | |
3638 | ||
e02119d5 CM |
3639 | ret = overwrite_item(trans, log, dst_path, src, i, |
3640 | &min_key); | |
4a500fd1 YZ |
3641 | if (ret) { |
3642 | err = ret; | |
3643 | goto done; | |
3644 | } | |
2f2ff0ee FM |
3645 | |
3646 | /* | |
3647 | * We must make sure that when we log a directory entry, | |
3648 | * the corresponding inode, after log replay, has a | |
3649 | * matching link count. For example: | |
3650 | * | |
3651 | * touch foo | |
3652 | * mkdir mydir | |
3653 | * sync | |
3654 | * ln foo mydir/bar | |
3655 | * xfs_io -c "fsync" mydir | |
3656 | * <crash> | |
3657 | * <mount fs and log replay> | |
3658 | * | |
3659 | * Would result in a fsync log that when replayed, our | |
3660 | * file inode would have a link count of 1, but we get | |
3661 | * two directory entries pointing to the same inode. | |
3662 | * After removing one of the names, it would not be | |
3663 | * possible to remove the other name, which resulted | |
3664 | * always in stale file handle errors, and would not | |
3665 | * be possible to rmdir the parent directory, since | |
3666 | * its i_size could never decrement to the value | |
3667 | * BTRFS_EMPTY_DIR_SIZE, resulting in -ENOTEMPTY errors. | |
3668 | */ | |
3669 | di = btrfs_item_ptr(src, i, struct btrfs_dir_item); | |
3670 | btrfs_dir_item_key_to_cpu(src, di, &tmp); | |
3671 | if (ctx && | |
3672 | (btrfs_dir_transid(src, di) == trans->transid || | |
3673 | btrfs_dir_type(src, di) == BTRFS_FT_DIR) && | |
3674 | tmp.type != BTRFS_ROOT_ITEM_KEY) | |
3675 | ctx->log_new_dentries = true; | |
e02119d5 CM |
3676 | } |
3677 | path->slots[0] = nritems; | |
3678 | ||
3679 | /* | |
3680 | * look ahead to the next item and see if it is also | |
3681 | * from this directory and from this transaction | |
3682 | */ | |
3683 | ret = btrfs_next_leaf(root, path); | |
80c0b421 LB |
3684 | if (ret) { |
3685 | if (ret == 1) | |
3686 | last_offset = (u64)-1; | |
3687 | else | |
3688 | err = ret; | |
e02119d5 CM |
3689 | goto done; |
3690 | } | |
3691 | btrfs_item_key_to_cpu(path->nodes[0], &tmp, path->slots[0]); | |
33345d01 | 3692 | if (tmp.objectid != ino || tmp.type != key_type) { |
e02119d5 CM |
3693 | last_offset = (u64)-1; |
3694 | goto done; | |
3695 | } | |
3696 | if (btrfs_header_generation(path->nodes[0]) != trans->transid) { | |
3697 | ret = overwrite_item(trans, log, dst_path, | |
3698 | path->nodes[0], path->slots[0], | |
3699 | &tmp); | |
4a500fd1 YZ |
3700 | if (ret) |
3701 | err = ret; | |
3702 | else | |
3703 | last_offset = tmp.offset; | |
e02119d5 CM |
3704 | goto done; |
3705 | } | |
3706 | } | |
3707 | done: | |
b3b4aa74 DS |
3708 | btrfs_release_path(path); |
3709 | btrfs_release_path(dst_path); | |
e02119d5 | 3710 | |
4a500fd1 YZ |
3711 | if (err == 0) { |
3712 | *last_offset_ret = last_offset; | |
3713 | /* | |
3714 | * insert the log range keys to indicate where the log | |
3715 | * is valid | |
3716 | */ | |
3717 | ret = insert_dir_log_key(trans, log, path, key_type, | |
33345d01 | 3718 | ino, first_offset, last_offset); |
4a500fd1 YZ |
3719 | if (ret) |
3720 | err = ret; | |
3721 | } | |
3722 | return err; | |
e02119d5 CM |
3723 | } |
3724 | ||
3725 | /* | |
3726 | * logging directories is very similar to logging inodes, We find all the items | |
3727 | * from the current transaction and write them to the log. | |
3728 | * | |
3729 | * The recovery code scans the directory in the subvolume, and if it finds a | |
3730 | * key in the range logged that is not present in the log tree, then it means | |
3731 | * that dir entry was unlinked during the transaction. | |
3732 | * | |
3733 | * In order for that scan to work, we must include one key smaller than | |
3734 | * the smallest logged by this transaction and one key larger than the largest | |
3735 | * key logged by this transaction. | |
3736 | */ | |
3737 | static noinline int log_directory_changes(struct btrfs_trans_handle *trans, | |
dbf39ea4 | 3738 | struct btrfs_root *root, struct btrfs_inode *inode, |
e02119d5 | 3739 | struct btrfs_path *path, |
2f2ff0ee FM |
3740 | struct btrfs_path *dst_path, |
3741 | struct btrfs_log_ctx *ctx) | |
e02119d5 CM |
3742 | { |
3743 | u64 min_key; | |
3744 | u64 max_key; | |
3745 | int ret; | |
3746 | int key_type = BTRFS_DIR_ITEM_KEY; | |
3747 | ||
3748 | again: | |
3749 | min_key = 0; | |
3750 | max_key = 0; | |
d397712b | 3751 | while (1) { |
dbf39ea4 NB |
3752 | ret = log_dir_items(trans, root, inode, path, dst_path, key_type, |
3753 | ctx, min_key, &max_key); | |
4a500fd1 YZ |
3754 | if (ret) |
3755 | return ret; | |
e02119d5 CM |
3756 | if (max_key == (u64)-1) |
3757 | break; | |
3758 | min_key = max_key + 1; | |
3759 | } | |
3760 | ||
3761 | if (key_type == BTRFS_DIR_ITEM_KEY) { | |
3762 | key_type = BTRFS_DIR_INDEX_KEY; | |
3763 | goto again; | |
3764 | } | |
3765 | return 0; | |
3766 | } | |
3767 | ||
3768 | /* | |
3769 | * a helper function to drop items from the log before we relog an | |
3770 | * inode. max_key_type indicates the highest item type to remove. | |
3771 | * This cannot be run for file data extents because it does not | |
3772 | * free the extents they point to. | |
3773 | */ | |
3774 | static int drop_objectid_items(struct btrfs_trans_handle *trans, | |
3775 | struct btrfs_root *log, | |
3776 | struct btrfs_path *path, | |
3777 | u64 objectid, int max_key_type) | |
3778 | { | |
3779 | int ret; | |
3780 | struct btrfs_key key; | |
3781 | struct btrfs_key found_key; | |
18ec90d6 | 3782 | int start_slot; |
e02119d5 CM |
3783 | |
3784 | key.objectid = objectid; | |
3785 | key.type = max_key_type; | |
3786 | key.offset = (u64)-1; | |
3787 | ||
d397712b | 3788 | while (1) { |
e02119d5 | 3789 | ret = btrfs_search_slot(trans, log, &key, path, -1, 1); |
3650860b | 3790 | BUG_ON(ret == 0); /* Logic error */ |
4a500fd1 | 3791 | if (ret < 0) |
e02119d5 CM |
3792 | break; |
3793 | ||
3794 | if (path->slots[0] == 0) | |
3795 | break; | |
3796 | ||
3797 | path->slots[0]--; | |
3798 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
3799 | path->slots[0]); | |
3800 | ||
3801 | if (found_key.objectid != objectid) | |
3802 | break; | |
3803 | ||
18ec90d6 JB |
3804 | found_key.offset = 0; |
3805 | found_key.type = 0; | |
e3b83361 | 3806 | ret = btrfs_bin_search(path->nodes[0], &found_key, &start_slot); |
cbca7d59 FM |
3807 | if (ret < 0) |
3808 | break; | |
18ec90d6 JB |
3809 | |
3810 | ret = btrfs_del_items(trans, log, path, start_slot, | |
3811 | path->slots[0] - start_slot + 1); | |
3812 | /* | |
3813 | * If start slot isn't 0 then we don't need to re-search, we've | |
3814 | * found the last guy with the objectid in this tree. | |
3815 | */ | |
3816 | if (ret || start_slot != 0) | |
65a246c5 | 3817 | break; |
b3b4aa74 | 3818 | btrfs_release_path(path); |
e02119d5 | 3819 | } |
b3b4aa74 | 3820 | btrfs_release_path(path); |
5bdbeb21 JB |
3821 | if (ret > 0) |
3822 | ret = 0; | |
4a500fd1 | 3823 | return ret; |
e02119d5 CM |
3824 | } |
3825 | ||
94edf4ae JB |
3826 | static void fill_inode_item(struct btrfs_trans_handle *trans, |
3827 | struct extent_buffer *leaf, | |
3828 | struct btrfs_inode_item *item, | |
1a4bcf47 FM |
3829 | struct inode *inode, int log_inode_only, |
3830 | u64 logged_isize) | |
94edf4ae | 3831 | { |
0b1c6cca JB |
3832 | struct btrfs_map_token token; |
3833 | ||
c82f823c | 3834 | btrfs_init_map_token(&token, leaf); |
94edf4ae JB |
3835 | |
3836 | if (log_inode_only) { | |
3837 | /* set the generation to zero so the recover code | |
3838 | * can tell the difference between an logging | |
3839 | * just to say 'this inode exists' and a logging | |
3840 | * to say 'update this inode with these values' | |
3841 | */ | |
cc4c13d5 DS |
3842 | btrfs_set_token_inode_generation(&token, item, 0); |
3843 | btrfs_set_token_inode_size(&token, item, logged_isize); | |
94edf4ae | 3844 | } else { |
cc4c13d5 DS |
3845 | btrfs_set_token_inode_generation(&token, item, |
3846 | BTRFS_I(inode)->generation); | |
3847 | btrfs_set_token_inode_size(&token, item, inode->i_size); | |
0b1c6cca JB |
3848 | } |
3849 | ||
cc4c13d5 DS |
3850 | btrfs_set_token_inode_uid(&token, item, i_uid_read(inode)); |
3851 | btrfs_set_token_inode_gid(&token, item, i_gid_read(inode)); | |
3852 | btrfs_set_token_inode_mode(&token, item, inode->i_mode); | |
3853 | btrfs_set_token_inode_nlink(&token, item, inode->i_nlink); | |
3854 | ||
3855 | btrfs_set_token_timespec_sec(&token, &item->atime, | |
3856 | inode->i_atime.tv_sec); | |
3857 | btrfs_set_token_timespec_nsec(&token, &item->atime, | |
3858 | inode->i_atime.tv_nsec); | |
3859 | ||
3860 | btrfs_set_token_timespec_sec(&token, &item->mtime, | |
3861 | inode->i_mtime.tv_sec); | |
3862 | btrfs_set_token_timespec_nsec(&token, &item->mtime, | |
3863 | inode->i_mtime.tv_nsec); | |
3864 | ||
3865 | btrfs_set_token_timespec_sec(&token, &item->ctime, | |
3866 | inode->i_ctime.tv_sec); | |
3867 | btrfs_set_token_timespec_nsec(&token, &item->ctime, | |
3868 | inode->i_ctime.tv_nsec); | |
3869 | ||
3870 | btrfs_set_token_inode_nbytes(&token, item, inode_get_bytes(inode)); | |
3871 | ||
3872 | btrfs_set_token_inode_sequence(&token, item, inode_peek_iversion(inode)); | |
3873 | btrfs_set_token_inode_transid(&token, item, trans->transid); | |
3874 | btrfs_set_token_inode_rdev(&token, item, inode->i_rdev); | |
3875 | btrfs_set_token_inode_flags(&token, item, BTRFS_I(inode)->flags); | |
3876 | btrfs_set_token_inode_block_group(&token, item, 0); | |
94edf4ae JB |
3877 | } |
3878 | ||
a95249b3 JB |
3879 | static int log_inode_item(struct btrfs_trans_handle *trans, |
3880 | struct btrfs_root *log, struct btrfs_path *path, | |
6d889a3b | 3881 | struct btrfs_inode *inode) |
a95249b3 JB |
3882 | { |
3883 | struct btrfs_inode_item *inode_item; | |
a95249b3 JB |
3884 | int ret; |
3885 | ||
efd0c405 | 3886 | ret = btrfs_insert_empty_item(trans, log, path, |
6d889a3b | 3887 | &inode->location, sizeof(*inode_item)); |
a95249b3 JB |
3888 | if (ret && ret != -EEXIST) |
3889 | return ret; | |
3890 | inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
3891 | struct btrfs_inode_item); | |
6d889a3b NB |
3892 | fill_inode_item(trans, path->nodes[0], inode_item, &inode->vfs_inode, |
3893 | 0, 0); | |
a95249b3 JB |
3894 | btrfs_release_path(path); |
3895 | return 0; | |
3896 | } | |
3897 | ||
40e046ac | 3898 | static int log_csums(struct btrfs_trans_handle *trans, |
3ebac17c | 3899 | struct btrfs_inode *inode, |
40e046ac FM |
3900 | struct btrfs_root *log_root, |
3901 | struct btrfs_ordered_sum *sums) | |
3902 | { | |
e289f03e FM |
3903 | const u64 lock_end = sums->bytenr + sums->len - 1; |
3904 | struct extent_state *cached_state = NULL; | |
40e046ac FM |
3905 | int ret; |
3906 | ||
3ebac17c FM |
3907 | /* |
3908 | * If this inode was not used for reflink operations in the current | |
3909 | * transaction with new extents, then do the fast path, no need to | |
3910 | * worry about logging checksum items with overlapping ranges. | |
3911 | */ | |
3912 | if (inode->last_reflink_trans < trans->transid) | |
3913 | return btrfs_csum_file_blocks(trans, log_root, sums); | |
3914 | ||
e289f03e FM |
3915 | /* |
3916 | * Serialize logging for checksums. This is to avoid racing with the | |
3917 | * same checksum being logged by another task that is logging another | |
3918 | * file which happens to refer to the same extent as well. Such races | |
3919 | * can leave checksum items in the log with overlapping ranges. | |
3920 | */ | |
3921 | ret = lock_extent_bits(&log_root->log_csum_range, sums->bytenr, | |
3922 | lock_end, &cached_state); | |
3923 | if (ret) | |
3924 | return ret; | |
40e046ac FM |
3925 | /* |
3926 | * Due to extent cloning, we might have logged a csum item that covers a | |
3927 | * subrange of a cloned extent, and later we can end up logging a csum | |
3928 | * item for a larger subrange of the same extent or the entire range. | |
3929 | * This would leave csum items in the log tree that cover the same range | |
3930 | * and break the searches for checksums in the log tree, resulting in | |
3931 | * some checksums missing in the fs/subvolume tree. So just delete (or | |
3932 | * trim and adjust) any existing csum items in the log for this range. | |
3933 | */ | |
3934 | ret = btrfs_del_csums(trans, log_root, sums->bytenr, sums->len); | |
e289f03e FM |
3935 | if (!ret) |
3936 | ret = btrfs_csum_file_blocks(trans, log_root, sums); | |
40e046ac | 3937 | |
e289f03e FM |
3938 | unlock_extent_cached(&log_root->log_csum_range, sums->bytenr, lock_end, |
3939 | &cached_state); | |
3940 | ||
3941 | return ret; | |
40e046ac FM |
3942 | } |
3943 | ||
31ff1cd2 | 3944 | static noinline int copy_items(struct btrfs_trans_handle *trans, |
44d70e19 | 3945 | struct btrfs_inode *inode, |
31ff1cd2 | 3946 | struct btrfs_path *dst_path, |
0e56315c | 3947 | struct btrfs_path *src_path, |
1a4bcf47 FM |
3948 | int start_slot, int nr, int inode_only, |
3949 | u64 logged_isize) | |
31ff1cd2 | 3950 | { |
3ffbd68c | 3951 | struct btrfs_fs_info *fs_info = trans->fs_info; |
31ff1cd2 CM |
3952 | unsigned long src_offset; |
3953 | unsigned long dst_offset; | |
44d70e19 | 3954 | struct btrfs_root *log = inode->root->log_root; |
31ff1cd2 CM |
3955 | struct btrfs_file_extent_item *extent; |
3956 | struct btrfs_inode_item *inode_item; | |
16e7549f | 3957 | struct extent_buffer *src = src_path->nodes[0]; |
31ff1cd2 CM |
3958 | int ret; |
3959 | struct btrfs_key *ins_keys; | |
3960 | u32 *ins_sizes; | |
3961 | char *ins_data; | |
3962 | int i; | |
d20f7043 | 3963 | struct list_head ordered_sums; |
44d70e19 | 3964 | int skip_csum = inode->flags & BTRFS_INODE_NODATASUM; |
d20f7043 CM |
3965 | |
3966 | INIT_LIST_HEAD(&ordered_sums); | |
31ff1cd2 CM |
3967 | |
3968 | ins_data = kmalloc(nr * sizeof(struct btrfs_key) + | |
3969 | nr * sizeof(u32), GFP_NOFS); | |
2a29edc6 | 3970 | if (!ins_data) |
3971 | return -ENOMEM; | |
3972 | ||
31ff1cd2 CM |
3973 | ins_sizes = (u32 *)ins_data; |
3974 | ins_keys = (struct btrfs_key *)(ins_data + nr * sizeof(u32)); | |
3975 | ||
3976 | for (i = 0; i < nr; i++) { | |
3977 | ins_sizes[i] = btrfs_item_size_nr(src, i + start_slot); | |
3978 | btrfs_item_key_to_cpu(src, ins_keys + i, i + start_slot); | |
3979 | } | |
3980 | ret = btrfs_insert_empty_items(trans, log, dst_path, | |
3981 | ins_keys, ins_sizes, nr); | |
4a500fd1 YZ |
3982 | if (ret) { |
3983 | kfree(ins_data); | |
3984 | return ret; | |
3985 | } | |
31ff1cd2 | 3986 | |
5d4f98a2 | 3987 | for (i = 0; i < nr; i++, dst_path->slots[0]++) { |
31ff1cd2 CM |
3988 | dst_offset = btrfs_item_ptr_offset(dst_path->nodes[0], |
3989 | dst_path->slots[0]); | |
3990 | ||
3991 | src_offset = btrfs_item_ptr_offset(src, start_slot + i); | |
3992 | ||
94edf4ae | 3993 | if (ins_keys[i].type == BTRFS_INODE_ITEM_KEY) { |
31ff1cd2 CM |
3994 | inode_item = btrfs_item_ptr(dst_path->nodes[0], |
3995 | dst_path->slots[0], | |
3996 | struct btrfs_inode_item); | |
94edf4ae | 3997 | fill_inode_item(trans, dst_path->nodes[0], inode_item, |
f85b7379 DS |
3998 | &inode->vfs_inode, |
3999 | inode_only == LOG_INODE_EXISTS, | |
1a4bcf47 | 4000 | logged_isize); |
94edf4ae JB |
4001 | } else { |
4002 | copy_extent_buffer(dst_path->nodes[0], src, dst_offset, | |
4003 | src_offset, ins_sizes[i]); | |
31ff1cd2 | 4004 | } |
94edf4ae | 4005 | |
31ff1cd2 CM |
4006 | /* take a reference on file data extents so that truncates |
4007 | * or deletes of this inode don't have to relog the inode | |
4008 | * again | |
4009 | */ | |
962a298f | 4010 | if (ins_keys[i].type == BTRFS_EXTENT_DATA_KEY && |
d2794405 | 4011 | !skip_csum) { |
31ff1cd2 CM |
4012 | int found_type; |
4013 | extent = btrfs_item_ptr(src, start_slot + i, | |
4014 | struct btrfs_file_extent_item); | |
4015 | ||
8e531cdf | 4016 | if (btrfs_file_extent_generation(src, extent) < trans->transid) |
4017 | continue; | |
4018 | ||
31ff1cd2 | 4019 | found_type = btrfs_file_extent_type(src, extent); |
6f1fed77 | 4020 | if (found_type == BTRFS_FILE_EXTENT_REG) { |
5d4f98a2 YZ |
4021 | u64 ds, dl, cs, cl; |
4022 | ds = btrfs_file_extent_disk_bytenr(src, | |
4023 | extent); | |
4024 | /* ds == 0 is a hole */ | |
4025 | if (ds == 0) | |
4026 | continue; | |
4027 | ||
4028 | dl = btrfs_file_extent_disk_num_bytes(src, | |
4029 | extent); | |
4030 | cs = btrfs_file_extent_offset(src, extent); | |
4031 | cl = btrfs_file_extent_num_bytes(src, | |
a419aef8 | 4032 | extent); |
580afd76 CM |
4033 | if (btrfs_file_extent_compression(src, |
4034 | extent)) { | |
4035 | cs = 0; | |
4036 | cl = dl; | |
4037 | } | |
5d4f98a2 YZ |
4038 | |
4039 | ret = btrfs_lookup_csums_range( | |
0b246afa | 4040 | fs_info->csum_root, |
5d4f98a2 | 4041 | ds + cs, ds + cs + cl - 1, |
a2de733c | 4042 | &ordered_sums, 0); |
4f26433e FM |
4043 | if (ret) |
4044 | break; | |
31ff1cd2 CM |
4045 | } |
4046 | } | |
31ff1cd2 CM |
4047 | } |
4048 | ||
4049 | btrfs_mark_buffer_dirty(dst_path->nodes[0]); | |
b3b4aa74 | 4050 | btrfs_release_path(dst_path); |
31ff1cd2 | 4051 | kfree(ins_data); |
d20f7043 CM |
4052 | |
4053 | /* | |
4054 | * we have to do this after the loop above to avoid changing the | |
4055 | * log tree while trying to change the log tree. | |
4056 | */ | |
d397712b | 4057 | while (!list_empty(&ordered_sums)) { |
d20f7043 CM |
4058 | struct btrfs_ordered_sum *sums = list_entry(ordered_sums.next, |
4059 | struct btrfs_ordered_sum, | |
4060 | list); | |
4a500fd1 | 4061 | if (!ret) |
3ebac17c | 4062 | ret = log_csums(trans, inode, log, sums); |
d20f7043 CM |
4063 | list_del(&sums->list); |
4064 | kfree(sums); | |
4065 | } | |
16e7549f | 4066 | |
4a500fd1 | 4067 | return ret; |
31ff1cd2 CM |
4068 | } |
4069 | ||
5dc562c5 JB |
4070 | static int extent_cmp(void *priv, struct list_head *a, struct list_head *b) |
4071 | { | |
4072 | struct extent_map *em1, *em2; | |
4073 | ||
4074 | em1 = list_entry(a, struct extent_map, list); | |
4075 | em2 = list_entry(b, struct extent_map, list); | |
4076 | ||
4077 | if (em1->start < em2->start) | |
4078 | return -1; | |
4079 | else if (em1->start > em2->start) | |
4080 | return 1; | |
4081 | return 0; | |
4082 | } | |
4083 | ||
e7175a69 JB |
4084 | static int log_extent_csums(struct btrfs_trans_handle *trans, |
4085 | struct btrfs_inode *inode, | |
a9ecb653 | 4086 | struct btrfs_root *log_root, |
48778179 FM |
4087 | const struct extent_map *em, |
4088 | struct btrfs_log_ctx *ctx) | |
5dc562c5 | 4089 | { |
48778179 | 4090 | struct btrfs_ordered_extent *ordered; |
2ab28f32 JB |
4091 | u64 csum_offset; |
4092 | u64 csum_len; | |
48778179 FM |
4093 | u64 mod_start = em->mod_start; |
4094 | u64 mod_len = em->mod_len; | |
8407f553 FM |
4095 | LIST_HEAD(ordered_sums); |
4096 | int ret = 0; | |
0aa4a17d | 4097 | |
e7175a69 JB |
4098 | if (inode->flags & BTRFS_INODE_NODATASUM || |
4099 | test_bit(EXTENT_FLAG_PREALLOC, &em->flags) || | |
8407f553 | 4100 | em->block_start == EXTENT_MAP_HOLE) |
70c8a91c | 4101 | return 0; |
5dc562c5 | 4102 | |
48778179 FM |
4103 | list_for_each_entry(ordered, &ctx->ordered_extents, log_list) { |
4104 | const u64 ordered_end = ordered->file_offset + ordered->num_bytes; | |
4105 | const u64 mod_end = mod_start + mod_len; | |
4106 | struct btrfs_ordered_sum *sums; | |
4107 | ||
4108 | if (mod_len == 0) | |
4109 | break; | |
4110 | ||
4111 | if (ordered_end <= mod_start) | |
4112 | continue; | |
4113 | if (mod_end <= ordered->file_offset) | |
4114 | break; | |
4115 | ||
4116 | /* | |
4117 | * We are going to copy all the csums on this ordered extent, so | |
4118 | * go ahead and adjust mod_start and mod_len in case this ordered | |
4119 | * extent has already been logged. | |
4120 | */ | |
4121 | if (ordered->file_offset > mod_start) { | |
4122 | if (ordered_end >= mod_end) | |
4123 | mod_len = ordered->file_offset - mod_start; | |
4124 | /* | |
4125 | * If we have this case | |
4126 | * | |
4127 | * |--------- logged extent ---------| | |
4128 | * |----- ordered extent ----| | |
4129 | * | |
4130 | * Just don't mess with mod_start and mod_len, we'll | |
4131 | * just end up logging more csums than we need and it | |
4132 | * will be ok. | |
4133 | */ | |
4134 | } else { | |
4135 | if (ordered_end < mod_end) { | |
4136 | mod_len = mod_end - ordered_end; | |
4137 | mod_start = ordered_end; | |
4138 | } else { | |
4139 | mod_len = 0; | |
4140 | } | |
4141 | } | |
4142 | ||
4143 | /* | |
4144 | * To keep us from looping for the above case of an ordered | |
4145 | * extent that falls inside of the logged extent. | |
4146 | */ | |
4147 | if (test_and_set_bit(BTRFS_ORDERED_LOGGED_CSUM, &ordered->flags)) | |
4148 | continue; | |
4149 | ||
4150 | list_for_each_entry(sums, &ordered->list, list) { | |
4151 | ret = log_csums(trans, inode, log_root, sums); | |
4152 | if (ret) | |
4153 | return ret; | |
4154 | } | |
4155 | } | |
4156 | ||
4157 | /* We're done, found all csums in the ordered extents. */ | |
4158 | if (mod_len == 0) | |
4159 | return 0; | |
4160 | ||
e7175a69 | 4161 | /* If we're compressed we have to save the entire range of csums. */ |
488111aa FDBM |
4162 | if (em->compress_type) { |
4163 | csum_offset = 0; | |
8407f553 | 4164 | csum_len = max(em->block_len, em->orig_block_len); |
488111aa | 4165 | } else { |
48778179 FM |
4166 | csum_offset = mod_start - em->start; |
4167 | csum_len = mod_len; | |
488111aa | 4168 | } |
2ab28f32 | 4169 | |
70c8a91c | 4170 | /* block start is already adjusted for the file extent offset. */ |
a9ecb653 | 4171 | ret = btrfs_lookup_csums_range(trans->fs_info->csum_root, |
70c8a91c JB |
4172 | em->block_start + csum_offset, |
4173 | em->block_start + csum_offset + | |
4174 | csum_len - 1, &ordered_sums, 0); | |
4175 | if (ret) | |
4176 | return ret; | |
5dc562c5 | 4177 | |
70c8a91c JB |
4178 | while (!list_empty(&ordered_sums)) { |
4179 | struct btrfs_ordered_sum *sums = list_entry(ordered_sums.next, | |
4180 | struct btrfs_ordered_sum, | |
4181 | list); | |
4182 | if (!ret) | |
3ebac17c | 4183 | ret = log_csums(trans, inode, log_root, sums); |
70c8a91c JB |
4184 | list_del(&sums->list); |
4185 | kfree(sums); | |
5dc562c5 JB |
4186 | } |
4187 | ||
70c8a91c | 4188 | return ret; |
5dc562c5 JB |
4189 | } |
4190 | ||
8407f553 | 4191 | static int log_one_extent(struct btrfs_trans_handle *trans, |
9d122629 | 4192 | struct btrfs_inode *inode, struct btrfs_root *root, |
8407f553 FM |
4193 | const struct extent_map *em, |
4194 | struct btrfs_path *path, | |
8407f553 FM |
4195 | struct btrfs_log_ctx *ctx) |
4196 | { | |
5893dfb9 | 4197 | struct btrfs_drop_extents_args drop_args = { 0 }; |
8407f553 FM |
4198 | struct btrfs_root *log = root->log_root; |
4199 | struct btrfs_file_extent_item *fi; | |
4200 | struct extent_buffer *leaf; | |
4201 | struct btrfs_map_token token; | |
4202 | struct btrfs_key key; | |
4203 | u64 extent_offset = em->start - em->orig_start; | |
4204 | u64 block_len; | |
4205 | int ret; | |
8407f553 | 4206 | |
48778179 | 4207 | ret = log_extent_csums(trans, inode, log, em, ctx); |
8407f553 FM |
4208 | if (ret) |
4209 | return ret; | |
4210 | ||
5893dfb9 FM |
4211 | drop_args.path = path; |
4212 | drop_args.start = em->start; | |
4213 | drop_args.end = em->start + em->len; | |
4214 | drop_args.replace_extent = true; | |
4215 | drop_args.extent_item_size = sizeof(*fi); | |
4216 | ret = btrfs_drop_extents(trans, log, inode, &drop_args); | |
8407f553 FM |
4217 | if (ret) |
4218 | return ret; | |
4219 | ||
5893dfb9 | 4220 | if (!drop_args.extent_inserted) { |
9d122629 | 4221 | key.objectid = btrfs_ino(inode); |
8407f553 FM |
4222 | key.type = BTRFS_EXTENT_DATA_KEY; |
4223 | key.offset = em->start; | |
4224 | ||
4225 | ret = btrfs_insert_empty_item(trans, log, path, &key, | |
4226 | sizeof(*fi)); | |
4227 | if (ret) | |
4228 | return ret; | |
4229 | } | |
4230 | leaf = path->nodes[0]; | |
c82f823c | 4231 | btrfs_init_map_token(&token, leaf); |
8407f553 FM |
4232 | fi = btrfs_item_ptr(leaf, path->slots[0], |
4233 | struct btrfs_file_extent_item); | |
4234 | ||
cc4c13d5 | 4235 | btrfs_set_token_file_extent_generation(&token, fi, trans->transid); |
8407f553 | 4236 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) |
cc4c13d5 DS |
4237 | btrfs_set_token_file_extent_type(&token, fi, |
4238 | BTRFS_FILE_EXTENT_PREALLOC); | |
8407f553 | 4239 | else |
cc4c13d5 DS |
4240 | btrfs_set_token_file_extent_type(&token, fi, |
4241 | BTRFS_FILE_EXTENT_REG); | |
8407f553 FM |
4242 | |
4243 | block_len = max(em->block_len, em->orig_block_len); | |
4244 | if (em->compress_type != BTRFS_COMPRESS_NONE) { | |
cc4c13d5 DS |
4245 | btrfs_set_token_file_extent_disk_bytenr(&token, fi, |
4246 | em->block_start); | |
4247 | btrfs_set_token_file_extent_disk_num_bytes(&token, fi, block_len); | |
8407f553 | 4248 | } else if (em->block_start < EXTENT_MAP_LAST_BYTE) { |
cc4c13d5 | 4249 | btrfs_set_token_file_extent_disk_bytenr(&token, fi, |
8407f553 | 4250 | em->block_start - |
cc4c13d5 DS |
4251 | extent_offset); |
4252 | btrfs_set_token_file_extent_disk_num_bytes(&token, fi, block_len); | |
8407f553 | 4253 | } else { |
cc4c13d5 DS |
4254 | btrfs_set_token_file_extent_disk_bytenr(&token, fi, 0); |
4255 | btrfs_set_token_file_extent_disk_num_bytes(&token, fi, 0); | |
8407f553 FM |
4256 | } |
4257 | ||
cc4c13d5 DS |
4258 | btrfs_set_token_file_extent_offset(&token, fi, extent_offset); |
4259 | btrfs_set_token_file_extent_num_bytes(&token, fi, em->len); | |
4260 | btrfs_set_token_file_extent_ram_bytes(&token, fi, em->ram_bytes); | |
4261 | btrfs_set_token_file_extent_compression(&token, fi, em->compress_type); | |
4262 | btrfs_set_token_file_extent_encryption(&token, fi, 0); | |
4263 | btrfs_set_token_file_extent_other_encoding(&token, fi, 0); | |
8407f553 FM |
4264 | btrfs_mark_buffer_dirty(leaf); |
4265 | ||
4266 | btrfs_release_path(path); | |
4267 | ||
4268 | return ret; | |
4269 | } | |
4270 | ||
31d11b83 FM |
4271 | /* |
4272 | * Log all prealloc extents beyond the inode's i_size to make sure we do not | |
4273 | * lose them after doing a fast fsync and replaying the log. We scan the | |
4274 | * subvolume's root instead of iterating the inode's extent map tree because | |
4275 | * otherwise we can log incorrect extent items based on extent map conversion. | |
4276 | * That can happen due to the fact that extent maps are merged when they | |
4277 | * are not in the extent map tree's list of modified extents. | |
4278 | */ | |
4279 | static int btrfs_log_prealloc_extents(struct btrfs_trans_handle *trans, | |
4280 | struct btrfs_inode *inode, | |
4281 | struct btrfs_path *path) | |
4282 | { | |
4283 | struct btrfs_root *root = inode->root; | |
4284 | struct btrfs_key key; | |
4285 | const u64 i_size = i_size_read(&inode->vfs_inode); | |
4286 | const u64 ino = btrfs_ino(inode); | |
4287 | struct btrfs_path *dst_path = NULL; | |
0e56315c | 4288 | bool dropped_extents = false; |
f135cea3 FM |
4289 | u64 truncate_offset = i_size; |
4290 | struct extent_buffer *leaf; | |
4291 | int slot; | |
31d11b83 FM |
4292 | int ins_nr = 0; |
4293 | int start_slot; | |
4294 | int ret; | |
4295 | ||
4296 | if (!(inode->flags & BTRFS_INODE_PREALLOC)) | |
4297 | return 0; | |
4298 | ||
4299 | key.objectid = ino; | |
4300 | key.type = BTRFS_EXTENT_DATA_KEY; | |
4301 | key.offset = i_size; | |
4302 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
4303 | if (ret < 0) | |
4304 | goto out; | |
4305 | ||
f135cea3 FM |
4306 | /* |
4307 | * We must check if there is a prealloc extent that starts before the | |
4308 | * i_size and crosses the i_size boundary. This is to ensure later we | |
4309 | * truncate down to the end of that extent and not to the i_size, as | |
4310 | * otherwise we end up losing part of the prealloc extent after a log | |
4311 | * replay and with an implicit hole if there is another prealloc extent | |
4312 | * that starts at an offset beyond i_size. | |
4313 | */ | |
4314 | ret = btrfs_previous_item(root, path, ino, BTRFS_EXTENT_DATA_KEY); | |
4315 | if (ret < 0) | |
4316 | goto out; | |
4317 | ||
4318 | if (ret == 0) { | |
4319 | struct btrfs_file_extent_item *ei; | |
4320 | ||
4321 | leaf = path->nodes[0]; | |
4322 | slot = path->slots[0]; | |
4323 | ei = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item); | |
4324 | ||
4325 | if (btrfs_file_extent_type(leaf, ei) == | |
4326 | BTRFS_FILE_EXTENT_PREALLOC) { | |
4327 | u64 extent_end; | |
4328 | ||
4329 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
4330 | extent_end = key.offset + | |
4331 | btrfs_file_extent_num_bytes(leaf, ei); | |
4332 | ||
4333 | if (extent_end > i_size) | |
4334 | truncate_offset = extent_end; | |
4335 | } | |
4336 | } else { | |
4337 | ret = 0; | |
4338 | } | |
4339 | ||
31d11b83 | 4340 | while (true) { |
f135cea3 FM |
4341 | leaf = path->nodes[0]; |
4342 | slot = path->slots[0]; | |
31d11b83 FM |
4343 | |
4344 | if (slot >= btrfs_header_nritems(leaf)) { | |
4345 | if (ins_nr > 0) { | |
4346 | ret = copy_items(trans, inode, dst_path, path, | |
0e56315c | 4347 | start_slot, ins_nr, 1, 0); |
31d11b83 FM |
4348 | if (ret < 0) |
4349 | goto out; | |
4350 | ins_nr = 0; | |
4351 | } | |
4352 | ret = btrfs_next_leaf(root, path); | |
4353 | if (ret < 0) | |
4354 | goto out; | |
4355 | if (ret > 0) { | |
4356 | ret = 0; | |
4357 | break; | |
4358 | } | |
4359 | continue; | |
4360 | } | |
4361 | ||
4362 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
4363 | if (key.objectid > ino) | |
4364 | break; | |
4365 | if (WARN_ON_ONCE(key.objectid < ino) || | |
4366 | key.type < BTRFS_EXTENT_DATA_KEY || | |
4367 | key.offset < i_size) { | |
4368 | path->slots[0]++; | |
4369 | continue; | |
4370 | } | |
0e56315c | 4371 | if (!dropped_extents) { |
31d11b83 FM |
4372 | /* |
4373 | * Avoid logging extent items logged in past fsync calls | |
4374 | * and leading to duplicate keys in the log tree. | |
4375 | */ | |
4376 | do { | |
4377 | ret = btrfs_truncate_inode_items(trans, | |
4378 | root->log_root, | |
50743398 | 4379 | inode, truncate_offset, |
31d11b83 FM |
4380 | BTRFS_EXTENT_DATA_KEY); |
4381 | } while (ret == -EAGAIN); | |
4382 | if (ret) | |
4383 | goto out; | |
0e56315c | 4384 | dropped_extents = true; |
31d11b83 FM |
4385 | } |
4386 | if (ins_nr == 0) | |
4387 | start_slot = slot; | |
4388 | ins_nr++; | |
4389 | path->slots[0]++; | |
4390 | if (!dst_path) { | |
4391 | dst_path = btrfs_alloc_path(); | |
4392 | if (!dst_path) { | |
4393 | ret = -ENOMEM; | |
4394 | goto out; | |
4395 | } | |
4396 | } | |
4397 | } | |
0bc2d3c0 | 4398 | if (ins_nr > 0) |
0e56315c | 4399 | ret = copy_items(trans, inode, dst_path, path, |
31d11b83 | 4400 | start_slot, ins_nr, 1, 0); |
31d11b83 FM |
4401 | out: |
4402 | btrfs_release_path(path); | |
4403 | btrfs_free_path(dst_path); | |
4404 | return ret; | |
4405 | } | |
4406 | ||
5dc562c5 JB |
4407 | static int btrfs_log_changed_extents(struct btrfs_trans_handle *trans, |
4408 | struct btrfs_root *root, | |
9d122629 | 4409 | struct btrfs_inode *inode, |
827463c4 | 4410 | struct btrfs_path *path, |
48778179 | 4411 | struct btrfs_log_ctx *ctx) |
5dc562c5 | 4412 | { |
48778179 FM |
4413 | struct btrfs_ordered_extent *ordered; |
4414 | struct btrfs_ordered_extent *tmp; | |
5dc562c5 JB |
4415 | struct extent_map *em, *n; |
4416 | struct list_head extents; | |
9d122629 | 4417 | struct extent_map_tree *tree = &inode->extent_tree; |
5dc562c5 | 4418 | int ret = 0; |
2ab28f32 | 4419 | int num = 0; |
5dc562c5 JB |
4420 | |
4421 | INIT_LIST_HEAD(&extents); | |
4422 | ||
5dc562c5 | 4423 | write_lock(&tree->lock); |
5dc562c5 JB |
4424 | |
4425 | list_for_each_entry_safe(em, n, &tree->modified_extents, list) { | |
4426 | list_del_init(&em->list); | |
2ab28f32 JB |
4427 | /* |
4428 | * Just an arbitrary number, this can be really CPU intensive | |
4429 | * once we start getting a lot of extents, and really once we | |
4430 | * have a bunch of extents we just want to commit since it will | |
4431 | * be faster. | |
4432 | */ | |
4433 | if (++num > 32768) { | |
4434 | list_del_init(&tree->modified_extents); | |
4435 | ret = -EFBIG; | |
4436 | goto process; | |
4437 | } | |
4438 | ||
5f96bfb7 | 4439 | if (em->generation < trans->transid) |
5dc562c5 | 4440 | continue; |
8c6c5928 | 4441 | |
31d11b83 FM |
4442 | /* We log prealloc extents beyond eof later. */ |
4443 | if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) && | |
4444 | em->start >= i_size_read(&inode->vfs_inode)) | |
4445 | continue; | |
4446 | ||
ff44c6e3 | 4447 | /* Need a ref to keep it from getting evicted from cache */ |
490b54d6 | 4448 | refcount_inc(&em->refs); |
ff44c6e3 | 4449 | set_bit(EXTENT_FLAG_LOGGING, &em->flags); |
5dc562c5 | 4450 | list_add_tail(&em->list, &extents); |
2ab28f32 | 4451 | num++; |
5dc562c5 JB |
4452 | } |
4453 | ||
4454 | list_sort(NULL, &extents, extent_cmp); | |
2ab28f32 | 4455 | process: |
5dc562c5 JB |
4456 | while (!list_empty(&extents)) { |
4457 | em = list_entry(extents.next, struct extent_map, list); | |
4458 | ||
4459 | list_del_init(&em->list); | |
4460 | ||
4461 | /* | |
4462 | * If we had an error we just need to delete everybody from our | |
4463 | * private list. | |
4464 | */ | |
ff44c6e3 | 4465 | if (ret) { |
201a9038 | 4466 | clear_em_logging(tree, em); |
ff44c6e3 | 4467 | free_extent_map(em); |
5dc562c5 | 4468 | continue; |
ff44c6e3 JB |
4469 | } |
4470 | ||
4471 | write_unlock(&tree->lock); | |
5dc562c5 | 4472 | |
a2120a47 | 4473 | ret = log_one_extent(trans, inode, root, em, path, ctx); |
ff44c6e3 | 4474 | write_lock(&tree->lock); |
201a9038 JB |
4475 | clear_em_logging(tree, em); |
4476 | free_extent_map(em); | |
5dc562c5 | 4477 | } |
ff44c6e3 JB |
4478 | WARN_ON(!list_empty(&extents)); |
4479 | write_unlock(&tree->lock); | |
5dc562c5 | 4480 | |
5dc562c5 | 4481 | btrfs_release_path(path); |
31d11b83 FM |
4482 | if (!ret) |
4483 | ret = btrfs_log_prealloc_extents(trans, inode, path); | |
48778179 FM |
4484 | if (ret) |
4485 | return ret; | |
31d11b83 | 4486 | |
48778179 FM |
4487 | /* |
4488 | * We have logged all extents successfully, now make sure the commit of | |
4489 | * the current transaction waits for the ordered extents to complete | |
4490 | * before it commits and wipes out the log trees, otherwise we would | |
4491 | * lose data if an ordered extents completes after the transaction | |
4492 | * commits and a power failure happens after the transaction commit. | |
4493 | */ | |
4494 | list_for_each_entry_safe(ordered, tmp, &ctx->ordered_extents, log_list) { | |
4495 | list_del_init(&ordered->log_list); | |
4496 | set_bit(BTRFS_ORDERED_LOGGED, &ordered->flags); | |
4497 | ||
4498 | if (!test_bit(BTRFS_ORDERED_COMPLETE, &ordered->flags)) { | |
4499 | spin_lock_irq(&inode->ordered_tree.lock); | |
4500 | if (!test_bit(BTRFS_ORDERED_COMPLETE, &ordered->flags)) { | |
4501 | set_bit(BTRFS_ORDERED_PENDING, &ordered->flags); | |
4502 | atomic_inc(&trans->transaction->pending_ordered); | |
4503 | } | |
4504 | spin_unlock_irq(&inode->ordered_tree.lock); | |
4505 | } | |
4506 | btrfs_put_ordered_extent(ordered); | |
4507 | } | |
4508 | ||
4509 | return 0; | |
5dc562c5 JB |
4510 | } |
4511 | ||
481b01c0 | 4512 | static int logged_inode_size(struct btrfs_root *log, struct btrfs_inode *inode, |
1a4bcf47 FM |
4513 | struct btrfs_path *path, u64 *size_ret) |
4514 | { | |
4515 | struct btrfs_key key; | |
4516 | int ret; | |
4517 | ||
481b01c0 | 4518 | key.objectid = btrfs_ino(inode); |
1a4bcf47 FM |
4519 | key.type = BTRFS_INODE_ITEM_KEY; |
4520 | key.offset = 0; | |
4521 | ||
4522 | ret = btrfs_search_slot(NULL, log, &key, path, 0, 0); | |
4523 | if (ret < 0) { | |
4524 | return ret; | |
4525 | } else if (ret > 0) { | |
2f2ff0ee | 4526 | *size_ret = 0; |
1a4bcf47 FM |
4527 | } else { |
4528 | struct btrfs_inode_item *item; | |
4529 | ||
4530 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
4531 | struct btrfs_inode_item); | |
4532 | *size_ret = btrfs_inode_size(path->nodes[0], item); | |
bf504110 FM |
4533 | /* |
4534 | * If the in-memory inode's i_size is smaller then the inode | |
4535 | * size stored in the btree, return the inode's i_size, so | |
4536 | * that we get a correct inode size after replaying the log | |
4537 | * when before a power failure we had a shrinking truncate | |
4538 | * followed by addition of a new name (rename / new hard link). | |
4539 | * Otherwise return the inode size from the btree, to avoid | |
4540 | * data loss when replaying a log due to previously doing a | |
4541 | * write that expands the inode's size and logging a new name | |
4542 | * immediately after. | |
4543 | */ | |
4544 | if (*size_ret > inode->vfs_inode.i_size) | |
4545 | *size_ret = inode->vfs_inode.i_size; | |
1a4bcf47 FM |
4546 | } |
4547 | ||
4548 | btrfs_release_path(path); | |
4549 | return 0; | |
4550 | } | |
4551 | ||
36283bf7 FM |
4552 | /* |
4553 | * At the moment we always log all xattrs. This is to figure out at log replay | |
4554 | * time which xattrs must have their deletion replayed. If a xattr is missing | |
4555 | * in the log tree and exists in the fs/subvol tree, we delete it. This is | |
4556 | * because if a xattr is deleted, the inode is fsynced and a power failure | |
4557 | * happens, causing the log to be replayed the next time the fs is mounted, | |
4558 | * we want the xattr to not exist anymore (same behaviour as other filesystems | |
4559 | * with a journal, ext3/4, xfs, f2fs, etc). | |
4560 | */ | |
4561 | static int btrfs_log_all_xattrs(struct btrfs_trans_handle *trans, | |
4562 | struct btrfs_root *root, | |
1a93c36a | 4563 | struct btrfs_inode *inode, |
36283bf7 FM |
4564 | struct btrfs_path *path, |
4565 | struct btrfs_path *dst_path) | |
4566 | { | |
4567 | int ret; | |
4568 | struct btrfs_key key; | |
1a93c36a | 4569 | const u64 ino = btrfs_ino(inode); |
36283bf7 FM |
4570 | int ins_nr = 0; |
4571 | int start_slot = 0; | |
f2f121ab FM |
4572 | bool found_xattrs = false; |
4573 | ||
4574 | if (test_bit(BTRFS_INODE_NO_XATTRS, &inode->runtime_flags)) | |
4575 | return 0; | |
36283bf7 FM |
4576 | |
4577 | key.objectid = ino; | |
4578 | key.type = BTRFS_XATTR_ITEM_KEY; | |
4579 | key.offset = 0; | |
4580 | ||
4581 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
4582 | if (ret < 0) | |
4583 | return ret; | |
4584 | ||
4585 | while (true) { | |
4586 | int slot = path->slots[0]; | |
4587 | struct extent_buffer *leaf = path->nodes[0]; | |
4588 | int nritems = btrfs_header_nritems(leaf); | |
4589 | ||
4590 | if (slot >= nritems) { | |
4591 | if (ins_nr > 0) { | |
1a93c36a | 4592 | ret = copy_items(trans, inode, dst_path, path, |
0e56315c | 4593 | start_slot, ins_nr, 1, 0); |
36283bf7 FM |
4594 | if (ret < 0) |
4595 | return ret; | |
4596 | ins_nr = 0; | |
4597 | } | |
4598 | ret = btrfs_next_leaf(root, path); | |
4599 | if (ret < 0) | |
4600 | return ret; | |
4601 | else if (ret > 0) | |
4602 | break; | |
4603 | continue; | |
4604 | } | |
4605 | ||
4606 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
4607 | if (key.objectid != ino || key.type != BTRFS_XATTR_ITEM_KEY) | |
4608 | break; | |
4609 | ||
4610 | if (ins_nr == 0) | |
4611 | start_slot = slot; | |
4612 | ins_nr++; | |
4613 | path->slots[0]++; | |
f2f121ab | 4614 | found_xattrs = true; |
36283bf7 FM |
4615 | cond_resched(); |
4616 | } | |
4617 | if (ins_nr > 0) { | |
1a93c36a | 4618 | ret = copy_items(trans, inode, dst_path, path, |
0e56315c | 4619 | start_slot, ins_nr, 1, 0); |
36283bf7 FM |
4620 | if (ret < 0) |
4621 | return ret; | |
4622 | } | |
4623 | ||
f2f121ab FM |
4624 | if (!found_xattrs) |
4625 | set_bit(BTRFS_INODE_NO_XATTRS, &inode->runtime_flags); | |
4626 | ||
36283bf7 FM |
4627 | return 0; |
4628 | } | |
4629 | ||
a89ca6f2 | 4630 | /* |
0e56315c FM |
4631 | * When using the NO_HOLES feature if we punched a hole that causes the |
4632 | * deletion of entire leafs or all the extent items of the first leaf (the one | |
4633 | * that contains the inode item and references) we may end up not processing | |
4634 | * any extents, because there are no leafs with a generation matching the | |
4635 | * current transaction that have extent items for our inode. So we need to find | |
4636 | * if any holes exist and then log them. We also need to log holes after any | |
4637 | * truncate operation that changes the inode's size. | |
a89ca6f2 | 4638 | */ |
0e56315c FM |
4639 | static int btrfs_log_holes(struct btrfs_trans_handle *trans, |
4640 | struct btrfs_root *root, | |
4641 | struct btrfs_inode *inode, | |
7af59743 | 4642 | struct btrfs_path *path) |
a89ca6f2 | 4643 | { |
0b246afa | 4644 | struct btrfs_fs_info *fs_info = root->fs_info; |
a89ca6f2 | 4645 | struct btrfs_key key; |
a0308dd7 NB |
4646 | const u64 ino = btrfs_ino(inode); |
4647 | const u64 i_size = i_size_read(&inode->vfs_inode); | |
7af59743 | 4648 | u64 prev_extent_end = 0; |
0e56315c | 4649 | int ret; |
a89ca6f2 | 4650 | |
0e56315c | 4651 | if (!btrfs_fs_incompat(fs_info, NO_HOLES) || i_size == 0) |
a89ca6f2 FM |
4652 | return 0; |
4653 | ||
4654 | key.objectid = ino; | |
4655 | key.type = BTRFS_EXTENT_DATA_KEY; | |
7af59743 | 4656 | key.offset = 0; |
a89ca6f2 FM |
4657 | |
4658 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
a89ca6f2 FM |
4659 | if (ret < 0) |
4660 | return ret; | |
4661 | ||
0e56315c | 4662 | while (true) { |
0e56315c | 4663 | struct extent_buffer *leaf = path->nodes[0]; |
a89ca6f2 | 4664 | |
0e56315c FM |
4665 | if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) { |
4666 | ret = btrfs_next_leaf(root, path); | |
4667 | if (ret < 0) | |
4668 | return ret; | |
4669 | if (ret > 0) { | |
4670 | ret = 0; | |
4671 | break; | |
4672 | } | |
4673 | leaf = path->nodes[0]; | |
4674 | } | |
4675 | ||
4676 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
4677 | if (key.objectid != ino || key.type != BTRFS_EXTENT_DATA_KEY) | |
4678 | break; | |
4679 | ||
4680 | /* We have a hole, log it. */ | |
4681 | if (prev_extent_end < key.offset) { | |
7af59743 | 4682 | const u64 hole_len = key.offset - prev_extent_end; |
0e56315c FM |
4683 | |
4684 | /* | |
4685 | * Release the path to avoid deadlocks with other code | |
4686 | * paths that search the root while holding locks on | |
4687 | * leafs from the log root. | |
4688 | */ | |
4689 | btrfs_release_path(path); | |
4690 | ret = btrfs_insert_file_extent(trans, root->log_root, | |
4691 | ino, prev_extent_end, 0, | |
4692 | 0, hole_len, 0, hole_len, | |
4693 | 0, 0, 0); | |
4694 | if (ret < 0) | |
4695 | return ret; | |
4696 | ||
4697 | /* | |
4698 | * Search for the same key again in the root. Since it's | |
4699 | * an extent item and we are holding the inode lock, the | |
4700 | * key must still exist. If it doesn't just emit warning | |
4701 | * and return an error to fall back to a transaction | |
4702 | * commit. | |
4703 | */ | |
4704 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
4705 | if (ret < 0) | |
4706 | return ret; | |
4707 | if (WARN_ON(ret > 0)) | |
4708 | return -ENOENT; | |
4709 | leaf = path->nodes[0]; | |
4710 | } | |
a89ca6f2 | 4711 | |
7af59743 | 4712 | prev_extent_end = btrfs_file_extent_end(path); |
0e56315c FM |
4713 | path->slots[0]++; |
4714 | cond_resched(); | |
a89ca6f2 | 4715 | } |
a89ca6f2 | 4716 | |
7af59743 | 4717 | if (prev_extent_end < i_size) { |
0e56315c | 4718 | u64 hole_len; |
a89ca6f2 | 4719 | |
0e56315c | 4720 | btrfs_release_path(path); |
7af59743 | 4721 | hole_len = ALIGN(i_size - prev_extent_end, fs_info->sectorsize); |
0e56315c FM |
4722 | ret = btrfs_insert_file_extent(trans, root->log_root, |
4723 | ino, prev_extent_end, 0, 0, | |
4724 | hole_len, 0, hole_len, | |
4725 | 0, 0, 0); | |
4726 | if (ret < 0) | |
4727 | return ret; | |
4728 | } | |
4729 | ||
4730 | return 0; | |
a89ca6f2 FM |
4731 | } |
4732 | ||
56f23fdb FM |
4733 | /* |
4734 | * When we are logging a new inode X, check if it doesn't have a reference that | |
4735 | * matches the reference from some other inode Y created in a past transaction | |
4736 | * and that was renamed in the current transaction. If we don't do this, then at | |
4737 | * log replay time we can lose inode Y (and all its files if it's a directory): | |
4738 | * | |
4739 | * mkdir /mnt/x | |
4740 | * echo "hello world" > /mnt/x/foobar | |
4741 | * sync | |
4742 | * mv /mnt/x /mnt/y | |
4743 | * mkdir /mnt/x # or touch /mnt/x | |
4744 | * xfs_io -c fsync /mnt/x | |
4745 | * <power fail> | |
4746 | * mount fs, trigger log replay | |
4747 | * | |
4748 | * After the log replay procedure, we would lose the first directory and all its | |
4749 | * files (file foobar). | |
4750 | * For the case where inode Y is not a directory we simply end up losing it: | |
4751 | * | |
4752 | * echo "123" > /mnt/foo | |
4753 | * sync | |
4754 | * mv /mnt/foo /mnt/bar | |
4755 | * echo "abc" > /mnt/foo | |
4756 | * xfs_io -c fsync /mnt/foo | |
4757 | * <power fail> | |
4758 | * | |
4759 | * We also need this for cases where a snapshot entry is replaced by some other | |
4760 | * entry (file or directory) otherwise we end up with an unreplayable log due to | |
4761 | * attempts to delete the snapshot entry (entry of type BTRFS_ROOT_ITEM_KEY) as | |
4762 | * if it were a regular entry: | |
4763 | * | |
4764 | * mkdir /mnt/x | |
4765 | * btrfs subvolume snapshot /mnt /mnt/x/snap | |
4766 | * btrfs subvolume delete /mnt/x/snap | |
4767 | * rmdir /mnt/x | |
4768 | * mkdir /mnt/x | |
4769 | * fsync /mnt/x or fsync some new file inside it | |
4770 | * <power fail> | |
4771 | * | |
4772 | * The snapshot delete, rmdir of x, mkdir of a new x and the fsync all happen in | |
4773 | * the same transaction. | |
4774 | */ | |
4775 | static int btrfs_check_ref_name_override(struct extent_buffer *eb, | |
4776 | const int slot, | |
4777 | const struct btrfs_key *key, | |
4791c8f1 | 4778 | struct btrfs_inode *inode, |
a3baaf0d | 4779 | u64 *other_ino, u64 *other_parent) |
56f23fdb FM |
4780 | { |
4781 | int ret; | |
4782 | struct btrfs_path *search_path; | |
4783 | char *name = NULL; | |
4784 | u32 name_len = 0; | |
4785 | u32 item_size = btrfs_item_size_nr(eb, slot); | |
4786 | u32 cur_offset = 0; | |
4787 | unsigned long ptr = btrfs_item_ptr_offset(eb, slot); | |
4788 | ||
4789 | search_path = btrfs_alloc_path(); | |
4790 | if (!search_path) | |
4791 | return -ENOMEM; | |
4792 | search_path->search_commit_root = 1; | |
4793 | search_path->skip_locking = 1; | |
4794 | ||
4795 | while (cur_offset < item_size) { | |
4796 | u64 parent; | |
4797 | u32 this_name_len; | |
4798 | u32 this_len; | |
4799 | unsigned long name_ptr; | |
4800 | struct btrfs_dir_item *di; | |
4801 | ||
4802 | if (key->type == BTRFS_INODE_REF_KEY) { | |
4803 | struct btrfs_inode_ref *iref; | |
4804 | ||
4805 | iref = (struct btrfs_inode_ref *)(ptr + cur_offset); | |
4806 | parent = key->offset; | |
4807 | this_name_len = btrfs_inode_ref_name_len(eb, iref); | |
4808 | name_ptr = (unsigned long)(iref + 1); | |
4809 | this_len = sizeof(*iref) + this_name_len; | |
4810 | } else { | |
4811 | struct btrfs_inode_extref *extref; | |
4812 | ||
4813 | extref = (struct btrfs_inode_extref *)(ptr + | |
4814 | cur_offset); | |
4815 | parent = btrfs_inode_extref_parent(eb, extref); | |
4816 | this_name_len = btrfs_inode_extref_name_len(eb, extref); | |
4817 | name_ptr = (unsigned long)&extref->name; | |
4818 | this_len = sizeof(*extref) + this_name_len; | |
4819 | } | |
4820 | ||
4821 | if (this_name_len > name_len) { | |
4822 | char *new_name; | |
4823 | ||
4824 | new_name = krealloc(name, this_name_len, GFP_NOFS); | |
4825 | if (!new_name) { | |
4826 | ret = -ENOMEM; | |
4827 | goto out; | |
4828 | } | |
4829 | name_len = this_name_len; | |
4830 | name = new_name; | |
4831 | } | |
4832 | ||
4833 | read_extent_buffer(eb, name, name_ptr, this_name_len); | |
4791c8f1 NB |
4834 | di = btrfs_lookup_dir_item(NULL, inode->root, search_path, |
4835 | parent, name, this_name_len, 0); | |
56f23fdb | 4836 | if (di && !IS_ERR(di)) { |
44f714da FM |
4837 | struct btrfs_key di_key; |
4838 | ||
4839 | btrfs_dir_item_key_to_cpu(search_path->nodes[0], | |
4840 | di, &di_key); | |
4841 | if (di_key.type == BTRFS_INODE_ITEM_KEY) { | |
6b5fc433 FM |
4842 | if (di_key.objectid != key->objectid) { |
4843 | ret = 1; | |
4844 | *other_ino = di_key.objectid; | |
a3baaf0d | 4845 | *other_parent = parent; |
6b5fc433 FM |
4846 | } else { |
4847 | ret = 0; | |
4848 | } | |
44f714da FM |
4849 | } else { |
4850 | ret = -EAGAIN; | |
4851 | } | |
56f23fdb FM |
4852 | goto out; |
4853 | } else if (IS_ERR(di)) { | |
4854 | ret = PTR_ERR(di); | |
4855 | goto out; | |
4856 | } | |
4857 | btrfs_release_path(search_path); | |
4858 | ||
4859 | cur_offset += this_len; | |
4860 | } | |
4861 | ret = 0; | |
4862 | out: | |
4863 | btrfs_free_path(search_path); | |
4864 | kfree(name); | |
4865 | return ret; | |
4866 | } | |
4867 | ||
6b5fc433 FM |
4868 | struct btrfs_ino_list { |
4869 | u64 ino; | |
a3baaf0d | 4870 | u64 parent; |
6b5fc433 FM |
4871 | struct list_head list; |
4872 | }; | |
4873 | ||
4874 | static int log_conflicting_inodes(struct btrfs_trans_handle *trans, | |
4875 | struct btrfs_root *root, | |
4876 | struct btrfs_path *path, | |
4877 | struct btrfs_log_ctx *ctx, | |
a3baaf0d | 4878 | u64 ino, u64 parent) |
6b5fc433 FM |
4879 | { |
4880 | struct btrfs_ino_list *ino_elem; | |
4881 | LIST_HEAD(inode_list); | |
4882 | int ret = 0; | |
4883 | ||
4884 | ino_elem = kmalloc(sizeof(*ino_elem), GFP_NOFS); | |
4885 | if (!ino_elem) | |
4886 | return -ENOMEM; | |
4887 | ino_elem->ino = ino; | |
a3baaf0d | 4888 | ino_elem->parent = parent; |
6b5fc433 FM |
4889 | list_add_tail(&ino_elem->list, &inode_list); |
4890 | ||
4891 | while (!list_empty(&inode_list)) { | |
4892 | struct btrfs_fs_info *fs_info = root->fs_info; | |
4893 | struct btrfs_key key; | |
4894 | struct inode *inode; | |
4895 | ||
4896 | ino_elem = list_first_entry(&inode_list, struct btrfs_ino_list, | |
4897 | list); | |
4898 | ino = ino_elem->ino; | |
a3baaf0d | 4899 | parent = ino_elem->parent; |
6b5fc433 FM |
4900 | list_del(&ino_elem->list); |
4901 | kfree(ino_elem); | |
4902 | if (ret) | |
4903 | continue; | |
4904 | ||
4905 | btrfs_release_path(path); | |
4906 | ||
0202e83f | 4907 | inode = btrfs_iget(fs_info->sb, ino, root); |
6b5fc433 FM |
4908 | /* |
4909 | * If the other inode that had a conflicting dir entry was | |
a3baaf0d FM |
4910 | * deleted in the current transaction, we need to log its parent |
4911 | * directory. | |
6b5fc433 FM |
4912 | */ |
4913 | if (IS_ERR(inode)) { | |
4914 | ret = PTR_ERR(inode); | |
a3baaf0d | 4915 | if (ret == -ENOENT) { |
0202e83f | 4916 | inode = btrfs_iget(fs_info->sb, parent, root); |
a3baaf0d FM |
4917 | if (IS_ERR(inode)) { |
4918 | ret = PTR_ERR(inode); | |
4919 | } else { | |
4920 | ret = btrfs_log_inode(trans, root, | |
4921 | BTRFS_I(inode), | |
4922 | LOG_OTHER_INODE_ALL, | |
48778179 | 4923 | ctx); |
410f954c | 4924 | btrfs_add_delayed_iput(inode); |
a3baaf0d FM |
4925 | } |
4926 | } | |
6b5fc433 FM |
4927 | continue; |
4928 | } | |
b5e4ff9d FM |
4929 | /* |
4930 | * If the inode was already logged skip it - otherwise we can | |
4931 | * hit an infinite loop. Example: | |
4932 | * | |
4933 | * From the commit root (previous transaction) we have the | |
4934 | * following inodes: | |
4935 | * | |
4936 | * inode 257 a directory | |
4937 | * inode 258 with references "zz" and "zz_link" on inode 257 | |
4938 | * inode 259 with reference "a" on inode 257 | |
4939 | * | |
4940 | * And in the current (uncommitted) transaction we have: | |
4941 | * | |
4942 | * inode 257 a directory, unchanged | |
4943 | * inode 258 with references "a" and "a2" on inode 257 | |
4944 | * inode 259 with reference "zz_link" on inode 257 | |
4945 | * inode 261 with reference "zz" on inode 257 | |
4946 | * | |
4947 | * When logging inode 261 the following infinite loop could | |
4948 | * happen if we don't skip already logged inodes: | |
4949 | * | |
4950 | * - we detect inode 258 as a conflicting inode, with inode 261 | |
4951 | * on reference "zz", and log it; | |
4952 | * | |
4953 | * - we detect inode 259 as a conflicting inode, with inode 258 | |
4954 | * on reference "a", and log it; | |
4955 | * | |
4956 | * - we detect inode 258 as a conflicting inode, with inode 259 | |
4957 | * on reference "zz_link", and log it - again! After this we | |
4958 | * repeat the above steps forever. | |
4959 | */ | |
4960 | spin_lock(&BTRFS_I(inode)->lock); | |
4961 | /* | |
4962 | * Check the inode's logged_trans only instead of | |
4963 | * btrfs_inode_in_log(). This is because the last_log_commit of | |
4964 | * the inode is not updated when we only log that it exists and | |
260db43c | 4965 | * it has the full sync bit set (see btrfs_log_inode()). |
b5e4ff9d FM |
4966 | */ |
4967 | if (BTRFS_I(inode)->logged_trans == trans->transid) { | |
4968 | spin_unlock(&BTRFS_I(inode)->lock); | |
4969 | btrfs_add_delayed_iput(inode); | |
4970 | continue; | |
4971 | } | |
4972 | spin_unlock(&BTRFS_I(inode)->lock); | |
6b5fc433 FM |
4973 | /* |
4974 | * We are safe logging the other inode without acquiring its | |
4975 | * lock as long as we log with the LOG_INODE_EXISTS mode. We | |
4976 | * are safe against concurrent renames of the other inode as | |
4977 | * well because during a rename we pin the log and update the | |
4978 | * log with the new name before we unpin it. | |
4979 | */ | |
4980 | ret = btrfs_log_inode(trans, root, BTRFS_I(inode), | |
48778179 | 4981 | LOG_OTHER_INODE, ctx); |
6b5fc433 | 4982 | if (ret) { |
410f954c | 4983 | btrfs_add_delayed_iput(inode); |
6b5fc433 FM |
4984 | continue; |
4985 | } | |
4986 | ||
4987 | key.objectid = ino; | |
4988 | key.type = BTRFS_INODE_REF_KEY; | |
4989 | key.offset = 0; | |
4990 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
4991 | if (ret < 0) { | |
410f954c | 4992 | btrfs_add_delayed_iput(inode); |
6b5fc433 FM |
4993 | continue; |
4994 | } | |
4995 | ||
4996 | while (true) { | |
4997 | struct extent_buffer *leaf = path->nodes[0]; | |
4998 | int slot = path->slots[0]; | |
4999 | u64 other_ino = 0; | |
a3baaf0d | 5000 | u64 other_parent = 0; |
6b5fc433 FM |
5001 | |
5002 | if (slot >= btrfs_header_nritems(leaf)) { | |
5003 | ret = btrfs_next_leaf(root, path); | |
5004 | if (ret < 0) { | |
5005 | break; | |
5006 | } else if (ret > 0) { | |
5007 | ret = 0; | |
5008 | break; | |
5009 | } | |
5010 | continue; | |
5011 | } | |
5012 | ||
5013 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
5014 | if (key.objectid != ino || | |
5015 | (key.type != BTRFS_INODE_REF_KEY && | |
5016 | key.type != BTRFS_INODE_EXTREF_KEY)) { | |
5017 | ret = 0; | |
5018 | break; | |
5019 | } | |
5020 | ||
5021 | ret = btrfs_check_ref_name_override(leaf, slot, &key, | |
a3baaf0d FM |
5022 | BTRFS_I(inode), &other_ino, |
5023 | &other_parent); | |
6b5fc433 FM |
5024 | if (ret < 0) |
5025 | break; | |
5026 | if (ret > 0) { | |
5027 | ino_elem = kmalloc(sizeof(*ino_elem), GFP_NOFS); | |
5028 | if (!ino_elem) { | |
5029 | ret = -ENOMEM; | |
5030 | break; | |
5031 | } | |
5032 | ino_elem->ino = other_ino; | |
a3baaf0d | 5033 | ino_elem->parent = other_parent; |
6b5fc433 FM |
5034 | list_add_tail(&ino_elem->list, &inode_list); |
5035 | ret = 0; | |
5036 | } | |
5037 | path->slots[0]++; | |
5038 | } | |
410f954c | 5039 | btrfs_add_delayed_iput(inode); |
6b5fc433 FM |
5040 | } |
5041 | ||
5042 | return ret; | |
5043 | } | |
5044 | ||
da447009 FM |
5045 | static int copy_inode_items_to_log(struct btrfs_trans_handle *trans, |
5046 | struct btrfs_inode *inode, | |
5047 | struct btrfs_key *min_key, | |
5048 | const struct btrfs_key *max_key, | |
5049 | struct btrfs_path *path, | |
5050 | struct btrfs_path *dst_path, | |
5051 | const u64 logged_isize, | |
5052 | const bool recursive_logging, | |
5053 | const int inode_only, | |
5054 | struct btrfs_log_ctx *ctx, | |
5055 | bool *need_log_inode_item) | |
5056 | { | |
5057 | struct btrfs_root *root = inode->root; | |
5058 | int ins_start_slot = 0; | |
5059 | int ins_nr = 0; | |
5060 | int ret; | |
5061 | ||
5062 | while (1) { | |
5063 | ret = btrfs_search_forward(root, min_key, path, trans->transid); | |
5064 | if (ret < 0) | |
5065 | return ret; | |
5066 | if (ret > 0) { | |
5067 | ret = 0; | |
5068 | break; | |
5069 | } | |
5070 | again: | |
5071 | /* Note, ins_nr might be > 0 here, cleanup outside the loop */ | |
5072 | if (min_key->objectid != max_key->objectid) | |
5073 | break; | |
5074 | if (min_key->type > max_key->type) | |
5075 | break; | |
5076 | ||
5077 | if (min_key->type == BTRFS_INODE_ITEM_KEY) | |
5078 | *need_log_inode_item = false; | |
5079 | ||
5080 | if ((min_key->type == BTRFS_INODE_REF_KEY || | |
5081 | min_key->type == BTRFS_INODE_EXTREF_KEY) && | |
5082 | inode->generation == trans->transid && | |
5083 | !recursive_logging) { | |
5084 | u64 other_ino = 0; | |
5085 | u64 other_parent = 0; | |
5086 | ||
5087 | ret = btrfs_check_ref_name_override(path->nodes[0], | |
5088 | path->slots[0], min_key, inode, | |
5089 | &other_ino, &other_parent); | |
5090 | if (ret < 0) { | |
5091 | return ret; | |
5092 | } else if (ret > 0 && ctx && | |
5093 | other_ino != btrfs_ino(BTRFS_I(ctx->inode))) { | |
5094 | if (ins_nr > 0) { | |
5095 | ins_nr++; | |
5096 | } else { | |
5097 | ins_nr = 1; | |
5098 | ins_start_slot = path->slots[0]; | |
5099 | } | |
5100 | ret = copy_items(trans, inode, dst_path, path, | |
5101 | ins_start_slot, ins_nr, | |
5102 | inode_only, logged_isize); | |
5103 | if (ret < 0) | |
5104 | return ret; | |
5105 | ins_nr = 0; | |
5106 | ||
5107 | ret = log_conflicting_inodes(trans, root, path, | |
5108 | ctx, other_ino, other_parent); | |
5109 | if (ret) | |
5110 | return ret; | |
5111 | btrfs_release_path(path); | |
5112 | goto next_key; | |
5113 | } | |
5114 | } | |
5115 | ||
5116 | /* Skip xattrs, we log them later with btrfs_log_all_xattrs() */ | |
5117 | if (min_key->type == BTRFS_XATTR_ITEM_KEY) { | |
5118 | if (ins_nr == 0) | |
5119 | goto next_slot; | |
5120 | ret = copy_items(trans, inode, dst_path, path, | |
5121 | ins_start_slot, | |
5122 | ins_nr, inode_only, logged_isize); | |
5123 | if (ret < 0) | |
5124 | return ret; | |
5125 | ins_nr = 0; | |
5126 | goto next_slot; | |
5127 | } | |
5128 | ||
5129 | if (ins_nr && ins_start_slot + ins_nr == path->slots[0]) { | |
5130 | ins_nr++; | |
5131 | goto next_slot; | |
5132 | } else if (!ins_nr) { | |
5133 | ins_start_slot = path->slots[0]; | |
5134 | ins_nr = 1; | |
5135 | goto next_slot; | |
5136 | } | |
5137 | ||
5138 | ret = copy_items(trans, inode, dst_path, path, ins_start_slot, | |
5139 | ins_nr, inode_only, logged_isize); | |
5140 | if (ret < 0) | |
5141 | return ret; | |
5142 | ins_nr = 1; | |
5143 | ins_start_slot = path->slots[0]; | |
5144 | next_slot: | |
5145 | path->slots[0]++; | |
5146 | if (path->slots[0] < btrfs_header_nritems(path->nodes[0])) { | |
5147 | btrfs_item_key_to_cpu(path->nodes[0], min_key, | |
5148 | path->slots[0]); | |
5149 | goto again; | |
5150 | } | |
5151 | if (ins_nr) { | |
5152 | ret = copy_items(trans, inode, dst_path, path, | |
5153 | ins_start_slot, ins_nr, inode_only, | |
5154 | logged_isize); | |
5155 | if (ret < 0) | |
5156 | return ret; | |
5157 | ins_nr = 0; | |
5158 | } | |
5159 | btrfs_release_path(path); | |
5160 | next_key: | |
5161 | if (min_key->offset < (u64)-1) { | |
5162 | min_key->offset++; | |
5163 | } else if (min_key->type < max_key->type) { | |
5164 | min_key->type++; | |
5165 | min_key->offset = 0; | |
5166 | } else { | |
5167 | break; | |
5168 | } | |
5169 | } | |
5170 | if (ins_nr) | |
5171 | ret = copy_items(trans, inode, dst_path, path, ins_start_slot, | |
5172 | ins_nr, inode_only, logged_isize); | |
5173 | ||
5174 | return ret; | |
5175 | } | |
5176 | ||
e02119d5 CM |
5177 | /* log a single inode in the tree log. |
5178 | * At least one parent directory for this inode must exist in the tree | |
5179 | * or be logged already. | |
5180 | * | |
5181 | * Any items from this inode changed by the current transaction are copied | |
5182 | * to the log tree. An extra reference is taken on any extents in this | |
5183 | * file, allowing us to avoid a whole pile of corner cases around logging | |
5184 | * blocks that have been removed from the tree. | |
5185 | * | |
5186 | * See LOG_INODE_ALL and related defines for a description of what inode_only | |
5187 | * does. | |
5188 | * | |
5189 | * This handles both files and directories. | |
5190 | */ | |
12fcfd22 | 5191 | static int btrfs_log_inode(struct btrfs_trans_handle *trans, |
a59108a7 | 5192 | struct btrfs_root *root, struct btrfs_inode *inode, |
49dae1bc | 5193 | int inode_only, |
8407f553 | 5194 | struct btrfs_log_ctx *ctx) |
e02119d5 CM |
5195 | { |
5196 | struct btrfs_path *path; | |
5197 | struct btrfs_path *dst_path; | |
5198 | struct btrfs_key min_key; | |
5199 | struct btrfs_key max_key; | |
5200 | struct btrfs_root *log = root->log_root; | |
4a500fd1 | 5201 | int err = 0; |
8c8648dd | 5202 | int ret = 0; |
5dc562c5 | 5203 | bool fast_search = false; |
a59108a7 NB |
5204 | u64 ino = btrfs_ino(inode); |
5205 | struct extent_map_tree *em_tree = &inode->extent_tree; | |
1a4bcf47 | 5206 | u64 logged_isize = 0; |
e4545de5 | 5207 | bool need_log_inode_item = true; |
9a8fca62 | 5208 | bool xattrs_logged = false; |
a3baaf0d | 5209 | bool recursive_logging = false; |
e02119d5 | 5210 | |
e02119d5 | 5211 | path = btrfs_alloc_path(); |
5df67083 TI |
5212 | if (!path) |
5213 | return -ENOMEM; | |
e02119d5 | 5214 | dst_path = btrfs_alloc_path(); |
5df67083 TI |
5215 | if (!dst_path) { |
5216 | btrfs_free_path(path); | |
5217 | return -ENOMEM; | |
5218 | } | |
e02119d5 | 5219 | |
33345d01 | 5220 | min_key.objectid = ino; |
e02119d5 CM |
5221 | min_key.type = BTRFS_INODE_ITEM_KEY; |
5222 | min_key.offset = 0; | |
5223 | ||
33345d01 | 5224 | max_key.objectid = ino; |
12fcfd22 | 5225 | |
12fcfd22 | 5226 | |
5dc562c5 | 5227 | /* today the code can only do partial logging of directories */ |
a59108a7 | 5228 | if (S_ISDIR(inode->vfs_inode.i_mode) || |
5269b67e | 5229 | (!test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
a59108a7 | 5230 | &inode->runtime_flags) && |
781feef7 | 5231 | inode_only >= LOG_INODE_EXISTS)) |
e02119d5 CM |
5232 | max_key.type = BTRFS_XATTR_ITEM_KEY; |
5233 | else | |
5234 | max_key.type = (u8)-1; | |
5235 | max_key.offset = (u64)-1; | |
5236 | ||
2c2c452b | 5237 | /* |
5aa7d1a7 FM |
5238 | * Only run delayed items if we are a directory. We want to make sure |
5239 | * all directory indexes hit the fs/subvolume tree so we can find them | |
5240 | * and figure out which index ranges have to be logged. | |
5241 | * | |
8c8648dd FM |
5242 | * Otherwise commit the delayed inode only if the full sync flag is set, |
5243 | * as we want to make sure an up to date version is in the subvolume | |
5244 | * tree so copy_inode_items_to_log() / copy_items() can find it and copy | |
5245 | * it to the log tree. For a non full sync, we always log the inode item | |
5246 | * based on the in-memory struct btrfs_inode which is always up to date. | |
2c2c452b | 5247 | */ |
5aa7d1a7 | 5248 | if (S_ISDIR(inode->vfs_inode.i_mode)) |
a59108a7 | 5249 | ret = btrfs_commit_inode_delayed_items(trans, inode); |
8c8648dd | 5250 | else if (test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags)) |
a59108a7 | 5251 | ret = btrfs_commit_inode_delayed_inode(inode); |
2c2c452b FM |
5252 | |
5253 | if (ret) { | |
5254 | btrfs_free_path(path); | |
5255 | btrfs_free_path(dst_path); | |
5256 | return ret; | |
16cdcec7 MX |
5257 | } |
5258 | ||
a3baaf0d FM |
5259 | if (inode_only == LOG_OTHER_INODE || inode_only == LOG_OTHER_INODE_ALL) { |
5260 | recursive_logging = true; | |
5261 | if (inode_only == LOG_OTHER_INODE) | |
5262 | inode_only = LOG_INODE_EXISTS; | |
5263 | else | |
5264 | inode_only = LOG_INODE_ALL; | |
a59108a7 | 5265 | mutex_lock_nested(&inode->log_mutex, SINGLE_DEPTH_NESTING); |
781feef7 | 5266 | } else { |
a59108a7 | 5267 | mutex_lock(&inode->log_mutex); |
781feef7 | 5268 | } |
e02119d5 CM |
5269 | |
5270 | /* | |
5271 | * a brute force approach to making sure we get the most uptodate | |
5272 | * copies of everything. | |
5273 | */ | |
a59108a7 | 5274 | if (S_ISDIR(inode->vfs_inode.i_mode)) { |
e02119d5 CM |
5275 | int max_key_type = BTRFS_DIR_LOG_INDEX_KEY; |
5276 | ||
4f764e51 FM |
5277 | if (inode_only == LOG_INODE_EXISTS) |
5278 | max_key_type = BTRFS_XATTR_ITEM_KEY; | |
33345d01 | 5279 | ret = drop_objectid_items(trans, log, path, ino, max_key_type); |
e02119d5 | 5280 | } else { |
1a4bcf47 FM |
5281 | if (inode_only == LOG_INODE_EXISTS) { |
5282 | /* | |
5283 | * Make sure the new inode item we write to the log has | |
5284 | * the same isize as the current one (if it exists). | |
5285 | * This is necessary to prevent data loss after log | |
5286 | * replay, and also to prevent doing a wrong expanding | |
5287 | * truncate - for e.g. create file, write 4K into offset | |
5288 | * 0, fsync, write 4K into offset 4096, add hard link, | |
5289 | * fsync some other file (to sync log), power fail - if | |
5290 | * we use the inode's current i_size, after log replay | |
5291 | * we get a 8Kb file, with the last 4Kb extent as a hole | |
5292 | * (zeroes), as if an expanding truncate happened, | |
5293 | * instead of getting a file of 4Kb only. | |
5294 | */ | |
a59108a7 | 5295 | err = logged_inode_size(log, inode, path, &logged_isize); |
1a4bcf47 FM |
5296 | if (err) |
5297 | goto out_unlock; | |
5298 | } | |
a742994a | 5299 | if (test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, |
a59108a7 | 5300 | &inode->runtime_flags)) { |
a742994a | 5301 | if (inode_only == LOG_INODE_EXISTS) { |
4f764e51 | 5302 | max_key.type = BTRFS_XATTR_ITEM_KEY; |
a742994a FM |
5303 | ret = drop_objectid_items(trans, log, path, ino, |
5304 | max_key.type); | |
5305 | } else { | |
5306 | clear_bit(BTRFS_INODE_NEEDS_FULL_SYNC, | |
a59108a7 | 5307 | &inode->runtime_flags); |
a742994a | 5308 | clear_bit(BTRFS_INODE_COPY_EVERYTHING, |
a59108a7 | 5309 | &inode->runtime_flags); |
28ed1345 CM |
5310 | while(1) { |
5311 | ret = btrfs_truncate_inode_items(trans, | |
50743398 | 5312 | log, inode, 0, 0); |
28ed1345 CM |
5313 | if (ret != -EAGAIN) |
5314 | break; | |
5315 | } | |
a742994a | 5316 | } |
4f764e51 | 5317 | } else if (test_and_clear_bit(BTRFS_INODE_COPY_EVERYTHING, |
a59108a7 | 5318 | &inode->runtime_flags) || |
6cfab851 | 5319 | inode_only == LOG_INODE_EXISTS) { |
4f764e51 | 5320 | if (inode_only == LOG_INODE_ALL) |
183f37fa | 5321 | fast_search = true; |
4f764e51 | 5322 | max_key.type = BTRFS_XATTR_ITEM_KEY; |
5dc562c5 | 5323 | ret = drop_objectid_items(trans, log, path, ino, |
e9976151 | 5324 | max_key.type); |
a95249b3 JB |
5325 | } else { |
5326 | if (inode_only == LOG_INODE_ALL) | |
5327 | fast_search = true; | |
a95249b3 | 5328 | goto log_extents; |
5dc562c5 | 5329 | } |
a95249b3 | 5330 | |
e02119d5 | 5331 | } |
4a500fd1 YZ |
5332 | if (ret) { |
5333 | err = ret; | |
5334 | goto out_unlock; | |
5335 | } | |
e02119d5 | 5336 | |
da447009 FM |
5337 | err = copy_inode_items_to_log(trans, inode, &min_key, &max_key, |
5338 | path, dst_path, logged_isize, | |
7af59743 FM |
5339 | recursive_logging, inode_only, ctx, |
5340 | &need_log_inode_item); | |
da447009 FM |
5341 | if (err) |
5342 | goto out_unlock; | |
5dc562c5 | 5343 | |
36283bf7 FM |
5344 | btrfs_release_path(path); |
5345 | btrfs_release_path(dst_path); | |
a59108a7 | 5346 | err = btrfs_log_all_xattrs(trans, root, inode, path, dst_path); |
36283bf7 FM |
5347 | if (err) |
5348 | goto out_unlock; | |
9a8fca62 | 5349 | xattrs_logged = true; |
a89ca6f2 FM |
5350 | if (max_key.type >= BTRFS_EXTENT_DATA_KEY && !fast_search) { |
5351 | btrfs_release_path(path); | |
5352 | btrfs_release_path(dst_path); | |
7af59743 | 5353 | err = btrfs_log_holes(trans, root, inode, path); |
a89ca6f2 FM |
5354 | if (err) |
5355 | goto out_unlock; | |
5356 | } | |
a95249b3 | 5357 | log_extents: |
f3b15ccd JB |
5358 | btrfs_release_path(path); |
5359 | btrfs_release_path(dst_path); | |
e4545de5 | 5360 | if (need_log_inode_item) { |
a59108a7 | 5361 | err = log_inode_item(trans, log, dst_path, inode); |
9a8fca62 FM |
5362 | if (!err && !xattrs_logged) { |
5363 | err = btrfs_log_all_xattrs(trans, root, inode, path, | |
5364 | dst_path); | |
5365 | btrfs_release_path(path); | |
5366 | } | |
e4545de5 FM |
5367 | if (err) |
5368 | goto out_unlock; | |
5369 | } | |
5dc562c5 | 5370 | if (fast_search) { |
a59108a7 | 5371 | ret = btrfs_log_changed_extents(trans, root, inode, dst_path, |
48778179 | 5372 | ctx); |
5dc562c5 JB |
5373 | if (ret) { |
5374 | err = ret; | |
5375 | goto out_unlock; | |
5376 | } | |
d006a048 | 5377 | } else if (inode_only == LOG_INODE_ALL) { |
06d3d22b LB |
5378 | struct extent_map *em, *n; |
5379 | ||
49dae1bc | 5380 | write_lock(&em_tree->lock); |
48778179 FM |
5381 | list_for_each_entry_safe(em, n, &em_tree->modified_extents, list) |
5382 | list_del_init(&em->list); | |
49dae1bc | 5383 | write_unlock(&em_tree->lock); |
5dc562c5 JB |
5384 | } |
5385 | ||
a59108a7 NB |
5386 | if (inode_only == LOG_INODE_ALL && S_ISDIR(inode->vfs_inode.i_mode)) { |
5387 | ret = log_directory_changes(trans, root, inode, path, dst_path, | |
5388 | ctx); | |
4a500fd1 YZ |
5389 | if (ret) { |
5390 | err = ret; | |
5391 | goto out_unlock; | |
5392 | } | |
e02119d5 | 5393 | } |
49dae1bc | 5394 | |
d1d832a0 | 5395 | /* |
75b463d2 FM |
5396 | * If we are logging that an ancestor inode exists as part of logging a |
5397 | * new name from a link or rename operation, don't mark the inode as | |
5398 | * logged - otherwise if an explicit fsync is made against an ancestor, | |
5399 | * the fsync considers the inode in the log and doesn't sync the log, | |
5400 | * resulting in the ancestor missing after a power failure unless the | |
5401 | * log was synced as part of an fsync against any other unrelated inode. | |
5402 | * So keep it simple for this case and just don't flag the ancestors as | |
5403 | * logged. | |
d1d832a0 | 5404 | */ |
75b463d2 FM |
5405 | if (!ctx || |
5406 | !(S_ISDIR(inode->vfs_inode.i_mode) && ctx->logging_new_name && | |
5407 | &inode->vfs_inode != ctx->inode)) { | |
5408 | spin_lock(&inode->lock); | |
5409 | inode->logged_trans = trans->transid; | |
5410 | /* | |
5411 | * Don't update last_log_commit if we logged that an inode exists | |
5412 | * after it was loaded to memory (full_sync bit set). | |
5413 | * This is to prevent data loss when we do a write to the inode, | |
5414 | * then the inode gets evicted after all delalloc was flushed, | |
5415 | * then we log it exists (due to a rename for example) and then | |
5416 | * fsync it. This last fsync would do nothing (not logging the | |
5417 | * extents previously written). | |
5418 | */ | |
5419 | if (inode_only != LOG_INODE_EXISTS || | |
5420 | !test_bit(BTRFS_INODE_NEEDS_FULL_SYNC, &inode->runtime_flags)) | |
5421 | inode->last_log_commit = inode->last_sub_trans; | |
5422 | spin_unlock(&inode->lock); | |
5423 | } | |
4a500fd1 | 5424 | out_unlock: |
a59108a7 | 5425 | mutex_unlock(&inode->log_mutex); |
e02119d5 CM |
5426 | |
5427 | btrfs_free_path(path); | |
5428 | btrfs_free_path(dst_path); | |
4a500fd1 | 5429 | return err; |
e02119d5 CM |
5430 | } |
5431 | ||
2be63d5c FM |
5432 | /* |
5433 | * Check if we must fallback to a transaction commit when logging an inode. | |
5434 | * This must be called after logging the inode and is used only in the context | |
5435 | * when fsyncing an inode requires the need to log some other inode - in which | |
5436 | * case we can't lock the i_mutex of each other inode we need to log as that | |
5437 | * can lead to deadlocks with concurrent fsync against other inodes (as we can | |
5438 | * log inodes up or down in the hierarchy) or rename operations for example. So | |
5439 | * we take the log_mutex of the inode after we have logged it and then check for | |
5440 | * its last_unlink_trans value - this is safe because any task setting | |
5441 | * last_unlink_trans must take the log_mutex and it must do this before it does | |
5442 | * the actual unlink operation, so if we do this check before a concurrent task | |
5443 | * sets last_unlink_trans it means we've logged a consistent version/state of | |
5444 | * all the inode items, otherwise we are not sure and must do a transaction | |
01327610 | 5445 | * commit (the concurrent task might have only updated last_unlink_trans before |
2be63d5c FM |
5446 | * we logged the inode or it might have also done the unlink). |
5447 | */ | |
5448 | static bool btrfs_must_commit_transaction(struct btrfs_trans_handle *trans, | |
ab1717b2 | 5449 | struct btrfs_inode *inode) |
2be63d5c | 5450 | { |
ab1717b2 | 5451 | struct btrfs_fs_info *fs_info = inode->root->fs_info; |
2be63d5c FM |
5452 | bool ret = false; |
5453 | ||
ab1717b2 NB |
5454 | mutex_lock(&inode->log_mutex); |
5455 | if (inode->last_unlink_trans > fs_info->last_trans_committed) { | |
2be63d5c FM |
5456 | /* |
5457 | * Make sure any commits to the log are forced to be full | |
5458 | * commits. | |
5459 | */ | |
90787766 | 5460 | btrfs_set_log_full_commit(trans); |
2be63d5c FM |
5461 | ret = true; |
5462 | } | |
ab1717b2 | 5463 | mutex_unlock(&inode->log_mutex); |
2be63d5c FM |
5464 | |
5465 | return ret; | |
5466 | } | |
5467 | ||
12fcfd22 CM |
5468 | /* |
5469 | * follow the dentry parent pointers up the chain and see if any | |
5470 | * of the directories in it require a full commit before they can | |
5471 | * be logged. Returns zero if nothing special needs to be done or 1 if | |
5472 | * a full commit is required. | |
5473 | */ | |
5474 | static noinline int check_parent_dirs_for_sync(struct btrfs_trans_handle *trans, | |
aefa6115 | 5475 | struct btrfs_inode *inode, |
12fcfd22 CM |
5476 | struct dentry *parent, |
5477 | struct super_block *sb, | |
5478 | u64 last_committed) | |
e02119d5 | 5479 | { |
12fcfd22 | 5480 | int ret = 0; |
6a912213 | 5481 | struct dentry *old_parent = NULL; |
e02119d5 | 5482 | |
af4176b4 CM |
5483 | /* |
5484 | * for regular files, if its inode is already on disk, we don't | |
5485 | * have to worry about the parents at all. This is because | |
5486 | * we can use the last_unlink_trans field to record renames | |
5487 | * and other fun in this file. | |
5488 | */ | |
aefa6115 NB |
5489 | if (S_ISREG(inode->vfs_inode.i_mode) && |
5490 | inode->generation <= last_committed && | |
5491 | inode->last_unlink_trans <= last_committed) | |
5492 | goto out; | |
af4176b4 | 5493 | |
aefa6115 | 5494 | if (!S_ISDIR(inode->vfs_inode.i_mode)) { |
fc64005c | 5495 | if (!parent || d_really_is_negative(parent) || sb != parent->d_sb) |
12fcfd22 | 5496 | goto out; |
aefa6115 | 5497 | inode = BTRFS_I(d_inode(parent)); |
12fcfd22 CM |
5498 | } |
5499 | ||
5500 | while (1) { | |
aefa6115 | 5501 | if (btrfs_must_commit_transaction(trans, inode)) { |
12fcfd22 CM |
5502 | ret = 1; |
5503 | break; | |
5504 | } | |
5505 | ||
fc64005c | 5506 | if (!parent || d_really_is_negative(parent) || sb != parent->d_sb) |
12fcfd22 CM |
5507 | break; |
5508 | ||
44f714da | 5509 | if (IS_ROOT(parent)) { |
aefa6115 NB |
5510 | inode = BTRFS_I(d_inode(parent)); |
5511 | if (btrfs_must_commit_transaction(trans, inode)) | |
44f714da | 5512 | ret = 1; |
12fcfd22 | 5513 | break; |
44f714da | 5514 | } |
12fcfd22 | 5515 | |
6a912213 JB |
5516 | parent = dget_parent(parent); |
5517 | dput(old_parent); | |
5518 | old_parent = parent; | |
aefa6115 | 5519 | inode = BTRFS_I(d_inode(parent)); |
12fcfd22 CM |
5520 | |
5521 | } | |
6a912213 | 5522 | dput(old_parent); |
12fcfd22 | 5523 | out: |
e02119d5 CM |
5524 | return ret; |
5525 | } | |
5526 | ||
2f2ff0ee FM |
5527 | struct btrfs_dir_list { |
5528 | u64 ino; | |
5529 | struct list_head list; | |
5530 | }; | |
5531 | ||
5532 | /* | |
5533 | * Log the inodes of the new dentries of a directory. See log_dir_items() for | |
5534 | * details about the why it is needed. | |
5535 | * This is a recursive operation - if an existing dentry corresponds to a | |
5536 | * directory, that directory's new entries are logged too (same behaviour as | |
5537 | * ext3/4, xfs, f2fs, reiserfs, nilfs2). Note that when logging the inodes | |
5538 | * the dentries point to we do not lock their i_mutex, otherwise lockdep | |
5539 | * complains about the following circular lock dependency / possible deadlock: | |
5540 | * | |
5541 | * CPU0 CPU1 | |
5542 | * ---- ---- | |
5543 | * lock(&type->i_mutex_dir_key#3/2); | |
5544 | * lock(sb_internal#2); | |
5545 | * lock(&type->i_mutex_dir_key#3/2); | |
5546 | * lock(&sb->s_type->i_mutex_key#14); | |
5547 | * | |
5548 | * Where sb_internal is the lock (a counter that works as a lock) acquired by | |
5549 | * sb_start_intwrite() in btrfs_start_transaction(). | |
5550 | * Not locking i_mutex of the inodes is still safe because: | |
5551 | * | |
5552 | * 1) For regular files we log with a mode of LOG_INODE_EXISTS. It's possible | |
5553 | * that while logging the inode new references (names) are added or removed | |
5554 | * from the inode, leaving the logged inode item with a link count that does | |
5555 | * not match the number of logged inode reference items. This is fine because | |
5556 | * at log replay time we compute the real number of links and correct the | |
5557 | * link count in the inode item (see replay_one_buffer() and | |
5558 | * link_to_fixup_dir()); | |
5559 | * | |
5560 | * 2) For directories we log with a mode of LOG_INODE_ALL. It's possible that | |
5561 | * while logging the inode's items new items with keys BTRFS_DIR_ITEM_KEY and | |
5562 | * BTRFS_DIR_INDEX_KEY are added to fs/subvol tree and the logged inode item | |
5563 | * has a size that doesn't match the sum of the lengths of all the logged | |
5564 | * names. This does not result in a problem because if a dir_item key is | |
5565 | * logged but its matching dir_index key is not logged, at log replay time we | |
5566 | * don't use it to replay the respective name (see replay_one_name()). On the | |
5567 | * other hand if only the dir_index key ends up being logged, the respective | |
5568 | * name is added to the fs/subvol tree with both the dir_item and dir_index | |
5569 | * keys created (see replay_one_name()). | |
5570 | * The directory's inode item with a wrong i_size is not a problem as well, | |
5571 | * since we don't use it at log replay time to set the i_size in the inode | |
5572 | * item of the fs/subvol tree (see overwrite_item()). | |
5573 | */ | |
5574 | static int log_new_dir_dentries(struct btrfs_trans_handle *trans, | |
5575 | struct btrfs_root *root, | |
51cc0d32 | 5576 | struct btrfs_inode *start_inode, |
2f2ff0ee FM |
5577 | struct btrfs_log_ctx *ctx) |
5578 | { | |
0b246afa | 5579 | struct btrfs_fs_info *fs_info = root->fs_info; |
2f2ff0ee FM |
5580 | struct btrfs_root *log = root->log_root; |
5581 | struct btrfs_path *path; | |
5582 | LIST_HEAD(dir_list); | |
5583 | struct btrfs_dir_list *dir_elem; | |
5584 | int ret = 0; | |
5585 | ||
5586 | path = btrfs_alloc_path(); | |
5587 | if (!path) | |
5588 | return -ENOMEM; | |
5589 | ||
5590 | dir_elem = kmalloc(sizeof(*dir_elem), GFP_NOFS); | |
5591 | if (!dir_elem) { | |
5592 | btrfs_free_path(path); | |
5593 | return -ENOMEM; | |
5594 | } | |
51cc0d32 | 5595 | dir_elem->ino = btrfs_ino(start_inode); |
2f2ff0ee FM |
5596 | list_add_tail(&dir_elem->list, &dir_list); |
5597 | ||
5598 | while (!list_empty(&dir_list)) { | |
5599 | struct extent_buffer *leaf; | |
5600 | struct btrfs_key min_key; | |
5601 | int nritems; | |
5602 | int i; | |
5603 | ||
5604 | dir_elem = list_first_entry(&dir_list, struct btrfs_dir_list, | |
5605 | list); | |
5606 | if (ret) | |
5607 | goto next_dir_inode; | |
5608 | ||
5609 | min_key.objectid = dir_elem->ino; | |
5610 | min_key.type = BTRFS_DIR_ITEM_KEY; | |
5611 | min_key.offset = 0; | |
5612 | again: | |
5613 | btrfs_release_path(path); | |
5614 | ret = btrfs_search_forward(log, &min_key, path, trans->transid); | |
5615 | if (ret < 0) { | |
5616 | goto next_dir_inode; | |
5617 | } else if (ret > 0) { | |
5618 | ret = 0; | |
5619 | goto next_dir_inode; | |
5620 | } | |
5621 | ||
5622 | process_leaf: | |
5623 | leaf = path->nodes[0]; | |
5624 | nritems = btrfs_header_nritems(leaf); | |
5625 | for (i = path->slots[0]; i < nritems; i++) { | |
5626 | struct btrfs_dir_item *di; | |
5627 | struct btrfs_key di_key; | |
5628 | struct inode *di_inode; | |
5629 | struct btrfs_dir_list *new_dir_elem; | |
5630 | int log_mode = LOG_INODE_EXISTS; | |
5631 | int type; | |
5632 | ||
5633 | btrfs_item_key_to_cpu(leaf, &min_key, i); | |
5634 | if (min_key.objectid != dir_elem->ino || | |
5635 | min_key.type != BTRFS_DIR_ITEM_KEY) | |
5636 | goto next_dir_inode; | |
5637 | ||
5638 | di = btrfs_item_ptr(leaf, i, struct btrfs_dir_item); | |
5639 | type = btrfs_dir_type(leaf, di); | |
5640 | if (btrfs_dir_transid(leaf, di) < trans->transid && | |
5641 | type != BTRFS_FT_DIR) | |
5642 | continue; | |
5643 | btrfs_dir_item_key_to_cpu(leaf, di, &di_key); | |
5644 | if (di_key.type == BTRFS_ROOT_ITEM_KEY) | |
5645 | continue; | |
5646 | ||
ec125cfb | 5647 | btrfs_release_path(path); |
0202e83f | 5648 | di_inode = btrfs_iget(fs_info->sb, di_key.objectid, root); |
2f2ff0ee FM |
5649 | if (IS_ERR(di_inode)) { |
5650 | ret = PTR_ERR(di_inode); | |
5651 | goto next_dir_inode; | |
5652 | } | |
5653 | ||
0f8939b8 | 5654 | if (btrfs_inode_in_log(BTRFS_I(di_inode), trans->transid)) { |
410f954c | 5655 | btrfs_add_delayed_iput(di_inode); |
ec125cfb | 5656 | break; |
2f2ff0ee FM |
5657 | } |
5658 | ||
5659 | ctx->log_new_dentries = false; | |
3f9749f6 | 5660 | if (type == BTRFS_FT_DIR || type == BTRFS_FT_SYMLINK) |
2f2ff0ee | 5661 | log_mode = LOG_INODE_ALL; |
a59108a7 | 5662 | ret = btrfs_log_inode(trans, root, BTRFS_I(di_inode), |
48778179 | 5663 | log_mode, ctx); |
2be63d5c | 5664 | if (!ret && |
ab1717b2 | 5665 | btrfs_must_commit_transaction(trans, BTRFS_I(di_inode))) |
2be63d5c | 5666 | ret = 1; |
410f954c | 5667 | btrfs_add_delayed_iput(di_inode); |
2f2ff0ee FM |
5668 | if (ret) |
5669 | goto next_dir_inode; | |
5670 | if (ctx->log_new_dentries) { | |
5671 | new_dir_elem = kmalloc(sizeof(*new_dir_elem), | |
5672 | GFP_NOFS); | |
5673 | if (!new_dir_elem) { | |
5674 | ret = -ENOMEM; | |
5675 | goto next_dir_inode; | |
5676 | } | |
5677 | new_dir_elem->ino = di_key.objectid; | |
5678 | list_add_tail(&new_dir_elem->list, &dir_list); | |
5679 | } | |
5680 | break; | |
5681 | } | |
5682 | if (i == nritems) { | |
5683 | ret = btrfs_next_leaf(log, path); | |
5684 | if (ret < 0) { | |
5685 | goto next_dir_inode; | |
5686 | } else if (ret > 0) { | |
5687 | ret = 0; | |
5688 | goto next_dir_inode; | |
5689 | } | |
5690 | goto process_leaf; | |
5691 | } | |
5692 | if (min_key.offset < (u64)-1) { | |
5693 | min_key.offset++; | |
5694 | goto again; | |
5695 | } | |
5696 | next_dir_inode: | |
5697 | list_del(&dir_elem->list); | |
5698 | kfree(dir_elem); | |
5699 | } | |
5700 | ||
5701 | btrfs_free_path(path); | |
5702 | return ret; | |
5703 | } | |
5704 | ||
18aa0922 | 5705 | static int btrfs_log_all_parents(struct btrfs_trans_handle *trans, |
d0a0b78d | 5706 | struct btrfs_inode *inode, |
18aa0922 FM |
5707 | struct btrfs_log_ctx *ctx) |
5708 | { | |
3ffbd68c | 5709 | struct btrfs_fs_info *fs_info = trans->fs_info; |
18aa0922 FM |
5710 | int ret; |
5711 | struct btrfs_path *path; | |
5712 | struct btrfs_key key; | |
d0a0b78d NB |
5713 | struct btrfs_root *root = inode->root; |
5714 | const u64 ino = btrfs_ino(inode); | |
18aa0922 FM |
5715 | |
5716 | path = btrfs_alloc_path(); | |
5717 | if (!path) | |
5718 | return -ENOMEM; | |
5719 | path->skip_locking = 1; | |
5720 | path->search_commit_root = 1; | |
5721 | ||
5722 | key.objectid = ino; | |
5723 | key.type = BTRFS_INODE_REF_KEY; | |
5724 | key.offset = 0; | |
5725 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); | |
5726 | if (ret < 0) | |
5727 | goto out; | |
5728 | ||
5729 | while (true) { | |
5730 | struct extent_buffer *leaf = path->nodes[0]; | |
5731 | int slot = path->slots[0]; | |
5732 | u32 cur_offset = 0; | |
5733 | u32 item_size; | |
5734 | unsigned long ptr; | |
5735 | ||
5736 | if (slot >= btrfs_header_nritems(leaf)) { | |
5737 | ret = btrfs_next_leaf(root, path); | |
5738 | if (ret < 0) | |
5739 | goto out; | |
5740 | else if (ret > 0) | |
5741 | break; | |
5742 | continue; | |
5743 | } | |
5744 | ||
5745 | btrfs_item_key_to_cpu(leaf, &key, slot); | |
5746 | /* BTRFS_INODE_EXTREF_KEY is BTRFS_INODE_REF_KEY + 1 */ | |
5747 | if (key.objectid != ino || key.type > BTRFS_INODE_EXTREF_KEY) | |
5748 | break; | |
5749 | ||
5750 | item_size = btrfs_item_size_nr(leaf, slot); | |
5751 | ptr = btrfs_item_ptr_offset(leaf, slot); | |
5752 | while (cur_offset < item_size) { | |
5753 | struct btrfs_key inode_key; | |
5754 | struct inode *dir_inode; | |
5755 | ||
5756 | inode_key.type = BTRFS_INODE_ITEM_KEY; | |
5757 | inode_key.offset = 0; | |
5758 | ||
5759 | if (key.type == BTRFS_INODE_EXTREF_KEY) { | |
5760 | struct btrfs_inode_extref *extref; | |
5761 | ||
5762 | extref = (struct btrfs_inode_extref *) | |
5763 | (ptr + cur_offset); | |
5764 | inode_key.objectid = btrfs_inode_extref_parent( | |
5765 | leaf, extref); | |
5766 | cur_offset += sizeof(*extref); | |
5767 | cur_offset += btrfs_inode_extref_name_len(leaf, | |
5768 | extref); | |
5769 | } else { | |
5770 | inode_key.objectid = key.offset; | |
5771 | cur_offset = item_size; | |
5772 | } | |
5773 | ||
0202e83f DS |
5774 | dir_inode = btrfs_iget(fs_info->sb, inode_key.objectid, |
5775 | root); | |
0f375eed FM |
5776 | /* |
5777 | * If the parent inode was deleted, return an error to | |
5778 | * fallback to a transaction commit. This is to prevent | |
5779 | * getting an inode that was moved from one parent A to | |
5780 | * a parent B, got its former parent A deleted and then | |
5781 | * it got fsync'ed, from existing at both parents after | |
5782 | * a log replay (and the old parent still existing). | |
5783 | * Example: | |
5784 | * | |
5785 | * mkdir /mnt/A | |
5786 | * mkdir /mnt/B | |
5787 | * touch /mnt/B/bar | |
5788 | * sync | |
5789 | * mv /mnt/B/bar /mnt/A/bar | |
5790 | * mv -T /mnt/A /mnt/B | |
5791 | * fsync /mnt/B/bar | |
5792 | * <power fail> | |
5793 | * | |
5794 | * If we ignore the old parent B which got deleted, | |
5795 | * after a log replay we would have file bar linked | |
5796 | * at both parents and the old parent B would still | |
5797 | * exist. | |
5798 | */ | |
5799 | if (IS_ERR(dir_inode)) { | |
5800 | ret = PTR_ERR(dir_inode); | |
5801 | goto out; | |
5802 | } | |
18aa0922 | 5803 | |
657ed1aa FM |
5804 | if (ctx) |
5805 | ctx->log_new_dentries = false; | |
a59108a7 | 5806 | ret = btrfs_log_inode(trans, root, BTRFS_I(dir_inode), |
48778179 | 5807 | LOG_INODE_ALL, ctx); |
2be63d5c | 5808 | if (!ret && |
ab1717b2 | 5809 | btrfs_must_commit_transaction(trans, BTRFS_I(dir_inode))) |
2be63d5c | 5810 | ret = 1; |
657ed1aa FM |
5811 | if (!ret && ctx && ctx->log_new_dentries) |
5812 | ret = log_new_dir_dentries(trans, root, | |
f85b7379 | 5813 | BTRFS_I(dir_inode), ctx); |
410f954c | 5814 | btrfs_add_delayed_iput(dir_inode); |
18aa0922 FM |
5815 | if (ret) |
5816 | goto out; | |
5817 | } | |
5818 | path->slots[0]++; | |
5819 | } | |
5820 | ret = 0; | |
5821 | out: | |
5822 | btrfs_free_path(path); | |
5823 | return ret; | |
5824 | } | |
5825 | ||
b8aa330d FM |
5826 | static int log_new_ancestors(struct btrfs_trans_handle *trans, |
5827 | struct btrfs_root *root, | |
5828 | struct btrfs_path *path, | |
5829 | struct btrfs_log_ctx *ctx) | |
5830 | { | |
5831 | struct btrfs_key found_key; | |
5832 | ||
5833 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); | |
5834 | ||
5835 | while (true) { | |
5836 | struct btrfs_fs_info *fs_info = root->fs_info; | |
b8aa330d FM |
5837 | struct extent_buffer *leaf = path->nodes[0]; |
5838 | int slot = path->slots[0]; | |
5839 | struct btrfs_key search_key; | |
5840 | struct inode *inode; | |
0202e83f | 5841 | u64 ino; |
b8aa330d FM |
5842 | int ret = 0; |
5843 | ||
5844 | btrfs_release_path(path); | |
5845 | ||
0202e83f DS |
5846 | ino = found_key.offset; |
5847 | ||
b8aa330d FM |
5848 | search_key.objectid = found_key.offset; |
5849 | search_key.type = BTRFS_INODE_ITEM_KEY; | |
5850 | search_key.offset = 0; | |
0202e83f | 5851 | inode = btrfs_iget(fs_info->sb, ino, root); |
b8aa330d FM |
5852 | if (IS_ERR(inode)) |
5853 | return PTR_ERR(inode); | |
5854 | ||
4d6221d7 | 5855 | if (BTRFS_I(inode)->generation >= trans->transid) |
b8aa330d | 5856 | ret = btrfs_log_inode(trans, root, BTRFS_I(inode), |
48778179 | 5857 | LOG_INODE_EXISTS, ctx); |
410f954c | 5858 | btrfs_add_delayed_iput(inode); |
b8aa330d FM |
5859 | if (ret) |
5860 | return ret; | |
5861 | ||
5862 | if (search_key.objectid == BTRFS_FIRST_FREE_OBJECTID) | |
5863 | break; | |
5864 | ||
5865 | search_key.type = BTRFS_INODE_REF_KEY; | |
5866 | ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0); | |
5867 | if (ret < 0) | |
5868 | return ret; | |
5869 | ||
5870 | leaf = path->nodes[0]; | |
5871 | slot = path->slots[0]; | |
5872 | if (slot >= btrfs_header_nritems(leaf)) { | |
5873 | ret = btrfs_next_leaf(root, path); | |
5874 | if (ret < 0) | |
5875 | return ret; | |
5876 | else if (ret > 0) | |
5877 | return -ENOENT; | |
5878 | leaf = path->nodes[0]; | |
5879 | slot = path->slots[0]; | |
5880 | } | |
5881 | ||
5882 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
5883 | if (found_key.objectid != search_key.objectid || | |
5884 | found_key.type != BTRFS_INODE_REF_KEY) | |
5885 | return -ENOENT; | |
5886 | } | |
5887 | return 0; | |
5888 | } | |
5889 | ||
5890 | static int log_new_ancestors_fast(struct btrfs_trans_handle *trans, | |
5891 | struct btrfs_inode *inode, | |
5892 | struct dentry *parent, | |
5893 | struct btrfs_log_ctx *ctx) | |
5894 | { | |
5895 | struct btrfs_root *root = inode->root; | |
b8aa330d FM |
5896 | struct dentry *old_parent = NULL; |
5897 | struct super_block *sb = inode->vfs_inode.i_sb; | |
5898 | int ret = 0; | |
5899 | ||
5900 | while (true) { | |
5901 | if (!parent || d_really_is_negative(parent) || | |
5902 | sb != parent->d_sb) | |
5903 | break; | |
5904 | ||
5905 | inode = BTRFS_I(d_inode(parent)); | |
5906 | if (root != inode->root) | |
5907 | break; | |
5908 | ||
4d6221d7 | 5909 | if (inode->generation >= trans->transid) { |
b8aa330d | 5910 | ret = btrfs_log_inode(trans, root, inode, |
48778179 | 5911 | LOG_INODE_EXISTS, ctx); |
b8aa330d FM |
5912 | if (ret) |
5913 | break; | |
5914 | } | |
5915 | if (IS_ROOT(parent)) | |
5916 | break; | |
5917 | ||
5918 | parent = dget_parent(parent); | |
5919 | dput(old_parent); | |
5920 | old_parent = parent; | |
5921 | } | |
5922 | dput(old_parent); | |
5923 | ||
5924 | return ret; | |
5925 | } | |
5926 | ||
5927 | static int log_all_new_ancestors(struct btrfs_trans_handle *trans, | |
5928 | struct btrfs_inode *inode, | |
5929 | struct dentry *parent, | |
5930 | struct btrfs_log_ctx *ctx) | |
5931 | { | |
5932 | struct btrfs_root *root = inode->root; | |
5933 | const u64 ino = btrfs_ino(inode); | |
5934 | struct btrfs_path *path; | |
5935 | struct btrfs_key search_key; | |
5936 | int ret; | |
5937 | ||
5938 | /* | |
5939 | * For a single hard link case, go through a fast path that does not | |
5940 | * need to iterate the fs/subvolume tree. | |
5941 | */ | |
5942 | if (inode->vfs_inode.i_nlink < 2) | |
5943 | return log_new_ancestors_fast(trans, inode, parent, ctx); | |
5944 | ||
5945 | path = btrfs_alloc_path(); | |
5946 | if (!path) | |
5947 | return -ENOMEM; | |
5948 | ||
5949 | search_key.objectid = ino; | |
5950 | search_key.type = BTRFS_INODE_REF_KEY; | |
5951 | search_key.offset = 0; | |
5952 | again: | |
5953 | ret = btrfs_search_slot(NULL, root, &search_key, path, 0, 0); | |
5954 | if (ret < 0) | |
5955 | goto out; | |
5956 | if (ret == 0) | |
5957 | path->slots[0]++; | |
5958 | ||
5959 | while (true) { | |
5960 | struct extent_buffer *leaf = path->nodes[0]; | |
5961 | int slot = path->slots[0]; | |
5962 | struct btrfs_key found_key; | |
5963 | ||
5964 | if (slot >= btrfs_header_nritems(leaf)) { | |
5965 | ret = btrfs_next_leaf(root, path); | |
5966 | if (ret < 0) | |
5967 | goto out; | |
5968 | else if (ret > 0) | |
5969 | break; | |
5970 | continue; | |
5971 | } | |
5972 | ||
5973 | btrfs_item_key_to_cpu(leaf, &found_key, slot); | |
5974 | if (found_key.objectid != ino || | |
5975 | found_key.type > BTRFS_INODE_EXTREF_KEY) | |
5976 | break; | |
5977 | ||
5978 | /* | |
5979 | * Don't deal with extended references because they are rare | |
5980 | * cases and too complex to deal with (we would need to keep | |
5981 | * track of which subitem we are processing for each item in | |
5982 | * this loop, etc). So just return some error to fallback to | |
5983 | * a transaction commit. | |
5984 | */ | |
5985 | if (found_key.type == BTRFS_INODE_EXTREF_KEY) { | |
5986 | ret = -EMLINK; | |
5987 | goto out; | |
5988 | } | |
5989 | ||
5990 | /* | |
5991 | * Logging ancestors needs to do more searches on the fs/subvol | |
5992 | * tree, so it releases the path as needed to avoid deadlocks. | |
5993 | * Keep track of the last inode ref key and resume from that key | |
5994 | * after logging all new ancestors for the current hard link. | |
5995 | */ | |
5996 | memcpy(&search_key, &found_key, sizeof(search_key)); | |
5997 | ||
5998 | ret = log_new_ancestors(trans, root, path, ctx); | |
5999 | if (ret) | |
6000 | goto out; | |
6001 | btrfs_release_path(path); | |
6002 | goto again; | |
6003 | } | |
6004 | ret = 0; | |
6005 | out: | |
6006 | btrfs_free_path(path); | |
6007 | return ret; | |
6008 | } | |
6009 | ||
e02119d5 CM |
6010 | /* |
6011 | * helper function around btrfs_log_inode to make sure newly created | |
6012 | * parent directories also end up in the log. A minimal inode and backref | |
6013 | * only logging is done of any parent directories that are older than | |
6014 | * the last committed transaction | |
6015 | */ | |
48a3b636 | 6016 | static int btrfs_log_inode_parent(struct btrfs_trans_handle *trans, |
19df27a9 | 6017 | struct btrfs_inode *inode, |
49dae1bc | 6018 | struct dentry *parent, |
41a1eada | 6019 | int inode_only, |
8b050d35 | 6020 | struct btrfs_log_ctx *ctx) |
e02119d5 | 6021 | { |
f882274b | 6022 | struct btrfs_root *root = inode->root; |
0b246afa | 6023 | struct btrfs_fs_info *fs_info = root->fs_info; |
e02119d5 | 6024 | struct super_block *sb; |
12fcfd22 | 6025 | int ret = 0; |
0b246afa | 6026 | u64 last_committed = fs_info->last_trans_committed; |
2f2ff0ee | 6027 | bool log_dentries = false; |
12fcfd22 | 6028 | |
19df27a9 | 6029 | sb = inode->vfs_inode.i_sb; |
12fcfd22 | 6030 | |
0b246afa | 6031 | if (btrfs_test_opt(fs_info, NOTREELOG)) { |
3a5e1404 SW |
6032 | ret = 1; |
6033 | goto end_no_trans; | |
6034 | } | |
6035 | ||
995946dd MX |
6036 | /* |
6037 | * The prev transaction commit doesn't complete, we need do | |
6038 | * full commit by ourselves. | |
6039 | */ | |
0b246afa JM |
6040 | if (fs_info->last_trans_log_full_commit > |
6041 | fs_info->last_trans_committed) { | |
12fcfd22 CM |
6042 | ret = 1; |
6043 | goto end_no_trans; | |
6044 | } | |
6045 | ||
f882274b | 6046 | if (btrfs_root_refs(&root->root_item) == 0) { |
76dda93c YZ |
6047 | ret = 1; |
6048 | goto end_no_trans; | |
6049 | } | |
6050 | ||
19df27a9 NB |
6051 | ret = check_parent_dirs_for_sync(trans, inode, parent, sb, |
6052 | last_committed); | |
12fcfd22 CM |
6053 | if (ret) |
6054 | goto end_no_trans; | |
e02119d5 | 6055 | |
f2d72f42 FM |
6056 | /* |
6057 | * Skip already logged inodes or inodes corresponding to tmpfiles | |
6058 | * (since logging them is pointless, a link count of 0 means they | |
6059 | * will never be accessible). | |
6060 | */ | |
6061 | if (btrfs_inode_in_log(inode, trans->transid) || | |
6062 | inode->vfs_inode.i_nlink == 0) { | |
257c62e1 CM |
6063 | ret = BTRFS_NO_LOG_SYNC; |
6064 | goto end_no_trans; | |
6065 | } | |
6066 | ||
8b050d35 | 6067 | ret = start_log_trans(trans, root, ctx); |
4a500fd1 | 6068 | if (ret) |
e87ac136 | 6069 | goto end_no_trans; |
e02119d5 | 6070 | |
48778179 | 6071 | ret = btrfs_log_inode(trans, root, inode, inode_only, ctx); |
4a500fd1 YZ |
6072 | if (ret) |
6073 | goto end_trans; | |
12fcfd22 | 6074 | |
af4176b4 CM |
6075 | /* |
6076 | * for regular files, if its inode is already on disk, we don't | |
6077 | * have to worry about the parents at all. This is because | |
6078 | * we can use the last_unlink_trans field to record renames | |
6079 | * and other fun in this file. | |
6080 | */ | |
19df27a9 NB |
6081 | if (S_ISREG(inode->vfs_inode.i_mode) && |
6082 | inode->generation <= last_committed && | |
6083 | inode->last_unlink_trans <= last_committed) { | |
4a500fd1 YZ |
6084 | ret = 0; |
6085 | goto end_trans; | |
6086 | } | |
af4176b4 | 6087 | |
19df27a9 | 6088 | if (S_ISDIR(inode->vfs_inode.i_mode) && ctx && ctx->log_new_dentries) |
2f2ff0ee FM |
6089 | log_dentries = true; |
6090 | ||
18aa0922 | 6091 | /* |
01327610 | 6092 | * On unlink we must make sure all our current and old parent directory |
18aa0922 FM |
6093 | * inodes are fully logged. This is to prevent leaving dangling |
6094 | * directory index entries in directories that were our parents but are | |
6095 | * not anymore. Not doing this results in old parent directory being | |
6096 | * impossible to delete after log replay (rmdir will always fail with | |
6097 | * error -ENOTEMPTY). | |
6098 | * | |
6099 | * Example 1: | |
6100 | * | |
6101 | * mkdir testdir | |
6102 | * touch testdir/foo | |
6103 | * ln testdir/foo testdir/bar | |
6104 | * sync | |
6105 | * unlink testdir/bar | |
6106 | * xfs_io -c fsync testdir/foo | |
6107 | * <power failure> | |
6108 | * mount fs, triggers log replay | |
6109 | * | |
6110 | * If we don't log the parent directory (testdir), after log replay the | |
6111 | * directory still has an entry pointing to the file inode using the bar | |
6112 | * name, but a matching BTRFS_INODE_[REF|EXTREF]_KEY does not exist and | |
6113 | * the file inode has a link count of 1. | |
6114 | * | |
6115 | * Example 2: | |
6116 | * | |
6117 | * mkdir testdir | |
6118 | * touch foo | |
6119 | * ln foo testdir/foo2 | |
6120 | * ln foo testdir/foo3 | |
6121 | * sync | |
6122 | * unlink testdir/foo3 | |
6123 | * xfs_io -c fsync foo | |
6124 | * <power failure> | |
6125 | * mount fs, triggers log replay | |
6126 | * | |
6127 | * Similar as the first example, after log replay the parent directory | |
6128 | * testdir still has an entry pointing to the inode file with name foo3 | |
6129 | * but the file inode does not have a matching BTRFS_INODE_REF_KEY item | |
6130 | * and has a link count of 2. | |
6131 | */ | |
19df27a9 | 6132 | if (inode->last_unlink_trans > last_committed) { |
b8aa330d | 6133 | ret = btrfs_log_all_parents(trans, inode, ctx); |
18aa0922 FM |
6134 | if (ret) |
6135 | goto end_trans; | |
6136 | } | |
6137 | ||
b8aa330d FM |
6138 | ret = log_all_new_ancestors(trans, inode, parent, ctx); |
6139 | if (ret) | |
41bd6067 | 6140 | goto end_trans; |
76dda93c | 6141 | |
2f2ff0ee | 6142 | if (log_dentries) |
b8aa330d | 6143 | ret = log_new_dir_dentries(trans, root, inode, ctx); |
2f2ff0ee FM |
6144 | else |
6145 | ret = 0; | |
4a500fd1 YZ |
6146 | end_trans: |
6147 | if (ret < 0) { | |
90787766 | 6148 | btrfs_set_log_full_commit(trans); |
4a500fd1 YZ |
6149 | ret = 1; |
6150 | } | |
8b050d35 MX |
6151 | |
6152 | if (ret) | |
6153 | btrfs_remove_log_ctx(root, ctx); | |
12fcfd22 CM |
6154 | btrfs_end_log_trans(root); |
6155 | end_no_trans: | |
6156 | return ret; | |
e02119d5 CM |
6157 | } |
6158 | ||
6159 | /* | |
6160 | * it is not safe to log dentry if the chunk root has added new | |
6161 | * chunks. This returns 0 if the dentry was logged, and 1 otherwise. | |
6162 | * If this returns 1, you must commit the transaction to safely get your | |
6163 | * data on disk. | |
6164 | */ | |
6165 | int btrfs_log_dentry_safe(struct btrfs_trans_handle *trans, | |
e5b84f7a | 6166 | struct dentry *dentry, |
8b050d35 | 6167 | struct btrfs_log_ctx *ctx) |
e02119d5 | 6168 | { |
6a912213 JB |
6169 | struct dentry *parent = dget_parent(dentry); |
6170 | int ret; | |
6171 | ||
f882274b | 6172 | ret = btrfs_log_inode_parent(trans, BTRFS_I(d_inode(dentry)), parent, |
48778179 | 6173 | LOG_INODE_ALL, ctx); |
6a912213 JB |
6174 | dput(parent); |
6175 | ||
6176 | return ret; | |
e02119d5 CM |
6177 | } |
6178 | ||
6179 | /* | |
6180 | * should be called during mount to recover any replay any log trees | |
6181 | * from the FS | |
6182 | */ | |
6183 | int btrfs_recover_log_trees(struct btrfs_root *log_root_tree) | |
6184 | { | |
6185 | int ret; | |
6186 | struct btrfs_path *path; | |
6187 | struct btrfs_trans_handle *trans; | |
6188 | struct btrfs_key key; | |
6189 | struct btrfs_key found_key; | |
e02119d5 CM |
6190 | struct btrfs_root *log; |
6191 | struct btrfs_fs_info *fs_info = log_root_tree->fs_info; | |
6192 | struct walk_control wc = { | |
6193 | .process_func = process_one_buffer, | |
430a6626 | 6194 | .stage = LOG_WALK_PIN_ONLY, |
e02119d5 CM |
6195 | }; |
6196 | ||
e02119d5 | 6197 | path = btrfs_alloc_path(); |
db5b493a TI |
6198 | if (!path) |
6199 | return -ENOMEM; | |
6200 | ||
afcdd129 | 6201 | set_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags); |
e02119d5 | 6202 | |
4a500fd1 | 6203 | trans = btrfs_start_transaction(fs_info->tree_root, 0); |
79787eaa JM |
6204 | if (IS_ERR(trans)) { |
6205 | ret = PTR_ERR(trans); | |
6206 | goto error; | |
6207 | } | |
e02119d5 CM |
6208 | |
6209 | wc.trans = trans; | |
6210 | wc.pin = 1; | |
6211 | ||
db5b493a | 6212 | ret = walk_log_tree(trans, log_root_tree, &wc); |
79787eaa | 6213 | if (ret) { |
5d163e0e JM |
6214 | btrfs_handle_fs_error(fs_info, ret, |
6215 | "Failed to pin buffers while recovering log root tree."); | |
79787eaa JM |
6216 | goto error; |
6217 | } | |
e02119d5 CM |
6218 | |
6219 | again: | |
6220 | key.objectid = BTRFS_TREE_LOG_OBJECTID; | |
6221 | key.offset = (u64)-1; | |
962a298f | 6222 | key.type = BTRFS_ROOT_ITEM_KEY; |
e02119d5 | 6223 | |
d397712b | 6224 | while (1) { |
e02119d5 | 6225 | ret = btrfs_search_slot(NULL, log_root_tree, &key, path, 0, 0); |
79787eaa JM |
6226 | |
6227 | if (ret < 0) { | |
34d97007 | 6228 | btrfs_handle_fs_error(fs_info, ret, |
79787eaa JM |
6229 | "Couldn't find tree log root."); |
6230 | goto error; | |
6231 | } | |
e02119d5 CM |
6232 | if (ret > 0) { |
6233 | if (path->slots[0] == 0) | |
6234 | break; | |
6235 | path->slots[0]--; | |
6236 | } | |
6237 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
6238 | path->slots[0]); | |
b3b4aa74 | 6239 | btrfs_release_path(path); |
e02119d5 CM |
6240 | if (found_key.objectid != BTRFS_TREE_LOG_OBJECTID) |
6241 | break; | |
6242 | ||
62a2c73e | 6243 | log = btrfs_read_tree_root(log_root_tree, &found_key); |
79787eaa JM |
6244 | if (IS_ERR(log)) { |
6245 | ret = PTR_ERR(log); | |
34d97007 | 6246 | btrfs_handle_fs_error(fs_info, ret, |
79787eaa JM |
6247 | "Couldn't read tree log root."); |
6248 | goto error; | |
6249 | } | |
e02119d5 | 6250 | |
56e9357a DS |
6251 | wc.replay_dest = btrfs_get_fs_root(fs_info, found_key.offset, |
6252 | true); | |
79787eaa JM |
6253 | if (IS_ERR(wc.replay_dest)) { |
6254 | ret = PTR_ERR(wc.replay_dest); | |
9bc574de JB |
6255 | |
6256 | /* | |
6257 | * We didn't find the subvol, likely because it was | |
6258 | * deleted. This is ok, simply skip this log and go to | |
6259 | * the next one. | |
6260 | * | |
6261 | * We need to exclude the root because we can't have | |
6262 | * other log replays overwriting this log as we'll read | |
6263 | * it back in a few more times. This will keep our | |
6264 | * block from being modified, and we'll just bail for | |
6265 | * each subsequent pass. | |
6266 | */ | |
6267 | if (ret == -ENOENT) | |
9fce5704 | 6268 | ret = btrfs_pin_extent_for_log_replay(trans, |
9bc574de JB |
6269 | log->node->start, |
6270 | log->node->len); | |
00246528 | 6271 | btrfs_put_root(log); |
9bc574de JB |
6272 | |
6273 | if (!ret) | |
6274 | goto next; | |
5d163e0e JM |
6275 | btrfs_handle_fs_error(fs_info, ret, |
6276 | "Couldn't read target root for tree log recovery."); | |
79787eaa JM |
6277 | goto error; |
6278 | } | |
e02119d5 | 6279 | |
07d400a6 | 6280 | wc.replay_dest->log_root = log; |
5d4f98a2 | 6281 | btrfs_record_root_in_trans(trans, wc.replay_dest); |
e02119d5 | 6282 | ret = walk_log_tree(trans, log, &wc); |
e02119d5 | 6283 | |
b50c6e25 | 6284 | if (!ret && wc.stage == LOG_WALK_REPLAY_ALL) { |
e02119d5 CM |
6285 | ret = fixup_inode_link_counts(trans, wc.replay_dest, |
6286 | path); | |
e02119d5 CM |
6287 | } |
6288 | ||
900c9981 LB |
6289 | if (!ret && wc.stage == LOG_WALK_REPLAY_ALL) { |
6290 | struct btrfs_root *root = wc.replay_dest; | |
6291 | ||
6292 | btrfs_release_path(path); | |
6293 | ||
6294 | /* | |
6295 | * We have just replayed everything, and the highest | |
6296 | * objectid of fs roots probably has changed in case | |
6297 | * some inode_item's got replayed. | |
6298 | * | |
6299 | * root->objectid_mutex is not acquired as log replay | |
6300 | * could only happen during mount. | |
6301 | */ | |
6302 | ret = btrfs_find_highest_objectid(root, | |
6303 | &root->highest_objectid); | |
6304 | } | |
6305 | ||
07d400a6 | 6306 | wc.replay_dest->log_root = NULL; |
00246528 | 6307 | btrfs_put_root(wc.replay_dest); |
00246528 | 6308 | btrfs_put_root(log); |
e02119d5 | 6309 | |
b50c6e25 JB |
6310 | if (ret) |
6311 | goto error; | |
9bc574de | 6312 | next: |
e02119d5 CM |
6313 | if (found_key.offset == 0) |
6314 | break; | |
9bc574de | 6315 | key.offset = found_key.offset - 1; |
e02119d5 | 6316 | } |
b3b4aa74 | 6317 | btrfs_release_path(path); |
e02119d5 CM |
6318 | |
6319 | /* step one is to pin it all, step two is to replay just inodes */ | |
6320 | if (wc.pin) { | |
6321 | wc.pin = 0; | |
6322 | wc.process_func = replay_one_buffer; | |
6323 | wc.stage = LOG_WALK_REPLAY_INODES; | |
6324 | goto again; | |
6325 | } | |
6326 | /* step three is to replay everything */ | |
6327 | if (wc.stage < LOG_WALK_REPLAY_ALL) { | |
6328 | wc.stage++; | |
6329 | goto again; | |
6330 | } | |
6331 | ||
6332 | btrfs_free_path(path); | |
6333 | ||
abefa55a | 6334 | /* step 4: commit the transaction, which also unpins the blocks */ |
3a45bb20 | 6335 | ret = btrfs_commit_transaction(trans); |
abefa55a JB |
6336 | if (ret) |
6337 | return ret; | |
6338 | ||
e02119d5 | 6339 | log_root_tree->log_root = NULL; |
afcdd129 | 6340 | clear_bit(BTRFS_FS_LOG_RECOVERING, &fs_info->flags); |
00246528 | 6341 | btrfs_put_root(log_root_tree); |
79787eaa | 6342 | |
abefa55a | 6343 | return 0; |
79787eaa | 6344 | error: |
b50c6e25 | 6345 | if (wc.trans) |
3a45bb20 | 6346 | btrfs_end_transaction(wc.trans); |
79787eaa JM |
6347 | btrfs_free_path(path); |
6348 | return ret; | |
e02119d5 | 6349 | } |
12fcfd22 CM |
6350 | |
6351 | /* | |
6352 | * there are some corner cases where we want to force a full | |
6353 | * commit instead of allowing a directory to be logged. | |
6354 | * | |
6355 | * They revolve around files there were unlinked from the directory, and | |
6356 | * this function updates the parent directory so that a full commit is | |
6357 | * properly done if it is fsync'd later after the unlinks are done. | |
2be63d5c FM |
6358 | * |
6359 | * Must be called before the unlink operations (updates to the subvolume tree, | |
6360 | * inodes, etc) are done. | |
12fcfd22 CM |
6361 | */ |
6362 | void btrfs_record_unlink_dir(struct btrfs_trans_handle *trans, | |
4176bdbf | 6363 | struct btrfs_inode *dir, struct btrfs_inode *inode, |
12fcfd22 CM |
6364 | int for_rename) |
6365 | { | |
af4176b4 CM |
6366 | /* |
6367 | * when we're logging a file, if it hasn't been renamed | |
6368 | * or unlinked, and its inode is fully committed on disk, | |
6369 | * we don't have to worry about walking up the directory chain | |
6370 | * to log its parents. | |
6371 | * | |
6372 | * So, we use the last_unlink_trans field to put this transid | |
6373 | * into the file. When the file is logged we check it and | |
6374 | * don't log the parents if the file is fully on disk. | |
6375 | */ | |
4176bdbf NB |
6376 | mutex_lock(&inode->log_mutex); |
6377 | inode->last_unlink_trans = trans->transid; | |
6378 | mutex_unlock(&inode->log_mutex); | |
af4176b4 | 6379 | |
12fcfd22 CM |
6380 | /* |
6381 | * if this directory was already logged any new | |
6382 | * names for this file/dir will get recorded | |
6383 | */ | |
4176bdbf | 6384 | if (dir->logged_trans == trans->transid) |
12fcfd22 CM |
6385 | return; |
6386 | ||
6387 | /* | |
6388 | * if the inode we're about to unlink was logged, | |
6389 | * the log will be properly updated for any new names | |
6390 | */ | |
4176bdbf | 6391 | if (inode->logged_trans == trans->transid) |
12fcfd22 CM |
6392 | return; |
6393 | ||
6394 | /* | |
6395 | * when renaming files across directories, if the directory | |
6396 | * there we're unlinking from gets fsync'd later on, there's | |
6397 | * no way to find the destination directory later and fsync it | |
6398 | * properly. So, we have to be conservative and force commits | |
6399 | * so the new name gets discovered. | |
6400 | */ | |
6401 | if (for_rename) | |
6402 | goto record; | |
6403 | ||
6404 | /* we can safely do the unlink without any special recording */ | |
6405 | return; | |
6406 | ||
6407 | record: | |
4176bdbf NB |
6408 | mutex_lock(&dir->log_mutex); |
6409 | dir->last_unlink_trans = trans->transid; | |
6410 | mutex_unlock(&dir->log_mutex); | |
1ec9a1ae FM |
6411 | } |
6412 | ||
6413 | /* | |
6414 | * Make sure that if someone attempts to fsync the parent directory of a deleted | |
6415 | * snapshot, it ends up triggering a transaction commit. This is to guarantee | |
6416 | * that after replaying the log tree of the parent directory's root we will not | |
6417 | * see the snapshot anymore and at log replay time we will not see any log tree | |
6418 | * corresponding to the deleted snapshot's root, which could lead to replaying | |
6419 | * it after replaying the log tree of the parent directory (which would replay | |
6420 | * the snapshot delete operation). | |
2be63d5c FM |
6421 | * |
6422 | * Must be called before the actual snapshot destroy operation (updates to the | |
6423 | * parent root and tree of tree roots trees, etc) are done. | |
1ec9a1ae FM |
6424 | */ |
6425 | void btrfs_record_snapshot_destroy(struct btrfs_trans_handle *trans, | |
43663557 | 6426 | struct btrfs_inode *dir) |
1ec9a1ae | 6427 | { |
43663557 NB |
6428 | mutex_lock(&dir->log_mutex); |
6429 | dir->last_unlink_trans = trans->transid; | |
6430 | mutex_unlock(&dir->log_mutex); | |
12fcfd22 CM |
6431 | } |
6432 | ||
6433 | /* | |
6434 | * Call this after adding a new name for a file and it will properly | |
6435 | * update the log to reflect the new name. | |
12fcfd22 | 6436 | */ |
75b463d2 | 6437 | void btrfs_log_new_name(struct btrfs_trans_handle *trans, |
9ca5fbfb | 6438 | struct btrfs_inode *inode, struct btrfs_inode *old_dir, |
75b463d2 | 6439 | struct dentry *parent) |
12fcfd22 | 6440 | { |
75b463d2 | 6441 | struct btrfs_log_ctx ctx; |
12fcfd22 | 6442 | |
af4176b4 CM |
6443 | /* |
6444 | * this will force the logging code to walk the dentry chain | |
6445 | * up for the file | |
6446 | */ | |
9a6509c4 | 6447 | if (!S_ISDIR(inode->vfs_inode.i_mode)) |
9ca5fbfb | 6448 | inode->last_unlink_trans = trans->transid; |
af4176b4 | 6449 | |
12fcfd22 CM |
6450 | /* |
6451 | * if this inode hasn't been logged and directory we're renaming it | |
6452 | * from hasn't been logged, we don't need to log it | |
6453 | */ | |
de53d892 FM |
6454 | if (inode->logged_trans < trans->transid && |
6455 | (!old_dir || old_dir->logged_trans < trans->transid)) | |
75b463d2 | 6456 | return; |
12fcfd22 | 6457 | |
75b463d2 FM |
6458 | btrfs_init_log_ctx(&ctx, &inode->vfs_inode); |
6459 | ctx.logging_new_name = true; | |
6460 | /* | |
6461 | * We don't care about the return value. If we fail to log the new name | |
6462 | * then we know the next attempt to sync the log will fallback to a full | |
6463 | * transaction commit (due to a call to btrfs_set_log_full_commit()), so | |
6464 | * we don't need to worry about getting a log committed that has an | |
6465 | * inconsistent state after a rename operation. | |
6466 | */ | |
48778179 | 6467 | btrfs_log_inode_parent(trans, inode, parent, LOG_INODE_EXISTS, &ctx); |
12fcfd22 CM |
6468 | } |
6469 |