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1 | /* | |
2 | * fs/f2fs/namei.c | |
3 | * | |
4 | * Copyright (c) 2012 Samsung Electronics Co., Ltd. | |
5 | * http://www.samsung.com/ | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/fs.h> | |
12 | #include <linux/f2fs_fs.h> | |
13 | #include <linux/pagemap.h> | |
14 | #include <linux/sched.h> | |
15 | #include <linux/ctype.h> | |
16 | #include <linux/dcache.h> | |
17 | #include <linux/namei.h> | |
18 | ||
19 | #include "f2fs.h" | |
20 | #include "node.h" | |
21 | #include "xattr.h" | |
22 | #include "acl.h" | |
23 | #include <trace/events/f2fs.h> | |
24 | ||
25 | static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode) | |
26 | { | |
27 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
28 | nid_t ino; | |
29 | struct inode *inode; | |
30 | bool nid_free = false; | |
31 | int err; | |
32 | ||
33 | inode = new_inode(dir->i_sb); | |
34 | if (!inode) | |
35 | return ERR_PTR(-ENOMEM); | |
36 | ||
37 | f2fs_lock_op(sbi); | |
38 | if (!alloc_nid(sbi, &ino)) { | |
39 | f2fs_unlock_op(sbi); | |
40 | err = -ENOSPC; | |
41 | goto fail; | |
42 | } | |
43 | f2fs_unlock_op(sbi); | |
44 | ||
45 | inode_init_owner(inode, dir, mode); | |
46 | ||
47 | inode->i_ino = ino; | |
48 | inode->i_blocks = 0; | |
49 | inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME; | |
50 | inode->i_generation = sbi->s_next_generation++; | |
51 | ||
52 | err = insert_inode_locked(inode); | |
53 | if (err) { | |
54 | err = -EINVAL; | |
55 | nid_free = true; | |
56 | goto out; | |
57 | } | |
58 | ||
59 | /* If the directory encrypted, then we should encrypt the inode. */ | |
60 | if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode)) | |
61 | f2fs_set_encrypted_inode(inode); | |
62 | ||
63 | if (f2fs_may_inline_data(inode)) | |
64 | set_inode_flag(F2FS_I(inode), FI_INLINE_DATA); | |
65 | if (f2fs_may_inline_dentry(inode)) | |
66 | set_inode_flag(F2FS_I(inode), FI_INLINE_DENTRY); | |
67 | ||
68 | stat_inc_inline_inode(inode); | |
69 | stat_inc_inline_dir(inode); | |
70 | ||
71 | trace_f2fs_new_inode(inode, 0); | |
72 | mark_inode_dirty(inode); | |
73 | return inode; | |
74 | ||
75 | out: | |
76 | clear_nlink(inode); | |
77 | unlock_new_inode(inode); | |
78 | fail: | |
79 | trace_f2fs_new_inode(inode, err); | |
80 | make_bad_inode(inode); | |
81 | iput(inode); | |
82 | if (nid_free) | |
83 | alloc_nid_failed(sbi, ino); | |
84 | return ERR_PTR(err); | |
85 | } | |
86 | ||
87 | static int is_multimedia_file(const unsigned char *s, const char *sub) | |
88 | { | |
89 | size_t slen = strlen(s); | |
90 | size_t sublen = strlen(sub); | |
91 | ||
92 | if (sublen > slen) | |
93 | return 0; | |
94 | ||
95 | return !strncasecmp(s + slen - sublen, sub, sublen); | |
96 | } | |
97 | ||
98 | /* | |
99 | * Set multimedia files as cold files for hot/cold data separation | |
100 | */ | |
101 | static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode, | |
102 | const unsigned char *name) | |
103 | { | |
104 | int i; | |
105 | __u8 (*extlist)[8] = sbi->raw_super->extension_list; | |
106 | ||
107 | int count = le32_to_cpu(sbi->raw_super->extension_count); | |
108 | for (i = 0; i < count; i++) { | |
109 | if (is_multimedia_file(name, extlist[i])) { | |
110 | file_set_cold(inode); | |
111 | break; | |
112 | } | |
113 | } | |
114 | } | |
115 | ||
116 | static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode, | |
117 | bool excl) | |
118 | { | |
119 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
120 | struct inode *inode; | |
121 | nid_t ino = 0; | |
122 | int err; | |
123 | ||
124 | f2fs_balance_fs(sbi); | |
125 | ||
126 | inode = f2fs_new_inode(dir, mode); | |
127 | if (IS_ERR(inode)) | |
128 | return PTR_ERR(inode); | |
129 | ||
130 | if (!test_opt(sbi, DISABLE_EXT_IDENTIFY)) | |
131 | set_cold_files(sbi, inode, dentry->d_name.name); | |
132 | ||
133 | inode->i_op = &f2fs_file_inode_operations; | |
134 | inode->i_fop = &f2fs_file_operations; | |
135 | inode->i_mapping->a_ops = &f2fs_dblock_aops; | |
136 | ino = inode->i_ino; | |
137 | ||
138 | f2fs_lock_op(sbi); | |
139 | err = f2fs_add_link(dentry, inode); | |
140 | if (err) | |
141 | goto out; | |
142 | f2fs_unlock_op(sbi); | |
143 | ||
144 | alloc_nid_done(sbi, ino); | |
145 | ||
146 | d_instantiate(dentry, inode); | |
147 | unlock_new_inode(inode); | |
148 | ||
149 | if (IS_DIRSYNC(dir)) | |
150 | f2fs_sync_fs(sbi->sb, 1); | |
151 | return 0; | |
152 | out: | |
153 | handle_failed_inode(inode); | |
154 | return err; | |
155 | } | |
156 | ||
157 | static int f2fs_link(struct dentry *old_dentry, struct inode *dir, | |
158 | struct dentry *dentry) | |
159 | { | |
160 | struct inode *inode = d_inode(old_dentry); | |
161 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
162 | int err; | |
163 | ||
164 | if (f2fs_encrypted_inode(dir) && | |
165 | !f2fs_is_child_context_consistent_with_parent(dir, inode)) | |
166 | return -EPERM; | |
167 | ||
168 | f2fs_balance_fs(sbi); | |
169 | ||
170 | inode->i_ctime = CURRENT_TIME; | |
171 | ihold(inode); | |
172 | ||
173 | set_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
174 | f2fs_lock_op(sbi); | |
175 | err = f2fs_add_link(dentry, inode); | |
176 | if (err) | |
177 | goto out; | |
178 | f2fs_unlock_op(sbi); | |
179 | ||
180 | d_instantiate(dentry, inode); | |
181 | ||
182 | if (IS_DIRSYNC(dir)) | |
183 | f2fs_sync_fs(sbi->sb, 1); | |
184 | return 0; | |
185 | out: | |
186 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
187 | iput(inode); | |
188 | f2fs_unlock_op(sbi); | |
189 | return err; | |
190 | } | |
191 | ||
192 | struct dentry *f2fs_get_parent(struct dentry *child) | |
193 | { | |
194 | struct qstr dotdot = QSTR_INIT("..", 2); | |
195 | unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot); | |
196 | if (!ino) | |
197 | return ERR_PTR(-ENOENT); | |
198 | return d_obtain_alias(f2fs_iget(d_inode(child)->i_sb, ino)); | |
199 | } | |
200 | ||
201 | static int __recover_dot_dentries(struct inode *dir, nid_t pino) | |
202 | { | |
203 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
204 | struct qstr dot = QSTR_INIT(".", 1); | |
205 | struct qstr dotdot = QSTR_INIT("..", 2); | |
206 | struct f2fs_dir_entry *de; | |
207 | struct page *page; | |
208 | int err = 0; | |
209 | ||
210 | f2fs_lock_op(sbi); | |
211 | ||
212 | de = f2fs_find_entry(dir, &dot, &page); | |
213 | if (de) { | |
214 | f2fs_dentry_kunmap(dir, page); | |
215 | f2fs_put_page(page, 0); | |
216 | } else { | |
217 | err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR); | |
218 | if (err) | |
219 | goto out; | |
220 | } | |
221 | ||
222 | de = f2fs_find_entry(dir, &dotdot, &page); | |
223 | if (de) { | |
224 | f2fs_dentry_kunmap(dir, page); | |
225 | f2fs_put_page(page, 0); | |
226 | } else { | |
227 | err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR); | |
228 | } | |
229 | out: | |
230 | if (!err) { | |
231 | clear_inode_flag(F2FS_I(dir), FI_INLINE_DOTS); | |
232 | mark_inode_dirty(dir); | |
233 | } | |
234 | ||
235 | f2fs_unlock_op(sbi); | |
236 | return err; | |
237 | } | |
238 | ||
239 | static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry, | |
240 | unsigned int flags) | |
241 | { | |
242 | struct inode *inode = NULL; | |
243 | struct f2fs_dir_entry *de; | |
244 | struct page *page; | |
245 | nid_t ino; | |
246 | int err = 0; | |
247 | ||
248 | if (dentry->d_name.len > F2FS_NAME_LEN) | |
249 | return ERR_PTR(-ENAMETOOLONG); | |
250 | ||
251 | de = f2fs_find_entry(dir, &dentry->d_name, &page); | |
252 | if (!de) | |
253 | return d_splice_alias(inode, dentry); | |
254 | ||
255 | ino = le32_to_cpu(de->ino); | |
256 | f2fs_dentry_kunmap(dir, page); | |
257 | f2fs_put_page(page, 0); | |
258 | ||
259 | inode = f2fs_iget(dir->i_sb, ino); | |
260 | if (IS_ERR(inode)) | |
261 | return ERR_CAST(inode); | |
262 | ||
263 | if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode) && | |
264 | !f2fs_is_child_context_consistent_with_parent(dir, inode)) { | |
265 | iput(inode); | |
266 | f2fs_msg(inode->i_sb, KERN_WARNING, | |
267 | "Inconsistent encryption contexts: %lu/%lu\n", | |
268 | (unsigned long)dir->i_ino, | |
269 | (unsigned long)inode->i_ino); | |
270 | return ERR_PTR(-EPERM); | |
271 | } | |
272 | ||
273 | if (f2fs_has_inline_dots(inode)) { | |
274 | err = __recover_dot_dentries(inode, dir->i_ino); | |
275 | if (err) | |
276 | goto err_out; | |
277 | } | |
278 | return d_splice_alias(inode, dentry); | |
279 | ||
280 | err_out: | |
281 | iget_failed(inode); | |
282 | return ERR_PTR(err); | |
283 | } | |
284 | ||
285 | static int f2fs_unlink(struct inode *dir, struct dentry *dentry) | |
286 | { | |
287 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
288 | struct inode *inode = d_inode(dentry); | |
289 | struct f2fs_dir_entry *de; | |
290 | struct page *page; | |
291 | int err = -ENOENT; | |
292 | ||
293 | trace_f2fs_unlink_enter(dir, dentry); | |
294 | f2fs_balance_fs(sbi); | |
295 | ||
296 | de = f2fs_find_entry(dir, &dentry->d_name, &page); | |
297 | if (!de) | |
298 | goto fail; | |
299 | ||
300 | f2fs_lock_op(sbi); | |
301 | err = acquire_orphan_inode(sbi); | |
302 | if (err) { | |
303 | f2fs_unlock_op(sbi); | |
304 | f2fs_dentry_kunmap(dir, page); | |
305 | f2fs_put_page(page, 0); | |
306 | goto fail; | |
307 | } | |
308 | f2fs_delete_entry(de, page, dir, inode); | |
309 | f2fs_unlock_op(sbi); | |
310 | ||
311 | /* In order to evict this inode, we set it dirty */ | |
312 | mark_inode_dirty(inode); | |
313 | ||
314 | if (IS_DIRSYNC(dir)) | |
315 | f2fs_sync_fs(sbi->sb, 1); | |
316 | fail: | |
317 | trace_f2fs_unlink_exit(inode, err); | |
318 | return err; | |
319 | } | |
320 | ||
321 | static void *f2fs_follow_link(struct dentry *dentry, struct nameidata *nd) | |
322 | { | |
323 | struct page *page = page_follow_link_light(dentry, nd); | |
324 | ||
325 | if (IS_ERR_OR_NULL(page)) | |
326 | return page; | |
327 | ||
328 | /* this is broken symlink case */ | |
329 | if (*nd_get_link(nd) == 0) { | |
330 | page_put_link(dentry, nd, page); | |
331 | return ERR_PTR(-ENOENT); | |
332 | } | |
333 | return page; | |
334 | } | |
335 | ||
336 | static int f2fs_symlink(struct inode *dir, struct dentry *dentry, | |
337 | const char *symname) | |
338 | { | |
339 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
340 | struct inode *inode; | |
341 | size_t symlen = strlen(symname) + 1; | |
342 | int err; | |
343 | ||
344 | f2fs_balance_fs(sbi); | |
345 | ||
346 | inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO); | |
347 | if (IS_ERR(inode)) | |
348 | return PTR_ERR(inode); | |
349 | ||
350 | inode->i_op = &f2fs_symlink_inode_operations; | |
351 | inode->i_mapping->a_ops = &f2fs_dblock_aops; | |
352 | ||
353 | f2fs_lock_op(sbi); | |
354 | err = f2fs_add_link(dentry, inode); | |
355 | if (err) | |
356 | goto out; | |
357 | f2fs_unlock_op(sbi); | |
358 | ||
359 | err = page_symlink(inode, symname, symlen); | |
360 | alloc_nid_done(sbi, inode->i_ino); | |
361 | ||
362 | d_instantiate(dentry, inode); | |
363 | unlock_new_inode(inode); | |
364 | ||
365 | /* | |
366 | * Let's flush symlink data in order to avoid broken symlink as much as | |
367 | * possible. Nevertheless, fsyncing is the best way, but there is no | |
368 | * way to get a file descriptor in order to flush that. | |
369 | * | |
370 | * Note that, it needs to do dir->fsync to make this recoverable. | |
371 | * If the symlink path is stored into inline_data, there is no | |
372 | * performance regression. | |
373 | */ | |
374 | filemap_write_and_wait_range(inode->i_mapping, 0, symlen - 1); | |
375 | ||
376 | if (IS_DIRSYNC(dir)) | |
377 | f2fs_sync_fs(sbi->sb, 1); | |
378 | return err; | |
379 | out: | |
380 | handle_failed_inode(inode); | |
381 | return err; | |
382 | } | |
383 | ||
384 | static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) | |
385 | { | |
386 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
387 | struct inode *inode; | |
388 | int err; | |
389 | ||
390 | f2fs_balance_fs(sbi); | |
391 | ||
392 | inode = f2fs_new_inode(dir, S_IFDIR | mode); | |
393 | if (IS_ERR(inode)) | |
394 | return PTR_ERR(inode); | |
395 | ||
396 | inode->i_op = &f2fs_dir_inode_operations; | |
397 | inode->i_fop = &f2fs_dir_operations; | |
398 | inode->i_mapping->a_ops = &f2fs_dblock_aops; | |
399 | mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO); | |
400 | ||
401 | set_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
402 | f2fs_lock_op(sbi); | |
403 | err = f2fs_add_link(dentry, inode); | |
404 | if (err) | |
405 | goto out_fail; | |
406 | f2fs_unlock_op(sbi); | |
407 | ||
408 | alloc_nid_done(sbi, inode->i_ino); | |
409 | ||
410 | d_instantiate(dentry, inode); | |
411 | unlock_new_inode(inode); | |
412 | ||
413 | if (IS_DIRSYNC(dir)) | |
414 | f2fs_sync_fs(sbi->sb, 1); | |
415 | return 0; | |
416 | ||
417 | out_fail: | |
418 | clear_inode_flag(F2FS_I(inode), FI_INC_LINK); | |
419 | handle_failed_inode(inode); | |
420 | return err; | |
421 | } | |
422 | ||
423 | static int f2fs_rmdir(struct inode *dir, struct dentry *dentry) | |
424 | { | |
425 | struct inode *inode = d_inode(dentry); | |
426 | if (f2fs_empty_dir(inode)) | |
427 | return f2fs_unlink(dir, dentry); | |
428 | return -ENOTEMPTY; | |
429 | } | |
430 | ||
431 | static int f2fs_mknod(struct inode *dir, struct dentry *dentry, | |
432 | umode_t mode, dev_t rdev) | |
433 | { | |
434 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
435 | struct inode *inode; | |
436 | int err = 0; | |
437 | ||
438 | if (!new_valid_dev(rdev)) | |
439 | return -EINVAL; | |
440 | ||
441 | f2fs_balance_fs(sbi); | |
442 | ||
443 | inode = f2fs_new_inode(dir, mode); | |
444 | if (IS_ERR(inode)) | |
445 | return PTR_ERR(inode); | |
446 | ||
447 | init_special_inode(inode, inode->i_mode, rdev); | |
448 | inode->i_op = &f2fs_special_inode_operations; | |
449 | ||
450 | f2fs_lock_op(sbi); | |
451 | err = f2fs_add_link(dentry, inode); | |
452 | if (err) | |
453 | goto out; | |
454 | f2fs_unlock_op(sbi); | |
455 | ||
456 | alloc_nid_done(sbi, inode->i_ino); | |
457 | ||
458 | d_instantiate(dentry, inode); | |
459 | unlock_new_inode(inode); | |
460 | ||
461 | if (IS_DIRSYNC(dir)) | |
462 | f2fs_sync_fs(sbi->sb, 1); | |
463 | return 0; | |
464 | out: | |
465 | handle_failed_inode(inode); | |
466 | return err; | |
467 | } | |
468 | ||
469 | static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry, | |
470 | struct inode *new_dir, struct dentry *new_dentry) | |
471 | { | |
472 | struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); | |
473 | struct inode *old_inode = d_inode(old_dentry); | |
474 | struct inode *new_inode = d_inode(new_dentry); | |
475 | struct page *old_dir_page; | |
476 | struct page *old_page, *new_page; | |
477 | struct f2fs_dir_entry *old_dir_entry = NULL; | |
478 | struct f2fs_dir_entry *old_entry; | |
479 | struct f2fs_dir_entry *new_entry; | |
480 | int err = -ENOENT; | |
481 | ||
482 | if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) && | |
483 | !f2fs_is_child_context_consistent_with_parent(new_dir, | |
484 | old_inode)) { | |
485 | err = -EPERM; | |
486 | goto out; | |
487 | } | |
488 | ||
489 | f2fs_balance_fs(sbi); | |
490 | ||
491 | old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); | |
492 | if (!old_entry) | |
493 | goto out; | |
494 | ||
495 | if (S_ISDIR(old_inode->i_mode)) { | |
496 | err = -EIO; | |
497 | old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page); | |
498 | if (!old_dir_entry) | |
499 | goto out_old; | |
500 | } | |
501 | ||
502 | if (new_inode) { | |
503 | ||
504 | err = -ENOTEMPTY; | |
505 | if (old_dir_entry && !f2fs_empty_dir(new_inode)) | |
506 | goto out_dir; | |
507 | ||
508 | err = -ENOENT; | |
509 | new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, | |
510 | &new_page); | |
511 | if (!new_entry) | |
512 | goto out_dir; | |
513 | ||
514 | f2fs_lock_op(sbi); | |
515 | ||
516 | err = acquire_orphan_inode(sbi); | |
517 | if (err) | |
518 | goto put_out_dir; | |
519 | ||
520 | if (update_dent_inode(old_inode, &new_dentry->d_name)) { | |
521 | release_orphan_inode(sbi); | |
522 | goto put_out_dir; | |
523 | } | |
524 | ||
525 | f2fs_set_link(new_dir, new_entry, new_page, old_inode); | |
526 | ||
527 | new_inode->i_ctime = CURRENT_TIME; | |
528 | down_write(&F2FS_I(new_inode)->i_sem); | |
529 | if (old_dir_entry) | |
530 | drop_nlink(new_inode); | |
531 | drop_nlink(new_inode); | |
532 | up_write(&F2FS_I(new_inode)->i_sem); | |
533 | ||
534 | mark_inode_dirty(new_inode); | |
535 | ||
536 | if (!new_inode->i_nlink) | |
537 | add_orphan_inode(sbi, new_inode->i_ino); | |
538 | else | |
539 | release_orphan_inode(sbi); | |
540 | ||
541 | update_inode_page(old_inode); | |
542 | update_inode_page(new_inode); | |
543 | } else { | |
544 | f2fs_lock_op(sbi); | |
545 | ||
546 | err = f2fs_add_link(new_dentry, old_inode); | |
547 | if (err) { | |
548 | f2fs_unlock_op(sbi); | |
549 | goto out_dir; | |
550 | } | |
551 | ||
552 | if (old_dir_entry) { | |
553 | inc_nlink(new_dir); | |
554 | update_inode_page(new_dir); | |
555 | } | |
556 | } | |
557 | ||
558 | down_write(&F2FS_I(old_inode)->i_sem); | |
559 | file_lost_pino(old_inode); | |
560 | up_write(&F2FS_I(old_inode)->i_sem); | |
561 | ||
562 | old_inode->i_ctime = CURRENT_TIME; | |
563 | mark_inode_dirty(old_inode); | |
564 | ||
565 | f2fs_delete_entry(old_entry, old_page, old_dir, NULL); | |
566 | ||
567 | if (old_dir_entry) { | |
568 | if (old_dir != new_dir) { | |
569 | f2fs_set_link(old_inode, old_dir_entry, | |
570 | old_dir_page, new_dir); | |
571 | update_inode_page(old_inode); | |
572 | } else { | |
573 | f2fs_dentry_kunmap(old_inode, old_dir_page); | |
574 | f2fs_put_page(old_dir_page, 0); | |
575 | } | |
576 | drop_nlink(old_dir); | |
577 | mark_inode_dirty(old_dir); | |
578 | update_inode_page(old_dir); | |
579 | } | |
580 | ||
581 | f2fs_unlock_op(sbi); | |
582 | ||
583 | if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) | |
584 | f2fs_sync_fs(sbi->sb, 1); | |
585 | return 0; | |
586 | ||
587 | put_out_dir: | |
588 | f2fs_unlock_op(sbi); | |
589 | f2fs_dentry_kunmap(new_dir, new_page); | |
590 | f2fs_put_page(new_page, 0); | |
591 | out_dir: | |
592 | if (old_dir_entry) { | |
593 | f2fs_dentry_kunmap(old_inode, old_dir_page); | |
594 | f2fs_put_page(old_dir_page, 0); | |
595 | } | |
596 | out_old: | |
597 | f2fs_dentry_kunmap(old_dir, old_page); | |
598 | f2fs_put_page(old_page, 0); | |
599 | out: | |
600 | return err; | |
601 | } | |
602 | ||
603 | static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry, | |
604 | struct inode *new_dir, struct dentry *new_dentry) | |
605 | { | |
606 | struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir); | |
607 | struct inode *old_inode = d_inode(old_dentry); | |
608 | struct inode *new_inode = d_inode(new_dentry); | |
609 | struct page *old_dir_page, *new_dir_page; | |
610 | struct page *old_page, *new_page; | |
611 | struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL; | |
612 | struct f2fs_dir_entry *old_entry, *new_entry; | |
613 | int old_nlink = 0, new_nlink = 0; | |
614 | int err = -ENOENT; | |
615 | ||
616 | f2fs_balance_fs(sbi); | |
617 | ||
618 | old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page); | |
619 | if (!old_entry) | |
620 | goto out; | |
621 | ||
622 | new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page); | |
623 | if (!new_entry) | |
624 | goto out_old; | |
625 | ||
626 | /* prepare for updating ".." directory entry info later */ | |
627 | if (old_dir != new_dir) { | |
628 | if (S_ISDIR(old_inode->i_mode)) { | |
629 | err = -EIO; | |
630 | old_dir_entry = f2fs_parent_dir(old_inode, | |
631 | &old_dir_page); | |
632 | if (!old_dir_entry) | |
633 | goto out_new; | |
634 | } | |
635 | ||
636 | if (S_ISDIR(new_inode->i_mode)) { | |
637 | err = -EIO; | |
638 | new_dir_entry = f2fs_parent_dir(new_inode, | |
639 | &new_dir_page); | |
640 | if (!new_dir_entry) | |
641 | goto out_old_dir; | |
642 | } | |
643 | } | |
644 | ||
645 | /* | |
646 | * If cross rename between file and directory those are not | |
647 | * in the same directory, we will inc nlink of file's parent | |
648 | * later, so we should check upper boundary of its nlink. | |
649 | */ | |
650 | if ((!old_dir_entry || !new_dir_entry) && | |
651 | old_dir_entry != new_dir_entry) { | |
652 | old_nlink = old_dir_entry ? -1 : 1; | |
653 | new_nlink = -old_nlink; | |
654 | err = -EMLINK; | |
655 | if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) || | |
656 | (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX)) | |
657 | goto out_new_dir; | |
658 | } | |
659 | ||
660 | f2fs_lock_op(sbi); | |
661 | ||
662 | err = update_dent_inode(old_inode, &new_dentry->d_name); | |
663 | if (err) | |
664 | goto out_unlock; | |
665 | ||
666 | err = update_dent_inode(new_inode, &old_dentry->d_name); | |
667 | if (err) | |
668 | goto out_undo; | |
669 | ||
670 | /* update ".." directory entry info of old dentry */ | |
671 | if (old_dir_entry) | |
672 | f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir); | |
673 | ||
674 | /* update ".." directory entry info of new dentry */ | |
675 | if (new_dir_entry) | |
676 | f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir); | |
677 | ||
678 | /* update directory entry info of old dir inode */ | |
679 | f2fs_set_link(old_dir, old_entry, old_page, new_inode); | |
680 | ||
681 | down_write(&F2FS_I(old_inode)->i_sem); | |
682 | file_lost_pino(old_inode); | |
683 | up_write(&F2FS_I(old_inode)->i_sem); | |
684 | ||
685 | update_inode_page(old_inode); | |
686 | ||
687 | old_dir->i_ctime = CURRENT_TIME; | |
688 | if (old_nlink) { | |
689 | down_write(&F2FS_I(old_dir)->i_sem); | |
690 | if (old_nlink < 0) | |
691 | drop_nlink(old_dir); | |
692 | else | |
693 | inc_nlink(old_dir); | |
694 | up_write(&F2FS_I(old_dir)->i_sem); | |
695 | } | |
696 | mark_inode_dirty(old_dir); | |
697 | update_inode_page(old_dir); | |
698 | ||
699 | /* update directory entry info of new dir inode */ | |
700 | f2fs_set_link(new_dir, new_entry, new_page, old_inode); | |
701 | ||
702 | down_write(&F2FS_I(new_inode)->i_sem); | |
703 | file_lost_pino(new_inode); | |
704 | up_write(&F2FS_I(new_inode)->i_sem); | |
705 | ||
706 | update_inode_page(new_inode); | |
707 | ||
708 | new_dir->i_ctime = CURRENT_TIME; | |
709 | if (new_nlink) { | |
710 | down_write(&F2FS_I(new_dir)->i_sem); | |
711 | if (new_nlink < 0) | |
712 | drop_nlink(new_dir); | |
713 | else | |
714 | inc_nlink(new_dir); | |
715 | up_write(&F2FS_I(new_dir)->i_sem); | |
716 | } | |
717 | mark_inode_dirty(new_dir); | |
718 | update_inode_page(new_dir); | |
719 | ||
720 | f2fs_unlock_op(sbi); | |
721 | ||
722 | if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir)) | |
723 | f2fs_sync_fs(sbi->sb, 1); | |
724 | return 0; | |
725 | out_undo: | |
726 | /* Still we may fail to recover name info of f2fs_inode here */ | |
727 | update_dent_inode(old_inode, &old_dentry->d_name); | |
728 | out_unlock: | |
729 | f2fs_unlock_op(sbi); | |
730 | out_new_dir: | |
731 | if (new_dir_entry) { | |
732 | f2fs_dentry_kunmap(new_inode, new_dir_page); | |
733 | f2fs_put_page(new_dir_page, 0); | |
734 | } | |
735 | out_old_dir: | |
736 | if (old_dir_entry) { | |
737 | f2fs_dentry_kunmap(old_inode, old_dir_page); | |
738 | f2fs_put_page(old_dir_page, 0); | |
739 | } | |
740 | out_new: | |
741 | f2fs_dentry_kunmap(new_dir, new_page); | |
742 | f2fs_put_page(new_page, 0); | |
743 | out_old: | |
744 | f2fs_dentry_kunmap(old_dir, old_page); | |
745 | f2fs_put_page(old_page, 0); | |
746 | out: | |
747 | return err; | |
748 | } | |
749 | ||
750 | static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry, | |
751 | struct inode *new_dir, struct dentry *new_dentry, | |
752 | unsigned int flags) | |
753 | { | |
754 | if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE)) | |
755 | return -EINVAL; | |
756 | ||
757 | if (flags & RENAME_EXCHANGE) { | |
758 | return f2fs_cross_rename(old_dir, old_dentry, | |
759 | new_dir, new_dentry); | |
760 | } | |
761 | /* | |
762 | * VFS has already handled the new dentry existence case, | |
763 | * here, we just deal with "RENAME_NOREPLACE" as regular rename. | |
764 | */ | |
765 | return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry); | |
766 | } | |
767 | ||
768 | static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) | |
769 | { | |
770 | struct f2fs_sb_info *sbi = F2FS_I_SB(dir); | |
771 | struct inode *inode; | |
772 | int err; | |
773 | ||
774 | inode = f2fs_new_inode(dir, mode); | |
775 | if (IS_ERR(inode)) | |
776 | return PTR_ERR(inode); | |
777 | ||
778 | inode->i_op = &f2fs_file_inode_operations; | |
779 | inode->i_fop = &f2fs_file_operations; | |
780 | inode->i_mapping->a_ops = &f2fs_dblock_aops; | |
781 | ||
782 | f2fs_lock_op(sbi); | |
783 | err = acquire_orphan_inode(sbi); | |
784 | if (err) | |
785 | goto out; | |
786 | ||
787 | err = f2fs_do_tmpfile(inode, dir); | |
788 | if (err) | |
789 | goto release_out; | |
790 | ||
791 | /* | |
792 | * add this non-linked tmpfile to orphan list, in this way we could | |
793 | * remove all unused data of tmpfile after abnormal power-off. | |
794 | */ | |
795 | add_orphan_inode(sbi, inode->i_ino); | |
796 | f2fs_unlock_op(sbi); | |
797 | ||
798 | alloc_nid_done(sbi, inode->i_ino); | |
799 | ||
800 | d_tmpfile(dentry, inode); | |
801 | unlock_new_inode(inode); | |
802 | return 0; | |
803 | ||
804 | release_out: | |
805 | release_orphan_inode(sbi); | |
806 | out: | |
807 | handle_failed_inode(inode); | |
808 | return err; | |
809 | } | |
810 | ||
811 | const struct inode_operations f2fs_dir_inode_operations = { | |
812 | .create = f2fs_create, | |
813 | .lookup = f2fs_lookup, | |
814 | .link = f2fs_link, | |
815 | .unlink = f2fs_unlink, | |
816 | .symlink = f2fs_symlink, | |
817 | .mkdir = f2fs_mkdir, | |
818 | .rmdir = f2fs_rmdir, | |
819 | .mknod = f2fs_mknod, | |
820 | .rename2 = f2fs_rename2, | |
821 | .tmpfile = f2fs_tmpfile, | |
822 | .getattr = f2fs_getattr, | |
823 | .setattr = f2fs_setattr, | |
824 | .get_acl = f2fs_get_acl, | |
825 | .set_acl = f2fs_set_acl, | |
826 | #ifdef CONFIG_F2FS_FS_XATTR | |
827 | .setxattr = generic_setxattr, | |
828 | .getxattr = generic_getxattr, | |
829 | .listxattr = f2fs_listxattr, | |
830 | .removexattr = generic_removexattr, | |
831 | #endif | |
832 | }; | |
833 | ||
834 | const struct inode_operations f2fs_symlink_inode_operations = { | |
835 | .readlink = generic_readlink, | |
836 | .follow_link = f2fs_follow_link, | |
837 | .put_link = page_put_link, | |
838 | .getattr = f2fs_getattr, | |
839 | .setattr = f2fs_setattr, | |
840 | #ifdef CONFIG_F2FS_FS_XATTR | |
841 | .setxattr = generic_setxattr, | |
842 | .getxattr = generic_getxattr, | |
843 | .listxattr = f2fs_listxattr, | |
844 | .removexattr = generic_removexattr, | |
845 | #endif | |
846 | }; | |
847 | ||
848 | const struct inode_operations f2fs_special_inode_operations = { | |
849 | .getattr = f2fs_getattr, | |
850 | .setattr = f2fs_setattr, | |
851 | .get_acl = f2fs_get_acl, | |
852 | .set_acl = f2fs_set_acl, | |
853 | #ifdef CONFIG_F2FS_FS_XATTR | |
854 | .setxattr = generic_setxattr, | |
855 | .getxattr = generic_getxattr, | |
856 | .listxattr = f2fs_listxattr, | |
857 | .removexattr = generic_removexattr, | |
858 | #endif | |
859 | }; |