projects / deliverable / linux.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
f2fs: detect error of update_dent_inode in ->rename
[deliverable/linux.git] / fs / f2fs / namei.c
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 fail;
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 (test_opt(sbi, INLINE_DATA) && 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 f2fs_init_extent_tree(inode, NULL);
69
70 stat_inc_inline_xattr(inode);
71 stat_inc_inline_inode(inode);
72 stat_inc_inline_dir(inode);
73
74 trace_f2fs_new_inode(inode, 0);
75 mark_inode_dirty(inode);
76 return inode;
77
78 fail:
79 trace_f2fs_new_inode(inode, err);
80 make_bad_inode(inode);
81 if (nid_free)
82 set_inode_flag(F2FS_I(inode), FI_FREE_NID);
83 iput(inode);
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 /*
93 * filename format of multimedia file should be defined as:
94 * "filename + '.' + extension".
95 */
96 if (slen < sublen + 2)
97 return 0;
98
99 if (s[slen - sublen - 1] != '.')
100 return 0;
101
102 return !strncasecmp(s + slen - sublen, sub, sublen);
103 }
104
105 /*
106 * Set multimedia files as cold files for hot/cold data separation
107 */
108 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
109 const unsigned char *name)
110 {
111 int i;
112 __u8 (*extlist)[8] = sbi->raw_super->extension_list;
113
114 int count = le32_to_cpu(sbi->raw_super->extension_count);
115 for (i = 0; i < count; i++) {
116 if (is_multimedia_file(name, extlist[i])) {
117 file_set_cold(inode);
118 break;
119 }
120 }
121 }
122
123 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
124 bool excl)
125 {
126 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
127 struct inode *inode;
128 nid_t ino = 0;
129 int err;
130
131 inode = f2fs_new_inode(dir, mode);
132 if (IS_ERR(inode))
133 return PTR_ERR(inode);
134
135 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
136 set_cold_files(sbi, inode, dentry->d_name.name);
137
138 inode->i_op = &f2fs_file_inode_operations;
139 inode->i_fop = &f2fs_file_operations;
140 inode->i_mapping->a_ops = &f2fs_dblock_aops;
141 ino = inode->i_ino;
142
143 f2fs_balance_fs(sbi, true);
144
145 f2fs_lock_op(sbi);
146 err = f2fs_add_link(dentry, inode);
147 if (err)
148 goto out;
149 f2fs_unlock_op(sbi);
150
151 alloc_nid_done(sbi, ino);
152
153 d_instantiate(dentry, inode);
154 unlock_new_inode(inode);
155
156 if (IS_DIRSYNC(dir))
157 f2fs_sync_fs(sbi->sb, 1);
158 return 0;
159 out:
160 handle_failed_inode(inode);
161 return err;
162 }
163
164 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
165 struct dentry *dentry)
166 {
167 struct inode *inode = d_inode(old_dentry);
168 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
169 int err;
170
171 if (f2fs_encrypted_inode(dir) &&
172 !f2fs_is_child_context_consistent_with_parent(dir, inode))
173 return -EPERM;
174
175 f2fs_balance_fs(sbi, true);
176
177 inode->i_ctime = CURRENT_TIME;
178 ihold(inode);
179
180 set_inode_flag(F2FS_I(inode), FI_INC_LINK);
181 f2fs_lock_op(sbi);
182 err = f2fs_add_link(dentry, inode);
183 if (err)
184 goto out;
185 f2fs_unlock_op(sbi);
186
187 d_instantiate(dentry, inode);
188
189 if (IS_DIRSYNC(dir))
190 f2fs_sync_fs(sbi->sb, 1);
191 return 0;
192 out:
193 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
194 iput(inode);
195 f2fs_unlock_op(sbi);
196 return err;
197 }
198
199 struct dentry *f2fs_get_parent(struct dentry *child)
200 {
201 struct qstr dotdot = QSTR_INIT("..", 2);
202 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot);
203 if (!ino)
204 return ERR_PTR(-ENOENT);
205 return d_obtain_alias(f2fs_iget(d_inode(child)->i_sb, ino));
206 }
207
208 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
209 {
210 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
211 struct qstr dot = QSTR_INIT(".", 1);
212 struct qstr dotdot = QSTR_INIT("..", 2);
213 struct f2fs_dir_entry *de;
214 struct page *page;
215 int err = 0;
216
217 if (f2fs_readonly(sbi->sb)) {
218 f2fs_msg(sbi->sb, KERN_INFO,
219 "skip recovering inline_dots inode (ino:%lu, pino:%u) "
220 "in readonly mountpoint", dir->i_ino, pino);
221 return 0;
222 }
223
224 f2fs_balance_fs(sbi, true);
225
226 f2fs_lock_op(sbi);
227
228 de = f2fs_find_entry(dir, &dot, &page);
229 if (de) {
230 f2fs_dentry_kunmap(dir, page);
231 f2fs_put_page(page, 0);
232 } else {
233 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
234 if (err)
235 goto out;
236 }
237
238 de = f2fs_find_entry(dir, &dotdot, &page);
239 if (de) {
240 f2fs_dentry_kunmap(dir, page);
241 f2fs_put_page(page, 0);
242 } else {
243 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
244 }
245 out:
246 if (!err) {
247 clear_inode_flag(F2FS_I(dir), FI_INLINE_DOTS);
248 mark_inode_dirty(dir);
249 }
250
251 f2fs_unlock_op(sbi);
252 return err;
253 }
254
255 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
256 unsigned int flags)
257 {
258 struct inode *inode = NULL;
259 struct f2fs_dir_entry *de;
260 struct page *page;
261 nid_t ino;
262 int err = 0;
263
264 if (dentry->d_name.len > F2FS_NAME_LEN)
265 return ERR_PTR(-ENAMETOOLONG);
266
267 de = f2fs_find_entry(dir, &dentry->d_name, &page);
268 if (!de)
269 return d_splice_alias(inode, dentry);
270
271 ino = le32_to_cpu(de->ino);
272 f2fs_dentry_kunmap(dir, page);
273 f2fs_put_page(page, 0);
274
275 inode = f2fs_iget(dir->i_sb, ino);
276 if (IS_ERR(inode))
277 return ERR_CAST(inode);
278
279 if (f2fs_has_inline_dots(inode)) {
280 err = __recover_dot_dentries(inode, dir->i_ino);
281 if (err)
282 goto err_out;
283 }
284 return d_splice_alias(inode, dentry);
285
286 err_out:
287 iget_failed(inode);
288 return ERR_PTR(err);
289 }
290
291 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
292 {
293 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
294 struct inode *inode = d_inode(dentry);
295 struct f2fs_dir_entry *de;
296 struct page *page;
297 int err = -ENOENT;
298
299 trace_f2fs_unlink_enter(dir, dentry);
300
301 de = f2fs_find_entry(dir, &dentry->d_name, &page);
302 if (!de)
303 goto fail;
304
305 f2fs_balance_fs(sbi, true);
306
307 f2fs_lock_op(sbi);
308 err = acquire_orphan_inode(sbi);
309 if (err) {
310 f2fs_unlock_op(sbi);
311 f2fs_dentry_kunmap(dir, page);
312 f2fs_put_page(page, 0);
313 goto fail;
314 }
315 f2fs_delete_entry(de, page, dir, inode);
316 f2fs_unlock_op(sbi);
317
318 /* In order to evict this inode, we set it dirty */
319 mark_inode_dirty(inode);
320
321 if (IS_DIRSYNC(dir))
322 f2fs_sync_fs(sbi->sb, 1);
323 fail:
324 trace_f2fs_unlink_exit(inode, err);
325 return err;
326 }
327
328 static const char *f2fs_get_link(struct dentry *dentry,
329 struct inode *inode,
330 struct delayed_call *done)
331 {
332 const char *link = page_get_link(dentry, inode, done);
333 if (!IS_ERR(link) && !*link) {
334 /* this is broken symlink case */
335 do_delayed_call(done);
336 clear_delayed_call(done);
337 link = ERR_PTR(-ENOENT);
338 }
339 return link;
340 }
341
342 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
343 const char *symname)
344 {
345 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
346 struct inode *inode;
347 size_t len = strlen(symname);
348 struct f2fs_str disk_link = FSTR_INIT((char *)symname, len + 1);
349 struct f2fs_encrypted_symlink_data *sd = NULL;
350 int err;
351
352 if (f2fs_encrypted_inode(dir)) {
353 err = f2fs_get_encryption_info(dir);
354 if (err)
355 return err;
356
357 if (!f2fs_encrypted_inode(dir))
358 return -EPERM;
359
360 disk_link.len = (f2fs_fname_encrypted_size(dir, len) +
361 sizeof(struct f2fs_encrypted_symlink_data));
362 }
363
364 if (disk_link.len > dir->i_sb->s_blocksize)
365 return -ENAMETOOLONG;
366
367 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
368 if (IS_ERR(inode))
369 return PTR_ERR(inode);
370
371 if (f2fs_encrypted_inode(inode))
372 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
373 else
374 inode->i_op = &f2fs_symlink_inode_operations;
375 inode_nohighmem(inode);
376 inode->i_mapping->a_ops = &f2fs_dblock_aops;
377
378 f2fs_balance_fs(sbi, true);
379
380 f2fs_lock_op(sbi);
381 err = f2fs_add_link(dentry, inode);
382 if (err)
383 goto out;
384 f2fs_unlock_op(sbi);
385 alloc_nid_done(sbi, inode->i_ino);
386
387 if (f2fs_encrypted_inode(inode)) {
388 struct qstr istr = QSTR_INIT(symname, len);
389 struct f2fs_str ostr;
390
391 sd = kzalloc(disk_link.len, GFP_NOFS);
392 if (!sd) {
393 err = -ENOMEM;
394 goto err_out;
395 }
396
397 err = f2fs_get_encryption_info(inode);
398 if (err)
399 goto err_out;
400
401 if (!f2fs_encrypted_inode(inode)) {
402 err = -EPERM;
403 goto err_out;
404 }
405
406 ostr.name = sd->encrypted_path;
407 ostr.len = disk_link.len;
408 err = f2fs_fname_usr_to_disk(inode, &istr, &ostr);
409 if (err < 0)
410 goto err_out;
411
412 sd->len = cpu_to_le16(ostr.len);
413 disk_link.name = (char *)sd;
414 }
415
416 err = page_symlink(inode, disk_link.name, disk_link.len);
417
418 err_out:
419 d_instantiate(dentry, inode);
420 unlock_new_inode(inode);
421
422 /*
423 * Let's flush symlink data in order to avoid broken symlink as much as
424 * possible. Nevertheless, fsyncing is the best way, but there is no
425 * way to get a file descriptor in order to flush that.
426 *
427 * Note that, it needs to do dir->fsync to make this recoverable.
428 * If the symlink path is stored into inline_data, there is no
429 * performance regression.
430 */
431 if (!err) {
432 filemap_write_and_wait_range(inode->i_mapping, 0,
433 disk_link.len - 1);
434
435 if (IS_DIRSYNC(dir))
436 f2fs_sync_fs(sbi->sb, 1);
437 } else {
438 f2fs_unlink(dir, dentry);
439 }
440
441 kfree(sd);
442 return err;
443 out:
444 handle_failed_inode(inode);
445 return err;
446 }
447
448 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
449 {
450 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
451 struct inode *inode;
452 int err;
453
454 inode = f2fs_new_inode(dir, S_IFDIR | mode);
455 if (IS_ERR(inode))
456 return PTR_ERR(inode);
457
458 inode->i_op = &f2fs_dir_inode_operations;
459 inode->i_fop = &f2fs_dir_operations;
460 inode->i_mapping->a_ops = &f2fs_dblock_aops;
461 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
462
463 f2fs_balance_fs(sbi, true);
464
465 set_inode_flag(F2FS_I(inode), FI_INC_LINK);
466 f2fs_lock_op(sbi);
467 err = f2fs_add_link(dentry, inode);
468 if (err)
469 goto out_fail;
470 f2fs_unlock_op(sbi);
471
472 alloc_nid_done(sbi, inode->i_ino);
473
474 d_instantiate(dentry, inode);
475 unlock_new_inode(inode);
476
477 if (IS_DIRSYNC(dir))
478 f2fs_sync_fs(sbi->sb, 1);
479 return 0;
480
481 out_fail:
482 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
483 handle_failed_inode(inode);
484 return err;
485 }
486
487 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
488 {
489 struct inode *inode = d_inode(dentry);
490 if (f2fs_empty_dir(inode))
491 return f2fs_unlink(dir, dentry);
492 return -ENOTEMPTY;
493 }
494
495 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
496 umode_t mode, dev_t rdev)
497 {
498 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
499 struct inode *inode;
500 int err = 0;
501
502 inode = f2fs_new_inode(dir, mode);
503 if (IS_ERR(inode))
504 return PTR_ERR(inode);
505
506 init_special_inode(inode, inode->i_mode, rdev);
507 inode->i_op = &f2fs_special_inode_operations;
508
509 f2fs_balance_fs(sbi, true);
510
511 f2fs_lock_op(sbi);
512 err = f2fs_add_link(dentry, inode);
513 if (err)
514 goto out;
515 f2fs_unlock_op(sbi);
516
517 alloc_nid_done(sbi, inode->i_ino);
518
519 d_instantiate(dentry, inode);
520 unlock_new_inode(inode);
521
522 if (IS_DIRSYNC(dir))
523 f2fs_sync_fs(sbi->sb, 1);
524 return 0;
525 out:
526 handle_failed_inode(inode);
527 return err;
528 }
529
530 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
531 umode_t mode, struct inode **whiteout)
532 {
533 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
534 struct inode *inode;
535 int err;
536
537 inode = f2fs_new_inode(dir, mode);
538 if (IS_ERR(inode))
539 return PTR_ERR(inode);
540
541 if (whiteout) {
542 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
543 inode->i_op = &f2fs_special_inode_operations;
544 } else {
545 inode->i_op = &f2fs_file_inode_operations;
546 inode->i_fop = &f2fs_file_operations;
547 inode->i_mapping->a_ops = &f2fs_dblock_aops;
548 }
549
550 f2fs_balance_fs(sbi, true);
551
552 f2fs_lock_op(sbi);
553 err = acquire_orphan_inode(sbi);
554 if (err)
555 goto out;
556
557 err = f2fs_do_tmpfile(inode, dir);
558 if (err)
559 goto release_out;
560
561 /*
562 * add this non-linked tmpfile to orphan list, in this way we could
563 * remove all unused data of tmpfile after abnormal power-off.
564 */
565 add_orphan_inode(sbi, inode->i_ino);
566 f2fs_unlock_op(sbi);
567
568 alloc_nid_done(sbi, inode->i_ino);
569
570 if (whiteout) {
571 inode_dec_link_count(inode);
572 *whiteout = inode;
573 } else {
574 d_tmpfile(dentry, inode);
575 }
576 unlock_new_inode(inode);
577 return 0;
578
579 release_out:
580 release_orphan_inode(sbi);
581 out:
582 handle_failed_inode(inode);
583 return err;
584 }
585
586 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
587 {
588 if (f2fs_encrypted_inode(dir)) {
589 int err = f2fs_get_encryption_info(dir);
590 if (err)
591 return err;
592 }
593
594 return __f2fs_tmpfile(dir, dentry, mode, NULL);
595 }
596
597 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
598 {
599 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
600 }
601
602 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
603 struct inode *new_dir, struct dentry *new_dentry,
604 unsigned int flags)
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 inode *whiteout = NULL;
610 struct page *old_dir_page;
611 struct page *old_page, *new_page = NULL;
612 struct f2fs_dir_entry *old_dir_entry = NULL;
613 struct f2fs_dir_entry *old_entry;
614 struct f2fs_dir_entry *new_entry;
615 int err = -ENOENT;
616
617 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
618 !f2fs_is_child_context_consistent_with_parent(new_dir,
619 old_inode)) {
620 err = -EPERM;
621 goto out;
622 }
623
624 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
625 if (!old_entry)
626 goto out;
627
628 if (S_ISDIR(old_inode->i_mode)) {
629 err = -EIO;
630 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
631 if (!old_dir_entry)
632 goto out_old;
633 }
634
635 if (flags & RENAME_WHITEOUT) {
636 err = f2fs_create_whiteout(old_dir, &whiteout);
637 if (err)
638 goto out_dir;
639 }
640
641 if (new_inode) {
642
643 err = -ENOTEMPTY;
644 if (old_dir_entry && !f2fs_empty_dir(new_inode))
645 goto out_whiteout;
646
647 err = -ENOENT;
648 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
649 &new_page);
650 if (!new_entry)
651 goto out_whiteout;
652
653 f2fs_balance_fs(sbi, true);
654
655 f2fs_lock_op(sbi);
656
657 err = acquire_orphan_inode(sbi);
658 if (err)
659 goto put_out_dir;
660
661 err = update_dent_inode(old_inode, new_inode,
662 &new_dentry->d_name);
663 if (err) {
664 release_orphan_inode(sbi);
665 goto put_out_dir;
666 }
667
668 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
669
670 new_inode->i_ctime = CURRENT_TIME;
671 down_write(&F2FS_I(new_inode)->i_sem);
672 if (old_dir_entry)
673 drop_nlink(new_inode);
674 drop_nlink(new_inode);
675 up_write(&F2FS_I(new_inode)->i_sem);
676
677 mark_inode_dirty(new_inode);
678
679 if (!new_inode->i_nlink)
680 add_orphan_inode(sbi, new_inode->i_ino);
681 else
682 release_orphan_inode(sbi);
683
684 update_inode_page(old_inode);
685 update_inode_page(new_inode);
686 } else {
687 f2fs_balance_fs(sbi, true);
688
689 f2fs_lock_op(sbi);
690
691 err = f2fs_add_link(new_dentry, old_inode);
692 if (err) {
693 f2fs_unlock_op(sbi);
694 goto out_whiteout;
695 }
696
697 if (old_dir_entry) {
698 inc_nlink(new_dir);
699 update_inode_page(new_dir);
700 }
701 }
702
703 down_write(&F2FS_I(old_inode)->i_sem);
704 file_lost_pino(old_inode);
705 if (new_inode && file_enc_name(new_inode))
706 file_set_enc_name(old_inode);
707 up_write(&F2FS_I(old_inode)->i_sem);
708
709 old_inode->i_ctime = CURRENT_TIME;
710 mark_inode_dirty(old_inode);
711
712 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
713
714 if (whiteout) {
715 whiteout->i_state |= I_LINKABLE;
716 set_inode_flag(F2FS_I(whiteout), FI_INC_LINK);
717 err = f2fs_add_link(old_dentry, whiteout);
718 if (err)
719 goto put_out_dir;
720 whiteout->i_state &= ~I_LINKABLE;
721 iput(whiteout);
722 }
723
724 if (old_dir_entry) {
725 if (old_dir != new_dir && !whiteout) {
726 f2fs_set_link(old_inode, old_dir_entry,
727 old_dir_page, new_dir);
728 update_inode_page(old_inode);
729 } else {
730 f2fs_dentry_kunmap(old_inode, old_dir_page);
731 f2fs_put_page(old_dir_page, 0);
732 }
733 drop_nlink(old_dir);
734 mark_inode_dirty(old_dir);
735 update_inode_page(old_dir);
736 }
737
738 f2fs_unlock_op(sbi);
739
740 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
741 f2fs_sync_fs(sbi->sb, 1);
742 return 0;
743
744 put_out_dir:
745 f2fs_unlock_op(sbi);
746 if (new_page) {
747 f2fs_dentry_kunmap(new_dir, new_page);
748 f2fs_put_page(new_page, 0);
749 }
750 out_whiteout:
751 if (whiteout)
752 iput(whiteout);
753 out_dir:
754 if (old_dir_entry) {
755 f2fs_dentry_kunmap(old_inode, old_dir_page);
756 f2fs_put_page(old_dir_page, 0);
757 }
758 out_old:
759 f2fs_dentry_kunmap(old_dir, old_page);
760 f2fs_put_page(old_page, 0);
761 out:
762 return err;
763 }
764
765 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
766 struct inode *new_dir, struct dentry *new_dentry)
767 {
768 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
769 struct inode *old_inode = d_inode(old_dentry);
770 struct inode *new_inode = d_inode(new_dentry);
771 struct page *old_dir_page, *new_dir_page;
772 struct page *old_page, *new_page;
773 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
774 struct f2fs_dir_entry *old_entry, *new_entry;
775 int old_nlink = 0, new_nlink = 0;
776 int err = -ENOENT;
777
778 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
779 (old_dir != new_dir) &&
780 (!f2fs_is_child_context_consistent_with_parent(new_dir,
781 old_inode) ||
782 !f2fs_is_child_context_consistent_with_parent(old_dir,
783 new_inode)))
784 return -EPERM;
785
786 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
787 if (!old_entry)
788 goto out;
789
790 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
791 if (!new_entry)
792 goto out_old;
793
794 /* prepare for updating ".." directory entry info later */
795 if (old_dir != new_dir) {
796 if (S_ISDIR(old_inode->i_mode)) {
797 err = -EIO;
798 old_dir_entry = f2fs_parent_dir(old_inode,
799 &old_dir_page);
800 if (!old_dir_entry)
801 goto out_new;
802 }
803
804 if (S_ISDIR(new_inode->i_mode)) {
805 err = -EIO;
806 new_dir_entry = f2fs_parent_dir(new_inode,
807 &new_dir_page);
808 if (!new_dir_entry)
809 goto out_old_dir;
810 }
811 }
812
813 /*
814 * If cross rename between file and directory those are not
815 * in the same directory, we will inc nlink of file's parent
816 * later, so we should check upper boundary of its nlink.
817 */
818 if ((!old_dir_entry || !new_dir_entry) &&
819 old_dir_entry != new_dir_entry) {
820 old_nlink = old_dir_entry ? -1 : 1;
821 new_nlink = -old_nlink;
822 err = -EMLINK;
823 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
824 (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
825 goto out_new_dir;
826 }
827
828 f2fs_balance_fs(sbi, true);
829
830 f2fs_lock_op(sbi);
831
832 err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
833 if (err)
834 goto out_unlock;
835 if (file_enc_name(new_inode))
836 file_set_enc_name(old_inode);
837
838 err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
839 if (err)
840 goto out_undo;
841 if (file_enc_name(old_inode))
842 file_set_enc_name(new_inode);
843
844 /* update ".." directory entry info of old dentry */
845 if (old_dir_entry)
846 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
847
848 /* update ".." directory entry info of new dentry */
849 if (new_dir_entry)
850 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
851
852 /* update directory entry info of old dir inode */
853 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
854
855 down_write(&F2FS_I(old_inode)->i_sem);
856 file_lost_pino(old_inode);
857 up_write(&F2FS_I(old_inode)->i_sem);
858
859 update_inode_page(old_inode);
860
861 old_dir->i_ctime = CURRENT_TIME;
862 if (old_nlink) {
863 down_write(&F2FS_I(old_dir)->i_sem);
864 if (old_nlink < 0)
865 drop_nlink(old_dir);
866 else
867 inc_nlink(old_dir);
868 up_write(&F2FS_I(old_dir)->i_sem);
869 }
870 mark_inode_dirty(old_dir);
871 update_inode_page(old_dir);
872
873 /* update directory entry info of new dir inode */
874 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
875
876 down_write(&F2FS_I(new_inode)->i_sem);
877 file_lost_pino(new_inode);
878 up_write(&F2FS_I(new_inode)->i_sem);
879
880 update_inode_page(new_inode);
881
882 new_dir->i_ctime = CURRENT_TIME;
883 if (new_nlink) {
884 down_write(&F2FS_I(new_dir)->i_sem);
885 if (new_nlink < 0)
886 drop_nlink(new_dir);
887 else
888 inc_nlink(new_dir);
889 up_write(&F2FS_I(new_dir)->i_sem);
890 }
891 mark_inode_dirty(new_dir);
892 update_inode_page(new_dir);
893
894 f2fs_unlock_op(sbi);
895
896 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
897 f2fs_sync_fs(sbi->sb, 1);
898 return 0;
899 out_undo:
900 /*
901 * Still we may fail to recover name info of f2fs_inode here
902 * Drop it, once its name is set as encrypted
903 */
904 update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
905 out_unlock:
906 f2fs_unlock_op(sbi);
907 out_new_dir:
908 if (new_dir_entry) {
909 f2fs_dentry_kunmap(new_inode, new_dir_page);
910 f2fs_put_page(new_dir_page, 0);
911 }
912 out_old_dir:
913 if (old_dir_entry) {
914 f2fs_dentry_kunmap(old_inode, old_dir_page);
915 f2fs_put_page(old_dir_page, 0);
916 }
917 out_new:
918 f2fs_dentry_kunmap(new_dir, new_page);
919 f2fs_put_page(new_page, 0);
920 out_old:
921 f2fs_dentry_kunmap(old_dir, old_page);
922 f2fs_put_page(old_page, 0);
923 out:
924 return err;
925 }
926
927 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
928 struct inode *new_dir, struct dentry *new_dentry,
929 unsigned int flags)
930 {
931 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
932 return -EINVAL;
933
934 if (flags & RENAME_EXCHANGE) {
935 return f2fs_cross_rename(old_dir, old_dentry,
936 new_dir, new_dentry);
937 }
938 /*
939 * VFS has already handled the new dentry existence case,
940 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
941 */
942 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
943 }
944
945 #ifdef CONFIG_F2FS_FS_ENCRYPTION
946 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
947 struct inode *inode,
948 struct delayed_call *done)
949 {
950 struct page *cpage = NULL;
951 char *caddr, *paddr = NULL;
952 struct f2fs_str cstr = FSTR_INIT(NULL, 0);
953 struct f2fs_str pstr = FSTR_INIT(NULL, 0);
954 struct f2fs_encrypted_symlink_data *sd;
955 loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
956 u32 max_size = inode->i_sb->s_blocksize;
957 int res;
958
959 if (!dentry)
960 return ERR_PTR(-ECHILD);
961
962 res = f2fs_get_encryption_info(inode);
963 if (res)
964 return ERR_PTR(res);
965
966 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
967 if (IS_ERR(cpage))
968 return ERR_CAST(cpage);
969 caddr = page_address(cpage);
970 caddr[size] = 0;
971
972 /* Symlink is encrypted */
973 sd = (struct f2fs_encrypted_symlink_data *)caddr;
974 cstr.name = sd->encrypted_path;
975 cstr.len = le16_to_cpu(sd->len);
976
977 /* this is broken symlink case */
978 if (unlikely(cstr.len == 0)) {
979 res = -ENOENT;
980 goto errout;
981 }
982
983 /* this is broken symlink case */
984 if (unlikely(cstr.name[0] == 0)) {
985 res = -ENOENT;
986 goto errout;
987 }
988
989 if ((cstr.len + sizeof(struct f2fs_encrypted_symlink_data) - 1) >
990 max_size) {
991 /* Symlink data on the disk is corrupted */
992 res = -EIO;
993 goto errout;
994 }
995 res = f2fs_fname_crypto_alloc_buffer(inode, cstr.len, &pstr);
996 if (res)
997 goto errout;
998
999 res = f2fs_fname_disk_to_usr(inode, NULL, &cstr, &pstr);
1000 if (res < 0)
1001 goto errout;
1002
1003 paddr = pstr.name;
1004
1005 /* Null-terminate the name */
1006 paddr[res] = '\0';
1007
1008 page_cache_release(cpage);
1009 set_delayed_call(done, kfree_link, paddr);
1010 return paddr;
1011 errout:
1012 f2fs_fname_crypto_free_buffer(&pstr);
1013 page_cache_release(cpage);
1014 return ERR_PTR(res);
1015 }
1016
1017 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1018 .readlink = generic_readlink,
1019 .get_link = f2fs_encrypted_get_link,
1020 .getattr = f2fs_getattr,
1021 .setattr = f2fs_setattr,
1022 #ifdef CONFIG_F2FS_FS_XATTR
1023 .setxattr = generic_setxattr,
1024 .getxattr = generic_getxattr,
1025 .listxattr = f2fs_listxattr,
1026 .removexattr = generic_removexattr,
1027 #endif
1028 };
1029 #endif
1030
1031 const struct inode_operations f2fs_dir_inode_operations = {
1032 .create = f2fs_create,
1033 .lookup = f2fs_lookup,
1034 .link = f2fs_link,
1035 .unlink = f2fs_unlink,
1036 .symlink = f2fs_symlink,
1037 .mkdir = f2fs_mkdir,
1038 .rmdir = f2fs_rmdir,
1039 .mknod = f2fs_mknod,
1040 .rename2 = f2fs_rename2,
1041 .tmpfile = f2fs_tmpfile,
1042 .getattr = f2fs_getattr,
1043 .setattr = f2fs_setattr,
1044 .get_acl = f2fs_get_acl,
1045 .set_acl = f2fs_set_acl,
1046 #ifdef CONFIG_F2FS_FS_XATTR
1047 .setxattr = generic_setxattr,
1048 .getxattr = generic_getxattr,
1049 .listxattr = f2fs_listxattr,
1050 .removexattr = generic_removexattr,
1051 #endif
1052 };
1053
1054 const struct inode_operations f2fs_symlink_inode_operations = {
1055 .readlink = generic_readlink,
1056 .get_link = f2fs_get_link,
1057 .getattr = f2fs_getattr,
1058 .setattr = f2fs_setattr,
1059 #ifdef CONFIG_F2FS_FS_XATTR
1060 .setxattr = generic_setxattr,
1061 .getxattr = generic_getxattr,
1062 .listxattr = f2fs_listxattr,
1063 .removexattr = generic_removexattr,
1064 #endif
1065 };
1066
1067 const struct inode_operations f2fs_special_inode_operations = {
1068 .getattr = f2fs_getattr,
1069 .setattr = f2fs_setattr,
1070 .get_acl = f2fs_get_acl,
1071 .set_acl = f2fs_set_acl,
1072 #ifdef CONFIG_F2FS_FS_XATTR
1073 .setxattr = generic_setxattr,
1074 .getxattr = generic_getxattr,
1075 .listxattr = f2fs_listxattr,
1076 .removexattr = generic_removexattr,
1077 #endif
1078 };
Linux kernel - Deliverables
This page took 0.066161 seconds and 5 git commands to generate.