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f2fs: propagate error given by f2fs_find_entry
[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 set_inode_flag(inode, FI_NEW_INODE);
64
65 if (test_opt(sbi, INLINE_XATTR))
66 set_inode_flag(inode, FI_INLINE_XATTR);
67 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
68 set_inode_flag(inode, FI_INLINE_DATA);
69 if (f2fs_may_inline_dentry(inode))
70 set_inode_flag(inode, FI_INLINE_DENTRY);
71
72 f2fs_init_extent_tree(inode, NULL);
73
74 stat_inc_inline_xattr(inode);
75 stat_inc_inline_inode(inode);
76 stat_inc_inline_dir(inode);
77
78 trace_f2fs_new_inode(inode, 0);
79 return inode;
80
81 fail:
82 trace_f2fs_new_inode(inode, err);
83 make_bad_inode(inode);
84 if (nid_free)
85 set_inode_flag(inode, FI_FREE_NID);
86 iput(inode);
87 return ERR_PTR(err);
88 }
89
90 static int is_multimedia_file(const unsigned char *s, const char *sub)
91 {
92 size_t slen = strlen(s);
93 size_t sublen = strlen(sub);
94
95 /*
96 * filename format of multimedia file should be defined as:
97 * "filename + '.' + extension".
98 */
99 if (slen < sublen + 2)
100 return 0;
101
102 if (s[slen - sublen - 1] != '.')
103 return 0;
104
105 return !strncasecmp(s + slen - sublen, sub, sublen);
106 }
107
108 /*
109 * Set multimedia files as cold files for hot/cold data separation
110 */
111 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
112 const unsigned char *name)
113 {
114 int i;
115 __u8 (*extlist)[8] = sbi->raw_super->extension_list;
116
117 int count = le32_to_cpu(sbi->raw_super->extension_count);
118 for (i = 0; i < count; i++) {
119 if (is_multimedia_file(name, extlist[i])) {
120 file_set_cold(inode);
121 break;
122 }
123 }
124 }
125
126 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
127 bool excl)
128 {
129 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
130 struct inode *inode;
131 nid_t ino = 0;
132 int err;
133
134 inode = f2fs_new_inode(dir, mode);
135 if (IS_ERR(inode))
136 return PTR_ERR(inode);
137
138 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
139 set_cold_files(sbi, inode, dentry->d_name.name);
140
141 inode->i_op = &f2fs_file_inode_operations;
142 inode->i_fop = &f2fs_file_operations;
143 inode->i_mapping->a_ops = &f2fs_dblock_aops;
144 ino = inode->i_ino;
145
146 f2fs_balance_fs(sbi, true);
147
148 f2fs_lock_op(sbi);
149 err = f2fs_add_link(dentry, inode);
150 if (err)
151 goto out;
152 f2fs_unlock_op(sbi);
153
154 alloc_nid_done(sbi, ino);
155
156 d_instantiate(dentry, inode);
157 unlock_new_inode(inode);
158
159 if (IS_DIRSYNC(dir))
160 f2fs_sync_fs(sbi->sb, 1);
161 return 0;
162 out:
163 handle_failed_inode(inode);
164 return err;
165 }
166
167 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
168 struct dentry *dentry)
169 {
170 struct inode *inode = d_inode(old_dentry);
171 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
172 int err;
173
174 if (f2fs_encrypted_inode(dir) &&
175 !fscrypt_has_permitted_context(dir, inode))
176 return -EPERM;
177
178 f2fs_balance_fs(sbi, true);
179
180 inode->i_ctime = CURRENT_TIME;
181 ihold(inode);
182
183 set_inode_flag(inode, FI_INC_LINK);
184 f2fs_lock_op(sbi);
185 err = f2fs_add_link(dentry, inode);
186 if (err)
187 goto out;
188 f2fs_unlock_op(sbi);
189
190 d_instantiate(dentry, inode);
191
192 if (IS_DIRSYNC(dir))
193 f2fs_sync_fs(sbi->sb, 1);
194 return 0;
195 out:
196 clear_inode_flag(inode, FI_INC_LINK);
197 iput(inode);
198 f2fs_unlock_op(sbi);
199 return err;
200 }
201
202 struct dentry *f2fs_get_parent(struct dentry *child)
203 {
204 struct qstr dotdot = QSTR_INIT("..", 2);
205 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot);
206 if (!ino)
207 return ERR_PTR(-ENOENT);
208 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
209 }
210
211 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
212 {
213 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
214 struct qstr dot = QSTR_INIT(".", 1);
215 struct qstr dotdot = QSTR_INIT("..", 2);
216 struct f2fs_dir_entry *de;
217 struct page *page;
218 int err = 0;
219
220 if (f2fs_readonly(sbi->sb)) {
221 f2fs_msg(sbi->sb, KERN_INFO,
222 "skip recovering inline_dots inode (ino:%lu, pino:%u) "
223 "in readonly mountpoint", dir->i_ino, pino);
224 return 0;
225 }
226
227 f2fs_balance_fs(sbi, true);
228
229 f2fs_lock_op(sbi);
230
231 de = f2fs_find_entry(dir, &dot, &page);
232 if (de) {
233 f2fs_dentry_kunmap(dir, page);
234 f2fs_put_page(page, 0);
235 } else if (IS_ERR(page)) {
236 err = PTR_ERR(page);
237 goto out;
238 } else {
239 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
240 if (err)
241 goto out;
242 }
243
244 de = f2fs_find_entry(dir, &dotdot, &page);
245 if (de) {
246 f2fs_dentry_kunmap(dir, page);
247 f2fs_put_page(page, 0);
248 } else if (IS_ERR(page)) {
249 err = PTR_ERR(page);
250 } else {
251 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
252 }
253 out:
254 if (!err)
255 clear_inode_flag(dir, FI_INLINE_DOTS);
256
257 f2fs_unlock_op(sbi);
258 return err;
259 }
260
261 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
262 unsigned int flags)
263 {
264 struct inode *inode = NULL;
265 struct f2fs_dir_entry *de;
266 struct page *page;
267 nid_t ino;
268 int err = 0;
269 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
270
271 if (f2fs_encrypted_inode(dir)) {
272 int res = fscrypt_get_encryption_info(dir);
273
274 /*
275 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
276 * created while the directory was encrypted and we
277 * don't have access to the key.
278 */
279 if (fscrypt_has_encryption_key(dir))
280 fscrypt_set_encrypted_dentry(dentry);
281 fscrypt_set_d_op(dentry);
282 if (res && res != -ENOKEY)
283 return ERR_PTR(res);
284 }
285
286 if (dentry->d_name.len > F2FS_NAME_LEN)
287 return ERR_PTR(-ENAMETOOLONG);
288
289 de = f2fs_find_entry(dir, &dentry->d_name, &page);
290 if (!de)
291 return d_splice_alias(inode, dentry);
292
293 ino = le32_to_cpu(de->ino);
294 f2fs_dentry_kunmap(dir, page);
295 f2fs_put_page(page, 0);
296
297 inode = f2fs_iget(dir->i_sb, ino);
298 if (IS_ERR(inode))
299 return ERR_CAST(inode);
300
301 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
302 err = __recover_dot_dentries(dir, root_ino);
303 if (err)
304 goto err_out;
305 }
306
307 if (f2fs_has_inline_dots(inode)) {
308 err = __recover_dot_dentries(inode, dir->i_ino);
309 if (err)
310 goto err_out;
311 }
312 if (!IS_ERR(inode) && f2fs_encrypted_inode(dir) &&
313 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
314 !fscrypt_has_permitted_context(dir, inode)) {
315 bool nokey = f2fs_encrypted_inode(inode) &&
316 !fscrypt_has_encryption_key(inode);
317 err = nokey ? -ENOKEY : -EPERM;
318 goto err_out;
319 }
320 return d_splice_alias(inode, dentry);
321
322 err_out:
323 iput(inode);
324 return ERR_PTR(err);
325 }
326
327 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
328 {
329 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
330 struct inode *inode = d_inode(dentry);
331 struct f2fs_dir_entry *de;
332 struct page *page;
333 int err = -ENOENT;
334
335 trace_f2fs_unlink_enter(dir, dentry);
336
337 de = f2fs_find_entry(dir, &dentry->d_name, &page);
338 if (!de)
339 goto fail;
340
341 f2fs_balance_fs(sbi, true);
342
343 f2fs_lock_op(sbi);
344 err = acquire_orphan_inode(sbi);
345 if (err) {
346 f2fs_unlock_op(sbi);
347 f2fs_dentry_kunmap(dir, page);
348 f2fs_put_page(page, 0);
349 goto fail;
350 }
351 f2fs_delete_entry(de, page, dir, inode);
352 f2fs_unlock_op(sbi);
353
354 if (IS_DIRSYNC(dir))
355 f2fs_sync_fs(sbi->sb, 1);
356 fail:
357 trace_f2fs_unlink_exit(inode, err);
358 return err;
359 }
360
361 static const char *f2fs_get_link(struct dentry *dentry,
362 struct inode *inode,
363 struct delayed_call *done)
364 {
365 const char *link = page_get_link(dentry, inode, done);
366 if (!IS_ERR(link) && !*link) {
367 /* this is broken symlink case */
368 do_delayed_call(done);
369 clear_delayed_call(done);
370 link = ERR_PTR(-ENOENT);
371 }
372 return link;
373 }
374
375 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
376 const char *symname)
377 {
378 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
379 struct inode *inode;
380 size_t len = strlen(symname);
381 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
382 struct fscrypt_symlink_data *sd = NULL;
383 int err;
384
385 if (f2fs_encrypted_inode(dir)) {
386 err = fscrypt_get_encryption_info(dir);
387 if (err)
388 return err;
389
390 if (!fscrypt_has_encryption_key(dir))
391 return -EPERM;
392
393 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
394 sizeof(struct fscrypt_symlink_data));
395 }
396
397 if (disk_link.len > dir->i_sb->s_blocksize)
398 return -ENAMETOOLONG;
399
400 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
401 if (IS_ERR(inode))
402 return PTR_ERR(inode);
403
404 if (f2fs_encrypted_inode(inode))
405 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
406 else
407 inode->i_op = &f2fs_symlink_inode_operations;
408 inode_nohighmem(inode);
409 inode->i_mapping->a_ops = &f2fs_dblock_aops;
410
411 f2fs_balance_fs(sbi, true);
412
413 f2fs_lock_op(sbi);
414 err = f2fs_add_link(dentry, inode);
415 if (err)
416 goto out;
417 f2fs_unlock_op(sbi);
418 alloc_nid_done(sbi, inode->i_ino);
419
420 if (f2fs_encrypted_inode(inode)) {
421 struct qstr istr = QSTR_INIT(symname, len);
422 struct fscrypt_str ostr;
423
424 sd = kzalloc(disk_link.len, GFP_NOFS);
425 if (!sd) {
426 err = -ENOMEM;
427 goto err_out;
428 }
429
430 err = fscrypt_get_encryption_info(inode);
431 if (err)
432 goto err_out;
433
434 if (!fscrypt_has_encryption_key(inode)) {
435 err = -EPERM;
436 goto err_out;
437 }
438
439 ostr.name = sd->encrypted_path;
440 ostr.len = disk_link.len;
441 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
442 if (err < 0)
443 goto err_out;
444
445 sd->len = cpu_to_le16(ostr.len);
446 disk_link.name = (char *)sd;
447 }
448
449 err = page_symlink(inode, disk_link.name, disk_link.len);
450
451 err_out:
452 d_instantiate(dentry, inode);
453 unlock_new_inode(inode);
454
455 /*
456 * Let's flush symlink data in order to avoid broken symlink as much as
457 * possible. Nevertheless, fsyncing is the best way, but there is no
458 * way to get a file descriptor in order to flush that.
459 *
460 * Note that, it needs to do dir->fsync to make this recoverable.
461 * If the symlink path is stored into inline_data, there is no
462 * performance regression.
463 */
464 if (!err) {
465 filemap_write_and_wait_range(inode->i_mapping, 0,
466 disk_link.len - 1);
467
468 if (IS_DIRSYNC(dir))
469 f2fs_sync_fs(sbi->sb, 1);
470 } else {
471 f2fs_unlink(dir, dentry);
472 }
473
474 kfree(sd);
475 return err;
476 out:
477 handle_failed_inode(inode);
478 return err;
479 }
480
481 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
482 {
483 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
484 struct inode *inode;
485 int err;
486
487 inode = f2fs_new_inode(dir, S_IFDIR | mode);
488 if (IS_ERR(inode))
489 return PTR_ERR(inode);
490
491 inode->i_op = &f2fs_dir_inode_operations;
492 inode->i_fop = &f2fs_dir_operations;
493 inode->i_mapping->a_ops = &f2fs_dblock_aops;
494 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
495
496 f2fs_balance_fs(sbi, true);
497
498 set_inode_flag(inode, FI_INC_LINK);
499 f2fs_lock_op(sbi);
500 err = f2fs_add_link(dentry, inode);
501 if (err)
502 goto out_fail;
503 f2fs_unlock_op(sbi);
504
505 alloc_nid_done(sbi, inode->i_ino);
506
507 d_instantiate(dentry, inode);
508 unlock_new_inode(inode);
509
510 if (IS_DIRSYNC(dir))
511 f2fs_sync_fs(sbi->sb, 1);
512 return 0;
513
514 out_fail:
515 clear_inode_flag(inode, FI_INC_LINK);
516 handle_failed_inode(inode);
517 return err;
518 }
519
520 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
521 {
522 struct inode *inode = d_inode(dentry);
523 if (f2fs_empty_dir(inode))
524 return f2fs_unlink(dir, dentry);
525 return -ENOTEMPTY;
526 }
527
528 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
529 umode_t mode, dev_t rdev)
530 {
531 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
532 struct inode *inode;
533 int err = 0;
534
535 inode = f2fs_new_inode(dir, mode);
536 if (IS_ERR(inode))
537 return PTR_ERR(inode);
538
539 init_special_inode(inode, inode->i_mode, rdev);
540 inode->i_op = &f2fs_special_inode_operations;
541
542 f2fs_balance_fs(sbi, true);
543
544 f2fs_lock_op(sbi);
545 err = f2fs_add_link(dentry, inode);
546 if (err)
547 goto out;
548 f2fs_unlock_op(sbi);
549
550 alloc_nid_done(sbi, inode->i_ino);
551
552 d_instantiate(dentry, inode);
553 unlock_new_inode(inode);
554
555 if (IS_DIRSYNC(dir))
556 f2fs_sync_fs(sbi->sb, 1);
557 return 0;
558 out:
559 handle_failed_inode(inode);
560 return err;
561 }
562
563 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
564 umode_t mode, struct inode **whiteout)
565 {
566 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
567 struct inode *inode;
568 int err;
569
570 inode = f2fs_new_inode(dir, mode);
571 if (IS_ERR(inode))
572 return PTR_ERR(inode);
573
574 if (whiteout) {
575 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
576 inode->i_op = &f2fs_special_inode_operations;
577 } else {
578 inode->i_op = &f2fs_file_inode_operations;
579 inode->i_fop = &f2fs_file_operations;
580 inode->i_mapping->a_ops = &f2fs_dblock_aops;
581 }
582
583 f2fs_balance_fs(sbi, true);
584
585 f2fs_lock_op(sbi);
586 err = acquire_orphan_inode(sbi);
587 if (err)
588 goto out;
589
590 err = f2fs_do_tmpfile(inode, dir);
591 if (err)
592 goto release_out;
593
594 /*
595 * add this non-linked tmpfile to orphan list, in this way we could
596 * remove all unused data of tmpfile after abnormal power-off.
597 */
598 add_orphan_inode(sbi, inode->i_ino);
599 alloc_nid_done(sbi, inode->i_ino);
600
601 if (whiteout) {
602 f2fs_i_links_write(inode, false);
603 *whiteout = inode;
604 } else {
605 d_tmpfile(dentry, inode);
606 }
607 /* link_count was changed by d_tmpfile as well. */
608 f2fs_unlock_op(sbi);
609 unlock_new_inode(inode);
610 return 0;
611
612 release_out:
613 release_orphan_inode(sbi);
614 out:
615 handle_failed_inode(inode);
616 return err;
617 }
618
619 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
620 {
621 if (f2fs_encrypted_inode(dir)) {
622 int err = fscrypt_get_encryption_info(dir);
623 if (err)
624 return err;
625 }
626
627 return __f2fs_tmpfile(dir, dentry, mode, NULL);
628 }
629
630 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
631 {
632 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
633 }
634
635 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
636 struct inode *new_dir, struct dentry *new_dentry,
637 unsigned int flags)
638 {
639 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
640 struct inode *old_inode = d_inode(old_dentry);
641 struct inode *new_inode = d_inode(new_dentry);
642 struct inode *whiteout = NULL;
643 struct page *old_dir_page;
644 struct page *old_page, *new_page = NULL;
645 struct f2fs_dir_entry *old_dir_entry = NULL;
646 struct f2fs_dir_entry *old_entry;
647 struct f2fs_dir_entry *new_entry;
648 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
649 int err = -ENOENT;
650
651 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
652 !fscrypt_has_permitted_context(new_dir, old_inode)) {
653 err = -EPERM;
654 goto out;
655 }
656
657 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
658 if (!old_entry)
659 goto out;
660
661 if (S_ISDIR(old_inode->i_mode)) {
662 err = -EIO;
663 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
664 if (!old_dir_entry)
665 goto out_old;
666 }
667
668 if (flags & RENAME_WHITEOUT) {
669 err = f2fs_create_whiteout(old_dir, &whiteout);
670 if (err)
671 goto out_dir;
672 }
673
674 if (new_inode) {
675
676 err = -ENOTEMPTY;
677 if (old_dir_entry && !f2fs_empty_dir(new_inode))
678 goto out_whiteout;
679
680 err = -ENOENT;
681 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
682 &new_page);
683 if (!new_entry)
684 goto out_whiteout;
685
686 f2fs_balance_fs(sbi, true);
687
688 f2fs_lock_op(sbi);
689
690 err = acquire_orphan_inode(sbi);
691 if (err)
692 goto put_out_dir;
693
694 err = update_dent_inode(old_inode, new_inode,
695 &new_dentry->d_name);
696 if (err) {
697 release_orphan_inode(sbi);
698 goto put_out_dir;
699 }
700
701 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
702
703 new_inode->i_ctime = CURRENT_TIME;
704 down_write(&F2FS_I(new_inode)->i_sem);
705 if (old_dir_entry)
706 f2fs_i_links_write(new_inode, false);
707 f2fs_i_links_write(new_inode, false);
708 up_write(&F2FS_I(new_inode)->i_sem);
709
710 if (!new_inode->i_nlink)
711 add_orphan_inode(sbi, new_inode->i_ino);
712 else
713 release_orphan_inode(sbi);
714 } else {
715 f2fs_balance_fs(sbi, true);
716
717 f2fs_lock_op(sbi);
718
719 err = f2fs_add_link(new_dentry, old_inode);
720 if (err) {
721 f2fs_unlock_op(sbi);
722 goto out_whiteout;
723 }
724
725 if (old_dir_entry)
726 f2fs_i_links_write(new_dir, true);
727
728 /*
729 * old entry and new entry can locate in the same inline
730 * dentry in inode, when attaching new entry in inline dentry,
731 * it could force inline dentry conversion, after that,
732 * old_entry and old_page will point to wrong address, in
733 * order to avoid this, let's do the check and update here.
734 */
735 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
736 f2fs_put_page(old_page, 0);
737 old_page = NULL;
738
739 old_entry = f2fs_find_entry(old_dir,
740 &old_dentry->d_name, &old_page);
741 if (!old_entry) {
742 err = -EIO;
743 f2fs_unlock_op(sbi);
744 goto out_whiteout;
745 }
746 }
747 }
748
749 down_write(&F2FS_I(old_inode)->i_sem);
750 file_lost_pino(old_inode);
751 if (new_inode && file_enc_name(new_inode))
752 file_set_enc_name(old_inode);
753 up_write(&F2FS_I(old_inode)->i_sem);
754
755 old_inode->i_ctime = CURRENT_TIME;
756 mark_inode_dirty_sync(old_inode);
757
758 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
759
760 if (whiteout) {
761 whiteout->i_state |= I_LINKABLE;
762 set_inode_flag(whiteout, FI_INC_LINK);
763 err = f2fs_add_link(old_dentry, whiteout);
764 if (err)
765 goto put_out_dir;
766 whiteout->i_state &= ~I_LINKABLE;
767 iput(whiteout);
768 }
769
770 if (old_dir_entry) {
771 if (old_dir != new_dir && !whiteout) {
772 f2fs_set_link(old_inode, old_dir_entry,
773 old_dir_page, new_dir);
774 } else {
775 f2fs_dentry_kunmap(old_inode, old_dir_page);
776 f2fs_put_page(old_dir_page, 0);
777 }
778 f2fs_i_links_write(old_dir, false);
779 }
780
781 f2fs_unlock_op(sbi);
782
783 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
784 f2fs_sync_fs(sbi->sb, 1);
785 return 0;
786
787 put_out_dir:
788 f2fs_unlock_op(sbi);
789 if (new_page) {
790 f2fs_dentry_kunmap(new_dir, new_page);
791 f2fs_put_page(new_page, 0);
792 }
793 out_whiteout:
794 if (whiteout)
795 iput(whiteout);
796 out_dir:
797 if (old_dir_entry) {
798 f2fs_dentry_kunmap(old_inode, old_dir_page);
799 f2fs_put_page(old_dir_page, 0);
800 }
801 out_old:
802 f2fs_dentry_kunmap(old_dir, old_page);
803 f2fs_put_page(old_page, 0);
804 out:
805 return err;
806 }
807
808 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
809 struct inode *new_dir, struct dentry *new_dentry)
810 {
811 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
812 struct inode *old_inode = d_inode(old_dentry);
813 struct inode *new_inode = d_inode(new_dentry);
814 struct page *old_dir_page, *new_dir_page;
815 struct page *old_page, *new_page;
816 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
817 struct f2fs_dir_entry *old_entry, *new_entry;
818 int old_nlink = 0, new_nlink = 0;
819 int err = -ENOENT;
820
821 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
822 (old_dir != new_dir) &&
823 (!fscrypt_has_permitted_context(new_dir, old_inode) ||
824 !fscrypt_has_permitted_context(old_dir, new_inode)))
825 return -EPERM;
826
827 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
828 if (!old_entry)
829 goto out;
830
831 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
832 if (!new_entry)
833 goto out_old;
834
835 /* prepare for updating ".." directory entry info later */
836 if (old_dir != new_dir) {
837 if (S_ISDIR(old_inode->i_mode)) {
838 err = -EIO;
839 old_dir_entry = f2fs_parent_dir(old_inode,
840 &old_dir_page);
841 if (!old_dir_entry)
842 goto out_new;
843 }
844
845 if (S_ISDIR(new_inode->i_mode)) {
846 err = -EIO;
847 new_dir_entry = f2fs_parent_dir(new_inode,
848 &new_dir_page);
849 if (!new_dir_entry)
850 goto out_old_dir;
851 }
852 }
853
854 /*
855 * If cross rename between file and directory those are not
856 * in the same directory, we will inc nlink of file's parent
857 * later, so we should check upper boundary of its nlink.
858 */
859 if ((!old_dir_entry || !new_dir_entry) &&
860 old_dir_entry != new_dir_entry) {
861 old_nlink = old_dir_entry ? -1 : 1;
862 new_nlink = -old_nlink;
863 err = -EMLINK;
864 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
865 (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
866 goto out_new_dir;
867 }
868
869 f2fs_balance_fs(sbi, true);
870
871 f2fs_lock_op(sbi);
872
873 err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
874 if (err)
875 goto out_unlock;
876 if (file_enc_name(new_inode))
877 file_set_enc_name(old_inode);
878
879 err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
880 if (err)
881 goto out_undo;
882 if (file_enc_name(old_inode))
883 file_set_enc_name(new_inode);
884
885 /* update ".." directory entry info of old dentry */
886 if (old_dir_entry)
887 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
888
889 /* update ".." directory entry info of new dentry */
890 if (new_dir_entry)
891 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
892
893 /* update directory entry info of old dir inode */
894 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
895
896 down_write(&F2FS_I(old_inode)->i_sem);
897 file_lost_pino(old_inode);
898 up_write(&F2FS_I(old_inode)->i_sem);
899
900 old_dir->i_ctime = CURRENT_TIME;
901 if (old_nlink) {
902 down_write(&F2FS_I(old_dir)->i_sem);
903 f2fs_i_links_write(old_dir, old_nlink > 0);
904 up_write(&F2FS_I(old_dir)->i_sem);
905 }
906 mark_inode_dirty_sync(old_dir);
907
908 /* update directory entry info of new dir inode */
909 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
910
911 down_write(&F2FS_I(new_inode)->i_sem);
912 file_lost_pino(new_inode);
913 up_write(&F2FS_I(new_inode)->i_sem);
914
915 new_dir->i_ctime = CURRENT_TIME;
916 if (new_nlink) {
917 down_write(&F2FS_I(new_dir)->i_sem);
918 f2fs_i_links_write(new_dir, new_nlink > 0);
919 up_write(&F2FS_I(new_dir)->i_sem);
920 }
921 mark_inode_dirty_sync(new_dir);
922
923 f2fs_unlock_op(sbi);
924
925 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
926 f2fs_sync_fs(sbi->sb, 1);
927 return 0;
928 out_undo:
929 /*
930 * Still we may fail to recover name info of f2fs_inode here
931 * Drop it, once its name is set as encrypted
932 */
933 update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
934 out_unlock:
935 f2fs_unlock_op(sbi);
936 out_new_dir:
937 if (new_dir_entry) {
938 f2fs_dentry_kunmap(new_inode, new_dir_page);
939 f2fs_put_page(new_dir_page, 0);
940 }
941 out_old_dir:
942 if (old_dir_entry) {
943 f2fs_dentry_kunmap(old_inode, old_dir_page);
944 f2fs_put_page(old_dir_page, 0);
945 }
946 out_new:
947 f2fs_dentry_kunmap(new_dir, new_page);
948 f2fs_put_page(new_page, 0);
949 out_old:
950 f2fs_dentry_kunmap(old_dir, old_page);
951 f2fs_put_page(old_page, 0);
952 out:
953 return err;
954 }
955
956 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
957 struct inode *new_dir, struct dentry *new_dentry,
958 unsigned int flags)
959 {
960 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
961 return -EINVAL;
962
963 if (flags & RENAME_EXCHANGE) {
964 return f2fs_cross_rename(old_dir, old_dentry,
965 new_dir, new_dentry);
966 }
967 /*
968 * VFS has already handled the new dentry existence case,
969 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
970 */
971 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
972 }
973
974 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
975 struct inode *inode,
976 struct delayed_call *done)
977 {
978 struct page *cpage = NULL;
979 char *caddr, *paddr = NULL;
980 struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
981 struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
982 struct fscrypt_symlink_data *sd;
983 loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
984 u32 max_size = inode->i_sb->s_blocksize;
985 int res;
986
987 if (!dentry)
988 return ERR_PTR(-ECHILD);
989
990 res = fscrypt_get_encryption_info(inode);
991 if (res)
992 return ERR_PTR(res);
993
994 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
995 if (IS_ERR(cpage))
996 return ERR_CAST(cpage);
997 caddr = page_address(cpage);
998 caddr[size] = 0;
999
1000 /* Symlink is encrypted */
1001 sd = (struct fscrypt_symlink_data *)caddr;
1002 cstr.name = sd->encrypted_path;
1003 cstr.len = le16_to_cpu(sd->len);
1004
1005 /* this is broken symlink case */
1006 if (unlikely(cstr.len == 0)) {
1007 res = -ENOENT;
1008 goto errout;
1009 }
1010
1011 if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1012 /* Symlink data on the disk is corrupted */
1013 res = -EIO;
1014 goto errout;
1015 }
1016 res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1017 if (res)
1018 goto errout;
1019
1020 res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1021 if (res < 0)
1022 goto errout;
1023
1024 /* this is broken symlink case */
1025 if (unlikely(pstr.name[0] == 0)) {
1026 res = -ENOENT;
1027 goto errout;
1028 }
1029
1030 paddr = pstr.name;
1031
1032 /* Null-terminate the name */
1033 paddr[res] = '\0';
1034
1035 put_page(cpage);
1036 set_delayed_call(done, kfree_link, paddr);
1037 return paddr;
1038 errout:
1039 fscrypt_fname_free_buffer(&pstr);
1040 put_page(cpage);
1041 return ERR_PTR(res);
1042 }
1043
1044 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1045 .readlink = generic_readlink,
1046 .get_link = f2fs_encrypted_get_link,
1047 .getattr = f2fs_getattr,
1048 .setattr = f2fs_setattr,
1049 #ifdef CONFIG_F2FS_FS_XATTR
1050 .setxattr = generic_setxattr,
1051 .getxattr = generic_getxattr,
1052 .listxattr = f2fs_listxattr,
1053 .removexattr = generic_removexattr,
1054 #endif
1055 };
1056
1057 const struct inode_operations f2fs_dir_inode_operations = {
1058 .create = f2fs_create,
1059 .lookup = f2fs_lookup,
1060 .link = f2fs_link,
1061 .unlink = f2fs_unlink,
1062 .symlink = f2fs_symlink,
1063 .mkdir = f2fs_mkdir,
1064 .rmdir = f2fs_rmdir,
1065 .mknod = f2fs_mknod,
1066 .rename2 = f2fs_rename2,
1067 .tmpfile = f2fs_tmpfile,
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 };
1079
1080 const struct inode_operations f2fs_symlink_inode_operations = {
1081 .readlink = generic_readlink,
1082 .get_link = f2fs_get_link,
1083 .getattr = f2fs_getattr,
1084 .setattr = f2fs_setattr,
1085 #ifdef CONFIG_F2FS_FS_XATTR
1086 .setxattr = generic_setxattr,
1087 .getxattr = generic_getxattr,
1088 .listxattr = f2fs_listxattr,
1089 .removexattr = generic_removexattr,
1090 #endif
1091 };
1092
1093 const struct inode_operations f2fs_special_inode_operations = {
1094 .getattr = f2fs_getattr,
1095 .setattr = f2fs_setattr,
1096 .get_acl = f2fs_get_acl,
1097 .set_acl = f2fs_set_acl,
1098 #ifdef CONFIG_F2FS_FS_XATTR
1099 .setxattr = generic_setxattr,
1100 .getxattr = generic_getxattr,
1101 .listxattr = f2fs_listxattr,
1102 .removexattr = generic_removexattr,
1103 #endif
1104 };
Linux kernel - Deliverables
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