]> git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - fs/f2fs/namei.c
projects / mirror_ubuntu-artful-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Merge tag 'nfs-for-4.13-4' of git://git.linux-nfs.org/projects/anna/linux-nfs
[mirror_ubuntu-artful-kernel.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 #include <linux/quotaops.h>
19
20 #include "f2fs.h"
21 #include "node.h"
22 #include "xattr.h"
23 #include "acl.h"
24 #include <trace/events/f2fs.h>
25
26 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
27 {
28 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
29 nid_t ino;
30 struct inode *inode;
31 bool nid_free = false;
32 int err;
33
34 inode = new_inode(dir->i_sb);
35 if (!inode)
36 return ERR_PTR(-ENOMEM);
37
38 f2fs_lock_op(sbi);
39 if (!alloc_nid(sbi, &ino)) {
40 f2fs_unlock_op(sbi);
41 err = -ENOSPC;
42 goto fail;
43 }
44 f2fs_unlock_op(sbi);
45
46 nid_free = true;
47
48 inode_init_owner(inode, dir, mode);
49
50 inode->i_ino = ino;
51 inode->i_blocks = 0;
52 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
53 inode->i_generation = sbi->s_next_generation++;
54
55 err = insert_inode_locked(inode);
56 if (err) {
57 err = -EINVAL;
58 goto fail;
59 }
60
61 err = dquot_initialize(inode);
62 if (err)
63 goto fail_drop;
64
65 err = dquot_alloc_inode(inode);
66 if (err)
67 goto fail_drop;
68
69 /* If the directory encrypted, then we should encrypt the inode. */
70 if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
71 f2fs_set_encrypted_inode(inode);
72
73 set_inode_flag(inode, FI_NEW_INODE);
74
75 if (test_opt(sbi, INLINE_XATTR))
76 set_inode_flag(inode, FI_INLINE_XATTR);
77 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
78 set_inode_flag(inode, FI_INLINE_DATA);
79 if (f2fs_may_inline_dentry(inode))
80 set_inode_flag(inode, FI_INLINE_DENTRY);
81
82 f2fs_init_extent_tree(inode, NULL);
83
84 stat_inc_inline_xattr(inode);
85 stat_inc_inline_inode(inode);
86 stat_inc_inline_dir(inode);
87
88 trace_f2fs_new_inode(inode, 0);
89 return inode;
90
91 fail:
92 trace_f2fs_new_inode(inode, err);
93 make_bad_inode(inode);
94 if (nid_free)
95 set_inode_flag(inode, FI_FREE_NID);
96 iput(inode);
97 return ERR_PTR(err);
98 fail_drop:
99 trace_f2fs_new_inode(inode, err);
100 dquot_drop(inode);
101 inode->i_flags |= S_NOQUOTA;
102 if (nid_free)
103 set_inode_flag(inode, FI_FREE_NID);
104 clear_nlink(inode);
105 unlock_new_inode(inode);
106 iput(inode);
107 return ERR_PTR(err);
108 }
109
110 static int is_multimedia_file(const unsigned char *s, const char *sub)
111 {
112 size_t slen = strlen(s);
113 size_t sublen = strlen(sub);
114 int i;
115
116 /*
117 * filename format of multimedia file should be defined as:
118 * "filename + '.' + extension + (optional: '.' + temp extension)".
119 */
120 if (slen < sublen + 2)
121 return 0;
122
123 for (i = 1; i < slen - sublen; i++) {
124 if (s[i] != '.')
125 continue;
126 if (!strncasecmp(s + i + 1, sub, sublen))
127 return 1;
128 }
129
130 return 0;
131 }
132
133 /*
134 * Set multimedia files as cold files for hot/cold data separation
135 */
136 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
137 const unsigned char *name)
138 {
139 int i;
140 __u8 (*extlist)[8] = sbi->raw_super->extension_list;
141
142 int count = le32_to_cpu(sbi->raw_super->extension_count);
143 for (i = 0; i < count; i++) {
144 if (is_multimedia_file(name, extlist[i])) {
145 file_set_cold(inode);
146 break;
147 }
148 }
149 }
150
151 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
152 bool excl)
153 {
154 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
155 struct inode *inode;
156 nid_t ino = 0;
157 int err;
158
159 err = dquot_initialize(dir);
160 if (err)
161 return err;
162
163 inode = f2fs_new_inode(dir, mode);
164 if (IS_ERR(inode))
165 return PTR_ERR(inode);
166
167 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
168 set_cold_files(sbi, inode, dentry->d_name.name);
169
170 inode->i_op = &f2fs_file_inode_operations;
171 inode->i_fop = &f2fs_file_operations;
172 inode->i_mapping->a_ops = &f2fs_dblock_aops;
173 ino = inode->i_ino;
174
175 f2fs_lock_op(sbi);
176 err = f2fs_add_link(dentry, inode);
177 if (err)
178 goto out;
179 f2fs_unlock_op(sbi);
180
181 alloc_nid_done(sbi, ino);
182
183 d_instantiate(dentry, inode);
184 unlock_new_inode(inode);
185
186 if (IS_DIRSYNC(dir))
187 f2fs_sync_fs(sbi->sb, 1);
188
189 f2fs_balance_fs(sbi, true);
190 return 0;
191 out:
192 handle_failed_inode(inode);
193 return err;
194 }
195
196 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
197 struct dentry *dentry)
198 {
199 struct inode *inode = d_inode(old_dentry);
200 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
201 int err;
202
203 if (f2fs_encrypted_inode(dir) &&
204 !fscrypt_has_permitted_context(dir, inode))
205 return -EPERM;
206
207 err = dquot_initialize(dir);
208 if (err)
209 return err;
210
211 f2fs_balance_fs(sbi, true);
212
213 inode->i_ctime = current_time(inode);
214 ihold(inode);
215
216 set_inode_flag(inode, FI_INC_LINK);
217 f2fs_lock_op(sbi);
218 err = f2fs_add_link(dentry, inode);
219 if (err)
220 goto out;
221 f2fs_unlock_op(sbi);
222
223 d_instantiate(dentry, inode);
224
225 if (IS_DIRSYNC(dir))
226 f2fs_sync_fs(sbi->sb, 1);
227 return 0;
228 out:
229 clear_inode_flag(inode, FI_INC_LINK);
230 iput(inode);
231 f2fs_unlock_op(sbi);
232 return err;
233 }
234
235 struct dentry *f2fs_get_parent(struct dentry *child)
236 {
237 struct qstr dotdot = QSTR_INIT("..", 2);
238 struct page *page;
239 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
240 if (!ino) {
241 if (IS_ERR(page))
242 return ERR_CAST(page);
243 return ERR_PTR(-ENOENT);
244 }
245 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
246 }
247
248 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
249 {
250 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
251 struct qstr dot = QSTR_INIT(".", 1);
252 struct qstr dotdot = QSTR_INIT("..", 2);
253 struct f2fs_dir_entry *de;
254 struct page *page;
255 int err = 0;
256
257 if (f2fs_readonly(sbi->sb)) {
258 f2fs_msg(sbi->sb, KERN_INFO,
259 "skip recovering inline_dots inode (ino:%lu, pino:%u) "
260 "in readonly mountpoint", dir->i_ino, pino);
261 return 0;
262 }
263
264 f2fs_balance_fs(sbi, true);
265
266 f2fs_lock_op(sbi);
267
268 de = f2fs_find_entry(dir, &dot, &page);
269 if (de) {
270 f2fs_dentry_kunmap(dir, page);
271 f2fs_put_page(page, 0);
272 } else if (IS_ERR(page)) {
273 err = PTR_ERR(page);
274 goto out;
275 } else {
276 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
277 if (err)
278 goto out;
279 }
280
281 de = f2fs_find_entry(dir, &dotdot, &page);
282 if (de) {
283 f2fs_dentry_kunmap(dir, page);
284 f2fs_put_page(page, 0);
285 } else if (IS_ERR(page)) {
286 err = PTR_ERR(page);
287 } else {
288 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
289 }
290 out:
291 if (!err)
292 clear_inode_flag(dir, FI_INLINE_DOTS);
293
294 f2fs_unlock_op(sbi);
295 return err;
296 }
297
298 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
299 unsigned int flags)
300 {
301 struct inode *inode = NULL;
302 struct f2fs_dir_entry *de;
303 struct page *page;
304 nid_t ino;
305 int err = 0;
306 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
307
308 if (f2fs_encrypted_inode(dir)) {
309 int res = fscrypt_get_encryption_info(dir);
310
311 /*
312 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
313 * created while the directory was encrypted and we
314 * don't have access to the key.
315 */
316 if (fscrypt_has_encryption_key(dir))
317 fscrypt_set_encrypted_dentry(dentry);
318 fscrypt_set_d_op(dentry);
319 if (res && res != -ENOKEY)
320 return ERR_PTR(res);
321 }
322
323 if (dentry->d_name.len > F2FS_NAME_LEN)
324 return ERR_PTR(-ENAMETOOLONG);
325
326 de = f2fs_find_entry(dir, &dentry->d_name, &page);
327 if (!de) {
328 if (IS_ERR(page))
329 return (struct dentry *)page;
330 return d_splice_alias(inode, dentry);
331 }
332
333 ino = le32_to_cpu(de->ino);
334 f2fs_dentry_kunmap(dir, page);
335 f2fs_put_page(page, 0);
336
337 inode = f2fs_iget(dir->i_sb, ino);
338 if (IS_ERR(inode))
339 return ERR_CAST(inode);
340
341 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
342 err = __recover_dot_dentries(dir, root_ino);
343 if (err)
344 goto err_out;
345 }
346
347 if (f2fs_has_inline_dots(inode)) {
348 err = __recover_dot_dentries(inode, dir->i_ino);
349 if (err)
350 goto err_out;
351 }
352 if (f2fs_encrypted_inode(dir) &&
353 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
354 !fscrypt_has_permitted_context(dir, inode)) {
355 f2fs_msg(inode->i_sb, KERN_WARNING,
356 "Inconsistent encryption contexts: %lu/%lu",
357 dir->i_ino, inode->i_ino);
358 err = -EPERM;
359 goto err_out;
360 }
361 return d_splice_alias(inode, dentry);
362
363 err_out:
364 iput(inode);
365 return ERR_PTR(err);
366 }
367
368 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
369 {
370 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
371 struct inode *inode = d_inode(dentry);
372 struct f2fs_dir_entry *de;
373 struct page *page;
374 int err = -ENOENT;
375
376 trace_f2fs_unlink_enter(dir, dentry);
377
378 err = dquot_initialize(dir);
379 if (err)
380 return err;
381
382 de = f2fs_find_entry(dir, &dentry->d_name, &page);
383 if (!de) {
384 if (IS_ERR(page))
385 err = PTR_ERR(page);
386 goto fail;
387 }
388
389 f2fs_balance_fs(sbi, true);
390
391 f2fs_lock_op(sbi);
392 err = acquire_orphan_inode(sbi);
393 if (err) {
394 f2fs_unlock_op(sbi);
395 f2fs_dentry_kunmap(dir, page);
396 f2fs_put_page(page, 0);
397 goto fail;
398 }
399 f2fs_delete_entry(de, page, dir, inode);
400 f2fs_unlock_op(sbi);
401
402 if (IS_DIRSYNC(dir))
403 f2fs_sync_fs(sbi->sb, 1);
404 fail:
405 trace_f2fs_unlink_exit(inode, err);
406 return err;
407 }
408
409 static const char *f2fs_get_link(struct dentry *dentry,
410 struct inode *inode,
411 struct delayed_call *done)
412 {
413 const char *link = page_get_link(dentry, inode, done);
414 if (!IS_ERR(link) && !*link) {
415 /* this is broken symlink case */
416 do_delayed_call(done);
417 clear_delayed_call(done);
418 link = ERR_PTR(-ENOENT);
419 }
420 return link;
421 }
422
423 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
424 const char *symname)
425 {
426 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
427 struct inode *inode;
428 size_t len = strlen(symname);
429 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
430 struct fscrypt_symlink_data *sd = NULL;
431 int err;
432
433 if (f2fs_encrypted_inode(dir)) {
434 err = fscrypt_get_encryption_info(dir);
435 if (err)
436 return err;
437
438 if (!fscrypt_has_encryption_key(dir))
439 return -ENOKEY;
440
441 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
442 sizeof(struct fscrypt_symlink_data));
443 }
444
445 if (disk_link.len > dir->i_sb->s_blocksize)
446 return -ENAMETOOLONG;
447
448 err = dquot_initialize(dir);
449 if (err)
450 return err;
451
452 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
453 if (IS_ERR(inode))
454 return PTR_ERR(inode);
455
456 if (f2fs_encrypted_inode(inode))
457 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
458 else
459 inode->i_op = &f2fs_symlink_inode_operations;
460 inode_nohighmem(inode);
461 inode->i_mapping->a_ops = &f2fs_dblock_aops;
462
463 f2fs_lock_op(sbi);
464 err = f2fs_add_link(dentry, inode);
465 if (err)
466 goto out;
467 f2fs_unlock_op(sbi);
468 alloc_nid_done(sbi, inode->i_ino);
469
470 if (f2fs_encrypted_inode(inode)) {
471 struct qstr istr = QSTR_INIT(symname, len);
472 struct fscrypt_str ostr;
473
474 sd = kzalloc(disk_link.len, GFP_NOFS);
475 if (!sd) {
476 err = -ENOMEM;
477 goto err_out;
478 }
479
480 err = fscrypt_get_encryption_info(inode);
481 if (err)
482 goto err_out;
483
484 if (!fscrypt_has_encryption_key(inode)) {
485 err = -ENOKEY;
486 goto err_out;
487 }
488
489 ostr.name = sd->encrypted_path;
490 ostr.len = disk_link.len;
491 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
492 if (err)
493 goto err_out;
494
495 sd->len = cpu_to_le16(ostr.len);
496 disk_link.name = (char *)sd;
497 }
498
499 err = page_symlink(inode, disk_link.name, disk_link.len);
500
501 err_out:
502 d_instantiate(dentry, inode);
503 unlock_new_inode(inode);
504
505 /*
506 * Let's flush symlink data in order to avoid broken symlink as much as
507 * possible. Nevertheless, fsyncing is the best way, but there is no
508 * way to get a file descriptor in order to flush that.
509 *
510 * Note that, it needs to do dir->fsync to make this recoverable.
511 * If the symlink path is stored into inline_data, there is no
512 * performance regression.
513 */
514 if (!err) {
515 filemap_write_and_wait_range(inode->i_mapping, 0,
516 disk_link.len - 1);
517
518 if (IS_DIRSYNC(dir))
519 f2fs_sync_fs(sbi->sb, 1);
520 } else {
521 f2fs_unlink(dir, dentry);
522 }
523
524 kfree(sd);
525
526 f2fs_balance_fs(sbi, true);
527 return err;
528 out:
529 handle_failed_inode(inode);
530 return err;
531 }
532
533 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
534 {
535 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
536 struct inode *inode;
537 int err;
538
539 err = dquot_initialize(dir);
540 if (err)
541 return err;
542
543 inode = f2fs_new_inode(dir, S_IFDIR | mode);
544 if (IS_ERR(inode))
545 return PTR_ERR(inode);
546
547 inode->i_op = &f2fs_dir_inode_operations;
548 inode->i_fop = &f2fs_dir_operations;
549 inode->i_mapping->a_ops = &f2fs_dblock_aops;
550 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
551
552 set_inode_flag(inode, FI_INC_LINK);
553 f2fs_lock_op(sbi);
554 err = f2fs_add_link(dentry, inode);
555 if (err)
556 goto out_fail;
557 f2fs_unlock_op(sbi);
558
559 alloc_nid_done(sbi, inode->i_ino);
560
561 d_instantiate(dentry, inode);
562 unlock_new_inode(inode);
563
564 if (IS_DIRSYNC(dir))
565 f2fs_sync_fs(sbi->sb, 1);
566
567 f2fs_balance_fs(sbi, true);
568 return 0;
569
570 out_fail:
571 clear_inode_flag(inode, FI_INC_LINK);
572 handle_failed_inode(inode);
573 return err;
574 }
575
576 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
577 {
578 struct inode *inode = d_inode(dentry);
579 if (f2fs_empty_dir(inode))
580 return f2fs_unlink(dir, dentry);
581 return -ENOTEMPTY;
582 }
583
584 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
585 umode_t mode, dev_t rdev)
586 {
587 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
588 struct inode *inode;
589 int err = 0;
590
591 err = dquot_initialize(dir);
592 if (err)
593 return err;
594
595 inode = f2fs_new_inode(dir, mode);
596 if (IS_ERR(inode))
597 return PTR_ERR(inode);
598
599 init_special_inode(inode, inode->i_mode, rdev);
600 inode->i_op = &f2fs_special_inode_operations;
601
602 f2fs_lock_op(sbi);
603 err = f2fs_add_link(dentry, inode);
604 if (err)
605 goto out;
606 f2fs_unlock_op(sbi);
607
608 alloc_nid_done(sbi, inode->i_ino);
609
610 d_instantiate(dentry, inode);
611 unlock_new_inode(inode);
612
613 if (IS_DIRSYNC(dir))
614 f2fs_sync_fs(sbi->sb, 1);
615
616 f2fs_balance_fs(sbi, true);
617 return 0;
618 out:
619 handle_failed_inode(inode);
620 return err;
621 }
622
623 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
624 umode_t mode, struct inode **whiteout)
625 {
626 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
627 struct inode *inode;
628 int err;
629
630 err = dquot_initialize(dir);
631 if (err)
632 return err;
633
634 inode = f2fs_new_inode(dir, mode);
635 if (IS_ERR(inode))
636 return PTR_ERR(inode);
637
638 if (whiteout) {
639 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
640 inode->i_op = &f2fs_special_inode_operations;
641 } else {
642 inode->i_op = &f2fs_file_inode_operations;
643 inode->i_fop = &f2fs_file_operations;
644 inode->i_mapping->a_ops = &f2fs_dblock_aops;
645 }
646
647 f2fs_lock_op(sbi);
648 err = acquire_orphan_inode(sbi);
649 if (err)
650 goto out;
651
652 err = f2fs_do_tmpfile(inode, dir);
653 if (err)
654 goto release_out;
655
656 /*
657 * add this non-linked tmpfile to orphan list, in this way we could
658 * remove all unused data of tmpfile after abnormal power-off.
659 */
660 add_orphan_inode(inode);
661 alloc_nid_done(sbi, inode->i_ino);
662
663 if (whiteout) {
664 f2fs_i_links_write(inode, false);
665 *whiteout = inode;
666 } else {
667 d_tmpfile(dentry, inode);
668 }
669 /* link_count was changed by d_tmpfile as well. */
670 f2fs_unlock_op(sbi);
671 unlock_new_inode(inode);
672
673 f2fs_balance_fs(sbi, true);
674 return 0;
675
676 release_out:
677 release_orphan_inode(sbi);
678 out:
679 handle_failed_inode(inode);
680 return err;
681 }
682
683 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
684 {
685 if (f2fs_encrypted_inode(dir)) {
686 int err = fscrypt_get_encryption_info(dir);
687 if (err)
688 return err;
689 }
690
691 return __f2fs_tmpfile(dir, dentry, mode, NULL);
692 }
693
694 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
695 {
696 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
697 }
698
699 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
700 struct inode *new_dir, struct dentry *new_dentry,
701 unsigned int flags)
702 {
703 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
704 struct inode *old_inode = d_inode(old_dentry);
705 struct inode *new_inode = d_inode(new_dentry);
706 struct inode *whiteout = NULL;
707 struct page *old_dir_page;
708 struct page *old_page, *new_page = NULL;
709 struct f2fs_dir_entry *old_dir_entry = NULL;
710 struct f2fs_dir_entry *old_entry;
711 struct f2fs_dir_entry *new_entry;
712 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
713 int err = -ENOENT;
714
715 if ((f2fs_encrypted_inode(old_dir) &&
716 !fscrypt_has_encryption_key(old_dir)) ||
717 (f2fs_encrypted_inode(new_dir) &&
718 !fscrypt_has_encryption_key(new_dir)))
719 return -ENOKEY;
720
721 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
722 !fscrypt_has_permitted_context(new_dir, old_inode)) {
723 err = -EPERM;
724 goto out;
725 }
726
727 err = dquot_initialize(old_dir);
728 if (err)
729 goto out;
730
731 err = dquot_initialize(new_dir);
732 if (err)
733 goto out;
734
735 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
736 if (!old_entry) {
737 if (IS_ERR(old_page))
738 err = PTR_ERR(old_page);
739 goto out;
740 }
741
742 if (S_ISDIR(old_inode->i_mode)) {
743 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
744 if (!old_dir_entry) {
745 if (IS_ERR(old_dir_page))
746 err = PTR_ERR(old_dir_page);
747 goto out_old;
748 }
749 }
750
751 if (flags & RENAME_WHITEOUT) {
752 err = f2fs_create_whiteout(old_dir, &whiteout);
753 if (err)
754 goto out_dir;
755 }
756
757 if (new_inode) {
758
759 err = -ENOTEMPTY;
760 if (old_dir_entry && !f2fs_empty_dir(new_inode))
761 goto out_whiteout;
762
763 err = -ENOENT;
764 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
765 &new_page);
766 if (!new_entry) {
767 if (IS_ERR(new_page))
768 err = PTR_ERR(new_page);
769 goto out_whiteout;
770 }
771
772 f2fs_balance_fs(sbi, true);
773
774 f2fs_lock_op(sbi);
775
776 err = acquire_orphan_inode(sbi);
777 if (err)
778 goto put_out_dir;
779
780 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
781
782 new_inode->i_ctime = current_time(new_inode);
783 down_write(&F2FS_I(new_inode)->i_sem);
784 if (old_dir_entry)
785 f2fs_i_links_write(new_inode, false);
786 f2fs_i_links_write(new_inode, false);
787 up_write(&F2FS_I(new_inode)->i_sem);
788
789 if (!new_inode->i_nlink)
790 add_orphan_inode(new_inode);
791 else
792 release_orphan_inode(sbi);
793 } else {
794 f2fs_balance_fs(sbi, true);
795
796 f2fs_lock_op(sbi);
797
798 err = f2fs_add_link(new_dentry, old_inode);
799 if (err) {
800 f2fs_unlock_op(sbi);
801 goto out_whiteout;
802 }
803
804 if (old_dir_entry)
805 f2fs_i_links_write(new_dir, true);
806
807 /*
808 * old entry and new entry can locate in the same inline
809 * dentry in inode, when attaching new entry in inline dentry,
810 * it could force inline dentry conversion, after that,
811 * old_entry and old_page will point to wrong address, in
812 * order to avoid this, let's do the check and update here.
813 */
814 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
815 f2fs_put_page(old_page, 0);
816 old_page = NULL;
817
818 old_entry = f2fs_find_entry(old_dir,
819 &old_dentry->d_name, &old_page);
820 if (!old_entry) {
821 err = -ENOENT;
822 if (IS_ERR(old_page))
823 err = PTR_ERR(old_page);
824 f2fs_unlock_op(sbi);
825 goto out_whiteout;
826 }
827 }
828 }
829
830 down_write(&F2FS_I(old_inode)->i_sem);
831 if (!old_dir_entry || whiteout)
832 file_lost_pino(old_inode);
833 else
834 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
835 up_write(&F2FS_I(old_inode)->i_sem);
836
837 old_inode->i_ctime = current_time(old_inode);
838 f2fs_mark_inode_dirty_sync(old_inode, false);
839
840 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
841
842 if (whiteout) {
843 whiteout->i_state |= I_LINKABLE;
844 set_inode_flag(whiteout, FI_INC_LINK);
845 err = f2fs_add_link(old_dentry, whiteout);
846 if (err)
847 goto put_out_dir;
848 whiteout->i_state &= ~I_LINKABLE;
849 iput(whiteout);
850 }
851
852 if (old_dir_entry) {
853 if (old_dir != new_dir && !whiteout) {
854 f2fs_set_link(old_inode, old_dir_entry,
855 old_dir_page, new_dir);
856 } else {
857 f2fs_dentry_kunmap(old_inode, old_dir_page);
858 f2fs_put_page(old_dir_page, 0);
859 }
860 f2fs_i_links_write(old_dir, false);
861 }
862
863 f2fs_unlock_op(sbi);
864
865 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
866 f2fs_sync_fs(sbi->sb, 1);
867 return 0;
868
869 put_out_dir:
870 f2fs_unlock_op(sbi);
871 if (new_page) {
872 f2fs_dentry_kunmap(new_dir, new_page);
873 f2fs_put_page(new_page, 0);
874 }
875 out_whiteout:
876 if (whiteout)
877 iput(whiteout);
878 out_dir:
879 if (old_dir_entry) {
880 f2fs_dentry_kunmap(old_inode, old_dir_page);
881 f2fs_put_page(old_dir_page, 0);
882 }
883 out_old:
884 f2fs_dentry_kunmap(old_dir, old_page);
885 f2fs_put_page(old_page, 0);
886 out:
887 return err;
888 }
889
890 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
891 struct inode *new_dir, struct dentry *new_dentry)
892 {
893 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
894 struct inode *old_inode = d_inode(old_dentry);
895 struct inode *new_inode = d_inode(new_dentry);
896 struct page *old_dir_page, *new_dir_page;
897 struct page *old_page, *new_page;
898 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
899 struct f2fs_dir_entry *old_entry, *new_entry;
900 int old_nlink = 0, new_nlink = 0;
901 int err = -ENOENT;
902
903 if ((f2fs_encrypted_inode(old_dir) &&
904 !fscrypt_has_encryption_key(old_dir)) ||
905 (f2fs_encrypted_inode(new_dir) &&
906 !fscrypt_has_encryption_key(new_dir)))
907 return -ENOKEY;
908
909 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
910 (old_dir != new_dir) &&
911 (!fscrypt_has_permitted_context(new_dir, old_inode) ||
912 !fscrypt_has_permitted_context(old_dir, new_inode)))
913 return -EPERM;
914
915 err = dquot_initialize(old_dir);
916 if (err)
917 goto out;
918
919 err = dquot_initialize(new_dir);
920 if (err)
921 goto out;
922
923 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
924 if (!old_entry) {
925 if (IS_ERR(old_page))
926 err = PTR_ERR(old_page);
927 goto out;
928 }
929
930 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
931 if (!new_entry) {
932 if (IS_ERR(new_page))
933 err = PTR_ERR(new_page);
934 goto out_old;
935 }
936
937 /* prepare for updating ".." directory entry info later */
938 if (old_dir != new_dir) {
939 if (S_ISDIR(old_inode->i_mode)) {
940 old_dir_entry = f2fs_parent_dir(old_inode,
941 &old_dir_page);
942 if (!old_dir_entry) {
943 if (IS_ERR(old_dir_page))
944 err = PTR_ERR(old_dir_page);
945 goto out_new;
946 }
947 }
948
949 if (S_ISDIR(new_inode->i_mode)) {
950 new_dir_entry = f2fs_parent_dir(new_inode,
951 &new_dir_page);
952 if (!new_dir_entry) {
953 if (IS_ERR(new_dir_page))
954 err = PTR_ERR(new_dir_page);
955 goto out_old_dir;
956 }
957 }
958 }
959
960 /*
961 * If cross rename between file and directory those are not
962 * in the same directory, we will inc nlink of file's parent
963 * later, so we should check upper boundary of its nlink.
964 */
965 if ((!old_dir_entry || !new_dir_entry) &&
966 old_dir_entry != new_dir_entry) {
967 old_nlink = old_dir_entry ? -1 : 1;
968 new_nlink = -old_nlink;
969 err = -EMLINK;
970 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
971 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
972 goto out_new_dir;
973 }
974
975 f2fs_balance_fs(sbi, true);
976
977 f2fs_lock_op(sbi);
978
979 /* update ".." directory entry info of old dentry */
980 if (old_dir_entry)
981 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
982
983 /* update ".." directory entry info of new dentry */
984 if (new_dir_entry)
985 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
986
987 /* update directory entry info of old dir inode */
988 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
989
990 down_write(&F2FS_I(old_inode)->i_sem);
991 file_lost_pino(old_inode);
992 up_write(&F2FS_I(old_inode)->i_sem);
993
994 old_dir->i_ctime = current_time(old_dir);
995 if (old_nlink) {
996 down_write(&F2FS_I(old_dir)->i_sem);
997 f2fs_i_links_write(old_dir, old_nlink > 0);
998 up_write(&F2FS_I(old_dir)->i_sem);
999 }
1000 f2fs_mark_inode_dirty_sync(old_dir, false);
1001
1002 /* update directory entry info of new dir inode */
1003 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1004
1005 down_write(&F2FS_I(new_inode)->i_sem);
1006 file_lost_pino(new_inode);
1007 up_write(&F2FS_I(new_inode)->i_sem);
1008
1009 new_dir->i_ctime = current_time(new_dir);
1010 if (new_nlink) {
1011 down_write(&F2FS_I(new_dir)->i_sem);
1012 f2fs_i_links_write(new_dir, new_nlink > 0);
1013 up_write(&F2FS_I(new_dir)->i_sem);
1014 }
1015 f2fs_mark_inode_dirty_sync(new_dir, false);
1016
1017 f2fs_unlock_op(sbi);
1018
1019 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1020 f2fs_sync_fs(sbi->sb, 1);
1021 return 0;
1022 out_new_dir:
1023 if (new_dir_entry) {
1024 f2fs_dentry_kunmap(new_inode, new_dir_page);
1025 f2fs_put_page(new_dir_page, 0);
1026 }
1027 out_old_dir:
1028 if (old_dir_entry) {
1029 f2fs_dentry_kunmap(old_inode, old_dir_page);
1030 f2fs_put_page(old_dir_page, 0);
1031 }
1032 out_new:
1033 f2fs_dentry_kunmap(new_dir, new_page);
1034 f2fs_put_page(new_page, 0);
1035 out_old:
1036 f2fs_dentry_kunmap(old_dir, old_page);
1037 f2fs_put_page(old_page, 0);
1038 out:
1039 return err;
1040 }
1041
1042 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1043 struct inode *new_dir, struct dentry *new_dentry,
1044 unsigned int flags)
1045 {
1046 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1047 return -EINVAL;
1048
1049 if (flags & RENAME_EXCHANGE) {
1050 return f2fs_cross_rename(old_dir, old_dentry,
1051 new_dir, new_dentry);
1052 }
1053 /*
1054 * VFS has already handled the new dentry existence case,
1055 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1056 */
1057 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1058 }
1059
1060 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1061 struct inode *inode,
1062 struct delayed_call *done)
1063 {
1064 struct page *cpage = NULL;
1065 char *caddr, *paddr = NULL;
1066 struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1067 struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1068 struct fscrypt_symlink_data *sd;
1069 u32 max_size = inode->i_sb->s_blocksize;
1070 int res;
1071
1072 if (!dentry)
1073 return ERR_PTR(-ECHILD);
1074
1075 res = fscrypt_get_encryption_info(inode);
1076 if (res)
1077 return ERR_PTR(res);
1078
1079 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1080 if (IS_ERR(cpage))
1081 return ERR_CAST(cpage);
1082 caddr = page_address(cpage);
1083
1084 /* Symlink is encrypted */
1085 sd = (struct fscrypt_symlink_data *)caddr;
1086 cstr.name = sd->encrypted_path;
1087 cstr.len = le16_to_cpu(sd->len);
1088
1089 /* this is broken symlink case */
1090 if (unlikely(cstr.len == 0)) {
1091 res = -ENOENT;
1092 goto errout;
1093 }
1094
1095 if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1096 /* Symlink data on the disk is corrupted */
1097 res = -EIO;
1098 goto errout;
1099 }
1100 res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1101 if (res)
1102 goto errout;
1103
1104 res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1105 if (res)
1106 goto errout;
1107
1108 /* this is broken symlink case */
1109 if (unlikely(pstr.name[0] == 0)) {
1110 res = -ENOENT;
1111 goto errout;
1112 }
1113
1114 paddr = pstr.name;
1115
1116 /* Null-terminate the name */
1117 paddr[pstr.len] = '\0';
1118
1119 put_page(cpage);
1120 set_delayed_call(done, kfree_link, paddr);
1121 return paddr;
1122 errout:
1123 fscrypt_fname_free_buffer(&pstr);
1124 put_page(cpage);
1125 return ERR_PTR(res);
1126 }
1127
1128 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1129 .get_link = f2fs_encrypted_get_link,
1130 .getattr = f2fs_getattr,
1131 .setattr = f2fs_setattr,
1132 #ifdef CONFIG_F2FS_FS_XATTR
1133 .listxattr = f2fs_listxattr,
1134 #endif
1135 };
1136
1137 const struct inode_operations f2fs_dir_inode_operations = {
1138 .create = f2fs_create,
1139 .lookup = f2fs_lookup,
1140 .link = f2fs_link,
1141 .unlink = f2fs_unlink,
1142 .symlink = f2fs_symlink,
1143 .mkdir = f2fs_mkdir,
1144 .rmdir = f2fs_rmdir,
1145 .mknod = f2fs_mknod,
1146 .rename = f2fs_rename2,
1147 .tmpfile = f2fs_tmpfile,
1148 .getattr = f2fs_getattr,
1149 .setattr = f2fs_setattr,
1150 .get_acl = f2fs_get_acl,
1151 .set_acl = f2fs_set_acl,
1152 #ifdef CONFIG_F2FS_FS_XATTR
1153 .listxattr = f2fs_listxattr,
1154 #endif
1155 };
1156
1157 const struct inode_operations f2fs_symlink_inode_operations = {
1158 .get_link = f2fs_get_link,
1159 .getattr = f2fs_getattr,
1160 .setattr = f2fs_setattr,
1161 #ifdef CONFIG_F2FS_FS_XATTR
1162 .listxattr = f2fs_listxattr,
1163 #endif
1164 };
1165
1166 const struct inode_operations f2fs_special_inode_operations = {
1167 .getattr = f2fs_getattr,
1168 .setattr = f2fs_setattr,
1169 .get_acl = f2fs_get_acl,
1170 .set_acl = f2fs_set_acl,
1171 #ifdef CONFIG_F2FS_FS_XATTR
1172 .listxattr = f2fs_listxattr,
1173 #endif
1174 };
Ubuntu Artful kernel mirror