Merge tag 'for-f2fs-4.12' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk...
[sfrench/cifs-2.6.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(inode);
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         int i;
95
96         /*
97          * filename format of multimedia file should be defined as:
98          * "filename + '.' + extension + (optional: '.' + temp extension)".
99          */
100         if (slen < sublen + 2)
101                 return 0;
102
103         for (i = 1; i < slen - sublen; i++) {
104                 if (s[i] != '.')
105                         continue;
106                 if (!strncasecmp(s + i + 1, sub, sublen))
107                         return 1;
108         }
109
110         return 0;
111 }
112
113 /*
114  * Set multimedia files as cold files for hot/cold data separation
115  */
116 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
117                 const unsigned char *name)
118 {
119         int i;
120         __u8 (*extlist)[8] = sbi->raw_super->extension_list;
121
122         int count = le32_to_cpu(sbi->raw_super->extension_count);
123         for (i = 0; i < count; i++) {
124                 if (is_multimedia_file(name, extlist[i])) {
125                         file_set_cold(inode);
126                         break;
127                 }
128         }
129 }
130
131 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
132                                                 bool excl)
133 {
134         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
135         struct inode *inode;
136         nid_t ino = 0;
137         int err;
138
139         inode = f2fs_new_inode(dir, mode);
140         if (IS_ERR(inode))
141                 return PTR_ERR(inode);
142
143         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
144                 set_cold_files(sbi, inode, dentry->d_name.name);
145
146         inode->i_op = &f2fs_file_inode_operations;
147         inode->i_fop = &f2fs_file_operations;
148         inode->i_mapping->a_ops = &f2fs_dblock_aops;
149         ino = inode->i_ino;
150
151         f2fs_lock_op(sbi);
152         err = f2fs_add_link(dentry, inode);
153         if (err)
154                 goto out;
155         f2fs_unlock_op(sbi);
156
157         alloc_nid_done(sbi, ino);
158
159         d_instantiate(dentry, inode);
160         unlock_new_inode(inode);
161
162         if (IS_DIRSYNC(dir))
163                 f2fs_sync_fs(sbi->sb, 1);
164
165         f2fs_balance_fs(sbi, true);
166         return 0;
167 out:
168         handle_failed_inode(inode);
169         return err;
170 }
171
172 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
173                 struct dentry *dentry)
174 {
175         struct inode *inode = d_inode(old_dentry);
176         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
177         int err;
178
179         if (f2fs_encrypted_inode(dir) &&
180                         !fscrypt_has_permitted_context(dir, inode))
181                 return -EPERM;
182
183         f2fs_balance_fs(sbi, true);
184
185         inode->i_ctime = current_time(inode);
186         ihold(inode);
187
188         set_inode_flag(inode, FI_INC_LINK);
189         f2fs_lock_op(sbi);
190         err = f2fs_add_link(dentry, inode);
191         if (err)
192                 goto out;
193         f2fs_unlock_op(sbi);
194
195         d_instantiate(dentry, inode);
196
197         if (IS_DIRSYNC(dir))
198                 f2fs_sync_fs(sbi->sb, 1);
199         return 0;
200 out:
201         clear_inode_flag(inode, FI_INC_LINK);
202         iput(inode);
203         f2fs_unlock_op(sbi);
204         return err;
205 }
206
207 struct dentry *f2fs_get_parent(struct dentry *child)
208 {
209         struct qstr dotdot = QSTR_INIT("..", 2);
210         struct page *page;
211         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
212         if (!ino) {
213                 if (IS_ERR(page))
214                         return ERR_CAST(page);
215                 return ERR_PTR(-ENOENT);
216         }
217         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
218 }
219
220 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
221 {
222         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
223         struct qstr dot = QSTR_INIT(".", 1);
224         struct qstr dotdot = QSTR_INIT("..", 2);
225         struct f2fs_dir_entry *de;
226         struct page *page;
227         int err = 0;
228
229         if (f2fs_readonly(sbi->sb)) {
230                 f2fs_msg(sbi->sb, KERN_INFO,
231                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
232                         "in readonly mountpoint", dir->i_ino, pino);
233                 return 0;
234         }
235
236         f2fs_balance_fs(sbi, true);
237
238         f2fs_lock_op(sbi);
239
240         de = f2fs_find_entry(dir, &dot, &page);
241         if (de) {
242                 f2fs_dentry_kunmap(dir, page);
243                 f2fs_put_page(page, 0);
244         } else if (IS_ERR(page)) {
245                 err = PTR_ERR(page);
246                 goto out;
247         } else {
248                 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
249                 if (err)
250                         goto out;
251         }
252
253         de = f2fs_find_entry(dir, &dotdot, &page);
254         if (de) {
255                 f2fs_dentry_kunmap(dir, page);
256                 f2fs_put_page(page, 0);
257         } else if (IS_ERR(page)) {
258                 err = PTR_ERR(page);
259         } else {
260                 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
261         }
262 out:
263         if (!err)
264                 clear_inode_flag(dir, FI_INLINE_DOTS);
265
266         f2fs_unlock_op(sbi);
267         return err;
268 }
269
270 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
271                 unsigned int flags)
272 {
273         struct inode *inode = NULL;
274         struct f2fs_dir_entry *de;
275         struct page *page;
276         nid_t ino;
277         int err = 0;
278         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
279
280         if (f2fs_encrypted_inode(dir)) {
281                 int res = fscrypt_get_encryption_info(dir);
282
283                 /*
284                  * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
285                  * created while the directory was encrypted and we
286                  * don't have access to the key.
287                  */
288                 if (fscrypt_has_encryption_key(dir))
289                         fscrypt_set_encrypted_dentry(dentry);
290                 fscrypt_set_d_op(dentry);
291                 if (res && res != -ENOKEY)
292                         return ERR_PTR(res);
293         }
294
295         if (dentry->d_name.len > F2FS_NAME_LEN)
296                 return ERR_PTR(-ENAMETOOLONG);
297
298         de = f2fs_find_entry(dir, &dentry->d_name, &page);
299         if (!de) {
300                 if (IS_ERR(page))
301                         return (struct dentry *)page;
302                 return d_splice_alias(inode, dentry);
303         }
304
305         ino = le32_to_cpu(de->ino);
306         f2fs_dentry_kunmap(dir, page);
307         f2fs_put_page(page, 0);
308
309         inode = f2fs_iget(dir->i_sb, ino);
310         if (IS_ERR(inode))
311                 return ERR_CAST(inode);
312
313         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
314                 err = __recover_dot_dentries(dir, root_ino);
315                 if (err)
316                         goto err_out;
317         }
318
319         if (f2fs_has_inline_dots(inode)) {
320                 err = __recover_dot_dentries(inode, dir->i_ino);
321                 if (err)
322                         goto err_out;
323         }
324         if (f2fs_encrypted_inode(dir) &&
325             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
326             !fscrypt_has_permitted_context(dir, inode)) {
327                 f2fs_msg(inode->i_sb, KERN_WARNING,
328                          "Inconsistent encryption contexts: %lu/%lu",
329                          dir->i_ino, inode->i_ino);
330                 err = -EPERM;
331                 goto err_out;
332         }
333         return d_splice_alias(inode, dentry);
334
335 err_out:
336         iput(inode);
337         return ERR_PTR(err);
338 }
339
340 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
341 {
342         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
343         struct inode *inode = d_inode(dentry);
344         struct f2fs_dir_entry *de;
345         struct page *page;
346         int err = -ENOENT;
347
348         trace_f2fs_unlink_enter(dir, dentry);
349
350         de = f2fs_find_entry(dir, &dentry->d_name, &page);
351         if (!de) {
352                 if (IS_ERR(page))
353                         err = PTR_ERR(page);
354                 goto fail;
355         }
356
357         f2fs_balance_fs(sbi, true);
358
359         f2fs_lock_op(sbi);
360         err = acquire_orphan_inode(sbi);
361         if (err) {
362                 f2fs_unlock_op(sbi);
363                 f2fs_dentry_kunmap(dir, page);
364                 f2fs_put_page(page, 0);
365                 goto fail;
366         }
367         f2fs_delete_entry(de, page, dir, inode);
368         f2fs_unlock_op(sbi);
369
370         if (IS_DIRSYNC(dir))
371                 f2fs_sync_fs(sbi->sb, 1);
372 fail:
373         trace_f2fs_unlink_exit(inode, err);
374         return err;
375 }
376
377 static const char *f2fs_get_link(struct dentry *dentry,
378                                  struct inode *inode,
379                                  struct delayed_call *done)
380 {
381         const char *link = page_get_link(dentry, inode, done);
382         if (!IS_ERR(link) && !*link) {
383                 /* this is broken symlink case */
384                 do_delayed_call(done);
385                 clear_delayed_call(done);
386                 link = ERR_PTR(-ENOENT);
387         }
388         return link;
389 }
390
391 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
392                                         const char *symname)
393 {
394         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
395         struct inode *inode;
396         size_t len = strlen(symname);
397         struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
398         struct fscrypt_symlink_data *sd = NULL;
399         int err;
400
401         if (f2fs_encrypted_inode(dir)) {
402                 err = fscrypt_get_encryption_info(dir);
403                 if (err)
404                         return err;
405
406                 if (!fscrypt_has_encryption_key(dir))
407                         return -ENOKEY;
408
409                 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
410                                 sizeof(struct fscrypt_symlink_data));
411         }
412
413         if (disk_link.len > dir->i_sb->s_blocksize)
414                 return -ENAMETOOLONG;
415
416         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
417         if (IS_ERR(inode))
418                 return PTR_ERR(inode);
419
420         if (f2fs_encrypted_inode(inode))
421                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
422         else
423                 inode->i_op = &f2fs_symlink_inode_operations;
424         inode_nohighmem(inode);
425         inode->i_mapping->a_ops = &f2fs_dblock_aops;
426
427         f2fs_lock_op(sbi);
428         err = f2fs_add_link(dentry, inode);
429         if (err)
430                 goto out;
431         f2fs_unlock_op(sbi);
432         alloc_nid_done(sbi, inode->i_ino);
433
434         if (f2fs_encrypted_inode(inode)) {
435                 struct qstr istr = QSTR_INIT(symname, len);
436                 struct fscrypt_str ostr;
437
438                 sd = kzalloc(disk_link.len, GFP_NOFS);
439                 if (!sd) {
440                         err = -ENOMEM;
441                         goto err_out;
442                 }
443
444                 err = fscrypt_get_encryption_info(inode);
445                 if (err)
446                         goto err_out;
447
448                 if (!fscrypt_has_encryption_key(inode)) {
449                         err = -ENOKEY;
450                         goto err_out;
451                 }
452
453                 ostr.name = sd->encrypted_path;
454                 ostr.len = disk_link.len;
455                 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
456                 if (err)
457                         goto err_out;
458
459                 sd->len = cpu_to_le16(ostr.len);
460                 disk_link.name = (char *)sd;
461         }
462
463         err = page_symlink(inode, disk_link.name, disk_link.len);
464
465 err_out:
466         d_instantiate(dentry, inode);
467         unlock_new_inode(inode);
468
469         /*
470          * Let's flush symlink data in order to avoid broken symlink as much as
471          * possible. Nevertheless, fsyncing is the best way, but there is no
472          * way to get a file descriptor in order to flush that.
473          *
474          * Note that, it needs to do dir->fsync to make this recoverable.
475          * If the symlink path is stored into inline_data, there is no
476          * performance regression.
477          */
478         if (!err) {
479                 filemap_write_and_wait_range(inode->i_mapping, 0,
480                                                         disk_link.len - 1);
481
482                 if (IS_DIRSYNC(dir))
483                         f2fs_sync_fs(sbi->sb, 1);
484         } else {
485                 f2fs_unlink(dir, dentry);
486         }
487
488         kfree(sd);
489
490         f2fs_balance_fs(sbi, true);
491         return err;
492 out:
493         handle_failed_inode(inode);
494         return err;
495 }
496
497 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
498 {
499         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
500         struct inode *inode;
501         int err;
502
503         inode = f2fs_new_inode(dir, S_IFDIR | mode);
504         if (IS_ERR(inode))
505                 return PTR_ERR(inode);
506
507         inode->i_op = &f2fs_dir_inode_operations;
508         inode->i_fop = &f2fs_dir_operations;
509         inode->i_mapping->a_ops = &f2fs_dblock_aops;
510         mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
511
512         set_inode_flag(inode, FI_INC_LINK);
513         f2fs_lock_op(sbi);
514         err = f2fs_add_link(dentry, inode);
515         if (err)
516                 goto out_fail;
517         f2fs_unlock_op(sbi);
518
519         alloc_nid_done(sbi, inode->i_ino);
520
521         d_instantiate(dentry, inode);
522         unlock_new_inode(inode);
523
524         if (IS_DIRSYNC(dir))
525                 f2fs_sync_fs(sbi->sb, 1);
526
527         f2fs_balance_fs(sbi, true);
528         return 0;
529
530 out_fail:
531         clear_inode_flag(inode, FI_INC_LINK);
532         handle_failed_inode(inode);
533         return err;
534 }
535
536 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
537 {
538         struct inode *inode = d_inode(dentry);
539         if (f2fs_empty_dir(inode))
540                 return f2fs_unlink(dir, dentry);
541         return -ENOTEMPTY;
542 }
543
544 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
545                                 umode_t mode, dev_t rdev)
546 {
547         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
548         struct inode *inode;
549         int err = 0;
550
551         inode = f2fs_new_inode(dir, mode);
552         if (IS_ERR(inode))
553                 return PTR_ERR(inode);
554
555         init_special_inode(inode, inode->i_mode, rdev);
556         inode->i_op = &f2fs_special_inode_operations;
557
558         f2fs_lock_op(sbi);
559         err = f2fs_add_link(dentry, inode);
560         if (err)
561                 goto out;
562         f2fs_unlock_op(sbi);
563
564         alloc_nid_done(sbi, inode->i_ino);
565
566         d_instantiate(dentry, inode);
567         unlock_new_inode(inode);
568
569         if (IS_DIRSYNC(dir))
570                 f2fs_sync_fs(sbi->sb, 1);
571
572         f2fs_balance_fs(sbi, true);
573         return 0;
574 out:
575         handle_failed_inode(inode);
576         return err;
577 }
578
579 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
580                                         umode_t mode, struct inode **whiteout)
581 {
582         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
583         struct inode *inode;
584         int err;
585
586         inode = f2fs_new_inode(dir, mode);
587         if (IS_ERR(inode))
588                 return PTR_ERR(inode);
589
590         if (whiteout) {
591                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
592                 inode->i_op = &f2fs_special_inode_operations;
593         } else {
594                 inode->i_op = &f2fs_file_inode_operations;
595                 inode->i_fop = &f2fs_file_operations;
596                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
597         }
598
599         f2fs_lock_op(sbi);
600         err = acquire_orphan_inode(sbi);
601         if (err)
602                 goto out;
603
604         err = f2fs_do_tmpfile(inode, dir);
605         if (err)
606                 goto release_out;
607
608         /*
609          * add this non-linked tmpfile to orphan list, in this way we could
610          * remove all unused data of tmpfile after abnormal power-off.
611          */
612         add_orphan_inode(inode);
613         alloc_nid_done(sbi, inode->i_ino);
614
615         if (whiteout) {
616                 f2fs_i_links_write(inode, false);
617                 *whiteout = inode;
618         } else {
619                 d_tmpfile(dentry, inode);
620         }
621         /* link_count was changed by d_tmpfile as well. */
622         f2fs_unlock_op(sbi);
623         unlock_new_inode(inode);
624
625         f2fs_balance_fs(sbi, true);
626         return 0;
627
628 release_out:
629         release_orphan_inode(sbi);
630 out:
631         handle_failed_inode(inode);
632         return err;
633 }
634
635 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
636 {
637         if (f2fs_encrypted_inode(dir)) {
638                 int err = fscrypt_get_encryption_info(dir);
639                 if (err)
640                         return err;
641         }
642
643         return __f2fs_tmpfile(dir, dentry, mode, NULL);
644 }
645
646 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
647 {
648         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
649 }
650
651 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
652                         struct inode *new_dir, struct dentry *new_dentry,
653                         unsigned int flags)
654 {
655         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
656         struct inode *old_inode = d_inode(old_dentry);
657         struct inode *new_inode = d_inode(new_dentry);
658         struct inode *whiteout = NULL;
659         struct page *old_dir_page;
660         struct page *old_page, *new_page = NULL;
661         struct f2fs_dir_entry *old_dir_entry = NULL;
662         struct f2fs_dir_entry *old_entry;
663         struct f2fs_dir_entry *new_entry;
664         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
665         int err = -ENOENT;
666
667         if ((f2fs_encrypted_inode(old_dir) &&
668                         !fscrypt_has_encryption_key(old_dir)) ||
669                         (f2fs_encrypted_inode(new_dir) &&
670                         !fscrypt_has_encryption_key(new_dir)))
671                 return -ENOKEY;
672
673         if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
674                         !fscrypt_has_permitted_context(new_dir, old_inode)) {
675                 err = -EPERM;
676                 goto out;
677         }
678
679         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
680         if (!old_entry) {
681                 if (IS_ERR(old_page))
682                         err = PTR_ERR(old_page);
683                 goto out;
684         }
685
686         if (S_ISDIR(old_inode->i_mode)) {
687                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
688                 if (!old_dir_entry) {
689                         if (IS_ERR(old_dir_page))
690                                 err = PTR_ERR(old_dir_page);
691                         goto out_old;
692                 }
693         }
694
695         if (flags & RENAME_WHITEOUT) {
696                 err = f2fs_create_whiteout(old_dir, &whiteout);
697                 if (err)
698                         goto out_dir;
699         }
700
701         if (new_inode) {
702
703                 err = -ENOTEMPTY;
704                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
705                         goto out_whiteout;
706
707                 err = -ENOENT;
708                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
709                                                 &new_page);
710                 if (!new_entry) {
711                         if (IS_ERR(new_page))
712                                 err = PTR_ERR(new_page);
713                         goto out_whiteout;
714                 }
715
716                 f2fs_balance_fs(sbi, true);
717
718                 f2fs_lock_op(sbi);
719
720                 err = acquire_orphan_inode(sbi);
721                 if (err)
722                         goto put_out_dir;
723
724                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
725
726                 new_inode->i_ctime = current_time(new_inode);
727                 down_write(&F2FS_I(new_inode)->i_sem);
728                 if (old_dir_entry)
729                         f2fs_i_links_write(new_inode, false);
730                 f2fs_i_links_write(new_inode, false);
731                 up_write(&F2FS_I(new_inode)->i_sem);
732
733                 if (!new_inode->i_nlink)
734                         add_orphan_inode(new_inode);
735                 else
736                         release_orphan_inode(sbi);
737         } else {
738                 f2fs_balance_fs(sbi, true);
739
740                 f2fs_lock_op(sbi);
741
742                 err = f2fs_add_link(new_dentry, old_inode);
743                 if (err) {
744                         f2fs_unlock_op(sbi);
745                         goto out_whiteout;
746                 }
747
748                 if (old_dir_entry)
749                         f2fs_i_links_write(new_dir, true);
750
751                 /*
752                  * old entry and new entry can locate in the same inline
753                  * dentry in inode, when attaching new entry in inline dentry,
754                  * it could force inline dentry conversion, after that,
755                  * old_entry and old_page will point to wrong address, in
756                  * order to avoid this, let's do the check and update here.
757                  */
758                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
759                         f2fs_put_page(old_page, 0);
760                         old_page = NULL;
761
762                         old_entry = f2fs_find_entry(old_dir,
763                                                 &old_dentry->d_name, &old_page);
764                         if (!old_entry) {
765                                 err = -ENOENT;
766                                 if (IS_ERR(old_page))
767                                         err = PTR_ERR(old_page);
768                                 f2fs_unlock_op(sbi);
769                                 goto out_whiteout;
770                         }
771                 }
772         }
773
774         down_write(&F2FS_I(old_inode)->i_sem);
775         file_lost_pino(old_inode);
776         up_write(&F2FS_I(old_inode)->i_sem);
777
778         old_inode->i_ctime = current_time(old_inode);
779         f2fs_mark_inode_dirty_sync(old_inode, false);
780
781         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
782
783         if (whiteout) {
784                 whiteout->i_state |= I_LINKABLE;
785                 set_inode_flag(whiteout, FI_INC_LINK);
786                 err = f2fs_add_link(old_dentry, whiteout);
787                 if (err)
788                         goto put_out_dir;
789                 whiteout->i_state &= ~I_LINKABLE;
790                 iput(whiteout);
791         }
792
793         if (old_dir_entry) {
794                 if (old_dir != new_dir && !whiteout) {
795                         f2fs_set_link(old_inode, old_dir_entry,
796                                                 old_dir_page, new_dir);
797                 } else {
798                         f2fs_dentry_kunmap(old_inode, old_dir_page);
799                         f2fs_put_page(old_dir_page, 0);
800                 }
801                 f2fs_i_links_write(old_dir, false);
802         }
803
804         f2fs_unlock_op(sbi);
805
806         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
807                 f2fs_sync_fs(sbi->sb, 1);
808         return 0;
809
810 put_out_dir:
811         f2fs_unlock_op(sbi);
812         if (new_page) {
813                 f2fs_dentry_kunmap(new_dir, new_page);
814                 f2fs_put_page(new_page, 0);
815         }
816 out_whiteout:
817         if (whiteout)
818                 iput(whiteout);
819 out_dir:
820         if (old_dir_entry) {
821                 f2fs_dentry_kunmap(old_inode, old_dir_page);
822                 f2fs_put_page(old_dir_page, 0);
823         }
824 out_old:
825         f2fs_dentry_kunmap(old_dir, old_page);
826         f2fs_put_page(old_page, 0);
827 out:
828         return err;
829 }
830
831 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
832                              struct inode *new_dir, struct dentry *new_dentry)
833 {
834         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
835         struct inode *old_inode = d_inode(old_dentry);
836         struct inode *new_inode = d_inode(new_dentry);
837         struct page *old_dir_page, *new_dir_page;
838         struct page *old_page, *new_page;
839         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
840         struct f2fs_dir_entry *old_entry, *new_entry;
841         int old_nlink = 0, new_nlink = 0;
842         int err = -ENOENT;
843
844         if ((f2fs_encrypted_inode(old_dir) &&
845                         !fscrypt_has_encryption_key(old_dir)) ||
846                         (f2fs_encrypted_inode(new_dir) &&
847                         !fscrypt_has_encryption_key(new_dir)))
848                 return -ENOKEY;
849
850         if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
851                         (old_dir != new_dir) &&
852                         (!fscrypt_has_permitted_context(new_dir, old_inode) ||
853                          !fscrypt_has_permitted_context(old_dir, new_inode)))
854                 return -EPERM;
855
856         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
857         if (!old_entry) {
858                 if (IS_ERR(old_page))
859                         err = PTR_ERR(old_page);
860                 goto out;
861         }
862
863         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
864         if (!new_entry) {
865                 if (IS_ERR(new_page))
866                         err = PTR_ERR(new_page);
867                 goto out_old;
868         }
869
870         /* prepare for updating ".." directory entry info later */
871         if (old_dir != new_dir) {
872                 if (S_ISDIR(old_inode->i_mode)) {
873                         old_dir_entry = f2fs_parent_dir(old_inode,
874                                                         &old_dir_page);
875                         if (!old_dir_entry) {
876                                 if (IS_ERR(old_dir_page))
877                                         err = PTR_ERR(old_dir_page);
878                                 goto out_new;
879                         }
880                 }
881
882                 if (S_ISDIR(new_inode->i_mode)) {
883                         new_dir_entry = f2fs_parent_dir(new_inode,
884                                                         &new_dir_page);
885                         if (!new_dir_entry) {
886                                 if (IS_ERR(new_dir_page))
887                                         err = PTR_ERR(new_dir_page);
888                                 goto out_old_dir;
889                         }
890                 }
891         }
892
893         /*
894          * If cross rename between file and directory those are not
895          * in the same directory, we will inc nlink of file's parent
896          * later, so we should check upper boundary of its nlink.
897          */
898         if ((!old_dir_entry || !new_dir_entry) &&
899                                 old_dir_entry != new_dir_entry) {
900                 old_nlink = old_dir_entry ? -1 : 1;
901                 new_nlink = -old_nlink;
902                 err = -EMLINK;
903                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
904                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
905                         goto out_new_dir;
906         }
907
908         f2fs_balance_fs(sbi, true);
909
910         f2fs_lock_op(sbi);
911
912         /* update ".." directory entry info of old dentry */
913         if (old_dir_entry)
914                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
915
916         /* update ".." directory entry info of new dentry */
917         if (new_dir_entry)
918                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
919
920         /* update directory entry info of old dir inode */
921         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
922
923         down_write(&F2FS_I(old_inode)->i_sem);
924         file_lost_pino(old_inode);
925         up_write(&F2FS_I(old_inode)->i_sem);
926
927         old_dir->i_ctime = current_time(old_dir);
928         if (old_nlink) {
929                 down_write(&F2FS_I(old_dir)->i_sem);
930                 f2fs_i_links_write(old_dir, old_nlink > 0);
931                 up_write(&F2FS_I(old_dir)->i_sem);
932         }
933         f2fs_mark_inode_dirty_sync(old_dir, false);
934
935         /* update directory entry info of new dir inode */
936         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
937
938         down_write(&F2FS_I(new_inode)->i_sem);
939         file_lost_pino(new_inode);
940         up_write(&F2FS_I(new_inode)->i_sem);
941
942         new_dir->i_ctime = current_time(new_dir);
943         if (new_nlink) {
944                 down_write(&F2FS_I(new_dir)->i_sem);
945                 f2fs_i_links_write(new_dir, new_nlink > 0);
946                 up_write(&F2FS_I(new_dir)->i_sem);
947         }
948         f2fs_mark_inode_dirty_sync(new_dir, false);
949
950         f2fs_unlock_op(sbi);
951
952         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
953                 f2fs_sync_fs(sbi->sb, 1);
954         return 0;
955 out_new_dir:
956         if (new_dir_entry) {
957                 f2fs_dentry_kunmap(new_inode, new_dir_page);
958                 f2fs_put_page(new_dir_page, 0);
959         }
960 out_old_dir:
961         if (old_dir_entry) {
962                 f2fs_dentry_kunmap(old_inode, old_dir_page);
963                 f2fs_put_page(old_dir_page, 0);
964         }
965 out_new:
966         f2fs_dentry_kunmap(new_dir, new_page);
967         f2fs_put_page(new_page, 0);
968 out_old:
969         f2fs_dentry_kunmap(old_dir, old_page);
970         f2fs_put_page(old_page, 0);
971 out:
972         return err;
973 }
974
975 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
976                         struct inode *new_dir, struct dentry *new_dentry,
977                         unsigned int flags)
978 {
979         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
980                 return -EINVAL;
981
982         if (flags & RENAME_EXCHANGE) {
983                 return f2fs_cross_rename(old_dir, old_dentry,
984                                          new_dir, new_dentry);
985         }
986         /*
987          * VFS has already handled the new dentry existence case,
988          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
989          */
990         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
991 }
992
993 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
994                                            struct inode *inode,
995                                            struct delayed_call *done)
996 {
997         struct page *cpage = NULL;
998         char *caddr, *paddr = NULL;
999         struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1000         struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1001         struct fscrypt_symlink_data *sd;
1002         u32 max_size = inode->i_sb->s_blocksize;
1003         int res;
1004
1005         if (!dentry)
1006                 return ERR_PTR(-ECHILD);
1007
1008         res = fscrypt_get_encryption_info(inode);
1009         if (res)
1010                 return ERR_PTR(res);
1011
1012         cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1013         if (IS_ERR(cpage))
1014                 return ERR_CAST(cpage);
1015         caddr = page_address(cpage);
1016
1017         /* Symlink is encrypted */
1018         sd = (struct fscrypt_symlink_data *)caddr;
1019         cstr.name = sd->encrypted_path;
1020         cstr.len = le16_to_cpu(sd->len);
1021
1022         /* this is broken symlink case */
1023         if (unlikely(cstr.len == 0)) {
1024                 res = -ENOENT;
1025                 goto errout;
1026         }
1027
1028         if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1029                 /* Symlink data on the disk is corrupted */
1030                 res = -EIO;
1031                 goto errout;
1032         }
1033         res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1034         if (res)
1035                 goto errout;
1036
1037         res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1038         if (res)
1039                 goto errout;
1040
1041         /* this is broken symlink case */
1042         if (unlikely(pstr.name[0] == 0)) {
1043                 res = -ENOENT;
1044                 goto errout;
1045         }
1046
1047         paddr = pstr.name;
1048
1049         /* Null-terminate the name */
1050         paddr[pstr.len] = '\0';
1051
1052         put_page(cpage);
1053         set_delayed_call(done, kfree_link, paddr);
1054         return paddr;
1055 errout:
1056         fscrypt_fname_free_buffer(&pstr);
1057         put_page(cpage);
1058         return ERR_PTR(res);
1059 }
1060
1061 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1062         .get_link       = f2fs_encrypted_get_link,
1063         .getattr        = f2fs_getattr,
1064         .setattr        = f2fs_setattr,
1065 #ifdef CONFIG_F2FS_FS_XATTR
1066         .listxattr      = f2fs_listxattr,
1067 #endif
1068 };
1069
1070 const struct inode_operations f2fs_dir_inode_operations = {
1071         .create         = f2fs_create,
1072         .lookup         = f2fs_lookup,
1073         .link           = f2fs_link,
1074         .unlink         = f2fs_unlink,
1075         .symlink        = f2fs_symlink,
1076         .mkdir          = f2fs_mkdir,
1077         .rmdir          = f2fs_rmdir,
1078         .mknod          = f2fs_mknod,
1079         .rename         = f2fs_rename2,
1080         .tmpfile        = f2fs_tmpfile,
1081         .getattr        = f2fs_getattr,
1082         .setattr        = f2fs_setattr,
1083         .get_acl        = f2fs_get_acl,
1084         .set_acl        = f2fs_set_acl,
1085 #ifdef CONFIG_F2FS_FS_XATTR
1086         .listxattr      = f2fs_listxattr,
1087 #endif
1088 };
1089
1090 const struct inode_operations f2fs_symlink_inode_operations = {
1091         .get_link       = f2fs_get_link,
1092         .getattr        = f2fs_getattr,
1093         .setattr        = f2fs_setattr,
1094 #ifdef CONFIG_F2FS_FS_XATTR
1095         .listxattr      = f2fs_listxattr,
1096 #endif
1097 };
1098
1099 const struct inode_operations f2fs_special_inode_operations = {
1100         .getattr        = f2fs_getattr,
1101         .setattr        = f2fs_setattr,
1102         .get_acl        = f2fs_get_acl,
1103         .set_acl        = f2fs_set_acl,
1104 #ifdef CONFIG_F2FS_FS_XATTR
1105         .listxattr      = f2fs_listxattr,
1106 #endif
1107 };