do d_instantiate/unlock_new_inode combinations safely
[muen/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 #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 xattr_size = 0;
33         int err;
34
35         inode = new_inode(dir->i_sb);
36         if (!inode)
37                 return ERR_PTR(-ENOMEM);
38
39         f2fs_lock_op(sbi);
40         if (!alloc_nid(sbi, &ino)) {
41                 f2fs_unlock_op(sbi);
42                 err = -ENOSPC;
43                 goto fail;
44         }
45         f2fs_unlock_op(sbi);
46
47         nid_free = true;
48
49         inode_init_owner(inode, dir, mode);
50
51         inode->i_ino = ino;
52         inode->i_blocks = 0;
53         inode->i_mtime = inode->i_atime = inode->i_ctime =
54                         F2FS_I(inode)->i_crtime = current_time(inode);
55         inode->i_generation = sbi->s_next_generation++;
56
57         err = insert_inode_locked(inode);
58         if (err) {
59                 err = -EINVAL;
60                 goto fail;
61         }
62
63         if (f2fs_sb_has_project_quota(sbi->sb) &&
64                 (F2FS_I(dir)->i_flags & FS_PROJINHERIT_FL))
65                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
66         else
67                 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
68                                                         F2FS_DEF_PROJID);
69
70         err = dquot_initialize(inode);
71         if (err)
72                 goto fail_drop;
73
74         err = dquot_alloc_inode(inode);
75         if (err)
76                 goto fail_drop;
77
78         set_inode_flag(inode, FI_NEW_INODE);
79
80         /* If the directory encrypted, then we should encrypt the inode. */
81         if ((f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
82                                 f2fs_may_encrypt(inode))
83                 f2fs_set_encrypted_inode(inode);
84
85         if (f2fs_sb_has_extra_attr(sbi->sb)) {
86                 set_inode_flag(inode, FI_EXTRA_ATTR);
87                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
88         }
89
90         if (test_opt(sbi, INLINE_XATTR))
91                 set_inode_flag(inode, FI_INLINE_XATTR);
92
93         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
94                 set_inode_flag(inode, FI_INLINE_DATA);
95         if (f2fs_may_inline_dentry(inode))
96                 set_inode_flag(inode, FI_INLINE_DENTRY);
97
98         if (f2fs_sb_has_flexible_inline_xattr(sbi->sb)) {
99                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
100                 if (f2fs_has_inline_xattr(inode))
101                         xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
102                 /* Otherwise, will be 0 */
103         } else if (f2fs_has_inline_xattr(inode) ||
104                                 f2fs_has_inline_dentry(inode)) {
105                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
106         }
107         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
108
109         f2fs_init_extent_tree(inode, NULL);
110
111         stat_inc_inline_xattr(inode);
112         stat_inc_inline_inode(inode);
113         stat_inc_inline_dir(inode);
114
115         F2FS_I(inode)->i_flags =
116                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
117
118         if (S_ISDIR(inode->i_mode))
119                 F2FS_I(inode)->i_flags |= FS_INDEX_FL;
120
121         if (F2FS_I(inode)->i_flags & FS_PROJINHERIT_FL)
122                 set_inode_flag(inode, FI_PROJ_INHERIT);
123
124         trace_f2fs_new_inode(inode, 0);
125         return inode;
126
127 fail:
128         trace_f2fs_new_inode(inode, err);
129         make_bad_inode(inode);
130         if (nid_free)
131                 set_inode_flag(inode, FI_FREE_NID);
132         iput(inode);
133         return ERR_PTR(err);
134 fail_drop:
135         trace_f2fs_new_inode(inode, err);
136         dquot_drop(inode);
137         inode->i_flags |= S_NOQUOTA;
138         if (nid_free)
139                 set_inode_flag(inode, FI_FREE_NID);
140         clear_nlink(inode);
141         unlock_new_inode(inode);
142         iput(inode);
143         return ERR_PTR(err);
144 }
145
146 static int is_extension_exist(const unsigned char *s, const char *sub)
147 {
148         size_t slen = strlen(s);
149         size_t sublen = strlen(sub);
150         int i;
151
152         /*
153          * filename format of multimedia file should be defined as:
154          * "filename + '.' + extension + (optional: '.' + temp extension)".
155          */
156         if (slen < sublen + 2)
157                 return 0;
158
159         for (i = 1; i < slen - sublen; i++) {
160                 if (s[i] != '.')
161                         continue;
162                 if (!strncasecmp(s + i + 1, sub, sublen))
163                         return 1;
164         }
165
166         return 0;
167 }
168
169 /*
170  * Set multimedia files as cold files for hot/cold data separation
171  */
172 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
173                 const unsigned char *name)
174 {
175         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
176         int i, cold_count, hot_count;
177
178         down_read(&sbi->sb_lock);
179
180         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
181         hot_count = sbi->raw_super->hot_ext_count;
182
183         for (i = 0; i < cold_count + hot_count; i++) {
184                 if (!is_extension_exist(name, extlist[i]))
185                         continue;
186                 if (i < cold_count)
187                         file_set_cold(inode);
188                 else
189                         file_set_hot(inode);
190                 break;
191         }
192
193         up_read(&sbi->sb_lock);
194 }
195
196 int update_extension_list(struct f2fs_sb_info *sbi, const char *name,
197                                                         bool hot, bool set)
198 {
199         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
200         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
201         int hot_count = sbi->raw_super->hot_ext_count;
202         int total_count = cold_count + hot_count;
203         int start, count;
204         int i;
205
206         if (set) {
207                 if (total_count == F2FS_MAX_EXTENSION)
208                         return -EINVAL;
209         } else {
210                 if (!hot && !cold_count)
211                         return -EINVAL;
212                 if (hot && !hot_count)
213                         return -EINVAL;
214         }
215
216         if (hot) {
217                 start = cold_count;
218                 count = total_count;
219         } else {
220                 start = 0;
221                 count = cold_count;
222         }
223
224         for (i = start; i < count; i++) {
225                 if (strcmp(name, extlist[i]))
226                         continue;
227
228                 if (set)
229                         return -EINVAL;
230
231                 memcpy(extlist[i], extlist[i + 1],
232                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
233                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
234                 if (hot)
235                         sbi->raw_super->hot_ext_count = hot_count - 1;
236                 else
237                         sbi->raw_super->extension_count =
238                                                 cpu_to_le32(cold_count - 1);
239                 return 0;
240         }
241
242         if (!set)
243                 return -EINVAL;
244
245         if (hot) {
246                 strncpy(extlist[count], name, strlen(name));
247                 sbi->raw_super->hot_ext_count = hot_count + 1;
248         } else {
249                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
250
251                 memcpy(buf, &extlist[cold_count],
252                                 F2FS_EXTENSION_LEN * hot_count);
253                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
254                 strncpy(extlist[cold_count], name, strlen(name));
255                 memcpy(&extlist[cold_count + 1], buf,
256                                 F2FS_EXTENSION_LEN * hot_count);
257                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
258         }
259         return 0;
260 }
261
262 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
263                                                 bool excl)
264 {
265         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
266         struct inode *inode;
267         nid_t ino = 0;
268         int err;
269
270         if (unlikely(f2fs_cp_error(sbi)))
271                 return -EIO;
272
273         err = dquot_initialize(dir);
274         if (err)
275                 return err;
276
277         inode = f2fs_new_inode(dir, mode);
278         if (IS_ERR(inode))
279                 return PTR_ERR(inode);
280
281         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
282                 set_file_temperature(sbi, inode, dentry->d_name.name);
283
284         inode->i_op = &f2fs_file_inode_operations;
285         inode->i_fop = &f2fs_file_operations;
286         inode->i_mapping->a_ops = &f2fs_dblock_aops;
287         ino = inode->i_ino;
288
289         f2fs_lock_op(sbi);
290         err = f2fs_add_link(dentry, inode);
291         if (err)
292                 goto out;
293         f2fs_unlock_op(sbi);
294
295         alloc_nid_done(sbi, ino);
296
297         d_instantiate_new(dentry, inode);
298
299         if (IS_DIRSYNC(dir))
300                 f2fs_sync_fs(sbi->sb, 1);
301
302         f2fs_balance_fs(sbi, true);
303         return 0;
304 out:
305         handle_failed_inode(inode);
306         return err;
307 }
308
309 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
310                 struct dentry *dentry)
311 {
312         struct inode *inode = d_inode(old_dentry);
313         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
314         int err;
315
316         if (unlikely(f2fs_cp_error(sbi)))
317                 return -EIO;
318
319         err = fscrypt_prepare_link(old_dentry, dir, dentry);
320         if (err)
321                 return err;
322
323         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
324                         (!projid_eq(F2FS_I(dir)->i_projid,
325                         F2FS_I(old_dentry->d_inode)->i_projid)))
326                 return -EXDEV;
327
328         err = dquot_initialize(dir);
329         if (err)
330                 return err;
331
332         f2fs_balance_fs(sbi, true);
333
334         inode->i_ctime = current_time(inode);
335         ihold(inode);
336
337         set_inode_flag(inode, FI_INC_LINK);
338         f2fs_lock_op(sbi);
339         err = f2fs_add_link(dentry, inode);
340         if (err)
341                 goto out;
342         f2fs_unlock_op(sbi);
343
344         d_instantiate(dentry, inode);
345
346         if (IS_DIRSYNC(dir))
347                 f2fs_sync_fs(sbi->sb, 1);
348         return 0;
349 out:
350         clear_inode_flag(inode, FI_INC_LINK);
351         iput(inode);
352         f2fs_unlock_op(sbi);
353         return err;
354 }
355
356 struct dentry *f2fs_get_parent(struct dentry *child)
357 {
358         struct qstr dotdot = QSTR_INIT("..", 2);
359         struct page *page;
360         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
361         if (!ino) {
362                 if (IS_ERR(page))
363                         return ERR_CAST(page);
364                 return ERR_PTR(-ENOENT);
365         }
366         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
367 }
368
369 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
370 {
371         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
372         struct qstr dot = QSTR_INIT(".", 1);
373         struct qstr dotdot = QSTR_INIT("..", 2);
374         struct f2fs_dir_entry *de;
375         struct page *page;
376         int err = 0;
377
378         if (f2fs_readonly(sbi->sb)) {
379                 f2fs_msg(sbi->sb, KERN_INFO,
380                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
381                         "in readonly mountpoint", dir->i_ino, pino);
382                 return 0;
383         }
384
385         err = dquot_initialize(dir);
386         if (err)
387                 return err;
388
389         f2fs_balance_fs(sbi, true);
390
391         f2fs_lock_op(sbi);
392
393         de = f2fs_find_entry(dir, &dot, &page);
394         if (de) {
395                 f2fs_put_page(page, 0);
396         } else if (IS_ERR(page)) {
397                 err = PTR_ERR(page);
398                 goto out;
399         } else {
400                 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
401                 if (err)
402                         goto out;
403         }
404
405         de = f2fs_find_entry(dir, &dotdot, &page);
406         if (de)
407                 f2fs_put_page(page, 0);
408         else if (IS_ERR(page))
409                 err = PTR_ERR(page);
410         else
411                 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
412 out:
413         if (!err)
414                 clear_inode_flag(dir, FI_INLINE_DOTS);
415
416         f2fs_unlock_op(sbi);
417         return err;
418 }
419
420 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
421                 unsigned int flags)
422 {
423         struct inode *inode = NULL;
424         struct f2fs_dir_entry *de;
425         struct page *page;
426         struct dentry *new;
427         nid_t ino = -1;
428         int err = 0;
429         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
430
431         trace_f2fs_lookup_start(dir, dentry, flags);
432
433         err = fscrypt_prepare_lookup(dir, dentry, flags);
434         if (err)
435                 goto out;
436
437         if (dentry->d_name.len > F2FS_NAME_LEN) {
438                 err = -ENAMETOOLONG;
439                 goto out;
440         }
441
442         de = f2fs_find_entry(dir, &dentry->d_name, &page);
443         if (!de) {
444                 if (IS_ERR(page)) {
445                         err = PTR_ERR(page);
446                         goto out;
447                 }
448                 goto out_splice;
449         }
450
451         ino = le32_to_cpu(de->ino);
452         f2fs_put_page(page, 0);
453
454         inode = f2fs_iget(dir->i_sb, ino);
455         if (IS_ERR(inode)) {
456                 err = PTR_ERR(inode);
457                 goto out;
458         }
459
460         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
461                 err = __recover_dot_dentries(dir, root_ino);
462                 if (err)
463                         goto out_iput;
464         }
465
466         if (f2fs_has_inline_dots(inode)) {
467                 err = __recover_dot_dentries(inode, dir->i_ino);
468                 if (err)
469                         goto out_iput;
470         }
471         if (f2fs_encrypted_inode(dir) &&
472             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
473             !fscrypt_has_permitted_context(dir, inode)) {
474                 f2fs_msg(inode->i_sb, KERN_WARNING,
475                          "Inconsistent encryption contexts: %lu/%lu",
476                          dir->i_ino, inode->i_ino);
477                 err = -EPERM;
478                 goto out_iput;
479         }
480 out_splice:
481         new = d_splice_alias(inode, dentry);
482         if (IS_ERR(new))
483                 err = PTR_ERR(new);
484         trace_f2fs_lookup_end(dir, dentry, ino, err);
485         return new;
486 out_iput:
487         iput(inode);
488 out:
489         trace_f2fs_lookup_end(dir, dentry, ino, err);
490         return ERR_PTR(err);
491 }
492
493 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
494 {
495         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
496         struct inode *inode = d_inode(dentry);
497         struct f2fs_dir_entry *de;
498         struct page *page;
499         int err = -ENOENT;
500
501         trace_f2fs_unlink_enter(dir, dentry);
502
503         if (unlikely(f2fs_cp_error(sbi)))
504                 return -EIO;
505
506         err = dquot_initialize(dir);
507         if (err)
508                 return err;
509         err = dquot_initialize(inode);
510         if (err)
511                 return err;
512
513         de = f2fs_find_entry(dir, &dentry->d_name, &page);
514         if (!de) {
515                 if (IS_ERR(page))
516                         err = PTR_ERR(page);
517                 goto fail;
518         }
519
520         f2fs_balance_fs(sbi, true);
521
522         f2fs_lock_op(sbi);
523         err = acquire_orphan_inode(sbi);
524         if (err) {
525                 f2fs_unlock_op(sbi);
526                 f2fs_put_page(page, 0);
527                 goto fail;
528         }
529         f2fs_delete_entry(de, page, dir, inode);
530         f2fs_unlock_op(sbi);
531
532         if (IS_DIRSYNC(dir))
533                 f2fs_sync_fs(sbi->sb, 1);
534 fail:
535         trace_f2fs_unlink_exit(inode, err);
536         return err;
537 }
538
539 static const char *f2fs_get_link(struct dentry *dentry,
540                                  struct inode *inode,
541                                  struct delayed_call *done)
542 {
543         const char *link = page_get_link(dentry, inode, done);
544         if (!IS_ERR(link) && !*link) {
545                 /* this is broken symlink case */
546                 do_delayed_call(done);
547                 clear_delayed_call(done);
548                 link = ERR_PTR(-ENOENT);
549         }
550         return link;
551 }
552
553 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
554                                         const char *symname)
555 {
556         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
557         struct inode *inode;
558         size_t len = strlen(symname);
559         struct fscrypt_str disk_link;
560         int err;
561
562         if (unlikely(f2fs_cp_error(sbi)))
563                 return -EIO;
564
565         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
566                                       &disk_link);
567         if (err)
568                 return err;
569
570         err = dquot_initialize(dir);
571         if (err)
572                 return err;
573
574         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
575         if (IS_ERR(inode))
576                 return PTR_ERR(inode);
577
578         if (IS_ENCRYPTED(inode))
579                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
580         else
581                 inode->i_op = &f2fs_symlink_inode_operations;
582         inode_nohighmem(inode);
583         inode->i_mapping->a_ops = &f2fs_dblock_aops;
584
585         f2fs_lock_op(sbi);
586         err = f2fs_add_link(dentry, inode);
587         if (err)
588                 goto out_handle_failed_inode;
589         f2fs_unlock_op(sbi);
590         alloc_nid_done(sbi, inode->i_ino);
591
592         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
593         if (err)
594                 goto err_out;
595
596         err = page_symlink(inode, disk_link.name, disk_link.len);
597
598 err_out:
599         d_instantiate_new(dentry, inode);
600
601         /*
602          * Let's flush symlink data in order to avoid broken symlink as much as
603          * possible. Nevertheless, fsyncing is the best way, but there is no
604          * way to get a file descriptor in order to flush that.
605          *
606          * Note that, it needs to do dir->fsync to make this recoverable.
607          * If the symlink path is stored into inline_data, there is no
608          * performance regression.
609          */
610         if (!err) {
611                 filemap_write_and_wait_range(inode->i_mapping, 0,
612                                                         disk_link.len - 1);
613
614                 if (IS_DIRSYNC(dir))
615                         f2fs_sync_fs(sbi->sb, 1);
616         } else {
617                 f2fs_unlink(dir, dentry);
618         }
619
620         f2fs_balance_fs(sbi, true);
621         goto out_free_encrypted_link;
622
623 out_handle_failed_inode:
624         handle_failed_inode(inode);
625 out_free_encrypted_link:
626         if (disk_link.name != (unsigned char *)symname)
627                 kfree(disk_link.name);
628         return err;
629 }
630
631 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
632 {
633         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
634         struct inode *inode;
635         int err;
636
637         if (unlikely(f2fs_cp_error(sbi)))
638                 return -EIO;
639
640         err = dquot_initialize(dir);
641         if (err)
642                 return err;
643
644         inode = f2fs_new_inode(dir, S_IFDIR | mode);
645         if (IS_ERR(inode))
646                 return PTR_ERR(inode);
647
648         inode->i_op = &f2fs_dir_inode_operations;
649         inode->i_fop = &f2fs_dir_operations;
650         inode->i_mapping->a_ops = &f2fs_dblock_aops;
651         inode_nohighmem(inode);
652
653         set_inode_flag(inode, FI_INC_LINK);
654         f2fs_lock_op(sbi);
655         err = f2fs_add_link(dentry, inode);
656         if (err)
657                 goto out_fail;
658         f2fs_unlock_op(sbi);
659
660         alloc_nid_done(sbi, inode->i_ino);
661
662         d_instantiate_new(dentry, inode);
663
664         if (IS_DIRSYNC(dir))
665                 f2fs_sync_fs(sbi->sb, 1);
666
667         f2fs_balance_fs(sbi, true);
668         return 0;
669
670 out_fail:
671         clear_inode_flag(inode, FI_INC_LINK);
672         handle_failed_inode(inode);
673         return err;
674 }
675
676 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
677 {
678         struct inode *inode = d_inode(dentry);
679         if (f2fs_empty_dir(inode))
680                 return f2fs_unlink(dir, dentry);
681         return -ENOTEMPTY;
682 }
683
684 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
685                                 umode_t mode, dev_t rdev)
686 {
687         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
688         struct inode *inode;
689         int err = 0;
690
691         if (unlikely(f2fs_cp_error(sbi)))
692                 return -EIO;
693
694         err = dquot_initialize(dir);
695         if (err)
696                 return err;
697
698         inode = f2fs_new_inode(dir, mode);
699         if (IS_ERR(inode))
700                 return PTR_ERR(inode);
701
702         init_special_inode(inode, inode->i_mode, rdev);
703         inode->i_op = &f2fs_special_inode_operations;
704
705         f2fs_lock_op(sbi);
706         err = f2fs_add_link(dentry, inode);
707         if (err)
708                 goto out;
709         f2fs_unlock_op(sbi);
710
711         alloc_nid_done(sbi, inode->i_ino);
712
713         d_instantiate_new(dentry, inode);
714
715         if (IS_DIRSYNC(dir))
716                 f2fs_sync_fs(sbi->sb, 1);
717
718         f2fs_balance_fs(sbi, true);
719         return 0;
720 out:
721         handle_failed_inode(inode);
722         return err;
723 }
724
725 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
726                                         umode_t mode, struct inode **whiteout)
727 {
728         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
729         struct inode *inode;
730         int err;
731
732         err = dquot_initialize(dir);
733         if (err)
734                 return err;
735
736         inode = f2fs_new_inode(dir, mode);
737         if (IS_ERR(inode))
738                 return PTR_ERR(inode);
739
740         if (whiteout) {
741                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
742                 inode->i_op = &f2fs_special_inode_operations;
743         } else {
744                 inode->i_op = &f2fs_file_inode_operations;
745                 inode->i_fop = &f2fs_file_operations;
746                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
747         }
748
749         f2fs_lock_op(sbi);
750         err = acquire_orphan_inode(sbi);
751         if (err)
752                 goto out;
753
754         err = f2fs_do_tmpfile(inode, dir);
755         if (err)
756                 goto release_out;
757
758         /*
759          * add this non-linked tmpfile to orphan list, in this way we could
760          * remove all unused data of tmpfile after abnormal power-off.
761          */
762         add_orphan_inode(inode);
763         alloc_nid_done(sbi, inode->i_ino);
764
765         if (whiteout) {
766                 f2fs_i_links_write(inode, false);
767                 *whiteout = inode;
768         } else {
769                 d_tmpfile(dentry, inode);
770         }
771         /* link_count was changed by d_tmpfile as well. */
772         f2fs_unlock_op(sbi);
773         unlock_new_inode(inode);
774
775         f2fs_balance_fs(sbi, true);
776         return 0;
777
778 release_out:
779         release_orphan_inode(sbi);
780 out:
781         handle_failed_inode(inode);
782         return err;
783 }
784
785 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
786 {
787         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
788
789         if (unlikely(f2fs_cp_error(sbi)))
790                 return -EIO;
791
792         if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
793                 int err = fscrypt_get_encryption_info(dir);
794                 if (err)
795                         return err;
796         }
797
798         return __f2fs_tmpfile(dir, dentry, mode, NULL);
799 }
800
801 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
802 {
803         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
804                 return -EIO;
805
806         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
807 }
808
809 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
810                         struct inode *new_dir, struct dentry *new_dentry,
811                         unsigned int flags)
812 {
813         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
814         struct inode *old_inode = d_inode(old_dentry);
815         struct inode *new_inode = d_inode(new_dentry);
816         struct inode *whiteout = NULL;
817         struct page *old_dir_page;
818         struct page *old_page, *new_page = NULL;
819         struct f2fs_dir_entry *old_dir_entry = NULL;
820         struct f2fs_dir_entry *old_entry;
821         struct f2fs_dir_entry *new_entry;
822         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
823         int err = -ENOENT;
824
825         if (unlikely(f2fs_cp_error(sbi)))
826                 return -EIO;
827
828         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
829                         (!projid_eq(F2FS_I(new_dir)->i_projid,
830                         F2FS_I(old_dentry->d_inode)->i_projid)))
831                 return -EXDEV;
832
833         err = dquot_initialize(old_dir);
834         if (err)
835                 goto out;
836
837         err = dquot_initialize(new_dir);
838         if (err)
839                 goto out;
840
841         if (new_inode) {
842                 err = dquot_initialize(new_inode);
843                 if (err)
844                         goto out;
845         }
846
847         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
848         if (!old_entry) {
849                 if (IS_ERR(old_page))
850                         err = PTR_ERR(old_page);
851                 goto out;
852         }
853
854         if (S_ISDIR(old_inode->i_mode)) {
855                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
856                 if (!old_dir_entry) {
857                         if (IS_ERR(old_dir_page))
858                                 err = PTR_ERR(old_dir_page);
859                         goto out_old;
860                 }
861         }
862
863         if (flags & RENAME_WHITEOUT) {
864                 err = f2fs_create_whiteout(old_dir, &whiteout);
865                 if (err)
866                         goto out_dir;
867         }
868
869         if (new_inode) {
870
871                 err = -ENOTEMPTY;
872                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
873                         goto out_whiteout;
874
875                 err = -ENOENT;
876                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
877                                                 &new_page);
878                 if (!new_entry) {
879                         if (IS_ERR(new_page))
880                                 err = PTR_ERR(new_page);
881                         goto out_whiteout;
882                 }
883
884                 f2fs_balance_fs(sbi, true);
885
886                 f2fs_lock_op(sbi);
887
888                 err = acquire_orphan_inode(sbi);
889                 if (err)
890                         goto put_out_dir;
891
892                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
893
894                 new_inode->i_ctime = current_time(new_inode);
895                 down_write(&F2FS_I(new_inode)->i_sem);
896                 if (old_dir_entry)
897                         f2fs_i_links_write(new_inode, false);
898                 f2fs_i_links_write(new_inode, false);
899                 up_write(&F2FS_I(new_inode)->i_sem);
900
901                 if (!new_inode->i_nlink)
902                         add_orphan_inode(new_inode);
903                 else
904                         release_orphan_inode(sbi);
905         } else {
906                 f2fs_balance_fs(sbi, true);
907
908                 f2fs_lock_op(sbi);
909
910                 err = f2fs_add_link(new_dentry, old_inode);
911                 if (err) {
912                         f2fs_unlock_op(sbi);
913                         goto out_whiteout;
914                 }
915
916                 if (old_dir_entry)
917                         f2fs_i_links_write(new_dir, true);
918
919                 /*
920                  * old entry and new entry can locate in the same inline
921                  * dentry in inode, when attaching new entry in inline dentry,
922                  * it could force inline dentry conversion, after that,
923                  * old_entry and old_page will point to wrong address, in
924                  * order to avoid this, let's do the check and update here.
925                  */
926                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
927                         f2fs_put_page(old_page, 0);
928                         old_page = NULL;
929
930                         old_entry = f2fs_find_entry(old_dir,
931                                                 &old_dentry->d_name, &old_page);
932                         if (!old_entry) {
933                                 err = -ENOENT;
934                                 if (IS_ERR(old_page))
935                                         err = PTR_ERR(old_page);
936                                 f2fs_unlock_op(sbi);
937                                 goto out_whiteout;
938                         }
939                 }
940         }
941
942         down_write(&F2FS_I(old_inode)->i_sem);
943         if (!old_dir_entry || whiteout)
944                 file_lost_pino(old_inode);
945         else
946                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
947         up_write(&F2FS_I(old_inode)->i_sem);
948
949         old_inode->i_ctime = current_time(old_inode);
950         f2fs_mark_inode_dirty_sync(old_inode, false);
951
952         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
953
954         if (whiteout) {
955                 whiteout->i_state |= I_LINKABLE;
956                 set_inode_flag(whiteout, FI_INC_LINK);
957                 err = f2fs_add_link(old_dentry, whiteout);
958                 if (err)
959                         goto put_out_dir;
960                 whiteout->i_state &= ~I_LINKABLE;
961                 iput(whiteout);
962         }
963
964         if (old_dir_entry) {
965                 if (old_dir != new_dir && !whiteout)
966                         f2fs_set_link(old_inode, old_dir_entry,
967                                                 old_dir_page, new_dir);
968                 else
969                         f2fs_put_page(old_dir_page, 0);
970                 f2fs_i_links_write(old_dir, false);
971         }
972         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
973                 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
974
975         f2fs_unlock_op(sbi);
976
977         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
978                 f2fs_sync_fs(sbi->sb, 1);
979         return 0;
980
981 put_out_dir:
982         f2fs_unlock_op(sbi);
983         if (new_page)
984                 f2fs_put_page(new_page, 0);
985 out_whiteout:
986         if (whiteout)
987                 iput(whiteout);
988 out_dir:
989         if (old_dir_entry)
990                 f2fs_put_page(old_dir_page, 0);
991 out_old:
992         f2fs_put_page(old_page, 0);
993 out:
994         return err;
995 }
996
997 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
998                              struct inode *new_dir, struct dentry *new_dentry)
999 {
1000         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1001         struct inode *old_inode = d_inode(old_dentry);
1002         struct inode *new_inode = d_inode(new_dentry);
1003         struct page *old_dir_page, *new_dir_page;
1004         struct page *old_page, *new_page;
1005         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1006         struct f2fs_dir_entry *old_entry, *new_entry;
1007         int old_nlink = 0, new_nlink = 0;
1008         int err = -ENOENT;
1009
1010         if (unlikely(f2fs_cp_error(sbi)))
1011                 return -EIO;
1012
1013         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1014                         !projid_eq(F2FS_I(new_dir)->i_projid,
1015                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1016             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1017                         !projid_eq(F2FS_I(old_dir)->i_projid,
1018                         F2FS_I(new_dentry->d_inode)->i_projid)))
1019                 return -EXDEV;
1020
1021         err = dquot_initialize(old_dir);
1022         if (err)
1023                 goto out;
1024
1025         err = dquot_initialize(new_dir);
1026         if (err)
1027                 goto out;
1028
1029         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1030         if (!old_entry) {
1031                 if (IS_ERR(old_page))
1032                         err = PTR_ERR(old_page);
1033                 goto out;
1034         }
1035
1036         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1037         if (!new_entry) {
1038                 if (IS_ERR(new_page))
1039                         err = PTR_ERR(new_page);
1040                 goto out_old;
1041         }
1042
1043         /* prepare for updating ".." directory entry info later */
1044         if (old_dir != new_dir) {
1045                 if (S_ISDIR(old_inode->i_mode)) {
1046                         old_dir_entry = f2fs_parent_dir(old_inode,
1047                                                         &old_dir_page);
1048                         if (!old_dir_entry) {
1049                                 if (IS_ERR(old_dir_page))
1050                                         err = PTR_ERR(old_dir_page);
1051                                 goto out_new;
1052                         }
1053                 }
1054
1055                 if (S_ISDIR(new_inode->i_mode)) {
1056                         new_dir_entry = f2fs_parent_dir(new_inode,
1057                                                         &new_dir_page);
1058                         if (!new_dir_entry) {
1059                                 if (IS_ERR(new_dir_page))
1060                                         err = PTR_ERR(new_dir_page);
1061                                 goto out_old_dir;
1062                         }
1063                 }
1064         }
1065
1066         /*
1067          * If cross rename between file and directory those are not
1068          * in the same directory, we will inc nlink of file's parent
1069          * later, so we should check upper boundary of its nlink.
1070          */
1071         if ((!old_dir_entry || !new_dir_entry) &&
1072                                 old_dir_entry != new_dir_entry) {
1073                 old_nlink = old_dir_entry ? -1 : 1;
1074                 new_nlink = -old_nlink;
1075                 err = -EMLINK;
1076                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1077                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1078                         goto out_new_dir;
1079         }
1080
1081         f2fs_balance_fs(sbi, true);
1082
1083         f2fs_lock_op(sbi);
1084
1085         /* update ".." directory entry info of old dentry */
1086         if (old_dir_entry)
1087                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1088
1089         /* update ".." directory entry info of new dentry */
1090         if (new_dir_entry)
1091                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1092
1093         /* update directory entry info of old dir inode */
1094         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1095
1096         down_write(&F2FS_I(old_inode)->i_sem);
1097         file_lost_pino(old_inode);
1098         up_write(&F2FS_I(old_inode)->i_sem);
1099
1100         old_dir->i_ctime = current_time(old_dir);
1101         if (old_nlink) {
1102                 down_write(&F2FS_I(old_dir)->i_sem);
1103                 f2fs_i_links_write(old_dir, old_nlink > 0);
1104                 up_write(&F2FS_I(old_dir)->i_sem);
1105         }
1106         f2fs_mark_inode_dirty_sync(old_dir, false);
1107
1108         /* update directory entry info of new dir inode */
1109         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1110
1111         down_write(&F2FS_I(new_inode)->i_sem);
1112         file_lost_pino(new_inode);
1113         up_write(&F2FS_I(new_inode)->i_sem);
1114
1115         new_dir->i_ctime = current_time(new_dir);
1116         if (new_nlink) {
1117                 down_write(&F2FS_I(new_dir)->i_sem);
1118                 f2fs_i_links_write(new_dir, new_nlink > 0);
1119                 up_write(&F2FS_I(new_dir)->i_sem);
1120         }
1121         f2fs_mark_inode_dirty_sync(new_dir, false);
1122
1123         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1124                 add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1125                 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1126         }
1127
1128         f2fs_unlock_op(sbi);
1129
1130         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1131                 f2fs_sync_fs(sbi->sb, 1);
1132         return 0;
1133 out_new_dir:
1134         if (new_dir_entry) {
1135                 f2fs_put_page(new_dir_page, 0);
1136         }
1137 out_old_dir:
1138         if (old_dir_entry) {
1139                 f2fs_put_page(old_dir_page, 0);
1140         }
1141 out_new:
1142         f2fs_put_page(new_page, 0);
1143 out_old:
1144         f2fs_put_page(old_page, 0);
1145 out:
1146         return err;
1147 }
1148
1149 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1150                         struct inode *new_dir, struct dentry *new_dentry,
1151                         unsigned int flags)
1152 {
1153         int err;
1154
1155         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1156                 return -EINVAL;
1157
1158         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1159                                      flags);
1160         if (err)
1161                 return err;
1162
1163         if (flags & RENAME_EXCHANGE) {
1164                 return f2fs_cross_rename(old_dir, old_dentry,
1165                                          new_dir, new_dentry);
1166         }
1167         /*
1168          * VFS has already handled the new dentry existence case,
1169          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1170          */
1171         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1172 }
1173
1174 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1175                                            struct inode *inode,
1176                                            struct delayed_call *done)
1177 {
1178         struct page *page;
1179         const char *target;
1180
1181         if (!dentry)
1182                 return ERR_PTR(-ECHILD);
1183
1184         page = read_mapping_page(inode->i_mapping, 0, NULL);
1185         if (IS_ERR(page))
1186                 return ERR_CAST(page);
1187
1188         target = fscrypt_get_symlink(inode, page_address(page),
1189                                      inode->i_sb->s_blocksize, done);
1190         put_page(page);
1191         return target;
1192 }
1193
1194 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1195         .get_link       = f2fs_encrypted_get_link,
1196         .getattr        = f2fs_getattr,
1197         .setattr        = f2fs_setattr,
1198 #ifdef CONFIG_F2FS_FS_XATTR
1199         .listxattr      = f2fs_listxattr,
1200 #endif
1201 };
1202
1203 const struct inode_operations f2fs_dir_inode_operations = {
1204         .create         = f2fs_create,
1205         .lookup         = f2fs_lookup,
1206         .link           = f2fs_link,
1207         .unlink         = f2fs_unlink,
1208         .symlink        = f2fs_symlink,
1209         .mkdir          = f2fs_mkdir,
1210         .rmdir          = f2fs_rmdir,
1211         .mknod          = f2fs_mknod,
1212         .rename         = f2fs_rename2,
1213         .tmpfile        = f2fs_tmpfile,
1214         .getattr        = f2fs_getattr,
1215         .setattr        = f2fs_setattr,
1216         .get_acl        = f2fs_get_acl,
1217         .set_acl        = f2fs_set_acl,
1218 #ifdef CONFIG_F2FS_FS_XATTR
1219         .listxattr      = f2fs_listxattr,
1220 #endif
1221 };
1222
1223 const struct inode_operations f2fs_symlink_inode_operations = {
1224         .get_link       = f2fs_get_link,
1225         .getattr        = f2fs_getattr,
1226         .setattr        = f2fs_setattr,
1227 #ifdef CONFIG_F2FS_FS_XATTR
1228         .listxattr      = f2fs_listxattr,
1229 #endif
1230 };
1231
1232 const struct inode_operations f2fs_special_inode_operations = {
1233         .getattr        = f2fs_getattr,
1234         .setattr        = f2fs_setattr,
1235         .get_acl        = f2fs_get_acl,
1236         .set_acl        = f2fs_set_acl,
1237 #ifdef CONFIG_F2FS_FS_XATTR
1238         .listxattr      = f2fs_listxattr,
1239 #endif
1240 };