f2fs: give random value to i_generation
[sfrench/cifs-2.6.git] / fs / f2fs / namei.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * fs/f2fs/namei.c
4  *
5  * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6  *             http://www.samsung.com/
7  */
8 #include <linux/fs.h>
9 #include <linux/f2fs_fs.h>
10 #include <linux/pagemap.h>
11 #include <linux/sched.h>
12 #include <linux/ctype.h>
13 #include <linux/random.h>
14 #include <linux/dcache.h>
15 #include <linux/namei.h>
16 #include <linux/quotaops.h>
17
18 #include "f2fs.h"
19 #include "node.h"
20 #include "segment.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 xattr_size = 0;
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 (!f2fs_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         F2FS_I(inode)->i_crtime = inode->i_mtime;
54         inode->i_generation = prandom_u32();
55
56         if (S_ISDIR(inode->i_mode))
57                 F2FS_I(inode)->i_current_depth = 1;
58
59         err = insert_inode_locked(inode);
60         if (err) {
61                 err = -EINVAL;
62                 goto fail;
63         }
64
65         if (f2fs_sb_has_project_quota(sbi) &&
66                 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
67                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
68         else
69                 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
70                                                         F2FS_DEF_PROJID);
71
72         err = dquot_initialize(inode);
73         if (err)
74                 goto fail_drop;
75
76         set_inode_flag(inode, FI_NEW_INODE);
77
78         /* If the directory encrypted, then we should encrypt the inode. */
79         if ((f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
80                                 f2fs_may_encrypt(inode))
81                 f2fs_set_encrypted_inode(inode);
82
83         if (f2fs_sb_has_extra_attr(sbi)) {
84                 set_inode_flag(inode, FI_EXTRA_ATTR);
85                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
86         }
87
88         if (test_opt(sbi, INLINE_XATTR))
89                 set_inode_flag(inode, FI_INLINE_XATTR);
90
91         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
92                 set_inode_flag(inode, FI_INLINE_DATA);
93         if (f2fs_may_inline_dentry(inode))
94                 set_inode_flag(inode, FI_INLINE_DENTRY);
95
96         if (f2fs_sb_has_flexible_inline_xattr(sbi)) {
97                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
98                 if (f2fs_has_inline_xattr(inode))
99                         xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
100                 /* Otherwise, will be 0 */
101         } else if (f2fs_has_inline_xattr(inode) ||
102                                 f2fs_has_inline_dentry(inode)) {
103                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
104         }
105         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
106
107         f2fs_init_extent_tree(inode, NULL);
108
109         stat_inc_inline_xattr(inode);
110         stat_inc_inline_inode(inode);
111         stat_inc_inline_dir(inode);
112
113         F2FS_I(inode)->i_flags =
114                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
115
116         if (S_ISDIR(inode->i_mode))
117                 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL;
118
119         if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
120                 set_inode_flag(inode, FI_PROJ_INHERIT);
121
122         f2fs_set_inode_flags(inode);
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                         break;
186         }
187
188         up_read(&sbi->sb_lock);
189
190         if (i == cold_count + hot_count)
191                 return;
192
193         if (i < cold_count)
194                 file_set_cold(inode);
195         else
196                 file_set_hot(inode);
197 }
198
199 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
200                                                         bool hot, bool set)
201 {
202         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
203         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
204         int hot_count = sbi->raw_super->hot_ext_count;
205         int total_count = cold_count + hot_count;
206         int start, count;
207         int i;
208
209         if (set) {
210                 if (total_count == F2FS_MAX_EXTENSION)
211                         return -EINVAL;
212         } else {
213                 if (!hot && !cold_count)
214                         return -EINVAL;
215                 if (hot && !hot_count)
216                         return -EINVAL;
217         }
218
219         if (hot) {
220                 start = cold_count;
221                 count = total_count;
222         } else {
223                 start = 0;
224                 count = cold_count;
225         }
226
227         for (i = start; i < count; i++) {
228                 if (strcmp(name, extlist[i]))
229                         continue;
230
231                 if (set)
232                         return -EINVAL;
233
234                 memcpy(extlist[i], extlist[i + 1],
235                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
236                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
237                 if (hot)
238                         sbi->raw_super->hot_ext_count = hot_count - 1;
239                 else
240                         sbi->raw_super->extension_count =
241                                                 cpu_to_le32(cold_count - 1);
242                 return 0;
243         }
244
245         if (!set)
246                 return -EINVAL;
247
248         if (hot) {
249                 memcpy(extlist[count], name, strlen(name));
250                 sbi->raw_super->hot_ext_count = hot_count + 1;
251         } else {
252                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
253
254                 memcpy(buf, &extlist[cold_count],
255                                 F2FS_EXTENSION_LEN * hot_count);
256                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
257                 memcpy(extlist[cold_count], name, strlen(name));
258                 memcpy(&extlist[cold_count + 1], buf,
259                                 F2FS_EXTENSION_LEN * hot_count);
260                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
261         }
262         return 0;
263 }
264
265 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
266                                                 bool excl)
267 {
268         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
269         struct inode *inode;
270         nid_t ino = 0;
271         int err;
272
273         if (unlikely(f2fs_cp_error(sbi)))
274                 return -EIO;
275         err = f2fs_is_checkpoint_ready(sbi);
276         if (err)
277                 return err;
278
279         err = dquot_initialize(dir);
280         if (err)
281                 return err;
282
283         inode = f2fs_new_inode(dir, mode);
284         if (IS_ERR(inode))
285                 return PTR_ERR(inode);
286
287         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
288                 set_file_temperature(sbi, inode, dentry->d_name.name);
289
290         inode->i_op = &f2fs_file_inode_operations;
291         inode->i_fop = &f2fs_file_operations;
292         inode->i_mapping->a_ops = &f2fs_dblock_aops;
293         ino = inode->i_ino;
294
295         f2fs_lock_op(sbi);
296         err = f2fs_add_link(dentry, inode);
297         if (err)
298                 goto out;
299         f2fs_unlock_op(sbi);
300
301         f2fs_alloc_nid_done(sbi, ino);
302
303         d_instantiate_new(dentry, inode);
304
305         if (IS_DIRSYNC(dir))
306                 f2fs_sync_fs(sbi->sb, 1);
307
308         f2fs_balance_fs(sbi, true);
309         return 0;
310 out:
311         f2fs_handle_failed_inode(inode);
312         return err;
313 }
314
315 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
316                 struct dentry *dentry)
317 {
318         struct inode *inode = d_inode(old_dentry);
319         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
320         int err;
321
322         if (unlikely(f2fs_cp_error(sbi)))
323                 return -EIO;
324         err = f2fs_is_checkpoint_ready(sbi);
325         if (err)
326                 return err;
327
328         err = fscrypt_prepare_link(old_dentry, dir, dentry);
329         if (err)
330                 return err;
331
332         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
333                         (!projid_eq(F2FS_I(dir)->i_projid,
334                         F2FS_I(old_dentry->d_inode)->i_projid)))
335                 return -EXDEV;
336
337         err = dquot_initialize(dir);
338         if (err)
339                 return err;
340
341         f2fs_balance_fs(sbi, true);
342
343         inode->i_ctime = current_time(inode);
344         ihold(inode);
345
346         set_inode_flag(inode, FI_INC_LINK);
347         f2fs_lock_op(sbi);
348         err = f2fs_add_link(dentry, inode);
349         if (err)
350                 goto out;
351         f2fs_unlock_op(sbi);
352
353         d_instantiate(dentry, inode);
354
355         if (IS_DIRSYNC(dir))
356                 f2fs_sync_fs(sbi->sb, 1);
357         return 0;
358 out:
359         clear_inode_flag(inode, FI_INC_LINK);
360         iput(inode);
361         f2fs_unlock_op(sbi);
362         return err;
363 }
364
365 struct dentry *f2fs_get_parent(struct dentry *child)
366 {
367         struct qstr dotdot = QSTR_INIT("..", 2);
368         struct page *page;
369         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
370         if (!ino) {
371                 if (IS_ERR(page))
372                         return ERR_CAST(page);
373                 return ERR_PTR(-ENOENT);
374         }
375         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
376 }
377
378 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
379 {
380         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
381         struct qstr dot = QSTR_INIT(".", 1);
382         struct qstr dotdot = QSTR_INIT("..", 2);
383         struct f2fs_dir_entry *de;
384         struct page *page;
385         int err = 0;
386
387         if (f2fs_readonly(sbi->sb)) {
388                 f2fs_msg(sbi->sb, KERN_INFO,
389                         "skip recovering inline_dots inode (ino:%lu, pino:%u) "
390                         "in readonly mountpoint", dir->i_ino, pino);
391                 return 0;
392         }
393
394         err = dquot_initialize(dir);
395         if (err)
396                 return err;
397
398         f2fs_balance_fs(sbi, true);
399
400         f2fs_lock_op(sbi);
401
402         de = f2fs_find_entry(dir, &dot, &page);
403         if (de) {
404                 f2fs_put_page(page, 0);
405         } else if (IS_ERR(page)) {
406                 err = PTR_ERR(page);
407                 goto out;
408         } else {
409                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
410                 if (err)
411                         goto out;
412         }
413
414         de = f2fs_find_entry(dir, &dotdot, &page);
415         if (de)
416                 f2fs_put_page(page, 0);
417         else if (IS_ERR(page))
418                 err = PTR_ERR(page);
419         else
420                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
421 out:
422         if (!err)
423                 clear_inode_flag(dir, FI_INLINE_DOTS);
424
425         f2fs_unlock_op(sbi);
426         return err;
427 }
428
429 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
430                 unsigned int flags)
431 {
432         struct inode *inode = NULL;
433         struct f2fs_dir_entry *de;
434         struct page *page;
435         struct dentry *new;
436         nid_t ino = -1;
437         int err = 0;
438         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
439
440         trace_f2fs_lookup_start(dir, dentry, flags);
441
442         err = fscrypt_prepare_lookup(dir, dentry, flags);
443         if (err)
444                 goto out;
445
446         if (dentry->d_name.len > F2FS_NAME_LEN) {
447                 err = -ENAMETOOLONG;
448                 goto out;
449         }
450
451         de = f2fs_find_entry(dir, &dentry->d_name, &page);
452         if (!de) {
453                 if (IS_ERR(page)) {
454                         err = PTR_ERR(page);
455                         goto out;
456                 }
457                 goto out_splice;
458         }
459
460         ino = le32_to_cpu(de->ino);
461         f2fs_put_page(page, 0);
462
463         inode = f2fs_iget(dir->i_sb, ino);
464         if (IS_ERR(inode)) {
465                 err = PTR_ERR(inode);
466                 goto out;
467         }
468
469         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
470                 err = __recover_dot_dentries(dir, root_ino);
471                 if (err)
472                         goto out_iput;
473         }
474
475         if (f2fs_has_inline_dots(inode)) {
476                 err = __recover_dot_dentries(inode, dir->i_ino);
477                 if (err)
478                         goto out_iput;
479         }
480         if (f2fs_encrypted_inode(dir) &&
481             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
482             !fscrypt_has_permitted_context(dir, inode)) {
483                 f2fs_msg(inode->i_sb, KERN_WARNING,
484                          "Inconsistent encryption contexts: %lu/%lu",
485                          dir->i_ino, inode->i_ino);
486                 err = -EPERM;
487                 goto out_iput;
488         }
489 out_splice:
490         new = d_splice_alias(inode, dentry);
491         if (IS_ERR(new))
492                 err = PTR_ERR(new);
493         trace_f2fs_lookup_end(dir, dentry, ino, err);
494         return new;
495 out_iput:
496         iput(inode);
497 out:
498         trace_f2fs_lookup_end(dir, dentry, ino, err);
499         return ERR_PTR(err);
500 }
501
502 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
503 {
504         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
505         struct inode *inode = d_inode(dentry);
506         struct f2fs_dir_entry *de;
507         struct page *page;
508         int err = -ENOENT;
509
510         trace_f2fs_unlink_enter(dir, dentry);
511
512         if (unlikely(f2fs_cp_error(sbi)))
513                 return -EIO;
514
515         err = dquot_initialize(dir);
516         if (err)
517                 return err;
518         err = dquot_initialize(inode);
519         if (err)
520                 return err;
521
522         de = f2fs_find_entry(dir, &dentry->d_name, &page);
523         if (!de) {
524                 if (IS_ERR(page))
525                         err = PTR_ERR(page);
526                 goto fail;
527         }
528
529         f2fs_balance_fs(sbi, true);
530
531         f2fs_lock_op(sbi);
532         err = f2fs_acquire_orphan_inode(sbi);
533         if (err) {
534                 f2fs_unlock_op(sbi);
535                 f2fs_put_page(page, 0);
536                 goto fail;
537         }
538         f2fs_delete_entry(de, page, dir, inode);
539         f2fs_unlock_op(sbi);
540
541         if (IS_DIRSYNC(dir))
542                 f2fs_sync_fs(sbi->sb, 1);
543 fail:
544         trace_f2fs_unlink_exit(inode, err);
545         return err;
546 }
547
548 static const char *f2fs_get_link(struct dentry *dentry,
549                                  struct inode *inode,
550                                  struct delayed_call *done)
551 {
552         const char *link = page_get_link(dentry, inode, done);
553         if (!IS_ERR(link) && !*link) {
554                 /* this is broken symlink case */
555                 do_delayed_call(done);
556                 clear_delayed_call(done);
557                 link = ERR_PTR(-ENOENT);
558         }
559         return link;
560 }
561
562 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
563                                         const char *symname)
564 {
565         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
566         struct inode *inode;
567         size_t len = strlen(symname);
568         struct fscrypt_str disk_link;
569         int err;
570
571         if (unlikely(f2fs_cp_error(sbi)))
572                 return -EIO;
573         err = f2fs_is_checkpoint_ready(sbi);
574         if (err)
575                 return err;
576
577         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
578                                       &disk_link);
579         if (err)
580                 return err;
581
582         err = dquot_initialize(dir);
583         if (err)
584                 return err;
585
586         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
587         if (IS_ERR(inode))
588                 return PTR_ERR(inode);
589
590         if (IS_ENCRYPTED(inode))
591                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
592         else
593                 inode->i_op = &f2fs_symlink_inode_operations;
594         inode_nohighmem(inode);
595         inode->i_mapping->a_ops = &f2fs_dblock_aops;
596
597         f2fs_lock_op(sbi);
598         err = f2fs_add_link(dentry, inode);
599         if (err)
600                 goto out_f2fs_handle_failed_inode;
601         f2fs_unlock_op(sbi);
602         f2fs_alloc_nid_done(sbi, inode->i_ino);
603
604         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
605         if (err)
606                 goto err_out;
607
608         err = page_symlink(inode, disk_link.name, disk_link.len);
609
610 err_out:
611         d_instantiate_new(dentry, inode);
612
613         /*
614          * Let's flush symlink data in order to avoid broken symlink as much as
615          * possible. Nevertheless, fsyncing is the best way, but there is no
616          * way to get a file descriptor in order to flush that.
617          *
618          * Note that, it needs to do dir->fsync to make this recoverable.
619          * If the symlink path is stored into inline_data, there is no
620          * performance regression.
621          */
622         if (!err) {
623                 filemap_write_and_wait_range(inode->i_mapping, 0,
624                                                         disk_link.len - 1);
625
626                 if (IS_DIRSYNC(dir))
627                         f2fs_sync_fs(sbi->sb, 1);
628         } else {
629                 f2fs_unlink(dir, dentry);
630         }
631
632         f2fs_balance_fs(sbi, true);
633         goto out_free_encrypted_link;
634
635 out_f2fs_handle_failed_inode:
636         f2fs_handle_failed_inode(inode);
637 out_free_encrypted_link:
638         if (disk_link.name != (unsigned char *)symname)
639                 kvfree(disk_link.name);
640         return err;
641 }
642
643 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
644 {
645         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
646         struct inode *inode;
647         int err;
648
649         if (unlikely(f2fs_cp_error(sbi)))
650                 return -EIO;
651
652         err = dquot_initialize(dir);
653         if (err)
654                 return err;
655
656         inode = f2fs_new_inode(dir, S_IFDIR | mode);
657         if (IS_ERR(inode))
658                 return PTR_ERR(inode);
659
660         inode->i_op = &f2fs_dir_inode_operations;
661         inode->i_fop = &f2fs_dir_operations;
662         inode->i_mapping->a_ops = &f2fs_dblock_aops;
663         inode_nohighmem(inode);
664
665         set_inode_flag(inode, FI_INC_LINK);
666         f2fs_lock_op(sbi);
667         err = f2fs_add_link(dentry, inode);
668         if (err)
669                 goto out_fail;
670         f2fs_unlock_op(sbi);
671
672         f2fs_alloc_nid_done(sbi, inode->i_ino);
673
674         d_instantiate_new(dentry, inode);
675
676         if (IS_DIRSYNC(dir))
677                 f2fs_sync_fs(sbi->sb, 1);
678
679         f2fs_balance_fs(sbi, true);
680         return 0;
681
682 out_fail:
683         clear_inode_flag(inode, FI_INC_LINK);
684         f2fs_handle_failed_inode(inode);
685         return err;
686 }
687
688 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
689 {
690         struct inode *inode = d_inode(dentry);
691         if (f2fs_empty_dir(inode))
692                 return f2fs_unlink(dir, dentry);
693         return -ENOTEMPTY;
694 }
695
696 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
697                                 umode_t mode, dev_t rdev)
698 {
699         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
700         struct inode *inode;
701         int err = 0;
702
703         if (unlikely(f2fs_cp_error(sbi)))
704                 return -EIO;
705         err = f2fs_is_checkpoint_ready(sbi);
706         if (err)
707                 return err;
708
709         err = dquot_initialize(dir);
710         if (err)
711                 return err;
712
713         inode = f2fs_new_inode(dir, mode);
714         if (IS_ERR(inode))
715                 return PTR_ERR(inode);
716
717         init_special_inode(inode, inode->i_mode, rdev);
718         inode->i_op = &f2fs_special_inode_operations;
719
720         f2fs_lock_op(sbi);
721         err = f2fs_add_link(dentry, inode);
722         if (err)
723                 goto out;
724         f2fs_unlock_op(sbi);
725
726         f2fs_alloc_nid_done(sbi, inode->i_ino);
727
728         d_instantiate_new(dentry, inode);
729
730         if (IS_DIRSYNC(dir))
731                 f2fs_sync_fs(sbi->sb, 1);
732
733         f2fs_balance_fs(sbi, true);
734         return 0;
735 out:
736         f2fs_handle_failed_inode(inode);
737         return err;
738 }
739
740 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
741                                         umode_t mode, struct inode **whiteout)
742 {
743         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
744         struct inode *inode;
745         int err;
746
747         err = dquot_initialize(dir);
748         if (err)
749                 return err;
750
751         inode = f2fs_new_inode(dir, mode);
752         if (IS_ERR(inode))
753                 return PTR_ERR(inode);
754
755         if (whiteout) {
756                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
757                 inode->i_op = &f2fs_special_inode_operations;
758         } else {
759                 inode->i_op = &f2fs_file_inode_operations;
760                 inode->i_fop = &f2fs_file_operations;
761                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
762         }
763
764         f2fs_lock_op(sbi);
765         err = f2fs_acquire_orphan_inode(sbi);
766         if (err)
767                 goto out;
768
769         err = f2fs_do_tmpfile(inode, dir);
770         if (err)
771                 goto release_out;
772
773         /*
774          * add this non-linked tmpfile to orphan list, in this way we could
775          * remove all unused data of tmpfile after abnormal power-off.
776          */
777         f2fs_add_orphan_inode(inode);
778         f2fs_alloc_nid_done(sbi, inode->i_ino);
779
780         if (whiteout) {
781                 f2fs_i_links_write(inode, false);
782                 *whiteout = inode;
783         } else {
784                 d_tmpfile(dentry, inode);
785         }
786         /* link_count was changed by d_tmpfile as well. */
787         f2fs_unlock_op(sbi);
788         unlock_new_inode(inode);
789
790         f2fs_balance_fs(sbi, true);
791         return 0;
792
793 release_out:
794         f2fs_release_orphan_inode(sbi);
795 out:
796         f2fs_handle_failed_inode(inode);
797         return err;
798 }
799
800 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
801 {
802         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
803
804         if (unlikely(f2fs_cp_error(sbi)))
805                 return -EIO;
806
807         if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
808                 int err = fscrypt_get_encryption_info(dir);
809                 if (err)
810                         return err;
811         }
812
813         return __f2fs_tmpfile(dir, dentry, mode, NULL);
814 }
815
816 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
817 {
818         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
819                 return -EIO;
820
821         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
822 }
823
824 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
825                         struct inode *new_dir, struct dentry *new_dentry,
826                         unsigned int flags)
827 {
828         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
829         struct inode *old_inode = d_inode(old_dentry);
830         struct inode *new_inode = d_inode(new_dentry);
831         struct inode *whiteout = NULL;
832         struct page *old_dir_page;
833         struct page *old_page, *new_page = NULL;
834         struct f2fs_dir_entry *old_dir_entry = NULL;
835         struct f2fs_dir_entry *old_entry;
836         struct f2fs_dir_entry *new_entry;
837         bool is_old_inline = f2fs_has_inline_dentry(old_dir);
838         int err;
839
840         if (unlikely(f2fs_cp_error(sbi)))
841                 return -EIO;
842         err = f2fs_is_checkpoint_ready(sbi);
843         if (err)
844                 return err;
845
846         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
847                         (!projid_eq(F2FS_I(new_dir)->i_projid,
848                         F2FS_I(old_dentry->d_inode)->i_projid)))
849                 return -EXDEV;
850
851         err = dquot_initialize(old_dir);
852         if (err)
853                 goto out;
854
855         err = dquot_initialize(new_dir);
856         if (err)
857                 goto out;
858
859         if (new_inode) {
860                 err = dquot_initialize(new_inode);
861                 if (err)
862                         goto out;
863         }
864
865         err = -ENOENT;
866         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
867         if (!old_entry) {
868                 if (IS_ERR(old_page))
869                         err = PTR_ERR(old_page);
870                 goto out;
871         }
872
873         if (S_ISDIR(old_inode->i_mode)) {
874                 old_dir_entry = f2fs_parent_dir(old_inode, &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_old;
879                 }
880         }
881
882         if (flags & RENAME_WHITEOUT) {
883                 err = f2fs_create_whiteout(old_dir, &whiteout);
884                 if (err)
885                         goto out_dir;
886         }
887
888         if (new_inode) {
889
890                 err = -ENOTEMPTY;
891                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
892                         goto out_whiteout;
893
894                 err = -ENOENT;
895                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
896                                                 &new_page);
897                 if (!new_entry) {
898                         if (IS_ERR(new_page))
899                                 err = PTR_ERR(new_page);
900                         goto out_whiteout;
901                 }
902
903                 f2fs_balance_fs(sbi, true);
904
905                 f2fs_lock_op(sbi);
906
907                 err = f2fs_acquire_orphan_inode(sbi);
908                 if (err)
909                         goto put_out_dir;
910
911                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
912
913                 new_inode->i_ctime = current_time(new_inode);
914                 down_write(&F2FS_I(new_inode)->i_sem);
915                 if (old_dir_entry)
916                         f2fs_i_links_write(new_inode, false);
917                 f2fs_i_links_write(new_inode, false);
918                 up_write(&F2FS_I(new_inode)->i_sem);
919
920                 if (!new_inode->i_nlink)
921                         f2fs_add_orphan_inode(new_inode);
922                 else
923                         f2fs_release_orphan_inode(sbi);
924         } else {
925                 f2fs_balance_fs(sbi, true);
926
927                 f2fs_lock_op(sbi);
928
929                 err = f2fs_add_link(new_dentry, old_inode);
930                 if (err) {
931                         f2fs_unlock_op(sbi);
932                         goto out_whiteout;
933                 }
934
935                 if (old_dir_entry)
936                         f2fs_i_links_write(new_dir, true);
937
938                 /*
939                  * old entry and new entry can locate in the same inline
940                  * dentry in inode, when attaching new entry in inline dentry,
941                  * it could force inline dentry conversion, after that,
942                  * old_entry and old_page will point to wrong address, in
943                  * order to avoid this, let's do the check and update here.
944                  */
945                 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
946                         f2fs_put_page(old_page, 0);
947                         old_page = NULL;
948
949                         old_entry = f2fs_find_entry(old_dir,
950                                                 &old_dentry->d_name, &old_page);
951                         if (!old_entry) {
952                                 err = -ENOENT;
953                                 if (IS_ERR(old_page))
954                                         err = PTR_ERR(old_page);
955                                 f2fs_unlock_op(sbi);
956                                 goto out_whiteout;
957                         }
958                 }
959         }
960
961         down_write(&F2FS_I(old_inode)->i_sem);
962         if (!old_dir_entry || whiteout)
963                 file_lost_pino(old_inode);
964         else
965                 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
966         up_write(&F2FS_I(old_inode)->i_sem);
967
968         old_inode->i_ctime = current_time(old_inode);
969         f2fs_mark_inode_dirty_sync(old_inode, false);
970
971         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
972
973         if (whiteout) {
974                 whiteout->i_state |= I_LINKABLE;
975                 set_inode_flag(whiteout, FI_INC_LINK);
976                 err = f2fs_add_link(old_dentry, whiteout);
977                 if (err)
978                         goto put_out_dir;
979                 whiteout->i_state &= ~I_LINKABLE;
980                 iput(whiteout);
981         }
982
983         if (old_dir_entry) {
984                 if (old_dir != new_dir && !whiteout)
985                         f2fs_set_link(old_inode, old_dir_entry,
986                                                 old_dir_page, new_dir);
987                 else
988                         f2fs_put_page(old_dir_page, 0);
989                 f2fs_i_links_write(old_dir, false);
990         }
991         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
992                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
993                 if (S_ISDIR(old_inode->i_mode))
994                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
995                                                         TRANS_DIR_INO);
996         }
997
998         f2fs_unlock_op(sbi);
999
1000         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1001                 f2fs_sync_fs(sbi->sb, 1);
1002
1003         f2fs_update_time(sbi, REQ_TIME);
1004         return 0;
1005
1006 put_out_dir:
1007         f2fs_unlock_op(sbi);
1008         if (new_page)
1009                 f2fs_put_page(new_page, 0);
1010 out_whiteout:
1011         if (whiteout)
1012                 iput(whiteout);
1013 out_dir:
1014         if (old_dir_entry)
1015                 f2fs_put_page(old_dir_page, 0);
1016 out_old:
1017         f2fs_put_page(old_page, 0);
1018 out:
1019         return err;
1020 }
1021
1022 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1023                              struct inode *new_dir, struct dentry *new_dentry)
1024 {
1025         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1026         struct inode *old_inode = d_inode(old_dentry);
1027         struct inode *new_inode = d_inode(new_dentry);
1028         struct page *old_dir_page, *new_dir_page;
1029         struct page *old_page, *new_page;
1030         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1031         struct f2fs_dir_entry *old_entry, *new_entry;
1032         int old_nlink = 0, new_nlink = 0;
1033         int err;
1034
1035         if (unlikely(f2fs_cp_error(sbi)))
1036                 return -EIO;
1037         err = f2fs_is_checkpoint_ready(sbi);
1038         if (err)
1039                 return err;
1040
1041         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1042                         !projid_eq(F2FS_I(new_dir)->i_projid,
1043                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1044             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1045                         !projid_eq(F2FS_I(old_dir)->i_projid,
1046                         F2FS_I(new_dentry->d_inode)->i_projid)))
1047                 return -EXDEV;
1048
1049         err = dquot_initialize(old_dir);
1050         if (err)
1051                 goto out;
1052
1053         err = dquot_initialize(new_dir);
1054         if (err)
1055                 goto out;
1056
1057         err = -ENOENT;
1058         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1059         if (!old_entry) {
1060                 if (IS_ERR(old_page))
1061                         err = PTR_ERR(old_page);
1062                 goto out;
1063         }
1064
1065         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1066         if (!new_entry) {
1067                 if (IS_ERR(new_page))
1068                         err = PTR_ERR(new_page);
1069                 goto out_old;
1070         }
1071
1072         /* prepare for updating ".." directory entry info later */
1073         if (old_dir != new_dir) {
1074                 if (S_ISDIR(old_inode->i_mode)) {
1075                         old_dir_entry = f2fs_parent_dir(old_inode,
1076                                                         &old_dir_page);
1077                         if (!old_dir_entry) {
1078                                 if (IS_ERR(old_dir_page))
1079                                         err = PTR_ERR(old_dir_page);
1080                                 goto out_new;
1081                         }
1082                 }
1083
1084                 if (S_ISDIR(new_inode->i_mode)) {
1085                         new_dir_entry = f2fs_parent_dir(new_inode,
1086                                                         &new_dir_page);
1087                         if (!new_dir_entry) {
1088                                 if (IS_ERR(new_dir_page))
1089                                         err = PTR_ERR(new_dir_page);
1090                                 goto out_old_dir;
1091                         }
1092                 }
1093         }
1094
1095         /*
1096          * If cross rename between file and directory those are not
1097          * in the same directory, we will inc nlink of file's parent
1098          * later, so we should check upper boundary of its nlink.
1099          */
1100         if ((!old_dir_entry || !new_dir_entry) &&
1101                                 old_dir_entry != new_dir_entry) {
1102                 old_nlink = old_dir_entry ? -1 : 1;
1103                 new_nlink = -old_nlink;
1104                 err = -EMLINK;
1105                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1106                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1107                         goto out_new_dir;
1108         }
1109
1110         f2fs_balance_fs(sbi, true);
1111
1112         f2fs_lock_op(sbi);
1113
1114         /* update ".." directory entry info of old dentry */
1115         if (old_dir_entry)
1116                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1117
1118         /* update ".." directory entry info of new dentry */
1119         if (new_dir_entry)
1120                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1121
1122         /* update directory entry info of old dir inode */
1123         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1124
1125         down_write(&F2FS_I(old_inode)->i_sem);
1126         file_lost_pino(old_inode);
1127         up_write(&F2FS_I(old_inode)->i_sem);
1128
1129         old_dir->i_ctime = current_time(old_dir);
1130         if (old_nlink) {
1131                 down_write(&F2FS_I(old_dir)->i_sem);
1132                 f2fs_i_links_write(old_dir, old_nlink > 0);
1133                 up_write(&F2FS_I(old_dir)->i_sem);
1134         }
1135         f2fs_mark_inode_dirty_sync(old_dir, false);
1136
1137         /* update directory entry info of new dir inode */
1138         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1139
1140         down_write(&F2FS_I(new_inode)->i_sem);
1141         file_lost_pino(new_inode);
1142         up_write(&F2FS_I(new_inode)->i_sem);
1143
1144         new_dir->i_ctime = current_time(new_dir);
1145         if (new_nlink) {
1146                 down_write(&F2FS_I(new_dir)->i_sem);
1147                 f2fs_i_links_write(new_dir, new_nlink > 0);
1148                 up_write(&F2FS_I(new_dir)->i_sem);
1149         }
1150         f2fs_mark_inode_dirty_sync(new_dir, false);
1151
1152         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1153                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1154                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1155         }
1156
1157         f2fs_unlock_op(sbi);
1158
1159         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1160                 f2fs_sync_fs(sbi->sb, 1);
1161
1162         f2fs_update_time(sbi, REQ_TIME);
1163         return 0;
1164 out_new_dir:
1165         if (new_dir_entry) {
1166                 f2fs_put_page(new_dir_page, 0);
1167         }
1168 out_old_dir:
1169         if (old_dir_entry) {
1170                 f2fs_put_page(old_dir_page, 0);
1171         }
1172 out_new:
1173         f2fs_put_page(new_page, 0);
1174 out_old:
1175         f2fs_put_page(old_page, 0);
1176 out:
1177         return err;
1178 }
1179
1180 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1181                         struct inode *new_dir, struct dentry *new_dentry,
1182                         unsigned int flags)
1183 {
1184         int err;
1185
1186         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1187                 return -EINVAL;
1188
1189         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1190                                      flags);
1191         if (err)
1192                 return err;
1193
1194         if (flags & RENAME_EXCHANGE) {
1195                 return f2fs_cross_rename(old_dir, old_dentry,
1196                                          new_dir, new_dentry);
1197         }
1198         /*
1199          * VFS has already handled the new dentry existence case,
1200          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1201          */
1202         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1203 }
1204
1205 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1206                                            struct inode *inode,
1207                                            struct delayed_call *done)
1208 {
1209         struct page *page;
1210         const char *target;
1211
1212         if (!dentry)
1213                 return ERR_PTR(-ECHILD);
1214
1215         page = read_mapping_page(inode->i_mapping, 0, NULL);
1216         if (IS_ERR(page))
1217                 return ERR_CAST(page);
1218
1219         target = fscrypt_get_symlink(inode, page_address(page),
1220                                      inode->i_sb->s_blocksize, done);
1221         put_page(page);
1222         return target;
1223 }
1224
1225 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1226         .get_link       = f2fs_encrypted_get_link,
1227         .getattr        = f2fs_getattr,
1228         .setattr        = f2fs_setattr,
1229 #ifdef CONFIG_F2FS_FS_XATTR
1230         .listxattr      = f2fs_listxattr,
1231 #endif
1232 };
1233
1234 const struct inode_operations f2fs_dir_inode_operations = {
1235         .create         = f2fs_create,
1236         .lookup         = f2fs_lookup,
1237         .link           = f2fs_link,
1238         .unlink         = f2fs_unlink,
1239         .symlink        = f2fs_symlink,
1240         .mkdir          = f2fs_mkdir,
1241         .rmdir          = f2fs_rmdir,
1242         .mknod          = f2fs_mknod,
1243         .rename         = f2fs_rename2,
1244         .tmpfile        = f2fs_tmpfile,
1245         .getattr        = f2fs_getattr,
1246         .setattr        = f2fs_setattr,
1247         .get_acl        = f2fs_get_acl,
1248         .set_acl        = f2fs_set_acl,
1249 #ifdef CONFIG_F2FS_FS_XATTR
1250         .listxattr      = f2fs_listxattr,
1251 #endif
1252 };
1253
1254 const struct inode_operations f2fs_symlink_inode_operations = {
1255         .get_link       = f2fs_get_link,
1256         .getattr        = f2fs_getattr,
1257         .setattr        = f2fs_setattr,
1258 #ifdef CONFIG_F2FS_FS_XATTR
1259         .listxattr      = f2fs_listxattr,
1260 #endif
1261 };
1262
1263 const struct inode_operations f2fs_special_inode_operations = {
1264         .getattr        = f2fs_getattr,
1265         .setattr        = f2fs_setattr,
1266         .get_acl        = f2fs_get_acl,
1267         .set_acl        = f2fs_set_acl,
1268 #ifdef CONFIG_F2FS_FS_XATTR
1269         .listxattr      = f2fs_listxattr,
1270 #endif
1271 };