epoll: add syscall epoll_pwait2
[linux-2.6-microblaze.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         bool encrypt = 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 (!f2fs_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 = current_time(inode);
54         F2FS_I(inode)->i_crtime = inode->i_mtime;
55         inode->i_generation = prandom_u32();
56
57         if (S_ISDIR(inode->i_mode))
58                 F2FS_I(inode)->i_current_depth = 1;
59
60         err = insert_inode_locked(inode);
61         if (err) {
62                 err = -EINVAL;
63                 goto fail;
64         }
65
66         if (f2fs_sb_has_project_quota(sbi) &&
67                 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
68                 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
69         else
70                 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
71                                                         F2FS_DEF_PROJID);
72
73         err = fscrypt_prepare_new_inode(dir, inode, &encrypt);
74         if (err)
75                 goto fail_drop;
76
77         err = dquot_initialize(inode);
78         if (err)
79                 goto fail_drop;
80
81         set_inode_flag(inode, FI_NEW_INODE);
82
83         if (encrypt)
84                 f2fs_set_encrypted_inode(inode);
85
86         if (f2fs_sb_has_extra_attr(sbi)) {
87                 set_inode_flag(inode, FI_EXTRA_ATTR);
88                 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
89         }
90
91         if (test_opt(sbi, INLINE_XATTR))
92                 set_inode_flag(inode, FI_INLINE_XATTR);
93
94         if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
95                 set_inode_flag(inode, FI_INLINE_DATA);
96         if (f2fs_may_inline_dentry(inode))
97                 set_inode_flag(inode, FI_INLINE_DENTRY);
98
99         if (f2fs_sb_has_flexible_inline_xattr(sbi)) {
100                 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
101                 if (f2fs_has_inline_xattr(inode))
102                         xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
103                 /* Otherwise, will be 0 */
104         } else if (f2fs_has_inline_xattr(inode) ||
105                                 f2fs_has_inline_dentry(inode)) {
106                 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
107         }
108         F2FS_I(inode)->i_inline_xattr_size = xattr_size;
109
110         f2fs_init_extent_tree(inode, NULL);
111
112         stat_inc_inline_xattr(inode);
113         stat_inc_inline_inode(inode);
114         stat_inc_inline_dir(inode);
115
116         F2FS_I(inode)->i_flags =
117                 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
118
119         if (S_ISDIR(inode->i_mode))
120                 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL;
121
122         if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
123                 set_inode_flag(inode, FI_PROJ_INHERIT);
124
125         if (f2fs_sb_has_compression(sbi)) {
126                 /* Inherit the compression flag in directory */
127                 if ((F2FS_I(dir)->i_flags & F2FS_COMPR_FL) &&
128                                         f2fs_may_compress(inode))
129                         set_compress_context(inode);
130         }
131
132         f2fs_set_inode_flags(inode);
133
134         trace_f2fs_new_inode(inode, 0);
135         return inode;
136
137 fail:
138         trace_f2fs_new_inode(inode, err);
139         make_bad_inode(inode);
140         if (nid_free)
141                 set_inode_flag(inode, FI_FREE_NID);
142         iput(inode);
143         return ERR_PTR(err);
144 fail_drop:
145         trace_f2fs_new_inode(inode, err);
146         dquot_drop(inode);
147         inode->i_flags |= S_NOQUOTA;
148         if (nid_free)
149                 set_inode_flag(inode, FI_FREE_NID);
150         clear_nlink(inode);
151         unlock_new_inode(inode);
152         iput(inode);
153         return ERR_PTR(err);
154 }
155
156 static inline int is_extension_exist(const unsigned char *s, const char *sub)
157 {
158         size_t slen = strlen(s);
159         size_t sublen = strlen(sub);
160         int i;
161
162         if (sublen == 1 && *sub == '*')
163                 return 1;
164
165         /*
166          * filename format of multimedia file should be defined as:
167          * "filename + '.' + extension + (optional: '.' + temp extension)".
168          */
169         if (slen < sublen + 2)
170                 return 0;
171
172         for (i = 1; i < slen - sublen; i++) {
173                 if (s[i] != '.')
174                         continue;
175                 if (!strncasecmp(s + i + 1, sub, sublen))
176                         return 1;
177         }
178
179         return 0;
180 }
181
182 /*
183  * Set file's temperature for hot/cold data separation
184  */
185 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
186                 const unsigned char *name)
187 {
188         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
189         int i, cold_count, hot_count;
190
191         down_read(&sbi->sb_lock);
192
193         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
194         hot_count = sbi->raw_super->hot_ext_count;
195
196         for (i = 0; i < cold_count + hot_count; i++) {
197                 if (is_extension_exist(name, extlist[i]))
198                         break;
199         }
200
201         up_read(&sbi->sb_lock);
202
203         if (i == cold_count + hot_count)
204                 return;
205
206         if (i < cold_count)
207                 file_set_cold(inode);
208         else
209                 file_set_hot(inode);
210 }
211
212 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
213                                                         bool hot, bool set)
214 {
215         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
216         int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
217         int hot_count = sbi->raw_super->hot_ext_count;
218         int total_count = cold_count + hot_count;
219         int start, count;
220         int i;
221
222         if (set) {
223                 if (total_count == F2FS_MAX_EXTENSION)
224                         return -EINVAL;
225         } else {
226                 if (!hot && !cold_count)
227                         return -EINVAL;
228                 if (hot && !hot_count)
229                         return -EINVAL;
230         }
231
232         if (hot) {
233                 start = cold_count;
234                 count = total_count;
235         } else {
236                 start = 0;
237                 count = cold_count;
238         }
239
240         for (i = start; i < count; i++) {
241                 if (strcmp(name, extlist[i]))
242                         continue;
243
244                 if (set)
245                         return -EINVAL;
246
247                 memcpy(extlist[i], extlist[i + 1],
248                                 F2FS_EXTENSION_LEN * (total_count - i - 1));
249                 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
250                 if (hot)
251                         sbi->raw_super->hot_ext_count = hot_count - 1;
252                 else
253                         sbi->raw_super->extension_count =
254                                                 cpu_to_le32(cold_count - 1);
255                 return 0;
256         }
257
258         if (!set)
259                 return -EINVAL;
260
261         if (hot) {
262                 memcpy(extlist[count], name, strlen(name));
263                 sbi->raw_super->hot_ext_count = hot_count + 1;
264         } else {
265                 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
266
267                 memcpy(buf, &extlist[cold_count],
268                                 F2FS_EXTENSION_LEN * hot_count);
269                 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
270                 memcpy(extlist[cold_count], name, strlen(name));
271                 memcpy(&extlist[cold_count + 1], buf,
272                                 F2FS_EXTENSION_LEN * hot_count);
273                 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
274         }
275         return 0;
276 }
277
278 static void set_compress_inode(struct f2fs_sb_info *sbi, struct inode *inode,
279                                                 const unsigned char *name)
280 {
281         __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
282         unsigned char (*ext)[F2FS_EXTENSION_LEN];
283         unsigned int ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
284         int i, cold_count, hot_count;
285
286         if (!f2fs_sb_has_compression(sbi) ||
287                         is_inode_flag_set(inode, FI_COMPRESSED_FILE) ||
288                         F2FS_I(inode)->i_flags & F2FS_NOCOMP_FL ||
289                         !f2fs_may_compress(inode))
290                 return;
291
292         down_read(&sbi->sb_lock);
293
294         cold_count = le32_to_cpu(sbi->raw_super->extension_count);
295         hot_count = sbi->raw_super->hot_ext_count;
296
297         for (i = cold_count; i < cold_count + hot_count; i++) {
298                 if (is_extension_exist(name, extlist[i])) {
299                         up_read(&sbi->sb_lock);
300                         return;
301                 }
302         }
303
304         up_read(&sbi->sb_lock);
305
306         ext = F2FS_OPTION(sbi).extensions;
307
308         for (i = 0; i < ext_cnt; i++) {
309                 if (!is_extension_exist(name, ext[i]))
310                         continue;
311
312                 set_compress_context(inode);
313                 return;
314         }
315 }
316
317 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
318                                                 bool excl)
319 {
320         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
321         struct inode *inode;
322         nid_t ino = 0;
323         int err;
324
325         if (unlikely(f2fs_cp_error(sbi)))
326                 return -EIO;
327         if (!f2fs_is_checkpoint_ready(sbi))
328                 return -ENOSPC;
329
330         err = dquot_initialize(dir);
331         if (err)
332                 return err;
333
334         inode = f2fs_new_inode(dir, mode);
335         if (IS_ERR(inode))
336                 return PTR_ERR(inode);
337
338         if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
339                 set_file_temperature(sbi, inode, dentry->d_name.name);
340
341         set_compress_inode(sbi, inode, dentry->d_name.name);
342
343         inode->i_op = &f2fs_file_inode_operations;
344         inode->i_fop = &f2fs_file_operations;
345         inode->i_mapping->a_ops = &f2fs_dblock_aops;
346         ino = inode->i_ino;
347
348         f2fs_lock_op(sbi);
349         err = f2fs_add_link(dentry, inode);
350         if (err)
351                 goto out;
352         f2fs_unlock_op(sbi);
353
354         f2fs_alloc_nid_done(sbi, ino);
355
356         d_instantiate_new(dentry, inode);
357
358         if (IS_DIRSYNC(dir))
359                 f2fs_sync_fs(sbi->sb, 1);
360
361         f2fs_balance_fs(sbi, true);
362         return 0;
363 out:
364         f2fs_handle_failed_inode(inode);
365         return err;
366 }
367
368 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
369                 struct dentry *dentry)
370 {
371         struct inode *inode = d_inode(old_dentry);
372         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
373         int err;
374
375         if (unlikely(f2fs_cp_error(sbi)))
376                 return -EIO;
377         if (!f2fs_is_checkpoint_ready(sbi))
378                 return -ENOSPC;
379
380         err = fscrypt_prepare_link(old_dentry, dir, dentry);
381         if (err)
382                 return err;
383
384         if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
385                         (!projid_eq(F2FS_I(dir)->i_projid,
386                         F2FS_I(old_dentry->d_inode)->i_projid)))
387                 return -EXDEV;
388
389         err = dquot_initialize(dir);
390         if (err)
391                 return err;
392
393         f2fs_balance_fs(sbi, true);
394
395         inode->i_ctime = current_time(inode);
396         ihold(inode);
397
398         set_inode_flag(inode, FI_INC_LINK);
399         f2fs_lock_op(sbi);
400         err = f2fs_add_link(dentry, inode);
401         if (err)
402                 goto out;
403         f2fs_unlock_op(sbi);
404
405         d_instantiate(dentry, inode);
406
407         if (IS_DIRSYNC(dir))
408                 f2fs_sync_fs(sbi->sb, 1);
409         return 0;
410 out:
411         clear_inode_flag(inode, FI_INC_LINK);
412         iput(inode);
413         f2fs_unlock_op(sbi);
414         return err;
415 }
416
417 struct dentry *f2fs_get_parent(struct dentry *child)
418 {
419         struct qstr dotdot = QSTR_INIT("..", 2);
420         struct page *page;
421         unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
422         if (!ino) {
423                 if (IS_ERR(page))
424                         return ERR_CAST(page);
425                 return ERR_PTR(-ENOENT);
426         }
427         return d_obtain_alias(f2fs_iget(child->d_sb, ino));
428 }
429
430 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
431 {
432         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
433         struct qstr dot = QSTR_INIT(".", 1);
434         struct qstr dotdot = QSTR_INIT("..", 2);
435         struct f2fs_dir_entry *de;
436         struct page *page;
437         int err = 0;
438
439         if (f2fs_readonly(sbi->sb)) {
440                 f2fs_info(sbi, "skip recovering inline_dots inode (ino:%lu, pino:%u) in readonly mountpoint",
441                           dir->i_ino, pino);
442                 return 0;
443         }
444
445         err = dquot_initialize(dir);
446         if (err)
447                 return err;
448
449         f2fs_balance_fs(sbi, true);
450
451         f2fs_lock_op(sbi);
452
453         de = f2fs_find_entry(dir, &dot, &page);
454         if (de) {
455                 f2fs_put_page(page, 0);
456         } else if (IS_ERR(page)) {
457                 err = PTR_ERR(page);
458                 goto out;
459         } else {
460                 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
461                 if (err)
462                         goto out;
463         }
464
465         de = f2fs_find_entry(dir, &dotdot, &page);
466         if (de)
467                 f2fs_put_page(page, 0);
468         else if (IS_ERR(page))
469                 err = PTR_ERR(page);
470         else
471                 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
472 out:
473         if (!err)
474                 clear_inode_flag(dir, FI_INLINE_DOTS);
475
476         f2fs_unlock_op(sbi);
477         return err;
478 }
479
480 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
481                 unsigned int flags)
482 {
483         struct inode *inode = NULL;
484         struct f2fs_dir_entry *de;
485         struct page *page;
486         struct dentry *new;
487         nid_t ino = -1;
488         int err = 0;
489         unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
490         struct f2fs_filename fname;
491
492         trace_f2fs_lookup_start(dir, dentry, flags);
493
494         if (dentry->d_name.len > F2FS_NAME_LEN) {
495                 err = -ENAMETOOLONG;
496                 goto out;
497         }
498
499         err = f2fs_prepare_lookup(dir, dentry, &fname);
500         generic_set_encrypted_ci_d_ops(dentry);
501         if (err == -ENOENT)
502                 goto out_splice;
503         if (err)
504                 goto out;
505         de = __f2fs_find_entry(dir, &fname, &page);
506         f2fs_free_filename(&fname);
507
508         if (!de) {
509                 if (IS_ERR(page)) {
510                         err = PTR_ERR(page);
511                         goto out;
512                 }
513                 err = -ENOENT;
514                 goto out_splice;
515         }
516
517         ino = le32_to_cpu(de->ino);
518         f2fs_put_page(page, 0);
519
520         inode = f2fs_iget(dir->i_sb, ino);
521         if (IS_ERR(inode)) {
522                 err = PTR_ERR(inode);
523                 goto out;
524         }
525
526         if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
527                 err = __recover_dot_dentries(dir, root_ino);
528                 if (err)
529                         goto out_iput;
530         }
531
532         if (f2fs_has_inline_dots(inode)) {
533                 err = __recover_dot_dentries(inode, dir->i_ino);
534                 if (err)
535                         goto out_iput;
536         }
537         if (IS_ENCRYPTED(dir) &&
538             (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
539             !fscrypt_has_permitted_context(dir, inode)) {
540                 f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu",
541                           dir->i_ino, inode->i_ino);
542                 err = -EPERM;
543                 goto out_iput;
544         }
545 out_splice:
546 #ifdef CONFIG_UNICODE
547         if (!inode && IS_CASEFOLDED(dir)) {
548                 /* Eventually we want to call d_add_ci(dentry, NULL)
549                  * for negative dentries in the encoding case as
550                  * well.  For now, prevent the negative dentry
551                  * from being cached.
552                  */
553                 trace_f2fs_lookup_end(dir, dentry, ino, err);
554                 return NULL;
555         }
556 #endif
557         new = d_splice_alias(inode, dentry);
558         err = PTR_ERR_OR_ZERO(new);
559         trace_f2fs_lookup_end(dir, dentry, ino, !new ? -ENOENT : err);
560         return new;
561 out_iput:
562         iput(inode);
563 out:
564         trace_f2fs_lookup_end(dir, dentry, ino, err);
565         return ERR_PTR(err);
566 }
567
568 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
569 {
570         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
571         struct inode *inode = d_inode(dentry);
572         struct f2fs_dir_entry *de;
573         struct page *page;
574         int err;
575
576         trace_f2fs_unlink_enter(dir, dentry);
577
578         if (unlikely(f2fs_cp_error(sbi))) {
579                 err = -EIO;
580                 goto fail;
581         }
582
583         err = dquot_initialize(dir);
584         if (err)
585                 goto fail;
586         err = dquot_initialize(inode);
587         if (err)
588                 goto fail;
589
590         de = f2fs_find_entry(dir, &dentry->d_name, &page);
591         if (!de) {
592                 if (IS_ERR(page))
593                         err = PTR_ERR(page);
594                 goto fail;
595         }
596
597         f2fs_balance_fs(sbi, true);
598
599         f2fs_lock_op(sbi);
600         err = f2fs_acquire_orphan_inode(sbi);
601         if (err) {
602                 f2fs_unlock_op(sbi);
603                 f2fs_put_page(page, 0);
604                 goto fail;
605         }
606         f2fs_delete_entry(de, page, dir, inode);
607 #ifdef CONFIG_UNICODE
608         /* VFS negative dentries are incompatible with Encoding and
609          * Case-insensitiveness. Eventually we'll want avoid
610          * invalidating the dentries here, alongside with returning the
611          * negative dentries at f2fs_lookup(), when it is better
612          * supported by the VFS for the CI case.
613          */
614         if (IS_CASEFOLDED(dir))
615                 d_invalidate(dentry);
616 #endif
617         f2fs_unlock_op(sbi);
618
619         if (IS_DIRSYNC(dir))
620                 f2fs_sync_fs(sbi->sb, 1);
621 fail:
622         trace_f2fs_unlink_exit(inode, err);
623         return err;
624 }
625
626 static const char *f2fs_get_link(struct dentry *dentry,
627                                  struct inode *inode,
628                                  struct delayed_call *done)
629 {
630         const char *link = page_get_link(dentry, inode, done);
631         if (!IS_ERR(link) && !*link) {
632                 /* this is broken symlink case */
633                 do_delayed_call(done);
634                 clear_delayed_call(done);
635                 link = ERR_PTR(-ENOENT);
636         }
637         return link;
638 }
639
640 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
641                                         const char *symname)
642 {
643         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
644         struct inode *inode;
645         size_t len = strlen(symname);
646         struct fscrypt_str disk_link;
647         int err;
648
649         if (unlikely(f2fs_cp_error(sbi)))
650                 return -EIO;
651         if (!f2fs_is_checkpoint_ready(sbi))
652                 return -ENOSPC;
653
654         err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
655                                       &disk_link);
656         if (err)
657                 return err;
658
659         err = dquot_initialize(dir);
660         if (err)
661                 return err;
662
663         inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
664         if (IS_ERR(inode))
665                 return PTR_ERR(inode);
666
667         if (IS_ENCRYPTED(inode))
668                 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
669         else
670                 inode->i_op = &f2fs_symlink_inode_operations;
671         inode_nohighmem(inode);
672         inode->i_mapping->a_ops = &f2fs_dblock_aops;
673
674         f2fs_lock_op(sbi);
675         err = f2fs_add_link(dentry, inode);
676         if (err)
677                 goto out_f2fs_handle_failed_inode;
678         f2fs_unlock_op(sbi);
679         f2fs_alloc_nid_done(sbi, inode->i_ino);
680
681         err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
682         if (err)
683                 goto err_out;
684
685         err = page_symlink(inode, disk_link.name, disk_link.len);
686
687 err_out:
688         d_instantiate_new(dentry, inode);
689
690         /*
691          * Let's flush symlink data in order to avoid broken symlink as much as
692          * possible. Nevertheless, fsyncing is the best way, but there is no
693          * way to get a file descriptor in order to flush that.
694          *
695          * Note that, it needs to do dir->fsync to make this recoverable.
696          * If the symlink path is stored into inline_data, there is no
697          * performance regression.
698          */
699         if (!err) {
700                 filemap_write_and_wait_range(inode->i_mapping, 0,
701                                                         disk_link.len - 1);
702
703                 if (IS_DIRSYNC(dir))
704                         f2fs_sync_fs(sbi->sb, 1);
705         } else {
706                 f2fs_unlink(dir, dentry);
707         }
708
709         f2fs_balance_fs(sbi, true);
710         goto out_free_encrypted_link;
711
712 out_f2fs_handle_failed_inode:
713         f2fs_handle_failed_inode(inode);
714 out_free_encrypted_link:
715         if (disk_link.name != (unsigned char *)symname)
716                 kfree(disk_link.name);
717         return err;
718 }
719
720 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
721 {
722         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
723         struct inode *inode;
724         int err;
725
726         if (unlikely(f2fs_cp_error(sbi)))
727                 return -EIO;
728
729         err = dquot_initialize(dir);
730         if (err)
731                 return err;
732
733         inode = f2fs_new_inode(dir, S_IFDIR | mode);
734         if (IS_ERR(inode))
735                 return PTR_ERR(inode);
736
737         inode->i_op = &f2fs_dir_inode_operations;
738         inode->i_fop = &f2fs_dir_operations;
739         inode->i_mapping->a_ops = &f2fs_dblock_aops;
740         inode_nohighmem(inode);
741
742         set_inode_flag(inode, FI_INC_LINK);
743         f2fs_lock_op(sbi);
744         err = f2fs_add_link(dentry, inode);
745         if (err)
746                 goto out_fail;
747         f2fs_unlock_op(sbi);
748
749         f2fs_alloc_nid_done(sbi, inode->i_ino);
750
751         d_instantiate_new(dentry, inode);
752
753         if (IS_DIRSYNC(dir))
754                 f2fs_sync_fs(sbi->sb, 1);
755
756         f2fs_balance_fs(sbi, true);
757         return 0;
758
759 out_fail:
760         clear_inode_flag(inode, FI_INC_LINK);
761         f2fs_handle_failed_inode(inode);
762         return err;
763 }
764
765 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
766 {
767         struct inode *inode = d_inode(dentry);
768         if (f2fs_empty_dir(inode))
769                 return f2fs_unlink(dir, dentry);
770         return -ENOTEMPTY;
771 }
772
773 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
774                                 umode_t mode, dev_t rdev)
775 {
776         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
777         struct inode *inode;
778         int err = 0;
779
780         if (unlikely(f2fs_cp_error(sbi)))
781                 return -EIO;
782         if (!f2fs_is_checkpoint_ready(sbi))
783                 return -ENOSPC;
784
785         err = dquot_initialize(dir);
786         if (err)
787                 return err;
788
789         inode = f2fs_new_inode(dir, mode);
790         if (IS_ERR(inode))
791                 return PTR_ERR(inode);
792
793         init_special_inode(inode, inode->i_mode, rdev);
794         inode->i_op = &f2fs_special_inode_operations;
795
796         f2fs_lock_op(sbi);
797         err = f2fs_add_link(dentry, inode);
798         if (err)
799                 goto out;
800         f2fs_unlock_op(sbi);
801
802         f2fs_alloc_nid_done(sbi, inode->i_ino);
803
804         d_instantiate_new(dentry, inode);
805
806         if (IS_DIRSYNC(dir))
807                 f2fs_sync_fs(sbi->sb, 1);
808
809         f2fs_balance_fs(sbi, true);
810         return 0;
811 out:
812         f2fs_handle_failed_inode(inode);
813         return err;
814 }
815
816 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
817                                         umode_t mode, struct inode **whiteout)
818 {
819         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
820         struct inode *inode;
821         int err;
822
823         err = dquot_initialize(dir);
824         if (err)
825                 return err;
826
827         inode = f2fs_new_inode(dir, mode);
828         if (IS_ERR(inode))
829                 return PTR_ERR(inode);
830
831         if (whiteout) {
832                 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
833                 inode->i_op = &f2fs_special_inode_operations;
834         } else {
835                 inode->i_op = &f2fs_file_inode_operations;
836                 inode->i_fop = &f2fs_file_operations;
837                 inode->i_mapping->a_ops = &f2fs_dblock_aops;
838         }
839
840         f2fs_lock_op(sbi);
841         err = f2fs_acquire_orphan_inode(sbi);
842         if (err)
843                 goto out;
844
845         err = f2fs_do_tmpfile(inode, dir);
846         if (err)
847                 goto release_out;
848
849         /*
850          * add this non-linked tmpfile to orphan list, in this way we could
851          * remove all unused data of tmpfile after abnormal power-off.
852          */
853         f2fs_add_orphan_inode(inode);
854         f2fs_alloc_nid_done(sbi, inode->i_ino);
855
856         if (whiteout) {
857                 f2fs_i_links_write(inode, false);
858                 inode->i_state |= I_LINKABLE;
859                 *whiteout = inode;
860         } else {
861                 d_tmpfile(dentry, inode);
862         }
863         /* link_count was changed by d_tmpfile as well. */
864         f2fs_unlock_op(sbi);
865         unlock_new_inode(inode);
866
867         f2fs_balance_fs(sbi, true);
868         return 0;
869
870 release_out:
871         f2fs_release_orphan_inode(sbi);
872 out:
873         f2fs_handle_failed_inode(inode);
874         return err;
875 }
876
877 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
878 {
879         struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
880
881         if (unlikely(f2fs_cp_error(sbi)))
882                 return -EIO;
883         if (!f2fs_is_checkpoint_ready(sbi))
884                 return -ENOSPC;
885
886         return __f2fs_tmpfile(dir, dentry, mode, NULL);
887 }
888
889 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
890 {
891         if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
892                 return -EIO;
893
894         return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
895 }
896
897 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
898                         struct inode *new_dir, struct dentry *new_dentry,
899                         unsigned int flags)
900 {
901         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
902         struct inode *old_inode = d_inode(old_dentry);
903         struct inode *new_inode = d_inode(new_dentry);
904         struct inode *whiteout = NULL;
905         struct page *old_dir_page = NULL;
906         struct page *old_page, *new_page = NULL;
907         struct f2fs_dir_entry *old_dir_entry = NULL;
908         struct f2fs_dir_entry *old_entry;
909         struct f2fs_dir_entry *new_entry;
910         int err;
911
912         if (unlikely(f2fs_cp_error(sbi)))
913                 return -EIO;
914         if (!f2fs_is_checkpoint_ready(sbi))
915                 return -ENOSPC;
916
917         if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
918                         (!projid_eq(F2FS_I(new_dir)->i_projid,
919                         F2FS_I(old_dentry->d_inode)->i_projid)))
920                 return -EXDEV;
921
922         /*
923          * If new_inode is null, the below renaming flow will
924          * add a link in old_dir which can conver inline_dir.
925          * After then, if we failed to get the entry due to other
926          * reasons like ENOMEM, we had to remove the new entry.
927          * Instead of adding such the error handling routine, let's
928          * simply convert first here.
929          */
930         if (old_dir == new_dir && !new_inode) {
931                 err = f2fs_try_convert_inline_dir(old_dir, new_dentry);
932                 if (err)
933                         return err;
934         }
935
936         if (flags & RENAME_WHITEOUT) {
937                 err = f2fs_create_whiteout(old_dir, &whiteout);
938                 if (err)
939                         return err;
940         }
941
942         err = dquot_initialize(old_dir);
943         if (err)
944                 goto out;
945
946         err = dquot_initialize(new_dir);
947         if (err)
948                 goto out;
949
950         if (new_inode) {
951                 err = dquot_initialize(new_inode);
952                 if (err)
953                         goto out;
954         }
955
956         err = -ENOENT;
957         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
958         if (!old_entry) {
959                 if (IS_ERR(old_page))
960                         err = PTR_ERR(old_page);
961                 goto out;
962         }
963
964         if (S_ISDIR(old_inode->i_mode)) {
965                 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
966                 if (!old_dir_entry) {
967                         if (IS_ERR(old_dir_page))
968                                 err = PTR_ERR(old_dir_page);
969                         goto out_old;
970                 }
971         }
972
973         if (new_inode) {
974
975                 err = -ENOTEMPTY;
976                 if (old_dir_entry && !f2fs_empty_dir(new_inode))
977                         goto out_dir;
978
979                 err = -ENOENT;
980                 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
981                                                 &new_page);
982                 if (!new_entry) {
983                         if (IS_ERR(new_page))
984                                 err = PTR_ERR(new_page);
985                         goto out_dir;
986                 }
987
988                 f2fs_balance_fs(sbi, true);
989
990                 f2fs_lock_op(sbi);
991
992                 err = f2fs_acquire_orphan_inode(sbi);
993                 if (err)
994                         goto put_out_dir;
995
996                 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
997                 new_page = NULL;
998
999                 new_inode->i_ctime = current_time(new_inode);
1000                 down_write(&F2FS_I(new_inode)->i_sem);
1001                 if (old_dir_entry)
1002                         f2fs_i_links_write(new_inode, false);
1003                 f2fs_i_links_write(new_inode, false);
1004                 up_write(&F2FS_I(new_inode)->i_sem);
1005
1006                 if (!new_inode->i_nlink)
1007                         f2fs_add_orphan_inode(new_inode);
1008                 else
1009                         f2fs_release_orphan_inode(sbi);
1010         } else {
1011                 f2fs_balance_fs(sbi, true);
1012
1013                 f2fs_lock_op(sbi);
1014
1015                 err = f2fs_add_link(new_dentry, old_inode);
1016                 if (err) {
1017                         f2fs_unlock_op(sbi);
1018                         goto out_dir;
1019                 }
1020
1021                 if (old_dir_entry)
1022                         f2fs_i_links_write(new_dir, true);
1023         }
1024
1025         down_write(&F2FS_I(old_inode)->i_sem);
1026         if (!old_dir_entry || whiteout)
1027                 file_lost_pino(old_inode);
1028         else
1029                 /* adjust dir's i_pino to pass fsck check */
1030                 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1031         up_write(&F2FS_I(old_inode)->i_sem);
1032
1033         old_inode->i_ctime = current_time(old_inode);
1034         f2fs_mark_inode_dirty_sync(old_inode, false);
1035
1036         f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
1037         old_page = NULL;
1038
1039         if (whiteout) {
1040                 set_inode_flag(whiteout, FI_INC_LINK);
1041                 err = f2fs_add_link(old_dentry, whiteout);
1042                 if (err)
1043                         goto put_out_dir;
1044                 whiteout->i_state &= ~I_LINKABLE;
1045                 iput(whiteout);
1046         }
1047
1048         if (old_dir_entry) {
1049                 if (old_dir != new_dir && !whiteout)
1050                         f2fs_set_link(old_inode, old_dir_entry,
1051                                                 old_dir_page, new_dir);
1052                 else
1053                         f2fs_put_page(old_dir_page, 0);
1054                 f2fs_i_links_write(old_dir, false);
1055         }
1056         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1057                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1058                 if (S_ISDIR(old_inode->i_mode))
1059                         f2fs_add_ino_entry(sbi, old_inode->i_ino,
1060                                                         TRANS_DIR_INO);
1061         }
1062
1063         f2fs_unlock_op(sbi);
1064
1065         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1066                 f2fs_sync_fs(sbi->sb, 1);
1067
1068         f2fs_update_time(sbi, REQ_TIME);
1069         return 0;
1070
1071 put_out_dir:
1072         f2fs_unlock_op(sbi);
1073         f2fs_put_page(new_page, 0);
1074 out_dir:
1075         if (old_dir_entry)
1076                 f2fs_put_page(old_dir_page, 0);
1077 out_old:
1078         f2fs_put_page(old_page, 0);
1079 out:
1080         if (whiteout)
1081                 iput(whiteout);
1082         return err;
1083 }
1084
1085 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1086                              struct inode *new_dir, struct dentry *new_dentry)
1087 {
1088         struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1089         struct inode *old_inode = d_inode(old_dentry);
1090         struct inode *new_inode = d_inode(new_dentry);
1091         struct page *old_dir_page, *new_dir_page;
1092         struct page *old_page, *new_page;
1093         struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1094         struct f2fs_dir_entry *old_entry, *new_entry;
1095         int old_nlink = 0, new_nlink = 0;
1096         int err;
1097
1098         if (unlikely(f2fs_cp_error(sbi)))
1099                 return -EIO;
1100         if (!f2fs_is_checkpoint_ready(sbi))
1101                 return -ENOSPC;
1102
1103         if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1104                         !projid_eq(F2FS_I(new_dir)->i_projid,
1105                         F2FS_I(old_dentry->d_inode)->i_projid)) ||
1106             (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1107                         !projid_eq(F2FS_I(old_dir)->i_projid,
1108                         F2FS_I(new_dentry->d_inode)->i_projid)))
1109                 return -EXDEV;
1110
1111         err = dquot_initialize(old_dir);
1112         if (err)
1113                 goto out;
1114
1115         err = dquot_initialize(new_dir);
1116         if (err)
1117                 goto out;
1118
1119         err = -ENOENT;
1120         old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1121         if (!old_entry) {
1122                 if (IS_ERR(old_page))
1123                         err = PTR_ERR(old_page);
1124                 goto out;
1125         }
1126
1127         new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1128         if (!new_entry) {
1129                 if (IS_ERR(new_page))
1130                         err = PTR_ERR(new_page);
1131                 goto out_old;
1132         }
1133
1134         /* prepare for updating ".." directory entry info later */
1135         if (old_dir != new_dir) {
1136                 if (S_ISDIR(old_inode->i_mode)) {
1137                         old_dir_entry = f2fs_parent_dir(old_inode,
1138                                                         &old_dir_page);
1139                         if (!old_dir_entry) {
1140                                 if (IS_ERR(old_dir_page))
1141                                         err = PTR_ERR(old_dir_page);
1142                                 goto out_new;
1143                         }
1144                 }
1145
1146                 if (S_ISDIR(new_inode->i_mode)) {
1147                         new_dir_entry = f2fs_parent_dir(new_inode,
1148                                                         &new_dir_page);
1149                         if (!new_dir_entry) {
1150                                 if (IS_ERR(new_dir_page))
1151                                         err = PTR_ERR(new_dir_page);
1152                                 goto out_old_dir;
1153                         }
1154                 }
1155         }
1156
1157         /*
1158          * If cross rename between file and directory those are not
1159          * in the same directory, we will inc nlink of file's parent
1160          * later, so we should check upper boundary of its nlink.
1161          */
1162         if ((!old_dir_entry || !new_dir_entry) &&
1163                                 old_dir_entry != new_dir_entry) {
1164                 old_nlink = old_dir_entry ? -1 : 1;
1165                 new_nlink = -old_nlink;
1166                 err = -EMLINK;
1167                 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1168                         (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1169                         goto out_new_dir;
1170         }
1171
1172         f2fs_balance_fs(sbi, true);
1173
1174         f2fs_lock_op(sbi);
1175
1176         /* update ".." directory entry info of old dentry */
1177         if (old_dir_entry)
1178                 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1179
1180         /* update ".." directory entry info of new dentry */
1181         if (new_dir_entry)
1182                 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1183
1184         /* update directory entry info of old dir inode */
1185         f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1186
1187         down_write(&F2FS_I(old_inode)->i_sem);
1188         if (!old_dir_entry)
1189                 file_lost_pino(old_inode);
1190         else
1191                 /* adjust dir's i_pino to pass fsck check */
1192                 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1193         up_write(&F2FS_I(old_inode)->i_sem);
1194
1195         old_dir->i_ctime = current_time(old_dir);
1196         if (old_nlink) {
1197                 down_write(&F2FS_I(old_dir)->i_sem);
1198                 f2fs_i_links_write(old_dir, old_nlink > 0);
1199                 up_write(&F2FS_I(old_dir)->i_sem);
1200         }
1201         f2fs_mark_inode_dirty_sync(old_dir, false);
1202
1203         /* update directory entry info of new dir inode */
1204         f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1205
1206         down_write(&F2FS_I(new_inode)->i_sem);
1207         if (!new_dir_entry)
1208                 file_lost_pino(new_inode);
1209         else
1210                 /* adjust dir's i_pino to pass fsck check */
1211                 f2fs_i_pino_write(new_inode, old_dir->i_ino);
1212         up_write(&F2FS_I(new_inode)->i_sem);
1213
1214         new_dir->i_ctime = current_time(new_dir);
1215         if (new_nlink) {
1216                 down_write(&F2FS_I(new_dir)->i_sem);
1217                 f2fs_i_links_write(new_dir, new_nlink > 0);
1218                 up_write(&F2FS_I(new_dir)->i_sem);
1219         }
1220         f2fs_mark_inode_dirty_sync(new_dir, false);
1221
1222         if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1223                 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1224                 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1225         }
1226
1227         f2fs_unlock_op(sbi);
1228
1229         if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1230                 f2fs_sync_fs(sbi->sb, 1);
1231
1232         f2fs_update_time(sbi, REQ_TIME);
1233         return 0;
1234 out_new_dir:
1235         if (new_dir_entry) {
1236                 f2fs_put_page(new_dir_page, 0);
1237         }
1238 out_old_dir:
1239         if (old_dir_entry) {
1240                 f2fs_put_page(old_dir_page, 0);
1241         }
1242 out_new:
1243         f2fs_put_page(new_page, 0);
1244 out_old:
1245         f2fs_put_page(old_page, 0);
1246 out:
1247         return err;
1248 }
1249
1250 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1251                         struct inode *new_dir, struct dentry *new_dentry,
1252                         unsigned int flags)
1253 {
1254         int err;
1255
1256         if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1257                 return -EINVAL;
1258
1259         err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1260                                      flags);
1261         if (err)
1262                 return err;
1263
1264         if (flags & RENAME_EXCHANGE) {
1265                 return f2fs_cross_rename(old_dir, old_dentry,
1266                                          new_dir, new_dentry);
1267         }
1268         /*
1269          * VFS has already handled the new dentry existence case,
1270          * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1271          */
1272         return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1273 }
1274
1275 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1276                                            struct inode *inode,
1277                                            struct delayed_call *done)
1278 {
1279         struct page *page;
1280         const char *target;
1281
1282         if (!dentry)
1283                 return ERR_PTR(-ECHILD);
1284
1285         page = read_mapping_page(inode->i_mapping, 0, NULL);
1286         if (IS_ERR(page))
1287                 return ERR_CAST(page);
1288
1289         target = fscrypt_get_symlink(inode, page_address(page),
1290                                      inode->i_sb->s_blocksize, done);
1291         put_page(page);
1292         return target;
1293 }
1294
1295 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1296         .get_link       = f2fs_encrypted_get_link,
1297         .getattr        = f2fs_getattr,
1298         .setattr        = f2fs_setattr,
1299         .listxattr      = f2fs_listxattr,
1300 };
1301
1302 const struct inode_operations f2fs_dir_inode_operations = {
1303         .create         = f2fs_create,
1304         .lookup         = f2fs_lookup,
1305         .link           = f2fs_link,
1306         .unlink         = f2fs_unlink,
1307         .symlink        = f2fs_symlink,
1308         .mkdir          = f2fs_mkdir,
1309         .rmdir          = f2fs_rmdir,
1310         .mknod          = f2fs_mknod,
1311         .rename         = f2fs_rename2,
1312         .tmpfile        = f2fs_tmpfile,
1313         .getattr        = f2fs_getattr,
1314         .setattr        = f2fs_setattr,
1315         .get_acl        = f2fs_get_acl,
1316         .set_acl        = f2fs_set_acl,
1317         .listxattr      = f2fs_listxattr,
1318         .fiemap         = f2fs_fiemap,
1319 };
1320
1321 const struct inode_operations f2fs_symlink_inode_operations = {
1322         .get_link       = f2fs_get_link,
1323         .getattr        = f2fs_getattr,
1324         .setattr        = f2fs_setattr,
1325         .listxattr      = f2fs_listxattr,
1326 };
1327
1328 const struct inode_operations f2fs_special_inode_operations = {
1329         .getattr        = f2fs_getattr,
1330         .setattr        = f2fs_setattr,
1331         .get_acl        = f2fs_get_acl,
1332         .set_acl        = f2fs_set_acl,
1333         .listxattr      = f2fs_listxattr,
1334 };