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1 /*
2 * fs/f2fs/namei.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11 #include <linux/fs.h>
12 #include <linux/f2fs_fs.h>
13 #include <linux/pagemap.h>
14 #include <linux/sched.h>
15 #include <linux/ctype.h>
16 #include <linux/dcache.h>
17 #include <linux/namei.h>
18 #include <linux/quotaops.h>
19
20 #include "f2fs.h"
21 #include "node.h"
22 #include "xattr.h"
23 #include "acl.h"
24 #include <trace/events/f2fs.h>
25
26 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
27 {
28 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
29 nid_t ino;
30 struct inode *inode;
31 bool nid_free = false;
32 int xattr_size = 0;
33 int err;
34
35 inode = new_inode(dir->i_sb);
36 if (!inode)
37 return ERR_PTR(-ENOMEM);
38
39 f2fs_lock_op(sbi);
40 if (!alloc_nid(sbi, &ino)) {
41 f2fs_unlock_op(sbi);
42 err = -ENOSPC;
43 goto fail;
44 }
45 f2fs_unlock_op(sbi);
46
47 nid_free = true;
48
49 inode_init_owner(inode, dir, mode);
50
51 inode->i_ino = ino;
52 inode->i_blocks = 0;
53 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
54 inode->i_generation = sbi->s_next_generation++;
55
56 err = insert_inode_locked(inode);
57 if (err) {
58 err = -EINVAL;
59 goto fail;
60 }
61
62 if (f2fs_sb_has_project_quota(sbi->sb) &&
63 (F2FS_I(dir)->i_flags & FS_PROJINHERIT_FL))
64 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
65 else
66 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
67 F2FS_DEF_PROJID);
68
69 err = dquot_initialize(inode);
70 if (err)
71 goto fail_drop;
72
73 err = dquot_alloc_inode(inode);
74 if (err)
75 goto fail_drop;
76
77 /* If the directory encrypted, then we should encrypt the inode. */
78 if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
79 f2fs_set_encrypted_inode(inode);
80
81 set_inode_flag(inode, FI_NEW_INODE);
82
83 if (f2fs_sb_has_extra_attr(sbi->sb)) {
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->sb)) {
97 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
98 if (f2fs_has_inline_xattr(inode))
99 xattr_size = 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 |= FS_INDEX_FL;
118
119 if (F2FS_I(inode)->i_flags & FS_PROJINHERIT_FL)
120 set_inode_flag(inode, FI_PROJ_INHERIT);
121
122 trace_f2fs_new_inode(inode, 0);
123 return inode;
124
125 fail:
126 trace_f2fs_new_inode(inode, err);
127 make_bad_inode(inode);
128 if (nid_free)
129 set_inode_flag(inode, FI_FREE_NID);
130 iput(inode);
131 return ERR_PTR(err);
132 fail_drop:
133 trace_f2fs_new_inode(inode, err);
134 dquot_drop(inode);
135 inode->i_flags |= S_NOQUOTA;
136 if (nid_free)
137 set_inode_flag(inode, FI_FREE_NID);
138 clear_nlink(inode);
139 unlock_new_inode(inode);
140 iput(inode);
141 return ERR_PTR(err);
142 }
143
144 static int is_multimedia_file(const unsigned char *s, const char *sub)
145 {
146 size_t slen = strlen(s);
147 size_t sublen = strlen(sub);
148 int i;
149
150 /*
151 * filename format of multimedia file should be defined as:
152 * "filename + '.' + extension + (optional: '.' + temp extension)".
153 */
154 if (slen < sublen + 2)
155 return 0;
156
157 for (i = 1; i < slen - sublen; i++) {
158 if (s[i] != '.')
159 continue;
160 if (!strncasecmp(s + i + 1, sub, sublen))
161 return 1;
162 }
163
164 return 0;
165 }
166
167 /*
168 * Set multimedia files as cold files for hot/cold data separation
169 */
170 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
171 const unsigned char *name)
172 {
173 int i;
174 __u8 (*extlist)[8] = sbi->raw_super->extension_list;
175
176 int count = le32_to_cpu(sbi->raw_super->extension_count);
177 for (i = 0; i < count; i++) {
178 if (is_multimedia_file(name, extlist[i])) {
179 file_set_cold(inode);
180 break;
181 }
182 }
183 }
184
185 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
186 bool excl)
187 {
188 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
189 struct inode *inode;
190 nid_t ino = 0;
191 int err;
192
193 if (unlikely(f2fs_cp_error(sbi)))
194 return -EIO;
195
196 err = dquot_initialize(dir);
197 if (err)
198 return err;
199
200 inode = f2fs_new_inode(dir, mode);
201 if (IS_ERR(inode))
202 return PTR_ERR(inode);
203
204 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
205 set_cold_files(sbi, inode, dentry->d_name.name);
206
207 inode->i_op = &f2fs_file_inode_operations;
208 inode->i_fop = &f2fs_file_operations;
209 inode->i_mapping->a_ops = &f2fs_dblock_aops;
210 ino = inode->i_ino;
211
212 f2fs_lock_op(sbi);
213 err = f2fs_add_link(dentry, inode);
214 if (err)
215 goto out;
216 f2fs_unlock_op(sbi);
217
218 alloc_nid_done(sbi, ino);
219
220 d_instantiate_new(dentry, inode);
221
222 if (IS_DIRSYNC(dir))
223 f2fs_sync_fs(sbi->sb, 1);
224
225 f2fs_balance_fs(sbi, true);
226 return 0;
227 out:
228 handle_failed_inode(inode);
229 return err;
230 }
231
232 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
233 struct dentry *dentry)
234 {
235 struct inode *inode = d_inode(old_dentry);
236 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
237 int err;
238
239 if (unlikely(f2fs_cp_error(sbi)))
240 return -EIO;
241
242 if (f2fs_encrypted_inode(dir) &&
243 !fscrypt_has_permitted_context(dir, inode))
244 return -EPERM;
245
246 if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
247 (!projid_eq(F2FS_I(dir)->i_projid,
248 F2FS_I(old_dentry->d_inode)->i_projid)))
249 return -EXDEV;
250
251 err = dquot_initialize(dir);
252 if (err)
253 return err;
254
255 f2fs_balance_fs(sbi, true);
256
257 inode->i_ctime = current_time(inode);
258 ihold(inode);
259
260 set_inode_flag(inode, FI_INC_LINK);
261 f2fs_lock_op(sbi);
262 err = f2fs_add_link(dentry, inode);
263 if (err)
264 goto out;
265 f2fs_unlock_op(sbi);
266
267 d_instantiate(dentry, inode);
268
269 if (IS_DIRSYNC(dir))
270 f2fs_sync_fs(sbi->sb, 1);
271 return 0;
272 out:
273 clear_inode_flag(inode, FI_INC_LINK);
274 iput(inode);
275 f2fs_unlock_op(sbi);
276 return err;
277 }
278
279 struct dentry *f2fs_get_parent(struct dentry *child)
280 {
281 struct qstr dotdot = QSTR_INIT("..", 2);
282 struct page *page;
283 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
284 if (!ino) {
285 if (IS_ERR(page))
286 return ERR_CAST(page);
287 return ERR_PTR(-ENOENT);
288 }
289 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
290 }
291
292 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
293 {
294 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
295 struct qstr dot = QSTR_INIT(".", 1);
296 struct qstr dotdot = QSTR_INIT("..", 2);
297 struct f2fs_dir_entry *de;
298 struct page *page;
299 int err = 0;
300
301 if (f2fs_readonly(sbi->sb)) {
302 f2fs_msg(sbi->sb, KERN_INFO,
303 "skip recovering inline_dots inode (ino:%lu, pino:%u) "
304 "in readonly mountpoint", dir->i_ino, pino);
305 return 0;
306 }
307
308 err = dquot_initialize(dir);
309 if (err)
310 return err;
311
312 f2fs_balance_fs(sbi, true);
313
314 f2fs_lock_op(sbi);
315
316 de = f2fs_find_entry(dir, &dot, &page);
317 if (de) {
318 f2fs_dentry_kunmap(dir, page);
319 f2fs_put_page(page, 0);
320 } else if (IS_ERR(page)) {
321 err = PTR_ERR(page);
322 goto out;
323 } else {
324 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
325 if (err)
326 goto out;
327 }
328
329 de = f2fs_find_entry(dir, &dotdot, &page);
330 if (de) {
331 f2fs_dentry_kunmap(dir, page);
332 f2fs_put_page(page, 0);
333 } else if (IS_ERR(page)) {
334 err = PTR_ERR(page);
335 } else {
336 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
337 }
338 out:
339 if (!err)
340 clear_inode_flag(dir, FI_INLINE_DOTS);
341
342 f2fs_unlock_op(sbi);
343 return err;
344 }
345
346 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
347 unsigned int flags)
348 {
349 struct inode *inode = NULL;
350 struct f2fs_dir_entry *de;
351 struct page *page;
352 struct dentry *new;
353 nid_t ino = -1;
354 int err = 0;
355 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
356
357 trace_f2fs_lookup_start(dir, dentry, flags);
358
359 if (f2fs_encrypted_inode(dir)) {
360 err = fscrypt_get_encryption_info(dir);
361
362 /*
363 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
364 * created while the directory was encrypted and we
365 * don't have access to the key.
366 */
367 if (fscrypt_has_encryption_key(dir))
368 fscrypt_set_encrypted_dentry(dentry);
369 fscrypt_set_d_op(dentry);
370 if (err && err != -ENOKEY)
371 goto out;
372 }
373
374 if (dentry->d_name.len > F2FS_NAME_LEN) {
375 err = -ENAMETOOLONG;
376 goto out;
377 }
378
379 de = f2fs_find_entry(dir, &dentry->d_name, &page);
380 if (!de) {
381 if (IS_ERR(page)) {
382 err = PTR_ERR(page);
383 goto out;
384 }
385 goto out_splice;
386 }
387
388 ino = le32_to_cpu(de->ino);
389 f2fs_dentry_kunmap(dir, page);
390 f2fs_put_page(page, 0);
391
392 inode = f2fs_iget(dir->i_sb, ino);
393 if (IS_ERR(inode)) {
394 err = PTR_ERR(inode);
395 goto out;
396 }
397
398 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
399 err = __recover_dot_dentries(dir, root_ino);
400 if (err)
401 goto out_iput;
402 }
403
404 if (f2fs_has_inline_dots(inode)) {
405 err = __recover_dot_dentries(inode, dir->i_ino);
406 if (err)
407 goto out_iput;
408 }
409 if (f2fs_encrypted_inode(dir) &&
410 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
411 !fscrypt_has_permitted_context(dir, inode)) {
412 f2fs_msg(inode->i_sb, KERN_WARNING,
413 "Inconsistent encryption contexts: %lu/%lu",
414 dir->i_ino, inode->i_ino);
415 err = -EPERM;
416 goto out_iput;
417 }
418 out_splice:
419 new = d_splice_alias(inode, dentry);
420 if (IS_ERR(new))
421 err = PTR_ERR(new);
422 trace_f2fs_lookup_end(dir, dentry, ino, err);
423 return new;
424 out_iput:
425 iput(inode);
426 out:
427 trace_f2fs_lookup_end(dir, dentry, ino, err);
428 return ERR_PTR(err);
429 }
430
431 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
432 {
433 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
434 struct inode *inode = d_inode(dentry);
435 struct f2fs_dir_entry *de;
436 struct page *page;
437 int err = -ENOENT;
438
439 trace_f2fs_unlink_enter(dir, dentry);
440
441 if (unlikely(f2fs_cp_error(sbi)))
442 return -EIO;
443
444 err = dquot_initialize(dir);
445 if (err)
446 return err;
447 err = dquot_initialize(inode);
448 if (err)
449 return err;
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 fail;
456 }
457
458 f2fs_balance_fs(sbi, true);
459
460 f2fs_lock_op(sbi);
461 err = acquire_orphan_inode(sbi);
462 if (err) {
463 f2fs_unlock_op(sbi);
464 f2fs_dentry_kunmap(dir, page);
465 f2fs_put_page(page, 0);
466 goto fail;
467 }
468 f2fs_delete_entry(de, page, dir, inode);
469 f2fs_unlock_op(sbi);
470
471 if (IS_DIRSYNC(dir))
472 f2fs_sync_fs(sbi->sb, 1);
473 fail:
474 trace_f2fs_unlink_exit(inode, err);
475 return err;
476 }
477
478 static const char *f2fs_get_link(struct dentry *dentry,
479 struct inode *inode,
480 struct delayed_call *done)
481 {
482 const char *link = page_get_link(dentry, inode, done);
483 if (!IS_ERR(link) && !*link) {
484 /* this is broken symlink case */
485 do_delayed_call(done);
486 clear_delayed_call(done);
487 link = ERR_PTR(-ENOENT);
488 }
489 return link;
490 }
491
492 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
493 const char *symname)
494 {
495 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
496 struct inode *inode;
497 size_t len = strlen(symname);
498 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
499 struct fscrypt_symlink_data *sd = NULL;
500 int err;
501
502 if (unlikely(f2fs_cp_error(sbi)))
503 return -EIO;
504
505 if (f2fs_encrypted_inode(dir)) {
506 err = fscrypt_get_encryption_info(dir);
507 if (err)
508 return err;
509
510 if (!fscrypt_has_encryption_key(dir))
511 return -ENOKEY;
512
513 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
514 sizeof(struct fscrypt_symlink_data));
515 }
516
517 if (disk_link.len > dir->i_sb->s_blocksize)
518 return -ENAMETOOLONG;
519
520 err = dquot_initialize(dir);
521 if (err)
522 return err;
523
524 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
525 if (IS_ERR(inode))
526 return PTR_ERR(inode);
527
528 if (f2fs_encrypted_inode(inode))
529 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
530 else
531 inode->i_op = &f2fs_symlink_inode_operations;
532 inode_nohighmem(inode);
533 inode->i_mapping->a_ops = &f2fs_dblock_aops;
534
535 f2fs_lock_op(sbi);
536 err = f2fs_add_link(dentry, inode);
537 if (err)
538 goto out;
539 f2fs_unlock_op(sbi);
540 alloc_nid_done(sbi, inode->i_ino);
541
542 if (f2fs_encrypted_inode(inode)) {
543 struct qstr istr = QSTR_INIT(symname, len);
544 struct fscrypt_str ostr;
545
546 sd = kzalloc(disk_link.len, GFP_NOFS);
547 if (!sd) {
548 err = -ENOMEM;
549 goto err_out;
550 }
551
552 err = fscrypt_get_encryption_info(inode);
553 if (err)
554 goto err_out;
555
556 if (!fscrypt_has_encryption_key(inode)) {
557 err = -ENOKEY;
558 goto err_out;
559 }
560
561 ostr.name = sd->encrypted_path;
562 ostr.len = disk_link.len;
563 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
564 if (err)
565 goto err_out;
566
567 sd->len = cpu_to_le16(ostr.len);
568 disk_link.name = (char *)sd;
569 }
570
571 err = page_symlink(inode, disk_link.name, disk_link.len);
572
573 err_out:
574 d_instantiate_new(dentry, inode);
575
576 /*
577 * Let's flush symlink data in order to avoid broken symlink as much as
578 * possible. Nevertheless, fsyncing is the best way, but there is no
579 * way to get a file descriptor in order to flush that.
580 *
581 * Note that, it needs to do dir->fsync to make this recoverable.
582 * If the symlink path is stored into inline_data, there is no
583 * performance regression.
584 */
585 if (!err) {
586 filemap_write_and_wait_range(inode->i_mapping, 0,
587 disk_link.len - 1);
588
589 if (IS_DIRSYNC(dir))
590 f2fs_sync_fs(sbi->sb, 1);
591 } else {
592 f2fs_unlink(dir, dentry);
593 }
594
595 kfree(sd);
596
597 f2fs_balance_fs(sbi, true);
598 return err;
599 out:
600 handle_failed_inode(inode);
601 return err;
602 }
603
604 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
605 {
606 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
607 struct inode *inode;
608 int err;
609
610 if (unlikely(f2fs_cp_error(sbi)))
611 return -EIO;
612
613 err = dquot_initialize(dir);
614 if (err)
615 return err;
616
617 inode = f2fs_new_inode(dir, S_IFDIR | mode);
618 if (IS_ERR(inode))
619 return PTR_ERR(inode);
620
621 inode->i_op = &f2fs_dir_inode_operations;
622 inode->i_fop = &f2fs_dir_operations;
623 inode->i_mapping->a_ops = &f2fs_dblock_aops;
624 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
625
626 set_inode_flag(inode, FI_INC_LINK);
627 f2fs_lock_op(sbi);
628 err = f2fs_add_link(dentry, inode);
629 if (err)
630 goto out_fail;
631 f2fs_unlock_op(sbi);
632
633 alloc_nid_done(sbi, inode->i_ino);
634
635 d_instantiate_new(dentry, inode);
636
637 if (IS_DIRSYNC(dir))
638 f2fs_sync_fs(sbi->sb, 1);
639
640 f2fs_balance_fs(sbi, true);
641 return 0;
642
643 out_fail:
644 clear_inode_flag(inode, FI_INC_LINK);
645 handle_failed_inode(inode);
646 return err;
647 }
648
649 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
650 {
651 struct inode *inode = d_inode(dentry);
652 if (f2fs_empty_dir(inode))
653 return f2fs_unlink(dir, dentry);
654 return -ENOTEMPTY;
655 }
656
657 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
658 umode_t mode, dev_t rdev)
659 {
660 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
661 struct inode *inode;
662 int err = 0;
663
664 if (unlikely(f2fs_cp_error(sbi)))
665 return -EIO;
666
667 err = dquot_initialize(dir);
668 if (err)
669 return err;
670
671 inode = f2fs_new_inode(dir, mode);
672 if (IS_ERR(inode))
673 return PTR_ERR(inode);
674
675 init_special_inode(inode, inode->i_mode, rdev);
676 inode->i_op = &f2fs_special_inode_operations;
677
678 f2fs_lock_op(sbi);
679 err = f2fs_add_link(dentry, inode);
680 if (err)
681 goto out;
682 f2fs_unlock_op(sbi);
683
684 alloc_nid_done(sbi, inode->i_ino);
685
686 d_instantiate_new(dentry, inode);
687
688 if (IS_DIRSYNC(dir))
689 f2fs_sync_fs(sbi->sb, 1);
690
691 f2fs_balance_fs(sbi, true);
692 return 0;
693 out:
694 handle_failed_inode(inode);
695 return err;
696 }
697
698 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
699 umode_t mode, struct inode **whiteout)
700 {
701 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
702 struct inode *inode;
703 int err;
704
705 err = dquot_initialize(dir);
706 if (err)
707 return err;
708
709 inode = f2fs_new_inode(dir, mode);
710 if (IS_ERR(inode))
711 return PTR_ERR(inode);
712
713 if (whiteout) {
714 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
715 inode->i_op = &f2fs_special_inode_operations;
716 } else {
717 inode->i_op = &f2fs_file_inode_operations;
718 inode->i_fop = &f2fs_file_operations;
719 inode->i_mapping->a_ops = &f2fs_dblock_aops;
720 }
721
722 f2fs_lock_op(sbi);
723 err = acquire_orphan_inode(sbi);
724 if (err)
725 goto out;
726
727 err = f2fs_do_tmpfile(inode, dir);
728 if (err)
729 goto release_out;
730
731 /*
732 * add this non-linked tmpfile to orphan list, in this way we could
733 * remove all unused data of tmpfile after abnormal power-off.
734 */
735 add_orphan_inode(inode);
736 alloc_nid_done(sbi, inode->i_ino);
737
738 if (whiteout) {
739 f2fs_i_links_write(inode, false);
740 *whiteout = inode;
741 } else {
742 d_tmpfile(dentry, inode);
743 }
744 /* link_count was changed by d_tmpfile as well. */
745 f2fs_unlock_op(sbi);
746 unlock_new_inode(inode);
747
748 f2fs_balance_fs(sbi, true);
749 return 0;
750
751 release_out:
752 release_orphan_inode(sbi);
753 out:
754 handle_failed_inode(inode);
755 return err;
756 }
757
758 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
759 {
760 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
761 return -EIO;
762
763 if (f2fs_encrypted_inode(dir)) {
764 int err = fscrypt_get_encryption_info(dir);
765 if (err)
766 return err;
767 }
768
769 return __f2fs_tmpfile(dir, dentry, mode, NULL);
770 }
771
772 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
773 {
774 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
775 return -EIO;
776
777 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
778 }
779
780 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
781 struct inode *new_dir, struct dentry *new_dentry,
782 unsigned int flags)
783 {
784 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
785 struct inode *old_inode = d_inode(old_dentry);
786 struct inode *new_inode = d_inode(new_dentry);
787 struct inode *whiteout = NULL;
788 struct page *old_dir_page;
789 struct page *old_page, *new_page = NULL;
790 struct f2fs_dir_entry *old_dir_entry = NULL;
791 struct f2fs_dir_entry *old_entry;
792 struct f2fs_dir_entry *new_entry;
793 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
794 int err = -ENOENT;
795
796 if (unlikely(f2fs_cp_error(sbi)))
797 return -EIO;
798
799 if ((f2fs_encrypted_inode(old_dir) &&
800 !fscrypt_has_encryption_key(old_dir)) ||
801 (f2fs_encrypted_inode(new_dir) &&
802 !fscrypt_has_encryption_key(new_dir)))
803 return -ENOKEY;
804
805 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
806 !fscrypt_has_permitted_context(new_dir, old_inode)) {
807 err = -EPERM;
808 goto out;
809 }
810
811 if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
812 (!projid_eq(F2FS_I(new_dir)->i_projid,
813 F2FS_I(old_dentry->d_inode)->i_projid)))
814 return -EXDEV;
815
816 err = dquot_initialize(old_dir);
817 if (err)
818 goto out;
819
820 err = dquot_initialize(new_dir);
821 if (err)
822 goto out;
823
824 if (new_inode) {
825 err = dquot_initialize(new_inode);
826 if (err)
827 goto out;
828 }
829
830 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
831 if (!old_entry) {
832 if (IS_ERR(old_page))
833 err = PTR_ERR(old_page);
834 goto out;
835 }
836
837 if (S_ISDIR(old_inode->i_mode)) {
838 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
839 if (!old_dir_entry) {
840 if (IS_ERR(old_dir_page))
841 err = PTR_ERR(old_dir_page);
842 goto out_old;
843 }
844 }
845
846 if (flags & RENAME_WHITEOUT) {
847 err = f2fs_create_whiteout(old_dir, &whiteout);
848 if (err)
849 goto out_dir;
850 }
851
852 if (new_inode) {
853
854 err = -ENOTEMPTY;
855 if (old_dir_entry && !f2fs_empty_dir(new_inode))
856 goto out_whiteout;
857
858 err = -ENOENT;
859 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
860 &new_page);
861 if (!new_entry) {
862 if (IS_ERR(new_page))
863 err = PTR_ERR(new_page);
864 goto out_whiteout;
865 }
866
867 f2fs_balance_fs(sbi, true);
868
869 f2fs_lock_op(sbi);
870
871 err = acquire_orphan_inode(sbi);
872 if (err)
873 goto put_out_dir;
874
875 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
876
877 new_inode->i_ctime = current_time(new_inode);
878 down_write(&F2FS_I(new_inode)->i_sem);
879 if (old_dir_entry)
880 f2fs_i_links_write(new_inode, false);
881 f2fs_i_links_write(new_inode, false);
882 up_write(&F2FS_I(new_inode)->i_sem);
883
884 if (!new_inode->i_nlink)
885 add_orphan_inode(new_inode);
886 else
887 release_orphan_inode(sbi);
888 } else {
889 f2fs_balance_fs(sbi, true);
890
891 f2fs_lock_op(sbi);
892
893 err = f2fs_add_link(new_dentry, old_inode);
894 if (err) {
895 f2fs_unlock_op(sbi);
896 goto out_whiteout;
897 }
898
899 if (old_dir_entry)
900 f2fs_i_links_write(new_dir, true);
901
902 /*
903 * old entry and new entry can locate in the same inline
904 * dentry in inode, when attaching new entry in inline dentry,
905 * it could force inline dentry conversion, after that,
906 * old_entry and old_page will point to wrong address, in
907 * order to avoid this, let's do the check and update here.
908 */
909 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
910 f2fs_put_page(old_page, 0);
911 old_page = NULL;
912
913 old_entry = f2fs_find_entry(old_dir,
914 &old_dentry->d_name, &old_page);
915 if (!old_entry) {
916 err = -ENOENT;
917 if (IS_ERR(old_page))
918 err = PTR_ERR(old_page);
919 f2fs_unlock_op(sbi);
920 goto out_whiteout;
921 }
922 }
923 }
924
925 down_write(&F2FS_I(old_inode)->i_sem);
926 if (!old_dir_entry || whiteout)
927 file_lost_pino(old_inode);
928 else
929 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
930 up_write(&F2FS_I(old_inode)->i_sem);
931
932 old_inode->i_ctime = current_time(old_inode);
933 f2fs_mark_inode_dirty_sync(old_inode, false);
934
935 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
936
937 if (whiteout) {
938 whiteout->i_state |= I_LINKABLE;
939 set_inode_flag(whiteout, FI_INC_LINK);
940 err = f2fs_add_link(old_dentry, whiteout);
941 if (err)
942 goto put_out_dir;
943 whiteout->i_state &= ~I_LINKABLE;
944 iput(whiteout);
945 }
946
947 if (old_dir_entry) {
948 if (old_dir != new_dir && !whiteout) {
949 f2fs_set_link(old_inode, old_dir_entry,
950 old_dir_page, new_dir);
951 } else {
952 f2fs_dentry_kunmap(old_inode, old_dir_page);
953 f2fs_put_page(old_dir_page, 0);
954 }
955 f2fs_i_links_write(old_dir, false);
956 }
957
958 f2fs_unlock_op(sbi);
959
960 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
961 f2fs_sync_fs(sbi->sb, 1);
962 return 0;
963
964 put_out_dir:
965 f2fs_unlock_op(sbi);
966 if (new_page) {
967 f2fs_dentry_kunmap(new_dir, new_page);
968 f2fs_put_page(new_page, 0);
969 }
970 out_whiteout:
971 if (whiteout)
972 iput(whiteout);
973 out_dir:
974 if (old_dir_entry) {
975 f2fs_dentry_kunmap(old_inode, old_dir_page);
976 f2fs_put_page(old_dir_page, 0);
977 }
978 out_old:
979 f2fs_dentry_kunmap(old_dir, old_page);
980 f2fs_put_page(old_page, 0);
981 out:
982 return err;
983 }
984
985 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
986 struct inode *new_dir, struct dentry *new_dentry)
987 {
988 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
989 struct inode *old_inode = d_inode(old_dentry);
990 struct inode *new_inode = d_inode(new_dentry);
991 struct page *old_dir_page, *new_dir_page;
992 struct page *old_page, *new_page;
993 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
994 struct f2fs_dir_entry *old_entry, *new_entry;
995 int old_nlink = 0, new_nlink = 0;
996 int err = -ENOENT;
997
998 if (unlikely(f2fs_cp_error(sbi)))
999 return -EIO;
1000
1001 if ((f2fs_encrypted_inode(old_dir) &&
1002 !fscrypt_has_encryption_key(old_dir)) ||
1003 (f2fs_encrypted_inode(new_dir) &&
1004 !fscrypt_has_encryption_key(new_dir)))
1005 return -ENOKEY;
1006
1007 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
1008 (old_dir != new_dir) &&
1009 (!fscrypt_has_permitted_context(new_dir, old_inode) ||
1010 !fscrypt_has_permitted_context(old_dir, new_inode)))
1011 return -EPERM;
1012
1013 if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1014 !projid_eq(F2FS_I(new_dir)->i_projid,
1015 F2FS_I(old_dentry->d_inode)->i_projid)) ||
1016 (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1017 !projid_eq(F2FS_I(old_dir)->i_projid,
1018 F2FS_I(new_dentry->d_inode)->i_projid)))
1019 return -EXDEV;
1020
1021 err = dquot_initialize(old_dir);
1022 if (err)
1023 goto out;
1024
1025 err = dquot_initialize(new_dir);
1026 if (err)
1027 goto out;
1028
1029 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1030 if (!old_entry) {
1031 if (IS_ERR(old_page))
1032 err = PTR_ERR(old_page);
1033 goto out;
1034 }
1035
1036 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1037 if (!new_entry) {
1038 if (IS_ERR(new_page))
1039 err = PTR_ERR(new_page);
1040 goto out_old;
1041 }
1042
1043 /* prepare for updating ".." directory entry info later */
1044 if (old_dir != new_dir) {
1045 if (S_ISDIR(old_inode->i_mode)) {
1046 old_dir_entry = f2fs_parent_dir(old_inode,
1047 &old_dir_page);
1048 if (!old_dir_entry) {
1049 if (IS_ERR(old_dir_page))
1050 err = PTR_ERR(old_dir_page);
1051 goto out_new;
1052 }
1053 }
1054
1055 if (S_ISDIR(new_inode->i_mode)) {
1056 new_dir_entry = f2fs_parent_dir(new_inode,
1057 &new_dir_page);
1058 if (!new_dir_entry) {
1059 if (IS_ERR(new_dir_page))
1060 err = PTR_ERR(new_dir_page);
1061 goto out_old_dir;
1062 }
1063 }
1064 }
1065
1066 /*
1067 * If cross rename between file and directory those are not
1068 * in the same directory, we will inc nlink of file's parent
1069 * later, so we should check upper boundary of its nlink.
1070 */
1071 if ((!old_dir_entry || !new_dir_entry) &&
1072 old_dir_entry != new_dir_entry) {
1073 old_nlink = old_dir_entry ? -1 : 1;
1074 new_nlink = -old_nlink;
1075 err = -EMLINK;
1076 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1077 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1078 goto out_new_dir;
1079 }
1080
1081 f2fs_balance_fs(sbi, true);
1082
1083 f2fs_lock_op(sbi);
1084
1085 /* update ".." directory entry info of old dentry */
1086 if (old_dir_entry)
1087 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1088
1089 /* update ".." directory entry info of new dentry */
1090 if (new_dir_entry)
1091 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1092
1093 /* update directory entry info of old dir inode */
1094 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1095
1096 down_write(&F2FS_I(old_inode)->i_sem);
1097 file_lost_pino(old_inode);
1098 up_write(&F2FS_I(old_inode)->i_sem);
1099
1100 old_dir->i_ctime = current_time(old_dir);
1101 if (old_nlink) {
1102 down_write(&F2FS_I(old_dir)->i_sem);
1103 f2fs_i_links_write(old_dir, old_nlink > 0);
1104 up_write(&F2FS_I(old_dir)->i_sem);
1105 }
1106 f2fs_mark_inode_dirty_sync(old_dir, false);
1107
1108 /* update directory entry info of new dir inode */
1109 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1110
1111 down_write(&F2FS_I(new_inode)->i_sem);
1112 file_lost_pino(new_inode);
1113 up_write(&F2FS_I(new_inode)->i_sem);
1114
1115 new_dir->i_ctime = current_time(new_dir);
1116 if (new_nlink) {
1117 down_write(&F2FS_I(new_dir)->i_sem);
1118 f2fs_i_links_write(new_dir, new_nlink > 0);
1119 up_write(&F2FS_I(new_dir)->i_sem);
1120 }
1121 f2fs_mark_inode_dirty_sync(new_dir, false);
1122
1123 f2fs_unlock_op(sbi);
1124
1125 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1126 f2fs_sync_fs(sbi->sb, 1);
1127 return 0;
1128 out_new_dir:
1129 if (new_dir_entry) {
1130 f2fs_dentry_kunmap(new_inode, new_dir_page);
1131 f2fs_put_page(new_dir_page, 0);
1132 }
1133 out_old_dir:
1134 if (old_dir_entry) {
1135 f2fs_dentry_kunmap(old_inode, old_dir_page);
1136 f2fs_put_page(old_dir_page, 0);
1137 }
1138 out_new:
1139 f2fs_dentry_kunmap(new_dir, new_page);
1140 f2fs_put_page(new_page, 0);
1141 out_old:
1142 f2fs_dentry_kunmap(old_dir, old_page);
1143 f2fs_put_page(old_page, 0);
1144 out:
1145 return err;
1146 }
1147
1148 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1149 struct inode *new_dir, struct dentry *new_dentry,
1150 unsigned int flags)
1151 {
1152 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1153 return -EINVAL;
1154
1155 if (flags & RENAME_EXCHANGE) {
1156 return f2fs_cross_rename(old_dir, old_dentry,
1157 new_dir, new_dentry);
1158 }
1159 /*
1160 * VFS has already handled the new dentry existence case,
1161 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1162 */
1163 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1164 }
1165
1166 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1167 struct inode *inode,
1168 struct delayed_call *done)
1169 {
1170 struct page *cpage = NULL;
1171 char *caddr, *paddr = NULL;
1172 struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1173 struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1174 struct fscrypt_symlink_data *sd;
1175 u32 max_size = inode->i_sb->s_blocksize;
1176 int res;
1177
1178 if (!dentry)
1179 return ERR_PTR(-ECHILD);
1180
1181 res = fscrypt_get_encryption_info(inode);
1182 if (res)
1183 return ERR_PTR(res);
1184
1185 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1186 if (IS_ERR(cpage))
1187 return ERR_CAST(cpage);
1188 caddr = page_address(cpage);
1189
1190 /* Symlink is encrypted */
1191 sd = (struct fscrypt_symlink_data *)caddr;
1192 cstr.name = sd->encrypted_path;
1193 cstr.len = le16_to_cpu(sd->len);
1194
1195 /* this is broken symlink case */
1196 if (unlikely(cstr.len == 0)) {
1197 res = -ENOENT;
1198 goto errout;
1199 }
1200
1201 if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1202 /* Symlink data on the disk is corrupted */
1203 res = -EIO;
1204 goto errout;
1205 }
1206 res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1207 if (res)
1208 goto errout;
1209
1210 res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1211 if (res)
1212 goto errout;
1213
1214 /* this is broken symlink case */
1215 if (unlikely(pstr.name[0] == 0)) {
1216 res = -ENOENT;
1217 goto errout;
1218 }
1219
1220 paddr = pstr.name;
1221
1222 /* Null-terminate the name */
1223 paddr[pstr.len] = '\0';
1224
1225 put_page(cpage);
1226 set_delayed_call(done, kfree_link, paddr);
1227 return paddr;
1228 errout:
1229 fscrypt_fname_free_buffer(&pstr);
1230 put_page(cpage);
1231 return ERR_PTR(res);
1232 }
1233
1234 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1235 .get_link = f2fs_encrypted_get_link,
1236 .getattr = f2fs_getattr,
1237 .setattr = f2fs_setattr,
1238 #ifdef CONFIG_F2FS_FS_XATTR
1239 .listxattr = f2fs_listxattr,
1240 #endif
1241 };
1242
1243 const struct inode_operations f2fs_dir_inode_operations = {
1244 .create = f2fs_create,
1245 .lookup = f2fs_lookup,
1246 .link = f2fs_link,
1247 .unlink = f2fs_unlink,
1248 .symlink = f2fs_symlink,
1249 .mkdir = f2fs_mkdir,
1250 .rmdir = f2fs_rmdir,
1251 .mknod = f2fs_mknod,
1252 .rename = f2fs_rename2,
1253 .tmpfile = f2fs_tmpfile,
1254 .getattr = f2fs_getattr,
1255 .setattr = f2fs_setattr,
1256 .get_acl = f2fs_get_acl,
1257 .set_acl = f2fs_set_acl,
1258 #ifdef CONFIG_F2FS_FS_XATTR
1259 .listxattr = f2fs_listxattr,
1260 #endif
1261 };
1262
1263 const struct inode_operations f2fs_symlink_inode_operations = {
1264 .get_link = f2fs_get_link,
1265 .getattr = f2fs_getattr,
1266 .setattr = f2fs_setattr,
1267 #ifdef CONFIG_F2FS_FS_XATTR
1268 .listxattr = f2fs_listxattr,
1269 #endif
1270 };
1271
1272 const struct inode_operations f2fs_special_inode_operations = {
1273 .getattr = f2fs_getattr,
1274 .setattr = f2fs_setattr,
1275 .get_acl = f2fs_get_acl,
1276 .set_acl = f2fs_set_acl,
1277 #ifdef CONFIG_F2FS_FS_XATTR
1278 .listxattr = f2fs_listxattr,
1279 #endif
1280 };
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