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memory-barriers.txt: Fix broken link to atomic_ops.txt
[mirror_ubuntu-bionic-kernel.git] / fs / f2fs / namei.c
1 /*
2 * fs/f2fs/namei.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11 #include <linux/fs.h>
12 #include <linux/f2fs_fs.h>
13 #include <linux/pagemap.h>
14 #include <linux/sched.h>
15 #include <linux/ctype.h>
16 #include <linux/dcache.h>
17 #include <linux/namei.h>
18
19 #include "f2fs.h"
20 #include "node.h"
21 #include "xattr.h"
22 #include "acl.h"
23 #include <trace/events/f2fs.h>
24
25 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
26 {
27 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
28 nid_t ino;
29 struct inode *inode;
30 bool nid_free = false;
31 int err;
32
33 inode = new_inode(dir->i_sb);
34 if (!inode)
35 return ERR_PTR(-ENOMEM);
36
37 f2fs_lock_op(sbi);
38 if (!alloc_nid(sbi, &ino)) {
39 f2fs_unlock_op(sbi);
40 err = -ENOSPC;
41 goto fail;
42 }
43 f2fs_unlock_op(sbi);
44
45 inode_init_owner(inode, dir, mode);
46
47 inode->i_ino = ino;
48 inode->i_blocks = 0;
49 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
50 inode->i_generation = sbi->s_next_generation++;
51
52 err = insert_inode_locked(inode);
53 if (err) {
54 err = -EINVAL;
55 nid_free = true;
56 goto fail;
57 }
58
59 /* If the directory encrypted, then we should encrypt the inode. */
60 if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
61 f2fs_set_encrypted_inode(inode);
62
63 set_inode_flag(inode, FI_NEW_INODE);
64
65 if (test_opt(sbi, INLINE_XATTR))
66 set_inode_flag(inode, FI_INLINE_XATTR);
67 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
68 set_inode_flag(inode, FI_INLINE_DATA);
69 if (f2fs_may_inline_dentry(inode))
70 set_inode_flag(inode, FI_INLINE_DENTRY);
71
72 f2fs_init_extent_tree(inode, NULL);
73
74 stat_inc_inline_xattr(inode);
75 stat_inc_inline_inode(inode);
76 stat_inc_inline_dir(inode);
77
78 trace_f2fs_new_inode(inode, 0);
79 return inode;
80
81 fail:
82 trace_f2fs_new_inode(inode, err);
83 make_bad_inode(inode);
84 if (nid_free)
85 set_inode_flag(inode, FI_FREE_NID);
86 iput(inode);
87 return ERR_PTR(err);
88 }
89
90 static int is_multimedia_file(const unsigned char *s, const char *sub)
91 {
92 size_t slen = strlen(s);
93 size_t sublen = strlen(sub);
94 int i;
95
96 /*
97 * filename format of multimedia file should be defined as:
98 * "filename + '.' + extension + (optional: '.' + temp extension)".
99 */
100 if (slen < sublen + 2)
101 return 0;
102
103 for (i = 1; i < slen - sublen; i++) {
104 if (s[i] != '.')
105 continue;
106 if (!strncasecmp(s + i + 1, sub, sublen))
107 return 1;
108 }
109
110 return 0;
111 }
112
113 /*
114 * Set multimedia files as cold files for hot/cold data separation
115 */
116 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
117 const unsigned char *name)
118 {
119 int i;
120 __u8 (*extlist)[8] = sbi->raw_super->extension_list;
121
122 int count = le32_to_cpu(sbi->raw_super->extension_count);
123 for (i = 0; i < count; i++) {
124 if (is_multimedia_file(name, extlist[i])) {
125 file_set_cold(inode);
126 break;
127 }
128 }
129 }
130
131 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
132 bool excl)
133 {
134 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
135 struct inode *inode;
136 nid_t ino = 0;
137 int err;
138
139 inode = f2fs_new_inode(dir, mode);
140 if (IS_ERR(inode))
141 return PTR_ERR(inode);
142
143 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
144 set_cold_files(sbi, inode, dentry->d_name.name);
145
146 inode->i_op = &f2fs_file_inode_operations;
147 inode->i_fop = &f2fs_file_operations;
148 inode->i_mapping->a_ops = &f2fs_dblock_aops;
149 ino = inode->i_ino;
150
151 f2fs_lock_op(sbi);
152 err = f2fs_add_link(dentry, inode);
153 if (err)
154 goto out;
155 f2fs_unlock_op(sbi);
156
157 alloc_nid_done(sbi, ino);
158
159 d_instantiate(dentry, inode);
160 unlock_new_inode(inode);
161
162 if (IS_DIRSYNC(dir))
163 f2fs_sync_fs(sbi->sb, 1);
164
165 f2fs_balance_fs(sbi, true);
166 return 0;
167 out:
168 handle_failed_inode(inode);
169 return err;
170 }
171
172 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
173 struct dentry *dentry)
174 {
175 struct inode *inode = d_inode(old_dentry);
176 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
177 int err;
178
179 if (f2fs_encrypted_inode(dir) &&
180 !fscrypt_has_permitted_context(dir, inode))
181 return -EPERM;
182
183 f2fs_balance_fs(sbi, true);
184
185 inode->i_ctime = current_time(inode);
186 ihold(inode);
187
188 set_inode_flag(inode, FI_INC_LINK);
189 f2fs_lock_op(sbi);
190 err = f2fs_add_link(dentry, inode);
191 if (err)
192 goto out;
193 f2fs_unlock_op(sbi);
194
195 d_instantiate(dentry, inode);
196
197 if (IS_DIRSYNC(dir))
198 f2fs_sync_fs(sbi->sb, 1);
199 return 0;
200 out:
201 clear_inode_flag(inode, FI_INC_LINK);
202 iput(inode);
203 f2fs_unlock_op(sbi);
204 return err;
205 }
206
207 struct dentry *f2fs_get_parent(struct dentry *child)
208 {
209 struct qstr dotdot = QSTR_INIT("..", 2);
210 struct page *page;
211 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
212 if (!ino) {
213 if (IS_ERR(page))
214 return ERR_CAST(page);
215 return ERR_PTR(-ENOENT);
216 }
217 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
218 }
219
220 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
221 {
222 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
223 struct qstr dot = QSTR_INIT(".", 1);
224 struct qstr dotdot = QSTR_INIT("..", 2);
225 struct f2fs_dir_entry *de;
226 struct page *page;
227 int err = 0;
228
229 if (f2fs_readonly(sbi->sb)) {
230 f2fs_msg(sbi->sb, KERN_INFO,
231 "skip recovering inline_dots inode (ino:%lu, pino:%u) "
232 "in readonly mountpoint", dir->i_ino, pino);
233 return 0;
234 }
235
236 f2fs_balance_fs(sbi, true);
237
238 f2fs_lock_op(sbi);
239
240 de = f2fs_find_entry(dir, &dot, &page);
241 if (de) {
242 f2fs_dentry_kunmap(dir, page);
243 f2fs_put_page(page, 0);
244 } else if (IS_ERR(page)) {
245 err = PTR_ERR(page);
246 goto out;
247 } else {
248 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
249 if (err)
250 goto out;
251 }
252
253 de = f2fs_find_entry(dir, &dotdot, &page);
254 if (de) {
255 f2fs_dentry_kunmap(dir, page);
256 f2fs_put_page(page, 0);
257 } else if (IS_ERR(page)) {
258 err = PTR_ERR(page);
259 } else {
260 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
261 }
262 out:
263 if (!err)
264 clear_inode_flag(dir, FI_INLINE_DOTS);
265
266 f2fs_unlock_op(sbi);
267 return err;
268 }
269
270 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
271 unsigned int flags)
272 {
273 struct inode *inode = NULL;
274 struct f2fs_dir_entry *de;
275 struct page *page;
276 nid_t ino;
277 int err = 0;
278 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
279
280 if (f2fs_encrypted_inode(dir)) {
281 int res = fscrypt_get_encryption_info(dir);
282
283 /*
284 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
285 * created while the directory was encrypted and we
286 * don't have access to the key.
287 */
288 if (fscrypt_has_encryption_key(dir))
289 fscrypt_set_encrypted_dentry(dentry);
290 fscrypt_set_d_op(dentry);
291 if (res && res != -ENOKEY)
292 return ERR_PTR(res);
293 }
294
295 if (dentry->d_name.len > F2FS_NAME_LEN)
296 return ERR_PTR(-ENAMETOOLONG);
297
298 de = f2fs_find_entry(dir, &dentry->d_name, &page);
299 if (!de) {
300 if (IS_ERR(page))
301 return (struct dentry *)page;
302 return d_splice_alias(inode, dentry);
303 }
304
305 ino = le32_to_cpu(de->ino);
306 f2fs_dentry_kunmap(dir, page);
307 f2fs_put_page(page, 0);
308
309 inode = f2fs_iget(dir->i_sb, ino);
310 if (IS_ERR(inode))
311 return ERR_CAST(inode);
312
313 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
314 err = __recover_dot_dentries(dir, root_ino);
315 if (err)
316 goto err_out;
317 }
318
319 if (f2fs_has_inline_dots(inode)) {
320 err = __recover_dot_dentries(inode, dir->i_ino);
321 if (err)
322 goto err_out;
323 }
324 if (f2fs_encrypted_inode(dir) &&
325 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
326 !fscrypt_has_permitted_context(dir, inode)) {
327 f2fs_msg(inode->i_sb, KERN_WARNING,
328 "Inconsistent encryption contexts: %lu/%lu",
329 dir->i_ino, inode->i_ino);
330 err = -EPERM;
331 goto err_out;
332 }
333 return d_splice_alias(inode, dentry);
334
335 err_out:
336 iput(inode);
337 return ERR_PTR(err);
338 }
339
340 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
341 {
342 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
343 struct inode *inode = d_inode(dentry);
344 struct f2fs_dir_entry *de;
345 struct page *page;
346 int err = -ENOENT;
347
348 trace_f2fs_unlink_enter(dir, dentry);
349
350 de = f2fs_find_entry(dir, &dentry->d_name, &page);
351 if (!de) {
352 if (IS_ERR(page))
353 err = PTR_ERR(page);
354 goto fail;
355 }
356
357 f2fs_balance_fs(sbi, true);
358
359 f2fs_lock_op(sbi);
360 err = acquire_orphan_inode(sbi);
361 if (err) {
362 f2fs_unlock_op(sbi);
363 f2fs_dentry_kunmap(dir, page);
364 f2fs_put_page(page, 0);
365 goto fail;
366 }
367 f2fs_delete_entry(de, page, dir, inode);
368 f2fs_unlock_op(sbi);
369
370 if (IS_DIRSYNC(dir))
371 f2fs_sync_fs(sbi->sb, 1);
372 fail:
373 trace_f2fs_unlink_exit(inode, err);
374 return err;
375 }
376
377 static const char *f2fs_get_link(struct dentry *dentry,
378 struct inode *inode,
379 struct delayed_call *done)
380 {
381 const char *link = page_get_link(dentry, inode, done);
382 if (!IS_ERR(link) && !*link) {
383 /* this is broken symlink case */
384 do_delayed_call(done);
385 clear_delayed_call(done);
386 link = ERR_PTR(-ENOENT);
387 }
388 return link;
389 }
390
391 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
392 const char *symname)
393 {
394 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
395 struct inode *inode;
396 size_t len = strlen(symname);
397 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
398 struct fscrypt_symlink_data *sd = NULL;
399 int err;
400
401 if (f2fs_encrypted_inode(dir)) {
402 err = fscrypt_get_encryption_info(dir);
403 if (err)
404 return err;
405
406 if (!fscrypt_has_encryption_key(dir))
407 return -ENOKEY;
408
409 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
410 sizeof(struct fscrypt_symlink_data));
411 }
412
413 if (disk_link.len > dir->i_sb->s_blocksize)
414 return -ENAMETOOLONG;
415
416 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
417 if (IS_ERR(inode))
418 return PTR_ERR(inode);
419
420 if (f2fs_encrypted_inode(inode))
421 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
422 else
423 inode->i_op = &f2fs_symlink_inode_operations;
424 inode_nohighmem(inode);
425 inode->i_mapping->a_ops = &f2fs_dblock_aops;
426
427 f2fs_lock_op(sbi);
428 err = f2fs_add_link(dentry, inode);
429 if (err)
430 goto out;
431 f2fs_unlock_op(sbi);
432 alloc_nid_done(sbi, inode->i_ino);
433
434 if (f2fs_encrypted_inode(inode)) {
435 struct qstr istr = QSTR_INIT(symname, len);
436 struct fscrypt_str ostr;
437
438 sd = kzalloc(disk_link.len, GFP_NOFS);
439 if (!sd) {
440 err = -ENOMEM;
441 goto err_out;
442 }
443
444 err = fscrypt_get_encryption_info(inode);
445 if (err)
446 goto err_out;
447
448 if (!fscrypt_has_encryption_key(inode)) {
449 err = -ENOKEY;
450 goto err_out;
451 }
452
453 ostr.name = sd->encrypted_path;
454 ostr.len = disk_link.len;
455 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
456 if (err)
457 goto err_out;
458
459 sd->len = cpu_to_le16(ostr.len);
460 disk_link.name = (char *)sd;
461 }
462
463 err = page_symlink(inode, disk_link.name, disk_link.len);
464
465 err_out:
466 d_instantiate(dentry, inode);
467 unlock_new_inode(inode);
468
469 /*
470 * Let's flush symlink data in order to avoid broken symlink as much as
471 * possible. Nevertheless, fsyncing is the best way, but there is no
472 * way to get a file descriptor in order to flush that.
473 *
474 * Note that, it needs to do dir->fsync to make this recoverable.
475 * If the symlink path is stored into inline_data, there is no
476 * performance regression.
477 */
478 if (!err) {
479 filemap_write_and_wait_range(inode->i_mapping, 0,
480 disk_link.len - 1);
481
482 if (IS_DIRSYNC(dir))
483 f2fs_sync_fs(sbi->sb, 1);
484 } else {
485 f2fs_unlink(dir, dentry);
486 }
487
488 kfree(sd);
489
490 f2fs_balance_fs(sbi, true);
491 return err;
492 out:
493 handle_failed_inode(inode);
494 return err;
495 }
496
497 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
498 {
499 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
500 struct inode *inode;
501 int err;
502
503 inode = f2fs_new_inode(dir, S_IFDIR | mode);
504 if (IS_ERR(inode))
505 return PTR_ERR(inode);
506
507 inode->i_op = &f2fs_dir_inode_operations;
508 inode->i_fop = &f2fs_dir_operations;
509 inode->i_mapping->a_ops = &f2fs_dblock_aops;
510 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
511
512 set_inode_flag(inode, FI_INC_LINK);
513 f2fs_lock_op(sbi);
514 err = f2fs_add_link(dentry, inode);
515 if (err)
516 goto out_fail;
517 f2fs_unlock_op(sbi);
518
519 alloc_nid_done(sbi, inode->i_ino);
520
521 d_instantiate(dentry, inode);
522 unlock_new_inode(inode);
523
524 if (IS_DIRSYNC(dir))
525 f2fs_sync_fs(sbi->sb, 1);
526
527 f2fs_balance_fs(sbi, true);
528 return 0;
529
530 out_fail:
531 clear_inode_flag(inode, FI_INC_LINK);
532 handle_failed_inode(inode);
533 return err;
534 }
535
536 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
537 {
538 struct inode *inode = d_inode(dentry);
539 if (f2fs_empty_dir(inode))
540 return f2fs_unlink(dir, dentry);
541 return -ENOTEMPTY;
542 }
543
544 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
545 umode_t mode, dev_t rdev)
546 {
547 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
548 struct inode *inode;
549 int err = 0;
550
551 inode = f2fs_new_inode(dir, mode);
552 if (IS_ERR(inode))
553 return PTR_ERR(inode);
554
555 init_special_inode(inode, inode->i_mode, rdev);
556 inode->i_op = &f2fs_special_inode_operations;
557
558 f2fs_lock_op(sbi);
559 err = f2fs_add_link(dentry, inode);
560 if (err)
561 goto out;
562 f2fs_unlock_op(sbi);
563
564 alloc_nid_done(sbi, inode->i_ino);
565
566 d_instantiate(dentry, inode);
567 unlock_new_inode(inode);
568
569 if (IS_DIRSYNC(dir))
570 f2fs_sync_fs(sbi->sb, 1);
571
572 f2fs_balance_fs(sbi, true);
573 return 0;
574 out:
575 handle_failed_inode(inode);
576 return err;
577 }
578
579 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
580 umode_t mode, struct inode **whiteout)
581 {
582 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
583 struct inode *inode;
584 int err;
585
586 inode = f2fs_new_inode(dir, mode);
587 if (IS_ERR(inode))
588 return PTR_ERR(inode);
589
590 if (whiteout) {
591 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
592 inode->i_op = &f2fs_special_inode_operations;
593 } else {
594 inode->i_op = &f2fs_file_inode_operations;
595 inode->i_fop = &f2fs_file_operations;
596 inode->i_mapping->a_ops = &f2fs_dblock_aops;
597 }
598
599 f2fs_lock_op(sbi);
600 err = acquire_orphan_inode(sbi);
601 if (err)
602 goto out;
603
604 err = f2fs_do_tmpfile(inode, dir);
605 if (err)
606 goto release_out;
607
608 /*
609 * add this non-linked tmpfile to orphan list, in this way we could
610 * remove all unused data of tmpfile after abnormal power-off.
611 */
612 add_orphan_inode(inode);
613 alloc_nid_done(sbi, inode->i_ino);
614
615 if (whiteout) {
616 f2fs_i_links_write(inode, false);
617 *whiteout = inode;
618 } else {
619 d_tmpfile(dentry, inode);
620 }
621 /* link_count was changed by d_tmpfile as well. */
622 f2fs_unlock_op(sbi);
623 unlock_new_inode(inode);
624
625 f2fs_balance_fs(sbi, true);
626 return 0;
627
628 release_out:
629 release_orphan_inode(sbi);
630 out:
631 handle_failed_inode(inode);
632 return err;
633 }
634
635 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
636 {
637 if (f2fs_encrypted_inode(dir)) {
638 int err = fscrypt_get_encryption_info(dir);
639 if (err)
640 return err;
641 }
642
643 return __f2fs_tmpfile(dir, dentry, mode, NULL);
644 }
645
646 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
647 {
648 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
649 }
650
651 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
652 struct inode *new_dir, struct dentry *new_dentry,
653 unsigned int flags)
654 {
655 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
656 struct inode *old_inode = d_inode(old_dentry);
657 struct inode *new_inode = d_inode(new_dentry);
658 struct inode *whiteout = NULL;
659 struct page *old_dir_page;
660 struct page *old_page, *new_page = NULL;
661 struct f2fs_dir_entry *old_dir_entry = NULL;
662 struct f2fs_dir_entry *old_entry;
663 struct f2fs_dir_entry *new_entry;
664 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
665 int err = -ENOENT;
666
667 if ((f2fs_encrypted_inode(old_dir) &&
668 !fscrypt_has_encryption_key(old_dir)) ||
669 (f2fs_encrypted_inode(new_dir) &&
670 !fscrypt_has_encryption_key(new_dir)))
671 return -ENOKEY;
672
673 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
674 !fscrypt_has_permitted_context(new_dir, old_inode)) {
675 err = -EPERM;
676 goto out;
677 }
678
679 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
680 if (!old_entry) {
681 if (IS_ERR(old_page))
682 err = PTR_ERR(old_page);
683 goto out;
684 }
685
686 if (S_ISDIR(old_inode->i_mode)) {
687 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
688 if (!old_dir_entry) {
689 if (IS_ERR(old_dir_page))
690 err = PTR_ERR(old_dir_page);
691 goto out_old;
692 }
693 }
694
695 if (flags & RENAME_WHITEOUT) {
696 err = f2fs_create_whiteout(old_dir, &whiteout);
697 if (err)
698 goto out_dir;
699 }
700
701 if (new_inode) {
702
703 err = -ENOTEMPTY;
704 if (old_dir_entry && !f2fs_empty_dir(new_inode))
705 goto out_whiteout;
706
707 err = -ENOENT;
708 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
709 &new_page);
710 if (!new_entry) {
711 if (IS_ERR(new_page))
712 err = PTR_ERR(new_page);
713 goto out_whiteout;
714 }
715
716 f2fs_balance_fs(sbi, true);
717
718 f2fs_lock_op(sbi);
719
720 err = acquire_orphan_inode(sbi);
721 if (err)
722 goto put_out_dir;
723
724 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
725
726 new_inode->i_ctime = current_time(new_inode);
727 down_write(&F2FS_I(new_inode)->i_sem);
728 if (old_dir_entry)
729 f2fs_i_links_write(new_inode, false);
730 f2fs_i_links_write(new_inode, false);
731 up_write(&F2FS_I(new_inode)->i_sem);
732
733 if (!new_inode->i_nlink)
734 add_orphan_inode(new_inode);
735 else
736 release_orphan_inode(sbi);
737 } else {
738 f2fs_balance_fs(sbi, true);
739
740 f2fs_lock_op(sbi);
741
742 err = f2fs_add_link(new_dentry, old_inode);
743 if (err) {
744 f2fs_unlock_op(sbi);
745 goto out_whiteout;
746 }
747
748 if (old_dir_entry)
749 f2fs_i_links_write(new_dir, true);
750
751 /*
752 * old entry and new entry can locate in the same inline
753 * dentry in inode, when attaching new entry in inline dentry,
754 * it could force inline dentry conversion, after that,
755 * old_entry and old_page will point to wrong address, in
756 * order to avoid this, let's do the check and update here.
757 */
758 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
759 f2fs_put_page(old_page, 0);
760 old_page = NULL;
761
762 old_entry = f2fs_find_entry(old_dir,
763 &old_dentry->d_name, &old_page);
764 if (!old_entry) {
765 err = -ENOENT;
766 if (IS_ERR(old_page))
767 err = PTR_ERR(old_page);
768 f2fs_unlock_op(sbi);
769 goto out_whiteout;
770 }
771 }
772 }
773
774 down_write(&F2FS_I(old_inode)->i_sem);
775 file_lost_pino(old_inode);
776 up_write(&F2FS_I(old_inode)->i_sem);
777
778 old_inode->i_ctime = current_time(old_inode);
779 f2fs_mark_inode_dirty_sync(old_inode, false);
780
781 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
782
783 if (whiteout) {
784 whiteout->i_state |= I_LINKABLE;
785 set_inode_flag(whiteout, FI_INC_LINK);
786 err = f2fs_add_link(old_dentry, whiteout);
787 if (err)
788 goto put_out_dir;
789 whiteout->i_state &= ~I_LINKABLE;
790 iput(whiteout);
791 }
792
793 if (old_dir_entry) {
794 if (old_dir != new_dir && !whiteout) {
795 f2fs_set_link(old_inode, old_dir_entry,
796 old_dir_page, new_dir);
797 } else {
798 f2fs_dentry_kunmap(old_inode, old_dir_page);
799 f2fs_put_page(old_dir_page, 0);
800 }
801 f2fs_i_links_write(old_dir, false);
802 }
803
804 f2fs_unlock_op(sbi);
805
806 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
807 f2fs_sync_fs(sbi->sb, 1);
808 return 0;
809
810 put_out_dir:
811 f2fs_unlock_op(sbi);
812 if (new_page) {
813 f2fs_dentry_kunmap(new_dir, new_page);
814 f2fs_put_page(new_page, 0);
815 }
816 out_whiteout:
817 if (whiteout)
818 iput(whiteout);
819 out_dir:
820 if (old_dir_entry) {
821 f2fs_dentry_kunmap(old_inode, old_dir_page);
822 f2fs_put_page(old_dir_page, 0);
823 }
824 out_old:
825 f2fs_dentry_kunmap(old_dir, old_page);
826 f2fs_put_page(old_page, 0);
827 out:
828 return err;
829 }
830
831 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
832 struct inode *new_dir, struct dentry *new_dentry)
833 {
834 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
835 struct inode *old_inode = d_inode(old_dentry);
836 struct inode *new_inode = d_inode(new_dentry);
837 struct page *old_dir_page, *new_dir_page;
838 struct page *old_page, *new_page;
839 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
840 struct f2fs_dir_entry *old_entry, *new_entry;
841 int old_nlink = 0, new_nlink = 0;
842 int err = -ENOENT;
843
844 if ((f2fs_encrypted_inode(old_dir) &&
845 !fscrypt_has_encryption_key(old_dir)) ||
846 (f2fs_encrypted_inode(new_dir) &&
847 !fscrypt_has_encryption_key(new_dir)))
848 return -ENOKEY;
849
850 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
851 (old_dir != new_dir) &&
852 (!fscrypt_has_permitted_context(new_dir, old_inode) ||
853 !fscrypt_has_permitted_context(old_dir, new_inode)))
854 return -EPERM;
855
856 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
857 if (!old_entry) {
858 if (IS_ERR(old_page))
859 err = PTR_ERR(old_page);
860 goto out;
861 }
862
863 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
864 if (!new_entry) {
865 if (IS_ERR(new_page))
866 err = PTR_ERR(new_page);
867 goto out_old;
868 }
869
870 /* prepare for updating ".." directory entry info later */
871 if (old_dir != new_dir) {
872 if (S_ISDIR(old_inode->i_mode)) {
873 old_dir_entry = f2fs_parent_dir(old_inode,
874 &old_dir_page);
875 if (!old_dir_entry) {
876 if (IS_ERR(old_dir_page))
877 err = PTR_ERR(old_dir_page);
878 goto out_new;
879 }
880 }
881
882 if (S_ISDIR(new_inode->i_mode)) {
883 new_dir_entry = f2fs_parent_dir(new_inode,
884 &new_dir_page);
885 if (!new_dir_entry) {
886 if (IS_ERR(new_dir_page))
887 err = PTR_ERR(new_dir_page);
888 goto out_old_dir;
889 }
890 }
891 }
892
893 /*
894 * If cross rename between file and directory those are not
895 * in the same directory, we will inc nlink of file's parent
896 * later, so we should check upper boundary of its nlink.
897 */
898 if ((!old_dir_entry || !new_dir_entry) &&
899 old_dir_entry != new_dir_entry) {
900 old_nlink = old_dir_entry ? -1 : 1;
901 new_nlink = -old_nlink;
902 err = -EMLINK;
903 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
904 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
905 goto out_new_dir;
906 }
907
908 f2fs_balance_fs(sbi, true);
909
910 f2fs_lock_op(sbi);
911
912 /* update ".." directory entry info of old dentry */
913 if (old_dir_entry)
914 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
915
916 /* update ".." directory entry info of new dentry */
917 if (new_dir_entry)
918 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
919
920 /* update directory entry info of old dir inode */
921 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
922
923 down_write(&F2FS_I(old_inode)->i_sem);
924 file_lost_pino(old_inode);
925 up_write(&F2FS_I(old_inode)->i_sem);
926
927 old_dir->i_ctime = current_time(old_dir);
928 if (old_nlink) {
929 down_write(&F2FS_I(old_dir)->i_sem);
930 f2fs_i_links_write(old_dir, old_nlink > 0);
931 up_write(&F2FS_I(old_dir)->i_sem);
932 }
933 f2fs_mark_inode_dirty_sync(old_dir, false);
934
935 /* update directory entry info of new dir inode */
936 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
937
938 down_write(&F2FS_I(new_inode)->i_sem);
939 file_lost_pino(new_inode);
940 up_write(&F2FS_I(new_inode)->i_sem);
941
942 new_dir->i_ctime = current_time(new_dir);
943 if (new_nlink) {
944 down_write(&F2FS_I(new_dir)->i_sem);
945 f2fs_i_links_write(new_dir, new_nlink > 0);
946 up_write(&F2FS_I(new_dir)->i_sem);
947 }
948 f2fs_mark_inode_dirty_sync(new_dir, false);
949
950 f2fs_unlock_op(sbi);
951
952 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
953 f2fs_sync_fs(sbi->sb, 1);
954 return 0;
955 out_new_dir:
956 if (new_dir_entry) {
957 f2fs_dentry_kunmap(new_inode, new_dir_page);
958 f2fs_put_page(new_dir_page, 0);
959 }
960 out_old_dir:
961 if (old_dir_entry) {
962 f2fs_dentry_kunmap(old_inode, old_dir_page);
963 f2fs_put_page(old_dir_page, 0);
964 }
965 out_new:
966 f2fs_dentry_kunmap(new_dir, new_page);
967 f2fs_put_page(new_page, 0);
968 out_old:
969 f2fs_dentry_kunmap(old_dir, old_page);
970 f2fs_put_page(old_page, 0);
971 out:
972 return err;
973 }
974
975 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
976 struct inode *new_dir, struct dentry *new_dentry,
977 unsigned int flags)
978 {
979 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
980 return -EINVAL;
981
982 if (flags & RENAME_EXCHANGE) {
983 return f2fs_cross_rename(old_dir, old_dentry,
984 new_dir, new_dentry);
985 }
986 /*
987 * VFS has already handled the new dentry existence case,
988 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
989 */
990 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
991 }
992
993 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
994 struct inode *inode,
995 struct delayed_call *done)
996 {
997 struct page *cpage = NULL;
998 char *caddr, *paddr = NULL;
999 struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1000 struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1001 struct fscrypt_symlink_data *sd;
1002 u32 max_size = inode->i_sb->s_blocksize;
1003 int res;
1004
1005 if (!dentry)
1006 return ERR_PTR(-ECHILD);
1007
1008 res = fscrypt_get_encryption_info(inode);
1009 if (res)
1010 return ERR_PTR(res);
1011
1012 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1013 if (IS_ERR(cpage))
1014 return ERR_CAST(cpage);
1015 caddr = page_address(cpage);
1016
1017 /* Symlink is encrypted */
1018 sd = (struct fscrypt_symlink_data *)caddr;
1019 cstr.name = sd->encrypted_path;
1020 cstr.len = le16_to_cpu(sd->len);
1021
1022 /* this is broken symlink case */
1023 if (unlikely(cstr.len == 0)) {
1024 res = -ENOENT;
1025 goto errout;
1026 }
1027
1028 if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1029 /* Symlink data on the disk is corrupted */
1030 res = -EIO;
1031 goto errout;
1032 }
1033 res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1034 if (res)
1035 goto errout;
1036
1037 res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1038 if (res)
1039 goto errout;
1040
1041 /* this is broken symlink case */
1042 if (unlikely(pstr.name[0] == 0)) {
1043 res = -ENOENT;
1044 goto errout;
1045 }
1046
1047 paddr = pstr.name;
1048
1049 /* Null-terminate the name */
1050 paddr[pstr.len] = '\0';
1051
1052 put_page(cpage);
1053 set_delayed_call(done, kfree_link, paddr);
1054 return paddr;
1055 errout:
1056 fscrypt_fname_free_buffer(&pstr);
1057 put_page(cpage);
1058 return ERR_PTR(res);
1059 }
1060
1061 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1062 .get_link = f2fs_encrypted_get_link,
1063 .getattr = f2fs_getattr,
1064 .setattr = f2fs_setattr,
1065 #ifdef CONFIG_F2FS_FS_XATTR
1066 .listxattr = f2fs_listxattr,
1067 #endif
1068 };
1069
1070 const struct inode_operations f2fs_dir_inode_operations = {
1071 .create = f2fs_create,
1072 .lookup = f2fs_lookup,
1073 .link = f2fs_link,
1074 .unlink = f2fs_unlink,
1075 .symlink = f2fs_symlink,
1076 .mkdir = f2fs_mkdir,
1077 .rmdir = f2fs_rmdir,
1078 .mknod = f2fs_mknod,
1079 .rename = f2fs_rename2,
1080 .tmpfile = f2fs_tmpfile,
1081 .getattr = f2fs_getattr,
1082 .setattr = f2fs_setattr,
1083 .get_acl = f2fs_get_acl,
1084 .set_acl = f2fs_set_acl,
1085 #ifdef CONFIG_F2FS_FS_XATTR
1086 .listxattr = f2fs_listxattr,
1087 #endif
1088 };
1089
1090 const struct inode_operations f2fs_symlink_inode_operations = {
1091 .get_link = f2fs_get_link,
1092 .getattr = f2fs_getattr,
1093 .setattr = f2fs_setattr,
1094 #ifdef CONFIG_F2FS_FS_XATTR
1095 .listxattr = f2fs_listxattr,
1096 #endif
1097 };
1098
1099 const struct inode_operations f2fs_special_inode_operations = {
1100 .getattr = f2fs_getattr,
1101 .setattr = f2fs_setattr,
1102 .get_acl = f2fs_get_acl,
1103 .set_acl = f2fs_set_acl,
1104 #ifdef CONFIG_F2FS_FS_XATTR
1105 .listxattr = f2fs_listxattr,
1106 #endif
1107 };
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