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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
19#include "f2fs.h"
20#include "node.h"
21#include "xattr.h"
22#include "acl.h"
23#include <trace/events/f2fs.h>
24
25static 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
81fail:
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
90static 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 */
116static 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
131static 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_balance_fs(sbi, true);
152
153 f2fs_lock_op(sbi);
154 err = f2fs_add_link(dentry, inode);
155 if (err)
156 goto out;
157 f2fs_unlock_op(sbi);
158
159 alloc_nid_done(sbi, ino);
160
161 d_instantiate(dentry, inode);
162 unlock_new_inode(inode);
163
164 if (IS_DIRSYNC(dir))
165 f2fs_sync_fs(sbi->sb, 1);
166 return 0;
167out:
168 handle_failed_inode(inode);
169 return err;
170}
171
172static 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;
200out:
201 clear_inode_flag(inode, FI_INC_LINK);
202 iput(inode);
203 f2fs_unlock_op(sbi);
204 return err;
205}
206
207struct 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
220static 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 }
262out:
263 if (!err)
264 clear_inode_flag(dir, FI_INLINE_DOTS);
265
266 f2fs_unlock_op(sbi);
267 return err;
268}
269
270static 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 (!IS_ERR(inode) && f2fs_encrypted_inode(dir) &&
325 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
326 !fscrypt_has_permitted_context(dir, inode)) {
327 bool nokey = f2fs_encrypted_inode(inode) &&
328 !fscrypt_has_encryption_key(inode);
329 err = nokey ? -ENOKEY : -EPERM;
330 goto err_out;
331 }
332 return d_splice_alias(inode, dentry);
333
334err_out:
335 iput(inode);
336 return ERR_PTR(err);
337}
338
339static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
340{
341 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
342 struct inode *inode = d_inode(dentry);
343 struct f2fs_dir_entry *de;
344 struct page *page;
345 int err = -ENOENT;
346
347 trace_f2fs_unlink_enter(dir, dentry);
348
349 de = f2fs_find_entry(dir, &dentry->d_name, &page);
350 if (!de) {
351 if (IS_ERR(page))
352 err = PTR_ERR(page);
353 goto fail;
354 }
355
356 f2fs_balance_fs(sbi, true);
357
358 f2fs_lock_op(sbi);
359 err = acquire_orphan_inode(sbi);
360 if (err) {
361 f2fs_unlock_op(sbi);
362 f2fs_dentry_kunmap(dir, page);
363 f2fs_put_page(page, 0);
364 goto fail;
365 }
366 f2fs_delete_entry(de, page, dir, inode);
367 f2fs_unlock_op(sbi);
368
369 if (IS_DIRSYNC(dir))
370 f2fs_sync_fs(sbi->sb, 1);
371fail:
372 trace_f2fs_unlink_exit(inode, err);
373 return err;
374}
375
376static const char *f2fs_get_link(struct dentry *dentry,
377 struct inode *inode,
378 struct delayed_call *done)
379{
380 const char *link = page_get_link(dentry, inode, done);
381 if (!IS_ERR(link) && !*link) {
382 /* this is broken symlink case */
383 do_delayed_call(done);
384 clear_delayed_call(done);
385 link = ERR_PTR(-ENOENT);
386 }
387 return link;
388}
389
390static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
391 const char *symname)
392{
393 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
394 struct inode *inode;
395 size_t len = strlen(symname);
396 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
397 struct fscrypt_symlink_data *sd = NULL;
398 int err;
399
400 if (f2fs_encrypted_inode(dir)) {
401 err = fscrypt_get_encryption_info(dir);
402 if (err)
403 return err;
404
405 if (!fscrypt_has_encryption_key(dir))
406 return -EPERM;
407
408 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
409 sizeof(struct fscrypt_symlink_data));
410 }
411
412 if (disk_link.len > dir->i_sb->s_blocksize)
413 return -ENAMETOOLONG;
414
415 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
416 if (IS_ERR(inode))
417 return PTR_ERR(inode);
418
419 if (f2fs_encrypted_inode(inode))
420 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
421 else
422 inode->i_op = &f2fs_symlink_inode_operations;
423 inode_nohighmem(inode);
424 inode->i_mapping->a_ops = &f2fs_dblock_aops;
425
426 f2fs_balance_fs(sbi, true);
427
428 f2fs_lock_op(sbi);
429 err = f2fs_add_link(dentry, inode);
430 if (err)
431 goto out;
432 f2fs_unlock_op(sbi);
433 alloc_nid_done(sbi, inode->i_ino);
434
435 if (f2fs_encrypted_inode(inode)) {
436 struct qstr istr = QSTR_INIT(symname, len);
437 struct fscrypt_str ostr;
438
439 sd = kzalloc(disk_link.len, GFP_NOFS);
440 if (!sd) {
441 err = -ENOMEM;
442 goto err_out;
443 }
444
445 err = fscrypt_get_encryption_info(inode);
446 if (err)
447 goto err_out;
448
449 if (!fscrypt_has_encryption_key(inode)) {
450 err = -EPERM;
451 goto err_out;
452 }
453
454 ostr.name = sd->encrypted_path;
455 ostr.len = disk_link.len;
456 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
457 if (err)
458 goto err_out;
459
460 sd->len = cpu_to_le16(ostr.len);
461 disk_link.name = (char *)sd;
462 }
463
464 err = page_symlink(inode, disk_link.name, disk_link.len);
465
466err_out:
467 d_instantiate(dentry, inode);
468 unlock_new_inode(inode);
469
470 /*
471 * Let's flush symlink data in order to avoid broken symlink as much as
472 * possible. Nevertheless, fsyncing is the best way, but there is no
473 * way to get a file descriptor in order to flush that.
474 *
475 * Note that, it needs to do dir->fsync to make this recoverable.
476 * If the symlink path is stored into inline_data, there is no
477 * performance regression.
478 */
479 if (!err) {
480 filemap_write_and_wait_range(inode->i_mapping, 0,
481 disk_link.len - 1);
482
483 if (IS_DIRSYNC(dir))
484 f2fs_sync_fs(sbi->sb, 1);
485 } else {
486 f2fs_unlink(dir, dentry);
487 }
488
489 kfree(sd);
490 return err;
491out:
492 handle_failed_inode(inode);
493 return err;
494}
495
496static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
497{
498 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
499 struct inode *inode;
500 int err;
501
502 inode = f2fs_new_inode(dir, S_IFDIR | mode);
503 if (IS_ERR(inode))
504 return PTR_ERR(inode);
505
506 inode->i_op = &f2fs_dir_inode_operations;
507 inode->i_fop = &f2fs_dir_operations;
508 inode->i_mapping->a_ops = &f2fs_dblock_aops;
509 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
510
511 f2fs_balance_fs(sbi, true);
512
513 set_inode_flag(inode, FI_INC_LINK);
514 f2fs_lock_op(sbi);
515 err = f2fs_add_link(dentry, inode);
516 if (err)
517 goto out_fail;
518 f2fs_unlock_op(sbi);
519
520 alloc_nid_done(sbi, inode->i_ino);
521
522 d_instantiate(dentry, inode);
523 unlock_new_inode(inode);
524
525 if (IS_DIRSYNC(dir))
526 f2fs_sync_fs(sbi->sb, 1);
527 return 0;
528
529out_fail:
530 clear_inode_flag(inode, FI_INC_LINK);
531 handle_failed_inode(inode);
532 return err;
533}
534
535static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
536{
537 struct inode *inode = d_inode(dentry);
538 if (f2fs_empty_dir(inode))
539 return f2fs_unlink(dir, dentry);
540 return -ENOTEMPTY;
541}
542
543static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
544 umode_t mode, dev_t rdev)
545{
546 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
547 struct inode *inode;
548 int err = 0;
549
550 inode = f2fs_new_inode(dir, mode);
551 if (IS_ERR(inode))
552 return PTR_ERR(inode);
553
554 init_special_inode(inode, inode->i_mode, rdev);
555 inode->i_op = &f2fs_special_inode_operations;
556
557 f2fs_balance_fs(sbi, true);
558
559 f2fs_lock_op(sbi);
560 err = f2fs_add_link(dentry, inode);
561 if (err)
562 goto out;
563 f2fs_unlock_op(sbi);
564
565 alloc_nid_done(sbi, inode->i_ino);
566
567 d_instantiate(dentry, inode);
568 unlock_new_inode(inode);
569
570 if (IS_DIRSYNC(dir))
571 f2fs_sync_fs(sbi->sb, 1);
572 return 0;
573out:
574 handle_failed_inode(inode);
575 return err;
576}
577
578static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
579 umode_t mode, struct inode **whiteout)
580{
581 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
582 struct inode *inode;
583 int err;
584
585 inode = f2fs_new_inode(dir, mode);
586 if (IS_ERR(inode))
587 return PTR_ERR(inode);
588
589 if (whiteout) {
590 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
591 inode->i_op = &f2fs_special_inode_operations;
592 } else {
593 inode->i_op = &f2fs_file_inode_operations;
594 inode->i_fop = &f2fs_file_operations;
595 inode->i_mapping->a_ops = &f2fs_dblock_aops;
596 }
597
598 f2fs_balance_fs(sbi, true);
599
600 f2fs_lock_op(sbi);
601 err = acquire_orphan_inode(sbi);
602 if (err)
603 goto out;
604
605 err = f2fs_do_tmpfile(inode, dir);
606 if (err)
607 goto release_out;
608
609 /*
610 * add this non-linked tmpfile to orphan list, in this way we could
611 * remove all unused data of tmpfile after abnormal power-off.
612 */
613 add_orphan_inode(inode);
614 alloc_nid_done(sbi, inode->i_ino);
615
616 if (whiteout) {
617 f2fs_i_links_write(inode, false);
618 *whiteout = inode;
619 } else {
620 d_tmpfile(dentry, inode);
621 }
622 /* link_count was changed by d_tmpfile as well. */
623 f2fs_unlock_op(sbi);
624 unlock_new_inode(inode);
625 return 0;
626
627release_out:
628 release_orphan_inode(sbi);
629out:
630 handle_failed_inode(inode);
631 return err;
632}
633
634static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
635{
636 if (f2fs_encrypted_inode(dir)) {
637 int err = fscrypt_get_encryption_info(dir);
638 if (err)
639 return err;
640 }
641
642 return __f2fs_tmpfile(dir, dentry, mode, NULL);
643}
644
645static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
646{
647 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
648}
649
650static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
651 struct inode *new_dir, struct dentry *new_dentry,
652 unsigned int flags)
653{
654 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
655 struct inode *old_inode = d_inode(old_dentry);
656 struct inode *new_inode = d_inode(new_dentry);
657 struct inode *whiteout = NULL;
658 struct page *old_dir_page;
659 struct page *old_page, *new_page = NULL;
660 struct f2fs_dir_entry *old_dir_entry = NULL;
661 struct f2fs_dir_entry *old_entry;
662 struct f2fs_dir_entry *new_entry;
663 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
664 int err = -ENOENT;
665
666 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
667 !fscrypt_has_permitted_context(new_dir, old_inode)) {
668 err = -EPERM;
669 goto out;
670 }
671
672 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
673 if (!old_entry) {
674 if (IS_ERR(old_page))
675 err = PTR_ERR(old_page);
676 goto out;
677 }
678
679 if (S_ISDIR(old_inode->i_mode)) {
680 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
681 if (!old_dir_entry) {
682 if (IS_ERR(old_dir_page))
683 err = PTR_ERR(old_dir_page);
684 goto out_old;
685 }
686 }
687
688 if (flags & RENAME_WHITEOUT) {
689 err = f2fs_create_whiteout(old_dir, &whiteout);
690 if (err)
691 goto out_dir;
692 }
693
694 if (new_inode) {
695
696 err = -ENOTEMPTY;
697 if (old_dir_entry && !f2fs_empty_dir(new_inode))
698 goto out_whiteout;
699
700 err = -ENOENT;
701 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
702 &new_page);
703 if (!new_entry) {
704 if (IS_ERR(new_page))
705 err = PTR_ERR(new_page);
706 goto out_whiteout;
707 }
708
709 f2fs_balance_fs(sbi, true);
710
711 f2fs_lock_op(sbi);
712
713 err = acquire_orphan_inode(sbi);
714 if (err)
715 goto put_out_dir;
716
717 err = update_dent_inode(old_inode, new_inode,
718 &new_dentry->d_name);
719 if (err) {
720 release_orphan_inode(sbi);
721 goto put_out_dir;
722 }
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 if (new_inode && file_enc_name(new_inode))
777 file_set_enc_name(old_inode);
778 up_write(&F2FS_I(old_inode)->i_sem);
779
780 old_inode->i_ctime = current_time(old_inode);
781 f2fs_mark_inode_dirty_sync(old_inode, false);
782
783 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
784
785 if (whiteout) {
786 whiteout->i_state |= I_LINKABLE;
787 set_inode_flag(whiteout, FI_INC_LINK);
788 err = f2fs_add_link(old_dentry, whiteout);
789 if (err)
790 goto put_out_dir;
791 whiteout->i_state &= ~I_LINKABLE;
792 iput(whiteout);
793 }
794
795 if (old_dir_entry) {
796 if (old_dir != new_dir && !whiteout) {
797 f2fs_set_link(old_inode, old_dir_entry,
798 old_dir_page, new_dir);
799 } else {
800 f2fs_dentry_kunmap(old_inode, old_dir_page);
801 f2fs_put_page(old_dir_page, 0);
802 }
803 f2fs_i_links_write(old_dir, false);
804 }
805
806 f2fs_unlock_op(sbi);
807
808 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
809 f2fs_sync_fs(sbi->sb, 1);
810 return 0;
811
812put_out_dir:
813 f2fs_unlock_op(sbi);
814 if (new_page) {
815 f2fs_dentry_kunmap(new_dir, new_page);
816 f2fs_put_page(new_page, 0);
817 }
818out_whiteout:
819 if (whiteout)
820 iput(whiteout);
821out_dir:
822 if (old_dir_entry) {
823 f2fs_dentry_kunmap(old_inode, old_dir_page);
824 f2fs_put_page(old_dir_page, 0);
825 }
826out_old:
827 f2fs_dentry_kunmap(old_dir, old_page);
828 f2fs_put_page(old_page, 0);
829out:
830 return err;
831}
832
833static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
834 struct inode *new_dir, struct dentry *new_dentry)
835{
836 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
837 struct inode *old_inode = d_inode(old_dentry);
838 struct inode *new_inode = d_inode(new_dentry);
839 struct page *old_dir_page, *new_dir_page;
840 struct page *old_page, *new_page;
841 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
842 struct f2fs_dir_entry *old_entry, *new_entry;
843 int old_nlink = 0, new_nlink = 0;
844 int err = -ENOENT;
845
846 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
847 (old_dir != new_dir) &&
848 (!fscrypt_has_permitted_context(new_dir, old_inode) ||
849 !fscrypt_has_permitted_context(old_dir, new_inode)))
850 return -EPERM;
851
852 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
853 if (!old_entry) {
854 if (IS_ERR(old_page))
855 err = PTR_ERR(old_page);
856 goto out;
857 }
858
859 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
860 if (!new_entry) {
861 if (IS_ERR(new_page))
862 err = PTR_ERR(new_page);
863 goto out_old;
864 }
865
866 /* prepare for updating ".." directory entry info later */
867 if (old_dir != new_dir) {
868 if (S_ISDIR(old_inode->i_mode)) {
869 old_dir_entry = f2fs_parent_dir(old_inode,
870 &old_dir_page);
871 if (!old_dir_entry) {
872 if (IS_ERR(old_dir_page))
873 err = PTR_ERR(old_dir_page);
874 goto out_new;
875 }
876 }
877
878 if (S_ISDIR(new_inode->i_mode)) {
879 new_dir_entry = f2fs_parent_dir(new_inode,
880 &new_dir_page);
881 if (!new_dir_entry) {
882 if (IS_ERR(new_dir_page))
883 err = PTR_ERR(new_dir_page);
884 goto out_old_dir;
885 }
886 }
887 }
888
889 /*
890 * If cross rename between file and directory those are not
891 * in the same directory, we will inc nlink of file's parent
892 * later, so we should check upper boundary of its nlink.
893 */
894 if ((!old_dir_entry || !new_dir_entry) &&
895 old_dir_entry != new_dir_entry) {
896 old_nlink = old_dir_entry ? -1 : 1;
897 new_nlink = -old_nlink;
898 err = -EMLINK;
899 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
900 (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
901 goto out_new_dir;
902 }
903
904 f2fs_balance_fs(sbi, true);
905
906 f2fs_lock_op(sbi);
907
908 err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
909 if (err)
910 goto out_unlock;
911 if (file_enc_name(new_inode))
912 file_set_enc_name(old_inode);
913
914 err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
915 if (err)
916 goto out_undo;
917 if (file_enc_name(old_inode))
918 file_set_enc_name(new_inode);
919
920 /* update ".." directory entry info of old dentry */
921 if (old_dir_entry)
922 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
923
924 /* update ".." directory entry info of new dentry */
925 if (new_dir_entry)
926 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
927
928 /* update directory entry info of old dir inode */
929 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
930
931 down_write(&F2FS_I(old_inode)->i_sem);
932 file_lost_pino(old_inode);
933 up_write(&F2FS_I(old_inode)->i_sem);
934
935 old_dir->i_ctime = current_time(old_dir);
936 if (old_nlink) {
937 down_write(&F2FS_I(old_dir)->i_sem);
938 f2fs_i_links_write(old_dir, old_nlink > 0);
939 up_write(&F2FS_I(old_dir)->i_sem);
940 }
941 f2fs_mark_inode_dirty_sync(old_dir, false);
942
943 /* update directory entry info of new dir inode */
944 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
945
946 down_write(&F2FS_I(new_inode)->i_sem);
947 file_lost_pino(new_inode);
948 up_write(&F2FS_I(new_inode)->i_sem);
949
950 new_dir->i_ctime = current_time(new_dir);
951 if (new_nlink) {
952 down_write(&F2FS_I(new_dir)->i_sem);
953 f2fs_i_links_write(new_dir, new_nlink > 0);
954 up_write(&F2FS_I(new_dir)->i_sem);
955 }
956 f2fs_mark_inode_dirty_sync(new_dir, false);
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;
963out_undo:
964 /*
965 * Still we may fail to recover name info of f2fs_inode here
966 * Drop it, once its name is set as encrypted
967 */
968 update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
969out_unlock:
970 f2fs_unlock_op(sbi);
971out_new_dir:
972 if (new_dir_entry) {
973 f2fs_dentry_kunmap(new_inode, new_dir_page);
974 f2fs_put_page(new_dir_page, 0);
975 }
976out_old_dir:
977 if (old_dir_entry) {
978 f2fs_dentry_kunmap(old_inode, old_dir_page);
979 f2fs_put_page(old_dir_page, 0);
980 }
981out_new:
982 f2fs_dentry_kunmap(new_dir, new_page);
983 f2fs_put_page(new_page, 0);
984out_old:
985 f2fs_dentry_kunmap(old_dir, old_page);
986 f2fs_put_page(old_page, 0);
987out:
988 return err;
989}
990
991static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
992 struct inode *new_dir, struct dentry *new_dentry,
993 unsigned int flags)
994{
995 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
996 return -EINVAL;
997
998 if (flags & RENAME_EXCHANGE) {
999 return f2fs_cross_rename(old_dir, old_dentry,
1000 new_dir, new_dentry);
1001 }
1002 /*
1003 * VFS has already handled the new dentry existence case,
1004 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1005 */
1006 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1007}
1008
1009static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1010 struct inode *inode,
1011 struct delayed_call *done)
1012{
1013 struct page *cpage = NULL;
1014 char *caddr, *paddr = NULL;
1015 struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1016 struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1017 struct fscrypt_symlink_data *sd;
1018 u32 max_size = inode->i_sb->s_blocksize;
1019 int res;
1020
1021 if (!dentry)
1022 return ERR_PTR(-ECHILD);
1023
1024 res = fscrypt_get_encryption_info(inode);
1025 if (res)
1026 return ERR_PTR(res);
1027
1028 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1029 if (IS_ERR(cpage))
1030 return ERR_CAST(cpage);
1031 caddr = page_address(cpage);
1032
1033 /* Symlink is encrypted */
1034 sd = (struct fscrypt_symlink_data *)caddr;
1035 cstr.name = sd->encrypted_path;
1036 cstr.len = le16_to_cpu(sd->len);
1037
1038 /* this is broken symlink case */
1039 if (unlikely(cstr.len == 0)) {
1040 res = -ENOENT;
1041 goto errout;
1042 }
1043
1044 if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1045 /* Symlink data on the disk is corrupted */
1046 res = -EIO;
1047 goto errout;
1048 }
1049 res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1050 if (res)
1051 goto errout;
1052
1053 res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1054 if (res)
1055 goto errout;
1056
1057 /* this is broken symlink case */
1058 if (unlikely(pstr.name[0] == 0)) {
1059 res = -ENOENT;
1060 goto errout;
1061 }
1062
1063 paddr = pstr.name;
1064
1065 /* Null-terminate the name */
1066 paddr[pstr.len] = '\0';
1067
1068 put_page(cpage);
1069 set_delayed_call(done, kfree_link, paddr);
1070 return paddr;
1071errout:
1072 fscrypt_fname_free_buffer(&pstr);
1073 put_page(cpage);
1074 return ERR_PTR(res);
1075}
1076
1077const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1078 .get_link = f2fs_encrypted_get_link,
1079 .getattr = f2fs_getattr,
1080 .setattr = f2fs_setattr,
1081#ifdef CONFIG_F2FS_FS_XATTR
1082 .listxattr = f2fs_listxattr,
1083#endif
1084};
1085
1086const struct inode_operations f2fs_dir_inode_operations = {
1087 .create = f2fs_create,
1088 .lookup = f2fs_lookup,
1089 .link = f2fs_link,
1090 .unlink = f2fs_unlink,
1091 .symlink = f2fs_symlink,
1092 .mkdir = f2fs_mkdir,
1093 .rmdir = f2fs_rmdir,
1094 .mknod = f2fs_mknod,
1095 .rename = f2fs_rename2,
1096 .tmpfile = f2fs_tmpfile,
1097 .getattr = f2fs_getattr,
1098 .setattr = f2fs_setattr,
1099 .get_acl = f2fs_get_acl,
1100 .set_acl = f2fs_set_acl,
1101#ifdef CONFIG_F2FS_FS_XATTR
1102 .listxattr = f2fs_listxattr,
1103#endif
1104};
1105
1106const struct inode_operations f2fs_symlink_inode_operations = {
1107 .get_link = f2fs_get_link,
1108 .getattr = f2fs_getattr,
1109 .setattr = f2fs_setattr,
1110#ifdef CONFIG_F2FS_FS_XATTR
1111 .listxattr = f2fs_listxattr,
1112#endif
1113};
1114
1115const struct inode_operations f2fs_special_inode_operations = {
1116 .getattr = f2fs_getattr,
1117 .setattr = f2fs_setattr,
1118 .get_acl = f2fs_get_acl,
1119 .set_acl = f2fs_set_acl,
1120#ifdef CONFIG_F2FS_FS_XATTR
1121 .listxattr = f2fs_listxattr,
1122#endif
1123};