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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};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * fs/f2fs/namei.c
4 *
5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 * http://www.samsung.com/
7 */
8#include <linux/fs.h>
9#include <linux/f2fs_fs.h>
10#include <linux/pagemap.h>
11#include <linux/sched.h>
12#include <linux/ctype.h>
13#include <linux/random.h>
14#include <linux/dcache.h>
15#include <linux/namei.h>
16#include <linux/quotaops.h>
17
18#include "f2fs.h"
19#include "node.h"
20#include "segment.h"
21#include "xattr.h"
22#include "acl.h"
23#include <trace/events/f2fs.h>
24
25static inline bool is_extension_exist(const unsigned char *s, const char *sub,
26 bool tmp_ext, bool tmp_dot)
27{
28 size_t slen = strlen(s);
29 size_t sublen = strlen(sub);
30 int i;
31
32 if (sublen == 1 && *sub == '*')
33 return true;
34
35 /*
36 * filename format of multimedia file should be defined as:
37 * "filename + '.' + extension + (optional: '.' + temp extension)".
38 */
39 if (slen < sublen + 2)
40 return false;
41
42 if (!tmp_ext) {
43 /* file has no temp extension */
44 if (s[slen - sublen - 1] != '.')
45 return false;
46 return !strncasecmp(s + slen - sublen, sub, sublen);
47 }
48
49 for (i = 1; i < slen - sublen; i++) {
50 if (s[i] != '.')
51 continue;
52 if (!strncasecmp(s + i + 1, sub, sublen)) {
53 if (!tmp_dot)
54 return true;
55 if (i == slen - sublen - 1 || s[i + 1 + sublen] == '.')
56 return true;
57 }
58 }
59
60 return false;
61}
62
63static inline bool is_temperature_extension(const unsigned char *s, const char *sub)
64{
65 return is_extension_exist(s, sub, true, false);
66}
67
68static inline bool is_compress_extension(const unsigned char *s, const char *sub)
69{
70 return is_extension_exist(s, sub, true, true);
71}
72
73int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
74 bool hot, bool set)
75{
76 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
77 int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
78 int hot_count = sbi->raw_super->hot_ext_count;
79 int total_count = cold_count + hot_count;
80 int start, count;
81 int i;
82
83 if (set) {
84 if (total_count == F2FS_MAX_EXTENSION)
85 return -EINVAL;
86 } else {
87 if (!hot && !cold_count)
88 return -EINVAL;
89 if (hot && !hot_count)
90 return -EINVAL;
91 }
92
93 if (hot) {
94 start = cold_count;
95 count = total_count;
96 } else {
97 start = 0;
98 count = cold_count;
99 }
100
101 for (i = start; i < count; i++) {
102 if (strcmp(name, extlist[i]))
103 continue;
104
105 if (set)
106 return -EINVAL;
107
108 memcpy(extlist[i], extlist[i + 1],
109 F2FS_EXTENSION_LEN * (total_count - i - 1));
110 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
111 if (hot)
112 sbi->raw_super->hot_ext_count = hot_count - 1;
113 else
114 sbi->raw_super->extension_count =
115 cpu_to_le32(cold_count - 1);
116 return 0;
117 }
118
119 if (!set)
120 return -EINVAL;
121
122 if (hot) {
123 memcpy(extlist[count], name, strlen(name));
124 sbi->raw_super->hot_ext_count = hot_count + 1;
125 } else {
126 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
127
128 memcpy(buf, &extlist[cold_count],
129 F2FS_EXTENSION_LEN * hot_count);
130 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
131 memcpy(extlist[cold_count], name, strlen(name));
132 memcpy(&extlist[cold_count + 1], buf,
133 F2FS_EXTENSION_LEN * hot_count);
134 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
135 }
136 return 0;
137}
138
139static void set_compress_new_inode(struct f2fs_sb_info *sbi, struct inode *dir,
140 struct inode *inode, const unsigned char *name)
141{
142 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
143 unsigned char (*noext)[F2FS_EXTENSION_LEN] =
144 F2FS_OPTION(sbi).noextensions;
145 unsigned char (*ext)[F2FS_EXTENSION_LEN] = F2FS_OPTION(sbi).extensions;
146 unsigned char ext_cnt = F2FS_OPTION(sbi).compress_ext_cnt;
147 unsigned char noext_cnt = F2FS_OPTION(sbi).nocompress_ext_cnt;
148 int i, cold_count, hot_count;
149
150 if (!f2fs_sb_has_compression(sbi))
151 return;
152
153 if (S_ISDIR(inode->i_mode))
154 goto inherit_comp;
155
156 /* This name comes only from normal files. */
157 if (!name)
158 return;
159
160 /* Don't compress hot files. */
161 f2fs_down_read(&sbi->sb_lock);
162 cold_count = le32_to_cpu(sbi->raw_super->extension_count);
163 hot_count = sbi->raw_super->hot_ext_count;
164 for (i = cold_count; i < cold_count + hot_count; i++)
165 if (is_temperature_extension(name, extlist[i]))
166 break;
167 f2fs_up_read(&sbi->sb_lock);
168 if (i < (cold_count + hot_count))
169 return;
170
171 /* Don't compress unallowed extension. */
172 for (i = 0; i < noext_cnt; i++)
173 if (is_compress_extension(name, noext[i]))
174 return;
175
176 /* Compress wanting extension. */
177 for (i = 0; i < ext_cnt; i++) {
178 if (is_compress_extension(name, ext[i])) {
179 set_compress_context(inode);
180 return;
181 }
182 }
183inherit_comp:
184 /* Inherit the {no-}compression flag in directory */
185 if (F2FS_I(dir)->i_flags & F2FS_NOCOMP_FL) {
186 F2FS_I(inode)->i_flags |= F2FS_NOCOMP_FL;
187 f2fs_mark_inode_dirty_sync(inode, true);
188 } else if (F2FS_I(dir)->i_flags & F2FS_COMPR_FL) {
189 set_compress_context(inode);
190 }
191}
192
193/*
194 * Set file's temperature for hot/cold data separation
195 */
196static void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
197 const unsigned char *name)
198{
199 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
200 int i, cold_count, hot_count;
201
202 f2fs_down_read(&sbi->sb_lock);
203 cold_count = le32_to_cpu(sbi->raw_super->extension_count);
204 hot_count = sbi->raw_super->hot_ext_count;
205 for (i = 0; i < cold_count + hot_count; i++)
206 if (is_temperature_extension(name, extlist[i]))
207 break;
208 f2fs_up_read(&sbi->sb_lock);
209
210 if (i == cold_count + hot_count)
211 return;
212
213 if (i < cold_count)
214 file_set_cold(inode);
215 else
216 file_set_hot(inode);
217}
218
219static struct inode *f2fs_new_inode(struct mnt_idmap *idmap,
220 struct inode *dir, umode_t mode,
221 const char *name)
222{
223 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
224 struct f2fs_inode_info *fi;
225 nid_t ino;
226 struct inode *inode;
227 bool nid_free = false;
228 bool encrypt = false;
229 int xattr_size = 0;
230 int err;
231
232 inode = new_inode(dir->i_sb);
233 if (!inode)
234 return ERR_PTR(-ENOMEM);
235
236 if (!f2fs_alloc_nid(sbi, &ino)) {
237 err = -ENOSPC;
238 goto fail;
239 }
240
241 nid_free = true;
242
243 inode_init_owner(idmap, inode, dir, mode);
244
245 fi = F2FS_I(inode);
246 inode->i_ino = ino;
247 inode->i_blocks = 0;
248 simple_inode_init_ts(inode);
249 fi->i_crtime = inode_get_mtime(inode);
250 inode->i_generation = get_random_u32();
251
252 if (S_ISDIR(inode->i_mode))
253 fi->i_current_depth = 1;
254
255 err = insert_inode_locked(inode);
256 if (err) {
257 err = -EINVAL;
258 goto fail;
259 }
260
261 if (f2fs_sb_has_project_quota(sbi) &&
262 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
263 fi->i_projid = F2FS_I(dir)->i_projid;
264 else
265 fi->i_projid = make_kprojid(&init_user_ns,
266 F2FS_DEF_PROJID);
267
268 err = fscrypt_prepare_new_inode(dir, inode, &encrypt);
269 if (err)
270 goto fail_drop;
271
272 err = f2fs_dquot_initialize(inode);
273 if (err)
274 goto fail_drop;
275
276 set_inode_flag(inode, FI_NEW_INODE);
277
278 if (encrypt)
279 f2fs_set_encrypted_inode(inode);
280
281 if (f2fs_sb_has_extra_attr(sbi)) {
282 set_inode_flag(inode, FI_EXTRA_ATTR);
283 fi->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
284 }
285
286 if (test_opt(sbi, INLINE_XATTR))
287 set_inode_flag(inode, FI_INLINE_XATTR);
288
289 if (f2fs_may_inline_dentry(inode))
290 set_inode_flag(inode, FI_INLINE_DENTRY);
291
292 if (f2fs_sb_has_flexible_inline_xattr(sbi)) {
293 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
294 if (f2fs_has_inline_xattr(inode))
295 xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
296 /* Otherwise, will be 0 */
297 } else if (f2fs_has_inline_xattr(inode) ||
298 f2fs_has_inline_dentry(inode)) {
299 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
300 }
301 fi->i_inline_xattr_size = xattr_size;
302
303 fi->i_flags =
304 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
305
306 if (S_ISDIR(inode->i_mode))
307 fi->i_flags |= F2FS_INDEX_FL;
308
309 if (fi->i_flags & F2FS_PROJINHERIT_FL)
310 set_inode_flag(inode, FI_PROJ_INHERIT);
311
312 /* Check compression first. */
313 set_compress_new_inode(sbi, dir, inode, name);
314
315 /* Should enable inline_data after compression set */
316 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
317 set_inode_flag(inode, FI_INLINE_DATA);
318
319 if (name && !test_opt(sbi, DISABLE_EXT_IDENTIFY))
320 set_file_temperature(sbi, inode, name);
321
322 stat_inc_inline_xattr(inode);
323 stat_inc_inline_inode(inode);
324 stat_inc_inline_dir(inode);
325
326 f2fs_set_inode_flags(inode);
327
328 f2fs_init_extent_tree(inode);
329
330 trace_f2fs_new_inode(inode, 0);
331 return inode;
332
333fail:
334 trace_f2fs_new_inode(inode, err);
335 make_bad_inode(inode);
336 if (nid_free)
337 set_inode_flag(inode, FI_FREE_NID);
338 iput(inode);
339 return ERR_PTR(err);
340fail_drop:
341 trace_f2fs_new_inode(inode, err);
342 dquot_drop(inode);
343 inode->i_flags |= S_NOQUOTA;
344 if (nid_free)
345 set_inode_flag(inode, FI_FREE_NID);
346 clear_nlink(inode);
347 unlock_new_inode(inode);
348 iput(inode);
349 return ERR_PTR(err);
350}
351
352static int f2fs_create(struct mnt_idmap *idmap, struct inode *dir,
353 struct dentry *dentry, umode_t mode, bool excl)
354{
355 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
356 struct inode *inode;
357 nid_t ino = 0;
358 int err;
359
360 if (unlikely(f2fs_cp_error(sbi)))
361 return -EIO;
362 if (!f2fs_is_checkpoint_ready(sbi))
363 return -ENOSPC;
364
365 err = f2fs_dquot_initialize(dir);
366 if (err)
367 return err;
368
369 inode = f2fs_new_inode(idmap, dir, mode, dentry->d_name.name);
370 if (IS_ERR(inode))
371 return PTR_ERR(inode);
372
373 inode->i_op = &f2fs_file_inode_operations;
374 inode->i_fop = &f2fs_file_operations;
375 inode->i_mapping->a_ops = &f2fs_dblock_aops;
376 ino = inode->i_ino;
377
378 f2fs_lock_op(sbi);
379 err = f2fs_add_link(dentry, inode);
380 if (err)
381 goto out;
382 f2fs_unlock_op(sbi);
383
384 f2fs_alloc_nid_done(sbi, ino);
385
386 d_instantiate_new(dentry, inode);
387
388 if (IS_DIRSYNC(dir))
389 f2fs_sync_fs(sbi->sb, 1);
390
391 f2fs_balance_fs(sbi, true);
392 return 0;
393out:
394 f2fs_handle_failed_inode(inode);
395 return err;
396}
397
398static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
399 struct dentry *dentry)
400{
401 struct inode *inode = d_inode(old_dentry);
402 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
403 int err;
404
405 if (unlikely(f2fs_cp_error(sbi)))
406 return -EIO;
407 if (!f2fs_is_checkpoint_ready(sbi))
408 return -ENOSPC;
409
410 err = fscrypt_prepare_link(old_dentry, dir, dentry);
411 if (err)
412 return err;
413
414 if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
415 (!projid_eq(F2FS_I(dir)->i_projid,
416 F2FS_I(old_dentry->d_inode)->i_projid)))
417 return -EXDEV;
418
419 err = f2fs_dquot_initialize(dir);
420 if (err)
421 return err;
422
423 f2fs_balance_fs(sbi, true);
424
425 inode_set_ctime_current(inode);
426 ihold(inode);
427
428 set_inode_flag(inode, FI_INC_LINK);
429 f2fs_lock_op(sbi);
430 err = f2fs_add_link(dentry, inode);
431 if (err)
432 goto out;
433 f2fs_unlock_op(sbi);
434
435 d_instantiate(dentry, inode);
436
437 if (IS_DIRSYNC(dir))
438 f2fs_sync_fs(sbi->sb, 1);
439 return 0;
440out:
441 clear_inode_flag(inode, FI_INC_LINK);
442 iput(inode);
443 f2fs_unlock_op(sbi);
444 return err;
445}
446
447struct dentry *f2fs_get_parent(struct dentry *child)
448{
449 struct page *page;
450 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot_name, &page);
451
452 if (!ino) {
453 if (IS_ERR(page))
454 return ERR_CAST(page);
455 return ERR_PTR(-ENOENT);
456 }
457 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
458}
459
460static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
461 unsigned int flags)
462{
463 struct inode *inode = NULL;
464 struct f2fs_dir_entry *de;
465 struct page *page;
466 struct dentry *new;
467 nid_t ino = -1;
468 int err = 0;
469 struct f2fs_filename fname;
470
471 trace_f2fs_lookup_start(dir, dentry, flags);
472
473 if (dentry->d_name.len > F2FS_NAME_LEN) {
474 err = -ENAMETOOLONG;
475 goto out;
476 }
477
478 err = f2fs_prepare_lookup(dir, dentry, &fname);
479 if (err == -ENOENT)
480 goto out_splice;
481 if (err)
482 goto out;
483 de = __f2fs_find_entry(dir, &fname, &page);
484 f2fs_free_filename(&fname);
485
486 if (!de) {
487 if (IS_ERR(page)) {
488 err = PTR_ERR(page);
489 goto out;
490 }
491 err = -ENOENT;
492 goto out_splice;
493 }
494
495 ino = le32_to_cpu(de->ino);
496 f2fs_put_page(page, 0);
497
498 inode = f2fs_iget(dir->i_sb, ino);
499 if (IS_ERR(inode)) {
500 err = PTR_ERR(inode);
501 goto out;
502 }
503
504 if (IS_ENCRYPTED(dir) &&
505 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
506 !fscrypt_has_permitted_context(dir, inode)) {
507 f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu",
508 dir->i_ino, inode->i_ino);
509 err = -EPERM;
510 goto out_iput;
511 }
512out_splice:
513 if (IS_ENABLED(CONFIG_UNICODE) && !inode && IS_CASEFOLDED(dir)) {
514 /* Eventually we want to call d_add_ci(dentry, NULL)
515 * for negative dentries in the encoding case as
516 * well. For now, prevent the negative dentry
517 * from being cached.
518 */
519 trace_f2fs_lookup_end(dir, dentry, ino, err);
520 return NULL;
521 }
522
523 new = d_splice_alias(inode, dentry);
524 trace_f2fs_lookup_end(dir, !IS_ERR_OR_NULL(new) ? new : dentry,
525 ino, IS_ERR(new) ? PTR_ERR(new) : err);
526 return new;
527out_iput:
528 iput(inode);
529out:
530 trace_f2fs_lookup_end(dir, dentry, ino, err);
531 return ERR_PTR(err);
532}
533
534static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
535{
536 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
537 struct inode *inode = d_inode(dentry);
538 struct f2fs_dir_entry *de;
539 struct page *page;
540 int err;
541
542 trace_f2fs_unlink_enter(dir, dentry);
543
544 if (unlikely(f2fs_cp_error(sbi))) {
545 err = -EIO;
546 goto fail;
547 }
548
549 err = f2fs_dquot_initialize(dir);
550 if (err)
551 goto fail;
552 err = f2fs_dquot_initialize(inode);
553 if (err)
554 goto fail;
555
556 de = f2fs_find_entry(dir, &dentry->d_name, &page);
557 if (!de) {
558 if (IS_ERR(page))
559 err = PTR_ERR(page);
560 goto fail;
561 }
562
563 f2fs_balance_fs(sbi, true);
564
565 f2fs_lock_op(sbi);
566 err = f2fs_acquire_orphan_inode(sbi);
567 if (err) {
568 f2fs_unlock_op(sbi);
569 f2fs_put_page(page, 0);
570 goto fail;
571 }
572 f2fs_delete_entry(de, page, dir, inode);
573 f2fs_unlock_op(sbi);
574
575 /* VFS negative dentries are incompatible with Encoding and
576 * Case-insensitiveness. Eventually we'll want avoid
577 * invalidating the dentries here, alongside with returning the
578 * negative dentries at f2fs_lookup(), when it is better
579 * supported by the VFS for the CI case.
580 */
581 if (IS_ENABLED(CONFIG_UNICODE) && IS_CASEFOLDED(dir))
582 d_invalidate(dentry);
583
584 if (IS_DIRSYNC(dir))
585 f2fs_sync_fs(sbi->sb, 1);
586fail:
587 trace_f2fs_unlink_exit(inode, err);
588 return err;
589}
590
591static const char *f2fs_get_link(struct dentry *dentry,
592 struct inode *inode,
593 struct delayed_call *done)
594{
595 const char *link = page_get_link(dentry, inode, done);
596
597 if (!IS_ERR(link) && !*link) {
598 /* this is broken symlink case */
599 do_delayed_call(done);
600 clear_delayed_call(done);
601 link = ERR_PTR(-ENOENT);
602 }
603 return link;
604}
605
606static int f2fs_symlink(struct mnt_idmap *idmap, struct inode *dir,
607 struct dentry *dentry, const char *symname)
608{
609 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
610 struct inode *inode;
611 size_t len = strlen(symname);
612 struct fscrypt_str disk_link;
613 int err;
614
615 if (unlikely(f2fs_cp_error(sbi)))
616 return -EIO;
617 if (!f2fs_is_checkpoint_ready(sbi))
618 return -ENOSPC;
619
620 err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
621 &disk_link);
622 if (err)
623 return err;
624
625 err = f2fs_dquot_initialize(dir);
626 if (err)
627 return err;
628
629 inode = f2fs_new_inode(idmap, dir, S_IFLNK | S_IRWXUGO, NULL);
630 if (IS_ERR(inode))
631 return PTR_ERR(inode);
632
633 if (IS_ENCRYPTED(inode))
634 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
635 else
636 inode->i_op = &f2fs_symlink_inode_operations;
637 inode_nohighmem(inode);
638 inode->i_mapping->a_ops = &f2fs_dblock_aops;
639
640 f2fs_lock_op(sbi);
641 err = f2fs_add_link(dentry, inode);
642 if (err)
643 goto out_f2fs_handle_failed_inode;
644 f2fs_unlock_op(sbi);
645 f2fs_alloc_nid_done(sbi, inode->i_ino);
646
647 err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
648 if (err)
649 goto err_out;
650
651 err = page_symlink(inode, disk_link.name, disk_link.len);
652
653err_out:
654 d_instantiate_new(dentry, inode);
655
656 /*
657 * Let's flush symlink data in order to avoid broken symlink as much as
658 * possible. Nevertheless, fsyncing is the best way, but there is no
659 * way to get a file descriptor in order to flush that.
660 *
661 * Note that, it needs to do dir->fsync to make this recoverable.
662 * If the symlink path is stored into inline_data, there is no
663 * performance regression.
664 */
665 if (!err) {
666 filemap_write_and_wait_range(inode->i_mapping, 0,
667 disk_link.len - 1);
668
669 if (IS_DIRSYNC(dir))
670 f2fs_sync_fs(sbi->sb, 1);
671 } else {
672 f2fs_unlink(dir, dentry);
673 }
674
675 f2fs_balance_fs(sbi, true);
676 goto out_free_encrypted_link;
677
678out_f2fs_handle_failed_inode:
679 f2fs_handle_failed_inode(inode);
680out_free_encrypted_link:
681 if (disk_link.name != (unsigned char *)symname)
682 kfree(disk_link.name);
683 return err;
684}
685
686static int f2fs_mkdir(struct mnt_idmap *idmap, struct inode *dir,
687 struct dentry *dentry, umode_t mode)
688{
689 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
690 struct inode *inode;
691 int err;
692
693 if (unlikely(f2fs_cp_error(sbi)))
694 return -EIO;
695
696 err = f2fs_dquot_initialize(dir);
697 if (err)
698 return err;
699
700 inode = f2fs_new_inode(idmap, dir, S_IFDIR | mode, NULL);
701 if (IS_ERR(inode))
702 return PTR_ERR(inode);
703
704 inode->i_op = &f2fs_dir_inode_operations;
705 inode->i_fop = &f2fs_dir_operations;
706 inode->i_mapping->a_ops = &f2fs_dblock_aops;
707 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
708
709 set_inode_flag(inode, FI_INC_LINK);
710 f2fs_lock_op(sbi);
711 err = f2fs_add_link(dentry, inode);
712 if (err)
713 goto out_fail;
714 f2fs_unlock_op(sbi);
715
716 f2fs_alloc_nid_done(sbi, inode->i_ino);
717
718 d_instantiate_new(dentry, inode);
719
720 if (IS_DIRSYNC(dir))
721 f2fs_sync_fs(sbi->sb, 1);
722
723 f2fs_balance_fs(sbi, true);
724 return 0;
725
726out_fail:
727 clear_inode_flag(inode, FI_INC_LINK);
728 f2fs_handle_failed_inode(inode);
729 return err;
730}
731
732static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
733{
734 struct inode *inode = d_inode(dentry);
735
736 if (f2fs_empty_dir(inode))
737 return f2fs_unlink(dir, dentry);
738 return -ENOTEMPTY;
739}
740
741static int f2fs_mknod(struct mnt_idmap *idmap, struct inode *dir,
742 struct dentry *dentry, umode_t mode, dev_t rdev)
743{
744 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
745 struct inode *inode;
746 int err = 0;
747
748 if (unlikely(f2fs_cp_error(sbi)))
749 return -EIO;
750 if (!f2fs_is_checkpoint_ready(sbi))
751 return -ENOSPC;
752
753 err = f2fs_dquot_initialize(dir);
754 if (err)
755 return err;
756
757 inode = f2fs_new_inode(idmap, dir, mode, NULL);
758 if (IS_ERR(inode))
759 return PTR_ERR(inode);
760
761 init_special_inode(inode, inode->i_mode, rdev);
762 inode->i_op = &f2fs_special_inode_operations;
763
764 f2fs_lock_op(sbi);
765 err = f2fs_add_link(dentry, inode);
766 if (err)
767 goto out;
768 f2fs_unlock_op(sbi);
769
770 f2fs_alloc_nid_done(sbi, inode->i_ino);
771
772 d_instantiate_new(dentry, inode);
773
774 if (IS_DIRSYNC(dir))
775 f2fs_sync_fs(sbi->sb, 1);
776
777 f2fs_balance_fs(sbi, true);
778 return 0;
779out:
780 f2fs_handle_failed_inode(inode);
781 return err;
782}
783
784static int __f2fs_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
785 struct file *file, umode_t mode, bool is_whiteout,
786 struct inode **new_inode, struct f2fs_filename *fname)
787{
788 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
789 struct inode *inode;
790 int err;
791
792 err = f2fs_dquot_initialize(dir);
793 if (err)
794 return err;
795
796 inode = f2fs_new_inode(idmap, dir, mode, NULL);
797 if (IS_ERR(inode))
798 return PTR_ERR(inode);
799
800 if (is_whiteout) {
801 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
802 inode->i_op = &f2fs_special_inode_operations;
803 } else {
804 inode->i_op = &f2fs_file_inode_operations;
805 inode->i_fop = &f2fs_file_operations;
806 inode->i_mapping->a_ops = &f2fs_dblock_aops;
807 }
808
809 f2fs_lock_op(sbi);
810 err = f2fs_acquire_orphan_inode(sbi);
811 if (err)
812 goto out;
813
814 err = f2fs_do_tmpfile(inode, dir, fname);
815 if (err)
816 goto release_out;
817
818 /*
819 * add this non-linked tmpfile to orphan list, in this way we could
820 * remove all unused data of tmpfile after abnormal power-off.
821 */
822 f2fs_add_orphan_inode(inode);
823 f2fs_alloc_nid_done(sbi, inode->i_ino);
824
825 if (is_whiteout) {
826 f2fs_i_links_write(inode, false);
827
828 spin_lock(&inode->i_lock);
829 inode->i_state |= I_LINKABLE;
830 spin_unlock(&inode->i_lock);
831 } else {
832 if (file)
833 d_tmpfile(file, inode);
834 else
835 f2fs_i_links_write(inode, false);
836 }
837 /* link_count was changed by d_tmpfile as well. */
838 f2fs_unlock_op(sbi);
839 unlock_new_inode(inode);
840
841 if (new_inode)
842 *new_inode = inode;
843
844 f2fs_balance_fs(sbi, true);
845 return 0;
846
847release_out:
848 f2fs_release_orphan_inode(sbi);
849out:
850 f2fs_handle_failed_inode(inode);
851 return err;
852}
853
854static int f2fs_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
855 struct file *file, umode_t mode)
856{
857 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
858 int err;
859
860 if (unlikely(f2fs_cp_error(sbi)))
861 return -EIO;
862 if (!f2fs_is_checkpoint_ready(sbi))
863 return -ENOSPC;
864
865 err = __f2fs_tmpfile(idmap, dir, file, mode, false, NULL, NULL);
866
867 return finish_open_simple(file, err);
868}
869
870static int f2fs_create_whiteout(struct mnt_idmap *idmap,
871 struct inode *dir, struct inode **whiteout,
872 struct f2fs_filename *fname)
873{
874 return __f2fs_tmpfile(idmap, dir, NULL, S_IFCHR | WHITEOUT_MODE,
875 true, whiteout, fname);
876}
877
878int f2fs_get_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
879 struct inode **new_inode)
880{
881 return __f2fs_tmpfile(idmap, dir, NULL, S_IFREG,
882 false, new_inode, NULL);
883}
884
885static int f2fs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
886 struct dentry *old_dentry, struct inode *new_dir,
887 struct dentry *new_dentry, unsigned int flags)
888{
889 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
890 struct inode *old_inode = d_inode(old_dentry);
891 struct inode *new_inode = d_inode(new_dentry);
892 struct inode *whiteout = NULL;
893 struct page *old_dir_page = NULL;
894 struct page *old_page, *new_page = NULL;
895 struct f2fs_dir_entry *old_dir_entry = NULL;
896 struct f2fs_dir_entry *old_entry;
897 struct f2fs_dir_entry *new_entry;
898 bool old_is_dir = S_ISDIR(old_inode->i_mode);
899 int err;
900
901 if (unlikely(f2fs_cp_error(sbi)))
902 return -EIO;
903 if (!f2fs_is_checkpoint_ready(sbi))
904 return -ENOSPC;
905
906 if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
907 (!projid_eq(F2FS_I(new_dir)->i_projid,
908 F2FS_I(old_dentry->d_inode)->i_projid)))
909 return -EXDEV;
910
911 /*
912 * If new_inode is null, the below renaming flow will
913 * add a link in old_dir which can convert inline_dir.
914 * After then, if we failed to get the entry due to other
915 * reasons like ENOMEM, we had to remove the new entry.
916 * Instead of adding such the error handling routine, let's
917 * simply convert first here.
918 */
919 if (old_dir == new_dir && !new_inode) {
920 err = f2fs_try_convert_inline_dir(old_dir, new_dentry);
921 if (err)
922 return err;
923 }
924
925 if (flags & RENAME_WHITEOUT) {
926 struct f2fs_filename fname;
927
928 err = f2fs_setup_filename(old_dir, &old_dentry->d_name,
929 0, &fname);
930 if (err)
931 return err;
932
933 err = f2fs_create_whiteout(idmap, old_dir, &whiteout, &fname);
934 if (err)
935 return err;
936 }
937
938 err = f2fs_dquot_initialize(old_dir);
939 if (err)
940 goto out;
941
942 err = f2fs_dquot_initialize(new_dir);
943 if (err)
944 goto out;
945
946 if (new_inode) {
947 err = f2fs_dquot_initialize(new_inode);
948 if (err)
949 goto out;
950 }
951
952 err = -ENOENT;
953 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
954 if (!old_entry) {
955 if (IS_ERR(old_page))
956 err = PTR_ERR(old_page);
957 goto out;
958 }
959
960 if (old_is_dir && old_dir != new_dir) {
961 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
962 if (!old_dir_entry) {
963 if (IS_ERR(old_dir_page))
964 err = PTR_ERR(old_dir_page);
965 goto out_old;
966 }
967 }
968
969 if (new_inode) {
970
971 err = -ENOTEMPTY;
972 if (old_is_dir && !f2fs_empty_dir(new_inode))
973 goto out_dir;
974
975 err = -ENOENT;
976 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
977 &new_page);
978 if (!new_entry) {
979 if (IS_ERR(new_page))
980 err = PTR_ERR(new_page);
981 goto out_dir;
982 }
983
984 f2fs_balance_fs(sbi, true);
985
986 f2fs_lock_op(sbi);
987
988 err = f2fs_acquire_orphan_inode(sbi);
989 if (err)
990 goto put_out_dir;
991
992 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
993 new_page = NULL;
994
995 inode_set_ctime_current(new_inode);
996 f2fs_down_write(&F2FS_I(new_inode)->i_sem);
997 if (old_is_dir)
998 f2fs_i_links_write(new_inode, false);
999 f2fs_i_links_write(new_inode, false);
1000 f2fs_up_write(&F2FS_I(new_inode)->i_sem);
1001
1002 if (!new_inode->i_nlink)
1003 f2fs_add_orphan_inode(new_inode);
1004 else
1005 f2fs_release_orphan_inode(sbi);
1006 } else {
1007 f2fs_balance_fs(sbi, true);
1008
1009 f2fs_lock_op(sbi);
1010
1011 err = f2fs_add_link(new_dentry, old_inode);
1012 if (err) {
1013 f2fs_unlock_op(sbi);
1014 goto out_dir;
1015 }
1016
1017 if (old_is_dir)
1018 f2fs_i_links_write(new_dir, true);
1019 }
1020
1021 f2fs_down_write(&F2FS_I(old_inode)->i_sem);
1022 if (!old_is_dir || whiteout)
1023 file_lost_pino(old_inode);
1024 else
1025 /* adjust dir's i_pino to pass fsck check */
1026 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1027 f2fs_up_write(&F2FS_I(old_inode)->i_sem);
1028
1029 inode_set_ctime_current(old_inode);
1030 f2fs_mark_inode_dirty_sync(old_inode, false);
1031
1032 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
1033 old_page = NULL;
1034
1035 if (whiteout) {
1036 set_inode_flag(whiteout, FI_INC_LINK);
1037 err = f2fs_add_link(old_dentry, whiteout);
1038 if (err)
1039 goto put_out_dir;
1040
1041 spin_lock(&whiteout->i_lock);
1042 whiteout->i_state &= ~I_LINKABLE;
1043 spin_unlock(&whiteout->i_lock);
1044
1045 iput(whiteout);
1046 }
1047
1048 if (old_dir_entry)
1049 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1050 if (old_is_dir)
1051 f2fs_i_links_write(old_dir, false);
1052
1053 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1054 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1055 if (S_ISDIR(old_inode->i_mode))
1056 f2fs_add_ino_entry(sbi, old_inode->i_ino,
1057 TRANS_DIR_INO);
1058 }
1059
1060 f2fs_unlock_op(sbi);
1061
1062 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1063 f2fs_sync_fs(sbi->sb, 1);
1064
1065 f2fs_update_time(sbi, REQ_TIME);
1066 return 0;
1067
1068put_out_dir:
1069 f2fs_unlock_op(sbi);
1070 f2fs_put_page(new_page, 0);
1071out_dir:
1072 if (old_dir_entry)
1073 f2fs_put_page(old_dir_page, 0);
1074out_old:
1075 f2fs_put_page(old_page, 0);
1076out:
1077 iput(whiteout);
1078 return err;
1079}
1080
1081static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1082 struct inode *new_dir, struct dentry *new_dentry)
1083{
1084 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1085 struct inode *old_inode = d_inode(old_dentry);
1086 struct inode *new_inode = d_inode(new_dentry);
1087 struct page *old_dir_page, *new_dir_page;
1088 struct page *old_page, *new_page;
1089 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1090 struct f2fs_dir_entry *old_entry, *new_entry;
1091 int old_nlink = 0, new_nlink = 0;
1092 int err;
1093
1094 if (unlikely(f2fs_cp_error(sbi)))
1095 return -EIO;
1096 if (!f2fs_is_checkpoint_ready(sbi))
1097 return -ENOSPC;
1098
1099 if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1100 !projid_eq(F2FS_I(new_dir)->i_projid,
1101 F2FS_I(old_dentry->d_inode)->i_projid)) ||
1102 (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1103 !projid_eq(F2FS_I(old_dir)->i_projid,
1104 F2FS_I(new_dentry->d_inode)->i_projid)))
1105 return -EXDEV;
1106
1107 err = f2fs_dquot_initialize(old_dir);
1108 if (err)
1109 goto out;
1110
1111 err = f2fs_dquot_initialize(new_dir);
1112 if (err)
1113 goto out;
1114
1115 err = -ENOENT;
1116 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1117 if (!old_entry) {
1118 if (IS_ERR(old_page))
1119 err = PTR_ERR(old_page);
1120 goto out;
1121 }
1122
1123 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1124 if (!new_entry) {
1125 if (IS_ERR(new_page))
1126 err = PTR_ERR(new_page);
1127 goto out_old;
1128 }
1129
1130 /* prepare for updating ".." directory entry info later */
1131 if (old_dir != new_dir) {
1132 if (S_ISDIR(old_inode->i_mode)) {
1133 old_dir_entry = f2fs_parent_dir(old_inode,
1134 &old_dir_page);
1135 if (!old_dir_entry) {
1136 if (IS_ERR(old_dir_page))
1137 err = PTR_ERR(old_dir_page);
1138 goto out_new;
1139 }
1140 }
1141
1142 if (S_ISDIR(new_inode->i_mode)) {
1143 new_dir_entry = f2fs_parent_dir(new_inode,
1144 &new_dir_page);
1145 if (!new_dir_entry) {
1146 if (IS_ERR(new_dir_page))
1147 err = PTR_ERR(new_dir_page);
1148 goto out_old_dir;
1149 }
1150 }
1151 }
1152
1153 /*
1154 * If cross rename between file and directory those are not
1155 * in the same directory, we will inc nlink of file's parent
1156 * later, so we should check upper boundary of its nlink.
1157 */
1158 if ((!old_dir_entry || !new_dir_entry) &&
1159 old_dir_entry != new_dir_entry) {
1160 old_nlink = old_dir_entry ? -1 : 1;
1161 new_nlink = -old_nlink;
1162 err = -EMLINK;
1163 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1164 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1165 goto out_new_dir;
1166 }
1167
1168 f2fs_balance_fs(sbi, true);
1169
1170 f2fs_lock_op(sbi);
1171
1172 /* update ".." directory entry info of old dentry */
1173 if (old_dir_entry)
1174 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1175
1176 /* update ".." directory entry info of new dentry */
1177 if (new_dir_entry)
1178 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1179
1180 /* update directory entry info of old dir inode */
1181 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1182
1183 f2fs_down_write(&F2FS_I(old_inode)->i_sem);
1184 if (!old_dir_entry)
1185 file_lost_pino(old_inode);
1186 else
1187 /* adjust dir's i_pino to pass fsck check */
1188 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1189 f2fs_up_write(&F2FS_I(old_inode)->i_sem);
1190
1191 inode_set_ctime_current(old_dir);
1192 if (old_nlink) {
1193 f2fs_down_write(&F2FS_I(old_dir)->i_sem);
1194 f2fs_i_links_write(old_dir, old_nlink > 0);
1195 f2fs_up_write(&F2FS_I(old_dir)->i_sem);
1196 }
1197 f2fs_mark_inode_dirty_sync(old_dir, false);
1198
1199 /* update directory entry info of new dir inode */
1200 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1201
1202 f2fs_down_write(&F2FS_I(new_inode)->i_sem);
1203 if (!new_dir_entry)
1204 file_lost_pino(new_inode);
1205 else
1206 /* adjust dir's i_pino to pass fsck check */
1207 f2fs_i_pino_write(new_inode, old_dir->i_ino);
1208 f2fs_up_write(&F2FS_I(new_inode)->i_sem);
1209
1210 inode_set_ctime_current(new_dir);
1211 if (new_nlink) {
1212 f2fs_down_write(&F2FS_I(new_dir)->i_sem);
1213 f2fs_i_links_write(new_dir, new_nlink > 0);
1214 f2fs_up_write(&F2FS_I(new_dir)->i_sem);
1215 }
1216 f2fs_mark_inode_dirty_sync(new_dir, false);
1217
1218 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1219 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1220 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1221 }
1222
1223 f2fs_unlock_op(sbi);
1224
1225 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1226 f2fs_sync_fs(sbi->sb, 1);
1227
1228 f2fs_update_time(sbi, REQ_TIME);
1229 return 0;
1230out_new_dir:
1231 if (new_dir_entry) {
1232 f2fs_put_page(new_dir_page, 0);
1233 }
1234out_old_dir:
1235 if (old_dir_entry) {
1236 f2fs_put_page(old_dir_page, 0);
1237 }
1238out_new:
1239 f2fs_put_page(new_page, 0);
1240out_old:
1241 f2fs_put_page(old_page, 0);
1242out:
1243 return err;
1244}
1245
1246static int f2fs_rename2(struct mnt_idmap *idmap,
1247 struct inode *old_dir, struct dentry *old_dentry,
1248 struct inode *new_dir, struct dentry *new_dentry,
1249 unsigned int flags)
1250{
1251 int err;
1252
1253 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1254 return -EINVAL;
1255
1256 trace_f2fs_rename_start(old_dir, old_dentry, new_dir, new_dentry,
1257 flags);
1258
1259 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1260 flags);
1261 if (err)
1262 return err;
1263
1264 if (flags & RENAME_EXCHANGE)
1265 err = f2fs_cross_rename(old_dir, old_dentry,
1266 new_dir, new_dentry);
1267 else
1268 /*
1269 * VFS has already handled the new dentry existence case,
1270 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1271 */
1272 err = f2fs_rename(idmap, old_dir, old_dentry,
1273 new_dir, new_dentry, flags);
1274
1275 trace_f2fs_rename_end(old_dentry, new_dentry, flags, err);
1276 return err;
1277}
1278
1279static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1280 struct inode *inode,
1281 struct delayed_call *done)
1282{
1283 struct page *page;
1284 const char *target;
1285
1286 if (!dentry)
1287 return ERR_PTR(-ECHILD);
1288
1289 page = read_mapping_page(inode->i_mapping, 0, NULL);
1290 if (IS_ERR(page))
1291 return ERR_CAST(page);
1292
1293 target = fscrypt_get_symlink(inode, page_address(page),
1294 inode->i_sb->s_blocksize, done);
1295 put_page(page);
1296 return target;
1297}
1298
1299static int f2fs_encrypted_symlink_getattr(struct mnt_idmap *idmap,
1300 const struct path *path,
1301 struct kstat *stat, u32 request_mask,
1302 unsigned int query_flags)
1303{
1304 f2fs_getattr(idmap, path, stat, request_mask, query_flags);
1305
1306 return fscrypt_symlink_getattr(path, stat);
1307}
1308
1309const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1310 .get_link = f2fs_encrypted_get_link,
1311 .getattr = f2fs_encrypted_symlink_getattr,
1312 .setattr = f2fs_setattr,
1313 .listxattr = f2fs_listxattr,
1314};
1315
1316const struct inode_operations f2fs_dir_inode_operations = {
1317 .create = f2fs_create,
1318 .lookup = f2fs_lookup,
1319 .link = f2fs_link,
1320 .unlink = f2fs_unlink,
1321 .symlink = f2fs_symlink,
1322 .mkdir = f2fs_mkdir,
1323 .rmdir = f2fs_rmdir,
1324 .mknod = f2fs_mknod,
1325 .rename = f2fs_rename2,
1326 .tmpfile = f2fs_tmpfile,
1327 .getattr = f2fs_getattr,
1328 .setattr = f2fs_setattr,
1329 .get_inode_acl = f2fs_get_acl,
1330 .set_acl = f2fs_set_acl,
1331 .listxattr = f2fs_listxattr,
1332 .fiemap = f2fs_fiemap,
1333 .fileattr_get = f2fs_fileattr_get,
1334 .fileattr_set = f2fs_fileattr_set,
1335};
1336
1337const struct inode_operations f2fs_symlink_inode_operations = {
1338 .get_link = f2fs_get_link,
1339 .getattr = f2fs_getattr,
1340 .setattr = f2fs_setattr,
1341 .listxattr = f2fs_listxattr,
1342};
1343
1344const struct inode_operations f2fs_special_inode_operations = {
1345 .getattr = f2fs_getattr,
1346 .setattr = f2fs_setattr,
1347 .get_inode_acl = f2fs_get_acl,
1348 .set_acl = f2fs_set_acl,
1349 .listxattr = f2fs_listxattr,
1350};