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netfilter: layer7 fix wrong fuzzy match change
[people/arne_f/kernel.git] / fs / f2fs / namei.c
1 /*
2 * fs/f2fs/namei.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11 #include <linux/fs.h>
12 #include <linux/f2fs_fs.h>
13 #include <linux/pagemap.h>
14 #include <linux/sched.h>
15 #include <linux/ctype.h>
16 #include <linux/dcache.h>
17 #include <linux/namei.h>
18 #include <linux/quotaops.h>
19
20 #include "f2fs.h"
21 #include "node.h"
22 #include "xattr.h"
23 #include "acl.h"
24 #include <trace/events/f2fs.h>
25
26 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
27 {
28 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
29 nid_t ino;
30 struct inode *inode;
31 bool nid_free = false;
32 int err;
33
34 inode = new_inode(dir->i_sb);
35 if (!inode)
36 return ERR_PTR(-ENOMEM);
37
38 f2fs_lock_op(sbi);
39 if (!alloc_nid(sbi, &ino)) {
40 f2fs_unlock_op(sbi);
41 err = -ENOSPC;
42 goto fail;
43 }
44 f2fs_unlock_op(sbi);
45
46 nid_free = true;
47
48 inode_init_owner(inode, dir, mode);
49
50 inode->i_ino = ino;
51 inode->i_blocks = 0;
52 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
53 inode->i_generation = sbi->s_next_generation++;
54
55 err = insert_inode_locked(inode);
56 if (err) {
57 err = -EINVAL;
58 goto fail;
59 }
60
61 if (f2fs_sb_has_project_quota(sbi->sb) &&
62 (F2FS_I(dir)->i_flags & FS_PROJINHERIT_FL))
63 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
64 else
65 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
66 F2FS_DEF_PROJID);
67
68 err = dquot_initialize(inode);
69 if (err)
70 goto fail_drop;
71
72 err = dquot_alloc_inode(inode);
73 if (err)
74 goto fail_drop;
75
76 /* If the directory encrypted, then we should encrypt the inode. */
77 if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
78 f2fs_set_encrypted_inode(inode);
79
80 set_inode_flag(inode, FI_NEW_INODE);
81
82 if (f2fs_sb_has_extra_attr(sbi->sb)) {
83 set_inode_flag(inode, FI_EXTRA_ATTR);
84 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
85 }
86
87 if (test_opt(sbi, INLINE_XATTR))
88 set_inode_flag(inode, FI_INLINE_XATTR);
89 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
90 set_inode_flag(inode, FI_INLINE_DATA);
91 if (f2fs_may_inline_dentry(inode))
92 set_inode_flag(inode, FI_INLINE_DENTRY);
93
94 f2fs_init_extent_tree(inode, NULL);
95
96 stat_inc_inline_xattr(inode);
97 stat_inc_inline_inode(inode);
98 stat_inc_inline_dir(inode);
99
100 F2FS_I(inode)->i_flags =
101 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
102
103 if (S_ISDIR(inode->i_mode))
104 F2FS_I(inode)->i_flags |= FS_INDEX_FL;
105
106 if (F2FS_I(inode)->i_flags & FS_PROJINHERIT_FL)
107 set_inode_flag(inode, FI_PROJ_INHERIT);
108
109 trace_f2fs_new_inode(inode, 0);
110 return inode;
111
112 fail:
113 trace_f2fs_new_inode(inode, err);
114 make_bad_inode(inode);
115 if (nid_free)
116 set_inode_flag(inode, FI_FREE_NID);
117 iput(inode);
118 return ERR_PTR(err);
119 fail_drop:
120 trace_f2fs_new_inode(inode, err);
121 dquot_drop(inode);
122 inode->i_flags |= S_NOQUOTA;
123 if (nid_free)
124 set_inode_flag(inode, FI_FREE_NID);
125 clear_nlink(inode);
126 unlock_new_inode(inode);
127 iput(inode);
128 return ERR_PTR(err);
129 }
130
131 static int is_multimedia_file(const unsigned char *s, const char *sub)
132 {
133 size_t slen = strlen(s);
134 size_t sublen = strlen(sub);
135 int i;
136
137 /*
138 * filename format of multimedia file should be defined as:
139 * "filename + '.' + extension + (optional: '.' + temp extension)".
140 */
141 if (slen < sublen + 2)
142 return 0;
143
144 for (i = 1; i < slen - sublen; i++) {
145 if (s[i] != '.')
146 continue;
147 if (!strncasecmp(s + i + 1, sub, sublen))
148 return 1;
149 }
150
151 return 0;
152 }
153
154 /*
155 * Set multimedia files as cold files for hot/cold data separation
156 */
157 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
158 const unsigned char *name)
159 {
160 int i;
161 __u8 (*extlist)[8] = sbi->raw_super->extension_list;
162
163 int count = le32_to_cpu(sbi->raw_super->extension_count);
164 for (i = 0; i < count; i++) {
165 if (is_multimedia_file(name, extlist[i])) {
166 file_set_cold(inode);
167 break;
168 }
169 }
170 }
171
172 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
173 bool excl)
174 {
175 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
176 struct inode *inode;
177 nid_t ino = 0;
178 int err;
179
180 err = dquot_initialize(dir);
181 if (err)
182 return err;
183
184 inode = f2fs_new_inode(dir, mode);
185 if (IS_ERR(inode))
186 return PTR_ERR(inode);
187
188 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
189 set_cold_files(sbi, inode, dentry->d_name.name);
190
191 inode->i_op = &f2fs_file_inode_operations;
192 inode->i_fop = &f2fs_file_operations;
193 inode->i_mapping->a_ops = &f2fs_dblock_aops;
194 ino = inode->i_ino;
195
196 f2fs_lock_op(sbi);
197 err = f2fs_add_link(dentry, inode);
198 if (err)
199 goto out;
200 f2fs_unlock_op(sbi);
201
202 alloc_nid_done(sbi, ino);
203
204 d_instantiate(dentry, inode);
205 unlock_new_inode(inode);
206
207 if (IS_DIRSYNC(dir))
208 f2fs_sync_fs(sbi->sb, 1);
209
210 f2fs_balance_fs(sbi, true);
211 return 0;
212 out:
213 handle_failed_inode(inode);
214 return err;
215 }
216
217 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
218 struct dentry *dentry)
219 {
220 struct inode *inode = d_inode(old_dentry);
221 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
222 int err;
223
224 if (f2fs_encrypted_inode(dir) &&
225 !fscrypt_has_permitted_context(dir, inode))
226 return -EPERM;
227
228 if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
229 (!projid_eq(F2FS_I(dir)->i_projid,
230 F2FS_I(old_dentry->d_inode)->i_projid)))
231 return -EXDEV;
232
233 err = dquot_initialize(dir);
234 if (err)
235 return err;
236
237 f2fs_balance_fs(sbi, true);
238
239 inode->i_ctime = current_time(inode);
240 ihold(inode);
241
242 set_inode_flag(inode, FI_INC_LINK);
243 f2fs_lock_op(sbi);
244 err = f2fs_add_link(dentry, inode);
245 if (err)
246 goto out;
247 f2fs_unlock_op(sbi);
248
249 d_instantiate(dentry, inode);
250
251 if (IS_DIRSYNC(dir))
252 f2fs_sync_fs(sbi->sb, 1);
253 return 0;
254 out:
255 clear_inode_flag(inode, FI_INC_LINK);
256 iput(inode);
257 f2fs_unlock_op(sbi);
258 return err;
259 }
260
261 struct dentry *f2fs_get_parent(struct dentry *child)
262 {
263 struct qstr dotdot = QSTR_INIT("..", 2);
264 struct page *page;
265 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
266 if (!ino) {
267 if (IS_ERR(page))
268 return ERR_CAST(page);
269 return ERR_PTR(-ENOENT);
270 }
271 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
272 }
273
274 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
275 {
276 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
277 struct qstr dot = QSTR_INIT(".", 1);
278 struct qstr dotdot = QSTR_INIT("..", 2);
279 struct f2fs_dir_entry *de;
280 struct page *page;
281 int err = 0;
282
283 if (f2fs_readonly(sbi->sb)) {
284 f2fs_msg(sbi->sb, KERN_INFO,
285 "skip recovering inline_dots inode (ino:%lu, pino:%u) "
286 "in readonly mountpoint", dir->i_ino, pino);
287 return 0;
288 }
289
290 err = dquot_initialize(dir);
291 if (err)
292 return err;
293
294 f2fs_balance_fs(sbi, true);
295
296 f2fs_lock_op(sbi);
297
298 de = f2fs_find_entry(dir, &dot, &page);
299 if (de) {
300 f2fs_dentry_kunmap(dir, page);
301 f2fs_put_page(page, 0);
302 } else if (IS_ERR(page)) {
303 err = PTR_ERR(page);
304 goto out;
305 } else {
306 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
307 if (err)
308 goto out;
309 }
310
311 de = f2fs_find_entry(dir, &dotdot, &page);
312 if (de) {
313 f2fs_dentry_kunmap(dir, page);
314 f2fs_put_page(page, 0);
315 } else if (IS_ERR(page)) {
316 err = PTR_ERR(page);
317 } else {
318 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
319 }
320 out:
321 if (!err)
322 clear_inode_flag(dir, FI_INLINE_DOTS);
323
324 f2fs_unlock_op(sbi);
325 return err;
326 }
327
328 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
329 unsigned int flags)
330 {
331 struct inode *inode = NULL;
332 struct f2fs_dir_entry *de;
333 struct page *page;
334 nid_t ino;
335 int err = 0;
336 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
337
338 if (f2fs_encrypted_inode(dir)) {
339 int res = fscrypt_get_encryption_info(dir);
340
341 /*
342 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
343 * created while the directory was encrypted and we
344 * don't have access to the key.
345 */
346 if (fscrypt_has_encryption_key(dir))
347 fscrypt_set_encrypted_dentry(dentry);
348 fscrypt_set_d_op(dentry);
349 if (res && res != -ENOKEY)
350 return ERR_PTR(res);
351 }
352
353 if (dentry->d_name.len > F2FS_NAME_LEN)
354 return ERR_PTR(-ENAMETOOLONG);
355
356 de = f2fs_find_entry(dir, &dentry->d_name, &page);
357 if (!de) {
358 if (IS_ERR(page))
359 return (struct dentry *)page;
360 return d_splice_alias(inode, dentry);
361 }
362
363 ino = le32_to_cpu(de->ino);
364 f2fs_dentry_kunmap(dir, page);
365 f2fs_put_page(page, 0);
366
367 inode = f2fs_iget(dir->i_sb, ino);
368 if (IS_ERR(inode))
369 return ERR_CAST(inode);
370
371 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
372 err = __recover_dot_dentries(dir, root_ino);
373 if (err)
374 goto err_out;
375 }
376
377 if (f2fs_has_inline_dots(inode)) {
378 err = __recover_dot_dentries(inode, dir->i_ino);
379 if (err)
380 goto err_out;
381 }
382 if (f2fs_encrypted_inode(dir) &&
383 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
384 !fscrypt_has_permitted_context(dir, inode)) {
385 f2fs_msg(inode->i_sb, KERN_WARNING,
386 "Inconsistent encryption contexts: %lu/%lu",
387 dir->i_ino, inode->i_ino);
388 err = -EPERM;
389 goto err_out;
390 }
391 return d_splice_alias(inode, dentry);
392
393 err_out:
394 iput(inode);
395 return ERR_PTR(err);
396 }
397
398 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
399 {
400 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
401 struct inode *inode = d_inode(dentry);
402 struct f2fs_dir_entry *de;
403 struct page *page;
404 int err = -ENOENT;
405
406 trace_f2fs_unlink_enter(dir, dentry);
407
408 err = dquot_initialize(dir);
409 if (err)
410 return err;
411
412 de = f2fs_find_entry(dir, &dentry->d_name, &page);
413 if (!de) {
414 if (IS_ERR(page))
415 err = PTR_ERR(page);
416 goto fail;
417 }
418
419 f2fs_balance_fs(sbi, true);
420
421 f2fs_lock_op(sbi);
422 err = acquire_orphan_inode(sbi);
423 if (err) {
424 f2fs_unlock_op(sbi);
425 f2fs_dentry_kunmap(dir, page);
426 f2fs_put_page(page, 0);
427 goto fail;
428 }
429 f2fs_delete_entry(de, page, dir, inode);
430 f2fs_unlock_op(sbi);
431
432 if (IS_DIRSYNC(dir))
433 f2fs_sync_fs(sbi->sb, 1);
434 fail:
435 trace_f2fs_unlink_exit(inode, err);
436 return err;
437 }
438
439 static const char *f2fs_get_link(struct dentry *dentry,
440 struct inode *inode,
441 struct delayed_call *done)
442 {
443 const char *link = page_get_link(dentry, inode, done);
444 if (!IS_ERR(link) && !*link) {
445 /* this is broken symlink case */
446 do_delayed_call(done);
447 clear_delayed_call(done);
448 link = ERR_PTR(-ENOENT);
449 }
450 return link;
451 }
452
453 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
454 const char *symname)
455 {
456 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
457 struct inode *inode;
458 size_t len = strlen(symname);
459 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
460 struct fscrypt_symlink_data *sd = NULL;
461 int err;
462
463 if (f2fs_encrypted_inode(dir)) {
464 err = fscrypt_get_encryption_info(dir);
465 if (err)
466 return err;
467
468 if (!fscrypt_has_encryption_key(dir))
469 return -ENOKEY;
470
471 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
472 sizeof(struct fscrypt_symlink_data));
473 }
474
475 if (disk_link.len > dir->i_sb->s_blocksize)
476 return -ENAMETOOLONG;
477
478 err = dquot_initialize(dir);
479 if (err)
480 return err;
481
482 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
483 if (IS_ERR(inode))
484 return PTR_ERR(inode);
485
486 if (f2fs_encrypted_inode(inode))
487 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
488 else
489 inode->i_op = &f2fs_symlink_inode_operations;
490 inode_nohighmem(inode);
491 inode->i_mapping->a_ops = &f2fs_dblock_aops;
492
493 f2fs_lock_op(sbi);
494 err = f2fs_add_link(dentry, inode);
495 if (err)
496 goto out;
497 f2fs_unlock_op(sbi);
498 alloc_nid_done(sbi, inode->i_ino);
499
500 if (f2fs_encrypted_inode(inode)) {
501 struct qstr istr = QSTR_INIT(symname, len);
502 struct fscrypt_str ostr;
503
504 sd = kzalloc(disk_link.len, GFP_NOFS);
505 if (!sd) {
506 err = -ENOMEM;
507 goto err_out;
508 }
509
510 err = fscrypt_get_encryption_info(inode);
511 if (err)
512 goto err_out;
513
514 if (!fscrypt_has_encryption_key(inode)) {
515 err = -ENOKEY;
516 goto err_out;
517 }
518
519 ostr.name = sd->encrypted_path;
520 ostr.len = disk_link.len;
521 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
522 if (err)
523 goto err_out;
524
525 sd->len = cpu_to_le16(ostr.len);
526 disk_link.name = (char *)sd;
527 }
528
529 err = page_symlink(inode, disk_link.name, disk_link.len);
530
531 err_out:
532 d_instantiate(dentry, inode);
533 unlock_new_inode(inode);
534
535 /*
536 * Let's flush symlink data in order to avoid broken symlink as much as
537 * possible. Nevertheless, fsyncing is the best way, but there is no
538 * way to get a file descriptor in order to flush that.
539 *
540 * Note that, it needs to do dir->fsync to make this recoverable.
541 * If the symlink path is stored into inline_data, there is no
542 * performance regression.
543 */
544 if (!err) {
545 filemap_write_and_wait_range(inode->i_mapping, 0,
546 disk_link.len - 1);
547
548 if (IS_DIRSYNC(dir))
549 f2fs_sync_fs(sbi->sb, 1);
550 } else {
551 f2fs_unlink(dir, dentry);
552 }
553
554 kfree(sd);
555
556 f2fs_balance_fs(sbi, true);
557 return err;
558 out:
559 handle_failed_inode(inode);
560 return err;
561 }
562
563 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
564 {
565 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
566 struct inode *inode;
567 int err;
568
569 err = dquot_initialize(dir);
570 if (err)
571 return err;
572
573 inode = f2fs_new_inode(dir, S_IFDIR | mode);
574 if (IS_ERR(inode))
575 return PTR_ERR(inode);
576
577 inode->i_op = &f2fs_dir_inode_operations;
578 inode->i_fop = &f2fs_dir_operations;
579 inode->i_mapping->a_ops = &f2fs_dblock_aops;
580 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
581
582 set_inode_flag(inode, FI_INC_LINK);
583 f2fs_lock_op(sbi);
584 err = f2fs_add_link(dentry, inode);
585 if (err)
586 goto out_fail;
587 f2fs_unlock_op(sbi);
588
589 alloc_nid_done(sbi, inode->i_ino);
590
591 d_instantiate(dentry, inode);
592 unlock_new_inode(inode);
593
594 if (IS_DIRSYNC(dir))
595 f2fs_sync_fs(sbi->sb, 1);
596
597 f2fs_balance_fs(sbi, true);
598 return 0;
599
600 out_fail:
601 clear_inode_flag(inode, FI_INC_LINK);
602 handle_failed_inode(inode);
603 return err;
604 }
605
606 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
607 {
608 struct inode *inode = d_inode(dentry);
609 if (f2fs_empty_dir(inode))
610 return f2fs_unlink(dir, dentry);
611 return -ENOTEMPTY;
612 }
613
614 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
615 umode_t mode, dev_t rdev)
616 {
617 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
618 struct inode *inode;
619 int err = 0;
620
621 err = dquot_initialize(dir);
622 if (err)
623 return err;
624
625 inode = f2fs_new_inode(dir, mode);
626 if (IS_ERR(inode))
627 return PTR_ERR(inode);
628
629 init_special_inode(inode, inode->i_mode, rdev);
630 inode->i_op = &f2fs_special_inode_operations;
631
632 f2fs_lock_op(sbi);
633 err = f2fs_add_link(dentry, inode);
634 if (err)
635 goto out;
636 f2fs_unlock_op(sbi);
637
638 alloc_nid_done(sbi, inode->i_ino);
639
640 d_instantiate(dentry, inode);
641 unlock_new_inode(inode);
642
643 if (IS_DIRSYNC(dir))
644 f2fs_sync_fs(sbi->sb, 1);
645
646 f2fs_balance_fs(sbi, true);
647 return 0;
648 out:
649 handle_failed_inode(inode);
650 return err;
651 }
652
653 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
654 umode_t mode, struct inode **whiteout)
655 {
656 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
657 struct inode *inode;
658 int err;
659
660 err = dquot_initialize(dir);
661 if (err)
662 return err;
663
664 inode = f2fs_new_inode(dir, mode);
665 if (IS_ERR(inode))
666 return PTR_ERR(inode);
667
668 if (whiteout) {
669 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
670 inode->i_op = &f2fs_special_inode_operations;
671 } else {
672 inode->i_op = &f2fs_file_inode_operations;
673 inode->i_fop = &f2fs_file_operations;
674 inode->i_mapping->a_ops = &f2fs_dblock_aops;
675 }
676
677 f2fs_lock_op(sbi);
678 err = acquire_orphan_inode(sbi);
679 if (err)
680 goto out;
681
682 err = f2fs_do_tmpfile(inode, dir);
683 if (err)
684 goto release_out;
685
686 /*
687 * add this non-linked tmpfile to orphan list, in this way we could
688 * remove all unused data of tmpfile after abnormal power-off.
689 */
690 add_orphan_inode(inode);
691 alloc_nid_done(sbi, inode->i_ino);
692
693 if (whiteout) {
694 f2fs_i_links_write(inode, false);
695 *whiteout = inode;
696 } else {
697 d_tmpfile(dentry, inode);
698 }
699 /* link_count was changed by d_tmpfile as well. */
700 f2fs_unlock_op(sbi);
701 unlock_new_inode(inode);
702
703 f2fs_balance_fs(sbi, true);
704 return 0;
705
706 release_out:
707 release_orphan_inode(sbi);
708 out:
709 handle_failed_inode(inode);
710 return err;
711 }
712
713 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
714 {
715 if (f2fs_encrypted_inode(dir)) {
716 int err = fscrypt_get_encryption_info(dir);
717 if (err)
718 return err;
719 }
720
721 return __f2fs_tmpfile(dir, dentry, mode, NULL);
722 }
723
724 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
725 {
726 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
727 }
728
729 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
730 struct inode *new_dir, struct dentry *new_dentry,
731 unsigned int flags)
732 {
733 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
734 struct inode *old_inode = d_inode(old_dentry);
735 struct inode *new_inode = d_inode(new_dentry);
736 struct inode *whiteout = NULL;
737 struct page *old_dir_page;
738 struct page *old_page, *new_page = NULL;
739 struct f2fs_dir_entry *old_dir_entry = NULL;
740 struct f2fs_dir_entry *old_entry;
741 struct f2fs_dir_entry *new_entry;
742 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
743 int err = -ENOENT;
744
745 if ((f2fs_encrypted_inode(old_dir) &&
746 !fscrypt_has_encryption_key(old_dir)) ||
747 (f2fs_encrypted_inode(new_dir) &&
748 !fscrypt_has_encryption_key(new_dir)))
749 return -ENOKEY;
750
751 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
752 !fscrypt_has_permitted_context(new_dir, old_inode)) {
753 err = -EPERM;
754 goto out;
755 }
756
757 if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
758 (!projid_eq(F2FS_I(new_dir)->i_projid,
759 F2FS_I(old_dentry->d_inode)->i_projid)))
760 return -EXDEV;
761
762 err = dquot_initialize(old_dir);
763 if (err)
764 goto out;
765
766 err = dquot_initialize(new_dir);
767 if (err)
768 goto out;
769
770 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
771 if (!old_entry) {
772 if (IS_ERR(old_page))
773 err = PTR_ERR(old_page);
774 goto out;
775 }
776
777 if (S_ISDIR(old_inode->i_mode)) {
778 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
779 if (!old_dir_entry) {
780 if (IS_ERR(old_dir_page))
781 err = PTR_ERR(old_dir_page);
782 goto out_old;
783 }
784 }
785
786 if (flags & RENAME_WHITEOUT) {
787 err = f2fs_create_whiteout(old_dir, &whiteout);
788 if (err)
789 goto out_dir;
790 }
791
792 if (new_inode) {
793
794 err = -ENOTEMPTY;
795 if (old_dir_entry && !f2fs_empty_dir(new_inode))
796 goto out_whiteout;
797
798 err = -ENOENT;
799 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
800 &new_page);
801 if (!new_entry) {
802 if (IS_ERR(new_page))
803 err = PTR_ERR(new_page);
804 goto out_whiteout;
805 }
806
807 f2fs_balance_fs(sbi, true);
808
809 f2fs_lock_op(sbi);
810
811 err = acquire_orphan_inode(sbi);
812 if (err)
813 goto put_out_dir;
814
815 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
816
817 new_inode->i_ctime = current_time(new_inode);
818 down_write(&F2FS_I(new_inode)->i_sem);
819 if (old_dir_entry)
820 f2fs_i_links_write(new_inode, false);
821 f2fs_i_links_write(new_inode, false);
822 up_write(&F2FS_I(new_inode)->i_sem);
823
824 if (!new_inode->i_nlink)
825 add_orphan_inode(new_inode);
826 else
827 release_orphan_inode(sbi);
828 } else {
829 f2fs_balance_fs(sbi, true);
830
831 f2fs_lock_op(sbi);
832
833 err = f2fs_add_link(new_dentry, old_inode);
834 if (err) {
835 f2fs_unlock_op(sbi);
836 goto out_whiteout;
837 }
838
839 if (old_dir_entry)
840 f2fs_i_links_write(new_dir, true);
841
842 /*
843 * old entry and new entry can locate in the same inline
844 * dentry in inode, when attaching new entry in inline dentry,
845 * it could force inline dentry conversion, after that,
846 * old_entry and old_page will point to wrong address, in
847 * order to avoid this, let's do the check and update here.
848 */
849 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
850 f2fs_put_page(old_page, 0);
851 old_page = NULL;
852
853 old_entry = f2fs_find_entry(old_dir,
854 &old_dentry->d_name, &old_page);
855 if (!old_entry) {
856 err = -ENOENT;
857 if (IS_ERR(old_page))
858 err = PTR_ERR(old_page);
859 f2fs_unlock_op(sbi);
860 goto out_whiteout;
861 }
862 }
863 }
864
865 down_write(&F2FS_I(old_inode)->i_sem);
866 if (!old_dir_entry || whiteout)
867 file_lost_pino(old_inode);
868 else
869 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
870 up_write(&F2FS_I(old_inode)->i_sem);
871
872 old_inode->i_ctime = current_time(old_inode);
873 f2fs_mark_inode_dirty_sync(old_inode, false);
874
875 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
876
877 if (whiteout) {
878 whiteout->i_state |= I_LINKABLE;
879 set_inode_flag(whiteout, FI_INC_LINK);
880 err = f2fs_add_link(old_dentry, whiteout);
881 if (err)
882 goto put_out_dir;
883 whiteout->i_state &= ~I_LINKABLE;
884 iput(whiteout);
885 }
886
887 if (old_dir_entry) {
888 if (old_dir != new_dir && !whiteout) {
889 f2fs_set_link(old_inode, old_dir_entry,
890 old_dir_page, new_dir);
891 } else {
892 f2fs_dentry_kunmap(old_inode, old_dir_page);
893 f2fs_put_page(old_dir_page, 0);
894 }
895 f2fs_i_links_write(old_dir, false);
896 }
897
898 f2fs_unlock_op(sbi);
899
900 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
901 f2fs_sync_fs(sbi->sb, 1);
902 return 0;
903
904 put_out_dir:
905 f2fs_unlock_op(sbi);
906 if (new_page) {
907 f2fs_dentry_kunmap(new_dir, new_page);
908 f2fs_put_page(new_page, 0);
909 }
910 out_whiteout:
911 if (whiteout)
912 iput(whiteout);
913 out_dir:
914 if (old_dir_entry) {
915 f2fs_dentry_kunmap(old_inode, old_dir_page);
916 f2fs_put_page(old_dir_page, 0);
917 }
918 out_old:
919 f2fs_dentry_kunmap(old_dir, old_page);
920 f2fs_put_page(old_page, 0);
921 out:
922 return err;
923 }
924
925 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
926 struct inode *new_dir, struct dentry *new_dentry)
927 {
928 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
929 struct inode *old_inode = d_inode(old_dentry);
930 struct inode *new_inode = d_inode(new_dentry);
931 struct page *old_dir_page, *new_dir_page;
932 struct page *old_page, *new_page;
933 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
934 struct f2fs_dir_entry *old_entry, *new_entry;
935 int old_nlink = 0, new_nlink = 0;
936 int err = -ENOENT;
937
938 if ((f2fs_encrypted_inode(old_dir) &&
939 !fscrypt_has_encryption_key(old_dir)) ||
940 (f2fs_encrypted_inode(new_dir) &&
941 !fscrypt_has_encryption_key(new_dir)))
942 return -ENOKEY;
943
944 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
945 (old_dir != new_dir) &&
946 (!fscrypt_has_permitted_context(new_dir, old_inode) ||
947 !fscrypt_has_permitted_context(old_dir, new_inode)))
948 return -EPERM;
949
950 if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
951 !projid_eq(F2FS_I(new_dir)->i_projid,
952 F2FS_I(old_dentry->d_inode)->i_projid)) ||
953 (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
954 !projid_eq(F2FS_I(old_dir)->i_projid,
955 F2FS_I(new_dentry->d_inode)->i_projid)))
956 return -EXDEV;
957
958 err = dquot_initialize(old_dir);
959 if (err)
960 goto out;
961
962 err = dquot_initialize(new_dir);
963 if (err)
964 goto out;
965
966 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
967 if (!old_entry) {
968 if (IS_ERR(old_page))
969 err = PTR_ERR(old_page);
970 goto out;
971 }
972
973 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
974 if (!new_entry) {
975 if (IS_ERR(new_page))
976 err = PTR_ERR(new_page);
977 goto out_old;
978 }
979
980 /* prepare for updating ".." directory entry info later */
981 if (old_dir != new_dir) {
982 if (S_ISDIR(old_inode->i_mode)) {
983 old_dir_entry = f2fs_parent_dir(old_inode,
984 &old_dir_page);
985 if (!old_dir_entry) {
986 if (IS_ERR(old_dir_page))
987 err = PTR_ERR(old_dir_page);
988 goto out_new;
989 }
990 }
991
992 if (S_ISDIR(new_inode->i_mode)) {
993 new_dir_entry = f2fs_parent_dir(new_inode,
994 &new_dir_page);
995 if (!new_dir_entry) {
996 if (IS_ERR(new_dir_page))
997 err = PTR_ERR(new_dir_page);
998 goto out_old_dir;
999 }
1000 }
1001 }
1002
1003 /*
1004 * If cross rename between file and directory those are not
1005 * in the same directory, we will inc nlink of file's parent
1006 * later, so we should check upper boundary of its nlink.
1007 */
1008 if ((!old_dir_entry || !new_dir_entry) &&
1009 old_dir_entry != new_dir_entry) {
1010 old_nlink = old_dir_entry ? -1 : 1;
1011 new_nlink = -old_nlink;
1012 err = -EMLINK;
1013 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1014 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1015 goto out_new_dir;
1016 }
1017
1018 f2fs_balance_fs(sbi, true);
1019
1020 f2fs_lock_op(sbi);
1021
1022 /* update ".." directory entry info of old dentry */
1023 if (old_dir_entry)
1024 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1025
1026 /* update ".." directory entry info of new dentry */
1027 if (new_dir_entry)
1028 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1029
1030 /* update directory entry info of old dir inode */
1031 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1032
1033 down_write(&F2FS_I(old_inode)->i_sem);
1034 file_lost_pino(old_inode);
1035 up_write(&F2FS_I(old_inode)->i_sem);
1036
1037 old_dir->i_ctime = current_time(old_dir);
1038 if (old_nlink) {
1039 down_write(&F2FS_I(old_dir)->i_sem);
1040 f2fs_i_links_write(old_dir, old_nlink > 0);
1041 up_write(&F2FS_I(old_dir)->i_sem);
1042 }
1043 f2fs_mark_inode_dirty_sync(old_dir, false);
1044
1045 /* update directory entry info of new dir inode */
1046 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1047
1048 down_write(&F2FS_I(new_inode)->i_sem);
1049 file_lost_pino(new_inode);
1050 up_write(&F2FS_I(new_inode)->i_sem);
1051
1052 new_dir->i_ctime = current_time(new_dir);
1053 if (new_nlink) {
1054 down_write(&F2FS_I(new_dir)->i_sem);
1055 f2fs_i_links_write(new_dir, new_nlink > 0);
1056 up_write(&F2FS_I(new_dir)->i_sem);
1057 }
1058 f2fs_mark_inode_dirty_sync(new_dir, false);
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 return 0;
1065 out_new_dir:
1066 if (new_dir_entry) {
1067 f2fs_dentry_kunmap(new_inode, new_dir_page);
1068 f2fs_put_page(new_dir_page, 0);
1069 }
1070 out_old_dir:
1071 if (old_dir_entry) {
1072 f2fs_dentry_kunmap(old_inode, old_dir_page);
1073 f2fs_put_page(old_dir_page, 0);
1074 }
1075 out_new:
1076 f2fs_dentry_kunmap(new_dir, new_page);
1077 f2fs_put_page(new_page, 0);
1078 out_old:
1079 f2fs_dentry_kunmap(old_dir, old_page);
1080 f2fs_put_page(old_page, 0);
1081 out:
1082 return err;
1083 }
1084
1085 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1086 struct inode *new_dir, struct dentry *new_dentry,
1087 unsigned int flags)
1088 {
1089 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1090 return -EINVAL;
1091
1092 if (flags & RENAME_EXCHANGE) {
1093 return f2fs_cross_rename(old_dir, old_dentry,
1094 new_dir, new_dentry);
1095 }
1096 /*
1097 * VFS has already handled the new dentry existence case,
1098 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1099 */
1100 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1101 }
1102
1103 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1104 struct inode *inode,
1105 struct delayed_call *done)
1106 {
1107 struct page *cpage = NULL;
1108 char *caddr, *paddr = NULL;
1109 struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1110 struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1111 struct fscrypt_symlink_data *sd;
1112 u32 max_size = inode->i_sb->s_blocksize;
1113 int res;
1114
1115 if (!dentry)
1116 return ERR_PTR(-ECHILD);
1117
1118 res = fscrypt_get_encryption_info(inode);
1119 if (res)
1120 return ERR_PTR(res);
1121
1122 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1123 if (IS_ERR(cpage))
1124 return ERR_CAST(cpage);
1125 caddr = page_address(cpage);
1126
1127 /* Symlink is encrypted */
1128 sd = (struct fscrypt_symlink_data *)caddr;
1129 cstr.name = sd->encrypted_path;
1130 cstr.len = le16_to_cpu(sd->len);
1131
1132 /* this is broken symlink case */
1133 if (unlikely(cstr.len == 0)) {
1134 res = -ENOENT;
1135 goto errout;
1136 }
1137
1138 if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1139 /* Symlink data on the disk is corrupted */
1140 res = -EIO;
1141 goto errout;
1142 }
1143 res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1144 if (res)
1145 goto errout;
1146
1147 res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1148 if (res)
1149 goto errout;
1150
1151 /* this is broken symlink case */
1152 if (unlikely(pstr.name[0] == 0)) {
1153 res = -ENOENT;
1154 goto errout;
1155 }
1156
1157 paddr = pstr.name;
1158
1159 /* Null-terminate the name */
1160 paddr[pstr.len] = '\0';
1161
1162 put_page(cpage);
1163 set_delayed_call(done, kfree_link, paddr);
1164 return paddr;
1165 errout:
1166 fscrypt_fname_free_buffer(&pstr);
1167 put_page(cpage);
1168 return ERR_PTR(res);
1169 }
1170
1171 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1172 .get_link = f2fs_encrypted_get_link,
1173 .getattr = f2fs_getattr,
1174 .setattr = f2fs_setattr,
1175 #ifdef CONFIG_F2FS_FS_XATTR
1176 .listxattr = f2fs_listxattr,
1177 #endif
1178 };
1179
1180 const struct inode_operations f2fs_dir_inode_operations = {
1181 .create = f2fs_create,
1182 .lookup = f2fs_lookup,
1183 .link = f2fs_link,
1184 .unlink = f2fs_unlink,
1185 .symlink = f2fs_symlink,
1186 .mkdir = f2fs_mkdir,
1187 .rmdir = f2fs_rmdir,
1188 .mknod = f2fs_mknod,
1189 .rename = f2fs_rename2,
1190 .tmpfile = f2fs_tmpfile,
1191 .getattr = f2fs_getattr,
1192 .setattr = f2fs_setattr,
1193 .get_acl = f2fs_get_acl,
1194 .set_acl = f2fs_set_acl,
1195 #ifdef CONFIG_F2FS_FS_XATTR
1196 .listxattr = f2fs_listxattr,
1197 #endif
1198 };
1199
1200 const struct inode_operations f2fs_symlink_inode_operations = {
1201 .get_link = f2fs_get_link,
1202 .getattr = f2fs_getattr,
1203 .setattr = f2fs_setattr,
1204 #ifdef CONFIG_F2FS_FS_XATTR
1205 .listxattr = f2fs_listxattr,
1206 #endif
1207 };
1208
1209 const struct inode_operations f2fs_special_inode_operations = {
1210 .getattr = f2fs_getattr,
1211 .setattr = f2fs_setattr,
1212 .get_acl = f2fs_get_acl,
1213 .set_acl = f2fs_set_acl,
1214 #ifdef CONFIG_F2FS_FS_XATTR
1215 .listxattr = f2fs_listxattr,
1216 #endif
1217 };
Arne's tree of linux kernel.