projects / GitHub / exynos8895 / android_kernel_samsung_universal8895.git / blob
? search:


cf8f4370d256f30c25902c02fb4f25cc0f27240e
[GitHub/exynos8895/android_kernel_samsung_universal8895.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 xattr_size = 0;
33 int err;
34
35 inode = new_inode(dir->i_sb);
36 if (!inode)
37 return ERR_PTR(-ENOMEM);
38
39 f2fs_lock_op(sbi);
40 if (!alloc_nid(sbi, &ino)) {
41 f2fs_unlock_op(sbi);
42 err = -ENOSPC;
43 goto fail;
44 }
45 f2fs_unlock_op(sbi);
46
47 nid_free = true;
48
49 inode_init_owner(inode, dir, mode);
50
51 inode->i_ino = ino;
52 inode->i_blocks = 0;
53 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
54 inode->i_generation = sbi->s_next_generation++;
55
56 err = insert_inode_locked(inode);
57 if (err) {
58 err = -EINVAL;
59 goto fail;
60 }
61
62 if (f2fs_sb_has_project_quota(sbi->sb) &&
63 (F2FS_I(dir)->i_flags & FS_PROJINHERIT_FL))
64 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
65 else
66 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
67 F2FS_DEF_PROJID);
68
69 err = dquot_initialize(inode);
70 if (err)
71 goto fail_drop;
72
73 err = dquot_alloc_inode(inode);
74 if (err)
75 goto fail_drop;
76
77 /* If the directory encrypted, then we should encrypt the inode. */
78 if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
79 f2fs_set_encrypted_inode(inode);
80
81 set_inode_flag(inode, FI_NEW_INODE);
82
83 if (f2fs_sb_has_extra_attr(sbi->sb)) {
84 set_inode_flag(inode, FI_EXTRA_ATTR);
85 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
86 }
87
88 if (test_opt(sbi, INLINE_XATTR))
89 set_inode_flag(inode, FI_INLINE_XATTR);
90
91 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
92 set_inode_flag(inode, FI_INLINE_DATA);
93 if (f2fs_may_inline_dentry(inode))
94 set_inode_flag(inode, FI_INLINE_DENTRY);
95
96 if (f2fs_sb_has_flexible_inline_xattr(sbi->sb)) {
97 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
98 if (f2fs_has_inline_xattr(inode))
99 xattr_size = sbi->inline_xattr_size;
100 /* Otherwise, will be 0 */
101 } else if (f2fs_has_inline_xattr(inode) ||
102 f2fs_has_inline_dentry(inode)) {
103 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
104 }
105 F2FS_I(inode)->i_inline_xattr_size = xattr_size;
106
107 f2fs_init_extent_tree(inode, NULL);
108
109 stat_inc_inline_xattr(inode);
110 stat_inc_inline_inode(inode);
111 stat_inc_inline_dir(inode);
112
113 F2FS_I(inode)->i_flags =
114 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
115
116 if (S_ISDIR(inode->i_mode))
117 F2FS_I(inode)->i_flags |= FS_INDEX_FL;
118
119 if (F2FS_I(inode)->i_flags & FS_PROJINHERIT_FL)
120 set_inode_flag(inode, FI_PROJ_INHERIT);
121
122 trace_f2fs_new_inode(inode, 0);
123 return inode;
124
125 fail:
126 trace_f2fs_new_inode(inode, err);
127 make_bad_inode(inode);
128 if (nid_free)
129 set_inode_flag(inode, FI_FREE_NID);
130 iput(inode);
131 return ERR_PTR(err);
132 fail_drop:
133 trace_f2fs_new_inode(inode, err);
134 dquot_drop(inode);
135 inode->i_flags |= S_NOQUOTA;
136 if (nid_free)
137 set_inode_flag(inode, FI_FREE_NID);
138 clear_nlink(inode);
139 unlock_new_inode(inode);
140 iput(inode);
141 return ERR_PTR(err);
142 }
143
144 static int is_multimedia_file(const unsigned char *s, const char *sub)
145 {
146 size_t slen = strlen(s);
147 size_t sublen = strlen(sub);
148 int i;
149
150 /*
151 * filename format of multimedia file should be defined as:
152 * "filename + '.' + extension + (optional: '.' + temp extension)".
153 */
154 if (slen < sublen + 2)
155 return 0;
156
157 for (i = 1; i < slen - sublen; i++) {
158 if (s[i] != '.')
159 continue;
160 if (!strncasecmp(s + i + 1, sub, sublen))
161 return 1;
162 }
163
164 return 0;
165 }
166
167 /*
168 * Set multimedia files as cold files for hot/cold data separation
169 */
170 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
171 const unsigned char *name)
172 {
173 int i;
174 __u8 (*extlist)[8] = sbi->raw_super->extension_list;
175
176 int count = le32_to_cpu(sbi->raw_super->extension_count);
177 for (i = 0; i < count; i++) {
178 if (is_multimedia_file(name, extlist[i])) {
179 file_set_cold(inode);
180 break;
181 }
182 }
183 }
184
185 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
186 bool excl)
187 {
188 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
189 struct inode *inode;
190 nid_t ino = 0;
191 int err;
192
193 if (unlikely(f2fs_cp_error(sbi)))
194 return -EIO;
195
196 err = dquot_initialize(dir);
197 if (err)
198 return err;
199
200 inode = f2fs_new_inode(dir, mode);
201 if (IS_ERR(inode))
202 return PTR_ERR(inode);
203
204 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
205 set_cold_files(sbi, inode, dentry->d_name.name);
206
207 inode->i_op = &f2fs_file_inode_operations;
208 inode->i_fop = &f2fs_file_operations;
209 inode->i_mapping->a_ops = &f2fs_dblock_aops;
210 ino = inode->i_ino;
211
212 f2fs_lock_op(sbi);
213 err = f2fs_add_link(dentry, inode);
214 if (err)
215 goto out;
216 f2fs_unlock_op(sbi);
217
218 alloc_nid_done(sbi, ino);
219
220 d_instantiate(dentry, inode);
221 unlock_new_inode(inode);
222
223 if (IS_DIRSYNC(dir))
224 f2fs_sync_fs(sbi->sb, 1);
225
226 f2fs_balance_fs(sbi, true);
227 return 0;
228 out:
229 handle_failed_inode(inode);
230 return err;
231 }
232
233 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
234 struct dentry *dentry)
235 {
236 struct inode *inode = d_inode(old_dentry);
237 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
238 int err;
239
240 if (unlikely(f2fs_cp_error(sbi)))
241 return -EIO;
242
243 if (f2fs_encrypted_inode(dir) &&
244 !fscrypt_has_permitted_context(dir, inode))
245 return -EPERM;
246
247 if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
248 (!projid_eq(F2FS_I(dir)->i_projid,
249 F2FS_I(old_dentry->d_inode)->i_projid)))
250 return -EXDEV;
251
252 err = dquot_initialize(dir);
253 if (err)
254 return err;
255
256 f2fs_balance_fs(sbi, true);
257
258 inode->i_ctime = current_time(inode);
259 ihold(inode);
260
261 set_inode_flag(inode, FI_INC_LINK);
262 f2fs_lock_op(sbi);
263 err = f2fs_add_link(dentry, inode);
264 if (err)
265 goto out;
266 f2fs_unlock_op(sbi);
267
268 d_instantiate(dentry, inode);
269
270 if (IS_DIRSYNC(dir))
271 f2fs_sync_fs(sbi->sb, 1);
272 return 0;
273 out:
274 clear_inode_flag(inode, FI_INC_LINK);
275 iput(inode);
276 f2fs_unlock_op(sbi);
277 return err;
278 }
279
280 struct dentry *f2fs_get_parent(struct dentry *child)
281 {
282 struct qstr dotdot = QSTR_INIT("..", 2);
283 struct page *page;
284 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
285 if (!ino) {
286 if (IS_ERR(page))
287 return ERR_CAST(page);
288 return ERR_PTR(-ENOENT);
289 }
290 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
291 }
292
293 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
294 {
295 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
296 struct qstr dot = QSTR_INIT(".", 1);
297 struct qstr dotdot = QSTR_INIT("..", 2);
298 struct f2fs_dir_entry *de;
299 struct page *page;
300 int err = 0;
301
302 if (f2fs_readonly(sbi->sb)) {
303 f2fs_msg(sbi->sb, KERN_INFO,
304 "skip recovering inline_dots inode (ino:%lu, pino:%u) "
305 "in readonly mountpoint", dir->i_ino, pino);
306 return 0;
307 }
308
309 err = dquot_initialize(dir);
310 if (err)
311 return err;
312
313 f2fs_balance_fs(sbi, true);
314
315 f2fs_lock_op(sbi);
316
317 de = f2fs_find_entry(dir, &dot, &page);
318 if (de) {
319 f2fs_dentry_kunmap(dir, page);
320 f2fs_put_page(page, 0);
321 } else if (IS_ERR(page)) {
322 err = PTR_ERR(page);
323 goto out;
324 } else {
325 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
326 if (err)
327 goto out;
328 }
329
330 de = f2fs_find_entry(dir, &dotdot, &page);
331 if (de) {
332 f2fs_dentry_kunmap(dir, page);
333 f2fs_put_page(page, 0);
334 } else if (IS_ERR(page)) {
335 err = PTR_ERR(page);
336 } else {
337 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
338 }
339 out:
340 if (!err)
341 clear_inode_flag(dir, FI_INLINE_DOTS);
342
343 f2fs_unlock_op(sbi);
344 return err;
345 }
346
347 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
348 unsigned int flags)
349 {
350 struct inode *inode = NULL;
351 struct f2fs_dir_entry *de;
352 struct page *page;
353 struct dentry *new;
354 nid_t ino = -1;
355 int err = 0;
356 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
357
358 trace_f2fs_lookup_start(dir, dentry, flags);
359
360 if (f2fs_encrypted_inode(dir)) {
361 err = fscrypt_get_encryption_info(dir);
362
363 /*
364 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
365 * created while the directory was encrypted and we
366 * don't have access to the key.
367 */
368 if (fscrypt_has_encryption_key(dir))
369 fscrypt_set_encrypted_dentry(dentry);
370 fscrypt_set_d_op(dentry);
371 if (err && err != -ENOKEY)
372 goto out;
373 }
374
375 if (dentry->d_name.len > F2FS_NAME_LEN) {
376 err = -ENAMETOOLONG;
377 goto out;
378 }
379
380 de = f2fs_find_entry(dir, &dentry->d_name, &page);
381 if (!de) {
382 if (IS_ERR(page)) {
383 err = PTR_ERR(page);
384 goto out;
385 }
386 goto out_splice;
387 }
388
389 ino = le32_to_cpu(de->ino);
390 f2fs_dentry_kunmap(dir, page);
391 f2fs_put_page(page, 0);
392
393 inode = f2fs_iget(dir->i_sb, ino);
394 if (IS_ERR(inode)) {
395 err = PTR_ERR(inode);
396 goto out;
397 }
398
399 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
400 err = __recover_dot_dentries(dir, root_ino);
401 if (err)
402 goto out_iput;
403 }
404
405 if (f2fs_has_inline_dots(inode)) {
406 err = __recover_dot_dentries(inode, dir->i_ino);
407 if (err)
408 goto out_iput;
409 }
410 if (f2fs_encrypted_inode(dir) &&
411 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
412 !fscrypt_has_permitted_context(dir, inode)) {
413 f2fs_msg(inode->i_sb, KERN_WARNING,
414 "Inconsistent encryption contexts: %lu/%lu",
415 dir->i_ino, inode->i_ino);
416 err = -EPERM;
417 goto out_iput;
418 }
419 out_splice:
420 new = d_splice_alias(inode, dentry);
421 if (IS_ERR(new))
422 err = PTR_ERR(new);
423 trace_f2fs_lookup_end(dir, dentry, ino, err);
424 return new;
425 out_iput:
426 iput(inode);
427 out:
428 trace_f2fs_lookup_end(dir, dentry, ino, err);
429 return ERR_PTR(err);
430 }
431
432 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
433 {
434 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
435 struct inode *inode = d_inode(dentry);
436 struct f2fs_dir_entry *de;
437 struct page *page;
438 int err = -ENOENT;
439
440 trace_f2fs_unlink_enter(dir, dentry);
441
442 if (unlikely(f2fs_cp_error(sbi)))
443 return -EIO;
444
445 err = dquot_initialize(dir);
446 if (err)
447 return err;
448 err = dquot_initialize(inode);
449 if (err)
450 return err;
451
452 de = f2fs_find_entry(dir, &dentry->d_name, &page);
453 if (!de) {
454 if (IS_ERR(page))
455 err = PTR_ERR(page);
456 goto fail;
457 }
458
459 f2fs_balance_fs(sbi, true);
460
461 f2fs_lock_op(sbi);
462 err = acquire_orphan_inode(sbi);
463 if (err) {
464 f2fs_unlock_op(sbi);
465 f2fs_dentry_kunmap(dir, page);
466 f2fs_put_page(page, 0);
467 goto fail;
468 }
469 f2fs_delete_entry(de, page, dir, inode);
470 f2fs_unlock_op(sbi);
471
472 if (IS_DIRSYNC(dir))
473 f2fs_sync_fs(sbi->sb, 1);
474 fail:
475 trace_f2fs_unlink_exit(inode, err);
476 return err;
477 }
478
479 static const char *f2fs_follow_link(struct dentry *dentry, void **cookie)
480 {
481 const char *link = page_follow_link_light(dentry, cookie);
482 if (!IS_ERR(link) && !*link) {
483 /* this is broken symlink case */
484 page_put_link(NULL, *cookie);
485 link = ERR_PTR(-ENOENT);
486 }
487 return link;
488 }
489
490 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
491 const char *symname)
492 {
493 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
494 struct inode *inode;
495 size_t len = strlen(symname);
496 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
497 struct fscrypt_symlink_data *sd = NULL;
498 int err;
499
500 if (unlikely(f2fs_cp_error(sbi)))
501 return -EIO;
502
503 if (f2fs_encrypted_inode(dir)) {
504 err = fscrypt_get_encryption_info(dir);
505 if (err)
506 return err;
507
508 if (!fscrypt_has_encryption_key(dir))
509 return -ENOKEY;
510
511 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
512 sizeof(struct fscrypt_symlink_data));
513 }
514
515 if (disk_link.len > dir->i_sb->s_blocksize)
516 return -ENAMETOOLONG;
517
518 err = dquot_initialize(dir);
519 if (err)
520 return err;
521
522 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
523 if (IS_ERR(inode))
524 return PTR_ERR(inode);
525
526 if (f2fs_encrypted_inode(inode))
527 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
528 else
529 inode->i_op = &f2fs_symlink_inode_operations;
530 inode_nohighmem(inode);
531 inode->i_mapping->a_ops = &f2fs_dblock_aops;
532
533 f2fs_lock_op(sbi);
534 err = f2fs_add_link(dentry, inode);
535 if (err)
536 goto out;
537 f2fs_unlock_op(sbi);
538 alloc_nid_done(sbi, inode->i_ino);
539
540 if (f2fs_encrypted_inode(inode)) {
541 struct qstr istr = QSTR_INIT(symname, len);
542 struct fscrypt_str ostr;
543
544 sd = kzalloc(disk_link.len, GFP_NOFS);
545 if (!sd) {
546 err = -ENOMEM;
547 goto err_out;
548 }
549
550 err = fscrypt_get_encryption_info(inode);
551 if (err)
552 goto err_out;
553
554 if (!fscrypt_has_encryption_key(inode)) {
555 err = -ENOKEY;
556 goto err_out;
557 }
558
559 ostr.name = sd->encrypted_path;
560 ostr.len = disk_link.len;
561 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
562 if (err)
563 goto err_out;
564
565 sd->len = cpu_to_le16(ostr.len);
566 disk_link.name = (char *)sd;
567 }
568
569 err = page_symlink(inode, disk_link.name, disk_link.len);
570
571 err_out:
572 d_instantiate(dentry, inode);
573 unlock_new_inode(inode);
574
575 /*
576 * Let's flush symlink data in order to avoid broken symlink as much as
577 * possible. Nevertheless, fsyncing is the best way, but there is no
578 * way to get a file descriptor in order to flush that.
579 *
580 * Note that, it needs to do dir->fsync to make this recoverable.
581 * If the symlink path is stored into inline_data, there is no
582 * performance regression.
583 */
584 if (!err) {
585 filemap_write_and_wait_range(inode->i_mapping, 0,
586 disk_link.len - 1);
587
588 if (IS_DIRSYNC(dir))
589 f2fs_sync_fs(sbi->sb, 1);
590 } else {
591 f2fs_unlink(dir, dentry);
592 }
593
594 kfree(sd);
595
596 f2fs_balance_fs(sbi, true);
597 return err;
598 out:
599 handle_failed_inode(inode);
600 return err;
601 }
602
603 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
604 {
605 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
606 struct inode *inode;
607 int err;
608
609 if (unlikely(f2fs_cp_error(sbi)))
610 return -EIO;
611
612 err = dquot_initialize(dir);
613 if (err)
614 return err;
615
616 inode = f2fs_new_inode(dir, S_IFDIR | mode);
617 if (IS_ERR(inode))
618 return PTR_ERR(inode);
619
620 inode->i_op = &f2fs_dir_inode_operations;
621 inode->i_fop = &f2fs_dir_operations;
622 inode->i_mapping->a_ops = &f2fs_dblock_aops;
623 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
624
625 set_inode_flag(inode, FI_INC_LINK);
626 f2fs_lock_op(sbi);
627 err = f2fs_add_link(dentry, inode);
628 if (err)
629 goto out_fail;
630 f2fs_unlock_op(sbi);
631
632 alloc_nid_done(sbi, inode->i_ino);
633
634 d_instantiate(dentry, inode);
635 unlock_new_inode(inode);
636
637 if (IS_DIRSYNC(dir))
638 f2fs_sync_fs(sbi->sb, 1);
639
640 f2fs_balance_fs(sbi, true);
641 return 0;
642
643 out_fail:
644 clear_inode_flag(inode, FI_INC_LINK);
645 handle_failed_inode(inode);
646 return err;
647 }
648
649 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
650 {
651 struct inode *inode = d_inode(dentry);
652 if (f2fs_empty_dir(inode))
653 return f2fs_unlink(dir, dentry);
654 return -ENOTEMPTY;
655 }
656
657 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
658 umode_t mode, dev_t rdev)
659 {
660 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
661 struct inode *inode;
662 int err = 0;
663
664 if (unlikely(f2fs_cp_error(sbi)))
665 return -EIO;
666
667 err = dquot_initialize(dir);
668 if (err)
669 return err;
670
671 inode = f2fs_new_inode(dir, mode);
672 if (IS_ERR(inode))
673 return PTR_ERR(inode);
674
675 init_special_inode(inode, inode->i_mode, rdev);
676 inode->i_op = &f2fs_special_inode_operations;
677
678 f2fs_lock_op(sbi);
679 err = f2fs_add_link(dentry, inode);
680 if (err)
681 goto out;
682 f2fs_unlock_op(sbi);
683
684 alloc_nid_done(sbi, inode->i_ino);
685
686 d_instantiate(dentry, inode);
687 unlock_new_inode(inode);
688
689 if (IS_DIRSYNC(dir))
690 f2fs_sync_fs(sbi->sb, 1);
691
692 f2fs_balance_fs(sbi, true);
693 return 0;
694 out:
695 handle_failed_inode(inode);
696 return err;
697 }
698
699 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
700 umode_t mode, struct inode **whiteout)
701 {
702 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
703 struct inode *inode;
704 int err;
705
706 err = dquot_initialize(dir);
707 if (err)
708 return err;
709
710 inode = f2fs_new_inode(dir, mode);
711 if (IS_ERR(inode))
712 return PTR_ERR(inode);
713
714 if (whiteout) {
715 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
716 inode->i_op = &f2fs_special_inode_operations;
717 } else {
718 inode->i_op = &f2fs_file_inode_operations;
719 inode->i_fop = &f2fs_file_operations;
720 inode->i_mapping->a_ops = &f2fs_dblock_aops;
721 }
722
723 f2fs_lock_op(sbi);
724 err = acquire_orphan_inode(sbi);
725 if (err)
726 goto out;
727
728 err = f2fs_do_tmpfile(inode, dir);
729 if (err)
730 goto release_out;
731
732 /*
733 * add this non-linked tmpfile to orphan list, in this way we could
734 * remove all unused data of tmpfile after abnormal power-off.
735 */
736 add_orphan_inode(inode);
737 alloc_nid_done(sbi, inode->i_ino);
738
739 if (whiteout) {
740 f2fs_i_links_write(inode, false);
741 *whiteout = inode;
742 } else {
743 d_tmpfile(dentry, inode);
744 }
745 /* link_count was changed by d_tmpfile as well. */
746 f2fs_unlock_op(sbi);
747 unlock_new_inode(inode);
748
749 f2fs_balance_fs(sbi, true);
750 return 0;
751
752 release_out:
753 release_orphan_inode(sbi);
754 out:
755 handle_failed_inode(inode);
756 return err;
757 }
758
759 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
760 {
761 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
762 return -EIO;
763
764 if (f2fs_encrypted_inode(dir)) {
765 int err = fscrypt_get_encryption_info(dir);
766 if (err)
767 return err;
768 }
769
770 return __f2fs_tmpfile(dir, dentry, mode, NULL);
771 }
772
773 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
774 {
775 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
776 return -EIO;
777
778 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
779 }
780
781 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
782 struct inode *new_dir, struct dentry *new_dentry,
783 unsigned int flags)
784 {
785 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
786 struct inode *old_inode = d_inode(old_dentry);
787 struct inode *new_inode = d_inode(new_dentry);
788 struct inode *whiteout = NULL;
789 struct page *old_dir_page;
790 struct page *old_page, *new_page = NULL;
791 struct f2fs_dir_entry *old_dir_entry = NULL;
792 struct f2fs_dir_entry *old_entry;
793 struct f2fs_dir_entry *new_entry;
794 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
795 int err = -ENOENT;
796
797 if (unlikely(f2fs_cp_error(sbi)))
798 return -EIO;
799
800 if ((f2fs_encrypted_inode(old_dir) &&
801 !fscrypt_has_encryption_key(old_dir)) ||
802 (f2fs_encrypted_inode(new_dir) &&
803 !fscrypt_has_encryption_key(new_dir)))
804 return -ENOKEY;
805
806 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
807 !fscrypt_has_permitted_context(new_dir, old_inode)) {
808 err = -EPERM;
809 goto out;
810 }
811
812 if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
813 (!projid_eq(F2FS_I(new_dir)->i_projid,
814 F2FS_I(old_dentry->d_inode)->i_projid)))
815 return -EXDEV;
816
817 err = dquot_initialize(old_dir);
818 if (err)
819 goto out;
820
821 err = dquot_initialize(new_dir);
822 if (err)
823 goto out;
824
825 if (new_inode) {
826 err = dquot_initialize(new_inode);
827 if (err)
828 goto out;
829 }
830
831 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
832 if (!old_entry) {
833 if (IS_ERR(old_page))
834 err = PTR_ERR(old_page);
835 goto out;
836 }
837
838 if (S_ISDIR(old_inode->i_mode)) {
839 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
840 if (!old_dir_entry) {
841 if (IS_ERR(old_dir_page))
842 err = PTR_ERR(old_dir_page);
843 goto out_old;
844 }
845 }
846
847 if (flags & RENAME_WHITEOUT) {
848 err = f2fs_create_whiteout(old_dir, &whiteout);
849 if (err)
850 goto out_dir;
851 }
852
853 if (new_inode) {
854
855 err = -ENOTEMPTY;
856 if (old_dir_entry && !f2fs_empty_dir(new_inode))
857 goto out_whiteout;
858
859 err = -ENOENT;
860 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
861 &new_page);
862 if (!new_entry) {
863 if (IS_ERR(new_page))
864 err = PTR_ERR(new_page);
865 goto out_whiteout;
866 }
867
868 f2fs_balance_fs(sbi, true);
869
870 f2fs_lock_op(sbi);
871
872 err = acquire_orphan_inode(sbi);
873 if (err)
874 goto put_out_dir;
875
876 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
877
878 new_inode->i_ctime = current_time(new_inode);
879 down_write(&F2FS_I(new_inode)->i_sem);
880 if (old_dir_entry)
881 f2fs_i_links_write(new_inode, false);
882 f2fs_i_links_write(new_inode, false);
883 up_write(&F2FS_I(new_inode)->i_sem);
884
885 if (!new_inode->i_nlink)
886 add_orphan_inode(new_inode);
887 else
888 release_orphan_inode(sbi);
889 } else {
890 f2fs_balance_fs(sbi, true);
891
892 f2fs_lock_op(sbi);
893
894 err = f2fs_add_link(new_dentry, old_inode);
895 if (err) {
896 f2fs_unlock_op(sbi);
897 goto out_whiteout;
898 }
899
900 if (old_dir_entry)
901 f2fs_i_links_write(new_dir, true);
902
903 /*
904 * old entry and new entry can locate in the same inline
905 * dentry in inode, when attaching new entry in inline dentry,
906 * it could force inline dentry conversion, after that,
907 * old_entry and old_page will point to wrong address, in
908 * order to avoid this, let's do the check and update here.
909 */
910 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
911 f2fs_put_page(old_page, 0);
912 old_page = NULL;
913
914 old_entry = f2fs_find_entry(old_dir,
915 &old_dentry->d_name, &old_page);
916 if (!old_entry) {
917 err = -ENOENT;
918 if (IS_ERR(old_page))
919 err = PTR_ERR(old_page);
920 f2fs_unlock_op(sbi);
921 goto out_whiteout;
922 }
923 }
924 }
925
926 down_write(&F2FS_I(old_inode)->i_sem);
927 if (!old_dir_entry || whiteout)
928 file_lost_pino(old_inode);
929 else
930 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
931 up_write(&F2FS_I(old_inode)->i_sem);
932
933 old_inode->i_ctime = current_time(old_inode);
934 f2fs_mark_inode_dirty_sync(old_inode, false);
935
936 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
937
938 if (whiteout) {
939 whiteout->i_state |= I_LINKABLE;
940 set_inode_flag(whiteout, FI_INC_LINK);
941 err = f2fs_add_link(old_dentry, whiteout);
942 if (err)
943 goto put_out_dir;
944 whiteout->i_state &= ~I_LINKABLE;
945 iput(whiteout);
946 }
947
948 if (old_dir_entry) {
949 if (old_dir != new_dir && !whiteout) {
950 f2fs_set_link(old_inode, old_dir_entry,
951 old_dir_page, new_dir);
952 } else {
953 f2fs_dentry_kunmap(old_inode, old_dir_page);
954 f2fs_put_page(old_dir_page, 0);
955 }
956 f2fs_i_links_write(old_dir, false);
957 }
958
959 f2fs_unlock_op(sbi);
960
961 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
962 f2fs_sync_fs(sbi->sb, 1);
963 return 0;
964
965 put_out_dir:
966 f2fs_unlock_op(sbi);
967 if (new_page) {
968 f2fs_dentry_kunmap(new_dir, new_page);
969 f2fs_put_page(new_page, 0);
970 }
971 out_whiteout:
972 if (whiteout)
973 iput(whiteout);
974 out_dir:
975 if (old_dir_entry) {
976 f2fs_dentry_kunmap(old_inode, old_dir_page);
977 f2fs_put_page(old_dir_page, 0);
978 }
979 out_old:
980 f2fs_dentry_kunmap(old_dir, old_page);
981 f2fs_put_page(old_page, 0);
982 out:
983 return err;
984 }
985
986 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
987 struct inode *new_dir, struct dentry *new_dentry)
988 {
989 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
990 struct inode *old_inode = d_inode(old_dentry);
991 struct inode *new_inode = d_inode(new_dentry);
992 struct page *old_dir_page, *new_dir_page;
993 struct page *old_page, *new_page;
994 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
995 struct f2fs_dir_entry *old_entry, *new_entry;
996 int old_nlink = 0, new_nlink = 0;
997 int err = -ENOENT;
998
999 if (unlikely(f2fs_cp_error(sbi)))
1000 return -EIO;
1001
1002 if ((f2fs_encrypted_inode(old_dir) &&
1003 !fscrypt_has_encryption_key(old_dir)) ||
1004 (f2fs_encrypted_inode(new_dir) &&
1005 !fscrypt_has_encryption_key(new_dir)))
1006 return -ENOKEY;
1007
1008 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
1009 (old_dir != new_dir) &&
1010 (!fscrypt_has_permitted_context(new_dir, old_inode) ||
1011 !fscrypt_has_permitted_context(old_dir, new_inode)))
1012 return -EPERM;
1013
1014 if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1015 !projid_eq(F2FS_I(new_dir)->i_projid,
1016 F2FS_I(old_dentry->d_inode)->i_projid)) ||
1017 (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1018 !projid_eq(F2FS_I(old_dir)->i_projid,
1019 F2FS_I(new_dentry->d_inode)->i_projid)))
1020 return -EXDEV;
1021
1022 err = dquot_initialize(old_dir);
1023 if (err)
1024 goto out;
1025
1026 err = dquot_initialize(new_dir);
1027 if (err)
1028 goto out;
1029
1030 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1031 if (!old_entry) {
1032 if (IS_ERR(old_page))
1033 err = PTR_ERR(old_page);
1034 goto out;
1035 }
1036
1037 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1038 if (!new_entry) {
1039 if (IS_ERR(new_page))
1040 err = PTR_ERR(new_page);
1041 goto out_old;
1042 }
1043
1044 /* prepare for updating ".." directory entry info later */
1045 if (old_dir != new_dir) {
1046 if (S_ISDIR(old_inode->i_mode)) {
1047 old_dir_entry = f2fs_parent_dir(old_inode,
1048 &old_dir_page);
1049 if (!old_dir_entry) {
1050 if (IS_ERR(old_dir_page))
1051 err = PTR_ERR(old_dir_page);
1052 goto out_new;
1053 }
1054 }
1055
1056 if (S_ISDIR(new_inode->i_mode)) {
1057 new_dir_entry = f2fs_parent_dir(new_inode,
1058 &new_dir_page);
1059 if (!new_dir_entry) {
1060 if (IS_ERR(new_dir_page))
1061 err = PTR_ERR(new_dir_page);
1062 goto out_old_dir;
1063 }
1064 }
1065 }
1066
1067 /*
1068 * If cross rename between file and directory those are not
1069 * in the same directory, we will inc nlink of file's parent
1070 * later, so we should check upper boundary of its nlink.
1071 */
1072 if ((!old_dir_entry || !new_dir_entry) &&
1073 old_dir_entry != new_dir_entry) {
1074 old_nlink = old_dir_entry ? -1 : 1;
1075 new_nlink = -old_nlink;
1076 err = -EMLINK;
1077 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1078 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1079 goto out_new_dir;
1080 }
1081
1082 f2fs_balance_fs(sbi, true);
1083
1084 f2fs_lock_op(sbi);
1085
1086 /* update ".." directory entry info of old dentry */
1087 if (old_dir_entry)
1088 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1089
1090 /* update ".." directory entry info of new dentry */
1091 if (new_dir_entry)
1092 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1093
1094 /* update directory entry info of old dir inode */
1095 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1096
1097 down_write(&F2FS_I(old_inode)->i_sem);
1098 file_lost_pino(old_inode);
1099 up_write(&F2FS_I(old_inode)->i_sem);
1100
1101 old_dir->i_ctime = current_time(old_dir);
1102 if (old_nlink) {
1103 down_write(&F2FS_I(old_dir)->i_sem);
1104 f2fs_i_links_write(old_dir, old_nlink > 0);
1105 up_write(&F2FS_I(old_dir)->i_sem);
1106 }
1107 f2fs_mark_inode_dirty_sync(old_dir, false);
1108
1109 /* update directory entry info of new dir inode */
1110 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1111
1112 down_write(&F2FS_I(new_inode)->i_sem);
1113 file_lost_pino(new_inode);
1114 up_write(&F2FS_I(new_inode)->i_sem);
1115
1116 new_dir->i_ctime = current_time(new_dir);
1117 if (new_nlink) {
1118 down_write(&F2FS_I(new_dir)->i_sem);
1119 f2fs_i_links_write(new_dir, new_nlink > 0);
1120 up_write(&F2FS_I(new_dir)->i_sem);
1121 }
1122 f2fs_mark_inode_dirty_sync(new_dir, false);
1123
1124 f2fs_unlock_op(sbi);
1125
1126 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1127 f2fs_sync_fs(sbi->sb, 1);
1128 return 0;
1129 out_new_dir:
1130 if (new_dir_entry) {
1131 f2fs_dentry_kunmap(new_inode, new_dir_page);
1132 f2fs_put_page(new_dir_page, 0);
1133 }
1134 out_old_dir:
1135 if (old_dir_entry) {
1136 f2fs_dentry_kunmap(old_inode, old_dir_page);
1137 f2fs_put_page(old_dir_page, 0);
1138 }
1139 out_new:
1140 f2fs_dentry_kunmap(new_dir, new_page);
1141 f2fs_put_page(new_page, 0);
1142 out_old:
1143 f2fs_dentry_kunmap(old_dir, old_page);
1144 f2fs_put_page(old_page, 0);
1145 out:
1146 return err;
1147 }
1148
1149 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1150 struct inode *new_dir, struct dentry *new_dentry,
1151 unsigned int flags)
1152 {
1153 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1154 return -EINVAL;
1155
1156 if (flags & RENAME_EXCHANGE) {
1157 return f2fs_cross_rename(old_dir, old_dentry,
1158 new_dir, new_dentry);
1159 }
1160 /*
1161 * VFS has already handled the new dentry existence case,
1162 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1163 */
1164 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1165 }
1166
1167 static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
1168 {
1169 struct page *cpage = NULL;
1170 char *caddr, *paddr = NULL;
1171 struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1172 struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1173 struct fscrypt_symlink_data *sd;
1174 struct inode *inode = d_inode(dentry);
1175 u32 max_size = inode->i_sb->s_blocksize;
1176 int res;
1177
1178 res = fscrypt_get_encryption_info(inode);
1179 if (res)
1180 return ERR_PTR(res);
1181
1182 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1183 if (IS_ERR(cpage))
1184 return ERR_CAST(cpage);
1185 caddr = page_address(cpage);
1186
1187 /* Symlink is encrypted */
1188 sd = (struct fscrypt_symlink_data *)caddr;
1189 cstr.name = sd->encrypted_path;
1190 cstr.len = le16_to_cpu(sd->len);
1191
1192 /* this is broken symlink case */
1193 if (unlikely(cstr.len == 0)) {
1194 res = -ENOENT;
1195 goto errout;
1196 }
1197
1198 if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1199 /* Symlink data on the disk is corrupted */
1200 res = -EIO;
1201 goto errout;
1202 }
1203 res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1204 if (res)
1205 goto errout;
1206
1207 res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1208 if (res)
1209 goto errout;
1210
1211 /* this is broken symlink case */
1212 if (unlikely(pstr.name[0] == 0)) {
1213 res = -ENOENT;
1214 goto errout;
1215 }
1216
1217 paddr = pstr.name;
1218
1219 /* Null-terminate the name */
1220 paddr[pstr.len] = '\0';
1221
1222 put_page(cpage);
1223 return *cookie = paddr;
1224 errout:
1225 fscrypt_fname_free_buffer(&pstr);
1226 put_page(cpage);
1227 return ERR_PTR(res);
1228 }
1229
1230 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1231 .readlink = generic_readlink,
1232 .follow_link = f2fs_encrypted_follow_link,
1233 .put_link = kfree_put_link,
1234 .getattr = f2fs_getattr,
1235 .setattr = f2fs_setattr,
1236 #ifdef CONFIG_F2FS_FS_XATTR
1237 .setxattr = generic_setxattr,
1238 .getxattr = generic_getxattr,
1239 .listxattr = f2fs_listxattr,
1240 .removexattr = generic_removexattr,
1241 #endif
1242 };
1243
1244 const struct inode_operations f2fs_dir_inode_operations = {
1245 .create = f2fs_create,
1246 .lookup = f2fs_lookup,
1247 .link = f2fs_link,
1248 .unlink = f2fs_unlink,
1249 .symlink = f2fs_symlink,
1250 .mkdir = f2fs_mkdir,
1251 .rmdir = f2fs_rmdir,
1252 .mknod = f2fs_mknod,
1253 .rename2 = f2fs_rename2,
1254 .tmpfile = f2fs_tmpfile,
1255 .getattr = f2fs_getattr,
1256 .setattr = f2fs_setattr,
1257 .get_acl = f2fs_get_acl,
1258 .set_acl = f2fs_set_acl,
1259 #ifdef CONFIG_F2FS_FS_XATTR
1260 .setxattr = generic_setxattr,
1261 .getxattr = generic_getxattr,
1262 .listxattr = f2fs_listxattr,
1263 .removexattr = generic_removexattr,
1264 #endif
1265 };
1266
1267 const struct inode_operations f2fs_symlink_inode_operations = {
1268 .readlink = generic_readlink,
1269 .follow_link = f2fs_follow_link,
1270 .put_link = page_put_link,
1271 .getattr = f2fs_getattr,
1272 .setattr = f2fs_setattr,
1273 #ifdef CONFIG_F2FS_FS_XATTR
1274 .setxattr = generic_setxattr,
1275 .getxattr = generic_getxattr,
1276 .listxattr = f2fs_listxattr,
1277 .removexattr = generic_removexattr,
1278 #endif
1279 };
1280
1281 const struct inode_operations f2fs_special_inode_operations = {
1282 .getattr = f2fs_getattr,
1283 .setattr = f2fs_setattr,
1284 .get_acl = f2fs_get_acl,
1285 .set_acl = f2fs_set_acl,
1286 #ifdef CONFIG_F2FS_FS_XATTR
1287 .setxattr = generic_setxattr,
1288 .getxattr = generic_getxattr,
1289 .listxattr = f2fs_listxattr,
1290 .removexattr = generic_removexattr,
1291 #endif
1292 };