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fs crypto: move per-file encryption from f2fs tree to fs/crypto
[deliverable/linux.git] / fs / f2fs / namei.c
1 /*
2 * fs/f2fs/namei.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11 #include <linux/fs.h>
12 #include <linux/f2fs_fs.h>
13 #include <linux/pagemap.h>
14 #include <linux/sched.h>
15 #include <linux/ctype.h>
16 #include <linux/dcache.h>
17 #include <linux/namei.h>
18
19 #include "f2fs.h"
20 #include "node.h"
21 #include "xattr.h"
22 #include "acl.h"
23 #include <trace/events/f2fs.h>
24
25 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
26 {
27 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
28 nid_t ino;
29 struct inode *inode;
30 bool nid_free = false;
31 int err;
32
33 inode = new_inode(dir->i_sb);
34 if (!inode)
35 return ERR_PTR(-ENOMEM);
36
37 f2fs_lock_op(sbi);
38 if (!alloc_nid(sbi, &ino)) {
39 f2fs_unlock_op(sbi);
40 err = -ENOSPC;
41 goto fail;
42 }
43 f2fs_unlock_op(sbi);
44
45 inode_init_owner(inode, dir, mode);
46
47 inode->i_ino = ino;
48 inode->i_blocks = 0;
49 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
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 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
64 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
65 if (f2fs_may_inline_dentry(inode))
66 set_inode_flag(F2FS_I(inode), FI_INLINE_DENTRY);
67
68 f2fs_init_extent_tree(inode, NULL);
69
70 stat_inc_inline_xattr(inode);
71 stat_inc_inline_inode(inode);
72 stat_inc_inline_dir(inode);
73
74 trace_f2fs_new_inode(inode, 0);
75 mark_inode_dirty(inode);
76 return inode;
77
78 fail:
79 trace_f2fs_new_inode(inode, err);
80 make_bad_inode(inode);
81 if (nid_free)
82 set_inode_flag(F2FS_I(inode), FI_FREE_NID);
83 iput(inode);
84 return ERR_PTR(err);
85 }
86
87 static int is_multimedia_file(const unsigned char *s, const char *sub)
88 {
89 size_t slen = strlen(s);
90 size_t sublen = strlen(sub);
91
92 /*
93 * filename format of multimedia file should be defined as:
94 * "filename + '.' + extension".
95 */
96 if (slen < sublen + 2)
97 return 0;
98
99 if (s[slen - sublen - 1] != '.')
100 return 0;
101
102 return !strncasecmp(s + slen - sublen, sub, sublen);
103 }
104
105 /*
106 * Set multimedia files as cold files for hot/cold data separation
107 */
108 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
109 const unsigned char *name)
110 {
111 int i;
112 __u8 (*extlist)[8] = sbi->raw_super->extension_list;
113
114 int count = le32_to_cpu(sbi->raw_super->extension_count);
115 for (i = 0; i < count; i++) {
116 if (is_multimedia_file(name, extlist[i])) {
117 file_set_cold(inode);
118 break;
119 }
120 }
121 }
122
123 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
124 bool excl)
125 {
126 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
127 struct inode *inode;
128 nid_t ino = 0;
129 int err;
130
131 inode = f2fs_new_inode(dir, mode);
132 if (IS_ERR(inode))
133 return PTR_ERR(inode);
134
135 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
136 set_cold_files(sbi, inode, dentry->d_name.name);
137
138 inode->i_op = &f2fs_file_inode_operations;
139 inode->i_fop = &f2fs_file_operations;
140 inode->i_mapping->a_ops = &f2fs_dblock_aops;
141 ino = inode->i_ino;
142
143 f2fs_balance_fs(sbi, true);
144
145 f2fs_lock_op(sbi);
146 err = f2fs_add_link(dentry, inode);
147 if (err)
148 goto out;
149 f2fs_unlock_op(sbi);
150
151 alloc_nid_done(sbi, ino);
152
153 d_instantiate(dentry, inode);
154 unlock_new_inode(inode);
155
156 if (IS_DIRSYNC(dir))
157 f2fs_sync_fs(sbi->sb, 1);
158 return 0;
159 out:
160 handle_failed_inode(inode);
161 return err;
162 }
163
164 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
165 struct dentry *dentry)
166 {
167 struct inode *inode = d_inode(old_dentry);
168 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
169 int err;
170
171 if (f2fs_encrypted_inode(dir) &&
172 !fscrypt_has_permitted_context(dir, inode))
173 return -EPERM;
174
175 f2fs_balance_fs(sbi, true);
176
177 inode->i_ctime = CURRENT_TIME;
178 ihold(inode);
179
180 set_inode_flag(F2FS_I(inode), FI_INC_LINK);
181 f2fs_lock_op(sbi);
182 err = f2fs_add_link(dentry, inode);
183 if (err)
184 goto out;
185 f2fs_unlock_op(sbi);
186
187 d_instantiate(dentry, inode);
188
189 if (IS_DIRSYNC(dir))
190 f2fs_sync_fs(sbi->sb, 1);
191 return 0;
192 out:
193 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
194 iput(inode);
195 f2fs_unlock_op(sbi);
196 return err;
197 }
198
199 struct dentry *f2fs_get_parent(struct dentry *child)
200 {
201 struct qstr dotdot = QSTR_INIT("..", 2);
202 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot);
203 if (!ino)
204 return ERR_PTR(-ENOENT);
205 return d_obtain_alias(f2fs_iget(d_inode(child)->i_sb, ino));
206 }
207
208 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
209 {
210 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
211 struct qstr dot = QSTR_INIT(".", 1);
212 struct qstr dotdot = QSTR_INIT("..", 2);
213 struct f2fs_dir_entry *de;
214 struct page *page;
215 int err = 0;
216
217 if (f2fs_readonly(sbi->sb)) {
218 f2fs_msg(sbi->sb, KERN_INFO,
219 "skip recovering inline_dots inode (ino:%lu, pino:%u) "
220 "in readonly mountpoint", dir->i_ino, pino);
221 return 0;
222 }
223
224 f2fs_balance_fs(sbi, true);
225
226 f2fs_lock_op(sbi);
227
228 de = f2fs_find_entry(dir, &dot, &page);
229 if (de) {
230 f2fs_dentry_kunmap(dir, page);
231 f2fs_put_page(page, 0);
232 } else {
233 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
234 if (err)
235 goto out;
236 }
237
238 de = f2fs_find_entry(dir, &dotdot, &page);
239 if (de) {
240 f2fs_dentry_kunmap(dir, page);
241 f2fs_put_page(page, 0);
242 } else {
243 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
244 }
245 out:
246 if (!err) {
247 clear_inode_flag(F2FS_I(dir), FI_INLINE_DOTS);
248 mark_inode_dirty(dir);
249 }
250
251 f2fs_unlock_op(sbi);
252 return err;
253 }
254
255 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
256 unsigned int flags)
257 {
258 struct inode *inode = NULL;
259 struct f2fs_dir_entry *de;
260 struct page *page;
261 nid_t ino;
262 int err = 0;
263 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
264
265 if (dentry->d_name.len > F2FS_NAME_LEN)
266 return ERR_PTR(-ENAMETOOLONG);
267
268 de = f2fs_find_entry(dir, &dentry->d_name, &page);
269 if (!de)
270 return d_splice_alias(inode, dentry);
271
272 ino = le32_to_cpu(de->ino);
273 f2fs_dentry_kunmap(dir, page);
274 f2fs_put_page(page, 0);
275
276 inode = f2fs_iget(dir->i_sb, ino);
277 if (IS_ERR(inode))
278 return ERR_CAST(inode);
279
280 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
281 err = __recover_dot_dentries(dir, root_ino);
282 if (err)
283 goto err_out;
284 }
285
286 if (f2fs_has_inline_dots(inode)) {
287 err = __recover_dot_dentries(inode, dir->i_ino);
288 if (err)
289 goto err_out;
290 }
291 return d_splice_alias(inode, dentry);
292
293 err_out:
294 iget_failed(inode);
295 return ERR_PTR(err);
296 }
297
298 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
299 {
300 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
301 struct inode *inode = d_inode(dentry);
302 struct f2fs_dir_entry *de;
303 struct page *page;
304 int err = -ENOENT;
305
306 trace_f2fs_unlink_enter(dir, dentry);
307
308 de = f2fs_find_entry(dir, &dentry->d_name, &page);
309 if (!de)
310 goto fail;
311
312 f2fs_balance_fs(sbi, true);
313
314 f2fs_lock_op(sbi);
315 err = acquire_orphan_inode(sbi);
316 if (err) {
317 f2fs_unlock_op(sbi);
318 f2fs_dentry_kunmap(dir, page);
319 f2fs_put_page(page, 0);
320 goto fail;
321 }
322 f2fs_delete_entry(de, page, dir, inode);
323 f2fs_unlock_op(sbi);
324
325 /* In order to evict this inode, we set it dirty */
326 mark_inode_dirty(inode);
327
328 if (IS_DIRSYNC(dir))
329 f2fs_sync_fs(sbi->sb, 1);
330 fail:
331 trace_f2fs_unlink_exit(inode, err);
332 return err;
333 }
334
335 static const char *f2fs_get_link(struct dentry *dentry,
336 struct inode *inode,
337 struct delayed_call *done)
338 {
339 const char *link = page_get_link(dentry, inode, done);
340 if (!IS_ERR(link) && !*link) {
341 /* this is broken symlink case */
342 do_delayed_call(done);
343 clear_delayed_call(done);
344 link = ERR_PTR(-ENOENT);
345 }
346 return link;
347 }
348
349 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
350 const char *symname)
351 {
352 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
353 struct inode *inode;
354 size_t len = strlen(symname);
355 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
356 struct fscrypt_symlink_data *sd = NULL;
357 int err;
358
359 if (f2fs_encrypted_inode(dir)) {
360 err = fscrypt_get_encryption_info(dir);
361 if (err)
362 return err;
363
364 if (!fscrypt_has_encryption_key(dir))
365 return -EPERM;
366
367 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
368 sizeof(struct fscrypt_symlink_data));
369 }
370
371 if (disk_link.len > dir->i_sb->s_blocksize)
372 return -ENAMETOOLONG;
373
374 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
375 if (IS_ERR(inode))
376 return PTR_ERR(inode);
377
378 if (f2fs_encrypted_inode(inode))
379 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
380 else
381 inode->i_op = &f2fs_symlink_inode_operations;
382 inode_nohighmem(inode);
383 inode->i_mapping->a_ops = &f2fs_dblock_aops;
384
385 f2fs_balance_fs(sbi, true);
386
387 f2fs_lock_op(sbi);
388 err = f2fs_add_link(dentry, inode);
389 if (err)
390 goto out;
391 f2fs_unlock_op(sbi);
392 alloc_nid_done(sbi, inode->i_ino);
393
394 if (f2fs_encrypted_inode(inode)) {
395 struct qstr istr = QSTR_INIT(symname, len);
396 struct fscrypt_str ostr;
397
398 sd = kzalloc(disk_link.len, GFP_NOFS);
399 if (!sd) {
400 err = -ENOMEM;
401 goto err_out;
402 }
403
404 err = fscrypt_get_encryption_info(inode);
405 if (err)
406 goto err_out;
407
408 if (!fscrypt_has_encryption_key(inode)) {
409 err = -EPERM;
410 goto err_out;
411 }
412
413 ostr.name = sd->encrypted_path;
414 ostr.len = disk_link.len;
415 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
416 if (err < 0)
417 goto err_out;
418
419 sd->len = cpu_to_le16(ostr.len);
420 disk_link.name = (char *)sd;
421 }
422
423 err = page_symlink(inode, disk_link.name, disk_link.len);
424
425 err_out:
426 d_instantiate(dentry, inode);
427 unlock_new_inode(inode);
428
429 /*
430 * Let's flush symlink data in order to avoid broken symlink as much as
431 * possible. Nevertheless, fsyncing is the best way, but there is no
432 * way to get a file descriptor in order to flush that.
433 *
434 * Note that, it needs to do dir->fsync to make this recoverable.
435 * If the symlink path is stored into inline_data, there is no
436 * performance regression.
437 */
438 if (!err) {
439 filemap_write_and_wait_range(inode->i_mapping, 0,
440 disk_link.len - 1);
441
442 if (IS_DIRSYNC(dir))
443 f2fs_sync_fs(sbi->sb, 1);
444 } else {
445 f2fs_unlink(dir, dentry);
446 }
447
448 kfree(sd);
449 return err;
450 out:
451 handle_failed_inode(inode);
452 return err;
453 }
454
455 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
456 {
457 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
458 struct inode *inode;
459 int err;
460
461 inode = f2fs_new_inode(dir, S_IFDIR | mode);
462 if (IS_ERR(inode))
463 return PTR_ERR(inode);
464
465 inode->i_op = &f2fs_dir_inode_operations;
466 inode->i_fop = &f2fs_dir_operations;
467 inode->i_mapping->a_ops = &f2fs_dblock_aops;
468 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
469
470 f2fs_balance_fs(sbi, true);
471
472 set_inode_flag(F2FS_I(inode), FI_INC_LINK);
473 f2fs_lock_op(sbi);
474 err = f2fs_add_link(dentry, inode);
475 if (err)
476 goto out_fail;
477 f2fs_unlock_op(sbi);
478
479 alloc_nid_done(sbi, inode->i_ino);
480
481 d_instantiate(dentry, inode);
482 unlock_new_inode(inode);
483
484 if (IS_DIRSYNC(dir))
485 f2fs_sync_fs(sbi->sb, 1);
486 return 0;
487
488 out_fail:
489 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
490 handle_failed_inode(inode);
491 return err;
492 }
493
494 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
495 {
496 struct inode *inode = d_inode(dentry);
497 if (f2fs_empty_dir(inode))
498 return f2fs_unlink(dir, dentry);
499 return -ENOTEMPTY;
500 }
501
502 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
503 umode_t mode, dev_t rdev)
504 {
505 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
506 struct inode *inode;
507 int err = 0;
508
509 inode = f2fs_new_inode(dir, mode);
510 if (IS_ERR(inode))
511 return PTR_ERR(inode);
512
513 init_special_inode(inode, inode->i_mode, rdev);
514 inode->i_op = &f2fs_special_inode_operations;
515
516 f2fs_balance_fs(sbi, true);
517
518 f2fs_lock_op(sbi);
519 err = f2fs_add_link(dentry, inode);
520 if (err)
521 goto out;
522 f2fs_unlock_op(sbi);
523
524 alloc_nid_done(sbi, inode->i_ino);
525
526 d_instantiate(dentry, inode);
527 unlock_new_inode(inode);
528
529 if (IS_DIRSYNC(dir))
530 f2fs_sync_fs(sbi->sb, 1);
531 return 0;
532 out:
533 handle_failed_inode(inode);
534 return err;
535 }
536
537 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
538 umode_t mode, struct inode **whiteout)
539 {
540 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
541 struct inode *inode;
542 int err;
543
544 inode = f2fs_new_inode(dir, mode);
545 if (IS_ERR(inode))
546 return PTR_ERR(inode);
547
548 if (whiteout) {
549 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
550 inode->i_op = &f2fs_special_inode_operations;
551 } else {
552 inode->i_op = &f2fs_file_inode_operations;
553 inode->i_fop = &f2fs_file_operations;
554 inode->i_mapping->a_ops = &f2fs_dblock_aops;
555 }
556
557 f2fs_balance_fs(sbi, true);
558
559 f2fs_lock_op(sbi);
560 err = acquire_orphan_inode(sbi);
561 if (err)
562 goto out;
563
564 err = f2fs_do_tmpfile(inode, dir);
565 if (err)
566 goto release_out;
567
568 /*
569 * add this non-linked tmpfile to orphan list, in this way we could
570 * remove all unused data of tmpfile after abnormal power-off.
571 */
572 add_orphan_inode(sbi, inode->i_ino);
573 f2fs_unlock_op(sbi);
574
575 alloc_nid_done(sbi, inode->i_ino);
576
577 if (whiteout) {
578 inode_dec_link_count(inode);
579 *whiteout = inode;
580 } else {
581 d_tmpfile(dentry, inode);
582 }
583 unlock_new_inode(inode);
584 return 0;
585
586 release_out:
587 release_orphan_inode(sbi);
588 out:
589 handle_failed_inode(inode);
590 return err;
591 }
592
593 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
594 {
595 if (f2fs_encrypted_inode(dir)) {
596 int err = fscrypt_get_encryption_info(dir);
597 if (err)
598 return err;
599 }
600
601 return __f2fs_tmpfile(dir, dentry, mode, NULL);
602 }
603
604 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
605 {
606 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
607 }
608
609 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
610 struct inode *new_dir, struct dentry *new_dentry,
611 unsigned int flags)
612 {
613 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
614 struct inode *old_inode = d_inode(old_dentry);
615 struct inode *new_inode = d_inode(new_dentry);
616 struct inode *whiteout = NULL;
617 struct page *old_dir_page;
618 struct page *old_page, *new_page = NULL;
619 struct f2fs_dir_entry *old_dir_entry = NULL;
620 struct f2fs_dir_entry *old_entry;
621 struct f2fs_dir_entry *new_entry;
622 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
623 int err = -ENOENT;
624
625 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
626 !fscrypt_has_permitted_context(new_dir, old_inode)) {
627 err = -EPERM;
628 goto out;
629 }
630
631 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
632 if (!old_entry)
633 goto out;
634
635 if (S_ISDIR(old_inode->i_mode)) {
636 err = -EIO;
637 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
638 if (!old_dir_entry)
639 goto out_old;
640 }
641
642 if (flags & RENAME_WHITEOUT) {
643 err = f2fs_create_whiteout(old_dir, &whiteout);
644 if (err)
645 goto out_dir;
646 }
647
648 if (new_inode) {
649
650 err = -ENOTEMPTY;
651 if (old_dir_entry && !f2fs_empty_dir(new_inode))
652 goto out_whiteout;
653
654 err = -ENOENT;
655 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
656 &new_page);
657 if (!new_entry)
658 goto out_whiteout;
659
660 f2fs_balance_fs(sbi, true);
661
662 f2fs_lock_op(sbi);
663
664 err = acquire_orphan_inode(sbi);
665 if (err)
666 goto put_out_dir;
667
668 err = update_dent_inode(old_inode, new_inode,
669 &new_dentry->d_name);
670 if (err) {
671 release_orphan_inode(sbi);
672 goto put_out_dir;
673 }
674
675 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
676
677 new_inode->i_ctime = CURRENT_TIME;
678 down_write(&F2FS_I(new_inode)->i_sem);
679 if (old_dir_entry)
680 drop_nlink(new_inode);
681 drop_nlink(new_inode);
682 up_write(&F2FS_I(new_inode)->i_sem);
683
684 mark_inode_dirty(new_inode);
685
686 if (!new_inode->i_nlink)
687 add_orphan_inode(sbi, new_inode->i_ino);
688 else
689 release_orphan_inode(sbi);
690
691 update_inode_page(old_inode);
692 update_inode_page(new_inode);
693 } else {
694 f2fs_balance_fs(sbi, true);
695
696 f2fs_lock_op(sbi);
697
698 err = f2fs_add_link(new_dentry, old_inode);
699 if (err) {
700 f2fs_unlock_op(sbi);
701 goto out_whiteout;
702 }
703
704 if (old_dir_entry) {
705 inc_nlink(new_dir);
706 update_inode_page(new_dir);
707 }
708
709 /*
710 * old entry and new entry can locate in the same inline
711 * dentry in inode, when attaching new entry in inline dentry,
712 * it could force inline dentry conversion, after that,
713 * old_entry and old_page will point to wrong address, in
714 * order to avoid this, let's do the check and update here.
715 */
716 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
717 f2fs_put_page(old_page, 0);
718 old_page = NULL;
719
720 old_entry = f2fs_find_entry(old_dir,
721 &old_dentry->d_name, &old_page);
722 if (!old_entry) {
723 err = -EIO;
724 f2fs_unlock_op(sbi);
725 goto out_whiteout;
726 }
727 }
728 }
729
730 down_write(&F2FS_I(old_inode)->i_sem);
731 file_lost_pino(old_inode);
732 if (new_inode && file_enc_name(new_inode))
733 file_set_enc_name(old_inode);
734 up_write(&F2FS_I(old_inode)->i_sem);
735
736 old_inode->i_ctime = CURRENT_TIME;
737 mark_inode_dirty(old_inode);
738
739 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
740
741 if (whiteout) {
742 whiteout->i_state |= I_LINKABLE;
743 set_inode_flag(F2FS_I(whiteout), FI_INC_LINK);
744 err = f2fs_add_link(old_dentry, whiteout);
745 if (err)
746 goto put_out_dir;
747 whiteout->i_state &= ~I_LINKABLE;
748 iput(whiteout);
749 }
750
751 if (old_dir_entry) {
752 if (old_dir != new_dir && !whiteout) {
753 f2fs_set_link(old_inode, old_dir_entry,
754 old_dir_page, new_dir);
755 update_inode_page(old_inode);
756 } else {
757 f2fs_dentry_kunmap(old_inode, old_dir_page);
758 f2fs_put_page(old_dir_page, 0);
759 }
760 drop_nlink(old_dir);
761 mark_inode_dirty(old_dir);
762 update_inode_page(old_dir);
763 }
764
765 f2fs_unlock_op(sbi);
766
767 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
768 f2fs_sync_fs(sbi->sb, 1);
769 return 0;
770
771 put_out_dir:
772 f2fs_unlock_op(sbi);
773 if (new_page) {
774 f2fs_dentry_kunmap(new_dir, new_page);
775 f2fs_put_page(new_page, 0);
776 }
777 out_whiteout:
778 if (whiteout)
779 iput(whiteout);
780 out_dir:
781 if (old_dir_entry) {
782 f2fs_dentry_kunmap(old_inode, old_dir_page);
783 f2fs_put_page(old_dir_page, 0);
784 }
785 out_old:
786 f2fs_dentry_kunmap(old_dir, old_page);
787 f2fs_put_page(old_page, 0);
788 out:
789 return err;
790 }
791
792 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
793 struct inode *new_dir, struct dentry *new_dentry)
794 {
795 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
796 struct inode *old_inode = d_inode(old_dentry);
797 struct inode *new_inode = d_inode(new_dentry);
798 struct page *old_dir_page, *new_dir_page;
799 struct page *old_page, *new_page;
800 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
801 struct f2fs_dir_entry *old_entry, *new_entry;
802 int old_nlink = 0, new_nlink = 0;
803 int err = -ENOENT;
804
805 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
806 (old_dir != new_dir) &&
807 (!fscrypt_has_permitted_context(new_dir, old_inode) ||
808 !fscrypt_has_permitted_context(old_dir, new_inode)))
809 return -EPERM;
810
811 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
812 if (!old_entry)
813 goto out;
814
815 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
816 if (!new_entry)
817 goto out_old;
818
819 /* prepare for updating ".." directory entry info later */
820 if (old_dir != new_dir) {
821 if (S_ISDIR(old_inode->i_mode)) {
822 err = -EIO;
823 old_dir_entry = f2fs_parent_dir(old_inode,
824 &old_dir_page);
825 if (!old_dir_entry)
826 goto out_new;
827 }
828
829 if (S_ISDIR(new_inode->i_mode)) {
830 err = -EIO;
831 new_dir_entry = f2fs_parent_dir(new_inode,
832 &new_dir_page);
833 if (!new_dir_entry)
834 goto out_old_dir;
835 }
836 }
837
838 /*
839 * If cross rename between file and directory those are not
840 * in the same directory, we will inc nlink of file's parent
841 * later, so we should check upper boundary of its nlink.
842 */
843 if ((!old_dir_entry || !new_dir_entry) &&
844 old_dir_entry != new_dir_entry) {
845 old_nlink = old_dir_entry ? -1 : 1;
846 new_nlink = -old_nlink;
847 err = -EMLINK;
848 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
849 (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
850 goto out_new_dir;
851 }
852
853 f2fs_balance_fs(sbi, true);
854
855 f2fs_lock_op(sbi);
856
857 err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
858 if (err)
859 goto out_unlock;
860 if (file_enc_name(new_inode))
861 file_set_enc_name(old_inode);
862
863 err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
864 if (err)
865 goto out_undo;
866 if (file_enc_name(old_inode))
867 file_set_enc_name(new_inode);
868
869 /* update ".." directory entry info of old dentry */
870 if (old_dir_entry)
871 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
872
873 /* update ".." directory entry info of new dentry */
874 if (new_dir_entry)
875 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
876
877 /* update directory entry info of old dir inode */
878 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
879
880 down_write(&F2FS_I(old_inode)->i_sem);
881 file_lost_pino(old_inode);
882 up_write(&F2FS_I(old_inode)->i_sem);
883
884 update_inode_page(old_inode);
885
886 old_dir->i_ctime = CURRENT_TIME;
887 if (old_nlink) {
888 down_write(&F2FS_I(old_dir)->i_sem);
889 if (old_nlink < 0)
890 drop_nlink(old_dir);
891 else
892 inc_nlink(old_dir);
893 up_write(&F2FS_I(old_dir)->i_sem);
894 }
895 mark_inode_dirty(old_dir);
896 update_inode_page(old_dir);
897
898 /* update directory entry info of new dir inode */
899 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
900
901 down_write(&F2FS_I(new_inode)->i_sem);
902 file_lost_pino(new_inode);
903 up_write(&F2FS_I(new_inode)->i_sem);
904
905 update_inode_page(new_inode);
906
907 new_dir->i_ctime = CURRENT_TIME;
908 if (new_nlink) {
909 down_write(&F2FS_I(new_dir)->i_sem);
910 if (new_nlink < 0)
911 drop_nlink(new_dir);
912 else
913 inc_nlink(new_dir);
914 up_write(&F2FS_I(new_dir)->i_sem);
915 }
916 mark_inode_dirty(new_dir);
917 update_inode_page(new_dir);
918
919 f2fs_unlock_op(sbi);
920
921 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
922 f2fs_sync_fs(sbi->sb, 1);
923 return 0;
924 out_undo:
925 /*
926 * Still we may fail to recover name info of f2fs_inode here
927 * Drop it, once its name is set as encrypted
928 */
929 update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
930 out_unlock:
931 f2fs_unlock_op(sbi);
932 out_new_dir:
933 if (new_dir_entry) {
934 f2fs_dentry_kunmap(new_inode, new_dir_page);
935 f2fs_put_page(new_dir_page, 0);
936 }
937 out_old_dir:
938 if (old_dir_entry) {
939 f2fs_dentry_kunmap(old_inode, old_dir_page);
940 f2fs_put_page(old_dir_page, 0);
941 }
942 out_new:
943 f2fs_dentry_kunmap(new_dir, new_page);
944 f2fs_put_page(new_page, 0);
945 out_old:
946 f2fs_dentry_kunmap(old_dir, old_page);
947 f2fs_put_page(old_page, 0);
948 out:
949 return err;
950 }
951
952 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
953 struct inode *new_dir, struct dentry *new_dentry,
954 unsigned int flags)
955 {
956 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
957 return -EINVAL;
958
959 if (flags & RENAME_EXCHANGE) {
960 return f2fs_cross_rename(old_dir, old_dentry,
961 new_dir, new_dentry);
962 }
963 /*
964 * VFS has already handled the new dentry existence case,
965 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
966 */
967 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
968 }
969
970 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
971 struct inode *inode,
972 struct delayed_call *done)
973 {
974 struct page *cpage = NULL;
975 char *caddr, *paddr = NULL;
976 struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
977 struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
978 struct fscrypt_symlink_data *sd;
979 loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
980 u32 max_size = inode->i_sb->s_blocksize;
981 int res;
982
983 if (!dentry)
984 return ERR_PTR(-ECHILD);
985
986 res = fscrypt_get_encryption_info(inode);
987 if (res)
988 return ERR_PTR(res);
989
990 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
991 if (IS_ERR(cpage))
992 return ERR_CAST(cpage);
993 caddr = page_address(cpage);
994 caddr[size] = 0;
995
996 /* Symlink is encrypted */
997 sd = (struct fscrypt_symlink_data *)caddr;
998 cstr.name = sd->encrypted_path;
999 cstr.len = le16_to_cpu(sd->len);
1000
1001 /* this is broken symlink case */
1002 if (unlikely(cstr.len == 0)) {
1003 res = -ENOENT;
1004 goto errout;
1005 }
1006
1007 /* this is broken symlink case */
1008 if (unlikely(cstr.name[0] == 0)) {
1009 res = -ENOENT;
1010 goto errout;
1011 }
1012
1013 if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1014 /* Symlink data on the disk is corrupted */
1015 res = -EIO;
1016 goto errout;
1017 }
1018 res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1019 if (res)
1020 goto errout;
1021
1022 res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1023 if (res < 0)
1024 goto errout;
1025
1026 paddr = pstr.name;
1027
1028 /* Null-terminate the name */
1029 paddr[res] = '\0';
1030
1031 page_cache_release(cpage);
1032 set_delayed_call(done, kfree_link, paddr);
1033 return paddr;
1034 errout:
1035 fscrypt_fname_free_buffer(&pstr);
1036 page_cache_release(cpage);
1037 return ERR_PTR(res);
1038 }
1039
1040 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1041 .readlink = generic_readlink,
1042 .get_link = f2fs_encrypted_get_link,
1043 .getattr = f2fs_getattr,
1044 .setattr = f2fs_setattr,
1045 #ifdef CONFIG_F2FS_FS_XATTR
1046 .setxattr = generic_setxattr,
1047 .getxattr = generic_getxattr,
1048 .listxattr = f2fs_listxattr,
1049 .removexattr = generic_removexattr,
1050 #endif
1051 };
1052
1053 const struct inode_operations f2fs_dir_inode_operations = {
1054 .create = f2fs_create,
1055 .lookup = f2fs_lookup,
1056 .link = f2fs_link,
1057 .unlink = f2fs_unlink,
1058 .symlink = f2fs_symlink,
1059 .mkdir = f2fs_mkdir,
1060 .rmdir = f2fs_rmdir,
1061 .mknod = f2fs_mknod,
1062 .rename2 = f2fs_rename2,
1063 .tmpfile = f2fs_tmpfile,
1064 .getattr = f2fs_getattr,
1065 .setattr = f2fs_setattr,
1066 .get_acl = f2fs_get_acl,
1067 .set_acl = f2fs_set_acl,
1068 #ifdef CONFIG_F2FS_FS_XATTR
1069 .setxattr = generic_setxattr,
1070 .getxattr = generic_getxattr,
1071 .listxattr = f2fs_listxattr,
1072 .removexattr = generic_removexattr,
1073 #endif
1074 };
1075
1076 const struct inode_operations f2fs_symlink_inode_operations = {
1077 .readlink = generic_readlink,
1078 .get_link = f2fs_get_link,
1079 .getattr = f2fs_getattr,
1080 .setattr = f2fs_setattr,
1081 #ifdef CONFIG_F2FS_FS_XATTR
1082 .setxattr = generic_setxattr,
1083 .getxattr = generic_getxattr,
1084 .listxattr = f2fs_listxattr,
1085 .removexattr = generic_removexattr,
1086 #endif
1087 };
1088
1089 const struct inode_operations f2fs_special_inode_operations = {
1090 .getattr = f2fs_getattr,
1091 .setattr = f2fs_setattr,
1092 .get_acl = f2fs_get_acl,
1093 .set_acl = f2fs_set_acl,
1094 #ifdef CONFIG_F2FS_FS_XATTR
1095 .setxattr = generic_setxattr,
1096 .getxattr = generic_getxattr,
1097 .listxattr = f2fs_listxattr,
1098 .removexattr = generic_removexattr,
1099 #endif
1100 };
Linux kernel - Deliverables
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