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b3c423a645bc84b97c46433ac05a718dd19892e1
[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 !f2fs_is_child_context_consistent_with_parent(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 f2fs_str disk_link = FSTR_INIT((char *)symname, len + 1);
356 struct f2fs_encrypted_symlink_data *sd = NULL;
357 int err;
358
359 if (f2fs_encrypted_inode(dir)) {
360 err = f2fs_get_encryption_info(dir);
361 if (err)
362 return err;
363
364 if (!f2fs_encrypted_inode(dir))
365 return -EPERM;
366
367 disk_link.len = (f2fs_fname_encrypted_size(dir, len) +
368 sizeof(struct f2fs_encrypted_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 f2fs_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 = f2fs_get_encryption_info(inode);
405 if (err)
406 goto err_out;
407
408 if (!f2fs_encrypted_inode(inode)) {
409 err = -EPERM;
410 goto err_out;
411 }
412
413 ostr.name = sd->encrypted_path;
414 ostr.len = disk_link.len;
415 err = f2fs_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 = f2fs_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 !f2fs_is_child_context_consistent_with_parent(new_dir,
627 old_inode)) {
628 err = -EPERM;
629 goto out;
630 }
631
632 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
633 if (!old_entry)
634 goto out;
635
636 if (S_ISDIR(old_inode->i_mode)) {
637 err = -EIO;
638 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
639 if (!old_dir_entry)
640 goto out_old;
641 }
642
643 if (flags & RENAME_WHITEOUT) {
644 err = f2fs_create_whiteout(old_dir, &whiteout);
645 if (err)
646 goto out_dir;
647 }
648
649 if (new_inode) {
650
651 err = -ENOTEMPTY;
652 if (old_dir_entry && !f2fs_empty_dir(new_inode))
653 goto out_whiteout;
654
655 err = -ENOENT;
656 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
657 &new_page);
658 if (!new_entry)
659 goto out_whiteout;
660
661 f2fs_balance_fs(sbi, true);
662
663 f2fs_lock_op(sbi);
664
665 err = acquire_orphan_inode(sbi);
666 if (err)
667 goto put_out_dir;
668
669 err = update_dent_inode(old_inode, new_inode,
670 &new_dentry->d_name);
671 if (err) {
672 release_orphan_inode(sbi);
673 goto put_out_dir;
674 }
675
676 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
677
678 new_inode->i_ctime = CURRENT_TIME;
679 down_write(&F2FS_I(new_inode)->i_sem);
680 if (old_dir_entry)
681 drop_nlink(new_inode);
682 drop_nlink(new_inode);
683 up_write(&F2FS_I(new_inode)->i_sem);
684
685 mark_inode_dirty(new_inode);
686
687 if (!new_inode->i_nlink)
688 add_orphan_inode(sbi, new_inode->i_ino);
689 else
690 release_orphan_inode(sbi);
691
692 update_inode_page(old_inode);
693 update_inode_page(new_inode);
694 } else {
695 f2fs_balance_fs(sbi, true);
696
697 f2fs_lock_op(sbi);
698
699 err = f2fs_add_link(new_dentry, old_inode);
700 if (err) {
701 f2fs_unlock_op(sbi);
702 goto out_whiteout;
703 }
704
705 if (old_dir_entry) {
706 inc_nlink(new_dir);
707 update_inode_page(new_dir);
708 }
709
710 /*
711 * old entry and new entry can locate in the same inline
712 * dentry in inode, when attaching new entry in inline dentry,
713 * it could force inline dentry conversion, after that,
714 * old_entry and old_page will point to wrong address, in
715 * order to avoid this, let's do the check and update here.
716 */
717 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
718 f2fs_put_page(old_page, 0);
719 old_page = NULL;
720
721 old_entry = f2fs_find_entry(old_dir,
722 &old_dentry->d_name, &old_page);
723 if (!old_entry) {
724 err = -EIO;
725 f2fs_unlock_op(sbi);
726 goto out_whiteout;
727 }
728 }
729 }
730
731 down_write(&F2FS_I(old_inode)->i_sem);
732 file_lost_pino(old_inode);
733 if (new_inode && file_enc_name(new_inode))
734 file_set_enc_name(old_inode);
735 up_write(&F2FS_I(old_inode)->i_sem);
736
737 old_inode->i_ctime = CURRENT_TIME;
738 mark_inode_dirty(old_inode);
739
740 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
741
742 if (whiteout) {
743 whiteout->i_state |= I_LINKABLE;
744 set_inode_flag(F2FS_I(whiteout), FI_INC_LINK);
745 err = f2fs_add_link(old_dentry, whiteout);
746 if (err)
747 goto put_out_dir;
748 whiteout->i_state &= ~I_LINKABLE;
749 iput(whiteout);
750 }
751
752 if (old_dir_entry) {
753 if (old_dir != new_dir && !whiteout) {
754 f2fs_set_link(old_inode, old_dir_entry,
755 old_dir_page, new_dir);
756 update_inode_page(old_inode);
757 } else {
758 f2fs_dentry_kunmap(old_inode, old_dir_page);
759 f2fs_put_page(old_dir_page, 0);
760 }
761 drop_nlink(old_dir);
762 mark_inode_dirty(old_dir);
763 update_inode_page(old_dir);
764 }
765
766 f2fs_unlock_op(sbi);
767
768 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
769 f2fs_sync_fs(sbi->sb, 1);
770 return 0;
771
772 put_out_dir:
773 f2fs_unlock_op(sbi);
774 if (new_page) {
775 f2fs_dentry_kunmap(new_dir, new_page);
776 f2fs_put_page(new_page, 0);
777 }
778 out_whiteout:
779 if (whiteout)
780 iput(whiteout);
781 out_dir:
782 if (old_dir_entry) {
783 f2fs_dentry_kunmap(old_inode, old_dir_page);
784 f2fs_put_page(old_dir_page, 0);
785 }
786 out_old:
787 f2fs_dentry_kunmap(old_dir, old_page);
788 f2fs_put_page(old_page, 0);
789 out:
790 return err;
791 }
792
793 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
794 struct inode *new_dir, struct dentry *new_dentry)
795 {
796 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
797 struct inode *old_inode = d_inode(old_dentry);
798 struct inode *new_inode = d_inode(new_dentry);
799 struct page *old_dir_page, *new_dir_page;
800 struct page *old_page, *new_page;
801 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
802 struct f2fs_dir_entry *old_entry, *new_entry;
803 int old_nlink = 0, new_nlink = 0;
804 int err = -ENOENT;
805
806 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
807 (old_dir != new_dir) &&
808 (!f2fs_is_child_context_consistent_with_parent(new_dir,
809 old_inode) ||
810 !f2fs_is_child_context_consistent_with_parent(old_dir,
811 new_inode)))
812 return -EPERM;
813
814 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
815 if (!old_entry)
816 goto out;
817
818 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
819 if (!new_entry)
820 goto out_old;
821
822 /* prepare for updating ".." directory entry info later */
823 if (old_dir != new_dir) {
824 if (S_ISDIR(old_inode->i_mode)) {
825 err = -EIO;
826 old_dir_entry = f2fs_parent_dir(old_inode,
827 &old_dir_page);
828 if (!old_dir_entry)
829 goto out_new;
830 }
831
832 if (S_ISDIR(new_inode->i_mode)) {
833 err = -EIO;
834 new_dir_entry = f2fs_parent_dir(new_inode,
835 &new_dir_page);
836 if (!new_dir_entry)
837 goto out_old_dir;
838 }
839 }
840
841 /*
842 * If cross rename between file and directory those are not
843 * in the same directory, we will inc nlink of file's parent
844 * later, so we should check upper boundary of its nlink.
845 */
846 if ((!old_dir_entry || !new_dir_entry) &&
847 old_dir_entry != new_dir_entry) {
848 old_nlink = old_dir_entry ? -1 : 1;
849 new_nlink = -old_nlink;
850 err = -EMLINK;
851 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
852 (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
853 goto out_new_dir;
854 }
855
856 f2fs_balance_fs(sbi, true);
857
858 f2fs_lock_op(sbi);
859
860 err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
861 if (err)
862 goto out_unlock;
863 if (file_enc_name(new_inode))
864 file_set_enc_name(old_inode);
865
866 err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
867 if (err)
868 goto out_undo;
869 if (file_enc_name(old_inode))
870 file_set_enc_name(new_inode);
871
872 /* update ".." directory entry info of old dentry */
873 if (old_dir_entry)
874 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
875
876 /* update ".." directory entry info of new dentry */
877 if (new_dir_entry)
878 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
879
880 /* update directory entry info of old dir inode */
881 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
882
883 down_write(&F2FS_I(old_inode)->i_sem);
884 file_lost_pino(old_inode);
885 up_write(&F2FS_I(old_inode)->i_sem);
886
887 update_inode_page(old_inode);
888
889 old_dir->i_ctime = CURRENT_TIME;
890 if (old_nlink) {
891 down_write(&F2FS_I(old_dir)->i_sem);
892 if (old_nlink < 0)
893 drop_nlink(old_dir);
894 else
895 inc_nlink(old_dir);
896 up_write(&F2FS_I(old_dir)->i_sem);
897 }
898 mark_inode_dirty(old_dir);
899 update_inode_page(old_dir);
900
901 /* update directory entry info of new dir inode */
902 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
903
904 down_write(&F2FS_I(new_inode)->i_sem);
905 file_lost_pino(new_inode);
906 up_write(&F2FS_I(new_inode)->i_sem);
907
908 update_inode_page(new_inode);
909
910 new_dir->i_ctime = CURRENT_TIME;
911 if (new_nlink) {
912 down_write(&F2FS_I(new_dir)->i_sem);
913 if (new_nlink < 0)
914 drop_nlink(new_dir);
915 else
916 inc_nlink(new_dir);
917 up_write(&F2FS_I(new_dir)->i_sem);
918 }
919 mark_inode_dirty(new_dir);
920 update_inode_page(new_dir);
921
922 f2fs_unlock_op(sbi);
923
924 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
925 f2fs_sync_fs(sbi->sb, 1);
926 return 0;
927 out_undo:
928 /*
929 * Still we may fail to recover name info of f2fs_inode here
930 * Drop it, once its name is set as encrypted
931 */
932 update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
933 out_unlock:
934 f2fs_unlock_op(sbi);
935 out_new_dir:
936 if (new_dir_entry) {
937 f2fs_dentry_kunmap(new_inode, new_dir_page);
938 f2fs_put_page(new_dir_page, 0);
939 }
940 out_old_dir:
941 if (old_dir_entry) {
942 f2fs_dentry_kunmap(old_inode, old_dir_page);
943 f2fs_put_page(old_dir_page, 0);
944 }
945 out_new:
946 f2fs_dentry_kunmap(new_dir, new_page);
947 f2fs_put_page(new_page, 0);
948 out_old:
949 f2fs_dentry_kunmap(old_dir, old_page);
950 f2fs_put_page(old_page, 0);
951 out:
952 return err;
953 }
954
955 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
956 struct inode *new_dir, struct dentry *new_dentry,
957 unsigned int flags)
958 {
959 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
960 return -EINVAL;
961
962 if (flags & RENAME_EXCHANGE) {
963 return f2fs_cross_rename(old_dir, old_dentry,
964 new_dir, new_dentry);
965 }
966 /*
967 * VFS has already handled the new dentry existence case,
968 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
969 */
970 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
971 }
972
973 #ifdef CONFIG_F2FS_FS_ENCRYPTION
974 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
975 struct inode *inode,
976 struct delayed_call *done)
977 {
978 struct page *cpage = NULL;
979 char *caddr, *paddr = NULL;
980 struct f2fs_str cstr = FSTR_INIT(NULL, 0);
981 struct f2fs_str pstr = FSTR_INIT(NULL, 0);
982 struct f2fs_encrypted_symlink_data *sd;
983 loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
984 u32 max_size = inode->i_sb->s_blocksize;
985 int res;
986
987 if (!dentry)
988 return ERR_PTR(-ECHILD);
989
990 res = f2fs_get_encryption_info(inode);
991 if (res)
992 return ERR_PTR(res);
993
994 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
995 if (IS_ERR(cpage))
996 return ERR_CAST(cpage);
997 caddr = page_address(cpage);
998 caddr[size] = 0;
999
1000 /* Symlink is encrypted */
1001 sd = (struct f2fs_encrypted_symlink_data *)caddr;
1002 cstr.name = sd->encrypted_path;
1003 cstr.len = le16_to_cpu(sd->len);
1004
1005 /* this is broken symlink case */
1006 if (unlikely(cstr.len == 0)) {
1007 res = -ENOENT;
1008 goto errout;
1009 }
1010
1011 /* this is broken symlink case */
1012 if (unlikely(cstr.name[0] == 0)) {
1013 res = -ENOENT;
1014 goto errout;
1015 }
1016
1017 if ((cstr.len + sizeof(struct f2fs_encrypted_symlink_data) - 1) >
1018 max_size) {
1019 /* Symlink data on the disk is corrupted */
1020 res = -EIO;
1021 goto errout;
1022 }
1023 res = f2fs_fname_crypto_alloc_buffer(inode, cstr.len, &pstr);
1024 if (res)
1025 goto errout;
1026
1027 res = f2fs_fname_disk_to_usr(inode, NULL, &cstr, &pstr);
1028 if (res < 0)
1029 goto errout;
1030
1031 paddr = pstr.name;
1032
1033 /* Null-terminate the name */
1034 paddr[res] = '\0';
1035
1036 page_cache_release(cpage);
1037 set_delayed_call(done, kfree_link, paddr);
1038 return paddr;
1039 errout:
1040 f2fs_fname_crypto_free_buffer(&pstr);
1041 page_cache_release(cpage);
1042 return ERR_PTR(res);
1043 }
1044
1045 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1046 .readlink = generic_readlink,
1047 .get_link = f2fs_encrypted_get_link,
1048 .getattr = f2fs_getattr,
1049 .setattr = f2fs_setattr,
1050 #ifdef CONFIG_F2FS_FS_XATTR
1051 .setxattr = generic_setxattr,
1052 .getxattr = generic_getxattr,
1053 .listxattr = f2fs_listxattr,
1054 .removexattr = generic_removexattr,
1055 #endif
1056 };
1057 #endif
1058
1059 const struct inode_operations f2fs_dir_inode_operations = {
1060 .create = f2fs_create,
1061 .lookup = f2fs_lookup,
1062 .link = f2fs_link,
1063 .unlink = f2fs_unlink,
1064 .symlink = f2fs_symlink,
1065 .mkdir = f2fs_mkdir,
1066 .rmdir = f2fs_rmdir,
1067 .mknod = f2fs_mknod,
1068 .rename2 = f2fs_rename2,
1069 .tmpfile = f2fs_tmpfile,
1070 .getattr = f2fs_getattr,
1071 .setattr = f2fs_setattr,
1072 .get_acl = f2fs_get_acl,
1073 .set_acl = f2fs_set_acl,
1074 #ifdef CONFIG_F2FS_FS_XATTR
1075 .setxattr = generic_setxattr,
1076 .getxattr = generic_getxattr,
1077 .listxattr = f2fs_listxattr,
1078 .removexattr = generic_removexattr,
1079 #endif
1080 };
1081
1082 const struct inode_operations f2fs_symlink_inode_operations = {
1083 .readlink = generic_readlink,
1084 .get_link = f2fs_get_link,
1085 .getattr = f2fs_getattr,
1086 .setattr = f2fs_setattr,
1087 #ifdef CONFIG_F2FS_FS_XATTR
1088 .setxattr = generic_setxattr,
1089 .getxattr = generic_getxattr,
1090 .listxattr = f2fs_listxattr,
1091 .removexattr = generic_removexattr,
1092 #endif
1093 };
1094
1095 const struct inode_operations f2fs_special_inode_operations = {
1096 .getattr = f2fs_getattr,
1097 .setattr = f2fs_setattr,
1098 .get_acl = f2fs_get_acl,
1099 .set_acl = f2fs_set_acl,
1100 #ifdef CONFIG_F2FS_FS_XATTR
1101 .setxattr = generic_setxattr,
1102 .getxattr = generic_getxattr,
1103 .listxattr = f2fs_listxattr,
1104 .removexattr = generic_removexattr,
1105 #endif
1106 };
Linux kernel - Deliverables
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