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Merge branch 'pm-tools'
[mirror_ubuntu-artful-kernel.git] / fs / f2fs / namei.c
1 /*
2 * fs/f2fs/namei.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11 #include <linux/fs.h>
12 #include <linux/f2fs_fs.h>
13 #include <linux/pagemap.h>
14 #include <linux/sched.h>
15 #include <linux/ctype.h>
16 #include <linux/dcache.h>
17 #include <linux/namei.h>
18
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 (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 f2fs_balance_fs(sbi);
132
133 inode = f2fs_new_inode(dir, mode);
134 if (IS_ERR(inode))
135 return PTR_ERR(inode);
136
137 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
138 set_cold_files(sbi, inode, dentry->d_name.name);
139
140 inode->i_op = &f2fs_file_inode_operations;
141 inode->i_fop = &f2fs_file_operations;
142 inode->i_mapping->a_ops = &f2fs_dblock_aops;
143 ino = inode->i_ino;
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);
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 f2fs_lock_op(sbi);
218
219 de = f2fs_find_entry(dir, &dot, &page);
220 if (de) {
221 f2fs_dentry_kunmap(dir, page);
222 f2fs_put_page(page, 0);
223 } else {
224 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
225 if (err)
226 goto out;
227 }
228
229 de = f2fs_find_entry(dir, &dotdot, &page);
230 if (de) {
231 f2fs_dentry_kunmap(dir, page);
232 f2fs_put_page(page, 0);
233 } else {
234 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
235 }
236 out:
237 if (!err) {
238 clear_inode_flag(F2FS_I(dir), FI_INLINE_DOTS);
239 mark_inode_dirty(dir);
240 }
241
242 f2fs_unlock_op(sbi);
243 return err;
244 }
245
246 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
247 unsigned int flags)
248 {
249 struct inode *inode = NULL;
250 struct f2fs_dir_entry *de;
251 struct page *page;
252 nid_t ino;
253 int err = 0;
254
255 if (dentry->d_name.len > F2FS_NAME_LEN)
256 return ERR_PTR(-ENAMETOOLONG);
257
258 de = f2fs_find_entry(dir, &dentry->d_name, &page);
259 if (!de)
260 return d_splice_alias(inode, dentry);
261
262 ino = le32_to_cpu(de->ino);
263 f2fs_dentry_kunmap(dir, page);
264 f2fs_put_page(page, 0);
265
266 inode = f2fs_iget(dir->i_sb, ino);
267 if (IS_ERR(inode))
268 return ERR_CAST(inode);
269
270 if (f2fs_has_inline_dots(inode)) {
271 err = __recover_dot_dentries(inode, dir->i_ino);
272 if (err)
273 goto err_out;
274 }
275 return d_splice_alias(inode, dentry);
276
277 err_out:
278 iget_failed(inode);
279 return ERR_PTR(err);
280 }
281
282 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
283 {
284 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
285 struct inode *inode = d_inode(dentry);
286 struct f2fs_dir_entry *de;
287 struct page *page;
288 int err = -ENOENT;
289
290 trace_f2fs_unlink_enter(dir, dentry);
291 f2fs_balance_fs(sbi);
292
293 de = f2fs_find_entry(dir, &dentry->d_name, &page);
294 if (!de)
295 goto fail;
296
297 f2fs_lock_op(sbi);
298 err = acquire_orphan_inode(sbi);
299 if (err) {
300 f2fs_unlock_op(sbi);
301 f2fs_dentry_kunmap(dir, page);
302 f2fs_put_page(page, 0);
303 goto fail;
304 }
305 f2fs_delete_entry(de, page, dir, inode);
306 f2fs_unlock_op(sbi);
307
308 /* In order to evict this inode, we set it dirty */
309 mark_inode_dirty(inode);
310
311 if (IS_DIRSYNC(dir))
312 f2fs_sync_fs(sbi->sb, 1);
313 fail:
314 trace_f2fs_unlink_exit(inode, err);
315 return err;
316 }
317
318 static const char *f2fs_follow_link(struct dentry *dentry, void **cookie)
319 {
320 const char *link = page_follow_link_light(dentry, cookie);
321 if (!IS_ERR(link) && !*link) {
322 /* this is broken symlink case */
323 page_put_link(NULL, *cookie);
324 link = ERR_PTR(-ENOENT);
325 }
326 return link;
327 }
328
329 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
330 const char *symname)
331 {
332 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
333 struct inode *inode;
334 size_t len = strlen(symname);
335 size_t p_len;
336 char *p_str;
337 struct f2fs_str disk_link = FSTR_INIT(NULL, 0);
338 struct f2fs_encrypted_symlink_data *sd = NULL;
339 int err;
340
341 if (len > dir->i_sb->s_blocksize)
342 return -ENAMETOOLONG;
343
344 f2fs_balance_fs(sbi);
345
346 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
347 if (IS_ERR(inode))
348 return PTR_ERR(inode);
349
350 if (f2fs_encrypted_inode(inode))
351 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
352 else
353 inode->i_op = &f2fs_symlink_inode_operations;
354 inode->i_mapping->a_ops = &f2fs_dblock_aops;
355
356 f2fs_lock_op(sbi);
357 err = f2fs_add_link(dentry, inode);
358 if (err)
359 goto out;
360 f2fs_unlock_op(sbi);
361 alloc_nid_done(sbi, inode->i_ino);
362
363 if (f2fs_encrypted_inode(dir)) {
364 struct qstr istr = QSTR_INIT(symname, len);
365
366 err = f2fs_get_encryption_info(inode);
367 if (err)
368 goto err_out;
369
370 err = f2fs_fname_crypto_alloc_buffer(inode, len, &disk_link);
371 if (err)
372 goto err_out;
373
374 err = f2fs_fname_usr_to_disk(inode, &istr, &disk_link);
375 if (err < 0)
376 goto err_out;
377
378 p_len = encrypted_symlink_data_len(disk_link.len) + 1;
379
380 if (p_len > dir->i_sb->s_blocksize) {
381 err = -ENAMETOOLONG;
382 goto err_out;
383 }
384
385 sd = kzalloc(p_len, GFP_NOFS);
386 if (!sd) {
387 err = -ENOMEM;
388 goto err_out;
389 }
390 memcpy(sd->encrypted_path, disk_link.name, disk_link.len);
391 sd->len = cpu_to_le16(disk_link.len);
392 p_str = (char *)sd;
393 } else {
394 p_len = len + 1;
395 p_str = (char *)symname;
396 }
397
398 err = page_symlink(inode, p_str, p_len);
399
400 err_out:
401 d_instantiate(dentry, inode);
402 unlock_new_inode(inode);
403
404 /*
405 * Let's flush symlink data in order to avoid broken symlink as much as
406 * possible. Nevertheless, fsyncing is the best way, but there is no
407 * way to get a file descriptor in order to flush that.
408 *
409 * Note that, it needs to do dir->fsync to make this recoverable.
410 * If the symlink path is stored into inline_data, there is no
411 * performance regression.
412 */
413 if (!err) {
414 filemap_write_and_wait_range(inode->i_mapping, 0, p_len - 1);
415
416 if (IS_DIRSYNC(dir))
417 f2fs_sync_fs(sbi->sb, 1);
418 } else {
419 f2fs_unlink(dir, dentry);
420 }
421
422 kfree(sd);
423 f2fs_fname_crypto_free_buffer(&disk_link);
424 return err;
425 out:
426 handle_failed_inode(inode);
427 return err;
428 }
429
430 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
431 {
432 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
433 struct inode *inode;
434 int err;
435
436 f2fs_balance_fs(sbi);
437
438 inode = f2fs_new_inode(dir, S_IFDIR | mode);
439 if (IS_ERR(inode))
440 return PTR_ERR(inode);
441
442 inode->i_op = &f2fs_dir_inode_operations;
443 inode->i_fop = &f2fs_dir_operations;
444 inode->i_mapping->a_ops = &f2fs_dblock_aops;
445 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
446
447 set_inode_flag(F2FS_I(inode), FI_INC_LINK);
448 f2fs_lock_op(sbi);
449 err = f2fs_add_link(dentry, inode);
450 if (err)
451 goto out_fail;
452 f2fs_unlock_op(sbi);
453
454 alloc_nid_done(sbi, inode->i_ino);
455
456 d_instantiate(dentry, inode);
457 unlock_new_inode(inode);
458
459 if (IS_DIRSYNC(dir))
460 f2fs_sync_fs(sbi->sb, 1);
461 return 0;
462
463 out_fail:
464 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
465 handle_failed_inode(inode);
466 return err;
467 }
468
469 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
470 {
471 struct inode *inode = d_inode(dentry);
472 if (f2fs_empty_dir(inode))
473 return f2fs_unlink(dir, dentry);
474 return -ENOTEMPTY;
475 }
476
477 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
478 umode_t mode, dev_t rdev)
479 {
480 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
481 struct inode *inode;
482 int err = 0;
483
484 f2fs_balance_fs(sbi);
485
486 inode = f2fs_new_inode(dir, mode);
487 if (IS_ERR(inode))
488 return PTR_ERR(inode);
489
490 init_special_inode(inode, inode->i_mode, rdev);
491 inode->i_op = &f2fs_special_inode_operations;
492
493 f2fs_lock_op(sbi);
494 err = f2fs_add_link(dentry, inode);
495 if (err)
496 goto out;
497 f2fs_unlock_op(sbi);
498
499 alloc_nid_done(sbi, inode->i_ino);
500
501 d_instantiate(dentry, inode);
502 unlock_new_inode(inode);
503
504 if (IS_DIRSYNC(dir))
505 f2fs_sync_fs(sbi->sb, 1);
506 return 0;
507 out:
508 handle_failed_inode(inode);
509 return err;
510 }
511
512 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
513 umode_t mode, struct inode **whiteout)
514 {
515 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
516 struct inode *inode;
517 int err;
518
519 if (!whiteout)
520 f2fs_balance_fs(sbi);
521
522 inode = f2fs_new_inode(dir, mode);
523 if (IS_ERR(inode))
524 return PTR_ERR(inode);
525
526 if (whiteout) {
527 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
528 inode->i_op = &f2fs_special_inode_operations;
529 } else {
530 inode->i_op = &f2fs_file_inode_operations;
531 inode->i_fop = &f2fs_file_operations;
532 inode->i_mapping->a_ops = &f2fs_dblock_aops;
533 }
534
535 f2fs_lock_op(sbi);
536 err = acquire_orphan_inode(sbi);
537 if (err)
538 goto out;
539
540 err = f2fs_do_tmpfile(inode, dir);
541 if (err)
542 goto release_out;
543
544 /*
545 * add this non-linked tmpfile to orphan list, in this way we could
546 * remove all unused data of tmpfile after abnormal power-off.
547 */
548 add_orphan_inode(sbi, inode->i_ino);
549 f2fs_unlock_op(sbi);
550
551 alloc_nid_done(sbi, inode->i_ino);
552
553 if (whiteout) {
554 inode_dec_link_count(inode);
555 *whiteout = inode;
556 } else {
557 d_tmpfile(dentry, inode);
558 }
559 unlock_new_inode(inode);
560 return 0;
561
562 release_out:
563 release_orphan_inode(sbi);
564 out:
565 handle_failed_inode(inode);
566 return err;
567 }
568
569 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
570 {
571 if (f2fs_encrypted_inode(dir)) {
572 int err = f2fs_get_encryption_info(dir);
573 if (err)
574 return err;
575 }
576
577 return __f2fs_tmpfile(dir, dentry, mode, NULL);
578 }
579
580 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
581 {
582 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
583 }
584
585 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
586 struct inode *new_dir, struct dentry *new_dentry,
587 unsigned int flags)
588 {
589 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
590 struct inode *old_inode = d_inode(old_dentry);
591 struct inode *new_inode = d_inode(new_dentry);
592 struct inode *whiteout = NULL;
593 struct page *old_dir_page;
594 struct page *old_page, *new_page = NULL;
595 struct f2fs_dir_entry *old_dir_entry = NULL;
596 struct f2fs_dir_entry *old_entry;
597 struct f2fs_dir_entry *new_entry;
598 int err = -ENOENT;
599
600 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
601 !f2fs_is_child_context_consistent_with_parent(new_dir,
602 old_inode)) {
603 err = -EPERM;
604 goto out;
605 }
606
607 f2fs_balance_fs(sbi);
608
609 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
610 if (!old_entry)
611 goto out;
612
613 if (S_ISDIR(old_inode->i_mode)) {
614 err = -EIO;
615 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
616 if (!old_dir_entry)
617 goto out_old;
618 }
619
620 if (flags & RENAME_WHITEOUT) {
621 err = f2fs_create_whiteout(old_dir, &whiteout);
622 if (err)
623 goto out_dir;
624 }
625
626 if (new_inode) {
627
628 err = -ENOTEMPTY;
629 if (old_dir_entry && !f2fs_empty_dir(new_inode))
630 goto out_whiteout;
631
632 err = -ENOENT;
633 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
634 &new_page);
635 if (!new_entry)
636 goto out_whiteout;
637
638 f2fs_lock_op(sbi);
639
640 err = acquire_orphan_inode(sbi);
641 if (err)
642 goto put_out_dir;
643
644 if (update_dent_inode(old_inode, new_inode,
645 &new_dentry->d_name)) {
646 release_orphan_inode(sbi);
647 goto put_out_dir;
648 }
649
650 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
651
652 new_inode->i_ctime = CURRENT_TIME;
653 down_write(&F2FS_I(new_inode)->i_sem);
654 if (old_dir_entry)
655 drop_nlink(new_inode);
656 drop_nlink(new_inode);
657 up_write(&F2FS_I(new_inode)->i_sem);
658
659 mark_inode_dirty(new_inode);
660
661 if (!new_inode->i_nlink)
662 add_orphan_inode(sbi, new_inode->i_ino);
663 else
664 release_orphan_inode(sbi);
665
666 update_inode_page(old_inode);
667 update_inode_page(new_inode);
668 } else {
669 f2fs_lock_op(sbi);
670
671 err = f2fs_add_link(new_dentry, old_inode);
672 if (err) {
673 f2fs_unlock_op(sbi);
674 goto out_whiteout;
675 }
676
677 if (old_dir_entry) {
678 inc_nlink(new_dir);
679 update_inode_page(new_dir);
680 }
681 }
682
683 down_write(&F2FS_I(old_inode)->i_sem);
684 file_lost_pino(old_inode);
685 if (new_inode && file_enc_name(new_inode))
686 file_set_enc_name(old_inode);
687 up_write(&F2FS_I(old_inode)->i_sem);
688
689 old_inode->i_ctime = CURRENT_TIME;
690 mark_inode_dirty(old_inode);
691
692 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
693
694 if (whiteout) {
695 whiteout->i_state |= I_LINKABLE;
696 set_inode_flag(F2FS_I(whiteout), FI_INC_LINK);
697 err = f2fs_add_link(old_dentry, whiteout);
698 if (err)
699 goto put_out_dir;
700 whiteout->i_state &= ~I_LINKABLE;
701 iput(whiteout);
702 }
703
704 if (old_dir_entry) {
705 if (old_dir != new_dir && !whiteout) {
706 f2fs_set_link(old_inode, old_dir_entry,
707 old_dir_page, new_dir);
708 update_inode_page(old_inode);
709 } else {
710 f2fs_dentry_kunmap(old_inode, old_dir_page);
711 f2fs_put_page(old_dir_page, 0);
712 }
713 drop_nlink(old_dir);
714 mark_inode_dirty(old_dir);
715 update_inode_page(old_dir);
716 }
717
718 f2fs_unlock_op(sbi);
719
720 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
721 f2fs_sync_fs(sbi->sb, 1);
722 return 0;
723
724 put_out_dir:
725 f2fs_unlock_op(sbi);
726 if (new_page) {
727 f2fs_dentry_kunmap(new_dir, new_page);
728 f2fs_put_page(new_page, 0);
729 }
730 out_whiteout:
731 if (whiteout)
732 iput(whiteout);
733 out_dir:
734 if (old_dir_entry) {
735 f2fs_dentry_kunmap(old_inode, old_dir_page);
736 f2fs_put_page(old_dir_page, 0);
737 }
738 out_old:
739 f2fs_dentry_kunmap(old_dir, old_page);
740 f2fs_put_page(old_page, 0);
741 out:
742 return err;
743 }
744
745 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
746 struct inode *new_dir, struct dentry *new_dentry)
747 {
748 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
749 struct inode *old_inode = d_inode(old_dentry);
750 struct inode *new_inode = d_inode(new_dentry);
751 struct page *old_dir_page, *new_dir_page;
752 struct page *old_page, *new_page;
753 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
754 struct f2fs_dir_entry *old_entry, *new_entry;
755 int old_nlink = 0, new_nlink = 0;
756 int err = -ENOENT;
757
758 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
759 (old_dir != new_dir) &&
760 (!f2fs_is_child_context_consistent_with_parent(new_dir,
761 old_inode) ||
762 !f2fs_is_child_context_consistent_with_parent(old_dir,
763 new_inode)))
764 return -EPERM;
765
766 f2fs_balance_fs(sbi);
767
768 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
769 if (!old_entry)
770 goto out;
771
772 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
773 if (!new_entry)
774 goto out_old;
775
776 /* prepare for updating ".." directory entry info later */
777 if (old_dir != new_dir) {
778 if (S_ISDIR(old_inode->i_mode)) {
779 err = -EIO;
780 old_dir_entry = f2fs_parent_dir(old_inode,
781 &old_dir_page);
782 if (!old_dir_entry)
783 goto out_new;
784 }
785
786 if (S_ISDIR(new_inode->i_mode)) {
787 err = -EIO;
788 new_dir_entry = f2fs_parent_dir(new_inode,
789 &new_dir_page);
790 if (!new_dir_entry)
791 goto out_old_dir;
792 }
793 }
794
795 /*
796 * If cross rename between file and directory those are not
797 * in the same directory, we will inc nlink of file's parent
798 * later, so we should check upper boundary of its nlink.
799 */
800 if ((!old_dir_entry || !new_dir_entry) &&
801 old_dir_entry != new_dir_entry) {
802 old_nlink = old_dir_entry ? -1 : 1;
803 new_nlink = -old_nlink;
804 err = -EMLINK;
805 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
806 (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
807 goto out_new_dir;
808 }
809
810 f2fs_lock_op(sbi);
811
812 err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
813 if (err)
814 goto out_unlock;
815 if (file_enc_name(new_inode))
816 file_set_enc_name(old_inode);
817
818 err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
819 if (err)
820 goto out_undo;
821 if (file_enc_name(old_inode))
822 file_set_enc_name(new_inode);
823
824 /* update ".." directory entry info of old dentry */
825 if (old_dir_entry)
826 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
827
828 /* update ".." directory entry info of new dentry */
829 if (new_dir_entry)
830 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
831
832 /* update directory entry info of old dir inode */
833 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
834
835 down_write(&F2FS_I(old_inode)->i_sem);
836 file_lost_pino(old_inode);
837 up_write(&F2FS_I(old_inode)->i_sem);
838
839 update_inode_page(old_inode);
840
841 old_dir->i_ctime = CURRENT_TIME;
842 if (old_nlink) {
843 down_write(&F2FS_I(old_dir)->i_sem);
844 if (old_nlink < 0)
845 drop_nlink(old_dir);
846 else
847 inc_nlink(old_dir);
848 up_write(&F2FS_I(old_dir)->i_sem);
849 }
850 mark_inode_dirty(old_dir);
851 update_inode_page(old_dir);
852
853 /* update directory entry info of new dir inode */
854 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
855
856 down_write(&F2FS_I(new_inode)->i_sem);
857 file_lost_pino(new_inode);
858 up_write(&F2FS_I(new_inode)->i_sem);
859
860 update_inode_page(new_inode);
861
862 new_dir->i_ctime = CURRENT_TIME;
863 if (new_nlink) {
864 down_write(&F2FS_I(new_dir)->i_sem);
865 if (new_nlink < 0)
866 drop_nlink(new_dir);
867 else
868 inc_nlink(new_dir);
869 up_write(&F2FS_I(new_dir)->i_sem);
870 }
871 mark_inode_dirty(new_dir);
872 update_inode_page(new_dir);
873
874 f2fs_unlock_op(sbi);
875
876 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
877 f2fs_sync_fs(sbi->sb, 1);
878 return 0;
879 out_undo:
880 /*
881 * Still we may fail to recover name info of f2fs_inode here
882 * Drop it, once its name is set as encrypted
883 */
884 update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
885 out_unlock:
886 f2fs_unlock_op(sbi);
887 out_new_dir:
888 if (new_dir_entry) {
889 f2fs_dentry_kunmap(new_inode, new_dir_page);
890 f2fs_put_page(new_dir_page, 0);
891 }
892 out_old_dir:
893 if (old_dir_entry) {
894 f2fs_dentry_kunmap(old_inode, old_dir_page);
895 f2fs_put_page(old_dir_page, 0);
896 }
897 out_new:
898 f2fs_dentry_kunmap(new_dir, new_page);
899 f2fs_put_page(new_page, 0);
900 out_old:
901 f2fs_dentry_kunmap(old_dir, old_page);
902 f2fs_put_page(old_page, 0);
903 out:
904 return err;
905 }
906
907 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
908 struct inode *new_dir, struct dentry *new_dentry,
909 unsigned int flags)
910 {
911 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
912 return -EINVAL;
913
914 if (flags & RENAME_EXCHANGE) {
915 return f2fs_cross_rename(old_dir, old_dentry,
916 new_dir, new_dentry);
917 }
918 /*
919 * VFS has already handled the new dentry existence case,
920 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
921 */
922 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
923 }
924
925 #ifdef CONFIG_F2FS_FS_ENCRYPTION
926 static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
927 {
928 struct page *cpage = NULL;
929 char *caddr, *paddr = NULL;
930 struct f2fs_str cstr;
931 struct f2fs_str pstr = FSTR_INIT(NULL, 0);
932 struct inode *inode = d_inode(dentry);
933 struct f2fs_encrypted_symlink_data *sd;
934 loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
935 u32 max_size = inode->i_sb->s_blocksize;
936 int res;
937
938 res = f2fs_get_encryption_info(inode);
939 if (res)
940 return ERR_PTR(res);
941
942 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
943 if (IS_ERR(cpage))
944 return ERR_CAST(cpage);
945 caddr = kmap(cpage);
946 caddr[size] = 0;
947
948 /* Symlink is encrypted */
949 sd = (struct f2fs_encrypted_symlink_data *)caddr;
950 cstr.len = le16_to_cpu(sd->len);
951 cstr.name = kmalloc(cstr.len, GFP_NOFS);
952 if (!cstr.name) {
953 res = -ENOMEM;
954 goto errout;
955 }
956 memcpy(cstr.name, sd->encrypted_path, cstr.len);
957
958 /* this is broken symlink case */
959 if (cstr.name[0] == 0 && cstr.len == 0) {
960 res = -ENOENT;
961 goto errout;
962 }
963
964 if ((cstr.len + sizeof(struct f2fs_encrypted_symlink_data) - 1) >
965 max_size) {
966 /* Symlink data on the disk is corrupted */
967 res = -EIO;
968 goto errout;
969 }
970 res = f2fs_fname_crypto_alloc_buffer(inode, cstr.len, &pstr);
971 if (res)
972 goto errout;
973
974 res = f2fs_fname_disk_to_usr(inode, NULL, &cstr, &pstr);
975 if (res < 0)
976 goto errout;
977
978 kfree(cstr.name);
979
980 paddr = pstr.name;
981
982 /* Null-terminate the name */
983 paddr[res] = '\0';
984
985 kunmap(cpage);
986 page_cache_release(cpage);
987 return *cookie = paddr;
988 errout:
989 kfree(cstr.name);
990 f2fs_fname_crypto_free_buffer(&pstr);
991 kunmap(cpage);
992 page_cache_release(cpage);
993 return ERR_PTR(res);
994 }
995
996 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
997 .readlink = generic_readlink,
998 .follow_link = f2fs_encrypted_follow_link,
999 .put_link = kfree_put_link,
1000 .getattr = f2fs_getattr,
1001 .setattr = f2fs_setattr,
1002 .setxattr = generic_setxattr,
1003 .getxattr = generic_getxattr,
1004 .listxattr = f2fs_listxattr,
1005 .removexattr = generic_removexattr,
1006 };
1007 #endif
1008
1009 const struct inode_operations f2fs_dir_inode_operations = {
1010 .create = f2fs_create,
1011 .lookup = f2fs_lookup,
1012 .link = f2fs_link,
1013 .unlink = f2fs_unlink,
1014 .symlink = f2fs_symlink,
1015 .mkdir = f2fs_mkdir,
1016 .rmdir = f2fs_rmdir,
1017 .mknod = f2fs_mknod,
1018 .rename2 = f2fs_rename2,
1019 .tmpfile = f2fs_tmpfile,
1020 .getattr = f2fs_getattr,
1021 .setattr = f2fs_setattr,
1022 .get_acl = f2fs_get_acl,
1023 .set_acl = f2fs_set_acl,
1024 #ifdef CONFIG_F2FS_FS_XATTR
1025 .setxattr = generic_setxattr,
1026 .getxattr = generic_getxattr,
1027 .listxattr = f2fs_listxattr,
1028 .removexattr = generic_removexattr,
1029 #endif
1030 };
1031
1032 const struct inode_operations f2fs_symlink_inode_operations = {
1033 .readlink = generic_readlink,
1034 .follow_link = f2fs_follow_link,
1035 .put_link = page_put_link,
1036 .getattr = f2fs_getattr,
1037 .setattr = f2fs_setattr,
1038 #ifdef CONFIG_F2FS_FS_XATTR
1039 .setxattr = generic_setxattr,
1040 .getxattr = generic_getxattr,
1041 .listxattr = f2fs_listxattr,
1042 .removexattr = generic_removexattr,
1043 #endif
1044 };
1045
1046 const struct inode_operations f2fs_special_inode_operations = {
1047 .getattr = f2fs_getattr,
1048 .setattr = f2fs_setattr,
1049 .get_acl = f2fs_get_acl,
1050 .set_acl = f2fs_set_acl,
1051 #ifdef CONFIG_F2FS_FS_XATTR
1052 .setxattr = generic_setxattr,
1053 .getxattr = generic_getxattr,
1054 .listxattr = f2fs_listxattr,
1055 .removexattr = generic_removexattr,
1056 #endif
1057 };
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