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Merge tag 'armsoc-defconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/arm...
[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
264 if (dentry->d_name.len > F2FS_NAME_LEN)
265 return ERR_PTR(-ENAMETOOLONG);
266
267 de = f2fs_find_entry(dir, &dentry->d_name, &page);
268 if (!de)
269 return d_splice_alias(inode, dentry);
270
271 ino = le32_to_cpu(de->ino);
272 f2fs_dentry_kunmap(dir, page);
273 f2fs_put_page(page, 0);
274
275 inode = f2fs_iget(dir->i_sb, ino);
276 if (IS_ERR(inode))
277 return ERR_CAST(inode);
278
279 if (f2fs_has_inline_dots(inode)) {
280 err = __recover_dot_dentries(inode, dir->i_ino);
281 if (err)
282 goto err_out;
283 }
284 return d_splice_alias(inode, dentry);
285
286 err_out:
287 iget_failed(inode);
288 return ERR_PTR(err);
289 }
290
291 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
292 {
293 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
294 struct inode *inode = d_inode(dentry);
295 struct f2fs_dir_entry *de;
296 struct page *page;
297 int err = -ENOENT;
298
299 trace_f2fs_unlink_enter(dir, dentry);
300
301 de = f2fs_find_entry(dir, &dentry->d_name, &page);
302 if (!de)
303 goto fail;
304
305 f2fs_balance_fs(sbi, true);
306
307 f2fs_lock_op(sbi);
308 err = acquire_orphan_inode(sbi);
309 if (err) {
310 f2fs_unlock_op(sbi);
311 f2fs_dentry_kunmap(dir, page);
312 f2fs_put_page(page, 0);
313 goto fail;
314 }
315 f2fs_delete_entry(de, page, dir, inode);
316 f2fs_unlock_op(sbi);
317
318 /* In order to evict this inode, we set it dirty */
319 mark_inode_dirty(inode);
320
321 if (IS_DIRSYNC(dir))
322 f2fs_sync_fs(sbi->sb, 1);
323 fail:
324 trace_f2fs_unlink_exit(inode, err);
325 return err;
326 }
327
328 static const char *f2fs_get_link(struct dentry *dentry,
329 struct inode *inode,
330 struct delayed_call *done)
331 {
332 const char *link = page_get_link(dentry, inode, done);
333 if (!IS_ERR(link) && !*link) {
334 /* this is broken symlink case */
335 do_delayed_call(done);
336 clear_delayed_call(done);
337 link = ERR_PTR(-ENOENT);
338 }
339 return link;
340 }
341
342 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
343 const char *symname)
344 {
345 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
346 struct inode *inode;
347 size_t len = strlen(symname);
348 size_t p_len;
349 char *p_str;
350 struct f2fs_str disk_link = FSTR_INIT(NULL, 0);
351 struct f2fs_encrypted_symlink_data *sd = NULL;
352 int err;
353
354 if (len > dir->i_sb->s_blocksize)
355 return -ENAMETOOLONG;
356
357 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
358 if (IS_ERR(inode))
359 return PTR_ERR(inode);
360
361 if (f2fs_encrypted_inode(inode))
362 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
363 else
364 inode->i_op = &f2fs_symlink_inode_operations;
365 inode_nohighmem(inode);
366 inode->i_mapping->a_ops = &f2fs_dblock_aops;
367
368 f2fs_balance_fs(sbi, true);
369
370 f2fs_lock_op(sbi);
371 err = f2fs_add_link(dentry, inode);
372 if (err)
373 goto out;
374 f2fs_unlock_op(sbi);
375 alloc_nid_done(sbi, inode->i_ino);
376
377 if (f2fs_encrypted_inode(dir)) {
378 struct qstr istr = QSTR_INIT(symname, len);
379
380 err = f2fs_get_encryption_info(inode);
381 if (err)
382 goto err_out;
383
384 err = f2fs_fname_crypto_alloc_buffer(inode, len, &disk_link);
385 if (err)
386 goto err_out;
387
388 err = f2fs_fname_usr_to_disk(inode, &istr, &disk_link);
389 if (err < 0)
390 goto err_out;
391
392 p_len = encrypted_symlink_data_len(disk_link.len) + 1;
393
394 if (p_len > dir->i_sb->s_blocksize) {
395 err = -ENAMETOOLONG;
396 goto err_out;
397 }
398
399 sd = kzalloc(p_len, GFP_NOFS);
400 if (!sd) {
401 err = -ENOMEM;
402 goto err_out;
403 }
404 memcpy(sd->encrypted_path, disk_link.name, disk_link.len);
405 sd->len = cpu_to_le16(disk_link.len);
406 p_str = (char *)sd;
407 } else {
408 p_len = len + 1;
409 p_str = (char *)symname;
410 }
411
412 err = page_symlink(inode, p_str, p_len);
413
414 err_out:
415 d_instantiate(dentry, inode);
416 unlock_new_inode(inode);
417
418 /*
419 * Let's flush symlink data in order to avoid broken symlink as much as
420 * possible. Nevertheless, fsyncing is the best way, but there is no
421 * way to get a file descriptor in order to flush that.
422 *
423 * Note that, it needs to do dir->fsync to make this recoverable.
424 * If the symlink path is stored into inline_data, there is no
425 * performance regression.
426 */
427 if (!err) {
428 filemap_write_and_wait_range(inode->i_mapping, 0, p_len - 1);
429
430 if (IS_DIRSYNC(dir))
431 f2fs_sync_fs(sbi->sb, 1);
432 } else {
433 f2fs_unlink(dir, dentry);
434 }
435
436 kfree(sd);
437 f2fs_fname_crypto_free_buffer(&disk_link);
438 return err;
439 out:
440 handle_failed_inode(inode);
441 return err;
442 }
443
444 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
445 {
446 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
447 struct inode *inode;
448 int err;
449
450 inode = f2fs_new_inode(dir, S_IFDIR | mode);
451 if (IS_ERR(inode))
452 return PTR_ERR(inode);
453
454 inode->i_op = &f2fs_dir_inode_operations;
455 inode->i_fop = &f2fs_dir_operations;
456 inode->i_mapping->a_ops = &f2fs_dblock_aops;
457 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
458
459 f2fs_balance_fs(sbi, true);
460
461 set_inode_flag(F2FS_I(inode), FI_INC_LINK);
462 f2fs_lock_op(sbi);
463 err = f2fs_add_link(dentry, inode);
464 if (err)
465 goto out_fail;
466 f2fs_unlock_op(sbi);
467
468 alloc_nid_done(sbi, inode->i_ino);
469
470 d_instantiate(dentry, inode);
471 unlock_new_inode(inode);
472
473 if (IS_DIRSYNC(dir))
474 f2fs_sync_fs(sbi->sb, 1);
475 return 0;
476
477 out_fail:
478 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
479 handle_failed_inode(inode);
480 return err;
481 }
482
483 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
484 {
485 struct inode *inode = d_inode(dentry);
486 if (f2fs_empty_dir(inode))
487 return f2fs_unlink(dir, dentry);
488 return -ENOTEMPTY;
489 }
490
491 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
492 umode_t mode, dev_t rdev)
493 {
494 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
495 struct inode *inode;
496 int err = 0;
497
498 inode = f2fs_new_inode(dir, mode);
499 if (IS_ERR(inode))
500 return PTR_ERR(inode);
501
502 init_special_inode(inode, inode->i_mode, rdev);
503 inode->i_op = &f2fs_special_inode_operations;
504
505 f2fs_balance_fs(sbi, true);
506
507 f2fs_lock_op(sbi);
508 err = f2fs_add_link(dentry, inode);
509 if (err)
510 goto out;
511 f2fs_unlock_op(sbi);
512
513 alloc_nid_done(sbi, inode->i_ino);
514
515 d_instantiate(dentry, inode);
516 unlock_new_inode(inode);
517
518 if (IS_DIRSYNC(dir))
519 f2fs_sync_fs(sbi->sb, 1);
520 return 0;
521 out:
522 handle_failed_inode(inode);
523 return err;
524 }
525
526 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
527 umode_t mode, struct inode **whiteout)
528 {
529 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
530 struct inode *inode;
531 int err;
532
533 inode = f2fs_new_inode(dir, mode);
534 if (IS_ERR(inode))
535 return PTR_ERR(inode);
536
537 if (whiteout) {
538 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
539 inode->i_op = &f2fs_special_inode_operations;
540 } else {
541 inode->i_op = &f2fs_file_inode_operations;
542 inode->i_fop = &f2fs_file_operations;
543 inode->i_mapping->a_ops = &f2fs_dblock_aops;
544 }
545
546 f2fs_balance_fs(sbi, true);
547
548 f2fs_lock_op(sbi);
549 err = acquire_orphan_inode(sbi);
550 if (err)
551 goto out;
552
553 err = f2fs_do_tmpfile(inode, dir);
554 if (err)
555 goto release_out;
556
557 /*
558 * add this non-linked tmpfile to orphan list, in this way we could
559 * remove all unused data of tmpfile after abnormal power-off.
560 */
561 add_orphan_inode(sbi, inode->i_ino);
562 f2fs_unlock_op(sbi);
563
564 alloc_nid_done(sbi, inode->i_ino);
565
566 if (whiteout) {
567 inode_dec_link_count(inode);
568 *whiteout = inode;
569 } else {
570 d_tmpfile(dentry, inode);
571 }
572 unlock_new_inode(inode);
573 return 0;
574
575 release_out:
576 release_orphan_inode(sbi);
577 out:
578 handle_failed_inode(inode);
579 return err;
580 }
581
582 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
583 {
584 if (f2fs_encrypted_inode(dir)) {
585 int err = f2fs_get_encryption_info(dir);
586 if (err)
587 return err;
588 }
589
590 return __f2fs_tmpfile(dir, dentry, mode, NULL);
591 }
592
593 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
594 {
595 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
596 }
597
598 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
599 struct inode *new_dir, struct dentry *new_dentry,
600 unsigned int flags)
601 {
602 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
603 struct inode *old_inode = d_inode(old_dentry);
604 struct inode *new_inode = d_inode(new_dentry);
605 struct inode *whiteout = NULL;
606 struct page *old_dir_page;
607 struct page *old_page, *new_page = NULL;
608 struct f2fs_dir_entry *old_dir_entry = NULL;
609 struct f2fs_dir_entry *old_entry;
610 struct f2fs_dir_entry *new_entry;
611 int err = -ENOENT;
612
613 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
614 !f2fs_is_child_context_consistent_with_parent(new_dir,
615 old_inode)) {
616 err = -EPERM;
617 goto out;
618 }
619
620 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
621 if (!old_entry)
622 goto out;
623
624 if (S_ISDIR(old_inode->i_mode)) {
625 err = -EIO;
626 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
627 if (!old_dir_entry)
628 goto out_old;
629 }
630
631 if (flags & RENAME_WHITEOUT) {
632 err = f2fs_create_whiteout(old_dir, &whiteout);
633 if (err)
634 goto out_dir;
635 }
636
637 if (new_inode) {
638
639 err = -ENOTEMPTY;
640 if (old_dir_entry && !f2fs_empty_dir(new_inode))
641 goto out_whiteout;
642
643 err = -ENOENT;
644 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
645 &new_page);
646 if (!new_entry)
647 goto out_whiteout;
648
649 f2fs_balance_fs(sbi, true);
650
651 f2fs_lock_op(sbi);
652
653 err = acquire_orphan_inode(sbi);
654 if (err)
655 goto put_out_dir;
656
657 if (update_dent_inode(old_inode, new_inode,
658 &new_dentry->d_name)) {
659 release_orphan_inode(sbi);
660 goto put_out_dir;
661 }
662
663 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
664
665 new_inode->i_ctime = CURRENT_TIME;
666 down_write(&F2FS_I(new_inode)->i_sem);
667 if (old_dir_entry)
668 drop_nlink(new_inode);
669 drop_nlink(new_inode);
670 up_write(&F2FS_I(new_inode)->i_sem);
671
672 mark_inode_dirty(new_inode);
673
674 if (!new_inode->i_nlink)
675 add_orphan_inode(sbi, new_inode->i_ino);
676 else
677 release_orphan_inode(sbi);
678
679 update_inode_page(old_inode);
680 update_inode_page(new_inode);
681 } else {
682 f2fs_balance_fs(sbi, true);
683
684 f2fs_lock_op(sbi);
685
686 err = f2fs_add_link(new_dentry, old_inode);
687 if (err) {
688 f2fs_unlock_op(sbi);
689 goto out_whiteout;
690 }
691
692 if (old_dir_entry) {
693 inc_nlink(new_dir);
694 update_inode_page(new_dir);
695 }
696 }
697
698 down_write(&F2FS_I(old_inode)->i_sem);
699 file_lost_pino(old_inode);
700 if (new_inode && file_enc_name(new_inode))
701 file_set_enc_name(old_inode);
702 up_write(&F2FS_I(old_inode)->i_sem);
703
704 old_inode->i_ctime = CURRENT_TIME;
705 mark_inode_dirty(old_inode);
706
707 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
708
709 if (whiteout) {
710 whiteout->i_state |= I_LINKABLE;
711 set_inode_flag(F2FS_I(whiteout), FI_INC_LINK);
712 err = f2fs_add_link(old_dentry, whiteout);
713 if (err)
714 goto put_out_dir;
715 whiteout->i_state &= ~I_LINKABLE;
716 iput(whiteout);
717 }
718
719 if (old_dir_entry) {
720 if (old_dir != new_dir && !whiteout) {
721 f2fs_set_link(old_inode, old_dir_entry,
722 old_dir_page, new_dir);
723 update_inode_page(old_inode);
724 } else {
725 f2fs_dentry_kunmap(old_inode, old_dir_page);
726 f2fs_put_page(old_dir_page, 0);
727 }
728 drop_nlink(old_dir);
729 mark_inode_dirty(old_dir);
730 update_inode_page(old_dir);
731 }
732
733 f2fs_unlock_op(sbi);
734
735 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
736 f2fs_sync_fs(sbi->sb, 1);
737 return 0;
738
739 put_out_dir:
740 f2fs_unlock_op(sbi);
741 if (new_page) {
742 f2fs_dentry_kunmap(new_dir, new_page);
743 f2fs_put_page(new_page, 0);
744 }
745 out_whiteout:
746 if (whiteout)
747 iput(whiteout);
748 out_dir:
749 if (old_dir_entry) {
750 f2fs_dentry_kunmap(old_inode, old_dir_page);
751 f2fs_put_page(old_dir_page, 0);
752 }
753 out_old:
754 f2fs_dentry_kunmap(old_dir, old_page);
755 f2fs_put_page(old_page, 0);
756 out:
757 return err;
758 }
759
760 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
761 struct inode *new_dir, struct dentry *new_dentry)
762 {
763 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
764 struct inode *old_inode = d_inode(old_dentry);
765 struct inode *new_inode = d_inode(new_dentry);
766 struct page *old_dir_page, *new_dir_page;
767 struct page *old_page, *new_page;
768 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
769 struct f2fs_dir_entry *old_entry, *new_entry;
770 int old_nlink = 0, new_nlink = 0;
771 int err = -ENOENT;
772
773 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
774 (old_dir != new_dir) &&
775 (!f2fs_is_child_context_consistent_with_parent(new_dir,
776 old_inode) ||
777 !f2fs_is_child_context_consistent_with_parent(old_dir,
778 new_inode)))
779 return -EPERM;
780
781 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
782 if (!old_entry)
783 goto out;
784
785 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
786 if (!new_entry)
787 goto out_old;
788
789 /* prepare for updating ".." directory entry info later */
790 if (old_dir != new_dir) {
791 if (S_ISDIR(old_inode->i_mode)) {
792 err = -EIO;
793 old_dir_entry = f2fs_parent_dir(old_inode,
794 &old_dir_page);
795 if (!old_dir_entry)
796 goto out_new;
797 }
798
799 if (S_ISDIR(new_inode->i_mode)) {
800 err = -EIO;
801 new_dir_entry = f2fs_parent_dir(new_inode,
802 &new_dir_page);
803 if (!new_dir_entry)
804 goto out_old_dir;
805 }
806 }
807
808 /*
809 * If cross rename between file and directory those are not
810 * in the same directory, we will inc nlink of file's parent
811 * later, so we should check upper boundary of its nlink.
812 */
813 if ((!old_dir_entry || !new_dir_entry) &&
814 old_dir_entry != new_dir_entry) {
815 old_nlink = old_dir_entry ? -1 : 1;
816 new_nlink = -old_nlink;
817 err = -EMLINK;
818 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
819 (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
820 goto out_new_dir;
821 }
822
823 f2fs_balance_fs(sbi, true);
824
825 f2fs_lock_op(sbi);
826
827 err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
828 if (err)
829 goto out_unlock;
830 if (file_enc_name(new_inode))
831 file_set_enc_name(old_inode);
832
833 err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
834 if (err)
835 goto out_undo;
836 if (file_enc_name(old_inode))
837 file_set_enc_name(new_inode);
838
839 /* update ".." directory entry info of old dentry */
840 if (old_dir_entry)
841 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
842
843 /* update ".." directory entry info of new dentry */
844 if (new_dir_entry)
845 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
846
847 /* update directory entry info of old dir inode */
848 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
849
850 down_write(&F2FS_I(old_inode)->i_sem);
851 file_lost_pino(old_inode);
852 up_write(&F2FS_I(old_inode)->i_sem);
853
854 update_inode_page(old_inode);
855
856 old_dir->i_ctime = CURRENT_TIME;
857 if (old_nlink) {
858 down_write(&F2FS_I(old_dir)->i_sem);
859 if (old_nlink < 0)
860 drop_nlink(old_dir);
861 else
862 inc_nlink(old_dir);
863 up_write(&F2FS_I(old_dir)->i_sem);
864 }
865 mark_inode_dirty(old_dir);
866 update_inode_page(old_dir);
867
868 /* update directory entry info of new dir inode */
869 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
870
871 down_write(&F2FS_I(new_inode)->i_sem);
872 file_lost_pino(new_inode);
873 up_write(&F2FS_I(new_inode)->i_sem);
874
875 update_inode_page(new_inode);
876
877 new_dir->i_ctime = CURRENT_TIME;
878 if (new_nlink) {
879 down_write(&F2FS_I(new_dir)->i_sem);
880 if (new_nlink < 0)
881 drop_nlink(new_dir);
882 else
883 inc_nlink(new_dir);
884 up_write(&F2FS_I(new_dir)->i_sem);
885 }
886 mark_inode_dirty(new_dir);
887 update_inode_page(new_dir);
888
889 f2fs_unlock_op(sbi);
890
891 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
892 f2fs_sync_fs(sbi->sb, 1);
893 return 0;
894 out_undo:
895 /*
896 * Still we may fail to recover name info of f2fs_inode here
897 * Drop it, once its name is set as encrypted
898 */
899 update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
900 out_unlock:
901 f2fs_unlock_op(sbi);
902 out_new_dir:
903 if (new_dir_entry) {
904 f2fs_dentry_kunmap(new_inode, new_dir_page);
905 f2fs_put_page(new_dir_page, 0);
906 }
907 out_old_dir:
908 if (old_dir_entry) {
909 f2fs_dentry_kunmap(old_inode, old_dir_page);
910 f2fs_put_page(old_dir_page, 0);
911 }
912 out_new:
913 f2fs_dentry_kunmap(new_dir, new_page);
914 f2fs_put_page(new_page, 0);
915 out_old:
916 f2fs_dentry_kunmap(old_dir, old_page);
917 f2fs_put_page(old_page, 0);
918 out:
919 return err;
920 }
921
922 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
923 struct inode *new_dir, struct dentry *new_dentry,
924 unsigned int flags)
925 {
926 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
927 return -EINVAL;
928
929 if (flags & RENAME_EXCHANGE) {
930 return f2fs_cross_rename(old_dir, old_dentry,
931 new_dir, new_dentry);
932 }
933 /*
934 * VFS has already handled the new dentry existence case,
935 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
936 */
937 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
938 }
939
940 #ifdef CONFIG_F2FS_FS_ENCRYPTION
941 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
942 struct inode *inode,
943 struct delayed_call *done)
944 {
945 struct page *cpage = NULL;
946 char *caddr, *paddr = NULL;
947 struct f2fs_str cstr = FSTR_INIT(NULL, 0);
948 struct f2fs_str pstr = FSTR_INIT(NULL, 0);
949 struct f2fs_encrypted_symlink_data *sd;
950 loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
951 u32 max_size = inode->i_sb->s_blocksize;
952 int res;
953
954 if (!dentry)
955 return ERR_PTR(-ECHILD);
956
957 res = f2fs_get_encryption_info(inode);
958 if (res)
959 return ERR_PTR(res);
960
961 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
962 if (IS_ERR(cpage))
963 return ERR_CAST(cpage);
964 caddr = page_address(cpage);
965 caddr[size] = 0;
966
967 /* Symlink is encrypted */
968 sd = (struct f2fs_encrypted_symlink_data *)caddr;
969 cstr.len = le16_to_cpu(sd->len);
970
971 /* this is broken symlink case */
972 if (unlikely(cstr.len == 0)) {
973 res = -ENOENT;
974 goto errout;
975 }
976 cstr.name = kmalloc(cstr.len, GFP_NOFS);
977 if (!cstr.name) {
978 res = -ENOMEM;
979 goto errout;
980 }
981 memcpy(cstr.name, sd->encrypted_path, cstr.len);
982
983 /* this is broken symlink case */
984 if (unlikely(cstr.name[0] == 0)) {
985 res = -ENOENT;
986 goto errout;
987 }
988
989 if ((cstr.len + sizeof(struct f2fs_encrypted_symlink_data) - 1) >
990 max_size) {
991 /* Symlink data on the disk is corrupted */
992 res = -EIO;
993 goto errout;
994 }
995 res = f2fs_fname_crypto_alloc_buffer(inode, cstr.len, &pstr);
996 if (res)
997 goto errout;
998
999 res = f2fs_fname_disk_to_usr(inode, NULL, &cstr, &pstr);
1000 if (res < 0)
1001 goto errout;
1002
1003 kfree(cstr.name);
1004
1005 paddr = pstr.name;
1006
1007 /* Null-terminate the name */
1008 paddr[res] = '\0';
1009
1010 page_cache_release(cpage);
1011 set_delayed_call(done, kfree_link, paddr);
1012 return paddr;
1013 errout:
1014 kfree(cstr.name);
1015 f2fs_fname_crypto_free_buffer(&pstr);
1016 page_cache_release(cpage);
1017 return ERR_PTR(res);
1018 }
1019
1020 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1021 .readlink = generic_readlink,
1022 .get_link = f2fs_encrypted_get_link,
1023 .getattr = f2fs_getattr,
1024 .setattr = f2fs_setattr,
1025 #ifdef CONFIG_F2FS_FS_XATTR
1026 .setxattr = generic_setxattr,
1027 .getxattr = generic_getxattr,
1028 .listxattr = f2fs_listxattr,
1029 .removexattr = generic_removexattr,
1030 #endif
1031 };
1032 #endif
1033
1034 const struct inode_operations f2fs_dir_inode_operations = {
1035 .create = f2fs_create,
1036 .lookup = f2fs_lookup,
1037 .link = f2fs_link,
1038 .unlink = f2fs_unlink,
1039 .symlink = f2fs_symlink,
1040 .mkdir = f2fs_mkdir,
1041 .rmdir = f2fs_rmdir,
1042 .mknod = f2fs_mknod,
1043 .rename2 = f2fs_rename2,
1044 .tmpfile = f2fs_tmpfile,
1045 .getattr = f2fs_getattr,
1046 .setattr = f2fs_setattr,
1047 .get_acl = f2fs_get_acl,
1048 .set_acl = f2fs_set_acl,
1049 #ifdef CONFIG_F2FS_FS_XATTR
1050 .setxattr = generic_setxattr,
1051 .getxattr = generic_getxattr,
1052 .listxattr = f2fs_listxattr,
1053 .removexattr = generic_removexattr,
1054 #endif
1055 };
1056
1057 const struct inode_operations f2fs_symlink_inode_operations = {
1058 .readlink = generic_readlink,
1059 .get_link = f2fs_get_link,
1060 .getattr = f2fs_getattr,
1061 .setattr = f2fs_setattr,
1062 #ifdef CONFIG_F2FS_FS_XATTR
1063 .setxattr = generic_setxattr,
1064 .getxattr = generic_getxattr,
1065 .listxattr = f2fs_listxattr,
1066 .removexattr = generic_removexattr,
1067 #endif
1068 };
1069
1070 const struct inode_operations f2fs_special_inode_operations = {
1071 .getattr = f2fs_getattr,
1072 .setattr = f2fs_setattr,
1073 .get_acl = f2fs_get_acl,
1074 .set_acl = f2fs_set_acl,
1075 #ifdef CONFIG_F2FS_FS_XATTR
1076 .setxattr = generic_setxattr,
1077 .getxattr = generic_getxattr,
1078 .listxattr = f2fs_listxattr,
1079 .removexattr = generic_removexattr,
1080 #endif
1081 };
Linux kernel - Deliverables
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