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