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Restartable sequences: self-tests
[deliverable/linux.git] / fs / f2fs / namei.c
1 /*
2 * fs/f2fs/namei.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11 #include <linux/fs.h>
12 #include <linux/f2fs_fs.h>
13 #include <linux/pagemap.h>
14 #include <linux/sched.h>
15 #include <linux/ctype.h>
16 #include <linux/dcache.h>
17 #include <linux/namei.h>
18
19 #include "f2fs.h"
20 #include "node.h"
21 #include "xattr.h"
22 #include "acl.h"
23 #include <trace/events/f2fs.h>
24
25 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
26 {
27 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
28 nid_t ino;
29 struct inode *inode;
30 bool nid_free = false;
31 int err;
32
33 inode = new_inode(dir->i_sb);
34 if (!inode)
35 return ERR_PTR(-ENOMEM);
36
37 f2fs_lock_op(sbi);
38 if (!alloc_nid(sbi, &ino)) {
39 f2fs_unlock_op(sbi);
40 err = -ENOSPC;
41 goto fail;
42 }
43 f2fs_unlock_op(sbi);
44
45 inode_init_owner(inode, dir, mode);
46
47 inode->i_ino = ino;
48 inode->i_blocks = 0;
49 inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME;
50 inode->i_generation = sbi->s_next_generation++;
51
52 err = insert_inode_locked(inode);
53 if (err) {
54 err = -EINVAL;
55 nid_free = true;
56 goto fail;
57 }
58
59 /* If the directory encrypted, then we should encrypt the inode. */
60 if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
61 f2fs_set_encrypted_inode(inode);
62
63 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
64 set_inode_flag(F2FS_I(inode), FI_INLINE_DATA);
65 if (f2fs_may_inline_dentry(inode))
66 set_inode_flag(F2FS_I(inode), FI_INLINE_DENTRY);
67
68 f2fs_init_extent_tree(inode, NULL);
69
70 stat_inc_inline_xattr(inode);
71 stat_inc_inline_inode(inode);
72 stat_inc_inline_dir(inode);
73
74 trace_f2fs_new_inode(inode, 0);
75 mark_inode_dirty(inode);
76 return inode;
77
78 fail:
79 trace_f2fs_new_inode(inode, err);
80 make_bad_inode(inode);
81 if (nid_free)
82 set_inode_flag(F2FS_I(inode), FI_FREE_NID);
83 iput(inode);
84 return ERR_PTR(err);
85 }
86
87 static int is_multimedia_file(const unsigned char *s, const char *sub)
88 {
89 size_t slen = strlen(s);
90 size_t sublen = strlen(sub);
91
92 /*
93 * filename format of multimedia file should be defined as:
94 * "filename + '.' + extension".
95 */
96 if (slen < sublen + 2)
97 return 0;
98
99 if (s[slen - sublen - 1] != '.')
100 return 0;
101
102 return !strncasecmp(s + slen - sublen, sub, sublen);
103 }
104
105 /*
106 * Set multimedia files as cold files for hot/cold data separation
107 */
108 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
109 const unsigned char *name)
110 {
111 int i;
112 __u8 (*extlist)[8] = sbi->raw_super->extension_list;
113
114 int count = le32_to_cpu(sbi->raw_super->extension_count);
115 for (i = 0; i < count; i++) {
116 if (is_multimedia_file(name, extlist[i])) {
117 file_set_cold(inode);
118 break;
119 }
120 }
121 }
122
123 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
124 bool excl)
125 {
126 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
127 struct inode *inode;
128 nid_t ino = 0;
129 int err;
130
131 inode = f2fs_new_inode(dir, mode);
132 if (IS_ERR(inode))
133 return PTR_ERR(inode);
134
135 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
136 set_cold_files(sbi, inode, dentry->d_name.name);
137
138 inode->i_op = &f2fs_file_inode_operations;
139 inode->i_fop = &f2fs_file_operations;
140 inode->i_mapping->a_ops = &f2fs_dblock_aops;
141 ino = inode->i_ino;
142
143 f2fs_balance_fs(sbi, true);
144
145 f2fs_lock_op(sbi);
146 err = f2fs_add_link(dentry, inode);
147 if (err)
148 goto out;
149 f2fs_unlock_op(sbi);
150
151 alloc_nid_done(sbi, ino);
152
153 d_instantiate(dentry, inode);
154 unlock_new_inode(inode);
155
156 if (IS_DIRSYNC(dir))
157 f2fs_sync_fs(sbi->sb, 1);
158 return 0;
159 out:
160 handle_failed_inode(inode);
161 return err;
162 }
163
164 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
165 struct dentry *dentry)
166 {
167 struct inode *inode = d_inode(old_dentry);
168 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
169 int err;
170
171 if (f2fs_encrypted_inode(dir) &&
172 !fscrypt_has_permitted_context(dir, inode))
173 return -EPERM;
174
175 f2fs_balance_fs(sbi, true);
176
177 inode->i_ctime = CURRENT_TIME;
178 ihold(inode);
179
180 set_inode_flag(F2FS_I(inode), FI_INC_LINK);
181 f2fs_lock_op(sbi);
182 err = f2fs_add_link(dentry, inode);
183 if (err)
184 goto out;
185 f2fs_unlock_op(sbi);
186
187 d_instantiate(dentry, inode);
188
189 if (IS_DIRSYNC(dir))
190 f2fs_sync_fs(sbi->sb, 1);
191 return 0;
192 out:
193 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
194 iput(inode);
195 f2fs_unlock_op(sbi);
196 return err;
197 }
198
199 struct dentry *f2fs_get_parent(struct dentry *child)
200 {
201 struct qstr dotdot = QSTR_INIT("..", 2);
202 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot);
203 if (!ino)
204 return ERR_PTR(-ENOENT);
205 return d_obtain_alias(f2fs_iget(child->d_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 (f2fs_encrypted_inode(dir)) {
266 int res = fscrypt_get_encryption_info(dir);
267
268 /*
269 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
270 * created while the directory was encrypted and we
271 * don't have access to the key.
272 */
273 if (fscrypt_has_encryption_key(dir))
274 fscrypt_set_encrypted_dentry(dentry);
275 fscrypt_set_d_op(dentry);
276 if (res && res != -ENOKEY)
277 return ERR_PTR(res);
278 }
279
280 if (dentry->d_name.len > F2FS_NAME_LEN)
281 return ERR_PTR(-ENAMETOOLONG);
282
283 de = f2fs_find_entry(dir, &dentry->d_name, &page);
284 if (!de)
285 return d_splice_alias(inode, dentry);
286
287 ino = le32_to_cpu(de->ino);
288 f2fs_dentry_kunmap(dir, page);
289 f2fs_put_page(page, 0);
290
291 inode = f2fs_iget(dir->i_sb, ino);
292 if (IS_ERR(inode))
293 return ERR_CAST(inode);
294
295 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
296 err = __recover_dot_dentries(dir, root_ino);
297 if (err)
298 goto err_out;
299 }
300
301 if (f2fs_has_inline_dots(inode)) {
302 err = __recover_dot_dentries(inode, dir->i_ino);
303 if (err)
304 goto err_out;
305 }
306 if (!IS_ERR(inode) && f2fs_encrypted_inode(dir) &&
307 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
308 !fscrypt_has_permitted_context(dir, inode)) {
309 bool nokey = f2fs_encrypted_inode(inode) &&
310 !fscrypt_has_encryption_key(inode);
311 err = nokey ? -ENOKEY : -EPERM;
312 goto err_out;
313 }
314 return d_splice_alias(inode, dentry);
315
316 err_out:
317 iput(inode);
318 return ERR_PTR(err);
319 }
320
321 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
322 {
323 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
324 struct inode *inode = d_inode(dentry);
325 struct f2fs_dir_entry *de;
326 struct page *page;
327 int err = -ENOENT;
328
329 trace_f2fs_unlink_enter(dir, dentry);
330
331 de = f2fs_find_entry(dir, &dentry->d_name, &page);
332 if (!de)
333 goto fail;
334
335 f2fs_balance_fs(sbi, true);
336
337 f2fs_lock_op(sbi);
338 err = acquire_orphan_inode(sbi);
339 if (err) {
340 f2fs_unlock_op(sbi);
341 f2fs_dentry_kunmap(dir, page);
342 f2fs_put_page(page, 0);
343 goto fail;
344 }
345 f2fs_delete_entry(de, page, dir, inode);
346 f2fs_unlock_op(sbi);
347
348 /* In order to evict this inode, we set it dirty */
349 mark_inode_dirty(inode);
350
351 if (IS_DIRSYNC(dir))
352 f2fs_sync_fs(sbi->sb, 1);
353 fail:
354 trace_f2fs_unlink_exit(inode, err);
355 return err;
356 }
357
358 static const char *f2fs_get_link(struct dentry *dentry,
359 struct inode *inode,
360 struct delayed_call *done)
361 {
362 const char *link = page_get_link(dentry, inode, done);
363 if (!IS_ERR(link) && !*link) {
364 /* this is broken symlink case */
365 do_delayed_call(done);
366 clear_delayed_call(done);
367 link = ERR_PTR(-ENOENT);
368 }
369 return link;
370 }
371
372 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
373 const char *symname)
374 {
375 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
376 struct inode *inode;
377 size_t len = strlen(symname);
378 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
379 struct fscrypt_symlink_data *sd = NULL;
380 int err;
381
382 if (f2fs_encrypted_inode(dir)) {
383 err = fscrypt_get_encryption_info(dir);
384 if (err)
385 return err;
386
387 if (!fscrypt_has_encryption_key(dir))
388 return -EPERM;
389
390 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
391 sizeof(struct fscrypt_symlink_data));
392 }
393
394 if (disk_link.len > dir->i_sb->s_blocksize)
395 return -ENAMETOOLONG;
396
397 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
398 if (IS_ERR(inode))
399 return PTR_ERR(inode);
400
401 if (f2fs_encrypted_inode(inode))
402 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
403 else
404 inode->i_op = &f2fs_symlink_inode_operations;
405 inode_nohighmem(inode);
406 inode->i_mapping->a_ops = &f2fs_dblock_aops;
407
408 f2fs_balance_fs(sbi, true);
409
410 f2fs_lock_op(sbi);
411 err = f2fs_add_link(dentry, inode);
412 if (err)
413 goto out;
414 f2fs_unlock_op(sbi);
415 alloc_nid_done(sbi, inode->i_ino);
416
417 if (f2fs_encrypted_inode(inode)) {
418 struct qstr istr = QSTR_INIT(symname, len);
419 struct fscrypt_str ostr;
420
421 sd = kzalloc(disk_link.len, GFP_NOFS);
422 if (!sd) {
423 err = -ENOMEM;
424 goto err_out;
425 }
426
427 err = fscrypt_get_encryption_info(inode);
428 if (err)
429 goto err_out;
430
431 if (!fscrypt_has_encryption_key(inode)) {
432 err = -EPERM;
433 goto err_out;
434 }
435
436 ostr.name = sd->encrypted_path;
437 ostr.len = disk_link.len;
438 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
439 if (err < 0)
440 goto err_out;
441
442 sd->len = cpu_to_le16(ostr.len);
443 disk_link.name = (char *)sd;
444 }
445
446 err = page_symlink(inode, disk_link.name, disk_link.len);
447
448 err_out:
449 d_instantiate(dentry, inode);
450 unlock_new_inode(inode);
451
452 /*
453 * Let's flush symlink data in order to avoid broken symlink as much as
454 * possible. Nevertheless, fsyncing is the best way, but there is no
455 * way to get a file descriptor in order to flush that.
456 *
457 * Note that, it needs to do dir->fsync to make this recoverable.
458 * If the symlink path is stored into inline_data, there is no
459 * performance regression.
460 */
461 if (!err) {
462 filemap_write_and_wait_range(inode->i_mapping, 0,
463 disk_link.len - 1);
464
465 if (IS_DIRSYNC(dir))
466 f2fs_sync_fs(sbi->sb, 1);
467 } else {
468 f2fs_unlink(dir, dentry);
469 }
470
471 kfree(sd);
472 return err;
473 out:
474 handle_failed_inode(inode);
475 return err;
476 }
477
478 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
479 {
480 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
481 struct inode *inode;
482 int err;
483
484 inode = f2fs_new_inode(dir, S_IFDIR | mode);
485 if (IS_ERR(inode))
486 return PTR_ERR(inode);
487
488 inode->i_op = &f2fs_dir_inode_operations;
489 inode->i_fop = &f2fs_dir_operations;
490 inode->i_mapping->a_ops = &f2fs_dblock_aops;
491 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
492
493 f2fs_balance_fs(sbi, true);
494
495 set_inode_flag(F2FS_I(inode), FI_INC_LINK);
496 f2fs_lock_op(sbi);
497 err = f2fs_add_link(dentry, inode);
498 if (err)
499 goto out_fail;
500 f2fs_unlock_op(sbi);
501
502 alloc_nid_done(sbi, inode->i_ino);
503
504 d_instantiate(dentry, inode);
505 unlock_new_inode(inode);
506
507 if (IS_DIRSYNC(dir))
508 f2fs_sync_fs(sbi->sb, 1);
509 return 0;
510
511 out_fail:
512 clear_inode_flag(F2FS_I(inode), FI_INC_LINK);
513 handle_failed_inode(inode);
514 return err;
515 }
516
517 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
518 {
519 struct inode *inode = d_inode(dentry);
520 if (f2fs_empty_dir(inode))
521 return f2fs_unlink(dir, dentry);
522 return -ENOTEMPTY;
523 }
524
525 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
526 umode_t mode, dev_t rdev)
527 {
528 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
529 struct inode *inode;
530 int err = 0;
531
532 inode = f2fs_new_inode(dir, mode);
533 if (IS_ERR(inode))
534 return PTR_ERR(inode);
535
536 init_special_inode(inode, inode->i_mode, rdev);
537 inode->i_op = &f2fs_special_inode_operations;
538
539 f2fs_balance_fs(sbi, true);
540
541 f2fs_lock_op(sbi);
542 err = f2fs_add_link(dentry, inode);
543 if (err)
544 goto out;
545 f2fs_unlock_op(sbi);
546
547 alloc_nid_done(sbi, inode->i_ino);
548
549 d_instantiate(dentry, inode);
550 unlock_new_inode(inode);
551
552 if (IS_DIRSYNC(dir))
553 f2fs_sync_fs(sbi->sb, 1);
554 return 0;
555 out:
556 handle_failed_inode(inode);
557 return err;
558 }
559
560 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
561 umode_t mode, struct inode **whiteout)
562 {
563 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
564 struct inode *inode;
565 int err;
566
567 inode = f2fs_new_inode(dir, mode);
568 if (IS_ERR(inode))
569 return PTR_ERR(inode);
570
571 if (whiteout) {
572 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
573 inode->i_op = &f2fs_special_inode_operations;
574 } else {
575 inode->i_op = &f2fs_file_inode_operations;
576 inode->i_fop = &f2fs_file_operations;
577 inode->i_mapping->a_ops = &f2fs_dblock_aops;
578 }
579
580 f2fs_balance_fs(sbi, true);
581
582 f2fs_lock_op(sbi);
583 err = acquire_orphan_inode(sbi);
584 if (err)
585 goto out;
586
587 err = f2fs_do_tmpfile(inode, dir);
588 if (err)
589 goto release_out;
590
591 /*
592 * add this non-linked tmpfile to orphan list, in this way we could
593 * remove all unused data of tmpfile after abnormal power-off.
594 */
595 add_orphan_inode(sbi, inode->i_ino);
596 f2fs_unlock_op(sbi);
597
598 alloc_nid_done(sbi, inode->i_ino);
599
600 if (whiteout) {
601 inode_dec_link_count(inode);
602 *whiteout = inode;
603 } else {
604 d_tmpfile(dentry, inode);
605 }
606 unlock_new_inode(inode);
607 return 0;
608
609 release_out:
610 release_orphan_inode(sbi);
611 out:
612 handle_failed_inode(inode);
613 return err;
614 }
615
616 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
617 {
618 if (f2fs_encrypted_inode(dir)) {
619 int err = fscrypt_get_encryption_info(dir);
620 if (err)
621 return err;
622 }
623
624 return __f2fs_tmpfile(dir, dentry, mode, NULL);
625 }
626
627 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
628 {
629 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
630 }
631
632 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
633 struct inode *new_dir, struct dentry *new_dentry,
634 unsigned int flags)
635 {
636 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
637 struct inode *old_inode = d_inode(old_dentry);
638 struct inode *new_inode = d_inode(new_dentry);
639 struct inode *whiteout = NULL;
640 struct page *old_dir_page;
641 struct page *old_page, *new_page = NULL;
642 struct f2fs_dir_entry *old_dir_entry = NULL;
643 struct f2fs_dir_entry *old_entry;
644 struct f2fs_dir_entry *new_entry;
645 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
646 int err = -ENOENT;
647
648 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
649 !fscrypt_has_permitted_context(new_dir, old_inode)) {
650 err = -EPERM;
651 goto out;
652 }
653
654 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
655 if (!old_entry)
656 goto out;
657
658 if (S_ISDIR(old_inode->i_mode)) {
659 err = -EIO;
660 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
661 if (!old_dir_entry)
662 goto out_old;
663 }
664
665 if (flags & RENAME_WHITEOUT) {
666 err = f2fs_create_whiteout(old_dir, &whiteout);
667 if (err)
668 goto out_dir;
669 }
670
671 if (new_inode) {
672
673 err = -ENOTEMPTY;
674 if (old_dir_entry && !f2fs_empty_dir(new_inode))
675 goto out_whiteout;
676
677 err = -ENOENT;
678 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
679 &new_page);
680 if (!new_entry)
681 goto out_whiteout;
682
683 f2fs_balance_fs(sbi, true);
684
685 f2fs_lock_op(sbi);
686
687 err = acquire_orphan_inode(sbi);
688 if (err)
689 goto put_out_dir;
690
691 err = update_dent_inode(old_inode, new_inode,
692 &new_dentry->d_name);
693 if (err) {
694 release_orphan_inode(sbi);
695 goto put_out_dir;
696 }
697
698 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
699
700 new_inode->i_ctime = CURRENT_TIME;
701 down_write(&F2FS_I(new_inode)->i_sem);
702 if (old_dir_entry)
703 drop_nlink(new_inode);
704 drop_nlink(new_inode);
705 up_write(&F2FS_I(new_inode)->i_sem);
706
707 mark_inode_dirty(new_inode);
708
709 if (!new_inode->i_nlink)
710 add_orphan_inode(sbi, new_inode->i_ino);
711 else
712 release_orphan_inode(sbi);
713
714 update_inode_page(old_inode);
715 update_inode_page(new_inode);
716 } else {
717 f2fs_balance_fs(sbi, true);
718
719 f2fs_lock_op(sbi);
720
721 err = f2fs_add_link(new_dentry, old_inode);
722 if (err) {
723 f2fs_unlock_op(sbi);
724 goto out_whiteout;
725 }
726
727 if (old_dir_entry) {
728 inc_nlink(new_dir);
729 update_inode_page(new_dir);
730 }
731
732 /*
733 * old entry and new entry can locate in the same inline
734 * dentry in inode, when attaching new entry in inline dentry,
735 * it could force inline dentry conversion, after that,
736 * old_entry and old_page will point to wrong address, in
737 * order to avoid this, let's do the check and update here.
738 */
739 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
740 f2fs_put_page(old_page, 0);
741 old_page = NULL;
742
743 old_entry = f2fs_find_entry(old_dir,
744 &old_dentry->d_name, &old_page);
745 if (!old_entry) {
746 err = -EIO;
747 f2fs_unlock_op(sbi);
748 goto out_whiteout;
749 }
750 }
751 }
752
753 down_write(&F2FS_I(old_inode)->i_sem);
754 file_lost_pino(old_inode);
755 if (new_inode && file_enc_name(new_inode))
756 file_set_enc_name(old_inode);
757 up_write(&F2FS_I(old_inode)->i_sem);
758
759 old_inode->i_ctime = CURRENT_TIME;
760 mark_inode_dirty(old_inode);
761
762 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
763
764 if (whiteout) {
765 whiteout->i_state |= I_LINKABLE;
766 set_inode_flag(F2FS_I(whiteout), FI_INC_LINK);
767 err = f2fs_add_link(old_dentry, whiteout);
768 if (err)
769 goto put_out_dir;
770 whiteout->i_state &= ~I_LINKABLE;
771 iput(whiteout);
772 }
773
774 if (old_dir_entry) {
775 if (old_dir != new_dir && !whiteout) {
776 f2fs_set_link(old_inode, old_dir_entry,
777 old_dir_page, new_dir);
778 update_inode_page(old_inode);
779 } else {
780 f2fs_dentry_kunmap(old_inode, old_dir_page);
781 f2fs_put_page(old_dir_page, 0);
782 }
783 drop_nlink(old_dir);
784 mark_inode_dirty(old_dir);
785 update_inode_page(old_dir);
786 }
787
788 f2fs_unlock_op(sbi);
789
790 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
791 f2fs_sync_fs(sbi->sb, 1);
792 return 0;
793
794 put_out_dir:
795 f2fs_unlock_op(sbi);
796 if (new_page) {
797 f2fs_dentry_kunmap(new_dir, new_page);
798 f2fs_put_page(new_page, 0);
799 }
800 out_whiteout:
801 if (whiteout)
802 iput(whiteout);
803 out_dir:
804 if (old_dir_entry) {
805 f2fs_dentry_kunmap(old_inode, old_dir_page);
806 f2fs_put_page(old_dir_page, 0);
807 }
808 out_old:
809 f2fs_dentry_kunmap(old_dir, old_page);
810 f2fs_put_page(old_page, 0);
811 out:
812 return err;
813 }
814
815 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
816 struct inode *new_dir, struct dentry *new_dentry)
817 {
818 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
819 struct inode *old_inode = d_inode(old_dentry);
820 struct inode *new_inode = d_inode(new_dentry);
821 struct page *old_dir_page, *new_dir_page;
822 struct page *old_page, *new_page;
823 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
824 struct f2fs_dir_entry *old_entry, *new_entry;
825 int old_nlink = 0, new_nlink = 0;
826 int err = -ENOENT;
827
828 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
829 (old_dir != new_dir) &&
830 (!fscrypt_has_permitted_context(new_dir, old_inode) ||
831 !fscrypt_has_permitted_context(old_dir, new_inode)))
832 return -EPERM;
833
834 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
835 if (!old_entry)
836 goto out;
837
838 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
839 if (!new_entry)
840 goto out_old;
841
842 /* prepare for updating ".." directory entry info later */
843 if (old_dir != new_dir) {
844 if (S_ISDIR(old_inode->i_mode)) {
845 err = -EIO;
846 old_dir_entry = f2fs_parent_dir(old_inode,
847 &old_dir_page);
848 if (!old_dir_entry)
849 goto out_new;
850 }
851
852 if (S_ISDIR(new_inode->i_mode)) {
853 err = -EIO;
854 new_dir_entry = f2fs_parent_dir(new_inode,
855 &new_dir_page);
856 if (!new_dir_entry)
857 goto out_old_dir;
858 }
859 }
860
861 /*
862 * If cross rename between file and directory those are not
863 * in the same directory, we will inc nlink of file's parent
864 * later, so we should check upper boundary of its nlink.
865 */
866 if ((!old_dir_entry || !new_dir_entry) &&
867 old_dir_entry != new_dir_entry) {
868 old_nlink = old_dir_entry ? -1 : 1;
869 new_nlink = -old_nlink;
870 err = -EMLINK;
871 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
872 (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
873 goto out_new_dir;
874 }
875
876 f2fs_balance_fs(sbi, true);
877
878 f2fs_lock_op(sbi);
879
880 err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
881 if (err)
882 goto out_unlock;
883 if (file_enc_name(new_inode))
884 file_set_enc_name(old_inode);
885
886 err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
887 if (err)
888 goto out_undo;
889 if (file_enc_name(old_inode))
890 file_set_enc_name(new_inode);
891
892 /* update ".." directory entry info of old dentry */
893 if (old_dir_entry)
894 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
895
896 /* update ".." directory entry info of new dentry */
897 if (new_dir_entry)
898 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
899
900 /* update directory entry info of old dir inode */
901 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
902
903 down_write(&F2FS_I(old_inode)->i_sem);
904 file_lost_pino(old_inode);
905 up_write(&F2FS_I(old_inode)->i_sem);
906
907 update_inode_page(old_inode);
908
909 old_dir->i_ctime = CURRENT_TIME;
910 if (old_nlink) {
911 down_write(&F2FS_I(old_dir)->i_sem);
912 if (old_nlink < 0)
913 drop_nlink(old_dir);
914 else
915 inc_nlink(old_dir);
916 up_write(&F2FS_I(old_dir)->i_sem);
917 }
918 mark_inode_dirty(old_dir);
919 update_inode_page(old_dir);
920
921 /* update directory entry info of new dir inode */
922 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
923
924 down_write(&F2FS_I(new_inode)->i_sem);
925 file_lost_pino(new_inode);
926 up_write(&F2FS_I(new_inode)->i_sem);
927
928 update_inode_page(new_inode);
929
930 new_dir->i_ctime = CURRENT_TIME;
931 if (new_nlink) {
932 down_write(&F2FS_I(new_dir)->i_sem);
933 if (new_nlink < 0)
934 drop_nlink(new_dir);
935 else
936 inc_nlink(new_dir);
937 up_write(&F2FS_I(new_dir)->i_sem);
938 }
939 mark_inode_dirty(new_dir);
940 update_inode_page(new_dir);
941
942 f2fs_unlock_op(sbi);
943
944 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
945 f2fs_sync_fs(sbi->sb, 1);
946 return 0;
947 out_undo:
948 /*
949 * Still we may fail to recover name info of f2fs_inode here
950 * Drop it, once its name is set as encrypted
951 */
952 update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
953 out_unlock:
954 f2fs_unlock_op(sbi);
955 out_new_dir:
956 if (new_dir_entry) {
957 f2fs_dentry_kunmap(new_inode, new_dir_page);
958 f2fs_put_page(new_dir_page, 0);
959 }
960 out_old_dir:
961 if (old_dir_entry) {
962 f2fs_dentry_kunmap(old_inode, old_dir_page);
963 f2fs_put_page(old_dir_page, 0);
964 }
965 out_new:
966 f2fs_dentry_kunmap(new_dir, new_page);
967 f2fs_put_page(new_page, 0);
968 out_old:
969 f2fs_dentry_kunmap(old_dir, old_page);
970 f2fs_put_page(old_page, 0);
971 out:
972 return err;
973 }
974
975 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
976 struct inode *new_dir, struct dentry *new_dentry,
977 unsigned int flags)
978 {
979 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
980 return -EINVAL;
981
982 if (flags & RENAME_EXCHANGE) {
983 return f2fs_cross_rename(old_dir, old_dentry,
984 new_dir, new_dentry);
985 }
986 /*
987 * VFS has already handled the new dentry existence case,
988 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
989 */
990 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
991 }
992
993 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
994 struct inode *inode,
995 struct delayed_call *done)
996 {
997 struct page *cpage = NULL;
998 char *caddr, *paddr = NULL;
999 struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1000 struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1001 struct fscrypt_symlink_data *sd;
1002 loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
1003 u32 max_size = inode->i_sb->s_blocksize;
1004 int res;
1005
1006 if (!dentry)
1007 return ERR_PTR(-ECHILD);
1008
1009 res = fscrypt_get_encryption_info(inode);
1010 if (res)
1011 return ERR_PTR(res);
1012
1013 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1014 if (IS_ERR(cpage))
1015 return ERR_CAST(cpage);
1016 caddr = page_address(cpage);
1017 caddr[size] = 0;
1018
1019 /* Symlink is encrypted */
1020 sd = (struct fscrypt_symlink_data *)caddr;
1021 cstr.name = sd->encrypted_path;
1022 cstr.len = le16_to_cpu(sd->len);
1023
1024 /* this is broken symlink case */
1025 if (unlikely(cstr.len == 0)) {
1026 res = -ENOENT;
1027 goto errout;
1028 }
1029
1030 if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1031 /* Symlink data on the disk is corrupted */
1032 res = -EIO;
1033 goto errout;
1034 }
1035 res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1036 if (res)
1037 goto errout;
1038
1039 res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1040 if (res < 0)
1041 goto errout;
1042
1043 /* this is broken symlink case */
1044 if (unlikely(pstr.name[0] == 0)) {
1045 res = -ENOENT;
1046 goto errout;
1047 }
1048
1049 paddr = pstr.name;
1050
1051 /* Null-terminate the name */
1052 paddr[res] = '\0';
1053
1054 put_page(cpage);
1055 set_delayed_call(done, kfree_link, paddr);
1056 return paddr;
1057 errout:
1058 fscrypt_fname_free_buffer(&pstr);
1059 put_page(cpage);
1060 return ERR_PTR(res);
1061 }
1062
1063 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1064 .readlink = generic_readlink,
1065 .get_link = f2fs_encrypted_get_link,
1066 .getattr = f2fs_getattr,
1067 .setattr = f2fs_setattr,
1068 #ifdef CONFIG_F2FS_FS_XATTR
1069 .setxattr = generic_setxattr,
1070 .getxattr = generic_getxattr,
1071 .listxattr = f2fs_listxattr,
1072 .removexattr = generic_removexattr,
1073 #endif
1074 };
1075
1076 const struct inode_operations f2fs_dir_inode_operations = {
1077 .create = f2fs_create,
1078 .lookup = f2fs_lookup,
1079 .link = f2fs_link,
1080 .unlink = f2fs_unlink,
1081 .symlink = f2fs_symlink,
1082 .mkdir = f2fs_mkdir,
1083 .rmdir = f2fs_rmdir,
1084 .mknod = f2fs_mknod,
1085 .rename2 = f2fs_rename2,
1086 .tmpfile = f2fs_tmpfile,
1087 .getattr = f2fs_getattr,
1088 .setattr = f2fs_setattr,
1089 .get_acl = f2fs_get_acl,
1090 .set_acl = f2fs_set_acl,
1091 #ifdef CONFIG_F2FS_FS_XATTR
1092 .setxattr = generic_setxattr,
1093 .getxattr = generic_getxattr,
1094 .listxattr = f2fs_listxattr,
1095 .removexattr = generic_removexattr,
1096 #endif
1097 };
1098
1099 const struct inode_operations f2fs_symlink_inode_operations = {
1100 .readlink = generic_readlink,
1101 .get_link = f2fs_get_link,
1102 .getattr = f2fs_getattr,
1103 .setattr = f2fs_setattr,
1104 #ifdef CONFIG_F2FS_FS_XATTR
1105 .setxattr = generic_setxattr,
1106 .getxattr = generic_getxattr,
1107 .listxattr = f2fs_listxattr,
1108 .removexattr = generic_removexattr,
1109 #endif
1110 };
1111
1112 const struct inode_operations f2fs_special_inode_operations = {
1113 .getattr = f2fs_getattr,
1114 .setattr = f2fs_setattr,
1115 .get_acl = f2fs_get_acl,
1116 .set_acl = f2fs_set_acl,
1117 #ifdef CONFIG_F2FS_FS_XATTR
1118 .setxattr = generic_setxattr,
1119 .getxattr = generic_getxattr,
1120 .listxattr = f2fs_listxattr,
1121 .removexattr = generic_removexattr,
1122 #endif
1123 };
Linux kernel - Deliverables
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