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f2fs: avoid memory allocation failure due to a long length
[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 set_inode_flag(inode, FI_NEW_INODE);
64
65 if (test_opt(sbi, INLINE_XATTR))
66 set_inode_flag(inode, FI_INLINE_XATTR);
67 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
68 set_inode_flag(inode, FI_INLINE_DATA);
69 if (f2fs_may_inline_dentry(inode))
70 set_inode_flag(inode, FI_INLINE_DENTRY);
71
72 f2fs_init_extent_tree(inode, NULL);
73
74 stat_inc_inline_xattr(inode);
75 stat_inc_inline_inode(inode);
76 stat_inc_inline_dir(inode);
77
78 trace_f2fs_new_inode(inode, 0);
79 return inode;
80
81 fail:
82 trace_f2fs_new_inode(inode, err);
83 make_bad_inode(inode);
84 if (nid_free)
85 set_inode_flag(inode, FI_FREE_NID);
86 iput(inode);
87 return ERR_PTR(err);
88 }
89
90 static int is_multimedia_file(const unsigned char *s, const char *sub)
91 {
92 size_t slen = strlen(s);
93 size_t sublen = strlen(sub);
94
95 /*
96 * filename format of multimedia file should be defined as:
97 * "filename + '.' + extension".
98 */
99 if (slen < sublen + 2)
100 return 0;
101
102 if (s[slen - sublen - 1] != '.')
103 return 0;
104
105 return !strncasecmp(s + slen - sublen, sub, sublen);
106 }
107
108 /*
109 * Set multimedia files as cold files for hot/cold data separation
110 */
111 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
112 const unsigned char *name)
113 {
114 int i;
115 __u8 (*extlist)[8] = sbi->raw_super->extension_list;
116
117 int count = le32_to_cpu(sbi->raw_super->extension_count);
118 for (i = 0; i < count; i++) {
119 if (is_multimedia_file(name, extlist[i])) {
120 file_set_cold(inode);
121 break;
122 }
123 }
124 }
125
126 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
127 bool excl)
128 {
129 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
130 struct inode *inode;
131 nid_t ino = 0;
132 int err;
133
134 inode = f2fs_new_inode(dir, mode);
135 if (IS_ERR(inode))
136 return PTR_ERR(inode);
137
138 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
139 set_cold_files(sbi, inode, dentry->d_name.name);
140
141 inode->i_op = &f2fs_file_inode_operations;
142 inode->i_fop = &f2fs_file_operations;
143 inode->i_mapping->a_ops = &f2fs_dblock_aops;
144 ino = inode->i_ino;
145
146 f2fs_balance_fs(sbi, true);
147
148 f2fs_lock_op(sbi);
149 err = f2fs_add_link(dentry, inode);
150 if (err)
151 goto out;
152 f2fs_unlock_op(sbi);
153
154 alloc_nid_done(sbi, ino);
155
156 d_instantiate(dentry, inode);
157 unlock_new_inode(inode);
158
159 if (IS_DIRSYNC(dir))
160 f2fs_sync_fs(sbi->sb, 1);
161 return 0;
162 out:
163 handle_failed_inode(inode);
164 return err;
165 }
166
167 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
168 struct dentry *dentry)
169 {
170 struct inode *inode = d_inode(old_dentry);
171 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
172 int err;
173
174 if (f2fs_encrypted_inode(dir) &&
175 !fscrypt_has_permitted_context(dir, inode))
176 return -EPERM;
177
178 f2fs_balance_fs(sbi, true);
179
180 inode->i_ctime = CURRENT_TIME;
181 ihold(inode);
182
183 set_inode_flag(inode, FI_INC_LINK);
184 f2fs_lock_op(sbi);
185 err = f2fs_add_link(dentry, inode);
186 if (err)
187 goto out;
188 f2fs_unlock_op(sbi);
189
190 d_instantiate(dentry, inode);
191
192 if (IS_DIRSYNC(dir))
193 f2fs_sync_fs(sbi->sb, 1);
194 return 0;
195 out:
196 clear_inode_flag(inode, FI_INC_LINK);
197 iput(inode);
198 f2fs_unlock_op(sbi);
199 return err;
200 }
201
202 struct dentry *f2fs_get_parent(struct dentry *child)
203 {
204 struct qstr dotdot = QSTR_INIT("..", 2);
205 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot);
206 if (!ino)
207 return ERR_PTR(-ENOENT);
208 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
209 }
210
211 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
212 {
213 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
214 struct qstr dot = QSTR_INIT(".", 1);
215 struct qstr dotdot = QSTR_INIT("..", 2);
216 struct f2fs_dir_entry *de;
217 struct page *page;
218 int err = 0;
219
220 if (f2fs_readonly(sbi->sb)) {
221 f2fs_msg(sbi->sb, KERN_INFO,
222 "skip recovering inline_dots inode (ino:%lu, pino:%u) "
223 "in readonly mountpoint", dir->i_ino, pino);
224 return 0;
225 }
226
227 f2fs_balance_fs(sbi, true);
228
229 f2fs_lock_op(sbi);
230
231 de = f2fs_find_entry(dir, &dot, &page);
232 if (de) {
233 f2fs_dentry_kunmap(dir, page);
234 f2fs_put_page(page, 0);
235 } else if (IS_ERR(page)) {
236 err = PTR_ERR(page);
237 goto out;
238 } else {
239 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
240 if (err)
241 goto out;
242 }
243
244 de = f2fs_find_entry(dir, &dotdot, &page);
245 if (de) {
246 f2fs_dentry_kunmap(dir, page);
247 f2fs_put_page(page, 0);
248 } else if (IS_ERR(page)) {
249 err = PTR_ERR(page);
250 } else {
251 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
252 }
253 out:
254 if (!err)
255 clear_inode_flag(dir, FI_INLINE_DOTS);
256
257 f2fs_unlock_op(sbi);
258 return err;
259 }
260
261 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
262 unsigned int flags)
263 {
264 struct inode *inode = NULL;
265 struct f2fs_dir_entry *de;
266 struct page *page;
267 nid_t ino;
268 int err = 0;
269 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
270
271 if (f2fs_encrypted_inode(dir)) {
272 int res = fscrypt_get_encryption_info(dir);
273
274 /*
275 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
276 * created while the directory was encrypted and we
277 * don't have access to the key.
278 */
279 if (fscrypt_has_encryption_key(dir))
280 fscrypt_set_encrypted_dentry(dentry);
281 fscrypt_set_d_op(dentry);
282 if (res && res != -ENOKEY)
283 return ERR_PTR(res);
284 }
285
286 if (dentry->d_name.len > F2FS_NAME_LEN)
287 return ERR_PTR(-ENAMETOOLONG);
288
289 de = f2fs_find_entry(dir, &dentry->d_name, &page);
290 if (!de) {
291 if (IS_ERR(page))
292 return (struct dentry *)page;
293 return d_splice_alias(inode, dentry);
294 }
295
296 ino = le32_to_cpu(de->ino);
297 f2fs_dentry_kunmap(dir, page);
298 f2fs_put_page(page, 0);
299
300 inode = f2fs_iget(dir->i_sb, ino);
301 if (IS_ERR(inode))
302 return ERR_CAST(inode);
303
304 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
305 err = __recover_dot_dentries(dir, root_ino);
306 if (err)
307 goto err_out;
308 }
309
310 if (f2fs_has_inline_dots(inode)) {
311 err = __recover_dot_dentries(inode, dir->i_ino);
312 if (err)
313 goto err_out;
314 }
315 if (!IS_ERR(inode) && f2fs_encrypted_inode(dir) &&
316 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
317 !fscrypt_has_permitted_context(dir, inode)) {
318 bool nokey = f2fs_encrypted_inode(inode) &&
319 !fscrypt_has_encryption_key(inode);
320 err = nokey ? -ENOKEY : -EPERM;
321 goto err_out;
322 }
323 return d_splice_alias(inode, dentry);
324
325 err_out:
326 iput(inode);
327 return ERR_PTR(err);
328 }
329
330 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
331 {
332 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
333 struct inode *inode = d_inode(dentry);
334 struct f2fs_dir_entry *de;
335 struct page *page;
336 int err = -ENOENT;
337
338 trace_f2fs_unlink_enter(dir, dentry);
339
340 de = f2fs_find_entry(dir, &dentry->d_name, &page);
341 if (!de)
342 goto fail;
343
344 f2fs_balance_fs(sbi, true);
345
346 f2fs_lock_op(sbi);
347 err = acquire_orphan_inode(sbi);
348 if (err) {
349 f2fs_unlock_op(sbi);
350 f2fs_dentry_kunmap(dir, page);
351 f2fs_put_page(page, 0);
352 goto fail;
353 }
354 f2fs_delete_entry(de, page, dir, inode);
355 f2fs_unlock_op(sbi);
356
357 if (IS_DIRSYNC(dir))
358 f2fs_sync_fs(sbi->sb, 1);
359 fail:
360 trace_f2fs_unlink_exit(inode, err);
361 return err;
362 }
363
364 static const char *f2fs_get_link(struct dentry *dentry,
365 struct inode *inode,
366 struct delayed_call *done)
367 {
368 const char *link = page_get_link(dentry, inode, done);
369 if (!IS_ERR(link) && !*link) {
370 /* this is broken symlink case */
371 do_delayed_call(done);
372 clear_delayed_call(done);
373 link = ERR_PTR(-ENOENT);
374 }
375 return link;
376 }
377
378 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
379 const char *symname)
380 {
381 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
382 struct inode *inode;
383 size_t len = strlen(symname);
384 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
385 struct fscrypt_symlink_data *sd = NULL;
386 int err;
387
388 if (f2fs_encrypted_inode(dir)) {
389 err = fscrypt_get_encryption_info(dir);
390 if (err)
391 return err;
392
393 if (!fscrypt_has_encryption_key(dir))
394 return -EPERM;
395
396 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
397 sizeof(struct fscrypt_symlink_data));
398 }
399
400 if (disk_link.len > dir->i_sb->s_blocksize)
401 return -ENAMETOOLONG;
402
403 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
404 if (IS_ERR(inode))
405 return PTR_ERR(inode);
406
407 if (f2fs_encrypted_inode(inode))
408 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
409 else
410 inode->i_op = &f2fs_symlink_inode_operations;
411 inode_nohighmem(inode);
412 inode->i_mapping->a_ops = &f2fs_dblock_aops;
413
414 f2fs_balance_fs(sbi, true);
415
416 f2fs_lock_op(sbi);
417 err = f2fs_add_link(dentry, inode);
418 if (err)
419 goto out;
420 f2fs_unlock_op(sbi);
421 alloc_nid_done(sbi, inode->i_ino);
422
423 if (f2fs_encrypted_inode(inode)) {
424 struct qstr istr = QSTR_INIT(symname, len);
425 struct fscrypt_str ostr;
426
427 sd = kzalloc(disk_link.len, GFP_NOFS);
428 if (!sd) {
429 err = -ENOMEM;
430 goto err_out;
431 }
432
433 err = fscrypt_get_encryption_info(inode);
434 if (err)
435 goto err_out;
436
437 if (!fscrypt_has_encryption_key(inode)) {
438 err = -EPERM;
439 goto err_out;
440 }
441
442 ostr.name = sd->encrypted_path;
443 ostr.len = disk_link.len;
444 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
445 if (err < 0)
446 goto err_out;
447
448 sd->len = cpu_to_le16(ostr.len);
449 disk_link.name = (char *)sd;
450 }
451
452 err = page_symlink(inode, disk_link.name, disk_link.len);
453
454 err_out:
455 d_instantiate(dentry, inode);
456 unlock_new_inode(inode);
457
458 /*
459 * Let's flush symlink data in order to avoid broken symlink as much as
460 * possible. Nevertheless, fsyncing is the best way, but there is no
461 * way to get a file descriptor in order to flush that.
462 *
463 * Note that, it needs to do dir->fsync to make this recoverable.
464 * If the symlink path is stored into inline_data, there is no
465 * performance regression.
466 */
467 if (!err) {
468 filemap_write_and_wait_range(inode->i_mapping, 0,
469 disk_link.len - 1);
470
471 if (IS_DIRSYNC(dir))
472 f2fs_sync_fs(sbi->sb, 1);
473 } else {
474 f2fs_unlink(dir, dentry);
475 }
476
477 kfree(sd);
478 return err;
479 out:
480 handle_failed_inode(inode);
481 return err;
482 }
483
484 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
485 {
486 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
487 struct inode *inode;
488 int err;
489
490 inode = f2fs_new_inode(dir, S_IFDIR | mode);
491 if (IS_ERR(inode))
492 return PTR_ERR(inode);
493
494 inode->i_op = &f2fs_dir_inode_operations;
495 inode->i_fop = &f2fs_dir_operations;
496 inode->i_mapping->a_ops = &f2fs_dblock_aops;
497 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
498
499 f2fs_balance_fs(sbi, true);
500
501 set_inode_flag(inode, FI_INC_LINK);
502 f2fs_lock_op(sbi);
503 err = f2fs_add_link(dentry, inode);
504 if (err)
505 goto out_fail;
506 f2fs_unlock_op(sbi);
507
508 alloc_nid_done(sbi, inode->i_ino);
509
510 d_instantiate(dentry, inode);
511 unlock_new_inode(inode);
512
513 if (IS_DIRSYNC(dir))
514 f2fs_sync_fs(sbi->sb, 1);
515 return 0;
516
517 out_fail:
518 clear_inode_flag(inode, FI_INC_LINK);
519 handle_failed_inode(inode);
520 return err;
521 }
522
523 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
524 {
525 struct inode *inode = d_inode(dentry);
526 if (f2fs_empty_dir(inode))
527 return f2fs_unlink(dir, dentry);
528 return -ENOTEMPTY;
529 }
530
531 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
532 umode_t mode, dev_t rdev)
533 {
534 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
535 struct inode *inode;
536 int err = 0;
537
538 inode = f2fs_new_inode(dir, mode);
539 if (IS_ERR(inode))
540 return PTR_ERR(inode);
541
542 init_special_inode(inode, inode->i_mode, rdev);
543 inode->i_op = &f2fs_special_inode_operations;
544
545 f2fs_balance_fs(sbi, true);
546
547 f2fs_lock_op(sbi);
548 err = f2fs_add_link(dentry, inode);
549 if (err)
550 goto out;
551 f2fs_unlock_op(sbi);
552
553 alloc_nid_done(sbi, inode->i_ino);
554
555 d_instantiate(dentry, inode);
556 unlock_new_inode(inode);
557
558 if (IS_DIRSYNC(dir))
559 f2fs_sync_fs(sbi->sb, 1);
560 return 0;
561 out:
562 handle_failed_inode(inode);
563 return err;
564 }
565
566 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
567 umode_t mode, struct inode **whiteout)
568 {
569 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
570 struct inode *inode;
571 int err;
572
573 inode = f2fs_new_inode(dir, mode);
574 if (IS_ERR(inode))
575 return PTR_ERR(inode);
576
577 if (whiteout) {
578 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
579 inode->i_op = &f2fs_special_inode_operations;
580 } else {
581 inode->i_op = &f2fs_file_inode_operations;
582 inode->i_fop = &f2fs_file_operations;
583 inode->i_mapping->a_ops = &f2fs_dblock_aops;
584 }
585
586 f2fs_balance_fs(sbi, true);
587
588 f2fs_lock_op(sbi);
589 err = acquire_orphan_inode(sbi);
590 if (err)
591 goto out;
592
593 err = f2fs_do_tmpfile(inode, dir);
594 if (err)
595 goto release_out;
596
597 /*
598 * add this non-linked tmpfile to orphan list, in this way we could
599 * remove all unused data of tmpfile after abnormal power-off.
600 */
601 add_orphan_inode(inode);
602 alloc_nid_done(sbi, inode->i_ino);
603
604 if (whiteout) {
605 f2fs_i_links_write(inode, false);
606 *whiteout = inode;
607 } else {
608 d_tmpfile(dentry, inode);
609 }
610 /* link_count was changed by d_tmpfile as well. */
611 f2fs_unlock_op(sbi);
612 unlock_new_inode(inode);
613 return 0;
614
615 release_out:
616 release_orphan_inode(sbi);
617 out:
618 handle_failed_inode(inode);
619 return err;
620 }
621
622 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
623 {
624 if (f2fs_encrypted_inode(dir)) {
625 int err = fscrypt_get_encryption_info(dir);
626 if (err)
627 return err;
628 }
629
630 return __f2fs_tmpfile(dir, dentry, mode, NULL);
631 }
632
633 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
634 {
635 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
636 }
637
638 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
639 struct inode *new_dir, struct dentry *new_dentry,
640 unsigned int flags)
641 {
642 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
643 struct inode *old_inode = d_inode(old_dentry);
644 struct inode *new_inode = d_inode(new_dentry);
645 struct inode *whiteout = NULL;
646 struct page *old_dir_page;
647 struct page *old_page, *new_page = NULL;
648 struct f2fs_dir_entry *old_dir_entry = NULL;
649 struct f2fs_dir_entry *old_entry;
650 struct f2fs_dir_entry *new_entry;
651 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
652 int err = -ENOENT;
653
654 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
655 !fscrypt_has_permitted_context(new_dir, old_inode)) {
656 err = -EPERM;
657 goto out;
658 }
659
660 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
661 if (!old_entry)
662 goto out;
663
664 if (S_ISDIR(old_inode->i_mode)) {
665 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
666 if (!old_dir_entry) {
667 err = PTR_ERR(old_dir_page);
668 goto out_old;
669 }
670 }
671
672 if (flags & RENAME_WHITEOUT) {
673 err = f2fs_create_whiteout(old_dir, &whiteout);
674 if (err)
675 goto out_dir;
676 }
677
678 if (new_inode) {
679
680 err = -ENOTEMPTY;
681 if (old_dir_entry && !f2fs_empty_dir(new_inode))
682 goto out_whiteout;
683
684 err = -ENOENT;
685 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
686 &new_page);
687 if (!new_entry)
688 goto out_whiteout;
689
690 f2fs_balance_fs(sbi, true);
691
692 f2fs_lock_op(sbi);
693
694 err = acquire_orphan_inode(sbi);
695 if (err)
696 goto put_out_dir;
697
698 err = update_dent_inode(old_inode, new_inode,
699 &new_dentry->d_name);
700 if (err) {
701 release_orphan_inode(sbi);
702 goto put_out_dir;
703 }
704
705 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
706
707 new_inode->i_ctime = CURRENT_TIME;
708 down_write(&F2FS_I(new_inode)->i_sem);
709 if (old_dir_entry)
710 f2fs_i_links_write(new_inode, false);
711 f2fs_i_links_write(new_inode, false);
712 up_write(&F2FS_I(new_inode)->i_sem);
713
714 if (!new_inode->i_nlink)
715 add_orphan_inode(new_inode);
716 else
717 release_orphan_inode(sbi);
718 } else {
719 f2fs_balance_fs(sbi, true);
720
721 f2fs_lock_op(sbi);
722
723 err = f2fs_add_link(new_dentry, old_inode);
724 if (err) {
725 f2fs_unlock_op(sbi);
726 goto out_whiteout;
727 }
728
729 if (old_dir_entry)
730 f2fs_i_links_write(new_dir, true);
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 f2fs_mark_inode_dirty_sync(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(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 } else {
779 f2fs_dentry_kunmap(old_inode, old_dir_page);
780 f2fs_put_page(old_dir_page, 0);
781 }
782 f2fs_i_links_write(old_dir, false);
783 }
784
785 f2fs_unlock_op(sbi);
786
787 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
788 f2fs_sync_fs(sbi->sb, 1);
789 return 0;
790
791 put_out_dir:
792 f2fs_unlock_op(sbi);
793 if (new_page) {
794 f2fs_dentry_kunmap(new_dir, new_page);
795 f2fs_put_page(new_page, 0);
796 }
797 out_whiteout:
798 if (whiteout)
799 iput(whiteout);
800 out_dir:
801 if (old_dir_entry) {
802 f2fs_dentry_kunmap(old_inode, old_dir_page);
803 f2fs_put_page(old_dir_page, 0);
804 }
805 out_old:
806 f2fs_dentry_kunmap(old_dir, old_page);
807 f2fs_put_page(old_page, 0);
808 out:
809 return err;
810 }
811
812 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
813 struct inode *new_dir, struct dentry *new_dentry)
814 {
815 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
816 struct inode *old_inode = d_inode(old_dentry);
817 struct inode *new_inode = d_inode(new_dentry);
818 struct page *old_dir_page, *new_dir_page;
819 struct page *old_page, *new_page;
820 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
821 struct f2fs_dir_entry *old_entry, *new_entry;
822 int old_nlink = 0, new_nlink = 0;
823 int err = -ENOENT;
824
825 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
826 (old_dir != new_dir) &&
827 (!fscrypt_has_permitted_context(new_dir, old_inode) ||
828 !fscrypt_has_permitted_context(old_dir, new_inode)))
829 return -EPERM;
830
831 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
832 if (!old_entry)
833 goto out;
834
835 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
836 if (!new_entry)
837 goto out_old;
838
839 /* prepare for updating ".." directory entry info later */
840 if (old_dir != new_dir) {
841 if (S_ISDIR(old_inode->i_mode)) {
842 old_dir_entry = f2fs_parent_dir(old_inode,
843 &old_dir_page);
844 if (!old_dir_entry) {
845 err = PTR_ERR(old_dir_page);
846 goto out_new;
847 }
848 }
849
850 if (S_ISDIR(new_inode->i_mode)) {
851 new_dir_entry = f2fs_parent_dir(new_inode,
852 &new_dir_page);
853 if (!new_dir_entry) {
854 err = PTR_ERR(new_dir_page);
855 goto out_old_dir;
856 }
857 }
858 }
859
860 /*
861 * If cross rename between file and directory those are not
862 * in the same directory, we will inc nlink of file's parent
863 * later, so we should check upper boundary of its nlink.
864 */
865 if ((!old_dir_entry || !new_dir_entry) &&
866 old_dir_entry != new_dir_entry) {
867 old_nlink = old_dir_entry ? -1 : 1;
868 new_nlink = -old_nlink;
869 err = -EMLINK;
870 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
871 (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
872 goto out_new_dir;
873 }
874
875 f2fs_balance_fs(sbi, true);
876
877 f2fs_lock_op(sbi);
878
879 err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
880 if (err)
881 goto out_unlock;
882 if (file_enc_name(new_inode))
883 file_set_enc_name(old_inode);
884
885 err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
886 if (err)
887 goto out_undo;
888 if (file_enc_name(old_inode))
889 file_set_enc_name(new_inode);
890
891 /* update ".." directory entry info of old dentry */
892 if (old_dir_entry)
893 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
894
895 /* update ".." directory entry info of new dentry */
896 if (new_dir_entry)
897 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
898
899 /* update directory entry info of old dir inode */
900 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
901
902 down_write(&F2FS_I(old_inode)->i_sem);
903 file_lost_pino(old_inode);
904 up_write(&F2FS_I(old_inode)->i_sem);
905
906 old_dir->i_ctime = CURRENT_TIME;
907 if (old_nlink) {
908 down_write(&F2FS_I(old_dir)->i_sem);
909 f2fs_i_links_write(old_dir, old_nlink > 0);
910 up_write(&F2FS_I(old_dir)->i_sem);
911 }
912 f2fs_mark_inode_dirty_sync(old_dir);
913
914 /* update directory entry info of new dir inode */
915 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
916
917 down_write(&F2FS_I(new_inode)->i_sem);
918 file_lost_pino(new_inode);
919 up_write(&F2FS_I(new_inode)->i_sem);
920
921 new_dir->i_ctime = CURRENT_TIME;
922 if (new_nlink) {
923 down_write(&F2FS_I(new_dir)->i_sem);
924 f2fs_i_links_write(new_dir, new_nlink > 0);
925 up_write(&F2FS_I(new_dir)->i_sem);
926 }
927 f2fs_mark_inode_dirty_sync(new_dir);
928
929 f2fs_unlock_op(sbi);
930
931 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
932 f2fs_sync_fs(sbi->sb, 1);
933 return 0;
934 out_undo:
935 /*
936 * Still we may fail to recover name info of f2fs_inode here
937 * Drop it, once its name is set as encrypted
938 */
939 update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
940 out_unlock:
941 f2fs_unlock_op(sbi);
942 out_new_dir:
943 if (new_dir_entry) {
944 f2fs_dentry_kunmap(new_inode, new_dir_page);
945 f2fs_put_page(new_dir_page, 0);
946 }
947 out_old_dir:
948 if (old_dir_entry) {
949 f2fs_dentry_kunmap(old_inode, old_dir_page);
950 f2fs_put_page(old_dir_page, 0);
951 }
952 out_new:
953 f2fs_dentry_kunmap(new_dir, new_page);
954 f2fs_put_page(new_page, 0);
955 out_old:
956 f2fs_dentry_kunmap(old_dir, old_page);
957 f2fs_put_page(old_page, 0);
958 out:
959 return err;
960 }
961
962 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
963 struct inode *new_dir, struct dentry *new_dentry,
964 unsigned int flags)
965 {
966 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
967 return -EINVAL;
968
969 if (flags & RENAME_EXCHANGE) {
970 return f2fs_cross_rename(old_dir, old_dentry,
971 new_dir, new_dentry);
972 }
973 /*
974 * VFS has already handled the new dentry existence case,
975 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
976 */
977 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
978 }
979
980 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
981 struct inode *inode,
982 struct delayed_call *done)
983 {
984 struct page *cpage = NULL;
985 char *caddr, *paddr = NULL;
986 struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
987 struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
988 struct fscrypt_symlink_data *sd;
989 loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
990 u32 max_size = inode->i_sb->s_blocksize;
991 int res;
992
993 if (!dentry)
994 return ERR_PTR(-ECHILD);
995
996 res = fscrypt_get_encryption_info(inode);
997 if (res)
998 return ERR_PTR(res);
999
1000 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1001 if (IS_ERR(cpage))
1002 return ERR_CAST(cpage);
1003 caddr = page_address(cpage);
1004 caddr[size] = 0;
1005
1006 /* Symlink is encrypted */
1007 sd = (struct fscrypt_symlink_data *)caddr;
1008 cstr.name = sd->encrypted_path;
1009 cstr.len = le16_to_cpu(sd->len);
1010
1011 /* this is broken symlink case */
1012 if (unlikely(cstr.len == 0)) {
1013 res = -ENOENT;
1014 goto errout;
1015 }
1016
1017 if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1018 /* Symlink data on the disk is corrupted */
1019 res = -EIO;
1020 goto errout;
1021 }
1022 res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1023 if (res)
1024 goto errout;
1025
1026 res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1027 if (res < 0)
1028 goto errout;
1029
1030 /* this is broken symlink case */
1031 if (unlikely(pstr.name[0] == 0)) {
1032 res = -ENOENT;
1033 goto errout;
1034 }
1035
1036 paddr = pstr.name;
1037
1038 /* Null-terminate the name */
1039 paddr[res] = '\0';
1040
1041 put_page(cpage);
1042 set_delayed_call(done, kfree_link, paddr);
1043 return paddr;
1044 errout:
1045 fscrypt_fname_free_buffer(&pstr);
1046 put_page(cpage);
1047 return ERR_PTR(res);
1048 }
1049
1050 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1051 .readlink = generic_readlink,
1052 .get_link = f2fs_encrypted_get_link,
1053 .getattr = f2fs_getattr,
1054 .setattr = f2fs_setattr,
1055 #ifdef CONFIG_F2FS_FS_XATTR
1056 .setxattr = generic_setxattr,
1057 .getxattr = generic_getxattr,
1058 .listxattr = f2fs_listxattr,
1059 .removexattr = generic_removexattr,
1060 #endif
1061 };
1062
1063 const struct inode_operations f2fs_dir_inode_operations = {
1064 .create = f2fs_create,
1065 .lookup = f2fs_lookup,
1066 .link = f2fs_link,
1067 .unlink = f2fs_unlink,
1068 .symlink = f2fs_symlink,
1069 .mkdir = f2fs_mkdir,
1070 .rmdir = f2fs_rmdir,
1071 .mknod = f2fs_mknod,
1072 .rename2 = f2fs_rename2,
1073 .tmpfile = f2fs_tmpfile,
1074 .getattr = f2fs_getattr,
1075 .setattr = f2fs_setattr,
1076 .get_acl = f2fs_get_acl,
1077 .set_acl = f2fs_set_acl,
1078 #ifdef CONFIG_F2FS_FS_XATTR
1079 .setxattr = generic_setxattr,
1080 .getxattr = generic_getxattr,
1081 .listxattr = f2fs_listxattr,
1082 .removexattr = generic_removexattr,
1083 #endif
1084 };
1085
1086 const struct inode_operations f2fs_symlink_inode_operations = {
1087 .readlink = generic_readlink,
1088 .get_link = f2fs_get_link,
1089 .getattr = f2fs_getattr,
1090 .setattr = f2fs_setattr,
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_special_inode_operations = {
1100 .getattr = f2fs_getattr,
1101 .setattr = f2fs_setattr,
1102 .get_acl = f2fs_get_acl,
1103 .set_acl = f2fs_set_acl,
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 };
Linux kernel - Deliverables
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