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arm/xen: fix SMP guests boot
[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 struct page *page;
206 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
207 if (!ino) {
208 if (IS_ERR(page))
209 return ERR_CAST(page);
210 return ERR_PTR(-ENOENT);
211 }
212 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
213 }
214
215 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
216 {
217 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
218 struct qstr dot = QSTR_INIT(".", 1);
219 struct qstr dotdot = QSTR_INIT("..", 2);
220 struct f2fs_dir_entry *de;
221 struct page *page;
222 int err = 0;
223
224 if (f2fs_readonly(sbi->sb)) {
225 f2fs_msg(sbi->sb, KERN_INFO,
226 "skip recovering inline_dots inode (ino:%lu, pino:%u) "
227 "in readonly mountpoint", dir->i_ino, pino);
228 return 0;
229 }
230
231 f2fs_balance_fs(sbi, true);
232
233 f2fs_lock_op(sbi);
234
235 de = f2fs_find_entry(dir, &dot, &page);
236 if (de) {
237 f2fs_dentry_kunmap(dir, page);
238 f2fs_put_page(page, 0);
239 } else if (IS_ERR(page)) {
240 err = PTR_ERR(page);
241 goto out;
242 } else {
243 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
244 if (err)
245 goto out;
246 }
247
248 de = f2fs_find_entry(dir, &dotdot, &page);
249 if (de) {
250 f2fs_dentry_kunmap(dir, page);
251 f2fs_put_page(page, 0);
252 } else if (IS_ERR(page)) {
253 err = PTR_ERR(page);
254 } else {
255 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
256 }
257 out:
258 if (!err)
259 clear_inode_flag(dir, FI_INLINE_DOTS);
260
261 f2fs_unlock_op(sbi);
262 return err;
263 }
264
265 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
266 unsigned int flags)
267 {
268 struct inode *inode = NULL;
269 struct f2fs_dir_entry *de;
270 struct page *page;
271 nid_t ino;
272 int err = 0;
273 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
274
275 if (f2fs_encrypted_inode(dir)) {
276 int res = fscrypt_get_encryption_info(dir);
277
278 /*
279 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
280 * created while the directory was encrypted and we
281 * don't have access to the key.
282 */
283 if (fscrypt_has_encryption_key(dir))
284 fscrypt_set_encrypted_dentry(dentry);
285 fscrypt_set_d_op(dentry);
286 if (res && res != -ENOKEY)
287 return ERR_PTR(res);
288 }
289
290 if (dentry->d_name.len > F2FS_NAME_LEN)
291 return ERR_PTR(-ENAMETOOLONG);
292
293 de = f2fs_find_entry(dir, &dentry->d_name, &page);
294 if (!de) {
295 if (IS_ERR(page))
296 return (struct dentry *)page;
297 return d_splice_alias(inode, dentry);
298 }
299
300 ino = le32_to_cpu(de->ino);
301 f2fs_dentry_kunmap(dir, page);
302 f2fs_put_page(page, 0);
303
304 inode = f2fs_iget(dir->i_sb, ino);
305 if (IS_ERR(inode))
306 return ERR_CAST(inode);
307
308 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
309 err = __recover_dot_dentries(dir, root_ino);
310 if (err)
311 goto err_out;
312 }
313
314 if (f2fs_has_inline_dots(inode)) {
315 err = __recover_dot_dentries(inode, dir->i_ino);
316 if (err)
317 goto err_out;
318 }
319 if (!IS_ERR(inode) && f2fs_encrypted_inode(dir) &&
320 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
321 !fscrypt_has_permitted_context(dir, inode)) {
322 bool nokey = f2fs_encrypted_inode(inode) &&
323 !fscrypt_has_encryption_key(inode);
324 err = nokey ? -ENOKEY : -EPERM;
325 goto err_out;
326 }
327 return d_splice_alias(inode, dentry);
328
329 err_out:
330 iput(inode);
331 return ERR_PTR(err);
332 }
333
334 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
335 {
336 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
337 struct inode *inode = d_inode(dentry);
338 struct f2fs_dir_entry *de;
339 struct page *page;
340 int err = -ENOENT;
341
342 trace_f2fs_unlink_enter(dir, dentry);
343
344 de = f2fs_find_entry(dir, &dentry->d_name, &page);
345 if (!de) {
346 if (IS_ERR(page))
347 err = PTR_ERR(page);
348 goto fail;
349 }
350
351 f2fs_balance_fs(sbi, true);
352
353 f2fs_lock_op(sbi);
354 err = acquire_orphan_inode(sbi);
355 if (err) {
356 f2fs_unlock_op(sbi);
357 f2fs_dentry_kunmap(dir, page);
358 f2fs_put_page(page, 0);
359 goto fail;
360 }
361 f2fs_delete_entry(de, page, dir, inode);
362 f2fs_unlock_op(sbi);
363
364 if (IS_DIRSYNC(dir))
365 f2fs_sync_fs(sbi->sb, 1);
366 fail:
367 trace_f2fs_unlink_exit(inode, err);
368 return err;
369 }
370
371 static const char *f2fs_get_link(struct dentry *dentry,
372 struct inode *inode,
373 struct delayed_call *done)
374 {
375 const char *link = page_get_link(dentry, inode, done);
376 if (!IS_ERR(link) && !*link) {
377 /* this is broken symlink case */
378 do_delayed_call(done);
379 clear_delayed_call(done);
380 link = ERR_PTR(-ENOENT);
381 }
382 return link;
383 }
384
385 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
386 const char *symname)
387 {
388 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
389 struct inode *inode;
390 size_t len = strlen(symname);
391 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
392 struct fscrypt_symlink_data *sd = NULL;
393 int err;
394
395 if (f2fs_encrypted_inode(dir)) {
396 err = fscrypt_get_encryption_info(dir);
397 if (err)
398 return err;
399
400 if (!fscrypt_has_encryption_key(dir))
401 return -EPERM;
402
403 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
404 sizeof(struct fscrypt_symlink_data));
405 }
406
407 if (disk_link.len > dir->i_sb->s_blocksize)
408 return -ENAMETOOLONG;
409
410 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
411 if (IS_ERR(inode))
412 return PTR_ERR(inode);
413
414 if (f2fs_encrypted_inode(inode))
415 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
416 else
417 inode->i_op = &f2fs_symlink_inode_operations;
418 inode_nohighmem(inode);
419 inode->i_mapping->a_ops = &f2fs_dblock_aops;
420
421 f2fs_balance_fs(sbi, true);
422
423 f2fs_lock_op(sbi);
424 err = f2fs_add_link(dentry, inode);
425 if (err)
426 goto out;
427 f2fs_unlock_op(sbi);
428 alloc_nid_done(sbi, inode->i_ino);
429
430 if (f2fs_encrypted_inode(inode)) {
431 struct qstr istr = QSTR_INIT(symname, len);
432 struct fscrypt_str ostr;
433
434 sd = kzalloc(disk_link.len, GFP_NOFS);
435 if (!sd) {
436 err = -ENOMEM;
437 goto err_out;
438 }
439
440 err = fscrypt_get_encryption_info(inode);
441 if (err)
442 goto err_out;
443
444 if (!fscrypt_has_encryption_key(inode)) {
445 err = -EPERM;
446 goto err_out;
447 }
448
449 ostr.name = sd->encrypted_path;
450 ostr.len = disk_link.len;
451 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
452 if (err < 0)
453 goto err_out;
454
455 sd->len = cpu_to_le16(ostr.len);
456 disk_link.name = (char *)sd;
457 }
458
459 err = page_symlink(inode, disk_link.name, disk_link.len);
460
461 err_out:
462 d_instantiate(dentry, inode);
463 unlock_new_inode(inode);
464
465 /*
466 * Let's flush symlink data in order to avoid broken symlink as much as
467 * possible. Nevertheless, fsyncing is the best way, but there is no
468 * way to get a file descriptor in order to flush that.
469 *
470 * Note that, it needs to do dir->fsync to make this recoverable.
471 * If the symlink path is stored into inline_data, there is no
472 * performance regression.
473 */
474 if (!err) {
475 filemap_write_and_wait_range(inode->i_mapping, 0,
476 disk_link.len - 1);
477
478 if (IS_DIRSYNC(dir))
479 f2fs_sync_fs(sbi->sb, 1);
480 } else {
481 f2fs_unlink(dir, dentry);
482 }
483
484 kfree(sd);
485 return err;
486 out:
487 handle_failed_inode(inode);
488 return err;
489 }
490
491 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
492 {
493 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
494 struct inode *inode;
495 int err;
496
497 inode = f2fs_new_inode(dir, S_IFDIR | mode);
498 if (IS_ERR(inode))
499 return PTR_ERR(inode);
500
501 inode->i_op = &f2fs_dir_inode_operations;
502 inode->i_fop = &f2fs_dir_operations;
503 inode->i_mapping->a_ops = &f2fs_dblock_aops;
504 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
505
506 f2fs_balance_fs(sbi, true);
507
508 set_inode_flag(inode, FI_INC_LINK);
509 f2fs_lock_op(sbi);
510 err = f2fs_add_link(dentry, inode);
511 if (err)
512 goto out_fail;
513 f2fs_unlock_op(sbi);
514
515 alloc_nid_done(sbi, inode->i_ino);
516
517 d_instantiate(dentry, inode);
518 unlock_new_inode(inode);
519
520 if (IS_DIRSYNC(dir))
521 f2fs_sync_fs(sbi->sb, 1);
522 return 0;
523
524 out_fail:
525 clear_inode_flag(inode, FI_INC_LINK);
526 handle_failed_inode(inode);
527 return err;
528 }
529
530 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
531 {
532 struct inode *inode = d_inode(dentry);
533 if (f2fs_empty_dir(inode))
534 return f2fs_unlink(dir, dentry);
535 return -ENOTEMPTY;
536 }
537
538 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
539 umode_t mode, dev_t rdev)
540 {
541 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
542 struct inode *inode;
543 int err = 0;
544
545 inode = f2fs_new_inode(dir, mode);
546 if (IS_ERR(inode))
547 return PTR_ERR(inode);
548
549 init_special_inode(inode, inode->i_mode, rdev);
550 inode->i_op = &f2fs_special_inode_operations;
551
552 f2fs_balance_fs(sbi, true);
553
554 f2fs_lock_op(sbi);
555 err = f2fs_add_link(dentry, inode);
556 if (err)
557 goto out;
558 f2fs_unlock_op(sbi);
559
560 alloc_nid_done(sbi, inode->i_ino);
561
562 d_instantiate(dentry, inode);
563 unlock_new_inode(inode);
564
565 if (IS_DIRSYNC(dir))
566 f2fs_sync_fs(sbi->sb, 1);
567 return 0;
568 out:
569 handle_failed_inode(inode);
570 return err;
571 }
572
573 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
574 umode_t mode, struct inode **whiteout)
575 {
576 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
577 struct inode *inode;
578 int err;
579
580 inode = f2fs_new_inode(dir, mode);
581 if (IS_ERR(inode))
582 return PTR_ERR(inode);
583
584 if (whiteout) {
585 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
586 inode->i_op = &f2fs_special_inode_operations;
587 } else {
588 inode->i_op = &f2fs_file_inode_operations;
589 inode->i_fop = &f2fs_file_operations;
590 inode->i_mapping->a_ops = &f2fs_dblock_aops;
591 }
592
593 f2fs_balance_fs(sbi, true);
594
595 f2fs_lock_op(sbi);
596 err = acquire_orphan_inode(sbi);
597 if (err)
598 goto out;
599
600 err = f2fs_do_tmpfile(inode, dir);
601 if (err)
602 goto release_out;
603
604 /*
605 * add this non-linked tmpfile to orphan list, in this way we could
606 * remove all unused data of tmpfile after abnormal power-off.
607 */
608 add_orphan_inode(inode);
609 alloc_nid_done(sbi, inode->i_ino);
610
611 if (whiteout) {
612 f2fs_i_links_write(inode, false);
613 *whiteout = inode;
614 } else {
615 d_tmpfile(dentry, inode);
616 }
617 /* link_count was changed by d_tmpfile as well. */
618 f2fs_unlock_op(sbi);
619 unlock_new_inode(inode);
620 return 0;
621
622 release_out:
623 release_orphan_inode(sbi);
624 out:
625 handle_failed_inode(inode);
626 return err;
627 }
628
629 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
630 {
631 if (f2fs_encrypted_inode(dir)) {
632 int err = fscrypt_get_encryption_info(dir);
633 if (err)
634 return err;
635 }
636
637 return __f2fs_tmpfile(dir, dentry, mode, NULL);
638 }
639
640 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
641 {
642 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
643 }
644
645 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
646 struct inode *new_dir, struct dentry *new_dentry,
647 unsigned int flags)
648 {
649 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
650 struct inode *old_inode = d_inode(old_dentry);
651 struct inode *new_inode = d_inode(new_dentry);
652 struct inode *whiteout = NULL;
653 struct page *old_dir_page;
654 struct page *old_page, *new_page = NULL;
655 struct f2fs_dir_entry *old_dir_entry = NULL;
656 struct f2fs_dir_entry *old_entry;
657 struct f2fs_dir_entry *new_entry;
658 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
659 int err = -ENOENT;
660
661 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
662 !fscrypt_has_permitted_context(new_dir, old_inode)) {
663 err = -EPERM;
664 goto out;
665 }
666
667 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
668 if (!old_entry) {
669 if (IS_ERR(old_page))
670 err = PTR_ERR(old_page);
671 goto out;
672 }
673
674 if (S_ISDIR(old_inode->i_mode)) {
675 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
676 if (!old_dir_entry) {
677 if (IS_ERR(old_dir_page))
678 err = PTR_ERR(old_dir_page);
679 goto out_old;
680 }
681 }
682
683 if (flags & RENAME_WHITEOUT) {
684 err = f2fs_create_whiteout(old_dir, &whiteout);
685 if (err)
686 goto out_dir;
687 }
688
689 if (new_inode) {
690
691 err = -ENOTEMPTY;
692 if (old_dir_entry && !f2fs_empty_dir(new_inode))
693 goto out_whiteout;
694
695 err = -ENOENT;
696 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
697 &new_page);
698 if (!new_entry) {
699 if (IS_ERR(new_page))
700 err = PTR_ERR(new_page);
701 goto out_whiteout;
702 }
703
704 f2fs_balance_fs(sbi, true);
705
706 f2fs_lock_op(sbi);
707
708 err = acquire_orphan_inode(sbi);
709 if (err)
710 goto put_out_dir;
711
712 err = update_dent_inode(old_inode, new_inode,
713 &new_dentry->d_name);
714 if (err) {
715 release_orphan_inode(sbi);
716 goto put_out_dir;
717 }
718
719 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
720
721 new_inode->i_ctime = CURRENT_TIME;
722 down_write(&F2FS_I(new_inode)->i_sem);
723 if (old_dir_entry)
724 f2fs_i_links_write(new_inode, false);
725 f2fs_i_links_write(new_inode, false);
726 up_write(&F2FS_I(new_inode)->i_sem);
727
728 if (!new_inode->i_nlink)
729 add_orphan_inode(new_inode);
730 else
731 release_orphan_inode(sbi);
732 } else {
733 f2fs_balance_fs(sbi, true);
734
735 f2fs_lock_op(sbi);
736
737 err = f2fs_add_link(new_dentry, old_inode);
738 if (err) {
739 f2fs_unlock_op(sbi);
740 goto out_whiteout;
741 }
742
743 if (old_dir_entry)
744 f2fs_i_links_write(new_dir, true);
745
746 /*
747 * old entry and new entry can locate in the same inline
748 * dentry in inode, when attaching new entry in inline dentry,
749 * it could force inline dentry conversion, after that,
750 * old_entry and old_page will point to wrong address, in
751 * order to avoid this, let's do the check and update here.
752 */
753 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
754 f2fs_put_page(old_page, 0);
755 old_page = NULL;
756
757 old_entry = f2fs_find_entry(old_dir,
758 &old_dentry->d_name, &old_page);
759 if (!old_entry) {
760 err = -ENOENT;
761 if (IS_ERR(old_page))
762 err = PTR_ERR(old_page);
763 f2fs_unlock_op(sbi);
764 goto out_whiteout;
765 }
766 }
767 }
768
769 down_write(&F2FS_I(old_inode)->i_sem);
770 file_lost_pino(old_inode);
771 if (new_inode && file_enc_name(new_inode))
772 file_set_enc_name(old_inode);
773 up_write(&F2FS_I(old_inode)->i_sem);
774
775 old_inode->i_ctime = CURRENT_TIME;
776 f2fs_mark_inode_dirty_sync(old_inode);
777
778 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
779
780 if (whiteout) {
781 whiteout->i_state |= I_LINKABLE;
782 set_inode_flag(whiteout, FI_INC_LINK);
783 err = f2fs_add_link(old_dentry, whiteout);
784 if (err)
785 goto put_out_dir;
786 whiteout->i_state &= ~I_LINKABLE;
787 iput(whiteout);
788 }
789
790 if (old_dir_entry) {
791 if (old_dir != new_dir && !whiteout) {
792 f2fs_set_link(old_inode, old_dir_entry,
793 old_dir_page, new_dir);
794 } else {
795 f2fs_dentry_kunmap(old_inode, old_dir_page);
796 f2fs_put_page(old_dir_page, 0);
797 }
798 f2fs_i_links_write(old_dir, false);
799 }
800
801 f2fs_unlock_op(sbi);
802
803 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
804 f2fs_sync_fs(sbi->sb, 1);
805 return 0;
806
807 put_out_dir:
808 f2fs_unlock_op(sbi);
809 if (new_page) {
810 f2fs_dentry_kunmap(new_dir, new_page);
811 f2fs_put_page(new_page, 0);
812 }
813 out_whiteout:
814 if (whiteout)
815 iput(whiteout);
816 out_dir:
817 if (old_dir_entry) {
818 f2fs_dentry_kunmap(old_inode, old_dir_page);
819 f2fs_put_page(old_dir_page, 0);
820 }
821 out_old:
822 f2fs_dentry_kunmap(old_dir, old_page);
823 f2fs_put_page(old_page, 0);
824 out:
825 return err;
826 }
827
828 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
829 struct inode *new_dir, struct dentry *new_dentry)
830 {
831 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
832 struct inode *old_inode = d_inode(old_dentry);
833 struct inode *new_inode = d_inode(new_dentry);
834 struct page *old_dir_page, *new_dir_page;
835 struct page *old_page, *new_page;
836 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
837 struct f2fs_dir_entry *old_entry, *new_entry;
838 int old_nlink = 0, new_nlink = 0;
839 int err = -ENOENT;
840
841 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
842 (old_dir != new_dir) &&
843 (!fscrypt_has_permitted_context(new_dir, old_inode) ||
844 !fscrypt_has_permitted_context(old_dir, new_inode)))
845 return -EPERM;
846
847 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
848 if (!old_entry) {
849 if (IS_ERR(old_page))
850 err = PTR_ERR(old_page);
851 goto out;
852 }
853
854 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
855 if (!new_entry) {
856 if (IS_ERR(new_page))
857 err = PTR_ERR(new_page);
858 goto out_old;
859 }
860
861 /* prepare for updating ".." directory entry info later */
862 if (old_dir != new_dir) {
863 if (S_ISDIR(old_inode->i_mode)) {
864 old_dir_entry = f2fs_parent_dir(old_inode,
865 &old_dir_page);
866 if (!old_dir_entry) {
867 if (IS_ERR(old_dir_page))
868 err = PTR_ERR(old_dir_page);
869 goto out_new;
870 }
871 }
872
873 if (S_ISDIR(new_inode->i_mode)) {
874 new_dir_entry = f2fs_parent_dir(new_inode,
875 &new_dir_page);
876 if (!new_dir_entry) {
877 if (IS_ERR(new_dir_page))
878 err = PTR_ERR(new_dir_page);
879 goto out_old_dir;
880 }
881 }
882 }
883
884 /*
885 * If cross rename between file and directory those are not
886 * in the same directory, we will inc nlink of file's parent
887 * later, so we should check upper boundary of its nlink.
888 */
889 if ((!old_dir_entry || !new_dir_entry) &&
890 old_dir_entry != new_dir_entry) {
891 old_nlink = old_dir_entry ? -1 : 1;
892 new_nlink = -old_nlink;
893 err = -EMLINK;
894 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
895 (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
896 goto out_new_dir;
897 }
898
899 f2fs_balance_fs(sbi, true);
900
901 f2fs_lock_op(sbi);
902
903 err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
904 if (err)
905 goto out_unlock;
906 if (file_enc_name(new_inode))
907 file_set_enc_name(old_inode);
908
909 err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
910 if (err)
911 goto out_undo;
912 if (file_enc_name(old_inode))
913 file_set_enc_name(new_inode);
914
915 /* update ".." directory entry info of old dentry */
916 if (old_dir_entry)
917 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
918
919 /* update ".." directory entry info of new dentry */
920 if (new_dir_entry)
921 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
922
923 /* update directory entry info of old dir inode */
924 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
925
926 down_write(&F2FS_I(old_inode)->i_sem);
927 file_lost_pino(old_inode);
928 up_write(&F2FS_I(old_inode)->i_sem);
929
930 old_dir->i_ctime = CURRENT_TIME;
931 if (old_nlink) {
932 down_write(&F2FS_I(old_dir)->i_sem);
933 f2fs_i_links_write(old_dir, old_nlink > 0);
934 up_write(&F2FS_I(old_dir)->i_sem);
935 }
936 f2fs_mark_inode_dirty_sync(old_dir);
937
938 /* update directory entry info of new dir inode */
939 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
940
941 down_write(&F2FS_I(new_inode)->i_sem);
942 file_lost_pino(new_inode);
943 up_write(&F2FS_I(new_inode)->i_sem);
944
945 new_dir->i_ctime = CURRENT_TIME;
946 if (new_nlink) {
947 down_write(&F2FS_I(new_dir)->i_sem);
948 f2fs_i_links_write(new_dir, new_nlink > 0);
949 up_write(&F2FS_I(new_dir)->i_sem);
950 }
951 f2fs_mark_inode_dirty_sync(new_dir);
952
953 f2fs_unlock_op(sbi);
954
955 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
956 f2fs_sync_fs(sbi->sb, 1);
957 return 0;
958 out_undo:
959 /*
960 * Still we may fail to recover name info of f2fs_inode here
961 * Drop it, once its name is set as encrypted
962 */
963 update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
964 out_unlock:
965 f2fs_unlock_op(sbi);
966 out_new_dir:
967 if (new_dir_entry) {
968 f2fs_dentry_kunmap(new_inode, new_dir_page);
969 f2fs_put_page(new_dir_page, 0);
970 }
971 out_old_dir:
972 if (old_dir_entry) {
973 f2fs_dentry_kunmap(old_inode, old_dir_page);
974 f2fs_put_page(old_dir_page, 0);
975 }
976 out_new:
977 f2fs_dentry_kunmap(new_dir, new_page);
978 f2fs_put_page(new_page, 0);
979 out_old:
980 f2fs_dentry_kunmap(old_dir, old_page);
981 f2fs_put_page(old_page, 0);
982 out:
983 return err;
984 }
985
986 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
987 struct inode *new_dir, struct dentry *new_dentry,
988 unsigned int flags)
989 {
990 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
991 return -EINVAL;
992
993 if (flags & RENAME_EXCHANGE) {
994 return f2fs_cross_rename(old_dir, old_dentry,
995 new_dir, new_dentry);
996 }
997 /*
998 * VFS has already handled the new dentry existence case,
999 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1000 */
1001 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1002 }
1003
1004 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1005 struct inode *inode,
1006 struct delayed_call *done)
1007 {
1008 struct page *cpage = NULL;
1009 char *caddr, *paddr = NULL;
1010 struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1011 struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1012 struct fscrypt_symlink_data *sd;
1013 loff_t size = min_t(loff_t, i_size_read(inode), PAGE_SIZE - 1);
1014 u32 max_size = inode->i_sb->s_blocksize;
1015 int res;
1016
1017 if (!dentry)
1018 return ERR_PTR(-ECHILD);
1019
1020 res = fscrypt_get_encryption_info(inode);
1021 if (res)
1022 return ERR_PTR(res);
1023
1024 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1025 if (IS_ERR(cpage))
1026 return ERR_CAST(cpage);
1027 caddr = page_address(cpage);
1028 caddr[size] = 0;
1029
1030 /* Symlink is encrypted */
1031 sd = (struct fscrypt_symlink_data *)caddr;
1032 cstr.name = sd->encrypted_path;
1033 cstr.len = le16_to_cpu(sd->len);
1034
1035 /* this is broken symlink case */
1036 if (unlikely(cstr.len == 0)) {
1037 res = -ENOENT;
1038 goto errout;
1039 }
1040
1041 if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1042 /* Symlink data on the disk is corrupted */
1043 res = -EIO;
1044 goto errout;
1045 }
1046 res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1047 if (res)
1048 goto errout;
1049
1050 res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1051 if (res < 0)
1052 goto errout;
1053
1054 /* this is broken symlink case */
1055 if (unlikely(pstr.name[0] == 0)) {
1056 res = -ENOENT;
1057 goto errout;
1058 }
1059
1060 paddr = pstr.name;
1061
1062 /* Null-terminate the name */
1063 paddr[res] = '\0';
1064
1065 put_page(cpage);
1066 set_delayed_call(done, kfree_link, paddr);
1067 return paddr;
1068 errout:
1069 fscrypt_fname_free_buffer(&pstr);
1070 put_page(cpage);
1071 return ERR_PTR(res);
1072 }
1073
1074 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1075 .readlink = generic_readlink,
1076 .get_link = f2fs_encrypted_get_link,
1077 .getattr = f2fs_getattr,
1078 .setattr = f2fs_setattr,
1079 #ifdef CONFIG_F2FS_FS_XATTR
1080 .setxattr = generic_setxattr,
1081 .getxattr = generic_getxattr,
1082 .listxattr = f2fs_listxattr,
1083 .removexattr = generic_removexattr,
1084 #endif
1085 };
1086
1087 const struct inode_operations f2fs_dir_inode_operations = {
1088 .create = f2fs_create,
1089 .lookup = f2fs_lookup,
1090 .link = f2fs_link,
1091 .unlink = f2fs_unlink,
1092 .symlink = f2fs_symlink,
1093 .mkdir = f2fs_mkdir,
1094 .rmdir = f2fs_rmdir,
1095 .mknod = f2fs_mknod,
1096 .rename2 = f2fs_rename2,
1097 .tmpfile = f2fs_tmpfile,
1098 .getattr = f2fs_getattr,
1099 .setattr = f2fs_setattr,
1100 .get_acl = f2fs_get_acl,
1101 .set_acl = f2fs_set_acl,
1102 #ifdef CONFIG_F2FS_FS_XATTR
1103 .setxattr = generic_setxattr,
1104 .getxattr = generic_getxattr,
1105 .listxattr = f2fs_listxattr,
1106 .removexattr = generic_removexattr,
1107 #endif
1108 };
1109
1110 const struct inode_operations f2fs_symlink_inode_operations = {
1111 .readlink = generic_readlink,
1112 .get_link = f2fs_get_link,
1113 .getattr = f2fs_getattr,
1114 .setattr = f2fs_setattr,
1115 #ifdef CONFIG_F2FS_FS_XATTR
1116 .setxattr = generic_setxattr,
1117 .getxattr = generic_getxattr,
1118 .listxattr = f2fs_listxattr,
1119 .removexattr = generic_removexattr,
1120 #endif
1121 };
1122
1123 const struct inode_operations f2fs_special_inode_operations = {
1124 .getattr = f2fs_getattr,
1125 .setattr = f2fs_setattr,
1126 .get_acl = f2fs_get_acl,
1127 .set_acl = f2fs_set_acl,
1128 #ifdef CONFIG_F2FS_FS_XATTR
1129 .setxattr = generic_setxattr,
1130 .getxattr = generic_getxattr,
1131 .listxattr = f2fs_listxattr,
1132 .removexattr = generic_removexattr,
1133 #endif
1134 };
Linux kernel - Deliverables
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