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arm64: kgdb: Fix single-step exception handling oops
[linux/fpc-iii.git] / fs / f2fs / namei.c
blobccb99d5cfd8b044a3578edaec739b05b17657319
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(inode);
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 int i;
95
96 /*
97 * filename format of multimedia file should be defined as:
98 * "filename + '.' + extension + (optional: '.' + temp extension)".
99 */
100 if (slen < sublen + 2)
101 return 0;
102
103 for (i = 1; i < slen - sublen; i++) {
104 if (s[i] != '.')
105 continue;
106 if (!strncasecmp(s + i + 1, sub, sublen))
107 return 1;
108 }
109
110 return 0;
111 }
112
113 /*
114 * Set multimedia files as cold files for hot/cold data separation
115 */
116 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
117 const unsigned char *name)
118 {
119 int i;
120 __u8 (*extlist)[8] = sbi->raw_super->extension_list;
121
122 int count = le32_to_cpu(sbi->raw_super->extension_count);
123 for (i = 0; i < count; i++) {
124 if (is_multimedia_file(name, extlist[i])) {
125 file_set_cold(inode);
126 break;
127 }
128 }
129 }
130
131 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
132 bool excl)
133 {
134 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
135 struct inode *inode;
136 nid_t ino = 0;
137 int err;
138
139 inode = f2fs_new_inode(dir, mode);
140 if (IS_ERR(inode))
141 return PTR_ERR(inode);
142
143 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
144 set_cold_files(sbi, inode, dentry->d_name.name);
145
146 inode->i_op = &f2fs_file_inode_operations;
147 inode->i_fop = &f2fs_file_operations;
148 inode->i_mapping->a_ops = &f2fs_dblock_aops;
149 ino = inode->i_ino;
150
151 f2fs_balance_fs(sbi, true);
152
153 f2fs_lock_op(sbi);
154 err = f2fs_add_link(dentry, inode);
155 if (err)
156 goto out;
157 f2fs_unlock_op(sbi);
158
159 alloc_nid_done(sbi, ino);
160
161 d_instantiate_new(dentry, inode);
162
163 if (IS_DIRSYNC(dir))
164 f2fs_sync_fs(sbi->sb, 1);
165 return 0;
166 out:
167 handle_failed_inode(inode);
168 return err;
169 }
170
171 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
172 struct dentry *dentry)
173 {
174 struct inode *inode = d_inode(old_dentry);
175 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
176 int err;
177
178 if (f2fs_encrypted_inode(dir) &&
179 !fscrypt_has_permitted_context(dir, inode))
180 return -EPERM;
181
182 f2fs_balance_fs(sbi, true);
183
184 inode->i_ctime = current_time(inode);
185 ihold(inode);
186
187 set_inode_flag(inode, FI_INC_LINK);
188 f2fs_lock_op(sbi);
189 err = f2fs_add_link(dentry, inode);
190 if (err)
191 goto out;
192 f2fs_unlock_op(sbi);
193
194 d_instantiate(dentry, inode);
195
196 if (IS_DIRSYNC(dir))
197 f2fs_sync_fs(sbi->sb, 1);
198 return 0;
199 out:
200 clear_inode_flag(inode, FI_INC_LINK);
201 iput(inode);
202 f2fs_unlock_op(sbi);
203 return err;
204 }
205
206 struct dentry *f2fs_get_parent(struct dentry *child)
207 {
208 struct qstr dotdot = QSTR_INIT("..", 2);
209 struct page *page;
210 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
211 if (!ino) {
212 if (IS_ERR(page))
213 return ERR_CAST(page);
214 return ERR_PTR(-ENOENT);
215 }
216 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
217 }
218
219 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
220 {
221 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
222 struct qstr dot = QSTR_INIT(".", 1);
223 struct qstr dotdot = QSTR_INIT("..", 2);
224 struct f2fs_dir_entry *de;
225 struct page *page;
226 int err = 0;
227
228 if (f2fs_readonly(sbi->sb)) {
229 f2fs_msg(sbi->sb, KERN_INFO,
230 "skip recovering inline_dots inode (ino:%lu, pino:%u) "
231 "in readonly mountpoint", dir->i_ino, pino);
232 return 0;
233 }
234
235 f2fs_balance_fs(sbi, true);
236
237 f2fs_lock_op(sbi);
238
239 de = f2fs_find_entry(dir, &dot, &page);
240 if (de) {
241 f2fs_dentry_kunmap(dir, page);
242 f2fs_put_page(page, 0);
243 } else if (IS_ERR(page)) {
244 err = PTR_ERR(page);
245 goto out;
246 } else {
247 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
248 if (err)
249 goto out;
250 }
251
252 de = f2fs_find_entry(dir, &dotdot, &page);
253 if (de) {
254 f2fs_dentry_kunmap(dir, page);
255 f2fs_put_page(page, 0);
256 } else if (IS_ERR(page)) {
257 err = PTR_ERR(page);
258 } else {
259 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
260 }
261 out:
262 if (!err)
263 clear_inode_flag(dir, FI_INLINE_DOTS);
264
265 f2fs_unlock_op(sbi);
266 return err;
267 }
268
269 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
270 unsigned int flags)
271 {
272 struct inode *inode = NULL;
273 struct f2fs_dir_entry *de;
274 struct page *page;
275 nid_t ino;
276 int err = 0;
277 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
278
279 if (f2fs_encrypted_inode(dir)) {
280 int res = fscrypt_get_encryption_info(dir);
281
282 /*
283 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
284 * created while the directory was encrypted and we
285 * don't have access to the key.
286 */
287 if (fscrypt_has_encryption_key(dir))
288 fscrypt_set_encrypted_dentry(dentry);
289 fscrypt_set_d_op(dentry);
290 if (res && res != -ENOKEY)
291 return ERR_PTR(res);
292 }
293
294 if (dentry->d_name.len > F2FS_NAME_LEN)
295 return ERR_PTR(-ENAMETOOLONG);
296
297 de = f2fs_find_entry(dir, &dentry->d_name, &page);
298 if (!de) {
299 if (IS_ERR(page))
300 return (struct dentry *)page;
301 return d_splice_alias(inode, dentry);
302 }
303
304 ino = le32_to_cpu(de->ino);
305 f2fs_dentry_kunmap(dir, page);
306 f2fs_put_page(page, 0);
307
308 inode = f2fs_iget(dir->i_sb, ino);
309 if (IS_ERR(inode))
310 return ERR_CAST(inode);
311
312 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
313 err = __recover_dot_dentries(dir, root_ino);
314 if (err)
315 goto err_out;
316 }
317
318 if (f2fs_has_inline_dots(inode)) {
319 err = __recover_dot_dentries(inode, dir->i_ino);
320 if (err)
321 goto err_out;
322 }
323 if (!IS_ERR(inode) && f2fs_encrypted_inode(dir) &&
324 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
325 !fscrypt_has_permitted_context(dir, inode)) {
326 bool nokey = f2fs_encrypted_inode(inode) &&
327 !fscrypt_has_encryption_key(inode);
328 err = nokey ? -ENOKEY : -EPERM;
329 goto err_out;
330 }
331 return d_splice_alias(inode, dentry);
332
333 err_out:
334 iput(inode);
335 return ERR_PTR(err);
336 }
337
338 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
339 {
340 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
341 struct inode *inode = d_inode(dentry);
342 struct f2fs_dir_entry *de;
343 struct page *page;
344 int err = -ENOENT;
345
346 trace_f2fs_unlink_enter(dir, dentry);
347
348 de = f2fs_find_entry(dir, &dentry->d_name, &page);
349 if (!de) {
350 if (IS_ERR(page))
351 err = PTR_ERR(page);
352 goto fail;
353 }
354
355 f2fs_balance_fs(sbi, true);
356
357 f2fs_lock_op(sbi);
358 err = acquire_orphan_inode(sbi);
359 if (err) {
360 f2fs_unlock_op(sbi);
361 f2fs_dentry_kunmap(dir, page);
362 f2fs_put_page(page, 0);
363 goto fail;
364 }
365 f2fs_delete_entry(de, page, dir, inode);
366 f2fs_unlock_op(sbi);
367
368 if (IS_DIRSYNC(dir))
369 f2fs_sync_fs(sbi->sb, 1);
370 fail:
371 trace_f2fs_unlink_exit(inode, err);
372 return err;
373 }
374
375 static const char *f2fs_get_link(struct dentry *dentry,
376 struct inode *inode,
377 struct delayed_call *done)
378 {
379 const char *link = page_get_link(dentry, inode, done);
380 if (!IS_ERR(link) && !*link) {
381 /* this is broken symlink case */
382 do_delayed_call(done);
383 clear_delayed_call(done);
384 link = ERR_PTR(-ENOENT);
385 }
386 return link;
387 }
388
389 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
390 const char *symname)
391 {
392 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
393 struct inode *inode;
394 size_t len = strlen(symname);
395 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
396 struct fscrypt_symlink_data *sd = NULL;
397 int err;
398
399 if (f2fs_encrypted_inode(dir)) {
400 err = fscrypt_get_encryption_info(dir);
401 if (err)
402 return err;
403
404 if (!fscrypt_has_encryption_key(dir))
405 return -ENOKEY;
406
407 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
408 sizeof(struct fscrypt_symlink_data));
409 }
410
411 if (disk_link.len > dir->i_sb->s_blocksize)
412 return -ENAMETOOLONG;
413
414 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
415 if (IS_ERR(inode))
416 return PTR_ERR(inode);
417
418 if (f2fs_encrypted_inode(inode))
419 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
420 else
421 inode->i_op = &f2fs_symlink_inode_operations;
422 inode_nohighmem(inode);
423 inode->i_mapping->a_ops = &f2fs_dblock_aops;
424
425 f2fs_balance_fs(sbi, true);
426
427 f2fs_lock_op(sbi);
428 err = f2fs_add_link(dentry, inode);
429 if (err)
430 goto out;
431 f2fs_unlock_op(sbi);
432 alloc_nid_done(sbi, inode->i_ino);
433
434 if (f2fs_encrypted_inode(inode)) {
435 struct qstr istr = QSTR_INIT(symname, len);
436 struct fscrypt_str ostr;
437
438 sd = kzalloc(disk_link.len, GFP_NOFS);
439 if (!sd) {
440 err = -ENOMEM;
441 goto err_out;
442 }
443
444 err = fscrypt_get_encryption_info(inode);
445 if (err)
446 goto err_out;
447
448 if (!fscrypt_has_encryption_key(inode)) {
449 err = -ENOKEY;
450 goto err_out;
451 }
452
453 ostr.name = sd->encrypted_path;
454 ostr.len = disk_link.len;
455 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
456 if (err)
457 goto err_out;
458
459 sd->len = cpu_to_le16(ostr.len);
460 disk_link.name = (char *)sd;
461 }
462
463 err = page_symlink(inode, disk_link.name, disk_link.len);
464
465 err_out:
466 d_instantiate_new(dentry, inode);
467
468 /*
469 * Let's flush symlink data in order to avoid broken symlink as much as
470 * possible. Nevertheless, fsyncing is the best way, but there is no
471 * way to get a file descriptor in order to flush that.
472 *
473 * Note that, it needs to do dir->fsync to make this recoverable.
474 * If the symlink path is stored into inline_data, there is no
475 * performance regression.
476 */
477 if (!err) {
478 filemap_write_and_wait_range(inode->i_mapping, 0,
479 disk_link.len - 1);
480
481 if (IS_DIRSYNC(dir))
482 f2fs_sync_fs(sbi->sb, 1);
483 } else {
484 f2fs_unlink(dir, dentry);
485 }
486
487 kfree(sd);
488 return err;
489 out:
490 handle_failed_inode(inode);
491 return err;
492 }
493
494 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
495 {
496 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
497 struct inode *inode;
498 int err;
499
500 inode = f2fs_new_inode(dir, S_IFDIR | mode);
501 if (IS_ERR(inode))
502 return PTR_ERR(inode);
503
504 inode->i_op = &f2fs_dir_inode_operations;
505 inode->i_fop = &f2fs_dir_operations;
506 inode->i_mapping->a_ops = &f2fs_dblock_aops;
507 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
508
509 f2fs_balance_fs(sbi, true);
510
511 set_inode_flag(inode, FI_INC_LINK);
512 f2fs_lock_op(sbi);
513 err = f2fs_add_link(dentry, inode);
514 if (err)
515 goto out_fail;
516 f2fs_unlock_op(sbi);
517
518 alloc_nid_done(sbi, inode->i_ino);
519
520 d_instantiate_new(dentry, inode);
521
522 if (IS_DIRSYNC(dir))
523 f2fs_sync_fs(sbi->sb, 1);
524 return 0;
525
526 out_fail:
527 clear_inode_flag(inode, FI_INC_LINK);
528 handle_failed_inode(inode);
529 return err;
530 }
531
532 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
533 {
534 struct inode *inode = d_inode(dentry);
535 if (f2fs_empty_dir(inode))
536 return f2fs_unlink(dir, dentry);
537 return -ENOTEMPTY;
538 }
539
540 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
541 umode_t mode, dev_t rdev)
542 {
543 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
544 struct inode *inode;
545 int err = 0;
546
547 inode = f2fs_new_inode(dir, mode);
548 if (IS_ERR(inode))
549 return PTR_ERR(inode);
550
551 init_special_inode(inode, inode->i_mode, rdev);
552 inode->i_op = &f2fs_special_inode_operations;
553
554 f2fs_balance_fs(sbi, true);
555
556 f2fs_lock_op(sbi);
557 err = f2fs_add_link(dentry, inode);
558 if (err)
559 goto out;
560 f2fs_unlock_op(sbi);
561
562 alloc_nid_done(sbi, inode->i_ino);
563
564 d_instantiate_new(dentry, inode);
565
566 if (IS_DIRSYNC(dir))
567 f2fs_sync_fs(sbi->sb, 1);
568 return 0;
569 out:
570 handle_failed_inode(inode);
571 return err;
572 }
573
574 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
575 umode_t mode, struct inode **whiteout)
576 {
577 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
578 struct inode *inode;
579 int err;
580
581 inode = f2fs_new_inode(dir, mode);
582 if (IS_ERR(inode))
583 return PTR_ERR(inode);
584
585 if (whiteout) {
586 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
587 inode->i_op = &f2fs_special_inode_operations;
588 } else {
589 inode->i_op = &f2fs_file_inode_operations;
590 inode->i_fop = &f2fs_file_operations;
591 inode->i_mapping->a_ops = &f2fs_dblock_aops;
592 }
593
594 f2fs_balance_fs(sbi, true);
595
596 f2fs_lock_op(sbi);
597 err = acquire_orphan_inode(sbi);
598 if (err)
599 goto out;
600
601 err = f2fs_do_tmpfile(inode, dir);
602 if (err)
603 goto release_out;
604
605 /*
606 * add this non-linked tmpfile to orphan list, in this way we could
607 * remove all unused data of tmpfile after abnormal power-off.
608 */
609 add_orphan_inode(inode);
610 alloc_nid_done(sbi, inode->i_ino);
611
612 if (whiteout) {
613 f2fs_i_links_write(inode, false);
614 *whiteout = inode;
615 } else {
616 d_tmpfile(dentry, inode);
617 }
618 /* link_count was changed by d_tmpfile as well. */
619 f2fs_unlock_op(sbi);
620 unlock_new_inode(inode);
621 return 0;
622
623 release_out:
624 release_orphan_inode(sbi);
625 out:
626 handle_failed_inode(inode);
627 return err;
628 }
629
630 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
631 {
632 if (f2fs_encrypted_inode(dir)) {
633 int err = fscrypt_get_encryption_info(dir);
634 if (err)
635 return err;
636 }
637
638 return __f2fs_tmpfile(dir, dentry, mode, NULL);
639 }
640
641 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
642 {
643 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
644 }
645
646 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
647 struct inode *new_dir, struct dentry *new_dentry,
648 unsigned int flags)
649 {
650 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
651 struct inode *old_inode = d_inode(old_dentry);
652 struct inode *new_inode = d_inode(new_dentry);
653 struct inode *whiteout = NULL;
654 struct page *old_dir_page;
655 struct page *old_page, *new_page = NULL;
656 struct f2fs_dir_entry *old_dir_entry = NULL;
657 struct f2fs_dir_entry *old_entry;
658 struct f2fs_dir_entry *new_entry;
659 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
660 int err = -ENOENT;
661
662 if ((f2fs_encrypted_inode(old_dir) &&
663 !fscrypt_has_encryption_key(old_dir)) ||
664 (f2fs_encrypted_inode(new_dir) &&
665 !fscrypt_has_encryption_key(new_dir)))
666 return -ENOKEY;
667
668 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
669 !fscrypt_has_permitted_context(new_dir, old_inode)) {
670 err = -EPERM;
671 goto out;
672 }
673
674 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
675 if (!old_entry) {
676 if (IS_ERR(old_page))
677 err = PTR_ERR(old_page);
678 goto out;
679 }
680
681 if (S_ISDIR(old_inode->i_mode)) {
682 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
683 if (!old_dir_entry) {
684 if (IS_ERR(old_dir_page))
685 err = PTR_ERR(old_dir_page);
686 goto out_old;
687 }
688 }
689
690 if (flags & RENAME_WHITEOUT) {
691 err = f2fs_create_whiteout(old_dir, &whiteout);
692 if (err)
693 goto out_dir;
694 }
695
696 if (new_inode) {
697
698 err = -ENOTEMPTY;
699 if (old_dir_entry && !f2fs_empty_dir(new_inode))
700 goto out_whiteout;
701
702 err = -ENOENT;
703 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
704 &new_page);
705 if (!new_entry) {
706 if (IS_ERR(new_page))
707 err = PTR_ERR(new_page);
708 goto out_whiteout;
709 }
710
711 f2fs_balance_fs(sbi, true);
712
713 f2fs_lock_op(sbi);
714
715 err = acquire_orphan_inode(sbi);
716 if (err)
717 goto put_out_dir;
718
719 err = update_dent_inode(old_inode, new_inode,
720 &new_dentry->d_name);
721 if (err) {
722 release_orphan_inode(sbi);
723 goto put_out_dir;
724 }
725
726 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
727
728 new_inode->i_ctime = current_time(new_inode);
729 down_write(&F2FS_I(new_inode)->i_sem);
730 if (old_dir_entry)
731 f2fs_i_links_write(new_inode, false);
732 f2fs_i_links_write(new_inode, false);
733 up_write(&F2FS_I(new_inode)->i_sem);
734
735 if (!new_inode->i_nlink)
736 add_orphan_inode(new_inode);
737 else
738 release_orphan_inode(sbi);
739 } else {
740 f2fs_balance_fs(sbi, true);
741
742 f2fs_lock_op(sbi);
743
744 err = f2fs_add_link(new_dentry, old_inode);
745 if (err) {
746 f2fs_unlock_op(sbi);
747 goto out_whiteout;
748 }
749
750 if (old_dir_entry)
751 f2fs_i_links_write(new_dir, true);
752
753 /*
754 * old entry and new entry can locate in the same inline
755 * dentry in inode, when attaching new entry in inline dentry,
756 * it could force inline dentry conversion, after that,
757 * old_entry and old_page will point to wrong address, in
758 * order to avoid this, let's do the check and update here.
759 */
760 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
761 f2fs_put_page(old_page, 0);
762 old_page = NULL;
763
764 old_entry = f2fs_find_entry(old_dir,
765 &old_dentry->d_name, &old_page);
766 if (!old_entry) {
767 err = -ENOENT;
768 if (IS_ERR(old_page))
769 err = PTR_ERR(old_page);
770 f2fs_unlock_op(sbi);
771 goto out_whiteout;
772 }
773 }
774 }
775
776 down_write(&F2FS_I(old_inode)->i_sem);
777 file_lost_pino(old_inode);
778 if (new_inode && file_enc_name(new_inode))
779 file_set_enc_name(old_inode);
780 up_write(&F2FS_I(old_inode)->i_sem);
781
782 old_inode->i_ctime = current_time(old_inode);
783 f2fs_mark_inode_dirty_sync(old_inode);
784
785 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
786
787 if (whiteout) {
788 whiteout->i_state |= I_LINKABLE;
789 set_inode_flag(whiteout, FI_INC_LINK);
790 err = f2fs_add_link(old_dentry, whiteout);
791 if (err)
792 goto put_out_dir;
793 whiteout->i_state &= ~I_LINKABLE;
794 iput(whiteout);
795 }
796
797 if (old_dir_entry) {
798 if (old_dir != new_dir && !whiteout) {
799 f2fs_set_link(old_inode, old_dir_entry,
800 old_dir_page, new_dir);
801 } else {
802 f2fs_dentry_kunmap(old_inode, old_dir_page);
803 f2fs_put_page(old_dir_page, 0);
804 }
805 f2fs_i_links_write(old_dir, false);
806 }
807
808 f2fs_unlock_op(sbi);
809
810 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
811 f2fs_sync_fs(sbi->sb, 1);
812 return 0;
813
814 put_out_dir:
815 f2fs_unlock_op(sbi);
816 if (new_page) {
817 f2fs_dentry_kunmap(new_dir, new_page);
818 f2fs_put_page(new_page, 0);
819 }
820 out_whiteout:
821 if (whiteout)
822 iput(whiteout);
823 out_dir:
824 if (old_dir_entry) {
825 f2fs_dentry_kunmap(old_inode, old_dir_page);
826 f2fs_put_page(old_dir_page, 0);
827 }
828 out_old:
829 f2fs_dentry_kunmap(old_dir, old_page);
830 f2fs_put_page(old_page, 0);
831 out:
832 return err;
833 }
834
835 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
836 struct inode *new_dir, struct dentry *new_dentry)
837 {
838 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
839 struct inode *old_inode = d_inode(old_dentry);
840 struct inode *new_inode = d_inode(new_dentry);
841 struct page *old_dir_page, *new_dir_page;
842 struct page *old_page, *new_page;
843 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
844 struct f2fs_dir_entry *old_entry, *new_entry;
845 int old_nlink = 0, new_nlink = 0;
846 int err = -ENOENT;
847
848 if ((f2fs_encrypted_inode(old_dir) &&
849 !fscrypt_has_encryption_key(old_dir)) ||
850 (f2fs_encrypted_inode(new_dir) &&
851 !fscrypt_has_encryption_key(new_dir)))
852 return -ENOKEY;
853
854 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
855 (old_dir != new_dir) &&
856 (!fscrypt_has_permitted_context(new_dir, old_inode) ||
857 !fscrypt_has_permitted_context(old_dir, new_inode)))
858 return -EPERM;
859
860 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
861 if (!old_entry) {
862 if (IS_ERR(old_page))
863 err = PTR_ERR(old_page);
864 goto out;
865 }
866
867 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
868 if (!new_entry) {
869 if (IS_ERR(new_page))
870 err = PTR_ERR(new_page);
871 goto out_old;
872 }
873
874 /* prepare for updating ".." directory entry info later */
875 if (old_dir != new_dir) {
876 if (S_ISDIR(old_inode->i_mode)) {
877 old_dir_entry = f2fs_parent_dir(old_inode,
878 &old_dir_page);
879 if (!old_dir_entry) {
880 if (IS_ERR(old_dir_page))
881 err = PTR_ERR(old_dir_page);
882 goto out_new;
883 }
884 }
885
886 if (S_ISDIR(new_inode->i_mode)) {
887 new_dir_entry = f2fs_parent_dir(new_inode,
888 &new_dir_page);
889 if (!new_dir_entry) {
890 if (IS_ERR(new_dir_page))
891 err = PTR_ERR(new_dir_page);
892 goto out_old_dir;
893 }
894 }
895 }
896
897 /*
898 * If cross rename between file and directory those are not
899 * in the same directory, we will inc nlink of file's parent
900 * later, so we should check upper boundary of its nlink.
901 */
902 if ((!old_dir_entry || !new_dir_entry) &&
903 old_dir_entry != new_dir_entry) {
904 old_nlink = old_dir_entry ? -1 : 1;
905 new_nlink = -old_nlink;
906 err = -EMLINK;
907 if ((old_nlink > 0 && old_inode->i_nlink >= F2FS_LINK_MAX) ||
908 (new_nlink > 0 && new_inode->i_nlink >= F2FS_LINK_MAX))
909 goto out_new_dir;
910 }
911
912 f2fs_balance_fs(sbi, true);
913
914 f2fs_lock_op(sbi);
915
916 err = update_dent_inode(old_inode, new_inode, &new_dentry->d_name);
917 if (err)
918 goto out_unlock;
919 if (file_enc_name(new_inode))
920 file_set_enc_name(old_inode);
921
922 err = update_dent_inode(new_inode, old_inode, &old_dentry->d_name);
923 if (err)
924 goto out_undo;
925 if (file_enc_name(old_inode))
926 file_set_enc_name(new_inode);
927
928 /* update ".." directory entry info of old dentry */
929 if (old_dir_entry)
930 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
931
932 /* update ".." directory entry info of new dentry */
933 if (new_dir_entry)
934 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
935
936 /* update directory entry info of old dir inode */
937 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
938
939 down_write(&F2FS_I(old_inode)->i_sem);
940 file_lost_pino(old_inode);
941 up_write(&F2FS_I(old_inode)->i_sem);
942
943 old_dir->i_ctime = current_time(old_dir);
944 if (old_nlink) {
945 down_write(&F2FS_I(old_dir)->i_sem);
946 f2fs_i_links_write(old_dir, old_nlink > 0);
947 up_write(&F2FS_I(old_dir)->i_sem);
948 }
949 f2fs_mark_inode_dirty_sync(old_dir);
950
951 /* update directory entry info of new dir inode */
952 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
953
954 down_write(&F2FS_I(new_inode)->i_sem);
955 file_lost_pino(new_inode);
956 up_write(&F2FS_I(new_inode)->i_sem);
957
958 new_dir->i_ctime = current_time(new_dir);
959 if (new_nlink) {
960 down_write(&F2FS_I(new_dir)->i_sem);
961 f2fs_i_links_write(new_dir, new_nlink > 0);
962 up_write(&F2FS_I(new_dir)->i_sem);
963 }
964 f2fs_mark_inode_dirty_sync(new_dir);
965
966 f2fs_unlock_op(sbi);
967
968 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
969 f2fs_sync_fs(sbi->sb, 1);
970 return 0;
971 out_undo:
972 /*
973 * Still we may fail to recover name info of f2fs_inode here
974 * Drop it, once its name is set as encrypted
975 */
976 update_dent_inode(old_inode, old_inode, &old_dentry->d_name);
977 out_unlock:
978 f2fs_unlock_op(sbi);
979 out_new_dir:
980 if (new_dir_entry) {
981 f2fs_dentry_kunmap(new_inode, new_dir_page);
982 f2fs_put_page(new_dir_page, 0);
983 }
984 out_old_dir:
985 if (old_dir_entry) {
986 f2fs_dentry_kunmap(old_inode, old_dir_page);
987 f2fs_put_page(old_dir_page, 0);
988 }
989 out_new:
990 f2fs_dentry_kunmap(new_dir, new_page);
991 f2fs_put_page(new_page, 0);
992 out_old:
993 f2fs_dentry_kunmap(old_dir, old_page);
994 f2fs_put_page(old_page, 0);
995 out:
996 return err;
997 }
998
999 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1000 struct inode *new_dir, struct dentry *new_dentry,
1001 unsigned int flags)
1002 {
1003 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1004 return -EINVAL;
1005
1006 if (flags & RENAME_EXCHANGE) {
1007 return f2fs_cross_rename(old_dir, old_dentry,
1008 new_dir, new_dentry);
1009 }
1010 /*
1011 * VFS has already handled the new dentry existence case,
1012 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1013 */
1014 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1015 }
1016
1017 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1018 struct inode *inode,
1019 struct delayed_call *done)
1020 {
1021 struct page *cpage = NULL;
1022 char *caddr, *paddr = NULL;
1023 struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1024 struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1025 struct fscrypt_symlink_data *sd;
1026 u32 max_size = inode->i_sb->s_blocksize;
1027 int res;
1028
1029 if (!dentry)
1030 return ERR_PTR(-ECHILD);
1031
1032 res = fscrypt_get_encryption_info(inode);
1033 if (res)
1034 return ERR_PTR(res);
1035
1036 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1037 if (IS_ERR(cpage))
1038 return ERR_CAST(cpage);
1039 caddr = page_address(cpage);
1040
1041 /* Symlink is encrypted */
1042 sd = (struct fscrypt_symlink_data *)caddr;
1043 cstr.name = sd->encrypted_path;
1044 cstr.len = le16_to_cpu(sd->len);
1045
1046 /* this is broken symlink case */
1047 if (unlikely(cstr.len == 0)) {
1048 res = -ENOENT;
1049 goto errout;
1050 }
1051
1052 if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1053 /* Symlink data on the disk is corrupted */
1054 res = -EIO;
1055 goto errout;
1056 }
1057 res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1058 if (res)
1059 goto errout;
1060
1061 res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1062 if (res)
1063 goto errout;
1064
1065 /* this is broken symlink case */
1066 if (unlikely(pstr.name[0] == 0)) {
1067 res = -ENOENT;
1068 goto errout;
1069 }
1070
1071 paddr = pstr.name;
1072
1073 /* Null-terminate the name */
1074 paddr[pstr.len] = '\0';
1075
1076 put_page(cpage);
1077 set_delayed_call(done, kfree_link, paddr);
1078 return paddr;
1079 errout:
1080 fscrypt_fname_free_buffer(&pstr);
1081 put_page(cpage);
1082 return ERR_PTR(res);
1083 }
1084
1085 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1086 .readlink = generic_readlink,
1087 .get_link = f2fs_encrypted_get_link,
1088 .getattr = f2fs_getattr,
1089 .setattr = f2fs_setattr,
1090 #ifdef CONFIG_F2FS_FS_XATTR
1091 .listxattr = f2fs_listxattr,
1092 #endif
1093 };
1094
1095 const struct inode_operations f2fs_dir_inode_operations = {
1096 .create = f2fs_create,
1097 .lookup = f2fs_lookup,
1098 .link = f2fs_link,
1099 .unlink = f2fs_unlink,
1100 .symlink = f2fs_symlink,
1101 .mkdir = f2fs_mkdir,
1102 .rmdir = f2fs_rmdir,
1103 .mknod = f2fs_mknod,
1104 .rename = f2fs_rename2,
1105 .tmpfile = f2fs_tmpfile,
1106 .getattr = f2fs_getattr,
1107 .setattr = f2fs_setattr,
1108 .get_acl = f2fs_get_acl,
1109 .set_acl = f2fs_set_acl,
1110 #ifdef CONFIG_F2FS_FS_XATTR
1111 .listxattr = f2fs_listxattr,
1112 #endif
1113 };
1114
1115 const struct inode_operations f2fs_symlink_inode_operations = {
1116 .readlink = generic_readlink,
1117 .get_link = f2fs_get_link,
1118 .getattr = f2fs_getattr,
1119 .setattr = f2fs_setattr,
1120 #ifdef CONFIG_F2FS_FS_XATTR
1121 .listxattr = f2fs_listxattr,
1122 #endif
1123 };
1124
1125 const struct inode_operations f2fs_special_inode_operations = {
1126 .getattr = f2fs_getattr,
1127 .setattr = f2fs_setattr,
1128 .get_acl = f2fs_get_acl,
1129 .set_acl = f2fs_set_acl,
1130 #ifdef CONFIG_F2FS_FS_XATTR
1131 .listxattr = f2fs_listxattr,
1132 #endif
1133 };
Linux with added FPC-III support