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Merge branch 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[mirror_ubuntu-bionic-kernel.git] / fs / f2fs / namei.c
1 /*
2 * fs/f2fs/namei.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11 #include <linux/fs.h>
12 #include <linux/f2fs_fs.h>
13 #include <linux/pagemap.h>
14 #include <linux/sched.h>
15 #include <linux/ctype.h>
16 #include <linux/dcache.h>
17 #include <linux/namei.h>
18 #include <linux/quotaops.h>
19
20 #include "f2fs.h"
21 #include "node.h"
22 #include "xattr.h"
23 #include "acl.h"
24 #include <trace/events/f2fs.h>
25
26 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
27 {
28 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
29 nid_t ino;
30 struct inode *inode;
31 bool nid_free = false;
32 int xattr_size = 0;
33 int err;
34
35 inode = new_inode(dir->i_sb);
36 if (!inode)
37 return ERR_PTR(-ENOMEM);
38
39 f2fs_lock_op(sbi);
40 if (!alloc_nid(sbi, &ino)) {
41 f2fs_unlock_op(sbi);
42 err = -ENOSPC;
43 goto fail;
44 }
45 f2fs_unlock_op(sbi);
46
47 nid_free = true;
48
49 inode_init_owner(inode, dir, mode);
50
51 inode->i_ino = ino;
52 inode->i_blocks = 0;
53 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
54 inode->i_generation = sbi->s_next_generation++;
55
56 err = insert_inode_locked(inode);
57 if (err) {
58 err = -EINVAL;
59 goto fail;
60 }
61
62 if (f2fs_sb_has_project_quota(sbi->sb) &&
63 (F2FS_I(dir)->i_flags & FS_PROJINHERIT_FL))
64 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
65 else
66 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
67 F2FS_DEF_PROJID);
68
69 err = dquot_initialize(inode);
70 if (err)
71 goto fail_drop;
72
73 err = dquot_alloc_inode(inode);
74 if (err)
75 goto fail_drop;
76
77 /* If the directory encrypted, then we should encrypt the inode. */
78 if (f2fs_encrypted_inode(dir) && f2fs_may_encrypt(inode))
79 f2fs_set_encrypted_inode(inode);
80
81 set_inode_flag(inode, FI_NEW_INODE);
82
83 if (f2fs_sb_has_extra_attr(sbi->sb)) {
84 set_inode_flag(inode, FI_EXTRA_ATTR);
85 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
86 }
87
88 if (test_opt(sbi, INLINE_XATTR))
89 set_inode_flag(inode, FI_INLINE_XATTR);
90
91 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
92 set_inode_flag(inode, FI_INLINE_DATA);
93 if (f2fs_may_inline_dentry(inode))
94 set_inode_flag(inode, FI_INLINE_DENTRY);
95
96 if (f2fs_sb_has_flexible_inline_xattr(sbi->sb)) {
97 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
98 if (f2fs_has_inline_xattr(inode))
99 xattr_size = sbi->inline_xattr_size;
100 /* Otherwise, will be 0 */
101 } else if (f2fs_has_inline_xattr(inode) ||
102 f2fs_has_inline_dentry(inode)) {
103 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
104 }
105 F2FS_I(inode)->i_inline_xattr_size = xattr_size;
106
107 f2fs_init_extent_tree(inode, NULL);
108
109 stat_inc_inline_xattr(inode);
110 stat_inc_inline_inode(inode);
111 stat_inc_inline_dir(inode);
112
113 F2FS_I(inode)->i_flags =
114 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
115
116 if (S_ISDIR(inode->i_mode))
117 F2FS_I(inode)->i_flags |= FS_INDEX_FL;
118
119 if (F2FS_I(inode)->i_flags & FS_PROJINHERIT_FL)
120 set_inode_flag(inode, FI_PROJ_INHERIT);
121
122 trace_f2fs_new_inode(inode, 0);
123 return inode;
124
125 fail:
126 trace_f2fs_new_inode(inode, err);
127 make_bad_inode(inode);
128 if (nid_free)
129 set_inode_flag(inode, FI_FREE_NID);
130 iput(inode);
131 return ERR_PTR(err);
132 fail_drop:
133 trace_f2fs_new_inode(inode, err);
134 dquot_drop(inode);
135 inode->i_flags |= S_NOQUOTA;
136 if (nid_free)
137 set_inode_flag(inode, FI_FREE_NID);
138 clear_nlink(inode);
139 unlock_new_inode(inode);
140 iput(inode);
141 return ERR_PTR(err);
142 }
143
144 static int is_multimedia_file(const unsigned char *s, const char *sub)
145 {
146 size_t slen = strlen(s);
147 size_t sublen = strlen(sub);
148 int i;
149
150 /*
151 * filename format of multimedia file should be defined as:
152 * "filename + '.' + extension + (optional: '.' + temp extension)".
153 */
154 if (slen < sublen + 2)
155 return 0;
156
157 for (i = 1; i < slen - sublen; i++) {
158 if (s[i] != '.')
159 continue;
160 if (!strncasecmp(s + i + 1, sub, sublen))
161 return 1;
162 }
163
164 return 0;
165 }
166
167 /*
168 * Set multimedia files as cold files for hot/cold data separation
169 */
170 static inline void set_cold_files(struct f2fs_sb_info *sbi, struct inode *inode,
171 const unsigned char *name)
172 {
173 int i;
174 __u8 (*extlist)[8] = sbi->raw_super->extension_list;
175
176 int count = le32_to_cpu(sbi->raw_super->extension_count);
177 for (i = 0; i < count; i++) {
178 if (is_multimedia_file(name, extlist[i])) {
179 file_set_cold(inode);
180 break;
181 }
182 }
183 }
184
185 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
186 bool excl)
187 {
188 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
189 struct inode *inode;
190 nid_t ino = 0;
191 int err;
192
193 if (unlikely(f2fs_cp_error(sbi)))
194 return -EIO;
195
196 err = dquot_initialize(dir);
197 if (err)
198 return err;
199
200 inode = f2fs_new_inode(dir, mode);
201 if (IS_ERR(inode))
202 return PTR_ERR(inode);
203
204 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
205 set_cold_files(sbi, inode, dentry->d_name.name);
206
207 inode->i_op = &f2fs_file_inode_operations;
208 inode->i_fop = &f2fs_file_operations;
209 inode->i_mapping->a_ops = &f2fs_dblock_aops;
210 ino = inode->i_ino;
211
212 f2fs_lock_op(sbi);
213 err = f2fs_add_link(dentry, inode);
214 if (err)
215 goto out;
216 f2fs_unlock_op(sbi);
217
218 alloc_nid_done(sbi, ino);
219
220 d_instantiate(dentry, inode);
221 unlock_new_inode(inode);
222
223 if (IS_DIRSYNC(dir))
224 f2fs_sync_fs(sbi->sb, 1);
225
226 f2fs_balance_fs(sbi, true);
227 return 0;
228 out:
229 handle_failed_inode(inode);
230 return err;
231 }
232
233 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
234 struct dentry *dentry)
235 {
236 struct inode *inode = d_inode(old_dentry);
237 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
238 int err;
239
240 if (unlikely(f2fs_cp_error(sbi)))
241 return -EIO;
242
243 if (f2fs_encrypted_inode(dir) &&
244 !fscrypt_has_permitted_context(dir, inode))
245 return -EPERM;
246
247 if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
248 (!projid_eq(F2FS_I(dir)->i_projid,
249 F2FS_I(old_dentry->d_inode)->i_projid)))
250 return -EXDEV;
251
252 err = dquot_initialize(dir);
253 if (err)
254 return err;
255
256 f2fs_balance_fs(sbi, true);
257
258 inode->i_ctime = current_time(inode);
259 ihold(inode);
260
261 set_inode_flag(inode, FI_INC_LINK);
262 f2fs_lock_op(sbi);
263 err = f2fs_add_link(dentry, inode);
264 if (err)
265 goto out;
266 f2fs_unlock_op(sbi);
267
268 d_instantiate(dentry, inode);
269
270 if (IS_DIRSYNC(dir))
271 f2fs_sync_fs(sbi->sb, 1);
272 return 0;
273 out:
274 clear_inode_flag(inode, FI_INC_LINK);
275 iput(inode);
276 f2fs_unlock_op(sbi);
277 return err;
278 }
279
280 struct dentry *f2fs_get_parent(struct dentry *child)
281 {
282 struct qstr dotdot = QSTR_INIT("..", 2);
283 struct page *page;
284 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
285 if (!ino) {
286 if (IS_ERR(page))
287 return ERR_CAST(page);
288 return ERR_PTR(-ENOENT);
289 }
290 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
291 }
292
293 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
294 {
295 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
296 struct qstr dot = QSTR_INIT(".", 1);
297 struct qstr dotdot = QSTR_INIT("..", 2);
298 struct f2fs_dir_entry *de;
299 struct page *page;
300 int err = 0;
301
302 if (f2fs_readonly(sbi->sb)) {
303 f2fs_msg(sbi->sb, KERN_INFO,
304 "skip recovering inline_dots inode (ino:%lu, pino:%u) "
305 "in readonly mountpoint", dir->i_ino, pino);
306 return 0;
307 }
308
309 err = dquot_initialize(dir);
310 if (err)
311 return err;
312
313 f2fs_balance_fs(sbi, true);
314
315 f2fs_lock_op(sbi);
316
317 de = f2fs_find_entry(dir, &dot, &page);
318 if (de) {
319 f2fs_dentry_kunmap(dir, page);
320 f2fs_put_page(page, 0);
321 } else if (IS_ERR(page)) {
322 err = PTR_ERR(page);
323 goto out;
324 } else {
325 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
326 if (err)
327 goto out;
328 }
329
330 de = f2fs_find_entry(dir, &dotdot, &page);
331 if (de) {
332 f2fs_dentry_kunmap(dir, page);
333 f2fs_put_page(page, 0);
334 } else if (IS_ERR(page)) {
335 err = PTR_ERR(page);
336 } else {
337 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
338 }
339 out:
340 if (!err)
341 clear_inode_flag(dir, FI_INLINE_DOTS);
342
343 f2fs_unlock_op(sbi);
344 return err;
345 }
346
347 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
348 unsigned int flags)
349 {
350 struct inode *inode = NULL;
351 struct f2fs_dir_entry *de;
352 struct page *page;
353 struct dentry *new;
354 nid_t ino = -1;
355 int err = 0;
356 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
357
358 trace_f2fs_lookup_start(dir, dentry, flags);
359
360 if (f2fs_encrypted_inode(dir)) {
361 err = fscrypt_get_encryption_info(dir);
362
363 /*
364 * DCACHE_ENCRYPTED_WITH_KEY is set if the dentry is
365 * created while the directory was encrypted and we
366 * don't have access to the key.
367 */
368 if (fscrypt_has_encryption_key(dir))
369 fscrypt_set_encrypted_dentry(dentry);
370 fscrypt_set_d_op(dentry);
371 if (err && err != -ENOKEY)
372 goto out;
373 }
374
375 if (dentry->d_name.len > F2FS_NAME_LEN) {
376 err = -ENAMETOOLONG;
377 goto out;
378 }
379
380 de = f2fs_find_entry(dir, &dentry->d_name, &page);
381 if (!de) {
382 if (IS_ERR(page)) {
383 err = PTR_ERR(page);
384 goto out;
385 }
386 goto out_splice;
387 }
388
389 ino = le32_to_cpu(de->ino);
390 f2fs_dentry_kunmap(dir, page);
391 f2fs_put_page(page, 0);
392
393 inode = f2fs_iget(dir->i_sb, ino);
394 if (IS_ERR(inode)) {
395 err = PTR_ERR(inode);
396 goto out;
397 }
398
399 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
400 err = __recover_dot_dentries(dir, root_ino);
401 if (err)
402 goto out_iput;
403 }
404
405 if (f2fs_has_inline_dots(inode)) {
406 err = __recover_dot_dentries(inode, dir->i_ino);
407 if (err)
408 goto out_iput;
409 }
410 if (f2fs_encrypted_inode(dir) &&
411 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
412 !fscrypt_has_permitted_context(dir, inode)) {
413 f2fs_msg(inode->i_sb, KERN_WARNING,
414 "Inconsistent encryption contexts: %lu/%lu",
415 dir->i_ino, inode->i_ino);
416 err = -EPERM;
417 goto out_iput;
418 }
419 out_splice:
420 new = d_splice_alias(inode, dentry);
421 if (IS_ERR(new))
422 err = PTR_ERR(new);
423 trace_f2fs_lookup_end(dir, dentry, ino, err);
424 return new;
425 out_iput:
426 iput(inode);
427 out:
428 trace_f2fs_lookup_end(dir, dentry, ino, err);
429 return ERR_PTR(err);
430 }
431
432 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
433 {
434 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
435 struct inode *inode = d_inode(dentry);
436 struct f2fs_dir_entry *de;
437 struct page *page;
438 int err = -ENOENT;
439
440 trace_f2fs_unlink_enter(dir, dentry);
441
442 if (unlikely(f2fs_cp_error(sbi)))
443 return -EIO;
444
445 err = dquot_initialize(dir);
446 if (err)
447 return err;
448 err = dquot_initialize(inode);
449 if (err)
450 return err;
451
452 de = f2fs_find_entry(dir, &dentry->d_name, &page);
453 if (!de) {
454 if (IS_ERR(page))
455 err = PTR_ERR(page);
456 goto fail;
457 }
458
459 f2fs_balance_fs(sbi, true);
460
461 f2fs_lock_op(sbi);
462 err = acquire_orphan_inode(sbi);
463 if (err) {
464 f2fs_unlock_op(sbi);
465 f2fs_dentry_kunmap(dir, page);
466 f2fs_put_page(page, 0);
467 goto fail;
468 }
469 f2fs_delete_entry(de, page, dir, inode);
470 f2fs_unlock_op(sbi);
471
472 if (IS_DIRSYNC(dir))
473 f2fs_sync_fs(sbi->sb, 1);
474 fail:
475 trace_f2fs_unlink_exit(inode, err);
476 return err;
477 }
478
479 static const char *f2fs_get_link(struct dentry *dentry,
480 struct inode *inode,
481 struct delayed_call *done)
482 {
483 const char *link = page_get_link(dentry, inode, done);
484 if (!IS_ERR(link) && !*link) {
485 /* this is broken symlink case */
486 do_delayed_call(done);
487 clear_delayed_call(done);
488 link = ERR_PTR(-ENOENT);
489 }
490 return link;
491 }
492
493 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
494 const char *symname)
495 {
496 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
497 struct inode *inode;
498 size_t len = strlen(symname);
499 struct fscrypt_str disk_link = FSTR_INIT((char *)symname, len + 1);
500 struct fscrypt_symlink_data *sd = NULL;
501 int err;
502
503 if (unlikely(f2fs_cp_error(sbi)))
504 return -EIO;
505
506 if (f2fs_encrypted_inode(dir)) {
507 err = fscrypt_get_encryption_info(dir);
508 if (err)
509 return err;
510
511 if (!fscrypt_has_encryption_key(dir))
512 return -ENOKEY;
513
514 disk_link.len = (fscrypt_fname_encrypted_size(dir, len) +
515 sizeof(struct fscrypt_symlink_data));
516 }
517
518 if (disk_link.len > dir->i_sb->s_blocksize)
519 return -ENAMETOOLONG;
520
521 err = dquot_initialize(dir);
522 if (err)
523 return err;
524
525 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
526 if (IS_ERR(inode))
527 return PTR_ERR(inode);
528
529 if (f2fs_encrypted_inode(inode))
530 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
531 else
532 inode->i_op = &f2fs_symlink_inode_operations;
533 inode_nohighmem(inode);
534 inode->i_mapping->a_ops = &f2fs_dblock_aops;
535
536 f2fs_lock_op(sbi);
537 err = f2fs_add_link(dentry, inode);
538 if (err)
539 goto out;
540 f2fs_unlock_op(sbi);
541 alloc_nid_done(sbi, inode->i_ino);
542
543 if (f2fs_encrypted_inode(inode)) {
544 struct qstr istr = QSTR_INIT(symname, len);
545 struct fscrypt_str ostr;
546
547 sd = kzalloc(disk_link.len, GFP_NOFS);
548 if (!sd) {
549 err = -ENOMEM;
550 goto err_out;
551 }
552
553 err = fscrypt_get_encryption_info(inode);
554 if (err)
555 goto err_out;
556
557 if (!fscrypt_has_encryption_key(inode)) {
558 err = -ENOKEY;
559 goto err_out;
560 }
561
562 ostr.name = sd->encrypted_path;
563 ostr.len = disk_link.len;
564 err = fscrypt_fname_usr_to_disk(inode, &istr, &ostr);
565 if (err)
566 goto err_out;
567
568 sd->len = cpu_to_le16(ostr.len);
569 disk_link.name = (char *)sd;
570 }
571
572 err = page_symlink(inode, disk_link.name, disk_link.len);
573
574 err_out:
575 d_instantiate(dentry, inode);
576 unlock_new_inode(inode);
577
578 /*
579 * Let's flush symlink data in order to avoid broken symlink as much as
580 * possible. Nevertheless, fsyncing is the best way, but there is no
581 * way to get a file descriptor in order to flush that.
582 *
583 * Note that, it needs to do dir->fsync to make this recoverable.
584 * If the symlink path is stored into inline_data, there is no
585 * performance regression.
586 */
587 if (!err) {
588 filemap_write_and_wait_range(inode->i_mapping, 0,
589 disk_link.len - 1);
590
591 if (IS_DIRSYNC(dir))
592 f2fs_sync_fs(sbi->sb, 1);
593 } else {
594 f2fs_unlink(dir, dentry);
595 }
596
597 kfree(sd);
598
599 f2fs_balance_fs(sbi, true);
600 return err;
601 out:
602 handle_failed_inode(inode);
603 return err;
604 }
605
606 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
607 {
608 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
609 struct inode *inode;
610 int err;
611
612 if (unlikely(f2fs_cp_error(sbi)))
613 return -EIO;
614
615 err = dquot_initialize(dir);
616 if (err)
617 return err;
618
619 inode = f2fs_new_inode(dir, S_IFDIR | mode);
620 if (IS_ERR(inode))
621 return PTR_ERR(inode);
622
623 inode->i_op = &f2fs_dir_inode_operations;
624 inode->i_fop = &f2fs_dir_operations;
625 inode->i_mapping->a_ops = &f2fs_dblock_aops;
626 mapping_set_gfp_mask(inode->i_mapping, GFP_F2FS_HIGH_ZERO);
627
628 set_inode_flag(inode, FI_INC_LINK);
629 f2fs_lock_op(sbi);
630 err = f2fs_add_link(dentry, inode);
631 if (err)
632 goto out_fail;
633 f2fs_unlock_op(sbi);
634
635 alloc_nid_done(sbi, inode->i_ino);
636
637 d_instantiate(dentry, inode);
638 unlock_new_inode(inode);
639
640 if (IS_DIRSYNC(dir))
641 f2fs_sync_fs(sbi->sb, 1);
642
643 f2fs_balance_fs(sbi, true);
644 return 0;
645
646 out_fail:
647 clear_inode_flag(inode, FI_INC_LINK);
648 handle_failed_inode(inode);
649 return err;
650 }
651
652 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
653 {
654 struct inode *inode = d_inode(dentry);
655 if (f2fs_empty_dir(inode))
656 return f2fs_unlink(dir, dentry);
657 return -ENOTEMPTY;
658 }
659
660 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
661 umode_t mode, dev_t rdev)
662 {
663 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
664 struct inode *inode;
665 int err = 0;
666
667 if (unlikely(f2fs_cp_error(sbi)))
668 return -EIO;
669
670 err = dquot_initialize(dir);
671 if (err)
672 return err;
673
674 inode = f2fs_new_inode(dir, mode);
675 if (IS_ERR(inode))
676 return PTR_ERR(inode);
677
678 init_special_inode(inode, inode->i_mode, rdev);
679 inode->i_op = &f2fs_special_inode_operations;
680
681 f2fs_lock_op(sbi);
682 err = f2fs_add_link(dentry, inode);
683 if (err)
684 goto out;
685 f2fs_unlock_op(sbi);
686
687 alloc_nid_done(sbi, inode->i_ino);
688
689 d_instantiate(dentry, inode);
690 unlock_new_inode(inode);
691
692 if (IS_DIRSYNC(dir))
693 f2fs_sync_fs(sbi->sb, 1);
694
695 f2fs_balance_fs(sbi, true);
696 return 0;
697 out:
698 handle_failed_inode(inode);
699 return err;
700 }
701
702 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
703 umode_t mode, struct inode **whiteout)
704 {
705 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
706 struct inode *inode;
707 int err;
708
709 err = dquot_initialize(dir);
710 if (err)
711 return err;
712
713 inode = f2fs_new_inode(dir, mode);
714 if (IS_ERR(inode))
715 return PTR_ERR(inode);
716
717 if (whiteout) {
718 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
719 inode->i_op = &f2fs_special_inode_operations;
720 } else {
721 inode->i_op = &f2fs_file_inode_operations;
722 inode->i_fop = &f2fs_file_operations;
723 inode->i_mapping->a_ops = &f2fs_dblock_aops;
724 }
725
726 f2fs_lock_op(sbi);
727 err = acquire_orphan_inode(sbi);
728 if (err)
729 goto out;
730
731 err = f2fs_do_tmpfile(inode, dir);
732 if (err)
733 goto release_out;
734
735 /*
736 * add this non-linked tmpfile to orphan list, in this way we could
737 * remove all unused data of tmpfile after abnormal power-off.
738 */
739 add_orphan_inode(inode);
740 alloc_nid_done(sbi, inode->i_ino);
741
742 if (whiteout) {
743 f2fs_i_links_write(inode, false);
744 *whiteout = inode;
745 } else {
746 d_tmpfile(dentry, inode);
747 }
748 /* link_count was changed by d_tmpfile as well. */
749 f2fs_unlock_op(sbi);
750 unlock_new_inode(inode);
751
752 f2fs_balance_fs(sbi, true);
753 return 0;
754
755 release_out:
756 release_orphan_inode(sbi);
757 out:
758 handle_failed_inode(inode);
759 return err;
760 }
761
762 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
763 {
764 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
765 return -EIO;
766
767 if (f2fs_encrypted_inode(dir)) {
768 int err = fscrypt_get_encryption_info(dir);
769 if (err)
770 return err;
771 }
772
773 return __f2fs_tmpfile(dir, dentry, mode, NULL);
774 }
775
776 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
777 {
778 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
779 return -EIO;
780
781 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
782 }
783
784 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
785 struct inode *new_dir, struct dentry *new_dentry,
786 unsigned int flags)
787 {
788 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
789 struct inode *old_inode = d_inode(old_dentry);
790 struct inode *new_inode = d_inode(new_dentry);
791 struct inode *whiteout = NULL;
792 struct page *old_dir_page;
793 struct page *old_page, *new_page = NULL;
794 struct f2fs_dir_entry *old_dir_entry = NULL;
795 struct f2fs_dir_entry *old_entry;
796 struct f2fs_dir_entry *new_entry;
797 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
798 int err = -ENOENT;
799
800 if (unlikely(f2fs_cp_error(sbi)))
801 return -EIO;
802
803 if ((f2fs_encrypted_inode(old_dir) &&
804 !fscrypt_has_encryption_key(old_dir)) ||
805 (f2fs_encrypted_inode(new_dir) &&
806 !fscrypt_has_encryption_key(new_dir)))
807 return -ENOKEY;
808
809 if ((old_dir != new_dir) && f2fs_encrypted_inode(new_dir) &&
810 !fscrypt_has_permitted_context(new_dir, old_inode)) {
811 err = -EPERM;
812 goto out;
813 }
814
815 if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
816 (!projid_eq(F2FS_I(new_dir)->i_projid,
817 F2FS_I(old_dentry->d_inode)->i_projid)))
818 return -EXDEV;
819
820 err = dquot_initialize(old_dir);
821 if (err)
822 goto out;
823
824 err = dquot_initialize(new_dir);
825 if (err)
826 goto out;
827
828 if (new_inode) {
829 err = dquot_initialize(new_inode);
830 if (err)
831 goto out;
832 }
833
834 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
835 if (!old_entry) {
836 if (IS_ERR(old_page))
837 err = PTR_ERR(old_page);
838 goto out;
839 }
840
841 if (S_ISDIR(old_inode->i_mode)) {
842 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
843 if (!old_dir_entry) {
844 if (IS_ERR(old_dir_page))
845 err = PTR_ERR(old_dir_page);
846 goto out_old;
847 }
848 }
849
850 if (flags & RENAME_WHITEOUT) {
851 err = f2fs_create_whiteout(old_dir, &whiteout);
852 if (err)
853 goto out_dir;
854 }
855
856 if (new_inode) {
857
858 err = -ENOTEMPTY;
859 if (old_dir_entry && !f2fs_empty_dir(new_inode))
860 goto out_whiteout;
861
862 err = -ENOENT;
863 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
864 &new_page);
865 if (!new_entry) {
866 if (IS_ERR(new_page))
867 err = PTR_ERR(new_page);
868 goto out_whiteout;
869 }
870
871 f2fs_balance_fs(sbi, true);
872
873 f2fs_lock_op(sbi);
874
875 err = acquire_orphan_inode(sbi);
876 if (err)
877 goto put_out_dir;
878
879 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
880
881 new_inode->i_ctime = current_time(new_inode);
882 down_write(&F2FS_I(new_inode)->i_sem);
883 if (old_dir_entry)
884 f2fs_i_links_write(new_inode, false);
885 f2fs_i_links_write(new_inode, false);
886 up_write(&F2FS_I(new_inode)->i_sem);
887
888 if (!new_inode->i_nlink)
889 add_orphan_inode(new_inode);
890 else
891 release_orphan_inode(sbi);
892 } else {
893 f2fs_balance_fs(sbi, true);
894
895 f2fs_lock_op(sbi);
896
897 err = f2fs_add_link(new_dentry, old_inode);
898 if (err) {
899 f2fs_unlock_op(sbi);
900 goto out_whiteout;
901 }
902
903 if (old_dir_entry)
904 f2fs_i_links_write(new_dir, true);
905
906 /*
907 * old entry and new entry can locate in the same inline
908 * dentry in inode, when attaching new entry in inline dentry,
909 * it could force inline dentry conversion, after that,
910 * old_entry and old_page will point to wrong address, in
911 * order to avoid this, let's do the check and update here.
912 */
913 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
914 f2fs_put_page(old_page, 0);
915 old_page = NULL;
916
917 old_entry = f2fs_find_entry(old_dir,
918 &old_dentry->d_name, &old_page);
919 if (!old_entry) {
920 err = -ENOENT;
921 if (IS_ERR(old_page))
922 err = PTR_ERR(old_page);
923 f2fs_unlock_op(sbi);
924 goto out_whiteout;
925 }
926 }
927 }
928
929 down_write(&F2FS_I(old_inode)->i_sem);
930 if (!old_dir_entry || whiteout)
931 file_lost_pino(old_inode);
932 else
933 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
934 up_write(&F2FS_I(old_inode)->i_sem);
935
936 old_inode->i_ctime = current_time(old_inode);
937 f2fs_mark_inode_dirty_sync(old_inode, false);
938
939 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
940
941 if (whiteout) {
942 whiteout->i_state |= I_LINKABLE;
943 set_inode_flag(whiteout, FI_INC_LINK);
944 err = f2fs_add_link(old_dentry, whiteout);
945 if (err)
946 goto put_out_dir;
947 whiteout->i_state &= ~I_LINKABLE;
948 iput(whiteout);
949 }
950
951 if (old_dir_entry) {
952 if (old_dir != new_dir && !whiteout) {
953 f2fs_set_link(old_inode, old_dir_entry,
954 old_dir_page, new_dir);
955 } else {
956 f2fs_dentry_kunmap(old_inode, old_dir_page);
957 f2fs_put_page(old_dir_page, 0);
958 }
959 f2fs_i_links_write(old_dir, false);
960 }
961
962 f2fs_unlock_op(sbi);
963
964 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
965 f2fs_sync_fs(sbi->sb, 1);
966 return 0;
967
968 put_out_dir:
969 f2fs_unlock_op(sbi);
970 if (new_page) {
971 f2fs_dentry_kunmap(new_dir, new_page);
972 f2fs_put_page(new_page, 0);
973 }
974 out_whiteout:
975 if (whiteout)
976 iput(whiteout);
977 out_dir:
978 if (old_dir_entry) {
979 f2fs_dentry_kunmap(old_inode, old_dir_page);
980 f2fs_put_page(old_dir_page, 0);
981 }
982 out_old:
983 f2fs_dentry_kunmap(old_dir, old_page);
984 f2fs_put_page(old_page, 0);
985 out:
986 return err;
987 }
988
989 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
990 struct inode *new_dir, struct dentry *new_dentry)
991 {
992 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
993 struct inode *old_inode = d_inode(old_dentry);
994 struct inode *new_inode = d_inode(new_dentry);
995 struct page *old_dir_page, *new_dir_page;
996 struct page *old_page, *new_page;
997 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
998 struct f2fs_dir_entry *old_entry, *new_entry;
999 int old_nlink = 0, new_nlink = 0;
1000 int err = -ENOENT;
1001
1002 if (unlikely(f2fs_cp_error(sbi)))
1003 return -EIO;
1004
1005 if ((f2fs_encrypted_inode(old_dir) &&
1006 !fscrypt_has_encryption_key(old_dir)) ||
1007 (f2fs_encrypted_inode(new_dir) &&
1008 !fscrypt_has_encryption_key(new_dir)))
1009 return -ENOKEY;
1010
1011 if ((f2fs_encrypted_inode(old_dir) || f2fs_encrypted_inode(new_dir)) &&
1012 (old_dir != new_dir) &&
1013 (!fscrypt_has_permitted_context(new_dir, old_inode) ||
1014 !fscrypt_has_permitted_context(old_dir, new_inode)))
1015 return -EPERM;
1016
1017 if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1018 !projid_eq(F2FS_I(new_dir)->i_projid,
1019 F2FS_I(old_dentry->d_inode)->i_projid)) ||
1020 (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1021 !projid_eq(F2FS_I(old_dir)->i_projid,
1022 F2FS_I(new_dentry->d_inode)->i_projid)))
1023 return -EXDEV;
1024
1025 err = dquot_initialize(old_dir);
1026 if (err)
1027 goto out;
1028
1029 err = dquot_initialize(new_dir);
1030 if (err)
1031 goto out;
1032
1033 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1034 if (!old_entry) {
1035 if (IS_ERR(old_page))
1036 err = PTR_ERR(old_page);
1037 goto out;
1038 }
1039
1040 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1041 if (!new_entry) {
1042 if (IS_ERR(new_page))
1043 err = PTR_ERR(new_page);
1044 goto out_old;
1045 }
1046
1047 /* prepare for updating ".." directory entry info later */
1048 if (old_dir != new_dir) {
1049 if (S_ISDIR(old_inode->i_mode)) {
1050 old_dir_entry = f2fs_parent_dir(old_inode,
1051 &old_dir_page);
1052 if (!old_dir_entry) {
1053 if (IS_ERR(old_dir_page))
1054 err = PTR_ERR(old_dir_page);
1055 goto out_new;
1056 }
1057 }
1058
1059 if (S_ISDIR(new_inode->i_mode)) {
1060 new_dir_entry = f2fs_parent_dir(new_inode,
1061 &new_dir_page);
1062 if (!new_dir_entry) {
1063 if (IS_ERR(new_dir_page))
1064 err = PTR_ERR(new_dir_page);
1065 goto out_old_dir;
1066 }
1067 }
1068 }
1069
1070 /*
1071 * If cross rename between file and directory those are not
1072 * in the same directory, we will inc nlink of file's parent
1073 * later, so we should check upper boundary of its nlink.
1074 */
1075 if ((!old_dir_entry || !new_dir_entry) &&
1076 old_dir_entry != new_dir_entry) {
1077 old_nlink = old_dir_entry ? -1 : 1;
1078 new_nlink = -old_nlink;
1079 err = -EMLINK;
1080 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1081 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1082 goto out_new_dir;
1083 }
1084
1085 f2fs_balance_fs(sbi, true);
1086
1087 f2fs_lock_op(sbi);
1088
1089 /* update ".." directory entry info of old dentry */
1090 if (old_dir_entry)
1091 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1092
1093 /* update ".." directory entry info of new dentry */
1094 if (new_dir_entry)
1095 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1096
1097 /* update directory entry info of old dir inode */
1098 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1099
1100 down_write(&F2FS_I(old_inode)->i_sem);
1101 file_lost_pino(old_inode);
1102 up_write(&F2FS_I(old_inode)->i_sem);
1103
1104 old_dir->i_ctime = current_time(old_dir);
1105 if (old_nlink) {
1106 down_write(&F2FS_I(old_dir)->i_sem);
1107 f2fs_i_links_write(old_dir, old_nlink > 0);
1108 up_write(&F2FS_I(old_dir)->i_sem);
1109 }
1110 f2fs_mark_inode_dirty_sync(old_dir, false);
1111
1112 /* update directory entry info of new dir inode */
1113 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1114
1115 down_write(&F2FS_I(new_inode)->i_sem);
1116 file_lost_pino(new_inode);
1117 up_write(&F2FS_I(new_inode)->i_sem);
1118
1119 new_dir->i_ctime = current_time(new_dir);
1120 if (new_nlink) {
1121 down_write(&F2FS_I(new_dir)->i_sem);
1122 f2fs_i_links_write(new_dir, new_nlink > 0);
1123 up_write(&F2FS_I(new_dir)->i_sem);
1124 }
1125 f2fs_mark_inode_dirty_sync(new_dir, false);
1126
1127 f2fs_unlock_op(sbi);
1128
1129 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1130 f2fs_sync_fs(sbi->sb, 1);
1131 return 0;
1132 out_new_dir:
1133 if (new_dir_entry) {
1134 f2fs_dentry_kunmap(new_inode, new_dir_page);
1135 f2fs_put_page(new_dir_page, 0);
1136 }
1137 out_old_dir:
1138 if (old_dir_entry) {
1139 f2fs_dentry_kunmap(old_inode, old_dir_page);
1140 f2fs_put_page(old_dir_page, 0);
1141 }
1142 out_new:
1143 f2fs_dentry_kunmap(new_dir, new_page);
1144 f2fs_put_page(new_page, 0);
1145 out_old:
1146 f2fs_dentry_kunmap(old_dir, old_page);
1147 f2fs_put_page(old_page, 0);
1148 out:
1149 return err;
1150 }
1151
1152 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1153 struct inode *new_dir, struct dentry *new_dentry,
1154 unsigned int flags)
1155 {
1156 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1157 return -EINVAL;
1158
1159 if (flags & RENAME_EXCHANGE) {
1160 return f2fs_cross_rename(old_dir, old_dentry,
1161 new_dir, new_dentry);
1162 }
1163 /*
1164 * VFS has already handled the new dentry existence case,
1165 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1166 */
1167 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1168 }
1169
1170 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1171 struct inode *inode,
1172 struct delayed_call *done)
1173 {
1174 struct page *cpage = NULL;
1175 char *caddr, *paddr = NULL;
1176 struct fscrypt_str cstr = FSTR_INIT(NULL, 0);
1177 struct fscrypt_str pstr = FSTR_INIT(NULL, 0);
1178 struct fscrypt_symlink_data *sd;
1179 u32 max_size = inode->i_sb->s_blocksize;
1180 int res;
1181
1182 if (!dentry)
1183 return ERR_PTR(-ECHILD);
1184
1185 res = fscrypt_get_encryption_info(inode);
1186 if (res)
1187 return ERR_PTR(res);
1188
1189 cpage = read_mapping_page(inode->i_mapping, 0, NULL);
1190 if (IS_ERR(cpage))
1191 return ERR_CAST(cpage);
1192 caddr = page_address(cpage);
1193
1194 /* Symlink is encrypted */
1195 sd = (struct fscrypt_symlink_data *)caddr;
1196 cstr.name = sd->encrypted_path;
1197 cstr.len = le16_to_cpu(sd->len);
1198
1199 /* this is broken symlink case */
1200 if (unlikely(cstr.len == 0)) {
1201 res = -ENOENT;
1202 goto errout;
1203 }
1204
1205 if ((cstr.len + sizeof(struct fscrypt_symlink_data) - 1) > max_size) {
1206 /* Symlink data on the disk is corrupted */
1207 res = -EIO;
1208 goto errout;
1209 }
1210 res = fscrypt_fname_alloc_buffer(inode, cstr.len, &pstr);
1211 if (res)
1212 goto errout;
1213
1214 res = fscrypt_fname_disk_to_usr(inode, 0, 0, &cstr, &pstr);
1215 if (res)
1216 goto errout;
1217
1218 /* this is broken symlink case */
1219 if (unlikely(pstr.name[0] == 0)) {
1220 res = -ENOENT;
1221 goto errout;
1222 }
1223
1224 paddr = pstr.name;
1225
1226 /* Null-terminate the name */
1227 paddr[pstr.len] = '\0';
1228
1229 put_page(cpage);
1230 set_delayed_call(done, kfree_link, paddr);
1231 return paddr;
1232 errout:
1233 fscrypt_fname_free_buffer(&pstr);
1234 put_page(cpage);
1235 return ERR_PTR(res);
1236 }
1237
1238 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1239 .get_link = f2fs_encrypted_get_link,
1240 .getattr = f2fs_getattr,
1241 .setattr = f2fs_setattr,
1242 #ifdef CONFIG_F2FS_FS_XATTR
1243 .listxattr = f2fs_listxattr,
1244 #endif
1245 };
1246
1247 const struct inode_operations f2fs_dir_inode_operations = {
1248 .create = f2fs_create,
1249 .lookup = f2fs_lookup,
1250 .link = f2fs_link,
1251 .unlink = f2fs_unlink,
1252 .symlink = f2fs_symlink,
1253 .mkdir = f2fs_mkdir,
1254 .rmdir = f2fs_rmdir,
1255 .mknod = f2fs_mknod,
1256 .rename = f2fs_rename2,
1257 .tmpfile = f2fs_tmpfile,
1258 .getattr = f2fs_getattr,
1259 .setattr = f2fs_setattr,
1260 .get_acl = f2fs_get_acl,
1261 .set_acl = f2fs_set_acl,
1262 #ifdef CONFIG_F2FS_FS_XATTR
1263 .listxattr = f2fs_listxattr,
1264 #endif
1265 };
1266
1267 const struct inode_operations f2fs_symlink_inode_operations = {
1268 .get_link = f2fs_get_link,
1269 .getattr = f2fs_getattr,
1270 .setattr = f2fs_setattr,
1271 #ifdef CONFIG_F2FS_FS_XATTR
1272 .listxattr = f2fs_listxattr,
1273 #endif
1274 };
1275
1276 const struct inode_operations f2fs_special_inode_operations = {
1277 .getattr = f2fs_getattr,
1278 .setattr = f2fs_setattr,
1279 .get_acl = f2fs_get_acl,
1280 .set_acl = f2fs_set_acl,
1281 #ifdef CONFIG_F2FS_FS_XATTR
1282 .listxattr = f2fs_listxattr,
1283 #endif
1284 };
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