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Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[mirror_ubuntu-eoan-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 (!f2fs_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 F2FS_I(inode)->i_crtime = inode->i_mtime;
55 inode->i_generation = sbi->s_next_generation++;
56
57 if (S_ISDIR(inode->i_mode))
58 F2FS_I(inode)->i_current_depth = 1;
59
60 err = insert_inode_locked(inode);
61 if (err) {
62 err = -EINVAL;
63 goto fail;
64 }
65
66 if (f2fs_sb_has_project_quota(sbi->sb) &&
67 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
68 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
69 else
70 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
71 F2FS_DEF_PROJID);
72
73 err = dquot_initialize(inode);
74 if (err)
75 goto fail_drop;
76
77 err = dquot_alloc_inode(inode);
78 if (err)
79 goto fail_drop;
80
81 set_inode_flag(inode, FI_NEW_INODE);
82
83 /* If the directory encrypted, then we should encrypt the inode. */
84 if ((f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
85 f2fs_may_encrypt(inode))
86 f2fs_set_encrypted_inode(inode);
87
88 if (f2fs_sb_has_extra_attr(sbi->sb)) {
89 set_inode_flag(inode, FI_EXTRA_ATTR);
90 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
91 }
92
93 if (test_opt(sbi, INLINE_XATTR))
94 set_inode_flag(inode, FI_INLINE_XATTR);
95
96 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
97 set_inode_flag(inode, FI_INLINE_DATA);
98 if (f2fs_may_inline_dentry(inode))
99 set_inode_flag(inode, FI_INLINE_DENTRY);
100
101 if (f2fs_sb_has_flexible_inline_xattr(sbi->sb)) {
102 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
103 if (f2fs_has_inline_xattr(inode))
104 xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
105 /* Otherwise, will be 0 */
106 } else if (f2fs_has_inline_xattr(inode) ||
107 f2fs_has_inline_dentry(inode)) {
108 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
109 }
110 F2FS_I(inode)->i_inline_xattr_size = xattr_size;
111
112 f2fs_init_extent_tree(inode, NULL);
113
114 stat_inc_inline_xattr(inode);
115 stat_inc_inline_inode(inode);
116 stat_inc_inline_dir(inode);
117
118 F2FS_I(inode)->i_flags =
119 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
120
121 if (S_ISDIR(inode->i_mode))
122 F2FS_I(inode)->i_flags |= F2FS_INDEX_FL;
123
124 if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
125 set_inode_flag(inode, FI_PROJ_INHERIT);
126
127 trace_f2fs_new_inode(inode, 0);
128 return inode;
129
130 fail:
131 trace_f2fs_new_inode(inode, err);
132 make_bad_inode(inode);
133 if (nid_free)
134 set_inode_flag(inode, FI_FREE_NID);
135 iput(inode);
136 return ERR_PTR(err);
137 fail_drop:
138 trace_f2fs_new_inode(inode, err);
139 dquot_drop(inode);
140 inode->i_flags |= S_NOQUOTA;
141 if (nid_free)
142 set_inode_flag(inode, FI_FREE_NID);
143 clear_nlink(inode);
144 unlock_new_inode(inode);
145 iput(inode);
146 return ERR_PTR(err);
147 }
148
149 static int is_extension_exist(const unsigned char *s, const char *sub)
150 {
151 size_t slen = strlen(s);
152 size_t sublen = strlen(sub);
153 int i;
154
155 /*
156 * filename format of multimedia file should be defined as:
157 * "filename + '.' + extension + (optional: '.' + temp extension)".
158 */
159 if (slen < sublen + 2)
160 return 0;
161
162 for (i = 1; i < slen - sublen; i++) {
163 if (s[i] != '.')
164 continue;
165 if (!strncasecmp(s + i + 1, sub, sublen))
166 return 1;
167 }
168
169 return 0;
170 }
171
172 /*
173 * Set multimedia files as cold files for hot/cold data separation
174 */
175 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
176 const unsigned char *name)
177 {
178 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
179 int i, cold_count, hot_count;
180
181 down_read(&sbi->sb_lock);
182
183 cold_count = le32_to_cpu(sbi->raw_super->extension_count);
184 hot_count = sbi->raw_super->hot_ext_count;
185
186 for (i = 0; i < cold_count + hot_count; i++) {
187 if (!is_extension_exist(name, extlist[i]))
188 continue;
189 if (i < cold_count)
190 file_set_cold(inode);
191 else
192 file_set_hot(inode);
193 break;
194 }
195
196 up_read(&sbi->sb_lock);
197 }
198
199 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
200 bool hot, bool set)
201 {
202 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
203 int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
204 int hot_count = sbi->raw_super->hot_ext_count;
205 int total_count = cold_count + hot_count;
206 int start, count;
207 int i;
208
209 if (set) {
210 if (total_count == F2FS_MAX_EXTENSION)
211 return -EINVAL;
212 } else {
213 if (!hot && !cold_count)
214 return -EINVAL;
215 if (hot && !hot_count)
216 return -EINVAL;
217 }
218
219 if (hot) {
220 start = cold_count;
221 count = total_count;
222 } else {
223 start = 0;
224 count = cold_count;
225 }
226
227 for (i = start; i < count; i++) {
228 if (strcmp(name, extlist[i]))
229 continue;
230
231 if (set)
232 return -EINVAL;
233
234 memcpy(extlist[i], extlist[i + 1],
235 F2FS_EXTENSION_LEN * (total_count - i - 1));
236 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
237 if (hot)
238 sbi->raw_super->hot_ext_count = hot_count - 1;
239 else
240 sbi->raw_super->extension_count =
241 cpu_to_le32(cold_count - 1);
242 return 0;
243 }
244
245 if (!set)
246 return -EINVAL;
247
248 if (hot) {
249 memcpy(extlist[count], name, strlen(name));
250 sbi->raw_super->hot_ext_count = hot_count + 1;
251 } else {
252 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
253
254 memcpy(buf, &extlist[cold_count],
255 F2FS_EXTENSION_LEN * hot_count);
256 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
257 memcpy(extlist[cold_count], name, strlen(name));
258 memcpy(&extlist[cold_count + 1], buf,
259 F2FS_EXTENSION_LEN * hot_count);
260 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
261 }
262 return 0;
263 }
264
265 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
266 bool excl)
267 {
268 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
269 struct inode *inode;
270 nid_t ino = 0;
271 int err;
272
273 if (unlikely(f2fs_cp_error(sbi)))
274 return -EIO;
275
276 err = dquot_initialize(dir);
277 if (err)
278 return err;
279
280 inode = f2fs_new_inode(dir, mode);
281 if (IS_ERR(inode))
282 return PTR_ERR(inode);
283
284 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
285 set_file_temperature(sbi, inode, dentry->d_name.name);
286
287 inode->i_op = &f2fs_file_inode_operations;
288 inode->i_fop = &f2fs_file_operations;
289 inode->i_mapping->a_ops = &f2fs_dblock_aops;
290 ino = inode->i_ino;
291
292 f2fs_lock_op(sbi);
293 err = f2fs_add_link(dentry, inode);
294 if (err)
295 goto out;
296 f2fs_unlock_op(sbi);
297
298 f2fs_alloc_nid_done(sbi, ino);
299
300 d_instantiate_new(dentry, inode);
301
302 if (IS_DIRSYNC(dir))
303 f2fs_sync_fs(sbi->sb, 1);
304
305 f2fs_balance_fs(sbi, true);
306 return 0;
307 out:
308 f2fs_handle_failed_inode(inode);
309 return err;
310 }
311
312 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
313 struct dentry *dentry)
314 {
315 struct inode *inode = d_inode(old_dentry);
316 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
317 int err;
318
319 if (unlikely(f2fs_cp_error(sbi)))
320 return -EIO;
321
322 err = fscrypt_prepare_link(old_dentry, dir, dentry);
323 if (err)
324 return err;
325
326 if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
327 (!projid_eq(F2FS_I(dir)->i_projid,
328 F2FS_I(old_dentry->d_inode)->i_projid)))
329 return -EXDEV;
330
331 err = dquot_initialize(dir);
332 if (err)
333 return err;
334
335 f2fs_balance_fs(sbi, true);
336
337 inode->i_ctime = current_time(inode);
338 ihold(inode);
339
340 set_inode_flag(inode, FI_INC_LINK);
341 f2fs_lock_op(sbi);
342 err = f2fs_add_link(dentry, inode);
343 if (err)
344 goto out;
345 f2fs_unlock_op(sbi);
346
347 d_instantiate(dentry, inode);
348
349 if (IS_DIRSYNC(dir))
350 f2fs_sync_fs(sbi->sb, 1);
351 return 0;
352 out:
353 clear_inode_flag(inode, FI_INC_LINK);
354 iput(inode);
355 f2fs_unlock_op(sbi);
356 return err;
357 }
358
359 struct dentry *f2fs_get_parent(struct dentry *child)
360 {
361 struct qstr dotdot = QSTR_INIT("..", 2);
362 struct page *page;
363 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
364 if (!ino) {
365 if (IS_ERR(page))
366 return ERR_CAST(page);
367 return ERR_PTR(-ENOENT);
368 }
369 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
370 }
371
372 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
373 {
374 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
375 struct qstr dot = QSTR_INIT(".", 1);
376 struct qstr dotdot = QSTR_INIT("..", 2);
377 struct f2fs_dir_entry *de;
378 struct page *page;
379 int err = 0;
380
381 if (f2fs_readonly(sbi->sb)) {
382 f2fs_msg(sbi->sb, KERN_INFO,
383 "skip recovering inline_dots inode (ino:%lu, pino:%u) "
384 "in readonly mountpoint", dir->i_ino, pino);
385 return 0;
386 }
387
388 err = dquot_initialize(dir);
389 if (err)
390 return err;
391
392 f2fs_balance_fs(sbi, true);
393
394 f2fs_lock_op(sbi);
395
396 de = f2fs_find_entry(dir, &dot, &page);
397 if (de) {
398 f2fs_put_page(page, 0);
399 } else if (IS_ERR(page)) {
400 err = PTR_ERR(page);
401 goto out;
402 } else {
403 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
404 if (err)
405 goto out;
406 }
407
408 de = f2fs_find_entry(dir, &dotdot, &page);
409 if (de)
410 f2fs_put_page(page, 0);
411 else if (IS_ERR(page))
412 err = PTR_ERR(page);
413 else
414 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
415 out:
416 if (!err)
417 clear_inode_flag(dir, FI_INLINE_DOTS);
418
419 f2fs_unlock_op(sbi);
420 return err;
421 }
422
423 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
424 unsigned int flags)
425 {
426 struct inode *inode = NULL;
427 struct f2fs_dir_entry *de;
428 struct page *page;
429 struct dentry *new;
430 nid_t ino = -1;
431 int err = 0;
432 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
433
434 trace_f2fs_lookup_start(dir, dentry, flags);
435
436 err = fscrypt_prepare_lookup(dir, dentry, flags);
437 if (err)
438 goto out;
439
440 if (dentry->d_name.len > F2FS_NAME_LEN) {
441 err = -ENAMETOOLONG;
442 goto out;
443 }
444
445 de = f2fs_find_entry(dir, &dentry->d_name, &page);
446 if (!de) {
447 if (IS_ERR(page)) {
448 err = PTR_ERR(page);
449 goto out;
450 }
451 goto out_splice;
452 }
453
454 ino = le32_to_cpu(de->ino);
455 f2fs_put_page(page, 0);
456
457 inode = f2fs_iget(dir->i_sb, ino);
458 if (IS_ERR(inode)) {
459 err = PTR_ERR(inode);
460 goto out;
461 }
462
463 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
464 err = __recover_dot_dentries(dir, root_ino);
465 if (err)
466 goto out_iput;
467 }
468
469 if (f2fs_has_inline_dots(inode)) {
470 err = __recover_dot_dentries(inode, dir->i_ino);
471 if (err)
472 goto out_iput;
473 }
474 if (f2fs_encrypted_inode(dir) &&
475 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
476 !fscrypt_has_permitted_context(dir, inode)) {
477 f2fs_msg(inode->i_sb, KERN_WARNING,
478 "Inconsistent encryption contexts: %lu/%lu",
479 dir->i_ino, inode->i_ino);
480 err = -EPERM;
481 goto out_iput;
482 }
483 out_splice:
484 new = d_splice_alias(inode, dentry);
485 if (IS_ERR(new))
486 err = PTR_ERR(new);
487 trace_f2fs_lookup_end(dir, dentry, ino, err);
488 return new;
489 out_iput:
490 iput(inode);
491 out:
492 trace_f2fs_lookup_end(dir, dentry, ino, err);
493 return ERR_PTR(err);
494 }
495
496 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
497 {
498 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
499 struct inode *inode = d_inode(dentry);
500 struct f2fs_dir_entry *de;
501 struct page *page;
502 int err = -ENOENT;
503
504 trace_f2fs_unlink_enter(dir, dentry);
505
506 if (unlikely(f2fs_cp_error(sbi)))
507 return -EIO;
508
509 err = dquot_initialize(dir);
510 if (err)
511 return err;
512 err = dquot_initialize(inode);
513 if (err)
514 return err;
515
516 de = f2fs_find_entry(dir, &dentry->d_name, &page);
517 if (!de) {
518 if (IS_ERR(page))
519 err = PTR_ERR(page);
520 goto fail;
521 }
522
523 f2fs_balance_fs(sbi, true);
524
525 f2fs_lock_op(sbi);
526 err = f2fs_acquire_orphan_inode(sbi);
527 if (err) {
528 f2fs_unlock_op(sbi);
529 f2fs_put_page(page, 0);
530 goto fail;
531 }
532 f2fs_delete_entry(de, page, dir, inode);
533 f2fs_unlock_op(sbi);
534
535 if (IS_DIRSYNC(dir))
536 f2fs_sync_fs(sbi->sb, 1);
537 fail:
538 trace_f2fs_unlink_exit(inode, err);
539 return err;
540 }
541
542 static const char *f2fs_get_link(struct dentry *dentry,
543 struct inode *inode,
544 struct delayed_call *done)
545 {
546 const char *link = page_get_link(dentry, inode, done);
547 if (!IS_ERR(link) && !*link) {
548 /* this is broken symlink case */
549 do_delayed_call(done);
550 clear_delayed_call(done);
551 link = ERR_PTR(-ENOENT);
552 }
553 return link;
554 }
555
556 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
557 const char *symname)
558 {
559 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
560 struct inode *inode;
561 size_t len = strlen(symname);
562 struct fscrypt_str disk_link;
563 int err;
564
565 if (unlikely(f2fs_cp_error(sbi)))
566 return -EIO;
567
568 err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
569 &disk_link);
570 if (err)
571 return err;
572
573 err = dquot_initialize(dir);
574 if (err)
575 return err;
576
577 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
578 if (IS_ERR(inode))
579 return PTR_ERR(inode);
580
581 if (IS_ENCRYPTED(inode))
582 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
583 else
584 inode->i_op = &f2fs_symlink_inode_operations;
585 inode_nohighmem(inode);
586 inode->i_mapping->a_ops = &f2fs_dblock_aops;
587
588 f2fs_lock_op(sbi);
589 err = f2fs_add_link(dentry, inode);
590 if (err)
591 goto out_f2fs_handle_failed_inode;
592 f2fs_unlock_op(sbi);
593 f2fs_alloc_nid_done(sbi, inode->i_ino);
594
595 err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
596 if (err)
597 goto err_out;
598
599 err = page_symlink(inode, disk_link.name, disk_link.len);
600
601 err_out:
602 d_instantiate_new(dentry, inode);
603
604 /*
605 * Let's flush symlink data in order to avoid broken symlink as much as
606 * possible. Nevertheless, fsyncing is the best way, but there is no
607 * way to get a file descriptor in order to flush that.
608 *
609 * Note that, it needs to do dir->fsync to make this recoverable.
610 * If the symlink path is stored into inline_data, there is no
611 * performance regression.
612 */
613 if (!err) {
614 filemap_write_and_wait_range(inode->i_mapping, 0,
615 disk_link.len - 1);
616
617 if (IS_DIRSYNC(dir))
618 f2fs_sync_fs(sbi->sb, 1);
619 } else {
620 f2fs_unlink(dir, dentry);
621 }
622
623 f2fs_balance_fs(sbi, true);
624 goto out_free_encrypted_link;
625
626 out_f2fs_handle_failed_inode:
627 f2fs_handle_failed_inode(inode);
628 out_free_encrypted_link:
629 if (disk_link.name != (unsigned char *)symname)
630 kfree(disk_link.name);
631 return err;
632 }
633
634 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
635 {
636 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
637 struct inode *inode;
638 int err;
639
640 if (unlikely(f2fs_cp_error(sbi)))
641 return -EIO;
642
643 err = dquot_initialize(dir);
644 if (err)
645 return err;
646
647 inode = f2fs_new_inode(dir, S_IFDIR | mode);
648 if (IS_ERR(inode))
649 return PTR_ERR(inode);
650
651 inode->i_op = &f2fs_dir_inode_operations;
652 inode->i_fop = &f2fs_dir_operations;
653 inode->i_mapping->a_ops = &f2fs_dblock_aops;
654 inode_nohighmem(inode);
655
656 set_inode_flag(inode, FI_INC_LINK);
657 f2fs_lock_op(sbi);
658 err = f2fs_add_link(dentry, inode);
659 if (err)
660 goto out_fail;
661 f2fs_unlock_op(sbi);
662
663 f2fs_alloc_nid_done(sbi, inode->i_ino);
664
665 d_instantiate_new(dentry, inode);
666
667 if (IS_DIRSYNC(dir))
668 f2fs_sync_fs(sbi->sb, 1);
669
670 f2fs_balance_fs(sbi, true);
671 return 0;
672
673 out_fail:
674 clear_inode_flag(inode, FI_INC_LINK);
675 f2fs_handle_failed_inode(inode);
676 return err;
677 }
678
679 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
680 {
681 struct inode *inode = d_inode(dentry);
682 if (f2fs_empty_dir(inode))
683 return f2fs_unlink(dir, dentry);
684 return -ENOTEMPTY;
685 }
686
687 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
688 umode_t mode, dev_t rdev)
689 {
690 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
691 struct inode *inode;
692 int err = 0;
693
694 if (unlikely(f2fs_cp_error(sbi)))
695 return -EIO;
696
697 err = dquot_initialize(dir);
698 if (err)
699 return err;
700
701 inode = f2fs_new_inode(dir, mode);
702 if (IS_ERR(inode))
703 return PTR_ERR(inode);
704
705 init_special_inode(inode, inode->i_mode, rdev);
706 inode->i_op = &f2fs_special_inode_operations;
707
708 f2fs_lock_op(sbi);
709 err = f2fs_add_link(dentry, inode);
710 if (err)
711 goto out;
712 f2fs_unlock_op(sbi);
713
714 f2fs_alloc_nid_done(sbi, inode->i_ino);
715
716 d_instantiate_new(dentry, inode);
717
718 if (IS_DIRSYNC(dir))
719 f2fs_sync_fs(sbi->sb, 1);
720
721 f2fs_balance_fs(sbi, true);
722 return 0;
723 out:
724 f2fs_handle_failed_inode(inode);
725 return err;
726 }
727
728 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
729 umode_t mode, struct inode **whiteout)
730 {
731 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
732 struct inode *inode;
733 int err;
734
735 err = dquot_initialize(dir);
736 if (err)
737 return err;
738
739 inode = f2fs_new_inode(dir, mode);
740 if (IS_ERR(inode))
741 return PTR_ERR(inode);
742
743 if (whiteout) {
744 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
745 inode->i_op = &f2fs_special_inode_operations;
746 } else {
747 inode->i_op = &f2fs_file_inode_operations;
748 inode->i_fop = &f2fs_file_operations;
749 inode->i_mapping->a_ops = &f2fs_dblock_aops;
750 }
751
752 f2fs_lock_op(sbi);
753 err = f2fs_acquire_orphan_inode(sbi);
754 if (err)
755 goto out;
756
757 err = f2fs_do_tmpfile(inode, dir);
758 if (err)
759 goto release_out;
760
761 /*
762 * add this non-linked tmpfile to orphan list, in this way we could
763 * remove all unused data of tmpfile after abnormal power-off.
764 */
765 f2fs_add_orphan_inode(inode);
766 f2fs_alloc_nid_done(sbi, inode->i_ino);
767
768 if (whiteout) {
769 f2fs_i_links_write(inode, false);
770 *whiteout = inode;
771 } else {
772 d_tmpfile(dentry, inode);
773 }
774 /* link_count was changed by d_tmpfile as well. */
775 f2fs_unlock_op(sbi);
776 unlock_new_inode(inode);
777
778 f2fs_balance_fs(sbi, true);
779 return 0;
780
781 release_out:
782 f2fs_release_orphan_inode(sbi);
783 out:
784 f2fs_handle_failed_inode(inode);
785 return err;
786 }
787
788 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
789 {
790 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
791
792 if (unlikely(f2fs_cp_error(sbi)))
793 return -EIO;
794
795 if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
796 int err = fscrypt_get_encryption_info(dir);
797 if (err)
798 return err;
799 }
800
801 return __f2fs_tmpfile(dir, dentry, mode, NULL);
802 }
803
804 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
805 {
806 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
807 return -EIO;
808
809 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
810 }
811
812 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
813 struct inode *new_dir, struct dentry *new_dentry,
814 unsigned int flags)
815 {
816 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
817 struct inode *old_inode = d_inode(old_dentry);
818 struct inode *new_inode = d_inode(new_dentry);
819 struct inode *whiteout = NULL;
820 struct page *old_dir_page;
821 struct page *old_page, *new_page = NULL;
822 struct f2fs_dir_entry *old_dir_entry = NULL;
823 struct f2fs_dir_entry *old_entry;
824 struct f2fs_dir_entry *new_entry;
825 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
826 int err = -ENOENT;
827
828 if (unlikely(f2fs_cp_error(sbi)))
829 return -EIO;
830
831 if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
832 (!projid_eq(F2FS_I(new_dir)->i_projid,
833 F2FS_I(old_dentry->d_inode)->i_projid)))
834 return -EXDEV;
835
836 err = dquot_initialize(old_dir);
837 if (err)
838 goto out;
839
840 err = dquot_initialize(new_dir);
841 if (err)
842 goto out;
843
844 if (new_inode) {
845 err = dquot_initialize(new_inode);
846 if (err)
847 goto out;
848 }
849
850 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
851 if (!old_entry) {
852 if (IS_ERR(old_page))
853 err = PTR_ERR(old_page);
854 goto out;
855 }
856
857 if (S_ISDIR(old_inode->i_mode)) {
858 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
859 if (!old_dir_entry) {
860 if (IS_ERR(old_dir_page))
861 err = PTR_ERR(old_dir_page);
862 goto out_old;
863 }
864 }
865
866 if (flags & RENAME_WHITEOUT) {
867 err = f2fs_create_whiteout(old_dir, &whiteout);
868 if (err)
869 goto out_dir;
870 }
871
872 if (new_inode) {
873
874 err = -ENOTEMPTY;
875 if (old_dir_entry && !f2fs_empty_dir(new_inode))
876 goto out_whiteout;
877
878 err = -ENOENT;
879 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
880 &new_page);
881 if (!new_entry) {
882 if (IS_ERR(new_page))
883 err = PTR_ERR(new_page);
884 goto out_whiteout;
885 }
886
887 f2fs_balance_fs(sbi, true);
888
889 f2fs_lock_op(sbi);
890
891 err = f2fs_acquire_orphan_inode(sbi);
892 if (err)
893 goto put_out_dir;
894
895 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
896
897 new_inode->i_ctime = current_time(new_inode);
898 down_write(&F2FS_I(new_inode)->i_sem);
899 if (old_dir_entry)
900 f2fs_i_links_write(new_inode, false);
901 f2fs_i_links_write(new_inode, false);
902 up_write(&F2FS_I(new_inode)->i_sem);
903
904 if (!new_inode->i_nlink)
905 f2fs_add_orphan_inode(new_inode);
906 else
907 f2fs_release_orphan_inode(sbi);
908 } else {
909 f2fs_balance_fs(sbi, true);
910
911 f2fs_lock_op(sbi);
912
913 err = f2fs_add_link(new_dentry, old_inode);
914 if (err) {
915 f2fs_unlock_op(sbi);
916 goto out_whiteout;
917 }
918
919 if (old_dir_entry)
920 f2fs_i_links_write(new_dir, true);
921
922 /*
923 * old entry and new entry can locate in the same inline
924 * dentry in inode, when attaching new entry in inline dentry,
925 * it could force inline dentry conversion, after that,
926 * old_entry and old_page will point to wrong address, in
927 * order to avoid this, let's do the check and update here.
928 */
929 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
930 f2fs_put_page(old_page, 0);
931 old_page = NULL;
932
933 old_entry = f2fs_find_entry(old_dir,
934 &old_dentry->d_name, &old_page);
935 if (!old_entry) {
936 err = -ENOENT;
937 if (IS_ERR(old_page))
938 err = PTR_ERR(old_page);
939 f2fs_unlock_op(sbi);
940 goto out_whiteout;
941 }
942 }
943 }
944
945 down_write(&F2FS_I(old_inode)->i_sem);
946 if (!old_dir_entry || whiteout)
947 file_lost_pino(old_inode);
948 else
949 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
950 up_write(&F2FS_I(old_inode)->i_sem);
951
952 old_inode->i_ctime = current_time(old_inode);
953 f2fs_mark_inode_dirty_sync(old_inode, false);
954
955 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
956
957 if (whiteout) {
958 whiteout->i_state |= I_LINKABLE;
959 set_inode_flag(whiteout, FI_INC_LINK);
960 err = f2fs_add_link(old_dentry, whiteout);
961 if (err)
962 goto put_out_dir;
963 whiteout->i_state &= ~I_LINKABLE;
964 iput(whiteout);
965 }
966
967 if (old_dir_entry) {
968 if (old_dir != new_dir && !whiteout)
969 f2fs_set_link(old_inode, old_dir_entry,
970 old_dir_page, new_dir);
971 else
972 f2fs_put_page(old_dir_page, 0);
973 f2fs_i_links_write(old_dir, false);
974 }
975 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
976 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
977 if (S_ISDIR(old_inode->i_mode))
978 f2fs_add_ino_entry(sbi, old_inode->i_ino,
979 TRANS_DIR_INO);
980 }
981
982 f2fs_unlock_op(sbi);
983
984 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
985 f2fs_sync_fs(sbi->sb, 1);
986 return 0;
987
988 put_out_dir:
989 f2fs_unlock_op(sbi);
990 if (new_page)
991 f2fs_put_page(new_page, 0);
992 out_whiteout:
993 if (whiteout)
994 iput(whiteout);
995 out_dir:
996 if (old_dir_entry)
997 f2fs_put_page(old_dir_page, 0);
998 out_old:
999 f2fs_put_page(old_page, 0);
1000 out:
1001 return err;
1002 }
1003
1004 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1005 struct inode *new_dir, struct dentry *new_dentry)
1006 {
1007 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1008 struct inode *old_inode = d_inode(old_dentry);
1009 struct inode *new_inode = d_inode(new_dentry);
1010 struct page *old_dir_page, *new_dir_page;
1011 struct page *old_page, *new_page;
1012 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1013 struct f2fs_dir_entry *old_entry, *new_entry;
1014 int old_nlink = 0, new_nlink = 0;
1015 int err = -ENOENT;
1016
1017 if (unlikely(f2fs_cp_error(sbi)))
1018 return -EIO;
1019
1020 if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1021 !projid_eq(F2FS_I(new_dir)->i_projid,
1022 F2FS_I(old_dentry->d_inode)->i_projid)) ||
1023 (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1024 !projid_eq(F2FS_I(old_dir)->i_projid,
1025 F2FS_I(new_dentry->d_inode)->i_projid)))
1026 return -EXDEV;
1027
1028 err = dquot_initialize(old_dir);
1029 if (err)
1030 goto out;
1031
1032 err = dquot_initialize(new_dir);
1033 if (err)
1034 goto out;
1035
1036 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1037 if (!old_entry) {
1038 if (IS_ERR(old_page))
1039 err = PTR_ERR(old_page);
1040 goto out;
1041 }
1042
1043 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1044 if (!new_entry) {
1045 if (IS_ERR(new_page))
1046 err = PTR_ERR(new_page);
1047 goto out_old;
1048 }
1049
1050 /* prepare for updating ".." directory entry info later */
1051 if (old_dir != new_dir) {
1052 if (S_ISDIR(old_inode->i_mode)) {
1053 old_dir_entry = f2fs_parent_dir(old_inode,
1054 &old_dir_page);
1055 if (!old_dir_entry) {
1056 if (IS_ERR(old_dir_page))
1057 err = PTR_ERR(old_dir_page);
1058 goto out_new;
1059 }
1060 }
1061
1062 if (S_ISDIR(new_inode->i_mode)) {
1063 new_dir_entry = f2fs_parent_dir(new_inode,
1064 &new_dir_page);
1065 if (!new_dir_entry) {
1066 if (IS_ERR(new_dir_page))
1067 err = PTR_ERR(new_dir_page);
1068 goto out_old_dir;
1069 }
1070 }
1071 }
1072
1073 /*
1074 * If cross rename between file and directory those are not
1075 * in the same directory, we will inc nlink of file's parent
1076 * later, so we should check upper boundary of its nlink.
1077 */
1078 if ((!old_dir_entry || !new_dir_entry) &&
1079 old_dir_entry != new_dir_entry) {
1080 old_nlink = old_dir_entry ? -1 : 1;
1081 new_nlink = -old_nlink;
1082 err = -EMLINK;
1083 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1084 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1085 goto out_new_dir;
1086 }
1087
1088 f2fs_balance_fs(sbi, true);
1089
1090 f2fs_lock_op(sbi);
1091
1092 /* update ".." directory entry info of old dentry */
1093 if (old_dir_entry)
1094 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1095
1096 /* update ".." directory entry info of new dentry */
1097 if (new_dir_entry)
1098 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1099
1100 /* update directory entry info of old dir inode */
1101 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1102
1103 down_write(&F2FS_I(old_inode)->i_sem);
1104 file_lost_pino(old_inode);
1105 up_write(&F2FS_I(old_inode)->i_sem);
1106
1107 old_dir->i_ctime = current_time(old_dir);
1108 if (old_nlink) {
1109 down_write(&F2FS_I(old_dir)->i_sem);
1110 f2fs_i_links_write(old_dir, old_nlink > 0);
1111 up_write(&F2FS_I(old_dir)->i_sem);
1112 }
1113 f2fs_mark_inode_dirty_sync(old_dir, false);
1114
1115 /* update directory entry info of new dir inode */
1116 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1117
1118 down_write(&F2FS_I(new_inode)->i_sem);
1119 file_lost_pino(new_inode);
1120 up_write(&F2FS_I(new_inode)->i_sem);
1121
1122 new_dir->i_ctime = current_time(new_dir);
1123 if (new_nlink) {
1124 down_write(&F2FS_I(new_dir)->i_sem);
1125 f2fs_i_links_write(new_dir, new_nlink > 0);
1126 up_write(&F2FS_I(new_dir)->i_sem);
1127 }
1128 f2fs_mark_inode_dirty_sync(new_dir, false);
1129
1130 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1131 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1132 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1133 }
1134
1135 f2fs_unlock_op(sbi);
1136
1137 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1138 f2fs_sync_fs(sbi->sb, 1);
1139 return 0;
1140 out_new_dir:
1141 if (new_dir_entry) {
1142 f2fs_put_page(new_dir_page, 0);
1143 }
1144 out_old_dir:
1145 if (old_dir_entry) {
1146 f2fs_put_page(old_dir_page, 0);
1147 }
1148 out_new:
1149 f2fs_put_page(new_page, 0);
1150 out_old:
1151 f2fs_put_page(old_page, 0);
1152 out:
1153 return err;
1154 }
1155
1156 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1157 struct inode *new_dir, struct dentry *new_dentry,
1158 unsigned int flags)
1159 {
1160 int err;
1161
1162 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1163 return -EINVAL;
1164
1165 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1166 flags);
1167 if (err)
1168 return err;
1169
1170 if (flags & RENAME_EXCHANGE) {
1171 return f2fs_cross_rename(old_dir, old_dentry,
1172 new_dir, new_dentry);
1173 }
1174 /*
1175 * VFS has already handled the new dentry existence case,
1176 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1177 */
1178 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1179 }
1180
1181 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1182 struct inode *inode,
1183 struct delayed_call *done)
1184 {
1185 struct page *page;
1186 const char *target;
1187
1188 if (!dentry)
1189 return ERR_PTR(-ECHILD);
1190
1191 page = read_mapping_page(inode->i_mapping, 0, NULL);
1192 if (IS_ERR(page))
1193 return ERR_CAST(page);
1194
1195 target = fscrypt_get_symlink(inode, page_address(page),
1196 inode->i_sb->s_blocksize, done);
1197 put_page(page);
1198 return target;
1199 }
1200
1201 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1202 .get_link = f2fs_encrypted_get_link,
1203 .getattr = f2fs_getattr,
1204 .setattr = f2fs_setattr,
1205 #ifdef CONFIG_F2FS_FS_XATTR
1206 .listxattr = f2fs_listxattr,
1207 #endif
1208 };
1209
1210 const struct inode_operations f2fs_dir_inode_operations = {
1211 .create = f2fs_create,
1212 .lookup = f2fs_lookup,
1213 .link = f2fs_link,
1214 .unlink = f2fs_unlink,
1215 .symlink = f2fs_symlink,
1216 .mkdir = f2fs_mkdir,
1217 .rmdir = f2fs_rmdir,
1218 .mknod = f2fs_mknod,
1219 .rename = f2fs_rename2,
1220 .tmpfile = f2fs_tmpfile,
1221 .getattr = f2fs_getattr,
1222 .setattr = f2fs_setattr,
1223 .get_acl = f2fs_get_acl,
1224 .set_acl = f2fs_set_acl,
1225 #ifdef CONFIG_F2FS_FS_XATTR
1226 .listxattr = f2fs_listxattr,
1227 #endif
1228 };
1229
1230 const struct inode_operations f2fs_symlink_inode_operations = {
1231 .get_link = f2fs_get_link,
1232 .getattr = f2fs_getattr,
1233 .setattr = f2fs_setattr,
1234 #ifdef CONFIG_F2FS_FS_XATTR
1235 .listxattr = f2fs_listxattr,
1236 #endif
1237 };
1238
1239 const struct inode_operations f2fs_special_inode_operations = {
1240 .getattr = f2fs_getattr,
1241 .setattr = f2fs_setattr,
1242 .get_acl = f2fs_get_acl,
1243 .set_acl = f2fs_set_acl,
1244 #ifdef CONFIG_F2FS_FS_XATTR
1245 .listxattr = f2fs_listxattr,
1246 #endif
1247 };
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