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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * fs/f2fs/namei.c
4 *
5 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
6 * http://www.samsung.com/
7 */
8#include <linux/fs.h>
9#include <linux/f2fs_fs.h>
10#include <linux/pagemap.h>
11#include <linux/sched.h>
12#include <linux/ctype.h>
13#include <linux/random.h>
14#include <linux/dcache.h>
15#include <linux/namei.h>
16#include <linux/quotaops.h>
17
18#include "f2fs.h"
19#include "node.h"
20#include "segment.h"
21#include "xattr.h"
22#include "acl.h"
23#include <trace/events/f2fs.h>
24
25static 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 xattr_size = 0;
32 int err;
33
34 inode = new_inode(dir->i_sb);
35 if (!inode)
36 return ERR_PTR(-ENOMEM);
37
38 f2fs_lock_op(sbi);
39 if (!f2fs_alloc_nid(sbi, &ino)) {
40 f2fs_unlock_op(sbi);
41 err = -ENOSPC;
42 goto fail;
43 }
44 f2fs_unlock_op(sbi);
45
46 nid_free = true;
47
48 inode_init_owner(inode, dir, mode);
49
50 inode->i_ino = ino;
51 inode->i_blocks = 0;
52 inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
53 F2FS_I(inode)->i_crtime = inode->i_mtime;
54 inode->i_generation = prandom_u32();
55
56 if (S_ISDIR(inode->i_mode))
57 F2FS_I(inode)->i_current_depth = 1;
58
59 err = insert_inode_locked(inode);
60 if (err) {
61 err = -EINVAL;
62 goto fail;
63 }
64
65 if (f2fs_sb_has_project_quota(sbi) &&
66 (F2FS_I(dir)->i_flags & F2FS_PROJINHERIT_FL))
67 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
68 else
69 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
70 F2FS_DEF_PROJID);
71
72 err = dquot_initialize(inode);
73 if (err)
74 goto fail_drop;
75
76 set_inode_flag(inode, FI_NEW_INODE);
77
78 /* If the directory encrypted, then we should encrypt the inode. */
79 if ((IS_ENCRYPTED(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
80 f2fs_may_encrypt(inode))
81 f2fs_set_encrypted_inode(inode);
82
83 if (f2fs_sb_has_extra_attr(sbi)) {
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)) {
97 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
98 if (f2fs_has_inline_xattr(inode))
99 xattr_size = F2FS_OPTION(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 |= F2FS_INDEX_FL;
118
119 if (F2FS_I(inode)->i_flags & F2FS_PROJINHERIT_FL)
120 set_inode_flag(inode, FI_PROJ_INHERIT);
121
122 f2fs_set_inode_flags(inode);
123
124 trace_f2fs_new_inode(inode, 0);
125 return inode;
126
127fail:
128 trace_f2fs_new_inode(inode, err);
129 make_bad_inode(inode);
130 if (nid_free)
131 set_inode_flag(inode, FI_FREE_NID);
132 iput(inode);
133 return ERR_PTR(err);
134fail_drop:
135 trace_f2fs_new_inode(inode, err);
136 dquot_drop(inode);
137 inode->i_flags |= S_NOQUOTA;
138 if (nid_free)
139 set_inode_flag(inode, FI_FREE_NID);
140 clear_nlink(inode);
141 unlock_new_inode(inode);
142 iput(inode);
143 return ERR_PTR(err);
144}
145
146static inline int is_extension_exist(const unsigned char *s, const char *sub)
147{
148 size_t slen = strlen(s);
149 size_t sublen = strlen(sub);
150 int i;
151
152 /*
153 * filename format of multimedia file should be defined as:
154 * "filename + '.' + extension + (optional: '.' + temp extension)".
155 */
156 if (slen < sublen + 2)
157 return 0;
158
159 for (i = 1; i < slen - sublen; i++) {
160 if (s[i] != '.')
161 continue;
162 if (!strncasecmp(s + i + 1, sub, sublen))
163 return 1;
164 }
165
166 return 0;
167}
168
169/*
170 * Set multimedia files as cold files for hot/cold data separation
171 */
172static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
173 const unsigned char *name)
174{
175 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
176 int i, cold_count, hot_count;
177
178 down_read(&sbi->sb_lock);
179
180 cold_count = le32_to_cpu(sbi->raw_super->extension_count);
181 hot_count = sbi->raw_super->hot_ext_count;
182
183 for (i = 0; i < cold_count + hot_count; i++) {
184 if (is_extension_exist(name, extlist[i]))
185 break;
186 }
187
188 up_read(&sbi->sb_lock);
189
190 if (i == cold_count + hot_count)
191 return;
192
193 if (i < cold_count)
194 file_set_cold(inode);
195 else
196 file_set_hot(inode);
197}
198
199int 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
265static 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 if (!f2fs_is_checkpoint_ready(sbi))
276 return -ENOSPC;
277
278 err = dquot_initialize(dir);
279 if (err)
280 return err;
281
282 inode = f2fs_new_inode(dir, mode);
283 if (IS_ERR(inode))
284 return PTR_ERR(inode);
285
286 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
287 set_file_temperature(sbi, inode, dentry->d_name.name);
288
289 inode->i_op = &f2fs_file_inode_operations;
290 inode->i_fop = &f2fs_file_operations;
291 inode->i_mapping->a_ops = &f2fs_dblock_aops;
292 ino = inode->i_ino;
293
294 f2fs_lock_op(sbi);
295 err = f2fs_add_link(dentry, inode);
296 if (err)
297 goto out;
298 f2fs_unlock_op(sbi);
299
300 f2fs_alloc_nid_done(sbi, ino);
301
302 d_instantiate_new(dentry, inode);
303
304 if (IS_DIRSYNC(dir))
305 f2fs_sync_fs(sbi->sb, 1);
306
307 f2fs_balance_fs(sbi, true);
308 return 0;
309out:
310 f2fs_handle_failed_inode(inode);
311 return err;
312}
313
314static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
315 struct dentry *dentry)
316{
317 struct inode *inode = d_inode(old_dentry);
318 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
319 int err;
320
321 if (unlikely(f2fs_cp_error(sbi)))
322 return -EIO;
323 if (!f2fs_is_checkpoint_ready(sbi))
324 return -ENOSPC;
325
326 err = fscrypt_prepare_link(old_dentry, dir, dentry);
327 if (err)
328 return err;
329
330 if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
331 (!projid_eq(F2FS_I(dir)->i_projid,
332 F2FS_I(old_dentry->d_inode)->i_projid)))
333 return -EXDEV;
334
335 err = dquot_initialize(dir);
336 if (err)
337 return err;
338
339 f2fs_balance_fs(sbi, true);
340
341 inode->i_ctime = current_time(inode);
342 ihold(inode);
343
344 set_inode_flag(inode, FI_INC_LINK);
345 f2fs_lock_op(sbi);
346 err = f2fs_add_link(dentry, inode);
347 if (err)
348 goto out;
349 f2fs_unlock_op(sbi);
350
351 d_instantiate(dentry, inode);
352
353 if (IS_DIRSYNC(dir))
354 f2fs_sync_fs(sbi->sb, 1);
355 return 0;
356out:
357 clear_inode_flag(inode, FI_INC_LINK);
358 iput(inode);
359 f2fs_unlock_op(sbi);
360 return err;
361}
362
363struct dentry *f2fs_get_parent(struct dentry *child)
364{
365 struct qstr dotdot = QSTR_INIT("..", 2);
366 struct page *page;
367 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
368 if (!ino) {
369 if (IS_ERR(page))
370 return ERR_CAST(page);
371 return ERR_PTR(-ENOENT);
372 }
373 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
374}
375
376static int __recover_dot_dentries(struct inode *dir, nid_t pino)
377{
378 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
379 struct qstr dot = QSTR_INIT(".", 1);
380 struct qstr dotdot = QSTR_INIT("..", 2);
381 struct f2fs_dir_entry *de;
382 struct page *page;
383 int err = 0;
384
385 if (f2fs_readonly(sbi->sb)) {
386 f2fs_info(sbi, "skip recovering inline_dots inode (ino:%lu, pino:%u) in readonly mountpoint",
387 dir->i_ino, pino);
388 return 0;
389 }
390
391 err = dquot_initialize(dir);
392 if (err)
393 return err;
394
395 f2fs_balance_fs(sbi, true);
396
397 f2fs_lock_op(sbi);
398
399 de = f2fs_find_entry(dir, &dot, &page);
400 if (de) {
401 f2fs_put_page(page, 0);
402 } else if (IS_ERR(page)) {
403 err = PTR_ERR(page);
404 goto out;
405 } else {
406 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
407 if (err)
408 goto out;
409 }
410
411 de = f2fs_find_entry(dir, &dotdot, &page);
412 if (de)
413 f2fs_put_page(page, 0);
414 else if (IS_ERR(page))
415 err = PTR_ERR(page);
416 else
417 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
418out:
419 if (!err)
420 clear_inode_flag(dir, FI_INLINE_DOTS);
421
422 f2fs_unlock_op(sbi);
423 return err;
424}
425
426static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
427 unsigned int flags)
428{
429 struct inode *inode = NULL;
430 struct f2fs_dir_entry *de;
431 struct page *page;
432 struct dentry *new;
433 nid_t ino = -1;
434 int err = 0;
435 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
436 struct fscrypt_name fname;
437
438 trace_f2fs_lookup_start(dir, dentry, flags);
439
440 if (dentry->d_name.len > F2FS_NAME_LEN) {
441 err = -ENAMETOOLONG;
442 goto out;
443 }
444
445 err = fscrypt_prepare_lookup(dir, dentry, &fname);
446 if (err == -ENOENT)
447 goto out_splice;
448 if (err)
449 goto out;
450 de = __f2fs_find_entry(dir, &fname, &page);
451 fscrypt_free_filename(&fname);
452
453 if (!de) {
454 if (IS_ERR(page)) {
455 err = PTR_ERR(page);
456 goto out;
457 }
458 goto out_splice;
459 }
460
461 ino = le32_to_cpu(de->ino);
462 f2fs_put_page(page, 0);
463
464 inode = f2fs_iget(dir->i_sb, ino);
465 if (IS_ERR(inode)) {
466 err = PTR_ERR(inode);
467 goto out;
468 }
469
470 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
471 err = __recover_dot_dentries(dir, root_ino);
472 if (err)
473 goto out_iput;
474 }
475
476 if (f2fs_has_inline_dots(inode)) {
477 err = __recover_dot_dentries(inode, dir->i_ino);
478 if (err)
479 goto out_iput;
480 }
481 if (IS_ENCRYPTED(dir) &&
482 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
483 !fscrypt_has_permitted_context(dir, inode)) {
484 f2fs_warn(F2FS_I_SB(inode), "Inconsistent encryption contexts: %lu/%lu",
485 dir->i_ino, inode->i_ino);
486 err = -EPERM;
487 goto out_iput;
488 }
489out_splice:
490#ifdef CONFIG_UNICODE
491 if (!inode && IS_CASEFOLDED(dir)) {
492 /* Eventually we want to call d_add_ci(dentry, NULL)
493 * for negative dentries in the encoding case as
494 * well. For now, prevent the negative dentry
495 * from being cached.
496 */
497 trace_f2fs_lookup_end(dir, dentry, ino, err);
498 return NULL;
499 }
500#endif
501 new = d_splice_alias(inode, dentry);
502 err = PTR_ERR_OR_ZERO(new);
503 trace_f2fs_lookup_end(dir, dentry, ino, err);
504 return new;
505out_iput:
506 iput(inode);
507out:
508 trace_f2fs_lookup_end(dir, dentry, ino, err);
509 return ERR_PTR(err);
510}
511
512static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
513{
514 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
515 struct inode *inode = d_inode(dentry);
516 struct f2fs_dir_entry *de;
517 struct page *page;
518 int err = -ENOENT;
519
520 trace_f2fs_unlink_enter(dir, dentry);
521
522 if (unlikely(f2fs_cp_error(sbi)))
523 return -EIO;
524
525 err = dquot_initialize(dir);
526 if (err)
527 return err;
528 err = dquot_initialize(inode);
529 if (err)
530 return err;
531
532 de = f2fs_find_entry(dir, &dentry->d_name, &page);
533 if (!de) {
534 if (IS_ERR(page))
535 err = PTR_ERR(page);
536 goto fail;
537 }
538
539 f2fs_balance_fs(sbi, true);
540
541 f2fs_lock_op(sbi);
542 err = f2fs_acquire_orphan_inode(sbi);
543 if (err) {
544 f2fs_unlock_op(sbi);
545 f2fs_put_page(page, 0);
546 goto fail;
547 }
548 f2fs_delete_entry(de, page, dir, inode);
549#ifdef CONFIG_UNICODE
550 /* VFS negative dentries are incompatible with Encoding and
551 * Case-insensitiveness. Eventually we'll want avoid
552 * invalidating the dentries here, alongside with returning the
553 * negative dentries at f2fs_lookup(), when it is better
554 * supported by the VFS for the CI case.
555 */
556 if (IS_CASEFOLDED(dir))
557 d_invalidate(dentry);
558#endif
559 f2fs_unlock_op(sbi);
560
561 if (IS_DIRSYNC(dir))
562 f2fs_sync_fs(sbi->sb, 1);
563fail:
564 trace_f2fs_unlink_exit(inode, err);
565 return err;
566}
567
568static const char *f2fs_get_link(struct dentry *dentry,
569 struct inode *inode,
570 struct delayed_call *done)
571{
572 const char *link = page_get_link(dentry, inode, done);
573 if (!IS_ERR(link) && !*link) {
574 /* this is broken symlink case */
575 do_delayed_call(done);
576 clear_delayed_call(done);
577 link = ERR_PTR(-ENOENT);
578 }
579 return link;
580}
581
582static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
583 const char *symname)
584{
585 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
586 struct inode *inode;
587 size_t len = strlen(symname);
588 struct fscrypt_str disk_link;
589 int err;
590
591 if (unlikely(f2fs_cp_error(sbi)))
592 return -EIO;
593 if (!f2fs_is_checkpoint_ready(sbi))
594 return -ENOSPC;
595
596 err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
597 &disk_link);
598 if (err)
599 return err;
600
601 err = dquot_initialize(dir);
602 if (err)
603 return err;
604
605 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
606 if (IS_ERR(inode))
607 return PTR_ERR(inode);
608
609 if (IS_ENCRYPTED(inode))
610 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
611 else
612 inode->i_op = &f2fs_symlink_inode_operations;
613 inode_nohighmem(inode);
614 inode->i_mapping->a_ops = &f2fs_dblock_aops;
615
616 f2fs_lock_op(sbi);
617 err = f2fs_add_link(dentry, inode);
618 if (err)
619 goto out_f2fs_handle_failed_inode;
620 f2fs_unlock_op(sbi);
621 f2fs_alloc_nid_done(sbi, inode->i_ino);
622
623 err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
624 if (err)
625 goto err_out;
626
627 err = page_symlink(inode, disk_link.name, disk_link.len);
628
629err_out:
630 d_instantiate_new(dentry, inode);
631
632 /*
633 * Let's flush symlink data in order to avoid broken symlink as much as
634 * possible. Nevertheless, fsyncing is the best way, but there is no
635 * way to get a file descriptor in order to flush that.
636 *
637 * Note that, it needs to do dir->fsync to make this recoverable.
638 * If the symlink path is stored into inline_data, there is no
639 * performance regression.
640 */
641 if (!err) {
642 filemap_write_and_wait_range(inode->i_mapping, 0,
643 disk_link.len - 1);
644
645 if (IS_DIRSYNC(dir))
646 f2fs_sync_fs(sbi->sb, 1);
647 } else {
648 f2fs_unlink(dir, dentry);
649 }
650
651 f2fs_balance_fs(sbi, true);
652 goto out_free_encrypted_link;
653
654out_f2fs_handle_failed_inode:
655 f2fs_handle_failed_inode(inode);
656out_free_encrypted_link:
657 if (disk_link.name != (unsigned char *)symname)
658 kvfree(disk_link.name);
659 return err;
660}
661
662static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
663{
664 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
665 struct inode *inode;
666 int err;
667
668 if (unlikely(f2fs_cp_error(sbi)))
669 return -EIO;
670
671 err = dquot_initialize(dir);
672 if (err)
673 return err;
674
675 inode = f2fs_new_inode(dir, S_IFDIR | mode);
676 if (IS_ERR(inode))
677 return PTR_ERR(inode);
678
679 inode->i_op = &f2fs_dir_inode_operations;
680 inode->i_fop = &f2fs_dir_operations;
681 inode->i_mapping->a_ops = &f2fs_dblock_aops;
682 inode_nohighmem(inode);
683
684 set_inode_flag(inode, FI_INC_LINK);
685 f2fs_lock_op(sbi);
686 err = f2fs_add_link(dentry, inode);
687 if (err)
688 goto out_fail;
689 f2fs_unlock_op(sbi);
690
691 f2fs_alloc_nid_done(sbi, inode->i_ino);
692
693 d_instantiate_new(dentry, inode);
694
695 if (IS_DIRSYNC(dir))
696 f2fs_sync_fs(sbi->sb, 1);
697
698 f2fs_balance_fs(sbi, true);
699 return 0;
700
701out_fail:
702 clear_inode_flag(inode, FI_INC_LINK);
703 f2fs_handle_failed_inode(inode);
704 return err;
705}
706
707static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
708{
709 struct inode *inode = d_inode(dentry);
710 if (f2fs_empty_dir(inode))
711 return f2fs_unlink(dir, dentry);
712 return -ENOTEMPTY;
713}
714
715static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
716 umode_t mode, dev_t rdev)
717{
718 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
719 struct inode *inode;
720 int err = 0;
721
722 if (unlikely(f2fs_cp_error(sbi)))
723 return -EIO;
724 if (!f2fs_is_checkpoint_ready(sbi))
725 return -ENOSPC;
726
727 err = dquot_initialize(dir);
728 if (err)
729 return err;
730
731 inode = f2fs_new_inode(dir, mode);
732 if (IS_ERR(inode))
733 return PTR_ERR(inode);
734
735 init_special_inode(inode, inode->i_mode, rdev);
736 inode->i_op = &f2fs_special_inode_operations;
737
738 f2fs_lock_op(sbi);
739 err = f2fs_add_link(dentry, inode);
740 if (err)
741 goto out;
742 f2fs_unlock_op(sbi);
743
744 f2fs_alloc_nid_done(sbi, inode->i_ino);
745
746 d_instantiate_new(dentry, inode);
747
748 if (IS_DIRSYNC(dir))
749 f2fs_sync_fs(sbi->sb, 1);
750
751 f2fs_balance_fs(sbi, true);
752 return 0;
753out:
754 f2fs_handle_failed_inode(inode);
755 return err;
756}
757
758static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
759 umode_t mode, struct inode **whiteout)
760{
761 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
762 struct inode *inode;
763 int err;
764
765 err = dquot_initialize(dir);
766 if (err)
767 return err;
768
769 inode = f2fs_new_inode(dir, mode);
770 if (IS_ERR(inode))
771 return PTR_ERR(inode);
772
773 if (whiteout) {
774 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
775 inode->i_op = &f2fs_special_inode_operations;
776 } else {
777 inode->i_op = &f2fs_file_inode_operations;
778 inode->i_fop = &f2fs_file_operations;
779 inode->i_mapping->a_ops = &f2fs_dblock_aops;
780 }
781
782 f2fs_lock_op(sbi);
783 err = f2fs_acquire_orphan_inode(sbi);
784 if (err)
785 goto out;
786
787 err = f2fs_do_tmpfile(inode, dir);
788 if (err)
789 goto release_out;
790
791 /*
792 * add this non-linked tmpfile to orphan list, in this way we could
793 * remove all unused data of tmpfile after abnormal power-off.
794 */
795 f2fs_add_orphan_inode(inode);
796 f2fs_alloc_nid_done(sbi, inode->i_ino);
797
798 if (whiteout) {
799 f2fs_i_links_write(inode, false);
800 *whiteout = inode;
801 } else {
802 d_tmpfile(dentry, inode);
803 }
804 /* link_count was changed by d_tmpfile as well. */
805 f2fs_unlock_op(sbi);
806 unlock_new_inode(inode);
807
808 f2fs_balance_fs(sbi, true);
809 return 0;
810
811release_out:
812 f2fs_release_orphan_inode(sbi);
813out:
814 f2fs_handle_failed_inode(inode);
815 return err;
816}
817
818static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
819{
820 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
821
822 if (unlikely(f2fs_cp_error(sbi)))
823 return -EIO;
824 if (!f2fs_is_checkpoint_ready(sbi))
825 return -ENOSPC;
826
827 if (IS_ENCRYPTED(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
828 int err = fscrypt_get_encryption_info(dir);
829 if (err)
830 return err;
831 }
832
833 return __f2fs_tmpfile(dir, dentry, mode, NULL);
834}
835
836static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
837{
838 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
839 return -EIO;
840
841 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
842}
843
844static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
845 struct inode *new_dir, struct dentry *new_dentry,
846 unsigned int flags)
847{
848 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
849 struct inode *old_inode = d_inode(old_dentry);
850 struct inode *new_inode = d_inode(new_dentry);
851 struct inode *whiteout = NULL;
852 struct page *old_dir_page;
853 struct page *old_page, *new_page = NULL;
854 struct f2fs_dir_entry *old_dir_entry = NULL;
855 struct f2fs_dir_entry *old_entry;
856 struct f2fs_dir_entry *new_entry;
857 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
858 int err;
859
860 if (unlikely(f2fs_cp_error(sbi)))
861 return -EIO;
862 if (!f2fs_is_checkpoint_ready(sbi))
863 return -ENOSPC;
864
865 if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
866 (!projid_eq(F2FS_I(new_dir)->i_projid,
867 F2FS_I(old_dentry->d_inode)->i_projid)))
868 return -EXDEV;
869
870 err = dquot_initialize(old_dir);
871 if (err)
872 goto out;
873
874 err = dquot_initialize(new_dir);
875 if (err)
876 goto out;
877
878 if (new_inode) {
879 err = dquot_initialize(new_inode);
880 if (err)
881 goto out;
882 }
883
884 err = -ENOENT;
885 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
886 if (!old_entry) {
887 if (IS_ERR(old_page))
888 err = PTR_ERR(old_page);
889 goto out;
890 }
891
892 if (S_ISDIR(old_inode->i_mode)) {
893 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
894 if (!old_dir_entry) {
895 if (IS_ERR(old_dir_page))
896 err = PTR_ERR(old_dir_page);
897 goto out_old;
898 }
899 }
900
901 if (flags & RENAME_WHITEOUT) {
902 err = f2fs_create_whiteout(old_dir, &whiteout);
903 if (err)
904 goto out_dir;
905 }
906
907 if (new_inode) {
908
909 err = -ENOTEMPTY;
910 if (old_dir_entry && !f2fs_empty_dir(new_inode))
911 goto out_whiteout;
912
913 err = -ENOENT;
914 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
915 &new_page);
916 if (!new_entry) {
917 if (IS_ERR(new_page))
918 err = PTR_ERR(new_page);
919 goto out_whiteout;
920 }
921
922 f2fs_balance_fs(sbi, true);
923
924 f2fs_lock_op(sbi);
925
926 err = f2fs_acquire_orphan_inode(sbi);
927 if (err)
928 goto put_out_dir;
929
930 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
931
932 new_inode->i_ctime = current_time(new_inode);
933 down_write(&F2FS_I(new_inode)->i_sem);
934 if (old_dir_entry)
935 f2fs_i_links_write(new_inode, false);
936 f2fs_i_links_write(new_inode, false);
937 up_write(&F2FS_I(new_inode)->i_sem);
938
939 if (!new_inode->i_nlink)
940 f2fs_add_orphan_inode(new_inode);
941 else
942 f2fs_release_orphan_inode(sbi);
943 } else {
944 f2fs_balance_fs(sbi, true);
945
946 f2fs_lock_op(sbi);
947
948 err = f2fs_add_link(new_dentry, old_inode);
949 if (err) {
950 f2fs_unlock_op(sbi);
951 goto out_whiteout;
952 }
953
954 if (old_dir_entry)
955 f2fs_i_links_write(new_dir, true);
956
957 /*
958 * old entry and new entry can locate in the same inline
959 * dentry in inode, when attaching new entry in inline dentry,
960 * it could force inline dentry conversion, after that,
961 * old_entry and old_page will point to wrong address, in
962 * order to avoid this, let's do the check and update here.
963 */
964 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
965 f2fs_put_page(old_page, 0);
966 old_page = NULL;
967
968 old_entry = f2fs_find_entry(old_dir,
969 &old_dentry->d_name, &old_page);
970 if (!old_entry) {
971 err = -ENOENT;
972 if (IS_ERR(old_page))
973 err = PTR_ERR(old_page);
974 f2fs_unlock_op(sbi);
975 goto out_whiteout;
976 }
977 }
978 }
979
980 down_write(&F2FS_I(old_inode)->i_sem);
981 if (!old_dir_entry || whiteout)
982 file_lost_pino(old_inode);
983 else
984 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
985 up_write(&F2FS_I(old_inode)->i_sem);
986
987 old_inode->i_ctime = current_time(old_inode);
988 f2fs_mark_inode_dirty_sync(old_inode, false);
989
990 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
991
992 if (whiteout) {
993 whiteout->i_state |= I_LINKABLE;
994 set_inode_flag(whiteout, FI_INC_LINK);
995 err = f2fs_add_link(old_dentry, whiteout);
996 if (err)
997 goto put_out_dir;
998 whiteout->i_state &= ~I_LINKABLE;
999 iput(whiteout);
1000 }
1001
1002 if (old_dir_entry) {
1003 if (old_dir != new_dir && !whiteout)
1004 f2fs_set_link(old_inode, old_dir_entry,
1005 old_dir_page, new_dir);
1006 else
1007 f2fs_put_page(old_dir_page, 0);
1008 f2fs_i_links_write(old_dir, false);
1009 }
1010 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1011 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1012 if (S_ISDIR(old_inode->i_mode))
1013 f2fs_add_ino_entry(sbi, old_inode->i_ino,
1014 TRANS_DIR_INO);
1015 }
1016
1017 f2fs_unlock_op(sbi);
1018
1019 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1020 f2fs_sync_fs(sbi->sb, 1);
1021
1022 f2fs_update_time(sbi, REQ_TIME);
1023 return 0;
1024
1025put_out_dir:
1026 f2fs_unlock_op(sbi);
1027 if (new_page)
1028 f2fs_put_page(new_page, 0);
1029out_whiteout:
1030 if (whiteout)
1031 iput(whiteout);
1032out_dir:
1033 if (old_dir_entry)
1034 f2fs_put_page(old_dir_page, 0);
1035out_old:
1036 f2fs_put_page(old_page, 0);
1037out:
1038 return err;
1039}
1040
1041static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1042 struct inode *new_dir, struct dentry *new_dentry)
1043{
1044 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1045 struct inode *old_inode = d_inode(old_dentry);
1046 struct inode *new_inode = d_inode(new_dentry);
1047 struct page *old_dir_page, *new_dir_page;
1048 struct page *old_page, *new_page;
1049 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1050 struct f2fs_dir_entry *old_entry, *new_entry;
1051 int old_nlink = 0, new_nlink = 0;
1052 int err;
1053
1054 if (unlikely(f2fs_cp_error(sbi)))
1055 return -EIO;
1056 if (!f2fs_is_checkpoint_ready(sbi))
1057 return -ENOSPC;
1058
1059 if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1060 !projid_eq(F2FS_I(new_dir)->i_projid,
1061 F2FS_I(old_dentry->d_inode)->i_projid)) ||
1062 (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1063 !projid_eq(F2FS_I(old_dir)->i_projid,
1064 F2FS_I(new_dentry->d_inode)->i_projid)))
1065 return -EXDEV;
1066
1067 err = dquot_initialize(old_dir);
1068 if (err)
1069 goto out;
1070
1071 err = dquot_initialize(new_dir);
1072 if (err)
1073 goto out;
1074
1075 err = -ENOENT;
1076 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1077 if (!old_entry) {
1078 if (IS_ERR(old_page))
1079 err = PTR_ERR(old_page);
1080 goto out;
1081 }
1082
1083 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1084 if (!new_entry) {
1085 if (IS_ERR(new_page))
1086 err = PTR_ERR(new_page);
1087 goto out_old;
1088 }
1089
1090 /* prepare for updating ".." directory entry info later */
1091 if (old_dir != new_dir) {
1092 if (S_ISDIR(old_inode->i_mode)) {
1093 old_dir_entry = f2fs_parent_dir(old_inode,
1094 &old_dir_page);
1095 if (!old_dir_entry) {
1096 if (IS_ERR(old_dir_page))
1097 err = PTR_ERR(old_dir_page);
1098 goto out_new;
1099 }
1100 }
1101
1102 if (S_ISDIR(new_inode->i_mode)) {
1103 new_dir_entry = f2fs_parent_dir(new_inode,
1104 &new_dir_page);
1105 if (!new_dir_entry) {
1106 if (IS_ERR(new_dir_page))
1107 err = PTR_ERR(new_dir_page);
1108 goto out_old_dir;
1109 }
1110 }
1111 }
1112
1113 /*
1114 * If cross rename between file and directory those are not
1115 * in the same directory, we will inc nlink of file's parent
1116 * later, so we should check upper boundary of its nlink.
1117 */
1118 if ((!old_dir_entry || !new_dir_entry) &&
1119 old_dir_entry != new_dir_entry) {
1120 old_nlink = old_dir_entry ? -1 : 1;
1121 new_nlink = -old_nlink;
1122 err = -EMLINK;
1123 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1124 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1125 goto out_new_dir;
1126 }
1127
1128 f2fs_balance_fs(sbi, true);
1129
1130 f2fs_lock_op(sbi);
1131
1132 /* update ".." directory entry info of old dentry */
1133 if (old_dir_entry)
1134 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1135
1136 /* update ".." directory entry info of new dentry */
1137 if (new_dir_entry)
1138 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1139
1140 /* update directory entry info of old dir inode */
1141 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1142
1143 down_write(&F2FS_I(old_inode)->i_sem);
1144 file_lost_pino(old_inode);
1145 up_write(&F2FS_I(old_inode)->i_sem);
1146
1147 old_dir->i_ctime = current_time(old_dir);
1148 if (old_nlink) {
1149 down_write(&F2FS_I(old_dir)->i_sem);
1150 f2fs_i_links_write(old_dir, old_nlink > 0);
1151 up_write(&F2FS_I(old_dir)->i_sem);
1152 }
1153 f2fs_mark_inode_dirty_sync(old_dir, false);
1154
1155 /* update directory entry info of new dir inode */
1156 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1157
1158 down_write(&F2FS_I(new_inode)->i_sem);
1159 file_lost_pino(new_inode);
1160 up_write(&F2FS_I(new_inode)->i_sem);
1161
1162 new_dir->i_ctime = current_time(new_dir);
1163 if (new_nlink) {
1164 down_write(&F2FS_I(new_dir)->i_sem);
1165 f2fs_i_links_write(new_dir, new_nlink > 0);
1166 up_write(&F2FS_I(new_dir)->i_sem);
1167 }
1168 f2fs_mark_inode_dirty_sync(new_dir, false);
1169
1170 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1171 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1172 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1173 }
1174
1175 f2fs_unlock_op(sbi);
1176
1177 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1178 f2fs_sync_fs(sbi->sb, 1);
1179
1180 f2fs_update_time(sbi, REQ_TIME);
1181 return 0;
1182out_new_dir:
1183 if (new_dir_entry) {
1184 f2fs_put_page(new_dir_page, 0);
1185 }
1186out_old_dir:
1187 if (old_dir_entry) {
1188 f2fs_put_page(old_dir_page, 0);
1189 }
1190out_new:
1191 f2fs_put_page(new_page, 0);
1192out_old:
1193 f2fs_put_page(old_page, 0);
1194out:
1195 return err;
1196}
1197
1198static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1199 struct inode *new_dir, struct dentry *new_dentry,
1200 unsigned int flags)
1201{
1202 int err;
1203
1204 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1205 return -EINVAL;
1206
1207 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1208 flags);
1209 if (err)
1210 return err;
1211
1212 if (flags & RENAME_EXCHANGE) {
1213 return f2fs_cross_rename(old_dir, old_dentry,
1214 new_dir, new_dentry);
1215 }
1216 /*
1217 * VFS has already handled the new dentry existence case,
1218 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1219 */
1220 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1221}
1222
1223static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1224 struct inode *inode,
1225 struct delayed_call *done)
1226{
1227 struct page *page;
1228 const char *target;
1229
1230 if (!dentry)
1231 return ERR_PTR(-ECHILD);
1232
1233 page = read_mapping_page(inode->i_mapping, 0, NULL);
1234 if (IS_ERR(page))
1235 return ERR_CAST(page);
1236
1237 target = fscrypt_get_symlink(inode, page_address(page),
1238 inode->i_sb->s_blocksize, done);
1239 put_page(page);
1240 return target;
1241}
1242
1243const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1244 .get_link = f2fs_encrypted_get_link,
1245 .getattr = f2fs_getattr,
1246 .setattr = f2fs_setattr,
1247#ifdef CONFIG_F2FS_FS_XATTR
1248 .listxattr = f2fs_listxattr,
1249#endif
1250};
1251
1252const struct inode_operations f2fs_dir_inode_operations = {
1253 .create = f2fs_create,
1254 .lookup = f2fs_lookup,
1255 .link = f2fs_link,
1256 .unlink = f2fs_unlink,
1257 .symlink = f2fs_symlink,
1258 .mkdir = f2fs_mkdir,
1259 .rmdir = f2fs_rmdir,
1260 .mknod = f2fs_mknod,
1261 .rename = f2fs_rename2,
1262 .tmpfile = f2fs_tmpfile,
1263 .getattr = f2fs_getattr,
1264 .setattr = f2fs_setattr,
1265 .get_acl = f2fs_get_acl,
1266 .set_acl = f2fs_set_acl,
1267#ifdef CONFIG_F2FS_FS_XATTR
1268 .listxattr = f2fs_listxattr,
1269#endif
1270 .fiemap = f2fs_fiemap,
1271};
1272
1273const struct inode_operations f2fs_symlink_inode_operations = {
1274 .get_link = f2fs_get_link,
1275 .getattr = f2fs_getattr,
1276 .setattr = f2fs_setattr,
1277#ifdef CONFIG_F2FS_FS_XATTR
1278 .listxattr = f2fs_listxattr,
1279#endif
1280};
1281
1282const struct inode_operations f2fs_special_inode_operations = {
1283 .getattr = f2fs_getattr,
1284 .setattr = f2fs_setattr,
1285 .get_acl = f2fs_get_acl,
1286 .set_acl = f2fs_set_acl,
1287#ifdef CONFIG_F2FS_FS_XATTR
1288 .listxattr = f2fs_listxattr,
1289#endif
1290};