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
f2fs_new_inode(struct inode * dir,umode_t mode)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 =
54 F2FS_I(inode)->i_crtime = current_time(inode);
55 inode->i_generation = sbi->s_next_generation++;
56
57 err = insert_inode_locked(inode);
58 if (err) {
59 err = -EINVAL;
60 goto fail;
61 }
62
63 if (f2fs_sb_has_project_quota(sbi->sb) &&
64 (F2FS_I(dir)->i_flags & FS_PROJINHERIT_FL))
65 F2FS_I(inode)->i_projid = F2FS_I(dir)->i_projid;
66 else
67 F2FS_I(inode)->i_projid = make_kprojid(&init_user_ns,
68 F2FS_DEF_PROJID);
69
70 err = dquot_initialize(inode);
71 if (err)
72 goto fail_drop;
73
74 err = dquot_alloc_inode(inode);
75 if (err)
76 goto fail_drop;
77
78 set_inode_flag(inode, FI_NEW_INODE);
79
80 /* If the directory encrypted, then we should encrypt the inode. */
81 if ((f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) &&
82 f2fs_may_encrypt(inode))
83 f2fs_set_encrypted_inode(inode);
84
85 if (f2fs_sb_has_extra_attr(sbi->sb)) {
86 set_inode_flag(inode, FI_EXTRA_ATTR);
87 F2FS_I(inode)->i_extra_isize = F2FS_TOTAL_EXTRA_ATTR_SIZE;
88 }
89
90 if (test_opt(sbi, INLINE_XATTR))
91 set_inode_flag(inode, FI_INLINE_XATTR);
92
93 if (test_opt(sbi, INLINE_DATA) && f2fs_may_inline_data(inode))
94 set_inode_flag(inode, FI_INLINE_DATA);
95 if (f2fs_may_inline_dentry(inode))
96 set_inode_flag(inode, FI_INLINE_DENTRY);
97
98 if (f2fs_sb_has_flexible_inline_xattr(sbi->sb)) {
99 f2fs_bug_on(sbi, !f2fs_has_extra_attr(inode));
100 if (f2fs_has_inline_xattr(inode))
101 xattr_size = F2FS_OPTION(sbi).inline_xattr_size;
102 /* Otherwise, will be 0 */
103 } else if (f2fs_has_inline_xattr(inode) ||
104 f2fs_has_inline_dentry(inode)) {
105 xattr_size = DEFAULT_INLINE_XATTR_ADDRS;
106 }
107 F2FS_I(inode)->i_inline_xattr_size = xattr_size;
108
109 f2fs_init_extent_tree(inode, NULL);
110
111 stat_inc_inline_xattr(inode);
112 stat_inc_inline_inode(inode);
113 stat_inc_inline_dir(inode);
114
115 F2FS_I(inode)->i_flags =
116 f2fs_mask_flags(mode, F2FS_I(dir)->i_flags & F2FS_FL_INHERITED);
117
118 if (S_ISDIR(inode->i_mode))
119 F2FS_I(inode)->i_flags |= FS_INDEX_FL;
120
121 if (F2FS_I(inode)->i_flags & FS_PROJINHERIT_FL)
122 set_inode_flag(inode, FI_PROJ_INHERIT);
123
124 trace_f2fs_new_inode(inode, 0);
125 return inode;
126
127 fail:
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);
134 fail_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
is_extension_exist(const unsigned char * s,const char * sub)146 static 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 */
set_file_temperature(struct f2fs_sb_info * sbi,struct inode * inode,const unsigned char * name)172 static 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 continue;
186 if (i < cold_count)
187 file_set_cold(inode);
188 else
189 file_set_hot(inode);
190 break;
191 }
192
193 up_read(&sbi->sb_lock);
194 }
195
update_extension_list(struct f2fs_sb_info * sbi,const char * name,bool hot,bool set)196 int update_extension_list(struct f2fs_sb_info *sbi, const char *name,
197 bool hot, bool set)
198 {
199 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
200 int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
201 int hot_count = sbi->raw_super->hot_ext_count;
202 int total_count = cold_count + hot_count;
203 int start, count;
204 int i;
205
206 if (set) {
207 if (total_count == F2FS_MAX_EXTENSION)
208 return -EINVAL;
209 } else {
210 if (!hot && !cold_count)
211 return -EINVAL;
212 if (hot && !hot_count)
213 return -EINVAL;
214 }
215
216 if (hot) {
217 start = cold_count;
218 count = total_count;
219 } else {
220 start = 0;
221 count = cold_count;
222 }
223
224 for (i = start; i < count; i++) {
225 if (strcmp(name, extlist[i]))
226 continue;
227
228 if (set)
229 return -EINVAL;
230
231 memcpy(extlist[i], extlist[i + 1],
232 F2FS_EXTENSION_LEN * (total_count - i - 1));
233 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
234 if (hot)
235 sbi->raw_super->hot_ext_count = hot_count - 1;
236 else
237 sbi->raw_super->extension_count =
238 cpu_to_le32(cold_count - 1);
239 return 0;
240 }
241
242 if (!set)
243 return -EINVAL;
244
245 if (hot) {
246 strncpy(extlist[count], name, strlen(name));
247 sbi->raw_super->hot_ext_count = hot_count + 1;
248 } else {
249 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
250
251 memcpy(buf, &extlist[cold_count],
252 F2FS_EXTENSION_LEN * hot_count);
253 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
254 strncpy(extlist[cold_count], name, strlen(name));
255 memcpy(&extlist[cold_count + 1], buf,
256 F2FS_EXTENSION_LEN * hot_count);
257 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
258 }
259 return 0;
260 }
261
f2fs_create(struct inode * dir,struct dentry * dentry,umode_t mode,bool excl)262 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
263 bool excl)
264 {
265 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
266 struct inode *inode;
267 nid_t ino = 0;
268 int err;
269
270 if (unlikely(f2fs_cp_error(sbi)))
271 return -EIO;
272
273 err = dquot_initialize(dir);
274 if (err)
275 return err;
276
277 inode = f2fs_new_inode(dir, mode);
278 if (IS_ERR(inode))
279 return PTR_ERR(inode);
280
281 if (!test_opt(sbi, DISABLE_EXT_IDENTIFY))
282 set_file_temperature(sbi, inode, dentry->d_name.name);
283
284 inode->i_op = &f2fs_file_inode_operations;
285 inode->i_fop = &f2fs_file_operations;
286 inode->i_mapping->a_ops = &f2fs_dblock_aops;
287 ino = inode->i_ino;
288
289 f2fs_lock_op(sbi);
290 err = f2fs_add_link(dentry, inode);
291 if (err)
292 goto out;
293 f2fs_unlock_op(sbi);
294
295 alloc_nid_done(sbi, ino);
296
297 d_instantiate_new(dentry, inode);
298
299 if (IS_DIRSYNC(dir))
300 f2fs_sync_fs(sbi->sb, 1);
301
302 f2fs_balance_fs(sbi, true);
303 return 0;
304 out:
305 handle_failed_inode(inode);
306 return err;
307 }
308
f2fs_link(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)309 static int f2fs_link(struct dentry *old_dentry, struct inode *dir,
310 struct dentry *dentry)
311 {
312 struct inode *inode = d_inode(old_dentry);
313 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
314 int err;
315
316 if (unlikely(f2fs_cp_error(sbi)))
317 return -EIO;
318
319 err = fscrypt_prepare_link(old_dentry, dir, dentry);
320 if (err)
321 return err;
322
323 if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
324 (!projid_eq(F2FS_I(dir)->i_projid,
325 F2FS_I(old_dentry->d_inode)->i_projid)))
326 return -EXDEV;
327
328 err = dquot_initialize(dir);
329 if (err)
330 return err;
331
332 f2fs_balance_fs(sbi, true);
333
334 inode->i_ctime = current_time(inode);
335 ihold(inode);
336
337 set_inode_flag(inode, FI_INC_LINK);
338 f2fs_lock_op(sbi);
339 err = f2fs_add_link(dentry, inode);
340 if (err)
341 goto out;
342 f2fs_unlock_op(sbi);
343
344 d_instantiate(dentry, inode);
345
346 if (IS_DIRSYNC(dir))
347 f2fs_sync_fs(sbi->sb, 1);
348 return 0;
349 out:
350 clear_inode_flag(inode, FI_INC_LINK);
351 iput(inode);
352 f2fs_unlock_op(sbi);
353 return err;
354 }
355
f2fs_get_parent(struct dentry * child)356 struct dentry *f2fs_get_parent(struct dentry *child)
357 {
358 struct qstr dotdot = QSTR_INIT("..", 2);
359 struct page *page;
360 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
361 if (!ino) {
362 if (IS_ERR(page))
363 return ERR_CAST(page);
364 return ERR_PTR(-ENOENT);
365 }
366 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
367 }
368
__recover_dot_dentries(struct inode * dir,nid_t pino)369 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
370 {
371 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
372 struct qstr dot = QSTR_INIT(".", 1);
373 struct qstr dotdot = QSTR_INIT("..", 2);
374 struct f2fs_dir_entry *de;
375 struct page *page;
376 int err = 0;
377
378 if (f2fs_readonly(sbi->sb)) {
379 f2fs_msg(sbi->sb, KERN_INFO,
380 "skip recovering inline_dots inode (ino:%lu, pino:%u) "
381 "in readonly mountpoint", dir->i_ino, pino);
382 return 0;
383 }
384
385 err = dquot_initialize(dir);
386 if (err)
387 return err;
388
389 f2fs_balance_fs(sbi, true);
390
391 f2fs_lock_op(sbi);
392
393 de = f2fs_find_entry(dir, &dot, &page);
394 if (de) {
395 f2fs_put_page(page, 0);
396 } else if (IS_ERR(page)) {
397 err = PTR_ERR(page);
398 goto out;
399 } else {
400 err = __f2fs_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
401 if (err)
402 goto out;
403 }
404
405 de = f2fs_find_entry(dir, &dotdot, &page);
406 if (de)
407 f2fs_put_page(page, 0);
408 else if (IS_ERR(page))
409 err = PTR_ERR(page);
410 else
411 err = __f2fs_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
412 out:
413 if (!err)
414 clear_inode_flag(dir, FI_INLINE_DOTS);
415
416 f2fs_unlock_op(sbi);
417 return err;
418 }
419
f2fs_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)420 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
421 unsigned int flags)
422 {
423 struct inode *inode = NULL;
424 struct f2fs_dir_entry *de;
425 struct page *page;
426 struct dentry *new;
427 nid_t ino = -1;
428 int err = 0;
429 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
430
431 trace_f2fs_lookup_start(dir, dentry, flags);
432
433 err = fscrypt_prepare_lookup(dir, dentry, flags);
434 if (err)
435 goto out;
436
437 if (dentry->d_name.len > F2FS_NAME_LEN) {
438 err = -ENAMETOOLONG;
439 goto out;
440 }
441
442 de = f2fs_find_entry(dir, &dentry->d_name, &page);
443 if (!de) {
444 if (IS_ERR(page)) {
445 err = PTR_ERR(page);
446 goto out;
447 }
448 goto out_splice;
449 }
450
451 ino = le32_to_cpu(de->ino);
452 f2fs_put_page(page, 0);
453
454 inode = f2fs_iget(dir->i_sb, ino);
455 if (IS_ERR(inode)) {
456 err = PTR_ERR(inode);
457 goto out;
458 }
459
460 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
461 err = __recover_dot_dentries(dir, root_ino);
462 if (err)
463 goto out_iput;
464 }
465
466 if (f2fs_has_inline_dots(inode)) {
467 err = __recover_dot_dentries(inode, dir->i_ino);
468 if (err)
469 goto out_iput;
470 }
471 if (f2fs_encrypted_inode(dir) &&
472 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
473 !fscrypt_has_permitted_context(dir, inode)) {
474 f2fs_msg(inode->i_sb, KERN_WARNING,
475 "Inconsistent encryption contexts: %lu/%lu",
476 dir->i_ino, inode->i_ino);
477 err = -EPERM;
478 goto out_iput;
479 }
480 out_splice:
481 new = d_splice_alias(inode, dentry);
482 if (IS_ERR(new))
483 err = PTR_ERR(new);
484 trace_f2fs_lookup_end(dir, dentry, ino, err);
485 return new;
486 out_iput:
487 iput(inode);
488 out:
489 trace_f2fs_lookup_end(dir, dentry, ino, err);
490 return ERR_PTR(err);
491 }
492
f2fs_unlink(struct inode * dir,struct dentry * dentry)493 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
494 {
495 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
496 struct inode *inode = d_inode(dentry);
497 struct f2fs_dir_entry *de;
498 struct page *page;
499 int err = -ENOENT;
500
501 trace_f2fs_unlink_enter(dir, dentry);
502
503 if (unlikely(f2fs_cp_error(sbi)))
504 return -EIO;
505
506 err = dquot_initialize(dir);
507 if (err)
508 return err;
509 err = dquot_initialize(inode);
510 if (err)
511 return err;
512
513 de = f2fs_find_entry(dir, &dentry->d_name, &page);
514 if (!de) {
515 if (IS_ERR(page))
516 err = PTR_ERR(page);
517 goto fail;
518 }
519
520 f2fs_balance_fs(sbi, true);
521
522 f2fs_lock_op(sbi);
523 err = acquire_orphan_inode(sbi);
524 if (err) {
525 f2fs_unlock_op(sbi);
526 f2fs_put_page(page, 0);
527 goto fail;
528 }
529 f2fs_delete_entry(de, page, dir, inode);
530 f2fs_unlock_op(sbi);
531
532 if (IS_DIRSYNC(dir))
533 f2fs_sync_fs(sbi->sb, 1);
534 fail:
535 trace_f2fs_unlink_exit(inode, err);
536 return err;
537 }
538
f2fs_follow_link(struct dentry * dentry,void ** cookie)539 static const char *f2fs_follow_link(struct dentry *dentry, void **cookie)
540 {
541 const char *link = page_follow_link_light(dentry, cookie);
542 if (!IS_ERR(link) && !*link) {
543 /* this is broken symlink case */
544 page_put_link(NULL, *cookie);
545 link = ERR_PTR(-ENOENT);
546 }
547 return link;
548 }
549
f2fs_symlink(struct inode * dir,struct dentry * dentry,const char * symname)550 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
551 const char *symname)
552 {
553 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
554 struct inode *inode;
555 size_t len = strlen(symname);
556 struct fscrypt_str disk_link;
557 int err;
558
559 if (unlikely(f2fs_cp_error(sbi)))
560 return -EIO;
561
562 err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
563 &disk_link);
564 if (err)
565 return err;
566
567 err = dquot_initialize(dir);
568 if (err)
569 return err;
570
571 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
572 if (IS_ERR(inode))
573 return PTR_ERR(inode);
574
575 if (IS_ENCRYPTED(inode))
576 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
577 else
578 inode->i_op = &f2fs_symlink_inode_operations;
579 inode_nohighmem(inode);
580 inode->i_mapping->a_ops = &f2fs_dblock_aops;
581
582 f2fs_lock_op(sbi);
583 err = f2fs_add_link(dentry, inode);
584 if (err)
585 goto out_handle_failed_inode;
586 f2fs_unlock_op(sbi);
587 alloc_nid_done(sbi, inode->i_ino);
588
589 err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
590 if (err)
591 goto err_out;
592
593 err = page_symlink(inode, disk_link.name, disk_link.len);
594
595 err_out:
596 d_instantiate_new(dentry, inode);
597
598 /*
599 * Let's flush symlink data in order to avoid broken symlink as much as
600 * possible. Nevertheless, fsyncing is the best way, but there is no
601 * way to get a file descriptor in order to flush that.
602 *
603 * Note that, it needs to do dir->fsync to make this recoverable.
604 * If the symlink path is stored into inline_data, there is no
605 * performance regression.
606 */
607 if (!err) {
608 filemap_write_and_wait_range(inode->i_mapping, 0,
609 disk_link.len - 1);
610
611 if (IS_DIRSYNC(dir))
612 f2fs_sync_fs(sbi->sb, 1);
613 } else {
614 f2fs_unlink(dir, dentry);
615 }
616
617 f2fs_balance_fs(sbi, true);
618 goto out_free_encrypted_link;
619
620 out_handle_failed_inode:
621 handle_failed_inode(inode);
622 out_free_encrypted_link:
623 if (disk_link.name != (unsigned char *)symname)
624 kfree(disk_link.name);
625 return err;
626 }
627
f2fs_mkdir(struct inode * dir,struct dentry * dentry,umode_t mode)628 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
629 {
630 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
631 struct inode *inode;
632 int err;
633
634 if (unlikely(f2fs_cp_error(sbi)))
635 return -EIO;
636
637 err = dquot_initialize(dir);
638 if (err)
639 return err;
640
641 inode = f2fs_new_inode(dir, S_IFDIR | mode);
642 if (IS_ERR(inode))
643 return PTR_ERR(inode);
644
645 inode->i_op = &f2fs_dir_inode_operations;
646 inode->i_fop = &f2fs_dir_operations;
647 inode->i_mapping->a_ops = &f2fs_dblock_aops;
648 inode_nohighmem(inode);
649
650 set_inode_flag(inode, FI_INC_LINK);
651 f2fs_lock_op(sbi);
652 err = f2fs_add_link(dentry, inode);
653 if (err)
654 goto out_fail;
655 f2fs_unlock_op(sbi);
656
657 alloc_nid_done(sbi, inode->i_ino);
658
659 d_instantiate_new(dentry, inode);
660
661 if (IS_DIRSYNC(dir))
662 f2fs_sync_fs(sbi->sb, 1);
663
664 f2fs_balance_fs(sbi, true);
665 return 0;
666
667 out_fail:
668 clear_inode_flag(inode, FI_INC_LINK);
669 handle_failed_inode(inode);
670 return err;
671 }
672
f2fs_rmdir(struct inode * dir,struct dentry * dentry)673 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
674 {
675 struct inode *inode = d_inode(dentry);
676 if (f2fs_empty_dir(inode))
677 return f2fs_unlink(dir, dentry);
678 return -ENOTEMPTY;
679 }
680
f2fs_mknod(struct inode * dir,struct dentry * dentry,umode_t mode,dev_t rdev)681 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
682 umode_t mode, dev_t rdev)
683 {
684 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
685 struct inode *inode;
686 int err = 0;
687
688 if (unlikely(f2fs_cp_error(sbi)))
689 return -EIO;
690
691 err = dquot_initialize(dir);
692 if (err)
693 return err;
694
695 inode = f2fs_new_inode(dir, mode);
696 if (IS_ERR(inode))
697 return PTR_ERR(inode);
698
699 init_special_inode(inode, inode->i_mode, rdev);
700 inode->i_op = &f2fs_special_inode_operations;
701
702 f2fs_lock_op(sbi);
703 err = f2fs_add_link(dentry, inode);
704 if (err)
705 goto out;
706 f2fs_unlock_op(sbi);
707
708 alloc_nid_done(sbi, inode->i_ino);
709
710 d_instantiate_new(dentry, inode);
711
712 if (IS_DIRSYNC(dir))
713 f2fs_sync_fs(sbi->sb, 1);
714
715 f2fs_balance_fs(sbi, true);
716 return 0;
717 out:
718 handle_failed_inode(inode);
719 return err;
720 }
721
__f2fs_tmpfile(struct inode * dir,struct dentry * dentry,umode_t mode,struct inode ** whiteout)722 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
723 umode_t mode, struct inode **whiteout)
724 {
725 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
726 struct inode *inode;
727 int err;
728
729 err = dquot_initialize(dir);
730 if (err)
731 return err;
732
733 inode = f2fs_new_inode(dir, mode);
734 if (IS_ERR(inode))
735 return PTR_ERR(inode);
736
737 if (whiteout) {
738 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
739 inode->i_op = &f2fs_special_inode_operations;
740 } else {
741 inode->i_op = &f2fs_file_inode_operations;
742 inode->i_fop = &f2fs_file_operations;
743 inode->i_mapping->a_ops = &f2fs_dblock_aops;
744 }
745
746 f2fs_lock_op(sbi);
747 err = acquire_orphan_inode(sbi);
748 if (err)
749 goto out;
750
751 err = f2fs_do_tmpfile(inode, dir);
752 if (err)
753 goto release_out;
754
755 /*
756 * add this non-linked tmpfile to orphan list, in this way we could
757 * remove all unused data of tmpfile after abnormal power-off.
758 */
759 add_orphan_inode(inode);
760 alloc_nid_done(sbi, inode->i_ino);
761
762 if (whiteout) {
763 f2fs_i_links_write(inode, false);
764 *whiteout = inode;
765 } else {
766 d_tmpfile(dentry, inode);
767 }
768 /* link_count was changed by d_tmpfile as well. */
769 f2fs_unlock_op(sbi);
770 unlock_new_inode(inode);
771
772 f2fs_balance_fs(sbi, true);
773 return 0;
774
775 release_out:
776 release_orphan_inode(sbi);
777 out:
778 handle_failed_inode(inode);
779 return err;
780 }
781
f2fs_tmpfile(struct inode * dir,struct dentry * dentry,umode_t mode)782 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
783 {
784 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
785
786 if (unlikely(f2fs_cp_error(sbi)))
787 return -EIO;
788
789 if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
790 int err = fscrypt_get_encryption_info(dir);
791 if (err)
792 return err;
793 }
794
795 return __f2fs_tmpfile(dir, dentry, mode, NULL);
796 }
797
f2fs_create_whiteout(struct inode * dir,struct inode ** whiteout)798 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
799 {
800 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
801 return -EIO;
802
803 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
804 }
805
f2fs_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)806 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
807 struct inode *new_dir, struct dentry *new_dentry,
808 unsigned int flags)
809 {
810 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
811 struct inode *old_inode = d_inode(old_dentry);
812 struct inode *new_inode = d_inode(new_dentry);
813 struct inode *whiteout = NULL;
814 struct page *old_dir_page;
815 struct page *old_page, *new_page = NULL;
816 struct f2fs_dir_entry *old_dir_entry = NULL;
817 struct f2fs_dir_entry *old_entry;
818 struct f2fs_dir_entry *new_entry;
819 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
820 int err = -ENOENT;
821
822 if (unlikely(f2fs_cp_error(sbi)))
823 return -EIO;
824
825 if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
826 (!projid_eq(F2FS_I(new_dir)->i_projid,
827 F2FS_I(old_dentry->d_inode)->i_projid)))
828 return -EXDEV;
829
830 err = dquot_initialize(old_dir);
831 if (err)
832 goto out;
833
834 err = dquot_initialize(new_dir);
835 if (err)
836 goto out;
837
838 if (new_inode) {
839 err = dquot_initialize(new_inode);
840 if (err)
841 goto out;
842 }
843
844 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
845 if (!old_entry) {
846 if (IS_ERR(old_page))
847 err = PTR_ERR(old_page);
848 goto out;
849 }
850
851 if (S_ISDIR(old_inode->i_mode)) {
852 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
853 if (!old_dir_entry) {
854 if (IS_ERR(old_dir_page))
855 err = PTR_ERR(old_dir_page);
856 goto out_old;
857 }
858 }
859
860 if (flags & RENAME_WHITEOUT) {
861 err = f2fs_create_whiteout(old_dir, &whiteout);
862 if (err)
863 goto out_dir;
864 }
865
866 if (new_inode) {
867
868 err = -ENOTEMPTY;
869 if (old_dir_entry && !f2fs_empty_dir(new_inode))
870 goto out_whiteout;
871
872 err = -ENOENT;
873 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
874 &new_page);
875 if (!new_entry) {
876 if (IS_ERR(new_page))
877 err = PTR_ERR(new_page);
878 goto out_whiteout;
879 }
880
881 f2fs_balance_fs(sbi, true);
882
883 f2fs_lock_op(sbi);
884
885 err = acquire_orphan_inode(sbi);
886 if (err)
887 goto put_out_dir;
888
889 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
890
891 new_inode->i_ctime = current_time(new_inode);
892 down_write(&F2FS_I(new_inode)->i_sem);
893 if (old_dir_entry)
894 f2fs_i_links_write(new_inode, false);
895 f2fs_i_links_write(new_inode, false);
896 up_write(&F2FS_I(new_inode)->i_sem);
897
898 if (!new_inode->i_nlink)
899 add_orphan_inode(new_inode);
900 else
901 release_orphan_inode(sbi);
902 } else {
903 f2fs_balance_fs(sbi, true);
904
905 f2fs_lock_op(sbi);
906
907 err = f2fs_add_link(new_dentry, old_inode);
908 if (err) {
909 f2fs_unlock_op(sbi);
910 goto out_whiteout;
911 }
912
913 if (old_dir_entry)
914 f2fs_i_links_write(new_dir, true);
915
916 /*
917 * old entry and new entry can locate in the same inline
918 * dentry in inode, when attaching new entry in inline dentry,
919 * it could force inline dentry conversion, after that,
920 * old_entry and old_page will point to wrong address, in
921 * order to avoid this, let's do the check and update here.
922 */
923 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
924 f2fs_put_page(old_page, 0);
925 old_page = NULL;
926
927 old_entry = f2fs_find_entry(old_dir,
928 &old_dentry->d_name, &old_page);
929 if (!old_entry) {
930 err = -ENOENT;
931 if (IS_ERR(old_page))
932 err = PTR_ERR(old_page);
933 f2fs_unlock_op(sbi);
934 goto out_whiteout;
935 }
936 }
937 }
938
939 down_write(&F2FS_I(old_inode)->i_sem);
940 if (!old_dir_entry || whiteout)
941 file_lost_pino(old_inode);
942 else
943 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
944 up_write(&F2FS_I(old_inode)->i_sem);
945
946 old_inode->i_ctime = current_time(old_inode);
947 f2fs_mark_inode_dirty_sync(old_inode, false);
948
949 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
950
951 if (whiteout) {
952 whiteout->i_state |= I_LINKABLE;
953 set_inode_flag(whiteout, FI_INC_LINK);
954 err = f2fs_add_link(old_dentry, whiteout);
955 if (err)
956 goto put_out_dir;
957 whiteout->i_state &= ~I_LINKABLE;
958 iput(whiteout);
959 }
960
961 if (old_dir_entry) {
962 if (old_dir != new_dir && !whiteout)
963 f2fs_set_link(old_inode, old_dir_entry,
964 old_dir_page, new_dir);
965 else
966 f2fs_put_page(old_dir_page, 0);
967 f2fs_i_links_write(old_dir, false);
968 }
969 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
970 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
971
972 f2fs_unlock_op(sbi);
973
974 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
975 f2fs_sync_fs(sbi->sb, 1);
976 return 0;
977
978 put_out_dir:
979 f2fs_unlock_op(sbi);
980 if (new_page)
981 f2fs_put_page(new_page, 0);
982 out_whiteout:
983 if (whiteout)
984 iput(whiteout);
985 out_dir:
986 if (old_dir_entry)
987 f2fs_put_page(old_dir_page, 0);
988 out_old:
989 f2fs_put_page(old_page, 0);
990 out:
991 return err;
992 }
993
f2fs_cross_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry)994 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
995 struct inode *new_dir, struct dentry *new_dentry)
996 {
997 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
998 struct inode *old_inode = d_inode(old_dentry);
999 struct inode *new_inode = d_inode(new_dentry);
1000 struct page *old_dir_page, *new_dir_page;
1001 struct page *old_page, *new_page;
1002 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1003 struct f2fs_dir_entry *old_entry, *new_entry;
1004 int old_nlink = 0, new_nlink = 0;
1005 int err = -ENOENT;
1006
1007 if (unlikely(f2fs_cp_error(sbi)))
1008 return -EIO;
1009
1010 if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1011 !projid_eq(F2FS_I(new_dir)->i_projid,
1012 F2FS_I(old_dentry->d_inode)->i_projid)) ||
1013 (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1014 !projid_eq(F2FS_I(old_dir)->i_projid,
1015 F2FS_I(new_dentry->d_inode)->i_projid)))
1016 return -EXDEV;
1017
1018 err = dquot_initialize(old_dir);
1019 if (err)
1020 goto out;
1021
1022 err = dquot_initialize(new_dir);
1023 if (err)
1024 goto out;
1025
1026 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1027 if (!old_entry) {
1028 if (IS_ERR(old_page))
1029 err = PTR_ERR(old_page);
1030 goto out;
1031 }
1032
1033 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1034 if (!new_entry) {
1035 if (IS_ERR(new_page))
1036 err = PTR_ERR(new_page);
1037 goto out_old;
1038 }
1039
1040 /* prepare for updating ".." directory entry info later */
1041 if (old_dir != new_dir) {
1042 if (S_ISDIR(old_inode->i_mode)) {
1043 old_dir_entry = f2fs_parent_dir(old_inode,
1044 &old_dir_page);
1045 if (!old_dir_entry) {
1046 if (IS_ERR(old_dir_page))
1047 err = PTR_ERR(old_dir_page);
1048 goto out_new;
1049 }
1050 }
1051
1052 if (S_ISDIR(new_inode->i_mode)) {
1053 new_dir_entry = f2fs_parent_dir(new_inode,
1054 &new_dir_page);
1055 if (!new_dir_entry) {
1056 if (IS_ERR(new_dir_page))
1057 err = PTR_ERR(new_dir_page);
1058 goto out_old_dir;
1059 }
1060 }
1061 }
1062
1063 /*
1064 * If cross rename between file and directory those are not
1065 * in the same directory, we will inc nlink of file's parent
1066 * later, so we should check upper boundary of its nlink.
1067 */
1068 if ((!old_dir_entry || !new_dir_entry) &&
1069 old_dir_entry != new_dir_entry) {
1070 old_nlink = old_dir_entry ? -1 : 1;
1071 new_nlink = -old_nlink;
1072 err = -EMLINK;
1073 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1074 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1075 goto out_new_dir;
1076 }
1077
1078 f2fs_balance_fs(sbi, true);
1079
1080 f2fs_lock_op(sbi);
1081
1082 /* update ".." directory entry info of old dentry */
1083 if (old_dir_entry)
1084 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1085
1086 /* update ".." directory entry info of new dentry */
1087 if (new_dir_entry)
1088 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1089
1090 /* update directory entry info of old dir inode */
1091 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1092
1093 down_write(&F2FS_I(old_inode)->i_sem);
1094 file_lost_pino(old_inode);
1095 up_write(&F2FS_I(old_inode)->i_sem);
1096
1097 old_dir->i_ctime = current_time(old_dir);
1098 if (old_nlink) {
1099 down_write(&F2FS_I(old_dir)->i_sem);
1100 f2fs_i_links_write(old_dir, old_nlink > 0);
1101 up_write(&F2FS_I(old_dir)->i_sem);
1102 }
1103 f2fs_mark_inode_dirty_sync(old_dir, false);
1104
1105 /* update directory entry info of new dir inode */
1106 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1107
1108 down_write(&F2FS_I(new_inode)->i_sem);
1109 file_lost_pino(new_inode);
1110 up_write(&F2FS_I(new_inode)->i_sem);
1111
1112 new_dir->i_ctime = current_time(new_dir);
1113 if (new_nlink) {
1114 down_write(&F2FS_I(new_dir)->i_sem);
1115 f2fs_i_links_write(new_dir, new_nlink > 0);
1116 up_write(&F2FS_I(new_dir)->i_sem);
1117 }
1118 f2fs_mark_inode_dirty_sync(new_dir, false);
1119
1120 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1121 add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1122 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1123 }
1124
1125 f2fs_unlock_op(sbi);
1126
1127 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1128 f2fs_sync_fs(sbi->sb, 1);
1129 return 0;
1130 out_new_dir:
1131 if (new_dir_entry) {
1132 f2fs_put_page(new_dir_page, 0);
1133 }
1134 out_old_dir:
1135 if (old_dir_entry) {
1136 f2fs_put_page(old_dir_page, 0);
1137 }
1138 out_new:
1139 f2fs_put_page(new_page, 0);
1140 out_old:
1141 f2fs_put_page(old_page, 0);
1142 out:
1143 return err;
1144 }
1145
f2fs_rename2(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)1146 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1147 struct inode *new_dir, struct dentry *new_dentry,
1148 unsigned int flags)
1149 {
1150 int err;
1151
1152 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1153 return -EINVAL;
1154
1155 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1156 flags);
1157 if (err)
1158 return err;
1159
1160 if (flags & RENAME_EXCHANGE) {
1161 return f2fs_cross_rename(old_dir, old_dentry,
1162 new_dir, new_dentry);
1163 }
1164 /*
1165 * VFS has already handled the new dentry existence case,
1166 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1167 */
1168 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1169 }
1170
f2fs_encrypted_follow_link(struct dentry * dentry,void ** cookie)1171 static const char *f2fs_encrypted_follow_link(struct dentry *dentry, void **cookie)
1172 {
1173 struct inode *inode = d_inode(dentry);
1174 struct page *page;
1175 void *target;
1176
1177 if (!dentry)
1178 return ERR_PTR(-ECHILD);
1179
1180 page = read_mapping_page(inode->i_mapping, 0, NULL);
1181 if (IS_ERR(page))
1182 return ERR_CAST(page);
1183
1184 target = fscrypt_get_symlink(inode, page_address(page),
1185 inode->i_sb->s_blocksize);
1186 put_page(page);
1187 return *cookie = target;
1188 }
1189
1190 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1191 .readlink = generic_readlink,
1192 .follow_link = f2fs_encrypted_follow_link,
1193 .put_link = kfree_put_link,
1194 .getattr = f2fs_getattr,
1195 .setattr = f2fs_setattr,
1196 #ifdef CONFIG_F2FS_FS_XATTR
1197 .setxattr = generic_setxattr,
1198 .getxattr = generic_getxattr,
1199 .listxattr = f2fs_listxattr,
1200 .removexattr = generic_removexattr,
1201 #endif
1202 };
1203
1204 const struct inode_operations f2fs_dir_inode_operations = {
1205 .create = f2fs_create,
1206 .lookup = f2fs_lookup,
1207 .link = f2fs_link,
1208 .unlink = f2fs_unlink,
1209 .symlink = f2fs_symlink,
1210 .mkdir = f2fs_mkdir,
1211 .rmdir = f2fs_rmdir,
1212 .mknod = f2fs_mknod,
1213 .rename2 = f2fs_rename2,
1214 .tmpfile = f2fs_tmpfile,
1215 .getattr = f2fs_getattr,
1216 .setattr = f2fs_setattr,
1217 .get_acl = f2fs_get_acl,
1218 .set_acl = f2fs_set_acl,
1219 #ifdef CONFIG_F2FS_FS_XATTR
1220 .setxattr = generic_setxattr,
1221 .getxattr = generic_getxattr,
1222 .listxattr = f2fs_listxattr,
1223 .removexattr = generic_removexattr,
1224 #endif
1225 };
1226
1227 const struct inode_operations f2fs_symlink_inode_operations = {
1228 .readlink = generic_readlink,
1229 .follow_link = f2fs_follow_link,
1230 .put_link = page_put_link,
1231 .getattr = f2fs_getattr,
1232 .setattr = f2fs_setattr,
1233 #ifdef CONFIG_F2FS_FS_XATTR
1234 .setxattr = generic_setxattr,
1235 .getxattr = generic_getxattr,
1236 .listxattr = f2fs_listxattr,
1237 .removexattr = generic_removexattr,
1238 #endif
1239 };
1240
1241 const struct inode_operations f2fs_special_inode_operations = {
1242 .getattr = f2fs_getattr,
1243 .setattr = f2fs_setattr,
1244 .get_acl = f2fs_get_acl,
1245 .set_acl = f2fs_set_acl,
1246 #ifdef CONFIG_F2FS_FS_XATTR
1247 .setxattr = generic_setxattr,
1248 .getxattr = generic_getxattr,
1249 .listxattr = f2fs_listxattr,
1250 .removexattr = generic_removexattr,
1251 #endif
1252 };
1253