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 (!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 f2fs_set_inode_flags(inode);
128
129 trace_f2fs_new_inode(inode, 0);
130 return inode;
131
132 fail:
133 trace_f2fs_new_inode(inode, err);
134 make_bad_inode(inode);
135 if (nid_free)
136 set_inode_flag(inode, FI_FREE_NID);
137 iput(inode);
138 return ERR_PTR(err);
139 fail_drop:
140 trace_f2fs_new_inode(inode, err);
141 dquot_drop(inode);
142 inode->i_flags |= S_NOQUOTA;
143 if (nid_free)
144 set_inode_flag(inode, FI_FREE_NID);
145 clear_nlink(inode);
146 unlock_new_inode(inode);
147 iput(inode);
148 return ERR_PTR(err);
149 }
150
is_extension_exist(const unsigned char * s,const char * sub)151 static int is_extension_exist(const unsigned char *s, const char *sub)
152 {
153 size_t slen = strlen(s);
154 size_t sublen = strlen(sub);
155 int i;
156
157 /*
158 * filename format of multimedia file should be defined as:
159 * "filename + '.' + extension + (optional: '.' + temp extension)".
160 */
161 if (slen < sublen + 2)
162 return 0;
163
164 for (i = 1; i < slen - sublen; i++) {
165 if (s[i] != '.')
166 continue;
167 if (!strncasecmp(s + i + 1, sub, sublen))
168 return 1;
169 }
170
171 return 0;
172 }
173
174 /*
175 * Set multimedia files as cold files for hot/cold data separation
176 */
set_file_temperature(struct f2fs_sb_info * sbi,struct inode * inode,const unsigned char * name)177 static inline void set_file_temperature(struct f2fs_sb_info *sbi, struct inode *inode,
178 const unsigned char *name)
179 {
180 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
181 int i, cold_count, hot_count;
182
183 down_read(&sbi->sb_lock);
184
185 cold_count = le32_to_cpu(sbi->raw_super->extension_count);
186 hot_count = sbi->raw_super->hot_ext_count;
187
188 for (i = 0; i < cold_count + hot_count; i++) {
189 if (!is_extension_exist(name, extlist[i]))
190 continue;
191 if (i < cold_count)
192 file_set_cold(inode);
193 else
194 file_set_hot(inode);
195 break;
196 }
197
198 up_read(&sbi->sb_lock);
199 }
200
f2fs_update_extension_list(struct f2fs_sb_info * sbi,const char * name,bool hot,bool set)201 int f2fs_update_extension_list(struct f2fs_sb_info *sbi, const char *name,
202 bool hot, bool set)
203 {
204 __u8 (*extlist)[F2FS_EXTENSION_LEN] = sbi->raw_super->extension_list;
205 int cold_count = le32_to_cpu(sbi->raw_super->extension_count);
206 int hot_count = sbi->raw_super->hot_ext_count;
207 int total_count = cold_count + hot_count;
208 int start, count;
209 int i;
210
211 if (set) {
212 if (total_count == F2FS_MAX_EXTENSION)
213 return -EINVAL;
214 } else {
215 if (!hot && !cold_count)
216 return -EINVAL;
217 if (hot && !hot_count)
218 return -EINVAL;
219 }
220
221 if (hot) {
222 start = cold_count;
223 count = total_count;
224 } else {
225 start = 0;
226 count = cold_count;
227 }
228
229 for (i = start; i < count; i++) {
230 if (strcmp(name, extlist[i]))
231 continue;
232
233 if (set)
234 return -EINVAL;
235
236 memcpy(extlist[i], extlist[i + 1],
237 F2FS_EXTENSION_LEN * (total_count - i - 1));
238 memset(extlist[total_count - 1], 0, F2FS_EXTENSION_LEN);
239 if (hot)
240 sbi->raw_super->hot_ext_count = hot_count - 1;
241 else
242 sbi->raw_super->extension_count =
243 cpu_to_le32(cold_count - 1);
244 return 0;
245 }
246
247 if (!set)
248 return -EINVAL;
249
250 if (hot) {
251 memcpy(extlist[count], name, strlen(name));
252 sbi->raw_super->hot_ext_count = hot_count + 1;
253 } else {
254 char buf[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];
255
256 memcpy(buf, &extlist[cold_count],
257 F2FS_EXTENSION_LEN * hot_count);
258 memset(extlist[cold_count], 0, F2FS_EXTENSION_LEN);
259 memcpy(extlist[cold_count], name, strlen(name));
260 memcpy(&extlist[cold_count + 1], buf,
261 F2FS_EXTENSION_LEN * hot_count);
262 sbi->raw_super->extension_count = cpu_to_le32(cold_count + 1);
263 }
264 return 0;
265 }
266
f2fs_create(struct inode * dir,struct dentry * dentry,umode_t mode,bool excl)267 static int f2fs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
268 bool excl)
269 {
270 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
271 struct inode *inode;
272 nid_t ino = 0;
273 int err;
274
275 if (unlikely(f2fs_cp_error(sbi)))
276 return -EIO;
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;
309 out:
310 f2fs_handle_failed_inode(inode);
311 return err;
312 }
313
f2fs_link(struct dentry * old_dentry,struct inode * dir,struct dentry * dentry)314 static 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
324 err = fscrypt_prepare_link(old_dentry, dir, dentry);
325 if (err)
326 return err;
327
328 if (is_inode_flag_set(dir, FI_PROJ_INHERIT) &&
329 (!projid_eq(F2FS_I(dir)->i_projid,
330 F2FS_I(old_dentry->d_inode)->i_projid)))
331 return -EXDEV;
332
333 err = dquot_initialize(dir);
334 if (err)
335 return err;
336
337 f2fs_balance_fs(sbi, true);
338
339 inode->i_ctime = current_time(inode);
340 ihold(inode);
341
342 set_inode_flag(inode, FI_INC_LINK);
343 f2fs_lock_op(sbi);
344 err = f2fs_add_link(dentry, inode);
345 if (err)
346 goto out;
347 f2fs_unlock_op(sbi);
348
349 d_instantiate(dentry, inode);
350
351 if (IS_DIRSYNC(dir))
352 f2fs_sync_fs(sbi->sb, 1);
353 return 0;
354 out:
355 clear_inode_flag(inode, FI_INC_LINK);
356 iput(inode);
357 f2fs_unlock_op(sbi);
358 return err;
359 }
360
f2fs_get_parent(struct dentry * child)361 struct dentry *f2fs_get_parent(struct dentry *child)
362 {
363 struct qstr dotdot = QSTR_INIT("..", 2);
364 struct page *page;
365 unsigned long ino = f2fs_inode_by_name(d_inode(child), &dotdot, &page);
366 if (!ino) {
367 if (IS_ERR(page))
368 return ERR_CAST(page);
369 return ERR_PTR(-ENOENT);
370 }
371 return d_obtain_alias(f2fs_iget(child->d_sb, ino));
372 }
373
__recover_dot_dentries(struct inode * dir,nid_t pino)374 static int __recover_dot_dentries(struct inode *dir, nid_t pino)
375 {
376 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
377 struct qstr dot = QSTR_INIT(".", 1);
378 struct qstr dotdot = QSTR_INIT("..", 2);
379 struct f2fs_dir_entry *de;
380 struct page *page;
381 int err = 0;
382
383 if (f2fs_readonly(sbi->sb)) {
384 f2fs_msg(sbi->sb, KERN_INFO,
385 "skip recovering inline_dots inode (ino:%lu, pino:%u) "
386 "in readonly mountpoint", dir->i_ino, pino);
387 return 0;
388 }
389
390 err = dquot_initialize(dir);
391 if (err)
392 return err;
393
394 f2fs_balance_fs(sbi, true);
395
396 f2fs_lock_op(sbi);
397
398 de = f2fs_find_entry(dir, &dot, &page);
399 if (de) {
400 f2fs_put_page(page, 0);
401 } else if (IS_ERR(page)) {
402 err = PTR_ERR(page);
403 goto out;
404 } else {
405 err = f2fs_do_add_link(dir, &dot, NULL, dir->i_ino, S_IFDIR);
406 if (err)
407 goto out;
408 }
409
410 de = f2fs_find_entry(dir, &dotdot, &page);
411 if (de)
412 f2fs_put_page(page, 0);
413 else if (IS_ERR(page))
414 err = PTR_ERR(page);
415 else
416 err = f2fs_do_add_link(dir, &dotdot, NULL, pino, S_IFDIR);
417 out:
418 if (!err)
419 clear_inode_flag(dir, FI_INLINE_DOTS);
420
421 f2fs_unlock_op(sbi);
422 return err;
423 }
424
f2fs_lookup(struct inode * dir,struct dentry * dentry,unsigned int flags)425 static struct dentry *f2fs_lookup(struct inode *dir, struct dentry *dentry,
426 unsigned int flags)
427 {
428 struct inode *inode = NULL;
429 struct f2fs_dir_entry *de;
430 struct page *page;
431 struct dentry *new;
432 nid_t ino = -1;
433 int err = 0;
434 unsigned int root_ino = F2FS_ROOT_INO(F2FS_I_SB(dir));
435 struct fscrypt_name fname;
436
437 trace_f2fs_lookup_start(dir, dentry, flags);
438
439 if (dentry->d_name.len > F2FS_NAME_LEN) {
440 err = -ENAMETOOLONG;
441 goto out;
442 }
443
444 err = fscrypt_prepare_lookup(dir, dentry, &fname);
445 if (err == -ENOENT)
446 goto out_splice;
447 if (err)
448 goto out;
449 de = __f2fs_find_entry(dir, &fname, &page);
450 fscrypt_free_filename(&fname);
451
452 if (!de) {
453 if (IS_ERR(page)) {
454 err = PTR_ERR(page);
455 goto out;
456 }
457 goto out_splice;
458 }
459
460 ino = le32_to_cpu(de->ino);
461 f2fs_put_page(page, 0);
462
463 inode = f2fs_iget(dir->i_sb, ino);
464 if (IS_ERR(inode)) {
465 err = PTR_ERR(inode);
466 goto out;
467 }
468
469 if ((dir->i_ino == root_ino) && f2fs_has_inline_dots(dir)) {
470 err = __recover_dot_dentries(dir, root_ino);
471 if (err)
472 goto out_iput;
473 }
474
475 if (f2fs_has_inline_dots(inode)) {
476 err = __recover_dot_dentries(inode, dir->i_ino);
477 if (err)
478 goto out_iput;
479 }
480 if (f2fs_encrypted_inode(dir) &&
481 (S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode)) &&
482 !fscrypt_has_permitted_context(dir, inode)) {
483 f2fs_msg(inode->i_sb, KERN_WARNING,
484 "Inconsistent encryption contexts: %lu/%lu",
485 dir->i_ino, inode->i_ino);
486 err = -EPERM;
487 goto out_iput;
488 }
489 out_splice:
490 new = d_splice_alias(inode, dentry);
491 err = PTR_ERR_OR_ZERO(new);
492 trace_f2fs_lookup_end(dir, dentry, ino, err);
493 return new;
494 out_iput:
495 iput(inode);
496 out:
497 trace_f2fs_lookup_end(dir, dentry, ino, err);
498 return ERR_PTR(err);
499 }
500
f2fs_unlink(struct inode * dir,struct dentry * dentry)501 static int f2fs_unlink(struct inode *dir, struct dentry *dentry)
502 {
503 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
504 struct inode *inode = d_inode(dentry);
505 struct f2fs_dir_entry *de;
506 struct page *page;
507 int err = -ENOENT;
508
509 trace_f2fs_unlink_enter(dir, dentry);
510
511 if (unlikely(f2fs_cp_error(sbi)))
512 return -EIO;
513
514 err = dquot_initialize(dir);
515 if (err)
516 return err;
517 err = dquot_initialize(inode);
518 if (err)
519 return err;
520
521 de = f2fs_find_entry(dir, &dentry->d_name, &page);
522 if (!de) {
523 if (IS_ERR(page))
524 err = PTR_ERR(page);
525 goto fail;
526 }
527
528 f2fs_balance_fs(sbi, true);
529
530 f2fs_lock_op(sbi);
531 err = f2fs_acquire_orphan_inode(sbi);
532 if (err) {
533 f2fs_unlock_op(sbi);
534 f2fs_put_page(page, 0);
535 goto fail;
536 }
537 f2fs_delete_entry(de, page, dir, inode);
538 f2fs_unlock_op(sbi);
539
540 if (IS_DIRSYNC(dir))
541 f2fs_sync_fs(sbi->sb, 1);
542 fail:
543 trace_f2fs_unlink_exit(inode, err);
544 return err;
545 }
546
f2fs_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)547 static const char *f2fs_get_link(struct dentry *dentry,
548 struct inode *inode,
549 struct delayed_call *done)
550 {
551 const char *link = page_get_link(dentry, inode, done);
552 if (!IS_ERR(link) && !*link) {
553 /* this is broken symlink case */
554 do_delayed_call(done);
555 clear_delayed_call(done);
556 link = ERR_PTR(-ENOENT);
557 }
558 return link;
559 }
560
f2fs_symlink(struct inode * dir,struct dentry * dentry,const char * symname)561 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
562 const char *symname)
563 {
564 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
565 struct inode *inode;
566 size_t len = strlen(symname);
567 struct fscrypt_str disk_link;
568 int err;
569
570 if (unlikely(f2fs_cp_error(sbi)))
571 return -EIO;
572
573 err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
574 &disk_link);
575 if (err)
576 return err;
577
578 err = dquot_initialize(dir);
579 if (err)
580 return err;
581
582 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
583 if (IS_ERR(inode))
584 return PTR_ERR(inode);
585
586 if (IS_ENCRYPTED(inode))
587 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
588 else
589 inode->i_op = &f2fs_symlink_inode_operations;
590 inode_nohighmem(inode);
591 inode->i_mapping->a_ops = &f2fs_dblock_aops;
592
593 f2fs_lock_op(sbi);
594 err = f2fs_add_link(dentry, inode);
595 if (err)
596 goto out_f2fs_handle_failed_inode;
597 f2fs_unlock_op(sbi);
598 f2fs_alloc_nid_done(sbi, inode->i_ino);
599
600 err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
601 if (err)
602 goto err_out;
603
604 err = page_symlink(inode, disk_link.name, disk_link.len);
605
606 err_out:
607 d_instantiate_new(dentry, inode);
608
609 /*
610 * Let's flush symlink data in order to avoid broken symlink as much as
611 * possible. Nevertheless, fsyncing is the best way, but there is no
612 * way to get a file descriptor in order to flush that.
613 *
614 * Note that, it needs to do dir->fsync to make this recoverable.
615 * If the symlink path is stored into inline_data, there is no
616 * performance regression.
617 */
618 if (!err) {
619 filemap_write_and_wait_range(inode->i_mapping, 0,
620 disk_link.len - 1);
621
622 if (IS_DIRSYNC(dir))
623 f2fs_sync_fs(sbi->sb, 1);
624 } else {
625 f2fs_unlink(dir, dentry);
626 }
627
628 f2fs_balance_fs(sbi, true);
629 goto out_free_encrypted_link;
630
631 out_f2fs_handle_failed_inode:
632 f2fs_handle_failed_inode(inode);
633 out_free_encrypted_link:
634 if (disk_link.name != (unsigned char *)symname)
635 kfree(disk_link.name);
636 return err;
637 }
638
f2fs_mkdir(struct inode * dir,struct dentry * dentry,umode_t mode)639 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
640 {
641 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
642 struct inode *inode;
643 int err;
644
645 if (unlikely(f2fs_cp_error(sbi)))
646 return -EIO;
647
648 err = dquot_initialize(dir);
649 if (err)
650 return err;
651
652 inode = f2fs_new_inode(dir, S_IFDIR | mode);
653 if (IS_ERR(inode))
654 return PTR_ERR(inode);
655
656 inode->i_op = &f2fs_dir_inode_operations;
657 inode->i_fop = &f2fs_dir_operations;
658 inode->i_mapping->a_ops = &f2fs_dblock_aops;
659 mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
660
661 set_inode_flag(inode, FI_INC_LINK);
662 f2fs_lock_op(sbi);
663 err = f2fs_add_link(dentry, inode);
664 if (err)
665 goto out_fail;
666 f2fs_unlock_op(sbi);
667
668 f2fs_alloc_nid_done(sbi, inode->i_ino);
669
670 d_instantiate_new(dentry, inode);
671
672 if (IS_DIRSYNC(dir))
673 f2fs_sync_fs(sbi->sb, 1);
674
675 f2fs_balance_fs(sbi, true);
676 return 0;
677
678 out_fail:
679 clear_inode_flag(inode, FI_INC_LINK);
680 f2fs_handle_failed_inode(inode);
681 return err;
682 }
683
f2fs_rmdir(struct inode * dir,struct dentry * dentry)684 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
685 {
686 struct inode *inode = d_inode(dentry);
687 if (f2fs_empty_dir(inode))
688 return f2fs_unlink(dir, dentry);
689 return -ENOTEMPTY;
690 }
691
f2fs_mknod(struct inode * dir,struct dentry * dentry,umode_t mode,dev_t rdev)692 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
693 umode_t mode, dev_t rdev)
694 {
695 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
696 struct inode *inode;
697 int err = 0;
698
699 if (unlikely(f2fs_cp_error(sbi)))
700 return -EIO;
701
702 err = dquot_initialize(dir);
703 if (err)
704 return err;
705
706 inode = f2fs_new_inode(dir, mode);
707 if (IS_ERR(inode))
708 return PTR_ERR(inode);
709
710 init_special_inode(inode, inode->i_mode, rdev);
711 inode->i_op = &f2fs_special_inode_operations;
712
713 f2fs_lock_op(sbi);
714 err = f2fs_add_link(dentry, inode);
715 if (err)
716 goto out;
717 f2fs_unlock_op(sbi);
718
719 f2fs_alloc_nid_done(sbi, inode->i_ino);
720
721 d_instantiate_new(dentry, inode);
722
723 if (IS_DIRSYNC(dir))
724 f2fs_sync_fs(sbi->sb, 1);
725
726 f2fs_balance_fs(sbi, true);
727 return 0;
728 out:
729 f2fs_handle_failed_inode(inode);
730 return err;
731 }
732
__f2fs_tmpfile(struct inode * dir,struct dentry * dentry,umode_t mode,struct inode ** whiteout)733 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
734 umode_t mode, struct inode **whiteout)
735 {
736 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
737 struct inode *inode;
738 int err;
739
740 err = dquot_initialize(dir);
741 if (err)
742 return err;
743
744 inode = f2fs_new_inode(dir, mode);
745 if (IS_ERR(inode))
746 return PTR_ERR(inode);
747
748 if (whiteout) {
749 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
750 inode->i_op = &f2fs_special_inode_operations;
751 } else {
752 inode->i_op = &f2fs_file_inode_operations;
753 inode->i_fop = &f2fs_file_operations;
754 inode->i_mapping->a_ops = &f2fs_dblock_aops;
755 }
756
757 f2fs_lock_op(sbi);
758 err = f2fs_acquire_orphan_inode(sbi);
759 if (err)
760 goto out;
761
762 err = f2fs_do_tmpfile(inode, dir);
763 if (err)
764 goto release_out;
765
766 /*
767 * add this non-linked tmpfile to orphan list, in this way we could
768 * remove all unused data of tmpfile after abnormal power-off.
769 */
770 f2fs_add_orphan_inode(inode);
771 f2fs_alloc_nid_done(sbi, inode->i_ino);
772
773 if (whiteout) {
774 f2fs_i_links_write(inode, false);
775
776 spin_lock(&inode->i_lock);
777 inode->i_state |= I_LINKABLE;
778 spin_unlock(&inode->i_lock);
779
780 *whiteout = inode;
781 } else {
782 d_tmpfile(dentry, inode);
783 }
784 /* link_count was changed by d_tmpfile as well. */
785 f2fs_unlock_op(sbi);
786 unlock_new_inode(inode);
787
788 f2fs_balance_fs(sbi, true);
789 return 0;
790
791 release_out:
792 f2fs_release_orphan_inode(sbi);
793 out:
794 f2fs_handle_failed_inode(inode);
795 return err;
796 }
797
f2fs_tmpfile(struct inode * dir,struct dentry * dentry,umode_t mode)798 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
799 {
800 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
801
802 if (unlikely(f2fs_cp_error(sbi)))
803 return -EIO;
804
805 if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
806 int err = fscrypt_get_encryption_info(dir);
807 if (err)
808 return err;
809 }
810
811 return __f2fs_tmpfile(dir, dentry, mode, NULL);
812 }
813
f2fs_create_whiteout(struct inode * dir,struct inode ** whiteout)814 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
815 {
816 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
817 return -EIO;
818
819 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
820 }
821
f2fs_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)822 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
823 struct inode *new_dir, struct dentry *new_dentry,
824 unsigned int flags)
825 {
826 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
827 struct inode *old_inode = d_inode(old_dentry);
828 struct inode *new_inode = d_inode(new_dentry);
829 struct inode *whiteout = NULL;
830 struct page *old_dir_page;
831 struct page *old_page, *new_page = NULL;
832 struct f2fs_dir_entry *old_dir_entry = NULL;
833 struct f2fs_dir_entry *old_entry;
834 struct f2fs_dir_entry *new_entry;
835 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
836 int err = -ENOENT;
837
838 if (unlikely(f2fs_cp_error(sbi)))
839 return -EIO;
840
841 if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
842 (!projid_eq(F2FS_I(new_dir)->i_projid,
843 F2FS_I(old_dentry->d_inode)->i_projid)))
844 return -EXDEV;
845
846 if (flags & RENAME_WHITEOUT) {
847 err = f2fs_create_whiteout(old_dir, &whiteout);
848 if (err)
849 return err;
850 }
851
852 err = dquot_initialize(old_dir);
853 if (err)
854 goto out;
855
856 err = dquot_initialize(new_dir);
857 if (err)
858 goto out;
859
860 if (new_inode) {
861 err = dquot_initialize(new_inode);
862 if (err)
863 goto out;
864 }
865
866 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
867 if (!old_entry) {
868 if (IS_ERR(old_page))
869 err = PTR_ERR(old_page);
870 goto out;
871 }
872
873 if (S_ISDIR(old_inode->i_mode)) {
874 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
875 if (!old_dir_entry) {
876 if (IS_ERR(old_dir_page))
877 err = PTR_ERR(old_dir_page);
878 goto out_old;
879 }
880 }
881
882 if (new_inode) {
883
884 err = -ENOTEMPTY;
885 if (old_dir_entry && !f2fs_empty_dir(new_inode))
886 goto out_dir;
887
888 err = -ENOENT;
889 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
890 &new_page);
891 if (!new_entry) {
892 if (IS_ERR(new_page))
893 err = PTR_ERR(new_page);
894 goto out_dir;
895 }
896
897 f2fs_balance_fs(sbi, true);
898
899 f2fs_lock_op(sbi);
900
901 err = f2fs_acquire_orphan_inode(sbi);
902 if (err)
903 goto put_out_dir;
904
905 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
906
907 new_inode->i_ctime = current_time(new_inode);
908 down_write(&F2FS_I(new_inode)->i_sem);
909 if (old_dir_entry)
910 f2fs_i_links_write(new_inode, false);
911 f2fs_i_links_write(new_inode, false);
912 up_write(&F2FS_I(new_inode)->i_sem);
913
914 if (!new_inode->i_nlink)
915 f2fs_add_orphan_inode(new_inode);
916 else
917 f2fs_release_orphan_inode(sbi);
918 } else {
919 f2fs_balance_fs(sbi, true);
920
921 f2fs_lock_op(sbi);
922
923 err = f2fs_add_link(new_dentry, old_inode);
924 if (err) {
925 f2fs_unlock_op(sbi);
926 goto out_dir;
927 }
928
929 if (old_dir_entry)
930 f2fs_i_links_write(new_dir, true);
931
932 /*
933 * old entry and new entry can locate in the same inline
934 * dentry in inode, when attaching new entry in inline dentry,
935 * it could force inline dentry conversion, after that,
936 * old_entry and old_page will point to wrong address, in
937 * order to avoid this, let's do the check and update here.
938 */
939 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
940 f2fs_put_page(old_page, 0);
941 old_page = NULL;
942
943 old_entry = f2fs_find_entry(old_dir,
944 &old_dentry->d_name, &old_page);
945 if (!old_entry) {
946 err = -ENOENT;
947 if (IS_ERR(old_page))
948 err = PTR_ERR(old_page);
949 f2fs_unlock_op(sbi);
950 goto out_dir;
951 }
952 }
953 }
954
955 down_write(&F2FS_I(old_inode)->i_sem);
956 if (!old_dir_entry || whiteout)
957 file_lost_pino(old_inode);
958 else
959 /* adjust dir's i_pino to pass fsck check */
960 f2fs_i_pino_write(old_inode, new_dir->i_ino);
961 up_write(&F2FS_I(old_inode)->i_sem);
962
963 old_inode->i_ctime = current_time(old_inode);
964 f2fs_mark_inode_dirty_sync(old_inode, false);
965
966 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
967
968 if (whiteout) {
969 set_inode_flag(whiteout, FI_INC_LINK);
970 err = f2fs_add_link(old_dentry, whiteout);
971 if (err)
972 goto put_out_dir;
973
974 spin_lock(&whiteout->i_lock);
975 whiteout->i_state &= ~I_LINKABLE;
976 spin_unlock(&whiteout->i_lock);
977
978 iput(whiteout);
979 }
980
981 if (old_dir_entry) {
982 if (old_dir != new_dir && !whiteout)
983 f2fs_set_link(old_inode, old_dir_entry,
984 old_dir_page, new_dir);
985 else
986 f2fs_put_page(old_dir_page, 0);
987 f2fs_i_links_write(old_dir, false);
988 }
989 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
990 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
991 if (S_ISDIR(old_inode->i_mode))
992 f2fs_add_ino_entry(sbi, old_inode->i_ino,
993 TRANS_DIR_INO);
994 }
995
996 f2fs_unlock_op(sbi);
997
998 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
999 f2fs_sync_fs(sbi->sb, 1);
1000 return 0;
1001
1002 put_out_dir:
1003 f2fs_unlock_op(sbi);
1004 if (new_page)
1005 f2fs_put_page(new_page, 0);
1006 out_dir:
1007 if (old_dir_entry)
1008 f2fs_put_page(old_dir_page, 0);
1009 out_old:
1010 f2fs_put_page(old_page, 0);
1011 out:
1012 if (whiteout)
1013 iput(whiteout);
1014 return err;
1015 }
1016
f2fs_cross_rename(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry)1017 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
1018 struct inode *new_dir, struct dentry *new_dentry)
1019 {
1020 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1021 struct inode *old_inode = d_inode(old_dentry);
1022 struct inode *new_inode = d_inode(new_dentry);
1023 struct page *old_dir_page, *new_dir_page;
1024 struct page *old_page, *new_page;
1025 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1026 struct f2fs_dir_entry *old_entry, *new_entry;
1027 int old_nlink = 0, new_nlink = 0;
1028 int err = -ENOENT;
1029
1030 if (unlikely(f2fs_cp_error(sbi)))
1031 return -EIO;
1032
1033 if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1034 !projid_eq(F2FS_I(new_dir)->i_projid,
1035 F2FS_I(old_dentry->d_inode)->i_projid)) ||
1036 (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1037 !projid_eq(F2FS_I(old_dir)->i_projid,
1038 F2FS_I(new_dentry->d_inode)->i_projid)))
1039 return -EXDEV;
1040
1041 err = dquot_initialize(old_dir);
1042 if (err)
1043 goto out;
1044
1045 err = dquot_initialize(new_dir);
1046 if (err)
1047 goto out;
1048
1049 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1050 if (!old_entry) {
1051 if (IS_ERR(old_page))
1052 err = PTR_ERR(old_page);
1053 goto out;
1054 }
1055
1056 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1057 if (!new_entry) {
1058 if (IS_ERR(new_page))
1059 err = PTR_ERR(new_page);
1060 goto out_old;
1061 }
1062
1063 /* prepare for updating ".." directory entry info later */
1064 if (old_dir != new_dir) {
1065 if (S_ISDIR(old_inode->i_mode)) {
1066 old_dir_entry = f2fs_parent_dir(old_inode,
1067 &old_dir_page);
1068 if (!old_dir_entry) {
1069 if (IS_ERR(old_dir_page))
1070 err = PTR_ERR(old_dir_page);
1071 goto out_new;
1072 }
1073 }
1074
1075 if (S_ISDIR(new_inode->i_mode)) {
1076 new_dir_entry = f2fs_parent_dir(new_inode,
1077 &new_dir_page);
1078 if (!new_dir_entry) {
1079 if (IS_ERR(new_dir_page))
1080 err = PTR_ERR(new_dir_page);
1081 goto out_old_dir;
1082 }
1083 }
1084 }
1085
1086 /*
1087 * If cross rename between file and directory those are not
1088 * in the same directory, we will inc nlink of file's parent
1089 * later, so we should check upper boundary of its nlink.
1090 */
1091 if ((!old_dir_entry || !new_dir_entry) &&
1092 old_dir_entry != new_dir_entry) {
1093 old_nlink = old_dir_entry ? -1 : 1;
1094 new_nlink = -old_nlink;
1095 err = -EMLINK;
1096 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1097 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1098 goto out_new_dir;
1099 }
1100
1101 f2fs_balance_fs(sbi, true);
1102
1103 f2fs_lock_op(sbi);
1104
1105 /* update ".." directory entry info of old dentry */
1106 if (old_dir_entry)
1107 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1108
1109 /* update ".." directory entry info of new dentry */
1110 if (new_dir_entry)
1111 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1112
1113 /* update directory entry info of old dir inode */
1114 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1115
1116 down_write(&F2FS_I(old_inode)->i_sem);
1117 if (!old_dir_entry)
1118 file_lost_pino(old_inode);
1119 else
1120 /* adjust dir's i_pino to pass fsck check */
1121 f2fs_i_pino_write(old_inode, new_dir->i_ino);
1122 up_write(&F2FS_I(old_inode)->i_sem);
1123
1124 old_dir->i_ctime = current_time(old_dir);
1125 if (old_nlink) {
1126 down_write(&F2FS_I(old_dir)->i_sem);
1127 f2fs_i_links_write(old_dir, old_nlink > 0);
1128 up_write(&F2FS_I(old_dir)->i_sem);
1129 }
1130 f2fs_mark_inode_dirty_sync(old_dir, false);
1131
1132 /* update directory entry info of new dir inode */
1133 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1134
1135 down_write(&F2FS_I(new_inode)->i_sem);
1136 if (!new_dir_entry)
1137 file_lost_pino(new_inode);
1138 else
1139 /* adjust dir's i_pino to pass fsck check */
1140 f2fs_i_pino_write(new_inode, old_dir->i_ino);
1141 up_write(&F2FS_I(new_inode)->i_sem);
1142
1143 new_dir->i_ctime = current_time(new_dir);
1144 if (new_nlink) {
1145 down_write(&F2FS_I(new_dir)->i_sem);
1146 f2fs_i_links_write(new_dir, new_nlink > 0);
1147 up_write(&F2FS_I(new_dir)->i_sem);
1148 }
1149 f2fs_mark_inode_dirty_sync(new_dir, false);
1150
1151 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1152 f2fs_add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1153 f2fs_add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1154 }
1155
1156 f2fs_unlock_op(sbi);
1157
1158 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1159 f2fs_sync_fs(sbi->sb, 1);
1160 return 0;
1161 out_new_dir:
1162 if (new_dir_entry) {
1163 f2fs_put_page(new_dir_page, 0);
1164 }
1165 out_old_dir:
1166 if (old_dir_entry) {
1167 f2fs_put_page(old_dir_page, 0);
1168 }
1169 out_new:
1170 f2fs_put_page(new_page, 0);
1171 out_old:
1172 f2fs_put_page(old_page, 0);
1173 out:
1174 return err;
1175 }
1176
f2fs_rename2(struct inode * old_dir,struct dentry * old_dentry,struct inode * new_dir,struct dentry * new_dentry,unsigned int flags)1177 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1178 struct inode *new_dir, struct dentry *new_dentry,
1179 unsigned int flags)
1180 {
1181 int err;
1182
1183 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1184 return -EINVAL;
1185
1186 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1187 flags);
1188 if (err)
1189 return err;
1190
1191 if (flags & RENAME_EXCHANGE) {
1192 return f2fs_cross_rename(old_dir, old_dentry,
1193 new_dir, new_dentry);
1194 }
1195 /*
1196 * VFS has already handled the new dentry existence case,
1197 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1198 */
1199 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1200 }
1201
f2fs_encrypted_get_link(struct dentry * dentry,struct inode * inode,struct delayed_call * done)1202 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1203 struct inode *inode,
1204 struct delayed_call *done)
1205 {
1206 struct page *page;
1207 const char *target;
1208
1209 if (!dentry)
1210 return ERR_PTR(-ECHILD);
1211
1212 page = read_mapping_page(inode->i_mapping, 0, NULL);
1213 if (IS_ERR(page))
1214 return ERR_CAST(page);
1215
1216 target = fscrypt_get_symlink(inode, page_address(page),
1217 inode->i_sb->s_blocksize, done);
1218 put_page(page);
1219 return target;
1220 }
1221
f2fs_encrypted_symlink_getattr(const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)1222 static int f2fs_encrypted_symlink_getattr(const struct path *path,
1223 struct kstat *stat, u32 request_mask,
1224 unsigned int query_flags)
1225 {
1226 f2fs_getattr(path, stat, request_mask, query_flags);
1227
1228 return fscrypt_symlink_getattr(path, stat);
1229 }
1230
1231 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1232 .get_link = f2fs_encrypted_get_link,
1233 .getattr = f2fs_encrypted_symlink_getattr,
1234 .setattr = f2fs_setattr,
1235 #ifdef CONFIG_F2FS_FS_XATTR
1236 .listxattr = f2fs_listxattr,
1237 #endif
1238 };
1239
1240 const struct inode_operations f2fs_dir_inode_operations = {
1241 .create = f2fs_create,
1242 .lookup = f2fs_lookup,
1243 .link = f2fs_link,
1244 .unlink = f2fs_unlink,
1245 .symlink = f2fs_symlink,
1246 .mkdir = f2fs_mkdir,
1247 .rmdir = f2fs_rmdir,
1248 .mknod = f2fs_mknod,
1249 .rename = f2fs_rename2,
1250 .tmpfile = f2fs_tmpfile,
1251 .getattr = f2fs_getattr,
1252 .setattr = f2fs_setattr,
1253 .get_acl = f2fs_get_acl,
1254 .set_acl = f2fs_set_acl,
1255 #ifdef CONFIG_F2FS_FS_XATTR
1256 .listxattr = f2fs_listxattr,
1257 #endif
1258 };
1259
1260 const struct inode_operations f2fs_symlink_inode_operations = {
1261 .get_link = f2fs_get_link,
1262 .getattr = f2fs_getattr,
1263 .setattr = f2fs_setattr,
1264 #ifdef CONFIG_F2FS_FS_XATTR
1265 .listxattr = f2fs_listxattr,
1266 #endif
1267 };
1268
1269 const struct inode_operations f2fs_special_inode_operations = {
1270 .getattr = f2fs_getattr,
1271 .setattr = f2fs_setattr,
1272 .get_acl = f2fs_get_acl,
1273 .set_acl = f2fs_set_acl,
1274 #ifdef CONFIG_F2FS_FS_XATTR
1275 .listxattr = f2fs_listxattr,
1276 #endif
1277 };
1278