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[RAMEN9610-21029]staGing: android: ashmem: Disallow ashmem memory from being remapped
[GitHub/MotorolaMobilityLLC/kernel-slsi.git] / fs / f2fs / namei.c
1 /*
2 * fs/f2fs/namei.c
3 *
4 * Copyright (c) 2012 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11 #include <linux/fs.h>
12 #include <linux/f2fs_fs.h>
13 #include <linux/pagemap.h>
14 #include <linux/sched.h>
15 #include <linux/ctype.h>
16 #include <linux/dcache.h>
17 #include <linux/namei.h>
18 #include <linux/quotaops.h>
19
20 #include "f2fs.h"
21 #include "node.h"
22 #include "xattr.h"
23 #include "acl.h"
24 #include <trace/events/f2fs.h>
25
26 static struct inode *f2fs_new_inode(struct inode *dir, umode_t mode)
27 {
28 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
29 nid_t ino;
30 struct inode *inode;
31 bool nid_free = false;
32 int xattr_size = 0;
33 int err;
34
35 inode = new_inode(dir->i_sb);
36 if (!inode)
37 return ERR_PTR(-ENOMEM);
38
39 f2fs_lock_op(sbi);
40 if (!alloc_nid(sbi, &ino)) {
41 f2fs_unlock_op(sbi);
42 err = -ENOSPC;
43 goto fail;
44 }
45 f2fs_unlock_op(sbi);
46
47 nid_free = true;
48
49 inode_init_owner(inode, dir, mode);
50
51 inode->i_ino = ino;
52 inode->i_blocks = 0;
53 inode->i_mtime = inode->i_atime = inode->i_ctime =
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
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 */
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
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
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
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
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
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
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
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
539 static const char *f2fs_get_link(struct dentry *dentry,
540 struct inode *inode,
541 struct delayed_call *done)
542 {
543 const char *link = page_get_link(dentry, inode, done);
544 if (!IS_ERR(link) && !*link) {
545 /* this is broken symlink case */
546 do_delayed_call(done);
547 clear_delayed_call(done);
548 link = ERR_PTR(-ENOENT);
549 }
550 return link;
551 }
552
553 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
554 const char *symname)
555 {
556 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
557 struct inode *inode;
558 size_t len = strlen(symname);
559 struct fscrypt_str disk_link;
560 int err;
561
562 if (unlikely(f2fs_cp_error(sbi)))
563 return -EIO;
564
565 err = fscrypt_prepare_symlink(dir, symname, len, dir->i_sb->s_blocksize,
566 &disk_link);
567 if (err)
568 return err;
569
570 err = dquot_initialize(dir);
571 if (err)
572 return err;
573
574 inode = f2fs_new_inode(dir, S_IFLNK | S_IRWXUGO);
575 if (IS_ERR(inode))
576 return PTR_ERR(inode);
577
578 if (IS_ENCRYPTED(inode))
579 inode->i_op = &f2fs_encrypted_symlink_inode_operations;
580 else
581 inode->i_op = &f2fs_symlink_inode_operations;
582 inode_nohighmem(inode);
583 inode->i_mapping->a_ops = &f2fs_dblock_aops;
584
585 f2fs_lock_op(sbi);
586 err = f2fs_add_link(dentry, inode);
587 if (err)
588 goto out_handle_failed_inode;
589 f2fs_unlock_op(sbi);
590 alloc_nid_done(sbi, inode->i_ino);
591
592 err = fscrypt_encrypt_symlink(inode, symname, len, &disk_link);
593 if (err)
594 goto err_out;
595
596 err = page_symlink(inode, disk_link.name, disk_link.len);
597
598 err_out:
599 d_instantiate_new(dentry, inode);
600
601 /*
602 * Let's flush symlink data in order to avoid broken symlink as much as
603 * possible. Nevertheless, fsyncing is the best way, but there is no
604 * way to get a file descriptor in order to flush that.
605 *
606 * Note that, it needs to do dir->fsync to make this recoverable.
607 * If the symlink path is stored into inline_data, there is no
608 * performance regression.
609 */
610 if (!err) {
611 filemap_write_and_wait_range(inode->i_mapping, 0,
612 disk_link.len - 1);
613
614 if (IS_DIRSYNC(dir))
615 f2fs_sync_fs(sbi->sb, 1);
616 } else {
617 f2fs_unlink(dir, dentry);
618 }
619
620 f2fs_balance_fs(sbi, true);
621 goto out_free_encrypted_link;
622
623 out_handle_failed_inode:
624 handle_failed_inode(inode);
625 out_free_encrypted_link:
626 if (disk_link.name != (unsigned char *)symname)
627 kfree(disk_link.name);
628 return err;
629 }
630
631 static int f2fs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
632 {
633 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
634 struct inode *inode;
635 int err;
636
637 if (unlikely(f2fs_cp_error(sbi)))
638 return -EIO;
639
640 err = dquot_initialize(dir);
641 if (err)
642 return err;
643
644 inode = f2fs_new_inode(dir, S_IFDIR | mode);
645 if (IS_ERR(inode))
646 return PTR_ERR(inode);
647
648 inode->i_op = &f2fs_dir_inode_operations;
649 inode->i_fop = &f2fs_dir_operations;
650 inode->i_mapping->a_ops = &f2fs_dblock_aops;
651 inode_nohighmem(inode);
652
653 set_inode_flag(inode, FI_INC_LINK);
654 f2fs_lock_op(sbi);
655 err = f2fs_add_link(dentry, inode);
656 if (err)
657 goto out_fail;
658 f2fs_unlock_op(sbi);
659
660 alloc_nid_done(sbi, inode->i_ino);
661
662 d_instantiate_new(dentry, inode);
663
664 if (IS_DIRSYNC(dir))
665 f2fs_sync_fs(sbi->sb, 1);
666
667 f2fs_balance_fs(sbi, true);
668 return 0;
669
670 out_fail:
671 clear_inode_flag(inode, FI_INC_LINK);
672 handle_failed_inode(inode);
673 return err;
674 }
675
676 static int f2fs_rmdir(struct inode *dir, struct dentry *dentry)
677 {
678 struct inode *inode = d_inode(dentry);
679 if (f2fs_empty_dir(inode))
680 return f2fs_unlink(dir, dentry);
681 return -ENOTEMPTY;
682 }
683
684 static int f2fs_mknod(struct inode *dir, struct dentry *dentry,
685 umode_t mode, dev_t rdev)
686 {
687 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
688 struct inode *inode;
689 int err = 0;
690
691 if (unlikely(f2fs_cp_error(sbi)))
692 return -EIO;
693
694 err = dquot_initialize(dir);
695 if (err)
696 return err;
697
698 inode = f2fs_new_inode(dir, mode);
699 if (IS_ERR(inode))
700 return PTR_ERR(inode);
701
702 init_special_inode(inode, inode->i_mode, rdev);
703 inode->i_op = &f2fs_special_inode_operations;
704
705 f2fs_lock_op(sbi);
706 err = f2fs_add_link(dentry, inode);
707 if (err)
708 goto out;
709 f2fs_unlock_op(sbi);
710
711 alloc_nid_done(sbi, inode->i_ino);
712
713 d_instantiate_new(dentry, inode);
714
715 if (IS_DIRSYNC(dir))
716 f2fs_sync_fs(sbi->sb, 1);
717
718 f2fs_balance_fs(sbi, true);
719 return 0;
720 out:
721 handle_failed_inode(inode);
722 return err;
723 }
724
725 static int __f2fs_tmpfile(struct inode *dir, struct dentry *dentry,
726 umode_t mode, struct inode **whiteout)
727 {
728 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
729 struct inode *inode;
730 int err;
731
732 err = dquot_initialize(dir);
733 if (err)
734 return err;
735
736 inode = f2fs_new_inode(dir, mode);
737 if (IS_ERR(inode))
738 return PTR_ERR(inode);
739
740 if (whiteout) {
741 init_special_inode(inode, inode->i_mode, WHITEOUT_DEV);
742 inode->i_op = &f2fs_special_inode_operations;
743 } else {
744 inode->i_op = &f2fs_file_inode_operations;
745 inode->i_fop = &f2fs_file_operations;
746 inode->i_mapping->a_ops = &f2fs_dblock_aops;
747 }
748
749 f2fs_lock_op(sbi);
750 err = acquire_orphan_inode(sbi);
751 if (err)
752 goto out;
753
754 err = f2fs_do_tmpfile(inode, dir);
755 if (err)
756 goto release_out;
757
758 /*
759 * add this non-linked tmpfile to orphan list, in this way we could
760 * remove all unused data of tmpfile after abnormal power-off.
761 */
762 add_orphan_inode(inode);
763 alloc_nid_done(sbi, inode->i_ino);
764
765 if (whiteout) {
766 f2fs_i_links_write(inode, false);
767 *whiteout = inode;
768 } else {
769 d_tmpfile(dentry, inode);
770 }
771 /* link_count was changed by d_tmpfile as well. */
772 f2fs_unlock_op(sbi);
773 unlock_new_inode(inode);
774
775 f2fs_balance_fs(sbi, true);
776 return 0;
777
778 release_out:
779 release_orphan_inode(sbi);
780 out:
781 handle_failed_inode(inode);
782 return err;
783 }
784
785 static int f2fs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode)
786 {
787 struct f2fs_sb_info *sbi = F2FS_I_SB(dir);
788
789 if (unlikely(f2fs_cp_error(sbi)))
790 return -EIO;
791
792 if (f2fs_encrypted_inode(dir) || DUMMY_ENCRYPTION_ENABLED(sbi)) {
793 int err = fscrypt_get_encryption_info(dir);
794 if (err)
795 return err;
796 }
797
798 return __f2fs_tmpfile(dir, dentry, mode, NULL);
799 }
800
801 static int f2fs_create_whiteout(struct inode *dir, struct inode **whiteout)
802 {
803 if (unlikely(f2fs_cp_error(F2FS_I_SB(dir))))
804 return -EIO;
805
806 return __f2fs_tmpfile(dir, NULL, S_IFCHR | WHITEOUT_MODE, whiteout);
807 }
808
809 static int f2fs_rename(struct inode *old_dir, struct dentry *old_dentry,
810 struct inode *new_dir, struct dentry *new_dentry,
811 unsigned int flags)
812 {
813 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
814 struct inode *old_inode = d_inode(old_dentry);
815 struct inode *new_inode = d_inode(new_dentry);
816 struct inode *whiteout = NULL;
817 struct page *old_dir_page;
818 struct page *old_page, *new_page = NULL;
819 struct f2fs_dir_entry *old_dir_entry = NULL;
820 struct f2fs_dir_entry *old_entry;
821 struct f2fs_dir_entry *new_entry;
822 bool is_old_inline = f2fs_has_inline_dentry(old_dir);
823 int err = -ENOENT;
824
825 if (unlikely(f2fs_cp_error(sbi)))
826 return -EIO;
827
828 if (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
829 (!projid_eq(F2FS_I(new_dir)->i_projid,
830 F2FS_I(old_dentry->d_inode)->i_projid)))
831 return -EXDEV;
832
833 err = dquot_initialize(old_dir);
834 if (err)
835 goto out;
836
837 err = dquot_initialize(new_dir);
838 if (err)
839 goto out;
840
841 if (new_inode) {
842 err = dquot_initialize(new_inode);
843 if (err)
844 goto out;
845 }
846
847 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
848 if (!old_entry) {
849 if (IS_ERR(old_page))
850 err = PTR_ERR(old_page);
851 goto out;
852 }
853
854 if (S_ISDIR(old_inode->i_mode)) {
855 old_dir_entry = f2fs_parent_dir(old_inode, &old_dir_page);
856 if (!old_dir_entry) {
857 if (IS_ERR(old_dir_page))
858 err = PTR_ERR(old_dir_page);
859 goto out_old;
860 }
861 }
862
863 if (flags & RENAME_WHITEOUT) {
864 err = f2fs_create_whiteout(old_dir, &whiteout);
865 if (err)
866 goto out_dir;
867 }
868
869 if (new_inode) {
870
871 err = -ENOTEMPTY;
872 if (old_dir_entry && !f2fs_empty_dir(new_inode))
873 goto out_whiteout;
874
875 err = -ENOENT;
876 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name,
877 &new_page);
878 if (!new_entry) {
879 if (IS_ERR(new_page))
880 err = PTR_ERR(new_page);
881 goto out_whiteout;
882 }
883
884 f2fs_balance_fs(sbi, true);
885
886 f2fs_lock_op(sbi);
887
888 err = acquire_orphan_inode(sbi);
889 if (err)
890 goto put_out_dir;
891
892 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
893
894 new_inode->i_ctime = current_time(new_inode);
895 down_write(&F2FS_I(new_inode)->i_sem);
896 if (old_dir_entry)
897 f2fs_i_links_write(new_inode, false);
898 f2fs_i_links_write(new_inode, false);
899 up_write(&F2FS_I(new_inode)->i_sem);
900
901 if (!new_inode->i_nlink)
902 add_orphan_inode(new_inode);
903 else
904 release_orphan_inode(sbi);
905 } else {
906 f2fs_balance_fs(sbi, true);
907
908 f2fs_lock_op(sbi);
909
910 err = f2fs_add_link(new_dentry, old_inode);
911 if (err) {
912 f2fs_unlock_op(sbi);
913 goto out_whiteout;
914 }
915
916 if (old_dir_entry)
917 f2fs_i_links_write(new_dir, true);
918
919 /*
920 * old entry and new entry can locate in the same inline
921 * dentry in inode, when attaching new entry in inline dentry,
922 * it could force inline dentry conversion, after that,
923 * old_entry and old_page will point to wrong address, in
924 * order to avoid this, let's do the check and update here.
925 */
926 if (is_old_inline && !f2fs_has_inline_dentry(old_dir)) {
927 f2fs_put_page(old_page, 0);
928 old_page = NULL;
929
930 old_entry = f2fs_find_entry(old_dir,
931 &old_dentry->d_name, &old_page);
932 if (!old_entry) {
933 err = -ENOENT;
934 if (IS_ERR(old_page))
935 err = PTR_ERR(old_page);
936 f2fs_unlock_op(sbi);
937 goto out_whiteout;
938 }
939 }
940 }
941
942 down_write(&F2FS_I(old_inode)->i_sem);
943 if (!old_dir_entry || whiteout)
944 file_lost_pino(old_inode);
945 else
946 F2FS_I(old_inode)->i_pino = new_dir->i_ino;
947 up_write(&F2FS_I(old_inode)->i_sem);
948
949 old_inode->i_ctime = current_time(old_inode);
950 f2fs_mark_inode_dirty_sync(old_inode, false);
951
952 f2fs_delete_entry(old_entry, old_page, old_dir, NULL);
953
954 if (whiteout) {
955 whiteout->i_state |= I_LINKABLE;
956 set_inode_flag(whiteout, FI_INC_LINK);
957 err = f2fs_add_link(old_dentry, whiteout);
958 if (err)
959 goto put_out_dir;
960 whiteout->i_state &= ~I_LINKABLE;
961 iput(whiteout);
962 }
963
964 if (old_dir_entry) {
965 if (old_dir != new_dir && !whiteout)
966 f2fs_set_link(old_inode, old_dir_entry,
967 old_dir_page, new_dir);
968 else
969 f2fs_put_page(old_dir_page, 0);
970 f2fs_i_links_write(old_dir, false);
971 }
972 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT)
973 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
974
975 f2fs_unlock_op(sbi);
976
977 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
978 f2fs_sync_fs(sbi->sb, 1);
979 return 0;
980
981 put_out_dir:
982 f2fs_unlock_op(sbi);
983 if (new_page)
984 f2fs_put_page(new_page, 0);
985 out_whiteout:
986 if (whiteout)
987 iput(whiteout);
988 out_dir:
989 if (old_dir_entry)
990 f2fs_put_page(old_dir_page, 0);
991 out_old:
992 f2fs_put_page(old_page, 0);
993 out:
994 return err;
995 }
996
997 static int f2fs_cross_rename(struct inode *old_dir, struct dentry *old_dentry,
998 struct inode *new_dir, struct dentry *new_dentry)
999 {
1000 struct f2fs_sb_info *sbi = F2FS_I_SB(old_dir);
1001 struct inode *old_inode = d_inode(old_dentry);
1002 struct inode *new_inode = d_inode(new_dentry);
1003 struct page *old_dir_page, *new_dir_page;
1004 struct page *old_page, *new_page;
1005 struct f2fs_dir_entry *old_dir_entry = NULL, *new_dir_entry = NULL;
1006 struct f2fs_dir_entry *old_entry, *new_entry;
1007 int old_nlink = 0, new_nlink = 0;
1008 int err = -ENOENT;
1009
1010 if (unlikely(f2fs_cp_error(sbi)))
1011 return -EIO;
1012
1013 if ((is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1014 !projid_eq(F2FS_I(new_dir)->i_projid,
1015 F2FS_I(old_dentry->d_inode)->i_projid)) ||
1016 (is_inode_flag_set(new_dir, FI_PROJ_INHERIT) &&
1017 !projid_eq(F2FS_I(old_dir)->i_projid,
1018 F2FS_I(new_dentry->d_inode)->i_projid)))
1019 return -EXDEV;
1020
1021 err = dquot_initialize(old_dir);
1022 if (err)
1023 goto out;
1024
1025 err = dquot_initialize(new_dir);
1026 if (err)
1027 goto out;
1028
1029 old_entry = f2fs_find_entry(old_dir, &old_dentry->d_name, &old_page);
1030 if (!old_entry) {
1031 if (IS_ERR(old_page))
1032 err = PTR_ERR(old_page);
1033 goto out;
1034 }
1035
1036 new_entry = f2fs_find_entry(new_dir, &new_dentry->d_name, &new_page);
1037 if (!new_entry) {
1038 if (IS_ERR(new_page))
1039 err = PTR_ERR(new_page);
1040 goto out_old;
1041 }
1042
1043 /* prepare for updating ".." directory entry info later */
1044 if (old_dir != new_dir) {
1045 if (S_ISDIR(old_inode->i_mode)) {
1046 old_dir_entry = f2fs_parent_dir(old_inode,
1047 &old_dir_page);
1048 if (!old_dir_entry) {
1049 if (IS_ERR(old_dir_page))
1050 err = PTR_ERR(old_dir_page);
1051 goto out_new;
1052 }
1053 }
1054
1055 if (S_ISDIR(new_inode->i_mode)) {
1056 new_dir_entry = f2fs_parent_dir(new_inode,
1057 &new_dir_page);
1058 if (!new_dir_entry) {
1059 if (IS_ERR(new_dir_page))
1060 err = PTR_ERR(new_dir_page);
1061 goto out_old_dir;
1062 }
1063 }
1064 }
1065
1066 /*
1067 * If cross rename between file and directory those are not
1068 * in the same directory, we will inc nlink of file's parent
1069 * later, so we should check upper boundary of its nlink.
1070 */
1071 if ((!old_dir_entry || !new_dir_entry) &&
1072 old_dir_entry != new_dir_entry) {
1073 old_nlink = old_dir_entry ? -1 : 1;
1074 new_nlink = -old_nlink;
1075 err = -EMLINK;
1076 if ((old_nlink > 0 && old_dir->i_nlink >= F2FS_LINK_MAX) ||
1077 (new_nlink > 0 && new_dir->i_nlink >= F2FS_LINK_MAX))
1078 goto out_new_dir;
1079 }
1080
1081 f2fs_balance_fs(sbi, true);
1082
1083 f2fs_lock_op(sbi);
1084
1085 /* update ".." directory entry info of old dentry */
1086 if (old_dir_entry)
1087 f2fs_set_link(old_inode, old_dir_entry, old_dir_page, new_dir);
1088
1089 /* update ".." directory entry info of new dentry */
1090 if (new_dir_entry)
1091 f2fs_set_link(new_inode, new_dir_entry, new_dir_page, old_dir);
1092
1093 /* update directory entry info of old dir inode */
1094 f2fs_set_link(old_dir, old_entry, old_page, new_inode);
1095
1096 down_write(&F2FS_I(old_inode)->i_sem);
1097 file_lost_pino(old_inode);
1098 up_write(&F2FS_I(old_inode)->i_sem);
1099
1100 old_dir->i_ctime = current_time(old_dir);
1101 if (old_nlink) {
1102 down_write(&F2FS_I(old_dir)->i_sem);
1103 f2fs_i_links_write(old_dir, old_nlink > 0);
1104 up_write(&F2FS_I(old_dir)->i_sem);
1105 }
1106 f2fs_mark_inode_dirty_sync(old_dir, false);
1107
1108 /* update directory entry info of new dir inode */
1109 f2fs_set_link(new_dir, new_entry, new_page, old_inode);
1110
1111 down_write(&F2FS_I(new_inode)->i_sem);
1112 file_lost_pino(new_inode);
1113 up_write(&F2FS_I(new_inode)->i_sem);
1114
1115 new_dir->i_ctime = current_time(new_dir);
1116 if (new_nlink) {
1117 down_write(&F2FS_I(new_dir)->i_sem);
1118 f2fs_i_links_write(new_dir, new_nlink > 0);
1119 up_write(&F2FS_I(new_dir)->i_sem);
1120 }
1121 f2fs_mark_inode_dirty_sync(new_dir, false);
1122
1123 if (F2FS_OPTION(sbi).fsync_mode == FSYNC_MODE_STRICT) {
1124 add_ino_entry(sbi, old_dir->i_ino, TRANS_DIR_INO);
1125 add_ino_entry(sbi, new_dir->i_ino, TRANS_DIR_INO);
1126 }
1127
1128 f2fs_unlock_op(sbi);
1129
1130 if (IS_DIRSYNC(old_dir) || IS_DIRSYNC(new_dir))
1131 f2fs_sync_fs(sbi->sb, 1);
1132 return 0;
1133 out_new_dir:
1134 if (new_dir_entry) {
1135 f2fs_put_page(new_dir_page, 0);
1136 }
1137 out_old_dir:
1138 if (old_dir_entry) {
1139 f2fs_put_page(old_dir_page, 0);
1140 }
1141 out_new:
1142 f2fs_put_page(new_page, 0);
1143 out_old:
1144 f2fs_put_page(old_page, 0);
1145 out:
1146 return err;
1147 }
1148
1149 static int f2fs_rename2(struct inode *old_dir, struct dentry *old_dentry,
1150 struct inode *new_dir, struct dentry *new_dentry,
1151 unsigned int flags)
1152 {
1153 int err;
1154
1155 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1156 return -EINVAL;
1157
1158 err = fscrypt_prepare_rename(old_dir, old_dentry, new_dir, new_dentry,
1159 flags);
1160 if (err)
1161 return err;
1162
1163 if (flags & RENAME_EXCHANGE) {
1164 return f2fs_cross_rename(old_dir, old_dentry,
1165 new_dir, new_dentry);
1166 }
1167 /*
1168 * VFS has already handled the new dentry existence case,
1169 * here, we just deal with "RENAME_NOREPLACE" as regular rename.
1170 */
1171 return f2fs_rename(old_dir, old_dentry, new_dir, new_dentry, flags);
1172 }
1173
1174 static const char *f2fs_encrypted_get_link(struct dentry *dentry,
1175 struct inode *inode,
1176 struct delayed_call *done)
1177 {
1178 struct page *page;
1179 const char *target;
1180
1181 if (!dentry)
1182 return ERR_PTR(-ECHILD);
1183
1184 page = read_mapping_page(inode->i_mapping, 0, NULL);
1185 if (IS_ERR(page))
1186 return ERR_CAST(page);
1187
1188 target = fscrypt_get_symlink(inode, page_address(page),
1189 inode->i_sb->s_blocksize, done);
1190 put_page(page);
1191 return target;
1192 }
1193
1194 const struct inode_operations f2fs_encrypted_symlink_inode_operations = {
1195 .get_link = f2fs_encrypted_get_link,
1196 .getattr = f2fs_getattr,
1197 .setattr = f2fs_setattr,
1198 #ifdef CONFIG_F2FS_FS_XATTR
1199 .listxattr = f2fs_listxattr,
1200 #endif
1201 };
1202
1203 const struct inode_operations f2fs_dir_inode_operations = {
1204 .create = f2fs_create,
1205 .lookup = f2fs_lookup,
1206 .link = f2fs_link,
1207 .unlink = f2fs_unlink,
1208 .symlink = f2fs_symlink,
1209 .mkdir = f2fs_mkdir,
1210 .rmdir = f2fs_rmdir,
1211 .mknod = f2fs_mknod,
1212 .rename = f2fs_rename2,
1213 .tmpfile = f2fs_tmpfile,
1214 .getattr = f2fs_getattr,
1215 .setattr = f2fs_setattr,
1216 .get_acl = f2fs_get_acl,
1217 .set_acl = f2fs_set_acl,
1218 #ifdef CONFIG_F2FS_FS_XATTR
1219 .listxattr = f2fs_listxattr,
1220 #endif
1221 };
1222
1223 const struct inode_operations f2fs_symlink_inode_operations = {
1224 .get_link = f2fs_get_link,
1225 .getattr = f2fs_getattr,
1226 .setattr = f2fs_setattr,
1227 #ifdef CONFIG_F2FS_FS_XATTR
1228 .listxattr = f2fs_listxattr,
1229 #endif
1230 };
1231
1232 const struct inode_operations f2fs_special_inode_operations = {
1233 .getattr = f2fs_getattr,
1234 .setattr = f2fs_setattr,
1235 .get_acl = f2fs_get_acl,
1236 .set_acl = f2fs_set_acl,
1237 #ifdef CONFIG_F2FS_FS_XATTR
1238 .listxattr = f2fs_listxattr,
1239 #endif
1240 };
Motorola kernel-slsi