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1 | /* |
2 | * Copyright (C) 2005-2017 Junjiro R. Okajima | |
3 | * | |
4 | * This program, aufs is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | /* | |
19 | * whiteout for logical deletion and opaque directory | |
20 | */ | |
21 | ||
22 | #ifndef __AUFS_WHOUT_H__ | |
23 | #define __AUFS_WHOUT_H__ | |
24 | ||
25 | #ifdef __KERNEL__ | |
26 | ||
27 | #include "dir.h" | |
28 | ||
29 | /* whout.c */ | |
30 | int au_wh_name_alloc(struct qstr *wh, const struct qstr *name); | |
31 | int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, int try_sio); | |
32 | int au_diropq_test(struct dentry *h_dentry); | |
33 | struct au_branch; | |
34 | struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br, | |
35 | struct qstr *prefix); | |
36 | int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br); | |
37 | int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path, | |
38 | struct dentry *dentry); | |
39 | int au_wh_init(struct au_branch *br, struct super_block *sb); | |
40 | ||
41 | /* diropq flags */ | |
42 | #define AuDiropq_CREATE 1 | |
43 | #define au_ftest_diropq(flags, name) ((flags) & AuDiropq_##name) | |
44 | #define au_fset_diropq(flags, name) \ | |
45 | do { (flags) |= AuDiropq_##name; } while (0) | |
46 | #define au_fclr_diropq(flags, name) \ | |
47 | do { (flags) &= ~AuDiropq_##name; } while (0) | |
48 | ||
49 | struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex, | |
50 | unsigned int flags); | |
51 | struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name, | |
52 | struct au_branch *br); | |
53 | struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex, | |
54 | struct dentry *h_parent); | |
55 | ||
56 | /* real rmdir for the whiteout-ed dir */ | |
57 | struct au_whtmp_rmdir { | |
58 | struct inode *dir; | |
59 | struct au_branch *br; | |
60 | struct dentry *wh_dentry; | |
61 | struct au_nhash whlist; | |
62 | }; | |
63 | ||
64 | struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp); | |
65 | void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp); | |
66 | int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
67 | struct dentry *wh_dentry, struct au_nhash *whlist); | |
68 | void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
69 | struct dentry *wh_dentry, struct au_whtmp_rmdir *args); | |
70 | ||
71 | /* ---------------------------------------------------------------------- */ | |
72 | ||
73 | static inline struct dentry *au_diropq_create(struct dentry *dentry, | |
74 | aufs_bindex_t bindex) | |
75 | { | |
76 | return au_diropq_sio(dentry, bindex, AuDiropq_CREATE); | |
77 | } | |
78 | ||
79 | static inline int au_diropq_remove(struct dentry *dentry, aufs_bindex_t bindex) | |
80 | { | |
81 | return PTR_ERR(au_diropq_sio(dentry, bindex, !AuDiropq_CREATE)); | |
82 | } | |
83 | ||
84 | #endif /* __KERNEL__ */ | |
85 | #endif /* __AUFS_WHOUT_H__ */ |