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c088e31d SF |
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 | * sysfs interface and mount lifetime management | |
20 | */ | |
21 | ||
22 | #ifndef __SYSAUFS_H__ | |
23 | #define __SYSAUFS_H__ | |
24 | ||
25 | #ifdef __KERNEL__ | |
26 | ||
27 | #include <linux/sysfs.h> | |
28 | #include "module.h" | |
29 | ||
30 | struct super_block; | |
31 | struct au_sbinfo; | |
32 | ||
33 | struct sysaufs_si_attr { | |
34 | struct attribute attr; | |
35 | int (*show)(struct seq_file *seq, struct super_block *sb); | |
36 | }; | |
37 | ||
38 | /* ---------------------------------------------------------------------- */ | |
39 | ||
40 | /* sysaufs.c */ | |
41 | extern unsigned long sysaufs_si_mask; | |
42 | extern struct kset *sysaufs_kset; | |
43 | extern struct attribute *sysaufs_si_attrs[]; | |
44 | int sysaufs_si_init(struct au_sbinfo *sbinfo); | |
45 | int __init sysaufs_init(void); | |
46 | void sysaufs_fin(void); | |
47 | ||
48 | /* ---------------------------------------------------------------------- */ | |
49 | ||
50 | /* some people doesn't like to show a pointer in kernel */ | |
51 | static inline unsigned long sysaufs_si_id(struct au_sbinfo *sbinfo) | |
52 | { | |
53 | return sysaufs_si_mask ^ (unsigned long)sbinfo; | |
54 | } | |
55 | ||
56 | #define SysaufsSiNamePrefix "si_" | |
57 | #define SysaufsSiNameLen (sizeof(SysaufsSiNamePrefix) + 16) | |
58 | static inline void sysaufs_name(struct au_sbinfo *sbinfo, char *name) | |
59 | { | |
60 | snprintf(name, SysaufsSiNameLen, SysaufsSiNamePrefix "%lx", | |
61 | sysaufs_si_id(sbinfo)); | |
62 | } | |
63 | ||
64 | struct au_branch; | |
65 | #ifdef CONFIG_SYSFS | |
66 | /* sysfs.c */ | |
67 | extern struct attribute_group *sysaufs_attr_group; | |
68 | ||
69 | int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb); | |
70 | ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr, | |
71 | char *buf); | |
72 | long au_brinfo_ioctl(struct file *file, unsigned long arg); | |
73 | #ifdef CONFIG_COMPAT | |
74 | long au_brinfo_compat_ioctl(struct file *file, unsigned long arg); | |
75 | #endif | |
76 | ||
77 | void sysaufs_br_init(struct au_branch *br); | |
78 | void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex); | |
79 | void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex); | |
80 | ||
81 | #define sysaufs_brs_init() do {} while (0) | |
82 | ||
83 | #else | |
84 | #define sysaufs_attr_group NULL | |
85 | ||
86 | AuStubInt0(sysaufs_si_xi_path, struct seq_file *seq, struct super_block *sb) | |
87 | AuStub(ssize_t, sysaufs_si_show, return 0, struct kobject *kobj, | |
88 | struct attribute *attr, char *buf) | |
89 | AuStubVoid(sysaufs_br_init, struct au_branch *br) | |
90 | AuStubVoid(sysaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex) | |
91 | AuStubVoid(sysaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex) | |
92 | ||
93 | static inline void sysaufs_brs_init(void) | |
94 | { | |
95 | sysaufs_brs = 0; | |
96 | } | |
97 | ||
98 | #endif /* CONFIG_SYSFS */ | |
99 | ||
100 | #endif /* __KERNEL__ */ | |
101 | #endif /* __SYSAUFS_H__ */ |