Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | File: linux/posix_acl.h | |
3 | ||
4 | (C) 2002 Andreas Gruenbacher, <a.gruenbacher@computer.org> | |
5 | */ | |
6 | ||
7 | ||
8 | #ifndef __LINUX_POSIX_ACL_H | |
9 | #define __LINUX_POSIX_ACL_H | |
10 | ||
187f1882 | 11 | #include <linux/bug.h> |
1da177e4 | 12 | #include <linux/slab.h> |
3567866b | 13 | #include <linux/rcupdate.h> |
1da177e4 LT |
14 | |
15 | #define ACL_UNDEFINED_ID (-1) | |
16 | ||
17 | /* a_type field in acl_user_posix_entry_t */ | |
18 | #define ACL_TYPE_ACCESS (0x8000) | |
19 | #define ACL_TYPE_DEFAULT (0x4000) | |
20 | ||
21 | /* e_tag entry in struct posix_acl_entry */ | |
22 | #define ACL_USER_OBJ (0x01) | |
23 | #define ACL_USER (0x02) | |
24 | #define ACL_GROUP_OBJ (0x04) | |
25 | #define ACL_GROUP (0x08) | |
26 | #define ACL_MASK (0x10) | |
27 | #define ACL_OTHER (0x20) | |
28 | ||
29 | /* permissions in the e_perm field */ | |
30 | #define ACL_READ (0x04) | |
31 | #define ACL_WRITE (0x02) | |
32 | #define ACL_EXECUTE (0x01) | |
33 | //#define ACL_ADD (0x08) | |
34 | //#define ACL_DELETE (0x10) | |
35 | ||
36 | struct posix_acl_entry { | |
37 | short e_tag; | |
38 | unsigned short e_perm; | |
2f6f0654 EB |
39 | union { |
40 | kuid_t e_uid; | |
41 | kgid_t e_gid; | |
2f6f0654 | 42 | }; |
1da177e4 LT |
43 | }; |
44 | ||
45 | struct posix_acl { | |
6d4e56ce JL |
46 | atomic_t a_refcount; |
47 | struct rcu_head a_rcu; | |
1da177e4 LT |
48 | unsigned int a_count; |
49 | struct posix_acl_entry a_entries[0]; | |
50 | }; | |
51 | ||
52 | #define FOREACH_ACL_ENTRY(pa, acl, pe) \ | |
53 | for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++) | |
54 | ||
55 | ||
56 | /* | |
57 | * Duplicate an ACL handle. | |
58 | */ | |
59 | static inline struct posix_acl * | |
60 | posix_acl_dup(struct posix_acl *acl) | |
61 | { | |
62 | if (acl) | |
63 | atomic_inc(&acl->a_refcount); | |
64 | return acl; | |
65 | } | |
66 | ||
67 | /* | |
68 | * Free an ACL handle. | |
69 | */ | |
70 | static inline void | |
71 | posix_acl_release(struct posix_acl *acl) | |
72 | { | |
73 | if (acl && atomic_dec_and_test(&acl->a_refcount)) | |
3567866b | 74 | kfree_rcu(acl, a_rcu); |
1da177e4 LT |
75 | } |
76 | ||
77 | ||
78 | /* posix_acl.c */ | |
79 | ||
f61f6da0 | 80 | extern void posix_acl_init(struct posix_acl *, int); |
dd0fc66f | 81 | extern struct posix_acl *posix_acl_alloc(int, gfp_t); |
1da177e4 LT |
82 | extern int posix_acl_valid(const struct posix_acl *); |
83 | extern int posix_acl_permission(struct inode *, const struct posix_acl *, int); | |
3a5fba19 | 84 | extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t); |
d6952123 | 85 | extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *); |
37bc1539 | 86 | extern int __posix_acl_create(struct posix_acl **, gfp_t, umode_t *); |
5bf3258f | 87 | extern int __posix_acl_chmod(struct posix_acl **, gfp_t, umode_t); |
1da177e4 LT |
88 | |
89 | extern struct posix_acl *get_posix_acl(struct inode *, int); | |
90 | extern int set_posix_acl(struct inode *, int, struct posix_acl *); | |
91 | ||
641cf4a6 | 92 | #ifdef CONFIG_FS_POSIX_ACL |
37bc1539 CH |
93 | extern int posix_acl_chmod(struct inode *, umode_t); |
94 | extern int posix_acl_create(struct inode *, umode_t *, struct posix_acl **, | |
95 | struct posix_acl **); | |
5bf3258f | 96 | |
feda821e CH |
97 | extern int simple_set_acl(struct inode *, struct posix_acl *, int); |
98 | extern int simple_acl_create(struct inode *, struct inode *); | |
99 | ||
0afaa120 AM |
100 | struct posix_acl *get_cached_acl(struct inode *inode, int type); |
101 | struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type); | |
102 | void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl); | |
103 | void forget_cached_acl(struct inode *inode, int type); | |
104 | void forget_all_cached_acls(struct inode *inode); | |
72c04902 AV |
105 | |
106 | static inline void cache_no_acl(struct inode *inode) | |
107 | { | |
72c04902 AV |
108 | inode->i_acl = NULL; |
109 | inode->i_default_acl = NULL; | |
72c04902 | 110 | } |
5bf3258f | 111 | #else |
37bc1539 | 112 | static inline int posix_acl_chmod(struct inode *inode, umode_t mode) |
5bf3258f CH |
113 | { |
114 | return 0; | |
115 | } | |
116 | ||
feda821e CH |
117 | #define simple_set_acl NULL |
118 | ||
119 | static inline int simple_acl_create(struct inode *dir, struct inode *inode) | |
120 | { | |
121 | return 0; | |
122 | } | |
5bf3258f CH |
123 | static inline void cache_no_acl(struct inode *inode) |
124 | { | |
125 | } | |
37bc1539 CH |
126 | |
127 | static inline int posix_acl_create(struct inode *inode, umode_t *mode, | |
128 | struct posix_acl **default_acl, struct posix_acl **acl) | |
129 | { | |
130 | *default_acl = *acl = NULL; | |
131 | return 0; | |
132 | } | |
013cdf10 CH |
133 | |
134 | static inline void forget_all_cached_acls(struct inode *inode) | |
135 | { | |
136 | } | |
5bf3258f | 137 | #endif /* CONFIG_FS_POSIX_ACL */ |
72c04902 | 138 | |
2982baa2 | 139 | struct posix_acl *get_acl(struct inode *inode, int type); |
72c04902 | 140 | |
1da177e4 | 141 | #endif /* __LINUX_POSIX_ACL_H */ |