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; | |
42 | #ifndef CONFIG_UIDGID_STRICT_TYPE_CHECKS | |
43 | unsigned int e_id; | |
44 | #endif | |
45 | }; | |
1da177e4 LT |
46 | }; |
47 | ||
48 | struct posix_acl { | |
3567866b AV |
49 | union { |
50 | atomic_t a_refcount; | |
51 | struct rcu_head a_rcu; | |
52 | }; | |
1da177e4 LT |
53 | unsigned int a_count; |
54 | struct posix_acl_entry a_entries[0]; | |
55 | }; | |
56 | ||
57 | #define FOREACH_ACL_ENTRY(pa, acl, pe) \ | |
58 | for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++) | |
59 | ||
60 | ||
61 | /* | |
62 | * Duplicate an ACL handle. | |
63 | */ | |
64 | static inline struct posix_acl * | |
65 | posix_acl_dup(struct posix_acl *acl) | |
66 | { | |
67 | if (acl) | |
68 | atomic_inc(&acl->a_refcount); | |
69 | return acl; | |
70 | } | |
71 | ||
72 | /* | |
73 | * Free an ACL handle. | |
74 | */ | |
75 | static inline void | |
76 | posix_acl_release(struct posix_acl *acl) | |
77 | { | |
78 | if (acl && atomic_dec_and_test(&acl->a_refcount)) | |
3567866b | 79 | kfree_rcu(acl, a_rcu); |
1da177e4 LT |
80 | } |
81 | ||
82 | ||
83 | /* posix_acl.c */ | |
84 | ||
f61f6da0 | 85 | extern void posix_acl_init(struct posix_acl *, int); |
dd0fc66f | 86 | extern struct posix_acl *posix_acl_alloc(int, gfp_t); |
1da177e4 LT |
87 | extern int posix_acl_valid(const struct posix_acl *); |
88 | extern int posix_acl_permission(struct inode *, const struct posix_acl *, int); | |
3a5fba19 | 89 | extern struct posix_acl *posix_acl_from_mode(umode_t, gfp_t); |
d6952123 | 90 | extern int posix_acl_equiv_mode(const struct posix_acl *, umode_t *); |
d3fb6120 | 91 | extern int posix_acl_create(struct posix_acl **, gfp_t, umode_t *); |
86bc704d | 92 | extern int posix_acl_chmod(struct posix_acl **, gfp_t, umode_t); |
1da177e4 LT |
93 | |
94 | extern struct posix_acl *get_posix_acl(struct inode *, int); | |
95 | extern int set_posix_acl(struct inode *, int, struct posix_acl *); | |
96 | ||
0afaa120 AM |
97 | struct posix_acl **acl_by_type(struct inode *inode, int type); |
98 | struct posix_acl *get_cached_acl(struct inode *inode, int type); | |
99 | struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type); | |
100 | void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl); | |
101 | void forget_cached_acl(struct inode *inode, int type); | |
102 | void forget_all_cached_acls(struct inode *inode); | |
72c04902 AV |
103 | |
104 | static inline void cache_no_acl(struct inode *inode) | |
105 | { | |
106 | #ifdef CONFIG_FS_POSIX_ACL | |
107 | inode->i_acl = NULL; | |
108 | inode->i_default_acl = NULL; | |
109 | #endif | |
110 | } | |
111 | ||
1da177e4 | 112 | #endif /* __LINUX_POSIX_ACL_H */ |