2 File: linux/posix_acl.h
4 (C) 2002 Andreas Gruenbacher, <a.gruenbacher@computer.org>
8 #ifndef __LINUX_POSIX_ACL_H
9 #define __LINUX_POSIX_ACL_H
11 #include <linux/bug.h>
12 #include <linux/slab.h>
13 #include <linux/rcupdate.h>
15 #define ACL_UNDEFINED_ID (-1)
17 /* a_type field in acl_user_posix_entry_t */
18 #define ACL_TYPE_ACCESS (0x8000)
19 #define ACL_TYPE_DEFAULT (0x4000)
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)
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)
36 struct posix_acl_entry
{
38 unsigned short e_perm
;
47 struct rcu_head a_rcu
;
49 struct posix_acl_entry a_entries
[0];
52 #define FOREACH_ACL_ENTRY(pa, acl, pe) \
53 for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)
57 * Duplicate an ACL handle.
59 static inline struct posix_acl
*
60 posix_acl_dup(struct posix_acl
*acl
)
63 atomic_inc(&acl
->a_refcount
);
71 posix_acl_release(struct posix_acl
*acl
)
73 if (acl
&& atomic_dec_and_test(&acl
->a_refcount
))
74 kfree_rcu(acl
, a_rcu
);
80 extern void posix_acl_init(struct posix_acl
*, int);
81 extern struct posix_acl
*posix_acl_alloc(int, gfp_t
);
82 extern int posix_acl_valid(struct user_namespace
*, const struct posix_acl
*);
83 extern int posix_acl_permission(struct inode
*, const struct posix_acl
*, int);
84 extern struct posix_acl
*posix_acl_from_mode(umode_t
, gfp_t
);
85 extern int posix_acl_equiv_mode(const struct posix_acl
*, umode_t
*);
86 extern int __posix_acl_create(struct posix_acl
**, gfp_t
, umode_t
*);
87 extern int __posix_acl_chmod(struct posix_acl
**, gfp_t
, umode_t
);
89 extern struct posix_acl
*get_posix_acl(struct inode
*, int);
90 extern int set_posix_acl(struct inode
*, int, struct posix_acl
*);
92 #ifdef CONFIG_FS_POSIX_ACL
93 extern int posix_acl_chmod(struct inode
*, umode_t
);
94 extern int posix_acl_create(struct inode
*, umode_t
*, struct posix_acl
**,
97 extern int simple_set_acl(struct inode
*, struct posix_acl
*, int);
98 extern int simple_acl_create(struct inode
*, struct inode
*);
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
);
106 static inline void cache_no_acl(struct inode
*inode
)
109 inode
->i_default_acl
= NULL
;
112 static inline int posix_acl_chmod(struct inode
*inode
, umode_t mode
)
117 #define simple_set_acl NULL
119 static inline int simple_acl_create(struct inode
*dir
, struct inode
*inode
)
123 static inline void cache_no_acl(struct inode
*inode
)
127 static inline int posix_acl_create(struct inode
*inode
, umode_t
*mode
,
128 struct posix_acl
**default_acl
, struct posix_acl
**acl
)
130 *default_acl
= *acl
= NULL
;
134 static inline void forget_all_cached_acls(struct inode
*inode
)
137 #endif /* CONFIG_FS_POSIX_ACL */
139 struct posix_acl
*get_acl(struct inode
*inode
, int type
);
141 #endif /* __LINUX_POSIX_ACL_H */