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
11 #include <linux/slab.h>
12
13 #define ACL_UNDEFINED_ID (-1)
14
15 /* a_type field in acl_user_posix_entry_t */
16 #define ACL_TYPE_ACCESS (0x8000)
17 #define ACL_TYPE_DEFAULT (0x4000)
18
19 /* e_tag entry in struct posix_acl_entry */
20 #define ACL_USER_OBJ (0x01)
21 #define ACL_USER (0x02)
22 #define ACL_GROUP_OBJ (0x04)
23 #define ACL_GROUP (0x08)
24 #define ACL_MASK (0x10)
25 #define ACL_OTHER (0x20)
26
27 /* permissions in the e_perm field */
28 #define ACL_READ (0x04)
29 #define ACL_WRITE (0x02)
30 #define ACL_EXECUTE (0x01)
31 //#define ACL_ADD (0x08)
32 //#define ACL_DELETE (0x10)
33
34 struct posix_acl_entry {
35 short e_tag;
36 unsigned short e_perm;
37 unsigned int e_id;
38 };
39
40 struct posix_acl {
41 atomic_t a_refcount;
42 unsigned int a_count;
43 struct posix_acl_entry a_entries[0];
44 };
45
46 #define FOREACH_ACL_ENTRY(pa, acl, pe) \
47 for(pa=(acl)->a_entries, pe=pa+(acl)->a_count; pa<pe; pa++)
48
49
50 /*
51 * Duplicate an ACL handle.
52 */
53 static inline struct posix_acl *
54 posix_acl_dup(struct posix_acl *acl)
55 {
56 if (acl)
57 atomic_inc(&acl->a_refcount);
58 return acl;
59 }
60
61 /*
62 * Free an ACL handle.
63 */
64 static inline void
65 posix_acl_release(struct posix_acl *acl)
66 {
67 if (acl && atomic_dec_and_test(&acl->a_refcount))
68 kfree(acl);
69 }
70
71
72 /* posix_acl.c */
73
74 extern struct posix_acl *posix_acl_alloc(int, int);
75 extern struct posix_acl *posix_acl_clone(const struct posix_acl *, int);
76 extern int posix_acl_valid(const struct posix_acl *);
77 extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
78 extern struct posix_acl *posix_acl_from_mode(mode_t, int);
79 extern int posix_acl_equiv_mode(const struct posix_acl *, mode_t *);
80 extern int posix_acl_create_masq(struct posix_acl *, mode_t *);
81 extern int posix_acl_chmod_masq(struct posix_acl *, mode_t);
82
83 extern struct posix_acl *get_posix_acl(struct inode *, int);
84 extern int set_posix_acl(struct inode *, int, struct posix_acl *);
85
86 #endif /* __LINUX_POSIX_ACL_H */
87
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