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
34struct posix_acl_entry {
35	short			e_tag;
36	unsigned short		e_perm;
37	unsigned int		e_id;
38};
39
40struct 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 */
53static inline struct posix_acl *
54posix_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 */
64static inline void
65posix_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
74extern struct posix_acl *posix_acl_alloc(int, gfp_t);
75extern struct posix_acl *posix_acl_clone(const struct posix_acl *, gfp_t);
76extern int posix_acl_valid(const struct posix_acl *);
77extern int posix_acl_permission(struct inode *, const struct posix_acl *, int);
78extern struct posix_acl *posix_acl_from_mode(mode_t, gfp_t);
79extern int posix_acl_equiv_mode(const struct posix_acl *, mode_t *);
80extern int posix_acl_create_masq(struct posix_acl *, mode_t *);
81extern int posix_acl_chmod_masq(struct posix_acl *, mode_t);
82
83extern struct posix_acl *get_posix_acl(struct inode *, int);
84extern int set_posix_acl(struct inode *, int, struct posix_acl *);
85
86#endif  /* __LINUX_POSIX_ACL_H */
87