xref: /openbmc/linux/include/linux/posix_acl.h (revision 384740dc)
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, gfp_t);
75 extern struct posix_acl *posix_acl_clone(const struct posix_acl *, gfp_t);
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, gfp_t);
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