1 /*
2 File: linux/posix_acl_xattr.h
3
4 Extended attribute system call representation of Access Control Lists.
5
6 Copyright (C) 2000 by Andreas Gruenbacher <a.gruenbacher@computer.org>
7 Copyright (C) 2002 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com>
8 */
9 #ifndef _POSIX_ACL_XATTR_H
10 #define _POSIX_ACL_XATTR_H
11
12 #include <linux/posix_acl.h>
13
14 /* Extended attribute names */
15 #define POSIX_ACL_XATTR_ACCESS "system.posix_acl_access"
16 #define POSIX_ACL_XATTR_DEFAULT "system.posix_acl_default"
17
18 /* Supported ACL a_version fields */
19 #define POSIX_ACL_XATTR_VERSION 0x0002
20
21
22 /* An undefined entry e_id value */
23 #define ACL_UNDEFINED_ID (-1)
24
25 typedef struct {
26 __u16 e_tag;
27 __u16 e_perm;
28 __u32 e_id;
29 } posix_acl_xattr_entry;
30
31 typedef struct {
32 __u32 a_version;
33 posix_acl_xattr_entry a_entries[0];
34 } posix_acl_xattr_header;
35
36
37 static inline size_t
38 posix_acl_xattr_size(int count)
39 {
40 return (sizeof(posix_acl_xattr_header) +
41 (count * sizeof(posix_acl_xattr_entry)));
42 }
43
44 static inline int
45 posix_acl_xattr_count(size_t size)
46 {
47 if (size < sizeof(posix_acl_xattr_header))
48 return -1;
49 size -= sizeof(posix_acl_xattr_header);
50 if (size % sizeof(posix_acl_xattr_entry))
51 return -1;
52 return size / sizeof(posix_acl_xattr_entry);
53 }
54
55 #endif /* _POSIX_ACL_XATTR_H */
56
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