Commit | Line | Data |
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1da177e4 LT |
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 { | |
f9fd27a2 CH |
26 | __le16 e_tag; |
27 | __le16 e_perm; | |
28 | __le32 e_id; | |
1da177e4 LT |
29 | } posix_acl_xattr_entry; |
30 | ||
31 | typedef struct { | |
f9fd27a2 | 32 | __le32 a_version; |
1da177e4 LT |
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 | ||
9a59f452 CH |
55 | struct posix_acl *posix_acl_from_xattr(const void *value, size_t size); |
56 | int posix_acl_to_xattr(const struct posix_acl *acl, void *buffer, size_t size); | |
57 | ||
1da177e4 | 58 | #endif /* _POSIX_ACL_XATTR_H */ |