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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 | ||
97d79299 | 12 | #include <uapi/linux/xattr.h> |
1da177e4 LT |
13 | #include <linux/posix_acl.h> |
14 | ||
1da177e4 LT |
15 | /* Supported ACL a_version fields */ |
16 | #define POSIX_ACL_XATTR_VERSION 0x0002 | |
17 | ||
1da177e4 LT |
18 | /* An undefined entry e_id value */ |
19 | #define ACL_UNDEFINED_ID (-1) | |
20 | ||
2211d5ba | 21 | struct posix_acl_xattr_entry { |
f9fd27a2 CH |
22 | __le16 e_tag; |
23 | __le16 e_perm; | |
24 | __le32 e_id; | |
2211d5ba | 25 | }; |
1da177e4 | 26 | |
2211d5ba | 27 | struct posix_acl_xattr_header { |
f9fd27a2 | 28 | __le32 a_version; |
2211d5ba | 29 | }; |
1da177e4 LT |
30 | |
31 | ||
32 | static inline size_t | |
33 | posix_acl_xattr_size(int count) | |
34 | { | |
2211d5ba AG |
35 | return (sizeof(struct posix_acl_xattr_header) + |
36 | (count * sizeof(struct posix_acl_xattr_entry))); | |
1da177e4 LT |
37 | } |
38 | ||
39 | static inline int | |
40 | posix_acl_xattr_count(size_t size) | |
41 | { | |
2211d5ba | 42 | if (size < sizeof(struct posix_acl_xattr_header)) |
1da177e4 | 43 | return -1; |
2211d5ba AG |
44 | size -= sizeof(struct posix_acl_xattr_header); |
45 | if (size % sizeof(struct posix_acl_xattr_entry)) | |
1da177e4 | 46 | return -1; |
2211d5ba | 47 | return size / sizeof(struct posix_acl_xattr_entry); |
1da177e4 LT |
48 | } |
49 | ||
2f6f0654 EB |
50 | #ifdef CONFIG_FS_POSIX_ACL |
51 | void posix_acl_fix_xattr_from_user(void *value, size_t size); | |
52 | void posix_acl_fix_xattr_to_user(void *value, size_t size); | |
53 | #else | |
54 | static inline void posix_acl_fix_xattr_from_user(void *value, size_t size) | |
55 | { | |
56 | } | |
57 | static inline void posix_acl_fix_xattr_to_user(void *value, size_t size) | |
58 | { | |
59 | } | |
60 | #endif | |
61 | ||
5f3a4a28 EB |
62 | struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, |
63 | const void *value, size_t size); | |
64 | int posix_acl_to_xattr(struct user_namespace *user_ns, | |
65 | const struct posix_acl *acl, void *buffer, size_t size); | |
9a59f452 | 66 | |
2aeccbe9 CH |
67 | extern const struct xattr_handler posix_acl_access_xattr_handler; |
68 | extern const struct xattr_handler posix_acl_default_xattr_handler; | |
69 | ||
1da177e4 | 70 | #endif /* _POSIX_ACL_XATTR_H */ |