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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 | __le16 e_tag; |
27 | __le16 e_perm; |
28 | __le32 e_id; |
29 | } posix_acl_xattr_entry; |
30 | |
31 | typedef struct { |
32 | __le32 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 | #ifdef CONFIG_FS_POSIX_ACL |
56 | void posix_acl_fix_xattr_from_user(void *value, size_t size); |
57 | void posix_acl_fix_xattr_to_user(void *value, size_t size); |
58 | #else |
59 | static inline void posix_acl_fix_xattr_from_user(void *value, size_t size) |
60 | { |
61 | } |
62 | static inline void posix_acl_fix_xattr_to_user(void *value, size_t size) |
63 | { |
64 | } |
65 | #endif |
66 | |
67 | struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, |
68 | const void *value, size_t size); |
69 | int posix_acl_to_xattr(struct user_namespace *user_ns, |
70 | const struct posix_acl *acl, void *buffer, size_t size); |
71 | |
72 | #endif /* _POSIX_ACL_XATTR_H */ |
73 |
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