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linux
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 <uapi/linux/xattr.h>
13#include <uapi/linux/posix_acl_xattr.h>
14#include <linux/posix_acl.h>
15
16static inline size_t
17posix_acl_xattr_size(int count)
18{
19 return (sizeof(struct posix_acl_xattr_header) +
20 (count * sizeof(struct posix_acl_xattr_entry)));
21}
22
23static inline int
24posix_acl_xattr_count(size_t size)
25{
26 if (size < sizeof(struct posix_acl_xattr_header))
27 return -1;
28 size -= sizeof(struct posix_acl_xattr_header);
29 if (size % sizeof(struct posix_acl_xattr_entry))
30 return -1;
31 return size / sizeof(struct posix_acl_xattr_entry);
32}
33
34#ifdef CONFIG_FS_POSIX_ACL
35void posix_acl_fix_xattr_from_user(void *value, size_t size);
36void posix_acl_fix_xattr_to_user(void *value, size_t size);
37#else
38static inline void posix_acl_fix_xattr_from_user(void *value, size_t size)
39{
40}
41static inline void posix_acl_fix_xattr_to_user(void *value, size_t size)
42{
43}
44#endif
45
46struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns,
47 const void *value, size_t size);
48int posix_acl_to_xattr(struct user_namespace *user_ns,
49 const struct posix_acl *acl, void *buffer, size_t size);
50
51extern const struct xattr_handler posix_acl_access_xattr_handler;
52extern const struct xattr_handler posix_acl_default_xattr_handler;
53
54#endif /* _POSIX_ACL_XATTR_H */