Merge tag 'fbdev-for-6.4-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller...
[linux-block.git] / include / linux / posix_acl_xattr.h
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b2441318 1/* SPDX-License-Identifier: GPL-2.0 */
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2/*
3 File: linux/posix_acl_xattr.h
4
5 Extended attribute system call representation of Access Control Lists.
6
7 Copyright (C) 2000 by Andreas Gruenbacher <a.gruenbacher@computer.org>
8 Copyright (C) 2002 SGI - Silicon Graphics, Inc <linux-xfs@oss.sgi.com>
9 */
10#ifndef _POSIX_ACL_XATTR_H
11#define _POSIX_ACL_XATTR_H
12
97d79299 13#include <uapi/linux/xattr.h>
bc8bcf3b 14#include <uapi/linux/posix_acl_xattr.h>
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15#include <linux/posix_acl.h>
16
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17static inline size_t
18posix_acl_xattr_size(int count)
19{
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20 return (sizeof(struct posix_acl_xattr_header) +
21 (count * sizeof(struct posix_acl_xattr_entry)));
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22}
23
24static inline int
25posix_acl_xattr_count(size_t size)
26{
2211d5ba 27 if (size < sizeof(struct posix_acl_xattr_header))
1da177e4 28 return -1;
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29 size -= sizeof(struct posix_acl_xattr_header);
30 if (size % sizeof(struct posix_acl_xattr_entry))
1da177e4 31 return -1;
2211d5ba 32 return size / sizeof(struct posix_acl_xattr_entry);
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33}
34
2f6f0654 35#ifdef CONFIG_FS_POSIX_ACL
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36struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns,
37 const void *value, size_t size);
2f6f0654 38#else
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39static inline struct posix_acl *
40posix_acl_from_xattr(struct user_namespace *user_ns, const void *value,
41 size_t size)
42{
43 return ERR_PTR(-EOPNOTSUPP);
44}
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45#endif
46
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47int posix_acl_to_xattr(struct user_namespace *user_ns,
48 const struct posix_acl *acl, void *buffer, size_t size);
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49static inline const char *posix_acl_xattr_name(int type)
50{
51 switch (type) {
52 case ACL_TYPE_ACCESS:
53 return XATTR_NAME_POSIX_ACL_ACCESS;
54 case ACL_TYPE_DEFAULT:
55 return XATTR_NAME_POSIX_ACL_DEFAULT;
56 }
57
58 return "";
59}
9a59f452 60
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61static inline int posix_acl_type(const char *name)
62{
63 if (strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) == 0)
64 return ACL_TYPE_ACCESS;
65 else if (strcmp(name, XATTR_NAME_POSIX_ACL_DEFAULT) == 0)
66 return ACL_TYPE_DEFAULT;
67
68 return -1;
69}
70
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71/* These are legacy handlers. Don't use them for new code. */
72extern const struct xattr_handler nop_posix_acl_access;
73extern const struct xattr_handler nop_posix_acl_default;
2aeccbe9 74
1da177e4 75#endif /* _POSIX_ACL_XATTR_H */