1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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 | |
13 | #include <uapi/linux/xattr.h> |
14 | #include <uapi/linux/posix_acl_xattr.h> |
15 | #include <linux/posix_acl.h> |
16 | |
17 | static inline size_t |
18 | posix_acl_xattr_size(int count) |
19 | { |
20 | return (sizeof(struct posix_acl_xattr_header) + |
21 | (count * sizeof(struct posix_acl_xattr_entry))); |
22 | } |
23 | |
24 | static inline int |
25 | posix_acl_xattr_count(size_t size) |
26 | { |
27 | if (size < sizeof(struct posix_acl_xattr_header)) |
28 | return -1; |
29 | size -= sizeof(struct posix_acl_xattr_header); |
30 | if (size % sizeof(struct posix_acl_xattr_entry)) |
31 | return -1; |
32 | return size / sizeof(struct posix_acl_xattr_entry); |
33 | } |
34 | |
35 | #ifdef CONFIG_FS_POSIX_ACL |
36 | struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, |
37 | const void *value, size_t size); |
38 | #else |
39 | static inline struct posix_acl * |
40 | posix_acl_from_xattr(struct user_namespace *user_ns, const void *value, |
41 | size_t size) |
42 | { |
43 | return ERR_PTR(-EOPNOTSUPP); |
44 | } |
45 | #endif |
46 | |
47 | int posix_acl_to_xattr(struct user_namespace *user_ns, |
48 | const struct posix_acl *acl, void *buffer, size_t size); |
49 | static 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 | } |
60 | |
61 | static 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 | |
71 | /* These are legacy handlers. Don't use them for new code. */ |
72 | extern const struct xattr_handler nop_posix_acl_access; |
73 | extern const struct xattr_handler nop_posix_acl_default; |
74 | |
75 | #endif /* _POSIX_ACL_XATTR_H */ |
76 | |