Merge tag 'landlock-6.0-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/mic...
[linux-2.6-microblaze.git] / include / linux / posix_acl_xattr.h
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 void posix_acl_fix_xattr_from_user(void *value, size_t size);
37 void posix_acl_fix_xattr_to_user(void *value, size_t size);
38 void posix_acl_getxattr_idmapped_mnt(struct user_namespace *mnt_userns,
39                                      const struct inode *inode,
40                                      void *value, size_t size);
41 void posix_acl_setxattr_idmapped_mnt(struct user_namespace *mnt_userns,
42                                      const struct inode *inode,
43                                      void *value, size_t size);
44 #else
45 static inline void posix_acl_fix_xattr_from_user(void *value, size_t size)
46 {
47 }
48 static inline void posix_acl_fix_xattr_to_user(void *value, size_t size)
49 {
50 }
51 static inline void
52 posix_acl_getxattr_idmapped_mnt(struct user_namespace *mnt_userns,
53                                 const struct inode *inode, void *value,
54                                 size_t size)
55 {
56 }
57 static inline void
58 posix_acl_setxattr_idmapped_mnt(struct user_namespace *mnt_userns,
59                                 const struct inode *inode, void *value,
60                                 size_t size)
61 {
62 }
63 #endif
64
65 struct posix_acl *posix_acl_from_xattr(struct user_namespace *user_ns, 
66                                        const void *value, size_t size);
67 int posix_acl_to_xattr(struct user_namespace *user_ns,
68                        const struct posix_acl *acl, void *buffer, size_t size);
69
70 extern const struct xattr_handler posix_acl_access_xattr_handler;
71 extern const struct xattr_handler posix_acl_default_xattr_handler;
72
73 #endif  /* _POSIX_ACL_XATTR_H */