xref: /openbmc/linux/include/linux/xattr.h (revision e868d61272caa648214046a096e5a6bfc068dc8c)
1 /*
2   File: linux/xattr.h
3 
4   Extended attributes handling.
5 
6   Copyright (C) 2001 by Andreas Gruenbacher <a.gruenbacher@computer.org>
7   Copyright (c) 2001-2002 Silicon Graphics, Inc.  All Rights Reserved.
8   Copyright (c) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
9 */
10 #ifndef _LINUX_XATTR_H
11 #define _LINUX_XATTR_H
12 
13 #define XATTR_CREATE	0x1	/* set value, fail if attr already exists */
14 #define XATTR_REPLACE	0x2	/* set value, fail if attr does not exist */
15 
16 #ifdef  __KERNEL__
17 
18 #include <linux/types.h>
19 
20 /* Namespaces */
21 #define XATTR_OS2_PREFIX "os2."
22 #define XATTR_OS2_PREFIX_LEN (sizeof (XATTR_OS2_PREFIX) - 1)
23 
24 #define XATTR_SECURITY_PREFIX	"security."
25 #define XATTR_SECURITY_PREFIX_LEN (sizeof (XATTR_SECURITY_PREFIX) - 1)
26 
27 #define XATTR_SYSTEM_PREFIX "system."
28 #define XATTR_SYSTEM_PREFIX_LEN (sizeof (XATTR_SYSTEM_PREFIX) - 1)
29 
30 #define XATTR_TRUSTED_PREFIX "trusted."
31 #define XATTR_TRUSTED_PREFIX_LEN (sizeof (XATTR_TRUSTED_PREFIX) - 1)
32 
33 #define XATTR_USER_PREFIX "user."
34 #define XATTR_USER_PREFIX_LEN (sizeof (XATTR_USER_PREFIX) - 1)
35 
36 struct inode;
37 struct dentry;
38 
39 struct xattr_handler {
40 	char *prefix;
41 	size_t (*list)(struct inode *inode, char *list, size_t list_size,
42 		       const char *name, size_t name_len);
43 	int (*get)(struct inode *inode, const char *name, void *buffer,
44 		   size_t size);
45 	int (*set)(struct inode *inode, const char *name, const void *buffer,
46 		   size_t size, int flags);
47 };
48 
49 ssize_t vfs_getxattr(struct dentry *, char *, void *, size_t);
50 ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
51 int vfs_setxattr(struct dentry *, char *, void *, size_t, int);
52 int vfs_removexattr(struct dentry *, char *);
53 
54 ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size);
55 ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
56 int generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags);
57 int generic_removexattr(struct dentry *dentry, const char *name);
58 
59 #endif  /*  __KERNEL__  */
60 
61 #endif	/* _LINUX_XATTR_H */
62