xref: /openbmc/linux/include/linux/xattr.h (revision 9d56dd3b083a3bec56e9da35ce07baca81030b03)
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 	int flags;	/* fs private flags passed back to the handlers */
42 	size_t (*list)(struct dentry *dentry, char *list, size_t list_size,
43 		       const char *name, size_t name_len, int handler_flags);
44 	int (*get)(struct dentry *dentry, const char *name, void *buffer,
45 		   size_t size, int handler_flags);
46 	int (*set)(struct dentry *dentry, const char *name, const void *buffer,
47 		   size_t size, int flags, int handler_flags);
48 };
49 
50 ssize_t xattr_getsecurity(struct inode *, const char *, void *, size_t);
51 ssize_t vfs_getxattr(struct dentry *, const char *, void *, size_t);
52 ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
53 int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, int);
54 int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int);
55 int vfs_removexattr(struct dentry *, const char *);
56 
57 ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size);
58 ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
59 int generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags);
60 int generic_removexattr(struct dentry *dentry, const char *name);
61 
62 #endif  /*  __KERNEL__  */
63 
64 #endif	/* _LINUX_XATTR_H */
65