4 Extended attributes handling.
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>
10 #ifndef _LINUX_XATTR_H
11 #define _LINUX_XATTR_H
14 #include <linux/slab.h>
15 #include <linux/types.h>
16 #include <linux/spinlock.h>
17 #include <uapi/linux/xattr.h>
23 * struct xattr_handler: When @name is set, match attributes with exactly that
24 * name. When @prefix is set instead, match attributes with that prefix and
25 * with a non-empty suffix.
27 struct xattr_handler
{
30 int flags
; /* fs private flags */
31 bool (*list
)(struct dentry
*dentry
);
32 int (*get
)(const struct xattr_handler
*, struct dentry
*dentry
,
33 struct inode
*inode
, const char *name
, void *buffer
,
35 int (*set
)(const struct xattr_handler
*, struct dentry
*dentry
,
36 struct inode
*inode
, const char *name
, const void *buffer
,
37 size_t size
, int flags
);
40 const char *xattr_full_name(const struct xattr_handler
*, const char *);
48 ssize_t
xattr_getsecurity(struct inode
*, const char *, void *, size_t);
49 ssize_t
__vfs_getxattr(struct dentry
*, struct inode
*, const char *, void *, size_t);
50 ssize_t
vfs_getxattr(struct dentry
*, const char *, void *, size_t);
51 ssize_t
vfs_listxattr(struct dentry
*d
, char *list
, size_t size
);
52 int __vfs_setxattr(struct dentry
*, struct inode
*, const char *, const void *, size_t, int);
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 int vfs_removexattr(struct dentry
*, const char *);
58 ssize_t
generic_listxattr(struct dentry
*dentry
, char *buffer
, size_t buffer_size
);
59 ssize_t
vfs_getxattr_alloc(struct dentry
*dentry
, const char *name
,
60 char **xattr_value
, size_t size
, gfp_t flags
);
62 static inline const char *xattr_prefix(const struct xattr_handler
*handler
)
64 return handler
->prefix
?: handler
->name
;
67 struct simple_xattrs
{
68 struct list_head head
;
73 struct list_head list
;
80 * initialize the simple_xattrs structure
82 static inline void simple_xattrs_init(struct simple_xattrs
*xattrs
)
84 INIT_LIST_HEAD(&xattrs
->head
);
85 spin_lock_init(&xattrs
->lock
);
91 static inline void simple_xattrs_free(struct simple_xattrs
*xattrs
)
93 struct simple_xattr
*xattr
, *node
;
95 list_for_each_entry_safe(xattr
, node
, &xattrs
->head
, list
) {
101 struct simple_xattr
*simple_xattr_alloc(const void *value
, size_t size
);
102 int simple_xattr_get(struct simple_xattrs
*xattrs
, const char *name
,
103 void *buffer
, size_t size
);
104 int simple_xattr_set(struct simple_xattrs
*xattrs
, const char *name
,
105 const void *value
, size_t size
, int flags
);
106 ssize_t
simple_xattr_list(struct inode
*inode
, struct simple_xattrs
*xattrs
, char *buffer
,
108 void simple_xattr_list_add(struct simple_xattrs
*xattrs
,
109 struct simple_xattr
*new_xattr
);
111 #endif /* _LINUX_XATTR_H */