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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
14#include <linux/slab.h>
15#include <linux/types.h>
16#include <linux/spinlock.h>
17#include <uapi/linux/xattr.h>
18
19struct inode;
20struct dentry;
21
22struct xattr_handler {
23 const char *prefix;
24 int flags; /* fs private flags */
25 size_t (*list)(const struct xattr_handler *, struct dentry *dentry,
26 char *list, size_t list_size, const char *name,
27 size_t name_len);
28 int (*get)(const struct xattr_handler *, struct dentry *dentry,
29 const char *name, void *buffer, size_t size);
30 int (*set)(const struct xattr_handler *, struct dentry *dentry,
31 const char *name, const void *buffer, size_t size,
32 int flags);
33};
34
35const char *xattr_full_name(const struct xattr_handler *, const char *);
36
37struct xattr {
38 const char *name;
39 void *value;
40 size_t value_len;
41};
42
43ssize_t xattr_getsecurity(struct inode *, const char *, void *, size_t);
44ssize_t vfs_getxattr(struct dentry *, const char *, void *, size_t);
45ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
46int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, int);
47int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int);
48int vfs_removexattr(struct dentry *, const char *);
49
50ssize_t generic_getxattr(struct dentry *dentry, const char *name, void *buffer, size_t size);
51ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
52int generic_setxattr(struct dentry *dentry, const char *name, const void *value, size_t size, int flags);
53int generic_removexattr(struct dentry *dentry, const char *name);
54ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
55 char **xattr_value, size_t size, gfp_t flags);
56int vfs_xattr_cmp(struct dentry *dentry, const char *xattr_name,
57 const char *value, size_t size, gfp_t flags);
58
59struct simple_xattrs {
60 struct list_head head;
61 spinlock_t lock;
62};
63
64struct simple_xattr {
65 struct list_head list;
66 char *name;
67 size_t size;
68 char value[0];
69};
70
71/*
72 * initialize the simple_xattrs structure
73 */
74static inline void simple_xattrs_init(struct simple_xattrs *xattrs)
75{
76 INIT_LIST_HEAD(&xattrs->head);
77 spin_lock_init(&xattrs->lock);
78}
79
80/*
81 * free all the xattrs
82 */
83static inline void simple_xattrs_free(struct simple_xattrs *xattrs)
84{
85 struct simple_xattr *xattr, *node;
86
87 list_for_each_entry_safe(xattr, node, &xattrs->head, list) {
88 kfree(xattr->name);
89 kfree(xattr);
90 }
91}
92
93struct simple_xattr *simple_xattr_alloc(const void *value, size_t size);
94int simple_xattr_get(struct simple_xattrs *xattrs, const char *name,
95 void *buffer, size_t size);
96int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
97 const void *value, size_t size, int flags);
98int simple_xattr_remove(struct simple_xattrs *xattrs, const char *name);
99ssize_t simple_xattr_list(struct simple_xattrs *xattrs, char *buffer,
100 size_t size);
101void simple_xattr_list_add(struct simple_xattrs *xattrs,
102 struct simple_xattr *new_xattr);
103
104#endif /* _LINUX_XATTR_H */