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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
22/*
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.
26 */
27struct xattr_handler {
28 const char *name;
29 const char *prefix;
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,
34 size_t size);
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);
38};
39
40const char *xattr_full_name(const struct xattr_handler *, const char *);
41
42struct xattr {
43 const char *name;
44 void *value;
45 size_t value_len;
46};
47
48ssize_t xattr_getsecurity(struct inode *, const char *, void *, size_t);
49ssize_t vfs_getxattr(struct dentry *, const char *, void *, size_t);
50ssize_t vfs_listxattr(struct dentry *d, char *list, size_t size);
51int __vfs_setxattr_noperm(struct dentry *, const char *, const void *, size_t, int);
52int vfs_setxattr(struct dentry *, const char *, const void *, size_t, int);
53int vfs_removexattr(struct dentry *, const char *);
54
55ssize_t generic_getxattr(struct dentry *dentry, struct inode *inode, const char *name, void *buffer, size_t size);
56ssize_t generic_listxattr(struct dentry *dentry, char *buffer, size_t buffer_size);
57int generic_setxattr(struct dentry *dentry, struct inode *inode,
58 const char *name, const void *value, size_t size, int flags);
59int generic_removexattr(struct dentry *dentry, const char *name);
60ssize_t vfs_getxattr_alloc(struct dentry *dentry, const char *name,
61 char **xattr_value, size_t size, gfp_t flags);
62
63static inline const char *xattr_prefix(const struct xattr_handler *handler)
64{
65 return handler->prefix ?: handler->name;
66}
67
68struct simple_xattrs {
69 struct list_head head;
70 spinlock_t lock;
71};
72
73struct simple_xattr {
74 struct list_head list;
75 char *name;
76 size_t size;
77 char value[0];
78};
79
80/*
81 * initialize the simple_xattrs structure
82 */
83static inline void simple_xattrs_init(struct simple_xattrs *xattrs)
84{
85 INIT_LIST_HEAD(&xattrs->head);
86 spin_lock_init(&xattrs->lock);
87}
88
89/*
90 * free all the xattrs
91 */
92static inline void simple_xattrs_free(struct simple_xattrs *xattrs)
93{
94 struct simple_xattr *xattr, *node;
95
96 list_for_each_entry_safe(xattr, node, &xattrs->head, list) {
97 kfree(xattr->name);
98 kfree(xattr);
99 }
100}
101
102struct simple_xattr *simple_xattr_alloc(const void *value, size_t size);
103int simple_xattr_get(struct simple_xattrs *xattrs, const char *name,
104 void *buffer, size_t size);
105int simple_xattr_set(struct simple_xattrs *xattrs, const char *name,
106 const void *value, size_t size, int flags);
107ssize_t simple_xattr_list(struct inode *inode, struct simple_xattrs *xattrs, char *buffer,
108 size_t size);
109void simple_xattr_list_add(struct simple_xattrs *xattrs,
110 struct simple_xattr *new_xattr);
111
112#endif /* _LINUX_XATTR_H */