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