Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-2.6] / fs / ext3 / xattr_trusted.c
1 /*
2  * linux/fs/ext3/xattr_trusted.c
3  * Handler for trusted extended attributes.
4  *
5  * Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
6  */
7
8 #include <linux/module.h>
9 #include <linux/string.h>
10 #include <linux/capability.h>
11 #include <linux/fs.h>
12 #include <linux/ext3_jbd.h>
13 #include <linux/ext3_fs.h>
14 #include "xattr.h"
15
16 #define XATTR_TRUSTED_PREFIX "trusted."
17
18 static size_t
19 ext3_xattr_trusted_list(struct inode *inode, char *list, size_t list_size,
20                         const char *name, size_t name_len)
21 {
22         const size_t prefix_len = sizeof(XATTR_TRUSTED_PREFIX)-1;
23         const size_t total_len = prefix_len + name_len + 1;
24
25         if (!capable(CAP_SYS_ADMIN))
26                 return 0;
27
28         if (list && total_len <= list_size) {
29                 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
30                 memcpy(list+prefix_len, name, name_len);
31                 list[prefix_len + name_len] = '\0';
32         }
33         return total_len;
34 }
35
36 static int
37 ext3_xattr_trusted_get(struct inode *inode, const char *name,
38                        void *buffer, size_t size)
39 {
40         if (strcmp(name, "") == 0)
41                 return -EINVAL;
42         return ext3_xattr_get(inode, EXT3_XATTR_INDEX_TRUSTED, name,
43                               buffer, size);
44 }
45
46 static int
47 ext3_xattr_trusted_set(struct inode *inode, const char *name,
48                        const void *value, size_t size, int flags)
49 {
50         if (strcmp(name, "") == 0)
51                 return -EINVAL;
52         return ext3_xattr_set(inode, EXT3_XATTR_INDEX_TRUSTED, name,
53                               value, size, flags);
54 }
55
56 struct xattr_handler ext3_xattr_trusted_handler = {
57         .prefix = XATTR_TRUSTED_PREFIX,
58         .list   = ext3_xattr_trusted_list,
59         .get    = ext3_xattr_trusted_get,
60         .set    = ext3_xattr_trusted_set,
61 };