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[linux-3.10.git] / fs / ext2 / xattr_trusted.c
1 /*
2  * linux/fs/ext2/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 "ext2.h"
9 #include "xattr.h"
10
11 static size_t
12 ext2_xattr_trusted_list(struct dentry *dentry, char *list, size_t list_size,
13                 const char *name, size_t name_len, int type)
14 {
15         const int prefix_len = XATTR_TRUSTED_PREFIX_LEN;
16         const size_t total_len = prefix_len + name_len + 1;
17
18         if (!capable(CAP_SYS_ADMIN))
19                 return 0;
20
21         if (list && total_len <= list_size) {
22                 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
23                 memcpy(list+prefix_len, name, name_len);
24                 list[prefix_len + name_len] = '\0';
25         }
26         return total_len;
27 }
28
29 static int
30 ext2_xattr_trusted_get(struct dentry *dentry, const char *name,
31                 void *buffer, size_t size, int type)
32 {
33         if (strcmp(name, "") == 0)
34                 return -EINVAL;
35         return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
36                               buffer, size);
37 }
38
39 static int
40 ext2_xattr_trusted_set(struct dentry *dentry, const char *name,
41                 const void *value, size_t size, int flags, int type)
42 {
43         if (strcmp(name, "") == 0)
44                 return -EINVAL;
45         return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_TRUSTED, name,
46                               value, size, flags);
47 }
48
49 const struct xattr_handler ext2_xattr_trusted_handler = {
50         .prefix = XATTR_TRUSTED_PREFIX,
51         .list   = ext2_xattr_trusted_list,
52         .get    = ext2_xattr_trusted_get,
53         .set    = ext2_xattr_trusted_set,
54 };