Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...
[pandora-kernel.git] / fs / ext4 / xattr_user.c
1 /*
2  * linux/fs/ext4/xattr_user.c
3  * Handler for extended user attributes.
4  *
5  * Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
6  */
7
8 #include <linux/module.h>
9 #include <linux/string.h>
10 #include <linux/fs.h>
11 #include "ext4_jbd2.h"
12 #include "ext4.h"
13 #include "xattr.h"
14
15 static size_t
16 ext4_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
17                      const char *name, size_t name_len, int type)
18 {
19         const size_t prefix_len = XATTR_USER_PREFIX_LEN;
20         const size_t total_len = prefix_len + name_len + 1;
21
22         if (!test_opt(dentry->d_sb, XATTR_USER))
23                 return 0;
24
25         if (list && total_len <= list_size) {
26                 memcpy(list, XATTR_USER_PREFIX, prefix_len);
27                 memcpy(list+prefix_len, name, name_len);
28                 list[prefix_len + name_len] = '\0';
29         }
30         return total_len;
31 }
32
33 static int
34 ext4_xattr_user_get(struct dentry *dentry, const char *name,
35                     void *buffer, size_t size, int type)
36 {
37         if (strcmp(name, "") == 0)
38                 return -EINVAL;
39         if (!test_opt(dentry->d_sb, XATTR_USER))
40                 return -EOPNOTSUPP;
41         return ext4_xattr_get(dentry->d_inode, EXT4_XATTR_INDEX_USER,
42                               name, buffer, size);
43 }
44
45 static int
46 ext4_xattr_user_set(struct dentry *dentry, const char *name,
47                     const void *value, size_t size, int flags, int type)
48 {
49         if (strcmp(name, "") == 0)
50                 return -EINVAL;
51         if (!test_opt(dentry->d_sb, XATTR_USER))
52                 return -EOPNOTSUPP;
53         return ext4_xattr_set(dentry->d_inode, EXT4_XATTR_INDEX_USER,
54                               name, value, size, flags);
55 }
56
57 const struct xattr_handler ext4_xattr_user_handler = {
58         .prefix = XATTR_USER_PREFIX,
59         .list   = ext4_xattr_user_list,
60         .get    = ext4_xattr_user_get,
61         .set    = ext4_xattr_user_set,
62 };