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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * linux/fs/ext3/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> | |
1da177e4 LT |
11 | #include <linux/ext3_jbd.h> |
12 | #include <linux/ext3_fs.h> | |
13 | #include "xattr.h" | |
14 | ||
15 | #define XATTR_USER_PREFIX "user." | |
16 | ||
17 | static size_t | |
18 | ext3_xattr_user_list(struct inode *inode, char *list, size_t list_size, | |
19 | const char *name, size_t name_len) | |
20 | { | |
21 | const size_t prefix_len = sizeof(XATTR_USER_PREFIX)-1; | |
22 | const size_t total_len = prefix_len + name_len + 1; | |
23 | ||
24 | if (!test_opt(inode->i_sb, XATTR_USER)) | |
25 | return 0; | |
26 | ||
27 | if (list && total_len <= list_size) { | |
28 | memcpy(list, XATTR_USER_PREFIX, prefix_len); | |
29 | memcpy(list+prefix_len, name, name_len); | |
30 | list[prefix_len + name_len] = '\0'; | |
31 | } | |
32 | return total_len; | |
33 | } | |
34 | ||
35 | static int | |
36 | ext3_xattr_user_get(struct inode *inode, const char *name, | |
37 | void *buffer, size_t size) | |
38 | { | |
1da177e4 LT |
39 | if (strcmp(name, "") == 0) |
40 | return -EINVAL; | |
41 | if (!test_opt(inode->i_sb, XATTR_USER)) | |
42 | return -EOPNOTSUPP; | |
1da177e4 LT |
43 | return ext3_xattr_get(inode, EXT3_XATTR_INDEX_USER, name, buffer, size); |
44 | } | |
45 | ||
46 | static int | |
47 | ext3_xattr_user_set(struct inode *inode, const char *name, | |
48 | const void *value, size_t size, int flags) | |
49 | { | |
1da177e4 LT |
50 | if (strcmp(name, "") == 0) |
51 | return -EINVAL; | |
52 | if (!test_opt(inode->i_sb, XATTR_USER)) | |
53 | return -EOPNOTSUPP; | |
1da177e4 LT |
54 | return ext3_xattr_set(inode, EXT3_XATTR_INDEX_USER, name, |
55 | value, size, flags); | |
56 | } | |
57 | ||
58 | struct xattr_handler ext3_xattr_user_handler = { | |
59 | .prefix = XATTR_USER_PREFIX, | |
60 | .list = ext3_xattr_user_list, | |
61 | .get = ext3_xattr_user_get, | |
62 | .set = ext3_xattr_user_set, | |
63 | }; |