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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> |
11 | #include <linux/ext3_jbd.h> |
12 | #include <linux/ext3_fs.h> |
13 | #include "xattr.h" |
14 | |
15 | static size_t |
16 | ext3_xattr_user_list(struct inode *inode, char *list, size_t list_size, |
17 | const char *name, size_t name_len) |
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(inode->i_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 | ext3_xattr_user_get(struct inode *inode, const char *name, |
35 | void *buffer, size_t size) |
36 | { |
37 | if (strcmp(name, "") == 0) |
38 | return -EINVAL; |
39 | if (!test_opt(inode->i_sb, XATTR_USER)) |
40 | return -EOPNOTSUPP; |
41 | return ext3_xattr_get(inode, EXT3_XATTR_INDEX_USER, name, buffer, size); |
42 | } |
43 | |
44 | static int |
45 | ext3_xattr_user_set(struct inode *inode, const char *name, |
46 | const void *value, size_t size, int flags) |
47 | { |
48 | if (strcmp(name, "") == 0) |
49 | return -EINVAL; |
50 | if (!test_opt(inode->i_sb, XATTR_USER)) |
51 | return -EOPNOTSUPP; |
52 | return ext3_xattr_set(inode, EXT3_XATTR_INDEX_USER, name, |
53 | value, size, flags); |
54 | } |
55 | |
56 | struct xattr_handler ext3_xattr_user_handler = { |
57 | .prefix = XATTR_USER_PREFIX, |
58 | .list = ext3_xattr_user_list, |
59 | .get = ext3_xattr_user_get, |
60 | .set = ext3_xattr_user_set, |
61 | }; |
62 |
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