Root/fs/ext3/xattr_user.c

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
15static size_t
16ext3_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
33static int
34ext3_xattr_user_get(struct dentry *dentry, const char *name, void *buffer,
35        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 ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_USER,
42                  name, buffer, size);
43}
44
45static int
46ext3_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 ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_USER,
54                  name, value, size, flags);
55}
56
57const struct xattr_handler ext3_xattr_user_handler = {
58    .prefix = XATTR_USER_PREFIX,
59    .list = ext3_xattr_user_list,
60    .get = ext3_xattr_user_get,
61    .set = ext3_xattr_user_set,
62};
63

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