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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/ext2/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/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/string.h>
10#include "ext2.h"
11#include "xattr.h"
12
Linus Torvalds1da177e2005-04-16 15:20:36 -070013static size_t
Christoph Hellwig431547b2009-11-13 09:52:56 +000014ext2_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
15 const char *name, size_t name_len, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070016{
Shen Fengf905f062008-07-25 01:46:15 -070017 const size_t prefix_len = XATTR_USER_PREFIX_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 const size_t total_len = prefix_len + name_len + 1;
19
Christoph Hellwig431547b2009-11-13 09:52:56 +000020 if (!test_opt(dentry->d_sb, XATTR_USER))
Linus Torvalds1da177e2005-04-16 15:20:36 -070021 return 0;
22
23 if (list && total_len <= list_size) {
24 memcpy(list, XATTR_USER_PREFIX, prefix_len);
25 memcpy(list+prefix_len, name, name_len);
26 list[prefix_len + name_len] = '\0';
27 }
28 return total_len;
29}
30
31static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000032ext2_xattr_user_get(struct dentry *dentry, const char *name,
33 void *buffer, size_t size, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070034{
Linus Torvalds1da177e2005-04-16 15:20:36 -070035 if (strcmp(name, "") == 0)
36 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000037 if (!test_opt(dentry->d_sb, XATTR_USER))
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 return -EOPNOTSUPP;
Christoph Hellwig431547b2009-11-13 09:52:56 +000039 return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_USER,
40 name, buffer, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041}
42
43static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000044ext2_xattr_user_set(struct dentry *dentry, const char *name,
45 const void *value, size_t size, int flags, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046{
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 if (strcmp(name, "") == 0)
48 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000049 if (!test_opt(dentry->d_sb, XATTR_USER))
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Christoph Hellwig431547b2009-11-13 09:52:56 +000052 return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_USER,
53 name, value, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054}
55
Stephen Hemminger749c72ef2010-05-13 17:53:16 -070056const struct xattr_handler ext2_xattr_user_handler = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 .prefix = XATTR_USER_PREFIX,
58 .list = ext2_xattr_user_list,
59 .get = ext2_xattr_user_get,
60 .set = ext2_xattr_user_set,
61};