blob: 7a321974d584ad1d3c87c23ec5a8b6644f3b9466 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011#include <linux/ext3_jbd.h>
12#include <linux/ext3_fs.h>
13#include "xattr.h"
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015static size_t
Christoph Hellwig431547b2009-11-13 09:52:56 +000016ext3_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
17 const char *name, size_t name_len, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070018{
Shen Fengef1afd32008-07-25 01:46:23 -070019 const size_t prefix_len = XATTR_USER_PREFIX_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -070020 const size_t total_len = prefix_len + name_len + 1;
21
Christoph Hellwig431547b2009-11-13 09:52:56 +000022 if (!test_opt(dentry->d_sb, XATTR_USER))
Linus Torvalds1da177e2005-04-16 15:20:36 -070023 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
Christoph Hellwig431547b2009-11-13 09:52:56 +000034ext3_xattr_user_get(struct dentry *dentry, const char *name, void *buffer,
35 size_t size, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070036{
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 if (strcmp(name, "") == 0)
38 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000039 if (!test_opt(dentry->d_sb, XATTR_USER))
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 return -EOPNOTSUPP;
Christoph Hellwig431547b2009-11-13 09:52:56 +000041 return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_USER,
42 name, buffer, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043}
44
45static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000046ext3_xattr_user_set(struct dentry *dentry, const char *name,
47 const void *value, size_t size, int flags, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070048{
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 if (strcmp(name, "") == 0)
50 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000051 if (!test_opt(dentry->d_sb, XATTR_USER))
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 return -EOPNOTSUPP;
Christoph Hellwig431547b2009-11-13 09:52:56 +000053 return ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_USER,
54 name, value, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055}
56
Stephen Hemmingerd1f21042010-05-13 17:53:17 -070057const struct xattr_handler ext3_xattr_user_handler = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 .prefix = XATTR_USER_PREFIX,
59 .list = ext3_xattr_user_list,
60 .get = ext3_xattr_user_get,
61 .set = ext3_xattr_user_set,
62};