blob: 3f6caf3684b47ebc42c1dfd310067eb07d18b8c0 [file] [log] [blame]
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>
9#include <linux/module.h>
10#include <linux/string.h>
11#include "ext2.h"
12#include "xattr.h"
13
Linus Torvalds1da177e2005-04-16 15:20:36 -070014static size_t
Christoph Hellwig431547b2009-11-13 09:52:56 +000015ext2_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
16 const char *name, size_t name_len, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070017{
Shen Fengf905f062008-07-25 01:46:15 -070018 const size_t prefix_len = XATTR_USER_PREFIX_LEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 const size_t total_len = prefix_len + name_len + 1;
20
Christoph Hellwig431547b2009-11-13 09:52:56 +000021 if (!test_opt(dentry->d_sb, XATTR_USER))
Linus Torvalds1da177e2005-04-16 15:20:36 -070022 return 0;
23
24 if (list && total_len <= list_size) {
25 memcpy(list, XATTR_USER_PREFIX, prefix_len);
26 memcpy(list+prefix_len, name, name_len);
27 list[prefix_len + name_len] = '\0';
28 }
29 return total_len;
30}
31
32static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000033ext2_xattr_user_get(struct dentry *dentry, const char *name,
34 void *buffer, size_t size, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070035{
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 if (strcmp(name, "") == 0)
37 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000038 if (!test_opt(dentry->d_sb, XATTR_USER))
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 return -EOPNOTSUPP;
Christoph Hellwig431547b2009-11-13 09:52:56 +000040 return ext2_xattr_get(dentry->d_inode, EXT2_XATTR_INDEX_USER,
41 name, buffer, size);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042}
43
44static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000045ext2_xattr_user_set(struct dentry *dentry, const char *name,
46 const void *value, size_t size, int flags, int type)
Linus Torvalds1da177e2005-04-16 15:20:36 -070047{
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 if (strcmp(name, "") == 0)
49 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000050 if (!test_opt(dentry->d_sb, XATTR_USER))
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 return -EOPNOTSUPP;
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
Christoph Hellwig431547b2009-11-13 09:52:56 +000053 return ext2_xattr_set(dentry->d_inode, EXT2_XATTR_INDEX_USER,
54 name, value, size, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055}
56
57struct xattr_handler ext2_xattr_user_handler = {
58 .prefix = XATTR_USER_PREFIX,
59 .list = ext2_xattr_user_list,
60 .get = ext2_xattr_user_get,
61 .set = ext2_xattr_user_set,
62};