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Dave Kleikampac27a0e2006-10-11 01:20:50 -07001/*
Mingming Cao617ba132006-10-11 01:20:53 -07002 * linux/fs/ext4/xattr_user.c
Dave Kleikampac27a0e2006-10-11 01:20:50 -07003 * 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>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040011#include "ext4_jbd2.h"
12#include "ext4.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070013#include "xattr.h"
14
Dave Kleikampac27a0e2006-10-11 01:20:50 -070015static size_t
Christoph Hellwig431547b2009-11-13 09:52:56 +000016ext4_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
17 const char *name, size_t name_len, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070018{
Shen Feng35375762008-07-11 19:27:31 -040019 const size_t prefix_len = XATTR_USER_PREFIX_LEN;
Dave Kleikampac27a0e2006-10-11 01:20:50 -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))
Dave Kleikampac27a0e2006-10-11 01:20:50 -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 +000034ext4_xattr_user_get(struct dentry *dentry, const char *name,
35 void *buffer, size_t size, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070036{
37 if (strcmp(name, "") == 0)
38 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000039 if (!test_opt(dentry->d_sb, XATTR_USER))
Dave Kleikampac27a0e2006-10-11 01:20:50 -070040 return -EOPNOTSUPP;
Christoph Hellwig431547b2009-11-13 09:52:56 +000041 return ext4_xattr_get(dentry->d_inode, EXT4_XATTR_INDEX_USER,
42 name, buffer, size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070043}
44
45static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000046ext4_xattr_user_set(struct dentry *dentry, const char *name,
47 const void *value, size_t size, int flags, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070048{
49 if (strcmp(name, "") == 0)
50 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000051 if (!test_opt(dentry->d_sb, XATTR_USER))
Dave Kleikampac27a0e2006-10-11 01:20:50 -070052 return -EOPNOTSUPP;
Christoph Hellwig431547b2009-11-13 09:52:56 +000053 return ext4_xattr_set(dentry->d_inode, EXT4_XATTR_INDEX_USER,
54 name, value, size, flags);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070055}
56
Mingming Cao617ba132006-10-11 01:20:53 -070057struct xattr_handler ext4_xattr_user_handler = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -070058 .prefix = XATTR_USER_PREFIX,
Mingming Cao617ba132006-10-11 01:20:53 -070059 .list = ext4_xattr_user_list,
60 .get = ext4_xattr_user_get,
61 .set = ext4_xattr_user_set,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070062};