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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
Dave Kleikampac27a0e2006-10-11 01:20:50 -07008#include <linux/string.h>
9#include <linux/fs.h>
Christoph Hellwig3dcf5452008-04-29 18:13:32 -040010#include "ext4_jbd2.h"
11#include "ext4.h"
Dave Kleikampac27a0e2006-10-11 01:20:50 -070012#include "xattr.h"
13
Dave Kleikampac27a0e2006-10-11 01:20:50 -070014static size_t
Christoph Hellwig431547b2009-11-13 09:52:56 +000015ext4_xattr_user_list(struct dentry *dentry, char *list, size_t list_size,
16 const char *name, size_t name_len, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070017{
Shen Feng35375762008-07-11 19:27:31 -040018 const size_t prefix_len = XATTR_USER_PREFIX_LEN;
Dave Kleikampac27a0e2006-10-11 01:20:50 -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))
Dave Kleikampac27a0e2006-10-11 01:20:50 -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 +000033ext4_xattr_user_get(struct dentry *dentry, const char *name,
34 void *buffer, size_t size, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070035{
36 if (strcmp(name, "") == 0)
37 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000038 if (!test_opt(dentry->d_sb, XATTR_USER))
Dave Kleikampac27a0e2006-10-11 01:20:50 -070039 return -EOPNOTSUPP;
Christoph Hellwig431547b2009-11-13 09:52:56 +000040 return ext4_xattr_get(dentry->d_inode, EXT4_XATTR_INDEX_USER,
41 name, buffer, size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070042}
43
44static int
Christoph Hellwig431547b2009-11-13 09:52:56 +000045ext4_xattr_user_set(struct dentry *dentry, const char *name,
46 const void *value, size_t size, int flags, int type)
Dave Kleikampac27a0e2006-10-11 01:20:50 -070047{
48 if (strcmp(name, "") == 0)
49 return -EINVAL;
Christoph Hellwig431547b2009-11-13 09:52:56 +000050 if (!test_opt(dentry->d_sb, XATTR_USER))
Dave Kleikampac27a0e2006-10-11 01:20:50 -070051 return -EOPNOTSUPP;
Christoph Hellwig431547b2009-11-13 09:52:56 +000052 return ext4_xattr_set(dentry->d_inode, EXT4_XATTR_INDEX_USER,
53 name, value, size, flags);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070054}
55
Stephen Hemminger11e27522010-05-13 17:53:18 -070056const struct xattr_handler ext4_xattr_user_handler = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -070057 .prefix = XATTR_USER_PREFIX,
Mingming Cao617ba132006-10-11 01:20:53 -070058 .list = ext4_xattr_user_list,
59 .get = ext4_xattr_user_get,
60 .set = ext4_xattr_user_set,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070061};