blob: 7ed3d8ebf09686d2315e3a1ebdc92ccff5ada1ad [file] [log] [blame]
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>
Mingming Caodab291a2006-10-11 01:21:01 -070011#include <linux/ext4_jbd2.h>
Mingming Cao617ba132006-10-11 01:20:53 -070012#include <linux/ext4_fs.h>
Dave Kleikampac27a0e2006-10-11 01:20:50 -070013#include "xattr.h"
14
15#define XATTR_USER_PREFIX "user."
16
17static size_t
Mingming Cao617ba132006-10-11 01:20:53 -070018ext4_xattr_user_list(struct inode *inode, char *list, size_t list_size,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070019 const char *name, size_t name_len)
20{
21 const size_t prefix_len = sizeof(XATTR_USER_PREFIX)-1;
22 const size_t total_len = prefix_len + name_len + 1;
23
24 if (!test_opt(inode->i_sb, XATTR_USER))
25 return 0;
26
27 if (list && total_len <= list_size) {
28 memcpy(list, XATTR_USER_PREFIX, prefix_len);
29 memcpy(list+prefix_len, name, name_len);
30 list[prefix_len + name_len] = '\0';
31 }
32 return total_len;
33}
34
35static int
Mingming Cao617ba132006-10-11 01:20:53 -070036ext4_xattr_user_get(struct inode *inode, const char *name,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070037 void *buffer, size_t size)
38{
39 if (strcmp(name, "") == 0)
40 return -EINVAL;
41 if (!test_opt(inode->i_sb, XATTR_USER))
42 return -EOPNOTSUPP;
Mingming Cao617ba132006-10-11 01:20:53 -070043 return ext4_xattr_get(inode, EXT4_XATTR_INDEX_USER, name, buffer, size);
Dave Kleikampac27a0e2006-10-11 01:20:50 -070044}
45
46static int
Mingming Cao617ba132006-10-11 01:20:53 -070047ext4_xattr_user_set(struct inode *inode, const char *name,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070048 const void *value, size_t size, int flags)
49{
50 if (strcmp(name, "") == 0)
51 return -EINVAL;
52 if (!test_opt(inode->i_sb, XATTR_USER))
53 return -EOPNOTSUPP;
Mingming Cao617ba132006-10-11 01:20:53 -070054 return ext4_xattr_set(inode, EXT4_XATTR_INDEX_USER, name,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070055 value, size, flags);
56}
57
Mingming Cao617ba132006-10-11 01:20:53 -070058struct xattr_handler ext4_xattr_user_handler = {
Dave Kleikampac27a0e2006-10-11 01:20:50 -070059 .prefix = XATTR_USER_PREFIX,
Mingming Cao617ba132006-10-11 01:20:53 -070060 .list = ext4_xattr_user_list,
61 .get = ext4_xattr_user_get,
62 .set = ext4_xattr_user_set,
Dave Kleikampac27a0e2006-10-11 01:20:50 -070063};