1/*
2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17 */
18#include <xfs.h>
19
20/* IRIX interpretation of an uuid_t */
21typedef struct {
22	__be32	uu_timelow;
23	__be16	uu_timemid;
24	__be16	uu_timehi;
25	__be16	uu_clockseq;
26	__be16	uu_node[3];
27} xfs_uu_t;
28
29/*
30 * uuid_getnodeuniq - obtain the node unique fields of a UUID.
31 *
32 * This is not in any way a standard or condoned UUID function;
33 * it just something that's needed for user-level file handles.
34 */
35void
36uuid_getnodeuniq(uuid_t *uuid, int fsid [2])
37{
38	xfs_uu_t *uup = (xfs_uu_t *)uuid;
39
40	fsid[0] = (be16_to_cpu(uup->uu_clockseq) << 16) |
41		   be16_to_cpu(uup->uu_timemid);
42	fsid[1] = be32_to_cpu(uup->uu_timelow);
43}
44
45int
46uuid_is_nil(uuid_t *uuid)
47{
48	int	i;
49	char	*cp = (char *)uuid;
50
51	if (uuid == NULL)
52		return 0;
53	/* implied check of version number here... */
54	for (i = 0; i < sizeof *uuid; i++)
55		if (*cp++) return 0;	/* not nil */
56	return 1;	/* is nil */
57}
58
59int
60uuid_equal(uuid_t *uuid1, uuid_t *uuid2)
61{
62	return memcmp(uuid1, uuid2, sizeof(uuid_t)) ? 0 : 1;
63}
64