1/*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License, Version 1.0 only
6 * (the "License").  You may not use this file except in compliance
7 * with the License.
8 *
9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10 * or http://www.opensolaris.org/os/licensing.
11 * See the License for the specific language governing permissions
12 * and limitations under the License.
13 *
14 * When distributing Covered Code, include this CDDL HEADER in each
15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16 * If applicable, add the following below this CDDL HEADER, with the
17 * fields enclosed by brackets "[]" replaced with your own identifying
18 * information: Portions Copyright [yyyy] [name of copyright owner]
19 *
20 * CDDL HEADER END
21 */
22/*
23 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
24 * Use is subject to license terms.
25 */
26
27#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29
30/*
31 * miscellaneous utilities
32 */
33
34#include <meta.h>
35#include <zone.h>
36
37static	int	meta_fd = -1;
38static	major_t	meta_major;
39
40/*
41 * open administrative device
42 */
43int
44open_admin(
45	md_error_t	*ep
46)
47{
48	struct stat	buf;
49
50	/* if not already open */
51	if (meta_fd < 0) {
52		ulong_t	dversion = 0;
53
54		/* try read/write fall back to readonly */
55		if ((meta_fd = open(ADMSPECIAL, O_RDWR, 0)) < 0) {
56			if (errno == ENOENT && getzoneid() != GLOBAL_ZONEID)
57				return (mderror(ep, MDE_ZONE_ADMIN, NULL));
58			if (errno != EACCES)
59				return (mdsyserror(ep, errno, ADMSPECIAL));
60			if ((meta_fd = open(ADMSPECIAL, O_RDONLY, 0)) < 0)
61				return (mdsyserror(ep, errno, ADMSPECIAL));
62		}
63
64		/* get major */
65		if (fstat(meta_fd, &buf) != 0)
66			return (mdsyserror(ep, errno, ADMSPECIAL));
67		meta_major = major(buf.st_rdev);
68
69		/* check driver version */
70		if (metaioctl(MD_IOCGVERSION, &dversion, ep, NULL) != 0)
71			return (-1);
72		if (dversion != MD_DVERSION)
73			return (mderror(ep, MDE_DVERSION, NULL));
74	}
75
76	/* return fd */
77	return (meta_fd);
78}
79
80int
81close_admin(
82	md_error_t	*ep
83)
84{
85	if (meta_fd >= 0) {
86		if (close(meta_fd) == -1)
87			return (mdsyserror(ep, errno, ADMSPECIAL));
88		meta_fd = -1;
89	}
90
91	return (0);
92}
93
94/*
95 * Returns True if the md_dev64_t passed in is a metadevice.
96 * Else it returns False.
97 */
98int
99meta_dev_ismeta(
100	md_dev64_t	dev
101)
102{
103	int		fd;
104	md_error_t	status = mdnullerror;
105
106	fd = open_admin(&status);
107	assert(fd >= 0);
108	return (meta_getmajor(dev) == meta_major);
109}
110
111
112int
113meta_get_nunits(md_error_t *ep)
114{
115
116	static set_t		max_nunits = 0;
117
118	if (max_nunits == 0)
119		if (metaioctl(MD_IOCGETNUNITS, &max_nunits, ep, NULL) != 0)
120			return (-1);
121
122	return (max_nunits);
123}
124
125md_dev64_t
126metamakedev(minor_t mnum)
127{
128	int		fd;
129	md_error_t	status = mdnullerror;
130
131	fd = open_admin(&status);
132
133	assert(fd >= 0);
134
135	return (((md_dev64_t)meta_major << NBITSMINOR64) | mnum);
136}
137