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
37 static int meta_fd = -1;
38 static major_t meta_major;
39
40 /*
41 * open administrative device
42 */
43 int
open_admin(md_error_t * ep)44 open_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
80 int
close_admin(md_error_t * ep)81 close_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 */
98 int
meta_dev_ismeta(md_dev64_t dev)99 meta_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
112 int
meta_get_nunits(md_error_t * ep)113 meta_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
125 md_dev64_t
metamakedev(minor_t mnum)126 metamakedev(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