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 (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2006 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 * get root device
31 */
32
33 #include <meta.h>
34 #include "meta_lib_prv.h"
35
36 #include <sys/mnttab.h>
37
38 /*
39 * Return the current root filesystem block device name
40 */
41 void *
meta_get_current_root(md_error_t * ep)42 meta_get_current_root(
43 md_error_t *ep
44 )
45 {
46 FILE *fp;
47 struct mnttab mp;
48
49 if ((fp = open_mnttab()) == NULL) {
50 (void) mdsyserror(ep, errno, MNTTAB);
51 return (NULL);
52 }
53
54 while (getmntent(fp, &mp) == 0) {
55 if (strcmp(mp.mnt_mountp, "/") == 0)
56 return (mp.mnt_special);
57 }
58 (void) mderror(ep, MDE_NOROOT, NULL);
59 return (NULL);
60 }
61
62 /*
63 * Return the current root filesystem block device name. This is only valid
64 * when root is either a slice, a stripe or a mirror.
65 */
66 mdname_t *
meta_get_current_root_dev(mdsetname_t * sp,md_error_t * ep)67 meta_get_current_root_dev(
68 mdsetname_t *sp,
69 md_error_t *ep
70 )
71 {
72 md_stripe_t *stripep;
73 md_mirror_t *mirrorp;
74 md_row_t *rp;
75 md_comp_t *cp;
76 mdname_t *rootnp;
77 void *curroot;
78 char *miscname;
79 int smi;
80
81 if ((curroot = meta_get_current_root(ep)) == NULL)
82 return (NULL);
83 if ((rootnp = metaname(&sp, curroot, UNKNOWN, ep)) == NULL)
84 return (NULL);
85 if (metaismeta(rootnp)) {
86 if ((miscname = metagetmiscname(rootnp, ep)) == NULL)
87 return (NULL);
88 if ((strcmp(miscname, MD_MIRROR) == 0) &&
89 ((mirrorp = meta_get_mirror(sp, rootnp, ep)) != NULL)) {
90 for (smi = 0; smi < NMIRROR; smi++) {
91 md_submirror_t *mdsp =
92 &mirrorp->submirrors[smi];
93 rootnp = mdsp->submirnamep;
94 /* skip unused submirrors */
95 if (rootnp == NULL) {
96 assert(mdsp->state == SMS_UNUSED);
97 continue;
98 }
99 if ((miscname = metagetmiscname(rootnp, ep))
100 == NULL) {
101 (void) mdmderror(ep, MDE_UNKNOWN_TYPE,
102 meta_getminor(rootnp->dev),
103 rootnp->cname);
104 return (NULL);
105 }
106 break;
107 }
108 }
109 if ((strcmp(miscname, MD_STRIPE) == 0) &&
110 ((stripep = meta_get_stripe(sp, rootnp, ep)) != NULL)) {
111 rp = &stripep->rows.rows_val[0];
112 cp = &rp->comps.comps_val[0];
113 if (metachkcomp(cp->compnamep, ep) == 0)
114 return (cp->compnamep);
115 }
116 /* Root is not a single stripe metadevice */
117 (void) mddeverror(ep, MDE_INV_ROOT, rootnp->dev, rootnp->cname);
118 return (NULL);
119 } else return (rootnp);
120 }
121