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 2004 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * Checks for a match with the the dump slice.
29 */
30
31 #include <stdlib.h>
32 #include <stdio.h>
33 #include <unistd.h>
34 #include <string.h>
35 #include <synch.h>
36 #include <sys/param.h>
37 #include <sys/types.h>
38 #include <sys/stat.h>
39 #include <fcntl.h>
40 #include <sys/dumpadm.h>
41
42 #include "libdiskmgt.h"
43 #include "disks_private.h"
44
45 /* Cached file descriptor for /dev/dump. */
46 static int dump_fd = -1;
47
48 static mutex_t dump_lock = DEFAULTMUTEX;
49
50 /*
51 * Check the dump device against the input slice.
52 */
53 int
inuse_dump(char * slice,nvlist_t * attrs,int * errp)54 inuse_dump(char *slice, nvlist_t *attrs, int *errp)
55 {
56 int found = 0;
57 int fd;
58 char device[MAXPATHLEN];
59
60 *errp = 0;
61 if (slice == NULL) {
62 return (found);
63 }
64
65 /*
66 * We only want to open /dev/dump once instead of for every
67 * slice so we cache the open file descriptor. The ioctl
68 * is cheap so we can do that for every slice.
69 */
70 (void) mutex_lock(&dump_lock);
71
72 if (dump_fd == -1) {
73 if ((dump_fd = open("/dev/dump", O_RDONLY)) >= 0)
74 (void) fcntl(dump_fd, F_SETFD, FD_CLOEXEC);
75 }
76
77 fd = dump_fd;
78
79 (void) mutex_unlock(&dump_lock);
80
81 if (fd != -1) {
82 if (ioctl(fd, DIOCGETDEV, device) != -1) {
83 if (strcmp(slice, device) == 0) {
84 libdiskmgt_add_str(attrs, DM_USED_BY,
85 DM_USE_DUMP, errp);
86 libdiskmgt_add_str(attrs, DM_USED_NAME,
87 DM_USE_DUMP, errp);
88 found = 1;
89 }
90 }
91 }
92
93 return (found);
94 }
95