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#pragma ident	"%Z%%M%	%I%	%E% SMI"
28
29/*
30 * Checks for a match with the the dump slice.
31 */
32
33#include <stdlib.h>
34#include <stdio.h>
35#include <unistd.h>
36#include <string.h>
37#include <synch.h>
38#include <sys/param.h>
39#include <sys/types.h>
40#include <sys/stat.h>
41#include <fcntl.h>
42#include <sys/dumpadm.h>
43
44#include "libdiskmgt.h"
45#include "disks_private.h"
46
47/* Cached file descriptor for /dev/dump. */
48static int		dump_fd = -1;
49
50static mutex_t		dump_lock = DEFAULTMUTEX;
51
52/*
53 * Check the dump device against the input slice.
54 */
55int
56inuse_dump(char *slice, nvlist_t *attrs, int *errp)
57{
58	int		found = 0;
59	int		fd;
60	char		device[MAXPATHLEN];
61
62	*errp = 0;
63	if (slice == NULL) {
64	    return (found);
65	}
66
67	/*
68	 * We only want to open /dev/dump once instead of for every
69	 * slice so we cache the open file descriptor.  The ioctl
70	 * is cheap so we can do that for every slice.
71	 */
72	(void) mutex_lock(&dump_lock);
73
74	if (dump_fd == -1) {
75		if ((dump_fd = open("/dev/dump", O_RDONLY)) >= 0)
76			(void) fcntl(dump_fd, F_SETFD, FD_CLOEXEC);
77	}
78
79	fd = dump_fd;
80
81	(void) mutex_unlock(&dump_lock);
82
83	if (fd != -1) {
84		if (ioctl(fd, DIOCGETDEV, device) != -1) {
85			if (strcmp(slice, device) == 0) {
86				libdiskmgt_add_str(attrs, DM_USED_BY,
87				    DM_USE_DUMP, errp);
88				libdiskmgt_add_str(attrs, DM_USED_NAME,
89				    DM_USE_DUMP, errp);
90				found = 1;
91			}
92		}
93	}
94
95	return (found);
96}
97