1/*
2 * Copyright (c) 1995
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if defined(LIBC_SCCS) && !defined(lint)
31static char sccsid[] = "@(#)kvm_getvfsbyname.c	8.1 (Berkeley) 4/3/95";
32#endif /* LIBC_SCCS and not lint */
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD$");
35
36#include <sys/param.h>
37#include <sys/mount.h>
38#include <sys/sysctl.h>
39#include <errno.h>
40#include <stdlib.h>
41#include <string.h>
42
43/*
44 * Given a filesystem name, determine if it is resident in the kernel,
45 * and if it is resident, return its xvfsconf structure.
46 */
47int
48getvfsbyname(fsname, vfcp)
49	const char *fsname;
50	struct xvfsconf *vfcp;
51{
52	struct xvfsconf *xvfsp;
53	size_t buflen;
54	int cnt, i;
55
56	if (sysctlbyname("vfs.conflist", NULL, &buflen, NULL, 0) < 0)
57		return (-1);
58	xvfsp = malloc(buflen);
59	if (xvfsp == NULL)
60		return (-1);
61	if (sysctlbyname("vfs.conflist", xvfsp, &buflen, NULL, 0) < 0) {
62		free(xvfsp);
63		return (-1);
64	}
65	cnt = buflen / sizeof(struct xvfsconf);
66	for (i = 0; i < cnt; i++) {
67		if (strcmp(fsname, xvfsp[i].vfc_name) == 0) {
68			memcpy(vfcp, xvfsp + i, sizeof(struct xvfsconf));
69			free(xvfsp);
70			return (0);
71		}
72	}
73	free(xvfsp);
74	errno = ENOENT;
75	return (-1);
76}
77