1/*
2 * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
3 *
4 * @APPLE_LICENSE_HEADER_START@
5 *
6 * This file contains Original Code and/or Modifications of Original Code
7 * as defined in and that are subject to the Apple Public Source License
8 * Version 2.0 (the 'License'). You may not use this file except in
9 * compliance with the License. Please obtain a copy of the License at
10 * http://www.opensource.apple.com/apsl/ and read it before using this
11 * file.
12 *
13 * The Original Code and all software distributed under the License are
14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
18 * Please see the License for the specific language governing rights and
19 * limitations under the License.
20 *
21 * @APPLE_LICENSE_HEADER_END@
22 */
23/*
24 * Copyright (c) 1995
25 *	The Regents of the University of California.  All rights reserved.
26 *
27 * Redistribution and use in source and binary forms, with or without
28 * modification, are permitted provided that the following conditions
29 * are met:
30 * 1. Redistributions of source code must retain the above copyright
31 *    notice, this list of conditions and the following disclaimer.
32 * 2. Redistributions in binary form must reproduce the above copyright
33 *    notice, this list of conditions and the following disclaimer in the
34 *    documentation and/or other materials provided with the distribution.
35 * 3. All advertising materials mentioning features or use of this software
36 *    must display the following acknowledgement:
37 *	This product includes software developed by the University of
38 *	California, Berkeley and its contributors.
39 * 4. Neither the name of the University nor the names of its contributors
40 *    may be used to endorse or promote products derived from this software
41 *    without specific prior written permission.
42 *
43 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
44 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
47 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
49 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
51 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
52 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * SUCH DAMAGE.
54 */
55
56#include <sys/param.h>
57#include <sys/mount.h>
58#include <sys/sysctl.h>
59#include <errno.h>
60#include <kvm.h>
61#include <string.h>
62
63int getvfsbyname(const char *, struct vfsconf *);
64
65/*
66 * Given a filesystem name, determine if it is resident in the kernel,
67 * and if it is resident, return its vfsconf structure.
68 */
69int
70getvfsbyname(fsname, vfcp)
71	const char *fsname;
72	struct vfsconf *vfcp;
73{
74	int name[4], maxtypenum, cnt;
75	size_t buflen;
76
77	name[0] = CTL_VFS;
78	name[1] = VFS_GENERIC;
79	name[2] = VFS_MAXTYPENUM;
80	buflen = 4;
81	if (sysctl(name, 3, &maxtypenum, &buflen, (void *)0, (size_t)0) < 0)
82		return (-1);
83	name[2] = VFS_CONF;
84	buflen = sizeof *vfcp;
85	for (cnt = 0; cnt < maxtypenum; cnt++) {
86		name[3] = cnt;
87		if (sysctl(name, 4, vfcp, &buflen, (void *)0, (size_t)0) < 0) {
88			if (errno != ENOTSUP)
89				return (-1);
90			continue;
91		}
92		if (!strcmp(fsname, vfcp->vfc_name))
93			return (0);
94	}
95	errno = ENOENT;
96	return (-1);
97}
98