1/*
2 * Copyright (c) 2000-2011 Apple 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#include <string.h>
25#include <sys/mount.h>
26#include <sys/sysctl.h>
27
28#include "sysctl_fsid.h"
29
30int
31sysctl_fsid(int op, fsid_t *fsid, void *oldp, size_t *oldlenp, void *newp,
32    size_t newlen)
33{
34	int ctlname[CTL_MAXNAME+2];
35	size_t ctllen;
36	const char *sysstr = "vfs.generic.ctlbyfsid";
37	struct vfsidctl vc;
38
39	ctllen = CTL_MAXNAME+2;
40	if (sysctlnametomib(sysstr, ctlname, &ctllen) == -1)
41		return (-1);
42	ctlname[ctllen] = op;
43
44	memset(&vc, 0, sizeof(vc));
45	vc.vc_vers = VFS_CTL_VERS1;
46	vc.vc_fsid = *fsid;
47	vc.vc_ptr = newp;
48	vc.vc_len = newlen;
49	return (sysctl(ctlname, (u_int)ctllen + 1, oldp, oldlenp, &vc,
50	    sizeof(vc)));
51}
52