1/*
2 * Copyright (c) 1989, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if 0
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1989, 1993\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif
39
40#ifndef lint
41static char sccsid[] = "@(#)nfsiod.c	8.4 (Berkeley) 5/3/95";
42#endif
43#endif
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD$");
46
47#include <sys/param.h>
48#include <sys/syslog.h>
49#include <sys/wait.h>
50#include <sys/linker.h>
51#include <sys/mount.h>
52#include <sys/sysctl.h>
53
54#include <err.h>
55#include <stdio.h>
56#include <stdlib.h>
57#include <unistd.h>
58
59#define	MAXNFSDCNT      20
60
61static void
62usage(void)
63{
64	(void)fprintf(stderr, "usage: nfsiod [-n num_servers]\n");
65	exit(1);
66}
67
68int
69main(int argc, char *argv[])
70{
71	int ch;
72	struct xvfsconf vfc;
73	int error;
74	unsigned int iodmin, iodmax, num_servers;
75	size_t len;
76
77	error = getvfsbyname("nfs", &vfc);
78	if (error) {
79		if (kldload("nfs") == -1)
80			err(1, "kldload(nfs)");
81		error = getvfsbyname("nfs", &vfc);
82	}
83	if (error)
84		errx(1, "NFS support is not available in the running kernel");
85
86	num_servers = 0;
87	while ((ch = getopt(argc, argv, "n:")) != -1)
88		switch (ch) {
89		case 'n':
90			num_servers = atoi(optarg);
91			if (num_servers < 1) {
92				warnx("nfsiod count %u; reset to %d",
93				    num_servers, 1);
94				num_servers = 1;
95			}
96			if (num_servers > MAXNFSDCNT) {
97				warnx("nfsiod count %u; reset to %d",
98				    num_servers, MAXNFSDCNT);
99				num_servers = MAXNFSDCNT;
100			}
101			break;
102		case '?':
103		default:
104			usage();
105		}
106	argc -= optind;
107	argv += optind;
108
109	if (argc > 0)
110		usage();
111
112	len = sizeof iodmin;
113	error = sysctlbyname("vfs.nfs.iodmin", &iodmin, &len, NULL, 0);
114	if (error < 0)
115		err(1, "sysctlbyname(\"vfs.nfs.iodmin\")");
116	len = sizeof iodmax;
117	error = sysctlbyname("vfs.nfs.iodmax", &iodmax, &len, NULL, 0);
118	if (error < 0)
119		err(1, "sysctlbyname(\"vfs.nfs.iodmax\")");
120	if (num_servers == 0) {		/* no change */
121		printf("vfs.nfs.iodmin=%u\nvfs.nfs.iodmax=%u\n",
122		    iodmin, iodmax);
123		exit(0);
124	}
125	/* Catch the case where we're lowering num_servers below iodmin */
126	if (iodmin > num_servers) {
127		iodmin = num_servers;
128		error = sysctlbyname("vfs.nfs.iodmin", NULL, 0, &iodmin,
129		    sizeof iodmin);
130		if (error < 0)
131			err(1, "sysctlbyname(\"vfs.nfs.iodmin\")");
132	}
133	iodmax = num_servers;
134	error = sysctlbyname("vfs.nfs.iodmax", NULL, 0, &iodmax, sizeof iodmax);
135	if (error < 0)
136		err(1, "sysctlbyname(\"vfs.nfs.iodmax\")");
137	exit (0);
138}
139
140