1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1989, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Rick Macklem at The University of Guelph.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#if 0
36#ifndef lint
37static const char copyright[] =
38"@(#) Copyright (c) 1989, 1993\n\
39	The Regents of the University of California.  All rights reserved.\n";
40#endif
41
42#ifndef lint
43static char sccsid[] = "@(#)nfsiod.c	8.4 (Berkeley) 5/3/95";
44#endif
45#endif
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD$");
48
49#include <sys/param.h>
50#include <sys/syslog.h>
51#include <sys/wait.h>
52#include <sys/linker.h>
53#include <sys/mount.h>
54#include <sys/sysctl.h>
55
56#include <err.h>
57#include <stdio.h>
58#include <stdlib.h>
59#include <unistd.h>
60
61#define	MAXNFSDCNT      20
62
63static void
64usage(void)
65{
66	(void)fprintf(stderr, "usage: nfsiod [-n num_servers]\n");
67	exit(1);
68}
69
70int
71main(int argc, char *argv[])
72{
73	int ch;
74	struct xvfsconf vfc;
75	int error;
76	unsigned int iodmin, iodmax, num_servers;
77	size_t len;
78
79	error = getvfsbyname("nfs", &vfc);
80	if (error) {
81		if (kldload("nfs") == -1)
82			err(1, "kldload(nfs)");
83		error = getvfsbyname("nfs", &vfc);
84	}
85	if (error)
86		errx(1, "NFS support is not available in the running kernel");
87
88	num_servers = 0;
89	while ((ch = getopt(argc, argv, "n:")) != -1)
90		switch (ch) {
91		case 'n':
92			num_servers = atoi(optarg);
93			if (num_servers < 1) {
94				warnx("nfsiod count %u; reset to %d",
95				    num_servers, 1);
96				num_servers = 1;
97			}
98			if (num_servers > MAXNFSDCNT) {
99				warnx("nfsiod count %u; reset to %d",
100				    num_servers, MAXNFSDCNT);
101				num_servers = MAXNFSDCNT;
102			}
103			break;
104		case '?':
105		default:
106			usage();
107		}
108	argc -= optind;
109	argv += optind;
110
111	if (argc > 0)
112		usage();
113
114	len = sizeof iodmin;
115	error = sysctlbyname("vfs.nfs.iodmin", &iodmin, &len, NULL, 0);
116	if (error < 0)
117		err(1, "sysctlbyname(\"vfs.nfs.iodmin\")");
118	len = sizeof iodmax;
119	error = sysctlbyname("vfs.nfs.iodmax", &iodmax, &len, NULL, 0);
120	if (error < 0)
121		err(1, "sysctlbyname(\"vfs.nfs.iodmax\")");
122	if (num_servers == 0) {		/* no change */
123		printf("vfs.nfs.iodmin=%u\nvfs.nfs.iodmax=%u\n",
124		    iodmin, iodmax);
125		exit(0);
126	}
127	/* Catch the case where we're lowering num_servers below iodmin */
128	if (iodmin > num_servers) {
129		iodmin = num_servers;
130		error = sysctlbyname("vfs.nfs.iodmin", NULL, 0, &iodmin,
131		    sizeof iodmin);
132		if (error < 0)
133			err(1, "sysctlbyname(\"vfs.nfs.iodmin\")");
134	}
135	iodmax = num_servers;
136	error = sysctlbyname("vfs.nfs.iodmax", NULL, 0, &iodmax, sizeof iodmax);
137	if (error < 0)
138		err(1, "sysctlbyname(\"vfs.nfs.iodmax\")");
139	exit (0);
140}
141
142