2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1989, 1993
5 * The Regents of the University of California. All rights reserved.
7 * This code is derived from software contributed to Berkeley by
8 * Rick Macklem at The University of Guelph.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
37 static const char copyright[] =
38 "@(#) Copyright (c) 1989, 1993\n\
39 The Regents of the University of California. All rights reserved.\n";
43 static char sccsid[] = "@(#)nfsiod.c 8.4 (Berkeley) 5/3/95";
46 #include <sys/cdefs.h>
47 #include <sys/param.h>
48 #include <sys/syslog.h>
50 #include <sys/linker.h>
51 #include <sys/mount.h>
52 #include <sys/sysctl.h>
64 (void)fprintf(stderr, "usage: nfsiod [-n num_servers]\n");
69 main(int argc, char *argv[])
74 unsigned int iodmin, iodmax, num_servers;
77 error = getvfsbyname("nfs", &vfc);
79 if (kldload("nfs") == -1)
80 err(1, "kldload(nfs)");
81 error = getvfsbyname("nfs", &vfc);
84 errx(1, "NFS support is not available in the running kernel");
87 while ((ch = getopt(argc, argv, "n:")) != -1)
90 num_servers = atoi(optarg);
91 if (num_servers < 1) {
92 warnx("nfsiod count %u; reset to %d",
96 if (num_servers > MAXNFSDCNT) {
97 warnx("nfsiod count %u; reset to %d",
98 num_servers, MAXNFSDCNT);
99 num_servers = MAXNFSDCNT;
113 error = sysctlbyname("vfs.nfs.iodmin", &iodmin, &len, NULL, 0);
115 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")");
117 error = sysctlbyname("vfs.nfs.iodmax", &iodmax, &len, NULL, 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",
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,
131 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")");
133 iodmax = num_servers;
134 error = sysctlbyname("vfs.nfs.iodmax", NULL, 0, &iodmax, sizeof iodmax);
136 err(1, "sysctlbyname(\"vfs.nfs.iodmax\")");