2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 static const char copyright[] =
39 "@(#) Copyright (c) 1989, 1993\n\
40 The Regents of the University of California. All rights reserved.\n";
45 static char sccsid[] = "@(#)nfsiod.c 8.4 (Berkeley) 5/3/95";
47 static const char rcsid[] =
51 #include <sys/param.h>
52 #include <sys/syslog.h>
54 #include <sys/linker.h>
55 #include <sys/mount.h>
56 #include <sys/sysctl.h>
68 (void)fprintf(stderr, "usage: nfsiod [-n num_servers]\n");
73 main(int argc, char *argv[])
78 unsigned int iodmin, iodmax, num_servers;
81 error = getvfsbyname("nfs", &vfc);
83 if (kldload("nfs") == -1)
84 err(1, "kldload(nfs)");
85 error = getvfsbyname("nfs", &vfc);
88 errx(1, "NFS support is not available in the running kernel");
91 while ((ch = getopt(argc, argv, "n:")) != -1)
94 num_servers = atoi(optarg);
95 if (num_servers < 1) {
96 warnx("nfsiod count %d; reset to %d",
100 if (num_servers > MAXNFSDCNT) {
101 warnx("nfsiod count %d; reset to %d",
102 num_servers, MAXNFSDCNT);
103 num_servers = MAXNFSDCNT;
116 if (num_servers == 0)
117 exit(0); /* no change */
120 error = sysctlbyname("vfs.nfs.iodmin", &iodmin, &len, NULL, 0);
122 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")");
124 error = sysctlbyname("vfs.nfs.iodmax", &iodmax, &len, NULL, 0);
126 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")");
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,
133 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")");
135 iodmax = num_servers;
136 error = sysctlbyname("vfs.nfs.iodmax", NULL, 0, &iodmax, sizeof iodmax);
138 err(1, "sysctlbyname(\"vfs.nfs.iodmax\")");