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 * 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.
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
35 static const char copyright[] =
36 "@(#) Copyright (c) 1989, 1993\n\
37 The Regents of the University of California. All rights reserved.\n";
41 static char sccsid[] = "@(#)nfsiod.c 8.4 (Berkeley) 5/3/95";
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
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 %d; reset to %d",
96 if (num_servers > MAXNFSDCNT) {
97 warnx("nfsiod count %d; reset to %d",
98 num_servers, MAXNFSDCNT);
99 num_servers = MAXNFSDCNT;
112 if (num_servers == 0)
113 exit(0); /* no change */
116 error = sysctlbyname("vfs.nfs.iodmin", &iodmin, &len, NULL, 0);
118 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")");
120 error = sysctlbyname("vfs.nfs.iodmax", &iodmax, &len, NULL, 0);
122 err(1, "sysctlbyname(\"vfs.nfs.iodmax\")");
123 /* Catch the case where we're lowering num_servers below iodmin */
124 if (iodmin > num_servers) {
125 iodmin = num_servers;
126 error = sysctlbyname("vfs.nfs.iodmin", NULL, 0, &iodmin,
129 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")");
131 iodmax = num_servers;
132 error = sysctlbyname("vfs.nfs.iodmax", NULL, 0, &iodmax, sizeof iodmax);
134 err(1, "sysctlbyname(\"vfs.nfs.iodmax\")");