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
35 static 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
41 static 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
61 static void
usage(void)62 usage(void)
63 {
64 (void)fprintf(stderr, "usage: nfsiod [-n num_servers]\n");
65 exit(1);
66 }
67
68 int
main(int argc,char * argv[])69 main(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