xref: /freebsd/sbin/nfsiod/nfsiod.c (revision af6a5351a1fdb1130f18be6c782c4d48916eb971)
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  * 3. 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
62 usage(void)
63 {
64 	(void)fprintf(stderr, "usage: nfsiod [-n num_servers]\n");
65 	exit(1);
66 }
67 
68 int
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