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 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 %d; reset to %d", 93 num_servers, 1); 94 num_servers = 1; 95 } 96 if (num_servers > MAXNFSDCNT) { 97 warnx("nfsiod count %d; 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 if (num_servers == 0) 113 exit(0); /* no change */ 114 115 len = sizeof iodmin; 116 error = sysctlbyname("vfs.nfs.iodmin", &iodmin, &len, NULL, 0); 117 if (error < 0) 118 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")"); 119 len = sizeof iodmax; 120 error = sysctlbyname("vfs.nfs.iodmax", &iodmax, &len, NULL, 0); 121 if (error < 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, 127 sizeof iodmin); 128 if (error < 0) 129 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")"); 130 } 131 iodmax = num_servers; 132 error = sysctlbyname("vfs.nfs.iodmax", NULL, 0, &iodmax, sizeof iodmax); 133 if (error < 0) 134 err(1, "sysctlbyname(\"vfs.nfs.iodmax\")"); 135 exit (0); 136 } 137 138