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. 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. 23 * 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 34 * SUCH DAMAGE. 35 */ 36 37 #ifndef lint 38 static const char copyright[] = 39 "@(#) Copyright (c) 1989, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif 42 43 #ifndef lint 44 #if 0 45 static char sccsid[] = "@(#)nfsiod.c 8.4 (Berkeley) 5/3/95"; 46 #endif 47 static const char rcsid[] = 48 "$FreeBSD$"; 49 #endif 50 51 #include <sys/param.h> 52 #include <sys/syslog.h> 53 #include <sys/wait.h> 54 #include <sys/linker.h> 55 #include <sys/mount.h> 56 #include <sys/sysctl.h> 57 58 #include <err.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <unistd.h> 62 63 #define MAXNFSDCNT 20 64 65 static void 66 usage(void) 67 { 68 (void)fprintf(stderr, "usage: nfsiod [-n num_servers]\n"); 69 exit(1); 70 } 71 72 int 73 main(int argc, char *argv[]) 74 { 75 int ch; 76 struct xvfsconf vfc; 77 int error; 78 unsigned int iodmin, iodmax, num_servers; 79 size_t len; 80 81 error = getvfsbyname("nfs", &vfc); 82 if (error) { 83 if (kldload("nfs") == -1) 84 err(1, "kldload(nfs)"); 85 error = getvfsbyname("nfs", &vfc); 86 } 87 if (error) 88 errx(1, "NFS support is not available in the running kernel"); 89 90 num_servers = 0; 91 while ((ch = getopt(argc, argv, "n:")) != -1) 92 switch (ch) { 93 case 'n': 94 num_servers = atoi(optarg); 95 if (num_servers < 1) { 96 warnx("nfsiod count %d; reset to %d", 97 num_servers, 1); 98 num_servers = 1; 99 } 100 if (num_servers > MAXNFSDCNT) { 101 warnx("nfsiod count %d; reset to %d", 102 num_servers, MAXNFSDCNT); 103 num_servers = MAXNFSDCNT; 104 } 105 break; 106 case '?': 107 default: 108 usage(); 109 } 110 argc -= optind; 111 argv += optind; 112 113 if (argc > 0) 114 usage(); 115 116 if (num_servers == 0) 117 exit(0); /* no change */ 118 119 len = sizeof iodmin; 120 error = sysctlbyname("vfs.nfs.iodmin", &iodmin, &len, NULL, 0); 121 if (error < 0) 122 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")"); 123 len = sizeof iodmax; 124 error = sysctlbyname("vfs.nfs.iodmax", &iodmax, &len, NULL, 0); 125 if (error < 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, 131 sizeof iodmin); 132 if (error < 0) 133 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")"); 134 } 135 iodmax = num_servers; 136 error = sysctlbyname("vfs.nfs.iodmax", NULL, 0, &iodmax, sizeof iodmax); 137 if (error < 0) 138 err(1, "sysctlbyname(\"vfs.nfs.iodmax\")"); 139 exit (0); 140 } 141 142