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 not lint 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 not lint 50 51 #include <sys/param.h> 52 #include <sys/syslog.h> 53 #include <sys/wait.h> 54 #include <sys/mount.h> 55 #include <sys/time.h> 56 57 #include <err.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <unistd.h> 61 62 #define MAXNFSDCNT 20 63 64 static void 65 usage(void) 66 { 67 (void)fprintf(stderr, "usage: nfsiod [-n num_servers]\n"); 68 exit(1); 69 } 70 71 int 72 main(int argc, char *argv[]) 73 { 74 int ch, num_servers; 75 struct vfsconf vfc; 76 int error; 77 unsigned int iodmin; 78 unsigned int iodmax; 79 size_t len; 80 81 error = getvfsbyname("nfs", &vfc); 82 if (error && vfsisloadable("nfs")) { 83 if (vfsload("nfs")) 84 err(1, "vfsload(nfs)"); 85 endvfsent(); /* flush cache */ 86 error = getvfsbyname("nfs", &vfc); 87 } 88 if (error) 89 errx(1, "NFS support is not available in the running kernel"); 90 91 num_servers = 0; 92 while ((ch = getopt(argc, argv, "n:")) != -1) 93 switch (ch) { 94 case 'n': 95 num_servers = atoi(optarg); 96 if (num_servers < 1) { 97 warnx("nfsiod count %d; reset to %d", 98 num_servers, 1); 99 num_servers = 1; 100 } 101 if (num_servers > MAXNFSDCNT) { 102 warnx("nfsiod count %d; reset to %d", 103 num_servers, MAXNFSDCNT); 104 num_servers = MAXNFSDCNT; 105 } 106 break; 107 case '?': 108 default: 109 usage(); 110 } 111 argc -= optind; 112 argv += optind; 113 114 if (argc > 0) 115 usage(); 116 117 if (num_servers == 0) 118 exit(0); /* no change */ 119 120 len = sizeof iodmin; 121 error = sysctlbyname("vfs.nfs.iodmin", &iodmin, &len, NULL, 0); 122 if (error < 0) 123 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")"); 124 len = sizeof iodmax; 125 error = sysctlbyname("vfs.nfs.iodmax", &iodmax, &len, NULL, 0); 126 if (error < 0) 127 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")"); 128 /* Catch the case where we're lowering num_servers below iodmin */ 129 if (iodmin > num_servers) { 130 iodmin = num_servers; 131 error = sysctlbyname("vfs.nfs.iodmin", NULL, 0, &iodmin, 132 sizeof iodmin); 133 if (error < 0) 134 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")"); 135 } 136 iodmax = num_servers; 137 error = sysctlbyname("vfs.nfs.iodmax", NULL, 0, &iodmax, sizeof iodmax); 138 if (error < 0) 139 err(1, "sysctlbyname(\"vfs.nfs.iodmax\")"); 140 } 141 142