1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #if 0 36 #ifndef lint 37 static const char copyright[] = 38 "@(#) Copyright (c) 1989, 1993\n\ 39 The Regents of the University of California. All rights reserved.\n"; 40 #endif 41 42 #ifndef lint 43 static char sccsid[] = "@(#)nfsiod.c 8.4 (Berkeley) 5/3/95"; 44 #endif 45 #endif 46 #include <sys/cdefs.h> 47 __FBSDID("$FreeBSD$"); 48 49 #include <sys/param.h> 50 #include <sys/syslog.h> 51 #include <sys/wait.h> 52 #include <sys/linker.h> 53 #include <sys/mount.h> 54 #include <sys/sysctl.h> 55 56 #include <err.h> 57 #include <stdio.h> 58 #include <stdlib.h> 59 #include <unistd.h> 60 61 #define MAXNFSDCNT 20 62 63 static void 64 usage(void) 65 { 66 (void)fprintf(stderr, "usage: nfsiod [-n num_servers]\n"); 67 exit(1); 68 } 69 70 int 71 main(int argc, char *argv[]) 72 { 73 int ch; 74 struct xvfsconf vfc; 75 int error; 76 unsigned int iodmin, iodmax, num_servers; 77 size_t len; 78 79 error = getvfsbyname("nfs", &vfc); 80 if (error) { 81 if (kldload("nfs") == -1) 82 err(1, "kldload(nfs)"); 83 error = getvfsbyname("nfs", &vfc); 84 } 85 if (error) 86 errx(1, "NFS support is not available in the running kernel"); 87 88 num_servers = 0; 89 while ((ch = getopt(argc, argv, "n:")) != -1) 90 switch (ch) { 91 case 'n': 92 num_servers = atoi(optarg); 93 if (num_servers < 1) { 94 warnx("nfsiod count %u; reset to %d", 95 num_servers, 1); 96 num_servers = 1; 97 } 98 if (num_servers > MAXNFSDCNT) { 99 warnx("nfsiod count %u; reset to %d", 100 num_servers, MAXNFSDCNT); 101 num_servers = MAXNFSDCNT; 102 } 103 break; 104 case '?': 105 default: 106 usage(); 107 } 108 argc -= optind; 109 argv += optind; 110 111 if (argc > 0) 112 usage(); 113 114 len = sizeof iodmin; 115 error = sysctlbyname("vfs.nfs.iodmin", &iodmin, &len, NULL, 0); 116 if (error < 0) 117 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")"); 118 len = sizeof iodmax; 119 error = sysctlbyname("vfs.nfs.iodmax", &iodmax, &len, NULL, 0); 120 if (error < 0) 121 err(1, "sysctlbyname(\"vfs.nfs.iodmax\")"); 122 if (num_servers == 0) { /* no change */ 123 printf("vfs.nfs.iodmin=%u\nvfs.nfs.iodmax=%u\n", 124 iodmin, iodmax); 125 exit(0); 126 } 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