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 #endif 43 #include <sys/cdefs.h> 44 #include <sys/param.h> 45 #include <sys/syslog.h> 46 #include <sys/wait.h> 47 #include <sys/linker.h> 48 #include <sys/mount.h> 49 #include <sys/sysctl.h> 50 51 #include <err.h> 52 #include <stdio.h> 53 #include <stdlib.h> 54 #include <unistd.h> 55 56 #define MAXNFSDCNT 20 57 58 static void 59 usage(void) 60 { 61 (void)fprintf(stderr, "usage: nfsiod [-n num_servers]\n"); 62 exit(1); 63 } 64 65 int 66 main(int argc, char *argv[]) 67 { 68 int ch; 69 struct xvfsconf vfc; 70 int error; 71 unsigned int iodmin, iodmax, num_servers; 72 size_t len; 73 74 error = getvfsbyname("nfs", &vfc); 75 if (error) { 76 if (kldload("nfs") == -1) 77 err(1, "kldload(nfs)"); 78 error = getvfsbyname("nfs", &vfc); 79 } 80 if (error) 81 errx(1, "NFS support is not available in the running kernel"); 82 83 num_servers = 0; 84 while ((ch = getopt(argc, argv, "n:")) != -1) 85 switch (ch) { 86 case 'n': 87 num_servers = atoi(optarg); 88 if (num_servers < 1) { 89 warnx("nfsiod count %u; reset to %d", 90 num_servers, 1); 91 num_servers = 1; 92 } 93 if (num_servers > MAXNFSDCNT) { 94 warnx("nfsiod count %u; reset to %d", 95 num_servers, MAXNFSDCNT); 96 num_servers = MAXNFSDCNT; 97 } 98 break; 99 case '?': 100 default: 101 usage(); 102 } 103 argc -= optind; 104 argv += optind; 105 106 if (argc > 0) 107 usage(); 108 109 len = sizeof iodmin; 110 error = sysctlbyname("vfs.nfs.iodmin", &iodmin, &len, NULL, 0); 111 if (error < 0) 112 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")"); 113 len = sizeof iodmax; 114 error = sysctlbyname("vfs.nfs.iodmax", &iodmax, &len, NULL, 0); 115 if (error < 0) 116 err(1, "sysctlbyname(\"vfs.nfs.iodmax\")"); 117 if (num_servers == 0) { /* no change */ 118 printf("vfs.nfs.iodmin=%u\nvfs.nfs.iodmax=%u\n", 119 iodmin, iodmax); 120 exit(0); 121 } 122 /* Catch the case where we're lowering num_servers below iodmin */ 123 if (iodmin > num_servers) { 124 iodmin = num_servers; 125 error = sysctlbyname("vfs.nfs.iodmin", NULL, 0, &iodmin, 126 sizeof iodmin); 127 if (error < 0) 128 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")"); 129 } 130 iodmax = num_servers; 131 error = sysctlbyname("vfs.nfs.iodmax", NULL, 0, &iodmax, sizeof iodmax); 132 if (error < 0) 133 err(1, "sysctlbyname(\"vfs.nfs.iodmax\")"); 134 exit (0); 135 } 136 137