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 #include <sys/param.h> 36 #include <sys/syslog.h> 37 #include <sys/wait.h> 38 #include <sys/linker.h> 39 #include <sys/mount.h> 40 #include <sys/sysctl.h> 41 42 #include <err.h> 43 #include <stdio.h> 44 #include <stdlib.h> 45 #include <unistd.h> 46 47 #define MAXNFSDCNT 20 48 49 static void 50 usage(void) 51 { 52 (void)fprintf(stderr, "usage: nfsiod [-n num_servers]\n"); 53 exit(1); 54 } 55 56 int 57 main(int argc, char *argv[]) 58 { 59 int ch; 60 struct xvfsconf vfc; 61 int error; 62 unsigned int iodmin, iodmax, num_servers; 63 size_t len; 64 65 error = getvfsbyname("nfs", &vfc); 66 if (error) { 67 if (kldload("nfs") == -1) 68 err(1, "kldload(nfs)"); 69 error = getvfsbyname("nfs", &vfc); 70 } 71 if (error) 72 errx(1, "NFS support is not available in the running kernel"); 73 74 num_servers = 0; 75 while ((ch = getopt(argc, argv, "n:")) != -1) 76 switch (ch) { 77 case 'n': 78 num_servers = atoi(optarg); 79 if (num_servers < 1) { 80 warnx("nfsiod count %u; reset to %d", 81 num_servers, 1); 82 num_servers = 1; 83 } 84 if (num_servers > MAXNFSDCNT) { 85 warnx("nfsiod count %u; reset to %d", 86 num_servers, MAXNFSDCNT); 87 num_servers = MAXNFSDCNT; 88 } 89 break; 90 case '?': 91 default: 92 usage(); 93 } 94 argc -= optind; 95 argv += optind; 96 97 if (argc > 0) 98 usage(); 99 100 len = sizeof iodmin; 101 error = sysctlbyname("vfs.nfs.iodmin", &iodmin, &len, NULL, 0); 102 if (error < 0) 103 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")"); 104 len = sizeof iodmax; 105 error = sysctlbyname("vfs.nfs.iodmax", &iodmax, &len, NULL, 0); 106 if (error < 0) 107 err(1, "sysctlbyname(\"vfs.nfs.iodmax\")"); 108 if (num_servers == 0) { /* no change */ 109 printf("vfs.nfs.iodmin=%u\nvfs.nfs.iodmax=%u\n", 110 iodmin, iodmax); 111 exit(0); 112 } 113 /* Catch the case where we're lowering num_servers below iodmin */ 114 if (iodmin > num_servers) { 115 iodmin = num_servers; 116 error = sysctlbyname("vfs.nfs.iodmin", NULL, 0, &iodmin, 117 sizeof iodmin); 118 if (error < 0) 119 err(1, "sysctlbyname(\"vfs.nfs.iodmin\")"); 120 } 121 iodmax = num_servers; 122 error = sysctlbyname("vfs.nfs.iodmax", NULL, 0, &iodmax, sizeof iodmax); 123 if (error < 0) 124 err(1, "sysctlbyname(\"vfs.nfs.iodmax\")"); 125 exit (0); 126 } 127 128