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. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * @(#) Copyright (c) 1989, 1993 The Regents of the University of California. All rights reserved. 33 * @(#)nfsiod.c 8.4 (Berkeley) 5/3/95 34 * $FreeBSD: src/sbin/nfsiod/nfsiod.c,v 1.9 1999/08/28 00:13:55 peter Exp $ 35 */ 36 37 #include <sys/param.h> 38 #include <sys/syslog.h> 39 #include <sys/wait.h> 40 #include <sys/mount.h> 41 42 #include <vfs/nfs/rpcv2.h> 43 #include <vfs/nfs/nfs.h> 44 45 #include <err.h> 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <unistd.h> 49 50 /* Global defs */ 51 #ifdef DEBUG 52 int debug = 1; 53 #else 54 int debug = 0; 55 #endif 56 57 static void nonfs(int); 58 static void reapchild(int); 59 static void usage(void); 60 61 /* 62 * Nfsiod does asynchronous buffered I/O on behalf of the NFS client. 63 * It does not have to be running for correct operation, but will 64 * improve throughput. 65 */ 66 int 67 main(int argc, char **argv) 68 { 69 int ch, num_servers; 70 struct vfsconf vfc; 71 int error; 72 73 error = getvfsbyname("nfs", &vfc); 74 if (error && vfsisloadable("nfs")) { 75 if (vfsload("nfs")) 76 err(1, "vfsload(nfs)"); 77 endvfsent(); /* flush cache */ 78 error = getvfsbyname("nfs", &vfc); 79 } 80 if(error) 81 errx(1, "NFS support is not available in the running kernel"); 82 83 #define MAXNFSDCNT 20 84 #define DEFNFSDCNT 1 85 num_servers = DEFNFSDCNT; 86 while ((ch = getopt(argc, argv, "n:")) != -1) 87 switch (ch) { 88 case 'n': 89 num_servers = atoi(optarg); 90 if (num_servers < 1 || num_servers > MAXNFSDCNT) { 91 warnx("nfsiod count %d; reset to %d", 92 num_servers, DEFNFSDCNT); 93 num_servers = DEFNFSDCNT; 94 } 95 break; 96 default: 97 usage(); 98 } 99 argc -= optind; 100 argv += optind; 101 102 /* 103 * XXX 104 * Backward compatibility, trailing number is the count of daemons. 105 */ 106 if (argc > 1) 107 usage(); 108 if (argc == 1) { 109 num_servers = atoi(argv[0]); 110 if (num_servers < 1 || num_servers > MAXNFSDCNT) { 111 warnx("nfsiod count %d; reset to %d", num_servers, 112 DEFNFSDCNT); 113 num_servers = DEFNFSDCNT; 114 } 115 } 116 117 if (debug == 0) { 118 daemon(0, 0); 119 signal(SIGHUP, SIG_IGN); 120 signal(SIGINT, SIG_IGN); 121 signal(SIGQUIT, SIG_IGN); 122 signal(SIGSYS, nonfs); 123 } 124 signal(SIGCHLD, reapchild); 125 126 openlog("nfsiod:", LOG_PID, LOG_DAEMON); 127 128 while (num_servers--) 129 switch (fork()) { 130 case -1: 131 syslog(LOG_ERR, "fork: %m"); 132 exit (1); 133 case 0: 134 if (nfssvc(NFSSVC_BIOD, NULL) < 0) { 135 syslog(LOG_ERR, "nfssvc: %m"); 136 exit (1); 137 } 138 exit(0); 139 } 140 exit (0); 141 } 142 143 static void 144 nonfs(int signo __unused) 145 { 146 syslog(LOG_ERR, "missing system call: NFS not available"); 147 } 148 149 static void 150 reapchild(int signo __unused) 151 { 152 153 while (wait3(NULL, WNOHANG, NULL) > 0) 154 ; 155 } 156 157 static void 158 usage(void) 159 { 160 fprintf(stderr, "usage: nfsiod [-n num_servers]\n"); 161 exit(1); 162 } 163