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 * 4. 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 * $DragonFly: src/sbin/nfsiod/nfsiod.c,v 1.5 2004/11/14 20:07:25 liamfoy Exp $ 36 */ 37 38 #include <sys/param.h> 39 #include <sys/syslog.h> 40 #include <sys/wait.h> 41 #include <sys/mount.h> 42 43 #include <nfs/rpcv2.h> 44 #include <nfs/nfs.h> 45 46 #include <err.h> 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <unistd.h> 50 51 /* Global defs */ 52 #ifdef DEBUG 53 int debug = 1; 54 #else 55 int debug = 0; 56 #endif 57 58 static void nonfs(int); 59 static void reapchild(int); 60 static void usage(void); 61 62 /* 63 * Nfsiod does asynchronous buffered I/O on behalf of the NFS client. 64 * It does not have to be running for correct operation, but will 65 * improve throughput. 66 */ 67 int 68 main(int argc, char **argv) 69 { 70 int ch, num_servers; 71 struct vfsconf vfc; 72 int error; 73 74 error = getvfsbyname("nfs", &vfc); 75 if (error && vfsisloadable("nfs")) { 76 if (vfsload("nfs")) 77 err(1, "vfsload(nfs)"); 78 endvfsent(); /* flush cache */ 79 error = getvfsbyname("nfs", &vfc); 80 } 81 if(error) 82 errx(1, "NFS support is not available in the running kernel"); 83 84 #define MAXNFSDCNT 20 85 #define DEFNFSDCNT 1 86 num_servers = DEFNFSDCNT; 87 while ((ch = getopt(argc, argv, "n:")) != -1) 88 switch (ch) { 89 case 'n': 90 num_servers = atoi(optarg); 91 if (num_servers < 1 || num_servers > MAXNFSDCNT) { 92 warnx("nfsiod count %d; reset to %d", 93 num_servers, DEFNFSDCNT); 94 num_servers = DEFNFSDCNT; 95 } 96 break; 97 default: 98 usage(); 99 } 100 argc -= optind; 101 argv += optind; 102 103 /* 104 * XXX 105 * Backward compatibility, trailing number is the count of daemons. 106 */ 107 if (argc > 1) 108 usage(); 109 if (argc == 1) { 110 num_servers = atoi(argv[0]); 111 if (num_servers < 1 || num_servers > MAXNFSDCNT) { 112 warnx("nfsiod count %d; reset to %d", num_servers, 113 DEFNFSDCNT); 114 num_servers = DEFNFSDCNT; 115 } 116 } 117 118 if (debug == 0) { 119 daemon(0, 0); 120 signal(SIGHUP, SIG_IGN); 121 signal(SIGINT, SIG_IGN); 122 signal(SIGQUIT, SIG_IGN); 123 signal(SIGSYS, nonfs); 124 } 125 signal(SIGCHLD, reapchild); 126 127 openlog("nfsiod:", LOG_PID, LOG_DAEMON); 128 129 while (num_servers--) 130 switch (fork()) { 131 case -1: 132 syslog(LOG_ERR, "fork: %m"); 133 exit (1); 134 case 0: 135 if (nfssvc(NFSSVC_BIOD, NULL) < 0) { 136 syslog(LOG_ERR, "nfssvc: %m"); 137 exit (1); 138 } 139 exit(0); 140 } 141 exit (0); 142 } 143 144 static void 145 nonfs(int signo __unused) 146 { 147 syslog(LOG_ERR, "missing system call: NFS not available"); 148 } 149 150 static void 151 reapchild(int signo __unused) 152 { 153 154 while (wait3(NULL, WNOHANG, NULL) > 0) 155 ; 156 } 157 158 static void 159 usage(void) 160 { 161 fprintf(stderr, "usage: nfsiod [-n num_servers]\n"); 162 exit(1); 163 } 164