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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#) Copyright (c) 1989, 1993 The Regents of the University of California. All rights reserved. 37 * @(#)nfsiod.c 8.4 (Berkeley) 5/3/95 38 * $FreeBSD: src/sbin/nfsiod/nfsiod.c,v 1.9 1999/08/28 00:13:55 peter Exp $ 39 * $DragonFly: src/sbin/nfsiod/nfsiod.c,v 1.5 2004/11/14 20:07:25 liamfoy Exp $ 40 */ 41 42 #include <sys/param.h> 43 #include <sys/syslog.h> 44 #include <sys/wait.h> 45 #include <sys/mount.h> 46 47 #include <nfs/rpcv2.h> 48 #include <nfs/nfs.h> 49 50 #include <err.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <unistd.h> 54 55 /* Global defs */ 56 #ifdef DEBUG 57 int debug = 1; 58 #else 59 int debug = 0; 60 #endif 61 62 static void nonfs(int); 63 static void reapchild(int); 64 static void usage(void); 65 66 /* 67 * Nfsiod does asynchronous buffered I/O on behalf of the NFS client. 68 * It does not have to be running for correct operation, but will 69 * improve throughput. 70 */ 71 int 72 main(int argc, char **argv) 73 { 74 int ch, num_servers; 75 struct vfsconf vfc; 76 int error; 77 78 error = getvfsbyname("nfs", &vfc); 79 if (error && vfsisloadable("nfs")) { 80 if (vfsload("nfs")) 81 err(1, "vfsload(nfs)"); 82 endvfsent(); /* flush cache */ 83 error = getvfsbyname("nfs", &vfc); 84 } 85 if(error) 86 errx(1, "NFS support is not available in the running kernel"); 87 88 #define MAXNFSDCNT 20 89 #define DEFNFSDCNT 1 90 num_servers = DEFNFSDCNT; 91 while ((ch = getopt(argc, argv, "n:")) != -1) 92 switch (ch) { 93 case 'n': 94 num_servers = atoi(optarg); 95 if (num_servers < 1 || num_servers > MAXNFSDCNT) { 96 warnx("nfsiod count %d; reset to %d", 97 num_servers, DEFNFSDCNT); 98 num_servers = DEFNFSDCNT; 99 } 100 break; 101 default: 102 usage(); 103 } 104 argc -= optind; 105 argv += optind; 106 107 /* 108 * XXX 109 * Backward compatibility, trailing number is the count of daemons. 110 */ 111 if (argc > 1) 112 usage(); 113 if (argc == 1) { 114 num_servers = atoi(argv[0]); 115 if (num_servers < 1 || num_servers > MAXNFSDCNT) { 116 warnx("nfsiod count %d; reset to %d", num_servers, 117 DEFNFSDCNT); 118 num_servers = DEFNFSDCNT; 119 } 120 } 121 122 if (debug == 0) { 123 daemon(0, 0); 124 signal(SIGHUP, SIG_IGN); 125 signal(SIGINT, SIG_IGN); 126 signal(SIGQUIT, SIG_IGN); 127 signal(SIGSYS, nonfs); 128 } 129 signal(SIGCHLD, reapchild); 130 131 openlog("nfsiod:", LOG_PID, LOG_DAEMON); 132 133 while (num_servers--) 134 switch (fork()) { 135 case -1: 136 syslog(LOG_ERR, "fork: %m"); 137 exit (1); 138 case 0: 139 if (nfssvc(NFSSVC_BIOD, NULL) < 0) { 140 syslog(LOG_ERR, "nfssvc: %m"); 141 exit (1); 142 } 143 exit(0); 144 } 145 exit (0); 146 } 147 148 static void 149 nonfs(int signo __unused) 150 { 151 syslog(LOG_ERR, "missing system call: NFS not available"); 152 } 153 154 static void 155 reapchild(int signo __unused) 156 { 157 158 while (wait3(NULL, WNOHANG, NULL) > 0) 159 ; 160 } 161 162 static void 163 usage(void) 164 { 165 fprintf(stderr, "usage: nfsiod [-n num_servers]\n"); 166 exit(1); 167 } 168