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 37 #ifndef lint 38 static char copyright[] = 39 "@(#) Copyright (c) 1989, 1993\n\ 40 The Regents of the University of California. All rights reserved.\n"; 41 #endif not lint 42 43 #ifndef lint 44 static char sccsid[] = "@(#)nfsiod.c 8.3 (Berkeley) 2/22/94"; 45 #endif not lint 46 47 #include <sys/param.h> 48 #include <sys/ioctl.h> 49 #include <sys/syslog.h> 50 #include <sys/ucred.h> 51 #include <sys/wait.h> 52 #include <sys/mount.h> 53 #include <sys/time.h> 54 55 #include <nfs/rpcv2.h> 56 #include <nfs/nfsproto.h> 57 #include <nfs/nfs.h> 58 59 #include <err.h> 60 #include <errno.h> 61 #include <fcntl.h> 62 #include <signal.h> 63 #include <stdio.h> 64 #include <stdlib.h> 65 #include <unistd.h> 66 67 /* Global defs */ 68 #ifdef DEBUG 69 int debug = 1; 70 #else 71 int debug = 0; 72 #endif 73 74 void nonfs __P((int)); 75 void reapchild __P((int)); 76 void usage __P((void)); 77 78 /* 79 * Nfsiod does asynchronous buffered I/O on behalf of the NFS client. 80 * It does not have to be running for correct operation, but will 81 * improve throughput. 82 */ 83 int 84 main(argc, argv) 85 int argc; 86 char *argv[]; 87 { 88 int ch, num_servers; 89 struct vfsconf *vfc; 90 91 vfc = getvfsbyname("nfs"); 92 if(!vfc && vfsisloadable("nfs")) { 93 if(vfsload("nfs")) 94 err(1, "vfsload(nfs)"); 95 endvfsent(); /* flush cache */ 96 vfc = getvfsbyname("nfs"); 97 } 98 99 if(!vfc) { 100 errx(1, "NFS support is not available in the running kernel"); 101 } 102 103 #define MAXNFSDCNT 20 104 #define DEFNFSDCNT 1 105 num_servers = DEFNFSDCNT; 106 while ((ch = getopt(argc, argv, "n:")) != EOF) 107 switch (ch) { 108 case 'n': 109 num_servers = atoi(optarg); 110 if (num_servers < 1 || num_servers > MAXNFSDCNT) { 111 warnx("nfsiod count %d; reset to %d", 112 DEFNFSDCNT); 113 num_servers = DEFNFSDCNT; 114 } 115 break; 116 case '?': 117 default: 118 usage(); 119 } 120 argc -= optind; 121 argv += optind; 122 123 /* 124 * XXX 125 * Backward compatibility, trailing number is the count of daemons. 126 */ 127 if (argc > 1) 128 usage(); 129 if (argc == 1) { 130 num_servers = atoi(argv[0]); 131 if (num_servers < 1 || num_servers > MAXNFSDCNT) { 132 warnx("nfsiod count %d; reset to %d", DEFNFSDCNT); 133 num_servers = DEFNFSDCNT; 134 } 135 } 136 137 if (debug == 0) { 138 daemon(0, 0); 139 (void)signal(SIGHUP, SIG_IGN); 140 (void)signal(SIGINT, SIG_IGN); 141 (void)signal(SIGQUIT, SIG_IGN); 142 (void)signal(SIGSYS, nonfs); 143 } 144 (void)signal(SIGCHLD, reapchild); 145 146 openlog("nfsiod:", LOG_PID, LOG_DAEMON); 147 148 while (num_servers--) 149 switch (fork()) { 150 case -1: 151 syslog(LOG_ERR, "fork: %m"); 152 exit (1); 153 case 0: 154 if (nfssvc(NFSSVC_BIOD, NULL) < 0) { 155 syslog(LOG_ERR, "nfssvc: %m"); 156 exit (1); 157 } 158 exit(0); 159 } 160 exit (0); 161 } 162 163 void 164 nonfs(signo) 165 int signo; 166 { 167 syslog(LOG_ERR, "missing system call: NFS not available."); 168 } 169 170 void 171 reapchild(signo) 172 int signo; 173 { 174 175 while (wait3(NULL, WNOHANG, NULL) > 0) { 176 /* nothing */ 177 }; 178 } 179 180 void 181 usage() 182 { 183 (void)fprintf(stderr, "usage: nfsiod [-n num_servers]\n"); 184 exit(1); 185 } 186