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 8.4 (Berkeley) 5/3/95"; 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 int error; 91 92 error = getvfsbyname("nfs", &vfc); 93 if (error && vfsisloadable("nfs")) { 94 if (vfsload("nfs")) 95 err(1, "vfsload(nfs)"); 96 endvfsent(); /* flush cache */ 97 error = getvfsbyname("nfs", &vfc); 98 } 99 if(error) 100 errx(1, "NFS support is not available in the running kernel"); 101 102 #define MAXNFSDCNT 20 103 #define DEFNFSDCNT 1 104 num_servers = DEFNFSDCNT; 105 while ((ch = getopt(argc, argv, "n:")) != EOF) 106 switch (ch) { 107 case 'n': 108 num_servers = atoi(optarg); 109 if (num_servers < 1 || num_servers > MAXNFSDCNT) { 110 warnx("nfsiod count %d; reset to %d", 111 DEFNFSDCNT); 112 num_servers = DEFNFSDCNT; 113 } 114 break; 115 case '?': 116 default: 117 usage(); 118 } 119 argc -= optind; 120 argv += optind; 121 122 /* 123 * XXX 124 * Backward compatibility, trailing number is the count of daemons. 125 */ 126 if (argc > 1) 127 usage(); 128 if (argc == 1) { 129 num_servers = atoi(argv[0]); 130 if (num_servers < 1 || num_servers > MAXNFSDCNT) { 131 warnx("nfsiod count %d; reset to %d", DEFNFSDCNT); 132 num_servers = DEFNFSDCNT; 133 } 134 } 135 136 if (debug == 0) { 137 daemon(0, 0); 138 (void)signal(SIGHUP, SIG_IGN); 139 (void)signal(SIGINT, SIG_IGN); 140 (void)signal(SIGQUIT, SIG_IGN); 141 (void)signal(SIGSYS, nonfs); 142 } 143 (void)signal(SIGCHLD, reapchild); 144 145 openlog("nfsiod:", LOG_PID, LOG_DAEMON); 146 147 while (num_servers--) 148 switch (fork()) { 149 case -1: 150 syslog(LOG_ERR, "fork: %m"); 151 exit (1); 152 case 0: 153 if (nfssvc(NFSSVC_BIOD, NULL) < 0) { 154 syslog(LOG_ERR, "nfssvc: %m"); 155 exit (1); 156 } 157 exit(0); 158 } 159 exit (0); 160 } 161 162 void 163 nonfs(signo) 164 int signo; 165 { 166 syslog(LOG_ERR, "missing system call: NFS not available."); 167 } 168 169 void 170 reapchild(signo) 171 int signo; 172 { 173 174 while (wait3(NULL, WNOHANG, NULL) > 0) { 175 /* nothing */ 176 }; 177 } 178 179 void 180 usage() 181 { 182 (void)fprintf(stderr, "usage: nfsiod [-n num_servers]\n"); 183 exit(1); 184 } 185