sbin/nfsiod/nfsiod.c

   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  * $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 }