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. 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 }