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 */
36
37 #include <sys/param.h>
38 #include <sys/syslog.h>
39 #include <sys/wait.h>
40 #include <sys/mount.h>
41
42 #include <vfs/nfs/rpcv2.h>
43 #include <vfs/nfs/nfs.h>
44
45 #include <err.h>
46 #include <stdio.h>
47 #include <stdlib.h>
48 #include <unistd.h>
49
50 /* Global defs */
51 #ifdef DEBUG
52 int debug = 1;
53 #else
54 int debug = 0;
55 #endif
56
57 static void nonfs(int);
58 static void reapchild(int);
59 static void usage(void);
60
61 /*
62 * Nfsiod does asynchronous buffered I/O on behalf of the NFS client.
63 * It does not have to be running for correct operation, but will
64 * improve throughput.
65 */
66 int
main(int argc,char ** argv)67 main(int argc, char **argv)
68 {
69 int ch, num_servers;
70 struct vfsconf vfc;
71 int error;
72
73 error = getvfsbyname("nfs", &vfc);
74 if (error && vfsisloadable("nfs")) {
75 if (vfsload("nfs"))
76 err(1, "vfsload(nfs)");
77 endvfsent(); /* flush cache */
78 error = getvfsbyname("nfs", &vfc);
79 }
80 if(error)
81 errx(1, "NFS support is not available in the running kernel");
82
83 #define MAXNFSDCNT 20
84 #define DEFNFSDCNT 1
85 num_servers = DEFNFSDCNT;
86 while ((ch = getopt(argc, argv, "n:")) != -1)
87 switch (ch) {
88 case 'n':
89 num_servers = atoi(optarg);
90 if (num_servers < 1 || num_servers > MAXNFSDCNT) {
91 warnx("nfsiod count %d; reset to %d",
92 num_servers, DEFNFSDCNT);
93 num_servers = DEFNFSDCNT;
94 }
95 break;
96 default:
97 usage();
98 }
99 argc -= optind;
100 argv += optind;
101
102 /*
103 * XXX
104 * Backward compatibility, trailing number is the count of daemons.
105 */
106 if (argc > 1)
107 usage();
108 if (argc == 1) {
109 num_servers = atoi(argv[0]);
110 if (num_servers < 1 || num_servers > MAXNFSDCNT) {
111 warnx("nfsiod count %d; reset to %d", num_servers,
112 DEFNFSDCNT);
113 num_servers = DEFNFSDCNT;
114 }
115 }
116
117 if (debug == 0) {
118 daemon(0, 0);
119 signal(SIGHUP, SIG_IGN);
120 signal(SIGINT, SIG_IGN);
121 signal(SIGQUIT, SIG_IGN);
122 signal(SIGSYS, nonfs);
123 }
124 signal(SIGCHLD, reapchild);
125
126 openlog("nfsiod:", LOG_PID, LOG_DAEMON);
127
128 while (num_servers--)
129 switch (fork()) {
130 case -1:
131 syslog(LOG_ERR, "fork: %m");
132 exit (1);
133 case 0:
134 if (nfssvc(NFSSVC_BIOD, NULL) < 0) {
135 syslog(LOG_ERR, "nfssvc: %m");
136 exit (1);
137 }
138 exit(0);
139 }
140 exit (0);
141 }
142
143 static void
nonfs(int signo __unused)144 nonfs(int signo __unused)
145 {
146 syslog(LOG_ERR, "missing system call: NFS not available");
147 }
148
149 static void
reapchild(int signo __unused)150 reapchild(int signo __unused)
151 {
152
153 while (wait3(NULL, WNOHANG, NULL) > 0)
154 ;
155 }
156
157 static void
usage(void)158 usage(void)
159 {
160 fprintf(stderr, "usage: nfsiod [-n num_servers]\n");
161 exit(1);
162 }
163