xref: /dragonfly/sbin/nfsiod/nfsiod.c (revision 25a2db75)
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  * 4. 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 }
164