Unbreak buildworld: define _KERNEL_STRUCTURES for struct netexport.
[dragonfly.git] / sbin / mount_null / mount_null.c
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1/*
2 * Copyright (c) 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software donated to Berkeley by
6 * Jan-Simon Pendry.
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.
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35 *
36 * @(#) Copyright (c) 1992, 1993, 1994 The Regents of the University of California. All rights reserved.
37 * @(#)mount_null.c 8.6 (Berkeley) 4/26/95
38 * $FreeBSD: src/sbin/mount_null/mount_null.c,v 1.13 1999/10/09 11:54:11 phk Exp $
9e006342 39 * $DragonFly: src/sbin/mount_null/mount_null.c,v 1.10 2008/09/18 11:54:25 swildner Exp $
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40 */
41
9e006342 42#define _KERNEL_STRUCTURES
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43#include <sys/param.h>
44#include <sys/mount.h>
38a690d7 45#include <vfs/nullfs/null.h>
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46
47#include <err.h>
48#include <stdio.h>
49#include <stdlib.h>
50#include <string.h>
51#include <sysexits.h>
52#include <unistd.h>
53
54#include "mntopts.h"
55
56struct mntopt mopts[] = {
57 MOPT_STDOPTS,
c19a7073 58 MOPT_NULL
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59};
60
9a76cd75 61static void usage(void) __dead2;
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62
63int
b5744197 64main(int argc, char **argv)
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65{
66 struct null_args args;
67 int ch, mntflags;
68 char source[MAXPATHLEN];
69 char target[MAXPATHLEN];
70 struct vfsconf vfc;
71 int error;
72
73 mntflags = 0;
74 while ((ch = getopt(argc, argv, "o:")) != -1)
75 switch(ch) {
76 case 'o':
77 getmntopts(optarg, mopts, &mntflags, 0);
78 break;
79 case '?':
80 default:
81 usage();
82 }
83 argc -= optind;
84 argv += optind;
85
86 if (argc != 2)
87 usage();
88
89 /* resolve target and source with realpath(3) */
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90 checkpath(argv[0], target);
91 checkpath(argv[1], source);
984263bc 92
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93 /*
94 * Mount points that did not use distinct paths (e.g. / on /mnt)
95 * used to be disallowed because mount linkages were stored in
96 * vnodes and would lead to endlessly recursive trees. DragonFly
97 * stores mount linkages in the namecache topology and does not
98 * have this problem, so paths no longer need to be distinct.
99 */
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100 args.target = target;
101
102 error = getvfsbyname("null", &vfc);
103 if (error && vfsisloadable("null")) {
104 if(vfsload("null"))
105 err(EX_OSERR, "vfsload(null)");
106 endvfsent();
107 error = getvfsbyname("null", &vfc);
108 }
109 if (error)
110 errx(EX_OSERR, "null/loopback filesystem is not available");
111
112 if (mount(vfc.vfc_name, source, mntflags, &args))
113 err(1, NULL);
114 exit(0);
115}
116
984263bc 117static void
b5744197 118usage(void)
984263bc 119{
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120 fprintf(stderr,
121 "usage: mount_null [-o options] target_fs mount_point\n");
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122 exit(1);
123}