Remove the matching for the host to PCI bridge, since this is actually
[dragonfly.git] / sbin / mount_null / mount_null.c
CommitLineData
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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 $
b5744197 39 * $DragonFly: src/sbin/mount_null/mount_null.c,v 1.4 2003/09/28 14:39:19 hmp Exp $
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40 */
41
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42#include <sys/param.h>
43#include <sys/mount.h>
38a690d7 44#include <vfs/nullfs/null.h>
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45
46#include <err.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <string.h>
50#include <sysexits.h>
51#include <unistd.h>
52
53#include "mntopts.h"
54
55struct mntopt mopts[] = {
56 MOPT_STDOPTS,
57 { NULL }
58};
59
60int subdir __P((const char *, const char *));
61static void usage __P((void)) __dead2;
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) */
90 (void)checkpath(argv[0], target);
91 (void)checkpath(argv[1], source);
92
93 if (subdir(target, source) || subdir(source, target))
94 errx(EX_USAGE, "%s (%s) and %s are not distinct paths",
95 argv[0], target, argv[1]);
96
97 args.target = target;
98
99 error = getvfsbyname("null", &vfc);
100 if (error && vfsisloadable("null")) {
101 if(vfsload("null"))
102 err(EX_OSERR, "vfsload(null)");
103 endvfsent();
104 error = getvfsbyname("null", &vfc);
105 }
106 if (error)
107 errx(EX_OSERR, "null/loopback filesystem is not available");
108
109 if (mount(vfc.vfc_name, source, mntflags, &args))
110 err(1, NULL);
111 exit(0);
112}
113
114int
b5744197 115subdir(const char *p, const char *dir)
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116{
117 int l;
118
119 l = strlen(dir);
120 if (l <= 1)
121 return (1);
122
123 if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0'))
124 return (1);
125
126 return (0);
127}
128
129static void
b5744197 130usage(void)
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131{
132 (void)fprintf(stderr,
133 "usage: mount_null [-o options] target_fs mount_point\n");
134 exit(1);
135}