namecache work stage 2: move struct namecache to its own header file and
[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 $
38a690d7 39 * $DragonFly: src/sbin/mount_null/mount_null.c,v 1.3 2003/08/08 04:18:40 dillon 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
64main(argc, argv)
65 int argc;
66 char *argv[];
67{
68 struct null_args args;
69 int ch, mntflags;
70 char source[MAXPATHLEN];
71 char target[MAXPATHLEN];
72 struct vfsconf vfc;
73 int error;
74
75 mntflags = 0;
76 while ((ch = getopt(argc, argv, "o:")) != -1)
77 switch(ch) {
78 case 'o':
79 getmntopts(optarg, mopts, &mntflags, 0);
80 break;
81 case '?':
82 default:
83 usage();
84 }
85 argc -= optind;
86 argv += optind;
87
88 if (argc != 2)
89 usage();
90
91 /* resolve target and source with realpath(3) */
92 (void)checkpath(argv[0], target);
93 (void)checkpath(argv[1], source);
94
95 if (subdir(target, source) || subdir(source, target))
96 errx(EX_USAGE, "%s (%s) and %s are not distinct paths",
97 argv[0], target, argv[1]);
98
99 args.target = target;
100
101 error = getvfsbyname("null", &vfc);
102 if (error && vfsisloadable("null")) {
103 if(vfsload("null"))
104 err(EX_OSERR, "vfsload(null)");
105 endvfsent();
106 error = getvfsbyname("null", &vfc);
107 }
108 if (error)
109 errx(EX_OSERR, "null/loopback filesystem is not available");
110
111 if (mount(vfc.vfc_name, source, mntflags, &args))
112 err(1, NULL);
113 exit(0);
114}
115
116int
117subdir(p, dir)
118 const char *p;
119 const char *dir;
120{
121 int l;
122
123 l = strlen(dir);
124 if (l <= 1)
125 return (1);
126
127 if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0'))
128 return (1);
129
130 return (0);
131}
132
133static void
134usage()
135{
136 (void)fprintf(stderr,
137 "usage: mount_null [-o options] target_fs mount_point\n");
138 exit(1);
139}