2 * Copyright (c) 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software donated to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
38 static const char copyright[] =
39 "@(#) Copyright (c) 1992, 1993, 1994\n\
40 The Regents of the University of California. All rights reserved.\n";
45 static char sccsid[] = "@(#)mount_null.c 8.6 (Berkeley) 4/26/95";
47 static const char rcsid[] =
48 "$FreeBSD: src/sbin/mount_null/mount_null.c,v 1.13 1999/10/09 11:54:11 phk Exp $";
51 #include <sys/param.h>
52 #include <sys/mount.h>
53 #include <miscfs/nullfs/null.h>
64 struct mntopt mopts[] = {
69 int subdir __P((const char *, const char *));
70 static void usage __P((void)) __dead2;
77 struct null_args args;
79 char source[MAXPATHLEN];
80 char target[MAXPATHLEN];
85 while ((ch = getopt(argc, argv, "o:")) != -1)
88 getmntopts(optarg, mopts, &mntflags, 0);
100 /* resolve target and source with realpath(3) */
101 (void)checkpath(argv[0], target);
102 (void)checkpath(argv[1], source);
104 if (subdir(target, source) || subdir(source, target))
105 errx(EX_USAGE, "%s (%s) and %s are not distinct paths",
106 argv[0], target, argv[1]);
108 args.target = target;
110 error = getvfsbyname("null", &vfc);
111 if (error && vfsisloadable("null")) {
113 err(EX_OSERR, "vfsload(null)");
115 error = getvfsbyname("null", &vfc);
118 errx(EX_OSERR, "null/loopback filesystem is not available");
120 if (mount(vfc.vfc_name, source, mntflags, &args))
136 if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0'))
145 (void)fprintf(stderr,
146 "usage: mount_null [-o options] target_fs mount_point\n");