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 * 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.
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
32 * @(#) Copyright (c) 1992, 1993, 1994 The Regents of the University of California. All rights reserved.
33 * @(#)mount_union.c 8.5 (Berkeley) 3/27/94
34 * $FreeBSD: src/sbin/mount_union/mount_union.c,v 1.12 1999/10/09 11:54:14 phk Exp $
37 #include <sys/param.h>
38 #include <sys/mount.h>
40 #include <vfs/union/union.h>
50 static struct mntopt mopts[] = {
55 static int subdir(const char *, const char *);
56 static void usage(void) __dead2;
59 main(int argc, char **argv)
61 struct union_args args;
63 char source[MAXPATHLEN];
64 char target[MAXPATHLEN];
69 args.mntflags = UNMNT_ABOVE;
70 while ((ch = getopt(argc, argv, "bo:r")) != -1)
73 args.mntflags &= ~UNMNT_OPMASK;
74 args.mntflags |= UNMNT_BELOW;
77 getmntopts(optarg, mopts, &mntflags, 0);
80 args.mntflags &= ~UNMNT_OPMASK;
81 args.mntflags |= UNMNT_REPLACE;
94 /* resolve both target and source with realpath(3) */
95 checkpath(argv[0], target);
96 checkpath(argv[1], source);
98 if (subdir(target, source) || subdir(source, target))
99 errx(EX_USAGE, "%s (%s) and %s (%s) are not distinct paths",
100 argv[0], target, argv[1], source);
102 args.target = target;
104 error = getvfsbyname("union", &vfc);
105 if (error && vfsisloadable("union")) {
106 if (vfsload("union"))
107 err(EX_OSERR, "vfsload(union)");
108 endvfsent(); /* flush cache */
109 error = getvfsbyname("union", &vfc);
112 errx(EX_OSERR, "union filesystem is not available");
114 if (mount(vfc.vfc_name, source, mntflags, &args))
115 err(EX_OSERR, "%s", target);
120 subdir(const char *p, const char *dir)
128 if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0'))
138 "usage: mount_union [-br] [-o options] target_fs mount_point\n");