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_union.c 8.5 (Berkeley) 3/27/94";
47 static const char rcsid[] =
48 "$FreeBSD: src/sbin/mount_union/mount_union.c,v 1.12 1999/10/09 11:54:14 phk Exp $";
52 #include <sys/param.h>
53 #include <sys/mount.h>
55 #include <miscfs/union/union.h>
66 static struct mntopt mopts[] = {
71 static int subdir __P((const char *, const char *));
72 static void usage __P((void)) __dead2;
79 struct union_args args;
81 char source[MAXPATHLEN];
82 char target[MAXPATHLEN];
87 args.mntflags = UNMNT_ABOVE;
88 while ((ch = getopt(argc, argv, "bo:r")) != -1)
91 args.mntflags &= ~UNMNT_OPMASK;
92 args.mntflags |= UNMNT_BELOW;
95 getmntopts(optarg, mopts, &mntflags, 0);
98 args.mntflags &= ~UNMNT_OPMASK;
99 args.mntflags |= UNMNT_REPLACE;
112 /* resolve both target and source with realpath(3) */
113 (void)checkpath(argv[0], target);
114 (void)checkpath(argv[1], source);
116 if (subdir(target, source) || subdir(source, target))
117 errx(EX_USAGE, "%s (%s) and %s (%s) are not distinct paths",
118 argv[0], target, argv[1], source);
120 args.target = target;
122 error = getvfsbyname("union", &vfc);
123 if (error && vfsisloadable("union")) {
124 if (vfsload("union"))
125 err(EX_OSERR, "vfsload(union)");
126 endvfsent(); /* flush cache */
127 error = getvfsbyname("union", &vfc);
130 errx(EX_OSERR, "union filesystem is not available");
132 if (mount(vfc.vfc_name, source, mntflags, &args))
133 err(EX_OSERR, "%s", target);
148 if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0'))
157 (void)fprintf(stderr,
158 "usage: mount_union [-br] [-o options] target_fs mount_point\n");