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
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9 * modification, are permitted provided that the following conditions
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12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
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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
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36 * @(#) Copyright (c) 1992, 1993, 1994 The Regents of the University of California. All rights reserved.
37 * @(#)mount_union.c 8.5 (Berkeley) 3/27/94
38 * $FreeBSD: src/sbin/mount_union/mount_union.c,v 1.12 1999/10/09 11:54:14 phk Exp $
41 #include <sys/param.h>
42 #include <sys/mount.h>
44 #include <vfs/union/union.h>
54 static struct mntopt mopts[] = {
59 static int subdir(const char *, const char *);
60 static void usage(void) __dead2;
63 main(int argc, char **argv)
65 struct union_args args;
67 char source[MAXPATHLEN];
68 char target[MAXPATHLEN];
73 args.mntflags = UNMNT_ABOVE;
74 while ((ch = getopt(argc, argv, "bo:r")) != -1)
77 args.mntflags &= ~UNMNT_OPMASK;
78 args.mntflags |= UNMNT_BELOW;
81 getmntopts(optarg, mopts, &mntflags, 0);
84 args.mntflags &= ~UNMNT_OPMASK;
85 args.mntflags |= UNMNT_REPLACE;
98 /* resolve both target and source with realpath(3) */
99 checkpath(argv[0], target);
100 checkpath(argv[1], source);
102 if (subdir(target, source) || subdir(source, target))
103 errx(EX_USAGE, "%s (%s) and %s (%s) are not distinct paths",
104 argv[0], target, argv[1], source);
106 args.target = target;
108 error = getvfsbyname("union", &vfc);
109 if (error && vfsisloadable("union")) {
110 if (vfsload("union"))
111 err(EX_OSERR, "vfsload(union)");
112 endvfsent(); /* flush cache */
113 error = getvfsbyname("union", &vfc);
116 errx(EX_OSERR, "union filesystem is not available");
118 if (mount(vfc.vfc_name, source, mntflags, &args))
119 err(EX_OSERR, "%s", target);
124 subdir(const char *p, const char *dir)
132 if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0'))
142 "usage: mount_union [-br] [-o options] target_fs mount_point\n");