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107 lines
3.3 KiB
C
107 lines
3.3 KiB
C
/*
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#) Copyright (c) 1992, 1993, 1994 The Regents of the University of California. All rights reserved.
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* @(#)mount_null.c 8.6 (Berkeley) 4/26/95
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* $FreeBSD: src/sbin/mount_null/mount_null.c,v 1.13 1999/10/09 11:54:11 phk Exp $
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*/
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <vfs/nullfs/null.h>
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#include <err.h>
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#include <mntopts.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sysexits.h>
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#include <unistd.h>
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static struct mntopt mopts[] = {
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MOPT_STDOPTS,
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MOPT_UPDATE,
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MOPT_NULL
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};
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static void usage(void) __dead2;
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int
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mount_null(const char *src, const char *dst)
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{
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struct null_args args;
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int ch, mntflags;
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char source[MAXPATHLEN];
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char target[MAXPATHLEN];
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struct vfsconf vfc;
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int error;
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bzero(&args, sizeof(args));
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mntflags = 0;
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args.target = target;
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checkpath(src, target);
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checkpath(dst, source);
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/*
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* Mount points that did not use distinct paths (e.g. / on /mnt)
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* used to be disallowed because mount linkages were stored in
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* vnodes and would lead to endlessly recursive trees. DragonFly
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* stores mount linkages in the namecache topology and does not
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* have this problem, so paths no longer need to be distinct.
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*/
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error = getvfsbyname("null", &vfc);
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if (error && vfsisloadable("null")) {
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if(vfsload("null"))
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err(EX_OSERR, "vfsload(null)");
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endvfsent();
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error = getvfsbyname("null", &vfc);
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}
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if (error)
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errx(EX_OSERR, "null/loopback filesystem is not available");
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if (mount(vfc.vfc_name, source, mntflags, &args))
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err(1, NULL);
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return 0;
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}
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static void
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usage(void)
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{
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fprintf(stderr,
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"usage: mount_null [-o options] target_fs mount_point\n");
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fprintf(stderr,
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" mount_null -u [-o options] mount_point\n");
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exit(1);
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}
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