netbsd-help: Re: Find super-block backups
Subject: Re: Find super-block backups
To: =?ISO-8859-1?Q?Johan_Kr=FCger-Haglert?=
<aliquis@link-net.org>
From: Herb Peyerl
<hpeyerl@beer.org>
List: netbsd-help
Date: 01/02/2006 10:01:48
On Jan 2, 2006, at 9:59 AM, Johan Kr=FCger-Haglert wrote:
> I have (had) a NetBSD 2.x machine using a 40GB drive and ffsv2.
> However something failed and I get errors like these on the console:
I wrote this in 1995 after I had a minor 'incident'. I have no idea =20
whether it's still applicable and may not compile without some =20
changes.....
No warranty blah blah blah....
/*
* Copyright (c) 1995 Herb Peyerl <hpeyerl@novatel.ca>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the =20
distribution.
* 3. All advertising materials mentioning features or use of this =20
software
* must display the following acknowledgement:
* This product includes software developed by Herb Peyerl.
* 4. The name of Herb Peyerl may not be used to endorse or promote =20
products
* derived from this software without specific prior written =20
permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED =20
WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE =20
DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES =20
(INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS =20
OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE =20
USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: scour.c,v 1.7 1999年06月06日 15:27:54 hpeyerl Exp $
*/
/*
* Frightening program to scour a disk and search for superblocks and
* print out the associated filesystem sizes and disk offsets of the
* filesystems.
*
* Useful when you "accidentally" lose your disklabel.
*
* Lots of assumptions are made:
* Filesystems are placed on block boundaries.
* If we find FS_MAGIC and the correct number of SPC then we have a =20=
valid
* superblock.
* That the filesystems were at some point mounted on a machine and =20=
that
* the location of the mountpoint is present. Take out the if=20
(strlen)
* if you don't like this assumption.
* We don't back-calculate the location and size of the swap partition
* because that would entail making another assumption.
*
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/param.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
/*
* Change the SPC to be the Sectors/Cylinder attribute. (sectors * heads)
* (This should either be passed in as an argument or felched out of the
* kernel somewhere... Probably read the disklabel.
*/
#define SPC 780
main(argc, argv)
int argc;
char *argv[];
{
char buf[BBSIZE];
struct fs *fs;
FILE *fp;
int x;
int boffset;
if (argc < 2)
errx(1, "Need device argument.");
if ((fp =3D fopen(argv[1], "r")) =3D=3D NULL)
err(1, "fopen");
fs =3D (struct fs *)buf;
boffset =3D 0;
while (!feof(fp)) {
fread(buf, BBSIZE, 1, fp);
boffset +=3D BBSIZE;
for(x=3D0; x+sizeof(struct fs) < BBSIZE; x++) {
fs =3D (struct fs *)(buf + x);
if (fs->fs_magic =3D=3D FS_MAGIC && fs->fs_spc =20=
=3D=3D SPC) {
if (strlen(fs->fs_fsmnt) =3D=3D 0)
continue;
printf ("[%s]:diskoffset->[%ld] =20
fs_size->[%ld]\n",
fs->fs_fsmnt,
(boffset/512)+(x/512) - 32,
fs->fs_size);
}
}
}
}