Subject: Re: Partition table on x86 trashed. Any ideas?
To: Gerald Heinig <Gerald.Heinig@post.rwth-aachen.de>
From: Giles Lean <giles@nemeton.com.au>
List: netbsd-users
Date: 09/09/2001 06:57:23
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Content-ID: <10757.999982471.1@nemeton.com.au>
> My question is: how do I resurrect my partition table?
I've not had to do that precisely, but I have had to locate
filesystems within a NetBSD partition which I did by looking for
blocks with FS_MAGIC at the right offset.
Perhaps you could work out a suitable partition table by working out
where the filesystems are? For what it's worth, findsb.c is below.
Good luck,
Giles
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/*
* Find superblocks on a BSD FFS filesystem.
*/
#include <sys/param.h>
#include <sys/types.h>
#include <ufs/ufs/dinode.h>
#include <ufs/ffs/fs.h>
#include <fcntl.h>
#include <stdio.h>
/*
* If this is smaller than the filesystem block size expect
* more false matches.
*/
#define BLOCKSIZE (4 * 1024)
int
main(int argc, char *argv[])
{
char block[BLOCKSIZE];
int fd;
struct fs *filesys;
int n;
int blockno;
blockno = 0;
filesys = (struct fs *) block;
if (argc != 2) {
fprintf(stderr, "usage: findsb raw_device\n");
exit(1);
}
if ((fd = open(argv[1], O_RDONLY)) < 0) {
perror(argv[1]);
exit(1);
}
while ((n = read(fd, block, BLOCKSIZE)) == BLOCKSIZE) {
if (filesys->fs_magic == FS_MAGIC)
printf("%d\n", blockno * (BLOCKSIZE / 512));
blockno++;
}
}
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