[8.0-RELEASE] ext2fs mount fails

[Aditya Sarawgi]

On Wed, Dec 09, 2009 at 12:38:10PM +0000, Mikle Krutov wrote:
> Hello,
> I'm currently migrating one of my systems from linux to fbsd, and i've
> chosen the ext2 fs as most compatible one.
> Problem is, i cannot mount it.
> mount -t ext2fs /dev/ad8p1 /tmp/ext2/1
> mount: /dev/ad8p1 : Invalid argument
> ext2fs: ad8p1: wrong magic number 0 (expected 0xef53)
> 
> It mounts normally under linux, and i've fsck'd it.
> Also, under fbsd i cannot even run fsck:
>  fsck_ext2fs /dev/ad8p1
> e2fsck 1.41.9 (22-Aug-2009)
> /sbin/e2fsck: Superblock invalid, trying backup blocks...
> /sbin/e2fsck: Bad magic number in super-block while trying to open /dev/ad8p1
> 
> The superblock could not be read or does not describe a correct ext2
> filesystem.  If the device is valid and it really contains an ext2
> filesystem (and not swap or ufs or something else), then the superblock
> is corrupt, and you might try running e2fsck with an alternate superblock:
>     e2fsck -b 8193 <device>
> I've found the sb backups with testdisk and tried the e2fsck -b
> <superblock_num> -B <block_size> <dev> - doesn't work, returns the
> very same message as above.
> Any suggestions?

Firstly make sure that ad8p1 does infact have a ext2/3 filesytem. If it 
is try getting a dump by using dumpe2fs on freebsd(you need e2fsprogs from 
ports for this) or linux and mail me the dump.  

-- 
Aditya Sarawgi