Unrecoverable error after conversion to ext4

[Rashkae]

Jonathan Hudson wrote:
> I (attempted to) converted a scratch file system from ext3 to ext4 on
> Jaunty Alpha3. It appears the file system is now screwed (which I don't
> care about), as follows:
> 
> # umount /t/opt/
> # tune2fs -O extents,uninit_bg,dir_index  /dev/vol01/opt
> # fsck -f /dev/vol01/opt
> fsck 1.41.3 (12-Oct-2008)
> e2fsck 1.41.3 (12-Oct-2008)
> fsck.ext4: Group descriptors look bad... trying backup blocks...
> Group descriptor 81 checksum is invalid.  Fix<y>? yes
> 
> Group descriptor 125 checksum is invalid.  Fix<y>? yes
> 
> /opt contains a file system with errors, check forced.
> Pass 1: Checking inodes, blocks, and sizes
> Group 81's inode table at 2654210 conflicts with some other fs block.
> Relocate<y>? yes
> 
> Error allocating 512 contiguous block(s) in block group 81 for inode
> table: Could not allocate block in ext2 filesystem Restarting e2fsck
> from the beginning... 
> fsck.ext4: Group descriptors look bad... trying backup blocks...
> 
> (repeats for ever)
> 
> Any hints as to whether this is recoverable before I mkfs.ext4 over it?
> 
> -jh
> 
> 
> 

err, inode table conflicts with some other fs block?!?  I think you
should start fixing things with fdisk rather than mkfs.  Looks like you
managed to get overlapping partitions.