Unrecoverable error after conversion to ext4

[Jonathan Hudson]

On Mon, 19 Jan 2009 19:08:25 -0500, Rashkae wrote:

>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.
>

I don't think so:

# sfdisk -l /dev/sda

Disk /dev/sda: 19457 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0

   Device Boot Start     End   #cyls    #blocks   Id  System
/dev/sda1          0+      7       8-     64228+  fd  Linux RAID autodetect
/dev/sda2          8     493     486    3903795   fd  Linux RAID autodetect
/dev/sda3        494   19456   18963  152320297+  fd  Linux RAID autodetect
/dev/sda4          0       -       0          0    0  Empty


If any case, the device is a logical volume, so I'd be disappointed if
lvm had created overlapping devices. 

-jh