Invalid superblock after e2fsck

[tytso at mit.edu]

On Sun, Feb 21, 2010 at 03:00:15PM +0100, Albert Sellarès wrote:
> 
> e2fsck quits after the bad magic number message. I didn't pasted the
> entire e2fsck output (sorry!). The full output was that:
> 
> root at pacs:~# e2fsck -C 0 -y -t /dev/storage/cabina_snapshot2
> e2fsck 1.41.9 (22-Aug-2009)
> /dev/storage/cabina_snapshot2 contains a file system with errors, check
> forced.
> Pass 1: Checking inodes, blocks, and sizes
> /dev/storage/cabina_snapshot2: |==================              / 60.0%
> 
> [...]
> 
> Until 60% of the progress bar, there was no error messages. After reach
> the 60%, e2fsck started fixing a lot of things. In the output I
> recognized the inode that it was analyzing. Once e2fsck analyzed the
> last inode of the filesystem, it printed this message and exited:

So *do* you have the full e2fsck output?  I'd like to look at it to
see what it did.  It's _possible_ that a really badly corrupted file
system block might have caused it to get confused enough such that it
managed to overwrite the superblock while trying to fix the
filesystem.  But unless I see the whole e2fsck output, it's hard to
say for sure what happened.

						- Ted