How are alternate superblocks repaired?

Thomas Watt tango at
Thu Oct 4 04:15:26 UTC 2007


Turns out there was a way to fully test the script which is attached:

Looking forward to the new and improved filesystems from you and your filesystem colleagues.


-- Tom

-----Original Message-----
>From: Theodore Tso <tytso at>
>Sent: Oct 3, 2007 2:44 PM
>To: Thomas Watt <tango at>
>Cc: Andreas Dilger <adilger at>, ext3-users at
>Subject: Re: How are alternate superblocks repaired?
>On Tue, Oct 02, 2007 at 05:59:11PM -0400, Theodore Tso wrote:
>> I'm a bit dubious about how useful simply structure matching would be
>> for modern Linux systems, since a large number of errors really are
>    sorry, I meant to say "filesystems", not "systems" above
>> silent bit flips in the data, that wouldn't be detected simply by
>> checking the expected structure ID at the beginning of the on-disk
>> object.  We are planning on adding checksum to metadata for ext4,
>> which will help a lot in terms of detected bad metadata.
>  	     	    	   	 - Ted
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