linux-ext4 - Re: fsck.ext4: Group descriptors look bad... trying backup blocks...

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Date:	Mon, 20 Apr 2009 13:54:46 +0100 (BST)
From:	Jeremy Sanders <jss@....cam.ac.uk>
To:	Theodore Tso <tytso@....edu>
cc:	linux-ext4@...r.kernel.org
Subject: Re: fsck.ext4: Group descriptors look bad... trying backup
 blocks...

On Mon, 20 Apr 2009, Theodore Tso wrote:

> That's that's useful data.  I wish we could make it fail more quickly
> on a smaller rsync, but the fact that you didn't need to reboot is
> definitely useful information.
>
> And this is a fresh rsync so no files were being deleted, rsync should
> have just been writing new files to .filename.XXXXX and then renaming
> the filename to filename.XXXXX when it is done, right?

That's what I'd guess. It was onto a clean filesystem, so there shouldn't 
be any deletions.

> OK, let me think about this a little.  I think we can create a patch
> which checks for writes to the block group descriptors and dumps a
> stack trace.  That would allow us catch the failing code in question
> in the act, and maybe figure out what is going on.

Ok.

Jeremy

-- 
Jeremy Sanders <jss@....cam.ac.uk>   http://www-xray.ast.cam.ac.uk/~jss/
X-Ray Group, Institute of Astronomy, University of Cambridge, UK.
Public Key Server PGP Key ID: E1AAE053
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