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Date: Thu, 26 Jun 2014 22:46:59 -0400
From: "Theodore Ts'o" <tytso@mit.edu>
To: Pavel Machek <pavel@ucw.cz>
Cc: kernel list <linux-kernel@vger.kernel.org>
Subject: Re: ext4: total breakdown on USB hdd, 3.0 kernel
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On Thu, Jun 26, 2014 at 10:30:52PM +0200, Pavel Machek wrote:
> 
> It looks like the filesystem contains _way_ too many 0xffff's:

That sounds like it's a hardware issue.  It may be that the controller
did something insane while trying to do a write at the point when the
disk drive was disconnected (and so the drive suffered a power drop).

> I saved beggining of the filesystem using cat /dev/sdc4 | gzip -9 - > /dev/sda3, but
> then ran out of patience. So there may be something for analysis, but...

The way to snapshot just the metadata blocks for analysis is:

e2image -r /dev/hdc4 | bzip2 > ~/hdc4.e2i.bz2

But in this case, it's I doubt it will be very helpful, because
fundamentally, this appears to be a hardware issue.

       	    	       	       	       - Ted
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