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Date:	Wed, 10 Aug 2011 13:09:47 +0200 (CEST)
From:	Lukas Czerner <lczerner@...hat.com>
To:	Florian Weimer <fweimer@....de>
cc:	Lukas Czerner <lczerner@...hat.com>,
	Ric Wheeler <ricwheeler@...il.com>,
	Andreas Dilger <adilger@...mcloud.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-ext4@...r.kernel.org
Subject: Re: Feature request: e2fsck -z

On Wed, 10 Aug 2011, Florian Weimer wrote:

> * Lukas Czerner:
> 
> > On Wed, 10 Aug 2011, Florian Weimer wrote:
> >
> >> * Lukas Czerner:
> >> 
> >> > You're right. It is a part of e2fsck and you can enable it with -E
> >> > discard.
> >> 
> >> If the block device does not support TRIM, does this result in zeros
> >> being written instead?
> 
> > Of course not, discard works only on devices which does support it. If
> > the device does not support discard it will to nothing.
> 
> Oh, then it doesn't address hpa's use case (improving compression).
> 

It does if he will use SSD's with "discard_zeroes_data" capability. But
my original answer was to simply confirm that e2fsck has that feature.

Thanks!
-Lukas
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