From: Lukas Czerner <lczerner@redhat.com>
Subject: Re: Feature request: e2fsck -z
Date: Wed, 10 Aug 2011 13:01:10 +0200 (CEST)
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Cc: Lukas Czerner <lczerner@redhat.com>,
	Ric Wheeler <ricwheeler@gmail.com>,
	Andreas Dilger <adilger@whamcloud.com>,
	"H. Peter Anvin" <hpa@zytor.com>, linux-ext4@vger.kernel.org
To: Florian Weimer <fweimer@bfk.de>
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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.

Thanks!
-Lukas