From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Feature request: e2fsck -z
Date: Tue, 09 Aug 2011 12:52:20 -0500
Message-ID: <4E4173D4.9010104@zytor.com>
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To: linux-ext4@vger.kernel.org
Sender: linux-ext4-owner@vger.kernel.org

Hi all,

This is something I've wanted to see for a very long time, and it
finally occurred to me that perhaps I should say something about it!

It would be a very nice thing to have a flag to e2fsck, presumably -z,
to zero out any unused data blocks, inodes and so on.  The goal is to
minimize the amount of space required after compressing a virtual disk
image or similar, and to make sure any non-data isn't lying around.

	-hpa