linux-ext4 - Re: zero out blocks of freed user data for operation a virtual machine environment

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Message-ID: <20090524173933.GD24753@cip.informatik.uni-erlangen.de>
Date:	Sun, 24 May 2009 19:39:33 +0200
From:	Thomas Glanzmann <thomas@...nzmann.de>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	tytso@...nk.org, LKML <linux-kernel@...r.kernel.org>,
	linux-ext4@...r.kernel.org
Subject: Re: zero out blocks of freed user data for operation a virtual
	machine environment

Hello,

> > tunable feature that zeroes our free data

> wouldn't it be better if the VM's would just support the TRIM command?

the resources available to me indicate that the TRIM command is a not
yet standarized command targeted at SSD disks to indicate free disk
space. Does ext3/4 trigger a block device layer call that could result
in a TRIM command?

        Thomas
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