From: Thomas Glanzmann Subject: Re: zero out blocks of freed user data for operation a virtual machine environment Date: Sun, 24 May 2009 19:39:33 +0200 Message-ID: <20090524173933.GD24753@cip.informatik.uni-erlangen.de> References: <20090524170045.GC24753@cip.informatik.uni-erlangen.de> <20090524101551.57b706e9@infradead.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: tytso@thunk.org, LKML , linux-ext4@vger.kernel.org To: Arjan van de Ven Return-path: Received: from faui03.informatik.uni-erlangen.de ([131.188.30.103]:48065 "EHLO faui03.informatik.uni-erlangen.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753655AbZEXRjd (ORCPT ); Sun, 24 May 2009 13:39:33 -0400 Content-Disposition: inline In-Reply-To: <20090524101551.57b706e9@infradead.org> Sender: linux-ext4-owner@vger.kernel.org List-ID: 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