From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id n7K1dMqj241989 for ; Wed, 19 Aug 2009 20:39:32 -0500 Received: from mail.rtr.ca (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 293A53E3FA9 for ; Wed, 19 Aug 2009 18:40:04 -0700 (PDT) Received: from mail.rtr.ca (rtr.ca [76.10.145.34]) by cuda.sgi.com with ESMTP id Eq7wvFJ4TDYjzqzg for ; Wed, 19 Aug 2009 18:40:04 -0700 (PDT) Message-ID: <4A8CA956.2060406@rtr.ca> Date: Wed, 19 Aug 2009 21:39:34 -0400 From: Mark Lord MIME-Version: 1.0 Subject: Re: [PATCH, RFC] xfs: batched discard support References: <20090816004705.GA7347@infradead.org> <20090819203916.GA25296@elte.hu> In-Reply-To: <20090819203916.GA25296@elte.hu> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Ingo Molnar Cc: Peter Zijlstra , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, xfs@oss.sgi.com, Christoph Hellwig , IDE/ATA development list , Paul Mackerras , jens.axboe@oracle.com, linux-fsdevel@vger.kernel.org, Linus Torvalds [resending, after fixing the Cc: list; somebody trimmed it earlier] Jamie Lokier wrote: .. > I don't remember - does TRIM guarantee the blocks read zeros afterwards? .. No, it doesn't. A drive can optionally support "deterministic TRIM", whereby it will return consistent data for any given trimmed sector afterwards, but that doesn't mean zeros. -ml _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs