From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: [PATCH, RFC] xfs: batched discard support Date: Sun, 16 Aug 2009 09:53:15 -0400 Message-ID: <20090816135315.GA25251@infradead.org> References: <20090816004705.GA7347@infradead.org> <4A876255.10606@rtr.ca> <4A876CA9.20906@rtr.ca> <20090816022500.GA12392@infradead.org> <4A8802F3.6010908@rtr.ca> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Christoph Hellwig , linux-fsdevel@vger.kernel.org, jens.axboe@oracle.com, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, xfs@oss.sgi.com To: Mark Lord Return-path: Received: from bombadil.infradead.org ([18.85.46.34]:36815 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751164AbZHPNxP (ORCPT ); Sun, 16 Aug 2009 09:53:15 -0400 Content-Disposition: inline In-Reply-To: <4A8802F3.6010908@rtr.ca> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Sun, Aug 16, 2009 at 09:00:35AM -0400, Mark Lord wrote: > Okay, this gives me ENOSYS now --> discard/trim support is missing from > the lower layers. ENOSYS or EOPNOTSUPP? > What other patches do I need to make this work? > > The latest from Matthew's discard tree (May 2009) don't appear to be sufficient, > even after updating them for 2.6.31-rc6. Hmm. That was kinda the reason why I didn't want to post stuff yet. In current mainline only MTD implements the prepare_discard_fn, and we'll need it implemented and working. I think Matthews patches should be sufficient, unless they have some ATA revision check to not issue the TRIM for your device.