From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kara Subject: Re: [RFC] relaxed barrier semantics Date: Mon, 2 Aug 2010 15:14:29 +0200 Message-ID: <20100802131429.GE3278@quack.suse.cz> References: <25F5E16E-968D-4FEF-8187-70453985B19B@dilger.ca> <20100729230406.GI4506@thunk.org> <4C52CBFF.6090406@vlnb.net> <20100730130957.GA26894@lst.de> <4C52D2E0.5000609@vlnb.net> <20100730133410.GA27996@lst.de> <4C52D728.6070008@vlnb.net> <20100730142025.GA29341@lst.de> <20100731004756.GC3273@quack.suse.cz> <20100731091245.GA4643@lst.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Jan Kara , Vladislav Bolkhovitin , Ted Ts'o , Andreas Dilger , Ric Wheeler , Tejun Heo , Vivek Goyal , jaxboe@fusionio.com, James.Bottomley@suse.de, linux-fsdevel@vger.kernel.org, linux-scsi@vger.kernel.org, chris.mason@oracle.com, swhiteho@redhat.com, konishi.ryusuke@lab.ntt.co.jp To: Christoph Hellwig Return-path: Received: from cantor.suse.de ([195.135.220.2]:35770 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751452Ab0HBNO7 (ORCPT ); Mon, 2 Aug 2010 09:14:59 -0400 Content-Disposition: inline In-Reply-To: <20100731091245.GA4643@lst.de> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Sat 31-07-10 11:12:46, Christoph Hellwig wrote: > On Sat, Jul 31, 2010 at 02:47:57AM +0200, Jan Kara wrote: > > > There is a few caes where we could do that - the fsync without metadata > > > changes above would be the prime example. But there's a lot lower > > > hanging fruit until we get to the point where it's worth trying. > > Umm, I don't understand you. I think that fsync in particular is an > > example where you have to wait and issue cache flush if the drive has > > volatile write cache. > > Of course. What makes you believe anyone said something else? Ok, then I just misunderstood which requests you wanted to send ORDERED. Never mind, I think we agree on what needs to / can be done. Honza -- Jan Kara SUSE Labs, CR