From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay1.corp.sgi.com [137.38.102.111]) by oss.sgi.com (Postfix) with ESMTP id 58AAF7F5E for ; Thu, 14 Nov 2013 15:02:09 -0600 (CST) Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by relay1.corp.sgi.com (Postfix) with ESMTP id 37A358F8049 for ; Thu, 14 Nov 2013 13:02:09 -0800 (PST) Received: from ipmail07.adl2.internode.on.net (ipmail07.adl2.internode.on.net [150.101.137.131]) by cuda.sgi.com with ESMTP id 9Uu0jdaCG8JLOdum for ; Thu, 14 Nov 2013 13:02:04 -0800 (PST) Date: Fri, 15 Nov 2013 08:01:56 +1100 From: Dave Chinner Subject: Re: [PATCH RFC] xfs: set block device logical sector size on xfs_buftarg Message-ID: <20131114210156.GP6188@dastard> References: <5283C41D.7070503@redhat.com> <20131113185645.GA20869@infradead.org> <5283CE2E.2070702@sandeen.net> <20131113212658.GJ6188@dastard> <20131114133749.GA26268@infradead.org> <5284E484.6090001@sandeen.net> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <5284E484.6090001@sandeen.net> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Eric Sandeen Cc: Christoph Hellwig , Eric Sandeen , xfs-oss On Thu, Nov 14, 2013 at 08:56:04AM -0600, Eric Sandeen wrote: > On 11/14/13, 7:37 AM, Christoph Hellwig wrote: > > On Thu, Nov 14, 2013 at 08:26:58AM +1100, Dave Chinner wrote: > >> Seems like that's the avenue for improvement here to me. i.e. expose > >> the correct values to the guest so it's mkfs does the right thing. > >> Or, alternatively, make qemu buffer non-aligned/sized IOs itself > >> internally. > > > > I've implemented the support to expose these to the guest in qemu > > years ago. But the problem remains that this is information which > > needs to be attached to the image, which can't really work with raw > > images, and no one has bother to implement the support to store it > > for say qcow2. > > > > Ok but once again - this is not a guest mkfs issue. The reported > problem is that the guest cannot _boot_ in cache=none mode because > the bios attempts a 512-byte DIO. A different viewpoint: How can we make sure real 4k sector hardware works with Linux when it comes along if we can't emulate it via qemu + virtualisation? People often use qemu + virutalisation as a method of testing code for hardware they don't have access to, and this just seems like another of those things that we should have working in this environment long before real hardware comes along and requires it... Cheers, Dave. -- Dave Chinner david@fromorbit.com _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs