linux-kernel - Re: [PATCH 2/5] virtio_blk: implement REQ

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Date:	Mon, 16 Aug 2010 20:33:17 +0200
From:	Christoph Hellwig <hch@....de>
To:	Tejun Heo <tj@...nel.org>
Cc:	jaxboe@...ionio.com, linux-fsdevel@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	hch@....de, James.Bottomley@...e.de, tytso@....edu,
	chris.mason@...cle.com, swhiteho@...hat.com,
	konishi.ryusuke@....ntt.co.jp, dm-devel@...hat.com, vst@...b.net,
	jack@...e.cz, rwheeler@...hat.com, hare@...e.de, neilb@...e.de,
	rusty@...tcorp.com.au, mst@...hat.com, Tejun Heo <tj@...nle.org>
Subject: Re: [PATCH 2/5] virtio_blk: implement REQ_FLUSH/FUA support

On Mon, Aug 16, 2010 at 06:52:00PM +0200, Tejun Heo wrote:
> From: Tejun Heo <tj@...nle.org>
> 
> Remove now unused REQ_HARDBARRIER support and implement REQ_FLUSH/FUA
> support instead.  A new feature flag VIRTIO_BLK_F_FUA is added to
> indicate the support for FUA.

I'm not sure it's worth it.  The pure REQ_FLUSH path works not and is
well tested with kvm/qemu.   We can still easily add a FUA bit, and
even a pre-flush bit if the protocol roundtrips matter in real life
benchmarking.

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