linux-kernel - Re: [PATCH V3 3/3] virtio-blk: Add bio-based IO path for virtio-blk

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Message-ID: <501A1E00.2010605@redhat.com>
Date:	Thu, 02 Aug 2012 14:28:16 +0800
From:	Asias He <asias@...hat.com>
To:	Christoph Hellwig <hch@....de>
CC:	Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH V3 3/3] virtio-blk: Add bio-based IO path for virtio-blk

On 07/30/2012 09:44 PM, Christoph Hellwig wrote:
> On Mon, Jul 30, 2012 at 09:31:06AM +0200, Paolo Bonzini wrote:
>> You only need to add REQ_FLUSH support.  The virtio-blk protocol does
>> not support REQ_FUA, because there's no easy way to do it in userspace.
>
> A bio-based driver needs to handle both REQ_FLUSH and REQ_FUA as it does
> not get the sequencing of REQ_FUA into REQ_FLUSH that request based drivers
> can request.  To what the REQ_FUA request gets translated is a different story.

I just sent out V5 to support both REQ_FLUSH AND REQ_FUA.
Thanks, Christoph!

-- 
Asias
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