From: Asias He <asias@redhat.com>
To: Christoph Hellwig <hch@lst.de>
Cc: kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH V3 3/3] virtio-blk: Add bio-based IO path for virtio-blk
Date: Thu, 02 Aug 2012 14:28:16 +0800 [thread overview]
Message-ID: <501A1E00.2010605@redhat.com> (raw)
In-Reply-To: <20120730134424.GC6041@lst.de>
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
next prev parent reply other threads:[~2012-08-02 6:28 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-13 8:38 [PATCH V3 0/3] Improve virtio-blk performance Asias He
2012-07-13 8:38 ` [PATCH V3 1/3] block: Introduce __blk_segment_map_sg() helper Asias He
2012-07-13 8:38 ` [PATCH V3 2/3] block: Add blk_bio_map_sg() helper Asias He
2012-07-13 8:38 ` [PATCH V3 3/3] virtio-blk: Add bio-based IO path for virtio-blk Asias He
2012-07-27 0:33 ` Rusty Russell
2012-07-28 2:38 ` Asias He
2012-07-28 6:42 ` Paolo Bonzini
2012-07-30 4:43 ` Asias He
2012-07-30 7:31 ` Paolo Bonzini
2012-07-30 13:44 ` Christoph Hellwig
2012-08-02 6:28 ` Asias He [this message]
2012-07-30 13:43 ` Christoph Hellwig
2012-07-31 8:43 ` Asias He
2012-07-29 12:59 ` Michael S. Tsirkin
2012-07-30 0:26 ` Asias He
2012-07-27 6:29 ` Rusty Russell
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