Messages in this thread | | | Date | Mon, 30 Jul 2012 15:44:24 +0200 | From | Christoph Hellwig <> | Subject | Re: [PATCH V3 3/3] virtio-blk: Add bio-based IO path for virtio-blk |
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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.
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