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SubjectRe: [PATCH V3 3/3] virtio-blk: Add bio-based IO path for virtio-blk
Il 30/07/2012 06:43, Asias He ha scritto:
>>
>
> Yes. Something like this:
>
> qemu -drive file=foo.img,cache=writeback/unsafe
>
> is not safe against power losses also?

cache=writeback and cache=none are safe, cache=unsafe isn't.

> I think we can add REQ_FLUSH & REQ_FUA support to bio path and that
> deserves another patch.

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.

Paolo


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