Rusty Russell wrote: > Example block driver using virtio. > > The block driver uses outbufs with sg[0] being the request information > (struct virtio_blk_outhdr) with the type, sector and inbuf id. For a > write, the rest of the sg will contain the data to be written. > > The first segment of the inbuf is a result code (struct > virtio_blk_inhdr). For a read, the rest of the sg points to the input > buffer. > > TODO: > 1) Ordered tag support. Implementing a do_request function has quite a few disadvantages over hooking into q->make_request_fn. This way, we have the device plug (latency), request merging, and I/O scheduling inside the guest. It seems preferable to do that in the host, especially when requests of multiple guests end up on the same physical media (shared access, or partitioned).
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