Paolo Bonzini 20af3cfd20
virtio-blk: use virtqueue_add_sgs on req path ...
(This is a respin of Paolo Bonzini's patch, but it calls
virtqueue_add_sgs() instead of his multi-part API).
This is similar to the previous patch, but a bit more radical
because the bio and req paths now share the buffer construction
code. Because the req path doesn't use vbr->sg, however, we
need to add a couple of arguments to __virtblk_add_req.
We also need to teach __virtblk_add_req how to build SCSI command
requests.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com >
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au >
Reviewed-by: Asias He <asias@redhat.com >
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