xen_disk: use a single entry iovec
Since xen_disk now always copies data to and from a guest there is no need to maintain a vector entry corresponding to every page of a request. This means there is less per-request state to maintain so the ioreq structure can shrink significantly. Signed-off-by: NPaul Durrant <paul.durrant@citrix.com> Acked-by: NAnthony Perard <anthony.perard@citrix.com> Signed-off-by: NStefano Stabellini <sstabellini@kernel.org>
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