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Following in the steps of patch: "xen: Union the blkif_request request specific fields" this patch changes the blkback. Per the original patch: "Prepare for extending the block device ring to allow request specific fields, by moving the request specific fields for reads, writes and barrier requests to a union member." Cc: Owen Smith <owen.smith@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>