xen-block: handle resize callback
Some frontend drivers will handle dynamic resizing of PV disks, so set up the BlockDevOps resize_cb() method during xen_block_realize() to allow this to be done. Signed-off-by: NPaul Durrant <paul.durrant@citrix.com> Reviewed-by: NAnthony PERARD <anthony.perard@citrix.com> Signed-off-by: NAnthony PERARD <anthony.perard@citrix.com>
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