xprtrdma: Add ro_unmap_sync method for all-physical registration
physical's ro_unmap is synchronous already. The new ro_unmap_sync method just has to DMA unmap all MRs associated with the RPC request. Signed-off-by: NChuck Lever <chuck.lever@oracle.com> Tested-by: NDevesh Sharma <devesh.sharma@avagotech.com> Signed-off-by: NAnna Schumaker <Anna.Schumaker@Netapp.com>
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