Use atomics for commands_outstanding instead of protecting with spin locks.
Signed-off-by: NDon Brace <don.brace@pmcs.com>
Signed-off-by: NStephen M. Cameron <stephenmcameron@gmail.com>
Reviewed-by: NJoe Handzik <joseph.t.handzik@hp.com>
Signed-off-by: NChristoph Hellwig <hch@lst.de>