scsi_dh: kill struct scsi_dh_data

Add a ->handler and a ->handler_data field to struct scsi_device and kill
this indirection.  Also move struct scsi_device_handler to scsi_dh.h so that
changes to it don't require rebuilding every SCSI LLDD.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: James Bottomley <JBottomley@Odin.com>

diff --cc drivers/scsi/device_handler/scsi_dh_alua.c
Simple merge

diff --cc drivers/scsi/device_handler/scsi_dh_emc.c
Simple merge

diff --cc drivers/scsi/device_handler/scsi_dh_hp_sw.c
Simple merge

diff --cc drivers/scsi/device_handler/scsi_dh_rdac.c
Simple merge

diff --cc drivers/scsi/scsi_dh.c
Simple merge

diff --cc drivers/scsi/scsi_error.c
Simple merge

diff --cc drivers/scsi/scsi_lib.c
Simple merge

diff --cc include/scsi/scsi_device.h
Simple merge

diff --cc include/scsi/scsi_dh.h
Simple merge