[SCSI] zfcp: Add zfcp private struct as SCSI device driver data

Add a new data structure zfcp_scsi_dev that holds zfcp private data
for each SCSI device. Use scsi_transport_reserve_device to let the
SCSI midlayer automatically allocate this with each SCSI device.

Reviewed-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

drivers/s390/scsi/zfcp_aux.c

@@ -159,6 +159,9 @@ static int __init zfcp_module_init(void)
 		fc_attach_transport(&zfcp_transport_functions);
 	if (!zfcp_data.scsi_transport_template)
 		goto out_transport;
+	scsi_transport_reserve_device(zfcp_data.scsi_transport_template,
+				      sizeof(struct zfcp_scsi_dev));
+
 
 	retval = misc_register(&zfcp_cfdc_misc);
 	if (retval) {