[SCSI] zfcp: add queue_full sysfs attribute

Adds a new sysfs attribute queue_full for adapters that records the number
of incidents where a requests could not be submitted due to insufficient
free space on the request queue.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Martin Peschke <mp3@de.ibm.com>
Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index 67f45fc..74d7529 100644
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -568,6 +568,7 @@
 	struct fsf_qtcb_bottom_port *stats_reset_data;
 	unsigned long		stats_reset;
 	struct work_struct	scan_work;
+	atomic_t		qdio_outb_full;	   /* queue full incidents */
 };
 
 struct zfcp_port {