scsi: iscsi: Add task completion helper

This adds a helper to detect if a cmd has completed but is not yet freed.

Link: https://lore.kernel.org/r/20210525181821.7617-2-michael.christie@oracle.com
Reviewed-by: Lee Duncan <lduncan@suse.com>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

include/scsi/libiscsi.h

@@ -145,6 +145,13 @@ static inline void* iscsi_next_hdr(struct iscsi_task *task)
 	return (void*)task->hdr + task->hdr_len;
 }
 
+static inline bool iscsi_task_is_completed(struct iscsi_task *task)
+{
+	return task->state == ISCSI_TASK_COMPLETED ||
+	       task->state == ISCSI_TASK_ABRT_TMF ||
+	       task->state == ISCSI_TASK_ABRT_SESS_RECOV;
+}
+
 /* Connection's states */
 enum {
 	ISCSI_CONN_INITIAL_STAGE,