union v_atomic records_overrun; /* Number of overwritten records */
wait_queue_head_t read_wait; /* reader buffer-level wait queue */
wait_queue_head_t write_wait; /* writer buffer-level wait queue (for metadata only) */
union v_atomic records_overrun; /* Number of overwritten records */
wait_queue_head_t read_wait; /* reader buffer-level wait queue */
wait_queue_head_t write_wait; /* writer buffer-level wait queue (for metadata only) */