blk_queue_dma_drain  725 block/blk-settings.c EXPORT_SYMBOL_GPL(blk_queue_dma_drain);
blk_queue_dma_drain 1275 drivers/ata/libata-scsi.c 		blk_queue_dma_drain(q, atapi_drain_needed, buf, ATAPI_MAX_DRAIN);
blk_queue_dma_drain 1102 include/linux/blkdev.h extern int blk_queue_dma_drain(struct request_queue *q,