In a lot of places we want to know the DMA direction for a given struct request. Add a little helper to make it a littler easier.
Signed-off-by: Christoph Hellwig <[email protected]> --- include/linux/blkdev.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index f9a072610d28..5279104527ad 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -638,6 +638,9 @@ static inline bool blk_account_rq(struct request *rq) #define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ) +#define rq_dma_dir(rq) \ + (op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE) + static inline bool queue_is_mq(struct request_queue *q) { return q->mq_ops; -- 2.20.1
