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 <hch@xxxxxx>
---
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
