On 3/21/19 4:11 PM, Christoph Hellwig wrote:
> 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;
>
Apart from Johannes's comment looks good.
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@xxxxxxx>
