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 <[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; >
Apart from Johannes's comment looks good. Reviewed-by: Chaitanya Kulkarni <[email protected]>
