On 6/24/22 08:25, Bart Van Assche wrote:
> Since it is nontrivial to figure out how blk_queue_zone_is_seq() and
> blk_rq_zone_is_seq() handle sequential write preferred zones, document
> this.
>
> Cc: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx>
Looks good.
Reviewed-by: Damien Le Moal <damien.lemoal@xxxxxxxxxxxxxxxxxx>
> ---
> include/linux/blk-mq.h | 7 +++++++
> include/linux/blkdev.h | 9 +++++++++
> 2 files changed, 16 insertions(+)
>
> diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
> index e2d9daf7e8dd..909d47e34b7c 100644
> --- a/include/linux/blk-mq.h
> +++ b/include/linux/blk-mq.h
> @@ -1124,6 +1124,13 @@ static inline unsigned int blk_rq_zone_no(struct request *rq)
> return blk_queue_zone_no(rq->q, blk_rq_pos(rq));
> }
>
> +/**
> + * blk_rq_zone_is_seq() - Whether a request is for a sequential zone.
> + * @rq: Request pointer.
> + *
> + * Return: true if and only if blk_rq_pos(@rq) refers either to a sequential
> + * write required or a sequential write preferred zone.
> + */
> static inline unsigned int blk_rq_zone_is_seq(struct request *rq)
> {
> return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq));
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 92b3bffad328..2904100d2485 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -688,6 +688,15 @@ static inline unsigned int blk_queue_zone_no(struct request_queue *q,
> return sector >> ilog2(q->limits.chunk_sectors);
> }
>
> +/**
> + * blk_queue_zone_is_seq() - Whether a logical block is in a sequential zone.
> + * @q: Request queue pointer.
> + * @sector: Offset from start of block device in 512 byte units.
> + *
> + * Return: true if and only if @q is associated with a zoned block device and
> + * @sector refers either to a sequential write required or a sequential write
> + * preferred zone.
> + */
> static inline bool blk_queue_zone_is_seq(struct request_queue *q,
> sector_t sector)
> {
--
Damien Le Moal
Western Digital Research
