[PATCH 14/16] block: switch polling to be bio based

[Pankaj Raghav]

On Tue, Oct 12, 2021 at 01:12:24PM +0200, Christoph Hellwig wrote:
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index 2b80c98fc373e..2a8689e949b4c 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -25,6 +25,7 @@ struct request;
>  struct sg_io_hdr;
>  struct blkcg_gq;
>  struct blk_flush_queue;
> +struct kiocb;
>  struct pr_ops;
>  struct rq_qos;
>  struct blk_queue_stats;
> @@ -550,7 +551,7 @@ static inline unsigned int blk_queue_depth(struct request_queue *q)
>  
>  extern int blk_register_queue(struct gendisk *disk);
>  extern void blk_unregister_queue(struct gendisk *disk);
> -blk_qc_t submit_bio_noacct(struct bio *bio);
> +void submit_bio_noacct(struct bio *bio);
>  
>  extern int blk_lld_busy(struct request_queue *q);
>  extern void blk_queue_split(struct bio **);
> @@ -568,7 +569,8 @@ blk_status_t errno_to_blk_status(int errno);
>  #define BLK_POLL_ONESHOT		(1 << 0)
>  /* do not sleep to wait for the expected completion time */
>  #define BLK_POLL_NOSLEEP		(1 << 1)
Minor comment: Could we also have a flag #define BLK_POLL_SPIN 0?
It can improve the readability from the caller side instead of having
just a 0 to indicate spinning.

Regards, 
Pankaj Raghav