linux-kernel - Re: [PATCH v9 02/13] block:rearrange bdev_{is_zoned,zone_sectors,get

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Message-ID: <700a5080-aea2-1a56-6bac-bebb03be8b47@opensource.wdc.com>
Date:   Wed, 10 Aug 2022 09:50:11 -0700
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Pankaj Raghav <p.raghav@...sung.com>, Johannes.Thumshirn@....com,
        snitzer@...nel.org, axboe@...nel.dk, agk@...hat.com, hch@....de
Cc:     dm-devel@...hat.com, matias.bjorling@....com, gost.dev@...sung.com,
        linux-kernel@...r.kernel.org, pankydev8@...il.com,
        jaegeuk@...nel.org, hare@...e.de, linux-block@...r.kernel.org,
        linux-nvme@...ts.infradead.org, bvanassche@....org
Subject: Re: [PATCH v9 02/13] block:rearrange
 bdev_{is_zoned,zone_sectors,get_queue} helpers in blkdev.h

On 2022/08/03 2:47, Pankaj Raghav wrote:
> Define bdev_is_zoned(), bdev_zone_sectors() and bdev_get_queue() earlier
> in the blkdev.h include file.
> 
> This commit has no functional change, and it is a prep patch for allowing
> zoned devices with non-power-of-2 zone sizes in the block layer.
> 
> Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
> Suggested-by: Bart Van Assche <bvanassche@....org>
> ---
>  include/linux/blkdev.h | 48 +++++++++++++++++++++---------------------
>  1 file changed, 24 insertions(+), 24 deletions(-)
> 
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index ab82d1ff0cce..22f97427b60b 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -635,6 +635,11 @@ static inline bool queue_is_mq(struct request_queue *q)
>  	return q->mq_ops;
>  }
>  
> +static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
> +{
> +	return bdev->bd_queue;	/* this is never NULL */
> +}
> +
>  #ifdef CONFIG_PM
>  static inline enum rpm_status queue_rpm_status(struct request_queue *q)
>  {
> @@ -666,6 +671,25 @@ static inline bool blk_queue_is_zoned(struct request_queue *q)
>  	}
>  }
>  
> +static inline bool bdev_is_zoned(struct block_device *bdev)
> +{
> +	struct request_queue *q = bdev_get_queue(bdev);
> +
> +	if (q)
> +		return blk_queue_is_zoned(q);

As noted with the comment in bdev_get_queue(), q is never null. So this all
could be simplified to:

	return blk_queue_is_zoned(bdev_get_queue(bdev));

This could be done in a separate patch, or here as well.

> +
> +	return false;
> +}
> +
> +static inline sector_t bdev_zone_sectors(struct block_device *bdev)
> +{
> +	struct request_queue *q = bdev_get_queue(bdev);
> +
> +	if (!blk_queue_is_zoned(q))
> +		return 0;
> +	return q->limits.chunk_sectors;
> +}
> +
>  #ifdef CONFIG_BLK_DEV_ZONED
>  static inline unsigned int disk_nr_zones(struct gendisk *disk)
>  {
> @@ -892,11 +916,6 @@ int bio_poll(struct bio *bio, struct io_comp_batch *iob, unsigned int flags);
>  int iocb_bio_iopoll(struct kiocb *kiocb, struct io_comp_batch *iob,
>  			unsigned int flags);
>  
> -static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
> -{
> -	return bdev->bd_queue;	/* this is never NULL */
> -}
> -
>  /* Helper to convert BLK_ZONE_ZONE_XXX to its string format XXX */
>  const char *blk_zone_cond_str(enum blk_zone_cond zone_cond);
>  
> @@ -1296,25 +1315,6 @@ static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
>  	return BLK_ZONED_NONE;
>  }
>  
> -static inline bool bdev_is_zoned(struct block_device *bdev)
> -{
> -	struct request_queue *q = bdev_get_queue(bdev);
> -
> -	if (q)
> -		return blk_queue_is_zoned(q);
> -
> -	return false;
> -}
> -
> -static inline sector_t bdev_zone_sectors(struct block_device *bdev)
> -{
> -	struct request_queue *q = bdev_get_queue(bdev);
> -
> -	if (!blk_queue_is_zoned(q))
> -		return 0;
> -	return q->limits.chunk_sectors;
> -}
> -
>  static inline int queue_dma_alignment(const struct request_queue *q)
>  {
>  	return q ? q->dma_alignment : 511;


-- 
Damien Le Moal
Western Digital Research