linux-kernel - Re: [PATCH v8 08/11] dm-zone: use generic helpers to calculate offset from zone start

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Date:   Thu, 28 Jul 2022 12:20:28 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Pankaj Raghav <p.raghav@...sung.com>, hch@....de, axboe@...nel.dk,
        snitzer@...nel.org, Johannes.Thumshirn@....com
Cc:     matias.bjorling@....com, gost.dev@...sung.com,
        linux-kernel@...r.kernel.org, hare@...e.de,
        linux-block@...r.kernel.org, pankydev8@...il.com,
        bvanassche@....org, jaegeuk@...nel.org, dm-devel@...hat.com,
        linux-nvme@...ts.infradead.org,
        Luis Chamberlain <mcgrof@...nel.org>
Subject: Re: [PATCH v8 08/11] dm-zone: use generic helpers to calculate offset
 from zone start

On 7/28/22 01:22, Pankaj Raghav wrote:
> Use the bdev_offset_from_zone_start() helper function to calculate
> the offset from zone start instead of using power of 2 based
> calculation.
> 
> Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
> Reviewed-by: Luis Chamberlain <mcgrof@...nel.org>

Reviewed-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>

> ---
>  drivers/md/dm-zone.c | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/md/dm-zone.c b/drivers/md/dm-zone.c
> index 3dafc0e8b7a9..31c16aafdbfc 100644
> --- a/drivers/md/dm-zone.c
> +++ b/drivers/md/dm-zone.c
> @@ -390,7 +390,9 @@ static bool dm_zone_map_bio_begin(struct mapped_device *md,
>  	case REQ_OP_WRITE_ZEROES:
>  	case REQ_OP_WRITE:
>  		/* Writes must be aligned to the zone write pointer */
> -		if ((clone->bi_iter.bi_sector & (zsectors - 1)) != zwp_offset)
> +		if ((bdev_offset_from_zone_start(md->disk->part0,
> +						 clone->bi_iter.bi_sector)) != zwp_offset)
> +
>  			return false;
>  		break;
>  	case REQ_OP_ZONE_APPEND:
> @@ -602,11 +604,8 @@ void dm_zone_endio(struct dm_io *io, struct bio *clone)
>  		 */
>  		if (clone->bi_status == BLK_STS_OK &&
>  		    bio_op(clone) == REQ_OP_ZONE_APPEND) {
> -			sector_t mask =
> -				(sector_t)bdev_zone_sectors(disk->part0) - 1;
> -
>  			orig_bio->bi_iter.bi_sector +=
> -				clone->bi_iter.bi_sector & mask;
> +				bdev_offset_from_zone_start(disk->part0, clone->bi_iter.bi_sector);
>  		}
>  
>  		return;


-- 
Damien Le Moal
Western Digital Research