linux-kernel - Re: [PATCH v9 10/13] dm-table: allow zoned devices with non power-of-2 zone sizes

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Date:   Wed, 10 Aug 2022 10:12:19 -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 10/13] dm-table: allow zoned devices with non
 power-of-2 zone sizes

On 2022/08/03 2:47, Pankaj Raghav wrote:
> Allow dm to support zoned devices with non power-of-2(po2) zone sizes as
> the block layer now supports it.
> 
> Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>

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

> ---
>  drivers/md/dm-table.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
> index 332f96b58252..31eb1d29d136 100644
> --- a/drivers/md/dm-table.c
> +++ b/drivers/md/dm-table.c
> @@ -250,7 +250,7 @@ static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev,
>  	if (bdev_is_zoned(bdev)) {
>  		unsigned int zone_sectors = bdev_zone_sectors(bdev);
>  
> -		if (start & (zone_sectors - 1)) {
> +		if (!bdev_is_zone_start(bdev, start)) {
>  			DMWARN("%s: start=%llu not aligned to h/w zone size %u of %pg",
>  			       dm_device_name(ti->table->md),
>  			       (unsigned long long)start,
> @@ -267,7 +267,7 @@ static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev,
>  		 * devices do not end up with a smaller zone in the middle of
>  		 * the sector range.
>  		 */
> -		if (len & (zone_sectors - 1)) {
> +		if (!bdev_is_zone_start(bdev, len)) {
>  			DMWARN("%s: len=%llu not aligned to h/w zone size %u of %pg",
>  			       dm_device_name(ti->table->md),
>  			       (unsigned long long)len,
> @@ -1642,8 +1642,7 @@ static int validate_hardware_zoned_model(struct dm_table *t,
>  		return -EINVAL;
>  	}
>  
> -	/* Check zone size validity and compatibility */
> -	if (!zone_sectors || !is_power_of_2(zone_sectors))
> +	if (!zone_sectors)
>  		return -EINVAL;
>  
>  	if (dm_table_any_dev_attr(t, device_not_matches_zone_sectors, &zone_sectors)) {


-- 
Damien Le Moal
Western Digital Research