linux-kernel - Re: [PATCH v7 10/13] dm-table: use bdev_is_zone_start helper in device_area_is

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Message-ID: <064551fa-4575-87cb-d9da-90a34309f634@opensource.wdc.com>
Date:   Wed, 15 Jun 2022 20:53:56 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Pankaj Raghav <p.raghav@...sung.com>, hch@....de,
        snitzer@...hat.com, axboe@...nel.dk
Cc:     bvanassche@....org, linux-kernel@...r.kernel.org,
        jiangbo.365@...edance.com, hare@...e.de, pankydev8@...il.com,
        dm-devel@...hat.com, jonathan.derrick@...ux.dev,
        gost.dev@...sung.com, dsterba@...e.com, jaegeuk@...nel.org,
        linux-nvme@...ts.infradead.org, Johannes.Thumshirn@....com,
        linux-block@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>
Subject: Re: [PATCH v7 10/13] dm-table: use bdev_is_zone_start helper in
 device_area_is_invalid()

On 6/15/22 19:19, Pankaj Raghav wrote:
> Use bdev_is_zone_start() helper that uses generic calculation to check
> for zone alignment instead of using po2 based alignment check.
> 
> Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
> Reviewed-by: Luis Chamberlain <mcgrof@...nel.org>
> ---
>  drivers/md/dm-table.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
> index bd539afbf..b553cdb6d 100644
> --- a/drivers/md/dm-table.c
> +++ b/drivers/md/dm-table.c
> @@ -251,7 +251,7 @@ 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 (blk_queue_is_zone_start(bdev_get_queue(bdev), start)) {

This is wrong. And you are changing this to the correct test in the next
patch.

>  			DMWARN("%s: start=%llu not aligned to h/w zone size %u of %pg",
>  			       dm_device_name(ti->table->md),
>  			       (unsigned long long)start,
> @@ -268,7 +268,7 @@ 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 (blk_queue_is_zone_start(bdev_get_queue(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,


-- 
Damien Le Moal
Western Digital Research