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Date:   Thu, 28 Jul 2022 14:15:48 +0200
From:   David Sterba <dsterba@suse.cz>
To:     Pankaj Raghav <p.raghav@samsung.com>
Cc:     damien.lemoal@opensource.wdc.com, hch@lst.de, axboe@kernel.dk,
        snitzer@kernel.org, Johannes.Thumshirn@wdc.com,
        matias.bjorling@wdc.com, gost.dev@samsung.com,
        linux-kernel@vger.kernel.org, hare@suse.de,
        linux-block@vger.kernel.org, pankydev8@gmail.com,
        bvanassche@acm.org, jaegeuk@kernel.org, dm-devel@redhat.com,
        linux-nvme@lists.infradead.org,
        Luis Chamberlain <mcgrof@kernel.org>
Subject: Re: [PATCH v8 07/11] dm-zoned: ensure only power of 2 zone sizes are
 allowed
Message-ID: <20220728121548.GE13489@twin.jikos.cz>
Reply-To: dsterba@suse.cz
Mail-Followup-To: dsterba@suse.cz, Pankaj Raghav <p.raghav@samsung.com>,
        damien.lemoal@opensource.wdc.com, hch@lst.de, axboe@kernel.dk,
        snitzer@kernel.org, Johannes.Thumshirn@wdc.com,
        matias.bjorling@wdc.com, gost.dev@samsung.com,
        linux-kernel@vger.kernel.org, hare@suse.de,
        linux-block@vger.kernel.org, pankydev8@gmail.com,
        bvanassche@acm.org, jaegeuk@kernel.org, dm-devel@redhat.com,
        linux-nvme@lists.infradead.org,
        Luis Chamberlain <mcgrof@kernel.org>
References: <20220727162245.209794-1-p.raghav@samsung.com>
 <CGME20220727162253eucas1p1a5912e0494f6918504cc8ff15ad5d31f@eucas1p1.samsung.com>
 <20220727162245.209794-8-p.raghav@samsung.com>
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On Wed, Jul 27, 2022 at 06:22:41PM +0200, Pankaj Raghav wrote:
> --- a/drivers/md/dm-zoned-target.c
> +++ b/drivers/md/dm-zoned-target.c
> @@ -792,6 +792,10 @@ static int dmz_fixup_devices(struct dm_target *ti)
>  				return -EINVAL;
>  			}
>  			zone_nr_sectors = bdev_zone_sectors(bdev);
> +			if (!is_power_of_2(zone_nr_sectors)) {
> +				ti->error = "Zone size is not power of 2";

This could print what's the value of zone_nr_sectors

> +				return -EINVAL;
> +			}
>  			zoned_dev->zone_nr_sectors = zone_nr_sectors;
>  			zoned_dev->nr_zones = bdev_nr_zones(bdev);
>  		}
> @@ -804,6 +808,10 @@ static int dmz_fixup_devices(struct dm_target *ti)
>  			return -EINVAL;
>  		}
>  		zoned_dev->zone_nr_sectors = bdev_zone_sectors(bdev);
> +		if (!is_power_of_2(zoned_dev->zone_nr_sectors)) {
> +			ti->error = "Zone size is not power of 2";

Same

> +			return -EINVAL;
> +		}
>  		zoned_dev->nr_zones = bdev_nr_zones(bdev);
>  	}
>  
> -- 
> 2.25.1