linux-kernel - Re: [PATCH v8 07/11] dm-zoned: ensure only power of 2 zone sizes are allowed

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Date:   Fri, 29 Jul 2022 10:00:53 +0200
From:   Pankaj Raghav <p.raghav@...sung.com>
To:     <dsterba@...e.cz>, <damien.lemoal@...nsource.wdc.com>,
        <hch@....de>, <axboe@...nel.dk>, <snitzer@...nel.org>,
        <Johannes.Thumshirn@....com>, <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 07/11] dm-zoned: ensure only power of 2 zone sizes
 are allowed

On 2022-07-28 14:15, David Sterba wrote:
> 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
Ok. I will rephrase based on Damien's comment and add the
zone_nr_sectors to be included. Thanks.
> 
>> +				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