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

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Date:   Fri, 17 Jun 2022 08:29:27 +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 6/16/22 18:55, Pankaj Raghav wrote:
> 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.
>>
> Yeah, I think I made a mistake while committing it. The next patch
> should only have the removing po2 condition check and these changes
> should have been only in this patch. I will fix it up!

This one and the next patch should be squashed together. They both deal
with non power of 2 zone size.


>>>  			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