linux-kernel - Re: [PATCH v9 03/13] block: allow blk-zoned devices to have non-power-of-2 zone size

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Date:   Thu, 11 Aug 2022 15:13:31 +0200
From:   Pankaj Raghav <p.raghav@...sung.com>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.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>, Luis Chamberlain <mcgrof@...nel.org>
Subject: Re: [PATCH v9 03/13] block: allow blk-zoned devices to have
 non-power-of-2 zone size

>>  static inline bool disk_zone_is_seq(struct gendisk *disk, sector_t sector)
>>  {
>>  	if (!blk_queue_is_zoned(disk->queue))
>> @@ -753,6 +777,12 @@ static inline unsigned int disk_zone_no(struct gendisk *disk, sector_t sector)
>>  {
>>  	return 0;
>>  }
>> +
>> +static inline bool bdev_is_zone_start(struct block_device *bdev, sector_t sec)
>> +{
>> +	return false;
>> +}
> 
> Is this one really necessary ? Any caller of this would also depend on
> CONFIG_BLK_DEV_ZONED and not compiled if not enabled. So there should be no
> callers of this for the !CONFIG_BLK_DEV_ZONED case.
> 
We are using it in dm-table.c in device_area_is_invalid() function. So
it can be called without being compiled with CONFIG_BLK_DEV_ZONED like
bdev_is_zoned() in dm-table.c.
>> +
>>  static inline unsigned int bdev_max_open_zones(struct block_device *bdev)
>>  {
>>  	return 0;
> 
>