linux-kernel - Re: [PATCH v8 00/11] support non power of 2 zoned device

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Date:   Thu, 28 Jul 2022 10:52:22 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     Bart Van Assche <bvanassche@....org>,
        Pankaj Raghav <p.raghav@...sung.com>, hch@....de,
        axboe@...nel.dk, snitzer@...nel.org, Johannes.Thumshirn@....com
Cc:     matias.bjorling@....com, gost.dev@...sung.com,
        linux-kernel@...r.kernel.org, hare@...e.de,
        linux-block@...r.kernel.org, pankydev8@...il.com,
        jaegeuk@...nel.org, dm-devel@...hat.com,
        linux-nvme@...ts.infradead.org
Subject: Re: [PATCH v8 00/11] support non power of 2 zoned device

On 7/28/22 08:19, Bart Van Assche wrote:
> On 7/27/22 09:22, Pankaj Raghav wrote:
>> This series adds support to npo2 zoned devices in the block and nvme
>> layer and a new **dm target** is added: dm-po2z-target. This new
>> target will be initially used for filesystems such as btrfs and
>> f2fs that does not have native npo2 zone support.
> 
> Should any SCSI changes be included in this patch series? From sd_zbc.c:
> 
> 	if (!is_power_of_2(zone_blocks)) {
> 		sd_printk(KERN_ERR, sdkp,
> 			  "Zone size %llu is not a power of two.\n",
> 			  zone_blocks);
> 		return -EINVAL;
> 	}

There are no non-power of 2 SMR drives on the market and no plans to have
any as far as I know. Users want power of 2 zone size. So I think it is
better to leave sd_zbc & scsi_debug as is for now.

> 
> Thanks,
> 
> Bart.


-- 
Damien Le Moal
Western Digital Research