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

[Bart Van Assche]

On 7/27/22 18:52, Damien Le Moal wrote:
> 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.

Zoned UFS devices will support ZBC and may have a zone size that is not 
a power of two.

Thanks,

Bart.