linux-kernel - Re: [PATCH v3] block: ublk: enable zoned storage support

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Date:   Wed, 28 Jun 2023 13:51:50 +0200
From:   "Andreas Hindborg (Samsung)" <nmi@...aspace.dk>
To:     Niklas Cassel <Niklas.Cassel@....com>
Cc:     "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        Hans Holmberg <Hans.Holmberg@....com>,
        Matias Bjørling <Matias.Bjorling@....com>,
        Minwoo Im <minwoo.im.dev@...il.com>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Jens Axboe <axboe@...nel.dk>, Ming Lei <ming.lei@...hat.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3] block: ublk: enable zoned storage support


Niklas Cassel <Niklas.Cassel@....com> writes:

> On Thu, Mar 16, 2023 at 03:55:38PM +0100, Andreas Hindborg wrote:
>> From: Andreas Hindborg <a.hindborg@...sung.com>
>
> Hello Andreas,
>
>
> I think that this patch is starting to look very nice!

Thanks!

>
>
<snip>
>> +
>> +int ublk_report_zones(struct gendisk *disk, sector_t sector,
>> +		      unsigned int nr_zones, report_zones_cb cb, void *data)
>> +{
>> +	unsigned int done_zones = 0;
>> +	struct ublk_device *ub = disk->private_data;
>> +	unsigned int zone_size_sectors = disk->queue->limits.chunk_sectors;
>> +	unsigned int first_zone = sector >> ilog2(zone_size_sectors);
>> +	struct blk_zone *buffer;
>> +	size_t buffer_length;
>> +	unsigned int max_zones_per_request;
>
> Nit: I would sort the variables differently.
>
> Perhaps:
>> +	struct ublk_device *ub = disk->private_data;
>> +	unsigned int zone_size_sectors = disk->queue->limits.chunk_sectors;
>> +	unsigned int first_zone = sector >> ilog2(zone_size_sectors);
>> +	unsigned int done_zones = 0;
>> +	unsigned int max_zones_per_request;
>> +	struct blk_zone *buffer;
>> +	size_t buffer_length;
>

Can I ask what is the reasoning behind this? I think they way you
propose looks better, but are there any rules one can follow for this?

Best regards
Andreas