linux-kernel - Re: [PATCH 12/16] zonefs: allow non power of 2 zoned devices

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Message-ID: <c490bd45-deab-8c2b-151c-c8db9f97e10c@samsung.com>
Date:   Thu, 28 Apr 2022 17:54:26 +0200
From:   Pankaj Raghav <p.raghav@...sung.com>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        <jaegeuk@...nel.org>, <axboe@...nel.dk>, <snitzer@...nel.org>,
        <hch@....de>, <mcgrof@...nel.org>, <naohiro.aota@....com>,
        <sagi@...mberg.me>, <dsterba@...e.com>,
        <johannes.thumshirn@....com>
CC:     <linux-kernel@...r.kernel.org>, <clm@...com>,
        <gost.dev@...sung.com>, <chao@...nel.org>, <josef@...icpanda.com>,
        <jonathan.derrick@...ux.dev>, <agk@...hat.com>,
        <kbusch@...nel.org>, <kch@...dia.com>,
        <linux-nvme@...ts.infradead.org>, <bvanassche@....org>,
        <jiangbo.365@...edance.com>, <linux-fsdevel@...r.kernel.org>,
        <matias.bjorling@....com>, <linux-block@...r.kernel.org>
Subject: Re: [PATCH 12/16] zonefs: allow non power of 2 zoned devices

On 2022-04-28 01:39, Damien Le Moal wrote:
> On 4/28/22 01:02, Pankaj Raghav wrote:
>> The zone size shift variable is useful only if the zone sizes are known
>> to be power of 2. Remove that variable and use generic helpers from
>> block layer to calculate zone index in zonefs
> 
> Period missing at the end of the sentence.
> 
Ack
> What about zonefs-tools and its test suite ? Is everything still OK on
> that front ? I suspect not...
> 
I don't know why you assume that :). Zonefs had only one place that had
the assumption of po2 zsze sectors:
if (nr_zones < dev.nr_zones) {
	size_t runt_sectors = dev.capacity & (dev.zone_nr_sectors - 1);

In my local tree I changed it and I was able to run zonefs tests for non
po2 zone device. I have also mentioned it in my cover letter:
```
ZoneFS:
zonefs-tests.sh from zonefs-tools were run with no failures.
```
I will make sure to add my private tree for zonefs in my cover letter in
the next rev. But even without that change, a typical emulated npo2
device should work fine because the changes are applicable only for
"runt" zones.