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Subject: Re: [PATCH v3 0/2] Export max open zones and max active zones to
 sysfs
To:     Niklas Cassel <niklas.cassel@wdc.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Keith Busch <kbusch@kernel.org>,
        Christoph Hellwig <hch@lst.de>,
        Sagi Grimberg <sagi@grimberg.me>,
        "James E.J. Bottomley" <jejb@linux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>
Cc:     linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
        linux-block@vger.kernel.org, linux-nvme@lists.infradead.org,
        linux-scsi@vger.kernel.org
References: <20200714211824.759224-1-niklas.cassel@wdc.com>
From:   Jens Axboe <axboe@kernel.dk>
Message-ID: <58eac7f6-ab09-7f96-eb02-a19e8153e89a@kernel.dk>
Date:   Wed, 15 Jul 2020 14:26:47 -0600
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On 7/14/20 3:18 PM, Niklas Cassel wrote:
> Export max open zones and max active zones to sysfs.
> 
> This patch series in based on Jens's linux-block/for-next branch.
> 
> All zoned block devices in the kernel utilize the "zoned block device
> support" (CONFIG_BLK_DEV_ZONED).
> 
> The Zoned Namespace Command Set Specification defines two different
> resource limits: Max Open Resources and Max Active Resources.
> 
> The ZAC and ZBC standards define a MAXIMUM NUMBER OF OPEN SEQUENTIAL WRITE
> REQUIRED ZONES field.
> 
> 
> Since the ZNS Max Open Resources field has the same purpose as the ZAC/ZBC
> field, (the ZNS field is 0's based, the ZAC/ZBC field isn't), create a
> common "max_open_zones" definition in the sysfs documentation, and export
> both the ZNS field and the ZAC/ZBC field according to this new common
> definition.
> 
> The ZNS Max Active Resources field does not have an equivalent field in
> ZAC/ZBC, however, since both ZAC/ZBC and ZNS utilize the "zoned block
> device support" in the kernel, create a "max_active_zones" definition in
> the sysfs documentation, similar to "max_open_zones", and export it
> according to this new definition. For ZAC/ZBC devices, this field will be
> exported as 0, meaning "no limit".

Applied, thanks.

-- 
Jens Axboe