linux-kernel - Re: [PATCH v3 0/2] Export max open zones and max active zones to sysfs

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Date:   Wed, 15 Jul 2020 14:26:47 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Niklas Cassel <niklas.cassel@....com>,
        Jonathan Corbet <corbet@....net>,
        Keith Busch <kbusch@...nel.org>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-block@...r.kernel.org, linux-nvme@...ts.infradead.org,
        linux-scsi@...r.kernel.org
Subject: Re: [PATCH v3 0/2] Export max open zones and max active zones to
 sysfs

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