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Subject: Re: [PATCH 0/2] null_blk: zone support
To:     loberman@redhat.com, axboe@fb.com
Cc:     linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
        Bart.VanAssche@wdc.com, Damien.LeMoal@wdc.com
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From:   =?UTF-8?Q?Matias_Bj=c3=b8rling?= <mb@lightnvm.io>
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Date:   Mon, 9 Jul 2018 09:54:57 +0200
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On 07/06/2018 07:45 PM, Laurence Oberman wrote:
> On Fri, 2018-07-06 at 19:38 +0200, Matias Bjørling wrote:
>> This series adds support for exposing a zone block device using the
>> null_blk device driver.
>>
>> The first patch moves core null_blk data structures to a shared
>> header
>> file. The second implements the actual zone support. The patchset
>> adds
>> two new options. One to enable the zone interface, and another to
>> define the size of the zones to expose.
>>
>> Thanks,
>> Matias
>>
>> Matias Bjørling (2):
>>    null_blk: move shared definitions to header file
>>    null_blk: add zone support
>>
>>   Documentation/block/null_blk.txt |   7 ++
>>   drivers/block/Makefile           |   5 +-
>>   drivers/block/null_blk.c         | 124 ++++++++++++-----------------
>> ---
>>   drivers/block/null_blk.h         | 108 ++++++++++++++++++++++++++++
>>   drivers/block/null_blk_zoned.c   | 149
>> +++++++++++++++++++++++++++++++++++++++
>>   5 files changed, 315 insertions(+), 78 deletions(-)
>>   create mode 100644 drivers/block/null_blk.h
>>   create mode 100644 drivers/block/null_blk_zoned.c
>>
> 
> Thank you for this will be very useful.
> I will test it to add value.
> I dont know the code well enough to review it
> Regards
> Laurence
> 

Great.

For fio, you can use the zone support here:

   https://github.com/bvanassche/fio

It is in the process of being upstreamed.

Also, you'll need the latest libzbc/util-linux (blkzone) if you want to 
report zones. A bug was fixed around detection of the drive.

   https://github.com/hgst/libzbc
   https://github.com/karelzak/util-linux