Re: [PATCH 0/8] Zone management commands support

[Damien Le Moal <Damien.LeMoal@wdc.com>]

On 2019/11/02 4:01, Jens Axboe wrote:
> On 10/27/19 8:05 AM, Damien Le Moal wrote:
>> This series implements a few improvements and cleanups to zone block
>> device zone reset operations with the first three patches.
>>
>> The remaining of the series patches introduce zone open, close and
>> finish support, allowing users of zoned block devices to explicitly
>> control the condition (state) of zones.
>>
>> While these operations are not stricktly necessary for the correct
>> operation of zoned block devices, the open and close operations can
>> improve performance for some device implementations of the ZBC and ZAC
>> standards under write workloads. The finish zone operation, which
>> transition a zone to the full state, can also be useful to protect a
>> zone data by preventing further zone writes.
>>
>> These operations are implemented by introducing the new
>> REQ_OP_ZONE_OPEN, REQ_OP_ZONE_CLOSE and REQ_OP_ZONE_FINISH request codes
>> and the function blkdev_zone_mgmt() to issue these requests. This new
>> function also replaces the former blkdev_reset_zones() function to reset
>> zones write pointer.
>>
>> The new ioctls BLKOPENZONE, BLKCLOSEZONE and BLKFINISHZONE are also
>> defined to allow applications to issue these new requests without
>> resorting to a device passthrough interface (e.g. SG_IO).
>>
>> Support for these operations is added to the SCSI sd driver, to the dm
>> infrastructure (dm-linear and dm-flakey targets) and to the null_blk
>> driver.
> 
> Can patch 3 go in separately, doesn't look like we need it in this
> series?

Yes, I think it can go in now in 5.4-rc if Martin is willing to take it.
That will create a small conflict in your tree for patch 6 though.

Martin,

Can you take patch 3 now ?

> 
> Also need the DM folks to review/sign off on patch 7. Mike?
> 


-- 
Damien Le Moal
Western Digital Research