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From: Damien Le Moal <>
To: Jens Axboe <>,
	"" <>,
	"" <>,
	"Martin K . Petersen" <>,
	"" <>,
	Mike Snitzer <>,
	Jaegeuk Kim <>, Chao Yu <>
Subject: Re: [PATCH v2 0/9] Zoned block device enhancements and zone report rework
Date: Wed, 13 Nov 2019 02:40:39 +0000
Message-ID: <> (raw)
In-Reply-To: <>

On 2019/11/13 11:16, Jens Axboe wrote:
> On 11/10/19 6:39 PM, Damien Le Moal wrote:
>> This series of patches introduces changes to zoned block device handling
>> code with the intent to simplify the code while optimizing run-time
>> operation, particularly in the area of zone reporting.
>> The first patch lifts the device zone check code out of the sd driver
>> and reimplements these zone checks generically as part of
>> blk_revalidate_disk_zones(). This avoids zoned block device drivers to
>> have to implement these checks. The second patch simplifies this
>> function code for the !zoned case.
>> The third patch is a small cleanup of zone report processing in
>> preparation for the fourth patch which removes support for partitions
>> on zoned block devices. As mentioned in that patch commit message, none
>> of the known partitioning tools support zoned devices and there are no
>> known use case in the field of SMR disks being used with partitions.
>> Dropping partition supports allows to significantly simplify the code
>> for zone report as zone sector values remapping becomes unnecessary.
>> Patch 5 to 6 are small cleanups and fixes of the null_blk driver zoned
>> mode.
>> The prep patch 7 optimizes zone report buffer allocation for the SCSI
>> sd driver. Finally, patch 8 introduces a new interface for report zones
>> handling using a callback function executed per zone reported by the
>> device. This allows avoiding the need to allocate large arrays of
>> blk_zone structures for the execution of zone reports. This can
>> significantly reduce memory usage and pressure on the memory management
>> system while significantly simplify the code all over.
>> Overall, this series not only reduces significantly the code size, it
>> also improves run-time memory usage for zone report execution.
>> This series applies cleanly on the for-next block tree on top of the
>> zone management operation series. It may however create a conflict with
>> Christoph's reqork of disk size revalidation. Please consider this
>> series for inclusion in the 5.5 kernel.
> We're taking branching to new levels... I created for-5.5/zoned for this,
> which is for-5.5/block + for-5.5/drivers + for-5.5/drivers-post combined.
> The latter is a branch with the SCSI dependencies from Martin pulled in.


Thanks !

Damien Le Moal
Western Digital Research

  reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-11  2:39 Damien Le Moal
2019-11-11  2:39 ` [PATCH v2 1/9] block: Enhance blk_revalidate_disk_zones() Damien Le Moal
2019-11-11  2:39 ` [PATCH v2 2/9] block: cleanup the !zoned case in blk_revalidate_disk_zones Damien Le Moal
2019-11-11  2:39 ` [PATCH v2 3/9] block: Simplify report zones execution Damien Le Moal
2019-11-11  2:39 ` [PATCH v2 4/9] block: Remove partition support for zoned block devices Damien Le Moal
2019-11-11  6:55   ` Hannes Reinecke
2019-11-11  2:39 ` [PATCH v2 5/9] null_blk: clean up the block device operations Damien Le Moal
2019-11-11  2:39 ` [PATCH v2 6/9] null_blk: clean up report zones Damien Le Moal
2019-11-11  2:39 ` [PATCH v2 7/9] null_blk: Add zone_nr_conv to features Damien Le Moal
2019-11-11  2:39 ` [PATCH v2 8/9] scsi: sd_zbc: Cleanup sd_zbc_alloc_report_buffer() Damien Le Moal
2019-11-11  6:56   ` Hannes Reinecke
2019-11-11 10:22   ` Christoph Hellwig
2019-11-13  1:46   ` Martin K. Petersen
2019-11-11  2:39 ` [PATCH v2 9/9] block: rework zone reporting Damien Le Moal
2019-11-13  2:16 ` [PATCH v2 0/9] Zoned block device enhancements and zone report rework Jens Axboe
2019-11-13  2:40   ` Damien Le Moal [this message]
2019-11-13  7:06   ` Christoph Hellwig

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