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From: Jens Axboe <>
To: Damien Le Moal <>,,,
	"Martin K . Petersen" <>,, Mike Snitzer <>,,
	Jaegeuk Kim <>, Chao Yu <>
Subject: Re: [PATCH v2 0/9] Zoned block device enhancements and zone report rework
Date: Tue, 12 Nov 2019 19:16:39 -0700
Message-ID: <> (raw)
In-Reply-To: <>

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.

Jens Axboe

  parent 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 ` Jens Axboe [this message]
2019-11-13  2:40   ` [PATCH v2 0/9] Zoned block device enhancements and zone report rework Damien Le Moal
2019-11-13  7:06   ` Christoph Hellwig

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