[dm-devel] [PATCH 00/10] dm: zoned block device support

[Damien Le Moal]

Hannes,

On 4/24/17 15:24, Hannes Reinecke wrote:
> On 04/21/2017 05:55 AM, damien.lemoal at wdc.com wrote:
>> From: Damien Le Moal <damien.lemoal at wdc.com>
>>
>> This series introduces zoned block device support to the device mapper
>> infrastructure. Pathces are as follows:
>>
>> - Patch 1: Add a new target type feature flag to indicate if a target type
>>   supports host-managed zoned block devices. This prevents using these drives
>>   with the current target types since none of them have the proper support
>>   implemented and will not operate properly with these drives.
>> - Patch 2: If a target device is a zoned block device, check that the range of
>>   LBAs mapped is aligned to the device zone size and that the device start
>>   offset also aligns to zone boundaries. This is necessary for zone reset and
>>   zone report correct execution.
>> - Patch 3: Check that the different target devices of a table have compatible
>>   zone sizes and models. This is necessary for target types that expose a zone
>>   model different from the underlying device.
>> - Patch 4: Fix handling of REQ_OP_ZONE_RESET bios
>> - Patch 5: Fix handling of REQ_OP_ZONE_REPORT bios
>> - Patch 6: Introduce a new helper function to reverse map a device zone report
>>   to the target LBA range
>> - Patch 7: Add support for host-managed zoned block devices to dm-flakey. This
>>   is necessary for testing file systems supporting natively these drives (e.g.
>>   f2fs).
>> - Patch 8: Add support for for zoned block devices to dm-linear. This can have
>>   useful applications during development and testing (e.g. allow creating
>>   smaller zoned devices with different combinations and positions of zones).
>>   There are also interesting applications for production, for instance, the
>>   ability to aggregate conventional zones of different drives to create a
>>   regular disk.
>> - Patch 9: Add sequential write enforcement to dm_kcopyd_copy so that
>>   sequential zones of a host-managed zoned block device can be specified as
>>   destinations.
>> - Patch 10: New dm-zoned target type (this was already sent for review twice).
>>   This resend adds modifications suggested by Hannes to implement reclaim
>>   using dm-kcopyd. dm-zoned depends on patch 9.
>>
>> As always, comments and reviews are welcome.
>>
>> Damien Le Moal (10):
>>   dm-table: Introduce DM_TARGET_ZONED_HM feature
>>   dm-table: Check device area zone alignment
>>   dm-table: Check block devices zone model compatibility
>>   dm: Fix REQ_OP_ZONE_RESET bio handling
>>   dm: Fix REQ_OP_ZONE_REPORT bio handling
>>   dm: Introduce dm_remap_zone_report()
>>   dm-flakey: Add support for zoned block devices
>>   dm-linear: Add support for zoned block devices
>>   dm-kcopyd: Add sequential write feature
>>   dm-zoned: Drive-managed zoned block device target
>>
>>  Documentation/device-mapper/dm-zoned.txt |  154 +++
>>  drivers/md/Kconfig                       |   19 +
>>  drivers/md/Makefile                      |    2 +
>>  drivers/md/dm-flakey.c                   |   21 +-
>>  drivers/md/dm-kcopyd.c                   |   68 +-
>>  drivers/md/dm-linear.c                   |   14 +-
>>  drivers/md/dm-table.c                    |  145 ++
>>  drivers/md/dm-zoned-io.c                 |  998 ++++++++++++++
>>  drivers/md/dm-zoned-metadata.c           | 2195 ++++++++++++++++++++++++++++++
>>  drivers/md/dm-zoned-reclaim.c            |  535 ++++++++
>>  drivers/md/dm-zoned.h                    |  528 +++++++
>>  drivers/md/dm.c                          |   93 +-
>>  include/linux/device-mapper.h            |   16 +
>>  include/linux/dm-kcopyd.h                |    1 +
>>  14 files changed, 4783 insertions(+), 6 deletions(-)
>>  create mode 100644 Documentation/device-mapper/dm-zoned.txt
>>  create mode 100644 drivers/md/dm-zoned-io.c
>>  create mode 100644 drivers/md/dm-zoned-metadata.c
>>  create mode 100644 drivers/md/dm-zoned-reclaim.c
>>  create mode 100644 drivers/md/dm-zoned.h
>>
> Very nice.
> 
> You can add my
> 
> Reviewed-by: Hannes Reinecke <hare at suse.com>
> 
> to the whole series.

Thank you for the review.

Best regards.

-- 
Damien Le Moal, Ph.D.
Sr. Manager, System Software Research Group,
Western Digital Corporation
Damien.LeMoal at wdc.com
(+81) 0466-98-3593 (ext. 513593)
1 kirihara-cho, Fujisawa,
Kanagawa, 252-0888 Japan
www.wdc.com, www.hgst.com
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