[dm-devel] [PATCH v3 00/10] dm: zoned block device support
Mike Snitzer
snitzer at redhat.com
Tue May 16 20:03:57 UTC 2017
I see quite a few issues with this patchset (only gotten through patches
1 - 6). I'll work through it in more detail and share my
feedback/revisions tomorrow. Mostly just cleanups, renames, etc. But
"the fun" is obviously once I get to the last patch.
Mike
On Mon, May 08 2017 at 7:40pm -0400,
Bart Van Assche <bart.vanassche at sandisk.com> wrote:
> From: Damien Le Moal <damien.lemoal at wdc.com>
>
> [ Note: I'm resending this patch series on Damien's behalf because Damien's ]
> [ e-mails apparently do not reach the dm-devel mailing list - Bart. ]
>
> 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.
>
> Changes from v2:
> - Rebased on 4.12-rc tree
> - Added Bart Reviewed-by tag
>
> Changes from v1:
> - Use for-loop in patch 3 as suggested by Bart
> - Add memory shrinker to dm-zoned to shrink the metadata block cache under
> memory pressure (suggested by Bart)
> - Added Hannes Reviewed-by tag
>
> 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 | 17 +
> drivers/md/Makefile | 2 +
> drivers/md/dm-flakey.c | 21 +-
> drivers/md/dm-kcopyd.c | 68 +-
> drivers/md/dm-linear.c | 15 +-
> drivers/md/dm-table.c | 143 ++
> drivers/md/dm-zoned-io.c | 999 ++++++++++++++
> drivers/md/dm-zoned-metadata.c | 2225 ++++++++++++++++++++++++++++++
> drivers/md/dm-zoned-reclaim.c | 535 +++++++
> drivers/md/dm-zoned.h | 530 +++++++
> drivers/md/dm.c | 93 +-
> include/linux/device-mapper.h | 16 +
> include/linux/dm-kcopyd.h | 1 +
> 14 files changed, 4812 insertions(+), 7 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
>
> --
> 2.9.3
>
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