[PATCH v4 0/4] ublk: add zoned storage support

[Andreas Hindborg <nmi@metaspace.dk>]

From: Andreas Hindborg <a.hindborg@samsung.com>

Hi All,

This patch set adds zoned storage support to `ublk`. The first two patches does
some house cleaning in preparation for the last two patches. The third patch
adds support for report_zones and the following operations:

 - REQ_OP_ZONE_OPEN
 - REQ_OP_ZONE_CLOSE
 - REQ_OP_ZONE_FINISH
 - REQ_OP_ZONE_RES

The last patch adds support for REQ_OP_ZONE_APPEND.

v3 [2] -> v4 changes:
 - Split up v3 patches
 - Add zone append support
 - Change order of variables in `ublk_report_zones`

Read/write and zone operations are tested with zenfs [3].

The zone append path is tested with fio -> zonefs -> ublk -> null_blk.

The implementation of zone append requires ublk user copy feature, and therefore
the series is based on branch for-next (6afa337a3789) of [4].

[1] https://github.com/metaspace/ubdsrv/commit/7de0d901c329fde7dc5a2e998952dd88bf5e668b
[2] https://lore.kernel.org/linux-block/20230316145539.300523-1-nmi@metaspace.dk/
[3] https://github.com/westerndigitalcorporation/zenfs
[4] https://git.kernel.dk/linux.git

Andreas Hindborg (4):
  ublk: change ublk IO command defines to enum
  ublk: move types to shared header file
  ublk: enable zoned storage support
  ublk: add zone append

 MAINTAINERS                    |   2 +
 drivers/block/Kconfig          |   4 +
 drivers/block/Makefile         |   4 +-
 drivers/block/ublk_drv-zoned.c | 155 +++++++++++++++++++++++++++++++++
 drivers/block/ublk_drv.c       | 150 +++++++++++++++++++------------
 drivers/block/ublk_drv.h       |  71 +++++++++++++++
 include/uapi/linux/ublk_cmd.h  |  38 ++++++--
 7 files changed, 363 insertions(+), 61 deletions(-)
 create mode 100644 drivers/block/ublk_drv-zoned.c
 create mode 100644 drivers/block/ublk_drv.h


base-commit: 3261ea42710e9665c9151006049411bd23b5411f
-- 
2.41.0