[PATCH v10 0/3] ublk: enable zoned storage support

[Andreas Hindborg (Samsung)]

From: Andreas Hindborg <a.hindborg@xxxxxxxxxxx>

Hi All,

This patch set adds zoned storage support to `ublk`. The first two patches do
some house cleaning in preparation for the last patch. The last 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_RESET
 - REQ_OP_ZONE_APPEND

A user space component based on ubdsrv is available for testing [1] with the
"loop" target.

Read/write and zone operations are tested with zenfs [2].

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

The series is based on v6.5-rc4.

Changes for v10
 - Remove IO flag UBLK_IO_FLAG_ZONE_APPEND
 - Rename ublk_rq_data.nr_sectors to nr_zones
 - Change UAPI by adding field `nr_zones` in union with
   `ublksrv_io_desc.nr_sectors` and use zone count instead of sector count when
   applicable
 - Add documentation suggested Ming to UAPI `UBLK_IO_OP_REPORT_ZONES` and
   `ublksrv_io_cmd`
 - Updated user space component [1]

[1] https://github.com/metaspace/ubdsrv/tree/2966e5f9637b5856d4a4273ae113e31b1c53ff98
[2] https://github.com/westerndigitalcorporation/zenfs
[3] https://git.kernel.dk/linux.git

Andreas Hindborg (3):
  ublk: add helper to check if device supports user copy
  ublk: move check for empty address field on command submission
  ublk: enable zoned storage support

 drivers/block/ublk_drv.c      | 353 ++++++++++++++++++++++++++++++++--
 include/uapi/linux/ublk_cmd.h |  63 +++++-
 2 files changed, 388 insertions(+), 28 deletions(-)


base-commit: 5d0c230f1de8c7515b6567d9afba1f196fb4e2f4
-- 
2.41.0