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

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Date:   Thu,  3 Aug 2023 16:06:58 +0200
From:   "Andreas Hindborg (Samsung)" <nmi@...aspace.dk>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Christoph Hellwig <hch@...radead.org>, gost.dev@...sung.com,
        linux-block@...r.kernel.org (open list:BLOCK LAYER),
        Hans Holmberg <Hans.Holmberg@....com>,
        Matias Bjorling <Matias.Bjorling@....com>,
        Andreas Hindborg <a.hindborg@...sung.com>,
        Minwoo Im <minwoo.im.dev@...il.com>,
        Jens Axboe <axboe@...nel.dk>,
        Johannes Thumshirn <jth@...nel.org>,
        Aravind Ramesh <Aravind.Ramesh@....com>,
        Damien Le Moal <dlemoal@...nel.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v10 0/3] ublk: enable zoned storage support

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

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