[PATCH v5 0/5] ublk: enable 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 3 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

Changes for v5:
 - Merge zone append patch and zone ops patch
 - Use defines instead of enum for opcodes
 - Add a helper `ublk_dev_is_zoned()`
 - Add a helper `ublk_dev_is_user_copy()`
 - Fix a leak in `ublk_report_zones()`
 - Use goto to handle cleanup in `ublk_report_zones()`
 - Change name of module from `ublk` back to `ublk_drv` and rename source files
 - Fail to add device if user copy is not supported (implicitly fail to start device under same condition)
 - Fail to add device if kernel is not compiled with CONFIG_BLK_DEV_ZONED
 - Fail to apply device parameters if chunk_sectors is not set while zoned support is requested
 - Change kconfig entry
 - Check max open/active zones are valid
 - Document UBLK_IO_OP_REPORT_ZONES buffer format
 - Use function stubs rather than if(IS_ENABLED(...))
 - Improve validation of zoned parameters

A user space component based on ubdsrv is available for testing [1] with the
"loop" target. No changes are required for user space for v4 -> v5.

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 (5):
  ublk: add opcode offsets for DRV_IN/DRV_OUT
  ublk: move types to shared header file
  ublk: rename driver files to prepare for multiple translation units
  ublk: add helper to check if device supports user copy
  ublk: enable zoned storage support

 MAINTAINERS                          |   4 +-
 drivers/block/Kconfig                |   5 +
 drivers/block/Makefile               |   2 +
 drivers/block/ublk-zoned.c           | 225 +++++++++++++++++++++++++++
 drivers/block/{ublk_drv.c => ublk.c} | 186 ++++++++++------------
 drivers/block/ublk.h                 | 180 +++++++++++++++++++++
 include/uapi/linux/ublk_cmd.h        |  44 +++++-
 7 files changed, 533 insertions(+), 113 deletions(-)
 create mode 100644 drivers/block/ublk-zoned.c
 rename drivers/block/{ublk_drv.c => ublk.c} (95%)
 create mode 100644 drivers/block/ublk.h


base-commit: 3261ea42710e9665c9151006049411bd23b5411f
-- 
2.41.0