[PATCH v4 0/8] block: add zone write granularity limit

[Damien Le Moal]

The first patch of this series adds missing documentation of the
zone_append_max_bytes sysfs attribute.

The following 3 patches are cleanup and preparatory patches for the
introduction of the zone write granularity limit. The goal of these
patches is to have all code setting a device queue zoned model to use
the helper function blk_queue_set_zoned(). The nvme driver, null_blk
driver and the partition code are modified to do so.

The fourth patch in this series introduces the zone write granularity
queue limit to indicate the alignment constraint for write operations
into sequential zones of zoned block devices. This limit is always set
by default to the device logical block size. The following patch
documents this new limit.

The last 2 patches introduce the blk_queue_clear_zone_settings()
function and modify the SCSI sd driver to clear the zone related queue
limits and resources of a host-aware zoned disk that is changed to a
regular disk due to the presence of partitions.

Changes from v3:
* Added pathces 2, 3, 4, 7 and 8
* Addressed Christoph's comments on patch 5

Changes from v2:
* Added patch 3 for zonefs
* Addressed Christoph's comments on patch 1 and added the limit
  initialization for zoned nullblk

Changes from v1:
* Fixed typo in patch 2

Damien Le Moal (8):
  block: document zone_append_max_bytes attribute
  nvme: cleanup zone information initialization
  nullb: use blk_queue_set_zoned() to setup zoned devices
  block: use blk_queue_set_zoned in add_partition()
  block: introduce zone_write_granularity limit
  zonefs: use zone write granularity as block size
  block: introduce blk_queue_clear_zone_settings()
  sd_zbc: clear zone resources for non-zoned case

Damien Le Moal (8):
  block: document zone_append_max_bytes attribute
  nvme: cleanup zone information initialization
  nullb: use blk_queue_set_zoned() to setup zoned devices
  block: use blk_queue_set_zoned in add_partition()
  block: introduce zone_write_granularity limit
  zonefs: use zone write granularity as block size
  block: introduce blk_queue_clear_zone_settings()
  sd_zbc: clear zone resources for non-zoned case

 Documentation/block/queue-sysfs.rst | 13 +++++++++
 block/blk-settings.c                | 39 +++++++++++++++++++++++++-
 block/blk-sysfs.c                   |  8 ++++++
 block/blk-zoned.c                   | 17 ++++++++++++
 block/blk.h                         |  2 ++
 block/partitions/core.c             |  2 +-
 drivers/block/null_blk/zoned.c      |  8 +++---
 drivers/nvme/host/core.c            | 11 ++++----
 drivers/nvme/host/zns.c             | 11 ++------
 drivers/scsi/sd_zbc.c               | 43 ++++++++++++++++++++++++++---
 fs/zonefs/super.c                   |  9 +++---
 include/linux/blkdev.h              | 15 ++++++++++
 12 files changed, 150 insertions(+), 28 deletions(-)

-- 
2.29.2