[PATCH 0/3] Some null_blk cleanups

[Damien Le Moal <dlemoal@kernel.org>]

3 patches to cleanup null_blk main code and improve zone device support.
With the last 2 patches, some performance improvements (up to +1.7%) can
be measured for a null zoned device with no zone resource limits. The
maximum IOPS measured with zone write plugging with a multi-stream 4K
sequential write workload (32 jobs) is:

Before patches:
 - mq-deadline: 596 KIOPS
 - none: 2406 KIOPS

With patches applied:
 - mq-deadline: 600 KIOPS
 - none: 2447 KIOPS

Overall, there is no functional change.

Damien Le Moal (3):
  null_blk: Have all null_handle_xxx() return a blk_status_t
  null_blk: Do zone resource management only if necessary
  null_blk: Simplify null_zone_write()

 drivers/block/null_blk/main.c  |  18 +-
 drivers/block/null_blk/zoned.c | 343 +++++++++++++++++----------------
 2 files changed, 187 insertions(+), 174 deletions(-)

-- 
2.44.0