Jens,

This series provides fixes and improvements for null_blk.

The first two patches are bug fixes which likely should go into 5.10.
The first patch fixes a problem with zone initialization when the
device capacity is not a multiple of the zone size and the second
patch fixes zone append handling.

The following patches are improvements and cleanups:
* Patch 3 makes sure that the device max_sectors limit is aligned to the
  block size.
* Patch 4 improves zone locking overall, and especially the memory
  backing disabled case by introducing a spinlock array to implement a
  per zone lock in place of a global lock. With this patch, write
  performance remains mostly unchanged, but read performance with a
  multi-queue setup more than double from 1.3 MIOPS to 3.3 MIOPS (4K
  random reads to zones with fio zonemode=zbd).
* Patch 5 improves implicit zone close
* Patch 6 and 7 cleanup discard handling code and use that code to free
  the memory backing a zone that is being reset.
* Patch 8 adds the max_sectors configuration option to allow changing
  the max_sectors/max_hw_sectors of the device.
* Finally, patch 9 moves nullblk into its own directory under
  drivers/block/null_blk/

Comments are as always welcome.

Damien Le Moal (9):
  null_blk: Fix zone size initialization
  null_blk: Fail zone append to conventional zones
  null_blk: Align max_hw_sectors to blocksize
  null_blk: improve zone locking
  null_blk: Improve implicit zone close
  null_blk: cleanup discard handling
  null_blk: discard zones on reset
  null_blk: Allow controlling max_hw_sectors limit
  null_blk: Move driver into its own directory

 drivers/block/Kconfig                         |   8 +-
 drivers/block/Makefile                        |   7 +-
 drivers/block/null_blk/Kconfig                |  12 +
 drivers/block/null_blk/Makefile               |  11 +
 .../{null_blk_main.c => null_blk/main.c}      |  65 +++--
 drivers/block/{ => null_blk}/null_blk.h       |   9 +-
 .../{null_blk_trace.c => null_blk/trace.c}    |   2 +-
 .../{null_blk_trace.h => null_blk/trace.h}    |   2 +-
 .../{null_blk_zoned.c => null_blk/zoned.c}    | 245 ++++++++++++------
 9 files changed, 239 insertions(+), 122 deletions(-)
 create mode 100644 drivers/block/null_blk/Kconfig
 create mode 100644 drivers/block/null_blk/Makefile
 rename drivers/block/{null_blk_main.c => null_blk/main.c} (97%)
 rename drivers/block/{ => null_blk}/null_blk.h (94%)
 rename drivers/block/{null_blk_trace.c => null_blk/trace.c} (93%)
 rename drivers/block/{null_blk_trace.h => null_blk/trace.h} (97%)
 rename drivers/block/{null_blk_zoned.c => null_blk/zoned.c} (76%)

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2.26.2