[PATCH v2 0/4] null_blk cleanup and device naming improvements

[Damien Le Moal <damien.lemoal@opensource.wdc.com>]

The first 3 patches of this series are simple code cleanups.

The last patch changes the device naming scheme for devices created
through configfs: the configfs device directory name is used as the disk
name. This name is also checked against potentially exiting nullb
devices created during modprobe when the nr_device module option is not
0.

This series falls short of pre-populating configfs with directories
corresponding to the devices created during modprobe as this is not
easily feasible. However, the added device name check avoids mistakes by
users about reusing configfs names already used by existing devices.

Changes from v1:
* Modified patch 3 to use the pr_fmt() macro instead of manually adding
  null_blk prefix to messages.
* Fixed patch 4 commit message

Damien Le Moal (4):
  block: null_blk: Fix code style issues
  block: null_blk: Cleanup device creation and deletion
  block: null_blk: Cleanup messages
  block: null_blk: Improve device creation with configfs

 drivers/block/null_blk/main.c  | 91 +++++++++++++++++++++++++---------
 drivers/block/null_blk/zoned.c |  7 ++-
 2 files changed, 73 insertions(+), 25 deletions(-)

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2.35.1