clean up zoned device information v2

[Christoph Hellwig]

Hi all,

this cleans up the block layer zoned device information APIs and
moves all fields currently in the request_queue to the gendisk as
they aren't relevant for passthrough I/O.

Changes since v1:
 - drop the blk-zoned/nvmet code sharing for now
 - use a helper a little earlier
 - various spelling fixes

Diffstat:
 block/bio.c                    |    2 
 block/blk-core.c               |   13 +--
 block/blk-merge.c              |    2 
 block/blk-mq-debugfs-zoned.c   |    6 -
 block/blk-mq.c                 |    2 
 block/blk-mq.h                 |   18 ++---
 block/blk-settings.c           |   11 +--
 block/blk-sysfs.c              |    8 --
 block/blk-zoned.c              |   85 ++++++++++++------------
 block/blk.h                    |    8 +-
 block/genhd.c                  |    1 
 block/ioctl.c                  |    2 
 block/partitions/core.c        |    2 
 drivers/block/null_blk/zoned.c |    8 +-
 drivers/md/dm-table.c          |    6 -
 drivers/md/dm-zone.c           |   86 +++++++++++-------------
 drivers/md/dm-zoned-target.c   |   25 +++----
 drivers/md/dm.c                |    2 
 drivers/nvme/host/multipath.c  |    2 
 drivers/nvme/host/zns.c        |    6 -
 drivers/nvme/target/zns.c      |   14 +--
 drivers/scsi/sd.c              |    6 -
 drivers/scsi/sd_zbc.c          |   10 +-
 fs/zonefs/super.c              |   17 ++--
 include/linux/blk-mq.h         |    8 +-
 include/linux/blkdev.h         |  144 +++++++++++++++--------------------------
 26 files changed, 227 insertions(+), 267 deletions(-)