convert nvme to atomic queue limits updates

[Christoph Hellwig]

Hi all,

this series converts nvme to the new atomic queue limit updates, and
as part of that refactors a lot of the setup code.  The first two
patches are block layer patches already sent out as part of the md
queue limits conversion and will hopefully get merged into Jens' tree
soon.

Diffstat:
 block/blk-settings.c          |   43 ++++
 drivers/nvme/host/apple.c     |   18 +-
 drivers/nvme/host/core.c      |  378 ++++++++++++++++++++----------------------
 drivers/nvme/host/fc.c        |    8 
 drivers/nvme/host/multipath.c |   13 -
 drivers/nvme/host/nvme.h      |   12 -
 drivers/nvme/host/rdma.c      |   13 -
 drivers/nvme/host/zns.c       |   24 --
 drivers/nvme/target/loop.c    |    5 
 include/linux/blkdev.h        |    3 
 10 files changed, 272 insertions(+), 245 deletions(-)