remove revalidate_disk()

[Christoph Hellwig]

Hi Jens,

this series removes the revalidate_disk() function, which has been a
really odd duck in the last years.  The prime reason why most people
use it is because it propagates a size change from the gendisk to
the block_device structure.  But it also calls into the rather ill
defined ->revalidate_disk method which is rather useless for the
callers.  So this adds a new helper to just propagate the size, and
cleans up all kinds of mess around this area.  Follow on patches
will eventuall kill of ->revalidate_disk entirely, but ther are a lot
more patches needed for that.

Diffstat:
 Documentation/filesystems/locking.rst |    3 --
 block/genhd.c                         |    9 ++----
 drivers/block/nbd.c                   |    8 ++---
 drivers/block/rbd.c                   |    2 -
 drivers/block/rnbd/rnbd-clt.c         |   10 +------
 drivers/block/virtio_blk.c            |    2 -
 drivers/block/zram/zram_drv.c         |    4 +-
 drivers/md/dm-raid.c                  |    2 -
 drivers/md/md-cluster.c               |    6 ++--
 drivers/md/md-linear.c                |    2 -
 drivers/md/md.c                       |   10 +++----
 drivers/md/md.h                       |    2 -
 drivers/nvdimm/blk.c                  |    3 --
 drivers/nvdimm/btt.c                  |    3 --
 drivers/nvdimm/bus.c                  |    9 ++----
 drivers/nvdimm/nd.h                   |    2 -
 drivers/nvdimm/pmem.c                 |    3 --
 drivers/nvme/host/core.c              |   16 +++++++----
 drivers/scsi/sd.c                     |    6 ++--
 fs/block_dev.c                        |   46 ++++++++++++++++------------------
 include/linux/blk_types.h             |    4 ++
 include/linux/genhd.h                 |    6 ++--
 22 files changed, 74 insertions(+), 84 deletions(-)