introduce bdev holder ops and a file system shutdown method v3

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Hi all,

this series fixes the long standing problem that we never had a good way
to communicate block device events to the user of the block device.

It fixes this by introducing a new set of holder ops registered at
blkdev_get_by_* time for the exclusive holder, and then wire that up
to a shutdown super operation to report the block device remove to the
file systems.

Changes since v2:
 - rename a method in xfs
 - add ext4 support

Changes since v1:
 - add a patch to refactor bd_may_claim
 - add a sanity check for mismatching holder ops in bd_may_claim
 - move partition removal later in del_gendisk so that partitions
   are still around for the shutdown notification
 - add SHUTDOWN_DEVICE_REMOVED to XFS_SHUTDOWN_STRINGS

Diffstat:
 block/bdev.c                        |  159 ++++++++++++++++++++----------------
 block/blk.h                         |    2 
 block/fops.c                        |    2 
 block/genhd.c                       |   78 +++++++++++++----
 block/ioctl.c                       |    3 
 block/partitions/core.c             |   31 +++----
 drivers/block/drbd/drbd_nl.c        |    3 
 drivers/block/loop.c                |    2 
 drivers/block/pktcdvd.c             |    5 -
 drivers/block/rnbd/rnbd-srv.c       |    2 
 drivers/block/xen-blkback/xenbus.c  |    2 
 drivers/block/zram/zram_drv.c       |    2 
 drivers/md/bcache/super.c           |    2 
 drivers/md/dm.c                     |    2 
 drivers/md/md.c                     |    2 
 drivers/mtd/devices/block2mtd.c     |    4 
 drivers/nvme/target/io-cmd-bdev.c   |    2 
 drivers/s390/block/dasd_genhd.c     |    2 
 drivers/target/target_core_iblock.c |    2 
 drivers/target/target_core_pscsi.c  |    3 
 fs/btrfs/dev-replace.c              |    2 
 fs/btrfs/volumes.c                  |    6 -
 fs/erofs/super.c                    |    2 
 fs/ext4/ext4.h                      |    1 
 fs/ext4/ioctl.c                     |   24 +++--
 fs/ext4/super.c                     |   18 +++-
 fs/f2fs/super.c                     |    4 
 fs/jfs/jfs_logmgr.c                 |    2 
 fs/nfs/blocklayout/dev.c            |    5 -
 fs/nilfs2/super.c                   |    2 
 fs/ocfs2/cluster/heartbeat.c        |    2 
 fs/reiserfs/journal.c               |    5 -
 fs/super.c                          |   21 ++++
 fs/xfs/xfs_fsops.c                  |    3 
 fs/xfs/xfs_mount.h                  |    4 
 fs/xfs/xfs_super.c                  |   21 ++++
 include/linux/blk_types.h           |    2 
 include/linux/blkdev.h              |   12 ++
 include/linux/fs.h                  |    1 
 kernel/power/swap.c                 |    4 
 mm/swapfile.c                       |    3 
 41 files changed, 297 insertions(+), 157 deletions(-)



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