Merge tag 'pull-mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Pull vfs mount updates from Al Viro:

 - mount hash conflicts rudiments are gone now - we do not allow
     multiple mounts with the same parent/mountpoint to be hashed at the
     same time.

 - 'struct mount' changes:
      - mnt_umounting is gone
      - mnt_slave_list/mnt_slave is an hlist now
      - overmounts are kept track of by explicit pointer in mount
      - a bunch of flags moved out of mnt_flags to a new field, with
        only namespace_sem for protection
      - mnt_expiry is protected by mount_lock now (instead of
        namespace_sem)
      - MNT_LOCKED is used only for mounts that need to remain attached
        to their parents to prevent mountpoint exposure - no more
        overloading it for absolute roots
      - all mnt_list uses are transient now - it's used only to
        represent temporary sets during umount_tree()

 - mount refcounting change: children no longer pin parents for any
   mounts, whether they'd passed through umount_tree() or not

 - 'struct mountpoint' changes:
      - refcount is no more; what matters is ->m_list emptiness
      - instead of temporary bumping the refcount, we insert a new
        object (pinned_mountpoint) into ->m_list
      - new calling conventions for lock_mount() and friends

 - do_move_mount()/attach_recursive_mnt() seriously cleaned up

 - globals in fs/pnode.c are gone

 - propagate_mnt(), change_mnt_propagation() and propagate_umount()
   cleaned up (in the last case - pretty much completely rewritten).

 - freeing of emptied mnt_namespace is done in namespace_unlock(). For
   one thing, there are subtle ordering requirements there; for another
   it simplifies cleanups.

 - assorted cleanups

 - restore the machinery for long-term mounts from accumulated bitrot.

   This is going to get a followup come next cycle, when the change of
   vfs_fs_parse_string() calling conventions goes into -next

* tag 'pull-mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (48 commits)
  statmount_mnt_basic(): simplify the logics for group id
  invent_group_ids(): zero ->mnt_group_id always implies !IS_MNT_SHARED()
  get rid of CL_SHARE_TO_SLAVE
  take freeing of emptied mnt_namespace to namespace_unlock()
  copy_tree(): don't link the mounts via mnt_list
  change_mnt_propagation(): move ->mnt_master assignment into MS_SLAVE case
  mnt_slave_list/mnt_slave: turn into hlist_head/hlist_node
  turn do_make_slave() into transfer_propagation()
  do_make_slave(): choose new master sanely
  change_mnt_propagation(): do_make_slave() is a no-op unless IS_MNT_SHARED()
  change_mnt_propagation() cleanups, step 1
  propagate_mnt(): fix comment and convert to kernel-doc, while we are at it
  propagate_mnt(): get rid of last_dest
  fs/pnode.c: get rid of globals
  propagate_one(): fold into the sole caller
  propagate_one(): separate the "what should be the master for this copy" part
  propagate_one(): separate the "do we need secondary here?" logics
  propagate_mnt(): handle all peer groups in the same loop
  propagate_one(): get rid of dest_master
  mount: separate the flags accessed only under namespace_sem
  ...

diff --cc fs/hugetlbfs/inode.c
Simple merge

diff --cc ipc/mqueue.c
Simple merge