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

Pull mount fixes from Al Viro:
 "A couple of races around legalize_mnt vs umount (both fairly old and
  hard to hit) plus two bugs in move_mount(2) - both around 'move
  detached subtree in place' logics"

* tag 'pull-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
  fix IS_MNT_PROPAGATING uses
  do_move_mount(): don't leak MNTNS_PROPAGATING on failures
  do_umount(): add missing barrier before refcount checks in sync case
  __legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock