Merge branch 'overlayfs-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mszere...

Merge branch 'overlayfs-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs

Pull two overlayfs fixes from Miklos Szeredi:
 "Overlayfs rmdir() failed to check for emptiness in one case; this was
  introduced in 4.0.  The other bug was there since day one: failure to
  mount if upper fs is full, which bit some OpenWRT folks"

* 'overlayfs-next' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs:
  ovl: mount read-only if workdir can't be created
  ovl: don't remove non-empty opaque directory