uadefs: disallow creating files on uadefs [PERFECTIVE]
uadefs: disallow creating files on uadefs [PERFECTIVE]

We don't guarantee locking semantics or specialties that are assumed
from normal filesystems, so deny creating files. One can always make
file modifications in the real source directory, that is, not under
uadefs.

mvtiaine/uade,mldoering/uade-mld-git,mldoering/uade-mld-git,mvtiaine/uade,mvtiaine/uade,mldoering/uade-mld-git,mldoering/uade-mld-git,mvtiaine/uade