Even though it's highly discouraged, there are existing
installs that are running overlay/overlay2 on filesystems
without d_type support.
This patch allows the daemon to start in such cases, instead of
refusing to start without an option to override.
For fresh installs, backing filesystems without d_type support
will still cause the overlay/overlay2 drivers to be marked as
"unsupported", and skipped during the automatic selection.
This feature is only to keep backward compatibility, but
will be removed at some point.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
0a4e793a3d