gnbd_export(8) on Linux
The text f72b727f4884, as Debian 4.0 (Etch) shipped it.
the interface to export GNBDs
Flags it lists
-
-O -
-R -
-U -
-V -
-a -
-c -
-h -
-l -
-o -
-q -
-r -
-t -
-u -
-v