gfs2_jadd(8) on Linux
The text b747656f5d81, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it.
Add journals to a GFS2 filesystem
Flags it lists
-
-D -
-J -
-V -
-c -
-h -
-j -
-q