IIRC before that Unix had directories, but it wasn't a rooted DAG. I don't recall the specifics, but I suspect you had to know a directory's inode to get to it

IIRC before that Unix had directories, but it wasn't a rooted DAG. I don't recall the specifics, but I suspect you had to know a directory's inode to get to it if you couldn't reach it from where you were.