MNTGEN(4)
NAME
mntgen − dynamically generate mount points
SYNOPSIS
mount {mntgen} dir
DESCRIPTION
Mntgen serves 9P on its standard input, providing a name space containing a single directory that is initially empty, but in which a subdirectory name appears when is first referenced, and remains only as long as it is needed (referenced). Mntgen is typically mounted on a directory dir using mount (see bind(1)) as above. Dir is commonly /n or /mnt, to generate mount points on demand for file systems or services.
SOURCE
/appl/cmd/mntgen.b