Two different topics concerning the virtual filesystem (VFS) layer were the
subject of a session led by VFS co-maintainer Christian Brauner at the
2023 Linux Storage, Filesystem,
Memory-Management and BPF Summit. As might be guessed, it was a
filesystem-track session; Brauner had three separate items he planned on
bringing up, but the discussion on the first two consumed the whole
half-hour—and then some. A mechanism to avoid media-change races when
mounting loop (or loopback) and other devices was disposed of fairly
quickly, but the
discussion around the mount-beneath feature went on at length.

Source: LWN.net – [$] Two VFS topics