Thanks, that's really nice.
I'd assumed `kern_mount' was similar to mounting a normal filesystem,
but in a non-existent namespace. Traditionally in unix you can't
unmount a filesystem when its in use, and mounts don't disappear when
the last file being used on them disappears.
But you've rather cutely arranged that these kinds of mount _do_
disappear when the last file being used on them disappears. Clever, if
a bit disturbing.
-- Jamie
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