Traditional UNIX allows this and many other things.
(I'd love read() access on directories)
> Loopback mounts are comparatively easy because, while some things
> appear in different places, they're on a different file system,
> so there's no danger of accidentally crating cycles.
>
> The idea of hardlinked directories is fun to think about,
> but it's hairy. _Very_ hairy. My opinion: Don't Go There.
So we add an online garbage cleaner to kill disconnected loops.
Not pretty, but it works. The cleaner can get other jobs too,
like defragmentation and directory compaction.
Any other problems?
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