Ah, okay. Oddly, the man page on my system doesn't have that caveat listed. For the EXDEV error, it just says "oldpath and newpath are not on the same filesystem."
I guess I'll try switching back to symlinks instead of bind mounts.
The
answer from the filesystem gurus, is that the restriction is (1) artificial, and (2) deliberate. It's there to enable a way to impose extra security on a multi-user system.
But for a single-user system (single regular user, "you", plus the superuser "root"), there's no need. So the patch I posted ought to be safe for your own machines.
Cheers
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