Re: Loopback (dir->dir) mounting (NOT -o loop)

From: Nix (
Date: Wed Jun 07 2000 - 02:14:19 EST

Alexander Viro <> writes:

> There is no such thing as "global namespace", the only reason why
> it looks that way now is the lack of CLONE_NAMESPACE. Per-user namespaces
> are bogus, what you want is the ability to copy namespace upon clone()
> instead of sharing the thing with parent.

Unfortunately, there are frequently administrative reasons to say,

`everyone unmount this right now, we need to take this disk offline'
(chance to everyone's namespace)

`mount this so that all my daemons can see it' (change to namespace
unrelated to yours)

`everyone mount this right now, that disk is replaced and /opt/glurk is
back where it should be'.

I don't think automounters suffice for all of this --- and automounters
are arguably overkill for this sort of thing, anyway. Is there a way to
say that, if some processes' namespaces are clone/separated from all the

`It's as if Hal Clement expanded fragments of a novel
 by H.P. Lovecraft.' --- Jake Kesinger on the novel _Darwinia_.

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