From owner-freebsd-geom@FreeBSD.ORG  Wed Mar 17 15:46:41 2010
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Subject: Re: geom_label and directories under /dev
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On Mon, 15 Mar 2010 21:51:00 +0200, Jaakko Heinonen wrote:

> Hi,
> 
> I was working to fix problems with GEOM label class allowing some
> problematic label names which can't represent proper files under /dev.
> For example:
> 
> - empty label
> - "." and ".."
> - labels starting or ending with '/'
> - labels ending with /.. (Due to a bug for example /..foo/.. is
>   allowed.)
> 
> So it's probably a dead end to try to suggest disallowing of '/'?
> Unfortunately it's not easy to fix all problems with directories. For
> starters devfs doesn't support removal of directories at all.
> 
> Opinions?

How about using URL encoding scheme[1] for dev names ?
That way you will be able to unambigously preserve all characters.
The algorithm is very easy, predictable and almost anyone using www is 
already familiar with it.

[1] http://en.wikipedia.org/wiki/Percent-encoding