linux-kernel - Re: [RFC 0/7] [RFC] cramfs: fake write support

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Message-ID: <8486.1212491081@jrobl>
Date:	Tue, 03 Jun 2008 20:04:41 +0900
From:	hooanon05@...oo.co.jp
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Jamie Lokier <jamie@...reable.org>,
	Phillip Lougher <phillip@...gher.demon.co.uk>,
	David Newall <davidn@...idnewall.com>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	hch@....de
Subject: Re: [RFC 0/7] [RFC] cramfs: fake write support 


Arnd Bergmann:
> Any writes should always just go to the top level. If the source file
> for link() exists on the top level, link should succeed even if a target
> exists on a lower level (given that the user has permissions to
> unlink that file), but should return EXDEV if the source comes from
> a lower level.

Then what will happen when a user builds a union by "empty tmpfs" +
"cramfs"? Following your design, link(2) becomes useless in stacking fs.

You may be considering to implement a new dynamic link library for
stacking.
Hmm, that is intersting. It may be worth to think.


Junjiro Okajima
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