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

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Message-Id: <200806021701.17076.arnd@arndb.de>
Date:	Mon, 2 Jun 2008 17:01:16 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	hooanon05@...oo.co.jp
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

On Monday 02 June 2008, hooanon05@...oo.co.jp wrote:
> Aure rename returns EXDEV when the target is a dir and it has child
> entr(y|ies) on lower branhc(es). And mv(1) handles this case.
> My Engilsh might be miunderstood. Do you think link(2) should return an
> error when the target exists on lower writable branch?

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.

	Arnd <><
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