linux-kernel - Re: [PATCH -V18 04/13] vfs: Allow handle based open on symlinks

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Message-ID: <20100820195303.20b17210@notabene>
Date:	Fri, 20 Aug 2010 19:53:03 +1000
From:	Neil Brown <neilb@...e.de>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	viro@...iv.linux.org.uk, adilger@....com, corbet@....net,
	npiggin@...e.de, hooanon05@...oo.co.jp, bfields@...ldses.org,
	miklos@...redi.hu, linux-fsdevel@...r.kernel.org,
	sfrench@...ibm.com, philippe.deniel@....FR,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -V18 04/13] vfs: Allow handle based open on symlinks

On Fri, 20 Aug 2010 04:30:57 -0400
Christoph Hellwig <hch@...radead.org> wrote:

> Suddenly getting an file pointer for a symlink which could never happen
> before is a really bad idea.  Just add a proper readlink_by_handle
> system call, similar to what's done in the XFS interface.

Why is that?
With futexes we suddenly get a file descriptor for something we could never
get a file descriptor on before and that doesn't seem to be a problem.

Why should symlinks be special as the only thing that you cannot have a file
descriptor for?  Uniformity of interface is a very valuable property.

NeilBrown
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