linux-kernel - Re: RFC: permit link(2) to work across --bind mounts ?

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Message-ID: <20071218230016.GF8181@ftp.linux.org.uk>
Date:	Tue, 18 Dec 2007 23:00:16 +0000
From:	Al Viro <viro@....linux.org.uk>
To:	Mark Lord <lkml@....ca>
Cc:	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: RFC: permit link(2)  to work across --bind mounts ?

On Tue, Dec 18, 2007 at 05:46:21PM -0500, Mark Lord wrote:
> Why does link(2) not support hard-linking across bind mount points
> of the same underlying filesystem ?

Because it gives you a security boundary around a subtree.
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