linux-kernel - libfs,xenfs: replace /proc/xen/xenbus with a symlink

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Message-ID: <1463480843-3860-1-git-send-email-david.vrabel@citrix.com>
Date:	Tue, 17 May 2016 11:27:21 +0100
From:	David Vrabel <david.vrabel@...rix.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>
CC:	David Vrabel <david.vrabel@...rix.com>,
	<linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<xen-devel@...ts.xenproject.org>,
	"Boris Ostrovsky" <boris.ostrovsky@...cle.com>,
	Juergen Gross <jgross@...e.com>
Subject: libfs,xenfs: replace /proc/xen/xenbus with a symlink

Using /proc/xen/xenbus can cause deadlocks on the atomic file position
mutex since this file should behave like a character device and not a
regular file.  This is easiest to achive by making it a symlink to the
existing /dev/xen/xenbus device.

This requires extending simple_fill_super() to add symlinks as well as
regular files.

David