linux-kernel - Re: [Xen-devel] [PATCHv3 0/2] libfs, xenfs: replace /proc/xen/xenbus with a symlink

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Message-ID: <5db63ecb-3528-6745-8144-561d4f0e35d6@cardoe.com>
Date:   Mon, 22 Aug 2016 20:47:51 -0400
From:   Doug Goldstein <cardoe@...doe.com>
To:     David Vrabel <david.vrabel@...rix.com>,
        Alexander Viro <viro@...iv.linux.org.uk>
Cc:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>
Subject: Re: [Xen-devel] [PATCHv3 0/2] libfs, xenfs: replace /proc/xen/xenbus
 with a symlink

On 6/28/16 2:06 PM, David Vrabel wrote:
> 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.
> 
> Changes in v3:
> - Rebased on v4.7-rc5.
> 
> David

Just a bit of a nudge to see where the status of this is at? We're at
the point of potentially having yet another kernel release go out the
door where the default behavior with Xen 4.6 and earlier is to deadlock
domUs.

-- 
Doug Goldstein



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