linux-kernel - Re: [PATCH UPDATED] xen: add xenfs to allow usermode <-> Xen interaction

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Date:	Thu, 18 Dec 2008 14:18:12 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>, viro@....linux.org.uk,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xensource.com,
	alex.zeffertt@...citrix.com, Ian.Campbell@...rix.com
Subject: Re: [PATCH UPDATED] xen: add xenfs to allow usermode <-> Xen
	interaction


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Wed, 17 Dec 2008 13:24:39 -0800
> Jeremy Fitzhardinge <jeremy@...p.org> wrote:
> 
> > The xenfs filesystem exports various interfaces to usermode.  Initially
> > this exports a file to allow usermode to interact with xenbus/xenstore.
> > 
> > Traditionally this appeared in /proc/xen.  Rather than extending procfs,
> > this patch adds a backward-compat mountpoint on /proc/xen, and provides
> > a xenfs filesystem which can be mounted there.
> > 
> > [ 
> >   I did quite a lot of work to this code as a result of review, which is
> >   why this is a repost rather than a delta.  The changes are:
> > 
> >    - Moved the XENFS_SUPER_MAGIC to linux/magic.h
> >    - Added comments to answer the "what's this for?" questions (I hope)
> >    - Split things out into smaller functions
> >    - Cleaned up type of queue_reply(), removed casts
> >    - Added a mutex to protect struct xenbus_file_priv.  This protects
> >       the list heads, and the partial message buffer.  There were
> >       several ways in which usermode could overwrite the kernel's
> >       memory via races without this locking.
> >    - Fixed a bug in which usermode could start sending a message
> >       which can never be sent, leaving the file descriptor in a
> >       useless state.
> 
> I'm bored of your filesystem, so I think I'll just merge it, unless
> someone else wants to ;)

please do - there should be no big overlap with existing other Xen bits in 
tip/*.

	Ingo
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