From owner-freebsd-current@FreeBSD.ORG  Fri Apr 22 15:38:46 2005
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from green.homeunix.org (freefall.freebsd.org [216.136.204.21])
	by hub.freebsd.org (Postfix) with ESMTP
	id D457916A4CE; Fri, 22 Apr 2005 15:38:45 +0000 (GMT)
Received: from green.homeunix.org (green@localhost [127.0.0.1])
	by green.homeunix.org (8.13.3/8.13.1) with ESMTP id j3MFZMOR087413;
	Fri, 22 Apr 2005 11:35:22 -0400 (EDT)
	(envelope-from green@green.homeunix.org)
Received: (from green@localhost)
	by green.homeunix.org (8.13.3/8.13.1/Submit) id j3MFZMbb087412;
	Fri, 22 Apr 2005 11:35:22 -0400 (EDT)
	(envelope-from green)
Date: Fri, 22 Apr 2005 11:35:22 -0400
From: Brian Fundakowski Feldman <green@FreeBSD.ORG>
To: Garrett Wollman <wollman@csail.mit.edu>
Message-ID: <20050422153522.GN1157@green.homeunix.org>
References: <20050419204723.GG1157@green.homeunix.org>
	<20050420140409.GA77731@stack.nl> <20050420142448.GH1157@green.homeunix.org>
	<20050420143842.GB77731@stack.nl> <20050420152038.GI1157@green.homeunix.org>
	<20050420153528.GC77731@stack.nl> <20050420155233.GJ1157@green.homeunix.org>
	<16998.37222.529748.205885@khavrinen.csail.mit.edu>
	<20050422150835.GM1157@green.homeunix.org>
	<17001.6159.521697.442481@khavrinen.csail.mit.edu>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <17001.6159.521697.442481@khavrinen.csail.mit.edu>
User-Agent: Mutt/1.5.6i
cc: freebsd-hackers@FreeBSD.ORG
cc: freebsd-current@FreeBSD.ORG
Subject: Re: NFS client/buffer cache deadlock
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 22 Apr 2005 15:38:46 -0000

On Fri, Apr 22, 2005 at 11:28:15AM -0400, Garrett Wollman wrote:
> <<On Fri, 22 Apr 2005 11:08:35 -0400, Brian Fundakowski Feldman <green@FreeBSD.ORG> said:
> 
> 
> > Can you find any evidence that it's acceptable to interleave multiple
> > writers that are doing O_APPEND?  At best, to do what you're asking,
> > they could be kept from being interleaved from the context of one
> > specific NFS client host...
> 
> As far as POSIX goes, the standard says that applications are expected
> to handle serialization.  It makes no exception for O_APPEND.

Then let's fix IO_UNIT so the existing code can DTRT.

-- 
Brian Fundakowski Feldman                           \'[ FreeBSD ]''''''''''\
  <> green@FreeBSD.org                               \  The Power to Serve! \
 Opinions expressed are my own.                       \,,,,,,,,,,,,,,,,,,,,,,\