linux-kernel - RE: [PATCH 041/270] pnfsblock: fix partial page buffer wirte

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Message-ID: <4FA345DA4F4AE44899BD2B03EEEC2FA90B32EE5D@SACEXCMBX04-PRD.hq.netapp.com>
Date:	Fri, 30 Nov 2012 13:48:06 +0000
From:	"Myklebust, Trond" <Trond.Myklebust@...app.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ben Hutchings <ben@...adent.org.uk>
CC:	Peng Tao <tao.peng@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	"kernel-team@...ts.ubuntu.com" <kernel-team@...ts.ubuntu.com>,
	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Subject: RE: [PATCH 041/270] pnfsblock: fix partial page buffer wirte

> -----Original Message-----
> From: Greg Kroah-Hartman [mailto:gregkh@...uxfoundation.org]
> Sent: Thursday, November 29, 2012 8:46 PM
> To: Ben Hutchings
> Cc: Peng Tao; Myklebust, Trond; linux-kernel@...r.kernel.org;
> stable@...r.kernel.org; kernel-team@...ts.ubuntu.com; Herton Ronaldo
> Krzesinski
> Subject: Re: [PATCH 041/270] pnfsblock: fix partial page buffer wirte
> 
> On Tue, Nov 27, 2012 at 02:33:24AM +0000, Ben Hutchings wrote:
> > On Mon, 2012-11-26 at 14:55 -0200, Herton Ronaldo Krzesinski wrote:
> > > 3.5.7u1 -stable review patch.  If anyone has any objections, please let me
> know.
> > >
> > > ------------------
> > >
> > > From: Peng Tao <bergwolf@...il.com>
> > >
> > > commit fe6e1e8d9fad86873eb74a26e80a8f91f9e870b5 upstream.
> > >
> > > If applications use flock to protect its write range, generic NFS
> > > will not do read-modify-write cycle at page cache level. Therefore
> > > LD should know how to handle non-sector aligned writes. Otherwise
> > > there will be data corruption.
> > >
> > > Signed-off-by: Peng Tao <tao.peng@....com>
> > > Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
> > > Signed-off-by: Herton Ronaldo Krzesinski
> > > <herton.krzesinski@...onical.com>
> > [...]
> >
> > I notice that this fix is missing from 3.4, and will need backporting.
> 
> I don't trust myself with backporting this, as I got it wrong.  So if one of the
> NFS developers wants to do this (same goes for the other NFS patch), I'll
> gladly take it.
> 

Tao would be the right person to do this since he has access to pNFS blocks hardware and can test the results.

Cheers
  Trond
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