linux-kernel - Re: [patch 41/48] ocfs2: Initialize the cluster were writing to in a non-sparse extend

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Message-ID: <20090906083249.GA20761@mail.oracle.com>
Date:	Sun, 6 Sep 2009 01:32:50 -0700
From:	Joel Becker <Joel.Becker@...cle.com>
To:	Greg KH <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	stable@...nel.org, stable-review@...nel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Sunil Mushran <sunil.mushran@...cle.com>
Subject: Re: [patch 41/48] ocfs2: Initialize the cluster were writing to in
 a non-sparse extend

On Fri, Sep 04, 2009 at 02:00:40PM -0700, Joel Becker wrote:
> On Fri, Sep 04, 2009 at 01:07:53PM -0700, Greg KH wrote:
> > 2.6.27-stable review patch.  If anyone has any objections, please let us know.
> > 
> > ------------------
> > From: Sunil Mushran <sunil.mushran@...cle.com>
> > 
> > commit e7432675f8ca868a4af365759a8d4c3779a3d922 upstream.
> > 
> > In a non-sparse extend, we correctly allocate (and zero) the clusters between
> > the old_i_size and pos, but we don't zero the portions of the cluster we're
> > writing to outside of pos<->len.
> > 
> > It handles clustersize > pagesize and blocksize < pagesize.
> > 
> > [Cleaned up by Joel Becker.]
> 
> Greg, et al,
> 	Yesterday we found a bug in this patch.  The patch still fixes
> the original problem, but we introduced an error in certain
> page_mkwrite() corner cases.  We have one more validation test and then
> I'm sending the fix to Linus.
> 	So we really want both this commit and the followup fix in
> -stable.  You'll be CC'd when I send Linus the pull request.

	Ok, the fix is upstream, commit
8379e7c46cc48f51197dd663fc6676f47f2a1e71.  It applies on top of this
patch, and is needed for both stable trees.

Joel

-- 

Life's Little Instruction Book #335

	"Every so often, push your luck."

Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@...cle.com
Phone: (650) 506-8127
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