Re: [patch 41/48] ocfs2: Initialize the cluster were writing to ina non-sparse extend

[Joel Becker]

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@xxxxxxxxxx>
> 
> 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.

Joel

-- 

"Copy from one, it's plagiarism; copy from two, it's research."
        - Wilson Mizner

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