RE: md raid acceleration and the async_tx api

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> From: Mr. James W. Laferriere [mailto:babydr@xxxxxxxxxxxxxxxx]
>  	Hello Dan ,
> 
> On Thu, 13 Sep 2007, Dan Williams wrote:
> > On 9/13/07, Yuri Tikhonov <yur@xxxxxxxxxxx> wrote:
> >>  Hi Dan,
> >> On Friday 07 September 2007 20:02, you wrote:
> >>> You need to fetch from the 'md-for-linus' tree.  But I have
attached
> >>> them as well.
> >>>
> >>> git fetch git://lost.foo-projects.org/~dwillia2/git/iop
> >>> md-for-linus:md-for-linus
> >>
> >>  Thanks.
> >>
> >>  Unrelated question. Comparing the drivers/md/raid5.c file in the
Linus's
> >> 2.6.23-rc6 tree and in your md-for-linus one I'd found the
following
> >> difference in the expand-related part of the handle_stripe5()
function:
> >>
> >> -               s.locked += handle_write_operations5(sh, 1, 1);
> >> +               s.locked += handle_write_operations5(sh, 0, 1);
> >>
> >>  That is, in your case we are passing rcw=0, whereas in the Linus's
case
> the
> >> handle_write_operation5() is called with rcw=1. What code is
correct ?
> >>
> > There was a recent bug discovered in my changes to the expansion
code.
> > The fix has now gone into Linus's tree through Andrew's tree.  I
kept
> > the fix out of my 'md-for-linus' tree to prevent it getting dropped
> > from -mm due to automatic git-tree merge-detection.  I have now
> > rebased my git tree so everything is in sync.
> >
> > However, after talking with Neil at LCE we came to the conclusion
that
> > it would be best if I just sent patches since git tree updates tend
to
> > not get enough review, and because the patch sets will be more
> > manageable now that the big pieces of the acceleration
infrastructure
> > have been merged.
> >
> >>  Regards, Yuri
> >
> > Thanks,
> > Dan
>  	Does this discussion of patches include any changes to cure the
'BUG'
> instance I reported ?
> 
>  	ie: raid5:md3: kernel BUG , followed by , Silent halt .
No, this is referring to:
http://marc.info/?l=linux-raid&m=118845398229443&w=2

The BUG you reported currently looks to be caused by interactions with
the bitmap support code... still investigating.

>  		Tia ,  JimL

Thanks,
Dan
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