Re: Mount ext3 with barrier=1 doesn't send real barrier bio?

[Ric Wheeler <rwheeler@xxxxxxxxxx>]

Jens Axboe wrote:
> On Wed, Aug 20 2008, Eric Sandeen wrote:
>   
> > Milan Broz wrote:
> >     
> > > Hi,
> > >
> > > I run some barrier tests over device-mapper (which currently doesn't
> > > support barrier bio at all) and even if I set barrier=1 in ext3 mount,
> > > there is never any bio with barrier flag... (in 2.6.27-rc)
> > >
> > > How is the barrier=1 flag supposed to work in ext3 (JBD) now?
> > >       
> > Milan, you're right.  Ric saw this same strange behavior when doing some
> > benchmarking with and without barriers; Chris noticed the change in
> > submit_bh; I was about to write up a similar patch to what you've sent
> > already.  Jens, does Milan's fix look good to you?
> >     
>
> Yep looks good, thanks a lot Milan! I'll send in the patch, unless I'm
> badly mistaken we need it for 2.6.26-stable as well.
>
>   

I think we definitely need it there as well, thanks!

Ric

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