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

    Jens Axboe

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