Re: 2.6.15-mm2

[Reuben Farrelly]

On 12/01/2006 3:55 a.m., Jens Axboe wrote:
> On Wed, Jan 11 2006, Jens Axboe wrote:
> > It's not too tricky, you just need to correct that function prototype.
> > Could you do that? Would be nice to know _exactly_ which libata
> > changeset caused this malfunction. But it does of course point at the
> > barrier changes for scsi/libata...
>
> You can also try something quicker - use a newer kernel known to exhibit
> the problem, and apply this patch on top of that:
>
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index 0302723..720ace4 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -436,6 +436,7 @@ void md_super_write(mddev_t *mddev, mdk_
>  	bio->bi_rw = rw;
>  
>  	atomic_inc(&mddev->pending_writes);
> +#if 0
>  	if (!test_bit(BarriersNotsupp, &rdev->flags)) {
>  		struct bio *rbio;
>  		rw |= (1<<BIO_RW_BARRIER);
> @@ -444,6 +445,7 @@ void md_super_write(mddev_t *mddev, mdk_
>  		rbio->bi_end_io = super_written_barrier;
>  		submit_bio(rw, rbio);
>  	} else
> +#endif
>  		submit_bio(rw, bio);
>  }

...and with that patch, I can now boot up 2.6.15-mm3 (repeated twice).  So yes, 
looks like that's where the problem lies.

Thanks Jens,
Reuben

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