Re: Write barriers on MD RAID1

[Neil Brown]

On Sunday June 21, ken.milmore@xxxxxxxxxxxxxx wrote:
> I thought I had better bump my previous post as this regression is still 
> present in 2.6.29.5.

Thanks Ken.

> 
> To recap, commit cec0707e40ae25794b5a2de7b7f03c51961f80d9 has broken 
> write barriers on md raid1 block devices in 2.6.29 and later kernels. 
> Reversing this commit appears to fix the problem.
> 
> Please let me know if I'm harassing the wrong maintainers here!

Jens,
  have you had a chance to look at this?

I think the following patch is appropriate and should go in to
-stable.

Thanks,
NeilBrown