N-way mirror read speedup in zfsonlinux

[Steven Hartland]

----- Original Message ----- 
From: "Steven Hartland"
> I've updated my version with your changes along with extracting our
> the mm structure to a simple inline used in both routes.
> 
> It would be good to understand why we cant set the offset in vdev_queue_io as
> having call vdev_queue_register_lastoffset multiple times is a bit messy.
> 
> FYI: I'm away for a week now so may not be able to read emails as much as usual
> so if there's a delay replying thats why.

Latest version of the patch attached.

Justin was looking to see if he can make the update of the vq_lastoffset
generic without impacting performance, but appart from that there are no
outstanding feedback which hasn't been addressed.

@Justin any joy? If not, do you think your going to have any time soon to
investigate or should I look to commit this as is?

In terms of testing we put this through its paces on our steam proxy box
last weekend and pushed well over 10TB through it with no issues :)

    Regards
    Steve

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