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SubjectRe: [PATCH]: xen/blkback: Add support for old BARRIER requests - 'feature-barrier', was "Help with implementing some form of barriers in 3.0 kernels."
Btw, I'm really against exporting any of the low-level request/elevator
code interfaces. I have plans for huge changes in that area, and having
someone poke into it is just a bad idea.

Try to take a look at the barrier era dm implementation of them, which
did the draining on the bio layer and copy & paste that.



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