Re: [PATCH]: xen/blkback: Add support for old BARRIER requests -'feature-barrier', was "Help with implementing some form of barriers in 3.0kernels."

From: Christoph Hellwig
Date: Thu Sep 15 2011 - 11:16:24 EST


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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