On Fri, 2011-09-09 at 09:36 -0400, Christoph Hellwig wrote:
> The equivalent of ->direct_IO should be used for both reads and writes.
So the difference between DIO and swapIO is that swapIO needs the block
map pinned in memory.. So at the very least you'll need those
swap_{activate,deactivate} aops. The read/write-page thingies could
indeed be shared with DIO.
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