On Mon, 2011-09-12 at 12:56 +0100, Mel Gorman wrote:

I took a look at what was involved with doing the block lookups in
ext4. It's what led to patch 4 of this series because it was necessary that
the filesystem get the same information as the generic handler. It got a
bit messy but looked like it would have worked if I kept at it. I stopped
because I did nt see a major advantage with swap_writepage() looking up
the block map instead of having looked it up in advance with bmap() but
I could have missed something.

IIRC the filesystem folks don't like the bmap thing and would like it to
go away.. could be they changed their minds again though, who knows ;-)


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