The conclusion of the 3.9 merge window

Have you benchmarked bcache vs dm-cache vs enhanceio? If so I'd love to see what you found. We have an "all-caches" branch here:
https://github.com/jthornber/linux-2.6/tree/all-caches

But we definitely need to definitely update the bcache and enhanceio code.

Also, please note that there are some dm-cache fixes that will likely be sent to Linus for 3.9-rc2 that Alasdair (DM maintainer) has staged here: http://people.redhat.com/agk/patches/linux/editing/series...