My apologies for the confusion here. Some of these patches are indeed duplicates of each other. I had run git format-patch, then noticed a mistake, edited the patch set and ran git format-patch again without emptying the directory of patches, so I ended up sending 36 emails instead of 29.
There were also a couple of small bugs caught by 0day and an infelicity in the rxrpc code pointed out by Dave Howells. Instead of spamming you all with another 29 emails, the latest version of the patchset can be found here: http://git.infradead.org/users/willy/linux-dax.git/shortlog/refs/heads/idr-2016-11-17
