On Wed, Sep 28, 2016 at 02:55:50PM +1000, Dave Chinner wrote:

On Tue, Sep 27, 2016 at 07:08:42PM -0700, Christoph Hellwig wrote:

quoted

On Tue, Sep 27, 2016 at 02:47:51PM -0600, Ross Zwisler wrote:

quoted

DAX PMDs have been disabled since Jan Kara introduced DAX radix tree based
locking.  This series allows DAX PMDs to participate in the DAX radix tree
based locking scheme so that they can be re-enabled.

Jan and Christoph, can you please help review these changes?

About to get on a plane, so it might take a bit to do a real review.
In general this looks fine, but I guess the first two ext4 patches
should just go straight to Ted independent of the rest?

Also Jan just posted a giant DAX patchbomb, we'll need to find a way
to integrate all that work, and maybe prioritize things if we want
to get bits into 4.9 still.

I'm not going to have time to do much review or testing of the DAX
changes (apart from the cursor comments I've already made) because
of the huge pile of XFS reflink changes I've got ot get through
first. However, I've already got the iomap dax bits in the XFS tree
so I can pull everything through there if review and testing is
covered otherwise......

Frankly I'd love it if my changes could make it into v4.9 through the XFS
tree.  They've passed xfstests both with and without DAX, and they've passed
all the targeted testing I've been able to throw at them.  If that works, we
can integrate Jan's changes on top of them during the v4.9 cycle and merge for
v4.10.

I'll work on incorporating changes for your feedback, Dave, and hopefully have
a v4 out by the end of the day.