[PATCH 4/6] fs: add iomap_file_dirty

[Christoph Hellwig]

On Thu, Aug 25, 2016 at 04:31:07PM -0700, Christoph Hellwig wrote:
> Originally-from: Christoph Hellwig <hch at lst.de>

This should be a

From: Christoph Hellwig <hch at lst.de>

so that git picks up authorship information correctly.

> XXX: might want a bigger name, and possible a better implementation
> that doesn't require two lookups in the radix tree.

And these need to be looked into.  I can take a stab at it, but I need
to get a few other things off my plate first.