On Thu, Nov 24, 2016 at 10:46:35AM +0100, Jan Kara wrote:
> Currently ->iomap_begin() handler is called with entry lock held. If the
> filesystem held any locks between ->iomap_begin() and ->iomap_end()
> (such as ext4 which will want to hold transaction open), this would cause
> lock inversion with the iomap_apply() from standard IO path which first
> calls ->iomap_begin() and only then calls ->actor() callback which grabs
> entry locks for DAX.

I don't see the dax_iomap_actor() grabbing any entry locks for DAX?  Is this
an issue currently, or are you just trying to make the code consistent so we
don't run into issues in the future?
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