[PATCH 03/12] fs/dax: Refactor wait for dax idle page

[Dan Williams]

Alistair Popple wrote:
> A FS DAX page is considered idle when its refcount drops to one. This
> is currently open-coded in all file systems supporting FS DAX. Move
> the idle detection to a common function to make future changes easier.
> 
> Signed-off-by: Alistair Popple <apopple at nvidia.com>
> Reviewed-by: Jan Kara <jack at suse.cz>
> Reviewed-by: Christoph Hellwig <hch at lst.de>

Looks good to me:

Reviewed-by: Dan Williams <dan.j.williams at intel.com>