This allows XFS to perform zeroing using the iomap infrastructure and
avoid buffer heads.
Reviewed-by: NJan Kara <jack@suse.cz>
Signed-off-by: NChristoph Hellwig <hch@lst.de>
[vishal: fix conflicts with dax-error-handling]
Signed-off-by: NVishal Verma <vishal.l.verma@intel.com>