All defer op instance place their own extension of the log item into
the dfp_intent field.  Replace that with a xfs_log_item to improve type
safety and make the code easier to follow.
Signed-off-by: NChristoph Hellwig <hch@lst.de>
Reviewed-by: NBrian Foster <bfoster@redhat.com>
Reviewed-by: NDarrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com>