xfs_refcount_decrease_extent
xfs_refcount_decrease_extent(tp, isrt, del);
void xfs_refcount_decrease_extent(struct xfs_trans *tp, bool isrt,
xfs_refcount_decrease_extent(tp, isrt, &smap);
xfs_refcount_decrease_extent(tp, isrt, &data);
xfs_refcount_decrease_extent(tp, true, &data);