xfs_iext_leaf_key
node->keys[0] = xfs_iext_leaf_key(prev, 0);
xfs_iext_update_node(ifp, xfs_iext_leaf_key(cur->leaf, 0),
xfs_iext_insert_node(ifp, xfs_iext_leaf_key(new, 0), new, 2);
offset = xfs_iext_leaf_key(leaf->next, 0);
xfs_fileoff_t offset = xfs_iext_leaf_key(leaf, 0);
xfs_iext_update_node(ifp, offset, xfs_iext_leaf_key(leaf, 0), 1,
offset = xfs_iext_leaf_key(leaf, 0);