xfs_iext_valid
if (!xfs_iext_valid(ifp, cur))
if (ifp->if_height > 1 && !xfs_iext_valid(ifp, cur) &&
if (xfs_iext_valid(ifp, cur))
ASSERT(xfs_iext_valid(ifp, cur));
if (!xfs_iext_valid(ifp, cur))