rfs_pathname
error = rfs_pathname(p, &mc_dvp, vpp, dvp, cr, pathflag);
error = rfs_pathname(p, NULL, vpp, dvp, cr, pathflag);
error = rfs_pathname((*exi)->exi_export.ex_index, NULL, vpp,
extern int rfs_pathname(char *, vnode_t **, vnode_t **, vnode_t *,