udf_write_logvol_dscr
error = udf_write_logvol_dscr(udf_node, dscr, loc, 0);
error = udf_write_logvol_dscr(udf_node, dscr, loc, waitfor);
int udf_write_logvol_dscr(struct udf_node *udf_node, union dscrptr *dscr,