devnull->ops.write_page = __null_wr_pg;
devnull->ops.write = __null_wr;
devnull->ops.read_page = __null_rd_pg;
devnull->ops.read = __null_rd;
devnull->ops.write_page = __null_wr_pg;
devnull->ops.write = __null_wr;
devnull->ops.read_page = __null_rd_pg;
devnull->ops.read = __null_rd;