1121     if (curbuf->b_ml.ml_mfp == NULL)  in prepare_buffer()
1239 		if (buf->b_ml.ml_mfp == NULL)  in channel_set_options()
1285 		if (buf->b_ml.ml_mfp == NULL)  in channel_set_options()
1481 			    in_part->ch_bufref.br_buf->b_ml.ml_line_count + 1;  in channel_set_job()
1491 	    in_part->ch_buf_bot = in_part->ch_bufref.br_buf->b_ml.ml_line_count;  in channel_set_job()
1632     if (!bufref_valid(&in_part->ch_bufref) || buf->b_ml.ml_mfp == NULL)  in channel_write_in()
1641 				   && lnum <= buf->b_ml.ml_line_count; ++lnum)  in channel_write_in()
1655     if (lnum > buf->b_ml.ml_line_count || lnum > in_part->ch_buf_bot)  in channel_write_in()
1672 				   (long)(buf->b_ml.ml_line_count - lnum + 1));  in channel_write_in()
1751 	    for (lnum = in_part->ch_buf_bot; lnum < buf->b_ml.ml_line_count;  in channel_write_new_lines()
1764 	    if (lnum < buf->b_ml.ml_line_count)  in channel_write_new_lines()
1766 				       (long)(buf->b_ml.ml_line_count - lnum));  in channel_write_new_lines()
2630     linenr_T    lnum = buffer->b_ml.ml_line_count;  in append_to_buffer()
2634     int		empty = (buffer->b_ml.ml_flags & ML_EMPTY) ? 1 : 0;  in append_to_buffer()
2700 		if (move_cursor || wp->w_topline > buffer->b_ml.ml_line_count)  in append_to_buffer()
2730 		in_part->ch_buf_bot = buffer->b_ml.ml_line_count;  in append_to_buffer()
2784 					       || buffer->b_ml.ml_mfp == NULL))  in may_invoke_callback()