150     if (buf->b_ml.ml_mfp == NULL)  in buffer_ensure_loaded()
192 	    if (curbuf->b_ml.ml_mfp != NULL)  in open_buffer()
354 	if (bufref_valid(&old_curbuf) && old_curbuf.br_buf->b_ml.ml_mfp != NULL)  in open_buffer()
771     buf->b_ml.ml_mfp = NULL;  in buf_clear_file()
800     if (buf->b_ml.ml_mfp != NULL)  in buf_freeall()
1348 				   && buf->b_ml.ml_mfp == NULL && !buf->b_p_bl)  in do_buffer_ext()
1438 		    else if (buf->b_ml.ml_mfp == NULL)  in do_buffer_ext()
1476 		    if (buf->b_ml.ml_mfp != NULL)   // found loaded buffer  in do_buffer_ext()
1827     if (curbuf->b_ml.ml_mfp == NULL)	// need to load the file  in enter_buffer()
1945 	&& (curbuf->b_ml.ml_mfp == NULL || BUFEMPTY())  in curbuf_reusable()
3204 			&& (buf->b_ml.ml_mfp == NULL || buf->b_nwindows == 0))  in buflist_list()
3206 			&& (buf->b_ml.ml_mfp == NULL || buf->b_nwindows != 0))  in buflist_list()
3253 		buf->b_ml.ml_mfp == NULL ? ' ' :  in buflist_list()
3375 	    if (obuf->b_ml.ml_mfp != NULL || in_use)  in setfname()
3453     if (buf->b_ml.ml_mfp != NULL)  in buf_name_changed()
5280 	if ((!all && buf->b_ml.ml_mfp == NULL) || !buf->b_p_bl)  in ex_buffer_all()