--- ubd.c~	Mon May  6 10:42:56 2002
+++ ubd.c.2	Mon May  6 10:46:06 2002
@@ -720,7 +720,22 @@
 		end_request(0);
 		return(1);
 	}
-
+	if(!dev->count) {
+		if (dev->file) {
+			if(ubd_open_dev(dev) < 0){
+				printk(KERN_ERR "unable to open %s for validation\n",
+				       dev->file);
+				return 1;
+			}
+		} else  return 1;
+		
+		/* have to recompute sizes since we opened it */
+		err = ubd_file_size(dev, &dev->size);
+		if(err) {
+			ubd_close(dev);
+			return 1;
+		}
+	}
         req->sector += ubd_part[minor].start_sect;
         block = req->sector;
         nsect = req->current_nr_sectors;