--- geometry.c	Fri Jun 20 08:24:52 1997
+++ ../geometry.c	Thu Aug 13 00:19:02 1998
@@ -2,7 +2,9 @@
 
 /* Copyright 1992-1997 Werner Almesberger. See file COPYING for details. */
 
+/* modified by mrs.brisby@nimh.org to support MD devices */
 
+#include <ctype.h>
 #include <unistd.h>
 #include <stdio.h>
 #include <string.h>
@@ -257,6 +259,58 @@
 #endif
 }
 
+/* mrs.brisby@nimh.org */
+static void geo_query_dev(GEOMETRY *geo,int device,int all);
+static int geo_lookup_mtab_loop(GEOMETRY *geo, int device, int all)
+{
+	static int displayed_warning = 0;
+	FILE *fp;
+	struct stat st;
+	char line[256], *a, *b, *c;
+
+	if (device & 0x0900) {
+		fp = fopen("/etc/mdtab", "r");
+		while (fgets(line, 255, fp)) {
+			a = line;
+			b = strpbrk(a, " \t");
+			if (b) {
+				*b = 0;
+				b++;
+				while (isspace(*b)) b++;
+			} else
+				continue;
+			c = strpbrk(b, " \t");
+			if (c) {
+				*c = 0;
+				c++;
+				while (isspace(*c)) c++;
+			} else
+				continue;
+			if (stat(a, &st))
+				continue;
+			if (strncmp(b, "raid1", 5) == 0 && st.st_rdev == device) {
+				b = strpbrk(c, " \t");
+				if (b)
+					*b = 0;
+				if (stat(c, &st))
+					continue;
+				fclose(fp);
+				geo_query_dev(geo, st.st_rdev, all);
+				if (!displayed_warning)
+					fprintf(stderr, "Warning: you should run /sbin/ckraid immediatly.\n");
+				displayed_warning = 1;
+				return 1;
+			} else if (st.st_rdev == device) {
+				c = strchr(b, ',');
+				if (c)
+					*c = 0;
+				die("MD personality `%s' unsupported", b);
+			}
+		}
+		fclose(fp);
+	}
+	return 0;
+}
 
 static void geo_query_dev(GEOMETRY *geo,int device,int all)
 {
@@ -320,7 +374,9 @@
 	    geo->start = hdprm.start;
 	    break;
 	default:
-	    die("Sorry, don't know how to handle device 0x%04x",device);
+	    /* mrs.brisby@nimh.org */
+	    if (!geo_lookup_mtab_loop(geo, device, all))
+		die("Sorry, don't know how to handle device 0x%04x",device);
     }
     if (get_all) dev_close(&dev);
     if (!nowarn && (geo->device & 0x7f) >= BIOS_MAX_DEVS)