From: Michael Chang <mchang@suse.com>
Subject: treat mdadm ddf fakeraid as simple device
References: bnc#872360
Patch-Mainline: no

Index: grub-2.02~beta2/grub-core/osdep/linux/getroot.c
===================================================================
--- grub-2.02~beta2.orig/grub-core/osdep/linux/getroot.c
+++ grub-2.02~beta2/grub-core/osdep/linux/getroot.c
@@ -117,7 +117,7 @@ struct btrfs_ioctl_search_args {
                                struct btrfs_ioctl_fs_info_args)
 
 static int
-grub_util_is_imsm (const char *os_dev);
+grub_util_is_imsm_or_ddf (const char *os_dev);
 
 
 #define ESCAPED_PATH_MAX (4 * PATH_MAX)
@@ -603,10 +603,10 @@ out:
 }
 
 static int
-grub_util_is_imsm (const char *os_dev)
+grub_util_is_imsm_or_ddf (const char *os_dev)
 {
   int retry;
-  int is_imsm = 0;
+  int is_imsm_or_ddf = 0;
   int container_seen = 0;
   const char *dev = os_dev;
 
@@ -667,10 +667,17 @@ grub_util_is_imsm (const char *os_dev)
 	  if (strncmp (buf, "MD_METADATA=imsm",
 		       sizeof ("MD_METADATA=imsm") - 1) == 0)
 	    {
-	      is_imsm = 1;
+	      is_imsm_or_ddf = 1;
 	      grub_util_info ("%s is imsm", dev);	      
 	      break;
 	    }
+	  if (strncmp (buf, "MD_METADATA=ddf",
+		       sizeof ("MD_METADATA=ddf") - 1) == 0)
+	    {
+	      is_imsm_or_ddf = 1;
+	      grub_util_info ("%s is ddf", dev);
+	      break;
+	    }
 	}
 
       free (buf);
@@ -681,7 +688,7 @@ grub_util_is_imsm (const char *os_dev)
 
   if (dev != os_dev)
     free ((void *) dev);
-  return is_imsm;
+  return is_imsm_or_ddf;
 }
 
 char *
@@ -1018,7 +1025,7 @@ grub_util_get_dev_abstraction_os (const
 
   /* Check for RAID.  */
   if (!strncmp (os_dev, "/dev/md", 7) && ! grub_util_device_is_mapped (os_dev)
-      && !grub_util_is_imsm (os_dev))
+      && !grub_util_is_imsm_or_ddf (os_dev))
     return GRUB_DEV_ABSTRACTION_RAID;
   return GRUB_DEV_ABSTRACTION_NONE;
 }