--- util-linux/volume_id/ext.c.orig	2011-09-15 14:12:38.000000000 +0200
+++ util-linux/volume_id/ext.c	2011-09-15 15:16:24.000000000 +0200
@@ -39,6 +39,10 @@
 	uint8_t	volume_name[16];
 } PACKED;
 
+#define EXT4_FEATURE_INCOMPAT_64BIT		0x0080
+#define EXT4_FEATURE_INCOMPAT_MMP		0x0100
+#define EXT3_FEATURE_INCOMPAT_EXTENTS		0x0040
+
 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL		0x00000004
 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV	0x00000008
 #define EXT_SUPERBLOCK_OFFSET			0x400
@@ -66,6 +70,13 @@
 	dbg("ext: label '%s' uuid '%s'", id->label, id->uuid);
 
 #if ENABLE_FEATURE_BLKID_TYPE
+
+	if ((le32_to_cpu(es->feature_incompat) & EXT3_FEATURE_INCOMPAT_EXTENTS) != 0 ||
+	    (le32_to_cpu(es->feature_incompat) & EXT4_FEATURE_INCOMPAT_64BIT) != 0 ||
+	    (le32_to_cpu(es->feature_incompat) & EXT4_FEATURE_INCOMPAT_MMP) != 0)
+		id->type = "ext4";
+	else
+
 	if ((le32_to_cpu(es->feature_compat) & EXT3_FEATURE_COMPAT_HAS_JOURNAL) != 0)
 		id->type = "ext3";
 	else