Index: e2fsprogs-1.39-tyt3-v7/misc/mke2fs.c
===================================================================
--- e2fsprogs-1.39-tyt3-v7.orig/misc/mke2fs.c	2007-06-21 13:16:34.000000000 +0200
+++ e2fsprogs-1.39-tyt3-v7/misc/mke2fs.c	2007-06-21 13:16:47.000000000 +0200
@@ -1273,6 +1273,17 @@ static void PRS(int argc, char *argv[])
 				  ));
 				exit(1);
 			}
+			if (dev_size > ((unsigned) 1 << 31) &&
+				desc_size < EXT2_MIN_DESC_SIZE_64BIT) {
+				fprintf(stderr, _("\nWarning: "
+				"Filesystem greater than 2**32 blocks.\n"
+				"Force 64-bit incompatible feature ?\n\n"));
+				proceed_question();
+				fs_param.s_feature_incompat |=
+					EXT4_FEATURE_INCOMPAT_64BIT;
+				fs_param.s_desc_size =
+					EXT2_MIN_DESC_SIZE_64BIT;
+			}
 			EXT2_BLOCKS_COUNT_SET(&fs_param, dev_size);
 			if (sys_page_size > EXT2_BLOCK_SIZE(&fs_param))
 				fs_param.s_blocks_count &= ~((sys_page_size /
@@ -1445,7 +1456,8 @@ static void PRS(int argc, char *argv[])
 		fs_param.s_desc_size = EXT2_MIN_DESC_SIZE_64BIT;
 	}
 
-	if (!force && EXT2_BLOCKS_COUNT(&fs_param) >= ((unsigned) 1 << 31)) {
+	if (!force && (fs_param.s_desc_size < EXT2_MIN_DESC_SIZE_64BIT)
+		&& EXT2_BLOCKS_COUNT(&fs_param) >= ((unsigned) 1 << 31)) {
 		com_err(program_name, 0,
 			_("Filesystem too large.  No more than 2**31-1 blocks\n"
 			  "\t (8TB using a blocksize of 4k) are currently supported."));
Index: e2fsprogs-1.39-tyt3-v7/lib/ext2fs/ext2fs.h
===================================================================
--- e2fsprogs-1.39-tyt3-v7.orig/lib/ext2fs/ext2fs.h	2007-06-21 13:16:45.000000000 +0200
+++ e2fsprogs-1.39-tyt3-v7/lib/ext2fs/ext2fs.h	2007-06-21 13:16:47.000000000 +0200
@@ -73,7 +73,12 @@ extern "C" {
 #endif /* EXT2_FLAT_INCLUDES */
 
 typedef __u32		ext2_ino_t;
+#ifdef _EXT4FS_
+#define _EXT2_64BIT_BLK_T	1
+typedef __u64		blk_t;
+#else
 typedef __u32		blk_t;
+#endif
 typedef __u64		blk64_t;
 typedef __u32		dgrp_t;
 typedef __u32		ext2_off_t;
@@ -491,13 +496,15 @@ struct ext2fs_extent {
 					 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV|\
 					 EXT2_FEATURE_INCOMPAT_META_BG|\
 					 EXT3_FEATURE_INCOMPAT_RECOVER|\
-					 EXT3_FEATURE_INCOMPAT_EXTENTS)
+					 EXT3_FEATURE_INCOMPAT_EXTENTS|\
+					 EXT4_FEATURE_INCOMPAT_64BIT)
 #else
 #define EXT2_LIB_FEATURE_INCOMPAT_SUPP	(EXT2_FEATURE_INCOMPAT_FILETYPE|\
 					 EXT3_FEATURE_INCOMPAT_JOURNAL_DEV|\
 					 EXT2_FEATURE_INCOMPAT_META_BG|\
 					 EXT3_FEATURE_INCOMPAT_RECOVER|\
-					 EXT3_FEATURE_INCOMPAT_EXTENTS)
+					 EXT3_FEATURE_INCOMPAT_EXTENTS|\
+					 EXT4_FEATURE_INCOMPAT_64BIT)
 #endif
 #define EXT2_LIB_FEATURE_RO_COMPAT_SUPP	(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER|\
 					 EXT2_FEATURE_RO_COMPAT_LARGE_FILE)
@@ -1263,7 +1270,7 @@ _INLINE_ int ext2fs_group_of_ino(ext2_fi
 _INLINE_ blk_t ext2fs_group_first_block(ext2_filsys fs, dgrp_t group)
 {
 	return fs->super->s_first_data_block +
-		(group * fs->super->s_blocks_per_group);
+		(group * (blk_t) EXT2_BLOCKS_PER_GROUP(fs->super));
 }
 
 /*
@@ -1274,7 +1281,7 @@ _INLINE_ blk_t ext2fs_group_last_block(e
 	return (group == fs->group_desc_count - 1 ?
 		EXT2_BLOCKS_COUNT(fs->super) - 1 :
 		ext2fs_group_first_block(fs, group) +
-			(fs->super->s_blocks_per_group - 1));
+			(EXT2_BLOCKS_PER_GROUP(fs->super) - 1));
 }
 
 _INLINE_ blk_t ext2fs_inode_data_blocks(ext2_filsys fs,
Index: e2fsprogs-1.39-tyt3-v7/lib/ext2fs/ext2_fs.h
===================================================================
--- e2fsprogs-1.39-tyt3-v7.orig/lib/ext2fs/ext2_fs.h	2007-06-21 13:15:40.000000000 +0200
+++ e2fsprogs-1.39-tyt3-v7/lib/ext2fs/ext2_fs.h	2007-06-21 13:16:47.000000000 +0200
@@ -678,7 +678,8 @@ struct ext2_super_block {
 
 
 #define EXT2_FEATURE_COMPAT_SUPP	0
-#define EXT2_FEATURE_INCOMPAT_SUPP	(EXT2_FEATURE_INCOMPAT_FILETYPE)
+#define EXT2_FEATURE_INCOMPAT_SUPP	(EXT2_FEATURE_INCOMPAT_FILETYPE| \
+					 EXT4_FEATURE_INCOMPAT_64BIT)
 #define EXT2_FEATURE_RO_COMPAT_SUPP	(EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
 					 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
 					 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)