Index: linux-2.6.27.21-0.1/fs/ext4/super.c
===================================================================
--- linux-2.6.27.21-0.1.orig/fs/ext4/super.c
+++ linux-2.6.27.21-0.1/fs/ext4/super.c
@@ -52,6 +52,8 @@
 
 struct proc_dir_entry *ext4_proc_root;
 
+static int force_over_8tb;
+
 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
 			     unsigned long journal_devnum);
 static int ext4_create_journal(struct super_block *, struct ext4_super_block *,
@@ -1295,7 +1297,7 @@ enum {
 	Opt_stripe, Opt_delalloc, Opt_nodelalloc,
 	Opt_inode_readahead_blks, Opt_bigendian_extents,
 	Opt_iopen, Opt_noiopen, Opt_iopen_nopriv,
-	Opt_mballoc
+	Opt_mballoc, Opt_force_over_8tb
 };
 
 static match_table_t tokens = {
@@ -1358,6 +1360,7 @@ static match_table_t tokens = {
 	{Opt_inode_readahead_blks, "inode_readahead_blks=%u"},
 	{Opt_bigendian_extents, "bigendian_extents"},
 	{Opt_mballoc, "mballoc"},
+	{Opt_force_over_8tb, "force_over_8tb"},
 	{Opt_err, NULL},
 };
 
@@ -1778,6 +1781,9 @@ set_qf_format:
 			break;
 		case Opt_mballoc:
 			break;
+		case Opt_force_over_8tb:
+			force_over_8tb = 1;
+			break;
 		default:
 			printk(KERN_ERR
 			       "EXT4-fs: Unrecognized mount option \"%s\" "
@@ -2639,6 +2645,17 @@ static int ext4_fill_super(struct super_
 		goto failed_mount;
 	}
 
+	if (ext4_blocks_count(es) >
+	    ((0x80000000000ULL >> sb->s_blocksize_bits) - 1)) {
+		if (force_over_8tb == 0) {
+			printk(KERN_ERR "EXT4-fs does not support filesystems "
+			       "greater than 8TB and can cause data corruption."
+			       "Use \"force_over_8tb\" mount option to override."
+			       "\n");
+			goto failed_mount;
+		}
+	}
+
 	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
 		goto cantfind_ext4;