Index: linux-stage/fs/ext4/super.c
===================================================================
--- linux-stage.orig/fs/ext4/super.c	2011-03-11 15:35:15.680343230 +0800
+++ linux-stage/fs/ext4/super.c	2011-03-11 15:44:45.037632078 +0800
@@ -55,6 +55,8 @@
 struct proc_dir_entry *ext4_proc_root;
 static struct kset *ext4_kset;
 
+static int force_over_128tb;
+
 static int ext4_load_journal(struct super_block *, struct ext4_super_block *,
 			     unsigned long journal_devnum);
 static int ext4_commit_super(struct super_block *sb, int sync);
@@ -1494,7 +1496,7 @@
	Opt_stripe, Opt_delalloc, Opt_nodelalloc,
 	Opt_block_validity, Opt_noblock_validity,
 	Opt_inode_readahead_blks, Opt_journal_ioprio,
-	Opt_mballoc, Opt_bigendian_extents,
+	Opt_mballoc, Opt_bigendian_extents, Opt_force_over_128tb,
 	Opt_discard, Opt_nodiscard,
	Opt_init_inode_table, Opt_noinit_inode_table,
 };
@@ -1562,6 +1564,7 @@
 	{Opt_auto_da_alloc, "auto_da_alloc"},
 	{Opt_noauto_da_alloc, "noauto_da_alloc"},
 	{Opt_bigendian_extents, "bigendian_extents"},
+	{Opt_force_over_128tb, "force_over_128tb"},
 	{Opt_mballoc, "mballoc"},
 	{Opt_discard, "discard"},
 	{Opt_nodiscard, "nodiscard"},
@@ -2008,6 +2011,9 @@
 			break;
 		case Opt_mballoc:
 			break;
+		case Opt_force_over_128tb:
+			force_over_128tb = 1;
+			break;
 		default:
 			ext4_msg(sb, KERN_ERR,
 			       "Unrecognized mount option \"%s\" "
@@ -3031,6 +3037,16 @@
 		goto failed_mount;
 	}
 
+	if (ext4_blocks_count(es) > (8ULL << 32)) {
+		if (force_over_128tb == 0) {
+			printk(KERN_ERR "EXT4-fs does not support filesystems "
+			       "greater than 128TB and can cause data corruption."
+			       "Use \"force_over_128tb\" mount option to override."
+			       "\n");
+			goto failed_mount;
+		}
+	}
+
 	if (EXT4_BLOCKS_PER_GROUP(sb) == 0)
 		goto cantfind_ext4;