Index: linux-2.6.16.27-0.9-full/include/linux/ext3_fs_i.h
===================================================================
--- linux-2.6.16.27-0.9-full.orig/include/linux/ext3_fs_i.h	2007-03-28 16:03:20.000000000 +0400
+++ linux-2.6.16.27-0.9-full/include/linux/ext3_fs_i.h	2007-03-28 19:40:53.000000000 +0400
@@ -139,6 +139,8 @@ struct ext3_inode_info {
 	/* mballoc */
 	struct list_head i_prealloc_list;
 	spinlock_t i_prealloc_lock;
+
+	void *i_filterdata;
 };
 
 #endif	/* _LINUX_EXT3_FS_I */
Index: linux-2.6.16.27-0.9-full/fs/ext3/super.c
===================================================================
--- linux-2.6.16.27-0.9-full.orig/fs/ext3/super.c	2007-03-28 18:20:17.000000000 +0400
+++ linux-2.6.16.27-0.9-full/fs/ext3/super.c	2007-03-28 19:40:53.000000000 +0400
@@ -462,6 +462,7 @@ static struct inode *ext3_alloc_inode(st
 	memset(&ei->i_cached_extent, 0, sizeof(ei->i_cached_extent));
 	INIT_LIST_HEAD(&ei->i_prealloc_list);
 	spin_lock_init(&ei->i_prealloc_lock);
+	ei->i_filterdata = NULL;
 	return &ei->vfs_inode;
 }