Adapted for 2.6.38 from http://www.fsl.cs.sunysb.edu/pipermail/unionfs/2011-March/006088.html

--- fs/unionfs/inode.c.orig	2011-03-29 09:19:23.477166008 +0200
+++ fs/unionfs/inode.c	2011-03-29 09:22:02.267303281 +0200
@@ -936,7 +936,8 @@ static int unionfs_setattr(struct dentry
 		err = -EINVAL;
 		goto out;
 	}
-	lower_inode = unionfs_lower_inode(inode);
+	lower_inode = lower_dentry->d_inode;
+	BUG_ON(!lower_inode);
 
 	/* check if user has permission to change lower inode */
 	err = inode_change_ok(lower_inode, ia);
@@ -970,7 +971,9 @@ static int unionfs_setattr(struct dentry
 			goto out;
 		/* get updated lower_dentry/inode after copyup */
 		lower_dentry = unionfs_lower_dentry(dentry);
-		lower_inode = unionfs_lower_inode(inode);
+		BUG_ON(!lower_inode);
+		lower_inode = lower_dentry->d_inode;
+		BUG_ON(!lower_inode);
 	}
 
 	/*