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From: Stephen Hemminger <shemminger@vyatta.com>
Subject: unionfs on RT
Date: Fri, 7 Nov 2008 13:47:35 -0800
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commit 192308315fdc06659a43d5011d9be76eb2520579
Author: Stephen Hemminger <stephen.hemminger@vyatta.com>
Date:   Fri Oct 31 14:17:17 2008 -0700

    Fix unionfs on RT
    
    RT changes inode stucture slightly.

diff --git a/fs/unionfs/super.c b/fs/unionfs/super.c
index 5fa4253..6f384e7 100644
--- a/fs/unionfs/super.c
+++ b/fs/unionfs/super.c
@@ -92,7 +92,7 @@ static void unionfs_delete_inode(struct inode *inode)
 	spin_unlock(&inode->i_lock);
 #endif
 
-	if (inode->i_data.nrpages)
+	if (mapping_nrpages(&inode->i_data))
 		truncate_inode_pages(&inode->i_data, 0);
 
 	clear_inode(inode);