Index: linux-2.6.32-71.18.1.el6/fs/dcache.c
===================================================================
--- linux-2.6.32-71.18.1.el6.orig/fs/dcache.c
+++ linux-2.6.32-71.18.1.el6/fs/dcache.c
@@ -280,6 +280,13 @@ int d_invalidate(struct dentry * dentry)
 		spin_unlock(&dcache_lock);
 		return 0;
 	}
+
+	/* network invalidation by Lustre */
+	if (dentry->d_flags & DCACHE_LUSTRE_INVALID) {
+		spin_unlock(&dcache_lock);
+		return 0;
+	}
+
 	/*
 	 * Check whether to do a partial shrink_dcache
 	 * to get rid of unused child entries.
Index: linux-2.6.32-71.18.1.el6/include/linux/dcache.h
===================================================================
--- linux-2.6.32-71.18.1.el6.orig/include/linux/dcache.h
+++ linux-2.6.32-71.18.1.el6/include/linux/dcache.h
@@ -185,6 +185,7 @@ d_iput:		no		no		no       yes
 #define DCACHE_MANAGE_TRANSIT	0x40000	/* manage transit from this dirent */
 #define DCACHE_MANAGED_DENTRY \
 	(DCACHE_MOUNTED|DCACHE_NEED_AUTOMOUNT|DCACHE_MANAGE_TRANSIT)
+#define DCACHE_LUSTRE_INVALID	0x4000000  /* Lustre invalidated */
 
 extern spinlock_t dcache_lock;
 extern seqlock_t rename_lock;