diff -Naur drbd-8.3.1/drbd/drbd_wrappers.h drbd-8.3.1-fix-BDI_write_congested/drbd/drbd_wrappers.h
--- drbd-8.3.1/drbd/drbd_wrappers.h	2009-03-26 15:58:33.000000000 +0100
+++ drbd-8.3.1-fix-BDI_write_congested/drbd/drbd_wrappers.h	2009-05-11 16:10:21.836674009 +0200
@@ -55,6 +55,10 @@
 	return 0;
 }
 
+#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,29)
+#define BDI_write_congested BDI_async_congested
+#endif
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,24)
 /* Before Linux-2.6.24 bie_endio() had the size of the bio as second argument.
    See 6712ecf8f648118c3363c142196418f89a510b90 */