nfsd4: use callbacks on svc_xprt_deletion

Remove connections from the list when they go down.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 29413c2..8d5e237 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -35,6 +35,7 @@
 #ifndef _NFSD4_STATE_H
 #define _NFSD4_STATE_H
 
+#include <linux/sunrpc/svc_xprt.h>
 #include <linux/nfsd/nfsfh.h>
 #include "nfsfh.h"
 
@@ -155,6 +156,8 @@
 struct nfsd4_conn {
 	struct list_head cn_persession;
 	struct svc_xprt *cn_xprt;
+	struct svc_xpt_user cn_xpt_user;
+	struct nfsd4_session *cn_session;
 /* CDFC4_FORE, CDFC4_BACK: */
 	unsigned char cn_flags;
 };