NFSv4.1: Deal effectively with interrupted RPC calls.

If an RPC call is interrupted, assume that the server hasn't processed
the RPC call so that the next time we use the slot, we know that if we
get a NFS4ERR_SEQ_MISORDERED or NFS4ERR_SEQ_FALSE_RETRY, we just have
to bump the sequence number.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4session.h b/fs/nfs/nfs4session.h
index d17b080..6f3cb39 100644
--- a/fs/nfs/nfs4session.h
+++ b/fs/nfs/nfs4session.h
@@ -21,6 +21,7 @@
 	unsigned long		generation;
 	u32			slot_nr;
 	u32		 	seq_nr;
+	unsigned int		interrupted : 1;
 };
 
 /* Sessions */