From: Trond Myklebust Date: Mon, 5 Nov 2007 17:42:39 -0500 SUNRPC: Allow the client to detect if the TCP connection is closed Add an xprt->state bit to enable the TCP ->state_change() method to signal whether or not the TCP connection is in the process of closing down. This will to be used by the reconnection logic in a separate patch. Signed-off-by: Trond Myklebust --- include/linux/sunrpc/xprt.h | 1 + net/sunrpc/xprtsock.c | 24 +++++++++++++++++++++--- 2 files changed, 22 insertions(+), 3 deletions(-) diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h index 6f524a9..afb9e6a 100644 --- a/include/linux/sunrpc/xprt.h +++ b/include/linux/sunrpc/xprt.h @@ -257,6 +257,7 @@ void xprt_force_disconnect(struct rpc_xprt *xprt); #define XPRT_CLOSE_WAIT (3) #define XPRT_BOUND (4) #define XPRT_BINDING (5) +#define XPRT_CLOSING (6) static inline void xprt_set_connected(struct rpc_xprt *xprt) { diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 45cb1dc..607f233 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -758,7 +758,9 @@ static void xs_close(struct rpc_xprt *xprt) sock_release(sock); clear_close_wait: smp_mb__before_clear_bit(); + clear_bit(XPRT_CONNECTED, &xprt->state); clear_bit(XPRT_CLOSE_WAIT, &xprt->state); + clear_bit(XPRT_CLOSING, &xprt->state); smp_mb__after_clear_bit(); } @@ -1114,12 +1116,28 @@ static void xs_tcp_state_change(struct sock *sk) } spin_unlock_bh(&xprt->transport_lock); break; - case TCP_SYN_SENT: - case TCP_SYN_RECV: + case TCP_FIN_WAIT1: + /* The client initiated a shutdown of the socket */ + set_bit(XPRT_CLOSING, &xprt->state); + smp_mb__before_clear_bit(); + clear_bit(XPRT_CONNECTED, &xprt->state); + smp_mb__after_clear_bit(); break; case TCP_CLOSE_WAIT: + /* The server initiated a shutdown of the socket */ + set_bit(XPRT_CLOSING, &xprt->state); xprt_force_disconnect(xprt); - default: + break; + case TCP_LAST_ACK: + smp_mb__before_clear_bit(); + clear_bit(XPRT_CONNECTED, &xprt->state); + smp_mb__after_clear_bit(); + break; + case TCP_CLOSE: + smp_mb__before_clear_bit(); + clear_bit(XPRT_CLOSING, &xprt->state); + smp_mb__after_clear_bit(); + /* Mark transport as closed and wake up all pending tasks */ xprt_disconnect(xprt); } out: