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 <Trond.Myklebust@netapp.com>
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@ -257,6 +257,7 @@ void xprt_force_disconnect(struct rpc_xprt *xprt);
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#define XPRT_CLOSE_WAIT (3)
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#define XPRT_BOUND (4)
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#define XPRT_BINDING (5)
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#define XPRT_CLOSING (6)
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static inline void xprt_set_connected(struct rpc_xprt *xprt)
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{
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@ -758,7 +758,9 @@ static void xs_close(struct rpc_xprt *xprt)
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sock_release(sock);
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clear_close_wait:
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smp_mb__before_clear_bit();
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clear_bit(XPRT_CONNECTED, &xprt->state);
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clear_bit(XPRT_CLOSE_WAIT, &xprt->state);
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clear_bit(XPRT_CLOSING, &xprt->state);
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smp_mb__after_clear_bit();
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}
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@ -1118,12 +1120,28 @@ static void xs_tcp_state_change(struct sock *sk)
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}
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spin_unlock_bh(&xprt->transport_lock);
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break;
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case TCP_SYN_SENT:
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case TCP_SYN_RECV:
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case TCP_FIN_WAIT1:
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/* The client initiated a shutdown of the socket */
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set_bit(XPRT_CLOSING, &xprt->state);
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smp_mb__before_clear_bit();
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clear_bit(XPRT_CONNECTED, &xprt->state);
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smp_mb__after_clear_bit();
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break;
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case TCP_CLOSE_WAIT:
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/* The server initiated a shutdown of the socket */
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set_bit(XPRT_CLOSING, &xprt->state);
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xprt_force_disconnect(xprt);
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default:
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break;
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case TCP_LAST_ACK:
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smp_mb__before_clear_bit();
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clear_bit(XPRT_CONNECTED, &xprt->state);
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smp_mb__after_clear_bit();
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break;
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case TCP_CLOSE:
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smp_mb__before_clear_bit();
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clear_bit(XPRT_CLOSING, &xprt->state);
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smp_mb__after_clear_bit();
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/* Mark transport as closed and wake up all pending tasks */
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xprt_disconnect(xprt);
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}
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out:
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