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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>
This commit is contained in:
Trond Myklebust 2007-11-05 17:42:39 -05:00
parent 67a391d72c
commit 3b948ae5be
2 changed files with 22 additions and 3 deletions
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1
include/linux/sunrpc/xprt.h
View File

@ -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)
{

24
net/sunrpc/xprtsock.c
View File

@ -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();
}
@ -1118,12 +1120,28 @@ 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: