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SUNRPC: Remove TCP client connection reset hack

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Instead we rely on SO_REUSEPORT to provide the reconnection semantics
that we need for NFSv2/v3.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2015-02-08 15:34:28 -05:00
parent de84d89030
commit 4efdd92c92
2 changed files with 1 additions and 67 deletions
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1
include/linux/sunrpc/xprt.h
View File

@ -363,7 +363,6 @@ void xprt_unlock_connect(struct rpc_xprt *, void *);
#define XPRT_CONNECTION_ABORT (7) #define XPRT_CONNECTION_ABORT (7)
#define XPRT_CONNECTION_CLOSE (8) #define XPRT_CONNECTION_CLOSE (8)
#define XPRT_CONGESTED (9) #define XPRT_CONGESTED (9)
#define XPRT_CONNECTION_REUSE (10)
static inline void xprt_set_connected(struct rpc_xprt *xprt) static inline void xprt_set_connected(struct rpc_xprt *xprt)
{ {

67
net/sunrpc/xprtsock.c
View File

@ -796,8 +796,6 @@ static void xs_error_report(struct sock *sk)
dprintk("RPC: xs_error_report client %p, error=%d...\n", dprintk("RPC: xs_error_report client %p, error=%d...\n",
xprt, -err); xprt, -err);
trace_rpc_socket_error(xprt, sk->sk_socket, err); trace_rpc_socket_error(xprt, sk->sk_socket, err);
if (test_bit(XPRT_CONNECTION_REUSE, &xprt->state))
goto out;
xprt_wake_pending_tasks(xprt, err); xprt_wake_pending_tasks(xprt, err);
out: out:
read_unlock_bh(&sk->sk_callback_lock); read_unlock_bh(&sk->sk_callback_lock);
@ -2102,57 +2100,6 @@ out:
xprt_wake_pending_tasks(xprt, status); xprt_wake_pending_tasks(xprt, status);
} }
/*
* We need to preserve the port number so the reply cache on the server can
* find our cached RPC replies when we get around to reconnecting.
*/
static void xs_abort_connection(struct sock_xprt *transport)
{
int result;
struct sockaddr any;
dprintk("RPC: disconnecting xprt %p to reuse port\n", transport);
/*
* Disconnect the transport socket by doing a connect operation
* with AF_UNSPEC. This should return immediately...
*/
memset(&any, 0, sizeof(any));
any.sa_family = AF_UNSPEC;
result = kernel_connect(transport->sock, &any, sizeof(any), 0);
trace_rpc_socket_reset_connection(&transport->xprt,
transport->sock, result);
if (!result)
xs_sock_reset_connection_flags(&transport->xprt);
dprintk("RPC: AF_UNSPEC connect return code %d\n", result);
}
static void xs_tcp_reuse_connection(struct sock_xprt *transport)
{
unsigned int state = transport->inet->sk_state;
if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) {
/* we don't need to abort the connection if the socket
* hasn't undergone a shutdown
*/
if (transport->inet->sk_shutdown == 0)
return;
dprintk("RPC: %s: TCP_CLOSEd and sk_shutdown set to %d\n",
__func__, transport->inet->sk_shutdown);
}
if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) {
/* we don't need to abort the connection if the socket
* hasn't undergone a shutdown
*/
if (transport->inet->sk_shutdown == 0)
return;
dprintk("RPC: %s: ESTABLISHED/SYN_SENT "
"sk_shutdown set to %d\n",
__func__, transport->inet->sk_shutdown);
}
xs_abort_connection(transport);
}
static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock) static int xs_tcp_finish_connecting(struct rpc_xprt *xprt, struct socket *sock)
{ {
struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt);
@ -2245,18 +2192,6 @@ static void xs_tcp_setup_socket(struct work_struct *work)
status = PTR_ERR(sock); status = PTR_ERR(sock);
goto out; goto out;
} }
} else {
int abort_and_exit;
abort_and_exit = test_and_clear_bit(XPRT_CONNECTION_ABORT,
&xprt->state);
/* "close" the socket, preserving the local port */
set_bit(XPRT_CONNECTION_REUSE, &xprt->state);
xs_tcp_reuse_connection(transport);
clear_bit(XPRT_CONNECTION_REUSE, &xprt->state);
if (abort_and_exit)
goto out_eagain;
} }
dprintk("RPC: worker connecting xprt %p via %s to " dprintk("RPC: worker connecting xprt %p via %s to "
@ -2296,9 +2231,9 @@ static void xs_tcp_setup_socket(struct work_struct *work)
case -EADDRINUSE: case -EADDRINUSE:
case -ENOBUFS: case -ENOBUFS:
/* retry with existing socket, after a delay */ /* retry with existing socket, after a delay */
xs_tcp_force_close(xprt);
goto out; goto out;
} }
out_eagain:
status = -EAGAIN; status = -EAGAIN;
out: out:
xprt_unlock_connect(xprt, transport); xprt_unlock_connect(xprt, transport);