Messages in this thread Patch in this message | | | Date | Thu, 05 May 2011 17:20:53 -0700 | From | Greg KH <> | Subject | [068/143] SUNRPC: fix NFS client over TCP hangs due to packet loss (Bug 16494) |
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2.6.32-longterm review patch. If anyone has any objections, please let us know.
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From: Andy Chittenden <andyc.bluearc@gmail.com>
commit 669502ff31d7dba1849aec7ee2450a3c61f57d39 upstream.
When reusing a TCP connection, ensure that it's aborted if a previous shutdown attempt has been made on that connection so that the RPC over TCP recovery mechanism succeeds.
Signed-off-by: Andy Chittenden <andyc.bluearc@gmail.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- net/sunrpc/xprtsock.c | 28 ++++++++++++++++++++++------ 1 file changed, 22 insertions(+), 6 deletions(-)
--- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -1343,10 +1343,11 @@ static void xs_tcp_state_change(struct s if (!(xprt = xprt_from_sock(sk))) goto out; dprintk("RPC: xs_tcp_state_change client %p...\n", xprt); - dprintk("RPC: state %x conn %d dead %d zapped %d\n", + dprintk("RPC: state %x conn %d dead %d zapped %d sk_shutdown %d\n", sk->sk_state, xprt_connected(xprt), sock_flag(sk, SOCK_DEAD), - sock_flag(sk, SOCK_ZAPPED)); + sock_flag(sk, SOCK_ZAPPED), + sk->sk_shutdown); switch (sk->sk_state) { case TCP_ESTABLISHED: @@ -1817,10 +1818,25 @@ static void xs_tcp_reuse_connection(stru { unsigned int state = transport->inet->sk_state; - if (state == TCP_CLOSE && transport->sock->state == SS_UNCONNECTED) - return; - if ((1 << state) & (TCPF_ESTABLISHED|TCPF_SYN_SENT)) - return; + 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(xprt, transport); }
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