| Date | Sun, 05 Feb 2012 23:10:03 +0100 | From | Willy Tarreau <> | Subject | [PATCH 14/91] SUNRPC: fix NFS client over TCP hangs due to packet loss (Bug 16494) |
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2.6.27-longterm review patch. If anyone has any objections, please let us know.
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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 files changed, 22 insertions(+), 6 deletions(-)
Index: longterm-2.6.27/net/sunrpc/xprtsock.c =================================================================== --- longterm-2.6.27.orig/net/sunrpc/xprtsock.c 2012-02-05 22:34:34.580914949 +0100 +++ longterm-2.6.27/net/sunrpc/xprtsock.c 2012-02-05 22:34:36.898916728 +0100 @@ -1126,10 +1126,11 @@ 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: @@ -1594,10 +1595,25 @@ { 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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