linux-kernel - Re: [PATCH 1/3] SUNRPC: Ensure the server closes sockets in a timely fashion

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Message-Id: <1228090719.7112.13.camel@heimdal.trondhjem.org>
Date:	Sun, 30 Nov 2008 19:18:39 -0500
From:	Trond Myklebust <Trond.Myklebust@...app.com>
To:	Ian Campbell <ijc@...lion.org.uk>
Cc:	linux-nfs@...r.kernel.org, Max Kellermann <mk@...all.com>,
	linux-kernel@...r.kernel.org, gcosta@...hat.com,
	Grant Coady <grant_lkml@...o.com.au>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	Tom Tucker <tom@...ngridcomputing.com>
Subject: Re: [PATCH 1/3] SUNRPC: Ensure the server closes sockets in a
 timely fashion

We want to ensure that connected sockets close down the connection when we
set XPT_CLOSE, so that we don't keep it hanging while cleaning up all the
stuff that is keeping a reference to the socket.

Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
---

 net/sunrpc/svcsock.c |   21 ++++++++++++++++++++-
 1 files changed, 20 insertions(+), 1 deletions(-)


diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 95293f5..a1b048d 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -59,6 +59,7 @@ static void		svc_udp_data_ready(struct sock *, int);
 static int		svc_udp_recvfrom(struct svc_rqst *);
 static int		svc_udp_sendto(struct svc_rqst *);
 static void		svc_sock_detach(struct svc_xprt *);
+static void		svc_tcp_sock_detach(struct svc_xprt *);
 static void		svc_sock_free(struct svc_xprt *);
 
 static struct svc_xprt *svc_create_socket(struct svc_serv *, int,
@@ -1017,7 +1018,7 @@ static struct svc_xprt_ops svc_tcp_ops = {
 	.xpo_recvfrom = svc_tcp_recvfrom,
 	.xpo_sendto = svc_tcp_sendto,
 	.xpo_release_rqst = svc_release_skb,
-	.xpo_detach = svc_sock_detach,
+	.xpo_detach = svc_tcp_sock_detach,
 	.xpo_free = svc_sock_free,
 	.xpo_prep_reply_hdr = svc_tcp_prep_reply_hdr,
 	.xpo_has_wspace = svc_tcp_has_wspace,
@@ -1282,6 +1283,24 @@ static void svc_sock_detach(struct svc_xprt *xprt)
 	sk->sk_state_change = svsk->sk_ostate;
 	sk->sk_data_ready = svsk->sk_odata;
 	sk->sk_write_space = svsk->sk_owspace;
+
+	if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+		wake_up_interruptible(sk->sk_sleep);
+}
+
+/*
+ * Disconnect the socket, and reset the callbacks
+ */
+static void svc_tcp_sock_detach(struct svc_xprt *xprt)
+{
+	struct svc_sock *svsk = container_of(xprt, struct svc_sock, sk_xprt);
+
+	dprintk("svc: svc_tcp_sock_detach(%p)\n", svsk);
+
+	svc_sock_detach(xprt);
+
+	if (!test_bit(XPT_LISTENER, &xprt->xpt_flags))
+		kernel_sock_shutdown(svsk->sk_sock, SHUT_RDWR);
 }
 
 /*

-- 
Trond Myklebust
Linux NFS client maintainer

NetApp
Trond.Myklebust@...app.com
www.netapp.com
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