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SUNRPC: Fix the problem of EADDRNOTAVAIL syslog floods on reconnect

Browse source 
See http://bugzilla.kernel.org/show_bug.cgi?id=13034

If the port gets into a TIME_WAIT state, then we cannot reconnect without
binding to a new port.

Tested-by: Petr Vandrovec <petr@vandrovec.name>
Tested-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Trond Myklebust 2009-04-21 17:18:20 -04:00 committed by Linus Torvalds
parent 414772fa49
commit f75e6745aa
3 changed files with 24 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
include/linux/sunrpc/xprt.h
View file

@ -261,6 +261,7 @@ void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie);
#define XPRT_BINDING (5)
#define XPRT_CLOSING (6)
#define XPRT_CONNECTION_ABORT (7)
#define XPRT_CONNECTION_CLOSE (8)
static inline void xprt_set_connected(struct rpc_xprt *xprt)
{

6
net/sunrpc/xprt.c
View file

@ -672,10 +672,8 @@ xprt_init_autodisconnect(unsigned long data)
if (test_and_set_bit(XPRT_LOCKED, &xprt->state))
goto out_abort;
spin_unlock(&xprt->transport_lock);
if (xprt_connecting(xprt))
xprt_release_write(xprt, NULL);
else
queue_work(rpciod_workqueue, &xprt->task_cleanup);
set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
queue_work(rpciod_workqueue, &xprt->task_cleanup);
return;
out_abort:
spin_unlock(&xprt->transport_lock);

26
net/sunrpc/xprtsock.c
View file

@ -807,6 +807,9 @@ static void xs_reset_transport(struct sock_xprt *transport)
*
* This is used when all requests are complete; ie, no DRC state remains
* on the server we want to save.
*
* The caller _must_ be holding XPRT_LOCKED in order to avoid issues with
* xs_reset_transport() zeroing the socket from underneath a writer.
*/
static void xs_close(struct rpc_xprt *xprt)
{
@ -824,6 +827,14 @@ static void xs_close(struct rpc_xprt *xprt)
xprt_disconnect_done(xprt);
}
static void xs_tcp_close(struct rpc_xprt *xprt)
{
if (test_and_clear_bit(XPRT_CONNECTION_CLOSE, &xprt->state))
xs_close(xprt);
else
xs_tcp_shutdown(xprt);
}
/**
* xs_destroy - prepare to shutdown a transport
* @xprt: doomed transport
@ -1772,6 +1783,15 @@ static void xs_tcp_setup_socket(struct rpc_xprt *xprt,
xprt, -status, xprt_connected(xprt),
sock->sk->sk_state);
switch (status) {
default:
printk("%s: connect returned unhandled error %d\n",
__func__, status);
case -EADDRNOTAVAIL:
/* We're probably in TIME_WAIT. Get rid of existing socket,
* and retry
*/
set_bit(XPRT_CONNECTION_CLOSE, &xprt->state);
xprt_force_disconnect(xprt);
case -ECONNREFUSED:
case -ECONNRESET:
case -ENETUNREACH:
@ -1782,10 +1802,6 @@ static void xs_tcp_setup_socket(struct rpc_xprt *xprt,
xprt_clear_connecting(xprt);
return;
}
/* get rid of existing socket, and retry */
xs_tcp_shutdown(xprt);
printk("%s: connect returned unhandled error %d\n",
__func__, status);
out_eagain:
status = -EAGAIN;
out:
@ -1994,7 +2010,7 @@ static struct rpc_xprt_ops xs_tcp_ops = {
.buf_free = rpc_free,
.send_request = xs_tcp_send_request,
.set_retrans_timeout = xprt_set_retrans_timeout_def,
.close = xs_tcp_shutdown,
.close = xs_tcp_close,
.destroy = xs_destroy,
.print_stats = xs_tcp_print_stats,
};