SUNRPC: Don't wake tasks during connection abort

When aborting a connection to preserve source ports, don't wake the task in
xs_error_report.  This allows tasks with RPC_TASK_SOFTCONN to succeed if the
connection needs to be re-established since it preserves the task's status
instead of setting it to the status of the aborting kernel_connect().

This may also avoid a potential conflict on the socket's lock.

Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Cc: stable@vger.kernel.org # 3.14+
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>

diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h
index fcbfe87..cf391ee 100644 (file)
--- a/include/linux/sunrpc/xprt.h
+++ b/include/linux/sunrpc/xprt.h
@@ -357,6 +357,7 @@ int                 xs_swapper(struct rpc_xprt *xprt, int enable);
 #define XPRT_CONNECTION_ABORT  (7)
 #define XPRT_CONNECTION_CLOSE  (8)
 #define XPRT_CONGESTED         (9)
+#define XPRT_CONNECTION_REUSE  (10)
 
 static inline void xprt_set_connected(struct rpc_xprt *xprt)
 {

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 7ed47b4..bffba4e 100644 (file)
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -845,6 +845,8 @@ static void xs_error_report(struct sock *sk)
        dprintk("RPC:       xs_error_report client %p, error=%d...\n",
                        xprt, -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);
  out:
        read_unlock_bh(&sk->sk_callback_lock);
@@ -2261,7 +2263,9 @@ static void xs_tcp_setup_socket(struct work_struct *work)
                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;