From: NeilBrown neilb@suse.com
commit fd01b2597941d9c17980222999b0721648b383b8 upstream.
If you - mount and NFSv3 filesystem - do some file locking which requires the server to make a GRANT call back - unmount - mount again and do the same locking
then the second attempt at locking suffers a 30 second delay. Unmounting and remounting causes lockd to stop and restart, which causes it to bind to a new port. The server still thinks the old port is valid and gets ECONNREFUSED when trying to contact it. ECONNREFUSED should be seen as a hard error that is not worth retrying. Rebinding is the only reasonable response.
This patch forces a rebind if that makes sense.
Signed-off-by: NeilBrown neilb@suse.com Signed-off-by: Trond Myklebust trond.myklebust@primarydata.com Cc: Calum Mackay calum.mackay@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- net/sunrpc/clnt.c | 8 ++++++++ 1 file changed, 8 insertions(+)
--- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -1936,6 +1936,14 @@ call_connect_status(struct rpc_task *tas task->tk_status = 0; switch (status) { case -ECONNREFUSED: + /* A positive refusal suggests a rebind is needed. */ + if (RPC_IS_SOFTCONN(task)) + break; + if (clnt->cl_autobind) { + rpc_force_rebind(clnt); + task->tk_action = call_bind; + return; + } case -ECONNRESET: case -ECONNABORTED: case -ENETUNREACH: