From dc48e0abee245e2f0361bd8d4e3b00f70450fab2 Mon Sep 17 00:00:00 2001 From: Olga Kornievskaia Date: Fri, 27 Aug 2021 14:37:18 -0400 Subject: SUNRPC enforce creation of no more than max_connect xprts If we are adding new transports via rpc_clnt_test_and_add_xprt() then check if we've reached the limit. Currently only pnfs path adds transports via that function but this is done in preparation when the client would add new transports when session trunking is detected. A warning is logged if the limit is reached. Signed-off-by: Olga Kornievskaia Signed-off-by: Anna Schumaker --- net/sunrpc/clnt.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'net/sunrpc') diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 451ac7d031db..f056ff931444 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -2787,6 +2787,15 @@ int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt, struct rpc_cb_add_xprt_calldata *data; struct rpc_task *task; + if (xps->xps_nunique_destaddr_xprts + 1 > clnt->cl_max_connect) { + rcu_read_lock(); + pr_warn("SUNRPC: reached max allowed number (%d) did not add " + "transport to server: %s\n", clnt->cl_max_connect, + rpc_peeraddr2str(clnt, RPC_DISPLAY_ADDR)); + rcu_read_unlock(); + return -EINVAL; + } + data = kmalloc(sizeof(*data), GFP_NOFS); if (!data) return -ENOMEM; -- cgit v1.2.3-59-g8ed1b