From patchwork Thu Sep 1 15:44:50 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andy Adamson X-Patchwork-Id: 9309361 X-Patchwork-Delegate: Trond.Myklebust@netapp.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 3304E60756 for ; Thu, 1 Sep 2016 15:46:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D8F3229480 for ; Thu, 1 Sep 2016 15:46:47 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CDC3329487; Thu, 1 Sep 2016 15:46:47 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 68D1B29480 for ; Thu, 1 Sep 2016 15:46:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933301AbcIAPqq (ORCPT ); Thu, 1 Sep 2016 11:46:46 -0400 Received: from mx141.netapp.com ([216.240.21.12]:3489 "EHLO mx141.netapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933132AbcIAPqp (ORCPT ); Thu, 1 Sep 2016 11:46:45 -0400 X-IronPort-AV: E=Sophos;i="5.30,268,1470726000"; d="scan'208";a="143978219" Received: from vmwexchts02-prd.hq.netapp.com ([10.122.105.23]) by mx141-out.netapp.com with ESMTP; 01 Sep 2016 08:46:44 -0700 Received: from smtp2.corp.netapp.com (10.57.159.114) by VMWEXCHTS02-PRD.hq.netapp.com (10.122.105.23) with Microsoft SMTP Server id 15.0.1210.3; Thu, 1 Sep 2016 08:46:41 -0700 Received: from rhel7-2-ga-2.androsad.fake (andros-new.vpn.netapp.com [10.55.76.232]) by smtp2.corp.netapp.com (8.13.1/8.13.1/NTAP-1.6) with ESMTP id u81FkbhQ021773; Thu, 1 Sep 2016 08:46:44 -0700 (PDT) From: To: CC: , , Andy Adamson Subject: [PATCH Version 9 RESEND 09/12] SUNRPC: rpc_clnt_add_xprt setup function for NFS layer Date: Thu, 1 Sep 2016 11:44:50 -0400 Message-ID: <1472744693-124241-10-git-send-email-andros@netapp.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1472744693-124241-1-git-send-email-andros@netapp.com> References: <1472744693-124241-1-git-send-email-andros@netapp.com> MIME-Version: 1.0 Sender: linux-nfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Andy Adamson Use a setup function to call into the NFS layer to test an rpc_xprt for session trunking so as to not leak the rpc_xprt_switch into the nfs layer. Search for the address in the rpc_xprt_switch first so as not to put an unnecessary EXCHANGE_ID on the wire. Signed-off-by: Andy Adamson --- include/linux/sunrpc/clnt.h | 12 +++++++++ net/sunrpc/clnt.c | 64 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 76 insertions(+) diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h index b932160..2087ab5 100644 --- a/include/linux/sunrpc/clnt.h +++ b/include/linux/sunrpc/clnt.h @@ -125,6 +125,13 @@ struct rpc_create_args { struct svc_xprt *bc_xprt; /* NFSv4.1 backchannel */ }; +struct rpc_add_xprt_test { + int (*add_xprt_test)(struct rpc_clnt *, + struct rpc_xprt *, + void *calldata); + void *data; +}; + /* Values for "flags" field */ #define RPC_CLNT_CREATE_HARDRTRY (1UL << 0) #define RPC_CLNT_CREATE_AUTOBIND (1UL << 2) @@ -196,6 +203,11 @@ int rpc_clnt_add_xprt(struct rpc_clnt *, struct xprt_create *, void *), void *data); +int rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *, + struct rpc_xprt_switch *, + struct rpc_xprt *, + void *); + const char *rpc_proc_name(const struct rpc_task *task); void rpc_clnt_xprt_switch_put(struct rpc_clnt *); diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 889ef94..c552eb2 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -2615,6 +2615,70 @@ int rpc_clnt_test_and_add_xprt(struct rpc_clnt *clnt, EXPORT_SYMBOL_GPL(rpc_clnt_test_and_add_xprt); /** + * rpc_clnt_setup_test_and_add_xprt() + * + * This is an rpc_clnt_add_xprt setup() function which returns 1 so: + * 1) caller of the test function must dereference the rpc_xprt_switch + * and the rpc_xprt. + * 2) test function must call rpc_xprt_switch_add_xprt, usually in + * the rpc_call_done routine. + * + * Upon success (return of 1), the test function adds the new + * transport to the rpc_clnt xprt switch + * + * @clnt: struct rpc_clnt to get the new transport + * @xps: the rpc_xprt_switch to hold the new transport + * @xprt: the rpc_xprt to test + * @data: a struct rpc_add_xprt_test pointer that holds the test function + * and test function call data + */ +int rpc_clnt_setup_test_and_add_xprt(struct rpc_clnt *clnt, + struct rpc_xprt_switch *xps, + struct rpc_xprt *xprt, + void *data) +{ + struct rpc_cred *cred; + struct rpc_task *task; + struct rpc_add_xprt_test *xtest = (struct rpc_add_xprt_test *)data; + int status = -EADDRINUSE; + + xprt = xprt_get(xprt); + xprt_switch_get(xps); + + if (rpc_xprt_switch_has_addr(xps, (struct sockaddr *)&xprt->addr)) + goto out_err; + + /* Test the connection */ + cred = authnull_ops.lookup_cred(NULL, NULL, 0); + task = rpc_call_null_helper(clnt, xprt, cred, + RPC_TASK_SOFT | RPC_TASK_SOFTCONN, + NULL, NULL); + put_rpccred(cred); + if (IS_ERR(task)) { + status = PTR_ERR(task); + goto out_err; + } + status = task->tk_status; + rpc_put_task(task); + + if (status < 0) + goto out_err; + + /* rpc_xprt_switch and rpc_xprt are deferrenced by add_xprt_test() */ + xtest->add_xprt_test(clnt, xprt, xtest->data); + + /* so that rpc_clnt_add_xprt does not call rpc_xprt_switch_add_xprt */ + return 1; +out_err: + xprt_put(xprt); + xprt_switch_put(xps); + pr_info("RPC: rpc_clnt_test_xprt failed: %d addr %s not added\n", + status, xprt->address_strings[RPC_DISPLAY_ADDR]); + return status; +} +EXPORT_SYMBOL_GPL(rpc_clnt_setup_test_and_add_xprt); + +/** * rpc_clnt_add_xprt - Add a new transport to a rpc_clnt * @clnt: pointer to struct rpc_clnt * @xprtargs: pointer to struct xprt_create