From patchwork Mon Dec 17 16:25:01 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vasily Averin X-Patchwork-Id: 10733789 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D42FC1399 for ; Mon, 17 Dec 2018 16:25:07 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id C098E2A1C4 for ; Mon, 17 Dec 2018 16:25:07 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B50082A1CB; Mon, 17 Dec 2018 16:25:07 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, 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 4F9682A1C4 for ; Mon, 17 Dec 2018 16:25:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388244AbeLQQZG (ORCPT ); Mon, 17 Dec 2018 11:25:06 -0500 Received: from relay.sw.ru ([185.231.240.75]:51830 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388148AbeLQQZG (ORCPT ); Mon, 17 Dec 2018 11:25:06 -0500 Received: from [172.16.24.21] by relay.sw.ru with esmtp (Exim 4.91) (envelope-from ) id 1gYvhW-00010I-DY; Mon, 17 Dec 2018 19:25:02 +0300 From: Vasily Averin Subject: [PATCH 2/4] nfs: remove sv_bc_enabled using in svc_is_backchannel() To: "J. Bruce Fields" , Jeff Layton , Trond Myklebust , Anna Schumaker Cc: Chuck Lever , "linux-nfs@vger.kernel.org" , Konstantin Khorenko , Evgenii Shatokhin Message-ID: <7b17745f-478b-affa-de7c-98d70a5431cb@virtuozzo.com> Date: Mon, 17 Dec 2018 19:25:01 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 Content-Language: en-US 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 serv->sv_bc_xprt cannot be used as pointer, serv is global structure, but sv_bc_xprt is assigned per-netnamespace The only user of this field is svc_is_backchannel() where it is used not as pointer but as mark of backchannel-compatible servers. Convert netns-unsafe xprt pointer to simple boolean mark, Hope it helps to prevent misuse of sv_bc_xpr in future. Signed-off-by: Vasily Averin Reviewed-by: Jeff Layton --- include/linux/sunrpc/bc_xprt.h | 10 ++++------ include/linux/sunrpc/svc.h | 2 +- net/sunrpc/svcsock.c | 2 +- net/sunrpc/xprtrdma/svc_rdma_transport.c | 2 +- 4 files changed, 7 insertions(+), 9 deletions(-) diff --git a/include/linux/sunrpc/bc_xprt.h b/include/linux/sunrpc/bc_xprt.h index 28721cf73ec3..4e8c773d02be 100644 --- a/include/linux/sunrpc/bc_xprt.h +++ b/include/linux/sunrpc/bc_xprt.h @@ -47,11 +47,9 @@ void xprt_free_bc_rqst(struct rpc_rqst *req); /* * Determine if a shared backchannel is in use */ -static inline int svc_is_backchannel(const struct svc_rqst *rqstp) +static inline bool svc_is_backchannel(const struct svc_rqst *rqstp) { - if (rqstp->rq_server->sv_bc_xprt) - return 1; - return 0; + return rqstp->rq_server->sv_bc_enabled; } #else /* CONFIG_SUNRPC_BACKCHANNEL */ static inline int xprt_setup_backchannel(struct rpc_xprt *xprt, @@ -60,9 +58,9 @@ static inline int xprt_setup_backchannel(struct rpc_xprt *xprt, return 0; } -static inline int svc_is_backchannel(const struct svc_rqst *rqstp) +static inline bool svc_is_backchannel(const struct svc_rqst *rqstp) { - return 0; + return false; } static inline void xprt_free_bc_request(struct rpc_rqst *req) diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h index 73e130a840ce..bf21609160c1 100644 --- a/include/linux/sunrpc/svc.h +++ b/include/linux/sunrpc/svc.h @@ -109,7 +109,7 @@ struct svc_serv { spinlock_t sv_cb_lock; /* protects the svc_cb_list */ wait_queue_head_t sv_cb_waitq; /* sleep here if there are no * entries in the svc_cb_list */ - struct svc_xprt *sv_bc_xprt; /* callback on fore channel */ + bool sv_bc_enabled; /* server uses backchannel */ #endif /* CONFIG_SUNRPC_BACKCHANNEL */ }; diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c index 986f3ed7d1a2..5a6b3ba555c7 100644 --- a/net/sunrpc/svcsock.c +++ b/net/sunrpc/svcsock.c @@ -1623,7 +1623,7 @@ static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv, svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv); set_bit(XPT_CONG_CTRL, &svsk->sk_xprt.xpt_flags); - serv->sv_bc_xprt = xprt; + serv->sv_bc_enabled = true; return xprt; } diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c index 2f7ec8912f49..88694048d5c0 100644 --- a/net/sunrpc/xprtrdma/svc_rdma_transport.c +++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c @@ -136,7 +136,7 @@ static struct svc_xprt *svc_rdma_bc_create(struct svc_serv *serv, svc_xprt_init(net, &svc_rdma_bc_class, xprt, serv); set_bit(XPT_CONG_CTRL, &xprt->xpt_flags); - serv->sv_bc_xprt = xprt; + serv->sv_bc_enabled = true; dprintk("svcrdma: %s(%p)\n", __func__, xprt); return xprt;