Return-Path: Received: from mail-qk1-f193.google.com ([209.85.222.193]:37383 "EHLO mail-qk1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728229AbeIQSbe (ORCPT ); Mon, 17 Sep 2018 14:31:34 -0400 Received: by mail-qk1-f193.google.com with SMTP id f17-v6so8912083qkh.4 for ; Mon, 17 Sep 2018 06:04:19 -0700 (PDT) Received: from leira.trondhjem.org.localdomain ([66.187.232.65]) by smtp.gmail.com with ESMTPSA id q1-v6sm10499607qkl.31.2018.09.17.06.04.17 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 17 Sep 2018 06:04:17 -0700 (PDT) From: Trond Myklebust To: linux-nfs@vger.kernel.org Subject: [PATCH v3 18/44] SUNRPC: Distinguish between the slot allocation list and receive queue Date: Mon, 17 Sep 2018 09:03:09 -0400 Message-Id: <20180917130335.112832-19-trond.myklebust@hammerspace.com> In-Reply-To: <20180917130335.112832-18-trond.myklebust@hammerspace.com> References: <20180917130335.112832-1-trond.myklebust@hammerspace.com> <20180917130335.112832-2-trond.myklebust@hammerspace.com> <20180917130335.112832-3-trond.myklebust@hammerspace.com> <20180917130335.112832-4-trond.myklebust@hammerspace.com> <20180917130335.112832-5-trond.myklebust@hammerspace.com> <20180917130335.112832-6-trond.myklebust@hammerspace.com> <20180917130335.112832-7-trond.myklebust@hammerspace.com> <20180917130335.112832-8-trond.myklebust@hammerspace.com> <20180917130335.112832-9-trond.myklebust@hammerspace.com> <20180917130335.112832-10-trond.myklebust@hammerspace.com> <20180917130335.112832-11-trond.myklebust@hammerspace.com> <20180917130335.112832-12-trond.myklebust@hammerspace.com> <20180917130335.112832-13-trond.myklebust@hammerspace.com> <20180917130335.112832-14-trond.myklebust@hammerspace.com> <20180917130335.112832-15-trond.myklebust@hammerspace.com> <20180917130335.112832-16-trond.myklebust@hammerspace.com> <20180917130335.112832-17-trond.myklebust@hammerspace.com> <20180917130335.112832-18-trond.myklebust@hammerspace.com> MIME-Version: 1.0 Sender: linux-nfs-owner@vger.kernel.org List-ID: When storing a struct rpc_rqst on the slot allocation list, we currently use the same field 'rq_list' as we use to store the request on the receive queue. Since the structure is never on both lists at the same time, this is OK. However, for clarity, let's make that a union with different names for the different lists so that we can more easily distinguish between the two states. Signed-off-by: Trond Myklebust --- include/linux/sunrpc/xprt.h | 9 +++++++-- net/sunrpc/xprt.c | 12 ++++++------ 2 files changed, 13 insertions(+), 8 deletions(-) diff --git a/include/linux/sunrpc/xprt.h b/include/linux/sunrpc/xprt.h index 4fa2af087cff..9cec2d0811f2 100644 --- a/include/linux/sunrpc/xprt.h +++ b/include/linux/sunrpc/xprt.h @@ -82,7 +82,11 @@ struct rpc_rqst { struct page **rq_enc_pages; /* scratch pages for use by gss privacy code */ void (*rq_release_snd_buf)(struct rpc_rqst *); /* release rq_enc_pages */ - struct list_head rq_list; + + union { + struct list_head rq_list; /* Slot allocation list */ + struct list_head rq_recv; /* Receive queue */ + }; void *rq_buffer; /* Call XDR encode buffer */ size_t rq_callsize; @@ -249,7 +253,8 @@ struct rpc_xprt { struct list_head bc_pa_list; /* List of preallocated * backchannel rpc_rqst's */ #endif /* CONFIG_SUNRPC_BACKCHANNEL */ - struct list_head recv; + + struct list_head recv_queue; /* Receive queue */ struct { unsigned long bind_count, /* total number of binds */ diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index fe857ab18ee2..b242a1c78f8a 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -708,7 +708,7 @@ static void xprt_schedule_autodisconnect(struct rpc_xprt *xprt) __must_hold(&xprt->transport_lock) { - if (list_empty(&xprt->recv) && xprt_has_timer(xprt)) + if (list_empty(&xprt->recv_queue) && xprt_has_timer(xprt)) mod_timer(&xprt->timer, xprt->last_used + xprt->idle_timeout); } @@ -718,7 +718,7 @@ xprt_init_autodisconnect(struct timer_list *t) struct rpc_xprt *xprt = from_timer(xprt, t, timer); spin_lock(&xprt->transport_lock); - if (!list_empty(&xprt->recv)) + if (!list_empty(&xprt->recv_queue)) goto out_abort; /* Reset xprt->last_used to avoid connect/autodisconnect cycling */ xprt->last_used = jiffies; @@ -848,7 +848,7 @@ struct rpc_rqst *xprt_lookup_rqst(struct rpc_xprt *xprt, __be32 xid) { struct rpc_rqst *entry; - list_for_each_entry(entry, &xprt->recv, rq_list) + list_for_each_entry(entry, &xprt->recv_queue, rq_recv) if (entry->rq_xid == xid) { trace_xprt_lookup_rqst(xprt, xid, 0); entry->rq_rtt = ktime_sub(ktime_get(), entry->rq_xtime); @@ -937,7 +937,7 @@ xprt_request_enqueue_receive(struct rpc_task *task) sizeof(req->rq_private_buf)); /* Add request to the receive list */ - list_add_tail(&req->rq_list, &xprt->recv); + list_add_tail(&req->rq_recv, &xprt->recv_queue); set_bit(RPC_TASK_NEED_RECV, &task->tk_runstate); spin_unlock(&xprt->queue_lock); @@ -956,7 +956,7 @@ static void xprt_request_dequeue_receive_locked(struct rpc_task *task) { if (test_and_clear_bit(RPC_TASK_NEED_RECV, &task->tk_runstate)) - list_del(&task->tk_rqstp->rq_list); + list_del(&task->tk_rqstp->rq_recv); } /** @@ -1491,7 +1491,7 @@ static void xprt_init(struct rpc_xprt *xprt, struct net *net) spin_lock_init(&xprt->queue_lock); INIT_LIST_HEAD(&xprt->free); - INIT_LIST_HEAD(&xprt->recv); + INIT_LIST_HEAD(&xprt->recv_queue); #if defined(CONFIG_SUNRPC_BACKCHANNEL) spin_lock_init(&xprt->bc_pa_lock); INIT_LIST_HEAD(&xprt->bc_pa_list); -- 2.17.1