From patchwork Mon Apr 22 16:34:24 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeff Layton X-Patchwork-Id: 10911233 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 46CC41515 for ; Mon, 22 Apr 2019 16:34:30 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 3AA4620072 for ; Mon, 22 Apr 2019 16:34:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 2E8BE2851E; Mon, 22 Apr 2019 16:34:30 +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=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,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 C570420072 for ; Mon, 22 Apr 2019 16:34:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727463AbfDVQe3 (ORCPT ); Mon, 22 Apr 2019 12:34:29 -0400 Received: from mail.kernel.org ([198.145.29.99]:48720 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727347AbfDVQe3 (ORCPT ); Mon, 22 Apr 2019 12:34:29 -0400 Received: from tleilax.poochiereds.net (cpe-71-70-156-158.nc.res.rr.com [71.70.156.158]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id AA3F221738; Mon, 22 Apr 2019 16:34:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1555950868; bh=0PkiT99TqIXGtWCzH1VP7uqeerenrH5VZ7io2KGU7AY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IWXM6/aMV76bj9HPYCC2tINs5KDbhZBzZeFZfMlr8dTCStcCQoso4W/OAuS8Vc4mc Ry/3+XfBK4ZEPTbh55zDbLQmuYLlv6cuLd8YNJo45mahMLRkHySCApLgX994V086NC +0jRuqWhJ863VDAgrIP7wlkWx9jD17bhkxAsDyeU= From: Jeff Layton To: bfields@fieldses.org Cc: slawek1211@gmail.com, neilb@suse.com, linux-nfs@vger.kernel.org Subject: [PATCH v2 2/2] nfsd: wake blocked file lock waiters before sending callback Date: Mon, 22 Apr 2019 12:34:24 -0400 Message-Id: <20190422163424.19402-3-jlayton@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190422163424.19402-1-jlayton@kernel.org> References: <20190422163424.19402-1-jlayton@kernel.org> 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 When a blocked NFS lock is "awoken" we send a callback to the server and then wake any hosts waiting on it. If a client attempts to get a lock and then drops off the net, we could end up waiting for a long time until we end up waking locks blocked on that request. Add a new "prepare" phase for CB_NOTIFY_LOCK callbacks, and have it call locks_delete_block to wake any lock requests waiting on the one for which we're sending the callback before it is sent. URL: https://bugzilla.kernel.org/show_bug.cgi?id=203363 Fixes: 16306a61d3b7 ("fs/locks: always delete_block after waiting.") Reported-by: Slawomir Pryczek Cc: Neil Brown Cc: stable@vger.kernel.org Signed-off-by: Jeff Layton --- fs/nfsd/nfs4state.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c index e87e15df2044..f056b1d3fecd 100644 --- a/fs/nfsd/nfs4state.c +++ b/fs/nfsd/nfs4state.c @@ -298,6 +298,14 @@ remove_blocked_locks(struct nfs4_lockowner *lo) } } +static void +nfsd4_cb_notify_lock_prepare(struct nfsd4_callback *cb) +{ + struct nfsd4_blocked_lock *nbl = container_of(cb, + struct nfsd4_blocked_lock, nbl_cb); + locks_delete_block(&nbl->nbl_lock); +} + static int nfsd4_cb_notify_lock_done(struct nfsd4_callback *cb, struct rpc_task *task) { @@ -325,6 +333,7 @@ nfsd4_cb_notify_lock_release(struct nfsd4_callback *cb) } static const struct nfsd4_callback_ops nfsd4_cb_notify_lock_ops = { + .prepare = nfsd4_cb_notify_lock_prepare, .done = nfsd4_cb_notify_lock_done, .release = nfsd4_cb_notify_lock_release, };