From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B7987C433E0 for ; Mon, 29 Jun 2020 21:15:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8FE8220702 for ; Mon, 29 Jun 2020 21:15:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593465344; bh=iglSSy/eC9l0eP21No46s42jVb9ef03e/eA03aL4duw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=KZ956bbC4tiujuNz0lDe1arS9EkC2S0M0iy5/hT7+IINqU1URVQ599HLADM0ZoxzG i5Hr+aEBdGJRdKacAS19H9eWbb/MiPY83eYSePU4cFmO9HQn6DTHc+0E+WBj4O2mht TTf25VXo7asGQY4Vh3J6KEfOZarliIjwtPI+98xo= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390625AbgF2VP2 (ORCPT ); Mon, 29 Jun 2020 17:15:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:42442 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729949AbgF2SzQ (ORCPT ); Mon, 29 Jun 2020 14:55:16 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id DCDFB2557A; Mon, 29 Jun 2020 15:55:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593446144; bh=iglSSy/eC9l0eP21No46s42jVb9ef03e/eA03aL4duw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zKHYGsuJRuOyRjMFHu2GTgtZk2U53wp9Mb5SixYgYCIaWbj4FztGNrylIdLD6yXI/ uYe9BJvn0DFigr66xcadpIVnxCXpl4Ugix9Bj/blCQECIZDPKYyv+Hcg7WWrG/wTK4 Lrg/jPiXB0VjHUtmVvQrsPKSvivw0rqfmYtJsqxo= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Olga Kornievskaia , Olga Kornievskaia , Neil Brown , Anna Schumaker , Greg Kroah-Hartman Subject: [PATCH 4.4 132/135] NFSv4 fix CLOSE not waiting for direct IO compeletion Date: Mon, 29 Jun 2020 11:53:06 -0400 Message-Id: <20200629155309.2495516-133-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200629155309.2495516-1-sashal@kernel.org> References: <20200629155309.2495516-1-sashal@kernel.org> MIME-Version: 1.0 X-KernelTest-Patch: http://kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.4.229-rc1.gz X-KernelTest-Tree: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git X-KernelTest-Branch: linux-4.4.y X-KernelTest-Patches: git://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git X-KernelTest-Version: 4.4.229-rc1 X-KernelTest-Deadline: 2020-07-01T15:53+00:00 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Olga Kornievskaia commit d03727b248d0dae6199569a8d7b629a681154633 upstream. Figuring out the root case for the REMOVE/CLOSE race and suggesting the solution was done by Neil Brown. Currently what happens is that direct IO calls hold a reference on the open context which is decremented as an asynchronous task in the nfs_direct_complete(). Before reference is decremented, control is returned to the application which is free to close the file. When close is being processed, it decrements its reference on the open_context but since directIO still holds one, it doesn't sent a close on the wire. It returns control to the application which is free to do other operations. For instance, it can delete a file. Direct IO is finally releasing its reference and triggering an asynchronous close. Which races with the REMOVE. On the server, REMOVE can be processed before the CLOSE, failing the REMOVE with EACCES as the file is still opened. Signed-off-by: Olga Kornievskaia Suggested-by: Neil Brown CC: stable@vger.kernel.org Signed-off-by: Anna Schumaker Signed-off-by: Greg Kroah-Hartman --- fs/nfs/direct.c | 13 +++++++++---- fs/nfs/file.c | 1 + 2 files changed, 10 insertions(+), 4 deletions(-) diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 7789f0b9b999e..4d76e9a97538d 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -385,8 +385,6 @@ static void nfs_direct_complete(struct nfs_direct_req *dreq, bool write) if (write) nfs_zap_mapping(inode, inode->i_mapping); - inode_dio_end(inode); - if (dreq->iocb) { long res = (long) dreq->error; if (!res) @@ -396,7 +394,10 @@ static void nfs_direct_complete(struct nfs_direct_req *dreq, bool write) complete_all(&dreq->completion); + igrab(inode); nfs_direct_req_release(dreq); + inode_dio_end(inode); + iput(inode); } static void nfs_direct_readpage_release(struct nfs_page *req) @@ -537,8 +538,10 @@ static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq, * generic layer handle the completion. */ if (requested_bytes == 0) { - inode_dio_end(inode); + igrab(inode); nfs_direct_req_release(dreq); + inode_dio_end(inode); + iput(inode); return result < 0 ? result : -EIO; } @@ -939,8 +942,10 @@ static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq, * generic layer handle the completion. */ if (requested_bytes == 0) { - inode_dio_end(inode); + igrab(inode); nfs_direct_req_release(dreq); + inode_dio_end(inode); + iput(inode); return result < 0 ? result : -EIO; } diff --git a/fs/nfs/file.c b/fs/nfs/file.c index dc875cd0e11d5..eaa6697d256ea 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -82,6 +82,7 @@ nfs_file_release(struct inode *inode, struct file *filp) dprintk("NFS: release(%pD2)\n", filp); nfs_inc_stats(inode, NFSIOS_VFSRELEASE); + inode_dio_wait(inode); nfs_file_clear_open_context(filp); return 0; } -- 2.25.1