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,URIBL_BLOCKED,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 6B1BEC433DF for ; Mon, 29 Jun 2020 19:49:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4734A20760 for ; Mon, 29 Jun 2020 19:49:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593460187; bh=SrV5cXXsBccjf35hFWEA1E2p80pMETKwb96DN6XalTE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Md50VNg2TsCiQlIHdyLRwOAVRjj1rfUBIYX9VbElILmfNm0T4UZrcIwVrRNZAuAx7 gB0IdldNxZHuMuIP6Qs7I2fM/NojVEGe3ko0iPoTs71P1n3WWnCzSMmpBXOZXDR1Op Yt+1pApa+OIsbFXnRV5IE2sYbPC9S3Fdjy+POaMU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387829AbgF2Ttq (ORCPT ); Mon, 29 Jun 2020 15:49:46 -0400 Received: from mail.kernel.org ([198.145.29.99]:47654 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387580AbgF2Tkh (ORCPT ); Mon, 29 Jun 2020 15:40:37 -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 5592A251C4; Mon, 29 Jun 2020 15:28:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593444496; bh=SrV5cXXsBccjf35hFWEA1E2p80pMETKwb96DN6XalTE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Z/m2rDhdNrK9DYxQhKlB3HJSZ3l5FPM3IGRZcl8TGb2MMT9ZUJfjWYj6kS2HAjEIQ +Onqpqaswl9Yuu7MH3l2R2Yp0mrTO7CeLD7PHTbl6mZJ17vl+1VuELEi2G1+Vm8xXi DGuY/G+C49YMhvXO2rZX5nwTm5+IcKHkTpwXgBSo= 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 5.4 173/178] NFSv4 fix CLOSE not waiting for direct IO compeletion Date: Mon, 29 Jun 2020 11:25:18 -0400 Message-Id: <20200629152523.2494198-174-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200629152523.2494198-1-sashal@kernel.org> References: <20200629152523.2494198-1-sashal@kernel.org> MIME-Version: 1.0 X-KernelTest-Patch: http://kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.4.50-rc1.gz X-KernelTest-Tree: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git X-KernelTest-Branch: linux-5.4.y X-KernelTest-Patches: git://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git X-KernelTest-Version: 5.4.50-rc1 X-KernelTest-Deadline: 2020-07-01T15:25+00:00 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 6b0bf4ebd8124..70cf8c5760c73 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -367,8 +367,6 @@ static void nfs_direct_complete(struct nfs_direct_req *dreq) { struct inode *inode = dreq->inode; - inode_dio_end(inode); - if (dreq->iocb) { long res = (long) dreq->error; if (dreq->count != 0) { @@ -380,7 +378,10 @@ static void nfs_direct_complete(struct nfs_direct_req *dreq) complete(&dreq->completion); + igrab(inode); nfs_direct_req_release(dreq); + inode_dio_end(inode); + iput(inode); } static void nfs_direct_read_completion(struct nfs_pgio_header *hdr) @@ -510,8 +511,10 @@ 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; } @@ -923,8 +926,10 @@ 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 95dc90570786c..7b31367532054 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -83,6 +83,7 @@ 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