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=-13.1 required=3.0 tests=BAYES_00,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 510EBC433DF for ; Thu, 20 Aug 2020 00:13:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2B6E82075E for ; Thu, 20 Aug 2020 00:13:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597882409; bh=MBkMboyOu2HC7rdoGgP22MXfHtANShRjgzrfZ9vVLzg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=y9adh5K3UZiS7nYmU5t8xv2O+St8zVQhvydC4gGyxOwfa72hMIR10mRHB7HalR65I 30eL2oOqvakBAxE7jtazVrlXXmImEYqUA+n3jyjRlm4JP1XhR777avstlEPs6kaYrD qOi04UGATdsBKiYyY8kI6zRjO5zhhPsdL84hR7AE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728295AbgHTANZ (ORCPT ); Wed, 19 Aug 2020 20:13:25 -0400 Received: from mail.kernel.org ([198.145.29.99]:57648 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726885AbgHTABe (ORCPT ); Wed, 19 Aug 2020 20:01:34 -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 4C95221741; Thu, 20 Aug 2020 00:01:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1597881694; bh=MBkMboyOu2HC7rdoGgP22MXfHtANShRjgzrfZ9vVLzg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dR55g5B6YKKtXq737J/lJXnJg/a+P2Z5ZLFG3oSqGOQUmKakA2lRD4XEwJPaKG+47 9s63DusfCxAZ98Gsol127tuXy2wukDZHSE8dMQmQ8cC+TIauFT5oFU77d7Qh1NWDCR UZb7lvREpM61HuQDfnhdw4MubPaNJz2qzH7ON/3Q= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: "Darrick J. Wong" , Allison Collins , Chandan Babu R , Christoph Hellwig , Sasha Levin , linux-xfs@vger.kernel.org Subject: [PATCH AUTOSEL 5.8 13/27] xfs: fix inode quota reservation checks Date: Wed, 19 Aug 2020 20:01:02 -0400 Message-Id: <20200820000116.214821-13-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200820000116.214821-1-sashal@kernel.org> References: <20200820000116.214821-1-sashal@kernel.org> MIME-Version: 1.0 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: "Darrick J. Wong" [ Upstream commit f959b5d037e71a4d69b5bf71faffa065d9269b4a ] xfs_trans_dqresv is the function that we use to make reservations against resource quotas. Each resource contains two counters: the q_core counter, which tracks resources allocated on disk; and the dquot reservation counter, which tracks how much of that resource has either been allocated or reserved by threads that are working on metadata updates. For disk blocks, we compare the proposed reservation counter against the hard and soft limits to decide if we're going to fail the operation. However, for inodes we inexplicably compare against the q_core counter, not the incore reservation count. Since the q_core counter is always lower than the reservation count and we unlock the dquot between reservation and transaction commit, this means that multiple threads can reserve the last inode count before we hit the hard limit, and when they commit, we'll be well over the hard limit. Fix this by checking against the incore inode reservation counter, since we would appear to maintain that correctly (and that's what we report in GETQUOTA). Signed-off-by: Darrick J. Wong Reviewed-by: Allison Collins Reviewed-by: Chandan Babu R Reviewed-by: Christoph Hellwig Signed-off-by: Sasha Levin --- fs/xfs/xfs_trans_dquot.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/xfs/xfs_trans_dquot.c b/fs/xfs/xfs_trans_dquot.c index c0f73b82c0551..ed0ce8b301b40 100644 --- a/fs/xfs/xfs_trans_dquot.c +++ b/fs/xfs/xfs_trans_dquot.c @@ -647,7 +647,7 @@ xfs_trans_dqresv( } } if (ninos > 0) { - total_count = be64_to_cpu(dqp->q_core.d_icount) + ninos; + total_count = dqp->q_res_icount + ninos; timer = be32_to_cpu(dqp->q_core.d_itimer); warns = be16_to_cpu(dqp->q_core.d_iwarns); warnlimit = defq->iwarnlimit; -- 2.25.1