From patchwork Mon Aug 24 08:31:16 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 265056 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=-13.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, 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 D409BC433DF for ; Mon, 24 Aug 2020 09:32:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B1D2420738 for ; Mon, 24 Aug 2020 09:32:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598261538; bh=iJe/3JHxc52K59A8RyXOFoprL91A7wLriuBsahOuwoo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ajJUznDC1Z+1vbFG6jIubFwoJkyKvJTDMPVSL69k8cpGdvsNxMIw5b3nI5pRUKbZ1 Q643MR4KPK3aT4xdDLoLGabfKG4M91sXetOIUX87DBX4zkKiZjCBuJx3kbtsQZkX+r kuLjKDR//v2sa0+At7mk4H3zcb4gTx40eNeIHAKQ= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729295AbgHXIuO (ORCPT ); Mon, 24 Aug 2020 04:50:14 -0400 Received: from mail.kernel.org ([198.145.29.99]:53392 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729824AbgHXIuJ (ORCPT ); Mon, 24 Aug 2020 04:50:09 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (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 D15DF207D3; Mon, 24 Aug 2020 08:50:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598259009; bh=iJe/3JHxc52K59A8RyXOFoprL91A7wLriuBsahOuwoo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pWen/vtQEqlwx/tGCOK+gZX9okcOrhOdZEukARlBotBIkqyf3FXmNfXdLG51Xd2PU Ps6shK+dWYpSdtP6HN3wsYTzdkYfFZkIXQWXoqwnycIdqyCycccP5gNU72MnYf2/Ys jzAKjA3k6PxsBcUetB99Etwelw7r+vnPoaOKO0WQ= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Darrick J. Wong" , Allison Collins , Chandan Babu R , Christoph Hellwig , Sasha Levin Subject: [PATCH 4.4 20/33] xfs: fix inode quota reservation checks Date: Mon, 24 Aug 2020 10:31:16 +0200 Message-Id: <20200824082347.559533589@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200824082346.498653578@linuxfoundation.org> References: <20200824082346.498653578@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@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 ce78534a047ee..bb8de2dddabe2 100644 --- a/fs/xfs/xfs_trans_dquot.c +++ b/fs/xfs/xfs_trans_dquot.c @@ -662,7 +662,7 @@ 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 = dqp->q_mount->m_quotainfo->qi_iwarnlimit;