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=-13.7 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 6A7FAC433DF for ; Mon, 24 Aug 2020 09:56:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 30B612071E for ; Mon, 24 Aug 2020 09:56:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598263004; bh=aGAVE7dUlLLoJZfcZXaEkseQizeF/7cuRvfQAW6y5Xw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=q9VgtpckDRS9s6RJwK0nINNxlyJrzKrTNGhRM7TwdOnZnmW2cjt6u4rYJOwBPahTP QKEJg6DF6FU9ADU74yu70OdkcX66id9VUdEf/BDPhuN+sDCVv4ibkDQI+ll/uVjmBs 2mr9fjZNrS4PmV4Q+2ojFiTqemOXcl+W6xUYUwSs= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728563AbgHXJ4n (ORCPT ); Mon, 24 Aug 2020 05:56:43 -0400 Received: from mail.kernel.org ([198.145.29.99]:46382 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728089AbgHXIfc (ORCPT ); Mon, 24 Aug 2020 04:35:32 -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 8BD0A206F0; Mon, 24 Aug 2020 08:35:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598258132; bh=aGAVE7dUlLLoJZfcZXaEkseQizeF/7cuRvfQAW6y5Xw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TrfDvVozbPDU2bEuF8/z7MlCaIX/GUoYdDJwByvQbjyKcVmlGU3R5gnYOJ5qYP9Rk tgMXh3QNhbrIAWqjsPuqGAph22iIYokOdMq98+qT2lTtnqTajNZbEPSVnD6F9nsbIS 85f8meGdiYxxgFTFklGPTszIKA255twnb/HR4c54= 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 5.8 057/148] xfs: fix inode quota reservation checks Date: Mon, 24 Aug 2020 10:29:15 +0200 Message-Id: <20200824082416.799697353@linuxfoundation.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200824082413.900489417@linuxfoundation.org> References: <20200824082413.900489417@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 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