From nobody Mon Feb 9 11:07:43 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1577015185; cv=none; d=zohomail.com; s=zohoarc; b=fC30ItqxGggLPMf76RfSL0bgQLHHiHWbVxbmnkgxp+w18b2Kf2EWXVtqsDOWC+RDJurU3AJgp0ZIJ96IUgNT/Q8rnhSGIISyggSGGBohmYpVx4YUq3Y9Os0RUxxLo4A5rgCPG85QNwUEKpkNJE9Ayc8eKKhwNLb8SlznqDdU1GI= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1577015185; h=Content-Transfer-Encoding:Cc:Date:From:In-Reply-To:List-Subscribe:List-Post:List-Id:List-Archive:List-Help:List-Unsubscribe:MIME-Version:Message-ID:References:Sender:Subject:To; bh=FfRwlFoUXwcSP1PUYtt1ApuHt/UcQFWHMXoKMvFasHA=; b=K/r4m8miwpz/X8X/sDHlsB9FBRO2ZuSzuBx8Smmlk3vFd5O0UUOtZxzvsIo7KWsKHVThgIYR8o+eMisPR/zpfnlZBa1j9Axj531+bL6/5o0+66ty2jdM8gIEQJpk5QnxHB2QP4o5m3CDbW1lGkOVFXNxk+AOb1QBV8UV6YtcwHI= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1577015185592578.8296578784111; Sun, 22 Dec 2019 03:46:25 -0800 (PST) Received: from localhost ([::1]:46766 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iizgm-0004BU-5S for importer@patchew.org; Sun, 22 Dec 2019 06:46:24 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:44203) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iizZD-0003UD-Si for qemu-devel@nongnu.org; Sun, 22 Dec 2019 06:38:36 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iizZC-000759-6c for qemu-devel@nongnu.org; Sun, 22 Dec 2019 06:38:35 -0500 Received: from fanzine.igalia.com ([178.60.130.6]:35042) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1iizZB-0004nS-JD; Sun, 22 Dec 2019 06:38:33 -0500 Received: from [80.30.182.172] (helo=perseus.local) by fanzine.igalia.com with esmtpsa (Cipher TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim) id 1iizYV-0005dM-01; Sun, 22 Dec 2019 12:37:52 +0100 Received: from berto by perseus.local with local (Exim 4.92) (envelope-from ) id 1iizXu-0001W7-RE; Sun, 22 Dec 2019 12:37:14 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=igalia.com; s=20170329; h=Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From; bh=FfRwlFoUXwcSP1PUYtt1ApuHt/UcQFWHMXoKMvFasHA=; b=Vd9T794WPeEoNkJP48CItIAD0AP/Shc/0+3bItdcHMbbG/LgbN+D4XYmOf1PFbxWnoyRpvu1mdacu992dQHJf2+Iq7u9bqK+EQnaKC23ANyd7HNgOxvP3D3mtW6OuJDTfPpaMf7mwG2gT3oMosIK3sy/mtQuojIV1dTFMp/0j3Kr5w99oc2kpg2IHidGHwGZcPtReQEvEuU74Uhe8tQvI5hWAZJUfy2hUxpl44UyclFOR61IhHqHPN7w1fbfOMX8R9RgdaHffBdvZcN8cxPHCdvWu56DdqVov0cJW+fiVJn/MuHeM20thlYYP3jmG9Vl3xGcs+2t6+pL8VfLl/1iXA==; From: Alberto Garcia To: qemu-devel@nongnu.org Subject: [RFC PATCH v3 20/27] qcow2: Fix offset calculation in handle_dependencies() Date: Sun, 22 Dec 2019 12:37:01 +0100 Message-Id: <655e0ce198903682430272f6cfecb08afee6667c.1577014346.git.berto@igalia.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x (no timestamps) [generic] [fuzzy] X-Received-From: 178.60.130.6 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Anton Nefedov , Alberto Garcia , qemu-block@nongnu.org, Max Reitz , Vladimir Sementsov-Ogievskiy , "Denis V . Lunev" Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" l2meta_cow_start() and l2meta_cow_end() are not necessarily cluster-aligned if the image has subclusters, so update the calculation of old_start and old_end to guarantee that no two requests try to write on the same cluster. Signed-off-by: Alberto Garcia Reviewed-by: Max Reitz --- block/qcow2-cluster.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index ede75138d2..0a40944667 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -1279,8 +1279,8 @@ static int handle_dependencies(BlockDriverState *bs, = uint64_t guest_offset, =20 uint64_t start =3D guest_offset; uint64_t end =3D start + bytes; - uint64_t old_start =3D l2meta_cow_start(old_alloc); - uint64_t old_end =3D l2meta_cow_end(old_alloc); + uint64_t old_start =3D start_of_cluster(s, l2meta_cow_start(old_al= loc)); + uint64_t old_end =3D ROUND_UP(l2meta_cow_end(old_alloc), s->cluste= r_size); =20 if (end <=3D old_start || start >=3D old_end) { /* No intersection */ --=20 2.20.1