From patchwork Mon Jun 26 16:08:31 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Drobyshev X-Patchwork-Id: 13293113 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 68A83EB64DC for ; Mon, 26 Jun 2023 16:09:34 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qDolh-0004D3-GD; Mon, 26 Jun 2023 12:08:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qDole-0004Ad-DN; Mon, 26 Jun 2023 12:08:42 -0400 Received: from relay.virtuozzo.com ([130.117.225.111]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qDolc-0001gm-Rh; Mon, 26 Jun 2023 12:08:42 -0400 Received: from dev005.ch-qa.vzint.dev ([172.29.1.10]) by relay.virtuozzo.com with esmtp (Exim 4.96) (envelope-from ) id 1qDoka-00DiMx-12; Mon, 26 Jun 2023 18:08:27 +0200 To: qemu-block@nongnu.org, qemu-stable@nongnu.org Cc: qemu-devel@nongnu.org, kwolf@redhat.com, hreitz@redhat.com, vsementsov@yandex-team.ru, eblake@redhat.com, andrey.drobyshev@virtuozzo.com, den@virtuozzo.com Subject: [PATCH 0/3] block: align CoR requests to subclusters Date: Mon, 26 Jun 2023 19:08:31 +0300 Message-Id: <20230626160834.696680-1-andrey.drobyshev@virtuozzo.com> X-Mailer: git-send-email 2.39.3 MIME-Version: 1.0 Received-SPF: pass client-ip=130.117.225.111; envelope-from=andrey.drobyshev@virtuozzo.com; helo=relay.virtuozzo.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-to: Andrey Drobyshev X-Patchwork-Original-From: Andrey Drobyshev via From: Andrey Drobyshev Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org This series makes IO requests performed with copy-on-read to be aligned to subclusters rather than clusters. It also affects mirror job requests alignment. The initial reason for that change is the following crash discovered: qemu-img create -f qcow2 base.qcow2 64K qemu-img create -f qcow2 -o extended_l2=on,backing_file=base.qcow2,backing_fmt=qcow2 img.qcow2 64K qemu-io -c "write -P 0xaa 0 2K" img.qcow2 qemu-io -C -c "read -P 0x00 2K 62K" img.qcow2 qemu-io: ../block/io.c:1236: bdrv_co_do_copy_on_readv: Assertion `skip_bytes < pnum' failed. This change in alignment fixes the crash and adds test case covering it. Andrey Drobyshev (3): block: add subcluster_size field to BlockDriverInfo block/io: align requests to subcluster_size tests/qemu-iotests/197: add testcase for CoR with subclusters block.c | 6 +++++ block/io.c | 50 ++++++++++++++++++------------------ block/mirror.c | 8 +++--- block/qcow2.c | 1 + include/block/block-common.h | 4 +++ include/block/block-io.h | 2 +- tests/qemu-iotests/197 | 29 +++++++++++++++++++++ tests/qemu-iotests/197.out | 24 +++++++++++++++++ 8 files changed, 94 insertions(+), 30 deletions(-)