From patchwork Thu Mar 21 13:33:23 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fiona Ebner X-Patchwork-Id: 13598753 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 2A3FBC54E58 for ; Thu, 21 Mar 2024 13:35:12 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rnIYo-0003qE-Mq; Thu, 21 Mar 2024 09:34:22 -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 1rnIYJ-0003Tb-SO; Thu, 21 Mar 2024 09:33:52 -0400 Received: from proxmox-new.maurer-it.com ([94.136.29.106]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rnIY7-0007yK-0n; Thu, 21 Mar 2024 09:33:50 -0400 Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1]) by proxmox-new.maurer-it.com (Proxmox) with ESMTP id 785CD40E55; Thu, 21 Mar 2024 14:33:27 +0100 (CET) From: Fiona Ebner To: qemu-devel@nongnu.org Cc: qemu-block@nongnu.org, qemu-stable@nongnu.org, hreitz@redhat.com, kwolf@redhat.com, fam@euphon.net, stefanha@redhat.com, t.lamprecht@proxmox.com, w.bumiller@proxmox.com Subject: [PATCH v2 3/3] iotests: add test for stream job with an unaligned prefetch read Date: Thu, 21 Mar 2024 14:33:23 +0100 Message-Id: <20240321133323.831133-4-f.ebner@proxmox.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240321133323.831133-1-f.ebner@proxmox.com> References: <20240321133323.831133-1-f.ebner@proxmox.com> MIME-Version: 1.0 Received-SPF: pass client-ip=94.136.29.106; envelope-from=f.ebner@proxmox.com; helo=proxmox-new.maurer-it.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 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: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Previously, bdrv_pad_request() could not deal with a NULL qiov when a read needed to be aligned. During prefetch, a stream job will pass a NULL qiov. Add a test case to cover this scenario. By accident, also covers a previous race during shutdown, where block graph changes during iteration in bdrv_flush_all() could lead to unreferencing the wrong block driver state and an assertion failure later. Signed-off-by: Fiona Ebner --- New in v2. .../tests/stream-unaligned-prefetch | 86 +++++++++++++++++++ .../tests/stream-unaligned-prefetch.out | 5 ++ 2 files changed, 91 insertions(+) create mode 100755 tests/qemu-iotests/tests/stream-unaligned-prefetch create mode 100644 tests/qemu-iotests/tests/stream-unaligned-prefetch.out diff --git a/tests/qemu-iotests/tests/stream-unaligned-prefetch b/tests/qemu-iotests/tests/stream-unaligned-prefetch new file mode 100755 index 0000000000..546db1d369 --- /dev/null +++ b/tests/qemu-iotests/tests/stream-unaligned-prefetch @@ -0,0 +1,86 @@ +#!/usr/bin/env python3 +# group: rw quick +# +# Test what happens when a stream job does an unaligned prefetch read +# which requires padding while having a NULL qiov. +# +# Copyright (C) Proxmox Server Solutions GmbH +# +# This program is free software; you can redistribute it and/or modify +# it under the terms of the GNU General Public License as published by +# the Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, +# but WITHOUT ANY WARRANTY; without even the implied warranty of +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +# GNU General Public License for more details. +# +# You should have received a copy of the GNU General Public License +# along with this program. If not, see . +# + +import os +import iotests +from iotests import imgfmt, qemu_img_create, qemu_io, QMPTestCase + +image_size = 1 * 1024 * 1024 +cluster_size = 64 * 1024 +base = os.path.join(iotests.test_dir, 'base.img') +top = os.path.join(iotests.test_dir, 'top.img') + +class TestStreamUnalignedPrefetch(QMPTestCase): + def setUp(self) -> None: + """ + Create two images: + - base image {base} with {cluster_size // 2} bytes allocated + - top image {top} without any data allocated and coarser + cluster size + + Attach a compress filter for the top image, because that + requires that the request alignment is the top image's cluster + size. + """ + qemu_img_create('-f', imgfmt, + '-o', 'cluster_size={}'.format(cluster_size // 2), + base, str(image_size)) + qemu_io('-c', f'write 0 {cluster_size // 2}', base) + qemu_img_create('-f', imgfmt, + '-o', 'cluster_size={}'.format(cluster_size), + top, str(image_size)) + + self.vm = iotests.VM() + self.vm.add_blockdev(self.vm.qmp_to_opts({ + 'driver': imgfmt, + 'node-name': 'base', + 'file': { + 'driver': 'file', + 'filename': base + } + })) + self.vm.add_blockdev(self.vm.qmp_to_opts({ + 'driver': 'compress', + 'node-name': 'compress-top', + 'file': { + 'driver': imgfmt, + 'node-name': 'top', + 'file': { + 'driver': 'file', + 'filename': top + }, + 'backing': 'base' + } + })) + self.vm.launch() + + def tearDown(self) -> None: + self.vm.shutdown() + os.remove(top) + os.remove(base) + + def test_stream_unaligned_prefetch(self) -> None: + self.vm.cmd('block-stream', job_id='stream', device='compress-top') + + +if __name__ == '__main__': + iotests.main(supported_fmts=['qcow2'], supported_protocols=['file']) diff --git a/tests/qemu-iotests/tests/stream-unaligned-prefetch.out b/tests/qemu-iotests/tests/stream-unaligned-prefetch.out new file mode 100644 index 0000000000..ae1213e6f8 --- /dev/null +++ b/tests/qemu-iotests/tests/stream-unaligned-prefetch.out @@ -0,0 +1,5 @@ +. +---------------------------------------------------------------------- +Ran 1 tests + +OK