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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham 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 3763AC4CECD for ; Tue, 17 Sep 2019 16:15:54 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 0FFDA20665 for ; Tue, 17 Sep 2019 16:15:54 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0FFDA20665 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=virtuozzo.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:48094 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iAG8u-0003Vp-C3 for qemu-devel@archiver.kernel.org; Tue, 17 Sep 2019 12:15:52 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:41125) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iAG0z-0004YE-BQ for qemu-devel@nongnu.org; Tue, 17 Sep 2019 12:07:42 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iAG0y-000756-9M for qemu-devel@nongnu.org; Tue, 17 Sep 2019 12:07:41 -0400 Received: from relay.sw.ru ([185.231.240.75]:53062) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iAG0t-00072R-7G; Tue, 17 Sep 2019 12:07:35 -0400 Received: from [10.94.3.0] (helo=kvm.qa.sw.ru) by relay.sw.ru with esmtp (Exim 4.92.2) (envelope-from ) id 1iAG0q-0003UJ-B3; Tue, 17 Sep 2019 19:07:32 +0300 From: Vladimir Sementsov-Ogievskiy To: qemu-block@nongnu.org Date: Tue, 17 Sep 2019 19:07:30 +0300 Message-Id: <20190917160731.10895-2-vsementsov@virtuozzo.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190917160731.10895-1-vsementsov@virtuozzo.com> References: <20190917160731.10895-1-vsementsov@virtuozzo.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 185.231.240.75 Subject: [Qemu-devel] [PATCH v12 1/2] block/backup: fix max_transfer handling for copy_range 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: kwolf@redhat.com, vsementsov@virtuozzo.com, qemu-devel@nongnu.org, qemu-stable@nongnu.org, mreitz@redhat.com, den@openvz.org, jsnow@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Of course, QEMU_ALIGN_UP is a typo, it should be QEMU_ALIGN_DOWN, as we are trying to find aligned size which satisfy both source and target. Also, don't ignore too small max_transfer. In this case seems safer to disable copy_range. Fixes: 9ded4a0114968e Signed-off-by: Vladimir Sementsov-Ogievskiy --- block/backup.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/block/backup.c b/block/backup.c index 763f0d7ff6..d8fdbfadfe 100644 --- a/block/backup.c +++ b/block/backup.c @@ -741,12 +741,16 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs, job->cluster_size = cluster_size; job->copy_bitmap = copy_bitmap; copy_bitmap = NULL; - job->use_copy_range = !compress; /* compression isn't supported for it */ job->copy_range_size = MIN_NON_ZERO(blk_get_max_transfer(job->common.blk), blk_get_max_transfer(job->target)); - job->copy_range_size = MAX(job->cluster_size, - QEMU_ALIGN_UP(job->copy_range_size, - job->cluster_size)); + job->copy_range_size = QEMU_ALIGN_DOWN(job->copy_range_size, + job->cluster_size); + /* + * Compression is not supported for copy_range. Also, we don't want to + * handle small max_transfer for copy_range (which currently don't + * handle max_transfer at all). + */ + job->use_copy_range = !compress && job->copy_range_size > 0; /* Required permissions are already taken with target's blk_new() */ block_job_add_bdrv(&job->common, "target", target, 0, BLK_PERM_ALL, -- 2.21.0