From patchwork Thu Sep 3 16:37:48 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alberto Garcia X-Patchwork-Id: 11754299 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D1C6A739 for ; Thu, 3 Sep 2020 16:40:41 +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 A2DDD206A5 for ; Thu, 3 Sep 2020 16:40:41 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=igalia.com header.i=@igalia.com header.b="A8G6QCwU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A2DDD206A5 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=igalia.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:58544 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kDsHw-0006uY-JL for patchwork-qemu-devel@patchwork.kernel.org; Thu, 03 Sep 2020 12:40:40 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42654) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kDsFb-0002Gu-9T; Thu, 03 Sep 2020 12:38:15 -0400 Received: from fanzine.igalia.com ([178.60.130.6]:40621) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kDsFZ-0003v1-3e; Thu, 03 Sep 2020 12:38:14 -0400 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=Dhx9hX0levtP/jPZ7VqO61MeCwOwD1gQmuwN0FfN37U=; b=A8G6QCwUQ8YbT61yUHCGmYEOYfnCx3zQD6QUenQUm4r/uo1/ev1LgVa19lqYe1T2oJQJim+5/cxF+Y0h5s+PlhFI5s9hzghB9WIz2r/q+KGo4BU622D9uRDYdSe6CovkEJjp6zDlnowJebZS+0VAsU5Ph0ywZV6yEPV8KFq8p/hBvpUmjnHiQPQy0TRgZkYYgRAVQn8CYNJabAgtpxeM9zQ0+E54S5Cm6Bpa5xzTmyL7wYwtk4l2ucfyt5paF0YEg+Q/cDXLbggxdIdxtHAtArt+1BqA0c6zFHUIEiHfR33eEflC3EyPqsgTJfVKOSkiZrJN9cobriJg8nSYVtGwVw==; Received: from [81.0.33.67] (helo=perseus.local) by fanzine.igalia.com with esmtpsa (Cipher TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim) id 1kDsFW-0002F9-7T; Thu, 03 Sep 2020 18:38:10 +0200 Received: from berto by perseus.local with local (Exim 4.92) (envelope-from ) id 1kDsFJ-00082k-3l; Thu, 03 Sep 2020 18:37:57 +0200 From: Alberto Garcia To: qemu-devel@nongnu.org Subject: [PATCH v2 2/3] qcow2: Don't check nb_clusters when removing l2meta from the list Date: Thu, 3 Sep 2020 18:37:48 +0200 Message-Id: X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 Received-SPF: pass client-ip=178.60.130.6; envelope-from=berto@igalia.com; helo=fanzine.igalia.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/03 12:38:03 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x (no timestamps) [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Kevin Wolf , Alberto Garcia , qemu-block@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" In the past, when a new cluster was allocated the l2meta structure was a variable in the stack so it was necessary to have a way to tell whether it had been initialized and contained valid data or not. The nb_clusters field was used for this purpose. Since commit f50f88b9fe this is no longer the case, l2meta (nowadays a pointer to a list) is only allocated when needed and nb_clusters is guaranteed to be > 0 so this check is unnecessary. Signed-off-by: Alberto Garcia --- block/qcow2.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/block/qcow2.c b/block/qcow2.c index da56b1a4df..54a7d2f475 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -2112,9 +2112,7 @@ static coroutine_fn int qcow2_handle_l2meta(BlockDriverState *bs, } /* Take the request off the list of running requests */ - if (l2meta->nb_clusters != 0) { - QLIST_REMOVE(l2meta, next_in_flight); - } + QLIST_REMOVE(l2meta, next_in_flight); qemu_co_queue_restart_all(&l2meta->dependent_requests);