From nobody Sun Feb 8 18:29:19 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; dmarc=fail(p=none dis=none) header.from=redhat.com ARC-Seal: i=1; a=rsa-sha256; t=1574439018; cv=none; d=zohomail.com; s=zohoarc; b=FkP3oSfY5ErPzpXJOrCskQtIyvt9IO9Ii4nEcBvwoF+h4wdVvDF1SEkDedduVv2WdSeETD7ieNEKsssxYVhiqodjJEOZvCnWFRw0wk/07VEzedSt8MTF58Sl8Ev0KU9JFbFTZoO94txMSUgEh7cAfZxVuIbjCuGCdLXpsS79YpQ= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1574439018; h=Content-Type: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=pw2Brk0D+0cTmO+ThyXqjBZwmszkPvwLmjKihJY9kPE=; b=HpflvWzOaWo5t0f75dZLjz25Wl4XYksLL/tCKah7QRKQzlG9XpbRRl6ZeaGR8SdH6o8worI+hAm3yP1Kn52Vv4rnCtusLq2+M+RmivwQ20Bl3JPqAU9vNqkUoe0OafHvZjy75QNbDjOCA+UdQzWKykOOR0OlgHBStw8/j3jZPHU= 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; dmarc=fail header.from= (p=none dis=none) header.from= Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1574439018804572.8050603803788; Fri, 22 Nov 2019 08:10:18 -0800 (PST) Received: from localhost ([::1]:52596 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iYBVf-00066w-Px for importer@patchew.org; Fri, 22 Nov 2019 11:10:15 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:47800) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iYBR4-0000I3-Rr for qemu-devel@nongnu.org; Fri, 22 Nov 2019 11:05:31 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iYBR3-0002l1-NZ for qemu-devel@nongnu.org; Fri, 22 Nov 2019 11:05:30 -0500 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:32604 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iYBR3-0002kj-JL for qemu-devel@nongnu.org; Fri, 22 Nov 2019 11:05:29 -0500 Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-422-Sn5ci1yxPPazAWuIFj5waQ-1; Fri, 22 Nov 2019 11:05:27 -0500 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 6479A1883521; Fri, 22 Nov 2019 16:05:26 +0000 (UTC) Received: from linux.fritz.box.com (ovpn-117-252.ams2.redhat.com [10.36.117.252]) by smtp.corp.redhat.com (Postfix) with ESMTP id BCF1D10372C3; Fri, 22 Nov 2019 16:05:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1574438729; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=pw2Brk0D+0cTmO+ThyXqjBZwmszkPvwLmjKihJY9kPE=; b=cKCFQCkujQabQSuDUGoWW35e29iyMs67Z3k2ENqq9w/jS5/heCkjrAWJyYNdloeFpV2ETj hfqiUwjgjs09DF0CAG2O6N+n5iWtKzWNNnaR/lvxvXvYj7kckbzZWt/zRnn2R8LBVmDPp3 kcghpUAiGIrAjbXpyswMBrbHpt3K8To= From: Kevin Wolf To: qemu-block@nongnu.org Subject: [PATCH v3 3/8] qcow2: Declare BDRV_REQ_NO_FALLBACK supported Date: Fri, 22 Nov 2019 17:05:06 +0100 Message-Id: <20191122160511.8377-4-kwolf@redhat.com> In-Reply-To: <20191122160511.8377-1-kwolf@redhat.com> References: <20191122160511.8377-1-kwolf@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-MC-Unique: Sn5ci1yxPPazAWuIFj5waQ-1 X-Mimecast-Spam-Score: 0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 205.139.110.61 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, mreitz@redhat.com, stefanha@redhat.com 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" In the common case, qcow2_co_pwrite_zeroes() already only modifies metadata case, so we're fine with or without BDRV_REQ_NO_FALLBACK set. The only exception is when using an external data file, where the request is passed down to the block driver of the external data file. We are forwarding the BDRV_REQ_NO_FALLBACK flag there, though, so this is fine, too. Declare the flag supported therefore. Signed-off-by: Kevin Wolf Reviewed-by: Alberto Garcia Reviewed-by: Eric Blake Reviewed-by: Max Reitz --- block/qcow2.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/block/qcow2.c b/block/qcow2.c index b201383c3d..3fa10bf807 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -1722,7 +1722,8 @@ static int coroutine_fn qcow2_do_open(BlockDriverStat= e *bs, QDict *options, } } =20 - bs->supported_zero_flags =3D header.version >=3D 3 ? BDRV_REQ_MAY_UNMA= P : 0; + bs->supported_zero_flags =3D header.version >=3D 3 ? + BDRV_REQ_MAY_UNMAP | BDRV_REQ_NO_FALLBACK := 0; =20 /* Repair image if dirty */ if (!(flags & (BDRV_O_CHECK | BDRV_O_INACTIVE)) && !bs->read_only && --=20 2.20.1