From nobody Tue Apr 8 23:33:35 2025 Delivered-To: importer@patchew.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=1598344520; cv=none; d=zohomail.com; s=zohoarc; b=m/JG+pLhbsgo3uSLhHCclF0W/eyhLe/jf3DjVXT13vQkPxBaoM5be6XijROAUvhdj40V1vBWLEgnrycUy41dS4Lvc3mtSwcK95kae8yudAKD0AUcGr4GbibNDoYgA+8P1x0ktewXK2CxqSW8Q1OlvTMTnWmcRhX+o1egD56S/z4= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1598344520; 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=ViHT/7ZTomgP37rzGc3b2UbGviX2f300qg6NzE4R/n8=; b=GsHSc/d1wOOOOpn7FQR+Cg7WJ+JvSi0hvbgMFJ+loe7JseKYrzqFd4vARyqQ6DMfalQ1YQHkmV6pQBZlDZch3g/J+uApOV3QM8hyUlXcVonJAZ45S2qmc0THam15nEnKYT4HFXbcoFubDX/RxZFcqFQVJzV0KHs2lmo6ybAhzSg= 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 1598344520936309.6196936108221; Tue, 25 Aug 2020 01:35:20 -0700 (PDT) Received: from localhost ([::1]:44274 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kAUQJ-0006VP-Mi for importer@patchew.org; Tue, 25 Aug 2020 04:35:19 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:59854) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kAUOW-00033F-PX for qemu-devel@nongnu.org; Tue, 25 Aug 2020 04:33:28 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:48405 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kAUOV-0000Yq-2V for qemu-devel@nongnu.org; Tue, 25 Aug 2020 04:33:28 -0400 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-170-khKs1lm7O5STWu6duG92Tw-1; Tue, 25 Aug 2020 04:33:23 -0400 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id AE6B318A2250; Tue, 25 Aug 2020 08:33:22 +0000 (UTC) Received: from localhost (ovpn-113-72.ams2.redhat.com [10.36.113.72]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 4AD8519144; Tue, 25 Aug 2020 08:33:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1598344406; 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=ViHT/7ZTomgP37rzGc3b2UbGviX2f300qg6NzE4R/n8=; b=ScGKk2ir+uepJnKYh1zyfgdt4VDomgFRGvJUXHPEDVv8tCuzIQvEC18ui16dy5dN212O32 RKeWRo1gBP9IW0DQSkQ/ESAplkzgzvEV04RbddFxtdZK5s/zaUqN59lSoonwgb6SfKuOgi I+uo5au1q0T4R6uIih8YQz+rn3O3R2c= X-MC-Unique: khKs1lm7O5STWu6duG92Tw-1 From: Max Reitz To: qemu-block@nongnu.org Subject: [PULL 04/34] qcow2: Split cluster_needs_cow() out of count_cow_clusters() Date: Tue, 25 Aug 2020 10:32:41 +0200 Message-Id: <20200825083311.1098442-5-mreitz@redhat.com> In-Reply-To: <20200825083311.1098442-1-mreitz@redhat.com> References: <20200825083311.1098442-1-mreitz@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=mreitz@redhat.com X-Mimecast-Spam-Score: 0.001 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable 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; Received-SPF: pass client-ip=205.139.110.120; envelope-from=mreitz@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/25 02:05:08 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.956, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, 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 , Peter Maydell , qemu-devel@nongnu.org, Max Reitz 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" From: Alberto Garcia We are going to need it in other places. Signed-off-by: Alberto Garcia Reviewed-by: Vladimir Sementsov-Ogievskiy Reviewed-by: Max Reitz Message-Id: <65e5d9627ca2ebe7e62deaeddf60949c33067d9d.1594396418.git.berto@= igalia.com> Signed-off-by: Max Reitz --- block/qcow2-cluster.c | 34 +++++++++++++++++++--------------- 1 file changed, 19 insertions(+), 15 deletions(-) diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index 6447222ba0..369689b27c 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -1088,6 +1088,24 @@ static void calculate_l2_meta(BlockDriverState *bs, QLIST_INSERT_HEAD(&s->cluster_allocs, *m, next_in_flight); } =20 +/* Returns true if writing to a cluster requires COW */ +static bool cluster_needs_cow(BlockDriverState *bs, uint64_t l2_entry) +{ + switch (qcow2_get_cluster_type(bs, l2_entry)) { + case QCOW2_CLUSTER_NORMAL: + if (l2_entry & QCOW_OFLAG_COPIED) { + return false; + } + case QCOW2_CLUSTER_UNALLOCATED: + case QCOW2_CLUSTER_COMPRESSED: + case QCOW2_CLUSTER_ZERO_PLAIN: + case QCOW2_CLUSTER_ZERO_ALLOC: + return true; + default: + abort(); + } +} + /* * Returns the number of contiguous clusters that can be used for an alloc= ating * write, but require COW to be performed (this includes yet unallocated s= pace, @@ -1100,25 +1118,11 @@ static int count_cow_clusters(BlockDriverState *bs,= int nb_clusters, =20 for (i =3D 0; i < nb_clusters; i++) { uint64_t l2_entry =3D be64_to_cpu(l2_slice[l2_index + i]); - QCow2ClusterType cluster_type =3D qcow2_get_cluster_type(bs, l2_en= try); - - switch(cluster_type) { - case QCOW2_CLUSTER_NORMAL: - if (l2_entry & QCOW_OFLAG_COPIED) { - goto out; - } + if (!cluster_needs_cow(bs, l2_entry)) { break; - case QCOW2_CLUSTER_UNALLOCATED: - case QCOW2_CLUSTER_COMPRESSED: - case QCOW2_CLUSTER_ZERO_PLAIN: - case QCOW2_CLUSTER_ZERO_ALLOC: - break; - default: - abort(); } } =20 -out: assert(i <=3D nb_clusters); return i; } --=20 2.26.2