From patchwork Sun Jun 28 11:02:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alberto Garcia X-Patchwork-Id: 11630009 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 8DF8F60D for ; Sun, 28 Jun 2020 11:11:37 +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 6447720B80 for ; Sun, 28 Jun 2020 11:11:37 +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="lsk0/TMq" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6447720B80 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]:43488 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jpVDk-0003Zs-JR for patchwork-qemu-devel@patchwork.kernel.org; Sun, 28 Jun 2020 07:11:36 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:47808) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jpV64-0006y3-Mh; Sun, 28 Jun 2020 07:03:40 -0400 Received: from fanzine.igalia.com ([178.60.130.6]:42246) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jpV5x-0000WZ-VG; Sun, 28 Jun 2020 07:03:40 -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=x44WykpORUb7jKPsPZokuc5MU7JgoaeSdWXwYoNGUz0=; b=lsk0/TMqHOHLkoV/eVCBo7690IotqousTYlwxI/aaGaownTjjpX95yvW+B/GdWynqjSQ3sZwZmkwwSGQB3rWXMzf93ITnAjtAmgZo1ZU1DoLfSHY5qxSSHPsRcDbvFjOkEblso3crkYegVThTMwLuVLFTpGYX0qLQ4itU2t/ckMq9/vA2ii8ZWvJ5e+lOjPuelMgXOQxps/u5xWi48EEgU/bW45u3ZNs4j4AuVkFg+103owweKecrG8miiHKBBbHBFTzaaQpGSvYY8DNNu4tuAoOHoma1+GoRTNMvAhMcKcaqhab5KMbCxxFVz4WhPRrBxNhKc/N4Sejx8reEtHuYQ==; Received: from 26.red-79-158-236.dynamicip.rima-tde.net ([79.158.236.26] helo=perseus.local) by fanzine.igalia.com with esmtpsa (Cipher TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim) id 1jpV5X-0002gO-Db; Sun, 28 Jun 2020 13:03:07 +0200 Received: from berto by perseus.local with local (Exim 4.92) (envelope-from ) id 1jpV5H-00038F-I6; Sun, 28 Jun 2020 13:02:51 +0200 From: Alberto Garcia To: qemu-devel@nongnu.org Subject: [PATCH v9 04/34] qcow2: Split cluster_needs_cow() out of count_cow_clusters() Date: Sun, 28 Jun 2020 13:02:13 +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 = 2020/06/28 07:03:08 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, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN 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 , Vladimir Sementsov-Ogievskiy , Alberto Garcia , qemu-block@nongnu.org, Derek Su , Max Reitz Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" We are going to need it in other places. Signed-off-by: Alberto Garcia Reviewed-by: Vladimir Sementsov-Ogievskiy Reviewed-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 61ad638bdc..80f9787461 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -1087,6 +1087,24 @@ static void calculate_l2_meta(BlockDriverState *bs, QLIST_INSERT_HEAD(&s->cluster_allocs, *m, next_in_flight); } +/* 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 allocating * write, but require COW to be performed (this includes yet unallocated space, @@ -1099,25 +1117,11 @@ static int count_cow_clusters(BlockDriverState *bs, int nb_clusters, for (i = 0; i < nb_clusters; i++) { uint64_t l2_entry = be64_to_cpu(l2_slice[l2_index + i]); - QCow2ClusterType cluster_type = qcow2_get_cluster_type(bs, l2_entry); - - 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(); } } -out: assert(i <= nb_clusters); return i; }