From patchwork Tue May 5 17:38:21 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alberto Garcia X-Patchwork-Id: 11529717 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 ACCA514C0 for ; Tue, 5 May 2020 17:43:46 +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 82136206CC for ; Tue, 5 May 2020 17:43:46 +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="Kms9Wt9G" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 82136206CC 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]:51248 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jW1bd-0005KH-Kr for patchwork-qemu-devel@patchwork.kernel.org; Tue, 05 May 2020 13:43:45 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:44084) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jW1Xd-0006qb-2m; Tue, 05 May 2020 13:39:37 -0400 Received: from fanzine.igalia.com ([178.60.130.6]:38902) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jW1Xb-0008A1-J6; Tue, 05 May 2020 13:39:36 -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=OzcuQ93stjNT5Z/5Ct91V4VOKF7GOZGb/iVq4+6tkDk=; b=Kms9Wt9G/GmkpZI2BOJv2MtskZ4eCCv8hJ/b9XXaqOn7sQvhYzl6srm3HVm7lZu3MEZ5n7ien6umfXxTIuQ6PKRtyR0yOBaRj3B6PDCmjfUtjEv2hnAs4CeTF6X7MU1BRNP9BFZgpo/DgoFuaVYe4EI/Pf/VGVyQOr27STC6hEi5ptK7XYqR4OYRkMAZt7yMkchuVGDmdFiVOPd8tBmD7V05igKcvJPtQ8WzRR0pngi8llcHcRpMVNsmtVL0tcC593xl2R0y0Gjfn+B0kScvZ1dS0DtQoSBHZbaJr3iCICeUE2tdmR66cW0HhKwfelaP+rriBWS2umgcmn4mRquEjg==; Received: from static.160.43.0.81.ibercom.com ([81.0.43.160] helo=perseus.local) by fanzine.igalia.com with esmtpsa (Cipher TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim) id 1jW1Ws-00025U-ER; Tue, 05 May 2020 19:38:50 +0200 Received: from berto by perseus.local with local (Exim 4.92) (envelope-from ) id 1jW1Wd-00044D-3r; Tue, 05 May 2020 19:38:35 +0200 From: Alberto Garcia To: qemu-devel@nongnu.org Subject: [PATCH v5 21/31] qcow2: Add subcluster support to zero_in_l2_slice() Date: Tue, 5 May 2020 19:38:21 +0200 Message-Id: <6d0481b79b5ecf9e3ba1496ef550e1e830073de6.1588699789.git.berto@igalia.com> 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 = 2020/05/05 13:38:50 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_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, Max Reitz Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" The QCOW_OFLAG_ZERO bit that indicates that a cluster reads as zeroes is only used in standard L2 entries. Extended L2 entries use individual 'all zeroes' bits for each subcluster. This must be taken into account when updating the L2 entry and also when deciding that an existing entry does not need to be updated. Signed-off-by: Alberto Garcia --- block/qcow2-cluster.c | 36 +++++++++++++++++++----------------- 1 file changed, 19 insertions(+), 17 deletions(-) diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index f500cbfb8e..bf32ed0825 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -1913,7 +1913,6 @@ static int zero_in_l2_slice(BlockDriverState *bs, uint64_t offset, int l2_index; int ret; int i; - bool unmap = !!(flags & BDRV_REQ_MAY_UNMAP); ret = get_cluster_table(bs, offset, &l2_slice, &l2_index); if (ret < 0) { @@ -1925,28 +1924,31 @@ static int zero_in_l2_slice(BlockDriverState *bs, uint64_t offset, assert(nb_clusters <= INT_MAX); for (i = 0; i < nb_clusters; i++) { - uint64_t old_offset; - QCow2ClusterType cluster_type; + uint64_t old_l2_entry = get_l2_entry(s, l2_slice, l2_index + i); + uint64_t old_l2_bitmap = get_l2_bitmap(s, l2_slice, l2_index + i); + QCow2ClusterType type = qcow2_get_cluster_type(bs, old_l2_entry); + bool unmap = (type == QCOW2_CLUSTER_COMPRESSED) || + ((flags & BDRV_REQ_MAY_UNMAP) && qcow2_cluster_is_allocated(type)); + uint64_t new_l2_entry = unmap ? 0 : old_l2_entry; + uint64_t new_l2_bitmap = old_l2_bitmap; - old_offset = get_l2_entry(s, l2_slice, l2_index + i); + if (has_subclusters(s)) { + new_l2_bitmap = QCOW_L2_BITMAP_ALL_ZEROES; + } else { + new_l2_entry |= QCOW_OFLAG_ZERO; + } - /* - * Minimize L2 changes if the cluster already reads back as - * zeroes with correct allocation. - */ - cluster_type = qcow2_get_cluster_type(bs, old_offset); - if (cluster_type == QCOW2_CLUSTER_ZERO_PLAIN || - (cluster_type == QCOW2_CLUSTER_ZERO_ALLOC && !unmap)) { + if (old_l2_entry == new_l2_entry && old_l2_bitmap == new_l2_bitmap) { continue; } qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_slice); - if (cluster_type == QCOW2_CLUSTER_COMPRESSED || unmap) { - set_l2_entry(s, l2_slice, l2_index + i, QCOW_OFLAG_ZERO); - qcow2_free_any_clusters(bs, old_offset, 1, QCOW2_DISCARD_REQUEST); - } else { - uint64_t entry = get_l2_entry(s, l2_slice, l2_index + i); - set_l2_entry(s, l2_slice, l2_index + i, entry | QCOW_OFLAG_ZERO); + if (unmap) { + qcow2_free_any_clusters(bs, old_l2_entry, 1, QCOW2_DISCARD_REQUEST); + } + set_l2_entry(s, l2_slice, l2_index + i, new_l2_entry); + if (has_subclusters(s)) { + set_l2_bitmap(s, l2_slice, l2_index + i, new_l2_bitmap); } }