From nobody Mon Feb 9 10:57:28 2026 Delivered-To: importer@patchew.org Received-SPF: pass (zoho.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 (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org ARC-Seal: i=1; a=rsa-sha256; t=1571153222; cv=none; d=zoho.com; s=zohoarc; b=h6J5iz44ji+6nKbQfk/SHf3251RSmdy2ON1V2pxkwy09GDXydJP1jlw/+U6EzwsGS4hRH3RcN8AYYoos4/mCkdu892JStXwJxLocGn/9W9jbMS90VwczuIXngr+IVJDUWGmHrPDxvFZPQkRkVZN66E3w/fVaGr7oBlokWymNf2U= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zoho.com; s=zohoarc; t=1571153222; h=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=PwQd/y4S0FBQizWvZQAHM2WnDJ0t7VTyKQq0iYWEjWI=; b=Vv4qr2DjPBiZ49pPftstjN0bKOakr56vQuqt9gUugwHD5SCvBeQ9q+z/4e3fHaNBZTuYnDx8RwbBBt6utL1/cL99KOwoSN8w2DXL+59QmBL8kVhRVdeD/KBcR6BJQ57aOEKJ9ea5H+wkRt1HNSXpDdcOOcbHBHt7eo0uLphM6jU= ARC-Authentication-Results: i=1; mx.zoho.com; dkim=fail; spf=pass (zoho.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1571153222271984.0374395935147; Tue, 15 Oct 2019 08:27:02 -0700 (PDT) Received: from localhost ([::1]:48700 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iKOiy-0005Dk-Im for importer@patchew.org; Tue, 15 Oct 2019 11:27:00 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:48075) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iKOgy-0002kq-7e for qemu-devel@nongnu.org; Tue, 15 Oct 2019 11:24:57 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iKOgw-0003fP-Qn for qemu-devel@nongnu.org; Tue, 15 Oct 2019 11:24:55 -0400 Received: from fanzine.igalia.com ([178.60.130.6]:47105) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1iKOgw-0003ZF-4w; Tue, 15 Oct 2019 11:24:54 -0400 Received: from 82-181-115-92.bb.dnainternet.fi ([82.181.115.92] helo=perseus.local) by fanzine.igalia.com with esmtpsa (Cipher TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim) id 1iKOge-0003ad-1k; Tue, 15 Oct 2019 17:24:36 +0200 Received: from berto by perseus.local with local (Exim 4.92) (envelope-from ) id 1iKOfn-00061j-09; Tue, 15 Oct 2019 18:23:43 +0300 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=PwQd/y4S0FBQizWvZQAHM2WnDJ0t7VTyKQq0iYWEjWI=; b=eZ4srQEvncVNHcdLWXmHguaadSgn3/Obl2xjqHZmSuv0usdICsMdamij6aekLQiWzOGxlTk3C9eEg0rnh0u5uU93Qh4gRuxqPgdE1tG2KRPssNy5YCTt6p/XiY0MZ+cUXHO6FHvYOfUzDLlOIvf6Iab1XC7Q8ZGrFWejyy3FKdD8A13fJ32Kwy8PYwXHNHoirvkUjG5IKGLtTiQ59rLRx7Z8KseSt3XPEcH/uhYxSi0k6LbGYeiz3gKAQbp4ZRGfspfe+40YsT6qb94JMNrgLnkKhBAOtIz/9uwZ8EzjQS8Z11bdYpjeFUvEPRFJ3Dg6YCOHVw+4iGfLeiI3nYS4lg==; From: Alberto Garcia To: qemu-devel@nongnu.org Subject: [RFC PATCH 16/23] qcow2: Add subcluster support to discard_in_l2_slice() Date: Tue, 15 Oct 2019 18:23:27 +0300 Message-Id: X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x (no timestamps) [generic] [fuzzy] X-Received-From: 178.60.130.6 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 , Anton Nefedov , Alberto Garcia , qemu-block@nongnu.org, Max Reitz , "Denis V . Lunev" 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" Setting the QCOW_OFLAG_ZERO bit of the L2 entry is forbidden if an image has subclusters. Instead, the individual 'all zeroes' bits must be used. Signed-off-by: Alberto Garcia --- block/qcow2-cluster.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/block/qcow2-cluster.c b/block/qcow2-cluster.c index c554b1a88c..bf32447d18 100644 --- a/block/qcow2-cluster.c +++ b/block/qcow2-cluster.c @@ -1769,7 +1769,11 @@ static int discard_in_l2_slice(BlockDriverState *bs,= uint64_t offset, =20 /* First remove L2 entries */ qcow2_cache_entry_mark_dirty(s->l2_table_cache, l2_slice); - if (!full_discard && s->qcow_version >=3D 3) { + if (has_subclusters(s)) { + set_l2_entry(s, l2_slice, l2_index + i, 0); + set_l2_bitmap(s, l2_slice, l2_index + i, + full_discard ? 0 : QCOW_L2_BITMAP_ALL_ZEROES); + } else if (!full_discard && s->qcow_version >=3D 3) { set_l2_entry(s, l2_slice, l2_index + i, QCOW_OFLAG_ZERO); } else { set_l2_entry(s, l2_slice, l2_index + i, 0); --=20 2.20.1