From nobody Mon Feb 9 04:23:39 2026 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 ARC-Seal: i=1; a=rsa-sha256; t=1590430263; cv=none; d=zohomail.com; s=zohoarc; b=dvqWVqr+QmpWf8oTEYs9pC3CzZDxC4N1XzW5bF/+koc7YPiJU7mSZCwRn4EU5iaTKz2JfiePAU9FOdkWawmW9o/rMe/aFvC66jzvyyepe83ciXxRtbvdssBrq8iD22Z9o2sojqLGSDGFcdqVoIcfi1x2cfhC38sa76xlIU02TAQ= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1590430263; 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=dSAwgrC5LcZQ3krB+gWwLZ8JUpx3fYlvZcBDWK37T9E=; b=h7CMuFgGzmlC7/0H9RXQjUXhG7qUdSzE8TfyCIwq61+jg/VAuwoipUGNUUzkaWqj1ILHVaXnragAHh7HdK3XiWQZqCSk+gsR76aFNYBmak833ZhSqQbCu0YImt9ojvvbVVrO97tP8WMH7RqaoGJol9GEiuAOzDjotQAw/gtzw5g= 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 Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1590430262635493.9840948115958; Mon, 25 May 2020 11:11:02 -0700 (PDT) Received: from localhost ([::1]:45852 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jdHYz-0005PB-98 for importer@patchew.org; Mon, 25 May 2020 14:11:01 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:45086) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jdHXa-0003Ck-1x; Mon, 25 May 2020 14:09:34 -0400 Received: from fanzine.igalia.com ([178.60.130.6]:50956) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jdHXV-0007pd-Dc; Mon, 25 May 2020 14:09:33 -0400 Received: from [81.0.38.199] (helo=perseus.local) by fanzine.igalia.com with esmtpsa (Cipher TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim) id 1jdHXP-00088L-C7; Mon, 25 May 2020 20:09:23 +0200 Received: from berto by perseus.local with local (Exim 4.92) (envelope-from ) id 1jdHX9-0002Mx-S1; Mon, 25 May 2020 20:09:07 +0200 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=dSAwgrC5LcZQ3krB+gWwLZ8JUpx3fYlvZcBDWK37T9E=; b=MN6BmgeAWnvYa4FR8jMtFQpHv+7xk6oDLU9h99tpTzvG7Zb27DnClnrIPwfOw6ssdT6sHopjL9hjY9EwVV3fy/qNOnqyyG0LuihSQm5SRMhP4XlBbq8gGJLbqAbnAsAhTZi36SAgtBw0haQ/9/hKmPUfEObBy7Z4diPy09NKbqn31LuiyHwOYjnNSSEo2Ph0BLGJ0BCWdgqxs5C0gSnHlI/c429OV+02fuJfbjlBFb0oX6CnPMA4A99rz1P05HErclZWnH1Z+DgKN1yi2QPzgvUzkDQ50YOs9rg4iENVSUqzFCgy5l08NuHT1t15gXXGeI49ZJtwd8A4ORwwb62g9Q==; From: Alberto Garcia To: qemu-devel@nongnu.org Subject: [PATCH v7 13/32] qcow2: Update get/set_l2_entry() and add get/set_l2_bitmap() Date: Mon, 25 May 2020 20:08:38 +0200 Message-Id: <1401220aace2c5cd1bfc4cc909e74406a2b32143.1590429901.git.berto@igalia.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 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=178.60.130.6; envelope-from=berto@igalia.com; helo=fanzine.igalia.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/25 14:09:23 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, Derek Su , 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" Extended L2 entries are 128-bit wide: 64 bits for the entry itself and 64 bits for the subcluster allocation bitmap. In order to support them correctly get/set_l2_entry() need to be updated so they take the entry width into account in order to calculate the correct offset. This patch also adds the get/set_l2_bitmap() functions that are used to access the bitmaps. For convenience we allow calling get_l2_bitmap() on images without subclusters. In this case the returned value is always 0 and has no meaning. Signed-off-by: Alberto Garcia Reviewed-by: Eric Blake --- block/qcow2.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/block/qcow2.h b/block/qcow2.h index 95cc16a089..5c6bf48c7a 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -533,15 +533,36 @@ static inline size_t l2_entry_size(BDRVQcow2State *s) static inline uint64_t get_l2_entry(BDRVQcow2State *s, uint64_t *l2_slice, int idx) { + idx *=3D l2_entry_size(s) / sizeof(uint64_t); return be64_to_cpu(l2_slice[idx]); } =20 +static inline uint64_t get_l2_bitmap(BDRVQcow2State *s, uint64_t *l2_slice, + int idx) +{ + if (has_subclusters(s)) { + idx *=3D l2_entry_size(s) / sizeof(uint64_t); + return be64_to_cpu(l2_slice[idx + 1]); + } else { + return 0; /* For convenience only; this value has no meaning. */ + } +} + static inline void set_l2_entry(BDRVQcow2State *s, uint64_t *l2_slice, int idx, uint64_t entry) { + idx *=3D l2_entry_size(s) / sizeof(uint64_t); l2_slice[idx] =3D cpu_to_be64(entry); } =20 +static inline void set_l2_bitmap(BDRVQcow2State *s, uint64_t *l2_slice, + int idx, uint64_t bitmap) +{ + assert(has_subclusters(s)); + idx *=3D l2_entry_size(s) / sizeof(uint64_t); + l2_slice[idx + 1] =3D cpu_to_be64(bitmap); +} + static inline bool has_data_file(BlockDriverState *bs) { BDRVQcow2State *s =3D bs->opaque; --=20 2.20.1