From nobody Sun Feb 8 20:23:38 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=1593342501; cv=none; d=zohomail.com; s=zohoarc; b=k5PAPyBC+nhN50S0neojmCv0TmEHfHWDo8rpz1NVH67kNg4PqxRZWRCj56cpVvw+zxeUPyyv3W49rM7VU5KY6sihHBmS6q4MhQ4uwugHxveaYVBIFckZDWo6omG/f2PHWvZpRTsiiTkBDTHDRvQmWYrq5v/+fSe9DZWla6wFxqk= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1593342501; 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=3TcxrFGVkCtUtsIcvfPDHVNJ3SGTTueaU2gMyJDgFo0=; b=DXwOqWzrgJ8XWaeXh6kTDc1oJt8BLK8QnXfN2jcX58g3q5z+FvP3TVkzE+5c50TXLnwXiEmptjU/5H7le7wW2BtLJ78nx7K28E3054THzG9TgQVFJWhFKEYdxA6L78qE/kle9+f7zlZOGpFGSvyofXMAsol/9nMoT61yynYpjCI= 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 1593342501718117.22274947220694; Sun, 28 Jun 2020 04:08:21 -0700 (PDT) Received: from localhost ([::1]:56592 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jpVAa-0005b6-Eg for importer@patchew.org; Sun, 28 Jun 2020 07:08:20 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:48394) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jpV6M-0007L1-M9; Sun, 28 Jun 2020 07:03:58 -0400 Received: from fanzine.igalia.com ([178.60.130.6]:42321) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1jpV6I-0000X6-Nf; Sun, 28 Jun 2020 07:03:58 -0400 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 1jpV5Y-0002gZ-50; Sun, 28 Jun 2020 13:03:09 +0200 Received: from berto by perseus.local with local (Exim 4.92) (envelope-from ) id 1jpV5H-00038X-Rv; Sun, 28 Jun 2020 13:02:51 +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=3TcxrFGVkCtUtsIcvfPDHVNJ3SGTTueaU2gMyJDgFo0=; b=kAdiWIX5g7XcMZjxPQJkESRShwLT4Wcg69KMhp7aUVPmL/5IQMnqnjaahP9H2J16qs7KC0ZLHPGWsWr17UDAbYKk69aHBWhNUx9b/6SrFwiilXj78BBZsI97yfkWe+p6Jij31Gsnp/FpFDZ3Ro5x6vTfoOmUtgVoW0BH2g27Min5n5q40E1BXNwG8EyJKsN+Q8CrzoT+ofiBhgrlsTRmX+Nq482JOAdxuDuVr4WiNI/0ZT4u7IkRaakLyUGkyV5sKtKaibaUmmx3O7baXlkeSx/0Kosps0A22TCh3lGvj100kaJp7XvhwIsNHTx5V5t1ZHNYWzlMqfiuLmF2PGHZnw==; From: Alberto Garcia To: qemu-devel@nongnu.org Subject: [PATCH v9 13/34] qcow2: Update get/set_l2_entry() and add get/set_l2_bitmap() Date: Sun, 28 Jun 2020 13:02:22 +0200 Message-Id: <40ed71f2147221dc6c29b6603cb4a35db599d0fa.1593342067.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 = 2020/06/28 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+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 Reviewed-by: Max Reitz --- block/qcow2.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/block/qcow2.h b/block/qcow2.h index 46b351229a..82b86f6cec 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