From patchwork Sat Oct 26 21:25:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alberto Garcia X-Patchwork-Id: 11213899 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 A9DDE112C for ; Sat, 26 Oct 2019 22:06:07 +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 72C1E2084C for ; Sat, 26 Oct 2019 22:06:07 +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="Eduf1FZT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 72C1E2084C 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]:42922 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iOUCE-0007xb-2P for patchwork-qemu-devel@patchwork.kernel.org; Sat, 26 Oct 2019 18:06:06 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:60041) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iOTZj-00005M-IN for qemu-devel@nongnu.org; Sat, 26 Oct 2019 17:26:20 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iOTZi-0005Ll-Cs for qemu-devel@nongnu.org; Sat, 26 Oct 2019 17:26:19 -0400 Received: from fanzine.igalia.com ([178.60.130.6]:42517) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1iOTZg-0005F8-8r; Sat, 26 Oct 2019 17:26:16 -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=+teRwcTtaXOtgOnZDFyQBDrNtNjcR0EiU6GJjnVH5ig=; b=Eduf1FZTqHyIAzBK3nZ58bPHvEaFIwgacfytYyNUcy36nwMI/qlmV704hWnGPuqP49xavKRNby+4zfHMW53ByZPVtrLYLxCpgycsQRgX8Ft6hlitFYrnxqvjloDEj9NT0c/qu4aEkrfT88uN08gXNOwdtdsiA6g3jQ9w3gKhcqVc/yuOT3kSswp0Z6dH4aUmC4vBLh7jKCxn8S/DYY60Z89Mq9e5Qd/QZQF34A49MlWOMSDVog5QLmI+PHmrmnedhdCUvopoT+s/0o1rMZRdZWnozoG0PqsFnIy+ODTuFbJJ9BAghV3GxILSVWtuiYAiUmE7HZ+HjVug1oxYg0FdlQ==; Received: from 87-100-137-117.bb.dnainternet.fi ([87.100.137.117] helo=perseus.local) by fanzine.igalia.com with esmtpsa (Cipher TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim) id 1iOTZI-00045t-Ll; Sat, 26 Oct 2019 23:25:52 +0200 Received: from berto by perseus.local with local (Exim 4.92) (envelope-from ) id 1iOTZ0-0001PG-CN; Sun, 27 Oct 2019 00:25:34 +0300 From: Alberto Garcia To: qemu-devel@nongnu.org Subject: [RFC PATCH v2 08/26] qcow2: Add offset_to_sc_index() Date: Sun, 27 Oct 2019 00:25:10 +0300 Message-Id: X-Mailer: git-send-email 2.20.1 In-Reply-To: References: MIME-Version: 1.0 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 , Vladimir Sementsov-Ogievskiy , "Denis V . Lunev" Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" For a given offset, return the subcluster number within its cluster (i.e. with 32 subclusters per cluster it returns a number between 0 and 31). Signed-off-by: Alberto Garcia --- block/qcow2.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/block/qcow2.h b/block/qcow2.h index 278ca41314..e25758079c 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -559,6 +559,11 @@ static inline int offset_to_l2_slice_index(BDRVQcow2State *s, int64_t offset) return (offset >> s->cluster_bits) & (s->l2_slice_size - 1); } +static inline int offset_to_sc_index(BDRVQcow2State *s, int64_t offset) +{ + return (offset >> s->subcluster_bits) & (s->subclusters_per_cluster - 1); +} + static inline int64_t qcow2_vm_state_offset(BDRVQcow2State *s) { return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);