From patchwork Sun Dec 22 11:36:49 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alberto Garcia X-Patchwork-Id: 11307373 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 AC56A139A for ; Sun, 22 Dec 2019 11:42:55 +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 826D620665 for ; Sun, 22 Dec 2019 11:42:55 +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="H2f527j8" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 826D620665 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]:46677 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iizdN-0000jy-0D for patchwork-qemu-devel@patchwork.kernel.org; Sun, 22 Dec 2019 06:42:54 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:43680) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iizZ9-0003Le-0t for qemu-devel@nongnu.org; Sun, 22 Dec 2019 06:38:32 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iizZ7-0006nW-JO for qemu-devel@nongnu.org; Sun, 22 Dec 2019 06:38:30 -0500 Received: from fanzine.igalia.com ([178.60.130.6]:34944) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1iizZ7-0004Oq-73; Sun, 22 Dec 2019 06:38:29 -0500 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=v7Z/v/trFlU1y5ia2m4/ef6xOxYRQRjvg+MxQ8Ut/g0=; b=H2f527j8iAryF6Yn3y3JAtt4IRw5+koAqlY7i59Z0b7Qu9fDrGplAgI9MSCQSgnJp1jzlarCbu53nOnZPqKJRv7rmYHnbtR9sL0ZFo+yhU5KegLLe6IgVTnnG2Xe9MHjPbrYxahcOnjow9ZPzqOgEo16hATlM15sD855mBn8GJk4zlms+1YPFdhKvv0iIoZf7r5wuY171tVkKHM5nyjYfKK7rOYniU8I8n29wjd1EZaNt25eMyE4p2UFsheh4OfqTty0t5qZxi6Trlv6UddmndEc3BbybISPL4g/TtgJ2vjWrtqql33xkVu0SgdluwD+PE98eI7tlZ5mCglio9zLZA==; Received: from [80.30.182.172] (helo=perseus.local) by fanzine.igalia.com with esmtpsa (Cipher TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim) id 1iizYU-0005dA-IL; Sun, 22 Dec 2019 12:37:50 +0100 Received: from berto by perseus.local with local (Exim 4.92) (envelope-from ) id 1iizXu-0001Vi-Et; Sun, 22 Dec 2019 12:37:14 +0100 From: Alberto Garcia To: qemu-devel@nongnu.org Subject: [RFC PATCH v3 08/27] qcow2: Add offset_to_sc_index() Date: Sun, 22 Dec 2019 12:36:49 +0100 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 Reviewed-by: Max Reitz --- block/qcow2.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/block/qcow2.h b/block/qcow2.h index 941330cfc9..523bc489a5 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -566,6 +566,11 @@ 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);