From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AA6D1C28EB4 for ; Thu, 6 Jun 2019 10:41:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 801BC2083E for ; Thu, 6 Jun 2019 10:41:46 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="XRdCqkli" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727124AbfFFKlq (ORCPT ); Thu, 6 Jun 2019 06:41:46 -0400 Received: from mail-pf1-f193.google.com ([209.85.210.193]:40601 "EHLO mail-pf1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726935AbfFFKlq (ORCPT ); Thu, 6 Jun 2019 06:41:46 -0400 Received: by mail-pf1-f193.google.com with SMTP id u17so1256700pfn.7 for ; Thu, 06 Jun 2019 03:41:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=to:cc:from:subject:message-id:date:user-agent:mime-version :content-language:content-transfer-encoding; bh=C2Xwg0LTcVtWta6MedAqslGdpCP35r6qoFQeBUfFvJs=; b=XRdCqkli/2iJYos16PDRy8iKn4VDYMfWZmYiaBxMpJcGQgKnbogQv8DpdyzArAd2ZC +zvQQslFRVkp9Df9iYHOjA4vURm6eOBNJkmNfyRa50kgrBL+1yU1di5HZ8Hey+BWxbvO qE3csgFw6eoAQ6l84npYMRtukRfHJvoYHzOoYKHyBhZb4jX2DNaDfQpTtK4ri5CC+XFG nSJPbRtlYIxzbIF9LdNA42QOA7c3lANuIpWRFum9D6aNY1aScUlzAbVWv5X4SwEuIDW4 0JBOt4bBiBOOnuZ0xySEPsQipUaMoG70OPPILH8VHsHPNUFN9SZS1rDLQAkmQhzq81Im eySA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:to:cc:from:subject:message-id:date:user-agent :mime-version:content-language:content-transfer-encoding; bh=C2Xwg0LTcVtWta6MedAqslGdpCP35r6qoFQeBUfFvJs=; b=Pzto8qzA84GTBV4uTPS8LUpdIrhQ4pHzXHNp1H1IiP4LCY7yaxaZKLn9Nyqs4z8M9A GsaycT3DwLyIVxiPv7w2RVaaftGhdruhi7v5Xr0ey8rA2IC0NQYlH6ShgUyJHUSyG1MR dg5+GO7+VhWP5fMNdZGsBz9WKYQLy+3HoI831CgDsHmjHqhLfZcqUFreVZavk93/n8UT 3nF9uorIagTYEQaGSj+z226r2ItRa0vU/WghKWVn3lYVM2j/EkDnF5+Wnds08M3DhQIl hGR+TTQFoBD27j8/ZQ4PIuMNJSows/PWnCE/F4y3z95espee5HUcMOuESQr+hLDzP5a9 OmsQ== X-Gm-Message-State: APjAAAXXaS5bLYA67/BARKMangC5eSWcPEMHSP3Wd6XQSdwFtCYTrHQa HX3hlDMcD3YdDhTjfzNhaT+tdO32 X-Google-Smtp-Source: APXvYqyhKB7Rp2Uuzl/91/8BlWPBwoEQqKZ2PXU2ynVM8EFemgV0KeHqvldrbTWVxhvOW7DYkNBvww== X-Received: by 2002:a17:90a:ac11:: with SMTP id o17mr42070328pjq.134.1559817705342; Thu, 06 Jun 2019 03:41:45 -0700 (PDT) Received: from [0.0.0.0] ([47.244.216.228]) by smtp.gmail.com with ESMTPSA id b23sm1853562pfi.6.2019.06.06.03.41.43 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 06 Jun 2019 03:41:44 -0700 (PDT) To: linux-ext4@vger.kernel.org Cc: tytso@mit.edu, adilger.kernel@dilger.ca From: Jianchao Wang Subject: [HELP] What are the allocated blocks on a newly created ext4 fs ? Message-ID: Date: Thu, 6 Jun 2019 18:41:42 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Thunderbird/67.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org Dear all After I newly created a ext4 fs and check the mb_group, #group: free frags first [ 2^0 2^1 2^2 2^3 2^4 2^5 2^6 2^7 2^8 2^9 2^10 2^11 2^12 2^13 ] #0 : 23513 1 9255 [ 1 0 0 1 1 0 1 1 1 1 0 1 1 2 ] #1 : 31743 1 1025 [ 1 1 1 1 1 1 1 1 1 1 0 1 1 3 ] ^^^^ #2 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ] #3 : 31743 1 1025 [ 1 1 1 1 1 1 1 1 1 1 0 1 1 3 ] #4 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ] #5 : 31743 1 1025 [ 1 1 1 1 1 1 1 1 1 1 0 1 1 3 ] #6 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ] #7 : 31743 1 1025 [ 1 1 1 1 1 1 1 1 1 1 0 1 1 3 ] #8 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ] #9 : 31743 1 1025 [ 1 1 1 1 1 1 1 1 1 1 0 1 1 3 ] #10 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ] #11 : 32768 1 0 [ 0 0 0 0 0 0 0 0 0 0 0 0 0 4 ] There are some bgs that have 1024 blocks allocated. What are they for ? Many thanks in advance Jianchao