From: Felipe Monteiro de Carvalho Subject: Re: Beginner questions about ext4 Date: Sun, 23 Jun 2013 06:29:18 +0000 (UTC) Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit To: linux-ext4@vger.kernel.org Return-path: Received: from plane.gmane.org ([80.91.229.3]:47726 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750759Ab3FWG3f (ORCPT ); Sun, 23 Jun 2013 02:29:35 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1Uqdnq-0008NS-Bc for linux-ext4@vger.kernel.org; Sun, 23 Jun 2013 08:29:34 +0200 Received: from user-164-127-35-163.play-internet.pl ([164.127.35.163]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 23 Jun 2013 08:29:34 +0200 Received: from felipemonteiro.carvalho by user-164-127-35-163.play-internet.pl with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 23 Jun 2013 08:29:34 +0200 Sender: linux-ext4-owner@vger.kernel.org List-ID: Hello, I can now already answer some of my questions, thought others not: > In ext3 did each block group contain always 1 block? > If not, then how many? This information is in ext4_super_block.s_blocks_per_group > 2> I see that the number of groups inside a flexible group is > given by 2^sb.s_log_groups_per_flex but: > a> Every single group is a flexible group or some are and some now? I am still very much interesting in knowing this! Are all groups flexible groups when FLEX_BG feature is activated? I found this image for how things relate to one another without flex_bg: http://origin-ars.els-cdn.com/content/image/1-s2.0-S1742287612000357-gr1.jpg Does anyone know if there is a simular image with flex_bg??? thanks, Felipe Monteiro de Carvalho