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=-2.3 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, USER_AGENT_SANE_1 autolearn=no 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 18FC9CA9EAF for ; Mon, 21 Oct 2019 11:46:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id DD59F20656 for ; Mon, 21 Oct 2019 11:46:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="udbYnAFz" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728513AbfJULqA (ORCPT ); Mon, 21 Oct 2019 07:46:00 -0400 Received: from mail-wm1-f66.google.com ([209.85.128.66]:37898 "EHLO mail-wm1-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727962AbfJULqA (ORCPT ); Mon, 21 Oct 2019 07:46:00 -0400 Received: by mail-wm1-f66.google.com with SMTP id 3so12453178wmi.3; Mon, 21 Oct 2019 04:45:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to :user-agent; bh=U1IQDTvaARLaVd24Zh1gpxsP2o000LM9KsLDvNwZvKQ=; b=udbYnAFz3mD3r3OJh4xHUpdLPntC2rn4pFfjH00JZZ95zXQ0TSvGeadqdngti7yNIW 27MmJWPjyi+NdwWWrKVEKKrNJWRKvB6j7i7JymGAs43sQXsg9oMy5v7Ni9hN8ewjXdX/ TMpjxI0C8FcNJP5K0x8lU1XFTpFPS82GCjZ/hemdfR5ybFaqZI1F/Uf304m8WPZa2RAn mh0lBHvie4hMRxls50k9uAqAxYv+uJXoUWG04gGGSXU6vX6RqDc5uy4o+0cwEnAreSvt YKhbjdJrnIOauaFHucVeNOUQjmfQnxHzSyJmi3xFh6LR9YngDl4HMdZGuWfsgxI9fh+K lw8A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to:user-agent; bh=U1IQDTvaARLaVd24Zh1gpxsP2o000LM9KsLDvNwZvKQ=; b=J4PqtAW+KdbhOmrPN3KhU9M8YnruRC+Wcs36aDUJ0BuKE5J6ZDdVajuFIRExlE1WnS 6e3TCfUxteY57BYo94UIgXqwYUKnEdn6XHFh861H/SUZSCsWNFJhPZgMLHo7z0pf08RR S3pW/OKrW2qhDvywMkPd2gSBvl04P/x2PvkAo1xjrf/eNf0mRLkJ+oenWHo19hUKj2XQ UAxIru477MYJNLGjxOMdkYJRCX+6HNFJU6pEuohgYjBlW22elZpOqXUODl8VkqX/DkrG P25e/JX1NZ8jKMLUrkE80NDP+P/keltpgMcsn27m2Gtsyc9Y2BiaKw2+0u/BmpIG0KeW Zqnw== X-Gm-Message-State: APjAAAW4wipKcEwuN+o0koLuY85DAiFr4yg1oFChL5iDFv35V85BCk4c 7XQE4e1a9Scg7ZsP7ziqqQw= X-Google-Smtp-Source: APXvYqxC5UL9u14Na2lUyp+kQoJTcCXOoxOAUG3UCJ3rO8yKGOC8uc0v2t5Cx4sGQYBIOx7EkapfFQ== X-Received: by 2002:a1c:f210:: with SMTP id s16mr17178705wmc.24.1571658358398; Mon, 21 Oct 2019 04:45:58 -0700 (PDT) Received: from pali ([2a02:2b88:2:1::5cc6:2f]) by smtp.gmail.com with ESMTPSA id c16sm986112wrw.32.2019.10.21.04.45.57 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Mon, 21 Oct 2019 04:45:57 -0700 (PDT) Date: Mon, 21 Oct 2019 13:45:56 +0200 From: Pali =?utf-8?B?Um9ow6Fy?= To: Maurizio Lombardi Cc: Konstantin Komarov , "viro@zeniv.linux.org.uk" , "linux-kernel@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" Subject: Re: [PATCH] fs: exFAT read-only driver GPL implementation by Paragon Software. Message-ID: <20191021114556.lk2zkha57xmav7xz@pali> References: <453A1153-9493-4A04-BF66-CE6A572DEBDB@paragon-software.com> <20191021111136.adpxjxmmz4p2vud2@pali> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: NeoMutt/20170113 (1.7.2) Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On Monday 21 October 2019 13:37:13 Maurizio Lombardi wrote: > So, 2 FAT tables are probably not sufficient for recovery, 2 bitmaps are needed too. Yes, I know. But code which I referred check both number of fat tables and number of allocation bitmaps (as they are represented by one member in boot sector structure). > Btw, only Windows CE supported this. Is this information based on some real tests? Or just from marketing or Microsoft's information? (I would really like to know definite answer in this area). Because Microsoft says one thing in their FAT32 specification, second thing described in their FAT implementation and thing thing is how it is really implemented (in fatfast.sys kernel driver which is open source). So I would be really careful about how MS's exfat.sys implementation is working. -- Pali Rohár pali.rohar@gmail.com