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=-0.5 required=3.0 tests=FREEMAIL_FORGED_FROMDOMAIN, FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 A7452C65C30 for ; Sun, 7 Oct 2018 08:19:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 69A702088F for ; Sun, 7 Oct 2018 08:19:22 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 69A702088F Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=gmx.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-btrfs-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727940AbeJGPZu (ORCPT ); Sun, 7 Oct 2018 11:25:50 -0400 Received: from mout.gmx.net ([212.227.15.18]:40891 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726427AbeJGPZt (ORCPT ); Sun, 7 Oct 2018 11:25:49 -0400 Received: from [0.0.0.0] ([210.140.77.29]) by mail.gmx.com (mrgmx002 [212.227.17.184]) with ESMTPSA (Nemesis) id 0Ldq55-1fRF9b48J9-00j2o5; Sun, 07 Oct 2018 10:19:18 +0200 Received: from [0.0.0.0] ([210.140.77.29]) by mail.gmx.com (mrgmx002 [212.227.17.184]) with ESMTPSA (Nemesis) id 0Ldq55-1fRF9b48J9-00j2o5; Sun, 07 Oct 2018 10:19:18 +0200 Subject: Re: Two partitionless BTRFS drives no longer seen as containing BTRFS filesystem To: evan d Cc: linux-btrfs@vger.kernel.org References: <54132790-3f56-ef0f-d818-4f62f0b0a608@gmx.com> <64cd61fe-5e78-6201-f4b2-e88efba139bc@gmx.com> <2122b08c-0fa9-b774-cbad-67b71f5084d4@gmx.com> From: Qu Wenruo Openpgp: preference=signencrypt Autocrypt: addr=quwenruo.btrfs@gmx.com; prefer-encrypt=mutual; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNIlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT7CwJQEEwEIAD4CGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCWdWCnQUJCWYC bgAKCRDCPZHzoSX+qAR8B/94VAsSNygx1C6dhb1u1Wp1Jr/lfO7QIOK/nf1PF0VpYjTQ2au8 ihf/RApTna31sVjBx3jzlmpy+lDoPdXwbI3Czx1PwDbdhAAjdRbvBmwM6cUWyqD+zjVm4RTG rFTPi3E7828YJ71Vpda2qghOYdnC45xCcjmHh8FwReLzsV2A6FtXsvd87bq6Iw2axOHVUax2 FGSbardMsHrya1dC2jF2R6n0uxaIc1bWGweYsq0LXvLcvjWH+zDgzYCUB0cfb+6Ib/ipSCYp 3i8BevMsTs62MOBmKz7til6Zdz0kkqDdSNOq8LgWGLOwUTqBh71+lqN2XBpTDu1eLZaNbxSI ilaVzsBNBFnVga8BCACqU+th4Esy/c8BnvliFAjAfpzhI1wH76FD1MJPmAhA3DnX5JDORcga CbPEwhLj1xlwTgpeT+QfDmGJ5B5BlrrQFZVE1fChEjiJvyiSAO4yQPkrPVYTI7Xj34FnscPj /IrRUUka68MlHxPtFnAHr25VIuOS41lmYKYNwPNLRz9Ik6DmeTG3WJO2BQRNvXA0pXrJH1fN GSsRb+pKEKHKtL1803x71zQxCwLh+zLP1iXHVM5j8gX9zqupigQR/Cel2XPS44zWcDW8r7B0 q1eW4Jrv0x19p4P923voqn+joIAostyNTUjCeSrUdKth9jcdlam9X2DziA/DHDFfS5eq4fEv ABEBAAHCwHwEGAEIACYWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCWdWBrwIbDAUJA8JnAAAK CRDCPZHzoSX+qA3xB/4zS8zYh3Cbm3FllKz7+RKBw/ETBibFSKedQkbJzRlZhBc+XRwF61mi f0SXSdqKMbM1a98fEg8H5kV6GTo62BzvynVrf/FyT+zWbIVEuuZttMk2gWLIvbmWNyrQnzPl mnjK4AEvZGIt1pk+3+N/CMEfAZH5Aqnp0PaoytRZ/1vtMXNgMxlfNnb96giC3KMR6U0E+siA 4V7biIoyNoaN33t8m5FwEwd2FQDG9dAXWhG13zcm9gnk63BN3wyCQR+X5+jsfBaS4dvNzvQv h8Uq/YGjCoV1ofKYh3WKMY8avjq25nlrhzD/Nto9jHp8niwr21K//pXVA81R2qaXqGbql+zo Message-ID: <14c82713-72c8-a243-293b-5c482031f70a@gmx.com> Date: Sun, 7 Oct 2018 16:19:13 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="lUetEOkQrXHuEiQLHm2blZgJw4NlSTwPA" X-Provags-ID: V03:K1:N+xk2Ye6XPE1kNSJb1ZqV/LR4Wqea/RS0Te4Pt1J3qKz8/W4IS1 9PNRitYZcCuYvnyvjKgNcDL/+nQxag4MhJFr9nattIjlT9vFrc9FH1ZVdWFUhOM9W/Kvu1g rcpgfI96mnbageQ/mYiKhZ/+RWgYPOtv+YAN2Tz+DwyQT7Wswgj3/oTHopTR4lmnUlqxBFE r2haEgzp2KBYwvjcqXczw== X-UI-Out-Filterresults: notjunk:1;V01:K0:iHfP8Bhu8M8=:YX+k48t4aBVt2PCv6Kn9Xi FxLXTY5W2ohzWJs/gSPrIhssbheIxvPzpDkjWihi9IiHIMKAJQTmCoyAw8e+tx0AbJQLh4LHf jNnq5HOHm9dbVmHCwk1Jp8+61dyhnpqPoimAiWeATGy3ozCbkZSfh20r+L6TfayqkxIiRlaVq DYpuCFqjn6pn9tZKSZvnHUOaUvckqgCpJtRiY3OGIvwwDvyaUXBU+Gcltj6mQ7b+eJzxWxY57 lgluPCBzmz8PdrAgxxzRaerATN5EVixMFbO+k5E3HsvkuYDJvnE202Fxq+AeKByaIqRAVH+Dy MXkFkTkle/BT124hxU7uhHOZd7CoXHPWB1CgsMLoiErwfMulBiAU0CsoDdx/ESSTr3uFxtgzV PD444qG2SBSJ0OdDZLjyV/3jjG3pcolzSUOhSv+xD8N0d98aMIlMe3MQU6ApkDZr3E3/Db3L5 6j5Ak/oQ8VoXgC+Lr0KCHpmjSv7ugPf+YQqxvT5VurFU44qncDJjopb6Hky92FzLMT4mFK6Xi 7TyY4AZk1A+3PDnn4PFs4jRLoVnADEQy+v0LfEPz2/m6CCQOxoYh7+M8HhnhmKhRaFQJo7hsy gDx5Ag/hT8EAmx43rNW0WvXbKniNj1Pp7vws0S/2ZVz1eKMilPR3CNeuR+DaiaAKTmHW3QbYq T3lYjjjoSUx5yeHkhjBSJK4YEm8o4dkriJUEso/+HE2WSGWrC13d9SSmwMpM+qhFxQKtgZdjR V7MCeoTUF6/GPE9o6NkvA5PUgRHgmdmfJpr2Bk73T/RN3SY3j3zUEKd84yPHZ+7Q6lmWHV0x5 5xNWvfrPZjthTQJ5ZNu4QAzkAo9Ag== Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --lUetEOkQrXHuEiQLHm2blZgJw4NlSTwPA Content-Type: multipart/mixed; boundary="XhKHoadgxrhdNHWORWBpZ6dT6aJXISYol"; protected-headers="v1" From: Qu Wenruo To: evan d Cc: linux-btrfs@vger.kernel.org Message-ID: <14c82713-72c8-a243-293b-5c482031f70a@gmx.com> Subject: Re: Two partitionless BTRFS drives no longer seen as containing BTRFS filesystem References: <54132790-3f56-ef0f-d818-4f62f0b0a608@gmx.com> <64cd61fe-5e78-6201-f4b2-e88efba139bc@gmx.com> <2122b08c-0fa9-b774-cbad-67b71f5084d4@gmx.com> In-Reply-To: --XhKHoadgxrhdNHWORWBpZ6dT6aJXISYol Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2018/10/7 =E4=B8=8B=E5=8D=884:09, evan d wrote: >> If first 128M doesn't hit, I highly doubt something more strange happe= ned. >=20 > Not sure I follow, do you mean if it doesn't hit then it's likely > something else went wrong? Yes. If it's just a simple offset, it should hit. If it's some simple corruption like bit rot, it shouldn't cause all super blocks to be corrupted so seriously. >=20 >=20 >> I'm considering something like encryption. >> Maybe the disk is already encrypted by hardware? >=20 > The drives were never encrypted, none of my drives are >=20 >=20 >> Windows is just a black box, I have no idea what a Windows could do to= a >> disk. >> >> But it doesn't explain why the 2nd super block can't be located, unles= s >> Windows is wipe more data than the first 128M. >=20 > I'm thinking Windows may have tried to convert them to Dynamic disk on > detecting them and assuming they're empty. If that's the case, and sharing with Windows can't be avoided, then next time please use partition table (GPT/MBR) other than raw disks. >=20 >> >> If the disk is larger than 256G, would you please try to locate the la= st >> possible super at 256G? >=20 > They're both 6TB drives >=20 >> >> # dd if=3D/dev/sdb bs=3D1M of=3Dlast_chance.raw count=3D128 skip=3D256= M >> # grep -obUaP "\x5F\x42\x48\x52\x66\x53\x5F\x4D" last_chance.raw >=20 > dd returns: > dd: /dev/sdb: cannot skip: Invalid argument My fault, skip should be 256K not 256M. Thanks, Qu >=20 --XhKHoadgxrhdNHWORWBpZ6dT6aJXISYol-- --lUetEOkQrXHuEiQLHm2blZgJw4NlSTwPA Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEELd9y5aWlW6idqkLhwj2R86El/qgFAlu5wYEACgkQwj2R86El /qi6zwgAros80Cw2oVDpYCMjObDqtASe9BcC34JE2DOTvcjTZfhCyf+BD1a1OMDJ zolnST+Zh37QF4ttyUw+OO16885RQPapVP5e3ublPN7Smq+FH1K892NTmexuqoAr NILxtiXSeyMUeKozm+NT4dyDkuAWp8SAm+9PUHVAAxWDmmz23THQDZGuUGWxkRzk wknZmZ0O0/G8ySUeQhoM+87iwkdB4EeU+na5x8525CUjnkmj0gWpetp8XOpmE0z1 iTGGKhBqrRDP+1Iv5ndaCYMb2Y5LwwwDYsAv0LHGVif07XXXJr5HLnsw/qzW3M0Y d7GzmrcoU/G4uV1ZX5OISwtf5Tx/5Q== =YXFy -----END PGP SIGNATURE----- --lUetEOkQrXHuEiQLHm2blZgJw4NlSTwPA--