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 78ED8C65C30 for ; Sun, 7 Oct 2018 06:27:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 228FA20882 for ; Sun, 7 Oct 2018 06:27:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 228FA20882 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 S1726396AbeJGNc5 (ORCPT ); Sun, 7 Oct 2018 09:32:57 -0400 Received: from mout.gmx.net ([212.227.15.19]:43907 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726297AbeJGNc5 (ORCPT ); Sun, 7 Oct 2018 09:32:57 -0400 Received: from [0.0.0.0] ([210.140.77.29]) by mail.gmx.com (mrgmx001 [212.227.17.184]) with ESMTPSA (Nemesis) id 0MPDaC-1g4eoL0EBk-004WgU; Sun, 07 Oct 2018 08:26:41 +0200 Received: from [0.0.0.0] ([210.140.77.29]) by mail.gmx.com (mrgmx001 [212.227.17.184]) with ESMTPSA (Nemesis) id 0MPDaC-1g4eoL0EBk-004WgU; Sun, 07 Oct 2018 08:26:41 +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> 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: <64cd61fe-5e78-6201-f4b2-e88efba139bc@gmx.com> Date: Sun, 7 Oct 2018 14:26:37 +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="fe6ACkAzwEcIkE9bwYUSMevJB2UKZgNcA" X-Provags-ID: V03:K1:0psW1uR0GL5VjWc0Pm8TI9cebJFgMJUGG7jMnmsIRmBW8Su/3Bd hJ3lhALJxftGVTzp2GRlbYKbHPto6LigAX8RuFCLxbG4ahInPk9bYgsrYLhnFV4gPnw94Ec Yu0u7H/1ME8RJqQDiDNXsxTlQiFpNuQ7Qs2c4Ua4A3/xK2H2eSDzeq9rncFSt9mKKVrVYMA iTYkWDNAQ0Qk3c1AjG3Gw== X-UI-Out-Filterresults: notjunk:1;V01:K0:u9UFyYKnw1A=:w4E12bjf7e0aQH5x3KaKqp 3onfFVoNbXdump1ymXre10dBvg/BHIOCf9q7a+apnbqblbTL7QQ3qkzoR4YP/GcR8db9iAYxq 6YIwFkXg28jBnW/Fc9HQkb4VTBLrKsIrliuf+iY2qYyLyNOcZRVPbjEkVdNoJ81p87Dz3f8Wc PkfYhKaoTdS+Bcaq9Ff4Zz00iMIXZ7qcSECZcM5++hnJ0X+P6AALyG/TIjq/aVVIiF0U83/W6 09G94/Wyl2/ER5LvfwbbbdFd//LrRlSEFkVnBmfiW8sQ5gSjUedYWTB/cYttdNIkm4f+21M9z Rb3RueTfiQ/9mAWQclhRQWapCJUywdqALYgv0IOPoXvl32hFigU3H87AeYORAxMU+MrKZj9RI avxsEXDck9vQNTJY55+L1ii+j8amDWaH/xmaCvV+M6MrebkIq6D/X1h29aFeFS1/ecFHaxaB6 nH0/bdXvBLfdPNYzObrx7FNTBjLyP/L5xbe3loCdZOkpSswTwgh8dSxYdvaBH40O2qr9yNOKR Vi5YUySQ+ufaEV/vcPUC2oqX7O+CVQ6oL+qWvBIyc9/xFn35V0SaoMHBvn+PpU8kmqh7KmEIE arIc/c3MTapjTH3YosaNGTg5KRR9rtV+bDCR463/Plz1L+U+t3soee9jD3JjlMXjkeI7maHDQ MoFWzFE3DFyrnePbytQWrNQGqS+bgkCUiEh/HCdWNXYwDGaiRIwuPaonW/oofarM0ItnMaJUP Ue7ZUb3sNB+Z2gJUQUZ85OPofeSyqGMSGyAZu/GyrkaLdpDxXhUe85pG0ikux3ScNxiNvmKnu yq1nRQE/1MEEeUhJwxuTW9jtoYPeA== 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) --fe6ACkAzwEcIkE9bwYUSMevJB2UKZgNcA Content-Type: multipart/mixed; boundary="g4jlecV2RWJ0iW57u6ycE3fv2u5huZwLB"; protected-headers="v1" From: Qu Wenruo To: evan d Cc: linux-btrfs@vger.kernel.org Message-ID: <64cd61fe-5e78-6201-f4b2-e88efba139bc@gmx.com> Subject: Re: Two partitionless BTRFS drives no longer seen as containing BTRFS filesystem References: <54132790-3f56-ef0f-d818-4f62f0b0a608@gmx.com> In-Reply-To: --g4jlecV2RWJ0iW57u6ycE3fv2u5huZwLB 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=882:10, evan d wrote: >> Please try "btrfs ins dump-super -fFa" on these two disks. >> >> If it's only the primary superblock corrupted, the backup should be go= od. >> >> If backup is also corrupted, either it has some offset or the whole da= ta >> is corrupted. >=20 > # btrfs ins dump-super -fFa /dev/sdb > superblock: bytenr=3D65536, device=3D/dev/sdb > --------------------------------------------------------- > csum_type 0 (crc32c) > csum_size 4 > csum 0x00000000 [DON'T MATCH] > bytenr 0 > flags 0x0 > magic ........ [DON'T MATCH] [snip] > superblock: bytenr=3D274877906944, device=3D/dev/sdb > --------------------------------------------------------- > csum_type 26294 (INVALID) > csum_size 32 > csum 0x05401fa3a3e8cd64075ce9fdbb9e60a01d58061a3cff3bc0235d18912ab755a2= > [UNKNOWN CSUM TYPE OR SIZE] > bytenr 7401042280310172376 > flags 0x5a8a759265673a05 > ( WRITTEN | > METADUMP | > unknown flag: 0x5a8a759065673a04 ) > magic .~...6.. [DON'T MATCH] [snip] None of your super blocks has correct magic. This means either your whole disk get corrupted, or something introduced some offset. Please try the following commands to dump more data around super blocks, so we could be able to find the possible offset: # dd if=3D/dev/sdb of=3Dpossible_sb_range.raw bs=3D1M count=3D128 # grep -obUaP "\x5F\x42\x48\x52\x66\x53\x5F\x4D" possible_sb_range. For a valid btrfs without any offset, the result should look like: 65600:_BHRfS_M 67108928:_BHRfS_M If your result doesn't look like this but still has two similar hits, then you could calculate the offset, and use dm-linear to remap the disk and try to recover the fs. Thanks, Qu --g4jlecV2RWJ0iW57u6ycE3fv2u5huZwLB-- --fe6ACkAzwEcIkE9bwYUSMevJB2UKZgNcA Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEELd9y5aWlW6idqkLhwj2R86El/qgFAlu5px0ACgkQwj2R86El /qh9nwgAlwCQb/s+xlmihPIgOW+5An242JIPWLWIlRLX0hW/X7mMooXardoSe4sX Ai3NTyGyTOp+Su1ypKt9Q7gtQAgE2gyTDHVCLFlvmoBSnC6o7XhZ1Q+XCezxZkbB WnU+x8hMEeCV/UBeei+Ji9XoulwrbnxfczhGwFZjyoIe5/VCWjzUuFrJkyRYbic1 IQxnZby3v1hzFe4GL0xcXNrlZZGnQ/rOvNK2ppsqhPgmI9AZYMk6l6XiObIcpYbM QV2BYr6hKrcXj1JTR4XgawyKh8vx5Ij2Gb7DRRQ4nDAmKtZAgT+NunaXkRjBrWBc n3gzpXjvwjFNUxn+AuJQ3Ysaxbp7Bg== =Ljr7 -----END PGP SIGNATURE----- --fe6ACkAzwEcIkE9bwYUSMevJB2UKZgNcA--