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=-2.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,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 75DDBC432BE for ; Sat, 28 Aug 2021 06:16:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 44A3260E93 for ; Sat, 28 Aug 2021 06:16:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232702AbhH1GRL (ORCPT ); Sat, 28 Aug 2021 02:17:11 -0400 Received: from mout.gmx.net ([212.227.15.15]:39583 "EHLO mout.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229555AbhH1GRK (ORCPT ); Sat, 28 Aug 2021 02:17:10 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gmx.net; s=badeba3b8450; t=1630131379; bh=pDxa2H7uWB1VwxRgm93qcKuE9e+ItwqkwFa6a+tr38k=; h=X-UI-Sender-Class:Subject:To:Cc:References:From:Date:In-Reply-To; b=KSfeNUNSaEI0vrQgnU1n8DzQyTkLMBdY6HKDDilHHDV1/UTJS1oOYO2Dqy92P0Q94 3JFgDSIJyqrXi0BzNkfy7bMph4WlyIdcBtG49ld398Byqgfw0zuL2Su3fbLGGHgB46 lgcRqjwUBMmxBuiB8LsUhTYCK8gueYOemq1pDu8M= X-UI-Sender-Class: 01bb95c1-4bf8-414a-932a-4f6e2808ef9c Received: from [0.0.0.0] ([149.28.201.231]) by mail.gmx.net (mrgmx004 [212.227.17.184]) with ESMTPSA (Nemesis) id 1MSt8W-1mS5Ns0ieE-00UKrJ; Sat, 28 Aug 2021 08:16:19 +0200 Subject: Re: Trying to recover data from SSD To: Konstantin Svist Cc: Btrfs BTRFS References: <67691486-9dd9-6837-d485-30279d3d3413@gmail.com> <46f3b990-ec2d-6508-249e-8954bf356e89@gmx.com> <04ce5d53-3028-16a3-cc1d-ee4e048acdba@gmx.com> <7f42b532-07b4-5833-653f-bef148be5d9a@gmail.com> <1c066a71-bc66-3b12-c566-bac46d740960@gmx.com> <544e3e73-5490-2cae-c889-88d80e583ac4@gmail.com> <2684f59f-679d-5ee7-2591-f0a4ea4e9fbe@gmx.com> <238d1f6c-20a9-f002-e03a-722175c63bd6@gmail.com> <4bd90f4a-7ced-3477-f113-eee72bc05cbb@gmx.com> <60a21bca-d133-26c0-4768-7d9a70f9d102@gmx.com> <7e8394c9-9eb3-c593-9473-5c40d80428a5@gmail.com> <1785017b-e23b-e93d-5b78-2aa40170fe62@gmail.com> From: Qu Wenruo Message-ID: <14a9a98c-50fc-eb7b-804b-2fe36775b5fa@gmx.com> Date: Sat, 28 Aug 2021 14:16:13 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: <1785017b-e23b-e93d-5b78-2aa40170fe62@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:pJqj29H5+rBylnTia6hXBr8M4fZ7nd4rI3JlZvJmxpqqzSauTVS nZ6mNA7zI3yU5GokggBVlkd0e1Gx4bqz/Gi+q/EB16e5MokRpbT9ClAqRHn5VbJSAMIwAWE xiZY91umIYYRAEcSB5EhBc0Zl2yhLykHp3kzGWBZnHH9vc1ZLdYSfJWAmZAL5bbqX5jR4kb B8cQy9zR0KPzG6XX0Er7Q== X-UI-Out-Filterresults: notjunk:1;V03:K0:aXaJl7nh5Zg=:SuJpFek4w7ZkUQ6Cn70G3X LyJUpzZcwZDXNyAACUDmRk/7Vk4uk6TvX2eZrwuXyFrFlmnuWTFSAesp1G3ih9KtngTePcaBp kd81aqD3vmxFsB3dweFxmSkLrdE+gjlQstogfOKvm5hEBnLH0RxzIAXAv3/6H7lb+YK3+FtQ8 pyiSvNXIG9H9lNK0PtJ5aO26lmxwEH1cxcJD6+OIJQLxCxSkx63jSzoH8/Fd8qH8Sqa2E0MeT DEK4FTuf2tNPUEWlbywAswcYdYmrMYS67JoaLswoKJQn4pjWMFSCFXH+U5madqMR+GukCDV1Y 9Qt7hSsnk6TxIzJyVn5IUDLGsGEHQkthJh1q8Zm7BSVeE5zYP7RgCef1hRfuEYcJqyaBNyI39 Oa4bBWtqyofUDO5xuxg4Wv/3/JeyrNWqa5Ov5o9UDe7pvYgb/s8BSoicrvNZ6DiktRwUIO9kF PUyhMXR5ickNzXe7m188QN5raSLbsRhjMe5LFMo8vW5N7bICHsVZn0GXooJPqnS7Pa6pHeh2b yJc/5tUB6XVsrIo2zd4URxixEV4lSRYte46fwkTildG2IPns7A9wZbvJxc0AsQONwvwo5pmwG KdT3aLUhM9OSkPL2WOlr1lXdnKST1e6/aqxSUkjB+skB6R1r7mFeC6Fkx4XKJV+F50Z0U09Tc T+IAFf1CPAQnXJRZFkMom/R7aGtsE1j69dPazn/iLgkLuNEY1FWJW97i83qQsOC9vW9xkJZLi c8FOXpMo5yLYHRdxeA+L4cpzttjVOn1uqkr90+J5I5z/cmcuZBbYkEs483wngo6sG2GE+o754 ZAkoBxYKjTFfN1u2N5RWl50Ovb3vII4DBlLrEDAVDjsro8GAAZPKNLgZRIUQQ3x4t/f4tui11 TxTja2HfiUWppb+DXcQjjKcMgVSKppmJVPRefJMdU/Pek6z9R64SHJRm6I4dlEudXEz6kYvuO AWgPX0NcWrVn/NAOICU41Xs0l3j0cIj2xoPWDIyS7wkRj2IDKxSvtpYm3RM/BPp2k706Apksg GKJv3vXCaLIuIfyFe5ZWwxFwV1G4+DCffBUoJJAO8UegUggrG4awondT6YHeP+iHiI9FGLmco x8X9LUMJctwLPyDOhHbR92vo+PhOrnq5N5L+QR5B6+jmWqBBxqA9mBsfQ== Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 2021/8/28 =E4=B8=8B=E5=8D=881:57, Konstantin Svist wrote: > On 8/20/21 19:56, Konstantin Svist wrote: >> On 8/11/21 18:18, Qu Wenruo wrote: >>> >>> On 2021/8/12 =E4=B8=8A=E5=8D=886:34, Konstantin Svist wrote: >>>> Shouldn't there be an earlier generation of this subvolume's tree blo= ck >>>> somewhere on the disk? Would all of them have gotten overwritten >>>> already? >>> Then it will be more complex and I can't ensure any good result. >> >> It was already pretty complex and results were never guaranteed :) >> >> >>> Firstly you need to find an older root tree: >>> >>> # btrfs ins dump-super -f /dev/sdb3 | grep backup_tree_root >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 backup_tree_root:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 30687232=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 gen: 2317 >>> =C2=A0level: 0 >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 backup_tree_root:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 30834688=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 gen: 2318 >>> =C2=A0level: 0 >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 backup_tree_root:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 30408704=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 gen: 2319 >>> =C2=A0level: 0 >>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0 backup_tree_root:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0 31031296=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 gen: 2316 >>> =C2=A0level: 0 >>> >>> Then try the bytenr in their reverse generation order in btrfs ins >>> dump-tree: >>> (The latest one should be the current root, thus you can skip it) >>> >>> # btrfs ins dump-tree -b 30834688 /dev/sdb3 | grep "(257 ROOT_ITEM" -A= 5 >>> >>> Then grab the bytenr of the subvolume 257, then pass the bytenr to >>> btrfs-restore: >>> >>> # btrfs-restore -f /dev/sdb3 >>> >>> The chance is already pretty low, good luck. >>> >>> Thanks, >>> Qu >> >> >> When I run dump-tree, I get this: >> >> # btrfs ins dump-tree -b 787070976 /dev/sdb3 | grep "(257 ROOT_ITEM" -A= 5 >> checksum verify failed on 786939904 wanted 0xcdcdcdcd found 0xc375d6b6 >> checksum verify failed on 786939904 wanted 0xcdcdcdcd found 0xc375d6b6 >> checksum verify failed on 786939904 wanted 0xcdcdcdcd found 0xc375d6b6 >> Csum didn't match >> WARNING: could not setup extent tree, skipping it >> >> The same exact offset fails checksum for all 4 backup roots, any way >> around this? When without the grep, is there any output? Thanks, Qu > > > *ping* > > Any hope left here? >