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[108.201.186.146]) by smtp.gmail.com with ESMTPSA id 64sm8394681pfy.114.2021.08.20.19.56.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 20 Aug 2021 19:56:15 -0700 (PDT) Subject: Re: Trying to recover data from SSD To: Qu Wenruo 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> From: Konstantin Svist Message-ID: <7e8394c9-9eb3-c593-9473-5c40d80428a5@gmail.com> Date: Fri, 20 Aug 2021 19:56:13 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <60a21bca-d133-26c0-4768-7d9a70f9d102@gmx.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 8/11/21 18:18, Qu Wenruo wrote: > > > On 2021/8/12 上午6:34, Konstantin Svist wrote: >> >> Shouldn't there be an earlier generation of this subvolume's tree block >> 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 >                 backup_tree_root:       30687232        gen: 2317 >  level: 0 >                 backup_tree_root:       30834688        gen: 2318 >  level: 0 >                 backup_tree_root:       30408704        gen: 2319 >  level: 0 >                 backup_tree_root:       31031296        gen: 2316 >  level: 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?