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[108.201.186.146]) by smtp.gmail.com with ESMTPSA id om9sm3306432pjb.40.2021.08.10.09.12.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 10 Aug 2021 09:12:14 -0700 (PDT) Subject: Re: Trying to recover data from SSD To: Qu Wenruo Cc: Btrfs BTRFS , Zygo Blaxell References: <67691486-9dd9-6837-d485-30279d3d3413@gmail.com> <46f3b990-ec2d-6508-249e-8954bf356e89@gmx.com> <04ce5d53-3028-16a3-cc1d-ee4e048acdba@gmx.com> From: Konstantin Svist Message-ID: <7f42b532-07b4-5833-653f-bef148be5d9a@gmail.com> Date: Tue, 10 Aug 2021 09:12:12 -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: <04ce5d53-3028-16a3-cc1d-ee4e048acdba@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 >> I don't know how to do that (corrupt the extent tree) > > There is the more detailed version: > https://lore.kernel.org/linux-btrfs/744795fa-e45a-110a-103e-13caf597299a@gmx.com/ So, here's what I get: # btrfs ins dump-tree -t root /dev/sdb3 |grep -A5 'item 0 key (EXTENT_TREE'     item 0 key (EXTENT_TREE ROOT_ITEM 0) itemoff 15844 itemsize 439         generation 166932 root_dirid 0 bytenr 786939904 level 2 refs 1         lastsnap 0 byte_limit 0 bytes_used 50708480 flags 0x0(none)         uuid 00000000-0000-0000-0000-000000000000         drop key (0 UNKNOWN.0 0) level 0     item 1 key (DEV_TREE ROOT_ITEM 0) itemoff 15405 itemsize 439 # btrfs-map-logical -l 786939904 /dev/sdb3 checksum verify failed on 952483840 wanted 0x00000000 found 0xb6bde3e4 checksum verify failed on 952483840 wanted 0x00000000 found 0xb6bde3e4 checksum verify failed on 952483840 wanted 0x00000000 found 0xb6bde3e4 bad tree block 952483840, bytenr mismatch, want=952483840, have=0 ERROR: failed to read block groups: Input/output error Open ctree failed Sooooo.. now what..?