Hi Qu, this is what I got:
root@tuxedo:~# btrfs rescue super-recover /dev/md/1 Make sure this is a btrfs disk otherwise the tool will destroy other fs, Are you sure? [y/N]: y checksum verify failed on 340721664 found EACFB938 wanted 24037BC4 checksum verify failed on 340721664 found EACFB938 wanted 24037BC4 checksum verify failed on 340721664 found CBE54D32 wanted 6010C3E7 checksum verify failed on 340721664 found EACFB938 wanted 24037BC4 bad tree block 340721664, bytenr mismatch, want=340721664, have=14969249826309169724 Couldn't read tree root Failed to recover bad superblocks root@tuxedo:~# btrfs check --readonly /dev/md/1 Opening filesystem to check... No valid Btrfs found on /dev/md/1 ERROR: cannot open file system Additional tips? Mit freundlichen Grüßen/Kind regards Felix Koop > Qu Wenruo <quwenruo.bt...@gmx.com> hat am 24. September 2019 um 11:11 > geschrieben: > > > > > On 2019/9/24 下午4:27, Felix Koop wrote: > > Hi Qu, > > > > unfortunately nothing under dmesg. > > > > ~# btrfs ins dump-super -fFa /dev/md/1 > > superblock: bytenr=65536, device=/dev/md/1 > > --------------------------------------------------------- > > csum_type 48250 (INVALID) > > csum_size 32 > > csum > > 0x8e5542eb70bced2a96808253fcb7a73c6085b6e754cbc8e2fb89674e9f738238 [UNKNOWN > > CSUM TYPE OR SIZE] > > So the first super block is completely garbage, no wonder neither kernel > nor the btrfs-progs detects the fs. > > [...] > > > > > > superblock: bytenr=67108864, device=/dev/md/1 > > --------------------------------------------------------- > > csum_type 0 (crc32c) > > csum_size 4 > > csum 0x636f9da3 [match] > > bytenr 67108864 > > flags 0x1 > > ( WRITTEN ) > > magic _BHRfS_M [match] > > Still have a good backup. > > I'm not sure what makes the first super block completely garbage. It can > be bad trim or whatever something wrong. > > But anyway, you can try to fix it by "btrfs rescue super-recover > /dev/md/1" to at least recover the superblock so that kernel and > btrfs-progs can recognize the system. > > Then you may like to run a "btrfs check --readonly /dev/md/1" to make > sure nothing else is corrupted. > > Thanks, > Qu > > > fsid 6bd5c974-2565-4736-815d-fe071f560e68 > > metadata_uuid 6bd5c974-2565-4736-815d-fe071f560e68 > > label > > generation 168 > > root 340721664 > > sys_array_size 129 > > chunk_root_generation 156 > > root_level 1 > > chunk_root 22020096 > > chunk_root_level 1 > > log_root 0 > > log_root_transid 0 > > log_root_level 0 > > total_bytes 375567417344 > > bytes_used 243939692544 > > sectorsize 4096 > > nodesize 16384 > > leafsize (deprecated) 16384 > > stripesize 4096 > > root_dir 6 > > num_devices 1 > > compat_flags 0x0 > > compat_ro_flags 0x0 > > incompat_flags 0x161 > > ( MIXED_BACKREF | > > BIG_METADATA | > > EXTENDED_IREF | > > SKINNY_METADATA ) > > cache_generation 168 > > uuid_tree_generation 168 > > dev_item.uuid d71e03b8-b353-4242-a65a-dc9d60bc46a6 > > dev_item.fsid 6bd5c974-2565-4736-815d-fe071f560e68 [match] > > dev_item.type 0 > > dev_item.total_bytes 375567417344 > > dev_item.bytes_used 248059527168 > > dev_item.io_align 4096 > > dev_item.io_width 4096 > > dev_item.sector_size 4096 > > dev_item.devid 1 > > dev_item.dev_group 0 > > dev_item.seek_speed 0 > > dev_item.bandwidth 0 > > dev_item.generation 0 > > sys_chunk_array[2048]: > > item 0 key (FIRST_CHUNK_TREE CHUNK_ITEM 22020096) > > length 8388608 owner 2 stripe_len 65536 type SYSTEM|DUP > > io_align 65536 io_width 65536 sector_size 4096 > > num_stripes 2 sub_stripes 0 > > stripe 0 devid 1 offset 22020096 > > dev_uuid d71e03b8-b353-4242-a65a-dc9d60bc46a6 > > stripe 1 devid 1 offset 30408704 > > dev_uuid d71e03b8-b353-4242-a65a-dc9d60bc46a6 > > backup_roots[4]: > > backup 0: > > backup_tree_root: 350814208 gen: 166 > > level: 1 > > backup_chunk_root: 22020096 gen: 156 > > level: 1 > > backup_extent_root: 340721664 gen: 166 > > level: 2 > > backup_fs_root: 338608128 gen: 166 > > level: 2 > > backup_dev_root: 354140160 gen: 166 > > level: 1 > > backup_csum_root: 353402880 gen: 166 > > level: 2 > > backup_total_bytes: 375567417344 > > backup_bytes_used: 243939692544 > > backup_num_devices: 1 > > > > backup 1: > > backup_tree_root: 57311232 gen: 167 > > level: 1 > > backup_chunk_root: 22020096 gen: 156 > > level: 1 > > backup_extent_root: 69419008 gen: 167 > > level: 2 > > backup_fs_root: 338608128 gen: 166 > > level: 2 > > backup_dev_root: 317472768 gen: 167 > > level: 1 > > backup_csum_root: 345784320 gen: 167 > > level: 2 > > backup_total_bytes: 375567417344 > > backup_bytes_used: 243939692544 > > backup_num_devices: 1 > > > > backup 2: > > backup_tree_root: 340721664 gen: 168 > > level: 1 > > backup_chunk_root: 22020096 gen: 156 > > level: 1 > > backup_extent_root: 340738048 gen: 168 > > level: 2 > > backup_fs_root: 338608128 gen: 166 > > level: 2 > > backup_dev_root: 345358336 gen: 168 > > level: 1 > > backup_csum_root: 353320960 gen: 168 > > level: 2 > > backup_total_bytes: 375567417344 > > backup_bytes_used: 243939692544 > > backup_num_devices: 1 > > > > backup 3: > > backup_tree_root: 57311232 gen: 165 > > level: 1 > > backup_chunk_root: 22020096 gen: 156 > > level: 1 > > backup_extent_root: 69419008 gen: 165 > > level: 2 > > backup_fs_root: 352387072 gen: 157 > > level: 2 > > backup_dev_root: 317325312 gen: 165 > > level: 1 > > backup_csum_root: 343932928 gen: 165 > > level: 2 > > backup_total_bytes: 375567417344 > > backup_bytes_used: 243939692544 > > backup_num_devices: 1 > > > > > > superblock: bytenr=274877906944, device=/dev/md/1 > > --------------------------------------------------------- > > csum_type 0 (crc32c) > > csum_size 4 > > csum 0x9ee8cb92 [match] > > bytenr 274877906944 > > flags 0x1 > > ( WRITTEN ) > > magic _BHRfS_M [match] > > fsid 6bd5c974-2565-4736-815d-fe071f560e68 > > metadata_uuid 6bd5c974-2565-4736-815d-fe071f560e68 > > label > > generation 168 > > root 340721664 > > sys_array_size 129 > > chunk_root_generation 156 > > root_level 1 > > chunk_root 22020096 > > chunk_root_level 1 > > log_root 0 > > log_root_transid 0 > > log_root_level 0 > > total_bytes 375567417344 > > bytes_used 243939692544 > > sectorsize 4096 > > nodesize 16384 > > leafsize (deprecated) 16384 > > stripesize 4096 > > root_dir 6 > > num_devices 1 > > compat_flags 0x0 > > compat_ro_flags 0x0 > > incompat_flags 0x161 > > ( MIXED_BACKREF | > > BIG_METADATA | > > EXTENDED_IREF | > > SKINNY_METADATA ) > > cache_generation 168 > > uuid_tree_generation 168 > > dev_item.uuid d71e03b8-b353-4242-a65a-dc9d60bc46a6 > > dev_item.fsid 6bd5c974-2565-4736-815d-fe071f560e68 [match] > > dev_item.type 0 > > dev_item.total_bytes 375567417344 > > dev_item.bytes_used 248059527168 > > dev_item.io_align 4096 > > dev_item.io_width 4096 > > dev_item.sector_size 4096 > > dev_item.devid 1 > > dev_item.dev_group 0 > > dev_item.seek_speed 0 > > dev_item.bandwidth 0 > > dev_item.generation 0 > > sys_chunk_array[2048]: > > item 0 key (FIRST_CHUNK_TREE CHUNK_ITEM 22020096) > > length 8388608 owner 2 stripe_len 65536 type SYSTEM|DUP > > io_align 65536 io_width 65536 sector_size 4096 > > num_stripes 2 sub_stripes 0 > > stripe 0 devid 1 offset 22020096 > > dev_uuid d71e03b8-b353-4242-a65a-dc9d60bc46a6 > > stripe 1 devid 1 offset 30408704 > > dev_uuid d71e03b8-b353-4242-a65a-dc9d60bc46a6 > > backup_roots[4]: > > backup 0: > > backup_tree_root: 350814208 gen: 166 > > level: 1 > > backup_chunk_root: 22020096 gen: 156 > > level: 1 > > backup_extent_root: 340721664 gen: 166 > > level: 2 > > backup_fs_root: 338608128 gen: 166 > > level: 2 > > backup_dev_root: 354140160 gen: 166 > > level: 1 > > backup_csum_root: 353402880 gen: 166 > > level: 2 > > backup_total_bytes: 375567417344 > > backup_bytes_used: 243939692544 > > backup_num_devices: 1 > > > > backup 1: > > backup_tree_root: 57311232 gen: 167 > > level: 1 > > backup_chunk_root: 22020096 gen: 156 > > level: 1 > > backup_extent_root: 69419008 gen: 167 > > level: 2 > > backup_fs_root: 338608128 gen: 166 > > level: 2 > > backup_dev_root: 317472768 gen: 167 > > level: 1 > > backup_csum_root: 345784320 gen: 167 > > level: 2 > > backup_total_bytes: 375567417344 > > backup_bytes_used: 243939692544 > > backup_num_devices: 1 > > > > backup 2: > > backup_tree_root: 340721664 gen: 168 > > level: 1 > > backup_chunk_root: 22020096 gen: 156 > > level: 1 > > backup_extent_root: 340738048 gen: 168 > > level: 2 > > backup_fs_root: 338608128 gen: 166 > > level: 2 > > backup_dev_root: 345358336 gen: 168 > > level: 1 > > backup_csum_root: 353320960 gen: 168 > > level: 2 > > backup_total_bytes: 375567417344 > > backup_bytes_used: 243939692544 > > backup_num_devices: 1 > > > > backup 3: > > backup_tree_root: 57311232 gen: 165 > > level: 1 > > backup_chunk_root: 22020096 gen: 156 > > level: 1 > > backup_extent_root: 69419008 gen: 165 > > level: 2 > > backup_fs_root: 352387072 gen: 157 > > level: 2 > > backup_dev_root: 317325312 gen: 165 > > level: 1 > > backup_csum_root: 343932928 gen: 165 > > level: 2 > > backup_total_bytes: 375567417344 > > backup_bytes_used: 243939692544 > > backup_num_devices: 1 > > > > > > > > > > > > Mit freundlichen Grüßen/Kind regards > > > > > > Felix Koop > > > > > >> Qu Wenruo <quwenruo.bt...@gmx.com> hat am 22. September 2019 um 11:50 > >> geschrieben: > >> > >> > >> > >> > >> On 2019/9/22 下午2:34, Felix Koop wrote: > >>> Hello, > >>> > >>> I need help accessing a btrfs-filesystem. When I try to mount the fs, I > >>> get the following error: > >>> > >>> # mount -t btrfs /dev/md/1 /mnt > >>> mount: /mnt: wrong fs type, bad option, bad superblock on /dev/md1, > >>> missing codepage or helper program, or other error. > >> > >> dmesg please. > >> > >>> > >>> When I then try to check the fs, this is what I get: > >>> > >>> # btrfs check /dev/md/1 > >>> Opening filesystem to check... > >>> No valid Btrfs found on /dev/md/1 > >>> ERROR: cannot open file system > >> > >> As it said, it can't find the primary superblock. > >> > >> Please provide the following output. > >> > >> # btrfs ins dump-super -fFa /dev/md/1 > >> > >> And kernel and btrfs-progs version please. > >> > >> Thanks, > >> Qu > >>> > >>> Can anybody help me how to recover my data? > >>> > >>> > >> >
