Thank you so much for fixing that superblock! Wouldn't even know where to begin myself.
btrfs check returned Checking filesystem on /dev/mapper/x UUID: 513f07e1-08be-4d94-a55c-11c6251f6c2f checking extents checking free space cache checking fs roots checking csums checking root refs found 420849201152 bytes used, no error found total csum bytes: 405265360 total tree bytes: 583565312 total fs tree bytes: 56459264 total extent tree bytes: 56328192 btree space waste bytes: 74766514 file data blocks allocated: 440751226880 referenced 419705761792 So I believe everything else looks good. I've successfully mounted the file system and can access all my data. Thanks again, Ken On 03/06/2018 03:45 AM, Qu Wenruo wrote: > Here is the fixed superblock. > > csum type and incompat flags get fixed. > > I'm not sure if they are the only problems, but I strongly recommend to > run btrfs check before mount. > > Thanks, > Qu > > On 2018年03月06日 10:22, Ken Swenson wrote: >> Hi Qu, >> >> attached is the binary super block as requested. >> >> Thank you, >> >> Ken >> >> On 03/05/2018 09:07 PM, Qu Wenruo wrote: >>> On 2018年03月06日 09:51, Ken Swenson wrote: >>>> Hello, >>>> >>>> Somehow it appears the csum_type on my btrfs file system got corrupted. >>>> I cannot mount the system in recovery or read only. btrfs check just >>>> returns "ERROR: unsupported checksum algorithm 35355" as well as btrfs >>>> recover. The only command I was able to successfully run was btrfs >>>> inspect-internal dump-super, which I've pasted the output at the end of >>>> this message. >>>> >>>> Requested information from the wiki: >>>> Linux 4.15.7-1-ARCH #1 SMP PREEMPT Wed Feb 28 19:01:57 UTC 2018 x86_64 >>>> GNU/Linux >>>> btrfs-progs v4.15.1 >>>> btrfs fi show: ERROR: unsupported checksum algorithm 35355 ERROR: cannot >>>> scan /dev/mapper/x: Input/output error >>>> >>>> dmesg: >>>> [ 11.232399] Btrfs loaded, crc32c=crc32c-intel >>>> [ 11.233229] BTRFS: device fsid 513f07e1-08be-4d94-a55c-11c6251f6c2f >>>> devid 1 transid 7777 /dev/dm-2 >>>> [ 488.372891] BTRFS error (device dm-2): unsupported checksum algorithm >>>> 35355 >>>> [ 488.372894] BTRFS error (device dm-2): superblock checksum mismatch >>>> [ 488.384902] BTRFS error (device dm-2): open_ctree failed >>>> >>>> Is there anything I can do to recovery from this or am I out of luck? To >>>> give some background the disk was working fine until I upgraded to >>>> Kernel 4.15.7 and rebooted. >>>> >>>> superblock: bytenr=65536, device=/dev/mapper/x >>>> --------------------------------------------------------- >>>> csum_type 35355 (INVALID) >>> This is obviously corrupted. >>> >>> Btrfs only supports csum_type 0 (CRC32) yet. >>> >>> And the value seems to be some garbage. >>> >>>> csum_size 32 >>> So is the csum size. >>> >>>> csum >>>> 0xf0dbeddd00000000000000000000000000000000000000000000000000000000 [match] >>> Surprised to see the csum even matched. >>> >>>> bytenr 65536 >>>> flags 0x1 >>>> ( WRITTEN ) >>>> magic _BHRfS_M [match] >>>> fsid 513f07e1-08be-4d94-a55c-11c6251f6c2f >>>> label >>>> generation 7777 >>>> root 186466304 >>>> sys_array_size 129 >>>> chunk_root_generation 7450 >>>> root_level 1 >>>> chunk_root 21004288 >>>> chunk_root_level 1 >>>> log_root 0 >>>> log_root_transid 0 >>>> log_root_level 0 >>>> total_bytes 5000947523584 >>>> bytes_used 420849201152 >>>> sectorsize 4096 >>>> nodesize 16384 >>>> leafsize (deprecated) 16384 >>>> stripesize 4096 >>>> root_dir 6 >>>> num_devices 1 >>>> compat_flags 0x0 >>>> compat_ro_flags 0x0 >>>> incompat_flags 0x176d200000000169 >>>> ( MIXED_BACKREF | >>>> COMPRESS_LZO | >>>> BIG_METADATA | >>>> EXTENDED_IREF | >>>> SKINNY_METADATA | >>>> unknown flag: 0x176d200000000000 ) >>> And unknown flags also exists. >>> >>> And according to later output, all backup super blocks have the same >>> corruption while csum still matches. >>> >>> I'm wondering if the memory is corrupted. >>> >>> It's possible to manually modify the superblock to a valid status. >>> As all the corruption is obvious, but I'm not 100% sure if there is >>> other corruption. >>> >>> Please provide the binary superblock dump by: >>> >>> dd if=<device> bs=1 count=4K skip=64K of=super_copy >>> >>> Thanks, >>> Qu >>> >>>> cache_generation 7777 >>>> uuid_tree_generation 7777 >>>> dev_item.uuid 880c692f-5270-4c7a-908d-8b3956fb3790 >>>> dev_item.fsid 513f07e1-08be-4d94-a55c-11c6251f6c2f [match] >>>> dev_item.type 0 >>>> dev_item.total_bytes 5000947523584 >>>> dev_item.bytes_used 457439182848 >>>> 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 20971520) >>>> 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 20971520 >>>> dev_uuid 880c692f-5270-4c7a-908d-8b3956fb3790 >>>> stripe 1 devid 1 offset 29360128 >>>> dev_uuid 880c692f-5270-4c7a-908d-8b3956fb3790 >>>> backup_roots[4]: >>>> backup 0: >>>> backup_tree_root: 181174272 gen: 7774 level: 1 >>>> backup_chunk_root: 21004288 gen: 7450 level: 1 >>>> backup_extent_root: 181190656 gen: 7774 level: 2 >>>> backup_fs_root: 809828352 gen: 6404 level: 0 >>>> backup_dev_root: 93585408 gen: 7631 level: 1 >>>> backup_csum_root: 181862400 gen: 7774 level: 2 >>>> backup_total_bytes: 5000947523584 >>>> backup_bytes_used: 420849201152 >>>> backup_num_devices: 1 >>>> >>>> backup 1: >>>> backup_tree_root: 183828480 gen: 7775 level: 1 >>>> backup_chunk_root: 21004288 gen: 7450 level: 1 >>>> backup_extent_root: 183320576 gen: 7775 level: 2 >>>> backup_fs_root: 809828352 gen: 6404 level: 0 >>>> backup_dev_root: 183975936 gen: 7775 level: 1 >>>> backup_csum_root: 185761792 gen: 7775 level: 2 >>>> backup_total_bytes: 5000947523584 >>>> backup_bytes_used: 420849201152 >>>> backup_num_devices: 1 >>>> >>>> backup 2: >>>> backup_tree_root: 186810368 gen: 7776 level: 1 >>>> backup_chunk_root: 21004288 gen: 7450 level: 1 >>>> backup_extent_root: 186613760 gen: 7776 level: 2 >>>> backup_fs_root: 809828352 gen: 6404 level: 0 >>>> backup_dev_root: 183975936 gen: 7775 level: 1 >>>> backup_csum_root: 187056128 gen: 7776 level: 2 >>>> backup_total_bytes: 5000947523584 >>>> backup_bytes_used: 420849201152 >>>> backup_num_devices: 1 >>>> >>>> backup 3: >>>> backup_tree_root: 186466304 gen: 7777 level: 1 >>>> backup_chunk_root: 21004288 gen: 7450 level: 1 >>>> backup_extent_root: 187908096 gen: 7777 level: 2 >>>> backup_fs_root: 809828352 gen: 6404 level: 0 >>>> backup_dev_root: 183975936 gen: 7775 level: 1 >>>> backup_csum_root: 188071936 gen: 7777 level: 2 >>>> backup_total_bytes: 5000947523584 >>>> backup_bytes_used: 420849201152 >>>> backup_num_devices: 1 >>>> >>>>
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