On 2019/11/5 下午11:04, Sergiu Cozma wrote:
> hi, i need some help to recover a btrfs partition
> i use btrfs-progs v5.3.1
> 
> btrfs rescue super-recover https://pastebin.com/mGEp6vjV
> btrfs inspect-internal dump-super -a https://pastebin.com/S4WrPQm1
> btrfs inspect-internal dump-tree https://pastebin.com/yX1zUDxa
> 
> can't mount the partition with
> BTRFS error (device sdb4): bad tree block start, want 856119312384 have 0

Something wiped your fs on-disk data.
And the wiped one belongs to one of the most essential tree, chunk tree.

What's the history of the fs?
It doesn't look like a bug in btrfs, but some external thing wiped it.

Thanks,
Qu

> [ 2295.237145] BTRFS error (device sdb4): failed to read chunk root
> [ 2295.301067] BTRFS error (device sdb4): open_ctree failed
>