Try to recover a damaged btrfs filesystem. More information: https://btrfs.readthedocs.io/en/latest/btrfs-rescue.html.
sudo btrfs rescue chunk-recover {{path/to/partition}}
sudo btrfs rescue fix-device-size {{path/to/partition}}
sudo btrfs rescue super-recover {{path/to/partition}}
sudo btrfs rescue zero-log {{path/to/partition}}
/dev/btrfs-control
control device when mknod
is not installed:sudo btrfs rescue create-control-device