btrfs-select-super(8) overwrite superblock with a backup


btrfs-select-super -s number dev


btrfs-select-super destructively overwrites all copies of the superblock with a specified copy. This helps with certain cases of damage, especially when barriers were disabled during a power failure. You can find a valid copy of the superblock with btrfs check -s.

The filesystem specified by dev must not be mounted.


-s|--super <superblock>

use <superblock>th superblock copy, valid values are 0 up to 2 if the respective superblock offset is within the filesystem