btrfsck(8) on Linux
The text 71f86e377a7e, as Debian 9 (Stretch) shipped it.
check or repair an unmounted btrfs filesystem
Flags it lists
-
--check-data-csum -
--chunk-root -
--init-csum-tree -
--init-extent-tree -
--mode -
--qgroup-report -
--readonly -
--repair