fstab(5) for more.Traditional filesystems need to run their respective fsck utility in case the filesystem was not unmounted cleanly and the log needs to be replayed before mount. This is not needed for BTRFS. You should set fs_passno to 0.If you wish to check the consistency of a BTRFS filesystem or repair a damaged filesystem, see btrfs-check(8). By default the filesystem consistency is checked, the repair mode is enabled via --repair option (use with care!).
Operational error, eg. device does not existbtrfs(8), fsck(8), fstab(5),