fsck.btrfs - do nothing, successfully

fsck.btrfs  is  a  type of utility that should exist for any filesystem and is called during system setup
       when the corresponding /etc/fstab entries contain non-zero value for fs_passno, see 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 filesystem consistency is checked, the repair mode is enabled via the --repair
       option (use with care!).

       There are two possible exit codes returned:

       0      No error

       8      Operational error, e.g. device does not exist

/etc/fstab

       fsck.btrfs - do nothing, successfully

       The options are all the same and detect if fsck.btrfs is executed in non-interactive mode and exits  with
       success, otherwise prints a message about btrfs check.

btrfs(8), fsck(8), fstab(5)

6.12                                              Jan 03, 2025                                     FSCK.BTRFS(8)

fsck.btrfs [-aApy] [<device>...]