Same for XFS and Btrfs, both of which should have fstab fs_passno set to 0, both of which have place holder fsck that don't actually do a file system check. The

Same for XFS and Btrfs, both of which should have fstab fs_passno set to 0, both of which have place holder fsck that don't actually do a file system check. The actual check is done from user space on an unmounted file system. Strictly speaking ext4 doesn't require it either, it's just highly recommended that there be a periodic e2fsck -f (i.e. check even if the journal is consistent and says the file system is clean), by default this is 180 days but the user can modify or disable this with tune2fs. It's possible to make it mount-count or time-dependent. See tune2fs -i.