$first_boot_dev /boot btrfs nofail,noatime,subvol=$boot_vol 0 0
$first_boot_dev /mnt/boot btrfs nofail,noatime,subvolid=0 0 0
EOF
$first_boot_dev /boot btrfs nofail,noatime,subvol=$boot_vol 0 0
$first_boot_dev /mnt/boot btrfs nofail,noatime,subvolid=0 0 0
EOF