arch btrfs create file system

mkfs.vfat -F32 -n "EFI" /dev/sda1
cryptsetup luksOpen /dev/sda2 root
mkfs.btrfs -f -L "arch_crypt" /dev/mapper/root
mkdir -p /mnt/btrfs-root
mount /dev/mapper/root /mnt/btrfs-root
mkdir -p /mnt/btrfs-root/__active
mkdir -p /mnt/btrfs-root/__snapshot
cd /mnt/btrfs-root
btrfs subvolume create __active/rootvol
btrfs subvolume create __active/home
btrfs subvolume create __active/var
btrfs subvolume create __active/opt
mkdir -p /mnt/btrfs-active
mount -o nodev,relatime,subvol=__active/rootvol /dev/mapper/root /mnt/btrfs-active
mkdir -p /mnt/btrfs-active/{home,opt,var,var/lib,boot}
mount -o defaults,nosuid,nodev,relatime,subvol=__active/home /dev/mapper/root /mnt/btrfs-active/home
mount -o defaults,nosuid,nodev,relatime,subvol=__active/opt /dev/mapper/root /mnt/btrfs-active/opt
mount -o defaults,nosuid,nodev,noexec,relatime,subvol=__active/var /dev/mapper/root /mnt/btrfs-active/var
mkdir -p /mnt/btrfs-active/var/lib
mount --bind /mnt/btrfs-root/__active/rootvol/var/lib /mnt/btrfs-active/var/lib
mount -o defaults,nosuid,nodev,relatime,fmask=0022,dmask=0022,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro dev/sda1 /mnt/btrfs-active/boot