This folder contains Raspberry Pi OS (Raspi OS / Raspbian) full-disk image files, which are based on the official RaspiOS images
provided by the Raspberry Pi Foundation at: https://www.raspberrypi.org/downloads/raspberry-pi-os/

These images have been modified by Chris (Someguy123) @ Privex Inc. to have a Btrfs root filesystem, instead of the default ext4 filesystem.

To make Btrfs work properly, the kernel has been replaced with Privex's custom-built Raspberry Pi Linux Kernel, which is available
on it's own at: http://files.privex.io/builds/rasp-pi/kernels/5.4.68-v7l-custom/

The root Btrfs filesystem has been configured like so:

    BTRFS TREE ROOT (subvol id 5)
    ->
        ID 256 gen 33 top level 5 path rootfs
            ->  ID 257 gen 27 top level 256 path etc

        ID 258 gen 27 top level 5 path home
        ID 259 gen 31 top level 5 path log
        ID 260 gen 26 top level 5 path roothome

The subvolumes are mounted like such (fstab example):

    UUID=xxxx          /               btrfs       defaults,noatime,subvol=rootfs          0   0
    UUID=xxxx          /home           btrfs       defaults,noatime,subvol=home            0   0
    UUID=xxxx          /root           btrfs       defaults,noatime,subvol=roothome        0   0
    UUID=xxxx          /var/log        btrfs       defaults,noatime,subvol=log             0   0


To access the root btrfs tree from a running system:

    sudo su -

    mkdir /fsroot
    # Subvolume ID 5 is the Btrfs filesystem tree root, which contains the top tier subvolumes,
    # including the rootfs
    mount -o defaults,subvolid=5 /dev/mmcblk0p2 /fsroot

    ls /fsroot