Loop given a handle to a Loopback device (such as /dev/loop0), and a handle to the image to loop mount (such as a squashfs or ext4fs image), performs the required call to loop the image to the provided block device.

LoopSetReadWrite clears the read-only flag on the loop devices.

NextLoopDevice gets the next loopback device that isn't used.

Unloop given a handle to the Loopback device (such as /dev/loop0), preforms the required call to the image to unloop the file.