[Qemu-devel] Any tutorial to read/write in qcow2 format by programming way?

[lampahome]

As titled

I learn some info about qcow2 and tried to write some data and make it
qualified for qcow2 format.

I do it and mount through qemu-nbd successfully.

But I don't know how taking snapshot and backing file works in programming
way.

Can someone tell me some tutorial to know or code snippets to learn?

thx