[Qemu-devel] Can the backing file of qcow2 points to a snapshot of base file?

[vt]

 

Hi.

 

If a base qcow2 image snapshot chain like this:

 

base.qcow2: [A] -> [B] -> [C]

 

[C] is the current image where guest read/write to,usually we create a new image base on the base.qcow2 like this

 

qemu-img create -f qcow2 -o backing_file=/path/base.qcow2 new.qcow2

 

so the data of new.qcow2 is from [C] of base.qcow2, assuming the new.qcow2 has not been write to since created.

 

What I want is that the data of new.qcow2 is from [B] of base.qcow2, like this:

 

qemu-img create -f qcow2 -o backing_file=/path/base.qcow2,backing_snapshot=B  new.qcow2

 

Can the qemu support it now?

 

Thanks

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vt