Hello,

Is there any way to change the backing file path of qcow2 being used by a vm?
rebase failed due to a lock.

for example,

before
$ qemu-img info qcow2-file
...
backing file: json:{"backing": {"driver": "qcow2", "file":
{"throttle-group": "tg", "driver": "throttle", ...

after
$ qemu-img info qcow2-file
...
backing file: /path/to/backing/file

In many cases, qcow2-related commands such as virt-* fail to work due
to the complex backing file format shown above.

such a qcow2 file is generated when running the blockdev-snapshot-sync
qmp on a device that has a throttle filter between qcow2 and file
nodes.

or is it possible to explicitly specify the backing file path when
running blockdev-snapshot-sync?

Sincerely,

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