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block: Accept node-name for blockdev-snapshot-internal-sync
In order to remove the necessity to use BlockBackend names in the external API, we want to allow node-names everywhere. This converts blockdev-snapshot-internal-sync to accept a node-name without lifting the restriction that we're operating at a root node. In case of an invalid device name, the command returns the GenericError error class now instead of DeviceNotFound, because this is what qmp_get_root_bs() returns. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Alberto Garcia <berto@igalia.com> Reviewed-by: Max Reitz <mreitz@redhat.com>
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