QMP> { "execute": "query-named-block-nodes" }
{  
  "return":[  
    {  
      "iops_rd":0,
      "detect_zeroes":"off",
      "image":{  
        "virtual-size":41126400,
        "filename":"/export/base.qcow2",
        "cluster-size":65536,
        "format":"qcow2",
        "actual-size":19886080,
        "format-specific":{  
          "type":"qcow2",
          "data":{  
            "compat":"0.10",
            "refcount-bits":16
          }
        },
        "dirty-flag":false
      },
      "iops_wr":0,
      "ro":true,
      "node-name":"#block453",
      "backing_file_depth":0,
      "drv":"qcow2",
      "iops":0,
      "bps_wr":0,
      "write_threshold":0,
      "encrypted":false,
      "bps":0,
      "bps_rd":0,
      "cache":{  
        "no-flush":false,
        "direct":false,
        "writeback":true
      },
      "file":"/export/base.qcow2",
      "encryption_key_missing":false
    },
    {  
      "iops_rd":0,
      "detect_zeroes":"off",
      "image":{  
        "virtual-size":19922944,
        "filename":"/export/base.qcow2",
        "format":"file",
        "actual-size":19886080,
        "dirty-flag":false
      },
      "iops_wr":0,
      "ro":true,
      "node-name":"#block317",
      "backing_file_depth":0,
      "drv":"file",
      "iops":0,
      "bps_wr":0,
      "write_threshold":0,
      "encrypted":false,
      "bps":0,
      "bps_rd":0,
      "cache":{  
        "no-flush":false,
        "direct":false,
        "writeback":true
      },
      "file":"/export/base.qcow2",
      "encryption_key_missing":false
    },
    {  
      "iops_rd":0,
      "detect_zeroes":"off",
      "image":{  
        "backing-image":{  
          "virtual-size":41126400,
          "filename":"/export/base.qcow2",
          "cluster-size":65536,
          "format":"qcow2",
          "actual-size":19886080,
          "format-specific":{  
            "type":"qcow2",
            "data":{  
              "compat":"0.10",
              "refcount-bits":16
            }
          },
          "dirty-flag":false
        },
        "backing-filename-format":"qcow2",
        "virtual-size":1073741824,
        "filename":"/export/target.qcow2",
        "cluster-size":65536,
        "format":"qcow2",
        "actual-size":200704,
        "format-specific":{  
          "type":"qcow2",
          "data":{  
            "compat":"1.1",
            "lazy-refcounts":false,
            "refcount-bits":16,
            "corrupt":false
          }
        },
        "full-backing-filename":"/export/base.qcow2",
        "backing-filename":"/export/base.qcow2",
        "dirty-flag":false
      },
      "iops_wr":0,
      "ro":false,
      "node-name":"node1",
      "backing_file_depth":1,
      "drv":"qcow2",
      "iops":0,
      "bps_wr":0,
      "write_threshold":0,
      "backing_file":"/export/base.qcow2",
      "encrypted":false,
      "bps":0,
      "bps_rd":0,
      "cache":{  
        "no-flush":false,
        "direct":false,
        "writeback":true
      },
      "file":"/export/target.qcow2",
      "encryption_key_missing":false
    },
    {  
      "iops_rd":0,
      "detect_zeroes":"off",
      "image":{  
        "virtual-size":197120,
        "filename":"/export/target.qcow2",
        "format":"file",
        "actual-size":200704,
        "dirty-flag":false
      },
      "iops_wr":0,
      "ro":false,
      "node-name":"#block271",
      "backing_file_depth":0,
      "drv":"file",
      "iops":0,
      "bps_wr":0,
      "write_threshold":0,
      "encrypted":false,
      "bps":0,
      "bps_rd":0,
      "cache":{  
        "no-flush":false,
        "direct":false,
        "writeback":true
      },
      "file":"/export/target.qcow2",
      "encryption_key_missing":false
    },
    {  
      "iops_rd":0,
      "detect_zeroes":"off",
      "image":{  
        "virtual-size":41126400,
        "filename":"./base.qcow2",
        "cluster-size":65536,
        "format":"qcow2",
        "actual-size":19886080,
        "format-specific":{  
          "type":"qcow2",
          "data":{  
            "compat":"0.10",
            "refcount-bits":16
          }
        },
        "dirty-flag":false
      },
      "iops_wr":0,
      "ro":false,
      "node-name":"#block197",
      "backing_file_depth":0,
      "drv":"qcow2",
      "iops":0,
      "bps_wr":0,
      "write_threshold":0,
      "encrypted":false,
      "bps":0,
      "bps_rd":0,
      "cache":{  
        "no-flush":false,
        "direct":false,
        "writeback":true
      },
      "file":"./base.qcow2",
      "encryption_key_missing":false
    },
    {  
      "iops_rd":0,
      "detect_zeroes":"off",
      "image":{  
        "virtual-size":19922944,
        "filename":"./base.qcow2",
        "format":"file",
        "actual-size":19886080,
        "dirty-flag":false
      },
      "iops_wr":0,
      "ro":false,
      "node-name":"#block074",
      "backing_file_depth":0,
      "drv":"file",
      "iops":0,
      "bps_wr":0,
      "write_threshold":0,
      "encrypted":false,
      "bps":0,
      "bps_rd":0,
      "cache":{  
        "no-flush":false,
        "direct":false,
        "writeback":true
      },
      "file":"./base.qcow2",
      "encryption_key_missing":false
    }
  ]
}