qemu: block: Don't nest storage layer properties into format layer

Reference the storage via node name rather than inlining it. This is the approach that will be used with -blockdev/blockdev-add since it allows more control and is more future proof. Signed-off-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: John Ferlan <jferlan@redhat.com>
2024-10-05 05:45:46 +00:00 · 2018-05-14 13:54:12 +02:00 · 2018-05-14 13:54:12 +02:00 · b8240fe704
commit b8240fe704
parent cf9683cac0
32 changed files with 835 additions and 760 deletions
--- a/src/qemu/qemu_block.c
+++ b/src/qemu/qemu_block.c
@ -1432,7 +1432,6 @@ virJSONValuePtr
 qemuBlockStorageSourceGetBlockdevProps(virStorageSourcePtr src)
 {
    bool backingSupported = src->format >= VIR_STORAGE_FILE_BACKING;
-    virJSONValuePtr storage = NULL;
    virJSONValuePtr props = NULL;
    virJSONValuePtr ret = NULL;

@ -1446,13 +1445,9 @@ qemuBlockStorageSourceGetBlockdevProps(virStorageSourcePtr src)
    if (!(props = qemuBlockStorageSourceGetBlockdevFormatProps(src)))
        goto cleanup;

-    if (!(storage = qemuBlockStorageSourceGetBackendProps(src, false)))
+    if (virJSONValueObjectAppendString(props, "file", src->nodestorage) < 0)
        goto cleanup;

-    if (virJSONValueObjectAppend(props, "file", storage) < 0)
-        goto cleanup;
-    storage = NULL;
-
    if (src->backingStore && backingSupported) {
        if (virStorageSourceHasBacking(src)) {
            if (virJSONValueObjectAppendString(props, "backing",
@ -1469,7 +1464,6 @@ qemuBlockStorageSourceGetBlockdevProps(virStorageSourcePtr src)
    VIR_STEAL_PTR(ret, props);

 cleanup:
-    virJSONValueFree(storage);
    virJSONValueFree(props);
    return ret;
 }
--- a/tests/qemublocktest.c
+++ b/tests/qemublocktest.c
@ -191,7 +191,8 @@ testQemuDiskXMLToProps(const void *opaque)
    struct testQemuDiskXMLToJSONData *data = (void *) opaque;
    virDomainDiskDefPtr disk = NULL;
    virStorageSourcePtr n;
-    virJSONValuePtr props = NULL;
+    virJSONValuePtr formatProps = NULL;
+    virJSONValuePtr storageProps = NULL;
    char *xmlpath = NULL;
    char *xmlstr = NULL;
    int ret = -1;
@ -221,7 +222,8 @@ testQemuDiskXMLToProps(const void *opaque)
        if (testQemuDiskXMLToJSONFakeSecrets(n) < 0)
            goto cleanup;

-        if (!(props = qemuBlockStorageSourceGetBlockdevProps(n))) {
+        if (!(formatProps = qemuBlockStorageSourceGetBlockdevProps(n)) ||
+            !(storageProps = qemuBlockStorageSourceGetBackendProps(n, false))) {
            if (!data->fail) {
                VIR_TEST_VERBOSE("failed to generate qemu blockdev props\n");
                goto cleanup;
@ -231,13 +233,16 @@ testQemuDiskXMLToProps(const void *opaque)
            goto cleanup;
        }

-        if (VIR_APPEND_ELEMENT(data->props, data->nprops, props) < 0)
+        if (VIR_APPEND_ELEMENT(data->props, data->nprops, formatProps) < 0 ||
+            VIR_APPEND_ELEMENT(data->props, data->nprops, storageProps) < 0)
            goto cleanup;
    }

    ret = 0;

 cleanup:
+    virJSONValueFree(formatProps);
+    virJSONValueFree(storageProps);
    virDomainDiskDefFree(disk);
    VIR_FREE(xmlpath);
    VIR_FREE(xmlstr);
--- a/tests/qemublocktestdata/xml2json/block-raw-noopts.json
+++ b/tests/qemublocktestdata/xml2json/block-raw-noopts.json
@ -2,11 +2,12 @@
  "node-name": "0123456789ABCDEF0123456789ABCDE",
  "read-only": false,
  "driver": "raw",
-  "file": {
-    "driver": "host_device",
-    "filename": "/dev/blah",
-    "node-name": "0123456789ABCDEF0123456789ABCDE",
-    "read-only": false,
-    "discard": "unmap"
-  }
+  "file": "0123456789ABCDEF0123456789ABCDE"
+}
+{
+  "driver": "host_device",
+  "filename": "/dev/blah",
+  "node-name": "0123456789ABCDEF0123456789ABCDE",
+  "read-only": false,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/dir-fat-cache.json
+++ b/tests/qemublocktestdata/xml2json/dir-fat-cache.json
@ -6,17 +6,18 @@
    "no-flush": false
  },
  "driver": "raw",
-  "file": {
-    "driver": "vvfat",
-    "dir": "/var/somefiles",
-    "floppy": false,
-    "rw": false,
-    "node-name": "node-s",
-    "cache": {
-      "direct": true,
-      "no-flush": false
-    },
-    "read-only": true,
-    "discard": "unmap"
-  }
+  "file": "node-s"
+}
+{
+  "driver": "vvfat",
+  "dir": "/var/somefiles",
+  "floppy": false,
+  "rw": false,
+  "node-name": "node-s",
+  "cache": {
+    "direct": true,
+    "no-flush": false
+  },
+  "read-only": true,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/dir-fat-floppy.json
+++ b/tests/qemublocktestdata/xml2json/dir-fat-floppy.json
@ -2,13 +2,14 @@
  "node-name": "node-f",
  "read-only": true,
  "driver": "raw",
-  "file": {
-    "driver": "vvfat",
-    "dir": "/var/somefiles",
-    "floppy": true,
-    "rw": false,
-    "node-name": "node-s",
-    "read-only": true,
-    "discard": "unmap"
-  }
+  "file": "node-s"
+}
+{
+  "driver": "vvfat",
+  "dir": "/var/somefiles",
+  "floppy": true,
+  "rw": false,
+  "node-name": "node-s",
+  "read-only": true,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/dir-fat-readonly.json
+++ b/tests/qemublocktestdata/xml2json/dir-fat-readonly.json
@ -2,13 +2,14 @@
  "node-name": "node-f",
  "read-only": true,
  "driver": "raw",
-  "file": {
-    "driver": "vvfat",
-    "dir": "/var/somefiles",
-    "floppy": false,
-    "rw": false,
-    "node-name": "node-s",
-    "read-only": true,
-    "discard": "unmap"
-  }
+  "file": "node-s"
+}
+{
+  "driver": "vvfat",
+  "dir": "/var/somefiles",
+  "floppy": false,
+  "rw": false,
+  "node-name": "node-s",
+  "read-only": true,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-backing_basic-aio_threads.json
+++ b/tests/qemublocktestdata/xml2json/file-backing_basic-aio_threads.json
@ -2,61 +2,65 @@
  "node-name": "node-a-f",
  "read-only": false,
  "driver": "qcow",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/a",
-    "aio": "threads",
-    "node-name": "node-a-s",
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "node-a-s",
  "backing": "node-b-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/a",
+  "aio": "threads",
+  "node-name": "node-a-s",
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "node-b-f",
  "read-only": true,
  "driver": "qed",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/b",
-    "aio": "threads",
-    "node-name": "node-b-s",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-b-s",
  "backing": "node-c-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/b",
+  "aio": "threads",
+  "node-name": "node-b-s",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-c-f",
  "read-only": true,
  "driver": "vmdk",
-  "file": {
-    "driver": "gluster",
-    "volume": "images",
-    "path": "c",
-    "server": [
-      {
-        "type": "inet",
-        "host": "test.org",
-        "port": "24007"
-      }
-    ],
-    "node-name": "node-c-s",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-c-s",
  "backing": "node-d-f"
 }
+{
+  "driver": "gluster",
+  "volume": "images",
+  "path": "c",
+  "server": [
+    {
+      "type": "inet",
+      "host": "test.org",
+      "port": "24007"
+    }
+  ],
+  "node-name": "node-c-s",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-d-f",
  "read-only": true,
  "driver": "raw",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/d",
-    "aio": "threads",
-    "node-name": "node-d-s",
-    "read-only": true,
-    "discard": "unmap"
-  }
+  "file": "node-d-s"
+}
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/d",
+  "aio": "threads",
+  "node-name": "node-d-s",
+  "read-only": true,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-backing_basic-cache-directsync.json
+++ b/tests/qemublocktestdata/xml2json/file-backing_basic-cache-directsync.json
@ -6,19 +6,20 @@
    "no-flush": false
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/a",
-    "node-name": "node-a-s",
-    "cache": {
-      "direct": true,
-      "no-flush": false
-    },
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "node-a-s",
  "backing": "node-b-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/a",
+  "node-name": "node-a-s",
+  "cache": {
+    "direct": true,
+    "no-flush": false
+  },
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "node-b-f",
  "read-only": true,
@ -27,19 +28,20 @@
    "no-flush": false
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/b",
-    "node-name": "node-b-s",
-    "cache": {
-      "direct": true,
-      "no-flush": false
-    },
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-b-s",
  "backing": "node-c-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/b",
+  "node-name": "node-b-s",
+  "cache": {
+    "direct": true,
+    "no-flush": false
+  },
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-c-f",
  "read-only": true,
@ -48,27 +50,28 @@
    "no-flush": false
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "gluster",
-    "volume": "images",
-    "path": "c",
-    "server": [
-      {
-        "type": "inet",
-        "host": "test.org",
-        "port": "24007"
-      }
-    ],
-    "node-name": "node-c-s",
-    "cache": {
-      "direct": true,
-      "no-flush": false
-    },
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-c-s",
  "backing": "node-d-f"
 }
+{
+  "driver": "gluster",
+  "volume": "images",
+  "path": "c",
+  "server": [
+    {
+      "type": "inet",
+      "host": "test.org",
+      "port": "24007"
+    }
+  ],
+  "node-name": "node-c-s",
+  "cache": {
+    "direct": true,
+    "no-flush": false
+  },
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-d-f",
  "read-only": true,
@ -77,15 +80,16 @@
    "no-flush": false
  },
  "driver": "raw",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/d",
-    "node-name": "node-d-s",
-    "cache": {
-      "direct": true,
-      "no-flush": false
-    },
-    "read-only": true,
-    "discard": "unmap"
-  }
+  "file": "node-d-s"
+}
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/d",
+  "node-name": "node-d-s",
+  "cache": {
+    "direct": true,
+    "no-flush": false
+  },
+  "read-only": true,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-backing_basic-cache-none.json
+++ b/tests/qemublocktestdata/xml2json/file-backing_basic-cache-none.json
@ -6,19 +6,20 @@
    "no-flush": false
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/a",
-    "node-name": "node-a-s",
-    "cache": {
-      "direct": true,
-      "no-flush": false
-    },
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "node-a-s",
  "backing": "node-b-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/a",
+  "node-name": "node-a-s",
+  "cache": {
+    "direct": true,
+    "no-flush": false
+  },
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "node-b-f",
  "read-only": true,
@ -27,19 +28,20 @@
    "no-flush": false
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/b",
-    "node-name": "node-b-s",
-    "cache": {
-      "direct": true,
-      "no-flush": false
-    },
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-b-s",
  "backing": "node-c-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/b",
+  "node-name": "node-b-s",
+  "cache": {
+    "direct": true,
+    "no-flush": false
+  },
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-c-f",
  "read-only": true,
@ -48,27 +50,28 @@
    "no-flush": false
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "gluster",
-    "volume": "images",
-    "path": "c",
-    "server": [
-      {
-        "type": "inet",
-        "host": "test.org",
-        "port": "24007"
-      }
-    ],
-    "node-name": "node-c-s",
-    "cache": {
-      "direct": true,
-      "no-flush": false
-    },
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-c-s",
  "backing": "node-d-f"
 }
+{
+  "driver": "gluster",
+  "volume": "images",
+  "path": "c",
+  "server": [
+    {
+      "type": "inet",
+      "host": "test.org",
+      "port": "24007"
+    }
+  ],
+  "node-name": "node-c-s",
+  "cache": {
+    "direct": true,
+    "no-flush": false
+  },
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-d-f",
  "read-only": true,
@ -77,15 +80,16 @@
    "no-flush": false
  },
  "driver": "raw",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/d",
-    "node-name": "node-d-s",
-    "cache": {
-      "direct": true,
-      "no-flush": false
-    },
-    "read-only": true,
-    "discard": "unmap"
-  }
+  "file": "node-d-s"
+}
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/d",
+  "node-name": "node-d-s",
+  "cache": {
+    "direct": true,
+    "no-flush": false
+  },
+  "read-only": true,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-backing_basic-cache-unsafe.json
+++ b/tests/qemublocktestdata/xml2json/file-backing_basic-cache-unsafe.json
@ -6,19 +6,20 @@
    "no-flush": true
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/a",
-    "node-name": "node-a-s",
-    "cache": {
-      "direct": false,
-      "no-flush": true
-    },
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "node-a-s",
  "backing": "node-b-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/a",
+  "node-name": "node-a-s",
+  "cache": {
+    "direct": false,
+    "no-flush": true
+  },
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "node-b-f",
  "read-only": true,
@ -27,19 +28,20 @@
    "no-flush": true
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/b",
-    "node-name": "node-b-s",
-    "cache": {
-      "direct": false,
-      "no-flush": true
-    },
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-b-s",
  "backing": "node-c-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/b",
+  "node-name": "node-b-s",
+  "cache": {
+    "direct": false,
+    "no-flush": true
+  },
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-c-f",
  "read-only": true,
@ -48,27 +50,28 @@
    "no-flush": true
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "gluster",
-    "volume": "images",
-    "path": "c",
-    "server": [
-      {
-        "type": "inet",
-        "host": "test.org",
-        "port": "24007"
-      }
-    ],
-    "node-name": "node-c-s",
-    "cache": {
-      "direct": false,
-      "no-flush": true
-    },
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-c-s",
  "backing": "node-d-f"
 }
+{
+  "driver": "gluster",
+  "volume": "images",
+  "path": "c",
+  "server": [
+    {
+      "type": "inet",
+      "host": "test.org",
+      "port": "24007"
+    }
+  ],
+  "node-name": "node-c-s",
+  "cache": {
+    "direct": false,
+    "no-flush": true
+  },
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-d-f",
  "read-only": true,
@ -77,15 +80,16 @@
    "no-flush": true
  },
  "driver": "raw",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/d",
-    "node-name": "node-d-s",
-    "cache": {
-      "direct": false,
-      "no-flush": true
-    },
-    "read-only": true,
-    "discard": "unmap"
-  }
+  "file": "node-d-s"
+}
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/d",
+  "node-name": "node-d-s",
+  "cache": {
+    "direct": false,
+    "no-flush": true
+  },
+  "read-only": true,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-backing_basic-cache-writeback.json
+++ b/tests/qemublocktestdata/xml2json/file-backing_basic-cache-writeback.json
@ -6,19 +6,20 @@
    "no-flush": false
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/a",
-    "node-name": "node-a-s",
-    "cache": {
-      "direct": false,
-      "no-flush": false
-    },
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "node-a-s",
  "backing": "node-b-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/a",
+  "node-name": "node-a-s",
+  "cache": {
+    "direct": false,
+    "no-flush": false
+  },
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "node-b-f",
  "read-only": true,
@ -27,19 +28,20 @@
    "no-flush": false
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/b",
-    "node-name": "node-b-s",
-    "cache": {
-      "direct": false,
-      "no-flush": false
-    },
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-b-s",
  "backing": "node-c-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/b",
+  "node-name": "node-b-s",
+  "cache": {
+    "direct": false,
+    "no-flush": false
+  },
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-c-f",
  "read-only": true,
@ -48,27 +50,28 @@
    "no-flush": false
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "gluster",
-    "volume": "images",
-    "path": "c",
-    "server": [
-      {
-        "type": "inet",
-        "host": "test.org",
-        "port": "24007"
-      }
-    ],
-    "node-name": "node-c-s",
-    "cache": {
-      "direct": false,
-      "no-flush": false
-    },
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-c-s",
  "backing": "node-d-f"
 }
+{
+  "driver": "gluster",
+  "volume": "images",
+  "path": "c",
+  "server": [
+    {
+      "type": "inet",
+      "host": "test.org",
+      "port": "24007"
+    }
+  ],
+  "node-name": "node-c-s",
+  "cache": {
+    "direct": false,
+    "no-flush": false
+  },
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-d-f",
  "read-only": true,
@ -77,15 +80,16 @@
    "no-flush": false
  },
  "driver": "raw",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/d",
-    "node-name": "node-d-s",
-    "cache": {
-      "direct": false,
-      "no-flush": false
-    },
-    "read-only": true,
-    "discard": "unmap"
-  }
+  "file": "node-d-s"
+}
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/d",
+  "node-name": "node-d-s",
+  "cache": {
+    "direct": false,
+    "no-flush": false
+  },
+  "read-only": true,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-backing_basic-cache-writethrough.json
+++ b/tests/qemublocktestdata/xml2json/file-backing_basic-cache-writethrough.json
@ -6,19 +6,20 @@
    "no-flush": false
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/a",
-    "node-name": "node-a-s",
-    "cache": {
-      "direct": false,
-      "no-flush": false
-    },
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "node-a-s",
  "backing": "node-b-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/a",
+  "node-name": "node-a-s",
+  "cache": {
+    "direct": false,
+    "no-flush": false
+  },
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "node-b-f",
  "read-only": true,
@ -27,19 +28,20 @@
    "no-flush": false
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/b",
-    "node-name": "node-b-s",
-    "cache": {
-      "direct": false,
-      "no-flush": false
-    },
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-b-s",
  "backing": "node-c-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/b",
+  "node-name": "node-b-s",
+  "cache": {
+    "direct": false,
+    "no-flush": false
+  },
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-c-f",
  "read-only": true,
@ -48,27 +50,28 @@
    "no-flush": false
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "gluster",
-    "volume": "images",
-    "path": "c",
-    "server": [
-      {
-        "type": "inet",
-        "host": "test.org",
-        "port": "24007"
-      }
-    ],
-    "node-name": "node-c-s",
-    "cache": {
-      "direct": false,
-      "no-flush": false
-    },
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-c-s",
  "backing": "node-d-f"
 }
+{
+  "driver": "gluster",
+  "volume": "images",
+  "path": "c",
+  "server": [
+    {
+      "type": "inet",
+      "host": "test.org",
+      "port": "24007"
+    }
+  ],
+  "node-name": "node-c-s",
+  "cache": {
+    "direct": false,
+    "no-flush": false
+  },
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-d-f",
  "read-only": true,
@ -77,15 +80,16 @@
    "no-flush": false
  },
  "driver": "raw",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/d",
-    "node-name": "node-d-s",
-    "cache": {
-      "direct": false,
-      "no-flush": false
-    },
-    "read-only": true,
-    "discard": "unmap"
-  }
+  "file": "node-d-s"
+}
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/d",
+  "node-name": "node-d-s",
+  "cache": {
+    "direct": false,
+    "no-flush": false
+  },
+  "read-only": true,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-backing_basic-detect.json
+++ b/tests/qemublocktestdata/xml2json/file-backing_basic-detect.json
@ -3,58 +3,62 @@
  "read-only": false,
  "detect-zeroes": "on",
  "driver": "qcow",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/a",
-    "node-name": "node-a-s",
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "node-a-s",
  "backing": "node-b-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/a",
+  "node-name": "node-a-s",
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "node-b-f",
  "read-only": true,
  "driver": "qed",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/b",
-    "node-name": "node-b-s",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-b-s",
  "backing": "node-c-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/b",
+  "node-name": "node-b-s",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-c-f",
  "read-only": true,
  "driver": "vmdk",
-  "file": {
-    "driver": "gluster",
-    "volume": "images",
-    "path": "c",
-    "server": [
-      {
-        "type": "inet",
-        "host": "test.org",
-        "port": "24007"
-      }
-    ],
-    "node-name": "node-c-s",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-c-s",
  "backing": "node-d-f"
 }
+{
+  "driver": "gluster",
+  "volume": "images",
+  "path": "c",
+  "server": [
+    {
+      "type": "inet",
+      "host": "test.org",
+      "port": "24007"
+    }
+  ],
+  "node-name": "node-c-s",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-d-f",
  "read-only": true,
  "driver": "raw",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/d",
-    "node-name": "node-d-s",
-    "read-only": true,
-    "discard": "unmap"
-  }
+  "file": "node-d-s"
+}
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/d",
+  "node-name": "node-d-s",
+  "read-only": true,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-backing_basic-noopts.json
+++ b/tests/qemublocktestdata/xml2json/file-backing_basic-noopts.json
@ -2,50 +2,54 @@
  "node-name": "node-a-f",
  "read-only": false,
  "driver": "qed",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/a",
-    "node-name": "node-a-s",
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "node-a-s",
  "backing": "node-b-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/a",
+  "node-name": "node-a-s",
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "node-b-f",
  "read-only": true,
  "driver": "qcow",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/b",
-    "node-name": "node-b-s",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-b-s",
  "backing": "node-c-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/b",
+  "node-name": "node-b-s",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-c-f",
  "read-only": true,
  "driver": "vmdk",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/c",
-    "node-name": "node-c-s",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-c-s",
  "backing": "node-d-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/c",
+  "node-name": "node-c-s",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-d-f",
  "read-only": true,
  "driver": "raw",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/d",
-    "node-name": "node-d-s",
-    "read-only": true,
-    "discard": "unmap"
-  }
+  "file": "node-d-s"
+}
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/d",
+  "node-name": "node-d-s",
+  "read-only": true,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-backing_basic-unmap-detect.json
+++ b/tests/qemublocktestdata/xml2json/file-backing_basic-unmap-detect.json
@ -4,61 +4,65 @@
  "discard": "unmap",
  "detect-zeroes": "unmap",
  "driver": "qcow",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/a",
-    "node-name": "node-a-s",
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "node-a-s",
  "backing": "node-b-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/a",
+  "node-name": "node-a-s",
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "node-b-f",
  "read-only": true,
  "discard": "unmap",
  "driver": "qed",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/b",
-    "node-name": "node-b-s",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-b-s",
  "backing": "node-c-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/b",
+  "node-name": "node-b-s",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-c-f",
  "read-only": true,
  "discard": "unmap",
  "driver": "vmdk",
-  "file": {
-    "driver": "gluster",
-    "volume": "images",
-    "path": "c",
-    "server": [
-      {
-        "type": "inet",
-        "host": "test.org",
-        "port": "24007"
-      }
-    ],
-    "node-name": "node-c-s",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-c-s",
  "backing": "node-d-f"
 }
+{
+  "driver": "gluster",
+  "volume": "images",
+  "path": "c",
+  "server": [
+    {
+      "type": "inet",
+      "host": "test.org",
+      "port": "24007"
+    }
+  ],
+  "node-name": "node-c-s",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-d-f",
  "read-only": true,
  "discard": "unmap",
  "driver": "raw",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/d",
-    "node-name": "node-d-s",
-    "read-only": true,
-    "discard": "unmap"
-  }
+  "file": "node-d-s"
+}
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/d",
+  "node-name": "node-d-s",
+  "read-only": true,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-backing_basic-unmap-ignore.json
+++ b/tests/qemublocktestdata/xml2json/file-backing_basic-unmap-ignore.json
@ -4,61 +4,65 @@
  "discard": "ignore",
  "detect-zeroes": "on",
  "driver": "qcow",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/a",
-    "node-name": "node-a-s",
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "node-a-s",
  "backing": "node-b-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/a",
+  "node-name": "node-a-s",
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "node-b-f",
  "read-only": true,
  "discard": "ignore",
  "driver": "qed",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/b",
-    "node-name": "node-b-s",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-b-s",
  "backing": "node-c-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/b",
+  "node-name": "node-b-s",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-c-f",
  "read-only": true,
  "discard": "ignore",
  "driver": "vmdk",
-  "file": {
-    "driver": "gluster",
-    "volume": "images",
-    "path": "c",
-    "server": [
-      {
-        "type": "inet",
-        "host": "test.org",
-        "port": "24007"
-      }
-    ],
-    "node-name": "node-c-s",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-c-s",
  "backing": "node-d-f"
 }
+{
+  "driver": "gluster",
+  "volume": "images",
+  "path": "c",
+  "server": [
+    {
+      "type": "inet",
+      "host": "test.org",
+      "port": "24007"
+    }
+  ],
+  "node-name": "node-c-s",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-d-f",
  "read-only": true,
  "discard": "ignore",
  "driver": "raw",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/d",
-    "node-name": "node-d-s",
-    "read-only": true,
-    "discard": "unmap"
-  }
+  "file": "node-d-s"
+}
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/d",
+  "node-name": "node-d-s",
+  "read-only": true,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-backing_basic-unmap.json
+++ b/tests/qemublocktestdata/xml2json/file-backing_basic-unmap.json
@ -3,61 +3,65 @@
  "read-only": false,
  "discard": "unmap",
  "driver": "qcow",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/a",
-    "node-name": "node-a-s",
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "node-a-s",
  "backing": "node-b-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/a",
+  "node-name": "node-a-s",
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "node-b-f",
  "read-only": true,
  "discard": "unmap",
  "driver": "qed",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/b",
-    "node-name": "node-b-s",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-b-s",
  "backing": "node-c-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/b",
+  "node-name": "node-b-s",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-c-f",
  "read-only": true,
  "discard": "unmap",
  "driver": "vmdk",
-  "file": {
-    "driver": "gluster",
-    "volume": "images",
-    "path": "c",
-    "server": [
-      {
-        "type": "inet",
-        "host": "test.org",
-        "port": "24007"
-      }
-    ],
-    "node-name": "node-c-s",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-c-s",
  "backing": "node-d-f"
 }
+{
+  "driver": "gluster",
+  "volume": "images",
+  "path": "c",
+  "server": [
+    {
+      "type": "inet",
+      "host": "test.org",
+      "port": "24007"
+    }
+  ],
+  "node-name": "node-c-s",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "node-d-f",
  "read-only": true,
  "discard": "unmap",
  "driver": "raw",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/d",
-    "node-name": "node-d-s",
-    "read-only": true,
-    "discard": "unmap"
-  }
+  "file": "node-d-s"
+}
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/d",
+  "node-name": "node-d-s",
+  "read-only": true,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-bochs-noopts.json
+++ b/tests/qemublocktestdata/xml2json/file-bochs-noopts.json
@ -2,11 +2,12 @@
  "node-name": "test1",
  "read-only": false,
  "driver": "bochs",
-  "file": {
-    "driver": "file",
-    "filename": "/path/to/i.img",
-    "node-name": "test2",
-    "read-only": false,
-    "discard": "unmap"
-  }
+  "file": "test2"
+}
+{
+  "driver": "file",
+  "filename": "/path/to/i.img",
+  "node-name": "test2",
+  "read-only": false,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-cloop-noopts.json
+++ b/tests/qemublocktestdata/xml2json/file-cloop-noopts.json
@ -2,11 +2,12 @@
  "node-name": "test1",
  "read-only": false,
  "driver": "cloop",
-  "file": {
-    "driver": "file",
-    "filename": "/path/to/i.img",
-    "node-name": "test2",
-    "read-only": false,
-    "discard": "unmap"
-  }
+  "file": "test2"
+}
+{
+  "driver": "file",
+  "filename": "/path/to/i.img",
+  "node-name": "test2",
+  "read-only": false,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-dmg-noopts.json
+++ b/tests/qemublocktestdata/xml2json/file-dmg-noopts.json
@ -2,11 +2,12 @@
  "node-name": "test1",
  "read-only": false,
  "driver": "dmg",
-  "file": {
-    "driver": "file",
-    "filename": "/path/to/i.img",
-    "node-name": "test2",
-    "read-only": false,
-    "discard": "unmap"
-  }
+  "file": "test2"
+}
+{
+  "driver": "file",
+  "filename": "/path/to/i.img",
+  "node-name": "test2",
+  "read-only": false,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-ploop-noopts.json
+++ b/tests/qemublocktestdata/xml2json/file-ploop-noopts.json
@ -2,11 +2,12 @@
  "node-name": "test1",
  "read-only": false,
  "driver": "parallels",
-  "file": {
-    "driver": "file",
-    "filename": "/path/to/i.img",
-    "node-name": "test2",
-    "read-only": false,
-    "discard": "unmap"
-  }
+  "file": "test2"
+}
+{
+  "driver": "file",
+  "filename": "/path/to/i.img",
+  "node-name": "test2",
+  "read-only": false,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-qcow2-backing-chain-encryption.json
+++ b/tests/qemublocktestdata/xml2json/file-qcow2-backing-chain-encryption.json
@ -6,15 +6,16 @@
    "format": "luks",
    "key-secret": "node-b-f-encalias"
  },
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/a",
-    "node-name": "node-a-s",
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "node-a-s",
  "backing": "node-b-f"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/a",
+  "node-name": "node-a-s",
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "node-b-f",
  "read-only": true,
@ -23,12 +24,13 @@
    "format": "aes",
    "key-secret": "node-b-f-encalias"
  },
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/b",
-    "node-name": "node-b-s",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-b-s",
  "backing": null
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/b",
+  "node-name": "node-b-s",
+  "read-only": true,
+  "discard": "unmap"
+}
--- a/tests/qemublocktestdata/xml2json/file-qcow2-backing-chain-noopts.json
+++ b/tests/qemublocktestdata/xml2json/file-qcow2-backing-chain-noopts.json
@ -2,129 +2,139 @@
  "node-name": "#block126",
  "read-only": false,
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/rhel7.3.1507297895",
-    "node-name": "#block004",
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "#block004",
  "backing": "#block313"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/rhel7.3.1507297895",
+  "node-name": "#block004",
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "#block313",
  "read-only": true,
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/rhel7.3.1484071872",
-    "node-name": "#block256",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "#block256",
  "backing": "#block556"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/rhel7.3.1484071872",
+  "node-name": "#block256",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "#block556",
  "read-only": true,
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/rhel7.3.1483615252",
-    "node-name": "#block418",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "#block418",
  "backing": "#block767"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/rhel7.3.1483615252",
+  "node-name": "#block418",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "#block767",
  "read-only": true,
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/rhel7.3.1483605924",
-    "node-name": "#block624",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "#block624",
  "backing": "#block937"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/rhel7.3.1483605924",
+  "node-name": "#block624",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "#block937",
  "read-only": true,
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/rhel7.3.1483605920",
-    "node-name": "#block869",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "#block869",
  "backing": "#block1157"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/rhel7.3.1483605920",
+  "node-name": "#block869",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "#block1157",
  "read-only": true,
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/rhel7.3.1483546244",
-    "node-name": "#block1047",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "#block1047",
  "backing": "#block1392"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/rhel7.3.1483546244",
+  "node-name": "#block1047",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "#block1392",
  "read-only": true,
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/rhel7.3.1483545901",
-    "node-name": "#block1279",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "#block1279",
  "backing": "#block1523"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/rhel7.3.1483545901",
+  "node-name": "#block1279",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "#block1523",
  "read-only": true,
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/rhel7.3.1483545313",
-    "node-name": "#block1444",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "#block1444",
  "backing": "#block1742"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/rhel7.3.1483545313",
+  "node-name": "#block1444",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "#block1742",
  "read-only": true,
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/rhel7.3.1483536402",
-    "node-name": "#block1602",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "#block1602",
  "backing": "#block1909"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/rhel7.3.1483536402",
+  "node-name": "#block1602",
+  "read-only": true,
+  "discard": "unmap"
+}
 {
  "node-name": "#block1909",
  "read-only": true,
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/rhel7.3.qcow2",
-    "node-name": "#block1864",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "#block1864",
  "backing": null
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/rhel7.3.qcow2",
+  "node-name": "#block1864",
+  "read-only": true,
+  "discard": "unmap"
+}
--- a/tests/qemublocktestdata/xml2json/file-qcow2-backing-chain-unterminated.json
+++ b/tests/qemublocktestdata/xml2json/file-qcow2-backing-chain-unterminated.json
@ -2,24 +2,26 @@
  "node-name": "#block126",
  "read-only": false,
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/rhel7.3.1507297895",
-    "node-name": "#block004",
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "#block004",
  "backing": "#block313"
 }
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/rhel7.3.1507297895",
+  "node-name": "#block004",
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "#block313",
  "read-only": true,
  "driver": "qcow2",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/rhel7.3.1484071872",
-    "node-name": "#block256",
-    "read-only": true,
-    "discard": "unmap"
-  }
+  "file": "#block256"
+}
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/rhel7.3.1484071872",
+  "node-name": "#block256",
+  "read-only": true,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-raw-aio_native.json
+++ b/tests/qemublocktestdata/xml2json/file-raw-aio_native.json
@ -6,16 +6,17 @@
    "no-flush": false
  },
  "driver": "raw",
-  "file": {
-    "driver": "file",
-    "filename": "/path/to/i.img",
-    "aio": "native",
-    "node-name": "test2",
-    "cache": {
-      "direct": true,
-      "no-flush": false
-    },
-    "read-only": false,
-    "discard": "unmap"
-  }
+  "file": "test2"
+}
+{
+  "driver": "file",
+  "filename": "/path/to/i.img",
+  "aio": "native",
+  "node-name": "test2",
+  "cache": {
+    "direct": true,
+    "no-flush": false
+  },
+  "read-only": false,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-raw-luks.json
+++ b/tests/qemublocktestdata/xml2json/file-raw-luks.json
@ -3,11 +3,12 @@
  "read-only": false,
  "driver": "luks",
  "key-secret": "test1-encalias",
-  "file": {
-    "driver": "file",
-    "filename": "/path/luks.img",
-    "node-name": "test2",
-    "read-only": false,
-    "discard": "unmap"
-  }
+  "file": "test2"
+}
+{
+  "driver": "file",
+  "filename": "/path/luks.img",
+  "node-name": "test2",
+  "read-only": false,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-raw-noopts.json
+++ b/tests/qemublocktestdata/xml2json/file-raw-noopts.json
@ -2,11 +2,12 @@
  "node-name": "0123456789ABCDEF0123456789ABCDE",
  "read-only": false,
  "driver": "raw",
-  "file": {
-    "driver": "file",
-    "filename": "/var/lib/libvirt/images/i.img",
-    "node-name": "0123456789ABCDEF0123456789ABCDE",
-    "read-only": false,
-    "discard": "unmap"
-  }
+  "file": "0123456789ABCDEF0123456789ABCDE"
+}
+{
+  "driver": "file",
+  "filename": "/var/lib/libvirt/images/i.img",
+  "node-name": "0123456789ABCDEF0123456789ABCDE",
+  "read-only": false,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-vdi-noopts.json
+++ b/tests/qemublocktestdata/xml2json/file-vdi-noopts.json
@ -2,11 +2,12 @@
  "node-name": "test1",
  "read-only": false,
  "driver": "vdi",
-  "file": {
-    "driver": "file",
-    "filename": "/path/to/i.img",
-    "node-name": "test2",
-    "read-only": false,
-    "discard": "unmap"
-  }
+  "file": "test2"
+}
+{
+  "driver": "file",
+  "filename": "/path/to/i.img",
+  "node-name": "test2",
+  "read-only": false,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-vhd-noopts.json
+++ b/tests/qemublocktestdata/xml2json/file-vhd-noopts.json
@ -2,11 +2,12 @@
  "node-name": "test1",
  "read-only": false,
  "driver": "vhdx",
-  "file": {
-    "driver": "file",
-    "filename": "/path/to/i.img",
-    "node-name": "test2",
-    "read-only": false,
-    "discard": "unmap"
-  }
+  "file": "test2"
+}
+{
+  "driver": "file",
+  "filename": "/path/to/i.img",
+  "node-name": "test2",
+  "read-only": false,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/file-vpc-noopts.json
+++ b/tests/qemublocktestdata/xml2json/file-vpc-noopts.json
@ -2,11 +2,12 @@
  "node-name": "test1",
  "read-only": false,
  "driver": "vpc",
-  "file": {
-    "driver": "file",
-    "filename": "/path/to/i.img",
-    "node-name": "test2",
-    "read-only": false,
-    "discard": "unmap"
-  }
+  "file": "test2"
+}
+{
+  "driver": "file",
+  "filename": "/path/to/i.img",
+  "node-name": "test2",
+  "read-only": false,
+  "discard": "unmap"
 }
--- a/tests/qemublocktestdata/xml2json/network-qcow2-backing-chain-cache-unsafe.json
+++ b/tests/qemublocktestdata/xml2json/network-qcow2-backing-chain-cache-unsafe.json
@ -6,31 +6,32 @@
    "no-flush": true
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "rbd",
-    "pool": "rbdpool",
-    "image": "rbdimg",
-    "server": [
-      {
-        "host": "host1.example.com",
-        "port": "0"
-      },
-      {
-        "host": "host2.example.com",
-        "port": "0"
-      }
-    ],
-    "user": "testuser-rbd",
-    "node-name": "node-a-s",
-    "cache": {
-      "direct": false,
-      "no-flush": true
-    },
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "node-a-s",
  "backing": "node-b-f"
 }
+{
+  "driver": "rbd",
+  "pool": "rbdpool",
+  "image": "rbdimg",
+  "server": [
+    {
+      "host": "host1.example.com",
+      "port": "0"
+    },
+    {
+      "host": "host2.example.com",
+      "port": "0"
+    }
+  ],
+  "user": "testuser-rbd",
+  "node-name": "node-a-s",
+  "cache": {
+    "direct": false,
+    "no-flush": true
+  },
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "node-b-f",
  "read-only": true,
@ -39,19 +40,20 @@
    "no-flush": true
  },
  "driver": "qcow2",
-  "file": {
-    "driver": "iscsi",
-    "portal": "example.org:3260",
-    "target": "iscsitarget",
-    "lun": 1,
-    "transport": "tcp",
-    "node-name": "node-b-s",
-    "cache": {
-      "direct": false,
-      "no-flush": true
-    },
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-b-s",
  "backing": null
 }
+{
+  "driver": "iscsi",
+  "portal": "example.org:3260",
+  "target": "iscsitarget",
+  "lun": 1,
+  "transport": "tcp",
+  "node-name": "node-b-s",
+  "cache": {
+    "direct": false,
+    "no-flush": true
+  },
+  "read-only": true,
+  "discard": "unmap"
+}
--- a/tests/qemublocktestdata/xml2json/network-qcow2-backing-chain-encryption_auth.json
+++ b/tests/qemublocktestdata/xml2json/network-qcow2-backing-chain-encryption_auth.json
@ -6,27 +6,28 @@
    "format": "luks",
    "key-secret": "node-b-f-encalias"
  },
-  "file": {
-    "driver": "rbd",
-    "pool": "rbdpool",
-    "image": "rbdimg",
-    "server": [
-      {
-        "host": "host1.example.com",
-        "port": "0"
-      },
-      {
-        "host": "host2.example.com",
-        "port": "0"
-      }
-    ],
-    "user": "testuser-rbd",
-    "node-name": "node-a-s",
-    "read-only": false,
-    "discard": "unmap"
-  },
+  "file": "node-a-s",
  "backing": "node-b-f"
 }
+{
+  "driver": "rbd",
+  "pool": "rbdpool",
+  "image": "rbdimg",
+  "server": [
+    {
+      "host": "host1.example.com",
+      "port": "0"
+    },
+    {
+      "host": "host2.example.com",
+      "port": "0"
+    }
+  ],
+  "user": "testuser-rbd",
+  "node-name": "node-a-s",
+  "read-only": false,
+  "discard": "unmap"
+}
 {
  "node-name": "node-b-f",
  "read-only": true,
@ -35,17 +36,18 @@
    "format": "aes",
    "key-secret": "node-b-f-encalias"
  },
-  "file": {
-    "driver": "iscsi",
-    "portal": "example.org:3260",
-    "target": "iqn.2016-09.com.example:iscsitarget",
-    "lun": 1,
-    "transport": "tcp",
-    "user": "testuser-iscsi",
-    "password-secret": "node-b-s-secalias",
-    "node-name": "node-b-s",
-    "read-only": true,
-    "discard": "unmap"
-  },
+  "file": "node-b-s",
  "backing": null
 }
+{
+  "driver": "iscsi",
+  "portal": "example.org:3260",
+  "target": "iqn.2016-09.com.example:iscsitarget",
+  "lun": 1,
+  "transport": "tcp",
+  "user": "testuser-iscsi",
+  "password-secret": "node-b-s-secalias",
+  "node-name": "node-b-s",
+  "read-only": true,
+  "discard": "unmap"
+}