Format the backing chain onto the commandline using the 'json' syntax
with -blockdev.

The command line formatter needs only minor tweaks to add the new
entries but we now need to initialize the strucutres that are used for
every layer of the backing chain.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
---
 src/qemu/qemu_command.c | 84 ++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 76 insertions(+), 8 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index ae45c45b7f..7fa366cd3f 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -2237,6 +2237,8 @@ static int
 qemuBuildBlockStorageSourceAttachDataCommandline(virCommandPtr cmd,
                                                  qemuBlockStorageSourceAttachDataPtr data)
 {
+    char *tmp;
+
     if (qemuBuildObjectCommandline(cmd, data->prmgrProps) < 0 ||
         qemuBuildObjectCommandline(cmd, data->authsecretProps) < 0 ||
         qemuBuildObjectCommandline(cmd, data->encryptsecretProps) < 0 ||
@@ -2246,6 +2248,22 @@ qemuBuildBlockStorageSourceAttachDataCommandline(virCommandPtr cmd,
     if (data->driveCmd)
         virCommandAddArgList(cmd, "-drive", data->driveCmd, NULL);

+    if (data->storageProps) {
+        if (!(tmp = virJSONValueToString(data->storageProps, false)))
+            return -1;
+
+        virCommandAddArgList(cmd, "-blockdev", tmp, NULL);
+        VIR_FREE(tmp);
+    }
+
+    if (data->formatProps) {
+        if (!(tmp = virJSONValueToString(data->formatProps, false)))
+            return -1;
+
+        virCommandAddArgList(cmd, "-blockdev", tmp, NULL);
+        VIR_FREE(tmp);
+    }
+
     return 0;
 }

@@ -2256,21 +2274,71 @@ qemuBuildDiskSourceCommandLine(virCommandPtr cmd,
                                virQEMUCapsPtr qemuCaps,
                                bool driveBoot)
 {
-    qemuBlockStorageSourceAttachDataPtr data = NULL;
+    qemuBlockStorageSourceAttachDataPtr *data = NULL;
+    size_t ndata = 0;
+    qemuBlockStorageSourceAttachDataPtr tmp = NULL;
+    virJSONValuePtr copyOnReadProps = NULL;
+    virStorageSourcePtr n;
+    char *str = NULL;
+    size_t i;
     int ret = -1;

-    if (!(data = qemuBuildStorageSourceAttachPrepareDrive(disk, qemuCaps,
-                                                          driveBoot)))
-        return -1;
+    if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_BLOCKDEV)) {
+        if (virStorageSourceIsEmpty(disk->src)) {
+            ret = 0;
+            goto cleanup;
+        }

-    if (qemuBuildStorageSourceAttachPrepareCommon(disk->src, data, qemuCaps) < 0 ||
-        qemuBuildBlockStorageSourceAttachDataCommandline(cmd, data) < 0)
-        goto cleanup;
+        for (n = disk->src; virStorageSourceIsBacking(n); n = n->backingStore) {
+            if (!(tmp = qemuBlockStorageSourceAttachPrepareBlockdev(n)))
+                goto cleanup;
+
+            if (qemuBuildStorageSourceAttachPrepareCommon(n, tmp, qemuCaps) < 0)
+                goto cleanup;
+
+            if (VIR_APPEND_ELEMENT(data, ndata, tmp) < 0)
+                goto cleanup;
+        }
+
+        if (disk->copy_on_read == VIR_TRISTATE_SWITCH_ON &&
+            !(copyOnReadProps = qemuBlockStorageGetCopyOnReadProps(disk)))
+            goto cleanup;
+    } else {
+        if (!(tmp = qemuBuildStorageSourceAttachPrepareDrive(disk, qemuCaps,
+                                                             driveBoot)))
+            goto cleanup;
+
+        if (qemuBuildStorageSourceAttachPrepareCommon(disk->src, tmp,
+                                                      qemuCaps) < 0)
+            goto cleanup;
+
+        if (VIR_APPEND_ELEMENT(data, ndata, tmp) < 0)
+            goto cleanup;
+    }
+
+    for (i = ndata; i > 0; i--) {
+        if (qemuBuildBlockStorageSourceAttachDataCommandline(cmd,
+                                                             data[i - 1]) < 0)
+            goto cleanup;
+    }
+
+    if (copyOnReadProps) {
+        if (!(str = virJSONValueToString(copyOnReadProps, false)))
+            goto cleanup;
+
+        virCommandAddArgList(cmd, "-blockdev", str, NULL);
+        VIR_FREE(str);
+    }

     ret = 0;

  cleanup:
-    qemuBlockStorageSourceAttachDataFree(data);
+    for (i = 0; i < ndata; i++)
+        qemuBlockStorageSourceAttachDataFree(data[i]);
+    VIR_FREE(data);
+    qemuBlockStorageSourceAttachDataFree(tmp);
+    virJSONValueFree(copyOnReadProps);
+    VIR_FREE(str);
     return ret;
 }

-- 
2.16.2

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