[PATCHv2 35/62] qemu: command: format disk source commandline for -blockdev

[Peter Krempa <pkrempa@xxxxxxxxxx>]

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@xxxxxxxxxx>
---
 src/qemu/qemu_command.c | 82 ++++++++++++++++++++++++++++++++++++++++++++-----
 1 file changed, 75 insertions(+), 7 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 72fdffa92a..4a3dda28fe 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -2261,6 +2261,8 @@ 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 ||
@@ -2270,6 +2272,22 @@ 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;
 }

@@ -2279,20 +2297,70 @@ qemuBuildDiskSourceCommandLine(virCommandPtr cmd,
                                virDomainDiskDefPtr disk,
                                virQEMUCapsPtr qemuCaps)
 {
-    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)))
-        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)))
+            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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