[libvirt] [PATCH 1/3] qemu: command: Separate wrapping of disk backend props to 'file' object

[Peter Krempa]

The file object is needed when formatting the command line, but it makes
nesting of the objects less easy for use with blockdev. Separate the
wrapping into the 'file' object into a helper used specifically for disk
sources in the old code path.
---
 src/qemu/qemu_block.c   | 14 +++-----------
 src/qemu/qemu_command.c | 27 ++++++++++++++++++++++++++-
 2 files changed, 29 insertions(+), 12 deletions(-)

diff --git a/src/qemu/qemu_block.c b/src/qemu/qemu_block.c
index 8d232de3e..4c0f675ca 100644
--- a/src/qemu/qemu_block.c
+++ b/src/qemu/qemu_block.c
@@ -572,7 +572,6 @@ qemuBlockStorageSourceGetBackendProps(virStorageSourcePtr src)
 {
     int actualType = virStorageSourceGetActualType(src);
     virJSONValuePtr fileprops = NULL;
-    virJSONValuePtr ret = NULL;

     switch ((virStorageType) actualType) {
     case VIR_STORAGE_TYPE_BLOCK:
@@ -587,12 +586,12 @@ qemuBlockStorageSourceGetBackendProps(virStorageSourcePtr src)
         switch ((virStorageNetProtocol) src->protocol) {
         case VIR_STORAGE_NET_PROTOCOL_GLUSTER:
             if (!(fileprops = qemuBlockStorageSourceGetGlusterProps(src)))
-                goto cleanup;
+                return NULL;
             break;

         case VIR_STORAGE_NET_PROTOCOL_VXHS:
             if (!(fileprops = qemuBlockStorageSourceGetVxHSProps(src)))
-                goto cleanup;
+                return NULL;
             break;

         case VIR_STORAGE_NET_PROTOCOL_NBD:
@@ -612,12 +611,5 @@ qemuBlockStorageSourceGetBackendProps(virStorageSourcePtr src)
         break;
     }

-    if (virJSONValueObjectCreate(&ret, "a:file", fileprops, NULL) < 0)
-        goto cleanup;
-
-    fileprops = NULL;
-
- cleanup:
-    virJSONValueFree(fileprops);
-    return ret;
+    return fileprops;
 }
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 9c8bde49a..f6313c007 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -1370,6 +1370,31 @@ qemuDiskSourceNeedsProps(virStorageSourcePtr src)
 }


+/**
+ * qemuDiskSourceGetProps:
+ * @src: disk source struct
+ *
+ * Returns the disk source struct wrapped so that it can be used as disk source
+ * directly by converting it from json.
+ */
+static virJSONValuePtr
+qemuDiskSourceGetProps(virStorageSourcePtr src)
+{
+    virJSONValuePtr props;
+    virJSONValuePtr ret;
+
+    if (!(props = qemuBlockStorageSourceGetBackendProps(src)))
+        return NULL;
+
+    if (virJSONValueObjectCreate(&ret, "a:file", props, NULL) < 0) {
+        virJSONValueFree(props);
+        return NULL;
+    }
+
+    return ret;
+}
+
+
 static int
 qemuBuildDriveSourceStr(virDomainDiskDefPtr disk,
                         virQEMUDriverConfigPtr cfg,
@@ -1385,7 +1410,7 @@ qemuBuildDriveSourceStr(virDomainDiskDefPtr disk,
     int ret = -1;

     if (qemuDiskSourceNeedsProps(disk->src) &&
-        !(srcprops = qemuBlockStorageSourceGetBackendProps(disk->src)))
+        !(srcprops = qemuDiskSourceGetProps(disk->src)))
         goto cleanup;

     if (!srcprops &&
-- 
2.14.1