qemu: monitor: Add APIs for 'blockdev-create'

The 'blockdev-create' starts a job which creates a storage volume using
the given protocol or formats an existing (added) volume with one of the
supported storage formats.

This patch adds the monitor interaction bits.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NJán Tomko <jtomko@redhat.com>

src/qemu/qemu_monitor.c

@@ -4419,6 +4419,36 @@ qemuMonitorSetWatchdogAction(qemuMonitorPtr mon,
 }
 
 
+/**
+ * qemuMonitorBlockdevCreate:
+ * @mon: monitor object
+ * @jobname: name of the job
+ * @props: JSON object describing the blockdev to add
+ *
+ * Instructs qemu to create/format a new stroage or format layer. Note that
+ * the job does not add the created/formatted image into qemu and
+ * qemuMonitorBlockdevAdd needs to be called separately with corresponding
+ * arguments. Note that the arguments for creating and adding are different.
+ *
+ * Note that @props is always consumed by this function and should not be
+ * accessed after calling this function.
+ */
+int
+qemuMonitorBlockdevCreate(qemuMonitorPtr mon,
+                          const char *jobname,
+                          virJSONValuePtr props)
+{
+    VIR_DEBUG("jobname=%s props=%p", jobname, props);
+
+    QEMU_CHECK_MONITOR_GOTO(mon, error);
+
+    return qemuMonitorJSONBlockdevCreate(mon, jobname, props);
+
+ error:
+    virJSONValueFree(props);
+    return -1;
+}
+
 /**
  * qemuMonitorBlockdevAdd:
  * @mon: monitor object

src/qemu/qemu_monitor.h

@@ -1290,6 +1290,10 @@ virJSONValuePtr qemuMonitorQueryNamedBlockNodes(qemuMonitorPtr mon);
 int qemuMonitorSetWatchdogAction(qemuMonitorPtr mon,
                                  const char *action);
 
+int qemuMonitorBlockdevCreate(qemuMonitorPtr mon,
+                              const char *jobname,
+                              virJSONValuePtr props);
+
 int qemuMonitorBlockdevAdd(qemuMonitorPtr mon,
                            virJSONValuePtr props);
 

src/qemu/qemu_monitor_json.c

@@ -8638,6 +8638,32 @@ qemuMonitorJSONSetWatchdogAction(qemuMonitorPtr mon,
 }
 
 
+int
+qemuMonitorJSONBlockdevCreate(qemuMonitorPtr mon,
+                              const char *jobname,
+                              virJSONValuePtr props)
+{
+    VIR_AUTOPTR(virJSONValue) cmd = NULL;
+    VIR_AUTOPTR(virJSONValue) reply = NULL;
+
+    cmd = qemuMonitorJSONMakeCommand("blockdev-create",
+                                     "s:job-id", jobname,
+                                     "a:options", &props,
+                                     NULL);
+    virJSONValueFree(props);
+    if (!cmd)
+        return -1;
+
+    if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0)
+        return -1;
+
+    if (qemuMonitorJSONCheckError(cmd, reply) < 0)
+        return -1;
+
+    return 0;
+}
+
+
 int
 qemuMonitorJSONBlockdevAdd(qemuMonitorPtr mon,
                            virJSONValuePtr props)

src/qemu/qemu_monitor_json.h

@@ -581,6 +581,11 @@ int qemuMonitorJSONSetWatchdogAction(qemuMonitorPtr mon,
                                      const char *action)
     ATTRIBUTE_NONNULL(1);
 
+int qemuMonitorJSONBlockdevCreate(qemuMonitorPtr mon,
+                                  const char *jobname,
+                                  virJSONValuePtr props)
+    ATTRIBUTE_NONNULL(1);
+
 int qemuMonitorJSONBlockdevAdd(qemuMonitorPtr mon,
                                virJSONValuePtr props)
     ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2);