Add virDomain{Set, Get}BlockIoTune support to the remote driver

Support Block I/O Throttle setting and query to remote driver.

Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com>
Signed-off-by: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
Signed-off-by: Eric Blake <eblake@redhat.com>

daemon/remote.c

@@ -1891,6 +1891,70 @@ cleanup:
     return rv;
 }
 
+static int
+remoteDispatchDomainGetBlockIoTune(virNetServerPtr server ATTRIBUTE_UNUSED,
+                                   virNetServerClientPtr client ATTRIBUTE_UNUSED,
+                                   virNetMessagePtr hdr ATTRIBUTE_UNUSED,
+                                   virNetMessageErrorPtr rerr,
+                                   remote_domain_get_block_io_tune_args *args,
+                                   remote_domain_get_block_io_tune_ret *ret)
+{
+    virDomainPtr dom = NULL;
+    int rv = -1;
+    virTypedParameterPtr params = NULL;
+    int nparams = args->nparams;
+    struct daemonClientPrivate *priv =
+        virNetServerClientGetPrivateData(client);
+
+    if (!priv->conn) {
+        virNetError(VIR_ERR_INTERNAL_ERROR, "%s", _("connection not open"));
+        goto cleanup;
+    }
+
+    if (nparams > REMOTE_DOMAIN_BLOCK_IO_TUNE_PARAMETERS_MAX) {
+        virNetError(VIR_ERR_INTERNAL_ERROR, "%s", _("nparams too large"));
+        goto cleanup;
+    }
+
+    if (VIR_ALLOC_N(params, nparams) < 0) {
+        virReportOOMError();
+        goto cleanup;
+    }
+
+    if (!(dom = get_nonnull_domain(priv->conn, args->dom)))
+        goto cleanup;
+
+    if (virDomainGetBlockIoTune(dom, args->disk ? *args->disk : NULL,
+                                params, &nparams, args->flags) < 0)
+        goto cleanup;
+
+    /* In this case, we need to send back the number of parameters
+     * supported
+     */
+    if (args->nparams == 0) {
+        ret->nparams = nparams;
+        goto success;
+    }
+
+    /* Serialise the block I/O tuning parameters. */
+    if (remoteSerializeTypedParameters(params, nparams,
+                                       &ret->params.params_val,
+                                       &ret->params.params_len,
+                                       args->flags) < 0)
+        goto cleanup;
+
+success:
+    rv = 0;
+
+cleanup:
+    if (rv < 0)
+        virNetMessageSaveError(rerr);
+    virTypedParameterArrayClear(params, nparams);
+    VIR_FREE(params);
+    if (dom)
+        virDomainFree(dom);
+    return rv;
+}
 
 /*-------------------------------------------------------------*/