latency: Wire up the remote protocol

daemon/remote.c

@@ -932,6 +932,75 @@ cleanup:
     return rv;
 }
 
+static int
+remoteDispatchDomainBlockStatsFlags(virNetServerPtr server ATTRIBUTE_UNUSED,
+                                    virNetServerClientPtr client ATTRIBUTE_UNUSED,
+                                    virNetMessageHeaderPtr hdr ATTRIBUTE_UNUSED,
+                                    virNetMessageErrorPtr rerr,
+                                    remote_domain_block_stats_flags_args *args,
+                                    remote_domain_block_stats_flags_ret *ret)
+{
+    virTypedParameterPtr params = NULL;
+    virDomainPtr dom = NULL;
+    int i;
+    const char *path = args->path;
+    int nparams = args->nparams;
+    unsigned int flags;
+    int rv = -1;
+    struct daemonClientPrivate *priv =
+        virNetServerClientGetPrivateData(client);
+
+    if (!priv->conn) {
+        virNetError(VIR_ERR_INTERNAL_ERROR, "%s", _("connection not open"));
+        goto cleanup;
+    }
+
+    if (!(dom = get_nonnull_domain(priv->conn, args->dom)))
+        goto cleanup;
+    flags = args->flags;
+
+    if (nparams > REMOTE_DOMAIN_BLOCK_STATS_PARAMETERS_MAX) {
+        virNetError(VIR_ERR_INTERNAL_ERROR, "%s", _("nparams too large"));
+        goto cleanup;
+    }
+    if (VIR_ALLOC_N(params, nparams) < 0) {
+        virReportOOMError();
+        goto cleanup;
+    }
+
+    if (virDomainBlockStatsFlags(dom, path, params, &nparams, 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 stats. */
+    if (remoteSerializeTypedParameters(params, nparams,
+                                       &ret->params.params_val,
+                                       &ret->params.params_len) < 0)
+        goto cleanup;
+
+success:
+    rv = 0;
+
+cleanup:
+    if (rv < 0) {
+        virNetMessageSaveError(rerr);
+        if (ret->params.params_val) {
+            for (i = 0; i < nparams; i++)
+                VIR_FREE(ret->params.params_val[i].field);
+            VIR_FREE(ret->params.params_val);
+        }
+    }
+    VIR_FREE(params);
+    return rv;
+}
+
 static int
 remoteDispatchDomainMemoryPeek(virNetServerPtr server ATTRIBUTE_UNUSED,
                                virNetServerClientPtr client ATTRIBUTE_UNUSED,

src/remote/remote_driver.c

@@ -1360,6 +1360,69 @@ cleanup:
     return rv;
 }
 
+static int
+remoteDomainBlockStatsFlags(virDomainPtr domain,
+                            const char *path,
+                            virTypedParameterPtr params,
+                            int *nparams,
+                            unsigned int flags)
+{
+    int rv = -1;
+    remote_domain_block_stats_flags_args args;
+    remote_domain_block_stats_flags_ret ret;
+    struct private_data *priv = domain->conn->privateData;
+
+    remoteDriverLock(priv);
+
+    make_nonnull_domain (&args.dom, domain);
+    args.nparams = *nparams;
+    args.path = (char *) path;
+    args.flags = flags;
+
+    memset (&ret, 0, sizeof ret);
+    if (call (domain->conn, priv, 0, REMOTE_PROC_DOMAIN_BLOCK_STATS_FLAGS,
+              (xdrproc_t) xdr_remote_domain_block_stats_flags_args, (char *) &args,
+              (xdrproc_t) xdr_remote_domain_block_stats_flags_ret, (char *) &ret) == -1)
+        goto done;
+
+    /* Check the length of the returned list carefully. */
+    if (ret.params.params_len > REMOTE_DOMAIN_BLOCK_STATS_PARAMETERS_MAX ||
+        ret.params.params_len > *nparams) {
+        remoteError(VIR_ERR_RPC, "%s",
+                    _("remoteDomainBlockStatsFlags: "
+                      "returned number of stats exceeds limit"));
+        goto cleanup;
+    }
+
+    /* Handle the case when the caller does not know the number of stats
+     * and is asking for the number of stats supported
+     */
+    if (*nparams == 0) {
+        *nparams = ret.nparams;
+        rv = 0;
+        goto cleanup;
+    }
+
+    *nparams = ret.params.params_len;
+
+    /* Deserialise the result. */
+    if (remoteDeserializeTypedParameters(ret.params.params_val,
+                                         ret.params.params_len,
+                                         REMOTE_DOMAIN_MEMORY_PARAMETERS_MAX,
+                                         params,
+                                         nparams) < 0)
+        goto cleanup;
+
+    rv = 0;
+
+cleanup:
+    xdr_free ((xdrproc_t) xdr_remote_domain_block_stats_flags_ret,
+              (char *) &ret);
+done:
+    remoteDriverUnlock(priv);
+    return rv;
+}
+
 static int
 remoteDomainGetMemoryParameters (virDomainPtr domain,
                                  virTypedParameterPtr params, int *nparams,
@@ -4307,6 +4370,7 @@ static virDriver remote_driver = {
     .domainMigratePerform = remoteDomainMigratePerform, /* 0.3.2 */
     .domainMigrateFinish = remoteDomainMigrateFinish, /* 0.3.2 */
     .domainBlockStats = remoteDomainBlockStats, /* 0.3.2 */
+    .domainBlockStatsFlags = remoteDomainBlockStatsFlags, /* 0.9.5 */
     .domainInterfaceStats = remoteDomainInterfaceStats, /* 0.3.2 */
     .domainMemoryStats = remoteDomainMemoryStats, /* 0.7.5 */
     .domainBlockPeek = remoteDomainBlockPeek, /* 0.4.2 */

src/remote/remote_protocol.x

@@ -131,6 +131,9 @@ const REMOTE_NODE_CPU_STATS_MAX = 16;
 /* Upper limit on list of node memory stats. */
 const REMOTE_NODE_MEMORY_STATS_MAX = 16;
 
+/* Upper limit on list of block stats. */
+const REMOTE_DOMAIN_BLOCK_STATS_PARAMETERS_MAX = 16;
+
 /* Upper limit on number of NUMA cells */
 const REMOTE_NODE_MAX_CELLS = 1024;
 
@@ -331,6 +334,7 @@ struct remote_node_get_memory_stats {
     unsigned hyper value;
 };
 
+
 /*----- Calls. -----*/
 
 /* For each call we may have a 'remote_CALL_args' and 'remote_CALL_ret'
@@ -544,6 +548,18 @@ struct remote_domain_block_stats_ret { /* insert@2 */
     hyper errs;
 };
 
+struct remote_domain_block_stats_flags_args {
+    remote_nonnull_domain dom;
+    remote_nonnull_string path;
+    int nparams;
+    unsigned int flags;
+};
+
+struct remote_domain_block_stats_flags_ret {
+    remote_typed_param params<REMOTE_DOMAIN_BLOCK_STATS_PARAMETERS_MAX>;
+    int nparams;
+};
+
 struct remote_domain_interface_stats_args {
     remote_nonnull_domain dom;
     remote_nonnull_string path;
@@ -2492,7 +2508,8 @@ enum remote_procedure {
     REMOTE_PROC_DOMAIN_BLOCK_PULL = 240, /* autogen autogen */
 
     REMOTE_PROC_DOMAIN_EVENT_BLOCK_JOB = 241, /* skipgen skipgen */
-    REMOTE_PROC_DOMAIN_MIGRATE_GET_MAX_SPEED = 242 /* autogen autogen */
+    REMOTE_PROC_DOMAIN_MIGRATE_GET_MAX_SPEED = 242, /* autogen autogen */
+    REMOTE_PROC_DOMAIN_BLOCK_STATS_FLAGS = 243 /* skipgen skipgen */
 
     /*
      * Notice how the entries are grouped in sets of 10 ?