storage: Add startPool and stopPool for scsi backend

startPool creates the vHBA if it's not existed yet, stopPool destroys
the vHBA. Also to support autostart, checkPool will creates the vHBA
if it's not existed yet.

src/storage/storage_backend_scsi.c

@@ -644,6 +644,62 @@ getAdapterName(virStoragePoolSourceAdapter adapter)
     return name;
 }
 
+static int
+createVport(virStoragePoolSourceAdapter adapter)
+{
+    unsigned int parent_host;
+    char *name = NULL;
+
+    if (adapter.type != VIR_STORAGE_POOL_SOURCE_ADAPTER_TYPE_FC_HOST)
+        return 0;
+
+    /* This filters either HBA or already created vHBA */
+    if ((name = virGetFCHostNameByWWN(NULL, adapter.data.fchost.wwnn,
+                                      adapter.data.fchost.wwpn))) {
+        VIR_FREE(name);
+        return 0;
+    }
+
+    if (!adapter.data.fchost.parent) {
+        virReportError(VIR_ERR_XML_ERROR, "%s",
+                       _("'parent' for vHBA must be specified"));
+        return -1;
+    }
+
+    if (getHostNumber(adapter.data.fchost.parent, &parent_host) < 0)
+        return -1;
+
+    if (virManageVport(parent_host, adapter.data.fchost.wwnn,
+                       adapter.data.fchost.wwpn, VPORT_CREATE) < 0)
+        return -1;
+
+    virFileWaitForDevices();
+    return 0;
+}
+
+static int
+deleteVport(virStoragePoolSourceAdapter adapter)
+{
+    unsigned int parent_host;
+
+    if (adapter.type != VIR_STORAGE_POOL_SOURCE_ADAPTER_TYPE_FC_HOST)
+        return 0;
+
+    if (!(virGetFCHostNameByWWN(NULL, adapter.data.fchost.wwnn,
+                                adapter.data.fchost.wwpn)))
+        return -1;
+
+    if (getHostNumber(adapter.data.fchost.parent, &parent_host) < 0)
+        return -1;
+
+    if (virManageVport(parent_host, adapter.data.fchost.wwnn,
+                       adapter.data.fchost.wwpn, VPORT_DELETE) < 0)
+        return -1;
+
+    return 0;
+}
+
+
 static int
 virStorageBackendSCSICheckPool(virConnectPtr conn ATTRIBUTE_UNUSED,
                                virStoragePoolObjPtr pool,
@@ -706,10 +762,27 @@ out:
     return ret;
 }
 
+static int
+virStorageBackendSCSIStartPool(virConnectPtr conn ATTRIBUTE_UNUSED,
+                               virStoragePoolObjPtr pool)
+{
+    virStoragePoolSourceAdapter adapter = pool->def->source.adapter;
+    return createVport(adapter);
+}
+
+static int
+virStorageBackendSCSIStopPool(virConnectPtr conn ATTRIBUTE_UNUSED,
+                              virStoragePoolObjPtr pool)
+{
+    virStoragePoolSourceAdapter adapter = pool->def->source.adapter;
+    return deleteVport(adapter);
+}
 
 virStorageBackend virStorageBackendSCSI = {
     .type = VIR_STORAGE_POOL_SCSI,
 
     .checkPool = virStorageBackendSCSICheckPool,
     .refreshPool = virStorageBackendSCSIRefreshPool,
+    .startPool = virStorageBackendSCSIStartPool,
+    .stopPool = virStorageBackendSCSIStopPool,
 };