Add locking for thread safety to storage driver

ChangeLog

+Thu Dec  4 21:40:41 GMT 2008 Daniel P. Berrange <berrange@redhat.com>
+
+	* src/storage_conf.h: Add driver lock
+	* src/storage_driver.c: Add locking for thread safety
+
 Thu Dec  4 21:39:41 GMT 2008 Daniel P. Berrange <berrange@redhat.com>
 
 	* src/storage_driver.c: Merge all return paths driver storage

src/storage_conf.h

@@ -248,6 +248,8 @@ typedef struct _virStorageDriverState virStorageDriverState;
 typedef virStorageDriverState *virStorageDriverStatePtr;
 
 struct _virStorageDriverState {
+    PTHREAD_MUTEX_T(lock);
+
     virStoragePoolObjList pools;
 
     char *configDir;