bool run(OperationContext* txn,
             const string& dbname,
             BSONObj& cmdObj,
             int options,
             string& errmsg,
             BSONObjBuilder& result) {
        const bool ok = grid.catalogManager(txn)->runUserManagementWriteCommand(
            txn, this->name, dbname, cmdObj, &result);

        AuthorizationManager* authzManager = getGlobalAuthorizationManager();
        invariant(authzManager);
        authzManager->invalidateUsersFromDB(dbname);

        return ok;
    }
        bool run(const string& dbname,
                 BSONObj& cmdObj,
                 int options,
                 string& errmsg,
                 BSONObjBuilder& result,
                 bool fromRepl) {
            AuthorizationManager* authzManager = getGlobalAuthorizationManager();
            AuthzDocumentsUpdateGuard updateGuard(authzManager);
            if (!updateGuard.tryLock("Remove all users from database")) {
                addStatus(Status(ErrorCodes::LockBusy, "Could not lock auth data update lock."),
                          result);
                return false;
            }

            BSONObj writeConcern;
            Status status = auth::parseAndValidateRemoveUsersFromDatabaseCommand(cmdObj,
                                                                                 dbname,
                                                                                 &writeConcern);
            if (!status.isOK()) {
                addStatus(status, result);
                return false;
            }

            int numRemoved;
            status = authzManager->removePrivilegeDocuments(
                    BSON(AuthorizationManager::USER_SOURCE_FIELD_NAME << dbname),
                    writeConcern,
                    &numRemoved);
            // Must invalidate even on bad status - what if the write succeeded but the GLE failed?
            authzManager->invalidateUsersFromDB(dbname);
            if (!status.isOK()) {
                addStatus(status, result);
                return false;
            }

            result.append("n", numRemoved);
            return true;
        }