iSCSI - E.4.2. 개시자 알고리즘

E.4.2. Initiator Algorithms
E.4.2. 이니시에이터 알고리즘
Receive-a-In-PDU(Connection, CurrentPDU) {
           check-basic-validity(CurrentPDU);
           if (Header-Digest-Bad) discard, return;

           Retrieve TCB from CurrentPDU.InitiatorTaskTag.
           if (CurrentPDU.type == Async) {
               if (CurrentPDU.AsyncEvent == ConnectionDropped) {
                  Retrieve the AffectedConnection for
         CurrentPDU.Parameter1.
                  AffectedConnection.CurrentTimeout =
         CurrentPDU.Parameter3;
                  AffectedConnection.State = CLEANUP_WAIT;
                  Start-Timer(Connection-Cleanup-Handler,
                               AffectedConnection,
         CurrentPDU.Parameter2);
               } else if (CurrentPDU.AsyncEvent == LogoutRequest)) {
                 AffectedConnection = Connection;
                 AffectedConnection.State = LOGOUT_REQUESTED;
                 AffectedConnection.PerformConnectionCleanup = TRUE;
                 AffectedConnection.CurrentTimeout =
         CurrentPDU.Parameter3;
                 Start-Timer(Connection-Cleanup-Handler,
                               AffectedConnection, 0);
               } else if (CurrentPDU.AsyncEvent == SessionDropped)) {
                 for (each Connection) {
                     Connection.State = CLEANUP_WAIT;
                     Connection.CurrentTimeout = CurrentPDU.Parameter3;
                     Start-Timer(Connection-Cleanup-Handler,
                               Connection, CurrentPDU.Parameter2);
                 }
                 Session.state = FAILED;
               }

           } else if (CurrentPDU.type == LogoutResponse) {
               Retrieve the CleanupConnection for CurrentPDU.CID.
               if (CurrentPDU.Response = failure) {
                  CleanupConnection.State = CLEANUP_WAIT;
               } else {
                   CleanupConnection.State = FREE;
               }
           } else if (CurrentPDU.type == LoginResponse) {
                if (this is a response to an implicit Logout) {
                   Retrieve the CleanupConnection.
                   if (successful) {
                       CleanupConnection.State = FREE;
                       Connection.State = LOGGED_IN;
                   } else {
                        CleanupConnection.State = CLEANUP_WAIT;
                        DestroyTransportConnection(Connection);
                   }
                }
           } else { /* REST UNRELATED TO CONNECTION-RECOVERY,

                     * NOT SHOWN */
           }
           if (CleanupConnection.State == FREE) {
              for (each command that was active on CleanupConnection) {
              /* Establish new connection allegiance */
                   NewConnection = Pick-A-Logged-In-Connection(Session);
                   Build-And-Send-Command(NewConnection, TCB);
               }
           } }

         Connection-Cleanup-Handler(Connection) {
           Retrieve Session from Connection.
           if (Connection can still exchange iSCSI PDUs) {
               NewConnection = Connection;
           } else {
               Start-Timer(Connection-Resource-Timeout-Handler,
                     Connection, Connection.CurrentTimeout);
               if (there are other logged-in connections) {
                    NewConnection = Pick-A-Logged-In-
         Connection(Session);
               } else {
                    NewConnection =

                      CreateTransportConnection(Session.OtherEndInfo);
                    Initiate an implicit Logout on NewConnection for
                                                      Connection.CID.
                    return;
               }
           }
           Build-And-Send-Logout(NewConnection, Connection.CID,
                                               RecoveryRemove); }

         Transport_Exception_Handler(Connection) {
           Connection.PerformConnectionCleanup = TRUE;
           if (the event is an unexpected transport disconnect) {
               Connection.State = CLEANUP_WAIT;

               Connection.CurrentTimeout = DefaultTime2Retain;
               Start-Timer(Connection-Cleanup-Handler, Connection,
                                                 DefaultTime2Wait);

           } else {
               Connection.State = FREE;
           } }