iSCSI - E.1. 일반 데이터 구조 및 절차 설명

E.1. General Data Structure and Procedure Description

E.1. 일반 데이터 구조 및 절차 설명

This section defines the procedures and data structures that are commonly used by all the error recovery algorithms.

이 섹션에서는 모든 오류 복구 알고리즘에서 공통적으로 사용되는 절차 및 데이터 구조를 정의합니다.

The structures may not be the exhaustive representations of what is required for a typical implementation.

구조는 일반적인 구현에 필요한 사항을 철저하게 표현하지 못할 수도 있습니다.

Data structure definitions -
   struct TransferContext {
           int TargetTransferTag;
           int ExpectedDataSN;
   };

   struct TCB {              /* task control block */
           Boolean SoFarInOrder;
           int ExpectedDataSN; /* used for both R2Ts, and Data */
           int MissingDataSNList[MaxMissingDPDU];

           Boolean FbitReceived;
           Boolean StatusXferd;
           Boolean CurrentlyAllegiant;
           int ActiveR2Ts;
           int Response;
           char *Reason;

           struct TransferContext
                       TransferContextList[MaxOutStandingR2T];
           int InitiatorTaskTag;
           int CmdSN;

           int SNACK_Tag;

   };

   struct Connection {
           struct Session SessionReference;
           Boolean SoFarInOrder;
           int CID;
           int State;

           int CurrentTimeout;
           int ExpectedStatSN;
           int MissingStatSNList[MaxMissingSPDU];
           Boolean PerformConnectionCleanup;
   };

   struct Session {
           int NumConnections;
           int CmdSN;
           int Maxconnections;
           int ErrorRecoveryLevel;
           struct iSCSIEndpoint OtherEndInfo;
           struct Connection ConnectionList[MaxSupportedConns];
   };

   Procedure descriptions -
   Receive-a-In-PDU(transport connection, inbound PDU);
   check-basic-validity(inbound PDU);
   Start-Timer(timeout handler, argument, timeout value);
   Build-And-Send-Reject(transport connection, bad PDU, reason code);