189 lines
5.8 KiB
C
189 lines
5.8 KiB
C
/* $NetBSD: rf_evenodd_dags.c,v 1.2 1999/02/05 00:06:11 oster Exp $ */
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/*
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* rf_evenodd_dags.c
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*/
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/*
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* Copyright (c) 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chang-Ming Wu
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#include "rf_archs.h"
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#if RF_INCLUDE_EVENODD > 0
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#include "rf_types.h"
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#include "rf_raid.h"
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#include "rf_dag.h"
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#include "rf_dagfuncs.h"
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#include "rf_dagutils.h"
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#include "rf_etimer.h"
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#include "rf_acctrace.h"
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#include "rf_general.h"
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#include "rf_evenodd_dags.h"
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#include "rf_evenodd.h"
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#include "rf_evenodd_dagfuncs.h"
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#include "rf_pq.h"
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#include "rf_dagdegrd.h"
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#include "rf_dagdegwr.h"
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#include "rf_dagffwr.h"
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/*
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* Lost one data.
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* Use P to reconstruct missing data.
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*/
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RF_CREATE_DAG_FUNC_DECL(rf_EO_100_CreateReadDAG)
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{
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rf_CreateDegradedReadDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_eoPRecoveryFuncs);
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}
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/*
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* Lost data + E.
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* Use P to reconstruct missing data.
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*/
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RF_CREATE_DAG_FUNC_DECL(rf_EO_101_CreateReadDAG)
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{
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rf_CreateDegradedReadDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_eoPRecoveryFuncs);
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}
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/*
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* Lost data + P.
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* Make E look like P, and use Eor for Xor, and we can
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* use degraded read DAG.
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*/
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RF_CREATE_DAG_FUNC_DECL(rf_EO_110_CreateReadDAG)
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{
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RF_PhysDiskAddr_t *temp;
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/* swap P and E pointers to fake out the DegradedReadDAG code */
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temp = asmap->parityInfo;
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asmap->parityInfo = asmap->qInfo;
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asmap->qInfo = temp;
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rf_CreateDegradedReadDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_eoERecoveryFuncs);
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}
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/*
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* Lost two data.
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*/
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RF_CREATE_DAG_FUNC_DECL(rf_EOCreateDoubleDegradedReadDAG)
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{
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rf_EO_DoubleDegRead(raidPtr, asmap, dag_h, bp, flags, allocList);
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}
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/*
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* Lost two data.
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*/
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RF_CREATE_DAG_FUNC_DECL(rf_EO_200_CreateReadDAG)
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{
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rf_EOCreateDoubleDegradedReadDAG(raidPtr, asmap, dag_h, bp, flags, allocList);
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}
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RF_CREATE_DAG_FUNC_DECL(rf_EO_100_CreateWriteDAG)
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{
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if (asmap->numStripeUnitsAccessed != 1 &&
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asmap->failedPDAs[0]->numSector != raidPtr->Layout.sectorsPerStripeUnit)
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RF_PANIC();
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rf_CommonCreateSimpleDegradedWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 2, (int (*) (RF_DagNode_t *)) rf_Degraded_100_EOFunc, RF_TRUE);
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}
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/*
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* E is dead. Small write.
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*/
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RF_CREATE_DAG_FUNC_DECL(rf_EO_001_CreateSmallWriteDAG)
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{
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rf_CommonCreateSmallWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_EOSmallWritePFuncs, NULL);
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}
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/*
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* E is dead. Large write.
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*/
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RF_CREATE_DAG_FUNC_DECL(rf_EO_001_CreateLargeWriteDAG)
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{
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rf_CommonCreateLargeWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 1, rf_RegularPFunc, RF_TRUE);
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}
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/*
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* P is dead. Small write.
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* Swap E + P, use single-degraded stuff.
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*/
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RF_CREATE_DAG_FUNC_DECL(rf_EO_010_CreateSmallWriteDAG)
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{
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RF_PhysDiskAddr_t *temp;
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/* swap P and E pointers to fake out the DegradedReadDAG code */
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temp = asmap->parityInfo;
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asmap->parityInfo = asmap->qInfo;
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asmap->qInfo = temp;
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rf_CommonCreateSmallWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_EOSmallWriteEFuncs, NULL);
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}
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/*
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* P is dead. Large write.
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* Swap E + P, use single-degraded stuff.
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*/
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RF_CREATE_DAG_FUNC_DECL(rf_EO_010_CreateLargeWriteDAG)
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{
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RF_PhysDiskAddr_t *temp;
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/* swap P and E pointers to fake out the code */
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temp = asmap->parityInfo;
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asmap->parityInfo = asmap->qInfo;
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asmap->qInfo = temp;
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rf_CommonCreateLargeWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 1, rf_RegularEFunc, RF_FALSE);
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}
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RF_CREATE_DAG_FUNC_DECL(rf_EO_011_CreateWriteDAG)
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{
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rf_CreateNonRedundantWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList,
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RF_IO_TYPE_WRITE);
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}
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RF_CREATE_DAG_FUNC_DECL(rf_EO_110_CreateWriteDAG)
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{
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RF_PhysDiskAddr_t *temp;
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if (asmap->numStripeUnitsAccessed != 1 &&
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asmap->failedPDAs[0]->numSector != raidPtr->Layout.sectorsPerStripeUnit) {
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RF_PANIC();
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}
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/* swap P and E to fake out parity code */
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temp = asmap->parityInfo;
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asmap->parityInfo = asmap->qInfo;
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asmap->qInfo = temp;
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rf_CommonCreateSimpleDegradedWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 1, (int (*) (RF_DagNode_t *)) rf_EO_DegradedWriteEFunc, RF_FALSE);
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/* is the regular E func the right one to call? */
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}
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RF_CREATE_DAG_FUNC_DECL(rf_EO_101_CreateWriteDAG)
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{
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if (asmap->numStripeUnitsAccessed != 1 &&
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asmap->failedPDAs[0]->numSector != raidPtr->Layout.sectorsPerStripeUnit)
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RF_PANIC();
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rf_CommonCreateSimpleDegradedWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 1, rf_RecoveryXorFunc, RF_TRUE);
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}
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RF_CREATE_DAG_FUNC_DECL(rf_EO_DoubleDegRead)
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{
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rf_DoubleDegRead(raidPtr, asmap, dag_h, bp, flags, allocList,
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"Re", "EvenOddRecovery", rf_EvenOddDoubleRecoveryFunc);
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}
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RF_CREATE_DAG_FUNC_DECL(rf_EOCreateSmallWriteDAG)
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{
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rf_CommonCreateSmallWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_pFuncs, &rf_EOSmallWriteEFuncs);
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}
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RF_CREATE_DAG_FUNC_DECL(rf_EOCreateLargeWriteDAG)
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{
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rf_CommonCreateLargeWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 2, rf_RegularPEFunc, RF_FALSE);
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}
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RF_CREATE_DAG_FUNC_DECL(rf_EO_200_CreateWriteDAG)
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{
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rf_DoubleDegSmallWrite(raidPtr, asmap, dag_h, bp, flags, allocList, "Re", "We", "EOWrDDRecovery", rf_EOWriteDoubleRecoveryFunc);
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}
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#endif /* RF_INCLUDE_EVENODD > 0 */
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