/* $NetBSD: rf_evenodd_dags.c,v 1.5 2019/10/10 03:43:59 christos Exp $ */
/*
* rf_evenodd_dags.c
*/
/*
* Copyright (c) 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chang-Ming Wu
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or
[email protected]
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rf_evenodd_dags.c,v 1.5 2019/10/10 03:43:59 christos Exp $");
#include "rf_archs.h"
#if RF_INCLUDE_EVENODD > 0
#include <dev/raidframe/raidframevar.h>
#include "rf_raid.h"
#include "rf_dag.h"
#include "rf_dagfuncs.h"
#include "rf_dagutils.h"
#include "rf_etimer.h"
#include "rf_acctrace.h"
#include "rf_general.h"
#include "rf_evenodd_dags.h"
#include "rf_evenodd.h"
#include "rf_evenodd_dagfuncs.h"
#include "rf_pq.h"
#include "rf_dagdegrd.h"
#include "rf_dagdegwr.h"
#include "rf_dagffwr.h"
/*
* Lost one data.
* Use P to reconstruct missing data.
*/
RF_CREATE_DAG_FUNC_DECL(rf_EO_100_CreateReadDAG)
{
rf_CreateDegradedReadDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_eoPRecoveryFuncs);
}
/*
* Lost data + E.
* Use P to reconstruct missing data.
*/
RF_CREATE_DAG_FUNC_DECL(rf_EO_101_CreateReadDAG)
{
rf_CreateDegradedReadDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_eoPRecoveryFuncs);
}
/*
* Lost data + P.
* Make E look like P, and use Eor for Xor, and we can
* use degraded read DAG.
*/
RF_CREATE_DAG_FUNC_DECL(rf_EO_110_CreateReadDAG)
{
RF_PhysDiskAddr_t *temp;
/* swap P and E pointers to fake out the DegradedReadDAG code */
temp = asmap->parityInfo;
asmap->parityInfo = asmap->qInfo;
asmap->qInfo = temp;
rf_CreateDegradedReadDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_eoERecoveryFuncs);
}
/*
* Lost two data.
*/
RF_CREATE_DAG_FUNC_DECL(rf_EOCreateDoubleDegradedReadDAG)
{
rf_EO_DoubleDegRead(raidPtr, asmap, dag_h, bp, flags, allocList);
}
/*
* Lost two data.
*/
RF_CREATE_DAG_FUNC_DECL(rf_EO_200_CreateReadDAG)
{
rf_EOCreateDoubleDegradedReadDAG(raidPtr, asmap, dag_h, bp, flags, allocList);
}
RF_CREATE_DAG_FUNC_DECL(rf_EO_100_CreateWriteDAG)
{
if (asmap->numStripeUnitsAccessed != 1 &&
asmap->failedPDAs[0]->numSector != raidPtr->Layout.sectorsPerStripeUnit)
RF_PANIC();
rf_CommonCreateSimpleDegradedWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 2, rf_Degraded_100_EOFunc, RF_TRUE);
}
/*
* E is dead. Small write.
*/
RF_CREATE_DAG_FUNC_DECL(rf_EO_001_CreateSmallWriteDAG)
{
rf_CommonCreateSmallWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_EOSmallWritePFuncs, NULL);
}
/*
* E is dead. Large write.
*/
RF_CREATE_DAG_FUNC_DECL(rf_EO_001_CreateLargeWriteDAG)
{
rf_CommonCreateLargeWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 1, rf_RegularPFunc, RF_TRUE);
}
/*
* P is dead. Small write.
* Swap E + P, use single-degraded stuff.
*/
RF_CREATE_DAG_FUNC_DECL(rf_EO_010_CreateSmallWriteDAG)
{
RF_PhysDiskAddr_t *temp;
/* swap P and E pointers to fake out the DegradedReadDAG code */
temp = asmap->parityInfo;
asmap->parityInfo = asmap->qInfo;
asmap->qInfo = temp;
rf_CommonCreateSmallWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_EOSmallWriteEFuncs, NULL);
}
/*
* P is dead. Large write.
* Swap E + P, use single-degraded stuff.
*/
RF_CREATE_DAG_FUNC_DECL(rf_EO_010_CreateLargeWriteDAG)
{
RF_PhysDiskAddr_t *temp;
/* swap P and E pointers to fake out the code */
temp = asmap->parityInfo;
asmap->parityInfo = asmap->qInfo;
asmap->qInfo = temp;
rf_CommonCreateLargeWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 1, rf_RegularEFunc, RF_FALSE);
}
RF_CREATE_DAG_FUNC_DECL(rf_EO_011_CreateWriteDAG)
{
rf_CreateNonRedundantWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList,
RF_IO_TYPE_WRITE);
}
RF_CREATE_DAG_FUNC_DECL(rf_EO_110_CreateWriteDAG)
{
RF_PhysDiskAddr_t *temp;
if (asmap->numStripeUnitsAccessed != 1 &&
asmap->failedPDAs[0]->numSector != raidPtr->Layout.sectorsPerStripeUnit) {
RF_PANIC();
}
/* swap P and E to fake out parity code */
temp = asmap->parityInfo;
asmap->parityInfo = asmap->qInfo;
asmap->qInfo = temp;
rf_CommonCreateSimpleDegradedWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 1, rf_EO_DegradedWriteEFunc, RF_FALSE);
/* is the regular E func the right one to call? */
}
RF_CREATE_DAG_FUNC_DECL(rf_EO_101_CreateWriteDAG)
{
if (asmap->numStripeUnitsAccessed != 1 &&
asmap->failedPDAs[0]->numSector != raidPtr->Layout.sectorsPerStripeUnit)
RF_PANIC();
rf_CommonCreateSimpleDegradedWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 1, rf_RecoveryXorFunc, RF_TRUE);
}
RF_CREATE_DAG_FUNC_DECL(rf_EO_DoubleDegRead)
{
rf_DoubleDegRead(raidPtr, asmap, dag_h, bp, flags, allocList,
"Re", "EvenOddRecovery", rf_EvenOddDoubleRecoveryFunc);
}
RF_CREATE_DAG_FUNC_DECL(rf_EOCreateSmallWriteDAG)
{
rf_CommonCreateSmallWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_pFuncs, &rf_EOSmallWriteEFuncs);
}
RF_CREATE_DAG_FUNC_DECL(rf_EOCreateLargeWriteDAG)
{
rf_CommonCreateLargeWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 2, rf_RegularPEFunc, RF_FALSE);
}
RF_CREATE_DAG_FUNC_DECL(rf_EO_200_CreateWriteDAG)
{
rf_DoubleDegSmallWrite(raidPtr, asmap, dag_h, bp, flags, allocList, "Re", "We", "EOWrDDRecovery", rf_EOWriteDoubleRecoveryFunc);
}
#endif /* RF_INCLUDE_EVENODD > 0 */
