/* $NetBSD: rf_raid0.c,v 1.16 2019/02/09 03:34:00 christos Exp $ */

/* $NetBSD: rf_raid0.c,v 1.16 2019/02/09 03:34:00 christos Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Mark Holland
*
* 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.
*/

/***************************************
*
* rf_raid0.c -- implements RAID Level 0
*
***************************************/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rf_raid0.c,v 1.16 2019/02/09 03:34:00 christos Exp $");

#include <dev/raidframe/raidframevar.h>

#include "rf_raid.h"
#include "rf_raid0.h"
#include "rf_dag.h"
#include "rf_dagffrd.h"
#include "rf_dagffwr.h"
#include "rf_dagutils.h"
#include "rf_dagfuncs.h"
#include "rf_general.h"
#include "rf_parityscan.h"

typedef struct RF_Raid0ConfigInfo_s {
RF_RowCol_t *stripeIdentifier;
} RF_Raid0ConfigInfo_t;

int
rf_ConfigureRAID0(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
RF_Config_t *cfgPtr)
{
RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
RF_Raid0ConfigInfo_t *info;
RF_RowCol_t i;

/* create a RAID level 0 configuration structure */
info = RF_MallocAndAdd(sizeof(*info), raidPtr->cleanupList);
if (info == NULL)
return (ENOMEM);
layoutPtr->layoutSpecificInfo = (void *) info;

info->stripeIdentifier = RF_MallocAndAdd(raidPtr->numCol
* sizeof(*info->stripeIdentifier), raidPtr->cleanupList);
if (info->stripeIdentifier == NULL)
return (ENOMEM);
for (i = 0; i < raidPtr->numCol; i++)
info->stripeIdentifier[i] = i;

raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
layoutPtr->dataSectorsPerStripe = raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
layoutPtr->numDataCol = raidPtr->numCol;
layoutPtr->numParityCol = 0;
return (0);
}

void
rf_MapSectorRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
{
RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
*col = SUID % raidPtr->numCol;
*diskSector = (SUID / raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit +
(raidSector % raidPtr->Layout.sectorsPerStripeUnit);
}

void
rf_MapParityRAID0(RF_Raid_t *raidPtr,
RF_RaidAddr_t raidSector, RF_RowCol_t *col,
RF_SectorNum_t *diskSector, int remap)
{
*col = 0;
*diskSector = 0;
}

void
rf_IdentifyStripeRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t addr,
RF_RowCol_t **diskids)
{
RF_Raid0ConfigInfo_t *info;

info = raidPtr->Layout.layoutSpecificInfo;
*diskids = info->stripeIdentifier;
}

void
rf_MapSIDToPSIDRAID0(RF_RaidLayout_t *layoutPtr,
RF_StripeNum_t stripeID, RF_StripeNum_t *psID, RF_ReconUnitNum_t *which_ru)
{
*which_ru = 0;
*psID = stripeID;
}

void
rf_RAID0DagSelect(
RF_Raid_t * raidPtr,
RF_IoType_t type,
RF_AccessStripeMap_t * asmap,
RF_VoidFuncPtr * createFunc)
{
if (raidPtr->numFailures > 0) {
*createFunc = NULL;
return;
}
*createFunc = ((type == RF_IO_TYPE_READ) ?
(RF_VoidFuncPtr) rf_CreateFaultFreeReadDAG : (RF_VoidFuncPtr) rf_CreateRAID0WriteDAG);
}

int
rf_VerifyParityRAID0(RF_Raid_t *raidPtr,
RF_RaidAddr_t raidAddr, RF_PhysDiskAddr_t *parityPDA,
int correct_it, RF_RaidAccessFlags_t flags)
{
/*
* No parity is always okay.
*/
return (RF_PARITY_OKAY);
}