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/* $OpenBSD: rf_raid4.c,v 1.4 2002/12/16 07:01:04 tdeval Exp $ */
/* $NetBSD: rf_raid4.c,v 1.4 2000/01/07 03:41:02 oster Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Rachad Youssef
*
* 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 Software.Distribution@CS.CMU.EDU
* 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_raid4.c -- Implements RAID Level 4.
*
*****************************************/
#include "rf_raid.h"
#include "rf_dag.h"
#include "rf_dagutils.h"
#include "rf_dagfuncs.h"
#include "rf_dagffrd.h"
#include "rf_dagffwr.h"
#include "rf_dagdegrd.h"
#include "rf_dagdegwr.h"
#include "rf_raid4.h"
#include "rf_general.h"
typedef struct RF_Raid4ConfigInfo_s {
RF_RowCol_t *stripeIdentifier; /*
* Filled in at config time & used by
* IdentifyStripe.
*/
} RF_Raid4ConfigInfo_t;
int
rf_ConfigureRAID4(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
RF_Config_t *cfgPtr)
{
RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
RF_Raid4ConfigInfo_t *info;
int i;
/* Create a RAID level 4 configuration structure... */
RF_MallocAndAdd(info, sizeof(RF_Raid4ConfigInfo_t),
(RF_Raid4ConfigInfo_t *), raidPtr->cleanupList);
if (info == NULL)
return (ENOMEM);
layoutPtr->layoutSpecificInfo = (void *) info;
/* ... and fill it in. */
RF_MallocAndAdd(info->stripeIdentifier, raidPtr->numCol *
sizeof(RF_RowCol_t), (RF_RowCol_t *), raidPtr->cleanupList);
if (info->stripeIdentifier == NULL)
return (ENOMEM);
for (i = 0; i < raidPtr->numCol; i++)
info->stripeIdentifier[i] = i;
RF_ASSERT(raidPtr->numRow == 1);
/* Fill in the remaining layout parameters. */
layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit <<
raidPtr->logBytesPerSector;
layoutPtr->numDataCol = raidPtr->numCol - 1;
layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol *
layoutPtr->sectorsPerStripeUnit;
layoutPtr->numParityCol = 1;
raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk *
layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
return (0);
}
int
rf_GetDefaultNumFloatingReconBuffersRAID4(RF_Raid_t *raidPtr)
{
return (20);
}
RF_HeadSepLimit_t
rf_GetDefaultHeadSepLimitRAID4(RF_Raid_t *raidPtr)
{
return (20);
}
void
rf_MapSectorRAID4(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
{
RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
*row = 0;
*col = SUID % raidPtr->Layout.numDataCol;
*diskSector = (SUID / (raidPtr->Layout.numDataCol)) *
raidPtr->Layout.sectorsPerStripeUnit +
(raidSector % raidPtr->Layout.sectorsPerStripeUnit);
}
void
rf_MapParityRAID4(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
{
RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
*row = 0;
*col = raidPtr->Layout.numDataCol;
*diskSector = (SUID / (raidPtr->Layout.numDataCol)) *
raidPtr->Layout.sectorsPerStripeUnit +
(raidSector % raidPtr->Layout.sectorsPerStripeUnit);
}
void
rf_IdentifyStripeRAID4(RF_Raid_t *raidPtr, RF_RaidAddr_t addr,
RF_RowCol_t **diskids, RF_RowCol_t *outRow)
{
RF_Raid4ConfigInfo_t *info = raidPtr->Layout.layoutSpecificInfo;
*outRow = 0;
*diskids = info->stripeIdentifier;
}
void
rf_MapSIDToPSIDRAID4(RF_RaidLayout_t *layoutPtr, RF_StripeNum_t stripeID,
RF_StripeNum_t *psID, RF_ReconUnitNum_t *which_ru)
{
*which_ru = 0;
*psID = stripeID;
}
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