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/* $FreeBSD$ */
/* $NetBSD: rf_raid0.c,v 1.4 2000/01/07 03:41:02 oster 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 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_raid0.c -- implements RAID Level 0
*
***************************************/
#include <dev/raidframe/rf_types.h>
#include <dev/raidframe/rf_raid.h>
#include <dev/raidframe/rf_raid0.h>
#include <dev/raidframe/rf_dag.h>
#include <dev/raidframe/rf_dagffrd.h>
#include <dev/raidframe/rf_dagffwr.h>
#include <dev/raidframe/rf_dagutils.h>
#include <dev/raidframe/rf_dagfuncs.h>
#include <dev/raidframe/rf_general.h>
#include <dev/raidframe/rf_configure.h>
#include <dev/raidframe/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 */
RF_MallocAndAdd(info, sizeof(RF_Raid0ConfigInfo_t), (RF_Raid0ConfigInfo_t *), raidPtr->cleanupList);
if (info == NULL)
return (ENOMEM);
layoutPtr->layoutSpecificInfo = (void *) info;
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);
raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
layoutPtr->dataSectorsPerStripe = raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector;
layoutPtr->numDataCol = raidPtr->numCol;
layoutPtr->numParityCol = 0;
return (0);
}
void
rf_MapSectorRAID0(
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->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 * row,
RF_RowCol_t * col,
RF_SectorNum_t * diskSector,
int remap)
{
*row = *col = 0;
*diskSector = 0;
}
void
rf_IdentifyStripeRAID0(
RF_Raid_t * raidPtr,
RF_RaidAddr_t addr,
RF_RowCol_t ** diskids,
RF_RowCol_t * outRow)
{
RF_Raid0ConfigInfo_t *info;
info = raidPtr->Layout.layoutSpecificInfo;
*diskids = info->stripeIdentifier;
*outRow = 0;
}
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)
{
*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);
}
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