161 lines
4.3 KiB
C
161 lines
4.3 KiB
C
/* $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 "rf_types.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_configure.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 */
|
|
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);
|
|
}
|