158 lines
4.3 KiB
C
158 lines
4.3 KiB
C
/* $NetBSD: rf_raid4.c,v 1.3 1999/02/05 00:06:16 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_threadid.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;
|
|
}
|