160 lines
4.4 KiB
C
160 lines
4.4 KiB
C
/* $NetBSD: rf_raid4.c,v 1.5 2001/11/13 07:11:16 lukem Exp $ */
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/*
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* Copyright (c) 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Rachad Youssef
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/***************************************
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*
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* rf_raid4.c -- implements RAID Level 4
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*
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***************************************/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: rf_raid4.c,v 1.5 2001/11/13 07:11:16 lukem Exp $");
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#include "rf_raid.h"
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#include "rf_dag.h"
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#include "rf_dagutils.h"
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#include "rf_dagfuncs.h"
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#include "rf_dagffrd.h"
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#include "rf_dagffwr.h"
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#include "rf_dagdegrd.h"
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#include "rf_dagdegwr.h"
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#include "rf_raid4.h"
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#include "rf_general.h"
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typedef struct RF_Raid4ConfigInfo_s {
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RF_RowCol_t *stripeIdentifier; /* filled in at config time & used by
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* IdentifyStripe */
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} RF_Raid4ConfigInfo_t;
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int
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rf_ConfigureRAID4(
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RF_ShutdownList_t ** listp,
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RF_Raid_t * raidPtr,
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RF_Config_t * cfgPtr)
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{
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RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
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RF_Raid4ConfigInfo_t *info;
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int i;
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/* create a RAID level 4 configuration structure ... */
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RF_MallocAndAdd(info, sizeof(RF_Raid4ConfigInfo_t), (RF_Raid4ConfigInfo_t *), raidPtr->cleanupList);
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if (info == NULL)
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return (ENOMEM);
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layoutPtr->layoutSpecificInfo = (void *) info;
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/* ... and fill it in. */
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RF_MallocAndAdd(info->stripeIdentifier, raidPtr->numCol * sizeof(RF_RowCol_t), (RF_RowCol_t *), raidPtr->cleanupList);
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if (info->stripeIdentifier == NULL)
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return (ENOMEM);
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for (i = 0; i < raidPtr->numCol; i++)
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info->stripeIdentifier[i] = i;
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RF_ASSERT(raidPtr->numRow == 1);
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/* fill in the remaining layout parameters */
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layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
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layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector;
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layoutPtr->numDataCol = raidPtr->numCol - 1;
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layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
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layoutPtr->numParityCol = 1;
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raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
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return (0);
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}
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int
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rf_GetDefaultNumFloatingReconBuffersRAID4(RF_Raid_t * raidPtr)
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{
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return (20);
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}
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RF_HeadSepLimit_t
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rf_GetDefaultHeadSepLimitRAID4(RF_Raid_t * raidPtr)
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{
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return (20);
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}
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void
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rf_MapSectorRAID4(
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RF_Raid_t * raidPtr,
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RF_RaidAddr_t raidSector,
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RF_RowCol_t * row,
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RF_RowCol_t * col,
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RF_SectorNum_t * diskSector,
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int remap)
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{
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RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
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*row = 0;
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*col = SUID % raidPtr->Layout.numDataCol;
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*diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit +
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(raidSector % raidPtr->Layout.sectorsPerStripeUnit);
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}
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void
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rf_MapParityRAID4(
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RF_Raid_t * raidPtr,
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RF_RaidAddr_t raidSector,
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RF_RowCol_t * row,
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RF_RowCol_t * col,
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RF_SectorNum_t * diskSector,
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int remap)
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{
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RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
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*row = 0;
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*col = raidPtr->Layout.numDataCol;
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*diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit +
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(raidSector % raidPtr->Layout.sectorsPerStripeUnit);
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}
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void
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rf_IdentifyStripeRAID4(
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RF_Raid_t * raidPtr,
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RF_RaidAddr_t addr,
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RF_RowCol_t ** diskids,
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RF_RowCol_t * outRow)
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{
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RF_Raid4ConfigInfo_t *info = raidPtr->Layout.layoutSpecificInfo;
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*outRow = 0;
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*diskids = info->stripeIdentifier;
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}
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void
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rf_MapSIDToPSIDRAID4(
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RF_RaidLayout_t * layoutPtr,
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RF_StripeNum_t stripeID,
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RF_StripeNum_t * psID,
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RF_ReconUnitNum_t * which_ru)
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{
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*which_ru = 0;
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*psID = stripeID;
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}
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