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/* $OpenBSD: rf_raid5_rotatedspare.c,v 1.3 2000/01/11 18:02:23 peter Exp $ */
/* $NetBSD: rf_raid5_rotatedspare.c,v 1.4 2000/01/07 03:41:03 oster Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Khalil Amiri
*
* 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_raid5_rotated_spare.c -- implements RAID Level 5 with rotated sparing
*
**************************************************************************/
#include "rf_raid.h"
#include "rf_raid5.h"
#include "rf_dag.h"
#include "rf_dagutils.h"
#include "rf_dagfuncs.h"
#include "rf_general.h"
#include "rf_utils.h"
#include "rf_raid5_rotatedspare.h"
typedef struct RF_Raid5RSConfigInfo_s {
RF_RowCol_t **stripeIdentifier; /* filled in at config time & used by
* IdentifyStripe */
} RF_Raid5RSConfigInfo_t;
int
rf_ConfigureRAID5_RS(
RF_ShutdownList_t ** listp,
RF_Raid_t * raidPtr,
RF_Config_t * cfgPtr)
{
RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
RF_Raid5RSConfigInfo_t *info;
RF_RowCol_t i, j, startdisk;
/* create a RAID level 5 configuration structure */
RF_MallocAndAdd(info, sizeof(RF_Raid5RSConfigInfo_t), (RF_Raid5RSConfigInfo_t *), raidPtr->cleanupList);
if (info == NULL)
return (ENOMEM);
layoutPtr->layoutSpecificInfo = (void *) info;
RF_ASSERT(raidPtr->numRow == 1);
RF_ASSERT(raidPtr->numCol >= 3);
/* the stripe identifier must identify the disks in each stripe, IN
* THE ORDER THAT THEY APPEAR IN THE STRIPE. */
info->stripeIdentifier = rf_make_2d_array(raidPtr->numCol, raidPtr->numCol, raidPtr->cleanupList);
if (info->stripeIdentifier == NULL)
return (ENOMEM);
startdisk = 0;
for (i = 0; i < raidPtr->numCol; i++) {
for (j = 0; j < raidPtr->numCol; j++) {
info->stripeIdentifier[i][j] = (startdisk + j) % raidPtr->numCol;
}
if ((--startdisk) < 0)
startdisk = raidPtr->numCol - 1;
}
/* fill in the remaining layout parameters */
layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector;
layoutPtr->numDataCol = raidPtr->numCol - 2;
layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
layoutPtr->numParityCol = 1;
layoutPtr->dataStripeUnitsPerDisk = layoutPtr->stripeUnitsPerDisk;
raidPtr->sectorsPerDisk = layoutPtr->stripeUnitsPerDisk * layoutPtr->sectorsPerStripeUnit;
raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
return (0);
}
RF_ReconUnitCount_t
rf_GetNumSpareRUsRAID5_RS(raidPtr)
RF_Raid_t *raidPtr;
{
return (raidPtr->Layout.stripeUnitsPerDisk / raidPtr->numCol);
}
void
rf_MapSectorRAID5_RS(
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;
if (remap) {
*col = raidPtr->numCol - 1 - (1 + SUID / raidPtr->Layout.numDataCol) % raidPtr->numCol;
*col = (*col + 1) % raidPtr->numCol; /* spare unit is rotated
* with parity; line
* above maps to parity */
} else {
*col = (SUID + (SUID / raidPtr->Layout.numDataCol)) % raidPtr->numCol;
}
*diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit +
(raidSector % raidPtr->Layout.sectorsPerStripeUnit);
}
void
rf_MapParityRAID5_RS(
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->numCol - 1 - (1 + SUID / raidPtr->Layout.numDataCol) % raidPtr->numCol;
*diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit +
(raidSector % raidPtr->Layout.sectorsPerStripeUnit);
if (remap)
*col = (*col + 1) % raidPtr->numCol;
}
void
rf_IdentifyStripeRAID5_RS(
RF_Raid_t * raidPtr,
RF_RaidAddr_t addr,
RF_RowCol_t ** diskids,
RF_RowCol_t * outRow)
{
RF_StripeNum_t stripeID = rf_RaidAddressToStripeID(&raidPtr->Layout, addr);
RF_Raid5RSConfigInfo_t *info = (RF_Raid5RSConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
*outRow = 0;
*diskids = info->stripeIdentifier[stripeID % raidPtr->numCol];
}
void
rf_MapSIDToPSIDRAID5_RS(
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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