288 lines
10 KiB
C
288 lines
10 KiB
C
/* $NetBSD: rf_chaindecluster.c,v 1.3 1999/02/05 00:06:06 oster 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: Khalil Amiri
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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_chaindecluster.c -- implements chained declustering
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*
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*****************************************************************************/
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#include "rf_archs.h"
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#include "rf_types.h"
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#include "rf_raid.h"
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#include "rf_chaindecluster.h"
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#include "rf_dag.h"
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#include "rf_dagutils.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_dagfuncs.h"
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#include "rf_threadid.h"
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#include "rf_general.h"
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#include "rf_utils.h"
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typedef struct RF_ChaindeclusterConfigInfo_s {
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RF_RowCol_t **stripeIdentifier; /* filled in at config time and used
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* by IdentifyStripe */
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RF_StripeCount_t numSparingRegions;
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RF_StripeCount_t stripeUnitsPerSparingRegion;
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RF_SectorNum_t mirrorStripeOffset;
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} RF_ChaindeclusterConfigInfo_t;
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int
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rf_ConfigureChainDecluster(
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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_StripeCount_t num_used_stripeUnitsPerDisk;
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RF_ChaindeclusterConfigInfo_t *info;
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RF_RowCol_t i;
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/* create a Chained Declustering configuration structure */
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RF_MallocAndAdd(info, sizeof(RF_ChaindeclusterConfigInfo_t), (RF_ChaindeclusterConfigInfo_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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/* fill in the config structure. */
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info->stripeIdentifier = rf_make_2d_array(raidPtr->numCol, 2, 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][0] = i % raidPtr->numCol;
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info->stripeIdentifier[i][1] = (i + 1) % raidPtr->numCol;
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}
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RF_ASSERT(raidPtr->numRow == 1);
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/* fill in the remaining layout parameters */
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num_used_stripeUnitsPerDisk = layoutPtr->stripeUnitsPerDisk - (layoutPtr->stripeUnitsPerDisk %
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(2 * raidPtr->numCol - 2));
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info->numSparingRegions = num_used_stripeUnitsPerDisk / (2 * raidPtr->numCol - 2);
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info->stripeUnitsPerSparingRegion = raidPtr->numCol * (raidPtr->numCol - 1);
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info->mirrorStripeOffset = info->numSparingRegions * (raidPtr->numCol - 1);
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layoutPtr->numStripe = info->numSparingRegions * info->stripeUnitsPerSparingRegion;
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layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector;
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layoutPtr->numDataCol = 1;
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layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
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layoutPtr->numParityCol = 1;
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layoutPtr->dataStripeUnitsPerDisk = num_used_stripeUnitsPerDisk;
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raidPtr->sectorsPerDisk =
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num_used_stripeUnitsPerDisk * layoutPtr->sectorsPerStripeUnit;
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raidPtr->totalSectors =
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(layoutPtr->numStripe) * layoutPtr->sectorsPerStripeUnit;
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layoutPtr->stripeUnitsPerDisk = raidPtr->sectorsPerDisk / layoutPtr->sectorsPerStripeUnit;
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return (0);
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}
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RF_ReconUnitCount_t
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rf_GetNumSpareRUsChainDecluster(raidPtr)
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RF_Raid_t *raidPtr;
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{
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RF_ChaindeclusterConfigInfo_t *info = (RF_ChaindeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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/*
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* The layout uses two stripe units per disk as spare within each
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* sparing region.
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*/
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return (2 * info->numSparingRegions);
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}
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/* Maps to the primary copy of the data, i.e. the first mirror pair */
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void
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rf_MapSectorChainDecluster(
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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_ChaindeclusterConfigInfo_t *info = (RF_ChaindeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
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RF_SectorNum_t index_within_region, index_within_disk;
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RF_StripeNum_t sparing_region_id;
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int col_before_remap;
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*row = 0;
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sparing_region_id = SUID / info->stripeUnitsPerSparingRegion;
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index_within_region = SUID % info->stripeUnitsPerSparingRegion;
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index_within_disk = index_within_region / raidPtr->numCol;
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col_before_remap = SUID % raidPtr->numCol;
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if (!remap) {
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*col = col_before_remap;
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*diskSector = (index_within_disk + ((raidPtr->numCol - 1) * sparing_region_id)) *
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raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
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} else {
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/* remap sector to spare space... */
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*diskSector = sparing_region_id * (raidPtr->numCol + 1) * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += (raidPtr->numCol - 1) * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
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index_within_disk = index_within_region / raidPtr->numCol;
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if (index_within_disk < col_before_remap)
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*col = index_within_disk;
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else
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if (index_within_disk == raidPtr->numCol - 2) {
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*col = (col_before_remap + raidPtr->numCol - 1) % raidPtr->numCol;
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*diskSector += raidPtr->Layout.sectorsPerStripeUnit;
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} else
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*col = (index_within_disk + 2) % raidPtr->numCol;
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}
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}
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/* Maps to the second copy of the mirror pair, which is chain declustered. The second copy is contained
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in the next disk (mod numCol) after the disk containing the primary copy.
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The offset into the disk is one-half disk down */
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void
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rf_MapParityChainDecluster(
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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_ChaindeclusterConfigInfo_t *info = (RF_ChaindeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
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RF_SectorNum_t index_within_region, index_within_disk;
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RF_StripeNum_t sparing_region_id;
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int col_before_remap;
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*row = 0;
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if (!remap) {
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*col = SUID % raidPtr->numCol;
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*col = (*col + 1) % raidPtr->numCol;
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*diskSector = info->mirrorStripeOffset * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += (SUID / raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
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} else {
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/* remap parity to spare space ... */
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sparing_region_id = SUID / info->stripeUnitsPerSparingRegion;
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index_within_region = SUID % info->stripeUnitsPerSparingRegion;
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index_within_disk = index_within_region / raidPtr->numCol;
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*diskSector = sparing_region_id * (raidPtr->numCol + 1) * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += (raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
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col_before_remap = SUID % raidPtr->numCol;
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if (index_within_disk < col_before_remap)
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*col = index_within_disk;
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else
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if (index_within_disk == raidPtr->numCol - 2) {
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*col = (col_before_remap + 2) % raidPtr->numCol;
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*diskSector -= raidPtr->Layout.sectorsPerStripeUnit;
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} else
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*col = (index_within_disk + 2) % raidPtr->numCol;
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}
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}
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void
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rf_IdentifyStripeChainDecluster(
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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_ChaindeclusterConfigInfo_t *info = (RF_ChaindeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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RF_StripeNum_t SUID;
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RF_RowCol_t col;
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SUID = addr / raidPtr->Layout.sectorsPerStripeUnit;
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col = SUID % raidPtr->numCol;
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*outRow = 0;
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*diskids = info->stripeIdentifier[col];
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}
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void
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rf_MapSIDToPSIDChainDecluster(
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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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/******************************************************************************
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* select a graph to perform a single-stripe access
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*
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* Parameters: raidPtr - description of the physical array
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* type - type of operation (read or write) requested
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* asmap - logical & physical addresses for this access
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* createFunc - function to use to create the graph (return value)
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*****************************************************************************/
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void
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rf_RAIDCDagSelect(
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RF_Raid_t * raidPtr,
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RF_IoType_t type,
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RF_AccessStripeMap_t * asmap,
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RF_VoidFuncPtr * createFunc)
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#if 0
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void (**createFunc) (RF_Raid_t *, RF_AccessStripeMap_t *,
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RF_DagHeader_t *, void *, RF_RaidAccessFlags_t,
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/**INDENT** Warning@258: Extra ) */
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RF_AllocListElem_t *))
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#endif
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{
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RF_ASSERT(RF_IO_IS_R_OR_W(type));
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RF_ASSERT(raidPtr->numRow == 1);
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if (asmap->numDataFailed + asmap->numParityFailed > 1) {
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RF_ERRORMSG("Multiple disks failed in a single group! Aborting I/O operation.\n");
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*createFunc = NULL;
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return;
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}
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*createFunc = (type == RF_IO_TYPE_READ) ? (RF_VoidFuncPtr) rf_CreateFaultFreeReadDAG : (RF_VoidFuncPtr) rf_CreateRaidOneWriteDAG;
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if (type == RF_IO_TYPE_READ) {
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if ((raidPtr->status[0] == rf_rs_degraded) || (raidPtr->status[0] == rf_rs_reconstructing))
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*createFunc = (RF_VoidFuncPtr) rf_CreateRaidCDegradedReadDAG; /* array status is
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* degraded, implement
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* workload shifting */
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else
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*createFunc = (RF_VoidFuncPtr) rf_CreateMirrorPartitionReadDAG; /* array status not
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* degraded, so use
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* mirror partition dag */
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} else
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*createFunc = (RF_VoidFuncPtr) rf_CreateRaidOneWriteDAG;
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}
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