280 lines
9.9 KiB
C
280 lines
9.9 KiB
C
/* $NetBSD: rf_interdecluster.c,v 1.3 1999/02/05 00:06:12 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_interdecluster.c -- implements interleaved declustering
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*
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************************************************************/
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#include "rf_types.h"
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#include "rf_raid.h"
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#include "rf_interdecluster.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_threadid.h"
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#include "rf_general.h"
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#include "rf_utils.h"
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#include "rf_dagffrd.h"
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#include "rf_dagdegrd.h"
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#include "rf_dagffwr.h"
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#include "rf_dagdegwr.h"
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typedef struct RF_InterdeclusterConfigInfo_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_InterdeclusterConfigInfo_t;
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int
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rf_ConfigureInterDecluster(
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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_InterdeclusterConfigInfo_t *info;
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RF_RowCol_t i, tmp, SUs_per_region;
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/* create an Interleaved Declustering configuration structure */
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RF_MallocAndAdd(info, sizeof(RF_InterdeclusterConfigInfo_t), (RF_InterdeclusterConfigInfo_t *),
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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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SUs_per_region = raidPtr->numCol * (raidPtr->numCol - 1);
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info->stripeIdentifier = rf_make_2d_array(SUs_per_region, 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 < SUs_per_region; i++) {
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info->stripeIdentifier[i][0] = i / (raidPtr->numCol - 1);
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tmp = i / raidPtr->numCol;
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info->stripeIdentifier[i][1] = (i + 1 + tmp) % raidPtr->numCol;
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}
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/* no spare tables */
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RF_ASSERT(raidPtr->numRow == 1);
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/* fill in the remaining layout parameters */
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/* total number of stripes should a multiple of 2*numCol: Each sparing
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* region consists of 2*numCol stripes: n-1 primary copy, n-1
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* secondary copy and 2 for spare .. */
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num_used_stripeUnitsPerDisk = layoutPtr->stripeUnitsPerDisk - (layoutPtr->stripeUnitsPerDisk %
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(2 * raidPtr->numCol));
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info->numSparingRegions = num_used_stripeUnitsPerDisk / (2 * raidPtr->numCol);
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/* this is in fact the number of stripe units (that are primary data
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* copies) in the sparing region */
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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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int
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rf_GetDefaultNumFloatingReconBuffersInterDecluster(RF_Raid_t * raidPtr)
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{
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return (30);
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}
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RF_HeadSepLimit_t
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rf_GetDefaultHeadSepLimitInterDecluster(RF_Raid_t * raidPtr)
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{
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return (raidPtr->sectorsPerDisk);
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}
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RF_ReconUnitCount_t
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rf_GetNumSpareRUsInterDecluster(
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RF_Raid_t * raidPtr)
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{
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RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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return (2 * ((RF_ReconUnitCount_t) info->numSparingRegions));
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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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/* Maps to the primary copy of the data, i.e. the first mirror pair */
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void
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rf_MapSectorInterDecluster(
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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_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
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RF_StripeNum_t su_offset_into_disk, mirror_su_offset_into_disk;
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RF_StripeNum_t sparing_region_id, index_within_region;
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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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su_offset_into_disk = index_within_region % (raidPtr->numCol - 1);
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mirror_su_offset_into_disk = index_within_region / raidPtr->numCol;
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col_before_remap = index_within_region / (raidPtr->numCol - 1);
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if (!remap) {
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*col = col_before_remap;;
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*diskSector = (su_offset_into_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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*col = (index_within_region + 1 + mirror_su_offset_into_disk) % raidPtr->numCol;
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*col = (*col + 1) % raidPtr->numCol;
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if (*col == col_before_remap)
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*col = (*col + 1) % raidPtr->numCol;
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}
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}
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/* Maps to the second copy of the mirror pair. */
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void
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rf_MapParityInterDecluster(
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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_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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RF_StripeNum_t sparing_region_id, index_within_region, mirror_su_offset_into_disk;
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RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
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int col_before_remap;
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sparing_region_id = SUID / info->stripeUnitsPerSparingRegion;
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index_within_region = SUID % info->stripeUnitsPerSparingRegion;
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mirror_su_offset_into_disk = index_within_region / raidPtr->numCol;
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col_before_remap = (index_within_region + 1 + mirror_su_offset_into_disk) % raidPtr->numCol;
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*row = 0;
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if (!remap) {
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*col = col_before_remap;
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*diskSector = info->mirrorStripeOffset * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += sparing_region_id * (raidPtr->numCol - 1) * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += mirror_su_offset_into_disk * 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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*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 = index_within_region / (raidPtr->numCol - 1);
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*col = (*col + 1) % raidPtr->numCol;
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if (*col == col_before_remap)
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*col = (*col + 1) % raidPtr->numCol;
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}
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}
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void
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rf_IdentifyStripeInterDecluster(
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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_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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RF_StripeNum_t SUID;
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SUID = addr / raidPtr->Layout.sectorsPerStripeUnit;
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SUID = SUID % info->stripeUnitsPerSparingRegion;
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*outRow = 0;
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*diskids = info->stripeIdentifier[SUID];
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}
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void
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rf_MapSIDToPSIDInterDecluster(
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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 - name of function to use to create the graph
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*****************************************************************************/
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void
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rf_RAIDIDagSelect(
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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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{
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RF_ASSERT(RF_IO_IS_R_OR_W(type));
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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 (asmap->numDataFailed == 0)
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*createFunc = (RF_VoidFuncPtr) rf_CreateMirrorPartitionReadDAG;
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else
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*createFunc = (RF_VoidFuncPtr) rf_CreateRaidOneDegradedReadDAG;
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} else
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*createFunc = (RF_VoidFuncPtr) rf_CreateRaidOneWriteDAG;
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}
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