141 lines
5.6 KiB
C
141 lines
5.6 KiB
C
/* $NetBSD: rf_decluster.h,v 1.3 1999/02/05 00:06:09 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: Mark Holland
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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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* decluster.h -- header file for declustered layout code
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*
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* Adapted from raidSim version July 1994
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* Created 10-21-92 (MCH)
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*
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*--------------------------------------------------------------------*/
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#ifndef _RF__RF_DECLUSTER_H_
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#define _RF__RF_DECLUSTER_H_
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#include "rf_types.h"
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/*
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* These structures define the tables used to locate the spare unit
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* associated with a particular data or parity unit, and to perform
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* the associated inverse mapping.
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*/
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struct RF_SpareTableEntry_s {
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u_int spareDisk; /* disk to which this block is spared */
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u_int spareBlockOffsetInSUs; /* offset into spare table for that
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* disk */
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};
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#define RF_SPAREMAP_NAME_LEN 128
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/* this is the layout-specific info structure for the declustered layout.
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*/
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struct RF_DeclusteredConfigInfo_s {
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RF_StripeCount_t groupSize; /* no. of stripe units per parity
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* stripe */
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RF_RowCol_t **LayoutTable; /* the block design table */
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RF_RowCol_t **OffsetTable; /* the sector offset table */
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RF_RowCol_t **BlockTable; /* the block membership table */
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RF_StripeCount_t SUsPerFullTable; /* stripe units per full table */
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RF_StripeCount_t SUsPerTable; /* stripe units per table */
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RF_StripeCount_t PUsPerBlock; /* parity units per block */
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RF_StripeCount_t SUsPerBlock; /* stripe units per block */
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RF_StripeCount_t BlocksPerTable; /* block design tuples per
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* table */
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RF_StripeCount_t NumParityReps; /* tables per full table */
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RF_StripeCount_t TableDepthInPUs; /* PUs on one disk in 1 table */
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RF_StripeCount_t FullTableDepthInPUs; /* PUs on one disk in 1
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* fulltable */
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RF_StripeCount_t FullTableLimitSUID; /* SU where partial fulltables
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* start */
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RF_StripeCount_t ExtraTablesPerDisk; /* # of tables in last
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* fulltable */
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RF_SectorNum_t DiskOffsetOfLastFullTableInSUs; /* disk offs of partial
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* ft, if any */
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RF_StripeCount_t numCompleteFullTablesPerDisk; /* ft identifier of
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* partial ft, if any */
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u_int Lambda; /* the pair count in the block design */
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/* these are used only in the distributed-sparing case */
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RF_StripeCount_t FullTablesPerSpareRegion; /* # of ft's comprising
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* 1 spare region */
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RF_StripeCount_t TablesPerSpareRegion; /* # of tables */
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RF_SectorCount_t SpareSpaceDepthPerRegionInSUs; /* spare
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* space/disk/region */
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RF_SectorCount_t SpareRegionDepthInSUs; /* # of units/disk/region */
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RF_SectorNum_t DiskOffsetOfLastSpareSpaceChunkInSUs; /* locates sp space
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* after partial ft */
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RF_StripeCount_t TotSparePUsPerDisk; /* total number of spare PUs
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* per disk */
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RF_StripeCount_t NumCompleteSRs;
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RF_SpareTableEntry_t **SpareTable; /* remap table for spare space */
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char sparemap_fname[RF_SPAREMAP_NAME_LEN]; /* where to find
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* sparemap. not used in
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* kernel */
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};
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int
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rf_ConfigureDeclustered(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr,
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RF_Config_t * cfgPtr);
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int
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rf_ConfigureDeclusteredDS(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr,
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RF_Config_t * cfgPtr);
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void
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rf_MapSectorDeclustered(RF_Raid_t * raidPtr, RF_RaidAddr_t raidSector,
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RF_RowCol_t * row, RF_RowCol_t * col, RF_SectorNum_t * diskSector, int remap);
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void
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rf_MapParityDeclustered(RF_Raid_t * raidPtr, RF_RaidAddr_t raidSector,
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RF_RowCol_t * row, RF_RowCol_t * col, RF_SectorNum_t * diskSector, int remap);
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void
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rf_IdentifyStripeDeclustered(RF_Raid_t * raidPtr, RF_RaidAddr_t addr,
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RF_RowCol_t ** diskids, RF_RowCol_t * outRow);
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void
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rf_MapSIDToPSIDDeclustered(RF_RaidLayout_t * layoutPtr,
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RF_StripeNum_t stripeID, RF_StripeNum_t * psID,
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RF_ReconUnitNum_t * which_ru);
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int rf_InstallSpareTable(RF_Raid_t * raidPtr, RF_RowCol_t frow, RF_RowCol_t fcol);
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void rf_FreeSpareTable(RF_Raid_t * raidPtr);
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RF_HeadSepLimit_t rf_GetDefaultHeadSepLimitDeclustered(RF_Raid_t * raidPtr);
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int rf_GetDefaultNumFloatingReconBuffersDeclustered(RF_Raid_t * raidPtr);
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void
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rf_decluster_adjust_params(RF_RaidLayout_t * layoutPtr,
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RF_StripeNum_t * SUID, RF_StripeCount_t * sus_per_fulltable,
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RF_StripeCount_t * fulltable_depth, RF_StripeNum_t * base_suid);
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void
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rf_remap_to_spare_space(
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RF_RaidLayout_t * layoutPtr,
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RF_DeclusteredConfigInfo_t * info, RF_RowCol_t row, RF_StripeNum_t FullTableID,
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RF_StripeNum_t TableID, RF_SectorNum_t BlockID, RF_StripeNum_t base_suid,
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RF_StripeNum_t SpareRegion, RF_RowCol_t * outCol, RF_StripeNum_t * outSU);
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int rf_SetSpareTable(RF_Raid_t * raidPtr, void *data);
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RF_ReconUnitCount_t rf_GetNumSpareRUsDeclustered(RF_Raid_t * raidPtr);
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#endif /* !_RF__RF_DECLUSTER_H_ */
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