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Diffstat (limited to 'sys/dev/raidframe/rf_decluster.h')
| -rw-r--r-- | sys/dev/raidframe/rf_decluster.h | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/sys/dev/raidframe/rf_decluster.h b/sys/dev/raidframe/rf_decluster.h new file mode 100644 index 0000000..a630298 --- /dev/null +++ b/sys/dev/raidframe/rf_decluster.h @@ -0,0 +1,141 @@ +/* $FreeBSD$ */ +/* $NetBSD: rf_decluster.h,v 1.3 1999/02/05 00:06:09 oster Exp $ */ +/* + * Copyright (c) 1995 Carnegie-Mellon University. + * All rights reserved. + * + * Author: Mark Holland + * + * 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. + */ + +/*---------------------------------------------------------------------- + * + * decluster.h -- header file for declustered layout code + * + * Adapted from raidSim version July 1994 + * Created 10-21-92 (MCH) + * + *--------------------------------------------------------------------*/ + +#ifndef _RF__RF_DECLUSTER_H_ +#define _RF__RF_DECLUSTER_H_ + +#include <dev/raidframe/rf_types.h> + +/* + * These structures define the tables used to locate the spare unit + * associated with a particular data or parity unit, and to perform + * the associated inverse mapping. + */ +struct RF_SpareTableEntry_s { + u_int spareDisk; /* disk to which this block is spared */ + u_int spareBlockOffsetInSUs; /* offset into spare table for that + * disk */ +}; +#define RF_SPAREMAP_NAME_LEN 128 + +/* this is the layout-specific info structure for the declustered layout. + */ +struct RF_DeclusteredConfigInfo_s { + RF_StripeCount_t groupSize; /* no. of stripe units per parity + * stripe */ + RF_RowCol_t **LayoutTable; /* the block design table */ + RF_RowCol_t **OffsetTable; /* the sector offset table */ + RF_RowCol_t **BlockTable; /* the block membership table */ + RF_StripeCount_t SUsPerFullTable; /* stripe units per full table */ + RF_StripeCount_t SUsPerTable; /* stripe units per table */ + RF_StripeCount_t PUsPerBlock; /* parity units per block */ + RF_StripeCount_t SUsPerBlock; /* stripe units per block */ + RF_StripeCount_t BlocksPerTable; /* block design tuples per + * table */ + RF_StripeCount_t NumParityReps; /* tables per full table */ + RF_StripeCount_t TableDepthInPUs; /* PUs on one disk in 1 table */ + RF_StripeCount_t FullTableDepthInPUs; /* PUs on one disk in 1 + * fulltable */ + RF_StripeCount_t FullTableLimitSUID; /* SU where partial fulltables + * start */ + RF_StripeCount_t ExtraTablesPerDisk; /* # of tables in last + * fulltable */ + RF_SectorNum_t DiskOffsetOfLastFullTableInSUs; /* disk offs of partial + * ft, if any */ + RF_StripeCount_t numCompleteFullTablesPerDisk; /* ft identifier of + * partial ft, if any */ + u_int Lambda; /* the pair count in the block design */ + + /* these are used only in the distributed-sparing case */ + RF_StripeCount_t FullTablesPerSpareRegion; /* # of ft's comprising + * 1 spare region */ + RF_StripeCount_t TablesPerSpareRegion; /* # of tables */ + RF_SectorCount_t SpareSpaceDepthPerRegionInSUs; /* spare + * space/disk/region */ + RF_SectorCount_t SpareRegionDepthInSUs; /* # of units/disk/region */ + RF_SectorNum_t DiskOffsetOfLastSpareSpaceChunkInSUs; /* locates sp space + * after partial ft */ + RF_StripeCount_t TotSparePUsPerDisk; /* total number of spare PUs + * per disk */ + RF_StripeCount_t NumCompleteSRs; + RF_SpareTableEntry_t **SpareTable; /* remap table for spare space */ + char sparemap_fname[RF_SPAREMAP_NAME_LEN]; /* where to find + * sparemap. not used in + * kernel */ +}; + +int +rf_ConfigureDeclustered(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr, + RF_Config_t * cfgPtr); +int +rf_ConfigureDeclusteredDS(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr, + RF_Config_t * cfgPtr); + +void +rf_MapSectorDeclustered(RF_Raid_t * raidPtr, RF_RaidAddr_t raidSector, + RF_RowCol_t * row, RF_RowCol_t * col, RF_SectorNum_t * diskSector, int remap); +void +rf_MapParityDeclustered(RF_Raid_t * raidPtr, RF_RaidAddr_t raidSector, + RF_RowCol_t * row, RF_RowCol_t * col, RF_SectorNum_t * diskSector, int remap); +void +rf_IdentifyStripeDeclustered(RF_Raid_t * raidPtr, RF_RaidAddr_t addr, + RF_RowCol_t ** diskids, RF_RowCol_t * outRow); +void +rf_MapSIDToPSIDDeclustered(RF_RaidLayout_t * layoutPtr, + RF_StripeNum_t stripeID, RF_StripeNum_t * psID, + RF_ReconUnitNum_t * which_ru); +int rf_InstallSpareTable(RF_Raid_t * raidPtr, RF_RowCol_t frow, RF_RowCol_t fcol); +void rf_FreeSpareTable(RF_Raid_t * raidPtr); + +RF_HeadSepLimit_t rf_GetDefaultHeadSepLimitDeclustered(RF_Raid_t * raidPtr); +int rf_GetDefaultNumFloatingReconBuffersDeclustered(RF_Raid_t * raidPtr); + +void +rf_decluster_adjust_params(RF_RaidLayout_t * layoutPtr, + RF_StripeNum_t * SUID, RF_StripeCount_t * sus_per_fulltable, + RF_StripeCount_t * fulltable_depth, RF_StripeNum_t * base_suid); +void +rf_remap_to_spare_space( + RF_RaidLayout_t * layoutPtr, + RF_DeclusteredConfigInfo_t * info, RF_RowCol_t row, RF_StripeNum_t FullTableID, + RF_StripeNum_t TableID, RF_SectorNum_t BlockID, RF_StripeNum_t base_suid, + RF_StripeNum_t SpareRegion, RF_RowCol_t * outCol, RF_StripeNum_t * outSU); +int rf_SetSpareTable(RF_Raid_t * raidPtr, void *data); +RF_ReconUnitCount_t rf_GetNumSpareRUsDeclustered(RF_Raid_t * raidPtr); + +#endif /* !_RF__RF_DECLUSTER_H_ */ |
