/* $NetBSD: rf_decluster.h,v 1.1 1998/11/13 04:20:28 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) * *--------------------------------------------------------------------*/ /* * : * Log: rf_decluster.h,v * Revision 1.20 1996/07/29 14:05:12 jimz * fix numPUs/numRUs confusion (everything is now numRUs) * clean up some commenting, return values * * Revision 1.19 1996/07/13 00:00:59 jimz * sanitized generalized reconstruction architecture * cleaned up head sep, rbuf problems * * Revision 1.18 1996/06/19 17:53:48 jimz * move GetNumSparePUs, InstallSpareTable ops into layout switch * * Revision 1.17 1996/06/10 11:55:47 jimz * Straightened out some per-array/not-per-array distinctions, fixed * a couple bugs related to confusion. Added shutdown lists. Removed * layout shutdown function (now subsumed by shutdown lists). * * Revision 1.16 1996/06/09 02:36:46 jimz * lots of little crufty cleanup- fixup whitespace * issues, comment #ifdefs, improve typing in some * places (esp size-related) * * Revision 1.15 1996/06/07 22:26:27 jimz * type-ify which_ru (RF_ReconUnitNum_t) * * Revision 1.14 1996/06/07 21:33:04 jimz * begin using consistent types for sector numbers, * stripe numbers, row+col numbers, recon unit numbers * * Revision 1.13 1996/05/27 18:56:37 jimz * more code cleanup * better typing * compiles in all 3 environments * * Revision 1.12 1996/05/24 01:59:45 jimz * another checkpoint in code cleanup for release * time to sync kernel tree * * Revision 1.11 1996/05/23 21:46:35 jimz * checkpoint in code cleanup (release prep) * lots of types, function names have been fixed * * Revision 1.10 1996/05/18 19:51:34 jimz * major code cleanup- fix syntax, make some types consistent, * add prototypes, clean out dead code, et cetera * * Revision 1.9 1995/12/01 15:58:23 root * added copyright info * * Revision 1.8 1995/11/17 18:57:02 wvcii * added prototyping to MapParity * * Revision 1.7 1995/07/02 15:08:31 holland * bug fixes related to getting distributed sparing numbers * * Revision 1.6 1995/06/23 13:41:18 robby * updeated to prototypes in rf_layout.h * */ #ifndef _RF__RF_DECLUSTER_H_ #define _RF__RF_DECLUSTER_H_ #include "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_ */