rf_decluster.h revision 1.2
1 /* $NetBSD: rf_decluster.h,v 1.2 1999/01/26 02:33:55 oster Exp $ */ 2 /* 3 * Copyright (c) 1995 Carnegie-Mellon University. 4 * All rights reserved. 5 * 6 * Author: Mark Holland 7 * 8 * Permission to use, copy, modify and distribute this software and 9 * its documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 16 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie the 26 * rights to redistribute these changes. 27 */ 28 29 /*---------------------------------------------------------------------- 30 * 31 * decluster.h -- header file for declustered layout code 32 * 33 * Adapted from raidSim version July 1994 34 * Created 10-21-92 (MCH) 35 * 36 *--------------------------------------------------------------------*/ 37 38 #ifndef _RF__RF_DECLUSTER_H_ 39 #define _RF__RF_DECLUSTER_H_ 40 41 #include "rf_types.h" 42 43 /* 44 * These structures define the tables used to locate the spare unit 45 * associated with a particular data or parity unit, and to perform 46 * the associated inverse mapping. 47 */ 48 struct RF_SpareTableEntry_s { 49 u_int spareDisk; /* disk to which this block is spared */ 50 u_int spareBlockOffsetInSUs; /* offset into spare table for that disk */ 51 }; 52 53 #define RF_SPAREMAP_NAME_LEN 128 54 55 /* this is the layout-specific info structure for the declustered layout. 56 */ 57 struct RF_DeclusteredConfigInfo_s { 58 RF_StripeCount_t groupSize; /* no. of stripe units per parity stripe */ 59 RF_RowCol_t **LayoutTable; /* the block design table */ 60 RF_RowCol_t **OffsetTable; /* the sector offset table */ 61 RF_RowCol_t **BlockTable; /* the block membership table */ 62 RF_StripeCount_t SUsPerFullTable; /* stripe units per full table */ 63 RF_StripeCount_t SUsPerTable; /* stripe units per table */ 64 RF_StripeCount_t PUsPerBlock; /* parity units per block */ 65 RF_StripeCount_t SUsPerBlock; /* stripe units per block */ 66 RF_StripeCount_t BlocksPerTable; /* block design tuples per table */ 67 RF_StripeCount_t NumParityReps; /* tables per full table */ 68 RF_StripeCount_t TableDepthInPUs; /* PUs on one disk in 1 table */ 69 RF_StripeCount_t FullTableDepthInPUs; /* PUs on one disk in 1 fulltable */ 70 RF_StripeCount_t FullTableLimitSUID; /* SU where partial fulltables start */ 71 RF_StripeCount_t ExtraTablesPerDisk; /* # of tables in last fulltable */ 72 RF_SectorNum_t DiskOffsetOfLastFullTableInSUs; /* disk offs of partial ft, if any */ 73 RF_StripeCount_t numCompleteFullTablesPerDisk; /* ft identifier of partial ft, if any */ 74 u_int Lambda; /* the pair count in the block design */ 75 76 /* these are used only in the distributed-sparing case */ 77 RF_StripeCount_t FullTablesPerSpareRegion; /* # of ft's comprising 1 spare region */ 78 RF_StripeCount_t TablesPerSpareRegion; /* # of tables */ 79 RF_SectorCount_t SpareSpaceDepthPerRegionInSUs; /* spare space/disk/region */ 80 RF_SectorCount_t SpareRegionDepthInSUs; /* # of units/disk/region */ 81 RF_SectorNum_t DiskOffsetOfLastSpareSpaceChunkInSUs; /* locates sp space after partial ft */ 82 RF_StripeCount_t TotSparePUsPerDisk; /* total number of spare PUs per disk */ 83 RF_StripeCount_t NumCompleteSRs; 84 RF_SpareTableEntry_t **SpareTable; /* remap table for spare space */ 85 char sparemap_fname[RF_SPAREMAP_NAME_LEN]; /* where to find sparemap. not used in kernel */ 86 }; 87 88 int rf_ConfigureDeclustered(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr, 89 RF_Config_t *cfgPtr); 90 int rf_ConfigureDeclusteredDS(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr, 91 RF_Config_t *cfgPtr); 92 93 void rf_MapSectorDeclustered(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector, 94 RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap); 95 void rf_MapParityDeclustered(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector, 96 RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap); 97 void rf_IdentifyStripeDeclustered(RF_Raid_t *raidPtr, RF_RaidAddr_t addr, 98 RF_RowCol_t **diskids, RF_RowCol_t *outRow); 99 void rf_MapSIDToPSIDDeclustered(RF_RaidLayout_t *layoutPtr, 100 RF_StripeNum_t stripeID, RF_StripeNum_t *psID, 101 RF_ReconUnitNum_t *which_ru); 102 int rf_InstallSpareTable(RF_Raid_t *raidPtr, RF_RowCol_t frow, RF_RowCol_t fcol); 103 void rf_FreeSpareTable(RF_Raid_t *raidPtr); 104 105 RF_HeadSepLimit_t rf_GetDefaultHeadSepLimitDeclustered(RF_Raid_t *raidPtr); 106 int rf_GetDefaultNumFloatingReconBuffersDeclustered(RF_Raid_t *raidPtr); 107 108 void rf_decluster_adjust_params(RF_RaidLayout_t *layoutPtr, 109 RF_StripeNum_t *SUID, RF_StripeCount_t *sus_per_fulltable, 110 RF_StripeCount_t *fulltable_depth, RF_StripeNum_t *base_suid); 111 void rf_remap_to_spare_space( 112 RF_RaidLayout_t *layoutPtr, 113 RF_DeclusteredConfigInfo_t *info, RF_RowCol_t row, RF_StripeNum_t FullTableID, 114 RF_StripeNum_t TableID, RF_SectorNum_t BlockID, RF_StripeNum_t base_suid, 115 RF_StripeNum_t SpareRegion, RF_RowCol_t *outCol, RF_StripeNum_t *outSU); 116 int rf_SetSpareTable(RF_Raid_t *raidPtr, void *data); 117 RF_ReconUnitCount_t rf_GetNumSpareRUsDeclustered(RF_Raid_t *raidPtr); 118 119 #endif /* !_RF__RF_DECLUSTER_H_ */ 120
Indexes created Tue Sep 30 11:09:46 GMT 2025