1 /* $NetBSD: rf_decluster.h,v 1.3 1999/02/05 00:06:09 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@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 51 * disk */ 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 59 * stripe */ 60 RF_RowCol_t **LayoutTable; /* the block design table */ 61 RF_RowCol_t **OffsetTable; /* the sector offset table */ 62 RF_RowCol_t **BlockTable; /* the block membership table */ 63 RF_StripeCount_t SUsPerFullTable; /* stripe units per full table */ 64 RF_StripeCount_t SUsPerTable; /* stripe units per table */ 65 RF_StripeCount_t PUsPerBlock; /* parity units per block */ 66 RF_StripeCount_t SUsPerBlock; /* stripe units per block */ 67 RF_StripeCount_t BlocksPerTable; /* block design tuples per 68 * table */ 69 RF_StripeCount_t NumParityReps; /* tables per full table */ 70 RF_StripeCount_t TableDepthInPUs; /* PUs on one disk in 1 table */ 71 RF_StripeCount_t FullTableDepthInPUs; /* PUs on one disk in 1 72 * fulltable */ 73 RF_StripeCount_t FullTableLimitSUID; /* SU where partial fulltables 74 * start */ 75 RF_StripeCount_t ExtraTablesPerDisk; /* # of tables in last 76 * fulltable */ 77 RF_SectorNum_t DiskOffsetOfLastFullTableInSUs; /* disk offs of partial 78 * ft, if any */ 79 RF_StripeCount_t numCompleteFullTablesPerDisk; /* ft identifier of 80 * partial ft, if any */ 81 u_int Lambda; /* the pair count in the block design */ 82 83 /* these are used only in the distributed-sparing case */ 84 RF_StripeCount_t FullTablesPerSpareRegion; /* # of ft's comprising 85 * 1 spare region */ 86 RF_StripeCount_t TablesPerSpareRegion; /* # of tables */ 87 RF_SectorCount_t SpareSpaceDepthPerRegionInSUs; /* spare 88 * space/disk/region */ 89 RF_SectorCount_t SpareRegionDepthInSUs; /* # of units/disk/region */ 90 RF_SectorNum_t DiskOffsetOfLastSpareSpaceChunkInSUs; /* locates sp space 91 * after partial ft */ 92 RF_StripeCount_t TotSparePUsPerDisk; /* total number of spare PUs 93 * per disk */ 94 RF_StripeCount_t NumCompleteSRs; 95 RF_SpareTableEntry_t **SpareTable; /* remap table for spare space */ 96 char sparemap_fname[RF_SPAREMAP_NAME_LEN]; /* where to find 97 * sparemap. not used in 98 * kernel */ 99 }; 100 101 int 102 rf_ConfigureDeclustered(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr, 103 RF_Config_t * cfgPtr); 104 int 105 rf_ConfigureDeclusteredDS(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr, 106 RF_Config_t * cfgPtr); 107 108 void 109 rf_MapSectorDeclustered(RF_Raid_t * raidPtr, RF_RaidAddr_t raidSector, 110 RF_RowCol_t * row, RF_RowCol_t * col, RF_SectorNum_t * diskSector, int remap); 111 void 112 rf_MapParityDeclustered(RF_Raid_t * raidPtr, RF_RaidAddr_t raidSector, 113 RF_RowCol_t * row, RF_RowCol_t * col, RF_SectorNum_t * diskSector, int remap); 114 void 115 rf_IdentifyStripeDeclustered(RF_Raid_t * raidPtr, RF_RaidAddr_t addr, 116 RF_RowCol_t ** diskids, RF_RowCol_t * outRow); 117 void 118 rf_MapSIDToPSIDDeclustered(RF_RaidLayout_t * layoutPtr, 119 RF_StripeNum_t stripeID, RF_StripeNum_t * psID, 120 RF_ReconUnitNum_t * which_ru); 121 int rf_InstallSpareTable(RF_Raid_t * raidPtr, RF_RowCol_t frow, RF_RowCol_t fcol); 122 void rf_FreeSpareTable(RF_Raid_t * raidPtr); 123 124 RF_HeadSepLimit_t rf_GetDefaultHeadSepLimitDeclustered(RF_Raid_t * raidPtr); 125 int rf_GetDefaultNumFloatingReconBuffersDeclustered(RF_Raid_t * raidPtr); 126 127 void 128 rf_decluster_adjust_params(RF_RaidLayout_t * layoutPtr, 129 RF_StripeNum_t * SUID, RF_StripeCount_t * sus_per_fulltable, 130 RF_StripeCount_t * fulltable_depth, RF_StripeNum_t * base_suid); 131 void 132 rf_remap_to_spare_space( 133 RF_RaidLayout_t * layoutPtr, 134 RF_DeclusteredConfigInfo_t * info, RF_RowCol_t row, RF_StripeNum_t FullTableID, 135 RF_StripeNum_t TableID, RF_SectorNum_t BlockID, RF_StripeNum_t base_suid, 136 RF_StripeNum_t SpareRegion, RF_RowCol_t * outCol, RF_StripeNum_t * outSU); 137 int rf_SetSpareTable(RF_Raid_t * raidPtr, void *data); 138 RF_ReconUnitCount_t rf_GetNumSpareRUsDeclustered(RF_Raid_t * raidPtr); 139 140 #endif /* !_RF__RF_DECLUSTER_H_ */ 141