rf_decluster.h revision 1.1
1/* $NetBSD: rf_decluster.h,v 1.1 1998/11/13 04:20:28 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/* 39 * : 40 * Log: rf_decluster.h,v 41 * Revision 1.20 1996/07/29 14:05:12 jimz 42 * fix numPUs/numRUs confusion (everything is now numRUs) 43 * clean up some commenting, return values 44 * 45 * Revision 1.19 1996/07/13 00:00:59 jimz 46 * sanitized generalized reconstruction architecture 47 * cleaned up head sep, rbuf problems 48 * 49 * Revision 1.18 1996/06/19 17:53:48 jimz 50 * move GetNumSparePUs, InstallSpareTable ops into layout switch 51 * 52 * Revision 1.17 1996/06/10 11:55:47 jimz 53 * Straightened out some per-array/not-per-array distinctions, fixed 54 * a couple bugs related to confusion. Added shutdown lists. Removed 55 * layout shutdown function (now subsumed by shutdown lists). 56 * 57 * Revision 1.16 1996/06/09 02:36:46 jimz 58 * lots of little crufty cleanup- fixup whitespace 59 * issues, comment #ifdefs, improve typing in some 60 * places (esp size-related) 61 * 62 * Revision 1.15 1996/06/07 22:26:27 jimz 63 * type-ify which_ru (RF_ReconUnitNum_t) 64 * 65 * Revision 1.14 1996/06/07 21:33:04 jimz 66 * begin using consistent types for sector numbers, 67 * stripe numbers, row+col numbers, recon unit numbers 68 * 69 * Revision 1.13 1996/05/27 18:56:37 jimz 70 * more code cleanup 71 * better typing 72 * compiles in all 3 environments 73 * 74 * Revision 1.12 1996/05/24 01:59:45 jimz 75 * another checkpoint in code cleanup for release 76 * time to sync kernel tree 77 * 78 * Revision 1.11 1996/05/23 21:46:35 jimz 79 * checkpoint in code cleanup (release prep) 80 * lots of types, function names have been fixed 81 * 82 * Revision 1.10 1996/05/18 19:51:34 jimz 83 * major code cleanup- fix syntax, make some types consistent, 84 * add prototypes, clean out dead code, et cetera 85 * 86 * Revision 1.9 1995/12/01 15:58:23 root 87 * added copyright info 88 * 89 * Revision 1.8 1995/11/17 18:57:02 wvcii 90 * added prototyping to MapParity 91 * 92 * Revision 1.7 1995/07/02 15:08:31 holland 93 * bug fixes related to getting distributed sparing numbers 94 * 95 * Revision 1.6 1995/06/23 13:41:18 robby 96 * updeated to prototypes in rf_layout.h 97 * 98 */ 99 100#ifndef _RF__RF_DECLUSTER_H_ 101#define _RF__RF_DECLUSTER_H_ 102 103#include "rf_types.h" 104 105/* 106 * These structures define the tables used to locate the spare unit 107 * associated with a particular data or parity unit, and to perform 108 * the associated inverse mapping. 109 */ 110struct RF_SpareTableEntry_s { 111 u_int spareDisk; /* disk to which this block is spared */ 112 u_int spareBlockOffsetInSUs; /* offset into spare table for that disk */ 113}; 114 115#define RF_SPAREMAP_NAME_LEN 128 116 117/* this is the layout-specific info structure for the declustered layout. 118 */ 119struct RF_DeclusteredConfigInfo_s { 120 RF_StripeCount_t groupSize; /* no. of stripe units per parity stripe */ 121 RF_RowCol_t **LayoutTable; /* the block design table */ 122 RF_RowCol_t **OffsetTable; /* the sector offset table */ 123 RF_RowCol_t **BlockTable; /* the block membership table */ 124 RF_StripeCount_t SUsPerFullTable; /* stripe units per full table */ 125 RF_StripeCount_t SUsPerTable; /* stripe units per table */ 126 RF_StripeCount_t PUsPerBlock; /* parity units per block */ 127 RF_StripeCount_t SUsPerBlock; /* stripe units per block */ 128 RF_StripeCount_t BlocksPerTable; /* block design tuples per table */ 129 RF_StripeCount_t NumParityReps; /* tables per full table */ 130 RF_StripeCount_t TableDepthInPUs; /* PUs on one disk in 1 table */ 131 RF_StripeCount_t FullTableDepthInPUs; /* PUs on one disk in 1 fulltable */ 132 RF_StripeCount_t FullTableLimitSUID; /* SU where partial fulltables start */ 133 RF_StripeCount_t ExtraTablesPerDisk; /* # of tables in last fulltable */ 134 RF_SectorNum_t DiskOffsetOfLastFullTableInSUs; /* disk offs of partial ft, if any */ 135 RF_StripeCount_t numCompleteFullTablesPerDisk; /* ft identifier of partial ft, if any */ 136 u_int Lambda; /* the pair count in the block design */ 137 138 /* these are used only in the distributed-sparing case */ 139 RF_StripeCount_t FullTablesPerSpareRegion; /* # of ft's comprising 1 spare region */ 140 RF_StripeCount_t TablesPerSpareRegion; /* # of tables */ 141 RF_SectorCount_t SpareSpaceDepthPerRegionInSUs; /* spare space/disk/region */ 142 RF_SectorCount_t SpareRegionDepthInSUs; /* # of units/disk/region */ 143 RF_SectorNum_t DiskOffsetOfLastSpareSpaceChunkInSUs; /* locates sp space after partial ft */ 144 RF_StripeCount_t TotSparePUsPerDisk; /* total number of spare PUs per disk */ 145 RF_StripeCount_t NumCompleteSRs; 146 RF_SpareTableEntry_t **SpareTable; /* remap table for spare space */ 147 char sparemap_fname[RF_SPAREMAP_NAME_LEN]; /* where to find sparemap. not used in kernel */ 148}; 149 150int rf_ConfigureDeclustered(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr, 151 RF_Config_t *cfgPtr); 152int rf_ConfigureDeclusteredDS(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr, 153 RF_Config_t *cfgPtr); 154 155void rf_MapSectorDeclustered(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector, 156 RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap); 157void rf_MapParityDeclustered(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector, 158 RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap); 159void rf_IdentifyStripeDeclustered(RF_Raid_t *raidPtr, RF_RaidAddr_t addr, 160 RF_RowCol_t **diskids, RF_RowCol_t *outRow); 161void rf_MapSIDToPSIDDeclustered(RF_RaidLayout_t *layoutPtr, 162 RF_StripeNum_t stripeID, RF_StripeNum_t *psID, 163 RF_ReconUnitNum_t *which_ru); 164int rf_InstallSpareTable(RF_Raid_t *raidPtr, RF_RowCol_t frow, RF_RowCol_t fcol); 165void rf_FreeSpareTable(RF_Raid_t *raidPtr); 166 167RF_HeadSepLimit_t rf_GetDefaultHeadSepLimitDeclustered(RF_Raid_t *raidPtr); 168int rf_GetDefaultNumFloatingReconBuffersDeclustered(RF_Raid_t *raidPtr); 169 170void rf_decluster_adjust_params(RF_RaidLayout_t *layoutPtr, 171 RF_StripeNum_t *SUID, RF_StripeCount_t *sus_per_fulltable, 172 RF_StripeCount_t *fulltable_depth, RF_StripeNum_t *base_suid); 173void rf_remap_to_spare_space( 174RF_RaidLayout_t *layoutPtr, 175RF_DeclusteredConfigInfo_t *info, RF_RowCol_t row, RF_StripeNum_t FullTableID, 176 RF_StripeNum_t TableID, RF_SectorNum_t BlockID, RF_StripeNum_t base_suid, 177 RF_StripeNum_t SpareRegion, RF_RowCol_t *outCol, RF_StripeNum_t *outSU); 178int rf_SetSpareTable(RF_Raid_t *raidPtr, void *data); 179RF_ReconUnitCount_t rf_GetNumSpareRUsDeclustered(RF_Raid_t *raidPtr); 180 181#endif /* !_RF__RF_DECLUSTER_H_ */ 182