182 lines
7.8 KiB
C
182 lines
7.8 KiB
C
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/* $NetBSD: rf_decluster.h,v 1.1 1998/11/13 04:20:28 oster Exp $ */
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/*
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* Copyright (c) 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Mark Holland
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*----------------------------------------------------------------------
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*
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* decluster.h -- header file for declustered layout code
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*
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* Adapted from raidSim version July 1994
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* Created 10-21-92 (MCH)
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*
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*--------------------------------------------------------------------*/
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/*
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* :
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* Log: rf_decluster.h,v
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* Revision 1.20 1996/07/29 14:05:12 jimz
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* fix numPUs/numRUs confusion (everything is now numRUs)
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* clean up some commenting, return values
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*
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* Revision 1.19 1996/07/13 00:00:59 jimz
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* sanitized generalized reconstruction architecture
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* cleaned up head sep, rbuf problems
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*
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* Revision 1.18 1996/06/19 17:53:48 jimz
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* move GetNumSparePUs, InstallSpareTable ops into layout switch
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*
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* Revision 1.17 1996/06/10 11:55:47 jimz
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* Straightened out some per-array/not-per-array distinctions, fixed
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* a couple bugs related to confusion. Added shutdown lists. Removed
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* layout shutdown function (now subsumed by shutdown lists).
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*
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* Revision 1.16 1996/06/09 02:36:46 jimz
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* lots of little crufty cleanup- fixup whitespace
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* issues, comment #ifdefs, improve typing in some
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* places (esp size-related)
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*
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* Revision 1.15 1996/06/07 22:26:27 jimz
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* type-ify which_ru (RF_ReconUnitNum_t)
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*
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* Revision 1.14 1996/06/07 21:33:04 jimz
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* begin using consistent types for sector numbers,
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* stripe numbers, row+col numbers, recon unit numbers
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*
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* Revision 1.13 1996/05/27 18:56:37 jimz
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* more code cleanup
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* better typing
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* compiles in all 3 environments
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*
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* Revision 1.12 1996/05/24 01:59:45 jimz
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* another checkpoint in code cleanup for release
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* time to sync kernel tree
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*
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* Revision 1.11 1996/05/23 21:46:35 jimz
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* checkpoint in code cleanup (release prep)
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* lots of types, function names have been fixed
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*
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* Revision 1.10 1996/05/18 19:51:34 jimz
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* major code cleanup- fix syntax, make some types consistent,
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* add prototypes, clean out dead code, et cetera
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*
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* Revision 1.9 1995/12/01 15:58:23 root
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* added copyright info
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*
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* Revision 1.8 1995/11/17 18:57:02 wvcii
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* added prototyping to MapParity
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*
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* Revision 1.7 1995/07/02 15:08:31 holland
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* bug fixes related to getting distributed sparing numbers
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*
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* Revision 1.6 1995/06/23 13:41:18 robby
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* updeated to prototypes in rf_layout.h
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*
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*/
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#ifndef _RF__RF_DECLUSTER_H_
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#define _RF__RF_DECLUSTER_H_
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#include "rf_types.h"
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/*
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* These structures define the tables used to locate the spare unit
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* associated with a particular data or parity unit, and to perform
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* the associated inverse mapping.
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*/
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struct RF_SpareTableEntry_s {
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u_int spareDisk; /* disk to which this block is spared */
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u_int spareBlockOffsetInSUs; /* offset into spare table for that disk */
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};
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#define RF_SPAREMAP_NAME_LEN 128
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/* this is the layout-specific info structure for the declustered layout.
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*/
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struct RF_DeclusteredConfigInfo_s {
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RF_StripeCount_t groupSize; /* no. of stripe units per parity stripe */
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RF_RowCol_t **LayoutTable; /* the block design table */
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RF_RowCol_t **OffsetTable; /* the sector offset table */
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RF_RowCol_t **BlockTable; /* the block membership table */
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RF_StripeCount_t SUsPerFullTable; /* stripe units per full table */
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RF_StripeCount_t SUsPerTable; /* stripe units per table */
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RF_StripeCount_t PUsPerBlock; /* parity units per block */
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RF_StripeCount_t SUsPerBlock; /* stripe units per block */
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RF_StripeCount_t BlocksPerTable; /* block design tuples per table */
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RF_StripeCount_t NumParityReps; /* tables per full table */
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RF_StripeCount_t TableDepthInPUs; /* PUs on one disk in 1 table */
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RF_StripeCount_t FullTableDepthInPUs; /* PUs on one disk in 1 fulltable */
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RF_StripeCount_t FullTableLimitSUID; /* SU where partial fulltables start */
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RF_StripeCount_t ExtraTablesPerDisk; /* # of tables in last fulltable */
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RF_SectorNum_t DiskOffsetOfLastFullTableInSUs; /* disk offs of partial ft, if any */
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RF_StripeCount_t numCompleteFullTablesPerDisk; /* ft identifier of partial ft, if any */
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u_int Lambda; /* the pair count in the block design */
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/* these are used only in the distributed-sparing case */
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RF_StripeCount_t FullTablesPerSpareRegion; /* # of ft's comprising 1 spare region */
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RF_StripeCount_t TablesPerSpareRegion; /* # of tables */
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RF_SectorCount_t SpareSpaceDepthPerRegionInSUs; /* spare space/disk/region */
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RF_SectorCount_t SpareRegionDepthInSUs; /* # of units/disk/region */
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RF_SectorNum_t DiskOffsetOfLastSpareSpaceChunkInSUs; /* locates sp space after partial ft */
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RF_StripeCount_t TotSparePUsPerDisk; /* total number of spare PUs per disk */
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RF_StripeCount_t NumCompleteSRs;
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RF_SpareTableEntry_t **SpareTable; /* remap table for spare space */
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char sparemap_fname[RF_SPAREMAP_NAME_LEN]; /* where to find sparemap. not used in kernel */
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};
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int rf_ConfigureDeclustered(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
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RF_Config_t *cfgPtr);
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int rf_ConfigureDeclusteredDS(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
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RF_Config_t *cfgPtr);
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void rf_MapSectorDeclustered(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
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RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap);
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void rf_MapParityDeclustered(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
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RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap);
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void rf_IdentifyStripeDeclustered(RF_Raid_t *raidPtr, RF_RaidAddr_t addr,
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RF_RowCol_t **diskids, RF_RowCol_t *outRow);
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void rf_MapSIDToPSIDDeclustered(RF_RaidLayout_t *layoutPtr,
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RF_StripeNum_t stripeID, RF_StripeNum_t *psID,
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RF_ReconUnitNum_t *which_ru);
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int rf_InstallSpareTable(RF_Raid_t *raidPtr, RF_RowCol_t frow, RF_RowCol_t fcol);
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void rf_FreeSpareTable(RF_Raid_t *raidPtr);
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RF_HeadSepLimit_t rf_GetDefaultHeadSepLimitDeclustered(RF_Raid_t *raidPtr);
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int rf_GetDefaultNumFloatingReconBuffersDeclustered(RF_Raid_t *raidPtr);
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void rf_decluster_adjust_params(RF_RaidLayout_t *layoutPtr,
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RF_StripeNum_t *SUID, RF_StripeCount_t *sus_per_fulltable,
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RF_StripeCount_t *fulltable_depth, RF_StripeNum_t *base_suid);
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void rf_remap_to_spare_space(
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RF_RaidLayout_t *layoutPtr,
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RF_DeclusteredConfigInfo_t *info, RF_RowCol_t row, RF_StripeNum_t FullTableID,
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RF_StripeNum_t TableID, RF_SectorNum_t BlockID, RF_StripeNum_t base_suid,
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RF_StripeNum_t SpareRegion, RF_RowCol_t *outCol, RF_StripeNum_t *outSU);
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int rf_SetSpareTable(RF_Raid_t *raidPtr, void *data);
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RF_ReconUnitCount_t rf_GetNumSpareRUsDeclustered(RF_Raid_t *raidPtr);
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#endif /* !_RF__RF_DECLUSTER_H_ */
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