sys/dev/raidframe/rf_decluster.h

   1 /*      $NetBSD: rf_decluster.h,v 1.6 2005/12/11 12:23:37 christos 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 <dev/raidframe/raidframevar.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
  49 /* this is the layout-specific info structure for the declustered layout.
  50  */
  51 struct RF_DeclusteredConfigInfo_s {
  52         RF_StripeCount_t groupSize;     /* no. of stripe units per parity
  53                                          * stripe */
  54         RF_RowCol_t **LayoutTable;      /* the block design table */
  55         RF_RowCol_t **OffsetTable;      /* the sector offset table */
  56         RF_RowCol_t **BlockTable;       /* the block membership table */
  57         RF_StripeCount_t SUsPerFullTable;       /* stripe units per full table */
  58         RF_StripeCount_t SUsPerTable;   /* stripe units per table */
  59         RF_StripeCount_t PUsPerBlock;   /* parity units per block */
  60         RF_StripeCount_t SUsPerBlock;   /* stripe units per block */
  61         RF_StripeCount_t BlocksPerTable;        /* block design tuples per
  62                                                  * table */
  63         RF_StripeCount_t NumParityReps; /* tables per full table */
  64         RF_StripeCount_t TableDepthInPUs;       /* PUs on one disk in 1 table */
  65         RF_StripeCount_t FullTableDepthInPUs;   /* PUs on one disk in 1
  66                                                  * fulltable */
  67         RF_StripeCount_t FullTableLimitSUID;    /* SU where partial fulltables
  68                                                  * start */
  69         RF_StripeCount_t ExtraTablesPerDisk;    /* # of tables in last
  70                                                  * fulltable */
  71         RF_SectorNum_t DiskOffsetOfLastFullTableInSUs;  /* disk offs of partial
  72                                                          * ft, if any */
  73         RF_StripeCount_t numCompleteFullTablesPerDisk;  /* ft identifier of
  74                                                          * partial ft, if any */
  75         u_int   Lambda;         /* the pair count in the block design */
  76
  77         /* these are used only in the distributed-sparing case */
  78         RF_StripeCount_t FullTablesPerSpareRegion;      /* # of ft's comprising
  79                                                          * 1 spare region */
  80         RF_StripeCount_t TablesPerSpareRegion;  /* # of tables */
  81         RF_SectorCount_t SpareSpaceDepthPerRegionInSUs; /* spare
  82                                                          * space/disk/region */
  83         RF_SectorCount_t SpareRegionDepthInSUs; /* # of units/disk/region */
  84         RF_SectorNum_t DiskOffsetOfLastSpareSpaceChunkInSUs;    /* locates sp space
  85                                                                  * after partial ft */
  86         RF_StripeCount_t TotSparePUsPerDisk;    /* total number of spare PUs
  87                                                  * per disk */
  88         RF_StripeCount_t NumCompleteSRs;
  89         RF_SpareTableEntry_t **SpareTable;      /* remap table for spare space */
  90         char    sparemap_fname[RF_SPAREMAP_NAME_LEN];   /* where to find
  91                                                          * sparemap. not used in
  92                                                          * kernel */
  93 };
  94
  95 int
  96 rf_ConfigureDeclustered(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr,
  97     RF_Config_t * cfgPtr);
  98 int
  99 rf_ConfigureDeclusteredDS(RF_ShutdownList_t ** listp, RF_Raid_t * raidPtr,
 100     RF_Config_t * cfgPtr);
 101
 102 void
 103 rf_MapSectorDeclustered(RF_Raid_t * raidPtr, RF_RaidAddr_t raidSector,
 104     RF_RowCol_t * col, RF_SectorNum_t * diskSector, int remap);
 105 void
 106 rf_MapParityDeclustered(RF_Raid_t * raidPtr, RF_RaidAddr_t raidSector,
 107     RF_RowCol_t * col, RF_SectorNum_t * diskSector, int remap);
 108 void
 109 rf_IdentifyStripeDeclustered(RF_Raid_t * raidPtr, RF_RaidAddr_t addr,
 110     RF_RowCol_t ** diskids);
 111 void
 112 rf_MapSIDToPSIDDeclustered(RF_RaidLayout_t * layoutPtr,
 113     RF_StripeNum_t stripeID, RF_StripeNum_t * psID,
 114     RF_ReconUnitNum_t * which_ru);
 115 int     rf_InstallSpareTable(RF_Raid_t * raidPtr, RF_RowCol_t frow, RF_RowCol_t fcol);
 116 void    rf_FreeSpareTable(RF_Raid_t * raidPtr);
 117
 118 RF_HeadSepLimit_t rf_GetDefaultHeadSepLimitDeclustered(RF_Raid_t * raidPtr);
 119 int     rf_GetDefaultNumFloatingReconBuffersDeclustered(RF_Raid_t * raidPtr);
 120
 121 void
 122 rf_decluster_adjust_params(RF_RaidLayout_t * layoutPtr,
 123     RF_StripeNum_t * SUID, RF_StripeCount_t * sus_per_fulltable,
 124     RF_StripeCount_t * fulltable_depth, RF_StripeNum_t * base_suid);
 125 void
 126 rf_remap_to_spare_space(
 127     RF_RaidLayout_t * layoutPtr,
 128     RF_DeclusteredConfigInfo_t * info, RF_StripeNum_t FullTableID,
 129     RF_StripeNum_t TableID, RF_SectorNum_t BlockID, RF_StripeNum_t base_suid,
 130     RF_StripeNum_t SpareRegion, RF_RowCol_t * outCol, RF_StripeNum_t * outSU);
 131 int     rf_SetSpareTable(RF_Raid_t * raidPtr, void *data);
 132 RF_ReconUnitCount_t rf_GetNumSpareRUsDeclustered(RF_Raid_t * raidPtr);
 133
 134 #endif                          /* !_RF__RF_DECLUSTER_H_ */