361 lines
13 KiB
C
361 lines
13 KiB
C
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/* $NetBSD: rf_interdecluster.c,v 1.1 1998/11/13 04:20:30 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: Khalil Amiri
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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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* rf_interdecluster.c -- implements interleaved declustering
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*
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************************************************************/
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/* :
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* Log: rf_interdecluster.c,v
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* Revision 1.24 1996/08/02 13:20:38 jimz
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* get rid of bogus (long) casts
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*
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* Revision 1.23 1996/07/31 16:56:18 jimz
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* dataBytesPerStripe, sectorsPerDisk init arch-indep.
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*
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* Revision 1.22 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 1.21 1996/07/22 19:52:16 jimz
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* switched node params to RF_DagParam_t, a union of
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* a 64-bit int and a void *, for better portability
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* attempted hpux port, but failed partway through for
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* lack of a single C compiler capable of compiling all
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* source files
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*
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* Revision 1.20 1996/07/18 22:57:14 jimz
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* port simulator to AIX
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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 1996/06/11 15:17:55 wvcii
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* added include of rf_interdecluster.h
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* fixed parameter list of rf_ConfigureInterDecluster
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* fixed return type of rf_GetNumSparePUsInterDecluster
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* removed include of rf_raid1.h
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*
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* Revision 1.16 1996/06/11 08:55:15 jimz
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* improved error-checking at configuration time
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*
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* Revision 1.15 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 1.14 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 1.13 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 1.12 1996/06/06 18:41:48 jimz
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* add interleaved declustering dag selection
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*
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* Revision 1.11 1996/06/02 17:31:48 jimz
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* Moved a lot of global stuff into array structure, where it belongs.
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* Fixed up paritylogging, pss modules in this manner. Some general
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* code cleanup. Removed lots of dead code, some dead files.
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*
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* Revision 1.10 1996/05/31 22:26:54 jimz
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* fix a lot of mapping problems, memory allocation problems
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* found some weird lock issues, fixed 'em
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* more code cleanup
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*
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* Revision 1.9 1996/05/31 05:03:01 amiri
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* fixed a bug related to sparing layout.
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*
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* Revision 1.8 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 1.7 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 1.6 1996/05/23 00:33:23 jimz
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* code cleanup: move all debug decls to rf_options.c, all extern
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* debug decls to rf_options.h, all debug vars preceded by rf_
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*
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* Revision 1.5 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 1.4 1996/05/03 19:50:38 wvcii
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* removed include of rf_redstripe.h
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* fixed change log parameters in header
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*
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*/
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#include "rf_types.h"
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#include "rf_raid.h"
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#include "rf_interdecluster.h"
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#include "rf_dag.h"
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#include "rf_dagutils.h"
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#include "rf_dagfuncs.h"
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#include "rf_threadid.h"
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#include "rf_general.h"
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#include "rf_utils.h"
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#include "rf_dagffrd.h"
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#include "rf_dagdegrd.h"
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#include "rf_dagffwr.h"
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#include "rf_dagdegwr.h"
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typedef struct RF_InterdeclusterConfigInfo_s {
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RF_RowCol_t **stripeIdentifier; /* filled in at config time
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* and used by IdentifyStripe */
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RF_StripeCount_t numSparingRegions;
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RF_StripeCount_t stripeUnitsPerSparingRegion;
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RF_SectorNum_t mirrorStripeOffset;
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} RF_InterdeclusterConfigInfo_t;
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int rf_ConfigureInterDecluster(
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RF_ShutdownList_t **listp,
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RF_Raid_t *raidPtr,
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RF_Config_t *cfgPtr)
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{
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RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
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RF_StripeCount_t num_used_stripeUnitsPerDisk;
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RF_InterdeclusterConfigInfo_t *info;
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RF_RowCol_t i, tmp, SUs_per_region;
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/* create an Interleaved Declustering configuration structure */
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RF_MallocAndAdd(info, sizeof(RF_InterdeclusterConfigInfo_t), (RF_InterdeclusterConfigInfo_t *),
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raidPtr->cleanupList);
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if (info == NULL)
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return(ENOMEM);
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layoutPtr->layoutSpecificInfo = (void *) info;
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/* fill in the config structure. */
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SUs_per_region = raidPtr->numCol * (raidPtr->numCol - 1);
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info->stripeIdentifier = rf_make_2d_array(SUs_per_region, 2 , raidPtr->cleanupList);
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if (info->stripeIdentifier == NULL)
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return(ENOMEM);
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for (i=0; i< SUs_per_region; i++) {
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info->stripeIdentifier[i][0] = i / (raidPtr->numCol-1);
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tmp = i / raidPtr->numCol;
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info->stripeIdentifier[i][1] = (i+1+tmp) % raidPtr->numCol;
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}
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/* no spare tables */
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RF_ASSERT(raidPtr->numRow == 1);
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/* fill in the remaining layout parameters */
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/* total number of stripes should a multiple of 2*numCol: Each sparing region consists of
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2*numCol stripes: n-1 primary copy, n-1 secondary copy and 2 for spare .. */
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num_used_stripeUnitsPerDisk = layoutPtr->stripeUnitsPerDisk - (layoutPtr->stripeUnitsPerDisk %
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(2*raidPtr->numCol) );
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info->numSparingRegions = num_used_stripeUnitsPerDisk / (2*raidPtr->numCol);
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/* this is in fact the number of stripe units (that are primary data copies) in the sparing region */
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info->stripeUnitsPerSparingRegion = raidPtr->numCol * (raidPtr->numCol - 1);
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info->mirrorStripeOffset = info->numSparingRegions * (raidPtr->numCol+1);
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layoutPtr->numStripe = info->numSparingRegions * info->stripeUnitsPerSparingRegion;
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layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector;
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layoutPtr->numDataCol = 1;
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layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
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layoutPtr->numParityCol = 1;
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layoutPtr->dataStripeUnitsPerDisk = num_used_stripeUnitsPerDisk;
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raidPtr->sectorsPerDisk =
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num_used_stripeUnitsPerDisk * layoutPtr->sectorsPerStripeUnit;
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raidPtr->totalSectors =
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(layoutPtr->numStripe) * layoutPtr->sectorsPerStripeUnit;
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layoutPtr->stripeUnitsPerDisk = raidPtr->sectorsPerDisk / layoutPtr->sectorsPerStripeUnit;
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return(0);
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}
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int rf_GetDefaultNumFloatingReconBuffersInterDecluster(RF_Raid_t *raidPtr)
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{
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return(30);
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}
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RF_HeadSepLimit_t rf_GetDefaultHeadSepLimitInterDecluster(RF_Raid_t *raidPtr)
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{
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return(raidPtr->sectorsPerDisk);
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}
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RF_ReconUnitCount_t rf_GetNumSpareRUsInterDecluster(
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RF_Raid_t *raidPtr)
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{
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RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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return ( 2 * ((RF_ReconUnitCount_t) info->numSparingRegions) );
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/* the layout uses two stripe units per disk as spare within each sparing region */
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}
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/* Maps to the primary copy of the data, i.e. the first mirror pair */
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void rf_MapSectorInterDecluster(
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RF_Raid_t *raidPtr,
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RF_RaidAddr_t raidSector,
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RF_RowCol_t *row,
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RF_RowCol_t *col,
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RF_SectorNum_t *diskSector,
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int remap)
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{
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RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
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RF_StripeNum_t su_offset_into_disk, mirror_su_offset_into_disk;
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RF_StripeNum_t sparing_region_id, index_within_region;
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int col_before_remap;
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*row = 0;
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sparing_region_id = SUID / info->stripeUnitsPerSparingRegion;
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index_within_region = SUID % info->stripeUnitsPerSparingRegion;
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su_offset_into_disk = index_within_region % (raidPtr->numCol-1);
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mirror_su_offset_into_disk = index_within_region / raidPtr->numCol;
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col_before_remap = index_within_region / (raidPtr->numCol-1);
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if (!remap) {
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*col = col_before_remap;;
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*diskSector = ( su_offset_into_disk + ( (raidPtr->numCol-1) * sparing_region_id) ) *
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raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
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}
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else {
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/* remap sector to spare space...*/
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*diskSector = sparing_region_id * (raidPtr->numCol+1) * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += (raidPtr->numCol-1) * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
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*col = (index_within_region + 1 + mirror_su_offset_into_disk) % raidPtr->numCol;
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*col = (*col + 1) % raidPtr->numCol;
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if (*col == col_before_remap) *col = (*col + 1) % raidPtr->numCol;
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}
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}
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/* Maps to the second copy of the mirror pair. */
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void rf_MapParityInterDecluster(
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RF_Raid_t *raidPtr,
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RF_RaidAddr_t raidSector,
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RF_RowCol_t *row,
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RF_RowCol_t *col,
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RF_SectorNum_t *diskSector,
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int remap)
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{
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RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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RF_StripeNum_t sparing_region_id, index_within_region, mirror_su_offset_into_disk;
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RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
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int col_before_remap;
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sparing_region_id = SUID / info->stripeUnitsPerSparingRegion;
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index_within_region = SUID % info->stripeUnitsPerSparingRegion;
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mirror_su_offset_into_disk = index_within_region / raidPtr->numCol;
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col_before_remap = (index_within_region + 1 + mirror_su_offset_into_disk) % raidPtr->numCol;
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*row = 0;
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if (!remap) {
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*col = col_before_remap;
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*diskSector = info->mirrorStripeOffset * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += sparing_region_id * (raidPtr->numCol-1) * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += mirror_su_offset_into_disk * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
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}
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else {
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/* remap parity to spare space ... */
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*diskSector = sparing_region_id * (raidPtr->numCol+1) * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += (raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
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*col = index_within_region / (raidPtr->numCol-1);
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*col = (*col + 1) % raidPtr->numCol;
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if (*col == col_before_remap) *col = (*col + 1) % raidPtr->numCol;
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}
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}
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void rf_IdentifyStripeInterDecluster(
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RF_Raid_t *raidPtr,
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RF_RaidAddr_t addr,
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RF_RowCol_t **diskids,
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RF_RowCol_t *outRow)
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{
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RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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RF_StripeNum_t SUID;
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SUID = addr / raidPtr->Layout.sectorsPerStripeUnit;
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SUID = SUID % info->stripeUnitsPerSparingRegion;
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*outRow = 0;
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*diskids = info->stripeIdentifier[ SUID ];
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}
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void rf_MapSIDToPSIDInterDecluster(
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RF_RaidLayout_t *layoutPtr,
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RF_StripeNum_t stripeID,
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RF_StripeNum_t *psID,
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RF_ReconUnitNum_t *which_ru)
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{
|
||
|
|
*which_ru = 0;
|
||
|
|
*psID = stripeID;
|
||
|
|
}
|
||
|
|
|
||
|
|
/******************************************************************************
|
||
|
|
* select a graph to perform a single-stripe access
|
||
|
|
*
|
||
|
|
* Parameters: raidPtr - description of the physical array
|
||
|
|
* type - type of operation (read or write) requested
|
||
|
|
* asmap - logical & physical addresses for this access
|
||
|
|
* createFunc - name of function to use to create the graph
|
||
|
|
*****************************************************************************/
|
||
|
|
|
||
|
|
void rf_RAIDIDagSelect(
|
||
|
|
RF_Raid_t *raidPtr,
|
||
|
|
RF_IoType_t type,
|
||
|
|
RF_AccessStripeMap_t *asmap,
|
||
|
|
RF_VoidFuncPtr *createFunc)
|
||
|
|
{
|
||
|
|
RF_ASSERT(RF_IO_IS_R_OR_W(type));
|
||
|
|
|
||
|
|
if (asmap->numDataFailed + asmap->numParityFailed > 1) {
|
||
|
|
RF_ERRORMSG("Multiple disks failed in a single group! Aborting I/O operation.\n");
|
||
|
|
*createFunc = NULL;
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
*createFunc = (type == RF_IO_TYPE_READ) ? (RF_VoidFuncPtr)rf_CreateFaultFreeReadDAG : (RF_VoidFuncPtr)rf_CreateRaidOneWriteDAG;
|
||
|
|
if (type == RF_IO_TYPE_READ) {
|
||
|
|
if (asmap->numDataFailed == 0)
|
||
|
|
*createFunc = (RF_VoidFuncPtr)rf_CreateMirrorPartitionReadDAG;
|
||
|
|
else
|
||
|
|
*createFunc = (RF_VoidFuncPtr)rf_CreateRaidOneDegradedReadDAG;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
*createFunc = (RF_VoidFuncPtr)rf_CreateRaidOneWriteDAG;
|
||
|
|
}
|