38a3987b69
Carnegie Mellon University. Full RAID implementation, including levels 0, 1, 4, 5, 6, parity logging, and a few other goodies. Ported to NetBSD by Greg Oster.
382 lines
14 KiB
C
382 lines
14 KiB
C
/* $NetBSD: rf_chaindecluster.c,v 1.1 1998/11/13 04:20:26 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_chaindecluster.c -- implements chained declustering
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*
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*****************************************************************************/
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/* :
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* Log: rf_chaindecluster.c,v
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* Revision 1.33 1996/08/02 13:20:34 jimz
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* get rid of bogus (long) casts
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*
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* Revision 1.32 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 1.31 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 1.30 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 1.29 1996/07/18 22:57:14 jimz
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* port simulator to AIX
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*
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* Revision 1.28 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 1.27 1996/06/11 15:19:57 wvcii
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* added include of rf_chaindecluster.h
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* fixed parameter list of rf_ConfigureChainDecluster
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*
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* Revision 1.26 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 1.25 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 1.24 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 1.23 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 1.22 1996/06/06 17:31:30 jimz
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* use CreateMirrorPartitionReadDAG for mirrored reads
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*
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* Revision 1.21 1996/06/03 23:28:26 jimz
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* more bugfixes
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* check in tree to sync for IPDS runs with current bugfixes
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* there still may be a problem with threads in the script test
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* getting I/Os stuck- not trivially reproducible (runs ~50 times
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* in a row without getting stuck)
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*
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* Revision 1.20 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 1.19 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 1.18 1996/05/31 16:13:28 amiri
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* removed/added some commnets.
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*
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* Revision 1.17 1996/05/31 05:01:52 amiri
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* fixed a bug related to sparing layout.
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*
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* Revision 1.16 1996/05/30 23:22:16 jimz
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* bugfixes of serialization, timing problems
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* more cleanup
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*
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* Revision 1.15 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 1.14 1996/05/24 22:17:04 jimz
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* continue code + namespace cleanup
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* typed a bunch of flags
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*
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* Revision 1.13 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 1.12 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 1.11 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 1.10 1996/05/03 19:53:56 wvcii
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* removed include of rf_redstripe.h
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* moved dag creation routines to new dag library
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*
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*/
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#include "rf_archs.h"
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#include "rf_types.h"
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#include "rf_raid.h"
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#include "rf_chaindecluster.h"
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#include "rf_dag.h"
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#include "rf_dagutils.h"
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#include "rf_dagffrd.h"
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#include "rf_dagffwr.h"
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#include "rf_dagdegrd.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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typedef struct RF_ChaindeclusterConfigInfo_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_ChaindeclusterConfigInfo_t;
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int rf_ConfigureChainDecluster(
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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_ChaindeclusterConfigInfo_t *info;
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RF_RowCol_t i;
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/* create a Chained Declustering configuration structure */
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RF_MallocAndAdd(info, sizeof(RF_ChaindeclusterConfigInfo_t), (RF_ChaindeclusterConfigInfo_t *), 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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info->stripeIdentifier = rf_make_2d_array(raidPtr->numCol, 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< raidPtr->numCol; i++) {
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info->stripeIdentifier[i][0] = i % raidPtr->numCol;
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info->stripeIdentifier[i][1] = (i+1) % raidPtr->numCol;
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}
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RF_ASSERT(raidPtr->numRow == 1);
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/* fill in the remaining layout parameters */
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num_used_stripeUnitsPerDisk = layoutPtr->stripeUnitsPerDisk - (layoutPtr->stripeUnitsPerDisk %
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(2*raidPtr->numCol-2) );
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info->numSparingRegions = num_used_stripeUnitsPerDisk / (2*raidPtr->numCol-2);
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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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RF_ReconUnitCount_t rf_GetNumSpareRUsChainDecluster(raidPtr)
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RF_Raid_t *raidPtr;
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{
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RF_ChaindeclusterConfigInfo_t *info = (RF_ChaindeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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/*
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* The layout uses two stripe units per disk as spare within each
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* sparing region.
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*/
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return (2*info->numSparingRegions);
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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_MapSectorChainDecluster(
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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_ChaindeclusterConfigInfo_t *info = (RF_ChaindeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
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RF_SectorNum_t index_within_region, index_within_disk;
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RF_StripeNum_t sparing_region_id;
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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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index_within_disk = index_within_region / raidPtr->numCol;
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col_before_remap = SUID % raidPtr->numCol;
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if (!remap) {
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*col = col_before_remap;
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*diskSector = ( index_within_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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index_within_disk = index_within_region / raidPtr->numCol;
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if (index_within_disk < col_before_remap )
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*col = index_within_disk;
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else if (index_within_disk == raidPtr->numCol-2 ) {
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*col = (col_before_remap+raidPtr->numCol-1) % raidPtr->numCol;
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*diskSector += raidPtr->Layout.sectorsPerStripeUnit;
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}
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else
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*col = (index_within_disk + 2) % raidPtr->numCol;
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}
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}
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/* Maps to the second copy of the mirror pair, which is chain declustered. The second copy is contained
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in the next disk (mod numCol) after the disk containing the primary copy.
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The offset into the disk is one-half disk down */
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void rf_MapParityChainDecluster(
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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_ChaindeclusterConfigInfo_t *info = (RF_ChaindeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
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RF_SectorNum_t index_within_region, index_within_disk;
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RF_StripeNum_t sparing_region_id;
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int col_before_remap;
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*row = 0;
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if (!remap) {
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*col = SUID % raidPtr->numCol;
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*col = (*col + 1) % raidPtr->numCol;
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*diskSector = info->mirrorStripeOffset * raidPtr->Layout.sectorsPerStripeUnit;
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*diskSector += ( SUID / raidPtr->numCol ) * 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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sparing_region_id = SUID / info->stripeUnitsPerSparingRegion;
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index_within_region = SUID % info->stripeUnitsPerSparingRegion;
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index_within_disk = index_within_region / raidPtr->numCol;
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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_before_remap = SUID % raidPtr->numCol;
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if (index_within_disk < col_before_remap)
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*col = index_within_disk;
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else if (index_within_disk == raidPtr->numCol-2 ) {
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*col = (col_before_remap+2) % raidPtr->numCol;
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*diskSector -= raidPtr->Layout.sectorsPerStripeUnit;
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}
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else
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*col = (index_within_disk + 2) % raidPtr->numCol;
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}
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}
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void rf_IdentifyStripeChainDecluster(
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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_ChaindeclusterConfigInfo_t *info = (RF_ChaindeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
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RF_StripeNum_t SUID;
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RF_RowCol_t col;
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SUID = addr / raidPtr->Layout.sectorsPerStripeUnit;
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col = SUID % raidPtr->numCol;
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*outRow = 0;
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*diskids = info->stripeIdentifier[ col ];
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}
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void rf_MapSIDToPSIDChainDecluster(
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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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{
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*which_ru = 0;
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*psID = stripeID;
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}
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/******************************************************************************
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* select a graph to perform a single-stripe access
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*
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* Parameters: raidPtr - description of the physical array
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* type - type of operation (read or write) requested
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* asmap - logical & physical addresses for this access
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* createFunc - function to use to create the graph (return value)
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*****************************************************************************/
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void rf_RAIDCDagSelect(
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RF_Raid_t *raidPtr,
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RF_IoType_t type,
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RF_AccessStripeMap_t *asmap,
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RF_VoidFuncPtr *createFunc)
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#if 0
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void (**createFunc)(RF_Raid_t *, RF_AccessStripeMap_t *,
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RF_DagHeader_t *, void *, RF_RaidAccessFlags_t,
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RF_AllocListElem_t *))
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#endif
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{
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RF_ASSERT(RF_IO_IS_R_OR_W(type));
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RF_ASSERT(raidPtr->numRow == 1);
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if (asmap->numDataFailed + asmap->numParityFailed > 1) {
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RF_ERRORMSG("Multiple disks failed in a single group! Aborting I/O operation.\n");
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*createFunc = NULL;
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return;
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}
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*createFunc = (type == RF_IO_TYPE_READ) ? (RF_VoidFuncPtr)rf_CreateFaultFreeReadDAG :(RF_VoidFuncPtr) rf_CreateRaidOneWriteDAG;
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if (type == RF_IO_TYPE_READ) {
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if ( ( raidPtr->status[0] == rf_rs_degraded ) || ( raidPtr->status[0] == rf_rs_reconstructing) )
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*createFunc = (RF_VoidFuncPtr)rf_CreateRaidCDegradedReadDAG; /* array status is degraded, implement workload shifting */
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else
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*createFunc = (RF_VoidFuncPtr)rf_CreateMirrorPartitionReadDAG; /* array status not degraded, so use mirror partition dag */
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}
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else
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*createFunc = (RF_VoidFuncPtr)rf_CreateRaidOneWriteDAG;
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}
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