491 lines
13 KiB
C
491 lines
13 KiB
C
/* $NetBSD: rf_layout.c,v 1.20 2008/05/04 20:57:23 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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/* rf_layout.c -- driver code dealing with layout and mapping issues
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: rf_layout.c,v 1.20 2008/05/04 20:57:23 oster Exp $");
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#include <dev/raidframe/raidframevar.h>
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#include "rf_archs.h"
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#include "rf_raid.h"
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#include "rf_dag.h"
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#include "rf_desc.h"
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#include "rf_decluster.h"
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#include "rf_pq.h"
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#include "rf_declusterPQ.h"
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#include "rf_raid0.h"
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#include "rf_raid1.h"
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#include "rf_raid4.h"
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#include "rf_raid5.h"
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#include "rf_states.h"
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#if RF_INCLUDE_RAID5_RS > 0
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#include "rf_raid5_rotatedspare.h"
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#endif /* RF_INCLUDE_RAID5_RS > 0 */
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#if RF_INCLUDE_CHAINDECLUSTER > 0
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#include "rf_chaindecluster.h"
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#endif /* RF_INCLUDE_CHAINDECLUSTER > 0 */
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#if RF_INCLUDE_INTERDECLUSTER > 0
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#include "rf_interdecluster.h"
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#endif /* RF_INCLUDE_INTERDECLUSTER > 0 */
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#if RF_INCLUDE_PARITYLOGGING > 0
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#include "rf_paritylogging.h"
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#endif /* RF_INCLUDE_PARITYLOGGING > 0 */
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#if RF_INCLUDE_EVENODD > 0
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#include "rf_evenodd.h"
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#endif /* RF_INCLUDE_EVENODD > 0 */
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#include "rf_general.h"
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#include "rf_driver.h"
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#include "rf_parityscan.h"
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#include "rf_reconbuffer.h"
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#include "rf_reconutil.h"
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/***********************************************************************
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*
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* the layout switch defines all the layouts that are supported.
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* fields are: layout ID, init routine, shutdown routine, map
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* sector, map parity, identify stripe, dag selection, map stripeid
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* to parity stripe id (optional), num faults tolerated, special
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* flags.
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*
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***********************************************************************/
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static const RF_AccessState_t DefaultStates[] = {
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rf_QuiesceState,
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rf_IncrAccessesCountState,
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rf_MapState,
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rf_LockState,
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rf_CreateDAGState,
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rf_ExecuteDAGState,
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rf_ProcessDAGState,
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rf_CleanupState,
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rf_DecrAccessesCountState,
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rf_LastState};
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#define RF_NU(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p
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/* Note that if you add any new RAID types to this list, that you must
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also update the mapsw[] table in the raidctl sources */
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static const RF_LayoutSW_t mapsw[] = {
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#if RF_INCLUDE_PARITY_DECLUSTERING > 0
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/* parity declustering */
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{'T', "Parity declustering",
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RF_NU(
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rf_ConfigureDeclustered,
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rf_MapSectorDeclustered, rf_MapParityDeclustered, NULL,
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rf_IdentifyStripeDeclustered,
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rf_RaidFiveDagSelect,
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rf_MapSIDToPSIDDeclustered,
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rf_GetDefaultHeadSepLimitDeclustered,
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rf_GetDefaultNumFloatingReconBuffersDeclustered,
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NULL, NULL,
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rf_SubmitReconBufferBasic,
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rf_VerifyParityBasic,
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1,
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DefaultStates,
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0)
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},
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#endif
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#if RF_INCLUDE_PARITY_DECLUSTERING_DS > 0
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/* parity declustering with distributed sparing */
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{'D', "Distributed sparing parity declustering",
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RF_NU(
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rf_ConfigureDeclusteredDS,
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rf_MapSectorDeclustered, rf_MapParityDeclustered, NULL,
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rf_IdentifyStripeDeclustered,
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rf_RaidFiveDagSelect,
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rf_MapSIDToPSIDDeclustered,
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rf_GetDefaultHeadSepLimitDeclustered,
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rf_GetDefaultNumFloatingReconBuffersDeclustered,
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rf_GetNumSpareRUsDeclustered, rf_InstallSpareTable,
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rf_SubmitReconBufferBasic,
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rf_VerifyParityBasic,
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1,
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DefaultStates,
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RF_DISTRIBUTE_SPARE | RF_BD_DECLUSTERED)
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},
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#endif
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#if RF_INCLUDE_DECL_PQ > 0
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/* declustered P+Q */
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{'Q', "Declustered P+Q",
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RF_NU(
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rf_ConfigureDeclusteredPQ,
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rf_MapSectorDeclusteredPQ, rf_MapParityDeclusteredPQ, rf_MapQDeclusteredPQ,
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rf_IdentifyStripeDeclusteredPQ,
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rf_PQDagSelect,
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rf_MapSIDToPSIDDeclustered,
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rf_GetDefaultHeadSepLimitDeclustered,
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rf_GetDefaultNumFloatingReconBuffersPQ,
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NULL, NULL,
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NULL,
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rf_VerifyParityBasic,
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2,
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DefaultStates,
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0)
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},
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#endif /* RF_INCLUDE_DECL_PQ > 0 */
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#if RF_INCLUDE_RAID5_RS > 0
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/* RAID 5 with rotated sparing */
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{'R', "RAID Level 5 rotated sparing",
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RF_NU(
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rf_ConfigureRAID5_RS,
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rf_MapSectorRAID5_RS, rf_MapParityRAID5_RS, NULL,
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rf_IdentifyStripeRAID5_RS,
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rf_RaidFiveDagSelect,
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rf_MapSIDToPSIDRAID5_RS,
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rf_GetDefaultHeadSepLimitRAID5,
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rf_GetDefaultNumFloatingReconBuffersRAID5,
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rf_GetNumSpareRUsRAID5_RS, NULL,
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rf_SubmitReconBufferBasic,
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rf_VerifyParityBasic,
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1,
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DefaultStates,
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RF_DISTRIBUTE_SPARE)
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},
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#endif /* RF_INCLUDE_RAID5_RS > 0 */
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#if RF_INCLUDE_CHAINDECLUSTER > 0
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/* Chained Declustering */
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{'C', "Chained Declustering",
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RF_NU(
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rf_ConfigureChainDecluster,
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rf_MapSectorChainDecluster, rf_MapParityChainDecluster, NULL,
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rf_IdentifyStripeChainDecluster,
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rf_RAIDCDagSelect,
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rf_MapSIDToPSIDChainDecluster,
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NULL,
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NULL,
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rf_GetNumSpareRUsChainDecluster, NULL,
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rf_SubmitReconBufferBasic,
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rf_VerifyParityBasic,
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1,
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DefaultStates,
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0)
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},
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#endif /* RF_INCLUDE_CHAINDECLUSTER > 0 */
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#if RF_INCLUDE_INTERDECLUSTER > 0
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/* Interleaved Declustering */
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{'I', "Interleaved Declustering",
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RF_NU(
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rf_ConfigureInterDecluster,
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rf_MapSectorInterDecluster, rf_MapParityInterDecluster, NULL,
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rf_IdentifyStripeInterDecluster,
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rf_RAIDIDagSelect,
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rf_MapSIDToPSIDInterDecluster,
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rf_GetDefaultHeadSepLimitInterDecluster,
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rf_GetDefaultNumFloatingReconBuffersInterDecluster,
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rf_GetNumSpareRUsInterDecluster, NULL,
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rf_SubmitReconBufferBasic,
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rf_VerifyParityBasic,
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1,
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DefaultStates,
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RF_DISTRIBUTE_SPARE)
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},
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#endif /* RF_INCLUDE_INTERDECLUSTER > 0 */
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#if RF_INCLUDE_RAID0 > 0
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/* RAID level 0 */
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{'0', "RAID Level 0",
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RF_NU(
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rf_ConfigureRAID0,
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rf_MapSectorRAID0, rf_MapParityRAID0, NULL,
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rf_IdentifyStripeRAID0,
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rf_RAID0DagSelect,
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rf_MapSIDToPSIDRAID0,
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NULL,
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NULL,
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NULL, NULL,
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NULL,
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rf_VerifyParityRAID0,
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0,
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DefaultStates,
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0)
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},
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#endif /* RF_INCLUDE_RAID0 > 0 */
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#if RF_INCLUDE_RAID1 > 0
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/* RAID level 1 */
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{'1', "RAID Level 1",
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RF_NU(
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rf_ConfigureRAID1,
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rf_MapSectorRAID1, rf_MapParityRAID1, NULL,
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rf_IdentifyStripeRAID1,
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rf_RAID1DagSelect,
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rf_MapSIDToPSIDRAID1,
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rf_GetDefaultHeadSepLimitRAID1,
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NULL,
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NULL, NULL,
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rf_SubmitReconBufferRAID1,
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rf_VerifyParityRAID1,
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1,
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DefaultStates,
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0)
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},
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#endif /* RF_INCLUDE_RAID1 > 0 */
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#if RF_INCLUDE_RAID4 > 0
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/* RAID level 4 */
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{'4', "RAID Level 4",
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RF_NU(
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rf_ConfigureRAID4,
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rf_MapSectorRAID4, rf_MapParityRAID4, NULL,
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rf_IdentifyStripeRAID4,
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rf_RaidFiveDagSelect,
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rf_MapSIDToPSIDRAID4,
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rf_GetDefaultHeadSepLimitRAID4,
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rf_GetDefaultNumFloatingReconBuffersRAID4,
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NULL, NULL,
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rf_SubmitReconBufferBasic,
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rf_VerifyParityBasic,
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1,
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DefaultStates,
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0)
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},
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#endif /* RF_INCLUDE_RAID4 > 0 */
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#if RF_INCLUDE_RAID5 > 0
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/* RAID level 5 */
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{'5', "RAID Level 5",
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RF_NU(
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rf_ConfigureRAID5,
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rf_MapSectorRAID5, rf_MapParityRAID5, NULL,
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rf_IdentifyStripeRAID5,
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rf_RaidFiveDagSelect,
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rf_MapSIDToPSIDRAID5,
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rf_GetDefaultHeadSepLimitRAID5,
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rf_GetDefaultNumFloatingReconBuffersRAID5,
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NULL, NULL,
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rf_SubmitReconBufferBasic,
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rf_VerifyParityBasic,
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1,
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DefaultStates,
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0)
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},
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#endif /* RF_INCLUDE_RAID5 > 0 */
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#if RF_INCLUDE_EVENODD > 0
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/* Evenodd */
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{'E', "EvenOdd",
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RF_NU(
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rf_ConfigureEvenOdd,
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rf_MapSectorRAID5, rf_MapParityEvenOdd, rf_MapEEvenOdd,
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rf_IdentifyStripeEvenOdd,
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rf_EODagSelect,
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rf_MapSIDToPSIDRAID5,
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NULL,
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NULL,
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NULL, NULL,
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NULL, /* no reconstruction, yet */
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rf_VerifyParityEvenOdd,
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2,
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DefaultStates,
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0)
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},
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#endif /* RF_INCLUDE_EVENODD > 0 */
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#if RF_INCLUDE_EVENODD > 0
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/* Declustered Evenodd */
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{'e', "Declustered EvenOdd",
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RF_NU(
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rf_ConfigureDeclusteredPQ,
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rf_MapSectorDeclusteredPQ, rf_MapParityDeclusteredPQ, rf_MapQDeclusteredPQ,
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rf_IdentifyStripeDeclusteredPQ,
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rf_EODagSelect,
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rf_MapSIDToPSIDRAID5,
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rf_GetDefaultHeadSepLimitDeclustered,
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rf_GetDefaultNumFloatingReconBuffersPQ,
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NULL, NULL,
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NULL, /* no reconstruction, yet */
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rf_VerifyParityEvenOdd,
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2,
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DefaultStates,
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0)
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},
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#endif /* RF_INCLUDE_EVENODD > 0 */
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#if RF_INCLUDE_PARITYLOGGING > 0
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/* parity logging */
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{'L', "Parity logging",
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RF_NU(
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rf_ConfigureParityLogging,
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rf_MapSectorParityLogging, rf_MapParityParityLogging, NULL,
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rf_IdentifyStripeParityLogging,
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rf_ParityLoggingDagSelect,
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rf_MapSIDToPSIDParityLogging,
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rf_GetDefaultHeadSepLimitParityLogging,
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rf_GetDefaultNumFloatingReconBuffersParityLogging,
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NULL, NULL,
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rf_SubmitReconBufferBasic,
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NULL,
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1,
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DefaultStates,
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0)
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},
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#endif /* RF_INCLUDE_PARITYLOGGING > 0 */
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/* end-of-list marker */
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{'\0', NULL,
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RF_NU(
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NULL,
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NULL, NULL, NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL,
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NULL, NULL,
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NULL,
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NULL,
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0,
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NULL,
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0)
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}
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};
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const RF_LayoutSW_t *
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rf_GetLayout(RF_ParityConfig_t parityConfig)
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{
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const RF_LayoutSW_t *p;
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/* look up the specific layout */
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for (p = &mapsw[0]; p->parityConfig; p++)
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if (p->parityConfig == parityConfig)
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break;
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if (!p->parityConfig)
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return (NULL);
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RF_ASSERT(p->parityConfig == parityConfig);
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return (p);
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}
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/*****************************************************************************
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*
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* ConfigureLayout --
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*
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* read the configuration file and set up the RAID layout parameters.
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* After reading common params, invokes the layout-specific
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* configuration routine to finish the configuration.
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*
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****************************************************************************/
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int
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rf_ConfigureLayout(RF_ShutdownList_t **listp, 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_ParityConfig_t parityConfig;
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const RF_LayoutSW_t *p;
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int retval;
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layoutPtr->sectorsPerStripeUnit = cfgPtr->sectPerSU;
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layoutPtr->SUsPerPU = cfgPtr->SUsPerPU;
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layoutPtr->SUsPerRU = cfgPtr->SUsPerRU;
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parityConfig = cfgPtr->parityConfig;
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if (layoutPtr->sectorsPerStripeUnit <= 0) {
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RF_ERRORMSG2("raid%d: Invalid sectorsPerStripeUnit: %d\n",
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raidPtr->raidid,
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(int)layoutPtr->sectorsPerStripeUnit);
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return (EINVAL);
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}
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if (layoutPtr->SUsPerPU <= 0) {
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RF_ERRORMSG2("raid%d: Invalid StripeUnitsPerParityUnit: %d\n",
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raidPtr->raidid,
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(int)layoutPtr->SUsPerPU);
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return (EINVAL);
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}
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if (layoutPtr->SUsPerRU <= 0) {
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RF_ERRORMSG2("raid%d: Invalid StripeUnitsPerReconstructUnit: %d\n",
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raidPtr->raidid,
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(int)layoutPtr->SUsPerRU);
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return (EINVAL);
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}
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layoutPtr->stripeUnitsPerDisk = raidPtr->sectorsPerDisk / layoutPtr->sectorsPerStripeUnit;
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p = rf_GetLayout(parityConfig);
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if (p == NULL) {
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RF_ERRORMSG1("Unknown parity configuration '%c'", parityConfig);
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return (EINVAL);
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}
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RF_ASSERT(p->parityConfig == parityConfig);
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layoutPtr->map = p;
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/* initialize the specific layout */
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retval = (p->Configure) (listp, raidPtr, cfgPtr);
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if (retval)
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return (retval);
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raidPtr->sectorsPerDisk = layoutPtr->stripeUnitsPerDisk * layoutPtr->sectorsPerStripeUnit;
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if (rf_forceNumFloatingReconBufs >= 0) {
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raidPtr->numFloatingReconBufs = rf_forceNumFloatingReconBufs;
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} else {
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raidPtr->numFloatingReconBufs = rf_GetDefaultNumFloatingReconBuffers(raidPtr);
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}
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if (rf_forceHeadSepLimit >= 0) {
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raidPtr->headSepLimit = rf_forceHeadSepLimit;
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} else {
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raidPtr->headSepLimit = rf_GetDefaultHeadSepLimit(raidPtr);
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}
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return (0);
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}
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/* typically there is a 1-1 mapping between stripes and parity stripes.
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* however, the declustering code supports packing multiple stripes into
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* a single parity stripe, so as to increase the size of the reconstruction
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* unit without affecting the size of the stripe unit. This routine finds
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* the parity stripe identifier associated with a stripe ID. There is also
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* a RaidAddressToParityStripeID macro in layout.h
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*/
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RF_StripeNum_t
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rf_MapStripeIDToParityStripeID(RF_RaidLayout_t *layoutPtr,
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RF_StripeNum_t stripeID,
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RF_ReconUnitNum_t *which_ru)
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{
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RF_StripeNum_t parityStripeID;
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/* quick exit in the common case of SUsPerPU==1 */
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if ((layoutPtr->SUsPerPU == 1) || !layoutPtr->map->MapSIDToPSID) {
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*which_ru = 0;
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return (stripeID);
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} else {
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(layoutPtr->map->MapSIDToPSID) (layoutPtr, stripeID, &parityStripeID, which_ru);
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}
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return (parityStripeID);
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}
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