24b034a69e
~forever. This requires a number of things:
1) If we can't create a DAG, set desc->numStripes to 0 in
rf_SelectAlgorithm. This will ensure that we don't attempt to free
any dagArray[] elements in rf_StateCleanup.
2) Modify rf_State_CreateDAG() to not panic in the event of a DAG
failure. Instead, set the bp->b_flags and bp->b_error, and set things
up to skip to rf_State_Cleanup().
3) Need to mark desc->status as "bad" so that we actually stop looking
for a different DAG. (which we won't find... no matter how many times
we try).
4) rf_State_LastState() will then do the biodone(), and return EIO for
the IO in question.
5) Remove some " || 1 "'s from ProcessNode(). These were for
debugging, and we don't need the failure notices spewing
over and over again as the failing DAGs are processed.
6) Needed to change
if (asmap->numDataFailed + asmap->numParityFailed > 1)
to
if ((asmap->numDataFailed + asmap->numParityFailed > 1) ||
(raidPtr->numFailures > 1)){
in rf_raid5.c so that it doesn't try to return
rf_CreateNonRedundantWriteDAG as the creation function.
7) Note that we can't apply the above change to the RAID 1 code as
with the silly "fake 2-D" RAID 1 sets, it is possible to have 2 failed
components in the RAID 1 set, and that would stop them from working.
(I really don't know why/how those "fake 2-D" RAID 1 sets even work
with all the "single-fault" assumptions present in the rest of the
code.)
8) Needed to protect rf_RAID0DagSelect() in a similar way -- it should
return NULL as the createFunc.
9) No point printing out "Multiple disks failed..." a zillion times.
144 lines
4.2 KiB
C
144 lines
4.2 KiB
C
/* $NetBSD: rf_raid0.c,v 1.10 2004/01/02 21:41:08 oster Exp $ */
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/*
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* Copyright (c) 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Mark Holland
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/***************************************
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*
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* rf_raid0.c -- implements RAID Level 0
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*
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***************************************/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: rf_raid0.c,v 1.10 2004/01/02 21:41:08 oster Exp $");
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#include <dev/raidframe/raidframevar.h>
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#include "rf_raid.h"
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#include "rf_raid0.h"
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#include "rf_dag.h"
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#include "rf_dagffrd.h"
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#include "rf_dagffwr.h"
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#include "rf_dagutils.h"
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#include "rf_dagfuncs.h"
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#include "rf_general.h"
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#include "rf_parityscan.h"
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typedef struct RF_Raid0ConfigInfo_s {
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RF_RowCol_t *stripeIdentifier;
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} RF_Raid0ConfigInfo_t;
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int
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rf_ConfigureRAID0(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_Raid0ConfigInfo_t *info;
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RF_RowCol_t i;
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/* create a RAID level 0 configuration structure */
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RF_MallocAndAdd(info, sizeof(RF_Raid0ConfigInfo_t), (RF_Raid0ConfigInfo_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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RF_MallocAndAdd(info->stripeIdentifier, raidPtr->numCol * sizeof(RF_RowCol_t), (RF_RowCol_t *), 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] = i;
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RF_ASSERT(raidPtr->numRow == 1);
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raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
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layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
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layoutPtr->dataSectorsPerStripe = raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
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layoutPtr->numDataCol = raidPtr->numCol;
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layoutPtr->numParityCol = 0;
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return (0);
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}
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void
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rf_MapSectorRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
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RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
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{
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RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
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*col = SUID % raidPtr->numCol;
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*diskSector = (SUID / raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit +
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(raidSector % raidPtr->Layout.sectorsPerStripeUnit);
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}
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void
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rf_MapParityRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
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RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
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{
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*col = 0;
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*diskSector = 0;
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}
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void
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rf_IdentifyStripeRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t addr,
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RF_RowCol_t **diskids)
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{
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RF_Raid0ConfigInfo_t *info;
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info = raidPtr->Layout.layoutSpecificInfo;
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*diskids = info->stripeIdentifier;
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}
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void
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rf_MapSIDToPSIDRAID0(RF_RaidLayout_t *layoutPtr, RF_StripeNum_t stripeID,
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RF_StripeNum_t *psID, 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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void
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rf_RAID0DagSelect(
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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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{
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if (raidPtr->numFailures > 0) {
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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) ?
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(RF_VoidFuncPtr) rf_CreateFaultFreeReadDAG : (RF_VoidFuncPtr) rf_CreateRAID0WriteDAG);
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}
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int
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rf_VerifyParityRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t raidAddr,
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RF_PhysDiskAddr_t *parityPDA, int correct_it,
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RF_RaidAccessFlags_t flags)
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{
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/*
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* No parity is always okay.
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*/
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return (RF_PARITY_OKAY);
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}
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