225 lines
6.8 KiB
C
225 lines
6.8 KiB
C
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/* $NetBSD: rf_raid4.c,v 1.1 1998/11/13 04:20:33 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: Rachad Youssef
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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_raid4.c -- implements RAID Level 4
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*
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***************************************/
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/*
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* :
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* Log: rf_raid4.c,v
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* Revision 1.24 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 1.23 1996/07/18 22:57:14 jimz
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* port simulator to AIX
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*
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* Revision 1.22 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 1.21 1996/06/11 08:54:27 jimz
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* improved error-checking at configuration time
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*
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* Revision 1.20 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 1.19 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 1.18 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 1.17 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 1.16 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 1.15 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 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 1.13 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 1.12 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 1.11 1996/05/03 19:39:41 wvcii
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* added includes for dag library
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*
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* Revision 1.10 1995/12/12 18:10:06 jimz
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* MIN -> RF_MIN, MAX -> RF_MAX, ASSERT -> RF_ASSERT
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* fix 80-column brain damage in comments
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*
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* Revision 1.9 1995/12/06 15:02:46 root
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* added copyright info
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*
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* Revision 1.8 1995/11/17 18:57:32 wvcii
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* added prototyping to MapParity
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*
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* Revision 1.7 1995/06/23 13:38:58 robby
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* updeated to prototypes in rf_layout.h
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*
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*/
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#include "rf_raid.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_dagffrd.h"
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#include "rf_dagffwr.h"
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#include "rf_dagdegrd.h"
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#include "rf_dagdegwr.h"
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#include "rf_threadid.h"
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#include "rf_raid4.h"
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#include "rf_general.h"
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typedef struct RF_Raid4ConfigInfo_s {
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RF_RowCol_t *stripeIdentifier; /* filled in at config time & used by IdentifyStripe */
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} RF_Raid4ConfigInfo_t;
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int rf_ConfigureRAID4(
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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_Raid4ConfigInfo_t *info;
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int i;
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/* create a RAID level 4 configuration structure ... */
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RF_MallocAndAdd(info, sizeof(RF_Raid4ConfigInfo_t), (RF_Raid4ConfigInfo_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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/* ... and fill it in. */
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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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/* fill in the remaining layout parameters */
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layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
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layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector;
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layoutPtr->numDataCol = raidPtr->numCol-1;
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layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
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layoutPtr->numParityCol = 1;
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raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
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return(0);
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}
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int rf_GetDefaultNumFloatingReconBuffersRAID4(RF_Raid_t *raidPtr)
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{
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return(20);
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}
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RF_HeadSepLimit_t rf_GetDefaultHeadSepLimitRAID4(RF_Raid_t *raidPtr)
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{
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return(20);
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}
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void rf_MapSectorRAID4(
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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_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
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*row = 0;
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*col = SUID % raidPtr->Layout.numDataCol;
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*diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit +
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(raidSector % raidPtr->Layout.sectorsPerStripeUnit);
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}
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void rf_MapParityRAID4(
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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_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
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*row = 0;
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*col = raidPtr->Layout.numDataCol;
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*diskSector =(SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit +
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(raidSector % raidPtr->Layout.sectorsPerStripeUnit);
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}
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void rf_IdentifyStripeRAID4(
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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_Raid4ConfigInfo_t *info = raidPtr->Layout.layoutSpecificInfo;
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*outRow = 0;
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*diskids = info->stripeIdentifier;
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}
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void rf_MapSIDToPSIDRAID4(
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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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