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NetBSD/sys/dev/raidframe/rf_raid5_rotatedspare.c

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/* $NetBSD: rf_raid5_rotatedspare.c,v 1.1 1998/11/13 04:20:33 oster Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Khalil Amiri
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
/**************************************************************************
*
* rf_raid5_rotated_spare.c -- implements RAID Level 5 with rotated sparing
*
**************************************************************************/
/* :
* Log: rf_raid5_rotatedspare.c,v
* Revision 1.22 1996/07/31 16:56:18 jimz
* dataBytesPerStripe, sectorsPerDisk init arch-indep.
*
* Revision 1.21 1996/07/29 14:05:12 jimz
* fix numPUs/numRUs confusion (everything is now numRUs)
* clean up some commenting, return values
*
* Revision 1.20 1996/07/18 22:57:14 jimz
* port simulator to AIX
*
* Revision 1.19 1996/07/13 00:00:59 jimz
* sanitized generalized reconstruction architecture
* cleaned up head sep, rbuf problems
*
* Revision 1.18 1996/06/19 17:53:48 jimz
* move GetNumSparePUs, InstallSpareTable ops into layout switch
*
* Revision 1.17 1996/06/11 08:54:27 jimz
* improved error-checking at configuration time
*
* Revision 1.16 1996/06/10 11:55:47 jimz
* Straightened out some per-array/not-per-array distinctions, fixed
* a couple bugs related to confusion. Added shutdown lists. Removed
* layout shutdown function (now subsumed by shutdown lists).
*
* Revision 1.15 1996/06/07 22:26:27 jimz
* type-ify which_ru (RF_ReconUnitNum_t)
*
* Revision 1.14 1996/06/07 21:33:04 jimz
* begin using consistent types for sector numbers,
* stripe numbers, row+col numbers, recon unit numbers
*
* Revision 1.13 1996/06/03 23:28:26 jimz
* more bugfixes
* check in tree to sync for IPDS runs with current bugfixes
* there still may be a problem with threads in the script test
* getting I/Os stuck- not trivially reproducible (runs ~50 times
* in a row without getting stuck)
*
* Revision 1.12 1996/06/02 17:31:48 jimz
* Moved a lot of global stuff into array structure, where it belongs.
* Fixed up paritylogging, pss modules in this manner. Some general
* code cleanup. Removed lots of dead code, some dead files.
*
* Revision 1.11 1996/05/31 22:26:54 jimz
* fix a lot of mapping problems, memory allocation problems
* found some weird lock issues, fixed 'em
* more code cleanup
*
* Revision 1.10 1996/05/27 18:56:37 jimz
* more code cleanup
* better typing
* compiles in all 3 environments
*
* Revision 1.9 1996/05/24 01:59:45 jimz
* another checkpoint in code cleanup for release
* time to sync kernel tree
*
* Revision 1.8 1996/05/23 00:33:23 jimz
* code cleanup: move all debug decls to rf_options.c, all extern
* debug decls to rf_options.h, all debug vars preceded by rf_
*
* Revision 1.7 1996/05/18 19:51:34 jimz
* major code cleanup- fix syntax, make some types consistent,
* add prototypes, clean out dead code, et cetera
*
* Revision 1.6 1996/05/03 19:48:36 wvcii
* removed include of rf_redstripe.h
*
* Revision 1.5 1995/12/12 18:10:06 jimz
* MIN -> RF_MIN, MAX -> RF_MAX, ASSERT -> RF_ASSERT
* fix 80-column brain damage in comments
*
* Revision 1.4 1995/12/06 15:05:53 root
* added copyright info
*
* Revision 1.3 1995/11/19 21:26:29 amiri
* Added an assert to make sure numCol >= 3
*
* Revision 1.2 1995/11/17 19:03:18 wvcii
* added prototyping to MapParity
*
*/
#include "rf_raid.h"
#include "rf_raid5.h"
#include "rf_dag.h"
#include "rf_dagutils.h"
#include "rf_dagfuncs.h"
#include "rf_threadid.h"
#include "rf_general.h"
#include "rf_utils.h"
#include "rf_raid5_rotatedspare.h"
typedef struct RF_Raid5RSConfigInfo_s {
RF_RowCol_t **stripeIdentifier; /* filled in at config time & used by IdentifyStripe */
} RF_Raid5RSConfigInfo_t;
int rf_ConfigureRAID5_RS(
RF_ShutdownList_t **listp,
RF_Raid_t *raidPtr,
RF_Config_t *cfgPtr)
{
RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
RF_Raid5RSConfigInfo_t *info;
RF_RowCol_t i, j, startdisk;
/* create a RAID level 5 configuration structure */
RF_MallocAndAdd(info, sizeof(RF_Raid5RSConfigInfo_t), (RF_Raid5RSConfigInfo_t *), raidPtr->cleanupList);
if (info == NULL)
return(ENOMEM);
layoutPtr->layoutSpecificInfo = (void *) info;
RF_ASSERT(raidPtr->numRow == 1);
RF_ASSERT(raidPtr->numCol >= 3);
/* the stripe identifier must identify the disks in each stripe,
* IN THE ORDER THAT THEY APPEAR IN THE STRIPE.
*/
info->stripeIdentifier = rf_make_2d_array(raidPtr->numCol, raidPtr->numCol, raidPtr->cleanupList);
if (info->stripeIdentifier == NULL)
return(ENOMEM);
startdisk = 0;
for (i=0; i<raidPtr->numCol; i++) {
for (j=0; j<raidPtr->numCol; j++) {
info->stripeIdentifier[i][j] = (startdisk + j) % raidPtr->numCol;
}
if ((--startdisk) < 0) startdisk = raidPtr->numCol-1;
}
/* fill in the remaining layout parameters */
layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector;
layoutPtr->numDataCol = raidPtr->numCol-2;
layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
layoutPtr->numParityCol = 1;
layoutPtr->dataStripeUnitsPerDisk = layoutPtr->stripeUnitsPerDisk;
raidPtr->sectorsPerDisk = layoutPtr->stripeUnitsPerDisk * layoutPtr->sectorsPerStripeUnit;
raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
return(0);
}
RF_ReconUnitCount_t rf_GetNumSpareRUsRAID5_RS(raidPtr)
RF_Raid_t *raidPtr;
{
return ( raidPtr->Layout.stripeUnitsPerDisk / raidPtr->numCol );
}
void rf_MapSectorRAID5_RS(
RF_Raid_t *raidPtr,
RF_RaidAddr_t raidSector,
RF_RowCol_t *row,
RF_RowCol_t *col,
RF_SectorNum_t *diskSector,
int remap)
{
RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
*row = 0;
if (remap) {
*col = raidPtr->numCol-1-(1+SUID/raidPtr->Layout.numDataCol)%raidPtr->numCol;
*col = (*col+1)%raidPtr->numCol; /*spare unit is rotated with parity; line above maps to parity */
}
else {
*col = ( SUID + (SUID/raidPtr->Layout.numDataCol) ) % raidPtr->numCol;
}
*diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit +
(raidSector % raidPtr->Layout.sectorsPerStripeUnit);
}
void rf_MapParityRAID5_RS(
RF_Raid_t *raidPtr,
RF_RaidAddr_t raidSector,
RF_RowCol_t *row,
RF_RowCol_t *col,
RF_SectorNum_t *diskSector,
int remap)
{
RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
*row = 0;
*col = raidPtr->numCol-1-(1+SUID/raidPtr->Layout.numDataCol)%raidPtr->numCol;
*diskSector =(SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit +
(raidSector % raidPtr->Layout.sectorsPerStripeUnit);
if (remap)
*col = (*col+1)%raidPtr->numCol;
}
void rf_IdentifyStripeRAID5_RS(
RF_Raid_t *raidPtr,
RF_RaidAddr_t addr,
RF_RowCol_t **diskids,
RF_RowCol_t *outRow)
{
RF_StripeNum_t stripeID = rf_RaidAddressToStripeID(&raidPtr->Layout, addr);
RF_Raid5RSConfigInfo_t *info = (RF_Raid5RSConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
*outRow = 0;
*diskids = info->stripeIdentifier[ stripeID % raidPtr->numCol ];
}
void rf_MapSIDToPSIDRAID5_RS(
RF_RaidLayout_t *layoutPtr,
RF_StripeNum_t stripeID,
RF_StripeNum_t *psID,
RF_ReconUnitNum_t *which_ru)
{
*which_ru = 0;
*psID = stripeID;
}
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