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NetBSD/sys/dev/raidframe/rf_interdecluster.c

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/* $NetBSD: rf_interdecluster.c,v 1.1 1998/11/13 04:20:30 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_interdecluster.c -- implements interleaved declustering
*
************************************************************/
/* :
* Log: rf_interdecluster.c,v
* Revision 1.24 1996/08/02 13:20:38 jimz
* get rid of bogus (long) casts
*
* Revision 1.23 1996/07/31 16:56:18 jimz
* dataBytesPerStripe, sectorsPerDisk init arch-indep.
*
* Revision 1.22 1996/07/29 14:05:12 jimz
* fix numPUs/numRUs confusion (everything is now numRUs)
* clean up some commenting, return values
*
* Revision 1.21 1996/07/22 19:52:16 jimz
* switched node params to RF_DagParam_t, a union of
* a 64-bit int and a void *, for better portability
* attempted hpux port, but failed partway through for
* lack of a single C compiler capable of compiling all
* source files
*
* 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 15:17:55 wvcii
* added include of rf_interdecluster.h
* fixed parameter list of rf_ConfigureInterDecluster
* fixed return type of rf_GetNumSparePUsInterDecluster
* removed include of rf_raid1.h
*
* Revision 1.16 1996/06/11 08:55:15 jimz
* improved error-checking at configuration time
*
* Revision 1.15 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 1.14 1996/06/07 22:26:27 jimz
* type-ify which_ru (RF_ReconUnitNum_t)
*
* Revision 1.13 1996/06/07 21:33:04 jimz
* begin using consistent types for sector numbers,
* stripe numbers, row+col numbers, recon unit numbers
*
* Revision 1.12 1996/06/06 18:41:48 jimz
* add interleaved declustering dag selection
*
* Revision 1.11 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 1.10 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 1.9 1996/05/31 05:03:01 amiri
* fixed a bug related to sparing layout.
*
* Revision 1.8 1996/05/27 18:56:37 jimz
* more code cleanup
* better typing
* compiles in all 3 environments
*
* Revision 1.7 1996/05/24 01:59:45 jimz
* another checkpoint in code cleanup for release
* time to sync kernel tree
*
* Revision 1.6 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 1.5 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 1.4 1996/05/03 19:50:38 wvcii
* removed include of rf_redstripe.h
* fixed change log parameters in header
*
*/
#include "rf_types.h"
#include "rf_raid.h"
#include "rf_interdecluster.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_dagffrd.h"
#include "rf_dagdegrd.h"
#include "rf_dagffwr.h"
#include "rf_dagdegwr.h"
typedef struct RF_InterdeclusterConfigInfo_s {
RF_RowCol_t **stripeIdentifier; /* filled in at config time
* and used by IdentifyStripe */
RF_StripeCount_t numSparingRegions;
RF_StripeCount_t stripeUnitsPerSparingRegion;
RF_SectorNum_t mirrorStripeOffset;
} RF_InterdeclusterConfigInfo_t;
int rf_ConfigureInterDecluster(
RF_ShutdownList_t **listp,
RF_Raid_t *raidPtr,
RF_Config_t *cfgPtr)
{
RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
RF_StripeCount_t num_used_stripeUnitsPerDisk;
RF_InterdeclusterConfigInfo_t *info;
RF_RowCol_t i, tmp, SUs_per_region;
/* create an Interleaved Declustering configuration structure */
RF_MallocAndAdd(info, sizeof(RF_InterdeclusterConfigInfo_t), (RF_InterdeclusterConfigInfo_t *),
raidPtr->cleanupList);
if (info == NULL)
return(ENOMEM);
layoutPtr->layoutSpecificInfo = (void *) info;
/* fill in the config structure. */
SUs_per_region = raidPtr->numCol * (raidPtr->numCol - 1);
info->stripeIdentifier = rf_make_2d_array(SUs_per_region, 2 , raidPtr->cleanupList);
if (info->stripeIdentifier == NULL)
return(ENOMEM);
for (i=0; i< SUs_per_region; i++) {
info->stripeIdentifier[i][0] = i / (raidPtr->numCol-1);
tmp = i / raidPtr->numCol;
info->stripeIdentifier[i][1] = (i+1+tmp) % raidPtr->numCol;
}
/* no spare tables */
RF_ASSERT(raidPtr->numRow == 1);
/* fill in the remaining layout parameters */
/* total number of stripes should a multiple of 2*numCol: Each sparing region consists of
2*numCol stripes: n-1 primary copy, n-1 secondary copy and 2 for spare .. */
num_used_stripeUnitsPerDisk = layoutPtr->stripeUnitsPerDisk - (layoutPtr->stripeUnitsPerDisk %
(2*raidPtr->numCol) );
info->numSparingRegions = num_used_stripeUnitsPerDisk / (2*raidPtr->numCol);
/* this is in fact the number of stripe units (that are primary data copies) in the sparing region */
info->stripeUnitsPerSparingRegion = raidPtr->numCol * (raidPtr->numCol - 1);
info->mirrorStripeOffset = info->numSparingRegions * (raidPtr->numCol+1);
layoutPtr->numStripe = info->numSparingRegions * info->stripeUnitsPerSparingRegion;
layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector;
layoutPtr->numDataCol = 1;
layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
layoutPtr->numParityCol = 1;
layoutPtr->dataStripeUnitsPerDisk = num_used_stripeUnitsPerDisk;
raidPtr->sectorsPerDisk =
num_used_stripeUnitsPerDisk * layoutPtr->sectorsPerStripeUnit;
raidPtr->totalSectors =
(layoutPtr->numStripe) * layoutPtr->sectorsPerStripeUnit;
layoutPtr->stripeUnitsPerDisk = raidPtr->sectorsPerDisk / layoutPtr->sectorsPerStripeUnit;
return(0);
}
int rf_GetDefaultNumFloatingReconBuffersInterDecluster(RF_Raid_t *raidPtr)
{
return(30);
}
RF_HeadSepLimit_t rf_GetDefaultHeadSepLimitInterDecluster(RF_Raid_t *raidPtr)
{
return(raidPtr->sectorsPerDisk);
}
RF_ReconUnitCount_t rf_GetNumSpareRUsInterDecluster(
RF_Raid_t *raidPtr)
{
RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
return ( 2 * ((RF_ReconUnitCount_t) info->numSparingRegions) );
/* the layout uses two stripe units per disk as spare within each sparing region */
}
/* Maps to the primary copy of the data, i.e. the first mirror pair */
void rf_MapSectorInterDecluster(
RF_Raid_t *raidPtr,
RF_RaidAddr_t raidSector,
RF_RowCol_t *row,
RF_RowCol_t *col,
RF_SectorNum_t *diskSector,
int remap)
{
RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
RF_StripeNum_t su_offset_into_disk, mirror_su_offset_into_disk;
RF_StripeNum_t sparing_region_id, index_within_region;
int col_before_remap;
*row = 0;
sparing_region_id = SUID / info->stripeUnitsPerSparingRegion;
index_within_region = SUID % info->stripeUnitsPerSparingRegion;
su_offset_into_disk = index_within_region % (raidPtr->numCol-1);
mirror_su_offset_into_disk = index_within_region / raidPtr->numCol;
col_before_remap = index_within_region / (raidPtr->numCol-1);
if (!remap) {
*col = col_before_remap;;
*diskSector = ( su_offset_into_disk + ( (raidPtr->numCol-1) * sparing_region_id) ) *
raidPtr->Layout.sectorsPerStripeUnit;
*diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
}
else {
/* remap sector to spare space...*/
*diskSector = sparing_region_id * (raidPtr->numCol+1) * raidPtr->Layout.sectorsPerStripeUnit;
*diskSector += (raidPtr->numCol-1) * raidPtr->Layout.sectorsPerStripeUnit;
*diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
*col = (index_within_region + 1 + mirror_su_offset_into_disk) % raidPtr->numCol;
*col = (*col + 1) % raidPtr->numCol;
if (*col == col_before_remap) *col = (*col + 1) % raidPtr->numCol;
}
}
/* Maps to the second copy of the mirror pair. */
void rf_MapParityInterDecluster(
RF_Raid_t *raidPtr,
RF_RaidAddr_t raidSector,
RF_RowCol_t *row,
RF_RowCol_t *col,
RF_SectorNum_t *diskSector,
int remap)
{
RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
RF_StripeNum_t sparing_region_id, index_within_region, mirror_su_offset_into_disk;
RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
int col_before_remap;
sparing_region_id = SUID / info->stripeUnitsPerSparingRegion;
index_within_region = SUID % info->stripeUnitsPerSparingRegion;
mirror_su_offset_into_disk = index_within_region / raidPtr->numCol;
col_before_remap = (index_within_region + 1 + mirror_su_offset_into_disk) % raidPtr->numCol;
*row = 0;
if (!remap) {
*col = col_before_remap;
*diskSector = info->mirrorStripeOffset * raidPtr->Layout.sectorsPerStripeUnit;
*diskSector += sparing_region_id * (raidPtr->numCol-1) * raidPtr->Layout.sectorsPerStripeUnit;
*diskSector += mirror_su_offset_into_disk * raidPtr->Layout.sectorsPerStripeUnit;
*diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
}
else {
/* remap parity to spare space ... */
*diskSector = sparing_region_id * (raidPtr->numCol+1) * raidPtr->Layout.sectorsPerStripeUnit;
*diskSector += (raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit;
*diskSector += (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
*col = index_within_region / (raidPtr->numCol-1);
*col = (*col + 1) % raidPtr->numCol;
if (*col == col_before_remap) *col = (*col + 1) % raidPtr->numCol;
}
}
void rf_IdentifyStripeInterDecluster(
RF_Raid_t *raidPtr,
RF_RaidAddr_t addr,
RF_RowCol_t **diskids,
RF_RowCol_t *outRow)
{
RF_InterdeclusterConfigInfo_t *info = (RF_InterdeclusterConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
RF_StripeNum_t SUID;
SUID = addr / raidPtr->Layout.sectorsPerStripeUnit;
SUID = SUID % info->stripeUnitsPerSparingRegion;
*outRow = 0;
*diskids = info->stripeIdentifier[ SUID ];
}
void rf_MapSIDToPSIDInterDecluster(
RF_RaidLayout_t *layoutPtr,
RF_StripeNum_t stripeID,
RF_StripeNum_t *psID,
RF_ReconUnitNum_t *which_ru)
{
*which_ru = 0;
*psID = stripeID;
}
/******************************************************************************
* select a graph to perform a single-stripe access
*
* Parameters: raidPtr - description of the physical array
* type - type of operation (read or write) requested
* asmap - logical & physical addresses for this access
* createFunc - name of function to use to create the graph
*****************************************************************************/
void rf_RAIDIDagSelect(
RF_Raid_t *raidPtr,
RF_IoType_t type,
RF_AccessStripeMap_t *asmap,
RF_VoidFuncPtr *createFunc)
{
RF_ASSERT(RF_IO_IS_R_OR_W(type));
if (asmap->numDataFailed + asmap->numParityFailed > 1) {
RF_ERRORMSG("Multiple disks failed in a single group! Aborting I/O operation.\n");
*createFunc = NULL;
return;
}
*createFunc = (type == RF_IO_TYPE_READ) ? (RF_VoidFuncPtr)rf_CreateFaultFreeReadDAG : (RF_VoidFuncPtr)rf_CreateRaidOneWriteDAG;
if (type == RF_IO_TYPE_READ) {
if (asmap->numDataFailed == 0)
*createFunc = (RF_VoidFuncPtr)rf_CreateMirrorPartitionReadDAG;
else
*createFunc = (RF_VoidFuncPtr)rf_CreateRaidOneDegradedReadDAG;
}
else
*createFunc = (RF_VoidFuncPtr)rf_CreateRaidOneWriteDAG;
}
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