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rf_raid0.c revision 1.3 
      1 /*	$NetBSD: rf_raid0.c,v 1.3 1999/02/05 00:06:15 oster Exp $	*/
      2 /*
      3  * Copyright (c) 1995 Carnegie-Mellon University.
      4  * All rights reserved.
      5  *
      6  * Author: Mark Holland
      7  *
      8  * Permission to use, copy, modify and distribute this software and
      9  * its documentation is hereby granted, provided that both the copyright
     10  * notice and this permission notice appear in all copies of the
     11  * software, derivative works or modified versions, and any portions
     12  * thereof, and that both notices appear in supporting documentation.
     13  *
     14  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     15  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
     16  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     17  *
     18  * Carnegie Mellon requests users of this software to return to
     19  *
     20  *  Software Distribution Coordinator  or  Software.Distribution (at) CS.CMU.EDU
     21  *  School of Computer Science
     22  *  Carnegie Mellon University
     23  *  Pittsburgh PA 15213-3890
     24  *
     25  * any improvements or extensions that they make and grant Carnegie the
     26  * rights to redistribute these changes.
     27  */
     28 
     29 /***************************************
     30  *
     31  * rf_raid0.c -- implements RAID Level 0
     32  *
     33  ***************************************/
     34 
     35 #include "rf_types.h"
     36 #include "rf_raid.h"
     37 #include "rf_raid0.h"
     38 #include "rf_dag.h"
     39 #include "rf_dagffrd.h"
     40 #include "rf_dagffwr.h"
     41 #include "rf_dagutils.h"
     42 #include "rf_dagfuncs.h"
     43 #include "rf_threadid.h"
     44 #include "rf_general.h"
     45 #include "rf_configure.h"
     46 #include "rf_parityscan.h"
     47 
     48 typedef struct RF_Raid0ConfigInfo_s {
     49 	RF_RowCol_t *stripeIdentifier;
     50 }       RF_Raid0ConfigInfo_t;
     51 
     52 int
     53 rf_ConfigureRAID0(
     54     RF_ShutdownList_t ** listp,
     55     RF_Raid_t * raidPtr,
     56     RF_Config_t * cfgPtr)
     57 {
     58 	RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
     59 	RF_Raid0ConfigInfo_t *info;
     60 	RF_RowCol_t i;
     61 
     62 	/* create a RAID level 0 configuration structure */
     63 	RF_MallocAndAdd(info, sizeof(RF_Raid0ConfigInfo_t), (RF_Raid0ConfigInfo_t *), raidPtr->cleanupList);
     64 	if (info == NULL)
     65 		return (ENOMEM);
     66 	layoutPtr->layoutSpecificInfo = (void *) info;
     67 
     68 	RF_MallocAndAdd(info->stripeIdentifier, raidPtr->numCol * sizeof(RF_RowCol_t), (RF_RowCol_t *), raidPtr->cleanupList);
     69 	if (info->stripeIdentifier == NULL)
     70 		return (ENOMEM);
     71 	for (i = 0; i < raidPtr->numCol; i++)
     72 		info->stripeIdentifier[i] = i;
     73 
     74 	RF_ASSERT(raidPtr->numRow == 1);
     75 	raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
     76 	layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
     77 	layoutPtr->dataSectorsPerStripe = raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
     78 	layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector;
     79 	layoutPtr->numDataCol = raidPtr->numCol;
     80 	layoutPtr->numParityCol = 0;
     81 	return (0);
     82 }
     83 
     84 void
     85 rf_MapSectorRAID0(
     86     RF_Raid_t * raidPtr,
     87     RF_RaidAddr_t raidSector,
     88     RF_RowCol_t * row,
     89     RF_RowCol_t * col,
     90     RF_SectorNum_t * diskSector,
     91     int remap)
     92 {
     93 	RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
     94 	*row = 0;
     95 	*col = SUID % raidPtr->numCol;
     96 	*diskSector = (SUID / raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit +
     97 	    (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
     98 }
     99 
    100 void
    101 rf_MapParityRAID0(
    102     RF_Raid_t * raidPtr,
    103     RF_RaidAddr_t raidSector,
    104     RF_RowCol_t * row,
    105     RF_RowCol_t * col,
    106     RF_SectorNum_t * diskSector,
    107     int remap)
    108 {
    109 	*row = *col = 0;
    110 	*diskSector = 0;
    111 }
    112 
    113 void
    114 rf_IdentifyStripeRAID0(
    115     RF_Raid_t * raidPtr,
    116     RF_RaidAddr_t addr,
    117     RF_RowCol_t ** diskids,
    118     RF_RowCol_t * outRow)
    119 {
    120 	RF_Raid0ConfigInfo_t *info;
    121 
    122 	info = raidPtr->Layout.layoutSpecificInfo;
    123 	*diskids = info->stripeIdentifier;
    124 	*outRow = 0;
    125 }
    126 
    127 void
    128 rf_MapSIDToPSIDRAID0(
    129     RF_RaidLayout_t * layoutPtr,
    130     RF_StripeNum_t stripeID,
    131     RF_StripeNum_t * psID,
    132     RF_ReconUnitNum_t * which_ru)
    133 {
    134 	*which_ru = 0;
    135 	*psID = stripeID;
    136 }
    137 
    138 void
    139 rf_RAID0DagSelect(
    140     RF_Raid_t * raidPtr,
    141     RF_IoType_t type,
    142     RF_AccessStripeMap_t * asmap,
    143     RF_VoidFuncPtr * createFunc)
    144 {
    145 	*createFunc = ((type == RF_IO_TYPE_READ) ?
    146 	    (RF_VoidFuncPtr) rf_CreateFaultFreeReadDAG : (RF_VoidFuncPtr) rf_CreateRAID0WriteDAG);
    147 }
    148 
    149 int
    150 rf_VerifyParityRAID0(
    151     RF_Raid_t * raidPtr,
    152     RF_RaidAddr_t raidAddr,
    153     RF_PhysDiskAddr_t * parityPDA,
    154     int correct_it,
    155     RF_RaidAccessFlags_t flags)
    156 {
    157 	/*
    158          * No parity is always okay.
    159          */
    160 	return (RF_PARITY_OKAY);
    161 }
    162