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rf_raid0.c revision 1.5 
      1 /*	$NetBSD: rf_raid0.c,v 1.5 2001/10/04 15:58:55 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 <dev/raidframe/raidframevar.h>
     36 
     37 #include "rf_raid.h"
     38 #include "rf_raid0.h"
     39 #include "rf_dag.h"
     40 #include "rf_dagffrd.h"
     41 #include "rf_dagffwr.h"
     42 #include "rf_dagutils.h"
     43 #include "rf_dagfuncs.h"
     44 #include "rf_general.h"
     45 #include "rf_parityscan.h"
     46 
     47 typedef struct RF_Raid0ConfigInfo_s {
     48 	RF_RowCol_t *stripeIdentifier;
     49 }       RF_Raid0ConfigInfo_t;
     50 
     51 int
     52 rf_ConfigureRAID0(
     53     RF_ShutdownList_t ** listp,
     54     RF_Raid_t * raidPtr,
     55     RF_Config_t * cfgPtr)
     56 {
     57 	RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
     58 	RF_Raid0ConfigInfo_t *info;
     59 	RF_RowCol_t i;
     60 
     61 	/* create a RAID level 0 configuration structure */
     62 	RF_MallocAndAdd(info, sizeof(RF_Raid0ConfigInfo_t), (RF_Raid0ConfigInfo_t *), raidPtr->cleanupList);
     63 	if (info == NULL)
     64 		return (ENOMEM);
     65 	layoutPtr->layoutSpecificInfo = (void *) info;
     66 
     67 	RF_MallocAndAdd(info->stripeIdentifier, raidPtr->numCol * sizeof(RF_RowCol_t), (RF_RowCol_t *), raidPtr->cleanupList);
     68 	if (info->stripeIdentifier == NULL)
     69 		return (ENOMEM);
     70 	for (i = 0; i < raidPtr->numCol; i++)
     71 		info->stripeIdentifier[i] = i;
     72 
     73 	RF_ASSERT(raidPtr->numRow == 1);
     74 	raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
     75 	layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
     76 	layoutPtr->dataSectorsPerStripe = raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
     77 	layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector;
     78 	layoutPtr->numDataCol = raidPtr->numCol;
     79 	layoutPtr->numParityCol = 0;
     80 	return (0);
     81 }
     82 
     83 void
     84 rf_MapSectorRAID0(
     85     RF_Raid_t * raidPtr,
     86     RF_RaidAddr_t raidSector,
     87     RF_RowCol_t * row,
     88     RF_RowCol_t * col,
     89     RF_SectorNum_t * diskSector,
     90     int remap)
     91 {
     92 	RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
     93 	*row = 0;
     94 	*col = SUID % raidPtr->numCol;
     95 	*diskSector = (SUID / raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit +
     96 	    (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
     97 }
     98 
     99 void
    100 rf_MapParityRAID0(
    101     RF_Raid_t * raidPtr,
    102     RF_RaidAddr_t raidSector,
    103     RF_RowCol_t * row,
    104     RF_RowCol_t * col,
    105     RF_SectorNum_t * diskSector,
    106     int remap)
    107 {
    108 	*row = *col = 0;
    109 	*diskSector = 0;
    110 }
    111 
    112 void
    113 rf_IdentifyStripeRAID0(
    114     RF_Raid_t * raidPtr,
    115     RF_RaidAddr_t addr,
    116     RF_RowCol_t ** diskids,
    117     RF_RowCol_t * outRow)
    118 {
    119 	RF_Raid0ConfigInfo_t *info;
    120 
    121 	info = raidPtr->Layout.layoutSpecificInfo;
    122 	*diskids = info->stripeIdentifier;
    123 	*outRow = 0;
    124 }
    125 
    126 void
    127 rf_MapSIDToPSIDRAID0(
    128     RF_RaidLayout_t * layoutPtr,
    129     RF_StripeNum_t stripeID,
    130     RF_StripeNum_t * psID,
    131     RF_ReconUnitNum_t * which_ru)
    132 {
    133 	*which_ru = 0;
    134 	*psID = stripeID;
    135 }
    136 
    137 void
    138 rf_RAID0DagSelect(
    139     RF_Raid_t * raidPtr,
    140     RF_IoType_t type,
    141     RF_AccessStripeMap_t * asmap,
    142     RF_VoidFuncPtr * createFunc)
    143 {
    144 	*createFunc = ((type == RF_IO_TYPE_READ) ?
    145 	    (RF_VoidFuncPtr) rf_CreateFaultFreeReadDAG : (RF_VoidFuncPtr) rf_CreateRAID0WriteDAG);
    146 }
    147 
    148 int
    149 rf_VerifyParityRAID0(
    150     RF_Raid_t * raidPtr,
    151     RF_RaidAddr_t raidAddr,
    152     RF_PhysDiskAddr_t * parityPDA,
    153     int correct_it,
    154     RF_RaidAccessFlags_t flags)
    155 {
    156 	/*
    157          * No parity is always okay.
    158          */
    159 	return (RF_PARITY_OKAY);
    160 }
    161