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rf_raid4.c revision 1.3.8.1 
      1 /*	$NetBSD: rf_raid4.c,v 1.3.8.1 2000/11/20 11:42:58 bouyer Exp $	*/
      2 /*
      3  * Copyright (c) 1995 Carnegie-Mellon University.
      4  * All rights reserved.
      5  *
      6  * Author: Rachad Youssef
      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_raid4.c -- implements RAID Level 4
     32  *
     33  ***************************************/
     34 
     35 #include "rf_raid.h"
     36 #include "rf_dag.h"
     37 #include "rf_dagutils.h"
     38 #include "rf_dagfuncs.h"
     39 #include "rf_dagffrd.h"
     40 #include "rf_dagffwr.h"
     41 #include "rf_dagdegrd.h"
     42 #include "rf_dagdegwr.h"
     43 #include "rf_raid4.h"
     44 #include "rf_general.h"
     45 
     46 typedef struct RF_Raid4ConfigInfo_s {
     47 	RF_RowCol_t *stripeIdentifier;	/* filled in at config time & used by
     48 					 * IdentifyStripe */
     49 }       RF_Raid4ConfigInfo_t;
     50 
     51 
     52 
     53 int
     54 rf_ConfigureRAID4(
     55     RF_ShutdownList_t ** listp,
     56     RF_Raid_t * raidPtr,
     57     RF_Config_t * cfgPtr)
     58 {
     59 	RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
     60 	RF_Raid4ConfigInfo_t *info;
     61 	int     i;
     62 
     63 	/* create a RAID level 4 configuration structure ... */
     64 	RF_MallocAndAdd(info, sizeof(RF_Raid4ConfigInfo_t), (RF_Raid4ConfigInfo_t *), raidPtr->cleanupList);
     65 	if (info == NULL)
     66 		return (ENOMEM);
     67 	layoutPtr->layoutSpecificInfo = (void *) info;
     68 
     69 	/* ... and fill it in. */
     70 	RF_MallocAndAdd(info->stripeIdentifier, raidPtr->numCol * sizeof(RF_RowCol_t), (RF_RowCol_t *), raidPtr->cleanupList);
     71 	if (info->stripeIdentifier == NULL)
     72 		return (ENOMEM);
     73 	for (i = 0; i < raidPtr->numCol; i++)
     74 		info->stripeIdentifier[i] = i;
     75 
     76 	RF_ASSERT(raidPtr->numRow == 1);
     77 
     78 	/* fill in the remaining layout parameters */
     79 	layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
     80 	layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector;
     81 	layoutPtr->numDataCol = raidPtr->numCol - 1;
     82 	layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
     83 	layoutPtr->numParityCol = 1;
     84 	raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
     85 
     86 	return (0);
     87 }
     88 
     89 int
     90 rf_GetDefaultNumFloatingReconBuffersRAID4(RF_Raid_t * raidPtr)
     91 {
     92 	return (20);
     93 }
     94 
     95 RF_HeadSepLimit_t
     96 rf_GetDefaultHeadSepLimitRAID4(RF_Raid_t * raidPtr)
     97 {
     98 	return (20);
     99 }
    100 
    101 void
    102 rf_MapSectorRAID4(
    103     RF_Raid_t * raidPtr,
    104     RF_RaidAddr_t raidSector,
    105     RF_RowCol_t * row,
    106     RF_RowCol_t * col,
    107     RF_SectorNum_t * diskSector,
    108     int remap)
    109 {
    110 	RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
    111 	*row = 0;
    112 	*col = SUID % raidPtr->Layout.numDataCol;
    113 	*diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit +
    114 	    (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
    115 }
    116 
    117 void
    118 rf_MapParityRAID4(
    119     RF_Raid_t * raidPtr,
    120     RF_RaidAddr_t raidSector,
    121     RF_RowCol_t * row,
    122     RF_RowCol_t * col,
    123     RF_SectorNum_t * diskSector,
    124     int remap)
    125 {
    126 	RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
    127 
    128 	*row = 0;
    129 	*col = raidPtr->Layout.numDataCol;
    130 	*diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit +
    131 	    (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
    132 }
    133 
    134 void
    135 rf_IdentifyStripeRAID4(
    136     RF_Raid_t * raidPtr,
    137     RF_RaidAddr_t addr,
    138     RF_RowCol_t ** diskids,
    139     RF_RowCol_t * outRow)
    140 {
    141 	RF_Raid4ConfigInfo_t *info = raidPtr->Layout.layoutSpecificInfo;
    142 
    143 	*outRow = 0;
    144 	*diskids = info->stripeIdentifier;
    145 }
    146 
    147 void
    148 rf_MapSIDToPSIDRAID4(
    149     RF_RaidLayout_t * layoutPtr,
    150     RF_StripeNum_t stripeID,
    151     RF_StripeNum_t * psID,
    152     RF_ReconUnitNum_t * which_ru)
    153 {
    154 	*which_ru = 0;
    155 	*psID = stripeID;
    156 }
    157