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rf_raid0.c revision 1.14 
      1 /*	$NetBSD: rf_raid0.c,v 1.14 2006/10/12 01:31:52 christos 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 <sys/cdefs.h>
     36 __KERNEL_RCSID(0, "$NetBSD: rf_raid0.c,v 1.14 2006/10/12 01:31:52 christos Exp $");
     37 
     38 #include <dev/raidframe/raidframevar.h>
     39 
     40 #include "rf_raid.h"
     41 #include "rf_raid0.h"
     42 #include "rf_dag.h"
     43 #include "rf_dagffrd.h"
     44 #include "rf_dagffwr.h"
     45 #include "rf_dagutils.h"
     46 #include "rf_dagfuncs.h"
     47 #include "rf_general.h"
     48 #include "rf_parityscan.h"
     49 
     50 typedef struct RF_Raid0ConfigInfo_s {
     51 	RF_RowCol_t *stripeIdentifier;
     52 }       RF_Raid0ConfigInfo_t;
     53 
     54 int
     55 rf_ConfigureRAID0(RF_ShutdownList_t **listp __unused, RF_Raid_t *raidPtr,
     56 		  RF_Config_t *cfgPtr __unused)
     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 	raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
     75 	layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
     76 	layoutPtr->dataSectorsPerStripe = raidPtr->numCol * layoutPtr->sectorsPerStripeUnit;
     77 	layoutPtr->numDataCol = raidPtr->numCol;
     78 	layoutPtr->numParityCol = 0;
     79 	return (0);
     80 }
     81 
     82 void
     83 rf_MapSectorRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
     84 	      RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap __unused)
     85 {
     86 	RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
     87 	*col = SUID % raidPtr->numCol;
     88 	*diskSector = (SUID / raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit +
     89 	    (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
     90 }
     91 
     92 void
     93 rf_MapParityRAID0(RF_Raid_t *raidPtr __unused,
     94     RF_RaidAddr_t raidSector __unused, RF_RowCol_t *col,
     95     RF_SectorNum_t *diskSector, int remap __unused)
     96 {
     97 	*col = 0;
     98 	*diskSector = 0;
     99 }
    100 
    101 void
    102 rf_IdentifyStripeRAID0(RF_Raid_t *raidPtr, RF_RaidAddr_t addr __unused,
    103 		       RF_RowCol_t **diskids)
    104 {
    105 	RF_Raid0ConfigInfo_t *info;
    106 
    107 	info = raidPtr->Layout.layoutSpecificInfo;
    108 	*diskids = info->stripeIdentifier;
    109 }
    110 
    111 void
    112 rf_MapSIDToPSIDRAID0(RF_RaidLayout_t *layoutPtr __unused,
    113     RF_StripeNum_t stripeID, RF_StripeNum_t *psID, RF_ReconUnitNum_t *which_ru)
    114 {
    115 	*which_ru = 0;
    116 	*psID = stripeID;
    117 }
    118 
    119 void
    120 rf_RAID0DagSelect(
    121     RF_Raid_t * raidPtr,
    122     RF_IoType_t type,
    123     RF_AccessStripeMap_t * asmap __unused,
    124     RF_VoidFuncPtr * createFunc)
    125 {
    126 	if (raidPtr->numFailures > 0) {
    127 		*createFunc = NULL;
    128 		return;
    129 	}
    130 	*createFunc = ((type == RF_IO_TYPE_READ) ?
    131 	    (RF_VoidFuncPtr) rf_CreateFaultFreeReadDAG : (RF_VoidFuncPtr) rf_CreateRAID0WriteDAG);
    132 }
    133 
    134 int
    135 rf_VerifyParityRAID0(RF_Raid_t *raidPtr __unused,
    136     RF_RaidAddr_t raidAddr __unused, RF_PhysDiskAddr_t *parityPDA __unused,
    137     int correct_it __unused, RF_RaidAccessFlags_t flags __unused)
    138 {
    139 	/*
    140          * No parity is always okay.
    141          */
    142 	return (RF_PARITY_OKAY);
    143 }
    144