1 /* $NetBSD: rf_raid0.c,v 1.7 2002/09/23 02:40:09 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@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 1.7 2002/09/23 02:40:09 oster 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( 56 RF_ShutdownList_t ** listp, 57 RF_Raid_t * raidPtr, 58 RF_Config_t * cfgPtr) 59 { 60 RF_RaidLayout_t *layoutPtr = &raidPtr->Layout; 61 RF_Raid0ConfigInfo_t *info; 62 RF_RowCol_t i; 63 64 /* create a RAID level 0 configuration structure */ 65 RF_MallocAndAdd(info, sizeof(RF_Raid0ConfigInfo_t), (RF_Raid0ConfigInfo_t *), raidPtr->cleanupList); 66 if (info == NULL) 67 return (ENOMEM); 68 layoutPtr->layoutSpecificInfo = (void *) info; 69 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 raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * raidPtr->numCol * layoutPtr->sectorsPerStripeUnit; 78 layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk; 79 layoutPtr->dataSectorsPerStripe = raidPtr->numCol * layoutPtr->sectorsPerStripeUnit; 80 layoutPtr->numDataCol = raidPtr->numCol; 81 layoutPtr->numParityCol = 0; 82 return (0); 83 } 84 85 void 86 rf_MapSectorRAID0( 87 RF_Raid_t * raidPtr, 88 RF_RaidAddr_t raidSector, 89 RF_RowCol_t * row, 90 RF_RowCol_t * col, 91 RF_SectorNum_t * diskSector, 92 int remap) 93 { 94 RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit; 95 *row = 0; 96 *col = SUID % raidPtr->numCol; 97 *diskSector = (SUID / raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit + 98 (raidSector % raidPtr->Layout.sectorsPerStripeUnit); 99 } 100 101 void 102 rf_MapParityRAID0( 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 *row = *col = 0; 111 *diskSector = 0; 112 } 113 114 void 115 rf_IdentifyStripeRAID0( 116 RF_Raid_t * raidPtr, 117 RF_RaidAddr_t addr, 118 RF_RowCol_t ** diskids, 119 RF_RowCol_t * outRow) 120 { 121 RF_Raid0ConfigInfo_t *info; 122 123 info = raidPtr->Layout.layoutSpecificInfo; 124 *diskids = info->stripeIdentifier; 125 *outRow = 0; 126 } 127 128 void 129 rf_MapSIDToPSIDRAID0( 130 RF_RaidLayout_t * layoutPtr, 131 RF_StripeNum_t stripeID, 132 RF_StripeNum_t * psID, 133 RF_ReconUnitNum_t * which_ru) 134 { 135 *which_ru = 0; 136 *psID = stripeID; 137 } 138 139 void 140 rf_RAID0DagSelect( 141 RF_Raid_t * raidPtr, 142 RF_IoType_t type, 143 RF_AccessStripeMap_t * asmap, 144 RF_VoidFuncPtr * createFunc) 145 { 146 *createFunc = ((type == RF_IO_TYPE_READ) ? 147 (RF_VoidFuncPtr) rf_CreateFaultFreeReadDAG : (RF_VoidFuncPtr) rf_CreateRAID0WriteDAG); 148 } 149 150 int 151 rf_VerifyParityRAID0( 152 RF_Raid_t * raidPtr, 153 RF_RaidAddr_t raidAddr, 154 RF_PhysDiskAddr_t * parityPDA, 155 int correct_it, 156 RF_RaidAccessFlags_t flags) 157 { 158 /* 159 * No parity is always okay. 160 */ 161 return (RF_PARITY_OKAY); 162 } 163