1 /* $NetBSD: rf_raid0.c,v 1.1 1998/11/13 04:20:33 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 /* 36 * : 37 * Log: rf_raid0.c,v 38 * Revision 1.24 1996/07/31 16:56:18 jimz 39 * dataBytesPerStripe, sectorsPerDisk init arch-indep. 40 * 41 * Revision 1.23 1996/07/27 23:36:08 jimz 42 * Solaris port of simulator 43 * 44 * Revision 1.22 1996/07/18 22:57:14 jimz 45 * port simulator to AIX 46 * 47 * Revision 1.21 1996/06/19 22:07:34 jimz 48 * added parity verify 49 * 50 * Revision 1.20 1996/06/17 14:38:33 jimz 51 * properly #if out RF_DEMO code 52 * fix bug in MakeConfig that was causing weird behavior 53 * in configuration routines (config was not zeroed at start) 54 * clean up genplot handling of stacks 55 * 56 * Revision 1.19 1996/06/10 11:55:47 jimz 57 * Straightened out some per-array/not-per-array distinctions, fixed 58 * a couple bugs related to confusion. Added shutdown lists. Removed 59 * layout shutdown function (now subsumed by shutdown lists). 60 * 61 * Revision 1.18 1996/06/07 22:26:27 jimz 62 * type-ify which_ru (RF_ReconUnitNum_t) 63 * 64 * Revision 1.17 1996/06/07 21:33:04 jimz 65 * begin using consistent types for sector numbers, 66 * stripe numbers, row+col numbers, recon unit numbers 67 * 68 * Revision 1.16 1996/06/03 23:28:26 jimz 69 * more bugfixes 70 * check in tree to sync for IPDS runs with current bugfixes 71 * there still may be a problem with threads in the script test 72 * getting I/Os stuck- not trivially reproducible (runs ~50 times 73 * in a row without getting stuck) 74 * 75 * Revision 1.15 1996/05/31 22:26:54 jimz 76 * fix a lot of mapping problems, memory allocation problems 77 * found some weird lock issues, fixed 'em 78 * more code cleanup 79 * 80 * Revision 1.14 1996/05/27 18:56:37 jimz 81 * more code cleanup 82 * better typing 83 * compiles in all 3 environments 84 * 85 * Revision 1.13 1996/05/24 22:17:04 jimz 86 * continue code + namespace cleanup 87 * typed a bunch of flags 88 * 89 * Revision 1.12 1996/05/24 01:59:45 jimz 90 * another checkpoint in code cleanup for release 91 * time to sync kernel tree 92 * 93 * Revision 1.11 1996/05/18 19:51:34 jimz 94 * major code cleanup- fix syntax, make some types consistent, 95 * add prototypes, clean out dead code, et cetera 96 * 97 * Revision 1.10 1996/05/03 19:37:32 wvcii 98 * moved dag creation routines to dag library 99 * 100 * Revision 1.9 1995/12/12 18:10:06 jimz 101 * MIN -> RF_MIN, MAX -> RF_MAX, ASSERT -> RF_ASSERT 102 * fix 80-column brain damage in comments 103 * 104 * Revision 1.8 1995/12/06 15:06:36 root 105 * added copyright info 106 * 107 * Revision 1.7 1995/11/17 18:57:15 wvcii 108 * added prototypint to MapParity 109 * 110 * Revision 1.6 1995/11/16 13:53:51 wvcii 111 * fixed bug in CreateRAID0WriteDAG prototype 112 * 113 * Revision 1.5 1995/11/07 15:22:01 wvcii 114 * changed RAID0DagSelect prototype 115 * function no longer generates numHdrSucc, numTermAnt 116 * 117 * Revision 1.4 1995/06/23 13:39:17 robby 118 * updeated to prototypes in rf_layout.h 119 * 120 */ 121 122 #include "rf_types.h" 123 #include "rf_raid.h" 124 #include "rf_raid0.h" 125 #include "rf_dag.h" 126 #include "rf_dagffrd.h" 127 #include "rf_dagffwr.h" 128 #include "rf_dagutils.h" 129 #include "rf_dagfuncs.h" 130 #include "rf_threadid.h" 131 #include "rf_general.h" 132 #include "rf_configure.h" 133 #include "rf_parityscan.h" 134 135 typedef struct RF_Raid0ConfigInfo_s { 136 RF_RowCol_t *stripeIdentifier; 137 } RF_Raid0ConfigInfo_t; 138 139 int rf_ConfigureRAID0( 140 RF_ShutdownList_t **listp, 141 RF_Raid_t *raidPtr, 142 RF_Config_t *cfgPtr) 143 { 144 RF_RaidLayout_t *layoutPtr = &raidPtr->Layout; 145 RF_Raid0ConfigInfo_t *info; 146 RF_RowCol_t i; 147 148 /* create a RAID level 0 configuration structure */ 149 RF_MallocAndAdd(info, sizeof(RF_Raid0ConfigInfo_t), (RF_Raid0ConfigInfo_t *), raidPtr->cleanupList); 150 if (info == NULL) 151 return(ENOMEM); 152 layoutPtr->layoutSpecificInfo = (void *)info; 153 154 RF_MallocAndAdd(info->stripeIdentifier, raidPtr->numCol * sizeof(RF_RowCol_t), (RF_RowCol_t *), raidPtr->cleanupList); 155 if (info->stripeIdentifier == NULL) 156 return(ENOMEM); 157 for (i=0; i<raidPtr->numCol; i++) 158 info->stripeIdentifier[i] = i; 159 160 RF_ASSERT(raidPtr->numRow == 1); 161 raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * raidPtr->numCol * layoutPtr->sectorsPerStripeUnit; 162 layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk; 163 layoutPtr->dataSectorsPerStripe = raidPtr->numCol * layoutPtr->sectorsPerStripeUnit; 164 layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector; 165 layoutPtr->numDataCol = raidPtr->numCol; 166 layoutPtr->numParityCol = 0; 167 return(0); 168 } 169 170 void rf_MapSectorRAID0( 171 RF_Raid_t *raidPtr, 172 RF_RaidAddr_t raidSector, 173 RF_RowCol_t *row, 174 RF_RowCol_t *col, 175 RF_SectorNum_t *diskSector, 176 int remap) 177 { 178 RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit; 179 *row = 0; 180 *col = SUID % raidPtr->numCol; 181 *diskSector = (SUID / raidPtr->numCol) * raidPtr->Layout.sectorsPerStripeUnit + 182 (raidSector % raidPtr->Layout.sectorsPerStripeUnit); 183 } 184 185 void rf_MapParityRAID0( 186 RF_Raid_t *raidPtr, 187 RF_RaidAddr_t raidSector, 188 RF_RowCol_t *row, 189 RF_RowCol_t *col, 190 RF_SectorNum_t *diskSector, 191 int remap) 192 { 193 *row = *col = 0; 194 *diskSector = 0; 195 } 196 197 void rf_IdentifyStripeRAID0( 198 RF_Raid_t *raidPtr, 199 RF_RaidAddr_t addr, 200 RF_RowCol_t **diskids, 201 RF_RowCol_t *outRow) 202 { 203 RF_Raid0ConfigInfo_t *info; 204 205 info = raidPtr->Layout.layoutSpecificInfo; 206 *diskids = info->stripeIdentifier; 207 *outRow = 0; 208 } 209 210 void rf_MapSIDToPSIDRAID0( 211 RF_RaidLayout_t *layoutPtr, 212 RF_StripeNum_t stripeID, 213 RF_StripeNum_t *psID, 214 RF_ReconUnitNum_t *which_ru) 215 { 216 *which_ru = 0; 217 *psID = stripeID; 218 } 219 220 void rf_RAID0DagSelect( 221 RF_Raid_t *raidPtr, 222 RF_IoType_t type, 223 RF_AccessStripeMap_t *asmap, 224 RF_VoidFuncPtr *createFunc) 225 { 226 *createFunc = ((type == RF_IO_TYPE_READ) ? 227 (RF_VoidFuncPtr)rf_CreateFaultFreeReadDAG : (RF_VoidFuncPtr)rf_CreateRAID0WriteDAG); 228 } 229 230 int rf_VerifyParityRAID0( 231 RF_Raid_t *raidPtr, 232 RF_RaidAddr_t raidAddr, 233 RF_PhysDiskAddr_t *parityPDA, 234 int correct_it, 235 RF_RaidAccessFlags_t flags) 236 { 237 /* 238 * No parity is always okay. 239 */ 240 return(RF_PARITY_OKAY); 241 } 242