| 1 | /* $NetBSD: rf_evenodd_dags.c,v 1.4 2001/11/13 07:11:14 lukem Exp $ */ |
| 2 | /* |
| 3 | * rf_evenodd_dags.c |
| 4 | */ |
| 5 | /* |
| 6 | * Copyright (c) 1996 Carnegie-Mellon University. |
| 7 | * All rights reserved. |
| 8 | * |
| 9 | * Author: Chang-Ming Wu |
| 10 | * |
| 11 | * Permission to use, copy, modify and distribute this software and |
| 12 | * its documentation is hereby granted, provided that both the copyright |
| 13 | * notice and this permission notice appear in all copies of the |
| 14 | * software, derivative works or modified versions, and any portions |
| 15 | * thereof, and that both notices appear in supporting documentation. |
| 16 | * |
| 17 | * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" |
| 18 | * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND |
| 19 | * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. |
| 20 | * |
| 21 | * Carnegie Mellon requests users of this software to return to |
| 22 | * |
| 23 | * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU |
| 24 | * School of Computer Science |
| 25 | * Carnegie Mellon University |
| 26 | * Pittsburgh PA 15213-3890 |
| 27 | * |
| 28 | * any improvements or extensions that they make and grant Carnegie the |
| 29 | * rights to redistribute these changes. |
| 30 | */ |
| 31 | |
| 32 | #include <sys/cdefs.h> |
| 33 | __KERNEL_RCSID(0, "$NetBSD: rf_evenodd_dags.c,v 1.4 2001/11/13 07:11:14 lukem Exp $" ); |
| 34 | |
| 35 | #include "rf_archs.h" |
| 36 | |
| 37 | #if RF_INCLUDE_EVENODD > 0 |
| 38 | |
| 39 | #include <dev/raidframe/raidframevar.h> |
| 40 | |
| 41 | #include "rf_raid.h" |
| 42 | #include "rf_dag.h" |
| 43 | #include "rf_dagfuncs.h" |
| 44 | #include "rf_dagutils.h" |
| 45 | #include "rf_etimer.h" |
| 46 | #include "rf_acctrace.h" |
| 47 | #include "rf_general.h" |
| 48 | #include "rf_evenodd_dags.h" |
| 49 | #include "rf_evenodd.h" |
| 50 | #include "rf_evenodd_dagfuncs.h" |
| 51 | #include "rf_pq.h" |
| 52 | #include "rf_dagdegrd.h" |
| 53 | #include "rf_dagdegwr.h" |
| 54 | #include "rf_dagffwr.h" |
| 55 | |
| 56 | |
| 57 | /* |
| 58 | * Lost one data. |
| 59 | * Use P to reconstruct missing data. |
| 60 | */ |
| 61 | RF_CREATE_DAG_FUNC_DECL(rf_EO_100_CreateReadDAG) |
| 62 | { |
| 63 | rf_CreateDegradedReadDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_eoPRecoveryFuncs); |
| 64 | } |
| 65 | /* |
| 66 | * Lost data + E. |
| 67 | * Use P to reconstruct missing data. |
| 68 | */ |
| 69 | RF_CREATE_DAG_FUNC_DECL(rf_EO_101_CreateReadDAG) |
| 70 | { |
| 71 | rf_CreateDegradedReadDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_eoPRecoveryFuncs); |
| 72 | } |
| 73 | /* |
| 74 | * Lost data + P. |
| 75 | * Make E look like P, and use Eor for Xor, and we can |
| 76 | * use degraded read DAG. |
| 77 | */ |
| 78 | RF_CREATE_DAG_FUNC_DECL(rf_EO_110_CreateReadDAG) |
| 79 | { |
| 80 | RF_PhysDiskAddr_t *temp; |
| 81 | /* swap P and E pointers to fake out the DegradedReadDAG code */ |
| 82 | temp = asmap->parityInfo; |
| 83 | asmap->parityInfo = asmap->qInfo; |
| 84 | asmap->qInfo = temp; |
| 85 | rf_CreateDegradedReadDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_eoERecoveryFuncs); |
| 86 | } |
| 87 | /* |
| 88 | * Lost two data. |
| 89 | */ |
| 90 | RF_CREATE_DAG_FUNC_DECL(rf_EOCreateDoubleDegradedReadDAG) |
| 91 | { |
| 92 | rf_EO_DoubleDegRead(raidPtr, asmap, dag_h, bp, flags, allocList); |
| 93 | } |
| 94 | /* |
| 95 | * Lost two data. |
| 96 | */ |
| 97 | RF_CREATE_DAG_FUNC_DECL(rf_EO_200_CreateReadDAG) |
| 98 | { |
| 99 | rf_EOCreateDoubleDegradedReadDAG(raidPtr, asmap, dag_h, bp, flags, allocList); |
| 100 | } |
| 101 | RF_CREATE_DAG_FUNC_DECL(rf_EO_100_CreateWriteDAG) |
| 102 | { |
| 103 | if (asmap->numStripeUnitsAccessed != 1 && |
| 104 | asmap->failedPDAs[0]->numSector != raidPtr->Layout.sectorsPerStripeUnit) |
| 105 | RF_PANIC(); |
| 106 | rf_CommonCreateSimpleDegradedWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 2, (int (*) (RF_DagNode_t *)) rf_Degraded_100_EOFunc, RF_TRUE); |
| 107 | } |
| 108 | /* |
| 109 | * E is dead. Small write. |
| 110 | */ |
| 111 | RF_CREATE_DAG_FUNC_DECL(rf_EO_001_CreateSmallWriteDAG) |
| 112 | { |
| 113 | rf_CommonCreateSmallWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_EOSmallWritePFuncs, NULL); |
| 114 | } |
| 115 | /* |
| 116 | * E is dead. Large write. |
| 117 | */ |
| 118 | RF_CREATE_DAG_FUNC_DECL(rf_EO_001_CreateLargeWriteDAG) |
| 119 | { |
| 120 | rf_CommonCreateLargeWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 1, rf_RegularPFunc, RF_TRUE); |
| 121 | } |
| 122 | /* |
| 123 | * P is dead. Small write. |
| 124 | * Swap E + P, use single-degraded stuff. |
| 125 | */ |
| 126 | RF_CREATE_DAG_FUNC_DECL(rf_EO_010_CreateSmallWriteDAG) |
| 127 | { |
| 128 | RF_PhysDiskAddr_t *temp; |
| 129 | /* swap P and E pointers to fake out the DegradedReadDAG code */ |
| 130 | temp = asmap->parityInfo; |
| 131 | asmap->parityInfo = asmap->qInfo; |
| 132 | asmap->qInfo = temp; |
| 133 | rf_CommonCreateSmallWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_EOSmallWriteEFuncs, NULL); |
| 134 | } |
| 135 | /* |
| 136 | * P is dead. Large write. |
| 137 | * Swap E + P, use single-degraded stuff. |
| 138 | */ |
| 139 | RF_CREATE_DAG_FUNC_DECL(rf_EO_010_CreateLargeWriteDAG) |
| 140 | { |
| 141 | RF_PhysDiskAddr_t *temp; |
| 142 | /* swap P and E pointers to fake out the code */ |
| 143 | temp = asmap->parityInfo; |
| 144 | asmap->parityInfo = asmap->qInfo; |
| 145 | asmap->qInfo = temp; |
| 146 | rf_CommonCreateLargeWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 1, rf_RegularEFunc, RF_FALSE); |
| 147 | } |
| 148 | RF_CREATE_DAG_FUNC_DECL(rf_EO_011_CreateWriteDAG) |
| 149 | { |
| 150 | rf_CreateNonRedundantWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, |
| 151 | RF_IO_TYPE_WRITE); |
| 152 | } |
| 153 | RF_CREATE_DAG_FUNC_DECL(rf_EO_110_CreateWriteDAG) |
| 154 | { |
| 155 | RF_PhysDiskAddr_t *temp; |
| 156 | |
| 157 | if (asmap->numStripeUnitsAccessed != 1 && |
| 158 | asmap->failedPDAs[0]->numSector != raidPtr->Layout.sectorsPerStripeUnit) { |
| 159 | RF_PANIC(); |
| 160 | } |
| 161 | /* swap P and E to fake out parity code */ |
| 162 | temp = asmap->parityInfo; |
| 163 | asmap->parityInfo = asmap->qInfo; |
| 164 | asmap->qInfo = temp; |
| 165 | rf_CommonCreateSimpleDegradedWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 1, (int (*) (RF_DagNode_t *)) rf_EO_DegradedWriteEFunc, RF_FALSE); |
| 166 | /* is the regular E func the right one to call? */ |
| 167 | } |
| 168 | RF_CREATE_DAG_FUNC_DECL(rf_EO_101_CreateWriteDAG) |
| 169 | { |
| 170 | if (asmap->numStripeUnitsAccessed != 1 && |
| 171 | asmap->failedPDAs[0]->numSector != raidPtr->Layout.sectorsPerStripeUnit) |
| 172 | RF_PANIC(); |
| 173 | rf_CommonCreateSimpleDegradedWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 1, rf_RecoveryXorFunc, RF_TRUE); |
| 174 | } |
| 175 | RF_CREATE_DAG_FUNC_DECL(rf_EO_DoubleDegRead) |
| 176 | { |
| 177 | rf_DoubleDegRead(raidPtr, asmap, dag_h, bp, flags, allocList, |
| 178 | "Re" , "EvenOddRecovery" , rf_EvenOddDoubleRecoveryFunc); |
| 179 | } |
| 180 | RF_CREATE_DAG_FUNC_DECL(rf_EOCreateSmallWriteDAG) |
| 181 | { |
| 182 | rf_CommonCreateSmallWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, &rf_pFuncs, &rf_EOSmallWriteEFuncs); |
| 183 | } |
| 184 | RF_CREATE_DAG_FUNC_DECL(rf_EOCreateLargeWriteDAG) |
| 185 | { |
| 186 | rf_CommonCreateLargeWriteDAG(raidPtr, asmap, dag_h, bp, flags, allocList, 2, rf_RegularPEFunc, RF_FALSE); |
| 187 | } |
| 188 | RF_CREATE_DAG_FUNC_DECL(rf_EO_200_CreateWriteDAG) |
| 189 | { |
| 190 | rf_DoubleDegSmallWrite(raidPtr, asmap, dag_h, bp, flags, allocList, "Re" , "We" , "EOWrDDRecovery" , rf_EOWriteDoubleRecoveryFunc); |
| 191 | } |
| 192 | #endif /* RF_INCLUDE_EVENODD > 0 */ |
| 193 | |