Annotation of sys/dev/raidframe/rf_evenodd_dags.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: rf_evenodd_dags.c,v 1.3 2002/12/16 07:01:04 tdeval Exp $ */
! 2: /* $NetBSD: rf_evenodd_dags.c,v 1.2 1999/02/05 00:06:11 oster Exp $ */
! 3:
! 4: /*
! 5: * rf_evenodd_dags.c
! 6: */
! 7: /*
! 8: * Copyright (c) 1996 Carnegie-Mellon University.
! 9: * All rights reserved.
! 10: *
! 11: * Author: Chang-Ming Wu
! 12: *
! 13: * Permission to use, copy, modify and distribute this software and
! 14: * its documentation is hereby granted, provided that both the copyright
! 15: * notice and this permission notice appear in all copies of the
! 16: * software, derivative works or modified versions, and any portions
! 17: * thereof, and that both notices appear in supporting documentation.
! 18: *
! 19: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
! 20: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
! 21: * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
! 22: *
! 23: * Carnegie Mellon requests users of this software to return to
! 24: *
! 25: * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
! 26: * School of Computer Science
! 27: * Carnegie Mellon University
! 28: * Pittsburgh PA 15213-3890
! 29: *
! 30: * any improvements or extensions that they make and grant Carnegie the
! 31: * rights to redistribute these changes.
! 32: */
! 33:
! 34: #include "rf_archs.h"
! 35:
! 36: #if RF_INCLUDE_EVENODD > 0
! 37:
! 38: #include "rf_types.h"
! 39: #include "rf_raid.h"
! 40: #include "rf_dag.h"
! 41: #include "rf_dagfuncs.h"
! 42: #include "rf_dagutils.h"
! 43: #include "rf_etimer.h"
! 44: #include "rf_acctrace.h"
! 45: #include "rf_general.h"
! 46: #include "rf_evenodd_dags.h"
! 47: #include "rf_evenodd.h"
! 48: #include "rf_evenodd_dagfuncs.h"
! 49: #include "rf_pq.h"
! 50: #include "rf_dagdegrd.h"
! 51: #include "rf_dagdegwr.h"
! 52: #include "rf_dagffwr.h"
! 53:
! 54:
! 55: /*
! 56: * Lost one data.
! 57: * Use P to reconstruct missing data.
! 58: */
! 59: RF_CREATE_DAG_FUNC_DECL(rf_EO_100_CreateReadDAG)
! 60: {
! 61: rf_CreateDegradedReadDAG(raidPtr, asmap, dag_h, bp, flags, allocList,
! 62: &rf_eoPRecoveryFuncs);
! 63: }
! 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,
! 72: &rf_eoPRecoveryFuncs);
! 73: }
! 74:
! 75: /*
! 76: * Lost data + P.
! 77: * Make E look like P, and use Eor for Xor, and we can
! 78: * use degraded read DAG.
! 79: */
! 80: RF_CREATE_DAG_FUNC_DECL(rf_EO_110_CreateReadDAG)
! 81: {
! 82: RF_PhysDiskAddr_t *temp;
! 83: /* Swap P and E pointers to fake out the DegradedReadDAG code. */
! 84: temp = asmap->parityInfo;
! 85: asmap->parityInfo = asmap->qInfo;
! 86: asmap->qInfo = temp;
! 87: rf_CreateDegradedReadDAG(raidPtr, asmap, dag_h, bp, flags, allocList,
! 88: &rf_eoERecoveryFuncs);
! 89: }
! 90:
! 91: /*
! 92: * Lost two data.
! 93: */
! 94: RF_CREATE_DAG_FUNC_DECL(rf_EOCreateDoubleDegradedReadDAG)
! 95: {
! 96: rf_EO_DoubleDegRead(raidPtr, asmap, dag_h, bp, flags, allocList);
! 97: }
! 98:
! 99: /*
! 100: * Lost two data.
! 101: */
! 102: RF_CREATE_DAG_FUNC_DECL(rf_EO_200_CreateReadDAG)
! 103: {
! 104: rf_EOCreateDoubleDegradedReadDAG(raidPtr, asmap, dag_h, bp, flags,
! 105: allocList);
! 106: }
! 107:
! 108: RF_CREATE_DAG_FUNC_DECL(rf_EO_100_CreateWriteDAG)
! 109: {
! 110: if (asmap->numStripeUnitsAccessed != 1 &&
! 111: asmap->failedPDAs[0]->numSector !=
! 112: raidPtr->Layout.sectorsPerStripeUnit)
! 113: RF_PANIC();
! 114: rf_CommonCreateSimpleDegradedWriteDAG(raidPtr, asmap, dag_h, bp,
! 115: flags, allocList, 2,
! 116: (int (*) (RF_DagNode_t *)) rf_Degraded_100_EOFunc, RF_TRUE);
! 117: }
! 118:
! 119: /*
! 120: * E is dead. Small write.
! 121: */
! 122: RF_CREATE_DAG_FUNC_DECL(rf_EO_001_CreateSmallWriteDAG)
! 123: {
! 124: rf_CommonCreateSmallWriteDAG(raidPtr, asmap, dag_h, bp, flags,
! 125: allocList, &rf_EOSmallWritePFuncs, NULL);
! 126: }
! 127:
! 128: /*
! 129: * E is dead. Large write.
! 130: */
! 131: RF_CREATE_DAG_FUNC_DECL(rf_EO_001_CreateLargeWriteDAG)
! 132: {
! 133: rf_CommonCreateLargeWriteDAG(raidPtr, asmap, dag_h, bp, flags,
! 134: allocList, 1, rf_RegularPFunc, RF_TRUE);
! 135: }
! 136:
! 137: /*
! 138: * P is dead. Small write.
! 139: * Swap E + P, use single-degraded stuff.
! 140: */
! 141: RF_CREATE_DAG_FUNC_DECL(rf_EO_010_CreateSmallWriteDAG)
! 142: {
! 143: RF_PhysDiskAddr_t *temp;
! 144: /* Swap P and E pointers to fake out the DegradedReadDAG code. */
! 145: temp = asmap->parityInfo;
! 146: asmap->parityInfo = asmap->qInfo;
! 147: asmap->qInfo = temp;
! 148: rf_CommonCreateSmallWriteDAG(raidPtr, asmap, dag_h, bp, flags,
! 149: allocList, &rf_EOSmallWriteEFuncs, NULL);
! 150: }
! 151:
! 152: /*
! 153: * P is dead. Large write.
! 154: * Swap E + P, use single-degraded stuff.
! 155: */
! 156: RF_CREATE_DAG_FUNC_DECL(rf_EO_010_CreateLargeWriteDAG)
! 157: {
! 158: RF_PhysDiskAddr_t *temp;
! 159: /* Swap P and E pointers to fake out the code. */
! 160: temp = asmap->parityInfo;
! 161: asmap->parityInfo = asmap->qInfo;
! 162: asmap->qInfo = temp;
! 163: rf_CommonCreateLargeWriteDAG(raidPtr, asmap, dag_h, bp, flags,
! 164: allocList, 1, rf_RegularEFunc, RF_FALSE);
! 165: }
! 166:
! 167: RF_CREATE_DAG_FUNC_DECL(rf_EO_011_CreateWriteDAG)
! 168: {
! 169: rf_CreateNonRedundantWriteDAG(raidPtr, asmap, dag_h, bp, flags,
! 170: allocList, RF_IO_TYPE_WRITE);
! 171: }
! 172:
! 173: RF_CREATE_DAG_FUNC_DECL(rf_EO_110_CreateWriteDAG)
! 174: {
! 175: RF_PhysDiskAddr_t *temp;
! 176:
! 177: if (asmap->numStripeUnitsAccessed != 1 &&
! 178: asmap->failedPDAs[0]->numSector !=
! 179: raidPtr->Layout.sectorsPerStripeUnit) {
! 180: RF_PANIC();
! 181: }
! 182: /* Swap P and E to fake out parity code. */
! 183: temp = asmap->parityInfo;
! 184: asmap->parityInfo = asmap->qInfo;
! 185: asmap->qInfo = temp;
! 186: rf_CommonCreateSimpleDegradedWriteDAG(raidPtr, asmap, dag_h, bp,
! 187: flags, allocList, 1,
! 188: (int (*) (RF_DagNode_t *)) rf_EO_DegradedWriteEFunc, RF_FALSE);
! 189: /* Is the regular E func the right one to call ? */
! 190: }
! 191:
! 192: RF_CREATE_DAG_FUNC_DECL(rf_EO_101_CreateWriteDAG)
! 193: {
! 194: if (asmap->numStripeUnitsAccessed != 1 &&
! 195: asmap->failedPDAs[0]->numSector !=
! 196: raidPtr->Layout.sectorsPerStripeUnit)
! 197: RF_PANIC();
! 198: rf_CommonCreateSimpleDegradedWriteDAG(raidPtr, asmap, dag_h, bp,
! 199: flags, allocList, 1, rf_RecoveryXorFunc, RF_TRUE);
! 200: }
! 201:
! 202: RF_CREATE_DAG_FUNC_DECL(rf_EO_DoubleDegRead)
! 203: {
! 204: rf_DoubleDegRead(raidPtr, asmap, dag_h, bp, flags, allocList,
! 205: "Re", "EvenOddRecovery", rf_EvenOddDoubleRecoveryFunc);
! 206: }
! 207:
! 208: RF_CREATE_DAG_FUNC_DECL(rf_EOCreateSmallWriteDAG)
! 209: {
! 210: rf_CommonCreateSmallWriteDAG(raidPtr, asmap, dag_h, bp, flags,
! 211: allocList, &rf_pFuncs, &rf_EOSmallWriteEFuncs);
! 212: }
! 213:
! 214: RF_CREATE_DAG_FUNC_DECL(rf_EOCreateLargeWriteDAG)
! 215: {
! 216: rf_CommonCreateLargeWriteDAG(raidPtr, asmap, dag_h, bp, flags,
! 217: allocList, 2, rf_RegularPEFunc, RF_FALSE);
! 218: }
! 219:
! 220: RF_CREATE_DAG_FUNC_DECL(rf_EO_200_CreateWriteDAG)
! 221: {
! 222: rf_DoubleDegSmallWrite(raidPtr, asmap, dag_h, bp, flags, allocList,
! 223: "Re", "We", "EOWrDDRecovery", rf_EOWriteDoubleRecoveryFunc);
! 224: }
! 225:
! 226: #endif /* RF_INCLUDE_EVENODD > 0 */
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