Annotation of sys/dev/raidframe/rf_raid5_rotatedspare.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: rf_raid5_rotatedspare.c,v 1.4 2002/12/16 07:01:04 tdeval Exp $ */
! 2: /* $NetBSD: rf_raid5_rotatedspare.c,v 1.4 2000/01/07 03:41:03 oster Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1995 Carnegie-Mellon University.
! 6: * All rights reserved.
! 7: *
! 8: * Author: Khalil Amiri
! 9: *
! 10: * Permission to use, copy, modify and distribute this software and
! 11: * its documentation is hereby granted, provided that both the copyright
! 12: * notice and this permission notice appear in all copies of the
! 13: * software, derivative works or modified versions, and any portions
! 14: * thereof, and that both notices appear in supporting documentation.
! 15: *
! 16: * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
! 17: * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
! 18: * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
! 19: *
! 20: * Carnegie Mellon requests users of this software to return to
! 21: *
! 22: * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
! 23: * School of Computer Science
! 24: * Carnegie Mellon University
! 25: * Pittsburgh PA 15213-3890
! 26: *
! 27: * any improvements or extensions that they make and grant Carnegie the
! 28: * rights to redistribute these changes.
! 29: */
! 30:
! 31: /*****************************************************************************
! 32: *
! 33: * rf_raid5_rotated_spare.c -- Implements RAID Level 5 with rotated sparing.
! 34: *
! 35: *****************************************************************************/
! 36:
! 37: #include "rf_raid.h"
! 38: #include "rf_raid5.h"
! 39: #include "rf_dag.h"
! 40: #include "rf_dagutils.h"
! 41: #include "rf_dagfuncs.h"
! 42: #include "rf_general.h"
! 43: #include "rf_utils.h"
! 44: #include "rf_raid5_rotatedspare.h"
! 45:
! 46: typedef struct RF_Raid5RSConfigInfo_s {
! 47: RF_RowCol_t **stripeIdentifier; /*
! 48: * Filled in at config time & used by
! 49: * IdentifyStripe.
! 50: */
! 51: } RF_Raid5RSConfigInfo_t;
! 52:
! 53: int
! 54: rf_ConfigureRAID5_RS(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
! 55: RF_Config_t *cfgPtr)
! 56: {
! 57: RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
! 58: RF_Raid5RSConfigInfo_t *info;
! 59: RF_RowCol_t i, j, startdisk;
! 60:
! 61: /* Create a RAID level 5 configuration structure. */
! 62: RF_MallocAndAdd(info, sizeof(RF_Raid5RSConfigInfo_t),
! 63: (RF_Raid5RSConfigInfo_t *), raidPtr->cleanupList);
! 64: if (info == NULL)
! 65: return (ENOMEM);
! 66: layoutPtr->layoutSpecificInfo = (void *) info;
! 67:
! 68: RF_ASSERT(raidPtr->numRow == 1);
! 69: RF_ASSERT(raidPtr->numCol >= 3);
! 70:
! 71: /*
! 72: * The stripe identifier must identify the disks in each stripe, IN
! 73: * THE ORDER THAT THEY APPEAR IN THE STRIPE.
! 74: */
! 75: info->stripeIdentifier = rf_make_2d_array(raidPtr->numCol,
! 76: raidPtr->numCol, raidPtr->cleanupList);
! 77: if (info->stripeIdentifier == NULL)
! 78: return (ENOMEM);
! 79: startdisk = 0;
! 80: for (i = 0; i < raidPtr->numCol; i++) {
! 81: for (j = 0; j < raidPtr->numCol; j++) {
! 82: info->stripeIdentifier[i][j] = (startdisk + j) %
! 83: raidPtr->numCol;
! 84: }
! 85: if ((--startdisk) < 0)
! 86: startdisk = raidPtr->numCol - 1;
! 87: }
! 88:
! 89: /* Fill in the remaining layout parameters. */
! 90: layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
! 91: layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit <<
! 92: raidPtr->logBytesPerSector;
! 93: layoutPtr->numDataCol = raidPtr->numCol - 2;
! 94: layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol *
! 95: layoutPtr->sectorsPerStripeUnit;
! 96: layoutPtr->numParityCol = 1;
! 97: layoutPtr->dataStripeUnitsPerDisk = layoutPtr->stripeUnitsPerDisk;
! 98: raidPtr->sectorsPerDisk = layoutPtr->stripeUnitsPerDisk *
! 99: layoutPtr->sectorsPerStripeUnit;
! 100:
! 101: raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk *
! 102: layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
! 103:
! 104: return (0);
! 105: }
! 106:
! 107: RF_ReconUnitCount_t
! 108: rf_GetNumSpareRUsRAID5_RS(RF_Raid_t *raidPtr)
! 109: {
! 110: return (raidPtr->Layout.stripeUnitsPerDisk / raidPtr->numCol);
! 111: }
! 112:
! 113: void
! 114: rf_MapSectorRAID5_RS(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
! 115: RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
! 116: {
! 117: RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
! 118:
! 119: *row = 0;
! 120: if (remap) {
! 121: *col = raidPtr->numCol - 1 -
! 122: (1 + SUID / raidPtr->Layout.numDataCol) % raidPtr->numCol;
! 123: *col = (*col + 1) % raidPtr->numCol; /*
! 124: * Spare unit is rotated
! 125: * with parity; line
! 126: * above maps to parity.
! 127: */
! 128: } else {
! 129: *col = (SUID + (SUID / raidPtr->Layout.numDataCol)) %
! 130: raidPtr->numCol;
! 131: }
! 132: *diskSector = (SUID / (raidPtr->Layout.numDataCol)) *
! 133: raidPtr->Layout.sectorsPerStripeUnit +
! 134: (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
! 135: }
! 136:
! 137: void
! 138: rf_MapParityRAID5_RS(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
! 139: RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
! 140: {
! 141: RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
! 142:
! 143: *row = 0;
! 144: *col = raidPtr->numCol - 1 - (1 + SUID / raidPtr->Layout.numDataCol) %
! 145: raidPtr->numCol;
! 146: *diskSector = (SUID / (raidPtr->Layout.numDataCol)) *
! 147: raidPtr->Layout.sectorsPerStripeUnit +
! 148: (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
! 149: if (remap)
! 150: *col = (*col + 1) % raidPtr->numCol;
! 151: }
! 152:
! 153: void
! 154: rf_IdentifyStripeRAID5_RS(RF_Raid_t *raidPtr, RF_RaidAddr_t addr,
! 155: RF_RowCol_t **diskids, RF_RowCol_t *outRow)
! 156: {
! 157: RF_StripeNum_t stripeID =
! 158: rf_RaidAddressToStripeID(&raidPtr->Layout, addr);
! 159: RF_Raid5RSConfigInfo_t *info =
! 160: (RF_Raid5RSConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo;
! 161: *outRow = 0;
! 162: *diskids = info->stripeIdentifier[stripeID % raidPtr->numCol];
! 163:
! 164: }
! 165:
! 166: void
! 167: rf_MapSIDToPSIDRAID5_RS(RF_RaidLayout_t *layoutPtr, RF_StripeNum_t stripeID,
! 168: RF_StripeNum_t *psID, RF_ReconUnitNum_t *which_ru)
! 169: {
! 170: *which_ru = 0;
! 171: *psID = stripeID;
! 172: }
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