Annotation of sys/dev/raidframe/rf_raid4.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: rf_raid4.c,v 1.4 2002/12/16 07:01:04 tdeval Exp $ */
! 2: /* $NetBSD: rf_raid4.c,v 1.4 2000/01/07 03:41:02 oster Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1995 Carnegie-Mellon University.
! 6: * All rights reserved.
! 7: *
! 8: * Author: Rachad Youssef
! 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_raid4.c -- Implements RAID Level 4.
! 34: *
! 35: *****************************************/
! 36:
! 37: #include "rf_raid.h"
! 38: #include "rf_dag.h"
! 39: #include "rf_dagutils.h"
! 40: #include "rf_dagfuncs.h"
! 41: #include "rf_dagffrd.h"
! 42: #include "rf_dagffwr.h"
! 43: #include "rf_dagdegrd.h"
! 44: #include "rf_dagdegwr.h"
! 45: #include "rf_raid4.h"
! 46: #include "rf_general.h"
! 47:
! 48: typedef struct RF_Raid4ConfigInfo_s {
! 49: RF_RowCol_t *stripeIdentifier; /*
! 50: * Filled in at config time & used by
! 51: * IdentifyStripe.
! 52: */
! 53: } RF_Raid4ConfigInfo_t;
! 54:
! 55:
! 56: int
! 57: rf_ConfigureRAID4(RF_ShutdownList_t **listp, RF_Raid_t *raidPtr,
! 58: RF_Config_t *cfgPtr)
! 59: {
! 60: RF_RaidLayout_t *layoutPtr = &raidPtr->Layout;
! 61: RF_Raid4ConfigInfo_t *info;
! 62: int i;
! 63:
! 64: /* Create a RAID level 4 configuration structure... */
! 65: RF_MallocAndAdd(info, sizeof(RF_Raid4ConfigInfo_t),
! 66: (RF_Raid4ConfigInfo_t *), raidPtr->cleanupList);
! 67: if (info == NULL)
! 68: return (ENOMEM);
! 69: layoutPtr->layoutSpecificInfo = (void *) info;
! 70:
! 71: /* ... and fill it in. */
! 72: RF_MallocAndAdd(info->stripeIdentifier, raidPtr->numCol *
! 73: sizeof(RF_RowCol_t), (RF_RowCol_t *), raidPtr->cleanupList);
! 74: if (info->stripeIdentifier == NULL)
! 75: return (ENOMEM);
! 76: for (i = 0; i < raidPtr->numCol; i++)
! 77: info->stripeIdentifier[i] = i;
! 78:
! 79: RF_ASSERT(raidPtr->numRow == 1);
! 80:
! 81: /* Fill in the remaining layout parameters. */
! 82: layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
! 83: layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit <<
! 84: raidPtr->logBytesPerSector;
! 85: layoutPtr->numDataCol = raidPtr->numCol - 1;
! 86: layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol *
! 87: layoutPtr->sectorsPerStripeUnit;
! 88: layoutPtr->numParityCol = 1;
! 89: raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk *
! 90: layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit;
! 91:
! 92: return (0);
! 93: }
! 94:
! 95: int
! 96: rf_GetDefaultNumFloatingReconBuffersRAID4(RF_Raid_t *raidPtr)
! 97: {
! 98: return (20);
! 99: }
! 100:
! 101: RF_HeadSepLimit_t
! 102: rf_GetDefaultHeadSepLimitRAID4(RF_Raid_t *raidPtr)
! 103: {
! 104: return (20);
! 105: }
! 106:
! 107: void
! 108: rf_MapSectorRAID4(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
! 109: RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
! 110: {
! 111: RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
! 112: *row = 0;
! 113: *col = SUID % raidPtr->Layout.numDataCol;
! 114: *diskSector = (SUID / (raidPtr->Layout.numDataCol)) *
! 115: raidPtr->Layout.sectorsPerStripeUnit +
! 116: (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
! 117: }
! 118:
! 119: void
! 120: rf_MapParityRAID4(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector,
! 121: RF_RowCol_t *row, RF_RowCol_t *col, RF_SectorNum_t *diskSector, int remap)
! 122: {
! 123: RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
! 124:
! 125: *row = 0;
! 126: *col = raidPtr->Layout.numDataCol;
! 127: *diskSector = (SUID / (raidPtr->Layout.numDataCol)) *
! 128: raidPtr->Layout.sectorsPerStripeUnit +
! 129: (raidSector % raidPtr->Layout.sectorsPerStripeUnit);
! 130: }
! 131:
! 132: void
! 133: rf_IdentifyStripeRAID4(RF_Raid_t *raidPtr, RF_RaidAddr_t addr,
! 134: RF_RowCol_t **diskids, RF_RowCol_t *outRow)
! 135: {
! 136: RF_Raid4ConfigInfo_t *info = raidPtr->Layout.layoutSpecificInfo;
! 137:
! 138: *outRow = 0;
! 139: *diskids = info->stripeIdentifier;
! 140: }
! 141:
! 142: void
! 143: rf_MapSIDToPSIDRAID4(RF_RaidLayout_t *layoutPtr, RF_StripeNum_t stripeID,
! 144: RF_StripeNum_t *psID, RF_ReconUnitNum_t *which_ru)
! 145: {
! 146: *which_ru = 0;
! 147: *psID = stripeID;
! 148: }
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