| 1 | /* $NetBSD: rf_raid4.c,v 1.12 2006/11/16 01:33:23 christos Exp $ */ |
| 2 | /* |
| 3 | * Copyright (c) 1995 Carnegie-Mellon University. |
| 4 | * All rights reserved. |
| 5 | * |
| 6 | * Author: Rachad Youssef |
| 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_raid4.c -- implements RAID Level 4 |
| 32 | * |
| 33 | ***************************************/ |
| 34 | |
| 35 | #include <sys/cdefs.h> |
| 36 | __KERNEL_RCSID(0, "$NetBSD: rf_raid4.c,v 1.12 2006/11/16 01:33:23 christos Exp $" ); |
| 37 | |
| 38 | #include "rf_raid.h" |
| 39 | #include "rf_dag.h" |
| 40 | #include "rf_dagutils.h" |
| 41 | #include "rf_dagfuncs.h" |
| 42 | #include "rf_dagffrd.h" |
| 43 | #include "rf_dagffwr.h" |
| 44 | #include "rf_dagdegrd.h" |
| 45 | #include "rf_dagdegwr.h" |
| 46 | #include "rf_raid4.h" |
| 47 | #include "rf_general.h" |
| 48 | |
| 49 | typedef struct RF_Raid4ConfigInfo_s { |
| 50 | RF_RowCol_t *stripeIdentifier; /* filled in at config time & used by |
| 51 | * IdentifyStripe */ |
| 52 | } RF_Raid4ConfigInfo_t; |
| 53 | |
| 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), (RF_Raid4ConfigInfo_t *), raidPtr->cleanupList); |
| 66 | if (info == NULL) |
| 67 | return (ENOMEM); |
| 68 | layoutPtr->layoutSpecificInfo = (void *) info; |
| 69 | |
| 70 | /* ... and fill it in. */ |
| 71 | RF_MallocAndAdd(info->stripeIdentifier, raidPtr->numCol * sizeof(RF_RowCol_t), (RF_RowCol_t *), raidPtr->cleanupList); |
| 72 | if (info->stripeIdentifier == NULL) |
| 73 | return (ENOMEM); |
| 74 | for (i = 0; i < raidPtr->numCol; i++) |
| 75 | info->stripeIdentifier[i] = i; |
| 76 | |
| 77 | /* fill in the remaining layout parameters */ |
| 78 | layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk; |
| 79 | layoutPtr->numDataCol = raidPtr->numCol - 1; |
| 80 | layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit; |
| 81 | layoutPtr->numParityCol = 1; |
| 82 | raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit; |
| 83 | |
| 84 | return (0); |
| 85 | } |
| 86 | |
| 87 | int |
| 88 | rf_GetDefaultNumFloatingReconBuffersRAID4(RF_Raid_t *raidPtr) |
| 89 | { |
| 90 | return (20); |
| 91 | } |
| 92 | |
| 93 | RF_HeadSepLimit_t |
| 94 | rf_GetDefaultHeadSepLimitRAID4(RF_Raid_t *raidPtr) |
| 95 | { |
| 96 | return (20); |
| 97 | } |
| 98 | |
| 99 | void |
| 100 | rf_MapSectorRAID4(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector, |
| 101 | RF_RowCol_t *col, RF_SectorNum_t *diskSector, |
| 102 | int remap) |
| 103 | { |
| 104 | RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit; |
| 105 | *col = SUID % raidPtr->Layout.numDataCol; |
| 106 | *diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit + |
| 107 | (raidSector % raidPtr->Layout.sectorsPerStripeUnit); |
| 108 | } |
| 109 | |
| 110 | void |
| 111 | rf_MapParityRAID4(RF_Raid_t *raidPtr, RF_RaidAddr_t raidSector, |
| 112 | RF_RowCol_t *col, RF_SectorNum_t *diskSector, |
| 113 | int remap) |
| 114 | { |
| 115 | RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit; |
| 116 | |
| 117 | *col = raidPtr->Layout.numDataCol; |
| 118 | *diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit + |
| 119 | (raidSector % raidPtr->Layout.sectorsPerStripeUnit); |
| 120 | } |
| 121 | |
| 122 | void |
| 123 | rf_IdentifyStripeRAID4(RF_Raid_t *raidPtr, RF_RaidAddr_t addr, |
| 124 | RF_RowCol_t **diskids) |
| 125 | { |
| 126 | RF_Raid4ConfigInfo_t *info = raidPtr->Layout.layoutSpecificInfo; |
| 127 | |
| 128 | *diskids = info->stripeIdentifier; |
| 129 | } |
| 130 | |
| 131 | void |
| 132 | rf_MapSIDToPSIDRAID4(RF_RaidLayout_t *layoutPtr, |
| 133 | RF_StripeNum_t stripeID, |
| 134 | RF_StripeNum_t *psID, RF_ReconUnitNum_t *which_ru) |
| 135 | { |
| 136 | *which_ru = 0; |
| 137 | *psID = stripeID; |
| 138 | } |
| 139 | |