diff options
Diffstat (limited to 'sys/dev/raidframe/rf_raid4.c')
| -rw-r--r-- | sys/dev/raidframe/rf_raid4.c | 157 |
1 files changed, 157 insertions, 0 deletions
diff --git a/sys/dev/raidframe/rf_raid4.c b/sys/dev/raidframe/rf_raid4.c new file mode 100644 index 0000000..3f6c398 --- /dev/null +++ b/sys/dev/raidframe/rf_raid4.c @@ -0,0 +1,157 @@ +/* $FreeBSD$ */ +/* $NetBSD: rf_raid4.c,v 1.4 2000/01/07 03:41:02 oster Exp $ */ +/* + * Copyright (c) 1995 Carnegie-Mellon University. + * All rights reserved. + * + * Author: Rachad Youssef + * + * Permission to use, copy, modify and distribute this software and + * its documentation is hereby granted, provided that both the copyright + * notice and this permission notice appear in all copies of the + * software, derivative works or modified versions, and any portions + * thereof, and that both notices appear in supporting documentation. + * + * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" + * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND + * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. + * + * Carnegie Mellon requests users of this software to return to + * + * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU + * School of Computer Science + * Carnegie Mellon University + * Pittsburgh PA 15213-3890 + * + * any improvements or extensions that they make and grant Carnegie the + * rights to redistribute these changes. + */ + +/*************************************** + * + * rf_raid4.c -- implements RAID Level 4 + * + ***************************************/ + +#include <dev/raidframe/rf_raid.h> +#include <dev/raidframe/rf_dag.h> +#include <dev/raidframe/rf_dagutils.h> +#include <dev/raidframe/rf_dagfuncs.h> +#include <dev/raidframe/rf_dagffrd.h> +#include <dev/raidframe/rf_dagffwr.h> +#include <dev/raidframe/rf_dagdegrd.h> +#include <dev/raidframe/rf_dagdegwr.h> +#include <dev/raidframe/rf_raid4.h> +#include <dev/raidframe/rf_general.h> + +typedef struct RF_Raid4ConfigInfo_s { + RF_RowCol_t *stripeIdentifier; /* filled in at config time & used by + * IdentifyStripe */ +} RF_Raid4ConfigInfo_t; + + + +int +rf_ConfigureRAID4( + RF_ShutdownList_t ** listp, + RF_Raid_t * raidPtr, + RF_Config_t * cfgPtr) +{ + RF_RaidLayout_t *layoutPtr = &raidPtr->Layout; + RF_Raid4ConfigInfo_t *info; + int i; + + /* create a RAID level 4 configuration structure ... */ + RF_MallocAndAdd(info, sizeof(RF_Raid4ConfigInfo_t), (RF_Raid4ConfigInfo_t *), raidPtr->cleanupList); + if (info == NULL) + return (ENOMEM); + layoutPtr->layoutSpecificInfo = (void *) info; + + /* ... and fill it in. */ + RF_MallocAndAdd(info->stripeIdentifier, raidPtr->numCol * sizeof(RF_RowCol_t), (RF_RowCol_t *), raidPtr->cleanupList); + if (info->stripeIdentifier == NULL) + return (ENOMEM); + for (i = 0; i < raidPtr->numCol; i++) + info->stripeIdentifier[i] = i; + + RF_ASSERT(raidPtr->numRow == 1); + + /* fill in the remaining layout parameters */ + layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk; + layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector; + layoutPtr->numDataCol = raidPtr->numCol - 1; + layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit; + layoutPtr->numParityCol = 1; + raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit; + + return (0); +} + +int +rf_GetDefaultNumFloatingReconBuffersRAID4(RF_Raid_t * raidPtr) +{ + return (20); +} + +RF_HeadSepLimit_t +rf_GetDefaultHeadSepLimitRAID4(RF_Raid_t * raidPtr) +{ + return (20); +} + +void +rf_MapSectorRAID4( + RF_Raid_t * raidPtr, + RF_RaidAddr_t raidSector, + RF_RowCol_t * row, + RF_RowCol_t * col, + RF_SectorNum_t * diskSector, + int remap) +{ + RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit; + *row = 0; + *col = SUID % raidPtr->Layout.numDataCol; + *diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit + + (raidSector % raidPtr->Layout.sectorsPerStripeUnit); +} + +void +rf_MapParityRAID4( + RF_Raid_t * raidPtr, + RF_RaidAddr_t raidSector, + RF_RowCol_t * row, + RF_RowCol_t * col, + RF_SectorNum_t * diskSector, + int remap) +{ + RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit; + + *row = 0; + *col = raidPtr->Layout.numDataCol; + *diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit + + (raidSector % raidPtr->Layout.sectorsPerStripeUnit); +} + +void +rf_IdentifyStripeRAID4( + RF_Raid_t * raidPtr, + RF_RaidAddr_t addr, + RF_RowCol_t ** diskids, + RF_RowCol_t * outRow) +{ + RF_Raid4ConfigInfo_t *info = raidPtr->Layout.layoutSpecificInfo; + + *outRow = 0; + *diskids = info->stripeIdentifier; +} + +void +rf_MapSIDToPSIDRAID4( + RF_RaidLayout_t * layoutPtr, + RF_StripeNum_t stripeID, + RF_StripeNum_t * psID, + RF_ReconUnitNum_t * which_ru) +{ + *which_ru = 0; + *psID = stripeID; +} |
