diff options
Diffstat (limited to 'sys/dev/raidframe/rf_raid5_rotatedspare.c')
| -rw-r--r-- | sys/dev/raidframe/rf_raid5_rotatedspare.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/sys/dev/raidframe/rf_raid5_rotatedspare.c b/sys/dev/raidframe/rf_raid5_rotatedspare.c new file mode 100644 index 0000000..5c17b43 --- /dev/null +++ b/sys/dev/raidframe/rf_raid5_rotatedspare.c @@ -0,0 +1,175 @@ +/* $FreeBSD$ */ +/* $NetBSD: rf_raid5_rotatedspare.c,v 1.5 2001/01/26 05:16:58 oster Exp $ */ +/* + * Copyright (c) 1995 Carnegie-Mellon University. + * All rights reserved. + * + * Author: Khalil Amiri + * + * 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_raid5_rotated_spare.c -- implements RAID Level 5 with rotated sparing + * + **************************************************************************/ + +#include <dev/raidframe/rf_archs.h> + +#if RF_INCLUDE_RAID5_RS > 0 + +#include <dev/raidframe/rf_raid.h> +#include <dev/raidframe/rf_raid5.h> +#include <dev/raidframe/rf_dag.h> +#include <dev/raidframe/rf_dagutils.h> +#include <dev/raidframe/rf_dagfuncs.h> +#include <dev/raidframe/rf_general.h> +#include <dev/raidframe/rf_utils.h> +#include <dev/raidframe/rf_raid5_rotatedspare.h> + +typedef struct RF_Raid5RSConfigInfo_s { + RF_RowCol_t **stripeIdentifier; /* filled in at config time & used by + * IdentifyStripe */ +} RF_Raid5RSConfigInfo_t; + +int +rf_ConfigureRAID5_RS( + RF_ShutdownList_t ** listp, + RF_Raid_t * raidPtr, + RF_Config_t * cfgPtr) +{ + RF_RaidLayout_t *layoutPtr = &raidPtr->Layout; + RF_Raid5RSConfigInfo_t *info; + RF_RowCol_t i, j, startdisk; + + /* create a RAID level 5 configuration structure */ + RF_MallocAndAdd(info, sizeof(RF_Raid5RSConfigInfo_t), (RF_Raid5RSConfigInfo_t *), raidPtr->cleanupList); + if (info == NULL) + return (ENOMEM); + layoutPtr->layoutSpecificInfo = (void *) info; + + RF_ASSERT(raidPtr->numRow == 1); + RF_ASSERT(raidPtr->numCol >= 3); + + /* the stripe identifier must identify the disks in each stripe, IN + * THE ORDER THAT THEY APPEAR IN THE STRIPE. */ + info->stripeIdentifier = rf_make_2d_array(raidPtr->numCol, raidPtr->numCol, raidPtr->cleanupList); + if (info->stripeIdentifier == NULL) + return (ENOMEM); + startdisk = 0; + for (i = 0; i < raidPtr->numCol; i++) { + for (j = 0; j < raidPtr->numCol; j++) { + info->stripeIdentifier[i][j] = (startdisk + j) % raidPtr->numCol; + } + if ((--startdisk) < 0) + startdisk = raidPtr->numCol - 1; + } + + /* fill in the remaining layout parameters */ + layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk; + layoutPtr->bytesPerStripeUnit = layoutPtr->sectorsPerStripeUnit << raidPtr->logBytesPerSector; + layoutPtr->numDataCol = raidPtr->numCol - 2; + layoutPtr->dataSectorsPerStripe = layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit; + layoutPtr->numParityCol = 1; + layoutPtr->dataStripeUnitsPerDisk = layoutPtr->stripeUnitsPerDisk; + raidPtr->sectorsPerDisk = layoutPtr->stripeUnitsPerDisk * layoutPtr->sectorsPerStripeUnit; + + raidPtr->totalSectors = layoutPtr->stripeUnitsPerDisk * layoutPtr->numDataCol * layoutPtr->sectorsPerStripeUnit; + + return (0); +} + +RF_ReconUnitCount_t +rf_GetNumSpareRUsRAID5_RS(raidPtr) + RF_Raid_t *raidPtr; +{ + return (raidPtr->Layout.stripeUnitsPerDisk / raidPtr->numCol); +} + +void +rf_MapSectorRAID5_RS( + 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; + if (remap) { + *col = raidPtr->numCol - 1 - (1 + SUID / raidPtr->Layout.numDataCol) % raidPtr->numCol; + *col = (*col + 1) % raidPtr->numCol; /* spare unit is rotated + * with parity; line + * above maps to parity */ + } else { + *col = (SUID + (SUID / raidPtr->Layout.numDataCol)) % raidPtr->numCol; + } + *diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit + + (raidSector % raidPtr->Layout.sectorsPerStripeUnit); +} + +void +rf_MapParityRAID5_RS( + 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->numCol - 1 - (1 + SUID / raidPtr->Layout.numDataCol) % raidPtr->numCol; + *diskSector = (SUID / (raidPtr->Layout.numDataCol)) * raidPtr->Layout.sectorsPerStripeUnit + + (raidSector % raidPtr->Layout.sectorsPerStripeUnit); + if (remap) + *col = (*col + 1) % raidPtr->numCol; +} + +void +rf_IdentifyStripeRAID5_RS( + RF_Raid_t * raidPtr, + RF_RaidAddr_t addr, + RF_RowCol_t ** diskids, + RF_RowCol_t * outRow) +{ + RF_StripeNum_t stripeID = rf_RaidAddressToStripeID(&raidPtr->Layout, addr); + RF_Raid5RSConfigInfo_t *info = (RF_Raid5RSConfigInfo_t *) raidPtr->Layout.layoutSpecificInfo; + *outRow = 0; + *diskids = info->stripeIdentifier[stripeID % raidPtr->numCol]; + +} + +void +rf_MapSIDToPSIDRAID5_RS( + RF_RaidLayout_t * layoutPtr, + RF_StripeNum_t stripeID, + RF_StripeNum_t * psID, + RF_ReconUnitNum_t * which_ru) +{ + *which_ru = 0; + *psID = stripeID; +} +#endif /* RF_INCLUDE_RAID5_RS > 0 */ |
