/* $NetBSD: rf_raid4.c,v 1.1 1998/11/13 04:20:33 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 * ***************************************/ /* * : * Log: rf_raid4.c,v * Revision 1.24 1996/07/31 16:56:18 jimz * dataBytesPerStripe, sectorsPerDisk init arch-indep. * * Revision 1.23 1996/07/18 22:57:14 jimz * port simulator to AIX * * Revision 1.22 1996/07/13 00:00:59 jimz * sanitized generalized reconstruction architecture * cleaned up head sep, rbuf problems * * Revision 1.21 1996/06/11 08:54:27 jimz * improved error-checking at configuration time * * Revision 1.20 1996/06/10 11:55:47 jimz * Straightened out some per-array/not-per-array distinctions, fixed * a couple bugs related to confusion. Added shutdown lists. Removed * layout shutdown function (now subsumed by shutdown lists). * * Revision 1.19 1996/06/07 22:26:27 jimz * type-ify which_ru (RF_ReconUnitNum_t) * * Revision 1.18 1996/06/07 21:33:04 jimz * begin using consistent types for sector numbers, * stripe numbers, row+col numbers, recon unit numbers * * Revision 1.17 1996/06/03 23:28:26 jimz * more bugfixes * check in tree to sync for IPDS runs with current bugfixes * there still may be a problem with threads in the script test * getting I/Os stuck- not trivially reproducible (runs ~50 times * in a row without getting stuck) * * Revision 1.16 1996/05/31 22:26:54 jimz * fix a lot of mapping problems, memory allocation problems * found some weird lock issues, fixed 'em * more code cleanup * * Revision 1.15 1996/05/27 18:56:37 jimz * more code cleanup * better typing * compiles in all 3 environments * * Revision 1.14 1996/05/24 01:59:45 jimz * another checkpoint in code cleanup for release * time to sync kernel tree * * Revision 1.13 1996/05/23 00:33:23 jimz * code cleanup: move all debug decls to rf_options.c, all extern * debug decls to rf_options.h, all debug vars preceded by rf_ * * Revision 1.12 1996/05/18 19:51:34 jimz * major code cleanup- fix syntax, make some types consistent, * add prototypes, clean out dead code, et cetera * * Revision 1.11 1996/05/03 19:39:41 wvcii * added includes for dag library * * Revision 1.10 1995/12/12 18:10:06 jimz * MIN -> RF_MIN, MAX -> RF_MAX, ASSERT -> RF_ASSERT * fix 80-column brain damage in comments * * Revision 1.9 1995/12/06 15:02:46 root * added copyright info * * Revision 1.8 1995/11/17 18:57:32 wvcii * added prototyping to MapParity * * Revision 1.7 1995/06/23 13:38:58 robby * updeated to prototypes in rf_layout.h * */ #include "rf_raid.h" #include "rf_dag.h" #include "rf_dagutils.h" #include "rf_dagfuncs.h" #include "rf_dagffrd.h" #include "rf_dagffwr.h" #include "rf_dagdegrd.h" #include "rf_dagdegwr.h" #include "rf_threadid.h" #include "rf_raid4.h" #include "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; inumCol; 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; }