FreeBSD/Linux Kernel Cross Reference
sys/dev/raidframe/rf_raid4.c

     /*      $NetBSD: rf_raid4.c,v 1.8 2003/12/30 21:59:03 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 <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: rf_raid4.c,v 1.8 2003/12/30 21:59:03 oster Exp $");
    
    #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_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; i < raidPtr->numCol; i++)
                    info->stripeIdentifier[i] = i;
    
            /* fill in the remaining layout parameters */
            layoutPtr->numStripe = layoutPtr->stripeUnitsPerDisk;
            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 *col, RF_SectorNum_t *diskSector, int remap)
   {
           RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
           *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 *col, RF_SectorNum_t *diskSector, int remap)
   {
           RF_StripeNum_t SUID = raidSector / raidPtr->Layout.sectorsPerStripeUnit;
   
           *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_Raid4ConfigInfo_t *info = raidPtr->Layout.layoutSpecificInfo;
   
           *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;
   }

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