rf_layout.c

RAIDFrame是个非常好的磁盘阵列RAID仿真工具

	NULL, NULL,
	NULL,
	rf_VerifyParityBasic,
	2,
	DefaultStates,
	0)
	},
#endif /* RF_INCLUDE_DECL_PQ > 0 */

#if RF_INCLUDE_RAID5_RS > 0
	/* RAID 5 with rotated sparing */
	{'R', "RAID Level 5 rotated sparing",
	RF_NK2(rf_MakeLayoutSpecificNULL, NULL)
	RF_NU(
	rf_ConfigureRAID5_RS,
	rf_MapSectorRAID5_RS, rf_MapParityRAID5_RS, NULL,
	rf_IdentifyStripeRAID5_RS,
	rf_RaidFiveDagSelect,
	rf_MapSIDToPSIDRAID5_RS,
	rf_GetDefaultHeadSepLimitRAID5,
	rf_GetDefaultNumFloatingReconBuffersRAID5,
	rf_GetNumSpareRUsRAID5_RS, NULL,
	rf_SubmitReconBufferBasic,
	rf_VerifyParityBasic,
	1,
	DefaultStates,
	RF_DISTRIBUTE_SPARE)
	},
#endif /* RF_INCLUDE_RAID5_RS > 0 */

#if RF_INCLUDE_CHAINDECLUSTER > 0
	/* Chained Declustering */
	{'C', "Chained Declustering",
	RF_NK2(rf_MakeLayoutSpecificNULL, NULL)
	RF_NU(
	rf_ConfigureChainDecluster,
	rf_MapSectorChainDecluster, rf_MapParityChainDecluster, NULL,
	rf_IdentifyStripeChainDecluster,
	rf_RAIDCDagSelect,
	rf_MapSIDToPSIDChainDecluster,
	NULL,
	NULL,
	rf_GetNumSpareRUsChainDecluster, NULL,
	rf_SubmitReconBufferBasic,
	rf_VerifyParityBasic,
	1,
	DefaultStates,
	0)
	},
#endif /* RF_INCLUDE_CHAINDECLUSTER > 0 */

#if RF_INCLUDE_INTERDECLUSTER > 0
	/* Interleaved Declustering */
	{'I', "Interleaved Declustering",
	RF_NK2(rf_MakeLayoutSpecificNULL, NULL)
	RF_NU(
	rf_ConfigureInterDecluster,
	rf_MapSectorInterDecluster, rf_MapParityInterDecluster, NULL,
	rf_IdentifyStripeInterDecluster,
	rf_RAIDIDagSelect,
	rf_MapSIDToPSIDInterDecluster,
	rf_GetDefaultHeadSepLimitInterDecluster,
	rf_GetDefaultNumFloatingReconBuffersInterDecluster,
	rf_GetNumSpareRUsInterDecluster, NULL,
	rf_SubmitReconBufferBasic,
	rf_VerifyParityBasic,
	1,
	DefaultStates,
	RF_DISTRIBUTE_SPARE)
	},
#endif /* RF_INCLUDE_INTERDECLUSTER > 0 */

#if RF_INCLUDE_RAID0 > 0
	/* RAID level 0 */
	{'0', "RAID Level 0",
	RF_NK2(rf_MakeLayoutSpecificNULL, NULL)
	RF_NU(
	rf_ConfigureRAID0,
	rf_MapSectorRAID0, rf_MapParityRAID0, NULL,
	rf_IdentifyStripeRAID0,
	rf_RAID0DagSelect,
	rf_MapSIDToPSIDRAID0,
	NULL,
	NULL,
	NULL, NULL,
	NULL,
	rf_VerifyParityRAID0,
	0,
	DefaultStates,
	0)
	},
#endif /* RF_INCLUDE_RAID0 > 0 */

#if RF_INCLUDE_RAID1 > 0
	/* RAID level 1 */
	{'1', "RAID Level 1",
	RF_NK2(rf_MakeLayoutSpecificNULL, NULL)
	RF_NU(
	rf_ConfigureRAID1,
	rf_MapSectorRAID1, rf_MapParityRAID1, NULL,
	rf_IdentifyStripeRAID1,
	rf_RAID1DagSelect,
	rf_MapSIDToPSIDRAID1,
	NULL,
	NULL,
	NULL, NULL,
	rf_SubmitReconBufferRAID1,
	rf_VerifyParityRAID1,
	1,
	DefaultStates,
	0)
	},
#endif /* RF_INCLUDE_RAID1 > 0 */

#if RF_INCLUDE_RAID4 > 0
	/* RAID level 4 */
	{'4', "RAID Level 4",
	RF_NK2(rf_MakeLayoutSpecificNULL, NULL)
	RF_NU(
	rf_ConfigureRAID4,
	rf_MapSectorRAID4, rf_MapParityRAID4, NULL,
	rf_IdentifyStripeRAID4,
	rf_RaidFiveDagSelect,
	rf_MapSIDToPSIDRAID4,
	rf_GetDefaultHeadSepLimitRAID4,
	rf_GetDefaultNumFloatingReconBuffersRAID4,
	NULL, NULL,
	rf_SubmitReconBufferBasic,
	rf_VerifyParityBasic,
	1,
	DefaultStates,
	0)
	},
#endif /* RF_INCLUDE_RAID4 > 0 */

#if RF_INCLUDE_RAID5 > 0
	/* RAID level 5 */
	{'5', "RAID Level 5",
	RF_NK2(rf_MakeLayoutSpecificNULL, NULL)
	RF_NU(
	rf_ConfigureRAID5,
	rf_MapSectorRAID5, rf_MapParityRAID5, NULL,
	rf_IdentifyStripeRAID5,
	rf_RaidFiveDagSelect,
	rf_MapSIDToPSIDRAID5,
	rf_GetDefaultHeadSepLimitRAID5,
	rf_GetDefaultNumFloatingReconBuffersRAID5,
	NULL, NULL,
	rf_SubmitReconBufferBasic,
	rf_VerifyParityBasic,
	1,
	DefaultStates,
	0)
	},
#endif /* RF_INCLUDE_RAID5 > 0 */

#if RF_INCLUDE_EVENODD > 0
	/* Evenodd */
	{'E', "EvenOdd",
	RF_NK2(rf_MakeLayoutSpecificNULL, NULL)
	RF_NU(
	rf_ConfigureEvenOdd,
	rf_MapSectorRAID5, rf_MapParityEvenOdd, rf_MapEEvenOdd, 
	rf_IdentifyStripeEvenOdd,
	rf_EODagSelect,
	rf_MapSIDToPSIDRAID5,
	NULL,
	NULL,
	NULL, NULL,
	NULL, /* no reconstruction, yet */
	rf_VerifyParityEvenOdd,
	2,
	DefaultStates,
	0)
	},
#endif /* RF_INCLUDE_EVENODD > 0 */

#if RF_INCLUDE_EVENODD > 0
	/* Declustered Evenodd */
	{'e', "Declustered EvenOdd",
	RF_NK2(rf_MakeLayoutSpecificDeclustered, &distSpareNo)
	RF_NU(
	rf_ConfigureDeclusteredPQ,
	rf_MapSectorDeclusteredPQ, rf_MapParityDeclusteredPQ, rf_MapQDeclusteredPQ,
	rf_IdentifyStripeDeclusteredPQ,
	rf_EODagSelect,
	rf_MapSIDToPSIDRAID5,
	rf_GetDefaultHeadSepLimitDeclustered,
	rf_GetDefaultNumFloatingReconBuffersPQ,
	NULL, NULL,
	NULL, /* no reconstruction, yet */
	rf_VerifyParityEvenOdd,
	2,
	DefaultStates,
	0)
	},
#endif /* RF_INCLUDE_EVENODD > 0 */

#if RF_INCLUDE_PARITYLOGGING > 0
	/* parity logging */
	{'L', "Parity logging",
	RF_NK2(rf_MakeLayoutSpecificNULL, NULL)
	RF_NU(
	rf_ConfigureParityLogging,
	rf_MapSectorParityLogging, rf_MapParityParityLogging, NULL,
	rf_IdentifyStripeParityLogging,
	rf_ParityLoggingDagSelect,
	rf_MapSIDToPSIDParityLogging,
	rf_GetDefaultHeadSepLimitParityLogging,
	rf_GetDefaultNumFloatingReconBuffersParityLogging,
	NULL, NULL,
	rf_SubmitReconBufferBasic,
	NULL,
	1,
	DefaultStates,
	0)
	},
#endif /* RF_INCLUDE_PARITYLOGGING > 0 */

	/* end-of-list marker */
	{ '\0', NULL,
	RF_NK2(NULL, NULL)
	RF_NU(
	NULL,
	NULL, NULL, NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL,
	NULL, NULL,
	NULL,
	NULL,
	0,
	NULL,
	0)
	}
};

RF_LayoutSW_t *rf_GetLayout(RF_ParityConfig_t parityConfig)
{
  RF_LayoutSW_t *p;

  /* look up the specific layout */
  for (p=&mapsw[0]; p->parityConfig; p++) 
    if (p->parityConfig == parityConfig)
      break;
  if (!p->parityConfig)
    return(NULL);
  RF_ASSERT(p->parityConfig == parityConfig);
  return(p);
}

#if RF_UTILITY == 0
/*****************************************************************************************
 *
 * ConfigureLayout -- 
 *
 * read the configuration file and set up the RAID layout parameters.  After reading
 * common params, invokes the layout-specific configuration routine to finish
 * the configuration.
 *
 ****************************************************************************************/
int rf_ConfigureLayout(
  RF_ShutdownList_t  **listp,
  RF_Raid_t           *raidPtr,
  RF_Config_t         *cfgPtr)
{
  RF_RaidLayout_t *layoutPtr = &(raidPtr->Layout);
  RF_ParityConfig_t parityConfig;
  RF_LayoutSW_t *p;
  int retval;

  layoutPtr->sectorsPerStripeUnit = cfgPtr->sectPerSU;
  layoutPtr->SUsPerPU             = cfgPtr->SUsPerPU;
  layoutPtr->SUsPerRU             = cfgPtr->SUsPerRU;
  parityConfig                    = cfgPtr->parityConfig;
    
  layoutPtr->stripeUnitsPerDisk = raidPtr->sectorsPerDisk / layoutPtr->sectorsPerStripeUnit;

  p = rf_GetLayout(parityConfig);
  if (p == NULL) {
    RF_ERRORMSG1("Unknown parity configuration '%c'", parityConfig);
    return(EINVAL);
  }
  RF_ASSERT(p->parityConfig == parityConfig);
  layoutPtr->map = p;

  /* initialize the specific layout */
  retval = (p->Configure)(listp, raidPtr, cfgPtr);
  if (retval)
    return(retval);

  layoutPtr->dataBytesPerStripe = layoutPtr->dataSectorsPerStripe << raidPtr->logBytesPerSector;
  raidPtr->sectorsPerDisk = layoutPtr->stripeUnitsPerDisk * layoutPtr->sectorsPerStripeUnit;

  if (rf_forceNumFloatingReconBufs >= 0) {
    raidPtr->numFloatingReconBufs = rf_forceNumFloatingReconBufs;
  }
  else {
    raidPtr->numFloatingReconBufs = rf_GetDefaultNumFloatingReconBuffers(raidPtr);
  }

  if (rf_forceHeadSepLimit >= 0) {
    raidPtr->headSepLimit = rf_forceHeadSepLimit;
  }
  else {
    raidPtr->headSepLimit = rf_GetDefaultHeadSepLimit(raidPtr);
  }

  printf("RAIDFRAME: Configure (%s): total number of sectors is %lu (%lu MB)\n",
     layoutPtr->map->configName,
     (unsigned long)raidPtr->totalSectors,
     (unsigned long)(raidPtr->totalSectors / 1024 * (1<<raidPtr->logBytesPerSector) / 1024));
  if (raidPtr->headSepLimit >= 0) {
    printf("RAIDFRAME(%s): Using %ld floating recon bufs with head sep limit %ld\n",
      layoutPtr->map->configName, (long)raidPtr->numFloatingReconBufs, (long)raidPtr->headSepLimit);
  }
  else {
    printf("RAIDFRAME(%s): Using %ld floating recon bufs with no head sep limit\n",
      layoutPtr->map->configName, (long)raidPtr->numFloatingReconBufs);
  }

  return(0);
}

/* typically there is a 1-1 mapping between stripes and parity stripes.
 * however, the declustering code supports packing multiple stripes into
 * a single parity stripe, so as to increase the size of the reconstruction
 * unit without affecting the size of the stripe unit.  This routine finds
 * the parity stripe identifier associated with a stripe ID.  There is also
 * a RaidAddressToParityStripeID macro in layout.h
 */
RF_StripeNum_t rf_MapStripeIDToParityStripeID(layoutPtr, stripeID, which_ru)
  RF_RaidLayout_t    *layoutPtr;
  RF_StripeNum_t      stripeID;
  RF_ReconUnitNum_t  *which_ru;
{
  RF_StripeNum_t parityStripeID;

  /* quick exit in the common case of SUsPerPU==1 */
  if ((layoutPtr->SUsPerPU == 1) || !layoutPtr->map->MapSIDToPSID) {
    *which_ru = 0;
    return(stripeID);
  }
  else {
    (layoutPtr->map->MapSIDToPSID)(layoutPtr, stripeID, &parityStripeID, which_ru);
  }
  return(parityStripeID);
}
#endif /* RF_UTILITY == 0 */