rf_layout.c

RAIDFrame是个非常好的磁盘阵列RAID仿真工具

/*
 * Copyright (c) 1995 Carnegie-Mellon University.
 * All rights reserved.
 *
 * Author: Mark Holland
 *
 * 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  [e-mail]
 *  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_layout.c -- driver code dealing with layout and mapping issues
 */

/*
 * $Locker:  $
 * $Log: rf_layout.c,v $
 * Revision 1.71  1996/08/20  22:41:30  jimz
 * add declustered evenodd
 *
 * Revision 1.70  1996/07/31  16:56:18  jimz
 * dataBytesPerStripe, sectorsPerDisk init arch-indep.
 *
 * Revision 1.69  1996/07/31  15:34:46  jimz
 * add EvenOdd
 *
 * Revision 1.68  1996/07/29  14:05:12  jimz
 * fix numPUs/numRUs confusion (everything is now numRUs)
 * clean up some commenting, return values
 *
 * Revision 1.67  1996/07/27  23:36:08  jimz
 * Solaris port of simulator
 *
 * Revision 1.66  1996/07/27  18:40:24  jimz
 * cleanup sweep
 *
 * Revision 1.65  1996/07/18  22:57:14  jimz
 * port simulator to AIX
 *
 * Revision 1.64  1996/07/15  17:22:18  jimz
 * nit-pick code cleanup
 * resolve stdlib problems on DEC OSF
 *
 * Revision 1.63  1996/07/13  00:00:59  jimz
 * sanitized generalized reconstruction architecture
 * cleaned up head sep, rbuf problems
 *
 * Revision 1.62  1996/07/11  19:08:00  jimz
 * generalize reconstruction mechanism
 * allow raid1 reconstructs via copyback (done with array
 * quiesced, not online, therefore not disk-directed)
 *
 * Revision 1.61  1996/06/19  22:23:01  jimz
 * parity verification is now a layout-configurable thing
 * not all layouts currently support it (correctly, anyway)
 *
 * Revision 1.60  1996/06/19  17:53:48  jimz
 * move GetNumSparePUs, InstallSpareTable ops into layout switch
 *
 * Revision 1.59  1996/06/19  14:57:58  jimz
 * move layout-specific config parsing hooks into RF_LayoutSW_t
 * table in rf_layout.c
 *
 * Revision 1.58  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 1.57  1996/06/07  22:26:27  jimz
 * type-ify which_ru (RF_ReconUnitNum_t)
 *
 * Revision 1.56  1996/06/07  21:33:04  jimz
 * begin using consistent types for sector numbers,
 * stripe numbers, row+col numbers, recon unit numbers
 *
 * Revision 1.55  1996/06/06  18:41:35  jimz
 * change interleaved declustering dag selection to an
 * interleaved-declustering-specific routine (so we can
 * use the partitioned mirror node)
 *
 * Revision 1.54  1996/06/05  18:06:02  jimz
 * Major code cleanup. The Great Renaming is now done.
 * Better modularity. Better typing. Fixed a bunch of
 * synchronization bugs. Made a lot of global stuff
 * per-desc or per-array. Removed dead code.
 *
 * Revision 1.53  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 1.52  1996/06/02  17:31:48  jimz
 * Moved a lot of global stuff into array structure, where it belongs.
 * Fixed up paritylogging, pss modules in this manner. Some general
 * code cleanup. Removed lots of dead code, some dead files.
 *
 * Revision 1.51  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 1.50  1996/05/30  23:22:16  jimz
 * bugfixes of serialization, timing problems
 * more cleanup
 *
 * Revision 1.49  1996/05/30  11:29:41  jimz
 * Numerous bug fixes. Stripe lock release code disagreed with the taking code
 * about when stripes should be locked (I made it consistent: no parity, no lock)
 * There was a lot of extra serialization of I/Os which I've removed- a lot of
 * it was to calculate values for the cache code, which is no longer with us.
 * More types, function, macro cleanup. Added code to properly quiesce the array
 * on shutdown. Made a lot of stuff array-specific which was (bogusly) general
 * before. Fixed memory allocation, freeing bugs.
 *
 * Revision 1.48  1996/05/27  18:56:37  jimz
 * more code cleanup
 * better typing
 * compiles in all 3 environments
 *
 * Revision 1.47  1996/05/24  22:17:04  jimz
 * continue code + namespace cleanup
 * typed a bunch of flags
 *
 * Revision 1.46  1996/05/24  01:59:45  jimz
 * another checkpoint in code cleanup for release
 * time to sync kernel tree
 *
 * Revision 1.45  1996/05/23  21:46:35  jimz
 * checkpoint in code cleanup (release prep)
 * lots of types, function names have been fixed
 *
 * Revision 1.44  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 1.43  1996/02/22  16:46:35  amiri
 * modified chained declustering to use a seperate DAG selection routine
 *
 * Revision 1.42  1995/12/01  19:16:11  root
 * added copyright info
 *
 * Revision 1.41  1995/11/28  21:31:02  amiri
 * added Interleaved Declustering to switch table
 *
 * Revision 1.40  1995/11/20  14:35:17  arw
 * moved rf_StartThroughputStats in DefaultWrite and DefaultRead
 *
 * Revision 1.39  1995/11/19  16:28:46  wvcii
 * replaced LaunchDAGState with CreateDAGState, ExecuteDAGState
 *
 * Revision 1.38  1995/11/17  19:00:41  wvcii
 * added MapQ entries to switch table
 *
 * Revision 1.37  1995/11/17  16:58:13  amiri
 * Added the Chained Declustering architecture ('C'),
 * essentially a variant of mirroring.
 *
 * Revision 1.36  1995/11/16  16:16:10  amiri
 * Added RAID5 with rotated sparing ('R' configuration)
 *
 * Revision 1.35  1995/11/07  15:41:17  wvcii
 * modified state lists: DefaultStates, VSReadStates
 * necessary to support new states (LaunchDAGState, ProcessDAGState)
 *
 * Revision 1.34  1995/10/18  01:23:20  amiri
 * added ifndef SIMULATE wrapper around rf_StartThroughputStats()
 *
 * Revision 1.33  1995/10/13  15:05:46  arw
 * added rf_StartThroughputStats to DefaultRead and DefaultWrite
 *
 * Revision 1.32  1995/10/12  16:04:23  jimz
 * added config names to mapsw entires
 *
 * Revision 1.31  1995/10/04  03:57:48  wvcii
 * added raid level 1 to mapsw
 *
 * Revision 1.30  1995/09/07  01:26:55  jimz
 * Achive basic compilation in kernel. Kernel functionality
 * is not guaranteed at all, but it'll compile. Mostly. I hope.
 *
 * Revision 1.29  1995/07/28  21:43:42  robby
 * checkin after leaving for Rice. Bye
 *
 * Revision 1.28  1995/07/26  03:26:14  robby
 * *** empty log message ***
 *
 * Revision 1.27  1995/07/21  19:47:52  rachad
 * Added raid 0 /5 with caching architectures
 *
 * Revision 1.26  1995/07/21  19:29:27  robby
 * added virtual striping states
 *
 * Revision 1.25  1995/07/10  21:41:47  robby
 * switched to have my own virtual stripng write function from the cache
 *
 * Revision 1.24  1995/07/10  20:51:59  robby
 * added virtual striping states
 *
 * Revision 1.23  1995/07/10  16:57:42  robby
 * updated alloclistelem struct to the correct struct name
 *
 * Revision 1.22  1995/07/08  20:06:11  rachad
 * *** empty log message ***
 *
 * Revision 1.21  1995/07/08  19:43:16  cfb
 * *** empty log message ***
 *
 * Revision 1.20  1995/07/08  18:05:39  rachad
 * Linked up Claudsons code with the real cache
 *
 * Revision 1.19  1995/07/06  14:29:36  robby
 * added defaults states list to the layout switch
 *
 * Revision 1.18  1995/06/23  13:40:34  robby
 * updeated to prototypes in rf_layout.h
 *
 */

#include "rf_types.h"
#include "rf_archs.h"
#include "rf_raid.h"
#include "rf_configure.h"
#include "rf_dag.h"
#include "rf_desc.h"
#include "rf_decluster.h"
#include "rf_pq.h"
#include "rf_declusterPQ.h"
#include "rf_raid0.h"
#include "rf_raid1.h"
#include "rf_raid4.h"
#include "rf_raid5.h"
#include "rf_states.h"
#if RF_INCLUDE_RAID5_RS > 0
#include "rf_raid5_rotatedspare.h"
#endif /* RF_INCLUDE_RAID5_RS > 0 */
#if RF_INCLUDE_CHAINDECLUSTER > 0
#include "rf_chaindecluster.h"
#endif /* RF_INCLUDE_CHAINDECLUSTER > 0 */
#if RF_INCLUDE_INTERDECLUSTER > 0
#include "rf_interdecluster.h"
#endif /* RF_INCLUDE_INTERDECLUSTER > 0 */
#if RF_INCLUDE_PARITYLOGGING > 0
#include "rf_paritylogging.h"
#endif /* RF_INCLUDE_PARITYLOGGING > 0 */
#if RF_INCLUDE_EVENODD > 0
#include "rf_evenodd.h"
#endif /* RF_INCLUDE_EVENODD > 0 */
#include "rf_general.h"
#include "rf_driver.h"
#include "rf_parityscan.h"
#include "rf_reconbuffer.h"
#include "rf_reconutil.h"

/***********************************************************************
 *
 * the layout switch defines all the layouts that are supported.
 *    fields are: layout ID, init routine, shutdown routine, map
 *    sector, map parity, identify stripe, dag selection, map stripeid
 *    to parity stripe id (optional), num faults tolerated, special
 *    flags.
 *
 ***********************************************************************/

static RF_AccessState_t DefaultStates[] = {rf_QuiesceState,
	rf_IncrAccessesCountState, rf_MapState, rf_LockState, rf_CreateDAGState,
	rf_ExecuteDAGState, rf_ProcessDAGState, rf_DecrAccessesCountState,
	rf_CleanupState, rf_LastState};

static int distSpareYes = 1;
static int distSpareNo  = 0;

#ifdef KERNEL
#define RF_NK2(a,b)
#else /* KERNEL */
#define RF_NK2(a,b) a,b,
#endif /* KERNEL */

#if RF_UTILITY > 0
#define RF_NU(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p)
#else /* RF_UTILITY > 0 */
#define RF_NU(a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p) a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p
#endif /* RF_UTILITY > 0 */

static RF_LayoutSW_t mapsw[] = {
	/* parity declustering */
	{'T', "Parity declustering",
	RF_NK2(rf_MakeLayoutSpecificDeclustered, &distSpareNo)
	RF_NU(
	rf_ConfigureDeclustered,
	rf_MapSectorDeclustered, rf_MapParityDeclustered, NULL,
	rf_IdentifyStripeDeclustered,
	rf_RaidFiveDagSelect,
	rf_MapSIDToPSIDDeclustered,
	rf_GetDefaultHeadSepLimitDeclustered,
	rf_GetDefaultNumFloatingReconBuffersDeclustered,
	NULL, NULL,
	rf_SubmitReconBufferBasic,
	rf_VerifyParityBasic,
	1,
	DefaultStates,
	0)
	},

	/* parity declustering with distributed sparing */
	{'D', "Distributed sparing parity declustering",
	RF_NK2(rf_MakeLayoutSpecificDeclustered, &distSpareYes)
	RF_NU(
	rf_ConfigureDeclusteredDS,
	rf_MapSectorDeclustered, rf_MapParityDeclustered, NULL,
	rf_IdentifyStripeDeclustered,
	rf_RaidFiveDagSelect,
	rf_MapSIDToPSIDDeclustered,
	rf_GetDefaultHeadSepLimitDeclustered,
	rf_GetDefaultNumFloatingReconBuffersDeclustered,
	rf_GetNumSpareRUsDeclustered, rf_InstallSpareTable,
	rf_SubmitReconBufferBasic,
	rf_VerifyParityBasic,
	1,
	DefaultStates,
	RF_DISTRIBUTE_SPARE|RF_BD_DECLUSTERED)
	},

#if RF_INCLUDE_DECL_PQ > 0
	/* declustered P+Q */
	{'Q', "Declustered P+Q",
	RF_NK2(rf_MakeLayoutSpecificDeclustered, &distSpareNo)
	RF_NU(
	rf_ConfigureDeclusteredPQ,
	rf_MapSectorDeclusteredPQ, rf_MapParityDeclusteredPQ, rf_MapQDeclusteredPQ,
	rf_IdentifyStripeDeclusteredPQ,
	rf_PQDagSelect,
	rf_MapSIDToPSIDDeclustered,
	rf_GetDefaultHeadSepLimitDeclustered,
	rf_GetDefaultNumFloatingReconBuffersPQ,