417 lines
14 KiB
C
417 lines
14 KiB
C
/* $NetBSD: rf_psstatus.c,v 1.1 1998/11/13 04:20:32 oster Exp $ */
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/*
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* Copyright (c) 1995 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Mark Holland
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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/*****************************************************************************
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*
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* psstatus.c
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*
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* The reconstruction code maintains a bunch of status related to the parity
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* stripes that are currently under reconstruction. This header file defines
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* the status structures.
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*
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*****************************************************************************/
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/* :
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* Log: rf_psstatus.c,v
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* Revision 1.29 1996/07/27 23:36:08 jimz
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* Solaris port of simulator
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*
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* Revision 1.28 1996/07/15 17:22:18 jimz
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* nit-pick code cleanup
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* resolve stdlib problems on DEC OSF
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*
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* Revision 1.27 1996/07/13 00:00:59 jimz
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* sanitized generalized reconstruction architecture
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* cleaned up head sep, rbuf problems
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*
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* Revision 1.26 1996/06/10 11:55:47 jimz
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* Straightened out some per-array/not-per-array distinctions, fixed
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* a couple bugs related to confusion. Added shutdown lists. Removed
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* layout shutdown function (now subsumed by shutdown lists).
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*
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* Revision 1.25 1996/06/07 22:26:27 jimz
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* type-ify which_ru (RF_ReconUnitNum_t)
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*
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* Revision 1.24 1996/06/07 21:33:04 jimz
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* begin using consistent types for sector numbers,
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* stripe numbers, row+col numbers, recon unit numbers
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*
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* Revision 1.23 1996/06/05 18:06:02 jimz
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* Major code cleanup. The Great Renaming is now done.
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* Better modularity. Better typing. Fixed a bunch of
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* synchronization bugs. Made a lot of global stuff
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* per-desc or per-array. Removed dead code.
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*
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* Revision 1.22 1996/06/02 17:31:48 jimz
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* Moved a lot of global stuff into array structure, where it belongs.
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* Fixed up paritylogging, pss modules in this manner. Some general
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* code cleanup. Removed lots of dead code, some dead files.
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*
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* Revision 1.21 1996/05/30 23:22:16 jimz
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* bugfixes of serialization, timing problems
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* more cleanup
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*
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* Revision 1.20 1996/05/27 18:56:37 jimz
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* more code cleanup
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* better typing
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* compiles in all 3 environments
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*
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* Revision 1.19 1996/05/24 22:17:04 jimz
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* continue code + namespace cleanup
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* typed a bunch of flags
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*
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* Revision 1.18 1996/05/23 21:46:35 jimz
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* checkpoint in code cleanup (release prep)
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* lots of types, function names have been fixed
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*
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* Revision 1.17 1996/05/23 00:33:23 jimz
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* code cleanup: move all debug decls to rf_options.c, all extern
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* debug decls to rf_options.h, all debug vars preceded by rf_
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*
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* Revision 1.16 1996/05/20 16:15:27 jimz
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* switch to rf_{mutex,cond}_{init,destroy}
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*
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* Revision 1.15 1996/05/18 19:51:34 jimz
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* major code cleanup- fix syntax, make some types consistent,
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* add prototypes, clean out dead code, et cetera
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*
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* Revision 1.14 1995/12/12 18:10:06 jimz
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* MIN -> RF_MIN, MAX -> RF_MAX, ASSERT -> RF_ASSERT
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* fix 80-column brain damage in comments
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*
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* Revision 1.13 1995/11/30 16:17:18 wvcii
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* added copyright info
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*
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*/
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#include "rf_types.h"
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#include "rf_raid.h"
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#include "rf_threadid.h"
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#include "rf_general.h"
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#include "rf_debugprint.h"
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#include "rf_freelist.h"
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#include "rf_psstatus.h"
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#include "rf_shutdown.h"
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#include "rf_sys.h"
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#define Dprintf1(s,a) if (rf_pssDebug) rf_debug_printf(s,(void *)((unsigned long)a),NULL,NULL,NULL,NULL,NULL,NULL,NULL)
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#define Dprintf2(s,a,b) if (rf_pssDebug) rf_debug_printf(s,(void *)((unsigned long)a),(void *)((unsigned long)b),NULL,NULL,NULL,NULL,NULL,NULL)
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#define Dprintf3(s,a,b,c) if (rf_pssDebug) rf_debug_printf(s,(void *)((unsigned long)a),(void *)((unsigned long)b),(void *)((unsigned long)c),NULL,NULL,NULL,NULL,NULL)
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static void RealPrintPSStatusTable(RF_Raid_t *raidPtr,
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RF_PSStatusHeader_t *pssTable);
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#define RF_MAX_FREE_PSS 32
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#define RF_PSS_INC 8
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#define RF_PSS_INITIAL 4
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static int init_pss( RF_ReconParityStripeStatus_t *, RF_Raid_t *);
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static void clean_pss(RF_ReconParityStripeStatus_t *, RF_Raid_t *);
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static void rf_ShutdownPSStatus(void *);
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static int init_pss(p, raidPtr)
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RF_ReconParityStripeStatus_t *p;
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RF_Raid_t *raidPtr;
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{
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RF_Calloc(p->issued, raidPtr->numCol, sizeof(char), (char *));
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if (p->issued == NULL)
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return(ENOMEM);
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return(0);
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}
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static void clean_pss(p, raidPtr)
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RF_ReconParityStripeStatus_t *p;
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RF_Raid_t *raidPtr;
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{
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RF_Free(p->issued, raidPtr->numCol*sizeof(char));
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}
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static void rf_ShutdownPSStatus(arg)
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void *arg;
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{
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RF_Raid_t *raidPtr = (RF_Raid_t *)arg;
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RF_FREELIST_DESTROY_CLEAN_ARG(raidPtr->pss_freelist,next,(RF_ReconParityStripeStatus_t *),clean_pss,raidPtr);
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}
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int rf_ConfigurePSStatus(
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RF_ShutdownList_t **listp,
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RF_Raid_t *raidPtr,
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RF_Config_t *cfgPtr)
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{
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int rc;
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raidPtr->pssTableSize = RF_PSS_DEFAULT_TABLESIZE;
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RF_FREELIST_CREATE(raidPtr->pss_freelist, RF_MAX_FREE_PSS,
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RF_PSS_INC, sizeof(RF_ReconParityStripeStatus_t));
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if (raidPtr->pss_freelist == NULL)
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return(ENOMEM);
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rc = rf_ShutdownCreate(listp, rf_ShutdownPSStatus, raidPtr);
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if (rc) {
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RF_ERRORMSG3("Unable to add to shutdown list file %s line %d rc=%d\n",
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__FILE__, __LINE__, rc);
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rf_ShutdownPSStatus(raidPtr);
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return(rc);
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}
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RF_FREELIST_PRIME_INIT_ARG(raidPtr->pss_freelist, RF_PSS_INITIAL,next,
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(RF_ReconParityStripeStatus_t *),init_pss,raidPtr);
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return(0);
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}
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/*****************************************************************************************
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* sets up the pss table
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* We pre-allocate a bunch of entries to avoid as much as possible having to
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* malloc up hash chain entries.
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****************************************************************************************/
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RF_PSStatusHeader_t *rf_MakeParityStripeStatusTable(raidPtr)
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RF_Raid_t *raidPtr;
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{
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RF_PSStatusHeader_t *pssTable;
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int i, j, rc;
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RF_Calloc(pssTable, raidPtr->pssTableSize, sizeof(RF_PSStatusHeader_t), (RF_PSStatusHeader_t *));
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for (i=0; i<raidPtr->pssTableSize; i++) {
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rc = rf_mutex_init(&pssTable[i].mutex);
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if (rc) {
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RF_ERRORMSG3("Unable to init mutex file %s line %d rc=%d\n", __FILE__,
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__LINE__, rc);
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/* fail and deallocate */
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for(j=0;j<i;j++) {
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rf_mutex_destroy(&pssTable[i].mutex);
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}
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RF_Free(pssTable, raidPtr->pssTableSize*sizeof(RF_PSStatusHeader_t));
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return(NULL);
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}
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}
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return(pssTable);
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}
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void rf_FreeParityStripeStatusTable(raidPtr, pssTable)
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RF_Raid_t *raidPtr;
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RF_PSStatusHeader_t *pssTable;
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{
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int i;
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if (rf_pssDebug)
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RealPrintPSStatusTable(raidPtr, pssTable);
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for (i=0; i<raidPtr->pssTableSize; i++) {
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if (pssTable[i].chain) {
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printf("ERROR: pss hash chain not null at recon shutdown\n");
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}
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rf_mutex_destroy(&pssTable[i].mutex);
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}
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RF_Free(pssTable, raidPtr->pssTableSize * sizeof(RF_PSStatusHeader_t));
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}
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/* looks up the status structure for a parity stripe.
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* if the create_flag is on, creates and returns the status structure it it doesn't exist
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* otherwise returns NULL if the status structure does not exist
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*
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* ASSUMES THE PSS DESCRIPTOR IS LOCKED UPON ENTRY
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*/
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RF_ReconParityStripeStatus_t *rf_LookupRUStatus(
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RF_Raid_t *raidPtr,
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RF_PSStatusHeader_t *pssTable,
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RF_StripeNum_t psID,
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RF_ReconUnitNum_t which_ru,
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RF_PSSFlags_t flags, /* whether or not to create it if it doesn't exist + what flags to set initially */
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int *created)
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{
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RF_PSStatusHeader_t *hdr = &pssTable[ RF_HASH_PSID(raidPtr,psID) ];
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RF_ReconParityStripeStatus_t *p, *pssPtr = hdr->chain;
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*created = 0;
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for (p = pssPtr; p; p=p->next) {
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if (p->parityStripeID == psID && p->which_ru == which_ru)
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break;
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}
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if (!p && (flags&RF_PSS_CREATE)) {
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Dprintf2("PSS: creating pss for psid %ld ru %d\n",psID,which_ru);
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p = rf_AllocPSStatus(raidPtr);
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p->next = hdr->chain; hdr->chain = p;
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p->parityStripeID = psID;
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p->which_ru = which_ru;
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p->flags = flags;
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p->rbuf = NULL;
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p->writeRbuf = NULL;
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p->blockCount = 0;
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p->procWaitList = NULL;
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p->blockWaitList = NULL;
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p->bufWaitList = NULL;
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*created = 1;
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} else if (p) { /* we didn't create, but we want to specify some new status */
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p->flags |= flags; /* add in whatever flags we're specifying */
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}
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if (p && (flags & RF_PSS_RECON_BLOCKED)) {
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int tid;
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rf_get_threadid(tid);
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p->blockCount++; /* if we're asking to block recon, bump the count */
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Dprintf3("[%d] Blocked recon on psid %ld. count now %d\n",tid,psID,p->blockCount);
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}
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return(p);
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}
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/* deletes an entry from the parity stripe status table. typically used
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* when an entry has been allocated solely to block reconstruction, and
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* no recon was requested while recon was blocked. Assumes the hash
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* chain is ALREADY LOCKED.
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*/
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void rf_PSStatusDelete(raidPtr, pssTable, pssPtr)
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RF_Raid_t *raidPtr;
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RF_PSStatusHeader_t *pssTable;
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RF_ReconParityStripeStatus_t *pssPtr;
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{
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RF_PSStatusHeader_t *hdr = &(pssTable[ RF_HASH_PSID(raidPtr,pssPtr->parityStripeID) ] );
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RF_ReconParityStripeStatus_t *p = hdr->chain, *pt = NULL;
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while (p) {
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if (p == pssPtr) {
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if (pt) pt->next = p->next; else hdr->chain = p->next;
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p->next = NULL;
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rf_FreePSStatus(raidPtr, p);
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return;
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}
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pt = p; p=p->next;
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}
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RF_ASSERT(0); /* we must find it here */
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}
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/* deletes an entry from the ps status table after reconstruction has completed */
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void rf_RemoveFromActiveReconTable(raidPtr, row, psid, which_ru)
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RF_Raid_t *raidPtr;
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RF_RowCol_t row;
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RF_ReconUnitNum_t which_ru;
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RF_StripeNum_t psid;
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{
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RF_PSStatusHeader_t *hdr = &(raidPtr->reconControl[row]->pssTable[ RF_HASH_PSID(raidPtr,psid) ]);
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RF_ReconParityStripeStatus_t *p, *pt;
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RF_CallbackDesc_t *cb, *cb1;
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RF_LOCK_MUTEX( hdr->mutex );
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for (pt=NULL, p = hdr->chain; p; pt=p,p=p->next) {
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if ((p->parityStripeID == psid) && (p->which_ru == which_ru))
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break;
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}
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if (p == NULL) {
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rf_PrintPSStatusTable(raidPtr, row);
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}
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RF_ASSERT(p); /* it must be there */
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Dprintf2("PSS: deleting pss for psid %ld ru %d\n",psid,which_ru);
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/* delete this entry from the hash chain */
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if (pt) pt->next = p->next;
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else hdr->chain = p->next;
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p->next = NULL;
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RF_UNLOCK_MUTEX( hdr->mutex );
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/* wakup anyone waiting on the parity stripe ID */
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cb = p->procWaitList;
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p->procWaitList = NULL;
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while (cb) {
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Dprintf1("Waking up access waiting on parity stripe ID %ld\n",p->parityStripeID);
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cb1 = cb->next;
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(cb->callbackFunc)(cb->callbackArg);
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/* THIS IS WHAT THE ORIGINAL CODE HAD... the extra 0 is bogus, IMHO */
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/* (cb->callbackFunc)(cb->callbackArg, 0); */
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rf_FreeCallbackDesc(cb);
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cb = cb1;
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}
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rf_FreePSStatus(raidPtr, p);
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}
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RF_ReconParityStripeStatus_t *rf_AllocPSStatus(raidPtr)
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RF_Raid_t *raidPtr;
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{
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RF_ReconParityStripeStatus_t *p;
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RF_FREELIST_GET_INIT_ARG(raidPtr->pss_freelist,p,next,(RF_ReconParityStripeStatus_t *),init_pss,raidPtr);
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if (p) {
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bzero(p->issued, raidPtr->numCol);
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}
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p->next = NULL;
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/* no need to initialize here b/c the only place we're called from is the above Lookup */
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return(p);
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}
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void rf_FreePSStatus(raidPtr, p)
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RF_Raid_t *raidPtr;
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RF_ReconParityStripeStatus_t *p;
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{
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RF_ASSERT(p->procWaitList == NULL);
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RF_ASSERT(p->blockWaitList == NULL);
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RF_ASSERT(p->bufWaitList == NULL);
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RF_FREELIST_FREE_CLEAN_ARG(raidPtr->pss_freelist,p,next,clean_pss,raidPtr);
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}
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static void RealPrintPSStatusTable(raidPtr, pssTable)
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RF_Raid_t *raidPtr;
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RF_PSStatusHeader_t *pssTable;
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{
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int i, j, procsWaiting, blocksWaiting, bufsWaiting;
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RF_ReconParityStripeStatus_t *p;
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RF_CallbackDesc_t *cb;
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printf("\nParity Stripe Status Table\n");
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for (i=0; i< raidPtr->pssTableSize; i++) {
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for (p = pssTable[i].chain; p; p=p->next) {
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procsWaiting = blocksWaiting = bufsWaiting = 0;
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for (cb = p->procWaitList; cb; cb=cb->next) procsWaiting++;
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for (cb = p->blockWaitList; cb; cb=cb->next) blocksWaiting++;
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for (cb = p->bufWaitList; cb; cb=cb->next) bufsWaiting++;
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printf("PSID %ld RU %d : blockCount %d %d/%d/%d proc/block/buf waiting, issued ",
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(long)p->parityStripeID, p->which_ru, p->blockCount, procsWaiting, blocksWaiting, bufsWaiting);
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for (j=0;j<raidPtr->numCol; j++) printf("%c", (p->issued[j]) ? '1' : '0');
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if (!p->flags) printf(" flags: (none)");
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else {
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if (p->flags & RF_PSS_UNDER_RECON) printf(" under-recon");
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if (p->flags & RF_PSS_FORCED_ON_WRITE) printf(" forced-w");
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if (p->flags & RF_PSS_FORCED_ON_READ) printf(" forced-r");
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if (p->flags & RF_PSS_RECON_BLOCKED) printf(" blocked");
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if (p->flags & RF_PSS_BUFFERWAIT) printf(" bufwait");
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}
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printf("\n");
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}
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}
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}
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void rf_PrintPSStatusTable(raidPtr, row)
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RF_Raid_t *raidPtr;
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RF_RowCol_t row;
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{
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RF_PSStatusHeader_t *pssTable = raidPtr->reconControl[row]->pssTable;
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RealPrintPSStatusTable(raidPtr, pssTable);
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}
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