376 lines
11 KiB
C
376 lines
11 KiB
C
/* $NetBSD: rf_psstatus.c,v 1.5 2000/01/08 22:57:31 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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#include "rf_types.h"
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#include "rf_raid.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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#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
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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
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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
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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
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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
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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 *
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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
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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 *
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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
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* 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;
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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
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if (p) { /* we didn't create, but we want to specify
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* some new status */
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p->flags |= flags; /* add in whatever flags we're
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* specifying */
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}
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if (p && (flags & RF_PSS_RECON_BLOCKED)) {
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p->blockCount++;/* if we're asking to block recon, bump the
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* count */
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Dprintf3("raid%d: Blocked recon on psid %ld. count now %d\n",
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raidPtr->raidid, 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
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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)
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pt->next = p->next;
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else
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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;
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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
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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)
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pt->next = p->next;
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else
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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,
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* 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 *
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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
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* the above Lookup */
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return (p);
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}
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void
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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
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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)
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procsWaiting++;
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for (cb = p->blockWaitList; cb; cb = cb->next)
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blocksWaiting++;
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for (cb = p->bufWaitList; cb; cb = cb->next)
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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++)
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printf("%c", (p->issued[j]) ? '1' : '0');
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if (!p->flags)
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printf(" flags: (none)");
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else {
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if (p->flags & RF_PSS_UNDER_RECON)
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printf(" under-recon");
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if (p->flags & RF_PSS_FORCED_ON_WRITE)
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printf(" forced-w");
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if (p->flags & RF_PSS_FORCED_ON_READ)
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printf(" forced-r");
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if (p->flags & RF_PSS_RECON_BLOCKED)
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printf(" blocked");
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if (p->flags & RF_PSS_BUFFERWAIT)
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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
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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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