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world. This should be considered highly experimental. Approved-by: re
668 lines
18 KiB
C
668 lines
18 KiB
C
/* $FreeBSD$ */
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/* $NetBSD: rf_states.c,v 1.15 2000/10/20 02:24:45 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, William V. Courtright II, Robby Findler
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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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#include <sys/errno.h>
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#include <dev/raidframe/rf_archs.h>
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#include <dev/raidframe/rf_threadstuff.h>
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#include <dev/raidframe/rf_raid.h>
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#include <dev/raidframe/rf_dag.h>
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#include <dev/raidframe/rf_desc.h>
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#include <dev/raidframe/rf_aselect.h>
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#include <dev/raidframe/rf_general.h>
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#include <dev/raidframe/rf_states.h>
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#include <dev/raidframe/rf_dagutils.h>
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#include <dev/raidframe/rf_driver.h>
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#include <dev/raidframe/rf_engine.h>
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#include <dev/raidframe/rf_map.h>
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#include <dev/raidframe/rf_etimer.h>
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#include <dev/raidframe/rf_kintf.h>
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/* prototypes for some of the available states.
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States must:
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- not block.
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- either schedule rf_ContinueRaidAccess as a callback and return
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RF_TRUE, or complete all of their work and return RF_FALSE.
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- increment desc->state when they have finished their work.
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*/
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static char *
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StateName(RF_AccessState_t state)
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{
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switch (state) {
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case rf_QuiesceState:return "QuiesceState";
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case rf_MapState:
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return "MapState";
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case rf_LockState:
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return "LockState";
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case rf_CreateDAGState:
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return "CreateDAGState";
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case rf_ExecuteDAGState:
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return "ExecuteDAGState";
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case rf_ProcessDAGState:
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return "ProcessDAGState";
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case rf_CleanupState:
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return "CleanupState";
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case rf_LastState:
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return "LastState";
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case rf_IncrAccessesCountState:
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return "IncrAccessesCountState";
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case rf_DecrAccessesCountState:
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return "DecrAccessesCountState";
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default:
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return "!!! UnnamedState !!!";
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}
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}
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void
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rf_ContinueRaidAccess(RF_RaidAccessDesc_t * desc)
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{
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int suspended = RF_FALSE;
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int current_state_index = desc->state;
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RF_AccessState_t current_state = desc->states[current_state_index];
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int unit = desc->raidPtr->raidid;
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do {
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current_state_index = desc->state;
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current_state = desc->states[current_state_index];
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switch (current_state) {
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case rf_QuiesceState:
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suspended = rf_State_Quiesce(desc);
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break;
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case rf_IncrAccessesCountState:
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suspended = rf_State_IncrAccessCount(desc);
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break;
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case rf_MapState:
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suspended = rf_State_Map(desc);
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break;
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case rf_LockState:
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suspended = rf_State_Lock(desc);
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break;
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case rf_CreateDAGState:
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suspended = rf_State_CreateDAG(desc);
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break;
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case rf_ExecuteDAGState:
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suspended = rf_State_ExecuteDAG(desc);
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break;
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case rf_ProcessDAGState:
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suspended = rf_State_ProcessDAG(desc);
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break;
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case rf_CleanupState:
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suspended = rf_State_Cleanup(desc);
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break;
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case rf_DecrAccessesCountState:
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suspended = rf_State_DecrAccessCount(desc);
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break;
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case rf_LastState:
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suspended = rf_State_LastState(desc);
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break;
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}
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/* after this point, we cannot dereference desc since desc may
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* have been freed. desc is only freed in LastState, so if we
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* renter this function or loop back up, desc should be valid. */
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if (rf_printStatesDebug) {
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printf("raid%d: State: %-24s StateIndex: %3i desc: 0x%ld %s\n",
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unit, StateName(current_state),
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current_state_index, (long) desc,
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suspended ? "callback scheduled" : "looping");
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}
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} while (!suspended && current_state != rf_LastState);
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return;
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}
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void
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rf_ContinueDagAccess(RF_DagList_t * dagList)
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{
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RF_AccTraceEntry_t *tracerec = &(dagList->desc->tracerec);
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RF_RaidAccessDesc_t *desc;
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RF_DagHeader_t *dag_h;
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RF_Etimer_t timer;
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int i;
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desc = dagList->desc;
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timer = tracerec->timer;
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RF_ETIMER_STOP(timer);
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RF_ETIMER_EVAL(timer);
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tracerec->specific.user.exec_us = RF_ETIMER_VAL_US(timer);
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RF_ETIMER_START(tracerec->timer);
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/* skip to dag which just finished */
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dag_h = dagList->dags;
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for (i = 0; i < dagList->numDagsDone; i++) {
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dag_h = dag_h->next;
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}
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/* check to see if retry is required */
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if (dag_h->status == rf_rollBackward) {
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/* when a dag fails, mark desc status as bad and allow all
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* other dags in the desc to execute to completion. then,
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* free all dags and start over */
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desc->status = 1; /* bad status */
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{
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printf("raid%d: DAG failure: %c addr 0x%lx (%ld) nblk 0x%x (%d) buf 0x%lx\n",
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desc->raidPtr->raidid, desc->type,
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(long) desc->raidAddress,
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(long) desc->raidAddress, (int) desc->numBlocks,
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(int) desc->numBlocks,
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(unsigned long) (desc->bufPtr));
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}
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}
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dagList->numDagsDone++;
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rf_ContinueRaidAccess(desc);
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}
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int
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rf_State_LastState(RF_RaidAccessDesc_t * desc)
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{
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void (*callbackFunc) (RF_CBParam_t) = desc->callbackFunc;
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RF_CBParam_t callbackArg;
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callbackArg.p = desc->callbackArg;
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/*
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* If this is not an async request, wake up the caller
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*/
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if (desc->async_flag == 0)
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wakeup(desc->bp);
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/*
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* That's all the IO for this one... unbusy the 'disk'.
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*/
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rf_disk_unbusy(desc);
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/*
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* Wakeup any requests waiting to go.
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*/
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RF_LOCK_MUTEX(((RF_Raid_t *) desc->raidPtr)->mutex);
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((RF_Raid_t *) desc->raidPtr)->openings++;
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RF_UNLOCK_MUTEX(((RF_Raid_t *) desc->raidPtr)->mutex);
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/* wake up any pending IO */
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raidstart(((RF_Raid_t *) desc->raidPtr));
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/* printf("Calling biodone on 0x%x\n",desc->bp); */
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biodone(desc->bp); /* access came through ioctl */
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if (callbackFunc)
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callbackFunc(callbackArg);
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rf_FreeRaidAccDesc(desc);
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return RF_FALSE;
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}
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int
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rf_State_IncrAccessCount(RF_RaidAccessDesc_t * desc)
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{
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RF_Raid_t *raidPtr;
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raidPtr = desc->raidPtr;
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/* Bummer. We have to do this to be 100% safe w.r.t. the increment
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* below */
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RF_LOCK_MUTEX(raidPtr->access_suspend_mutex);
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raidPtr->accs_in_flight++; /* used to detect quiescence */
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RF_UNLOCK_MUTEX(raidPtr->access_suspend_mutex);
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desc->state++;
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return RF_FALSE;
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}
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int
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rf_State_DecrAccessCount(RF_RaidAccessDesc_t * desc)
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{
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RF_Raid_t *raidPtr;
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raidPtr = desc->raidPtr;
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RF_LOCK_MUTEX(raidPtr->access_suspend_mutex);
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raidPtr->accs_in_flight--;
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if (raidPtr->accesses_suspended && raidPtr->accs_in_flight == 0) {
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rf_SignalQuiescenceLock(raidPtr, raidPtr->reconDesc);
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}
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rf_UpdateUserStats(raidPtr, RF_ETIMER_VAL_US(desc->timer), desc->numBlocks);
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RF_UNLOCK_MUTEX(raidPtr->access_suspend_mutex);
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desc->state++;
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return RF_FALSE;
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}
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int
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rf_State_Quiesce(RF_RaidAccessDesc_t * desc)
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{
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RF_AccTraceEntry_t *tracerec = &desc->tracerec;
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RF_Etimer_t timer;
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int suspended = RF_FALSE;
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RF_Raid_t *raidPtr;
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raidPtr = desc->raidPtr;
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RF_ETIMER_START(timer);
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RF_ETIMER_START(desc->timer);
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RF_LOCK_MUTEX(raidPtr->access_suspend_mutex);
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if (raidPtr->accesses_suspended) {
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RF_CallbackDesc_t *cb;
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cb = rf_AllocCallbackDesc();
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/* XXX the following cast is quite bogus...
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* rf_ContinueRaidAccess takes a (RF_RaidAccessDesc_t *) as an
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* argument.. GO */
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cb->callbackFunc = (void (*) (RF_CBParam_t)) rf_ContinueRaidAccess;
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cb->callbackArg.p = (void *) desc;
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cb->next = raidPtr->quiesce_wait_list;
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raidPtr->quiesce_wait_list = cb;
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suspended = RF_TRUE;
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}
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RF_UNLOCK_MUTEX(raidPtr->access_suspend_mutex);
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RF_ETIMER_STOP(timer);
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RF_ETIMER_EVAL(timer);
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tracerec->specific.user.suspend_ovhd_us += RF_ETIMER_VAL_US(timer);
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if (suspended && rf_quiesceDebug)
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printf("Stalling access due to quiescence lock\n");
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desc->state++;
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return suspended;
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}
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int
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rf_State_Map(RF_RaidAccessDesc_t * desc)
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{
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RF_Raid_t *raidPtr = desc->raidPtr;
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RF_AccTraceEntry_t *tracerec = &desc->tracerec;
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RF_Etimer_t timer;
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RF_ETIMER_START(timer);
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if (!(desc->asmap = rf_MapAccess(raidPtr, desc->raidAddress, desc->numBlocks,
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desc->bufPtr, RF_DONT_REMAP)))
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RF_PANIC();
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RF_ETIMER_STOP(timer);
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RF_ETIMER_EVAL(timer);
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tracerec->specific.user.map_us = RF_ETIMER_VAL_US(timer);
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desc->state++;
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return RF_FALSE;
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}
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int
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rf_State_Lock(RF_RaidAccessDesc_t * desc)
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{
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RF_AccTraceEntry_t *tracerec = &desc->tracerec;
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RF_Raid_t *raidPtr = desc->raidPtr;
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RF_AccessStripeMapHeader_t *asmh = desc->asmap;
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RF_AccessStripeMap_t *asm_p;
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RF_Etimer_t timer;
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int suspended = RF_FALSE;
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RF_ETIMER_START(timer);
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if (!(raidPtr->Layout.map->flags & RF_NO_STRIPE_LOCKS)) {
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RF_StripeNum_t lastStripeID = -1;
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/* acquire each lock that we don't already hold */
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for (asm_p = asmh->stripeMap; asm_p; asm_p = asm_p->next) {
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RF_ASSERT(RF_IO_IS_R_OR_W(desc->type));
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if (!rf_suppressLocksAndLargeWrites &&
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asm_p->parityInfo &&
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!(desc->flags & RF_DAG_SUPPRESS_LOCKS) &&
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!(asm_p->flags & RF_ASM_FLAGS_LOCK_TRIED)) {
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asm_p->flags |= RF_ASM_FLAGS_LOCK_TRIED;
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RF_ASSERT(asm_p->stripeID > lastStripeID);
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/* locks must be acquired hierarchically */
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lastStripeID = asm_p->stripeID;
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/* XXX the cast to (void (*)(RF_CBParam_t))
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* below is bogus! GO */
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RF_INIT_LOCK_REQ_DESC(asm_p->lockReqDesc,
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desc->type,
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(void (*) (RF_Buf_t)) rf_ContinueRaidAccess,
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desc, asm_p,
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raidPtr->Layout.dataSectorsPerStripe);
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if (rf_AcquireStripeLock(raidPtr->lockTable,
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asm_p->stripeID, &asm_p->lockReqDesc)) {
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suspended = RF_TRUE;
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break;
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}
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}
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if (desc->type == RF_IO_TYPE_WRITE &&
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raidPtr->status[asm_p->physInfo->row] == rf_rs_reconstructing) {
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if (!(asm_p->flags & RF_ASM_FLAGS_FORCE_TRIED)) {
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int val;
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asm_p->flags |= RF_ASM_FLAGS_FORCE_TRIED;
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/* XXX the cast below is quite
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* bogus!!! XXX GO */
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val = rf_ForceOrBlockRecon(raidPtr, asm_p,
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(void (*) (RF_Raid_t *, void *)) rf_ContinueRaidAccess, desc);
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if (val == 0) {
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asm_p->flags |= RF_ASM_FLAGS_RECON_BLOCKED;
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} else {
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suspended = RF_TRUE;
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break;
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}
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} else {
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if (rf_pssDebug) {
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printf("raid%d: skipping force/block because already done, psid %ld\n",
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desc->raidPtr->raidid,
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(long) asm_p->stripeID);
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}
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}
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} else {
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if (rf_pssDebug) {
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printf("raid%d: skipping force/block because not write or not under recon, psid %ld\n",
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desc->raidPtr->raidid,
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(long) asm_p->stripeID);
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}
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}
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}
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RF_ETIMER_STOP(timer);
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RF_ETIMER_EVAL(timer);
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tracerec->specific.user.lock_us += RF_ETIMER_VAL_US(timer);
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if (suspended)
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return (RF_TRUE);
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}
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desc->state++;
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return (RF_FALSE);
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}
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/*
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* the following three states create, execute, and post-process dags
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* the error recovery unit is a single dag.
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* by default, SelectAlgorithm creates an array of dags, one per parity stripe
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* in some tricky cases, multiple dags per stripe are created
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* - dags within a parity stripe are executed sequentially (arbitrary order)
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* - dags for distinct parity stripes are executed concurrently
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*
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* repeat until all dags complete successfully -or- dag selection fails
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*
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* while !done
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* create dag(s) (SelectAlgorithm)
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* if dag
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* execute dag (DispatchDAG)
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* if dag successful
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* done (SUCCESS)
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* else
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* !done (RETRY - start over with new dags)
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* else
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* done (FAIL)
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*/
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int
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rf_State_CreateDAG(RF_RaidAccessDesc_t * desc)
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{
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RF_AccTraceEntry_t *tracerec = &desc->tracerec;
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RF_Etimer_t timer;
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RF_DagHeader_t *dag_h;
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int i, selectStatus;
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/* generate a dag for the access, and fire it off. When the dag
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* completes, we'll get re-invoked in the next state. */
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RF_ETIMER_START(timer);
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/* SelectAlgorithm returns one or more dags */
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selectStatus = rf_SelectAlgorithm(desc, desc->flags | RF_DAG_SUPPRESS_LOCKS);
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if (rf_printDAGsDebug)
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for (i = 0; i < desc->numStripes; i++)
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rf_PrintDAGList(desc->dagArray[i].dags);
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RF_ETIMER_STOP(timer);
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RF_ETIMER_EVAL(timer);
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/* update time to create all dags */
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tracerec->specific.user.dag_create_us = RF_ETIMER_VAL_US(timer);
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desc->status = 0; /* good status */
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if (selectStatus) {
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/* failed to create a dag */
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/* this happens when there are too many faults or incomplete
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* dag libraries */
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printf("[Failed to create a DAG]\n");
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RF_PANIC();
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} else {
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/* bind dags to desc */
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for (i = 0; i < desc->numStripes; i++) {
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dag_h = desc->dagArray[i].dags;
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while (dag_h) {
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dag_h->bp = (RF_Buf_t) desc->bp;
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dag_h->tracerec = tracerec;
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dag_h = dag_h->next;
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}
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}
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desc->flags |= RF_DAG_DISPATCH_RETURNED;
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desc->state++; /* next state should be rf_State_ExecuteDAG */
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}
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return RF_FALSE;
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}
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/* the access has an array of dagLists, one dagList per parity stripe.
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* fire the first dag in each parity stripe (dagList).
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* dags within a stripe (dagList) must be executed sequentially
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* - this preserves atomic parity update
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* dags for independents parity groups (stripes) are fired concurrently */
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int
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rf_State_ExecuteDAG(RF_RaidAccessDesc_t * desc)
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{
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int i;
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RF_DagHeader_t *dag_h;
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RF_DagList_t *dagArray = desc->dagArray;
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/* next state is always rf_State_ProcessDAG important to do this
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* before firing the first dag (it may finish before we leave this
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* routine) */
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desc->state++;
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/* sweep dag array, a stripe at a time, firing the first dag in each
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* stripe */
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for (i = 0; i < desc->numStripes; i++) {
|
|
RF_ASSERT(dagArray[i].numDags > 0);
|
|
RF_ASSERT(dagArray[i].numDagsDone == 0);
|
|
RF_ASSERT(dagArray[i].numDagsFired == 0);
|
|
RF_ETIMER_START(dagArray[i].tracerec.timer);
|
|
/* fire first dag in this stripe */
|
|
dag_h = dagArray[i].dags;
|
|
RF_ASSERT(dag_h);
|
|
dagArray[i].numDagsFired++;
|
|
/* XXX Yet another case where we pass in a conflicting
|
|
* function pointer :-( XXX GO */
|
|
rf_DispatchDAG(dag_h, (void (*) (void *)) rf_ContinueDagAccess, &dagArray[i]);
|
|
}
|
|
|
|
/* the DAG will always call the callback, even if there was no
|
|
* blocking, so we are always suspended in this state */
|
|
return RF_TRUE;
|
|
}
|
|
|
|
|
|
|
|
/* rf_State_ProcessDAG is entered when a dag completes.
|
|
* first, check to all dags in the access have completed
|
|
* if not, fire as many dags as possible */
|
|
|
|
int
|
|
rf_State_ProcessDAG(RF_RaidAccessDesc_t * desc)
|
|
{
|
|
RF_AccessStripeMapHeader_t *asmh = desc->asmap;
|
|
RF_Raid_t *raidPtr = desc->raidPtr;
|
|
RF_DagHeader_t *dag_h;
|
|
int i, j, done = RF_TRUE;
|
|
RF_DagList_t *dagArray = desc->dagArray;
|
|
RF_Etimer_t timer;
|
|
|
|
/* check to see if this is the last dag */
|
|
for (i = 0; i < desc->numStripes; i++)
|
|
if (dagArray[i].numDags != dagArray[i].numDagsDone)
|
|
done = RF_FALSE;
|
|
|
|
if (done) {
|
|
if (desc->status) {
|
|
/* a dag failed, retry */
|
|
RF_ETIMER_START(timer);
|
|
/* free all dags */
|
|
for (i = 0; i < desc->numStripes; i++) {
|
|
rf_FreeDAG(desc->dagArray[i].dags);
|
|
}
|
|
rf_MarkFailuresInASMList(raidPtr, asmh);
|
|
/* back up to rf_State_CreateDAG */
|
|
desc->state = desc->state - 2;
|
|
return RF_FALSE;
|
|
} else {
|
|
/* move on to rf_State_Cleanup */
|
|
desc->state++;
|
|
}
|
|
return RF_FALSE;
|
|
} else {
|
|
/* more dags to execute */
|
|
/* see if any are ready to be fired. if so, fire them */
|
|
/* don't fire the initial dag in a list, it's fired in
|
|
* rf_State_ExecuteDAG */
|
|
for (i = 0; i < desc->numStripes; i++) {
|
|
if ((dagArray[i].numDagsDone < dagArray[i].numDags)
|
|
&& (dagArray[i].numDagsDone == dagArray[i].numDagsFired)
|
|
&& (dagArray[i].numDagsFired > 0)) {
|
|
RF_ETIMER_START(dagArray[i].tracerec.timer);
|
|
/* fire next dag in this stripe */
|
|
/* first, skip to next dag awaiting execution */
|
|
dag_h = dagArray[i].dags;
|
|
for (j = 0; j < dagArray[i].numDagsDone; j++)
|
|
dag_h = dag_h->next;
|
|
dagArray[i].numDagsFired++;
|
|
/* XXX and again we pass a different function
|
|
* pointer.. GO */
|
|
rf_DispatchDAG(dag_h, (void (*) (void *)) rf_ContinueDagAccess,
|
|
&dagArray[i]);
|
|
}
|
|
}
|
|
return RF_TRUE;
|
|
}
|
|
}
|
|
/* only make it this far if all dags complete successfully */
|
|
int
|
|
rf_State_Cleanup(RF_RaidAccessDesc_t * desc)
|
|
{
|
|
RF_AccTraceEntry_t *tracerec = &desc->tracerec;
|
|
RF_AccessStripeMapHeader_t *asmh = desc->asmap;
|
|
RF_Raid_t *raidPtr = desc->raidPtr;
|
|
RF_AccessStripeMap_t *asm_p;
|
|
RF_DagHeader_t *dag_h;
|
|
RF_Etimer_t timer;
|
|
int i;
|
|
|
|
desc->state++;
|
|
|
|
timer = tracerec->timer;
|
|
RF_ETIMER_STOP(timer);
|
|
RF_ETIMER_EVAL(timer);
|
|
tracerec->specific.user.dag_retry_us = RF_ETIMER_VAL_US(timer);
|
|
|
|
/* the RAID I/O is complete. Clean up. */
|
|
tracerec->specific.user.dag_retry_us = 0;
|
|
|
|
RF_ETIMER_START(timer);
|
|
if (desc->flags & RF_DAG_RETURN_DAG) {
|
|
/* copy dags into paramDAG */
|
|
*(desc->paramDAG) = desc->dagArray[0].dags;
|
|
dag_h = *(desc->paramDAG);
|
|
for (i = 1; i < desc->numStripes; i++) {
|
|
/* concatenate dags from remaining stripes */
|
|
RF_ASSERT(dag_h);
|
|
while (dag_h->next)
|
|
dag_h = dag_h->next;
|
|
dag_h->next = desc->dagArray[i].dags;
|
|
}
|
|
} else {
|
|
/* free all dags */
|
|
for (i = 0; i < desc->numStripes; i++) {
|
|
rf_FreeDAG(desc->dagArray[i].dags);
|
|
}
|
|
}
|
|
|
|
RF_ETIMER_STOP(timer);
|
|
RF_ETIMER_EVAL(timer);
|
|
tracerec->specific.user.cleanup_us = RF_ETIMER_VAL_US(timer);
|
|
|
|
RF_ETIMER_START(timer);
|
|
if (!(raidPtr->Layout.map->flags & RF_NO_STRIPE_LOCKS)) {
|
|
for (asm_p = asmh->stripeMap; asm_p; asm_p = asm_p->next) {
|
|
if (!rf_suppressLocksAndLargeWrites &&
|
|
asm_p->parityInfo &&
|
|
!(desc->flags & RF_DAG_SUPPRESS_LOCKS)) {
|
|
RF_ASSERT_VALID_LOCKREQ(&asm_p->lockReqDesc);
|
|
rf_ReleaseStripeLock(raidPtr->lockTable,
|
|
asm_p->stripeID,
|
|
&asm_p->lockReqDesc);
|
|
}
|
|
if (asm_p->flags & RF_ASM_FLAGS_RECON_BLOCKED) {
|
|
rf_UnblockRecon(raidPtr, asm_p);
|
|
}
|
|
}
|
|
}
|
|
RF_ETIMER_STOP(timer);
|
|
RF_ETIMER_EVAL(timer);
|
|
tracerec->specific.user.lock_us += RF_ETIMER_VAL_US(timer);
|
|
|
|
RF_ETIMER_START(timer);
|
|
if (desc->flags & RF_DAG_RETURN_ASM)
|
|
*(desc->paramASM) = asmh;
|
|
else
|
|
rf_FreeAccessStripeMap(asmh);
|
|
RF_ETIMER_STOP(timer);
|
|
RF_ETIMER_EVAL(timer);
|
|
tracerec->specific.user.cleanup_us += RF_ETIMER_VAL_US(timer);
|
|
|
|
RF_ETIMER_STOP(desc->timer);
|
|
RF_ETIMER_EVAL(desc->timer);
|
|
|
|
timer = desc->tracerec.tot_timer;
|
|
RF_ETIMER_STOP(timer);
|
|
RF_ETIMER_EVAL(timer);
|
|
desc->tracerec.total_us = RF_ETIMER_VAL_US(timer);
|
|
|
|
rf_LogTraceRec(raidPtr, tracerec);
|
|
|
|
desc->flags |= RF_DAG_ACCESS_COMPLETE;
|
|
|
|
return RF_FALSE;
|
|
}
|