236 lines
8.7 KiB
C
236 lines
8.7 KiB
C
/* $NetBSD: rf_dag.h,v 1.3 1999/02/05 00:06:07 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: William V. Courtright II, 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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* dag.h -- header file for DAG-related data structures *
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* *
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****************************************************************************/
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#ifndef _RF__RF_DAG_H_
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#define _RF__RF_DAG_H_
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#include "rf_types.h"
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#include "rf_threadstuff.h"
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#include "rf_alloclist.h"
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#include "rf_stripelocks.h"
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#include "rf_layout.h"
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#include "rf_dagflags.h"
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#include "rf_acctrace.h"
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#include "rf_memchunk.h"
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#define RF_THREAD_CONTEXT 0 /* we were invoked from thread context */
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#define RF_INTR_CONTEXT 1 /* we were invoked from interrupt context */
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#define RF_MAX_ANTECEDENTS 20 /* max num of antecedents a node may posses */
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#include <sys/buf.h>
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struct RF_PropHeader_s { /* structure for propagation of results */
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int resultNum; /* bind result # resultNum */
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int paramNum; /* to parameter # paramNum */
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RF_PropHeader_t *next; /* linked list for multiple results/params */
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};
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typedef enum RF_NodeStatus_e {
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rf_bwd1, /* node is ready for undo logging (backward
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* error recovery only) */
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rf_bwd2, /* node has completed undo logging (backward
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* error recovery only) */
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rf_wait, /* node is waiting to be executed */
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rf_fired, /* node is currently executing its do function */
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rf_good, /* node successfully completed execution of
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* its do function */
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rf_bad, /* node failed to successfully execute its do
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* function */
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rf_skipped, /* not used anymore, used to imply a node was
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* not executed */
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rf_recover, /* node is currently executing its undo
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* function */
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rf_panic, /* node failed to successfully execute its
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* undo function */
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rf_undone /* node successfully executed its undo
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* function */
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} RF_NodeStatus_t;
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/*
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* These were used to control skipping a node.
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* Now, these are only used as comments.
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*/
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typedef enum RF_AntecedentType_e {
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rf_trueData,
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rf_antiData,
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rf_outputData,
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rf_control
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} RF_AntecedentType_t;
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#define RF_DAG_PTRCACHESIZE 40
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#define RF_DAG_PARAMCACHESIZE 12
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typedef RF_uint8 RF_DagNodeFlags_t;
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struct RF_DagNode_s {
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RF_NodeStatus_t status; /* current status of this node */
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int (*doFunc) (RF_DagNode_t *); /* normal function */
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int (*undoFunc) (RF_DagNode_t *); /* func to remove effect of
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* doFunc */
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int (*wakeFunc) (RF_DagNode_t *, int status); /* func called when the
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* node completes an I/O */
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int numParams; /* number of parameters required by *funcPtr */
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int numResults; /* number of results produced by *funcPtr */
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int numAntecedents; /* number of antecedents */
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int numAntDone; /* number of antecedents which have finished */
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int numSuccedents; /* number of succedents */
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int numSuccFired; /* incremented when a succedent is fired
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* during forward execution */
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int numSuccDone; /* incremented when a succedent finishes
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* during rollBackward */
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int commitNode; /* boolean flag - if true, this is a commit
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* node */
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RF_DagNode_t **succedents; /* succedents, array size
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* numSuccedents */
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RF_DagNode_t **antecedents; /* antecedents, array size
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* numAntecedents */
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RF_AntecedentType_t antType[RF_MAX_ANTECEDENTS]; /* type of each
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* antecedent */
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void **results; /* array of results produced by *funcPtr */
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RF_DagParam_t *params; /* array of parameters required by *funcPtr */
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RF_PropHeader_t **propList; /* propagation list, size
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* numSuccedents */
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RF_DagHeader_t *dagHdr; /* ptr to head of dag containing this node */
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void *dagFuncData; /* dag execution func uses this for whatever
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* it wants */
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RF_DagNode_t *next;
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int nodeNum; /* used by PrintDAG for debug only */
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int visited; /* used to avoid re-visiting nodes on DAG
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* walks */
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/* ANY CODE THAT USES THIS FIELD MUST MAINTAIN THE PROPERTY THAT AFTER
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* IT FINISHES, ALL VISITED FLAGS IN THE DAG ARE IDENTICAL */
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char *name; /* debug only */
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RF_DagNodeFlags_t flags;/* see below */
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RF_DagNode_t *dag_ptrs[RF_DAG_PTRCACHESIZE]; /* cache for performance */
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RF_DagParam_t dag_params[RF_DAG_PARAMCACHESIZE]; /* cache for performance */
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};
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/*
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* Bit values for flags field of RF_DagNode_t
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*/
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#define RF_DAGNODE_FLAG_NONE 0x00
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#define RF_DAGNODE_FLAG_YIELD 0x01 /* in the kernel, yield the processor
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* before firing this node */
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/* enable - DAG ready for normal execution, no errors encountered
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* rollForward - DAG encountered an error after commit point, rolling forward
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* rollBackward - DAG encountered an error prior to commit point, rolling backward
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*/
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typedef enum RF_DagStatus_e {
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rf_enable,
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rf_rollForward,
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rf_rollBackward
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} RF_DagStatus_t;
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#define RF_MAX_HDR_SUCC 1
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#define RF_MAXCHUNKS 10
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struct RF_DagHeader_s {
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RF_DagStatus_t status; /* status of this DAG */
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int numSuccedents; /* DAG may be a tree, i.e. may have > 1 root */
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int numCommitNodes; /* number of commit nodes in graph */
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int numCommits; /* number of commit nodes which have been
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* fired */
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RF_DagNode_t *succedents[RF_MAX_HDR_SUCC]; /* array of succedents,
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* size numSuccedents */
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RF_DagHeader_t *next; /* ptr to allow a list of dags */
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RF_AllocListElem_t *allocList; /* ptr to list of ptrs to be freed
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* prior to freeing DAG */
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RF_AccessStripeMapHeader_t *asmList; /* list of access stripe maps
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* to be freed */
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int nodeNum; /* used by PrintDAG for debug only */
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int numNodesCompleted;
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RF_AccTraceEntry_t *tracerec; /* perf mon only */
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void (*cbFunc) (void *); /* function to call when the dag
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* completes */
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void *cbArg; /* argument for cbFunc */
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char *creator; /* name of function used to create this dag */
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RF_Raid_t *raidPtr; /* the descriptor for the RAID device this DAG
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* is for */
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void *bp; /* the bp for this I/O passed down from the
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* file system. ignored outside kernel */
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RF_ChunkDesc_t *memChunk[RF_MAXCHUNKS]; /* experimental- Chunks of
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* memory to be retained upon
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* DAG free for re-use */
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int chunkIndex; /* the idea is to avoid calls to alloc and
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* free */
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RF_ChunkDesc_t **xtraMemChunk; /* escape hatch which allows
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* SelectAlgorithm to merge memChunks
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* from several dags */
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int xtraChunkIndex; /* number of ptrs to valid chunks */
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int xtraChunkCnt; /* number of ptrs to chunks allocated */
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};
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struct RF_DagList_s {
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/* common info for a list of dags which will be fired sequentially */
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int numDags; /* number of dags in the list */
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int numDagsFired; /* number of dags in list which have initiated
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* execution */
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int numDagsDone; /* number of dags in list which have completed
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* execution */
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RF_DagHeader_t *dags; /* list of dags */
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RF_RaidAccessDesc_t *desc; /* ptr to descriptor for this access */
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RF_AccTraceEntry_t tracerec; /* perf mon info for dags (not user
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* info) */
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};
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/* resets a node so that it can be fired again */
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#define RF_ResetNode(_n_) { \
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(_n_)->status = rf_wait; \
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(_n_)->numAntDone = 0; \
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(_n_)->numSuccFired = 0; \
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(_n_)->numSuccDone = 0; \
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(_n_)->next = NULL; \
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}
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#define RF_ResetDagHeader(_h_) { \
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(_h_)->numNodesCompleted = 0; \
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(_h_)->numCommits = 0; \
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(_h_)->status = rf_enable; \
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}
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/* convience macro for declaring a create dag function */
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#define RF_CREATE_DAG_FUNC_DECL(_name_) \
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void _name_ ( \
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RF_Raid_t *raidPtr, \
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RF_AccessStripeMap_t *asmap, \
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RF_DagHeader_t *dag_h, \
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void *bp, \
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RF_RaidAccessFlags_t flags, \
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RF_AllocListElem_t *allocList)
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#endif /* !_RF__RF_DAG_H_ */
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