rf_dag.h revision 1.11
1 /* $NetBSD: rf_dag.h,v 1.11 2004/03/04 00:56:13 oster Exp $ */ 2 /* 3 * Copyright (c) 1995 Carnegie-Mellon University. 4 * All rights reserved. 5 * 6 * Author: William V. Courtright II, Mark Holland 7 * 8 * Permission to use, copy, modify and distribute this software and 9 * its documentation is hereby granted, provided that both the copyright 10 * notice and this permission notice appear in all copies of the 11 * software, derivative works or modified versions, and any portions 12 * thereof, and that both notices appear in supporting documentation. 13 * 14 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" 15 * CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND 16 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE. 17 * 18 * Carnegie Mellon requests users of this software to return to 19 * 20 * Software Distribution Coordinator or Software.Distribution (at) CS.CMU.EDU 21 * School of Computer Science 22 * Carnegie Mellon University 23 * Pittsburgh PA 15213-3890 24 * 25 * any improvements or extensions that they make and grant Carnegie the 26 * rights to redistribute these changes. 27 */ 28 29 /**************************************************************************** 30 * * 31 * dag.h -- header file for DAG-related data structures * 32 * * 33 ****************************************************************************/ 34 35 #ifndef _RF__RF_DAG_H_ 36 #define _RF__RF_DAG_H_ 37 38 #include <dev/raidframe/raidframevar.h> 39 40 #include "rf_threadstuff.h" 41 #include "rf_alloclist.h" 42 #include "rf_stripelocks.h" 43 #include "rf_layout.h" 44 #include "rf_dagflags.h" 45 #include "rf_acctrace.h" 46 47 #define RF_THREAD_CONTEXT 0 /* we were invoked from thread context */ 48 #define RF_INTR_CONTEXT 1 /* we were invoked from interrupt context */ 49 #define RF_MAX_ANTECEDENTS 20 /* max num of antecedents a node may posses */ 50 51 #include <sys/buf.h> 52 53 struct RF_PropHeader_s { /* structure for propagation of results */ 54 int paramNum; /* to parameter # paramNum */ 55 RF_PropHeader_t *next; /* linked list for multiple results/params */ 56 }; 57 58 typedef enum RF_NodeStatus_e { 59 rf_wait, /* node is waiting to be executed */ 60 rf_fired, /* node is currently executing its do function */ 61 rf_good, /* node successfully completed execution of 62 * its do function */ 63 rf_bad, /* node failed to successfully execute its do 64 * function */ 65 rf_skipped, /* not used anymore, used to imply a node was 66 * not executed */ 67 rf_recover, /* node is currently executing its undo 68 * function */ 69 rf_panic, /* node failed to successfully execute its 70 * undo function */ 71 rf_undone /* node successfully executed its undo 72 * function */ 73 } RF_NodeStatus_t; 74 /* 75 * These were used to control skipping a node. 76 * Now, these are only used as comments. 77 */ 78 typedef enum RF_AntecedentType_e { 79 rf_trueData, 80 rf_antiData, 81 rf_outputData, 82 rf_control 83 } RF_AntecedentType_t; 84 #define RF_DAG_PTRCACHESIZE 40 85 #define RF_DAG_PARAMCACHESIZE 12 86 87 typedef RF_uint8 RF_DagNodeFlags_t; 88 89 struct RF_DagNode_s { 90 RF_NodeStatus_t status; /* current status of this node */ 91 int (*doFunc) (RF_DagNode_t *); /* normal function */ 92 int (*undoFunc) (RF_DagNode_t *); /* func to remove effect of 93 * doFunc */ 94 int (*wakeFunc) (RF_DagNode_t *, int status); /* func called when the 95 * node completes an I/O */ 96 int numParams; /* number of parameters required by *funcPtr */ 97 int numResults; /* number of results produced by *funcPtr */ 98 int numAntecedents; /* number of antecedents */ 99 int numAntDone; /* number of antecedents which have finished */ 100 int numSuccedents; /* number of succedents */ 101 int numSuccFired; /* incremented when a succedent is fired 102 * during forward execution */ 103 int numSuccDone; /* incremented when a succedent finishes 104 * during rollBackward */ 105 int commitNode; /* boolean flag - if true, this is a commit 106 * node */ 107 RF_DagNode_t **succedents; /* succedents, array size 108 * numSuccedents */ 109 RF_DagNode_t **antecedents; /* antecedents, array size 110 * numAntecedents */ 111 RF_AntecedentType_t antType[RF_MAX_ANTECEDENTS]; /* type of each 112 * antecedent */ 113 void **results; /* array of results produced by *funcPtr */ 114 RF_DagParam_t *params; /* array of parameters required by *funcPtr */ 115 RF_PropHeader_t **propList; /* propagation list, size 116 * numSuccedents */ 117 RF_DagHeader_t *dagHdr; /* ptr to head of dag containing this node */ 118 void *dagFuncData; /* dag execution func uses this for whatever 119 * it wants */ 120 RF_DagNode_t *next; 121 int nodeNum; /* used by PrintDAG for debug only */ 122 int visited; /* used to avoid re-visiting nodes on DAG 123 * walks */ 124 /* ANY CODE THAT USES THIS FIELD MUST MAINTAIN THE PROPERTY THAT AFTER 125 * IT FINISHES, ALL VISITED FLAGS IN THE DAG ARE IDENTICAL */ 126 char *name; /* debug only */ 127 RF_DagNodeFlags_t flags;/* see below */ 128 RF_DagNode_t *dag_ptrs[RF_DAG_PTRCACHESIZE]; /* cache for performance */ 129 RF_DagParam_t dag_params[RF_DAG_PARAMCACHESIZE]; /* cache for performance */ 130 }; 131 /* 132 * Bit values for flags field of RF_DagNode_t 133 */ 134 #define RF_DAGNODE_FLAG_NONE 0x00 135 #define RF_DAGNODE_FLAG_YIELD 0x01 /* in the kernel, yield the processor 136 * before firing this node */ 137 138 /* enable - DAG ready for normal execution, no errors encountered 139 * rollForward - DAG encountered an error after commit point, rolling forward 140 * rollBackward - DAG encountered an error prior to commit point, rolling backward 141 */ 142 typedef enum RF_DagStatus_e { 143 rf_enable, 144 rf_rollForward, 145 rf_rollBackward 146 } RF_DagStatus_t; 147 #define RF_MAX_HDR_SUCC 1 148 149 struct RF_DagHeader_s { 150 RF_DagStatus_t status; /* status of this DAG */ 151 int numSuccedents; /* DAG may be a tree, i.e. may have > 1 root */ 152 int numCommitNodes; /* number of commit nodes in graph */ 153 int numCommits; /* number of commit nodes which have been 154 * fired */ 155 RF_DagNode_t *succedents[RF_MAX_HDR_SUCC]; /* array of succedents, 156 * size numSuccedents */ 157 RF_DagHeader_t *next; /* ptr to allow a list of dags */ 158 RF_AllocListElem_t *allocList; /* ptr to list of ptrs to be freed 159 * prior to freeing DAG */ 160 RF_AccessStripeMapHeader_t *asmList; /* list of access stripe maps 161 * to be freed */ 162 int nodeNum; /* used by PrintDAG for debug only */ 163 int numNodesCompleted; 164 #if RF_ACC_TRACE > 0 165 RF_AccTraceEntry_t *tracerec; /* perf mon only */ 166 #endif 167 void (*cbFunc) (void *); /* function to call when the dag 168 * completes */ 169 void *cbArg; /* argument for cbFunc */ 170 char *creator; /* name of function used to create this dag */ 171 172 RF_Raid_t *raidPtr; /* the descriptor for the RAID device this DAG 173 * is for */ 174 void *bp; /* the bp for this I/O passed down from the 175 * file system. ignored outside kernel */ 176 }; 177 178 struct RF_DagList_s { 179 /* common info for a list of dags which will be fired sequentially */ 180 int numDags; /* number of dags in the list */ 181 int numDagsFired; /* number of dags in list which have initiated 182 * execution */ 183 int numDagsDone; /* number of dags in list which have completed 184 * execution */ 185 RF_DagHeader_t *dags; /* list of dags */ 186 RF_RaidAccessDesc_t *desc; /* ptr to descriptor for this access */ 187 RF_AccTraceEntry_t tracerec; /* perf mon info for dags (not user 188 * info) */ 189 struct RF_DagList_s *next; /* next DagList, if any */ 190 }; 191 192 /* convience macro for declaring a create dag function */ 193 194 #define RF_CREATE_DAG_FUNC_DECL(_name_) \ 195 void _name_ ( \ 196 RF_Raid_t *raidPtr, \ 197 RF_AccessStripeMap_t *asmap, \ 198 RF_DagHeader_t *dag_h, \ 199 void *bp, \ 200 RF_RaidAccessFlags_t flags, \ 201 RF_AllocListElem_t *allocList) 202 203 #endif /* !_RF__RF_DAG_H_ */ 204
Indexes created Tue Oct 14 15:09:51 GMT 2025