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346 lines
11 KiB
C
346 lines
11 KiB
C
/*-------------------------------------------------------------------------
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*
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* rel.h
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* POSTGRES relation descriptor (a/k/a relcache entry) definitions.
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*
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*
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* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $PostgreSQL: pgsql/src/include/utils/rel.h,v 1.109 2008/11/26 17:08:58 heikki Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef REL_H
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#define REL_H
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#include "access/tupdesc.h"
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#include "catalog/pg_am.h"
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#include "catalog/pg_class.h"
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#include "catalog/pg_index.h"
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#include "fmgr.h"
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#include "nodes/bitmapset.h"
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#include "rewrite/prs2lock.h"
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#include "storage/block.h"
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#include "storage/relfilenode.h"
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#include "utils/relcache.h"
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/*
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* LockRelId and LockInfo really belong to lmgr.h, but it's more convenient
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* to declare them here so we can have a LockInfoData field in a Relation.
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*/
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typedef struct LockRelId
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{
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Oid relId; /* a relation identifier */
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Oid dbId; /* a database identifier */
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} LockRelId;
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typedef struct LockInfoData
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{
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LockRelId lockRelId;
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} LockInfoData;
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typedef LockInfoData *LockInfo;
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/*
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* Likewise, this struct really belongs to trigger.h, but for convenience
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* we put it here.
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*/
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typedef struct Trigger
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{
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Oid tgoid; /* OID of trigger (pg_trigger row) */
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/* Remaining fields are copied from pg_trigger, see pg_trigger.h */
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char *tgname;
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Oid tgfoid;
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int16 tgtype;
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char tgenabled;
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bool tgisconstraint;
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Oid tgconstrrelid;
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Oid tgconstraint;
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bool tgdeferrable;
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bool tginitdeferred;
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int16 tgnargs;
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int16 tgnattr;
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int16 *tgattr;
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char **tgargs;
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} Trigger;
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typedef struct TriggerDesc
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{
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/*
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* Index data to identify which triggers are which. Since each trigger
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* can appear in more than one class, for each class we provide a list of
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* integer indexes into the triggers array. The class codes are defined
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* by TRIGGER_EVENT_xxx macros in commands/trigger.h.
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*/
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#define TRIGGER_NUM_EVENT_CLASSES 4
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uint16 n_before_statement[TRIGGER_NUM_EVENT_CLASSES];
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uint16 n_before_row[TRIGGER_NUM_EVENT_CLASSES];
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uint16 n_after_row[TRIGGER_NUM_EVENT_CLASSES];
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uint16 n_after_statement[TRIGGER_NUM_EVENT_CLASSES];
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int *tg_before_statement[TRIGGER_NUM_EVENT_CLASSES];
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int *tg_before_row[TRIGGER_NUM_EVENT_CLASSES];
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int *tg_after_row[TRIGGER_NUM_EVENT_CLASSES];
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int *tg_after_statement[TRIGGER_NUM_EVENT_CLASSES];
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/* The actual array of triggers is here */
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Trigger *triggers;
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int numtriggers;
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} TriggerDesc;
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/*
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* Cached lookup information for the index access method functions defined
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* by the pg_am row associated with an index relation.
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*/
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typedef struct RelationAmInfo
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{
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FmgrInfo aminsert;
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FmgrInfo ambeginscan;
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FmgrInfo amgettuple;
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FmgrInfo amgetbitmap;
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FmgrInfo amrescan;
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FmgrInfo amendscan;
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FmgrInfo ammarkpos;
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FmgrInfo amrestrpos;
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FmgrInfo ambuild;
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FmgrInfo ambulkdelete;
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FmgrInfo amvacuumcleanup;
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FmgrInfo amcostestimate;
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FmgrInfo amoptions;
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} RelationAmInfo;
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/*
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* Here are the contents of a relation cache entry.
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*/
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typedef struct RelationData
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{
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RelFileNode rd_node; /* relation physical identifier */
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/* use "struct" here to avoid needing to include smgr.h: */
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struct SMgrRelationData *rd_smgr; /* cached file handle, or NULL */
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BlockNumber rd_targblock; /* current insertion target block, or
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* InvalidBlockNumber */
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int rd_refcnt; /* reference count */
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bool rd_istemp; /* rel uses the local buffer mgr */
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bool rd_isnailed; /* rel is nailed in cache */
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bool rd_isvalid; /* relcache entry is valid */
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char rd_indexvalid; /* state of rd_indexlist: 0 = not valid, 1 =
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* valid, 2 = temporarily forced */
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SubTransactionId rd_createSubid; /* rel was created in current xact */
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SubTransactionId rd_newRelfilenodeSubid; /* new relfilenode assigned in
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* current xact */
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/*
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* rd_createSubid is the ID of the highest subtransaction the rel has
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* survived into; or zero if the rel was not created in the current top
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* transaction. This should be relied on only for optimization purposes;
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* it is possible for new-ness to be "forgotten" (eg, after CLUSTER).
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* Likewise, rd_newRelfilenodeSubid is the ID of the highest
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* subtransaction the relfilenode change has survived into, or zero if not
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* changed in the current transaction (or we have forgotten changing it).
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*/
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Form_pg_class rd_rel; /* RELATION tuple */
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TupleDesc rd_att; /* tuple descriptor */
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Oid rd_id; /* relation's object id */
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List *rd_indexlist; /* list of OIDs of indexes on relation */
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Bitmapset *rd_indexattr; /* identifies columns used in indexes */
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Oid rd_oidindex; /* OID of unique index on OID, if any */
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LockInfoData rd_lockInfo; /* lock mgr's info for locking relation */
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RuleLock *rd_rules; /* rewrite rules */
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MemoryContext rd_rulescxt; /* private memory cxt for rd_rules, if any */
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TriggerDesc *trigdesc; /* Trigger info, or NULL if rel has none */
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/*
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* rd_options is set whenever rd_rel is loaded into the relcache entry.
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* Note that you can NOT look into rd_rel for this data. NULL means "use
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* defaults".
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*/
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bytea *rd_options; /* parsed pg_class.reloptions */
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/* These are non-NULL only for an index relation: */
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Form_pg_index rd_index; /* pg_index tuple describing this index */
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struct HeapTupleData *rd_indextuple; /* all of pg_index tuple */
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/* "struct HeapTupleData *" avoids need to include htup.h here */
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Form_pg_am rd_am; /* pg_am tuple for index's AM */
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/*
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* index access support info (used only for an index relation)
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*
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* Note: only default operators and support procs for each opclass are
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* cached, namely those with lefttype and righttype equal to the opclass's
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* opcintype. The arrays are indexed by strategy or support number, which
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* is a sufficient identifier given that restriction.
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*
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* Note: rd_amcache is available for index AMs to cache private data about
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* an index. This must be just a cache since it may get reset at any time
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* (in particular, it will get reset by a relcache inval message for the
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* index). If used, it must point to a single memory chunk palloc'd in
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* rd_indexcxt. A relcache reset will include freeing that chunk and
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* setting rd_amcache = NULL.
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*/
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MemoryContext rd_indexcxt; /* private memory cxt for this stuff */
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RelationAmInfo *rd_aminfo; /* lookup info for funcs found in pg_am */
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Oid *rd_opfamily; /* OIDs of op families for each index col */
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Oid *rd_opcintype; /* OIDs of opclass declared input data types */
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Oid *rd_operator; /* OIDs of index operators */
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RegProcedure *rd_support; /* OIDs of support procedures */
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FmgrInfo *rd_supportinfo; /* lookup info for support procedures */
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int16 *rd_indoption; /* per-column AM-specific flags */
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List *rd_indexprs; /* index expression trees, if any */
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List *rd_indpred; /* index predicate tree, if any */
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void *rd_amcache; /* available for use by index AM */
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/* size of the FSM, or InvalidBlockNumber if not known yet */
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BlockNumber rd_fsm_nblocks;
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/* use "struct" here to avoid needing to include pgstat.h: */
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struct PgStat_TableStatus *pgstat_info; /* statistics collection area */
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} RelationData;
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/*
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* StdRdOptions
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* Standard contents of rd_options for heaps and generic indexes.
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*
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* RelationGetFillFactor() and RelationGetTargetPageFreeSpace() can only
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* be applied to relations that use this format or a superset for
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* private options data.
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*/
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typedef struct StdRdOptions
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{
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int32 vl_len_; /* varlena header (do not touch directly!) */
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int fillfactor; /* page fill factor in percent (0..100) */
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} StdRdOptions;
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#define HEAP_MIN_FILLFACTOR 10
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#define HEAP_DEFAULT_FILLFACTOR 100
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/*
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* RelationGetFillFactor
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* Returns the relation's fillfactor. Note multiple eval of argument!
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*/
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#define RelationGetFillFactor(relation, defaultff) \
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((relation)->rd_options ? \
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((StdRdOptions *) (relation)->rd_options)->fillfactor : (defaultff))
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/*
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* RelationGetTargetPageUsage
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* Returns the relation's desired space usage per page in bytes.
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*/
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#define RelationGetTargetPageUsage(relation, defaultff) \
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(BLCKSZ * RelationGetFillFactor(relation, defaultff) / 100)
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/*
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* RelationGetTargetPageFreeSpace
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* Returns the relation's desired freespace per page in bytes.
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*/
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#define RelationGetTargetPageFreeSpace(relation, defaultff) \
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(BLCKSZ * (100 - RelationGetFillFactor(relation, defaultff)) / 100)
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/*
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* RelationIsValid
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* True iff relation descriptor is valid.
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*/
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#define RelationIsValid(relation) PointerIsValid(relation)
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#define InvalidRelation ((Relation) NULL)
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/*
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* RelationHasReferenceCountZero
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* True iff relation reference count is zero.
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*
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* Note:
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* Assumes relation descriptor is valid.
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*/
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#define RelationHasReferenceCountZero(relation) \
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((bool)((relation)->rd_refcnt == 0))
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/*
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* RelationGetForm
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* Returns pg_class tuple for a relation.
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*
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* Note:
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* Assumes relation descriptor is valid.
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*/
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#define RelationGetForm(relation) ((relation)->rd_rel)
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/*
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* RelationGetRelid
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* Returns the OID of the relation
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*/
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#define RelationGetRelid(relation) ((relation)->rd_id)
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/*
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* RelationGetNumberOfAttributes
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* Returns the number of attributes in a relation.
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*/
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#define RelationGetNumberOfAttributes(relation) ((relation)->rd_rel->relnatts)
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/*
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* RelationGetDescr
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* Returns tuple descriptor for a relation.
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*/
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#define RelationGetDescr(relation) ((relation)->rd_att)
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/*
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* RelationGetRelationName
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* Returns the rel's name.
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*
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* Note that the name is only unique within the containing namespace.
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*/
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#define RelationGetRelationName(relation) \
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(NameStr((relation)->rd_rel->relname))
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/*
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* RelationGetNamespace
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* Returns the rel's namespace OID.
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*/
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#define RelationGetNamespace(relation) \
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((relation)->rd_rel->relnamespace)
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/*
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* RelationOpenSmgr
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* Open the relation at the smgr level, if not already done.
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*/
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#define RelationOpenSmgr(relation) \
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do { \
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if ((relation)->rd_smgr == NULL) \
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smgrsetowner(&((relation)->rd_smgr), smgropen((relation)->rd_node)); \
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} while (0)
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/*
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* RelationCloseSmgr
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* Close the relation at the smgr level, if not already done.
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*
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* Note: smgrclose should unhook from owner pointer, hence the Assert.
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*/
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#define RelationCloseSmgr(relation) \
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do { \
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if ((relation)->rd_smgr != NULL) \
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{ \
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smgrclose((relation)->rd_smgr); \
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Assert((relation)->rd_smgr == NULL); \
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} \
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} while (0)
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/*
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* RELATION_IS_LOCAL
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* If a rel is either temp or newly created in the current transaction,
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* it can be assumed to be visible only to the current backend.
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*
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* Beware of multiple eval of argument
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*/
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#define RELATION_IS_LOCAL(relation) \
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((relation)->rd_istemp || \
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(relation)->rd_createSubid != InvalidSubTransactionId)
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/* routines in utils/cache/relcache.c */
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extern void RelationIncrementReferenceCount(Relation rel);
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extern void RelationDecrementReferenceCount(Relation rel);
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#endif /* REL_H */
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