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postgresql/src/include/storage/indexfsm.h

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Rewrite the FSM. Instead of relying on a fixed-size shared memory segment, the free space information is stored in a dedicated FSM relation fork, with each relation (except for hash indexes; they don't use FSM). This eliminates the max_fsm_relations and max_fsm_pages GUC options; remove any trace of them from the backend, initdb, and documentation. Rewrite contrib/pg_freespacemap to match the new FSM implementation. Also introduce a new variant of the get_raw_page(regclass, int4, int4) function in contrib/pageinspect that let's you to return pages from any relation fork, and a new fsm_page_contents() function to inspect the new FSM pages.
2008-09-30 12:52:14 +02:00
/*-------------------------------------------------------------------------
*
* indexfsm.h
* POSTGRES free space map for quickly finding an unused page in index
*
*
* Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/storage/indexfsm.h,v 1.1 2008/09/30 10:52:14 heikki Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef INDEXFSM_H_
#define INDEXFSM_H_
#include "utils/rel.h"
extern void InitIndexFreeSpaceMap(Relation rel);
extern BlockNumber GetFreeIndexPage(Relation rel);
extern void RecordFreeIndexPage(Relation rel, BlockNumber page);
extern void RecordUsedIndexPage(Relation rel, BlockNumber page);
extern void IndexFreeSpaceMapTruncate(Relation rel, BlockNumber nblocks);
#endif /* INDEXFSM_H */