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/*-------------------------------------------------------------------------
*
* indexfsm.c
* POSTGRES free space map for quickly finding free pages in relations
*
*
* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/backend/storage/freespace/indexfsm.c
*
*
* NOTES:
*
* This is similar to the FSM used for heap, in freespace.c, but instead
* of tracking the amount of free space on pages, we only track whether
* pages are completely free or in-use. We use the same FSM implementation
* as for heaps, using BLCKSZ - 1 to denote used pages, and 0 for unused.
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "storage/freespace.h"
#include "storage/indexfsm.h"
/*
* Exported routines
*/
/*
* GetFreeIndexPage - return a free page from the FSM
*
* As a side effect, the page is marked as used in the FSM.
*/
BlockNumber
GetFreeIndexPage(Relation rel)
{
BlockNumber blkno = GetPageWithFreeSpace(rel, BLCKSZ / 2);
if (blkno != InvalidBlockNumber)
RecordUsedIndexPage(rel, blkno);
return blkno;
}
/*
* RecordFreeIndexPage - mark a page as free in the FSM
*/
void
RecordFreeIndexPage(Relation rel, BlockNumber freeBlock)
{
RecordPageWithFreeSpace(rel, freeBlock, BLCKSZ - 1);
}
/*
* RecordUsedIndexPage - mark a page as used in the FSM
*/
void
RecordUsedIndexPage(Relation rel, BlockNumber usedBlock)
{
RecordPageWithFreeSpace(rel, usedBlock, 0);
}
/*
* IndexFreeSpaceMapVacuum - scan and fix any inconsistencies in the FSM
*/
void
IndexFreeSpaceMapVacuum(Relation rel)
{
FreeSpaceMapVacuum(rel);
}
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