src/include/storage/freespace.h

   1 /*-------------------------------------------------------------------------
   2  *
   3  * freespace.h
   4  *        POSTGRES free space map for quickly finding free space in relations
   5  *
   6  *
   7  * Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
   8  * Portions Copyright (c) 1994, Regents of the University of California
   9  *
  10  * src/include/storage/freespace.h
  11  *
  12  *-------------------------------------------------------------------------
  13  */
  14 #ifndef FREESPACE_H_
  15 #define FREESPACE_H_
  16
  17 #include "storage/block.h"
  18 #include "storage/relfilenode.h"
  19 #include "utils/relcache.h"
  20
  21 /* prototypes for public functions in freespace.c */
  22 extern Size GetRecordedFreeSpace(Relation rel, BlockNumber heapBlk);
  23 extern BlockNumber GetPageWithFreeSpace(Relation rel, Size spaceNeeded);
  24 extern BlockNumber RecordAndGetPageWithFreeSpace(Relation rel,
  25                                                                                                  BlockNumber oldPage,
  26                                                                                                  Size oldSpaceAvail,
  27                                                                                                  Size spaceNeeded);
  28 extern void RecordPageWithFreeSpace(Relation rel, BlockNumber heapBlk,
  29                                                                         Size spaceAvail);
  30 extern void XLogRecordPageWithFreeSpace(RelFileNode rnode, BlockNumber heapBlk,
  31                                                                                 Size spaceAvail);
  32
  33 extern BlockNumber FreeSpaceMapPrepareTruncateRel(Relation rel,
  34                                                                                                   BlockNumber nblocks);
  35 extern void FreeSpaceMapVacuum(Relation rel);
  36 extern void FreeSpaceMapVacuumRange(Relation rel, BlockNumber start,
  37                                                                         BlockNumber end);
  38
  39 #endif                                                  /* FREESPACE_H_ */