pg_freespacemap.c File Reference

#include "postgres.h"
#include "funcapi.h"
#include "storage/freespace.h"

Include dependency graph for pg_freespacemap.c:

Go to the source code of this file.

Functions
Datum	pg_freespace (PG_FUNCTION_ARGS)
	PG_FUNCTION_INFO_V1 (pg_freespace)
Variables
	PG_MODULE_MAGIC

---

Function Documentation

Datum pg_freespace

(

PG_FUNCTION_ARGS

)

Definition at line 26 of file pg_freespacemap.c.

References AccessShareLock, ereport, errcode(), errmsg(), ERROR, GetRecordedFreeSpace(), MaxBlockNumber, PG_GETARG_INT64, PG_GETARG_OID, PG_RETURN_INT16, relation_close(), and relation_open().

{
    Oid         relid = PG_GETARG_OID(0);
    int64       blkno = PG_GETARG_INT64(1);
    int16       freespace;
    Relation    rel;

    rel = relation_open(relid, AccessShareLock);

    if (blkno < 0 || blkno > MaxBlockNumber)
        ereport(ERROR,
                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                 errmsg("invalid block number")));

    freespace = GetRecordedFreeSpace(rel, blkno);

    relation_close(rel, AccessShareLock);
    PG_RETURN_INT16(freespace);
}

PG_FUNCTION_INFO_V1

(

pg_freespace

)

---

Variable Documentation

PG_MODULE_MAGIC

Definition at line 15 of file pg_freespacemap.c.