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postgres/src/backend/utils/misc/pg_controldata.c
Andres Freund fea10a6434 Rename VariableCacheData.nextFullXid to nextXid. 
Including Full in variable names duplicates the type information and
leads to overly long names. As FullTransactionId cannot accidentally
be casted to TransactionId that does not seem necessary.

Author: Andres Freund
Discussion: https://postgr.es/m/20200724011143.jccsyvsvymuiqfxu@alap3.anarazel.de
2020-08-11 12:07:14 -07:00

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/*-------------------------------------------------------------------------
*
* pg_controldata.c
*
* Routines to expose the contents of the control data file via
* a set of SQL functions.
*
* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/backend/utils/misc/pg_controldata.c
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/htup_details.h"
#include "access/transam.h"
#include "access/xlog.h"
#include "access/xlog_internal.h"
#include "catalog/pg_control.h"
#include "catalog/pg_type.h"
#include "common/controldata_utils.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/pg_lsn.h"
#include "utils/timestamp.h"
Datum
pg_control_system(PG_FUNCTION_ARGS)
{
Datum values[4];
bool nulls[4];
TupleDesc tupdesc;
HeapTuple htup;
ControlFileData *ControlFile;
bool crc_ok;
/*
* Construct a tuple descriptor for the result row. This must match this
* function's pg_proc entry!
*/
tupdesc = CreateTemplateTupleDesc(4);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "pg_control_version",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "catalog_version_no",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "system_identifier",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "pg_control_last_modified",
TIMESTAMPTZOID, -1, 0);
tupdesc = BlessTupleDesc(tupdesc);
/* read the control file */
ControlFile = get_controlfile(DataDir, &crc_ok);
if (!crc_ok)
ereport(ERROR,
(errmsg("calculated CRC checksum does not match value stored in file")));
values[0] = Int32GetDatum(ControlFile->pg_control_version);
nulls[0] = false;
values[1] = Int32GetDatum(ControlFile->catalog_version_no);
nulls[1] = false;
values[2] = Int64GetDatum(ControlFile->system_identifier);
nulls[2] = false;
values[3] = TimestampTzGetDatum(time_t_to_timestamptz(ControlFile->time));
nulls[3] = false;
htup = heap_form_tuple(tupdesc, values, nulls);
PG_RETURN_DATUM(HeapTupleGetDatum(htup));
}
Datum
pg_control_checkpoint(PG_FUNCTION_ARGS)
{
Datum values[19];
bool nulls[19];
TupleDesc tupdesc;
HeapTuple htup;
ControlFileData *ControlFile;
XLogSegNo segno;
char xlogfilename[MAXFNAMELEN];
bool crc_ok;
/*
* Construct a tuple descriptor for the result row. This must match this
* function's pg_proc entry!
*/
tupdesc = CreateTemplateTupleDesc(18);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "checkpoint_lsn",
LSNOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "redo_lsn",
LSNOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "redo_wal_file",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "timeline_id",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 5, "prev_timeline_id",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 6, "full_page_writes",
BOOLOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 7, "next_xid",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 8, "next_oid",
OIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 9, "next_multixact_id",
XIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 10, "next_multi_offset",
XIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 11, "oldest_xid",
XIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 12, "oldest_xid_dbid",
OIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 13, "oldest_active_xid",
XIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 14, "oldest_multi_xid",
XIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 15, "oldest_multi_dbid",
OIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 16, "oldest_commit_ts_xid",
XIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 17, "newest_commit_ts_xid",
XIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 18, "checkpoint_time",
TIMESTAMPTZOID, -1, 0);
tupdesc = BlessTupleDesc(tupdesc);
/* Read the control file. */
ControlFile = get_controlfile(DataDir, &crc_ok);
if (!crc_ok)
ereport(ERROR,
(errmsg("calculated CRC checksum does not match value stored in file")));
/*
* Calculate name of the WAL file containing the latest checkpoint's REDO
* start point.
*/
XLByteToSeg(ControlFile->checkPointCopy.redo, segno, wal_segment_size);
XLogFileName(xlogfilename, ControlFile->checkPointCopy.ThisTimeLineID,
segno, wal_segment_size);
/* Populate the values and null arrays */
values[0] = LSNGetDatum(ControlFile->checkPoint);
nulls[0] = false;
values[1] = LSNGetDatum(ControlFile->checkPointCopy.redo);
nulls[1] = false;
values[2] = CStringGetTextDatum(xlogfilename);
nulls[2] = false;
values[3] = Int32GetDatum(ControlFile->checkPointCopy.ThisTimeLineID);
nulls[3] = false;
values[4] = Int32GetDatum(ControlFile->checkPointCopy.PrevTimeLineID);
nulls[4] = false;
values[5] = BoolGetDatum(ControlFile->checkPointCopy.fullPageWrites);
nulls[5] = false;
values[6] = CStringGetTextDatum(psprintf("%u:%u",
EpochFromFullTransactionId(ControlFile->checkPointCopy.nextXid),
XidFromFullTransactionId(ControlFile->checkPointCopy.nextXid)));
nulls[6] = false;
values[7] = ObjectIdGetDatum(ControlFile->checkPointCopy.nextOid);
nulls[7] = false;
values[8] = TransactionIdGetDatum(ControlFile->checkPointCopy.nextMulti);
nulls[8] = false;
values[9] = TransactionIdGetDatum(ControlFile->checkPointCopy.nextMultiOffset);
nulls[9] = false;
values[10] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestXid);
nulls[10] = false;
values[11] = ObjectIdGetDatum(ControlFile->checkPointCopy.oldestXidDB);
nulls[11] = false;
values[12] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestActiveXid);
nulls[12] = false;
values[13] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestMulti);
nulls[13] = false;
values[14] = ObjectIdGetDatum(ControlFile->checkPointCopy.oldestMultiDB);
nulls[14] = false;
values[15] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestCommitTsXid);
nulls[15] = false;
values[16] = TransactionIdGetDatum(ControlFile->checkPointCopy.newestCommitTsXid);
nulls[16] = false;
values[17] = TimestampTzGetDatum(time_t_to_timestamptz(ControlFile->checkPointCopy.time));
nulls[17] = false;
htup = heap_form_tuple(tupdesc, values, nulls);
PG_RETURN_DATUM(HeapTupleGetDatum(htup));
}
Datum
pg_control_recovery(PG_FUNCTION_ARGS)
{
Datum values[5];
bool nulls[5];
TupleDesc tupdesc;
HeapTuple htup;
ControlFileData *ControlFile;
bool crc_ok;
/*
* Construct a tuple descriptor for the result row. This must match this
* function's pg_proc entry!
*/
tupdesc = CreateTemplateTupleDesc(5);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "min_recovery_end_lsn",
LSNOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "min_recovery_end_timeline",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "backup_start_lsn",
LSNOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "backup_end_lsn",
LSNOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 5, "end_of_backup_record_required",
BOOLOID, -1, 0);
tupdesc = BlessTupleDesc(tupdesc);
/* read the control file */
ControlFile = get_controlfile(DataDir, &crc_ok);
if (!crc_ok)
ereport(ERROR,
(errmsg("calculated CRC checksum does not match value stored in file")));
values[0] = LSNGetDatum(ControlFile->minRecoveryPoint);
nulls[0] = false;
values[1] = Int32GetDatum(ControlFile->minRecoveryPointTLI);
nulls[1] = false;
values[2] = LSNGetDatum(ControlFile->backupStartPoint);
nulls[2] = false;
values[3] = LSNGetDatum(ControlFile->backupEndPoint);
nulls[3] = false;
values[4] = BoolGetDatum(ControlFile->backupEndRequired);
nulls[4] = false;
htup = heap_form_tuple(tupdesc, values, nulls);
PG_RETURN_DATUM(HeapTupleGetDatum(htup));
}
Datum
pg_control_init(PG_FUNCTION_ARGS)
{
Datum values[11];
bool nulls[11];
TupleDesc tupdesc;
HeapTuple htup;
ControlFileData *ControlFile;
bool crc_ok;
/*
* Construct a tuple descriptor for the result row. This must match this
* function's pg_proc entry!
*/
tupdesc = CreateTemplateTupleDesc(11);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "max_data_alignment",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "database_block_size",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "blocks_per_segment",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "wal_block_size",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 5, "bytes_per_wal_segment",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 6, "max_identifier_length",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 7, "max_index_columns",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 8, "max_toast_chunk_size",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 9, "large_object_chunk_size",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 10, "float8_pass_by_value",
BOOLOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 11, "data_page_checksum_version",
INT4OID, -1, 0);
tupdesc = BlessTupleDesc(tupdesc);
/* read the control file */
ControlFile = get_controlfile(DataDir, &crc_ok);
if (!crc_ok)
ereport(ERROR,
(errmsg("calculated CRC checksum does not match value stored in file")));
values[0] = Int32GetDatum(ControlFile->maxAlign);
nulls[0] = false;
values[1] = Int32GetDatum(ControlFile->blcksz);
nulls[1] = false;
values[2] = Int32GetDatum(ControlFile->relseg_size);
nulls[2] = false;
values[3] = Int32GetDatum(ControlFile->xlog_blcksz);
nulls[3] = false;
values[4] = Int32GetDatum(ControlFile->xlog_seg_size);
nulls[4] = false;
values[5] = Int32GetDatum(ControlFile->nameDataLen);
nulls[5] = false;
values[6] = Int32GetDatum(ControlFile->indexMaxKeys);
nulls[6] = false;
values[7] = Int32GetDatum(ControlFile->toast_max_chunk_size);
nulls[7] = false;
values[8] = Int32GetDatum(ControlFile->loblksize);
nulls[8] = false;
values[9] = BoolGetDatum(ControlFile->float8ByVal);
nulls[9] = false;
values[10] = Int32GetDatum(ControlFile->data_checksum_version);
nulls[10] = false;
htup = heap_form_tuple(tupdesc, values, nulls);
PG_RETURN_DATUM(HeapTupleGetDatum(htup));
}
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