From 0892ecbc015930dde2cee9ad464b9b70fdb7667e Mon Sep 17 00:00:00 2001
From: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: Mon, 16 Sep 2013 14:36:01 +0300
Subject: [PATCH] Add a GUC to report whether data page checksums are enabled.
Bernd Helmle
---
doc/src/sgml/config.sgml | 13 +++++++++++++
src/backend/access/transam/xlog.c | 4 ++++
src/backend/utils/misc/guc.c | 12 ++++++++++++
3 files changed, 29 insertions(+)
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 18d75be1d79..370aa09ee7c 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -6169,6 +6169,19 @@ dynamic_library_path = 'C:\tools\postgresql;H:\my_project\lib;$libdir'
</listitem>
</varlistentry>
+ <varlistentry id="guc-data-checksums" xreflabel="data_checksums">
+ <term><varname>data_checksums</varname> (<type>boolean</type>)</term>
+ <indexterm>
+ <primary><varname>data_checksums</> configuration parameter</primary>
+ </indexterm>
+ <listitem>
+ <para>
+ Reports whether data checksums are enabled for this cluster.
+ See <xref linkend="app-initdb-data-checksums"> for more information.
+ </para>
+ </listitem>
+ </varlistentry>
+
<varlistentry id="guc-integer-datetimes" xreflabel="integer_datetimes">
<term><varname>integer_datetimes</varname> (<type>boolean</type>)</term>
<indexterm>
diff --git a/src/backend/access/transam/xlog.c b/src/backend/access/transam/xlog.c
index dc47c4760bf..fc495d6a62d 100644
--- a/src/backend/access/transam/xlog.c
+++ b/src/backend/access/transam/xlog.c
@@ -4844,6 +4844,10 @@ ReadControlFile(void)
" but the server was compiled without USE_FLOAT8_BYVAL."),
errhint("It looks like you need to recompile or initdb.")));
#endif
+
+ /* Make the fixed settings visible as GUC variables, too */
+ SetConfigOption("data_checksums", DataChecksumsEnabled() ? "yes" : "no",
+ PGC_INTERNAL, PGC_S_OVERRIDE);
}
void
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index 7d297bcd343..3107f9cf027 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -466,6 +466,7 @@ static int max_identifier_length;
static int block_size;
static int segment_size;
static int wal_block_size;
+static bool data_checksums;
static int wal_segment_size;
static bool integer_datetimes;
static int effective_io_concurrency;
@@ -1457,6 +1458,17 @@ static struct config_bool ConfigureNamesBool[] =
NULL, NULL, NULL
},
+ {
+ {"data_checksums", PGC_INTERNAL, PRESET_OPTIONS,
+ gettext_noop("Shows whether data checksums are turned on for this cluster"),
+ NULL,
+ GUC_NOT_IN_SAMPLE | GUC_DISALLOW_IN_FILE
+ },
+ &data_checksums,
+ false,
+ NULL, NULL, NULL
+ },
+
/* End-of-list marker */
{
{NULL, 0, 0, NULL, NULL}, NULL, false, NULL, NULL, NULL
--
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