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pageinspect: Add page_checksum function

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Author: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Reviewed-by: Ashutosh Sharma <ashu.coek88@gmail.com>
This commit is contained in:
Peter Eisentraut
2017-03-17 09:49:10 -04:00
parent 64ae420b27
commit fef2bcdcba
5 changed files with 98 additions and 2 deletions
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6
contrib/pageinspect/expected/page.out
View File

@ -49,6 +49,12 @@ SELECT pagesize, version FROM page_header(get_raw_page('test1', 0));
8192 | 4
(1 row)
SELECT page_checksum(get_raw_page('test1', 0), 0) IS NOT NULL AS silly_checksum_test;
silly_checksum_test
---------------------
t
(1 row)
SELECT tuple_data_split('test1'::regclass, t_data, t_infomask, t_infomask2, t_bits)
FROM heap_page_items(get_raw_page('test1', 0));
tuple_data_split

8
contrib/pageinspect/pageinspect--1.5--1.6.sql
View File

@ -75,3 +75,11 @@ CREATE FUNCTION hash_metapage_info(IN page bytea,
OUT mapp int8[])
AS 'MODULE_PATHNAME', 'hash_metapage_info'
LANGUAGE C STRICT PARALLEL SAFE;
--
-- page_checksum()
--
CREATE FUNCTION page_checksum(IN page bytea, IN blkno int4)
RETURNS smallint
AS 'MODULE_PATHNAME', 'page_checksum'
LANGUAGE C STRICT PARALLEL SAFE;

37
contrib/pageinspect/rawpage.c
View File

@ -24,6 +24,7 @@
#include "funcapi.h"
#include "miscadmin.h"
#include "storage/bufmgr.h"
#include "storage/checksum.h"
#include "utils/builtins.h"
#include "utils/pg_lsn.h"
#include "utils/rel.h"
@ -280,3 +281,39 @@ page_header(PG_FUNCTION_ARGS)
PG_RETURN_DATUM(result);
}
/*
* page_checksum
*
* Compute checksum of a raw page
*/
PG_FUNCTION_INFO_V1(page_checksum);
Datum
page_checksum(PG_FUNCTION_ARGS)
{
bytea *raw_page = PG_GETARG_BYTEA_P(0);
uint32 blkno = PG_GETARG_INT32(1);
int raw_page_size;
PageHeader page;
if (!superuser())
ereport(ERROR,
(errcode(ERRCODE_INSUFFICIENT_PRIVILEGE),
(errmsg("must be superuser to use raw page functions"))));
raw_page_size = VARSIZE(raw_page) - VARHDRSZ;
/*
* Check that the supplied page is of the right size.
*/
if (raw_page_size != BLCKSZ)
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("incorrect size of input page (%d bytes)", raw_page_size)));
page = (PageHeader) VARDATA(raw_page);
PG_RETURN_INT16(pg_checksum_page((char *)page, blkno));
}

2
contrib/pageinspect/sql/page.sql
View File

@ -24,6 +24,8 @@ SELECT get_raw_page('test1', 0) = get_raw_page('test1', 'main', 0);
SELECT pagesize, version FROM page_header(get_raw_page('test1', 0));
SELECT page_checksum(get_raw_page('test1', 0), 0) IS NOT NULL AS silly_checksum_test;
SELECT tuple_data_split('test1'::regclass, t_data, t_infomask, t_infomask2, t_bits)
FROM heap_page_items(get_raw_page('test1', 0));