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Record data_checksum_version in control file.

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The value is not used anywhere in code, but will
allow future changes to the checksum version
should that become necessary in the future.
This commit is contained in:
Simon Riggs
2013-04-30 12:27:12 +01:00
parent 730924397c
commit 443951748c
6 changed files with 16 additions and 12 deletions
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4
src/include/catalog/pg_control.h
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@@ -213,8 +213,8 @@ typedef struct ControlFileData
bool float4ByVal; /* float4 pass-by-value? */
bool float8ByVal; /* float8, int8, etc pass-by-value? */
/* Are data pages protected by checksums? */
bool data_checksums;
/* Are data pages protected by checksums? Zero if no checksum version */
uint32 data_checksum_version;
/* CRC of all above ... MUST BE LAST! */
pg_crc32 crc;

5
src/include/storage/bufpage.h
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@@ -189,9 +189,12 @@ typedef PageHeaderData *PageHeader;
* Release 8.3 uses 4; it changed the HeapTupleHeader layout again, and
* added the pd_flags field (by stealing some bits from pd_tli),
* as well as adding the pd_prune_xid field (which enlarges the header).
*
* As of Release 9.3, the checksum version must also be considered when
* handling pages.
*/
#define PG_PAGE_LAYOUT_VERSION 4
#define PG_DATA_CHECKSUM_VERSION 1
/* ----------------------------------------------------------------
* page support macros