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Migrate page checksum filter to C.

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This filter exactly mimics the behavior of the Perl filter so is a drop-in replacement.

The filter is not integrated yet since it requires the Perl-to-C storage layer interface coming in a future commit.
This commit is contained in:
David Steele
2019-06-17 07:52:03 -04:00
parent 892f35a728
commit ceafd8e19d
10 changed files with 457 additions and 13 deletions
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19
src/postgres/pageChecksum.c
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@ -69,6 +69,7 @@ minimize register spilling. For less sophisticated compilers it might be benefic
#include "common/debug.h"
#include "common/error.h"
#include "common/log.h"
#include "postgres/interface.h"
#include "postgres/pageChecksum.h"
/***********************************************************************************************************************************
@ -203,6 +204,20 @@ pageChecksum(const unsigned char *page, unsigned int blockNo, unsigned int pageS
FUNCTION_TEST_RETURN((uint16_t)(checksum % 65535 + 1));
}
/***********************************************************************************************************************************
Return the lsn for a page
***********************************************************************************************************************************/
uint64_t
pageLsn(const unsigned char *page)
{
FUNCTION_TEST_BEGIN();
FUNCTION_TEST_PARAM_P(UCHARDATA, page);
FUNCTION_TEST_END();
// Reduce to a uint16 with an offset of one. That avoids checksums of zero, which seems like a good idea.
FUNCTION_TEST_RETURN((uint64_t)((PageHeader)page)->pd_lsn.walid << 32 | ((PageHeader)page)->pd_lsn.xrecoff);
}
/***********************************************************************************************************************************
pageChecksumTest - test if checksum is valid for a single page
***********************************************************************************************************************************/
@ -225,8 +240,8 @@ pageChecksumTest(
((PageHeader)page)->pd_upper == 0 ||
// LSN is after the backup started so checksum is not tested because pages may be torn
(((PageHeader)page)->pd_lsn.walid >= ignoreWalId && ((PageHeader)page)->pd_lsn.xrecoff >= ignoreWalOffset) ||
// Checksum is valid
((PageHeader)page)->pd_checksum == pageChecksum(page, blockNo, pageSize));
// Checksum is valid if a full page
(pageSize == PG_PAGE_SIZE_DEFAULT && ((PageHeader)page)->pd_checksum == pageChecksum(page, blockNo, pageSize)));
}
/***********************************************************************************************************************************