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Revert "Allow on-line enabling and disabling of data checksums"

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This reverts the backend sides of commit 1fde38beaa.
I have, at least for now, left the pg_verify_checksums tool in place, as
this tool can be very valuable without the rest of the patch as well,
and since it's a read-only tool that only runs when the cluster is down
it should be a lot safer.
This commit is contained in:
Magnus Hagander
2018-04-09 19:02:42 +02:00
parent 03c11796a9
commit a228cc13ae
39 changed files with 34 additions and 1658 deletions
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3
src/backend/storage/page/README
View File

@@ -9,8 +9,7 @@ have a very low measured incidence according to research on large server farms,
http://www.cs.toronto.edu/~bianca/papers/sigmetrics09.pdf, discussed
2010/12/22 on -hackers list.
Checksums can be enabled at initdb time, but can also be turned on and off
using pg_enable_data_checksums()/pg_disable_data_checksums() at runtime.
Current implementation requires this be enabled system-wide at initdb time.
The checksum is not valid at all times on a data page!!
The checksum is valid when the page leaves the shared pool and is checked

6
src/backend/storage/page/bufpage.c
View File

@@ -93,7 +93,7 @@ PageIsVerified(Page page, BlockNumber blkno)
*/
if (!PageIsNew(page))
{
if (DataChecksumsNeedVerify())
if (DataChecksumsEnabled())
{
checksum = pg_checksum_page((char *) page, blkno);
@@ -1168,7 +1168,7 @@ PageSetChecksumCopy(Page page, BlockNumber blkno)
static char *pageCopy = NULL;
/* If we don't need a checksum, just return the passed-in data */
if (PageIsNew(page) || !DataChecksumsNeedWrite())
if (PageIsNew(page) || !DataChecksumsEnabled())
return (char *) page;
/*
@@ -1195,7 +1195,7 @@ void
PageSetChecksumInplace(Page page, BlockNumber blkno)
{
/* If we don't need a checksum, just return */
if (PageIsNew(page) || !DataChecksumsNeedWrite())
if (PageIsNew(page) || !DataChecksumsEnabled())
return;
((PageHeader) page)->pd_checksum = pg_checksum_page((char *) page, blkno);