3 files changed, 7 insertions, 4 deletions
diff --git a/src/backend/storage/ipc/ipci.c b/src/backend/storage/ipc/ipci.c
index 0c86a581c03..853e1e472f6 100644
--- a/src/backend/storage/ipc/ipci.c
+++ b/src/backend/storage/ipc/ipci.c
@@ -27,6 +27,7 @@
 #include "postmaster/autovacuum.h"
 #include "postmaster/bgworker_internals.h"
 #include "postmaster/bgwriter.h"
+#include "postmaster/checksumhelper.h"
 #include "postmaster/postmaster.h"
 #include "replication/logicallauncher.h"
 #include "replication/slot.h"
@@ -261,6 +262,7 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
 	WalSndShmemInit();
 	WalRcvShmemInit();
 	ApplyLauncherShmemInit();
+	ChecksumHelperShmemInit();
 
 	/*
 	 * Set up other modules that need some shared memory space
diff --git a/src/backend/storage/page/README b/src/backend/storage/page/README
index 5127d98da37..f873fb0eea1 100644
--- a/src/backend/storage/page/README
+++ b/src/backend/storage/page/README
@@ -9,7 +9,8 @@ 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.
 
-Current implementation requires this be enabled system-wide at initdb time.
+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.
 
 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
diff --git a/src/backend/storage/page/bufpage.c b/src/backend/storage/page/bufpage.c
index dfbda5458fd..790e4b860ad 100644
--- a/src/backend/storage/page/bufpage.c
+++ b/src/backend/storage/page/bufpage.c
@@ -93,7 +93,7 @@ PageIsVerified(Page page, BlockNumber blkno)
 	 */
 	if (!PageIsNew(page))
 	{
-		if (DataChecksumsEnabled())
+		if (DataChecksumsNeedVerify())
 		{
 			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) || !DataChecksumsEnabled())
+	if (PageIsNew(page) || !DataChecksumsNeedWrite())
 		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) || !DataChecksumsEnabled())
+	if (PageIsNew(page) || !DataChecksumsNeedWrite())
 		return;
 
 	((PageHeader) page)->pd_checksum = pg_checksum_page((char *) page, blkno);