9 files changed, 64 insertions, 4 deletions
diff --git a/src/include/access/xlog.h b/src/include/access/xlog.h
index 421ba6d7755..f21870c6443 100644
--- a/src/include/access/xlog.h
+++ b/src/include/access/xlog.h
@@ -154,7 +154,7 @@ extern PGDLLIMPORT int wal_level;
  * of the bits make it to disk, but the checksum wouldn't match.  Also WAL-log
  * them if forced by wal_log_hints=on.
  */
-#define XLogHintBitIsNeeded() (DataChecksumsEnabled() || wal_log_hints)
+#define XLogHintBitIsNeeded() (DataChecksumsNeedWrite() || wal_log_hints)
 
 /* Do we need to WAL-log information required only for Hot Standby and logical replication? */
 #define XLogStandbyInfoActive() (wal_level >= WAL_LEVEL_REPLICA)
@@ -257,7 +257,13 @@ extern char *XLogFileNameP(TimeLineID tli, XLogSegNo segno);
 extern void UpdateControlFile(void);
 extern uint64 GetSystemIdentifier(void);
 extern char *GetMockAuthenticationNonce(void);
-extern bool DataChecksumsEnabled(void);
+extern bool DataChecksumsNeedWrite(void);
+extern bool DataChecksumsNeedVerify(void);
+extern bool DataChecksumsInProgress(void);
+extern void SetDataChecksumsInProgress(void);
+extern void SetDataChecksumsOn(void);
+extern void SetDataChecksumsOff(void);
+extern const char *show_data_checksums(void);
 extern XLogRecPtr GetFakeLSNForUnloggedRel(void);
 extern Size XLOGShmemSize(void);
 extern void XLOGShmemInit(void);
diff --git a/src/include/access/xlog_internal.h b/src/include/access/xlog_internal.h
index a5c074642f6..0530fd1a43c 100644
--- a/src/include/access/xlog_internal.h
+++ b/src/include/access/xlog_internal.h
@@ -25,6 +25,7 @@
 #include "lib/stringinfo.h"
 #include "pgtime.h"
 #include "storage/block.h"
+#include "storage/checksum.h"
 #include "storage/relfilenode.h"
 
 
@@ -240,6 +241,12 @@ typedef struct xl_restore_point
 	char		rp_name[MAXFNAMELEN];
 } xl_restore_point;
 
+/* Information logged when checksum level is changed */
+typedef struct xl_checksum_state
+{
+	ChecksumType new_checksumtype;
+}			xl_checksum_state;
+
 /* End of recovery mark, when we don't do an END_OF_RECOVERY checkpoint */
 typedef struct xl_end_of_recovery
 {
diff --git a/src/include/catalog/catversion.h b/src/include/catalog/catversion.h
index 5f63efc3552..cbeca5776bd 100644
--- a/src/include/catalog/catversion.h
+++ b/src/include/catalog/catversion.h
@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	201804051
+#define CATALOG_VERSION_NO	201804052
 
 #endif
diff --git a/src/include/catalog/pg_control.h b/src/include/catalog/pg_control.h
index 773d9e6ebae..33c59f9a630 100644
--- a/src/include/catalog/pg_control.h
+++ b/src/include/catalog/pg_control.h
@@ -76,6 +76,7 @@ typedef struct CheckPoint
 #define XLOG_END_OF_RECOVERY			0x90
 #define XLOG_FPI_FOR_HINT				0xA0
 #define XLOG_FPI						0xB0
+#define XLOG_CHECKSUMS					0xC0
 
 
 /*
diff --git a/src/include/catalog/pg_proc.h b/src/include/catalog/pg_proc.h
index edf212fcf0f..02be8a5fbdf 100644
--- a/src/include/catalog/pg_proc.h
+++ b/src/include/catalog/pg_proc.h
@@ -5583,6 +5583,11 @@ DESCR("pg_controldata recovery state information as a function");
 DATA(insert OID = 3444 ( pg_control_init PGNSP PGUID 12 1 0 0 0 f f f t f v s 0 0 2249 "" "{23,23,23,23,23,23,23,23,23,16,16,23}" "{o,o,o,o,o,o,o,o,o,o,o,o}" "{max_data_alignment,database_block_size,blocks_per_segment,wal_block_size,bytes_per_wal_segment,max_identifier_length,max_index_columns,max_toast_chunk_size,large_object_chunk_size,float4_pass_by_value,float8_pass_by_value,data_page_checksum_version}" _null_ _null_ pg_control_init _null_ _null_ _null_ ));
 DESCR("pg_controldata init state information as a function");
 
+DATA(insert OID = 3996 ( pg_disable_data_checksums		PGNSP PGUID 12 1 0 0 0 f f f t f v s 0 0 2278 "" _null_ _null_ _null_ _null_ _null_ disable_data_checksums _null_ _null_ _null_ ));
+DESCR("disable data checksums");
+DATA(insert OID = 3998 ( pg_enable_data_checksums		PGNSP PGUID 12 1 0 0 0 f f f t f v s 2 0 2278 "23 23" _null_ _null_ "{cost_delay,cost_limit}" _null_ _null_ enable_data_checksums _null_ _null_ _null_ ));
+DESCR("enable data checksums");
+
 /* collation management functions */
 DATA(insert OID = 3445 ( pg_import_system_collations PGNSP PGUID 12 100 0 0 0 f f f t f v u 1 0 23 "4089" _null_ _null_ _null_ _null_ _null_ pg_import_system_collations _null_ _null_ _null_ ));
 DESCR("import collations from operating system");
diff --git a/src/include/pgstat.h b/src/include/pgstat.h
index be2f59239bf..4ed9ed76cc2 100644
--- a/src/include/pgstat.h
+++ b/src/include/pgstat.h
@@ -710,7 +710,9 @@ typedef enum BackendType
 	B_STARTUP,
 	B_WAL_RECEIVER,
 	B_WAL_SENDER,
-	B_WAL_WRITER
+	B_WAL_WRITER,
+	B_CHECKSUMHELPER_LAUNCHER,
+	B_CHECKSUMHELPER_WORKER
 } BackendType;
 
 
diff --git a/src/include/postmaster/checksumhelper.h b/src/include/postmaster/checksumhelper.h
new file mode 100644
index 00000000000..289bf2a9358
--- /dev/null
+++ b/src/include/postmaster/checksumhelper.h
@@ -0,0 +1,31 @@
+/*-------------------------------------------------------------------------
+ *
+ * checksumhelper.h
+ *	  header file for checksum helper background worker
+ *
+ *
+ * Portions Copyright (c) 1996-2018, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/postmaster/checksumhelper.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef CHECKSUMHELPER_H
+#define CHECKSUMHELPER_H
+
+/* Shared memory */
+extern Size ChecksumHelperShmemSize(void);
+extern void ChecksumHelperShmemInit(void);
+
+/* Start the background processes for enabling checksums */
+bool		StartChecksumHelperLauncher(int cost_delay, int cost_limit);
+
+/* Shutdown the background processes, if any */
+void		ShutdownChecksumHelperIfRunning(void);
+
+/* Background worker entrypoints */
+void		ChecksumHelperLauncherMain(Datum arg);
+void		ChecksumHelperWorkerMain(Datum arg);
+
+#endif							/* CHECKSUMHELPER_H */
diff --git a/src/include/storage/bufpage.h b/src/include/storage/bufpage.h
index 85dd10c45a3..bd46bf2ce6e 100644
--- a/src/include/storage/bufpage.h
+++ b/src/include/storage/bufpage.h
@@ -194,6 +194,7 @@ typedef PageHeaderData *PageHeader;
  */
 #define PG_PAGE_LAYOUT_VERSION		4
 #define PG_DATA_CHECKSUM_VERSION	1
+#define PG_DATA_CHECKSUM_INPROGRESS_VERSION		2
 
 /* ----------------------------------------------------------------
  *						page support macros
diff --git a/src/include/storage/checksum.h b/src/include/storage/checksum.h
index 433755e279f..902ec29e2a5 100644
--- a/src/include/storage/checksum.h
+++ b/src/include/storage/checksum.h
@@ -15,6 +15,13 @@
 
 #include "storage/block.h"
 
+typedef enum ChecksumType
+{
+	DATA_CHECKSUMS_OFF = 0,
+	DATA_CHECKSUMS_ON,
+	DATA_CHECKSUMS_INPROGRESS
+}			ChecksumType;
+
 /*
  * Compute the checksum for a Postgres page.  The page must be aligned on a
  * 4-byte boundary.