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

This reverts the backend sides of commit 1fde38beaa0c3e66c340efc7cc0dc272d6254bb0.
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.

1 files changed, 0 insertions, 31 deletions

diff --git a/src/include/postmaster/checksumhelper.h b/src/include/postmaster/checksumhelper.h
deleted file mode 100644
index 289bf2a9358..00000000000
--- a/src/include/postmaster/checksumhelper.h
+++ /dev/null
@@ -1,31 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * 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 */