pg_upgrade: Remove converter plugin facility.

We've not found a use for this so far, and the current need, which
is to convert the visibility map to a new format, does not suit the
existing design anyway.  So just rip it out.

Author: Masahiko Sawada, slightly revised by me.
Discussion: 20160215211313.GB31273@momjian.us

Author: robertmhaas

src/bin/pg_upgrade/Makefile

@@ -8,7 +8,7 @@ top_builddir = ../../..
 include $(top_builddir)/src/Makefile.global
 
 OBJS = check.o controldata.o dump.o exec.o file.o function.o info.o \
-       option.o page.o parallel.o pg_upgrade.o relfilenode.o server.o \
+       option.o parallel.o pg_upgrade.o relfilenode.o server.o \
        tablespace.o util.o version.o $(WIN32RES)
 
 override CPPFLAGS := -DDLSUFFIX=\"$(DLSUFFIX)\" -I$(srcdir) -I$(libpq_srcdir) $(CPPFLAGS)

src/bin/pg_upgrade/check.c

@@ -80,8 +80,6 @@ check_and_dump_old_cluster(bool live_check)
 	if (!live_check)
 		start_postmaster(&old_cluster, true);
 
-	get_pg_database_relfilenode(&old_cluster);
-
 	/* Extract a list of databases and tables from the old cluster */
 	get_db_and_rel_infos(&old_cluster);
 

src/bin/pg_upgrade/file.c

@@ -23,17 +23,13 @@ static int	win32_pghardlink(const char *src, const char *dst);
 
 
 /*
- * copyAndUpdateFile()
+ * copyFile()
  *
- *	Copies a relation file from src to dst.  If pageConverter is non-NULL, this function
- *	uses that pageConverter to do a page-by-page conversion.
+ *	Copies a relation file from src to dst.
  */
 const char *
-copyAndUpdateFile(pageCnvCtx *pageConverter,
-				  const char *src, const char *dst, bool force)
+copyFile(const char *src, const char *dst, bool force)
 {
-	if (pageConverter == NULL)
-	{
 #ifndef WIN32
 		if (copy_file(src, dst, force) == -1)
 #else
@@ -42,70 +38,11 @@ copyAndUpdateFile(pageCnvCtx *pageConverter,
 			return getErrorText();
 		else
 			return NULL;
-	}
-	else
-	{
-		/*
-		 * We have a pageConverter object - that implies that the
-		 * PageLayoutVersion differs between the two clusters so we have to
-		 * perform a page-by-page conversion.
-		 *
-		 * If the pageConverter can convert the entire file at once, invoke
-		 * that plugin function, otherwise, read each page in the relation
-		 * file and call the convertPage plugin function.
-		 */
-
-#ifdef PAGE_CONVERSION
-		if (pageConverter->convertFile)
-			return pageConverter->convertFile(pageConverter->pluginData,
-											  dst, src);
-		else
-#endif
-		{
-			int			src_fd;
-			int			dstfd;
-			char		buf[BLCKSZ];
-			ssize_t		bytesRead;
-			const char *msg = NULL;
-
-			if ((src_fd = open(src, O_RDONLY, 0)) < 0)
-				return "could not open source file";
-
-			if ((dstfd = open(dst, O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR)) < 0)
-			{
-				close(src_fd);
-				return "could not create destination file";
-			}
-
-			while ((bytesRead = read(src_fd, buf, BLCKSZ)) == BLCKSZ)
-			{
-#ifdef PAGE_CONVERSION
-				if ((msg = pageConverter->convertPage(pageConverter->pluginData, buf, buf)) != NULL)
-					break;
-#endif
-				if (write(dstfd, buf, BLCKSZ) != BLCKSZ)
-				{
-					msg = "could not write new page to destination";
-					break;
-				}
-			}
-
-			close(src_fd);
-			close(dstfd);
-
-			if (msg)
-				return msg;
-			else if (bytesRead != 0)
-				return "found partial page in source file";
-			else
-				return NULL;
-		}
-	}
 }
 
 
 /*
- * linkAndUpdateFile()
+ * linkFile()
  *
  * Creates a hard link between the given relation files. We use
  * this function to perform a true in-place update. If the on-disk
@@ -114,12 +51,8 @@ copyAndUpdateFile(pageCnvCtx *pageConverter,
  * instead of copying the data from the old cluster to the new cluster.
  */
 const char *
-linkAndUpdateFile(pageCnvCtx *pageConverter,
-				  const char *src, const char *dst)
+linkFile(const char *src, const char *dst)
 {
-	if (pageConverter != NULL)
-		return "Cannot in-place update this cluster, page-by-page conversion is required";
-
 	if (pg_link_file(src, dst) == -1)
 		return getErrorText();
 	else

src/bin/pg_upgrade/page.c

@@ -260,8 +260,6 @@ prepare_new_cluster(void)
 			  new_cluster.bindir, cluster_conn_opts(&new_cluster),
 			  log_opts.verbose ? "--verbose" : "");
 	check_ok();
-
-	get_pg_database_relfilenode(&new_cluster);
 }
 
 

src/bin/pg_upgrade/pg_upgrade.c

@@ -269,7 +269,6 @@ typedef struct
 	uint32		major_version;	/* PG_VERSION of cluster */
 	char		major_version_str[64];	/* string PG_VERSION of cluster */
 	uint32		bin_version;	/* version returned from pg_ctl */
-	Oid			pg_database_oid;	/* OID of pg_database relation */
 	const char *tablespace_suffix;		/* directory specification */
 } ClusterInfo;
 
@@ -364,40 +363,8 @@ bool		pid_lock_file_exists(const char *datadir);
 
 /* file.c */
 
-#ifdef PAGE_CONVERSION
-typedef const char *(*pluginStartup) (uint16 migratorVersion,
-								uint16 *pluginVersion, uint16 newPageVersion,
-								   uint16 oldPageVersion, void **pluginData);
-typedef const char *(*pluginConvertFile) (void *pluginData,
-								   const char *dstName, const char *srcName);
-typedef const char *(*pluginConvertPage) (void *pluginData,
-								   const char *dstPage, const char *srcPage);
-typedef const char *(*pluginShutdown) (void *pluginData);
-
-typedef struct
-{
-	uint16		oldPageVersion; /* Page layout version of the old cluster		*/
-	uint16		newPageVersion; /* Page layout version of the new cluster		*/
-	uint16		pluginVersion;	/* API version of converter plugin */
-	void	   *pluginData;		/* Plugin data (set by plugin) */
-	pluginStartup startup;		/* Pointer to plugin's startup function */
-	pluginConvertFile convertFile;		/* Pointer to plugin's file converter
-										 * function */
-	pluginConvertPage convertPage;		/* Pointer to plugin's page converter
-										 * function */
-	pluginShutdown shutdown;	/* Pointer to plugin's shutdown function */
-} pageCnvCtx;
-
-const pageCnvCtx *setupPageConverter(void);
-#else
-/* dummy */
-typedef void *pageCnvCtx;
-#endif
-
-const char *copyAndUpdateFile(pageCnvCtx *pageConverter, const char *src,
-				  const char *dst, bool force);
-const char *linkAndUpdateFile(pageCnvCtx *pageConverter, const char *src,
-				  const char *dst);
+const char *copyFile(const char *src, const char *dst, bool force);
+const char *linkFile(const char *src, const char *dst);
 
 void		check_hard_link(void);
 FILE	   *fopen_priv(const char *path, const char *mode);