Move relpath() to libpgcommon

This enables non-backend code, such as pg_xlogdump, to use it easily.
The previous location, in src/backend/catalog/catalog.c, made that
essentially impossible because that file depends on many backend-only
facilities; so this needs to live separately.

src/backend/Makefile

@@ -35,10 +35,12 @@ LOCALOBJS += utils/probes.o
 endif
 endif
 
-OBJS = $(SUBDIROBJS) $(LOCALOBJS) $(top_builddir)/src/port/libpgport_srv.a
+OBJS = $(SUBDIROBJS) $(LOCALOBJS) $(top_builddir)/src/port/libpgport_srv.a \
+       $(top_builddir)/src/common/libpgcommon_srv.a
 
-# We put libpgport into OBJS, so remove it from LIBS; also add libldap
-LIBS := $(filter-out -lpgport, $(LIBS)) $(LDAP_LIBS_BE)
+# We put libpgport and libpgcommon into OBJS, so remove it from LIBS; also add
+# libldap
+LIBS := $(filter-out -lpgport -lpgcommon, $(LIBS)) $(LDAP_LIBS_BE)
 
 # The backend doesn't need everything that's in LIBS, however
 LIBS := $(filter-out -lz -lreadline -ledit -ltermcap -lncurses -lcurses, $(LIBS))

src/backend/access/rmgrdesc/smgrdesc.c

@@ -16,6 +16,7 @@
 
 #include "catalog/catalog.h"
 #include "catalog/storage_xlog.h"
+#include "common/relpath.h"
 
 
 void

src/backend/access/rmgrdesc/xactdesc.c

@@ -16,6 +16,7 @@
 
 #include "access/xact.h"
 #include "catalog/catalog.h"
+#include "common/relpath.h"
 #include "storage/sinval.h"
 #include "utils/timestamp.h"
 

src/backend/access/transam/xlogutils.c

@@ -20,6 +20,7 @@
 #include "access/xlog.h"
 #include "access/xlogutils.h"
 #include "catalog/catalog.h"
+#include "common/relpath.h"
 #include "storage/smgr.h"
 #include "utils/guc.h"
 #include "utils/hsearch.h"

src/backend/catalog/catalog.c

@@ -37,6 +37,7 @@
 #include "catalog/pg_shseclabel.h"
 #include "catalog/pg_tablespace.h"
 #include "catalog/toasting.h"
+#include "common/relpath.h"
 #include "miscadmin.h"
 #include "storage/fd.h"
 #include "utils/fmgroids.h"
@@ -44,21 +45,6 @@
 #include "utils/tqual.h"
 
 
-#define FORKNAMECHARS	4		/* max chars for a fork name */
-
-/*
- * Lookup table of fork name by fork number.
- *
- * If you add a new entry, remember to update the errhint below, and the
- * documentation for pg_relation_size(). Also keep FORKNAMECHARS above
- * up-to-date.
- */
-const char *forkNames[] = {
-	"main",						/* MAIN_FORKNUM */
-	"fsm",						/* FSM_FORKNUM */
-	"vm",						/* VISIBILITYMAP_FORKNUM */
-	"init"						/* INIT_FORKNUM */
-};
 
 /*
  * forkname_to_number - look up fork number by name
@@ -79,130 +65,6 @@ forkname_to_number(char *forkName)
 	return InvalidForkNumber;	/* keep compiler quiet */
 }
 
-/*
- * forkname_chars
- *		We use this to figure out whether a filename could be a relation
- *		fork (as opposed to an oddly named stray file that somehow ended
- *		up in the database directory).	If the passed string begins with
- *		a fork name (other than the main fork name), we return its length,
- *		and set *fork (if not NULL) to the fork number.  If not, we return 0.
- *
- * Note that the present coding assumes that there are no fork names which
- * are prefixes of other fork names.
- */
-int
-forkname_chars(const char *str, ForkNumber *fork)
-{
-	ForkNumber	forkNum;
-
-	for (forkNum = 1; forkNum <= MAX_FORKNUM; forkNum++)
-	{
-		int			len = strlen(forkNames[forkNum]);
-
-		if (strncmp(forkNames[forkNum], str, len) == 0)
-		{
-			if (fork)
-				*fork = forkNum;
-			return len;
-		}
-	}
-	return 0;
-}
-
-/*
- * relpathbackend - construct path to a relation's file
- *
- * Result is a palloc'd string.
- */
-char *
-relpathbackend(RelFileNode rnode, BackendId backend, ForkNumber forknum)
-{
-	int			pathlen;
-	char	   *path;
-
-	if (rnode.spcNode == GLOBALTABLESPACE_OID)
-	{
-		/* Shared system relations live in {datadir}/global */
-		Assert(rnode.dbNode == 0);
-		Assert(backend == InvalidBackendId);
-		pathlen = 7 + OIDCHARS + 1 + FORKNAMECHARS + 1;
-		path = (char *) palloc(pathlen);
-		if (forknum != MAIN_FORKNUM)
-			snprintf(path, pathlen, "global/%u_%s",
-					 rnode.relNode, forkNames[forknum]);
-		else
-			snprintf(path, pathlen, "global/%u", rnode.relNode);
-	}
-	else if (rnode.spcNode == DEFAULTTABLESPACE_OID)
-	{
-		/* The default tablespace is {datadir}/base */
-		if (backend == InvalidBackendId)
-		{
-			pathlen = 5 + OIDCHARS + 1 + OIDCHARS + 1 + FORKNAMECHARS + 1;
-			path = (char *) palloc(pathlen);
-			if (forknum != MAIN_FORKNUM)
-				snprintf(path, pathlen, "base/%u/%u_%s",
-						 rnode.dbNode, rnode.relNode,
-						 forkNames[forknum]);
-			else
-				snprintf(path, pathlen, "base/%u/%u",
-						 rnode.dbNode, rnode.relNode);
-		}
-		else
-		{
-			/* OIDCHARS will suffice for an integer, too */
-			pathlen = 5 + OIDCHARS + 2 + OIDCHARS + 1 + OIDCHARS + 1
-				+ FORKNAMECHARS + 1;
-			path = (char *) palloc(pathlen);
-			if (forknum != MAIN_FORKNUM)
-				snprintf(path, pathlen, "base/%u/t%d_%u_%s",
-						 rnode.dbNode, backend, rnode.relNode,
-						 forkNames[forknum]);
-			else
-				snprintf(path, pathlen, "base/%u/t%d_%u",
-						 rnode.dbNode, backend, rnode.relNode);
-		}
-	}
-	else
-	{
-		/* All other tablespaces are accessed via symlinks */
-		if (backend == InvalidBackendId)
-		{
-			pathlen = 9 + 1 + OIDCHARS + 1
-				+ strlen(TABLESPACE_VERSION_DIRECTORY) + 1 + OIDCHARS + 1
-				+ OIDCHARS + 1 + FORKNAMECHARS + 1;
-			path = (char *) palloc(pathlen);
-			if (forknum != MAIN_FORKNUM)
-				snprintf(path, pathlen, "pg_tblspc/%u/%s/%u/%u_%s",
-						 rnode.spcNode, TABLESPACE_VERSION_DIRECTORY,
-						 rnode.dbNode, rnode.relNode,
-						 forkNames[forknum]);
-			else
-				snprintf(path, pathlen, "pg_tblspc/%u/%s/%u/%u",
-						 rnode.spcNode, TABLESPACE_VERSION_DIRECTORY,
-						 rnode.dbNode, rnode.relNode);
-		}
-		else
-		{
-			/* OIDCHARS will suffice for an integer, too */
-			pathlen = 9 + 1 + OIDCHARS + 1
-				+ strlen(TABLESPACE_VERSION_DIRECTORY) + 1 + OIDCHARS + 2
-				+ OIDCHARS + 1 + OIDCHARS + 1 + FORKNAMECHARS + 1;
-			path = (char *) palloc(pathlen);
-			if (forknum != MAIN_FORKNUM)
-				snprintf(path, pathlen, "pg_tblspc/%u/%s/%u/t%d_%u_%s",
-						 rnode.spcNode, TABLESPACE_VERSION_DIRECTORY,
-						 rnode.dbNode, backend, rnode.relNode,
-						 forkNames[forknum]);
-			else
-				snprintf(path, pathlen, "pg_tblspc/%u/%s/%u/t%d_%u",
-						 rnode.spcNode, TABLESPACE_VERSION_DIRECTORY,
-						 rnode.dbNode, backend, rnode.relNode);
-		}
-	}
-	return path;
-}
-
 /*
  * GetDatabasePath			- construct path to a database dir
  *

src/backend/commands/tablespace.c

@@ -64,6 +64,7 @@
 #include "commands/comment.h"
 #include "commands/seclabel.h"
 #include "commands/tablespace.h"
+#include "common/relpath.h"
 #include "miscadmin.h"
 #include "postmaster/bgwriter.h"
 #include "storage/fd.h"

src/backend/storage/buffer/bufmgr.c

@@ -34,6 +34,7 @@
 #include <unistd.h>
 
 #include "catalog/catalog.h"
+#include "common/relpath.h"
 #include "executor/instrument.h"
 #include "miscadmin.h"
 #include "pg_trace.h"

src/backend/storage/buffer/localbuf.c

@@ -16,6 +16,7 @@
 #include "postgres.h"
 
 #include "catalog/catalog.h"
+#include "common/relpath.h"
 #include "executor/instrument.h"
 #include "storage/buf_internals.h"
 #include "storage/bufmgr.h"

src/backend/storage/file/fd.c

@@ -71,6 +71,7 @@
 #include "access/xact.h"
 #include "catalog/catalog.h"
 #include "catalog/pg_tablespace.h"
+#include "common/relpath.h"
 #include "pgstat.h"
 #include "storage/fd.h"
 #include "storage/ipc.h"

src/backend/storage/file/reinit.c

@@ -17,6 +17,7 @@
 #include <unistd.h>
 
 #include "catalog/catalog.h"
+#include "common/relpath.h"
 #include "storage/copydir.h"
 #include "storage/fd.h"
 #include "storage/reinit.h"

src/backend/storage/smgr/md.c

@@ -21,6 +21,7 @@
 #include "miscadmin.h"
 #include "access/xlog.h"
 #include "catalog/catalog.h"
+#include "common/relpath.h"
 #include "portability/instr_time.h"
 #include "postmaster/bgwriter.h"
 #include "storage/fd.h"

src/backend/utils/adt/dbsize.c

@@ -21,6 +21,7 @@
 #include "catalog/pg_tablespace.h"
 #include "commands/dbcommands.h"
 #include "commands/tablespace.h"
+#include "common/relpath.h"
 #include "miscadmin.h"
 #include "storage/fd.h"
 #include "utils/acl.h"

src/backend/utils/adt/misc.c

@@ -24,6 +24,7 @@
 #include "catalog/pg_tablespace.h"
 #include "catalog/pg_type.h"
 #include "commands/dbcommands.h"
+#include "common/relpath.h"
 #include "funcapi.h"
 #include "miscadmin.h"
 #include "parser/keywords.h"

src/backend/utils/cache/relcache.c

@@ -56,6 +56,7 @@
 #include "catalog/schemapg.h"
 #include "catalog/storage.h"
 #include "commands/trigger.h"
+#include "common/relpath.h"
 #include "miscadmin.h"
 #include "optimizer/clauses.h"
 #include "optimizer/planmain.h"

src/common/Makefile

@@ -23,13 +23,13 @@ include $(top_builddir)/src/Makefile.global
 override CPPFLAGS := -DFRONTEND $(CPPFLAGS)
 LIBS += $(PTHREAD_LIBS)
 
-OBJS_COMMON =
+OBJS_COMMON = relpath.o
 
 OBJS_FRONTEND = $(OBJS_COMMON) fe_memutils.o
 
 OBJS_SRV = $(OBJS_COMMON:%.o=%_srv.o)
 
-all: libpgcommon.a
+all: libpgcommon.a libpgcommon_srv.a
 
 # libpgcommon is needed by some contrib
 install: all installdirs
@@ -60,5 +60,12 @@ libpgcommon_srv.a: $(OBJS_SRV)
 %_srv.o: %.c %.o
 	$(CC) $(CFLAGS) $(subst -DFRONTEND,, $(CPPFLAGS)) -c $< -o $@
 
+$(OBJS_SRV): | submake-errcodes
+
+.PHONY: submake-errcodes
+
+submake-errcodes:
+	$(MAKE) -C ../backend submake-errcodes
+
 clean distclean maintainer-clean:
 	rm -f libpgcommon.a libpgcommon_srv.a $(OBJS_FRONTEND) $(OBJS_SRV)

src/common/relpath.c

@@ -0,0 +1,162 @@
+/*-------------------------------------------------------------------------
+ * relpath.c
+ * 		Shared frontend/backend code to find out pathnames of relation files
+ *
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * IDENTIFICATION
+ *    src/common/relpath.c
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef FRONTEND
+#include "postgres.h"
+#else
+#include "postgres_fe.h"
+#endif
+
+#include "catalog/pg_tablespace.h"
+#include "common/relpath.h"
+#include "storage/backendid.h"
+
+#define FORKNAMECHARS	4		/* max chars for a fork name */
+
+/*
+ * Lookup table of fork name by fork number.
+ *
+ * If you add a new entry, remember to update the errhint below, and the
+ * documentation for pg_relation_size(). Also keep FORKNAMECHARS above
+ * up-to-date.
+ */
+const char *forkNames[] = {
+	"main",						/* MAIN_FORKNUM */
+	"fsm",						/* FSM_FORKNUM */
+	"vm",						/* VISIBILITYMAP_FORKNUM */
+	"init"						/* INIT_FORKNUM */
+};
+
+/*
+ * forkname_chars
+ *		We use this to figure out whether a filename could be a relation
+ *		fork (as opposed to an oddly named stray file that somehow ended
+ *		up in the database directory).	If the passed string begins with
+ *		a fork name (other than the main fork name), we return its length,
+ *		and set *fork (if not NULL) to the fork number.  If not, we return 0.
+ *
+ * Note that the present coding assumes that there are no fork names which
+ * are prefixes of other fork names.
+ */
+int
+forkname_chars(const char *str, ForkNumber *fork)
+{
+	ForkNumber	forkNum;
+
+	for (forkNum = 1; forkNum <= MAX_FORKNUM; forkNum++)
+	{
+		int			len = strlen(forkNames[forkNum]);
+
+		if (strncmp(forkNames[forkNum], str, len) == 0)
+		{
+			if (fork)
+				*fork = forkNum;
+			return len;
+		}
+	}
+	return 0;
+}
+
+/*
+ * relpathbackend - construct path to a relation's file
+ *
+ * Result is a palloc'd string.
+ */
+char *
+relpathbackend(RelFileNode rnode, BackendId backend, ForkNumber forknum)
+{
+	int			pathlen;
+	char	   *path;
+
+	if (rnode.spcNode == GLOBALTABLESPACE_OID)
+	{
+		/* Shared system relations live in {datadir}/global */
+		Assert(rnode.dbNode == 0);
+		Assert(backend == InvalidBackendId);
+		pathlen = 7 + OIDCHARS + 1 + FORKNAMECHARS + 1;
+		path = (char *) palloc(pathlen);
+		if (forknum != MAIN_FORKNUM)
+			snprintf(path, pathlen, "global/%u_%s",
+					 rnode.relNode, forkNames[forknum]);
+		else
+			snprintf(path, pathlen, "global/%u", rnode.relNode);
+	}
+	else if (rnode.spcNode == DEFAULTTABLESPACE_OID)
+	{
+		/* The default tablespace is {datadir}/base */
+		if (backend == InvalidBackendId)
+		{
+			pathlen = 5 + OIDCHARS + 1 + OIDCHARS + 1 + FORKNAMECHARS + 1;
+			path = (char *) palloc(pathlen);
+			if (forknum != MAIN_FORKNUM)
+				snprintf(path, pathlen, "base/%u/%u_%s",
+						 rnode.dbNode, rnode.relNode,
+						 forkNames[forknum]);
+			else
+				snprintf(path, pathlen, "base/%u/%u",
+						 rnode.dbNode, rnode.relNode);
+		}
+		else
+		{
+			/* OIDCHARS will suffice for an integer, too */
+			pathlen = 5 + OIDCHARS + 2 + OIDCHARS + 1 + OIDCHARS + 1
+				+ FORKNAMECHARS + 1;
+			path = (char *) palloc(pathlen);
+			if (forknum != MAIN_FORKNUM)
+				snprintf(path, pathlen, "base/%u/t%d_%u_%s",
+						 rnode.dbNode, backend, rnode.relNode,
+						 forkNames[forknum]);
+			else
+				snprintf(path, pathlen, "base/%u/t%d_%u",
+						 rnode.dbNode, backend, rnode.relNode);
+		}
+	}
+	else
+	{
+		/* All other tablespaces are accessed via symlinks */
+		if (backend == InvalidBackendId)
+		{
+			pathlen = 9 + 1 + OIDCHARS + 1
+				+ strlen(TABLESPACE_VERSION_DIRECTORY) + 1 + OIDCHARS + 1
+				+ OIDCHARS + 1 + FORKNAMECHARS + 1;
+			path = (char *) palloc(pathlen);
+			if (forknum != MAIN_FORKNUM)
+				snprintf(path, pathlen, "pg_tblspc/%u/%s/%u/%u_%s",
+						 rnode.spcNode, TABLESPACE_VERSION_DIRECTORY,
+						 rnode.dbNode, rnode.relNode,
+						 forkNames[forknum]);
+			else
+				snprintf(path, pathlen, "pg_tblspc/%u/%s/%u/%u",
+						 rnode.spcNode, TABLESPACE_VERSION_DIRECTORY,
+						 rnode.dbNode, rnode.relNode);
+		}
+		else
+		{
+			/* OIDCHARS will suffice for an integer, too */
+			pathlen = 9 + 1 + OIDCHARS + 1
+				+ strlen(TABLESPACE_VERSION_DIRECTORY) + 1 + OIDCHARS + 2
+				+ OIDCHARS + 1 + OIDCHARS + 1 + FORKNAMECHARS + 1;
+			path = (char *) palloc(pathlen);
+			if (forknum != MAIN_FORKNUM)
+				snprintf(path, pathlen, "pg_tblspc/%u/%s/%u/t%d_%u_%s",
+						 rnode.spcNode, TABLESPACE_VERSION_DIRECTORY,
+						 rnode.dbNode, backend, rnode.relNode,
+						 forkNames[forknum]);
+			else
+				snprintf(path, pathlen, "pg_tblspc/%u/%s/%u/t%d_%u",
+						 rnode.spcNode, TABLESPACE_VERSION_DIRECTORY,
+						 rnode.dbNode, backend, rnode.relNode);
+		}
+	}
+	return path;
+}
+

src/include/catalog/catalog.h

@@ -14,34 +14,14 @@
 #ifndef CATALOG_H
 #define CATALOG_H
 
-/*
- *	'pgrminclude ignore' needed here because CppAsString2() does not throw
- *	an error if the symbol is not defined.
- */
-#include "catalog/catversion.h" /* pgrminclude ignore */
 #include "catalog/pg_class.h"
 #include "storage/relfilenode.h"
 #include "utils/relcache.h"
 
-#define OIDCHARS		10		/* max chars printed by %u */
-#define TABLESPACE_VERSION_DIRECTORY	"PG_" PG_MAJORVERSION "_" \
-									CppAsString2(CATALOG_VERSION_NO)
-
-extern const char *forkNames[];
 extern ForkNumber forkname_to_number(char *forkName);
-extern int	forkname_chars(const char *str, ForkNumber *);
 
-extern char *relpathbackend(RelFileNode rnode, BackendId backend,
-			   ForkNumber forknum);
 extern char *GetDatabasePath(Oid dbNode, Oid spcNode);
 
-/* First argument is a RelFileNodeBackend */
-#define relpath(rnode, forknum) \
-		relpathbackend((rnode).node, (rnode).backend, (forknum))
-
-/* First argument is a RelFileNode */
-#define relpathperm(rnode, forknum) \
-		relpathbackend((rnode), InvalidBackendId, (forknum))
 
 extern bool IsSystemRelation(Relation relation);
 extern bool IsToastRelation(Relation relation);

src/include/common/relpath.h

@@ -0,0 +1,41 @@
+/*-------------------------------------------------------------------------
+ *
+ * relpath.h
+ * 		Declarations for relpath() and friends
+ *
+ * Portions Copyright (c) 1996-2013, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/common/relpath.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef RELPATH_H
+#define RELPATH_H
+
+/*
+ *	'pgrminclude ignore' needed here because CppAsString2() does not throw
+ *	an error if the symbol is not defined.
+ */
+#include "catalog/catversion.h" /* pgrminclude ignore */
+#include "storage/relfilenode.h"
+
+
+#define OIDCHARS		10		/* max chars printed by %u */
+#define TABLESPACE_VERSION_DIRECTORY	"PG_" PG_MAJORVERSION "_" \
+									CppAsString2(CATALOG_VERSION_NO)
+
+extern const char *forkNames[];
+extern int	forkname_chars(const char *str, ForkNumber *fork);
+extern char *relpathbackend(RelFileNode rnode, BackendId backend,
+			   ForkNumber forknum);
+
+/* First argument is a RelFileNodeBackend */
+#define relpath(rnode, forknum) \
+		relpathbackend((rnode).node, (rnode).backend, (forknum))
+
+/* First argument is a RelFileNode */
+#define relpathperm(rnode, forknum) \
+		relpathbackend((rnode), InvalidBackendId, (forknum))
+
+#endif		/* RELPATH_H */

src/tools/msvc/Mkvcbuild.pm

@@ -69,10 +69,13 @@ sub mkvcbuild
 	  sprompt.c tar.c thread.c getopt.c getopt_long.c dirent.c rint.c win32env.c
 	  win32error.c win32setlocale.c);
 
-	our @pgcommonfiles = qw(
-		fe_memutils.c);
+	our @pgcommonallfiles = qw(
+		relpath.c);
 
-	our @pgcommonbkndfiles = qw();
+	our @pgcommonfrontendfiles = (@pgcommonallfiles,
+		qw(fe_memutils.c));
+
+	our @pgcommonbkndfiles = @pgcommonallfiles;
 
 	$libpgport = $solution->AddProject('libpgport', 'lib', 'misc');
 	$libpgport->AddDefine('FRONTEND');
@@ -80,7 +83,7 @@ sub mkvcbuild
 
 	$libpgcommon = $solution->AddProject('libpgcommon', 'lib', 'misc');
 	$libpgcommon->AddDefine('FRONTEND');
-	$libpgcommon->AddFiles('src\common', @pgcommonfiles);
+	$libpgcommon->AddFiles('src\common', @pgcommonfrontendfiles);
 
 	$postgres = $solution->AddProject('postgres', 'exe', '', 'src\backend');
 	$postgres->AddIncludeDir('src\backend');