Move vacuumlazy.c into access/heap.

It's heap table storage specific code that can't realistically be
generalized into table AM agnostic code.

Author: Andres Freund
Discussion: https://postgr.es/m/20180703070645.wchpu5muyto5n647@alap3.anarazel.de

src/backend/access/heap/Makefile

@@ -12,6 +12,7 @@ subdir = src/backend/access/heap
 top_builddir = ../../../..
 include $(top_builddir)/src/Makefile.global
 
-OBJS = heapam.o hio.o pruneheap.o rewriteheap.o syncscan.o tuptoaster.o visibilitymap.o
+OBJS = heapam.o hio.o pruneheap.o rewriteheap.o syncscan.o tuptoaster.o \
+	vacuumlazy.o visibilitymap.o
 
 include $(top_srcdir)/src/backend/common.mk

src/backend/commands/vacuumlazy.c → src/backend/access/heap/vacuumlazy.c

@@ -28,7 +28,7 @@
  *
  *
  * IDENTIFICATION
- *	  src/backend/commands/vacuumlazy.c
+ *	  src/backend/access/heap/vacuumlazy.c
  *
  *-------------------------------------------------------------------------
  */
@@ -178,7 +178,7 @@ static bool heap_page_is_all_visible(Relation rel, Buffer buf,
 
 
 /*
- *	lazy_vacuum_rel() -- perform LAZY VACUUM for one heap relation
+ *	vacuum_heap_rel() -- perform VACUUM for one heap relation
  *
  *		This routine vacuums a single heap, cleans out its indexes, and
  *		updates its relpages and reltuples statistics.
@@ -187,7 +187,7 @@ static bool heap_page_is_all_visible(Relation rel, Buffer buf,
  *		and locked the relation.
  */
 void
-lazy_vacuum_rel(Relation onerel, int options, VacuumParams *params,
+heap_vacuum_rel(Relation onerel, int options, VacuumParams *params,
 				BufferAccessStrategy bstrategy)
 {
 	LVRelStats *vacrelstats;

src/backend/commands/Makefile

@@ -20,6 +20,6 @@ OBJS = amcmds.o aggregatecmds.o alter.o analyze.o async.o cluster.o comment.o \
 	policy.o portalcmds.o prepare.o proclang.o publicationcmds.o \
 	schemacmds.o seclabel.o sequence.o statscmds.o subscriptioncmds.o \
 	tablecmds.o tablespace.o trigger.o tsearchcmds.o typecmds.o user.o \
-	vacuum.o vacuumlazy.o variable.o view.o
+	vacuum.o variable.o view.o
 
 include $(top_srcdir)/src/backend/common.mk

src/backend/commands/vacuum.c

@@ -1711,7 +1711,7 @@ vacuum_rel(Oid relid, RangeVar *relation, int options, VacuumParams *params)
 		cluster_rel(relid, InvalidOid, cluster_options);
 	}
 	else
-		lazy_vacuum_rel(onerel, options, params, vac_strategy);
+		heap_vacuum_rel(onerel, options, params, vac_strategy);
 
 	/* Roll back any GUC changes executed by index functions */
 	AtEOXact_GUC(false, save_nestlevel);

src/include/access/heapam.h

@@ -186,4 +186,8 @@ extern BlockNumber ss_get_location(Relation rel, BlockNumber relnblocks);
 extern void SyncScanShmemInit(void);
 extern Size SyncScanShmemSize(void);
 
+/* in heap/vacuumlazy.c */
+struct VacuumParams;
+extern void heap_vacuum_rel(Relation onerel, int options,
+				struct VacuumParams *params, BufferAccessStrategy bstrategy);
 #endif							/* HEAPAM_H */

src/include/commands/vacuum.h

@@ -196,10 +196,6 @@ extern bool vacuum_is_relation_owner(Oid relid, Form_pg_class reltuple,
 extern Relation vacuum_open_relation(Oid relid, RangeVar *relation,
 					 VacuumParams *params, int options, LOCKMODE lmode);
 
-/* in commands/vacuumlazy.c */
-extern void lazy_vacuum_rel(Relation onerel, int options,
-				VacuumParams *params, BufferAccessStrategy bstrategy);
-
 /* in commands/analyze.c */
 extern void analyze_rel(Oid relid, RangeVar *relation, int options,
 			VacuumParams *params, List *va_cols, bool in_outer_xact,