v20240805-0002-use-GetFakeLSNForUnloggedRel.patch

From 92401b291bfd87a2b7db6de53fbc9d9689916039 Mon Sep 17 00:00:00 2001
From: Tomas Vondra <tomas@vondra.me>
Date: Mon, 29 Jul 2024 18:03:44 +0200
Subject: [PATCH v20240805 2/6] use GetFakeLSNForUnloggedRel

---
 src/backend/access/gist/gist.c       | 10 +++++-----
 src/backend/access/gist/gistutil.c   | 10 +++-------
 src/backend/access/gist/gistvacuum.c |  6 +++---
 src/include/access/gist_private.h    |  2 +-
 4 files changed, 12 insertions(+), 16 deletions(-)

diff --git a/src/backend/access/gist/gist.c b/src/backend/access/gist/gist.c
index f5f56fb2503..21c87c8c12f 100644
--- a/src/backend/access/gist/gist.c
+++ b/src/backend/access/gist/gist.c
@@ -509,7 +509,7 @@ gistplacetopage(Relation rel, Size freespace, GISTSTATE *giststate,
 		if (is_build)
 		{
 			if (is_parallel)
-				recptr = gistGetFakeLSN(rel, is_parallel);
+				recptr = GetFakeLSNForUnloggedRel();
 			else
 				recptr = GistBuildLSN;
 		}
@@ -520,7 +520,7 @@ gistplacetopage(Relation rel, Size freespace, GISTSTATE *giststate,
 									   dist, oldrlink, oldnsn, leftchildbuf,
 									   markfollowright);
 			else
-				recptr = gistGetFakeLSN(rel, false);
+				recptr = gistGetFakeLSN(rel);
 		}
 
 		for (ptr = dist; ptr; ptr = ptr->next)
@@ -581,7 +581,7 @@ gistplacetopage(Relation rel, Size freespace, GISTSTATE *giststate,
 		if (is_build)
 		{
 			if (is_parallel)
-				recptr = gistGetFakeLSN(rel, is_parallel);
+				recptr = GetFakeLSNForUnloggedRel();
 			else
 				recptr = GistBuildLSN;
 		}
@@ -603,7 +603,7 @@ gistplacetopage(Relation rel, Size freespace, GISTSTATE *giststate,
 										leftchildbuf);
 			}
 			else
-				recptr = gistGetFakeLSN(rel, false);
+				recptr = gistGetFakeLSN(rel);
 		}
 		PageSetLSN(page, recptr);
 
@@ -1739,7 +1739,7 @@ gistprunepage(Relation rel, Page page, Buffer buffer, Relation heapRel)
 			PageSetLSN(page, recptr);
 		}
 		else
-			PageSetLSN(page, gistGetFakeLSN(rel, false));
+			PageSetLSN(page, gistGetFakeLSN(rel));
 
 		END_CRIT_SECTION();
 	}
diff --git a/src/backend/access/gist/gistutil.c b/src/backend/access/gist/gistutil.c
index 733d5849317..78e98d68b15 100644
--- a/src/backend/access/gist/gistutil.c
+++ b/src/backend/access/gist/gistutil.c
@@ -1012,7 +1012,7 @@ gistproperty(Oid index_oid, int attno,
  * purpose.
  */
 XLogRecPtr
-gistGetFakeLSN(Relation rel, bool is_parallel)
+gistGetFakeLSN(Relation rel)
 {
 	if (rel->rd_rel->relpersistence == RELPERSISTENCE_TEMP)
 	{
@@ -1035,12 +1035,8 @@ gistGetFakeLSN(Relation rel, bool is_parallel)
 		static XLogRecPtr lastlsn = InvalidXLogRecPtr;
 		XLogRecPtr	currlsn = GetXLogInsertRecPtr();
 
-		/*
-		 * Shouldn't be called for WAL-logging relations, but parallell
-		 * builds are an exception - we need the fake LSN to detect
-		 * concurrent changes.
-		 */
-		Assert(is_parallel || !RelationNeedsWAL(rel));
+		/* Shouldn't be called for WAL-logging relations */
+		Assert(!RelationNeedsWAL(rel));
 
 		/* No need for an actual record if we already have a distinct LSN */
 		if (!XLogRecPtrIsInvalid(lastlsn) && lastlsn == currlsn)
diff --git a/src/backend/access/gist/gistvacuum.c b/src/backend/access/gist/gistvacuum.c
index 082804e9c7d..24fb94f473e 100644
--- a/src/backend/access/gist/gistvacuum.c
+++ b/src/backend/access/gist/gistvacuum.c
@@ -181,7 +181,7 @@ gistvacuumscan(IndexVacuumInfo *info, IndexBulkDeleteResult *stats,
 	if (RelationNeedsWAL(rel))
 		vstate.startNSN = GetInsertRecPtr();
 	else
-		vstate.startNSN = gistGetFakeLSN(rel, false);
+		vstate.startNSN = gistGetFakeLSN(rel);
 
 	/*
 	 * The outer loop iterates over all index pages, in physical order (we
@@ -376,7 +376,7 @@ restart:
 				PageSetLSN(page, recptr);
 			}
 			else
-				PageSetLSN(page, gistGetFakeLSN(rel, false));
+				PageSetLSN(page, gistGetFakeLSN(rel));
 
 			END_CRIT_SECTION();
 
@@ -664,7 +664,7 @@ gistdeletepage(IndexVacuumInfo *info, IndexBulkDeleteResult *stats,
 	if (RelationNeedsWAL(info->index))
 		recptr = gistXLogPageDelete(leafBuffer, txid, parentBuffer, downlink);
 	else
-		recptr = gistGetFakeLSN(info->index, false);
+		recptr = gistGetFakeLSN(info->index);
 	PageSetLSN(parentPage, recptr);
 	PageSetLSN(leafPage, recptr);
 
diff --git a/src/include/access/gist_private.h b/src/include/access/gist_private.h
index d5b22bc1018..1aeb35cdcb7 100644
--- a/src/include/access/gist_private.h
+++ b/src/include/access/gist_private.h
@@ -535,7 +535,7 @@ extern void gistMakeUnionKey(GISTSTATE *giststate, int attno,
 							 GISTENTRY *entry2, bool isnull2,
 							 Datum *dst, bool *dstisnull);
 
-extern XLogRecPtr gistGetFakeLSN(Relation rel, bool is_parallel);
+extern XLogRecPtr gistGetFakeLSN(Relation rel);
 
 /* gistvacuum.c */
 extern IndexBulkDeleteResult *gistbulkdelete(IndexVacuumInfo *info,
-- 
2.45.2