Use 64 bit type for BufFileSize().

BufFileSize() can't use off_t, because it's only 32 bits wide on
some systems.  BufFile objects can have many 1GB segments so the
total size can exceed 2^31.  The only known client of the function
is parallel CREATE INDEX, which was reported to fail when building
large indexes on Windows.

Though this is technically an ABI break on platforms with a 32 bit
off_t and we might normally avoid back-patching it, the function is
brand new and thus unlikely to have been discovered by extension
authors yet, and it's fairly thoroughly broken on those platforms
anyway, so just fix it.

Defect in 9da0cc35.  Bug #15460.  Back-patch to 11, where this
function landed.

Author: Thomas Munro
Reported-by: Paul van der Linden, Pavel Oskin
Reviewed-by: Peter Geoghegan
Discussion: https://postgr.es/m/15460-b6db80de822fa0ad%40postgresql.org
Discussion: https://postgr.es/m/CAHDGBJP_GsESbTt4P3FZA8kMUKuYxjg57XHF7NRBoKnR%3DCAR-g%40mail.gmail.com

src/backend/storage/file/buffile.c

@@ -768,17 +768,17 @@ BufFileTellBlock(BufFile *file)
  * Counts any holes left behind by BufFileAppend as part of the size.
  * Returns -1 on error.
  */
-off_t
+int64
 BufFileSize(BufFile *file)
 {
-	off_t		lastFileSize;
+	int64		lastFileSize;
 
 	/* Get the size of the last physical file. */
 	lastFileSize = FileSize(file->files[file->numFiles - 1]);
 	if (lastFileSize < 0)
 		return -1;
 
-	return ((file->numFiles - 1) * (off_t) MAX_PHYSICAL_FILESIZE) +
+	return ((file->numFiles - 1) * (int64) MAX_PHYSICAL_FILESIZE) +
 		lastFileSize;
 }
 

src/backend/utils/sort/logtape.c

@@ -426,7 +426,7 @@ ltsConcatWorkerTapes(LogicalTapeSet *lts, TapeShare *shared,
 	{
 		char		filename[MAXPGPATH];
 		BufFile    *file;
-		off_t		filesize;
+		int64		filesize;
 
 		lt = &lts->tapes[i];
 

src/include/storage/buffile.h

@@ -43,7 +43,7 @@ extern size_t BufFileWrite(BufFile *file, void *ptr, size_t size);
 extern int	BufFileSeek(BufFile *file, int fileno, off_t offset, int whence);
 extern void BufFileTell(BufFile *file, int *fileno, off_t *offset);
 extern int	BufFileSeekBlock(BufFile *file, long blknum);
-extern off_t BufFileSize(BufFile *file);
+extern int64 BufFileSize(BufFile *file);
 extern long BufFileAppend(BufFile *target, BufFile *source);
 
 extern BufFile *BufFileCreateShared(SharedFileSet *fileset, const char *name);