Function FileSetIsWorkfile

src/backend/storage/file/fd.c:3860–3864

* Mark the file as a "work file" that should be tracked by the workfile manager. */

 * Mark the file as a "work file" that should be tracked by the workfile manager.
 */
void
FileSetIsWorkfile(File file)
{
	VfdCache[file].fdstate |= FD_WORKFILE;
}

/*
 * Create a PostgreSQL data sub-directory