buf_page_get_gen(): Allow BUF_GET_IF_IN_POOL with a dummy page_size

The page_size argument to buf_page_get_gen() only matters when the
page is going to be loaded into the buffer pool. Allow callers to
pass a dummy parameter when using BUF_GET_IF_IN_POOL (which would
return NULL if the block is not in the buffer pool).

storage/innobase/btr/btr0bulk.cc

 /*****************************************************************************
 
 Copyright (c) 2014, 2016, Oracle and/or its affiliates. All Rights Reserved.
-Copyright (c) 2017, 2018, MariaDB Corporation.
+Copyright (c) 2017, 2019, MariaDB Corporation.
 
 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
@@ -664,10 +664,9 @@ PageBulk::latch()
 	/* In case the block is S-latched by page_cleaner. */
 	if (!buf_page_optimistic_get(RW_X_LATCH, m_block, m_modify_clock,
 				     __FILE__, __LINE__, &m_mtr)) {
-		page_id_t       page_id(dict_index_get_space(m_index), m_page_no);
-		page_size_t     page_size(dict_table_page_size(m_index->table));
-
-		m_block = buf_page_get_gen(page_id, page_size, RW_X_LATCH,
+		m_block = buf_page_get_gen(page_id_t(m_index->space,
+						     m_page_no),
+					   univ_page_size, RW_X_LATCH,
 					   m_block, BUF_GET_IF_IN_POOL,
 					   __FILE__, __LINE__, &m_mtr, &m_err);
 

storage/innobase/buf/buf0buf.cc

@@ -4211,12 +4211,15 @@ buf_page_get_gen(
 #ifdef UNIV_DEBUG
 	switch (mode) {
 	case BUF_EVICT_IF_IN_POOL:
-	case BUF_PEEK_IF_IN_POOL:
 		/* After DISCARD TABLESPACE, the tablespace would not exist,
 		but in IMPORT TABLESPACE, PageConverter::operator() must
 		replace any old pages, which were not evicted during DISCARD.
-		Similarly, btr_search_drop_page_hash_when_freed() must
-		remove any old pages. Skip the assertion on page_size. */
+		Skip the assertion on space_page_size. */
+		break;
+	case BUF_PEEK_IF_IN_POOL:
+	case BUF_GET_IF_IN_POOL:
+		/* The caller may pass a dummy page size,
+		because it does not really matter. */
 		break;
 	default:
 		ut_error;
@@ -4224,7 +4227,6 @@ buf_page_get_gen(
 		ut_ad(rw_latch == RW_NO_LATCH);
 		/* fall through */
 	case BUF_GET:
-	case BUF_GET_IF_IN_POOL:
 	case BUF_GET_IF_IN_POOL_OR_WATCH:
 	case BUF_GET_POSSIBLY_FREED:
 		bool			found;

storage/innobase/log/log0recv.cc

@@ -2263,33 +2263,23 @@ void recv_apply_hashed_log_recs(bool last_batch)
 
 			const page_id_t page_id(recv_addr->space,
 						recv_addr->page_no);
-			bool			found;
-			const page_size_t&	page_size
-				= fil_space_get_page_size(recv_addr->space,
-							  &found);
-
-			ut_ad(found);
 
 			if (recv_addr->state == RECV_NOT_PROCESSED) {
 				mutex_exit(&recv_sys->mutex);
-
-				if (buf_page_peek(page_id)) {
 				mtr_t mtr;
 				mtr.start();
-
-					buf_block_t* block = buf_page_get(
-						page_id, page_size,
-						RW_X_LATCH, &mtr);
-
+				if (buf_block_t* block = buf_page_get_gen(
+					    page_id, univ_page_size,
+					    RW_X_LATCH, NULL,
+					    BUF_GET_IF_IN_POOL,
+					    __FILE__, __LINE__, &mtr, NULL)) {
 					buf_block_dbg_add_level(
 						block, SYNC_NO_ORDER_CHECK);
-
 					recv_recover_page(FALSE, block);
-					mtr.commit();
 				} else {
 					recv_read_in_area(page_id);
 				}
-
+				mtr.commit();
 				mutex_enter(&recv_sys->mutex);
 			}
 		}