MDEV-18115: Remove OS_AIO_LOG and IORequest::LOG

storage/innobase/fil/fil0fil.cc

@@ -3993,19 +3993,12 @@ fil_io(
 	ut_ad(recv_no_ibuf_operations
 	      || req_type.is_write()
 	      || !ibuf_bitmap_page(page_id, zip_size)
-	      || sync
-	      || req_type.is_log());
+	      || sync);
 
 	ulint	mode;
 
 	if (sync) {
-
 		mode = OS_AIO_SYNC;
-
-	} else if (req_type.is_log()) {
-
-		mode = OS_AIO_LOG;
-
 	} else if (req_type.is_read()
 		   && !recv_no_ibuf_operations
 		   && ibuf_page(page_id, zip_size, NULL)) {

storage/innobase/include/os0file.h

@@ -2,7 +2,7 @@
 
 Copyright (c) 1995, 2017, Oracle and/or its affiliates. All Rights Reserved.
 Copyright (c) 2009, Percona Inc.
-Copyright (c) 2013, 2019, MariaDB Corporation.
+Copyright (c) 2013, 2020, MariaDB Corporation.
 
 Portions of this file contain modifications contributed and copyrighted
 by Percona Inc.. Those modifications are
@@ -187,10 +187,6 @@ static const ulint OS_FILE_ERROR_MAX = 200;
 /** No transformations during read/write, write as is. */
 #define IORequestRead		IORequest(IORequest::READ)
 #define IORequestWrite		IORequest(IORequest::WRITE)
-#define IORequestLogRead	IORequest(IORequest::LOG | IORequest::READ)
-#define IORequestLogWrite	IORequest(IORequest::LOG | IORequest::WRITE)
-
-
 
 /**
 The IO Context that is passed down to the low level IO code */
@@ -209,9 +205,6 @@ class IORequest {
 		/** Data file */
 		DATA_FILE = 8,
 
-		/** Log file request*/
-		LOG = 16,
-
 		/** Disable partial read warnings */
 		DISABLE_PARTIAL_IO_WARNINGS = 32,
 
@@ -279,13 +272,6 @@ class IORequest {
 		return((m_type & WRITE) == WRITE);
 	}
 
-	/** @return true if it is a redo log write */
-	bool is_log() const
-		MY_ATTRIBUTE((warn_unused_result))
-	{
-		return((m_type & LOG) == LOG);
-	}
-
 	/** Clear the punch hole flag */
 	void clear_punch_hole()
 	{
@@ -417,9 +403,6 @@ static const ulint OS_AIO_NORMAL = 21;
 /**  Asynchronous i/o for ibuf pages or ibuf bitmap pages */
 static const ulint OS_AIO_IBUF = 22;
 
-/** Asynchronous i/o for the log */
-static const ulint OS_AIO_LOG = 23;
-
 /**Calling thread will wait for the i/o to complete,
 and perform IO completion routine itself;
 can be used for any pages, ibuf or non-ibuf.  This is used to save

storage/innobase/os/os0file.cc

@@ -3138,7 +3138,6 @@ os_file_io(
 			bytes_returned += n_bytes;
 
 			if (offset > 0
-			    && !type.is_log()
 			    && type.is_write()
 			    && type.punch_hole()) {
 				*err = type.punch_hole(file, offset, n);