MDEV-21225 Remove ut_align() and use aligned_malloc()

Before commit 90c52e5291b3ad0935df7da56ec0fcbf530733b4 introduced
aligned_malloc(), InnoDB always used a pattern of over-allocating
memory and invoking ut_align() to guarantee the desired alignment.

It is cleaner to invoke aligned_malloc() and aligned_free() directly.

ut_align(): Remove. In assertions, ut_align_down() can be used instead.

4 files changed, 17 insertions, 28 deletions

diff --git a/extra/mariabackup/backup_copy.cc b/extra/mariabackup/backup_copy.cc
index 6ede0288e3a..ed977931423 100644
--- a/extra/mariabackup/backup_copy.cc
+++ b/extra/mariabackup/backup_copy.cc
@@ -466,14 +466,13 @@ struct datafile_cur_t {
 	char		abs_path[FN_REFLEN];
 	MY_STAT		statinfo;
 	uint		thread_n;
-	byte*		orig_buf;
 	byte*		buf;
 	size_t		buf_size;
 	size_t		buf_read;
 	size_t		buf_offset;
 
 	explicit datafile_cur_t(const char* filename = NULL) :
-		file(), thread_n(0), orig_buf(NULL), buf(NULL), buf_size(0),
+		file(), thread_n(0), buf(NULL), buf_size(0),
 		buf_read(0), buf_offset(0)
 	{
 		memset(rel_path, 0, sizeof rel_path);
diff --git a/extra/mariabackup/fil_cur.cc b/extra/mariabackup/fil_cur.cc
index 453aab802c9..d1b2275a845 100644
--- a/extra/mariabackup/fil_cur.cc
+++ b/extra/mariabackup/fil_cur.cc
@@ -142,7 +142,7 @@ xb_fil_cur_open(
 	int err;
 	/* Initialize these first so xb_fil_cur_close() handles them correctly
 	in case of error */
-	cursor->orig_buf = NULL;
+	cursor->buf = NULL;
 	cursor->node = NULL;
 
 	cursor->space_id = node->space->id;
@@ -238,10 +238,8 @@ xb_fil_cur_open(
 
 	/* Allocate read buffer */
 	cursor->buf_size = XB_FIL_CUR_PAGES * cursor->page_size;
-	cursor->orig_buf = static_cast<byte *>
-		(malloc(cursor->buf_size + srv_page_size));
-	cursor->buf = static_cast<byte *>
-		(ut_align(cursor->orig_buf, srv_page_size));
+	cursor->buf = static_cast<byte*>(aligned_malloc(cursor->buf_size,
+							srv_page_size));
 
 	cursor->buf_read = 0;
 	cursor->buf_npages = 0;
@@ -494,7 +492,8 @@ xb_fil_cur_close(
 		cursor->read_filter->deinit(&cursor->read_filter_ctxt);
 	}
 
-	free(cursor->orig_buf);
+	aligned_free(cursor->buf);
+	cursor->buf = NULL;
 
 	if (cursor->node != NULL) {
 		xb_fil_node_close_file(cursor->node);
diff --git a/extra/mariabackup/fil_cur.h b/extra/mariabackup/fil_cur.h
index b789efde05f..70e4888ba63 100644
--- a/extra/mariabackup/fil_cur.h
+++ b/extra/mariabackup/fil_cur.h
@@ -44,8 +44,7 @@ struct xb_fil_cur_t {
 	xb_read_filt_t*	read_filter;	/*!< read filter */
 	xb_read_filt_ctxt_t	read_filter_ctxt;
 					/*!< read filter context */
-	byte*		orig_buf;	/*!< read buffer */
-	byte*		buf;		/*!< aligned pointer for orig_buf */
+	byte*		buf;		/*!< read buffer */
 	size_t		buf_size;	/*!< buffer size in bytes */
 	size_t		buf_read;	/*!< number of read bytes in buffer
 					after the last cursor read */
diff --git a/extra/mariabackup/xtrabackup.cc b/extra/mariabackup/xtrabackup.cc
index 03a82bfc58b..c53c9037bda 100644
--- a/extra/mariabackup/xtrabackup.cc
+++ b/extra/mariabackup/xtrabackup.cc
@@ -3269,8 +3269,6 @@ static dberr_t xb_assign_undo_space_start()
 {
 
 	pfs_os_file_t	file;
-	byte*		buf;
-	byte*		page;
 	bool		ret;
 	dberr_t		error = DB_SUCCESS;
 	ulint		space;
@@ -3289,8 +3287,8 @@ static dberr_t xb_assign_undo_space_start()
 		return DB_ERROR;
 	}
 
-	buf = static_cast<byte*>(ut_malloc_nokey(2U << srv_page_size_shift));
-	page = static_cast<byte*>(ut_align(buf, srv_page_size));
+	byte* page = static_cast<byte*>
+		(aligned_malloc(srv_page_size, srv_page_size));
 
 	if (os_file_read(IORequestRead, file, page, 0, srv_page_size)
 	    != DB_SUCCESS) {
@@ -3337,7 +3335,7 @@ retry:
 	srv_undo_space_id_start = space;
 
 func_exit:
-	ut_free(buf);
+	aligned_free(page);
 	ret = os_file_close(file);
 	ut_a(ret);
 
@@ -4552,8 +4550,6 @@ xb_space_create_file(
 	pfs_os_file_t*	file)		/*!<out: file handle */
 {
 	bool		ret;
-	byte*		buf;
-	byte*		page;
 
 	*file = os_file_create_simple_no_error_handling(
 		0, path, OS_FILE_CREATE, OS_FILE_READ_WRITE, false, &ret);
@@ -4572,9 +4568,9 @@ xb_space_create_file(
 		return ret;
 	}
 
-	buf = static_cast<byte *>(malloc(3U << srv_page_size_shift));
 	/* Align the memory for file i/o if we might have O_DIRECT set */
-	page = static_cast<byte *>(ut_align(buf, srv_page_size));
+	byte* page = static_cast<byte*>(aligned_malloc(2 * srv_page_size,
+						       srv_page_size));
 
 	memset(page, '\0', srv_page_size);
 
@@ -4608,7 +4604,7 @@ xb_space_create_file(
 				    page_zip.data, 0, zip_size);
 	}
 
-	free(buf);
+	aligned_free(page);
 
 	if (ret != DB_SUCCESS) {
 		msg("mariabackup: could not write the first page to %s",
@@ -4821,8 +4817,7 @@ xtrabackup_apply_delta(
 	xb_delta_info_t info(srv_page_size, 0, SRV_TMP_SPACE_ID);
 	ulint		page_size;
 	ulint		page_size_shift;
-	byte*		incremental_buffer_base = NULL;
-	byte*		incremental_buffer;
+	byte*		incremental_buffer = NULL;
 
 	size_t		offset;
 
@@ -4890,11 +4885,8 @@ xtrabackup_apply_delta(
 	posix_fadvise(dst_file, 0, 0, POSIX_FADV_DONTNEED);
 
 	/* allocate buffer for incremental backup (4096 pages) */
-	incremental_buffer_base = static_cast<byte *>
-		(malloc((page_size / 4 + 1) * page_size));
 	incremental_buffer = static_cast<byte *>
-		(ut_align(incremental_buffer_base,
-			  page_size));
+		(aligned_malloc(page_size / 4 * page_size, page_size));
 
 	msg("Applying %s to %s...", src_path, dst_path);
 
@@ -5003,7 +4995,7 @@ xtrabackup_apply_delta(
 		incremental_buffers++;
 	}
 
-	free(incremental_buffer_base);
+	aligned_free(incremental_buffer);
 	if (src_file != OS_FILE_CLOSED) {
 		os_file_close(src_file);
 		os_file_delete(0,src_path);
@@ -5013,7 +5005,7 @@ xtrabackup_apply_delta(
 	return TRUE;
 
 error:
-	free(incremental_buffer_base);
+	aligned_free(incremental_buffer);
 	if (src_file != OS_FILE_CLOSED)
 		os_file_close(src_file);
 	if (dst_file != OS_FILE_CLOSED)