Remove the unused redo log record type MLOG_INIT_FILE_PAGE

InnoDB stopped generating the MLOG_INIT_FILE_PAGE record in
MySQL 5.7.5. Starting with MySQL 5.7.9 (which was imported to
MariaDB Server 10.2.2), the InnoDB redo log format tag prevents
crash recovery from old-format redo logs.

Remove the dead code for dealing with MLOG_INIT_FILE_PAGE.

storage/innobase/include/mtr0types.h

@@ -129,14 +129,6 @@ enum mlog_id_t {
 	MLOG_LSN = 28,
 #endif /* UNIV_LOG_LSN_DEBUG */
 
-	/** this means that a file page is taken into use and the prior
-	contents of the page should be ignored: in recovery we must not
-	trust the lsn values stored to the file page.
-	Note: it's deprecated because it causes crash recovery problem
-	in bulk create index, and actually we don't need to reset page
-	lsn in recv_recover_page_func() now. */
-	MLOG_INIT_FILE_PAGE = 29,
-
 	/** write a string to a page */
 	MLOG_WRITE_STRING = 30,
 
@@ -224,8 +216,7 @@ enum mlog_id_t {
 	/** create a R-tree compact page */
 	MLOG_COMP_PAGE_CREATE_RTREE = 58,
 
-	/** this means that a file page is taken into use.
-	We use it to replace MLOG_INIT_FILE_PAGE. */
+	/** initialize a file page */
 	MLOG_INIT_FILE_PAGE2 = 59,
 
 	/** Table is being truncated. (Marked only for file-per-table) */

storage/innobase/log/log0recv.cc

@@ -1400,7 +1400,6 @@ recv_parse_or_apply_log_rec_body(
 		/* Allow anything in page_type when creating a page. */
 		ptr = ibuf_parse_bitmap_init(ptr, end_ptr, block, mtr);
 		break;
-	case MLOG_INIT_FILE_PAGE:
 	case MLOG_INIT_FILE_PAGE2:
 		/* Allow anything in page_type when creating a page. */
 		ptr = fsp_parse_init_file_page(ptr, end_ptr, block);
@@ -1753,18 +1752,6 @@ recv_recover_page(bool just_read_in, buf_block_t* block)
 			buf = ((byte*)(recv->data)) + sizeof(recv_data_t);
 		}
 
-		if (recv->type == MLOG_INIT_FILE_PAGE) {
-			page_lsn = page_newest_lsn;
-
-			memset(FIL_PAGE_LSN + page, 0, 8);
-			memset(UNIV_PAGE_SIZE - FIL_PAGE_END_LSN_OLD_CHKSUM
-			       + page, 0, 8);
-
-			if (page_zip) {
-				memset(FIL_PAGE_LSN + page_zip->data, 0, 8);
-			}
-		}
-
 		/* If per-table tablespace was truncated and there exist REDO
 		records before truncate that are to be applied as part of
 		recovery (checkpoint didn't happen since truncate was done)
@@ -3619,9 +3606,6 @@ get_mlog_string(mlog_id_t type)
 		return("MLOG_LSN");
 #endif /* UNIV_LOG_LSN_DEBUG */
 
-	case MLOG_INIT_FILE_PAGE:
-		return("MLOG_INIT_FILE_PAGE");
-
 	case MLOG_WRITE_STRING:
 		return("MLOG_WRITE_STRING");