MDEV-12218: Put back mariabackup --innodb-flush-method

Implement innodb_flush_method as an enum parameter in Mariabackup,
instead of ignoring the option and hard-wiring it to a default value.

xb0xb.h: Remove. Only xtrabackup.cc refers to the enum parameters.

innodb_flush_method_names[], innodb_flush_method_typelib[]:
Define as non-static, so that mariabackup can share the definitions.

srv_file_flush_method: Change the type to ulong, to match the
assignment in init_one_value() and handle_options() in mariabackup.

extra/mariabackup/backup_copy.cc

@@ -57,8 +57,6 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 #include "backup_copy.h"
 #include "backup_mysql.h"
 #include <btr0btr.h>
-#include "xb0xb.h"
-
 
 /* list of files to sync for --rsync mode */
 static std::set<std::string> rsync_list;

extra/mariabackup/fil_cur.cc

@@ -33,7 +33,6 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 #include "common.h"
 #include "read_filt.h"
 #include "xtrabackup.h"
-#include "xb0xb.h"
 
 /* Size of read buffer in pages (640 pages = 10M for 16K sized pages) */
 #define XB_FIL_CUR_PAGES 640

extra/mariabackup/xb0xb.h

-/******************************************************
-Copyright (c) 2012 Percona LLC and/or its affiliates.
-
-Declarations of XtraBackup functions called by InnoDB code.
-
-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 Foundation; version 2 of the License.
-
-This program is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with this program; if not, write to the Free Software
-Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
-
-*******************************************************/
-
-#ifndef xb0xb_h
-#define xb0xb_h
-
-extern const char *innodb_checksum_algorithm_names[];
-extern TYPELIB innodb_checksum_algorithm_typelib;
-
-#endif

extra/mariabackup/xtrabackup.cc

@@ -97,7 +97,6 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 #include "backup_mysql.h"
 #include "backup_copy.h"
 #include "backup_mysql.h"
-#include "xb0xb.h"
 #include "encryption_plugin.h"
 #include <sql_plugin.h>
 #include <srv0srv.h>
@@ -297,6 +296,11 @@ my_bool opt_remove_original;
 
 my_bool opt_lock_ddl_per_table = FALSE;
 
+extern const char *innodb_checksum_algorithm_names[];
+extern TYPELIB innodb_checksum_algorithm_typelib;
+extern const char *innodb_flush_method_names[];
+extern TYPELIB innodb_flush_method_typelib;
+
 static const char *binlog_info_values[] = {"off", "lockless", "on", "auto",
 					   NullS};
 static TYPELIB binlog_info_typelib = {array_elements(binlog_info_values)-1, "",
@@ -617,6 +621,7 @@ enum options_xtrabackup
   OPT_INNODB_ADAPTIVE_HASH_INDEX,
   OPT_INNODB_DOUBLEWRITE,
   OPT_INNODB_FILE_PER_TABLE,
+  OPT_INNODB_FLUSH_METHOD,
   OPT_INNODB_LOG_GROUP_HOME_DIR,
   OPT_INNODB_MAX_DIRTY_PAGES_PCT,
   OPT_INNODB_MAX_PURGE_LAG,
@@ -1119,6 +1124,12 @@ struct my_option xb_server_options[] =
    (G_PTR*) &innobase_file_per_table, 0, GET_BOOL, NO_ARG,
    FALSE, 0, 0, 0, 0, 0},
 
+  {"innodb_flush_method", OPT_INNODB_FLUSH_METHOD,
+   "With which method to flush data.",
+   &srv_file_flush_method, &srv_file_flush_method,
+   &innodb_flush_method_typelib, GET_ENUM, REQUIRED_ARG,
+   IF_WIN(SRV_ALL_O_DIRECT_FSYNC, SRV_FSYNC), 0, 0, 0, 0, 0},
+
   {"innodb_log_buffer_size", OPT_INNODB_LOG_BUFFER_SIZE,
    "The size of the buffer which InnoDB uses to write log to the log files on disk.",
    (G_PTR*) &srv_log_buffer_size, (G_PTR*) &srv_log_buffer_size, 0,
@@ -1466,6 +1477,12 @@ xb_get_one_option(int optid,
   case OPT_INNODB_LOG_FILE_SIZE:
     break;
 
+  case OPT_INNODB_FLUSH_METHOD:
+    ut_a(srv_file_flush_method
+	 <= IF_WIN(SRV_ALL_O_DIRECT_FSYNC, SRV_O_DIRECT_NO_FSYNC));
+    ADD_PRINT_PARAM_OPT(innodb_flush_method_names[srv_file_flush_method]);
+    break;
+
   case OPT_INNODB_PAGE_SIZE:
 
     ADD_PRINT_PARAM_OPT(innobase_page_size);
@@ -1760,7 +1777,6 @@ static bool innodb_init_param()
 #ifdef _WIN32
 	srv_use_native_aio = TRUE;
 #endif
-	srv_file_flush_method = IF_WIN(SRV_ALL_O_DIRECT_FSYNC, SRV_FSYNC);
 	return false;
 
 error:

storage/innobase/fil/fil0fil.cc

@@ -4691,7 +4691,7 @@ fil_aio_wait(
 		and can only end up here when writing a log checkpoint! */
 		ut_a(ptrdiff_t(message) == 1);
 		/* It was a checkpoint write */
-		switch (srv_file_flush_method) {
+		switch (srv_flush_t(srv_file_flush_method)) {
 		case SRV_O_DSYNC:
 		case SRV_NOSYNC:
 			break;

storage/innobase/handler/ha_innodb.cc

@@ -431,7 +431,7 @@ static TYPELIB innodb_lock_schedule_algorithm_typelib = {
 };
 
 /** Names of allowed values of innodb_flush_method */
-static const char* innodb_flush_method_names[] = {
+const char* innodb_flush_method_names[] = {
 	"fsync",
 	"O_DSYNC",
 	"littlesync",
@@ -447,7 +447,7 @@ static const char* innodb_flush_method_names[] = {
 };
 
 /** Enumeration of innodb_flush_method */
-static TYPELIB innodb_flush_method_typelib = {
+TYPELIB innodb_flush_method_typelib = {
 	array_elements(innodb_flush_method_names) - 1,
 	"innodb_flush_method_typelib",
 	innodb_flush_method_names,

storage/innobase/include/srv0srv.h

@@ -658,8 +658,7 @@ extern PSI_stage_info	srv_stage_buffer_pool_load;
 #endif /* HAVE_PSI_STAGE_INTERFACE */
 
 
-/** Alternatives for the file flush option in Unix; see the InnoDB manual
-about what these mean */
+/** Alternatives for innodb_flush_method */
 enum srv_flush_t {
 	SRV_FSYNC = 0,	/*!< fsync, the default */
 	SRV_O_DSYNC,	/*!< open log files in O_SYNC mode */
@@ -686,7 +685,8 @@ enum srv_flush_t {
 				all files without caching, and do FileFlushBuffers()*/
 #endif
 };
-extern enum srv_flush_t	srv_file_flush_method;
+/** innodb_flush_method */
+extern ulong srv_file_flush_method;
 
 /** Alternatives for srv_force_recovery. Non-zero values are intended
 to help the user get a damaged database up so that he can dump intact

storage/innobase/srv/srv0srv.cc

@@ -278,7 +278,7 @@ ulong	srv_read_ahead_threshold;
 buffer in terms of percentage of the buffer pool. */
 uint	srv_change_buffer_max_size;
 
-enum srv_flush_t	srv_file_flush_method;
+ulong	srv_file_flush_method;
 
 
 /** copy of innodb_open_files; @see innodb_init_params() */