MDEV-29050 mariabackup issues error messages during InnoDB tablespaces export on partial backup preparing

The solution is to suppress error messages for missing tablespaces if
mariabackup is launched with "--prepare --export" options.

"mariabackup --prepare --export" invokes itself with --mysqld parameter.
If the parameter is set, then it starts server to feed "FLUSH TABLES ...
FOR EXPORT;" queries for exported tablespaces. This is "normal" server
start, that's why new srv_operation value is introduced.

Reviewed by Marko Makela.

extra/mariabackup/xtrabackup.cc

@@ -6830,6 +6830,7 @@ int main(int argc, char **argv)
 		*/
 		if (strcmp(argv[1], "--mysqld") == 0)
 		{
+			srv_operation= SRV_OPERATION_EXPORT_RESTORED;
 			extern int mysqld_main(int argc, char **argv);
 			argc--;
 			argv++;

mysql-test/suite/mariabackup/partial_exclude.result

@@ -8,8 +8,15 @@ CREATE DATABASE db2;
 USE db2;
 CREATE TABLE t1(i INT) ENGINE INNODB;
 USE test;
+BEGIN;
+INSERT INTO db2.t1 VALUES(20);
+INSERT INTO test.t1 VALUES(20);
+INSERT INTO test.t2 VALUES(20);
 # xtrabackup backup
+COMMIT;
 t1.ibd
 DROP TABLE t1;
 DROP TABLE t2;
 DROP DATABASE db2;
+NOT FOUND /Operating system error number/ in backup.log
+NOT FOUND /Could not find a valid tablespace file for/ in backup.log

mysql-test/suite/mariabackup/partial_exclude.test

@@ -19,6 +19,11 @@ CREATE TABLE t1(i INT) ENGINE INNODB;
 
 USE test;
 
+BEGIN;
+INSERT INTO db2.t1 VALUES(20);
+INSERT INTO test.t1 VALUES(20);
+INSERT INTO test.t2 VALUES(20);
+
 echo # xtrabackup backup;
 
 let $targetdir=$MYSQLTEST_VARDIR/tmp/backup;
@@ -26,6 +31,8 @@ let $targetdir=$MYSQLTEST_VARDIR/tmp/backup;
 exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf  --backup "--tables-exclude=test.*2" "--databases-exclude=db2" --target-dir=$targetdir;
 --enable_result_log
 
+COMMIT;
+
 # check that only t1 table is in backup (t2 is excluded)
 list_files $targetdir/test *.ibd;
 # check that db2 database is not in the backup (excluded)
@@ -46,4 +53,17 @@ DROP DATABASE db2;
 rmdir $MYSQLD_DATADIR/db3;
 rmdir $MYSQLD_DATADIR/db4;
 rmdir $MYSQLD_DATADIR/db5;
+
+--let $backup_log=$MYSQLTEST_VARDIR/tmp/backup.log
+--disable_result_log
+exec $XTRABACKUP --defaults-file=$MYSQLTEST_VARDIR/my.cnf --export --prepare --target-dir="$targetdir" > $backup_log;
+--enable_result_log
+
+--let SEARCH_FILE=$backup_log
+--let SEARCH_PATTERN=Operating system error number
+--source include/search_pattern_in_file.inc
+--let SEARCH_PATTERN=Could not find a valid tablespace file for
+--source include/search_pattern_in_file.inc
+--remove_file $backup_log
+
 rmdir $targetdir;

storage/innobase/fil/fil0fil.cc

@@ -3235,10 +3235,15 @@ corrupted:
 		}
 	}
 
+	const bool operation_not_for_export =
+	  srv_operation != SRV_OPERATION_RESTORE_EXPORT
+	  && srv_operation != SRV_OPERATION_EXPORT_RESTORED;
+
 	/* Always look for a file at the default location. But don't log
 	an error if the tablespace is already open in remote or dict. */
 	ut_a(df_default.filepath());
-	const bool	strict = (tablespaces_found == 0);
+	const bool	strict = operation_not_for_export
+	  && (tablespaces_found == 0);
 	if (df_default.open_read_only(strict) == DB_SUCCESS) {
 		ut_ad(df_default.is_open());
 		++tablespaces_found;
@@ -3284,7 +3289,9 @@ corrupted:
 	/* Make sense of these three possible locations.
 	First, bail out if no tablespace files were found. */
 	if (valid_tablespaces_found == 0) {
-		os_file_get_last_error(true);
+		os_file_get_last_error(
+		    operation_not_for_export, !operation_not_for_export);
+		if (operation_not_for_export)
 		  ib::error() << "Could not find a valid tablespace file for `"
 		    << tablename << "`. " << TROUBLESHOOT_DATADICT_MSG;
 		goto corrupted;
@@ -3617,6 +3624,7 @@ fil_ibd_discover(
 		case SRV_OPERATION_RESTORE:
 			break;
 		case SRV_OPERATION_NORMAL:
+		case SRV_OPERATION_EXPORT_RESTORED:
 			df_rem_per.set_name(db);
 			if (df_rem_per.open_link_file() != DB_SUCCESS) {
 				break;

storage/innobase/fsp/fsp0file.cc

@@ -787,7 +787,7 @@ the double write buffer.
 bool
 Datafile::restore_from_doublewrite()
 {
-	if (srv_operation != SRV_OPERATION_NORMAL) {
+	if (srv_operation > SRV_OPERATION_EXPORT_RESTORED) {
 		return true;
 	}
 

storage/innobase/fsp/fsp0sysspace.cc

@@ -580,7 +580,7 @@ SysTablespace::read_lsn_and_check_flags(lsn_t* flushed_lsn)
 
 	ut_a(it->order() == 0);
 
-	if (srv_operation == SRV_OPERATION_NORMAL) {
+	if (srv_operation <= SRV_OPERATION_EXPORT_RESTORED) {
 		buf_dblwr_init_or_load_pages(it->handle(), it->filepath());
 	}
 

storage/innobase/include/os0file.h

@@ -1210,13 +1210,14 @@ os_file_flush_func(
 /** Retrieves the last error number if an error occurs in a file io function.
 The number should be retrieved before any other OS calls (because they may
 overwrite the error number). If the number is not known to this program,
-the OS error number + 100 is returned.
+the OS error number + OS_FILE_ERROR_MAX is returned.
-@param[in]	report		true if we want an error message printed
+@param[in]	report_all_errors	true if we want an error message
-				for all errors
+                                        printed of all errors
-@return error number, or OS error number + 100 */
+@param[in]	on_error_silent		true then don't print any diagnostic
-ulint
+                                        to the log
-os_file_get_last_error(
+@return error number, or OS error number + OS_FILE_ERROR_MAX */
-	bool		report);
+ulint os_file_get_last_error(bool report_all_errors,
+                             bool on_error_silent= false);
 
 /** NOTE! Use the corresponding macro os_file_read(), not directly this
 function!

storage/innobase/include/srv0srv.h

@@ -469,6 +469,9 @@ extern my_bool	innodb_encrypt_temporary_tables;
 enum srv_operation_mode {
 	/** Normal mode (MariaDB Server) */
 	SRV_OPERATION_NORMAL,
+	/** Mariabackup is executing server to export already restored
+	tablespaces */
+	SRV_OPERATION_EXPORT_RESTORED,
 	/** Mariabackup taking a backup */
 	SRV_OPERATION_BACKUP,
 	/** Mariabackup restoring a backup for subsequent --copy-back */

storage/innobase/log/log0recv.cc

@@ -406,7 +406,7 @@ fil_name_process(
 		return;
 	}
 
-	ut_ad(srv_operation == SRV_OPERATION_NORMAL
+	ut_ad(srv_operation <= SRV_OPERATION_EXPORT_RESTORED
 	      || is_mariabackup_restore_or_export());
 
 	/* We will also insert space=NULL into the map, so that
@@ -2286,7 +2286,7 @@ buf_block_t* recv_recovery_create_page_low(const page_id_t page_id)
 				performed as part of the operation */
 void recv_apply_hashed_log_recs(bool last_batch)
 {
-	ut_ad(srv_operation == SRV_OPERATION_NORMAL
+	ut_ad(srv_operation <= SRV_OPERATION_EXPORT_RESTORED
 	      || is_mariabackup_restore_or_export());
 
 	mutex_enter(&recv_sys.mutex);
@@ -3603,7 +3603,7 @@ recv_recovery_from_checkpoint_start(lsn_t flush_lsn)
 	byte*		buf;
 	dberr_t		err = DB_SUCCESS;
 
-	ut_ad(srv_operation == SRV_OPERATION_NORMAL
+	ut_ad(srv_operation <= SRV_OPERATION_EXPORT_RESTORED
 	      || is_mariabackup_restore_or_export());
 
 	/* Initialize red-black tree for fast insertions into the
@@ -3797,7 +3797,7 @@ recv_recovery_from_checkpoint_start(lsn_t flush_lsn)
 
 		recv_sys.parse_start_lsn = checkpoint_lsn;
 
-		if (srv_operation == SRV_OPERATION_NORMAL) {
+		if (srv_operation <= SRV_OPERATION_EXPORT_RESTORED) {
 			buf_dblwr_process();
 		}
 
@@ -3862,7 +3862,8 @@ recv_recovery_from_checkpoint_start(lsn_t flush_lsn)
 
 	log_sys.last_checkpoint_lsn = checkpoint_lsn;
 
-	if (!srv_read_only_mode && srv_operation == SRV_OPERATION_NORMAL) {
+	if (!srv_read_only_mode
+	    && srv_operation <= SRV_OPERATION_EXPORT_RESTORED) {
 		/* Write a MLOG_CHECKPOINT marker as the first thing,
 		before generating any other redo log. This ensures
 		that subsequent crash recovery will be possible even

storage/innobase/os/os0file.cc

@@ -2291,11 +2291,7 @@ the OS error number + OS_FILE_ERROR_MAX is returned.
 @param[in]	on_error_silent		true then don't print any diagnostic
                                         to the log
 @return error number, or OS error number + OS_FILE_ERROR_MAX */
-static
+ulint os_file_get_last_error(bool report_all_errors, bool on_error_silent)
-ulint
-os_file_get_last_error_low(
-	bool	report_all_errors,
-	bool	on_error_silent)
 {
 	int	err = errno;
 
@@ -3407,16 +3403,12 @@ os_file_flush_func(
 The number should be retrieved before any other OS calls (because they may
 overwrite the error number). If the number is not known to this program,
 the OS error number + 100 is returned.
-@param[in]	report_all_errors	true if we want an error message printed
+@param[in]	report_all_errors	true if we want an error message
-					of all errors
+printed of all errors
 @param[in]	on_error_silent		true then don't print any diagnostic
                                         to the log
 @return error number, or OS error number + 100 */
-static
+ulint os_file_get_last_error(bool report_all_errors, bool on_error_silent)
-ulint
-os_file_get_last_error_low(
-	bool	report_all_errors,
-	bool	on_error_silent)
 {
 	ulint	err = (ulint) GetLastError();
 
@@ -4700,20 +4692,6 @@ os_file_read_page(
 	return err;
 }
 
-/** Retrieves the last error number if an error occurs in a file io function.
-The number should be retrieved before any other OS calls (because they may
-overwrite the error number). If the number is not known to this program,
-the OS error number + 100 is returned.
-@param[in]	report_all_errors	true if we want an error printed
-					for all errors
-@return error number, or OS error number + 100 */
-ulint
-os_file_get_last_error(
-	bool	report_all_errors)
-{
-	return(os_file_get_last_error_low(report_all_errors, false));
-}
-
 /** Handle errors for file operations.
 @param[in]	name		name of a file or NULL
 @param[in]	operation	operation
@@ -4730,7 +4708,7 @@ os_file_handle_error_cond_exit(
 {
 	ulint	err;
 
-	err = os_file_get_last_error_low(false, on_error_silent);
+	err = os_file_get_last_error(false, on_error_silent);
 
 	switch (err) {
 	case OS_FILE_DISK_FULL:

storage/innobase/srv/srv0start.cc

@@ -810,7 +810,7 @@ srv_undo_tablespaces_init(bool create_new_db)
 	srv_undo_tablespaces_open = 0;
 
 	ut_a(srv_undo_tablespaces <= TRX_SYS_N_RSEGS);
-	ut_a(!create_new_db || srv_operation == SRV_OPERATION_NORMAL);
+	ut_a(!create_new_db || srv_operation <= SRV_OPERATION_EXPORT_RESTORED);
 
 	if (srv_undo_tablespaces == 1) { /* 1 is not allowed, make it 0 */
 		srv_undo_tablespaces = 0;
@@ -876,6 +876,7 @@ srv_undo_tablespaces_init(bool create_new_db)
 		prev_space_id = srv_undo_space_id_start - 1;
 		break;
 	case SRV_OPERATION_NORMAL:
+	case SRV_OPERATION_EXPORT_RESTORED:
 	case SRV_OPERATION_RESTORE_ROLLBACK_XA:
 	case SRV_OPERATION_RESTORE:
 	case SRV_OPERATION_RESTORE_EXPORT:
@@ -1132,6 +1133,7 @@ srv_shutdown_all_bg_threads()
 		case SRV_OPERATION_RESTORE_DELTA:
 			break;
 		case SRV_OPERATION_NORMAL:
+		case SRV_OPERATION_EXPORT_RESTORED:
 		case SRV_OPERATION_RESTORE_ROLLBACK_XA:
 		case SRV_OPERATION_RESTORE:
 		case SRV_OPERATION_RESTORE_EXPORT:
@@ -1310,7 +1312,7 @@ dberr_t srv_start(bool create_new_db)
 	size_t		dirnamelen;
 	unsigned	i = 0;
 
-	ut_ad(srv_operation == SRV_OPERATION_NORMAL
+	ut_ad(srv_operation <= SRV_OPERATION_EXPORT_RESTORED
 	      || is_mariabackup_restore_or_export());
 
 
@@ -1894,6 +1896,7 @@ files_checked:
 
 		switch (srv_operation) {
 		case SRV_OPERATION_NORMAL:
+		case SRV_OPERATION_EXPORT_RESTORED:
 		case SRV_OPERATION_RESTORE_ROLLBACK_XA:
 		case SRV_OPERATION_RESTORE_EXPORT:
 			/* Initialize the change buffer. */
@@ -2304,7 +2307,8 @@ skip_monitors:
 		return(srv_init_abort(err));
 	}
 
-	if (!srv_read_only_mode && srv_operation == SRV_OPERATION_NORMAL) {
+	if (!srv_read_only_mode
+	    && srv_operation <= SRV_OPERATION_EXPORT_RESTORED) {
 		/* Initialize the innodb_temporary tablespace and keep
 		it open until shutdown. */
 		err = srv_open_tmp_tablespace(create_new_db);
@@ -2326,7 +2330,7 @@ skip_monitors:
 	}
 
 	if (!srv_read_only_mode
-	    && (srv_operation == SRV_OPERATION_NORMAL
+	    && (srv_operation <= SRV_OPERATION_EXPORT_RESTORED
 		|| srv_operation == SRV_OPERATION_RESTORE_ROLLBACK_XA)
 	    && srv_force_recovery < SRV_FORCE_NO_BACKGROUND) {
 
@@ -2465,6 +2469,7 @@ void innodb_shutdown()
 		fil_close_all_files();
 		break;
 	case SRV_OPERATION_NORMAL:
+	case SRV_OPERATION_EXPORT_RESTORED:
 		/* Shut down the persistent files. */
 		logs_empty_and_mark_files_at_shutdown();