MDEV-13557: Startup failure, unable to decrypt ibdata1

Fixes also MDEV-13488: InnoDB writes CRYPT_INFO even though
encryption is not enabled.

Fixes also MDEV-13093: Leak of Datafile::m_crypt_info on
shutdown after failed startup.

Problem was that we created encryption metadata (crypt_data) for
system tablespace even when no encryption was enabled and too early.
System tablespace can be encrypted only using key rotation.

Test innodb-key-rotation-disable, innodb_encryption, innodb_lotoftables
require adjustment because INFORMATION_SCHEMA INNODB_TABLESPACES_ENCRYPTION
contain row only if tablespace really has encryption metadata.

xb_load_single_table_tablespace(): Do not call
fil_space_destroy_crypt_data() any more, because Datafile::m_crypt_data
has been removed.

fil_crypt_realloc_iops(): Avoid divide by zero.

fil_crypt_set_thread_cnt(): Set fil_crypt_threads_event if
encryption threads exist. This is required to find tablespaces
requiring key rotation if no other changes happen.

fil_crypt_find_space_to_rotate(): Decrease the amount of time waiting
when nothing happens to better enable key rotation on startup.

fil_ibd_open(), fil_ibd_load(): Load possible crypt_data from first
page.

class Datafile, class SysTablespace : remove m_crypt_info field.

Datafile::get_first_page(): Return a pointer to first page buffer.

fsp_header_init(): Write encryption metadata to page 0 only if
tablespace is encrypted or encryption is disabled by table option.

i_s_dict_fill_tablespaces_encryption(): Skip tablespaces that do not
contain encryption metadata. This is required to avoid too early
wait condition trigger in encrypted -> unencrypted state transfer.

1 files changed, 22 insertions, 10 deletions

diff --git a/mysql-test/suite/encryption/t/innodb-first-page-read.test b/mysql-test/suite/encryption/t/innodb-first-page-read.test
index 1fc07159e05..d661e4565d2 100644
--- a/mysql-test/suite/encryption/t/innodb-first-page-read.test
+++ b/mysql-test/suite/encryption/t/innodb-first-page-read.test
@@ -7,6 +7,8 @@ SET GLOBAL innodb_file_format = `Barracuda`;
 SET GLOBAL innodb_file_per_table = ON;
 --enable_warnings
 
+FLUSH STATUS;
+
 create database innodb_test;
 use innodb_test;
 create table innodb_normal(c1 bigint not null, b char(200)) engine=innodb;
@@ -63,16 +65,19 @@ insert into innodb_datadir2 select * from innodb_normal;
 insert into innodb_datadir3 select * from innodb_normal;
 commit;
 
+FLUSH STATUS;
+
 --echo # Restart server and see how many page 0's are read
 --source include/restart_mysqld.inc
 
---echo # result should be less than actual number of tables
---echo # i.e. < 23 + 3 = 26
-show status like 'innodb_pages0_read%';
+--echo # result should actual number of tables except remote tables could be read twice
+--echo # i.e. < 23 + 3*2 = 29
+
+SELECT VARIABLE_VALUE <= 29  FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'innodb_pages0_read';
 use innodb_test;
-show status like 'innodb_pages0_read%';
+SELECT VARIABLE_VALUE <= 29  FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'innodb_pages0_read';
 use test;
-show status like 'innodb_pages0_read%';
+SELECT VARIABLE_VALUE <= 29  FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'innodb_pages0_read';
 
 set global innodb_encrypt_tables=OFF;
 
@@ -80,18 +85,25 @@ set global innodb_encrypt_tables=OFF;
 --let $wait_condition=SELECT COUNT(*) = 0 FROM INFORMATION_SCHEMA.INNODB_TABLESPACES_ENCRYPTION WHERE MIN_KEY_VERSION <> 0
 --source include/wait_condition.inc
 
-show status like 'innodb_pages0_read%';
+--echo # result should be actual number of tables except remote tables could be read twice
+--echo # i.e. < 23 + 3*2 = 29
+
+SELECT VARIABLE_VALUE <= 29  FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'innodb_pages0_read';
 use innodb_test;
-show status like 'innodb_pages0_read%';
+SELECT VARIABLE_VALUE <= 29  FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'innodb_pages0_read';
 use test;
+SELECT VARIABLE_VALUE <= 29  FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'innodb_pages0_read';
+
+FLUSH STATUS;
 
 --echo # restart and see number read page 0
 -- source include/restart_mysqld.inc
 
-show status like 'innodb_pages0_read%';
+SELECT VARIABLE_VALUE <= 29  FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'innodb_pages0_read';
 use innodb_test;
-show status like 'innodb_pages0_read%';
+SELECT VARIABLE_VALUE <= 29  FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'innodb_pages0_read';
 use test;
+SELECT VARIABLE_VALUE <= 29  FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'innodb_pages0_read';
 
 drop database innodb_test;
-show status like 'innodb_pages0_read%';
+FLUSH STATUS;