MDEV-18115 Remove dummy tablespace for the redo log

Redo log subsystem was decoupled from tablespace subsystem. It now manages file
descriptors for redo log files by itself.

FIL_TYPE_LOG: removed, code in various places was simplified

SRV_LOG_SPACE_FIRST_ID: renamed to SRV_SPACE_ID_UPPER_BOUND
  to better match its purpose. Code in various places was simplified

fil_n_log_flushes: replaced with log_sys::flushes
fil_n_pending_log_flushes: replaced with log_sys::pending_flushes

log_t::files::files: redo log file descriptors
log_t::files::file_names: redo log file names

log_t::files::set_file_names(): set file names without opening them
log_t::files::open_files(): opens redo log files
log_t::files::read(): treats several files as one big
log_t::files::write(): treats several files as one big
log_t::files::fsync(): flushes page cache to disk
log_t::files::close_files(): closes redo log files

fil_open_log_and_system_tablespace_files(): renamed to
  fil_open_system_tablespace_files()
  and obviously it now doesn't open redo log files

global files[1000]: removed. Why it was needed at all?

1 files changed, 2 insertions, 2 deletions

diff --git a/storage/innobase/srv/srv0mon.cc b/storage/innobase/srv/srv0mon.cc
index c4cc8e86266..6eb7098574e 100644
--- a/storage/innobase/srv/srv0mon.cc
+++ b/storage/innobase/srv/srv0mon.cc
@@ -1774,12 +1774,12 @@ srv_mon_process_existing_counter(
 
 	/* innodb_os_log_fsyncs */
 	case MONITOR_OVLD_OS_LOG_FSYNC:
-		value = fil_n_log_flushes;
+		value = log_sys.get_flushes();
 		break;
 
 	/* innodb_os_log_pending_fsyncs */
 	case MONITOR_OVLD_OS_LOG_PENDING_FSYNC:
-		value = fil_n_pending_log_flushes;
+		value = log_sys.get_pending_flushes();
 		update_min = TRUE;
 		break;