MySQL Bugs: #118872: Innodb_data_written lacks statistics for double-write files

Bug #118872	Innodb_data_written lacks statistics for double-write files
Submitted:	21 Aug 5:01	Modified:	21 Aug 6:30
Reporter:	Ke Yu (OCA)	Email Updates:
Status:	Verified	Impact on me:	None
Category:	MySQL Server: InnoDB storage engine	Severity:	S3 (Non-critical)
Version:	8.0.40	OS:	Any
Assigned to:		CPU Architecture:	Any

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Description:
Innodb_data_written lacks statistics for double-write files.

How to repeat:
Just from the code.

This bug was introduced by WL#5655 in 8.0.20.
Before 8.0.20, the writing of double-write file accomplished by fil_io(). fil_io() will call Fil_shard::do_io() which will increase the Innodb_data_written：
```
Fil_shard::do_io{
...
  srv_stats.data_written.add(len);
...
}
```

After 8.0.20, the writing of double-write file accomplished by dblwr::Segment::write() which does not increase the Innodb_data_written.

Suggested fix:
call srv_stats.data_written.add(len) in dblwr::Segment::write().

Hello Ke Yu,

Thank you for the report and feedback.

regards,
Umesh