# Re: \[PATCH 03/18\] block: fix elevator init check

- From: Martin K. Petersen \<hidden\>
- Date: 2017-01-26 03:01:08 
- List: linux-raid
- Page: https://ratatoskr.run/linux-raid/2017/01/6370502
- Thread: https://ratatoskr.run/linux-block/2017/01/6370502/t.md

```text
>>>>> "Christoph" == Christoph Hellwig [ref] writes:

Christoph> We can't initalize the elevator fields for flushes as flush
Christoph> share space in struct request with the elevator data.  But
Christoph> currently we can't commnicate that a request is a flush

communicate

Christoph> through blk_get_request as we can only pass READ or WRITE,
Christoph> and the low-level code looks at the possible NULL bio to
Christoph> check for a flush.

Christoph> Fix this by allowing to pass any block op and flags, and by
Christoph> checking for the flush flags in __get_request.

Reviewed-by: Martin K. Petersen <redacted>

-- 
Martin K. Petersen	Oracle Linux Engineering
```