Re: [PATCH 1/4] block: export part_in_flight()

[Christoph Hellwig]

On Sat, Apr 12, 2025 at 03:31:59PM +0800, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@xxxxxxxxxx>
> 
> This helper will be used in mdraid in later patches, check if there
> are normal IO inflight while generating background sync IO, to fix a
> problem in mdraid that foreground IO can be starved by background sync
> IO.

If we export this it needs a kerneldoc comment, and probably also
a better name.

Looking at this I'm also a little confused about blk_mq_in_flight_rw vs
blk_mq_in_flight and why one needs blk-mq special casing and the other
not, maybe we need to dig into the history and try to understand that
as well while we're at it.