[dm-devel] [patch 5/5] block: use a driver-specific handler for the "inflight" value

[Christoph Hellwig]

On Tue, Nov 06, 2018 at 10:35:03PM +0100, Mikulas Patocka wrote:
> Device mapper was converted to percpu inflight counters. In order to
> display the correct values in the "inflight" sysfs file, we need a custom
> callback that sums the percpu counters.

The attribute that calls this is per-partition, while your method
is per-queue, so there is some impedence mismatch here.

Is there any way you could look into just making the generic code
use percpu counters?

Also please cc linux-block on patches that touch the generic block
code.