[PATCHv4] nvme: add 'iopolicy' module parameter

[Daniel Wagner]

On Mon, Dec 20, 2021 at 01:51:45PM +0100, Hannes Reinecke wrote:
> While the 'iopolicy' sysfs attribute can be set at runtime, most
> storage arrays prefer to use the 'round-robin' iopolicy per default.
> We can use udev rules to set this, but is getting rather unwieldy
> for rebranded arrays as we would have to update the udev rules
> anytime a new array shows up, leading to the same mess we currently
> have in multipathd for configuring the RDAC arrays.
> 
> Hence this patch adds a module parameter 'iopolicy' to allow the
> admin to switch the default, and to do away with the need for a
> udev rule here.
> 
> Signed-off-by: Hannes Reinecke <hare at suse.de>

Reviewed-by: Daniel Wagner <dwagner at suse.de>