Re: [PATCH 06/17] block: introduce GENHD_FL_HIDDEN

On Mon, Oct 23 2017 at 10:51am -0400,
Christoph Hellwig [off-list ref] wrote:

With this flag a driver can create a gendisk that can be used for I/O
submission inside the kernel, but which is not registered as user
facing block device.  This will be useful for the NVMe multipath
implementation.

Having the NVme driver go to such lengths to hide its resources from
upper layers is certainly the work of an evil genius experiencing some
serious territorial issues.  Not sugar-coating it.. you wouldn't.

I kept meaning to reply to your earlier iterations on this series to
ask: can we please get a CONFIG_NVME_MULTIPATHING knob to make it so
that the NVMe driver doesn't implicitly consume (and hide) all
per-controler devices?

Ah well.  There is only one correct way to do NVMe multipathing after
all right?