[PATCH 13/13] nvme: introduce generic per-namespace chardev

[Minwoo Im]

On 21-04-09 09:54:15, Christoph Hellwig wrote:
> On Fri, Apr 09, 2021 at 04:29:01PM +0900, Minwoo Im wrote:
> > Tested with namespace-specific admin commmand (Identify Namespace).  And
> > it fails with invalid IOCTl because we don't have a route to the
> > controller IOCTL for the generic chrdev.
> 
> Yes, that is intentional, as supporting the per-controller ioctls
> on the per-namespace devices is a mess.

In multipath case, head blkdev is also per-namespace node which is now
supporting the controller ioctl by nvme_find_get_live_ctrl().  Is there
any different policy between the existing blkdev and generic device in
the current series ? Or should be just deprecate the controller ioctl
from the head blkdev ioctl in multipath case ?