[PATCH V6 1/2] nvme: enable char device per namespace

[Keith Busch]

On Thu, Mar 25, 2021 at 12:25:24PM +0000, Niklas Cassel wrote:
> On Mon, Mar 01, 2021 at 08:24:51PM +0100, javier at javigon.com wrote:
> > From: Javier González <javier.gonz at samsung.com>
> > 
> > Create a char device per NVMe namespace. This char device is always
> > initialized, independently of whether the features implemented by the
> > device are supported by the kernel. User-space can therefore always
> > issue IOCTLs to the NVMe driver using the char device.
> > 
> > The char device is presented as /dev/nvme-generic-XcYnZ. This naming
> > scheme follows the convention of the hidden device (nvmeXcYnZ). Support
> > for multipath will follow.
> 
> Do we perhaps want to put these new character devices inside a subdir?
> e.g. /dev/nvme/nvme-generic-XcYnZ ?

I actually suggested the same hierarchy, but that was rejected.
 
> Otherwise it feels like doing such a simple thing as ls -al /dev/nvme*
> will show a lot of devices because of these new specialized char devices.