[PATCH V3 1/1] nvme: introduce generic per-namespace chardev

[Kanchan Joshi]

On Wed, Apr 21, 2021 at 1:23 PM Minwoo Im <minwoo.im.dev at gmail.com> wrote:
>
> Userspace has not been allowed to I/O to device that's failed to
> be initialized.  This patch introduces generic per-namespace character
> device to allow userspace to I/O regardless the block device is there or
> not.
>
> The chardev naming convention will similar to the existing blkdev naming,
> using a ng prefix instead of nvme, i.e.
>
>         - /dev/ngXnY
>
> It also supports multipath which means it will not expose chardev for the
> hidden namespace blkdevs (e.g., nvmeXcYnZ).  If /dev/ngXnY is created for
> a ns_head, then I/O request will be routed to a specific controller
> selected by the iopolicy of the subsystem.

Tested-by: Kanchan Joshi <joshi.k at samsung.com>

-- 
Joshi