[PATCH 06/17] block: introduce GENHD_FL_HIDDEN

[Christoph Hellwig]

On Sat, Oct 28, 2017 at 06:09:46PM +0800, Guan Junxiong wrote:
> Does it mean some extra works such as:
> 1) showing the path topology of nvme multipath device

It's in sysfs.  And Johannes volunteered to also add nvme-cli
support.

> 2) daemon to implement immediate and delayed failback

The whole point is to not have a daemon.

> 3) detecting sub-healthy path due to shaky link

We can do this in kernel space.  It just needs someone to implement it.

> 4) grouping paths besides ANA

We don't want to do non-standard grouping.  Please work with the
NVMe working group for your grouping ideas.