[PATCH] nvme: add namespace paths links

[Karel Zak]

On Tue, Apr 05, 2022 at 07:48:36AM +0200, Christoph Hellwig wrote:
> On Tue, Apr 05, 2022 at 07:46:40AM +0200, Hannes Reinecke wrote:
> > On 4/5/22 07:42, Christoph Hellwig wrote:
> >> On Fri, Apr 01, 2022 at 11:28:55AM +0200, Hannes Reinecke wrote:
> >>> It is really annoying to always have to loop through the entire
> >>> /sys/block directory just to find the namespace path links for
> >>> a single namespace in libnvme/nvme-cli.
> >>> So provide links to the namespace paths for efficient lookup.
> >>
> >> I think having some form of links would be useful.  Quite a while ago
> >> Thadeu looked into adding some form of relationship for lsblk and
> >> friends.  Maybe it would be good to sync up and make sure whatever
> >> links we are adding would be useful for all users?
> >>
> > Care to elaborate?
> > Using the block device name is the most straightforward way here; we don't 
> > have a good enumeration to leverage as the paths are essentially just a 
> > linked list.
> >
> > We sure can have a subdirectory 'paths', and stick the links in there.
> > If that helps with lsblk ...
> 
> I personally don't care.  But I've added Thadeu and the util-linux list
> to get everyone on board.
 
lsblk internally can accept arbitrary relations between devices
(and libsmartcols can display it). If you introduce something new or
extend the current holders/slaves, it will probably be accessible for
lsblk to use it.

    Karel

-- 
 Karel Zak  <kzak at redhat.com>
 http://karelzak.blogspot.com