Re: [PATCH] nvme: create 'paths' entries for hidden controllers

[Thadeu Lima de Souza Cascardo]

On Fri, Oct 05, 2018 at 09:32:45AM +0200, Christoph Hellwig wrote:
> On Fri, Sep 28, 2018 at 04:17:20PM -0300, Thadeu Lima de Souza Cascardo wrote:
> > When using initramfs-tools with only the necessary dependencies to mount
> > the root filesystem, it will fail to include nvme drivers for a root on a
> > multipath nvme. That happens because the slaves relationship is not
> > present.
> > 
> > As discussed in [1], using slaves will break lsblk, because the slaves are
> > hidden from userspace, that is, they have no real block device, just an
> > entry under sysfs.
> > 
> > Introducing the paths subdir and using that on initramfs-tools makes it
> > possible to now boot a system with nvme multipath as root.
> 
> Do we need documentation how these paths links are supposed to work?
> Who is going to parse them?

Hi, Christoph.

I have just sent a v2 against block/for-next with a Documentation file
describing it. The first intended user is initramfs-tools, documented there as
well.

Thanks.
Cascardo.