[PATCH 20/39] afs: simplify procfs code

[Christoph Hellwig]

On Fri, Apr 20, 2018 at 01:29:34PM +0100, David Howells wrote:
> David Howells <dhowells at redhat.com> wrote:
> 
> > > Use remove_proc_subtree to remove the whole subtree on cleanup, and
> > > unwind the registration loop into individual calls.  Switch to use
> > > proc_create_seq where applicable.
> > 
> > Note that this is likely going to clash with my patch to net-namespace all of
> > the afs proc files:
> > 
> > 	https://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs.git/commit/?h=mount-context&id=f60c26c827c073583107ebf19d87bc5c0e71c3d2
> > 
> > If it helps, I should be able to disentangle this from the mount-api changes
> > since the subsequent patch connects the dots to propagate the network
> > namespace over automount using the new fs_context to do it.
> 
> Okay, I'll follow up this mail with a pair of patches to just use network
> namespacing in AFS.  The first exports a function from core code only; the
> second is the actual modifications to AFS.

I don't think you should need any of these.  seq_file_net or
seq_file_single_net will return you the net_ns based on a struct
seq_file.  And even from your write routines you can reach the
seq_file in file->private pretty easily.