Re: [PATCH 00/17] VFS: Filesystem information and notifications [ver #17]

[Miklos Szeredi]

On Sat, Mar 7, 2020 at 10:48 AM Greg Kroah-Hartman
<gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
>
> On Fri, Mar 06, 2020 at 05:25:49PM +0100, Miklos Szeredi wrote:
> > On Tue, Mar 03, 2020 at 08:46:09AM +0100, Miklos Szeredi wrote:
> > >
> > > I'm doing a patch.   Let's see how it fares in the face of all these
> > > preconceptions.
> >
> > Here's a first cut.  Doesn't yet have superblock info, just mount info.
> > Probably has rough edges, but appears to work.
> >
> > I started with sysfs, then kernfs, then went with a custom filesystem, because
> > neither could do what I wanted.
>
> Hm, what is wrong with kernfs that prevented you from using it here?
> Just complexity or something else?

I wanted to have a single instance covering all the namespaces, with
just a filtered view depending on which namespace the task is looking
at it.

Having a kernfs_node for each attribute is also rather heavy compared
to the size of struct mount.

Thanks,
Miklos