linux-kernel - Re: [RFC v3 0/2] vfs / btrfs: add support for ustat()

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Date:   Fri, 16 Apr 2021 13:20:40 -0400
From:   Neal Gompa <ngompa13@...il.com>
To:     Luis Chamberlain <mcgrof@...nel.org>
Cc:     Josef Bacik <josef@...icpanda.com>,
        Filipe Manana <fdmanana@...e.com>,
        David Sterba <dsterba@...e.cz>,
        Al Viro <viro@...iv.linux.org.uk>, Chris Mason <clm@...com>,
        Josef Bacik <jbacik@...com>,
        Christoph Hellwig <hch@...radead.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Btrfs BTRFS <linux-btrfs@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jeff Mahoney <jeffm@...e.com>
Subject: Re: [RFC v3 0/2] vfs / btrfs: add support for ustat()

On Thu, Apr 15, 2021 at 2:29 PM Luis Chamberlain <mcgrof@...nel.org> wrote:
>
> On Thu, Apr 15, 2021 at 02:17:58PM -0400, Josef Bacik wrote:
> > There's a lot of larger things that need to
> > be addressed in general to support the volume approach inside file systems
> > that is going to require a lot of work inside of VFS.  If you feel like
> > tackling that work and then wiring up btrfs by all means have at it, but I'm
> > not seeing a urgent need to address this.  Thanks,
>
> That's precisely what I what I want to hear me about. Things like this.
> Would btrfs be the ony user of volumes inside filesystem? Jeff had
> mentioned before this could also allow namespaces per volumes, and this
> might be a desirable feature.
>
> What else?

Wouldn't this be useful for union filesystems like OverlayFS? Or other
filesystems that support nested filesystems like bcachefs?



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