linux-kernel - Re: file metadata via fs API (was: [GIT PULL] Filesystem Information)

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Message-ID: <CAHk-=wgHZig-+dXQeW4pPEjdYsrq=3bgc+vUhwiT2Ox4ipLHwg@mail.gmail.com>
Date:   Tue, 11 Aug 2020 09:09:36 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Al Viro <viro@...iv.linux.org.uk>
Cc:     Miklos Szeredi <miklos@...redi.hu>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        David Howells <dhowells@...hat.com>,
        Karel Zak <kzak@...hat.com>, Jeff Layton <jlayton@...hat.com>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        Christian Brauner <christian@...uner.io>,
        Lennart Poettering <lennart@...ttering.net>,
        Linux API <linux-api@...r.kernel.org>,
        Ian Kent <raven@...maw.net>,
        LSM <linux-security-module@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: file metadata via fs API (was: [GIT PULL] Filesystem Information)

On Tue, Aug 11, 2020 at 9:05 AM Al Viro <viro@...iv.linux.org.uk> wrote:
>
> Except that you suddenly see non-directory dentries get children.
> And a lot of dcache-related logics needs to be changed if that
> becomes possible.

Yeah, I think you'd basically need to associate a (dynamic)
mount-point to that path when you start doing O_ALT. Or something.

And it might not be reasonably implementable. I just think that as
_interface_ it's unambiguous and fairly clean, and if Miklos can
implement something like that, I think it would be maintainable.

No?

                Linus