linux-kernel - Re: [RFC PATCH 2/3] add statmnt(2) syscall

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Message-ID: <CAOssrKfS79=+F0h=XPzJX2E6taxAPmEJEYPi4VBNQjgRR5ujqw@mail.gmail.com>
Date:   Mon, 18 Sep 2023 16:14:02 +0200
From:   Miklos Szeredi <mszeredi@...hat.com>
To:     Christian Brauner <brauner@...nel.org>
Cc:     Miklos Szeredi <miklos@...redi.hu>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-api@...r.kernel.org, linux-man@...r.kernel.org,
        linux-security-module@...r.kernel.org, Karel Zak <kzak@...hat.com>,
        Ian Kent <raven@...maw.net>,
        David Howells <dhowells@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <christian@...uner.io>,
        Amir Goldstein <amir73il@...il.com>
Subject: Re: [RFC PATCH 2/3] add statmnt(2) syscall

On Mon, Sep 18, 2023 at 3:51 PM Christian Brauner <brauner@...nel.org> wrote:

> I really would prefer a properly typed struct and that's what everyone
> was happy with in the session as well. So I would not like to change the
> main parameters.

I completely  agree.  Just would like to understand this point:

  struct statmnt *statmnt(u64 mntid, u64 mask, unsigned int flags);

What's not properly typed about this interface?

I guess the answer is that it's not a syscall interface, which will
have an added [void *buf, size_t bufsize], while the buffer sizing is
done by a simple libc wrapper.

Do you think that's a problem?  If so, why?

Thanks,
Miklos