linux-kernel - Re: [RFC PATCH] vfs: syscalls: Add create_automount() and remove

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Date:   Wed, 19 Feb 2020 11:07:28 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     David Howells <dhowells@...hat.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Al Viro <viro@...iv.linux.org.uk>, coda@...cmu.edu,
        linux-afs@...ts.infradead.org, CIFS <linux-cifs@...r.kernel.org>,
        "open list:NFS, SUNRPC, AND..." <linux-nfs@...r.kernel.org>,
        linux-btrfs <linux-btrfs@...r.kernel.org>,
        Linux FS Devel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH] vfs: syscalls: Add create_automount() and remove_automount()

On Wed, Feb 19, 2020 at 10:55 AM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> Why don't you just use mkdir with S_ISVTX set, or something like that?

Actually, since this is apparently a different filetype, the _logical_
thing to do is to use "mknod()".

Yes, yes, it will require a new case (and maybe a per-filesystem
callback or a flag or something) in "may_mknod()" and "do_mknodat()"
to let those new kinds through, but it sounds like mknod() is actually
what you're doing.

You presumably need a new type _anyway_ for stat() and/or the filldir
d_type field. Or do you always want to make it look exactly like a
directory to all user space?

                  Linus