[SMB3POSIX] File attributes

[Rowland Penny]

On Tue, 14 Nov 2023 19:30:43 +1000
ronnie sahlberg via samba-technical <samba-technical at lists.samba.org>
wrote:

> On Tue, 14 Nov 2023 at 19:16, Ralph Boehme via samba-technical
> <samba-technical at lists.samba.org> wrote:
> >
> > On 11/13/23 18:50, Jeremy Allison wrote:
> > > On Mon, Nov 13, 2023 at 12:28:18PM +0100, Ralph Boehme wrote:
> > >> We had support for file atttributes in the CIFS UNIX extensions,
> > >> this is currently not in the spec (or code) for SMB3 POSIX.
> > >>
> > >> Is this intentional? What is the reason?
> > >
> > > Do you mean the attributes listed by:
> > >
> > > man chattr.
> >
> > yes.
> >
> > > chattr - change file attributes on a Linux file system
> > >
> > > This was at the insitence of Steve as I recall.
> >
> > adding Steve to the loop.
> >
> > > We never implemented this.
> > >
> > > Might be done via a tunnelling ioctl ? Other thoughts ?
> >
> > well, it's a rabbit hole of its own and still seem to be rarely
> > used on Linux and the BSDs. It's not POSIX anyway so just declare
> > it out of scope for now?
> 
> Not to derail, but "chattr +i" is not a rabbithole. It is very much
> real. If you are going to set up and run bind locally on a
> systemd-resolved infected system
> you literally must use chattr +i to stop it from ruining your
> /etc/resolv.conf

Ah, no, in my opinion and experience, the best way to stop
systemd-resolved from altering /etc/resolv.conf, is to remove
systemd-resolved.

If you have to make a file immutable, then there are problems
elsewhere.

Rowland

> 
> >
> > The Linux interface is via ioctls so doing it over the wire via SMB2
> > IOCTLs looks like a good way forward allowing us to ignore this for
> > now and possibly add it later if there's demand and resources to
> > implement it.
> >
> > -slow
>