[PATCH] Add support for setting owner info, dos attributes, and create time

[Boris Protopopov]

OK, I will look into adding ctime-related attribute, and model it after btime.

On Mon, Jan 13, 2020 at 3:36 PM Jeremy Allison <jra at samba.org> wrote:
>
> On Mon, Jan 13, 2020 at 01:26:39PM -0700, Andreas Dilger via samba-technical wrote:
> > On Jan 9, 2020, at 12:10 PM, Steve French <smfrench at gmail.com> wrote:
> > >
> > > One loosely related question ...
> > >
> > > Your patch adds the ability to set creation time (birth time) which
> > > can be useful for backup/restore cases, but doesn't address the other
> > > hole in Linux (the inability to restore a files ctime).
> > >
> > > In Linux the ability to set timestamps seems quite limited (utimes
> > > only allows setting mtime and atime).
> >
> > The whole point of not being able to change ctime and btime as a regular
> > user is so that it is possible to determine when a file was actually
> > created on the filesystem and last modified.  That is often useful for
> > debugging or forensics reasons.
> >
> > I think if this is something that SMB/CIFS wants to do, it should save
> > these attributes into an xattr of its own (e.g. user.dos or whatever),
> > rather than using the ctime and btime(crtime) fields in the filesystem.
>
> FYI, we (Samba) already do this for create time to store/fetch it
> on systems and filesystems that don't store a create time. It's
> easy to add extra info here.