Displaying streams as xattrs

[ronnie sahlberg]

We want to expose ADS to the applications?
Maybe FCNTL is a better interface to do this than magix xattrs.
An application could open a file, and then use fcntl to
list/open/create/delete streams?

We should talk to the NTFS maintainers too as this is an ntfs feature
and they might alwo want to expose ADS to apps.
So we get a solution that we can use across multiple filesystems.

regards
ronnie s



On Mon, 22 May 2023 at 16:40, Steve French <smfrench at gmail.com> wrote:
>
> On Sun, May 21, 2023 at 11:33 PM ronnie sahlberg
> <ronniesahlberg at gmail.com> wrote:
> >
> > A problem  we have with xattrs today is that we use EAs and these are
> > case insensitive.
> > Even worse I think windows may also convert the names to uppercase :-(
> > And there is no way to change it in the registry :-(
>
> But for alternate data streams if we allowed them to be retrieved via xattrs,
> would case sensitivity matter?  Alternate data streams IIRC are already
> case preserving.   Presumably the more common case is for a Linux user
> to read (or backup) an existing alternate data stream (which are usually
> created by Windows so case sensitivity would not be relevant).
>
> > On Mon, 22 May 2023 at 12:09, Steve French via samba-technical
> > <samba-technical at lists.samba.org> wrote:
> > >
> > > Looking through code today (in fs/cifs/xattr.c) I noticed an old
> > > reference to returning alternate data streams as pseudo-xattrs.
> > > Although it is possible to list streams via "smbinfo filestreaminfo"
> > > presumably it is not common (opening streams on remote files from
> > > Linux is probably not done as commonly as it should be as well).
> > >
> > > Any thoughts about returning alternate data streams via pseudo-xattrs?
> > > Macs apparently allow this (see e.g.
> > > https://www.jankyrobotsecurity.com/2018/07/24/accessing-alternate-data-streams-from-a-mac/)
> > >
> > >
> > >
> > >
> > >
> > > --
> > > Thanks,
> > >
> > > Steve
> > >
>
>
>
> --
> Thanks,
>
> Steve