From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?utf-8?Q?Aur=C3=A9lien?= Aptel <aaptel-IBi9RG/b67k@public.gmane.org>
Subject: Re: Does linux smb2 client supports DFS capability?
Date: Thu, 12 Oct 2017 10:41:24 +0200
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Cc: samba-technical <samba-technical-w/Ol4Ecudpl8XjKLYN78aQ@public.gmane.org>,
        "linux-cifs\@vger.kernel.org" <linux-cifs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
        Hemanth Thummala <hemanth.thummala-8cO4VLV/4DJBDgjK7y7TUQ@public.gmane.org>
To: Richard Sharpe <realrichardsharpe-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
        Steve French <smfrench-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
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Richard Sharpe <realrichardsharpe-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
> I think their real interest is in the CIFS FS getting DFS referrals if
> STATUS_PATH_NOT_COVERED is returned on a CREATE.
>
> When I last looked the client could not do that.

cifs.ko should be able to traverse a DFS link on the FS, after the DFS
mounted. My testing setup when I worked on this was the following:

//A/root
       |
       +- link -> //B/target
       +- sublink -> //B/target/sub

//B/target
       |
       + sub/
          |
          + dir/
              |
              + files..

And I had a script
- mounting //A/root and running cd&ls in /, /link, /link/sub,
  /link/sub/dir, /sublink, /sublink/dir
- mounting //A/root/link and running cd&ls in /, /sub, /sub/dir
- mounting //A/root/link/sub and running cd&ls in /, /dir
- mounting //A/root/sublink and running cd&ls in /, /dir
- mounting //A/root/sublink/dir and running cd&ls in /

And all worked for vers={1.0,3.0}, A being {samba, Windows Server 2016},
B being {samba, Windows Server 2012 R2} when I submitted the patches.

-- 
Aurélien Aptel / SUSE Labs Samba Team
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SUSE Linux GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)