mount.cifs on Win2k8 DFS servers

[Jeff Layton]

On Mon, 17 Oct 2011 13:58:46 +0200
Gerlando Falauto <gerlando.falauto at keymile.com> wrote:

> Hi,
> 
> my CIFS kernel module (linux 2.6.39.3) fails to mount DFS trees from 
> Win2k8 servers.
> 

I believe this was fixed in 3.0. You should test a later kernel...

> Whereas upon "Tree Connect AndX Request"s (for a DFS tree) Win2k3 used 
> to reply with STATUS_PATH_NOT_COVERED, Win2k8 now answers with 
> STATUS_BAD_NETWORK_NAME, pretty much the same thing it would say about a 
> non-existing share.
> 
> This is somewhat related to:
> https://bugzilla.samba.org/show_bug.cgi?id=8003
> but in fact only affects cifs-fs and NOT smbclient which works fine for me.
> 
> In fact, Windows machines (and smbclient, for that matter) don't ever 
> try connecting the tree, as they both start off with a "Trans2 Request" 
> GET_DFS_REFERRAL.
> 
> Excerpt from source3/libsmb/clidfs.c:
> === CUT ===
>      /* here's the fun part....to support 'msdfs proxy' shares
>        (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
>         here before trying to connect to the original share.
>         cli_check_msdfs_proxy() will fail if it is a normal share. */
> 
>      if ((cli_state_capabilities(c) & CAP_DFS) &&
> === CUT ===
> 
> Now, I came up with a workaround (which I would not post here in order 
> not to be yelled at...) for cifs-fs which simply treats 
> NT_STATUS_BAD_NETWORK_NAME as NT_STATUS_PATH_NOT_COVERED, but I guess we 
> need a better solution.
> 
> What should be the be best approach for facing this?
> Detecting the server has DFS capabilities and start getting DFS 
> referrals to begin with?
> Has this been discussed in the past? I find it hard to believe that no 
> one has reported this problem before...
> 
> Thanks!
> Gerlando
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-- 
Jeff Layton <jlayton at poochiereds.net>