CIFS: implement get_dfs_refer for SMB2+
in SMB2+ the get_dfs_refer operation uses a FSCTL. The request can be made on any Tree Connection according to the specs. Since Samba only accepted it on an IPC connection until recently, try that first. https://lists.samba.org/archive/samba-technical/2017-February/118859.html 3.2.4.20.3 Application Requests DFS Referral Information: > The client MUST search for an existing Session and TreeConnect to any > share on the server identified by ServerName for the user identified by > UserCredentials. If no Session and TreeConnect are found, the client > MUST establish a new Session and TreeConnect to IPC$ on the target > server as described in section 3.2.4.2 using the supplied ServerName and > UserCredentials. Signed-off-by: Aurelien Aptel <aaptel@suse.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com>
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