CIFS: add build_path_from_dentry_optional_prefix()
this function does the same thing as add build_path_from_dentry() but takes a boolean parameter to decide whether or not to prefix the path with the tree name. we cannot rely on tcon->Flags & SMB_SHARE_IS_IN_DFS for SMB2 as smb2 code never sets tcon->Flags but it sets tcon->share_flags and it seems the SMB_SHARE_IS_IN_DFS has different semantics in SMB2: the prefix shouldn't be added everytime it was in SMB1. Signed-off-by: NAurelien Aptel <aaptel@suse.com> Acked-by: NPavel Shilovsky <pshilov@microsoft.com> Signed-off-by: NSteve French <smfrench@gmail.com>
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