cifs: add refcounted and timestamped container for holding tcons
Eventually, we'll need to track the use of tcons on a per-sb basis, so that we know when it's ok to tear them down. Begin this conversion by adding a new "tcon_link" struct and accessors that get it. For now, the core data structures are untouched -- cifs_sb still just points to a single tcon and the pointers are just cast to deal with the accessor functions. A later patch will flesh this out. Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
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