tree c6d444c0e8226778f8b40a7f5be21433549bfe37
parent a5c590667f150e257368cab46f26970670298e4d
author Patrick Venture <venture@google.com> 1541809373 -0800
committer Patrick Venture <venture@google.com> 1542314931 -0800

session: add per session state information

Each session object has state.  The state here refers to what is
currently taking place on that specific object -- hash or image.
Whether it's open and being written to, or closed.  Closed is not the
same as deleted.  The sessions objects are tied to the two available
objects and not the blob session handles.

Change-Id: I722531fe334863ac310506fd011b24eb36a95f90
Signed-off-by: Patrick Venture <venture@google.com>