[Bugs] [Bug 1397406] New: glfs_fini does not send parent down on inactive graphs.

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1397406

            Bug ID: 1397406
           Summary: glfs_fini does not send parent down on inactive
                    graphs.
           Product: GlusterFS
           Version: mainline
         Component: libgfapi
          Assignee: bugs at gluster.org
          Reporter: rjoseph at redhat.com
        QA Contact: sdharane at redhat.com
                CC: bugs at gluster.org



Description of problem:
At a time we maintain three graphs - active_subvol, next_subvol and 
mip_subvol (migration-in-progress). A new graph move from next_subvol -> 
mip_subvol -> active_subvol when glfs_active_subvol function is called. Before 
every fop we call glfs_active_subvol to make sure the fop goes to the correct 
graph.

when glfs_init is called the new graph is assigned to next_subvol and from
glfs_init we call glfs_active_subvol. Which will migrate the graph. But if
for some reason the mirgation fails, e.g. the first lookup on the "/" dir
fails then we would be left with a state where mip_subol is pointed to the
current graph and both active_subvol and next_subvol is NULL.

In glfs_fini we only send GF_EVENT_PARENT_DOWN to active_subvol and if it
is NULL we go ahead and delete fs and the corresponding ctx. This could
create some problem and also we might not free up used resources.


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