[Bugs] [Bug 1170643] New: Potential race while checking/updating graph->used

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1170643

            Bug ID: 1170643
           Summary: Potential race while checking/updating graph->used
           Product: GlusterFS
           Version: mainline
         Component: fuse
          Assignee: ndevos at redhat.com
          Reporter: ndevos at redhat.com
                CC: bugs at gluster.org, gluster-bugs at redhat.com



Description of problem:
While reviewing http://review.gluster.org/#/c/9060/ we noticed that fuse
checks/modifies graph->used in a unlocked way. There is a potential race in
case when fuse_graph_setup() gets called from two different threads (currently
unlikely, but poller/notify() might change in future?).

In libgfapi we came to the conclusion that each glfs structure can be used to
protect the checking/updating of graph->used. In fuse this would be the
fuse_private_t with sync_mutex.

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