[Bug 3242] New: need NFS-*unsafe* locker for unix

[bu...@bugzilla.spamassassin.org]

http://bugzilla.spamassassin.org/show_bug.cgi?id=3242

           Summary: need NFS-*unsafe* locker for unix
           Product: Spamassassin
           Version: SVN Trunk (Latest Devel Version)
          Platform: Other
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Libraries
        AssignedTo: spamassassin-dev@incubator.apache.org
        ReportedBy: jm@jmason.org


We're currently using NFS-safe locking code for the bayes dbs on UNIX platforms.
 This is very wastefully slow when NFS is not in use.   We should provide a
simple fcntl-based locker for the "dbs on local fs only" case.

Can this locker be used by default?   What's the lock-safety status of modern
NFS impls?

If it's still pretty unsafe, we'll have to keep the nfs-safe version the
default, and activate this if the user specifies a config param.   (note that
activating it if the fs is mounted as a non-NFS fstype is still not a safe
assumption, since the setup could be that 1 scanning machine hosts the fs and
several others use the same fs over nfs.)



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