OpenAFS Master Repository branch, master, updated. openafs-devel-1_5_76-3687-gba78ac6

[Gerrit Code Review]

The following commit has been merged in the master branch:
commit ba78ac675c2a90359dedc9cf16e38e6d7e606eaf
Author: Jeffrey Altman <jaltman@your-file-system.com>
Date:   Tue Apr 2 00:46:27 2013 -0400

    Windows: AFSPrimaryVolumeWorkerThread reorg
    
    Periodically there is a lost race which results in a valid DirectoryCB
    with a non-NULL ObjectInformation pointer that refers to freed memory.
    This major reorganization simplifies the logic and attempts to close
    potential loopholes.
    
    First, the AFSExamineDirectory() function is removed and replaced by
    a call to AFSDeleteDirEntry().  The AFSExamineDirectory() function
    examined all of the children AFSObjectInfoCB objects which in turn
    duplicated much of the logic of AFSExamineObjInfo at the cost of
    increased complexity due to the additional layer of locked objects.
    Once the AFSDirectoryCB is removed a subsequent pass of the worker
    thread will free the AFSObjectInfoCBs.
    
    Second, the AFS_OBJECT_REFERENCE_DIRENTRY category had been used for
    both DirectoryCB references and the Pioctl references.  A new
    AFS_OBJECT_REFERENCE_PIOCTL category has been created to improve the
    ability to track the allocations and releases.
    
    Third, the AFSPrimaryVolumeWorker thread now attempts to hold onto the
    VolumeCB TreeLock exclusively.  Previously the lock was held shared.
    However, it is not safe for both the garbage collection and the find
    routines to both be shared.  One has to be exclusive.  Although holding
    the TreeLock exclusively in the garbage collection processing will result
    in the lock being held for extended periods of time, it is more likely
    that there will be benefits from parallel access during AFSFindObjectInfo()
    calls.
    
    Attempts to obtain most other locks are non-blocking.  If the lock cannot
    be obtained, the object must be in use.  Therefore, it should not be
    garbage collected.
    
    Change-Id: I75e0302c1737aadfbd9afc0c8a03e28513e785f5
    Reviewed-on: http://gerrit.openafs.org/9720
    Tested-by: BuildBot <buildbot@rampaginggeek.com>
    Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
    Tested-by: Jeffrey Altman <jaltman@your-file-system.com>

 src/WINNT/afsrdr/kernel/lib/AFSGeneric.cpp       |  200 ++++---
 src/WINNT/afsrdr/kernel/lib/AFSVolume.cpp        |   18 +-
 src/WINNT/afsrdr/kernel/lib/AFSWorker.cpp        |  681 ++++++++++------------
 src/WINNT/afsrdr/kernel/lib/Include/AFSDefines.h |    3 +-
 4 files changed, 425 insertions(+), 477 deletions(-)

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