Change object "refcounts" to be dgets instead of igets, where possible,

Change object "refcounts" to be dgets instead of igets, where possible,
because igets are not only more expensive (need to lock the inode, etc),
but you need to do the dentry lookup to find the inode in the first place.

Also cleaned up access to atomic counters to use "atomic_read(count)"
instead of count.value.  Purely cosmetic, since we don't really need
the atomicness of the counters for debug output.