I have made a ton of changes to HAMMER's flusher which I hope will
improve filesystem access during heavy I/O operations like rm -rf's,
cpdup's, big copies, etc.
I also made a few adjustments to the nata driver's queueing code.
Some testing of HAMMER would be great. My biggest concern is that
I may have left a hole open where the kmalloc pool can get blown
out again.
-Matt
