|  -l on / or ls in /mnt will lock root. Then everything stops. It's called
|  the race for root and in why you never want to hang onto a vnode lock for
|  long.

  As a stopgap measure, could we check in ioflush if someone else wants
the vnode lock every now and then, and if so, give up flushing and release
the lock, or will bad things <tm> happen?

	mjl