fixing "umount -f" for the NFS client

[Mark Felder]

On Wed, Aug 28, 2013, at 19:15, Rick Macklem wrote:
> I've been doing a little more testing of "umount -f" for NFS
> mounts and they seem to be working unless some other process/thread
> has busied the file system via vfs_busy().
> 
> Unfortunately, it is pretty easy to vfs_busy() the file system
> by using a command like "df" that is stuck on the unresponsive
> NFS server.
> 

always mount your nfs with options "soft,intr" or you'll run into this
:)