With this simple dtrace script it seems that I am not getting data from args[2] 
of the io provider when a file system has forcedirectio as a mount option. 
Remove this option and the mount point or the fi_pathname will show up. Any 
idea on why args[2] doesn't get populated with directio?
Thanx
-Paul

#!/usr/sbin/dtrace -qs

io:::start
{
        @dio[args[2]->fi_mount] = count();
}

tick-1sec
{
        printa(@dio);
        clear(@dio);
}
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