From: Dave Olien <dmo@osdl.org>

The DAC960 driver uses an ugly overloading of the O_NONBLOCK flag to
support the controller's RAID configuration features.

Opening "/dev/rd/c0d0" with the O_NONBLOCK flag set returns a file
descriptor that can be used to do RAID control operations using ioctl().
The normal ioctl operations are not availabe with that file descriptor.

This patch removes that O_NONBLOCK overloading from DAC960_open() and
DAC960_ioctl() functions.  It introduces a new "miscellaneous" device
named /dev/dac960_gam.  It uses minor device number 252 of the miscellaneous
character devices.

The currently distrubted "Global Array Manager" server distrubted by
LSIlogic on their web page page works only on RH7.3 or earlier.  It doesn't
work under RH9.  There are probably some library incompatabilities.
So, I don't view this patch as breaking anything that currently works.
If this software package is ever brought up to date (which I doubt),
then it can be modified to use this new device at that time.