On Feb 13, 10:24am, Oliver Neukum wrote:
>
> > We currently support a RAID which uses vendor unique commands to do
> > device management. We need special versions of drivers that understand
> > the implied direction of the vendor unique commands. Under Irix, the
> > ds interface explicitly specifies a direction, so no driver code need
> > be changed to support this device.
>
> That's the problem. You'd break the interface.
> Nevertheless, it should be done in 2.5.
What if two bits were used:
0 = direction implied
1 = read from device
2 = write to device
3 = reserved/bidirectional
Then you could maintain compatibility as long as older programs zero
out the unused flags bits.
jeremy
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