Re: [PATCH] 2.5.67-ac2 direct-IO for IDE taskfile ioctl (0/4)

[Alan Cox]

On Mer, 2003-04-23 at 23:35, Andrew Morton wrote:
> Dumb question: what does all this code actually do?
> 
> It appears to be implementing an IDE-specific ioctl() which performs bulk
> IO direct to/from userspace.  But that seems to be equivalent to O_DIRECT
> access to /dev/hda.
> 
> What is special about the IDE ioctl approach?

Think /dev/sg at the ATA level