All,

Attached is a smallpatch which implements the HDIO_GET/SET_BUSSTATE
ioctls.  These ioctl numbers were added as part of a previous patch I sent,
but the actual use of them did not get included.  

This adds support for the two ioctls and adds a hwif struct member to track
current state and a method to change the bus state.  This code is a key
part of hot-swappable IDE.

We've been using it for months without problems. Please patch this in for
the next 2.4.x.

Tim
-- 
Tim Hockin
Systems Software Engineer
Sun Microsystems, Cobalt Server Appliances
thockin@sun.com