[bio] IOCtl to test whether the device is in linear mode.
[bio] IOCtl to test whether the device is in linear mode.

littlekernel/lk,minglun-tsai/lk,littlekernel/lk,hollanderic/lkstuff,travisg/lk,minglun-tsai/lk,minglun-tsai/lk,hollanderic/lkstuff,minglun-tsai/lk,travisg/lk,hollanderic/lkstuff,travisg/lk,hollanderic/lkstuff,littlekernel/lk,littlekernel/lk,travisg/lk