[patch 6/9] kill ide_drive_t->disk

* move ->disk from ide_drive_t to driver specific objects * make drivers allocate struct gendisk and setup rq->rq_disk (there is no need to do this for REQ_DRIVE_TASKFILE requests) * add ide_init_disk() helper and kill alloc_disks() in ide-probe.c * kill no longer needed ide_open() and

[patch 6/9] kill ide_drive_t-disk

* move -disk from ide_drive_t to driver specific objects * make drivers allocate struct gendisk and setup rq-rq_disk (there is no need to do this for REQ_DRIVE_TASKFILE requests) * add ide_init_disk() helper and kill alloc_disks() in ide-probe.c * kill no longer needed ide_open() and ide_fops[]