On Wed, Mar 25, 2009 at 01:06:15AM +0900, Tejun Heo wrote:
> Impact: unify request data buffer handling
>
> rq->data is used mostly to pass kernel buffer through request queue
> without using bio. There are only a couple of places which still do
> this in kernel and converting to bio isn't difficult.
>
> This patch converts ide-atapi to use bio instead of rq->data. For
> ide_queue_pc_tail() which can block, blk_rq_map_kern() is used. For
> ide_queue_pc_head() which is used for request sense and called from
> atomic context, drive->request_sense_bio and ->request_sense_bvec[2]
> are added and used via bio_map_kern_prealloc().
>
> ide-tape is updated to map sg for special requests.
>
> This change makes all ide-atapi commands except for tape bh ones use
> bio. Drop tp_ops->output/input_data path from ide_pc_intr().
>
> Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
> Cc: Jens Axboe <axboe@xxxxxxxxx>
Acked-by: Borislav Petkov <petkovbb@xxxxxxxxx>
--
Regards/Gruss,
Boris.
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