Re: [PATCH] IDE update for 2.6.7-rc3 [11/12]

[Bartlomiej Zolnierkiewicz]

On Friday 11 of June 2004 19:01, Jens Axboe wrote:
> On Fri, Jun 11 2004, Bartlomiej Zolnierkiewicz wrote:
> > [PATCH] ide: kill task_[un]map_rq()
> >
> > PIO handlers under CONFIG_IDE_TASKFILE_IO=n are never used for bio
> > based requests (rq->bio is always NULL) so we can use rq->buffer
> > directly instead of calling ide_[un]map_buffer().
>
> Not so sure if it's ever used for something requiring performance, and
> even if it isn't then it may still be worth it to keep the mapping and
> instead fix the task setup to map in user data with blk_rq_map_user() by
> fixing up ide_taskfile_ioctl().

I agree about blk_rq_map_user() (I even did it once around 2.5.60-70).
However I think that we are better off (slowly) killing old taskfile
handlers completely (this patch is for old taskfile handlers only)
and using CONFIG_IDE_TASKFILE_IO versions (which know about rq->bio).

> It would make HDIO_DRIVE_TASKFILE a whole lot nicer.

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