Re: [PATCH Linux 2.6.12-rc5-mm2 08/09] blk: update IDE to use the new blk_ordered.

[Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>]

On 6/5/05, Jeff Garzik <jgarzik@pobox.com> wrote:
> Tejun Heo wrote:
> > @@ -176,6 +176,18 @@ static ide_startstop_t __ide_do_rw_disk(
> >                       lba48 = 0;
> >       }
> >
> > +     if (blk_fua_rq(rq) &&
> > +         (!rq_data_dir(rq) || !drive->select.b.lba || !lba48)) {
> > +             if (!rq_data_dir(rq))
> > +                     printk(KERN_WARNING "%s: FUA READ unsupported\n",
> > +                            drive->name);
> > +             else
> > +                     printk(KERN_WARNING "%s: FUA request received but "
> > +                            "cannot use LBA48\n", drive->name);
> > +             ide_end_request(drive, 0, 0);
> > +             return ide_stopped;
> > +     }
> > +
> 
> 
> Does this string of tests really need to be added to the main fast path?
> 
> It would be better to simply guarantee that this check need never exist
> in the IDE driver, by guaranteeing that the block layer will never send
> a FUA-READ command to a driver that does not wish it.
> 
>         Jeff

Seconded, plus please use <linux/ata.h> instead of <linux/hdreg.h>
for adding new opcodes.