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SubjectRe: Possibly wrong BIO usage in ide_multwrite
On Mon, Jan 05 2004, Bartlomiej Zolnierkiewicz wrote:
> On Monday 05 of January 2004 17:49, Jens Axboe wrote:
> > On Mon, Jan 05 2004, Bartlomiej Zolnierkiewicz wrote:
> > > > calling end_request with a null sector count, ide_end_request will then
> > > > take hard_nr_sectors which will end the whole request even if only one
> > > > bio was finished, huh? Am I missing something here?
> > >
> > > No, it is used mainly to fail requests.
> > >
> > > This hack should be later removed with care
> > > (there is some strange comment about locking).
> >
> > IIRC, it's due to it not always being safe to inspect rq state outside
> > of ide_lock. So that makes 0 a magic value that just means 'end the
> > first chunk' for ide_end_request().
>
> Why/when it is not safe to do?

You would need to read hwgroup->rq.

--
Jens Axboe

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