On Wed, 7 Feb 2007 12:30:39 +1100
Neil Brown <[email protected]> wrote:
> On Tuesday February 6, [email protected] wrote:
> > On Wed, 7 Feb 2007 10:26:56 +1100
> > Neil Brown <[email protected]> wrote:
> >
> > > +static int bio_fits_rdev(struct bio *bi)
> > > +{
> > > + request_queue_t *q = bdev_get_queue(bi->bi_bdev);
> > > +
> > > + if ((bi->bi_size>>9) > q->max_sectors)
> > > + return 0;
> > > + blk_recount_segments(q, bi);
> > > + if (bi->bi_phys_segments > q->max_phys_segments ||
> > > + bi->bi_hw_segments > q->max_hw_segments)
> > > + return 0;
> > > +
> > > + if (q->merge_bvec_fn)
> > > + /* it's too hard to apply the merge_bvec_fn at this stage,
> > > + * just just give up
> > > + */
> > > + return 0;
> > > +
> > > + return 1;
> > > +}
> >
> > Isn't think going to return 0 rather a lot of the time?
>
> Why do you say that?
Because I was too lazy to go off and work out who's setting merge_bvec_fn.
> merge_bvec_fn is only set for dm, md, pktcdvd.c so what won't cause a
> zero in real-world cases (it rarely makes sense to put a raid5 on top
> of those things).
OK. Hopefully it'll stay that way...
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