On Fri, May 18, 2012 at 09:05:11AM -0700, Tejun Heo wrote:
> Hey, Kent.
>
> On Thu, May 17, 2012 at 10:59:50PM -0400, koverstreet@xxxxxxxxxx wrote:
> > From: Kent Overstreet <koverstreet@xxxxxxxxxx>
> >
> > This consolidates some code, and will help in a later patch changing how
> > bio cloning works.
> >
> > Signed-off-by: Kent Overstreet <koverstreet@xxxxxxxxxx>
>
> I'd prefer a bit more explanation on what's going on generally and why
> and how dm conversion is different.
Well, besides the removal of idx it's all just removing stuff that
bio_clone_bioset() does for it.
> > diff --git a/drivers/md/dm.c b/drivers/md/dm.c
> > index 3cc2169..3e33039 100644
> > --- a/drivers/md/dm.c
> > +++ b/drivers/md/dm.c
> > @@ -1072,26 +1072,19 @@ static struct bio *split_bvec(struct bio *bio, sector_t sector,
> > * Creates a bio that consists of range of complete bvecs.
> > */
> > static struct bio *clone_bio(struct bio *bio, sector_t sector,
> > - unsigned short idx, unsigned short bv_count,
> > + unsigned short bv_count,
> > unsigned int len, struct bio_set *bs)
> > {
> > struct bio *clone;
> >
> > - clone = bio_alloc_bioset(GFP_NOIO, bio->bi_max_vecs, bs);
> > - __bio_clone(clone, bio);
> > + clone = bio_clone_bioset(bio, GFP_NOIO, bs);
> > clone->bi_sector = sector;
> > - clone->bi_idx = idx;
> > - clone->bi_vcnt = idx + bv_count;
> > + clone->bi_vcnt = bv_count;
> > clone->bi_size = to_bytes(len);
> > - clone->bi_flags &= ~(1 << BIO_SEG_VALID);
>
> Maybe removal of @idx deserves a separate patch?
I'm gonna back that out, I'm not sure it was correct now.
> > - if (bio_integrity(bio)) {
> > - bio_integrity_clone(clone, bio, GFP_NOIO, bs);
> > -
> > - if (idx != bio->bi_idx || clone->bi_size < bio->bi_size)
> > - bio_integrity_trim(clone,
> > - bio_sector_offset(bio, idx, 0), len);
> > - }
> > + if (bio_integrity(bio) &&
> > + clone->bi_size < bio->bi_size)
>
> Unnecessary line break.
>
> Other than that, looks good to me.
>
> Thanks.
>
> --
> tejun
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