[RFC PATCH 1/2] block: add simple copy support

[Selva Jove]

Thanks for reporting the memory leak. Will add a fix.

On Tue, Dec 1, 2020 at 3:58 PM Aleksei Marov <alekseymmm at mail.ru> wrote:
>
> On Tue, 2020-12-01 at 11:09 +0530, SelvaKumar S wrote:
> > +     ret = __blkdev_issue_copy(bdev, dest, nr_srcs, rlist, gfp_mask, flags,
> > +                     &bio);
> > +     if (!ret && bio) {
> > +             ret = submit_bio_wait(bio);
> > +             if (ret == -EOPNOTSUPP)
> > +                     ret = 0;
> > +
> > +             kfree(page_address(bio_first_bvec_all(bio)->bv_page) +
> > +                             bio_first_bvec_all(bio)->bv_offset);
> > +             bio_put(bio);
> > +     }
> > +
> > +     return ret;
> > +}
> I think  there is an issue here that if bio_add_page  returns error in
> __blkdev_issue_copy then ret is -ENOMEM and we never do bio_put for bio
> allocated in  __blkdev_issue_copy so it is small memory leak.
>
>