linux-kernel - Re: [RFC PATCH v4 1/3] block: export bio_map

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Date:   Mon, 4 Jan 2021 18:12:39 +0530
From:   Selva Jove <selvajove@...il.com>
To:     Damien Le Moal <Damien.LeMoal@....com>
Cc:     SelvaKumar S <selvakuma.s1@...sung.com>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "kbusch@...nel.org" <kbusch@...nel.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        Johannes Thumshirn <Johannes.Thumshirn@....com>,
        "hch@....de" <hch@....de>, "sagi@...mberg.me" <sagi@...mberg.me>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        "bvanassche@....org" <bvanassche@....org>,
        "mpatocka@...hat.com" <mpatocka@...hat.com>,
        "hare@...e.de" <hare@...e.de>,
        "dm-devel@...hat.com" <dm-devel@...hat.com>,
        "snitzer@...hat.com" <snitzer@...hat.com>,
        "nj.shetty@...sung.com" <nj.shetty@...sung.com>,
        "joshi.k@...sung.com" <joshi.k@...sung.com>,
        "javier.gonz@...sung.com" <javier.gonz@...sung.com>
Subject: Re: [RFC PATCH v4 1/3] block: export bio_map_kern()

Thanks Damien, Will update that.

On Mon, Jan 4, 2021 at 5:45 PM Damien Le Moal <Damien.LeMoal@....com> wrote:
>
> On 2021/01/04 19:48, SelvaKumar S wrote:
> > Export bio_map_kern() so that copy offload emulation can use
> > it to add vmalloced memory to bio.
> >
> > Signed-off-by: SelvaKumar S <selvakuma.s1@...sung.com>
> > ---
> >  block/blk-map.c        | 3 ++-
> >  include/linux/blkdev.h | 2 ++
> >  2 files changed, 4 insertions(+), 1 deletion(-)
> >
> > diff --git a/block/blk-map.c b/block/blk-map.c
> > index 21630dccac62..50d61475bb68 100644
> > --- a/block/blk-map.c
> > +++ b/block/blk-map.c
> > @@ -378,7 +378,7 @@ static void bio_map_kern_endio(struct bio *bio)
> >   *   Map the kernel address into a bio suitable for io to a block
> >   *   device. Returns an error pointer in case of error.
> >   */
> > -static struct bio *bio_map_kern(struct request_queue *q, void *data,
> > +struct bio *bio_map_kern(struct request_queue *q, void *data,
> >               unsigned int len, gfp_t gfp_mask)
> >  {
> >       unsigned long kaddr = (unsigned long)data;
> > @@ -428,6 +428,7 @@ static struct bio *bio_map_kern(struct request_queue *q, void *data,
> >       bio->bi_end_io = bio_map_kern_endio;
> >       return bio;
> >  }
> > +EXPORT_SYMBOL(bio_map_kern);
>
> Simple copy support is a block layer code, so you I do not think you need this.
> You only need to remove the static declaration of the function.
>
> >
> >  static void bio_copy_kern_endio(struct bio *bio)
> >  {
> > diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> > index 070de09425ad..81f9e7bec16c 100644
> > --- a/include/linux/blkdev.h
> > +++ b/include/linux/blkdev.h
> > @@ -936,6 +936,8 @@ extern int blk_rq_map_user(struct request_queue *, struct request *,
> >                          struct rq_map_data *, void __user *, unsigned long,
> >                          gfp_t);
> >  extern int blk_rq_unmap_user(struct bio *);
> > +extern struct bio *bio_map_kern(struct request_queue *q, void *data,
> > +                             unsigned int len, gfp_t gfp_mask);
> >  extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
> >  extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
> >                              struct rq_map_data *, const struct iov_iter *,
> >
>
>
> --
> Damien Le Moal
> Western Digital Research