linux-kernel - Re: [PATCH -next v3 3/7] md/raid1-10: factor out a helper to submit normal write

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Date:   Wed, 31 May 2023 15:20:59 +0800
From:   Xiao Ni <xni@...hat.com>
To:     Yu Kuai <yukuai1@...weicloud.com>
Cc:     song@...nel.org, neilb@...e.de, akpm@...l.org,
        linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
        yukuai3@...wei.com, yi.zhang@...wei.com, yangerkun@...wei.com
Subject: Re: [PATCH -next v3 3/7] md/raid1-10: factor out a helper to submit
 normal write

On Mon, May 29, 2023 at 9:14 PM Yu Kuai <yukuai1@...weicloud.com> wrote:
>
> From: Yu Kuai <yukuai3@...wei.com>
>
> There are multiple places to do the same thing, factor out a helper to
> prevent redundant code, and the helper will be used in following patch
> as well.
>
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> ---
>  drivers/md/raid1-10.c | 17 +++++++++++++++++
>  drivers/md/raid1.c    | 13 ++-----------
>  drivers/md/raid10.c   | 26 ++++----------------------
>  3 files changed, 23 insertions(+), 33 deletions(-)
>
> diff --git a/drivers/md/raid1-10.c b/drivers/md/raid1-10.c
> index 9bf19a3409ce..506299bd55cb 100644
> --- a/drivers/md/raid1-10.c
> +++ b/drivers/md/raid1-10.c
> @@ -110,6 +110,23 @@ static void md_bio_reset_resync_pages(struct bio *bio, struct resync_pages *rp,
>         } while (idx++ < RESYNC_PAGES && size > 0);
>  }
>
> +
> +static inline void raid1_submit_write(struct bio *bio)

Hi Kuai

Is it better to change the name to rdev_submit_write? It's just a
suggestion. The patch looks good to me.

Regards
Xiao

> +{
> +       struct md_rdev *rdev = (struct md_rdev *)bio->bi_bdev;
> +
> +       bio->bi_next = NULL;
> +       bio_set_dev(bio, rdev->bdev);
> +       if (test_bit(Faulty, &rdev->flags))
> +               bio_io_error(bio);
> +       else if (unlikely(bio_op(bio) ==  REQ_OP_DISCARD &&
> +                         !bdev_max_discard_sectors(bio->bi_bdev)))
> +               /* Just ignore it */
> +               bio_endio(bio);
> +       else
> +               submit_bio_noacct(bio);
> +}
> +
>  static inline bool raid1_add_bio_to_plug(struct mddev *mddev, struct bio *bio,
>                                       blk_plug_cb_fn unplug)
>  {
> diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
> index e86c5e71c604..0778e398584c 100644
> --- a/drivers/md/raid1.c
> +++ b/drivers/md/raid1.c
> @@ -799,17 +799,8 @@ static void flush_bio_list(struct r1conf *conf, struct bio *bio)
>
>         while (bio) { /* submit pending writes */
>                 struct bio *next = bio->bi_next;
> -               struct md_rdev *rdev = (void *)bio->bi_bdev;
> -               bio->bi_next = NULL;
> -               bio_set_dev(bio, rdev->bdev);
> -               if (test_bit(Faulty, &rdev->flags)) {
> -                       bio_io_error(bio);
> -               } else if (unlikely((bio_op(bio) == REQ_OP_DISCARD) &&
> -                                   !bdev_max_discard_sectors(bio->bi_bdev)))
> -                       /* Just ignore it */
> -                       bio_endio(bio);
> -               else
> -                       submit_bio_noacct(bio);
> +
> +               raid1_submit_write(bio);
>                 bio = next;
>                 cond_resched();
>         }
> diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
> index 18702051ebd1..6640507ecb0d 100644
> --- a/drivers/md/raid10.c
> +++ b/drivers/md/raid10.c
> @@ -909,17 +909,8 @@ static void flush_pending_writes(struct r10conf *conf)
>
>                 while (bio) { /* submit pending writes */
>                         struct bio *next = bio->bi_next;
> -                       struct md_rdev *rdev = (void*)bio->bi_bdev;
> -                       bio->bi_next = NULL;
> -                       bio_set_dev(bio, rdev->bdev);
> -                       if (test_bit(Faulty, &rdev->flags)) {
> -                               bio_io_error(bio);
> -                       } else if (unlikely((bio_op(bio) ==  REQ_OP_DISCARD) &&
> -                                           !bdev_max_discard_sectors(bio->bi_bdev)))
> -                               /* Just ignore it */
> -                               bio_endio(bio);
> -                       else
> -                               submit_bio_noacct(bio);
> +
> +                       raid1_submit_write(bio);
>                         bio = next;
>                         cond_resched();
>                 }
> @@ -1134,17 +1125,8 @@ static void raid10_unplug(struct blk_plug_cb *cb, bool from_schedule)
>
>         while (bio) { /* submit pending writes */
>                 struct bio *next = bio->bi_next;
> -               struct md_rdev *rdev = (void*)bio->bi_bdev;
> -               bio->bi_next = NULL;
> -               bio_set_dev(bio, rdev->bdev);
> -               if (test_bit(Faulty, &rdev->flags)) {
> -                       bio_io_error(bio);
> -               } else if (unlikely((bio_op(bio) ==  REQ_OP_DISCARD) &&
> -                                   !bdev_max_discard_sectors(bio->bi_bdev)))
> -                       /* Just ignore it */
> -                       bio_endio(bio);
> -               else
> -                       submit_bio_noacct(bio);
> +
> +               raid1_submit_write(bio);
>                 bio = next;
>                 cond_resched();
>         }
> --
> 2.39.2
>