linux-kernel - Re: [PATCH -next v3 5/7] md: factor out a helper rdev_is_spare() from remove_and_add

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Date:   Wed, 23 Aug 2023 10:20:46 +0800
From:   Xiao Ni <xni@...hat.com>
To:     Yu Kuai <yukuai1@...weicloud.com>
Cc:     song@...nel.org, mariusz.tkaczyk@...ux.intel.com,
        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 5/7] md: factor out a helper rdev_is_spare() from remove_and_add_spares()

On Sun, Aug 20, 2023 at 5:13 PM Yu Kuai <yukuai1@...weicloud.com> wrote:
>
> From: Yu Kuai <yukuai3@...wei.com>
>
> There are no functional changes, just to make the code simpler and
> prepare to delay remove_and_add_spares() to md_start_sync().
>
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> ---
>  drivers/md/md.c | 15 ++++++++++-----
>  1 file changed, 10 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index ceace5ffadd6..11d27c934fdd 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -9169,6 +9169,14 @@ static bool rdev_removeable(struct md_rdev *rdev)
>         return true;
>  }
>
> +static bool rdev_is_spare(struct md_rdev *rdev)
> +{
> +       return !test_bit(Candidate, &rdev->flags) && rdev->raid_disk >= 0 &&
> +              !test_bit(In_sync, &rdev->flags) &&
> +              !test_bit(Journal, &rdev->flags) &&
> +              !test_bit(Faulty, &rdev->flags);
> +}
> +
>  static int remove_and_add_spares(struct mddev *mddev,
>                                  struct md_rdev *this)
>  {
> @@ -9217,13 +9225,10 @@ static int remove_and_add_spares(struct mddev *mddev,
>         rdev_for_each(rdev, mddev) {
>                 if (this && this != rdev)
>                         continue;
> +               if (rdev_is_spare(rdev))
> +                       spares++;
>                 if (test_bit(Candidate, &rdev->flags))
>                         continue;

Hi Kuai

Why not put rdev_is_spare after testing Candidate?

Best Regards
Xiao

> -               if (rdev->raid_disk >= 0 &&
> -                   !test_bit(In_sync, &rdev->flags) &&
> -                   !test_bit(Journal, &rdev->flags) &&
> -                   !test_bit(Faulty, &rdev->flags))
> -                       spares++;
>                 if (rdev->raid_disk >= 0)
>                         continue;
>                 if (test_bit(Faulty, &rdev->flags))
> --
> 2.39.2
>