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

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Message-ID: <CALTww2-gdFHh4j+_bwuT2fX_OHMFfra3p34PM4rNZv0OCqPKcw@mail.gmail.com>
Date:   Wed, 23 Aug 2023 10:28:48 +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 Wed, Aug 23, 2023 at 10:20 AM Xiao Ni <xni@...hat.com> wrote:
>
> 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

I know the answer now, Because the next patch wants to put codes into
the function rdev_addable
>
> > -               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
> >

Reviewed-by: Xiao Ni <xni@...hat.com>