linux-kernel - Re: [PATCH -next v2 2/7] md: factor out a helper to choose sync direction from md_check

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Date:   Thu, 17 Aug 2023 09:58:14 +0200
From:   Mariusz Tkaczyk <mariusz.tkaczyk@...ux.intel.com>
To:     Yu Kuai <yukuai1@...weicloud.com>
Cc:     xni@...hat.com, song@...nel.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 v2 2/7] md: factor out a helper to choose sync
 direction from md_check_recovery()

On Tue, 15 Aug 2023 11:09:52 +0800
Yu Kuai <yukuai1@...weicloud.com> wrote:

> From: Yu Kuai <yukuai3@...wei.com>
> 
> There are no functional changes, on the one hand make the code cleaner,
> on the other hand prevent following checkpatch error in the next patch to
> delay choosing sync direction to md_start_sync().
> 
> ERROR: do not use assignment in if condition
> +       } else if ((spares = remove_and_add_spares(mddev, NULL))) {
> 
> Signed-off-by: Yu Kuai <yukuai3@...wei.com>
> ---
>  drivers/md/md.c | 68 +++++++++++++++++++++++++++++++------------------
>  1 file changed, 43 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/md/md.c b/drivers/md/md.c
> index 90815be1e80f..4846ff6d25b0 100644
> --- a/drivers/md/md.c
> +++ b/drivers/md/md.c
> @@ -9246,6 +9246,48 @@ static int remove_and_add_spares(struct mddev *mddev,
>  	return spares;
>  }
>  
> +static bool md_choose_sync_direction(struct mddev *mddev, int *spares)

The naming is little confusing because as a direction I would expect forward or
backward - from end to start or or from start to end. In this case you are
determining the type of the background operation needed. Assuming that reshape
is a kind of "sync" operation I would say "md_choose_sync_action".

Anyway, it looks good to me.

Thanks,
Mariusz