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:   Sun, 20 Aug 2023 09:44:13 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     Song Liu <song@...nel.org>,
        Mariusz Tkaczyk <mariusz.tkaczyk@...ux.intel.com>
Cc:     Yu Kuai <yukuai1@...weicloud.com>, xni@...hat.com,
        linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
        yi.zhang@...wei.com, yangerkun@...wei.com,
        "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH -next v2 2/7] md: factor out a helper to choose sync
 direction from md_check_recovery()

Hi,

在 2023/08/18 5:49, Song Liu 写道:
> On Thu, Aug 17, 2023 at 12:58 AM Mariusz Tkaczyk
> <mariusz.tkaczyk@...ux.intel.com> wrote:
>>
>> 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".
> 
> Yeah, md_choose_sync_direction is indeed confusing.
> 

Thanks for the suggestion, I'll update this in the new version.

Kuai,

> Thanks,
> Song
> .
>