Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.37 as permitted sender) client-ip=23.128.96.37;
Subject: Re: [PATCH v2 1/6] md: fix missing flush of sync_work
To:     Song Liu <song@kernel.org>, Yu Kuai <yukuai1@huaweicloud.com>
Cc:     xni@redhat.com, linux-kernel@vger.kernel.org,
        linux-raid@vger.kernel.org, yi.zhang@huawei.com,
        yangerkun@huawei.com, "yukuai (C)" <yukuai3@huawei.com>
References: <20231124075953.1932764-1-yukuai1@huaweicloud.com>
 <20231124075953.1932764-2-yukuai1@huaweicloud.com>
 <CAPhsuW5mjvpMmEN5g_-ADQgJKZ1=QyNxxSw-7kq-W2jww09Aag@mail.gmail.com>
From:   Yu Kuai <yukuai1@huaweicloud.com>
Message-ID: <e3b8298c-1154-c5ce-d025-b9346a6cd2ab@huaweicloud.com>
Date:   Tue, 28 Nov 2023 10:07:08 +0800
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101
 Thunderbird/60.8.0
MIME-Version: 1.0
In-Reply-To: <CAPhsuW5mjvpMmEN5g_-ADQgJKZ1=QyNxxSw-7kq-W2jww09Aag@mail.gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
Precedence: bulk

Hi,

在 2023/11/28 8:02, Song Liu 写道:
> On Fri, Nov 24, 2023 at 12:00 AM Yu Kuai <yukuai1@huaweicloud.com> wrote:
>>
>> From: Yu Kuai <yukuai3@huawei.com>
>>
>> Commit ac619781967b ("md: use separate work_struct for md_start_sync()")
>> use a new sync_work to replace del_work, however, stop_sync_thread() and
>> __md_stop_writes() was trying to wait for sync_thread to be done, hence
>> they should switch to use sync_work as well.
>>
>> Noted that md_start_sync() from sync_work will grab 'reconfig_mutex',
>> hence other contex can't held the same lock to flush work, and this will
>> be fixed in later patches.
>>
>> Fixes: ac619781967b ("md: use separate work_struct for md_start_sync()")
> 
> This fix should go via md-fixes branch. Please send it separately.

This patch alone is not good, there are follow up problems to be fixed
completely after patch 5. Can this patchset applied to md-fixes?

Or I can split patch 1,4 and 5 for md-fixes, and keep others to md-next.

Thanks,
Kuai

> 
> Thanks,
> Song
> 
>> Signed-off-by: Yu Kuai <yukuai3@huawei.com>
>> ---
>>   drivers/md/md.c | 4 ++--
>>   1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/md/md.c b/drivers/md/md.c
>> index 09686d8db983..1701e2fb219f 100644
>> --- a/drivers/md/md.c
>> +++ b/drivers/md/md.c
>> @@ -4865,7 +4865,7 @@ static void stop_sync_thread(struct mddev *mddev)
>>                  return;
>>          }
>>
>> -       if (work_pending(&mddev->del_work))
>> +       if (work_pending(&mddev->sync_work))
>>                  flush_workqueue(md_misc_wq);
>>
>>          set_bit(MD_RECOVERY_INTR, &mddev->recovery);
>> @@ -6273,7 +6273,7 @@ static void md_clean(struct mddev *mddev)
>>   static void __md_stop_writes(struct mddev *mddev)
>>   {
>>          set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
>> -       if (work_pending(&mddev->del_work))
>> +       if (work_pending(&mddev->sync_work))
>>                  flush_workqueue(md_misc_wq);
>>          if (mddev->sync_thread) {
>>                  set_bit(MD_RECOVERY_INTR, &mddev->recovery);
>> --
>> 2.39.2
>>
> .
>