linux-kernel - Re: [PATCH v2 1/6] md: fix missing flush of sync

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Date:   Tue, 28 Nov 2023 10:07:08 +0800
From:   Yu Kuai <yukuai1@...weicloud.com>
To:     Song Liu <song@...nel.org>, Yu Kuai <yukuai1@...weicloud.com>
Cc:     xni@...hat.com, linux-kernel@...r.kernel.org,
        linux-raid@...r.kernel.org, yi.zhang@...wei.com,
        yangerkun@...wei.com, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH v2 1/6] md: fix missing flush of sync_work

Hi,

在 2023/11/28 8:02, Song Liu 写道:
> On Fri, Nov 24, 2023 at 12:00 AM Yu Kuai <yukuai1@...weicloud.com> wrote:
>>
>> From: Yu Kuai <yukuai3@...wei.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@...wei.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
>>
> .
>