linux-kernel - Re: [PATCH v2 1/3] md: Don't clear MD_CLOSING when the raid is about to stop

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Date: Mon, 22 Jan 2024 10:14:13 +0800
From: Li Nan <linan666@...weicloud.com>
To: Mariusz Tkaczyk <mariusz.tkaczyk@...ux.intel.com>,
 linan666@...weicloud.com
Cc: song@...nel.org, shli@...com, neilb@...e.com, zlliu@...e.com,
 linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
 yukuai3@...wei.com, yi.zhang@...wei.com, houtao1@...wei.com,
 yangerkun@...wei.com
Subject: Re: [PATCH v2 1/3] md: Don't clear MD_CLOSING when the raid is about
 to stop



在 2024/1/18 15:35, Mariusz Tkaczyk 写道:
> On Wed, 17 Jan 2024 17:37:05 +0800
> linan666@...weicloud.com wrote:
> 
>> From: Li Nan <linan122@...wei.com>
>>
>> The raid should not be opened anymore when it is about to be stopped.
>> However, other processes can open it again if the flag MD_CLOSING is
>> cleared before exiting. From now on, this flag will not be cleared when
>> the raid will be stopped.
>>
>> Fixes: 065e519e71b2 ("md: MD_CLOSING needs to be cleared after called
>> md_set_readonly or do_md_stop") Signed-off-by: Li Nan <linan122@...wei.com>
>> ---
>>   drivers/md/md.c | 16 +++++++++++++++-
>>   1 file changed, 15 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/md/md.c b/drivers/md/md.c
>> index 9bdd57324c37..4bf821b89415 100644
>> --- a/drivers/md/md.c
>> +++ b/drivers/md/md.c
>> @@ -6254,7 +6254,15 @@ static void md_clean(struct mddev *mddev)
>>   	mddev->persistent = 0;
>>   	mddev->level = LEVEL_NONE;
>>   	mddev->clevel[0] = 0;
>> -	mddev->flags = 0;
>> +	/*
>> +	 * Don't clear MD_CLOSING, or mddev can be opened again.
>> +	 * 'hold_active != 0' means mddev is still in the creation
>> +	 * process and will be used later.
>> +	 */
>> +	if (mddev->hold_active)
>> +		mddev->flags = 0;
>> +	else
>> +		mddev->flags &= BIT_ULL_MASK(MD_CLOSING);
>>   	mddev->sb_flags = 0;
>>   	mddev->ro = MD_RDWR;
>>   	mddev->metadata_type[0] = 0;
>> @@ -7728,6 +7736,12 @@ static int md_ioctl(struct block_device *bdev,
>> blk_mode_t mode,
>>   	case STOP_ARRAY:
>>   		err = do_md_stop(mddev, 0, bdev);
>> +		if (!err)
>> +			/*
>> +			 * mddev has been stopped, keep flag the
>> +			 * MD_CLOSING to prevent reuse.
>> +			 */
>> +			did_set_md_closing = false;
> 
> Hello Nan,
> The meaning of the "did_set_md_closing" is to notify that MD_CLOSING was set in
> this function, to know how to behave on error.
> You gave it another meaning "Do not clear MD_CLOSING because we want it to stay"
> Please consider how to solve this confusion. I see the comment you added but I
> think we can have this solved better, maybe just name it as "clear_md_closing"?
> 

Thanks for your review, I will rename it in next version.

> Anyway it looks acceptable to me:
> Acked-by: Mariusz Tkaczyk <mariusz.tkaczyk@...ux.intel.com>
> 
> Thanks,
> Mariusz
> 
> .

-- 
Thanks,
Nan