Re: [Update PATCH V3] md: don't unregister sync_thread with reconfig_mutex held

[Wols Lists <antlists@youngman.org.uk>]

On 09/05/2022 11:37, Guoqing Jiang wrote:
> 
> 
> On 5/9/22 5:32 PM, Wols Lists wrote:
>> On 09/05/2022 09:09, Guoqing Jiang wrote:
>>> I can switch back to V2 if you think that is the correct way to do 
>>> though no
>>> one comment about the change in dm-raid.
>>
>> DON'T QUOTE ME ON THIS
>>
>> but it is very confusing, as I believe dm-raid is part of Device 
>> Managment, which is actually nothing to do with md-raid
> 
> 
> No, dm-raid (I mean dm-raid.c here) is a bridge between dm framwork and 
> md raid, which
> makes dm can reuse md raid code to avoid re-implementation raid logic 
> inside dm itself.

Hmm...

Which backs up what I thought - if it's used by the dm people to call 
md-raid, then asking for info/comments about it on the md list is likely 
to get you no-where...

>> (apart from, like many block layer drivers, md-raid uses dm to manage 
>> the device beneath it.)
> 
> The above statement is very confusing.
> 
Yup. I've never understood it. But, from all my time on the list, it is 
noticeable that nobody seems to know or care much about dm, and this is 
simply one more data point that agrees with that impression. If you want 
to know about dm-raid, you probably need to go where the dm people hang out.

Cheers,
Wol