Re: [bug report] raid0 array mkfs.xfs hang

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On Wed, Aug 14, 2024 at 06:25:39PM +0100, John Garry wrote:
> On 14/08/2024 15:52, Martin K. Petersen wrote:
>>
>> Keith,
>>
>>> Your change looks fine, though it sounds odd that md raid is changing
>>> queue_limit values outside the limits_lock. The stacking limits should
>>> have set the md device to 0 if one of the member drives doesn't
>>> support write_zeroes, right?
>>
>
> And even if we had used the limits lock to synchronize the update, that 
> only synchronizes writers but not readers (of the limits).

Readers are blocked by freezing the queues (for most drivers) or
doing the internal mddev suspend for md.

So I suspect kicking off a workqueue to do the limits update will
be the right thing going ahead.  For now we'll just need to hack
around by doing single reads of the field.




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